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Sankhani flowmeter ngati mukufuna

Kuthamanga ndi njira yomwe imagwiritsidwa ntchito nthawi zambiri pakupanga mafakitale.Pakadali pano, pali pafupifupi mitundu yopitilira 100 yosiyana pamsika.Kodi ogwiritsa ntchito angasankhe bwanji zinthu zokhala ndi magwiridwe antchito apamwamba komanso mtengo wake?Lero, titenga aliyense kuti amvetsetse mawonekedwe a magwiridwe antchito a ma flow meters.

Kufananiza Mamita Osiyanasiyana Oyenda

Kuthamanga kwamtundu wosiyana

Ukadaulo wosiyanasiyana woyezera kukakamiza pakali pano ndiyo njira yomwe imagwiritsidwa ntchito kwambiri poyezera kuthamanga, yomwe imatha kuyeza kuthamanga kwamadzi am'gawo limodzi ndi madzi omwe ali ndi kutentha kwambiri komanso kuthamanga kwambiri pansi pazikhalidwe zosiyanasiyana zogwirira ntchito.M'zaka za m'ma 1970, lusoli linakhalapo 80% ya msika.Kusiyana kwa kuthamanga kwa flowmeter nthawi zambiri kumakhala ndi magawo awiri, chipangizo chopukutira ndi cholumikizira.Zipangizo zamakono, mbale zodziwika bwino za orifice, nozzles, pitot tubes, uniform velocity tubes, etc. Ntchito ya chipangizo chogwedeza ndikuchepetsa madzi othamanga ndikupanga kusiyana pakati pa kumtunda ndi pansi.Pakati pa zida zosiyanasiyana zopukutira, mbale ya orifice ndiyo yomwe imagwiritsidwa ntchito kwambiri chifukwa cha mawonekedwe ake osavuta komanso kuyika kosavuta.Komabe, ali okhwima zofunika pa miyeso processing.Malingana ngati ikukonzedwa ndikuyika motsatira ndondomeko ndi zofunikira, kuyeza koyenda kungathe kuchitidwa mkati mwamtundu wosatsimikizika pambuyo poti kuyenderako kuli koyenerera, ndipo kutsimikizira kwenikweni kwamadzi sikofunikira.

Zipangizo zonse zopukutira zili ndi kutsika kwapanikizidwe kosabweza.Kutaya kwakukulu kwapanikizi ndiko tsinde lakuthwa lakuthwa, lomwe ndi 25% -40% ya kusiyana kwakukulu kwa chida.Kutaya kwamphamvu kwa chubu la Pitot ndikochepa kwambiri ndipo kumatha kunyalanyazidwa, koma kumakhudzidwa kwambiri ndi kusintha kwamadzimadzi.

Mtundu wamalo osinthika

Chitsanzo choimira mtundu uwu wa flowmeter ndi rotameter.Ubwino wake waukulu ndikuti ndi wolunjika ndipo safuna mphamvu yakunja poyezera pamalopo.

Ma rotameter amagawidwa kukhala ma rotameters agalasi ndi ma rotameter achitsulo malinga ndi kupanga kwawo ndi zida.Galasi ya rotor flowmeter ili ndi dongosolo losavuta, malo a rotor amawoneka bwino, ndipo ndi osavuta kuwerenga.Amagwiritsidwa ntchito kwambiri pa kutentha kwabwino, kuthamanga kwabwino, zowonekera komanso zowononga, monga mpweya, gasi, argon, ndi zina zotero. Zitsulo zachitsulo zozungulira zimakhala ndi zizindikiro zogwirizanitsa maginito, zomwe zimagwiritsidwa ntchito pa kutentha kwakukulu ndi kupanikizika kwambiri, ndipo zimatha kufalitsa muyezo. zizindikiro zogwiritsidwa ntchito ndi zojambulira, etc., kuyeza kuchulukana kwakuyenda.

