US1645526A - High-frequency electric furnace - Google Patents
High-frequency electric furnace Download PDFInfo
- Publication number
- US1645526A US1645526A US96942A US9694226A US1645526A US 1645526 A US1645526 A US 1645526A US 96942 A US96942 A US 96942A US 9694226 A US9694226 A US 9694226A US 1645526 A US1645526 A US 1645526A
- Authority
- US
- United States
- Prior art keywords
- crucible
- frequency electric
- electric furnace
- coil
- furnace
- 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
Links
- 238000010438 heat treatment Methods 0.000 description 7
- 239000006185 dispersion Substances 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 238000004804 winding Methods 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000009877 rendering Methods 0.000 description 2
- 229940000425 combination drug Drugs 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
Images
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
- H05B6/36—Coil arrangements
- H05B6/367—Coil arrangements for melting furnaces
Definitions
- the present invention relates to electric furnaces suitable for heating or melting metals and of the type in which hi h fre quency alternating current is passed trough l a heating coil located outside the Crucible, and the metal contained in the Crucible isv heated by the eddy currents generated therein. If, in such a furnace, the heating 1 is merely wound around the cylindrically l0 shaped Crucible 2, in the manner indicated in Figure 1 of the accompanying drawing, there is considerable marginal dispersion or fringing of the magnetic field, as indicated by the dotted lines in the drawings, with the result that a comparatively large percentage of the lines of force does not permeate the metal within the Crucible, thereby decreasing the efficiency of the furnace. It is the object of the present invention to overcome this disadvantage.
- Figure 1 is a view in elevation, the coil appearing in section of a cylindrical Crucible with conventional Wind- 0 ing, illustrating the dispersion of themagnetic field which occurs with such a winding
- Figure 2 is a vertical section through a Cylindrical Crucible with a winding in accordance with the principle Aof my invention
- Figure 3 is a horizontal section throu h an elliptical Crucible with a winding embodgying the principle of my invention.
- the coil 1 is constituted by a cylindrical of the Crucible, thereby so dimensioning the turns with respect to those portions of the Crucible which they embrace that the created lines of force will be properly proportioned l and directed according to the transverse d1- mensions of that part of the Crucible which each coil turn envelops.
- the dotted lines in Figures 2 and 3 indicate lines of magnetic force, and it is seen that the number permeating the metal within the Crucible 2 is increased in comparison with those indicated in Figure 1, without any perceptiblefringing or marginal dispersion.
- a high frequency electric furnace of the Character described comprising in combi nation a Crucible, and a heating coil embrac ing the Crucible and Wound so that at least certain of its turns decrease in diameter, rendering it conformatory in contour to the contour of the Crucible, whereby marginal dispersion or fringing of the magnetic field is minimized and the number of lines of force permeating the Crucible and producing the heating action is increased.
- a high frequency electric furnace of the Character described Comprising in combination an elliptical Crucible, and a heating coil embracing the Crucible and having its turns decreasing in diameter from the sides to'- wards the ends of the Crucible so as to conform ⁇ to the contour of the Crucible.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Induction Heating (AREA)
- Crucibles And Fluidized-Bed Furnaces (AREA)
Description
Oct. 18,1927. F GERTH 1,645,526
HIGH FREQUENCY ELECTRIC FURNCE Filed umh 24, 192'6 Parenteel oct. is, 1927.
UNITED STATES PATENT OFFICE.
FELIX GERTH, OF BERLINLTEMPELHOF, GERMANY, .ASSIGNOR T C. LORENZ AKTIEN'- GESELLSCHAFT, OF '.BERLIN-TEMPELHOF, GERMANY.
HIGH-FREQUENCY ELECTRIC FURNACE.
Application led Hatch 24, 1926, Serial No. 96,942, and in Germany, March 2p, 192.5.
The present invention relates to electric furnaces suitable for heating or melting metals and of the type in which hi h fre quency alternating current is passed trough l a heating coil located outside the Crucible, and the metal contained in the Crucible isv heated by the eddy currents generated therein. If, in such a furnace, the heating 1 is merely wound around the cylindrically l0 shaped Crucible 2, in the manner indicated in Figure 1 of the accompanying drawing, there is considerable marginal dispersion or fringing of the magnetic field, as indicated by the dotted lines in the drawings, with the result that a comparatively large percentage of the lines of force does not permeate the metal within the Crucible, thereby decreasing the efficiency of the furnace. It is the object of the present invention to overcome this disadvantage.
