JP5889110B2 - Horizontal compressor and vehicle air compressor - Google Patents

Description

  The present invention relates to a horizontal compressor and a vehicle air compressor that can be preferably used for air compression.

  Conventionally, in a vehicle air compressor, a plurality of horizontal type compressors that compress air or the like are used. As a horizontal compressor of this type, the crankcase is divided into left and right parts by a partition member, one is a compression mechanism chamber that houses a compression mechanism section, and the other is a motor chamber that houses an electric motor section. There has been proposed a compressor configured to prevent the lubricating oil from flowing into the electric motor chamber (see, for example, Patent Document 1).

Japanese Patent Laying-Open No. 2005-273501 (3rd, 4th pages, FIGS. 2-4, etc.)

  In the compressor of Patent Document 1, the oil seal prevents the lubricating oil from flowing into the electric motor unit, but it cannot be completely prevented, and in fact, a slight oil leak occurs. If the operation is continued with the motor left unattended, the lubricating oil gradually accumulates in the motor section, the input to the motor section increases, or the motor winding part deteriorates due to the lubricating oil mixed with foreign matter such as abrasion powder. Inconveniences such as scratches occur. For this reason, although the structure which discharges | emits the lubricating oil which flowed into the electric motor part from the electric motor part, and returns oil to a compression mechanism part is desired, patent document 1 is not examined at all about this point.

  The present invention has been made in view of the above points, and in a horizontal type compressor configured to prevent inflow of lubricating oil from the compression mechanism chamber to the electric motor chamber, the lubricating oil leaked into the electric motor chamber is transferred to the compression mechanism chamber. It is an object of the present invention to provide a horizontal compressor and an air compressor for a vehicle that can return oil and improve reliability.

  The horizontal compressor according to the present invention connects a compression mechanism unit that compresses air, an electric motor unit that drives the compression mechanism unit, a compression mechanism unit and the electric motor unit, and the rotational force of the electric motor unit is applied to the compression mechanism unit. Transmitting shaft extending in the left-right direction, compression mechanism section, electric motor section and crankcase that accommodates the shaft, and a through-hole through which the shaft is inserted, the crankcase is partitioned into left and right, one of which is stored in the compression mechanism section A compression mechanism chamber, a partition member having the other motor unit in which the motor unit is housed, and a through hole of the partition member and the shaft, and the lubricating oil in the compression mechanism chamber flows into the motor chamber. An oil seal for blocking, and an oil return passage for returning the lubricating oil leaked into the motor chamber through the oil seal to the compression mechanism chamber due to a differential pressure between the compression mechanism chamber and the motor chamber generated during operation. With what That.

  According to the horizontal compressor according to the present invention, the lubricating oil leaked into the electric motor chamber can be returned to the compression mechanism chamber, and the reliability can be improved.

It is a figure which shows the horizontal type compressor 100 which concerns on Embodiment 1 of this invention. It is a figure which shows a unit structure in case the compressor 100 of FIG. 1 is used as a vehicle air compressor. It is a figure which shows the modification 1 of FIG. It is a figure which shows the modification 2 of FIG. It is a figure which shows the modification 3 of FIG. It is a figure which shows 100 A of compressors which concern on Embodiment 2 of this invention. It is a schematic sectional drawing which shows the structure of the filter 70 of FIG. It is a figure which shows the modification 1 of FIG. It is a figure which shows the modification 2 of FIG. It is a figure which shows the compressor 100B which concerns on Embodiment 3 of this invention. It is a figure which shows a unit structure in case the compressor 100B of FIG. 10 is used as a vehicle air compressor. It is a figure which shows the modification 1 of FIG. It is a figure which shows the modification 2 of FIG. It is a figure which shows the structure of the compressor 100C which concerns on Embodiment 4 of this invention. It is a top view of the partition member 20 of FIG. It is operation | movement explanatory drawing of the volt | bolt 91 at the time of an airtight test, and an operation. It is a figure which shows the modification 1 of FIG. It is a figure which shows the modification 2 of FIG. It is a figure which shows the other structural example of the valve which can open and close the oil return flow path 90 of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Embodiment 1 FIG. (Oil return method: External oil return)
FIG. 1 is a diagram showing a horizontal compressor (hereinafter simply referred to as “compressor”) 100 according to Embodiment 1 of the present invention, where (a) is a longitudinal sectional view and (b) is a side view. is there. In FIG. 1, solid arrows indicate the flow of air, and broken arrows indicate the flow of lubricating oil. The same applies to the drawings described later. The configuration and operation of the compressor 100 will be described with reference to FIG. The compressor 100 can be preferably used for air compression. Furthermore, the case where this compressor 100 is a decomposition | disassembly type compressor which can be decomposed | disassembled in the left-right direction is demonstrated to an example. Moreover, in the following drawings including FIG. 1, the relationship of the size of each component may be different from the actual one.

