EP2056649B1 - Support pour un dispositif de chauffage électrique et dispositif de chauffage électrique ainsi que procédé de fabrication - Google Patents

Support pour un dispositif de chauffage électrique et dispositif de chauffage électrique ainsi que procédé de fabrication Download PDF

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Publication number
EP2056649B1
EP2056649B1 EP08017878.3A EP08017878A EP2056649B1 EP 2056649 B1 EP2056649 B1 EP 2056649B1 EP 08017878 A EP08017878 A EP 08017878A EP 2056649 B1 EP2056649 B1 EP 2056649B1
Authority
EP
European Patent Office
Prior art keywords
support
paths
depressions
heating element
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.)
Not-in-force
Application number
EP08017878.3A
Other languages
German (de)
English (en)
Other versions
EP2056649A2 (fr
EP2056649A3 (fr
Inventor
Karl-Heinz Horsmann
Eugen Wilde
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.)
EGO Elektro Geratebau GmbH
Original Assignee
EGO Elektro Geratebau GmbH
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 EGO Elektro Geratebau GmbH filed Critical EGO Elektro Geratebau GmbH
Publication of EP2056649A2 publication Critical patent/EP2056649A2/fr
Publication of EP2056649A3 publication Critical patent/EP2056649A3/fr
Application granted granted Critical
Publication of EP2056649B1 publication Critical patent/EP2056649B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • H05B3/00—Ohmic-resistance heating
    • H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
    • H05B3/688—Fabrication of the plates
    • 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
    • H05B3/00—Ohmic-resistance heating
    • H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
    • H05B3/74—Non-metallic plates, e.g. vitroceramic, ceramic or glassceramic hobs, also including power or control circuits
    • H05B3/748—Resistive heating elements, i.e. heating elements exposed to the air, e.g. coil wire heater
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making

