JP5276514B2 - Compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compressor capable of inhibiting the deterioraion in efficiency due to blow-by to the low pressure-side of a refrigerant through an oil return path. <P>SOLUTION: In the compressor 1 includes an oil return path 20 for returning the oil separated by an oil separation mechanism 16 built in a housing 2 to the low pressure-side area LP in the housing 2, the oil return path 20 includes an oil guide path 21 for guiding the oil separated by the oil separation mechanism 16 between a bearing member 9 supporting a compression mechanism 10 and a rotating member 8 supported with the bearing member 9, an oil receiving portion 22 provided to the rotating member 8 to receive each time a predetermined amount of the oil guided through the oil guide path 21, and an oil discharge portion 23 for discharging the oil received by the oil receiving portion 22 to the low pressure-side area LP at every rotation of the rotating member 8. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a compressor in which an oil separation mechanism for separating oil contained in discharged refrigerant gas is built in a housing.

  Conventionally, in a compressor used in a refrigeration cycle, an oil separation mechanism is provided inside the housing, the lubricating oil contained in the compressed refrigerant gas is separated in the compressor, and sent from the compressor to the refrigeration cycle side. Various proposals have been made to suppress a reduction in heat exchange efficiency in a condenser or an evaporator constituting a refrigeration cycle by reducing the amount of oil in the refrigerant gas as much as possible. In these compressors, the oil separated by the oil separation mechanism is returned to the low pressure side region in the compressor to be used for lubrication of the sliding portion, or supplied to the compression chamber to be used for sealing the compression chamber. Yes.

  The oil return path for returning oil from the high-pressure side region to the low-pressure side region of the compressor is generally constituted by a throttle passage. Patent Document 1 shows a configuration in which a throttle passage is configured by inserting a pin into an oil return passage communicating the high pressure side region and the low pressure side region and providing a spiral groove on the outer periphery of the pin or the inner periphery of the passage. . Japanese Patent Application Laid-Open No. H10-228707 discloses that the oil is alternately returned to the thrust bearing surface and the inside of the frame by utilizing the revolving turning of the throttle passage and the orbiting scroll. Further, Patent Document 3 proposes a structure in which a long groove is formed on either the outer peripheral surface of the fixed scroll fitted to the housing or the inner peripheral surface of the housing, and the throttle passage is configured by the groove. In addition, there is also known a solenoid valve provided in the oil return system path so that the oil return system path can be opened and closed.

JP 2002-39067 A JP 2006-220117 A JP 2006-241993 A

  In the above compressor, the amount of lubricating oil returned from the high pressure side region to the low pressure side region via the oil return system is determined by the differential pressure in all cases, so the oil circulation rate that increases or decreases as the number of rotations of the compressor increases or decreases In contrast to (OCR), the oil return amount is insufficient, or the oil return amount becomes too large, causing problems such as the oil returning to the oil return path and the refrigerant blowing through. That is, when the compressor rotates at a high speed, the oil circulation rate (OCR) increases. Therefore, the oil return amount increases, and conversely, when the compressor rotates at a low speed, the oil circulation rate (OCR) decreases. Although it is desirable to reduce the amount of oil return, the conventional compressor cannot realize the desired oil return because the oil return amount is determined by the differential pressure.

  Therefore, in practice, the maximum oil return amount (MAX) is often set in consideration of the differential pressure so as not to cause poor lubrication due to an insufficient oil return amount. For this reason, when the differential pressure increases, the oil may disappear in the oil return system, and high-pressure refrigerant gas will blow through the oil return system to the low pressure side, resulting in a decrease in efficiency. There was a problem.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a compressor capable of suppressing a decrease in efficiency due to blow-through of refrigerant to a low-pressure side through an oil return system. And

In order to solve the above problems, the compressor of the present invention employs the following means.
That is, the compressor according to the present invention has an oil separation mechanism for separating oil contained in the refrigerant gas discharged from the compression mechanism in the housing, and the oil separated by the oil separation mechanism is contained in the housing. In the compressor provided with an oil return path for returning to the low pressure side region, the oil return path is between a bearing member supporting the compression mechanism and a rotating member supported by the bearing member. An oil introduction path that guides the oil separated by the oil separation mechanism, an oil receiving section that is provided in the rotating member and receives a predetermined amount of oil guided through the oil introduction path, and the oil receiving section The compression mechanism is configured to include an oil discharge portion that discharges received oil to the low pressure side region for each rotation of the rotation member, and the rotation member is rotatably supported by a journal bearing portion of the bearing member. It is the crankshaft that drives the The oil receiving portion to the outer peripheral surface of the crankshaft, characterized in that provided in at least one place.