  The compressor 100 connects a compression mechanism unit 1 that compresses air, an electric motor unit 2 that drives the compression mechanism unit 1, a compression mechanism unit 1 and the electric motor unit 2, and uses the rotational force of the electric motor unit 2 as a compression mechanism unit. And a shaft 3 extending in the left-right direction, which is transmitted to 1, and is housed in a crankcase 10 constituting a sealed container. The crankcase 10 is divided into left and right by a partition member 20, and a compression mechanism chamber A for storing the compression mechanism portion 1 and an electric motor chamber B for storing the electric motor portion 2 are formed. The lower part of the compression mechanism chamber A of the crankcase 10 is a reservoir part in which the lubricating oil 17 is accumulated. The shaft 3 is provided so as to pass through the partition member 20 and straddle the compression mechanism chamber A and the motor chamber B.

  The compression mechanism unit 1 has a fixed scroll 1 a and a swing scroll 1 b, and compresses the air sucked from the suction hole 4 in the space between the fixed scroll 1 a and the swing scroll 1 b and discharges it from the discharge hole 5. It is a scroll compression part.

  In the compression mechanism chamber A, a frame 6 is fixed to the crankcase 10 on the motor unit 2 side of the compression mechanism unit 1, and one end of the shaft 3 is supported on the frame 6 via a main bearing 7. ing.

  The shaft 3 is formed with an eccentric shaft portion 3a at one end portion (right end portion in FIG. 1). The eccentric shaft portion 3a extends from the back surface portion of the orbiting scroll 1b in the axial direction toward the electric motor portion 2 side. The boss portion 1 c formed on is connected via the rocking bearing 8. With this configuration, when the shaft 3 rotates, the orbiting scroll 1b moves eccentrically.

  Further, the crankcase 10 is provided with an oil supply pipe 9 that passes through the wall surface on the compression mechanism chamber A side and further passes through the frame 6 to supply the lubricating oil 17 to the main bearing 7. In the shaft 3, a passage 11 is formed so that one end of the main bearing 7 is opened and the other end is opened to the rocking bearing 8. The passage 11 is led from the oil supply pipe 9. Lubricating oil 17 is supplied to the main bearing 7, and lubricating oil 17 that lubricates the main bearing 7 is supplied to the rocking bearing 8 through the passage 11.

  In the compression mechanism chamber A, an oil return chamber 12 formed between the partition member 20 and the frame 6 and communicated with the main bearing 7, and a suction chamber 13 composed of a fixed scroll 1 a and an orbiting scroll 1 b The oil return chamber 12 and the suction chamber 13 communicate with each other through a passage 14 provided in the frame 6.

  The electric motor unit 2 includes a stator 2a that is tightly fixed to the crankcase 10 by shrink fitting or the like, and a rotor 2b that is also closely fixed to the shaft 3 by shrink fitting or the like. The crankcase portion to which the stator 2a is fixed in the crankcase 10 is formed so as to be separable from other crankcase 10 portions, and the divided portion 10a is formed of a metal gasket.

  In addition, although there is generally a rubber gasket as the gasket, the first embodiment uses a metal gasket from the viewpoint of improving assemblability. When the compressor 100 is assembled, a step of placing the electric motor part 2 on the base and moving the electric motor part 2 to correct the radial deviation between the center of the main bearing 7 and the center of the bearing 16 and perform positioning is included. . For this reason, it is calculated | required that it should be set as a structure with a favorable slip with respect to a base, and the metal gasket is used here.

  A seal member 15 is provided at a portion where the divided portion 10a formed of a metal gasket and the other crankcase 10 portion are attached, and is sealed in a liquid-tight manner. As a result, even if the compressor 100 is repeatedly operated and stopped and the metal gasket expands and contracts, the lubricating oil 17 leaked into the motor chamber B from the abutting portion between the divided portion 10a and the other crankcase 10 portion. Is prevented from leaking outside.

  In the motor chamber B, a bearing 16 for supporting the shaft 3 on both sides of the rotor 2 b is provided together with the main bearing 7 on the side opposite to the compression mechanism section 1 of the motor section 2. 3 is rotatably supported at both ends.

