EP0116861B2 - Corps de chauffe radiant électrique pour le chauffage de plaques de cuisson ou de plaques chaudes, en particulier plaques en vitro-céramique - Google Patents

Corps de chauffe radiant électrique pour le chauffage de plaques de cuisson ou de plaques chaudes, en particulier plaques en vitro-céramique Download PDF

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Publication number
EP0116861B2
EP0116861B2 EP84100541A EP84100541A EP0116861B2 EP 0116861 B2 EP0116861 B2 EP 0116861B2 EP 84100541 A EP84100541 A EP 84100541A EP 84100541 A EP84100541 A EP 84100541A EP 0116861 B2 EP0116861 B2 EP 0116861B2
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EP
European Patent Office
Prior art keywords
temperature sensor
heating
radiant heater
temperature
heater according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP84100541A
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German (de)
English (en)
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EP0116861A1 (fr
EP0116861B1 (fr
Inventor
Gerhard Gössler
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 Gerate Blanc und Fischer GmbH
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Publication date
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Application filed by EGO Elektro Gerate Blanc und Fischer GmbH filed Critical EGO Elektro Gerate Blanc und Fischer GmbH
Priority to AT84100541T priority Critical patent/ATE31463T1/de
Publication of EP0116861A1 publication Critical patent/EP0116861A1/fr
Application granted granted Critical
Publication of EP0116861B1 publication Critical patent/EP0116861B1/fr
Publication of EP0116861B2 publication Critical patent/EP0116861B2/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B1/00—Details of electric heating devices
    • H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H05B1/0202—Switches
    • H05B1/0216—Switches actuated by the expansion of a solid element, e.g. wire or rod
    • 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