Pakali pano, pali vertical variable area flowmeter yokhala ndi mutu wamsika wamsika wamsika.Ilibe mtundu wopindika komanso chipinda chotchingira.Ili ndi muyeso wa 100: 1 ndipo imakhala ndi mzere wotuluka, womwe ndi woyenera kwambiri kuyeza kwa nthunzi.

Oscillating

Vortex flowmeter ndi woimira oscillating otaya mamita.Ndiko kuyika chinthu chosasunthika kutsogolo kwamadzimadzi, ndipo madzimadzi amapanga mizere iwiri yokhazikika ya asymmetric vortex kumbuyo kwa chinthucho.Mafupipafupi a sitima ya vortex amafanana ndi liwiro la kuyenda.

Makhalidwe a njira yoyezera iyi sizinthu zosuntha mu payipi, kubwerezabwereza kwa kuwerenga, kudalirika kwabwino, moyo wautali wautumiki, miyeso yambiri yofananira, pafupifupi yosakhudzidwa ndi kusintha kwa kutentha, kuthamanga, kachulukidwe, kukhuthala, etc. .Kulondola kwakukulu (pafupifupi 0.5% -1%).Kutentha kwake kogwira ntchito kumatha kufika pa 300 ℃, ndipo kuthamanga kwake kumatha kufika pa 30MPa.Komabe, kugawa kwamphamvu kwamadzimadzi komanso kuthamanga kwamphamvu kumakhudza kulondola kwa kuyeza.

Makanema osiyanasiyana amatha kugwiritsa ntchito matekinoloje osiyanasiyana owonera ma vortex.Pa nthunzi, chimbale chogwedeza kapena piezoelectric crystal chingagwiritsidwe ntchito.Kwa mpweya, matenthedwe kapena akupanga angagwiritsidwe ntchito.Pamadzi, pafupifupi matekinoloje onse ozindikira amatha kugwiritsidwa ntchito.Monga ma orifice plates, vortex The flow coefficient of street flow mita imatsimikiziridwa ndi seti ya miyeso.

Mphamvu yamagetsi

Mtundu uwu wa flowmeter umagwiritsa ntchito kukula kwa voteji yomwe imapangidwa pomwe ma conductive otaya amayenda kudzera mumlengalenga kuti azindikire kutuluka.Choncho ndi oyenera conductive TV okha.The of theoretically, njira imeneyi si anakhudzidwa ndi kutentha, kuthamanga, kachulukidwe ndi mamasukidwe akayendedwe amadzimadzi, osiyanasiyana chiŵerengero akhoza kufika 100: 1, kulondola ndi za 0.5%, chitoliro m'mimba mwake ndi 2mm kuti 3m, ndipo ambiri. amagwiritsidwa ntchito m'madzi ndi matope, Zamkati kapena muyeso wapakatikati wotuluka.

Chifukwa chofooka chizindikiro, ndielectromagnetic flowmeternthawi zambiri ndi 2.5-8mV pamlingo wathunthu, ndipo kuthamanga kwake kumakhala kochepa kwambiri, ma millivolts ochepa okha, omwe amatha kusokoneza kunja.Choncho, pamafunika kuti nyumba yopatsirana, waya wotchingidwa, ngalande yoyezera, ndi mapaipi omwe ali kumapeto onse a transmitter akhazikitsidwe ndikuyika malo osiyana.Osalumikizana ndi malo opezeka anthu ambiri amagalimoto, zida zamagetsi, ndi zina.

Akupanga mtundu

Mitundu yodziwika bwino ya ma flow meters ndi Doppler flow metre ndi time difference flow metre.Doppler flowmeter imazindikira kuchuluka kwa kuthamanga kutengera kusintha kwa mafunde amawu omwe amawonetsedwa ndi chandamale choyenda mumadzimadzi omwe amayezedwa.Njirayi ndi yoyenera kuyeza madzi othamanga kwambiri.Sikoyenera kuyeza madzi othamanga kwambiri, ndipo kulondola kumakhala kochepa, ndipo kusalala kwa khoma lamkati la chitoliro kumafunika kukhala apamwamba, koma dera lake ndi losavuta.

