Air conditioner and control method and device of electronic expansion valve of indoor unit

Abstract

The embodiment of an air conditioner and a control method and device of an electronic expansion valve of an indoor unit, and relates to the technical field of air conditioners. The air conditioner andthe control method and device are used for reducing the output power of a compressor of an outdoor unit after a certain indoor unit in a VRF air conditioning system stops running, and energy is saved. The method comprises the steps that when the indoor unit is in a heating mode, if the indoor unit stops running, the inlet temperature and the outlet temperature of a heat exchanger of the indoor unit are acquired; the inlet temperature is the temperature generated when a refrigerant flows into the heat exchanger of the indoor unit, and the outlet temperature is the temperature that the refrigerant flows out of the heat exchanger of the indoor unit; the difference value between the outlet temperature and the inlet temperature is calculated, and the change amount of the electronic expansion valve is calculated according to the difference value; whether the difference value is within the preset temperature range is judged; and if the difference value is not within the preset temperature range, the opening degree of the electronic expansion valve is adjusted according to the change amount. The air conditioner and the control method and device are applied to the VRF air conditioning system.

Description

technical field [0001] The present invention relates to the technical field of air conditioning, and in particular to an air conditioner and a control method and device for an electronic expansion valve of an indoor unit. Background technique [0002] Multi-connected air-conditioning system refers to an air-conditioning system in which an outdoor unit is connected to two or more indoor units through piping, and the electronic expansion valve of the indoor unit is a throttling device commonly used in multi-connected air-conditioning systems. flow. [0003] When the indoor unit in the multi-split air conditioning system stops running, the electronic expansion valve of the indoor unit usually does not close completely, but opens slightly. Because the refrigerant and compressor oil flow together in the refrigerant pipeline when the multi-connected air conditioner system is running, when an indoor unit in the multi-connected air conditioner system stops running, if the electroni...

AI Technical Summary

Problems solved by technology

Because the refrigerant and compressor oil flow together in the refrigerant pipeline when the multi-connected air conditioner system is running, when an indoor unit in the multi-connected air conditioner system stops running, if the electronic expansion valve of the indoor unit opens too small, it may It will lead to the accumulation of compressor oil and refrigerant at the electronic expansion valve, which will affect the normal operation of the compressor; and if the electronic expansion valve of the indoor unit is opened too much, the output power of the compressor of the outdoor unit will increase. resulting in wastage of energy

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