KR101175269B1

KR101175269B1 - Check valve of compressor

Info

Publication number: KR101175269B1
Application number: KR1020100109143A
Authority: KR
Inventors: 이건호; 김기범; 김성용
Original assignee: 주식회사 두원전자; 학교법인 두원학원
Priority date: 2010-11-04
Filing date: 2010-11-04
Publication date: 2012-08-21
Also published as: KR20120047529A

Abstract

The check valve of the compressor of the present invention, the valve inlet 111 is formed with a valve cap 110; A valve housing (120) in which a refrigerant discharge passage (121) communicating with the refrigerant inlet (111) is formed; A valve body 130 moving between the valve cap 110 and the valve housing 1200 to control the flow of the refrigerant in the refrigerant inlet 111 and the refrigerant discharge passage 121; and the valve body and the valve housing Including a biasing means 140 interposed between the 120, the refrigerant inlet 111 and the refrigerant discharge passage 121 is characterized in that to form a straight flow path.
Accordingly, the coolant inlet port and the coolant outlet port are arranged in the same line (straight line flow path) to prevent pressure loss, vibration, and noise caused by a sudden flow path change of the coolant passing through the check valve.

Description

CHECK VALVE OF COMPRESSOR

The present invention relates to a check valve of a compressor, and more particularly to a check valve of the compressor to prevent the pressure loss and vibration and noise caused by the rapid flow path change of the refrigerant passing through the check valve.

Since the compressor included in the cooling system of the automotive air conditioner is directly connected to the engine through the belt, the rotation speed cannot be controlled.

Therefore, in recent years, a variable capacity compressor that can change the discharge amount of the refrigerant to obtain a cooling capacity without being regulated by the rotational speed of the engine has been used a lot.

Various types of variable displacement compressors are disclosed, such as swash plate type, rotary type and scroll type.

In the swash plate type compressor, the swash plate provided so that the inclination angle is variable in the crank chamber rotates according to the rotational motion of the rotating shaft, and the piston reciprocates by the rotational motion of the swash plate. In this case, the refrigerant in the suction chamber is sucked into the cylinder by the reciprocating motion of the piston, compressed, and then discharged into the discharge chamber. Will be controlled.

In particular, it is common to adopt the solenoid type capacity control valve to adjust the pressure of the crankcase by opening and closing the valve by energization, and thereby adjusting the discharge capacity by adjusting the inclination angle of the swash plate.

At this time, the operation of the capacity control valve is calculated by a control unit in which a signal such as the detected engine speed, the temperature inside or outside the vehicle, the evaporator temperature, or the like is incorporated by the CPU, and based on the result of the calculation, the current By sending it to an electromagnetic coil.

In addition, a check valve is provided at the discharge port communicating with the discharge chamber to prevent the backflow of the refrigerant during the minimum capacity operation of the compressor.

Hereinafter, a structure of a check valve according to the related art will be described with reference to the drawings.

1 is a longitudinal sectional view showing a check valve of a variable displacement compressor according to the prior art.

As shown in FIG. 1, the check valve 1 according to the related art includes a valve housing 2 in which a refrigerant inlet 2a through which discharged refrigerant is introduced and a refrigerant outlet 2b through which discharged refrigerant is discharged are respectively formed. And a valve body 3 for reciprocating the inside of the valve housing 2 to open and close the refrigerant inlet 2a and the refrigerant outlet 2b, and a cover 4 covering the open end of the valve housing 2. And a spring 5 interposed between the cover 4 and the valve body 3.

The check valve 1 configured as described above is installed at the discharge port of the compressor to prevent the reverse flow of the refrigerant during the minimum capacity operation (at low pressure discharge).

However, according to the conventional check valve (1) through the refrigerant inlet (2a) and the refrigerant discharge port (2b), the direction of the flow path (movement) of the refrigerant is rapidly changed to generate pressure loss and vibration and noise.

That is, the flow path (movement) direction of the coolant is converted from the vertical direction to the horizontal direction with respect to the pressure receiving surface of the valve body 3 to generate a pressure loss and a flow loss of the discharged refrigerant, thereby reducing the compression efficiency of the compressor.

