磁性液体离心密封深沟球轴承设计与试验

摘要

将磁性液体特殊的零泄漏密封性能与流体离心密封可获较高压强的特性有机结合，在动力学计算分析基础上，开展磁性液体离心密封件的磁场仿真模拟，实施磁性液体离心密封深沟球轴承的优化设计与试制。在对两组轴承分别实施无密封处理及磁性液体离心密封处理后，本实验将两组轴承置于密闭空间内并对其运转时释放的微粒进行探测实验。实验发现未经密封处理的轴承释放出大量微粒，而实施磁性液体密封处理的轴承对密闭空间几乎没有明显微粒释放。结果表明，这种磁性液体离心密封的深沟球轴承能有效地减少润滑剂的散失和磨损微粒的排放，适用于高度洁净和真空的特殊环境。%Combining the special behavior of ferrofluid in no leaking seals and the high pressure in fluid based centrifugal seals, using the knowledge of computational hydrodynamic analysis, in this paper, the simulation of ferrofuild centrifugal seals is carried out to design and optimize for ball bearings. We set two bearings respectively in non-sealed and ferrofluid sealed conditions, then detect the particle concentration released by bearings in obdurate environment. The results clearly show that, the particle concentration released from non-sealed bearing increases significantly while the particle concentration from ferrofluid-sealed bearing stays steady. According to the test, this type of ferrofuild centrifugal seals for ball bearings can significantly reduce the loss of lubricant and the emission of wearing particles into the air, which shows a strong evidence that it can be used under the extreme clean or vacuum circumstance.