EP0750444A1 - Radiant heater and method for its manufacture - Google Patents

Radiant heater and method for its manufacture Download PDF

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Publication number
EP0750444A1
EP0750444A1 EP96109730A EP96109730A EP0750444A1 EP 0750444 A1 EP0750444 A1 EP 0750444A1 EP 96109730 A EP96109730 A EP 96109730A EP 96109730 A EP96109730 A EP 96109730A EP 0750444 A1 EP0750444 A1 EP 0750444A1
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EP
European Patent Office
Prior art keywords
tablet
thermal insulation
heating conductor
carrier shell
radiant heater
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
EP96109730A
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German (de)
French (fr)
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EP0750444B1 (en
EP0750444B2 (en
Inventor
Eugen Wilde
Martin Gross
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EGO Elektro Geratebau GmbH
Original Assignee
EGO Elektro Geratebau GmbH
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Application filed by EGO Elektro Geratebau GmbH filed Critical EGO Elektro Geratebau GmbH
Priority to DE29624627U priority Critical patent/DE29624627U1/en
Priority to SI9630441T priority patent/SI0750444T2/en
Publication of EP0750444A1 publication Critical patent/EP0750444A1/en
Publication of EP0750444B1 publication Critical patent/EP0750444B1/en
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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
    • 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
    • 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
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/017—Manufacturing methods or apparatus for heaters
    • 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
    • Y10T29/49082—Resistor making
    • Y10T29/49083—Heater type

