EP0170556B1 - Electromagnetic induction device for the heating of metallic elements - Google Patents
Electromagnetic induction device for the heating of metallic elements Download PDFInfo
- Publication number
- EP0170556B1 EP0170556B1 EP85401260A EP85401260A EP0170556B1 EP 0170556 B1 EP0170556 B1 EP 0170556B1 EP 85401260 A EP85401260 A EP 85401260A EP 85401260 A EP85401260 A EP 85401260A EP 0170556 B1 EP0170556 B1 EP 0170556B1
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- European Patent Office
- Prior art keywords
- magnetic circuit
- loop
- windings
- constituted
- winding
- 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.)
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- 229910052751 metal Inorganic materials 0.000 title claims description 18
- 238000010438 heat treatment Methods 0.000 title claims description 11
- 230000005674 electromagnetic induction Effects 0.000 title claims description 7
- 238000004804 winding Methods 0.000 claims description 31
- 238000001816 cooling Methods 0.000 claims description 14
- 239000012809 cooling fluid Substances 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 6
- 239000002184 metal Substances 0.000 description 5
- 230000004907 flux Effects 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229910000859 α-Fe Inorganic materials 0.000 description 3
- 238000009749 continuous casting Methods 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- -1 ferrous metals Chemical class 0.000 description 1
- 230000002068 genetic effect Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003303 reheating Methods 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
- H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
- H05B6/101—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces
- H05B6/103—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces multiple metal pieces successively being moved close to the inductor
- H05B6/104—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces multiple metal pieces successively being moved close to the inductor metal pieces being elongated like wires or bands
-
- 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
- H05B6/42—Cooling of coils
Definitions
- the present invention relates to an electromagnetic induction device for heating metal elements.
- This device applies to heat treatments by induction, of metallic elements and in particular of aluminum wires or bars. It is known to carry out heat treatments using a solenoid inductor inside which the metal element to be treated circulates.
- This type of device has the advantage of being very simple but it has significant drawbacks: its yield is low for non-ferrous metals; moreover, when metallic elements such as aluminum wires or bars coming from a continuous casting system are to be treated, these elements as a result of operating incidents of the downstream mechanical system can become entangled in the solenoid and cause it to deteriorate.
- Another type of electromagnetic induction device for heating metallic elements; this other device comprises a magnetic circuit having the form of a flat loop open at two ends situated face to face, and inductor windings wound on this circuit.
- the metallic element to be heated is placed in the air gap located between the two ends of the loop.
- This device is described in French patent application No. 2,489,645 filed on 08/28.81, in the name of the same applicant.
- This type of device although not having the drawback of being able to be damaged during the movement of the metal wires to be treated, nevertheless presents a very low yield; this low efficiency results essentially from the location of the inductor windings on the magnetic circuit as well as losses occurring in the magnetic circuit and the windings. These windings are indeed located far enough from the air gap and the efficiency is quite low because of the eddy current losses and thermal losses.
- the object of the invention is to remedy the drawbacks mentioned above and in particular to produce an electromagnetic induction device, for heating metal elements, having a high efficiency, in which the heat losses and the eddy current losses are minimized. ; the shape of the device also makes it possible to heat metal elements in the form of rod wires or wires circulating in the air gap continuously, without risk of deterioration.
- the subject of the invention is an electromagnetic induction device for heating metallic elements comprising at least one magnetic circuit in a planar loop open at two ends located face to face, an inductor wound on this magnetic circuit, the element to be heated being placed in the air gap located between the two ends of the loop, characterized in that said inductor comprises two windings wound on the magnetic circuit, respectively near the two ends of the loop, these windings being supplied respectively by alternating electric currents in phase, each end of the loop tapering in the shape of a chamfer towards the air gap, this chamfer being produced around the entire periphery of each end of the loop, the magnetic circuit comprising at least in the vicinity of said ends of the cooling means constituted by at least one conduit traversed by a cooling fluid and located inside the circuit ma genetic.
- the windings include cooling means.
- the magnetic circuit consists of an assembly of plates cut respectively in the form of elementary loops open at two ends, these plates being cut and assembled so that their ends form said chamfers.
- the cooling duct inside the magnetic circuit consists of hollow plates of this magnetic circuit.
- a notch is cut on each of the faces of the ends of the loop, perpendicular to the direction of the field created by the coil and perpendicular to the plane of the loop of the magnetic circuit.
- each winding is constituted by a cable with several strands, wound around the inductor in the vicinity of the corresponding end of the loop.
- said means for cooling each winding consist of a sheath containing each cable and traversed by a cooling fluid.
