Qhov cuam tshuam ntawm lub zog ntom ntom ntawm kev ua tau zoo ntawm Cartridge rhaub hauv lub tshuab nqus tsev cua sov

Power density is one of the most important things to think about when designing cartridge heaters. Ntau lub tuam txhab tsis paub ntau npaum li cas nws cuam tshuam zoo npaum li cas cov tshuab cua sov ua haujlwm hauv lub tshuab nqus tsev cua sov. Lub zog ntom ntom ( ntsuas hauv W / cm², lossis watts ib square centimeter) ntawm lub tshuab hluav taws xob lub tshuab hluav taws xob cuam tshuam ncaj qha rau nws kom sov sai npaum li cas, nws sib npaug li cas, thiab nws kav ntev npaum li cas. Nws yog ib qho tseem ceeb heev uas yuav tau xaiv lub hwj chim kom raug rau lub tshuab nqus tsev cua sov kom ua haujlwm zoo. If the power density is too high or too low, it can cause a number of difficulties, such as overheating in certain areas, a shorter service life, and uneven heating.

Ua ntej, peb yuav tsum paub meej txog dab tsi lub hwj chim ceev ntawm cartridge heaters txhais tau hais tias: nws yog tag nrho lub zog ntawm lub rhaub muab faib los ntawm thaj tsam ntawm lub rhaub uas ua rau cov khoom ua kom sov. Qhov zoo ntawm cov cua sov saum npoo av yog ib feem ntawm lub tshuab rhaub dej kub uas yog nyob rau hauv kev sib cuag nrog cov khoom rhuab los yog muaj kev koom tes hauv kev hloov cua sov. Rau cov cua sov cartridge uas tau muab tso rau hauv qhov chaw teeb tsa, qhov chaw ua haujlwm cua sov zoo yog ib feem ntawm lub rhaub dej kub uas tau muab tso rau hauv lub qhov. Raws li kev paub dhau los, lub zog ntom ntom ntawm cov khoom siv hluav taws xob siv hauv lub tshuab nqus tsev yuav tsum ua tib zoo sib piv rau qhov kub thiab txias uas lawv yuav ua hauj lwm thiab cov thermal conductivity ntawm cov khoom raug rhuab. Lub zog ceev yuav tsum qis dua thaum qhov kev khiav hauj lwm kub siab dua thiab thermal conductivity ntawm cov khoom rhuab qis dua.


Rau qis- daim ntawv thov cua sov lub tshuab nqus tsev kub (qis dua 400 degree), zoo li lub tshuab nqus tsev ziab, qis- qhov kub ntawm lub tshuab nqus tsev kub, thiab kev txuag lub tshuab nqus tsev, lub tshuab cua sov feem ntau muaj lub zog ceev ntawm 5-7 W / cm². This power density range can guarantee quick heating without causing local overheating. Qhov no yog vim lub tshuab rhaub dej kub ua haujlwm qis, yog li cov cua sov uas nws tsim tau tuaj yeem hloov mus rau cov khoom siv hluav taws xob los ntawm kev ua kom sov. Piv txwv li, lub tshuab rhaub cartridge nrog lub zog ceev ntawm 5-6 W / cm² tuaj yeem nce qhov kub ntawm lub tshuab ziab khaub ncaws hauv lub tshuab nqus tsev kom qhuav rau cov khoom yas rau tus nqi predetermined (feem ntau 80-150 degree) thiab khaws cia rau ntawd, ua kom cov txheej txheem ziab kom zoo thiab cov khoom zoo.

Rau nruab nrab- daim ntawv thov kub lub tshuab nqus tsev kub (400-800℃), xws li nruab nrab- qhov kub ntawm lub tshuab nqus tsev vacuum, semiconductor wafer preheating khoom, thiab cov khoom siv nqus tsev vacuum, lub zog ntom ntom ntawm lub tshuab cua sov yuav tsum khaws cia ntawm 3 thiab 5 W / cm². Hauv qhov ntsuas kub no, cov khoom siv hluav taws xob (xws li hlau lossis semiconductor) muaj peev xwm xa cov cua sov yuav qis me ntsis, thiab cov cua sov poob hauv lub tshuab nqus tsev yuav nce mus. If the power density is excessively high (more than 5 W/cm²), the cartridge heater's surface temperature will be significantly greater than the temperature set for the heated object. Qhov no tuaj yeem ua rau lub plhaub rau oxidize, lub installation qhov ua rau distort, thiab txawm tias cov hlau tsis kam mus hlawv. Nyob rau hauv lub tshuab nqus tsev brazing ntawm hlau qhov chaw, piv txwv li, lub tshuab rhaub cartridge nrog lub zog ceev ntawm 3-4 W / cm² tuaj yeem ua kom qhov kub thiab txias tsis tu ncua thiab sib npaug, uas tiv thaiv cov khoom hlau los ntawm kub thiab tawg.

