摘要
为研究往复泵阀芯复杂运动的规律,基于动网格及UDF方法对阀芯的运动分析与阀隙流场的数值模拟进行耦合,并进一步分析泵阀与柱塞运动的耦合特性,探讨弹簧刚度及预紧力、限位器高度对泵阀运动及性能影响规律.结果表明:弹簧刚度或预紧力越大,阀芯升程越小,阀隙流阻增大,吸入性能降低;弹簧刚度及预紧力对阀芯的滞后及泄漏特性的影响与其对水力效率及吸入性能的影响相反;随着限位器高度逐渐增大,阀芯撞击限位器时速度逐渐减小,阀的滞后高度呈现先减小后增大的趋势,其存在最优取值范围;将往复泵柱塞运动与阀芯运动进行耦合分析,得到弹簧刚度及预紧力对阀座的撞击作用的影响与其对阀芯滞后高度的影响规律基本一致;往复泵示功图可以准确地模拟吸入阀及排出阀的关闭滞后特性.研究结果可为往复泵泵阀的优化设计提供一定的参考.
In order to study the complex motion law of reciprocating pump valve,the motion analysis of the valve core was coupled with the numerical simulation of the flow field in the valve gap using dyna-mic mesh and user-defined functions technology.Furthermore,the coupling characteristics of pump valve and plunger motion were further analyzed,and the influence of the spring stiffness,preload and limiter height on the movement and performance of pump valves were discussed.The results show that the larger the spring stiffness or preload,the smaller the valve lift;the larger the gap flow resistance and the lower the suction performance.The influence of spring stiffness and preload on the action lag and leakage characteristics of valve are opposite to that on hydraulic efficiency and suction perfor-mance.With the increase of the height of limiter,the velocity of the valve core impacting on the limiter decreases gradually,and the lag height of the valve decreases at first and then increases,and there is an optimum range for the height of the limiter.Coupling analysis of plunger motion and valve motion of reciprocating pump,it can be seen that the influence of spring stiffness and preload on the impact of the valve on the valve seat is basically the same as that on the lag height of valve core.The indicator diagram of reciprocating pump can accurately simulate the action lag characteristics of suction valve and discharge valve.The research results can provide some reference for the optimization design of reciprocating pump valve.
作者
张人会
孙鹏程
符义红
ZHANG Renhui;SUN Pengcheng;FU Yihong(College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China;Chongqing Pump Industry Co. Ltd., Chongqing 400037, China)
出处
《排灌机械工程学报》
EI
CSCD
北大核心
2021年第3期217-223,共7页
Journal of Drainage and Irrigation Machinery Engineering
基金
国家自然科学基金资助项目(51979135,51469014)
国家重点研发计划项目(2016YFB0200901)。
关键词
往复泵
阀
弹簧刚度
预紧力
动网格
reciprocating pump
valve
spring stiffness
preload
dynamic mesh
