摘要
开设导水槽的外转子双轴颈阶梯腔滑动轴承为电子水泵径向轴承的常见结构,轴承水膜压力和承载力直接影响转子系统的稳定性和使用寿命.采用有限元方法对具有不同水槽的外转子滑动轴承水膜特性进行流体分析,获得了一定转速和偏心率下的轴承水膜压力分布规律,研究了水槽结构和槽数对水膜压力与承载力的影响.结果表明,转子内孔导水槽改变了双轴颈部位水膜压力分布,梯形截面水槽轴承具有较好的承载力.与无槽结构相比,直线导水槽使轴颈水膜周向压力曲线不光滑,转子系统承载力下降且出现周期径向波动,压力峰值随水槽数量的增加而减小.螺旋型水槽显著提升了轴承水膜压力、承载力和平稳性,但导水槽螺旋升角增至60°时,双轴颈轴向水膜压力分布出现不均衡.
Abstract
The outer rotor double journal stepped cavity sliding bearing with grooves is a common structure of electronic water pump bearings.The water film pressure and bearing capacity directly affect the stability and service life of the rotor system.The fluid analysis on the water film characteristics of outer rotor sliding bearings with different grooves is carried out based on the finite element method.The distribution law of bearing water film pressure under a certain speed and eccentricity is obtained.The Influence of structure and number of grooves on water film pressure and bearing capacity are investigated.The results show that the grooves change the water film pressure distribution in the double journal area.The bearing with the trapezoidal cross-section water groove has better bearing capacity.Compared with the grooveless structure,the circumferential pressure curve of the journal water film becomes unsmooth due to the linear groove.The water film bearing capacity decreases and fluctuates periodically along the radial direction.The peak pressure decreases as the number of grooves increases.The spiral groove significantly increases the water film pressure,bearing capacity and stability,but an uneven distribution of axial water film pressure on the double journal appears when the groove spiral angle increases to 60°.
基金项目
芜湖市重大科技成果工程化项目(2022ZC07)
河南省研究性教学改革研究与实践项目(2023147)
NETL
NSTL
万方数据