- the device comprises at least one pair of identical magnetic circuits placed side by side, parallel to one another, so that their air gaps are opposite one another, the winding wound. on one of the magnetic circuits being supplied by an alternating current in phase with the alternating current which supplies the other winding.
- the single figure schematically represents a device according to the invention.
- This electromagnetic induction device makes it possible to heat metal elements and in particular aluminum wires or bars coming from a continuous casting system; these wires or bars must undergo a heat treatment by reheating up to 520 ° C. for example.
- the device comprises at least one magnetic circuit 2 in a flat loop open at two ends 3, 4, located face to face.
- This device also includes an inductor with two windings 5, 6, wound on the circuit magnetic 2, respectively near the two ends 3,4 of the loop.
- the metal element to be heated is placed in the air gap 7, between the two ends of the loop; the windings 5, 6 are supplied respectively by alternating electric currents in phase, supplied for example by an electric source of alternating current 8.
- Each end of the loop of the magnetic circuit 2 has the shape of a chamfer directed towards the air gap 7
- Notches 9, 10 are cut on the faces of the ends 3, 4 of the loop of the magnetic circuit 2, perpendicular to the direction of the field created by the coils and perpendicular to the plane of the loop of the magnetic circuit. It should be noted that the chamfers are made around the entire periphery of each end of the loop.
- the magnetic circuit can be constituted either by sheets of soft iron, or by blocks of ferrite.
- the chamfers at the opposite ends of this circuit make it possible to increase the concentration of the magnetic field, towards the metallic element to be heated.
- the chamfers 24 and 25 also make it possible to reduce the heating of the magnetic circuit, due to the eddy currents, which would occur on the edges of the ends of the magnetic circuit, in the absence of chamfers.
- the notches 9, 10 are intended to ensure good mechanical stability in the air gap of the heated mechanical element, in particular when the latter has the form of a wire or a bar. They in fact make it possible to produce a constant magnetic field in the air gap thus avoiding the appearance of repulsion forces which tend to eject the element to be heated from the air gap.
- a guide piece 11 is placed in the air gap 7; this guide piece which can be constituted for example in a thermally insulating material is integral with the ends of the loop of the magnetic circuit 2 and bears on the bottom of the notches 9, 10.
- the windings 5, 6 are wound at the ends of the loop 2 , as close as possible to the air gap, so as to avoid leakage of magnetic flux.
- These windings consist of cables 12, 13 with several strands (of copper for example) shown diagrammatically in the figure.
- Winding cooling means are provided:
- the windings make it possible to limit the losses by eddy currents due to the induction which leaves the magnetic circuit; the efficiency of the device is increased by this type of inductor.
- Means for cooling the magnetic circuit 2 are also provided in the vicinity of the ends of the loop; they are constituted by conduits 19,20 connected for example to the pump 17 and to the reservoir 18 making it possible to circulate a cooling liquid, in conduits internal to the magnetic circuit 2.
- These cooling circuits which are known in the state of technique, are not shown in the figure.
- the cooling of the iron sheets or of the ferrite blocks of the magnetic circuit 2 also makes it possible to increase the efficiency of the device.
- the cooling circuit inside the magnetic circuit can be constituted by a suitably shaped duct or by a "water box" matching the shape of the magnetic circuit, in particular in the vicinity of each end of the loop, these water boxes being able to be formed by some of the plates of the magnetic circuit which can be hollow.
- the iron plates or the ferrite blocks which constitute the magnetic circuit are assembled by means known in the state of the art and not shown in the figure. These plates are cut so as to have the form of loops and so that after assembly, the ends of the magnetic circuit form chamfers.
- the device of the invention preferably comprises a pair of identical magnetic circuits 2, 21, placed side by side, parallel to one another, so that their air gaps 7, 22 are opposite one of the other.
- the second magnetic circuit 21 also comprises two windings (not shown in the figure), wound at each of its ends, as well as guide means 23, in the air gap 22.
- the windings wound on the second magnetic circuit 21 are supplied (not shown but similar to that of the windings 5, 6) by an alternating electric current in phase opposition with the alternating current which supplies the windings wound on the magnetic circuit 2.
- the aluminum wire or bar to be heated circulates in the thermally insulating guide parts 11, 23.
- the supply of the windings of the first and second magnetic circuits 2, 21 by alternating currents in phase opposition makes it possible to respectively produce, in the air gaps of these windings, magnetic fluxes of opposite directions; this arrangement makes it possible to avoid the presence of any magnetic flux in the circuit formed by the element to be heated and by the devices which make it possible to handle this element. Any magnetic flux in this circuit in fact causes the appearance of a current detrimental to the heating of the metallic element.
