KR101069035B1 - Compressor - Google Patents

Abstract

The present invention, the drive shaft 450 to the swash plate 460 that rotates in the swash plate chamber 436 formed in the front and rear cylinder blocks 430, 440 to which the front and rear housings 410 and 420 are coupled, respectively. And pistons 470 respectively housed in a plurality of cylinder bores 431 and 441 arranged annularly around the drive shaft 450 and reciprocating in conjunction with rotation of the swash plate 460, The refrigerant sucked into the main refrigerant suction passage 451 formed inside the drive shaft 450 from 436 sequentially rotates the main refrigerant suction passage 451 and the cylinder bores 431 and 441 by the rotation of the drive shaft 450. In the compressor that is sucked into each of the cylinder bores (431, 441) through a plurality of suction passages (432, 442) formed in the front and rear cylinder blocks (430, 440) so as to communicate with each other, An oil return hole 490 is formed at the side surface to communicate the swash plate chamber 436 and the main refrigerant suction passage 451, and is formed in the main refrigerant suction passage 451 of the drive shaft 450. And an oil separation member 600 provided with at least one oil separation pin 610 and 620 having a spiral shape to separate oil flowing through the main refrigerant suction flow path 451 from the refrigerant. do.

Description

Compressor {COMPRESSOR}

Figure 1 (a) is a side cross-sectional view of a conventional compressor, Figure 1 (b) is a cross-sectional view A-A of (a).

2 is a cross-sectional view taken along line B-B in FIG.

3 is a cross-sectional view of a compressor according to an embodiment of the present invention.

4 is a cutaway perspective view of a drive shaft according to an exemplary embodiment of the present invention.

5 is a cross-sectional view of a drive shaft according to an embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

400: compressor 410: front housing

411,421: discharge chamber 420: rear housing

424: refrigerant storage chamber 430: front cylinder block

431,441: Cylinder bore 432,442: Suction passage

433,443: Shaft support 434,444: discharge passage

435, 445: muffler 436: judge

437: Refrigerant communication path 438,448: Needle roller bearing

440: rear cylinder block 447: discharge port

449: auxiliary refrigerant suction flow path 450: drive shaft

451: main refrigerant suction flow path 452: inlet

453: exit 460: swash plate

465: shoe 470: piston

480: valve unit 481: valve plate

481a: refrigerant discharge hole 481b: communication path

482: discharge lead 490: oil return hole

500: oil separation member support 600: oil separation member

610: front oil separation pin 620: rear oil separation pin

The present invention relates to a compressor. More particularly, the present invention relates to a compressor that separates only oil from a refrigerant supplied to a cylinder bore and oil and supplies the oil back to the swash plate chamber to improve lubricity in the swash plate chamber.

In general, a compressor for automobiles sucks refrigerant gas discharged after evaporation is completed from an evaporator, converts the refrigerant gas into a refrigerant gas in a high temperature and high pressure state that is easily liquefied, and discharges the refrigerant gas.

Such compressors include various types of swash plate compressors, in which a piston reciprocates by the rotation of an inclined swash plate, scroll compressors compressed by two scrolls, and vane rotary compressors compressed by a rotary vane (v ane). have.

Among these, the reciprocating compressor that compresses the refrigerant according to the reciprocating motion of the piston includes crank type and wobble plate type, in addition to the swash plate compressor. And swash plate compressors.

1 and 2 are views showing a conventional fixed displacement swash plate compressor, which will be briefly described with reference to the following.

As shown in FIG. 1 (a), the front housing 13 and the rear housing 14 are joined to the pair of cylinder blocks 11 and 12 joined together, and the discharge chamber 131 is connected to the front housing 13. ) Is formed. In the rear housing 14, a discharge chamber 141 and a suction chamber 142 are formed.

A valve plate 15, a lead forming plate 16 and a retainer forming plate 17 are interposed between the cylinder block 11 and the front housing 13.

The valve plate 18, the lead forming plate 19, and the retainer forming plate 20 are interposed between the cylinder block 12 and the rear housing 14. Discharge holes 151 and 181 are formed in the valve plates 15 and 18, and discharge leads 161 and 191 are formed in the lead forming plates 16 and 19. The discharge leads 161 and 191 open and close the discharge holes 151 and 181.

