CBF-E齿轮泵的结构分析及改进设计

发布时间：2018-11-25 16:40

【摘要】：齿轮泵的轻量化和流量脉动的最小化是齿轮泵的两个主要研究问题。本文以CBF-E型齿轮泵为研究对象，，应用现代设计方法对齿轮泵进行了轻量化设计，通过对齿轮泵的流量脉动及计算流体仿真软件的流场模拟技术的深入研究，分析模拟齿轮泵主要设计参数对齿轮泵流动特性的影响。本文的主要内容包括： (1)从齿轮泵的工作原理出发，简要阐述了齿轮泵的主要结构参数的计算方法以及在正常的工况下这些值的许用范围，并以此为基础建立了数学模型； (2)面向齿轮泵的空间最小体积，在模数选定的情况下求解已经建立的数学模型。得到不同的模数对应的最优参数。形成三种备选方案； (3)对齿轮泵的流量脉动进行分析与研究，包括以下内容： 1)从理论上推导了瞬时流量脉动、最大瞬时流量、最小瞬时流量以及流量不均匀系数的计算方法； 2)通过设计四组试验，选用18种不同结构参数的齿轮泵，计算了不同结构参数齿轮泵的出口瞬时流量，绘制出出口处的流量脉动曲线图，分析了齿轮泵的齿数、模数、压力角及重叠系数对齿轮泵输出流量脉动的影响； 3)应用以上四组试验分析得到的结论，对三个面向轻量化的齿轮泵备选方案的出口流量脉动特性进行分析，综合比较三种备选方案的流量脉动特性，最终确定出流量脉动特性最佳的设计方案。 (4)基于计算流体力学(CFD)软件对齿轮泵内部流场进行数值模拟。包括以下内容： 1)在齿轮泵的内部流场的分析中采用动网格技术以分析齿轮泵内部流场随齿轮轴转角发生变化的规律； 2)基于fluent对齿轮泵的内部流场进行数值模拟。通过对三种备选方案分别进行压力场，速度场及齿间和进出口处流线的分布状态的仿真分析，得出不同设计方案的流场特性，为方案选择提供支持。论文的工作对基于现代设计方法实现齿轮泵的优化设计提供了参考。
[Abstract]:The lightweight of gear pump and the minimization of flow pulsation are two main research problems of gear pump. In this paper, CBF-E gear pump is taken as the research object, and the lightweight design of gear pump is carried out by using modern design method. The flow pulsation of gear pump and the flow field simulation technology of computational fluid simulation software are deeply studied. The influence of the main design parameters of the simulated gear pump on the flow characteristics of the gear pump is analyzed. The main contents of this paper are as follows: (1) based on the working principle of gear pump, the calculation method of main structural parameters of gear pump and the allowable range of these values under normal working conditions are briefly described. On this basis, the mathematical model is established. (2) the space minimum volume of gear pump is used to solve the established mathematical model under the condition of modulus selection. The optimal parameters corresponding to different modulus are obtained. Forming three options; (3) the flow pulsation of gear pump is analyzed and studied, including the following contents: 1) the calculation methods of instantaneous flow pulsation, maximum instantaneous flow, minimum instantaneous flow and non-uniform coefficient of flow are derived theoretically; 2) through the design of four groups of tests, 18 kinds of gear pump with different structure parameters are selected, the instantaneous flow rate of gear pump with different structure parameters is calculated, the flow pulsation curve at the outlet is drawn, and the tooth number and modulus of gear pump are analyzed. The influence of pressure angle and overlap coefficient on the pulsation of output flow of gear pump; 3) based on the conclusion of the above four sets of experiments, the flow pulsation characteristics of the three gear pump options for lightweight are analyzed, and the flow pulsation characteristics of the three schemes are compared synthetically. Finally, the optimal design scheme of flow pulsation characteristic is determined. (4) numerical simulation of internal flow field of gear pump based on computational fluid dynamics (CFD) software. The main contents are as follows: 1) in the analysis of the internal flow field of gear pump, the dynamic grid technique is used to analyze the law of the change of the internal flow field with the angle of gear shaft; 2) numerical simulation of internal flow field of gear pump based on fluent. Through the simulation and analysis of the pressure field, velocity field and the distribution of flow lines between teeth and inlet and outlet, the flow field characteristics of different design schemes are obtained, which provide support for the scheme selection. The work of this paper provides a reference for the optimization design of gear pump based on modern design method.
【学位授予单位】：天津理工大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH325

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