表面粗糙度对橡塑O形圈往复密封性能的影响
Effect of Surface Roughness on Reciprocating Sealing Performance of Rubber O-ring
梁鹤 1王腾飞 1王文中 1郭玉龙2
作者信息
- 1. 北京理工大学机械与车辆学院,北京 100081
- 2. 中国机械设备工程股份有限公司,北京 100073
- 折叠
摘要
建立三维确定性混合润滑数值仿真模型,该模型采用统一Reynolds方程系统法,耦合了固体力学分析、流体力学分析和接触力学分析;生成非高斯粗糙表面,基于混合润滑模型研究表面粗糙度、自相关长度比值和纹理方向对橡塑0形圈往复密封摩擦力、泄漏率、平均膜厚和接触面积比等密封性能的影响规律.研究表明:低速时随着表面粗糙度的增大,润滑区接触面积比增大,引起摩擦因数增大,平均膜厚先增大后减小,临界接触面积比约为40％;在混合润滑状态时,对于横向纹理粗糙表面,存在合适的自相关长度比值使得密封的摩擦因数和接触面积比最低;当纹理方向θ=π/10时,摩擦因数最小.
Abstract
A three-dimensional deterministic numerical simulation model of mixed lubrication was established.The mod-el adopted the unified Reynolds equation based on the system method and coupled the solid mechanics analysis,fluid me-chanics analysis and contact mechanics analysis.Non Gaussian rough surfaces were generated,based on the mixed lubrica-tion model,the effects of surface roughness amplitude,autocorrelation length ratio and texture direction on the sealing prop-erties of O-ring reciprocating seal,such as friction,leakage rate,average film thickness and contact area ratio,were investi-gated by using the non-Gaussian rough surface.The results show that with the increase of surface roughness,the friction co-efficient,average film thickness and leakage rate increase.When the Ra increases to a certain value and the contact area of the lubrication area is greater than 40％,the average film thickness and leakage rate begin to decrease.For a rough surface with transverse texture,there is an appropriate y,which makes the comprehensive performance and lubrication state of the seal optimal.When θ=π/10,the friction coefficient reaches the minimum value.
关键词
往复密封/0形圈/表面粗糙度/确定性模型/动特性Key words
reciprocating seal/O-ring/surface roughness/deterministic model/dynamic performance引用本文复制引用
基金项目
国家自然科学基金项目(U2141243)
国家自然科学基金项目(52175158)
出版年
2024
NETL
NSTL
万方数据