汽车排气管V形金属密封环设计与优化  

Design and Optimization of V-shaped Metallic Sealing Ring for Automotive Exhaust Pipe

作　　者：李卫民[1] 张凯璇 杨瀚文 刁家宇 LI Weimin;ZHANG Kaixuan;YANG Hanwen;DIAO Jiayu(School of Mechanical Engineering and Automatiion,Liaoning University of Technology,Jinzhou Liaoning 121001,China)

机构地区：[1]辽宁工业大学机械工程与自动化学院,辽宁锦州121001

出　　处：《润滑与密封》2023年第7期159-166,220,共9页Lubrication Engineering

基　　金：辽宁省教育厅科学研究经费项目(JZL202015401)。

摘　　要：针对汽车排气管密封问题,设计一种适合汽车排气系统密封的V形金属密封环。该密封环采用平面接触、小接触压力方式,在满足密封要求的同时避免了较大的预紧力;在波谷处采用圆弧过渡,降低了密封环的整体刚度,侧边倾斜一定角度以增大密封环的回弹性能。利用ANSYS Workbench软件对V形金属密封环常温预紧和高温工况下的密封性能进行分析,在保证密封强度要求下确定安装时合适的轴向压缩量;分析密封环结构参数对密封性能的影响,发现壁厚、环宽、波谷半径、接触圆半径、开口角度对密封性能影响较大。基于Design-Expert软件对密封环结构参数进行多目标优化,从而降低了密封环最大等效应力,提高了最大接触压力,减小了密封环质量,并通过相关实验验证有限元模型的可靠性。Aimed at the sealing problem of automotive exhaust pipe,a V-shaped metallic sealing ring for automotive exhaust system was designed.The sealing ring adopts the mode of plane contact and small contact pressure,which can meet the sealing requirements and avoid large preload.The circular arc transition is adopted at the trough to reduce the overall stiffness of the seal ring,and the side angle is tilted to increase the resilience of the seal ring.ANSYS Workbench software was used to analyze the sealing performance of the V-shaped metallic sealing ring under normal temperature pretightening and high temperature conditions,the appropriate axial compression for installation was determined under the requirement of sealing strength.The influence of sealing ring structural parameters on sealing performance was analyzed.It is found that wall thickness,ring width,trough radius,contact circle radius and opening angle have a significant impact on sealing performance.Multi-objective optimization of the sealing ring structure was carried out based on Design-Expert software,and the maximum equivalent stress of the sealing ring was reduced,the contact pressure was increased,and the mass of the sealing ring was reduced.The reliability of the finite element model was verified by relevant experiments.

关 键 词：汽车排气管 V形金属密封环 轴向压缩量 密封性能 结构优化 

分 类 号：TH136[机械工程—机械制造及自动化]