GB816261A - A vacuum induction furnace - Google Patents

A vacuum induction furnace

Info

Publication number
GB816261A
GB816261A GB7111/57A GB711157A GB816261A GB 816261 A GB816261 A GB 816261A GB 7111/57 A GB7111/57 A GB 7111/57A GB 711157 A GB711157 A GB 711157A GB 816261 A GB816261 A GB 816261A
Authority
GB
United Kingdom
Prior art keywords
coils
coil
crucible
centre
generator
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
GB7111/57A
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.)
NAT RES CORP
National Research Corp
Original Assignee
NAT RES CORP
National Research 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 NAT RES CORP, National Research Corp filed Critical NAT RES CORP
Publication of GB816261A publication Critical patent/GB816261A/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
    • H05B6/06—Control, e.g. of temperature, of power
    • H05B6/067—Control, e.g. of temperature, of power for melting 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
    • H05B6/26—Crucible furnaces using vacuum or particular gas atmosphere

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Crucibles And Fluidized-Bed Furnaces (AREA)

Abstract

816,261. Induction furnaces. NATIONAL RESEARCH CORPORATION. March 4, 1957 [April 2, 1956], No. 7111/57. Class 39(3) An induction vacuum furnace comprises two induction coils in parallel, one having half its turns 16 surrounding the upper part of the crucible 12 and its remaining turns 18 surrounding the lower part of the crucible, and the other coil being wound to surround a part of the crucible between the half coils. The half coils are connected to the centre coil at their inner ends, and are reverse wound with respect to the centre coil 15; the outer ends of the half coils are connected and are earthed, and the centre of the coil 15 may be earthed by means of a resistor. The coils may be of copper tubing which is water cooled. Power leads from a generator 40 pass through the furnace wall 10 via a coaxial assembly 26 mounted in an insulating bushing 38, connection being made to the centre coil by conductors 28, 36. Passages for the cooling water may be provided in the coaxial assembly 26. The generator may operate at 800 volts and at a frequency of 960 c.p.s. but the earthing provided for the coils ensures that no portion of either coil is at any time more than ¢ the generator voltage above earth. The arrangement of the coils avoids unbalance of the current in them when the crucible is half full by ensuring that the inductance is equal for both coils. Specification 689,726 is referred to.
GB7111/57A 1956-04-02 1957-03-04 A vacuum induction furnace Expired GB816261A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US816261XA 1956-04-02 1956-04-02

Publications (1)

Publication Number Publication Date
GB816261A true GB816261A (en) 1959-07-08

Family

ID=22165327

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7111/57A Expired GB816261A (en) 1956-04-02 1957-03-04 A vacuum induction furnace

Country Status (1)

Country Link
GB (1) GB816261A (en)

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