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1、迷宫密封的结构型式磨阻效应Labyrinthsealissetseveralsequentialcircuitaroundtheshaftsealingteeth,toothandtoothformaseriesofriverclosuregapbetweenwithexpansionofcavity,thesealedmediumduringwindingthroughamazeofclearaneethrottleeffectandachievethegoalofleakageresistance・Becauseoflaby
2、rinthsealclearancebetweentherotorandthecasing,withoutasolidcontact,withoutlubrication,andallowthethermalexpansion,toadapttothehightemperatureandhighpressure,highspeedfrequencyoccasions,thiskindofsealiswidelyusedinsteamturbine,gasturbine,compressor,blowershaftendandse
3、albetweenthelevelofotherdynamicsealfrontsea1.ThesealingmechanismoflabyrinthsealsThemechanismbywhichfluidcreatesresistancethroughamazeandreducesitsf1owiscalleda"labyrintheffect〃・Fluidmechanicaleffect,ineludinghydraulicfrictioneffectandtheeffectoff1owcontraction;Andthe
4、thermodynamiceffectofthegas,whichiscausedbycompressionorexpansionofthegasinthemaze:Inaddition,thereare^breathableeffects〃・Themazeeffectisthesynthesisoftheseeffects,sothemechanismofthelabyrinthiscomplicated.1)theeffectoffrictionWhenthef1owoftheliquidisf1owingthroughth
5、emaze,thefrictioncausedbytheviscosityoftheliquidcausesthef1owratetoslowdown.Simplyput,thepathfrictionofthefluidalongthef1owcharmelandthepartialresistanceconstitutesthegrindingresistaneeeffect,theformerisassociatedwiththelengthandcrosssectionshapeofthechannel,whichisr
6、elatedtothebendingnumberandshapeofthemaze・Generally:whentheflowislong,thecurveissharp,thetoothisthetop,theresistanceisbig,thepressuredifferenceissignificant,theleakagequantityisreduced.1)thecontractioneffectAsthefluidpassesthroughthelabyrinth,theflowoftheflowdecrease
7、sduetoinertia・TheareaoftheapertureisA,andthesmallestareaoftheflowisCcA,whichisthecontractioncoefficient・Atthesametime,thespeedofgasthroughtheorificeisalsohavechange,intheidealsituation,thevelocityoful,theactualflowrateissmallerthanul,makeCDSforspeedcoefficient,theact
8、ualvelocityulforul二Cdulandthroughtheorificeflowwillbeequaltotheq二CcCdAultypeofCc,Cd二alpha(theflowcoefficient)・Theflowcoefficientofa
