I-flowmeter elungileyo

I-Positive displacement flowmeter-PD Iimitha

Xa kufikwa kumlinganiselo wemilinganiselo yokuqukuqela yevolumetric iyonke kumbandela wolwelo, akukho nto isebenza ngcono kuneemitha zokuqukuqela ezisetyenziswa kwiinkqubo ezahlukeneyo eziphathelele kwiinkalo zokusebenza ezahlukeneyo.I-flowmeter efanelekileyo ekhoyo kwimarike isetyenziselwa izicelo ezininzi eziphezulu, kwaye nganye ineenzuzo ezahlukeneyo, amaxabiso asebenzayo, iimpawu, iindlela kunye neenkcukacha.

Ukufuduswa okulungileyo Iimitha eziqukuqelayo ziintlobo zeeflowmitha ezilungele umlinganiselo wokuqukuqela kolwelo lwe-viscous.Ezi zikwajongwa njengezifanelekileyo kwizicelo ezifuna ukusetyenziswa kwenkqubo yemitha yomatshini elula.Ngokubanzi, imitha yokuqukuqela elungileyo inegumbi okanye umngxuma othintela ukuhamba.Isixhobo esijikelezayo okanye esiphindaphindayo sibekwe ngaphakathi kwigumbi ukuvelisa iipasile zedistere ezinomthamo osisigxina kulwelo oluqukuqelayo.Ngeeyunithi zemitha ye-PD, ulwelo luya kwahlulwa lube lunyuko olubalwe ngokuthe ngqo oluthi ke luphinde lubalwe ngerejista eqhagamshelayo.Kuba lonke ulwandiso olulinganisiweyo lumele umthamo owahlukileyo, ezi ntlobo zemitha zisetyenziswa ngokubanzi kwi-batching ngokuzenzekelayo kunye neenjongo zokubala.

Yintoni i-Positive Displacement Flow Meter?

Ukuchaza isixhobo, yintoni iPositive Displacement flow meter (PD) ?– Imitha yomatshini esetyenziswa kakuhle kwizinto ezingangcolisiyo nezicocekileyo.Ukukwazi ukulinganisa uluhlu olubanzi lolwelo olubandakanya nalawo ane-viscosities ephezulu, le mitha yokuhamba iza neengenelo ezininzi.

Ikwaziwa njengamahashe okusebenza kusetyenziso lomlinganiselo wokuqukuqela, esi sixhobo somlinganiselo wesantya sokuqukuqela silinganisa ireyithi yokuqukuqela kwento engamanzi ngokuyivumela ukuba ihambe kwisixokelelwano ngezavenge.Xa isetyenziselwa usetyenziso lwemizi-mveliso, iimitha zokuqukuqela zePD ziyaziwa ngamandla azo okulinganisa iireyithi zokuqukuqela ezintsonkothileyo nezibalulekileyo zolwelo ngokuchaneka nangokulula.

I-Positive Displacement (PD) Iimitha eziqukuqelayo zizixhobo zomlinganiselo wokuqukuqela komthamo olinganisa ukuhamba ngokugqithisa umthamo ochanekileyo wolwelo ngojiko ngalunye.Iimitha zokuhamba zePD zizixhobo ezichanekileyo ezinamalungu ahambayo angaphakathi atshixelwe nge-tandem kunye nomthamo wolwelo oluhamba ngemitha yokuhamba.

Imitha yokuFuduka eNgcono luhlobo lwemitha yokuqukuqela efuna ulwelo lokushenxisa amacandelo akwimitha ngoomatshini ukwenzela umlinganiselo wokuqukuqela.Ukufuduswa okulungileyo (i-PD) ukuhamba kweemitha zokulinganisa isantya sokuhamba kwe-volumetric yolwelo oluhambayo okanye igesi ngokwahlula i-media kwi-fixed, i-metered volumes (ukunyuka okulinganiselweyo okanye umthamo wolwelo).

Isebenza njani i-Positive Displacement Flow Meter?

Isifaniso esisisiseko siya kubamba ibhakethi ngaphantsi kwempompo, ukuyizalisa kwinqanaba elimiselweyo, emva koko uyitshintshe ngokukhawuleza enye ibhakethi kunye nexesha lesantya apho iibhakethi zizaliswe khona (okanye inani lilonke leebhakethi zokuqukuqela "kuphelele") .Ngoxinzelelo olufanelekileyo kunye nembuyekezo yeqondo lokushisa, isantya sokuhamba kobuninzi sinokumiselwa ngokuchanekileyo.

