Air conditioning system and control device and method thereof

Abstract

The invention discloses an air conditioning system and a control device and method thereof. The device comprises a first on-off valve and / or a second on-off valve, a temperature acquiring module and acontrol module. One end of the first on-off valve is connected with an air return opening of a compressor, and the other end of the first on-off valve is connected with a throttle element and a condenser. One end of the second on-off valve is connected with a middle air spray opening of the compressor, and the other end of the second on-off valve is connected with the throttle element and the condenser. The temperature acquiring module is used for acquiring the exhaust temperature of the compressor. The control module is used for controlling turning on or off of the first on-off valve and / orthe second on-off valve according to the exhaust temperature of the compressor in the process that the air conditioning system operates in a heating mode so that the exhaust temperature of the compressor can be within a preset temperature range. Thus, stability of the exhaust temperature of the system can be maintained, the requirement during system normal operating can be met, it can be guaranteed that the system reliably operates within the wide temperature range, and meanwhile the service life of the compressor can be prolonged.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to a control device for an air conditioning system, an air conditioning system with the control device and a control method for the air conditioning system. Background technique [0002] At present, when the air source screw heat pump unit is heating at low temperature, due to the low ambient temperature, the suction pressure is low, so that the refrigerant flow rate is small, while the screw compressor motor is mainly cooled by suction. At this time, the compression The engine is prone to insufficient cooling and the exhaust temperature rises. In addition, under severe working conditions, the compressor needs to be unloaded, so that the flow rate of the refrigerant will be less, and the exhaust temperature will continue to rise. When the exhaust temperature of the compressor is too high, it will accelerate the aging of the relevant components of the compressor, and the lu...

AI Technical Summary

Problems solved by technology

However, when there is a gas-liquid separator on the suction side, the above-mentioned method is difficult to work, because the liquid refrigerant will be separated by the gas-liquid separator and remain in the gas-liquid separator, so that the liquid refrigerant cannot enter the compressor, thus failing to achieve The purpose of reducing the discharge temperature of the compressor

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