多级干式罗茨真空泵实际抽速计算研究

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1、东北大学硕士学位论文AbstractResearchonActllalPumpingSpeedCalculationofMultistageDryROOtSVacuumPuⅡlpsAbstractWiththedevelopment0felectronic，chemical，filmaIldfreeze．drVingindustries，oil．freevacuumenvironmentisneededbVmore卸dmoreindustries雒theirprocessesconditions．Therefore，rootspumpismo

2、reandmOrcdesirableinthemarket．Whenweestimater00tspump’sperfb加anCessuchasultimatepressure，weshouldpreciselVcalculatetheleakageofclearances．Butnowthere’rcmostlyexperiencefo肌ulas．Whenthepumpworks，itschannel’ssizechanges，rotorscircumrotate，andwedon’tconsidertheeffectofthemtocon

3、ductance．Sothere’sabigdifferencebetweenthevaluesoftheoreticandexperiment．Whenthecorporationdesignandproduceanewpump，theyusuaUycallrythfouglIacademicdesiEmbasedontechniquerequestsfirstlV：ThentheVproduceasamplet0validatethem．T1ledi疵rencebetweentheoretic锄dexperimentmakesustoc0

4、Hectandimproveonthedesi窜皿．LatertheVp州uceanOthersampletovalidateit．IIlthiswaywewillcertainlyuseupamassoftimeandmoneV．11lthispaper'themorcaccuratemodelingand锄eliorationoffootspump’sleakageisresearched．Wesummarizethecapabilitytar霉retsaIldtheircalculatemethodofrootspump．Somecas

5、esofclearanceleaka2譬aresimplydescribed．ThetopicismainlyOnthebuildingofthegapleaka目emodel0ftheRootspump，andt0considerthedefbnnationOwningtotheimbalancebetweentherotorsandtheimpact0ntllegapowningt0heatdistonionofthebodV．atlast，Ifinishtheimprovement册thescfactorS．Weint刚ucethero

6、torequations，characterdimensionsandmeshprinCiplesofdfc：Illar踟．c，involuteandcVcloid．Theleakage’scalculationmethodsofthesekindsofpumpsaredescribedonthebaseofamelioratedmOdel．WecanusesomesoRw铷『eandmakeuseofhigllermathematicstowritecalculationprocesstOmakethecalculationeasV．The

7、n，wecalculatetheleakagesandped．o姗ancesofafootspumppattem．W色shouldconsideritinouflaterfesearch．AmdtheVwereoDmparedandanalvzedwiththecalculatedvahlesandthemeasuredvalueswhichweren’t锄endedbefbI-c．Theresultindicatesthattherevisedc“eulatin2methOdispreciserthan臼．aditionalmethOds0

8、ntheultimatepressure．Wbcalculatethelea：ka盛eof加otpumpprototypc’andthenanalysetllero