Uthotho lweemitha ze-Koeo M ziimitha zokufuduswa ezilungileyo.Ziyilelwe umlinganiselo wolwelo kuzo zombini ugcino-udluliselo kunye nenkqubo yolawulo lwezicelo.Zinokufakwa kwiimpompo okanye kwiinkqubo zokuhamba komxhuzulane.Ngenxa yoyilo lwazo olulula, kulula ukuzigcina, kwaye kulula ukuziqhelanisa neenkqubo ezahlukeneyo.

Indlu yemitha (1) iyilwe ibe nebhore ezintathu zecylindrical (2).Ii-rotor ezintathu, i-rotor evimbelayo (3) kunye nee-rotors ezimbini zokufuduka (4, 5), zijika kubudlelwane obulungelelanisiweyo ngaphakathi kweebhore.Ii-rotors ezintathu zixhaswa ngamacwecwe okuthwala (6, 7).Iziphelo ze-rotors ziphuma kwiiplate zokuthwala.I-rotor gear blocking (8) ifakwe ekupheleni kwe-rotor yokuthintela.Izixhobo ze-rotor zokufuduka (9, 10) zibekwe ekupheleni kwee-rotors zokufuduka.Ezi giya zenza unxulumano olunexesha phakathi kweerotor ezintathu.

Njengoko ulwelo luhamba kwizindlu zeemitha, indibano ye-rotor iyajika.I-liquid iphukile ibe ngamacandelo afanayo ngama-rotors ajikayo.Ukukhutshwa kolwelo kwenzeka ngaxeshanye.Njengoko ulwelo lungena, enye inxalenye yolwelo iyahlulwa ize ilinganiswe.Kwangaxeshanye, ulwelo oluphambi kwalo lugxothwa ngaphandle kwemitha ukuya kumgca wokukhupha.Ekubeni umthamo we-bores uyaziwa, kwaye umlinganiselo ofanayo we-fluid udlula imitha ngexesha lokuguqulwa kwe-rotor yokuthintela, umthamo ochanekileyo we-liquid oye wadlula kumitha unokumiselwa ngeqondo eliphezulu lokuchaneka.

Le ntshukumo ye-rotary yenyani ihanjiswa nge-packing gland, i-face gear, i-adjuster drive shaft, kunye ne-adjuster kwi-stack yerejista kunye ne-counter.Isiphumo sentshukumo esijikelezayo sithetha ukuchaneka okungaguqukiyo, njengoko isalathiso serejista sikwisivumelwano esichanekileyo kunye nomthamo womthamo wokwenene nangaliphi na ixesha elinikiweyo.Kuyo nayiphi na indawo kumjikelezo, umzimba wemitha, i-rotor evimbayo, kunye nobuncinci enye yeerotor zokufuduka zenza i-capillary seal eqhubekayo phakathi kwemveliso engalinganisiyo yomlambo kunye nemveliso ephantsi kwemitha.

Ngenxa yokuba imveliso ihlulwe ngokutywinwa kwe-capillary, akukho qhagamshelwano lwetsimbi-yentsimbi olufunekayo ngaphakathi kwendawo yokulinganisa.Oku kuthetha ukuba akukho kunxitywa, kwaye akukho kunxitywa kuthetha ukunganyuki kokutyibilika, okuthetha ukuba akukho konakala kokuchaneka.

Kuwo wonke umlinganiselo wokulinganisa, imiphezulu yokukhwelana inokuba yimiphezulu esicaba okanye ubuso becylindrical kunye namacandelo akhiwe ngokuchanekileyo.Le misetyenzana ilula ngokwentelekiso, kunye nenyaniso yokuba akukho zindululo zijikajikayo okanye ziphindaphindanayo kwisixhobo, ivumela unyamezelo olusondele kakhulu noluqhubekayo phakathi kweemitha zokufuduswa kwe-Koeo positive.

Imveliso ehamba ngemitha yenza amandla aguquguqukayo akwi-angles echanekileyo ebusweni be-rotors yokufuduka.Imitha yenzelwe ukuba i-rotor shafts ihlale ikwinqwelo-moya ethe tye.Ezi nyaniso zimbini zikhokelela ekubeni kungabikho nto i-axial thrust.Ke ngoko, iimitha zokufuduswa kwe-Koeo ezintle azidingi i-thrust washers okanye ii-thrust bearings, kwaye ii-rotors zifuna ngokuzenzekelayo umbindi womjelo phakathi kweepleyiti ezithwele iipleyiti ezimbini-ukuphelisa ukuguga phakathi kweziphelo zeerotors kunye neepleyiti ezithwele.Kwakhona, akukho ziphumo zokunxiba zithetha ukuba akukho ukukhathala kwesinyithi kwaye akukho friction.

