Qhov Tsis Pom Zoo: Yog vim li cas Internal Construction Matters ntau npaum li cov ntaub ntawv sheath
Tso lus
Thaum tham txog yuav ua li cas zoo ntawm ib lub tshuab rhaub dej kub ua haujlwm, cov khoom siv sheath yog qhov tseem ceeb tshaj plaws los xav txog. Nws yuav yog 316 stainless hlau rau corrosion kuj los yog Incoloy 840 rau kub kub. Tab sis kuj tseem muaj qee yam tseem ceeb hauv lub raj hlau: cov ntxhia rwb thaiv tsev thiab cov coil tiv taus. Ob lub tshuab tso cua sov nrog tib lub 304 stainless hlau sheaths tuaj yeem siv sijhawm ntev heev thiab ua haujlwm sib txawv nyob ntawm seb lawv ua tau zoo li cas ntawm sab hauv. Paub txog tej yam no tuaj yeem pab koj nkag siab tias vim li cas qee lub tshuab cua sov tawg sai sai, txawm tias "txoj cai" sheath.
Cov hlau tsis muaj zog uas ua rau lub hauv paus ntawm lub tshuab cua sov feem ntau yog coiled rau hauv lub caij nplooj ntoos hlav -zoo li cov duab. Nws tuaj yeem ua los ntawm nickel-chromium (NiCr) lossis hlau-chromium- txhuas (FeCrAl). Cov kauj no yog faus rau hauv cov hmoov ntim nruj, uas feem ntau yog magnesium oxide (MgO). Qhov MgO no ua ob yam tseem ceeb: nws ua kom lub kauj nyob ntawm kov lub hauv paus hauv qab thiab nws txav cua sov los ntawm kauj mus rau hauv lub plhaub. Qhov ceev thiab qhov zoo ntawm MgO packing no tseem ceeb heev.
Txhawm rau ua kom siab- cov khoom zoo, MgO hmoov yog compressed nyob rau hauv siab heev, feem ntau yog siv cov txheej txheem vibrating lossis swaging. Qhov no ua rau nws muaj qhov "density factor." Dense MgO muaj cov thermal conductivity zoo dua, uas ua rau nws yooj yim dua rau cua sov los ntawm lub kauj mus rau hauv lub plhaub. Qhov no txhais tau hais tias lub kauj nws tus kheej ua haujlwm txias dua ntawm qhov ntsuas kub ntawm lub plhaub, uas txo qis kev ntxhov siab rau nws thiab ua rau nws kav ntev dua. Qhov tseem ceeb tshaj, tuab MgO khaws nws cov insulating (dielectric) zoo dua thaum nws yog cua sov thiab txias thiab thaum nws yog shaken. Yog tias cov khoom ntim tsis nruj txaus, nws yuav ua rau "qhov kub thiab txias," thiab dhau sijhawm, hluav taws xob tiv thaiv ntawm lub kauj thiab lub plhaub tuaj yeem tawg, uas tuaj yeem ua rau lub hauv paus tsis ua haujlwm.
Hom kab hluav taws xob uas koj siv kuj tseem ceeb. NiCr alloys, xws li Nichrome, hloov tau, muaj qhov txo qis, thiab ruaj khov nyob rau hauv oxidizing ib puag ncig. Lawv yog cov kev xaiv nrov tshaj plaws. FeCrAl alloys, zoo li Kanthal, tuaj yeem ua haujlwm ntawm qhov kub thiab txias thiab tiv thaiv oxidation zoo heev, txawm tias lawv nkig ntau dua. Lub qhov dej- ua ib lub tshuab rhaub dej kub muaj lub kauj uas ua los ntawm ib qho "watt ntom" (watts ib square inch ntawm coil nto) kom nws nyob hauv qhov kub thiab txias rau txoj haujlwm.
Thaum lub rhaub tau muab tso rau hauv kev ntxhov siab, cov qauv sab hauv no yog qhov ua rau nws sawv. Xav txog thermal cycling, uas yog thaum ib yam dab tsi sov thiab txias dua thiab dua, xws li hauv cov tshuab molding lossis cov khoom sib khi. Lub kauj, MgO, thiab sheath tag nrho hloov loj ntawm ntau yam ceev. Qhov no tuaj yeem ua rau lub kauj txav mus rau hauv lub tshuab cua sov uas tsis nruj nreem ntim, uas tuaj yeem tsim luv luv Circuit Court lossis hauv cheeb tsam overheating. Lub kauj nyob hauv qhov chaw vim tias MgO core yog nruj heev, uas ua rau nws txav tsis tau. Lub siab- qhov ceev ceev tseem txwv tsis pub MgO los ntawm kev nyob hauv cov ntawv thov uas muaj kev vibration, xws li hauv cov tshuab ntim khoom lossis cov khoom siv txawb. Yog tias MgO tau txiav txim siab, nws yuav ua rau qhov tsis muaj thiab qhov tsis ua tiav.
Tsis tas li ntawd, qhov kev txiav tawm, uas yog qhov chaw coil coj mus rau sab nraud lub zog pins, yog qhov tseem ceeb heev. Txhawm rau tiv thaiv thermal expansion thiab kev vibration, koj xav tau ib lub zog mechanical crimp lossis weld uas zoo - insulated. Qhov kev txiav tsis zoo yog ib qho ua rau ua tsis tiav thaum ntxov uas tsis muaj dab tsi cuam tshuam nrog cov ntaub qhwv.
Nws yog qhov tseeb tias qhov no txhais tau li cas hauv lub neej tiag tiag: tsim cov khoom siv sheath (xws li 321 stainless hlau) saib xyuas qhov chaw sab nraud, tab sis nws tsis lav tias lub rhaub yuav muaj zog rau sab hauv. A company that makes high-quality cartridge heaters spends money on regulated processes to make sure the MgO density is as high as possible, the coil winding is accurate, and the terminations are safe. Qhov kev ncaj ncees ntawm lub hauv paus no yog qhov ua rau cov khoom siv sheath ua nws txoj haujlwm zoo rau ntau txhiab lub voj voog.
Yog li, thaum saib ib lub tshuab rhaub dej kub, cov lus nug kev tshaj lij yuav tsum dhau mus dhau ntawm daim ntawv qhia tshwj xeeb. Nws tseem yog ib qho tseem ceeb uas yuav tau nug txog MgO density cov cai, coil txhawb tshuab, thiab txoj kev txiav tawm. Rau kev xav tau siv uas yuav tsum tau caij tsheb kauj vab, kev vibration, lossis kev ntseeg siab heev, cov qauv tsim sab hauv no yog qhov sib txawv ntawm lub rhaub dej kub uas ua tau raws li cov kev qhia tshwj xeeb los ntawm ib qho uas tshaj qhov kev cia siab rau kev ua haujlwm ntev.
