Thread transmission mechanism and electric valve containing thread transmission mechanism

Abstract

The invention discloses a thread transmission mechanism and an electric valve containing the thread transmission mechanism. An externally threaded component of the electric valve includes an externally threaded part and a mounting seat, the externally threaded part includes a stepped semi-cylindrical base and an externally threaded rod, the externally threaded rod is fixedly connected with the bottom of the base, the mounting seat and the base are in a stepped semi-cylindrical shape which is matched with each other; the mounting seat and the lower section of the base are matched to form a transmission part which is connected to a rotor of the electric valve, a semi-cylindrical part integrally formed with the externally threaded rod is formed on an axial plane part of the base, and a semi-circular groove matched with the semi-cylindrical part is formed on the mounting seat. The semi-cylindrical part is arranged and formed on the externally threaded part, the length of the semi-cylindrical part is controlled to be close to the length of an external thread, and position accuracy and strength of thread injection can be ensured. In addition, semi-cylindrical bosses and semi-cylindricalgrooves which are convex and concave fitted in the axial direction are formed on the mounting base and the externally threaded part, and coaxiality of the mounting of the externally threaded part anda threaded seat can be ensured.

Description

technical field [0001] The invention belongs to the technical field of refrigeration electric valves, in particular to a screw drive mechanism and an electric valve including the mechanism. Background technique [0002] The electric valve is mainly used in the refrigeration or heating system. By changing the flow area of ​​the valve port of the electric valve, it is linked with the frequency conversion compressor in the system to control the refrigerant pressure of the refrigeration or heating system. Existing electric valves are usually driven by stepping motors, and the threaded mechanism converts the rotational motion of the motor into linear motion, so that the tapered valve core elastically connected with the thread approaches or moves away from the valve port. In order to ensure the flow adjustment accuracy of the electric valve and the stability of the electric valve, the manufacturing accuracy of the thread structure is very critical, especially after the thread stru...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of difficult assembly and low thread precision existing in the existing electric valve thread transmission mechanism, the present invention aims to provide a thread transmission mechanism and an electric valve including the mechanism

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