  In the motor chamber B, a balancer 18 is provided on the shaft 3 so as to balance the imbalance associated with the eccentric rotational motion by the swing scroll 1b on the compression mechanism section 1 side of the motor section 2.

  The partition member 20 has a configuration in which a disc-shaped partition portion 20a and a cylindrical portion 20b extending in the axial direction from a through hole provided at the center of the partition portion 20a are integrally formed. An oil seal 30 for preventing the lubricating oil 17 from flowing into the motor chamber B is provided between the outer peripheral surface of the shaft 3 passed through the cylindrical portion 20b and the inner peripheral surface of the cylindrical portion 20b. Yes. In the first embodiment, the configuration of the oil seal 30 is not particularly limited, and for example, any configuration such as that disclosed in JP 2011-117359 A can be adopted.

  Providing the oil seal 30 can prevent most of the lubricating oil 17 from flowing into the electric motor chamber B from the compression mechanism chamber A. However, due to the difference in coefficient of thermal expansion due to the difference in material between the partition member 20 and the oil seal 30, the pressure difference between the compression mechanism chamber A and the motor chamber B, etc., the lubricating oil 17 is slightly transferred to the motor chamber B. Leakage occurs.

  For this reason, in the first embodiment, the lubricating oil 17 leaking into the motor chamber B is returned to the compression mechanism section 1 using the differential pressure between the compression mechanism chamber A and the motor chamber B generated during operation. An oil return channel 40 is provided. The oil return passage 40 takes the lubricating oil 17 leaking into the motor chamber B from the opening 40 a provided on the bottom surface of the motor chamber B, guides it outside the crankcase 10, and returns it to the suction side of the compression mechanism section 1. 50. An end portion on the suction side of the compression mechanism portion 1 of the oil return pipe 50 is connected to an oil return hole 4 a provided through the crankcase 10 so as to communicate with the suction hole 4.

  In FIG. 1, a part of the oil return pipe 50 has a through hole 51 a that communicates with an opening 40 a provided on the bottom surface of the electric motor chamber B, and a bulge provided to bulge downward at the bottom of the crankcase 10. The example comprised by the part 52 comprised by the piping 52 comprised by the part 51 and the other part was detachably connected to the through-hole 51a is shown.

  The compressor 100 further covers the cooling fan 53 fixed to the other end portion of the shaft 3 outside the crankcase 10, the cooling fan 53 and a part of the crankcase 10, and the cooling fan 53 and the crankcase 10. And a cover 55 that forms a cooling air passage 54 therebetween.

FIG. 2 is a diagram showing a unit configuration when the compressor 100 of FIG. 1 is used as a vehicle air compressor. In FIG. 2, the solid line arrows indicate the flow of outside air, the broken lines indicate the flow of lubricating oil, and the dashed lines indicate the flow of discharged air (including lubricating oil).
In the vehicle air compressor, a plurality of compressors 100 are connected in parallel, and a unit suction filter 110 is provided in common to each compressor 100. Further, in common with each compressor 100, an oil tank 120 is provided that separates the discharge air including the lubricant 17 discharged from each compressor 100 into the lubricant 17 and the air. Furthermore, an air tank 130 to which air separated by the oil tank 120 is supplied is provided.

  In the air compressor for a vehicle configured as described above, air that has passed through the unit suction filter 110 and from which dust and the like have been removed is supplied to each compressor 100 and compressed by each compressor 100, and then the lubricating oil 17 is discharged from the compressor 100 together. The discharged air containing the lubricating oil 17 discharged from each compressor 100 is supplied to the oil tank 120, where it is separated into the lubricating oil 17 and air, and the lubricating oil 17 is returned to each compressor 100, and the air is It is supplied to the air tank 130.

Next, the operation of the compressor 100 will be described with reference to FIG. First, the flow of air will be described.
The air that has passed through the unit suction filter 110 is taken into the compression mechanism section 1 in the compression mechanism chamber A through the suction hole 4 as indicated by the solid line arrow in FIG. The compression mechanism unit 1 compresses the taken-in air and discharges the high-pressure air to the outside from the discharge hole 5. The discharged air is supplied to the oil tank 120.

  Next, the flow of the lubricating oil 17 will be described. The lubricating oil 17 is pumped only to the compression mechanism chamber A by the oil supply pipe 9 as shown by the broken line arrow in FIG. Lubricating oil 17 pumped from the oil supply pipe 9 is supplied around the main bearing 7 to lubricate the main bearing 7. Then, one of the lubricating oils 17 that have lubricated the main bearing 7 passes through the passage 11 provided in the shaft 3 and lubricates the rocking bearing 8, and then flows into the suction chamber 13.

