KR20150104995A

KR20150104995A - Apparatus for separating oil of variable swash plate compressor

Info

Publication number: KR20150104995A
Application number: KR1020140027087A
Authority: KR
Inventors: 배상우
Original assignee: 한온시스템 주식회사
Priority date: 2014-03-07
Filing date: 2014-03-07
Publication date: 2015-09-16
Also published as: KR102016962B1

Abstract

The present invention relates to an oil separator for a variable swash plate type compressor. The oil separator includes a plurality of branch conduits through which oil discharged from the oil separator flows into and stored in a cylinder block, and an oil reservoir connected to the branch conduits. The residual oil amount in the interior increases, thereby eliminating the problem of durability reduction due to oil shortage.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil separator for a variable swash plate type compressor,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an oil separator for a variable swash plate type compressor, and more particularly, to an oil separator for a variable swash plate type compressor capable of retaining a larger amount of oil in a compressor.

Compressors for compressing refrigerant in automotive air conditioning systems have been developed in various forms. The compressor includes a reciprocating type in which compression is performed while a refrigerant compressing portion reciprocates, and a rotary type in which compression is performed while rotating. The reciprocating type includes a crank type that transmits the driving force of the driving source to a plurality of pistons by using a crank, a swash plate type which is transmitted to a swash plate mounted on the rotating shaft, a wobble plate type that uses a wobble plate, and a rotary shaft and a vane Vane rotary type, and scroll type using revolving scroll and fixed scroll.

The swash plate type compressor includes a fixed displacement type and a variable displacement type. These compressors are driven by receiving power from an engine of a vehicle through a belt. In the fixed displacement type, an electromagnetic clutch is provided to control the operation of the swash plate type compressor. However, in the case of the fixed capacity type having the electromagnetic clutch, there is a problem that the RPM of the vehicle flows when the compressor is driven or stopped, thereby hindering stable vehicle operation.

Therefore, in recent years, a variable displacement type which is not equipped with a clutch and is always driven with the engine drive of the vehicle, and which can change the discharge capacity by changing the inclination angle of the swash plate is widely used. In such a variable displacement swash plate type compressor, a pressure control valve for adjusting the inclination angle of the swash plate is used for adjusting the refrigerant discharge amount.

FIG. 1 is a configuration diagram of a variable capacity swash plate type compressor, and FIG. 2 is a view showing an example of an oil separation apparatus applied to a conventional variable capacity swash plate type compressor. The structure of the conventional variable displacement swash plate type compressor will be described with reference to FIGS. 1 and 2. FIG.

The front head 120 and the rear head 130 are coupled to the front and rear sides of the cylinder block 110 in which the plurality of cylinder bores 111 are formed to form the housing 100. In the center portion of the cylinder block 110, A center bore 112 is formed.

A crank chamber 121 is formed on the inside of the front head 120 and a suction chamber 131 and a discharge chamber 132 are formed on the inside of the rear head 130.

The rotary shaft 200 is installed to be rotatable through the crank chamber 121. The front end of the rotary shaft 200 is disposed to protrude from the front head 120 and a pulley 140 for driving the belt is mounted. And an oil separator 220 is installed at an end portion of the center bore 112 inserted into the center bore 112. [

The swash plate 300 is installed on the rotary shaft 200 so as to rotate integrally with the rotary shaft 200 and to adjust the angle of the rotary shaft 200 so that the refrigerant discharge amount can be adjusted.

A plurality of pistons 400 are connected to the edge portion of the swash plate 300 via shoe 310 and the swash plate 300 is rotated in a tilted state to thereby move along the inner peripheral surface of the cylinder bore 111 of the piston 400 The refrigerant is compressed by the linear reciprocating motion.

A valve unit 500 for opening and closing a refrigerant moving path is provided between the cylinder block 110 and the rear head 130. A suction valve and a discharge valve of the same number as the cylinder bore 111 are formed in the valve unit 500 do.

A variable swash plate compressor having the above-described configuration is disclosed in Japanese Patent Laid-Open No. 10-2013-0121330 (published on November 11, 2013).

