EP0399178B1 - Cooker with a radiant heater - Google Patents

Cooker with a radiant heater Download PDF

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Publication number
EP0399178B1
EP0399178B1 EP90105904A EP90105904A EP0399178B1 EP 0399178 B1 EP0399178 B1 EP 0399178B1 EP 90105904 A EP90105904 A EP 90105904A EP 90105904 A EP90105904 A EP 90105904A EP 0399178 B1 EP0399178 B1 EP 0399178B1
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EP
European Patent Office
Prior art keywords
reflector
cooking
heating element
appliance according
cooking appliance
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EP90105904A
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German (de)
French (fr)
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EP0399178A1 (en
Inventor
Martin Thaler
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BOSCH-SIEMENS HAUSGERAETE GMBH
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Individual
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/22—Reflectors for radiation heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C7/00—Stoves or ranges heated by electric energy
    • F24C7/06—Arrangement or mounting of electric heating elements

Definitions

  • the invention relates to a cooking appliance with a radiant heating device according to the preamble of patent claim 1.
  • a parabolic reflector is assigned to the tubular or rod-shaped radiant heater, for example, which reflects the long-wave heat rays directed away from the food as a bundle of rays in the direction of the food to be treated.
  • the irradiated area is dimensioned relatively narrow, so that a plurality of radiant heaters and reflectors must be present in close proximity in order to obtain a larger irradiation area.
  • radiant heaters designed as halogen lamps are provided for heating a hotplate, with each halogen lamp being assigned two regions of the reflector which are essentially in the form of parabolic cylinder sections. In this way it should be achieved that even with a small number of lamps a homogeneous distribution of the radiation incident on the hotplate is obtained.
  • the reflector should have the best possible reflectivity and the lowest possible heat absorption capacity, with the latter Device additionally a cooling device in the form of a fan for the reflector is provided so that the temperature of the reflector can be kept relatively low.
  • the invention has for its object to improve the cooking device so that the thermal energy emanating from the radiant heater can be used as completely as possible for heating the food.
  • the efficiency of the radiant heating device can be further improved by providing the reflector with a thermally insulating coating on the surface facing away from the food to be cooked. In this way, practically all of the heat energy absorbed by the reflector is transported as secondary radiation in the direction of the food to be cooked.
  • the measure according to claim 3 optimizes the effectiveness of the reflected primary radiation emanating from the radiant heater and not emitted in the direction of the food by preventing bundling of this reflected primary radiation and obtaining a more uniform distribution of this reflected primary radiation over a larger area.
  • this measure is of importance when using tubular casing radiators as radiant heaters, with the angular radiation preventing undesired reflection of the primary radiation in the direction of the radiant heater or the radiant heater jacket.
  • a grill heater generally designated 2
  • a food support level 3 for example in the form of a grill, on which a food 4 to be heated, for example a piece of meat, is placed.
  • the grill radiator 2 consists of two spaced apart in the embodiment triangular tubular heaters 6, which are held on a frame-shaped grill holder 7, for example, which grill holder is in turn fastened to the upper muffle wall 1 by means of one or more rods 8.
  • the tubular heating elements consist of a closed metallic and triangular tube 61, in which a heating conductor 62 is located within an insulating filling.
  • the triangular shape of the tubular heating element increases its radiation surface facing the food 4 and the radiation surface facing the muffle wall 1 is kept as small as possible.
  • an axis plane 9 is indicated, which goes through the radiant heater axis and is perpendicular to the food support level 3.
  • the reflector consists of a thin metallic sheet material, preferably stainless steel sheet, with a sheet thickness of approximately 0.3 mm and thus has a small thermal mass.
  • the reflector has good heat absorption properties and a high corrosion resistance compared to the thermal energy emanating from the radiant heater 6.
  • the absorption properties can be obtained, for example, by the relatively dark design of the surface of the reflector 12 facing the radiant heater 6. This surface can be provided with a dark, absorption-friendly coating, or can be used without surface treatment of the raw material, the result being obtained even during relatively short-term operation Corrosion-related "blackening" of the sheet surface gives the reflector good absorption properties.
  • the reflector 12 has a reflector section 13 extending on both sides of the axis plane 9, the length dimension of which corresponds to the wide dimension of the tubular heating element 6 in the extent parallel to the reflection plane 10. At this reflector section 13 are followed at both ends by inclined reflector sections 14.
  • FIG. 3 a round tubular casing heating element 6 'being provided in this exemplary embodiment.
  • the reflector sections 14 are angled at an angle a of approximately 20 ° with respect to the reflector section 13.
  • the dimension b denotes the outer diameter of the tubular heating element 6 'and the length of the reflector section 13.
  • the triangular shape of the tubular heating element 6 increases the area of the tubular heating element radiating in the direction of the food 4 and keeps the area directed against the muffle wall 1 small.
  • the radiant heater according to FIGS. 2 and 3 is a round tubular casing heater 6 '.
  • the reflector section 131 of the reflector 121 directly adjacent to the axis plane 9 is divided into curved surfaces 132 on both sides of the axis plane 9, which curved surfaces extend away from the food to be cooked from the axis plane and are also curved thereafter. have reflector sections 133 extending in the direction of the food to be cooked.
  • the radiation arrows make it clear that the upward directed infrared rays emanating from the tubular casing heater 6 'are reflected at the reflector section 131 at an angle to the axis plane 9 that they pass the outer jacket of the tubular casing heater 6'.
  • the remaining infrared rays directed upwards or sideways are reflected at the reflector section 133 in a bundle-like manner and also at an angle to the axis plane 9 in the direction of the food to be cooked.
  • the reflector 122 is formed in a zigzag shape and, starting from the axis plane 9, has angularly rising, flat sections of the reflector section 134, the length of this reflector section 134 again corresponding to the width of the triangular tubular heating element 6.
  • the two flat sections of the reflector section 134 are in turn arranged starting from the axis plane 9 and away from the food to be cooked.
  • Downwardly inclined reflector sections 135 are arranged after the reflector section 132.
  • the ray path shown shows that the primary rays incident on the reflector sections 134 and 135 and emanating from the tubular heater 6 are reflected at an angle to the axis plane 9 and passing the tubular heater 6.
  • the reflector 6 is similar to the reflector shown in FIG. 4 and has an inner reflector section 136, the length of which corresponds to the diameter of the tubular heating element 6 '.
  • the region of the reflector section 137 which is drawn in the direction of the tubular casing heater 6 'and lies on the axial plane 9 is rounded.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electric Stoves And Ranges (AREA)
  • Control Of Resistance Heating (AREA)
  • Electric Ovens (AREA)
  • Baking, Grill, Roasting (AREA)
  • Cookers (AREA)

