摘要
在直动式比例阀阀芯的换向过程中,过大的液动力会导致阀芯的换向动作出现滞后甚至卡滞现象,针对这一问题,提出了一种基于阀芯结构优化的液动力补偿方法。首先,采用三维建模软件对直动式比例阀结构进行了三维建模;然后,采用理论推导与计算流体力学(CFD)仿真结合的方法,在阀的开口度和压差改变的情况下,分析了稳态液动力的变化规律;最后,依据液动力动量定理的理论表达式,提出了一种具有液动力补偿功能的阀芯结构,并分析了优化后的阀芯结构对比例阀液动力和流量特性的影响。研究结果表明:在高压、大流量的工作环境中,采用优化的阀芯结构可以更加明显地减小直动式比例阀阀芯所受的液动力;根据全流域液动力仿真结果可知,采用优化后的结构,液动力的最大补偿效果可达45%,可以有效地减小液动力对阀特性的影响,改善比例阀的动态响应性能。
Aiming at the phenomenon that excessive hydraulic force caused the spool reversing lag or even stuck in the process of direct-acting proportional valve spool reversing,a hydraulic force compensation method based on valve spool structure optimization was proposed.Firstly,the three-dimensional modeling software was used to model the structure of the direct-acting proportional valve.Then,by combining theoretical deduction with computational fluid dynamics(CFD)simulation,the variation law of the steady hydraulic force with the valve opening and pressure difference was analyzed.Finally,according to the theoretical expression of the hydrodynamic momentum theorem,a spool structure with hydrodynamic compensation function was proposed,and the influence of the optimized spool structure on the hydrodynamic and flow characteristics was analyzed.The results show that the hydraulic force of the spool can be reduced more obviously by using the optimized spool structure in the high pressure and large flow environment.According to the hydrodynamic simulation results of the whole basin,the maximum compensation effect of hydraulic power can reach 45%,which effectively reduces the influence of hydraulic force on valve characteristics,and has a positive effect on improving the dynamic response of the direct-acting proportional valve.
作者
白俊
赵斌
郝云晓
王波
刘赫
BAI Jun;ZHAO Bin;HAO Yun-xiao;WANG Bo;LIU He(Key Lab of Advanced Transducers and Intelligent Control System of Ministry of Education and Shanxi Province,Taiyuan University of Technology,Taiyuan 030024,China)
出处
《机电工程》
CAS
北大核心
2021年第11期1444-1450,共7页
Journal of Mechanical & Electrical Engineering
基金
国家重点研发计划项目(2019YFB2004502)。
关键词
直动式比例阀
液动力补偿
稳态液动力
阀芯结构优化
direct acting proportional valve
hydrodynamic compensation
steady-state fluid power
valve spool structure optimization
