Positive displacement flowmeter

Positive displacement flowmeter-PD Meters

Ha ho tluoa tabeng ea ho lekanya kakaretso ea litekanyetso tsa phallo ea volumetric bakeng sa taba ea mokelikeli, ha ho letho le sebetsang hantle ho feta li-flow metres tse sebelisoang lits'ebetsong tse fapaneng tse amanang le masimo a fapaneng a ts'ebetso.Positive displacement flowmeter e teng 'marakeng e sebelisoa bakeng sa lits'ebetso tse' maloa tsa maemo a holimo, 'me e' ngoe le e 'ngoe ea tsona e na le melemo e fapaneng, boleng ba ts'ebetso, likarolo, mekhoa le litlhaloso.

Positive displacement Flow metres ke mefuta ea li-flowmeters tse loketseng ho lekanya phallo ea mokelikeli oa viscous.Tsena li boetse li nkuoa li loketse lits'ebetso tse hlokang ts'ebeliso ea sistimi e bonolo ea mochini.Ka kakaretso, meter e ntle ea phallo e na le kamore kapa sekoti se thibelang ho phalla.Mochini o bilikang o fumaneha ka har'a kamore ho hlahisa liphutheloana tsa discrete tsa molumo o tsitsitseng ho tsoa mokelikeli o phallang.Ka li-unit tsa meter tsa PD, lino tse metsi li aroloa ka li-increments tse baliloeng hantle tse baloang hape ka rejisetara e hokelang.Kaha increment e 'ngoe le e 'ngoe e lekantsoeng e emela molumo o ikhethileng, mefuta ena ea limithara e sebelisoa haholo bakeng sa merero ea boiketsetso le ea accounting.

Positive Displacement Flow Meter ke eng?

Ho hlalosa sesebelisoa, Positive Displacement flow meter (PD) ke eng?- Metara ea mochini e sebelisoang hamolemo bakeng sa lisebelisoa tse sa senyeng le tse hloekileng.Ho ba le bokhoni ba ho lekanya mefuta e mengata ea metsi a kenyelletsang esita le a nang le li-viscosity tse phahameng, meter ena ea phallo e tla le melemo e mengata.

E boetse e tsejoa e le li-workhorses lits'ebetsong tsa tekanyo ea phallo, sesebelisoa sena sa tekanyo ea phallo se lekanya sekhahla sa phallo ea ntho e metsi ka ho e lumella hore e tsamaee ka har'a sistimi ka mekhahlelo.Ha e sebelisoa bakeng sa lits'ebetso tsa indasteri, limithara tsa phallo ea PD li tsejoa ka bokhoni ba tsona ba ho lekanya litekanyetso tse ngata tse rarahaneng le tse bohlokoa tsa phallo ea metsi ka nepo le bonolo.

Positive Displacement (PD) Flow metres ke lisebelisoa tsa ho lekanya phallo ea volumetric tse lekanyang phallo ka ho fetisa molumo o nepahetseng oa mokelikeli ka phetolo e 'ngoe le e 'ngoe.Limithara tsa phallo ea PD ke lisebelisoa tse nepahetseng tseo likarolo tsa tsona tse tsamaeang ka hare li notletsoeng ka har'a metsi ka mokhoa o ts'oanang le molumo oa mokelikeli o tsamaeang ka methareng ea phallo.

Positive Displacement Meter ke mofuta oa meter ea phallo e hlokang mokelikeli ho tlosa likarolo tsa methara molemong oa ho metha phallo.Positive displacement (PD) flow metres e lekanya sekhahla sa phallo ea volumetric ea mokelikeli o tsamaeang kapa khase ka ho arola mecha ea litaba hore e be li-volumes tse tsitsitseng, tse nang le metered (li-increments tse fokolang kapa boholo ba mokelikeli).

Positive Displacement Flow Meter e sebetsa joang?

Papiso ea mantlha e tla be e le ho ts'oara bakete ka tlase ho pompo, ho e tlatsa ho fihla boemong bo behiloeng, ebe o e nkela sebaka ka nkho e 'ngoe ka potlako le nako eo linkho li tlatsoang ka eona (kapa palo eohle ea libakete bakeng sa phallo ea "kakaretso") .Ka khatello e loketseng le matšeliso a mocheso, sekhahla sa phallo ea bongata se ka khethoa ka nepo.

