微造型在机械密封作用机理研究中若干关键问题的探讨

Developments in Researching on the Role of the Micro Modelling on the Face of the Mechanical Seal

为探讨端面微造型在机械密封中的作用机理,以形成动压效应的几何楔空间为切入点,分析了端面微造型在摩擦副表面中的几何构成。分析结果表明:端面微造型使摩擦副表面几何形貌不平,并借助压差流和剪切流形成动压效应,而表面微观几何形貌是一种特殊的微造型。实验结果的分析表明,表面微观几何形貌不平可影响动压效应,经电化学光整加工的表面微观几何形貌使润滑膜增厚。机械密封中的摩擦副表面微造型不仅具有润滑与密封的作用,而且还具有速度式泵送与容积式泵送的效应。表面微造型的不平度、分布密度以及形状等因素对润滑膜厚度及其稳定性等影响的研究将有助于机械密封理论和技术的进一步发展。

In order to investigate the functional mechanism of face micro modelling in mechanical seals,the study analyzes the geometric composition of face micro modelling in friction pair surface, which uses the wedge space geometry with hydrodynamic effect as the pointcut. The analysis shows that the micro modelling in end-faces causes uneven geometrical morphology in friction pair surface,and forms hydrodynamic effect through differential pressure flow as well as shearing flow.Moreover,the surface micro geometric morphology is a type of special micro modelling. The analysis of the experimental results shows that the unevenness of surface micro geometric morphology is able to affect the hydrodynamic effect,and the surface micro geometric morphology by electrochemical finishing machining can thicken the lubricating film. The micro modelling of friction pair surface in mechanical seals not only possesses the functions of lubrication and sealing,but also has the effects of speed-type pumping as well as volume-type pumping. The thesis researches the effects of the unevenness,distribution density and shapes of surface micro modelling on the lubricant film thickness as well as stability,which will contribute to the further development of mechanical seals theory and technology.