GB1466159A - Electrical furnace - Google Patents

Electrical furnace

Info

Publication number
GB1466159A
GB1466159A GB1790174A GB1790174A GB1466159A GB 1466159 A GB1466159 A GB 1466159A GB 1790174 A GB1790174 A GB 1790174A GB 1790174 A GB1790174 A GB 1790174A GB 1466159 A GB1466159 A GB 1466159A
Authority
GB
United Kingdom
Prior art keywords
triac
current
resistor
electrodes
capacitor
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
GB1790174A
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.)
Saint Gobain Ceramics and Plastics Inc
Original Assignee
Corhart Refractories Corp
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 Corhart Refractories Corp filed Critical Corhart Refractories Corp
Publication of GB1466159A publication Critical patent/GB1466159A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
    • C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
    • C03B5/167—Means for preventing damage to equipment, e.g. by molten glass, hot gases, batches
    • C03B5/1677—Means for preventing damage to equipment, e.g. by molten glass, hot gases, batches by use of electrochemically protection means, e.g. passivation of electrodes
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
    • C03B5/02—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture in electric furnaces, e.g. by dielectric heating
    • C03B5/027—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture in electric furnaces, e.g. by dielectric heating by passing an electric current between electrodes immersed in the glass bath, i.e. by direct resistance heating
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/12—Regulating voltage or current wherein the variable actually regulated by the final control device is ac
    • G05F1/40—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using discharge tubes or semiconductor devices as final control devices
    • G05F1/44—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using discharge tubes or semiconductor devices as final control devices semiconductor devices only
    • G05F1/445—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using discharge tubes or semiconductor devices as final control devices semiconductor devices only being transistors in series with the load
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/12—Regulating voltage or current wherein the variable actually regulated by the final control device is ac
    • G05F1/40—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using discharge tubes or semiconductor devices as final control devices
    • G05F1/44—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using discharge tubes or semiconductor devices as final control devices semiconductor devices only
    • G05F1/45—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using discharge tubes or semiconductor devices as final control devices semiconductor devices only being controlled rectifiers in series with the load
    • G05F1/455—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using discharge tubes or semiconductor devices as final control devices semiconductor devices only being controlled rectifiers in series with the load with phase control
    • 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
    • H05B3/0019—Circuit arrangements
    • H05B3/0023—Circuit arrangements for heating by passing the current directly across the material to be heated
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S65/00—Glass manufacturing
    • Y10S65/04—Electric heat

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Power Engineering (AREA)
  • Electromagnetism (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Electrochemistry (AREA)
  • Physics & Mathematics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Furnace Details (AREA)
  • Control Of Resistance Heating (AREA)
  • Glass Melting And Manufacturing (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)

Abstract

1466159 Automatic current control CORHART REFRACTORIES CO 24 April 1974 [30 April 1973] 17901/74 Heading G3R [Also in Divisions H3-5] A circuit for controlling the supply of current to the electrodes of a furnace for melting thermoplastic material comprises a resistor 52 in series with a triac 46 in the supply line to the electrodes, the voltage across the triac being fed to a capacitor 60, having a bias due to photo-resistor 58, so that this capacitor charges and fires uni-junction transsistor 62 to produce pulses which fire the triac 46. If the current in the supply line increases, the voltage across the resistor 52 rises and lamp 56 becomes brighter thus reducing the value of photoresistor 58, decreasing the bias on capacitor 60 and causing the uni-junction transistor 62 and thus the triac to be fired later to decrease the current to the electrodes. A further circuit is described, Figs. 5A, 5B (not shown), with provision for regulating the D.C. component of the electrode current.
GB1790174A 1973-04-30 1974-04-24 Electrical furnace Expired GB1466159A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00355877A US3818112A (en) 1973-04-30 1973-04-30 Electrical furnace for melting glass

Publications (1)

Publication Number Publication Date
GB1466159A true GB1466159A (en) 1977-03-02

Family

ID=23399181

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1790174A Expired GB1466159A (en) 1973-04-30 1974-04-24 Electrical furnace

Country Status (9)

Country Link
US (1) US3818112A (en)
JP (1) JPS5013939A (en)
BE (1) BE814414A (en)
CA (1) CA1007686A (en)
DE (1) DE2420749A1 (en)
FR (1) FR2227706B1 (en)
GB (1) GB1466159A (en)
IT (1) IT1010289B (en)
NL (1) NL7405742A (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3967046A (en) * 1975-02-18 1976-06-29 Owens-Corning Fiberglas Corporation Apparatus and method for increasing furnace life in an electric furnace for thermoplastic materials
IT7940024A0 (en) * 1979-02-19 1979-02-19 Tironi Electromecc METHOD FOR THE MELTING OF GLASSY MATERIALS AND USE OF A DEVICE SUITABLE FOR CARRYING OUT THE METHOD
DE3017374C1 (en) * 1980-05-07 1982-08-26 Eglasstrek Patent Promotion & Awarding GmbH, 6203 Hochheim Device for the production of glass fibers
US4413346A (en) * 1981-11-04 1983-11-01 Corning Glass Works Glass-melting furnace with batch electrodes
US4737966A (en) * 1987-01-12 1988-04-12 Corning Glass Works Electric melter for high electrical resistivity glass materials
US4741753A (en) * 1987-03-12 1988-05-03 Owens-Corning Fiberglas Corporation Method and apparatus for electrically heating molten glass
DE10041757C1 (en) * 2000-08-25 2002-02-21 Schott Glas Method and device for refining glass
FR2892497B1 (en) * 2005-10-24 2008-07-04 Air Liquide COMBUSTION METHOD MIXED IN A REGENERATING OVEN
CN101407368B (en) * 2008-10-23 2011-02-02 黎国琪 Special electrical kiln for burning coloured glaze pieces and control method thereof
TWI764952B (en) * 2016-11-08 2022-05-21 美商康寧公司 Apparatus and method for forming a glass article
JP2023091397A (en) * 2021-12-20 2023-06-30 日本電気硝子株式会社 Method and device for manufacturing glass article

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3395237A (en) * 1967-05-03 1968-07-30 Harold S. Orton Electric resistance furnace

Also Published As

Publication number Publication date
IT1010289B (en) 1977-01-10
CA1007686A (en) 1977-03-29
DE2420749A1 (en) 1974-11-21
BE814414A (en) 1974-10-30
US3818112A (en) 1974-06-18
NL7405742A (en) 1974-11-01
FR2227706A1 (en) 1974-11-22
FR2227706B1 (en) 1978-01-20
JPS5013939A (en) 1975-02-13

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Legal Events

Date Code Title Description
49S Specification amended (sect. 9/1949)
PS Patent sealed [section 19, patents act 1949]
SP Amendment (slips) printed
PCNP Patent ceased through non-payment of renewal fee