Lub ntsiab fuse ua tiav qhov tseeb fusing raws li qhovJoule thermal nyhuv thiab metallurgical nyhuv, kev sib koom tes nrog peb tus qauv tsim logics: arc extinction ntawm roj tiam hauv lub fuse raj thiab txhua yam kev sib nqus nqus. Nws ua tau raws li plaub qhov yuav tsum tau ua: ntsuas lub peev xwm nqa tam sim no, ncua sij hawm fusing nyob rau hauv overload, instantaneous luv luv -circuit breaking thiab mechanical latching los ntawm tensile quab yuam.
1. Kev tsim qauv ntawm cov khoom siv (Core: Metallurgical Effect)
Cov ntsiab lus fuse feem ntau yog ua los ntawmtinned tooj liab hlau los yog nyiaj - tooj liab composite alloy. Qhov qis- melting-point tin forms eutectic alloy nrog tooj liab kom paub cov qib fusing:
Tinned tooj liab fuse caij (hom dav)
Copper substrate muaj qhov melting point ntawm 1083℃nrog txheej tin plating (melting point: 232 degree). Thaum overloaded, tin melts ua ntej thiab permeates rau hauv tooj liab kom tsawg - melting tooj liab- tin alloy (415 degree), uas fuses maj mam nyob rau hauv me ntsis overload deb ntawm lub melting point ntawm ntshiab tooj liab. Nyob rau hauv luv luv -circuit tam sim no, tag nrho cov khoom overheats thiab so tam sim ntawd.Nyiaj- tooj liab alloy fuse caij (ceev- hom tawg)
Nyiaj - tooj liab eutectic alloy melts ntawm 778℃nrog nqaim melting ntau thiab ruaj khov oxidation kuj. Nws tus ntoo khaub lig- ntu tseem tsis hloov pauv thaum lub sijhawm ntev - kev pabcuam thiab tuaj yeem ua tiav millisecond - theem tawg rau transformer luv - tiv thaiv Circuit Court.
Lub hom phiaj tsim: Tsis muaj kev sib xyaw ua ke raws li qhov ntsuas tam sim no; ncua sijhawm fusing ntawm 1.3 lub sij hawm ntsuas ntau dhau; instantaneous breaking nyob rau hauv luv luv - Circuit Court txhaum, txuam lub ampere - thib ob tiv thaiv tus yam ntxwv nkhaus.
2. Tus Qauv Tsim Qauv (Nqaim-caj tam tam sim no- txwv Fusing)
Variable cross-section nqaim-neck structure
Precision txo- txoj kab uas hla (cov caj dab nqaim) yog machined ntawm lub cev fuse. Cov ntu nqaim no muaj kev ua haujlwm siab dua thiab ua kom kub siab rau yaj nyiam dua thaum overcurrent, paub tias ruaj khov - taw tes fusing thiab txwv fusing kam rau ua nyob rau hauv ± 5%.Multi-strand composite qauv
Loj - cov kev qhia tshwj xeeb tam sim no tau txais cov hlua zoo sib xws rau cov cua sov kom zoo thiab qhov kub tsis tshua muaj siab nyob rau hauv cov khoom ntsuas. Strands tawg sequentially thaum faults kom sib npaug txhua yam tensile zog thiab fusing rhiab heev; lub caij no, qhov ua ntej - nro ntawm fuse xaim xauv qhov kev sib cuag ntawm lub fuse raj.
3. Mechanical Tension Design Principple (Txuas Txuas Txuag -tawm Mechanism)
Sib nrug los ntawm kev ua tam sim no thiab fuse, lub fuse caij tseem ua haujlwm raws li cov khoom siv hluav taws xob. Khiav los ntawm tag nrho cov fuse raj, lub fuse yog tsau rau sab sauv thiab qis txav kev sib cuag ntawm ob qho kawg. Tom qab kaw kev ua haujlwm, lub zog tensile clamps lub sab sauv txav mus rau hauv lub duckbill- zoo li zoo li qub kev sib cuag buckle thiab compresses caij nplooj ntoos hlav tiv tauj kom tswj tau lub voj voog. Thaum lub fuse tshuab, ua ntej- nro ploj tam sim ntawd, lub caij nplooj ntoos hlav duckbill tso tawm qhov kev sib cuag, thiab lub raj fuse tig thiab poob los ntawm nws tus kheej - hnyav nrog rau kev teeb tsa ntawm 15℃~ 30 degree, ua kom pom tseeb cais tawm.
4. Matching Arc Extinction Design nrog Fuse Tube
High -kub hluav taws xob arc mus txog 6000K tsim ntawm fuse tam sim. Lub raj fuse (ua los ntawm cov ntawv hlau liab lossis epoxy gas- ua ntawv) decomposes thiab tso tawm loj H₂ thiab CO₂ nyob rau hauv qhov kub arc. Siab- siab nyob rau hauv cov pa roj ua rau longitudinal arc tshuab los tua arc ntawm lub hwj chim- zaus xoom- hla thiab tsis txhob txuas ntxiv arc hlawv puas tsuaj rau cov khoom siv thiab lub raj lub cev.
5. Basic Thermal Theory
Ua raws li Joule-Lenz Law: \\(\\boldsymbol{Q=I^2Rt}\\)
Rated load: Thaum tshav kub kub tiam Tsawg dua los yog sib npaug ntawm cov cua kub dissipation, qhov kub thiab txias ua haujlwm tas li;
Overload: Thaum tshav kub kub ntau tshaj qhov cua sov dissipation, kub nce maj mam ua rau ncua kev sib txuas ntawm cov nyhuv metallurgical;
luv luv Circuit Court: Surge tam sim no accumulates instantaneous tshav kub kom vaporize nqaim caj dab thiab ua tiav instantaneous tawg.
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