螺旋槽干式气体端面密封的刚度和泄漏量研究  

Study of stiffness and leakage rate of spiral groove dry gas face seals

作　　者：冯向忠[1] 彭旭东[1] 

机构地区：[1]中国石油大学机电工程学院,山东东营257061

出　　处：《石油大学学报（自然科学版）》2005年第2期83-85,92,共4页Journal of the University of Petroleum,China(Edition of Natural Science)

基　　金：国家教育部科学技术研究重点项目基金资助(03107)

摘　　要：干式气体端面密封(DGS)是一种非接触式机械密封,适用于大多数气体密封场合,了解密封特性尤其是气膜刚度和泄漏量对正确设计密封非常重要。针对螺旋槽气体端面密封结构,用有限元法计算了密封端面的气膜压力分布及密封的气膜刚度和泄漏量等特性参数,分析了密封面的槽深比、螺旋角和槽长坝长比等两两变化时对密封特性的影响。研究表明,当槽深比取2.0～2.5,螺旋角取15°,槽长、坝长比取1.5～2.0,槽台宽比取1.0,槽数取12～18时,可在确保密封泄漏量低的同时具有较大气膜刚度。Dry gas face seal (DGS) is one of non-contacting mechanical face seals that can be applied to most of the gas transportation machines. It is very important for designing the seal correctly to understand the seal behavior, especially gas film stiffness and leakage rate. The finite element method was used to solve the two-dimensional Reynolds equation for getting the gas film pressure distribution between the two faces of a spiral-groove face seal (S-DGS). The static sealing performances, such as gas film stiffness and leakage rate were determined. Subsequently the effects of seal geometrical parameters pairwise changed on the behavior of a S-DGS were analyzed, which mainly refer to the ratio of groove depth to gas film thickness, the length ratio of the spiral-groove to the seal dam, and the spiral-groove angle. The recommended geometrical parameters were presented, which can assume large film stiffness while the leakage rate is very small.

关 键 词：气体端面密封 泄漏量 螺旋槽 干式 非接触式机械密封 气膜刚度 密封特性 密封结构 特性参数 压力分布 密封端面 有限元法 螺旋角 密封面 槽深 

分 类 号：TH136[机械工程—机械制造及自动化] TQ547.91[化学工程—煤化学工程]