Abstract

The invention is based on a radiant heater for cookers with a radiant heating member (6) between a support plane (3) for items to be cooked and a reflector (12). In a known manner, such reflectors (12) are to have as low an absorption capacity and as high a reflection capacity for thermal radiation as possible. According to the invention, the output of thermal energy, which is active on the item to be cooked (4) and originates from the radiant heating member (6), is increased in that the reflector (12) has small thermal mass and good absorption properties in relation to thermal radiation. <IMAGE>

Description

Die Erfindung geht aus von einem Kochgerät mit einer Strahlungsheizeinrichtung gemäß dem Oberbegriff des Patentanspruches 1.The invention relates to a cooking appliance with a radiant heating device according to the preamble of patent claim 1.

Bei bekannten Strahlungsheizeinrichtungen (europäische Patentanmeldungen 147 340, 261 639) ist dem z.B. rohr- oder stabförmigen Strahlungsheizkörper ein parabolförmiger Reflektor zugeordnet, der die vom Gargut weggerichteten langwelligen Wärmestrahlen als Strahlenbündel in Richtung des zu behandelnden Gutes reflektiert. Hierdurch ist die bestrahlte Fläche relativ eng bemessen, so daß mehrere Strahlungsheizkörper und Reflektoren eng benachbart vorhanden sein müssen, um eine größere Bestrahlungsfläche zu erhalten. Bei einer anderen Strahlungsheizeinrichtung für Kochgeräte, (DE-OS 37 23 077) sind als Halogenlampen ausgebildete Strahlungsheizkörper für die Beheizung einer Kochplatte vorgesehen, wobei jeder Halogenlampe zwei im wesentlichen in Form parabelähnlicher Zylinderabschnitte ausgebildete Bereiche des Reflektors zugeordnet sind. Auf diese Weise soll erreicht werden, daß auch bei geringer Anzahl von Lampen eine homogene Verteilung der auf der Kochplatte auftreffenden Strahlung erhalten wird. In beiden Fällen soll der Reflektor ein möglichst gutes Reflexionsvermögen und ein möglichst geringes Wärmeabsorptionsvermögen haben, wobei bei der zuletzt genannten Einrichtung zusätzlich noch eine Kühleinrichtung in Form eines Gebläses für den Reflektor vorgesehen ist, so daß die Temperatur des Reflektors relativ niedrig gehalten werden kann.In known radiant heaters (European patent applications 147 340, 261 639), a parabolic reflector is assigned to the tubular or rod-shaped radiant heater, for example, which reflects the long-wave heat rays directed away from the food as a bundle of rays in the direction of the food to be treated. As a result, the irradiated area is dimensioned relatively narrow, so that a plurality of radiant heaters and reflectors must be present in close proximity in order to obtain a larger irradiation area. In another radiant heating device for cooking appliances (DE-OS 37 23 077), radiant heaters designed as halogen lamps are provided for heating a hotplate, with each halogen lamp being assigned two regions of the reflector which are essentially in the form of parabolic cylinder sections. In this way it should be achieved that even with a small number of lamps a homogeneous distribution of the radiation incident on the hotplate is obtained. In both cases, the reflector should have the best possible reflectivity and the lowest possible heat absorption capacity, with the latter Device additionally a cooling device in the form of a fan for the reflector is provided so that the temperature of the reflector can be kept relatively low.

Der Erfindung liegt die Aufgabe zugrunde, das Kochgerät so zu verbessern, daß die vom Strahlungsheizkörper ausgehende Wärmeenergie möglichst vollständig zur Erhitzung des Gargutes ausgenützt werden kann.The invention has for its object to improve the cooking device so that the thermal energy emanating from the radiant heater can be used as completely as possible for heating the food.