A storage chamber 113 is formed at the rear end of the center bore 112 and an oil separator 220 is disposed in the storage chamber 113. The oil separator 220 is attached to the rear end of the rotary shaft 200 and is integrally rotated together with the rotary shaft 200. In the circumferential wall of the oil separator 220, an oil discharge hole 221 through which oil centrifugally separated from the refrigerant is discharged is formed. A refrigerant discharge hole 222 through which the oil-separated refrigerant gas is discharged is formed in an end wall of the oil separator 220.

A through hole 510 communicating with the suction chamber 131 is formed in the valve assembly 500 facing the refrigerant discharge hole 222.

The rotary shaft (200) has a refrigerant passage (210) formed axially in the center thereof. One end of the refrigerant passage 210 communicates with the crank chamber 121 through a refrigerant passage (not shown) formed in the rotor 320 and the other end communicates with the inner space of the oil separator 220.

The cylinder block 110 is formed with an air supply passage 114 connecting the discharge chamber 132 of the rear head 130 and the crank chamber 121 of the front head 120, 114 are connected to each other.

The refrigerant flowing into the refrigerant passage 210 of the rotary shaft 200 is discharged to the oil separator 220. Since the rotary shaft 200 and the oil separator 220 are both rotated at this time, The oil is accumulated and accumulated on the inner circumferential surface of the oil separator 220. When the amount of accumulation is increased, the oil is discharged to the storage chamber 113 through the oil discharge hole 221 formed in the circumferential wall of the oil separator 220 .

The oil flows to the air supply passage 114 through the connection passage 115 and then flows back to the crankshaft of the front head 120 in accordance with the flow of the refrigerant flowing through the air supply passage 114. [ Is supplied to the chamber 121, and then supplied again to the portion where lubrication is required.

The refrigerant separated from the oil in the oil separator 220 is discharged to the refrigerant discharge hole 222 and then discharged to the suction chamber 131 through the through hole 510 to be mixed with the refrigerant supplied to the suction chamber 131. [ And sucked into the cylinder bore 111.

On the other hand, since there is a friction portion in operation of the compressor and heat is generated therefrom, a certain amount of oil must always remain in the compressor for lubrication and cooling.

However, when the air conditioner is operated strongly and the compressor operates at a high rotation speed, the flow rate of the refrigerant in the compressor is increased. Therefore, most of the oil is discharged out of the compressor together with the refrigerant.

If the oil in the compressor is depleted, normal operation and lubrication of the compressor are not achieved and the service life of the compressor is greatly shortened.

Also, there is a problem that the efficiency of the air conditioner system is reduced due to the circulation of the air conditioner system in the state where the oil that has escaped from the compressor is mixed with the refrigerant. (The efficiency is better when the pure refrigerant circulates.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a compressor in which even when the compressor operates at a high speed, oil separated from the refrigerant can remain in the compressor, And it is an object of the present invention to provide an oil separator of a variable swash plate type compressor capable of improving the efficiency of the air conditioning system by reducing the amount of oil mixed in the refrigerant circulating in the air conditioning system.

According to an aspect of the present invention, there is provided an oil separator including a refrigerant passage formed in a rotary shaft inserted in a center bore of a cylinder block, an oil separator mounted on a rear end of the rotary shaft and integrally rotated, A plurality of branch conduits into which the separated and discharged oil flows, and an oil reservoir connected to the branch conduits.

A reservoir chamber in which an oil separator is installed is formed behind the center bore of the cylinder block and the branch conduits are radially formed from the circumferential surface of the chamber to the inside of the cylinder block.

The oil reservoir may be formed at equal intervals around the housing chamber.

The oil reservoir is formed in a radially inner portion of the cylinder block between two adjacent cylinder bores.

And the oil reservoir is formed to be bent from the branch pipe and parallel to the accommodation chamber.

At least one of the oil reservoirs is connected to an air supply passage connecting the discharge chamber on the inner side of the rear head and the crank chamber on the inner side of the front head through a connection hole.

And the remaining oil reservoirs which are not connected to the supply passage among the oil reservoirs are directly connected to the crank chamber inside the front head through the connection passage.

An oil discharge hole is formed on the circumferential surface of the oil separator, and the branch pipe is formed at the same position as the oil discharge hole on the inner peripheral surface of the housing chamber.

