Electronic expansion valve with precision controlled through flow

Abstract

The invention discloses an electronic expansion valve with precision controlled through flow. The electronic expansion valve with the precision controlled through the flow comprises a valve base and a valve rod; a through groove which is through in an up-down manner is formed in the valve base; a matched bearing pedestal is inserted into the through groove and comprises a base body in which a penetrating through hole is formed; the through hole is matched with the valve rod; an internal thread segment is formed on the middle portion of the inner wall of the through hole; a matched straight pipe is welded to the bottom end of the through groove; a side face hole communicated with the through groove is formed in the outer wall of the valve base; a matched bent pipe is welded to the side face hole; an isolation sleeve is welded to the outer wall of the valve base; and a magnetic rotor is arranged outside the upper end of the valve rod. The electronic expansion valve with the precision controlled through the flow is characterized in that a second ring groove and a rectangular valve port are formed in the outer wall of a lower end port of the base body. The electronic expansion valve with the precision controlled through the flow can overcome the defects in the prior art, can eliminate the lateral pressure generated by gas borne by the valve rod, and can also make the flow control precision improved, control and adjustment of a system are facilitated, and meanwhile cost is reduced so that the market requirement can be met.

Description

technical field [0001] The invention relates to an electronic expansion valve with flow control accuracy. Background technique [0002] At present, there are many types of electronic expansion valves at home and abroad, with different structural features, but their throttling structures are similar, mainly the cone valve structure. Because of this cone valve structure, the linearity of the flow characteristics of the electronic expansion valve is not ideal, that is, under a certain condition (a certain pressure difference), the flow and the opening are not proportional, but in a curvilinear relationship. , close to a quadratic curve. This quadratic flow characteristic is not conducive to the precise control of the flow, because the change of the flow is not the same for the same amount of opening, so the control is very difficult, and the flow cannot be precisely controlled. Based on this, in order to improve the flow characteristics of numerical control flow, it is necess...

AI Technical Summary

Problems solved by technology

Because of this cone valve structure, the linearity of the flow characteristics of the electronic expansion valve is not ideal, that is, under a certain condition (a certain pressure difference), the flow and the opening are not proportional, but in a curvilinear relationship. , close to the quadratic curve

This quadratic flow characteristic is not conducive to the precise control of the flow, because the change of the flow is not the same for changing the same amount of opening, so the control is very difficult, and the flow cannot be precisely controlled

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