To provide a heat treatment furnace which has high pressure resistance, high cooling efficiency, reduced weight, and large baking space and which is usable as a vacuum furnace, a depressurized furnace, or a pressurized furnace and is also usable as an electric furnace, a high-temperature gas-cooled reactor, a gas burner furnace, etc.
The double bellows type heat treatment furnace 2 has a housing 13 composed of a double bellows type peripheral wall part 8 formed by arranging outer bellows 10 and inner bellows 12 respectively having peripheral bellows tops 10a, 12a formed in stages in an axial direction in a double-tube shape so that an annular gap 11 is formed, a floor part 4 supporting the double bellows type peripheral wall part 8, and a ceiling part 6 closing an upper opening part of the double bellows type peripheral wall part 8, and circulates cooling water 16 at least to the annular gap 11 to carry out forcible cooling.
FURUTA YOSHIO
KONDO KATSUYOSHI
