O形密封圈沟槽底角对密封性能的影响
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摘要
基于三重非线性理论,运用ANSYS Workbench软件,研究O形密封圈沟槽底角对密封性能的影响。在沟槽底角a分别取80°、90°和100°的条件下,仿真分析了介质压力和摩擦系数变化时O形圈的Von Mises应力和接触压力分布情况,以此为O形圈密封性能的判定依据。结果表明,在一定的初始压缩率(ε=15%)和摩擦系数(f=0.1)条件下,沟槽底角不同时O形密封圈的最大Von Mises应力和最大接触压力都随着介质压力的升高而增大,其中a=80°和a=100°时的Von Mises应力变化基本相同,且始终大于a=90°时的对应值;与其他两种沟槽底角相比,a=100°时O形圈主密封面上的最大接触压力较大,密封性能更好;在一定介质压力下,沟槽底角不同时O形密封圈在3个密封面上的最大接触压力都随着摩擦系数的增大而先降后升,但始终大于介质压力,从而可以确保其密封性能良好。
Based on triple nonlinear theory, the influence of groove bottom angle of O-ring on its sealing performance was studied by using ANSYS Workbench software. Under the condition that the groove bottom angle a is 80°, 90° and 100°, respectively, the distributions of Von Mises stress and contact pressure of O-rings were analyzed with the changing of medium pressure and friction coefficient, and then were taken as the criteria of O-ring's sealing performance. Simulation results show that, when the initial compression ratio ε=15% and friction coefficient f=0.1, the maximum Von Mises stress and contact pressure of O-rings at different groove bottom angles increase with increasing medium pressure, and Von Mises stress values at a=80° and a=100° are almost the same, which are always larger than that at a=90°. The maximum contact pressure on the main sealing surface is higher and the sealing performance is better when a=100°. Under a certain medium pressure, the maximum contact pressures on all three sealing surfaces of O-rings at different groove bottom angles drop at first and then rise with increasing friction coefficient, but are always higher than the medium pressure, which can ensure the good sealing performance of O-rings.
Based on triple nonlinear theory, the influence of groove bottom angle of O-ring on its sealing performance was studied by using ANSYS Workbench software. Under the condition that the groove bottom angle a is 80°, 90° and 100°, respectively, the distributions of Von Mises stress and contact pressure of O-rings were analyzed with the changing of medium pressure and friction coefficient, and then were taken as the criteria of O-ring's sealing performance. Simulation results show that, when the initial compression ratio ε=15% and friction coefficient f=0.1, the maximum Von Mises stress and contact pressure of O-rings at different groove bottom angles increase with increasing medium pressure, and Von Mises stress values at a=80° and a=100° are almost the same, which are always larger than that at a=90°. The maximum contact pressure on the main sealing surface is higher and the sealing performance is better when a=100°. Under a certain medium pressure, the maximum contact pressures on all three sealing surfaces of O-rings at different groove bottom angles drop at first and then rise with increasing friction coefficient, but are always higher than the medium pressure, which can ensure the good sealing performance of O-rings.
引文
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[2] Zhang H,Zhang J.Static and dynamic sealing per- formance analysis of rubber D -ring based on FEM [J].Journal of Failure Analysis and Prevention,2016,16(1):165-172.
[3] Zhou C L,Zheng J Y,Gu C H,et al.Sealing performance analysis of rubber O-ring in high-pressure gaseous hydrogen based on finite element method[J].International Journal of Hydrogen Energy,2017,42(16):11996-12004.
[4] 尚付成,饶建华,沈钦凤,等.超高液压下O形橡胶密封圈的有限元分析[J].液压与气动,2010(1):67-70.
[5] 杜晓琼,陈国海,闫晓亮,等.考虑安装过程的O形密封圈有限元分析模型[J].液压与气动,2017(10):27-33.
[6] Zhang J,Xie J X.Investigation of static and dynamic seal performances of a rubber O-ring[J].Journal of Tribology,2018,140(4):042202.
[7] Hou M,Su M,Liu Y W,et al.Analysis of a dovetail O-ring groove performance[J].Sealing Technology,2010(8):9-12.
[8] 刘江.ANSYS 14.5 Workbench机械仿真实例详解[M].北京:机械工业出版社,2015.
[9] 黄志新,刘成柱.ANSYS Workbench 14.0超级学习手册[M].北京:人民邮电出版社,2013.
[10] 宋强,范华涛,罗升,等.深海舷外电液舵机的密封性能分析[J].船舶工程,2018,40(1):6-11,70.
[11] 车毅力.有限元分析在O形密封圈静密封应力分析中的应用[J].液压气动与密封,2013(11):77-78,47.