Electronic expansion valve

Patent metadata

Field	Value
Publication number	US-11906217-B2
Application number	US-201917287845-A
Country	US
Kind code	B2
Filing date	Oct 25, 2019
Priority date	Oct 27, 2018
Publication date	Feb 20, 2024
Grant date	Feb 20, 2024

Abstract

An electronic expansion valve includes a valve seat assembly, a first pipe connecting portion, and a second pipe connecting portion. The valve seat assembly includes an outer wall portion, a valve port portion having a valve port, a first valve seat cavity, and a second valve seat cavity. The first valve seat cavity is located above the valve port portion. The second valve seat cavity is located below the valve port portion. The valve port is capable of communicating with the first valve seat cavity and the second valve seat cavity. The first pipe connecting portion is fixedly connected to the outer wall portion located above the valve port portion. The second pipe connecting portion is fixedly connected to the outer wall portion located below the valve port portion. The inner diameter of the second valve seat cavity is greater than the inner diameter of the second pipe connecting portion.

First claim

The invention claimed is:

1. An electronic expansion valve, comprising:
a valve seat assembly;
a first pipe connecting portion; and
a second pipe connecting portion, wherein,
the valve seat assembly comprises an outer wall portion and a valve port portion provided with a valve port,
the electronic expansion valve comprises a first valve seat chamber and a second valve seat chamber, the first valve seat chamber is located above the valve port portion, and the second valve seat chamber is located below the valve port portion, the valve port is configured to communicate the first valve seat chamber with the second valve seat chamber, the first pipe connecting portion is fixedly connected to the outer wall portion located above the valve port portion, the second pipe connecting portion is fixedly connected to the outer wall portion located below the valve port portion, an inner diameter of the second valve seat chamber is greater than an inner diameter of the second pipe connecting portion, and the inner diameter of the valve port is less than an inner diameter of the second valve seat chamber,
wherein the electronic expansion valve further comprises: a magnetic rotor assembly, a screw rod valve needle assembly and a nut assembly,
wherein the screw rod valve needle assembly includes a screw rod, a valve needle, a sleeve portion, a spring and a support member, the screw rod is in floating connection with the valve needle through the sleeve portion, the sleeve portion is in cup shape with an open bottom on the bottom thereof, the valve needle passes through the opening and enters into the first valve seat chamber to be matched with the valve port for adjusting, the spring is provided in the sleeve portion, one end of the spring is supported to the sleeve portion, and the other end of the spring is supported to the support member coupled with the valve needle, so as the valve needle is able to move up and down within a certain stroke relative to the sleeve portion;
wherein the nut assembly is provided with a through hole in the axial direction thereof, the screw rod passes through the through hole and is threaded connected with the nut assembly, so that when the magnetic rotor assembly rotates, the screw rod linked with the magnetic rotor assembly makes an upward and downward movement relative to the nut assembly while rotating, thereby driving the valve needle to do the lifting movement.

2. The electronic expansion valve according to 1, wherein, the outer wall portion comprises a circumferential wall portion, and
the circumferential wall portion comprises a first circumferential wall portion, the first circumferential wall portion and the valve port portion are integrally formed or the first circumferential wall portion is fixedly connected with the valve port portion, the valve seat assembly is provided with a first port portion on the first circumferential wall portion, the first pipe connecting portion is fixedly connected to the valve seat assembly at the first port portion; and
the circumferential wall portion comprises a second circumferential wall portion, the outer wall portion comprises a bottom wall portion, the valve seat assembly is provided with a second port portion on the second circumferential wall portion or the bottom wall portion, and the second pipe connecting portion is fixedly connected to the valve seat assembly at the second port portion.

3. The electronic expansion valve according to claim 2 , wherein, the valve seat assembly comprises a first valve seat portion and a second valve seat portion, the first valve seat portion is fixedly connected to the second valve seat portion by welding; and
the first valve seat portion comprises the first circumferential wall portion and the valve port portion, the second valve seat portion comprises the second circumferential wall portion and the bottom wall portion, the first port portion is located on the first circumferential wall portion, the second port portion is located on the bottom wall portion, the first pipe connecting portion is fixedly connected to the first valve seat portion by welding, and the second pipe connecting portion is fixedly connected to the second valve seat portion by welding, at least most part of the second port portion is located below the second valve seat chamber, and the second port portion is opposite to the valve port portion.

4. The electronic expansion valve according to claim 1 , wherein, the valve seat assembly comprises a main valve seat and an end cover, the main valve seat is fixedly connected to the end cover by welding, the main valve seat comprises a main circumferential wall portion, the outer wall portion comprises the main circumferential wall portion and the end cover, the end cover comprises a bottom wall portion, the valve port portion and the main circumferential wall portion are integrally formed or the valve port portion is fixedly connected to the main circumferential wall portion, the first port portion is located on the main circumferential wall portion, at least most part of the first port portion is located above the valve port portion, the second port portion is located on the bottom wall portion, and the second port portion is located below the valve port portion.

5. The electronic expansion valve according to claim 1 , wherein, the valve seat assembly comprises the outer wall portion and the valve port portion, the outer wall portion is an integrated structure, and the outer wall portion is in interference fit with the valve port portion or the outer wall portion is fixed to the valve port portion by welding, the outer wall portion comprises a circumferential wall portion and a bottom wall portion, the first port portion is located on the circumferential wall portion, at least most part of the first port portion is located above the valve port portion, the second port portion is located on the bottom wall portion, and the second port portion is located below the valve port portion; and
an inner chamber of the first pipe connecting portion is in direct communication with the first valve seat chamber, and an inner chamber of the second pipe connecting portion is in direct communication with the second valve seat chamber.

6. The electronic expansion valve according to claim 3 , wherein, the valve port portion is located a middle region of the valve seat assembly in the axial direction, the bottom wall portion is opposite to the valve port portion, the second port portion is opposite to the valve port portion, a diameter of the valve port portion is less than the diameter of the second port portion, and the diameter of the second valve seat chamber is greater than the diameter of the second port portion.

7. The electronic expansion valve according to claim 2 , wherein, the valve seat assembly comprises a main valve seat and an end cover, the main valve seat is fixedly connected to the end cover by welding, the main valve seat comprises a main circumferential wall portion, the outer wall portion comprises the main circumferential wall portion and the end cover, the end cover comprises a bottom wall portion, the valve port portion and the main circumferential wall portion are integrally formed or the valve port portion is fixedly connected to the main circumferential wall portion, the first port portion is located on the main circumferential wall portion, at least most part of the first port portion is located above the valve port portion, the second port portion is located on the bottom wall portion, and the second port portion is located below the valve port portion.

8. The electronic expansion valve according to claim 4 , wherein, the valve port portion is located a middle region of the valve seat assembly in the axial direction, the bottom wall porti

Assignees

• Zhejiang Sanhua Intelligent Controls Co Ltd

Inventors

• He Weixin
• Chang Qing
• Yuan Ze
• Shen Zicheng

Classifications

• F25B41/35 Primary

  by rotary motors, e.g. by stepping motors · CPC title

• F25B2500/12

  Sound · CPC title

• F16K31/06

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

• Y02B30/70

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