JP4848665B2 - Compressor - Google Patents

Description

  The present invention relates to a compressor used in, for example, an air conditioner or a refrigerator.

  2. Description of the Related Art Conventionally, a compressor includes an axial gap type motor arranged in a vertical direction in an airtight container and a compression unit driven by the motor (Japanese Patent Laid-Open No. 61-185040). Patent Document 1).

  The motor includes a stator, a rotor disposed on both sides in the axial direction of the stator via an air gap, and a shaft that is fixed to the rotor and transmits the rotational force of the rotor to the compression unit. Yes. Then, the refrigerant mainly flows through the passage on the outer peripheral side of the motor and the air gap.

  However, in the conventional compressor, since the passage on the outer peripheral side of the motor and the air gap are narrow refrigerant passages, the refrigerant flows through the narrow refrigerant passage, and the upstream side of the motor And the pressure difference between the downstream side increases and the pressure loss of the compressor increases.

The lubricating oil contained in the refrigerant is blown to the outer peripheral side of the motor by an oil separator. Since the outer peripheral side of the motor is the refrigerant passage, the lubricating oil is supplied from the outer peripheral side of the motor. The refrigerant flows to the downstream side of the motor. For this reason, it becomes difficult to separate the lubricating oil from the refrigerant.
Japanese Patent Laid-Open No. 61-185040

  Therefore, an object of the present invention is to provide a compressor capable of separating oil while reducing pressure loss.

In order to solve the above problems, the compressor of the present invention is:
A sealed container;
An axial gap type motor having an inner passage that communicates with the air gap and an outer passage on the outer peripheral side, as well as being disposed in the sealed container,
A compression unit disposed in the sealed container and driven by the motor ;
The motor includes a shaft, a stator and a rotor that are disposed along the shaft and face each other in the axial direction of the shaft,
The air gap exists between the stator and the rotor,
The inner passage is
The inner periphery of the stator or the inside of the shaft inside the stator;
The inner periphery of the rotor, or the inside of the shaft inside the rotor;
Formed into
The outer passage is
It is located radially outside the shaft from the inner passage
A gap between the outer periphery of the stator and the sealed container, or the outer periphery of the stator,
It is formed in the clearance gap between the outer peripheral part of the said rotor, and the said airtight container .

  According to the compressor of the present invention, since the motor has the inner passage, the refrigerant mainly flows through the inner passage in addition to the conventional outer peripheral passage of the motor. For this reason, the differential pressure between the upstream side and the downstream side of the motor can be reduced, and the pressure loss of the compressor can be reduced. Further, the lubricating oil is blown to the outer peripheral side of the motor by the centrifugal force of the motor, and is difficult to be guided to the inner passage, so that the lubricating oil can be separated from the refrigerant.

The compressor of the present invention is
The motor
A stator and a rotor arranged in order from upstream to downstream in the direction in which the refrigerant gas flows;
A shaft which is fixed to the rotor and transmits the rotational force of the rotor to the compression unit, or is extended from the rotor and held by a bearing, or has a shaft having at least one function,
There is an air gap between the stator and the rotor,
The stator has a stator inner passage that spirally penetrates along or around the axis of the shaft in or near the shaft,
The rotor has a rotor inner passage penetrating along the axis of the shaft in the vicinity of the shaft,
The opening area on the air gap side of the rotor inner passage is:
More than the virtual air gap area which is the area of the portion in the air gap of the virtual cylindrical surface concentric with the shaft and circumscribed to the opening on the air gap side of the stator inner passage.
It is small.

  When the stator inner passage has a plurality of holes, the virtual cylindrical surface may include all the holes and circumscribe at least one of the holes. When the rotor inner passage has a plurality of holes, the air gap side opening area of the rotor inner passage is the opening area of all the holes.

  According to the compressor of the present invention, since the stator inner passage and the rotor inner passage are provided, the refrigerant mainly includes the stator inner passage and the rotor inner passage in addition to the conventional passage on the outer peripheral side of the motor. Flow through the passage. For this reason, the differential pressure between the upstream side and the downstream side of the motor can be reduced, and the pressure loss of the compressor can be reduced.

  Moreover, since the opening area of the rotor inner passage is smaller than the virtual air gap area, the lubricating oil is more likely to flow to the air gap side than the rotor inner passage. Furthermore, the lubricating oil adheres to the rotor in the form of fine particles, is blown to the outer peripheral side of the rotor by the centrifugal force of the rotor, is struck by the sealed container, and is liquefied. In this way, the lubricating oil can be reliably separated from the refrigerant.

In the compressor of one embodiment,
The motor
A stator and a rotor arranged in order from upstream to downstream in the direction in which the refrigerant gas flows;
A shaft which is fixed to the rotor and transmits the rotational force of the rotor to the compression unit, or is extended from the rotor and held by a bearing, or has a shaft having at least one function,
There is an air gap between the stator and the rotor,
The stator has a stator inner passage that spirally penetrates along or around the axis of the shaft in or near the shaft,
The rotor has a rotor inner passage penetrating along the axis of the shaft in the vicinity of the shaft,
A virtual circumscribed circle on the stator side that circumscribes the opening on the air gap side of the stator inner passage and is concentric with the shaft is:
Than the rotor side virtual circumscribed circle that circumscribes the opening on the air gap side of the rotor inner passage and is concentric with the shaft,
large.

  The stator side virtual inscribed circle inscribed in the air gap side opening of the stator inner passage and concentric with the shaft circumscribes the air gap side opening in the rotor inner passage and is concentric with the shaft. It is more preferable to make it larger than the rotor side virtual circumscribed circle. The lubricating oil rising through the stator inner passage hits the rotor once and adheres to the rotor because the rotor inner passage does not exist linearly with respect to the stator inner passage, and due to the centrifugal force of the rotor, Since it will be blown to the outer peripheral side, the amount of lubricating oil passing through the rotor inner passage can be further reduced.

  When the stator inner passage has a plurality of holes, the stator-side virtual circumcircle may include all the holes and circumscribe at least one of the holes. When the rotor inner passage has a plurality of holes, the rotor-side virtual circumcircle may include all the holes and circumscribe at least one of the holes.

  According to the compressor of this embodiment, the stator-side virtual circumcircle is larger than the rotor-side virtual circumcircle, so that the lubricating oil from the stator inner passage can be applied to and adhere to the rotor. And the said lubricating oil can be blown to the outer peripheral side of the said rotor with the centrifugal force of the said rotor.

  Since the stator inner passage and the rotor inner passage are provided, the refrigerant mainly flows through the stator inner passage and the rotor inner passage in addition to the conventional outer peripheral passage of the motor. For this reason, the differential pressure between the upstream side and the downstream side of the motor can be reduced, and the pressure loss of the compressor can be reduced.

In the compressor of one embodiment,
The motor
A stator and a rotor arranged in order from upstream to downstream in the direction in which the refrigerant gas flows;
A shaft which is fixed to the rotor and transmits the rotational force of the rotor to the compression unit, or is extended from the rotor and held by a bearing, or has a shaft having at least one function,
There is an air gap between the stator and the rotor,
The stator has a stator inner passage that spirally penetrates along or around the axis of the shaft in or near the shaft,
The rotor has a rotor inner passage penetrating along the axis of the shaft in the vicinity of the shaft,
The rotor has a permanent magnet,
The permanent magnet has an inter-magnet passage that communicates with the stator inner passage and the rotor inner passage through the air gap and extends in the radial direction and opens to the outer periphery.

  The term “communication” used herein refers to a state in which refrigerant and lubricating oil can sequentially pass through the respective passages. That is, there is clearly nothing between them in which refrigerant and lubricating oil are disturbed. For example, the entrance of the passage is not blocked by iron or resin.

  According to the compressor of this embodiment, since the permanent magnet of the rotor has the passage between magnets, the passage between magnets can be used as a passage for lubricating oil and refrigerant. As a result, the passage cross-sectional areas of the lubricating oil and the refrigerant passing through the air gap can be enlarged, so that the differential pressure between the upstream side and the downstream side of the motor can be further reduced, and the pressure loss of the compressor can be further reduced.

  Since the stator inner passage and the rotor inner passage are provided, the refrigerant mainly flows through the stator inner passage and the rotor inner passage in addition to the conventional outer peripheral passage of the motor. For this reason, the differential pressure between the upstream side and the downstream side of the motor can be reduced, and the pressure loss of the compressor can be reduced.

In the compressor of one embodiment,
The motor
A stator and a rotor arranged in order from upstream to downstream in the direction in which the refrigerant gas flows;
A shaft which is fixed to the rotor and transmits the rotational force of the rotor to the compression unit, or is extended from the rotor and held by a bearing, or has a shaft having at least one function,
There is an air gap between the stator and the rotor,
The stator is
A stator inner passage that spirals through or around the axis of the shaft, in or near the shaft;
A stator outer passage provided on the closed container side,
The rotor is
In the vicinity of the shaft, a rotor inner passage penetrating along the axis of the shaft;
A rotor outer passage provided on the closed container side,
The opening area on the air gap side of the rotor outer passage is smaller than the opening area on the air gap side of the stator outer passage.

  Here, the stator outer passage includes a clearance between the stator and the sealed container, and a through hole provided in the axial direction in the vicinity of the outer periphery of the stator, and only one of them may be provided. . For example, the through hole is provided on the outer peripheral side of the coil, and a thin portion with a very small width is provided between the through hole and the outer periphery of the stator. Similarly, the rotor outer passage includes a gap between the rotor and the hermetic container, and a through hole provided in the axial direction near the outer periphery of the rotor, and is provided in the axial direction near the outer periphery of the rotor. Only the provided through holes may be provided.

  According to the compressor of this embodiment, since the opening area on the air gap side of the rotor outer passage is smaller than the opening area on the air gap side of the stator outer passage, the lubricating oil is supplied to the outer side of the rotor. The lubricant can be guided to the stator outer passage rather than the passage, and the lubricating oil can be reliably guided to the upstream side of the motor.

  Since the stator inner passage and the rotor inner passage are provided, the refrigerant mainly flows through the stator inner passage and the rotor inner passage in addition to the conventional outer peripheral passage of the motor. For this reason, the differential pressure between the upstream side and the downstream side of the motor can be reduced, and the pressure loss of the compressor can be reduced.

In the compressor of one embodiment,
The motor
A stator and a rotor arranged in order from upstream to downstream in the direction in which the refrigerant gas flows;
A shaft which is fixed to the rotor and transmits the rotational force of the rotor to the compression unit, or is extended from the rotor and held by a bearing, or has a shaft having at least one function,
There is an air gap between the stator and the rotor,
The stator has a stator inner passage that spirally penetrates along or around the axis of the shaft in or near the shaft,
The rotor has a rotor inner passage penetrating along the axis of the shaft in the vicinity of the shaft,
The facing surface of the rotor facing the stator and the facing surface of the stator facing the rotor are substantially circular,
The outer diameter of the facing surface of the rotor facing the stator is larger than the outer diameter of the facing surface of the stator facing the rotor.

  According to the compressor of this embodiment, the outer diameter of the opposing surface of the rotor is larger than the outer diameter of the opposing surface of the stator at the opposing surfaces of the rotor and the stator. Since the gap between the rotor and the sealed container can be guided to the gap between the stator and the sealed container, the lubricating oil can be reliably guided to the upstream side of the motor.

  Since the stator inner passage and the rotor inner passage are provided, the refrigerant mainly flows through the stator inner passage and the rotor inner passage in addition to the conventional outer peripheral passage of the motor. For this reason, the differential pressure between the upstream side and the downstream side of the motor can be reduced, and the pressure loss of the compressor can be reduced.

In the compressor of one embodiment,
The motor
A stator and a rotor arranged in order from upstream to downstream in the direction in which the refrigerant gas flows;
A shaft which is fixed to the rotor and transmits the rotational force of the rotor to the compression unit, or is extended from the rotor and held by a bearing, or has a shaft having at least one function,
There is an air gap between the stator and the rotor,
The stator is
A stator inner passage that spirals through or around the axis of the shaft, in or near the shaft;
A stator outer passage provided on the closed container side,
The rotor has a rotor inner passage penetrating along the axis of the shaft in the vicinity of the shaft,
The opening area of the stator outer passage on the air gap side is larger than the opening area of the stator inner passage on the air gap side.

  According to the compressor of this embodiment, since the air gap functions as a so-called centrifugal pump, the pressure on the outer diameter side (stator outer passage) is usually higher than the inner diameter side (stator inner passage). Therefore, by enlarging the stator outer passage, the lubricating oil can be effectively returned to the upstream (lower) space of the motor. Further, the area of the refrigerant passage can be effectively increased without sacrificing the magnetic path of the motor at the large diameter portion, and there is an effect that oil rise prevention and differential pressure and pressure loss reduction are realized.

  Since the stator inner passage and the rotor inner passage are provided, the refrigerant mainly flows through the stator inner passage and the rotor inner passage in addition to the conventional outer peripheral passage of the motor. For this reason, the differential pressure between the upstream side and the downstream side of the motor can be reduced, and the pressure loss of the compressor can be reduced.

In the compressor of one embodiment,
The motor
A stator and a rotor arranged in order from upstream to downstream in the direction in which the refrigerant gas flows;
A shaft which is fixed to the rotor and transmits the rotational force of the rotor to the compression unit, or is extended from the rotor and held by a bearing, or has a shaft having at least one function,
There is an air gap between the stator and the rotor,
The stator has a stator inner passage that spirally penetrates along or around the axis of the shaft in or near the shaft,
The rotor is
In the vicinity of the shaft, a rotor inner passage penetrating along the axis of the shaft;
A rotor outer passage provided on the closed container side,
The opening area of the rotor outer passage opposite to the air gap is larger than the opening area of the rotor inner passage opposite to the air gap.

  According to the compressor of this embodiment, the lubricating oil that has flowed into the downstream (upper) space of the motor can be effectively returned through the rotor inner passage. Further, the area of the refrigerant passage can be effectively increased without sacrificing the magnetic path of the motor at the large diameter portion, and there is an effect that oil rise prevention and differential pressure and pressure loss reduction are realized.

  Since the stator inner passage and the rotor inner passage are provided, the refrigerant mainly flows through the stator inner passage and the rotor inner passage in addition to the conventional outer peripheral passage of the motor. For this reason, the differential pressure between the upstream side and the downstream side of the motor can be reduced, and the pressure loss of the compressor can be reduced.

The compressor of the present invention is
The motor
A rotor and a stator arranged in order from the upstream to the downstream in the direction in which the refrigerant gas flows;
A shaft which is fixed to the rotor and transmits the rotational force of the rotor to the compression unit, or is extended from the rotor and held by a bearing, or has a shaft having at least one function,
There is an air gap between the stator and the rotor,
The rotor has a rotor inner passage that spirally penetrates along or around the axis of the shaft in or near the shaft,
The stator has a stator inner passage that penetrates along the axis of the shaft in the vicinity of the shaft,
The opening area of the stator inner passage on the air gap side is:
Than the virtual air gap area which is the area of the portion inside the air gap of the virtual cylindrical surface concentric with the shaft and circumscribed to the opening on the air gap side of the rotor inner passage,
It is small.

  In the case where a bearing is provided in the stator and it is necessary to supply lubricating oil to the bearing, a means for supplying lubricating oil to the bearing in the stator may be provided separately, or the stator inner passage may also be used. .

  When the rotor inner passage has a plurality of holes, the virtual cylindrical surface may include all the holes and circumscribe at least one of the holes. When the stator inner passage has a plurality of holes, the air gap side opening area of the stator inner passage is an opening area of all the holes.

  According to the compressor of the present invention, since the stator inner passage and the rotor inner passage are provided, the refrigerant mainly includes the stator inner passage and the rotor inner passage in addition to the conventional passage on the outer peripheral side of the motor. Flow through the passage. For this reason, the differential pressure between the upstream side and the downstream side of the motor can be reduced, and the pressure loss of the compressor can be reduced.

  In addition, since the opening area of the stator inner passage is smaller than the virtual air gap area, the lubricating oil flows more easily to the air gap side than the stator inner passage. Furthermore, the lubricating oil adheres to the rotor in the form of fine particles, is blown to the outer peripheral side of the rotor by the centrifugal force of the rotor, is struck by the sealed container, and is liquefied. In this way, the lubricating oil can be reliably separated from the refrigerant.

In the compressor of one embodiment,
The motor
A rotor and a stator arranged in order from the upstream to the downstream in the direction in which the refrigerant gas flows;
A shaft which is fixed to the rotor and transmits the rotational force of the rotor to the compression unit, or is extended from the rotor and held by a bearing, or has a shaft having at least one function,
There is an air gap between the stator and the rotor,
The rotor has a rotor inner passage that spirally penetrates along or around the axis of the shaft in or near the shaft,
The stator has a stator inner passage that penetrates along the axis of the shaft in the vicinity of the shaft,
The rotor side virtual circumscribed circle that circumscribes the air gap side opening of the rotor inner passage and is concentric with the shaft is:
Than the stator side virtual circumscribed circle circumscribing the air gap side opening of the stator inner passage and concentric with the shaft,
large.

  The rotor side virtual inscribed circle inscribed in the air gap side opening of the rotor inner passage and concentric with the shaft circumscribes the air gap side opening in the stator inner passage and is concentric with the shaft. It is more preferable to make it larger than the stator side virtual circumscribed circle.

  When the rotor inner passage has a plurality of holes, the rotor-side virtual circumcircle may include all the holes and circumscribe at least one of the holes. Further, when the stator inner passage has a plurality of holes, the stator side virtual circumscribed circle only needs to include all the holes and circumscribe at least one of the holes.

  According to the compressor of this one embodiment, the rotor-side virtual circumcircle is larger than the stator-side virtual circumcircle, so that the lubricating oil from the rotor inner passage is applied to the stator and reflected. , Can adhere to the rotor. And the said lubricating oil can be blown to the outer peripheral side of the said rotor with the centrifugal force of the said rotor.

  Since the stator inner passage and the rotor inner passage are provided, the refrigerant mainly flows through the stator inner passage and the rotor inner passage in addition to the conventional outer peripheral passage of the motor. For this reason, the differential pressure between the upstream side and the downstream side of the motor can be reduced, and the pressure loss of the compressor can be reduced.

In the compressor of one embodiment,
The motor
A rotor and a stator arranged in order from the upstream to the downstream in the direction in which the refrigerant gas flows;
A shaft which is fixed to the rotor and transmits the rotational force of the rotor to the compression unit, or is extended from the rotor and held by a bearing, or has a shaft having at least one function,
There is an air gap between the stator and the rotor,
The rotor has a rotor inner passage that spirally penetrates along or around the axis of the shaft in or near the shaft,
The stator has a stator inner passage that penetrates along the axis of the shaft in the vicinity of the shaft,
The rotor has a permanent magnet,
The permanent magnet has an inter-magnet passage that communicates with the stator inner passage and the rotor inner passage through the air gap and extends in the radial direction and opens to the outer periphery.

  According to the compressor of this embodiment, since the permanent magnet of the rotor has the passage between magnets, the passage between magnets can be used as a passage for the lubricating oil and refrigerant. As a result, the cross-sectional area of the lubricating oil and refrigerant passing through the air gap can be increased, so that the lubricating oil can be blown to the outer peripheral side of the rotor by the centrifugal force of the rotor.

  Since the stator inner passage and the rotor inner passage are provided, the refrigerant mainly flows through the stator inner passage and the rotor inner passage in addition to the conventional outer peripheral passage of the motor. For this reason, the differential pressure between the upstream side and the downstream side of the motor can be reduced, and the pressure loss of the compressor can be reduced.

In the compressor of one embodiment,
The motor
A rotor and a stator arranged in order from the upstream to the downstream in the direction in which the refrigerant gas flows;
A shaft which is fixed to the rotor and transmits the rotational force of the rotor to the compression unit, or is extended from the rotor and held by a bearing, or has a shaft having at least one function,
There is an air gap between the stator and the rotor,
The rotor is
A rotor inner passage that spirals through or around the axis of the shaft in or near the shaft;
A rotor outer passage provided on the closed container side,
The stator is
In the vicinity of the shaft, a stator inner passage penetrating along the axis of the shaft;
A stator outer passage provided on the closed container side,
The opening area of the stator outer passage on the air gap side is smaller than the opening area of the rotor outer passage on the air gap side.

  Here, the stator outer passage includes a clearance between the stator and the sealed container, and a through hole provided in the axial direction in the vicinity of the outer periphery of the stator, and only one of them may be provided. . For example, the through hole is provided on the outer peripheral side of the coil, and a thin portion with a very small width is provided between the through hole and the outer periphery of the stator. Similarly, the rotor outer passage includes a gap between the rotor and the hermetic container, and a through hole provided in the axial direction near the outer periphery of the rotor, and is provided in the axial direction near the outer periphery of the rotor. Only the provided through holes may be provided.

  According to the compressor of this embodiment, since the opening area on the air gap side of the stator outer passage is smaller than the opening area on the air gap side of the rotor outer passage, the lubricating oil is supplied to the outer side of the stator. The lubricant can be guided to the rotor outer passage rather than the passage, and the lubricating oil can be reliably guided to the upstream side of the motor.

  Since the stator inner passage and the rotor inner passage are provided, the refrigerant mainly flows through the stator inner passage and the rotor inner passage in addition to the conventional outer peripheral passage of the motor. For this reason, the differential pressure between the upstream side and the downstream side of the motor can be reduced, and the pressure loss of the compressor can be reduced.

In the compressor of one embodiment,
The motor
A rotor and a stator arranged in order from the upstream to the downstream in the direction in which the refrigerant gas flows;
A shaft which is fixed to the rotor and transmits the rotational force of the rotor to the compression unit, or is extended from the rotor and held by a bearing, or has a shaft having at least one function,
There is an air gap between the stator and the rotor,
The rotor has a rotor inner passage that spirally penetrates along or around the axis of the shaft in or near the shaft,
The stator has a stator inner passage that penetrates along the axis of the shaft in the vicinity of the shaft,
The facing surface of the rotor facing the stator and the facing surface of the stator facing the rotor are substantially circular,
The outer diameter of the facing surface of the stator facing the rotor is larger than the outer diameter of the facing surface of the rotor facing the stator.

  According to the compressor of this embodiment, the outer diameter of the opposing surface of the stator is larger than the outer diameter of the opposing surface of the rotor at the opposing surfaces of the rotor and the stator. Further, it can be guided to the gap between the rotor and the sealed container rather than the gap between the stator and the sealed container, and the lubricating oil can be reliably guided to the upstream side of the motor.

