EP0495780B1 - Armature de bobine pour le chauffage inductif de cylindres - Google Patents

Armature de bobine pour le chauffage inductif de cylindres Download PDF

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Publication number
EP0495780B1
EP0495780B1 EP90910553A EP90910553A EP0495780B1 EP 0495780 B1 EP0495780 B1 EP 0495780B1 EP 90910553 A EP90910553 A EP 90910553A EP 90910553 A EP90910553 A EP 90910553A EP 0495780 B1 EP0495780 B1 EP 0495780B1
Authority
EP
European Patent Office
Prior art keywords
front surface
coil
roller
chamber
coil former
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.)
Expired - Lifetime
Application number
EP90910553A
Other languages
German (de)
English (en)
Other versions
EP0495780A1 (fr
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/fr
Application granted granted Critical
Publication of EP0495780B1 publication Critical patent/EP0495780B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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 coil former of the type corresponding to the preamble of claim 1.
  • Such a coil former is known from EP-A2-00 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 roller surface, which raise the temperature level as a whole, but can also be controlled separately in order to set a specific temperature profile, be it because of the paper web requires a temperature increase at a certain point, be it to increase the roller 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-A2-00 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 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 invention has for its object to make a generic bobbin suitable for higher working temperatures.
  • the radius of the partially cylindrical concave front surface of the plastic carrier is adapted to the circumference of the roll and is intended for attachment close to the circumference of the roll.
  • the cooling chamber has the effect 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 are endured for long periods of time. Trials have shown that it has worked properly for forty-two hours.
  • 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 means of a fluid cooling medium even without large throughput.
  • Cooling per se is known in connection with induction coils.
  • DE-C2-34 38 375 shows that an inductive conductor for heating a roller surface has cooling water flowing through it.
  • the known embodiment is only a conductor loop made of a solid copper tube.
  • the invention relates to a higher power concentration, which requires higher frequencies and higher numbers of turns and in which a direct flow through the individual conductor is no longer possible.
  • a so-called godet is written in US-A-40 05 302, i.e. a rotating heated small drum for stretching yarns, which is heated inductively from the inside.
  • a cylindrical cooling chamber through which a cooling medium can flow is formed radially outside the coil surrounding the bearing journal.
  • cooling chamber can be designed according to claim 2.
  • the boundary surface of the cover facing the roller circumference is designed to be highly heat reflecting (claim 3).
  • the heat flow radiated by the roller only partially absorbed by the cooling element.
  • the reflection of the cooling element can not 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 achieve the highest possible reflectivity, ie the highest possible ratio of the incident to the reflected amount of radiation, by increasing the degree of whiteness and gloss.
  • 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 is traversed lengthways by a crosshead, not shown, and which is supported by hydraulic support devices from the inside on the non-rotatable crosshead.
  • an induction coil 5 which is 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 and the roller circumference 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.
  • Fig. 3 stands the coil wire is upright, ie with the longer cross-sectional rectangular sides perpendicular to the circumference of the roller 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 supply line 11 along a rectangular (adapted to the cross section of the plastic carrier 1) spiral path from the supply 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 1 faces the roller circumference 3 at a short distance.
  • the area of the plastic carrier 1 located in the vicinity of the front surface 2 experiences considerable temperature stress, which also leads to destruction there because of the different materials of the coil 5 and the plastic carrier 1, when particularly high powers are required.
  • a flat cooling element designated as a whole with 20 and completely covering the front surface 2, 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 is closed except for the inlet 17 and the outlet 18 .
  • the circumferential web 15 has a constant height of, for example, 3 mm
  • the cover 16 itself assumes a shape adapted to the roller circumference 3 and is opposite the roller circumference 3 in 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 glossy in order to reflect as large a portion of the heat radiated from the roller periphery 3 as possible.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Induction Heating (AREA)
  • Lens Barrels (AREA)
  • Camera Bodies And Camera Details Or Accessories (AREA)
  • Structure And Mechanism Of Cameras (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)

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.

