大菱形孔端面密封力变形及密封性能分析

针对等深大菱形孔端面液体润滑机械密封，采用有限差分法求解等温及层流不可压缩二维Reynolds方程，获得液膜压力场。利用商用有限元软件计算密封环三维固体变形，对不同操作工况条件下和不同结构的密封环的力变形、摩擦扭矩、液膜刚度及泄漏率等性能参数进行了计算。结果表明：大菱形孔流体动压型机械密封端面产生周向波度和径向锥度变形；改变工况条件可使密封面形成收敛和发散两种不同的变形，密封性能参数因此产生显著变化；当面积比B=0.65～0.75时，大菱形孔端面密封可获得较好的密封性能；辅助密封圈O形圈位置l对径向锥度变形具有很大影响，l优选值范围为2.4～4.0 mm。

Analysis of surface deformation and seal performance of mechanical face seal with diamond macro-pores

For a liquid lubricated end face mechanical seal with diamond macro-pores, the finite difference method was used to solve the two-dimension Reynolds equation for the isothermal, laminar and incompressible lubrication film and film pressure distribution was obtained. Finite element software was used to calculate surface deformation of seal rings. Deformation and seal performance parameters, such as friction torque, liquid film stiffness and leakage rate were investigated under different operating conditions for different sealing rings constructions. The results showed that the end face of mechanical seal deformed with circumferential waviness and radial coning. Convergent and divergent deformations occurred according to different operating conditions, hence seal performance greatly changed. When B was 0.65-0.75, the mechanical seal could achieve better sealing performance. The location of the secondary O ring greatly influenced radial taper deformation, the range of l preferred values was 2.4-4.0 mm.