Definitions

  • the invention relates to an electric radiant heater for heating glass ceramic hot plates, in particular.
  • Such a radiant heater has become known from US-A-3 710 076. It describes an electric hotplate with an insulating web running between two heating fields up to the glass ceramic plate, on which the rod-shaped temperature sensor, which is flattened on one side, lies in a channel and is pressed by the web onto the underside of the glass ceramic plate. It should sense the temperature of the glass ceramic and thus also the temperature of the cooking vessel on it. Particular emphasis is placed on the sufficient physical pressure of the temperature sensor on the glass ceramic plate and on preventing the temperature from being exceeded.
  • US-A 3 710 076 thus describes an electric radiant heater for heating glass ceramic hot plates or hot plates, with heating elements arranged at a distance from the plate in a heating zone and a temperature controller with a rod-shaped element which projects above the heating zone and extends above the level of the heating elements
  • Temperature sensor which is at least partially shielded from direct radiation coming from the heating elements by a web of insulating material on which it is arranged, and which rises considerably above the level of the heating elements, the web being arranged at a distance from the plate, as a result of which Temperature sensor (20, 20a) has a temporarily effective thermal shield.
  • US-A-4,350,875 describes a radiant heater with two or more separately switchable heating zones and its task is to avoid that the temperature sensor is influenced by the second, in addition to the first switchable heating zone, because otherwise it would affect the radiant heater if both Heating zone are switched on, would switch off at too low a temperature.
  • This is achieved by permanently shielding the part of the temperature sensor that protrudes beyond the outer activation heating zone.
  • the part of the temperature sensor protruding beyond the outer switch-on heating zone is arranged in an insulating block, which rests with its side parts on the underside of the glass ceramic plate and accommodates the temperature sensor arranged at a distance from the glass ceramic plate in a narrow slot facing the glass ceramic plate. Even if both heating zones are switched on together, the influence of the outer sensor section is permanently suppressed.
  • EP-A-37 638 shows a temperature sensor which is arranged on the bottom of the radiant heating dish and is shielded from the heating by means of shielding webs. This largely point-shaped electrical sensor should be heated up more quickly than the glass ceramic hotplate, so that it can trigger an early shutdown.
  • the object of the invention is to increase the power throughput in an electric radiant heater, which in itself is determined by the limitation of the surface temperature of the glass ceramic plate, in particular when it is being brought to a boil, without permanent damage to the hotplate or hotplate.
  • the temporarily effective shielding which prevents the temperature sensor from reaching the full temperature immediately in the heating or heating phase, enables a higher temperature level to be reached in this heating phase, which is then reduced to a steady state during further operation. It has been found that, in practice, the surface temperatures permitted for continuous operation can be exceeded temporarily without significant damage to the glass ceramic. This only occurs if the Maximum temperatures.
  • the invention can produce a parboil with a peak of about 880 K (610 ° C) at a permanent limit temperature set to 810 K (540 ° C), which subsides again within a few minutes. A parboil of 50 to 100 K above the permanent limitation temperature is advantageous.
  • a temperature controller When we speak of a temperature controller here, it is in most cases a fixed temperature monitor, which is particularly advantageously equipped with a rod-shaped temperature sensor, which consists of a quartz sleeve and a metal rod located therein.
  • a temperature controller should also be understood to mean adjustable temperature controllers which have a maximum setting adjusted to a maximum temperature. and regulators of other types, for example with pipes filled with expansion fluid or electrical resistance sensors.
  • the temperature sensor is at least partially shielded from direct radiation coming from the heating elements, it is exposed to the radiation coming from the plate essentially over its entire length.
  • the temperature sensor can be partially surrounded by thermal insulating material, preferably it is over part of its circumference and / or its length, preferably in its lower Peripheral portion, in contact with thermal insulation material. This insulating material is heated up more slowly by the heating elements, so that the temperature sensor heats up with a time delay.
  • This material shields the temperature sensor, which is advantageously embedded up to half of it, against the direct radiation of the heating elements lying laterally below it, but presents it with the projected surface of the plate seen from above, so that it responds particularly well to retroreflective heat.
  • the division of the heating elements into, for example, approximately semicircular heating zones has no significant disadvantages compared to the conventional spiral arrangement and hardly leads to a noticeable shadow in the area of the insulating web from above.
  • the temperature sensor protrudes over a large part of its length over the heating elements. Shortening or relocating to an edge area is usually out of the question because the temperature sensor should, if possible, sense the entire heating zone in order, for example, to react correctly even when the pan is displaced relative to the heating element.
