复合运动下冲击活塞杆斯特封磨损寿命预测  

Wear Life Prediction of Impact Piston Rod Step Seal Under Compound Motion

作　　者：柳毅 谢良喜[1] 侯军 LIU Yi;XIE Liangxi;HOU Jun(College of Machinery and Automation,Wuhan University of Science and Technology,Wuhan,Hubei 430081)

机构地区：[1]武汉科技大学机械自动化学院,湖北武汉430081

出　　处：《液压与气动》2024年第9期41-46,共6页Chinese Hydraulics & Pneumatics

基　　金：国家自然科学基金(51375352)。

摘　　要：磨损是引发密封失效的主要因素之一。针对复合运动的冲击活塞杆斯特封进行磨损寿命预测研究,活塞杆复杂的运动方式导致传统实验方法操作复杂、成本高。基于实际工况建立往复回转密封磨损寿命预测模型,对斯特封密封结构进行有限元分析,得到滑环唇口节点坐标值以及接触压力分布,综合考虑复合运动,模拟唇口轮廓、接触压力和接触长度随磨损时间累加的演化过程,并以密封面接触压力小于最大工作油压作为判断密封圈失效依据,实现斯特封的磨损寿命预测;最后通过实验证明寿命预测的准确性。结果表明:随着磨损时间的累积,磨损速率逐渐减小,最大接触压力表现出先快速降低后缓慢降低的趋势,在该工况下的磨损寿命为64.8~70.2 h。Wear is one of the main factors that causes seal failure.To predict the wear life of piston rod step seal with complex motion,the complex motion mode of piston rod leads to the complexity and high cost of traditional experimental methods.Based on the actual working condition,the wear life prediction model of reciprocating rotary seal is established,and the finite element analysis of the seal structure of the step seal is carried out to obtain the node coordinates and contact pressure distribution of the slip ring lip.Comprehensive consideration of composite motion,the evolution process of the lip profile,contact pressure and contact length with the wear time is simulated,and the failure of the seal ring is judged according to the contact pressure of the seal surface being less than the maximum working oil pressure,and the wear life prediction of the step seal is realized.The results show that the wear rate decreases gradually with the wear time accumulation,the maximum contact pressure decreases rapidly at first and then slowly,and the wear life under this condition is 64.8~70.2 h.

关 键 词：斯特封 复合运动 往复回转 磨损寿命 

分 类 号：TH137[机械工程—机械制造及自动化]