JP2007192200A - Oil separation structure in compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oil separation structure in a compressor, which can improve the oil separation performance by increasing the length of an oil separation chamber. <P>SOLUTION: A muffler forming member 33 is connected to the upper end of a pedestal 32 formed in a cylinder 11 via a plane-like gasket 34 for sealing. The oil separation chamber 36 is successively formed from the pedestal 32 for the muffler forming member 33 in the pedestal 32 and the muffler forming member 33. An oil storage chamber 37 is formed in the pedestal 32 to communicate with a lower oil separation chamber 361 of the pedestal 32 side. A muffler chamber 42 is formed in the muffler forming member 33. The muffler chamber 42 is partitioned from the oil storage chamber 37 by the gasket 34. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an oil separation structure in a compressor.

In the compressor disclosed in Patent Document 1, a muffler forming portion is provided on the outer periphery of a cylinder that is a part of the housing of the compressor, and a first muffler chamber is formed in the muffler forming portion. A muffler cover (muffler forming member) is connected to the muffler forming portion, and a second muffler chamber is formed in the muffler cover. A swirl chamber is defined in the first muffler chamber. A cylindrical oil separator is provided in the swirl chamber so as to hang down. The refrigerant discharged from the cylinder bore to the discharge chamber as the piston reciprocates is guided to the first muffler chamber via the discharge passage. The refrigerant introduced into the first muffler chamber flows into the swirl chamber, and the refrigerant flowing into the swirl chamber moves downward while swirling along the peripheral wall of the swirl chamber. The oil in the refrigerant flowing into the swirl chamber is separated as the refrigerant swirls in the swirl chamber, and the refrigerant swirled in the swirl chamber flows out from the lower end of the cylindrical oil separator to the second muffler chamber through the tube. To do. The oil separated in the swirl chamber is supplied to the crank chamber that houses the swash plate via the recovery passage. Lubricating oil supplied to the crank chamber lubricates lubricated parts in the compressor.
JP-A-11-182430

  In order to increase the oil separation capability in the swirl chamber, it is desirable to increase the length of the swirl chamber (the length from the muffler cover side to the cylinder side). However, in the swirl chamber (oil separation chamber), if the length of the swirl chamber is too large, it is difficult to ensure the necessary strength of the cylinder. Therefore, it is difficult to increase the length of the swirl chamber.

  An object of this invention is to provide the oil separation structure in the compressor which can enlarge the length of an oil separation chamber and can improve oil separation capability.

  According to the present invention, an muffler forming member that forms a muffler chamber for a refrigerant discharged from a cylinder bore that houses a piston is connected to a peripheral surface of a housing of a compressor, and oil that separates oil from the refrigerant discharged from the cylinder bore Targeting an oil separation structure in a compressor having a separation chamber in a discharge pressure region, the invention of claim 1 is provided so that the oil separation chamber is connected from the muffler forming member to the housing, A refrigerant inlet opening to the oil separation chamber is provided in the muffler forming member.

  Since the oil separation chamber is provided across the housing and the muffler forming member, the length of the oil separation chamber (the length from the muffler forming member side to the housing side) is determined when the oil separation chamber is provided only on the housing side. Compared to a long time. Therefore, the oil separation capability in the oil separation chamber is improved.

  In a preferred example, an oil storage chamber communicating with the housing side of the oil separation chamber is provided in the housing, and the oil storage chamber extends from the oil separation chamber in the circumferential direction of the housing.

Since the oil storage chamber is located away from the oil separation chamber in the circumferential direction of the housing, the oil surface height in the oil separation chamber is prevented from adversely affecting the oil separation efficiency of the oil separation chamber.
In a preferred example, a partition for sealing is interposed between the housing and the muffler forming member, and the oil separation chamber passes through the partition and opens to the oil separation chamber. A refrigerant outlet port is provided on the muffler forming member side, the muffler chamber communicates with the refrigerant outlet port, and the muffler chamber and the oil storage chamber are partitioned by the partition body.

