KR101159500B1 - Capacity control valve of variable displacement compressor - Google Patents

Abstract

PURPOSE: A capacity control valve of a variable capacity compressor is provided to discharge high pressure gas or liquid coolants by opening a connecting path of a suction chamber and a crank chamber while a bellows is contracted. CONSTITUTION: A capacity control valve of a variable capacity compressor comprises a valve unit(10), a pressure reducing unit(20), a solenoid unit(30). The valve unit increases a tilt angle of a swash plate in a compressor by secluding an inflow of refrigerants into a path of a crank chamber when an air-conditioner is operated. The valve unit minimizes the tilt angle of the swash plate inside the compressor by transferring the refrigerants to the path of the crank chamber when the air-conditioner is stopped. The pressure reducing unit is a space in which the pressure of the crank chamber flows in, and comprises a bellows, a pressure reducing chamber, a pressure reducing spring. The solenoid unit operates the valve unit to seclude the inflow of the refrigerants into the path of the crank chamber in a closure direction with an on control action, and drives the valve unit to transfer the refrigerants to the path of the crank chamber in an open direction with an off control action.

Description

CAPACITY CONTROL VALVE OF VARIABLE DISPLACEMENT COMPRESSOR

The present invention relates to a capacity control valve of a variable displacement compressor, and more particularly, to connect a crank chamber and a pressure reducing unit, and to configure a communication path between the crank chamber and the suction chamber, when the crank chamber pressure is high, the bellows of the pressure reducing unit shrinks and the crank By opening the communication path between the seal and the suction chamber, it is possible to quickly discharge the pressurized gas or liquid refrigerant by being stored in the crankcase inside the compressor for a long time during the initial air conditioner operation, thereby further preparing the compressor. The present invention relates to a capacity control valve of a variable displacement compressor that can shorten time.

In general, a cooling circuit of a vehicle air conditioner includes a condenser, an expansion valve, an evaporator, and a compressor, in which the compressor compresses refrigerant gas sucked from the evaporator and discharges the compressed gas to the condenser side.

The evaporator performs heat exchange between the refrigerant flowing in the cooling circuit and the air in the vehicle.

Since the heat of air passing through the periphery of the evaporator is usually transferred to the refrigerant flowing through the evaporator according to the heat load or the size of the cooling load, the refrigerant gas pressure at the outlet or downstream side of the evaporator reflects the magnitude of the cooling load.

Since the compressor used in the cooling circuit uses engine power whose rotational speed is changed according to driving conditions, it is impossible to control the discharge capacity by adjusting the rotational speed. Therefore, in recent years, the compressor has a proper cooling capacity regardless of the engine rotational speed. In order to obtain a large number of variable displacement compressor that can vary the discharge capacity of the refrigerant is a trend is applied.

Such a variable displacement compressor is provided with a capacity control valve for adjusting the amount of refrigerant discharge, and such a capacity control valve is usually introduced by introducing a portion of the refrigerant of the discharge pressure (Pd) discharged from the discharge chamber into the crank chamber to control the introduction amount The pressure Pc in the crank chamber is controlled.

However, the conventional capacity control valve is not connected to the crank chamber and the decompression unit, and during initial air conditioner operation, it stays in the crank chamber for a long time and the crank chamber pressure is increased due to the pressurized gas or liquid refrigerant. There was a disadvantage that the preparation operation time of the air conditioner is long.

That is, the conventional capacity control valve has no function of quickly discharging the gas or liquid refrigerant pressurized during the initial operation of the air conditioner, the preparation operation time of the air conditioner will be long.

The present invention is to improve the above-mentioned conventional problems, while connecting the crank chamber and the decompression unit, and by forming a communication path between the crank chamber and the suction chamber, when the crank chamber pressure is high, the bellows of the decompression unit contracts, the crank chamber and the suction chamber The communication path of the air conditioner is opened, and through this, it is quickly stored in the crankcase inside the compressor during the initial operation of the air conditioner, thereby rapidly discharging the pressurized gas or liquid refrigerant, thereby shortening the compressor operation time (warming up). It is an object of the present invention to provide a displacement control valve of a variable displacement compressor.