The shaft 21 is rotatably supported by the cylinder blocks 11 and 12. The rotary shaft 21 is inserted into the shaft support holes 111 and 121 penetrating through the cylinder blocks 11 and 12, and the rotary shaft 21 passes through the cylinder support holes 111 and 121 to the cylinder blocks 11 and 12. Is directly supported by

A swash plate 23 is formed on the rotation shaft 21, which is accommodated in the swash plate chamber 24 between the cylinder blocks 11, 12. A thrust bearing 25 is interposed between the end face of the cylinder block 11 and the base 231 of the swash plate 23.

As shown in FIG. 2, the cylinder block 11 is formed so that a plurality of cylinder bores 27 are arranged around the rotation shaft 21.

Both cylinder pistons 29 are accommodated in the cylinder bores 27 and 28 formed in the cylinder block 11.

As shown in Fig. 1 (a), the rotational movement of the swash plate 23 which is integrally rotated with the rotation shaft 2l is transmitted to the sheepskin piston 29 through the shoe 30, and the sheepskin piston 29 is Reciprocate the cylinder bore (27, 28) back and forth. The double head piston 29 partitions the compression chambers 271 and 281 in the cylinder bores 27 and 28.

The rotating shaft 21 is directly supported by the cylinder blocks 11 and 12 via the sealing main surfaces 112 and 122.

The supply passage 211 is formed in the rotating shaft 21. The start end of the supply passage 211 is at the inner end face of the rotating shaft 21 and communicates with the suction chamber 142 in the rear housing 14. The introduction shafts 31 and 32 are formed in the rotation shaft 21 so as to communicate with the supply passage 211.

As shown in FIG. 2, the cylinder block 11 has a suction passage 33 formed to communicate with the cylinder bore 27 and the shaft support hole 111, and the inlet 331 of the suction passage 33 is formed. And an opening on the sealing main surface 112.

As the rotation shaft 21 rotates, the outlets 311 and 321 of the introduction passages 31 and 32 intermittently communicate with the inlets 331 and 341 of the suction passages 33 and 34.

When the cylinder bore 27 is in the state of the suction stroke (i.e., the stroke in which the double head piston 29 moves from the left side to the right side in FIG. 1A), the inlet 311 and the inlet passage 33 331 is in communication. When the cylinder bore 27 is in the intake stroke state, the refrigerant in the supply passage 211 of the rotating shaft 21 passes through the introduction passage 31 and the suction passage 33 (the compression chamber of the cylinder bore 27) 271).

When the cylinder bore 27 is in the discharge stroke state (i.e., the stroke in which the both head pistons 29 move from the right side to the left side in Fig. 1A), the outlet 311 is the inlet of the suction passage 33 331 is blocked, and when the cylinder bore 27 is in the discharge stroke state, the refrigerant in the compression chamber 271 pushes the discharge lead 161 out of the discharge hole 151 and discharges it to the discharge chamber 131. The refrigerant discharged into the discharge chamber 131 flows out to an external refrigerant circuit (not shown). The refrigerant flowing out of the external refrigerant circuit is returned to the suction chamber 142.

In the conventional compressor, some of the refrigerant and oil are accommodated in the swash plate chamber between the piston and the main surface of the cylinder bore during the compression stroke of the cylinder bore, but most of the refrigerant compressed in the cylinder bore is transferred to the external refrigerant circuit through the discharge chamber. Most of the oil introduced into the cylinder bore is discharged to the external refrigerant circuit together with the refrigerant discharged to the external refrigerant circuit.

Accordingly, a lack of lubricating oil is generated in the swash plate chamber, and there is a problem that sufficient lubricating oil is not supplied to a sliding part such as between the shoe and the swash plate which transmits the rotational movement of the swash plate to the piston.

The present invention has been made to solve the above problems, by installing an oil separation member in the main refrigerant suction flow path of the compressor to separate the refrigerant and oil, and to supply the separated oil to the swash chamber, to improve the lubricity in the swash chamber It is to provide a compressor.