Definitions

  • the invention relates to a support for an electric heater, which consists of insulating material and on the upper side at least one heating element is arranged.
  • the heating element is elongated and runs in upwardly open paths on the top of the carrier.
  • the invention relates to an electric heater with such a carrier and a method for producing such a carrier and such a heater.
  • the EP-A-0 035 254 discloses a support for an electric heater together with such a heater with heating elements on an upper side.
  • the elongate heating elements are in recessed tracks that are open at the top for radiating upward to heat a cooking vessel from above on a cooktop panel running above it. Holes are provided in the tracks to force a convection airflow to heat the underside of the hob plate accordingly to increase efficiency.
  • the DE 520 136 C shows an electric heater with a carrier, which consists of two superimposed parts. At an interface between the parts run semi-circular grooves, which complement each other to form a circumferential, annular channel. In this channel, an elongated heating coil is arranged. The grooves are upwardly and downwardly open with slots, so that from an attached cooking vessel leaking liquid can escape down.
  • the invention has for its object to provide a support mentioned above, an electric heater with such a carrier and a method for manufacturing, which can be avoided with the problems and disadvantages of the prior art and in particular in the simplest possible way such a heater can be constructed and mounted.
  • additional depressions are introduced into the underside of the carrier, which extend at least to the webs, ie pass into these.
  • These recesses are preferably wider than the tracks. In the area of these depressions, so to speak, continuous openings are created by the carrier, which are advantageously even wider.
  • the recesses are at least 10% wider than the tracks, particularly advantageously significantly wider, so for example 20% to 60%.
  • sufficient space is created or a sufficiently large undercut under the tracks.
  • the recesses may, for example, have a round cross-section, in particular be circular. Alternatively, they can also be square or rectangular. Advantageously, they are thus formed in the manner of a blind hole and, as will be explained in more detail below, by pressing a punch or the like. produced during pressing.
  • the distribution of the depressions is basically freely selectable.
  • such depressions are provided on tight bends or loops of the webs, since a fastening of the heating element against moving out is particularly advantageous here.
  • a distance of the recesses to each other can be several times their diameter, for example 3 to 5 times or even 20 times. The distances can also be regular, but they do not have to be.
  • the depressions can go at least to half of the carrier, advantageously even deeper. Particularly advantageously, they reach between 60% and 90% into the carrier.
  • the tracks for the heating elements can go at least 30% deep into the carrier, but advantageously more.
  • the webs can go between 40% and 80% in the carrier so that a heating element is below its top.
  • a kind of overlap should be present, so that the space formed by the undercut is not completely below the web, but occupies a part or even a majority of it or overlaps it, so to speak. This facilitates the wide pressing of the heating elements in this area, since they then do not have to be much lower in order to expand to the side into the undercut can.
  • the webs may have a known rectangular cross-section.
  • the carrier is advantageously formed in one piece, namely compressed. In particular, it is produced in a single pressing operation, for which purpose it is particularly advantageous to provide depressions on the webs for producing the undercuts.
  • said one-piece design does not exclude that additional parts can be attached to the carrier, for example, a cover on the bottom for electrical insulation or further thermal insulation.
  • a cover plate made of micanite may be provided in an embodiment of the invention in a said carrier or a heater on the top, which has approximately the size of the heater or at least the area covered by the heating elements.
  • This cover plate can serve for electrical insulation upwards. If a named heater should not work as a radiant heater with high power, but for example as a warming radiator with temperatures below 200 ° C, it has surprisingly been found in the context of this additional and independent invention that such a cover plate hardly bothers the heat transfer or at most temporally delayed a little.
  • the carrier may be formed in a further embodiment of the invention in the manner of a flat plate or a disc. It may have a peripheral edge which projects beyond the heating elements or over the other top side of the carrier. This can represent an advantageous holding option for an aforementioned cover disk. Furthermore, the carrier can be pressed as a finished heater with this edge to the underside of a hob plate.
  • an electric heater according to the invention can be provided by the elongated heating elements are placed in the webs and then run it. In the region of the depressions, the heating elements are pressed in width or pushed beyond the width of the webs into the undercuts created by the depressions. So they are held against lifting up, since they are now wider than the train. This wide pressing can advantageously take place in that pressure is exerted on the heating element at least from the top side, for example by a stop.
  • a counterstop is brought to the heating element from below in a particularly advantageous manner, so that it is, as it were, pressed wide between the stop and the counterstop.
  • the counter-stop may be immobile after entering the recess to the underside of the heating element, while the stop presses on the heating element or even hits.
  • a stop for pressing the heating element is advantageously relatively pointed or provided with a narrow edge. So he can advantageously score the heating element or press wide.
  • the counter-attack in turn, is advantageously flat and wide to support the heating element well.