  The configuration in which the muffler chamber and the oil storage chamber are partitioned by the sealing partition interposed between the housing and the muffler forming member eliminates the need for a dedicated member for partitioning the muffler chamber and the oil storage chamber.

In a preferred example, the discharge passage of the refrigerant discharged from the cylinder bore penetrates the partition body from the inside of the housing to the refrigerant introduction port.
The partition body prevents the refrigerant in the discharge passage from leaking between the housing and the muffler forming member.

  In a preferred example, the muffler forming member is provided with a refrigerant turning cylinder so as to protrude into the oil separation chamber from the muffler forming member side toward the housing side, and the refrigerant outlet port includes the refrigerant outlet It is a cylinder opening facing the housing side of the turning cylinder.

  The refrigerant introduced into the oil separation chamber flows out from the cylinder port facing the housing of the refrigerant swirling cylinder into the muffler chamber via the inside of the refrigerant swirling cylinder. If the refrigerant introduced into the oil separation chamber is swirled in the oil separation chamber, the oil separation capability is improved. The refrigerant swirling cylinder facilitates the swirling of the refrigerant in the oil separation chamber. However, the longer the refrigerant swirling cylinder, the better the oil separation ability. The oil separation chamber of the present invention, which can be longer than the oil separation chamber provided only on the housing side, is advantageous in making the refrigerant swirl cylinder longer.

  The present invention has an excellent effect that the oil separation capacity can be improved by increasing the length of the oil separation chamber.

Hereinafter, a first embodiment in which the present invention is embodied in a fixed displacement piston compressor will be described with reference to FIGS.
As shown in FIG. 1A, a front housing 12 and a rear housing 13 are connected to the cylinder 11. A suction chamber 131 and a discharge chamber 132 are formed in the rear housing 13. The cylinder 11, the front housing 12, and the rear housing 13 constitute an entire housing of the compressor 10.

  A rotating shaft 14 is rotatably supported by the cylinder 11 and the front housing 12. The rotating shaft 14 is inserted into shaft holes 111 and 121 that are provided through the cylinder 11 and the front housing 12. The rotary shaft 14 is supported by the cylinder 11 and the front housing 12 via radial bearings 18 and 19 provided in the shaft holes 111 and 121.

  A swash plate 16 is fixed to the rotating shaft 14. The swash plate 16 which is a cam body is accommodated in the cam chamber 17. The swash plate 16 is pressed against a thrust bearing 44 between the front housing 12 and the swash plate 16 by the spring force of the compression spring 43. The spring force of the compression spring 43 suppresses rattling of the rotating shaft 14 in the axial direction.

  A lip seal type shaft seal device 15 is interposed between the front housing 12 and the rotary shaft 14. The accommodation chamber 45 that accommodates the shaft seal device 15 communicates with the cam chamber 17. The shaft seal device 15 prevents refrigerant leakage from between the peripheral surface of the rotating shaft 14 and the front housing 12.

  The cam chamber 17 communicates with the external refrigerant circuit 28 via a suction hole 122 provided in the front housing 12. On the external refrigerant circuit 28, a heat exchanger 29 for removing heat from the refrigerant, an expansion valve 30, and a heat exchanger 31 for transferring ambient heat to the refrigerant are interposed.

  A plurality of cylinder bores 20 (five in this embodiment as shown in FIG. 2) are formed in the cylinder 11 so as to be arranged around the rotation shaft 14. A piston 21 is accommodated in the cylinder bore 20.

  The rotational movement of the swash plate 16 that rotates integrally with the rotary shaft 14 is transmitted to the piston 21 through a shoe 22 that is in sliding contact with the swash plate 16 as shown in FIG. 1A, and the piston 21 moves through the cylinder bore 20. Reciprocates back and forth. That is, the piston 21 is interlocked with the rotation of the rotating shaft 14 through the swash plate 16 integrally connected to the rotating shaft 14. The piston 21 defines a compression chamber 201 in the cylinder bore 20.

