考虑惯性力的高速螺旋槽止推轴承承载性能研究  

Research on Bearing Characteristic of High Speed Spiral Groove Thrust Bearing Considering Inertia Force

作　　者：李洁 杨光伟 杨晓威 杜建军 LI Jie;YANG Guangwei;YANG Xiaowei;DU Jianjun(Harbin Institute of Technology,Shenzhen,Shenzhen Guangdong 518055,China;China Academy of Engineering Physics,Mianyang Sichuan 621900,China;Suzhou Inovance Technology Co.,Ltd.,Suzhou Jiangsu 215104,China)

机构地区：[1]哈尔滨工业大学(深圳),广东深圳518055 [2]中国工程物理研究院机械制造工艺研究所,四川绵阳621900 [3]汇川技术有限公司,江苏苏州215104

出　　处：《润滑与密封》2020年第4期12-19,共8页Lubrication Engineering

基　　金：深圳市科技计划项目(JCYJ20160427184134564,JCYJ20170811154117143);国家自然科学基金项目(51675121).

摘　　要：通常在气体轴承相关计算中简化了雷诺方程,忽略了惯性力的影响。而当轴承转速非常大时,气体的惯性力影响增大,忽略惯性力会带来较大误差。建立考虑惯性力的高速螺旋槽气体止推轴承理论计算模型,采用有限元法求解雷诺方程,得到考虑惯性力时的气膜压力分布和轴承承载力,并分析转速变化时轴承承载力的变化。结果表明,高转速时气体的惯性力会显著降低轴承承载力。分析50000 r/min高转速下各参数变化对承载力的影响。结果表明:螺旋槽深度及槽长比变化时,承载力均会出现极大值,且在出现极大值时惯性力的影响最大;随着气膜厚度增大,承载力逐渐下降,且惯性力的影响逐渐增大;随着螺旋槽数量增加,承载力逐渐增大,而惯性力的影响较稳定。分析转子轴线倾斜对承载力的影响,结果表明在相同转速及相同轴承参数下转子轴线倾斜时承载力略微增大。The Reynolds equation is usually simplified in gas bearing calculations,and the effects of inertial forces is ignored.When the bearing speed is very large,the effect of inertial force of the gas will increase,ignoring the inertia force will cause a large error.The theoretical calculation model of high-speed spiral groove gas thrust bearing considering inertial force was established.The finite element method was used to solve the Reynolds equation,and the gas film pressure distribution and bearing capacity were calculated when considering the inertial force.The change of bearing capacity with speed was analyzed.It is found that the inertial force of the gas at high speed will significantly reduce the bearing capacity of the bearing.The effect of various parameter on the bearing capacity was analyzed under the high bearing speed of 50000 r/min.The results show that when the depth of the spiral groove and the ratio of the groove length change,the bearing capacity will have a maximum value,and the effect of the inertial force is the greatest when the maximum value occurs.As the film thickness increases,the bearing capacity is gradually decreased,and the effect of inertial force is gradually increased.As the number of spiral grooves increases,the bearing capacity is increased gradually,and the effect of inertial force is relatively stable.The effect of rotor axis tilt on the bearing capacity was analyzed.It is found that the bearing capacity is increased slightly when the rotor axis is tilted under the same rotation speed and the same bearing parameters.

关 键 词：止推气体轴承 螺旋槽 惯性力 承载特性 轴线倾斜 

分 类 号：TB42[一般工业技术]