齿轮泵卸荷槽设计及其内流场特性仿真

Design and Inner Flow Simulation for a Gear Pump with Relief Groove

针对齿轮泵的困油问题,给出一种齿轮泵卸荷槽的综合设计方法,并基于计算流体技术完成其内流场特性的仿真分析研究。首先,在某型外啮合齿轮泵基本结构基础上,对卸荷槽进行综合设计,提出具体的设计方法并给出设计结果;进而通过计算机CAD技术建立齿轮泵三维模型和流道模型,并利用Pumplinx进行该型齿轮泵的内流场特性模拟仿真,对比仿真结果与试验数据,误差在5%以内,验证了采用的仿真技术能够有效实现该型泵的特性分析;最后,将综合设计的卸荷槽与3种典型卸荷槽进行特性预测及对比,可以表明:相比其他3种典型卸荷槽结构,综合设计的卸荷槽可以有效地缓解齿轮泵啮合区域的困油压力,并减小齿轮泵的流量脉动,有效地改善了齿轮泵的困油现象。所得出的结论对高性能齿轮泵的设计及仿真研究具有一定的工程实践意义。

A combined design method of the relief groove for a gear pump is given and the research on the simulation of the internal flow field is completed.A combined design method of the groove is given,where the design results of the main geometrical parameters are confirmed.Furthermore,the three-dimensional model and flow model of the gear pump are completed by CAD.Then the inner flow field is simulated by using the i.e.Pumplinx.The error is within 5%between simulation and experiment.As a result,it indicates that the used simulation method is correct and effective for analyzing the pump performance.Additionally,through comparing the internal flow field among the different grooves,it indicates that the groove of combined method can effectively relieve the trapped oil pressure in the gear pump meshing area,and the flow pulsation of the gear pump is reduced.So,it can obviously improve the oil trapped phenomenon of the gear pump.The conclusions have certain significance for the design and simulation of high-performance gear pumps.