  A valve plate 23, valve forming plates 24 and 25, and a retainer forming plate 26 are interposed between the cylinder 11 and the rear housing 13. A suction port 231 is formed in the valve plate 23, the valve forming plate 25 and the retainer forming plate 26. A discharge port 232 is formed in the valve plate 23 and the valve forming plate 24. The valve forming plate 24 is formed with a suction valve 241 which is bent and deformed, and the valve forming plate 25 is formed with a discharge valve 251 which is bent and deformed. The suction valve 241 opens and closes the suction port 231, and the discharge valve 251 opens and closes the discharge port 232. A retainer 261 is formed on the retainer forming plate 26. The retainer 261 regulates the opening degree of the discharge valve 251.

An in-shaft passage 142 is formed in the rotating shaft 14. The in-shaft passage 142 communicates with the suction chamber 131 through the passage 46 that penetrates the valve plate 23.
An introduction hole 27 is formed in the rotary shaft 14 so as to communicate with the in-shaft passage 142. The inlet of the introduction hole 27 is between the swash plate 16 and the cylinder 11. The gaseous refrigerant in the cam chamber 17 flows into the in-shaft passage 142 via the introduction hole 27. The refrigerant in the in-shaft passage 142 flows into the suction chamber 131.

  When the cylinder bore 20 is in the suction stroke state (ie, the stroke in which the piston 21 moves from the right side to the left side in FIG. 1A), the refrigerant in the suction chamber 131 pushes the suction valve 241 away from the suction port 231 to the cylinder bore 20. Inhaled into (compression chamber 201). When the cylinder bore 20 is in the discharge stroke state (ie, the stroke in which the piston 21 moves from the left side to the right side in FIG. 1A), the gaseous refrigerant in the cylinder bore 20 (compression chamber 201) is discharged from the discharge port 232. The valve 251 is pushed away and discharged into the discharge chamber 132. The thrust bearing 44 receives the discharge reaction force acting on the swash plate 16 from the cylinder bore 20 via the piston 21 and the shoe 22.

  A pedestal 32 is integrally formed on the outer peripheral surface 110 on the upper side of the cylinder 11 which is a part of the entire housing of the compressor 10. As shown in FIG. 1B, the upper end of the pedestal 32 is flat, and a muffler forming member 33 is connected to the upper end of the pedestal 32 via a flat plate-shaped sealing gasket 34. As shown in FIG. 2, the muffler forming member 33 and the gasket 34 are fastened and fixed to the base 32 by screws 35.

  As shown in FIG. 3, a lower oil separation chamber 361 is formed on the pedestal 32 side (cylinder 11 side), and an upper oil separation chamber 362 is connected to the lower oil separation chamber 361 on the muffler forming member 33 side. Is formed. That is, the pedestal 32 and the muffler forming member 33 are formed so that an oil separation chamber 36 including a lower oil separation chamber 361 and an upper oil separation chamber 362 is continuous from the pedestal 32 to the muffler forming member 33. As shown in FIG. 4, the oil separation chamber 36 has a cylindrical inner shape having a circumferential wall surface 363, and the axial direction of the circumferential wall surface 363 is a direction perpendicular to the gasket 34. .

  The lower oil separation chamber 361 on the pedestal 32 side (cylinder 11 side) is provided above a gap between the uppermost cylinder bore 20 and the adjacent cylinder bore 20 (left adjacent in FIG. 3). An oil storage chamber 37 is formed in the pedestal 32 so as to communicate with the lower oil separation chamber 361 on the pedestal 32 side (cylinder 11 side). The bottom of the oil storage chamber 37 is provided above a narrow space between the uppermost cylinder bore 20 and the adjacent cylinder bore 20 (right adjacent in FIG. 3). That is, the oil storage chamber 37 extends from the oil separation chamber 36 in the circumferential direction of the cylinder 11.