  Further, the other proceeds from the main bearing 7 to the left in FIG. 1 and lubricates the oil seal 30. Since the cylindrical portion 20 b of the partition member 20 and the shaft 3 are sealed by the oil seal 30, most of the lubricating oil 17 that lubricates the oil seal 30 does not enter the electric motor portion 2 and flows into the oil return chamber 12. The air that has flowed into the oil return chamber 12 flows into the suction chamber 13 through the passage 14, merges with the lubricating oil 17 that has passed through the passage 11, and is sucked into the compression mechanism 1 together with the air. The lubricating oil 17 sucked into the compression mechanism unit 1 is discharged to the outside through the discharge hole 5 together with air, and is supplied to the oil tank 120 outside the compressor 100. Then, after being separated by the oil tank 120, the oil supply pipe 9 returns to the compression mechanism chamber A again.

  Here, when a slight leak occurs in the oil seal 30, the lubricating oil 17 flows into the electric motor chamber B. Since the oil return chamber 12 communicates with the suction chamber 13 of the compression mechanism chamber A through the passage 14, the oil return chamber 12 is always in a negative pressure state during the operation of the compressor 100. On the other hand, since the motor chamber B is at a positive pressure (atmospheric pressure), the lubricating oil 17 leaking into the motor chamber B due to the differential pressure passes through the oil return passage 40 to the suction hole 4 from the oil return hole 4a. Returned.

  As described above, according to the first embodiment, the lubricating oil leaked into the motor chamber B is removed by the oil return passage 40 using the differential pressure between the compression mechanism chamber A and the motor chamber B. Since the oil is returned to A, it is possible to prevent the lubricating oil 17 from accumulating in the electric motor chamber B, and it is possible to prevent inconvenience due to the lubricating oil 17 accumulating in the electric motor chamber B.

  Moreover, since the oil return flow path 40 is comprised by the external piping (oil return pipe) 50, its maintainability is good. Further, the configuration is simple and can be configured at low cost. Further, since the oil return pipe 50 is detachably attached to the bulging portion 51, it may be attached at the time of unit assembly, and the transportability is good.

  In addition, since the abutting portion between the divided portion 10a formed of the metal gasket and the other crankcase 10 portion is sealed by the seal member 15, the lubricating oil leaked into the motor chamber B leaks to the outside and flows into the vehicle interior. It can prevent contamination.

  The compressor 100 of the present invention is not limited to the structure shown in FIG. 1 and can be modified as follows, for example, without departing from the gist of the present invention.

(Modification 1)
In FIG. 1, the lubricating oil leaked into the motor chamber B is directly returned to the suction hole 4 through the oil return pipe 50, but as shown in FIG. 3, a flow rate adjustment valve 56 is provided in the middle of the oil return pipe 50, You may make it return to the suction hole 4 via the flow regulating valve 56. The flow rate adjusting valve 56 may be manually opened and closed, or may be automatically opened and closed by a control device (not shown). With this configuration, the amount of lubricating oil returned from the motor chamber B to the compression mechanism chamber A can be adjusted by the flow rate adjustment valve 56.

  The timing for opening the flow rate adjustment valve 56 and performing oil return can be performed, for example, for 30 seconds when the compressor 100 is started. In addition, the timing specific to the vehicle air compressor can be performed, for example, when driving in the morning.

  By the way, in the air compressor for vehicles, an airtight test is usually performed before installing the air compressor for vehicles in a vehicle and starting operation. This is because if there is an air leak, the lubricating oil 17 leaks from the air leak portion to the outside when the operation is started, and the inside of the vehicle is soiled.

  When performing the airtight test, a device for supplying airtight gas is provided instead of the unit suction filter 110 in FIG. 2, and the closed circuit formed between the compression mechanism chamber A, the oil tank 120 and the air tank 130 is airtight. Gas is injected to check airtightness. However, when the compression mechanism chamber A and the motor chamber B are always in communication with each other through the oil return passage 40 as shown in FIG. 1, the closed circuit cannot be formed, and the airtight test cannot be performed. However, when the flow rate adjustment valve 56 is provided as in Modification 2 shown in FIG. 3, the closed circuit can be formed by closing the flow rate adjustment valve 56, so that an airtight test can be performed.

