Manufacturing method of valve seat assembly

Abstract

The invention discloses a manufacturing method of a valve seat assembly. An electronic expansion valve seat (2) and a cover cap (3) are assembled together to form the valve seat assembly. The manufacturing method of the valve seat assembly comprises the following steps that: 11) the valve seat (2) and the cover cap (3) are welded by melting by a base material to be positioned; and 12) a junction surface of the valve seat (2) and the cover cap (3) is sealed by brazing. Further, in the step 12), a first connecting tube (51) and a second connecting tube (52) of the electronic expansion valve are brazed in a first interface hole (26) and a second interface hole (27) of the valve seat (2). According to the manufacturing method, when the valve seat (2) and the cover cap (3) are placed in a furnace to be sealed by brazing, the pre-connecting and positioning of the valve seat (2) and the cover cap (3) do not loosen, thereby the reliability of the pre-positioning of the valve seat (2) and the cover cap (3) is improved.

Description

technical field [0001] The invention relates to the technical field of electronic expansion valves, in particular to a method for manufacturing a valve seat assembly of an electronic expansion valve. Background technique [0002] In refrigeration automatic control components, such as electronic expansion valves, the connection between the valve seat and the shell is very important. It is necessary to ensure the coaxiality of the two and the airtightness of the connection between the two. In the prior art, the connection between the valve seat and the shell generally uses a cover as an intermediate transition method. In this connection method, the connection between the cover and the valve seat is generally assembled by gap riveting and then brazed in the furnace to reliably connect the two. It is difficult to ensure the coaxiality of the two. On the other hand, the solder will penetrate into the gap between the cover and the valve seat during brazing, which will cause the p...

AI Technical Summary

Problems solved by technology

There are following deficiencies in this connection method: a) The riveting structure between the valve seat 2' and the cover 3' needs to be provided with a specific flange 2'1 on the valve seat 2', and the part structure needs to be specially designed, resulting in The structure is complex, the processing efficiency is low, and the cost is high; b) When the flange 2'1 is riveted with the cover 3', it is difficult to position the valve seat 2' and the cover 3'. After riveting, the valve seat 2' and the cover The coaxiality of the cover 3' is difficult to be precisely controlled; c) when the valve seat 2' and the cover 3' are placed in a furnace for brazing, the gap between the flange 2'1 of the valve seat 2' and the cover 3' The riveting structure between the two will cause looseness between the flanging 2'1 and the cover 3' due to the different expansion coefficients of the materials and the change of the stress between the two, resulting in low reliability of the riveting positioning, thus affecting the valve seat 2 ' and the coaxiality between the cover 3'

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