KR20100040163A - Displacement control valve of variable displacement compressor - Google Patents

Abstract

PURPOSE: A capacity control valve of a variable capacity type compressor is provided to control torque applied to a compressor according to load applied to a vehicle. CONSTITUTION: A capacity control valve of the variable capacity type compressor comprises a valve housing(110), a solenoid(130), and a valve body(120). The valve body is reciprocated inside the valve housing by a solenoid. The discharge pressure of a compressor is changed according to the electromechanical power of the solenoid. A first guide hole is formed inside the valve housing to connect a crank-case connected space and an ejection case connected space. The valve body is extended to the ejection case connected space. The valve body opens and closes the inlet of the first guide hole. A bellows(160) is installed at the end of the ejection case connected space.

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, and more particularly, to a capacity control valve of a variable displacement compressor to easily adjust the load on the 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 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 to 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 Adjusted.

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, 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.

A representative example of a capacity control valve of such a variable displacement compressor is disclosed in US Patent No. 6,443,708 (hereinafter referred to as 'prior art'), and a schematic configuration thereof will be described below with reference to FIG. do.

As shown, the displacement control valve 20 of the variable displacement compressor according to the prior art includes a valve housing 40, the valve body 30 and the electromagnetic solenoid, so that the valve body 30 as the electromagnetic solenoid is energized ) Is configured to open and close the discharge chamber connecting hole 6 formed in the valve housing 40 while reciprocating.

The valve housing 40 is provided with a suction chamber connecting hole 8, a crank chamber connecting hole 5, and a discharge chamber connecting hole 6, which receive pressure from the suction chamber, the crank chamber, and the discharge chamber of the compressor, respectively. The discharge chamber connecting hole 6 and the crank chamber connecting hole 5 have a structure in communication with each other.

The valve body 30 is reciprocated by the energization of the solenoid, and opens and closes the discharge chamber connecting hole 6 through the crank chamber connecting hole 5 while reciprocating. A spring 28 is provided at the lower portion of the valve body 30, and in the absence of external force, the valve body 30 is lowered and the discharge chamber connecting hole 6 is kept open.

The electromagnetic solenoid is configured to include a movable rod 24 connected to the valve body 30 and an electromagnetic coil 21 arranged around the movable rod 24. A movable iron core 23 is provided at the end of the movable rod 24.

On the other hand, the compressor used in the automotive air conditioner is also important cooling performance, it is important that the torque applied to the compressor is controlled so as not to interfere with the operation of the vehicle.

In particular, since a large load (torque) is applied to the vehicle during rapid acceleration or steep slope driving, it is necessary to adjust the load on the compressor of the air conditioner according to the load condition of the engine.

However, according to the conventional capacity control valve as described above, the electromagnetic force of the solenoid and the force due to Pd-Ps (pressure difference between discharge pressure and suction pressure) are used as a variable for the valve opening amount, There is a disadvantage in that it is difficult to accurately adjust the torque applied to the compressor because it is not intended to be changed only in accordance with the discharge pressure Pd.

The present invention has been made to solve the above-mentioned problems of the prior art, an object of the invention is to change the compressor pressure by the solenoid electromagnetic force by the variable displacement compressor to easily adjust the torque (load) applied to the compressor To provide a capacity control valve.

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

And a valve housing having a discharge chamber connecting space and a crank chamber connecting space, an electromagnetic solenoid, and a valve body reciprocating inside the valve housing by the electromagnetic solenoid. Characterized in that configured to change accordingly.

In this case, a first guide hole for connecting the discharge chamber connecting space and the crank chamber connecting space to each other is formed inside the valve housing.

The valve body extends from the solenoid to the discharge chamber connecting space from the electromagnetic solenoid while being supported by the off spring, and opens and closes the inlet of the first guide hole from the discharge chamber connecting space toward the crank chamber connecting space. Will be

A bellows is provided at the end of the valve body at the discharge chamber connecting space side.

The crankcase pressure is applied to the solenoid end of the valve body.

The off spring is disposed in a solenoid pressure receiving portion formed between the solenoid and the valve body.

A connecting passage is formed between the solenoid pressure receiving portion and the crankcase connecting space.

The valve housing is characterized in that the temperature deformation means for displacing the valve body in accordance with the temperature is provided.

The temperature modifying means is bimetal.

At this time, the temperature modifying means is provided between the front end of the bellows and the inner surface of the discharge chamber connecting space of the valve housing.

