Yx形液压密封圈的有限元分析及结构优化.pdf

2011年7月
润滑与密封
July 2011
第36卷第7期
LUBRICATION ENGINEERING
Vol 36 No.7
DOI:10.3969/ J- issn.0254-0150.201.07.016
Yx形液压密封圈的有限元分析及结构优化
于润生杨秀萍
(天津理工大学机械工程学院天津300384
摘要:应用超弹性理论和非线性理论,采用有限元方法对Yx形液压密封圈的性能进行模拟,分析其失效的位置和
模式,研究参数对密封性能的影响,提出结构优化模型。结果表明:Yx形密封圈工作时最大应力出现在上下唇交汇处,
变形最大区域发生在Yx形开口靠近内唇处,其根部有较大的接触压力,并且可能发生咬伤现象;介质压力增大时,剪
应力和最大接触压力明显增加;最大变形随初始压缩率的增加而线性增大,最大剪应力在压缩率为20%时达到最大;
槽口圆角半径对Yx形密封圈密封性能的影响很小;摩擦因数増大时,最大剪切应力明显增加,但最大变形和最大接触
压力都有减小的趋势。结构尺寸优化后,密封性能增强,接触宽度明显减小,密封圈根部摩擦和磨损得到改善,可以提
高密封圈的使用寿命
关键词:Yx密封圈;非线性;有限元;结构优化
中图分类号:TB42文献标识码:A文章编号:0254-0150(2011)7-066-4
Finite Element Analysis and Optimization Design of
Yx Shape Hydraulic Sealing Ring
Yu Runsheng Yang Xiuping
( School of Mechanical Engineering, Tianjin University of Technology, Tianjin 300384, China)
Abstract: Based on super elasticity theory and nonlinear theory, the performances of Yx shape hydraulic sealing ring
such as the sealing ring deformation, the contact pressure and stress were simulated by finite element method, the failure
position and patterns were analyzed, the effect of parameters on sealing performance were studied, the structure optimization
nodel was put forward. Results show that the biggest stress appears in the intersection of lips, the largest deformation oc-
curs in Yx shape openings near inner lip, and the root of sealing ring has larger contact pressure, which could result in bite
phenomenon. The shear stress and maximum contact pressure increase significantly with the increase of medium pressure
The maximum deformation increases linearly with the increase of initial compression ratio, maximum shear stress reaches to
the maximum when the compression rate is 20%o Notch fillet radius of Yx shape sealing ring has a little effect on seal per-
formance. With the increase of friction coefficient, the maximum shear stress increases significantly, but the maximum de
formation and maximum contact pressure decrease. After structure size optimization, the sealing performance of Yx shape
hydraulic sealing ring is improved, the contact width is decreased greatly, the friction and wear of sealing ring root is im-
proved, and the service life of sealing is prolonged
Keywords: Yx sealing ring; nonlinearity; finite element; structure op
optimization
液压密封圈是液压系统防止泄漏,提高容积效率动的密封。本文作者应用超弹性理论和非线性理论,
技术的迅速发展及工业水平的采用有限元软件 ANSYS对Yx形液压密封圈的性能进
提高,对密封圏的性能和质量要求越来越高。合理的行模拟,分析其失效的位置和模式,研究结构参数和
密封圈结构对提高密封性能和使用寿命具有重要意工作参数对密封性能的影响,提出了结构优化模型并
义。Yx形密封圈依靠其唇边部分受流体压力作用后,进行模拟和分析。
与被密封面紧密接触来进行密封的,主要用于往复运
Yx形橡胶密封圈的计算模型
1.1橡胶材料模型
基金项目:天津市自然科学基金资助项目(033700211)
假设:(1)Yx形密封圈材料具有确定的弹性模
收稿日期:2011-01-10
量E和泊松比;温度变化不大时,材料性质不变;
作者简介:于润生(19835-),男,硕土研究生,研究方向为机(2)Yx形密封圈受到的纵向压缩视为由约束边界的
械设计及理论.E-mail:yrs50lc163.com
指定位移引起的;(3)蠕变不引起体积变化。