EP0750444B1 - Radiant heater and method for its manufacture - Google Patents
Radiant heater and method for its manufacture Download PDFInfo
- Publication number
- EP0750444B1 EP0750444B1 EP96109730A EP96109730A EP0750444B1 EP 0750444 B1 EP0750444 B1 EP 0750444B1 EP 96109730 A EP96109730 A EP 96109730A EP 96109730 A EP96109730 A EP 96109730A EP 0750444 B1 EP0750444 B1 EP 0750444B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tablet
- thermally insulating
- insulating layer
- heating conductor
- 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.)
- Expired - Lifetime
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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
- H05B3/74—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 support shell and one in it inserted insulation layer, on which a heating conductor is attached is, and such a radiant heater.
- DE 27 29 930 A is a radiation heating unit for Glass ceramic electric cooking devices have become known, in which one or more insulating layers from a carrier shell loose or slightly compacted bulk material. On these layers become a sheet of fibrous insulating material placed on the heating coils by embedding in the wet state are set. The plate is made by a revolving Edge held down. Here is the attachment of the heating conductor ideally done, but a two-layer Construction necessary.
- a radiant heater has become known from DE 28 06 367 A, in which a pourable insulating material in a Carrier shell filled and compressed with a stamp so that a surface forms on the heating coils can be stapled with wire clips. The surface need not be level.
- Heating coils have become known from EP 35 280 B, wherein a lower, thin layer of pourable insulating material is pressed directly into the carrier shell while over it a thicker layer of inorganic adhesive Aluminum silicate lies above it, which is the heating conductor can "stick".
- a method of making a radiant heater according to the first part of claim 1 and a Radiant heater according to the first part of the claim 5 is known from DE-U-9 419 922.
- a multilayer insulation structure is not only complex, but also in terms of its insulating effect inferior to a single-layer structure at least if one the layers consist of less good thermal insulation material. That is why the aim is to use one layer if possible to get by with the best thermal insulation material. there it is pourable insulating material that for Cohesion is pressed accordingly.
- the object of the invention is a method and a so to produce radiant heaters, which at simple manufacture and great effectiveness of the insulation perfect and even embedding of the Heating conductor allows.
- the invention is both the production of the molded thermal body as well as the attachment of the heating conductor preferably in a separate form outside the carrier shell made and the so prepared with the heat conductor Loaded one-piece tablet into the empty tin plate inserted.
- a convex base of the sheet metal plate interferes with this by no means, because it creates an additional layer of air insulation arises.
- the tablet is in one piece and is preferred also single-layer, but could also be multi-layered be pressed.
- the heating conductors can preferably be a thin one corrugated band of heating conductor material act upright is attached to the insulator by using it the tape integrally formed mounting feet that are spaced protrude from each other, but possibly also over the entire length of the heating conductor go through and / or interrupted by perforations can be pressed. These are according to the Corrugation of the band arched and thus form spades and through their curvature, form-fitting fasteners that also pressed into the finished tablet surface can be.
- the shape has one of the outer shapes of the Radiant heater approximately adapted shape, must with this but do not match exactly.
- the mold recess 33 can rather of the final form, which is what it produces Product should differ so that the product according to its Pressing and taking into account all further intermediate steps finally gets the desired final shape.
- the insulating material is a silica airgel, the pyrogenic is manufactured and in the uncompressed Condition has a dusty consistency.
- This silica airgel is usually with additives such as opacifiers, which reduce radiation transmission, binders and / or reinforcing means to increase the mechanical Strength, for example fibers, mixed. It is however desirable and an advantage of the invention that the separate Thermal insulation molding can be made fiber-free.
- a press ram 13 can be inserted into the mold the loose bulk material compacted so that a manageable Tablet is formed, but it is not compressed as much, that it would lose its good thermal insulation properties. Except by the design of the shape recess can also by Design of the press ram, possibly in deviation from the flat shape of the pressing surface 14, be ensured that the emerging, also referred to below as a tablet, Thermal insulation molding 15 has a flat surface.
