WO1990008449A1 - Combined microwave, infrared and convection oven - Google Patents

Combined microwave, infrared and convection oven Download PDF

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Publication number
WO1990008449A1
WO1990008449A1 PCT/CH1990/000007 CH9000007W WO9008449A1 WO 1990008449 A1 WO1990008449 A1 WO 1990008449A1 CH 9000007 W CH9000007 W CH 9000007W WO 9008449 A1 WO9008449 A1 WO 9008449A1
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WIPO (PCT)
Prior art keywords
infrared
food
air
oven
microwave
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Application number
PCT/CH1990/000007
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German (de)
French (fr)
Inventor
Wolfgang Frech
Original Assignee
Wolfgang Frech
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Filing date
Publication date
Application filed by Wolfgang Frech filed Critical Wolfgang Frech
Publication of WO1990008449A1 publication Critical patent/WO1990008449A1/en

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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
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/647—Aspects related to microwave heating combined with other heating techniques
    • H05B6/6482—Aspects related to microwave heating combined with other heating techniques combined with radiant heating, e.g. infrared heating
    • H05B6/6485—Aspects related to microwave heating combined with other heating techniques combined with radiant heating, e.g. infrared heating further combined with convection heating
    • 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
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves

Definitions

  • the present invention relates to a combined microwave, infrared and convection oven according to the preamble of claim 1.
  • Microwave ovens for kitchen use are widespread because they can save a lot of energy and time when heating and cooking food compared to conventional ovens or hot plates.
  • the pure microwave oven has the disadvantage that practically no frying or baking effect can be achieved with them and thus no crusts can be achieved in the case of foods which have not previously been fried in a conventional manner in the oven or pan.
  • crusts prepared in this way often become mushy in the microwave oven instead of crawling. This has led to the fact that most manufacturers of microwave ovens have started to install an infrared heating source in the devices in addition to the microwave source, which either through direct radiant heat or via the detour of hot air, in addition to the pure heating of the food by the microwaves, also a roast and Allow baking of the same.
  • infrared heating sources In the case of the use of pure radiant heat, electrical resistance elements in the form of heating coils are generally used as infrared heating sources. Since such infrared heating elements, however, require a heating phase and therefore only relatively low temperatures can be reached on the food surfaces in the short cooking time typical of the microwave oven, frying or baking of foods in the microwave oven often requires a preparation time that goes beyond the pure heating time by means of the microwaves, such that a baking and roasting phase must be connected upstream or downstream of the cooking of the food, during which the microwave source is not or with reduced power is in operation.
  • the present invention has for its object to provide a combined microwave, infrared and convection oven, which overcomes the disadvantages of the conventional microwave oven and which is also suitable for the preparation of potato dishes, pizzas, as well as grilled and fried dishes, etc. , resp. even with such problematic dishes "within a short preparation time of the order of a few minutes, gives good results.
  • FIG. 1 shows a schematic cross section through a first advantageous embodiment variant of a furnace according to the invention, without showing the component irrelevant to the invention
  • FIG. 2 shows a section through a conventional microwave oven in which the components relevant to the invention are inserted in the form of an insert
  • Fig. 3 is a front view of the insert according to Fig. 2, and
  • Fig. 4 is a schematic side view of a second advantageous embodiment of an oven according to the invention, without showing the components irrelevant to the invention.
  • FIG. 1 shows a simplified and schematic cross section of a first embodiment variant of a combined microwave, infrared and convection oven according to the invention.
  • a housing 1 and an advantageously transparent door 2 can be seen, so that a view of the food to be cooked is possible at any time.
  • the components required in a microwave oven such as the power supply unit, microwave transmitter, fan and timer, and security elements etc. are accommodated.
  • the furnace chamber 4 in the oven according to the invention is not separated from the rear part 3 by a continuous straight rear wall, but rather by a rear wall which is angled with respect to the depth of the device in such a way that two staggered wall parts 5 and 6 are formed serve as air guiding elements, the function of which is described below.
  • a advantageously arranged inclined grate 7, which can be connected to the door 2 or otherwise positioned using known means.
  • a second infrared heating element 9 of this type is arranged in the rear lower part of the oven space 4, advantageously in the area where the upper wall part 5 ends in front of the lower wall part 6.
  • An intermediate wall 10 is advantageously arranged above the rear part 3 of the furnace in such a way that an air duct 11 is formed, which is connected to the surroundings of the device via an air outlet opening 12, for example in the form of slots arranged next to one another in the housing 1.
  • the rear device part 3 is, as is customary in the case of a microwave oven, provided with an air inlet opening 13, for example likewise in the form of slots in the housing 1 arranged next to one another, through which a fan, not shown, sucks in cooling air for cooling the microwave transmitter, also not shown, as is shown in FIG Arrows is indicated. This air sucked into the interior of the device is guided to flow around the device components to be cooled and blown into the furnace chamber 4 via the passage 14 delimited by the two wall parts 5 and 6.
  • the infrared heating element 9 which advantageously extends over the entire length of the furnace space 4, and is strongly heated. It then flows past the items to be cooked, not shown here, located on the grate 7 and removes the moisture escaping from them in such a way that the formation of a steam shield around the items to be cooked, caused by the microwaves penetrating them, is prevented.
  • a support 15, which is advantageously part of the grill 7, ensures that the food, respectively. that this receiving dishes, not supported against the door 2 and thus can prevent the air flow from flowing around the food.
  • the hot and humid air exits the air duct 11 and the air outlet opening 12 from the combined microwave, infrared and convection oven according to the invention, as is also indicated by arrows.
  • the described arrangement of the air guiding elements in the form of the wall parts 5 and 6 and the intermediate wall 10, but also the infrared heating elements 8 and 9 and the grate 7 with the support 15 and the specifically coordinated functions of these elements have the effect that, as usual, of microwaves Diameter of the cooked food is simultaneously heated by the microwaves, ie cooked and baked and fried by the intense infrared rays that start practically instantaneously with full power when switched on.
  • the hot air stream flowing around the food to be cooked ensures that the infrared rays can act unhindered on the surfaces of the food to be cooked during the entire cooking time by continuously removing the steam shield that usually envelops the food to be cooked in the hot air. This prevents the food from being mushy due to excessive moisture on its surface, instead of being fried.
  • the optimal interaction of microwaves, infrared rays and hot air flow realized for the first time thanks to the invention enables foodstuffs such as potato dishes, breaded fish or breaded fish or breaded meat, pizzas, etc. with good, even unsuitable for preparation in microwave or combined microwave, infrared and convection ovens Prepare success in a microwave oven-typical short time with low energy consumption. It is generally no longer necessary to pre-fry the food for a long time using the conventional resistance heating elements or to subsequently grill after the microwave heating before switching on the microwave source.
