Thaum Cov Khoom Siv Txheej Txheem Tsis Ua Haujlwm - Kev Cai Sheath thiab Resistance Wire Xaiv rau Ib puag ncig hnyav
Nws tshwm sim ntau dua li ntau tus engineers xav lees. Lub tshuab hluav taws xob tshiab tau teeb tsa, txhua yam zoo li ua haujlwm raws li qhov xav tau, thiab tom qab ntawd peb lub hlis tom qab - ua tsis tiav. Lub sheath yog discolored. Corrosion chaw tau tshwm sim. Lub rhaub tau luv luv rau hauv av. Tus neeg ua txhaum? Kev xaiv khoom.
Lub tshuab cua sov lub tshuab hluav taws xob hlau tsis yog ib qho kev tiv thaiv xwb. Nws yog ib qho kev koom tes hauv cov txheej txheem cua sov, ua lub zog thermal los ntawm cov xaim hluav taws xob sab hauv mus rau qhov nruab nrab ib puag ncig. Yog hais tias cov ntaub ntawv sheath tsis yog rau ib puag ncig, tag nrho lub rhaub tsis ua haujlwm -Txawm hais tias cov khoom siv sab hauv tau tsim tau zoo npaum li cas.
Common Sheath Materials thiab lawv daim ntawv thov
Kev xaiv ntawm cov ntaub qhwv yog nyob ntawm ob yam: kev ua haujlwm kub thiab ib puag ncig chemistry.
304 Stainless hlau:Haum rau kev siv dav dav -cov phiaj xwm siv nrog qhov kub nruab nrab, cov khoom siv no muaj kev tiv thaiv oxidation hauv ntau qhov chaw. Nws ua haujlwm zoo hauv huab cua cua sov, pwm qhuav, thiab tsis yog -corrosive tej yam kev mob. Txawm li cas los xij, 304 stainless hlau tsis pom zoo rau cov ntawv thov uas muaj cov kua dej chlorinated lossis dej hiav txwv, vim tias pitting corrosion tuaj yeem tshwm sim.
316L Stainless hlau:Feem ntau siv rau kev siv dej cua sov. Qhov sib ntxiv ntawm molybdenum pab txhim kho cov tshuaj tiv thaiv chlorides thiab lwm yam corrosive agents, ua rau nws yog ib qho kev xaiv zoo rau cov dej kub, cov khoom siv ua zaub mov, thiab cov chaw hauv dej hiav txwv.
310S Stainless hlau:Tsim los rau siab - huab cua kub thov thiab ib puag ncig qhuav. 310S tuaj yeem tiv taus qhov kub thiab txias mus txog 1000℃thiab feem ntau tau teev tseg rau qhov cub, tshuab ziab khaub ncaws, thiab qhov cub uas lub rhaub dej tsis tso rau hauv cov kua.
Incoloy 800 (Nickel{1}}Iron-Chromium Alloy):Muab kev tiv thaiv zoo rau oxidation thiab carburization ntawm qhov kub thiab txias. Incoloy feem ntau tau teev tseg rau cov kua cua sov hauv cov ntawv thov xa tawm thiab rau ib puag ncig uas yuav tsum muaj qhov kub thiab txias thiab corrosion kuj.
Titanium:Cov khoom ntawm kev xaiv rau cov tshuaj lom neeg nruj heev uas muaj cov kua qaub lossis alkalis. Titanium sheaths muaj qhov tshwj xeeb corrosion kuj tab sis tuaj ntawm tus nqi siab dua. Rau cov ntawv thov xws li electroplating da dej los yog tshuaj ua cov tso tsheb hlau luam qhov twg stainless hlau yuav sai sai degrade, titanium feem ntau yog tib txoj kev xaiv.
Cov Hlau Resistance: Tsis yog Alloys Sib npaug
Nyob rau hauv txhua txhua lub tshuab rhaub dej kub, qhov tsim hluav taws xob tiag tiag tshwm sim hauv cov hlau tsis kam. Cov khoom siv ntau tshaj plaws yog npib tsib xee-chromium alloy (NiCr 80/20), muaj nuj nqis rau nws cov hluav taws xob ruaj khov thiab zoo oxidation tsis kam ntawm qhov kub siab. Rau siab dua -kev siv kub (txog 1100 degree), hlau-chromium- txhuas alloys (FeCrAl) tej zaum yuav raug teev, muab superior siab - kub lub zog tab sis nrog txawv thermal expansion yam ntxwv.
Kev paub qhia tau hais tias nyob rau hauv siab - ib puag ncig kev vibration- xws li cov tshuab ntim khoom nrog cov khoom txav nrawm lossis cov khoom siv raug rau cov neeg kho tshuab poob siab - hloov tau yooj yim dua cov hlau alloys tuaj yeem txo qhov kev pheej hmoo ntawm kev tawg. Lub kauj yuav tsum tsis yog tsuas yog tsim kom muaj cua sov tab sis kuj tseem muaj sia nyob txhiab tus thermal expansion thiab contraction cycles yam tsis muaj cracking los yog hloov.
