Control Method of Electronic Expansion Valve for Sudden Change of Load in Air-conditioning Indoor

Abstract

The invention provides a control method for an electronic expansion valve during sudden indoor load change of an air conditioner. The control method comprises the steps that preset frequency variation and preset opening of the electronic expansion valve are set, and the relationship between the expansion valve opening of the air conditioner and the compressor frequency of the air conditioner is set; the compressor frequency of the air conditioner is measured in real time; if the variation of the compressor frequency of the air conditioner is greater than the preset frequency variation, the compressor opening is adjusted to the preset opening of the electronic expansion valve; and the real-time superheat degree of the air conditioner is measured, and the action time cycle of the expansion valve is determined according to the real-time superheat degree. According to the control method, by setting the preset opening of the electronic expansion valve, when sudden load change happens, the compressor frequency and the opening of the electronic expansion valve are changed simultaneously, so that the risk of overheating or even halting caused by circulation volume insufficiency caused by sudden change of revolutions of the compressor can be effectively avoided, so that air outlet performance is ensured, and the compressor is also protected.

Description

technical field [0001] The invention belongs to the field of air-conditioning equipment adjustment, and in particular relates to an electronic expansion valve control method for sudden load changes in an air-conditioning room. Background technique [0002] During the operation of the compressor, the action time period of the expansion valve (the judgment of the actual superheat and the target superheat) is divided into several grades, ranging from a few seconds to tens of seconds, and at the moment when the indoor load changes suddenly, the compressor immediately According to the new load operation, the action cycle of the expansion valve is still in accordance with the time period before the load change. After the time period has passed, the corresponding action will be given according to the relationship between the actual superheat degree and the target superheat degree. [0003] When the indoor load changes suddenly, especially when the low-frequency stable operation is ...

AI Technical Summary

Problems solved by technology

[0003] When the indoor load changes suddenly, especially when the low-frequency stable operation is switched to high-frequency operation, there is a large gap between the operation time period of the compressor and the operation time period of the expansion valve, which will cause the refrigerant circulation to fail to keep up. Makes wrong judgments in inflation control

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