英文文献.docx

英文文献.docx

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英文文献

SUCTIONNOZZLEFORAVACUUMCLEANER,COMPRISINGADUSTFLOWDISPLAYDEVICE

Abstract

Asuctionnozzleforavacuumcleanerthatcanbeconnectedtoasuctionpipeand/orasuctiontubeofthevacuumcleanerincludesanozzlepart（吸盘部分）thatcanbeconnectedtothesuctionpipeorthesuctiontubebymeansofatubularconnectionpart.Adustsensorisarrangedintheflowpathofthevacuumcleaner,thesignalsthereofbeingevaluatedbyabattery-operatedelectroniccontroldevicethatcanbeactivatedbyaLow-pressureswitch.Duringoperation,saidcontroldevicecontrolsadisplaydevicedisplayingthedustflow.Thecontroldevice，thelow-pressureswitch,thedisplayelementsdisplayingthedustflow,andabatterycompartmentforreceivingthebatteriesarearrangedinahousingformedontheuppersideofthetubularconnectionpart.Thedustsensorisarrangedbeneaththehousing，insidetheupperregionoftheconnectionpart，inthedustairstream.

FIELDOFTHEINVENTION

Thepresentinventionrelatestoasuctionnozzleforavacuumcleaner,saidsuctionnozzlebeingconnectabletoasuctionwandand/ortoasuctionhoseofthevacuumcleaner,thesuctionnozzlehavinganozzlepartwhichisprovidedwithasuctionmouthandisconnectabletothesuctionwandortothesuctionhoseofthevacuumcleanerviaatubularconnectionpart,thesuctionnozzleincludingadust-flowsensorwhichisdisposedintheflowpathofthevacuumcleanerandwhosesignalsareanalyzedbyanelectroniccontroldevice,and,duringoperation,thecontroldevicecontrollinganindicatingdevicewhichindicatesthedustflow.

BACKGROUND

Forquitesometime，therehasbeenadesiretoprovidevacuumcleanerswithameasuringandindicatingdevicethatallowstheusertoassesshowthelevelofcleanlinessofthesurfacetobetreatedvariesduringthevacuumcleaningprocess.Infact，itwouldbeofgreathelptotheoperatorifheorshecouldseefromanindicatingdevicethat，afteracertainvacuumcleaningtime，thereremainshardlyanydust-ladenairbeingconveyedthroughtheflow-conveyingsystemofthevacuumcleaner,sothatthevacuumcleaningprocessisnotunnecessarilyprolonged.Toremedythis，anumberofproposalshavebeenmadeinthepatentliterature，buttheseproposalshavenotyetledtoanyimplementationthatwouldberelevantinpractice.

Forexample，itisknownfromEuropeanpublicationEP0231419A1toprovideanindicatingandcontroldeviceintheformofanattachmentoraccessoryforavacuumcleaner,saidindicatingandcontroldevicebeinginstallableintheflow-conveyingsystemofthevacuumcleaner.Thisindicatingandcontroldeviceshouldbeactivatablebyalow-pressureswitchandoperatewithopticaldust-detectingmeans.Itwasalsoproposedtomountthisunitonthevacuumcleaneroritsparts（suctionbrush，suctionwand,handle,suctionhose）atapositionadjacenttothesuctionregionofthevacuumcleaner.Thatpriorpublicationdoesnotincludeanyspecificinformationonhowandwheretoinstallthesensorwhichisattheheartofsuchasystem.Thereisnoknownpracticalimplementationbasedonthisdesignapproach.

Apracticalembodimentinwhichthedust-flowsensingandindicatingdeviceismountedinasuctionnozzleisdescribedinDE9311014U1andDE20207071U1，respectively.Bothdesignapproacheshaveincommonthatthesensingandindicatingdeviceislocatedinthebottompartofthesuctionnozzle.

InDE9311014U1，aremovablesub-housingisprovidedabovethebottompartofthesuctionnozzletoaccommodatethesensorandtheindicatingelements.Thesensorisformedbyopticaldust-detectingmeansprovidedintheinletductorintheinletregionofthebottompartofthesuctionnozzle.Thefloornozzledepictedinthatpriorpublicationillustratesthedrawbacksofthisembodimentparticularlywell.Sincetheadditionalelements（sensor,battery-operatedcontroldevice,andindicatingdevices）areaccommodateddirectlyinthebottompartofthesuctionnozzle，thesizeofthebottomparisinevitablyincreased.Therefore,itisnolongerpossibletomovesuchasuctionnozzleintothenarrowfreespacesunderfurniture.Moreover,incaseswherethebottompartofthesuctionnozzledoesdisappearunderapieceoffurniture，theindicatingdeviceisnolongervisible.Furthermore,thebottompartofthesuctionnozzle,inparticular,isinevitablyexposedtostrongshocks.Thismayeasilyleadtofailuresofthecontrolelectronicslocatedinthebottompartandofthesometimesfragilesensorelements.

Thesearecertainlythecrucialreasonswhy,uptothepresenttime，nosuctionnozzlehavinganindicatingandsensingdevicemounteddirectlyinthebottompartofthesuctionnozzlecouldbeestablishedinthemarkettoanappreciableextent.

