Thaum lub tshuab rhaub cartridge ua tsis tiav ntxov, qhov tsom xam feem ntau tig mus rau cov teeb meem hluav taws xob lossis qhov kub thiab txias. Txawm li cas los xij, ib qho tseem ceeb ntawm kev ua tsis tiav yog hauv paus hauv cov khoom siv tsis sib xws. Corrosion, oxidation, thiab galvanic cov tshuaj tiv thaiv tuaj yeem degrade lub rhaub ntev ua ntej nws cov khoom siv sab hauv hnav. To taub cov ntaub ntawv muaj pes tsawg leeg ntawm lub tshuab rhaub cartridge- lub plhaub, cov hlau tsis kam, rwb thaiv tsev, thiab cov ntsaws ruaj ruaj- yog qhov tseem ceeb rau kev xaiv cov khoom uas yuav ciaj sia thiab vam meej hauv nws qhov chaw npaj.
Cov hlau sheath yog kev tiv thaiv pem hauv ntej. Cov kev xaiv zoo ib yam ua rau hierarchy ntawm kev ua tau zoo thiab tus nqi. Stainless hlau 304 yog ib qho kev lag luam, dav dav - lub hom phiaj alloy nrog zoo oxidation tsis kam mus txog 700℃. Hom 321, ruaj khov nrog titanium, muaj kev tiv thaiv zoo dua rau intergranular corrosion. Rau ib puag ncig uas muaj chlorides, acids, lossis alkalis, Stainless Steel 316 (nrog molybdenum) yog qhov zoo tshaj plaws. Thaum kub tshaj 800℃los yog nyob rau hauv lub xub ntiag ntawm leej faj, npib tsib xee{11}}chromium alloys xws li Incoloy 800 los yog 840 yog tsim nyog rau lawv siab - kub lub zog thiab oxidation kuj. Rau cov tshuaj lom neeg nruj tshaj plaws, xws li cov halogens lossis cov kua qaub muaj zog, titanium lossis tantalum sheaths yuav yog qhov kev xaiv nkaus xwb, txawm tias ntawm tus nqi.
Nyob rau hauv lub sheath, cov kuj hlau coil, feem ntau yog ua los ntawm npib tsib xee -chromium (xws li, Nichrome) los yog hlau -chromium-aluminium alloys, generates cua sov. Hlau-chromium- aluminium alloys tuaj yeem ua haujlwm ntawm qhov kub siab dua tab sis yog nkig ntau dua; npib tsib xee-chromium alloys yog cov khoom siv ntau dua thiab tiv taus qee cov roj corrosive. Cov khoom siv rwb thaiv tsev sau qhov chaw nruab nrab ntawm lub kauj thiab lub plhaub yog yuav luag tsuas yog siab dua -purity magnesium oxide (MgO). Nws qib purity yog qhov tseem ceeb; impurities tuaj yeem ua rau txo dielectric zog thiab hluav taws xob tsis ua hauj lwm ntxov. MgO yuav tsum tau ntim kom nruj kom ntseeg tau zoo thermal conductivity thiab mechanical stability.
Lub sealing qauv nyob rau hauv lub davhlau ya nyob twg kawg, feem ntau siv high -kub epoxy, silicone, los yog ceramic-raws li cov tebchaw, tiv thaiv cov khoom sab hauv los ntawm ya raws thiab cov kab mob. Kev xaiv ntawm sealant yuav tsum sib haum nrog ob qho tib si kev khiav hauj lwm kub thiab tshuaj lom neeg ib puag ncig. Cov hlau lead / lub davhlau ya nyob twg tseem suav nrog cov khoom siv xaiv, nrog rau cov kev xaiv xws li cov qauv fiberglass- tes tsho xov hlau rau Teflon (PTFE) tsho ua rau cov tshuaj tiv thaiv lossis siab - kub braided hlau overbraids rau durability.
Los ntawm txoj kev pom zoo, xaiv cov khoom yuav tsum muaj kev txheeb xyuas ib puag ncig zoo. Yuav tsum muaj daim ntawv teev tag nrho cov tshuaj tam sim no, suav nrog cov tshuaj ntxuav thiab cov pa paug hauv huab cua, xav tau. Qhov siab tshaj plaws sheath kub, tsis yog tus txheej txheem kub, yuav tsum tau kwv yees. Kev saib xyuas tsis tu ncua yog ua tsis tau raws li qhov ua kom muaj kuab paug lossis "daws point", qhov twg corrosive vapors condense ntawm qhov chaw txias ntawm lub rhaub. Lwm qhov teeb meem tshwm sim yog galvanic corrosion, uas tshwm sim thaum cov hlau tsis sib xws (xws li lub tshuab hluav taws xob stainless hlau hauv ib qho txhuas thaiv) nyob rau hauv kev sib cuag nrog cov electrolyte (xws li ya raws). Siv lub tes tsho insulating los yog xaiv cov ntaub ntawv sib xws tuaj yeem tiv thaiv qhov no.
Nws tseem yog ib qho tseem ceeb los xav txog tag nrho cov thermal voj voog. Qee cov ntaub ntawv muaj cov coefficient sib txawv ntawm thermal expansion. Yog tias cov ntaub qhwv thiab cov hlau nyob ib puag ncig nthuav dav ntawm tus nqi sib txawv, nws tuaj yeem tsim kev ntxhov siab lossis hloov qhov haum rau ntau lub voj voog. Rau siab -kub caij tsheb kauj vab, cov khoom siv nrog kev sib tw nthuav dav coefficients lossis cov qauv tsim uas haum rau kev txav mus los tau zoo.
Nyob rau hauv xaus, cov ntaub ntawv siv nyob rau hauv lub cartridge rhaub yog tsis arbitrary; lawv yog ib tug ua tib zoo xaiv system tsim los ua hauj lwm nyob rau hauv kev sib haum xeeb nyob rau hauv tej yam kev mob. Xaiv cov khoom siv sheath kom raug, tiv thaiv hlau, rwb thaiv tsev, thiab cov ntsaws ruaj ruaj rau thermal, tshuaj, thiab txhua yam ib puag ncig yog qhov zoo tshaj plaws los xyuas kom meej lub neej ntev kev pab cuam thiab txhim khu kev qha. Piv txwv tias cov khoom siv tus qauv yuav txaus rau hauv qhov tsis yog- ib puag ncig tus qauv yog qhov ua yuam kev thiab raug nqi ntau.
Txhua txheej txheem kev lag luam muaj qhov tshwj xeeb ib puag ncig kos npe. Cov khoom siv zoo sib xyaw ua ke rau qhov qhuav, siab - qhov cub kub txawv ntawm cov khoom ntub dej, corrosive cov khoom noj los yog lub siab - vibration ntim tshuab. Yog li ntawd, kev ua tiav qhov siab tshaj plaws cua sov lub neej ntev thiab kev ntseeg siab feem ntau cuam tshuam nrog kev txav mus dhau qhov kev muab khoom. Muab cov ncauj lus kom ntxaws daim ntawv thov rau cov chaw tsim khoom tshwj xeeb ua rau kev tsim vaj tsev ntawm kev daws teeb meem uas txhua yam khoom raug xaiv los ua kom tau raws li cov teeb meem tshwj xeeb ntawm daim ntawv thov, kom ntseeg tau tias lub rhaub yog ib qho tseem ceeb thiab ruaj khov ntawm lub cev.
