Electronic expansion valve

Patent metadata

Field	Value
Publication number	US-9689595-B2
Application number	US-201214399502-A
Country	US
Kind code	B2
Filing date	Aug 10, 2012
Priority date	May 18, 2012
Publication date	Jun 27, 2017
Grant date	Jun 27, 2017

Abstract

An electronic expansion valve is provided, the valve needle component thereof is provided with an axial mounting hole, the screw rod position limiting portion is mounted at the bottom end of the screw rod and extends into the axial mounting hole, and the valve needle position limiting portion is mounted at an open end of the axial mounting hole; and a distance between the bottom end of the screw rod and a bottom wall of the axial mounting hole forms the predetermined buffer distance. When the refrigerant flows reversely, the structural design of the electronic expansion valve may, on one hand, simplify the control procedure, and on the other hand, avoid the problem that a screw rod is stuck because a valve needle component is not removed in time.

First claim

The invention claimed is:

1. An electronic expansion valve, comprising a valve seat, a vertical connecting pipe and a transverse connecting pipe, the valve seat being provided with a main valve cavity; wherein the electronic expansion valve further comprises a main valve port in communication with the vertical connecting pipe and a valve core seat configured to open and close the main valve port, and the valve core seat is provided with a valve core valve port which allows a communication with the vertical connecting pipe; and the electronic expansion valve further comprises a valve needle component configured to open and close the valve core valve port, and a drive component configured to drive the valve needle component to reciprocate, and the drive component comprises a screw rod connected to the valve needle component, and a nut which cooperates with the screw rod by screw threads;
in a case that a refrigerant flows forward, the valve core seat closes the main valve port, and the refrigerant flows to the vertical connecting pipe via the valve core valve port, and the valve needle component is driven by the drive component to regulate an opening of the valve core valve port;
in a case that the refrigerant flows reversely, the valve core seat moves upward to open the main valve port, the valve needle component closes the valve core valve port, and the refrigerant flows to the transverse connecting pipe via the main valve port; and
wherein a screw rod position limiting portion is mounted at a bottom end of the screw rod, and the valve needle component is provided with a valve needle position limiting portion configured to retain the screw rod position limiting portion; and an elastic component which is compressed is further provided between the screw rod and the valve needle component; and
the screw rod and the valve needle component are movable with respect to each other in a predetermined buffer distance, and in a case that the refrigerant flows reversely, the valve core seat moves upward to push the valve needle component to move with respect to the screw rod, to allow the valve core seat to open the main valve port; and
wherein a sleeve is fixed in the main valve cavity, and the valve core seat is axially movably arranged in the sleeve, and a lower portion of the valve needle component extends into the sleeve to open and close the valve core valve port; and
a circumferential side wall of the sleeve is provided with a first communicating hole close to the main valve port and a second communicating hole away from the main valve port; in a case that the refrigerant flows forwards, the valve core seat closes the main valve port, and the communication between the first communicating hole and the main valve port is disconnected, and meanwhile a sleeve upper cavity comes in communication with the main valve cavity through the second communicating hole; and in a case that the refrigerant flows reversely, the valve core seat moves upward to open the main valve port, and the main valve port comes in communication with the main valve cavity through the first communicating hole.

2. The electronic expansion valve according to claim 1 , wherein the predetermined buffer distance ranges from 1 mm to 5 mm.

3. The electronic expansion valve according to claim 1 , wherein the valve needle component is provided with an axial mounting hole, the screw rod position limiting portion extends into the axial mounting hole, and the valve needle position limiting portion is mounted at an open end of the axial mounting hole; and
a distance between the bottom end of the screw rod and a bottom wall of the axial mounting hole forms the predetermined buffer distance.

4. The electronic expansion valve according to claim 3 , wherein the predetermined buffer distance ranges from 1 mm to 5 mm.

5. The electronic expansion valve according to claim 3 , wherein an outer wall of the valve needle component is provided with a valve needle stepped portion, the elastic component is sleeved on the outer wall of the valve needle component and has a lower end supported on the valve needle stepped portion; and
a movable position limiting plate is sleeved on the screw rod at a portion outside the axial mounting hole, and when moving upward to an upper limit position, the position limiting plate abuts against a screw rod stepped portion of the screw rod; and an upper end of the elastic component abuts against the position limiting plate.

6. The electronic expansion valve according to claim 5 , wherein the predetermined buffer distance ranges from 1 mm to 5 mm.

7. The electronic expansion valve according to claim 5 , wherein the valve needle position limiting portion comprises a cylindrical guide portion, a top end of the cylindrical guide portion is provided with a bent portion which is bent outwards, and the bent portion abuts against a top-end wall of the axial mounting hole; and the bottom end of the screw rod is guided to pass through the cylindrical guide portion, and a bottom wall of the cylindrical guide portion is configured to retain the screw rod position limiting portion.

8. The electronic expansion valve according to claim 7 , wherein the predetermined buffer distance ranges from 1 mm to 5 mm.

9. The electronic expansion valve according to claim 3 , wherein the elastic component is arranged inside the axial mounting hole, and has an upper end abutting against the screw rod position limiting portion, and a lower end supported on the bottom wall of the axial mounting hole.

10. The electronic expansion valve according to claim 9 , wherein the predetermined buffer distance ranges from 1 mm to 5 mm.

11. The electronic expansion valve according to claim 9 , wherein the valve needle position limiting portion is a retaining block fixedly arranged on an inner wall of the axial mounting hole at the open end.

12. The electronic expansion valve according to claim 11 , wherein the predetermined buffer distance ranges from 1 mm to 5 mm.

13. The electronic expansion valve according to claim 1 , wherein when the valve core seat moves upward to open the main valve port, the valve needle component closes the valve core valve port, and the valve core seat closes the second communicating hole at the same time to disconnect the communication between the sleeve upper cavity and the main valve cavity.

14. The electronic expansion valve according to claim 1 , wherein a lower end of the sleeve is supported by the valve seat, and the lower end of the sleeve surrounds the main valve port.

15. The electronic expansion valve according to claim 14 , wherein the valve seat is provided with a vertical connecting port for mounting the vertical connecting pipe, and the lower end of the sleeve extends into the vertical connecting port and is supported by the vertical connecting port; and an inner wall of the lower end of the sleeve forms a main valve hole, and the main valve port is formed by an aperture at an upper portion of the main valve hole.

Assignees

• Zhan Caiyi
• Zhejiang Sanhua Intelligent Controls Co Ltd

Inventors

• Zhan Caiyi

Classifications

• F25B2341/065

  Mechanical Engineering · mapped topic

• F25B2341/061

  Mechanical Engineering · mapped topic

• Y02B30/72

  Cross-Sectional Technologies · mapped topic

• F16K3/265 Primary

  with a sleeve sliding in the direction of the flow line · CPC title

• F16K11/10

  with two or more closure members not moving as a unit · CPC title