Control valve for variable displacement compressor

Patent metadata

Field	Value
Publication number	US-9512833-B2
Application number	US-201514709447-A
Country	US
Kind code	B2
Filing date	May 11, 2015
Priority date	Feb 27, 2014
Publication date	Dec 6, 2016
Grant date	Dec 6, 2016

Abstract

A control valve according to one embodiment includes a shaft that transmits the solenoidal force to a valve element. The control valve also provides for stable operation of a variable displacement compressor even under high-temperature and high-pressure environments. 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, a valve hole formed in a passage connecting the discharge chamber communication port and the crankcase communication port, and a valve chamber formed between the valve hole and the crankcase communication port;
a valve element for opening and closing a valve section by moving toward and away from the valve hole, the valve element being arranged in the valve chamber;
a solenoid, provided on the body, which 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; and
a bleed hole that enables the refrigerant to be leaked from the discharge chamber communication port to the valve chamber while the valve section is being closed, the bleed hole having a leak passage, whose diameter is smaller than that of the valve hole, and the bleed hole being provided radially outward of the valve hole in the body,
wherein the valve hole constitutes part of a through-hole extending in a direction of axis line through a member for separating the discharge chamber communication port from the valve chamber inside the body,
wherein the through-hole and the bleed hole are formed through the member in such a manner that each of the through-hole and the bleed hole allows the discharge chamber communication port and the valve chamber to communicate with each other,
wherein the member has a flat surface with an opening at which the through-hole is open toward the discharge chamber communication port, and a raised portion protruding from the flat surface toward the discharge chamber communication port,
wherein the through-hole has a large-diameter part being open on the discharge chamber communication port side, and a small-diameter part, the small diameter part defining the passage that forms the valve hole and being open on a valve chamber side and having a diameter smaller than a diameter of the large-diameter part,
wherein the raised portion has a width smaller than the diameter of the large-diameter part, and
wherein the leak passage is open on the discharge chamber communication port side at a top surface of the raised portion.

2. The control valve, for a 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 a value of current supplied to the solenoid.

3. The control valve, for a 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.

4. The control valve, for a 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 a value of current supplied to the solenoid.

5. The control valve, for a variable displacement compressor, according to claim 1 , wherein the body includes a suction chamber communication port communicating with the suction chamber, a working chamber, which allows the suction chamber communication port and an interior of the solenoid to communicate with each other, a partition wall, which divides an internal space of the body into the valve chamber and the working chamber, and a guiding passage formed in the partition wall,
the control valve further comprising an actuating rod that transmits the solenoidal force to the valve element, wherein the actuating rod is slidably supported by the guiding passage, and one end of the actuating rod is coupled to the valve element in the valve chamber and the other end thereof is coupled to the solenoid,
wherein a guide portion, which so protrudes as to form a step, is provided on an end surface of the partition wall at a valve chamber side, and
wherein the guiding passage is open on the valve chamber side in the guide portion.

6. The control valve, for a 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 a value of current supplied to the solenoid.

7. The control valve, for a variable displacement compressor, according to claim 5 , 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 a 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 a value of current supplied to the solenoid.

9. The control valve, for a variable displacement compressor, according to claim 1 , wherein the bleed hole is formed such that the leak passage and a communication passage, whose diameter is larger than that of the leak passage, are connected in the direction of axis line, and
wherein the communication passage is open on the valve chamber side.

10. The control valve, for a variable displacement compressor, according to claim 9 , 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 a value of current supplied to the solenoid.

11. The control valve, for a variable displacement compressor, according to claim 9 , 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.

12. The control valve, for a variable displacement compressor, according to claim 11 , 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 a value of current supplied to the solenoid.

13. The control valve, for a variable displacement compressor, according to claim 9 , wherein the body includes a suction chamber communication port communicating with the suction chamber, a working chamber, which allows the suction chamber communication port and an interior of the solenoid to communicate with each other, a partition wall, which divides an internal space of the body into the valve chamber and the working chamber, and a guiding passage formed in the partition wall,
the control valve further comprising an actuating rod that transmits the solenoidal force to the valve element, wherein the actuating rod is slidably supported by the guiding passage, and one end of the actu

Assignees

• Tgk Co Ltd

Inventors

• Yoshihiro Ryousuke
• Kajiwara Morimitsu

Classifications

• F04B2027/1831

  between crankcase and suction chamber · CPC title

• F25B49/022

  Compressor control arrangements · CPC title

• F04B2027/1813

  Crankcase pressure · CPC title

• F04B2027/185

  Discharge pressure · CPC title

• F04B2027/1827

  between crankcase and discharge chamber · CPC title