德国液静压技术资料型录

PMcontrollerandjetpumpwithexamplesofapplicationTechnicalInformationHydrostaticfromHyprostatik®InnovationforguidesHYPROSTATIKSchönfeldGmbH·
Controllername62.
AdvantagesofthePMcontroller63.
FeaturesofthePMcontroller64.
Behaviourwithdifferentoilviscosities65.
Controllercharacteristiccurve76.
FlowrateandpressuremagnitudesofthePMcontroller76.1Influenceofthepumppressureonthecontrolmode76.2Flowratefactors,relatedtotheoilviscosity10mPas77.
TypesofthePMcontroller87.1PMcontrollerin“seriesconstruction”87.1.1ConfigurationofthePMcontrollerin“seriesconstruction”87.1.2UseofthePMcontrollerin“seriesconstruction”97.2Side-mountedPMcontroller97.2.1Designoftheside-mountedPMcontroller97.2.2Useoftheside-mountedPMcontroller108.
Controllerdimensions109.
Installationinstructionsandregulations109.1FillingthePMcontrollerforthefirsttime109.2Ventilation109.3Recommendedinstallationposition109.4Ventilationprocedure119.5FixingthePMcontroller119.6Connection119.7Dismantling1110.
Oilfiltering1111.
Controllerlabelling1112.
Flowratedataselection(seesection6)1213.
Technicaldiagrams5to15123HYPROSTATIKSchönfeldGmbH·
Jetpumppossibleapplications181.1Initialtensionofguideswithoutwrap-around181.2Clampingfunctions182.
Designandmodeofoperationofthejetpumps183.
Jetpumpfeatures194.
Behaviourwithdifferentoilviscosities195.
Characteristiccurvesofthejetpumps(TypesofoilcorrespondingtoVG32-VG68)196.
Type196.1Case-jetpump(Fig.19)196.2Installation-jetpump(Fig.20)206.2JetpumpinstalledinserieswiththePMcontroller(Fig.6and8)207.
Suctioncupversion(seeFig.21andFig.22)208.
Installationinstructionsandregulations218.1Connectonpipes,connectionboresforbuilt-injetpumpaccordingtoFig.20218.2Heightdifferencebetweenjetpumpandvacuumsuctioncup218.3Oilfiltering218.4Installation21PartIII:ApplicationExamples
HydrostaticV-flatguide24
Hydrostaticguidewithwrap-around24
Hydrostaticguidewithoutwrap-around25
Hydrostaticlinearmotorguide25
Hydrostaticcompactguide264HYPROSTATIKSchönfeldGmbH·®InnovationforguidesPartI:PMcontroller6HYPROSTATIKSchönfeldGmbH·“Progressiv-Mengen(ProgressiveQuantities)”controllerdescription.TheProgressiveQuantitiesControllerdescriptionwascho-senduetotheprogressive(increasing)characteristiccurveofthecontroller.
2.AdvantagesofthePMcontrollerBeforedevelopmentofthePMcontroller,thefluidflowwasregulatedinthehydrostaticpocketsusingcapillaries,re-frainingfromthelesssuitablemethodswithonepumpperpocket.Thecapillaryisaconstantresistancesothatwithlaminarflowtheflowratethroughthiscapillaryispropor-tionaltothedifferentialpressureabovethiscapillary.Thismeansthatwithaconstantinputpressure(=pumppressure)atthecapillary,theflowratethroughthecapillaryandtherebythroughthehydrostaticpocketdropswithincreasingpressureinthepocket(=outputpressureatthecapillary).Thususingcapillariesresultsinsignificantlylargerchangesinthehydrostaticcolumn,i.e.lessstiffnessthanwithconstantflowrate.IncontrastthePMcontrollerduetoitsuniquedesign-onlycontrolledbythedifferentialpressurebetweencontrollerinputandoutput–deliversanalsoincreasingfluidflowintothepocketwhenthepocketpressureincreases!Thuscomparedwithconstantfluidflowinthepocket,asmallercolumnchangeandtherebyhigherstiffnessareachievedwiththePMcontroller.Comparedwithcapillariesapprox.fourtimesthestiff-nesscanbeachievedforcomparableratiosonaccountofthisusingPMcontrollers.
ThePMcontrollersshowthefollowingfeatures.
practicallywear-freeandhysteresis-freebymeansofpracticallypurelyelasticallyoperatingregulators
relativelyinsensitivetocontaminationbymeansofthrottlegapswithlargerectangularcrosssectionorregulatorswithacertainself-cleaningeffect
excellentdynamicbehaviouronaccountofminimalregulationpaths(approx.0.025mm),smallertoacceleratemassesandlargeractuatingforces
bothtypesareself-ventilatingiftherecommendedinstallationpositionoftheseriesPMcontrollerisobserved
smallspacerequirement–seeFig.5-15
lowweight,thecontrollersaremainlymadeofaluminium
corrosion-resistant,theliquidtoberegulatedonlycomesintocontactwithanodisedaluminiumandthemembrane
inthecaseofunacceptablyhighdifferentialpressureonthemembrane,thisiscounteractedbysupportpadsonasphericalareaonthecontrollercasesothatdamagetoorevendestructionofthemembraneislargelyruledout
withthePMcontroller–withoutreserve–pocketpressuresuptoapprox.90%ofthepumppressurecanbeused.Withcapillariesandpocketpressuresclosetothepumppressure,theflowrate(andthusthecolumnheight)ofthepocketsisverysmall,becauseusuallyonlypocketpressuresuptoapprox.75%ofthepumppressurearepossiblewithcapillaries
3.FeaturesofthePMcontroller4.BehaviourwithdifferentoilviscositiesAstheflowinthefixedthrottlecolumnofthePMcontrollerisalwayslaminar,thecontrollerflowrateisinverselyproportionaltotheoilviscosity.Italsoshowsthesamebehaviourasthedownstreamcolumnsofthehydrostaticpockets.Inthiswaythepropertiesofbearingsorguides–e.g.ofmachinetools–arepracticallyunaffectedbytheoilt