US3363044A - Channel type induction furnace - Google Patents

Channel type induction furnace Download PDF

Info

Publication number
US3363044A
US3363044A US452699A US45269965A US3363044A US 3363044 A US3363044 A US 3363044A US 452699 A US452699 A US 452699A US 45269965 A US45269965 A US 45269965A US 3363044 A US3363044 A US 3363044A
Authority
US
United States
Prior art keywords
channel
stirrer
channels
hearth
inductor unit
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
US452699A
Other languages
English (en)
Inventor
Beckius Ivar
Fredriksson Bengt
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
Application filed by ASEA AB filed Critical ASEA AB
Application granted granted Critical
Publication of US3363044A publication Critical patent/US3363044A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • H05B6/16—Furnaces having endless cores
    • H05B6/20—Furnaces having endless cores having melting channel only

Definitions

  • the invention refers to a channel type induction furnace with at least one inductor unit containing at least one coil, an iron core and at least one channel going round the coil of the ordinary type with two lateral channels debouching in the hearth and a bottom channel which con# nects the lateral channels.
  • the invention is characterised in that at least one electromagnetic stirrer is placed on ⁇ the outside of the inductor unit.
  • a particularly preferable embodiment is constituted by an inductor unit with two coils and double channels with a common central channel and each having its own lateral channel, a bottom channel connecting the central and lateral channels, and one or two iron cores passing through the coil or coils.
  • the embodiment is characterised in that near the bottom channel is arranged at least one stirrer and/ or at least one stirrer near one or both lateral channels or near the central channel.
  • the obstacles can easily be overcome which normally prevent unidirectional flow in the channels.
  • a direction can be produced from the -hearth into the central channel, towards the hearth in the lateral channels or vice versa or also from the hearth in one and towards the hearth in the other lateral channel.
  • diiierent current directions can also be made quickly with the object of preventing overheating in the channels and of making the heating of the melt effective and at the same time also producing stirring in the hearth, useful for the metallurgical process.
  • stirring can also be produced without current in the heating coils, for example for cleansing the channels or for effecting certain metallurgical processes in the hearth.
  • FIGS. l and 2 show two side views of a single channel inductor with a stirrer and FIGS. 3 and 4 a corresponding view of a double channel inductor.
  • FIG. 5 shows an alternative stirred positioning and FIG. 6 a special channel formation.
  • FIGS. l and 2 a melt space 1 or a furnace hearth is shown, to which one or several channel inductors are connected, here a single channel inductor with two lateral channels a bottom channel, together forming a channel 2 communicating with the hearth 1.
  • the stirrer is either placed below the bottom channel (at 7) or near one or both the lateral channels 6, 8 or also near all three channels.
  • the stirrer 6, 7, 3 can be plane wound, constructed in principle as the stator of an asynchronous machine, or coil wound, and in both cases provided with water or air cooling.
  • the arrows in the different channels in FIG. l show one stirring direction of the melt in the channel, but the stirring direction can of course be altered to the opposite direction or alternate between two directions.
  • the stirrer can of course also be fed ⁇ with extra low frequency (0.4-10 cycles per second) (multiphase) with the object of effecting motoric stirring.
  • the inductor unit can also be made to be exchangeable, for example according to Patent No. 3,100,237.
  • FIGS. 3-4 a double channel type inductor is shown, which is placed in a furnace body 10, enclosing the melt space (the hearth) 9.
  • the inductor unit is of double channel type and is provided with twin coils 11, 12, one or two phase fed and placed on one or two (see FIG. 3) iron cores 13, 14.
  • the channels consist of a common central channel 15 and two lateral channels 16, 17 and one bottom channel 18 connecting these three channels.
  • the shape of the channel is made like an w, but it can ofcourse also be made as a double rectangle.
  • the central -channel 15 is shaped with an upwardly enlarged cross section and all corners of the bottom channel 18 are rounded in order to allow high speed flow of the melt.
  • the central channel 15 can also be made with constant cross section.
  • stirrer 20 21 is placed of considerable length on both sides of the symmetrical plane of the inductor unit, possibly also completely or partly extending beyond the sides of the inductor (see dashed lines).
  • the stirrer can be a single stirrer or can be divided into two parts 20, 21 or several parts, divided at the symmetrical plane or divided into several sections with reversible stirring directions not dependent on each other.