The capacity control valve of the variable displacement compressor of the present invention for achieving the above object is to block the inflow of refrigerant from the discharge chamber side passage to the crank chamber side passage when the air conditioner is operating, to increase the inclination angle of the swash plate inside the compressor, and to crank the discharge chamber side passage when the air conditioner is stopped. A valve unit including a valve, a valve seat (surface), and a valve shaft to send a refrigerant to the measurement passage to minimize the swash plate inclination angle inside the compressor; A pressure reducing unit including a pressure reducing chamber, a bellows, and a pressure reducing spring for setting an initial operating state of the bellows as a space into which the crank chamber pressure is introduced; And actuating the valve portion in the closing direction by turning on to block the refrigerant from flowing into the crank chamber side passage from the discharge chamber side passage, and turning off the valve portion in the open direction by sending the refrigerant from the discharge chamber side passage to the crank chamber side passage. A solenoid part for operating; The pressure reducing unit may be configured to induce rapid operation of the compressor using the crank chamber pressure of the crank chamber side passage instead of the suction pressure of the suction chamber side passage, and adjust the voltage of the solenoid portion according to the opening and closing direction of the valve unit. Crank chamber side passage is connected to the crank chamber to reduce the load of the part, and the crank chamber pressure is high inside the valve included in the valve unit, and is opened when the bellows is contracted so that the crank chamber pressure is guided to the suction chamber side passage. And a communication path connecting the suction chamber side passage.

In addition, the bellows included in the decompression unit is configured such that the lower portion is supported by the support, one end of the bellows and the communication path is configured to be connected to the connecting member.

In addition, the connecting member is configured to open one end of the communication path spaced apart from the front end side of the valve to guide the crank chamber pressure to the suction chamber side passage during the opening and closing operation of the valve.

In addition, the other end of the communication path is configured to be blocked by the lower end of the valve portion to block the refrigerant flow into the suction chamber side passage from the crank chamber side passage.

The solenoid part may include a coil assembly in which a coil is wound, a core that is a fixed iron core that sucks the plunger using a magnetic force when the solenoid is turned on, and a movable plunger that is sucked into the core when the solenoid is turned on and is separated from the core when the solenoid is turned off. And a plunger spring for generating a mounting tension for removing the plunger from the core when the solenoid is off, a sleeve for guiding the core and the plunger while forming a magnetic field rod, and a case for forming the solenoid rod while wrapping the coil assembly; And a plate that forms a magnetic field rod between the case and the plunger in a thin washer shape.

In addition, the valve is configured to penetrate through the valve body, the inner wall surface of the valve body is formed with a groove filled with a lubrication for guiding the smooth opening and closing operation of the valve.

As described above, the present invention constitutes a communication path between the crank chamber and the suction chamber while connecting the crank chamber and the decompression unit. As a result, the bellows of the decompression unit contracts when the crank chamber pressure is high, thereby opening the communication path between the crank chamber and the suction chamber. During operation, it is expected to have an effect of shortening the operating time (warming up) of the compressor, and further, the air conditioner by rapidly discharging the pressurized gas or liquid refrigerant due to long-term storage in the crank chamber inside the compressor.

1 is a cross-sectional view showing an operation state of the capacity control valve when the solenoid on operation and the crankcase pressure Pc is lower than the set pressure in an embodiment of the present invention.
Figure 2 is an enlarged cross-sectional view of the upper end for Figure 1 as an embodiment of the present invention.
3 is an enlarged cross-sectional view of the lower end of FIG. 1 as an embodiment of the present invention.
4 is a cross-sectional view showing the operation state of the capacity control valve when the solenoid on operation and the crankcase pressure (Pc) is higher than the set pressure in an embodiment of the present invention.
FIG. 5 is an enlarged cross-sectional view of the upper portion of FIG. 4 as an embodiment of the present invention; FIG.
6 is a cross-sectional view showing an operation state of the capacity control valve during the solenoid off operation in an embodiment of the present invention.
FIG. 7 is an enlarged cross-sectional view of the upper portion of FIG. 6 according to an embodiment of the present invention; FIG.

