Expansion valve and diaphragm support structure thereof

Abstract

The invention discloses a diaphragm support structure of an expansion valve, which comprises a support body and a flexible support plate, wherein the flexible support plate is mounted on the upper end surface of the support body, and the peripheral edge of the flexible support plate extends out of the upper end surface of the support body along the radial direction for facilitating the flexible deformation of the flexible support plate. The diaphragm support structure can simultaneously ensure the long service life of a diaphragm and high stability and high precision of the expansion valve. The invention further discloses the expansion valve with the diaphragm support structure.

Description

technical field [0001] The present invention relates to a membrane support structure for an expansion valve and an expansion valve with such a support structure. Background technique [0002] In air conditioning and refrigeration systems, the expansion valve is used to control the amount of refrigerant flowing into the evaporator, so that the amount of refrigerant flowing into the evaporator matches the load of the evaporator, so that the refrigerant can be fully utilized to achieve cooling or heating. [0003] The expansion valve includes one or several diaphragms. The pressure of the filling medium, the pressure of the system refrigerant medium, and the spring force act on the diaphragm at the same time. The relationship between the three forces determines the degree of bending of the diaphragm, and the bending change of the diaphragm is transmitted To the spool, causing the change of the opening degree of the spool, so as to achieve the purpose of controlling the refriger...

AI Technical Summary

Problems solved by technology

There are two main factors that affect the life of the diaphragm: the higher the hardness and strength of the diaphragm, the better the life of the diaphragm, but too high hardness of the diaphragm will reduce the stability and accuracy of the expansion valve

[0006] In addition, debris generated during the production and processing of the valve body and / or transfer seat may enter the lower part of the diaphragm, and under the action of high-pressure air or liquid flow, damage the diaphragm, which is also an important factor affecting the life of the diaphragm

[0007] Moreover, the transmission seat of the traditional expansion valve is positioned by the valve body in the radial direction, so it needs to be in contact with the valve body, so when the transmission seat moves up and down with the valve core, the transmission seat rubs against the valve body, thereby reducing the life of the expansion valve

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