ZTS16电液比例阀特性及其应用研究

发布时间：2018-10-19 17:49

【摘要】：随着我国经济高速的发展,工程机械行业发展迅猛,但是工业机械液压系统在控制方面也对设计研发者提出了更高的要求。电液比例阀具有控制精度高,相应速度快等优点,在工程机械中得到广泛应用,国内一度掀起了研制电液比例阀的浪潮,但是对于阀体内部流量特性认识研究不足这一短柄制约着电液比例阀的发展,使得各方面技术落后,研发一直停留在仿制阶段。本文采用理论分析与数值仿真相互结合的方法来弥补国内电液比例阀研制的不足,深入研究了伊顿ZTS16电液比例阀的特性,并对其在挖掘机上的应用进行了探讨,为电液比例阀的研制和应用提供一定的理论依据。文中建立了ZTS16电液比例阀的内部流场三维模型,应用ICEM CFD软件对模型进行网格划分,基于计算流体力学分析软件Fluent对电液比例阀工作时内部的压力场、速度场、速度矢量场和湍动能场进行分析分析,详细地描述了电液比例阀内部的流动特征。利用几何解析法对电液比例阀阀口的过流面积进行了简单的分析计算,确定了过流面积的计算方法。通过计算机仿真得到不同情况下电液比例阀的压降值,研究了油液流经电液比例阀的压降特性,并分析了电液比例阀阀口流量系数。应用理论计算和流场仿真结合的方法解析了电液比例阀的稳态液动力,得到稳态液动力特性曲线,对电液比例阀的控制研究具有一定的指导意义。详细分析传统挖掘机的工作原理及其部分功能回路,参照ZTS16电液比例阀组成的阀控单元以及挖掘机的性能参数搭建了挖掘机液压控制模块系统的AMEsim模型,验证了挖掘机的液压控制模块系统在操作过程中实现流量再生以及流量优先功能的可能性。本文通过对ZTS16电液比例阀特性的研究,优化了电液比例阀的结构、确保实现精确化控制流量、降噪、节能以及准确匹配阀芯驱动系统等特性,为研究提供了一定的理论指导。为研究电液比例阀的应用和特性找到了一条新的思路,缩短了研发周期,很大程度上降低了电液比例阀研制的成本,也为比例阀的研究设计提供了理论参考。
[Abstract]:With the rapid development of China's economy, the construction machinery industry is developing rapidly, but the hydraulic system of industrial machinery has put forward higher requirements for the design and development of the hydraulic system in the aspect of control. The electro-hydraulic proportional valve has the advantages of high control precision and high speed, and has been widely used in construction machinery. At one time, the development of electro-hydraulic proportional valve was raised in China. However, the lack of understanding of the internal flow characteristics of valve body is a short handle that restricts the development of electro-hydraulic proportional valve, which makes the technology lag behind, so the research and development has been stuck in the imitation stage. In this paper, the method of combining theoretical analysis with numerical simulation is used to make up for the shortage of the development of electro-hydraulic proportional valve in China. The characteristics of Eaton ZTS16 electro-hydraulic proportional valve are studied in depth, and its application in excavator is discussed. It provides some theoretical basis for the development and application of electro-hydraulic proportional valve. In this paper, a three-dimensional model of the internal flow field of ZTS16 electro-hydraulic proportional valve is established. The model is meshed with ICEM CFD software. The pressure field and velocity field of the electro-hydraulic proportional valve are analyzed based on the computational fluid dynamics analysis software Fluent. The velocity vector field and turbulent kinetic energy field are analyzed and the flow characteristics inside the electro-hydraulic proportional valve are described in detail. The over flow area of electro-hydraulic proportional valve is analyzed and calculated by geometric analysis method, and the calculation method of overcurrent area is determined. The pressure drop of electro-hydraulic proportional valve under different conditions was obtained by computer simulation. The pressure drop characteristics of oil flow through electro-hydraulic proportional valve were studied and the flow coefficient of electro-hydraulic proportional valve outlet was analyzed. The steady-state hydraulic power of electro-hydraulic proportional valve is analyzed by using the method of theoretical calculation and flow field simulation, and the steady-state hydraulic dynamic characteristic curve is obtained, which is of certain guiding significance to the study of electro-hydraulic proportional valve control. The working principle and some functional circuits of the traditional excavator are analyzed in detail. The AMEsim model of the hydraulic control module system of the excavator is built according to the valve control unit composed of the ZTS16 electro-hydraulic proportional valve and the performance parameters of the excavator. It is proved that the hydraulic control module system of excavator can realize flow regeneration and flow priority function during operation. Through the study of the characteristics of ZTS16 electro-hydraulic proportional valve, the structure of electro-hydraulic proportional valve is optimized to ensure accurate flow control, noise reduction, energy saving and accurate matching of valve core drive system, which provides a certain theoretical guidance for the research. A new way of thinking is found for studying the application and characteristics of electro-hydraulic proportional valve, which shortens the research and development cycle, reduces the cost of the development of electro-hydraulic proportional valve to a great extent, and provides a theoretical reference for the research and design of proportional valve.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TH137.52

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