EP0106792A2 - Agencement de four pour fondre et chauffer du métal - Google Patents

Agencement de four pour fondre et chauffer du métal Download PDF

Info

Publication number
EP0106792A2
EP0106792A2 EP83710070A EP83710070A EP0106792A2 EP 0106792 A2 EP0106792 A2 EP 0106792A2 EP 83710070 A EP83710070 A EP 83710070A EP 83710070 A EP83710070 A EP 83710070A EP 0106792 A2 EP0106792 A2 EP 0106792A2
Authority
EP
European Patent Office
Prior art keywords
furnace
chamber
inductor
arrangement according
channels
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.)
Granted
Application number
EP83710070A
Other languages
German (de)
English (en)
Other versions
EP0106792B1 (fr
EP0106792A3 (en
Inventor
Lars Halén
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 claimed from SE8205898A external-priority patent/SE437726B/sv
Priority claimed from SE8303419A external-priority patent/SE8303419L/xx
Application filed by ASEA AB filed Critical ASEA AB
Priority to AT83710070T priority Critical patent/ATE34833T1/de
Publication of EP0106792A2 publication Critical patent/EP0106792A2/fr
Publication of EP0106792A3 publication Critical patent/EP0106792A3/de
Application granted granted Critical
Publication of EP0106792B1 publication Critical patent/EP0106792B1/fr
Expired 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 relates to a furnace arrangement for melting and keeping metal warm according to the preamble of claim 1.
  • a furnace arrangement is known from DE- AS 2 007 081.
  • furnace assemblies of the type mentioned there is a desire to keep the metal in the furnace chamber - usually aluminum or an aluminum alloy - in the molten state over long time intervals, for example over several hours or days, during which time no further melting or supply takes place of metal takes place.
  • the invention has for its object to develop a furnace arrangement of the type mentioned at a low cost such that the inductor can be easily installed and removed and the contraction distance in the inductor is small. Furthermore, it should be possible, while maintaining the inductor, which is very advantageous for melting, for keeping the melt warm with a low output get.
  • furnace inductors have a shell made of metallic material, the inductor being connected to a furnace vessel by flanging said shell onto the furnace vessel.
  • the inductor used in the present invention according to a further development of the invention does not have such a sheath, as a result of which eddy current losses which otherwise occur are avoided.
  • said ceramic body is made as a self-supporting block from a material that can withstand relatively high compressive stresses, the inductor being connected to the furnace vessel in such a way that said stone is clamped between two furnace vessels.
  • This construction according to the invention allows quick assembly and disassembly of the inductor. This is very advantageous since inductors for trough furnaces are at relatively short intervals, e.g. annually.
  • the term “contraction distance” is generally understood to mean a channel section present in the inductor, along which a body of solidified metal forms when the furnace heating is switched off. As it cools further, this body tears easily because its contraction is somewhat prevented by the canal. This cracking often has the result that the electrical secondary circuit of the inductor is interrupted.
  • the ver in the invention turned inductor has the advantage that its contraction distance is shorter than in known inductors, which results from the fact that the channels of the inductor are open to two furnace chambers. This reduces the length of the contraction section to about a third compared to a conventional inductor.
  • said first and / or second chamber also contains a heat source arranged above the melt, which can be activated even when the inductor is switched off and whose maximum power is smaller than the maximum power of the inductor, but is sufficient to achieve the Keep molten metal in a liquid state for at least 24 hours.
  • a heat source arranged above the melt, which can be activated even when the inductor is switched off and whose maximum power is smaller than the maximum power of the inductor, but is sufficient to achieve the Keep molten metal in a liquid state for at least 24 hours.
  • the number of channels arranged between the two furnace chambers is at least 4, preferably at least 6, divided. in 2 or 3 pairs, each pair (together with paths in the furnace chambers) enclosing a primary coil (13 ', 13 ", 13"'), which sits on the leg of a transformox core.
  • Each primary coil is fed by a phase of a two-phase or multi-phase electrical voltage system.
  • This expansion of the furnace arrangement according to the invention to a two-phase or multi-phase furnace arrangement results in a substantially larger furnace capacity and a high degree of efficiency.
  • the achievable increase in efficiency can be 10 or more percent.
  • a phase can also be switched off and a warming effect can be achieved.
  • there is an asymmetrical load on the electrical network but this can be avoided by means of compensation arrangements.
