Oil return system of low-pressure cavity compressor air conditioner

Abstract

The invention discloses an oil return system of a low-pressure cavity compressor air conditioner, which comprises a compressor, an oil-gas separator, four-way valves, an outdoor heat exchanger, an indoor heat exchange mechanism and a gas-liquid separator, wherein the indoor heat exchange mechanism is formed by connecting an electronic expansion valve and an indoor heat exchanger in series, the compressor, the oil-gas separator, the four-way valve, the outdoor heat exchanger, the indoor heat exchange mechanism, the four-way valve and the gas-liquid separator are sequentially connected along the circulating direction of a refrigerant to form a refrigerant loop, the oil-gas separator and the gas-liquid separator are connected with an oil return pipeline, the oil return pipeline is provided with a throttling device, a bypass pipe is arranged between the oil-gas separator and the compressor, and the bypass pipe is provided with a control valve. In the oil return system of the low-pressure cavity compressor air conditioner provided by the invention, the oil storage capacity in the compressor is improved, the aggregation of a liquid refrigerant in the compressor is reduced, and the wet operation of the compressor when started is prevented, thereby the safety of the starting operation of the compressor is improved.

Description

technical field [0001] The invention relates to the field of air-conditioning equipment, in particular to an oil return system for a low-pressure chamber compressor air-conditioner. Background technique [0002] The air conditioner is the air conditioner (air conditioner), and the hanging air conditioner is a unit used to provide processing air to a space area (generally closed). Its function is to adjust the parameters such as temperature, humidity, cleanliness and air flow rate of the air in the room (or closed space, area) to meet the requirements of human comfort or process. Its working principle is: the compressor compresses the gaseous refrigerant into a high-temperature and high-pressure liquid refrigerant, and then sends it to the condenser (outdoor unit) to dissipate heat and becomes a normal temperature and high-pressure liquid refrigerant, so the outdoor unit blows out hot air; When it is hot, there is a part called a four-way valve, which makes the flow directio...

AI Technical Summary

Problems solved by technology

The low-temperature refrigerant will also gather in the lower temperature parts of the system, such as the oil-gas separator and the bottom of the compressor. When restarting, it will easily cause wet operation and liquid shock. At the same time, due to the sudden drop in the internal pressure of the compressor, the refrigerant will flow from the compressor The oil at the bottom overflows quickly, and the compressor oil foams a lot, causing a large amount of oil discharge from the compressor, which is easy to burn out the compressor

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