Tsis yog, lub tshuab cua sov PFA nrog lub plhaub tawg tsis tuaj yeem kho tau zoo los ntawm tshav kub-shrinking ib lub raj PFA tshiab hla thaj chaw puas lawm. Kev kho tsis ua tiav rau peb qhov laj thawj: (1) qhov tawg tso cai rau cov dej noo thiab cov kab mob kom nyob twj ywm ntawm cov txheej qub thiab cov txheej txheem tshiab, ua rau muaj kev xeb ntxiv; (2) cov cua sov-cov txheej txheem ntsws (200-250 degree) txaus ntshai melting lub qub PFA los yog ua rau cov hlau hauv cov tub ntxhais thiab cov xaim; (3) lub raj tshiab tsis muaj tshuaj lom neeg rau lub plhaub qub, tawm hauv qhov sib txawv me me uas yuav ua kua dej. Hauv kev kuaj sim, kev kho thaj chaw no tsuas yog siv sijhawm li 1-3 lub hlis ua ntej rov- tawg lossis ua txhaum hauv av. Tsuas yog kev kho kom zoo thiab txhim khu kev qha yog hloov tag nrho lub rhaub. Rau kev siv xwm txheej ceev ib ntus, lub tes tsho PTFE tawg nrog hose clamps tuaj yeem tso tseg rau hnub, tab sis tsis tuaj yeem kho mus tas li.
Yog vim li cas Thaum tshav kub kub-Shrink Repair Fail
| Hom kev ua tsis tiav | Mechanism | Lub Sijhawm Ua Tsis Taus |
|---|---|---|
| Ncua noo noo | Cov dej hauv qhov tawg ua rau lub qhov cub tawg ntawm thawj qhov cua sov- nce | Teev mus rau hnub |
| Interfacial qhov sib txawv | Cov raj tshiab tsis khi; kua wicks ntawm txheej | Hnub rau lub lim tiam |
| Kev puas tsuaj cua sov | Thaum tshav kub kub-shrink temp degrades qub PFA, melts los yog deforms | Tam sim ntawd lossis thawj lub voj voog |
| Kev nthuav tawm tawg | Qub tawg tseem loj hlob nyob rau hauv lub raj tshiab (tsis pom) | Lub lis piam mus rau hli |
| Core corrosion | Kev tawg twb tso cai rau cov kua qaub mus txog qhov tseem ceeb; tube tshiab tsis thim rov qab corrosion | Lub hli (core tsis ua hauj lwm) |
Kev Kho Kom Zoo Zoo (Tsis Pom Zoo, Tab sis Cov Ntaub Ntawv)
Yog tias kev kho yog sim ua qhov chaw kawg (tsis muaj khoom seem, txheej txheem tseem ceeb), ua raws li cov txheej txheem no - tab sis nkag siab tias lub rhaub yuav zoo dua tsis ntev.
Qhuav lub rhaubntawm 80℃rau 24 teev kom tshem tawm noo noo los ntawm tawg.
Ntxuav thaj chaw tawgnrog isopropanol, ces roughen nrog nplua sandpaper (400 grit) los txhim kho adhesion.
Siv high -kub silicone sealant(RTV, 300℃ntsuas) rau hauv qhov tawg.
Xaub lub tshav kub- ntsws PFA raj(oversized, 1.5 × lub taub rhaub dej) tshaj qhov puas lawm, ncua 50 hli dhau los ntawm qhov tawg txhua sab.
Thaum tshav kub kub sib npaug nrog rab phom cua kub(250 degree) kom txog rau thaum lub raj shrinks nruj nreem. Tsis txhob overheat (max 280 degree).
Txias maj mam(cua txias, tsis quench).
Kuaj rwb thaiv tsev tsis kam (must be >100 MΩ ntawm 500 V DC). Yog<10 MΩ, repair failed.