Diese Aufgabe wird gemäß der Erfindung gelöst durch die im Kennzeichnungsteil des Patentanspruches 1 aufgeführten Maßnahmen. Vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus den nachfolgenden Patentansprüchen.This object is achieved according to the invention by the measures listed in the characterizing part of claim 1. Advantageous embodiments of the invention result from the following patent claims.

Während man in der herkömmlichen Technik versucht hat, eine möglichst vollständige Reflexion der vom Strahlungsheizkörper ausgehenden Wärmestrahlung in Richtung des Gargutes zu erhalten und eine Absorption der Wärmestrahlung im Reflektor zu verhindern, hat sich nun überraschenderweise gezeigt, daß die direkte Reflexion der vom Strahlungskörper ausgehenden Primärstrahlung in der Wirkung auf das Gargut nur eine untergeordnete Rolle spielt, während der Heizwirkungsgrad wesentlich verbessert werden kann durch Erzeugung einer direkt vom Reflektor ausgehenden Eigenstrahlung des Reflektors (Sekundärstrahlung) bei starker Erhitzung des Reflektors durch die vom Strahlungsheizkörper ausgehende Wärmeenergie. Durch die guten Absorptionseigenschaften des Reflektors und die geringe Masse wird dieser Reflektor in kurzer Zeit auf eine hohe Temperatur von ca. 500° C gebracht womit vom Reflektor eine hochwirksame kurzwellige Sekundärstrahlung ausgeht und auf das Gargut unmittelbar einwirkt, und zwar über eine größere Fläche verteilt, als dies durch die unmittelbar vom Strahlungsheizkörper ausgehende Primärstrahlung möglich ist. Ein höherer Wirkungsgrad wird selbst dann erzielt, wenn man in Kauf nimmt, daß der stark erhitzte Reflektor Sekundärstrahlung nicht nur in Richtung des Gargutes, sondern auch in Gegenrichtung, also in Richtung der Garraum-Begrenzung abgibt, wobei letztgenannte Sekundärstrahlung praktisch unwirksam ist. Versuche haben gezeigt, daß 63 % der am Gargut wirksamen Wärmeenergie durch die vorgenannte Sekundärstrahlung erzielt wird, während der Anteil der am Gargut wirksamen Wärmeenergie durch Reflexion der vom Strahlungsheizkörper ausgehenden Primärstrahlung nur 37 % beträgt.While attempts have been made in conventional technology to obtain the most complete possible reflection of the thermal radiation emanating from the radiant heater in the direction of the food to be cooked and to prevent absorption of the thermal radiation in the reflector, it has now surprisingly been found that the direct reflection of the primary radiation emanating from the radiant body in the effect on the food only plays a subordinate role, while the heating efficiency can be significantly improved by generating a direct radiation from the reflector emanating directly from the reflector (secondary radiation) when the reflector is strongly heated by the thermal energy emanating from the radiant heater. Due to the good absorption properties of the reflector and the low mass, this reflector is quickly brought to a high temperature of approx. 500 ° C, which emits a highly effective short-wave secondary radiation and acts directly on the food, distributed over a larger area, than this by the immediately from Radiant radiator outgoing primary radiation is possible. A higher efficiency is achieved even if one accepts that the strongly heated reflector emits secondary radiation not only in the direction of the food, but also in the opposite direction, i.e. in the direction of the cooking space boundary, the latter secondary radiation being practically ineffective. Tests have shown that 63% of the heat energy effective on the food to be cooked is achieved by the aforementioned secondary radiation, while the proportion of the heat energy effective on the food to be cooked is only 37% due to reflection of the primary radiation emitted by the radiant heater.

