An opening feedback electronic expansion valve and its control system

Abstract

The invention provides an opening feedback electronic expansion valve and its control system. The opening feedback electronic expansion valve includes a casing, and an expansion valve rotor is installed in the casing. A valve needle is arranged on the expansion valve rotor, and a rotary potentiometer is also arranged in the casing. The potentiometer gear is set on the rotary potentiometer, and the expansion valve gear is set on the expansion valve rotor, and the potentiometer gear and the expansion valve gear mesh with each other; the opening feedback electronic expansion valve control system includes the opening feedback electronic expansion valve, the opening The degree feedback electronic expansion valve is connected to the detection and filtering circuit module, the detection and filtering circuit module is connected to the central control module, the central control module is connected to the display circuit, and the central control module sends a control signal to the opening feedback electronic expansion valve; the invention can directly reflect the electronic expansion The actual opening of the valve, and the opening feedback signal is sent to the controller, which is convenient for finding and solving failures such as out of step, and realizes the closed-loop control of the opening of the electronic expansion valve.

Description

technical field [0001] The invention relates to an electronic expansion valve used in a refrigeration system, in particular to an air-conditioning electronic expansion valve capable of real opening feedback and closed-loop control. Background technique [0002] The electronic expansion valve is one of the four major components in the air conditioning system. Usually the control of the electronic expansion valve is one-way, that is, it is issued by the control system, and the actual opening of the electronic expansion valve cannot be fed back to the control system, so the control of the electronic expansion valve is open-loop, and its actual operation is not clear. The body of the electronic expansion valve used in the refrigeration system is a stepping motor, and failures such as out-of-step may occur in its control. When the electronic expansion valve has a failure such as out-of-step, if the pulse signal sent by the feedback control system is still normal, That is, if the...

AI Technical Summary

Problems solved by technology

[0008] The above-mentioned technical solutions are also difficult to accurately feed back the actual opening of the electronic expansion valve. Even if the opening of the expansion valve can be detected, the feedback signal cannot be output. As a control application

[0009] Therefore, none of the opening feedbacks in the prior art can truly reflect the real opening of the electronic expansion valve, so as to eliminate faults in time and maintain the stability of the system operation

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