Device for injecting non-oxidizing gas into a furnace
AssigneeAlcatel Fibres Optiques
InventorsGerard Orcel, Jean-Fran.cedilla.ois Regnier
Life of this patent
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Abstract
Device for injecting non-oxidizing gas into a furnace with a graphite concentrator (12) as the heating element used to heat a primary preform in the enclosure of the furnace (14) and moving relative to the furnace in its axial direction, and comprising at the inlet orifice (24) and at the outlet orifice (26) of the enclosure a respective annular injector (40, 42) for injecting two conical curtains of non-oxidizing gas, the gas for each of the curtains being directed towards the apex of the cone and in the direction away from the enclosure (14) so as to prevent any entry into the enclosure of air that could cause combustion of the graphite.
Claims8
A high temperature induction furnace comprising a graphite concentrator heating element (12) surrounding a cylindrical enclosure (14) which has an inlet orifice (24) and an outlet orifice (26) at opposite ends thereof, an elongate object disposed in said enclosure between the inlet orifice and the outlet orifice, said object being movable along an axial direction of the enclosure, and a device for injecting non-oxidizing gas into said enclosure, wherein said device comprises two rings of conduits (58, 60 and 62, 64) through which non-oxidizing gas passes, said rings being individually disposed at said opposite ends, the conduits of each ring being inclined at the same angle to the axial direction and said angle being different for the two rings of conduits, so as to inject the non-oxidizing gas into two conical shape gas curtains, the gas being directed towards an apex of a cone defined by each of said gas curtains and in the direction away from said enclosure to prevent any entry into said enclosure of air that could cause combustion of the graphite concentrator heating element.
Dependencies are inferred from the claim text.