- the grooves are corresponding to the desired laying (Macroform) of the heating conductor arranged, for example spiral or meandering. They are something like that wide as the heating conductor.
- the heating conductor 17 consists of the example shown a thin strip of heating conductor material shown in Fig. 3.
- the thickness is usually only a few hundred digits Millimeters, e.g. 0.04 - 0.07 mm while the height is a few millimeters.
- fastening feet 22 arranged with the tape in one piece by appropriate Punching or cutting are made.
- Rectangular or trapezoid-shaped mounting feet are, like the band, wavy curved, so that the Tape a curl across its main direction having.
- the axes of curvature of the waves are therefore perpendicular to the surface 18, 19.
- the heating conductor strips 17 are in the grooves 20 by appropriate Design and resilient system or by in the Inserted magnets held so that the Fastening feet 22 out of the grooves 20 over the lower one Stand out surface 19 of the insertion punch 16. So it will Insert stamp against the flat surface 18 of the tablet 15 pressed, until the mounting feet 22 in the pre-compressed material has penetrated.
- the surface 19 of the insertion stamp limits the stamp movement that but also intercepted accordingly by a controller can be. A certain amount of repressing can take place which, however, is not absolutely necessary. Then the Stamp 16 started up while the heating conductor 17 on the Tablet 15 stay. This can be facilitated that e.g. an electromagnet holding the heating conductor is switched off becomes.
- This sheet metal carrier shell has the shape of a flat bowl with one opposite the bottom 24 slightly raised edge 25 to which the vertical towering outer edge 26 connects.
- the tablet 15 has a shaped base according to this shape, namely a recessed bottom portion 27, and one opposite upwardly offset edge region 28, which when inserting the Tablet 15 rests on the support shoulder 25.
- annular rim 30 from a mechanical something firmer and also highly heat-resistant insulation material, for example from ceramic fibers or vermiculite, insert that protrudes slightly above the sheet metal outer edge 26 and with its top against the bottom of a glass ceramic plate 29 creates, which forms the cooking surface.
- This Edge 30 then also serves as a backup of the Insulated molded part in the carrier shell and prevents, for example take off in transport.
- the heat molded part 11 Due to the large area Restraint and the fact that this edge 30 immediately engages over the support shoulder 25, the heat molded part 11 only burdened by low compressive forces if the radiant heater 11 resiliently to the bottom of the Glass ceramic plate is pressed.
- the separate thermal insulation molding 25 In diameter, i.e. in the horizontal dimensions, the separate thermal insulation molding 25 be slightly smaller than the carrier shell, so that also due to heat, moisture or the like do not lead to distortion of the thermal insulation molded part.
- the resulting radiant heater is characterized by a surface to be designed to carry the heating conductor with a uniform embedding depth of the heating conductor, whereby this is independent of the shape of the carrier shell, the Floor 24 could be randomly or deliberately curved, for possible spring washer effects during heating to prevent. Thanks to the single-layer insulation made of highly heat-insulating and high temperature resistant material is the insulation very effective and inexpensive to manufacture. Because of The low mechanical requirements can largely be attributed to reinforcement by fibers can be dispensed with.
- the surface 18 of the separate thermal insulation molding 15 is in the sense that it corresponds exactly to the desired shape.
- the surface could be two levels offset from each other in terms of height, if e.g. Heating conductors of different heights in different Areas are used.
- this is preferred if possible exactly parallel to the lower edge of the glass ceramic flat design of the surface 18, and then also the upper edges of the heating conductors in one to the glass ceramic surface parallel plane.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Resistance Heating (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Constitution Of High-Frequency Heating (AREA)
- Aerials With Secondary Devices (AREA)
Abstract
Description
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 support shell and one in it inserted insulation layer, on which a heating conductor is attached is, and 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. DE 27 29 930 A is a radiation heating unit for Glass ceramic electric cooking devices have become known, in which one or more insulating layers from a carrier shell loose or slightly compacted bulk material. On these layers become a sheet of fibrous insulating material placed on the heating coils by embedding in the wet state are set. The plate is made by a revolving Edge held down. Here is the attachment of the heating conductor ideally done, but a two-layer Construction 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.A radiant heater has become known from
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 embedded in deep grooves Heating coils have become known from EP 35 280 B, wherein a lower, thin layer of pourable insulating material is pressed directly into the carrier shell while over it a thicker layer of inorganic adhesive Aluminum silicate lies above it, which is the heating conductor can "stick".
