Lub hauv paus ntsiab lus ua haujlwm ntawm thermocouples

Thermocouples ua hauj lwm raws li cov hauv paus ntsiab lus ntawm thermoelectric txoj kev xav: raws li tau hais los saum toj no, thaum qhov kub ntawm qhov kub kawg hloov pauv mus rau qhov kub ntawm qhov txias kawg, lub kaw Circuit Court uas muaj cov hlau tsis sib xws yuav ua rau muaj kev hloov hluav taws xob.
Txhawm rau kom nkag siab ntau ntxiv txog kev ua haujlwm ntawm lub hauv paus ntsiab lus no, ib tus tuaj yeem xav txog tias thaum lub lauj kaub hauv qab yog muab tso rau ntawm lub qhov cub roj, thermal zog yuav sai sai hloov ntawm tus kov mus rau qhov kub qis kawg ntawm tes. Qhov tseeb, hluav taws xob hluav taws xob kuj tau pauv mus rau hauv txoj kev no, tab sis cov nyhuv tsis pom tseeb.
Yog vim li cas rau qhov no yog vim hais tias muaj qhov kub thiab txias sib txawv ntawm ob "qhov kawg" ntawm lub voj voog: thaum qhov kub sib txawv ntawm qhov kawg ua rau lub zog hluav taws xob, qhov tam sim no raug tsim, thiab cov thermocouples siv cov voltmeter nrog los ntsuas qhov tam sim no. Yog tias lub thermocouple paub tias muaj qhov kub thiab txias ntawm qhov kawg ntawm qhov kub qis, nws tuaj yeem siv cov kev ntsuas hluav taws xob no los ntsuas qhov ntsuas qhov ntsuas kub ntawm qhov kub kawg.
Lwm lub ntsiab lus yuav tsum nco ntsoov yog tias qhov kub ntawm ob qhov kawg ntawm qhov kawg yog tib yam, lub zog hluav taws xob tsim tawm ntawm txhua qhov kawg yuav tshem tawm ib leeg, ua rau cov net tam sim no ntws los ntawm qhov kawg mus rau xoom.
Hom thermocouple
Raws li tau hais ua ntej, ntau hom thermocouples raug muag hauv kev ua lag luam niaj hnub no, txhawm rau hais txog cov xwm txheej sib txawv ntawm daim ntawv thov lossis ib puag ncig cov teeb meem, tshwj xeeb tshaj yog nyob rau hauv qhov sib txawv ntawm qhov kub thiab txias. Lawv feem ntau txawv ntawm cov ntawv, thiab cov qib thermocouple feem ntau yog J, K, L, N, thiab T.
Cov ntawv no yog tsim los sawv cev rau cov hlau sib txawv uas siv rau hauv cov thermocouple circuit terminals. Qhov no yuav cuam tshuam ncaj qha rau tag nrho qhov kub thiab txias rhiab heev thiab kev nyab xeeb kev ua haujlwm ntawm cov khoom siv.
Hauv seem no ntawm phau ntawv qhia no, peb yuav qhia qee yam sib txawv thiab kev teeb tsa ntawm cov thermocouples kom nkag siab txog lawv qhov chaw siv thiab qhov kub thiab txias.
K-hom thermocouple
Hom kev siv ntau tshaj plaws hauv ntau qhov kev lag luam thiab chaw ua haujlwm. K-hom thermocouple yog tsim los ntawm ntau cov nickel raws li xov hlau (feem ntau yog chromium alloy / aluminium alloy), uas yog tus nqi zoo heev thermocouple uas tuaj yeem ua tiav qhov tseeb ntawm kev ua haujlwm kub ntau.
K-hom thermocouples feem ntau yog siv nyob rau hauv thaj tsam ntawm -200 mus rau +1260 degree, nrog tus qauv sib txawv ntawm qhov tseeb ntawm ± 0.75%.
K-hom thermocouples siv cov khoom siv npib tsib xee thiab muaj ntau yam kev siv tau, uas yog, lawv cov xov hlau tuaj yeem tsim nyog rau qhov kub thiab txias, thiab lawv kuj muaj qhov ruaj khov corrosion thiab oxidation tsis kam.
K-hom thermocouple xov hlau feem ntau muaj li ntawm 90% npib tsib xee thiab 10% chromium raws li qhov zoo electrode, thiab kwv yees li 95% npib tsib xee, 2% txhuas, 2% manganese, thiab 1% silicon raws li qhov tsis zoo electrode.

J-hom thermocouple
Qhov no yog lwm hom kev siv dav, nrog rau qhov kub thiab txias me dua li ntawm K-hom thermocouples (-40 txog +750 degree), thiab lawv lub neej tag nrho yuav luv luv yog tias raug kub siab ntau zaus. Qhov zoo electrode ntawm J-hom thermocouple yog ua los ntawm cov hlau hlau, thiab cov electrode tsis zoo yog ua los ntawm tooj liab nickel (constantan) alloy.
Nws yog ib qho pheej yig thermocouple nrog ntau yam kev siv, tshwj xeeb tshaj yog tsim nyog rau kev txo qis (tsis yog oxidizing) cov huab cua thiab lub tshuab nqus tsev, muaj peev xwm nyeem cov ntaub ntawv los ntawm ntau hom qub ntawm cov khoom siv thiab cov ntaub ntawv inert. Txawm li cas los xij, cov hlau nyob rau hauv J-hom thermocouple yog yooj yim oxidized, thiab nws tsis pom zoo kom siv hom no yog tias lub thermocouple yuav tsum tau ya raws.
Thermocouples 5
N-hom thermocouple
Cov hlau yog tsim los ntawm nickel chromium silicon nickel silicon alloy (nickel, chromium, thiab silicon), nrog rau kev ua haujlwm kub ntawm -270 rau +1300 degree, thiab ntau yam zoo ib yam li K-hom thermocouples.
Tab sis lawv cov nqi yog me ntsis siab dua li ntawm K-hom thermocouples vim tias lawv kov yeej qee yam teeb meem uas K-hom thermocouples yuav muaj nyob rau hauv ib puag ncig tshwj xeeb thiab yog cov khoom tsim tshiab. Tsis tas li ntawd, N-hom thermocouples tuaj yeem muab kev ruaj ntseg zoo dua rau cov ntawv siv nuclear, thiab piv rau K-hom thermocouples, lawv muaj peev xwm tiv taus qhov kub thiab txias.
Thermocouples 6
T-hom thermocouple
Siv cov khoom siv tooj liab constantan alloy hlau, nrog rau qhov kub thiab txias ntawm -200 rau +350 degree, nws yog qhov tshwj xeeb ruaj khov thermocouple configuration. Nws yog qhov tsim nyog rau ntau yam kev siv kub thiab kub tsis tshua muaj kub, nrog rau ntau yam kev kuaj mob thiab kev sib sib zog nqus khov, thiab tuaj yeem ua haujlwm zoo hauv oxidizing cua. Tsis tas li ntawd, nws tsuas yog muaj tooj liab hlau nyob rau hauv kev sib cuag ncaj qha nrog rau kev sojntsuam thiab tseem tuaj yeem siv rau kev ntsuas qhov sib txawv.