  • the thermal sensitivity of the temperature sensor can advantageously be provided in a part in which thermal shielding is possible, for example in an unheated middle area. This part with increased sensitivity then experiences a time delay which has a corresponding effect on the overall control behavior. Nevertheless, the influence of the other controller sections is retained, albeit to a lesser extent.
  • the temperature sensor in particular its outer shell, consists of a material with low thermal conductivity. This not only promotes the effect in the case of response sensitivities which differ over the longitudinal direction, but also prevents temperature compensation around the circumference of the temperature sensor, which could have a negative effect on the delay in the response of the controller.
  • the radiant heater 11 shown in FIGS. 1 and 2 is arranged below a glass ceramic plate 12, the surface 13 of which forms a cooking surface.
  • the radiant heater 11 has a carrier shell 14 made of sheet metal, into which insulation is inserted.
  • the insulation is two-layered, the bottom layer 15 can be made of a very good thermal insulating material with no demands on the mechanical strength, while the upper insulation 16 consists of a mechanically somewhat stronger material, because its edge 17 by not shown on the carrier shell 14 acting spring elements is pressed onto the glass ceramic plate and heating elements 18 and a temperature sensor 20 are arranged on it.
  • the thermal insulating material, in particular for the upper insulating body 16, consists of a ceramic fiber, preferably of aluminum silicate, which is pressed to achieve sufficient strength. Such material is offered under the trade name "Fiberfrax".
  • the insulating body 16 has a shell shape surrounded by the edge 17 with a cavity 19, on the bottom of which the heating elements 18 are arranged such that they form an essentially circular heating zone 21, which however consists of two semicircular sections 22, 23.
  • the heating elements 18 are filaments made of electrical resistance wire, which are guided essentially parallel to one another and thus form two semicircles which essentially fill the surface uniformly and which change from one section to the other at a transition point 24.
  • the heating elements 18 are at a substantial distance from the glass ceramic plate.
  • a web 25 of the insulating body 16 extends longitudinally on a diameter line between the sections 22, 23 and rises considerably above the level of the heating elements and thus lies much closer to the glass ceramic plate 12 than the latter. 2, which can be seen in particular from FIG.
  • the temperature controller 30 is switched on with the snap switch 31 contained in it into the circuit of the heating elements, which in this case are designed as a continuous heating resistor, and controls them by switching them on and off.
  • the temperature controller is a temperature controller that is permanently adjusted to a limiting temperature and could also be referred to as a temperature monitor.
  • the temperature sensor consists of an expansion sleeve 33 made of quartz material and an expansion rod 43 located therein, attached to the sleeve at the end of the temperature sensor, with a larger coefficient of thermal expansion than the sleeve.
  • the heating elements heat up relatively quickly and heat the underside of the glass ceramic plate by radiation, which on the one hand passes this on through its radiation permeability and on the other hand through heat conduction to a cooking vessel (not shown) placed thereon.
  • the temperature sensor is not heated up as quickly as the surface of the glass ceramic plate, so that its expansion remains somewhat behind the temperature rise on the glass ceramic plate. This is due on the one hand to the fact that the temperature sensor is shielded from direct radiation, and on the other hand to its close proximity to the insulating material of the web 25, which only heats up after a long time.
  • the temperature sensor is largely heated by the reflection from the glass ceramic plate, the delay effect being increased by a cold cooking vessel placed on it.
  • the delay also occurs when the plate is idling without a cooking vessel.
  • the heating elements are only switched off for the first time at a temperature which is on the surface 13 of the glass ceramic plate 12 somewhat above the temperature for which the controller itself is adjusted.
  • the heating element 18a in this case is wound as a double spiral, i.e. as a spiral consisting of two resistance wire coils running parallel to one another, leaving an unheated zone 32 in the middle, the diameter of which corresponds to about a quarter to a third of the diameter of the entire heating zone 21a.
  • the temperature sensor 20a of the temperature controller 30a therefore protrudes in the area of the annular heating zone over the heating elements 18a, but lies in the area of the unheated middle zone 32 on a web 25a which, with the exception of its length, is of the same design as in FIGS. 1 and 2. Only in In this area there is a temporary thermal shield.
  • the thermal sensitivity of the temperature sensor is increased in this area, in that the expansion rod 43 in this area consists of a material with a higher thermal expansion coefficient than in the other areas of the temperature sensor 20a.
  • This can be done, for example, by welding a piece of rod made of a material with a different coefficient of thermal expansion.
  • Such material is commercially available and, for example, a combination of materials sold by Vacuumschmelze GmbH, Hanau, under the trade name "Vacodil” could be used, where Vacodil 74 has a specific thermal expansion of 31 x 10 ⁇ 6 / K has, while with Vacodil 36 this factor is 9.2 x 10 ⁇ 6 / K.
  • the controller does not act sluggishly and with a greater control amplitude than previous controllers without application of the invention due to the temporary shielding in the later stationary state.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Electric Stoves And Ranges (AREA)
  • Resistance Heating (AREA)

