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1、真空发生器的工作原理TheworkingprincipleofthevacuumgeneratorThevacuumgeneratoristheuseofanew,positivepressureairsupplytoproducenegativepressureisefficient,clean,economical,smallvacuumcomponents,whichmakesthecompressedairoftheplace,orinapneumaticsystemandtheneedofpositiveandnegativepressurewherenegati
2、vepressurebecomeseasyandconvenient・Vacuumgeneratorsarewidelyusedinindustrialautomation,machinery,electronics,packaging,printing,plasticsandroboticsandotherfields・Thetraditionaluseofvacuumgeneratorsisthecombinationofsuctioncupsandvariousmaterialsforhandlingandconveying.Itisespeciallysuitabl
3、eforadsorbingfragile,soft,thin,nonferrous,non-metallieorsphericalobjects.Acommonfeatureofsuchapplicationsisthesmallamountofgasrequired,thelowvacuumrequirements,andtheintermittentoperation・Theauthorthinksthatthesuctionmechanismofthevacuumgeneratorandtheanalysisofthefactorsaffectingitsworkin
4、gperformaneeareofpracticalsignificaneeforthedesignandselectionofthepositiveandnegativepressureairway.1theworkingprincipleofthevacuumgeneratorTheprincipleofthevacuumgeneratoristousejetnozzletojetairathighspeed,andformajetattheoutletofnozzletoproduceentrainmentflow.Undertheactionofsuction,th
5、eairaroundthenozzleoutletissuckedoutcontinuously,sothatthepressureintheadsorptionchamberdropsbelowatmosphericpressure,formingacertaindegreeofvacuum.Asshowninfigure1:Fig.1SchematicdiagramofthevacuumgeneratorByfluidmechanics,continuityequationsforincompressibleairgases(atlowvelocity,whichcan
6、beapproximatelyconsideredasincompressibleair)arederivedAlvl二A2v2SectionareaoftheAlandA2pipesintheformula,M2VI,v2airflowvelocity,m/sTheuppersectionshowsthatthecrosssectionincreases,theflowvelocitydecreases,thecrosssectiondecreases,andtheflowvelocityincreases・Forhorizontalpipelines,theBernou
7、riidealenergyequationforincompressibleairisassumedtobePl+1/2Pvl2二P2+1/2,PV22Intheformula,thecorrespondingpressureatPl,P2,Al,A2,PaVI,v2,Al,A2,correspondingflowvelocity,m/sP-airdensity,kg/m2Fromtheuppermodel,theflowrateincreasesandthepressuredecreases・Whenv2>>vl
