JP2010065556A - Hermetic compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hermetic compressor capable of efficiently delivering a refrigerant outside a sealed vessel, by sufficiently separating from lubricating oil, while simplifying a structure. <P>SOLUTION: A delivery flow passage 90 is arranged between the inside of a scroll unit 30 and a main shaft frame 14 or a scroll unit, the main shaft frame and a body part 3 of the sealed vessel 2 so as to directly introduce the refrigerant and the lubricating oil to a stator 8 of an electric motor 6. An upper part of the stator is provided with an oil separating plate 96 for separating the lubricating oil from the refrigerant introduced from the delivery flow passage. A delivery pipe 72 for delivering the refrigerant of separating the lubricating oil outside the sealed vessel, is arranged in the body part by being positioned under the main shaft frame. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a hermetic compressor, and more particularly, to a discharge passage for refrigerant and lubricating oil.

  In this type of hermetic compressor, a scroll unit that performs a series of refrigerant suction, compression, and discharge processes is provided in a hermetic container, and lubricating oil is used for the scroll unit and the drive unit of the scroll unit. Yes. This lubricating oil functions not only as a lubricant for the sliding surface and bearings in the scroll unit, but also as a seal for the sliding surface, and is stored in the oil storage chamber at the bottom of the hermetic container for temporary cooling. It circulates in the airtight container while mixing.

By the way, if the lubricating oil that has acted as a lubricant or a seal in each part in the container is discharged from the discharge port together with the refrigerant, there is a problem that the oil rising phenomenon in the scroll unit, poor lubrication, and thermal efficiency are reduced. .
Therefore, in order to guide the lubricating oil to the oil storage chamber at the bottom of the sealed container without discharging it together with the refrigerant, an oil discharge passage or an oil discharge guide is provided on the inner wall surface of the container body, or an oil discharge pipe is installed along the inner wall surface. The provided structure is known (see Patent Documents 1, 2, and 3).

  On the other hand, the refrigerant is often discharged out of the sealed container through a discharge pipe provided at the upper part of the sealed container. When the discharge pipe is provided at the upper part of the sealed container in this way, the refrigerant is discharged from the scroll unit. A mechanism for guiding the lubricating oil and the refrigerant to the oil storage chamber at the lower part of the sealed container so as not to flow directly to the discharge pipe is required at the upper part of the scroll unit, and there is a problem that the number of parts increases and the structure tends to be complicated.

For this reason, in each of the above-mentioned patent documents, the discharge pipe is provided in the body portion of the sealed container, thereby simplifying the structure at the top of the scroll unit.
JP-A-9-287579 JP 2004-316500 A JP 2006-132419 A

  However, according to each of the above-mentioned patent documents, it is possible to reliably guide the lubricating oil and the refrigerant to the oil storage chamber at the lower part of the sealed container by providing an oil discharge passage or the like. Even if the refrigerant can be guided to the oil storage chamber, the lubricating oil and the refrigerant are not necessarily sufficiently separated, and there is a risk that the oil rising phenomenon in the scroll unit, poor lubrication, and thermal efficiency may be reduced. It is not preferable.

Further, in the case where the discharge pipe is provided in the body portion of the sealed container, there is a problem of how smoothly and efficiently the refrigerant can be discharged out of the sealed container with less interference with other components.
The present invention has been made based on the above-described circumstances, and the object of the present invention is to sufficiently separate the refrigerant from the lubricating oil and efficiently discharge the refrigerant outside the sealed container while simplifying the structure. The object is to provide a hermetic compressor.

