Control method and device for electronic expansion valves as well as multi-online system

Abstract

The invention provides a control method and device for electronic expansion valves as well as a multi-online system. The method comprises the following steps that gas pipe temperature, liquid pipe temperature, coil pipe temperature and evaporating temperature of each indoor unit and gas suction temperature of a compressor are obtained; when it is detected that the gas pipe temperature of any indoor unit is not lower than the sum of the gas pipe temperature average value of other indoor units and a first preset value, the difference value between the gas pipe temperature and the liquid pipe temperature of any indoor unit is larger than a second preset value, the current opening degree of the electronic expansion valve of any indoor unit is a third preset value and the difference value between the gas suction temperature and the evaporating temperature does not exceed a fourth preset value, the coil pipe temperature average value is calculated according to of the coil pipe temperature ofthe other indoor units; according to the gas pipe temperature average value, the coil pipe temperature average value and the coil pipe temperature of any indoor unit, the actual air pipe temperatureis calculated; and according to the actual gas pipe temperature and the liquid pipe temperature of any indoor unit, the opening degree of the corresponding electronic expansion valve is adjusted. Theoperation reliability of the unit is improved, and the liquid return of the compressor is prevented.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to a control method, device and multi-connection system of an electronic expansion valve. Background technique [0002] A multi-split system usually includes one or more outdoor units and multiple indoor units. At present, due to reasons such as production, installation, and transportation, the indoor units in the multi-split system often have the air pipe temperature sensor loose or fall off. When the unit is running in cooling mode, the air pipe temperature detected by the air pipe temperature sensor The actual temperature of the air pipe will be too high, and the obtained superheat of the indoor unit will also be too high, which will lead to the opening of the electronic expansion valve of the indoor unit is too large, the refrigerant circulation of the indoor unit is too much, and the evaporation is not complete, so that the suction side of the compressor exists. Liqui...

AI Technical Summary

Problems solved by technology

At present, due to reasons such as production, installation, and transportation, the indoor units in the multi-split system often have the air pipe temperature sensor loose or fall off. When the unit is running in cooling mode, the air pipe temperature detected by the air pipe temperature sensor The actual temperature of the air pipe will be too high, and the obtained superheat of the indoor unit will also be too high, which will lead to the opening of the electronic expansion valve of the indoor unit is too large, the refrigerant circulation of the indoor unit is too much, and the evaporation is not complete, so that the suction side of the compressor exists. Liquid refrigerant, actual liquid return phenomenon is serious, damage the compressor

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