旋转轴唇密封轴表面微螺旋槽的反向泵送特性

Reverse pumping by a shaft with a microspiral groove for rotary lip seals

动力回油是提高旋转轴唇密封性能的有效手段。为了研究轴表面微观形貌对反向泵送效应的影响,对轴表面加工微螺旋槽进行数学建模,结合一种典型的油封结构,基于有限元静力分析,建立2维Reynolds方程,通过内外两层循环迭代进行数值求解。结果表明:轴表面微螺旋槽具有反向泵送效应,泵送率随转速的升高而增大。在轴表面加工微螺旋槽结构是实现零泄漏的一个可行思路。该算法可以用于其他油封结构的密封特性研究和轴表面微观形貌对密封性能的影响分析。

Hydrodynamic reverse pumping is an effective way to prevent leakage for rotary lip seals. The present research gives an elastohydrodynamie analysis of the reverse pumping effect of a shaft with a micro-spiral groove for a typical rotary lip seal. The 2-D Reynolds equation is used to predict the fluid pressure distribution. The numerical solution is obtained with a two-level iteration loop coupled with mathematical model of the shaft surface and a finite element model of the lip seal. The results show that the shaft with the micro-spiral groove produces reverse pumping with higher pumping ratios at higher rotary speeds. Thus, this method can provide zero leakage. The model developed here can also he used to study other rotary lip seals with different micro surface patterns on the shaft or seals.