EP0495780A1 - Coil body for the inductive heating of rollers. - Google Patents

Coil body for the inductive heating of rollers.

Info

Publication number
EP0495780A1
EP0495780A1 EP90910553A EP90910553A EP0495780A1 EP 0495780 A1 EP0495780 A1 EP 0495780A1 EP 90910553 A EP90910553 A EP 90910553A EP 90910553 A EP90910553 A EP 90910553A EP 0495780 A1 EP0495780 A1 EP 0495780A1
Authority
EP
European Patent Office
Prior art keywords
front surface
coil body
coil
cooling
roller
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP90910553A
Other languages
German (de)
French (fr)
Other versions
EP0495780B1 (en
Inventor
Bernhard Brendel
Werner Borkenhagen
Bernhard Funger
Stefan Krebs
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eduard Kuesters Maschinenfabrik GmbH and Co KG
Original Assignee
Eduard Kuesters Maschinenfabrik GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Eduard Kuesters Maschinenfabrik GmbH and Co KG filed Critical Eduard Kuesters Maschinenfabrik GmbH and Co KG
Publication of EP0495780A1 publication Critical patent/EP0495780A1/en
Application granted granted Critical
Publication of EP0495780B1 publication Critical patent/EP0495780B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • H05B6/14—Tools, e.g. nozzles, rollers, calenders
    • H05B6/145—Heated rollers
    • 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 invention relates to a bobbin which corresponds to the preamble of claim 1.
  • Such a coil former is known from EP-OS 59 421.
  • the inductive heating of rollers serves to increase the temperature of the roller surface in order to be able to carry out the pressure treatment of the web material treated by the roller at a higher temperature, for example to be able to calender a paper web at a higher temperature.
  • a large number of bobbins of the type in question are arranged side by side along the roll surface, which raise the overall temperature level, but can also be controlled separately in order to set a specific temperature profile. be it because the paper web requires a temperature increase at a certain point, be it to increase the roll diameter and thus the line pressure at the relevant point by means of a local temperature increase.
  • the coil formers are only shown schematically in EP-OS 59 421. In practice, they consist of a plastic block, the front of which is geometrically adapted to the circumference of the roller, ie is partially cylindrical. Tight Below the partially cylindrical front surface, the actual coil is embedded in the plastic block, which consists of a strand with many individual wires, which has an approximately rectangular cross section. The strand is wound into a spiral, the cross section standing upright. The spiral extends in a partially cylindrical area in the plastic block. It faces the roller surface without contact and at a short distance.
  • This coil is loaded at a medium frequency, for example in the range from 15 to 18 kHz. Because of this relatively high frequency, the coil wire must be configured as a strand with individual enamel-insulated wires. The coil is connected to an oscillating circuit, the voltage of which is approximately 800 volts.
  • the object of the invention is to make a bobbin of the generic type suitable for higher working temperatures. _ - _
  • the result of the cooling element is that the temperature of the front surface of the plastic carrier can be kept so low that no destruction takes place and the higher temperatures on the roller surface can be endured for long periods of time. Tests have shown perfect operation over 42 hours.
  • the cooling element is formed by a cooling chamber through which a fluid cooling medium can flow.
  • the fluid cooling medium not only has the function of dissipating heat from the area of the front surface of the plastic carrier, but at the same time keeps the radiation emanating from the roller surface away from this front surface.
  • the heat output to be dissipated is about 100 watts for a commercially available coil body of normal size, which can be achieved by a fluid cooling medium even without a large throughput.
  • cooling chamber can be designed according to claim 3.