According to the present invention, the oil return path for returning the oil separated by the oil separation mechanism to the low pressure side region in the housing includes the bearing member supporting the compression mechanism and the rotating member supported by the bearing member. An oil introduction path that guides oil separated by the oil separation mechanism, an oil receiving section that is provided in the rotating member and receives a predetermined amount of oil guided through the oil introduction path, and receives the oil at the oil receiving section. An oil discharge portion that discharges the oil to the low pressure side region for each rotation of the rotating member, and the rotating member is a crankshaft that drives a compression mechanism that is rotatably supported by the journal bearing portion of the bearing member. Since the oil receiving portion is provided at least in one place on the outer peripheral surface of the crankshaft, the amount of oil return when returning the oil separated by the oil separation mechanism to the low pressure side region in the housing It can be increased or decreased so as to be approximately proportional to. In other words, the oil return amount is such that the oil received by the oil receiving portion provided on the outer peripheral surface of the crankshaft is discharged to the low pressure side region through the oil discharge portion every time the crankshaft rotates once, and the oil separation mechanism Since the separated oil is sequentially returned to the low pressure side region in the housing, it is determined by the product of the volume of the oil receiving portion and the rotational speed of the crankshaft as the rotating member. It is possible to increase or decrease the return amount. Therefore, by setting the volume of the oil receiving part appropriately, it is an ideal oil that increases or decreases the oil return amount corresponding to the increase or decrease of the oil circulation amount that is substantially proportional to the rotation speed without being influenced by the pressure condition. The return can be realized, and the efficiency reduction due to the blow-through of the refrigerant through the oil return system can be suppressed.

  Furthermore, the compressor of the present invention is characterized in that, in the above-mentioned compressor, the oil receiving portion is constituted by a concave portion provided on an outer peripheral surface of the crankshaft.

  According to the present invention, since the oil receiving portion is constituted by the concave portion provided on the outer peripheral surface of the crankshaft, the oil receiving portion can be easily provided by providing the concave portion having an appropriate volume on the outer peripheral surface of the crankshaft. A set amount of oil can be returned from the oil separation mechanism side to the low pressure side region in the housing for each rotation of the crankshaft through the oil receiving portion. Accordingly, an appropriate amount of oil corresponding to the increase or decrease of the oil circulation amount can be returned to the low pressure side region while preventing the refrigerant from being blown through the oil return system.

  Furthermore, the compressor according to the present invention is characterized in that, in any of the above-described compressors, the journal bearing portion is provided with seal members at positions corresponding to both axial sides of the oil receiving portion. To do.

  According to the present invention, since the seal member is provided at a position corresponding to both axial sides of the oil receiving portion of the journal bearing portion, oil leakage from the bearing gap is prevented by the seal member, and the oil receiving portion is always provided. A set amount of oil can be returned from the oil separation mechanism side to the low pressure side region in the housing via the. Therefore, the oil return as set can be realized, and the efficiency reduction due to the blow-through of the refrigerant through the oil return system path can be suppressed.

Furthermore, the compressor according to the present invention has an oil separation mechanism for separating oil contained in the refrigerant gas discharged from the compression mechanism in the housing, and the oil separated by the oil separation mechanism is contained in the housing. In the compressor provided with the oil return path for returning to the low pressure side region, the compression mechanism is a scroll compression mechanism, and the oil return path is a bearing member that supports the compression mechanism and the bearing. An oil introduction path that guides the oil separated by the oil separation mechanism between the rotation member supported by the member, and a predetermined amount of oil that is provided in the rotation member and guided through the oil introduction path. An oil receiving portion that receives the oil, and an oil discharge portion that discharges oil received by the oil receiving portion to the low-pressure side region for each rotation of the rotating member, the rotating member being a thrust bearing portion of the bearing member Is pivotally supported by Is an orbiting scroll of the serial scroll compression mechanism, the oil receiving portion to the end plate back surface of the orbiting scroll, characterized in that provided in at least one place.

