Mamita ekuyerera kwemagetsi(EMFs) dzinoshandiswa zvakanyanya mumabasa emaindasitiri nekuda kwekururama kwazvo uye kuvimbika pakuyeramwero wekuyererayemvura inoyerera. Mamita aya anoshanda zvichibva paMutemo waFaraday weElectromagnetic Induction, musimboti mukuru mu electromagnetism. Chinyorwa chino chinopa tsananguro yakadzama yekuti electromagnetic flow metres inoshanda sei, kubva padzidziso iri pasi kusvika kuzvinhu zvinoshanda uye mashandisirwo azvo.
1. Nheyo dzedzidziso: Mutemo waFaraday weKugadzira Magetsi
Mutemo waFaraday unoti kana kondakita ichifamba nemumunda wemagineti, simba remagetsi (EMF) rinokonzereswa pamutanda. Panyaya yemutara wekuyerera kwemagetsi, mvura inoyerera nemumita inoshanda se "kondakita," nepo munda wemagineti wemukati wemita inoshanda semunda wemagineti wekunze. EMF inokonzerwa inoenderana zvakananga nekumhanya kwemvura, simba remunda wemagineti, uye daro riri pakati pemaelectrodes anoyera EMF.
Pamasvomhu, Mutemo waFaraday unogona kuratidzwa se:
E=k×B×v×D
kupi:
- E isimba remagetsi rinokonzereswa (voltage)
- k chinhu chisingachinji
- B ndiyo simba remagineti
- v ndiyo avhareji yekumhanya kwemvura
- D ndiyo dhayamita yechubhu yekuyera (inomiririra kureba kwemubati mumunda wemagineti)
Sezvo simba remagineti (B) uye dhayamita yechubhu (D) zvakaganhurirwa kune mita yekuyerera yakapihwa, voltage inokonzerwa (E) inova chiyero chakananga chekukurumidza kwemvura (V). Nekubatanidza kumhanya nekufamba kwenguva, mwero wekuyerera (vhoriyamu panguva imwe neimwe) unogona kuverengerwa.
2. Zvikamu zveMuchina weKuyerera kweMagineti
Magnetic Coils kana Magnet Assembly
Iyomita yekuyereraine seti yemagineti coils kana kuti permanent magnet assembly inogadzira simba remagineti rakafanana rakatenderedza divi rekuyerera kwemvura. Simba remagineti rinogona kuva DC (direct - current) kana AC (alternating - current), uye minda yeAC inowanzoonekwa nekuda kwekugona kwayo kuderedza polarization ye electrode uye kupindira kweruzha. Kana simba remagineti reAC rishandiswa, EMF inokonzerwa mumvura inosiyanawo ne sinusoidally, izvo zvinoita kuti kugadzirisa masaini kuve nyore.
Chubhu yekuyera
Chubhu yekuyera ndiyo chikamu chinoshandiswa mvurakuyereras. Inowanzo gadzirwa nezvinhu zvisina magineti uye zvisingafambise magetsi (senge simbi isina ngura yakafukidzwa nePTFE, rabha, kana ceramic) kudzivirira kukanganiswa kwesimba remagineti uye kuve nechokwadi chekuyera kwakarurama. Pamusoro pechubhu pakapfava kuderedza kukweshana uye kurasikirwa nekumanikidzwa, zvichibvumira mvura kuyerera zvakasununguka.
Maerekitirodhi
Maelectrode maviri anoiswa akatarisana pamadziro echubhu yekuyera, akatarisana nekwakanangana nekuyerera kwemvura uye simba remagineti. Maelectrode aya anosangana zvakananga nemvura uye anoshandiswa kuona EMF inokonzerwa. Maelectrode anowanzo gadzirwa nezvinhu zvinodzivirira ngura (semuenzaniso, Hastelloy, platinum - iridium alloy) kuti agone kutsungirira kusvibiswa nemvura dzakasiyana-siyana, kunyanya idzo dzine hukasha kana kuti dzinoparadza.
Chinoshandura Zviratidzo
EMF inokonzerwa nemagetsi inoonekwa nema electrodes chiratidzo chemagetsi chisina kusimba, chinowanzova mu microvolt range. Chinoshandura chiratidzo, chinozivikanwawo se transmitter, chinowedzera, chinosefa, uye chinogadzirisa chiratidzo ichi kuti chishandurwe kuita chinobuda chinoshanda. Chinogona kushandura chiratidzo kuita mafomati akajairwa emagetsi akadai se 4 - 20 mA current loops, masaini edhijitari (semuenzaniso, HART, Modbus), kana kutaurirana pasina waya nemasystem ekudzora, zvichigonesa kutarisa uye kudzora kuyerera kwemhepo panguva chaiyo.
