Cov kws tshaj lij hluav taws xob qhia cov khoom siv hluav taws xob rau cov ntawv thov uas muaj qhov kub thiab txias ntau zaus ntsib cov hlau lead tsis ua haujlwm uas cuam tshuam lwm yam kev ntseeg tau cov cua sov. Kev hloov pauv los ntawm thaj chaw cua sov mus rau ambient kev sib txuas ua rau muaj kev thermal gradients thiab mechanical stresses uas cov qauv hlau tsis tuaj yeem muaj sia nyob. Raws li kev soj ntsuam tsis ua hauj lwm hla kev kho cua sov hlau, kev sim aerospace, thiab cov khoom siv tshuaj lom neeg, square- lub taub hau cartridge rhaub teeb tsa ua kom muaj cov tswv yim qhia cov hlau lead uas daws cov teeb meem kev hloov pauv no los ntawm kev tsim kho strain nyem thiab xaiv cov khoom siv.
Standard cartridge heaters nrog yooj yim xaim tawm kev flexural qaug zog qhov twg cov hlau lead tawm los ntawm nruj txiav mus rau hauv unconstrained qhov chaw. Thermal expansion sib txawv ntawm cov rhuab sheath thiab ambient hlau hlau tsim khoov lub sij hawm concentrated ntawm qhov chaw tawm. Rov ua dua thermal cycling pib tawg nyob rau hauv conductor strands uas mus ua kom tiav qhib circuits. Square- kev teeb tsa lub taub hau muab cov cuab yeej siv kho tshuab rau cov cuab yeej siv kho mob uas faib kho khoov raws li qhov ntev tswj tau, txo qis kev ntxhov siab siab tshaj qhov pib qaug zog thiab txuas ntxiv flex lub neej los ntawm kev txiav txim siab.
Siab -cov ntaub ntawv kub ntawm cov hlau lead tam sim no ua lag luam- tawm ntawm thermal muaj peev xwm thiab cov neeg kho tshuab hloov pauv uas ua rau nyuaj rau kev qhia tshwj xeeb. Nickel-plated tooj liab conductors muaj hluav taws xob zoo heev thiab nruab nrab kub tsis kam, tab sis ua nkig thaum annealed los ntawm kev raug cuam tshuam ze 300 degrees Celsius. Ntshiab npib tsib xee conductors tuav txhua yam kev ncaj ncees rau 450 degrees thiab tshaj, tab sis nrog plaub caug feem pua siab dua resistivity uas txo qhov voltage poob margins. Lub xwmfab- lub taub hau davhlau ya nyob twg ib puag ncig, feem ntau yog txias dua li qhov sib cais vim qhov sib cais ntawm cov cua sov, tuaj yeem siv cov tooj liab conductors qhov twg cov cua sov cylindrical nrog cov terminals tag nrho yuav tsum tau nickel.
Kev xaiv cov khoom siv rwb thaiv tsev rau cov hlau lead yuav tsum hais txog qhov kub thiab txias thiab ib puag ncig raug. Standard silicone roj hmab tebchaw muab kev yooj yim thiab noo noo tsis kam mus rau 200 degrees, txaus rau ntau square- lub taub hau daim ntaub ntawv nyob rau hauv lub davhlau ya nyob twg kub nyob rau hauv nruab nrab. Rau qhov xav tau kub dua lossis raug tshuaj lom neeg, fiberglass braid nrog siab -kub lacquer impregnation txuas ntxiv peev xwm mus rau 450 degrees nrog txo qhov yooj yim. Ceramic hlaws rwb thaiv tsev ua tiav qhov kawg ntawm qhov kub thiab txias txawm tias nrog kev nruj uas yuav tsum tau ua tib zoo strain nyem tsim los tiv thaiv tus neeg xyuas pib qaug zog los ntawm kev co lossis tuav.
Kev tiv thaiv ib puag ncig tshaj qhov kub muaj xws li tiv thaiv cov roj, cov kuab tshuaj, thiab atmospheric noo noo uas degrade rwb thaiv tsev. Polytetrafluoroethylene (PTFE) rwb thaiv tsev muab cov tshuaj tiv thaiv zoo heev thiab muaj peev xwm kub kub txog 260 degrees, haum rau ntau qhov chaw ua haujlwm. Fluorinated ethylene propylene (FEP) muaj cov tshuaj tiv thaiv zoo sib xws nrog kev txhim kho yooj yim rau cov ntawv thov kom nruj khoov radii. Lub xwmfab- lub taub hau teeb tsa ua rau lub kaw lus kaw lub davhlau ya nyob twg uas tiv thaiv kev hloov pauv ntawm cov hlau lead los ntawm cov tshuaj txau ncaj qha los yog vapor raug, nthuav tawm qhov ua tau zoo ntawm cov khoom siv rwb thaiv tsev.
