KR101083671B1 - Displacement control valve of variable displacement compressor - Google Patents

Abstract

In the displacement control valve of the variable displacement compressor of the present invention, the capacity control valve of the variable displacement compressor, the crank chamber connection hole, the discharge chamber connection hole and the suction chamber connection hole which receives the crank chamber pressure, the discharge chamber pressure and the suction chamber pressure of the compressor A valve housing formed inside the valve housing, the valve housing passing through the discharge chamber connecting hole and the crank chamber connecting hole respectively; An additional flow passage connecting the crank chamber connection hole and the suction chamber connection hole; A valve body for opening and closing the guide hole inlet and the bleeding passage while reciprocating; An electromagnetic solenoid for reciprocating the valve body; A cap fixedly installed at an end of the valve housing to form a connection flow path which is a part of the bleeding flow path between an outer surface of the valve body; And a sleeve connecting the solenoid and the valve body.

Accordingly, when the crankcase pressure of the compressor is rapidly increased by the bleeding flow passage, it can be quickly discharged to the suction chamber.

Capacity variable compressors, capacity control valves, bleeding channels

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 that can be quickly discharged when the crankcase pressure of the compressor rapidly increases.

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 rotates according to the rotational motion of the rotary 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, 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.

Hereinafter, the capacity control valve of the prior art will be schematically described with reference to the drawings.

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

As shown in FIG. 1, the capacity control valve 10 according to the related art is installed to be movable in the valve housing 11, the electromagnetic solenoid 13, and the valve housing 11 in which some connection holes are formed. The valve body 12 is included.

The valve housing 11 is provided with a guide hole 14 for guiding the movement of the valve body 12.

In particular, as the electromagnetic solenoid 13 is energized, the valve body 12 is configured to open and close the guide hole 14 formed in the valve housing 11 while reciprocating.

The valve housing 11 has a crank chamber connecting hole 15 and a discharge chamber connecting hole 16 in which the pressure Pc of the crank chamber and the pressure Pd of the discharge chamber respectively act. The discharge chamber connecting hole 16 and the crank chamber connecting hole 15 are configured to communicate with each other through the guide hole 14.

In addition, the valve housing 11 has a suction chamber connecting hole 17 formed at a lower end of the discharge chamber connecting hole 16.

In addition, a sleeve member 18 is provided at the end of the valve body 12 to be configured to connect between the valve body 12 and the solenoid 13.

Meanwhile, a sleeve bore 19 is formed in the valve housing 11 in which the sleeve member 18 is installed, and a sleeve 20 corresponding to the sleeve bore 19 is formed in the sleeve member 18. .

In addition, the sleeve member 18 is provided with an accommodating portion 21 therein, and the accommodating portion 21 is provided with a bellows 22.

The valve housing 11 is provided with a cap 23 which is screwed in a state facing the end of the valve body 12, and a support spring 24 between the valve body 12 and the cap 23. The expansion force of the bellows 22 and the expansion force of the first spring 25 installed therein is regulated.

On the other hand, the cap 23 is formed so that a part is open is configured to act on the pressure (Pc) of the crank chamber.

However, the capacity control valve according to the prior art has not been disclosed to discharge the crankcase liquid refrigerant when the crankcase liquid refrigerant suddenly increases due to vaporization of the crankcase liquid refrigerant during the initial operation of the compressor or abnormal operation of the compressor. .

The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a capacity control valve of a variable displacement compressor capable of quickly discharging when the pressure of the crankcase rapidly increases. .

The capacity control valve of the variable displacement compressor of the present invention for achieving the above object is, in the capacity control valve of the variable displacement compressor, the crank chamber connection hole and the discharged crank chamber pressure and discharge chamber pressure and suction chamber pressure of the compressor A valve housing having a seal connecting hole and a suction chamber connecting hole respectively formed therein and configured to allow a guide hole through the discharge chamber connecting hole and the crank chamber connecting hole to pass therethrough; An additional flow passage connecting the crank chamber connection hole and the suction chamber connection hole; A valve body for opening and closing the guide hole inlet and the bleeding passage while reciprocating; An electromagnetic solenoid for reciprocating the valve body; A cap fixedly installed at an end of the valve housing to form a connection flow path which is a part of the bleeding flow path between an outer surface of the valve body; And a sleeve connecting the solenoid and the valve body.