As shown in FIG. 1 (b), the oil storage chamber 37 communicates with the cam chamber 17 via the oil supply passage 112. The inlet of the oil supply passage 112 is provided at the bottom of the oil storage chamber 37.
As shown in FIG. 4, the oil storage chamber 37 is partitioned from the lower oil separation chamber 361 by an arc-shaped partition wall 38 formed integrally with the pedestal 32. The oil storage chamber 37 communicates with the lower oil separation chamber 361 via a communication port 39 on the end side of the arc-shaped partition wall 38. As shown in FIG. 3, the communication port 39 is located higher than the bottom of the lower oil separation chamber 361.

  As shown in FIG. 3, a lower discharge passage 401 is formed in the pedestal 32. The lower discharge passage 401 communicates with the discharge chamber 132. An upper discharge passage 402 is formed in the muffler forming member 33 so as to communicate with the lower discharge passage 401. That is, the discharge passage 40 including the upper discharge passage 402 and the lower discharge passage 401 penetrating the gasket 34 is formed so as to continue from the base 32 to the muffler forming member 33. The outlet 403 of the upper discharge passage 402 opens toward the upper oil separation chamber 362 on the peripheral wall surface of the upper oil separation chamber 362 on the muffler forming member 33 side.

  As shown in FIG. 5, the outlet 403 has a peripheral wall surface 363 of the upper oil separation chamber 362 as seen from the top of the compressor 10 (as viewed in the length direction of the oil separation chamber 36). Oriented. The gaseous refrigerant in the discharge chamber 132 is introduced into the upper oil separation chamber 362 via the discharge passage 40. The refrigerant introduced into the oil separation chamber 36 from the upper discharge passage 402 via the outlet 403 serving as a refrigerant introduction port rotates in the oil separation chamber 36 counterclockwise as viewed from above the compressor 10.

  As shown in FIG. 3, the muffler forming member 33 is integrally formed with a refrigerant turning cylinder 41 so as to protrude into the upper oil separation chamber 362 from the muffler forming member 33 side toward the pedestal 32 side. A cylinder port 411 at the lower end of the refrigerant turning cylinder 41 opens toward the upper oil separation chamber 362 at a position lower than the outlet 403 of the discharge passage 40.

  A muffler chamber 42 is formed in the muffler forming member 33 so as to communicate with the in-cylinder passage 412 of the refrigerant turning cylinder 41. The muffler chamber 42 is partitioned from the oil storage chamber 37 by a gasket 34 as a partition body.

  The refrigerant discharged into the discharge chamber 132 that is the discharge pressure region is the discharge passage 40 that is the discharge pressure region, the outlet 403 as the refrigerant inlet, the oil separation chamber 36 that is the discharge pressure region, the cylinder port 411 as the refrigerant outlet, The refrigerant flows out to the external refrigerant circuit 28 via the in-cylinder passage 412 of the refrigerant turning cylinder 41 and the muffler chamber 42 which is a discharge pressure region. The refrigerant that has flowed out to the external refrigerant circuit 28 returns to the cam chamber 17 that is the suction pressure region.

  Oil is put in a circuit composed of the compressor 10 and the external refrigerant circuit 28, and the oil flows together with the refrigerant. The refrigerant flowing into the oil separation chamber 36 from the outlet 403 of the discharge passage 40 moves toward the bottom of the oil separation chamber 36 while turning in the direction of arrow R along the peripheral wall surface 363 of the oil separation chamber 36 and flows together with the refrigerant. Oil is separated. The oil separated from the refrigerant is transferred to the oil storage chamber 37 through the communication port 39. The oil separated from the refrigerant is stored in the oil storage chamber 37, and the oil stored in the oil storage chamber 37 is supplied to the cam chamber 17 via the oil supply passage 112. The oil supplied to the cam chamber 17 lubricates the portions in the cam chamber 17 that require lubrication (the sliding contact portion between the swash plate 16 and the shoe 22, the shaft seal device 15, the radial bearings 18, 19, the thrust bearing 44, etc.). .