  In order to achieve the above object, a hermetic compressor according to claim 1 includes a cylindrical body, a discharge chamber formed above the body, and a lubrication formed below the body. A sealed container having an oil storage chamber in which discharge pressure acts in the barrel, a rotary shaft extending through the barrel and supported rotatably via a bearing, and housed in the barrel and rotating A stator including a rotor that is driven by energization and rotated integrally with the rotating shaft around the rotating shaft, an armature winding that rotates the rotor around the rotor, and the stator An electric motor having a supply flow path for guiding lubricating oil to the oil storage chamber, and housed in the body portion on the upper side of the electric motor and driven by the rotating shaft to suck, compress and discharge the working fluid A compression unit for performing a series of processes, and the compression unit And a spindle frame that is disposed between the motor and the electric motor and fixes the compression unit and supports the rotating shaft via the bearing, and the compression unit, the inside of the spindle frame, and the compression Provided on at least one of the unit, the main spindle frame, and the inner wall surface of the body portion, the refrigerant compressed by the compression unit and the lubricating oil contained in the refrigerant are directly guided from the discharge chamber to the stator. A discharge passage, an oil separation plate that is provided in an upper portion of the stator and separates lubricating oil from a refrigerant guided from the discharge passage, and is provided on the trunk portion below the spindle frame, It has an oil separation plate and a discharge pipe for discharging the refrigerant that has passed through the stator to the outside of the hermetic container.

According to a second aspect of the present invention, in the hermetic compressor according to the first aspect, in the first aspect, the discharge flow path is formed inside the compression unit and the main shaft frame and between the compression unit and the main shaft frame and the side wall surface of the trunk portion. It is the path | route of the pipe provided in at least any one of these and extending to the stator.
According to a third aspect of the present invention, in the hermetic compressor according to the first or second aspect, the discharge flow path is through a path of a hole drilled in the compression unit and the spindle frame.

  According to a fourth aspect of the present invention, in the hermetic compressor according to any one of the first to third aspects, there is provided a wiring for operating the electric motor along the inner wall of the body portion, and the discharge pipe is the rotating compressor. It is characterized by being provided at a position symmetrical to the wiring across the axis.

  According to the hermetic compressor according to claim 1, the refrigerant and the lubricating oil are provided in at least one of the inside of the compression unit and the spindle frame and between the compression unit and the spindle frame and the inner wall surface of the body portion of the sealed container. A discharge flow path is provided so as to lead to the stator of the electric motor, and the refrigerant is discharged from the discharge tube provided in the body of the closed container, so that the lubricating oil and the refrigerant are directly connected to the discharge tube. It is not necessary to provide a mechanism (discharge head) for guiding the oil storage chamber below the sealed container so as not to flow in the upper part of the compression unit, the structure of the upper part of the sealed container can be simplified, and the cost can be reduced. .

Then, the refrigerant and the lubricating oil pass through not only the oil separation plate but also the stator including the armature winding, so that the refrigerant and the lubricating oil can be reliably separated, and only the refrigerant can be discharged out of the sealed container satisfactorily. it can.
According to the hermetic compressor of the second aspect, since the discharge flow path is a pipe, the refrigerant and the lubricating oil can be reliably guided to the stator of the electric motor with a simple structure.

According to the hermetic compressor of the third aspect, since the discharge flow path passes through the passages of the holes provided in the compression unit and the spindle frame, the refrigerant and the lubricating oil are surely connected to the stator of the motor with a simpler structure. The cost can be reduced at the same time.
According to the hermetic compressor according to claim 4, since the discharge pipe is provided at a position symmetrical to the wiring of the electric motor with the rotating shaft interposed therebetween, the refrigerant can be smoothly and efficiently sealed with less interference with the wiring of the electric motor. It can be discharged outside.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a longitudinal section of a hermetic compressor according to the present invention.
The compressor 1 is a scroll type compressor and is incorporated in a refrigeration circuit such as a refrigeration apparatus or a heat pump type oil feeder. The circuit includes a path through which a carbon dioxide refrigerant (hereinafter referred to as a refrigerant), which is an example of a working fluid, circulates. The compressor 1 sucks the refrigerant from the path, compresses the refrigerant, and supplies the refrigerant toward the path.

