US2513082A - Induction stirrer - Google Patents
Induction stirrer Download PDFInfo
- Publication number
- US2513082A US2513082A US629458A US62945845A US2513082A US 2513082 A US2513082 A US 2513082A US 629458 A US629458 A US 629458A US 62945845 A US62945845 A US 62945845A US 2513082 A US2513082 A US 2513082A
- Authority
- US
- United States
- Prior art keywords
- shell
- furnace
- winding
- magnetic
- induction stirrer
- 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
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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
- 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 stirring winding should preferably be arranged in slots in a separate shell of magnetic material, said shell being preferably laminated, although with considerably thicker sheet iron than in usuallaminations. for instance with a thickness of about l centimeter or more.
- a form of the invention is illustrated in the accompanying drawing in a plan view with the furnace body removed in Fig. 1 and in a side view with part of the furnace body in section ,in Fig. 2.
- I represents the masonry of the furnace body, and 2 a shell serving to reinforce the said masonry at its periphery.
- the said shell has, at the bottom, a continuation 9 of non-magnetic sheet iron, with which .it may be connected bv a welded joint I 0. Beneath the bottom shell 9.
- Some of the plates forming the laminated shell may have a larger height (at 6) than is required for magnetic reasons, in order to constitute a mechanically rigid construction. 'Ihe same plates or other strengthening structures may be directly secured to the shell 2 at one end at l and connected thereto by links 8 at the other end, in order to permit a mutually different heat expansion.
- a masonry hearth adapted to hold a liquid charge, a multiphase winding mounted below said hearth, means for feeding said winding by a, multiphase current having a frequency of the order of one cycle per second at most, and a continuous protective sheet metal shell of non-magnetic metal of high electric resistivity between said winding and said hearth, said shell reinforcing said hearth and protecting said winding against heat damage resulting from damage to said hearth.
- a shell of magnetic material below said first shell having thick laminations and provided with slots therein, said windings being mounted in said slots.
Description
Jam@ 2% E95@ L. DREYFUS INDUCTION STIRRER Filed Nov. 19, 191:5
Patented June 27, 1950 INDUCTION STIRRER Ludwig Dreyfus, Vastera Allmanna Yasteras, Sweden,
S, Svenska Elektriska Aktiebolaget,
a corporation of Sweden Sweden, assigner to Application November 19, 1945, Serial No. 629,458 In Sweden November 30, 1944Y It is known to provide metallurgical furnaces, especially electric arc furnaces, with a multiphase electrical winding beneath the bottom of the furnace hearth, said winding being fed by low frequency alternating currents and serving to produce, by induction, a motion of the molten contents of the furnace around a, horizontal axis. Such a winding has heretofore been arranged between the masonry of the furnace and the sheet metal shell serving to support and reinforce the said masonry, the said shell consisting of magnetic iron and serving as a return path or yoke for the magnetic flux penetrating the molten furnace contents. While such a construction is quite satisfactory in electromagnetic respect, it has been found to have the disadvantage, that if the masonry should be damaged vin some way by heat or chemical action or otherwise, there is a risk of the winding being damaged by heat action.
It has now been found, that in using such low frequencies of the alternating current which are suitable for the stirring of the bath, and which in large furnaces should be about one cycle per second or less, and in manufacturing the shell V44supporting the furnace, or at least the bottom of said shell, of nonmagnetic material having a high electric resistivity, for instance of non-magnetic sheet iron, it is possible to place the stirring winding outside, i. e. beneath, the supporting shell bottom and still to induce sufficiently strong eddy currents in the bath to obtain the desired stirring action, without inducing so strong currents in the shell as to cause a non-permissible heating thereof or an appreciable loss of power therein. Because of the non-magnetic nature of the shell it forms no return path for the flux from the windings and therefore does not divert this flux from the contents of the furnace. A metallurgical furnace. especially an electric arc furnace, provided with a stirring winding arranged in this manner. forms the object of the present invention. The stirring winding should preferably be arranged in slots in a separate shell of magnetic material, said shell being preferably laminated, although with considerably thicker sheet iron than in usuallaminations. for instance with a thickness of about l centimeter or more.
A form of the invention is illustrated in the accompanying drawing in a plan view with the furnace body removed in Fig. 1 and in a side view with part of the furnace body in section ,in Fig. 2.