Definitions

  • the invention relates to a method for producing a radiant heater with a carrier shell and an insulating layer inserted therein, on which a heating conductor is attached, and to such a radiant heater.
  • a radiation heating unit for glass ceramic electric cooking devices has become known, in which one or more insulating layers of non-or poorly compressed bulk material lie in a carrier shell. A layer of fibrous insulating material is placed on these layers, on which heating coils are fixed by embedding in the wet state. The plate is held down by a peripheral edge.
  • the heating conductors are attached in an ideal manner, but a two-layer structure is necessary.
  • a radiant heater has become known in which a pourable insulating material is filled into a carrier shell and compressed with a stamp, so that a surface forms on which heating coils are stapled by means of wire clips. The surface does not have to be flat.
  • the surface of the lower layer or the lower surface of the upper layer are arched away from each other.
  • a multi-layer insulation structure is not only complex, but also inferior to a single-layer structure in terms of its insulating effect, at least when one of the layers consists of less good thermal insulation material. For this reason, the aim is to get by with a layer of the best thermal insulation material. It is a pourable insulating material that is pressed accordingly to hold it together.
  • the object of the invention is to provide a method and a radiant heater produced therewith, which are easy to manufacture and highly effective in insulation allows a perfect and even embedding of the heating conductor.
  • the carrier shell produced as a sheet metal plate usually had a naturally convex base.
  • the insulation bulged upwards due to radial compressive stress. If the fastening feet were pressed into this curved surface, the fastening was either imperfect in the edge area or too deep in the central area, so that the radiating surface of the heating conductors was too small.
  • the stamp could not be arched either because the curvature of the thermal insulation layer was unpredictable and uneven and, furthermore, a curved shape of the surface carrying the heat conductor would mean an inadmissible increase in the overall height of the radiant heater.
  • both the production of the molded thermal body and the attachment of the heating conductors are preferably carried out in a separate form outside the carrier shell and the one-piece tablet prepared in this way, fitted with the heating conductor, is placed in the empty sheet metal plate.
  • a convex bottom of the plate plate does not interfere, because it creates an additional air-insulating layer.
  • the tablet is in one piece and preferably also in one layer, but could also be formed as a multi-layer pressed.
  • a secure and tilt-free attachment can be ensured in that the carrier shell has in its edge region an annular support shoulder which is raised in relation to the floor and on which a correspondingly offset edge of the tablet rests.
  • the heating conductors can preferably be a thin, corrugated band of heating conductor material which is fixed upright on the insulating body by means of fastening feet which are formed on the band and which protrude at a distance from one another, but possibly also extend over the entire length of the heating conductor and / or can be interrupted by perforations, are pressed. These are curved in accordance with the corrugation of the band and thus form spade-shaped fastening elements which are stable in shape due to their curvature and which can also be pressed into the finished tablet surface.
  • a pourable insulating material 31 is filled into a mold 12 shown in FIGS. 1 and 2 and, if necessary, smoothed out for uniformity.
  • the shape has an adapted shape of one of the outer shapes of the radiant heater, but need not exactly match this. Rather, the mold recess 33 can deviate from the final shape that the product manufactured therein is supposed to have in such a way that the product according to its Pressing and taking into account all further intermediate steps finally receives the desired final shape.
  • the insulating material is a silica airgel, which is pyrogenic and has a dust-like consistency when unpressed.
  • This silica airgel is normally mixed with additives, such as opacifiers, which reduce the radiation transmission, binders and / or reinforcing agents to increase the mechanical strength, for example fibers.
  • additives such as opacifiers, which reduce the radiation transmission, binders and / or reinforcing agents to increase the mechanical strength, for example fibers.
  • a press ram 13 can be inserted into the mold, which compresses the loose bulk material in such a way that a manageable tablet is formed, but which is not so compacted that it loses its good thermal insulation properties.
  • the design of the press ram possibly deviating from the flat shape of the pressing surface 14, can also ensure that the resulting thermal insulation molding 15, also referred to below as a tablet, has a flat surface.
  • a heating conductor strip 17 is now partially pressed into the surface 18 of the thermal insulation molded part 15 by an insertion stamp 16.
  • the insertion punch 16 has grooves 20 in its surface 19 facing the surface 18. The grooves are arranged in accordance with the desired laying (macro shape) of the heating conductor, for example in a spiral or meandering manner. They are about as wide as the heating conductor.
  • the heating conductor 17 consists of a thin strip of heating conductor material shown in more detail in FIG. 3.
  • the thickness is usually only a few hundred millimeters, e.g. 0.04 - 0.07 mm, while the height is a few millimeters.
  • Fastening feet 22 are arranged on the lower edge of the continuous band-shaped area 21, which are made in one piece with the band by corresponding punching or cutting. These e.g. Rectangular or trapezoid-shaped fastening feet, like the band, are curved in a wave-like manner, so that the band has a corrugation running transversely to its main direction. The axes of curvature of the waves are therefore perpendicular to the surface 18, 19.
  • the heating conductor strips 17 are held in the grooves 20 by appropriate dimensioning and resilient contact or by magnets introduced into the insertion stamp, so that the fastening feet 22 protrude from the grooves 20 beyond the lower surface 19 of the insertion stamp 16.
  • the insertion stamp is pressed against the flat surface 18 of the tablet 15, namely until the fastening feet 22 have penetrated the pre-compressed material.
  • the surface 19 of the insertion die limits the die movement, which, however, can also be intercepted accordingly by a control. A certain amount of repressing can take place, but this is not absolutely necessary.
  • the stamp 16 is raised while the heating conductors 17 remain on the tablet 15. This can be facilitated by e.g. an electromagnet holding the heating conductor is switched off.
  • the thermal insulation molded part 15, which is now firmly connected to the heating conductor strip, is removed from the mold or its holder and can, if necessary after an intermediate storage, be used as prefabricated part can be inserted into a sheet metal carrier shell 23 of a radiant heater.
  • This sheet metal carrier shell has the shape of a flat shell with an edge 25 which is somewhat raised in relation to the bottom 24 and which is adjoined by the vertically projecting outer edge 26.
  • the tablet 15 has a base which is molded in accordance with this shape, namely a recessed base section 27, and an edge region 28 which is offset in comparison therewith and which rests on the support shoulder 25 when the tablet 15 is inserted.
  • annular edge 30 made of a mechanically somewhat firmer and also highly heat-resistant Insert insulation material, for example made of ceramic fibers or vermiculite, which protrudes somewhat above the outer edge of the sheet metal 26 and rests with its top against the underside of a glass ceramic plate 29 which forms the cooking surface.
  • This edge 30 then also serves at the same time to secure the thermal insulation molded part in the carrier shell and prevents it from being lifted off during transport, for example.
  • the heat molded part 11 Due to the large-area hold-down and the fact that this edge 30 engages directly above the support shoulder 25, the heat molded part 11 is only loaded by low compressive forces when the radiant heater 11 is pressed resiliently onto the underside of the glass ceramic plate.
  • the separate heat-insulating molded part 25 can be somewhat smaller than the carrier shell, so that expansions caused by heat, moisture or the like do not lead to tensioning of the heat-insulating molded part.
  • the resulting radiant heater is thus characterized by a surface to be designed that carries the heating conductors and has a uniform embedding depth of the heating conductors, this being independent of the shape of the support shell, the base 24 of which could be curved accidentally or deliberately, in order to avoid any spring washer effects in the process To prevent warming. Due to the single-layer insulation made of highly heat-insulating and high-temperature resistant material, the insulation is very effective and inexpensive to manufacture. Due to the low mechanical requirements, reinforcement by fibers can largely be dispensed with.
  • the surface 18 of the separate thermal insulation molding 15 is flat in the sense that it corresponds exactly to the desired shape.
  • the surface could, for example, also consist of two levels that are offset in height, for example if Heating conductors of different heights can be used in different areas.
  • preference is given to the planar execution of the surface 18 running as precisely as possible parallel to the lower edge of the glass ceramic, the upper edges of the heating conductors then also lying in a plane lying parallel to the glass ceramic surface.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Resistance Heating (AREA)
  • Constitution Of High-Frequency Heating (AREA)
  • Aerials With Secondary Devices (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Abstract

The method involves pressing a heat barrier film (15) in a special form as a tablet (12) of disposable heat resistant material with an essentially flat surface. The heat conductor (17) is attached to the surface with partial embedding in the heat barrier material. The tablet is placed in an empty carrier shell (23) as a one-piece heat barrier. The partial embedding is performed in the vicinity of protruding attachment feet (22) of the heat conductor. The hear conductor is placed in an insertion tool (16) and pressed into the surface of the tablet with its embedded parts.

Description

Anwendungsgebiet und Stand der TechnikField of application and state of the art

Die Erfindung betrifft ein Verfahren zur Herstellung eines Strahlungsheizkörpers mit einer Trägerschale und einer darin eingelegten Isolierschicht, auf der ein Heizleiter befestigt ist, sowie einen derartigen Strahlungsheizkörper.The invention relates to a method for producing a radiant heater with a carrier shell and an insulating layer inserted therein, on which a heating conductor is attached, and to such a radiant heater.