The compressor 1 includes a housing (sealed container) 2, and the body 3 of the housing 2 is airtightly fitted on the upper and lower sides by an upper lid 4 and a lower lid 5, respectively. Is sealed and a high discharge pressure is applied.
An electric motor (electric motor, hereinafter referred to as a motor) 6 is accommodated in the body 3, and a rotating shaft 12 is disposed in the motor 6. Specifically, in the motor 6, a rotor 7 having a permanent magnet is fixed to the outer peripheral side of the rotating shaft 12, and a stator 8 having an armature winding 9 is disposed on the outer peripheral side of the rotor 7. The stator 8 is fixed by press-fitting a part of the outer peripheral side to the body portion 3. Thus, when the armature winding 9 is energized, the rotor 7 rotates with the rotation of the magnetic field generated in the armature winding 9 and rotates integrally with the rotating shaft 12. Further, the upper end side of the rotary shaft 12 is rotatably supported by the spindle frame 14 via a bearing 16. The spindle frame 14 is joined and fixed to the body 3 by welding or the like.

Further, a shielding member 80 is provided on the upper portion of the motor 6 so as to be fitted on the spindle frame 14 and extend radially to the outer peripheral portion of the stator 8. By the shielding member 80, the region of the rotor 7 and the stator 8 and the region of the outer periphery of the stator 8 are partitioned.
On the other hand, the lower end side of the rotating shaft 12 is rotatably supported by the countershaft frame 18 via the bearing 20. An oil pump 22 is attached to the lower end side of the rotary shaft 12, and the pump 22 sucks lubricating oil in an oil storage chamber 23 formed inside the lower lid 5. The lubricating oil is supplied to the motor 6 and the scroll unit (compression unit) 30 from the upper end of the rotating shaft 12 through an oil passage 24 formed in the rotating shaft 12 along the axial direction. It functions as a lubricant for bearings and a seal for sliding surfaces. Further, an inlet 19 for lubricating oil is formed at an appropriate position of the frame 18, and the lubricating oil supplied to each sliding portion in the compressor 1 is stored in the oil storage chamber via the inlet 19 as will be described later. 23 is stored.

  The scroll unit 30 is disposed above the motor 6 in the body 3 and performs a series of processes of refrigerant suction, compression, and discharge. Specifically, the scroll unit 30 includes a movable scroll 52 and a fixed scroll 32, and the movable scroll 52 includes an end plate 54. The end plate 54 has a spiral wrap extending toward the end plate 34 of the fixed scroll 32. It is integrally formed. These spiral wraps cooperate with each other to form a compression chamber, and this compression chamber moves from the radially outer peripheral side of the spiral wrap toward the center by the revolving motion of the movable scroll 52 with respect to the fixed scroll 32. In doing so, the volume is reduced and the refrigerant is compressed.

In order to impart a turning motion to the movable scroll 52 described above, a boss 66 is formed on the lower surface side of the end plate 54, and this boss 66 is rotatably supported by the eccentric shaft 26 via the bearing 28. The eccentric shaft 26 is integrally formed on the upper end side of the rotary shaft 12. The rotation of the movable scroll 52 is blocked by a rotation blocking pin 68.
On the other hand, the fixed scroll 32 is fixed to the spindle frame 14, and the end plate 34 partitions the compression chamber side and the discharge chamber 60 side. Further, a discharge hole 36 communicating with the compression chamber side is formed through the end plate 34 at an appropriate position in the central portion of the fixed scroll 32.

As shown in FIG. 1, the discharge chamber 60 and the regions of the rotor 7 and the stator 8 of the motor 6 are communicated with each other by a discharge flow path 90. That is, the discharge flow path 90 is provided so as to guide the refrigerant containing lubricating oil from the discharge chamber 60 to the upper portion of the stator 8.
Specifically, the discharge flow path 90 is composed of a hole path 92 formed in the scroll unit 30 and the spindle frame 14 and a pipe 94 communicating with the path 92, and the pipe 94 penetrates the shielding member 80. The refrigerant containing the lubricating oil is directly guided to the upper part of the stator 8.