  Since the stator inner passage and the rotor inner passage are provided, the refrigerant mainly flows through the stator inner passage and the rotor inner passage in addition to the conventional outer peripheral passage of the motor. For this reason, the differential pressure between the upstream side and the downstream side of the motor can be reduced, and the pressure loss of the compressor can be reduced.

In the compressor of one embodiment,
The motor
A rotor and a stator arranged in order from the upstream to the downstream in the direction in which the refrigerant gas flows;
A shaft which is fixed to the rotor and transmits the rotational force of the rotor to the compression unit, or is extended from the rotor and held by a bearing, or has a shaft having at least one function,
There is an air gap between the stator and the rotor,
The rotor is
A rotor inner passage that spirals through or around the axis of the shaft in or near the shaft;
A rotor outer passage provided on the closed container side,
The stator has a stator inner passage that penetrates along the axis of the shaft in the vicinity of the shaft,
The opening area of the rotor outer passage on the air gap side is larger than the opening area of the rotor inner passage on the air gap side.

  According to the compressor of this embodiment, since the air gap functions as a so-called centrifugal pump, the pressure on the outer diameter side (rotor outer passage) is usually higher than the inner diameter side (rotor inner passage). Therefore, by enlarging the rotor outer passage, the lubricating oil can be effectively returned to the upstream (lower) space of the motor. Further, the area of the refrigerant passage can be effectively increased without sacrificing the magnetic path of the motor at the large diameter portion, and there is an effect that oil rise prevention and differential pressure and pressure loss reduction are realized.

  Since the stator inner passage and the rotor inner passage are provided, the refrigerant mainly flows through the stator inner passage and the rotor inner passage in addition to the conventional outer peripheral passage of the motor. For this reason, the differential pressure between the upstream side and the downstream side of the motor can be reduced, and the pressure loss of the compressor can be reduced.

In the compressor of one embodiment,
The motor
A rotor and a stator arranged in order from the upstream to the downstream in the direction in which the refrigerant gas flows;
A shaft which is fixed to the rotor and transmits the rotational force of the rotor to the compression unit, or is extended from the rotor and held by a bearing, or has a shaft having at least one function,
There is an air gap between the stator and the rotor,
The rotor has a rotor inner passage that spirally penetrates along or around the axis of the shaft in or near the shaft,
The stator is
In the vicinity of the shaft, a stator inner passage penetrating along the axis of the shaft;
A stator outer passage provided on the closed container side,
The opening area of the stator outer passage opposite to the air gap is larger than the opening area of the stator inner passage opposite to the air gap.

  According to the compressor of this embodiment, the lubricating oil that has flowed into the downstream (upper) space of the motor can be effectively returned through the stator inner passage. Further, the area of the refrigerant passage can be effectively increased without sacrificing the magnetic path of the motor at the large diameter portion, and there is an effect that oil rise prevention and differential pressure and pressure loss reduction are realized.

  Since the stator inner passage and the rotor inner passage are provided, the refrigerant mainly flows through the stator inner passage and the rotor inner passage in addition to the conventional outer peripheral passage of the motor. For this reason, the differential pressure between the upstream side and the downstream side of the motor can be reduced, and the pressure loss of the compressor can be reduced.

The compressor of the present invention is
The motor
A first rotor, a stator and a second rotor arranged in order from upstream to downstream in the direction in which the refrigerant gas flows;
The first rotor and the second rotor are fixed to the first rotor and the second rotor, and the rotational force of the first rotor and the second rotor is transmitted to the compression section, or the first rotor and the second rotor A shaft that extends from the shaft and is held by the bearing or has at least one function.
There is a first air gap between the stator and the first rotor,
Between the stator and the second rotor, there is a second air gap,
The first rotor has a first rotor inner passage that penetrates along the axis of the shaft in the vicinity of the shaft,
The stator has, in the vicinity of the shaft, a stator inner passage that spirally penetrates along or around the axis of the shaft.
The second rotor has a second rotor inner passage that penetrates along the axis of the shaft in the vicinity of the shaft,
The opening area of the stator inner passage on the first air gap side is:
The area of the portion of the first virtual cylindrical surface that circumscribes the opening on the first air gap side of the first rotor inner passage and that is concentric with the shaft is in the first air gap. Than the virtual air gap area of
Small,
Or
The opening area of the second rotor inner passage on the second air gap side is:
The second virtual air that is the area of the portion of the second virtual cylindrical surface that circumscribes the opening on the second air gap side of the stator inner passage and is concentric with the shaft is in the second air gap. Than the gap area
It is characterized by satisfying at least one of the small things.

  When the first rotor inner passage has a plurality of holes, the first virtual cylindrical surface may include all the holes and circumscribe at least one of the holes. . When the stator inner passage has a plurality of holes, the opening area on the first air gap side of the stator inner passage is the opening area of all the holes.

  Further, when the stator inner passage has a plurality of holes, the second virtual cylindrical surface may include all the holes and circumscribe at least one of the holes. When the second rotor inner passage has a plurality of holes, the opening area on the second air gap side of the second rotor inner passage is the opening area of all the holes.

  According to the compressor of the present invention, since the first rotor inner passage, the stator inner passage, and the second rotor inner passage are provided, the refrigerant is added to the conventional outer passage of the motor, The flow mainly flows through the first rotor inner passage, the stator inner passage, and the second rotor inner passage. For this reason, the differential pressure between the upstream side and the downstream side of the motor can be reduced, and the pressure loss of the compressor can be reduced.

  Further, when the opening area of the stator inner passage satisfies that it is smaller than the first virtual air gap area, the lubricating oil is more likely to flow toward the first air gap than the stator inner passage. Furthermore, the lubricating oil adheres to the first rotor in the form of fine particles, is blown to the outer peripheral side of the first rotor by the centrifugal force of the first rotor, and is struck against the sealed container, Liquefaction. In this way, the lubricating oil can be reliably separated from the refrigerant.

  Alternatively, when the opening area of the second rotor inner passage satisfies that the opening area of the second rotor inner passage is smaller than the second virtual air gap area, the lubricating oil is closer to the second air gap than the second rotor inner passage. It becomes easy to flow to. Furthermore, the lubricating oil adheres to the second rotor in the form of fine particles, is blown to the outer peripheral side of the second rotor by the centrifugal force of the second rotor, and is struck against the sealed container, Liquefaction. In this way, the lubricating oil can be reliably separated from the refrigerant.

  Alternatively, the opening area of the stator inner passage is smaller than the first virtual air gap area, and the opening area of the second rotor inner passage is smaller than the second virtual air gap area. When both of these are satisfied, the above-described effects can be satisfied at the same time, and the lubricating oil can be more reliably separated from the refrigerant.

In the compressor of one embodiment,
The motor
A first rotor, a stator and a second rotor arranged in order from upstream to downstream in the direction in which the refrigerant gas flows;
The first rotor and the second rotor are fixed to the first rotor and the second rotor, and the rotational force of the first rotor and the second rotor is transmitted to the compression section, or the first rotor and the second rotor A shaft that extends from the shaft and is held by the bearing or has at least one function.
There is a first air gap between the stator and the first rotor,
Between the stator and the second rotor, there is a second air gap,
The first rotor has a first rotor inner passage that penetrates along the axis of the shaft in the vicinity of the shaft,
The stator has, in the vicinity of the shaft, a stator inner passage that spirally penetrates along or around the axis of the shaft.
The second rotor has a second rotor inner passage that penetrates along the axis of the shaft in the vicinity of the shaft,
The first rotor side virtual circumscribed circle circumscribing the first air gap side opening of the first rotor inner passage and concentric with the shaft is:
Than the stator side virtual circumscribed circle circumscribing the opening on the first air gap side of the stator inner passage and concentric with the shaft,
large.

  The first rotor-side virtual inscribed circle inscribed in the opening on the first air gap side of the first rotor inner passage and concentric with the shaft is the first air gap in the stator inner passage. It is more preferable to make it larger than the stator side virtual circumscribed circle circumscribing the side opening and concentric with the shaft.

  When the first rotor inner passage has a plurality of holes, the first rotor side virtual circumscribed circle includes all the holes and circumscribes at least one of the holes. That's fine. Further, when the stator inner passage has a plurality of holes, the stator side virtual circumscribed circle only needs to include all the holes and circumscribe at least one of the holes.

  According to the compressor of this embodiment, the first rotor-side virtual circumcircle is larger than the stator-side virtual circumcircle on the first air gap side. The lubricating oil can be applied to the first rotor by being reflected by the stator. The lubricating oil can be blown to the outer peripheral side of the first rotor by the centrifugal force of the first rotor.

  In addition, since the first rotor inner passage, the stator inner passage, and the second rotor inner passage are provided, the refrigerant mainly includes the first rotor in addition to the conventional outer passage on the motor. It flows through the rotor inner passage, the stator inner passage, and the second rotor inner passage. For this reason, the differential pressure between the upstream side and the downstream side of the motor can be reduced, and the pressure loss of the compressor can be reduced.

In the compressor of one embodiment,
The motor
A first rotor, a stator and a second rotor arranged in order from upstream to downstream in the direction in which the refrigerant gas flows;
The first rotor and the second rotor are fixed to the first rotor and the second rotor, and the rotational force of the first rotor and the second rotor is transmitted to the compression section, or the first rotor and the second rotor A shaft that extends from the shaft and is held by the bearing or has at least one function.
There is a first air gap between the stator and the first rotor,
Between the stator and the second rotor, there is a second air gap,
The first rotor has a first rotor inner passage that penetrates along the axis of the shaft in the vicinity of the shaft,
The stator has, in the vicinity of the shaft, a stator inner passage that spirally penetrates along or around the axis of the shaft.
The second rotor has a second rotor inner passage that penetrates along the axis of the shaft in the vicinity of the shaft,
A stator-side virtual circumscribed circle circumscribing the opening on the second air gap side of the stator inner passage and concentric with the shaft is:
Than the second rotor side virtual circumscribed circle circumscribing the opening on the second air gap side of the second rotor inner passage and concentric with the shaft,
large.

  The stator side virtual inscribed circle that is inscribed in the opening on the second air gap side of the stator inner passage and concentric with the shaft is the opening on the second air gap side of the second rotor inner passage. It is more preferable to make it larger than the second rotor side virtual circumscribed circle concentric with the shaft and concentric with the shaft.

  When the stator inner passage has a plurality of holes, the stator-side virtual circumcircle may include all the holes and circumscribe at least one of the holes. Further, when the second rotor inner passage has a plurality of holes, the second rotor side virtual circumcircle includes all the holes and circumscribes at least one of the holes. That's fine.

  According to the compressor of this one embodiment, the stator side virtual circumscribed circle on the second air gap side is larger than the second rotor side virtual circumscribed circle, so that the lubrication from the stator inner passage is performed. Oil can be applied to the second rotor. The lubricating oil can be blown to the outer peripheral side of the second rotor by the centrifugal force of the second rotor.

  In addition, since the first rotor inner passage, the stator inner passage, and the second rotor inner passage are provided, the refrigerant mainly includes the first rotor in addition to the conventional outer passage on the motor. It flows through the rotor inner passage, the stator inner passage, and the second rotor inner passage. For this reason, the differential pressure between the upstream side and the downstream side of the motor can be reduced, and the pressure loss of the compressor can be reduced.

In the compressor of one embodiment,
The motor
A first rotor, a stator and a second rotor arranged in order from upstream to downstream in the direction in which the refrigerant gas flows;
The first rotor and the second rotor are fixed to the first rotor and the second rotor, and the rotational force of the first rotor and the second rotor is transmitted to the compression section, or the first rotor and the second rotor A shaft that extends from the shaft and is held by the bearing or has at least one function.
There is a first air gap between the stator and the first rotor,
Between the stator and the second rotor, there is a second air gap,
The first rotor has a first rotor inner passage that penetrates along the axis of the shaft in the vicinity of the shaft,
The stator has, in the vicinity of the shaft, a stator inner passage that spirally penetrates along or around the axis of the shaft.
The second rotor has a second rotor inner passage that penetrates along the axis of the shaft in the vicinity of the shaft,
The first rotor has a permanent magnet,
The permanent magnet has an inter-magnet passage that communicates with the first rotor inner passage and the stator inner passage via the first air gap and extends radially and opens to the outer periphery.

  According to the compressor of this embodiment, since the permanent magnet of the first rotor has the intermagnet passage, the intermagnet passage can be used as the lubricating oil and refrigerant passage. As a result, the passage cross-sectional area of the lubricating oil and refrigerant passing through the first air gap can be increased, and therefore the lubricating oil is blown to the outer peripheral side of the first rotor by the centrifugal force of the first rotor. Can do.

  In addition, since the first rotor inner passage, the stator inner passage, and the second rotor inner passage are provided, the refrigerant mainly includes the first rotor in addition to the conventional outer passage on the motor. It flows through the rotor inner passage, the stator inner passage, and the second rotor inner passage. For this reason, the differential pressure between the upstream side and the downstream side of the motor can be reduced, and the pressure loss of the compressor can be reduced.

In the compressor of one embodiment,
The motor
A first rotor, a stator and a second rotor arranged in order from upstream to downstream in the direction in which the refrigerant gas flows;
The first rotor and the second rotor are fixed to the first rotor and the second rotor, and the rotational force of the first rotor and the second rotor is transmitted to the compression section, or the first rotor and the second rotor A shaft that extends from the shaft and is held by the bearing or has at least one function.
There is a first air gap between the stator and the first rotor,
Between the stator and the second rotor, there is a second air gap,
The first rotor has a first rotor inner passage that penetrates along the axis of the shaft in the vicinity of the shaft,
The stator has, in the vicinity of the shaft, a stator inner passage that spirally penetrates along or around the axis of the shaft.
The second rotor has a second rotor inner passage that penetrates along the axis of the shaft in the vicinity of the shaft,
The second rotor has a permanent magnet,
The permanent magnet has an inter-magnet passage that communicates with the stator inner passage through the second air gap and with the second rotor inner passage and extends in the radial direction and opens to the outer periphery.

  According to the compressor of this one embodiment, since the permanent magnet of the second rotor has the passage between magnets, the passage between magnets can be used as a passage for lubricating oil and refrigerant. As a result, the passage cross-sectional area of the lubricating oil and refrigerant passing through the second air gap can be increased, so that the differential pressure between the upstream side and the downstream side of the motor can be further reduced, and the pressure loss of the compressor can be further reduced. it can.

  In addition, since the first rotor inner passage, the stator inner passage, and the second rotor inner passage are provided, the refrigerant mainly includes the first rotor in addition to the conventional outer passage on the motor. It flows through the rotor inner passage, the stator inner passage, and the second rotor inner passage. For this reason, the differential pressure between the upstream side and the downstream side of the motor can be reduced, and the pressure loss of the compressor can be reduced.

In the compressor of one embodiment,
The motor
A first rotor, a stator and a second rotor arranged in order from upstream to downstream in the direction in which the refrigerant gas flows;
The first rotor and the second rotor are fixed to the first rotor and the second rotor, and the rotational force of the first rotor and the second rotor is transmitted to the compression section, or the first rotor and the second rotor A shaft that extends from the shaft and is held by the bearing or has at least one function.
There is a first air gap between the stator and the first rotor,
Between the stator and the second rotor, there is a second air gap,
The first rotor is
A first rotor inner passage that penetrates along the axis of the shaft in the vicinity of the shaft;
A first rotor outer passage provided on the sealed container side,
The stator is
In the vicinity of the shaft, along the axis of the shaft, or a stator inner passage that spirally penetrates around or inside the axis; and
A stator outer passage provided on the closed container side,
The second rotor has a second rotor inner passage that penetrates along the axis of the shaft in the vicinity of the shaft,
The opening area of the stator outer passage on the first air gap side is smaller than the opening area of the first rotor outer passage on the first air gap side.

  Here, the stator outer passage includes a clearance between the stator and the sealed container, and a through hole provided in the axial direction in the vicinity of the outer periphery of the stator, and only one of them may be provided. . For example, the through hole is provided on the outer peripheral side of the coil, and a thin portion with a very small width is provided between the through hole and the outer periphery of the stator. Similarly, the first rotor outer passage includes a gap between the first rotor and the sealed container, and a through hole provided in the axial direction in the vicinity of the outer periphery of the first rotor, Only a through hole provided in the axial direction may be provided in the vicinity of the outer periphery of the rotor.

  According to the compressor of this embodiment, the opening area of the stator outer passage on the first air gap side is smaller than the opening area of the first rotor outer passage on the first air gap side. The lubricating oil can be guided to the first rotor outer passage rather than the stator outer passage, and the lubricating oil can be reliably guided to the upstream side of the motor.

  In addition, since the first rotor inner passage, the stator inner passage, and the second rotor inner passage are provided, the refrigerant mainly includes the first rotor in addition to the conventional outer passage on the motor. It flows through the rotor inner passage, the stator inner passage, and the second rotor inner passage. For this reason, the differential pressure between the upstream side and the downstream side of the motor can be reduced, and the pressure loss of the compressor can be reduced.

In the compressor of one embodiment,
The motor
A first rotor, a stator and a second rotor arranged in order from upstream to downstream in the direction in which the refrigerant gas flows;
The first rotor and the second rotor are fixed to the first rotor and the second rotor, and the rotational force of the first rotor and the second rotor is transmitted to the compression section, or the first rotor and the second rotor A shaft that extends from the shaft and is held by the bearing or has at least one function.
There is a first air gap between the stator and the first rotor,
Between the stator and the second rotor, there is a second air gap,
The first rotor has a first rotor inner passage that penetrates along the axis of the shaft in the vicinity of the shaft,
The stator is
In the vicinity of the shaft, along the axis of the shaft, or a stator inner passage that spirally penetrates around or inside the axis; and
A stator outer passage provided on the closed container side,
The second rotor is
A second rotor inner passage that penetrates along the axis of the shaft in the vicinity of the shaft;
A second rotor outer passage provided on the sealed container side,
The opening area of the second rotor outer passage on the second air gap side is smaller than the opening area of the stator outer passage on the second air gap side.

  Here, the stator outer passage includes a gap between the stator and the sealed container, and a through hole provided in the axial direction in the vicinity of the outer periphery of the stator. For example, the through hole is provided on the outer peripheral side of the coil, and a thin portion with a very small width is provided between the through hole and the outer periphery of the stator. Similarly, the second rotor outer passage includes a gap between the second rotor and the sealed container, and a through hole provided in the axial direction in the vicinity of the outer periphery of the second rotor.

  According to the compressor of this embodiment, the opening area of the second rotor outer passage on the second air gap side is smaller than the opening area of the stator outer passage on the second air gap side. The lubricating oil can be guided to the stator outer passage rather than the second rotor outer passage, and the lubricating oil can be reliably guided to the upstream side of the motor.

In the compressor of one embodiment,
The motor
A first rotor, a stator and a second rotor arranged in order from upstream to downstream in the direction in which the refrigerant gas flows;
The first rotor and the second rotor are fixed to the first rotor and the second rotor, and the rotational force of the first rotor and the second rotor is transmitted to the compression section, or the first rotor and the second rotor A shaft that extends from the shaft and is held by the bearing or has at least one function.
There is a first air gap between the stator and the first rotor,
Between the stator and the second rotor, there is a second air gap,
The first rotor has a first rotor inner passage that penetrates along the axis of the shaft in the vicinity of the shaft,
The stator has, in the vicinity of the shaft, a stator inner passage that spirally penetrates along or around the axis of the shaft.
The second rotor has a second rotor inner passage that penetrates along the axis of the shaft in the vicinity of the shaft,
The opposed surface of the first rotor facing the stator and the opposed surface of the stator facing the first rotor are substantially circular,
The outer diameter of the facing surface of the stator facing the first rotor is larger than the outer diameter of the facing surface of the first rotor facing the stator.

  According to the compressor of this one embodiment, the outer diameter of the opposing surface of the stator is larger than the outer diameter of the opposing surface of the first rotor in the opposing surfaces of the first rotor and the stator. Therefore, the lubricating oil can be guided to the gap between the first rotor and the sealed container rather than the gap between the stator and the sealed container, and the lubricating oil can be upstream of the motor. Can be reliably guided to the side.

  In addition, since the first rotor inner passage, the stator inner passage, and the second rotor inner passage are provided, the refrigerant mainly includes the first rotor in addition to the conventional outer passage on the motor. It flows through the rotor inner passage, the stator inner passage, and the second rotor inner passage. For this reason, the differential pressure between the upstream side and the downstream side of the motor can be reduced, and the pressure loss of the compressor can be reduced.

The motor
A first rotor, a stator and a second rotor arranged in order from upstream to downstream in the direction in which the refrigerant gas flows;
The first rotor and the second rotor are fixed to the first rotor and the second rotor, and the rotational force of the first rotor and the second rotor is transmitted to the compression section, or the first rotor and the second rotor A shaft that extends from the shaft and is held by the bearing or has at least one function.
There is a first air gap between the stator and the first rotor,
Between the stator and the second rotor, there is a second air gap,
The first rotor has a first rotor inner passage that penetrates along the axis of the shaft in the vicinity of the shaft,
The stator has, in the vicinity of the shaft, a stator inner passage that spirally penetrates along or around the axis of the shaft.
The second rotor has a second rotor inner passage that penetrates along the axis of the shaft in the vicinity of the shaft,
The facing surface of the second rotor that faces the stator and the facing surface of the stator that faces the second rotor are substantially circular,
The outer diameter of the facing surface of the second rotor facing the stator is larger than the outer diameter of the facing surface of the stator facing the second rotor.

  According to the compressor of this one embodiment, the outer diameter of the opposing surface of the second rotor is larger than the outer diameter of the opposing surface of the stator in the opposing surfaces of the second rotor and the stator. Therefore, the lubricating oil can be guided to the gap between the stator and the sealed container rather than the gap between the second rotor and the sealed container, and the lubricating oil can be upstream of the motor. Can be reliably guided to the side.

  In addition, since the first rotor inner passage, the stator inner passage, and the second rotor inner passage are provided, the refrigerant mainly includes the first rotor in addition to the conventional outer passage on the motor. It flows through the rotor inner passage, the stator inner passage, and the second rotor inner passage. For this reason, the differential pressure between the upstream side and the downstream side of the motor can be reduced, and the pressure loss of the compressor can be reduced.