(Modification 2)
Although FIG. 1 shows a configuration in which the oil return pipe 50 is connected to the oil return hole 4a that opens to the suction hole 4, as shown in FIG. 4, the oil return pipe 50 is connected to the suction pipe 4A connected to the suction hole 4 from the outside. It is good also as composition to do. Note that FIG. 4 is shown for the sake of clarity of the connection relationship, and the connection structure between the oil return pipe 50 and the suction pipe 4A and the routing position of the oil return pipe 50 are not exactly shown.

(Modification 3)
FIG. 1 shows an example in which the oil return pipe 50 is configured by the bulging portion 51 provided at the bottom of the crankcase 10 and the pipe 52. However, as shown in FIG. The opening 40a provided through the bottom surface of the electric motor unit 2 in the vertical direction may be detachably mounted. Also in this case, the oil return pipe 50 may be attached when the unit is assembled, and the transportability is good.

Embodiment 2. FIG. (Outside air intake method: Compressor mounted filter)
If the return of the lubricating oil 17 using the differential pressure between the compression mechanism chamber A and the electric motor chamber B is continued, the pressure in the electric motor chamber B gradually decreases and becomes the same pressure as the compression mechanism chamber A so that the oil can be returned. Disappear. In the second embodiment, the motor room B is communicated with the outside so as to have an atmospheric pressure, and a differential pressure is always secured during operation so that oil can be returned.

6A and 6B show a compressor 100A according to Embodiment 2 of the present invention, in which FIG. 6A is a longitudinal sectional view, and FIG. 6B is a side view. The compressor 100A of the second embodiment is substantially the same except that the first embodiment and the motor chamber B side are partially different except for the configuration, and in the following, the second embodiment is mainly different from the first embodiment. Explained.
In the compressor 100A, the upper wall of the crankcase 10 is formed with an outside air communication hole 60 that allows the motor chamber B to communicate with the outside. By connecting the motor chamber B to the outside through the outside air communication hole 60, the motor chamber B is always at atmospheric pressure. Thereby, during operation, a differential pressure between the compression mechanism chamber A and the electric motor chamber B can always be ensured, and oil return can be continued.

  In addition, a compressor mounting filter (hereinafter simply referred to as “filter”) 70 that captures dust and the like contained in the outside air is attached to the outside air communication hole 60. When the compressor 100 </ b> A is installed in a vehicle as a component of a vehicle air compressor, the compressor 100 </ b> A is usually disposed in a storage room provided under the vehicle. In general, the storage chamber is a contaminated environment containing a lot of dust and the like. For this reason, when taking the air in the storage chamber into the motor chamber B, the filter 70 is provided to remove the dust and the like so that the contaminated air in the storage chamber does not enter the motor chamber B as it is. .

  Incidentally, in the electric motor chamber B, the balancer 18 rotates together with the shaft 3, and the lubricating oil 17 leaking from the oil seal 30 and flowing into the electric motor chamber B is agitated and misted by the balancer 18. For this reason, if the filter 70 is not provided in the outside air communication hole 60 and is left open, the mist of lubricating oil 17 is discharged to the outside through the outside air communication hole 60 and the vehicle is soiled. Therefore, the filter 70 is required to have not only a function of removing dust but also a function of not discharging the mist of lubricating oil 17 to the outside.

FIG. 7 is a schematic cross-sectional view showing the structure of the filter 70 of FIG. In FIG. 7, the solid line arrows indicate the flow of air, and the broken line arrows indicate the flow of misted lubricating oil.
The filter 70 is sandwiched between the first member 71 that is installed by being inserted into the outside air communication hole 60, the second member 74 that is disposed on the upper surface of the first member, and the first member 71 and the second member 74. And a filter member 75 that captures dust and the like, and a cover 76 that covers them.

  The first member 71 is configured to have a substantially T-shaped cross section, and is disposed around the upper end of the outside air communication hole 60 extending outward from the upper end of the shaft portion 71 a and the shaft portion 71 a inserted into the outside air communication hole 60. And a pedestal 71b. The first member 71 penetrates the pedestal portion 71b downward from the upper surface thereof, and further extends downwardly to the middle of the shaft portion 71a, and radially penetrates radially from the lower end of the air passage hole 72. A plurality of air passage holes 73 are formed.

  The second member 74 is configured in a plate shape and has an air passage hole 74 a formed at the center, and is fixed to the first member 71 with the filter member 75 sandwiched between the second member 74 and the first member 71.

