INDUCTION FURNACE FOR OPERATION AT HIGH TEMPERATURES Russian patent published in 2008 - IPC F27D7/06 F27B13/02 

FIELD: metallurgy.

SUBSTANCE: furnace has a container forming the internal chamber for the placement of products for processing, with a current collector, an induction coil, which induces current in the current collector for its heating, and a water-cooled roof. When the temperature in the hot zone of the furnace reaches approximately 1500°C, a lifting tackle installed on the roof lifts the furnace cover allowing hot gases from the hot zone to mix with cooler gas in the roof area. This quickens the hot zone cooling, reduces cooling periods significantly, and eliminates the need to fit the furnace with excessive valves or other complicated cooling devices, which should be replaced periodically. The service life of the graphite current collector of the furnace at a high operating temperature increases due to enclosing the current collector with a barrier layer of flexible graphite retaining the graphite evaporation. Check disks inside of the current collector provide for obtaining accurate temperature profile of the hot zone.

EFFECT: increase in furnace run, decrease in cooling time due to simple elimination of cooling device, replacement of current collector and other structural elements of hot zone, and increase in accuracy of temperature change monitoring throughout furnace hearth.

27 cl, 11 dwg