  • the inductor unit can alternatively be provided with one, two or several stirrers 22, 23, placed at the sides of the inductor, or also combined with parts 20, 21.
  • the inductor unit can be provided with one or two stirrers 24', 25', for the central channel 15, which can be seen schematically by FIG.
  • the inductor unit is surrounded by a shield 24, consisting of one or several plates or a non-ferromagnetic rnaterial which is also a good electrical conductor, :such as copper or aluminium.
  • the shield 24 extends along the wall of the inductor unit but outside the stirrer 20, 21 in the longitudinal (FIG. 3) as well as in the transverse direction (FIG. 4), but inside the magnetic casing of the inductive stirrer.
  • the advantage of this is that the main flux from the coils 11, 12 and the leak flux from the cores 13, 14 do not give any damaging influence to the stirrer. No losses emanating Ifrom these fluxes or damaging effects on the working of the stirrer worth mentioning are produced.
  • the shield 24 preferably also extends along the sides of the inductor in order to prevent the losses which may arise in the magnetic material.
  • leak flux laminations 27 are arranged so that the leak flux can be conducted Ipast the stirrer and directly to the iron core 13, 14 concentrated as near to the coils 11, 12 as possible. This leak flux has been substantially concentrated around the'coils 11, 12 (see FIG. 4).
  • the inductor unit according to FIGS. 3 and 4 isV also exchangeable during operation, for example shaped according to the above mentioned patent.
  • the inductor unit is usually provided with water cooling, see the tube 25 in FIGS. 3 and 4.
  • the cooling tube also serves for cooling of the inductor. See 26.
  • the stirring direction in the stirrer according to FIG. 3 can be used in the following way:
  • Direction II gives the opposite flow direction.
  • Direction III i.e. the same direction in 20 and 21 gives downward flow in the left lateral channel 16 and right-hand direction in the bottom channel 18, and upward flow in the right-hand lateral channel 17.
  • Direction IV gives the opposite ow direction.
  • the condition in the central channel in alternatives III and IV is that only an insignificant flow is produced in this central channel, predominantly upward directed.
  • FIG. 6 a channel type embodiment with a large cross section in the central channel 29 and smaller sections in the lateral channels 28 and 30 is shown.
  • the two stirrers 31 and 32 when positioned according to this figure will operate as if each of them were influencing a single channel.
  • inductors In the furnace body 10 a large number of inductors can be placed with different inclinations relative to the vertical plane through the longitudinal axis of the furnace. All these or certain of them can be provided with stirrers according to the above. Other variations can also be feasible within the scope of the following claims.
  • submerged resistor type induction furnace with a hearth and at least one inductor unit comprising at least 9.11.6 Coil With an iron yoke and at least one melt loop around the coil, said loop having at least two lateral channels running from the hearth and at least one bottom channel connecting said lateral channels, at least one electromagnetic stirrer positioned on the outside of the Vinductor unit, said stirrer being separate from said coil.
  • Submerged resistor type induction furnace with at least one inductor unit comprising at least two coils, at least one iron yoke threading said coils, melting loops encircling said coils, each of said loops having a lateral channel, and having a central, common channel extending between said coils and a bottom channel connecting the lower ends of the lateral channels and the lower end of the bottom channel, said central and lateral channels extending from the bottom channel to the hearth, at least one stirrer positioned on the outside of said inductor unit and below the bottom channel being placed, said stirrer extending at both sides of a plane through the central axis of said central channel, said stirrer bein-g separate from said coil.
  • Furnace in accordance with claim 4 in which a laminated core with axial extensions for concentration of the flux is provided around the heating coils.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Crucibles And Fluidized-Bed Furnaces (AREA)
  • Furnace Details (AREA)
US452699A 1965-03-13 1965-05-03 Channel type induction furnace Expired - Lifetime US3363044A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE3309/65A SE316548B (enrdf_load_html_response) 1965-03-13 1965-03-13

Publications (1)

Publication Number Publication Date
US3363044A true US3363044A (en) 1968-01-09

Family

ID=20261834

Family Applications (1)

Application Number Title Priority Date Filing Date
US452699A Expired - Lifetime US3363044A (en) 1965-03-13 1965-05-03 Channel type induction furnace

Country Status (2)

Country Link
US (1) US3363044A (enrdf_load_html_response)
SE (1) SE316548B (enrdf_load_html_response)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3478157A (en) * 1967-11-20 1969-11-11 Whiting Corp Inductor mounting means for an induction furnace
EP0490264A1 (de) * 1990-12-11 1992-06-17 ABBPATENT GmbH Rinneninduktor mit äusserem metallenen Gehäuse