Koeo M series metres ke metha e ntle ea phalliso.Li etselitsoe ho lekanya mokelikeli lits'ebetsong tse peli tsa phetisetso le ts'ebetso ea taolo.Li ka kenngoa tsamaisong ea pompo kapa ea matla a khoheli.Ka lebaka la moralo oa tsona o bonolo, li bonolo ho li hlokomela, 'me li bonolo ho ikamahanya le mefuta e fapaneng ea litsamaiso.

Ntlo ea mithara (1) e entsoe ka liboro tse tharo tsa cylindrical (2).Li-rotor tse tharo, rotor e thibelang (3) le li-rotor tse peli tsa displacement (4, 5), li fetola kamano e lumellanang ka har'a bores.Li-rotor tse tharo li tšehetsoa ke lipoleiti tse jereng (6, 7).Lipheletsong tsa li-rotor li hlahella ka har'a lipoleiti tse jereng.Sesebelisoa sa ho thibela rotor (8) se behiloe qetellong ea rotor e thibelang.Li-gear tsa rotor (9, 10) li behiloe lipheletsong tsa li-rotor tsa phalliso.Li-gear tsena li theha kamano ea nako e lumellanang pakeng tsa li-rotor tse tharo.

Ha mokelikeli o ntse o tsamaea ka har'a ntlo ea mithara, kopano ea rotor e fetoha.Mokelikeli o arotsoe ka likarolo tse tšoanang ka li-rotor tse fetohang.Phallo ea metsi e etsahala ka nako e le 'ngoe.Ha mokelikeli o kena, karolo e ’ngoe ea mokelikeli e ntse e aroloa ’me e lekanngoa.Ka nako e ts'oanang, mokelikeli o ka pele ho oona o tlosoa ka ntle ho mithara ebe o kena moleng oa ho tsoa.Kaha molumo oa li-bores o tsejoa, 'me tekanyo e lekanang ea mokelikeli o feta mithara nakong ea phetoho e' ngoe le e 'ngoe ea rotor e thibelang, molumo o nepahetseng oa metsi o fetisitseng meter o ka khethoa ka tekanyo e phahameng ea ho nepahala.

Motsamao ona oa 'nete oa rotary o fetisoa ka tšoelesa ea ho paka, giya ea sefahleho, shaft ea "adjuster drive" le "adjuster" ho "register stack" le "counter".Motsamao oa 'nete oa rotary o bolela ho nepahala ho sa fetoheng, kaha lets'oao la rejisetara le lumellana hantle le molumo oa 'nete oa molumo hanghang.Boemong bofe kapa bofe ba potoloho, 'mele oa mithara, rotor e thibelang, le bonyane e le' ngoe ea li-rotor tse tsamaisang sebaka li theha tiiso e tsoelang pele ea capillary pakeng tsa sehlahisoa se sa tsitsang se holimo le sehlahisoa sa metered downstream.

Hobane sehlahisoa se arotsoe ke tiiso ea capillary, ha ho na puisano ea tšepe le tšepe e hlokahalang ka har'a karolo ea metering.Sena se bolela ho se aparoe, 'me ha ho apara ho bolela hore ha ho na keketseho ea ho thella, ho bolelang hore ha ho na ho senyeha ha ho nepahala.

Ho pholletsa le karolo ea metering, libaka tsa ho nyalana e ka ba libaka tse bataletseng kapa lifahleho tsa cylindrical le likarolo tse entsoeng ka nepo.Ts'ebetso ena e batlang e le bonolo ea mochini, hammoho le taba ea hore ha ho na metsamao e feto-fetohang ka har'a sesebelisoa, e lumella mamello e haufi haholo le e sa fetoheng ka har'a limithara tsa phalliso tse ntle tsa Koeo.

Sehlahisoa se phallang ka mithara se fana ka matla a matla a nang le li-angles tse nepahetseng ho lifahleho tsa li-rotor tse falla.Metha e entsoe e le hore li-rotor shafts li lule li le sefofaneng se otlolohileng.Lintlha tsena tse peli li etsa hore ho se be le ts'ebetso ea axial.Ka hona, limithara tsa ho falla ha Koeo ha li hloke li-washer kapa li-thrust bearings, 'me li-rotor li batla bohareng ba molatsoana pakeng tsa lipoleiti tse peli tse nang le lipoleiti-ho tlosa ho roala pakeng tsa lipheletso tsa lirotho le lipoleiti tse belehang.Hape, ha ho na liphello tsa ho apara ho bolela hore ha ho na mokhathala oa tšepe 'me ha ho na likhohlano.

