Method for adjusting electronic expansion valve

Abstract

The invention provides a method for adjusting an electronic expansion valve. The method comprises the following steps: (a) acquiring superheat degree adjusting threshold F of a refrigerating system; (b) measuring the value of superheat degree SVn, wherein n is a natural number; and (c) determining the running mode of the electronic expansion valve according to the value of the superheat degree SVnmeasured in step (b); keeping the electronic expansion valve in current opening degree in case of SVn is not less than F-f and is less than F+f; decreasing the opening degree of the electronic expansion valve if the SVn is less than F-f; increasing the opening degree of the electronic expansion valve if the SVn is not less than F+f, wherein f is deviation value. According to the method, the system data can be detected through the control method when the system runs, and the opening degree is changed in real time so as to improve the system stability. Therefore, the system can be kept within asafe and reasonable working condition range all the time under the variation of the load and outer conditions, and meanwhile, the operation economy of the system under various working condition changing conditions can be improved; and the defect that the control method of an electronic expansion in the prior art is incomplete in case of the change of outside environment and the system cannot be kept in the optimal state all the time can be overcome.

Description

technical field [0001] The invention relates to the field of refrigeration system control, in particular to a method for adjusting an electronic expansion valve. Background technique [0002] In the refrigeration system, the evaporator, condenser, compressor and throttle valve are the four essential parts in the refrigeration system. The refrigerant is sucked into the compressor for adiabatic compression, and becomes a high-temperature and high-pressure gas. After passing through the condenser and the throttle valve, the temperature and pressure are reduced, and then enters the evaporator to take away the heat of the cooled object, and then flows back to the compressor after becoming a low-temperature and low-pressure gas. . [0003] The electronic expansion valve is a kind of throttling valve commonly used in the prior art. The electronic expansion valve is controlled by the controller, but how to ensure the performance index required by the process of the refrigeration sy...

AI Technical Summary

Problems solved by technology

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the control method of the electronic expansion valve in the prior art is not perfect when the external environment changes, and the system cannot be in the optimal state at all times, so as to provide an electronic expansion valve that can be used when the load and external conditions change. An electronic expansion valve adjustment method that keeps the system running within a safe and reasonable range of working conditions, and at the same time improves the operating economy of the system under various working conditions.

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