In addition, the valve body 3 opens the refrigerant inlet port 2a and the refrigerant outlet port 2b by the discharge pressure Pd (FIG. 1A), and as a result, the discharge pressure Pd drops and springs are generated. Due to the elastic force of (5), the valve body 3 is moved in the direction of closing, so that the opposing surfaces of the valve body 3 and the valve housing 2 collide with each other, causing a hitting sound.

The present invention has been made to solve the above-mentioned conventional problems, an object of the present invention is a check valve of the compressor to prevent the pressure loss and vibration and noise caused by the sudden flow path change of the refrigerant passing through the check valve To provide.

In addition, another object of the present invention is to provide a check valve of a compressor that does not generate a hitting sound even when the opening and closing of the valve is repeated by the differential pressure of the discharge pressure.

The check valve of the compressor of the present invention for achieving the above object, the valve cap 110, the refrigerant inlet 111 is formed; A valve housing (120) in which a refrigerant discharge passage (121) communicating with the refrigerant inlet (111) is formed; A valve body 130 moving between the valve cap 110 and the valve housing 1200 to control the flow of the refrigerant in the refrigerant inlet 111 and the refrigerant discharge passage 121; and the valve body and the valve housing It includes a access stage 140 interposed between the 120, the refrigerant inlet 111 and the refrigerant discharge passage 121 is characterized in that to form a straight flow path.

In addition, inclined surfaces 112 and 122 are formed on the inner circumferential surface of the valve cap 110 and the outer circumferential surface of the valve housing 120 facing the inner circumferential surface of the valve cap 110, respectively, and the valve cap 110 and the valve housing ( It is preferable that the valve body 130 is installed between the inclined surfaces 112 and 122 of the 120 to incline.

In addition, the valve body 130 is preferably formed to be divided into a pair based on the refrigerant inlet 111.

On the other hand, the valve body 130 is preferably formed to be divided into a pair based on the center of the refrigerant inlet 111.

In addition, the surface where the divided valve body 130 abuts is preferably flat.

In addition, the valve housing 120 is preferably formed with a receiving portion 123 into which the biasing means 140 is inserted.

On the other hand, when viewed from the flow direction of the refrigerant, the receiving portion 123 is preferably made of a circular ring shape.

In addition, the biasing means 140 is installed extending in the flow direction of the refrigerant, the surface of the valve body 130 in contact with the biasing means 140 is preferably a plane formed perpendicular to the flow direction.

According to the check valve of the compressor according to the present invention, the coolant inlet and the coolant outlet are arranged in the same line (linear flow path) to prevent the occurrence of pressure loss and vibration and noise due to the rapid flow path change of the refrigerant passing through the check valve. .

That is, since the direction of the flow path (movement) of the refrigerant is not changed, the pressure loss and the flow loss of the discharged refrigerant are prevented, thereby improving the compression efficiency of the compressor.

In addition, as the valve body moves along the inclined surfaces respectively formed on the opposing surfaces of the valve cap and the valve housing, it is possible to prevent the impact sound from occurring even when the valve body is repeatedly opened and closed by the differential pressure of the discharge pressure.

1 is a longitudinal sectional view showing a check valve of a variable displacement compressor according to the prior art.
2 is a longitudinal sectional view showing the structure of a compressor according to the present invention.
3 is an exploded perspective view showing a check valve according to the present invention.
Figure 4 is a longitudinal sectional view showing the structure of a check valve according to the present invention.
5 is a longitudinal sectional view showing an operating state of a check valve according to the present invention.

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

Figure 2 is a longitudinal sectional view showing a structure of a compressor according to the present invention, Figure 3 is an exploded perspective view showing a check valve according to the present invention, Figure 4 is a longitudinal sectional view showing a structure of a check valve according to the present invention, 5 is a longitudinal sectional view showing an operating state of a check valve according to the present invention.

First, the structure of the swash plate type compressor installed with a check valve according to the present invention will be described schematically.