  • the inductors provided between the two furnace vessels can consist of a modular system of one or more identical inductor units, so that by combining several such inductor units that are identical to one another, furnace arrangements with different melting capacities can be built up be arranged in both furnace vessels.
  • FIGS 1 to 4 show a furnace arrangement which contains two furnace vessels 1 and 1 'which are identical to one another with the exception that the furnace vessel 1 has a filling opening 2 for molten metal, while at the corresponding location of the furnace vessel 1' a corresponding opening is closed or does not exist.
  • Each furnace vessel 1 and 1 ' has a vessel 3 or 3' made of sheet steel, which is lined with a lining 4 or 4 'made of ceramic material and contains an oven chamber 5 or 5'.
  • a furnace inductor 6 is arranged between the two furnace vessels 1 and 1 '.
  • the furnace inductor 6 contains an inductor block 7 which is constructed as a single stone consisting of ceramic material.
  • the inductor block 7 is essentially designed as a parallelepiped block with three through channels (holes) 8, 9 and 15. Two of these channels, 8 and 9, are horizontal, essentially straight and mutually parallel inductor channels. Each inductor channel 8 and 9 forms a hydraulic connection between the two furnace chambers 5 and 5 ', which takes place via two preferably widening openings 10 and 10' in the two furnace vessels 1 and 1 '.
  • the continuous channel 15 has an essentially circular cross section, the cylinder axis 15 ′ running vertically.
  • the channel 15 is arranged between the two horizontal inductor channels 8 and 9, and in its longitudinal direction extends one leg 11 of the transformer core 12 and the primary winding 13 sitting on the leg 11.
  • the inductor block 7 is provided with a layer 14 of heat-insulating material, for example ceramic Felt, which reduces the heat flow from the inductor to the surrounding air.
  • the inductor block 7 rests on a profile carrier 16 arranged on the outside of each furnace vessel and is fixed in its correct position with the aid of a pair of upper tie rods 17 and a pair of lower tie rods 18.
  • the pull rods 17 and 18 are inserted at the ends into carrying eyes 19 attached to the furnace vessels 5 and 5 ′ and provided with nuts 20.
  • the nuts 20 are tightened where at the contact surfaces 21 of the inductor block 7 are pressed with such great force against corresponding surfaces of the furnace vessels 5 and 5 'that a pressure-tight connection between the openings 10 and 10' and the inductor channels 8 and 9 is formed. Thanks to the arrangement and fixation described above
  • the furnace inductor 6 can be assembled and disassembled in a very labor and time-saving manner. When dismantling, for example, only four of the nuts 20 need to be loosened somewhat, whereupon the inductor 6 can be lifted straight up and continued by means of a horizontal movement.
  • Each furnace vessel 1, .1 ' is provided with a lid 22 or 22', which consists of a metal tin box, which contains a lining made of heat-resistant and heat-insulating material.
  • Each cover is provided with a heat source in the form of an electrical heating resistor 23 or 23 ', which is connected via an electrical switch, not shown, to an AC power source, not shown, so that it can be switched on or off independently of the power supply to the inductor.
  • Each of the two heating resistors 23 and 23 ′ has a maximum output which is less than 15%, preferably less than 5%, of the maximum output of the inductor 6.
  • the combined power of these two heating resistors 23, 23 are sufficient to keep the melt in the liquid state for several hours, preferably several days, when the inductor is switched off.
  • the maximum power of the inductor 6 is such that the inductor alone is able to supply the energy required for the melting. However, this can be increased further in that at least one of the heating elements 23, 23 'is switched on simultaneously with the inductor.
  • the level of the molten metal is so high that the molten metal that is in the two furnaces chambers 5, 5 ', located in the two openings 10, 10' and in the two inductor channels 8 and 9, forms an electrical secondary circuit surrounding the transformer leg 11 (secondary winding with one turn).
  • Charging is done in such a way that the material to be melted, e.g. Aluminum, magnesium or alloys containing these metals or some of them are fed to the open chamber 5 'when the cover 22' is in the position shown in broken lines in FIG.
  • the melt reaches the filling point 2
  • molten metal flows out of the filling opening when further charging.
  • the furnace arrangement shown in FIGS. 1 to 4 is expediently used together with a special, not shown, known holding furnace, the furnace chamber volume of which is at least twice as large, preferably at least five times as large as the volume of the furnace chamber 5.
  • the filling opening 2 is expediently provided with a pouring spout, with the aid of which molten metal flowing out is fed to the special holding furnace mentioned.