A refrigerant discharge hole is formed in one side wall of the oil separator and a through hole is formed at a position corresponding to the refrigerant discharge hole in the valve assembly so that the containing chamber communicates with the suction chamber inside the rear head.

According to the present invention as described above, a plurality of branch conduits are formed in the cylinder block, which are connected to the containing chamber provided with the oil separator, and the oil storage portion is formed in each branch conduit, . &Lt; / RTI >

Since the oil storage part receives little influence from the refrigerant flow inside the compressor, even when the compressor operates at a high speed, the oil contained in the oil storage part is mixed with the refrigerant and discharged to the compressor is reduced.

Therefore, since the remaining amount of oil in the compressor is increased, the lubricating and cooling of the driving portion is normally performed, so that it is possible to prevent a reduction in the service life of the compressor due to oil shortage.

The purity of the refrigerant circulating in the air conditioner system is improved and the efficiency of the air conditioner system is improved.

1 is a block diagram of a general variable swash plate type compressor.
2 is a configuration diagram of an oil separation apparatus according to the prior art.
3 is a configuration diagram of an oil separation apparatus according to the present invention.
4 is a sectional view taken along the line II in Fig.
5 is a diagram showing the oil distribution in the oil separator according to the present invention.
FIG. 6 is a graph showing the amount of oil discharged to the outside of the compressor according to the rotating speed of the rotating shaft of the compressor when the conventional oil separator and the oil separator according to the present invention are operated.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. The thicknesses of the lines and the sizes of the components shown in the accompanying drawings may be exaggerated for clarity and convenience of explanation.

In addition, the terms described below are defined in consideration of the functions of the present invention, and these may vary depending on the intention of the user, the operator, or the precedent. Therefore, definitions of these terms should be made based on the contents throughout this specification.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

3 is a configuration diagram of an oil separator of a variable swash plate compressor according to the present invention, and Fig. 4 is a sectional view taken along line I-I of Fig.

A center bore 31 is formed at the center of the cylinder block 30 and a plurality of cylinder bores 32 are formed radially around the center bore 31.

The rotary shaft 10 inserted into the center bore 31 is supported by the needle bearing 15 and the refrigerant passage 11 is formed axially in the inner center of the rotary shaft 10.

In the cylinder block 30, a receiving chamber 40, which is a cylindrical space, is formed at the rear of the center bore 31. The rear end of the rotary shaft 10 protrudes into the storage chamber 40 and a cylindrical oil separator 20 is provided at the end thereof. The oil separator 20 is rotated integrally with the rotary shaft 10 when the rotary shaft 10 is rotated.

The refrigerant passage 11 of the rotary shaft 10 communicates with a crank chamber having one end formed between the cylinder block 30 and the front head and the other end opened to the inside of the oil separator 20.

An oil discharge hole 21 is formed in the circumferential wall of the oil separator 20 and a refrigerant discharge hole 22 is formed in the end wall facing the rear end of the rotary shaft 10.

A through hole 61 is formed at a position opposite to the refrigerant discharge hole 22 of the oil separator 20 in the valve assembly 60 provided between the cylinder block 30 and the rear head, And the suction chamber inside the rear head communicates.

The cylinder block (30) is provided with an air supply passage (70) for connecting the discharge chamber inside the rear head to the crank chamber inside the front head. Although not shown, the supply passage 70 is connected to a control valve installed in the rear head, and the pressure of the crank chamber is controlled by the control valve so that the inclination angle of the swash plate can be adjusted.

A plurality of oil reservoirs 51 are formed in the cylinder block 30.

The oil storage portions 51 are formed at regular intervals, that is, at equal intervals along the circumference of the storage chamber 40, and are formed parallel to the rotation axis 10 and the storage chamber 40. The oil storage portion 51 may be formed at equal intervals around the entire circumference of the accommodation chamber 40 and the oil storage portion 51 may not be formed at any portion of the circumference portion of the accommodation chamber 40 (See Fig. 4)

The oil reservoir 51 is preferably formed in a cylindrical shape having a small diameter and formed in a clearance portion radially inwardly between the cylinder bore 32 and the cylinder bore 32 as shown in Fig.