Kev sib piv kev ua tau zoo: Cov Cuab Yeej Tshiab vs. Kho Rhaub
| Qhov xwm txheej | Thawj IR (MΩ) | IR tom qab 1 lub hlis (80℃dej) | IR tom qab 6 lub hlis | Failure Rate | Kev pom zoo |
|---|---|---|---|---|---|
| Lub tshuab cua sov tshiab | >1,000 | >1,000 | >1,000 | <1% per year | Siv |
| Shrink tube kho (Cracked sheath) | 100–500 | 10–100 | <1 (failed) | 80% ntawm 6 lub hlis | Kev kub ntxhov nkaus xwb |
| Silicone + shrink tube | 50–200 | 5–50 | <1 (failed) | 90% ntawm 6 lub hlis | Tsis pom zoo |
| PTFE lub tes tsho + clamps (ntev) | 10–100 | 1-10 (txog) | N/A | 100% ntawm 2 lub hlis | Nres -gap (hnub) |
Piv txwv teb
Ib tsob nroj muaj lub tshuab cua sov PFA nrog 2 cm ntev tawg (kua kua). Tsis muaj khoom seem; kev hloov pauv yuav siv sijhawm 3 hnub. Lawv tau sim ua kom lub ntsws- kho lub raj (tom qab ziab thiab silicone). Lub tshuab cua sov ua haujlwm rau 3 lub lis piam, tom qab ntawd hauv av- ua txhaum poob. Kev faib tawm qhia tau hais tias qhov tawg tau nthuav tawm hauv qab lub ntsws, thiab cov dej noo tau corroded lub hauv paus. Cov nroj tsuag xaus lus tias kev kho yuav lub sijhawm tab sis tsis yog kev daws teeb meem tas mus li. Tam sim no lawv khaws cov khoom seem ntawm tes.
Thaum Kho Kho Kom Zoo?
| Qhov xwm txheej | Kho Kev sim? | Sau ntawv |
|---|---|---|
| Lub rhaub yog tib qho, txheej txheem tsis tuaj yeem nres rau 24 teev | Yog (emergency) | Txiav txim hloov tam sim ntawd; cia siab tias yuav kho tsis tau |
| Lub rhaub muaj qhov tsis tshua muaj hluav taws xob (120V), tsis tshua muaj siab (<1 bar), non-critical fluid | Tej zaum | Muaj peev xwm kav lub hlis hauv kev pabcuam me me |
| Rhaub hauv semiconductor lossis kev pabcuam kws tshuaj | Tsis muaj | Kev pheej hmoo ntawm kev kis kab mob siab dhau |
| Crack yog nyob rau hauv txias kawg (tsis submerged) | Muaj peev xwm (qis dua) | Txias kawg pom kev nyuaj siab; kho yuav kav ntev dua |
| Any crack >10 mm los yog ntau qhov tawg | Tsis muaj | Tsis tuaj yeem kaw kev ntseeg siab |
| Pom core corrosion (ntsuab / dawb deposits) | Tsis muaj | Lub tshuab rhaub twb ua tsis tiav |
Safe Alternatives to Field Repair
Hloov lub rhaub(zoo tshaj). Khaws cov khoom seem hauv Tshuag.
Siv lub tshuab hluav taws xob thaub qab(ib ntus) thaum hloov tuaj txog.
Nruab ib thaj(PTFE daim ntawv + hose clamps) ua ib ntus foob rau ob peb hnub - tsis yog kho, tsuas yog tso tseg.
Xa mus rau lub Hoobkas rau re- sheathing(kev kho kev tshaj lij, tshem tawm PFA qub thiab rov-extruding). Qhov no yog ua tau tab sis kim (50-70% ntawm tus nqi tshiab rhaub). Tsuas yog rau loj, kev cai tso cua sov.
Xaus: Tsis txhob sim kho teb ntawm PFA Sheath tawg
Lub tshuab cua sov PFA nrog lub plhaub tawg tsis tuaj yeem kho tau zoo los ntawm tshav kub-shrinking ib lub raj tshiab los ntawm kev puas tsuaj hauv thaj teb. Kev kho tsis ua tiav vim muaj cov dej ntws tsis zoo, kev sib txuas tsis zoo, thiab txuas ntxiv tawg tawm. Hauv kev sim, kev kho zoo li no tau siv sijhawm ntau lub lis piam mus rau lub hlis, tsis yog xyoo. Rau kev siv thaum muaj xwm txheej ceev, lub tes tsho PTFE nrog cov clamps tuaj yeem tso tseg rau hnub, tab sis kev kho kom ruaj khov yuav tsum muaj lub Hoobkas rov- sheathing lossis hloov lub rhaub. Rau cov ntawv thov tseem ceeb, khaws cov cua sov seem. Rau qhov tsis yog - tseem ceeb, hloov lub rhaub. Tsis txhob tso siab rau qhov shrink -tube thaj. Kev tawg yog ib txoj hauv kev rau kev ua tsis tiav. Npog nws tsis kho nws. Hloov, tsis kho. Koj cov txheej txheem thiab kev nyab xeeb nyob ntawm nws. Ib 500heaterischeapcomparedtoa500heaterischeapcomparedtoa50,000 batch contamination lossis hluav taws. Tsis txhob pheej hmoo. Hloov.
