非完整液膜上游泵送密封特性分析

Study of the features of a non-complete liquid film upstream pumping seal

针对密封端面动压槽数量较少或低速低压密封运转过程,上游泵送密封端面处于非开启状态,提出一种能有效润滑密封表面并减少泄漏量的非完整液膜上游泵送密封。利用Fluent流场分析软件,建立了非完整液膜上游泵送密封模型,对比分析了非完整液膜上游泵送密封和接触式机械密封的液膜承载能力和端面润滑特性;研究了在不同工况和动压槽深度情况下,非完整液膜上游泵送密封的液膜承载能力和动压开启效果的变化规律。结果表明:非完整液膜上游泵送密封的液膜承载能力随着工作压力和转速的增加而增加,动压开启效果随着工作压力的增大而减小,转速的增加而增加;液膜承载能力和动压开启效果随着膜厚的增加而减小。

Because of a small number of dynamic pressure grooves on a seal surface during the sealing process at low-speed and low-pressure,the upstream pumping seal surface may not open,which leads to a non-complete liquid film upstream pumping seal which can effectively lubricate the sealing surface. By means of the Fluent software,a model of a non-complete liquid film upstream pumping seal has been set up,and then the liquid force and lubricating properties of the non-complete liquid film upstream pumping seal and complete liquid film upstream pumping seal,as well as the contacting mechanical seal,are studied. The variation of the non-complete liquid film upstream pumping seal＇s liquid force and dynamic pressure opening effect have been studied for different conditions and dynamic pressure groove depth. It was found that the liquid force increases with increasing operating pressure and speed,whilst the dynamic pressure opening effect decreases with increasing operating pressure and increases with increasing speed. The liquid force and the dynamic pressure opening effect increases with increasing dynamic pressure groove depth.