  • the air guiding and infrared heating elements are not installed directly in the microwave oven as described above, but rather are housed in an insert which advantageously consists of ceramic elements and can be used essentially in an empty oven space designed as usual.
  • Fig. 2 illustrates schematically and in section a correspondingly equipped microwave oven.
  • the insert which is advantageously formed from ceramic plates 16 and inserted into the furnace chamber 4, the rear wall of which is specially designed to achieve optimal air flow and advantageously comprises mutually offset parts 5 'and 6' which partially overlap and a passage 14 for the air form. This results in a slightly smaller cooking chamber 4a than the oven chamber 4.
  • An intermediate wall 10 ′ adjoins the rear wall part 5 ′′, which merges into the rear ceramic plate 16 of the insert, which in turn delimits an air duct 11 ′ with a metal air duct boundary wall 10a.
  • the latter is connected to the appliance part 3 of the furnace via an opening 13a in such a way that a part of the cooling air drawn in through the air inlet opening 13 emerges from the device after flowing around the device components via this air duct 11 'and the air outlet opening 12.
  • the remaining part of the cooling air drawn into the furnace flows, similarly to the combination of the invention according to the invention 1, via a passageway 14a and the passageway 14 past the lower infrared heating element 9 as hot air into the cooking chamber 4a.
  • the hot air leaves the cooking chamber 4a via the air duct 11.
  • the infrared heating elements 8 and 9 which advantageously extend over the entire width of the insert, open out on both sides of the insert, advantageously in sockets 21.
  • the inclined grate 7, free-standing or by any type of suitable supporting elements positioned, is advantageously arranged removably in use.
  • Such an application is particularly useful and valuable if commercially available microwave ovens are to be converted into advantageous combined microwave, infrared and convection ovens according to the invention, which generally involves minimal effort, which essentially consists of the electrical connection of the infrared heating elements via a separate switch , can happen.
  • the use described also allows conventional new microwave ovens to be equipped with the parts relevant to the invention, which, due to the high number of such ovens, can be economically more interesting than the production of smaller series of combined microwave, infrared and convection ovens according to the invention.
  • Fig. 4 illustrates a second, advantageous embodiment of a combined microwave, infrared and convection oven according to the invention, in which the food can be arranged horizontally in the cooking space without risk of contamination of the infrared radiators.
  • This embodiment of the invention also has a housing 1 with an advantageously transparent door 2 and a rear part 3 which accommodates the various units such as power supply unit, magnetron, etc.
  • the oven or cooking chamber 4 is from this rear part 3 and generally from the housing 1 by an advantageously made of metallic material
  • This air flow heats up considerably at the infrared radiators 28 in such a way that it can absorb and remove the moisture escaping from the cooking or cooking product 31 around it.
  • the air flow then leaves the furnace chamber 4, for example through openings 32, and is led out of the housing 1, optionally mixed with the device cooling air, as described above.
  • the grate 33 receiving the food 31 can be arranged horizontally in this embodiment of a combined microwave, infrared and convection oven according to the invention become.
  • glass ceramic plates 24 and 26 as a cover for the infrared radiator 28 offers the possibility of shielding the latter from the negative effects of the microwaves by means of metal castings 34 and 35 which can be integrated in the glass ceramic plates 24 and 26 and which are indicated by dashed lines, in such a way that they are protected Service life significantly increased.
  • metal castings 34 and 35 which can be integrated in the glass ceramic plates 24 and 26 and which are indicated by dashed lines, in such a way that they are protected Service life significantly increased.
  • an outer jacket 23 made of ceramic material, for example of glass ceramic plates can also be provided, into which metal grids should also be inserted for the purpose of shielding the infrared radiators 28 from the microwaves.
  • Infrared radiators 28 are to be provided in the metal outer jacket 23 and / or in the metal grids or at least some of them, microwave passage channels 36, two of which are indicated in the drawing by dashed lines and through which the microwaves can enter the furnace chamber 4 unhindered.
  • This embodiment variant of a combined microwave, infrared and convection oven according to the invention is advantageous over the embodiment variant according to FIG. 1 and the insert according to FIGS. 2 and 3 in particular in all those oven applications where it is necessary to heat the food in a horizontal position and / or to cook and / or to cook. It is advantageously designed as a fully integrated kitchen appliance, but can also be used in existing microwave ovens if required.
  • the air flow can also be guided differently than described above, provided that it cooks the food around it or at least above and flows around under the grate 7 in a continuous flow principle and the air flowing into the furnace space is heated up.
  • halogen lights as infrared heating elements
  • other intensive infrared radiators can be used, provided they have extremely short heating times and wavelengths suitable for baking and roasting food. Quartz radiators, for example, are considered as such heating elements.
  • it can be provided in the combined microwave, infrared and convection oven according to the invention or in a conventional microwave oven which is equipped with an insert according to the invention that the infrared heating elements and the microwave transmitter are operated and switched independently of one another or together.
  • a circuit limits the total electrical power that can be absorbed by the furnace to, for example, 2000 watts, which can be used when the magnetron and / or fan is switched off for increased heating of the heating elements for the purpose of catalytically cleaning the Oven chamber and in particular the glass ceramic plates 24 to 26 in the embodiment variant according to FIG. 4.
  • Other modifications to the individual elements of the invention which are not familiar to the person skilled in the art and are not described above, are also conceivable and realizable.

Abstract

In order to extend the range of applications of a microwave oven and to enhance the quality and digestibility of the food heated, in particular cooked and baked, therein, a current of hot, dry air is guided by deflecting elements (23, 24, 25, 26; 27) in the oven or cooking chamber (4a) so as to circulate around the food being cooked on a grill (33). A crust rapidly forms on the surface of the food being cooked, because a vapour screen which would absorb the infrared rays from the heating elements (28) cannot form around the food being cooked. The food therefore becomes crisp on the outside while remaining juicy on the inside. This is difficult if not impossible to achieve with conventional microwave ovens, or demands a preparation time which is too long for microwave ovens. In addition, by means of suitable constructional measures, it is possible to prevent liquid dropping from the food (31) being cooked onto the infrared heating source located below the food.

Description

KOMBINIERTER MIKROWELLEN-. INFRAROT- UND KONVEKTIONSOFENCOMBINED MICROWAVE. INFRARED AND CONVECTION OVENS
Die vorliegende Erfindung betrifft einen kombinierten Mikrowellen-, Infrarot- und Konvektionsofen gemäss dem Oberbegriff des Patentanspruchs 1.The present invention relates to a combined microwave, infrared and convection oven according to the preamble of claim 1.