I represents the masonry of the furnace body, and 2 a shell serving to reinforce the said masonry at its periphery. The said shell has, at the bottom, a continuation 9 of non-magnetic sheet iron, with which .it may be connected bv a welded joint I 0. Beneath the bottom shell 9.
there is placed a, laminated shell of magnetic iron 3 with slots open upwards containing Number Name Date 1,078,619 Greene Nov. 18, 1913- l,479,582 Brayton Jan. 1, 1924 1,795,842 Davis Mar. 10, 1931 1,801,790 Breisky et al. Apr. 21, 1931 1,801,791 Breisky et a1 Apr. 21, 1931 1.823,970 Davis Sept. 22, 1931 1,851,984 Rennerfelt Apr. 5, 1932 1,862,293 Brace June 7, 1932 2,059,300 Adams Nov. 3, 1936 2,073,597 Northrup Mar. 9, 1937 2,198,304 Cornelius Apr. 23, 1940 2,256,518 Dreyfus Sept. 23, 1941 2,317,597 Ford et al Apr. 27, 1943 2,363,582 Gerber et al. Nov. 28, 1944 FOREIGN PATENTS l Number Country Date 353,523 Italy Oct. 20, 1937 499,437 Great Britain Jan. 24, 1939 523,785 Great Britain July 23, 1940 541,023 Great Britain Nov. 10, 1941 71,797 Norway Mar. 10, 1947 3 Claims. (Cl. 13 -26) a two-phase winding, which consists of acentral coil 4 fed by current lateral coils 5 fed by current of another phase, preferably with a phase diil'erence of 90.
Some of the plates forming the laminated shell may have a larger height (at 6) than is required for magnetic reasons, in order to constitute a mechanically rigid construction. 'Ihe same plates or other strengthening structures may be directly secured to the shell 2 at one end at l and connected thereto by links 8 at the other end, in order to permit a mutually different heat expansion.
I claim as my invention:
l. In a metallurgical furnace, a masonry hearth adapted to hold a liquid charge, a multiphase winding mounted below said hearth, means for feeding said winding by a, multiphase current having a frequency of the order of one cycle per second at most, and a continuous protective sheet metal shell of non-magnetic metal of high electric resistivity between said winding and said hearth, said shell reinforcing said hearth and protecting said winding against heat damage resulting from damage to said hearth.
2. In a furnace as claimed in claim 1, a shell of magnetic material below said first shell having thick laminations and provided with slots therein, said windings being mounted in said slots.
3. In a furnace as claimed in claim 2, expansion joints connecting said shells. f
LUDWIG DREYFUS.
REFERENCES CITED The following references le of this patent:
UNITED STATES PATENTS of one phase and two` are of record in the
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE902767X | 1944-11-30 | ||
SE2513082X | 1944-11-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
US2513082A true US2513082A (en) | 1950-06-27 |
Family
ID=52260734
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US629458A Expired - Lifetime US2513082A (en) | 1944-11-30 | 1945-11-19 | Induction stirrer |
Country Status (2)
Country | Link |
---|---|
US (1) | US2513082A (en) |
DE (1) | DE902767C (en) |
Cited By (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2620366A (en) * | 1950-12-08 | 1952-12-02 | Asea Ab | Induction stirrer |
US2641452A (en) * | 1949-05-06 | 1953-06-09 | Wagner Otto | Electromagnetic type of mixer |
US2643201A (en) * | 1949-12-24 | 1953-06-23 | Nat Res Corp | Coating method and apparatus therefor |
US2652440A (en) * | 1950-07-18 | 1953-09-15 | Battelle Development Corp | Electric arc melting furnace |
US2652441A (en) * | 1949-07-22 | 1953-09-15 | Asea Ab | Electric melting furnace |
US2665319A (en) * | 1949-05-24 | 1954-01-05 | Asea Ab | Metallurgical furnace having a stirring winding |
US2676011A (en) * | 1950-01-28 | 1954-04-20 | Loftus Engineering Corp | Construction for the tap holes of open-hearth furnaces |
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 |
US2748356A (en) * | 1951-07-26 | 1956-05-29 | Electric Heat Control Company | Electro-convection cooling of transformers and the like |
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 |
