KR20210111439A - Swash plate compressor with oil separator - Google Patents

Abstract

A swash plate compressor includes: a housing forming a cylinder bore; a driving shaft installed in the housing to be rotatable and forming an oil passage; a swash plate placed in the housing while kept coupled with the driving shaft to be rotated together with the driving shaft; a plurality of pistons placed in the cylinder bore while kept connected with the swash plate to perform reciprocation in accordance with the rotation of the swash plate; a rear head coupled with the rear side of the housing and forming a discharge port; and an oil separator installed at the discharge port of the rear head to separate oil mixed with a refrigerant. The oil passage is extended in a longitudinal direction of the driving shaft while kept exposed to one end of the driving shaft such that the oil separated by the oil separator can be introduced. The driving shaft includes an oil discharge hole formed to be connected to the oil passage such that the oil in the oil passage can be discharged to both sides of the swash plate. Therefore, the present invention is capable of effectively supplying the oil separated by the oil separator to an operation component such as a thrust bearing.

Description

Swash plate compressor with oil separator

The present invention relates to a swash plate compressor for a vehicle.

A swash plate compressor is widely used in an air conditioning device for a vehicle. In general, a swash plate compressor includes a swash plate that rotates together with a drive shaft, and a piston engaged with the swash plate reciprocates by rotation of the swash plate to suction and compress refrigerant.

In the swash plate type compressor, oil is mixed with the refrigerant for lubrication, and the oil mixed with the refrigerant performs a lubricating function, but is a factor that lowers the cooling performance. Therefore, a technology for installing an oil separator for separating oil mixed with the refrigerant discharged from the swash plate compressor has been introduced.

In order to inject the oil separated in the swash plate compressor having such an oil separator to the operating elements in the compressor, a method of forming an oil passage in the drive shaft has been introduced. It is necessary to allow the oil separated by the oil separator to reach the working elements effectively to achieve smooth lubrication.

Republic of Korea Patent Publication No. 10-0282042 (Announcement date: February 15, 2001) Republic of Korea Patent Publication No. 10-1811390 (Announcement date: December 21, 2017)

SUMMARY OF THE INVENTION An object of the present invention is to provide a swash plate compressor having excellent lubrication performance by allowing oil separated in an oil separator to reach an operating element in the compressor effectively.

The swash plate compressor according to an embodiment of the present invention includes a housing forming a cylinder bore, a drive shaft rotatably installed in the housing and forming an oil passage, and the drive shaft in a state of being fastened to the drive shaft to rotate together with the drive shaft. A swash plate disposed in the housing, a plurality of pistons disposed in the cylinder bore in a state of being connected to the swash plate to reciprocate in response to rotation of the swash plate, a rear head fastened to the rear of the housing and forming a discharge port, and It is installed in the discharge port of the rear head and includes an oil separator for separating the oil mixed with the refrigerant. The oil passage extends in the longitudinal direction of the drive shaft while being exposed to one end of the drive shaft so that the oil separated by the oil separator can be introduced. The drive shaft has an oil discharge hole formed in communication with the oil passage so that the oil in the oil passage can be discharged to both sides of the swash plate.

The swash plate compressor according to an embodiment of the present invention may further include thrust bearings supporting both sides of the swash plate, and the oil discharge hole is formed such that an outlet is located between the side surface of the swash plate and the thrust bearing. can be

The oil discharge hole may extend in a radial direction to connect the oil passage and an outer circumferential surface of the drive shaft.

An oil groove connected to the oil discharge hole and extending in a radial direction may be formed on a side surface of the swash plate.

According to the present invention, the oil separated by the oil separator can be discharged to both sides of the swash plate in the swash plate compressor through the oil passage and the oil discharge hole of the drive shaft, so that it can be effectively supplied to an operating element such as a thrust bearing. .

1 is a cross-sectional view of a swash plate compressor according to an embodiment of the present invention.
2 is a partially cut-away cross-sectional view of a drive shaft, a swash plate, and a piston of a swash plate compressor according to an embodiment of the present invention.
3 is a front view of a drive shaft and a swash plate of a swash plate compressor according to an embodiment of the present invention.
4 is a cross-sectional view taken along line IV-IV of FIG. 3 .