Ein Verfahren zur Herstellung eines Strahlungsheizkörpers gemäß dem ersten Teil des Anspruchs 1 und ein Strahlungsheizkörper gemäß dem ersten Teil des Anspruchs 5 ist aus DE-U-9 419 922 bekannt.A method of making a radiant heater according to the first part of claim 1 and a Radiant heater according to the first part of the claim 5 is known from DE-U-9 419 922.
Um eine stabile Lage der Isolierschichten zu gewährleisten, sind die Oberfläche der unteren Schicht bzw. die untere Fläche der oberen Schicht jeweils voneinander weggewölbt.To ensure a stable position of the insulation layers, are the surface of the lower layer or the lower one Surface of the upper layer 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 multilayer insulation structure is not only complex, but also in terms of its insulating effect inferior to a single-layer structure at least if one the layers consist of less good thermal insulation material. That is why the aim is to use one layer if possible to get by with the best thermal insulation material. there it is pourable insulating material that for Cohesion is pressed accordingly.
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 a method and a so to produce radiant heaters, which at simple manufacture and great effectiveness of the insulation perfect and even embedding of the Heating conductor allows.
Diese Aufgabe wird durch ein Verfahren nach Anspruch 1 und einen Strahlungsheizkörper nach Anspruch 5 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 and a radiant heater according to claim 5 solved. The production of the entire insulation from pourable high temperature resistant thermal insulation material as one Prefabricated tablet enables production in one size and form precisely measured form, especially can be ensured that after pressing the The surface of the tablet is even. In This flat surface can be used for the heating conductors that are in an otherwise flat stamp is received in grooves, from which they protrude with their mounting feet, so press in so that the feet are each equally deep in the surface be pressed in and accordingly the protruding one Part is always the same width if this is intended is.
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.When the insulation layer is pressed directly into the Carrier shell could not do this. As The sheet metal tray usually had one of Nature from convex floor. Add to that the isolation itself due to radial compressive stress also upwards by itself arched. You pressed into this curved surface the fastening feet, either the fastening was in Marginal area imperfect or too deep in the central area, see above that the radiating area of the heating conductor 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. You couldn't arch the stamp because of the curvature the thermal barrier coating was unpredictable and uneven and also a curved shape of the heat conductors Surface an impermissible increase in the overall height of the Radiant heater would mean.
Gemäß einer vorteilhaften Ausgestaltung 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.According to an advantageous embodiment The invention is both the production of the molded thermal body as well as the attachment of the heating conductor preferably in a separate form outside the carrier shell made and the so prepared with the heat conductor Loaded one-piece tablet into the empty tin plate inserted. A convex base of the sheet metal plate interferes with this by no means, because it creates an additional layer of air insulation arises. The tablet is in one piece and is preferred also single-layer, but could also be multi-layered be 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.This ensures a safe and tilt-free attachment be that the carrier shell in its edge area ring-shaped support shoulder raised against the floor has on which a correspondingly offset edge of the Tablet is resting.
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 one corrugated band of heating conductor material act upright is attached to the insulator by using it the tape integrally formed mounting feet that are spaced protrude from each other, but possibly also over the entire length of the heating conductor go through and / or interrupted by perforations can be pressed. These are according to the Corrugation of the band arched and thus form spades and through their curvature, form-fitting fasteners that also pressed into the finished tablet surface can be.
