Rwb thaiv tsev Integrity - Qhov tseem ceeb tshaj plaws nyob rau hauv Cryogenic Cartridge rhaub Reliability
Lub rwb thaiv tsev magnesium oxide nyob rau hauv lub tshuab cua sov cryogenic nyob rau hauv qhov ntim tsawg heev -tej zaum 20 cubic millimeters hauv 6mm txoj kab uas hla -tsis tau yuav tsum muaj lub zog dielectric hla 240V lossis 480V qhov sib txawv ntawm qhov kub ntawm -90℃rau +300℃. Qhov chaw huab cua no degrades txheem rwb thaiv tsev los ntawm ntau lub tshuab uas tshwj xeeb engineering yuav tsum tau hais.
Moisture absorption sawv cev rau thawj qhov kev hem thawj rau kev ruaj ntseg rwb thaiv tsev. Magnesium oxide yog hygroscopic; raug rau atmospheric noo noo thaum lub sij hawm tsim khoom los yog kev pab cuam degrades rwb thaiv tsev kuj dramatically. Nyob rau ntawm qhov kub thiab txias, absorbed noo noo freezes, tsim cov dej khov muaju uas muaj zog rwb thaiv tsev mechanically thiab muab txoj hauv kev thaum thawed. Cov cua sov txheem nrog cov ntsaws ruaj ruaj yooj yim tso cai rau maj mam ya raws uas ua rau qhov tsis ua tiav.
Hermetic sealing thev naus laus zis tiv thaiv kev nkag mus rau cov dej noo. Iav-rau- hlau foob siv hlau-nickel-cobalt alloys nrog kev sib tw thermal expansion tsim kom ruaj khov, nqus tsev vacuum-tight barriers. Lub foob yuav tsum tiv taus kub cycling los ntawm -90℃mus rau +300℃yam tsis muaj cracking, tswj hermeticity nyob rau hauv no ntau yam. Ceramic feedthroughs muab lwm txoj hauv kev rau cov ntawv thov kev ntseeg siab tshaj plaws, nrog kev tsim kho los yog welded kom ntseeg tau tias muaj kev ncaj ncees.
Cov ntaub ntawv ntsuas hluav taws xob qhia tau hais tias qhov ua tau zoo ntawm hermetic sealing. Hermetically kaw cov cua sov ua kom muaj kev tiv thaiv kev tiv thaiv siab tshaj 1000 megohms tom qab xyoo kev pabcuam, piv nrog 10 mus rau 100 megohms rau cov txheej txheem kaw cov cua sov hauv cov xwm txheej zoo sib xws. Qhov no 10- txog 100-fold kev txhim kho hauv dielectric kev ncaj ncees txhais ncaj qha rau kev txhim kho kev ntseeg tau thiab kev nyab xeeb.
Internal ya raws getters muab kev tiv thaiv ntxiv. Cov khoom siv desiccant nyob rau hauv lub rhaub dej nqus cov dej seem seem los ntawm kev tsim khoom lossis cov dej xau hauv lub sijhawm ua haujlwm. Cov getters no muaj peev xwm kawg tab sis ua kom muaj txiaj ntsig zoo tshaj qhov kev sib khi ib leeg ua tiav, ua rau lawv qhov tseem ceeb rau cov cua sov nrog 10+ xyoo tsim lub neej.
Thermal contraction cuam tshuam rau rwb thaiv tsev kev ncaj ncees. Magnesium oxide compacts kwv yees li 0.5 feem pua ntawm chav tsev kub mus rau -90 degree, tsim kev ntxhov siab sab hauv thiab muaj peev xwm tawg yog tias qhov ntom ntom tsis yog -ib puag ncig. High-density filling nrog optimized particle loj faib tswj kev ncaj ncees los ntawm qhov contraction. Cov txheej txheem tshwj xeeb compaction rau cov cua sov cryogenic ua tiav 98 feem pua lossis siab dua theoretical ntom ntom, piv nrog 90 txog 95 feem pua rau cov qauv qauv.
Kev ntsuam xyuas lub zog dielectric ntawm qhov kub thiab txias ua haujlwm tau zoo. Kev ntsuas tus qauv ntawm chav tsev kub tsis kwv yees tus cwj pwm cryogenic; rwb thaiv tsev uas zoo li txaus thaum sov yuav poob thaum txias. Kev sim ntau lawm rau cryogenic- ntsuas cua sov suav nrog ntsuas ntawm -40℃lossis qis dua, ua kom muaj peev xwm ua haujlwm tau tiag.
Kev ntsuam xyuas ib nrab tso tawm pom qhov cuam tshuam ntawm cov hluav taws xob rwb thaiv tsev. Cov voids me me los yog cov kab nrib pleb ua rau muaj kev ntxhov siab hauv cheeb tsam uas tsim cov teeb meem pom tau ua ntej ua tsis tiav. Qhov kev ntsuam xyuas rhiab heev no, siv rau cov qauv ntsuas cua sov lossis cov khoom siv ntau lawm, txheeb xyuas qhov kev tsim khoom sib txawv uas cov qauv ntsuas hluav taws xob tsis tuaj.
Cov txhuas hlau rwb thaiv tsev yuav tsum ua raws li cov kev cai cryogenic. Txheem silicone lossis PVC rwb thaiv tsev ua nkig thiab tawg ntawm -40℃. Mineral-insulated cables, PTFE nrog cov khoom tsim nyog, lossis tshwj xeeb cryogenic-rated polymers tswj tau yooj yim thiab dielectric zog mus rau -90℃thiab qis dua. Kev hloov pauv ntawm lub tshuab rhaub lub cev mus rau qhov hloov pauv tau yooj yim yog qhov tshwj xeeb thiab xav tau kev daws teeb meem.
Raws li kev ntseeg siab engineering cov ntaub ntawv, hluav taws xob rwb thaiv tsev tsis ua hauj lwm account rau 40 mus rau 50 feem pua ntawm cov teeb meem cryogenic heater teb, tshaj cov neeg kho tshuab lossis corrosion mechanisms. Qhov tseem ceeb tshaj plaws no ua rau rwb thaiv tsev engineering qhov kev qhuab qhia tseem ceeb rau kev tsim lub tshuab cua sov cryogenic, tsim nyog saib xyuas qhov tseem ceeb hauv kev qhia tshwj xeeb thiab kev ntsuam xyuas tus neeg muag khoom.