3. Maitiro Ekushanda Nhanho Nenhanho
- Kugadzirwa kweMagineti: Magneti coils kana kuti magnet assembly inogadzira simba remagineti rakagadzikana pamusoro pechubhu yekuyera. Simba iri rakanangana nekwakanangana nekuyerera kwemvura, zvichiita kuti mvura inoyerera inofamba nechubhu icheke nepakati pemitsara yesimba remagineti.
- Kupinza kweEMF: Sezvo mvura inoyerera ichipfuura nemuchubhu yekuyera, inoshanda semuchina unofamba mumunda wemagineti. Sekureva kweMutemo waFaraday, simba remagetsi (EMF) rinokonzereswa mumvura. Hukuru hweEMF iyi hunoenderana nekumhanya kwemvura, simba remunda wemagineti, uye dhayamita yechubhu yekuyera.
- Kuona Zviratidzo: Maelectrode maviri akaiswa pamadziro echubhu anoona EMF inokonzerwa. Sezvo maelectrode acho achisangana nemvura, anobata musiyano wesimba remagetsi unogadzirwa nemvura inofamba mumunda wemagineti.
- Kugadziriswa kweSignali: Chiratidzo cheEMF chisina simba chinoonekwa nemaerekitirodhi chinotumirwa kuchinoshandura chiratidzo. Pano, chiratidzo chinowedzerwa simba kuti chiwedzere simba racho, chichisefa kuti chibvise ruzha nekupindira, uye chinoshandurwa kuita chiratidzo chinobuda chakajairika (semuenzaniso, 4 - 20 mA, data redhijitari).
- Kuverenga Mwero Wekuyerera: Chiratidzo chinogadziriswa chinoshandiswa kuverenga mwero wekuyerera kwemvura. Chinoshandura chiratidzo chinoshandisa masvomhu algorithms zvichibva pane zvinozivikanwa zve flow meter (simba remagineti, dhayamita yechubhu) kushandura EMF yakayerwa kuita mwero wekuyerera, iyo inogona kuratidzwa panzvimbo payo pa meter kana kutumirwa kune remote monitoring system.
4. Zvinhu Zvikuru Zvinofanira Kufungwa Nezvazvo Nemiganhu
Zvinodiwa pakufambisa mvura
Mamita ekuyerera kwemagetsiinogona kuyera chete kuyerera kwemvura inofambisa mhepo. Kuyerera kushoma kunodiwa kunosiyana zvichienderana nemugadziri asi kazhinji kunobva pa5 kusvika 50 μS/cm (micro - Siemens per centimeter). Mvura ine kufambisa mhepo kwakaderera zvakanyanya, senge mvura yakacheneswa zvakanyanya kana mahydrocarbon, haina kukodzera kuyerwa nemaEMF akajairwa. Zvisinei, mamodheru akagadzirirwa mvura ine kufambisa mhepo kwakaderera anogona kuwedzera huwandu hwekuyera.
Kupindirana kweMagineti Munda
Minda yemagineti yekunze inogona kukanganisa mashandiro emamita ekuyerera kwemagetsi. Kuti izvi zvisaitike, kudzivirira uye kudzika kwemita kwakakodzera kwakakosha. Pamusoro pezvo, nzvimbo yekuisa inofanira kusarudzwa nokungwarira kudzivirira kuva pedyo nemidziyo mikuru yemagetsi kana zvimwe zvinobva kumamita emagineti.
Kuiswa uye Kugadziriswa
Kuisa zvakanaka kwakakosha kuti pave nekuyera kwakarurama.mita yekuyererainofanira kuiswa muchikamu chakatwasuka chepombi ine urefu hwakakwana hwepombi dzakatwasuka kumusoro nekuzasi (kazhinji ka5 - 10 dhayamita yepombi kumusoro uye ka3 - 5 pasi) kuti ive nechokwadi chekuti kuyerera kwayo kwakasimba uye kwakafanana. Kuongororwa nguva dzose, kungave kuburikidza nekusimbiswa panzvimbo kana kuenzanisa nemazinga ekuyerera anozivikanwa, kunodiwawo kuchengetedza kururama kwekuyera nekufamba kwenguva.
Mukupedzisa, mita yekuyerera kwemagetsi inoshandisa Mutemo waFaraday weElectromagnetic Induction kuti ipe chaiyo uye yakavimbikakuyerwa kwekuyererayezvinoyerera zvinofambisa mvura. Kunzwisisa mashandiro azvo kwakakosha pakusarudza, kuisa, uye kushanda nemazvo mumaindasitiri akasiyana-siyana, kubva pakuchenesa mvura nekugadzira makemikari kusvika pakugadzira chikafu nezvinwiwa.
Nguva yekutumira: Chikumi-24-2025