According to the present invention, the compression mechanism is a scroll compression mechanism, and the oil return path is provided between the bearing member supporting the compression mechanism and the rotating member supported by the bearing member. An oil introduction path that guides the oil separated in step, an oil receiving section that is provided in the rotating member and receives the oil guided through the oil introduction path by a predetermined amount, and the oil received by the oil receiving section An oil discharge portion that discharges to the low-pressure side region for each rotation, and the rotating member is a turning scroll of a scroll compression mechanism that is rotatably supported by a thrust bearing portion of the bearing member. Since the oil receiving part is provided in at least one place on the back surface of the plate, the oil received by the oil receiving part provided on the back surface of the end plate of the orbiting scroll receives the oil received at the low pressure side region in the oil discharging part every revolution revolution. Drained into oil Oil separated in the mechanism can be sequentially returned to the low pressure side region of the housing. Accordingly, it is possible to realize an ideal oil return that increases or decreases the oil return amount in accordance with an increase or decrease in the oil circulation amount that is substantially proportional to the number of revolutions (the number of revolutions) of the orbiting scroll, and through the oil return system. It is possible to suppress a decrease in efficiency due to the blow-through of the refrigerant.

  Furthermore, the compressor of the present invention is characterized in that, in the above-mentioned compressor, the oil receiving portion is constituted by a concave portion provided on a rear surface of the end plate of the orbiting scroll.

  According to the present invention, since the oil receiving portion is constituted by the concave portion provided on the back surface of the end plate of the orbiting scroll, the oil receiving portion can be easily received by providing the concave portion having an appropriate volume on the back surface of the end plate of the orbiting scroll. A set amount of oil can be returned from the oil separation mechanism side to the low pressure side region in the housing each time the orbiting scroll revolves through the oil receiving portion. Accordingly, an appropriate amount of oil corresponding to the increase or decrease of the oil circulation amount can be returned to the low pressure side region while preventing the refrigerant from being blown through the oil return system.

  Furthermore, the compressor of the present invention is the compressor according to any one of the above-described compressors, wherein the oil receiving portion is moved radially outward from the thrust bearing portion every revolution revolution on the rear surface of the end plate of the orbiting scroll. It is provided, and it is constituted so that oil may be discharged to the refrigerant suction passage of the scroll compression mechanism by movement for each revolution turning to this position.

  According to the present invention, the oil receiving portion is provided at a position where the oil receiving portion moves radially outward from the thrust bearing portion every revolution revolution on the rear surface of the end plate of the orbiting scroll, and the oil is supplied by the movement every revolution revolution to the position. Since it is configured to discharge to the refrigerant suction passage of the scroll compression mechanism, the oil separated by the oil separation mechanism is returned to the refrigerant suction passage of the scroll compression mechanism by a set amount every revolution revolution of the orbiting scroll, and always constant An amount of oil can be circulated between the oil separation mechanism and the scroll compression mechanism. Thereby, the gas sealing effect by the oil in the scroll compression mechanism can be enhanced, and the compression efficiency can be improved.

  Furthermore, in the compressor according to any one of the above-described compressors, any one of the thrust bearing portion and the end plate rear surface of the orbiting scroll has an annular shape that communicates with the oil introduction path and the oil receiving portion. An oil sump is provided.

  According to the present invention, an annular oil sump that communicates with the oil introduction path and the oil receiving part is provided on one of the thrust bearing part or the back of the end plate of the orbiting scroll, so that the high pressure separated by the oil separation mechanism is provided. By guiding the oil to the annular oil sump through the oil introduction path and constantly holding a certain amount of high-pressure oil in the sump, the thrust bearing can be lubricated and back pressure is applied to the back of the end plate of the orbiting scroll. The load can be canceled and a part of the thrust force can be canceled. Therefore, the lubrication performance can be improved, and at the same time, the sliding loss in the thrust bearing portion can be reduced and the compressor efficiency can be improved.

  According to the present invention, the oil return amount when the oil separated by the oil separation mechanism is returned to the low pressure side region in the housing can be increased or decreased so as to be substantially proportional to the rotational speed of the compressor. By setting the volume appropriately, it is possible to realize an ideal oil return that increases or decreases the oil return amount in response to an increase or decrease in the oil circulation amount that is approximately proportional to the rotation speed, regardless of the pressure condition. It is possible to suppress a decrease in efficiency due to the blow-through of the refrigerant through the oil return path.

