Self-oil return device for vehicle air conditioner

Abstract

The invention relates to an oil return device for a vehicle air conditioner, in particular to a self-oil return device for the vehicle air conditioner. The self-oil return device comprises an exhaust pipe, a compressor, an air suction pipe, an oil loop, lubricating oil, an oil return pipe, an oil collecting bag outlet pipe, an oil collecting bag and an oil collecting bag inlet pipe. The self-oil return device is characterized in that: the compressor is successively connected to a condenser, an expansion valve, an evaporator and the oil loop in a closed loop manner, and the oil collecting bag is installed at the lowest position of the evaporator. The self-oil return device has the advantages that: air return of the compressor is utilized, the lubricating oil is brought back to the compressor, damage due to fuel starvation of the compressor can be prevented, control is simple, operation is reliable, installation is simple, and production and operation are convenient.

Description

technical field [0001] The invention relates to an automobile air conditioner, in particular to a self-oil return device for an automobile air conditioner. Background technique [0002] During the operation of the automobile air conditioning system, the condenser, evaporator and refrigerant delivery pipeline will store a part of the lubricating oil of the compressor. For automotive refrigeration and air-conditioning systems without oil separation devices, when the lubricating oil discharged from the compressor with high-pressure refrigerant gas passes through a refrigeration cycle, the amount of oil returned to the interior of the compressor is too small to meet the lubrication requirements of the compressor. The compressor will be short of oil, which will cause insufficient lubrication. The light one will cause the compressor to malfunction, and the severe one will wear out the parts and damage the compressor. The existing automobile refrigeration and air-conditioning syst...

AI Technical Summary

Problems solved by technology

For automotive refrigeration and air-conditioning systems without oil separation devices, when the lubricating oil discharged from the compressor with high-pressure refrigerant gas passes through a refrigeration cycle, the amount of oil returned to the interior of the compressor is too small to meet the lubrication requirements of the compressor. The compressor will be short of oil, which will cause insufficient lubrication. The light one will cause the compressor to malfunction, and the severe one will wear out the parts and damage the compressor.

The existing automobile refrigeration and air-conditioning system utilizes the mutual solubility characteristics of refrigerant and lubricating oil. The ability of lubricating oil to dissolve refrigerant after long-term use will decrease, and the refrigerant used in automobile air conditioners will be impure, which will cause ineffective oil return.

Images