Der Wirkungsgrad der Strahlungsheizeinrichtung läßt sich dadurch noch verbessern, daß der Reflektor an der dem Gargut abgewandten Fläche mit einer thermisch isolierenden Beschichtung versehen ist. Auf diese Weise wird praktisch die gesamte, vom Reflektor aufgenommene Wärmeenergie als Sekundärstrahlung in Richtung des Gargutes transportiert.The efficiency of the radiant heating device can be further improved by providing the reflector with a thermally insulating coating on the surface facing away from the food to be cooked. In this way, practically all of the heat energy absorbed by the reflector is transported as secondary radiation in the direction of the food to be cooked.

Durch die Maßnahme gemäß Patentanspruch 3 wird die Wirksamkeit der reflektierten, vom Strahlungsheizkörper ausgehenden und nicht in Richtung des Gargutes abgestrahlten Primärstrahlung optimiert, indem eine Bündelung dieser reflektierten Primärstrahlung verhindert wird und eine gleichmäßigere Verteilung dieser reflektierten Primärstrahlung über eine größere Fläche erhalten wird. Insbesondere ist diese Maßnahme von Bedeutung bei Verwendung von Mantelrohrheizkörpern als Strahlungsheizkörper, wobei durch die winkelige Abstrahlung eine unerwünschte Reflexion der Primärstrahlung in Richtung des Strahlungsheizkörpers bzw. der Strahlungsheizkörper-Mantels vermieden wird.The measure according to claim 3 optimizes the effectiveness of the reflected primary radiation emanating from the radiant heater and not emitted in the direction of the food by preventing bundling of this reflected primary radiation and obtaining a more uniform distribution of this reflected primary radiation over a larger area. In particular, this measure is of importance when using tubular casing radiators as radiant heaters, with the angular radiation preventing undesired reflection of the primary radiation in the direction of the radiant heater or the radiant heater jacket.

Weitere vorteilhafte Einzelheiten der Erfindung ergeben sich aus den in der Zeichnung dargestellten und nachstehend beschriebenen Ausführungsbeispielen.Further advantageous details of the invention result from the exemplary embodiments shown in the drawing and described below.

Es zeigt:

Fig. 1
eine schematische Darstellung der Strahlungsheizeinrichtung des Kochgerätes,
Fig. 2 und Fig. 3
ein erstes Ausführungsbeispiel eines runden Mantelrohrheizkörpers mit Reflektor in perspektivischer Darstellung und Draufsicht,
Fig. 4
ein zweites Ausführungsbeispiel mit einem runden Mantelrohrheizkörper und gewölbtem Reflektor in Draufsicht,
Fig. 5
ein drittes Ausführungsbeispiel mit einem dreieckförmigen Rohrheizkörper und zick-zack-förmigem Reflektor,
Fig. 6 und Fig. 7
weitere Ausführungsbeispiele von Reflektoren.
It shows:
Fig. 1
1 shows a schematic representation of the radiation heating device of the cooking appliance,
2 and 3
1 shows a first exemplary embodiment of a tubular tubular heating element with reflector in a perspective view and top view,
Fig. 4
a second embodiment with a round tubular heater and curved reflector in plan view,
Fig. 5
a third embodiment with a triangular tubular heater and zigzag reflector,
6 and 7
further embodiments of reflectors.

