多作用内曲线径向柱塞泵定子曲线幅角分配的研究

发布时间：2018-11-19 22:00

【摘要】：多作用内曲线径向柱塞泵具有低转速、大排量的特点,在风电领域和变频等领域的应用前景非常好。本文以应用广泛的等加速定子曲线为研究对象,主要围绕幅角变化对定子曲线性能的影响、定子曲线幅角分配设计方法、幅角分配对流量脉动的影响等问题展开分析和研究,为开发设计多作用内曲线径向柱塞泵提供理论支撑。首先,介绍了液压技术在风电领域和变频领域的应用优势,指出了低速大排量液压泵是将该优势化为直接生产力的纽带,并提出采用多作用内曲线定子导轨结构实现液压泵的低速大排量化,接着概述了径向柱塞泵的国内外研究现状及本文的主要研究内容。其次,根据多作用内曲线径向柱塞泵的工作原理,推导了定子内曲线方程和等加速定子曲线方程,并分析了柱塞滚子组件的动力学,发现各区段的幅角分配是影响等加速定子曲线性能的关键因素。另外,以多作用内曲线径向柱塞泵的排油区为例,分别研究了仅变化等加速区幅角、仅变化等速区幅角、仅变化等减速区幅角、多区间幅角同时变化四种幅角变化方案对等加速定子曲线性能的影响,详尽地揭示了度加速度、度速度、压力角、定子导轨曲率半径、接触应力在幅角发生变化后的变化规律。再次,针对多作用内曲线径向柱塞泵可能工作在闭式液压回路或开式液压回路,提出了两种不同的方法设计等加速定子曲线的幅角分配——对称设计法和非对称设计法。根据给定的结构参数,详细地介绍了这两种设计方法的设计过程及注意事项,并比较了这两种方法设计的定子曲线性能。最后,介绍了一种简单易行的研究多作用内曲线径向柱塞泵流量脉动的方法。利用该方法计算了多作用内曲线径向柱塞泵分别工作在闭式液压回路和开式液压回路的瞬时流量及其脉动率,且对其进行了比较分析。
[Abstract]:Multi-acting internal curve radial piston pump has the characteristics of low speed and large displacement, and has a good application prospect in wind power field and frequency conversion field. In this paper, the widely used equal-acceleration stator curve is taken as the research object. The influence of amplitude angle variation on the performance of stator curve, the design method of stator curve amplitude angle distribution, and the influence of amplitude angle distribution on flow pulsation are analyzed and studied. It provides theoretical support for the development and design of multi-action internal curve radial piston pump. Firstly, the application advantages of hydraulic technology in wind power field and frequency conversion field are introduced, and it is pointed out that low speed and large displacement hydraulic pump is the link to turn this advantage into direct productivity. The multi-action inner curve stator guideway structure is used to realize the low speed and large displacement of hydraulic pump. Then the research status of radial piston pump at home and abroad and the main research contents of this paper are summarized. Secondly, according to the working principle of multi-action internal curve radial piston pump, the stator inner curve equation and equal acceleration stator curve equation are derived, and the dynamics of plunger roller assembly are analyzed. It is found that the distribution of amplitude angle of each section is the key factor affecting the performance of equal acceleration stator curve. In addition, taking the discharge area of radial piston pump with multi-action curve as an example, the amplitude angle of constant acceleration zone and equal deceleration zone are studied respectively. The effects of four amplitude-angle variation schemes on the performance of stator curve with equal acceleration are revealed in detail. The variation law of degree acceleration, degree velocity, pressure angle, curvature radius of stator guideway and contact stress after amplitude angle change is revealed in detail. Thirdly, in view of the fact that the radial piston pump with multiple internal curves may work in the closed hydraulic circuit or the open hydraulic circuit, two different methods are proposed to design the amplitude and angle distribution of the constant acceleration stator curve, namely, the symmetrical design method and the asymmetric design method. According to the given structural parameters, this paper introduces the design process and points for attention of the two design methods in detail, and compares the performance of the stator curves designed by the two methods. Finally, a simple and easy method to study the flow pulsation of multi-action internal curve radial piston pump is introduced. Using this method, the instantaneous flow rate and pulsation rate of radial piston pump operating in closed hydraulic circuit and open hydraulic circuit are calculated and compared.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH137.51

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