a valve

Abstract

The invention provides a valve, which can give consideration to both connecting air impermeability and strength of a shell and a valve seat, is simple in structure and easy to produce and manufacture,and has a favorable use performance. The valve comprises the valve seat, a cylindrical shell welded with the valve seat, and a valve rod arranged in the shell. A combining part of the valve seat andthe shell adopts continuous welding to form a first weld joint; one side, far away from the valve seat, in an axial direction of the combining part of the valve seat and the shell adopts intermittentwelding to form a second weld joint intermittent in a circumferential direction; and a welding energy adopted by the second weld joint is larger than a welding energy adopted by the first weld joint.According to the valve provided by the invention, the two weld joints are formed through different welding processes, so that the connecting air impermeability and the strength are ensured, both connecting air impermeability and strength are further considered, a performance of the valve cannot be affected, the shell and the valve seat with specific structures are not needed to be adopted, and thevalve is easy to apply in a large range.

Description

technical field [0001] The invention relates to the technical field of refrigeration systems, in particular to a valve. Background technique [0002] In the refrigeration system, such as the supercritical vapor compression refrigeration device of CO2 refrigerant, because it is used in a supercritical state, the refrigerant pressure is higher than that of ordinary refrigerants, and high-pressure resistant electronic expansion valves are required. In order to ensure its high compressive strength, the shell and valve seat must be made of high-strength materials, and must have a wall thickness equivalent to the design pressure. At the same time, the joint between the shell and the valve seat requires high strength and high airtightness. [0003] Electronic expansion valves used in general refrigerant refrigeration devices do not require high pressure resistance. The wall thickness of the shell and valve seat can be designed to be relatively thin, and sufficient airtight bonding ...

AI Technical Summary

Problems solved by technology

[0009] In the first solution, the shell 1' is thickened as a whole, such as figure 1 , since the magnetic rotor 3' is installed inside the housing 1', and the driving coil 4' is installed outside the housing 1', if the thickness of the housing 1' is thicker, the distance between the magnetic rotor 3' and the driving coil 4' will directly increase, leading to a significant reduction in its driving force and a decline in work performance

[0010] In the second solution, only thicken the thickness of the joint position of the shell 1' and the valve seat 2', although this method can solve the problem of the distance between the magnetic rotor 3' and the driving coil 4', as figure 2 , but due to the uneven wall thickness of the shell 1' or the valve seat 2', this requires extremely high processing methods for the parts, and the low efficiency brought about by the difficult processing methods greatly increases the production cost. Meet mass production requirements

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