US2620366A - Induction stirrer - Google Patents

Induction stirrer Download PDF

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Publication number
US2620366A
US2620366A US199740A US19974050A US2620366A US 2620366 A US2620366 A US 2620366A US 199740 A US199740 A US 199740A US 19974050 A US19974050 A US 19974050A US 2620366 A US2620366 A US 2620366A
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US
United States
Prior art keywords
furnace
winding
coils
layer
troughs
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 - Lifetime
Application number
US199740A
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English (en)
Inventor
Ladell Emil
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.)
ABB Norden Holding AB
Original Assignee
ASEA AB
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
Priority to BE513348D priority Critical patent/BE513348A/xx
Application filed by ASEA AB filed Critical ASEA AB
Priority to US199740A priority patent/US2620366A/en
Application granted granted Critical
Publication of US2620366A publication Critical patent/US2620366A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • H05B7/00—Heating by electric discharge
    • H05B7/02—Details
    • 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
    • H05B6/34—Arrangements for circulation of melts
    • 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
    • H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
    • H05B2213/02—Stirring of melted material in melting furnaces

Definitions

  • the arrangement consists of a multiphase winding arranged below the bottom ⁇ of the furnace and traversed by a low frequency alternating current. According to said application, the winding is arranged in U-shaped troughs of iron which are welded to or in some other Way attached to an iron core arranged below the bottom of the furnace and built up from comparatively thick iron sheets.
  • this core is divided into a plurality of parts, in order to allow cooling air to flow up between them, and further the said troughs are attached to the core only in certain points, which on one hand facilitates the cooling and on the other hand makes f the manufacturing simpler and cheaper.
  • the present invention concerns a modification of the arrangement described in said application and is chiefly characterised thereby that the conductors of the winding are formed by pipes traversed by a cooling liquid, preferably water, and thereby that between the winding and the bottom of the furnace a heat insulating layer of some refractory material is arranged to prevent molten metal from coming in contact with the winding in the case that the bottom of the furnace should be penetrated by the metal.
  • a cooling liquid preferably water
  • Fig. 1 shows a vertical section through a part of the furnace along the line B-B, in Fig. 2,
  • FIG. 3 is a cross section through the furnace along the line C-C
  • Fig. 4 a section through the winding along the line E-E in Fig. 6, which shows a detail of the section C-C in an enlarged scale
  • Fig. 5 shows a section along the line F-F in Fig. 6.
  • l designates the lining of the furnace and 2 the molten charge
  • 3 is the metallic bottom of the furnace below the lining, which bottom is made of a non-magnetic metal.
  • 4 designates the coils of the stirring winding and 2l a cap of metal protecting the ends of the coils, and 6 a terminal block with links for connecting together the different coils.
  • 20 designates a continuous layer of a heat resisting insulating material arranged between the coils 4 and the bottom 3 of the furnace, which layer in the case that the lining 2 of the furnace should break and the molten metal penetrate the bottom 3, prevents the molten metal from coming in contact with the coils 4.
  • the coils consist of pipe-shaped copper conductors 1, which are surrounded by a comparatively thin insulation and located in U-shaped troughs of iron 8, which are divided into a plurality of comparatively short parts and extend perpendicularly to the iron cores Il, I2, and i3 (Fig. 3), which cores are piled up by thick sheets 9, l0 and l0.
  • the sheets I0 and l0' project above the sheets 9, so that the troughs 8 will be in contact only with the rst mentioned sheets.
  • the copper conductors 1 are held down in the troughs 8 by means of fiat bars I4 which, in their turn, are held down by bolts Il with nuts I3.
  • the winding coils In order to protect the winding coils, they are surrounded by a cap 2l of iron sheet, which is carried by the bars I4, and the sheets l0', which are attached to the bottom of the cap 2i.
  • the cooling liquid is delivered to and drawn off from the Winding coils by distributing boxes 22 and 23, which may be pipe-shaped and provided with a plurality of valves 24 and 25 which, in their turn, by means of rubber pipes 28 and 29 are connected to valves 28 and 27 which, in their turn, by metal pipes 30 and 3l are connected to the conductors 1 of the different coils.
  • one of the coils should be damaged, it can be put out of function by means of links on the terminal block 6, and the delivery of water to the said coil can also be shut off by means of valves 24, 25, 28, 21. It is thus possible to have the furnace in service also if one or a plurality of the coils should be damaged, however with a reduced stirring action.
  • An electric melting furnace having means for the generation of a stirring magnetic eld in the molten charge, comprising iron cores located below the bottom of the furnace, channels at the upper side ofr the corea multi-phase winding having rtubular conductorsk arranged in said channels,- means for passing a cooling liquid through said conductors, said winding being traversed by a low frequency alternating current, and-a layer of heat insulating material interposed between said winding and the bottom of the furnace to intercept molten metal that may penetrate the bottom of the furnace, said layerv being spaced from thebottompf ⁇ the furnace and having ⁇ at least one side edge part thereof disposed at the lowest portion of ⁇ said layer to spill outwardly therefrom, by gravity, any molten metal received from the furnace.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Furnace Details (AREA)
US199740A 1950-12-08 1950-12-08 Induction stirrer Expired - Lifetime US2620366A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
BE513348D BE513348A (it) 1950-12-08
US199740A US2620366A (en) 1950-12-08 1950-12-08 Induction stirrer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US199740A US2620366A (en) 1950-12-08 1950-12-08 Induction stirrer

