摘要
针对常用阀杆填料密封环及配合间隙设计方法无法满足高压球阀工况要求的问题,根据高压氢气球阀的结构与填料受力特征,对球阀内部流场特性及密封结构进行研究,考察了不同石墨填料高度、压缩率、摩擦系数、配合间隙对阀杆密封性能的影响规律。结果表明,阀门关闭过程中的最大流速发生在阀芯通道出口处,为32.4 m/s;填料环流固交界面处压力波动为13 700 Pa,流速在0~4 m/s范围内,对密封设计影响可以忽略,而压缩率、配合间隙对密封性能的影响则比较大。摩擦系数的增加可以有效提升接触压力,但会加剧密封环磨损。综合考虑,确定最优填料密封环尺寸为总高度20 mm、配合间隙0.1 mm、压缩率22%、摩擦系数0.1,搭建阀杆密封性能试验机,验证了该密封结构在常温和45 MPa高压下的密封性能(无泄漏),证实了设计的可靠性。研究结果可为高压球阀阀杆填料密封的设计提供参考。
To address the inadequacy of conventional stem packing seal ring and clearance design methods for high-pressure ball valves,this study investigates internal flow characteristics and sealing structures based on the configuration and mechanical behavior of high-pressure hydrogen ball valve packings.The effects of graphite packing height,compression ratio,friction coefficient,and clearance on stem sealing performance were examined.Results show that during valve closure,the maximum flow velocity(32.4 m/s)occurs at the spool channel outlet.At the fluid-solid interface of the packing ring,pressure fluctuation is 13700 Pa with flow velocity ranging 0~4 m/s,negligible for sealing design,while compression ratio and clearance significantly impact sealing performance.Increased friction coefficient enhances contact pressure but accelerates seal ring wear.Optimized parameters were determined:total height 20 mm,clearance 0.1 mm,compression ratio 22%,friction coefficient 0.1.A stem sealing test rig verified leak-free performance under room temperature and 45 MPa high pressure,confirming design reliability.This study provides reference for designing stem packing seals in high-pressure ball valves.
作者
偶国富
李志豪
金浩哲
陈凤官
刘骁飞
陈贤洮
梁春雷
刘鹏
OU Guofu;LI Zhihao;JIN Haozhe;CHEN Fengguan;LIU Xiaofei;CHEN Xiantao;LIANG Chunlei;LIU Peng(The Institute of Flow‑Induced Corrosion,Changzhou University,Changzhou 213164,China;The Institute of Flow‑Induced Corrosion,Zhejiang Sci-Tech University,Hangzhou 310018,China;Hefei General Machinery Research Institute Co.,Ltd.,Hefei 230031,China;Ningxia Special Equipment Inspection and Testing Institute,Yinchuan 750010,China)
出处
《流体机械》
北大核心
2025年第5期30-39,共10页
Fluid Machinery
基金
国家自然科学基金项目(52176048)
国家自然科学基金项目(U1909216)
浙江省“尖兵”“领雁”科技计划项目(2024C03122)。
