Capacity control valve and capacity control valve control method

Patent metadata

Field	Value
Publication number	US-2020370545-A1
Application number	US-201816763800-A
Country	US
Kind code	A1
Filing date	Nov 12, 2018
Priority date	Nov 15, 2017
Publication date	Nov 26, 2020
Grant date	—

Abstract

A capacity control valve includes: a valve body ( 10 ) having first communication passages ( 11 ), second communication passages ( 12 ), third communication passages ( 13 ), and a main valve seat ( 15 a ); a valve element ( 20 ) having an intermediate communication passage ( 29 ), a main valve portion ( 21 c ) and an auxiliary valve portion ( 23 d ); a pressure-sensitive element ( 24 ) disposed in the valve body ( 10 ); a solenoid ( 30 ) that drives a rod ( 36 ); a first biasing member ( 43 ) that biases in a valve closing direction of the main valve portion ( 21 c ); and a second biasing member ( 44 ) that biases in a valve opening direction of the main valve portion ( 21 c ), wherein the rod ( 36 ) moves relative to the valve element ( 20 ) to press the pressure-sensitive element ( 24 ). The capacity control valve can efficiently discharge a liquid refrigerant and can decrease a driving force of a compressor during a liquid refrigerant discharge operation.

First claim

1 . A capacity control valve that controls a flow rate or a pressure of a variable capacity compressor according to a valve opening of a valve unit, characterized by comprising:
a valve body including first communication passages that pass fluid under a first pressure, second communication passages that are arranged adjacent to the first communication passages and pass fluid under a second pressure, third communication passages that pass fluid under a third pressure, and a main valve seat that is disposed in a valve hole communicating the second communication passages and the third communication passages; a pressure-sensitive element that is arranged in the valve body on the side of the third communication passages and extends and contracts in response to an ambient pressure; a valve element including an intermediate communication passage that communicates the first communication passages and the third communication passages, a main valve portion that is separated from and comes into contact with the main valve seat to open and close the valve hole, and an auxiliary valve portion that is separated from and comes into contact with the pressure-sensitive element to open and close the intermediate communication passage; a solenoid that drives a rod; a first biasing member that biases in a valve closing direction of the main valve portion; and a second biasing member that biases in a valve opening direction of the main valve portion, wherein the rod moves relative to the valve element to press the pressure-sensitive element.

2 . The capacity control valve according to claim 1 , characterized in that a biasing force of the second biasing member is larger than a biasing force of the first biasing member.

3 . The capacity control valve according to claim 1 , characterized in that the first biasing member is disposed between the solenoid and the valve element.

4 . The capacity control valve according to claim 1 , characterized in that the second biasing member is disposed between the pressure-sensitive element and the rod.

5 . The capacity control valve according to claim 1 , characterized in that
the solenoid further includes a plunger connected to the rod, a core arranged between the plunger and the valve body, and an electromagnetic coil, and the second biasing member is disposed between the plunger and the core.

6 . The capacity control valve according to claim 1 , characterized in that the rod includes a locking portion that is separated from and comes contact with the valve element.

7 . The capacity control valve according to claim 1 , characterized in that the rod includes a pressing portion that presses the pressure-sensitive element.

8 . The capacity control valve according to claim 1 , characterized in that the first pressure is a suction pressure of the variable capacity compressor, the second pressure is a discharge pressure of the variable capacity compressor, and the third pressure is a pressure in a crank chamber of the variable capacity compressor.

9 . The capacity control valve according to claim 1 , characterized in that the first pressure is a pressure in a crank chamber of the variable capacity compressor, the second pressure is a discharge pressure of the variable capacity compressor, and the third pressure is a suction pressure of the variable capacity compressor.

10 . A method of controlling a capacity control valve, characterized by comprising
using the capacity control valve according to claim 1 , when the auxiliary valve portion is in an open state, bringing the main valve portion from a closed state into an open state.

11 . The capacity control valve according to claim 2 , characterized in that the first biasing member is disposed between the solenoid and the valve element.

12 . The capacity control valve according to claim 2 , characterized in that the second biasing member is disposed between the pressure-sensitive element and the rod.

13 . The capacity control valve according to claim 2 , characterized in that
the solenoid further includes a plunger connected to the rod, a core arranged between the plunger and the valve body, and an electromagnetic coil, and the second biasing member is disposed between the plunger and the core.

14 . The capacity control valve according to claim 2 , characterized in that the rod includes a locking portion that is separated from and comes contact with the valve element.

15 . The capacity control valve according to claim 2 , characterized in that the rod includes a pressing portion that presses the pressure-sensitive element.

16 . The capacity control valve according to claim 2 , characterized in that the first pressure is a suction pressure of the variable capacity compressor, the second pressure is a discharge pressure of the variable capacity compressor, and the third pressure is a pressure in a crank chamber of the variable capacity compressor.

17 . The capacity control valve according to claim 2 , characterized in that the first pressure is a pressure in a crank chamber of the variable capacity compressor, the second pressure is a discharge pressure of the variable capacity compressor, and the third pressure is a suction pressure of the variable capacity compressor.

18 . A method of controlling a capacity control valve, characterized by comprising
using the capacity control valve according to claim 2 , when the auxiliary valve portion is in an open state, bringing the main valve portion from a closed state into an open state.

19 . The capacity control valve according to claim 3 , characterized in that the second biasing member is disposed between the pressure-sensitive element and the rod.

20 . The capacity control valve according to claim 3 , characterized in that
the solenoid further includes a plunger connected to the rod, a core arranged between the plunger and the valve body, and an electromagnetic coil, and the second biasing member is disposed between the plunger and the core.

Assignees

• Eagle Ind Co Ltd

Inventors

• Hayama Masahiro
• Higashidozono Hideki

Classifications

• F04B2027/1881

  Suction pressure · CPC title

• F04B2027/1868

  Crankcase pressure · CPC title

• F04B27/1804 Primary

  Controlled by crankcase pressure · CPC title

• F04B27/18 Primary

  by varying the relative positions of a swash plate and a cylinder block · CPC title

• F16K31/0624

  Lift valves · CPC title