Heating – Work chamber having heating means – Work chamber having gaseous material supply or removal...
Patent
1977-12-15
1979-05-01
Camby, John J.
Heating
Work chamber having heating means
Work chamber having gaseous material supply or removal...
13 31R, F27B 504
Patent
active
041521110
ABSTRACT:
Disclosed is an elongated cylindrical furnace that includes a housing which defines an internal pressure chamber. An annular heater is disposed in the chamber in surrounding relationship to a centrally disposed material treatment space and an insulation layer is disposed in surrounding relationship to the heater. An annular gas impermeable wall is disposed in the chamber between the heater and the treatment space to isolate the latter from the space outside the wall where the heater is located. The outer heater space and the inner material treatment space are each provided with a respective source of pressurized gas for pressurization of the furnace to operating pressure. Thus, the amount of pressurized gas in contact with the material undergoing treatment is minimized and limited by the volume of the inner space and contact between gas from the inner space which may have become contaminated by contact with the material undergoing treatment and hard to clean furnace components in the outer space is limited by the presence of the wall. Also disclosed are various means for controlling the relative gas pressures in the inner and outer spaces.
REFERENCES:
patent: 3427011 (1969-02-01), Boyer et al.
patent: 3732068 (1973-05-01), Larker
patent: 3775043 (1973-11-01), Johansson et al.
ASEA Aktiebolag
Camby John J.
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