极靴一体化磁性液体密封结构

Magnetic Fluid Sealing Structure of Integrated Pole Shoe

极靴一体化磁性液体密封具有良好的应用前景,为研究极靴一体化磁性液体密封耐压性能的影响因素,对一体化极靴结构参数进行了分析.首先,推导了磁性液体密封结构的耐压公式;其次,使用有限元仿真分析磁性液体密封结构的耐压性能,首次分析了有无薄壁、薄壁厚度、极齿与薄壁的轴向距离以及多级极靴尺寸分布比例对于磁性液体密封结构耐压的影响;最后,加工了极靴一体化磁性液体密封装置,搭建实验台进行实验研究.结果表明:一体化极靴比传统极靴磁性液体密封耐压略小,但相差不大;薄壁厚度以及极齿与薄壁轴向距离均与密封结构耐压值成反比;对于多级极靴结构,磁铁之间的极靴长度大于两侧极靴长度,更利于磁性液体密封的耐压.

Magnetic fluid seal of integrated pole shoe has promising prospect.To study the factors affecting its pressure resistance,the structural parameters of the integrated pole shoe are analyzed.First,the pressure resistance formula of the magnetic fluid sealing structure is deduced.Second,the finite element simulation is used to analyze the pressure performance of the magnetic fluid seal structure,in terms of thin-wall presence,thin-wall thickness,axial distance between pole teeth and thin wall,and the distribution ratio of multi-stage pole shoe size.Finally,the magnetic fluid sealing device of integrated pole shoe was made,and an experimental platform was built.The results show that the pressure resistance of the integrated pole shoe is slightly smaller than that of the traditional pole shoe,but the difference is trivial;the thin wall thickness and the axial distance between pole teeth and the thin wall are inversely proportional to the pressure resistance of the sealing structure;for the multi-stage pole shoe structure,the length of the pole shoe between the magnets is longer than the pole shoe length on both sides,which is more conducive to the pressure resistance of the magnetic fluid seal.