LaserFace液体润滑端面密封性能研究

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LaserFace液体润滑端面密封（LF-MS）能提供全膜润滑,密封寿命得到延长,可以应用于几乎所有清洁液体介质润滑的场合,特别适用于易汽化介质等苛刻工况。针对LF-MS,采用混合接触理论,建立了其二维数学分析模型,通过液膜压力分布和液膜速度场的分析揭示了LF-MS的工作机理,对比分析了等深和变深动压槽LF-MS、普通平面端面密封及含矩形引流槽端面密封等4种不同端面结构机械密封的性能。结果表明：LF-MS具有端面动压效应好、摩擦系数低及液膜刚度高的优点,综合性能明显优于普通端面密封和含矩形引流槽端面密封,且与等深动压槽相比变深动压槽对提高LF-MS的密封性能作用明显。 The LaserFace mechanical seal（LF-MS） uses two sets of recesses in one of the sealing faces that can introduce fully lubrication film between the faces.Therefore,the working life of such a seal can be prolonged.It can be applied for almost all services in which the sealed mediums are clean liquids,especially suitable for sealing volatile mediums.In this paper,the theory of mixed lubrication is used to analyze the LaserFace lubrication modes.A two-dimensional Reynolds equation is presented and resolved by finite element method to get the fluid film pressure fields between the faces.The work mechanism of a LaserFace seal is disclosed by its pressure distribution and velocity fields of liquid film.The comparisons of sealing performance among two types of a LF-MS with equal or varied depths of ‘return flow’（RF） structures and a general face seal and a general face seal with ‘entry flow’structures are performed.The results show that a LF-MS is possessed of excellent advantages that its hydrodynamic affect is better,axial film stiffness is higher and friction coefficient is lower than that of the other two types of seals.A LF-MS with variable RF structure depth performs better than that of a LF-MS with equal RF structure depth.