KR100933264B1 - Displacement control valve of variable displacement compressor - Google Patents

Abstract

PURPOSE: A variable displacement valve of a variable displacement compressor are provided to apply an electric current by actuating pressure of a suction chamber in a traveling direction of a valve head when a solenoid runs. CONSTITUTION: A variable displacement valve(100) of a variable displacement compressor comprises a valve body, a valve head(120) and a solenoid. The valve body comprises a suction chamber connection hole(111), a crank chamber connection hole(112) and an ejection chamber connection hole(113). The suction chamber connection hole, the crank chamber connection hole and the ejection chamber connection hole are pressed by a suction chamber(22), a crank chamber(86) and an ejection chamber(24). The ejection chamber connection hole and crank chamber connection hole are communicated one another. The valve head opens and closes the ejection chamber connection hole via the crank chamber connection hole, while having a reciprocating motion through applying an electric current. The solenoid has a movable part connected to the head valve and a magnetic coil(132) arranged in a circumference of the movable part.

Description

Capacity control valve of variable displacement compressor {DISPLACEMENT CONTROL VALVE OF VARIABLE DISPLACEMENT COMPRESSOR}

The present invention relates to a capacity control valve of a variable displacement compressor, more specifically, it can be opened and closed with a small force to suppress heat generation of the electromagnetic coil and to enable lubrication of the crankcase and the piston even when the valve is closed. It relates to a capacity control valve of a variable compressor.

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 installed so that the inclination angle is variable in the crank chamber is rotated according to the rotational motion of the rotating shaft, and the piston is reciprocated 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, by adopting an electromagnetic solenoid type capacity control valve to open and close the valve by energization to adjust the pressure of the crank chamber, through this to adjust the inclination angle of the swash plate to adjust the discharge capacity.

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, or the evaporator temperature, etc. is incorporated by the CPU, and the control signal is based on the calculation result. By sending it to the electronic coil.

However, according to the conventional capacity control valve, since the valve must be operated against the high pressure formed in the discharge chamber communication path when the valve is closed, only a large current is supplied to the electromagnetic coil, and as a result, the electromagnetic coil generates a large heat and seals it. The O-ring of the dragon was damaged, causing the refrigerant to leak.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to apply a relatively small current to the electromagnetic solenoid because the pressure in the suction chamber can be used even when the valve is operated against the high pressure formed in the discharge chamber. The present invention provides a capacity control valve of a variable displacement compressor that greatly reduces the amount of heat generated in an electromagnetic coil.

It is also an object of the present invention to provide a capacity control valve of a variable displacement compressor such that oil is supplied to the crank chamber and the cylinder bore even when the valve is closed.

In order to achieve the above object, the capacity control valve of the variable displacement compressor according to the present invention,

And a swash plate which is inclined with respect to the drive shaft in the crank chamber and rotates together with the rotation of the drive shaft, and a piston which is connected to the swash plate to reciprocate to suck the refrigerant in the suction chamber into the cylinder, compress it, and discharge it into the discharge chamber. In the solenoid capacity control valve of the variable displacement compressor of the variable displacement compressor to change the discharge amount of the refrigerant by adjusting the pressure in the crank chamber to change the inclination angle of the swash plate,

A suction chamber connecting hole, a crank chamber connecting hole, and a discharge chamber connecting hole are formed inside the suction chamber, the crank chamber and the discharge chamber, respectively, and the discharge chamber connecting hole and the crank chamber connecting hole communicate with each other. Wow,

A rod-shaped valve head arranged to open and close the discharge chamber connecting hole through the crank chamber connecting hole while reciprocating by energization;

An electromagnetic solenoid having a movable portion connected to the valve head and an electromagnetic coil disposed around the movable portion,

The front end of the valve head is opposed to the discharge chamber connection hole, and the rear end is directly exposed to the suction chamber connection hole to directly receive the pressure of the suction chamber, and the area of the discharge chamber connection hole opposite the front end of the valve head is the rear end of the valve head. It is characterized by being smaller than the hydraulic pressure area of.

The valve head is disposed across the crank chamber connecting hole and the suction chamber connecting hole, characterized in that the valve head is arranged in parallel with the discharge chamber connecting hole.

The valve body is characterized in that a bypass hole for continuously communicating with the crank chamber connecting hole and the suction chamber connecting hole from the discharge chamber side.

According to the present invention having the above-described configuration, even if the valve is operated against the high pressure formed in the discharge chamber, the pressure in the suction chamber to act in the moving direction of the valve head when the electromagnetic solenoid is energized so that the relatively small compared to the prior art The advantage is that the current can be energized.

In addition, according to the present invention, it is possible to prevent damage to the surrounding structure by greatly reducing the amount of heat generated in the electronic coil.