Aus der DE 27 29 930 A ist eine Strahlungs-Heizeinheit für Glaskeramik-Elektrokochgeräte bekanntgeworden, bei der in einer Trägerschale ein oder mehrere Isolierschichten aus nicht oder schwach verdichtetem Schüttmaterial liegen. Auf diese Schichten wird eine Platte aus faserigem Isoliermaterial gelegt, auf der durch Einbetten im Naßzustand Heizwendeln festgelegt sind. Die Platte wird von einem umlaufenden Rand niedergehalten. Hier ist die Befestigung der Heizleiter in idealer Weise vorgenommen, jedoch ein zweischichtiger Aufbau nötig.From DE 27 29 930 A, a radiation heating unit for glass ceramic electric cooking devices has become known, in which one or more insulating layers of non-or poorly compressed bulk material lie in a carrier shell. A layer of fibrous insulating material is placed on these layers, on which heating coils are fixed by embedding in the wet state. The plate is held down by a peripheral edge. Here, the heating conductors are attached in an ideal manner, but a two-layer structure is necessary.

Aus der DE 28 06 367 A ist ein Strahlungsheizkörper bekanntgeworden, bei dem ein schüttfähiges Isoliermaterial in eine Trägerschale eingefüllt und mit einem Stempel verdichtet wird, so daß sich eine Oberfläche bildet, auf der Heizwendeln mittels Drahtklammern festgeheftet werden. Die Oberfläche braucht dabei nicht eben zu sein.From DE 28 06 367 A a radiant heater has become known in which a pourable insulating material is filled into a carrier shell and compressed with a stamp, so that a surface forms on which heating coils are stapled by means of wire clips. The surface does not have to be flat.

Ein ähnlicher Aufbau mit in tiefen Rillen eingebetteten Heizwendeln ist aus der EP 35 280 B bekanntgeworden, wobei eine untere, dünne Schicht aus schüttfähigem Isoliermaterial direkt in die Trägerschale eingepreßt wird, während darüber eine dickere Schicht aus mit anorganischem Kleber gebundenem Aluminiumsilicat darüberliegt, die somit den Heizleiter "festkleben" kann.A similar structure with heating coils embedded in deep grooves has become known from EP 35 280 B, in which a lower, thin layer of pourable insulating material is pressed directly into the carrier shell, while a thicker layer of aluminum silicate bonded with inorganic adhesive lies above it, which thus covers the "Stick" heating conductor.

Um eine stabile Lage der Isolierschichten zu gewährleisten, sind die Oberfläche der unteren Schicht bzw. die untere Fläche der oberen Schicht jeweils voneinander weggewölbt.In order to ensure a stable position of the insulating layers, the surface of the lower layer or the lower surface of the upper layer are arched away from each other.

Ein mehrschichtiger Isolierungsaufbau ist nicht nur aufwendig, sondern auch bezüglich seiner Isolierwirkung einem einschichtigem Aufbau zumindest dann unterlegen, wenn eine der Schichten aus weniger gut wärmedämmendem Material besteht. Deswegen wird angestrebt, möglichst mit einer Schicht aus bestens wärmedämmendem Material auszukommen. Dabei handelt es sich um schüttfähiges Isoliermaterial, das zum Zusammenhalt entsprechend verpreßt wird.A multi-layer insulation structure is not only complex, but also inferior to a single-layer structure in terms of its insulating effect, at least when one of the layers consists of less good thermal insulation material. For this reason, the aim is to get by with a layer of the best thermal insulation material. It is a pourable insulating material that is pressed accordingly to hold it together.

Aufgabe und LösungTask and solution

Aufgabe der Erfindung ist es, ein Verfahren und einen damit hergestellten Strahlungsheizkörper zu schaffen, der bei einfacher Herstellbarkeit und großer Wirksamkeit der Isolierung eine einwandfreie und gleichmäßige Einbettung des Heizleiters ermöglicht.The object of the invention is to provide a method and a radiant heater produced therewith, which are easy to manufacture and highly effective in insulation allows a perfect and even embedding of the heating conductor.

Diese Aufgabe wird durch ein Verfahren nach Anspruch 1 gelöst. Die Herstellung der gesamten Isolation aus schüttbarem hochtemperaturbeständigem Wärmedämm-Material als eine vorgefertigte Tablette ermöglicht die Herstellung in einer größen- und formmäßig genau bemessenen Form, wobei vor allem sichergestellt werden kann, daß nach der Verpressung des Isoliermaterials die Oberfläche der Tablette eben ist. In diese ebene Oberfläche lassen sich die Heizleiter, die in einem im übrigen ebenen Stempel in Nuten aufgenommen sind, aus denen sie mit ihren Befestigungsfüßen hervorstehen, so einpressen, daß die Füße jeweils gleich tief in die Oberfläche eingedrückt werden und dementsprechend auch der herausstehende Teil stets gleich breit ist, wenn dies beabsichtigt ist.This object is achieved by a method according to claim 1. The production of the entire insulation from pourable, high-temperature-resistant thermal insulation material as a prefabricated tablet enables production in a size and shape that is precisely dimensioned, and above all it can be ensured that the surface of the tablet is flat after the compression of the insulating material. In this flat surface, the heat conductors, which are accommodated in an otherwise flat stamp in grooves from which they protrude with their fastening feet, are pressed in such a way that the feet are pressed equally deep into the surface and, accordingly, the protruding part always is the same width if this is intended.

Bei der Einpressung der Isolierschicht unmittelbar in die Trägerschale ließ sich dies nicht verwirklichen. Die als Blechteller hergestellte Trägerschale hatte meist einen von Natur aus konvexen Boden. Hinzu kam, daß die Isolation sich aufgrund radialer Druckspannung auch von sich aus nach oben wölbte. Drückte man in diese nach oben gewölbte Oberfläche die Befestigungsfüße ein, so war entweder die Befestigung im Randbereich unvollkommen oder im Mittelbereich zu tief, so daß die abstrahlende Fläche der Heizleiter zu gering wurde.This could not be achieved by pressing the insulating layer directly into the carrier shell. The carrier shell produced as a sheet metal plate usually had a naturally convex base. In addition, the insulation bulged upwards due to radial compressive stress. If the fastening feet were pressed into this curved surface, the fastening was either imperfect in the edge area or too deep in the central area, so that the radiating surface of the heating conductors was too small.

