Positive displacement flowmeter

I-Positive displacement flowmeter-PD Amamitha

Uma kuziwa ekukaleni amanani okugeleza kwe-volumetric isiyonke yento ewuketshezi, akukho okusebenza kangcono kunamamitha okugeleza asetshenziswa ezinhlelweni ezihlukahlukene eziphathelene nezinkambu zokusebenza ezihlukene.I-Positive displacement flowmeter ekhona emakethe isetshenziselwa izinhlelo zokusebenza eziningi ezisezingeni eliphezulu, futhi ngayinye yazo inezinzuzo ezihlukene, amanani okusebenza, izici, izindlela, kanye nokucaciswa.

I-Positive displacement Amamitha agelezayo ayizinhlobo zama-flowmeters afanele ukukalwa kokugeleza koketshezi lwe-viscous.Lezi zibuye zibhekwe njengezilungele izinhlelo zokusebenza ezidinga ukusetshenziswa kwesistimu yamamitha emishini elula.Ngokuvamile, imitha yokugeleza enhle iqukethe igumbi noma umgodi ovimbela ukugeleza.Umshini ojikelezayo noma ophindaphindayo utholakala ngaphakathi kwegumbi ukuze ukhiqize amaphasela ahlukene evolumu egxilile oketshezini olugelezayo.Ngamayunithi amamitha e-PD, uketshezi luhlukaniswa lube yizilinganiso ezibalwe ncamashi ezibuye zibalwe ngerejista yokuxhuma.Njengoba konke ukunyuswa okukaliwe kumele ivolumu ehlukile, lezi zinhlobo zamamitha zisetshenziselwa kakhulu i-batching ezenzakalelayo kanye nezinjongo zokubala.

Iyini i-Positive Displacement Flow Meter?

Ukuze uchaze idivayisi, yini i-Positive Displacement flow meter (PD) ?– Imitha eyimishini esetshenziswa kangcono ezintweni ezingagqwali nezihlanzekile.Njengoba ukwazi ukukala uketshezi oluningi oluhlanganisa ngisho nalawo ane-viscosity ephezulu, le mitha yokugeleza iza nezinzuzo eziningana.

Eyaziwa nangokuthi ama-workhorses ezinhlelweni zokulinganisa ukugeleza, le divayisi yokulinganisa izinga lokugeleza ikala izinga lokugeleza kwezinto eziwuketshezi ngokuyivumela ukuthi ihambe ngohlelo ngezitolimende.Uma isetshenziselwa izinhlelo zokusebenza zezimboni, amamitha okugeleza kwe-PD aziwa ngamakhono awo okulinganisa amazinga amaningi okugeleza okuyinkimbinkimbi nabalulekile okugeleza koketshezi ngokunemba nangokulula.

I-Positive Displacement (PD) Amamitha okugeleza amathuluzi okulinganisa ukugeleza kwe-volumetric akala ukugeleza ngokudlulisa umthamo onembile woketshezi ngokuphenduka ngakunye.Amamitha okugeleza e-PD angamathuluzi anembayo izingxenye zawo zangaphakathi ezihambayo ezikhiywe ngomshini wokudonsa amanzi ngokuhambisana nevolumu yoketshezi oluhamba kumitha yokugeleza.

I-Positive Displacement Meter wuhlobo lwemitha yokugeleza edinga uketshezi ukuze isuse izingxenye zemitha ngomshini ukuze kulinganiswe ukugeleza.I-Positive displacement (PD) flow metres ikala izinga lokugeleza kwevolumu yoketshezi olunyakazayo noma igesi ngokuhlukanisa imidiya ibe amavolumu angashintshi, anemitha (ukwanda okulinganiselwe noma amavolumu oketshezi).

Isebenza kanjani i-Positive Displacement Flow Meter?

Isifaniso esiyisisekelo kungaba ukubamba ibhakede ngaphansi kukampompi, uligcwalise lifike ezingeni elimisiwe, bese ulibuyisela ngokushesha elinye ibhakede futhi ulinganise isikhathi isilinganiso lapho amabhakede agcwaliswa ngaso (noma inani eliphelele lamabhakede lokugeleza “okuphelele”) .Ngokucindezelwa okufanele kanye nesinxephezelo sokushisa, izinga lokugeleza kwenqwaba linganqunywa ngokunembile.

