US-12618476-B2 - Electronic expansion valve and refrigeration device

US12618476B2US 12618476 B2US12618476 B2US 12618476B2US-12618476-B2

Abstract

An electronic expansion valve and a refrigeration device are provided. The electronic expansion valve has a valve seat, a nut and a connection piece. The valve seat is provided with a valve cavity. One end of the nut is installed in the valve cavity. An outer wall of the nut is provided with an annular position part that extends from the outer wall. The position part is positioned to be in contact with a wall of the valve cavity. One end of the connection piece is fixedly connected to the nut. Another end of the connection piece is extended away from the nut and fixedly connected to an axial end surface of the valve seat.

Inventors

Longhua HUANG
Chao Chen
Mao YANG
Bo Jiang

Assignees

GUANGDONG WELLING MOTOR MANUFACTURING CO., LTD.

Dates

Publication Date: 20260505
Application Date: 20230602
Priority Date: 20201214

Claims (13)

1 . An electronic expansion valve comprising: a valve seat forming a valve cavity and comprising a wall; a nut at least partially disposed within the valve cavity, the nut comprising: an outer wall; and a position portion protruding from the outer wall and contacting the wall of the valve seat, the position portion comprising: a connection portion in interference fit with the wall of the valve seat; and a tapered guide portion connected to the connection portion with a decreasing diameter away from the connection portion; a balance channel that communicates two sides of the position portion in an axial direction; a connection piece forming a balance hole that is in communication with the balance channel and communicates two sides of the connection piece in the axial direction, the connection piece comprising: an inner end fixedly connected to the nut; and an outer end away from the nut that is fixedly connected to an axial end surface of the wall of the valve seat; and a housing comprising a housing axial end surface in contact with the axial end surface of the wall of the valve seat, wherein: a thickness of the wall of the valve seat is greater than a thickness of the housing at an intersection of the wall of the valve seat and the housing; an outer surface of the wall of the valve seat and an outer surface of the housing are flush; the outer end of the connection piece is fixedly connected to a portion of the axial end surface of the wall of the valve seat that is not connected to the housing; and an annular gap is formed between the outer end of the connection piece and an inner wall of the housing.
2 . The electronic expansion valve according to claim 1 , wherein: the connection piece is spaced apart from the position portion in the axial direction; the connection piece, the position portion, and the wall of the valve seat form a first cavity; and the balance channel and the balance hole communicate via the first cavity.
3 . The electronic expansion valve according to claim 1 , wherein the balance channel is formed by the position portion of the nut.
4 . The electronic expansion valve according to claim 1 , wherein the balance channel is formed by the wall of the valve seat.
5 . The electronic expansion valve according to claim 1 , wherein the connection piece is welded to the wall of the valve seat.
6 . The electronic expansion valve according to claim 1 , further comprising: a valve stem; a valve needle part connected to the valve stem; and a valve core seat provided on the valve seat, wherein: the nut further comprises: a thread section matched with the valve stem; and a fixing section connected to the thread section; the fixing section extends in a direction toward the valve core seat; the valve needle part is matched with the fixing section; and the connection piece and the position portion are disposed at an outer wall of the fixing section.
7 . The electronic expansion valve according to claim 6 , wherein: the fixing section of the nut comprises an installation portion and an extension portion; the installation portion is connected to the thread section; the connection piece and the position portion are disposed on an outer wall of the installation portion; one end of the extension portion is connected to the installation portion; and another end of the extension portion extends in the axial direction.
8 . The electronic expansion valve according to claim 7 , wherein an outer diameter of the extension portion is smaller than an outer diameter of the position portion.
9 . The electronic expansion valve according to claim 7 , wherein a gap is formed between the extension portion and the valve seat.
10 . The electronic expansion valve according to claim 7 , wherein the extension portion forms a diversion through hole.
11 . The electronic expansion valve according to claim 10 , wherein: the extension portion forms a plurality of diversion through holes; and the plurality of diversion through holes are provided around a periphery of the extension portion at intervals.
12 . The electronic expansion valve according to claim 7 , wherein the extension portion, the installation portion, and the position portion are integrally formed.
13 . A refrigeration device comprising the electronic expansion valve according to claim 1 .

