径向柱塞泵内流道流场分析及配流轴结构优化

发布时间：2019-02-28 13:02

【摘要】：径向柱塞泵是一种高效节能新型液压泵，它具有结构简单、使用寿命长、工作压力高等优点，已广泛应用于矿山机械、起重机械、锻压机械等液压传动系统中。随着计算机技术和数值模拟技术的快速发展，应用CFD技术对液压元件内部流体流动现象进行仿真研究已成为一项普遍应用的工程分析手段，通过研究内部流场规律来提高泵的综合性能具有重要的工程意义。本文利用CFD方法，对40ml/r径向柱塞泵的内流道非定常流场进行数值模拟仿真研究，主要内容如下：（1）详细阐述了径向柱塞泵的结构、工作原理和运动分析，然后结合流体流动控制方程，，建立其流动的三维数学模型。依据计算得出的数据，利用Pro/E绘图软件建立泵内流道的三维物理模型。（2）将前面建立完成的内流道三维模型导入Fluent前处理软件Gambit，结合模型的结构特征，选择非结构网格方式分步骤对其进行网格划分，并对精密的三角槽部位进行网格细化。（3）应用Fluent的动网格技术和滑移网格技术对径向柱塞泵内流道网格模型进行参数设置和数值仿真分析。选取标准k-ε模型分析了单个柱塞腔内的压力冲击和压力振荡以及径向柱塞泵出口的流量脉动情况；对配流轴三角槽两棱夹角分四种角度进行了分析研究，得到较合理的三角槽结构为90°的等腰三角形；在配流轴三角槽两棱夹角取90°的结构下对径向柱塞泵进行了变工况的数值模拟和分析研究,得到了压力冲击和压力振荡与负载压力和主轴转速之间的关系。（4）配流轴与柱塞的遮盖结构中采用了负遮盖情况，仿真分析了三种不同的负遮盖形式对压力和流量的影响作用，最终得到在径向柱塞泵的结构设计中可以参考负遮盖结构。综上所述，通过对径向柱塞泵内流道的流场分析及配流轴的结构研究，以寻求径向柱塞泵性能最佳状态时的结构参数，为改善泵的性能和内流道优化设计提供了一定的参考依据。
[Abstract]:Radial plunger pump is a new type of hydraulic pump with high efficiency and energy saving. It has the advantages of simple structure, long service life and high working pressure. It has been widely used in hydraulic transmission systems such as mine machinery, lifting machinery, forging machinery and so on. With the rapid development of computer technology and numerical simulation technology, the application of CFD technology in the simulation of fluid flow phenomena in hydraulic components has become a widely used engineering analysis method. It is of great engineering significance to improve the comprehensive performance of pump by studying the law of internal flow field. In this paper, the unsteady flow field in the inner channel of 40ml/r radial piston pump is simulated by CFD method. The main contents are as follows: (1) the structure, working principle and motion analysis of radial piston pump are described in detail. Then, the three-dimensional mathematical model of fluid flow is established by combining the governing equation of fluid flow. According to the calculated data, the three-dimensional physical model of the flow channel in pump is established by using Pro/E drawing software. (2) the 3-D model of internal runner established before is imported into Fluent pre-processing software Gambit, combined with the structural characteristics of the model, and the unstructured mesh mode is selected to mesh it step by step, and the precise triangle groove is meshed. (3) the parameter setting and numerical simulation analysis of the inner channel mesh model of radial piston pump are carried out by using Fluent's dynamic grid technique and sliding grid technology. The standard k-蔚 model is chosen to analyze the pressure shock and pressure oscillation in a single piston chamber and the flow pulsation at the outlet of a radial piston pump. A reasonable isosceles triangle with 90 掳triangular groove structure is obtained by analyzing and studying the angle between the two edges of the triangle groove of the distribution shaft which is divided into four angles. The numerical simulation and analysis of radial piston pump at 90 掳angle between the triangle groove of the distribution shaft and the radial piston pump are carried out. The relations between the pressure shock and pressure oscillation and the load pressure and the spindle speed are obtained. (4) the negative cover is adopted in the cover structure of the distribution shaft and the plunger. The influence of three different negative cover forms on the pressure and flow rate is simulated and analyzed. Finally, the negative cover structure can be referenced in the structure design of the radial piston pump. In conclusion, through the flow field analysis and the structure study of the distribution shaft in the radial piston pump, the structure parameters of the radial piston pump in the optimum performance are obtained. It provides a certain reference for improving the performance of pump and optimizing design of internal runner.
【学位授予单位】：太原科技大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH322

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