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

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.