端面微形体对液体润滑机械密封性能的影响  

Effect of Face Asperity Geometry on Performance of a Liquid Lubricated Face Seal

作　　者：彭旭东[1] 杜东波[2] 盛颂恩[1] 李纪云[3] 

机构地区：[1]浙江工业大学机械制造及自动化教育部重点实验室,浙江杭州310032 [2]中国石油大学机电工程学院,山东东营257061 [3]浙江工业大学机电工程学院,浙江杭州310032

出　　处：《摩擦学学报》2007年第4期352-356,共5页Tribology

基　　金：国家自然科学基金资助项目(50575152);教育部科学技术研究重点基金资助项目(03107);宁波市高新科技资助项目(2006B100030)

摘　　要：针对等深(高)凹(凸)微形体端面液体润滑机械密封,采用有限元法求解等温及层流不可压缩二维Reynolds方程研究了在端面开启力与闭合力平衡的状态下,圆形、正方形、六边形和三角形等不同凹(凸)微形体端面机械密封的平均液膜厚度、摩擦扭矩、液膜刚度和泄漏量等密封参数随微形体面积比的变化规律,并比较了"凹"、"凸"2种微形体端面机械密封的性能.结果表明:微形体面积比对密封性能影响较大,且"凸"微形体端面密封的性能参数所受影响较"凹"微形体密封大;在相同工况和面积比条件下,"凹"微形体端面密封的综合性能优于"凸"微形体端面密封.Finite element method was used to solve the two-dimension Reynolds equation for the isothermal, laminar and incompressible liquid flow between the two faces of a liquid lubricated face seal, onto which of one face was the same shape asperities. Positive （protruding） and negative （recessed） asperities of constant height （depth） were considered with circular, square, hexagonal and triangular cross-sections. The effects of asperity area ratio on the static sealing performance of such a face seal, which mainly included the average liquid film thickness, frictional torque, film stiffness and leakage rate, were investigated at the equilibrium condition. Comparison of sealing per formance between the two types of such seals with positive and negative asperities respectively was made. It was found that asperity area ratio affected sealing performance, in which a face seal with positive asperities was affected more severely, but a face seal with negative asperities exhibited better performance than that of the positive one when they operated at the same condition and with the same asperity area ratio.

关 键 词：表面微形体 机械密封 液体润滑 有限元分析 

分 类 号：TH136[机械工程—机械制造及自动化]