It is a longitudinal section of the compressor concerning a 1st embodiment of the present invention. It is a longitudinal cross-sectional view of the compressor which concerns on 2nd Embodiment of this invention. 3A is a plan view of a thrust bearing portion of the compressor shown in FIG. 2 and FIG. FIG. 4 is a plan view (A) of the thrust bearing portion of the compressor shown in FIG. 2 at a turning position different from that in FIG.

Embodiments according to the present invention will be described below with reference to the drawings.
[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to FIG.
FIG. 1 is a longitudinal sectional view of a compressor according to the first embodiment of the present invention. In the present embodiment, a case where the present invention is applied to a scroll compressor (compressor) 1 will be described.
A scroll compressor (compressor) 1 includes a cylindrical intermediate housing 3, an upper housing 4 that seals its upper end side, and a lower housing (not shown) that seals the lower end side of the intermediate housing 3. ) 2.

An electric motor 5 including a stator 6 and a rotor 7 is fixedly installed at a lower portion of the intermediate housing 3, and a crankshaft 8 is integrally coupled to the rotor 7 of the electric motor 5.
Further, the bearing member 9 is fixedly installed on the upper portion of the intermediate housing 3 by plug welding or caulking at a plurality of locations on the outer periphery. An upper portion of the crankshaft (rotating member) 8 is rotatably supported on the journal bearing portion 9A of the bearing member 9, and a fixed scroll 11 and an orbiting scroll 12 are provided on the upper portion of the bearing member 9. A scroll compression mechanism (compression mechanism) 10 is incorporated.

  The fixed scroll 11 constituting the scroll compression mechanism 10 is fixedly supported by a bearing member 9 via bolts or the like, while the orbiting scroll 12 is engaged with the fixed scroll 11 in the thrust bearing portion of the bearing member 9. It is supported by 9B so that turning is possible. The orbiting scroll 12 is fitted with a boss portion 12B provided on the back surface of the end plate 12A by fitting a crank pin 8A provided eccentric to the shaft end of the crankshaft 8 via a drive bush 13 or the like. It is designed to be swiveled. Further, between the back surface of the end plate 12A of the orbiting scroll 12 and the bearing member 9, an anti-rotation mechanism 14 such as an Oldham ring for inhibiting the rotation of the orbiting scroll 12 is interposed, whereby the orbiting scroll 12 is fixed. It is configured to be driven to revolve around the scroll 11.

  A discharge port 11B is provided at a central portion of the end plate 11A of the fixed scroll 11, and the discharge port 11B is provided on a discharge cover 15 that partitions the inside of the sealed housing 2 into a low pressure side region LP and a high pressure side region HP. It is connected to the discharge hole 15A. An oil separation mechanism 16 is provided on the discharge cover 15, and high-pressure refrigerant gas containing lubricating oil compressed by the scroll compression mechanism 10 is discharged through the discharge hole 15 </ b> A. .

  The oil separation mechanism 16 includes two discharge pipes 16 </ b> A that discharge high-pressure refrigerant gas containing lubricating oil along the inner circumferential direction of the discharge chamber 17 formed in the upper housing 4. The lubricating oil contained in the gas is centrifuged. The oil separated in the discharge chamber 17 is stored in an oil sump 18 formed at the lowermost portion, while the high-pressure refrigerant gas from which the oil has been separated is sent to the refrigeration cycle side via the discharge pipe 19. It has come to be.

  An oil return path 20 that returns high-pressure oil stored in the oil reservoir 18 to the low-pressure region LP is disposed between the oil reservoir 18 that is the high-pressure region HP and the low-pressure region LP in the sealed housing 2. Is provided. The oil return path 20 is an oil introduction path 21 that guides the oil in the oil reservoir 18 to the journal bearing surface between the journal bearing portion 9A of the bearing member 9 and the crankshaft 8 that is rotatably supported by the journal bearing portion 9A. And an oil receiving portion 22 configured to receive a predetermined amount of oil guided through the oil introduction passage 21 and the oil introduction passage 21 of the journal bearing portion 9A. And an oil discharge portion 23 formed of a radial hole for discharging the oil received by the oil receiving portion 22 to the low pressure side region LP every rotation of the crankshaft 8.