- Tests carried out on a sample constituted by an aluminum wire of 26 mm in diameter made it possible to show that the yield of the device was 65%; the device which allowed these tests has, for each of the magnetic circuits, an air gap of width 45 mm.
- the windings, for these tests are supplied by an alternating current of intensity close to 2500 A and having a frequency of 280 Hz; the power of the device is 14000 W.
- the device used for the tests made it possible to bring the temperature of the aluminum wire to 520 °.
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- General Induction Heating (AREA)
Description
La présente invention concerne un dispositif à induction électromagnétique pour le chauffage d'étéments métalliques. Ce dispositif s'applique aux traitements thermiques par induction, d'éléments métalliques et notamment de fils ou barres d'aluminium. On sait réaliser des traitements thermiques à l'aide d'un inducteur solénoide à l'intérieur duquel circule l'élément métallique à traiter. Ce type de dispositif à pour avantage d'être très simple mais il présente d'importants inconvénients: son rendement est faible pour les non-ferreux; de plus, lorsque des éléments métalliques tels que des fils ou barres d'aluminium provenant d'un système de coulée continue, sont à traiter, ces éléments par suite d'incidents de fonctionnement du système mécanique aval peuvent venir s'enchevêtrer dans le solénoïde et provoquer sa détérioration.The present invention relates to an electromagnetic induction device for heating metal elements. This device applies to heat treatments by induction, of metallic elements and in particular of aluminum wires or bars. It is known to carry out heat treatments using a solenoid inductor inside which the metal element to be treated circulates. This type of device has the advantage of being very simple but it has significant drawbacks: its yield is low for non-ferrous metals; moreover, when metallic elements such as aluminum wires or bars coming from a continuous casting system are to be treated, these elements as a result of operating incidents of the downstream mechanical system can become entangled in the solenoid and cause it to deteriorate.
On connaît aussi un autre type de dispositif à induction électromagnétique, pour le chauffage d'éléments métalliques; cet autre dispositif comprend un circuit magnétique ayant la forme d'une boucle plane ouverte à deux extrémités situées face à face, et des enroulements inducteurs bobinés sur ce circuit. L'élément métallique à chauffer est placé dans l'entrefer situé entre les deux extrémités de la boucle. Ce dispositif est décrit dans la demande de brevet français n° 2 489 645 déposée le 27/08.81, au nom du même demandeur. Ce type de dispositif, bien que ne présentant pas l'inconvénient de pouvoir être détérioré lors du déplacement des fils métalliques à traiter, présente cependant un rendement très faible; ce faible rendement résulte essentiellement de l'emplacement des enroulements inducteurs sur le circuit magnétique ainsi que des pertes intervenant dans le circuit magnétique et les enroulements. Ces enroulements sont en effet situés assez loin de l'entrefer et le rendement est assez faible à cause des pertes par courants de Foucault et des pertes thermiques.Another type of electromagnetic induction device is also known, for heating metallic elements; this other device comprises a magnetic circuit having the form of a flat loop open at two ends situated face to face, and inductor windings wound on this circuit. The metallic element to be heated is placed in the air gap located between the two ends of the loop. This device is described in French patent application No. 2,489,645 filed on 08/28.81, in the name of the same applicant. This type of device, although not having the drawback of being able to be damaged during the movement of the metal wires to be treated, nevertheless presents a very low yield; this low efficiency results essentially from the location of the inductor windings on the magnetic circuit as well as losses occurring in the magnetic circuit and the windings. These windings are indeed located far enough from the air gap and the efficiency is quite low because of the eddy current losses and thermal losses.
L'invention a pour but de remédier aux inconvénients mentionnés plus haut et notamment de réaliser un dispositif à induction électromagnétique, pour le chauffage d'éléments métalliques, présentant un rendement élevé, dans lequel les pertes thermiques et les pertes par courants de Foucault sont minimisées; la forme du dispositif permet en outre de chauffer des éléments métalliques ayant la forme de fils barres ou de fils circulant dans l'entrefer de manière continue, sans risque de détérioration.The object of the invention is to remedy the drawbacks mentioned above and in particular to produce an electromagnetic induction device, for heating metal elements, having a high efficiency, in which the heat losses and the eddy current losses are minimized. ; the shape of the device also makes it possible to heat metal elements in the form of rod wires or wires circulating in the air gap continuously, without risk of deterioration.