The valve body may include a small diameter portion and a large diameter portion formed at the bottom of the small diameter portion and having a diameter larger than the diameter of the small diameter portion. The connection passage may include a guide groove and a valve body formed under the cap. It is preferably formed between the small diameter portion of the large diameter portion of the valve body in accordance with the reciprocating movement of the valve body to open and close the connection flow path and the guide hole inlet.

The bleeding flow passage is formed between the valve passage and the sleeve, the inflow passage formed in the sleeve and the inflow passage connected to the connection passage, the intermediate passage formed in the sleeve, and connected to the inflow passage. It is preferable that a discharge passage connecting the intermediate passage and the suction chamber connecting hole is formed.

On the other hand, the large diameter portion of the valve body is preferably configured to close the inlet of the guide hole during the energization of the electromagnetic solenoid and open the connection flow path, while opening the inlet of the guide hole and close the connection flow path during power cut.

According to the capacity control valve of the variable displacement compressor according to the present invention, when the crankcase pressure of the compressor rapidly increases due to the bleeding flow passage, it can be quickly discharged to the suction chamber.

That is, the liquid refrigerant evaporated from the crank chamber during the initial operation of the compressor smoothly discharged to the suction chamber to prevent the operation delay of the compressor and at the same time easy to move to the maximum inclination angle of the swash plate.

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

Figure 2 is a longitudinal sectional view showing the structure of the variable displacement compressor according to the present invention, Figure 3 is a longitudinal sectional view showing the structure of the displacement control valve of Figure 2, Figure 4 is an enlarged view of a portion of the displacement control valve of Figure 3 Longitudinal section.

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 in FIG. 2, the variable displacement 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 thereof, and a cylinder block 10 of the cylinder block 10. The front housing 16 is hermetically coupled to the front, and the rear housing 18 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. 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 variable displacement compressor adopted in the embodiment of the present invention adopts the electromagnetic solenoid type capacity control valve 100 to adjust the pressure of the crank chamber 86 by opening and closing the valve by energization, through which the swash plate 50 It is designed to adjust the discharge capacity by adjusting the inclination angle of), and can be applied to all compressors of this characteristic.

Hereinafter, the capacity control valve 100 according to the present invention will be described in detail.

3 and 4, the capacity control valve 100 according to the present invention, the valve housing 110, the electromagnetic solenoid 130, a plurality of connection holes are formed in the interior of the valve housing 110 It includes the valve body 120 which is installed possibly.
The valve body 120 has a structure in which a large diameter portion 122 having a diameter larger than the diameter of the small diameter portion 123 is formed below the small diameter portion 123.

In addition, a guide hole 117 is formed in the valve housing 110, and as the electromagnetic solenoid 130 is energized or disconnected, the valve body 120 reciprocates and the guide hole 117 moves. ) Is to open and close.

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The valve housing 110 is formed with a crank chamber connecting hole 112 and a discharge chamber connecting hole 113 in which the pressure Pc of the crank chamber 86 and the pressure Pd of the discharge chamber 24 respectively work. have. The discharge chamber connecting hole 113 and the crank chamber connecting hole 112 are configured to communicate with each other through the guide hole 117.

In addition, the valve housing 110 has a suction chamber connecting hole 111 formed at a lower end of the discharge chamber connecting hole 113.

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

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In addition, the valve body 120 is provided with a sleeve 140, the sleeve 140 is configured to connect between the valve body 120 and the electromagnetic solenoid 130.

Meanwhile, a sleeve bore 119 is formed in the valve housing 110 in which the sleeve 140 is installed, and a needle 141 corresponding to the sleeve bore 119 is formed in the sleeve 140. The needle 141 is preferably formed larger than the diameter of the valve body 120.

In addition, the needle 141 is preferably fixedly coupled to the valve body 120.

In addition, a cap 165 is fixed to the end of the valve housing 110 by screwing, and a connection passage 155 is formed between the cap 165 and the outer surface of the valve body 120. .
The cap 165 is configured such that the pressure Pc of the crank chamber 86 acts.