Mikrowellengeräte für den Küchengebrauch sind weit verbreitet da mit ihnen für das Erhitzen und Garen von Nahrungsmitteln gegenüber herkömmlichen Backofen oder Heizplatten wesentlich Energie und Zeit gespart werden kann. Die reinen Mikrowellenofen weisen allerdings den Nachteil auf, dass mit ihnen praktisch kein Brat- oder Backeffekt erzielt werden kan und somit bei nicht vorgängig in konventioneller Art im Backofen oder in der Pfanne knusprig gebratenen Speisen keine Krusten realisierbar sind. Derart vorgängig hergestellte Krusten werden in Mikrowellenofen zudem oft matschig anstatt krosch. Dies hat dazu geführt, dass die meisten Hersteller vo Mikrowellenofen dazu übergegangen sind, neben der Mikrowellenguelle auch eine Infrarotheizquelle in die Geräte einzubauen, die entweder durch direkte Strahlungswärme oder über den Umweg von Heissluft neben der reinen Erhitzung der Speisen durch die Mikrowellen auch ein Braten und Backen derselben ermöglichen. Als Infrarotheizguellen werden dabei i Falle der Verwendung der reinen Strahlungswärme in der Regel elektrische Widerstandselemente in Form von Heizschlangen verwendet. Da derartige Infrarotheizelemente allerdings eine Aufheizphase benötigen und damit auf der Speisenoberflächen i der für Mikrowellenofen typischen kurzen Kochzeit nur relativ niedrige Temperaturen erreichbar sind, bedingt ein Braten ode Backen von Nahrungsmitteln im Mikrowellenofen oft eine über die reine Erwärmungszeit mittels der Mikrowellen hinausgehend Zubereitungszeit, derart, dass dem Garen der Speisen eine Back- und Bratphase vor- oder nachgeschaltet werden uss, während welcher die Mikrowellenquelle nicht oder mit reduzierter Leistung in Betrieb ist. Da nahezu unverzüglich nach dem Einschalten der Mikrowellenquelle das in praktisch allen Nahrungsmitteln enhaltene Wasser zu verdunsten beginnt, derart, dass sich innert kürzester Zeit ein von den Infrarotwellen nur unter beachtlichen Verlusten durchdringbarer Dampfschild um das Kochgut herum bildet, wird der Brat- und Backeffekt der Infrarotheizguellen reduziert. Die teilweise Verwendung einer Luftumwälzung im Mikrowellenofen schafft diesbezüglich nur teilweise Abhilfe, da dies zwecks Vermeidung grosser Energieverluste in einem geschlossenen Kreislauf geschieht, was dazu führt, dass die umgewälzte Luft innert kürzester Zeit mit Wasserdampf gesättigt ist und die gewünschte Wirkung nur noch teilweise erbringt. Daraus resultiert, dass sämtliche heute auf dem Markt erhältlichen Mikrowellenofen trotz Kombination von Mikrowellen und Infrarotstrahlen und LuftZirkulation sich beispielsweise für die Zubereitung von Kartoffelspeisen wie Pommes-frites, Bratkartoffeln, Rösti und Kartoffelkroketten, aber auch für panierten Fisch oder paniertes Fleisch sowie Pizzen, Teigwaren und Brot nicht oder doch nur bedingt eignenMicrowave ovens for kitchen use are widespread because they can save a lot of energy and time when heating and cooking food compared to conventional ovens or hot plates. However, the pure microwave oven has the disadvantage that practically no frying or baking effect can be achieved with them and thus no crusts can be achieved in the case of foods which have not previously been fried in a conventional manner in the oven or pan. In addition, crusts prepared in this way often become mushy in the microwave oven instead of crawling. This has led to the fact that most manufacturers of microwave ovens have started to install an infrared heating source in the devices in addition to the microwave source, which either through direct radiant heat or via the detour of hot air, in addition to the pure heating of the food by the microwaves, also a roast and Allow baking of the same. In the case of the use of pure radiant heat, electrical resistance elements in the form of heating coils are generally used as infrared heating sources. Since such infrared heating elements, however, require a heating phase and therefore only relatively low temperatures can be reached on the food surfaces in the short cooking time typical of the microwave oven, frying or baking of foods in the microwave oven often requires a preparation time that goes beyond the pure heating time by means of the microwaves, such that a baking and roasting phase must be connected upstream or downstream of the cooking of the food, during which the microwave source is not or with reduced power is in operation. Since the water contained in practically all foods begins to evaporate almost immediately after the microwave source is switched on, in such a way that a steam shield that can only be penetrated by the infrared waves with considerable losses is formed around the food in a very short time, the frying and baking effect of the infrared heating source becomes reduced. The partial use of air circulation in the microwave oven only partially remedies this, since this is done in order to avoid large energy losses in a closed circuit, which means that the circulated air is saturated with water vapor within a very short time and only has the desired effect. The result of this is that, despite the combination of microwaves and infrared rays and air circulation, all microwave ovens available on the market today are suitable for the preparation of potato dishes such as French fries, fried potatoes, hash browns and potato croquettes, but also for breaded fish or breaded meat as well as pizzas, pasta and Bread is not suitable or only suitable to a limited extent
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, einen kombinierten Mikrowellen-, Infrarot- und Konvektionsofen zu schaf en, der die Nachteile der herkömmlichen Mikrowellenofen überwindet und der sich auch für die Zubereitung von Kartoffelspeisen, Pizzen, sowie von gegrillten und gebratenen Speisen usw. gut eignet, resp. auch bei solchen •-Problemspeisen" innerhalb kurzer Zubereitungszeit in der Grössenordnung von wenigen Minuten, gute Ergebnisse liefert.The present invention has for its object to provide a combined microwave, infrared and convection oven, which overcomes the disadvantages of the conventional microwave oven and which is also suitable for the preparation of potato dishes, pizzas, as well as grilled and fried dishes, etc. , resp. even with such problematic dishes "within a short preparation time of the order of a few minutes, gives good results.
Diese Aufgabe wird erfindungsgemäss mit einem kombinierten Mikrowellen-, Infrarot- und Konvektionsofen gelöst, wie er im Patentanspruch 1 definiert ist.This object is achieved according to the invention with a combined microwave, infrared and convection oven as defined in claim 1.
