齿轮泵的结构改进设计说明书[带图纸].doc

编号无锡太湖学院毕业设计（论文）题目：齿轮泵的结构改进设计信机系机械工程及自动化专业学号：学生姓名：指导教师：（职称：副教授）（职称：）2013年5月25日无锡太湖学院本科毕业设计（论文）诚信承诺书本人郑重声明：所呈交的毕业设计（论文）齿轮泵的结构改进设计是本人在导师的指导下独立进行研究所取得的成果，其内容除了在毕业设计（论文）中特别加以标注引用，表示致谢的内容外，本毕业设计（论文）不包含任何其他个人、集体已发表或撰写的成果作品。班级：机械97学号：0923807作者姓名：2013年5月25日I摘要齿轮泵是液压系统中最重要的动力源,在液压传动系统中应用广泛,因此,吸引了大量学者对其进行研究,其主要部件是内部相互啮合的一对齿轮。现代机械工程对齿轮泵提出很多新要求，如压强高、排量大、脉动低、噪音低等，所以对齿轮泵的性能分析与改进成为了很重要的课题。本课题以齿轮泵为研究对象，总结了齿轮泵的特点，深入研究了齿轮泵整体结构及其原理，并利用UG三维建模软件对其进行实体建模，对齿轮泵的流量特征、径向啮合力进行理论分析和数值计算，为齿轮泵的设计提供必要的理论依据。研究了多种齿轮泵的齿廓类型，并推导出这些齿廓线方程。最后学习了流体动力学相关的基础理论知识，利用CFD前处理软件Gambit和后处理软件Fluent对以上五种齿廓齿轮泵进行流体分析，并比较不同齿廓分析后的结果，分别计算了齿轮泵齿间区的流量、齿轮啮合区域的流量，最后就得到了齿轮泵的流量。在时间和转速确定的情况下，得到齿轮泵的流速。外啮合齿轮泵的结构对其内部的流场有很大的影响，采用fluent有限元法求解计算模型，就不同齿廓的变化特点进行对比，可以得出每种类型齿廓的相应的优缺点，从而得出最优的分析结果并在此基础上改进设计出新的齿廓线。本文对齿轮泵的输出特性研究，推到出齿廓线方程，最后结合流体动力学理论，运用CFD前处理软件Gambit和后处理软件Fluent对以上五种不同的齿廓齿轮泵进行流体分析，在相同的转速下，比较不同齿廓的分析结果，渐开线齿廓在齿轮泵中的增压效果最好，并提出一些优化方案。关键词：齿轮泵；齿廓；有限元法；输出特性；流体分析`IIAbstractGearpumpisthemostimportantsourceofpowerinthehydraulicsystem,widelyusedinthehydraulicdrivesystem,therefore,attractedalargenumberofscholarsstudy,anditsmaincomponentsareapairofgearsmeshingwitheachotherbytheinternal。Modernmechanicalengineeringhavemadealotofnewrequirementstogearpump,suchashighpressure,largedisplacement,lowrippleandlownoise,PerformanceAnalysisandImprovementofthegearpumphasbecomeaveryimportantissue.Thetopicstogearpumpforthestudy,summedupthecharacteristicsofthegearpump,in-depthstudyoftheoverallstructureandprincipleofthegearpumpandUGthree-dimensionalmodelingsoftware,solidmodeling,theflowcharacteristicsofthegearpump,theoreticalanalysisandnumericalcalculationoftheradialdirectionmeshingforceofradialdirection,toprovidethenecessarytheoreticalbasisforthedesignofgearpump.Avarietyofthetypetoothprofileofthegearpumpandderivetheequationsofthesetoothprofile.Finallylearnthebasictheoreticalknowledgeoffluiddynamics,toCFDpre-processingsoftwareGambitandpost-processingsoftwareFluentformorethanfivetoothprofilegearpumpfluidanalysis,andcomparisonresultsofdifferenttoothprofileanalysiswerecalculatedflowrateoftheareaoftheinterdental,gearmeshingareaofflowofthegearpumpthe,andfinallygottheflowofthegearpump.Inthecaseoftimeandspeeddeterminedtoobtainflowrateofthegearpump.Structureoftheexternalgearpumphasagreatinfluenceonitsinternalflowfield,usingthefluentfiniteelementmethodforsolvingthecalculationmodel,comparisonofthechangesinthecharacteristicsofthedifferenttoothprofilecanbedrawnfromthecorrespondingadvantagesanddisadvantagesofeachtypeoftoothprofiletoarriveatthebestresultsoftheanalysistoimprovethedesignofanewtoothprofileonthisbasis.Theoutputcharacteristicsofthegearpumpontothetoothprofileequationandfinallythetheoryoffluiddynamics,theuseofpre-processingofsoftwareCFDGambitandpost-processingsoftwareFluentfluidanalysismorethanfivedifferenttoothprofileofthegearpumpinthesamespeed,differenttoothprofileanalysisresultofthatthebestofboostereffectisinvolutelinetoothprofileofthegearpump,andputforwardsomeoptimizationprogramofit.Keywords:gearpump；toothprofile；finiteelementmethod；outputcharacteristics；fluidanalysisIII目录摘要........................................................................................................................................IAbstract..................................................................................................................................II目录.......................................................................................................................................III1绪论.....................................................................................................................................11.1齿轮泵的研究内容及意义.......................................................................................11.2齿轮泵国内外的发展概况.......................................................................................11.3本课题应达到的要求...............................................................................................32齿轮泵的工作原理及三维建模.........................................................................................42.1外啮合液压齿轮泵的工作原理...............................................................................42.2齿轮泵分类、用途、应用范围...............................................................................42.2.1齿轮泵的分类.................................................................................................42.2.2齿轮泵的用途及应用范围.............................................................................52.3齿轮泵的三维建模...................................................................................................53齿轮泵的流量特性.............................................................................................................83.1齿轮泵流量的研究...................................................................................................83.1.1齿轮泵平均流量...........................................................................................103.1.2齿轮泵瞬态流量...........................................................................................103.2齿轮泵排量的研究.................................................................................................113.2.1根据齿槽有效容积的排量计算方法...........................................................113.2.2根据轮齿有效体积的排量计算方法...........................................................123.3本章小结.................................................................................................................134流体动力学理论知识研究...............................................................................................144.1流体力学简介.........................................................................................................144.2流体动力学的基本思想.........................................................................................144.3计算流体动力学的特点.........................................................................................154.4计算流体力学的基本步骤.....................................................................................154.5流体力学基本方程.................................................................................................174.6流体流动模型的确定.............................................................................................194.7一般结构.................................................................................................................194.7.1前处理...........................................................................................................194.7.2求解器...........................................................................................................194.7.3后处理...........................................................................................................194.8本章小结.................................................................................................................195齿轮泵不同齿廓的流体动力学分析...............................................................................205.1Fluent简介...............................................................................................................205.2齿轮泵的流体力学分析.........................................................................................20