Air conditioner oil return system and air conditioner

Abstract

The invention relates to an air conditioner oil return system and an air conditioner. A condensing unit, an air cooler, a first expansion valve, a first check valve, a first oil return valve, a secondoil return valve, a third oil return valve, an oil gathering device and a controller are included; the condensing unit comprises a compressor, a four-way valve, a condenser, a liquid supply solenoidvalve and a gas-liquid separator; if the controller detects that the air conditioner executes defrosting operation, it is adjusted that the liquid supply solenoid valve is closed, the first end and the third end of the four-way valve communicate with each other, the second end and the fourth end of the four-way valve communicate with each other, the first expansion valve is closed, the first oil return valve is opened, and the second oil return valve is opened; and if the controller detects that the air conditioner stops executing defrosting operation and executes refrigeration operation, it is adjusted that the first oil return valve is opened, the third oil return valve is opened, the first end and the second end of the four-way valve communicate with each other, the third end and the fourth end of the four-way valve communicate with each other, freezing oil is transferred back into the compressor, the oil lacking phenomenon of the compressor is reduced, and the air conditioner failure rate is reduced.

Description

technical field [0001] The present application relates to the technical field of air conditioners, in particular to an air conditioner oil return system and an air conditioner. Background technique [0002] Small and medium-sized cold storage uses a refrigeration cycle system composed of frequency conversion condensing units and cooling fans. Due to the limitation of the cold storage site, the distance between the condensing unit and the cooling fan is often far away, the connecting pipe is long, and the temperature of the cold storage is low, and the viscosity of the refrigerating oil is high. Poor fluidity will cause a large amount of refrigeration oil to be stored in the air cooler, resulting in oil shortage in the condensing unit. [0003] In general, the oil return of the condensing unit is to bring the oil droplets back to the condensing unit through the suction airflow when the condensing unit is inhaled, or, by using the reverse operation method, the refrigerated oil...

AI Technical Summary

Problems solved by technology

[0004] However, due to the limitations of the cold storage site and environment, conventional air suction and oil return can no longer suck the refrigerated oil in the air cooler into the compressor of the condensing unit, and because the distance between the condensing unit and the air cooler is relatively long, the connecting pipe between them is relatively large. Long, when the conventional switching four-way valve system operates in reverse, the refrigerated oil in the air cooler can only migrate to the condenser in the condensing unit, and it is also impossible to transfer the refrigerated oil from the air cooler back to the compressor in the condensing unit, resulting in The compressor is short of oil, causing the air conditioner to fail

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