Im Folgenden werden vorteilhafte AusführungsVarianten erfindungsgemässer kombinierter Mikrowellen-, Infrarot- und Konvetionsofen anhand der Zeichnung beschrieben, wobei darauf verzichtet wird, die allgemein bekannten technischen Elemente die in Mikrowellenofen herkömmlicher Bauart vorhanden sind, z erläutern. In der Zeichnung zeigtIn the following, advantageous embodiment variants of combined microwave, infrared and convection ovens according to the invention are described with reference to the drawing, in which is omitted to explain the generally known technical elements that are present in conventional microwave ovens, z. In the drawing shows
Fig. 1 einen schematischen Querschnitt durch eine erste vorteilhafte Ausführungsvariante eines erfindungsgemässen Ofens, ohne Darstellung der erfindungsirrelevanten Komponente ,1 shows a schematic cross section through a first advantageous embodiment variant of a furnace according to the invention, without showing the component irrelevant to the invention,
Fig. 2 einen Schnitt durch einen herkömmlichen Mikrowellenofen, in den ein die erfindungsrelevanten Komponenten in Form eines Einsatzes eingesetzt sind,2 shows a section through a conventional microwave oven in which the components relevant to the invention are inserted in the form of an insert,
Fig. 3 eine Frontansicht des Einsatzes nach Fig. 2, undFig. 3 is a front view of the insert according to Fig. 2, and
Fig. 4 eine schematische Seitenansicht einer zweiten vorteilhaften Ausführungsvariante eines erfindungsgemässen Ofens, ohne Darstellung der erfindungsirrelevanten Komponenten.Fig. 4 is a schematic side view of a second advantageous embodiment of an oven according to the invention, without showing the components irrelevant to the invention.
In Fig. 1 ist vereinfacht und schematisch eine erste Ausführungsvariante eines erfindungsgemässen kombinierten Mikrowellen-, Infrarot- und Konvektionsofens im Querschnitt dargestellt. Man erkennt im wesentlichen ein Gehäuse 1 und eine vorteilhafterweise transparente Türe 2, damit der Blick auf das Kochgut jederzeit möglich ist. Im hinteren Teil 3 des Ofens sowie gegebenenfalls seitlich neben dem Ofenraum 4 sind wie üblich die in einem Mikrowellenofen notwendigen Komponenten wie Netzteil, Mikrowellensender, Ventilator und Schaltuhr sowie Sicherheitselemente etc. untergebracht. Der Ofenraum 4 ist im erfindungsgemässen Ofen im Gegensatz zu einem handelsüblichen Gerät dieser Art nicht durch eine durchgehende gerade Rückwand vom hinteren Teil 3 abgetrennt, sondern durch eine bezüglich der Tiefe des Gerätes derart abgekröpfte Rückwand, dass zwei versetzt angeordnete Wandteil 5 und 6 entstehen, die als Luftleitelemente dienen, deren Funktion weiter unten beschrieben ist. Im Ofenraum 4 ist ein vorteilhafterweise geneigter Rost 7 angeordnet, der mit der Türe 2 verbunden oder sonstwie mit bekannten Mitteln positioniert sein kann. Im vorderen oberen Bereich des Ofenraumes 4 ist ein erstes Infrarotheizelement 8, vorteilhafterweise in Form einer röhrenförmigen Halogenleuchte, beispielsweise wie sie in Filmleuchten verwendet wird, angeordnet. Im hinteren unteren Teil des Ofenraumes 4, vorteilhafterweise in dem Bereich, wo der obere Wandteil 5 vor dem unteren Wandteil 6 endet, ist ein zweites derartiges Infrarotheizelement 9 angeordnet.1 shows a simplified and schematic cross section of a first embodiment variant of a combined microwave, infrared and convection oven according to the invention. Essentially, a housing 1 and an advantageously transparent door 2 can be seen, so that a view of the food to be cooked is possible at any time. In the rear part 3 of the oven and, if necessary, to the side of the oven space 4, as usual, the components required in a microwave oven, such as the power supply unit, microwave transmitter, fan and timer, and security elements etc. are accommodated. In contrast to a commercially available device of this type, the furnace chamber 4 in the oven according to the invention is not separated from the rear part 3 by a continuous straight rear wall, but rather by a rear wall which is angled with respect to the depth of the device in such a way that two staggered wall parts 5 and 6 are formed serve as air guiding elements, the function of which is described below. In the furnace chamber 4 is a advantageously arranged inclined grate 7, which can be connected to the door 2 or otherwise positioned using known means. A first infrared heating element 8, advantageously in the form of a tubular halogen lamp, for example as used in film lamps, is arranged in the front upper region of the furnace chamber 4. A second infrared heating element 9 of this type is arranged in the rear lower part of the oven space 4, advantageously in the area where the upper wall part 5 ends in front of the lower wall part 6.
Vorteilhafterweise oberhalb des hinteren Teils 3 des Ofens ist eine Zwischenwandung 10 derart angeordnet, dass ein Luftkanal 11 entsteht, der über eine Luftaustrittsöffnung 12, beispielsweise in Form von nebeneinander angeordneten Schlitzen im Gehäuse 1, mit der Gerätumgebung verbunden ist. Der hintere Gerätteil 3 ist, wie bei Mikrowellenofen üblich, mit einer Lufteintrittsöffnung 13, beispielsweise ebenfalls i Form von nebeneinander angeordneten Schlitzen im Gehäuse 1, versehen, durch die ein nicht dargestellter Ventilator zur Kühlung des ebenfalls nicht dargestellten Mikrowellensenders Kühlluft ansaugt, wie dies anhand von Pfeilen angedeutet ist. Diese ins Geräteinnern eingesaugte Luft wird zum Umströmen de zu kühlenden Gerätekomponenten geführt und über den durch die beiden Wandteile 5 und 6 begrenzten Durchgang 14 in den Ofenraum 4 geblasen. Dabei strömt sie am sich vorteilhafterweise über die ganze Länge des Ofenraumes 4 erstreckenden Infrarotheizelement 9 vorbei und wird stark erhitzt. Sie strömt dann am hier nicht dargestellten, sich au dem Rost 7 befindlichen Kochgut vorbei und führt dabei die au diesem austretende Feuchtigkeit ab, derart, dass die Bildung eines DampfSchildes rund um das Kochgut herum, bewirkt durch die in dieses eindringenden Mikrowellen, verhindert wird. Ein Abstützung 15, die vorteilhafterweise Teil des Rostes 7 ist, stellt sicher, dass das Kochgut, resp. das dieses aufnehmende Geschirr, sich nicht gegen die Türe 2 abstützen und damit den Luftstrom am Umströmen des Kochgutes hindern kann. Nach dem Umströmen des Kochgutes tritt die heisse und feuchte Luft übe den Luftkanal 11 und die Luftaustrittsöffnung 12 aus dem erfindungsgemässen kombinierten Mikrowelln-, Infrarot- und Konvektionsofen aus, wie dies ebenfalls mittels Pfeilen angedeutet ist.An intermediate wall 10 is advantageously arranged above the rear part 3 of the furnace in such a way that an air duct 11 is formed, which is connected to the surroundings of the device via an air outlet opening 12, for example in the form of slots arranged next to one another in the housing 1. The rear device part 3 is, as is customary in the case of a microwave oven, provided with an air inlet opening 13, for example likewise in the form of slots in the housing 1 arranged next to one another, through which a fan, not shown, sucks in cooling air for cooling the microwave transmitter, also not shown, as is shown in FIG Arrows is indicated. This air sucked into the interior of the device is guided to flow around the device components to be cooled and blown into the furnace chamber 4 via the passage 14 delimited by the two wall parts 5 and 6. It flows past the infrared heating element 9, which advantageously extends over the entire length of the furnace space 4, and is strongly heated. It then flows past the items to be cooked, not shown here, located on the grate 7 and removes the moisture escaping from them in such a way that the formation of a steam shield around the items to be cooked, caused by the microwaves penetrating them, is prevented. A support 15, which is advantageously part of the grill 7, ensures that the food, respectively. that this receiving dishes, not supported against the door 2 and thus can prevent the air flow from flowing around the food. After flowing around the food, the hot and humid air exits the air duct 11 and the air outlet opening 12 from the combined microwave, infrared and convection oven according to the invention, as is also indicated by arrows.
