EP2497333B1 - Dispositif de chauffage par induction de pièces constituées d'un matériau électroconducteur - Google Patents

Dispositif de chauffage par induction de pièces constituées d'un matériau électroconducteur Download PDF

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Publication number
EP2497333B1
EP2497333B1 EP10771743.1A EP10771743A EP2497333B1 EP 2497333 B1 EP2497333 B1 EP 2497333B1 EP 10771743 A EP10771743 A EP 10771743A EP 2497333 B1 EP2497333 B1 EP 2497333B1
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Prior art keywords
coil
induction
winding segments
usable
windings
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EP10771743.1A
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German (de)
English (en)
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EP2497333A1 (fr
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Helmut K. Bauer
Martin U. Bauer
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—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
    • 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 invention relates to a device for inductive heating preferably over a moving distance moving workpieces of electrically conductive material having at least one acted upon by alternating current, a plurality of turns of coil wire having induction coil of the type specified in the preamble of claims 1 and 11.
  • a coil wire through which current flows is surrounded by an annular magnetic field.
  • the fields of the individual turns overlap to form a common magnetic field.
  • the course of the magnetic field can be described model by way of the visual aid of the field lines.
  • the field lines indicate the direction of force that would act on an external north pole.
  • the field lines emerge from the north pole, are directed in the outer space in the direction of the south pole, reenter the coil at the south pole and are closed via the interior of the coil.
  • the magnetic poles thereby depict the regions of the largest magnetic flux from which the magnetic field exits or enters into the outer space.
  • the number of field lines is a scaling question. A greater density of field lines occupies a larger magnetic field and vice versa.
  • the field lines in a coil extend transversely to the direction of current in the windings, essentially parallel to the surface defined by the adjacent windings.
  • For the inductive heating of an electrically conductive workpiece is by the excitation of the coil with a high-frequency alternating current magnetic alternating field generated.
  • a time-varying magnetic field in turn induces an electric field whose field lines close around the magnetic field lines.
  • This electric field induces voltages and thereby currents that occur in an electrically conductive workpiece in the form of eddy currents.
  • the eddy currents lead by the ohmic resistance to a heating of the workpiece.
  • these eddy currents again generate magnetic fields which lead to a frequency-dependent field displacement of the electromagnetic fields from the interior of the workpiece into the edge regions. This so-called skin effect ultimately leads to a concentration of the fields in a small boundary layer on the outer surface of the workpiece.
  • the coil windings often have a more or less complete return of magnetically conductive material. This inference serves to guide the flow and to shield certain areas from the magnetic fields.
  • the magnetic field concentrates on the magnetically conductive areas of the flux guide and bridges the air space in air gaps or in scattered areas.
  • induction device of the type specified above known ( US 2,052,010 . DE-297 00 645 U1 ), in which the windings of the induction coil have at least one group of selected winding sections, which are arranged parallel to one another by clamping a useful induction surface facing the workpiece to be heated and current flows through in the same direction and which are connected to one another via further winding sections.
  • the usable induction surface is to be understood as an area defined by the group of selected winding sections, in whose adjoining air space the magnetic field lines used for heating the workpiece run. This makes it possible with simple means to adapt the induction coil structurally to workpieces with a complicated design.
  • the present invention seeks to improve a device for inductive heating of workpieces of the type specified in that the efficiency increases in the range of usable induction area and unacceptable heatings are avoided in the outdoor area.
  • the solution according to the invention consists in that the winding sections are connected to form a spiral winding and enclose an open air space and that the group of selected winding sections is at least partially bounded on its outside of the usable induction surface with magnetically conductive flux guide means.
  • a preferred embodiment of the invention provides that the induction coil has two groups of selected winding sections, whose usable induction surfaces face each other in mutual lateral distance and together define a gap-shaped air space for receiving the workpieces to be heated.
  • the selected turn sections and the other turn sections in an imaginary unfolded blank form a flat rectangular spiral with a central rectangular opening, the adjacent turn sections of each turn at the ends of the sides of the rectangle to form a common miter line by 90 ° are bent against each other.
  • the two groups of selected winding sections forming the usable induction surface are together with the miter lines and a part of the groups of the further turns sections around a bending line parallel to the selected turn sections and extending transversely to the further turn sections, from the imaginary cut plane.