Kusiyanitsa kwa nthawi flowmeter kumayesa kuchuluka kwa otaya malinga ndi kusiyana kwa nthawi pakati pa kufalikira kwa kutsogolo ndi kumbuyo kwa mafunde akupanga mumadzimadzi a jekeseni.Popeza kukula kwa kusiyana kwa nthawi kumakhala kochepa, pofuna kutsimikizira kuti muyeso wolondola, zofunikira za dera lamagetsi zimakhala zapamwamba, ndipo mtengo wa mita ukuwonjezeka molingana.Kusiyanitsa kwa nthawi flowmeter nthawi zambiri kumakhala koyenera kwamadzimadzi oyenda alaminar okhala ndi gawo la liwiro lothamanga.Pazakumwa zaphokoso, ma flowmeter amitundu yosiyanasiyana atha kugwiritsidwa ntchito.

Momentum rectangle

Mtundu uwu wa flowmeter umachokera pa mfundo yosamalira mphindi yachangu.Madzi amadzimadzi amakhudza gawo lozungulira kuti lizizungulira, ndipo liwiro la gawo lozungulira limakhala lolingana ndi liwiro loyenda.Kenako gwiritsani ntchito njira monga magnetism, optics, ndi makina owerengera kuti musinthe liwiro kukhala chizindikiro chamagetsi kuti muwerenge kuchuluka kwamayendedwe.

Turbine flowmeter ndiyomwe imagwiritsidwa ntchito kwambiri komanso yolondola kwambiri yamtunduwu.Ndizoyenera gasi ndi media zamadzimadzi, koma ndizosiyana pang'ono.Kwa gasi, ngodya yake yolowera ndi yaying'ono ndipo masamba ndi akulu., Kulondola kwa turbine flowmeter kumatha kufika 0.2% -0.5%, ndipo kumatha kufika 0,1% mumtundu wopapatiza, ndipo chiŵerengero cha turndown ndi 10: 1.Kutaya kwamphamvu kumakhala kochepa komanso kukana kukakamiza kumakhala kwakukulu, koma kuli ndi zofunikira zina pa ukhondo wamadzimadzi, ndipo zimakhudzidwa mosavuta ndi kachulukidwe ndi kukhuthala kwamadzimadzi.Kuchepa kwa dzenje m'mimba mwake, kumakhudzanso kwambiri.Monga mbale ya orifice, onetsetsani kuti pali zokwanira musanayambe komanso pambuyo poikapo.Chitoliro chowongoka kuti mupewe kusinthasintha kwamadzimadzi ndikusintha momwe mungayendere pa tsamba.

Kusamuka kwabwino

Mfundo yogwirira ntchito ya chida chamtunduwu imayesedwa molingana ndi kayendetsedwe kake ka madzi okhazikika amadzimadzi pamtundu uliwonse wa thupi lozungulira.Mapangidwe a chidacho ndi osiyana, monga oval gear flowmeter, rotary piston flowmeter, scraper flowmeter ndi zina zotero.Mitundu ya oval gear flowmeter ndi yayikulu, yomwe imatha kufika 20: 1, ndipo kulondola kwake ndikwambiri, koma zida zosunthira ndizosavuta kukakamira zonyansa mumadzimadzi.Kuthamanga kwa unit ya rotary piston flowmeter ndi yayikulu, koma chifukwa chazifukwa zamapangidwe, kuchuluka kwa kutayikira ndikokwera kwambiri.Chachikulu, chosalondola bwino.The positive displacement flowmeter kwenikweni ndi yodziyimira payokha kukhuthala kwamadzimadzi, ndipo ndi yoyenera kwa media monga girisi ndi madzi, koma sizoyenera zowonera monga nthunzi ndi mpweya.

Chilichonse mwazomwe tatchulazi zili ndi ubwino ndi zovuta zake, koma ngakhale zitakhala zamtundu womwewo wa mita, zopangidwa ndi opanga osiyanasiyana zimakhala ndi machitidwe osiyanasiyana.


Nthawi yotumiza: Dec-15-2021