Carbon dioxide air source heat pump system capable of avoiding compressor liquid return impact

Abstract

The invention discloses a carbon dioxide air source heat pump system that avoids the impact of compressor liquid return, and belongs to the field of carbon dioxide heat pumps. The existing carbon dioxide air source heat pump system has attenuated heating capacity, decreased energy efficiency, and poor oil return in the existing carbon dioxide air source heat pump system. The invention adds an oil return type gas-liquid separator and an oil return casing evaporator type air cooler to the existing carbon dioxide air source heat pump system. When the system performs oil return work, the liquid oil and refrigerant in the oil return pipeline Absorb the heat from the oil return casing evaporator type air cooler to evaporate the oil, atomize the liquid refrigerant and turn the liquid refrigerant into gas, avoid the damage of the compressor due to the impact of liquid return, prolong the life of the compressor and improve the stability of the system sex, reliability.

Description

technical field [0001] The invention belongs to carbon dioxide heat pump technology, and in particular relates to a carbon dioxide air source heat pump system which avoids the impact of liquid return from a compressor. Background technique [0002] The traditional heat pump water heater system is mainly composed of a compressor, a throttle valve, an evaporator and a condenser. The basic working principle is: the refrigerant absorbs the heat of a low-temperature object in the evaporator, evaporates into a gas medium, and the gas medium from the evaporator passes through The compression of the compressor turns into a high-temperature and high-pressure gas medium. The high-temperature and high-pressure gas medium releases heat energy to high-temperature objects in the condenser, and at the same time it becomes a high-pressure liquid medium. The high-pressure liquid medium flows through the expansion valve to throttle and reduce pressure, and then It becomes a superheated liquid...

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Problems solved by technology

[0004] The technical problem to be solved and the technical task proposed by the present invention are to overcome the problem of poor heating and oil return in low-temperature environment of existing heat pump water heater products and the problem of oil return and liquid return at the same time, and provide a carbon dioxide air source that avoids the impact of compressor liquid return The heat pump system makes the system run at low temperature and returns oil, so that the liquid oil and refrigerant accumulated in the oil return type gas-liquid separator enters the oil return sleeve evaporator type air cooler to absorb heat and evaporate, so that the oil is atomized, The liquid refrigerant turns into gas, and the gaseous refrigerant and the atomized oil return to the oil return type gas-liquid separator and finally return to the compressor to run, so as to avoid the damage to the compressor caused by the system's liquid return due to oil return. Extend the life of the compressor while improving system stability and reliability

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