According to this invention the heating.
coil in a furnace of the type referred to is wound so that its turns decrease in diameter towards either or both of its ends, rendering it conformatory in contour to the Contour of the Crucible, the above-mentioned mar-- inal dispersion or fringing of the magnetic eld with respect to thevmetal to be heated in the Crucible is minimized, or in other Words, the energy expended in the Coil is to a greater extent concentrated upon the metal lo be heated.
In order that the invention may bevclearly understood and readily carried into effect, it will vnow be described more fully with `reference to Figures 2 to' 3 of the accompanying drawing, in which Figure 1 is a view in elevation, the coil appearing in section of a cylindrical Crucible with conventional Wind- 0 ing, illustrating the dispersion of themagnetic field which occurs with such a winding; Figure 2 is a vertical section through a Cylindrical Crucible with a winding in accordance with the principle Aof my invention; 5 and Figure 3 is a horizontal section throu h an elliptical Crucible with a winding embodgying the principle of my invention.
n the form of furnace depicted in Figure coil '2, the coil 1 is constituted by a cylindrical of the Crucible, thereby so dimensioning the turns with respect to those portions of the Crucible which they embrace that the created lines of force will be properly proportioned l and directed according to the transverse d1- mensions of that part of the Crucible which each coil turn envelops. The dotted lines in Figures 2 and 3 indicate lines of magnetic force, and it is seen that the number permeating the metal within the Crucible 2 is increased in comparison with those indicated in Figure 1, without any perceptiblefringing or marginal dispersion.
1. A high frequency electric furnace of the Character described comprising in combi nation a Crucible, and a heating coil embrac ing the Crucible and Wound so that at least certain of its turns decrease in diameter, rendering it conformatory in contour to the contour of the Crucible, whereby marginal dispersion or fringing of the magnetic field is minimized and the number of lines of force permeating the Crucible and producing the heating action is increased.
2. A high frequency electric furnace of the Character described, Comprising in combination an elliptical Crucible, and a heating coil embracing the Crucible and having its turns decreasing in diameter from the sides to'- wards the ends of the Crucible so as to conform` to the contour of the Crucible.
`In testimony whereof Ihave aiiixed my signature.`
ELIX GERTH
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1645526X | 1925-03-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
US1645526A true US1645526A (en) | 1927-10-18 |
Family
ID=7738087
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US96942A Expired - Lifetime US1645526A (en) | 1925-03-30 | 1926-03-24 | High-frequency electric furnace |
Country Status (1)
Country | Link |
---|---|
US (1) | US1645526A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2517098A (en) * | 1947-11-10 | 1950-08-01 | Asea Ab | Induction furnace |
US3875322A (en) * | 1973-01-31 | 1975-04-01 | Asea Ab | Electric induction furnace hearth for containing metal melt |
FR2751738A1 (en) * | 1996-07-25 | 1998-01-30 | Commissariat Energie Atomique | DIRECT INDUCTION MELTING OVEN IN COLD CRUCIBLE |
WO2021038163A1 (en) | 2019-08-30 | 2021-03-04 | Commissariat A L'energie Atomique Et Aux Energies Alternatives | Induction furnace comprising an additional resonant circuit |
-
1926
- 1926-03-24 US US96942A patent/US1645526A/en not_active Expired - Lifetime
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2517098A (en) * | 1947-11-10 | 1950-08-01 | Asea Ab | Induction furnace |
US3875322A (en) * | 1973-01-31 | 1975-04-01 | Asea Ab | Electric induction furnace hearth for containing metal melt |
FR2751738A1 (en) * | 1996-07-25 | 1998-01-30 | Commissariat Energie Atomique | DIRECT INDUCTION MELTING OVEN IN COLD CRUCIBLE |
WO1998005185A1 (en) * | 1996-07-25 | 1998-02-05 | Commissariat A L'energie Atomique | Glass induction melting furnace using a cold crucible |
US6185243B1 (en) | 1996-07-25 | 2001-02-06 | Commissariat A L'energie Atomique | Glass induction melting furnace using a cold crucible |
WO2021038163A1 (en) | 2019-08-30 | 2021-03-04 | Commissariat A L'energie Atomique Et Aux Energies Alternatives | Induction furnace comprising an additional resonant circuit |
FR3100421A1 (en) | 2019-08-30 | 2021-03-05 | Commissariat A L'energie Atomique Et Aux Energies Alternatives | Induction furnace including an additional resonant circuit |
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