  The oil introduction path 21 can be configured by inserting a pipe bent in an L shape between the oil reservoir 18 and the journal bearing portion 9A. Further, the oil receiving portion 22 can be configured by providing a recess having a predetermined volume at at least one location on the outer peripheral surface of the crankshaft 8. The volume of the oil receiving portion 22 determines the amount of oil return per rotation of the crankshaft 8. The oil receiving part 22 may be divided into a plurality of recesses. Further, the oil discharge portion 23 is provided radially on the journal bearing portion 9A so that the oil discharged in the radial direction from the oil receiving portion 22 by the centrifugal force due to the rotation of the crankshaft 8 can be discharged as it is to the low pressure side region LP. Can be configured with a hole.

  Further, as shown in FIG. 1, seal members 24 such as O-rings are provided at positions corresponding to both axial sides of the oil receiving portion 22 of the journal bearing portion 9 </ b> A, and the journal bearing surface passes through the oil introduction path 21. It may be configured such that the set amount of oil is always returned via the oil receiving portion 22 by preventing the oil guided to 1 from being discharged from the bearing gap.

With the configuration described above, according to the present embodiment, the following operational effects can be obtained.
The scroll compression mechanism 10 compresses the refrigerant gas by rotating the electric motor 5 and driving the orbiting scroll 12 to revolve around the fixed scroll 11 via the crankshaft 8, and compresses the refrigerant gas into the discharge port 11B and the discharge hole. The oil is discharged into the oil separation mechanism 16 through 15A. The high-pressure refrigerant gas contains lubricating oil, and the oil is centrifuged in the process of being discharged into the discharge chamber 17 through the discharge pipe 16A of the oil separation mechanism 16, and the high-pressure refrigerant from which the oil has been separated. The gas is sent to the refrigeration cycle side through the discharge pipe 19.

  The oil separated in the discharge chamber 17 is stored in the oil reservoir 18, and from there, the low pressure in the hermetic housing 2 is sequentially set by a set amount so as to be approximately proportional to the rotational speed of the compressor 1. Returned to the side area LP. In other words, the high-pressure oil stored in the oil reservoir 18 is guided between the journal bearing portion 9A and the crankshaft 8 via the oil introduction path 21, that is, to the journal bearing surface, and provided on the outer peripheral surface of the crankshaft 8. The oil receiving unit 22 is handed over. The oil received by the oil receiving portion 22 is held on the crankshaft 8 side, and is discharged to the low pressure side region LP in the hermetic housing 2 through the oil discharge portion 23 every time the crankshaft 8 makes one rotation.

The amount of oil returned from the oil reservoir 18 to the low pressure side region LP in the hermetic housing 2 via the oil return path 20 is determined by the volume of the oil receiving portion 22 provided in the crankshaft 8 and the crankshaft 8. The oil return amount can be increased / decreased in proportion to the increase / decrease of the rotation speed of the compressor 1 and is determined by the product of the rotation speed.
For this reason, by appropriately setting the volume of the oil receiving portion 22, the oil return amount is increased or decreased in accordance with the increase or decrease of the oil circulation amount that is substantially proportional to the rotation speed of the compressor, regardless of the pressure condition. The ideal oil return can be achieved. This also eliminates oil in the oil return line 20 due to the differential pressure, prevents the high pressure refrigerant gas from blowing through the oil return line 20 to the low pressure region, and reduces the efficiency due to the high pressure refrigerant gas blowing through. Can be suppressed.

  In addition, the oil receiving portion 22 can be easily configured by providing a recess having an appropriate volume on the outer peripheral surface of the crankshaft 8, and the crankshaft 8 is sequentially set for each rotation through the oil receiving portion 22. It is possible to return a sufficient amount of oil from the oil separation mechanism 16 side to the low pressure side region LP in the housing 2. For this reason, an appropriate amount of oil corresponding to an increase or decrease in the amount of oil circulation that is substantially proportional to the rotation speed of the crankshaft 8 while preventing the refrigerant from blowing through the oil return system path 20 from the oil separation mechanism 16 side to the low pressure side. It can be returned to the region LP.

