摘要
为了研究工程机械用DAS组合密封圈密封特性及其变化规律,建立密封特性计算模型,使用三次多项式修正密封圈压力油侧接触应力,得到近似油膜压力分布;结合逆解法求解油膜厚度,研究DAS组合密封圈预压缩量、油液压力及活塞杆伸出速度对平均油膜厚度、内泄漏量及动摩擦力的影响。研究结果表明:随着预压缩量增大,平均油膜厚度及内泄漏量逐渐减小,动摩擦力逐渐增大;随着油液压力的增大,平均油膜厚度及内泄漏量逐渐减小,动摩擦力逐渐增大;随着活塞杆伸出速度增大,平均油膜厚度、内泄漏量及动摩擦力随之增大。综合考虑各因素对密封件磨损、内泄漏的影响,建议DAS组合密封圈应用于活塞密封时最小压缩量c=1 mm,最大活塞杆伸出速度v=0.1 m/s。
In order to study sealing performance and variation law of DAS composition ring used for engineering machinery, sealing performance calculation model was built. By applying cubic polynomial to correct contact stress, approximate pressure distribution was obtained. With the inverse method, film thickness was calculated. Finally, the influence of pre-compression, pressure and out velocity on average film thickness, internal leakage and dynamic friction were investigated. The results show that with the increase of the pre-compression, average film thickness and leakage rate decrease, while dynamic friction increases. When pressure increases, average film thickness and leakage rate decrease, but dynamic friction increases. With the increase of out speed, average film thickness, leakage flow rate and dynamic friction also increase. Taking the influence of various factors on wear and leakage into consideration, it is suggested that the lowest pre-compression is 1 mm and the largest velocity is 0.1 m/s when it is used for piston sealing.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2017年第1期91-98,共8页
Journal of Central South University:Science and Technology
基金
湖南省科技专项计划项目(2014FJ1002)
国家高技术研究发展计划(863计划)项目
湖南省战略性新兴产业科技攻关类项目(2016GK4009)~~
关键词
DAS组合密封圈
逆解法
油膜厚度
内泄漏量
动摩擦力
DAS composition seal ring
inverse method
film thickness
leakage flow rate
dynamic friction
作者简介
通信作者：夏毅敏，博士，教授，从事流体传动与控制、掘进设备设计研究；E-mail：xiaymj@csu．edu．cn