Alldesignapproachesdescribedabovearebasedonprovidingasensorintheformofanopticaldust-detectingmeanswhich,forsystem-inherentreasonsalone，hascertaindraw-backs.Itisnotveryeasytoprovideanopticalmeasurementsectionintheconfinedmountingspaceintheflowchannelsoftheair-conveyingsystemofavacuumcleaner.Moreover,anopticalmeasuringsystemisnotsufficientlyreliableandaccurateforcertainpurposes.Aparticulardisadvantageofopticalsystemsisthat,inadditiontotheactualdust,theyalsorespondtocarpetfibersresultingfromwearandtearofacarpet，butdonotallowanyconclusionsaboutthelevelofcleanliness.

Incontrast,adesignapproachdescribedinEP0759157B1isparticularlyadvantageousinthatitusesapiezoelectricsensordevicewhichallowsevenminutedustparticlestobereliablydetectedwithoutthesignalbeingaffectedsomuch,forexample，bycarpetfibers.Theembodimentdescribedinthatpatentproposesforthepiezoelectricsensortobemountedintheinlettubeorinaninletconnectorofthevacuumcleaner.Whenthedustparticlespresentintheair-flowpathhitthepiezoelectricsensortheytransferpartoftheirenergytothesensor,thepiezoelectricsensorconvertingthekineticenergyintoacorrespondingelectricalsignal（piezoelectricvoltage）.Thatpriorpublicationdoesindeeddescribethephysicalsensorsystemandtheelectroniccontrolsystemindetail，butitdoesnotprovideanydetailsonwhereandhowtoinstalltheindividualelements-sensor,controlelectronics,indicatingdeviceand,possibly,abatteryprovidedforpowersupply.

SUMMARYOFTHEINVENTION

Itisanobjectofthepresentinventionthatasensingandindicatingdevicebeaccommodatedintheair-flowpathofthevacuumcleanerinsuchamannerthatthecomponentsinvolvedintheoverallsystemareinstalledinaspace-savingandergonomicallyfavorablemanner.Afurtheroralternateobjectistofindaninstallationlocationforthesensor,which

hasfavorableflowcharacteristicsandensurestrouble-freeandreliableoperation.

Thepresentinventionprovidesasuctionnozzleforavacuumcleaner,saidsuctionnozzlebeingconnectabletoasuctionwandand/ortoasuctionhoseofthevacuumcleaner,thesuctionnozzlehavinganozzlepartwhichisprovidedwithasuctionmouthandisconnectabletothesuctionwandortothesuctionhoseofthevacuumcleanerviaatubularconnectionpart,thesuctionnozzleincludingadustsensorwhichisdisposedintheflowpathofthevacuumcleanerandwhichislocatedinthedust-airstreaminsidetheupwardportionoftheconnectionpartandwhosesignalsareanalyzedbyanelectroniccontroldevice,duringoperation，thecontroldevicecontrollinganindicatingdevicewhichindicatesthedustflow,theindicatingelementsindicatingthedustflowbeingdisposedinahousingorreceivingchamberformedontheuppersideofthetubularconnectionpart,whereinthedustsensorisinsertableunderneaththehousingthroughanopeningformedontheuppersideoftheconnectionpartandprotrudesintothedust-airstreamneartheupperwallareaoftheconnectionpart.Advantageousembodimentsandrefinementsofthepresentinventionwillbecomeapparentfromtheclaims（权利要求书）.Thepresentinventionalsoprovidesanaccessoryorretrofitsolutionintheformofaseparateconnectionpart，whichcanbeconnected，asanindependentpart，directlytoafloornozzleofthevacuumcleaner.

Thepresentinventionprovidessignificantadvantages.Itwasfoundthatespeciallytheupwardlydirectedconnectionpartofthesuctionnozzlesisparticularlysuitableforaccommodatingthesensor,controlandindicatingsystem.

Nevertheless，thebottompartorthesuctionmouthpartofthesuctionnozzlecanstillbeofflatconstruction.Inaddition,byforminganattachablehousingontheuppersideoftheconnectionpartortheupwardconnectormember,allcomponentscanbeaccommodatedinamannerwhichisergonomicallyfavorableandcompatiblewithstylingrequirements.Thebatterycompartment，forexample，iseasilyaccessible，andthebatteriesareveryeasytoreplace.Moreover,theindicatingelements，whichindicatetheconditionofthesuctionairstreaminthegenerallyknownmannerbymeansofindicatingLED’s，canbeinstalledsuchthattheyareeasilyrisibletotheuser.Thisdisplaywindowisalwaysinthedirectlineofsightoftheuser,becauseduringvacuumcleaning，heorsheisalwayslookingalongthesuctionwandtowardthesuctionnozzlearea.

Another,particularlyessentialfeaturesarethatthepiezoelectricsensor（压电传感器）ismountedonthelowersideoftheupperwalloftheconnectionpart.Thisdecisivelycontributestothespecialmethodofoperationofthesystem.Whenheavypartsandparticlesarestillpresentinthesuctionairstream,theseareconveyedbythedust-airstreamgenerallybeneaththesensorandintothecollectingchambersystemofthevacuumcleaner.T