End cover as well as main valve of four-way reversing valve and four-way reversing valve using same

Abstract

The invention discloses an end cover used for a main valve of a four-way reversing valve. The end cover is provided with a large-diameter segment and a small-diameter segment axially arranged in sequence, wherein the periphery of the large-diameter end cover is fixedly connected with a valve body; the end part of the small-diameter end cover is matched with a piston of the main valve to limit theworking position of the piston; and the large-diameter end cover is in a frustum shape with a larger external end and smaller internal end. The end cover is suitable for the valve body determined by the permissible range of the size of the internal diameters at both ends; after assembling, the peripheral surface of the large-diameter end of both end covers or the near large-diameter end is matched with the inner wall of the valve body so as to meet the position precision requirement therebetween and further improve the welding precision therebetween. On this basis, the invention further provides a main valve of a four-way reversing valve and a four-way reversing valve using the end cover.

Description

technical field [0001] The invention relates to a four-way reversing valve used in a refrigerant circulation system, in particular to an end cover, a main valve of the four-way reversing valve and a four-way reversing valve using the end cover. Background technique [0002] Existing four-way reversing valve is mainly made up of electromagnetic coil, pilot valve and main valve. During the control process, the direction of the main valve is realized through the joint action of the electromagnetic coil and the pilot valve to switch the flow direction of the refrigerant, so that the heat pump air conditioner can be switched between the two working states of cooling and heating. The purpose of cooling and heating in winter. [0003] The existing four-way reversing valve includes three main parts such as main valve, pilot valve and electromagnetic coil. The main valve has three ports: S port connected with the suction port of the compressor, E port connected with the indoor heat...

AI Technical Summary

Problems solved by technology

However, the existing valve body is made of stretched stainless steel plate, and most of the finished valve bodies have cylindricity errors, that is, the inner diameter of the valve body is large at one end and small at the other end; Problems with a large gap at one end and a tighter end at the other

In this way, during actual assembly, the valve body will often be stretched after the end cover is pressed into the small diameter end of the valve body, so that a gap fit is formed between the rear part of the end cover and the valve body; the matching gap between the end cover and the large diameter end of the valve body is relatively large , so it affects the position accuracy and welding quality between the two

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