In Fig. 1 ist die obere Muffelwand 1 einer nicht weiter dargestellten Backofenmuffel gezeigt, unterhalb welcher mit geringem Abstand ein allgemein mit 2 bezeichneter Grillheizkörper angeordnet ist. Mit mehr oder weniger großem Luftabstand zum Grillheizkörper 2 befindet sich darunter eine Gargutträgerebene 3, z.B. in Form eines Grillrostes, auf die ein zu erhitzendes Gargut 4, z.B. ein Stück Fleisch aufgelegt ist. Der Grillheizkörper 2 besteht aus beim Ausführungbeispiel zwei mit Abstand voneinander angeordneten dreieckförmigen Rohrheizkörpern 6, die auf einer z.B. rahmenförmigen Grillhalterung 7 gehaltert sind, welche Grillhalterung wiederum mittels eines oder mehrerer Stäbe 8 an der oberen Muffelwand 1 befestigt ist. Die Rohrheizkörper bestehen aus einem geschlossenen metallischen und dreieckförmigen Rohr 61, in dem sich innerhalb einer Isolierfüllung ein Heizleiter 62 befindet. Durch die Dreiecksform des Rohrheizkörpers wird dessen dem Gargut 4 zugewandte Abstrahlfläche vergrößert und die der Muffelwand 1 zugewandte Abstrahlfläche möglichst gering gehalten. In Fig. 1 ist eine Achsebene 9 angedeutet, die durch die Strahlungsheizkörperachse geht und senkrecht auf der Gargutträgerebene 3 steht. Senkrecht zur Achsebene 9 verläuft eine Reflexionsebene 10, in welcher ein Reflektor 12 angeordnet ist. Der Reflektor besteht aus einem dünnen metallischen Blechmaterial, vorzugsweise aus Edelstahlblech, mit einer Blechstärke von ungefähr 0,3 mm und besitzt somit eine kleine thermische Masse. Ferner besitzt der Reflektor gute Wärmeabsorptionseigenschaften sowie eine gegenüber der vom Strahlungsheizkörper 6 ausgehenden Wärmeenergie hohe Korrosionsfestigkeit. Die Absorptionseigenschaften können z.B. erhalten werden durch relativ dunkle Gestaltung der dem Strahlungsheizkörper 6 zugewandten Oberfläche des Reflektors 12. Diese Oberfläche kann mit einem dunklen, absorptionsfreundlichen Überzug versehen sein, oder aber ohne Oberflächenbehandlung des Rohmaterials verwendet werden, wobei die sich schon bei relativ kurzzeitigem Betrieb einstellende korrosionsbedingte "Schwärzung" der Blechoberfläche dem Reflektor gute Absorbtionseigenschaften vermittelt. Der Reflektor 12 besitzt einen beidseitig der Achsebene 9 sich erstrekkenden Reflektorabschnitt 13, dessen Längenmaß dem breiten Maß des Rohrheizkörpers 6 in der Ausdehnung parallel zur Reflexionsebene 10 entspricht. An diesen Reflektorabschnitt 13 schließen sich beidenends geneigte Reflektorabschnitte 14 an. In Fig. 3 ist dies näher verdeutlicht, wobei bei diesem Ausführungsbeispiel ein runder Mantelrohrheizkörper 6' vorgesehen ist. Hierbei sind die Reflektorabschnitte 14 um den Winkel a von ca. 20° gegenüber dem Reflektorabschnitt 13 abgewinkelt. Das Maß b bezeichnet den Außendurchmesser des Mantelrohrheizkörpers 6' sowie die Länge des Reflektorabschnitts 13. Durch die Dreiecksform des Rohrheizkörpers 6 wird die in Richtung des Gargutes 4 strahlende Fläche des Rohrheizkörpers vergrößert und die gegen die Muffelwand 1 gerichtete Fläche klein gehalten.In Fig. 1, the upper muffle wall 1 of an oven muffle, not shown, is shown, below which a grill heater, generally designated 2, is arranged at a short distance. With a more or less large air gap to the grill heater 2 there is a food support level 3, for example in the form of a grill, on which a food 4 to be heated, for example a piece of meat, is placed. The grill radiator 2 consists of two spaced apart in the embodiment triangular tubular heaters 6, which are held on a frame-shaped grill holder 7, for example, which grill holder is in turn fastened to the upper muffle wall 1 by means of one or more rods 8. The tubular heating elements consist of a closed metallic and triangular tube 61, in which a heating conductor 62 is located within an insulating filling. The triangular shape of the tubular heating element increases its radiation surface facing the food 4 and the radiation surface facing the muffle wall 1 is kept as small as possible. In Fig. 1 an axis plane 9 is indicated, which goes through the radiant heater axis and is perpendicular to the food support level 3. A reflection plane 10, in which a reflector 12 is arranged, runs perpendicular to the axis plane 9. The reflector consists of a thin metallic sheet material, preferably stainless steel sheet, with a sheet thickness of approximately 0.3 mm and thus has a small thermal mass. Furthermore, the reflector has good heat absorption properties and a high corrosion resistance compared to the thermal energy emanating from the radiant heater 6. The absorption properties can be obtained, for example, by the relatively dark design of the surface of the reflector 12 facing the radiant heater 6. This surface can be provided with a dark, absorption-friendly coating, or can be used without surface treatment of the raw material, the result being obtained even during relatively short-term operation Corrosion-related "blackening" of the sheet surface gives the reflector good absorption properties. The reflector 12 has a reflector section 13 extending on both sides of the axis plane 9, the length dimension of which corresponds to the wide dimension of the tubular heating element 6 in the extent parallel to the reflection plane 10. At this reflector section 13 are followed at both ends by inclined reflector sections 14. This is illustrated in more detail in FIG. 3, a round tubular casing heating element 6 'being provided in this exemplary embodiment. Here, the reflector sections 14 are angled at an angle a of approximately 20 ° with respect to the reflector section 13. The dimension b denotes the outer diameter of the tubular heating element 6 'and the length of the reflector section 13. The triangular shape of the tubular heating element 6 increases the area of the tubular heating element radiating in the direction of the food 4 and keeps the area directed against the muffle wall 1 small.