In addition, the bleeding flow path 150 is formed between the crank chamber 86 and the suction chamber 22 by the movement of the sleeve 140.

Specifically, the bleeding flow path 150 is formed in the connection flow path 155 and the sleeve 140 and formed in the inflow flow path 156 and the sleeve 140 connected to the connection flow path 155. An intermediate flow passage 153 connected to the inflow passage 156, formed between the valve housing 110 and the sleeve 140, and a discharge passage connecting the intermediate passage 153 and the suction chamber connecting hole 111 ( 157).

Specifically, the valve body 120 is composed of a small diameter portion 123 and a large diameter portion 122 formed on the bottom of the small diameter portion 123 and having a diameter larger than the diameter of the small diameter portion 123, The connection flow path 155 is formed between the guide groove 151 formed under the cap 165 and the small diameter portion 123 of the valve body 120, and the large diameter portion of the valve body 120 ( 122 opens and closes the inlet and connecting passage 155 of the guide hole 117.

In addition, an inflow passage 156 is formed in the sleeve 140 to connect the connection passage 155 and the intermediate passage 153, and the intermediate passage 153 is formed between the valve housing 110 and the sleeve 140. And a discharge passage 157 connecting the suction chamber connecting hole 111 to each other.

The large diameter portion 122 of the valve body 120 connects the connection passage 155 at the time of initial driving of the compressor in which the crank chamber 86 pressure Pc of the compressor is rapidly increased by the bleeding passage 150 configured as described above. The crank chamber 86 pressure Pc is quickly discharged to the suction chamber 22 by opening.

That is, when a current is applied to the solenoid 130, the large diameter portion 122 formed in the valve body 120 moves downward to open the connection passage 155, and when the current is blocked in the solenoid 130, the large diameter portion 122 is to move to the top to close the connection passage 155.

The liquid refrigerant evaporated from the crank chamber 86 is smoothly discharged into the suction chamber 22 during the initial driving of the compressor by the driving of the bleeding flow passage 150 operating as described above, thereby preventing the operation delay of the compressor and at the same time swash plate ( It is easy to move to the maximum inclination angle of 50).

In addition, the electromagnetic solenoid 130 surrounds the movable iron core 131 connected to the sleeve 140, the electromagnetic coil 132 disposed around the movable iron core 131, the electronic coil 132, and the like. It is composed of a solenoid housing 134, a fixed iron core 133 disposed inside the electromagnetic coil 132 and a rod 135 coupled to the fixed iron core 133 and fixed to the bellows 160 to be described later.

The solenoid housing 134 corresponds to an injection molded product or an insulating case surrounding the electronic coil 132.

In addition, the movable iron core 131 is formed with a rod guide hole (131a) for guiding the movement of the rod (135).

Accordingly, the movable iron core 131, the sleeve 140, and the valve body 120 reciprocate by the energization of the solenoid 130, and the discharge chamber connecting hole 113 by the valve body 120. ) And the entrance of the guide hole 117 connecting between the crank chamber connecting hole 112 is opened and closed.

Specifically, as shown in FIG. 4, an off-spring 125 is installed between the fixed iron core 133 and the movable iron core 131, so that the valve body 120 is normally used without external force. While rising to maintain the inlet of the guide hole 117 is open, the connecting passage 155 is maintained in a closed state by the large diameter portion 122 of the valve body 120 is raised.
On the other hand, when the solenoid 130 is energized during the initial driving of the compressor, on the contrary, the valve body 120 is lowered to maintain the inlet of the guide hole 117 while the connection flow path 155 is the valve body 120. Large diameter portion 122 of the lowered to maintain the open state.

In addition, the rod 135 may be screwed with the fixed iron core 133 to adjust an initial set value of the bellows 160 to be described later by the rotation of the rod 135.

In addition, the maximum opening amount of the valve body 120 is limited by the inner surface of the valve housing 110 in which one surface of the sleeve 140 and the guide hole 117 are formed.