In the first embodiment, the following effects can be obtained.
(1) The longer the length of the oil separation chamber 36 (the length from the muffler forming member 33 side to the cylinder 11 side), the longer the swirling distance when the refrigerant swirls in the oil separation chamber 36, and the oil separation chamber The oil separation capacity at 36 is improved. Since the oil separation chamber 36 is provided across the cylinder 11 and the muffler forming member 33, which are part of the entire housing of the compressor 10, the length of the oil separation chamber 36 is only on the base 32 side (cylinder 11 side). This can be made longer than when an oil separation chamber is provided. Therefore, the oil separation capability in the oil separation chamber 36 is improved.

  (2) If the oil storage chamber is on the lower side of the oil separation chamber 36, a large amount of the separated oil is also stored in the oil separation chamber 36, and the volume in the oil separation chamber 36 is greatly reduced by the oil storage. End up. If it does so, the substantial length (length which goes to the cylinder 11 side from the muffler formation member 33 side) of the oil separation chamber 36 will become short, and the oil separation capability in the oil separation chamber 36 will fall significantly.

Since the oil storage chamber 37 is located away from the oil separation chamber 36 in the circumferential direction of the cylinder 11, the volume of the oil separation chamber 36 is prevented from being greatly reduced by the oil storage.
(3) If the oil storage chamber 37 and the muffler chamber 42 are to be partitioned by a member other than the gasket 34, the number of parts increases and the cost of the compressor increases. The gasket 34 is a member necessary for preventing refrigerant leakage from the joint portion between the cylinder 11 (base 32) and the muffler forming member 33, and the muffler chamber is formed by the gasket 34 used as a member necessary for preventing refrigerant leakage. The structure which divides 42 and the oil storage chamber 37 brings about the reduction of a number of parts.

  (4) The discharge passage 40 passes through the gasket 34 and continues to the oil separation chamber 36. The configuration in which the discharge passage 40 is provided so as to penetrate the gasket 34 is simple in preventing the refrigerant in the discharge passage 40 from leaking from the joint portion between the cylinder 11 (base 32) and the muffler forming member 33. It is a configuration.

  (5) The longer the distance that the refrigerant introduced into the oil separation chamber 36 turns in the oil separation chamber 36, the higher the oil separation capability. The refrigerant turning cylinder 41 facilitates the turning of the refrigerant in the oil separation chamber 36 to increase the turning distance. However, the longer the refrigerant turning cylinder 41, the longer the refrigerant turns in the oil separation chamber 36. Become. The oil separation chamber 36 that can be longer than the oil separation chamber provided only in the cylinder 11 is advantageous in lengthening the refrigerant turning cylinder 41.

In the present invention, the following embodiments are also possible.
As shown in FIG. 6, the lower oil separation chamber 361 and the oil storage chamber 37 on the cylinder 11 side are partitioned in the cylinder 11, and the valve forming plate 24 (see FIG. 1A) of the cylinder 11 and the valve plate 23 [ The bottom of the lower oil separation chamber 361 and the oil storage chamber 37 may be communicated with each other via the communication passage 233 formed in FIG.

As shown in FIG. 6, the cylinder tip of the refrigerant turning cylinder 41 may enter the lower oil separation chamber 361.
O The oil storage chamber 37 in the first embodiment may be eliminated, and the bottom of the lower oil separation chamber 361 may be used as the oil storage chamber.

The oil storage chamber 37 and the muffler chamber 42 may be partitioned by a member other than the gasket 34.
The refrigerant turning cylinder 41 may be formed separately from the muffler forming member 33.
A muffler forming member may be connected to the outer periphery of the front housing 12, and an oil separation chamber extending from the muffler forming member to the front housing 12 may be provided.