  Furthermore, in this embodiment, since seal members 24 such as O-rings are provided at positions corresponding to both axial sides of the oil receiving portion 22 in the journal bearing portion 9A, the oil from the bearing clearance on the journal bearing surface is provided. Leakage can be prevented by the seal member 24. For this reason, a set amount of oil can always be returned from the oil separation mechanism 16 side to the low pressure side region LP in the housing 2 via the oil receiving portion 22, so that the oil return as set is realized, and the oil return system It is possible to suppress a decrease in efficiency due to the blow-through of the refrigerant through the path 20.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIGS.
This embodiment differs from the first embodiment described above in the position where the oil receiving portion 32 is provided. Since other points are the same as those in the first embodiment, description thereof will be omitted.
In the present embodiment, as shown in FIG. 2, a pipe bent in a U shape that constitutes the oil introduction path 31 of the oil return system path 20 is formed by connecting the oil reservoir 18 and the thrust bearing portion 9 </ b> B of the bearing member 9. The oil from the oil reservoir 18 is guided between the thrust bearing portion 9B and the back surface of the end plate 12A of the orbiting scroll 12, that is, to the thrust bearing surface.

  An oil receiving portion 32 that receives the oil guided to the thrust bearing surface by the oil introduction path 31 is provided on the back surface of the end plate 12A of the orbiting scroll (rotating member) 12 that performs a revolving orbiting motion, as shown in FIG. The end plate 12A is configured to receive oil when it coincides with the opening of the oil introduction path 31 on a turning circle at a specific position of the end plate 12A. The oil receiving portion 32 is configured by a concave portion having a predetermined volume, and each time the orbiting scroll 12 is driven to revolve orbit, the back surface of the end plate 12A is radially outward from the thrust bearing surface of the thrust bearing portion 9B. It is provided at the position to move. Further, this movement position is set as an oil discharge portion 33, and the oil held by the oil receiving portion 32 is discharged to the refrigerant suction passage 34 of the scroll compression mechanism 10 by the movement of each revolution turning to the position. Has been.

  Further, in addition to the above, either the back surface of the end plate 12A of the orbiting scroll 12 or the thrust bearing surface of the thrust bearing portion 9B is communicated with the oil introduction path 31 and the oil receiving portion 32 and led from the oil reservoir 18. It is good also as a structure which provided the oil sump 35 comprised by the annular groove etc. which hold | maintain a fixed amount of high pressure oil. The oil sump 35 may use an existing oil sump groove provided on the thrust bearing surface of the thrust bearing portion 9B.

  Thus, according to the present embodiment, the rotating member is the orbiting scroll 12 of the scroll compression mechanism 10, and the oil receiving portion 32 is provided in at least one place on the back surface of the end plate 12A. Therefore, the oil guided to the thrust bearing surface from the oil reservoir 18 through the oil introduction passage 31 is received by the oil receiving portion 32, and the oil is discharged from the low pressure side region LP by the oil discharge portion 33 each time the orbiting scroll 12 revolves. The oil discharged to the refrigerant suction passage 34 of the scroll compression mechanism 10 and separated by the oil separation mechanism 16 can be sequentially returned to the low pressure side region LP in the housing 2.

Therefore, as in the first embodiment described above, an ideal oil return that increases or decreases the oil return amount corresponding to an increase or decrease in the oil circulation amount that is substantially proportional to the number of revolutions of the orbiting scroll (= the number of revolutions of the crankshaft 8). While being realizable, the efficiency fall by the blow-through of the refrigerant | coolant through the oil return system path 20 can be suppressed.
Further, the oil guided from the oil reservoir 18 of the oil separation mechanism 16 is returned to the refrigerant suction passage 34 of the scroll compression mechanism 10 that is the low-pressure side region LP by a set amount every revolution revolution, and a constant amount of oil is always kept in the oil separation mechanism. Since it is made to circulate between 16 and the scroll compression mechanism 10, the gas seal effect by the oil in the scroll compression mechanism 10 can be improved, and compression efficiency can be improved.

  Furthermore, the oil receiving portion 32 can be easily configured by providing a recess having an appropriate volume on the back surface of the end plate 12A of the orbiting scroll 12, and each turn of the orbiting scroll 12 is made through the oil receiving portion 32. It becomes possible to return the set amount of oil from the oil separation mechanism 16 side to the low pressure side region LP in the housing 2 in sequence. Accordingly, an appropriate amount of oil corresponding to an increase or decrease in the amount of circulating oil that is substantially proportional to the number of revolutions of the orbiting scroll 12 while preventing the refrigerant from blowing through the oil return system passage 20 is supplied from the oil separation mechanism 16 side to the low pressure side region. You can return to LP.

