三极并联复合齿轮泵优化设计与仿真研究

发布时间：2018-09-03 16:35

【摘要】：随着液压传动和控制技术的发展,新型齿轮泵的研制和开发对于液压泵技术的发展越来越重要。作为齿轮泵的一种新的结构形式,三极并联复合齿轮泵与普通齿轮泵相比,具有流量脉动小,齿轮径向受力不平衡程度小的优点,与其它齿轮泵新结构相比,具有结构简单,便于制造工艺性好的优点。因此三极并联复合齿轮泵具有较为广阔的工程应用前景。以普通齿轮泵瞬时流量计算公式和啮合点位移变化规律为基础,对三极并联复合齿轮泵瞬时流量进行了研究,推导出了瞬时流量计算公式。然后分主动齿轮齿数是3的倍数和不是3的倍数两种情况,对三极并联复合齿轮泵的瞬时流量特性进行了研究,用MATLAB生成了两种情况下的瞬时流量脉动曲线。指出当主动齿轮不是3的倍数时,三极并联复合齿轮泵具有较好的瞬时流量特性。对齿轮齿顶圆受力进行分析,得出作用在主动齿轮上的径向力合力为零,三级并联复合齿轮泵具有较好的径向力特性。以泵体体积最小为目标函数,对三极并联复合齿轮泵的齿轮参数进行了优化设计。在建立优化设计目标函数过程中,以四个齿轮齿顶圆装配孔体积代替泵体体积,和其它泵体体积的表达方式相比,这种表达方式能比较准确地反映泵体体积。通过一种新的三维逐值搜索方法用MATLAB对三极并联复合齿轮泵优化设计数学模型进行了求解,得出了优化结果。该目标函数和新的三维逐值搜索方法的提出,为三极并联复合齿轮泵的优化设计提出了一种简单易行、行之有效的方法,同时为普通齿轮泵的优化设计提供了参考。以优化设计求解结果为基础,对三极并联复合齿轮泵进行了实体建模,并用Fluent软件的动网格技术对其二维简化模型进行了内部流场仿真,为三极并联复合齿轮泵三维模型的内部流场分析奠定了基础,同时为基于动网格技术的齿轮泵内部流场模拟创造了条件。
[Abstract]:With the development of hydraulic transmission and control technology, the research and development of new gear pump is more and more important for the development of hydraulic pump technology. As a new type of gear pump, the three-pole parallel composite gear pump has the advantages of small pulsation of flow rate and low degree of radial force imbalance compared with common gear pump. Compared with the new structure of other gear pumps, the three-pole parallel composite gear pump has a simple structure. Easy to manufacture the advantages of good technology. Therefore, the three-pole parallel composite gear pump has a broad engineering application prospect. Based on the calculation formula of instantaneous flow of common gear pump and the law of displacement variation of meshing point, the instantaneous flow rate of three-pole parallel composite gear pump is studied, and the formula of instantaneous flow calculation is deduced. Then, the instantaneous flow characteristics of the three-pole parallel composite gear pump are studied, and the instantaneous flow pulsation curves of the two cases are generated by MATLAB. It is pointed out that when the driving gear is not a multiple of 3, the three-pole parallel composite gear pump has better instantaneous flow characteristics. The radial force acting on the drive gear is zero, and the three-stage parallel composite gear pump has better radial force characteristics. Taking the minimum volume of pump body as the objective function, the gear parameters of the three-pole parallel composite gear pump are optimized. In the process of establishing the objective function of optimal design, the volume of pump body is replaced by the volume of assembly hole at the top of four gear teeth, which can accurately reflect the volume of pump body compared with other expression ways of volume of pump body. In this paper, a new 3D searching method is used to solve the mathematical model of the optimal design of three-pole parallel composite gear pump with MATLAB, and the optimization results are obtained. The proposed objective function and a new 3D searching method provide a simple and effective method for the optimal design of the three-pole parallel composite gear pump and provide a reference for the optimization design of the common gear pump. Based on the results of optimization design, the solid model of three-pole parallel composite gear pump is modeled, and the internal flow field simulation of its two-dimensional simplified model is carried out by using the dynamic grid technology of Fluent software. It lays a foundation for the internal flow field analysis of the three-dimensional model of three-pole parallel composite gear pump and creates the conditions for the simulation of the internal flow field of the gear pump based on the dynamic grid technology.
【学位授予单位】：河北工程大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH325

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