According to the present invention having the configuration described above, there is an advantage that the load (torque) applied to the compressor can be easily adjusted according to the load on the vehicle by configuring the discharge pressure of the compressor to be proportional to the solenoid electromagnetic force.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to FIGS. 2 to 6.

First, with reference to Figure 2 will be described schematically the structure of a capacity variable swash plate compressor is installed capacity control valve according to an embodiment of the present invention.

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).

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.

The variable displacement compressor adopted in the embodiment of the present invention adopts the solenoid type capacity control valve 100 to adjust the pressure of the crank chamber 86 by opening and closing the valve by energizing, thereby inclining the swash plate 50. To adjust the discharge capacity.

Specifically, the capacity control valve 100 according to an embodiment of the present invention, the valve housing 110, the solenoid 130, the solenoid 130, the valve housing 110 and the solenoid 130 formed with some connection holes The valve body 120 is installed to be movable.

In addition, a first guide hole 117 is formed in the valve housing 110 to guide the movement of the valve body 120.

In addition, the valve housing 110 has a crank chamber connecting space 112 and a discharge chamber connecting space 113 in which the pressure Pc of the crank chamber 86 and the pressure Pd of the discharge chamber 24 respectively work. Each is formed. In addition, the discharge chamber connection space 113 and the crank chamber connection space 112 have a structure in communication with each other through the first guide hole 117, the valve body 120 is the first guide hole (117) It is to open and close the first guide hole 117 while moving through).

In the valve housing 110, a seat surface 118 is formed such that the valve body 120 is closed from the discharge chamber connecting space 113 in the direction of the crank chamber connecting space 112.

In addition, a bellows 160 is provided at the front end of the valve body 120.

The bellows 160 is a corrugated structure in which a certain amount of air is filled so that a predetermined pressure is applied when no external load is applied, and the bellows 160 exerts a force on a component connected thereto while performing expansion / contraction by external pressure. Component.

In addition, a solenoid pressure receiving portion 136 is formed between the electromagnetic solenoid 130 and the valve body 120, and the solenoid pressure receiving portion 136 has an off spring for elastically supporting the valve body 120. 125 is disposed.

In addition, a connection passage 126 is formed between the solenoid pressure receiving portion 136 and the crankcase connecting space 112 so that the crankcase pressure Pc acts on the solenoid pressure receiving portion 136. have.

In particular, the solenoid end of the solenoid side of the valve body 120 and the end of the crankcase connecting space side have the same cross-sectional area, so that the influence of the pressure Pc of the crankcase can be eliminated in opening and closing the valve.

On the other hand, the electromagnetic solenoid 130 is a movable iron core 133 connected to the valve body 120, a fixed iron core 134a disposed to be opposed to the movable iron core 133 in the transport direction, and the movable iron core 133 ) And a solenoid housing 134 surrounding the electromagnetic coil 132 and the like.

For example, the solenoid housing 134 may be composed of an injection molding surrounding the electromagnetic coil 132 and the like.

Accordingly, the movable iron core 133 and the valve body 120 reciprocate by energization of the electromagnetic solenoid 130, and the discharge chamber connection space 113 and the crankcase connection space by the valve body 120. The inlet of the first guide hole 117 connecting between the 112 is opened and closed.

The movable iron core 133 or the valve body 120 is supported by an off-spring 125, so that the valve body 120 is raised in the absence of external force, so that the inlet of the first guide hole 117 is maintained. Is kept open.

The electromagnetic solenoid 130 is formed with a second guide hole 137 for guiding the movement of the movable iron core 133 or the valve body 120.

On the other hand, as shown in Figure 5 and 6, when the discharge temperature (Td) increases by more than the set value by connecting a temperature deformation means such as bimetal 190 between the valve housing 110 and the bellows 160 By acting a force in the direction in which the valve body 120 is opened, it is possible to lower the discharge temperature, thereby preventing damage to the compressor.

3 and 4, the operation of the capacity control valve according to the embodiment of the present invention will be described.

First, when the engine speed, indoor temperature, temperature difference, evaporator downstream temperature and pressure are detected and the signal is sent to the MCU, calculation is performed on the MCU, and when the detected thermal load exceeds the set value, the refrigerant discharge amount increases. Current signal is sent to the power supply.

Accordingly, an increased current flows through the electromagnetic solenoid 130, and as shown in FIG. 3, the movable iron core 133 and the valve body 120 have a resistance force of the off spring 125 and a discharge chamber connecting hole 113. The discharge chamber connecting hole 113 is closed by lowering the discharge pressure Pd.