  The cover 76 has an upper surface 76a and a side surface 76b extending downward from the periphery of the upper surface 76a and has a shape in which the lower part is opened, and covers and protects the first member 71 and the second member 74 from above. An air passage that guides the outside air introduced into the filter 70 from the gap between the lower surface of the side surface 76b of the cover 76 and the upper surface of the crankcase 10 to the air passage hole 74a is formed.

  In the filter 70 configured as described above, outside air flows into the filter 70 laterally from the gap between the lower surface of the side surface 76b of the cover 76 and the upper surface of the crankcase 10, and after moving upward, Between the inner surface and the second member 74, it flows in the lateral direction toward the air passage hole 74a. The outside air that has flowed into the air passage hole 74a flows downward, passes through the filter member 75, and dust and the like contained in the outside air are removed here. The outside air from which dust and the like are removed flows further downward in the air passage hole 72 of the first member 71 and flows in the radial direction through the air passage hole 73 and flows into the electric motor chamber B.

  As described above, in the filter 70, the outdoor air passage that passes the outside air through the filter member 75 and leads to the outside air communication hole 60 has a labyrinth structure with a meandering air passage. As a result, the lubricating oil 17 misted in the motor chamber B is not discharged to the outside. The labyrinth structure is not limited to the structure shown in FIG.

  As described above, according to the second embodiment, the same effects as those of the first embodiment can be obtained, and a differential pressure between the compression mechanism chamber A and the motor chamber B can be always ensured during operation. The oil return can be continued. Further, by providing the filter 70, it is possible to prevent the mist of the lubricating oil 17 in the electric motor chamber B from being discharged to the outside.

  6 shows the configuration in which the outside air communication hole 60 and the filter 70 are provided in the compressor 100 shown in FIG. 1, but as shown in FIG. 8, the configuration of the modified example 1 shown in FIG. It is good also as a structure which provided the communicating hole and the filter. Moreover, as shown in FIG. 9, it is good also as a structure which provided the external air communication hole 60 and the filter 70 in the structure of the modification 2 shown in FIG. Although not shown, the configuration of the third modification shown in FIG. 5 may be configured such that the outside air communication hole 60 and the filter 70 are provided.

Embodiment 3 FIG. (Outside air intake method: Unit suction filter)
In the second embodiment, the filter 70 is provided in the outside air communication hole 60 of the motor chamber B. However, in the third embodiment, the unit suction filter 110 provided in the vehicle air compressor is replaced with the outside air communication hole of the motor chamber B. It is intended to be used as a filter.

FIG. 10 is a diagram showing a compressor 100B according to Embodiment 3 of the present invention. FIG. 11 is a diagram showing a unit configuration when the compressor 100B is used as a vehicle air compressor. In FIG. 11, solid arrows indicate the flow of outside air, broken lines indicate the flow of lubricating oil, and dashed lines indicate the flow of discharged air (including lubricating oil).
The compressor 100B of the third embodiment is substantially the same except that the second embodiment and the motor chamber B side are partially different except for the configuration, and in the following, the third embodiment is mainly different from the second embodiment. Explained.
In the compressor 100 </ b> B, one end of the suction filter mounting pipe 80 is connected to the discharge port of the unit suction filter 110, and the other end is connected to the outside air communication hole 60. As a result, the outside air from which dust or the like has been removed by the unit suction filter 110 is taken into the motor chamber B from the outside air communication hole 60.

  According to the third embodiment configured as described above, the same effect as in the second embodiment is obtained, and the unit suction filter 110 is also used as a filter for the outside air communication hole. The filter 70 of form 2 can be dispensed with. Therefore, it can be set as a cheap structure compared with Embodiment 2.

  10 shows a configuration in which the compressor 100 shown in FIG. 1 is provided with the outside air communication hole 60 and the suction filter mounting pipe 80, but as shown in FIG. 12, the modification 1 shown in FIG. It is good also as a structure which provided the external air communication hole 60 and the suction filter attachment piping 80 in the structure. Moreover, as shown in FIG. 13, it is good also as a structure which provided the external air communication hole 60 and the suction filter attachment piping 80 in the structure of the modification 2 shown in FIG. Although not shown in the drawings, a configuration in which the outside air communication hole 60 and the suction filter mounting pipe 80 are provided in the configuration of the modified example 3 shown in FIG.

Embodiment 4 FIG. (Oil return method: internal oil return)
In the first to third embodiments, the oil return pipe 50 is provided outside the compressor to return the oil, but in the fourth embodiment, the oil return flow path is provided inside the compressor to return the oil. It has an internal oil return structure that oils.

