Electrically-operated valve

Abstract

An electrical valve for adjusting fluid flow comprises a valve seat (12) provided with a valve chamber (121) and a valve plug seat (11) with a valve port (113) fixed on the valve seat; a valve needle-screw stem assembly comprises a screw stem (23) and a valve needle (21) drivable by the screw stem (23); a nut assembly comprises a nut (32) and a connecting plate (31), wherein the connecting plate is fixedly connected to the valve seat, the nut thread fits the screw stem, the nut is provided with a lower pilot segment (321) thereof, the valve needle is provided with a lower pilot segment (211), and the valve plug seat is provided with a first pilot segment (111) fitting the lower pilot segment of the nut and a second pilot segment (112) fitting the lower pilot of the valve needle. The electrical valve enables concentricity between the nut and the valve needle-screw stem assembly, and concentricity between the nut and the valve port of the valve plug seat to be easily ensured, so as to prevent the problems of the valve port not being sealed tightly or the valve port being worn eccentrically, such that the operational reliability of the electrical valve is increased.

Description

[0001] This application claims priority to the following patent applications, the entire contents of which are incorporated herein by reference: [0002] 1. On October 15, 2010, the Chinese patent application with the application number of 201010515234.1 and the invention name of "an electric valve" was submitted to the Chinese Patent Office; [0003] 2. On October 15, 2010, a Chinese patent application with the application number of 201010515238.X and the invention titled "electric valve and its stopper" was submitted to the Chinese Patent Office; [0004] 3. On July 1, 2011, a Chinese patent application was submitted to the Chinese Patent Office with the application number of 201110184918.2 and the invention titled "An electric valve device". technical field [0005] The present invention relates to the technical field of control valves, in particular to an electric valve for regulating fluid flow. Background technique [0006] In air conditioners, refrigerators, heat pum...

AI Technical Summary

Problems solved by technology

[0008] The patent document (JP-A-2010-25932) discloses an electric valve. The nut of the nut assembly is fixed in the guide sleeve, the guide sleeve is fixed on the valve seat, and the valve needle needs to be fixed in the valve port of the valve seat. Therefore, the coaxiality between the valve seat and the nut is highly required. The above-mentioned electric valve needs to be indirectly controlled through multiple assembly processes to ensure the coaxiality between the valve core seat and the nut, and the coaxiality between the valve seat and the nut is affected by the nut, guide Affected by the processing accuracy of sleeve, valve seat, valve needle and other parts, the coaxiality is not easy to guarantee. If the valve core seat and the nut are not in the same axis, it is easy to appear that the valve needle and the valve port are not in the same axis, which will cause the valve The sealing of the valve port is not tight or the valve port is eccentrically worn, so that the reliability of the electric valve action is low, and the service life of the electric valve will also be shortened.

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