Die beschriebene Anordnung der Luftleitelemente in Form der Wandteile 5 und 6 sowie der Zwischenwandung 10, aber auch der Infrarotheizelemente 8 und 9 und des Rostes 7 mit der Abstützung 15 und die gezielt aufeinander abgestimmten Funktionen dieser Elemente bewirken, dass das sich im wie üblich von Mikrowellen durchmessenen Ofenraum befindliche Kochgut gleichzeitig durch die Mikrowellen erhitzt, d.h. gegart und durch die intensiven und beim Einschalten praktisc augenblicklich mit voller Leistung einsetzenden Infrarotstrahlen gebacken und gebraten wird. Der das Kochgut umströmende heisse Luftstrom sorgt dafür, dass die Infrarotstrahlen während der gesamten Kochzeit ungehindert au die Oberflächen des Kochgutes einwirken können, indem der in Mikrowellenofen normalerweise das Kochgut umhüllende Dampfschild durch die Heissluft kontinuierlich abgetragen wird. Damit wird verhindert, dass das Kochgut wegen zu hoher Feuchtigkeit an seiner Oberfläche, matschig statt gebraten wird.The described arrangement of the air guiding elements in the form of the wall parts 5 and 6 and the intermediate wall 10, but also the infrared heating elements 8 and 9 and the grate 7 with the support 15 and the specifically coordinated functions of these elements have the effect that, as usual, of microwaves Diameter of the cooked food is simultaneously heated by the microwaves, ie cooked and baked and fried by the intense infrared rays that start practically instantaneously with full power when switched on. The hot air stream flowing around the food to be cooked ensures that the infrared rays can act unhindered on the surfaces of the food to be cooked during the entire cooking time by continuously removing the steam shield that usually envelops the food to be cooked in the hot air. This prevents the food from being mushy due to excessive moisture on its surface, instead of being fried.
Das dank der Erfindung erstmals realisierte optimale Zusammenwirken von Mikrowellen, Infrarotstrahlen und Heissluftstrom ermöglicht, selbst bis anhin für die Zubereitung in Mikrowellen- oder kombinierten Mikrowellen-, Infrarot- und Konvektionsofen ungeeignete Nahrungsmittel wie Kartoffelgerichte, panierter Fisch oder paniertes Fleisch, Pizzen etc. mit gutem Erfolg in mikrowellenofentypisch kurzer Zeit bei niedrigem Energieverbrauch zuzubereiten. Es ist dabe in der Regel nicht mehr notwendig, vor dem Einschalten der Mikrowellenquelle das Kochgut über längere Zeit mittels der herkömmlichen Widerstandsheizelemente vorzubraten oder anschliessend an die Mikrowellenerhitzung nachzugrilliere . In einer anderen vorteilhaften Ausführungs ariante der Erfindung sind die Luftleit- und Infrarotheizelemente nicht wie hiervor beschrieben direkt im Mikrowellenofen eingebaut, sondern in einem vorteilhafterweise aus Keramikelementen bestehenden Einsatz untergebracht, der im wesentlichen in einen wie üblich ausgestalteten leeren Ofenraum einsetzbar ist. Fig. 2 illustriert schematisch und im Schnitt einen entsprechend ausgerüsteten Mikrowellenofen. Man erkennt den vorteilhafterweise aus Keramikplatten 16 gebildeten und in den Ofenraum 4 eingesetzten Einsatz, dessen Rückwand zwecks Erreichung einer optimalen Luftführung speziell ausgebildet ist und vorteilhafterweise gegenseitig versetzt angeordnete Teile 5' und 6' umfasst, die sich teilweise überlappen und einen Durchgang 14 für die Luft bilden. Dadurch entsteht ein gegenüber dem Ofenraum 4 etwas verkleinerter Garraum 4a. An den Rückwandteil 5" εchliesst sich oben eine Zwischenwandung 10' an, die in die rückwärtige Keramikplatte 16 des Einsatzes übergeht, die ihrerseits mit einer metallenen Luftkanalbegrenzungswand 10a einen Luftkanal 11' begrenzt. Letzterer ist über eine Oeffnung 13a mit dem Geräteteil 3 des Ofens verbunden, derart, dass ein Teil der durch die Lufteintrittsöffnung 13 eingesogene Kühlluft nach dem Umströmen der Gerätekomponenten über diesen Luftkanal 11' und die Luftaustrittsöffnung 12 aus dem Gerät austritt. Der restliche Teil der in den Ofen eingesogenen Kühlluft strömt, ähnlich wie hiervor anhand des erfindungsgemässen kombinierte Mikrowellen-, Infrarot- und Konvektionsofens nach Fig. 1 beschrieben, über einen Durchgang 14a und den Durchgang 14 am unteren Infrarotheizelement 9 vorbei als Heissluft in den Garraum 4a. Nach dem Umströmen des sich auf dem Rost 7 befindlichen Kochgutes verlässt die Heissluft den Garraum 4a über den Luftkanal 11. Vor dem Austreten aus dem Gerät vermengt sie sich mit der durch den Luftkanal 11' geführten Kühlluft, derart, dass die aus dem Mikrowellenofen austretend Luft nicht mehr so heiss ist, dass sie gefährlich wäre. Wie sich aus Fig. 3 entnehmen lässt, münden die sich vorteilhafterweise über die ganze Breite des Einsatzes erstreckenden Infrarotheizelemente 8 und 9 beidseits des Einsatzes in vorteilhafterweise innerhalb der Keramikplatten 16 angeordnete Fassungen 21. Der schräg liegende Rost 7, freistehend oder durch jede Art geeigneter Abstützelemente positioniert, ist im Einsatz vorteilhafterweise herausnehmbar angeordnet. Ein derartiger Einsatz ist insbesondere dann sinn und wertvoll, wenn handelsübliche Mikrowellenofen zu erfindungsgemässen vorteilhaften kombinierten Mikrowellen-, Infrarot- und Konvektionsofen umgebaut werden sollen, was in der Regel mit minimem Aufwand, der im wesentlichen aus dem elektrischen Anschluss der Infrarotheizelemente über einen separaten Schalter besteht, geschehen kann. Damit ist eine Möglichkeit geschaffen, die Erfindung nicht nur Käufern von neuen, von Anbeginn an mit den erfindungsrelevanten Elementen ausgerüsteten Mikrowellenofen zugutekommen zu lassen, sondern auch Besitzern herkömmlicher Mikrowellenofen, insbesondere solchen ohne Heizschlangen. Andererseits gestattet der beschriebene Einsatz auch die Ausrüstung konventioneller neue Mikrowellenofen mit den erfindungsrelevanten Teilen, was aufgrund der hohen Fertigungszahlen solcher Ofen wirtschaftlich interessanter sein kann als die Herstellung kleinerer Serien erfindungsgemässer kombinierter Mikrowellen- Infrarot- und Konvektionsofen.The optimal interaction of microwaves, infrared rays and hot air flow realized for the first time thanks to the invention enables foodstuffs such as potato dishes, breaded fish or breaded fish or breaded meat, pizzas, etc. with good, even unsuitable for preparation in microwave or combined microwave, infrared and convection ovens Prepare success in a microwave oven-typical short time with low energy consumption. It