  • the bending line expediently extends at a distance from the opening edge and parallel to it through the central opening.
  • a special feature of this design is also that the other turns sections on their side facing the inside of the gap can span additional usable, the induction surfaces to be heated facing the workpiece.
  • the gap inductor described above is preferably used for paint stripping or decoating of coated metallic workpieces in a continuous process.
  • the movement distance of the workpieces is expediently aligned parallel to the longer rectangular sides of the coil turns.
  • a further embodiment variant of the invention provides that the turns of the induction coil are helically wound on an outline rectangular coil frame having two transverse sides and two longitudinal sides such that the adjacent turns in the transverse direction of the coil frame are juxtaposed and extend in its longitudinal direction, that of the coil frame comprising at its ends by Spulpole limited coil core of magnetically conductive material and that the further Windungsabitese are limited at their side facing away from the coil core outside at least partially with magnetically conductive guide means.
  • the width of the coil frame corresponding to the transverse dimension of the usable induction surface is smaller than the length of the coil frame corresponding to the longitudinal dimension of the usable induction surface.
  • the induction coil has one or more winding layers at least within the usable induction area.
  • Such an induction coil forms a Flachinduktor whose winding poles are not assigned to the effective induction surface. Rather, the effective induction surface is formed by one of the broad side surfaces of the flat inductor, along which the workpiece to be heated is moved. The speed of movement of the workpiece is selected such that the heating process provided on the workpiece is completed when it leaves the area of action of the usable induction surface.
  • a particular field of application for a flat inductor is the sealing of overlapping and butt welds on metallic sheet metal bodies, in particular on cylindrical tin cans which are sealed on a jacket seam.
  • the sealing takes place there by the seams being inductively heated by passing the metallic sheet metal bodies past the usable induction surface and being coated with a melting-on coating agent.
  • the meltable coating agent can be arranged either on the outside or on the inside of the seam.
  • the devices shown in the drawing are intended for inductive heating of preferably along a moving distance moving workpieces made of electrically conductive material. They are also referred to below as the "inductor”.
  • the Fig. 1 shows a so-called gap inductor 10, the housing 12 has an upwardly open longitudinal gap 14 which is bounded by two side edges 16 and a bottom 18. Inside the housing 12 there is at least one adapted to the housing 12 induction coil 20,20 ', which is acted upon by an alternating current and generates a high-frequency magnetic alternating field B, the field lines 22 in Fig. 1 are shown partially.
  • the alternating magnetic field B can be used to induce induction currents in a workpiece positioned in the gap 14, which causes the workpiece to reach a predetermined temperature heat.
  • the exciting current which has a frequency in the order of 10 to 100 kHz, is generated by a generator, not shown in the drawing.
  • a generator not shown in the drawing.
  • a blower 26 can be seen, via which cooling air is sucked into the housing and routed through channels 28 provided therein for cooling the induction coil 20, 20 'and, in the heated state, is blown off again into the exterior space via housing openings 30.
  • the induction coils 20, 20 'intended for the gap inductor 10 are in the Fig. 2 to 5b shown.
  • Each induction coil 20,20 ' has a plurality of turns 32 of coil wire, which is preferably formed as Hochfrequenzlitze because of the high excitation frequency.
  • the windings 32 of the induction coils 20, 20 ' have two groups of selected turn sections 34, 34' arranged in the region of the side flanks 16 of the housing 12, which are arranged parallel next to each other while being tensioned in each case on a usable induction surface 36, 36 'facing the longitudinal gap 14 the same direction are flowed through and are connected via further winding sections 38,38 ', 40 in the manner of a spiral winding with each other and enclose an open air space 42.
  • a usable induction surface 36, 36 ' is to be understood as a surface spanned by a group of winding sections, in whose adjoining air space the magnetic field lines 22 used for heating the workpiece 24 run.
  • the usable induction surfaces 36, 36 'of the selected turn sections 34, 34' face each other at a mutual lateral distance and together define a gap-shaped air space 14 ', which comprises the longitudinal gap 14 in the housing 12 and is aligned parallel thereto.
  • the groups of selected turn sections 34, 34 'forming the two usable induction faces 36, 36' and part of the groups of the further turn sections 38, 38 ' are parallel to the turn sections 34, 34' and transverse to the other turn sections 38.38 'extending bending line 48 bent from the imaginary cut plane 50 by about 90 ° to one side.
  • the bending line 48 extends at a distance from the opening edge 46 through the central opening of the open air space 42 therethrough.