In the compressor of one embodiment,
The motor
A first rotor, a stator and a second rotor arranged in order from upstream to downstream in the direction in which the refrigerant gas flows;
The first rotor and the second rotor are fixed to the first rotor and the second rotor, and the rotational force of the first rotor and the second rotor is transmitted to the compression section, or the first rotor and the second rotor A shaft that extends from the shaft and is held by the bearing or has at least one function.
There is a first air gap between the stator and the first rotor,
Between the stator and the second rotor, there is a second air gap,
The first rotor is
A first rotor inner passage that penetrates along the axis of the shaft in the vicinity of the shaft;
A first rotor outer passage provided on the sealed container side,
The stator is
In the vicinity of the shaft, along the axis of the shaft, or a stator inner passage that spirally penetrates around or inside the axis; and
A stator outer passage provided on the closed container side,
The second rotor has a second rotor inner passage that penetrates along the axis of the shaft in the vicinity of the shaft,
An opening area on the first air gap side of the first rotor outer passage is larger than an opening area on the first air gap side of the first rotor inner passage;
Or
An opening area on the second air gap side of the stator outer passage satisfies at least one of being larger than an opening area on the second air gap side of the stator inner passage.

  According to the compressor of this embodiment, since the first air gap functions as a so-called centrifugal pump, the outer diameter side (outside of the first rotor) is usually set from the inner diameter side (first rotor inner passage). The pressure in the aisle is higher. Therefore, by making the first rotor outer passage large, the lubricating oil can be effectively returned to the upstream (lower) space of the motor. Further, the area of the refrigerant passage can be effectively increased without sacrificing the magnetic path of the motor at the large diameter portion, and there is an effect that oil rise prevention and differential pressure and pressure loss reduction are realized.

  Further, since the second air gap functions as a so-called centrifugal pump, the pressure on the outer diameter side (stator outer passage) is usually higher than the inner diameter side (stator inner passage). Therefore, by enlarging the stator outer passage, the lubricating oil can be effectively returned to the upstream (lower) space of the motor. Further, the area of the refrigerant passage can be effectively increased without sacrificing the magnetic path of the motor at the large diameter portion, and there is an effect that oil rise prevention and differential pressure and pressure loss reduction are realized.

  In addition, since the first rotor inner passage, the stator inner passage, and the second rotor inner passage are provided, the refrigerant mainly includes the first rotor in addition to the conventional outer passage on the motor. It flows through the rotor inner passage, the stator inner passage, and the second rotor inner passage. For this reason, the differential pressure between the upstream side and the downstream side of the motor can be reduced, and the pressure loss of the compressor can be reduced.

In the compressor of one embodiment,
The motor
A first rotor, a stator and a second rotor arranged in order from upstream to downstream in the direction in which the refrigerant gas flows;
The first rotor and the second rotor are fixed to the first rotor and the second rotor, and the rotational force of the first rotor and the second rotor is transmitted to the compression section, or the first rotor and the second rotor A shaft that extends from the shaft and is held by the bearing or has at least one function.
There is a first air gap between the stator and the first rotor,
Between the stator and the second rotor, there is a second air gap,
The first rotor has a first rotor inner passage that penetrates along the axis of the shaft in the vicinity of the shaft,
The stator has, in the vicinity of the shaft, a stator inner passage that spirally penetrates along or around the axis of the shaft.
The second rotor is
A second rotor inner passage that penetrates along the axis of the shaft in the vicinity of the shaft;
A second rotor outer passage provided on the sealed container side,
The opening area of the second rotor outer passage on the side opposite to the second air gap is larger than the opening area of the second rotor inner passage on the side opposite to the second air gap.

  According to the compressor of this embodiment, the lubricating oil that has flowed into the downstream (upper) space of the motor can be effectively returned through the second rotor inner passage. Further, the area of the refrigerant passage can be effectively increased without sacrificing the magnetic path of the motor at the large diameter portion, and there is an effect that oil rise prevention and differential pressure and pressure loss reduction are realized.

  In addition, since the first rotor inner passage, the stator inner passage, and the second rotor inner passage are provided, the refrigerant mainly includes the first rotor in addition to the conventional outer passage on the motor. It flows through the rotor inner passage, the stator inner passage, and the second rotor inner passage. For this reason, the differential pressure between the upstream side and the downstream side of the motor can be reduced, and the pressure loss of the compressor can be reduced.

The compressor of the present invention is
The motor
A first stator, a rotor, and a second stator that are arranged in order from upstream to downstream in the direction in which the refrigerant gas flows;
A shaft which is fixed to the rotor and transmits the rotational force of the rotor to the compression unit, or is extended from the rotor and held by a bearing, or has a shaft having at least one function,
A first air gap is provided between the rotor and the first stator,
There is a second air gap between the rotor and the second stator,
The first stator has a first stator inner passage penetrating along the axis of the shaft in or near the shaft,
The rotor has, in the vicinity of the shaft, a rotor inner passage that spirally penetrates along or around the axis of the shaft.
The second stator has a second stator inner passage that spirally penetrates along or around the axis of the shaft in or near the shaft.
The opening area of the rotor inner passage on the first air gap side is:
The area of the portion of the first virtual cylindrical surface that circumscribes the opening on the first air gap side of the first stator inner passage and that is concentric with the shaft is in the first air gap. Than the virtual air gap area of
Small,
Or
The opening area of the second stator inner passage on the second air gap side is:
Second virtual air that is the area of a portion of the second virtual cylindrical surface that circumscribes the opening of the rotor inner passage on the second air gap side and concentric with the shaft is in the second air gap. Than the gap area
It is characterized by satisfying at least one of the small things.

  In the case where a bearing is provided in the stator and it is necessary to supply lubricating oil to the bearing, a means for supplying lubricating oil to the bearing in the stator may be provided separately, or the stator inner passage may also be used. .

  When the first stator inner passage has a plurality of holes, the first virtual cylindrical surface may include all the holes and circumscribe at least one of the holes. . When the rotor inner passage has a plurality of holes, the opening area of the rotor inner passage on the first air gap side is the opening area of all the holes.

  When the rotor inner passage has a plurality of holes, the second virtual cylindrical surface may include all the holes and circumscribe at least one of the holes. When the second stator inner passage has a plurality of holes, the opening area of the second stator inner passage on the second air gap side is the opening area of all the holes.

  According to the compressor of the present invention, since the first stator inner passage, the rotor inner passage, and the second stator inner passage are provided, the refrigerant is added to the conventional outer passage of the motor, It mainly flows through the first stator inner passage, the rotor inner passage, and the second stator inner passage. For this reason, the differential pressure between the upstream side and the downstream side of the motor can be reduced, and the pressure loss of the compressor can be reduced.

  Moreover, when satisfy | filling that the opening area of the said rotor inner side passage is smaller than the said 1st virtual air gap area, lubricating oil becomes easy to flow to the said 1st air gap side rather than the said rotor inner side channel | path. Furthermore, the lubricating oil adheres to the rotor in the form of fine particles, is blown to the outer peripheral side of the rotor by the centrifugal force of the rotor, is struck by the sealed container, and is liquefied. In this way, the lubricating oil can be reliably separated from the refrigerant.

  Alternatively, when the opening area of the second stator inner passage satisfies that the opening area of the second stator inner passage is smaller than the second virtual air gap area, the lubricating oil is closer to the second air gap than the second stator inner passage. It becomes easy to flow to. Furthermore, the lubricating oil adheres to the rotor in the form of fine particles, is blown to the outer peripheral side of the rotor by the centrifugal force of the rotor, is struck by the sealed container, and is liquefied. In this way, the lubricating oil can be reliably separated from the refrigerant.

  Alternatively, the opening area of the rotor inner passage is smaller than the first virtual air gap area, and the opening area of the second stator inner passage is smaller than the second virtual air gap area. When both of these are satisfied, the above-described effects can be satisfied at the same time, and the lubricating oil can be more reliably separated from the refrigerant.

In the compressor of one embodiment,
The motor
A first stator, a rotor, and a second stator that are arranged in order from upstream to downstream in the direction in which the refrigerant gas flows;
A shaft which is fixed to the rotor and transmits the rotational force of the rotor to the compression unit, or is extended from the rotor and held by a bearing, or has a shaft having at least one function,
A first air gap is provided between the rotor and the first stator,
There is a second air gap between the rotor and the second stator,
The first stator has a first stator inner passage penetrating along the axis of the shaft in or near the shaft,
The rotor has, in the vicinity of the shaft, a rotor inner passage that spirally penetrates along or around the axis of the shaft.
The second stator has a second stator inner passage that spirally penetrates along or around the axis of the shaft in or near the shaft.
The first stator side virtual circumscribed circle circumscribing the opening on the first air gap side of the first stator inner passage and concentric with the shaft is:
Than the rotor-side virtual circumscribed circle circumscribing the opening on the first air gap side of the rotor inner passage and concentric with the shaft,
large.

  The first stator-side virtual inscribed circle that is inscribed in the opening on the first air gap side of the first stator inner passage and is concentric with the shaft is the first air gap in the rotor inner passage. It is more preferable to make it larger than the rotor side virtual circumscribed circle that circumscribes the side opening and concentric with the shaft.

  When the first stator inner passage has a plurality of holes, the first stator side virtual circumscribed circle includes all the holes and circumscribes at least one of the holes. That's fine. When the rotor inner passage has a plurality of holes, the rotor-side virtual circumcircle may include all the holes and circumscribe at least one of the holes.

  According to the compressor of this one embodiment, the first stator side virtual circumscribed circle is larger than the rotor side virtual circumscribed circle on the first air gap side. The lubricant can be applied to the rotor. And the said lubricating oil can be blown to the outer peripheral side of the said rotor with the centrifugal force of the said rotor.

  In addition, since the first stator inner passage, the rotor inner passage, and the second stator inner passage are provided, the refrigerant mainly includes the first stator in addition to the conventional outer peripheral passage of the motor. It flows through the stator inner passage, the rotor inner passage, and the second stator inner passage. For this reason, the differential pressure between the upstream side and the downstream side of the motor can be reduced, and the pressure loss of the compressor can be reduced.

In the compressor of one embodiment,
The motor
A first stator, a rotor, and a second stator that are arranged in order from upstream to downstream in the direction in which the refrigerant gas flows;
A shaft which is fixed to the rotor and transmits the rotational force of the rotor to the compression unit, or is extended from the rotor and held by a bearing, or has a shaft having at least one function,
A first air gap is provided between the rotor and the first stator,
There is a second air gap between the rotor and the second stator,
The first stator has a first stator inner passage penetrating along the axis of the shaft in or near the shaft,
The rotor has, in the vicinity of the shaft, a rotor inner passage that spirally penetrates along or around the axis of the shaft.
The second stator has a second stator inner passage that spirally penetrates along or around the axis of the shaft in or near the shaft.
The rotor side virtual circumscribed circle circumscribing the opening on the second air gap side of the rotor inner passage and concentric with the shaft is:
Than the second stator side virtual circumscribed circle circumscribing the opening on the second air gap side of the second stator inner passage and concentric with the shaft,
large.

  The rotor side virtual inscribed circle that is inscribed in the opening on the second air gap side of the rotor inner passage and concentric with the shaft is the opening on the second air gap side of the second stator inner passage. It is more preferable to make it larger than the second stator side virtual circumscribed circle concentric with the shaft and concentric with the shaft.

  When the rotor inner passage has a plurality of holes, the rotor-side virtual circumcircle may include all the holes and circumscribe at least one of the holes. In the case where the second stator inner passage has a plurality of holes, the second stator side virtual circumscribed circle includes all the holes and circumscribes at least one of the holes. That's fine.

  According to the compressor of this one embodiment, the rotor side virtual circumscribed circle on the second air gap side is larger than the second stator side virtual circumscribed circle, so the lubrication from the rotor inner passage is performed. Oil can be reflected against the second stator and deposited on the rotor. And the said lubricating oil can be blown to the outer peripheral side of the said rotor with the centrifugal force of the said rotor.

  In addition, since the first stator inner passage, the rotor inner passage, and the second stator inner passage are provided, the refrigerant mainly includes the first stator in addition to the conventional outer peripheral passage of the motor. It flows through the stator inner passage, the rotor inner passage, and the second stator inner passage. For this reason, the differential pressure between the upstream side and the downstream side of the motor can be reduced, and the pressure loss of the compressor can be reduced.

In the compressor of one embodiment,
The motor
A first stator, a rotor, and a second stator that are arranged in order from upstream to downstream in the direction in which the refrigerant gas flows;
A shaft which is fixed to the rotor and transmits the rotational force of the rotor to the compression unit, or is extended from the rotor and held by a bearing, or has a shaft having at least one function,
A first air gap is provided between the rotor and the first stator,
There is a second air gap between the rotor and the second stator,
The first stator has a first stator inner passage penetrating along the axis of the shaft in or near the shaft,
The rotor has, in the vicinity of the shaft, a rotor inner passage that spirally penetrates along or around the axis of the shaft.
The second stator has a second stator inner passage that spirally penetrates along or around the axis of the shaft in or near the shaft.
The rotor has a permanent magnet,
The permanent magnets pass through the rotor inner passage, the first stator inner passage through the first air gap, and the second stator inner passage through the second air gap. It has a passage between magnets that extends in the radial direction and opens to the outer periphery.

  According to the compressor of this embodiment, since the permanent magnet of the rotor has the passage between magnets, the passage between magnets can be used as a passage for the lubricating oil and refrigerant. Accordingly, the passage cross-sectional area of the lubricating oil and the refrigerant passing through the air gap can be enlarged, so that the lubricating oil can be blown to the outer peripheral side of the rotor by the centrifugal force of the rotor.

In the compressor of one embodiment,
The motor
A first stator, a rotor, and a second stator that are arranged in order from upstream to downstream in the direction in which the refrigerant gas flows;
A shaft which is fixed to the rotor and transmits the rotational force of the rotor to the compression unit, or is extended from the rotor and held by a bearing, or has a shaft having at least one function,
A first air gap is provided between the rotor and the first stator,
There is a second air gap between the rotor and the second stator,
The first stator is
A first stator inner passage that passes through or along the axis of the shaft in or near the shaft;
A first stator outer passage provided on the closed container side,
The rotor is
In the vicinity of the shaft, along the axis of the shaft, or a rotor inner passage that spirally penetrates around or inside the axis;
A rotor outer passage provided on the closed container side,
The second stator has a second stator inner passage that spirally penetrates along or around the axis of the shaft in or near the shaft.
The opening area of the rotor outer passage on the first air gap side is smaller than the opening area of the first stator outer passage on the first air gap side.

  Here, the first stator outer passage includes a gap between the first stator and the sealed container, and a through hole provided in the axial direction in the vicinity of the outer periphery of the first stator. Only one of them may be provided. For example, the through hole is provided on the outer peripheral side of the coil, and a thin portion with a very small width is provided between the through hole and the outer periphery of the stator. Similarly, the rotor outer passage includes a gap between the rotor and the hermetic container, and a through hole provided in the axial direction near the outer periphery of the rotor, and is provided in the axial direction near the outer periphery of the rotor. Only the provided through holes may be provided.

  According to the compressor of this embodiment, the opening area of the rotor outer passage on the first air gap side is smaller than the opening area of the first stator outer passage on the first air gap side. The lubricating oil can be guided to the first stator outer passage rather than the rotor outer passage, and the lubricating oil can be reliably guided to the upstream side of the motor.

  In addition, since the first stator inner passage, the rotor inner passage, and the second stator inner passage are provided, the refrigerant mainly includes the first stator in addition to the conventional outer peripheral passage of the motor. It flows through the stator inner passage, the rotor inner passage, and the second stator inner passage. For this reason, the differential pressure between the upstream side and the downstream side of the motor can be reduced, and the pressure loss of the compressor can be reduced.

In the compressor of one embodiment,
The motor
A first stator, a rotor, and a second stator that are arranged in order from upstream to downstream in the direction in which the refrigerant gas flows;
A shaft which is fixed to the rotor and transmits the rotational force of the rotor to the compression unit, or is extended from the rotor and held by a bearing, or has a shaft having at least one function,
A first air gap is provided between the rotor and the first stator,
There is a second air gap between the rotor and the second stator,
The first stator has a first stator inner passage penetrating along the axis of the shaft in or near the shaft,
The rotor is
In the vicinity of the shaft, along the axis of the shaft, or a rotor inner passage that spirally penetrates around or inside the axis;
A rotor outer passage provided on the closed container side,
The second stator is
A second stator inner passage that spirally penetrates along or around the axis of the shaft in or near the shaft;
A second stator outer passage provided on the closed container side,
The opening area of the second stator outer passage on the second air gap side is smaller than the opening area of the rotor outer passage on the second air gap side.

  Here, the second stator outer passage includes a gap between the second stator and the sealed container, and a through hole provided in the axial direction in the vicinity of the outer periphery of the second stator. For example, the through hole is provided on the outer peripheral side of the coil, and a thin portion with a very small width is provided between the through hole and the outer periphery of the stator. Similarly, the rotor outer passage includes a gap between the rotor and the sealed container, and a through hole provided in the axial direction near the outer periphery of the rotor.

  According to the compressor of this embodiment, the opening area of the second stator outer passage on the second air gap side is smaller than the opening area of the rotor outer passage on the second air gap side. The lubricating oil can be guided to the rotor outer passage rather than the second stator outer passage, and the lubricating oil can be reliably guided to the upstream side of the motor.

  In addition, since the first stator inner passage, the rotor inner passage, and the second stator inner passage are provided, the refrigerant mainly includes the first stator in addition to the conventional outer peripheral passage of the motor. It flows through the stator inner passage, the rotor inner passage, and the second stator inner passage. For this reason, the differential pressure between the upstream side and the downstream side of the motor can be reduced, and the pressure loss of the compressor can be reduced.

In the compressor of one embodiment,
The motor
A first stator, a rotor, and a second stator that are arranged in order from upstream to downstream in the direction in which the refrigerant gas flows;
A shaft which is fixed to the rotor and transmits the rotational force of the rotor to the compression unit, or is extended from the rotor and held by a bearing, or has a shaft having at least one function,
A first air gap is provided between the rotor and the first stator,
There is a second air gap between the rotor and the second stator,
The first stator has a first stator inner passage penetrating along the axis of the shaft in or near the shaft,
The rotor has, in the vicinity of the shaft, a rotor inner passage that spirally penetrates along or around the axis of the shaft.
The second stator has a second stator inner passage that spirally penetrates along or around the axis of the shaft in or near the shaft.
The opposed surface of the first stator that faces the rotor and the opposed surface of the rotor that faces the first stator are substantially circular,
The outer diameter of the facing surface of the rotor facing the first stator is larger than the outer diameter of the facing surface of the first stator facing the rotor.

  According to the compressor of this one embodiment, the outer diameter of the opposing surface of the rotor is larger than the outer diameter of the opposing surface of the first stator in the opposing surfaces of the first stator and the rotor. Therefore, the lubricating oil can be guided to the gap between the first stator and the sealed container rather than the gap between the rotor and the sealed container, and the lubricating oil can be upstream of the motor. Can be reliably guided to the side.

  In addition, since the first stator inner passage, the rotor inner passage, and the second stator inner passage are provided, the refrigerant mainly includes the first stator in addition to the conventional outer peripheral passage of the motor. It flows through the stator inner passage, the rotor inner passage, and the second stator inner passage. For this reason, the differential pressure between the upstream side and the downstream side of the motor can be reduced, and the pressure loss of the compressor can be reduced.

In the compressor of one embodiment,
The motor
A first stator, a rotor, and a second stator that are arranged in order from upstream to downstream in the direction in which the refrigerant gas flows;
A shaft which is fixed to the rotor and transmits the rotational force of the rotor to the compression unit, or is extended from the rotor and held by a bearing, or has a shaft having at least one function,
A first air gap is provided between the rotor and the first stator,
There is a second air gap between the rotor and the second stator,
The first stator has a first stator inner passage penetrating along the axis of the shaft in or near the shaft,
The rotor has, in the vicinity of the shaft, a rotor inner passage that spirally penetrates along or around the axis of the shaft.
The second stator has a second stator inner passage that spirally penetrates along or around the axis of the shaft in or near the shaft.
The opposing surface of the second stator that faces the rotor and the opposing surface of the rotor that faces the second stator are substantially circular,
The outer diameter of the facing surface of the second stator that faces the rotor is larger than the outer diameter of the facing surface of the rotor that faces the second stator.

  According to the compressor of this one embodiment, the outer diameter of the opposing surface of the second stator is larger than the outer diameter of the opposing surface of the rotor in the opposing surfaces of the second stator and the rotor. Therefore, the lubricating oil can be guided to the gap between the rotor and the sealed container rather than the gap between the second stator and the sealed container, and the lubricating oil can be upstream of the motor. Can be reliably guided to the side.

  In addition, since the first stator inner passage, the rotor inner passage, and the second stator inner passage are provided, the refrigerant mainly includes the first stator in addition to the conventional outer peripheral passage of the motor. It flows through the stator inner passage, the rotor inner passage, and the second stator inner passage. For this reason, the differential pressure between the upstream side and the downstream side of the motor can be reduced, and the pressure loss of the compressor can be reduced.

In the compressor of one embodiment,
The motor
A first stator, a rotor, and a second stator that are arranged in order from upstream to downstream in the direction in which the refrigerant gas flows;
A shaft which is fixed to the rotor and transmits the rotational force of the rotor to the compression unit, or is extended from the rotor and held by a bearing, or has a shaft having at least one function,
A first air gap is provided between the rotor and the first stator,
There is a second air gap between the rotor and the second stator,
The first stator is
A first stator inner passage that passes through or along the axis of the shaft in or near the shaft;
A first stator outer passage provided on the closed container side,
The rotor is
In the vicinity of the shaft, along the axis of the shaft, or a rotor inner passage that spirally penetrates around or inside the axis;
A rotor outer passage provided on the closed container side,
The second stator has a second stator inner passage that spirally penetrates along or around the axis of the shaft in or near the shaft.
An opening area of the first stator outer passage on the first air gap side is larger than an opening area of the first stator inner passage on the first air gap side;
Or
The opening area of the rotor outer passage on the second air gap side satisfies at least one of larger than the opening area of the rotor inner passage on the second air gap side.

  According to the compressor of this embodiment, since the first air gap functions as a so-called centrifugal pump, the outer diameter side (outside of the first stator) is usually from the inner diameter side (first stator inner passage). The pressure in the aisle is higher. Therefore, by making the first stator outer passage large, the lubricating oil can be effectively returned to the upstream (lower) space of the motor. Further, the area of the refrigerant passage can be effectively increased without sacrificing the magnetic path of the motor at the large diameter portion, and there is an effect that oil rise prevention and differential pressure and pressure loss reduction are realized.