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 other features go beyond the claims also from the description and the drawings, wherein the individual features individually or separately several in the form of sub-combinations in one embodiment of the invention and in other fields be and advantageous as well as protective designs can represent, for which protection is claimed here. The division of the application into individual sections as well Inter-headings limit those made under them Statements are not generally applicable.
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.
- 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.
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 into one in FIGS. 1 and 2
Bei dem Isoliermaterial handelt es sich um ein Kieselsäure-aerogel, das pyrogen hergestellt ist und im unverpreßten Zustand eine staubförmige Konsistenz hat. Dieses Kieselsäure-aerogel 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, the pyrogenic is manufactured and in the uncompressed Condition has a dusty consistency. This silica airgel is usually with additives such as opacifiers, which reduce radiation transmission, binders and / or reinforcing means to increase the mechanical Strength, for example fibers, mixed. It is however desirable and an advantage of the invention that the separate Thermal insulation molding can be made fiber-free.
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
the loose bulk material compacted so that a manageable
Tablet is formed, but it is not compressed as much,
that it would lose its good thermal insulation properties. Except
by the design of the shape recess can also by
Design of the press ram, possibly in deviation from the
flat shape of the pressing surface 14, be ensured that the
emerging, also referred to below as a tablet,
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 is now on a pad by an insert stamp
16 a
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.The
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 in the
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.Then this is now firmly connected to the heating conductor tape
Thermal insulation molded
Obwohl es möglich wäre, bei dem Wärmedämmformteil anschließend
an die ebene Oberfläche 18 im Außenbereich einen hochstehenden
Rand anzuformen, der den Außenrand 26 der BlechTrägerschale
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 Wärmedämm-formteil
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 do so with the thermal insulation molding
an upright on the
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 characterized by
a surface to be designed to carry the heating conductor
with a uniform embedding depth of the heating conductor, whereby
this is independent of the shape of the carrier shell, the
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
Claims (8)
- A method of producing a radiant heater (11) comprising a carrier dish (23) and a thermally insulating layer (15) inserted therein, to the surface (18) of which, in being partially embedded in the thermally insulating material of said thermally insulating layer, a heating conductor (17) is secured, wherein said thermally insulating layer (15) is compressed in a separate mold (12) as a tablet of bulk-flowable thermally insulating material (31) having a substantially flat top surface (18) and said tablet is inserted in the vacant carrier dish (23) as an integral item of thermal insulation.
- The method as set forth in claim 1, wherein said partial embedding is undertaken in the portion of protruding fastening feet (22) of said heating conductor.
- The method as set forth in claim 1 or 2, wherein said heating conductor (17) is inserted in an insertion fixture (16) and is pressed into the surface of said tablet (15) together with its embedded parts (22).
- The method as set forth in any of the preceding claims,
wherein said tablet (15) is single-layer and consists preferably of compressed pyrogenic silicic acid aerogel. - A radiant heater (11) comprising a carrier dish (23) and a thermally insulating layer (15) inserted therein to which a heating conductor (17), in being partially embedded in the thermally insulating material of said thermally insulating layer, is secured, wherein said thermally insulating layer (15) consists of a tablet, compressed in a separate mold from said thermally insulating material , which rests directly on said carrier dish (23) substantially only in its edge portion (28).
- The radiant heater as set forth in claim 5, wherein said carrier dish (23) comprises in said edge portion a supporting shoulder (25) which is raised with respect to its bottom (24) on which said tablet forming said thermally insulating layer (15) is supported, where required, by a suitable offset (28), whilst in the region of the bottom a spacing exists between the bottom (27) of the tablet and the bottom (24) of the carrier dish (23).
- The radiant heater as set forth in claim 5 or 6, wherein said heating conductor (17) is a thin, corrugated strip (21) of metallic resistive material standing upright on said surface (18) of said tablet (15) which comprises fastening feet (22) curved preferably to comply with the corrugation and protruding downwards which are embedded in said thermally insulating layer (15).
