Expansion valve

Patent metadata

Field	Value
Publication number	US-12298048-B2
Application number	US-202118019057-A
Country	US
Kind code	B2
Filing date	Jul 27, 2021
Priority date	Aug 4, 2020
Publication date	May 13, 2025
Grant date	May 13, 2025

Abstract

An expansion valve having a high valve opening adjustment accuracy includes: a valve housing which is provided with an inlet port allowing a refrigerant from a condenser to pass therethrough and an outlet port allowing a refrigerant toward an evaporator to pass therethrough; a valve body which is driven by a solenoid; a valve seat on which the valve body sits; and an urging member configured to urge the valve body in a valve closing direction, a space is formed on a valve opening direction side of the valve body, and the refrigerant on the valve closing direction side in relation to the valve body flows into the space.

First claim

The invention claimed is:

1. An expansion valve, comprising:
a valve housing which is provided with an inlet port allowing a refrigerant from a condenser to pass therethrough and an outlet port allowing a refrigerant toward an evaporator to pass therethrough;
a valve body which is driven by a solenoid;
a valve seat on which the valve body sits; and
an urging member configured to urge the valve body in a valve closing direction,
wherein a space is formed on a valve opening direction side of the valve body,
the refrigerant on the valve closing direction side in relation to the valve body flows into the space through a communication path, and
the space is closed except for a communication through the communication path.

2. The expansion valve according to claim 1 ,
wherein the urging member is disposed in the space.

3. The expansion valve according to claim 1 ,
wherein the outlet port is provided on the valve closing direction side in relation to the valve seat, and
the space with the outlet port communicate with each other through the communication path.

4. The expansion valve according to claim 3 ,
wherein the communication path is formed in the valve body.

5. The expansion valve according to claim 3 ,
wherein the urging member is a bellows, and
the space and the inlet port are partitioned by the bellows.

6. The expansion valve according to claim 5 ,
wherein an effective pressure receiving area of the valve body is equal to an effective pressure receiving area of the bellows.

7. The expansion valve according to claim 2 ,
wherein the outlet port is provided on the valve closing direction side in relation to the valve seat, and
a communication path is provided to communicate the space with the outlet port.

8. The expansion valve according to claim 7 ,
wherein the communication path is formed in the valve body.

9. The expansion valve according to claim 4 ,
wherein the urging member is a bellows, and
the space and the inlet port are partitioned by the bellows.

10. The expansion valve according to claim 9 ,
wherein an effective pressure receiving area of the valve body is equal to an effective pressure receiving area of the bellows.

11. The expansion valve according to claim 7 ,
wherein the space and the inlet port are partitioned by a bellows.

12. The expansion valve according to claim 8 ,
wherein the urging member is a bellows; and
an effective pressure receiving area of the valve body is equal to an effective pressure receiving area of the bellows.

Assignees

• Eagle Ind Co Ltd

Inventors

• Fukudome Kohei
• Kanzaki Toshinori
• Shirafuji Keigo
• URUSHIYAMA Keichi
• EJIMA Takahiro
• FURUKAWA Kenshiro
• Hashiguchi Akihiro
• KURIHARA Daichi

Classifications

• F25B41/32

  having flow rate limiting means other than the valve member, e.g. having bypass orifices in the valve body · CPC title

• F25B2341/06

  Details of flow restrictors or expansion valves · CPC title

• F25B2500/01

  Geometry problems, e.g. for reducing size · CPC title

• F25B2500/13

  Vibrations · CPC title

• Y02B30/70

  Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating · CPC title