  In addition, since the second air gap functions as a so-called centrifugal pump, the pressure on the outer diameter side (rotor outer passage) is usually higher than the inner diameter side (rotor inner passage). Therefore, by enlarging the rotor outer passage, the lubricating oil can be effectively returned to the upstream (lower) space of the motor. Further, the area of the refrigerant passage can be effectively increased without sacrificing the magnetic path of the motor at the large diameter portion, and there is an effect that oil rise prevention and differential pressure and pressure loss reduction are realized.

  Since the stator inner passage and the rotor inner passage are provided, the refrigerant mainly flows through the stator inner passage and the rotor inner passage in addition to the conventional outer peripheral passage of the motor. For this reason, the differential pressure between the upstream side and the downstream side of the motor can be reduced, and the pressure loss of the compressor can be reduced.

In the compressor of one embodiment,
The motor
A first stator, a rotor, and a second stator that are arranged in order from upstream to downstream in the direction in which the refrigerant gas flows;
A shaft which is fixed to the rotor and transmits the rotational force of the rotor to the compression unit, or is extended from the rotor and held by a bearing, or has a shaft having at least one function,
A first air gap is provided between the rotor and the first stator,
There is a second air gap between the rotor and the second stator,
The first stator has a first stator inner passage penetrating along the axis of the shaft in or near the shaft,
The rotor has, in the vicinity of the shaft, a rotor inner passage that spirally penetrates along or around the axis of the shaft.
The second stator is
A second stator inner passage that spirally penetrates along or around the axis of the shaft in or near the shaft;
A second stator outer passage provided on the closed container side,
The opening area of the second stator outer passage opposite to the second air gap is larger than the opening area of the second stator inner passage opposite to the second air gap.

  According to the compressor of this embodiment, the lubricating oil that has flowed into the downstream (upper) space of the motor can be effectively returned through the second stator inner passage. Further, the area of the refrigerant passage can be effectively increased without sacrificing the magnetic path of the motor at the large diameter portion, and there is an effect that oil rise prevention and differential pressure and pressure loss reduction are realized.

  In addition, since the first rotor inner passage, the stator inner passage, and the second rotor inner passage are provided, the refrigerant mainly includes the first rotor in addition to the conventional outer passage on the motor. It flows through the rotor inner passage, the stator inner passage, and the second rotor inner passage. For this reason, the differential pressure between the upstream side and the downstream side of the motor can be reduced, and the pressure loss of the compressor can be reduced.

  According to the compressor of the present invention, since the refrigerant flows through the stator inner passage and the rotor inner passage, the differential pressure between the upstream side and the downstream side of the motor can be reduced, and the pressure loss of the compressor can be reduced. Further, since the lubricating oil easily flows to the air gap side, the lubricating oil can be reliably separated from the refrigerant. Also, since the lubricant can be prevented from exiting from the compressor container through the discharge pipe, the amount of lubricant can be reduced, and therefore the height of the oil sump can be reduced, resulting in a smaller compressor. It is also possible to do.

  Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

(First embodiment)
FIG. 1 is a longitudinal sectional view showing an embodiment of the compressor of the present invention. The compressor includes an axial gap type motor 2 and a compression unit 11 driven by the motor 2, which are disposed in the sealed container 1 in order from the top to the bottom. Here, the upward direction refers to an upward direction along the central axis of the sealed container 1 regardless of whether or not the central axis of the sealed container 1 is inclined with respect to a horizontal plane.

  The motor 2 is disposed in a region in the sealed container 1 that is filled with the high-pressure refrigerant discharged from the compression unit 11. Specifically, the inside of the sealed container 1 is a high-pressure region H, and this compressor is a so-called high-pressure dome type.

  The motor 2 includes a stator 21, a rotor 31 disposed on the stator 21 via an air gap 41, and is fixed to the rotor 31 and transmits the rotational force of the rotor 31 to the compression unit 11. And a shaft 20 that extends from the rotor 31 and is held by a bearing.

  As shown in FIGS. 2, 3 </ b> A, and 3 </ b> B, the stator 21 includes an iron core 24 attached to the sealed container 1 and a coil 23 attached to the iron core 24.

  The iron core 24 has an annular base 24a disposed so as to be substantially orthogonal to the shaft 20, and a protrusion 24b provided on one surface of the base 24a on the rotor 31 side.

  The protrusions 24 b extend along the shaft 20, and a plurality of the protrusions 24 b are provided around the shaft 20. The coil 23 is wound around the axis of each protrusion 24b. The coil 23 is excited to generate an axial magnetic flux at the protrusion 24b. The coil 23 is so-called “concentrated winding” around the iron core 24, so that the winding is simple and the amount of copper can be reduced.

  There are six protrusions 24b and coils 23, respectively, and the stator 21 has four poles. That is, the stator 21 is considered to correspond to a concentrated winding 4 pole 6 slot of a radial gap type motor. The windings are three-phase, for example, star-connected and supplied with current from an inverter.

  The stator 21 has a stator plate 25 that sandwiches the coil 23 in cooperation with the iron core 24. The stator plate 25 is made of a magnetic material, and is provided with slits 25a that magnetically insulate between the adjacent protrusions 24b. The slits 25a extend radially outward from the center of the stator plate 25 in the radial direction. The slit 25a is provided only in the stator plate 25 and is not provided in the base 24a. With this configuration, the stator core area facing the air gap 41 increases, so that the flux linkage can be increased. The stator plate 25 is not essential.

  The stator 21 has a stator inner passage 21 a penetrating along the axis of the shaft 20 in the vicinity of the shaft 20. The stator inner passage 21 a has a hole 25 c provided in the stator plate 25 and a hole 24 c provided in the iron core 24. Here, the vicinity of the shaft 20 is the vicinity of the inner diameter of the stator 21, and is generally an inner portion in the axial direction with respect to the coil 23. That is, the rotor 31 and the stator 21 exchange magnetic fluxes via the air gap 41, and as a result, are on the inner peripheral side from the portion that generates torque.

  Specifically, a hole through which the shaft 20 is inserted is provided in the central portion of the stator plate 25, and a plurality of the hole portions 25c are provided at regular intervals around the shaft insertion hole. A hole through which the shaft 20 is inserted is provided at the center of the base 24a of the iron core 24, and a plurality of the holes 24c are provided around the shaft insertion hole at regular intervals. The hole portion 25c provided in the stator plate 25 and the hole portion 24c provided in the base 24a are arranged on a substantially straight line in the axial direction, and are combined as a stator inner passage 21a. And the lubricating oil are arranged to communicate with each other. Here, the stator plate 25 is desirably magnetically independent from the shaft 20 that is a magnetic material. This is to prevent the four-pole magnetic field appearing on the surface of the stator plate 25 from being weakened by a short circuit of magnetic flux through the shaft 20. This is not the case when the shaft 20 is a non-magnetic material. In this case, the gap between the shaft 20 and the stator plate 25 is also a part of the hole area.

  As shown in FIGS. 2, 4A and 4B, the rotor 31 includes an annular back yoke 34 attached to the shaft 20 and a permanent magnet provided on one surface of the back yoke 34 on the stator 21 side. 33.

  The back yoke 34 is made of a magnetic material. The permanent magnet 33 has different magnetic poles alternately in the circumferential direction of the shaft 20. The permanent magnet 33 generates a magnetic flux in a direction along the shaft 20.

  Since the rotor 31 has the permanent magnet 33, when the motor 2 is stopped, the rotor 31 can be attracted to the stator 21 to prevent reverse rotation of the rotor 31 and the shaft 20. Moreover, since the magnetic flux density of the air gap 41 can be increased during the operation of the motor 2, high output and high efficiency of the compressor can be realized. The permanent magnet 33 is not essential.

  The rotor 31 has a rotor plate 35 that sandwiches the permanent magnet 33 in cooperation with the back yoke 34. The rotor plate 35 is made of a magnetic material, and is provided with a slit 35 a that magnetically insulates between the adjacent magnetic poles of the permanent magnet 33. The slits 35a extend radially outward from the center of the rotor plate 35 in the radial direction. Since the slit 35a is provided only in the rotor plate 35 and not in the back yoke 34, the slit 35a has a passage through which refrigerant and lubricating oil are actively passed from the lower side to the upper side of the rotor 31. Must not. With this configuration, the area of the rotor core facing the air gap 41 is increased, so that the flux linkage can be increased. Further, since the demagnetizing field is not directly applied to the permanent magnet 33, the demagnetization resistance is also increased. Further, when the permanent magnet 33 is a sintered rare earth magnet or the like, the high-frequency component of the magnetic flux is difficult to reach inside the permanent magnet 33. Therefore, by suppressing the generation of eddy current inside the magnet, loss reduction, and Also, the temperature rise can be reduced. The rotor plate 35 is not essential.

  The rotor 31 has a rotor inner passage 31 a penetrating along the axis of the shaft 20 in the vicinity of the shaft 20. The rotor inner passage 31 a has a hole 35 c provided in the rotor plate 35 and a hole 34 c provided in the back yoke 34. Here, the vicinity of the shaft 20 is the vicinity of the inner diameter of the rotor 31, and is generally an inner portion in the axial direction with respect to the permanent magnet 33. That is, the rotor 31 and the stator 21 are on the inner peripheral side from the portion where the magnetic flux is exchanged through the air gap 41 and as a result torque is generated. However, if it is near the inner diameter of the rotor 31, the rotor inner passage 31a may be provided in the portion between the magnet passages.

  Specifically, the hole portion 35 c that also serves as a hole through which the shaft 20 is inserted is provided in the central portion of the rotor plate 35. A hole through which the shaft 20 is inserted is provided at the center of the back yoke 34, and a plurality of the holes 34c are provided at regular intervals around the shaft insertion hole. Here, the rotor plate 35 is desirably magnetically independent from the shaft 20 that is a magnetic material. This is to prevent the four-pole magnetic field appearing on the surface of the rotor plate 35 from being weakened by the short circuit of the magnetic flux through the shaft 20. This is not the case when the shaft 20 is a nonmagnetic material. In this case, the gap between the shaft 20 and the rotor plate 35 is also a part of the hole area.

  The permanent magnet 33 has an inter-magnet passage 33a that communicates with the stator inner passage 21a and the rotor inner passage 31a through the air gap 41 and extends in the radial direction and opens to the outer periphery. Specifically, the permanent magnet 33 has a plurality of magnets having one magnetic pole, and the plurality of magnets are arranged so that the magnetic poles are alternately different in the circumferential direction of the shaft 20. The intermagnet passage 33a is formed between the adjacent magnets.

  The term “communication” used herein refers to a state in which refrigerant and lubricating oil can sequentially pass through the respective passages. That is, there is clearly nothing between them in which refrigerant and lubricating oil are disturbed. For example, the entrance of the passage is not blocked by iron or resin.

  As shown in FIG. 2, the opening area of the rotor inner passage 31 a on the air gap 41 side circumscribes the opening of the stator inner passage 21 a on the air gap 41 side, and is concentric with the shaft 20. Of these, it is smaller than the virtual air gap area which is the area of the portion in the air gap 41.

  More specifically, the rotor inner passage 31a has an opening surface 31d that opens to the air gap 41 side and extends in a direction perpendicular to the axis of the shaft 20. That is, the area of the opening surface 31d is the opening area on the air gap 41 side of the rotor inner passage 31a.

  On the other hand, the air gap 41 has a virtual air gap surface 41d that is in contact with the radially outer side of the stator inner passage 21a and extends in the circumferential direction around the axis of the shaft 20 (indicated by a phantom line). That is, the area of the virtual air gap surface 41d is the virtual air gap area. The virtual air gap surface 41d may include all the holes 25c and circumscribe at least one of the holes 25c.

  More specifically, as shown in FIG. 3A, the area of the virtual air gap surface 41d circumscribes the opening on the air gap 41 side of the stator inner passage 21a and is concentric with the shaft 20 on the stator side virtual circumscribed circle. As shown in FIG. 2, it is a value (πD × L) obtained by multiplying the axial length L of the air gap 41 and the circumference ratio π, as shown in FIG. Note that the stator side virtual circumscribed circle Cs may include all the hole portions 25c and circumscribe at least one of the hole portions 25c.

  When the rotor plate 35 is not provided, the opening surface 31d refers to a portion that opens to the air gap 41 side of a hole 34c provided in the back yoke 34. The opening surface 31d should not be blocked by the permanent magnet 33. Similarly, when there is no stator plate 25, it refers to a portion of the hole 24c provided in the base 24a that opens to the air gap 41 side. The term “opening” as used herein includes not being blocked by a coil or the like. Further, even if neither or either of the rotor plate 35 and the stator plate 25 is present, the area of the virtual air gap surface 41d is the sum of the areas of the spaces that physically exist between the stator 21 and the rotor 31. It is.

  When there is the inter-magnet passage 33a, the air gap 41 can be used as a passage for letting the lubricating oil fly to the outer peripheral side of the rotor 31 by the centrifugal force of the rotor 31, as will be described later. Usually, it is desirable to make the air gap 41 magnetically small, and it may be difficult to make the virtual air gap area larger than the rotor inner passage 31a area. In this case, the cross-sectional area of the passage formed by combining the inter-magnet passage 33a and the air gap 41 can be set as the virtual air gap area and larger than the area of the rotor inner passage 31a.

  In this configuration, since the coil 23 can be inserted into the protrusion 24b after being wound and shaped in advance in a predetermined shape, it is possible to arrange the coil 23 without any gap and improve the space factor. Although it is excellent in a certain point, when the coils 23 are not in contact with each other and there is a gap between the coils 23, this gap can also be grasped as a virtual air gap area. The effect of scattering the lubricating oil 8 on the outer periphery using the centrifugal force generated by the rotation of 31 is reduced.

  3A and 4A, the stator-side virtual circumcircle Cs circumscribes the opening on the air gap 41 side of the rotor inner passage 31a and is concentric with the shaft 20 on the rotor-side virtual circumcircle circle Cr. Bigger than.

  It is more preferable that the stator side virtual inscribed circle that is inscribed in the opening on the air gap 41 side of the stator inner passage 21a and is concentric with the shaft 20 is larger than the rotor side virtual circumscribed circle Cr. is there. Since the rotor inner passage 31a does not exist linearly with respect to the stator inner passage 21a, the lubricating oil 8 rising through the stator inner passage 21a once hits the rotor 31 and adheres to the rotor 31. Since centrifugal force causes the rotor 31 to be blown to the outer peripheral side, the amount of the lubricating oil 8 passing through the rotor inner passage 31a can be further reduced.

  As shown in FIG. 2, the stator 21 has a stator outer passage 21e provided on the sealed container 1 side, and the rotor 31 has a rotor outer passage 31e provided on the sealed container 1 side. Have. The opening area of the rotor outer passage 31e on the air gap 41 side is smaller than the opening area of the stator outer passage 21e on the air gap 41 side.

  Specifically, the area of the gap Ar between the rotor 31 and the sealed container 1 on the facing surface 31b of the rotor 31 facing the stator 21 is the facing surface of the stator 21 facing the rotor 31. It is smaller than the area of the gap As between the stator 21 and the sealed container 1 in 21b. The facing surface 31 b of the rotor 31 is one surface of the rotor plate 35. The facing surface 21 b of the stator 21 is one surface of the stator plate 25. The rotor outer passage 31e is a gap Ar between the rotor 31 and the sealed container 1, and the stator outer passage 21e is a gap As between the stator 21 and the sealed container 1.

  The opposed surface 31b of the rotor 31 facing the stator 21 and the opposed surface 21b of the stator 21 facing the rotor 31 are substantially circular and the opposed surface of the rotor 31 facing the stator 21. The outer diameter Dr of 31b is larger than the outer diameter Ds of the opposing surface 21b facing the rotor 31 of the stator 21. That is, the outer diameter Dr of one surface of the rotor plate 35 is larger than the outer diameter Ds of one surface of the stator plate 25.

  As shown in FIG. 5A, when the stator plate 25 is in contact with the sealed container 1 for fixing, the outer diameter Ds of the stator plate 25 excludes this contact portion. However, even if the contact portion of the stator plate 25 with the sealed container 1 is large, the opening area of the rotor outer passage 31e on the air gap 41 side is larger than that on the air gap 41 side of the stator outer passage 21e. It is required to be smaller than the opening area. This is because the lubricating oil 8 is guided to the stator outer passage 21e by reducing the flow resistance of the stator outer passage 21e. The area of the gap between the base 24a and the sealed container 1 is desirably at least equal to or equivalent to the area of the gap between the stator plate 25 and the sealed container 1.

  Here, the stator outer passage 21e includes a through hole 21f provided in the axial direction near the outer periphery of the stator 21, as shown in FIG. 5B. For example, the through hole 21f is provided on the outer peripheral side from the coil 23, and has a thin portion with a very small width between the through hole 21f and the outer periphery of the stator 21.

  Further, in the rotor outer passage 31e, as shown in FIG. 5C, a through-hole 31f provided in the axial direction in the vicinity of the outer periphery of the rotor 31 and a gap Ar between the rotor 31 and the hermetic container 1 including. For example, the through hole 31 f may be on the outer peripheral side from the permanent magnet 33. In particular, the stator outer passage 21e needs to have a very small thin portion between the through hole 21f and the outer periphery of the stator 21 in order to drop the lubricating oil 8 that has hit the compressor container inner wall. Since 31e allows only gaseous refrigerant to pass through, it is not necessary to make the thin portion between the through hole 31f and the outer periphery of the rotor 31 thinner than in the case of the stator 21.

  As shown in FIG. 2, the opening area of the stator outer passage 21e on the air gap 41 side is larger than the opening area of the stator inner passage 21a on the air gap 41 side. The opening area of the rotor outer passage 31e opposite to the air gap 41 is larger than the opening area of the rotor inner passage 31a opposite to the air gap 41.

  As shown in FIG. 1, the compression unit 11 includes a cylindrical main body 12 and an upper end plate 15 and a lower end plate 16 attached to upper and lower open ends of the main body 12. The shaft 20 penetrates the upper end plate 15 and the lower end plate 16 and enters the main body 12.

  A roller 13 fitted to a crankpin 17 provided on the shaft 20 is disposed inside the main body portion 12 so as to be able to revolve, and a compression action is performed by the revolving motion of the roller 13. That is, a compression chamber 14 is formed between the outer surface of the roller 13 and the inner surface of the main body portion 12.

  The sealed container 1 has a suction pipe 6 that opens to the compression chamber 14 on the low pressure side of the compression section 11 and a discharge pipe 7 that opens to the upper side (downstream side) of the motor 2. The compression unit 11 has a discharge hole 11a that opens to the motor 2 side.

  One end side of the shaft 20 is rotatably supported by the lower end plate 16 of the compression unit 11, and the other end side of the shaft 20 is rotatably supported by the stator 21.

  On the lower side in the sealed container 1, there is a lubricating oil 8 in which the lower part of the shaft 20 is immersed. The lubricating oil 8 goes up inside the shaft 20 by the rotation of the shaft 20 and lubricates the sliding portion of the compression portion 11 and the like.

  Next, the operation of the compressor will be described.

  A refrigerant is supplied from the suction pipe 6 to the compression chamber 14 of the compression unit 11, and the compression unit 11 is driven by the motor 2 to compress the refrigerant. The compressed refrigerant, together with lubricating oil, is discharged from the discharge hole 11a of the compression unit 11 into the sealed container 1, and is carried to the passage between the upper magnets of the compression unit 11 through the motor 2. It is discharged from the discharge pipe 7 to the outside of the closed container 1.

  At this time, the refrigerant mainly flows through the stator inner passage 21a and the rotor inner passage 31a in addition to the conventional outer passage on the motor 2 as shown by the solid arrows in FIG. For this reason, the differential pressure between the upstream side and the downstream side of the motor 2 can be reduced, and the pressure loss of the compressor can be reduced.

  Here, a guide may be provided to cover the stator inner passage 21a from the discharge hole 11a so as to guide more lubricating oil and refrigerant to the stator inner passage 21a than the passage on the outer peripheral side of the motor 2. This is because the passage on the outer peripheral side of the stator 21 is mainly used as a passage for returning the lubricating oil separated from the refrigerant to the lower part of the compressor container.

  On the other hand, since the area of the opening surface 31d of the rotor inner passage 31a is smaller than the area of the virtual air gap surface 41d of the air gap 41, the lubricating oil 8 is as shown by the broken arrow in FIG. It becomes easier to flow to the air gap 41 side than the rotor inner passage 31a. Further, the lubricating oil 8 adheres to the rotor 31 in the form of fine particles, is blown to the outer peripheral side of the rotor 31 by the centrifugal force of the rotor 31, is struck against the sealed container 1, and is liquefied. In this way, the lubricating oil 8 can be reliably separated from the refrigerant. (This is referred to as feature point (1-1).)

  Further, since the stator side virtual circumscribed circle Cs is larger than the rotor side virtual circumscribed circle Cr, the lubricating oil 8 from the stator inner passage 21a can be applied to the rotor 31 and adhered thereto. Thus, the lubricating oil 8 can be blown to the outer peripheral side of the rotor 31 by the centrifugal force of the rotor 31. (This is referred to as a feature point (1-2).)

  Further, since the permanent magnet 33 of the rotor 31 has the intermagnet passage 33a, the intermagnet passage 33a can be used as a passage for lubricating oil and refrigerant. Thus, the differential pressure between the upstream side and the downstream side of the motor 2 can be further reduced, and the pressure loss of the compressor can be further reduced. (This is referred to as a feature point (1-3).)

  Further, since the opening area on the air gap 41 side of the rotor outer passage 31e is smaller than the opening area on the air gap 41 side of the stator outer passage 21e, the lubricating oil 8 is fed more than the rotor outer passage 31e. Thus, the lubricant can be guided to the stator outer passage 21e, and the lubricating oil 8 can be reliably guided to the upstream side of the motor 2. (This is referred to as a feature point (1-4).)

  Further, since the outer diameter Dr of the facing surface 31 b of the rotor 31 is larger than the outer diameter Ds of the facing surface 21 b of the stator 21, the lubricating oil 8 is passed between the rotor 31 and the sealed container 1. The gap Ar can be guided to the gap As between the stator 21 and the sealed container 1, and the lubricating oil 8 can be reliably guided to the upstream side of the motor 2. (This is referred to as a feature point (1-5).)

  Moreover, since the opening area of the stator outer passage 21e on the air gap 41 side is larger than the opening area of the stator inner passage 21a on the air gap 41 side, the air gap 41 functions as a so-called centrifugal pump. Normally, the pressure on the outer diameter side (stator outer passage 21e) is higher than the inner diameter side (stator inner passage 21a). Therefore, the lubricating oil 8 can be effectively returned to the upstream (lower) space of the motor 2 by enlarging the stator outer passage 21e. Further, the area of the refrigerant passage can be effectively increased without sacrificing the magnetic path of the motor 2 at the large diameter portion, and there is an effect that oil rise prevention and differential pressure and pressure loss reduction are realized. (This is referred to as a feature point (1-6).)

