Abstract
The charge valve is an important element in the charging port of a high-pressure hydrogen storage cylinder (HP-HSC). It is normally closed after the HP-HSC is filled with hydrogen. If the seal of the charge valve is damaged, it will seriously affect the stable operation of the hydrogen supply system and may even cause safety problems. Therefore, the seal performance of the charge valve is important. In this paper, finite element analysis (FEA) is carried out to analyze the seal contact performance of hydrogenated nitrile rubber (HNBR) gaskets in the seal pair of a charge valve. The effects of different pre-compressions, seal widths, and hydrogen pressures on the seal contact performance of the charge valve are analyzed. The contact pressure on the seal surface increases with the increase of pre-compression. With a pre-compression of 2.5 mm, the maximum contact pressure without and with hydrogen pressure are 68.51 and 107.38 MPa, respectively. A contact gap appears in the inner ring of the seal surface with pre-compression below 0.15 mm. The contact gap occurs between the entire seal surface with a seal width of 1 mm. The contact pressure on the seal surface and the width of the separation area between the seal surfaces increase with the increase of the seal width. The contact gap between the seal surfaces is zero with a width of 2.5 mm. The width of the separation area between the seal surfaces decreases with the decrease of the hydrogen pressure. The width of the separation area is reduced from 0.5 mm at 35 MPa to 0.17 mm at 15 MPa. This work can be useful for improvement of the seal performance and of the design of the charge valve used in the HP-HSC.
概要
目的:充氢阀阀座良好的软密封性能是保障高压储氢瓶氢气不泄漏的一个关键因素。本文旨在探讨密封预压缩量、密封宽度和氢气压力对软密封元件接触压力和接触间隙的影响规律。 创新点:建立非线性有限元分析模型,在不同预压缩量、密封宽度和氢气压力下对密封接触特性进行动态分析。 方法:1. 建立不同预压缩量的数值模型,比较分析在不同密封预压缩量下接触间隙和接触压力在密封面上的分布(图6);2. 建立不同密封宽度的数值模型,对比分析在不同密封宽度下密封间隙和密封压力的动态变化过程(图9);3. 改变氢气压力值,比较在不同氢气压力下软密封的应力强度和接触特性(图10和11)。 结论:1. 密封面上的接触压力随着预压缩量的增加而增大;当预紧压缩量减小到一定值时会出现接触间隙大于零的区域。2. 随着密封宽度的增加,密封面上的接触压力和密封面之间分离区域的宽度也随之增加。3. 随着氢气压力的降低,密封面之间的分离区域的宽度相应减小。
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Acknowledgments
This work is supported by the National Natural Science Foundation of China (No. 52175067), the Science and Technology Department of Zhejiang Province (No. 2021C01021), China, and the Young Elite Scientist Sponsorship Program by China Association for Science and Technology (No. YESS20200154).
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Zhen-hao LIN and Jin-yuan QIAN designed the research. Zhen-hao LIN, Long-jie YU, and Ting-feng HUA processed the corresponding data. Zhen-hao LIN wrote the first draft of the manuscript. Long-jie YU and Ting-feng HUA helped to organize the manuscript. Zhi-jiang JIN and Jin-yuan QIAN revised and edited the final version.
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Zhen-hao LIN, Long-jie YU, Ting-feng HUA, Zhi-jiang JIN, and Jin-yuan QIAN declare that they have no conflict of interest.
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Lin, Zh., Yu, Lj., Hua, Tf. et al. Seal contact performance analysis of soft seals on high-pressure hydrogen charge valves. J. Zhejiang Univ. Sci. A 23, 247–256 (2022). https://doi.org/10.1631/jzus.A2100395
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DOI: https://doi.org/10.1631/jzus.A2100395
Key words
- Charge valve
- Seal contact performance
- High-pressure hydrogen storage cylinder (HP-HSC)
- Finite element analysis (FEA)