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

1 is a cross-sectional view illustrating an operation state of a capacity control valve when a solenoid on operation and a crankcase pressure Pc are lower than a set pressure in an embodiment of the present invention, and FIG. 2 is an upper portion of FIG. 1 as an embodiment of the present invention. 3 is an enlarged cross-sectional view, and FIG. 3 illustrates an enlarged cross-sectional view of a lower end portion of FIG. 1 according to an exemplary embodiment of the present invention.

4 is a cross-sectional view illustrating an operation state of a capacity control valve when the solenoid on operation and the crankcase pressure Pc are higher than the set pressure in an embodiment of the present invention, and FIG. 5 is an upper portion of FIG. 4 as an embodiment of the present invention. An enlarged cross-sectional view is shown.

6 is a cross-sectional view illustrating an operation state of a capacity control valve during a solenoid off operation according to an embodiment of the present invention, and FIG. 7 is an enlarged cross-sectional view of the upper portion of FIG. 6 according to an embodiment of the present invention.

1 to 7, a displacement control valve of a variable displacement compressor according to an exemplary embodiment of the present invention typically includes a valve unit 10, a pressure reduction unit 20, and a solenoid unit 30. This includes a method of achieving maximum variable capacity at the same time of operating the air conditioner to achieve rapid cooling, that is, a method of shortening the warm-up time early in the air conditioner operation, simplifying the structure around the plunger and the number of parts It is made of a structure that can reduce the size of the product while minimizing.

Accordingly, the valve unit 10 blocks the inflow of the refrigerant from the discharge chamber side passage (a) to the crank chamber side passage (b) during operation of the air conditioner, thereby increasing the inclination angle of the swash plate inside the compressor to generate a high temperature by the piston suction and compression of the cylinder chamber. It generates high-pressure gas refrigerant to the condenser, and when the air conditioner stops, the refrigerant is sent from the discharge chamber side passage (a) to the crank chamber side passage (b) to minimize the inclination angle of the internal swash plate of the compressor to perform piston suction and compression of the cylinder chamber. The valve 11, the valve body 12, the valve seat (surface) 13, and the valve shaft 14 were configured to stop the refrigerant circulation in the air conditioner.

At this time, the valve 11 is penetrated through the valve body 12, the inner wall surface of the valve body 12 is filled with a lubricant for guiding the opening and closing operation of the valve 11 is smoothly filled (12a) ) Was formed.

The decompression unit 20 is a space into which the crank chamber pressure Pc flows through the crank chamber side passage b, and sets an initial operating state of the decompression chamber 21, the bellows 22, and the bellows 22. The decompression unit 20 uses a crankcase pressure Pc of the crankcase side passage b instead of the suction pressure Ps of the suction chamber side passage c. It is configured to connect with the crank chamber to reduce the load of the solenoid portion 30 by inducing rapid operation and adjusting the voltage of the solenoid portion 30 according to the opening and closing direction of the valve portion 10.

At this time, the crankcase pressure Pc is high inside the valve 11 included in the valve unit 10 and is opened when the bellows 22 is contracted so that the crankcase pressure Pc is the suction chamber side passage c. The communication path 40 which connects the crank chamber side passage (b) and the suction chamber side passage (c) is configured to guide to).

In addition, the bellows 22 included in the decompression unit 20 is configured to support the lower portion by the support 25, and one end of the bellows 22 and the communication path 40 is a connection member 26. The other end of the communication path 40 is configured such that the refrigerant inflow from the crank chamber side passage (b) to the suction chamber side passage (c) is blocked by the valve (11).

Here, the communication path 40 is opened when the connection member 26 is spaced apart from the front end portion 11a of the valve 11 according to the opening and closing operation of the valve 11, and thus the communication path 40 Through the crank chamber pressure (Pc) is to be guided to the suction chamber side passage (c).

