To provide an electric resistance furnace for reducing thermal damage to a preheating heating element, and requiring no arrangement of a heating means by a heating medium in the electric resistance furnace using the heating element having a high heat resistant temperature such as a zirconic heating element.
This electric resistance furnace is provided with a central furnace body composed of the hollow central heating element 2 for vertically arranging the shaft direction and a heat insulating member 6 for holding this heating element and a preheating means having the preheating heating element 10 on a cylindrical inner wall surface of a heat insulating member 9 by arranging a void 8 from a surface of the central furnace body. In the electric resistance furnace, heat insulating members 13a, 13b and 14 are arranged only on the central shaft side of a projection part of the preheating means of an upper surface and an under surface of an outer peripheral part heat insulating member 11 arranged around the preheating means.
Ryukichi Abe
Hirukawa Masanobu
Hiroki Shirai
Norihiko Uchida
Hideo Sugai
Kenji Aoki
Hiroshi Nagisawa
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