  Further, since the opening area of the rotor outer passage 31e opposite to the air gap 41 is larger than the opening area of the rotor inner passage 31a opposite to the air gap 41, the rotor inner passage 31a passes through the rotor inner passage 31a and passes through the motor. The lubricating oil 8 that has been in the downstream (upper) space 2 can be effectively returned. Further, the area of the refrigerant passage can be effectively increased without sacrificing the magnetic path of the motor 2 at the large diameter portion, and there is an effect that oil rise prevention and differential pressure and pressure loss reduction are realized. (This is referred to as a feature point (1-7).)

  The refrigerant is blown to the outer peripheral side of the rotor 31 when it leaves the stator inner passage 21a, that is, when the lubricating oil 8 adheres to the rotor 31 in the form of fine particles, and by the centrifugal force of the rotor 31. The upper part (downstream) of the motor passes through the rotor outer passage 31e or from the stator inner passage 21a through the rotor inner passage 31a by being struck against the sealed container 1 and separated when the lubricating oil 8 is liquefied. Led to.

  In the present invention, each of the feature points (1-1) to (1-7) may be one by one or a plurality may be combined with each other. The feature point (1-6) and the feature point (1-7) are further improved by making the sectional area of the stator outer passage 21e larger than the sectional area of the rotor outer passage 31e.

(Second Embodiment)
FIG. 6 shows a second embodiment of the compressor of the present invention. The difference from the first embodiment will be described. In the second embodiment, the configuration of the motor is different. Since other structures are the same as those of the first embodiment, description thereof is omitted.

  The motor 2 includes a rotor 31 and a stator 21 that are arranged in order from the upstream to the downstream in the direction in which the refrigerant gas flows. The opening area on the air gap 41 side of the stator inner passage 21a circumscribes the opening on the air gap 41 side of the rotor inner passage 31a and is within the air gap 41 of the virtual cylindrical surface concentric with the shaft 20. It is smaller than the virtual air gap area which is the area of a certain part.

  Specifically, the stator inner passage 21 a has an opening surface 21 d that opens to the air gap 41 side and extends in a direction perpendicular to the axis of the shaft 20. That is, the area of the opening surface 21d is an opening area opened to the air gap 41 side of the stator inner passage 21a.

  On the other hand, the air gap 41 has a virtual air gap surface 41d that is in contact with the radially outer side of the rotor inner passage 31a and extends in the circumferential direction around the axis of the shaft 20 (indicated by a virtual line). That is, the area of the virtual air gap surface 41d is the virtual air gap area.

  Further, the rotor side virtual circumscribed circle Cr (see FIG. 4A) circumscribing the opening on the air gap 41 side of the rotor inner passage 31a and concentric with the shaft 20 is on the air gap 41 side of the stator inner passage 21a. It is larger than the stator side virtual circumscribed circle Cs (see FIG. 3A) circumscribing the opening and concentric with the shaft 20.

  The permanent magnet 33 of the rotor 31 communicates with the stator inner passage 21a and the rotor inner passage 31a through the air gap 41, and extends in the radial direction and opens to the outer periphery (see FIG. 4B). A) a passage 33a between magnets.

  When the intermagnet passage 33a is present, it can be used as a passage for letting the lubricating oil 8 fly to the outer peripheral side of the rotor 31 by the centrifugal force of the rotor 31 as described later together with the air gap 41. . Normally, it is desirable that the air gap 41 be magnetically small, and it may be difficult to make the virtual air gap area larger than the stator inner passage 21a area. In that case, the cross-sectional area of the passage formed by combining the intermagnet passage 33a and the air gap 41 can be set as a virtual air gap area, which can be larger than the area of the stator inner passage 21a.

  The opening area of the stator outer passage 21e on the air gap 41 side is smaller than the opening area of the rotor outer passage 31e on the air gap 41 side. That is, the area of the gap As between the stator 21 and the sealed container 1 on the facing surface 21b of the stator 21 facing the rotor 31 is the rotor on the facing surface 31b of the rotor 31 facing the stator 21. It is smaller than the area of the gap Ar between 31 and the sealed container 1.

  The opposed surface 31b of the rotor 31 that faces the stator 21 and the opposed surface 21b of the stator 21 that faces the rotor 31 are substantially circular, and the opposed surface of the stator 21 that faces the rotor 31. The outer diameter Ds of 21b is larger than the outer diameter Dr of the opposing surface 31b facing the stator 21 of the rotor 31.

  When the stator plate 25 is in contact with the sealed container 1 for fixing, the outer diameter Ds of the stator plate 25 excludes this contact portion. Furthermore, the opening area of the stator outer passage 21e on the air gap 41 side is required to be smaller than the opening area of the rotor outer passage 31e on the air gap 41 side. This is because the lubricating oil 8 is guided to the rotor outer passage 31e by reducing the flow resistance of the rotor outer passage 31e. The same applies if the stator plate 25 is a base 24a.

  Further, there is no gap As between the stator 21 and the hermetic container 1 on the facing surface 21b of the stator 21 facing the rotor 31, and there is only a through hole in the axial direction near the outer periphery of the stator 21. Good. If the hole is provided on the inner side of the outer periphery of the rotor 31, even if the lubricating oil 8 has risen on the outer periphery of the rotor 31, the hole will contact the stator 21 and become the stator. Since the lubricating oil 8 does not rise above the upper portion 21, this is preferable.

  The opening area of the rotor outer passage 31e on the air gap 41 side is larger than the opening area of the rotor inner passage 31a on the air gap 41 side. The opening area of the stator outer passage 21e opposite to the air gap 41 is larger than the opening area of the stator inner passage 21a opposite to the air gap 41.

  According to the compressor having the above configuration, the refrigerant mainly includes the rotor inner passage 31a and the stator in addition to the conventional outer passage on the motor 2 as indicated by the solid arrow in FIG. It flows through the inner passage 21a. For this reason, the differential pressure between the upstream side and the downstream side of the motor 2 can be reduced, and the pressure loss of the compressor can be reduced.

  On the other hand, since the area of the opening surface 21d of the stator inner passage 21a is smaller than the area of the virtual air gap surface 41d of the air gap 41, the lubricating oil is as shown by the broken arrow in FIG. It becomes easier to flow to the air gap 41 side than the stator inner passage 21a. Further, the lubricating oil 8 adheres to the rotor 31 in the form of fine particles, is blown to the outer peripheral side of the rotor 31 by the centrifugal force of the rotor 31, is struck against the sealed container 1, and is liquefied. Here, since the rotor 31 is always separated from the sealed container 1 by keeping a certain distance, the liquefied lubricating oil 8 passes through the rotor outer passage 31e along the inner wall of the sealed container 1 and passes through the rotor outer passage 31e. Return to space. In this way, the lubricating oil 8 can be reliably separated from the refrigerant. (This is referred to as a feature point (2-1).)

  Further, the rotor-side virtual circumscribed circle Cr is larger than the stator-side virtual circumscribed circle Cs, so that the lubricating oil 8 from the rotor inner passage 31a is reflected against the stator 21 and reflected by the rotor 31. Can adhere to. Thus, the lubricating oil 8 can be blown to the outer peripheral side of the rotor 31 by the centrifugal force of the rotor 31. (This is referred to as a feature point (2-2).)

  Further, since the permanent magnet 33 of the rotor 31 has the inter-magnet passage 33a, the inter-magnet passage 33a can be used for the lubricating oil 8 and the refrigerant passage. Thus, the lubricating oil 8 can be blown to the outer peripheral side of the rotor 31 by the centrifugal force of the rotor 31. Furthermore, if the outer peripheral portion of the stator 21 base 24a is in contact with the sealed container 1 over almost the entire periphery, and a refrigerant passage hole penetrating in the axial direction is provided near the outer peripheral portion of the stator 21 base 24a, the sealed container 1 It is possible to further prevent the lubricating oil 8 that has been struck and liquefied from going over the stator 21. (This is referred to as a feature point (2-3).)

  Further, since the opening area of the stator outer passage 21e on the air gap 41 side is smaller than the opening area of the rotor outer passage 31e on the air gap 41 side, the lubricating oil 8 is fed more than the stator outer passage 21e. Thus, the lubricating oil 8 can be reliably guided to the upstream side of the motor 2. (This is referred to as a feature point (2-4).)

  Further, since the outer diameter Ds of the facing surface 21 b of the stator 21 is larger than the outer diameter Dr of the facing surface 31 b of the rotor 31, the lubricating oil 8 is passed between the stator 21 and the sealed container 1. The gap As can be guided to the gap Ar between the rotor 31 and the sealed container 1, and the lubricating oil 8 can be reliably guided to the upstream side of the motor 2. (This is referred to as a feature point (2-5).)

  Further, since the opening area of the rotor outer passage 31e on the air gap 41 side is larger than the opening area of the rotor inner passage 31a on the air gap 41 side, the air gap 41 functions as a so-called centrifugal pump. Normally, the pressure on the outer diameter side (rotor outer passage 31e) is higher than the inner diameter side (rotor inner passage 31a). Therefore, by increasing the rotor outer passage 31e, the lubricating oil 8 can be effectively returned to the upstream (lower) space of the motor 2. Further, the area of the refrigerant passage can be effectively increased without sacrificing the magnetic path of the motor 2 at the large diameter portion, and there is an effect that oil rise prevention and differential pressure and pressure loss reduction are realized. (This is referred to as a feature point (2-6).)

  Since the opening area of the stator outer passage 21e opposite to the air gap 41 is larger than the opening area of the stator inner passage 21a opposite to the air gap 41, the stator 2 passes through the stator inner passage 21a. Lubricating oil 8 that has fallen into the downstream (upper) space can be effectively returned. Further, the area of the refrigerant passage can be effectively increased without sacrificing the magnetic path of the motor 2 at the large diameter portion, and there is an effect that oil rise prevention and differential pressure and pressure loss reduction are realized. In particular, when a bearing is provided above the stator 21 or the stator 21 so as to have a so-called dual support structure, the lubricating oil 8 rises into the upper space of the motor 2 in order to supply oil to the bearing. Suitable for returning through 21e. (This is referred to as a feature point (2-7).)

  The refrigerant is blown to the outer peripheral side of the stator 21 by the time when it exits from the rotor inner passage 31a, that is, when the lubricating oil 8 adheres to the stator 21 in the form of fine particles, and by the centrifugal force of the stator 21. The upper portion of the motor 2 (downstream) passes through the stator outer passage 21e or from the rotor inner passage 31a through the stator inner passage 21a. ).

  In the present invention, each of the feature points (2-1) to (2-7) may be one by one or a plurality may be combined with each other. The feature point (2-6) and the feature point (2-7) are further improved by making the cross-sectional area of the rotor outer passage 31e larger than the cross-sectional area of the stator outer passage 21e.

(Third embodiment)
FIG. 7 shows a third embodiment of the compressor of the present invention. The difference from the first embodiment will be described. In the third embodiment, the configuration of the motor is different. Since other structures are the same as those of the first embodiment, description thereof is omitted.

  The motor 2 includes a first rotor 31, a stator 21, and a second rotor 32 that are arranged in order from the upstream to the downstream in the direction in which the refrigerant gas flows. Thus, since the motor 2 includes the two rotors 31 and 32 and the single stator 21, the magnetic flux of the rotors 31 and 32 can be doubled, the yoke of the stator 21 can be eliminated, and the thrust force can be increased. Can be balanced.

  Since the stator 21 generates magnetic flux in the axial direction, the magnetic poles of the permanent magnets 33 of the first rotor 31 and the permanent magnets 33 of the second rotor 32 facing each other through the stator 21 are used. A magnetic pole has the opposite polarity.

  A first air gap 41 is provided between the stator 21 and the first rotor 31. A second air gap 42 is provided between the stator 21 and the second rotor 32. With this configuration, since the suction forces acting on the first rotor 31 and the second rotor 32 cancel each other, the axial force applied to the shaft 20 can be reduced, so that the life of the bearing can be extended, Further, vibration and noise due to axial force can be suppressed.

  The first rotor 31 has a first rotor inner passage 31 a penetrating along the axis of the shaft 20 in the vicinity of the shaft 20. The stator 21 has a stator inner passage 21 a penetrating along the axis of the shaft 20 in the vicinity of the shaft 20. The second rotor 32 has a second rotor inner passage 32 a penetrating along the axis of the shaft 20 in the vicinity of the shaft 20.

  The opening area of the stator inner passage 21a on the first air gap 41 side circumscribes the opening of the first rotor inner passage 31a on the first air gap 41 side and is concentric with the shaft 20. Is smaller than the first virtual air gap area which is the area of the portion in the first air gap 41 of the virtual cylindrical surface.

  Specifically, the stator inner passage 21 a has an opening surface 21 d that opens to the first air gap 41 side and extends in a direction perpendicular to the axis of the shaft 20. That is, the area of the opening surface 21d is an opening area opened to the first air gap 41 side of the stator inner passage 21a.

  On the other hand, the first air gap 41 is in contact with the radially outer side of the first rotor inner passage 31a and extends in the circumferential direction around the axis of the shaft 20 (indicated by a phantom line). It has an air gap surface 41d. That is, the area of the first virtual air gap surface 41d is the first virtual air gap area.

  The opening area of the second rotor inner passage 32a on the second air gap 42 side circumscribes the opening of the stator inner passage 21a on the second air gap 42 side and is concentric with the shaft 20. It is smaller than the 2nd virtual air gap area which is the area of the part in the said 2nd air gap 42 among the 2nd virtual cylindrical surfaces.

  More specifically, the second rotor inner passage 32a has an opening surface 32d that opens toward the second air gap 42 and extends in a direction perpendicular to the axis of the shaft 20. That is, the area of the opening surface 32d is the opening area on the second air gap 42 side of the second rotor inner passage 32a.

  On the other hand, the second air gap 42 is in contact with the radially outer side of the stator inner passage 21a and extends in the circumferential direction around the axis of the shaft 20 (indicated by a phantom line). 42d. That is, the area of the second virtual air gap surface 42d is the second virtual air gap area.

  A first rotor-side virtual circumscribed circle Cr (see FIG. 4A) circumscribing the opening on the first air gap 41 side of the first rotor inner passage 31a and concentric with the shaft 20 is formed on the inner side of the stator. It circumscribes the opening of the passage 21a on the first air gap 41 side and is larger than the stator side virtual circumscribed circle Cs (see FIG. 3A) concentric with the shaft 20.

  Further, the stator side virtual circumscribed circle Cs (see FIG. 3A) circumscribing the opening on the second air gap 42 side of the stator inner passage 21a and concentric with the shaft 20 is formed on the second rotor inner passage 32a. It circumscribes the opening on the second air gap 42 side and is larger than the second rotor-side virtual circumscribed circle Cr (see FIG. 4A) concentric with the shaft 20.

  The permanent magnet 33 of the first rotor 31 communicates with the first rotor inner passage 31a and the stator inner passage 21a via the first air gap 41 and extends in the radial direction. And an intermagnet passage 33a (see FIG. 4B) that opens to the outer periphery.

  The permanent magnet 33 of the second rotor 32 communicates with the stator inner passage 21a and the second rotor inner passage 32a through the second air gap 42 and extends in the radial direction. And an intermagnet passage 33a (see FIG. 4B) that opens to the outer periphery.

  When there is the intermagnet passage 33a, the lubricant 31 is applied to the rotor 31 by centrifugal force of the rotors 31 and 32 as described later together with the first air gap 41 or the second air gap 42. , 32 can be used as a passage for flying to the outer peripheral side. Usually, the air gaps 41 and 42 are desirably magnetically small, and it is difficult to make the virtual air gap area larger than the area of the second rotor inner passage 32a or the stator inner passage 21a. There is. In this case, the cross-sectional area of the passage formed by combining the intermagnet passage 33a and the first air gap 41 or the second air gap 42 is the virtual air gap area, and the area of the second rotor inner passage 32a or the inner side of the stator It can be made larger than the area of the passage 21a.

  The opening area of the stator outer passage 21e on the first air gap 41 side is smaller than the opening area of the first rotor outer passage 31e on the first air gap 41 side. That is, the area of the gap As between the stator 21 and the sealed container 1 on the facing surface 21 b of the stator 21 facing the first rotor 31 faces the stator 21 of the first rotor 31. It is smaller than the area of the gap Ar between the first rotor 31 and the sealed container 1 on the facing surface 31b.

  The opening area of the second rotor outer passage 32e on the second air gap 42 side is smaller than the opening area of the stator outer passage 21e on the second air gap 42 side. That is, the area of the clearance Ar between the second rotor 32 and the sealed container 1 on the facing surface 32b of the second rotor 32 facing the stator 21 is the second rotor 32 of the stator 21. Is smaller than the area of the gap As between the stator 21 and the sealed container 1 on the facing surface 21c.

  The opposed surface 31b of the first rotor 31 facing the stator 21 and the opposed surface 21b of the stator 21 facing the first rotor 31 are substantially circular, and the stator 21 The outer diameter Ds of the facing surface 21 b facing the first rotor 31 is larger than the outer diameter Dr of the facing surface 31 b of the first rotor 31 facing the stator 21.

  The opposed surface 32 b of the second rotor 32 facing the stator 21 and the opposed surface 21 c of the stator 21 facing the second rotor 32 are substantially circular, and the second rotor 32. The outer diameter Dr of the facing surface 32b facing the stator 21 is larger than the outer diameter Ds of the facing surface 21c of the stator 21 facing the second rotor 32.

  The opening area of the first rotor outer passage 31e on the first air gap 41 side is larger than the opening area of the first rotor inner passage 31a on the first air gap 41 side. Furthermore, the opening area of the stator outer passage 21e on the second air gap 42 side is larger than the opening area of the stator inner passage 21a on the second air gap 42 side.

  The opening area of the second rotor outer passage 32e opposite to the second air gap 42 is larger than the opening area of the second rotor inner passage 32a opposite to the second air gap 42. large.

  According to the compressor having the above-described configuration, the refrigerant mainly includes the first rotor inner passage 31a, the stator inner passage 21a, and the second passage in addition to the conventional outer peripheral passage of the motor 2. It flows through the rotor inner passage 32a. For this reason, the differential pressure between the upstream side and the downstream side of the motor 2 can be reduced, and the pressure loss of the compressor can be reduced.

  On the other hand, since the area of the opening surface 21d of the stator inner passage 21a is smaller than the area of the virtual air gap surface 41d of the first air gap 41, the lubricating oil 8 is larger than the stator inner passage 21a. It becomes easy to flow to the first air gap 41 side. Further, the lubricating oil 8 adheres to the first rotor 31 in the form of fine particles, and is blown to the outer peripheral side of the first rotor 31 by the centrifugal force of the first rotor 31, so that the sealed container 1 Bumps and liquefies. Thus, the lubricating oil 8 can be reliably separated from the refrigerant in the first air gap 41. (This is referred to as a feature point (3-1).)

  Further, since the area of the opening surface 32d of the second rotor inner passage 32a is smaller than the area of the virtual air gap surface 42d of the second air gap 42, the lubricating oil 8 It becomes easier to flow to the second air gap 42 side than the rotor inner passage 32a. Further, the lubricating oil 8 adheres to the second rotor 32 in the form of fine particles, and is blown to the outer peripheral side of the second rotor 32 by the centrifugal force of the second rotor 32, so that the sealed container 1 Bumps and liquefies. Thus, the lubricating oil 8 can be reliably separated from the refrigerant in the second air gap 42. (This is referred to as a feature point (3-2).)

  Further, since the first rotor side virtual circumscribed circle Cr is larger than the stator side virtual circumscribed circle Cs on the first air gap 41 side, the lubricating oil 8 from the first rotor inner passage 31a. Can be reflected on the stator 21 and reflected to the first rotor 31. Thus, the lubricating oil 8 can be blown to the outer peripheral side of the first rotor 31 by the centrifugal force of the first rotor 31. (This is referred to as a feature point (3-3).)

  Further, the stator side virtual circumscribed circle Cs on the second air gap 42 side is larger than the second rotor side virtual circumscribed circle Cr, so that the lubricating oil 8 from the stator inner passage 21a is used as the above. It can adhere to the second rotor 32. The lubricating oil 8 can be blown to the outer peripheral side of the second rotor 32 by the centrifugal force of the second rotor 32. (This is referred to as a feature point (3-4).)

  Further, since the permanent magnet 33 of the first rotor 31 has the intermagnet passage 33a, the intermagnet passage 33a can be used for the lubricating oil 8 and the refrigerant passage. Thus, the lubricating oil 8 can be blown to the outer peripheral side of the first rotor 31 by the centrifugal force of the first rotor 31. (This is referred to as a feature point (3-5).)

  Further, since the permanent magnet 33 of the second rotor 32 has the inter-magnet passage 33a, the inter-magnet passage 33a can be used for the lubricating oil 8 and the refrigerant passage. Thus, the differential pressure between the upstream side and the downstream side of the motor 2 can be further reduced, and the pressure loss of the compressor can be further reduced. (This is referred to as a feature point (3-6).)

  Further, since the opening area of the stator outer passage 21e on the first air gap 41 side is smaller than the opening area of the first rotor outer passage 31e on the first air gap 41 side, the lubricating oil 8 Can be guided to the first rotor outer passage 31e rather than the stator outer passage 21e, and the lubricating oil 8 can be reliably guided to the upstream side of the motor 2. (This is referred to as a feature point (3-7).)

  Further, since the opening area of the second rotor outer passage 32e on the second air gap 42 side is smaller than the opening area of the stator outer passage 21e on the second air gap 42 side, the lubricating oil 8 Can be guided to the stator outer passage 21e rather than the second rotor outer passage 32e, and the lubricating oil 8 can be reliably guided to the upstream side of the motor 2. (This is referred to as a feature point (3-8).)

  Further, since the outer diameter Ds of the facing surface 21b of the stator 21 is larger than the outer diameter Dr of the facing surface 31b of the first rotor 31, the lubricating oil 8 is supplied to the stator 21 and the sealed container 1. Can be guided to the gap Ar between the first rotor 31 and the sealed container 1 rather than the gap As between the first and second rotors 31, and the lubricating oil 8 can be reliably guided to the upstream side of the motor 2. it can. (This is referred to as a feature point (3-9).)