Iimitha zokufuduswa kwe-Koeo positive zenziwe ngezinto ezahlukeneyo ukuze zilungele iimveliso ezahlukeneyo.Ngenxa yoyilo lwazo olunganxitywayo, i-capillary seal, kunye ne-rotary metering eyodwa, iimitha zokufuduswa kwe-Koeo zibonelela ngokuchaneka okungalinganiyo, ubomi obude bokusebenza, kunye nokuthembeka okukhethekileyo.

 

Iimpawu kunye neenzuzo.

• Iimitha zokufuduswa ezivumayo zinokulinganisa ukuqukuqela kwamaxesha, amazinga okuqukuqela aphantsi kakhulu, kunye nolwelo phantse kuyo nayiphi na i-viscosity.Imitha yePD iyahamba ngoko nangoko xa kukho intshukumo yolwelo, kwaye ngoko nangoko iyayeka xa intshukumo yolwelo iyekile.

• UMlinganiselo wemitha yokufuduka elungileyo awuchatshazelwa yi-viscosity yolwelo, ukuxinana okanye isiphithiphithi kumbhobho.Lonke ulwelo olungacinezelekiyo luya kuhlala kumthamo ofanayo kwaye akukho mfuneko yokulungisa imveliso yemitha ukubuyisela ezi meko.

• Ukuchaneka okuphezulu

• Uxinzelelo oluphantsi luyehla

• Ulungelelwaniso lolungelelwaniso olungena nyathelo

• Nxiba uyilo lwevane olubuyekezayo

• Ukufunda ngoomatshini okanye nge-elektroniki

• Ilungele iintlobo ezininzi zolwelo

• Ii-flowmeters zohlobo lokufuduswa okuhle zikholisa ukunika ukuchaneka okuphezulu okt malunga ne-±0.1% yesantya sokuqukuqela sokwenyani ngamanye amaxesha.Ukuchaneka kokulinganisa kweyunithi kuba ngcono ngokunyuka kwenkqubo ye-viscosity fluid.

• Iimitha zePD zikwabonelela ngokuphinda-phinda okugqwesileyo okunokuba phezulu ukuya kuthi ga kwi-0.05% yokufunda.

• Iimitha zePD zinokusebenza ngaphandle kokusebenzisa umbane.Ngaphezu koko, azinyanzeli ukuba ziqhube umbhobho othe ngqo phezulu nasezantsi ukuze uwafakele.

• Iimitha zePD zikhona ngokobungakanani ukuya kutsho kwi-12.

• Umlinganiselo wabo wokujika unokuba phezulu njenge-100:1.

• Ekubeni iimitha ze-PD zineemvume ezincinci kakhulu phakathi kweendawo zazo ezichanekileyo, ukuguga okukhawulezileyo kuchaphazela ukuchaneka kwazo.Ke ngoko, ezi ntlobo zeemitha aziqhelekanga ukucetyiswa kumlinganiselo we-slurries okanye ulwelo olurhabaxa.

• Iimitha zokufuduswa ezifanelekileyo zidla ngokusetyenziswa njengeemitha zamanzi zasendlwini.

• Ukuchaneka kweeflowmeters ezilungileyo kuxhomekeke ekuthembekeni kwe-capillary seal esetyenziselwa ukwahlula ulwelo oludlulayo lube ziipasile ezifihlakeleyo.Ukufumana ukuchaneka okufunekayo kunye nokuqinisekisa ukuba imitha yePD isebenza ngokufanelekileyo, inkqubo yokucoca iyafuneka.Le nkqubo yokucoca kufuneka ikwazi ngokwaneleyo ukususa amasuntswana obungakanani obukhulu kunye namaqamza erhasi kumpompozo wolwelo.

• I-Positive displacement flowmeters isebenza kumgaqo olula wokusebenza.Ii-flowmeters ezintle zokufuduswa ziquka iirotha ezichanekileyo zokulinganisa ukuhamba kwamanzi.Imiqulu esisigxina yolwelo ihanjiswa phakathi kweerotors.Ukujikeleza kwezi rotor kuhambelana ngokuthe ngqo nomthamo wolwelo oluhanjiswayo.

• Uthungelwano lwe-electronic pulse transmitter luqukiwe kuyilo lwemitha yePD eqhelekileyo ebala inani lokujikeleza kwerotha.Eli nani libalwayo lisetyenziselwa ukubala umthamo wolwelo kunye nesantya sokuhamba.

• Irotha yohlobo lokufuduswa kwe-positive inokwakhiwa ngeendlela ezininzi.

• Iifluithi zokufuduswa ezifanelekileyo zingasetyenzwa phantse kuzo zonke izilwelo ezingenabrasive ezifana ne-oyile yokufudumeza, ioyile yokuthambisa, izongezo zepolymer, amafutha ezilwanyana nemifuno, i-inki yokuprinta, i-freon, njl.