FIG. 14 is a diagram showing a configuration of a compressor 100C according to Embodiment 4 of the present invention. FIG. 15 is a plan view of the partition member 20 of FIG. In FIG. 15, the dotted arrow indicates the flow of the lubricating oil.
The compressor 100C of the fourth embodiment is substantially the same as that of the first embodiment except that the configuration of the oil return flow path is different, and hereinafter, the fourth embodiment will be described focusing on the parts different from the first embodiment. .
The compressor 100C of the fourth embodiment includes an oil return passage 90 instead of the oil return passage 40 of the first embodiment.

  The oil return flow path 90 has a configuration in which an oil return hole 12 a that connects the electric motor chamber B and the oil return chamber 12 on the compression mechanism chamber A side is provided in the partition member 20. One end of the oil return hole 12 a opens at the bottom of the motor chamber B, and the other end opens at the top of the oil return chamber 12. Since the oil return hole 12 is opened on the outer peripheral end surface of the partition member 20 for manufacturing reasons when the oil return hole 12 is drilled in the partition member 20, the opening portion is closed with a bolt or the like and returned. An oil flow path 90 is configured.

  A bolt 91 as a valve capable of opening and closing the oil return passage 90 is mounted from the outer surface side of the crankcase 10. The bolt 91 closes the oil return flow path 90 as shown in FIG. Then, during operation after the airtight test is completed, the oil return passage 90 is opened by disposing a spacer 92 between the head of the bolt 91 and the crankcase 10 as shown in FIG.

  According to the fourth embodiment configured as described above, the same effect as in the first embodiment can be obtained, and the oil return can be performed in the oil return flow path 90 provided in the compressor 100C. The oil return pipe 50 of form 1 can be dispensed with.

  Further, by storing the oil return passage 90 in the compressor 100C, the compressor that has already been commercialized is also disassembled, and the partition plate 20a provided with the oil return passage 90 is attached, so that the external appearance is obtained. Since there is no change in the parts, there is no need to change the parts around the compressor, and there is compatibility.

  Further, by providing the bolt 91 that can open and close the oil return passage 90 from the outside of the crankcase 10, an airtight test can be performed.

  The internal oil return structure of the fourth embodiment is applied to the compressor of the second embodiment in which outside air is taken into the electric motor chamber B through the compressor mounting filter 70 as shown in FIG. Alternatively, as shown in FIG. 18, the compressor may be applied to the compressor according to the third embodiment in which outside air is taken into the electric motor chamber B through the unit suction filter 110.

  Further, FIG. 14 shows a configuration in which the bolt 91 is used as a valve capable of opening and closing the oil return passage 90, but the configuration of the valve is arbitrary, and for example, the valve 200 shown in FIG. Good. The valve 200 is provided in the opening 90a on the compression mechanism chamber A side of the oil return passage 90. During the airtight test, the airtight gas indicated by the solid line arrow passes through the through-hole 203a of the cover 203 as shown in FIG. The valve body 202 is pressed through. As a result, the valve body 202 moves toward the opening 90a against the biasing force of the spring 201 and closes the opening 90a. When the pressure by the airtight gas is released, the spring 201 returns to the natural length and opens the opening 90a as shown in FIG. As a result, the lubricating oil 17 can be returned to the compression mechanism chamber A through the through hole 203 b provided in the cover 203.

  Moreover, in each said embodiment, although the structure to which a compressor is applied to the air compressor for vehicles was shown, it is not necessarily limited to the air compressor for vehicles.

  In each of the above embodiments, the compression mechanism unit 1 is an example of a scroll type having the fixed scroll 1a and the orbiting scroll 1b. Also good.

  DESCRIPTION OF SYMBOLS 1 Compression mechanism part, 1a Fixed scroll, 1b Rocking scroll, 1c Boss part, 2 Electric motor part, 2a Stator, 2b Rotor, 3 Shaft, 3a Eccentric shaft part, 4 Suction hole, 4A Suction pipe, 4a Oil return hole 5 Discharge hole, 6 frame, 7 main bearing, 8 rocking bearing, 9 oil supply pipe, 10 crankcase, 10a split part (metal gasket), 11 passage, 12 oil return chamber, 12a oil return hole, 13 suction chamber, 14 passage, 15 seal member, 16 bearing, 17 lubricating oil, 18 balancer, 20 partition member, 20a partition portion, 20b cylindrical portion, 30 oil seal, 40 oil return passage, 40a opening, 50 oil return pipe, 51 bulge portion , 51a Through-hole, 52 Piping, 53 Cooling fan, 54 Cooling air passage, 55 Cover, 56 Flow rate adjusting valve, 60 Outside air communication hole, 70 Filter (compressor filter), 71 1st member, 71a Shaft, 71b Base, 72 Air passage hole, 73 Air passage hole, 74 2nd member, 74a Air passage hole, 75 Filter member, 76 Cover, 76a Top surface, 76b Side surface, 80 Suction filter mounting piping, 90 Oil return flow path, 90a Opening, 91 bolt, 92 Spacer, 100 compressor, 100A compressor, 100B compressor, 100C compressor, 110 Unit suction filter, 120 Oil tank , 130 air tank, 200 valve, 201 spring, 202 valve body, 203 cover, 203a through hole, 203b through hole, A compression mechanism chamber, B motor chamber.