is generally no longer necessary to pre-fry the food for a long time using the conventional resistance heating elements or to subsequently grill after the microwave heating before switching on the microwave source. In another advantageous embodiment of the invention, the air guiding and infrared heating elements are not installed directly in the microwave oven as described above, but rather are housed in an insert which advantageously consists of ceramic elements and can be used essentially in an empty oven space designed as usual. Fig. 2 illustrates schematically and in section a correspondingly equipped microwave oven. One recognizes the insert, which is advantageously formed from ceramic plates 16 and inserted into the furnace chamber 4, the rear wall of which is specially designed to achieve optimal air flow and advantageously comprises mutually offset parts 5 'and 6' which partially overlap and a passage 14 for the air form. This results in a slightly smaller cooking chamber 4a than the oven chamber 4. An intermediate wall 10 ′ adjoins the rear wall part 5 ″, which merges into the rear ceramic plate 16 of the insert, which in turn delimits an air duct 11 ′ with a metal air duct boundary wall 10a. The latter is connected to the appliance part 3 of the furnace via an opening 13a in such a way that a part of the cooling air drawn in through the air inlet opening 13 emerges from the device after flowing around the device components via this air duct 11 'and the air outlet opening 12. The remaining part of the cooling air drawn into the furnace flows, similarly to the combination of the invention according to the invention 1, via a passageway 14a and the passageway 14 past the lower infrared heating element 9 as hot air into the cooking chamber 4a. After flowing around the cooked items on the grate 7, the hot air leaves the cooking chamber 4a via the air duct 11. Before exiting the device mixes it with the cooling air led through the air duct 11 'in such a way that the air emerging from the microwave oven is no longer so hot that it would be dangerous. As can be seen from FIG. 3, the infrared heating elements 8 and 9, which advantageously extend over the entire width of the insert, open out on both sides of the insert, advantageously in sockets 21. The inclined grate 7, free-standing or by any type of suitable supporting elements positioned, is advantageously arranged removably in use. Such an application is particularly useful and valuable if commercially available microwave ovens are to be converted into advantageous combined microwave, infrared and convection ovens according to the invention, which generally involves minimal effort, which essentially consists of the electrical connection of the infrared heating elements via a separate switch , can happen. This creates a possibility of not only benefiting buyers of new microwave ovens equipped with the elements relevant to the invention from the outset, but also owners of conventional microwave ovens, in particular those without heating coils. On the other hand, the use described also allows conventional new microwave ovens to be equipped with the parts relevant to the invention, which, due to the high number of such ovens, can be economically more interesting than the production of smaller series of combined microwave, infrared and convection ovens according to the invention.
Fig. 4 illustriert eine zweite, vorteilhafte Ausführungsvariante eines erfindungsgemässen kombinierten Mikrowellen-, Infrarot- und Konvektionsofens, in welcher das Kochgut ohne Risiko der Verschmutzung der Infrarotstrahler horizontal im Garraum angeordnet werden kann. Auch diese Ausführungs ariante der Erfindung weist ein Gehäuse 1 mit einer vorteilhafterweiεe transparenten Türe 2 und einen die diversen Aggregate wie Netzteil, Magnetron, etc. aufnehmenden hinteren Teil 3 auf. Der Ofen- oder Garraum 4 ist von diesem hinteren Teil 3 und generell vomm Gehäuse 1 durch einen vorteilhafterweise aus metallischem Material bestehenden Aussenmantel 23 und innerhalb von diesem angeordneten Glaskeramikplatten 24, 25 und 26 isoliert. Zwischen dem Aussenmantel 23 und den Glaskeramikplatten 24, 25 und 26 liegt ein Luftkanal 27, in welchem oben und unten eine Mehrzahl von Infrarotstrahlern 28 angeordnet sind. Ein Ventilator 29, dem, wenn er nicht drehzahlgeregelt ist, eine Regelklappe 30 nachgeschaltet ist, sorgt dafür, dass im Luftkanal 27 vorteilhafterweise von vorne unten ein regulierbarer Luftstrom, wie er mittels der Pfeile angedeutet ist, nach vorne oben strömt, von wo er in den Ofenraum 4 eintritt. Dieser Luftstrom erhitzt sich an den Infrarotstrahlern 28 seh stark, derart, dass er während des Umströmens des Koch- oder Gargutes 31 die aus diesem austretende Feuchtigkeit aufnehmen und abführen kann. Anschliessend verlasst der Luftstrom den Ofenraum 4 beispielsweise durch Öffnungen 32 und wird aus dem Gehäuse 1 herausgeführt, gegebenenfalls vermischt mit der Gerätekühlluft, wie weiter oben beschrieben.Fig. 4 illustrates a second, advantageous embodiment of a combined microwave, infrared and convection oven according to the invention, in which the food can be arranged horizontally in the cooking space without risk of contamination of the infrared radiators. This embodiment of the invention also has a housing 1 with an advantageously transparent door 2 and a rear part 3 which accommodates the various units such as power supply unit, magnetron, etc. The oven or cooking chamber 4 is from this rear part 3 and generally from the housing 1 by an advantageously made of metallic material Outer jacket 23 and insulated from it arranged glass ceramic plates 24, 25 and 26. Between the outer jacket 23 and the glass ceramic plates 24, 25 and 26 there is an air duct 27 in which a plurality of infrared radiators 28 are arranged at the top and bottom. A fan 29, which is followed by a control flap 30, if it is not speed-controlled, ensures that a controllable air flow, as indicated by the arrows, advantageously flows from top to bottom in the air duct 27 to the top, from where it flows enters the furnace chamber 4. This air flow heats up considerably at the infrared radiators 28 in such a way that it can absorb and remove the moisture escaping from the cooking or cooking product 31 around it. The air flow then leaves the furnace chamber 4, for example through openings 32, and is led out of the housing 1, optionally mixed with the device cooling air, as described above.