The present invention for achieving the above object, the front and rear housings 410, 420, the swash plate rotating in the swash plate chamber 436 formed inside the front and rear cylinder blocks 430, 440, respectively ( 460 is integrally coupled to the drive shaft 450, and the pistons 470 respectively accommodated in the plurality of cylinder bores 431 and 441 arranged annularly around the drive shaft 450 are adapted to the rotation of the swash plate 460. The refrigerant suctioned from the swash plate chamber 436 to the main refrigerant suction passage 451 formed inside the drive shaft 450 is rotated by the drive shaft 450 so as to reciprocate in interlocking motion. Cylinder bores 431 and 440 through a plurality of suction passages 432 and 442 formed in the front and rear cylinder blocks 430 and 440 so as to sequentially communicate the cylinder bores 431 and 441. In the compressor sucked into the 441, the swash plate chamber 436 and the main refrigerant suction flow path 451 on the side of the drive shaft 450 An oil return hole 490 is formed to communicate with each other, and is provided in the main refrigerant suction flow path 451 of the drive shaft 450 and includes at least one oil separation pin 610 and 620 having a spiral shape. It characterized in that it comprises an oil separating member 600 for separating the oil flowing in the main refrigerant suction passage 451 and the refrigerant.

Here, the oil separation member support 500 for supporting the oil separation member 600 is formed on the inner circumferential surface of the drive shaft 450, and the oil separation member support 500 is an inlet inner surface of the oil return hole 490. It is preferable that the end portion is formed around the inner circumferential surface of the drive shaft 450 in a state of being in contact with it.

In addition, the oil separation pins 610 and 620 are preferably formed such that the spiral advancing direction faces the adjacent oil separation member support 500.

In addition, the piston 470 is a double-headed piston, the cylinder bore (431, 441) is formed on both sides of the swash plate chamber 436, the main refrigerant suction flow path 451 of the drive shaft 450 is a front, At least one is formed at the front and the rear to correspond to each of the cylinder bores 431 and 441 at the rear, and the swash plate 460 has a main refrigerant suction flow path 451 of the swash plate chamber 436 and the drive shaft 450. It is preferable that a coolant communication path 437 communicating with the inlet 452 is formed.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the present specification and claims should not be construed as being limited to the common or dictionary meanings, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that it can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention.

Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

3 is a cross-sectional view of a compressor according to an embodiment of the present invention, FIG. 4 is a perspective view of a drive shaft according to an embodiment of the present invention, and FIG. 5 is a cross-sectional view of a drive shaft according to an embodiment of the present invention.

As shown, in the compressor 400 of the present embodiment, the swash plate 460 rotating in the swash plate chamber 436 inside the compressor 400 is inclinedly coupled thereto, and the refrigerant sucked into the swash plate chamber 436 is inside. A drive shaft 450 in which a main refrigerant suction passage 451 is formed to move to the cylinder bores 431 and 441; In addition to the shaft support hole (433, 443) that the drive shaft 450 is rotatably installed, a plurality of cylinder bores (431, 441) is formed, the main refrigerant suction flow path (451) of the drive shaft (450) The main refrigerant suction passage 451 and the cylinder bores 431 and 441 communicate with each other so that the refrigerant sucked into the suction shaft can be sequentially sucked into each cylinder bore 431 and 441 when the driving shaft 450 rotates. A front and rear cylinder blocks 430 and 440 on which suction passages 432 and 442 are formed; A plurality of pistons 470 mounted on an outer circumference of the swash plate 460 via a shoe 465 and reciprocating in conjunction with a rotational movement of the swash plate 460; Front and rear housings 410 and 420 coupled to both sides of the cylinder blocks 430 and 440 and having discharge chambers 411 and 421 formed therein, respectively; A valve unit 480 interposed between the cylinder blocks 430 and 440 and the front and rear housings 410 and 420, respectively; An oil return hole 490 is formed at a side surface of the drive shaft 450 to communicate the swash plate chamber 436 and the main refrigerant suction passage 451, and is formed in the main refrigerant suction passage 451 of the drive shaft 450. It is provided, and is provided in the main refrigerant suction passage 451 of the drive shaft 450, consisting of at least one oil separation pin 610, 620 having a spiral shape for flowing the main refrigerant suction passage 451. It consists of an oil separation part 600 for separating the oil and the refrigerant.

Both sides of the drive shaft 450 are rotatably installed in the shaft support holes 433 and 443 of the front and rear cylinder blocks 430 and 440, and one end thereof extends through the front housing 410. It is coupled to an electromagnetic clutch (not shown), and the other end is penetrated to communicate with the refrigerant storage chamber 424 of the rear housing 420 to be described below.

The swash plate 460 rotating in the swash plate chamber 436 is inclinedly coupled to the drive shaft 450, and there is a swash plate chamber 436 through a suction port (not shown) of the rear cylinder block 440. A main refrigerant suction passage 451 is formed therein to communicate the swash plate chamber 436 and the cylinder bores 431 and 441 so that the suction refrigerant sucked into the cylinder bores 431 and 441 can be moved.