Claims (9)

  1. Corps de chauffe radiant électrique pour le chauffage de plaques de cuisson ou de plaques chaudes (12) en vitrocéramique, comprenant des éléments chauffants (18, 18a) situés à distance de la plaque (12) dans une zone chauffée (21), ainsi qu'un régulateur de température (30, 30a) pourvu d'une sonde thermométrique (20, 20a) en forme de barrette qui dépasse de la zone chauffée (21), s'étend au-dessus du plan des éléments chauffants (18) et est protégée au moins partiellement d'un rayonnement direct émanant des éléments chauffants (18, 18a), par l'intermédiaire d'une membrure (25) en matériau isolant sur laquelle elle est implantée, et qui s'élève considérablement au-dessus du plan des éléments chauffants, la sonde thermométrique (20, 20a) et la membrure (25) étant disposées à distance de la plaque (12), et la sonde thermométrique (20, 20a) étant exposée, sensiblement sur toute sa longueur, au rayonnement provenant de la plaque (12), de sorte que la sonde thermométrique (20, 20a) subit un écran thermique temporaire qui, durant la phase initiale respective de montée en température ou de cuisson, empêche la sonde thermométrique (20, 20a) d'atteindre immédiatement une température maximale, et qui autorise par conséquent, durant la phase initiale respective de montée en température ou de cuisson, une valeur de température de la plaque en vitrocéramique excédant une température de limitation permanente.
  2. Corps de chauffe radiant selon la revendication 1, caractérisé par le fait que la sonde thermométrique (20, 20a) dépasse, dans une large mesure, centralement de toute la zone chauffée (21).
  3. Corps de chauffe radiant selon la revendication 1 ou 2, caractérisé par le fait que la sonde thermométrique (20, 20a) est entourée partiellement d'un matériau thermiquement isolant en étant alors, sur une partie de sa périphérie et/ou de sa longueur, avantageusement dans sa région phériphérique inférieure, en contact avec ce matériau (16) thermiquement isolant.
  4. Corps de chauffe radiant selon l'une des revendications précédentes, caractérisé par le fait que la membrure (25, 25a) sépare au moins partiellement l'une de l'autre deux régions distinctes (22, 23) de la zone chauffée (21a).
  5. Corps de chauffe radiant selon la revendication 4, caractérisé par le fait que la membrure (25, 25a) consiste en un matériau isolant fibreux comprimé, tel qu'une fibre de silicate d'aluminium.
  6. Corps de chauffe radiant selon l'une des revendications précédentes, caractérisé par le fait que l'écran thermique temporaire est prévu sur une partie de la longueur de la sonde thermométrique (20a) dépassant de la zone chauffée (21a) ; et par le fait que la sensibilité de réaction thermique de la sonde thermométrique (20a) est accrue sur cette partie (32).
  7. Corps de chauffe radiant selon l'une des revendications précédentes, caractérisé par le fait que la sonde thermométrique (20a) dépourvue d'écran au voisinage de la zone chauffée (21a) au-dessus de laquelle elle s'étend est réalisée, dans une région centrale non chauffée (32), de façon à venir s'appliquer sur la membrure (25a) prévue seulement dans cette région non chauffée (32).
  8. Corps de chauffe radiant selon la revendication 6 ou 7, caractérisé par le fait qu'une sonde thermométrique (20a), fonctionnant avec une barrette et une gaine (33) à coefficients de dilatation thermique différents, présente, dans sa partie protégée par écran, des différences plus grandes entre les coefficients de dilatation thermique.
  9. Corps de chauffe radiant selon l'une des revendications précédentes, caractérisé par le fait que la sonde thermométrique (20, 20a), notamment sa gaine externe, consiste en un matériau à faible conductivité thermique.
EP84100541A 1983-01-26 1984-01-19 Corps de chauffe radiant électrique pour le chauffage de plaques de cuisson ou de plaques chaudes, en particulier plaques en vitro-céramique Expired - Lifetime EP0116861B2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84100541T ATE31463T1 (de) 1983-01-26 1984-01-19 Elektrischer strahlheizkoerper zur beheizung von koch- oder waermeplatten, insbesondere glaskeramikplatten.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3302489A DE3302489A1 (de) 1983-01-26 1983-01-26 Elektrischer strahlheizkoerper zur beheizung von koch- oder waermeplatten, insbesondere glaskeramikplatten
DE3302489 1983-01-26

Publications (3)

Publication Number Publication Date
EP0116861A1 EP0116861A1 (fr) 1984-08-29
EP0116861B1 EP0116861B1 (fr) 1987-12-16
EP0116861B2 true EP0116861B2 (fr) 1994-03-02

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ID=6189220

Family Applications (1)

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EP84100541A Expired - Lifetime EP0116861B2 (fr) 1983-01-26 1984-01-19 Corps de chauffe radiant électrique pour le chauffage de plaques de cuisson ou de plaques chaudes, en particulier plaques en vitro-céramique

Country Status (3)

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EP (1) EP0116861B2 (fr)
AT (1) ATE31463T1 (fr)
DE (2) DE3302489A1 (fr)

Families Citing this family (18)