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

An embodiment of the present invention relates to a swash plate compressor, and can be applied to both a variable capacity swash plate compressor in which the compression capacity is varied while the inclination angle of the swash plate is changed, and a fixed capacity swash plate compressor in which the inclination angle of the swash plate is maintained constant. have. Hereinafter, a fixed displacement swash plate compressor will be described as an example.

Referring to FIG. 1 , the housing 10 includes a cylinder block 11 therein, and the cylinder block 11 may be integrally formed with a portion forming the outside of the housing 10 or as a separate member. It may be assembled after being formed. The cylinder block 11 defines therein a plurality of cylinder bores 13 extending longitudinally, ie transversely in FIG. 1 .

The drive shaft 15 is rotatably mounted to the housing 10 . For example, as shown in FIG. 1 , the drive shaft 15 may be mounted to the housing 10 in a state where a part of the drive shaft 15 is exposed to the front of the housing 10 . The drive shaft 15 may be connected to a power transmission unit 20 that is formed to selectively receive power.

The swash plate 17 is fastened to the drive shaft 15 to rotate together with the drive shaft 15 . Both sides of the swash plate 17 may be supported by thrust bearings 18 .

Meanwhile, the plurality of pistons 23 are fastened to the swash plate 17 , and the plurality of pistons 23 are respectively disposed in the plurality of cylinder bores 13 to be reciprocally moved. The piston 23 may be connected to the swash plate 17 by a piston shoe 24 . The plurality of pistons 23 reciprocate in the longitudinal direction in response to the rotation of the swash plate 17 , and the refrigerant is sucked, compressed, and discharged by the reciprocating motion of the plurality of pistons 23 .

The front head 25 and the rear head 27 are respectively fastened to the front and rear of the housing 10 . At this time, the front valve plate 29 and the gasket 31 may be respectively disposed between the front head 25 and the housing 10 for sealing, and similarly, the rear valve between the housing 10 and the rear head 27 . The plate 33 and the gasket 35 may be respectively disposed. At this time, although the gasket 31 is illustrated as being disposed on both sides of the front valve plate 29 in FIG. 1 , the gasket 31 may be disposed only on one side of the front valve plate 29 . Similarly, although the gasket 35 is illustrated as being disposed on both sides of the rear valve plate 33 in FIG. 1 , the gasket 35 may be disposed only on one side of the rear valve plate 33 .

The rear head 27 forms a discharge port 37 through which the compressed refrigerant is discharged. The refrigerant compressed by the operation of the piston 23 moves to the rear of the housing 10 and is discharged to the outside through the discharge port 37 .

An oil separator 41 is disposed in the discharge port 37 . The oil separator 41 operates to separate the oil mixed with the refrigerant discharged through the discharge port 37 . The oil separator 41 may be connected to the discharge chamber through the connection passage 38 , and as a mixture of oil and refrigerant discharged through the connection passage 38 collides with the oil separator 41 , the refrigerant and oil are separated. The oil separator 41 may be implemented as a pipe member comprising parts having different widths through which the refrigerant discharged through the discharge port 37 passes, and the oil separator 41 is a refrigerant discharged at high pressure through the oil separator ( 41), the oil contained in the refrigerant collides with the wall of the oil separator 41 by centrifugal force to separate the oil. Since the oil separator 41 may have the same shape and operation method as that of an oil separator used in a conventional scroll compressor, a more detailed description thereof will be omitted.

An oil reservoir 43 in which the oil separated by the oil separator 41 is stored is provided. For example, the oil reservoir 43 may be disposed in the rear head 27 as shown in FIG. 1 . At this time, the oil reservoir 43 is disposed below the oil separator 41 , so that the oil separated from the oil separator 41 can easily move to the oil reservoir 43 by gravity.

The oil chamber 50 is connected to the oil reservoir 43 through the oil transfer passage 60 , and oil from the oil reservoir 43 is supplied to the oil chamber 50 through the oil transfer passage 60 .

The oil chamber 50 is formed in the rear head 27 , and is formed in a position corresponding to the oil passage 16 formed in the longitudinal direction in the drive shaft 15 . That is, as shown in FIG. 1 , the oil chamber 50 may be formed in the center of the rear head 27 and is disposed to face the rear end of the drive shaft 15 . At this time, the drive shaft 15 may be formed as a hollow shaft to have an oil passage 16 extending in the longitudinal direction, and one end (right end in FIG. 1 ) of the oil passage 16 facing the oil chamber 50 . ) is open. Oil is introduced through the open oil passage 16 .