  Further, since the outer diameter Dr of the facing surface 32b of the second rotor 32 is larger than the outer diameter Ds of the facing surface 21c of the stator 21, the lubricating oil 8 is mixed with the second rotor 32 and the above It is possible to guide the lubricating oil 8 to the upstream side of the motor 2 more reliably than the clearance Ar between the sealed container 1 and the clearance As between the stator 21 and the sealed container 1. it can. (This is referred to as a feature point (3-10).)

  The opening area of the first rotor outer passage 31e on the first air gap 41 side is larger than the opening area of the first rotor inner passage 31a on the first air gap 41 side. Since the first air gap 41 functions as a so-called centrifugal pump, the pressure on the outer diameter side (first rotor outer passage 31e) is usually higher than the inner diameter side (first rotor inner passage 31a). Therefore, the lubricating oil 8 can be effectively returned to the upstream (lower) space of the motor 2 by increasing the first rotor outer passage 31e. Further, the area of the refrigerant passage can be effectively increased without sacrificing the magnetic path of the motor 2 at the large diameter portion, and there is an effect that oil rise prevention and differential pressure and pressure loss reduction are realized. (This is referred to as a feature point (3-11).)

  Further, since the opening area of the stator outer passage 21e on the second air gap 42 side is larger than the opening area of the stator inner passage 21a on the second air gap 42 side, the second air gap 42 is provided. Since it has the function of a so-called centrifugal pump, the pressure on the outer diameter side (stator outer passage 21e) is usually higher than the inner diameter side (stator inner passage 21a). Therefore, the lubricant can be effectively returned to the upstream (lower) space of the motor 2 by increasing the stator outer passage 21e. Further, the area of the refrigerant passage can be effectively increased without sacrificing the magnetic path of the motor 2 at the large diameter portion, and there is an effect that oil rise prevention and differential pressure and pressure loss reduction are realized. (This is referred to as a feature point (3-12).)

  The opening area of the second rotor outer passage 32e opposite to the second air gap 42 is larger than the opening area of the second rotor inner passage 32a opposite to the second air gap 42. Since it is large, the lubricating oil 8 that has risen in the downstream (upper) space of the motor 2 can be effectively returned through the second rotor inner passage 32a. Further, the area of the refrigerant passage can be effectively increased without sacrificing the magnetic path of the motor 2 at the large diameter portion, and there is an effect that oil rise prevention and differential pressure and pressure loss reduction are realized. (This is referred to as a feature point (3-13).)

  In the present invention, each of the feature points (3-1) to (3-13) may be one by one or a plurality may be combined with each other. The characteristic points (3-11) to (3-13) are such that the cross-sectional area of the first rotor outer passage 31e is larger than the cross-sectional area of the stator outer passage 21e, or the outer side of the stator This is further improved by making the cross-sectional area of the passage 21e larger than the cross-sectional area of the second rotor outer passage 32e.

(Fourth embodiment)
FIG. 8 shows a fourth embodiment of the compressor of the present invention. The difference from the first embodiment will be described. In the fourth embodiment, the configuration of the motor is different. Since other structures are the same as those of the first embodiment, description thereof is omitted.

  The motor 2 includes a first stator 21, a rotor 31, and a second stator 22 that are arranged in order from the upstream to the downstream in the direction in which the refrigerant gas flows. Thus, since the motor 2 includes the two stators 21 and 22 and the single rotor 31, the interlinkage magnetic flux of the stators 21 and 22 can be doubled, both surfaces of the rotor 31 can be used, and the thrust is further increased. Balance the power.

  The first stator 21 and the second stator 22 are wound so that opposite polarities are generated at positions facing each other via the rotor 31. That is, coils of the same phase and wound in the same direction when viewed from one direction are provided. In addition, the first stator 21 on the upstream side has increased ampere turns compared to the second stator 22 on the downstream side. For example, the number of turns is changed with the same wire diameter. In this case, for example, if connected in series, the current is the same and the number of turns is different. Therefore, the ampere turn of the first stator 21 is larger, and the rotor 31 is strongly attracted by the first stator 21. It becomes. The rotor plates 35 are provided on both sides of the permanent magnet 33 of the rotor 31.

  A first air gap 41 is provided between the rotor 31 and the first stator 21. A second air gap 42 is provided between the rotor 31 and the second stator 22. With this configuration, since the suction forces acting on both sides of the rotor 31 cancel each other, the axial force applied to the shaft 20 can be reduced, so that the life of the bearing can be extended, and vibration due to the axial force can be increased. And can suppress noise.

  The first stator 21 has a first stator inner passage 21 a penetrating along the axis of the shaft 20 in the vicinity of the shaft 20. The rotor 31 has a rotor inner passage 31 a penetrating along the axis of the shaft 20 in the vicinity of the shaft 20. The second stator 22 has a second stator inner passage 22 a penetrating along the axis of the shaft 20 in the vicinity of the shaft 20.

  The opening area of the rotor inner passage 31a on the first air gap 41 side circumscribes the opening of the first stator inner passage 21a on the first air gap 41 side and is concentric with the shaft 20. Is smaller than the first virtual air gap area which is the area of the portion in the first air gap 41 of the virtual cylindrical surface.

  Specifically, the rotor inner passage 31a has an opening surface 31d that opens toward the first air gap 41 and extends in a direction perpendicular to the axis of the shaft 20. That is, the area of the opening surface 31d is an opening area that opens to the first air gap 41 side of the rotor inner passage 31a.

  On the other hand, the first air gap 41 is in contact with the radially outer side of the first stator inner passage 21a and extends in the circumferential direction around the axis of the shaft 20 (indicated by a virtual line). It has an air gap surface 41d. That is, the area of the first virtual air gap surface 41d is the first virtual air gap area.

  The opening area of the second stator inner passage 22a on the second air gap 42 side circumscribes the opening of the rotor inner passage 31a on the second air gap 42 side and is concentric with the shaft 20. It is smaller than the 2nd virtual air gap area which is the area of the part in the said 2nd air gap 42 among the 2nd virtual cylindrical surfaces.

  More specifically, the second stator inner passage 22a has an opening surface 22d that opens toward the second air gap 42 and extends in a direction perpendicular to the axis of the shaft 20. That is, the area of the opening surface 22d is the opening area of the second stator inner passage 22a on the second air gap 42 side.

  On the other hand, the second air gap 42 is in contact with the outer side in the radial direction of the rotor inner passage 31a and extends in the circumferential direction around the axis of the shaft 20 (indicated by a phantom line). 42d. That is, the area of the second virtual air gap surface 42d is the second virtual air gap area.

  Further, a first stator side virtual circumscribed circle Cs (see FIG. 3A) circumscribing the opening of the first stator inner passage 21a on the first air gap 41 side and concentric with the shaft 20 is formed on the inner side of the rotor. It circumscribes the opening on the first air gap 41 side of the passage 31a and is larger than the rotor side virtual circumscribed circle Cr (see FIG. 4A) concentric with the shaft 20.

  Further, the rotor side virtual circumscribed circle Cr (see FIG. 4A) circumscribing the opening of the rotor inner passage 31a on the second air gap 42 side and concentric with the shaft 20 is formed on the second stator inner passage 22a. It circumscribes the opening on the second air gap 42 side and is larger than the second stator side virtual circumscribed circle Cs (see FIG. 3A) concentric with the shaft 20.

  Further, the permanent magnet 33 of the rotor 31 is passed through the rotor inner passage 31a, the first stator inner passage 21a via the first air gap 41, and the second air gap 42. And a passage 33a between magnets (see FIG. 4B) that communicates with the second inner stator passage 22a and extends in the radial direction and opens to the outer periphery.

  When there is the intermagnet passage 33 a, the lubricating oil 8 is mixed with the first air gap 41 or the second air gap 42 and the outer periphery of the rotor 31 by the centrifugal force of the rotor 31 as described later. It can be a passage for flying to the side. Usually, the air gaps 41 and 42 are desirably magnetically small, and it is difficult to make the virtual air gap area larger than the area of the first stator inner passage 21a or the rotor inner passage 31a. There is. In this case, the cross-sectional area of the passage formed by combining the intermagnet passage 33a and the first air gap 41 or the second air gap 42 is defined as the virtual air gap area, and the area of the first stator inner passage 21a or the rotor inner side It can be made larger than the area of the passage 31a.

  The opening area of the rotor outer passage 31e on the first air gap 41 side is smaller than the opening area of the first stator outer passage 21e on the first air gap 41 side. That is, the area of the clearance Ar between the rotor 31 and the sealed container 1 on the facing surface 31b of the rotor 31 facing the first stator 21 faces the rotor 31 of the first stator 21. It is smaller than the area of the gap As between the first stator 21 and the sealed container 1 on the facing surface 21b.

  The opening area of the second stator outer passage 22e on the second air gap 42 side is smaller than the opening area of the rotor outer passage 31e on the second air gap 42 side. That is, the area of the gap As between the second stator 22 and the sealed container 1 on the facing surface 22b of the second stator 22 facing the rotor 31 is the second stator 22 of the rotor 31. Is smaller than the area of the gap Ar between the rotor 31 and the sealed container 1 on the facing surface 31c.

  The opposed surface 21b of the first stator 21 that faces the rotor 31 and the opposed surface 31b of the rotor 31 that faces the first stator 21 are substantially circular, and the rotor 31 has the first surface. The outer diameter Dr of the facing surface 31 b facing the first stator 21 is larger than the outer diameter Ds of the facing surface 21 b facing the rotor 31 of the first stator 21.

  The opposed surface 22b of the second stator 22 facing the rotor 31 and the opposed surface 31c of the rotor 31 facing the second stator 22 are substantially circular, and the second stator 22 The outer diameter Ds of the facing surface 22 b facing the rotor 31 is larger than the outer diameter Dr of the facing surface 31 c of the rotor 31 facing the second stator 22.

  When the stator plate 25 of the second stator 22 is in contact with the sealed container 1 for fixing, the outer diameter Ds of the stator plate 25 excludes this contact portion. At this time, the opening area of the second stator outer passage 22e on the second air gap 42 side is required to be smaller than the opening area of the rotor outer passage 31e on the second air gap 42 side. This is because the lubricating oil 8 is guided to the rotor outer passage 31e by reducing the flow resistance of the rotor outer passage 31e. The same applies if the stator plate 25 is a base 24a.

  Further, there is no gap between the second stator 22 and the hermetic container 1 on the facing surface 22b of the second stator 22 facing the rotor 31, and the axial direction in the vicinity of the outer periphery of the second stator 22 is present. Only the through hole penetrating through the second stator outer passage 22e may be used. If the hole is provided on the inner side of the outer periphery of the rotor 31, the second stator can be provided even if the lubricating oil 8 rises on the outer periphery of the rotor 31. Therefore, the lubricating oil 8 does not rise above the second stator 22.

  The opening area of the first stator outer passage 21e on the first air gap 41 side is larger than the opening area of the first stator inner passage 21a on the first air gap 41 side. Furthermore, the opening area of the rotor outer passage 31e on the second air gap 42 side is larger than the opening area of the rotor inner passage 31a on the second air gap 42 side.

  The opening area of the second stator outer passage 22e opposite to the second air gap 42 is larger than the opening area of the second stator inner passage 22a opposite to the second air gap 42. large.

  According to the compressor having the above-described configuration, the refrigerant mainly includes the first stator inner passage 21a, the rotor inner passage 31a, and the second passage in addition to the conventional outer passage on the motor 2. It flows through the stator inner passage 22a. For this reason, the differential pressure between the upstream side and the downstream side of the motor 2 can be reduced, and the pressure loss of the compressor can be reduced.

  On the other hand, since the area of the opening surface 31d of the rotor inner passage 31a is smaller than the area of the virtual air gap surface 41d of the first air gap 41, the lubricating oil 8 is less than the rotor inner passage 31a. It becomes easy to flow to the first air gap 41 side. Further, the lubricating oil 8 adheres to one surface of the rotor 31 (the facing surface 31b) in the form of fine particles, and is blown to the outer peripheral side of the rotor 31 by the centrifugal force of the rotor 31, and is put into the sealed container 1. Bumps and liquefies. Thus, the lubricating oil 8 can be reliably separated from the refrigerant in the first air gap 41. (This is referred to as a feature point (4-1).)

  Further, since the area of the opening surface 22d of the second stator inner passage 22a is smaller than the area of the virtual air gap surface 42d of the second air gap 42, the lubricating oil 8 It becomes easier to flow to the second air gap 42 side than the stator inner passage 22a. Furthermore, the lubricating oil 8 adheres to the other surface of the rotor 31 (the facing surface 31c) in the form of fine particles, and is blown to the outer peripheral side of the rotor 31 by the centrifugal force of the rotor 31, and the sealed container 1 Bumps and liquefies. Thus, the lubricating oil 8 can be reliably separated from the refrigerant in the second air gap 42. (This is referred to as a feature point (4-2).)

  The first stator side virtual circumscribed circle Cs is larger than the rotor side virtual circumscribed circle Cr on the first air gap 41 side, and therefore the lubricating oil 8 from the first stator inner passage 21a. Can be applied to the rotor 31. Then, the lubricating oil 8 can be blown to the outer peripheral side of the rotor 31 by the centrifugal force of the rotor 31. (This is referred to as a feature point (4-3).)

  Further, since the rotor-side virtual circumscribed circle Cr on the second air gap 42 side is larger than the second stator-side virtual circumscribed circle Cs, the lubricating oil 8 from the rotor inner passage 31 a is It can be applied to the rotor 31 by being reflected by the second stator 22. Then, the lubricating oil 8 can be blown to the outer peripheral side of the rotor 31 by the centrifugal force of the rotor 31. (This is referred to as a feature point (4-4).)

  Further, since the permanent magnet 33 of the rotor 31 has the inter-magnet passage 33a, the inter-magnet passage 33a can be used for the lubricating oil 8 and the refrigerant passage. That is, the lubricating oil 8 can be blown to the outer peripheral side of the rotor 31 by the centrifugal force of the rotor 31. (This is referred to as a feature point (4-5).)

  Further, since the opening area of the rotor outer passage 31e on the first air gap 41 side is smaller than the opening area of the first stator outer passage 21e on the first air gap 41 side, the lubricating oil 8 Can be guided to the first stator outer passage 21e rather than the rotor outer passage 31e, and the lubricating oil 8 can be reliably guided to the upstream side of the motor 2. (This is referred to as a feature point (4-6).)

  Further, since the opening area of the second stator outer passage 22e on the second air gap 42 side is smaller than the opening area of the rotor outer passage 31e on the second air gap 42 side, the lubricating oil 8 Can be guided to the rotor outer passage 31e rather than the second stator outer passage 22e, and the lubricating oil 8 can be reliably guided to the upstream side of the motor 31. (This is referred to as a feature point (4-7).)

  Further, since the outer diameter Dr of the facing surface 31b of the rotor 31 is larger than the outer diameter Ds of the facing surface 21b of the first stator 21, the lubricating oil 8 is passed between the rotor 31 and the sealed container 1. Can be guided to the gap As between the first stator 21 and the sealed container 1, and the lubricating oil 8 can be reliably guided to the upstream side of the motor 2. it can. (This is referred to as a feature point (4-8).)

  Further, since the outer diameter Ds of the facing surface 22b of the second stator 22 is larger than the outer diameter Dr of the facing surface 31c of the rotor 31, the lubricating oil 8 is mixed with the second stator 22 and the above Rather than the gap As between the sealed container 1 and the gap 31 between the rotor 31 and the sealed container 1, the lubricating oil 8 can be reliably guided to the upstream side of the motor 2. it can. (This is referred to as a feature point (4-9).)

  The opening area of the first stator outer passage 21e on the first air gap 41 side is larger than the opening area of the first stator inner passage 21a on the first air gap 41 side. Since the first air gap 41 functions as a so-called centrifugal pump, the pressure on the outer diameter side (first stator outer passage 21e) is usually higher than the inner diameter side (first stator inner passage 21a). Accordingly, the lubricating oil 8 can be effectively returned to the upstream (lower) space of the motor 2 by making the first stator outer passage 21e large. Further, the area of the refrigerant passage can be effectively increased without sacrificing the magnetic path of the motor 2 at the large diameter portion, and there is an effect that oil rise prevention and differential pressure and pressure loss reduction are realized. (This is referred to as a feature point (4-10).)

  Further, since the opening area of the rotor outer passage 31e on the second air gap 42 side is larger than the opening area of the rotor inner passage 31a on the second air gap 42 side, the second air gap 42 is provided. Since it has the function of a so-called centrifugal pump, the pressure on the outer diameter side (rotor outer passage 31e) is usually higher than the inner diameter side (rotor inner passage 31a). Therefore, the lubricant can be effectively returned to the upstream (lower) space of the motor 2 by enlarging the rotor outer passage 31e. Further, the area of the refrigerant passage can be effectively increased without sacrificing the magnetic path of the motor 2 at the large diameter portion, and there is an effect that oil rise prevention and differential pressure and pressure loss reduction are realized. (This is referred to as a feature point (4-11).)

  The opening area of the second stator outer passage 22e opposite to the second air gap 42 is larger than the opening area of the second stator inner passage 22a opposite to the second air gap 42. Since it is large, the lubricating oil 8 that has risen in the downstream (upper) space of the motor 2 can be effectively returned through the second stator inner passage 22a. Further, the area of the refrigerant passage can be effectively increased without sacrificing the magnetic path of the motor 2 at the large diameter portion, and there is an effect that oil rise prevention and differential pressure and pressure loss reduction are realized. In particular, in the case where the bearing is provided above the second stator 22 or the second stator 22 so as to have a so-called dual-support structure, the lubricating oil 8 rises in the upper space of the motor 2 in order to supply oil to the bearing. It is suitable for returning the oil 8 through the second stator outer passage 22e. (This is referred to as a feature point (4-12).)

  In the present invention, each of the feature points (4-1) to (4-12) may be one by one or a plurality may be combined with each other. The feature point (4-10) to the feature point (4-12) are such that the cross-sectional area of the first stator outer passage 21e is larger than the cross-sectional area of the rotor outer passage 31e, or the rotor outer side This is further improved by making the cross-sectional area of the passage 31e larger than the cross-sectional area of the second stator outer passage 22e.

  The second stator 22 may not be provided with a bearing, and the shaft 20 may not pass through the inside of the second stator 22, and the lubricating oil may be disposed above the second stator 22. The possibility of going up 8 can be greatly reduced. In the case of this motor 2, since the axial length of the rotor 31 is small, there is often no problem even if a bearing is not provided on the second stator 22.

(Fifth embodiment)
FIG. 9 shows a fifth embodiment of the compressor of the present invention. In the fifth embodiment, another rotor 36 is used in place of the rotor of the fourth embodiment (FIG. 8).

  In the rotor 36, permanent magnets 33 and 33 are disposed on both sides of a back yoke 34 made of a magnetic material such as iron, and a rotor plate 35 is provided on the permanent magnet 33.

  In the rotor 36, the number of the permanent magnets 33 increases, but the permanent magnets 33 can be easily fixed to the rotor 36, and the shaft 20 can be easily held. Further, it is possible to provide a skew effect by slightly shifting the magnetic pole distribution on both sides of the rotor 36.

  The rotor 36 has two poles, and the corresponding stator needs to be configured to generate a two-pole magnetic field. As an example of the stator, for example, in the stator shown in the fourth embodiment (FIG. 8), two sets of three-phase coils are provided in FIG. A stator shown in a sixth embodiment (FIG. 10) to be described later can be given.

  The magnetic poles of the permanent magnets 33 on both sides of the back yoke 34 may be the same or opposite, but depending on whether the magnetic poles on both sides are the same or opposite, the stator 21 (see, for example, FIG. 10). , 22 are arranged differently. When the magnetic poles on both sides are the same, the thickness of the back yoke 34 is important. On the other hand, when the magnetic poles on both sides are opposite, the thickness of the back yoke 34 is such that the magnetic flux passes only in the axial direction. It is enough. The intermagnet passage 33 a of the permanent magnet 33 can be a passage through which the refrigerant and the lubricating oil 8 are guided to the outer periphery of the rotor 36.

(Sixth embodiment)
FIG. 10 shows a sixth embodiment of the compressor of the present invention. In the sixth embodiment, another stator 26 is used instead of the stator of the first to fourth embodiments. Since the stator 26 has two poles, it needs to be changed to a four-pole stator when used in place of the stators of the first to fourth embodiments.

  In this stator 26, the coil 23 is so-called “distributed winding” around the iron core 24, and the interlinkage magnetic flux is large, and a plurality of phases cooperate to generate magnetic flux. Therefore, the change in magnetic flux is smooth and low. Vibration and low noise can be achieved.

  Specifically, the iron core 24 has first to sixth protrusions 24b that extend along the axis of the stator 26 and are sequentially arranged in the circumferential direction. The protrusion 24b is provided with a coil lower layer group 23A, a coil middle layer group 23B, and a coil upper layer group 23C in order from the bottom along the axis of the stator 26.

  The coil lower layer group 23A winds the coil 23 that collectively winds the first, second, and third protrusions 24b and the fourth, fifth, and sixth protrusions 24b. And a coil 23 to be used.

  The coil middle layer group 23B is configured such that the coil 23 that collectively winds the second, third, and fourth protrusions 24b and the fifth, sixth, and first protrusions 24b that are collectively wound. And a coil 23 to be used.

  The coil upper layer group 23C is formed by winding the coil 23 that collectively winds the third, fourth, and fifth protrusions 24b and the sixth, first, and second protrusions 24b. And a coil 23 to be used.

The coil lower layer group 23A is a U-phase, the coil middle layer group 23B is a V-phase, and the coil upper layer group 23C is a W-phase (which can be interchanged) to form a three-phase winding, each having a predetermined current or voltage, and A three-phase current rectified to a predetermined frequency is supplied.

(Seventh embodiment)
FIG. 11 shows a seventh embodiment of the compressor of the present invention. In the seventh embodiment, another stator 27 is used in place of the stator of the fourth embodiment. In particular, it is preferable to use the stator 27 instead of the stator shown in the third embodiment (FIG. 7) having rotors on both sides of the stator. This is because even if the stator configuration is exactly the same, the rotor can be doubled, so that the flux linkage can be doubled. Since the stator 27 has two poles, it needs to be changed to a four-pole stator when used in place of the stators of the first to fourth embodiments.

  In this stator 27, the coil 23 is so-called “toroidally wound” around the iron core 24, the circumference of the coil can be shortened, the magnetic flux can be smoothly changed, and low vibration and noise can be achieved.

  Specifically, the iron core 24 has a ring shape, and the coil 23 is wound around the ring-shaped iron core 24 in the radial direction with a predetermined spacing in the circumferential direction. The stator 27 energizes the coil 23 to generate a magnetic flux in the circumferential direction. The stator 27 cooperates with the magnetic flux generated by the adjacent coil, and a magnetic pole is formed on a portion of the iron core 24 facing the permanent magnet. Is generated.

