Electric valve

Abstract

The invention provides an electric valve, which can reduce the sliding friction resistance near the compression coil spring as much as possible when the valve is opened and closed even when the compression coil spring is eccentric or the valve port is deviated. The lower winding end of the compression coil spring (24) is locked by a spring support member (26). Between the spring support member (26) and the spool (25), there are two positions with the spring support member 26 and the spring support member (26). The spool 25 is a ball (40) that makes point contact, and is provided with a centering recess (26c) that is substantially composed of curved surfaces such as a spherical surface, an ellipsoid, and a conical surface. The deepest part of the centering recess is located at the spring support The lower surface of the member (26) is approximately central. The sliding frictional resistance can be reduced by the functions of the centering recess (26c) and the ball (40).

Description

technical field [0001] The invention relates to an electric valve installed in a heat pump refrigeration and heating system, etc., and in particular to an electric valve which uses the rotation of the rotor and uses screw feed to make the valve core and the valve seat contact and separate. Background technique [0002] As such an electric valve, there is an electric valve having: a valve shaft with a valve core provided at its lower end; a valve body provided with a guide rod having a cylindrical portion inserted into the valve shaft; The valve seat is separated from the valve core; the casing is engaged with the valve body; and the valve shaft lifting drive mechanism includes a rotor integrated with the valve shaft arranged in the casing, and is used to rotate and drive the rotor. The stator arranged on the outer periphery of the housing, the internal thread portion provided on the side of the guide rod, and the external thread portion provided on the side of the valve shaf...

AI Technical Summary

Problems solved by technology

[0012] However, the processing accuracy of the valve body assembled in this way is lower than that of the cutting workpiece. In addition, since the stress during the stamping process is released due to the heat generated when the parts are joined, it has disadvantages such as easy deformation. The center line of the valve port) is prone to deviation or inclination relative to the common axis of rotation of the rotor, valve shaft and valve frame

In this way, if the center line of the valve seat (the valve port provided on it) deviates or inclines relative to the rotation axis (hereinafter referred to as the axis deviation of the valve port, etc.), the valve core adapts to the position when the valve is opened and closed. Inserting and disengaging at the valve port (or valve seat), the valve core is also prone to misalignment or inclination with respect to the rotation axis, and then there is the eccentricity caused by the compression coil spring, and the compression coil spring near the valve opening and closing The problem of increased sliding frictional resistance

[0013] This kind of problem is likely to occur especially when the setting load of the compression coil spring is increased with the increase of the diameter of the valve port (increased flow rate).

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