In addition, an accommodating part 170 is formed inside the sleeve 140, and a bellows 160 is installed in the accommodating part 170.

On the other hand, the receiving portion 170 is directly connected to the suction chamber 22, the suction chamber pressure (Ps) is applied.

In addition, an insertion groove 161 is formed in the bellows 160, and an insertion hole 135a corresponding to the insertion groove 161 is formed in the rod 135 to be fixedly coupled to prevent relative movement.

On the other hand, the opposite end is not formed the insertion groove 161 of the bellows 160 is preferably fixed to the inside of the sleeve (140).

In addition, the first support spring 162 may be built in the bellows 160 to maintain the expanded state.

In addition, a communication groove 131b is formed in the movable iron core 131 so as to communicate with the suction chamber connecting hole 111.

Accordingly, the pressure Ps of the suction chamber 22 may also be applied to the movable iron core 131 and the sleeve member 140.

Furthermore, the suction solenoid gas having the pressure Ps of the suction chamber 22 passes through the solenoid housing 134 so that the electronic solenoid 130 portion can be effectively cooled. Accordingly, the reliability of the electronic solenoid 130 is increased, and the electronic solenoid 130 can accurately generate an electromagnetic force proportional to the current without being affected by the generated heat.

Meanwhile, a ring groove 136 is formed in the rod 135, and an O-ring 137 is inserted into the ring groove 136 to prevent the leakage of the refrigerant introduced through the communication groove 131b.

In addition, a filter 180 is installed in the discharge chamber connecting hole 113 to serve to block foreign substances from entering the control valve.

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.

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

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

3 is a longitudinal sectional view showing the structure of the displacement control valve of FIG.

4 is an enlarged longitudinal sectional view of a portion of the capacity control valve of FIG. 3.

* Description of symbols on main parts of the drawings *

100 ... Capacity control valve

110 ... valve housing

111 ... Suction Room Connector

112. Crankcase connector

113.Discharge chamber connection

117 ... the guide

119 ... Sleeve Bore

120 ... valve body

121 ... Chin

122 ... Dae Kyung

123 ... small neck

130 ... electronic solenoid

131. Iron core

132 ... electromagnetic coil

134 ... solenoid housing

137 ... Road Guide

140 ... sleeve

150. Additional Euro

160 ... bellows

170 ... bellows receptacle

C ... variable displacement compressor

Claims (4)

In the displacement control valve of the variable displacement compressor, A crank chamber connection hole, a discharge chamber connection hole, and a suction chamber connection hole are formed inside the crank chamber pressure, the discharge chamber pressure, and the suction chamber pressure of the compressor, respectively, and the guide hole crossing the discharge chamber connection hole and the crank chamber connection hole passes through. A valve housing so formed; An additional flow passage connecting the crank chamber connection hole and the suction chamber connection hole; A valve body for opening and closing the guide hole inlet and the bleeding passage while reciprocating; An electromagnetic solenoid for reciprocating the valve body; A cap fixedly installed at an end of the valve housing to form a connection flow path which is a part of the bleeding flow path between an outer surface of the valve body; And, And a sleeve connecting the electromagnetic solenoid and the valve body. The method of claim 1, The valve body is composed of a small diameter portion and a large diameter portion formed at the bottom of the small diameter portion and having a diameter larger than the diameter of the small diameter portion, The connection flow passage is formed between the guide groove formed in the lower portion of the cap and the small diameter portion of the valve body, And the large diameter part opens and closes a connection flow path with the inlet of the guide hole in response to the reciprocating movement of the valve body. 3. The method of claim 2, The bleeding flow passage is formed between the valve housing and the sleeve, the intermediate flow passage formed in the sleeve and the inflow flow passage formed in the sleeve and connected to the connection flow passage, and formed in the sleeve and connected to the inflow flow passage. A displacement control valve of a variable displacement compressor, characterized in that the discharge passage connecting the flow path and the suction chamber connecting hole is formed. The method of claim 2 or 3, The large diameter portion of the valve body is configured to close the inlet of the guide hole when the energization of the electromagnetic solenoid and open the connection passage, while opening the inlet of the guide hole and close the connection passage during the power cut Capacity control valve.

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