Da sich die Infrarotstrahler 28 hinter Glaskeramikplappen 24 und 26 befinden und demnach weder durch vom Kochgut 31 herabtropfender Flüssigkeit noch von Dämpfen beschmutzt werde können, kann der das Kochgut 31 aufnehmende Rost 33 in dieser Ausführungsvariante eines erfindungsgemässen kombinierten Mikrowellen-, Infrarot- und Konvektionsofen horizontal angeordnet werden.Since the infrared radiators 28 are located behind glass ceramic plates 24 and 26 and therefore cannot be contaminated either by liquid dripping from the food 31 or vapors, the grate 33 receiving the food 31 can be arranged horizontally in this embodiment of a combined microwave, infrared and convection oven according to the invention become.
Die Verwendung von Glaskeramikplatten 24 und 26 als Abdeckung der Infrarotstrahler 28 bietet die Möglichkeit, letztere durc in den Glaskeramikplatten 24 und 26 integrierbare Metallgitte 34 und 35, die durch gestrichelte Linien angedeutet sind, vor den negativen Auswirkungen der Mikrowellen abzuschirmen, derart, dass sich deren Lebensdauer wesentlich erhöht. An Stelle eines metallenen Aussenmantelε 23 kann ebenfalls ein aus Keramikmaterial, beispielsweise aus Glaskeramikplatten bestehender Aussenmantel 23 vorgesehen werden, in die zwecks Abschirmung der Infrarotstrahler 28 vor den Mikrowellen ebenfalls Metallgitter eingelegt werden sollten. Zwischen den Infrarotstrahlern 28 sind im metallenen Aussenmantel 23 und/oder in den Metallgittern oder zumindest einzelnen derselben, Mikrowellen-Durchtrittskanäle 36 vorzusehen, von denen in der Zeichnung zwei durch gestrichelte Linien angedeutet sind, und durch welche die Mikrowellen ungehindert in den Ofenraum 4 eintreten können.The use of glass ceramic plates 24 and 26 as a cover for the infrared radiator 28 offers the possibility of shielding the latter from the negative effects of the microwaves by means of metal castings 34 and 35 which can be integrated in the glass ceramic plates 24 and 26 and which are indicated by dashed lines, in such a way that they are protected Service life significantly increased. Instead of a metal outer jacket 23, an outer jacket 23 made of ceramic material, for example of glass ceramic plates, can also be provided, into which metal grids should also be inserted for the purpose of shielding the infrared radiators 28 from the microwaves. Between Infrared radiators 28 are to be provided in the metal outer jacket 23 and / or in the metal grids or at least some of them, microwave passage channels 36, two of which are indicated in the drawing by dashed lines and through which the microwaves can enter the furnace chamber 4 unhindered.
Diese Ausführungsvariante eines erfindungsgemässen kombinierten Mikrowellen-, Infrarot- und Konvektionsofens ist gegenüber der Ausführungsvariante nach Fig. 1 und dem Einsatuz nach den Fig. 2 und 3 insbesondere in all jenen Ofenanwendungen vorteilhaft, wo es notwendig ist, das Kochgut in horizontaler Lage zu erhitzen und/oder zu kochen und/oder zu garen. Vorteilhafterweise wird sie als vollständig integriertes Küchengerät ausgeführt, kann aber bei Bedarf auch als Einsatz in bestehende Mikrowellenofen vorgesehen werden.This embodiment variant of a combined microwave, infrared and convection oven according to the invention is advantageous over the embodiment variant according to FIG. 1 and the insert according to FIGS. 2 and 3 in particular in all those oven applications where it is necessary to heat the food in a horizontal position and / or to cook and / or to cook. It is advantageously designed as a fully integrated kitchen appliance, but can also be used in existing microwave ovens if required.
Der Fachmann erkennt leicht, dass die Erfindung im Bereich der Mikrowellen- und kombinierten Mikrowellen-, Infrarot- und Konvektionsofen eine ganz erhebliche Verbesserung und Erweiterung von deren Einsatzmöglichkeiten bedeutet. Dabei ist es nicht notwendig, dass die einzelnen Teile der erfindungsgemässen Mittel in den hiervor anhand von zwei prinzipiellen Ausführungsvarianten beschrieben Arten angeordnet und konzipiert sind. Wesentlich ist allerdings, dass die sich daraus ergebende Lehre in vom Fachmann problemlos realisierbaren technischen Ausführungen verwirklicht ist. So ist es beispielsweise unerheblich, wie und wo das oder die unteren Infrarotheizelemente positioniert werden, vorausgesetzt, sie werden von eventuell vom Kochgut herabtropfender Flüssigkeit geschützt und das Kochgut wird beidseitig bestrahlt. Auch die Anordnung des Rostes ist frei wählbar, vorausgesetzt, der Luftstrom wird am Umströmen des Kocjgutes nicht gehindert. Der Luftström kann bei entsprechender Auslegung der Luftleitelemente auch anders geführt werden als hiervor beschrieben, vorausgesetzt, das Kochgut wird von ihm rundum oder zumindest oberhalb und unterhalb des Rostes 7 im Durchlaufprinzip umströmt und die in den Ofenraum einströmende Luft wird hoch erhitzt. Anstelle von Halogenleuchten als Infrarotheizelemente können andere intensive Infrarotstrahler verwendet werden, sofern sie extrem kurze Aufheizzeiten und für das Backen und Braten von Nahrungsmitteln geeignete Wellenlängen aufweisen. Als derartige Heizelemente gelten beispielsweise Quarzstrahler. Selbstverständlich kann im erfindungsgemässen kombinierten Mikrowellen-, Infrarot- und Konvektionsofen oder einem herkömmlichen Mikrowellenofen, der mit einem erfindungsgemässen Einsatz bestückt ist, vorgesehen werden, dass die Infrarotheizelemente und der Mikrowellensender unabhängig voneinander oder gemeinsam betrieben und geschalte werden. Vorteilhaft kann es diesbezüglich insbesondere sein, wenn eine Schaltung vorgesehen wird, die die gesamte vom Ofen aufnehmbare elektrische Leistung auf beispielsweise 2000 Watt begrenzt, wobei diese bei abgeschaltetem Magnetron und/oder Ventilator für eine erhöhte Erwaärmung der Heizelemente eingesetzt werden kann, zwecks katalytischer Reinigung des Ofenraumes und insbesondere der Glaskeramikplatten 24 bis 26 in der Ausführungsvariante gemäss Fig. 4. Auch andere, dem Fachmann geläufige hiervor nicht beschriebene Modifikationen an den einzelnen Elementen der Erfindung sind denk- und realisierbar. Those skilled in the art will readily recognize that the invention in the field of microwave and combined microwave, infrared and convection ovens means a very considerable improvement and expansion of their possible uses. It is not necessary for the individual parts of the means according to the invention to be arranged and designed in the ways described above using two basic design variants. It is essential, however, that the resulting teaching is implemented in technical versions that can be easily implemented by a person skilled in the art. For example, it is irrelevant how and where the lower infrared heating element (s) are positioned, provided they are protected from any liquid dripping from the food and the food is irradiated on both sides. The arrangement of the grate is also freely selectable, provided that the air flow is not prevented from flowing around the material. With an appropriate design of the air guiding elements, the air flow can also be guided differently than described above, provided that it cooks the food around it or at least above and flows around under the grate 7 in a continuous flow principle and the air flowing into the furnace space is heated up. Instead of halogen lights as infrared heating elements, other intensive infrared radiators can be used, provided they have extremely short heating times and wavelengths suitable for baking and roasting food. Quartz radiators, for example, are considered as such heating elements. Of course, it can be provided in the combined microwave, infrared and convection oven according to the invention or in a conventional microwave oven which is equipped with an insert according to the invention that the infrared heating elements and the microwave transmitter are operated and switched independently of one another or together. In this regard, it can be particularly advantageous if a circuit is provided that limits the total electrical power that can be absorbed by the furnace to, for example, 2000 watts, which can be used when the magnetron and / or fan is switched off for increased heating of the heating elements for the purpose of catalytically cleaning the Oven chamber and in particular the glass ceramic plates 24 to 26 in the embodiment variant according to FIG. 4. Other modifications to the individual elements of the invention, which are not familiar to the person skilled in the art and are not described above, are also conceivable and realizable.

