磁性液体密封新结构及耐压性能理论研究  

Theoretical Research on the Novel Magnetic Fluid Seal Structure and Its Pressure Resistance

作　　者：袁芳 王四棋[1] 李德才[1,2] 陈铎 邸楠楠 李文怡 YUAN Fang;WANG Siqi;LI Decai;CHEN Duo;DI Nannan;LI Wenyi(School of Mechanical,Electronic and Control Engineering,Beijing Jiaotong University,Beijing 100044;State Key Laboratory of Tribology,Tsinghua University,Beijing 100084)

机构地区：[1]北京交通大学机械电子与控制工程学院,北京100044 [2]清华大学摩擦学重点实验室,北京100084

出　　处：《机械工程学报》2022年第3期213-220,共8页Journal of Mechanical Engineering

基　　金：中央高校基本科研业务费专项资金(2019JBM054);北京市自然科学基金(3182013)资助项目。

摘　　要：对于某特定大尺寸主轴重型装备,主轴在高线速度运转中会出现一定的径向摆动,导致密封泄漏问题。传统单一轴向磁性液体密封结构未能满足该设备出现径向摆动时的耐压要求,为了解决这一问题,并考虑到机械设备的主轴密封结构的轴向空间受到一定限制,提出一种新型轴向径向串联磁性液体密封结构。理论研究磁路中轴向和径向磁性液体串联密封结构的耐压性能,并利用有限元对该密封结构的密封间隙内的磁场强度进行数值模拟,根据磁性液体密封耐压理论计算出密封间隙内的理论耐压值,分析主轴径向摆动位移量对轴向、径向和系统整体密封性能的影响。结果表明,针对文中设定的密封结构,随着径向摆动位移量的增大,轴向密封处并联磁阻增大,其理论耐压值减小,径向密封处并联磁阻减小,其理论耐压值增大。在轴向和径向密封两者串联作用下,系统整体的耐压能力保持在一定范围内波动,可有效提升高速旋转轴动密封的耐压稳定性。For a certain large-size main shaft and heavy equipment,the spindle will have a certain radial swing during high linear speed operation,which will cause seal leakage.The traditional single axial magnetic liquid sealing structure fails to meet the pressure requirements of the equipment when radial swing occurs.In order to solve this problem,and considering that the axial space of the main shaft sealing structure of the mechanical equipment is limited,a novel shaft-diameter-bidirectional magnetic fluid seal structure is proposed.The pressure resistance of the axial and radial magnetic liquid series seal structure in the single magnetic source magnetic circuit is theoretically studied,and the finite element simulation is used to numerically simulate the magnetic field strength in the seal gap of the seal structure.According to the pressure resistance theory of the magnetic fluid seal,the theoretical pressure resistance value in the sealing gap is calculated,and the influence of spindle radial runout displacement on the axial,radial and overall sealing performance of the system is analyzed.The research results show that for the sealing structure set in the article,as the radial swing displacement increases,the parallel magnetic resistance at the axial seal increases,and its theoretical pressure resistance value of the axial seal decreases.The parallel magnetic resistance at the radial seal decreases,and its theoretical pressure resistance value of the radial seal increases.Under the series action of both axial and radial seals,the overall pressure capability of the system remains within a certain range,which can effectively improve the pressure stability of the high-speed rotating shaft dynamic seal.

关 键 词：磁性液体 密封 径向摆动 磁场强度 

分 类 号：TB42[一般工业技术]