Kev siv cov thermocouples kom raug tsis yog tsuas yog ua kom paub tseeb qhov ntsuas kub thiab cov khoom lag luam zoo tab sis kuj tseem txuag cov khoom siv thermocouple, yog li txuag nyiaj thiab lav cov khoom zoo. Kev teeb tsa tsis raug, thermal conductivity, thiab lub sijhawm lag luam yuam kev yog qhov tseem ceeb ntawm kev ua yuam kev hauv kev siv thermocouple.
1. yuam kev qhia los ntawm kev teeb tsa tsis raug
Piv txwv li, qhov chaw teeb tsa thiab qhov tob tob ntawm lub thermocouple yuav tsis cuam tshuam qhov tseeb ntawm qhov cub. Nyob rau hauv lwm yam lus, lub thermocouple yuav tsum tsis txhob ntsia heev ze rau ntawm lub qhov rooj los yog cua sov ntsiab, thiab qhov tob qhov tob yuav tsum yog tsawg kawg yog 8-10 npaug ntawm txoj kab uas hla ntawm lub raj tiv thaiv; qhov sib txawv ntawm cov thermocouple cov ntaub thaiv npog thiab cov phab ntsa tsis muaj cov khoom siv insulating, ua rau cov cua sov khiav tawm ntawm lub cub tawg lossis cua txias nkag mus. Yog li ntawd, qhov sib txawv ntawm cov thermocouple tiv thaiv raj thiab lub qhov cub phab ntsa yuav tsum tau muab khi nrog cov av nplaum refractory los yog asbestos hlua los tiv thaiv convection ntawm huab cua kub thiab txias los ntawm kev cuam tshuam qhov tseeb ntawm qhov ntsuas kub; Qhov txias hlws ris ntawm lub thermocouple yog ze rau ntawm lub qhov cub lub cev, ua rau kub siab tshaj 100 degree; cov thermocouple yuav tsum tau muab ntsia kom deb ntawm qhov muaj zog sib nqus thiab hluav taws xob raws li qhov ua tau, yog li cov thermocouple thiab fais fab cables yuav tsum tsis txhob muab ntsia rau hauv tib lub raj kom tsis txhob cuam tshuam thiab ua yuam kev; Lub thermocouple tsis tuaj yeem ntsia tau rau hauv cov cheeb tsam uas ntsuas qhov nruab nrab tsis tshua muaj ntws. Thaum siv lub thermocouple los ntsuas qhov ntsuas kub ntawm cov pa hauv cov yeeb nkab, lub thermocouple yuav tsum tau muab ntsia rau ntawm qhov kev taw qhia ntawm kev khiav thiab kev sib cuag nrog cov roj.
2. Kev ua yuam kev qhia los ntawm kev puas tsuaj ntawm rwb thaiv tsev
Piv txwv li, yog tias cov thermocouple insulated tsis zoo, lossis yog tias muaj av ntau dhau los yog ntsev seem ntawm cov raj tiv thaiv thiab lub davhlau ya nyob twg thaiv, ua rau tsis zoo rwb thaiv tsev ntawm cov thermocouple ncej thiab cov phab ntsa rauv, qhov no yog qhov hnyav dua ntawm qhov kub thiab txias. Qhov no yuav tsis tsuas yog ua rau poob ntawm thermoelectromotive quab yuam tab sis kuj qhia txog kev cuam tshuam, thiab qhov tshwm sim yuam kev tuaj yeem ncav cuag ntau pua degrees.
3. yuam kev qhia los ntawm thermal inertia
Vim lub thermal inertia ntawm lub thermocouple, qhov ntsuas qhov taw qhia tus nqi lags tom qab qhov hloov pauv ntawm qhov ntsuas kub. Cov nyhuv no yog qhov tshwj xeeb tshaj yog thaum ntsuas nrawm. Yog li ntawd, cov thermocouples nrog thinner thermoelectrodes thiab me me tiv thaiv txoj kab uas hla yuav tsum tau siv thaum twg los tau. Yog tias qhov ntsuas ib puag ncig tso cai, lub raj tiv thaiv tuaj yeem raug tshem tawm. Raws li kev ntsuas lag luam, qhov amplitude ntawm qhov kub hloov pauv tau pom los ntawm cov thermocouple yog me dua qhov amplitude ntawm qhov cub kub hloov pauv. Qhov loj dua qhov ntsuas lag luam, qhov me me ntawm qhov hloov pauv ntawm cov thermocouple, thiab qhov sib txawv ntawm qhov kub ntawm qhov cub. Thaum siv cov thermocouple nrog lub sij hawm loj tas mus li rau qhov ntsuas kub los yog tswj, txawm hais tias qhov ntsuas kub ntawm qhov ntsuas tau hloov pauv me ntsis, qhov ntsuas kub ntawm lub cub tawg yuav hloov pauv ntau. Txhawm rau ntsuas qhov ntsuas kub kom raug, lub thermocouple nrog lub sijhawm me me yuav tsum tau xaiv. Lub sij hawm tas li yog inversely proportional rau lub tshav kub hloov coefficient thiab ncaj qha proportional rau txoj kab uas hla ntawm lub thermocouple lub kub hlws ris, qhov ntom ntawm cov khoom, thiab cov cua kub tshwj xeeb. Txhawm rau txo lub sij hawm tas mus li, ntxiv rau kev ua kom cov cua sov hloov coefficient, txoj hauv kev zoo tshaj plaws yog kom txo qhov loj ntawm qhov kub ntawm qhov sib txuas. Hauv kev xyaum, cov ntaub ntawv uas muaj cov thermal conductivity zoo feem ntau yog siv, nrog rau nyias-walled, me{11}} txoj kab uas hla tiv thaiv. Hauv kev ntsuas kub kom meej dua, liab qab- hlau thermocouples tsis muaj cov raj tiv thaiv tau siv, tab sis cov thermocouples no tau yooj yim puas thiab yuav tsum tau ntsuas thiab hloov tam sim ntawd.
4. Thermal Resistance yuam kev
Thaum qhov kub thiab txias, yog ib txheej ntawm cov hmoov av los yog hmoov av accumulates nyob rau hauv lub raj tiv thaiv, lub thermal kuj nce, inhibiting tshav kub conduction. Hauv qhov no, qhov ntsuas kub tau qhia yuav qis dua qhov tseeb ntawm qhov ntsuas kub. Yog li ntawd, sab nraud ntawm lub thermocouple tiv thaiv raj yuav tsum tau ceev kom huv si kom txo tau qhov yuam kev