  • furnace vessel 1 is replaced by a furnace vessel 25 which is different in size and construction.
  • This has a heat-insulating cover 26, on the underside of which a heating element in the form of an electrical heating resistor 27 is arranged.
  • the furnace vessel 25 has a furnace chamber 28 which is delimited at the top by the cover 26.
  • the furnace chamber 28 is by means of a vertical partition 30 in two side by side, with sub-chambers 29 and 30 which are connected to one another.
  • the only way for melt located in the subchamber 29 to get into the subchamber 30 is to pass an overflow rim 32 on the partition wall 30.
  • Solid aluminum is charged into the furnace chamber 5 '.
  • the figure shows a point in time at which the entire amount of aluminum charged is protected and the furnace chambers 5 and 28 contain only molten metal, which means that the melt level 34 in the partial chamber 29 is at the same level as the melt level 35 in the furnace chamber 5 If charging is continued, molten aluminum flows over the overflow rim 32 into the partial chamber 30, as a result of which the melt level 33 in this chamber rises.
  • the chamber 30 has a filling opening 36 located at the bottom.
  • the partial chamber 30 holds a maximum of at least twice as much, preferably at least three times as much, molten metal as the partial chamber 29.
  • the partial chamber 29 communicates with the inductor channels of the inductor 6 via an opening 31 in the wall of the Furnace vessel 25.
  • the vertical distance between the overflow rim 32 and the cover 26 is preferably less than 40% of the average height of the furnace chamber 28.
  • the inductor 6 is air-cooled by a fan which is driven by a fan motor 37.
  • the electrical heating elements 23, 23 'and 27 can be powered by other types of heat sources, e.g. Gas burner to be replaced.
  • Figure 6 shows a furnace arrangement according to the invention for three-phase feeding.
  • the two furnace vessels 1 , 1 'and the furnace chambers 5, 5 ' are again identical to one another and in principle exact constructed as in the embodiment described with reference to FIGS. 1 to 4, but with the difference that three inductor units are arranged between the two furnace vessels 1, 1 '.
  • an oven arrangement according to the invention can also be implemented for a two-phase supply, in which case two inductors 6 are then arranged between the two oven vessels.
  • FIG. 6 there are three inductors 6 in the three-phase embodiment, each of which is provided with two channels 38, 39 or 40, 41 or 42, 43 running between the chambers 5, 5 ′, which channels 8 and 9 in the correspond to the embodiment described above. (See also Figure 9). Each pair of said channels is used to form the secondary winding consisting of melt for each of the inductors 6, the primary windings with 13; 13 "and 13" 'are designated.
  • the three (or two) inductor blocks 6 are identical to one another and are pulled together by draw bolts 44. Four pull bolts 44 are generally used for this purpose. A layer 46 of ceramic felt is inserted between the inductor blocks. The inductor channels between the two chambers 5, 5 'are also shown in Figure 9 (38-44). The three assembled blocks 6 are placed on a tripod together with the transformer core 12 and the coils 13.
  • the two furnace vessels (the charging part and the drain part) 1 'and 1 are each placed on one side of the inductor blocks and pulled together with the pull rods 17, 18.
  • the contact surfaces 21 for contacting the furnace vessels 1, 1 ' are also shown in FIG. 8.
  • FIG. 10 shows the possibility of building melting furnaces for aluminum, for example, with inductor blocks in the modular system and thereby obtaining furnaces with different melting capacities, but using a single size of inductor blocks 45. These blocks 45 can be arranged side by side and / or one behind the other between the two vessels 1, 1 '.
  • Figure 10 shows various power alternatives for 130, 260, 390, 520 and 780 kW.
  • furnace arrangements described above can be varied in many ways within the scope of the general inventive idea disclosed.
  • the furnace arrangement shown in FIGS. 6 to 9 can be designed with regard to the details not shown, just like the furnace arrangement according to FIGS. 1 to 4 or the furnace arrangement according to FIG. 5.
  • the chambers 5 and 5 ' can be of the same size or different sizes, the first chamber 5 can be larger than the second chamber 5' or vice versa.
  • the size ratio can be 2: 1.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Furnace Details (AREA)
EP83710070A 1982-10-18 1983-10-07 Agencement de four pour fondre et chauffer du métal Expired EP0106792B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83710070T ATE34833T1 (de) 1982-10-18 1983-10-07 Ofenanordnung zum schmelzen und warmhalten von metall.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
SE8205898A SE437726B (sv) 1982-10-18 1982-10-18 Ugnsanordning for smeltning och varmhallning av metall
SE8205898 1982-10-18
SE8303419A SE8303419L (sv) 1983-06-15 1983-06-15 Ugnsanordning for smeltning och varmhallning av metall
SE8303419 1983-06-15