  In addition, this invention is not limited to the above-mentioned embodiment. For example, the structure of the said compression part 11 is not restricted to a rotary, A scroll may be sufficient and it is applicable even if it is another form. If an air gap is not opened with respect to the passage between the magnets surrounded by the discharge pipe 7 and the motor 2, not only the axial gap but also a radial gap may be used in combination with the air gap. Further, only one of the rotors on both sides may be a back yoke. Further, the present invention can be applied to a motor having no magnet, such as a switched reluctance motor, within the scope of the present invention. When applied to a switched reluctance motor, if the portion provided with the permanent magnet in the above embodiment is the same member (integral) as the stator core, the rotor can be provided with saliency.

  Further, the motor 2 may be disposed in a region in a hermetically sealed container filled with a low-pressure refrigerant to be sucked into the compression unit. In this case, the compressor is a so-called low-pressure dome type. In the case of the low-pressure dome type, the refrigerant and the lubricating oil are directly discharged from the compression element. Therefore, it is necessary to sufficiently return the lubricating oil when it is sucked into the compression element. Moreover, the central axis of the said airtight container 1 may incline with respect to a horizontal surface. The same applies if the compression element is above the motor. That is, the same effect can be obtained with a compressor in which a motor is placed in an atmosphere of refrigerant and lubricating oil.

It is a longitudinal section showing a 1st embodiment of a compressor of the present invention. It is sectional drawing of the principal part expansion of a compressor. It is a top view of a stator. It is a top view of the stator except a stator plate. It is a top view of a rotor. It is a top view of the rotor except a rotor board. It is a cross-sectional view showing another stator. It is a cross-sectional view showing another stator. It is a cross-sectional view showing another rotor. It is a principal part expanded sectional view which shows 2nd Embodiment of the compressor of this invention. It is a principal part expanded sectional view which shows 3rd Embodiment of the compressor of this invention. It is a principal part expanded sectional view which shows 4th Embodiment of the compressor of this invention. It is a disassembled perspective view of another rotor. It is a disassembled perspective view of another stator. It is a perspective view of another stator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Motor 6 Intake pipe 7 Discharge pipe 8 Lubricating oil 11 Compression part 12 Main body part 13 Roller 14 Compression chamber 15 Upper end plate 16 Lower end plate 20 Shaft 21 1st stator 21a Inner channel | path 21b, 21c Opposing surface 21d Opening surface 21e Outer passage 21f Through hole 22 Second stator 22a Inner passage 22b Opposing surface 22d Opening surface 22e Outer passage 23 Coil 24 Iron core 26 Other stator 27 Another stator 31 First rotor 31a Inner passage 31b, 31c Opposing surface 31d Opening surface 31e Outer passage 31f Through hole 32 Second rotor 32a Inner passage 32b Opposing surface 32d Open surface 32e Outer passage 33 Permanent magnet 33a Intermagnet passage 34 Back yoke 36 Other rotor 41 First air gap 41d Virtual air gap surface 42 First 2 air gap 2d outer diameter H the high pressure region of the outer diameter Dr rotor of a virtual air gap surface As the stator gap Ar rotor clearance Cs stator virtual circumscribing circle Cr rotor virtual circumscribed circle Ds stator

Claims (36)