Man konnte auch nicht den Stempel wölben, weil die Wölbung der Wärmedämmschicht unvorhersehbar und ungleichmäßig war und außerdem eine gewölbte Form der die Heizleiter tragenden Oberfläche eine unzulässige Vergrößerung der Bauhöhe des Strahlungsheizkörpers bedeuten würde.The stamp could not be arched either because the curvature of the thermal insulation layer was unpredictable and uneven and, furthermore, a curved shape of the surface carrying the heat conductor would mean an inadmissible increase in the overall height of the radiant heater.

Bei der Erfindung wird sowohl die Herstellung des Wärmedämmformkörpers als auch die Anbringung der Heizleiter vorzugsweise in einer separaten Form außerhalb der Trägerschale vorgenommen und die so vorbereitete, mit dem Heizleiter bestückte einstückige Tablette in den leeren Blechteller eingelegt. Dabei stört ein konvexer Boden des Blechtellers keinesfalls, weil dadurch eher eine zusätzliche Luft-Isolierschicht entsteht. Die Tablette ist einstückig und vorzugsweise auch einschichtig, könnte jedoch auch als mehrschichtig verpreßt ausgebildet sein.In the invention, both the production of the molded thermal body and the attachment of the heating conductors are preferably carried out in a separate form outside the carrier shell and the one-piece tablet prepared in this way, fitted with the heating conductor, is placed in the empty sheet metal plate. A convex bottom of the plate plate does not interfere, because it creates an additional air-insulating layer. The tablet is in one piece and preferably also in one layer, but could also be formed as a multi-layer pressed.

Eine sichere und kippfreie Anbringung kann dadurch sichergestellt werden, daß die Trägerschale in ihrem Randbereich eine gegenüber dem Boden erhöhte, ringförmige Auflageschulter besitzt, auf der ein ggf. entsprechend abgesetzter Rand der Tablette aufliegt.A secure and tilt-free attachment can be ensured in that the carrier shell has in its edge region an annular support shoulder which is raised in relation to the floor and on which a correspondingly offset edge of the tablet rests.

Bei den Heizleitern kann es sich vorzugsweise um ein dünnes gewelltes Band aus Heizleitermaterial handeln, das aufrechtstehend auf dem Isolierkörper befestigt wird, indem es mit an das Band angeformten Befestigungsfüßen, die in Abstand voneinander vorstehen, aber ggf. auch über die ganze Heizleiterlänge durchgehen und/oder durch Lochungen unterbrochen sein können, eingepreßt sind. Diese sind entsprechend der Wellung des Bandes gewölbt und bilden somit spatenförmige und durch ihre Wölbung gestaltfeste Befestigungselemente, die auch in die fertiggestellte Tablettenoberfläche eingedrückt werden können.The heating conductors can preferably be a thin, corrugated band of heating conductor material which is fixed upright on the insulating body by means of fastening feet which are formed on the band and which protrude at a distance from one another, but possibly also extend over the entire length of the heating conductor and / or can be interrupted by perforations, are pressed. These are curved in accordance with the corrugation of the band and thus form spade-shaped fastening elements which are stable in shape due to their curvature and which can also be pressed into the finished tablet surface.

Diese und weitere Merkmale gehen außer aus den Ansprüchen auch aus der Beschreibung und den Zeichnungen hervor, wobei die einzelnen Merkmale jeweils für sich allein oder zu mehreren in Form von Unterkombinationen bei einer Ausführungsform der Erfindung und auf anderen Gebieten verwirklicht sein und vorteilhafte sowie für sich schutzfähige Ausführungen darstellen können, für die hier Schutz beansprucht wird. Die Unterteilung der Anmeldung in einzelne Abschnitte sowie Zwischen-Überschriften beschränken die unter diesen gemachten Aussagen nicht in ihrer Allgemeingültigkeit.These and further features emerge from the claims and also from the description and the drawings, the individual features being realized individually or in groups in the form of sub-combinations in one embodiment of the invention and in other fields be and can represent advantageous and protectable designs for which protection is claimed here. The division of the application into individual sections and subheadings do not limit the general validity of the statements made under these.

Kurzbeschreibung der ZeichnungBrief description of the drawing

Ein Ausführungsbeispiel der Erfindung ist in den Zeichnungen dargestellt und wird im folgenden näher erläutert. In den Zeichnungen zeigen:

Fig. 1
eine Form mit einem Stempel für einen ersten Herstellungsschritt,
Fig. 2
die Form mit einem Einpreßwerkzeug für einen zweiten Herstellungsschritt,
Fig. 3
eine perspektivische Detaildarstellung eines Heizleiterband-Abschnittes und
Fig. 4
in schematischer Darstellung wie Fig. 1 und 2, den fertiggestellten Strahlungsheizkörper.
An embodiment of the invention is shown in the drawings and is explained in more detail below. The drawings show:
Fig. 1
a mold with a stamp for a first manufacturing step,
Fig. 2
the mold with a press tool for a second manufacturing step,
Fig. 3
a detailed perspective view of a heating conductor section and
Fig. 4
in a schematic representation as Fig. 1 and 2, the completed radiant heater.

