CAPACITY CONTROL VALVE

Abstract

A capacity control valve capable of being downsized with the small number of parts is provided. A capacity control valve includes a valve housing provided with a suction port through which a suction fluid of suction pressure Ps passes, and a control port through which a control fluid of control pressure Pc passes, a valve element configured to be driven by a solenoid, a spring that biases the valve element in a direction opposite to a driving direction of the solenoid, and a CS valve formed by a CS valve seat 10a and the valve element and configured to open and close a communication between the control port and the suction port in accordance with a movement of the valve element. The control pressure Pc is controlled by opening and closing the CS valve.

Description

Claims

1. A capacity control valve comprising: a valve housing provided with a suction port through which a suction fluid of suction pressure passes, and a control port through which a control fluid of control pressure passes;a valve element configured to be driven by a solenoid;a spring that biases the valve element in the direction opposite to the driving direction by the solenoid; anda CS valve formed by a CS valve seat and the valve element and configured to open and close a communication between the control port and the suction port in accordance with a movement of the valve element, wherein the control pressure is controlled by opening and closing the CS valve,a guide hole with which the valve element is slidable in a substantially sealed state and which guides the valve element, and a valve chamber which is formed between the guide hole and the CS valve seat and in which a part of the valve element is housed are formed in the valve housing, anda minute gap is formed between an inner peripheral surface of the guide hole and an outer peripheral surface of the valve element, the minute gap is configured to allow a fluid to run round therethrough.

2. The capacity control valve according to claim 1, wherein the valve chamber communicates with the suction port.

3. The capacity control valve according to claim 1, wherein the valve chamber communicates with the control chamber.

4. The capacity control valve according to claim 1, wherein a seal member is provided in the outer peripheral surface of the valve element on a side opposed to the valve chamber through the guide hole and configured to prevent the pressure of the control fluid in the valve chamber from running round to a back surface side of the valve element.

5. The capacity control valve according to claim 1, wherein the CS valve seat and a guide hole into which the valve element is inserted are formed in the valve housing.

6. The capacity control valve according to claim 5, wherein the CS valve seat and the guide hole are provided in one member which partially or integrally forms the valve housing.

7. The capacity control valve according to claim 1, wherein the valve element is a pillar-shaped body having a constant cross section.

8. The capacity control valve according to claim 1, wherein the valve element also serves as a rod arranged to pass through a coil of the solenoid.

9. The capacity control valve according to claim 1, wherein the direction in which the valve element is biased by the spring is a valve opening direction of the CS valve.

10. The capacity control valve according to claim 2, wherein a seal member is provided in the outer peripheral surface of the valve element on a side opposed to the valve chamber through the guide hole and configured to prevent the pressure of the control fluid in the valve chamber from running round to a back surface side of the valve element.

11. The capacity control valve according to claim 2, wherein the CS valve seat and a guide hole into which the valve element is inserted are formed in the valve housing.

12. The capacity control valve according to claim 11, wherein the CS valve seat and the guide hole are provided in one member which partially or integrally forms the valve housing.

13. The capacity control valve according to claim 2, wherein the valve element is a pillar-shaped body having a constant cross section.

14. The capacity control valve according to claim 2, wherein the valve element also serves as a rod arranged to pass through a coil of the solenoid.

15. The capacity control valve according to claim 2, wherein the direction in which the valve element is biased by the spring is a valve opening direction of the CS valve.

16. The capacity control valve according to claim 3, wherein a seal member is provided in the outer peripheral surface of the valve element on a side opposed to the valve chamber through the guide hole and configured to prevent the pressure of the control fluid in the valve chamber from running round to a back surface side of the valve element.

17. The capacity control valve according to claim 3, wherein the CS valve seat and a guide hole into which the valve element is inserted are formed in the valve housing.

18. The capacity control valve according to claim 17, wherein the CS valve seat and the guide hole are provided in one member which partially or integrally forms the valve housing.

19. The capacity control valve according to claim 3, wherein the valve element is a pillar-shaped body having a constant cross section.

20. The capacity control valve according to claim 3, wherein the valve element also serves as a rod arranged to pass through a coil of the solenoid.