  • This spreading of the heating elements is particularly advantageous if they consist of coiled heating wire, in particular round-wound heating wire.
  • the narrowness of the spiraling plays a subordinate role.
  • the cross section or the width of the heating elements can be increased by the wide pressing by at least 10%, preferably even by at least 20%. Thus, it is possible to press them across the width of the webs wide for clinging.
  • the normal width of the heating elements is advantageously only slightly less than the width of the webs for easy insertion.
  • the heating elements In order to connect the heating elements, it is possible in one embodiment of the invention to pass them through the carrier in a middle region, which is remote from the outer edge, from the upper side to a lower side.
  • a hole may be provided in the carrier.
  • electrical connection cables can be brought to the terminals and fixed, for example, welded.
  • a connection of an electrical connection cable to a connection of the heating element takes place very close to the underside of the carrier.
  • a mechanical securing of the connections and of the heating element against movement is formed.
  • the connections of the heating elements can be led away laterally from the carrier.
  • the webs can extend as far as the outer edge of the carrier, so that the heating elements or their connections can be guided outward here and not project upwards beyond the upper side or the aforementioned edge of the carrier.
  • the connections can be, for example be formed as connecting wires on which a round wound heating element is plugged and welded.
  • For their attachment to the carrier they can by holding means such as brackets or the like. be fastened in the outer region of the carrier, for example, be clamped from the top. This makes a simple and mechanically safe connection possible.
  • such a carrier advantageously made of suitable insulating material, preferably fiber-free and non-ceramic insulating material. From this it is produced by compression, advantageously in a single operation.
  • the carrier may be formed relatively thin, for example, be about 8mm to 15mm thick. The thermal insulation is sufficiently ensured, especially if the finished heater does not cause excessive temperature development. This is the case in particular when the heating device is designed as a so-called heated radiator. This means that in a food preparation, no large energy inputs are possible, but a provided with this heater cooking surface on a hob for keeping warm pots and the food is used.
  • the power of the heating element or the heating device can be between 100 watts and 150 watts, in particular with a power density for the carrier of 0.6 W / cm 2 .
  • the underside of the carrier may be formed substantially flat.
  • it may be provided on its underside at least one protruding attachment region, which is preferably integrally formed, where it may alternatively be attached later, for example, glued.
  • Particularly advantageous two such mounting areas are provided on the underside, which are in particular the same design.
  • Such a mounting area is at least over the underside of the carrier over, possibly over the margin. It serves to fasten the carrier or the electric heating device constructed with it, for example, as a cooking point on a hob under a glass ceramic hob plate.
  • the attachment region has at least one prefabricated opening into which a fastening screw or the like. can be screwed.
  • Such an opening advantageously has such a way away from the carrier that a fastening screw is approximately perpendicular to the plane of the underside of the carrier.
  • Fig. 1 the carrier 11 according to the invention is shown from above.
  • the plate or disc-like carrier 11 has an upper side 12 and a lower side 13. At the top 12 extends around a slightly raised edge 14.
  • the carrier 11 is made in one piece in a single pressing operation. It consists of commonly used insulating material, possibly with a binder.
  • tracks 16 are formed, which go slightly deeper than half the thickness of the wearer.
  • the tracks run meandering for a heating element with a few turns.
  • the course may be such that the webs 16 start and end in a central area.
  • at least one hole 17 can be seen, which leads at the end of the web 16 through the carrier 11 to its underside 13.
  • the webs 16 may extend to the edge 14 with an edge exit 18, as also exemplified.
  • a heating element or its electrical connection can be led out.
  • recesses 19 are shown in dashed lines in a round shape. They are provided on the one hand at the turning points of the tracks 16 and at about regular distance in between.
  • Fig. 3 is shown in side section a heater 23 which is constructed with the carrier 11.
  • the heating elements 24 which consist of coiled heating wire, for example of a FeCrAl alloy.
  • the heating elements 24 run in the tracks 16 and are slightly narrower than these and also do not protrude beyond the top 12.
  • connection 26 extends through the hole 17 in the carrier 11 and projects beyond the underside 13.
  • a connection cable 27 is brought to a projecting beyond the bottom 13 end of the terminal 26 and welded.
  • the magnification in Fig. 4 shows the wide pressing of the heating elements 24.
  • a counter-stop 33 is retracted from below into the recess 19 up to the heating element 24 zoom.
  • a stop 32 presses or hammers from the upper side 12 in the middle on the heating element 24 and presses it wide in this area, so that a notch 29 and especially laterally the widened areas 30 are formed in the upper area. These expand almost to the wall of the recess 19 and thus over the web 16 on, so that a moving out is no longer possible.
  • the stop 32 is not wider than the diameter of the recess 19, so that in the longitudinal direction of the web 16 and only here the heating element 24 is pressed wide.
  • Fig. 5 is also shown in the side view, the said overlap, wherein dashed lines to the top of the recess 19 and is shown dotted down to the course of the web 16.
  • the heating element 24 is pressed or has the widened regions 30, which hold it in the web 16.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Resistance Heating (AREA)
  • Surface Heating Bodies (AREA)
  • Air-Conditioning For Vehicles (AREA)

