Sealing performance analysis of rubber O-ring in high-pressure gaseous hydrogen based on finite element method
Sealing performance analysis of rubber O-ring in high-pressure gaseous hydrogen based on finite element method
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DOI：
10.1016/j.ijhydene.2017.03.039
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发表时间：
2017-04-20
影响因子：
7.2
通讯作者：
Liu, Pengfei
中科院分区：
文献类型：
--
作者：
Zhou, Chilou;Zheng, Jinyang;Liu, Pengfei
橡胶O形密封圈广泛应用于高压储氢系统中以防止气体泄漏。研究橡胶O形圈在高压氢气环境下的密封特性，对橡胶O形圈密封设计具有重要意义。本文建立了考虑溶氢膨胀的有限元分析模型，研究了橡胶O形圈和楔形圈组合密封结构在高压氢气下的密封性能。分析了楔环、氢压和膨胀对组合密封性能的影响。结果表明，楔环本身可以通过填充槽间的间隙来防止O形圈在超压作用下被挤压，其中45 °角的楔环比30 °和60 °角的楔环更合适。该组合密封结构能随氢气压力的增加自动提高密封能力，接触应力峰值的增加与流体压力的增加呈线性关系。此外，由于溶氢膨胀引起的接触应力峰值升高可提高密封性能，但由于Mises应力的增加，膨胀会加速O形环的机械损伤。(C)2017年氢能出版有限责任公司。由爱思唯尔有限公司出版。保留所有权利。
Rubber O-ring seals have been extensively used in high-pressure hydrogen storage systems for preventing gas leakage. It is important for the design of rubber O-ring seals to clarify the sealing characteristics of the rubber O-ring under high-pressure gaseous hydrogen. In this paper, a finite element analysis model accounting for swelling due to dissolved hydrogen was developed to investigate the sealing performance of the combined seal structure constructed of a rubber O-ring and a wedge-ring under ultrahigh pressure gaseous hydrogen. The effects of wedge-ring, hydrogen pressure, and swelling on the sealing capacity of the combined seal were analyzed. Consequencely, it was found that the wedge ring by itself can prevent the O-ring from extruding under ultrahigh pressure by filling up the clearance between the grooves, and the wedge-ring with the angle of 45 degrees was the most suitable in comparison to those of 30 degrees and 60 degrees. The combined seal structure can enhance automatically the sealing capacity with increasing hydrogen pressure, and the increase of the peak contact stress was linearly proportional to that of the fluid pressure. In addition, the rising peak contact stress induced by swelling due to dissolved hydrogen could result in an improvement in sealing capacity, while the swelling may accelerate the mechanical damage of the O-ring owing to an increase in Mises stress. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.