FigurenbeschreibungFigure description

Zur Herstellung eines Strahlungsheizkörpers 11 (Fig. 4) wird ein schüttbares Isoliermaterial 31 in eine in Fig. 1 und 2 gezeigte Form 12 eingefüllt und ggf. zum Vergleichmäßigen glattgestrichen. Die Form hat eines der Außenformen des Strahlungsheizkörpers etwa angepaßte Gestalt, muß mit dieser jedoch nicht genau übereinstimmen. Die Formausnehmung 33 kann vielmehr von der endgültigen Form, die das darin hergestellte Produkt haben soll, so abweichen, daß das Produkt nach seiner Verpressung und unter Berücksichtigung aller weiteren Zwischenschritte schließlich die gewünschte Endform erhält.To produce a radiant heater 11 (FIG. 4), a pourable insulating material 31 is filled into a mold 12 shown in FIGS. 1 and 2 and, if necessary, smoothed out for uniformity. The shape has an adapted shape of one of the outer shapes of the radiant heater, but need not exactly match this. Rather, the mold recess 33 can deviate from the final shape that the product manufactured therein is supposed to have in such a way that the product according to its Pressing and taking into account all further intermediate steps finally receives the desired final shape.

Bei dem Isoliermaterial handelt es sich um ein Kieselsäureaerogel, das pyrogen hergestellt ist und im unverpreßten Zustand eine staubförmige Konsistenz hat. Dieses Kieselsäureaerogel ist normalerweise mit Zusatzstoffen, wie Trübungsmitteln, die die Strahlungsdurchlässigkeit vermindern, Bindemitteln und/oder Verstärkungsmitteln zur Erhöhung der mechanischen Festigkeit, beispielsweise Fasern, vermischt. Es ist jedoch erwünscht und ein Vorteil der Erfindung, daß das separate Wärmedämm-Formteil faserfrei hergestellt werden kann.The insulating material is a silica airgel, which is pyrogenic and has a dust-like consistency when unpressed. This silica airgel is normally mixed with additives, such as opacifiers, which reduce the radiation transmission, binders and / or reinforcing agents to increase the mechanical strength, for example fibers. However, it is desirable and an advantage of the invention that the separate thermal insulation molded part can be produced without fibers.

In die Form kann ein Preßstempel 13 eingefahren werden, der das lose Schüttmaterial so verdichtet, daß eine handhabbare Tablette entsteht, die jedoch nicht soweit verdichtet ist, daß sie ihre guten Wärmedämmeigenschaften verlöre. Außer durch die Gestaltung der Formausnehmung kann auch durch die Gestaltung des Preßstempels, ggf. in Abweichung von der ebenen Form der Preßfläche 14, dafür gesorgt werden, daß das entstehende, im folgenden auch als Tablette bezeichnete, Wärmedämmformteil 15 eine ebene Oberfläche hat.A press ram 13 can be inserted into the mold, which compresses the loose bulk material in such a way that a manageable tablet is formed, but which is not so compacted that it loses its good thermal insulation properties. In addition to the design of the mold recess, the design of the press ram, possibly deviating from the flat shape of the pressing surface 14, can also ensure that the resulting thermal insulation molding 15, also referred to below as a tablet, has a flat surface.

In der gleichen Form oder ggf. in einer anderen Stützform oder auf einer Unterlage wird jetzt durch einen Einlegestempel 16 ein Heizleiterband 17 in die Oberfläche 18 des Wärmedämm-Formteils 15 teilweise eingedrückt. Dazu hat der Einlegestempel 16 Nuten 20 in seiner der Oberfläche 18 zugewandten Fläche 19. Die Nuten sind entsprechend der gewünschten Verlegung (Macroform) des Heizleiters angeordnet, beispielsweise spiralig oder mäanderförmig. Sie sind etwa so breit wie der Heizleiter.In the same form or, if necessary, in a different support form or on a base, a heating conductor strip 17 is now partially pressed into the surface 18 of the thermal insulation molded part 15 by an insertion stamp 16. For this purpose, the insertion punch 16 has grooves 20 in its surface 19 facing the surface 18. The grooves are arranged in accordance with the desired laying (macro shape) of the heating conductor, for example in a spiral or meandering manner. They are about as wide as the heating conductor.

Der Heizleiter 17 besteht beim dargestellten Beispiel aus einem in Fig. 3 näher dargestellten dünnen Band aus Heizleitermaterial. Die Dicke liegt meist nur bei wenigen hundertstell Millimetern, z.B. 0,04 - 0,07 mm, während die Höhe einige Millimeter beträgt. An der Unterkante des durchgehenden bandförmigen Bereiches 21 sind Befestigungsfüße 22 angeordnet, die mit dem Band einstückig durch entsprechendes Ausstanzen oder Ausschneiden angefertigt sind. Diese z.B. rechteckig oder trapezförmig begrenzten Befestigungsfüße sind, ebenso wie das Band, wellenartig gekrümmt, so daß das Band eine quer zu seiner Hauptrichtung verlaufende Wellung aufweist. Die Krümmungsachsen der Wellen stehen also senkrecht zur Oberfläche 18, 19.In the example shown, the heating conductor 17 consists of a thin strip of heating conductor material shown in more detail in FIG. 3. The thickness is usually only a few hundred millimeters, e.g. 0.04 - 0.07 mm, while the height is a few millimeters. Fastening feet 22 are arranged on the lower edge of the continuous band-shaped area 21, which are made in one piece with the band by corresponding punching or cutting. These e.g. Rectangular or trapezoid-shaped fastening feet, like the band, are curved in a wave-like manner, so that the band has a corrugation running transversely to its main direction. The axes of curvature of the waves are therefore perpendicular to the surface 18, 19.