A branch pipe line 50 connected to the oil reservoir 51 is formed on the inner circumferential surface of the storage chamber 40 in the same line as the oil discharge hole 21 of the oil separator 20. That is, a plurality of branch pipe passages 50 are formed radially outward from the circumferential surface of the housing chamber 40, and the oil storing portion 51 is bent in a direction perpendicular to the ends of the branch pipe passages 50 Respectively.

The end of the oil reservoir 51 (the portion opposite to the portion connected to the branch pipe passage 50) is connected to the supply passage 70 through the connection hole 52. Therefore, the oil storage portion 51 is connected to the crank chamber of the front head through the connection hole 52 and the air supply passage 70.

A connection passage 53 directly connected to the crank chamber may be formed at an end of the branch pipe passage 50 in a portion where it is difficult to form the connection hole 52 connected to the supply passage 70 structurally.

The operation of the present invention and its effect will now be described.

The refrigerant flowing into the refrigerant passage 11 of the rotary shaft 10 is discharged to the oil separator 20. At this time, since both the rotary shaft 10 and the oil separator 20 are rotated, The oil moves toward the inner circumferential surface of the oil separator 20 and accumulates on the surface of the oil separator 20. When the accumulation amount increases, the oil is discharged to the storage chamber 40 through the oil discharge hole 21 formed in the circumferential wall of the oil separator 20.

When the amount discharged to the storage chamber 40 increases, the oil flows into the branch pipe line 50 and flows into the oil storage unit 51 from the branch pipe line 50 and is stored. The oil storage portion 51 always has a predetermined amount of oil or more.

The oil discharge hole 21 of the oil separator 20 and the branch pipe passage 50 are formed in the same line and the clearance between the oil separator 20 and the inner peripheral surface of the containing chamber 40 is narrow, The oil discharged from the branch pipe line 50 may be directly introduced into the branch pipe line 50.

The oil in the oil reservoir 51 flows into the air supply passage 70 through the connection hole 52 and is supplied from the discharge chamber of the rear head to the crank chamber of the front head by the flow of the refrigerant flowing through the air supply passage 70 After the movement, it is re-supplied to the portion requiring lubrication.

The oil in the oil reservoir 51 can be discharged to the crank chamber through the connecting passage 53 directly connected to the crank chamber.

The refrigerant separated from the oil in the oil separator 20 is discharged to the refrigerant discharge hole 22 and then discharged to the suction chamber of the rear head through the through hole 61 of the valve assembly 60, And is sucked into the cylinder bore 32 again.

As described above, the refrigerant in the oil mixed state is centrifugally separated into refrigerant and oil in the oil separator 20. The oil separated from the refrigerant is introduced into the plurality of branch tubes 50 and then connected to the branch tube 50 And flows into the oil storage portion 51 and is stored.

The oil storage portion 51 is a portion where the space is expanded in the oil movement path, and the oil is attached to the inner surface of the oil storage portion 51 to maintain the storage state. Thereafter, when the amount of oil in the oil reservoir 51 increases, the oil passes through the connection hole 52 and the air supply passage 70 or through the connection passage 53 to the crank chamber of the front head.

As described above, since the plurality of branch conduits 50 and the oil storage portion 51 are present in the oil movement path, the amount of oil present in the compressor increases.

The oil storage portion 51 is formed at a position that is not influenced by the refrigerant flowing through the air supply passage 70 so that the degree of mixing of the oil in the oil storage portion 51 into the flow of the refrigerant flowing through the air supply passage 70 is reduced Even when the compressor is operated at a high speed, the amount of oil contained in the refrigerant and discharged to the outside of the compressor is reduced. That is, the amount of the oil mixed into the refrigerant flow through the connection hole 52 is smaller than the amount of the oil mixed into the refrigerant flow through the conventional connection passage 115.

Particularly, in the case of the oil reservoir 51 in which the connecting passage 53 directly connected to the crank chamber is formed, the amount of oil discharged to the outside of the compressor is further reduced because it is not affected by the refrigerant flowing through the air supply passage 70 at all. The oil separated from the refrigerant flows into the supply passage 114 through the connection passage 115 connected to the accommodation chamber 113 so that the oil can be mixed with the refrigerant flowing through the supply passage 114 more easily If the amount of oil mixed into the refrigerant increases, the amount of oil contained in the refrigerant discharged from the compressor naturally increases.)

