Abstract

To improve the pressure capability of ferrofluid seals with small clearance, a converging ferrofluid seal with double magnetic sources was designed. The magnetic field distribution in the clearances of the converging ferrofluid seal was studied by employing the finite-element method, and the theoretical pressure capability of the seal is calculated. The effects of ferrofluid injection volume, radial clearance, axial clearance, and the numbers of radial pole teeth and axial pole teeth on the pressure capabilities of converging ferrofluid seal device were investigated by experimental methods and compared with the experimental pressure capability of the stepless ferrofluid seal. The results show that the experimental and theoretical pressure capabilities of the converging ferrofluid seal are in good agreement. The saturated ferrofluid injection volume of the converging ferrofluid seal device is 1 mL. The experimental pressure capability of the converging ferrofluid seal does not decrease with increasing clearance or decreasing number of pole teeth. The pressure capability of the converging ferrofluid seal is related not only to the size of the clearance but also to the number of pole teeth. The pressure capability of the converging ferrofluid seal is better than that of the stepless ferrofluid seal.

摘要

为提高小间隙磁流体密封的承压能力，设计了一种双磁源收敛磁流体密封。采用有限元方法研究了收敛磁流体密封间隙中的磁场分布，计算了密封的理论承压能力。通过实验方法研究了磁流体注入量、径向间隙、轴向间隙、径向极齿数和轴向极齿数对收敛式磁流体密封装置承压能力的影响，并与无级磁流体密封的实验承压能力进行了比较。 . 结果表明，收敛磁流体密封的实验和理论压力能力符合良好。收敛磁流体密封装置的饱和磁流体注入量为1mL。会聚铁磁流体密封的实验压力能力不会随着间隙的增加或极齿数的减少而降低。收敛式磁流体密封的承压能力不仅与间隙的大小有关，还与极齿的数量有关。收敛式磁流体密封的承压能力优于无级磁流体密封。