KR101099117B1 - Check valve and compressor having the same - Google Patents

Abstract

The check valve of the present invention comprises: a hollow body having an inlet through which an oil-mixed refrigerant flows in, an outlet and a drain hole formed therein, and a communication path connecting the inlet and the outlet; A valve body moving inside the main body and controlling a flow of the refrigerant from the inlet to the outlet; A cap covering an open portion of the main body; And pressurizing means for pressurizing the valve body in a direction of blocking the flow of the refrigerant, wherein the refrigerant separated from the communication path pressurizes the valve body to allow the refrigerant to flow from the inlet to the outlet. do.

Accordingly, the oil is naturally separated and discharged by the coolant inlet and the tuck to maximize oil separation performance, and at the same time, prevent the backflow of the coolant by the valve body.

In addition, the oil separation function and the check valve function to prevent the back flow of the refrigerant is integrally formed to facilitate securing the internal space of the compressor, thereby improving design and assembly.

Compressor, oil separator, check valve

Description

CHECK VALVE AND COMPRESSOR HAVING THE SAME

The present invention relates to a check valve and a compressor having the same, and more particularly, to a check valve and a compressor having the same, which maximize the oil separation performance by naturally separating and discharging the oil contained in the refrigerant. It is about.

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 discharged into the discharge chamber. The inclination angle of the swash plate is changed according to the pressure difference in the crank chamber and the pressure in the suction chamber, and the discharge amount of the refrigerant is 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.

An oil separator for separating the refrigerant and the oil is provided.

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.

However, according to the conventional swash plate type compressor, the oil separator separating the refrigerant and the oil and the check valve preventing the backflow of the refrigerant are separately provided, so that a separate space is required for the design and assembly. .

As a result, the structure in which the oil separator and the check valve are integrally formed is not disclosed.

The present invention has been made to solve the above-mentioned conventional problems, an object of the present invention is to naturally separate the discharge of the oil contained in the refrigerant to maximize the oil separation performance and at the same time to prevent the back flow of the refrigerant and this It is to provide a compressor provided.

The check valve of the present invention for achieving the above object, the hollow body having an inlet through which the oil-mixed refrigerant is introduced, the outlet and the drain hole is formed and a communication path connecting the inlet and the outlet; A valve body moving inside the main body and controlling a flow of the refrigerant from the inlet to the outlet; A cap covering an open portion of the main body; And pressurizing means for pressurizing the valve body in a direction of blocking the flow of the refrigerant, wherein the refrigerant separated from the communication path pressurizes the valve body to allow the refrigerant to flow from the inlet to the outlet. do.

In addition, it is preferable that the communication path is hollow and the hollow cross-sectional area is changed stepwise or continuously.

In addition, it is preferable that the cross-sectional area of the communication path hollow decreases in the flow direction of the refrigerant step by step.

On the other hand, the drain hole is preferably formed through the inner peripheral surface of the communication path.

In addition, the valve body is formed of a large diameter portion and a small diameter portion, it is preferable that the refrigerant groove is formed in the small diameter portion.

The coolant groove may be formed by cutting a portion of the outer circumferential surface of the small diameter part.

On the other hand, when the refrigerant separated from the oil in the communication passage pressurizes the valve body, it is preferable that the valve body is moved so that the refrigerant groove communicates the communication path and the outlet.

In addition, the valve body is formed of a large diameter portion and a small diameter portion, it is preferable that the oil groove is formed in the small diameter portion.

And, it is preferably formed to be inclined toward the inner center direction of the oil groove.

Compressor of the present invention, the discharge chamber and the suction chamber is formed; A check valve as described above installed in the discharge chamber and separating oil contained in the refrigerant; And a drain flow path formed in the housing to guide the oil separated from the check valve to the crank chamber, wherein the coolant in the discharge chamber flows in a tangential direction (check valve side) in the inner circumferential surface of the check valve. .

In addition, the O-ring is preferably provided on the outer circumferential surface of the check valve body.

According to the check valve and the compressor having the same according to the present invention, by releasing the oil contained in the refrigerant naturally by the refrigerant inlet and the jaw to maximize the oil separation performance and at the same time has the effect of preventing the back flow of the refrigerant by the valve body have.

In addition, the oil separation function and the check valve function to prevent the back flow of the refrigerant is integrally formed to facilitate securing the internal space of the compressor, thereby improving design and assembly.

