仿生凹坑非光滑密封圈有限元分析

Finite Element Analysis of Bionic Pit Non-smooth Sealing Ring

针对超临界流体萃取过程中高压环境下的密封问题,设计了一种具有仿生凹坑特征的新型密封圈。将仿生学原理应用到橡胶圈密封技术中,通过软件对光滑与非光滑表面密封圈进行数值模拟,观察在不同压缩量、不同凹坑直径和间距时,密封圈的接触应力和Von-Mises等效应力变化情况。计算结果表明,当压缩率为12%时,光滑和非光滑密封圈产生的接触应力均达到了超临界萃取过程工作的介质压力8 MPa,其中凹坑直径为2.0 mm、凹坑间距为3.0 mm的模型具有最好的密封性能和耐磨性。

In order to solve the problem of sealing under high pressure during supercritical fluid extraction,this paper designs a new sealing ring with the characteristics of bionic pit.In this paper,the principle of bionics is applied to the rubber ring sealing technology.By means of software,the numerical simulation of smooth and non-smooth surface sealing rings is carried out to observe the changes of contact stress and Von-Mises equivalent stress of sealing rings under different compression amount,pit diameter and spacing.The results show that,when the compression rate is 12%,the contact stress generated by both smooth and non-smooth sealing rings reaches the media pressure of 8 MPa working in the supercritical extraction process,and the model with pit diameter of 2.0 mm and pit spacing of 3.0 mm has the best sealing performance and wear resistance.