Here, at least one main refrigerant suction passage 451 is formed at the front and the rear so as to correspond to the cylinder bores 431 and 441 at the front and rear, respectively.

A coolant communication path 437 is formed in the swash plate 460 so that the inlet 452 of the main refrigerant suction flow path 451 communicates with the swash plate chamber 436, and the outlet 453 is the front and rear cylinder blocks. It is formed to communicate with each of the suction passages (432, 442) (430, 440).

That is, the inlet 452 of the main refrigerant suction passage 451 is in communication with the refrigerant communication path 437 formed in the hub 461 of the swash plate 460 while passing through one side of the drive shaft 450 to the swash plate. The refrigerant in the seal 436 is transferred into the drive shaft 450.

Meanwhile, only one inlet 452 of the main refrigerant suction passage 451 may be formed at one side of the driving shaft 450 or two may be formed in opposite directions.

In addition, an oil return hole 490 is formed at one side of the driving shaft 450 to communicate with the main refrigerant suction passage 451 and the swash plate chamber 436.

In addition, an oil separation member support part 500 is formed around the inner circumferential surface of the driving shaft 450.

Here, the oil separation member support 500 is preferably formed to abut the inner surface of the inlet of the oil return hole (490).

The oil separation member support unit 500 supports the oil separation member 600 to be described below in a state installed in the main refrigerant suction flow path 451, and is refrigerant by the oil separation member 600. The oil separated from the oil is collected to be smoothly discharged to the swash plate chamber 436 through the oil return hole 490.

In addition, the main refrigerant suction passage 451 is provided with an oil separation member 600 for separating oil from the refrigerant between the oil separation member support 500.

The oil separation member 600 includes at least one oil separation pin 610 and 620 having a symmetric spiral shape.

In the present invention, the oil separation member 600 is described as an embodiment consisting of an oil separation pin 610 and a rear oil separation pin 620 at the front, but is not limited thereto. ) And the oil separation pin 620 of the rear may be used integrally attached to the end portion in contact with each other.

Here, the front oil separating pins 610 and the rear oil separating pins 620 are in contact with each other at one end of the driving shaft 450 so as to contact each other end with the oil separating member support 500. ) Install inside.

In addition, the front oil separation pin 610 and the rear oil separation pin 620 are formed to face the oil separation member support 500 adjacent to the spiral running direction in the state installed inside the drive shaft 450. It is preferable.

That is, by forming the spiral running direction of the front oil separation pin 610 and the rear oil separation pin 620 toward the adjacent oil separation member support 500, the oil separated from the refrigerant is separated from the oil Easily collected by the member support 500, the oil is easily discharged to the oil return hole 490 during the rotation of the drive shaft 450.

Accordingly, the refrigerant and oil introduced into the main refrigerant suction channel 451 through the inlet 452 of the main refrigerant suction channel 451 are connected to both ends of the main refrigerant suction channel 451 as the drive shaft 450 rotates. Move.

At this time, the oil having a heavy specific gravity during the rotation of the drive shaft 450 is granulated while contacting the front oil separation pin 610 and the rear oil separation pin 620, the oil separation pin 610 and the front After moving in the direction of the oil separation member support 500 along the surface of the rear oil separation pin 620, the oil return hole 490 returns to the swash plate chamber 436.

In addition, the oil having a high specific gravity may move to both ends of the main refrigerant suction passage 451 along the surface of the main refrigerant suction passage 451, that is, the inner circumferential surface of the drive shaft 450 by centrifugal force caused by the rotation of the drive shaft 450. After moving, the moving oil is flowed into the oil return hole 490 in the state collected by the oil separation member support 500, and then returns to the swash chamber 436 through the oil return hole 490. do.

That is, the present embodiment uses the centrifugal force by the rotation of the drive shaft 450 to the oil using the oil separation member 600 composed of the front oil separation pin 610 and the rear oil separation pin 620. After separating from the refrigerant, the flow is returned to the swash plate chamber 436 so that the lubricating oil is sufficiently supplied into the swash plate chamber 436.

Meanwhile, the refrigerant having a relatively low specific gravity is moved to the cylinder bores 431 and 441 through the outlet 453 of the main refrigerant suction passage 451 to be described later in a state of being separated from the oil.

The outlet 453 of the main refrigerant suction passage 451 is formed on both sides of the main refrigerant suction passage 451 in opposite directions so that each cylinder bore provided in the swash plate chamber 436 when the drive shaft 450 rotates. At 431 and 441, the refrigerant can be sucked at the same time.