L'invention a pour objet un dispositif à induction électromagnétique pour le chauffage d'éléments métalliques comprenant au moins un circuit magnétique en boucle plane ouverte à deux extrémités situées face à face, un inducteur bobiné sur ce circuit magnétique, l'élément à chauffer étant placé dans l'entrefer situé entre les deux extrémités de la boucle, caractérisé en ce que ledit inducteur comprend deux enroulements bobinés sur le circuit magnétique, respectivement à proximité des deux extrémités de la boucle, ces enroulements étant alimentés respectivement par des courants électriques alternatifs en phase, chaque extrémité de la boucle s'amincissant en forme de chanfrein vers l'entrefer, ce chanfrein étant réalisé sur tout le pourtour de chaque extrémité de la boucle, le circuit magnétique comprenant au moins au voisinage desdites extrémités des moyens de refroidissement constitués par au moins un conduit parcouru par un fluide de refroidissement et situé à l'intérieur du circuit magnétique.The subject of the invention is an electromagnetic induction device for heating metallic elements comprising at least one magnetic circuit in a planar loop open at two ends located face to face, an inductor wound on this magnetic circuit, the element to be heated being placed in the air gap located between the two ends of the loop, characterized in that said inductor comprises two windings wound on the magnetic circuit, respectively near the two ends of the loop, these windings being supplied respectively by alternating electric currents in phase, each end of the loop tapering in the shape of a chamfer towards the air gap, this chamfer being produced around the entire periphery of each end of the loop, the magnetic circuit comprising at least in the vicinity of said ends of the cooling means constituted by at least one conduit traversed by a cooling fluid and located inside the circuit ma genetic.
Selon une autre caractéristique, les enroulements comprennent des moyens de refroidissement.According to another characteristic, the windings include cooling means.
Selon une autre caractéristique, le circuit magnétique est constitué par un assemblage de plaques découpées respectivement en forme de boucles élémentaires ouvertes à deux extrémités, ces plaques étant découpées et assemblées pour que leurs extrémités forment lesdits chanfreins.According to another characteristic, the magnetic circuit consists of an assembly of plates cut respectively in the form of elementary loops open at two ends, these plates being cut and assembled so that their ends form said chamfers.
Selon une autre caractéristique, le conduit de refroidissement à l'intérieur du circuit magnétique est constitué par des plaques creuses de ce circuit magnétique.According to another characteristic, the cooling duct inside the magnetic circuit consists of hollow plates of this magnetic circuit.
Selon une autre caractéristique, une encoche est taillée sur chacune des faces des extrémités de la boucle, perpendiculairement à la direction du champ créée par la bobine et perpendiculairement au plan de la boucle du circuit magnétique.According to another characteristic, a notch is cut on each of the faces of the ends of the loop, perpendicular to the direction of the field created by the coil and perpendicular to the plane of the loop of the magnetic circuit.
Selon une autre caractéristique, chaque enroulement est constitué par un câble à plusieurs brins, bobiné autour de l'inducteur au voisinage de l'extrémité correspondante de la boucle.According to another characteristic, each winding is constituted by a cable with several strands, wound around the inductor in the vicinity of the corresponding end of the loop.
Selon une autre caractéristique, lesdits moyens de refroidissement de chaque enroulement sont constitués par une gaine contenant chaque câble et parcourue par un fluide de refroidissement.According to another characteristic, said means for cooling each winding consist of a sheath containing each cable and traversed by a cooling fluid.
Selon une autre caractéristique, le dispositif comprend au moins une paire de circuits magnétiques identiques placés côte à côte, parallèlement l'un à l'autre, de manière que leurs entrefers soient en regard l'un de l'autre, l'enroulement bobiné sur l'un des circuits magnétiques étant alimenté par un courant alternatif en phase avec le courant alternatif qui alimente l'autre enroulement.According to another characteristic, the device comprises at least one pair of identical magnetic circuits placed side by side, parallel to one another, so that their air gaps are opposite one another, the winding wound. on one of the magnetic circuits being supplied by an alternating current in phase with the alternating current which supplies the other winding.
Les caractéristiques et avantages de l'invention ressortiront mieux de la description qui va suivre, donnée en référence à la figure unique annexée.The characteristics and advantages of the invention will emerge more clearly from the description which follows, given with reference to the single appended figure.
La figure unique représente schématiquement un dispositif conforme à l'invention. Ce dispositif à induction électromagnétique permet de chauffer des éléments métalliques et notamment des fils ou barres d'aluminium provenant d'un système de coulée continue; ces fils ou barres doivent subir un traitement thermique par réchauffage jusqu'à 520°C par exemple.The single figure schematically represents a device according to the invention. This electromagnetic induction device makes it possible to heat metal elements and in particular aluminum wires or bars coming from a continuous casting system; these wires or bars must undergo a heat treatment by reheating up to 520 ° C. for example.
