关键词: 机械密封, 瞬态特性, 启停, 密封性能, 泄漏

Abstract:

Whether startup and shutdown operation of mechanical seals goes on smoothly directly influences its reliability and life span.A transient dynamic model was developed by taking into consideration the effect of liquidsolid force coupling between end faces, microcavitation and face contact.Seal parameters, such as axial displacement of floating ring, film thickness, contact pressure and leakage rate, etc were computed.Transient seal behavior of mechanical seals during startup and shutdown operation was investigated.The influence of axial runout on seal performance was analyzed.The results showed that due to the effect of axial runout and change of velocity during transient operation, key seal parameters varied correspondingly with axial runout, and large runout led to big disturbance.The model and numerical methods could be used to improve the product design method and to assess design rationality.

Key words: 机械密封, 瞬态特性, 启停, 密封性能, 泄漏