Description

CROSS-REFERENCE TO RELATED APPLICATIONS The present application is a continuation application of PCT International Patent Application No. PCT/CN2021/120607, filed on Sep. 26, 2021, which claims priority to and benefits of Chinese Patent Application No. 202011483239.0, filed on Dec. 14, 2020, the entire contents of each of which are incorporated herein by reference for all purposes. No new matter has been introduced. FIELD The present application relates to the field of fluid control, and in particular, to an electronic expansion valve and a refrigeration device. BACKGROUND In air conditioners, refrigerators, heat pump water heaters and various refrigeration and heating equipment, electronic expansion valves are usually used to regulate the flow of fluid. In the related art, an electronic expansion valve usually includes a valve seat assembly, a nut assembly, and a valve needle assembly. The valve seat assembly is provided with a valve port and moves relative to the nut assembly, so as to drive the valve needle to open or close the valve port, thereby adjusting the flow. In the prior art, the electronic expansion valve is easy to be stuck when the components in the electronic expansion valve are matched with each other, which affects the working performance of the electronic expansion valve. SUMMARY The main purpose of the present application is to provide an electronic expansion valve, aiming at solving the problem in the related art that the electronic expansion valve is easy to be stuck. In order to achieve at least the above purpose, the present application provides an electronic expansion valve including a valve seat, a nut and a connection piece. The valve seat is provided with a valve cavity. One end of the nut is provided in the valve cavity, an outer wall of the nut is protruded is protruded with an annular position part, and the position part is positioned in contact with a wall of the valve cavity. One end of the connection piece is fixedly connected to the nut, and another end of the connection piece is extended away from the nut and is fixedly connected to an axial end surface of the valve cavity. In an embodiment of the present application, the position part includes a cylindrical connection section in interference fit with an inner wall of the valve seat. In an embodiment of the present application, the position part further includes a guide section connected to the connection section, the guide section is provided at a side of the connection section away from the connection piece, and an outer diameter of the guide section is less than an outer diameter of the connection section. In an embodiment of the present application, the outer diameter of the guide section is gradually decreased from an end connected to the connection section toward an end away from the connection section. In an embodiment of the present application, a balance channel is provided between the position part and the valve seat, and the balance channel is configured to communicate two sides of the position part in an axial direction. In an embodiment of the present application, the connection piece is provided with a balance hole, the balance hole is configured to communicate two sides of the connection piece in the axial direction, and the balance hole is communicated with the balance channel. In an embodiment of the present application, the connection piece is spaced apart from the position part, the connection piece, the position part and the valve seat are enclosed to form a first cavity, and both the balance channel and the balance hole are communicated with the first cavity. In an embodiment of the present application, the balance channel is provided at the position part. In an embodiment of the present application, the balance channel is provided on the valve seat. In an embodiment of the present application, the connection piece is welded to the valve seat. In an embodiment of the present application, the electronic expansion valve further includes a valve stem; a valve needle part connected to the valve stem; and a valve core seat provided on the valve seat. The nut includes a thread section matched with the valve stem, and a fixing section connected to the thread section, the fixing section is extended in a direction towards the valve core seat, and the valve needle part is in a guide match with the fixing section, and both the connection piece and the position part are provided at an outer wall of the fixing section. In an embodiment of the present application, the fixing section includes an installation part connected to the thread section, and an extension part, both the connection piece and the position part are provided on an outer wall of the installation part, one end of the extension part is connected to the installation part, and another end of the extension part is extended towards an axial direction of the valve core seat. In an embodiment of the present application, an outer wall of the extension part