As a result, the pressure inside the crank chamber 86 decreases rapidly and the inclination angle of the swash plate 50 increases rapidly, so that the discharge amount and discharge pressure of the compressor increase.

When the current flowing through the electromagnetic solenoid 130 is constant, when the discharge pressure Pd is larger than the set value, as shown in FIG. 4, the discharge pressure reduces the bellows 160 so that the first guide hole 117 is opened. .

As a result, the crank chamber pressure Pc increases, the inclination angle of the swash plate decreases, the discharge amount and the discharge pressure are maintained at the set values, and the valve is closed again.

On the contrary, when the discharge pressure Pd is smaller than the set value, since the bellows 160 is maintained in the valve closing position, the first guide hole 117 is closed.

As a result, the crank chamber pressure Pc decreases and the inclination angle of the swash plate increases, so that the discharge amount and the discharge pressure rise to the set value.

As a result, the current value transmitted to the electronic solenoid 130 has a constant relationship with the discharge pressure of the compressor, so that the torque (load) of the compressor closely related to the discharge pressure of the compressor can be easily adjusted.

For example, when the vehicle has a large driving load such as when the vehicle is rapidly accelerated or steeply sloped, the driving load applied to the vehicle is detected by reducing the amount of current transmitted to the compressor included in the vehicle air conditioning apparatus to partially sacrifice the load on the cooling system. Can be easily handled.

In the above-described operation of the present invention, the valve body 120 only shows the configuration of opening and closing the inlet, but the opening degree of the inlet of the first guide hole 117 may be adjusted according to the amount of energization. .

1 is a longitudinal sectional view showing a structure of a capacity control valve according to the prior art.

2 is a longitudinal sectional view showing an example of a variable displacement compressor according to the present invention.

3 is a longitudinal sectional view showing a closed structure of a capacity control valve according to an embodiment of the present invention.

4 is a longitudinal sectional view showing an open structure of the capacity control valve of FIG.

Figure 5 is a longitudinal sectional view showing a closed structure of a capacity control valve according to another embodiment of the present invention.

6 is a longitudinal sectional view showing an open structure of the capacity control valve of FIG.

※ Explanation of Major Components

100 ... Capacity control valve

110 ... valve housing

111. Crankcase connection space

112. Crankcase connection space

113. Connection space of discharge chamber

117 ... The first guide

120 ... valve body

130 ... electronic solenoid

131. Iron core

132 ... electromagnetic coil

134 ... solenoid housing

137 ... The Second Guide

136 ... solenoid pressure receiver

160 ... bellows

C ... variable displacement compressor

Claims (7)

A capacity control valve of a variable displacement compressor comprising a valve housing having a discharge chamber connection space and a crank chamber connection space, an electromagnetic solenoid, and a valve body reciprocating inside the valve housing by the electromagnetic solenoid, A capacity control valve of a variable displacement compressor, characterized in that the discharge pressure of the compressor is configured to vary according to the electromagnetic force of the electromagnetic solenoid. The method of claim 1, A first guide hole connecting the discharge chamber connecting space and the crank chamber connecting space to each other is formed inside the valve housing. The valve body extends from the solenoid to the discharge chamber connecting space from the electromagnetic solenoid while being supported by the off spring, and opens and closes the inlet of the first guide hole from the discharge chamber connecting space toward the crank chamber connecting space. Will be A bellows is provided at the end of the valve body at the discharge chamber connecting space side. A capacity control valve of a variable displacement compressor, characterized in that the crankcase pressure is applied to the solenoid side end of the valve body. The method of claim 2, The off spring is disposed in the solenoid pressure receiving portion formed between the solenoid and the valve element, the capacity control valve of the variable displacement compressor. The method of claim 3, And a connecting passage is formed between the solenoid pressure receiving portion and the crankcase connecting space. The method according to any one of claims 2 to 4, The valve housing is a capacity control valve of a variable displacement compressor, characterized in that the temperature deformation means for displacing the valve body in accordance with the temperature is provided. The method of claim 5, The temperature modifying means is a capacity control valve of a variable displacement compressor, characterized in that provided between the front end of the bellows and the inner surface of the discharge chamber connecting space of the valve housing. The method of claim 5, The temperature modifying means is a capacity control valve of a variable displacement compressor, characterized in that the bimetal.

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