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2513082A (en) * 1944-11-30 1950-06-27 Asea Ab Induction stirrer
US2536859A (en) * 1946-05-23 1951-01-02 Ajax Engineering Corp Method and device for pumping molten metals
US2573319A (en) * 1948-11-08 1951-10-30 Asea Ab Inductive stirring
US2620366A (en) * 1950-12-08 1952-12-02 Asea Ab Induction stirrer
US2652441A (en) * 1949-07-22 1953-09-15 Asea Ab Electric melting furnace
US2960556A (en) * 1957-04-03 1960-11-15 Asea Ab Electric stirring winding
US2993943A (en) * 1957-10-28 1961-07-25 Cooke Norman Low frequency electric induction furnaces
US3100237A (en) * 1960-05-21 1963-08-06 Asea Ab Low frequency induction furnace of the melting channel type
US3200185A (en) * 1962-03-21 1965-08-10 Asea Ab Electromagnetic stirrer
US3297811A (en) * 1963-01-18 1967-01-10 Aeg Cooling system

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2513082A (en) * 1944-11-30 1950-06-27 Asea Ab Induction stirrer
US2536859A (en) * 1946-05-23 1951-01-02 Ajax Engineering Corp Method and device for pumping molten metals
US2573319A (en) * 1948-11-08 1951-10-30 Asea Ab Inductive stirring
US2652441A (en) * 1949-07-22 1953-09-15 Asea Ab Electric melting furnace
US2620366A (en) * 1950-12-08 1952-12-02 Asea Ab Induction stirrer
US2960556A (en) * 1957-04-03 1960-11-15 Asea Ab Electric stirring winding
US2993943A (en) * 1957-10-28 1961-07-25 Cooke Norman Low frequency electric induction furnaces
US3100237A (en) * 1960-05-21 1963-08-06 Asea Ab Low frequency induction furnace of the melting channel type
US3200185A (en) * 1962-03-21 1965-08-10 Asea Ab Electromagnetic stirrer
US3297811A (en) * 1963-01-18 1967-01-10 Aeg Cooling system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3478157A (en) * 1967-11-20 1969-11-11 Whiting Corp Inductor mounting means for an induction furnace
EP0490264A1 (de) * 1990-12-11 1992-06-17 ABBPATENT GmbH Rinneninduktor mit äusserem metallenen Gehäuse

Also Published As

Publication number Publication date
SE316548B (enrdf_load_html_response) 1969-10-27

Similar Documents

Publication Publication Date Title
US2513082A (en) Induction stirrer
EP1718910B1 (en) Cold crucible induction furnace with eddy current damping
JP2641140B2 (ja) くず鉄の溶融方法及びこの方法を実施するための電気炉
US2363582A (en) Method of and means for stirring or circulating molten or liquid materials or mediums
KR20130028712A (ko) 연속 슬래브 주조 장치를 위한 교반 롤러
US2541841A (en) Unidirectional flow in plurality chamber induction furnace
US4749026A (en) Device for stirring molten metal in a continuous casting plant
US3363044A (en) Channel type induction furnace
US11612931B2 (en) Electromagnetic stirring device in a mould for casting aluminium or aluminium alloys, stirring method in a mould for casting aluminium or aluminium alloys, mould and casting machine for casting aluminium or aluminium alloys
US3335212A (en) Induction melting furnace
US3320348A (en) Induction melting furnace
US2539215A (en) Electric furnace, including electromagnetic pump for molten metal
IE51298B1 (en) Electromagnetic stirring of molten metal in a casting mould
US2970830A (en) Varying the falling speed of a stream of molten metal
US2711436A (en) Fluid material container with inclined slotted bottom having inductive stirring device adjacent thereto for an electric furnace
USRE24462E (en) Dreyfus
US4487401A (en) Device for heating, mixing and/or transferring metals in the liquid state
US3595979A (en) Induction furnaces
EP0086637B1 (en) Treatment of molten materials
US1775351A (en) Induction furnace
US2363994A (en) Electric induction furnace
US2968685A (en) Apparatus for electro-magnetic stirring
US1811644A (en) Edwin fitch northrup
US2499540A (en) Method of treating metals in induction furnaces
KR100243642B1 (ko) 무심 유도로를 가진 도금장치