Electronic expansion valve

Abstract

The invention provides an electronic expansion valve. The electronic expansion valve comprises a valve seat, a valve port seat, a nut assembly and a valve needle, the valve port seat is fixedly arranged on the valve seat, a guide sleeve is arranged between the valve seat and the nut assembly, and the valve needle capable of conducting reciprocating motion in the axial direction of the guide sleeve is arranged in the guide sleeve; and the valve port seat is concentrically connected with the guide sleeve in a sleeved mode, a first flow channel for communicating the valve cavity of the valve seat with the valve port of the valve port seat is formed in one end, close to the guide sleeve, of the valve port seat in the radial direction, and the matching length of the valve port seat and the guide sleeve is longer than the height from the bottom of the first flow channel of the valve port seat to a bottom axial stop face which is located outside the valve port seat and corresponds to the guide sleeve. According to the electronic expansion valve, the problem that, in the prior art, a valve seat does not conduct sufficient axial positioning on a guide sleeve, therefore the phenomenon of deflection of the guide sleeve is prone to happening, and thus the structural accuracy of the electronic expansion valve is affected can be solved.

Description

technical field [0001] The invention relates to an electronic expansion valve, in particular to an electronic expansion valve used in refrigeration systems such as air conditioners and refrigerators. Background technique [0002] The electronic expansion valve is an important part in the refrigeration system, which mainly plays the role of throttling and reducing pressure and regulating flow. The existing electronic expansion valve includes a valve body, a nut, and a valve needle assembly threadedly engaged with the nut. A driving device is used to drive the valve needle assembly to rotate while generating axial movement to adjust the opening of the valve port to achieve flow control. [0003] The invention patent with the publication number CN102454818A and the name "An Electric Valve" discloses an electronic expansion valve with the following structure: valve seat, valve core seat, valve needle screw assembly, nut, wherein the valve needle screw assembly is installed on th...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide an electronic expansion valve to solve the problem that the axial positioning of the valve seat to the guide sleeve is insufficient in the prior art, and the deflection of the guide sleeve is prone to occur, which affects the structural accuracy of the electronic expansion valve.

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