Heat pump system, gas suction overheating degree control method, and gas-liquid separator accumulated-liquid evaporation control method

Abstract

The invention provides a heat pump system, a gas suction overheating degree control method, and a gas-liquid separator accumulated-liquid evaporation control method. The heat pump system comprises a compressor, a reversing element, an outdoor heat exchanger, a first throttle element, a flash evaporator, a second throttle element, an indoor heat exchanger and a gas-liquid separator which are connected through pipelines to form a gas supply and enthalpy-increasing air conditioning cycle, and the first pipeline between the first throttle element and the flash evaporator is located in the gas-liquid separator so as to transfer heat of a refrigerant in the first pipeline to a gas outlet pipe of the gas-liquid separator. According to the heat pump system, the gas suction overheating degree control method, and the gas-liquid separator accumulated-liquid evaporation control method, the gas exhaust temperature of the compressor is decreased while the gas suction regenerative overheating degreeof the compressor is increased, and the operation reliability of the compressor is ensured while the performance of the heat pump system is improved.

Description

technical field [0001] The invention belongs to the technical field of heat pump systems, and in particular relates to a heat pump system, a suction superheat degree, and a method for controlling fluid accumulation and evaporation of a gas-liquid separator. Background technique [0002] For some refrigerants such as R134a, R290, R407c, R507, etc., increasing the heat recovery cycle in the system is especially beneficial to its heating and refrigeration cycle performance, and with the increase of the degree of heat recovery superheat, the performance of the aforementioned refrigerants will increase accordingly Increase. However, excessive reheat superheat will lead to excessively high discharge temperature of the compressor, which will adversely affect the operation performance of the compressor. The current heat pump system with the function of supplementing air to increase enthalpy can only supply air in the pipeline. The refrigerant is lowered in temperature (that is, the...

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Problems solved by technology

However, excessive reheat superheat will lead to excessively high discharge temperature of the compressor, which will adversely affect the operation performance of the compressor. The current heat pump system with the function of supplementing air to increase enthalpy can only supply air in the pipeline. The refrigerant is lowered in temperature (that is, the air supply temperature is lower) to improve the compression performance of the compressor, but as mentioned above, this reduces the reheating superheat of the refrigerant and makes the performance of the refrigerant poor

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