A muffler forming member may be provided so as to straddle the cylinder 11 and the front housing 12.
A muffler forming member may be provided so as to straddle the cylinder 11 and the rear housing 13.

O Oil in the oil storage chamber 37 may be directly supplied to the suction chamber 131.
A muffler chamber 42 may be formed between the discharge passage 40 and the oil separation chamber 36 so that the refrigerant flows out from the oil separation chamber 36 to the external refrigerant circuit 28 without passing through the muffler chamber.

The present invention may be applied to a compressor that introduces refrigerant directly from the external refrigerant circuit 28 to the suction chamber 131.
-You may apply this invention to the piston type compressor provided with the cam body of shapes other than a swash plate.

The present invention may be applied to a variable displacement piston compressor as disclosed in Patent Document 1.
The technical idea that can be grasped from the embodiment described above will be described below.

  [1] The bottom of the oil separation chamber on the housing side is above the space between a pair of cylinder bores adjacent in the circumferential direction of the housing on the upper side of the housing, and the bottom of the oil storage chamber is adjacent to the space. The oil separation structure in the compressor according to any one of claims 2 to 5, which is located above another gap.

  The oil level in the oil separation chamber is not increased by the presence of the oil storage chamber.

1 shows a first embodiment, (a) is a side sectional view of the whole compressor. (B) is a partial expanded side sectional view. The AA sectional view taken on the line of Fig.1 (a). BB sectional drawing of FIG.1 (b). CC sectional view taken on the line of FIG. The DD sectional view taken on the line of FIG. Sectional drawing which shows 2nd Embodiment.

Explanation of symbols

  10: Compressor. 11 ... Cylinder as a housing. 110 ... outer peripheral surface. 132: A discharge chamber which is a discharge pressure region. 20: Cylinder bore. 21 ... Piston. 33 ... Muffler forming member. 34 ... Gasket as a compartment. 36. Oil separation chamber. 361: Lower oil separation chamber. 362 ... Upper oil separation chamber. 37 ... Oil storage room. 40: Discharge passage. 401: Lower discharge passage. 402: Upper discharge passage. 403: An outlet as a refrigerant inlet. 41 ... Cylinder for refrigerant swirling. 411: A cylinder port as a refrigerant outlet. 42 ... Muffler room.

Claims (5)

A muffler forming member that forms a muffler chamber for the refrigerant discharged from the cylinder bore that houses the piston is connected to the outer peripheral surface of the compressor housing, and discharges an oil separation chamber that separates oil from the refrigerant discharged from the cylinder bore. In the oil separation structure in the compressor provided in the pressure region,
An oil separation structure in a compressor, wherein the oil separation chamber is provided so as to continue from the muffler forming member to the housing, and a refrigerant inlet opening to the oil separation chamber is provided in the muffler forming member.   2. The compressor according to claim 1, wherein an oil storage chamber communicating with the oil separation chamber on the housing side is provided in the housing, and the oil storage chamber extends from the oil separation chamber in a circumferential direction of the housing. Oil separation structure.   A partition for sealing is interposed between the housing and the muffler forming member, the oil separation chamber passes through the partition, and a refrigerant outlet opening to the oil separation chamber has the The compressor according to claim 2, wherein the compressor is provided on a muffler forming member side, the muffler chamber communicates with the refrigerant outlet, and the muffler chamber and the oil storage chamber are partitioned by the partition body. Oil separation structure.   The oil separation structure in the compressor according to claim 3, wherein a discharge passage of the refrigerant discharged from the cylinder bore penetrates the partition body from the inside of the housing to the refrigerant introduction port.   The muffler forming member is provided with a refrigerant swirling cylinder so as to enter the oil separation chamber from the muffler forming member side toward the housing side, and the refrigerant outlet port is provided on the refrigerant swirling cylinder. The oil separation structure for a compressor according to any one of claims 3 and 4, wherein the oil separation structure is a cylindrical port facing the housing.

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