Electronic expansion valve and valve seat assembly thereof, and machining method of valve seat assembly

Abstract

The invention provides an electronic expansion valve and a valve seat assembly thereof, and a machining method of the valve seat assembly. By adoption of the machining method, the welding strength can be improved, the welding defects such as a lack of welding, weld porosity and welding leakage in the welding process can be effectively reduced, and the welding quality can be enhanced. The valve seat assembly comprises a valve seat, a coil fixing frame and a sleeve, wherein the coil fixing frame is fixedly connected to one end surface of the sleeve through spot welding and sealed by adoption of braze welding so as to form a sleeve assembly; and the end, where the coil fixing frame is welded, of the sleeve assembly is welded with the valve seat. The machining method comprises the following steps: fixedly connecting the coil fixing frame with the sleeve through spot welding and carrying out sealing by adoption of braze welding, so as to form the sleeve assembly; and welding the end, where the coil fixing frame is welded, of the sleeve assembly with the valve seat, so as to form a valve seat assembly. The machining method has the advantages that as the coil fixing frame is fixedly connected with the sleeve through spot welding and sealed by adoption of braze welding so as to form a sleeve assembly, the solder penetration trajectory during the welding between the sleeve assembly and the valve seat can be shortened, and then the welding quality can be improved.

Description

technical field [0001] The invention relates to the technical field of electronic expansion valves, in particular to an electronic expansion valve, a valve seat assembly thereof, and a processing method for the valve seat assembly. Background technique [0002] Electronic expansion valves are mainly used in frequency conversion air conditioning systems. The electronic controller sends pulse signals to the coil to control the rotation of the rotor parts. Through the transmission of the screw and the nut, the rotational motion of the rotor parts is converted into the linear movement of the valve needle, thereby Adjust the flow area of ​​the valve port, adjust the flow of refrigerant, and realize the automatic adjustment of refrigerant flow, so that the air conditioning system can always operate under the best working condition. [0003] Please refer to figure 1 and figure 2 , figure 1 It is a partial cross-sectional view of an electronic expansion valve in the prior art wh...

AI Technical Summary

Problems solved by technology

[0006] Because the valve seat 1' and the coil fixing frame 2' are press-fitted with interference fit, the pressure deviation is prone to fall off, which directly affects the subsequent welding, resulting in false welding pores during welding and reducing the welding strength;

[0007] When the first assembly is flame-brazed with the casing 3', welding needs to be carried out on the connection surfaces of any two of the valve seat 1', the casing 3' and the coil fixing frame 2', and the penetration path of the solder is relatively long. It is easy to produce welding defects in the weld, resulting in poor welding, and more solder filling, higher cost

[0008] The gap between the bonding surface of the coil fixing frame 2' and the casing 3' is not easy to ensure, and defects such as air holes are likely to occur between the two, and poor leakage is likely to occur at this part during subsequent use

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