Heating apparatus of induction furnace used for stretching large-diameter preformed rods of optical fibers
AssigneeYangze Optical Fibre and Cable Company, Ltd.
InventorsDongquan Fang, Tao Wang, Jianhua Sun
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Abstract
A heating apparatus of an induction furnace used for stretching large-diameter preformed rods of optical fibers, said heating apparatus of the induction furnace comprising a furnace casing, a graphite exothermic sleeve, an insulating layer and an induction coil. At the upper end of the graphite exothermic sleeve is provided a floating seal gland, the inner bore thereof being adapted to the upper end of the graphite exothermic sleeve, and the outer periphery of the floating seal gland being adapted to the top cover plate furnace hole of the furnace casing. The use of the floating seal gland increases furnace stability and prolongs furnace life.
Claims13
A heating apparatus of an induced fiber drawing furnace for large-diameter optical fiber preformed rods, comprising:
- a cannular furnace casing defining a furnace cavity;
- a graphite exothermic sleeve defining a bore, mounted in the furnace cavity;
- a heat-insulation layer surrounding around the graphite exothermic sleeve;
- and
- an induction coil surrounding around the heat-insulation layer,
- wherein a diameter of the bore of the graphite exothermic sleeve is in a range of 150 to 240 mm, and an axial length of the graphite exothermic sleeve is in a range of 500 to 800 mm;
- wherein a maximum power of the induction coil is in a range of 80 to 100 kilowatt;
- wherein an upper end of the graphite exothermic sleeve is provided with a floating sealing gland, a bore of the floating sealing gland is matched with the upper end of the graphite exothermic sleeve, and a periphery of the floating sealing gland is matched with a furnace cavity aperture of a top cover plate of the furnace casing.
Dependencies are inferred from the claim text.