深海高压环境下O形密封圈密封性能分析
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摘要
针对深海高压环境密封壳体用O形密封圈研究不足问题,对O形密封圈在不同压缩率、不同硬度、高介质压力下接触应力大小及应力分布情况等方面进行了研究。对判断O形密封圈失效的方法进行了归纳,提出了基于失效准则判断O形密封圈在深海中所能承受最大压力的方法,利用非线性有限元分析方法进行了分析及预测。研究结果表明:压缩率及材料硬度对O形密封圈的密封能力有重要影响,介质压力的变化会引起O形密封圈内部应力分布的变化;材料硬度为90HA的丁腈橡胶O形密封圈在压缩率为21%的工况中,可以满足5 000 m水深的密封要求。
Aiming at insufficient research on O-ring seals for sealed shell in deep sea and high pressure environment,the contact stress and stress distribution of O-ring seals under different compression ratio,different hardness and high medium pressure were studied. The method of judging the failure of the O-ring seals was summarized. A method based on failure criteria to determine the maximum pressure of O-ring seals in deep sea was proposed. Nonlinear finite element analysis methods were used for analysis and prediction. The results indicate that the compression rate and material hardness has an important influence on the sealing ability of the O-ring seals. The change of medium pressure can cause the change of internal stress distribution in the O-ring seals. Nitrile rubber O-ring with material hardness of 90 HA can meet the sealing requirement of 5000 meters water depth under 21% compression condition.
Aiming at insufficient research on O-ring seals for sealed shell in deep sea and high pressure environment,the contact stress and stress distribution of O-ring seals under different compression ratio,different hardness and high medium pressure were studied. The method of judging the failure of the O-ring seals was summarized. A method based on failure criteria to determine the maximum pressure of O-ring seals in deep sea was proposed. Nonlinear finite element analysis methods were used for analysis and prediction. The results indicate that the compression rate and material hardness has an important influence on the sealing ability of the O-ring seals. The change of medium pressure can cause the change of internal stress distribution in the O-ring seals. Nitrile rubber O-ring with material hardness of 90 HA can meet the sealing requirement of 5000 meters water depth under 21% compression condition.
引文
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[17]张毅,王国志,刘恒龙,等.深海液压动力源O形圈密封性能分析[J].液压与气动,2014(8):23-25.
[2]张婧,金圭. O形密封圈接触压力的有限元分析[J].润滑与密封,2010,35(2):80-83.
[3]刘健,仇性启,薄万顺,等.橡胶O形密封圈最大接触压力数值分析[J].润滑与密封,2010,35(1):41-44.
[4]王国志,张毅,刘桓龙,等.深海环境下的O形圈静密封设计[J].润滑与密封,2014,39(10):88-91.
[5]顾东升,涂桥安,孙见君,等.丁腈橡胶O形圈密封性能试验研究[J].润滑与密封,2015,40(8):71-75.
[6]周博,陈家旺,顾临怡,等.深海高压环境下的密封材料变形特性分析[J].中国机械工程,2010,21(12):1481-1484.
[7] YEOH O H. Characterization of elastic properties of carbon black filled rubber vulcanization[J]. Rubber Chemical and Technology,1990,63(5):792-805.
[8]刘萌,王青春,王国权.橡胶Mooney-Rivlin模型中材料常数的确定[J].橡胶工业,2011,58(4):241-245.
[9]王朝晖,何康康. O形橡胶密封圈的非线性有限元分析[J].制造技术研究,2016,4(2):4-8.
[10]郝木明,李振涛,任宝杰,等.机械密封技术及应用[M].2版.北京:中国石化出版社,2014.
[11]闻邦椿.机械设计手册[M]. 5版.北京:机械工业出版社,2007.
[12]刘鹏,宋文杰,蒋庆林,等.深海高压环境下O形密封圈的密封性能研究[J].液压与气动,2017(4):66-70.
[13]秦亚军.基于有限元的O形橡胶圈密封性能分析[J].液压气动与密封,2014(8):31-33.
[14]周新蓉,吴晨晖,丁巍.安全壳闸门用O形密封圈非线性有限元分析[J].中国新技术新产品,2018(1):37-39.
[15]孙宪栋,善绪强,李双喜.机械密封覆层端面开裂有限元分析[J].流体机械,2018(10):29-34.
[16]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(5):27-33.
[17]张毅,王国志,刘恒龙,等.深海液压动力源O形圈密封性能分析[J].液压与气动,2014(8):23-25.