倾斜微孔端面气体密封的动压特性研究  

Hydrodynamic Performance of Inclination-dimpled Face Gas Seal

作　　者：柏林清[1] 白少先[1,2] 彭旭东[1,2] 孟祥铠[1,2] 李纪云[1,2] 

机构地区：[1]浙江工业大学机械工程学院,浙江杭州310032 [2]浙江工业大学过程装备及其再制造教育部工程研究中心,浙江杭州310032

出　　处：《摩擦学学报》2011年第2期97-103,共7页Tribology

基　　金：国家自然科学基金项目(50775206和50805130);浙江省自然科学基金(R1090833和Y1090620);浙江工业大学青年学术带头人和学术骨干支持计划项目(102004829)资助~~

摘　　要：为提高多孔端面气体密封的动压特性,提出1种双列倾斜椭圆微孔端面密封结构.基于气体润滑理论模型,采用数值方法分析了操作参数和微孔几何参数对密封泄漏率和开启力的影响规律,探讨了倾斜微孔的上、下游泵送作用对气体密封动压特性的作用机理.结果表明:与单列倾斜微孔端面气体密封相比,双列倾斜微孔端面气体密封可使动压开启力显著增加,低压侧微孔环带可将下游流体沿微孔倾斜方向向上游泵送,使得泄漏率显著降低,气体密封动压效应明显增强;密封动压性能受反向开孔比、微孔倾角、面积比和孔深等几何参数的影响,本文给出了这些参数的优化取值范围.A new type of laser surface texturing gas seal with double-row inclined dimples was introduced to improve hydrodynamic performance.Influence of operating parameters and texturing parameters on open force and leakage was numerically investigated based on a gas lubrication theory.Then,upstream and downstream pumping principles of the inclined dimples were discussed.Results showed that the gas seal with double-row inclined dimples had larger hydrodynamic open force and lower leakage than that with single-row.The reason was that the downstream fluid can be pumped to upstream from the low pressure side along the inclination direction of the dimples.The hydrodynamic performance was determined by the texturing parameters,e.g.opponent texturing proportion,dimple inclination angle,dimple area rate and dimple depth.And optimization of these main texturing parameters was demonstrated.

关 键 词：机械密封 气体润滑 倾斜微孔 动压效应 

分 类 号：TH117.2[机械工程—机械设计及理论]