Of course, the direction of each outlet 453 of the main refrigerant suction passage 451 formed in the drive shaft 450 may vary depending on the design purpose such as the number of the piston 470.

In addition, the front and rear cylinder blocks 430 and 440 are each formed with a plurality of cylinder bores 431 and 441 on both sides of the swash plate chamber 436, and the drive shaft 450 is rotatable at the center thereof. Axial support holes 433 and 443 are formed to be supported.

Here, needle roller bearings 438 and 448 are provided in the shaft support holes 433 and 443 to rotatably support the drive shaft 30.

In the front and rear cylinder blocks 430 and 440, the refrigerant sucked from the swash plate chamber 436 into the main refrigerant suction passage 451 of the drive shaft 450 sequentially rotates each cylinder bore when the drive shaft 450 rotates. Suction passages 432 and 442 are formed to communicate the shaft supporting holes 433 and 443 and the cylinder bores 431 and 441 to be sucked into the 431 and 441.

In addition, an outer surface of one of the front and rear cylinder blocks 430 and 440 and a suction port (not shown) in communication with the swash plate chamber 436 to supply an external refrigerant to the swash plate chamber 436. The discharge ports 447 communicating with the discharge chambers 411 and 421 are formed to discharge the refrigerant in the discharge chambers 411 and 421 of the front and rear housings 410 and 420 to the outside.

Accordingly, the discharge passage 434 connecting the discharge chambers 411 and 421 of the front and rear housings 410 and 420 and the discharge port 447 to the front and rear cylinder blocks 430 and 440. 444 is formed, wherein the outer surface of the cylinder block (430, 440) muffler (435) is expanded to the discharge passage (434, 444) to reduce the pulsation pressure of the discharge refrigerant to reduce noise 445 is formed.

In addition, the valve unit 480 communicates with each of the cylinder bores 431 and 441 and the discharge chambers 411 and 421 of the front and rear housings 410 and 420. ) Is formed of a valve plate 481 and a discharge lead 482 installed on one side of the valve plate 481 to open and close the refrigerant discharge hole 481a.

In the valve plate 481, the refrigerant in the discharge chambers 411 and 421 of the front and rear housings 410 and 420 is discharge passages 434 of the front and rear cylinder blocks 430 and 440. A communication path 481b is formed to communicate the discharge chambers 411 and 421 and the discharge passages 434 and 444 so as to be discharged to the discharge port 447 via the 444.

The valve unit 480 is provided with fixing pins (not shown) provided at both sides of the valve plate 481, the front and rear housings 410 and 420 and the front and rear cylinder blocks 430 and 440. It is coupled and fixed while being inserted into the fixing hole (not shown) formed on the opposite surface of the.

Meanwhile, the front and rear housings 410 and 420 are formed with a plurality of bolt fastening holes 413 and 423 at edges of the inside, and the front and rear through the bolt fastening holes 413 and 423. The housings 410 and 420 are fastened and fixed by mutual bolts 700 in the state in which the above components are assembled.

Here, the coolant storage chamber 424 may be formed in the rear housing 420 so as to be separated from the discharge chamber 421 inside the discharge chamber 421.

The refrigerant storage chamber 424 communicates with the main refrigerant suction passage 451 of the drive shaft 450.

As such, when the refrigerant storage chamber 424 is provided in the rear housing 420, the rear surface of the rear housing 420 may supply sufficient refrigerant to the cylinder bores 431 and 441 even when the drive shaft 45 rotates at high speed. An auxiliary refrigerant suction passage 449 communicating with the swash plate chamber 436 and the refrigerant storage chamber 424 may be further formed in the cylinder block 440.

As described above, in the compressor 400 according to the present invention, when the driving shaft 450 selectively receives power from an electronic clutch (not shown) rotates, the swash plate 460 rotates, and the swash plate ( A plurality of double-headed pistons 470 in conjunction with the rotational movement of the 460 reciprocates inside the cylinder bores 431 and 441 of the front and rear cylinder blocks 430 and 440 to inhale and compress the refrigerant. Will be repeated.

That is, in the suction stroke of the piston 470, an external refrigerant is supplied into the swash plate chamber 436 through the suction port (not shown) and then supplied to the main refrigerant suction flow path 451 of the drive shaft 450. The refrigerant is separated from the oil by the oil separating member 600 of the main refrigerant suction passage 451 and then directly supplied into the cylinder bores 431 and 441, while the separated oil is supplied to the oil return hole 490. Return to the judge's chamber (436).