US3022059A (en) * | 1958-03-10 | 1962-02-20 | Hoerder Huettenunion Ag | Apparatus for treating metal melts |
US3180633A (en) * | 1962-07-18 | 1965-04-27 | Pennsalt Chemicals Corp | Apparatus for producing ultraclean alloy steels |
US3200185A (en) * | 1962-03-21 | 1965-08-10 | Asea Ab | Electromagnetic stirrer |
US3230073A (en) * | 1962-07-20 | 1966-01-18 | Asea Ab | Process for vacuum degassing with electromagnetic stirring |
US3235243A (en) * | 1963-09-12 | 1966-02-15 | Pennsalt Chemicals Corp | Apparatus for producing ultraclean alloy steels |
US3363044A (en) * | 1965-03-13 | 1968-01-09 | Asea Ab | Channel type induction furnace |
US3396228A (en) * | 1965-08-02 | 1968-08-06 | Asea Ab | Electromagnetic stirrer |
US3452973A (en) * | 1965-12-29 | 1969-07-01 | Nippon Kokan Kk | Vacuum degasifying apparatus with electromagnetic stirring means |
US3671029A (en) * | 1969-06-24 | 1972-06-20 | Asea Ab | Furnace for non-ferrous metals |
US4080663A (en) * | 1976-03-09 | 1978-03-21 | Wik G | Magnetic stirrer |
US4590989A (en) * | 1983-08-17 | 1986-05-27 | Sumitomo Metal Industries, Ltd. | Electromagnetic stirrer |
US6693950B2 (en) * | 2001-05-22 | 2004-02-17 | Inductotherm Corp. | Furnace with bottom induction coil |
WO2018145754A1 (en) | 2017-02-10 | 2018-08-16 | Abb Schweiz Ag | Furnace assembly for a metal-making process |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1235507B (en) * | 1962-04-12 | 1967-03-02 | Asea Ab | Gas or air-cooled electromagnetic agitator |
SE389877B (en) * | 1973-01-23 | 1976-11-22 | Asea Ab | METHOD AND DEVICE FOR THE MANUFACTURE OF A CARBONED METAL MELT BY MELT REDUCTION WITH THE EXCEPTION OF WHAT IS PROTECTED UNDER PATENT 7205211-1 |
FR2358773A1 (en) * | 1976-07-12 | 1978-02-10 | Siderurgie Fse Inst Rech | IMPROVEMENTS TO SLIDING FIELD ELECTROMAGNETIC INDUCERS |
Citations (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1078619A (en) * | 1911-01-23 | 1913-11-18 | Albert E Greene | Electric furnace. |
US1479582A (en) * | 1920-09-24 | 1924-01-01 | Induction Furnace Company | Induction furnace |
US1795842A (en) * | 1929-01-08 | 1931-03-10 | Westinghouse Electric & Mfg Co | Induction furnace |
US1801790A (en) * | 1930-03-05 | 1931-04-21 | Westinghouse Electric & Mfg Co | Induction furnace |
US1801791A (en) * | 1930-03-05 | 1931-04-21 | Westinghouse Electric & Mfg Co | Induction-furnace protective circuits |
US1823970A (en) * | 1928-10-09 | 1931-09-22 | Westinghouse Electric & Mfg Co | Induction furnace |
US1851984A (en) * | 1926-07-03 | 1932-04-05 | Rennerfelt Ivar | Electric furnace |
US1862293A (en) * | 1931-01-06 | 1932-06-07 | Westinghouse Electric & Mfg Co | Induction furnace |
US2059300A (en) * | 1932-09-09 | 1936-11-03 | Youngstown Sheet And Tube Co | Apparatus for the formation of articles by welding |
US2073597A (en) * | 1930-05-22 | 1937-03-09 | Ajax Electrothermic Corp | Induction electric furnace |
GB499437A (en) * | 1937-01-22 | 1939-01-24 | Asea Ab | Improvements in or relating to furnaces for metallurgical purposes |
US2198304A (en) * | 1936-09-26 | 1940-04-23 | Crown Cork & Seal Co | Method and apparatus for circulating glass |
GB523785A (en) * | 1938-03-30 | 1940-07-23 | Kjell Magnus Tigerschiold | Improvements relating to metallurgical apparatus operated by electrical induction |
US2256518A (en) * | 1938-10-03 | 1941-09-23 | Asea Ab | Electric furnace |
GB541023A (en) * | 1940-05-09 | 1941-11-10 | Manuel Tama | Improvements in and relating to induction furnaces |
US2317597A (en) * | 1940-07-17 | 1943-04-27 | Ford Motor Co | Die construction |
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 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE307225C (en) * | ||||
US1487275A (en) * | 1920-12-27 | 1924-03-18 | Gen Electric | Electrometallurgy |
-
1945
- 1945-11-19 US US629458A patent/US2513082A/en not_active Expired - Lifetime
- 1945-11-30 DE DEST362D patent/DE902767C/en not_active Expired
Patent Citations (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1078619A (en) * | 1911-01-23 | 1913-11-18 | Albert E Greene | Electric furnace. |
