Heat pump circulating system suitable for low-temperature environment

Abstract

The invention belongs to the technical field of heat pumps, and particularly relates to a heat pump circulating system suitable for low-temperature environment. The heat pump circulating system comprises a compressor, a first heat exchanger, a throttling device, a second heat exchanger, a four-way valve and a gas-liquid separator. When the heat pump circulating system is in a heating state in the low-temperature environment, a high-pressure refrigerant before entering the throttling device is guided into a high-pressure refrigerant pipe in a gas-liquid separator so as to exchange heat with unevaporated low-temperature low-pressure liquid-state refrigerant in the gas-liquid separator to completely evaporate the unevaporated low-temperature low-pressure liquid-state refrigerant in the gas-liquid separator into a gaseous refrigerant, so that a refrigerant returning the compressor is the gaseous refrigerant completely; the high-pressure refrigerant in the high-pressure refrigerant pipe further releases heat in the gas-liquid separator, super-cooling degree of the refrigerant in the high-pressure refrigerant pipe is increased, and energy efficiency of the whole heat pump circulating system is further improved.

Description

technical field [0001] The invention belongs to the technical field of heat pumps, in particular to a heat pump cycle system suitable for low-temperature environments. Background technique [0002] Heat pump technology has developed rapidly in recent years, especially in northern China, it is the general trend to replace traditional coal-fired heating with air source heat pumps. At present, when the room temperature machine is heating in a low-temperature environment (-5°C-10°C), due to the low ambient temperature of the evaporator, the low-temperature and low-pressure liquid refrigerant in the evaporator is difficult to evaporate, which not only leads to a decrease in the suction capacity of the compressor, but also reduces the If the ratio is lowered, the heating effect will be affected, and the liquid refrigerant will return to the compressor, causing liquid shock of the compressor. If this happens for a long time, the compressor will be damaged. Contents of the inventi...

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Problems solved by technology

At present, when the room temperature machine is heating in a low-temperature environment (-5°C-10°C), due to the low ambient temperature of the evaporator, the low-temperature and low-pressure liquid refrigerant in the evaporator is difficult to evaporate, which not only leads to a decrease in the suction capacity of the compressor, but also reduces the If the ratio is lowered, the heating effect will be affected, and the liquid refrigerant will return to the compressor, causing liquid shock of the compressor. If this happens for a long time, it will cause damage to the compressor

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