活塞杆密封的流体润滑分析  

Analysis of Hydrodynamic Lubrication for Piston-rod Seals

作　　者：刘晓玲[1] 李传敏[1] 宋飞宇 

机构地区：[1]青岛理工大学机械工程学院,山东青岛266033 [2]青岛运输设备制造厂,山东青岛266041

出　　处：《煤矿机械》2011年第8期99-101,共3页Coal Mine Machinery

基　　金：国家自然科学基金资助项目(51075221)

摘　　要：针对活塞杆密封平行间隙建立了活塞杆密封的流体润滑模型。设密封静止表面绝热,而运动表面保持常温,研究了热效应对密封件流体润滑的影响。考虑密封粗糙表面对流体压力的影响,讨论了相对滑动速度、粗糙峰幅值和波长的影响,并与光滑表面进行了比较。结果表明,光滑密封平行间隙只有考虑热效应且相对滑动速度足够大才能形成动压油膜;粗糙密封表面的动压油膜取决于热效应和微观粗糙度引起的几何楔效应的联合作用。粗糙峰幅值越大,波长越长,相对滑动速度越大,动压效应越明显。A hydrodynamic lubrication model was established tor the parallel gap between seals and the piston-rod. The influence of thermal effect on the hydrodynamic lubrication of seals was investigated, assumed that the static sealing surface is adiabatic, and the temperature of the moving surface is constant. The effect of rough surface for seals on the fluid pressures was considered, and the influence of relative sliding velocity, the amplitude, and the wavelength of the roughness of the seal＇s surface on the hydrodynamic lubrication was discussed. Comparison of solutions between the rough and the smooth surface was made. Results show that, the hydrodynamic film for the smooth seal parallel gap is formed only when the thermal effect and certain high relative sliding speed were involved. However, the hydrodynamic film is determined by the joint action of the geometry wedge caused by the roughness and the thermal effect. If the amplitude is larger, the wavelength is longer, or the relative sliding velocity is higher, the dynamic effect will be more remarkable.

关 键 词：密封平行间隙 活塞杆 热效应 粗糙度 

分 类 号：TB42[一般工业技术]