Screw machine expansion valve with valve seat convenient to replace

Abstract

The invention relates to a screw machine expansion valve with a valve seat convenient to replace, which defines a first flow section, a second flow section and a connecting port for connecting the first flow section and the second flow section, an actuating mechanism comprises a stepping motor and a driving shaft connected with the stepping motor, a valve actuating mechanism comprises a discharge piston connected with the driving shaft, and the discharge piston is connected with the valve seat. The valve body is provided with a first sealing sleeve, the valve moving mechanism further comprises a second sealing sleeve embedded in the first sealing sleeve, a sleeve is arranged in the second sealing sleeve and located on the periphery of the discharging piston, the discharging piston is provided with a head in the valve body, and opening and closing of the connector are achieved through movement of the head at the connector. The sleeve is arranged in the valve moving mechanism, free combination between the size of the valve seat and the size of the starting mechanism is achieved, valve seats of different sizes can be matched with the same valve moving mechanism, on one hand, the product development cost is reduced, on the other hand, when the valve seat is damaged, the valve seat can be directly replaced, and the valve seat does not need to be matched with the corresponding valve moving mechanism.

Description

technical field [0001] The invention relates to the technical field of expansion valves, in particular to a screw machine expansion valve which is convenient for valve seat replacement. Background technique [0002] The electronic expansion valve is a throttling element that can throttle the flow of refrigerant entering the refrigeration unit according to a preset program. In some occasions where the load changes drastically or the operating range is wide, traditional throttling elements (such as capillary tubes, thermal expansion valves, etc.) can no longer meet the requirements of comfort and energy saving. Electronic expansion valves combined with compressor variable capacity technology have been obtained. more and more widely used. As a new type of control element, the electronic expansion valve has become an important part of the intelligentization of the refrigeration system, and it is also an important means and guarantee for the real realization of the optimization ...

AI Technical Summary

Problems solved by technology

[0003] However, when the screw machine expansion valve in the prior art is in use, the matching between the valve seat and the valve actuator is all matched one by one. When the valve seat is broken, the corresponding valve actuator needs to be replaced, resulting in a high maintenance cost. High, so it is urgent to develop a screw machine expansion valve that is convenient for valve seat replacement to solve the problems in the prior art

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