低速运转气膜机械密封端面粗糙度对其密封性能的影响  

The Influence of Roughness of Seal Faces on the Operating Performance of Gas Face Seal at Slow Speed

作　　者：李伟[1] 宋鹏云[1] 曹登峰[1] 赵越 

机构地区：[1]昆明理工大学,云南昆明650224 [2]曲靖卷烟厂,云南曲靖655000

出　　处：《润滑与密封》2006年第10期87-91,共5页Lubrication Engineering

基　　金：云南省自然科学基金资助项目(2003E0022M);云南省教育厅教学科研学术带头人人才项目

摘　　要：以螺旋槽气体润滑机械密封为研究对象，采用有限单元法分析了各向同性的粗糙度对低速运转气体润滑机械性能的影响，并提出了适用于低速运转气膜机械密封特性分析的修正雷诺方程。理论分析表明：低速运转条件下，表面粗糙度对气膜机械密封各项性能均有较大的影响，在研究气膜机械密封特性时，要考虑表面粗糙度的影响；在特定膜厚条件下，当膜厚与粗糙度均方根的比值大于3～4时，表面粗糙度对密封性能的影响可以忽略不计；在较大粗糙度下，虽然密封开启力、气膜刚度随转速增加而显著提高，但同时泄漏量也明显加大，因此随着转速增加，较大粗糙度对气膜密封低速运转性能是有害的。The influence of seal face＇ s isotropy roughness on spiral grooved gas face seal performance at low speed was analyzed by finite dement method. The revised Renault equation was presented which can be used analyze the gas face mechanical seal performance at low speed. It is showed that the surface roughness has great effects on spiral grooved gas face seal operating performances at low speed. When the roughness value is greater, seal opening force and gas film stiffness are increased with the increasing of the operating speed, but the leakage is also increased. With the increasing of the operating speed, the greater roughness value is harmful to the gas face seal operating performance at low speed.

关 键 词：机械密封 气膜密封 粗糙度 有限元法 

分 类 号：TH136[机械工程—机械制造及自动化]