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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。
The piston rod seal fluid lubrication model was established for the parallel piston rod seal clearance. The stationary surface of the seal is set to be adiabatic while the moving surface is kept at room temperature. The effect of the thermal effect on the fluid lubrication of the seal is investigated. Considering the influence of seal rough surface on fluid pressure, the effects of relative sliding velocity, roughness amplitude and wavelength are discussed and compared with the smooth surface. The results show that the smooth seal gap can only form dynamic pressure oil film considering the thermal effect and the relative sliding velocity large enough. The dynamic pressure oil film on the rough seal surface depends on the combined effect of the thermal effect and the geometric wedge effect caused by the microscopic roughness. The larger the rough peak amplitude, the longer the wavelength, the greater the relative sliding speed, the more obvious dynamic pressure effect.