GB1517228A - Furnaces - Google Patents

Furnaces

Info

Publication number
GB1517228A
GB1517228A GB611976A GB611976A GB1517228A GB 1517228 A GB1517228 A GB 1517228A GB 611976 A GB611976 A GB 611976A GB 611976 A GB611976 A GB 611976A GB 1517228 A GB1517228 A GB 1517228A
Authority
GB
United Kingdom
Prior art keywords
furnace
heating
heating element
ingress
casing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB611976A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Post Office
Original Assignee
Post Office
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Post Office filed Critical Post Office
Priority to GB611976A priority Critical patent/GB1517228A/en
Publication of GB1517228A publication Critical patent/GB1517228A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/62—Heating elements specially adapted for furnaces
    • H05B3/64—Heating elements specially adapted for furnaces using ribbon, rod, or wire heater
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01—Manufacture of glass fibres or filaments
    • C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
    • C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
    • C03B37/029—Furnaces therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D11/00—Arrangement of elements for electric heating in or on furnaces
    • F27D11/02—Ohmic resistance heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D11/00—Arrangement of elements for electric heating in or on furnaces
    • F27D11/06—Induction heating, i.e. in which the material being heated, or its container or elements embodied therein, form the secondary of a transformer
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2205/00—Fibre drawing or extruding details
    • C03B2205/60—Optical fibre draw furnaces
    • C03B2205/62—Heating means for drawing
    • C03B2205/63—Ohmic resistance heaters, e.g. carbon or graphite resistance heaters
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2205/00—Fibre drawing or extruding details
    • C03B2205/60—Optical fibre draw furnaces
    • C03B2205/70—Draw furnace insulation
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2205/00—Fibre drawing or extruding details
    • C03B2205/60—Optical fibre draw furnaces
    • C03B2205/80—Means for sealing the preform entry or upper end of the furnace
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2205/00—Fibre drawing or extruding details
    • C03B2205/60—Optical fibre draw furnaces
    • C03B2205/82—Means for sealing the fibre exit or lower end of the furnace
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2205/00—Fibre drawing or extruding details
    • C03B2205/60—Optical fibre draw furnaces
    • C03B2205/90—Manipulating the gas flow through the furnace other than by use of upper or lower seals, e.g. by modification of the core tube shape or by using baffles

Abstract

1517228 Electrically heated furnaces POST OFFICE 10 March 1977 [17 Feb 1976] 06119/76 Heading F4B [Also in Division H5] A furnace for heating straight elongate workpieces, e.g. a silica pre-form to enable a dielectric optical waveguide to be drawn from it, comprises a tubular graphite heating element 1 located within a casing 2, carbon foam insulation 3 partly filling the space between the heating element 1 and the casing 2, and means to prevent the ingress of air into the furnace. Iris diaphragms 14 and 16 are provided to enable the effective inlet and outlet areas of the furnace to be controlled. Inert gas, e.g. argon, is supplied to the furnace interior from a chamber 12 surrounding the outlet from the furnace, with the flow of inert gas into the chamber 12 through a pipe 13 being adjusted to prevent the ingress of air into the heating zone. The heating element 1, which includes a central portion 4 having a reduced wall thickness into which a helical groove 5 is machined, is either heated directly by passing a current through it or by a R-F heating coil surrounding it. As shown current is applied to the element 1 via water cooled electrodes 9 and 10, with top electrode 9 being mounted on a pair of aluminium discs 11. A graphite foil 6 acting as a heat reflector surrounds the element 1. The heating zone temperature is measured through a lens 17 using an optical pyrometer.
GB611976A 1977-03-10 1977-03-10 Furnaces Expired GB1517228A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB611976A GB1517228A (en) 1977-03-10 1977-03-10 Furnaces

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB611976A GB1517228A (en) 1977-03-10 1977-03-10 Furnaces

Publications (1)

Publication Number Publication Date
GB1517228A true GB1517228A (en) 1978-07-12

Family

ID=9808742

Family Applications (1)

Application Number Title Priority Date Filing Date
GB611976A Expired GB1517228A (en) 1977-03-10 1977-03-10 Furnaces

Country Status (1)

Country Link
GB (1) GB1517228A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0850890A1 (en) * 1996-12-30 1998-07-01 Alcatel Furnace for drawing an optical fibre preform
CN113847805A (en) * 2021-09-28 2021-12-28 山东交通学院 Ultra-high temperature sintering furnace
CN114858501A (en) * 2022-07-11 2022-08-05 中国飞机强度研究所 Aerospace plane structure extreme high-temperature oxygen-containing environment thermal test device and control method

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0850890A1 (en) * 1996-12-30 1998-07-01 Alcatel Furnace for drawing an optical fibre preform
FR2757846A1 (en) * 1996-12-30 1998-07-03 Alsthom Cge Alcatel FIBERING OVEN FOR AN OPTICAL FIBER PREFORM
US5848093A (en) * 1996-12-30 1998-12-08 Alcatel Alsthom Compagnie Generale D'electricite Fiber-drawing furnace for drawing down an optical-fiber preform into an optical fiber
CN113847805A (en) * 2021-09-28 2021-12-28 山东交通学院 Ultra-high temperature sintering furnace
CN113847805B (en) * 2021-09-28 2023-07-21 山东交通学院 Superhigh temperature sintering furnace
CN114858501A (en) * 2022-07-11 2022-08-05 中国飞机强度研究所 Aerospace plane structure extreme high-temperature oxygen-containing environment thermal test device and control method

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Legal Events

Date Code Title Description
PS Patent sealed
746 Register noted 'licences of right' (sect. 46/1977)
PCNP Patent ceased through non-payment of renewal fee