Le dispositif comprend au moins un circuit magnétique 2 en boucle plane ouverte à deux extrémités 3, 4, situées face à face. Ce dispositif comprend aussi un inducteur à deux enroulements 5, 6, bobinés sur le circuit magnétique 2, respectivement à proximité des deux extrémités 3,4 de la boucle. L'élément métallique à chauffer est placé dans l'entrefer 7, entre les deux extrémités de la boucle; les enroulements 5, 6 sont alimentés respectivement par des courants électriques alternatifs en phase, fournis par exemple par une source électrique de courant alternatif 8. Chaque extrémité de la boucle du circuit magnétique 2 a la forme d'un chanfrein dirigé vers l'entrefer 7. Des encoches 9, 10 sont taillées sur les faces des extrémités 3, 4 de la boucle du circuit magnétique 2, perpendiculairement à la direction du champ créée par les bobines et perpendiculairement au plan de la boucle du circuit magnétique. Il est à remarquer que les chanfreins sont réalisés sur tout le pourtour de chaque extrémité de la boucle.The device comprises at least one magnetic circuit 2 in a flat loop open at two ends 3, 4, located face to face. This device also includes an inductor with two
Dans les dispositifs connus, seuls sont réalisés les chanfreins tels que 3 et 27. Il en résulte, dans ces dispositifs connus, des pertes localisées par courants de Foucault. En effet, en l'absence de chanfreins tels que 25, des lignes du champ magnétique se referment perpendiculairement aux tôles du circuit magnétique, en passant à l'extérieur de l'entrefer. L'une de ces lignes est représentée en traits interrompus en 26. Dans l'invention, ces lignes n'existent évidemment pas, justement grâce aux chanfreins tels que 25. Les pertes par courants de Foucault sont minimisées et le rendement du dispositif est bien meilleur. Dans l'invention, seules sont présentes des lignes de champ magnétique perpendiculaires aux deux faces en regard des deux extrémités de la boucle, dans l'entrefer.In known devices, only the chamfers such as 3 and 27 are produced. In these known devices, this results in localized losses by eddy currents. Indeed, in the absence of chamfers such as 25, lines of the magnetic field close perpendicularly to the sheets of the magnetic circuit, passing outside the air gap. One of these lines is shown in broken lines at 26. In the invention, these lines obviously do not exist, precisely thanks to chamfers such as 25. The losses by eddy currents are minimized and the efficiency of the device is well better. In the invention, only magnetic field lines are present perpendicular to the two faces opposite the two ends of the loop, in the air gap.
Le circuit magnétique peut être constitué soit par des tôles de fer doux, soit par des blocs de ferrite. Les chanfreins aux extrémités opposées de ce circuit permettent d'augmenter la concentration du champ maqnétique, vers l'élément métallique à chauffer. Les chanfreins 24 et 25 permettent également de réduire les échauffements du circuit magnétique, dus aux courants de Foucault, qui se produiraient sur les bords des extrémités du circuit magnétique, en absence de chanfreins. Les encoches 9, 10 sont destinées à assurer dans l'entrefer une bonne stabilité mécanique de l'élément mécanique chauffé, notamment lorsque celui-ci a la forme d'un fil ou d'une barre. Elles permettent en fait de produire un champ magnétique constant dans l'entrefer évitant ainsi l'apparition de forces de répulsion qui ont tendance à éjecter de l'entrefer l'élément à chauffer. En effet, en absence d'encoche, un point d'équilibre instable apparaît à mi-hauteur de l'entrefer. De manière à parfaire le guidage de l'élément métallique à chauffer, notamment lorsque celui-ci a la forme d'un fil ou d'une barre, une pièce de guidage 11 est placée dans l'entrefer 7; cette pièce de guidage qui peut être constituée par exemple dans un matériau thermiquement isolant est solidaire des extrémités de la boucle du circuit magnétique 2 et prend appui au fond des encoches 9, 10. Les enroulements 5, 6 sont bobinés aux extrémités de la boucle 2, au plus près de l'entrefer, de manière à éviter les fuites de flux magnétique. Ces enroulements sont constitués par des câbles 12, 13 à plusieurs brins (de cuivre par exemple) représentés schématiquement sur la figure.The magnetic circuit can be constituted either by sheets of soft iron, or by blocks of ferrite. The chamfers at the opposite ends of this circuit make it possible to increase the concentration of the magnetic field, towards the metallic element to be heated. The
Des moyens de refroidissement des enroulements sont prévus:Winding cooling means are provided:
Dans le mode de réalisation de l'invention, ils sont constitués par des gaines plastiques 15, 16 enrobant les câbles et dans lesquelles circule un liquide de refroidissement, provenant d'une pompe 17 reliée à un réservoir 18 contenant ce liquide de refroidissement (de l'eau par exemple). Le refroidissement des enroulements permet de limiter les pertes par courants de Foucault dues à l'induction qui sort du circuit magnétique; le rendement du dispositif est accru par ce type d'inducteur.In the embodiment of the invention, they are constituted by
Des moyens de refroidissement du circuit magnétique 2 sont également prévus au voisinage des extrémités de la boucle; ils sont constitués par des conduits 19,20 reliés par exemple à la pompe 17 et au réservoir 18 permettant de faire circuler un liquide de refroidissement, dans des conduits internes au circuit magnétique 2. Ces circuits de refroidissement qui sont connus dans l'état de la technique, ne sont pas représentés sur la figure. Le refroidissement des tôles de fer ou des blocs de ferrite du circuit magnétique 2, permet aussi d'accroître le rendement du dispositif.Means for cooling the magnetic circuit 2 are also provided in the vicinity of the ends of the loop; they are constituted by
Le circuit de refroîdissement à l'intérieur du circuit magnétique peut être constitué par un conduit de forme appropriée ou par une "boîte à eau" épousant la forme du circuit magnétique, notamment au voisinage de chaque extrémité de la boucle, ces boîtes à eau pouvant être constituées par certaines des plaques du circuit magnétique qui peuvent être creuses. Les plaques de fer ou les blocs de ferrite qui constituent le circuit magnétique sont assemblés par des moyens connus dans l'état de la technique et non représentés sur la figure. Ces plaques sont découpées de manière à présenter la forme de boucles et de manière qu'après assemblage, les extrémités du circuit magnétique forment des chanfreins.The cooling circuit inside the magnetic circuit can be constituted by a suitably shaped duct or by a "water box" matching the shape of the magnetic circuit, in particular in the vicinity of each end of the loop, these water boxes being able to be formed by some of the plates of the magnetic circuit which can be hollow. The iron plates or the ferrite blocks which constitute the magnetic circuit are assembled by means known in the state of the art and not shown in the figure. These plates are cut so as to have the form of loops and so that after assembly, the ends of the magnetic circuit form chamfers.
Le dispositif de l'invention comprendde préférence une paire de circuits magnétiques 2, 21, identiques, placés côte à côte, parallèlement l'un à l'autre, de manière que leurs entrefers 7, 22 soient en regard l'un de l'autre. Le deuxième circuit magnétique 21 comprend aussi deux enroulements (non représentés sur la figure), bobinés à chacune de ses extrémités, ainsi que des moyens de guidage 23, dans l'entrefer 22. Les enroulements bobinés sur le deuxième circuit magnétique 21 sont alimentés (de manière non représentée mais semblable à celle des enroulements 5, 6) par un courant électrique alternatif en opposition de phase avec le courant alternatif qui alimente les enroulements bobinés sur le circuit magnétique 2. Le fil ou la barre d'aluminium à chauffer circulent dans les pièces de guidage thermiquement isolante 11, 23.The device of the invention preferably comprises a pair of identical
L'alimentation des enroulements des premier et deuxième circuits magnétiques 2, 21 par des courants alternatifs en opposition de phase permet de produire respectivement, dans les entrefers de ces enroulements, des flux magnétiques de sens opposés; cette disposition permet d'éviter la présence de tout flux magnétique dans le circuit formé par l'élément à réchauffer et par les appareils qui permettent de manipuler cet élément. Tout flux magnétique dans ce circuit provoque en effet l'apparition d'un courant préjudiciable au chauffage de l'élément métallique.The supply of the windings of the first and second
Des essais effectués sur un échantillon constitué par un fil d'aluminium de 26 mm de diamètre ont permis de montrer que le rendement du dispositif était de 65 %; le dispositif qui a permis ces essais présente, pour chacun des circuits magnétiques, un entrefer de largeur 45 mm. Les enroulements, pour ces essais, sont alimentés par un courant alternatif d'intensité voisine de 2500 À et présentant une fréquence de 280 Hz; la puissance du dispositif est de 14000 W. Le dispositif mis en oeuvre pour les essais a permis de porter la température du fil d'aluminium à 520°.Tests carried out on a sample constituted by an aluminum wire of 26 mm in diameter made it possible to show that the yield of the device was 65%; the device which allowed these tests has, for each of the magnetic circuits, an air gap of width 45 mm. The windings, for these tests, are supplied by an alternating current of intensity close to 2500 A and having a frequency of 280 Hz; the power of the device is 14000 W. The device used for the tests made it possible to bring the temperature of the aluminum wire to 520 °.
Claims (8)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8410225A FR2566986B1 (en) | 1984-06-28 | 1984-06-28 | ELECTROMAGNETIC INDUCTION DEVICE FOR HEATING METAL ELEMENTS |
| FR8410225 | 1984-06-28 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0170556A1 EP0170556A1 (en) | 1986-02-05 |
| EP0170556B1 true EP0170556B1 (en) | 1989-05-10 |
Family
ID=9305563
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP85401260A Expired EP0170556B1 (en) | 1984-06-28 | 1985-06-24 | Electromagnetic induction device for the heating of metallic elements |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US4673781A (en) |
| EP (1) | EP0170556B1 (en) |
| JP (1) | JPS6119095A (en) |
| AU (1) | AU580073B2 (en) |
| CA (1) | CA1249037A (en) |
| DE (1) | DE3570169D1 (en) |
| FR (1) | FR2566986B1 (en) |
Families Citing this family (34)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2608347B1 (en) * | 1986-12-11 | 1989-02-24 | Siderurgie Fse Inst Rech | INDUCTOR FOR INDUCTIVE HEATING OF METALLURGICAL PRODUCTS |
| DE3717742C2 (en) * | 1987-05-26 | 1997-12-18 | Blum Gmbh & Co E | Induction heating device |
| FR2630612B1 (en) * | 1988-04-26 | 1996-05-24 | Siderurgie Fse Inst Rech | DEVICE FOR PROTECTING INDUCER POLES AND INDUCER PROVIDED WITH SUCH DEVICE |
| DE3939017C2 (en) * | 1988-12-15 | 1998-07-02 | Blum Gmbh & Co E | Inductively heated device |
| JPH02207478A (en) * | 1989-02-06 | 1990-08-17 | Kazuo Tsumura | High frequency heating device by use of current in resonance circuit |
| FR2657216B1 (en) * | 1990-01-16 | 1995-09-01 | Sundgau Sarl Atel Const Elect | INDUCTOR FOR AN INDUCTION OVEN, COMPRISING A TUBE RUNNED BY A COOLING LIQUID. |
| FR2661849B1 (en) * | 1990-05-10 | 1995-03-17 | Siderurgie Fse Inst Rech | METHOD AND DEVICES FOR INDUCTION HEATING OF A METALLURGICAL PRODUCT IN AN ELONGATE SHAPE. |
| US5025124A (en) * | 1990-06-01 | 1991-06-18 | Alfredeen Lennart A | Electromagnetic device for heating metal elements |
| US5483042A (en) * | 1990-06-04 | 1996-01-09 | Nordson Corporation | Magnetic separator |
| US5847370A (en) * | 1990-06-04 | 1998-12-08 | Nordson Corporation | Can coating and curing system having focused induction heater using thin lamination cores |
| US5529703A (en) * | 1990-06-04 | 1996-06-25 | Nordson Corporation | Induction dryer and magnetic separator |
| FR2663490B1 (en) * | 1990-06-15 | 1992-09-11 | Rotelec Sa | INDUCTIVE HEATING COIL. |
| US5101086A (en) * | 1990-10-25 | 1992-03-31 | Hydro-Quebec | Electromagnetic inductor with ferrite core for heating electrically conducting material |
| DE69132177T2 (en) * | 1990-11-30 | 2000-12-21 | Nordson Corp., Westlake | Induction dryer and magnetic separator |
| ZA9210102B (en) * | 1992-02-10 | 1993-08-24 | Heron Tech Inc | Induction dryer and magnetic separator |
| AU692351B2 (en) * | 1992-05-08 | 1998-06-04 | Nordson Corporation | Induction dryer and method |
| AU665005B2 (en) * | 1992-05-08 | 1995-12-14 | Nordson Corporation | Induction dryer and magnetic separator |
| WO1993023970A1 (en) * | 1992-05-08 | 1993-11-25 | Heron Technologies, Inc. | Induction dryer and magnetic separator |
| US5239916A (en) * | 1993-02-26 | 1993-08-31 | Lungchiang Hu | Watercool electromagnetic induction heating wok |
| US5461215A (en) * | 1994-03-17 | 1995-10-24 | Massachusetts Institute Of Technology | Fluid cooled litz coil inductive heater and connector therefor |
| US6043472A (en) | 1996-08-28 | 2000-03-28 | Didier-Werke Ag | Assembly of tapping device and inductor therefor |
| JP2001525111A (en) * | 1997-05-13 | 2001-12-04 | コアフラックス・システムズ・インターナショナル・リミテッド | Induction heating device for metal parts |
| DE19742427A1 (en) * | 1997-09-25 | 1999-04-08 | Siemens Ag | Process for solidifying winding coils of electrical machines |
| US6091063A (en) * | 1998-11-06 | 2000-07-18 | The Boeing Company | Method for improving thermal uniformity in induction heating processes |
| US6084225A (en) * | 1999-05-17 | 2000-07-04 | The Lepel Corporation | RF induction coil |
| DE19937493C2 (en) * | 1999-08-07 | 2001-06-07 | Mfh Hyperthermiesysteme Gmbh | Magnetic field applicator for heating magnetic or magnetizable substances or solids in biological tissue |
| DE19937492C2 (en) * | 1999-08-07 | 2001-08-23 | Mfh Hyperthermiesysteme Gmbh | Magnetic field applicator for heating magnetic or magnetizable substances or solids in biological tissue |
| US6271507B2 (en) * | 1999-10-08 | 2001-08-07 | Molex Incorporated | Apparatus and method for bonding conductors |
| DE102007051144B4 (en) * | 2007-07-26 | 2010-06-02 | Zenergy Power Gmbh | Induction heater and method for adjusting the width of the wells of such induction heater |
| US8415595B2 (en) * | 2008-04-15 | 2013-04-09 | Honeywell International Inc. | System, apparatus, and method for induction heating using flux-balanced induction heating workcoil |
| MX2012009520A (en) * | 2010-02-19 | 2012-08-31 | Nippon Steel Corp | Transverse flux induction heating device. |
| WO2012040572A2 (en) * | 2010-09-23 | 2012-03-29 | Radyne Corporation | Transverse flux electric induction heat treatment of a discrete workpiece in a gap of a magentic circuit |
| WO2012040586A2 (en) * | 2010-09-23 | 2012-03-29 | Radyne Corporation | Electric induction heat treatment of longitudinally-oriented workpieces |
| US9596720B2 (en) | 2013-03-15 | 2017-03-14 | ProtoParadigm LLC | Inductively heated extruder heater |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2457843A (en) * | 1944-09-02 | 1949-01-04 | Ohio Crankshaft Co | Flexible conductor for induction heating |
| US3467806A (en) * | 1968-04-25 | 1969-09-16 | Westinghouse Electric Corp | Induction heating device |
| US3663782A (en) * | 1971-06-10 | 1972-05-16 | United States Steel Corp | Laminated iron core induction corner-heating unit |
| AT323783B (en) * | 1972-03-28 | 1975-07-25 | Elin Union Ag | ARRANGEMENT FOR INDUCTIVE HEATING OF METALLIC WORKPIECES WITH SMALL CROSS-SECTION DIMENSIONS COMPARED TO THE LENGTH, WHITE IN PARTICULAR WIRES |
| GB1421493A (en) * | 1973-05-22 | 1976-01-21 | Electricity Council | Heat treatment of saw blades composition for pre-coating plastics sheets or films with adhesive materials |
| US4029926A (en) * | 1974-10-29 | 1977-06-14 | Roper Corporation | Work coil for use in an induction cooking appliance |
| FR2404371A1 (en) * | 1977-09-21 | 1979-04-20 | Onera (Off Nat Aerospatiale) | Electrical induction heating coils - have rigid U=shape with two rectangular coils in series |
| US4359620A (en) * | 1977-12-06 | 1982-11-16 | Amp Incorporated | Induction heating apparatus |
| US4281234A (en) * | 1979-04-20 | 1981-07-28 | Emerson Electric Co. | Method of induction annealing squirrel cage rotors |
| FR2489645A1 (en) * | 1980-08-27 | 1982-03-05 | Electricite De France | Induction heat treatment plant for non:ferromagnetic wire - using electromagnet coil on ferrite yoke with narrow air gap through which wire travels |
-
1984
- 1984-06-28 FR FR8410225A patent/FR2566986B1/en not_active Expired
-
1985
- 1985-06-24 AU AU43979/85A patent/AU580073B2/en not_active Ceased
- 1985-06-24 DE DE8585401260T patent/DE3570169D1/en not_active Expired
- 1985-06-24 EP EP85401260A patent/EP0170556B1/en not_active Expired
- 1985-06-27 US US06/749,303 patent/US4673781A/en not_active Expired - Fee Related
- 1985-06-27 CA CA000485528A patent/CA1249037A/en not_active Expired
- 1985-06-28 JP JP60140642A patent/JPS6119095A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0586637B2 (en) | 1993-12-13 |
| EP0170556A1 (en) | 1986-02-05 |
| FR2566986A1 (en) | 1986-01-03 |
| AU4397985A (en) | 1986-01-02 |
| AU580073B2 (en) | 1988-12-22 |
| DE3570169D1 (en) | 1989-06-15 |
| JPS6119095A (en) | 1986-01-27 |
| CA1249037A (en) | 1989-01-17 |
| US4673781A (en) | 1987-06-16 |
| FR2566986B1 (en) | 1986-09-19 |
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