  • the further winding sections 40 delimit at the two ends of the induction coil 20, 20 'a bottom area parallel to the bottom 18 of the longitudinal gap 14 in the region of the imaginary cut plane 50.
  • FIG. 1 partially drawn field lines 22 of the alternating magnetic field B are generated by the usable induction surfaces 36,36 '.
  • a peculiarity of in Fig. 2 to 5b shown embodiments is that also the other turn sections 38,38 'and 40 on its side facing the inside of the gap additional, the usable heat to the workpiece 24 facing usable induction surfaces.
  • the field lines in accordance with the direction of current in the other winding sections 38,38 ', 40 in the sense of the Merkreg stated above.
  • the group of selected turns sections 34, 34 ' are limited on their outer side facing away from the usable induction surface 36, 36' with magnetically conductive flux guiding means 52 made of ferromagnetic material with electrically insulating properties.
  • a further improvement in this regard is achieved in that the other flux guide means 38, 38 'and 40 are also partially delimited on their outside remote from the air space 14' by magnetically conductive flux guiding means 54, 56.
  • the flux guiding means 52, 54, 56 are preferably made of a ferritic material or of ferromagnetic composite materials which are magnetically conductive and have electrically insulating properties. This ensures that they do not heat up under the influence of the alternating magnetic field by eddy current formation.
  • Fig. 4 shown embodiment differs from the exemplary embodiment Fig. 3 in that the gap inductor has two induction coils 20, 20 'arranged inside the housing 12, whose windings are electrically connected in series via the cable 60.
  • This arrangement has the advantage that, in the case of particularly long gap inductors, the winding work is simplified and that an additional optimization and adaptation of the winding to the workpiece to be heated is made possible.
  • a further embodiment of the Spaltinduktors is shown, which differs from the embodiment according to Fig. 3 characterized in that the winding density in the different winding sections 34,38 is different.
  • the windings 32 are densely packed, while in the groups of winding sections 38 and 40, the windings 32 are spaced apart.
  • the gap inductor according to Fig. 1 to 5b is preferably used for decoating or paint stripping of coated metallic workpieces in a continuous process.
  • the Fig. 6 to 9 show a modified embodiment of an intended for heating workpieces induction device, which is designed as Flachinduktor 110.
  • the flat inductor comprises a rectangularly elongated cuboid housing 112, in which an induction coil 120 is arranged.
  • the induction coil 120 has the geometry of an elongated flat rectangular coil. It generates a field of field 122 corresponding alternating field B in a workpiece receiving area, which is arranged in the air space 125 above the upper cover of the housing 142.
  • the windings 132 of the induction coil 120 are wound helically on an outline rectangular coil frame 116 with a short rectangular side 129 and a long rectangular side 130.
  • the adjacent windings 132 lie in the transverse direction of the coil frame 116 next to each other.
  • the group of upwardly facing selected turn portions 134 span a usable induction surface 136 facing the upper air space 125.
  • the selected Windungsabête 134 are connected to each other via the other winding sections 138 and 140 in the manner of a helical winding and enclose a limited at its ends by winding poles 114 spool core 142 of magnetically conductive material.
  • the plate-shaped coil frame 116 is mounted on the wall of the housing 112.
  • the housing 112 has a first plate 113 and a second plate 114 each made of temperature-resistant insulating material. Between the plates 113 and 114, a cooling channel 115 is formed, and is supplied via the fan 126 with cooling air, which is open via the air gap 117 to the outside.
  • the inductance coil is limited at its poles 144 to the housing wall with magnetically conductive electrically insulating flux guide means 152.
  • the flux guide means 152 forming a type of pole disk may consist of ferritic material or of ferromagnetic composite materials.
  • Further flux guidance means 154 can also be arranged on the internal broad side of the induction coil 120.
  • a special field of application for the flat inductor is the sealing of overlap and butt welds 123 on metallic sheet metal bodies 124 (FIG. Fig. 9 ), in particular on cylindrical tin cans, which are sealed at a jacket seam.
  • the inductive heating is effected there by the metallic sheet metal bodies with their seams coated with a melting coating material being moved past the usable induction surface 136 in the workpiece receiving area.
  • the invention relates to a device for inductive heating of preferably along a moving distance moving workpieces of electrically conductive material having at least one acted upon by alternating current, a plurality of turns of coil wire having induction coil 20,120.
  • the turns 32, 132 of the induction coil 20, 120 have at least one group of selected turn sections 34, 34 ', 134, which, under tensioning, can be used for a workpiece to be heated Induction surface 36, 36 '; 136 are arranged parallel next to one another and current flows through in the same direction, and which are connected to one another via further winding sections 38, 38', 40, 138, 140 in the manner of a spiral or helical winding and an open air space 42 or with magnetic enclosing coil core 142 equipped conductive flux guide.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Induction Heating (AREA)

