Control method of air-conditioner expansion valve, control device and air-conditioner

Abstract

The invention discloses a control method of an air-conditioner expansion valve, a control device and an air-conditioner. The method comprises the steps of conducting operation of air conditioning refrigeration, and obtaining a current indoor environment temperature, a current return air deviation of degree of superheat, and a current deviation variation amount of the degree of superheat; executing the following valve adjusting procedures if the current return air deviation of degree of superheat and the current deviation variation amount of the degree of superheat satisfy the conditions of degree of superheat and satisfy the condition of the indoor environment temperature at the same time, wherein the procedures specifically comprise the step of magnifying the current return air deviation of degree of superheat to be larger than zero and using the current return air deviation of degree of superheat as an actual return air deviation of degree of superheat, obtaining an actual deviation variation amount of the degree of superheat according to the actual return air deviation of degree of superheat, and then adjusting the opening degree of the expansion valve according to the actual return air deviation of degree of superheat and the actual return air deviation variation amount of the degree of superheat. According to the control method of the air-conditioner expansion valve, the control device and the air-conditioner, the self-adaptability of the adjustment of the expansion valve along with the changing of the temperature is achieved, and the operating performance of the system when the valve is adjusted in a degree of superheat and the comfort of the temperature adjustment can be improved.

Description

technical field [0001] The invention belongs to the technical field of air conditioning, and in particular relates to a control method, a control device and an air conditioner for an expansion valve of an air conditioner. Background technique [0002] The operating frequency of the compressor of the inverter air conditioning system can be automatically adjusted according to the change of room temperature and set temperature, so as to achieve the effect of minimum temperature fluctuation, best comfort and best energy saving. When the operating frequency of the compressor is adjusted, the refrigerant flow rate of the circulation loop of the air conditioning system also changes. At this time, it is necessary to adjust the opening of the expansion valve synchronously to achieve the best energy efficiency control. [0003] At present, the frequency conversion air-conditioning system mainly adopts the method of superheat to adjust the opening degree of the expansion valve, and the...

AI Technical Summary

Problems solved by technology

Especially in high-temperature and high-humidity environments, the indoor evaporation pressure is high, and the evaporation temperature is too high, which will affect the calculated value of the degree of superheat, and then affect the performance of the air conditioning system that relies on the degree of superheat to adjust the opening of the expansion valve.

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