机械密封摩擦副端面接触分形模型的修正

doi:10.3969/j.issn.0438-1157.2013.05.030

化工学报 ›› 2013, Vol. 64 ›› Issue (5): 1723-1729.DOI: 10.3969/j.issn.0438-1157.2013.05.030

机械密封摩擦副端面接触分形模型的修正

魏龙¹, 顾伯勤², 刘其和¹, 张鹏高^1,2, 房桂芳¹

1. 南京化工职业技术学院, 江苏省流体密封与测控工程技术研究开发中心, 江苏南京210048;
2. 南京工业大学机械与动力工程学院, 江苏南京211816

收稿日期:2012-08-21 修回日期:2012-09-23 出版日期:2013-05-05 发布日期:2013-05-05
通讯作者: 魏龙
作者简介:魏龙(1972-),男,博士,教授。
基金资助:
江苏省"六大人才高峰"资助项目(09-D-018,2010-JXQC-022);江苏省高校科研成果产业化推进项目(JH10-55,JHZD2012-14)。

Correction of contact fractal model for friction faces of mechanical seals

WEI Long¹, GU Boqin², LIU Qihe¹, ZHANG Penggao^1,2, FANG Guifang¹

1. Fluid Sealing Measurement and Control Engineering Research and Development Center of Jiangsu Province, Nanjing College of Chemical Technology, Nanjing 210048, Jiangsu, China;
2. School of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing 211816, Jiangsu, China

Received:2012-08-21 Revised:2012-09-23 Online:2013-05-05 Published:2013-05-05
Supported by:
supported by Jiangsu Planned Projects for Fostering Talents in Six Scientific Fields(09-D-018, 2010-JXQC-022)and College Industrialization Project of Jiangsu Province(JH10-55,JHZD2012-14).

摘要/Abstract

摘要： 分析了原机械密封摩擦副端面接触分形模型存在的问题,并进行了修正,得到了摩擦副端面微凸体承载面积比与端面比压的关系式。修正模型考虑了摩擦副端面间流体膜压的作用、微凸体实际微接触面积与微接触截面积之间的区别,并通过采用一个三次多项式来表达弹塑性变形微凸体的接触压力与接触面积的关系,从而满足了接触微凸体在变形状态转变临界点处的接触面积与接触压力转化皆是连续和光滑的条件。依据修正后的接触分形模型对密封面配对材料为硬质合金YG8-碳石墨M106K的部分平衡型机械密封摩擦副端面微凸体承载面积比的影响因素进行了分析。结果表明,微凸体承载面积比随着弹簧比压的增大近似呈线性增大,随着密封流体压力的增大而非线性单调增大,随着端面分形维数的增大先增大后减小,随着端面特征尺度系数的增大而减小;在正常工作参数范围内,真实接触面积仅占名义接触面积的很小一部分。

关键词: 机械密封, 分形模型, 微凸体承载面积比, 端面比压

Abstract: The existing problems of the original contact fractal model of friction pair faces of mechanical seals were analyzed, and the original model was modified.The relationship between bearing area ratio of asperity and face pressure on the friction pair faces was obtained.In the modified model, the effects of film pressure of fluid between the end faces of friction pair, the differences between real micro contact area and micro contact sectional area of asperity were taken into account.The relationship between elastic-plastic deforming asperity contact pressure and contact area was expressed by a cubic polynomial, which satisfied the continuous and smooth conditions of the transformation of asperity contact area and contact pressure at the critical point of transition of asperity distorting state.According to the modified model, the influence factors of asperity bearing area ratio of friction pair faces matched by cemented carbide YG8-carbon graphite M106K of partial balance mechanical seals were analyzed.The results showed that the asperity bearing area ratio increased approximately linearly with spring pressure, increased monotonously nonlinearly with fluid pressure, increased at first and then decreased with the increase of fractal dimension, and decreased with the increase of characteristic length scale.The real contact area accounts for only a small part of the nominal contact area under normal operating conditions.

Key words: mechanical seal, fractal model, asperity bearing area ratio, face pressure

中图分类号:

TH136

魏龙, 顾伯勤, 刘其和, 张鹏高, 房桂芳. 机械密封摩擦副端面接触分形模型的修正[J]. 化工学报, 2013, 64(5): 1723-1729.

WEI Long, GU Boqin, LIU Qihe, ZHANG Penggao, FANG Guifang. Correction of contact fractal model for friction faces of mechanical seals[J]. CIESC Journal, 2013, 64(5): 1723-1729.

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机械密封摩擦副端面接触分形模型的修正

Correction of contact fractal model for friction faces of mechanical seals

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