Publications (3)

Publication Number Publication Date
EP0106792A2 true EP0106792A2 (fr) 1984-04-25
EP0106792A3 EP0106792A3 (en) 1985-10-09
EP0106792B1 EP0106792B1 (fr) 1988-06-01

Family

ID=26658262

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83710070A Expired EP0106792B1 (fr) 1982-10-18 1983-10-07 Agencement de four pour fondre et chauffer du métal

Country Status (7)

Country Link
US (1) US4596020A (fr)
EP (1) EP0106792B1 (fr)
DE (1) DE3376872D1 (fr)
DK (1) DK164376C (fr)
ES (1) ES526477A0 (fr)
FI (1) FI76208C (fr)
NO (1) NO160272C (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4753192A (en) * 1987-01-08 1988-06-28 Btu Engineering Corporation Movable core fast cool-down furnace
AU2002303107A1 (en) * 2002-02-26 2003-09-09 Kenneth D. Clark Metal injection molding furnace heating element adjustment apparatus

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1328713A (en) * 1920-01-20 Xwalter r r
FR614800A (fr) * 1925-04-29 1926-12-22 Four d'induction électrique
FR927035A (fr) * 1945-05-24 1947-10-17 Ajax Engineering Corp Four à induction

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1647787A (en) * 1925-04-29 1927-11-01 Zubiria Jose Ricardo De Electric induction furnace
GB571304A (en) * 1942-10-21 1945-08-20 Manuel Tama Improvements in submerged resistor induction furnaces
US2499540A (en) * 1945-05-24 1950-03-07 Ajax Engineering Corp Method of treating metals in induction furnaces
US2540744A (en) * 1948-10-01 1951-02-06 Lindberg Eng Co Induction furnace
US2641621A (en) * 1950-02-27 1953-06-09 Albert E Greene Electric induction furnace
US2648715A (en) * 1950-06-06 1953-08-11 Lindberg Eng Co Furnace for molten metal
US2674639A (en) * 1952-03-13 1954-04-06 Lindberg Eng Co Method of and a furnace for induction melting metal
US2805271A (en) * 1955-11-14 1957-09-03 Lindberg Eng Co Multiple chamber induction furnace
US2892005A (en) * 1955-11-14 1959-06-23 Lindberg Eng Co Metal melting furnace

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1328713A (en) * 1920-01-20 Xwalter r r
FR614800A (fr) * 1925-04-29 1926-12-22 Four d'induction électrique
FR927035A (fr) * 1945-05-24 1947-10-17 Ajax Engineering Corp Four à induction