An oil separation plate 96 that separates the lubricating oil from the refrigerant guided by the discharge flow path 90 is provided at the top of the stator 8.
As a result, the refrigerant containing the lubricating oil that has reached the discharge chamber 60 from the compression chamber is separated into the refrigerant and the lubricating oil through the discharge passage 90 and the oil separation plate 96 and the stator 8.
Here, referring to FIG. 2, a cross section taken along the line AA of FIG. 1 is shown, and a top view of the oil separation plate 96 is shown.

As shown in the figure, the oil separation plate 96 is provided with a plurality of constricted holes 98 concentrically as viewed from the upper surface thereof, and the refrigerant containing lubricating oil passes through these constricted holes 98 to form a compressed refrigerant. Separated into lubricating oil.
Specifically, the refrigerant and the lubricating oil flow down not only in the oil separation plate 96 but also in the stator 8 including the armature winding 9, so that the lubricating oil adheres to the armature winding 9 and the refrigerant is surely cooled. And lubricating oil.

The body 3 is provided with a discharge pipe 72 positioned below the spindle frame 14, and the refrigerant separated from the lubricating oil is discharged outside the housing 2, that is, outside the compressor 1 through the discharge pipe 72. .
Specifically, as shown in FIG. 2 above, wiring 100 for operating the motor 6 is actually arranged along the inner surface of the side wall of the body portion 3, and the discharge pipe 72 sandwiches the rotating shaft 12. The wiring 100 is provided at a symmetrical position.

  According to the compressor 1 configured as described above, the movable scroll 52 performs a turning motion without rotating as the rotary shaft 12 rotates. This orbiting movement of the movable scroll 52 causes the refrigerant to be sucked from the outer peripheral side of the scroll unit 30 toward the inside through the suction pipe 70. When the volume of the compression chamber is reduced, the high-pressure compressed refrigerant containing the mist-like lubricating oil by stirring reaches the discharge chamber 60 through the discharge hole 36, circulates in the housing 2 through the discharge flow path 90, It is discharged out of the compressor 1 through a discharge pipe 72 provided in the body 3.

At this time, the high-pressure compressed refrigerant containing the lubricating oil is reliably separated from the lubricating oil by the oil separation plate 96 and the stator 8, and only the refrigerant is discharged out of the compressor 1 through the discharge pipe 72 and separated. Lubricating oil drops and is stored in the oil storage chamber 23 through the inlet 19 provided in the lower part of the housing 2.
Further, the lubricant supplied to the scroll unit 30 and the bearings 16, 28, etc., is changed in the direction of the substantially right angle by the oil discharge passage 84, and is a compressed refrigerant containing the lubricant passing through the discharge passage 90. In the same manner, the air flows down in the stator 8 and is led to the oil storage chamber 23 through the introduction port 19 and stored.

Incidentally, as described above, in the hermetic compressor according to the present invention, the discharge flow path 90 is provided so as to guide the refrigerant and the lubricating oil directly to the upper portion of the stator 8 of the motor 6, and the discharge pipe 72 is connected to the spindle frame 14. It is arranged at the lower part 3 so as to be located below.
Therefore, according to the hermetic compressor according to the present invention, by providing the discharge pipe 72 in the body portion 3, there is no need to provide the discharge head disposed on the top of the scroll unit 30 as in the prior art, and the housing The structure of the upper part of 2 can be simplified and the cost can be reduced.

Then, the refrigerant containing the lubricating oil is directly guided to the stator 8 through the discharge passage 90, and not only the oil separation plate 96 but also the stator 8 including the armature winding 9 is passed. Thus, the refrigerant and the lubricating oil can be separated, and only the refrigerant can be discharged out of the compressor 1 satisfactorily.
Further, here, the discharge flow path 90 is constituted by a hole path 92 formed in the scroll unit 30 and the spindle frame 14 and a pipe (for example, a copper pipe) 94 communicating with the path 92. Therefore, the refrigerant and the lubricating oil can be reliably guided to the stator 8 of the motor 6 with a simple structure using the pipe 94, and the structure is further simplified by passing through the hole path 92, thereby reducing the cost. Can be planned.