Claims (17)

  1. Support (11) pour un dispositif de chauffage électrique (23) pour disposer des éléments chauffants (24) sur un côté supérieur (12) du support, les éléments chauffants (24) étant allongés et s'étendant dans des pistes renfoncées (16) sur le côté supérieur du support, les pistes renfoncées étant complètement ouvertes vers le côté supérieur (12), des renfoncements supplémentaires (19) étant pratiqués dans le côté inférieur (13) du support, lesquels renfoncements supplémentaires s'étendent au moins jusqu'aux pistes (16), caractérisé en ce que les renfoncements (19) sont plus larges que les pistes.
  2. Support selon la revendication 1, caractérisé en ce que les renfoncements (19) sont plus larges d'au moins 10 % que les pistes (16), de préférence de 20 % à 60 %.
  3. Support selon la revendication 1 ou 2, caractérisé en ce que les renfoncements (19) présentent une section transversale ronde, de préférence sont ronds circulaires, à la manière d'un trou borgne.
  4. Support selon l'une quelconque des revendications précédentes, caractérisé en ce que des renfoncements (19) sont prévus au niveau de codages étroits ou de boucles des pistes (16) et/ou les renfoncements présentent un espacement mutuel qui correspond au moins au triple ou au quintuple de leur diamètre.
  5. Support selon l'une quelconque des revendications précédentes, caractérisé en ce que la profondeur des renfoncements (19) correspond au moins à 50 % de l'épaisseur du support (11), de préférence à 60 % à 90 %.
  6. Support selon l'une quelconque des revendications précédentes, caractérisé en ce que la profondeur des pistes (16) correspond au moins à 30 % de l'épaisseur du support (11), de préférence à 40 % à 80 %.
  7. Support selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il est réalisé d'une seule pièce, de préférence en ce qu'il est comprimé, en particulier comprimé une fois.
  8. Dispositif de chauffage électrique (23) comprenant un support (11) selon l'une quelconque des revendications précédentes, caractérisé en ce que des éléments chauffants allongés (24) s'étendent dans les pistes (16), lesquelles sont fixées par écrasement en largeur des éléments chauffants (24) dans la région des renfoncements (19) sur la largeur des pistes (16) pour les empêcher de ressortir vers le haut.
  9. Dispositif de chauffage selon la revendication 8, caractérisé en ce que les éléments chauffants allongés (24) se composent de filaments chauffants enroulés.
  10. Dispositif de chauffage selon la revendication 8 ou 9, caractérisé en ce que la section transversale ou la largeur des éléments chauffants (24) est augmentée d'au moins 10 % par l'écrasement en largeur, de préférence d'au moins 25 %, la largeur des éléments chauffants (24) n'étant notamment au maximum que légèrement inférieure à la largeur des pistes (16) avant l'écrasement en largeur.
  11. Dispositif de chauffage (23) selon l'une quelconque des revendications 8 à 10, caractérisé en ce que des bornes (26) des éléments chauffants (24) sont guidées dans une région centrale à l'écart du bord extérieur (14) depuis le côté supérieur (12) jusqu'à un côté inférieur (13) à travers le support (11) et peuvent être atteintes depuis le côté inférieur en vue du contact électrique (27) ou en vue de la fixation mécanique des bornes (26).
  12. Dispositif de chauffage selon la revendication 11, caractérisé en ce que des câbles de raccordement électriques (27) sont fixés aux bornes (26) au niveau du côté inférieur (13) du support (11) en vue du raccordement électrique, ce qui produit une fixation mécanique des bornes pour empêcher qu'elles ne ressortent, en particulier aussi une fixation de l'élément chauffant (24), de préférence une connexion des câbles de raccordement électriques (27) aux bornes (26) étant très proche du support (11).
  13. Procédé de fabrication d'un support (11) selon l'une quelconque des revendications 1 à 7, dans lequel lors du formage du support en matériau isolant, des pistes renfoncées (16) sont réalisées sur un côté supérieur (12) pour la pose d'un élément chauffant allongé (24) et des renfoncements (19) sont réalisés au niveau d'un côté inférieur (13), lesquels s'étendent jusqu'aux pistes (16), caractérisé en ce que les renfoncements (19) sont plus larges que les pistes.
  14. Procédé de fabrication d'un dispositif de chauffage (23) selon l'une quelconque des revendications 8 à 12, caractérisé en ce qu'au moins un élément chauffant (24) est introduit dans les pistes (16) depuis le côté supérieur (12), puis l'élément chauffant (24) est écrasé en largeur ou élargi sous pression en partie au niveau des renfoncements (19) au moins à partir du côté supérieur (12), les renfoncements (19) étant plus larges que les pistes.
  15. Procédé selon la revendication 14, caractérisé en ce qu'une pression est exercée sur l'élément chauffant également depuis le côté inférieur (13), notamment par l'application d'une contre-butée (33), l'élément chauffant étant pressé de préférence à partir du côté supérieur (12) par déplacement d'une butée (32) et à partir du côté inférieur (13), l'élément chauffant (24) étant supporté par la contre-butée (33).
  16. Procédé selon la revendication 14 ou 15, caractérisé en ce que la butée (32) est relativement pointue ou présente une arête étroite pour entailler le profil de l'élément chauffant (24), la contre-butée (33) étant plate et large, de préférence étant un peu plus petite que le renfoncement (19).
  17. Procédé selon l'une quelconque des revendications 12 et 14 à 16, caractérisé en ce que les extrémités de bornes (26) de l'élément chauffant (24) sont guidées latéralement à l'écart du support (11), en particulier à travers un guide des pistes (16) jusqu'au bord extérieur du support (11), et dépassent au-delà du côté du support, les bornes (26) étant fixées de préférence au moyen de moyens de retenue tels que des pinces ou similaires au niveau de la région extérieure du support (11).
EP08017878.3A 2007-10-30 2008-10-13 Support pour un dispositif de chauffage électrique et dispositif de chauffage électrique ainsi que procédé de fabrication Not-in-force EP2056649B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007053348A DE102007053348A1 (de) 2007-10-30 2007-10-30 Träger für eine elektrische Heizeinrichtung und elektrische Heizeinrichtung sowie Herstellungsverfahren