  • the preferred cooling medium is water (claim 4).
  • DE-PS 34 38 375 shows that an inductive conductor of cooling water can flow through. In the known embodiment, however, it is only a conductor loop made from a solid copper tube. However, the invention relates to a higher power concentration, which makes higher frequencies and higher number of turns necessary and in which a direct flow through the individual conductor is no longer feasible.
  • An important embodiment of the invention is to design the boundary surface of the cooling element facing the roller to increase reflection (claim 5).
  • the reflection element of the cooling element cannot be increased by metallization or by attaching metallic mirror elements, because these are subject to the induction effect and would also be heated. Rather, it is necessary to increase the degree of whiteness and glossiness flexionshunt highest possible re ", ie the highest possible ratio herbeizu ⁇ lead to the incident amount of radiation reflected.
  • FIG. 1 shows a side view of a bobbin arranged on a roller surface, partly in section
  • FIG. 2 shows a view according to FIG. 1 from the left along the line II-II in FIG. 1;
  • FIG. 3 shows a partial cross section along the line III-III in FIG. 2.
  • the coil body designated 100 as a whole in FIG. 1 comprises a plastic carrier 1 in the form of a cuboid block with a partially cylindrical front surface 2 which is adapted to the outer circumference 3 of a rotating roller 4, i.e. is coaxial.
  • the revolving roller 4 is shown as a hollow roller made of steel, which extends lengthways from an unillustrated crosshead and is supported from the inside on the non-rotatable crosshead by means of hydraulic support devices.
  • an induction coil 5 shown only in its outline in FIG. 1, the axis of which is perpendicular to the roller surface and which runs spirally in a partially cylindrical region 6 that is coaxial with the front surface 2 or the circumference of the roller 3.
  • the coil wire 7 is formed by a strand 8 with a large number of individual wires 9 which are insulated from one another.
  • the cross section of the coil wire 7 is rectangular, the length of the rectangle being a multiple of the width. As can be seen from Fig. 3 stands _ c
  • the coil wire is upright, i.e. with the longer cross-sectional rectangle sides perpendicular to the roller circumference 3.
  • the "plan" of the coil 5 can be seen in FIG. 2 and is indicated by the course of the center line 10 of the coil wire 7.
  • the coil wire 7 runs with its center line 10 from the feed line 11 along a rectangular (adapted to the cross section of the plastic carrier 1) spiral path from the feed line 11 to the return line 12 and thus forms a spiral coil with six turns in the exemplary embodiment .
  • the coil 5 is cast into the material of the plastic carrier 1.
  • the front surface 2 of the plastic carrier is cast into the material of the plastic carrier 1.
  • front of the front surface 2 is a flat surface designated as a whole by 20, the front surface
  • cooling element which is designed as a cooling chamber 13 through which cooling water 14 flows.
  • the cooling chamber 13 is delimited by a web 15 which surrounds the front surface 2 and on which a cover 16 in the form of a thin plastic sheet, for example 1 mm thick, is tightly applied, so that the cooling chamber 13 except for the inlet 17 and the Process 18 is closed. Since the circumferential web 15 all around a constant height of, for example
  • the cover 16 automatically assumes a shape adapted to the roller circumference 3 and is opposite the roller circumference 3 during operation with the smallest possible distance.
  • the height of the chamber 13 should be as low as possible be so that the coil 5 can be moved as close as possible to the roller circumference 3 despite the presence of the cooling element 20, which accommodates the efficiency of the inductive heating by the coil 5.
  • the surface of the sheet-shaped cover 16 of the cooling chamber 13 facing the roller periphery 3 is white and shiny in order to reflect as large a portion of the heat radiated from the roller periphery 3 as possible.