A sealed container (1);
An inner passage (21a, 22a, 31a, 32a) that is arranged in the hermetic container (1) and communicates with the air gap (41, 42) and an outer passage (21e, 22e, 31e, 32e) on the outer peripheral side. An axial gap type motor (2) having
A compression section (11) disposed in the sealed container (1) and driven by the motor (2) ;
The motor (2) includes a shaft (20), a stator (21, 22) and a rotor (31, 32) arranged along the shaft (20) and facing each other in the axial direction of the shaft (20). And
The air gap (41, 42) exists between the stator (21, 22) and the rotor (31, 32),
The inner passages (21a, 22a, 31a, 32a)
The inner periphery of the stator (21, 22) or the inside of the shaft (20) inside the stator (21, 22);
The inner periphery of the rotor (31, 32) or the inside of the shaft (20) inside the rotor (31, 32);
Formed into
The outer passages (21e, 22e, 31e, 32e)
Located on the radially outer side of the shaft (20) than the inner passage (21a, 22a, 31a, 32a),
A gap (As) between the outer periphery of the stator (21, 22) and the closed container (1), or the outer periphery of the stator (21, 22);
A compressor characterized in that it is formed in a gap (Ar) between the outer periphery of the rotor (31, 32) and the sealed container (1) . The compressor according to claim 1,
The motor (2)
A stator (21) and a rotor (31) arranged in order from upstream to downstream in the direction in which the refrigerant gas flows;
It is fixed to the rotor (31) and transmits the rotational force of the rotor (31) to the compression part (11), or is extended from the rotor (31) and held by a bearing. A shaft (20) having the function of
Between the stator (21) and the rotor (31), there is an air gap (41),
The stator (21) has, in or near the shaft (20), a stator inner passage (21a) penetrating along the axis of the shaft (20) or spirally around or inside the shaft (20). ,
The rotor (31) has a rotor inner passage (31a) penetrating along the axis of the shaft (20) in the vicinity of the shaft (20),
The opening area of the rotor inner passage (31a) on the air gap (41) side is:
Virtual air that is the area of the portion in the air gap (41) of the virtual cylindrical surface that circumscribes the opening on the air gap (41) side of the stator inner passage (21a) and concentric with the shaft (20). Than the gap area
A compressor characterized by being small. The compressor according to claim 1,
The motor (2)
A stator (21) and a rotor (31) arranged in order from upstream to downstream in the direction in which the refrigerant gas flows;
It is fixed to the rotor (31) and transmits the rotational force of the rotor (31) to the compression part (11), or is extended from the rotor (31) and held by a bearing. A shaft (20) having the function of
Between the stator (21) and the rotor (31), there is an air gap (41),
The stator (21) has, in or near the shaft (20), a stator inner passage (21a) penetrating along the axis of the shaft (20) or spirally around or inside the shaft (20). ,
The rotor (31) has a rotor inner passage (31a) penetrating along the axis of the shaft (20) in the vicinity of the shaft (20),
The stator side virtual circumcircle (Cs) circumscribing the opening on the air gap (41) side of the stator inner passage (21a) and concentric with the shaft (20) is:
Than the rotor side virtual circumcircle (Cr) circumscribing the opening on the air gap (41) side of the rotor inner passage (31a) and concentric with the shaft (20),
A compressor characterized by its large size. The compressor according to claim 1,
The motor (2)
A stator (21) and a rotor (31) arranged in order from upstream to downstream in the direction in which the refrigerant gas flows;
It is fixed to the rotor (31) and transmits the rotational force of the rotor (31) to the compression part (11), or is extended from the rotor (31) and held by a bearing. A shaft (20) having the function of
Between the stator (21) and the rotor (31), there is an air gap (41),
The stator (21) has, in or near the shaft (20), a stator inner passage (21a) penetrating along the axis of the shaft (20) or spirally around or inside the shaft (20). ,
The rotor (31) has a rotor inner passage (31a) penetrating along the axis of the shaft (20) in the vicinity of the shaft (20),
The rotor (31) has a permanent magnet (33),
The permanent magnet (33) communicates with the stator inner passage (21a) and the rotor inner passage (31a) through the air gap (41), and extends between the magnets extending in the radial direction and opening to the outer periphery. A compressor having a passage (33a). The compressor according to claim 1,
The motor (2)
A stator (21) and a rotor (31) arranged in order from upstream to downstream in the direction in which the refrigerant gas flows;
It is fixed to the rotor (31) and transmits the rotational force of the rotor (31) to the compression part (11), or is extended from the rotor (31) and held by a bearing. A shaft (20) having the function of
Between the stator (21) and the rotor (31), there is an air gap (41),
The stator (21)
A stator inner passage (21a) spirally penetrating along or around the axis of the shaft (20) in or near the shaft (20);
A stator outer passage (21e) provided on the closed container (1) side,
The rotor (31)
A rotor inner passage (31a) penetrating along the axis of the shaft (20) in the vicinity of the shaft (20);
A rotor outer passage (31e) provided on the closed container (1) side,
The compressor is characterized in that an opening area of the rotor outer passage (31e) on the air gap (41) side is smaller than an opening area of the stator outer passage (21e) on the air gap (41) side. The compressor according to claim 1,
The motor (2)
A stator (21) and a rotor (31) arranged in order from upstream to downstream in the direction in which the refrigerant gas flows;
It is fixed to the rotor (31) and transmits the rotational force of the rotor (31) to the compression part (11), or is extended from the rotor (31) and held by a bearing. A shaft (20) having the function of
Between the stator (21) and the rotor (31), there is an air gap (41),
The stator (21) has, in or near the shaft (20), a stator inner passage (21a) penetrating along the axis of the shaft (20) or spirally around or inside the shaft (20). ,
The rotor (31) has a rotor inner passage (31a) penetrating along the axis of the shaft (20) in the vicinity of the shaft (20),
The opposed surface (31b) facing the stator (21) of the rotor (31) and the opposed surface (21b) facing the rotor (31) of the stator (21) are substantially circular,
The outer diameter (Dr) of the facing surface (31b) of the rotor (31) facing the stator (21) is the outer diameter (21b) of the facing surface (21b) of the stator (21) facing the rotor (31). A compressor characterized in that it is larger than Ds). The compressor according to claim 1,
The motor (2)
A stator (21) and a rotor (31) arranged in order from upstream to downstream in the direction in which the refrigerant gas flows;
It is fixed to the rotor (31) and transmits the rotational force of the rotor (31) to the compression part (11), or is extended from the rotor (31) and held by a bearing. A shaft (20) having the function of
Between the stator (21) and the rotor (31), there is an air gap (41),
The stator (21)
A stator inner passage (21a) spirally penetrating along or around the axis of the shaft (20) in or near the shaft (20);
A stator outer passage (21e) provided on the closed container (1) side,
The rotor (31) has a rotor inner passage (31a) penetrating along the axis of the shaft (20) in the vicinity of the shaft (20),
The compressor characterized in that an opening area on the air gap (41) side of the stator outer passage (21e) is larger than an opening area on the air gap (41) side of the stator inner passage (21a). The compressor according to claim 1,
The motor (2)
A stator (21) and a rotor (31) arranged in order from upstream to downstream in the direction in which the refrigerant gas flows;
It is fixed to the rotor (31) and transmits the rotational force of the rotor (31) to the compression part (11), or is extended from the rotor (31) and held by a bearing. A shaft (20) having the function of
Between the stator (21) and the rotor (31), there is an air gap (41),
The stator (21) has, in or near the shaft (20), a stator inner passage (21a) penetrating along the axis of the shaft (20) or spirally around or inside the shaft (20). ,
The rotor (31)
A rotor inner passage (31a) penetrating along the axis of the shaft (20) in the vicinity of the shaft (20);
A rotor outer passage (31e) provided on the closed container (1) side,
An opening area of the rotor outer passage (31e) opposite to the air gap (41) is larger than an opening area of the rotor inner passage (31a) opposite to the air gap (41). Compressor. The compressor according to claim 1,
The motor (2)
A rotor (31) and a stator (21) arranged in order from upstream to downstream in the direction in which the refrigerant gas flows;
It is fixed to the rotor (31) and transmits the rotational force of the rotor (31) to the compression part (11), or is extended from the rotor (31) and held by a bearing. A shaft (20) having the function of
Between the stator (21) and the rotor (31), there is an air gap (41),
The rotor (31) has a rotor inner passage (31a) penetrating spirally around, or around, the axis of the shaft (20) in or near the shaft (20). ,
The stator (21) has a stator inner passage (21a) penetrating along the axis of the shaft (20) in the vicinity of the shaft (20),
The opening area of the stator inner passage (21a) on the air gap (41) side is:
Virtual air that is the area of the portion inside the air gap (41) of the virtual cylindrical surface that circumscribes the opening on the air gap (41) side of the rotor inner passage (31a) and concentric with the shaft (20). Than the gap area
A compressor characterized by being small. The compressor according to claim 1,
The motor (2)
A rotor (31) and a stator (21) arranged in order from upstream to downstream in the direction in which the refrigerant gas flows;
It is fixed to the rotor (31) and transmits the rotational force of the rotor (31) to the compression part (11), or is extended from the rotor (31) and held by a bearing. A shaft (20) having the function of
Between the stator (21) and the rotor (31), there is an air gap (41),
The rotor (31) has a rotor inner passage (31a) penetrating spirally around, or around, the axis of the shaft (20) in or near the shaft (20). ,
The stator (21) has a stator inner passage (21a) penetrating along the axis of the shaft (20) in the vicinity of the shaft (20),
The rotor side virtual circumcircle (Cr) circumscribing the opening on the air gap (41) side of the rotor inner passage (31a) and concentric with the shaft (20) is:
Than the stator side virtual circumcircle (Cs) circumscribing the opening on the air gap (41) side of the stator inner passage (21a) and concentric with the shaft (20),
A compressor characterized by its large size. The compressor according to claim 1,
The motor (2)
A rotor (31) and a stator (21) arranged in order from upstream to downstream in the direction in which the refrigerant gas flows;
It is fixed to the rotor (31) and transmits the rotational force of the rotor (31) to the compression part (11), or is extended from the rotor (31) and held by a bearing. A shaft (20) having the function of
Between the stator (21) and the rotor (31), there is an air gap (41),
The rotor (31) has a rotor inner passage (31a) penetrating spirally around, or around, the axis of the shaft (20) in or near the shaft (20). ,
The stator (21) has a stator inner passage (21a) penetrating along the axis of the shaft (20) in the vicinity of the shaft (20),
The rotor (31) has a permanent magnet (33),
The permanent magnet (33) communicates with the stator inner passage (21a) and the rotor inner passage (31a) through the air gap (41), and extends between the magnets extending in the radial direction and opening to the outer periphery. A compressor having a passage (33a). The compressor according to claim 1,
The motor (2)
A rotor (31) and a stator (21) arranged in order from upstream to downstream in the direction in which the refrigerant gas flows;
It is fixed to the rotor (31) and transmits the rotational force of the rotor (31) to the compression part (11), or is extended from the rotor (31) and held by a bearing. A shaft (20) having the function of
Between the stator (21) and the rotor (31), there is an air gap (41),
The rotor (31)
A rotor inner passage (31a) that spirals through or around the axis of the shaft (20) in or near the shaft (20);
A rotor outer passage (31e) provided on the closed container (1) side,
The stator (21)
A stator inner passage (21a) penetrating along the axis of the shaft (20) in the vicinity of the shaft (20);
A stator outer passage (21e) provided on the closed container (1) side,
The compressor characterized in that an opening area on the air gap (41) side of the stator outer passage (21e) is smaller than an opening area on the air gap (41) side of the rotor outer passage (31e). The compressor according to claim 1,
The motor (2)
A rotor (31) and a stator (21) arranged in order from upstream to downstream in the direction in which the refrigerant gas flows;
It is fixed to the rotor (31) and transmits the rotational force of the rotor (31) to the compression part (11), or is extended from the rotor (31) and held by a bearing. A shaft (20) having the function of
Between the stator (21) and the rotor (31), there is an air gap (41),
The rotor (31) has a rotor inner passage (31a) penetrating spirally around, or around, the axis of the shaft (20) in or near the shaft (20). ,
The stator (21) has a stator inner passage (21a) penetrating along the axis of the shaft (20) in the vicinity of the shaft (20),
The opposed surface (31b) facing the stator (21) of the rotor (31) and the opposed surface (21b) facing the rotor (31) of the stator (21) are substantially circular,
The outer diameter (Ds) of the facing surface (21b) of the stator (21) facing the rotor (31) is the outer diameter (31b) of the facing surface (31b) of the rotor (31) facing the stator (21). A compressor characterized in that it is larger than Dr). The compressor according to claim 1,
The motor (2)
A rotor (31) and a stator (21) arranged in order from upstream to downstream in the direction in which the refrigerant gas flows;
It is fixed to the rotor (31) and transmits the rotational force of the rotor (31) to the compression part (11), or is extended from the rotor (31) and held by a bearing. A shaft (20) having the function of
Between the stator (21) and the rotor (31), there is an air gap (41),
The rotor (31)
A rotor inner passage (31a) that spirals through or around the axis of the shaft (20) in or near the shaft (20);
A rotor outer passage (31e) provided on the closed container (1) side,
The stator (21) has a stator inner passage (21a) penetrating along the axis of the shaft (20) in the vicinity of the shaft (20),
The compressor characterized in that an opening area on the air gap (41) side of the rotor outer passage (31e) is larger than an opening area on the air gap (41) side of the rotor inner passage (31a). The compressor according to claim 1,
The motor (2)
A rotor (31) and a stator (21) arranged in order from upstream to downstream in the direction in which the refrigerant gas flows;
It is fixed to the rotor (31) and transmits the rotational force of the rotor (31) to the compression part (11), or is extended from the rotor (31) and held by a bearing. A shaft (20) having the function of
Between the stator (21) and the rotor (31), there is an air gap (41),
The rotor (31) has a rotor inner passage (31a) penetrating spirally around, or around, the axis of the shaft (20) in or near the shaft (20). ,
The stator (21)
A stator inner passage (21a) penetrating along the axis of the shaft (20) in the vicinity of the shaft (20);
A stator outer passage (21e) provided on the closed container (1) side,
The opening area of the stator outer passage (21e) opposite to the air gap (41) is larger than the opening area of the stator inner passage (21a) opposite to the air gap (41). Compressor. The compressor according to claim 1,
The motor (2)
A first rotor (31), a stator (21) and a second rotor (32) arranged in order from upstream to downstream in the direction in which the refrigerant gas flows;
The first rotor (31) and the second rotor (32) are fixed to the first rotor (31) and the second rotor (32) and the rotational force of the first rotor (31) and the second rotor (32) is applied to the compression section (11). A shaft (20) that transmits or is extended from the first rotor (31) and the second rotor (32) and held in a bearing, or has at least one function,
Between the stator (21) and the first rotor (31), there is a first air gap (41),
Between the stator (21) and the second rotor (32), there is a second air gap (42),
The first rotor (31) has a first rotor inner passage (31a) penetrating along the axis of the shaft (20) in the vicinity of the shaft (20),
The stator (21) has, in the vicinity of the shaft (20), a stator inner passage (21a) that spirally penetrates along or around the axis of the shaft (20).
The second rotor (32) has a second rotor inner passage (32a) penetrating along the axis of the shaft (20) in the vicinity of the shaft (20),
The opening area of the stator inner passage (21a) on the first air gap (41) side is:
The first air gap (of the first virtual cylindrical surface circumscribing the opening on the first air gap (41) side of the first rotor inner passage (31a) and concentric with the shaft (20) ( 41) than the first virtual air gap area which is the area of the portion within
Small,
Or
The opening area of the second rotor inner passage (32a) on the second air gap (42) side is:
Inside the second air gap (42) of the second virtual cylindrical surface circumscribing the opening on the second air gap (42) side of the stator inner passage (21a) and concentric with the shaft (20). Than the second virtual air gap area, which is the area of the part at
A compressor characterized by satisfying at least one of small things. The compressor according to claim 1,
The motor (2)
A first rotor (31), a stator (21) and a second rotor (32) arranged in order from upstream to downstream in the direction in which the refrigerant gas flows;
The first rotor (31) and the second rotor (32) are fixed to the first rotor (31) and the second rotor (32) and the rotational force of the first rotor (31) and the second rotor (32) is applied to the compression section (11). A shaft (20) that transmits or is extended from the first rotor (31) and the second rotor (32) and held in a bearing, or has at least one function,
Between the stator (21) and the first rotor (31), there is a first air gap (41),
Between the stator (21) and the second rotor (32), there is a second air gap (42),
The first rotor (31) has a first rotor inner passage (31a) penetrating along the axis of the shaft (20) in the vicinity of the shaft (20),
The stator (21) has, in the vicinity of the shaft (20), a stator inner passage (21a) that spirally penetrates along or around the axis of the shaft (20).
The second rotor (32) has a second rotor inner passage (32a) penetrating along the axis of the shaft (20) in the vicinity of the shaft (20),
The first rotor-side virtual circumcircle (Cr) circumscribing the opening on the first air gap (41) side of the first rotor inner passage (31a) and concentric with the shaft (20) is:
Than the stator side virtual circumcircle (Cs) circumscribing the opening on the first air gap (41) side of the stator inner passage (21a) and concentric with the shaft (20),
A compressor characterized by its large size. The compressor according to claim 1,
The motor (2)
A first rotor (31), a stator (21) and a second rotor (32) arranged in order from upstream to downstream in the direction in which the refrigerant gas flows;
The first rotor (31) and the second rotor (32) are fixed to the first rotor (31) and the second rotor (32) and the rotational force of the first rotor (31) and the second rotor (32) is applied to the compression section (11). A shaft (20) that transmits or is extended from the first rotor (31) and the second rotor (32) and held in a bearing, or has at least one function,
Between the stator (21) and the first rotor (31), there is a first air gap (41),
Between the stator (21) and the second rotor (32), there is a second air gap (42),
The first rotor (31) has a first rotor inner passage (31a) penetrating along the axis of the shaft (20) in the vicinity of the shaft (20),
The stator (21) has, in the vicinity of the shaft (20), a stator inner passage (21a) that spirally penetrates along or around the axis of the shaft (20).
The second rotor (32) has a second rotor inner passage (32a) penetrating along the axis of the shaft (20) in the vicinity of the shaft (20),
The stator side virtual circumscribed circle (Cs) circumscribing the opening on the second air gap (42) side of the stator inner passage (21a) and concentric with the shaft (20) is:
Than the second rotor-side virtual circumcircle (Cr) circumscribing the opening on the second air gap (42) side of the second rotor inner passage (32a) and concentric with the shaft (20),
A compressor characterized by its large size. The compressor according to claim 1,
The motor (2)
A first rotor (31), a stator (21) and a second rotor (32) arranged in order from upstream to downstream in the direction in which the refrigerant gas flows;
The first rotor (31) and the second rotor (32) are fixed to the first rotor (31) and the second rotor (32) and the rotational force of the first rotor (31) and the second rotor (32) is applied to the compression section (11). A shaft (20) that transmits or is extended from the first rotor (31) and the second rotor (32) and held in a bearing, or has at least one function,
Between the stator (21) and the first rotor (31), there is a first air gap (41),
Between the stator (21) and the second rotor (32), there is a second air gap (42),
The first rotor (31) has a first rotor inner passage (31a) penetrating along the axis of the shaft (20) in the vicinity of the shaft (20),
The stator (21) has, in the vicinity of the shaft (20), a stator inner passage (21a) that spirally penetrates along or around the axis of the shaft (20).
The second rotor (32) has a second rotor inner passage (32a) penetrating along the axis of the shaft (20) in the vicinity of the shaft (20),
The first rotor (31) has a permanent magnet (33),
The permanent magnet (33) communicates with the first rotor inner passage (31a) and the stator inner passage (21a) through the first air gap (41) and extends in the radial direction. A compressor having a passage (33a) between magnets opened on an outer periphery. The compressor according to claim 1,
The motor (2)
A first rotor (31), a stator (21) and a second rotor (32) arranged in order from upstream to downstream in the direction in which the refrigerant gas flows;
The first rotor (31) and the second rotor (32) are fixed to the first rotor (31) and the second rotor (32) and the rotational force of the first rotor (31) and the second rotor (32) is applied to the compression section (11). A shaft (20) that transmits or is extended from the first rotor (31) and the second rotor (32) and held in a bearing, or has at least one function,
Between the stator (21) and the first rotor (31), there is a first air gap (41),
Between the stator (21) and the second rotor (32), there is a second air gap (42),
The first rotor (31) has a first rotor inner passage (31a) penetrating along the axis of the shaft (20) in the vicinity of the shaft (20),
The stator (21) has, in the vicinity of the shaft (20), a stator inner passage (21a) that spirally penetrates along or around the axis of the shaft (20).
The second rotor (32) has a second rotor inner passage (32a) penetrating along the axis of the shaft (20) in the vicinity of the shaft (20),
The second rotor (32) has a permanent magnet (33),
The permanent magnet (33) communicates with the stator inner passage (21a) and the second rotor inner passage (32a) through the second air gap (42) and extends in the radial direction. A compressor having a passage (33a) between magnets opened on an outer periphery. The compressor according to claim 1,
The motor (2)
A first rotor (31), a stator (21) and a second rotor (32) arranged in order from upstream to downstream in the direction in which the refrigerant gas flows;
The first rotor (31) and the second rotor (32) are fixed to the first rotor (31) and the second rotor (32) and the rotational force of the first rotor (31) and the second rotor (32) is applied to the compression section (11). A shaft (20) that transmits or is extended from the first rotor (31) and the second rotor (32) and held in a bearing, or has at least one function,
Between the stator (21) and the first rotor (31), there is a first air gap (41),
Between the stator (21) and the second rotor (32), there is a second air gap (42),
The first rotor (31) is
A first rotor inner passage (31a) penetrating along the axis of the shaft (20) in the vicinity of the shaft (20);
A first rotor outer passage (31e) provided on the closed container (1) side,
The stator (21)
In the vicinity of the shaft (20), along the axis of the shaft (20), or a stator inner passage (21a) that spirally penetrates around or inside the shaft,
A stator outer passage (21e) provided on the closed container (1) side,
The second rotor (32) has a second rotor inner passage (32a) penetrating along the axis of the shaft (20) in the vicinity of the shaft (20),
The opening area of the stator outer passage (21e) on the first air gap (41) side is smaller than the opening area of the first rotor outer passage (31e) on the first air gap (41) side. A compressor characterized by that. The compressor according to claim 1,
The motor (2)
A first rotor (31), a stator (21) and a second rotor (32) arranged in order from upstream to downstream in the direction in which the refrigerant gas flows;
The first rotor (31) and the second rotor (32) are fixed to the first rotor (31) and the second rotor (32) and the rotational force of the first rotor (31) and the second rotor (32) is applied to the compression section (11). A shaft (20) that transmits or is extended from the first rotor (31) and the second rotor (32) and held in a bearing, or has at least one function,
Between the stator (21) and the first rotor (31), there is a first air gap (41),
Between the stator (21) and the second rotor (32), there is a second air gap (42),
The first rotor (31) has a first rotor inner passage (31a) penetrating along the axis of the shaft (20) in the vicinity of the shaft (20),
The stator (21)
In the vicinity of the shaft (20), along the axis of the shaft (20), or a stator inner passage (21a) that spirally penetrates around or inside the shaft,
A stator outer passage (21e) provided on the closed container (1) side,
The second rotor (32) is
A second rotor inner passage (32a) penetrating along the axis of the shaft (20) in the vicinity of the shaft (20);
A second rotor outer passage (32e) provided on the closed container (1) side,
The opening area of the second rotor outer passage (32e) on the second air gap (42) side is smaller than the opening area of the stator outer passage (21e) on the second air gap (42) side. A compressor characterized by that. The compressor according to claim 1,
The motor (2)
A first rotor (31), a stator (21) and a second rotor (32) arranged in order from upstream to downstream in the direction in which the refrigerant gas flows;
The first rotor (31) and the second rotor (32) are fixed to the first rotor (31) and the second rotor (32) and the rotational force of the first rotor (31) and the second rotor (32) is applied to the compression section (11). A shaft (20) that transmits or is extended from the first rotor (31) and the second rotor (32) and held in a bearing, or has at least one function,
Between the stator (21) and the first rotor (31), there is a first air gap (41),
Between the stator (21) and the second rotor (32), there is a second air gap (42),
The first rotor (31) has a first rotor inner passage (31a) penetrating along the axis of the shaft (20) in the vicinity of the shaft (20),
The stator (21) has, in the vicinity of the shaft (20), a stator inner passage (21a) that spirally penetrates along or around the axis of the shaft (20).
The second rotor (32) has a second rotor inner passage (32a) penetrating along the axis of the shaft (20) in the vicinity of the shaft (20),
The opposed surface (31b) of the first rotor (31) facing the stator (21) and the opposed surface (21b) of the stator (21) facing the first rotor (31) are substantially the same. Circular,
The outer diameter (Ds) of the facing surface (21b) of the stator (21) facing the first rotor (31) is the facing surface of the first rotor (31) facing the stator (21) ( The compressor characterized by being larger than the outer diameter (Dr) of 31b). The compressor according to claim 1,
The motor (2)
A first rotor (31), a stator (21) and a second rotor (32) arranged in order from upstream to downstream in the direction in which the refrigerant gas flows;
The first rotor (31) and the second rotor (32) are fixed to the first rotor (31) and the second rotor (32) and the rotational force of the first rotor (31) and the second rotor (32) is applied to the compression section (11). A shaft (20) that transmits or is extended from the first rotor (31) and the second rotor (32) and held in a bearing, or has at least one function,
Between the stator (21) and the first rotor (31), there is a first air gap (41),
Between the stator (21) and the second rotor (32), there is a second air gap (42),
The first rotor (31) has a first rotor inner passage (31a) penetrating along the axis of the shaft (20) in the vicinity of the shaft (20),
The stator (21) has, in the vicinity of the shaft (20), a stator inner passage (21a) that spirally penetrates along or around the axis of the shaft (20).
The second rotor (32) has a second rotor inner passage (32a) penetrating along the axis of the shaft (20) in the vicinity of the shaft (20),
The opposed surface (32b) of the second rotor (32) facing the stator (21) and the opposed surface (21c) of the stator (21) facing the second rotor (32) are substantially the same. Circular,
The outer diameter (Dr) of the opposing surface (32b) facing the stator (21) of the second rotor (32) is the opposing surface (facing the second rotor (32) of the stator (21) ( The compressor characterized by being larger than the outer diameter (Ds) of 21c). The compressor according to claim 1,
The motor (2)
A first rotor (31), a stator (21) and a second rotor (32) arranged in order from upstream to downstream in the direction in which the refrigerant gas flows;
The first rotor (31) and the second rotor (32) are fixed to the first rotor (31) and the second rotor (32) and the rotational force of the first rotor (31) and the second rotor (32) is applied to the compression section (11). A shaft (20) that transmits or is extended from the first rotor (31) and the second rotor (32) and held in a bearing, or has at least one function,
Between the stator (21) and the first rotor (31), there is a first air gap (41),
Between the stator (21) and the second rotor (32), there is a second air gap (42),
The first rotor (31) is
A first rotor inner passage (31a) penetrating along the axis of the shaft (20) in the vicinity of the shaft (20);
A first rotor outer passage (31e) provided on the closed container (1) side,
The stator (21)
In the vicinity of the shaft (20), along the axis of the shaft (20), or a stator inner passage (21a) that spirally penetrates around or inside the shaft,
A stator outer passage (21e) provided on the closed container (1) side,
The second rotor (32) has a second rotor inner passage (32a) penetrating along the axis of the shaft (20) in the vicinity of the shaft (20),
The opening area on the first air gap (41) side of the first rotor outer passage (31e) is the opening area on the first air gap (41) side of the first rotor inner passage (31a). Bigger than,
Or
The opening area of the stator outer passage (21e) on the second air gap (42) side is larger than the opening area of the stator inner passage (21a) on the second air gap (42) side. A compressor satisfying at least one of the above. The compressor according to claim 1,
The motor (2)
A first rotor (31), a stator (21) and a second rotor (32) arranged in order from upstream to downstream in the direction in which the refrigerant gas flows;
The first rotor (31) and the second rotor (32) are fixed to the first rotor (31) and the second rotor (32) and the rotational force of the first rotor (31) and the second rotor (32) is applied to the compression section (11). A shaft (20) that transmits or is extended from the first rotor (31) and the second rotor (32) and held in a bearing, or has at least one function,
Between the stator (21) and the first rotor (31), there is a first air gap (41),
Between the stator (21) and the second rotor (32), there is a second air gap (42),
The first rotor (31) has a first rotor inner passage (31a) penetrating along the axis of the shaft (20) in the vicinity of the shaft (20),
The stator (21) has, in the vicinity of the shaft (20), a stator inner passage (21a) that spirally penetrates along or around the axis of the shaft (20).
The second rotor (32) is
A second rotor inner passage (32a) penetrating along the axis of the shaft (20) in the vicinity of the shaft (20);
A second rotor outer passage (32e) provided on the closed container (1) side,
The opening area of the second rotor outer passage (32e) opposite to the second air gap (42) is opposite to the second air gap (42) of the second rotor inner passage (32a). The compressor characterized by being larger than the opening area on the side. The compressor according to claim 1,
The motor (2)
A first stator (21), a rotor (31) and a second stator (22) arranged in order from the upstream to the downstream in the direction in which the refrigerant gas flows;
It is fixed to the rotor (31) and transmits the rotational force of the rotor (31) to the compression part (11), or is extended from the rotor (31) and held by a bearing. A shaft (20) having the function of
Between the rotor (31) and the first stator (21), there is a first air gap (41),
Between the rotor (31) and the second stator (22), there is a second air gap (42),
The first stator (21) has a first stator inner passage (21a) penetrating along the axis of the shaft (20) in or near the shaft (20),
The rotor (31) has, in the vicinity of the shaft (20), a rotor inner passage (31a) that spirally penetrates along or around the axis of the shaft (20).
The second stator (22) is a second stator inner passage that spirally penetrates along or around the axis of the shaft (20) in or near the shaft (20). (22a)
The opening area of the rotor inner passage (31a) on the first air gap (41) side is:
The first air gap (of the first virtual cylindrical surface circumscribing the opening on the first air gap (41) side of the first stator inner passage (21a) and concentric with the shaft (20) ( 41) than the first virtual air gap area which is the area of the portion within
Small,
Or
The opening area of the second stator inner passage (22a) on the second air gap (42) side is:
Inside the second air gap (42) of the second virtual cylindrical surface that circumscribes the opening on the second air gap (42) side of the rotor inner passage (31a) and is concentric with the shaft (20). Than the second virtual air gap area, which is the area of the part at
A compressor characterized by satisfying at least one of small things. The compressor according to claim 1,
The motor (2)
A first stator (21), a rotor (31) and a second stator (22) arranged in order from the upstream to the downstream in the direction in which the refrigerant gas flows;
It is fixed to the rotor (31) and transmits the rotational force of the rotor (31) to the compression part (11), or is extended from the rotor (31) and held by a bearing. A shaft (20) having the function of
Between the rotor (31) and the first stator (21), there is a first air gap (41),
Between the rotor (31) and the second stator (22), there is a second air gap (42),
The first stator (21) has a first stator inner passage (21a) penetrating along the axis of the shaft (20) in or near the shaft (20),
The rotor (31) has, in the vicinity of the shaft (20), a rotor inner passage (31a) that spirally penetrates along or around the axis of the shaft (20).
The second stator (22) is a second stator inner passage that spirally penetrates along or around the axis of the shaft (20) in or near the shaft (20). (22a)
A first stator-side virtual circumcircle (Cs) circumscribing the opening on the first air gap (41) side of the first stator inner passage (21a) and concentric with the shaft (20) is:
Than the rotor-side virtual circumcircle (Cr) circumscribing the opening on the first air gap (41) side of the rotor inner passage (31a) and concentric with the shaft (20),
A compressor characterized by its large size. The compressor according to claim 1,
The motor (2)
A first stator (21), a rotor (31) and a second stator (22) arranged in order from the upstream to the downstream in the direction in which the refrigerant gas flows;
It is fixed to the rotor (31) and transmits the rotational force of the rotor (31) to the compression part (11), or is extended from the rotor (31) and held by a bearing. A shaft (20) having the function of
Between the rotor (31) and the first stator (21), there is a first air gap (41),
Between the rotor (31) and the second stator (22), there is a second air gap (42),
The first stator (21) has a first stator inner passage (21a) penetrating along the axis of the shaft (20) in or near the shaft (20),
The rotor (31) has, in the vicinity of the shaft (20), a rotor inner passage (31a) that spirally penetrates along or around the axis of the shaft (20).
The second stator (22) is a second stator inner passage that spirally penetrates along or around the axis of the shaft (20) in or near the shaft (20). (22a)
A rotor circumscribed circle (Cr) circumscribing the opening on the second air gap (42) side of the rotor inner passage (31a) and concentric with the shaft (20) is:
Than the second stator side virtual circumcircle (Cs) circumscribing the opening on the second air gap (42) side of the second stator inner passage (22a) and concentric with the shaft (20),
A compressor characterized by its large size. The compressor according to claim 1,
The motor (2)
A first stator (21), a rotor (31) and a second stator (22) arranged in order from the upstream to the downstream in the direction in which the refrigerant gas flows;
It is fixed to the rotor (31) and transmits the rotational force of the rotor (31) to the compression part (11), or is extended from the rotor (31) and held by a bearing. A shaft (20) having the function of
Between the rotor (31) and the first stator (21), there is a first air gap (41),
Between the rotor (31) and the second stator (22), there is a second air gap (42),
The first stator (21) has a first stator inner passage (21a) penetrating along the axis of the shaft (20) in or near the shaft (20),
The rotor (31) has, in the vicinity of the shaft (20), a rotor inner passage (31a) that spirally penetrates along or around the axis of the shaft (20).
The second stator (22) is a second stator inner passage that spirally penetrates along or around the axis of the shaft (20) in or near the shaft (20). (22a)
The rotor (31) has a permanent magnet (33),
The permanent magnet (33) passes through the rotor inner passage (31a), the first stator inner passage (21a) via the first air gap (41), and the second air. A compressor having a passage (33a) between magnets that communicates with the second stator inner passage (22a) through a gap (42) and that extends radially and opens to the outer periphery. The compressor according to claim 1,
The motor (2)
A first stator (21), a rotor (31) and a second stator (22) arranged in order from the upstream to the downstream in the direction in which the refrigerant gas flows;
It is fixed to the rotor (31) and transmits the rotational force of the rotor (31) to the compression part (11), or is extended from the rotor (31) and held by a bearing. A shaft (20) having the function of
Between the rotor (31) and the first stator (21), there is a first air gap (41),
Between the rotor (31) and the second stator (22), there is a second air gap (42),
The first stator (21) is
A first stator inner passage (21a) penetrating along the axis of the shaft (20) in or near the shaft (20);
A first stator outer passage (21e) provided on the closed container (1) side,
The rotor (31)
In the vicinity of the shaft (20), along the axis of the shaft (20), or a rotor inner passage (31a) that spirally penetrates around or inside the shaft,
A rotor outer passage (31e) provided on the closed container (1) side,
The second stator (22) is a second stator inner passage that spirally penetrates along or around the axis of the shaft (20) in or near the shaft (20). (22a)
The opening area of the rotor outer passage (31e) on the first air gap (41) side is smaller than the opening area of the first stator outer passage (21e) on the first air gap (41) side. A compressor characterized by that. The compressor according to claim 1,
The motor (2)
A first stator (21), a rotor (31) and a second stator (22) arranged in order from the upstream to the downstream in the direction in which the refrigerant gas flows;
It is fixed to the rotor (31) and transmits the rotational force of the rotor (31) to the compression part (11), or is extended from the rotor (31) and held by a bearing. A shaft (20) having the function of
Between the rotor (31) and the first stator (21), there is a first air gap (41),
Between the rotor (31) and the second stator (22), there is a second air gap (42),
The first stator (21) has a first stator inner passage (21a) penetrating along the axis of the shaft (20) in or near the shaft (20),
The rotor (31)
In the vicinity of the shaft (20), along the axis of the shaft (20), or a rotor inner passage (31a) that spirally penetrates around or inside the shaft,
A rotor outer passage (31e) provided on the closed container (1) side,
The second stator (22)
A second stator inner passage (22a) that spirals through or around the axis of the shaft (20) in or near the shaft (20);
A second stator outer passage (22e) provided on the closed container (1) side,
The opening area of the second stator outer passage (22e) on the second air gap (42) side is smaller than the opening area of the rotor outer passage (31e) on the second air gap (42) side. A compressor characterized by that. The compressor according to claim 1,
The motor (2)
A first stator (21), a rotor (31) and a second stator (22) arranged in order from the upstream to the downstream in the direction in which the refrigerant gas flows;
It is fixed to the rotor (31) and transmits the rotational force of the rotor (31) to the compression part (11), or is extended from the rotor (31) and held by a bearing. A shaft (20) having the function of
Between the rotor (31) and the first stator (21), there is a first air gap (41),
Between the rotor (31) and the second stator (22), there is a second air gap (42),
The first stator (21) has a first stator inner passage (21a) penetrating along the axis of the shaft (20) in or near the shaft (20),
The rotor (31) has, in the vicinity of the shaft (20), a rotor inner passage (31a) that spirally penetrates along or around the axis of the shaft (20).
The second stator (22) is a second stator inner passage that spirally penetrates along or around the axis of the shaft (20) in or near the shaft (20). (22a)
The opposed surface (21b) of the first stator (21) facing the rotor (31) and the opposed surface (31b) of the rotor (31) facing the first stator (21) are substantially the same. Circular,
The outer diameter (Dr) of the opposed surface (31b) of the rotor (31) facing the first stator (21) is the opposed surface of the first stator (21) facing the rotor (31) ( A compressor characterized by being larger than the outer diameter (Ds) of 21b). The compressor according to claim 1,
The motor (2)
A first stator (21), a rotor (31) and a second stator (22) arranged in order from the upstream to the downstream in the direction in which the refrigerant gas flows;
It is fixed to the rotor (31) and transmits the rotational force of the rotor (31) to the compression part (11), or is extended from the rotor (31) and held by a bearing. A shaft (20) having the function of
Between the rotor (31) and the first stator (21), there is a first air gap (41),
Between the rotor (31) and the second stator (22), there is a second air gap (42),
The first stator (21) has a first stator inner passage (21a) penetrating along the axis of the shaft (20) in or near the shaft (20),
The rotor (31) has, in the vicinity of the shaft (20), a rotor inner passage (31a) that spirally penetrates along or around the axis of the shaft (20).
The second stator (22) is a second stator inner passage that spirally penetrates along or around the axis of the shaft (20) in or near the shaft (20). (22a)
The opposed surface (22b) of the second stator (22) facing the rotor (31) and the opposed surface (31c) of the rotor (31) facing the second stator (22) are substantially the same. Circular,
The outer diameter (Ds) of the facing surface (22b) of the second stator (22) facing the rotor (31) is the facing surface of the rotor (31) facing the second stator (22) ( A compressor characterized by being larger than the outer diameter (Dr) of 31c). The compressor according to claim 1,
The motor (2)
A first stator (21), a rotor (31) and a second stator (22) arranged in order from the upstream to the downstream in the direction in which the refrigerant gas flows;
It is fixed to the rotor (31) and transmits the rotational force of the rotor (31) to the compression part (11), or is extended from the rotor (31) and held by a bearing. A shaft (20) having the function of
Between the rotor (31) and the first stator (21), there is a first air gap (41),
Between the rotor (31) and the second stator (22), there is a second air gap (42),
The first stator (21) is
A first stator inner passage (21a) penetrating along the axis of the shaft (20) in or near the shaft (20);
A first stator outer passage (21e) provided on the closed container (1) side,
The rotor (31)
In the vicinity of the shaft (20), along the axis of the shaft (20), or a rotor inner passage (31a) that spirally penetrates around or inside the shaft,
A rotor outer passage (31e) provided on the closed container (1) side,
The second stator (22) is a second stator inner passage that spirally penetrates along or around the axis of the shaft (20) in or near the shaft (20). (22a)
The opening area of the first stator outer passage (21e) on the first air gap (41) side is the opening area of the first stator inner passage (21a) on the first air gap (41) side. Bigger than,
Or
The opening area of the rotor outer passage (31e) on the second air gap (42) side is larger than the opening area of the rotor inner passage (31a) on the second air gap (42) side. A compressor satisfying at least one of the above. The compressor according to claim 1,
The motor (2)
A first stator (21), a rotor (31) and a second stator (22) arranged in order from the upstream to the downstream in the direction in which the refrigerant gas flows;
It is fixed to the rotor (31) and transmits the rotational force of the rotor (31) to the compression part (11), or is extended from the rotor (31) and held by a bearing. A shaft (20) having the function of
Between the rotor (31) and the first stator (21), there is a first air gap (41),
Between the rotor (31) and the second stator (22), there is a second air gap (42),
The first stator (21) has a first stator inner passage (21a) penetrating along the axis of the shaft (20) in or near the shaft (20),
The rotor (31) has, in the vicinity of the shaft (20), a rotor inner passage (31a) that spirally penetrates along or around the axis of the shaft (20).
The second stator (22)
A second stator inner passage (22a) that spirals through or around the axis of the shaft (20) in or near the shaft (20);
A second stator outer passage (22e) provided on the closed container (1) side,
The opening area of the second stator outer passage (22e) opposite to the second air gap (42) is opposite to the second air gap (42) of the second stator inner passage (22a). The compressor characterized by being larger than the opening area on the side.

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