2 to 5, the swash plate type compressor C includes a cylinder block 10 having a plurality of cylinder bores 12 formed on an inner circumferential surface in parallel in a longitudinal direction, and the cylinder block 10. The front housing 16 is hermetically coupled to the front of the, and the rear housing 18 is hermetically coupled via a valve plate 20 to the rear of the cylinder block 10.

The crank chamber 86 is provided inside the front housing 16, and one end of the drive shaft 44 is rotatably supported near the center of the front housing 16, while the other end of the drive shaft 44 is Passed through the crank chamber 86 is supported via a bearing provided in the cylinder block 10.

In the crank chamber 86, the lug plate 54 and the swash plate 50 are provided around the drive shaft 44.

In the lug plate 54, a pair of power transmission support arms 62 each having a linearly perforated guide hole 64 formed at the center thereof are formed to protrude integrally on one surface, and one surface of the swash plate 50 has a ball. As the lug plate 54 rotates, the ball 66 of the swash plate 50 slides in the guide hole 64 of the lug plate 54 so that the swash plate 50 can be rotated. The inclination angle is variable.

In addition, the outer circumferential surface of the swash plate 50 is fitted to the piston 14 so as to be able to slide through the shoe 76.

Accordingly, as the swash plate 50 rotates in an inclined state, the pistons 14 fitted to the outer peripheral surface of the swash plate 50 via the shoe 76 reciprocate in the respective cylinder bores 12 of the cylinder block 10 do.

In addition, a suction chamber 22 and a discharge chamber 24 are formed in the rear housing 18, and each cylinder bore is provided in the valve plate 20 interposed between the rear housing 18 and the cylinder block 10. The intake valve 32 and the discharge valve 36 are formed in the place corresponding to (12), respectively.

By the reciprocating motion of the piston 14, the refrigerant in the suction chamber 22 is sucked into the cylinder bore 12, compressed and discharged to the discharge chamber 24, the pressure in the crank chamber 86 and the cylinder bore ( According to the pressure difference of 12), the inclination angle of the swash plate 50 is changed to adjust the discharge amount of the refrigerant, which adjusts the pressure of the crank chamber 86 by opening and closing the valve by energizing, and thereby the inclination angle of the swash plate 50. It is usually implemented by the capacity control valve 200 to adjust the discharge capacity by adjusting the.

In addition, a discharge port 25 communicating with the discharge port chamber 24 is formed in the rear housing 18. The discharge port 25 discharges the refrigerant compressed outside the set differential pressure to the outside and the discharged refrigerant flows backward. The check valve 100 is prevented from being installed.

The compressor described above is just one example in which the check valve 100 according to the present invention is installed, and is applicable to all other various types of compressors.

Hereinafter, a check valve 100 according to the present invention will be described with reference to the drawings.

As shown, the check valve 100 according to the present invention, by repeatedly performing the action of sending the refrigerant discharged from the discharge chamber 24 to the next cooling cycle, largely the valve cap 110 and the valve cap An elastic force is applied to the valve housing 120 installed to close the open end of the 110, the valve body 130 installed between the valve cap 110 and the valve housing 120, and the valve body 130. The addition is constituted by the biasing means 140.

First, the refrigerant inlet 111 is formed at the center of one side of the valve cap 110, and the valve housing 120 is opened to be installed at the other side.

In addition, the valve housing 120 has a refrigerant discharge passage 121 in communication with the refrigerant inlet 111 is formed through the longitudinal direction of the valve housing 120.

The valve body 130 moves between the valve cap 110 and the valve housing 120 to control the refrigerant flow of the refrigerant inlet 111 and the refrigerant discharge passage 121. Specifically, the valve body 130 opens or closes the refrigerant inlet 121 by the pressure of the discharged refrigerant.

On the other hand, the refrigerant inlet 111 and the refrigerant discharge passage 121 is formed on the same line to form a straight passage. That is, when the valve body 130 is opened, the refrigerant inlet 111 and the refrigerant discharge passage 121, which form a straight flow path, prevent a sudden change in the flow path of the refrigerant passing through the check valve 100 of the present invention. It suppresses generation of loss, vibration and noise.

