CHANNEL-TYPE ELECTRIC INDUCTION HEATING FURNACE

摘要

A channel-type electric induction heating furnace inductor unit for melting metal, has a metal frame which includes metal side walls having core clearance openings through which a transformer core surrounded by an induction coil extends, the frame supporting refractory forming a channel vertically looping around this core and coil, other core clearance openings being formed through the two walls and the balance of the core extending downwardly outside of these walls and through these other openings to form a closed magnetic flux circuit. Each wall has a gap or slot formed in it and which extends from one opening to the other, the portions of the walls below the core being structurally united or made integral. Since all of the portions of the walls are outside of the core, the formation of eddy currents in the latter are reduced or eliminated. The core is made as two separable parts with one part carrying the induction coil being separable from the furnace and the other core part and the latter comprising a structural part of the frame providing support for the latter.