Limithara tsa phalliso tsa Koeo positive li entsoe ka lisebelisoa tse fapaneng tse lumellanang le lihlahisoa tse fapaneng.Ka lebaka la moralo oa tsona o sa aparoeng, li-capillary seal, le metering e ikhethang ea rotary, Koeo positive displacement metres e fana ka ho nepahala ho sa leka-lekaneng, bophelo bo bolelele ba ts'ebetso, le ts'epo e ikhethang.

 

Likarolo le melemo.

• Limithara tse ntle tsa ho falla li ka lekanya phallo ea nako le nako, likhahla tse tlase haholo, le maro a hoo e ka bang viscosity efe kapa efe.Methara ea PD e tsamaea hang-hang ha ho e-na le motsamao oa mokelikeli, 'me hang-hang oa emisa ha motsamao oa mokelikeli o emisa.

• Tekanyo ea mitha e ntle ea phalliso ha e amehe ke viscosity ea mokelikeli, ho teteana kapa ho ferekanngoa ha phala.Mekelikeli eohle e sa hatelleheng e tla nka bophahamo bo lekanang 'me ha ho hlokahale ho lokisa tlhahiso ea methara ho lefella lintlha tsena.

• Ho nepahala ho phahameng

• Khatello e tlase e theoha

• Phetoho e se nang mohato

• Ho roala moralo oa li-vane

• Ho bala ka mechini kapa ka elektroniki

• E loketse mefuta e mengata ea metsi

• Positive displacement type flowmeters hangata e fana ka ho nepahala ho phahameng ke hore hoo e ka bang ±0.1% ea sekhahla sa phallo ea 'nete ka linako tse ling.Ho nepahala ha metering ea yuniti ho ntlafala ka keketseho ea ts'ebetso ea viscosity ea mokelikeli.

• Limithara tsa PD li boetse li fana ka mokhoa o babatsehang oa ho pheta-pheta o ka bang holimo ho 0.05% ea ho bala.

• Limithara tsa PD li ka sebetsa ntle le ho sebelisa motlakase.Ho feta moo, ha ba hloke hore liphaephe tse otlolohileng holimo le tse tlase ho li kenye.

• Limithara tsa PD li teng ka boholo ho fihla ho 12 in.

• Karo-karolelano ea bona e ka ba holimo ho 100:1.

• Kaha li-meter tsa PD li na le liphaello tse nyenyane haholo pakeng tsa likarolo tsa tsona tse entsoeng ka mokhoa o nepahetseng, ho apara ka potlako ho susumetsa ho nepahala ha tsona.Ka hona, mefuta ena ea limithara hangata ha e khothalletsoe ho metha li-slurries kapa maro a abrasive.

• Positive displacement flowmeters hangata e sebelisoa e le limithara tsa metsi malapeng.

• Ho nepahala ha li-flowmeters tse ntle ho itšetlehile ka ho tšepahala ha capillary seal e sebelisoang ho arola mokelikeli o fetang ka liphutheloana tsa discrete.Bakeng sa ho fumana ho nepahala ho hlokahalang le ho etsa bonnete ba hore meter ea PD e sebetsa ka mokhoa o nepahetseng, ho hlokahala mokhoa oa ho hloekisa.Sistimi ena ea filthara e lokela ho ba le bokhoni bo lekaneng ba ho tlosa likaroloana tsa boholo bo boholo hammoho le lipompong tsa khase phallo ea mokelikeli.

• Positive displacement flowmeters e sebetsa ka mokhoa o bonolo haholo oa ts'ebetso.Li-flowmeters tse ntle li na le li-rotor tse kentsoeng hantle bakeng sa ho lekanya phallo ea mokelikeli.Methapo e tsitsitseng ea metsi e tsamaisoa pakeng tsa li-rotor.Ho potoloha ha li-rotor tsena ho lekana ka kotloloho le molumo oa mokelikeli o ntseng o tsoela pele.

• Transmitter e bohareng ea elektronike e kenyelelitsoe moahong o tloaelehileng oa metara oa PD o balang palo ea lipotoloho tsa rotor.Nomoro ena e baloang e sebelisoa ho bala bophahamo ba metsi le sekhahla sa phallo.

• Rotor ea mofuta o motle oa phallo ea phallo e ka etsoa ka mekhoa e mengata.

• Positive displacement flowmeters e ka sebelisoa bakeng sa hoo e ka bang maro 'ohle a sa chesehang joalo ka oli e futhumatsang, oli ea ho tlotsa, li-additives tsa polima, mafura a liphoofolo le meroho, enke ea khatiso, freon, joalo-joalo.