Vim li cas Aluminium Ntawv Nyiaj Dominates Radiator Siv
Radiators thiab condensers yog tsim los ntawm nyias cov khoom txhuas vim tias cov hlau sib txuas cov thermal conductivity nrog tsawg ntom. Alloy 3003 ua cua sov ntawm kwv yees li 193 W / mK, kwv yees li ib nrab ntawm tooj liab los ntawm qhov ntim tab sis ntawm ib feem peb ntawm qhov ceev, ntawm 2.73 g ib cubic centimeter, yog li lub brazed aluminium core muab tib lub tshav kub tsis lees paub raws li tooj liab - tooj dag core ntawm qhov hnyav thiab tus nqi qis. Aluminium ntawv ci kuj qiv nws tus kheej mus rau lub louvred thiab lanced fin geometry uas rhuav tshem huab cua - sab ciam teb txheej, thiab nws yog sib xws nrog cov txheej txheem brazing siv rau siab - ntim ntau lawm.
Fin, Tube thiab Clad Alloys
| Muaj nuj nqi | Alloy | Cov yam ntxwv tseem ceeb |
|---|---|---|
| Fin thiab tube core | 3003 | Mn 1.0-1.5; nruab nrab lub zog, zoo formability, brazable |
| Brazing clad txheej | 4343 | Si 6.8–8.2; melts hauv qab lub hauv paus thiab tsim cov kev sib koom ua ke |
| Alternative clad txheej | 4045 | Si 9.0-11.0; qis melting point, siv rau nyias clad ratios |
| Sacrificial fin txheej | 7072-Type clad | Zn-cov kabmob txheej txheej, corrodes nyiam |
Manganese nyob rau hauv 3003 nce lub zog thiab tiv thaiv thermal qaug zog; cov silicon-nplua nuj clad txheej ntawm daim ntawv brazing yog tsim kom nws yaj ua ntej cov tub ntxhais thaum lub sij hawm brazing voj voog, ntub cov kev sib koom tes los ntawm capillary kev txiav txim thiab tsim ib tug fillet yam tsis muaj collapsing fin. Daim ntawv thiab ntawv ci qhov ntev thiab cov khoom siv kho tshuab rau cov tub ntxhais hlau alloy raug txiav txim rau ASTM B209 thiab, hauv kev lag luam metric, mus rau EN 573-3 thiab EN 485-2 rau kev muaj pes tsawg leeg thiab cov khoom raws.
Gauge xaiv thiab hloov tshav kub
Fin Tshuag feem ntau yog 0.08-0.12 hli tuab. Kev ntsuas qhov ntsuas txo qis cov thermal tiv thaiv los ntawm cov fins thiab txo cov nqi khoom, tab sis cov fins nyias tau yooj yim dua los ntawm kev co, los ntawm kev ntxuav dav hlau thiab los ntawm kev tuav thaum lub sij hawm sib dhos. Cov seem hnyav, los ntawm 0.15 hli mus rau 0.2 hli, yog xaiv rau cov raj, daim hlau thiab lub taub hau, thiab rau cov ntawv thov raug rau kev sib tw los yog kev vibration. The optimum thickness depends on fin density, coolant flow and air velocity, and is normally fixed by thermal simulation validated on a test core rather than by rule of thumb.
Brazing Routes
Ob txheej txheem yeej. Lub tshuab nqus tsev vacuum cia siab rau magnesium nyob rau hauv lub clad los yog ntawm magnesium-cov kabmob tseem ceeb nto los cuam tshuam cov oxide zaj duab xis, thiab xav tau lub tshuab nqus tsev tswj thiab ceev faj flux- pub dawb rauv taws. Kev tswj cov huab cua brazing siv tsis yog-corrosive potassium fluoroaluminate flux siv rau cov tub ntxhais sib dhos thiab cov cua nitrogen nrog cov dej lwg tswj tau; nws yog qhov ua tau ntev dua ntawm kev hloov pauv ntawm cov hlau alloy thiab yog txoj hauv kev ntau dua rau siab - ntim radiator ntau lawm. Ob txoj kev xav kom huv si, roj-dawb ntawv ci: residual dov lubricant thiab ntau oxide ob leeg ua hla thiab tsis yog- ntub dej raws tus fin- raj txuas.
