Thread transmission type electronic expansion valve

Abstract

The invention relates to a thread transmission type electronic expansion valve, and belongs to valves. An existing electronic expansion valve is large in running noise, and abrasion or clamping of a magnetic steel sleeve is prone to occurrence; the thread transmission type electronic expansion valve is characterized in that a backward step end face leaning shoulder is arranged on the outer circle face of a front base sleeve, the opening end of a back base sleeve is in butt joint with the step end face leaning shoulder in a fixedly welding manner to form a straight-cylinder-shaped shell with two ends closed, a front section of a nut sleeve is inserted into an inner cavity wall of the front base sleeve, and an end face leaning shoulder on the inner cavity wall and an inward turning edge of the opening end of the front base sleeve are used for limiting and fixing; a valve is installed in a hollow inner cavity of a valve rod sleeve fixed to the magnetic steel sleeve in a penetrating manner, the back end of the valve extends out of the back end of the magnetic steel sleeve, and a spacer bush and a spring arranged outside the valve rod in a sleeving manner are used for back stroke limiting; and the valve rod sleeve is matched with inner threads in an axial through hole of the nut sleeve through outer threads to drive the valve rod to move, a buffer connecting piece connected with the front end of the valve rod is arranged on the front section of the axial through hole of the nut sleeve to conduct guide supporting on the valve rod, circumferential limiting protrusions and limiting leaning shoulders which are matched with each other are arranged for front stroke limiting, and the collision noise and friction are reduced.

Description

technical field

[0001] The invention belongs to the field of valves, and in particular relates to a screw drive electronic expansion valve. Background technique

[0002] The electronic expansion valve is a throttling valve used to control the flow of refrigerant medium in the refrigeration system. The traditional electronic expansion valve includes a valve body, a coil mechanism, an output pipe connected to the valve hole, and an input pipe connected to the side wall of the valve cavity. , the valve hole is arranged at the front end of the front seat cover, and the valve hole is blocked or opened by an axially moving valve stem. The valve stem of the existing electronic expansion valve is a long rod, and the maximum stroke of the valve stem is limited by the guide and limit mechanism that is paired in the circumferential direction. It is easy to shake when moving, and the magnetic steel fixed to the valve stem is easy to follow. Shaking, touching the shell will cause wear ...

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