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

Figure 1 is a longitudinal sectional view showing the structure of a swash plate compressor according to the present invention, Figure 2 is a side view showing the rear housing of Figure 1, Figure 3 is a cross-sectional view 'a-a' of Figure 2, Figure 4 Is a perspective view showing an exploded view of the check valve according to the present invention.

First, to describe the structure of the swash plate compressor according to the present invention.

1 to 2, the swash plate type compressor C includes a cylinder block 10 having a plurality of cylinder bores 12 formed in 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 in 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 installed 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 a central portion thereof are formed to protrude integrally on one surface, and a pin is formed on one surface of the swash plate 50. As the lug plate 54 rotates, the pin 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. A suction port 32 and a discharge port 36 are respectively formed in a position corresponding to (12).

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 suction chamber ( The inclination angle of the swash plate 50 is changed according to the pressure difference in the 22 to adjust the discharge amount of the refrigerant.

Specifically, the swash plate compressor (C) of the present invention adopts an electromagnetic solenoid type capacity control valve 100 to adjust the pressure of the crank chamber 86 by opening and closing the valve by energization, thereby adjusting the pressure of the crank chamber 86. By adjusting the angle of inclination to adjust the discharge capacity, it is possible to apply to all of these characteristics of the compressor.

In addition, the discharge chamber 24 is provided with a check valve 200 that separates oil from the discharged refrigerant and prevents backflow of the discharged refrigerant.

Here, the check valve 200 serves to prevent the compressor from falling in efficiency by separating oil from the refrigerant passing through the discharge chamber 24 so that only the gas refrigerant is directed to the condenser (not shown). Will be described later.

On the other hand, the oil separated by the check valve 200 is re-introduced into the crank chamber 86 through the drain passage 19 formed in the rear housing 18 to maintain excellent lubrication performance.

Hereinafter, the check valve 200 of the present invention will be described with reference to the drawings.

3 to 4, the check valve 200 according to the present invention includes a hollow main body 210 having an inlet 215 and an outlet 211 formed therein, and an inside of the main body 210. A valve body 220 which moves and controls the flow of the refrigerant from the inlet 215 to the outlet 211, a cap 230 and the valve body 220 which cover the open end of the main body 210. It consists of a pressurizing means 240 for pressurizing in a direction to block the flow of the refrigerant.

In addition, a communication path 212 connecting the inlet 215 and the outlet 211 is formed in the main body 210, and a drain hole 213 is formed in the communication path 212.

Here, the communication path 212 is a hollow shape, the cross-sectional area of the communication path 212 is formed to change stepwise or continuously, or the cross-sectional area of the communication path 212 is formed so as to decrease step by step in the flow direction of the refrigerant Can be.

On the other hand, the drain hole 213 is formed through the inner peripheral surface of the communication path 212, the drain hole 213 is in communication with the above-described drain flow path (19).

The outlet 211 is formed along the outer circumferential surface of the main body 210.

On the other hand, the refrigerant containing oil flows in the tangential direction (check valve side) of the inner circumferential surface of the communication path 212 through the inlet 215 as shown in Figures 2 to 3 and rotates along the inner circumferential surface of the communication path 212. As a result, the refrigerant including the oil enters the inlet 215 and at the same time a collision occurs and oil is firstly separated, and then the refrigerant from which the oil is firstly separated is rotated along the inner circumferential surface of the communication path 212 so that the oil has 2 Separated by car.

In addition, the jaw portion 214 is formed while the cross-sectional area is reduced in the direction of the valve body 220 of the communication path 212, so that the refrigerant having secondary oil separated by rotating the inner circumferential surface of the inlet 215 is the jaw portion 214. ), The oil is separated in 3rd order. Thereafter, the refrigerant rotates again in the communication path 212 having a reduced cross-sectional area, and finally oil is separated.

That is, the oil contained in the refrigerant is separated several times and sent to the crank chamber 86 through the drain hole 213 and the drain flow path 19.

In addition, the valve body 220 is formed of a large diameter portion 220a and a small diameter portion 220b, an oil groove 221 is formed in the small diameter portion 220b, and the oil groove 221 is the inlet ( The oil not separated at 215 and at the jaw 214 is once again separated from the refrigerant.

On the other hand, the inner end of the oil groove 221 is formed to be inclined in the center direction.

In addition, the small diameter portion 220b is formed with a coolant groove 222 having a portion of an outer circumferential surface thereof cut out, and the coolant groove 222 discharges the refrigerant from which oil is separated through the discharge port 211.