Claims (16)

  1. Dispositif de chauffage par induction de pièces (24) en un matériau électriquement conducteur, comprenant au moins une bobine d'induction (20) sollicitée par un courant alternatif et présentant une pluralité d'enroulements de fil de bobine, les enroulements (32) de la bobine d'induction (20) présentant au moins un groupe de parties d'enroulement sélectionnées (34, 34') qui sont disposées parallèlement les unes à côté des autres en étant tendues sur une surface d'induction utile (36, 36') tournée vers la pièce à chauffer et qui sont parcourues par le courant dans le même sens, et qui sont connectées les unes aux autres en formant un enroulement spiralé par le biais d'autres parties d'enroulement (38, 38', 40) et entourent un espace libre ouvert (42), caractérisé en ce que le groupe de parties d'enroulement sélectionnées (34, 34') est limité au niveau de son côté extérieur opposé à la surface d'induction utile au moins en partie par des moyens de guidage de flux magnétiquement conducteurs (52).
  2. Dispositif selon la revendication 1, caractérisé en ce que les autres parties d'enroulement (38, 38', 40) sont limitées au niveau de leur côté extérieur opposé à l'espace libre (42) au moins en partie par des moyens de guidage de flux magnétiquement conducteurs (54, 56).
  3. Dispositif selon la revendication 1 ou 2, caractérisé en ce que la bobine d'induction présente deux groupes de parties d'enroulement sélectionnées (34, 34'), dont les surfaces d'induction utiles (36, 36') sont tournées l'une vers l'autre à une distance latérale mutuelle et délimitent ensemble un espace libre en forme de fente (14') pour recevoir les pièces à chauffer (24).
  4. Dispositif selon la revendication 3, caractérisé en ce que les parties d'enroulement sélectionnées (34, 34') et les autres parties d'enroulement (38, 38', 40) forment, dans une pièce découpée imaginaire repliée, une spirale rectangulaire plane avec une ouverture rectangulaire centrale (42), et en ce que les parties d'enroulement mutuellement adjacentes de chaque enroulement (32) sont cintrées l'une par rapport à l'autre à chaque fois de 90° aux extrémités des côtés du rectangle associés en formant une ligne d'onglet commune (44).
  5. Dispositif selon la revendication 3 ou 4, caractérisé en ce que les deux groupes de parties d'enroulement sélectionnées (34, 34') formant les surfaces d'induction utiles (36, 36'), dans leur état redressé, conjointement avec les lignes d'onglet et une partie des groupes des autres parties d'enroulement (38, 38'), sont coudés hors du plan imaginaire de la pièce découpée (50) suivant une ligne de flexion (48) parallèle aux parties d'enroulement sélectionnées (34, 34') et s'étendant transversalement aux autres parties d'enroulement (38, 38').
  6. Dispositif selon la revendication 5, caractérisé en ce que la ligne de flexion (48) s'étend à distance du bord de l'ouverture à travers l'ouverture centrale (42).
  7. Dispositif selon la revendication 5 ou 6, caractérisé en ce que les autres parties d'enroulement (38, 38') sont tendues sur leur côté tourné vers l'intérieur de la fente (14') sur des surfaces d'inductions utiles supplémentaires.
  8. Dispositif selon l'une quelconque des revendications 4 à 7, caractérisé en ce qu'à chaque fois deux côtés du rectangle mutuellement opposés (46) à l'intérieur de la surface d'induction utile sont plus longs que les deux autres côtés du rectangle.
