【摘要】 低温阀瓣作为控制低温介质流动的关键组件，其密封性能直接影响到系统的安全和效率。研究了低温阀瓣的软密封性能，特别关注聚三氟氯乙烯(PCTFE)软密封材料从室温(300 K)到极低温条件下(77 K)的适用性。通过有限元分析方法，分析了阀瓣密封压力、阀座与密封垫初始接触宽度和低温介质压力对密封面接触应力分布及泄漏量的影响。研究发现，密封压力从2.5 MPa增加到5.0 MPa时，平均接触应力显著提升，显示出接触应力对密封压力的显著正相关性，但随着密封压力增大边缘效应更为显著，应力集中现象增强；随着密封宽度从1.5 mm增加到3.5 mm,接触应力的均匀性得到显著改善，但是泄漏量显著增加；介质压力从0.5 MPa提高到1.5 MPa,导致平均接触应力剧烈降低以及泄漏量增加，强调了适当的介质压力在维持良好密封性能中的重要性。研究结果为低温阀门的设计和优化提供了重要的工程应用价值，确保了低温介质的安全有效应用。更多还原

【Abstract】 Low-temperature valve discs, as critical components for controlling the flow of cryogenic media, directly impact the safety and efficiency of the system. This paper investigates the soft sealing performance of low-temperature valve discs, with a particular focus on the applicability of polychlorotrifluoroethylene(PCTFE) soft sealing material from room temperature(300 K) to extremely low temperature conditions(77 K). Finite element analysis methods were employed to analyze the impact of valve disc sealing pressure, the initial contact width between the valve seat and the sealing pad and the pressure of the cryogenic medium on the distribution of contact stress and leakage on the sealing surface. The study found that as the sealing pressure increased from 2.5 MPa to 5.0 MPa, the average contact stress significantly increased, demonstrating a strong positive correlation between contact stress and sealing pressure. However, the edge effect became more pronounced and the stress concentration phenomenon intensified with increased sealing pressure. As the sealing width increased from 1.5 mm to 3.5 mm, the uniformity of contact stress significantly improved, but the leakage amount also significantly increased. An increase in the medium pressure from 0.5 MPa to 1.5 MPa led to a sharp decrease in the average contact stress and an increase in leakage, emphasizing the importance of appropriate medium pressure in maintaining good sealing performance. The findings of this study provide significant engineering application value for the design and optimization of low-temperature valves, ensuring the safe and effective use of cryogenic media.更多还原