The refrigerant supplied into the cylinder bores 431 and 441 is compressed by the piston 470 in the cylinder bores 431 and 441 during the compression stroke, and then the discharge chambers of the front and rear housings 410 and 420. 411 and 421 are discharged to the discharge port 447 through the discharge passage 434 and 444 and the muffler 435 and 445 of the front and rear cylinder blocks 430 and 440.

As described above, in the present invention, the main refrigerant suction flow path 451 is formed in the drive shaft 450 to cool the refrigerant in the swash plate chamber 436 through the refrigerant communication path 437 formed in the swash plate 460. Only the fixed-capacity swash plate compressor 400 to which the drive shaft-integrated suction rotary valve configuration, which moves to the main refrigerant suction passage 451 and is directly supplied to the cylinder bores 431 and 441, has been described. However, the present invention is not limited thereto, and the compressor having the structure as shown in FIG. 1, that is, the inlet 452 of the main refrigerant suction flow path 451 of the drive shaft 450 communicates directly with the swash plate chamber 436 and the rear housing 420. ) Is provided with a refrigerant storage chamber 424 in communication with the main refrigerant suction passage 451, and the rear cylinder block 440 is an auxiliary refrigerant for communicating the swash plate chamber 436 and the refrigerant storage chamber 424. Compressor of the structure that does not form the suction flow path (449) Group can be applied in the same way and configured in a wide variety of compressors, such as compressors, and, it is possible to obtain the same effect.

According to the present invention described above, after the oil return hole and the oil separation member support part are formed in the main refrigerant suction flow path of the drive shaft to separate the refrigerant and the oil by centrifugal force generated when the drive shaft rotates, the oil is separated into the oil return hole. Lubrication in the swash plate chamber is improved by supplying it to the swash plate chamber.

In addition, after the at least one oil separation pin, which is an oil separation member, is directed toward the oil separation member support portion, the end direction of the oil separation member is installed in the main refrigerant suction flow path so as to contact the oil separation member support portion. The amount of oil returned to the yarn is increased, thereby improving the lubricity in the swash plate chamber.

Claims (4)

The swash plate 460 rotating in the swash plate chamber 436 formed inside the front and rear cylinder blocks 430 and 440 to which the front and rear housings 410 and 420 are respectively coupled is integrally coupled to the drive shaft 450. The pistons 470 respectively accommodated in the plurality of cylinder bores 431 and 441 arranged annularly around the drive shaft 450 reciprocate in conjunction with the rotation of the swash plate 460, and the swash plate chamber 436 Refrigerant sucked into the main refrigerant suction passage 451 formed inside the drive shaft 450 is rotated by the drive shaft 450 and the main refrigerant suction passage 451 and the cylinder bores 431 and 441. In the compressor is sucked into each of the cylinder bores (431, 441) through a plurality of suction passages (432, 442) formed in the front and rear cylinder blocks (430, 440) to sequentially communicate with, An oil return hole 490 is formed at a side surface of the drive shaft 450 to communicate the swash plate chamber 436 and the main refrigerant suction passage 451. The refrigerant is provided in the main refrigerant suction passage 451 of the drive shaft 450 and has at least one oil separation pin 610 and 620 having a spiral shape to cool the oil flowing through the main refrigerant suction passage 451. And an oil separation member (600) for separating from each other, and an oil separation member support part (500) for supporting the oil separation member (600) is formed on an inner circumferential surface of the drive shaft (450). The method of claim 1, The oil separation member support unit 500 is an end portion formed around the inner circumferential surface of the drive shaft 450 in a state of abutting the inner surface of the inlet of the oil return hole (490). The method of claim 1, The oil separation pin (610) (620) is characterized in that the spiral travel direction is formed so as to face the adjacent oil separation member support (500). The method according to any one of claims 1 to 3, The piston 470 is a double headed piston, the cylinder bore (431, 441) is formed in a plurality of both sides of the swash plate chamber 436, At least one main refrigerant suction passage 451 of the drive shaft 450 is formed at the front and the rear to correspond to the cylinder bores 431 and 441 at the front and rear, respectively. The swash plate (460) is characterized in that the refrigerant communication passage (437) is formed in communication with the swash plate chamber (436) and the main refrigerant suction passage (451) inlet (452) of the drive shaft (450).

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