机械类外文翻译外文文献英文文献扭矩过载保护器

TorqueoverloadprotectionValveelectricdeviceisusedtooperatethevalveandwasoneofthevalvesconnectedtothedevice.Thedeviceisdrivenbyelectricity,theirmotionprocesscanbestroke,torque,ortocontrolthesizeoftheaxialthrust.Asthevalveshouldbetheworkofelectricaldevicecharacteristicsandutilizationdependonthetypeofvalves,fittingsandvalvesregulatetheworkofthepipelineorequipmentlocation.Therefore,controlvalveelectricdevicetherightchoice;considerthepreventionofoverload(workingtorquehigherthanthecontroltorque)hasbecomeessentialtotheoccurrenceofaring.Valveelectricdevicerightchoiceshouldbebasedon:1.Operationtorque:Operationtorqueistoselectthemainvalveelectricaldeviceparameters.Theoutputtorqueelectricactuatorvalveoperationshouldbethegreatestmomentof1.2~1.5times.2.OperationThrust:thehoststructureofMOTORIZEDVALVEACTUATORthevalveelectricdevice,therearetwo,oneisnotconfiguredthrustplate,thistimedirectlytotheoutputtorque;theotherisequippedwiththrustplate,andthistimetheoutputtorqueofthevalvestemthroughthethrustdisknutisconvertedtotheoutputthrust.3.Numberofoutputshaftrotationcircle:valveelectricactuatoroutputshaftrotationthenumberoflapsandthevalvenominaldiameter,stempitch,threadthefirstfewrelated,accordingtoM=H/ZScomputing(where:Mfortheelectricalinstallationsshouldbetomeetthetotalnumberofrotatingring;Hofthevalveopeningheight,mm;Stostemtransmissionthreadpitch,mm;Ztostemthenumberofscrewheads.)4.StemDiameter:Formulti-turntypevalvesforthenextshot,iftheelectricactuatorallowsthemaximumstemdiameterofthevalvestemcannotbedispensed,itcannotbeassembledintoelectricvalve.Therefore,theelectricaldevicehollowoutputshaftdiametermustbegreaterthanspecifiedunderthevalvestemdiameter.Forsomerotaryvalves,aswellasmulti-turnvalvesinthedarkbarvalve,althoughwithoutconsideringtheadoptionofstemdiameter,butshouldalsotakefullaccountofthematchingstemdiameterandkeywaysize,sothatworkcanbeassembled.5.OutputSpeed:valveKai,closedfast,easytoproducewaterhammerphenomenon.Shouldthereforebeunderdifferentconditionsofuse,choosetheappropriateKaiandclosingspeed.6.Theinstallation,connectionmethod:electricequipmentinstallationforverticalinstallation,theleveloftheinstallation,floorinstallation;connectionsasfollows:Arethrustplate;stemthrough(Mingpolemulti-turnvalves);darkbarmulti-turn;withoutthrustdisk;stemisnotpassed;partoftherotationElectricdeviceiswidelyused,istoachieveproductionprogram-controlledvalves,automaticcontrolandremotecontrolcannotbealackofequipment,itsmainuseintheclosedvalve.Butwecannotignorethespecialrequirementsofvalveelectricdevice-mustbeabletolimitthetorqueoraxialforce.ValveElectricinstallationsareusuallylimitedtorqueCouplings.Whentheelectricaldevicespecificationisdetermined,thecontroltorqueisalsodetermined.Whileinapre-determinedperiodoftimetorunwhenthemotornormallydoesnotoverload.However,ifthefollowingconditionssothatitcanbeoverloaded:1.Powersupplyvoltageislow,arenotrequiredtorque,themotorstopsrotating.2.Mistakenlysetthetorquelimitadjustmentagencies,sothatitisgreaterthanstoptorque,generatedtoolargearesultofcontinuoustorque,themotorstopsrotating.3.Suchasthepointofactionasintermittentuseofheatgeneratedsavingsofup,morethantheallowabletemperatureriseofthemotor.4.Torquelimitforsomereason,institutionalcircuitfailure,sothattorqueistoolarge.5.Useofenvironmentaltemperatureistoohigh,relativetotheheatcapacityofthemotordown.Theaboveistheexcessivenumberofreasons,forthesereasonsshouldbegeneratedbymotoroverheatinginadvance,takingintoaccount,andtotakemeasurestopreventoverheating.Inthepasttoprotectthemotorwayistousefuses,overcurrentrelays,thermalrelays,thermostats,etc.,buttheseapproachesalsohavetheirprosandconsofthischangefortheelectricaldeviceloaddevices,isabsolutelyreliableprotectionmethodisnot.Mustthereforetakeallmethodscombinedapproach.However,astheloadoneachelectricaldeviceisdifferent,itisdifficulttoproposeaunifiedapproach.Inmostcases,butgenerally,youcanalsofindcommonground.Overloadprotectiontakenbytheway,begroupedintotwotypes:1.Changesininputcurrenttothemotortojudge;2.Tojudgetheheatofthemotoritself.Thesetwomethods,regardlessofthekindproductionSummarizeofmotorthermalcapacitymusttakeintoaccountthegiventimemargin.Ifasinglewaythatwillmaketheheatcapacitycharacteristicsofthemotorlineisdifficult.Therefore,over-loadshouldbeselectedaccordingtothereasonsfortheactioncanbeareliablemethod-combinationofcomplexwaysinordertoachieveacomprehensiveover-loadprotection.Rotorkelectricactuatormotor,itsembeddedinthewindingsinthemotorinsulationlevelconsistentwiththethermostat,whenthereachtheratedtemperature,motorcontrolloopwillbecutoff.Thermostatheatcapacityissmallinitself,anditstime-limitedfeaturesisthemotorheatcapacitycharacteristicsofthedecision,sothisisareliablemethod.Thebasicmethodofoverloadprotectionare:1.Continuousoperationofmotorjogoperation,oroverloadprotectionwithathermostat;2.Locked-rotorprotectionofmotorthermalrelay3.Pairsofshortcircuitfaultsusingfuseorovercurrentrelays.Valveelectricdevicetopreventoverloadoftherightchoiceandisverymuchrelatedandshouldpayattentionto.Inconsiderationofeconomicasp