Kev xaiv cov khoom siv rau -80℃Cartridge rhaub-Qhov ua haujlwm tiag tiag
Thaum lub tshuab rhaub dej kub tsis ua haujlwm ntawm -80 degree, qhov ua rau tsis tshua pom tseeb los ntawm sab nraud. Lub sheath yuav zoo li qub. Cov xaim yuav tshwm sim suab. Tsis tau sab hauv, cov khoom siv uas ua rau lub rhaub ua haujlwm ntawm chav tsev kub tau hloov tag nrho.
Qhov teeb meem tseem ceeb yog thermal contraction. Los ntawm chav tsev kub mus rau qhov kub thiab txias, stainless hlau cog lus li ntawm 0.3%, thaum Inconel alloys cog lus li ntawm 0.2%. Qhov sib txawv ntawm kev sib cog lus ntawm cov ntaub qhwv, rwb thaiv tsev, thiab cov xaim tiv thaiv ua rau muaj kev ntxhov siab sab hauv uas cov qauv tsim tsis tuaj yeem ua. Cov txiaj ntsig yog micro- tawg ntawm cov rwb thaiv tsev, qhov khoob ntawm qhov cuam tshuam, thiab thaum kawg, hluav taws xob tsis ua haujlwm.
Sheath xaiv cov khoom nthuav qhia qhov kev txiav txim siab tseem ceeb. Stainless hlau 304 ua haujlwm txaus rau kev lag luam cua sov, tab sis nws dhau los ua nkig ntawm qhov kub thiab txias, ua rau nws muaj kev cuam tshuam ntau dua los ntawm kev poob siab los ntawm thermal shock lossis mechanical stress. Austenitic qib 321 thiab 316 muab kev ua kom zoo dua qub vim tias lawv cov microstructure tseem ruaj khov. Rau cov ntawv thov uas xav tau tshaj plaws, Inconel 600 lossis tshwj xeeb npib tsib xee -chromium alloys ua kom pom kev ua haujlwm zoo rau thermal shock thaum caij tsheb kauj vab ntawm -80℃thiab ua haujlwm kub txog li ob peb puas degrees saum xoom. Cov alloys no tswj txhua yam kev ncaj ncees thoob plaws tag nrho cov kub spectrum.
Lub magnesium oxide rwb thaiv tsev tau ntim rau hauv cov pa ua haujlwm tau hloov pauv hloov pauv hloov pauv ntawm qhov kub thiab txias. High -cov txheej txheem compaction ceev, ua tiav qhov ceev tshaj 3.2 grams ib cubic centimeter, dhau los ua qhov tseem ceeb rau kev tswj cov txheej txheem kev ncaj ncees. Cov tuam txhab hwm siv cov kev tsim kho swaged uas compress magnesium oxide hmoov rau nws qhov siab tshaj plaws, tshem tawm cov voids qhov twg condensation tuaj yeem sau. Qhov no ua kom cov cua sov hloov tau zoo txawm tias qhov kub sab nraud sim rub nws los.
Cov hlau tsis kam nws tus kheej-feem ntau yog npib tsib xee-chromium alloy zoo li NiCr 80/20- yuav tsum qhia cov khoom hluav taws xob ruaj khov tshaj qhov ntsuas kub tag nrho. Ntawm -80 degree, npib tsib xee-chromium alloys yuav muaj 10-15% tsis kam tsawg dua li ntawm qhov kub thiab txias. Lub rhaub uas rub 10A ntawm 20℃tuaj yeem kos 11-12A thaum thawj zaug pib hauv cov xwm txheej cryogenic. Tus cwj pwm txias-pib no yuav tsum tau suav nrog hauv cov khoom siv hluav taws xob thiab kev tswj hwm kev tsim qauv.
Lub coefficient ntawm thermal expansion yog ib qho tseem ceeb tsim kev xav. Kev tsis sib haum xeeb ntawm lub tshuab cua sov thiab cov hlau nyob ib puag ncig tsim kom muaj zog sib tsoo thaum lub caij txias. Internal Cheebtsam siv alloys txuam nrog thermal expansion coefficients los tiv thaiv sab hauv tawg thaum kub hloov. Cov khoom siv tshwj xeeb no nce nqi ntau lawm, tab sis lawv txo qhov zaus hloov.
Kev txiav hluav taws xob xav tau kev saib xyuas tshwj xeeb hauv cov chaw ua haujlwm cryogenic. Txheem crimp kev sib txuas sib cog lus ntawm tus nqi sib txawv dua li cov khoom siv hluav taws xob, tsim kom muaj siab -cov kab sib txuas uas ua kom muaj cua sov hauv zos. Nyiaj - soldered los yog brazed kev sib txuas, kaw nrog epoxy compounds ntsuas rau thermal shock resistance, tuav conductivity kev ncaj ncees nyob rau hauv lub kub spectrum. Cov thawv ntim khoom txheem thiab epoxy seals tawg nyob rau hauv thawj ob peb lub voj voog kub, xau ya raws, thiab tsim hluav taws xob txaus ntshai. Cov kev daws teeb meem raug sim rau cov kev pabcuam cryogenic- tshwj xeeb compression seals, hermetic feedthroughs, thiab cryogenic- ntsuas kev sib txuas kho vajtse- daws cov teeb meem no.
Kev xaiv cov khoom siv rau lub tshuab rhaub dej kub rau -80℃kev pabcuam tsis yog hais txog kev xaiv cov kev xaiv kim tshaj plaws. Nws yog hais txog kev sib piv cov khoom siv rau qhov tshwj xeeb thermal xav tau ntawm daim ntawv thov. Ib lub taub hau hluav taws xob cua sov tube cartridge rhaub rau chav kuaj lub tshuab ziab khaub ncaws muaj qhov xav tau sib txawv dua li ib qho rau cov chaw muag tshuaj txias txias, thiab qhov sib txawv dua ntawm cov cuab yeej kuaj aerospace. Kev nkag siab txog cov kev sib txawv no yog qhov tseem ceeb rau kev qhia txog lub tshuab cua sov uas yuav ua tau kev ntseeg siab ntawm nws lub neej kev pab cuam.
