Industrial electric heating furnaces – Induction furnace device – Core-type
Patent
1997-03-10
1999-09-14
Hoang, Tu Ba
Industrial electric heating furnaces
Induction furnace device
Core-type
373164, H05B 620
Patent
active
059533633
ABSTRACT:
A channel furnace for the inductive heating of metal includes a molten metal holding hearth and a core and coil assembly surrounded by a channel of the furnace for inducing heating current in the metal in the channel. The channel is separated from the core and coil assembly by a refractory insulator and a bushing interposed between the refractory insulator and the core and coil assembly. The bushing is comprised of a wall portion having a plurality of slits or gaps disposed in the wall for minimizing eddy current formation therein and correspondingly reducing power loss therefrom. The bushing can be configured as either a coil type comprised of a plurality of slits disposed to extend circumferentially or a cage type, wherein the slits are disposed to extend longitudinally for segregating the wall into a plurality of wall sections. Both types can be made of water cooled flat metal tubes instead of plates with slits.
REFERENCES:
patent: 3320348 (1967-05-01), Seulen et al.
patent: 3775091 (1973-11-01), Cites et al.
patent: 4021602 (1977-05-01), Delassis
patent: 5222097 (1993-06-01), Powell et al.
patent: 5257281 (1993-10-01), Cignetti et al.
patent: 5272720 (1993-12-01), Cignetti et al.
Ajax Magnethermic Corporation
Hoang Tu Ba
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