Publications (1)

Publication Number Publication Date
US2620366A true US2620366A (en) 1952-12-02

Family

ID=22738816

Family Applications (1)

Application Number Title Priority Date Filing Date
US199740A Expired - Lifetime US2620366A (en) 1950-12-08 1950-12-08 Induction stirrer

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US (1) US2620366A (it)
BE (1) BE513348A (it)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2711436A (en) * 1952-08-14 1955-06-21 Babcock & Wilcox Co Fluid material container with inclined slotted bottom having inductive stirring device adjacent thereto for an electric furnace
US2767236A (en) * 1954-10-14 1956-10-16 James W Williamson Magnetic stirrer for molten metal furnaces
US2774803A (en) * 1952-09-20 1956-12-18 Asea Ab Inductive stirring device for metallurgical furnace
US2835717A (en) * 1956-02-02 1958-05-20 Asea Ab Stirring winding system for metallurgical furnaces
US2875261A (en) * 1957-02-26 1959-02-24 Swindell Dressler Corp Magnetomotive agitator for molten metal baths or the like
US3363044A (en) * 1965-03-13 1968-01-09 Asea Ab Channel type induction furnace

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1059153B (de) * 1956-02-02 1959-06-11 Asea Ab Elektrisch wirkende Ruehreinrichtung fuer metallurgische OEfen, bestehend aus einem stabfoermigen Eisenkern und hierauf aufgeschobenen Zylinderspulen

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US428379A (en) * 1890-05-20 Electric induction device
US1818107A (en) * 1927-12-07 1931-08-11 Ajax Electrothermic Corp High frequency coil for electric induction furnaces
US1834445A (en) * 1929-04-20 1931-12-01 Westinghouse Electric & Mfg Co Inductor coil
US1861870A (en) * 1930-10-06 1932-06-07 Westinghouse Electric & Mfg Co Induction furnace
US1922034A (en) * 1931-11-23 1933-08-15 Ajax Electrothermic Corp Protective device for electric induction furnaces
US2041333A (en) * 1932-04-09 1936-05-19 Heraeus Vacuumschmelze Ag Apparatus for producing carbonfree metals, alloys, and the like
US2363582A (en) * 1941-11-17 1944-11-28 Gerber Jack Sydney Method of and means for stirring or circulating molten or liquid materials or mediums
US2433495A (en) * 1945-05-31 1947-12-30 Allis Chalmers Mfg Co Tilting induction furnace with leads extending through a trunnion
US2513082A (en) * 1944-11-30 1950-06-27 Asea Ab Induction stirrer

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US428379A (en) * 1890-05-20 Electric induction device
US1818107A (en) * 1927-12-07 1931-08-11 Ajax Electrothermic Corp High frequency coil for electric induction furnaces
US1834445A (en) * 1929-04-20 1931-12-01 Westinghouse Electric & Mfg Co Inductor coil
US1861870A (en) * 1930-10-06 1932-06-07 Westinghouse Electric & Mfg Co Induction furnace
US1922034A (en) * 1931-11-23 1933-08-15 Ajax Electrothermic Corp Protective device for electric induction furnaces
US2041333A (en) * 1932-04-09 1936-05-19 Heraeus Vacuumschmelze Ag Apparatus for producing carbonfree metals, alloys, and the like
US2363582A (en) * 1941-11-17 1944-11-28 Gerber Jack Sydney Method of and means for stirring or circulating molten or liquid materials or mediums
US2513082A (en) * 1944-11-30 1950-06-27 Asea Ab Induction stirrer
US2433495A (en) * 1945-05-31 1947-12-30 Allis Chalmers Mfg Co Tilting induction furnace with leads extending through a trunnion

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2711436A (en) * 1952-08-14 1955-06-21 Babcock & Wilcox Co Fluid material container with inclined slotted bottom having inductive stirring device adjacent thereto for an electric furnace
US2774803A (en) * 1952-09-20 1956-12-18 Asea Ab Inductive stirring device for metallurgical furnace
US2767236A (en) * 1954-10-14 1956-10-16 James W Williamson Magnetic stirrer for molten metal furnaces
US2835717A (en) * 1956-02-02 1958-05-20 Asea Ab Stirring winding system for metallurgical furnaces
US2875261A (en) * 1957-02-26 1959-02-24 Swindell Dressler Corp Magnetomotive agitator for molten metal baths or the like
US3363044A (en) * 1965-03-13 1968-01-09 Asea Ab Channel type induction furnace

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Publication number Publication date
BE513348A (it)

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