干气密封推环用弹簧蓄能密封圈工作特性研究  

Working Performance of Push Ring’s Spring Energized Seal

作　　者：吴杰 陈志[1] 赵鹏[1] 吉华[1] WU Jie;CHEN Zhi;ZHAO Peng;JI Hua(School of Chemical Engineering,Sichuan University,Sichuan Chengdu 610065,China)

机构地区：[1]四川大学化学工程学院,四川成都610065

出　　处：《摩擦学学报》2021年第4期532-542,共11页Tribology

摘　　要：干气密封推环用密封圈关系到补偿环的浮动性和追随性.通过建立弹簧蓄能密封圈的二维轴对称等效模型,对有、无凸台两种结构的弹簧蓄能密封圈,模拟了不同工况下的密封特性及摩擦特性.研究表明:两种结构弹簧蓄能密封圈的峰值接触压力随介质压力、预压缩率的增加而增大,都具有良好的自紧密封特性.推环微动时密封圈的摩擦力较大,不能忽略.推环轴向微动时,有凸台结构与无台结构的弹簧蓄能密封圈表现出不同摩擦行为;无台弹簧蓄能密封圈,在推环沿±Z方向微动时,摩擦特性曲线相似.而有凸台的弹簧蓄能密封圈,当推环沿Z方向微动时,分离距离更大;推环沿-Z方向微动时,具有更小的最大静摩擦力,且滑动摩擦力与最大静摩擦力差值较小,滑动平稳,有利于补偿环恢复到设计工作位置.Seal ring of the push ring in the dry gas seal is related to the floatability and tracing ability of compensated ring. By establishing a 2-D axisymmetric equivalent model of spring energized seal ring,the sealing characteristics and friction characteristics of spring energized seal rings with and without a boss were simulated under different working conditions. The results showed that the maximum contact pressure of two kinds of spring energized seal rings increased with the increase of medium pressure and precompression rate,and they had good self-tight characteristics. The friction of the spring energized seal ring was large and not ignorable. When the push ring moved in the axial direction,the spring energized seal rings with and without a boss structure showed different friction behaviors. When the push ring moved along ±Z direction,the friction characteristic curves of the spring energized seal ring without a boss were similar.However,the spring energized seal ring with a boss had a larger breakaway distance when the push ring moves in Z direction. It had smaller maximum static friction,and the difference between sliding friction and maximum static friction was smaller resulting in a smooth slide when the push ring moved along the-Z direction,which were beneficial for the compensated ring to return to the designed working position.

关 键 词：弹簧蓄能密封圈 密封特性 摩擦特性 干气密封 数值模拟 

分 类 号：TB42[一般工业技术]