- The radiant heater as set forth in any of the claims 5 to 7, wherein said top surface (18) of said tablet (15) and/or the top edge of said heating conductor each lie in a plane, these planes being preferably parallel to each other.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SI9630441T SI0750444T2 (en) | 1995-06-23 | 1996-06-18 | Radiant heater and method for its manufacture |
| 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 |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19522798 | 1995-06-23 | ||
| DE19522798A DE19522798A1 (en) | 1995-06-23 | 1995-06-23 | Process for producing a radiant heater and radiant heater |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0750444A1 EP0750444A1 (en) | 1996-12-27 |
| EP0750444B1 true EP0750444B1 (en) | 2001-12-05 |
| EP0750444B2 EP0750444B2 (en) | 2006-04-12 |
Family
ID=7765062
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP96109730A Expired - Lifetime EP0750444B2 (en) | 1995-06-23 | 1996-06-18 | Radiant heater and method for its manufacture |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US5834740A (en) |
| EP (1) | EP0750444B2 (en) |
| AT (1) | ATE210363T1 (en) |
| DE (2) | DE19522798A1 (en) |
| ES (1) | ES2169175T5 (en) |
| SI (1) | SI0750444T2 (en) |
| TR (1) | TR199600520A2 (en) |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2323762B (en) * | 1997-03-27 | 2001-01-31 | Ceramaspeed Ltd | Method of securing a heating element |
| DE19755114A1 (en) | 1997-12-11 | 1999-06-17 | Ego Elektro Geraetebau Gmbh | Radiators, in particular for kitchen appliances |
| ES1048230Y (en) * | 2001-02-02 | 2001-12-01 | Eika S Coop | ELECTRICAL RESISTANCE OF FLAT CALDEO FOR A KITCHEN PLATE. |
| GB0202957D0 (en) | 2002-02-08 | 2002-03-27 | Ceramaspeed Ltd | Method and apparatus for manufacturing an electric heater |
| DE102005036581A1 (en) * | 2005-08-01 | 2007-02-08 | Electrovac Ag | Heating tape for an electric heater, heater with such a heating tape and method for producing the heating tape |
| 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 |
| DE102007038782A1 (en) | 2007-08-06 | 2009-02-19 | E.G.O. Elektro-Gerätebau GmbH | Cover for the underside of a hotplate and manufacturing process and hotplate with such a cover and manufacturing process |
| GB0811980D0 (en) * | 2008-07-07 | 2008-07-30 | Ceramaspeed Ltd | Radiant electric heater |
| 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 |
| WO2014025248A1 (en) * | 2012-08-10 | 2014-02-13 | Vbc Electro-Heat Sdn. Bhd. | Mica warmer heater for electrical cook top |
| EP3116286A4 (en) | 2015-05-15 | 2017-04-19 | Shenzhen Foda Electric Co., Ltd. | Thermally-insulated temperature-controlled heating plate |
| DE102015212916A1 (en) | 2015-07-09 | 2017-01-12 | E.G.O. Elektro-Gerätebau GmbH | hob |
| DE102017222958A1 (en) | 2017-09-04 | 2019-03-07 | E.G.O. Elektro-Gerätebau GmbH | Heating device and method for producing a heating device |
| EP3451791B1 (en) | 2017-09-04 | 2020-03-25 | E.G.O. Elektro-Gerätebau GmbH | Heater and method for manufacturing same |
| DE102019211101A1 (en) | 2019-07-25 | 2021-01-28 | E.G.O. Elektro-Gerätebau GmbH | Radiant heating device and hob with such a radiant heating device |