  In addition, in this embodiment, an annular oil reservoir 35 communicating with the oil introduction path 31 and the oil receiving portion 32 is provided on either the thrust bearing surface of the thrust bearing portion 9B or the back surface of the end plate 12A of the orbiting scroll 12. Therefore, the high-pressure lubricating oil separated by the oil separation mechanism 16 can be guided to the annular oil sump 35 by the oil introduction path 31, and a constant amount of high-pressure oil can be always held in the oil sump 35. Therefore, the thrust bearing portion 9B can be lubricated, and a back pressure can be applied to the back surface of the end plate 12A of the orbiting scroll 12 to cancel a part of the thrust force, thereby improving the lubrication performance. At the same time, sliding loss at the thrust bearing portion 9B can be reduced, and the efficiency of the compressor can be improved.

  In addition, this invention is not limited to the invention concerning the said embodiment, In the range which does not deviate from the summary, it can change suitably. For example, the compressor 1 is not limited to the scroll compressor 1 described above, and can be similarly applied to a compressor having another compression mechanism. Further, the oil separation mechanism 16 has been described with respect to a system in which high-pressure refrigerant gas containing lubricating oil is discharged and discharged along the inner periphery of the discharge chamber 17 via the pipe 16A, and the oil is centrifuged. Not limited to this, an oil separation mechanism of any configuration may be used.

1 Scroll compressor (compressor)
2 Sealed housing (housing)
8 Crankshaft (Rotating member)
9 Bearing member 9A Journal bearing portion 9B Thrust bearing portion 10 Scroll compression mechanism (compression mechanism)
12 Orbiting scroll (rotating member)
12A End plate 16 Oil separation mechanism 20 Oil return path 21, 31 Oil introduction path 22, 32 Oil receiving section 23, 33 Oil discharge section 24 Seal member 34 Refrigerant suction path 35 Oil reservoir LP Low pressure side region

Claims (7)

An oil separation mechanism that separates oil contained in the refrigerant gas discharged from the compression mechanism in the housing, and returns the oil separated by the oil separation mechanism to the low pressure side region in the housing In the compressor provided with
The oil return system path includes an oil introduction path that guides the oil separated by the oil separation mechanism between a bearing member supporting the compression mechanism and a rotating member supported by the bearing member; and the rotation An oil receiving portion provided on the member and receiving a predetermined amount of oil guided through the oil introduction path, and the oil received by the oil receiving portion is discharged to the low pressure side region for each rotation of the rotating member. An oil discharge part ,
The rotating member is a crankshaft that drives the compression mechanism that is rotatably supported by the journal bearing portion of the bearing member, and the oil receiving portion is provided in at least one place on the outer peripheral surface of the crankshaft. The compressor characterized by having. The compressor according to claim 1 , wherein the oil receiving portion is configured by a concave portion provided on an outer peripheral surface of the crankshaft. Wherein the journal bearing part, compressor according to claim 1 or 2, characterized in that the sealing member is provided at a position corresponding to the axially opposite side portions of the oil receiving portion. An oil separation mechanism that separates oil contained in the refrigerant gas discharged from the compression mechanism in the housing, and returns the oil separated by the oil separation mechanism to the low pressure side region in the housing In the compressor provided with
The compression mechanism is a scroll compression mechanism,
The oil return system path includes an oil introduction path that guides the oil separated by the oil separation mechanism between a bearing member supporting the compression mechanism and a rotating member supported by the bearing member; and the rotation An oil receiving portion provided on the member and receiving a predetermined amount of oil guided through the oil introduction path, and the oil received by the oil receiving portion is discharged to the low pressure side region for each rotation of the rotating member. An oil discharge part,
The rotating member is a orbiting scroll of the scroll compression mechanism that is rotatably supported by a thrust bearing portion of the bearing member, and the oil receiving portion is provided in at least one place on the rear surface of the end plate of the orbiting scroll. The compressor characterized by having. The compressor according to claim 4 , wherein the oil receiving portion is configured by a concave portion provided on a back surface of the end plate of the orbiting scroll. The oil receiving portion is provided at a position that moves radially outward from the thrust bearing portion every revolution revolution on the rear surface of the end plate of the orbiting scroll, and the scroll compression is performed by the movement at each revolution revolution to the position. 6. The compressor according to claim 4 , wherein the compressor is configured to discharge to a refrigerant suction path of the mechanism. The thrust bearing portion or on one of the end plates back surface of the orbiting scroll, to 4 claims, wherein the oil introduction passage and sump annular communicating with the oil receiving portion is provided 6 The compressor in any one of.

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