US1479582A (en) * | 1920-09-24 | 1924-01-01 | Induction Furnace Company | Induction furnace |
US1851984A (en) * | 1926-07-03 | 1932-04-05 | Rennerfelt Ivar | Electric furnace |
US1823970A (en) * | 1928-10-09 | 1931-09-22 | Westinghouse Electric & Mfg Co | Induction furnace |
US1795842A (en) * | 1929-01-08 | 1931-03-10 | Westinghouse Electric & Mfg Co | Induction furnace |
US1801790A (en) * | 1930-03-05 | 1931-04-21 | Westinghouse Electric & Mfg Co | Induction furnace |
US1801791A (en) * | 1930-03-05 | 1931-04-21 | Westinghouse Electric & Mfg Co | Induction-furnace protective circuits |
US2073597A (en) * | 1930-05-22 | 1937-03-09 | Ajax Electrothermic Corp | Induction electric furnace |
US1862293A (en) * | 1931-01-06 | 1932-06-07 | Westinghouse Electric & Mfg Co | Induction furnace |
US2059300A (en) * | 1932-09-09 | 1936-11-03 | Youngstown Sheet And Tube Co | Apparatus for the formation of articles by welding |
US2198304A (en) * | 1936-09-26 | 1940-04-23 | Crown Cork & Seal Co | Method and apparatus for circulating glass |
GB499437A (en) * | 1937-01-22 | 1939-01-24 | Asea Ab | Improvements in or relating to furnaces for metallurgical purposes |
GB523785A (en) * | 1938-03-30 | 1940-07-23 | Kjell Magnus Tigerschiold | Improvements relating to metallurgical apparatus operated by electrical induction |
US2256518A (en) * | 1938-10-03 | 1941-09-23 | Asea Ab | Electric furnace |
GB541023A (en) * | 1940-05-09 | 1941-11-10 | Manuel Tama | Improvements in and relating to induction furnaces |
US2317597A (en) * | 1940-07-17 | 1943-04-27 | Ford Motor Co | Die construction |
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 |
Cited By (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2641452A (en) * | 1949-05-06 | 1953-06-09 | Wagner Otto | Electromagnetic type of mixer |
US2665319A (en) * | 1949-05-24 | 1954-01-05 | Asea Ab | Metallurgical furnace having a stirring winding |
US2652441A (en) * | 1949-07-22 | 1953-09-15 | Asea Ab | Electric melting furnace |
US2643201A (en) * | 1949-12-24 | 1953-06-23 | Nat Res Corp | Coating method and apparatus therefor |
US2676011A (en) * | 1950-01-28 | 1954-04-20 | Loftus Engineering Corp | Construction for the tap holes of open-hearth furnaces |
US2652440A (en) * | 1950-07-18 | 1953-09-15 | Battelle Development Corp | Electric arc melting furnace |
US2620366A (en) * | 1950-12-08 | 1952-12-02 | Asea Ab | Induction stirrer |
US2748356A (en) * | 1951-07-26 | 1956-05-29 | Electric Heat Control Company | Electro-convection cooling of transformers and the like |
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 |
US3022059A (en) * | 1958-03-10 | 1962-02-20 | Hoerder Huettenunion Ag | Apparatus for treating metal melts |
US3200185A (en) * | 1962-03-21 | 1965-08-10 | Asea Ab | Electromagnetic stirrer |
US3180633A (en) * | 1962-07-18 | 1965-04-27 | Pennsalt Chemicals Corp | Apparatus for producing ultraclean alloy steels |
US3230073A (en) * | 1962-07-20 | 1966-01-18 | Asea Ab | Process for vacuum degassing with electromagnetic stirring |
US3235243A (en) * | 1963-09-12 | 1966-02-15 | Pennsalt Chemicals Corp | Apparatus for producing ultraclean alloy steels |
US3363044A (en) * | 1965-03-13 | 1968-01-09 | Asea Ab | Channel type induction furnace |
US3396228A (en) * | 1965-08-02 | 1968-08-06 | Asea Ab | Electromagnetic stirrer |
US3452973A (en) * | 1965-12-29 | 1969-07-01 | Nippon Kokan Kk | Vacuum degasifying apparatus with electromagnetic stirring means |
US3671029A (en) * | 1969-06-24 | 1972-06-20 | Asea Ab | Furnace for non-ferrous metals |
US4080663A (en) * | 1976-03-09 | 1978-03-21 | Wik G | Magnetic stirrer |
US4590989A (en) * | 1983-08-17 | 1986-05-27 | Sumitomo Metal Industries, Ltd. | Electromagnetic stirrer |
US6693950B2 (en) * | 2001-05-22 | 2004-02-17 | Inductotherm Corp. | Furnace with bottom induction coil |
WO2018145754A1 (en) | 2017-02-10 | 2018-08-16 | Abb Schweiz Ag | Furnace assembly for a metal-making process |
Also Published As
Publication number | Publication date |
---|---|
DE902767C (en) | 1954-01-28 |
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