FIG. 5 shows a state where oil is distributed on the oil movement path of the oil separator according to the present invention, and the closer to red the oil is, the more oil is present. Since the yellow and red portions are widely displayed in the oil storage portion 51, it can be seen that a large amount of oil exists in the oil storage portion 51 as compared with other portions.

6 shows the amount of oil discharged from the compressor according to the rotational speed of the compressor rotating shaft 10 in each of the prior art and the present invention. The line 1 indicates the oil discharge amount of the compressor to which the conventional oil separating apparatus is applied, The line (2) shows the oil discharge amount of the compressor to which the oil separator according to the present invention is applied. The oil discharge amount (point B) of the present invention is remarkably higher than the oil discharge amount (point A) of the prior art in the high speed operation region where the oil discharge amount is similar in the low speed operation region and the medium speed operation region, (Reduced from A to B).

Reduction in oil discharge means that much oil remains in the compressor even during high-speed operation, so that the lubricating and cooling of the friction portion is performed by the residual oil in the compressor. Therefore, during the high-speed operation of the compressor, almost all of the oil is discharged to the outside of the compressor, thereby preventing the lubrication and cooling from being performed, thereby extending the service life of the compressor.

As described above, since the amount of oil present in the compressor increases and the amount of oil mixed in the refrigerant discharged from the compressor decreases, the purity of the refrigerant circulating in the air conditioning system increases, thereby improving the efficiency of the air conditioning system.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is understandable. Accordingly, the true scope of the present invention should be determined by the following claims.

10: rotating shaft 11: refrigerant passage
15: Bearing 20: Oil separator
21: Oil discharge hole 22: Refrigerant discharge hole
30: Cylinder block 31: Center bore
32: Cylinder bore 40: Storage room
50: branch pipe line 51: oil reservoir
52: connection hole 53: connection passage
60: valve assembly 61: through hole
70: Supply passage

Claims

A refrigerant passage (11) formed in the rotary shaft (10) inserted in the center bore (31) of the cylinder block (30);
An oil separator 20 mounted on a rear end of the rotary shaft 10 and integrally rotated;
A plurality of branch pipe passages (50) through which oil separated and discharged from the refrigerant in the oil separator (20) flows;
An oil storage unit 51 connected to the branch pipe path 50;
And an oil separator for separating the oil from the compressor.

The method according to claim 1,
A housing chamber 40 in which the oil separator 20 is installed is formed behind the center bore 31 of the cylinder block 30 and the inside of the cylinder block 30 from the circumferential surface of the housing chamber 40 Wherein the branch pipes (50) are radially formed.

The method of claim 2,
Wherein the oil reservoir (51) is formed at equal intervals around the housing chamber (40).

The method of claim 2,
Wherein the oil reservoir (51) is formed in a radially inner portion of the cylinder block (30) between two adjacent cylinder bores (32).

The method of claim 2,
Wherein the oil storage portion (51) is bent from the branch pipe (50) and formed parallel to the housing chamber (40).

6. The method according to any one of claims 2 to 5,
Wherein at least one of the oil reservoirs (51) is connected to an air supply passage (70) connecting the discharge chamber on the inner side of the rear head and the crank chamber on the inner side of the front head via a connection hole (52) An oil separator for a compressor.

The method of claim 6,
The remaining oil storage portions 51 of the oil storage portions 51 which are not connected to the air supply passage 70 are directly connected to the crank chamber inside the front head through the connection passage 53. [ .

The method of claim 2,
An oil discharge hole 21 is formed on the circumferential surface of the oil separator 20 and the branch pipe passage 50 is formed on the inner circumferential surface of the containing chamber 40 at a position aligned with the oil discharge hole 21 Wherein the oil separator is a compressor.

The method of claim 2,
A refrigerant discharge hole 22 is formed in one side wall of the oil separator 20 and a through hole 61 is formed in the valve assembly 60 at a position corresponding to the refrigerant discharge hole 22, 40) communicates with a suction chamber in the rear head.