Abstract

Une bobine inductive (5) pour le chauffage d'un cylindre tournant (4) est logée dans un support en plastique (1). Pour le refroidissement du support en plastique (1) à proximité de la bobine (5) est prévu, sur la face avant (2) du support en plastique du côté circonférence du cylindre (3), un élément de refroidissement (20) se présentant sous la forme d'une chambre de refroidissement plate (13) traversée par un fluide réfrigérant.An inductive coil (5) for heating a rotating cylinder (4) is housed in a plastic holder (1). For cooling the plastic support (1) near the spool (5), a cooling element (20) is provided on the front side (2) of the plastic support on the circumferential side of the cylinder (3). in the form of a flat cooling chamber (13) through which a refrigerant fluid passes.

Description

Spulenkörper für die induktive Beheizung von Walzen Coil formers for the inductive heating of rolls
Die Erfindung bezieht sich auf einen Spulenkörper der dem Oberbegriff des Anspruchs 1 entsprechenden Art.The invention relates to a bobbin which corresponds to the preamble of claim 1.
Ein solcher Spulenkörper ist aus der EP-OS 59 421 bekannt. Die induktive Beheizung von Walzen dient dazu, die Temperatur der Walzenoberfläche zu erhöhen, um die Druckbehandlung des von der Walze behandelten Bahnmate¬ rials bei höherer Temperatur durchführen zu können, bei¬ spielsweise eine Papierbahn bei höherer Temperatur kalan- drieren zu können. Es sind zu diesem Zweck längs der Wal¬ zenoberfläche dicht nebeneinander eine ganze Anzahl von Spulenkörpern der in Rede stehenden Art Seite an Seite angeordnet, die das Temperatu-rniveau insgesamt anheben, aber auch separat angesteuert werden können, um ein be¬ stimmtes Temperaturprofil einzustellen, sei es, weil die Papierbahn an einer bestimmten Stelle eine Temperatur¬ erhöhung verlangt, sei es, um durch eine lokale Tempera¬ turerhöhung den Walzendurchmesser und damit den Linien¬ druck an der betreffenden Stelle zu erhöhen.Such a coil former is known from EP-OS 59 421. The inductive heating of rollers serves to increase the temperature of the roller surface in order to be able to carry out the pressure treatment of the web material treated by the roller at a higher temperature, for example to be able to calender a paper web at a higher temperature. For this purpose, a large number of bobbins of the type in question are arranged side by side along the roll surface, which raise the overall temperature level, but can also be controlled separately in order to set a specific temperature profile. be it because the paper web requires a temperature increase at a certain point, be it to increase the roll diameter and thus the line pressure at the relevant point by means of a local temperature increase.
Die Spulenkörper sind in der EP-OS 59 421 nur sche¬ matisch dargestellt. Sie bestehen in der Praxis aus einem Kunststoffblock, dessen Vorderseite dem Umfang der Walze geometrisch angepaßt, d.h. teilzylindrisch ist. Dicht unterhalb der teilzylindrischen Vorderfläche ist in den Kunststoffblock die eigentliche Spule eingebettet, die aus einer Litze mit vielen Einzeldrähten besteht, die einen etwa rechteckigen Querschnitt hat. Die Litze ist zu einer Spirale gewickelt, wobei der Querschnitt hochkant steht. Die Spirale erstreckt sich in einem teilzylindri¬ schen Bereich in dem Kunststoffblock. Sie steht der Walzen¬ oberfläche berührungsfrei mit geringem Abstand gegenüber.The coil formers are only shown schematically in EP-OS 59 421. In practice, they consist of a plastic block, the front of which is geometrically adapted to the circumference of the roller, ie is partially cylindrical. Tight Below the partially cylindrical front surface, the actual coil is embedded in the plastic block, which consists of a strand with many individual wires, which has an approximately rectangular cross section. The strand is wound into a spiral, the cross section standing upright. The spiral extends in a partially cylindrical area in the plastic block. It faces the roller surface without contact and at a short distance.
