基于三维接触的滑环式旋转组合密封性能主控因素分析

摘要/Abstract

摘要： 密封圈二维有限元分析中，常将密封圈接触面上最大接触压力推广到整个接触面上，针对这种不够精确的方法，提出了一种基于三维仿真模型的有效接触压力高精度计算方法。建立组合密封圈的三维模型，模拟实际工况，对影响其动密封特性的轴往复运动速度、轴转速、介质压力、O形圈压缩量、滑环厚度、滑环动接触面开槽进行了研究，并利用有效接触压力计算方法分析了动接触面上有效接触压力的分布情况。结果表明：滑环开槽、滑环厚度、O形圈压缩量以及介质压力对组合密封圈有效接触压力影响较大，内轴往复速度以及转速达到一定值后对有效接触压力影响较大。研究结果为滑环式组合密封圈的优化设计提供了参考。

关键词: 组合密封, 有效接触压力, 有限元分析, 主控因素分析

Abstract: The calculation which applied the traditional 2D FEA to generalize the maximum contact stress on a single-contact line of the sealing ring to the whole contact surface was not an accurate algorithm. In view of it, a more accurate and effective contact stress calculation method was proposed based on the 3D simulation model herein. Some different 3D models of the combined sealing ring were established through simulating the actual working conditions, and the method was used to analyze the effective contact stress distribution under the different effect factors of the dynamic seal characteristics, such as the reciprocating motion speeds, the revolving speeds, the medium pressures, the O-ring compressions, the thicknesses of the slip rings and the slottings on the moving contacts. The results show that the slottings on the moving contacts, the thicknesses of the slip ring, the O-ring compressions and the medium pressures have a great influence on the values of effective contact stresses; when the reciprocating motion speeds and the revolving speeds of inner shaft exceed a critical value, they have an influence on the values of the effective contact stresses. The results of this paper provide a reference for the optimization design of slip ring combined seals.

Key words: combined seal, effective contact stress, finite element analysis(FEA), analysis of main influence factor

中图分类号:

TH136

祝效华;敬洋. 基于三维接触的滑环式旋转组合密封性能主控因素分析[J]. 中国机械工程.

ZHU Xiaohua;JING Yang. Analysis of Main Influence Factors for Slip Ring Combined Rotating Seals Based on 3D Contact[J]. China Mechanical Engineering.

参考文献

[1]谭晶，杨卫民，丁玉梅，等.滑环式组合密封件的研究(Ⅰ)——方形同轴密封件(格来圈)的分析[J].润滑与密封，2007，32(1)：53-55.
TAN Jing，YANG Weimin，DING Yumei，et al. The Study of a Sliding Ring Combined Seal Ring(Ⅰ)—The Analysis of Rectangle Co-Axia Seal[J].Lubrication Engineering，2007，32(1)：53-55.

[2]FRLICH D，MAGYAR B，SAUER B. A Comprehensive Model of Wear, Friction and Contact Temperature in Radial Shaft Seals[J].Wear，2014，311(1/2)：71-80.

[3]陈国定，HAISER H，HAAS W，等.O形密封圈的有限元力学分析[J].机械科学与技术，2000，19(5)： 740-742.
CHEN Guoding，HAISER H，HAAS W，et al. Analysis of Elastomeric O-ring Seals Using the Finite Element Method[J].Mechanical Science and Technology，2000， 19(5)：740-742.

[4]FIRED I，JOHONSON A R. Nonlinear Computation of Axisymmetric Solid Rubber Deformation[J].Computer Methods in Applied Mechanics and Engineering，1998,67(2)：241-253.

[5]NIKAS C K. Elastohydrodynamics and Mechanics of Rectangular Elastomeric Seals for Reciprocating Piston Rods[J]. Journal of Tribology，2003,125(1)：60-69.

[6]GEORGE K, NIKAS C K, RICHARD S，et al. Computational Model of Tandem Rectangular Elastomeric Seals for Reciprocating Motion[J].Tribology International，2006，39 (1)：622-634.

[7]PROKOP J，MULLER H K. Film Thickness, Contact Pressure and Friction of PTFE Rod Seals[C]//12th International Conference on Fluid Sealing. Brighton,1989:147-163.

[8]SLALANT R F，MASER N，YANG B. Numerical Model of a Reciprocating Hydraulic Rod Seal[J]. Journal of Tribology, 2007，129(1)：91-97.

[9]RUSKELL L E. A Rapidly Converging Theoretical Solution of the Elastohydrodynamic Problem for Rectangular Rubber Seals[J]. Journal of Mechanical Engineering Science，1980，22(1)：9-16.
[10]王伟，赵树高.橡胶O形密封圈的接触变形及应力分析[J].弹性体，2005，15(4)：28-31.
WANG Wei，ZHAO Shugao. Analysis on Contact Deformation and Stress for Rubber O-sealing Ring [J].China Elastomerics，2005，15(4)：28-31.

[11]谭晶，杨卫民，丁玉梅，等.O形橡胶密封圈密封性能的有限元分析[J].润滑与密封，2006(9)：65-69.
TAN Jing，YANG Weimin，DING Yumei，et al. Finite Element Analysis of the Sealing Performance of O-ring Seal Structure[J]. Lubrication Engineering，2006(9)：65-69.

[12]黄中华，金波，刘少军.深海高压舱密封性能评价研究[J].浙江大学学报(工学版)，2007，41(5)：790-793.
HUANG Zhonghua，JIN Bo，LIU Shaojun. Sealing Performance Evaluation of Deep Sea High Pressure Cabin[J].Journal of Zhejiang University(Engineering Science)，2007，41(5)：790-793.

[13]MAO J F，WANG W Z，LIU Y Z. Experimental and Theoretical Investigation on the Sealing Performance of the Combined Seals for Reciprocating Rod [J].Journal of Mechanical Science and Technology，2012，26(6)：1765-1772.

[14]赵河明，韩宁.动态压力下旋转动密封结构有限元分析[J].现代制造工程，2014(10)：81-85.
ZHAO Heming，HAN Ning. Finite Element Analysis of Rotary Sealing of O-ring[J].Modern Manufacturing Engineering，2014(10)：81-85.

[15]KIM H K，NAM J H，HAWONG J S，et al. Evaluation of O-ring Stresses Subjected to Vertical and one Side Lateral Pressure by Theoretical Approximation Comparing with Photo Elastic Experimental Results[J]. Engineering Failure Analysis，2009,16(6)：1876-1882.

[16]KIM H K，PARK S H，LEE H G，et al. Approximation of Contact Stress for a Compressed and Laterally One Side Restrained O-ring[J].Engineering Failure Analysis，2007,14(8)：1680-1692.