油气润滑条件下电主轴轴承腔内多相流特性分析

Analysis of Multi-phase Flow Characteristics in Bearing Cavity of Motorized Spindle under Oil-gas Lubrication

基于油气润滑气液两相流理论,采用COMSOL Multiphysics仿真软件建立B7003CY/P4角接触球轴承腔内的油气两相流模型,分析轴承腔内气相流速、压力以及润滑油的分布。通过计算轴承的摩擦生热量以及腔内关键点的换热系数,分析轴承腔内温度场的分布。试验与仿真结果表明:润滑油沿着进油管道进入轴承腔内,大量的润滑油聚集在轴承腔内的前端,少许润滑油会随着空气进入轴承腔内,而进气速度影响润滑油的分布;轴承腔内的温度受电主轴的转速和进气压力影响,随着电主轴转速提高,摩擦产生的热量增多,轴承腔内的温度升高;进气压力越大,空气流速越大,轴承腔内的温度越低,且轴承腔内换热系数细化后得出的温度场更接近真实值。

Based on the gas-liquid two-phase flow theory of oil-gas lubrication,the oil-gas two-phase flow model in the B7003CY/P4 angular contact ball bearing cavity was established by using COMSOL Multiphysics simulation software,the gas flow velocity pressure and the distribution of lubricating oil in the bearing cavity were analyzed.The distribution of temperature field in the bearing cavity was analyzed by calculating the heat generated by the friction of the bearing and the heat transfer coefficient of the key points in the cavity.The experimental and simulation results show that the lubricating oil enters the bearing cavity along the oil inlet pipe,and a large amount of lubricating oil collects in the front end of the bearing cavity,a little lubricating oil enters the bearing cavity with the air,and the intake speed affects the distribution of lubricating oil.The temperature in the bearing cavity is affected by the speed of the motorized spindle and the intake pressure;as the motorized spindle speed increases,the heat generated by the friction increases,and the temperature inside the bearing cavity increases;as theinlet pressure increases,the air velocity increase,the temperature in the bearing cavity decreases,and the temperature field is closer to the true value after the heat transfer coefficient in the bearing cavity is refined.