Die Beschickung dieser Spule erfolgt mit Mittelfrequenz beispielsweise im Bereich von 15 bis 18 kHz. Wegen dieser relativ hohen Frequenz ist die Ausbildung des Spulendrahts als Litze mit einzelnen lackisolierten Drähten erforder¬ lich. Die Spule ist an einen Schwingkreis angeschlossen, dessen Spannung etwa 800 Volt beträgt.This coil is loaded at a medium frequency, for example in the range from 15 to 18 kHz. Because of this relatively high frequency, the coil wire must be configured as a strand with individual enamel-insulated wires. The coil is connected to an oscillating circuit, the voltage of which is approximately 800 volts.
Mit Spulen dieser Art wurden bisher Temperaturen an der Oberfläche der meist aus Stahl bestehenden Walzen im Bereich von etwa 160° C gefahren. Die Bestrebungen gehen neuerdings aber dahin, die Temperatur an der Ober¬ fläche der Walze auf etwa 250 C zu erhöhen.So far, coils of this type have been used to drive temperatures on the surface of the rolls, which are mostly made of steel, in the range of approximately 160 ° C. However, efforts have recently been made to increase the temperature on the surface of the roller to approximately 250 ° C.
Um solche Temperaturen zu erzeugen, bedarf es natür¬ lich einer Erhöhung der Leistung der Induktionsspule. Die in den Kunststoffkörper eingebetteten Spulendrähte erfahren dabei eine starke Temperaturerhöhung, und zwar einerseits durch induktive Effekte, andererseits aber durch Reflexion von der relativ heißen Walzenoberfläche. Es hat sich gezeigt, daß die herkömmlichen Spulenkörper der geschilderten Art der angestrebten Leistungssteige¬ rung nicht standhalten und die Vorderfläche des Kunst¬ stoffkörpers nach einiger Betriebsdauer abplatzt. In vie¬ len Fällen war nach sechs Stunden ein solcher Spulenkör¬ per unbrauchbar.In order to generate such temperatures, it is of course necessary to increase the power of the induction coil. The coil wires embedded in the plastic body experience a sharp increase in temperature, on the one hand through inductive effects, but on the other hand through reflection from the relatively hot roller surface. It has been shown that the conventional bobbins of the type described do not withstand the desired increase in performance and the front surface of the plastic body flakes off after a period of operation. In many cases, such a bobbin was unusable after six hours.
Der Erfindung liegt die Aufgabe zugrunde, einen gat¬ tungsgemäßen Spulenkörper für höhere Arbeitstemperaturen geeignet zu machen. _ - _The object of the invention is to make a bobbin of the generic type suitable for higher working temperatures. _ - _
Diese Aufgabe wird durch die in Anspruch 1 wiedergege¬ bene Erfindung gelöst.This object is achieved by the invention reproduced in claim 1.
Durch das Kühlelement ist erreicht, daß die Vorder¬ fläche des Kunststoff-Trägers in ihrer Temperatur so niedrig gehalten werden kann, daß keine Zerstörung stattfindet und die höheren Temperaturen an der Walzenoberfläche über lange Zeiträume ertragen werden. Versuche haben einen ein¬ wandfreien Betrieb über 42 Stunden ergeben.The result of the cooling element is that the temperature of the front surface of the plastic carrier can be kept so low that no destruction takes place and the higher temperatures on the roller surface can be endured for long periods of time. Tests have shown perfect operation over 42 hours.
