Control valve for variable displacement compressor

Patent metadata

Field	Value
Publication number	US-9556862-B2
Application number	US-201514710506-A
Country	US
Kind code	B2
Filing date	May 12, 2015
Priority date	Feb 27, 2014
Publication date	Jan 31, 2017
Grant date	Jan 31, 2017

Abstract

A control valve according to one embodiment includes a shaft that transmits the solenoidal force to a valve element. The control valve, in one example, ensures high pressure resistance at a mounting part where a control valve is mounted in a variable displacement compressor. A solenoid includes a bottomed sleeve into which the pressure of refrigerant is introduced, a core secured coaxially to the sleeve, a plunger, contained in the sleeve on its bottom side, which is displaceable integrally with the shaft in a direction of axis line, a first spring that applies the biasing force in a valve opening direction to the shaft, a second spring that applies the biasing force in a valve closing direction to the plunger, and a shaft support member, which is press-fitted such that the shaft support member is secured to an inner wall of the sleeve near its bottom portion. The second spring is set between the shaft support member and the plunger.

First claim

What is claimed is:

1. A control valve for a variable displacement compressor for varying a discharging capacity of the compressor for compressing refrigerant led into a suction chamber and discharging the compressed refrigerant from a discharge chamber, by regulating a flow rate of the refrigerant led into a crankcase from the discharge chamber, the control valve comprising:
a body having a discharge chamber communication port communicating with the discharge chamber, a crankcase communication port communicating with the crankcase, and a valve hole formed in a passage connecting the discharge chamber communication port and the crankcase communication port;
a valve element for opening and closing a valve section, the valve element being arranged in such a manner as to move toward and away from the valve hole;
a solenoid that generates a solenoidal force with which to drive the valve element in a valve closing direction in accordance with an amount of current supplied thereto, the solenoid being connected to an end of the body;
a transmitting rod that transmits the solenoidal force to the valve element, the transmitting rod being slidably supported in a direction of axis line in the body;
a spring that applies a biasing force in a valve opening direction to the transmitting rod, the spring being placed in a working chamber formed between the body and the solenoid; and
a fitting part fitted with an O-ring, the fitting part being formed by an annular groove provided in an outer peripheral surface of a connection part where the body and the solenoid are connected, the O-ring achieving sealing capability when the control valve is mounted through a mounting hole of the compressor,
wherein the body includes a partition wall, a guide portion, and a guiding passage, the partition wall dividing an internal space of the body into a valve chamber and the working chamber, the valve chamber being formed between the valve hole and the crankcase communication port, the guide portion protruding from a center of the partition wall into the working chamber, the guiding passage running through the partition wall and the guide portion in the direction of axis line,
wherein the valve element is placed in the valve chamber,
wherein the transmitting rod is slidably supported in the guiding passage, one end of the transmitting rod being coupled to the valve element in the valve chamber, the other end of the transmitting rod being coupled to the solenoid,
wherein the guide portion has a shape with an outside diameter gradually reduced from a partition wall side of the body toward a solenoid side,
wherein the spring has a shape with an outside diameter getting gradually smaller from the body side toward the solenoid side, and
wherein the guide portion coaxially extends into the spring, and the transmitting rod coaxially extends through the spring.

2. The control valve, for the variable displacement compressor, according to claim 1 ,
wherein the solenoid includes:
a sleeve secured to the body;
a core secured coaxially to the sleeve; and
a plunger contained in the sleeve and disposed opposite to the core in the direction of axis line, the plunger being displaceable integrally with the transmitting rod in the direction of axis line, and

wherein the spring is set between the partition wall and the transmitting rod, one end of the spring on the solenoid side being positioned inside of the core.

3. The control valve, for the variable displacement compressor, according to claim 1 , wherein the body has a suction chamber communication port communicating with the suction chamber, and
wherein the suction chamber communication port communicates with an interior of the solenoid through the working chamber.

4. The control valve, for the variable displacement compressor, according to claim 2 , wherein the body has a suction chamber communication port communicating with the suction chamber, and
wherein the suction chamber communication port communicates with an interior of the solenoid through the working chamber.

5. The control valve, for the variable displacement compressor, according to claim 1 , wherein the control valve is applied to a refrigeration cycle in which a refrigeration operation is performed in a supercritical range exceeding a critical temperature of the refrigerant.

6. The control valve, for the variable displacement compressor, according to claim 2 , wherein the control valve is applied to a refrigeration cycle in which a refrigeration operation is performed in a supercritical range exceeding a critical temperature of the refrigerant.

7. The control valve, for the variable displacement compressor, according to claim 3 , wherein the control valve is applied to a refrigeration cycle in which a refrigeration operation is performed in a supercritical range exceeding a critical temperature of the refrigerant.

8. The control valve, for the variable displacement compressor, according to claim 4 , wherein the control valve is applied to a refrigeration cycle in which a refrigeration operation is performed in a supercritical range exceeding a critical temperature of the refrigerant.

9. The control valve, for the variable displacement compressor, according to claim 1 , wherein control is performed such that a differential pressure between a discharge pressure of the discharge chamber and a suction pressure of the suction chamber is maintained at a preset differential pressure according to the amount of current supplied to the solenoid.

10. The control valve, for the variable displacement compressor, according to claim 2 , wherein control is performed such that a differential pressure between a discharge pressure of the discharge chamber and a suction pressure of the suction chamber is maintained at a preset differential pressure according to the amount of current supplied to the solenoid.

11. The control valve, for the variable displacement compressor, according to claim 3 , wherein control is performed such that a differential pressure between a discharge pressure of the discharge chamber and a suction pressure of the suction chamber is maintained at a preset differential pressure according to the amount of current supplied to the solenoid.

12. The control valve, for the variable displacement compressor, according to claim 4 , wherein control is performed such that a differential pressure between a discharge pressure of the discharge chamber and a suction pressure of the suction chamber is maintained at a preset differential pressure according to the amount of current supplied to the solenoid.

13. The control valve, for the variable displacement compressor, according to claim 5 , wherein control is performed such that a differential pressure between a discharge pressure of the discharge chamber and a suction pressure of the suction chamber is maintained at a preset differential pressure according to the amount of current supplied to the solenoid.

14. The control valve, for the variable displacement compressor, according to claim 6 , wherein control is performed such that a differential pressure between a discharge pressure of the discharge chamber and a suction pressure of the suction chamber is maintained at a preset differential pressure according to the amount of current supplied to the solenoid.

15. The control valve, for the variable displacement compressor, according to claim 7 , wherein control is performed such that a differential pressure between a discharge pressure of the discharge chamber and a suction pressure of the suction chamber is maintained at a preset differential pressure according to the amount of current supplie

Assignees

• Tgk Co Ltd

Inventors

• Yoshihiro Ryousuke
• Kajiwara Morimitsu

Classifications

• F04B2027/189

  between crankcase and discharge chamber · CPC title

• F04B27/1804 Primary

  Controlled by crankcase pressure · CPC title

• F04B2027/185

  Discharge pressure · CPC title

• F04B2027/1813

  Crankcase pressure · CPC title

• F04B2027/1827

  between crankcase and discharge chamber · CPC title