Opening feedback electronic expansion valve and control system thereof

Abstract

The invention provides an opening feedback electronic expansion valve and a control system of the opening feedback electronic expansion valve. The opening feedback electronic expansion valve comprises a shell, an expansion valve rotor is installed in the shell, a valve needle is arranged on the expansion valve rotor, a rotating potentiometer is arranged in the shell, a potentiometer gear is arranged on the rotating potentiometer, an expansion valve gear is arranged on the expansion valve rotor, and the potentiometer gear and the expansion valve gear are mutually meshed. The control system of the opening feedback electronic expansion valve comprises the opening feedback electronic expansion valve which is connected with a detection and filter circuit module, the detection and filter circuit module is connected with a central control module, and the central control module is connected with a display circuit and sends control signals to the opening feedback electronic expansion valve. According to the opening feedback electronic expansion valve and the control system, the actual opening of the electronic expansion valve can be directly reflected, opening feedback signals are sent to a controller, and therefore the out-of-step fault and other faults can be conveniently found and solved, and closed loop control over the opening of the electronic expansion valve is achieved.

Description

technical field [0001] The invention relates to an electronic expansion valve used in a refrigeration system, in particular to an air conditioner electronic expansion valve capable of real opening feedback and closed-loop control. Background technique [0002] 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, sent 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 main body of the electronic expansion valve used in the refrigeration system is a stepper motor, and failures such as out-of-step may occur in its control. When the electronic expansion valve is out-of-step and other failures, if the feedback control system The pulse signal sent by the system is still normal. That is to sa...

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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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