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Publication number Priority date Publication date Assignee Title
GB8324271D0 (en) * 1983-09-10 1983-10-12 Micropore International Ltd Thermal cut-out device
GB2192279B (en) * 1983-09-10 1988-10-26 Micropore International Ltd Thermal cut-out device for radiant heaters
DE3502497A1 (de) * 1985-01-25 1986-07-31 Grünzweig + Hartmann und Glasfaser AG, 6700 Ludwigshafen Heizvorrichtung, insbesondere fuer eine strahlungsbeheizte kochplatte, sowie verfahren zu ihrer herstellung
AT381784B (de) * 1985-02-27 1986-11-25 Electrovac Vorrichtung zum regeln oder begrenzen der temperatur von strahlungs- oder kontaktheizkoerpern
DE3526783A1 (de) * 1985-07-26 1987-01-29 Ego Elektro Blanc & Fischer Strahlungs-heizeinheit
DE3536981A1 (de) * 1985-10-17 1987-04-23 Ako Werke Gmbh & Co Ueberhitzungsschutzschalter einer strahlungsbeheizung
DE3705260A1 (de) 1987-02-19 1988-09-01 Ego Elektro Blanc & Fischer Temperaturbegrenzer
DE8706277U1 (fr) * 1987-05-01 1987-06-25 E.G.O. Elektro-Geraete Blanc U. Fischer, 7519 Oberderdingen, De
DE3817113A1 (de) * 1988-05-19 1989-11-30 Ego Elektro Blanc & Fischer Strahlheizkoerper
DE3821495A1 (de) * 1988-06-25 1989-12-28 Ego Elektro Blanc & Fischer Temperaturschalter
DE3821496A1 (de) * 1988-06-25 1989-12-28 Ego Elektro Blanc & Fischer Temperaturschalter
DE3929965A1 (de) * 1989-09-08 1991-03-14 Ego Elektro Blanc & Fischer Temperaturschalter
DE4441204A1 (de) * 1994-11-19 1996-05-23 Ego Elektro Blanc & Fischer Strahlheizkörper
GB2340715B (en) * 1998-08-14 2003-01-29 Ceramaspeed Ltd Radiant electric heater
GB2360591B (en) * 2000-03-23 2004-04-28 Ceramaspeed Ltd Temperature sensor
DE102005005520A1 (de) * 2005-02-01 2006-08-10 E.G.O. Elektro-Gerätebau GmbH Heizeinrichtung mit Temperatursensor und Kochfeld mit Heizeinrichtungen
DE102008008604A1 (de) * 2008-02-12 2009-08-13 BSH Bosch und Siemens Hausgeräte GmbH Haushaltsgerät mit mindestens einer Kochstelle
DE102018001777A1 (de) 2018-03-06 2019-09-12 Sabrina Maurer Warmhaltezonen in Küchenarbeitsplatten und Verfahren zu deren Herstellung sowie heizbarer Gegenstand, Steuerung, automatischer Temperaturregelung von Warmhaltezonen in Küchenarbeitsplatten

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DE735491C (de) * 1937-10-14 1943-05-15 Theodor Stiebel Dipl Ing Dr Temperaturregler elektrisch beheizter Heisswasserspeicher
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DE2729929C3 (de) 1977-07-02 1981-10-08 Karl 7519 Oberderdingen Fischer Strahlungs-Heizeinheit für Glaskeramik-Elektrokochgeräte
DE7826549U1 (de) 1978-09-07 1978-12-14 E.G.O. Elektro-Geraete Blanc U. Fischer, 7519 Oberderdingen Temperaturbegrenzer fuer gasbeheizte glaskeramik-kochflaechen
DE2839161A1 (de) * 1978-09-08 1980-03-20 Ego Regeltech Temperaturbegrenzer fuer eine glaskeramik-kocheinheit
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DE3204119A1 (de) * 1981-02-10 1982-11-18 Micropore International Ltd., Droitwich, Worcestershire Elektroherd mit temperaturwarneinrichtung

Also Published As

Publication number Publication date
DE3468159D1 (en) 1988-01-28
ATE31463T1 (de) 1988-01-15
EP0116861A1 (fr) 1984-08-29
DE3302489A1 (de) 1984-07-26
EP0116861B1 (fr) 1987-12-16

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