Die Heizleiterbänder 17 werden in den Nuten 20 durch entsprechende Bemessung und federnde Anlage oder durch in den Einlegestempel eingebrachte Magnete gehalten, so daß die Befestigungsfüße 22 aus den Nuten 20 heraus über die untere Fläche 19 des Einlegestempels 16 herausstehen. So wird der Einlegestempel gegen die ebene Oberfläche 18 der Tablette 15 gedrückt, und zwar so weit, bis die Befestigungsfüße 22 in das vorverpreßte Material eingedrungen sind. Die Oberfläche 19 des Einlegestempels begrenzt die Stempelbewegung, die jedoch auch durch eine Steuerung entsprechend abgefangen werden kann. Dabei kann eine gewisse Nachverpressung erfolgen, was jedoch nicht zwingend notwendig ist. Dann wird der Stempel 16 hochgefahren, während die Heizleiter 17 an der Tablette 15 bleiben. Dies kann dadurch erleichtert werden, daß z.B. ein die Heizleiter haltender Elektromagnet abgeschaltet wird.The heating conductor strips 17 are held in the grooves 20 by appropriate dimensioning and resilient contact or by magnets introduced into the insertion stamp, so that the fastening feet 22 protrude from the grooves 20 beyond the lower surface 19 of the insertion stamp 16. Thus, the insertion stamp is pressed against the flat surface 18 of the tablet 15, namely until the fastening feet 22 have penetrated the pre-compressed material. The surface 19 of the insertion die limits the die movement, which, however, can also be intercepted accordingly by a control. A certain amount of repressing can take place, but this is not absolutely necessary. Then the stamp 16 is raised while the heating conductors 17 remain on the tablet 15. This can be facilitated by e.g. an electromagnet holding the heating conductor is switched off.

Danach wird das nunmehr mit dem Heizleiterband fest verbundene Wärmedämmformteil 15 aus der Form oder seiner Halterung entnommen und kann, ggf. nach einer Zwischenlagerung, als vorgefertigtes Teil in eine Blechträgerschale 23 eines Strahlungsheizkörpers eingelegt werden. Diese Blechträgerschale hat die Form einer flachen Schale mit einem gegenüber dem Boden 24 etwas erhöhten Rand 25, an den sich der vertikal hochragende Außenrand 26 anschließt. Die Tablette 15 hat einen entsprechend dieser Gestalt angeformten Boden, nämlich einen vertieften Bodenabschnitt 27, und einen demgegenüber nach oben abgesetzten Randbereich 28, der beim Einlegen der Tablette 15 auf der Auflageschulter 25 aufliegt.Thereafter, the thermal insulation molded part 15, which is now firmly connected to the heating conductor strip, is removed from the mold or its holder and can, if necessary after an intermediate storage, be used as prefabricated part can be inserted into a sheet metal carrier shell 23 of a radiant heater. This sheet metal carrier shell has the shape of a flat shell with an edge 25 which is somewhat raised in relation to the bottom 24 and which is adjoined by the vertically projecting outer edge 26. The tablet 15 has a base which is molded in accordance with this shape, namely a recessed base section 27, and an edge region 28 which is offset in comparison therewith and which rests on the support shoulder 25 when the tablet 15 is inserted.

Obwohl es möglich wäre, bei dem Wärmedämmformteil anschließend an die ebene Oberfläche 18 im Außenbereich einen hochstehenden Rand anzuformen, der den Außenrand 26 der Blech-Trägerschale 23 innen isoliert, ist es bevorzugt, einen gesonderten ringförmigen Rand 30 aus einem mechanisch etwas festeren und ebenfalls hochwärmebeständigem Dämm-Material, beispielsweise aus keramischen Fasern oder Vermiculite, einzulegen, der etwas über den Blech-Außenrand 26 hochragt und sich mit seiner Oberseite an die Unterseite einer Glaskeramikplatte 29 anlegt, die die Kochfläche bildet. Dieser Rand 30 dient dann auch gleichzeitig als Sicherung des Wärmedämmformteils in der Trägerschale und verhindert beispielsweise im Transport ein Abheben. Durch die großflächige Niederhaltung und die Tatsache, daß dieser Rand 30 unmittelbar über der Auflageschulter 25 angreift, wird das Wärmeformteil 11 lediglich durch geringe Druckkräfte belastet, wenn der Strahlungsheizkörper 11 federnd an die Unterseite der Glaskeramikplatte angedrückt wird. Im Durchmesser, d.h. in den horizontalen Abmessungen, kann das separate Wärmedämmformteil 25 etwas kleiner sein als die Trägerschale, so daß auch durch Wärme, Feuchtigkeit oder dgl. bedingte Ausdehnungen nicht zu einer Verspannung des Wärmedämmformteils führen.Although it would be possible to form an upstanding edge on the flat surface 18 in the outer region of the thermal insulation molded part, which insulates the outer edge 26 of the sheet metal carrier shell 23 on the inside, it is preferred to have a separate annular edge 30 made of a mechanically somewhat firmer and also highly heat-resistant Insert insulation material, for example made of ceramic fibers or vermiculite, which protrudes somewhat above the outer edge of the sheet metal 26 and rests with its top against the underside of a glass ceramic plate 29 which forms the cooking surface. This edge 30 then also serves at the same time to secure the thermal insulation molded part in the carrier shell and prevents it from being lifted off during transport, for example. Due to the large-area hold-down and the fact that this edge 30 engages directly above the support shoulder 25, the heat molded part 11 is only loaded by low compressive forces when the radiant heater 11 is pressed resiliently onto the underside of the glass ceramic plate. In diameter, that is to say in the horizontal dimensions, the separate heat-insulating molded part 25 can be somewhat smaller than the carrier shell, so that expansions caused by heat, moisture or the like do not lead to tensioning of the heat-insulating molded part.

