The purpose of this paper is to investigate the dynamic contact behavior and transient response of liquid lubricated non-contacting mechanical seals during external pressure fluctuation. The presented model of spiral groove mechanical seals includes the Reynolds equation considering surface roughness and mass-conserving cavitation boundary, elastoplastic asperity contact model expressing rub-impact phenomenon, as well as the dynamic equation describing the vibrations of stator which were solved simultaneously with a numerical method. Results indicate that the vibration amplitude and frequency of sealing performances are affected significantly by the external pressure. The increment of rotational speed avoids face rub-contact and reduces the instantaneous variation of leakage. The results presented in the study are expected to provide a theoretical guidance to improve stability and safety of sealing system.

本文的目的是研究在外部压力波动期间液体润滑的非接触式机械密封的动态接触行为和瞬态响应。提出的螺旋槽机械密封模型包括考虑表面粗糙度和保持质量的空化边界的雷诺方程，表达摩擦影响的弹塑性粗糙接触模型，以及描述定子振动的动力学方程，该方程同时用数值求解。方法。结果表明，密封性能的振动幅度和频率受外部压力的影响很大。转速的增加避免了表面摩擦接触并减少了泄漏的瞬时变化。