Capacity control valve

Patent metadata

Field	Value
Publication number	US-2020032781-A1
Application number	US-201816480281-A
Country	US
Kind code	A1
Filing date	Jan 24, 2018
Priority date	Jan 26, 2017
Publication date	Jan 30, 2020
Grant date	—

Abstract

In an exemplary embodiment, a capacity control valve is provided with a throttle valve portion 12 having a communication hole 23 and a second valve hole 12 A. The communication hole 23 is provided between a second valve portion 21 B and a third valve portion 21 A and makes an intermediate communication passage 26 communicate with a third valve chamber 4 . The second valve hole 12 A is provided between a second valve chamber 6 and the third valve chamber 4 . An amount of narrowing of the throttle valve portion 12 in relation to a stroke of a valve element 21 is large when the second valve portion 21 B initially opens by separating from a second valve seat face 6 A, and then becomes less after the initial opening of the valve. The capacity control valve is capable of shortening a start-up time and improving the operating efficiency of a variable capacity compressor.

First claim

1 . A capacity control valve controlling, in accordance with a degree of opening of a valve portion, a flow rate or a pressure inside an operation control chamber, the capacity control valve, comprising:
a valve body having a first valve chamber, a second valve chamber, and a third valve chamber, the first valve chamber communicating with a first communication passage, through which a fluid under a control chamber pressure passes, and having a first valve seat face and a second valve seat face, the second valve chamber having a first valve hole, which communicates with the first communication passage, and communicating with a second communication passage, through which a fluid under a discharge chamber pressure passes, and the third valve chamber communicating with a third communication passage, through which a fluid under a suction chamber pressure passes; a pressure-sensitive element disposed in the third valve chamber, extending and contracting in reaction to the suction chamber pressure and having a third valve seat face disposed on an extending and contracting free end; a valve element having an intermediate communication passage, a second valve portion, a first valve portion, and a third valve portion, the intermediate communication passage allowing the first valve chamber and the third valve chamber to communicate with one another through an auxiliary communication passage, the second valve portion opening and closing the first valve hole by separating from and coming into contact with the second valve seat face, the first valve hole allowing the first valve chamber and the second valve chamber to communicate with one another, the first valve portion opening and closing the auxiliary communication passage by moving in conjunction with and in the opposite direction from the second valve portion, and the third valve portion opening and closing the intermediate communication passage and the third valve chamber by separating from and coming into contact with the third valve seat face; a solenoid portion attached to the valve body and having an electromagnetic coil portion, a plunger, a stator core, and a rod connecting the plunger to the valve element, the solenoid portion operating to open and close the individual valve portions of the valve element in accordance with an electric current flowing through the electromagnetic coil portion; and a throttle valve portion having a communication hole, disposed between the second valve portion and the third valve portion and allowing the intermediate communication passage and the third valve chamber to communicate with one another, and a second valve hole, disposed between the second valve chamber and the third valve chamber, wherein an amount of narrowing of the throttle valve portion in relation to a stroke of the valve element is large during an initial valve opening, when the second valve portion separates from the second valve seat face, and becomes smaller after the initial valve opening.

2 . The capacity control valve according to claim 1 , wherein
the valve body is provided with an induction hole making the third valve chamber and the solenoid portion communicate with one another to regulate the sensitivity of the control chamber pressure to changes in the suction chamber pressure.

3 . The capacity control valve according to claim 2 , wherein
a gap portion between the rod and the stator core of the solenoid portion is provided with a clearance seal portion regulating the sensitivity of the control chamber pressure to changes in the suction chamber pressure.

4 . The capacity control valve according to claim 2 , wherein
a gap portion between the valve element and the stator core of the solenoid portion is provided with a clearance seal portion regulating the sensitivity of the control chamber pressure to changes in the suction chamber pressure.

5 . A capacity control valve controlling, in accordance with a degree of opening of a valve portion, a flow rate or a pressure inside an operation control chamber, the capacity control valve, comprising:
a valve body having a first valve chamber, a second valve chamber, and a third valve chamber, the first valve chamber communicating with a first communication passage, through which a fluid under a discharge chamber pressure passes, and having a second valve seat face, the second valve chamber having a first valve hole, which communicates with the first communication passage, and communicating with a second communication passage, through which a fluid under a control chamber pressure passes, and the third valve chamber communicating with a third communication passage, through which a fluid under a suction chamber pressure passes; a pressure-sensitive element disposed in the third valve chamber, extending and contracting in reaction to the suction chamber pressure and having a third valve seat face disposed on an extending and contracting free end; a valve element having a second valve portion, an intermediate communication passage, and a third valve portion, the second valve portion opening and closing the first valve hole by separating from and coming into contact with the second valve seat face, the first valve hole allowing the first valve chamber and the second valve chamber to communicate with one another, the intermediate communication passage allowing the second valve chamber and the third valve chamber to communicate with one another through an auxiliary communication passage, and the third valve portion opening and closing the third valve seat face, which allows the intermediate communication passage and the third valve chamber to communicate with one another; a solenoid portion attached to the valve body and having an electromagnetic coil portion, a plunger, a stator core, and a rod connecting the plunger to the valve element, the solenoid portion operating to open and close the individual valve portions of the valve element in accordance with an electric current flowing through the electromagnetic coil portion; and a throttle valve portion having a communication hole, disposed between the second valve portion and the third valve portion and allowing the intermediate communication passage and the third valve chamber to communicate with one another, and a second valve hole, disposed between the second valve chamber and the third valve chamber, wherein an amount of narrowing of the throttle valve portion in relation to a stroke of the valve element is large during an initial valve opening, when the second valve portion separates from the second valve seat face, and becomes smaller after the initial valve opening.

6 . The capacity control valve according to claim 5 , wherein
the valve body is provided with an induction hole making the third valve chamber and the solenoid portion communicate with one another to regulate the sensitivity of the control chamber pressure to changes in the suction chamber pressure.

7 . The capacity control valve according to claim 6 , wherein
a gap portion between the rod and the stator core of the solenoid portion is provided with a clearance seal portion regulating the sensitivity of the control chamber pressure to changes in the suction chamber pressure.

8 . The capacity control valve according to claim 6 , wherein
a gap portion between the valve element and the stator core of the solenoid portion is provided with a clearance seal portion regulating the sensitivity of the control chamber pressure to changes in the suction chamber pressure.

Assignees

• Eagle Ind Co Ltd

Inventors

• Higashidozono Hideki
• Hayama Masahiro

Classifications

• F04B27/1804 Primary

  Controlled by crankcase pressure · CPC title

• F16K11/02

  with all movable sealing faces moving as one unit · CPC title

• F04B2027/1831

  between crankcase and suction chamber · CPC title

• F04B2027/1827

  between crankcase and discharge chamber · CPC title

• F16K31/06

  using a magnet {, e.g. diaphragm valves, cutting off by means of a liquid} · CPC title