弧齿齿轮泵运行特性分析

发布时间：2018-03-20 23:36

本文选题：弧齿齿轮泵　切入点：困油　出处：《扬州大学》2011年硕士论文　论文类型：学位论文

【摘要】：齿轮泵具有结构简单、使用可靠、寿命长、价格低的优点,广泛应用于机床、汽车、船舶、飞机等机械产品的液压系统中。本文提出的弧齿齿轮泵是一种新型齿轮泵,主要由一对几何参数相同的渐开线弧齿圆柱齿轮、传动轴、泵体、端盖构成。由于弧齿圆柱齿轮传动具有啮合性能好、重叠系数大、噪声低、承载能力强、无轴向分力、使用寿命长等优点,用其构建齿轮泵具有明显的优势。本文分析了弧齿圆柱齿轮副的啮合特性,确定了其几何参数以及正确啮合条件,并且推导了啮合齿廓方程、啮合线方程、齿面方程以及重合度计算公式。根据分析可知一对弧齿圆柱齿轮齿面能够实现线接触,实现封油,因此弧齿圆柱齿轮可以用于构建齿轮泵,并且保证泵的正常运转。本文分析了弧齿齿轮泵的困油特性,推导了其平稳运行的条件,探讨了不发生困油现象时弧齿圆柱齿轮副的几何参数之间的关系,即：通过合理设置齿轮的几何参数,弧齿齿轮泵可以平稳传动且不发生困油现象。通过对直齿齿轮泵、弧齿齿轮泵瞬时流量及流量脉动计算分析得到：在主要几何参数相同的情况下,弧齿齿轮泵的流量脉动小于直齿齿轮泵的流量脉动。最后,本文介绍了计算流体动力学中的相关数学模型以及泵内流场的离散格式和数值计算方法。使用三维造型系统对弧齿齿轮泵进行三维造型,用网格划分软件Gambit进行实体处理与网格划分,应用流场分析软件Fluent对泵内流场进行数值模拟分析,得到其流场压力云图、速度矢量图和瞬时体积流量变化图,并据此分析了流场的流态,所得到的流场内的压力、速度分布与理论分析基本一致。弧齿齿轮泵的动态特性模拟分析结果与直齿齿轮泵的数值模拟分析结果对比表明,弧齿齿轮泵的瞬时流量脉动特性优于直齿齿轮泵。
[Abstract]:Gear pump has the advantages of simple structure, reliable use, long service life and low price. It is widely used in hydraulic system of machine tool, automobile, ship, aircraft and so on. It is mainly composed of a pair of involute arc tooth cylindrical gears with the same geometric parameters, transmission shaft, pump body and end cover. Because the arc tooth cylindrical gear transmission has good meshing performance, large overlap coefficient, low noise, strong bearing capacity and no axial component force, With the advantages of long service life, the construction of gear pump has obvious advantages. In this paper, the meshing characteristics of the cylindrical gear pair with arc teeth are analyzed, the geometric parameters and the correct meshing conditions are determined, and the meshing tooth profile equation and the meshing line equation are derived. According to the analysis, it can be known that a pair of arc cylindrical gears can achieve linear contact and seal oil, so the arc tooth cylindrical gear can be used to construct gear pump and ensure the normal operation of the pump. In this paper, the oil trap characteristic of arc tooth gear pump is analyzed, the condition of its smooth operation is deduced, and the relationship between geometric parameters of arc tooth cylindrical gear pair without oil trap is discussed, that is, by setting the geometric parameter of gear reasonably, The arc gear pump can drive smoothly and does not get stuck in oil. By calculating and analyzing the instantaneous flow rate and flow pulsation of the straight tooth gear pump and the arc tooth gear pump, it is concluded that the main geometric parameters are the same. The flow pulsation of arc gear pump is smaller than that of straight gear pump. Finally, this paper introduces the relevant mathematical models in computational fluid dynamics, the discrete format and numerical calculation method of the flow field in the pump. The three-dimensional modeling system is used to model the arc gear pump. The solid processing and mesh division are carried out with Gambit, and the flow field inside the pump is simulated and analyzed by using the flow field analysis software Fluent. The flow field pressure cloud diagram, velocity vector diagram and instantaneous volume-flow change diagram are obtained, and the flow field pressure cloud diagram, velocity vector diagram and instantaneous volume flow change diagram are obtained by using the flow field analysis software Fluent. According to the analysis of the flow field, the pressure and velocity distribution in the flow field are basically consistent with the theoretical analysis. The results of dynamic simulation analysis of arc gear pump and numerical simulation analysis of straight tooth gear pump show that the pressure and velocity distribution in the flow field are basically consistent with the theoretical analysis, and the results show that the dynamic characteristics of the arc gear pump are compared with those of the straight gear pump. The instantaneous flow pulsation characteristic of arc gear pump is better than that of straight gear pump.
【学位授予单位】：扬州大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH325

【参考文献】