At this time, as shown in FIG. 1 , the lower end of the oil reservoir 43 may be located lower than the lower end of the oil chamber 50 , and the oil passage 60 is transverse to the lower end of the oil reservoir 43 . an upstream passage 61 extending forwardly in the direction, and a downstream passage 65 extending in an inclined upward direction from the upstream passage 61 and connected to the oil chamber 50 . As shown in FIG. 1 , the upstream passage 61 extends in a lateral direction substantially perpendicular to the oil reservoir 43 extending in the vertical direction, and the front surface of the rear head 27 facing the housing 10 . can be extended up to

The downstream passage 65 may extend upward at an end of the connection passage 63 in a state that is inclined in a direction away from the housing 10 . That is, as shown in FIG. 1 , the downstream passage 65 may extend so that the upper end thereof is inclined away from the housing 10 . The end of the downstream passage 65 may be connected to the bottom of the rear portion of the oil chamber 50 .

A bleed plug 70 is disposed in the oil chamber 50 . 1 , the front portion of the bleed plug 70 may be installed to pass through the rear valve plate 33 , and the rear portion may be disposed in the oil chamber 50 . The plug member 7 forms a bleed hole 71 serving as an oil passage, and the bleed hole 71 communicates the oil chamber 50 and the oil passage 16 of the drive shaft 15 . . Meanwhile, a screen 80 for removing impurities contained in oil may be installed at the rear end of the bleed plug 70 . With this structure, the oil separated by the oil separator 41 may flow into the oil passage 16 of the drive shaft 15 .

The oil passage 16 extends along the longitudinal direction of the drive shaft 15 , and the drive shaft 15 forms an oil discharge hole 30 connecting the inner oil passage 16 and the outer circumferential surface. The oil discharge hole 30 may be formed such that the outlet, that is, the radially outer end, is positioned between the swash plate 17 and the thrust bearing 18 . The oil discharge hole 30 may extend in a radial direction, and a plurality of oil discharge holes 30 may be radially arranged. In addition, oil grooves 21 that are connected to the oil discharge hole 30 and extend radially outward of the swash plate 17 may be formed on both sides of the swash plate 17 . With this structure, the oil can effectively reach the thrust bearing 18 , which is an operating element particularly requiring lubrication, and moves radially outward of the swash plate 17 through the oil groove 21 to rotate the swash plate 17 . It can be scattered radially outwardly by means of which can be evenly distributed over several actuating elements.

Although the embodiment of the present invention has been described above, the scope of the present invention is not limited thereto, and it is easily changed by a person skilled in the art from the embodiment of the present invention and recognized as equivalent. including all changes and modifications to the scope of

10: housing
11: cylinder block
13: cylinder bore
15: drive shaft
16: oil passage
17: swash plate
18: thrust bearing
23: piston
25: front head
27: rear head
37: exhaust port
41: oil separator
43: oil reservoir
50: oil chamber
60: oil passage passage
70: bleed plug
71: bleed hole
30: oil drain hole
21: oil groove

Claims (4)

a housing forming a cylinder bore;
a drive shaft rotatably installed in the housing and forming an oil passage;
a swash plate disposed in the housing while being fastened to the drive shaft to rotate together with the drive shaft;
A plurality of pistons disposed in the cylinder bore in a state connected to the swash plate to reciprocate in response to the rotation of the swash plate,
a rear head fastened to the rear of the housing and defining an exhaust port; and
An oil separator installed in the discharge port of the rear head to separate the oil mixed with the refrigerant
including,
The oil passage extends in the longitudinal direction of the drive shaft while being exposed to one end of the drive shaft so that the oil separated in the oil separator can be introduced;
The drive shaft has an oil discharge hole formed in communication with the oil passage so that the oil in the oil passage can be discharged to both sides of the swash plate.
Swash plate compressor. In claim 1,
Further comprising a thrust bearing supporting both sides of the swash plate,
The oil discharge hole is formed such that an outlet is located between a side surface of the swash plate and the thrust bearing.
Swash plate compressor. In claim 2,
The oil discharge hole extends in a radial direction to connect the oil passage and an outer circumferential surface of the drive shaft. In claim 1,
A swash plate compressor in which an oil groove extending in a radial direction is formed on a side surface of the swash plate, which is connected to the oil discharge hole.

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