The solenoid part 30 is operated on to block the refrigerant from flowing into the crank chamber side passage b from the discharge chamber side passage a to operate the valve 11 included in the valve portion 10 in the closing direction. The coil 31 is wound by operating the valve 11 included in the valve part 10 in the open direction by turning off the refrigerant to send the refrigerant from the discharge chamber side passage a to the crank chamber side passage b. A coil assembly 32, a core 33 which is a fixed iron core that sucks the plunger 34 by using a magnetic force when the solenoid is on, and a core 33 which is sucked into the core 33 when the solenoid is on and are separated from the core 33 when the solenoid is off A plunger 34 which is a movable iron core, a plunger spring 35 which generates a mounting tension for detaching the plunger 34 from the core 33 when the solenoid is off, and the core 33 and the plunger while forming a magnetic field rod. A sleeve 36 for guiding 34; A case 37 surrounding the coil assembly 32 to form a solenoid rod, and a plate 38 having a thin washer shape to form a magnetic field rod between the case 37 and the plunger 34. will be.

As described above, the capacity control valve of the variable displacement compressor according to the embodiment of the present invention, as shown in FIGS. 1 to 3, when the crankcase pressure Pc of the crankcase side passage b is not greater than the set pressure. That is, when the air conditioner is normally operated without being overloaded, first the energization is made to the solenoid part 30, and the core 33 included in the solenoid part 30 is sucked by the suction force generated by the magnetic field. To pull the plunger spring 35 into compression.

Then, while the valve shaft 14 and the valve 11 of the valve portion 10 pressed into the plunger 34 interlock with each other, the groove portion 12a in which the valve 11 is formed on the inner wall surface of the valve body 12. ) Smoothly slides for opening and closing by the lubricant filled in contact with the valve seat (13).

Then, one end of the communication path 40 formed in the valve 11 is blocked by the left and right expansion wings 26a of the connecting member 26 in contact with the front end portion 11a of the valve 11, Since the rear end 11b of the valve 11 located at the other end of the communication path 40 is opened, it is assumed that the discharge chamber pressure Pd of the discharge chamber side passage a flows into the crank chamber side passage b. Blocking increases the inclination angle of the swash plate as well as increases the piston stroke, which can increase the discharge amount from the compressor to the condenser while the compressor compression is actively performed.

On the other hand, when the initial air conditioner is operated in a state in which the crankcase pressure Pc of the crankcase passage b is higher than the set pressure, the bellows included in the decompression unit 20 as shown in FIGS. 4 and 5. Shrinkage of the (22) is made, and thus the left and right expansion wings (26a) of the connecting member 26 is spaced apart from the front end portion (11a) of the valve 11, of course, one end of the communication path 40 is opened, Since the other end of the communication path 40 is opened while the rear end 11b of the valve 11 is spaced apart, this opens a passage from the crank chamber side passage b to the suction chamber side passage c.

That is, the communication path 40 formed inside the valve 11 included in the valve unit 10 has a high crankcase pressure Pc and is opened when the bellows 22 is contracted by the crankcase passage. (b) is connected to the suction chamber side passage (c), so that the crankcase pressure Pc of the crank chamber side passage (b) is guided to the suction chamber side passage (c) from the opening of the communication path (40). It can be.

Then, during the initial air conditioner operation, the gas or liquid refrigerant is rapidly discharged due to long-term storage in the crankcase inside the compressor, and accordingly, the inclination of the swash plate is shortened while the compressor's preparation operation time (warming up) is shortened. The larger the variable capacity can be secured, and as a result, the air conditioner performance can be achieved with the maximum variable capacity at the same time as the air conditioner is operated, thereby enabling rapid cooling.

Here, when the room becomes cool after a predetermined time elapses after the air conditioner is turned on, the current supplied to the solenoid unit 30 is gradually reduced and shut off by the control of the controller, so that the capacity control valve can be switched to a normal operation state. do.

That is, when the solenoid portion 30 is turned off, as shown in FIGS. 6 and 7, the magnetic field is lost, and thus, the suction force of the core 33 pulling the plunger 34 is lost, and thus the plunger ( 34 is separated from the core 33 by the mounting tension of the compressed plunger spring 35.

Then, the valve shaft 14 press-fitted to the plunger 34 and the valve 11 connected thereto are interlocked, so that the valve 11 is separated from the valve seat 13 and thus the discharge chamber side passage a The discharge chamber pressure Pd flows into the crank chamber side passage b.

