GB1517228A – Furnaces
– Google Patents
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
1977-03-10
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.)
1977-03-10
Filing date
1977-03-10
Publication date
1978-07-12
1977-03-10
Application filed by Post Office
filed
Critical
Post Office
1977-03-10
Priority to GB611976A
priority
Critical
patent/GB1517228A/en
1978-07-12
Publication of GB1517228A
publication
Critical
patent/GB1517228A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
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
1977
1977-03-10
GB
GB611976A
patent/GB1517228A/en
not_active
Expired
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
1978-11-08
PS
Patent sealed
1981-02-11
746
Register noted ‘licences of right’ (sect. 46/1977)
1983-10-26
PCNP
Patent ceased through non-payment of renewal fee
