Research And Optimization Of Separation Characteristics Of Oil And Gas Separator For Electric Scroll Compressor

With the rapid development of electric vehicles,scroll compressors for electric vehicle air conditioning have gradually become the focus of research.Automobile air conditioning systems have high requirements on the oil content of the high-pressure refrigerant gas discharged from the scroll compressor.The oil-gas separator is the core component of the scroll compressor to recover the lubricating oil.If the high-pressure refrigerant gas carries an excessively high oil content,an oil film will be formed on the pipe wall,affecting the heat exchange effect of the automotive air conditioning system,resulting in a decrease in refrigeration efficiency,and even causing insufficient oil return of the scroll compressor,causing dynamic and static scroll Problems such as wear and tear.This subject is based on the oil and gas separator in the front casing of a company's electric vehicle scroll compressor,and uses a combination of theoretical calculation and Fluent software simulation to explore the internal flow field of the oil and gas separator under different speeds.And separat ion performance,and on the premise of not changing its structural size,with reference to engineering application analysis,the inlet structure of the oil and gas separator was optimized for equal area,and the method of simulation was used to analyze the scroll compressor at different speeds.The influence of different inlet structures on the separation performance of oil and gas separators.The results show that the theoretical calculation results of the flow field and pressure drop in the oil-gas separator are close to the numerical simulation res ults,indicating that the method of numerical simulation is feasible;with the increase in the speed of the electric scroll compressor,the overall tangential velocity in the oil-gas separator As the inlet velocity increases,the pressure loss also increas es,while the dynamic pressure loss accounts for a small proportion and the static pressure loss accounts for a large proportion;at the same time,the increase in the inlet velocity contributes to the internal vortex rotation axis.The reduction of the left and right swing amplitude is helpful to improve the instability of the cyclone,but in the oil-gas separator,the tangential velocity of some gases cannot balance the larger pressure gradient and has a downward axial velocity,resulting in a local "seco ndary flow ",Mainly including the " short flow path " around the exhaust pipe,longitudinal vortex and backflow,etc.,causing its energy loss;the increase in separation efficiency increases first and then tends to be smooth,so it is necessary to comprehensively consider the economics and Practicability to improve the separation performance;after studying the flow field characteristics of four different inlet structure oil and gas separators,it was found that the rectangular inlet separator with the aspect ratio Large pressure drop also increases.Under the condition of satisfying the pressure drop empirical model calculation,the rectangular-1 inlet has better flow field symmetry than the other three inlet separators,which helps to improve the separatio n performance.The results of this study can provide references for the optimal design and in-depth research of oil and gas separators.