Wie schon erwähnt, handelt es sich bei dem Strahlungsheizkörper gemäß Fig. 2 und 3 um einen runden Mantelrohrheizkörper 6'.As already mentioned, the radiant heater according to FIGS. 2 and 3 is a round tubular casing heater 6 '.

Beim Ausführungsbeispiel gemäß Fig. 4 ist der unmittelbar an die Achsebene 9 angrenzende Reflektorabschnitt 131 des Reflektors 121 unterteilt in gekrümmte Flächen 132 zu beiden Seiten der Achsebene 9, welche gekrümmte Flächen von der Achsebene aus sich vom Gargut entfernend verlaufen und im Anschluß daran ebenfalls gekrümmte, in Richtung des Gargutes verlaufende Reflektorabschnitte 133 besitzen. Durch die Strahlungspfeile ist verdeutlicht, daß die nach oben gerichteten, vom Mantelrohrheizkörper 6' ausgehenden Infrarotstrahlen am Reflektorabschnitt 131 so winkelig zur Achsebene 9 reflektiert werden, daß sie am Außenmantel des Mantelrohrheizkörpers 6' vorbeigehen. Die übrigen nach oben oder seitwärts gerichteten Infrarotstrahlen werden am Reflektorabschnitt 133 bündelartig und ebenfalls winkelig zur Achsebene 9 in Richtung des Gargutes reflektiert.In the exemplary embodiment according to FIG. 4, the reflector section 131 of the reflector 121 directly adjacent to the axis plane 9 is divided into curved surfaces 132 on both sides of the axis plane 9, which curved surfaces extend away from the food to be cooked from the axis plane and are also curved thereafter. have reflector sections 133 extending in the direction of the food to be cooked. The radiation arrows make it clear that the upward directed infrared rays emanating from the tubular casing heater 6 'are reflected at the reflector section 131 at an angle to the axis plane 9 that they pass the outer jacket of the tubular casing heater 6'. The remaining infrared rays directed upwards or sideways are reflected at the reflector section 133 in a bundle-like manner and also at an angle to the axis plane 9 in the direction of the food to be cooked.