In addition, according to the present invention, there is an advantage that the life of the compressor can be extended by allowing oil to be supplied to the crank chamber and the cylinder bore even when the valve is closed.

Hereinafter, with reference to the accompanying Figures 1 to 3 will be described in detail a preferred embodiment of the present invention.

First, the structure of the variable displacement swash plate type compressor provided with a capacity control valve according to the present invention will be described schematically.

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

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 through the shoe 76 on the outer circumferential surface thereof are reciprocated in each cylinder bore 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).

With this structure, the refrigerant in the suction chamber 22 is sucked into the cylinder bore 12 by the reciprocating motion of the piston 14, compressed and discharged to the discharge chamber 24, the crank chamber 86 The inclination angle of the swash plate 50 is changed according to the difference between the pressure in the chamber and the pressure in the suction chamber 22 to adjust the discharge amount of the refrigerant.

In the present embodiment, the solenoid type capacity control valve 100 is adopted to control the pressure of the crank chamber 86 by opening and closing the valve by energizing, thereby adjusting the inclination angle of the swash plate 50 to adjust the discharge capacity. It is.

Specifically, the capacity control valve 100 according to the present invention includes a valve body 110, a valve head 120 and the solenoid 130, the valve body 110 as the electromagnetic solenoid 130 is energized Is configured to open and close the discharge chamber connecting hole 113 formed in the valve body 110 while reciprocating.

The valve body 110 has a suction chamber connecting hole 111, a crank chamber connecting hole 112, and a discharge chamber connecting hole that receive pressure from the suction chamber 22, the crank chamber 86, and the discharge chamber 24, respectively. 113 is formed. The discharge chamber connecting hole 113 and the crank chamber connecting hole 112 have a structure in communication with each other.

In the drawing, the discharge chamber connecting hole 113 is formed in a direction orthogonal to the crank chamber connecting hole 112 and the suction chamber connecting hole 111, respectively, but the direction may be arbitrarily determined.

In addition, the valve head 120 is reciprocated by the energization of the electromagnetic solenoid 130, and is to open and close the discharge chamber connecting hole 113 through the crank chamber connecting hole 112 while reciprocating. The spring 125 is installed at the lower portion of the valve head 120, so that the valve head 120 is lowered normally in the absence of external force to maintain the discharge chamber connecting hole 113 in an open state.

The electromagnetic solenoid 130 is configured to include a movable portion 131 connected to the valve head 120 and an electromagnetic coil 132 disposed around the movable portion 131. The movable part 131 may include a rod 131a directly connected to the valve head 120 and a movable iron core 131b formed at an end of the rod 131a.

According to the exemplary embodiment of the present invention, the front end of the valve head 120 faces the discharge chamber connecting hole 113, and the rear end of the valve head 120 is exposed to the suction chamber connecting hole 111 to directly press the pressure of the suction chamber 22. It is structured to receive.

Accordingly, when the valve head 120 rises to close the discharge chamber connecting hole 113 by energization of the electromagnetic solenoid 130, the suction chamber 22 may be assisted to provide the electromagnetic solenoid 130. Since the current to be supplied to may be small, the amount of heat generated by the electronic coil 132 is greatly reduced.

Furthermore, as shown in FIG. 2, the area Ad of the discharge chamber connecting hole 113 facing the front end of the valve head 120 is the hydraulic pressure area As of the rear end of the valve head 120. It is smaller than).

Accordingly, the difference between the force due to the discharge pressure (pressure x area) and the force due to the suction pressure is reduced, thereby more effectively assisting the lifting force of the electromagnetic solenoid 130.

In addition, the valve head 120 is disposed across the crank chamber connecting hole 112 and the suction chamber connecting hole 111, and is arranged in parallel with the discharge chamber connecting hole 113. However, the direction of the valve head 120 may be arranged to be adjusted appropriately.

On the other hand, the valve body 110 is formed with a bypass hole 115 for continuously communicating with the crank chamber connecting hole 112 and the suction chamber connecting hole 111 from the discharge chamber 24 side.

The bypass hole 115 has a much smaller cross-sectional area than the discharge chamber connecting hole 113 and continuously discharges oil into the crank chamber 86 and the cylinder bore 12 using the discharge pressure of the discharge chamber 24. It serves to supply. The oil may be obtained after the refrigerant is gas-liquid separated by an oil separator installed in the discharge chamber 24.

Accordingly, even when the valve head 120 closes the discharge chamber connecting hole 113, it is possible to prevent the oil supply from being interrupted. The crank chamber 86 and the cylinder bore 12 are always lubricated, so that the movable part is smooth. It is made of movable structure.