Txheej rau Cua -Side thiab Coolant-Side Durability
Hydrophilic coatings yog siv rau lub fin nto kom cov dej condensed kis mus rau hauv ib zaj duab xis es tsis tsim cov tee dej uas txuas hniav fins thiab thaiv airflow. Los tiv thaiv- cov txheej txheem xeb, suav nrog chromate- cov khaubncaws sab nraud povtseg thiab silica lossis resin-raws li cov tshuab, tiv thaiv huab cua sab tiv thaiv txoj kev ntsev thiab sab cua txias tiv thaiv ib puag ncig me me alkaline glycol. Txheej adhesion thiab corrosion kev ua tau zoo raug soj ntsuam los ntawm cyclic humidity thiab ntsev- kev tshuaj ntsuam tshuaj tsuag, piv txwv li ASTM B117 thiab ISO 9227, kom cov tub ntxhais coated ua tau raws li qhov yuav tsum tau ua ntawm lub tsheb platform.
Rov ua dua
Brazed aluminium radiators yog tag nrho recyclable. Cov cores yog shredded rau cais steel thiab yas, thiab cov txhuas yog melted thiab refined rov qab mus rau foundry los yog wrought ingots; remelting aluminium yuav tsum tsuas yog ib feem me me ntawm lub zog xav tau los tsim cov hlau tseem ceeb los ntawm ore, nrog kev txuag feem ntau hais txog li 95 feem pua. Hauv kev xyaum, tus nqi rov ua dua yog nyob ntawm kev sau thiab kev ua haujlwm ntawm kev sib cais ntawm cov tooj liab, tooj dag thiab cov ntsiab lus yas ntawm lub tsheb dismantled.
Cov lus nug nquag
Q:Dab tsi alloy yog siv rau radiator fins?
A: Alloy 3003 yog tus qauv fin thiab tube core alloy, nrog manganese nyob rau hauv thaj tsam ntawm 1.0-1.5 feem pua rau lub zog thiab thermal qaug zog, thiab 4343 los yog 4045 raws li lub brazing clad txheej.
Q:Dab tsi fin thickness yog raug?
A: Feem ntau fin Tshuag yog 0.08-0.12 hli. Cov seem ntawm li 0.15-0.2 hli yog siv rau qhov xav tau kev nruj dua lossis kev vibration tsis kam, xws li cov raj, daim hlau thiab headers.
Q:Vim li cas hydrophilic coatings siv?
A: Lawv txwv tsis pub condensate los ntawm kev tsim cov tee dej uas txuas cov fins uas nyob ib sab thiab thaiv txoj kev cua, ua kom huab cua - sab hloov mus rau qhov kub thiab siab poob qis hauv kev ua haujlwm ntub.
Q:Dab tsi ua rau tsis yog - ntub dej thaum brazing?
A: Residual dov roj, ntau dhau ntawm txhuas oxide los yog qhov tsis raug clad piv. Cov ntawv ci rau brazing yog nkag huv thiab feem ntau yog degreased tam sim ntawd ua ntej cov tub ntxhais sib dhos.
Q:Puas tuaj yeem xaus - ntawm - lub neej hluav taws xob hluav taws xob tuaj yeem siv dua?
A: Yog. Shredded thiab cais radiator aluminium yog remelted rau hauv tshiab ingots, thiab remelting siv ib feem me me ntawm lub zog yuav tsum tau rau thawj aluminium ntau lawm.
Q:Yuav ua li cas tiv thaiv corrosion?
A: Los ntawm ntsev - tshuaj tsuag thiab cyclic corrosion tests xws li ASTM B117 thiab ISO 9227, ua ke nrog ntev -lub sij hawm electrochemical ntsuam xyuas ntawm lub fin thiab clad txheej ua ke siv nyob rau hauv cov tub ntxhais.