  9. Dispositif selon la revendication 8, caractérisé en ce que les groupes des parties d'enroulement sélectionnées sont recourbés conjointement avec les lignes d'onglet (44) de sensiblement 90° vers un côté et délimitent, avec leurs surfaces d'induction utiles tournées l'une vers l'autre (36, 36') ainsi qu'une partie des autres parties d'enroulement (38, 38') se raccordant aux lignes d'onglet (44), l'espace libre en forme de fente (14').
  10. Dispositif selon l'une quelconque des revendications 1 à 9, caractérisé en ce que les enroulements (32) à l'intérieur des surfaces d'induction utiles (36, 36') présentent des espacements au moins en partie différents les uns des autres.
  11. Dispositif de chauffage par induction de pièces (124) en un matériau électriquement conducteur, comprenant au moins une bobine d'induction (120) sollicitée par un courant alternatif et présentant une pluralité d'enroulements de fil de bobine, les enroulements (132) de la bobine d'induction (120) présentant au moins un groupe de parties d'enroulement sélectionnées (134) qui sont disposées parallèlement les unes à côté des autres en étant tendues sur une surface d'induction utile (136) tournée vers la pièce à chauffer et qui sont parcourues par le courant dans le même sens, et qui sont connectées les unes aux autres par le biais d'autres parties d'enroulement (138, 140), caractérisé en ce que les enroulements (132) de la bobine d'induction (120) sont enroulés sous forme hélicoïdale sur un cadre de bobine (136) de pourtour rectangulaire avec deux côtés transversaux (129) et deux côtés longitudinaux (130), en ce que les enroulements mutuellement adjacents (132) sont situés les uns à côté des autres dans la direction transversale du cadre de bobine (116), et s'étendent dans la direction longitudinale de celui-ci, en ce que le cadre de bobine (116) comprend un noyau de bobine (142) en matériau magnétiquement conducteur limité au niveau de ses extrémités par des pôles de bobine (144) et en ce que les autres parties d'enroulement (138, 140) sont limitées au niveau de leur côté extérieur opposé au noyau de bobine (142) au moins en partie par des moyens de guidage de flux magnétiquement conducteurs (154).
  12. Dispositif selon la revendication 11, caractérisé en ce que la largeur du cadre de bobine (116) correspondant à la dimension transversale de la surface d'induction utile (132) est inférieure à la longueur du cadre de bobine (116) correspondant à la dimension longitudinale de la surface d'induction utile.
  13. Dispositif selon l'une quelconque des revendications 1 à 12, caractérisé en ce que la bobine d'induction (20 ; 120) présente au moins à l'intérieur des surfaces d'induction utiles une ou plusieurs couches d'enroulement.
  14. Utilisation du dispositif selon l'une quelconque des revendications 1 à 13 pour le décapage ou le dévernissage de pièces métalliques revêtues (24) dans un procédé continu.
  15. Utilisation du dispositif selon l'une quelconque des revendications 1 à 13 pour l'étanchéité de joints de chevauchement et d'aboutement au niveau de corps en tôle métalliques, les joints (123) étant chauffés par induction en faisant passer les corps en tôle (124) devant la surface d'induction utile (136) et étant ainsi revêtus d'un moyen de revêtement fondant.
  16. Utilisation selon la revendication 15, caractérisé en ce que les corps en tôle (124) sont réalisés sous forme de boîtes en tôle cylindriques qui sont étanchéifiées au niveau d'un joint périphérique (123).
EP10771743.1A 2009-11-04 2010-10-29 Dispositif de chauffage par induction de pièces constituées d'un matériau électroconducteur Active EP2497333B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL10771743T PL2497333T3 (pl) 2009-11-04 2010-10-29 Urządzenie do indukcyjnego nagrzewania przedmiotów obrabianych z przewodzącego prąd materiału