The operation of the present invention will be described below.

First, the number of revolutions of the engine, the temperature difference between the indoor and outdoor air, the temperature of the evaporator is detected and the signal is sent to the MCU, when the increase signal of the refrigerant discharge amount is sent from the MCU to the energization amount to the electronic solenoid 130 increases.

Accordingly, the movable part 131 moves upward to overcome the resistance of the spring 125 and the discharge pressure Pd of the discharge chamber connecting hole 113 to close the discharge chamber connecting hole 113.

At this time, the suction pressure (Ps) is applied to the lower end of the valve head 120 to help increase the valve head 120.

Furthermore, the area of the discharge chamber connecting hole 113 opposite to the tip of the valve head 120 is smaller than the hydraulic pressure area of the rear end of the valve head 120, so that the valve head 120 can be raised more effectively. Will help.

As such, when the discharge chamber connecting hole 113 is closed, the pressure in the discharge chamber 24 does not act on the crank chamber 86, so the pressure in the crank chamber 86 is lowered and the swash plate is caused by the pressure in the suction chamber 22. Maintaining a large inclination angle of 50, the amount of the refrigerant discharged is increased.

In addition, since the bypass hole 115 which continuously connects the crank chamber connecting hole 112 and the suction chamber connecting hole 111 is formed from the discharge chamber 24 side, the discharge chamber connecting hole 113 is formed. Oil is supplied to the crank chamber 86 and the suction chamber 22 even in a closed state, thereby enabling smooth lubrication.

On the other hand, when the energization amount to the solenoid 130 is reduced, the valve head 120 is lowered by the discharge pressure of the discharge chamber connecting hole 113 and the elastic force of the spring 125 to discharge the discharge chamber connecting hole 113 Is opened.

In this case, since the discharge pressure acts on the crank chamber 86 through the crank chamber connecting hole 112, the pressure of the crank chamber 86 is increased. Thereby, the pressure of the crank chamber 86 exceeds the pressure of the suction chamber 22, and the swash plate 50 moves in the direction which becomes small inclination angle.

As a result, the amount of refrigerant discharged is small, so that the refrigerant is properly adapted to the external heat load.

In the above-described operation of the present invention, only the configuration in which the valve head 120 opens and closes the discharge chamber communication hole 113 is shown, but the opening degree of the discharge chamber communication hole 113 can be adjusted according to the amount of energization. Of course it can.

1 is a longitudinal sectional view showing a structure of a variable displacement compressor provided with a capacity control valve according to the present invention.

2 is a longitudinal sectional view showing a specific structure of the capacity control valve in FIG.

3 is a longitudinal cross-sectional view illustrating a modification of FIG. 2.

※ Explanation of Major Drawings

22 ... suction chamber

24 ... discharge chamber

44 ... drive shaft

50. Saphan

86 ... Crankcase

100 ... Capacity control valve

110. Valve body

120 ... valve head

130 ... electronic solenoid

C ... variable displacement compressor

Claims (3)

And a swash plate which is inclined with respect to the drive shaft in the crank chamber and rotates together with the rotation of the drive shaft, and a piston which is connected to the swash plate to reciprocate to suck the refrigerant in the suction chamber into the cylinder, compress it, and discharge it into the discharge chamber. In the solenoid capacity control valve of the variable displacement compressor of the variable displacement compressor to change the discharge amount of the refrigerant by adjusting the pressure in the crank chamber to change the inclination angle of the swash plate, A suction chamber connecting hole, a crank chamber connecting hole, and a discharge chamber connecting hole are formed inside the suction chamber, the crank chamber and the discharge chamber, respectively, and the discharge chamber connecting hole and the crank chamber connecting hole communicate with each other. Wow, A rod-shaped valve head arranged to open and close the discharge chamber connecting hole through the crank chamber connecting hole while reciprocating by energization; An electromagnetic solenoid having a movable portion connected to the valve head and an electromagnetic coil disposed around the movable portion, The front end of the valve head is opposed to the discharge chamber connection hole, and the rear end is directly exposed to the suction chamber connection hole to directly receive the pressure of the suction chamber, and the area of the discharge chamber connection hole opposite the front end of the valve head is the rear end of the valve head. A capacity control valve of a variable displacement compressor, characterized in that less than the water pressure area of the. The method of claim 1, The valve head is disposed across the crank chamber connecting hole and the suction chamber connecting hole, the valve head is disposed in parallel with the discharge chamber connecting hole capacity control valve of a variable displacement compressor. The method of claim 1, The valve body capacity control valve of the variable displacement compressor, characterized in that the bypass hole for continuous communication between the crank chamber connecting hole and the suction chamber connecting hole from the discharge chamber side.

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