Further, since the discharge pipe 72 is provided at a position symmetrical to the wiring 100 with the rotating shaft 12 interposed therebetween, the refrigerant separated from the lubricating oil can be smoothly and efficiently removed from the compressor 1 with less interference with the wiring 96 of the motor 6. Can be discharged.
The description of one embodiment of the present invention is finished above, but the present invention is not limited to the above embodiment, and various modifications can be made without departing from the embodiment of the present invention.

  For example, in the above-described embodiment, the discharge flow path 90 is configured by the hole 92 formed in the scroll unit 30 and the spindle frame 14 and the pipe 94 communicating with the path 92. The flow path 90 may be constituted by only the pipe 94. That is, the pipe 94 is disposed inside the scroll unit 30 and the spindle frame 14 or between the scroll unit 30 and the spindle frame 14 and the side wall surface of the trunk portion 3, and the discharge chamber 60, the rotor 7, and the stator 8 are constituted by the pipe 94 alone. These areas may be communicated with each other. Further, if possible, the discharge flow path 90 is constituted only by the hole path 92 passing through the inside of the spindle frame 14, and the discharge chamber 60 and the rotor 7 and stator 8 areas are communicated only by the hole path 92. It may be.

  Further, in the above embodiment, the hermetic compressor is configured as the scroll compressor using the scroll unit 30 as the compressor 1. However, the compressor 1 may perform a series of refrigerant suction, compression, and discharge processes. For example, the present invention is not limited to the scroll compressor, but can be applied to other types of hermetic compressors.

1 is a longitudinal sectional view of a hermetic compressor according to the present invention. It is sectional drawing which follows the AA line of FIG.

Explanation of symbols

1 Hermetic compressor 2 Housing (sealed container)
3 Body 6 Motor 8 Stator 12 Rotating Shaft 14 Spindle Frame 30 Scroll Unit 32 Fixed Scroll 52 Movable Scroll 60 Discharge Chamber 72 Discharge Pipe 90 Discharge Channel 96 Oil Separator Plate 98 Discharge Hole 100 Wiring

Claims (4)

A sealed container having a cylindrical body, a discharge chamber formed above the body, and a lubricating oil storage chamber formed below the body, and a discharge pressure acts in the body When,
A rotating shaft extending through the body and rotatably supported through a bearing;
A rotor that is housed in the body, drives the rotating shaft by energization, and rotates integrally with the rotating shaft around the rotating shaft, and an armature that rotates the rotor around the rotor A stator including windings, and an electric motor formed in the stator and having a supply flow path for guiding lubricating oil to the oil storage chamber;
A compression unit that is housed in the body on the upper side of the electric motor and driven by the rotating shaft to perform a series of processes of suction, compression, and discharge of working fluid;
A spindle frame disposed between the compression unit and the electric motor, fixing the compression unit and supporting the rotating shaft via the bearing;
Provided in at least one of the inside of the compression unit and the spindle frame and between the compression unit and the spindle frame and the inner wall surface of the body portion, and is included in the refrigerant compressed by the compression unit and the refrigerant A discharge flow path for directing lubricating oil from the discharge chamber to the stator;
An oil separating plate that is provided on an upper portion of the stator and separates lubricating oil from a refrigerant guided from the discharge flow path;
A discharge pipe that is provided in the body portion below the spindle frame and discharges the refrigerant that has passed through the oil separation plate and the stator to the outside of the hermetic container;
A hermetic compressor characterized by comprising:   The discharge flow path is a pipe path that is provided in at least one of the inside of the compression unit and the spindle frame and between the compression unit and the spindle frame and the side wall surface of the body portion and extends to the stator. The hermetic compressor according to claim 1.   3. The hermetic compressor according to claim 1, wherein the discharge flow path passes through a path of a hole drilled in the compression unit and the spindle frame. Having wiring for operating the electric motor along the inner wall of the body portion;
The hermetic compressor according to any one of claims 1 to 3, wherein the discharge pipe is provided at a position symmetrical to the wiring with the rotating shaft interposed therebetween.

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