密封环圆台型织构化粗糙表面对润滑性能的影响  

Influence of Rough Surface of Sealing Ring with Micro-dimple of Cone Frustum on the Lubrication Performance

作　　者：樊智敏[1] 马瑞磷 江峰 FAN Zhimin;MA Ruilin;JIANG Feng(College of Electromechanical Engineering,Qingdao University of Science and Technology,Qingdao Shandong 266100,China)

机构地区：[1]青岛科技大学机电工程学院,山东青岛266100

出　　处：《润滑与密封》2021年第7期44-50,共7页Lubrication Engineering

基　　金：山东省重点研发计划项目(2019GGX104088)。

摘　　要：针对密封环接触面之间的润滑问题,基于Reynolds方程,考虑粗糙度的影响,建立在流体动压润滑状态下圆台型表面织构的数学模型,对密封环接触表面在不同织构参数、不同粗糙度参数下润滑膜压力大小及分布情况进行研究。采用有限差分法、牛顿迭代法研究不同润滑介质下,圆台型微凹坑的几何参数及粗糙度参数对润滑膜平均压力的影响,并与理论数值结果进行对比验证。结果表明:密封环端面的平均膜压随圆台型织构间距、小径的增大而减小,随织构大径的增大而增大;存在最佳织构深度使平均膜压最大;润滑介质黏度越大,密封环端面平均膜压越大;粗糙峰峰高越大,端面平均膜压越小,而粗糙峰波长对端面平均膜压的影响较小,因此粗糙峰应尽可能小;存在织构参数、粗糙度参数的最优组合使润滑膜平均压力值达到最大。Aimed at the lubrication problem between the contact surfaces of the seal ring,based on the Reynolds equation and considering the influence of roughness,a mathematical model of the surface texture of the truncated cone at the hydrodynamic lubrication state was established.The lubrication film pressure and distribution on the contact surface of seal ring under different texture parameters and roughness parameters were studied.The finite difference method and Newton iteration method were used to study the influence of the geometric parameters and roughness parameters of the truncated cone-shaped micro-pits on the average pressure of the lubricating film under different lubricating media,and the results were compared with theoretical numerical results.The results show that the average film pressure of the sealing end face is decreased with the increase of the distance and small diameter of the truncated cone-shaped texture,and increased with the increase of the large diameter of the texture.There is an optimal texture depth to maximize the average film pressure of the lubricating film.The greater the viscosity of lubricating media,the greater the average film pressure on the end face of the seal ring.The higher the roughness peak height,the smaller the average film pressure,while the roughness peak wavelength has small influence on the average film pressure,so the roughness peak should be as small as possible.There is an optimal combination of texture parameters and roughness parameters to maximize the average pressure of the lubricating film.

关 键 词：微凹坑织构 表面粗糙度 流体动压润滑 密封环 

分 类 号：TH117.1[机械工程—机械设计及理论]