Kev sib kis, noo noo, thiab tshuaj tua kab mob
Cov kab mob sab nraud tshwm sim los ntawm kev ya raws, roj, lossis roj tuaj yeem rub mus rau hauv lub tshuab rhaub dej kub, ua rau luv luv thiab ua rau lub rhaub dej tsis ua haujlwm. Qhov no yog qhov teeb meem tshwj xeeb hauv qhov chaw ua zaub mov uas nquag ntxuav tawm, lossis hauv cov khoom siv sab nraum zoov raug cov av noo thiab los nag.
Kev sealing zoo yog qhov tseem ceeb. Cartridge rhaub tuaj yeem nruab nrog epoxy potting lossis silicone potting, nyob ntawm qhov kub thiab txias. Rau siab- daim ntawv thov kub qhov twg cov organic epoxies yuav degrade, iav - mus rau - hlau los yog ceramic- mus rau - hlau brazed seals yuav tsum tau. Cov no yog tsim los ntawm cov khoom sib txuas ua ke nyob rau hauv ib puag ncig tswj qhov cub- txheej txheem qeeb, ceev faj uas ua kom muaj kev sib khi hermetic.
Hauv cov chaw ua tshuaj lom neeg uas muaj cov tshuaj corrosive tam sim no, cov ntaub ntawv xws li Hastelloy muaj kev tiv thaiv zoo rau tshuaj tua kab mob. Kev tu cov bores tsis tu ncua kom tshem tawm cov khib nyiab kuj tseem pab tiv thaiv cov kab mob sib kis uas tuaj yeem ua txhaum lub tshuab cua sov lub foob thaum lub sijhawm.
Lead Wire Configuration: Feem ntau -Overlooked Detail
Cartridge rhaub ua rau muaj kev puas tsuaj los ntawm qhov kub thiab txias ntau dhau. Thaum ntsia rau ntawm lub tshuab txav, qhov tseeb cov hlau lead hlau nrog rwb thaiv tsev thiab kev ntxhov siab txaus yog qhov tseem ceeb. Cov kev xaiv muaj xws li:
Standard fiberglass leads:Rau nruab nrab kub txog 200 degree.
Teflon (PTFE) leads:Rau cov tshuab ntim khoom thiab cov ntawv thov uas xav tau tshuaj tiv thaiv thiab yoog raws.
High-kub ntxhia-insulated (MI) cables:Rau qhov kub thiab txias lossis qhov chaw muaj kev phom sij.
Txoj cai - lub kaum sab xis coj thiab armored cables:Rau qhov chaw kaw ntom nti uas cov hlau lead ncaj yuav puas los yog ua tsis tau.
Cov txheej txheem xaiv cov khoom siv tswv yim
Txawv kev lag luam cua sov scenarios xav tau kev sib txawv ntawm cov khoom sib xyaw ua ke:
Yas txhaj molding nrog dej -cov pwm txias:304 stainless hlau sheath, txheem NiCr hlau, nruab nrab watt ceev. Kev raug dej yuav tsum muaj kev tiv thaiv corrosion, tab sis cov tshuaj aggressive feem ntau tsis tuaj.
Cov khoom siv ua zaub mov yuav tsum tau ntxuav txhua hnub:316L stainless hlau sheath nrog tag nrho potted seals. Kev ntxhua khaub ncaws qhia cov dej noo thiab cov tshuaj ntxuav tu-txheej txheem 304 stainless thaum kawg yuav pit thiab ua tsis tiav.
Kev ua tshuaj lom neeg nrog acid raug:Titanium los yog Hastelloy sheath. Tsis muaj kev cuam tshuam. Standard stainless hlau yuav degrade sai, paug ob lub rhaub thiab cov txheej txheem.
Siab -kev siv rauv kub (800℃+):310S stainless hlau los yog Incoloy sheath nrog cov ntxhia pob zeb-insulated leads. Organic seals tsis tuaj yeem ua tau ntawm qhov kub no; ceramic los yog iav seals yog yuav tsum tau.
Kab hauv qab
Kev xaiv cov ntaub ntawv tsis yog ib qho -size- haum- txhua qhov kev txiav txim siab. Nws yuav tsum tau sib piv cov sheath alloy, kuj hlau muaj pes tsawg leeg, sealing txoj kev, thiab txhuas configuration rau cov thermal thiab tshuaj ib puag ncig. Ib qho kev cai ib zaug - tas tubular rhaub tsim nrog cov ntaub ntawv raug yuav outlasting tus qauv rhaub los ntawm xyoo- them rau nws tus kheej ntau zaus dhau los ntawm kev txo qis thiab hloov cov nqi. Cov kev sib txawv corrosive xav tau cov tswv yim sib txawv, thiab nkag siab txog kev sib cuam tshuam ntawm qhov kub thiab txias, chemistry, thiab mechanical stress yog qhov tseem ceeb rau kev qhia txog lub rhaub uas ua tau tiag tiag.