In der bevorzugten Ausführungsform ist das Kühlelement gemäß Anspruch 2 durch eine Kühlkammer gebildet, die von einem fluiden Kühlmedium durchströmbar ist.In the preferred embodiment, the cooling element is formed by a cooling chamber through which a fluid cooling medium can flow.
Das fluide Kühlmedium hat nicht nur die Funktion, Wärme aus dem Bereich der Vorderfläche des Kunststoff¬ trägers abzuführen, sondern hält gleichzeitig die von der Walzenoberfläche ausgehende Strahlung von dieser Vor¬ derfläche ab. Die abzuführende Wärmeleistung beträgt bei einem handelsüblichen Spulenkörper normaler Größe etwa 100 Watt, was durch ein fluides Kühlmedium auch ohne gros- sen Durchsatz bewerkstelligt werden kannt.The fluid cooling medium not only has the function of dissipating heat from the area of the front surface of the plastic carrier, but at the same time keeps the radiation emanating from the roller surface away from this front surface. The heat output to be dissipated is about 100 watts for a commercially available coil body of normal size, which can be achieved by a fluid cooling medium even without a large throughput.
Im einzelnen kann die Kühlkammer gemäß Anspruch 3 ausgebildet sein.In particular, the cooling chamber can be designed according to claim 3.
Das bevorzugte Kühlmedium ist Wasser (Anspruch 4) .The preferred cooling medium is water (claim 4).
Die Wasserkühlung im Zusammenhang mit Induktionsspulen ist an sich bekannt. Aus der DE-PS 34 38 375 geht hervor, einen induktiven Leiter von Kühlwasser durchströmen zu lassen. Es handelt sich bei der bekannten Ausführungsform jedoch nur um eine Leiterschleife aus einem massiven Kup¬ ferrohr. Bei der Erfindung geht es jedoch um eine höhere Leistungskonzentration, die höhere Frequenzen und höhere Windungszahlen erforderlich macht und bei der eine direkte Druchströ ung des einzelnen Leiters nicht mehr realisier¬ bar ist.Water cooling in connection with induction coils is known per se. DE-PS 34 38 375 shows that an inductive conductor of cooling water can flow through. In the known embodiment, however, it is only a conductor loop made from a solid copper tube. However, the invention relates to a higher power concentration, which makes higher frequencies and higher number of turns necessary and in which a direct flow through the individual conductor is no longer feasible.
Eine wichtige Ausgestaltung der Erfindung liegt darin, die der Walze zugewandte Begrenzungsfläche des Kühlele¬ ments reflexionserhöhend auszubilden (Anspruch 5) . Auf diese Weise wird der von der Walze abgestrahlte Warmestrom nur teilweise von dem Kühlelement absorbiert. Die Reflexions¬ erhöhung des Kühlelements kann nicht durch Metallisierung oder Anbringung metallischer Spiegelelemente geschehen, weil diese der Induktionswirkung unterliegen und mitaufge¬ heizt würden. Es ist vielmehr erforderlich, durch Erhöhung des Weißgrades und des Glanzes ein möglichst hohes Re-" flexionsvermögen, d.h. ein möglichst hohes Verhältnis der einfallenden zur reflektierten Strahlungsmenge herbeizu¬ führen.An important embodiment of the invention is to design the boundary surface of the cooling element facing the roller to increase reflection (claim 5). In this way, the heat flow radiated by the roller only partially absorbed by the cooling element. The reflection element of the cooling element cannot be increased by metallization or by attaching metallic mirror elements, because these are subject to the induction effect and would also be heated. Rather, it is necessary to increase the degree of whiteness and glossiness flexionsvermögen highest possible re ", ie the highest possible ratio herbeizu¬ lead to the incident amount of radiation reflected.