Rau siab -kub nqus cua sov daim ntawv thov (dhau 800 degree), zoo li siab -kub lub tshuab nqus tsev vacuum furnaces, tshiab khoom synthesis khoom, thiab semiconductor siab-kub annealing khoom, lub hwj chim ceev ntawm cartridge heaters yuav tsum muaj qis dua 3 W / cm². Cov ntaub qhwv lub thermal conductivity (txawm tias Inconel) yuav poob rau ntawm qhov kub thiab txias, thiab cov hluav taws xob hluav taws xob poob yuav nce ntau. If the power density is too high, the surface temperature of the cartridge heater will go above the melting point of the sheath material. Qhov no yuav ua rau lub sheath khoov, lub insulating muab tub lim kom yaj, ua rau luv luv circuits. Raws li kev paub hauv ntiaj teb no tiag tiag, lub tshuab cua sov cartridge nrog lub zog ntom ntom ntawm 2–3 W / cm² yog qhov zoo tshaj plaws rau siab - cov ntawv siv lub tshuab nqus tsev kub. Lawv tuaj yeem ua kom muaj cua sov qeeb thiab ruaj khov, tsis txhob muaj cua sov hauv zos, thiab ua kom lub tshuab cua sov kom ntev dua.

Ntau tus neeg tsim khoom yuam kev ntseeg tias kev nce lub zog ceev tuaj yeem ua kom cua sov ua haujlwm zoo dua. Nyob rau hauv lub tshuab nqus tsev cua sov ib puag ncig, hloov tshav kub feem ntau yog los ntawm conduction thiab hluav taws xob. Cov cua sov ua haujlwm tau zoo yog txiav txim siab ntau npaum li cas lub tshuab rhaub dej kub thiab cov khoom siv cua sov kov, cov khoom siv hluav taws xob zoo npaum li cas, thiab cov rwb thaiv tsev zoo li cas. If the power density is too high, the cartridge heater will not only not heat up as quickly, but it will also break down too soon. Tsis tas li ntawd, lub zog ceev ntawm lub tshuab rhaub cartridge yuav tsum phim qhov ntev thiab txoj kab uas hla ntawm lub rhaub. Rau luv luv thiab tuab cartridge heaters, lub hwj chim ceev yuav tsum tau tsa, tab sis rau ntev thiab nyias cartridge heaters, nws yuav tsum tau txo qis kom tsis txhob muaj cua sov tsis sib xws raws li ntev.

Lwm qhov tseem ceeb uas yuav tsum nco ntsoov yog tias lub tshuab cua sov lub tshuab hluav taws xob yuav tsum tau hloov pauv raws li qhov ua tau zoo ntawm lub tshuab nqus tsev. Piv txwv li, yog tias lub tshuab nqus tsev theem qis dua li qhov nws tau hais tseg (piv txwv li, qhov chaw nqus tsev tsis zoo), qhov kev hloov pauv ntawm cov cua sov yuav poob qis, thiab lub tshuab rhaub lub tshuab hluav taws xob yuav tsum tau txo qis kom tsis txhob muaj cua sov hauv ib qho chaw. Nyob rau hauv lub preheating theem, lub zog ceev yuav raug tsa kom ceev cov txheej txheem cua sov yog hais tias cov khoom raug rhuab muaj ib tug loj tshav kub peev xwm. Thaum qhov ntsuas kub tau mus txog, lub zog ceev tuaj yeem txo qis mus rau qhov qub.

Raws li cov ntsiab lus, lub zog ceev muaj qhov cuam tshuam loj npaum li cas cov tshuab cua sov ua haujlwm tau zoo thiab lawv nyob ntev npaum li cas hauv lub tshuab nqus tsev cua sov. Koj tuaj yeem ua kom paub tseeb tias lub tshuab rhaub dej kub ua haujlwm zoo, ua kom qhov kub thiab txias, thiab nyob ruaj khov los ntawm kev xaiv lub zog ceev ceev raws li qhov kev khiav hauj lwm kub, thermal conductivity ntawm cov khoom rhuab, thiab qib ntawm lub tshuab nqus tsev. Cov xwm txheej sib txawv ntawm lub tshuab nqus tsev cua sov hu rau qhov sib txawv ntawm lub zog sib txawv hauv lub tshuab rhaub cartridge. Cov kev daws teeb meem kev tshaj lij tuaj yeem pab cov tuam txhab tsim cov khoom siv hluav taws xob zoo tshaj plaws, zam cov teeb meem uas tshwm sim thaum lub zog tsis raug xaiv, thiab xyuas kom tag nrho lub tshuab nqus tsev cua sov ua haujlwm zoo.