Then, as the inclination angle of the swash plate is reduced, the piston stroke is reduced, and thus the compression action of the compressor is stopped, as well as the discharge operation from the compressor to the condenser is stopped.

In this case, since the compressor is in a normal operating state, the pressure inside the compressor is not higher than the set value, that is, the internal pressure of the compressor is smaller than the mounting tension of the pressure reducing spring 23 configured in the bellows 22, so that the valve 11 The communication path 40 formed in the c) is blocked, thereby allowing the inflow of the refrigerant from the crank chamber side passage (b) to the suction chamber side passage (c).

Although the technical idea of the capacity control valve of the variable displacement compressor of the present invention has been described above with the accompanying drawings, this is illustrative of the best embodiment of the present invention and is not intended to limit the present invention.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined by the appended claims. It is to be understood that such changes and modifications are within the scope of the claims.

10; Valve portion 11; valve
12; Valve body 12a; Groove
13; Valve seat 14; Valve shaft
20; A pressure reducing unit 21; Decompression chamber
22; Bellows 23; Decompression spring
25; Support 26; Connecting member
30; Solenoid portion 31; coil
32; Coil assay 33; core
34; Plunger 35; Plunger spring
36; Sleeve 37; case
38; Plate 40; Communication path

Claims (6)

When the air conditioner operates, it blocks the inflow of refrigerant from the discharge chamber side passage to the crank chamber side passage to increase the inclination angle of the swash plate inside the compressor. And a valve unit including a valve seat and a valve shaft; A decompression unit including a decompression chamber, a bellows, and a decompression spring for setting an initial operating state of the bellows into a space into which the crank chamber pressure flows; And actuating the valve unit in the closing direction by blocking the refrigerant from flowing into the crank chamber side passage from the discharge chamber side passage, and operating the valve unit in the open direction by operating the valve unit in the closing direction to send the refrigerant from the discharge chamber side passage to the crank chamber side passage. Solenoid portion; Including but not limited to
The decompression unit induces rapid operation of the compressor by using the crank chamber pressure of the crank chamber side passage instead of the suction pressure of the suction chamber side passage, and adjusts the voltage of the solenoid portion in accordance with the opening and closing direction of the valve portion to reduce the load of the solenoid portion. Make connection with the crankcase,
The crankcase pressure is high inside the valve included in the valve unit, and the bellows is opened when the bellows is contracted to form a communication path connecting the crankcase side passage and the suction chamber side passage to guide the crankcase pressure to the suction chamber side passage. A capacity control valve of a variable displacement compressor. The method of claim 1,
The bellows included in the decompression unit is configured so that the lower portion is supported by a support, and one end of the bellows and the communication passage is connected to the connecting member by a capacity control valve, characterized in that the configuration. The method of claim 2,
The connecting member is configured to open one end of the communication path spaced apart from the front end side of the valve to guide the crank chamber pressure to the suction chamber side passage during the opening and closing operation of the valve. . The method of claim 1,
The other end of the communication path is configured to be blocked by the lower end of the valve to block the flow of refrigerant from the crank chamber side passage to the suction chamber side passage capacity control valve of the variable displacement compressor. The method of claim 1, wherein the solenoid portion,
A coil assembly to which the coil is wound, a core fixed core that sucks the plunger by using magnetic force when the solenoid is on, a plunger which is sucked into the core when the solenoid is on and deviates from the core when the solenoid is off, and the solenoid off when the core is wound A plunger spring for generating a mounting tension for releasing the plunger from the core, a sleeve for guiding the core and the plunger while forming a magnetic field rod, a case for forming a solenoid rod while surrounding the coil assembly, and a thin washer shape A capacity control valve of a variable displacement compressor, comprising a plate forming a magnetic field rod between the case and the plunger. The method of claim 1,
Wherein the valve is configured to penetrate through the valve body, the inner wall surface of the valve body is a capacity control valve of a variable displacement compressor, characterized in that for forming a groove filled with a lubrication for guiding the smooth opening and closing operation of the valve.

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