Amamitha ochungechunge lwe-Koeo M angamamitha amahle wokufuduka.Zenzelwe ukulinganisa uketshezi kukho kokubili ukudluliselwa kwesitokisi kanye nezinhlelo zokusebenza zokulawula inqubo.Angafakwa kumasistimu wepompo noma amandla adonsela phansi.Ngenxa yokuklama kwazo okulula, kulula ukuzinakekela, futhi kulula ukuzivumelanisa nezinhlelo ezihlukahlukene.

Izindlu zamamitha (1) zakhiwe ngezibhobo eziyisilinda ezintathu (2).Ama-rotor amathathu, i-rotor evimbayo (3) kanye nama-rotor amabili okuthutha (4, 5), aphendulela ubudlelwano obuvumelanisiwe ngaphakathi kwamabhore.Ama-rotor amathathu asekelwa amapuleti aphethe (6, 7).Iziphetho zama-rotors ziphuma ngamapuleti okuthwala.I-rotor gear yokuvimbela (8) ibekwe ekupheleni kwe-rotor evimbela.Amagiya e-rotor ahambayo (9, 10) abekwe emaphethelweni ama-rotor ahambayo.Lawa magiya adala ubudlelwano obunesikhathi obuvumelanisiwe phakathi kwama-rotor amathathu.

Njengoba uketshezi luhamba phakathi kwezindlu zamamitha, umhlangano we-rotor uyaphenduka.I-liquid iphukile ibe izingxenye ezifanayo ngama-rotors aphendukayo.Ukukhishwa kwe-fluid kwenzeka kanyekanye.Njengoba uketshezi lungena, enye ingxenye yoketshezi iyahlukaniswa futhi ikalwe.Ngesikhathi esifanayo, uketshezi olungaphambi kwalo luyasuswa ngaphandle kwemitha lungene emgqeni wokuphuma.Njengoba umthamo we-bores uyaziwa, futhi inani elifanayo loketshezi lidlula imitha ngesikhathi sokuguqulwa ngakunye kwe-rotor evimbelayo, umthamo oqondile we-liquid oye wadlula kumitha unganqunywa ngezinga eliphezulu lokunemba.

Lokhu kunyakaza kwe-rotary kwangempela kudluliselwa ngendlala yokupakisha, igiya lobuso, i-adjuster drive shaft, kanye nesilungisisi kusitaki nekhawunta yerejista.Ukuphuma kokunyakaza kwe-rotary kwangempela kusho ukunemba okungaguquki, njengoba inkomba yerejista ivumelana ngokunembile nomthamo wangempela wokukhipha umthamo nganoma isiphi isikhathi.Kunoma yikuphi ukuma emjikelezweni, umzimba wemitha, i-rotor evimbayo, kanye okungenani neyodwa yama-rotor agudluzayo yenza uphawu lwe-capillary oluqhubekayo phakathi komkhiqizo okhuphuka nomfula ongalinganisiwe kanye nomkhiqizo owenziwe ngamamitha owela phansi.

Ngenxa yokuthi umkhiqizo uhlukaniswe uphawu lwe-capillary, akukho ukuxhumana kwensimbi kuya kwensimbi okudingekayo ngaphakathi kwesici se-metering.Lokhu kusho ukungagugi, futhi ukungagqoki kusho ukuthi akukho ukwanda kokushelela, okusho ukuthi akukho ukuwohloka kokunemba.

Kuwo wonke ama-elementi okulinganisa, izindawo zokukhwelana kungaba yizindawo eziyisicaba noma ubuso obuyisilinda nezigaba ezifakwe ngomshini ngokunembile.Le misebenzi elula uma kuqhathaniswa, kanye neqiniso lokuthi akukho mnyakazo oscillating noma ophindaphindayo ngaphakathi kocingo, ivumela ukubekezelelana okusondelene kakhulu nokungaguquguquki ngaphakathi kwamamitha okufuduka e-Koeo positive.

Umkhiqizo ogeleza kumitha usebenzisa amandla aguquguqukayo asema-engeli alungile ebusweni bama-rotor asukayo.Imitha yakhelwe ngendlela yokuthi ama-rotor shafts ahlale endizeni enezingqimba.Lawa maqiniso amabili abangela ukuthi akukho thrust ye-axial.Ngakho-ke, amamitha we-Koeo positive displacement awadingi ama-thrust washer noma ama-thrust bear, futhi ama-rotor afuna ngokuzenzakalelayo isikhungo somfudlana phakathi kwamapuleti anamapuleti amabili—okuqeda ukuguga phakathi kwamaphethelo ama-rotor nama-bearing plate.Nakulokhu, akukho miphumela yokugqoka isho ukuthi akukho ukukhathala kwensimbi futhi akukho friction.