Claims (3)

  1. Armature de bobine (100) d'un dispositif de chauffage inductif de la surface d'un cylindre de révolution (4) en matériau électriquement conducteur pour le traitement en pression et en température de feuilles de papier et analogues,
       avec un support (1) en matière plastique, qui présente une face antérieure (2) concave en partie cylindrique, adaptée au rayon de la périphérie du cylindre et destinée à être approchée le plus près possible de la périphérie du cylindre,
       et avec une bobine (5) incorporée dans un support (1) en matière plastique juste derrière la face antérieure, caractérisée en ce qu'on prévoit une chambre réfrigérante (13) plane présentant une faible extension, recouvrant la face antérieure (2) en contact conducteur de chaleur plan avec la face antérieure (2), présentant des connexions (17, 18) pour un milieu réfrigérant fluide (14) et parcourue par celui-ci (13).
  2. Armature de bobine selon la revendication 1, caractérisée en ce que la chambre réfrigérante (13) est bordée en révolution par une entretoise (15) hermétique de hauteur constante et est recouverte d'une couverture (16) en matière plastique coaxialement à la face antérieure (2), en partie cylindrique à paroi mince et liée de façon hermétique vis-à-vis de l'entretoise (15).
  3. Armature de bobine selon la revendication 2, caractérisée en ce que la surface de délimitation (19) de la couverture (16) tournée vers la périphérie du cylindre (3) est de structure fortement réfléchissante de la chaleur.
EP90910553A 1989-10-13 1990-07-24 Armature de bobine pour le chauffage inductif de cylindres Expired - Lifetime EP0495780B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3934208 1989-10-13
DE3934208A DE3934208C2 (de) 1989-10-13 1989-10-13 Spulenkörper für die induktive Beheizung von Walzen

Publications (2)

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

Family

ID=6391403

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90910553A Expired - Lifetime EP0495780B1 (fr) 1989-10-13 1990-07-24 Armature de bobine pour le chauffage inductif de cylindres

Country Status (8)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102802291A (zh) * 2012-08-09 2012-11-28 杭州卓达节能设备有限公司 内置式电磁加热辊

Families Citing this family (33)