In der Zeichnung ist ein Ausführungsbeispiel der Er¬ findung schematisch dargestellt.In the drawing, an embodiment of the invention is shown schematically.
Fig. 1 zeigt eine Seitenansicht eines an einer Walzen¬ oberfläche angeordneten Spulenkörpers, teilweise im Schnitt;1 shows a side view of a bobbin arranged on a roller surface, partly in section;
Fig. 2 zeigt eine Ansicht gemäß Fig. 1 von links nach der Linie II-II in Fig. 1;FIG. 2 shows a view according to FIG. 1 from the left along the line II-II in FIG. 1;
Fig. 3 zeigt einen Teilquerschnitt nach der Linie III-III in Fig. 2.FIG. 3 shows a partial cross section along the line III-III in FIG. 2.
Der in Fig. 1 als Ganzes mit 100 bezeichnete Spulen¬ körper umfaßt einen Kunststoff-Träger 1 in Gestalt eines quaderförmigen Blocks mit einer teilzylindrischen Vorder¬ fläche 2, die dem Außenumfang 3 einer umlaufenden Walze 4 angepaßt, d.h. koaxial ausgebildet ist. Die umlaufende Walze 4 ist als Hohlwalze aus Stahl dargestellt, die von einem nicht wiedergegebenen Querhaupt der Länge nach durch¬ griffen und mittels hydraulischer Stützeinrichtungen von innen an dem undrehbaren Querhaupt abgestützt ist.The coil body designated 100 as a whole in FIG. 1 comprises a plastic carrier 1 in the form of a cuboid block with a partially cylindrical front surface 2 which is adapted to the outer circumference 3 of a rotating roller 4, i.e. is coaxial. The revolving roller 4 is shown as a hollow roller made of steel, which extends lengthways from an unillustrated crosshead and is supported from the inside on the non-rotatable crosshead by means of hydraulic support devices.
Dicht unterhalb der Vorderfläche 2 ist eine in Fig. 1 nur in ihren Umrissen dargestellte Induktionsspule 5 vor¬ gesehen, deren Achse senkrecht auf der Walzenoberfläche steht und die spiralig in einem teilzylindrischen, zur Vorderfläche 2 bzw. zum Walzenumfang 3 koaxialen Bereich 6 verläuft. Der Spulendraht 7 ist durch eine Litze 8 mit sehr vielen gegeneinander lackisolierten Einzeldrähten 9 gebildet. Der Querschnitt des Spulendrahtes 7 ist recht¬ eckig, wobei die Länge des Rechtecks aus einem Mehrfachen der Breite besteht. Wie aus Fig. 3 ersichtlich ist, steht _ cImmediately below the front surface 2 there is an induction coil 5, shown only in its outline in FIG. 1, the axis of which is perpendicular to the roller surface and which runs spirally in a partially cylindrical region 6 that is coaxial with the front surface 2 or the circumference of the roller 3. The coil wire 7 is formed by a strand 8 with a large number of individual wires 9 which are insulated from one another. The cross section of the coil wire 7 is rectangular, the length of the rectangle being a multiple of the width. As can be seen from Fig. 3 stands _ c
der Spulendraht hochkant, d.h. mit den längeren Querschnitts- Rechteckseiten senkrecht zum Walzenumfang 3.the coil wire is upright, i.e. with the longer cross-sectional rectangle sides perpendicular to the roller circumference 3.
Der "Grundriß" der Spule 5 ist aus Fig. 2 ersichtlich und durch den Verlauf der Mittellinie 10 des Spulendrahtes 7 angedeutet. Der Spulendraht 7 verläuft mit seiner Mittel¬ linie 10 von der Zuleitung 11 entlang eines rechteckig (dem Querschnitt des Kunststoff-Trägers 1 angepaßten) -spiraligen Weges von der Zuleitung 11 bis zur Rückleitung 12 und bildet somit in dem Ausführungsbeispiel eine spiralige Spule mit sechs Windungen.The "plan" of the coil 5 can be seen in FIG. 2 and is indicated by the course of the center line 10 of the coil wire 7. The coil wire 7 runs with its center line 10 from the feed line 11 along a rectangular (adapted to the cross section of the plastic carrier 1) spiral path from the feed line 11 to the return line 12 and thus forms a spiral coil with six turns in the exemplary embodiment .