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009046411A DE102009046411A1 (de) 2009-11-04 2009-11-04 Vorrichtung zum induktiven Aufheizen von Werkstücken aus elektrisch leitfähigem Material
PCT/EP2010/066433 WO2011054747A1 (fr) 2009-11-04 2010-10-29 Dispositif de chauffage par induction de pièces constituées d'un matériau électroconducteur

Publications (2)

Publication Number Publication Date
EP2497333A1 EP2497333A1 (fr) 2012-09-12
EP2497333B1 true EP2497333B1 (fr) 2014-02-26

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EP10771743.1A Active EP2497333B1 (fr) 2009-11-04 2010-10-29 Dispositif de chauffage par induction de pièces constituées d'un matériau électroconducteur

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EP (1) EP2497333B1 (fr)
DE (1) DE102009046411A1 (fr)
ES (1) ES2464766T3 (fr)
PL (1) PL2497333T3 (fr)
WO (1) WO2011054747A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024100665A1 (fr) * 2022-11-09 2024-05-16 Magnus Metal Ltd. Système de chauffage basé sur un concentrateur de flux magnétique à anneau ouvert

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2052010A (en) * 1934-08-04 1936-08-25 Chrysler Corp Induction heating apparatus
US2419116A (en) * 1944-04-20 1947-04-15 Westinghouse Electric Corp Apparatus for high-frequency induction heating of strips
GB715714A (en) * 1951-06-22 1954-09-22 Deutsche Edelstahlwerke Ag Improvements in and relating to induction heating apparatus
US3005893A (en) * 1959-01-19 1961-10-24 Westinghouse Electric Corp Heating method and apparatus
DE1287233B (de) * 1965-12-24 1969-04-30 Aeg Elotherm Gmbh Mehrwindiger Induktor
DE1951161B2 (de) * 1969-10-10 1973-04-19 Industrie Werke Karlsruhe Augsburg AG, 7500 Karlsruhe Abschirmvorrichtung an elektroden, die hochfrequenz-energie auf induktivem wege uebertragen bzw. zufuehren
GB1327280A (en) * 1969-12-10 1973-08-22 Tetra Pak Int Method of and means for sealing packaging material
US3824367A (en) * 1973-08-13 1974-07-16 Park Ohio Industries Inc Inductor for inductively heating a rotating workpiece
DE29700645U1 (de) * 1997-01-15 1997-05-07 Raychem Ltd., Swindon, Wiltshire Elektromagnetische Induktionsspule

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WO2011054747A1 (fr) 2011-05-12
ES2464766T3 (es) 2014-06-04
PL2497333T3 (pl) 2014-11-28
EP2497333A1 (fr) 2012-09-12
DE102009046411A1 (de) 2011-05-05

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