GB704960A - Improvements to electric induction furnaces - Google Patents

Improvements to electric induction furnaces

Info

Publication number
GB704960A
GB704960A GB2669250A GB2669250A GB704960A GB 704960 A GB704960 A GB 704960A GB 2669250 A GB2669250 A GB 2669250A GB 2669250 A GB2669250 A GB 2669250A GB 704960 A GB704960 A GB 704960A
Authority
GB
United Kingdom
Prior art keywords
coil
conductors
circuit
induction
energized
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
GB2669250A
Inventor
Harry Thomas Kempson
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.)
Henry Wiggin and Co Ltd
Original Assignee
Henry Wiggin and Co Ltd
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 Henry Wiggin and Co Ltd filed Critical Henry Wiggin and Co Ltd
Priority to GB2669250A priority Critical patent/GB704960A/en
Publication of GB704960A publication Critical patent/GB704960A/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
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/22—Furnaces without an endless core
    • H05B6/24—Crucible furnaces
    • 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
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/22—Furnaces without an endless core
    • H05B6/24—Crucible furnaces
    • H05B6/28—Protective systems

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Furnace Details (AREA)
  • General Induction Heating (AREA)

Abstract

704,960. Induction furnaces; alarms. WIGGIN & CO., Ltd., H. Nov. 1, 1951 [Nov. 1, 1950], No. 26692/50. Class 39 (3) An induction furnace has a safety device comprising two sets of conductors 12, 14 incorporated in a flexible screen of heatresisting material mounted in the furnace wall inside the induction coil, the two sets of conductors being normally insulated from one another and from the coil, the conductors being so arranged that molten metal leaking through the wall will, before reaching the coil, form a bridge between a conductor 12 and a conductor 14, thereby closing a circuit to actuate an alarm and preferably cut off current supply to the coil. The conductors comprise parallel vertical wires 12, 14 woven into a flexible screen with asbestos thread 16 and connected alternately to bus bars 17. 18. The screen is insulated from the coil by a ring of mica. When molten metal bridges the wires 12, 14 a circuit is completed through a transformer 20 and the alarm 22 is energized. The circuit includes a choke 24 and condenser 26 so that it is not energized by the H.F. current.
GB2669250A 1950-11-01 1950-11-01 Improvements to electric induction furnaces Expired GB704960A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2669250A GB704960A (en) 1950-11-01 1950-11-01 Improvements to electric induction furnaces

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2669250A GB704960A (en) 1950-11-01 1950-11-01 Improvements to electric induction furnaces

Publications (1)

Publication Number Publication Date
GB704960A true GB704960A (en) 1954-03-03

Family

ID=10247688

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2669250A Expired GB704960A (en) 1950-11-01 1950-11-01 Improvements to electric induction furnaces

Country Status (1)

Country Link
GB (1) GB704960A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0152849A2 (en) * 1984-02-06 1985-08-28 Asea Ab Casting ladle or tundish
DE4322463A1 (en) * 1993-07-06 1995-01-12 Leybold Durferrit Gmbh Early-warning device for induction melting furnaces
DE19602249A1 (en) * 1996-01-23 1997-07-24 Ald Vacuum Techn Gmbh Early warning system for molten metal break-through in induction furnaces

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0152849A2 (en) * 1984-02-06 1985-08-28 Asea Ab Casting ladle or tundish
EP0152849A3 (en) * 1984-02-06 1985-10-09 Asea Ab Casting ladle or tundish
DE4322463A1 (en) * 1993-07-06 1995-01-12 Leybold Durferrit Gmbh Early-warning device for induction melting furnaces
DE19602249A1 (en) * 1996-01-23 1997-07-24 Ald Vacuum Techn Gmbh Early warning system for molten metal break-through in induction furnaces

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