Electronic expansion valve and manufacturing method thereof

Abstract

The invention discloses an electronic expansion valve and a manufacturing method thereof. The electronic expansion valve comprises a shell component and a valve seat assembly. The valve seat assembly comprises a first connecting pipe and a second connecting pipe which are located on the same straight line. A main valve cavity is formed by the valve seat assembly, an included angle of the acute angle is formed by the main valve cavity and the first connecting pipe, the valve seat assembly is of an integral structure and is fixedly connected with the shell component through welding, and the preset distance is reserved between the radial extending line of the welding position of the valve seat assembly and the shell component and the first connecting pipe. According to the electronic expansion valve, due to the fact that the preset distance is reserved between the radial extending line of the welding position and the first connecting pipe, when a valve body rotates relatively to carry out welding, the welding can be smoothly carried out without the obstruction of the first connecting pipe, and the integrated valve body is formed. Compared with a thread connecting mode in the background technology, the electronic expansion valve is of an integral structure, and the leakage rate of products can be obviously reduced; meanwhile, the thickness of materials does not need to be increased, the quality of the materials does not need to be improved, and the production cost of the products can be effectively controlled.

Description

Technical field [0001] The invention relates to the technical field of valve bodies, in particular to an electronic expansion valve and a manufacturing method thereof. Background technique [0002] Please refer to figure 1 , figure 1 It is a schematic diagram of a typical electronic expansion valve. [0003] The electronic expansion valve includes a valve seat assembly, a housing member 64, and a valve stem assembly 130. The valve seat assembly includes a valve seat 24 and a cover 60. The lower end of the valve seat 24 is provided with a first interface 18 and a second interface 16 opposite to each other to connect the first connection pipe 18a and the second connection pipe 16a, the first connection pipe 18a and the second connection pipe 16a is in the same straight line. The valve seat 24 forms a main valve cavity, and the main valve cavity and the first connecting pipe 18a have an acute angle, that is, the valve seat 24 is in a "Bu" shape. [0004] The motor 70 of the electroni...

AI Technical Summary

Problems solved by technology

In the mass assembly process, reliable sealing cannot be guaranteed, and the defect rate of external leakage is high

Moreover, due to the transportation turnover process, vibration during use, and corrosion and oxidation, the leakage at the threaded connection will increase sharply with the increase in service life

[0007] Second, using threaded connection, in order to ensure the strength of the connection part, the design thickness and weight of the material must be increased, resulting in higher product cost

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