In addition, inclined surfaces 112 and 122 are formed on the inner circumferential surface of the valve cap 110 and the outer circumferential surface of the valve housing 120 facing the inner circumferential surface of the valve cap 110, respectively, and the valve cap 110 and the valve housing ( The valve body 130 is installed between the inclined surfaces 112 and 122 of the 120 to incline.

In this case, as the valve body 130 inclines along the inclined surfaces 112 and 122 formed on the opposite surfaces of the valve cap 110 and the valve housing 120, Even when the opening and closing is repeated, the hitting of the valve body 130 and the valve cap 110 may be prevented from occurring.

In addition, the valve body 130 is formed to be divided into a pair based on the refrigerant inlet 111. That is, as shown in FIG. 5, the pair of valve bodies 130 are tilted in opposite directions to control the flow of the refrigerant in the refrigerant inlet 111 and the refrigerant discharge passage 121.

In addition, the valve body 130 may be formed to be divided into a pair based on the center of the refrigerant inlet 111.

In addition, the valve housing 120 is formed with a receiving portion 123 into which the biasing means 140 is inserted.

Specifically, the receiving portion 123 is formed in a circular ring shape when viewed from the flow direction of the refrigerant.

That is, one end of the biasing means 140 pressurizes the valve body 130 and the other end is fitted into the valve housing 120 accommodating part 123.

This, the biasing means 140 may adjust the pressure difference between the opening and closing the valve body 130 according to the size of the elastic modulus.

As mentioned above, although preferred embodiment of this invention was described in detail, the technical scope of this invention is not limited to the above-mentioned embodiment, It should be interpreted by the claim. It will be understood by those skilled in the art that many modifications and variations are possible without departing from the scope of the present invention.

For example, in the above description, the check valve of the present invention has been described as being installed on the discharge side of the compressor, but the present invention is not particularly limited, and the same may be applied to the suction side of the compressor.

100-check valve 110-valve cap
120-valve housing 130-valve body
140-taxable means

Claims

A valve cap 110 in which a coolant inlet 111 is formed;
A valve housing (120) in which a refrigerant discharge passage (121) communicating with the refrigerant inlet (111) is formed;
A valve body 130 moving between the valve cap 110 and the valve housing 1200 and controlling the flow of the refrigerant in the refrigerant inlet 111 and the refrigerant discharge passage 121; and
It includes a biasing means 140 which is interposed between the valve body 130 and the valve housing 120,
The refrigerant inlet 111 and the refrigerant discharge passage 121 is a check valve of the compressor, characterized in that to form a straight flow path.

The method of claim 1,
Inclined surfaces 112 and 122 are formed on the outer circumferential surface of the valve housing 120 facing the inner circumferential surface of the valve cap 110 and the inner circumferential surface of the valve cap 110, respectively, and the valve cap 110 and the valve housing 120 are formed. The check valve of the compressor, characterized in that the valve body 130 is installed between the inclined surfaces (112, 122) of the inclined movement.

The method of claim 2,
The valve body 130,
The check valve of the compressor, characterized in that it is formed to be divided into a pair based on the refrigerant inlet (111).

The method of claim 3,
The valve body 130,
The check valve of the compressor, characterized in that formed to be divided into a pair based on the center of the refrigerant inlet (111).

The method of claim 4, wherein
The check valve of the compressor, characterized in that the contact surface of the divided valve body 130 is flat.

The method according to any one of claims 1 to 5,
The valve housing 120 is a check valve of the compressor, characterized in that the receiving portion 123 is inserted into the biasing means 140 is formed.

The method according to claim 6,
When viewed from the flow direction of the refrigerant, the receiving portion 123 is a check valve of the compressor, characterized in that formed in a circular ring shape.

The method according to claim 6,
The biasing means 140 is installed extending in the flow direction of the refrigerant, the check means of the compressor, characterized in that the surface of the valve body 130 in contact with the 140 is a plane formed perpendicular to the flow direction. valve.