Der entstehende Strahlungsheizkörper zeichnet sich also durch eine die Heizleiter tragende eben zu gestaltende Oberfläche mit gleichförmiger Einbett-Tiefe der Heizleiter aus, wobei dies unabhängig von der Form der Trägerschale ist, deren Boden 24 durchaus zufällig oder bewußt gewölbt sein könnte, um eventuellen Sprungscheibeneffekten bei der Erwärmung vorzubeugen. Durch die einlagige Isolierung aus hochwärmedämmendem und hochtemperaturbeständigem Material ist die Isolierung sehr wirksam und kostengünstig herzustellen. Aufgrund der geringen mechanischen Anforderungen kann weitgehend auf eine Armierung durch Fasern verzichtet werden.The resulting radiant heater is thus characterized by a surface to be designed that carries the heating conductors and has a uniform embedding depth of the heating conductors, this being independent of the shape of the support shell, the base 24 of which could be curved accidentally or deliberately, in order to avoid any spring washer effects in the process To prevent warming. Due to the single-layer insulation made of highly heat-insulating and high-temperature resistant material, the insulation is very effective and inexpensive to manufacture. Due to the low mechanical requirements, reinforcement by fibers can largely be dispensed with.

Die Oberfläche 18 des separaten Wärmedämmformteils 15 ist eben in dem Sinne, daß es der gewünschten Form genau entspricht. Die Oberfläche könnte beispielsweise auch aus zwei höhenmäßig gegeneinander versetzten Ebenen bestehen, wenn z.B. Heizleiter unterschiedlicher Höhe in verschiedenen Bereichen verwendet werden. Bevorzugt ist jedoch die möglichst genau parallel zur Unterkante der Glaskeramik verlaufende ebene Ausführung der Oberfläche 18, wobei dann auch die Oberkanten der Heizleiter in einer zur Glaskeramikfläche parallel liegenden Ebene liegen.The surface 18 of the separate thermal insulation molding 15 is flat in the sense that it corresponds exactly to the desired shape. The surface could, for example, also consist of two levels that are offset in height, for example if Heating conductors of different heights can be used in different areas. However, preference is given to the planar execution of the surface 18 running as precisely as possible parallel to the lower edge of the glass ceramic, the upper edges of the heating conductors then also lying in a plane lying parallel to the glass ceramic surface.

Claims (8)

Verfahren zur Herstellung eines Strahlungsheizkörpers (11) mit einer Trägerschale (23) und einer darin eingelegten Wärmedämmschicht (15), auf der ein Heizleiter (17) befestigt ist, dadurch gekennzeichnet, daß die Wärmedämmschicht (15) in einer gesonderten Form (12) als Tablette aus schüttbarem Wärmedämm-Material (31) mit im wesentlichen ebener Oberfläche (18) gepreßt wird, der Heizleiter (17) unter Teileinbettung des Heizleiters in das Wärmedämm-Material auf der Oberfläche (18) befestigt wird und die Tablette als einstückige Wärmedämmung in die leere Trägerschale (23) eingelegt wird.A method for producing a radiant heater (11) with a carrier shell (23) and a thermal insulation layer (15) inserted therein, on which a heating conductor (17) is attached, characterized in that the thermal insulation layer (15) in a separate form (12) as Tablet made of pourable thermal insulation material (31) with a substantially flat surface (18) is pressed, the heating conductor (17) is fixed with the heating conductor partially embedded in the thermal insulation material on the surface (18) and the tablet as a one-piece thermal insulation in the empty carrier shell (23) is inserted. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Teileinbettung im Bereich von vorstehenden Befestigungsfüßen (22) des Heizleiters vorgenommen wird.Method according to claim 1, characterized in that the partial embedding is carried out in the region of protruding fastening feet (22) of the heating conductor. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Heizleiter (17) in ein Einlegewerkzeug (16) eingelegt wird und mit seinen eingebetteten Teilen (22) in die Oberfläche der Tablette (15) hineingedrückt wird.Method according to claim 1 or 2, characterized in that the heating conductor (17) is inserted into an insertion tool (16) and its embedded parts (22) are pressed into the surface of the tablet (15). Verfahren nach einem der vorhergehenden Ansprüchen, dadurch gekennzeichnet, daß die Tablette (15) einschichtig ist und vorzugsweise überwiegend aus verpreßtem pyrogenem Kieselsäure-Aerogel besteht.Method according to one of the preceding claims, characterized in that the tablet (15) is in one layer and preferably consists predominantly of compressed pyrogenic silica airgel. Strahlungsheizkörper (11) mit einer Trägerschale (23) und einer darin eingelegten Wärmedämmschicht (15), auf der ein Heizleiter (17) befestigt ist, dadurch gekennzeichnet, daß die die Wärmedämmschicht (15) bildende Tablette im wesentlichen nur in ihrem Randbereich (28) direkt auf der Trägerschale (23) aufliegt.Radiant heater (11) with a carrier shell (23) and a thermal insulation layer (15) inserted therein, on which a heating conductor (17) is attached, characterized in that the tablet forming the thermal insulation layer (15) essentially only in its edge region (28) rests directly on the carrier shell (23). Strahlungsheizkörper nach Anspruch 5, dadurch gekennzeichnet, daß die Trägerschale (23) im Randbereich eine gegenüber ihrem Boden (24) erhöhte Auflageschulter (25) aufweist, auf der die die Wärmedämmschicht (15) bildende Tablette, ggf. mit einem entsprechenden Absatz (28), aufliegt, während im Bereich des Bodens ein Abstand zwischen dem Boden (27) der Tablette und dem Boden (24) der Trägerschale (23) besteht.Radiant heater according to claim 5, characterized in that the carrier shell (23) in the edge region has a support shoulder (25) which is raised relative to its base (24) and on which the tablet forming the thermal insulation layer (15), possibly with a corresponding shoulder (28). , rests, while in the area of the bottom there is a distance between the bottom (27) of the tablet and the bottom (24) of the carrier shell (23). Strahlungsheizkörper nach Anspruch 5 oder 6, dadurch gekennzeichnet, daß der Heizleiter (17) ein auf der Oberfläche (18) der Tablette (15) aufrechtstehendes, dünnes, gewelltes Band (21) aus metallischem Widerstandsmaterial ist, das nach unten vorstehende, vorzugsweise entsprechend der Wellung gewölbte Befestigungsfüße (22) aufweist, die in die Wärmedämmschicht (15) eingebettet sind.Radiant heater according to Claim 5 or 6, characterized in that the heating conductor (17) is a thin, corrugated band (21) which stands upright on the surface (18) of the tablet (15) and is made of metallic resistance material, which protrudes downwards, preferably according to Corrugation has arched fastening feet (22) which are embedded in the thermal insulation layer (15). Strahlungsheizkörper nach einem der Ansprüche 5 bis 7, dadurch gekennzeichnet, daß die Oberfläche (18) der Tablette (15) und/oder die Oberkante des Heizleiters je in einer Ebene liegen, wobei vorzugsweise die Ebenen zueinander parallel sind.Radiant heater according to one of claims 5 to 7, characterized in that the surface (18) of the tablet (15) and / or the upper edge of the heating conductor each lie in one plane, the planes preferably being parallel to one another.
EP96109730A 1995-06-23 1996-06-18 Radiant heater and method for its manufacture Expired - Lifetime EP0750444B2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE29624627U DE29624627U1 (en) 1996-06-18 1996-06-18 Producing electrical heating body for cooker hob - involves pressing heat barrier film on flat surface, with heat conductor attached to surface, and partially embedding heat barrier material
SI9630441T SI0750444T2 (en) 1995-06-23 1996-06-18 Radiant heater and method for its manufacture