Beim Ausführungsbeispiel gemäß Fig. 5 ist der Reflektor 122 zick-zack-förmig ausgebildet und besitzt von der Achsebene 9 ausgehend, winkelig ansteigende, ebene Abschnitte des Reflektorabschnittes 134, wobei die Länge dieses Reflektorabschnittes 134 wiederum der Breite des dreieckförmigen Rohrheizkörpers 6 entspricht. Die beiden ebenen Abschnitte des Reflektorabschnittes 134 sind wiederum von der Achsebene 9 ausgehend, sich vom Gargut entfernend angeordnet. Im Anschluß an den Reflektorabschnitt 132 sind nach unten geneigte Reflektorabschnitte 135 angeordnet. Auch hier zeigt der eingezeichnete Strahlenverlauf, daß die auf die Reflektorabschnitte 134 und 135 auftreffenden, vom Rohrheizkörper 6 ausgehenden Primärstrahlen winkelig zur Achsebene 9 und am Rohrheizkörper 6 vorbeigehend reflektiert werden.In the exemplary embodiment according to FIG. 5, the reflector 122 is formed in a zigzag shape and, starting from the axis plane 9, has angularly rising, flat sections of the reflector section 134, the length of this reflector section 134 again corresponding to the width of the triangular tubular heating element 6. The two flat sections of the reflector section 134 are in turn arranged starting from the axis plane 9 and away from the food to be cooked. Downwardly inclined reflector sections 135 are arranged after the reflector section 132. Here, too, the ray path shown shows that the primary rays incident on the reflector sections 134 and 135 and emanating from the tubular heater 6 are reflected at an angle to the axis plane 9 and passing the tubular heater 6.

Der Reflektor 123 gemäß Fig. 6 ist ähnlich dem in Fig. 4 gezeigten Reflektor ausgestaltet und besitzt einen inneren Reflektorabschnitt 136, dessen Länge dem Durchmesser des Mantelrohrheizkörpers 6' entspricht. Bei dem Reflektor 124 gemäß Fig. 7 ist der in Richtung des Mantelrohrheizkörpers 6' gezogene, auf der Achsebene 9 liegende Bereich des Reflektorabschnitts 137 verrundet ausgestaltet.6 is similar to the reflector shown in FIG. 4 and has an inner reflector section 136, the length of which corresponds to the diameter of the tubular heating element 6 '. In the reflector 124 according to FIG. 7, the region of the reflector section 137 which is drawn in the direction of the tubular casing heater 6 'and lies on the axial plane 9 is rounded.

Claims (10)

  1. Cooking appliance, in particular baking oven or grilling appliance, with a radiant heating equipment, with at least one radiant heating element between a cooking stock carrier plane and a reflector which is suitable for the delivery of secondary radiation caused by heating by means of the radiant heating element, characterised thereby, that the reflector (12; 121 to 124) consists of a thin metallic sheet material with a metal sheet thickness of approximately 0.3 millimetres and has an absorption surface which absorbs heat rays and faces the radiant heating element (6; 6') so that the reflector displays a small thermal mass and good absorption properties with respect to heat radiation and that the reflector is caused to radiate shortwave secondary rays due to heating to a temperature, which exceeds the cooking temperature, during the cooking treatment.
  2. Cooking appliance according to claim 1, characterised thereby, that the reflector consists of a corrosion-resistant metallic sheet material.
  3. Cooking appliance according to one of the preceding claims, characterised thereby, that the reflector (12; 121 to 124) in the region, which is directly adjacent at both sides of the axial plane (9), which passes through the radiant heating element axis and is perpendicular to the cooking stock carrier plane (3), comprises a reflector portion (13; 131, 134, 136, 137), which causes a reflection of the heat rays at an angle to the axial plane.
  4. Cooking appliance according to claim 3, characterised thereby, that the radiant heat element is a tubular heating element (6; 6'), preferably a casing tube heating element, and that the length of the reflector portion (13; 131, 134, 136, 137) corresponds to the external diameter of the tubular heating element.
  5. Cooking appliance according to claim 4, characterised thereby, that reflector portions (14, 135), which are inclined - preferably at 20° - relative to a reflection plane (10) perpendicular to the axial plane (9), adjoin the reflector portion (13; 134) at both ends.
  6. Cooking appliance according to one of the preceding claims, characterised thereby, that the reflector portion (13; 131, 134, 136, 137), which directly adjoins the axial plane (9), displays planar or curved surfaces, which are arranged one at an angle to the other and at an increasing distance from the cooking stock (4) away from the axial plane, at both sides of the axial plane.
  7. Cooking appliance according to claim 6, characterised thereby, that planar or curved reflector portions (14; 133, 135), which extend in the direction of the cooking stock, adjoin the planar or curved regions at both sides of the axial plane (9).
  8. Cooking appliance according to one of the preceding claims, characterised thereby, that the reflector is provided with a thermally insulating coating at the surface remote from the cooking stock.
  9. Cooking appliance according to one of the preceding claims, characterised thereby, that the tubular heating element (6) is flattened at the side remote from the cooking stock (4) and, adjoining thereat, comprises a tube casing portion which faces the cooking stock and the cross-sectional length of which exceeds that of the flattened part.
  10. Cooking appliance according to claim 9, characterised thereby, that the tubular heating element (6) has a triangular profile.
EP90105904A 1989-05-24 1990-03-28 Cooker with a radiant heater Expired - Lifetime EP0399178B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3917000 1989-05-24
DE3917000A DE3917000C2 (en) 1989-05-24 1989-05-24 Radiant heating device for cooking appliances