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US5624594A (en) 1991-04-05 1997-04-29 The Boeing Company Fixed coil induction heater for thermoplastic welding
US5808281A (en) 1991-04-05 1998-09-15 The Boeing Company Multilayer susceptors for achieving thermal uniformity in induction processing of organic matrix composites or metals
US5723849A (en) 1991-04-05 1998-03-03 The Boeing Company Reinforced susceptor for induction or resistance welding of thermoplastic composites
US5728309A (en) 1991-04-05 1998-03-17 The Boeing Company Method for achieving thermal uniformity in induction processing of organic matrix composites or metals
US5641422A (en) 1991-04-05 1997-06-24 The Boeing Company Thermoplastic welding of organic resin composites using a fixed coil induction heater
US5645744A (en) 1991-04-05 1997-07-08 The Boeing Company Retort for achieving thermal uniformity in induction processing of organic matrix composites or metals
US7126096B1 (en) 1991-04-05 2006-10-24 Th Boeing Company Resistance welding of thermoplastics in aerospace structure
US5793024A (en) 1991-04-05 1998-08-11 The Boeing Company Bonding using induction heating
US5508496A (en) * 1991-10-18 1996-04-16 The Boeing Company Selvaged susceptor for thermoplastic welding by induction heating
US5444220A (en) * 1991-10-18 1995-08-22 The Boeing Company Asymmetric induction work coil for thermoplastic welding
US5500511A (en) * 1991-10-18 1996-03-19 The Boeing Company Tailored susceptors for induction welding of thermoplastic
FR2693073A1 (fr) * 1992-06-24 1993-12-31 Celes Dispositif de protection et de refroidissement des pôles d'un inducteur électro-magnétique.
DK0644872T3 (da) * 1993-04-13 1997-10-06 Ciba Geigy Ag Cykliske aminooxy-forbindelser, som hæmmer ornithin-decarboxylase.
US5710412A (en) * 1994-09-28 1998-01-20 The Boeing Company Fluid tooling for thermoplastic welding
US5660669A (en) * 1994-12-09 1997-08-26 The Boeing Company Thermoplastic welding
US5573613A (en) * 1995-01-03 1996-11-12 Lunden; C. David Induction thermometry
US5486684A (en) * 1995-01-03 1996-01-23 The Boeing Company Multipass induction heating for thermoplastic welding
US6602810B1 (en) 1995-06-06 2003-08-05 The Boeing Company Method for alleviating residual tensile strain in thermoplastic welds
US5717191A (en) * 1995-06-06 1998-02-10 The Boeing Company Structural susceptor for thermoplastic welding
US5705795A (en) * 1995-06-06 1998-01-06 The Boeing Company Gap filling for thermoplastic welds
US5829716A (en) * 1995-06-07 1998-11-03 The Boeing Company Welded aerospace structure using a hybrid metal webbed composite beam
US5556565A (en) * 1995-06-07 1996-09-17 The Boeing Company Method for composite welding using a hybrid metal webbed composite beam
US5756973A (en) * 1995-06-07 1998-05-26 The Boeing Company Barbed susceptor for improviing pulloff strength in welded thermoplastic composite structures
US5568235A (en) * 1995-06-22 1996-10-22 Xerox Corporation Induction heated intermediate transfer member
US5760379A (en) * 1995-10-26 1998-06-02 The Boeing Company Monitoring the bond line temperature in thermoplastic welds
US5916469A (en) * 1996-06-06 1999-06-29 The Boeing Company Susceptor integration into reinforced thermoplastic composites
US5869814A (en) * 1996-07-29 1999-02-09 The Boeing Company Post-weld annealing of thermoplastic welds
US5902935A (en) 1996-09-03 1999-05-11 Georgeson; Gary E. Nondestructive evaluation of composite bonds, especially thermoplastic induction welds
US6284089B1 (en) * 1997-12-23 2001-09-04 The Boeing Company Thermoplastic seam welds
DE19921546B4 (de) * 1999-05-11 2004-03-25 Friedrich Von Rohrscheidt Folienlaminator
US8770732B2 (en) 2010-12-08 2014-07-08 Xerox Corporation Inductive heater for a solid ink reservoir
JP6111696B2 (ja) * 2013-01-30 2017-04-12 株式会社リコー 定着装置及び画像形成装置
DE102013008068A1 (de) * 2013-05-10 2014-11-13 Oerlikon Textile Gmbh & Co. Kg Verfahren und Vorrichtung zur Bestimmung einer Oberflächentemperatur eines induktiv beheizten Walzenmantels

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FR2457619A2 (fr) * 1979-05-23 1980-12-19 Siderurgie Fse Inst Rech Four de rechauffage a induction a champ glissant
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US4621177A (en) * 1985-03-27 1986-11-04 Beloit Corporation Inductor configuration for eddy current heating in the papermaking process
FR2630612B1 (fr) * 1988-04-26 1996-05-24 Siderurgie Fse Inst Rech Dispositif de protection des poles d'inducteurs et inducteur pourvu de ce dispositif
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102802291A (zh) * 2012-08-09 2012-11-28 杭州卓达节能设备有限公司 内置式电磁加热辊

Also Published As

Publication number Publication date
FI921591A0 (fi) 1992-04-10
FI921591A (fi) 1992-04-10
FI100447B (fi) 1997-11-28
US5283409A (en) 1994-02-01
CA2067137A1 (fr) 1991-04-14
EP0495780A1 (fr) 1992-07-29
DE3934208A1 (de) 1991-04-25
JPH05500433A (ja) 1993-01-28
RU2069453C1 (ru) 1996-11-20
WO1991006194A1 (fr) 1991-05-02
DE3934208C2 (de) 1994-02-17
CA2067137C (fr) 1997-05-20
JPH077702B2 (ja) 1995-01-30
DE59001980D1 (de) 1993-08-19

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