Air conditioning system control method, air conditioning system control device and air conditioning system

Abstract

The invention discloses an air conditioning system control method. An air conditioning system comprises N indoor units in one-to-to correspondence with electronic expansion valves, wherein N refers to an integer larger than 1. The control method includes the steps: detecting an outdoor environment temperature; when the air conditioning system meets a preset defrosting condition, controlling the air conditioning to access to a defrosting mode, and determining the number of the electronic expansion valves needing to be started from the N electronic expansion valves according to the outdoor environment temperature; controlling corresponding electronic expansion valves of the N electronic expansion valves to be started according to the number of the electronic expansion valves needing to be started. Using the control method can improve degree of superheat of refrigerant in a compressor shell of the air conditioning system during defrosting and guarantee that the refrigerant is less prone to dissolution in refrigeration oil of a compressor, and accordingly thinning of oil films due to attenuation of the refrigeration oil can be avoided, and lubrication requirements of the compressor can be guaranteed. The invention further discloses an air conditioning system control device and the air conditioning system.

Description

technical field [0001] The invention relates to the technical field of air-conditioning control, in particular to a control method for an air-conditioning system, a control device for the air-conditioning system, and an air-conditioning system with the control device. Background technique [0002] Usually, the throttle valves (that is, electronic expansion valves) of all indoor units will be opened to the maximum during defrosting in a one-to-multiple air-conditioning system, which makes the defrosting speed faster. However, at the same time, the superheat of the refrigerant in the compressor shell will be low, so that the refrigerant will condense into a liquid and dissolve in the refrigeration oil, resulting in a thinner oil film and unable to meet the lubrication requirements of the compressor. High, the volume of the evaporator and condenser in the air conditioning system is getting larger and larger, the refrigerant charge is also getting larger, and the refrigeration o...

AI Technical Summary

Problems solved by technology

However, at the same time, the superheat of the refrigerant in the compressor shell will be low, so that the refrigerant will condense into a liquid and dissolve in the refrigeration oil, resulting in a thinner oil film and unable to meet the lubrication requirements of the compressor. High, the volume of the evaporator and condenser in the air conditioning system is getting larger and larger, the refrigerant charge is also increasing, and the refrigeration oil is more likely to be diluted

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