制冷压缩机径向气浮轴承的静态特性分析  

Analysis of Static Characteristics of Journal Gas Bearing Used in Refrigeration Compressor

作　　者：滕斌 杨启超 王春 赵远扬 李连生 TENG Bin;YANG Qichao;WANG Chun;ZHAO Yuanyang;LI Liansheng(College of Electromechanical Engineering,Qingdao University of Science and Technology,Qingdao Shandong 266000,China)

机构地区：[1]青岛科技大学机电工程学院,山东青岛266000􀤕􀤕􀤕􀤕􀤕􀤕􀤕􀤕􀤕

出　　处：《润滑与密封》2021年第5期34-40,共7页Lubrication Engineering

基　　金：国家自然科学基金项目(51976095);热能动力技术重点实验室开放基金项目(TPL2018A02)。

摘　　要：为研究以R134a为润滑工质的制冷压缩机径向气浮轴承的静态性能,基于流体润滑的雷诺方程,通过理论假设实现气体轴承的建模与分析,采用数值分析对三维气膜流场进行分析,得到动压轴承的气膜厚度分布、气膜压力分布、承载力、稳定性等特性,并与以空气为工质的径向气浮轴承进行比较。结果表明:在相同的情况下以R134a为工质的气体轴承的承载力比以空气为工质的小,两者的承载力都随着偏心率、轴承间隙、转速的增大而增大,所以在设计以R134a为工质的气浮轴承时,偏心率和轴承间隙都要比以空气为工质时偏大;以R134a为工质的转子系统的稳定性比以空气为工质的差,两者系统的稳定性都随着偏心率、转速的增大而趋于稳定,这表明要使转子系统获得相同的稳定性,以R134a为工质的气浮轴承要设计较大的偏心率。In order to study the static characteristics of the journal gas bearing with R134 a as the working fluid used in refrigeration compressor,based on the Reynolds equation of fluid lubrication,the gas bearing was modeled and analyzed through theoretical assumption.The calculation of the three-dimensional gas film flow field was carried out by numerical analysis,and the characteristics of the gas film pressure distribution,gas film thickness distribution,bearing capacity and stability of the dynamic pressure bearing were obtained.The calculation results were compared with those of the journal gas bearing with air as the working fluid.The results show that under the same conditions,the bearing capacity of the gas bearing with R134 a as the working fluid is smaller than that with air as the working fluid,and the bearing capacity of both is increased with the increase of the eccentricity,bearing clearance and rotating speed.Therefore,the gas bearing with R134 a as working fluid should design a larger eccentricity and bearing clearance compared with the gas bearing with air as the working fluid.The stability of the qualitative system with R134 a as working fluid is worse than that with air as the working fluid,and the stability of both systems tends to be stable as the eccentricity and speed increase.Therefore,the gas bearing with R134 a as working fluid should design a larger eccentricity compared with the gas bearing with air as the working fluid.

关 键 词：制冷压缩机 动压气体轴承 制冷剂 静态特性 

分 类 号：TH133.36[机械工程—机械制造及自动化]