卸荷角对斯特封密封性能的影响  

Effect of Unloading Angle on Sealing Performance of Step Seal

作　　者：王凯华 郭飞[2] 项冲 王新华[1] WANG Kaihua;GUO Fei;XIANG Chong;WANG Xinhua(Department of Materials and Manufacturing,Beijing University of Technology,Beijing 100124,China;State Key Laboratory of Tribology,Tsinghua University,Beijing 100084,China)

机构地区：[1]北京工业大学材料与制造学部,北京100124 [2]清华大学摩擦学国家重点实验室,北京100084

出　　处：《润滑与密封》2022年第3期24-32,共9页Lubrication Engineering

基　　金：国家重点研发计划项目(2018YFB2001001);航空科学基金项目(201907058001)。

摘　　要：利用ABAQUS软件开展卸荷角对斯特封密封性能影响的有限元仿真分析。基于单轴拉伸压缩试验获取橡胶和塑料材料应力-应变曲线定义材料属性,通过建立初步接触、过盈装配、流体压力直接加载3个分析步模拟斯特封真实工作状况,分别得出不同流体压力载荷下有、无卸荷角斯特封的应力应变云图、密封面接触压力分布图等,并计算出抱轴力、摩擦力等密封性能参数,研究卸荷角的影响规律。结果表明:卸荷角的存在会明显改善斯特封塑料环的变形状态,使其腰部不会发生向内凹陷的现象,而是一种向卸荷角方向的倾斜;卸荷角的存在还会使斯特封所受摩擦力变小,对改善密封性能、减少机械损耗,延长使用寿命起到了积极作用。ABAQUS software was used to carry out the step seal finite element simulation analysis about the effect of unloading angle on the sealing performance.Based on uniaxial tension compression test for rubber and plastic material stressstrain curve to define material properties,by establishing three analysis steps of initial contact,interference assembly and direct fluid pressure loading to simulate the real working conditions of the step seal,the stress-strain nephogram and the contact pressure distribution diagram of the sealing surface with and without unloading angle under different fluid pressure loads were obtained.The axial force,friction were calculated to study the effect of unloading angle.The results show that the existence of the unloading angle can obviously improve the deformation state of the step seal plastic ring,so that the waist of the plastic ring will not sag inward,but an tilt towards the direction of the unloading angle.The existence of the unloading angle will make the friction of the step seal become smaller,which plays a positive role in improving the sealing performance,reducing the mechanical loss and prolonging the service life.

关 键 词：斯特封 卸荷角 密封性能 往复密封 摩擦力 

分 类 号：TB42[一般工业技术]