Claims (15)

A compression mechanism for compressing air;
An electric motor that drives the compression mechanism;
A shaft extending in the left-right direction, connecting the compression mechanism part and the electric motor part, and transmitting the rotational force of the electric motor part to the compression mechanism part;
A crankcase that houses the compression mechanism, the electric motor, and the shaft;
A partition member having a through-hole through which the shaft is inserted, partitioning the crankcase left and right, one of which is a compression mechanism chamber in which the compression mechanism portion is housed, and the other is an electric motor chamber in which the motor portion is housed. ,
An oil seal provided between the through hole of the partition member and the shaft, and for preventing lubricating oil in the compression mechanism chamber from flowing into the motor chamber;
An oil return passage is provided for returning lubricating oil leaked into the motor chamber through the oil seal to the compression mechanism chamber due to a differential pressure between the compression mechanism chamber and the motor chamber generated during operation. This is a horizontal compressor. The oil return channel is
The lubricating oil leaking into the motor chamber is constituted by an oil return pipe that takes in from an opening provided in a bottom surface of the motor chamber, guides it out of the crankcase, and returns it to the suction side of the compression mechanism section. Item 2. The horizontal compressor according to Item 1. The horizontal compressor according to claim 2, wherein the oil return pipe is provided with a flow rate adjusting valve capable of adjusting an oil return amount. A suction hole that feeds air to the compression mechanism through the crankcase;
The oil return pipe is
The horizontal compressor according to claim 2 or 3, wherein the compressor is connected to an oil return hole provided through the crankcase so as to communicate with the suction hole. A suction hole that feeds air to the compression mechanism through the crankcase;
The horizontal compressor according to claim 2 or 3, wherein a suction pipe is connected to the suction hole, and the oil return pipe is connected to the suction pipe. The horizontal compressor according to any one of claims 2 to 5, wherein the oil return pipe is detachable. The oil return channel is
It is formed with a through hole provided in the partition member,
The through hole is
The horizontal compressor according to claim 1, wherein one end is open to the bottom of the motor chamber and the other end is open to the compression mechanism chamber. The horizontal compressor according to claim 7, wherein a valve capable of opening and closing the oil return channel is provided in the oil return channel. The horizontal direction according to any one of claims 1 to 8, wherein the crankcase has an outside air communication hole for communicating the electric motor chamber with the outside to make the electric motor chamber an atmospheric pressure. Stationary compressor. The horizontal compressor according to claim 9, wherein a filter for capturing dust in the outside air is attached to the outside air communication hole. The filter is
A filter member;
After allowing the outside air to pass through the filter member, it has an outside air duct that leads to the outside air communication hole,
The outside air path is
It has a labyrinth structure by a meandering air path. The horizontal type compressor according to claim 10 characterized by things. A connection pipe connected to an external filter is connected to the outside air communication hole,
The horizontal compressor according to claim 9, wherein the outside air in which dust in the outside air is captured by the external filter is taken into the electric mechanism through the connection pipe and the outside air communication hole. The crankcase is
The crankcase part to which the stator of the electric motor part is fixed is divided and formed so as to be disassembled with other crankcase parts, and the divided part is constituted by a metal gasket,
The horizontal compressor according to any one of claims 1 to 12, wherein an abutting portion between the metal gasket and another crankcase portion is sealed with a seal member. A plurality of horizontal compressors according to any one of claims 1 to 13,
A vehicle air characterized by comprising at least a unit suction filter that is provided in common to the plurality of horizontal compressors and captures dust in the outside air and supplies the dust to the horizontal compressors. Compression device. The external filter is
The vehicular air compressor according to claim 14, which is the unit suction filter.

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