磁流体密封的磁路设计及磁场有限元分析  

Design of Magnetic Circuit and Simulation of Magnetic Fluid Sealing

作　　者：杨小龙[1] 李德才[1] 杨文明[1] 邢斐斐[1] 李强[1] 

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

出　　处：《真空科学与技术学报》2012年第10期919-922,共4页Chinese Journal of Vacuum Science and Technology

摘　　要：为了在磁流体密封结构的密封间隙内获得最大的磁能积以及提高磁流体密封的耐压能力,在磁路设计理论和磁流体密封理论的基础上,对一种并联型的磁流体密封结构进行磁路设计,采用有限元法数值计算出磁流体密封结构中的磁场从而计算出磁流体密封耐压能力,并对计算结果进行了分析和讨论。结果表明:极靴与永磁体结合处的漏磁以及中间极靴轴向长度较短,导致中间极靴与两侧极靴下密封间隙内的磁感应强度差成非线性关系,也导致了磁路法低于有限元法计算出的磁流体密封耐压能力;中间极靴下密封间隙内磁感应强度较大导致两侧极靴下密封间隙内的磁感应强度差近似相等。The magnetic field distributions in the sealing gap of the magnetic fluid sealing structure was modeled and simulated in finite element method with ANSYS code,based on the magnetic circuit design＇and the magnetic fluid theory. First, the magnetic circuit of the parallel structured magnetic fluid seal was designed. Next, the magnetic field distribution in the sealing gap of the magnetic fluid sealing structures was evaluated. Finally, the magnetic fluid sealing capacity was calculated. The simulated results show that the two factors account for the nonlinear relationship between the magnetic in- duction intensity differences at the sealing gaps under the two side pole-shoes and the middle pole-shoe; one factor is the magnetic leakages at the connections of the pole-shoe and permanent magnets, the other is the shorter axis of the middle pole-shoe. The two factors also explain why the magnetic fluid sealing capacity calculated by magnetic circuit technique is lower than that simulated in finite element method. In addition, the strong magnetic induction intensity at the sealing gap beUow the middle pole-shoe results in approximately equal magnetic induction intensity differences under the two side pole-shoes.

关 键 词：磁流体 密封 磁路设计 数值计算 

分 类 号：TH136[机械工程—机械制造及自动化]