Die Spule 5 ist in das Material des Kunststoff-Trägers 1 eingegossen. Die Vorderfläche 2 des Kunststoff-TrägersThe coil 5 is cast into the material of the plastic carrier 1. The front surface 2 of the plastic carrier
1 steht dem Walzenumfang 3'mit geringem Abstand gegenüber. Der in der Nähe der Vorderfläche 2 gelegene Bereich des Kunststoff-Trägers 1 erfährt eine erhebliche Temperatur¬ beanspruchung, die auch wegen der unterschiedlichen Ma¬ terialien der Spule 5 und des Kunststoff-Trägers 1 dort zu Zerstörungen führt, wenn besonders hohe Leistungen gefragt sind.1 is opposite the roller circumference 3 ' with a small distance. The area of the plastic carrier 1 in the vicinity of the front surface 2 experiences considerable temperature stress, which also leads to destruction there due to the different materials of the coil 5 and the plastic carrier 1 when particularly high powers are required.
Aus diesem Grund ist- vor der Vorderfläche 2 ein als Ganzes mit 20 bezeichnetes flächiges, die VorderflächeFor this reason, in front of the front surface 2 is a flat surface designated as a whole by 20, the front surface
2 ganz überdeckendes Kühlelement vorgesehen, welches als Kühlkammer 13 ausgebildet ist, die von Kühlwasser 14 durch¬ strömt wird. Die Kühlkammer 13 wird durch einen die Vorder¬ fläche 2 geschlossen umrandenden Steg 15 begrenzt, auf den eine Abdeckung 16 in Gestalt eines dünnen Kunststoff¬ blattes von beispielsweise 1 mm Stärke dicht aufgebracht ist, so daß die Kühlkammer 13 bis auf den Zulauf 17 und den Ablauf 18 geschlossen ist. Da der umlaufende Steg 15 ringsum eine gleichbleibende Höhe von beispielsweise2 completely covering cooling element is provided, which is designed as a cooling chamber 13 through which cooling water 14 flows. The cooling chamber 13 is delimited by a web 15 which surrounds the front surface 2 and on which a cover 16 in the form of a thin plastic sheet, for example 1 mm thick, is tightly applied, so that the cooling chamber 13 except for the inlet 17 and the Process 18 is closed. Since the circumferential web 15 all around a constant height of, for example
3 mm aufweist, nimmt die Abdeckung 16 von selbst eine dem Walzenumfang 3 angepaßte Gestalt an und steht dem Walzenumfang 3 im Betrieb mit möglichst geringem Abstand gegenüber. Die Höhe der Kammer 13 sollte möglichst gering sein, damit die Spule 5 trotz des Vorhandenseins des Kühl¬ elements 20 möglichst dicht an den Walzenumfang 3 herange¬ rückt werden kann, was dem Wirkungsgrad der induktiven Beheizung durch die Spule 5 entgegenkommt.3 mm, the cover 16 automatically assumes a shape adapted to the roller circumference 3 and is opposite the roller circumference 3 during operation with the smallest possible distance. The height of the chamber 13 should be as low as possible be so that the coil 5 can be moved as close as possible to the roller circumference 3 despite the presence of the cooling element 20, which accommodates the efficiency of the inductive heating by the coil 5.
Die dem Walzenumfang 3 zugewandte Oberfläche der blatt¬ förmigen Abdeckung 16 der Kühlkammer 13 ist weiß und glän¬ zend ausgeführt, um einen möglichst großen Anteil der von dem Walzenumfang 3 abgestrahlten Wärme zu reflektieren. The surface of the sheet-shaped cover 16 of the cooling chamber 13 facing the roller periphery 3 is white and shiny in order to reflect as large a portion of the heat radiated from the roller periphery 3 as possible.

