高速气动涡轮气体多孔质径向轴承结构设计和性能分析  

Structural Design and Performance Analysis of High Speed Pneumatic Turbine Gas Porous Radial Bearings

作　　者：葛载涛 张晓峰 杜洪峰 张大卫[1] GE Zaitao;ZHANG Xiaofeng;DU Hongfeng;ZHANG Dawei(Tianjin University,School of Mechanical Engineering,Tianjin 300072,China)

机构地区：[1]天津大学机械工程学院

出　　处：《润滑与密封》2019年第8期23-29,共7页Lubrication Engineering

基　　金：工业(汽车)喷涂机器人研发;天津市智能制造科技重大专项(15ZXZNGX00200)

摘　　要：由于涡轮转子和涡轮喷杯的悬臂作用,高速气动涡轮在工作中易发生转轴倾斜现象。为探讨轴径倾斜对多孔质气体径向轴承性能的影响,设计双槽型和单槽型2种多孔质气体径向轴承结构,并分析多孔材料的变厚度分布、偏心率和倾斜角大小等结构误差和系统运动误差对轴承性能的影响。结果表明:在偏心率一定的情况下,双沟槽结构的刚度和承载能力高于相同条件下的单沟槽结构,并且在高速运转状态下,随着倾角的增加双沟槽结构具有更高的垂直力矩和水平力矩;当偏心率增大时,双沟槽的刚度高于单沟槽,所以双沟槽具有更好的抗倾斜能力;当气膜厚度增加时,2种结构的垂直力矩和水平力矩都下降,说明气膜厚度对轴承抗倾斜能力具有一定影响。Due to the cantilever action of the turbine rotor and the turbine spray cup,the high speed pneumatic turbine is prone to inclined shaft during operation.To investigate the influence of inclined shaft on the performance of porous gas journal bearings,two kinds of porous gas journal bearings with double grooves and single grooves were designed.The effects of structural errors such as variable thickness distribution of porous materials,eccentricity and inclination angle and systematic motion errors on the performance of the bearings were analyzed.The results show that the stiffness and bearing capacity of the double groove structure are higher than that of the single groove structure under the same eccentricity.In the condition of high speed operation,the double groove structure has higher torque in the vertical and horizontal directions with the increase of inclination angle.With the increase of eccentricity,the stiffness of the double groove is higher than that of the single groove,so the double groove structure has better anti-tilt capacity.With the increase of air film thickness,the torque in the vertical and horizontal directions of the two structures is decreased,which indicates that the air film thickness has a certain influence on the bearing anti-tilt capacity.

关 键 词：多孔质径向气体轴承 高速气动涡轮 稳态分析 沟槽设计 

分 类 号：TH133.36[机械工程—机械制造及自动化]