文章摘要
杨开林.先导活塞式泄压阀的运动规律[J].水利学报,2019,50(9):1039-1051
先导活塞式泄压阀的运动规律
Motion law of pilot piston pressure relief valve
投稿时间:2019-02-12  
DOI:10.13243/j.cnki.slxb.20190093
中文关键词: 泄压阀  导阀  活塞  运动方程  启闭规律
英文关键词: pressure relief valve  pilot valve  piston  motion equation  opening and closing law
基金项目:国家重点研发计划课题(2016YFC0401808);国家自然科学基金项目(51609265);中国水科院科研专项(HY0145B802017)
作者单位
杨开林 流域水循环模拟与调控国家重点实验室 中国水利水电科学研究院, 北京 100038 
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中文摘要:
      先导活塞式泄压阀是一种新型的防水击危害的安全阀,但理论研究尚不成熟。本文系统地考虑了影响先导活塞式泄压阀运动的各方面因素,包括水压力、运动部件的重力、弹簧力、活塞环摩阻力和渗漏等,基于结构运动力学和水力学原理,得到了主阀启闭速度与液压传动系统流量的函数关系,建立了描述主阀启闭速度与时间关系的运动方程。然后,通过对主阀关闭运动方程的解析,修正了现有活塞渗漏流量的计算公式,提出了合理选择活塞直径与主阀瓣直径以减小水压变化对关闭过程影响的方法,进而解析得出主阀关闭速度、行程、关闭时间的计算公式。最后,通过数值实例检验了解析式的准确性,并计算分析了一些关键参数对泄压阀开启和关闭的影响。本文主阀运动规律也适用于活塞式压力波动预止阀。
英文摘要:
      The pilot piston pressure relief valve is a new type of safety valve which can prevent the damage caused by water hammer, but the theoretical research is not yet mature. In this paper, various factors affecting the movement of the pilot piston relief valve are systematically considered, including water pressure, gravity of moving parts, spring force, piston ring friction force and leakage. Based on the principles of structural motion mechanics and hydraulics, the functional relationship between the opening and closing speed of the main valve and the pipeline flow rate of the hydraulic transmission system is obtained, and the mathematical models of the opening and closing speed, stroke and time of the main valve are established. Then, through the analysis of the closing motion equation of the main valve, the existing calculation formula of piston leakage flow is revised, and a method of reasonably selecting the diameter of piston and the diameter, of main valve disc to reduce the influence of water pressure change on the closing process is put forward. Then the calculation formula of main valve closing speed, stroke and closing time are obtained analytically. Finally, the accuracy of the analytical formula is verified by numerical examples, and the effects of some key parameters on the opening and closing of the relief valve are calculated and analyzed. The motion law of the main valve in this paper is also applicable to the piston type pressure fluctuation pre-stop valve.
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