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

Abstract

The invention discloses an air conditioning system and a control device and a method of the air conditioning system. A first port of an indoor heat exchanger is connected with a compressor through a third pipeline; a second port of the indoor heat exchanger is connected with an outdoor heat exchanger through a second pipeline; N branch circuits connected in parallel are connected with the second pipeline in a series or parallel manner; N valve modules are correspondingly arranged on the N branch circuits; each valve module is used for controlling opening or closing of the corresponding branch circuit; a first temperature detecting unit is used for detecting the refrigerant temperature of the indoor heat exchanger; a second temperature detecting unit is used for detecting the air suction temperature of the compressor; and a control unit is used for obtaining the temperature difference between the air suction temperature of the compressor and the refrigerant temperature of the indoor heat exchanger and controlling opening or closing of the N valve modules according to the temperature difference. The refrigerant flow of the air conditioning system can be controlled through controlling opening or closing of the valve modules, so that no overheating phenomenon of a refrigerant fed in the indoor heat exchanger is guaranteed, and the refrigeration performance of an air conditioner is improved.

Description

technical field [0001] The present invention relates to the technical field of air conditioning, in particular to a control device for an air conditioning system, an air conditioning system, a control method for an air conditioning system, and a non-transitory computer-readable storage medium. Background technique [0002] In the related art, the volume of the evaporator and the condenser of the frequency conversion high-energy-efficiency air-conditioning system are usually relatively large, and the system refrigerant charge is 30% higher than that of the ordinary air-conditioning system. However, the problem with related technologies is that high-energy-efficiency systems generally use small-displacement compressors, and the amount of refrigerant exceeds the maximum charge of the compressor, which poses a greater safety hazard to the compressor's liquid return, oil return, and reliability. , Moreover, when the compressor is running at low frequency, the flow rate of the sys...

AI Technical Summary

Problems solved by technology

However, the problem with related technologies is that high-energy-efficiency systems generally use small-displacement compressors, and the amount of refrigerant exceeds the maximum charge of the compressor, which poses a greater safety hazard to the compressor's liquid return, oil return, and reliability. , Moreover, when the compressor is running at low frequency, the flow rate of the system is small, and the refrigerant basically accumulates in the condenser, resulting in less refrigerant in the evaporator, resulting in fluctuations in the return air temperature of the compressor and higher temperatures , the cooling capacity of the system decreases, and the EER (Energy Efficiency Ratio, the cooling performance coefficient of the air conditioner) decreases significantly

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