配合间隙对直线共轭内啮合齿轮泵流场特性的影响  

Influence of Mating Clearance on Flow Field Characteristics of Linear Conjugate Internal Gear Pump

作　　者：陈鼎 张杨 叶绍干 盛精 CHEN Ding;ZHANG Yang;YE Shaogan;SHENG Jing(School of Mechanical and Automotive Engineering,Xiamen University of Technology,Xiamen 361024,China;Pen-Tung Sah Institute of Micro-Nano Science and Technology,Xiamen University,Xiamen 361021,China)

机构地区：[1]厦门理工学院机械与汽车工程学院,厦门361024 [2]厦门大学萨本栋微米纳米科学技术研究院,厦门361021

出　　处：《农业机械学报》2024年第2期442-449,共8页Transactions of the Chinese Society for Agricultural Machinery

基　　金：福建省科技计划引导性项目(2021H0027);福建省自然科学基金项目(2021J01049、2021J011202)。

摘　　要：直线共轭内啮合齿轮泵是液压系统中的关键组件,因其高效的压力输送特性而广泛应用于工程领域。本文采用计算流体动力学模拟方法对直线共轭内啮合齿轮泵进行研究,分析轴向间隙和径向间隙对齿轮泵泄漏和流场的影响。研究结果表明:配合间隙的变化对齿轮泵的流场特性产生广泛影响,轴向间隙是引发泄漏的主要因素,约占总泄漏量的80%;当轴向间隙由0.03 mm增加到0.07 mm后,输出流量减少20.81%,平均压力下降33.15%,空化产生的气体体积分数增加0.021;而设置相同径向间隙后,输出流量仅下降0.69%,平均压力下降2.76%,空化产生的气体体积分数增加0.005。此外,导致泵内流速变化的主要配合间隙是轴向间隙,适当减小轴向间隙可提升泵内的流体速度,从而提升泵的整体效率。Linear conjugated internal gear pump plays a key role in hydraulic system,and its efficient pressure transmission characteristics make it widely used in engineering field.In this paper,the effects of axial clearance and radial clearance on leakage and flow field of linear conjugate internal gear pump are analyzed by means of computational fluid dynamics simulation.The results show that the variation of mating clearance has a wide and significant influence on the flow field characteristics of gear pump,in which the axial clearance is the main factor causing leakage,accounting for 80%of the total leakage.Specifically,when the axial clearance increases from 0.03mm to 0.07 mm,the output flow rate decreases by 20.81%,the average pressure decreases by 33.15%,and the volume fraction of the gas generated by cavitation increases by 0.021.In contrast,the setting of the same radial clearance only resulted in a 0.69%decrease in output flow,a 2.76%decrease in average pressure,and a 0.005 increase in the volume fraction of the gas produced by cavitation.In addition,the study also found that the main matching clearance leading to the change of flow rate in the pump is the axial clearance.A modest reduction in the axial clearance helps to increase the fluid speed in the pump,thereby enhancing the overall efficiency of the pump.These results provide useful theoretical support for the design and optimization of linear conjugate internal gear pump,which is helpful to improve its performance and reliability in hydraulic system.

关 键 词：直线共轭内啮合齿轮泵 泄漏 流场特性 配合间隙 

分 类 号：TH325[机械工程—机械制造及自动化]