Amamitha okufuduka e-Koeo positive enziwe ngezinto ezihlukahlukene ukuze afanele imikhiqizo ehlukahlukene.Ngenxa yedizayini yawo engagqoki, ama-capillary seal, kanye ne-rotary metering eyingqayizivele, amamitha okufuduka e-Koeo ahlinzeka ngokunemba okungenakulinganiswa, ukuphila okude kokusebenza, nokwethembeka okukhethekile.

 

Izici nezinzuzo.

• Amamitha wokufuduka angakwazi ukukala ukugeleza kwezikhawu, amazinga okugeleza aphansi kakhulu, noketshezi lwanoma iyiphi i-viscosity.Imitha ye-PD ihamba ngokushesha lapho kukhona ukunyakaza koketshezi, futhi iyama ngokushesha lapho ukunyakaza koketshezi kuma.

• Ukukalwa kwemitha yokugudluza evumayo akuthintwa i-viscosity yoketshezi, ukuminyana noma ukunyakaza kwepayipi.Lonke uketshezi olungenakucindezelwa luzothatha umthamo ofanayo futhi asikho isidingo sokulungisa ukuphuma kwemitha ukuze kunxeshezelwe lezi zici.

• Ukunemba okuphezulu

• Umfutho ophansi wehla

• Ukulungiswa kokulinganisa okungenasinyathelo

• Gqoka idizayini ye-vane enxephezela

• Ukufunda ngomshini noma ngogesi

• Ifanele inhlobonhlobo yoketshezi

• Ama-flowmeters ohlobo lokufuduka okuhle ngokuvamile anikeza ukunemba okuphezulu okungukuthi cishe ±0.1% wesilinganiso sokugeleza sangempela ngezinye izikhathi.Ukunemba kokulinganisa kweyunithi kuba ngcono ngokwanda kwe-viscosity ye-fluid yenqubo.

• Amamitha we-PD nawo ahlinzeka ngokuphindaphinda okuhle kakhulu okungaba phezulu njengo-0.05% wokufunda.

• Amamitha e-PD angasebenza ngaphandle kokusebenzisa ugesi.Ngaphezu kwalokho, awadingi ukugijima kwamapayipi aqondile phezulu nomfula ukuze awafake.

• Amamitha e-PD akhona ngosayizi ongafika ku-12 in.

• Isilinganiso sabo sokwehliswa singafika ku-100:1.

• Njengoba amamitha e-PD enokuvuleka okuncane kakhulu phakathi kwezingxenye zawo ezinomshini onembile, ukuguga okusheshayo kuthonya ukunemba kwawo.Ngakho-ke, lezi zinhlobo zamamitha ngokuvamile aziphakanyiselwa ukukalwa kwama-slurries noma uketshezi olunamanzi.

• Ama-flowmeters ahamba kahle avame ukusetshenziswa njengamamitha amanzi asekhaya.

• Ukunemba kwama-flowmeters amahle ancike ekuthembekeni kwe-capillary seal esetshenziselwa ukuhlukanisa uketshezi oludlulayo lube amaphasela ahlukene.Ukuze uthole ukunemba okudingekayo futhi uqinisekise ukuthi imitha ye-PD isebenza ngokufanele, isistimu yokuhlunga iyadingeka.Le sistimu yokuhlunga kufanele ibe namandla okwanele ukususa izinhlayiya zosayizi omkhulu kanye namabhamuza egesi ekugelezeni koketshezi.

• Ama-flowmeters amahle asebenza ngomgomo olula wokusebenza.Ama-flowmeters amahle ahlanganisa ama-rotor afakwe ngokunemba ukuze kukalwe ukugeleza koketshezi lwenqubo.Imithamo engaguquki yoketshezi ihanjiswa phakathi kwama-rotors.Ukuzungezisa kwalawa ma-rotor kuhambisana ngokuqondile nevolumu yoketshezi oluhanjiswayo.

• I-electronic pulse transmitter emaphakathi ifakiwe kumklamo wemitha ye-PD obala inani lokuzungezisa kwerotha.Le nombolo ebaliwe ibe isisetshenziswa ukubala umthamo owuketshezi nezinga lokugeleza.

• I-rotor yohlobo lwe-flowmeter elungile ingakhiwa ngezindlela eziningi.

• Ama-flowmeters amahle angasetshenziswa cishe kuwo wonke uketshezi olunganabrasi njengamafutha okushisa, amafutha okugcoba, izithasiselo ze-polymer, amafutha ezilwane nemifino, uyinki wokuphrinta, i-freon, njll.