Publications (3)

Publication Number Publication Date
EP2056649A2 EP2056649A2 (fr) 2009-05-06
EP2056649A3 EP2056649A3 (fr) 2009-11-04
EP2056649B1 true EP2056649B1 (fr) 2013-06-05

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Family Applications (1)

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EP08017878.3A Not-in-force EP2056649B1 (fr) 2007-10-30 2008-10-13 Support pour un dispositif de chauffage électrique et dispositif de chauffage électrique ainsi que procédé de fabrication

Country Status (3)

Country Link
US (1) US8461491B2 (fr)
EP (1) EP2056649B1 (fr)
DE (1) DE102007053348A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100877355B1 (ko) * 2007-12-14 2009-01-07 주식회사 에이엠오 스트립형 면상 발열체를 이용한 동파방지용 히터 및 그의제조방법
KR102093766B1 (ko) * 2018-08-21 2020-03-26 엘지전자 주식회사 전기 히터

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DE102005025896B4 (de) 2005-05-25 2010-11-25 E.G.O. Elektro-Gerätebau GmbH Kochfeldplatte mit optischer Temperaturanzeige und mit Vorrichtung zur optischen Temperaturerfassung sowie entsprechendes Kochfeld

Also Published As

Publication number Publication date
EP2056649A2 (fr) 2009-05-06
EP2056649A3 (fr) 2009-11-04
US20090107983A1 (en) 2009-04-30
US8461491B2 (en) 2013-06-11
DE102007053348A1 (de) 2009-05-07

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