Claims

P a t e n t a n s p r u c h Patent claim
1. Spulenkörper für die induktive Beheizung der Ober¬ fläche von umlaufenden Walzen aus elektrisch leitendem Material, mit einem Kunststoff-Träger, der eine teilzylindrische, im Radius dem Walzenumfang angepaßte und zur Anbringung dicht vor dem Walzenumfang bestimmte Vorderfläche auf¬ weist, und mit einer dicht hinter der Vorderfläche in den Kunststoff-Träger eingebetteten Spule, dadurch gekennzeichnet, daß vor der Vorderfläche (2) ein in radialer Richtung nur eine geringe Erstreckung aufweisendes flächiges, mit der Vorderfläche (2) in flächiger wärmeleitender Verbin¬ dung stehendes Kühlelement (20) vorgesehen ist.1. Coil body for the inductive heating of the surface of rotating rollers made of electrically conductive material, with a plastic carrier which has a partially cylindrical front surface which is adapted in radius to the roller circumference and is intended for attachment close to the roller circumference, and with one Coil embedded in the plastic carrier directly behind the front surface, characterized in that in front of the front surface (2) there is a flat cooling element (20) which has only a slight extension in the radial direction and which is in a thermally conductive connection with the front surface (2). is provided.
2. Spulenkörper nach Anspruch 1, dadurch gekenn¬ zeichnet, daß das Kühlelement (20) durch eine flache, die Vorderfläche (2) überdeckende, von einem fluiden Kühl¬ medium (14) durchströmbare Kühlkammer (13) gebildet ist. 2. Coil body according to claim 1, characterized gekenn¬ characterized in that the cooling element (20) is formed by a flat, the front surface (2) covering, from a fluid Kühl¬ medium (14) flowable cooling chamber (13).
3. Spulenkörper nach Anspruch 2, dadurch gekenn¬ zeichnet, daß die Kühlkammer (13) ringsum von einem bis auf die Anschlüsse (17,18) geschlossenen Steg (15) gleich¬ bleibender Höhe umrandet und von einer mit dem Steg (15) dicht verbundenen dünnwandigen, zu der Vorderfläche (2) koaxialen Abdeckung (16) überdeckt ist.3. Coil body according to claim 2, characterized gekenn¬ characterized in that the cooling chamber (13) surrounded by a closed except for the connections (17, 18) web (15) constant height and one with the web (15) tight connected thin-walled, to the front surface (2) coaxial cover (16) is covered.
4. Spulenkörper nach Anspruch 2 oder 3, dadurch ge¬ kennzeichnet, daß das fluide Kühlmedium (14) Wasser ist.4. coil body according to claim 2 or 3, characterized ge indicates that the fluid cooling medium (14) is water.
5. Spulenkörper nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die dem Walzenumfang (3) zu¬ gewandte Begrenzungsfläche (19) des Kühlelements (20) stark reflektierend ausgebildet ist. 5. bobbin according to one of claims 1 to 4, characterized in that the roller circumference (3) facing the facing surface (19) of the cooling element (20) is designed to be highly reflective.
EP90910553A 1989-10-13 1990-07-24 Coil body for the inductive heating of rollers Expired - Lifetime EP0495780B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3934208 1989-10-13
DE3934208A DE3934208C2 (en) 1989-10-13 1989-10-13 Coil formers for the inductive heating of rolls

Publications (2)

Publication Number Publication Date
EP0495780A1 true EP0495780A1 (en) 1992-07-29
EP0495780B1 EP0495780B1 (en) 1993-07-14

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EP90910553A Expired - Lifetime EP0495780B1 (en) 1989-10-13 1990-07-24 Coil body for the inductive heating of rollers

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US (1) US5283409A (en)
EP (1) EP0495780B1 (en)
JP (1) JPH077702B2 (en)
CA (1) CA2067137C (en)
DE (2) DE3934208C2 (en)
FI (1) FI100447B (en)
RU (1) RU2069453C1 (en)
WO (1) WO1991006194A1 (en)

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DE59001980D1 (en) 1993-08-19
JPH077702B2 (en) 1995-01-30
US5283409A (en) 1994-02-01
RU2069453C1 (en) 1996-11-20
WO1991006194A1 (en) 1991-05-02
CA2067137A1 (en) 1991-04-14
DE3934208A1 (en) 1991-04-25
FI921591A (en) 1992-04-10
DE3934208C2 (en) 1994-02-17
FI100447B (en) 1997-11-28
CA2067137C (en) 1997-05-20
EP0495780B1 (en) 1993-07-14
JPH05500433A (en) 1993-01-28
FI921591A0 (en) 1992-04-10

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