Capacity control valve

Patent metadata

Field	Value
Publication number	US-9714646-B2
Application number	US-201314419448-A
Country	US
Kind code	B2
Filing date	Dec 4, 2013
Priority date	Dec 12, 2012
Publication date	Jul 25, 2017
Grant date	Jul 25, 2017

Abstract

A capacity control valve includes: intake-side passages connecting an intake chamber that takes in fluid and a control chamber; a pressure-sensitive chamber formed midway along the intake-side passages; a liquid-refrigerant discharge valve that receives the pressure of the control chamber to open and close the intake-side passages; a pressure-sensitive body placed in the pressure-sensitive chamber, which extends to apply a biasing force to the liquid-refrigerant discharge valve in the direction of closing the valve, while contracting as the ambient pressure increases; and a solenoid that applies an electromagnetic drive force to control the main valve; wherein the pressure-sensitive body is supported on one side by the driving rod of the solenoid in a manner permitting relative motion, while connected on the other side to the liquid-refrigerant discharge valve, wherein the discharge valve structure and discharge flow passages for discharging liquid refrigerant are simplified.

First claim

The invention claimed is:

1. A capacity control valve for controlling a variable-capacity compressor, the variable-capacity compressor having: an intake chamber that takes in fluid; a discharge chamber that discharges the fluid; and a control chamber that controls a discharge rate of the fluid, the capacity control valve comprising:
discharge-side passages connecting the discharge chamber and the control chamber;
a main valve chamber formed somewhere along the discharge-side passages;
a main valve that opens and closes the discharge-side passages in the main valve chamber;
intake-side passages connecting the intake chamber and the control chamber;
a pressure-sensitive chamber formed somewhere along the intake-side passages;
a liquid-refrigerant discharge valve including a movable valve body that receives a pressure of the control chamber to open and close the intake-side passages;
a pressure-sensitive body placed in the pressure-sensitive chamber, which extends to apply a biasing force to the liquid-refrigerant discharge valve in a direction of closing the liquid-refrigerant discharge valve, while contracting as an ambient pressure increases; and
a solenoid having a coil that generates an electromagnetic drive force to control the main valve;
wherein when the coil of the solenoid is energized with a specified or greater current, the discharge-side passages are blocked by the main valve, and
wherein the pressure-sensitive body is supported on one side by a driving rod of the solenoid in a manner permitting motion relative to the driving rod, while connected on the other side to the movable valve body of the liquid-refrigerant discharge valve.

2. A capacity control valve according to claim 1 , wherein an elastic body is provided that pressurizes the movable valve body of the liquid-refrigerant discharge valve in a direction of closing the liquid-refrigerant discharge valve.

3. A capacity control valve according to claim 1 , wherein an elastic body is provided that pressurizes the movable valve body of the liquid-refrigerant discharge valve in a direction of opening the liquid-refrigerant discharge valve.

4. A capacity control valve according to claim 1 , wherein an elastic body is provided that pressurizes the movable valve body of the liquid-refrigerant discharge valve in a direction of closing the liquid-refrigerant discharge valve, along with an elastic body that pressurizes the movable valve body of the liquid-refrigerant discharge valve in a direction of opening the liquid-refrigerant discharge valve.

Assignees

• Eagle Ind Co Ltd

Inventors

• Shirafuji Keigo
• Kanzaki Toshinori
• Nishimura Naoki
• Higashidozono Hideki

Classifications

• F04B2027/1831

  between crankcase and suction chamber · CPC title

• F04B2027/1827

  between crankcase and discharge chamber · CPC title

• F04B2027/1886

  Open (not controlling) fluid passage · CPC title

• F04B2027/1813

  Crankcase pressure · CPC title

• F04B27/14 Primary

  Control · CPC title