双阀芯电液比例多路阀流场及阀口特性分析

发布时间：2017-12-30 22:06

本文关键词：双阀芯电液比例多路阀流场及阀口特性分析　出处：《燕山大学》2016年硕士论文　论文类型：学位论文

【摘要】：随着工程机械和数字化技术的发展,智能型工程机械必将成为未来的发展方向。基于负载口独立控制技术的可编程式双阀芯电液比例多路阀作为智能型工程机械一种控制元件,其性能直接影响了整机的操控性、可靠性等性能。因此对双阀芯电液比例多路阀特性展开研究显得十分必要。本文主要从工程应用的角度出发,以某系列双阀芯电液比例多路阀为研究对象,对其内部流场分布以及阀口特性进行理论仿真及实验研究,为国产双阀芯电液比例多路阀的研制提供一定理论基础。综述双阀芯电液比例多路阀国内外研究现状,分析了目前国内对双阀芯电液比例多路阀的研究基础,指出了双阀芯电液比例多路阀流场分布以及阀口特性研究的必要性。对双阀芯电液比例多路阀主阀和先导阀流场分布进行了分析。采用CFD流场仿真技术,分析了主阀和先导阀速度、流线、压力及湍动能等分布情况,并对不同阀口开度和入口流量下主阀和先导阀流场分布以及阀口射流角等关键参数变化规律进行了分析。对主阀和先导阀压降特性、阀口流量系数和稳态液动力进行了分析。对主阀和先导阀阀口过流面积进行了数学解析,分析了不同阀口开度和入口流量下的阀口压降特性,并在此研究基础上对先导阀和主阀流量系数进行了分析。利用CFD壁面积分方法,得到了不同阀口开度和入口流量下主阀和先导阀稳态液动力变化规律。对主阀进口节流时流场分布以及阀口压降特性进行了PIV实验验证。根据相似理论,完成实验模型的设计并搭建了双阀芯电液比例多路阀主阀内部流场2D-PIV可视化实验台,针对不同阀口开度和入口流量下主阀进口节流时内部速度矢量图分布情况以及阀口压降特性进行了实验分析,实验结果与仿真结果基本一致。
[Abstract]:With the development of construction machinery and digital technology, intelligent engineering machinery will become the development direction in the future. The separate control of load port programmable dual spool electro-hydraulic proportional valves as intelligent construction machinery based on a control element, it directly affects the performance of the whole machine control, reliability and other properties. So the double the valve electro-hydraulic proportional valves, it is necessary to investigate the characteristics of this paper. From the view of engineering application, a series of dual spool electro-hydraulic proportional valves, as the research object, theoretical simulation and Experimental Research on the internal flow field distribution and the characteristics of the valve port, to provide a theoretical basis for the development of domestic double spool electro-hydraulic proportional valve. Review of dual spool electro-hydraulic proportional valves, research status, analysis of the current domestic dual spool electro-hydraulic proportional valves based on the The dual spool electro-hydraulic proportional valves and valve flow distribution characteristics of the necessity. The dual spool electro-hydraulic proportional valves, the main valve and pilot valve flow field distribution were analyzed by CFD. The flow field simulation, analysis of the main valve and pilot valve velocity, streamline, distribution of pressure and turbulent kinetic energy, and for different valve opening variation of the key parameters of the main valve and pilot valve and the valve port flow distribution of jet angle and entrance flow are analyzed. The main valve and pilot valve pressure drop characteristics, valve flow coefficient and steady flow force are analyzed. The main valve and pilot valve port flow area mathematical analysis, analysis of different valve opening and entrance flow under the valve pressure drop characteristics, and on the basis of the pilot valve and main valve flow coefficient is analyzed. Using CFD surface integral method, obtained the different valve opening and into the Port flow under the main valve and pilot valve steady flow force variation. The main valve inlet throttle valve pressure drop and flow field distribution characteristics of the PIV experiment. According to the similarity theory, designed and built the experimental model of twin spool electrohydraulic proportional directional valve main valve internal flow visualization experiment platform of 2D-PIV, according to the different valve the opening of entrance flow and the main valve inlet throttle when the internal velocity vector distribution and characteristics of valve pressure drop were analyzed. The experimental results are consistent with simulation results.

【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TH137.52

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