Family Cites Families (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2729930A1 (en) * | 1977-07-02 | 1979-01-11 | Karl Fischer | Radiation heater for glass ceramic cooker hob - has insulating ring with rebate and base plate holding support plate for heating element |
| DE2551137C2 (en) * | 1975-11-14 | 1986-04-24 | E.G.O. Elektro-Geräte Blanc u. Fischer, 7519 Oberderdingen | Electric radiant heater for glass ceramic hotplates |
| GB1580909A (en) * | 1977-02-10 | 1980-12-10 | Micropore Internatioonal Ltd | Thermal insulation material |
| DE3164263D1 (en) * | 1980-03-05 | 1984-07-26 | Gruenzweig Hartmann Glasfaser | Thermal insulation device for a heating source |
| DE3519350A1 (en) † | 1985-05-30 | 1986-12-04 | E.G.O. Elektro-Geräte Blanc u. Fischer, 7519 Oberderdingen | RADIATION HEATING UNIT |
| DE3527413A1 (en) † | 1985-07-31 | 1987-02-12 | Ego Elektro Blanc & Fischer | ELECTRIC RADIATOR FOR HEATING HEATING AREAS AND METHOD AND DEVICE FOR PRODUCING THE SAME |
| GB8625556D0 (en) * | 1986-10-25 | 1986-11-26 | Micropore International Ltd | Radiant heaters |
| DE3828192A1 (en) † | 1988-08-19 | 1990-02-22 | Ego Elektro Blanc & Fischer | RADIANT RADIATOR AND METHOD AND DEVICE FOR PRODUCING IT |
| DE4019898A1 (en) * | 1990-06-22 | 1992-01-02 | Ego Elektro Blanc & Fischer | METHOD AND DEVICE FOR FIXING HEATING RESISTORS ON A CARRIER |
| DE4022292A1 (en) * | 1990-07-15 | 1992-01-16 | Ego Elektro Blanc & Fischer | ELECTRIC RADIATION HEATING ELEMENT |
| GB9102133D0 (en) * | 1991-01-31 | 1991-03-13 | Ceramaspeed Ltd | Radiant electric heaters |
| DE69406818T2 (en) * | 1993-02-11 | 1998-04-30 | Ceramaspeed Ltd | Electric heating element, its manufacture and use |
| GB2275161B (en) * | 1993-02-11 | 1996-05-15 | Ceramaspeed Ltd | Method of manufacturing a radiant electric heater |
| GB2275160B (en) * | 1993-02-11 | 1996-04-03 | Ceramaspeed Ltd | Method of manufacturing a radiant electric heater |
| DE4310613A1 (en) † | 1993-03-31 | 1994-10-06 | Wacker Chemie Gmbh | Microporous thermal insulation molded body |
| DE4331702A1 (en) * | 1993-09-17 | 1995-03-23 | Wacker Chemie Gmbh | Radiant heater, in particular for heating a glass ceramic hotplate |
| GB2285058B (en) * | 1993-12-24 | 1997-01-08 | Ceramaspeed Ltd | Radiant Electric Heater |
-
1995
- 1995-06-23 DE DE19522798A patent/DE19522798A1/en not_active Withdrawn
-
1996
- 1996-06-18 DE DE59608342T patent/DE59608342D1/en not_active Ceased
- 1996-06-18 AT AT96109730T patent/ATE210363T1/en active
- 1996-06-18 SI SI9630441T patent/SI0750444T2/en unknown
- 1996-06-18 EP EP96109730A patent/EP0750444B2/en not_active Expired - Lifetime
- 1996-06-18 ES ES96109730T patent/ES2169175T5/en not_active Expired - Lifetime
- 1996-06-18 US US08/666,668 patent/US5834740A/en not_active Expired - Lifetime
- 1996-06-20 TR TR96/00520A patent/TR199600520A2/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| TR199600520A2 (en) | 1997-03-21 |
| ES2169175T5 (en) | 2006-11-16 |
| ES2169175T3 (en) | 2002-07-01 |
| SI0750444T1 (en) | 2002-04-30 |
| DE19522798A1 (en) | 1997-01-02 |
| SI0750444T2 (en) | 2006-08-31 |
| US5834740A (en) | 1998-11-10 |
| EP0750444B2 (en) | 2006-04-12 |
| DE59608342D1 (en) | 2002-01-17 |
| EP0750444A1 (en) | 1996-12-27 |
| ATE210363T1 (en) | 2001-12-15 |
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