Flow control valve

Abstract

The purpose of the present invention is to provide a flow control valve capable of maintaining air tightness and pressure resistance by suppressing, with a simple configuration, defects in a manufacturing process due to poor brazing such as edge collapse, which is a conventional problem. A valve main body (111) formed of a metal material and having a valve chamber (111A) in which a needle (121) for controlling the flow rate of a fluid is housed and a valve seat (112) in which the needle can approach or leave is formed; and a housing (151) joined to the valve main body and driving the needle, the housing (151) being provided to the valve main body. And two joints (101, 102) formed of a metal material different from that of the valve body and soldered to the valve body, wherein a groove (111d) is provided between the outer periphery of the valve body and the first port (111b) of the joint (101) and the housing-side end surface and / or the valve seat-side end surface of the valve body.

Description

technical field [0001] The present invention relates to a flow control valve comprising an electric valve and a solenoid valve for controlling the flow of fluid. Background technique [0002] Conventionally, flow control valves including electric valves and solenoid valves are known to control the flow of fluid. Such a flow rate control valve is used as an electric expansion valve in a heat pump heating system and a refrigeration system, and an electric valve described in Patent Document 1 is known. Below, use figure 1 (a) to figure 2 (b) Such a conventional electric valve will be described. [0003] figure 1 (a) is a front view showing a schematic structure of a conventional electric valve 10, figure 1 (b) means reverse configuration figure 1 (a) The front view of the process of brazing the valve main body 11 shown, figure 2 (a) means figure 1 The side view of the state after the brazing of the valve main body 11 shown in (b), figure 2 (b) means figure 2 (a) i...

AI Technical Summary

Problems solved by technology

like figure 2 As shown in (b), in such a case, in the subsequent welding process of welding the valve body 11 and the housing 12, the weld material 13WB that melts and falls hits the end surface of the valve body 11 that becomes the welding surface. , there will be situations where the valve body 11 and the housing 12 cannot be in normal contact

In this case, an inclination or a gap is generated between the valve body 11 and the housing 12, resulting in poor welding, and the welding material dissolves in the metal structure of the welded part, resulting in poor strength and damage to the inside of the electric valve. airtightness and pressure resistance

[0009] In addition, in the press-fitting process, the caulking process, etc., which are the subsequent processes, the reference plane as the contact surface with the tool deviates due to the sag, and it may not be fixed normally, which may cause defects in the subsequent manufacturing process. Case

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