That is, when the refrigerant in which the oil is separated from the communication path 212 pressurizes the valve body 220, the valve body 220 moves so that the refrigerant groove 222 is connected to the communication path 212 and the discharge port ( 211).

Specifically, the refrigerant from which the oil is separated exerts a discharge pressure on the small diameter portion 220b of the valve body 220, and the valve body 220 moves while compressing the elastic means 240 by the discharge pressure, thereby discharging the outlet 211. By opening C), a flow path is formed so that the coolant flows through the coolant groove 222 and the discharge port 211, thereby discharging the coolant.

In addition, when the refrigerant is discharged by the opening of the valve body 220, the discharge pressure of the refrigerant decreases momentarily, and the valve body 220 moves in the direction of closing by the elastic force of the elastic means 240, and the discharge port 211 is discharged. By closing the to prevent the reverse flow of the discharged refrigerant.

On the other hand, at least one O-ring (not shown) is preferably installed on the outer circumferential surface of the main body 210.

Therefore, the above-described check valve 200 may perform both the role of separating the oil from the refrigerant and at the same time, the role of the check valve that also prevents the reverse flow of the discharged refrigerant.

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 is applied to the swash plate compressor, but the present invention is not limited thereto, and the present invention may be applied to both a scroll compressor and a rotary compressor, including a general anchoring compressor.

In addition, it should be noted that the check valve of the present invention is applicable to any device capable of separating gas and liquid.

1 is a longitudinal sectional view showing the structure of a swash plate compressor according to the present invention.

FIG. 2 is a side view illustrating the rear housing of FIG. 1. FIG.

3 is a sectional view taken along the line 'a-a' of FIG. 2.

Figure 4 is an exploded perspective view of the check valve according to the present invention.

* Description of symbols on main parts of the drawings *

C-swash plate compressor 100-displacement control valve

200-check valve

Claims (11)

A hollow body having an inlet through which oil-cooled refrigerant is introduced, an outlet and a drain hole, and a communication path connecting the inlet and the outlet; A valve body moving inside the main body and controlling a flow of the refrigerant from the inlet to the outlet; A cap covering an open portion of the main body; And It includes pressurizing means for pressurizing the valve body in a direction to block the flow of the refrigerant, The refrigerant separated from the oil in the communication path pressurizes the valve body so that the refrigerant flows from the inlet to the outlet, The valve body is formed of a large diameter portion and a small diameter portion, the check valve, characterized in that the refrigerant groove is formed in the small diameter portion. The method of claim 1, The communication passage has a hollow shape, characterized in that the cross-sectional area of the hollow changes stepwise or continuously. 3. The method of claim 2, And the cross-sectional area of the communication passage hollow decreases in the direction of flow of the refrigerant in stages. The method of claim 1, And the drain hole is formed through the inner circumferential surface of the communication path. delete The method of claim 1, The coolant groove is formed by cutting a portion of the outer peripheral surface of the small diameter portion. The method of claim 1, And the valve body moves when the refrigerant separated from the oil in the communication path pressurizes the valve body so that the refrigerant groove communicates the communication path with the outlet. A hollow body having an inlet through which oil-cooled refrigerant is introduced, an outlet and a drain hole, and a communication path connecting the inlet and the outlet; A valve body moving inside the main body and controlling a flow of the refrigerant from the inlet to the outlet; A cap covering an open portion of the main body; And It includes pressurizing means for pressurizing the valve body in a direction to block the flow of the refrigerant, The refrigerant separated from the oil in the communication path pressurizes the valve body so that the refrigerant flows from the inlet to the outlet, The valve body is formed of a large diameter portion and a small diameter portion, the check valve, characterized in that the oil groove is formed in the small diameter portion. The method of claim 8, Check valve, characterized in that formed inclined toward the inner center direction of the oil groove. A housing in which a discharge chamber and a suction chamber are formed; Claim 1, 2, 3, 4, 6, 7, 9, 8, and 9 provided in the discharge chamber and separating oil contained in the refrigerant. The check valve described; And A drain flow path formed in the housing to guide oil separated from the check valve to the crank chamber, And the refrigerant in the discharge chamber flows in a tangential direction (check valve side) in the inner circumferential surface of the inlet of the check valve. The method of claim 10, Compressor characterized in that the O-ring is installed on the outer peripheral surface of the check valve body.

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