Electrically operated valve

Abstract

An electrically operated valve comprises a sealed housing in which the bottom is fixed on a valve body provided with a valve chamber and a throttling hole; a step motor installed inside the sealed housing comprises a stator coil and an rotor in opposite configuration; a valve needle approaches to or leaves away from the throttling hole according to the driving of the step motor; the inner part of the sealed housing is provided with a stop mechanism for stopping the rotation of the rotor; the stopping mechanism limits the up and down movement of the valve needle so as to control the flow rate of the fluid passing in and out of the valve chamber; the sealed housing comprises a cylindrical wall part, a bent part, an arc part, and a cover-shaped shield component; the cover-shaped shield component comprises a short cylindrical wall part formed on the inner periphery surface of the head part connected through spot welding on the arc part; the cover-shaped shield component comprises a bent part and a top part which are integrally formed; the short cylindrical wall part, the bent part and the top part are respectively formed into the external periphery shapes of the short cylindrical wall part, the bent part, and the top part along the sealed housing; and simultaneously, the cover-shaped shield component is provided with the stop mechanism.

Description

technical field [0001] The invention relates to an electric valve, in particular to a valve suitable for carbon dioxide (CO 2 ) and other natural refrigerants in the refrigeration cycle to control the flow of refrigerant electric valve. Background technique [0002] In the refrigeration cycle, an electric valve used as a flow control valve includes a valve body, a valve core or a valve needle that is close to or away from a valve seat formed on the valve body, and a cylindrical casing (closed) fixed on the valve body. Type outer cover), and the rotor that is arranged in this outer cover, and the stator that is arranged on the outside of described airtight type outer cover and its rotor opposite configuration; Described rotor and stator constitute stepping motor, moreover, the Inside, there is a stop mechanism as a rotation stop mechanism of the rotor, and the stop mechanism limits the rotation range of the rotor and stops the vertical movement of the valve needle. [0003]...

AI Technical Summary

Problems solved by technology

[0022] Therefore, in Patent Document 6, in order to fix the guide support body on the airtight cover, the airtight cover must be machined to form the convex portion, and therefore, there is a problem that the process is cumbersome when performing the machining. problems, and there may be stress concentration phenomenon after the outer cover is machined, and it may rupture under pulse pressure, resulting in product failure

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