Publications (2)

Publication Number Publication Date
EP0399178A1 EP0399178A1 (en) 1990-11-28
EP0399178B1 true EP0399178B1 (en) 1994-10-12

Family

ID=6381357

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90105904A Expired - Lifetime EP0399178B1 (en) 1989-05-24 1990-03-28 Cooker with a radiant heater

Country Status (5)

Country Link
EP (1) EP0399178B1 (en)
AT (1) ATE112840T1 (en)
DD (1) DD298964A5 (en)
DE (2) DE3917000C2 (en)
ES (1) ES2063187T3 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220095832A1 (en) * 2019-02-06 2022-03-31 Hervé MÉLÉDO Even cooking of foodstuffs by means of a device allowing static isolation, focusing, channeling and modulation of energies

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4221626C2 (en) * 1992-07-01 1994-06-16 Kernforschungsz Karlsruhe Infrared radiant heater
KR960002662Y1 (en) * 1992-07-04 1996-03-30 주식회사 이멕스 Cooking vessels of oven
GB9409433D0 (en) * 1994-05-16 1994-06-29 Univ Cranfield High efficiency oven
GB2367887A (en) * 2000-10-09 2002-04-17 Mindy Tsao Electric oven with heat radiation reflection device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0261639A2 (en) * 1986-09-24 1988-03-30 Nippon Chemical Plant Consultant Co., Ltd. Far-infrared radiating system

Family Cites Families (5)

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Publication number Priority date Publication date Assignee Title
US3686477A (en) * 1971-08-06 1972-08-22 Gen Electric Mounting system for solid plate surface heating units
FR2556547B1 (en) * 1983-12-12 1986-09-05 Acir IMPROVED ELECTRICAL GENERATOR OF INFRARED RAYS CONSTITUTING ATMOSPHERE PURIFIER
US4629865A (en) * 1985-01-23 1986-12-16 Raytheon Company Electric oven with improved broiler
GB8523027D0 (en) * 1985-09-18 1985-10-23 Thorn Emi Appliances Grilling arrangement
DE3723077A1 (en) * 1987-07-11 1989-01-19 Bauknecht Hausgeraete BEAM RADIATOR FOR COOKING APPLIANCES

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0261639A2 (en) * 1986-09-24 1988-03-30 Nippon Chemical Plant Consultant Co., Ltd. Far-infrared radiating system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220095832A1 (en) * 2019-02-06 2022-03-31 Hervé MÉLÉDO Even cooking of foodstuffs by means of a device allowing static isolation, focusing, channeling and modulation of energies

Also Published As

Publication number Publication date
EP0399178A1 (en) 1990-11-28
DE3917000C2 (en) 2000-10-26
ATE112840T1 (en) 1994-10-15
DD298964A5 (en) 1992-03-19
ES2063187T3 (en) 1995-01-01
DE3917000A1 (en) 1990-11-29
DE59007428D1 (en) 1994-11-17

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