Lub tshuab hluav taws xob lim dej rau square- lub taub hau tso cua sov ua kom haum rau ntau yam kev teeb tsa geometries thaum tswj kev tiv thaiv zoo. Compression glands nrog elastomeric inserts, koom nrog lub taub hau tiaj tus, foob tiv thaiv ya raws thaum tso cai tswj flexure ntawm kev tawm mus. Caij nplooj ntoos hlav- loaded khoov txwv, clamped rau lub taub hau geometry, txwv khoov vojvoog rau qhov tseem ceeb tshaj tus neeg xyuas pib qaug zog. Cov cuab yeej no yuav tsum tau teev tseg rau qhov tshwj xeeb xaim kab thiab cov khoom siv, nrog rau qhov loj me me tsis ua kom muaj kev txwv txaus thiab tsis muaj qhov cuam tshuam rau kev sib tsoo tawg.
Cov khoom siv hluav taws xob tua hluav taws xob ntawm lub taub hau square yuav tsum raug xaiv rau kev sib raug zoo nrog cov khoom siv hlau lead thiab yuav tsum tau tu ntau zaus. Ntsia hlau terminals nrog npib tsib xee-plated tooj dag lub cev haum rau ob qho tib si tooj liab thiab npib tsib xee conductors yam tsis muaj galvanic corrosion txaus ntshai. Lub caij nplooj ntoos hlav tawb terminals muab kev sib cuag nrog lub siab los ntawm thermal cycling yam tsis muaj retorquing yuav tsum tau, txawm tias muaj peev xwm tam sim no tsawg piv nrog cov ntsia hlau hom. Lub tiaj mounting nto ntawm lub taub hau square ua rau cov ntau yam davhlau ya nyob twg nrog kev ruaj ntseg txhua yam txuas tsis yooj yim rau ntawm cylindrical configurations.
Kev txhim kho cov kev coj ua rau kev tswj cov hlau lead muaj feem cuam tshuam rau kev ntseeg tau ntawm thaj chaw. Routing yuav tsum zam cov npoo ntse lossis pinch cov ntsiab lus uas tuaj yeem ua rau cov rwb thaiv tsev puas thaum sib dhos lossis thermal txav. Kev pabcuam loops, muab qhov ntev ntev kom haum rau kev hloov lub tshuab cua sov yam tsis muaj kev cuam tshuam cov chaw txuas mus tas li, yuav tsum tau muab tso rau qhov chaw uas lawv yuav tsis tiv tauj cov chaw kub lossis cov tshuab txav. Qhov kev taw qhia ruaj khov ntawm square- lub taub hau tso cua sov ua kom muaj kev sib txuas ua ke uas tau tswj xyuas los ntawm ntau lub voj voog hloov, txo qhov kev hloov pauv uas ua rau muaj teeb meem kev teeb tsa.
Kev soj ntsuam cov txheej txheem rau cov hlau lead hlau sib txuas ua kom pom tseeb ntawm hluav taws xob kev ncaj ncees thiab kev siv tshuab ua haujlwm ntev. Continuity verification paub meej tias tsim nyog crimp lossis solder sib koom ua ke kev ncaj ncees ntawm kev hloov pauv hauv lub davhlau ya nyob twg. Rwb thaiv tsev tiv thaiv kev ntsuas ntawm qhov kub siab qhia cov ntaub ntawv uas tuaj yeem dhau chav - ntsuas kub tab sis degrade thaum cua sov. Flex kev ntsuam xyuas ntawm cov teeb meem kev ntxhov siab, simulating xyoo ntawm thermal cycling nyob rau hauv cov txheej txheem ceev, validates mechanical design ua ntej kev xa tawm. Cov txheej txheem no, ua los ntawm cov qauv tsim thiab tom qab kev hloov pauv tsim, xyuas kom meej tias cov hlau lead ua tau raws li lub hom phiaj kev ntseeg tau.
Kev qhia tshwj xeeb ntawm cov hlau lead hlau rau square- lub taub hau lub taub hau lub tshuab cua sov xav tau kev tshuaj xyuas ntawm qhov ua tiav thermal thiab mechanical ib puag ncig es tsis yog xaiv raws li qhov ntsuas kub. Daim ntawv thov kev tshaj lij kev lag luam ntsuas qhov ntsuas kub ntawm thaj chaw rhuab los ntawm lub davhlau ya nyob twg mus rau ambient kev sib txuas, txheeb xyuas cov tshuaj lom neeg thiab cov khoom siv hluav taws xob, thiab qhia txog kev sib koom ua ke ntawm tus neeg xyuas pib, rwb thaiv tsev, lim nyem, thiab txiav tawm uas ua kom ntseeg tau tias kev ua tau zoo. Txoj hauv kev zoo no tiv thaiv cov hlau lead tsis ua haujlwm uas cuam tshuam cov cua sov muaj nyob rau hauv kev xav tau kev lag luam.