Applications Claiming Priority (2)

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DE19522798 1995-06-23
DE19522798A DE19522798A1 (en) 1995-06-23 1995-06-23 Process for producing a radiant heater and radiant heater

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EP0750444A1 true EP0750444A1 (en) 1996-12-27
EP0750444B1 EP0750444B1 (en) 2001-12-05
EP0750444B2 EP0750444B2 (en) 2006-04-12

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EP (1) EP0750444B2 (en)
AT (1) ATE210363T1 (en)
DE (2) DE19522798A1 (en)
ES (1) ES2169175T5 (en)
SI (1) SI0750444T2 (en)
TR (1) TR199600520A2 (en)

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EP1229763A2 (en) * 2001-02-02 2002-08-07 Eika, S.Coop Flat resistance for heating a cooking plate
DE102006017998A1 (en) * 2006-04-07 2007-10-11 E.G.O. Elektro-Gerätebau GmbH Heating device for cooking hob has cover and heating device mounted on underside of cover, tubular heating body which is essentially flat and with diameter of less than 4 mm
DE102012002163A1 (en) 2012-01-31 2013-08-01 E.G.O. Elektro-Gerätebau GmbH Heating device, use of such a heater and method of manufacture
EP3115698A1 (en) 2015-07-09 2017-01-11 E.G.O. ELEKTRO-GERÄTEBAU GmbH Hotplate
EP3771287A1 (en) 2019-07-25 2021-01-27 E.G.O. Elektro-Gerätebau GmbH Radiation heating device and hob with such a radiation heating device

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EP1229763A2 (en) * 2001-02-02 2002-08-07 Eika, S.Coop Flat resistance for heating a cooking plate
EP1229763A3 (en) * 2001-02-02 2004-12-22 Eika, S.Coop Flat resistance for heating a cooking plate
DE102006017998A1 (en) * 2006-04-07 2007-10-11 E.G.O. Elektro-Gerätebau GmbH Heating device for cooking hob has cover and heating device mounted on underside of cover, tubular heating body which is essentially flat and with diameter of less than 4 mm
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WO2013113703A1 (en) 2012-01-31 2013-08-08 E.G.O. Elektro-Gerätebau GmbH Heating device, use of such a heating device and production method
EP3115698A1 (en) 2015-07-09 2017-01-11 E.G.O. ELEKTRO-GERÄTEBAU GmbH Hotplate
DE102015212916A1 (en) 2015-07-09 2017-01-12 E.G.O. Elektro-Gerätebau GmbH hob
EP3771287A1 (en) 2019-07-25 2021-01-27 E.G.O. Elektro-Gerätebau GmbH Radiation heating device and hob with such a radiation heating device

Also Published As

Publication number Publication date
SI0750444T1 (en) 2002-04-30
EP0750444B1 (en) 2001-12-05
TR199600520A2 (en) 1997-03-21
ATE210363T1 (en) 2001-12-15
DE59608342D1 (en) 2002-01-17
US5834740A (en) 1998-11-10
ES2169175T3 (en) 2002-07-01
ES2169175T5 (en) 2006-11-16
DE19522798A1 (en) 1997-01-02
SI0750444T2 (en) 2006-08-31
EP0750444B2 (en) 2006-04-12

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