深孔加工输油器密封结构分析与密封设计

Magnetic Fluid Sealing of Oil Feeder for Deep-Hole Drilling:A Simulation and Experimental Study

探讨和比较了现有密封结构各自性能和在输油器上的应用。基于磁流变液密封设计输油器,利用有限元仿真分析磁场强度分布及其对磁流体密封性的影响;依据理想气体状态方程探讨压力变化和泄漏量的关系,并用真空压力传感器对比实验证实该磁流体输油器的密封性能更加优异。

The impact of the magnetic field distribution on the magnetic fluid sealing of oil-feeder for deep-hole drilling was mathematically modeled,numerically simulated and experimentally evaluated with leak detection. The simulated results show that the magnetic field uniformly distributed in the permanent magnet,pole shoe and magnetic shaft sleeve and the strongest magnetic field at the pole tooth effectively blocked the magnetic flux leakage. As the magnetic field increased,the sealing pressure gradually increased to a plateau. Besides,the dependence of the leakrate on the pressure was theoretically analyzed. The simulated and measured results show that when it comes to oilfeeder sealing,the magnetic fluid sealing outperforms the conventional sealing techniques,including the O-ring sealing,lip sealing and Glyd-ring sealing,because of the tighter sealing,lower wear-rate,higher thermal stability,and stronger resistance against possible mechanical damages.