Also Published As

Publication number Publication date
EP0106792B1 (fr) 1988-06-01
DK470183D0 (da) 1983-10-12
FI76208C (fi) 1988-09-09
DK164376B (da) 1992-06-15
ES8406707A1 (es) 1984-08-01
NO160272B (no) 1988-12-19
DE3376872D1 (en) 1988-07-07
FI833785A (fi) 1984-04-19
EP0106792A3 (en) 1985-10-09
ES526477A0 (es) 1984-08-01
NO833742L (no) 1984-04-24
DK470183A (da) 1984-04-19
FI833785A0 (fi) 1983-10-17
NO160272C (no) 1989-03-29
FI76208B (fi) 1988-05-31
US4596020A (en) 1986-06-17
DK164376C (da) 1992-11-09

Similar Documents

Publication Publication Date Title
DE2641261C2 (de) Stranggießkokille für brammenartige Rechteckstränge mit Induktionsspule
DE69012090T2 (de) Verfahren und Vorrichtung zur Herstellung von thixotropen metallischen Produkten mittels Strangguss und elektromagnetischem Rühren.
DE2850595A1 (de) Wassergekuehlter einsatz fuer einen elektrischen schmelzofen
DE2657551C3 (de) Vorrichtung zur Herstellung von Guß mit gerichtetem Gefuge
CH627956A5 (de) Elektromagnetische mehrphasige ruehrvorrichtung an einer stranggiessmaschine.
DE2401145A1 (de) Verfahren und vorrichtung zum kontinuierlichen giessen
DE3122155C2 (fr)
DE602004004270T2 (de) Stranggussanlage zur elektromagnetischen drehung von sich in der düse bewegender metallschmelze
DE69401814T2 (de) Vorrichtung zur zufuhr einer metallschmelze, insbesondere gusseisen, bei einer giessmaschine, sowie giessmachine ausgerüstet mit dergleiche schmelzzuführung
DE1508893B1 (de) Schmelzverfahren zur Herstellung von Gussbloecken mittels Abschmelzelektroden
DE2825035C3 (de) Stranggießkokille für Brammen
DE3106591C2 (de) Von einem Kühlmittel durchströmte Stranggußkokille
EP0106792B1 (fr) Agencement de four pour fondre et chauffer du métal
EP0563802B1 (fr) Culasse magnétique pour un four à induction à creuset
DE2057747C3 (de) Elektrisches Heizelement aus einem hitze- und oxidationsbeständigen Material
DE1765522B1 (de) Elektrischer induktionsofen fuer metallwerkstuecke
DE499534C (de) Spule fuer elektrische Induktionsoefen
DE60121169T2 (de) Eine vorrichtung zum kontinuierlichen oder halbkontinuierlichen giessen eines metalls
DE2935394A1 (de) Ofenanlage, insbesondere zum schmelzen von erzkonzentrat
EP0719867A1 (fr) Enceinte de four à arc à courant continu
DE619807C (de) Induktionsofen mit quader- oder wuerfelfoermigem Herd
CH641893A5 (en) Heat exchanger element, method for producing it, and a heat exchanger
DE1558768C3 (de) Anlage zum Elektroschlackeumschmelzen
LU83099A1 (de) Anordnung zum stranggiessen von metallen
DE4042469C2 (de) Vorrichtung zum Erhitzen von geschmolzenem Metall in einer Gießpfanne

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT DE FR GB IT

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Designated state(s): AT DE FR GB IT

17P Request for examination filed

Effective date: 19860306

17Q First examination report despatched

Effective date: 19870213

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT DE FR GB IT

REF Corresponds to:

Ref document number: 34833

Country of ref document: AT

Date of ref document: 19880615

Kind code of ref document: T

REF Corresponds to:

Ref document number: 3376872

Country of ref document: DE

Date of ref document: 19880707

ET Fr: translation filed
ITF It: translation for a ep patent filed

Owner name: JACOBACCI & PERANI S.P.A.

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 19911015

Year of fee payment: 9

ITTA It: last paid annual fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Effective date: 19921007

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19930928

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19931011

Year of fee payment: 11

Ref country code: DE

Payment date: 19931011

Year of fee payment: 11

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19941007

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19941007

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19950630

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19950701

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST