EP1148762A1 - Induction heating device having transverse flux and variable width inductor - Google Patents
Induction heating device having transverse flux and variable width inductor Download PDFInfo
- Publication number
- EP1148762A1 EP1148762A1 EP01400868A EP01400868A EP1148762A1 EP 1148762 A1 EP1148762 A1 EP 1148762A1 EP 01400868 A EP01400868 A EP 01400868A EP 01400868 A EP01400868 A EP 01400868A EP 1148762 A1 EP1148762 A1 EP 1148762A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- strip
- magnetic
- heating device
- magnetic flux
- heating
- 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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- 238000010438 heat treatment Methods 0.000 title claims abstract description 35
- 230000004907 flux Effects 0.000 title claims description 24
- 230000006698 induction Effects 0.000 title claims description 13
- 238000004804 winding Methods 0.000 claims abstract description 21
- 229910052751 metal Inorganic materials 0.000 claims abstract description 5
- 239000002184 metal Substances 0.000 claims abstract description 5
- 230000005674 electromagnetic induction Effects 0.000 claims description 11
- 230000002787 reinforcement Effects 0.000 claims description 4
- 230000007480 spreading Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 239000004020 conductor Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 description 5
- 238000009434 installation Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 238000000137 annealing Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/10—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
- H05B6/365—Coil arrangements using supplementary conductive or ferromagnetic pieces
Definitions
- the present invention relates to a device for parade heating, by electromagnetic induction, low and medium magnetic or non-magnetic tapes thicknesses (of the order of 0.05 to 50 millimeters). She aims more particularly a device for heating by transverse flux induction.
- heating by induction parade electromagnetic of a metal strip is achieved using windings which are arranged so as to surround the strip to be heated by creating a magnetic field parallel to the outer surface of this strip in the direction of scrolling (longitudinal flow, see Figure 1a).
- windings which are arranged so as to surround the strip to be heated by creating a magnetic field parallel to the outer surface of this strip in the direction of scrolling (longitudinal flow, see Figure 1a).
- the main drawback of this type of installation is in the fact that the loop distribution of currents induced by the magnetic flux passing through does not allow generally not achieve temperature uniformity satisfactory, especially the ends in the direction of the band width (the edges) are too much or not enough heated according to the relative dimensions of the windings and of the magnetic circuit used in relation to the width of bandaged.
- EP-A-0 667 731 which discloses an induction heater electromagnetic with transverse flux in which one makes vary the length of the windings in order to adapt the flow distribution at bandwidths.
- this document suggests making these windings by assembling two opposing J-shaped inductors that can translate freely in a direction parallel to the bandwidth.
- this device does not allow to obtain a homogeneity transverse temperature very satisfactory.
- the present invention proposes to provide an original solution in producing an induction heating device electromagnetic with transverse flux whose circuit magnetic, produced by a plurality of bars independent magnetic, adapts to the width of the strip to heat. This device thus improves thermal uniformity across the width of the heating strip.
- the invention provides a heating device by electromagnetic induction of a metal strip scrolling in a specific direction comprising at least one electric winding arranged opposite at least one of large faces of said strip in order to heat the latter by cransverse magnetic flux induction, each winding being associated with at least one magnetic circuit, each circuit being divided into a plurality of bars magnetic not coupled together and arranged parallel to the direction of travel of the strip, said strip device being characterized in that said circuit magnetic, made up of said plurality of bars, independent of each other, adapts to the width of the strip to be heated by spreading or bringing together said bars of each other, so as to adapt in continues the distribution of said magnetic flux to the dimensions characteristics of said strip.
- the electromagnetic induction heater also includes screens made of good materials electrical conductivity placed in the air gap on both sides and on the other side of the strip and on the banks of the latter, so as to optimize temperature uniformity transverse.
- the surface of the magnetic circuit which is opposite of one of the large faces of the strip to heat a profile "polar" adapted (bisinusoidal for example) by cutting out magnetic sheets constituting this circuit so as to obtain better distribution of magnetic flux, and more particularly at the edges of said strip.
- polar profile means a surface of the magnetic circuit which is curved in the three directions of space.
- the device for heating by electromagnetic induction with transverse flux includes in particular two frames 1 and 1 'magnetic respectively provided with at least one electric winding 2 and arranged face to face on the side and other of a strip 4 to be heated.
- the latter can be for example guided in the air gap defined between the circuits magnetic using rollers (not shown) and so be transferred to the heating zone. Its displacement is generally continuous during the heating process according to the invention.
- the flow magnetic generated by electrical windings 2 crosspiece the strip to be heated 4 and induces therein a current which circulates in the plane of said strip and which closes in loop at the banks.
- the windings 2 are supplied with alternating current at medium frequency (for example, of the order of 50 to 20,000 Hz about).
- This circuit consists of a plurality of magnetic strips 8 arranged in parallel to the direction of travel of the strip 4 to be heated.
- the bars 8 making up the circuit magnetic 6 are not coupled together and are arranged parallel to each other. These bars are therefore independent of each other and they are also independent of the electrical windings. In in addition, they can slide using means 10 at level of the electrical windings 2 so as to deviate or get closer to each other, the electric windings remaining fixed. So the spacing between two bars adjacent can be enlarged or shrunk, continuously, under the action of said means 10. It follows that the distribution flux can be adapted to the dimensions of the strip 4, and in particular its width (cf. FIG. 2b).
- This essential characteristic of the present invention provides not only a space heater induction adaptable to different widths of the belt to heat, but above all the thermal homogeneity obtained in the direction of the width of said strip remains optimal some or the width of it.
- the spatial positioning of the magnetic strips associated with a suitable polar profile allow to act on the circulation of induced currents and therefore to control the transverse temperature distribution.
- the means 10 for sliding, continuously, the magnetic strips 8 at the level of the electrical windings 2, but without moving the latter, are constituted in particular by at least two parallel rails 11 and 11 ′ arranged each side of the surface of strip 4 and perpendicular to the direction of movement thereof.
- These rails support a plurality of frames 12, each of these frames being fixed to at least one bar 8.
- the support for the reinforcements of two is alternated adjacent bars on the two rails 11 and 11 'so to reduce congestion when the width of the circuit magnetic 6 is minimal (case where the spacing between bars is minimal).
- the frames slide on the rails using rollers 13 or the like so independent of each other which allows a very adjustment precise, optimal and continuous width of the circuit magnetic and therefore flow distribution. So we can for example make a width of the magnetic circuit varying from 800 to 1500 millimeters.
- the spacing between two adjacent magnetic strips 8 can be adjusted manually or automatically so to obtain the desired magnetic distribution.
- screens 14 in order to optimize the homogeneity of the transverse temperature of the strip to be heated, there are screens 14 in the air gap on either side of said strip and at the banks of the latter.
- Such screens are made of material with good electrical conductivity, for example of the copper type, aluminum or silver. Their function is to adjust the flow magnetic at the edges of the strip in order to control the temperature of the edges of said strip.
- these screens are also fixed on frames 15 supported by rails via rollers or analogues so that they can be animated by a movement of translation along the width of the strip used.
- magnetic pads 16 on the frames 15 supporting the screens 14 so as to refine the distribution of magnetic flux across the width of the strip, in particular such studs make it possible to fill possible temperature heterogeneities.
- These studs magnetic 16 can be coupled to screens 15 good electrical conductivity and / or magnetic strips 8 or be arranged without screens.
- the surface of the circuit is given magnetic 6 of each armature (1, 1 ') which is opposite one of the large faces of the strip 4 a "polar" profile, adapted so as to obtain a controlled distribution of the flow magnetic generated by the electrical windings 2, in particularly at the edges of said strip.
- a short-circuited turn is added (not shown) on either side of the heating device, perpendicular to the bars of the magnetic circuit and wrapping the moving tape to reduce the fields magnetic leakage at the ends of the inductor.
- FIG. 5 represents a schematic and partial view of a bright annealing plant, for example steel stainless.
- a bright annealing plant for example steel stainless.
- Such an annealing line is arranged on a single vertical strand whose total height must not exceed 50 meters approximately.
- the heating strip 18 which is guided by rollers 19, crosses over this height, first an area heating 20 then a cooling zone 21. So known for a strip of non-magnetic steel, it enters in the heating zone at room temperature (20 ° C approximately), must come out at a temperature of 1150 ° C and then be cooled to a temperature of 100 ° C at the end of the line.
- the electromagnetic induction heater according to the invention applied to such an installation has for advantage of being able to reduce the overall height of the heating zone up to approximately 10 meters, which saves much more room for cooling and allows thus reaching a line speed of 120 meters per minute for stainless steel with a thickness of 0.5 about a millimeter.
- the present invention offers therefore multiple advantages. It allows from electromagnetic induction heater using variable width magnetic circuits create a high intensity magnetic flux for medium frequencies. This density of magnetic flux allows achieve a power density transmitted to the band at heating, higher than that of known heating means. Thanks to the characteristics of the invention, there is no magnetic material in the inter-bar spaces, unlike systems according to the prior state of the technical. In addition, the electrical efficiency of this device is superior to that of known technologies. In addition, a such a device makes it possible to obtain thermal homogeneity satisfactory across the width of the strip.
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- General Induction Heating (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
Description
La présente invention est relative à un dispositif de chauffage au défilé, par induction électromagnétique, de bandes magnétiques ou amagnétiques de faible et moyenne épaisseurs (de l'ordre de 0,05 à 50 millimètres). Elle vise plus particulièrement un dispositif de chauffage par induction à flux transverse.The present invention relates to a device for parade heating, by electromagnetic induction, low and medium magnetic or non-magnetic tapes thicknesses (of the order of 0.05 to 50 millimeters). She aims more particularly a device for heating by transverse flux induction.
De façon connue, le chauffage au défilé par induction électromagnétique d'une bande métallique est réalisé à l'aide de bobinages qui sont disposés de manière à entourer la bande à chauffer en créant un champ magnétique parallèle à la surface extérieure de cette bande selon la direction de défilement (flux longitudinal, cf. figure 1a). On obtient ainsi une distribution en anneau des courants induits qui parcourent la bande en déplacement continu au niveau de sa surface périphérique, ce qui se traduit par un échauffement dont l'homogénéité de température transversale est généralement considérée comme satisfaisante.In a known manner, heating by induction parade electromagnetic of a metal strip is achieved using windings which are arranged so as to surround the strip to be heated by creating a magnetic field parallel to the outer surface of this strip in the direction of scrolling (longitudinal flow, see Figure 1a). We obtain thus a ring distribution of the induced currents which travel the web in continuous movement at its peripheral surface, which results in overheating whose homogeneity of transverse temperature is generally considered satisfactory.
Lorsqu'il s'agit de chauffer des bandes magnétiques de faible épaisseur, le rendement de ce type de chauffage à flux longitudinal est élevé. Cependant, il chute fortement, pour ces matériaux, dès que l'on dépasse la température du point de Curie (environ 750°C). Ceci est notamment dû au fait que la perméabilité relative du matériau à chauffer décroít rapidement au cours du procédé de chauffage jusqu'à atteindre la valeur de 1 à cette même température. Le rendement est également limité pour les matériaux amagnétiques (acier inoxydable, aluminium ...), quelle que soit la température du produit.When it comes to heating low magnetic tapes thickness, the efficiency of this type of flow heating longitudinal is high. However, it fell sharply, for these materials, as soon as we exceed the point temperature Curie (about 750 ° C). This is mainly due to the fact that the relative permeability of the material to be heated decreases quickly during the heating process until reaching the value of 1 at this same temperature. The yield is also limited for non-magnetic materials (steel stainless steel, aluminum ...), whatever the temperature of the product.
Selon une autre solution connue pour le chauffage au défilé par induction de produits métalliques plats, on dispose deux bobinages de part et d'autre du produit à réchauffer, en regard de chacune des grandes faces de ce dernier de façon à créer un champ magnétique perpendiculaire aux grandes faces du produit selon la technique dite du flux transverse (cf. figure 1b).According to another known solution for parade heating by induction of flat metallic products, there are two windings on either side of the product to be heated, in look of each of the large faces of the latter so as to create a magnetic field perpendicular to large faces of the product according to the so-called transverse flow technique (cf. Figure 1b).
L'inconvénient principal de ce type d'installation réside dans le fait que la distribution en boucle des courants induits par le flux magnétique traversant ne permet généralement pas d'atteindre une homogénéité en température satisfaisante, notamment les extrémités dans le sens de la largeur de la bande (les rives) sont trop ou pas assez chauffées suivant les dimensions relatives des bobinages et du circuit magnétique utilisés par rapport à la largeur de bande.The main drawback of this type of installation is in the fact that the loop distribution of currents induced by the magnetic flux passing through does not allow generally not achieve temperature uniformity satisfactory, especially the ends in the direction of the band width (the edges) are too much or not enough heated according to the relative dimensions of the windings and of the magnetic circuit used in relation to the width of bandaged.
Pour résoudre ce problème, on a déjà proposé d'utiliser un chauffage par induction électromagnétique à flux transverse dans lequel les inducteurs comportent des circuits magnétiques. Ces derniers ont pour but de guider le flux magnétique générés par les bobinages afin d'agir sur la distribution des courants induits.To solve this problem, it has already been proposed to use a electromagnetic induction heating with transverse flux in which the inductors include circuits magnetic. These are intended to guide the flow magnetic generated by the windings in order to act on the distribution of induced currents.
Cependant, de tels dispositifs ont pour désavantage de ne pas être facilement modifiables afin de s'adapter aux largeurs de bande à chauffer. Pour pallier un tel inconvénient, on connaít par exemple un dispositif de chauffage par induction électromagnétique décrit dans le brevet américain n° 4, 678, 883 dans lequel les inducteurs sont constitués d'une pluralité de barrettes magnétiques couplées entre elles (par "couplées", on entend des barrettes qui coopèrent entre elles de façon à ce que le flux magnétique engendré par les inducteurs puisse passer d'une barrette à l'autre barrette), disposées parallèlement à la direction de déplacement de la bande à chauffer et pouvant être individuellement déplacées perpendiculairement à la surface de ladite bande de manière à adapter la distribution de flux à la largeur de la bande, suivant les dimensions de cette dernière.However, such devices have the disadvantage of not be easily modifiable in order to adapt to the widths of heating strip. To overcome such a drawback, we knows for example an induction heater electromagnetic described in American patent n ° 4, 678, 883 in which the inductors consist of a plurality of magnetic strips coupled together (by "coupled" means bars which cooperate with each other so that the magnetic flux generated by the inductors can pass from one bar to the other bar), arranged parallel to the direction of travel of the heating strip which can be individually moved perpendicular to the surface of said strip so as to adapt the flow distribution to the width of the band, according to the dimensions of the latter.
Or, même ce type de chauffage par induction électromagnétique ne permet pas de correctement contrôler les fluctuations de température au niveau des rives de la bande à chauffer. En effet, les barrettes magnétiques en retrait par rapport à ladite bande continuent d'exercer une influence, certes plus faible, sur la distribution de flux magnétique et donc sur la température et il en résulte que la courbe de distribution de température montre une concentration des courants induits sur les rives.Even this type of electromagnetic induction heating does not allow to correctly control the fluctuations of temperature at the edges of the strip to be heated. In effect, the magnetic strips recessed in relation to said band continue to exert influence, certainly more weak, on the magnetic flux distribution and therefore on the temperature and as a result the distribution curve of temperature shows a concentration of the induced currents on riverbanks.
Par ailleurs, on connaít également EP-A-0 667 731 qui divulgue un dispositif de chauffage par induction électromagnétique à flux transverse dans lequel on fait varier la longueur des bobinages afin d'adapter la distribution de flux aux largeurs de bande. Pour ce faire, ce document propose de réaliser ces bobinages en assemblant deux inducteurs opposés en forme de J qui peuvent translater librement dans une direction parallèle à la largeur de bande. Comme pour le brevet américain mentionné ci-dessus, ce dispositif ne permet pas d'obtenir une homogénéité transversale en température très satisfaisante. Furthermore, we also know EP-A-0 667 731 which discloses an induction heater electromagnetic with transverse flux in which one makes vary the length of the windings in order to adapt the flow distribution at bandwidths. To do this, this document suggests making these windings by assembling two opposing J-shaped inductors that can translate freely in a direction parallel to the bandwidth. As with the US patent mentioned above, this device does not allow to obtain a homogeneity transverse temperature very satisfactory.
Compte-tenu des inconvénients des solutions de l'état antérieur de la technique rappelée ci-dessus, la présente invention se propose d'apporter une solution originale en réalisant un dispositif de chauffage par induction électromagnétique à flux transverse dont le circuit magnétique, réalisé par une pluralité de barrettes magnétiques indépendantes, s'adapte à la largeur de la bande à chauffer. Ce dispositif permet ainsi d'améliorer l'homogénéité thermique dans le sens de la largeur de la bande à chauffer.Given the disadvantages of state solutions prior to the technique recalled above, the present invention proposes to provide an original solution in producing an induction heating device electromagnetic with transverse flux whose circuit magnetic, produced by a plurality of bars independent magnetic, adapts to the width of the strip to heat. This device thus improves thermal uniformity across the width of the heating strip.
A cet effet, l'invention apporte un dispositif de chauffage par induction électromagnétique d'une bande métallique défilant dans une direction déterminée comprenant au moins un bobinage électrique disposé en regard d'au moins une des grandes faces de ladite bande afin de chauffer cette dernière par induction à flux magnétique cransverse, chaque bobinage étant associé à au moins un circuit magnétique, chaque circuit étant divisé en une pluralité de barrettes magnétiques non couplées entre elles et disposées parallèlement à la direction de défilement de la bande, ledit dispositif étant caractérisé en ce que ledit circuit magnétique, constitué de ladite pluralité de barrettes, indépendantes les unes des autres, s'adapte à la largeur de la bande à chauffer en écartant ou en rapprochant lesdites barrettes les unes des autres, de manière à adapter en continu la distribution dudit flux magnétique aux dimensions caractéristiques de ladite bande.To this end, the invention provides a heating device by electromagnetic induction of a metal strip scrolling in a specific direction comprising at least one electric winding arranged opposite at least one of large faces of said strip in order to heat the latter by cransverse magnetic flux induction, each winding being associated with at least one magnetic circuit, each circuit being divided into a plurality of bars magnetic not coupled together and arranged parallel to the direction of travel of the strip, said strip device being characterized in that said circuit magnetic, made up of said plurality of bars, independent of each other, adapts to the width of the strip to be heated by spreading or bringing together said bars of each other, so as to adapt in continues the distribution of said magnetic flux to the dimensions characteristics of said strip.
Ainsi, grâce à la présente invention, quelle que soit la largeur de la bande à chauffer, le volume donc le poids du circuit magnétique reste invariable.Thus, thanks to the present invention, whatever the width of the strip to be heated, the volume therefore the weight of the magnetic circuit remains invariable.
Selon une caractéristique avantageuse de l'invention, le dispositif de chauffage par induction électromagnétique comporte également des écrans en matériaux de bonne conductibilité électrique placés dans l'entrefer de part et d'autre de la bande et au niveau des rives de cette dernière, de manière à optimiser l'homogénéité de la température transversale.According to an advantageous characteristic of the invention, the electromagnetic induction heater also includes screens made of good materials electrical conductivity placed in the air gap on both sides and on the other side of the strip and on the banks of the latter, so as to optimize temperature uniformity transverse.
Selon une autre caractéristique avantageuse de l'invention, on donne à la surface du circuit magnétique qui est en regard de l'une des grandes faces de la bande à chauffer un profil "polaire" adapté (bisinusoidal par exemple) par découpage des tôles magnétiques constituant ce circuit de façon à obtenir une meilleure distribution du flux magnétique, et plus particulièrement au niveau des rives de ladite bande. Par profil "polaire", on entend une surface du circuit magnétique qui est courbe dans les trois directions de l'espace.According to another advantageous characteristic of the invention, we give the surface of the magnetic circuit which is opposite of one of the large faces of the strip to heat a profile "polar" adapted (bisinusoidal for example) by cutting out magnetic sheets constituting this circuit so as to obtain better distribution of magnetic flux, and more particularly at the edges of said strip. Through "polar" profile means a surface of the magnetic circuit which is curved in the three directions of space.
D'autres caractéristiques et avantages de la présente invention ressortiront de la description faite ci-après, en référence aux dessins annexés qui en illustrent des exemples de réalisation et d'application dépourvus de tout caractère limitatif. Sur les dessins :
- les figures 1a et 1b illustrent des dispositifs de chauffage par induction électromagnétique connus de l'art antérieur, respectivement à flux longitudinal et flux transverse ;
- les figures 2a et 2b sont des vues partielles, en perspective du dispositif de chauffage par induction selon l'invention dans deux positions ;
- les figures 3a et 3b sont des vues partielles, en perspective du dispositif de la figure 1 muni d'écrans en matériaux de bonne conductibilité électrique couplés à des plots magnétiques ;
- la figure 4 est une vue schématique et partielle d'un exemple de profil polaire (surface du circuit magnétique en regard de la bande à chauffer) ;
- la figure 5 est une vue schématique et partielle d'une installation classique de recuit brillant d'acier inoxydable.
- FIGS. 1a and 1b illustrate electromagnetic induction heating devices known from the prior art, with longitudinal flow and transverse flow respectively;
- Figures 2a and 2b are partial perspective views of the induction heating device according to the invention in two positions;
- Figures 3a and 3b are partial views, in perspective of the device of Figure 1 provided with screens of materials of good electrical conductivity coupled to magnetic pads;
- Figure 4 is a schematic and partial view of an example of a polar profile (surface of the magnetic circuit opposite the strip to be heated);
- Figure 5 is a schematic and partial view of a conventional installation of bright annealing of stainless steel.
Si on se réfère aux dessins, ec plus particulièrement aux
figures 2a et 2b, on voit que le dispositif de chauffage par
induction électromagnétique à flux transverse selon la
présente invention comprend notamment deux armatures
magnétiques respectivement 1 et 1' pourvues d'au moins un
bobinage électrique 2 et disposées face-à-face de part et
d'autre d'une bande 4 à chauffer. Cette dernière peut être
par exemple guidée dans l'entrefer défini entre les circuits
magnétiques à l'aide de rouleaux (non représentés) et ainsi
être transférée dans la zone de chauffage. Son déplacement
est généralement continu lors du procédé de chauffage selon
l'invention.If we refer to the drawings, more particularly
Figures 2a and 2b, it can be seen that the device for heating by
electromagnetic induction with transverse flux according to
present invention includes in particular two frames
1 and 1 'magnetic respectively provided with at least one
electric winding 2 and arranged face to face on the side and
other of a
En variante, et selon l'application désirée de ce dispositif
de chauffage, on peut disposer au moins une armature
magnétique 1 pourvue d'au moins un bobinage électrique 2 en
regard de seulement l'une des grandes faces de la bande 4 à
chauffer.As a variant, and depending on the desired application of this device
heating, you can have at least one frame
magnetic 1 provided with at least one electric winding 2 in
look from just one of the big faces of the
Selon la technique connue dite du flux transverse, le flux magnétique engendré par les bobinages électriques 2 traverse la bande à chauffer 4 et induit dans celle-ci un courant qui circule dans le plan de ladite bande et qui se ferme en boucle au niveau des rives. Pour ce faire, le ou les bobinages 2 sont alimentées à l'aide d'un courant alternatif à fréquence moyenne (par exemple, de l'ordre de 50 à 20000 Hz environ). According to the known technique known as transverse flow, the flow magnetic generated by electrical windings 2 crosspiece the strip to be heated 4 and induces therein a current which circulates in the plane of said strip and which closes in loop at the banks. To do this, the windings 2 are supplied with alternating current at medium frequency (for example, of the order of 50 to 20,000 Hz about).
Pour assurer le guidage du flux magnétique engendré par les
bobinages 2 notamment au niveau des rives de ladite bande, on
dispose un circuit magnétique 6 sur toute ou une partie de la
longueur desdits bobinages. Ce circuit est constitué d'une
pluralité de barrettes magnétiques 8 disposées parallèlement
à la direction de défilement de la bande 4 à chauffer.To guide the magnetic flux generated by the
windings 2 in particular at the edges of said strip,
has a magnetic circuit 6 on all or part of the
length of said coils. This circuit consists of a
plurality of
Selon l'invention, les barrettes 8 composant le circuit
magnétique 6 ne sont pas couplées entre elles et sont
disposées parallèles les unes par rapport aux autres. Ces
barrettes sont donc indépendantes les unes des autres et
elles sont aussi indépendantes des bobinages électriques. En
outre, elles peuvent coulisser à l'aide de moyens 10 au
niveau des bobinages électriques 2 de manière à s'écarter ou
se rapprocher les unes des autres, les bobinages électriques
restant fixes. Ainsi, l'espacement entre deux barrettes
adjacentes peut être agrandi ou rétréci, en continu, sous
l'action desdits moyens 10. Il en résulte que la distribution
de flux magnétique peut être adaptée aux dimensions de la
bande 4, et notamment à sa largeur (cf. figure 2b).According to the invention, the
Cette caractéristique essentielle de la présente invention permet d'obtenir, non seulement un dispositif de chauffage à induction adaptable à différentes largeurs de la bande à chauffer, mais surtout l'homogénéité thermique obtenue dans le sens de la largeur de ladite bande reste optimale quelque soit la largeur de celle-ci.This essential characteristic of the present invention provides not only a space heater induction adaptable to different widths of the belt to heat, but above all the thermal homogeneity obtained in the direction of the width of said strip remains optimal some or the width of it.
En effet, le positionnement spatial des barrettes magnétiques associé à un profil polaire adapté, permettent d'agir sur la circulation des courants induits et donc de maítriser la distribution de température transversale.Indeed, the spatial positioning of the magnetic strips associated with a suitable polar profile, allow to act on the circulation of induced currents and therefore to control the transverse temperature distribution.
Les moyens 10 permettant de faire coulisser, en continu, les
barrettes magnétiques 8 au niveau des bobinages électriques
2, mais sans déplacer ces derniers, sont constitués notamment
par au moins deux rails 11 et 11' parallèles disposés de
chaque côté de la surface de la bande 4 et
perpendiculairement à la direction de déplacement de celle-ci.
Ces rails supportent une pluralité d'armatures 12,
chacune de ces armatures étant fixée à au moins une barrette
8. De préférence, on alterne le support des armatures de deux
barrettes adjacentes sur les deux rails 11 et 11' de manière
à réduire l'encombrement lorsque la largeur du circuit
magnétique 6 est minimale (cas où l'espacement entre les
barrettes est minimal). Les armatures viennent coulisser sur
les rails à l'aide de galets 13 ou analogues de façon
indépendante entre elles ce qui permet un ajustement très
précis, optimal et en continu de la largeur du circuit
magnétique et donc de la distribution de flux. Ainsi, on peut
réaliser par exemple une largeur du circuit magnétique
variant de 800 à 1500 millimètres.The means 10 for sliding, continuously, the
Selon une caractéristique avantageuse de l'invention,
l'espacement entre deux barrettes magnétiques 8 adjacentes
peut être ajusté manuellement ou automatiquement afin
d'obtenir la distribution magnétique souhaitée.According to an advantageous characteristic of the invention,
the spacing between two adjacent
Selon une autre caractéristique avantageuse de l'invention
(cf. figures 3a et 3b), afin d'optimiser l'homogénéité de la
température transversale de la bande à chauffer, on dispose
des écrans 14 dans l'entrefer de part et d'autre de ladite
bande et au niveau des rives de cette dernière. De tels
écrans sont réalisés en matériau possédant une bonne
conductibilité électrique par exemple du type cuivre,
aluminium ou argent. Ils ont pour fonction d'ajuster le flux
magnétique au niveau des rives de la bande afin de maítriser
la température des rives de ladite bande. According to another advantageous characteristic of the invention
(cf. Figures 3a and 3b), in order to optimize the homogeneity of the
transverse temperature of the strip to be heated, there are
De plus, ces écrans sont également fixés sur des armatures 15
supportées par des rails par l'intermédiaire de galets ou
analogues de manière à pouvoir être animés d'un mouvement de
translation suivant la largeur de la bande utilisée. En
variante, on peut également fixer ces écrans directement sur
les barrettes magnétiques d'extrémité qui sont en regard des
rives de la bande à chauffer.In addition, these screens are also fixed on
Selon encore une autre caractéristique avantageuse de
l'invention, on peut également disposer des plots magnétiques
16 sur les armatures 15 supportant les écrans 14 de manière à
affiner la distribution du flux magnétique sur la largeur de
la bande, notamment de tels plots permettent de combler
d'éventuelles hétérogénéités de température. Ces plots
magnétiques 16 peuvent être couplés aux écrans 15 de bonne
conductibilité électrique et/ou aux barrettes magnétiques 8
ou bien être disposés sans écrans.According to yet another advantageous characteristic of
the invention, it is also possible to have
Selon encore une autre caractéristique avantageuse de l'invention (cf. figure 4), on donne à la surface du circuit magnétique 6 de chaque armature (1, 1') qui est en regard de l'une des grandes faces de la bande 4 un profil "polaire", adapté de façon à obtenir une distribution maítrisée du flux magnétique généré par les bobinages électriques 2, en particulier au niveau des rives de ladite bande.According to yet another advantageous characteristic of the invention (cf. Figure 4), the surface of the circuit is given magnetic 6 of each armature (1, 1 ') which is opposite one of the large faces of the strip 4 a "polar" profile, adapted so as to obtain a controlled distribution of the flow magnetic generated by the electrical windings 2, in particularly at the edges of said strip.
Selon encore une autre caractéristique avantageuse de l'invention, on ajoute une spire en court-circuit (non représentée) de part et d'autre du dispositif de chauffage, perpendiculairement aux barrettes du circuit magnétique et enlaçant la bande en déplacement afin de réduire les champs magnétiques de fuite aux extrémités de l'inducteur. According to yet another advantageous characteristic of the invention, a short-circuited turn is added (not shown) on either side of the heating device, perpendicular to the bars of the magnetic circuit and wrapping the moving tape to reduce the fields magnetic leakage at the ends of the inductor.
On décrira maintenant un exemple d'application avantageuse du dispositif de chauffage à induction électromagnétique selon l'invention.We will now describe an example of an advantageous application of the electromagnetic induction heater according to the invention.
La figure 5 représente une vue schématique et partielle d'une
installation de recuit brillant, par exemple d'acier
inoxydable. Une telle ligne de recuit est disposée sur un
seul brin vertical dont la hauteur totale ne doit pas excéder
50 mètres environ. La bande à chauffer 18 qui est guidée par
des rouleaux 19, traverse sur cette hauteur, d'abord une zone
de chauffage 20 puis une zone de refroidissement 21. De façon
connue pou r une bande d'acier non magnétique, celle-ci entre
dans la zone de chauffage à température ambiante (20°C
environ), doit en ressortir à une température de 1150°C et
être ensuite refroidie pour atteindre une température de
100°C en fin de ligne.FIG. 5 represents a schematic and partial view of a
bright annealing plant, for example steel
stainless. Such an annealing line is arranged on a
single vertical strand whose total height must not exceed
50 meters approximately. The
On connaít des dispositifs de chauffage à gaz ou à résistances électriques dont la hauteur sur une telle ligne est de 30 mètres environ ce qui laisse peu de place pour le refroidissement de la bande. En conséquence, de tels dispositifs fonctionnent avec une vitesse de déplacement de la bande à chauffer typiquement de l'ordre de 60 mètres par minute.We know gas or gas heaters electrical resistors whose height on such a line is about 30 meters which leaves little room for the strip cooling. As a result, such devices operate with a travel speed of the strip to be heated typically of the order of 60 meters per minute.
Le dispositif de chauffage par induction électromagnétique selon l'invention appliqué à une telle installation a pour avantage de pouvoir réduire la hauteur d'encombrement de la zone de chauffage jusqu'à 10 mètres environ, ce qui ménage beaucoup plus de place pour le refroidissement et permet ainsi d'atteindre une vitesse de ligne de 120 mètres par minute pour de l'acier inoxydable ayant une épaisseur de 0,5 millimètre environ. The electromagnetic induction heater according to the invention applied to such an installation has for advantage of being able to reduce the overall height of the heating zone up to approximately 10 meters, which saves much more room for cooling and allows thus reaching a line speed of 120 meters per minute for stainless steel with a thickness of 0.5 about a millimeter.
La présente invention telle que décrite précédemment offre donc de multiples avantages. Elle permet à partir d'un dispositif de chauffage par induction électromagnétique utilisant des circuits magnétiques à largeur variable de créer un flux magnétique de forte intensité pour des fréquences moyennes. Cette densité de flux magnétique permet d'atteindre une densité de puissance transmise à la bande à chauffer, supérieure à celle des moyens de chauffage connus. Grâce aux caractéristiques de l'invention, il n'existe pas de matière magnétique dans les espaces inter-barrettes, contrairement aux systèmes selon l'état antérieur de la technique. De plus, le rendement électrique de ce dispositif est supérieur à celui des technologies connues. En outre, un tel dispositif permet d'obtenir une homogénéité thermique satisfaisante dans le sens de la largeur de la bande.The present invention as described above offers therefore multiple advantages. It allows from electromagnetic induction heater using variable width magnetic circuits create a high intensity magnetic flux for medium frequencies. This density of magnetic flux allows achieve a power density transmitted to the band at heating, higher than that of known heating means. Thanks to the characteristics of the invention, there is no magnetic material in the inter-bar spaces, unlike systems according to the prior state of the technical. In addition, the electrical efficiency of this device is superior to that of known technologies. In addition, a such a device makes it possible to obtain thermal homogeneity satisfactory across the width of the strip.
Claims (6)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0005062A FR2808163B1 (en) | 2000-04-19 | 2000-04-19 | TRANSVERSE FLOW INDUCTION HEATING DEVICE WITH MAGNETIC CIRCUIT OF VARIABLE WIDTH |
| FR0005062 | 2000-04-19 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1148762A1 true EP1148762A1 (en) | 2001-10-24 |
| EP1148762B1 EP1148762B1 (en) | 2008-10-08 |
| EP1148762B8 EP1148762B8 (en) | 2008-11-26 |
Family
ID=8849429
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP01400868A Expired - Lifetime EP1148762B8 (en) | 2000-04-19 | 2001-04-04 | Induction heating device having transverse flux and variable width inductor |
Country Status (15)
| Country | Link |
|---|---|
| US (1) | US6498328B2 (en) |
| EP (1) | EP1148762B8 (en) |
| JP (2) | JP2002008838A (en) |
| KR (1) | KR100838092B1 (en) |
| CN (1) | CN1172560C (en) |
| AT (1) | ATE410907T1 (en) |
| AU (1) | AU778739B2 (en) |
| BR (1) | BR0101516A (en) |
| CA (1) | CA2343677C (en) |
| DE (2) | DE1148762T1 (en) |
| ES (1) | ES2173828T3 (en) |
| FR (1) | FR2808163B1 (en) |
| RU (1) | RU2236770C2 (en) |
| TR (1) | TR200201159T3 (en) |
| ZA (1) | ZA200102921B (en) |
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| CN102538034A (en) * | 2010-12-24 | 2012-07-04 | 博西华电器（江苏）有限公司 | Electromagnetic range and magnetic strips thereof |
| WO2015083141A1 (en) * | 2013-12-06 | 2015-06-11 | Fives Celes | Continuous processing line for processing a non-magnetic metal strip including a galvannealing section and method for induction heating of said strip in said galvannealing section |
| EP2800452A4 (en) * | 2011-12-28 | 2015-07-29 | Posco | Heating apparatus and heating method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2045340A1 (en) * | 2007-09-25 | 2009-04-08 | ArcelorMittal France | Comb-shaped laminated cylinder head for an inducer with a magnetic field passing through it for reheating strips of metal |
| WO2009071764A1 (en) * | 2007-09-25 | 2009-06-11 | Arcelormittal France | Comb-like slit laminated yoke for a travelling-magnetic-field inductor for reheating metal strip |
| CN102538034A (en) * | 2010-12-24 | 2012-07-04 | 博西华电器（江苏）有限公司 | Electromagnetic range and magnetic strips thereof |
| EP2800452A4 (en) * | 2011-12-28 | 2015-07-29 | Posco | Heating apparatus and heating method |
| WO2015083141A1 (en) * | 2013-12-06 | 2015-06-11 | Fives Celes | Continuous processing line for processing a non-magnetic metal strip including a galvannealing section and method for induction heating of said strip in said galvannealing section |
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Also Published As
| Publication number | Publication date |
|---|---|
| EP1148762B8 (en) | 2008-11-26 |
| RU2236770C2 (en) | 2004-09-20 |
| US6498328B2 (en) | 2002-12-24 |
| US20020011486A1 (en) | 2002-01-31 |
| DE60136027D1 (en) | 2008-11-20 |
| ZA200102921B (en) | 2001-10-11 |
| FR2808163A1 (en) | 2001-10-26 |
| CA2343677A1 (en) | 2001-10-19 |
| EP1148762B1 (en) | 2008-10-08 |
| CN1326309A (en) | 2001-12-12 |
| DE1148762T1 (en) | 2002-10-02 |
| KR100838092B1 (en) | 2008-06-13 |
| TR200201159T3 (en) | 2002-06-21 |
| JP5280510B2 (en) | 2013-09-04 |
| CA2343677C (en) | 2011-03-08 |
| JP2012099490A (en) | 2012-05-24 |
| AU778739B2 (en) | 2004-12-16 |
| KR20010098646A (en) | 2001-11-08 |
| CN1172560C (en) | 2004-10-20 |
| ATE410907T1 (en) | 2008-10-15 |
| BR0101516A (en) | 2001-11-20 |
| ES2173828T1 (en) | 2002-11-01 |
| JP2002008838A (en) | 2002-01-11 |
| FR2808163B1 (en) | 2002-11-08 |
| ES2173828T3 (en) | 2009-04-01 |
| AU3341701A (en) | 2001-10-25 |
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