Claims

PATENTANSPRÜCHE PATENT CLAIMS
1. Kombinierter Mikrowellen-, Infrarot- und Konvektionsofen mit durch eine Türe verschliessbarem Ofenraum (4) mit einem Rost (7) für die Aufnahme des Kochgutes (31) und mit einem oberen und einem unteren Heizelement (8, 9; 28) für das Erhitzen, Braten und Backen des Kochgutes (31) und in einem Geräteteil (3) zumindest einem Netzteil, einem Mikrowellensender, einer Steuerung und Schaltelementen sowie einem Ventilator (29) für das Ansaugen von Aussenluft zwecks Erzeugung eines LuftStromes im Ofen, dadurch gekennzeichnet, dass er Mittel (5, 6, 11; 27, 32) enthält, die den Luftstrom an zumindest einem Heizelement (9; 28) vorbeilenken, bevor er in den Ofenraum (4) eintritt und sie nach dem Umströmen des Kochgutes (31) aus dem Ofen abführt, dass der Rost (7; 33) so ausgelegt ist, dass der Luftstrom das Kochgut (31) Umströmen kann und dass das unterhalb des Rostes (7; 33) angeordnete Heizelement (9; 28) so angeordnet ist, dass es vor vom Kochgut (31) herabtropfender Flüssigkeit geschützt ist.1. Combined microwave, infrared and convection oven with a closable oven door (4) with a grate (7) for receiving the food (31) and with an upper and a lower heating element (8, 9; 28) for the Heating, roasting and baking the food (31) and in a device part (3) at least one power supply unit, a microwave transmitter, a control and switching elements and a fan (29) for drawing in outside air for the purpose of generating an air stream in the oven, characterized in that it contains means (5, 6, 11; 27, 32) which direct the air flow past at least one heating element (9; 28) before it enters the oven chamber (4) and after the food (31) flows around it from the Oven removes that the grate (7; 33) is designed so that the air flow can flow around the food (31) and that the heating element (9; 28) arranged below the grate (7; 33) is arranged so that it is in front scooped liquid dripping from the food (31) supports.
2. Kombinierter Mikrowellen-, Infrarot- und Konvektionsofen gemäss Anspruch 1, dadurch gekennzeichnet, dass die Mittel aus einer aus zwei gegeneinander versetzt angeordneten Teilen (5, 6) gebildeten Wand des Ofenraumes (4) , die einen sich im wesentlichen über die gesamte Wandbreite erstreckenden Durchgang (14) offen lassen, durch welchen die in den Geräteteil (3) eingesaugte Kühlluft in den Ofenraum (4) einleitbar ist und einem Luftkanal (11) bestehen, durch den der Ofenraum (4) mit der Gerätumgebung verbunden ist, und dass das untere Heizelement (9) in vertikaler Richtung gegenüber dem Rost (7) versetzt im Bereich des Durchganges (14) angeordnet ist und dass der Rost (7) im Ofenraum (4) geneigt angeordnet ist. 2. Combined microwave, infrared and convection oven according to claim 1, characterized in that the means consists of a wall of the oven chamber (4) formed from two mutually offset parts (5, 6), which is essentially over the entire wall width leave extending passage (14) open, through which the cooling air sucked into the device part (3) can be introduced into the furnace chamber (4) and an air duct (11) through which the furnace chamber (4) is connected to the surroundings of the device, and that the lower heating element (9) is arranged offset in the vertical direction in relation to the grate (7) in the region of the passage (14) and that the grate (7) in the furnace chamber (4) is arranged inclined.
3. Kombinierter Mikrowellen-, Infrarot- und Konvektionsofen nach Anspruch 2, dadurch gekennzeichnet, dass die Heizelemente (8, 9) Halogenleuchten sind, die sich im wesentlichen über die gesamte Breite des Ofenraumes (4) erstrecken und das sich auf dem Rost (7) befindliche Kochgut sowohl von oben wie auch von unten bestrahlen.3. Combined microwave, infrared and convection oven according to claim 2, characterized in that the heating elements (8, 9) are halogen lights which extend essentially over the entire width of the oven space (4) and which extend on the grate (7 ) irradiate the food to be cooked both from above and from below.
4. Kombinierter Mikrowellen-, Infrarot- und Konvektionsofen nach Anspruch 3, dadurch gekennzeichnet, dass das untere Heizelement (9) in Bodennähe im Bereich der versetzten Wandteile (5, 6) am Uebergang vom Durchgang (14) in den Ofenraum (4) und das obere Heizelement (8) diagonal gegenüber in Deckennähe angeordnet ist und dass der Luftkanal (11) gegenüber dem oberen Heizelement (8) in Deckennähe liegt.4. Combined microwave, infrared and convection oven according to claim 3, characterized in that the lower heating element (9) near the floor in the region of the offset wall parts (5, 6) at the transition from the passage (14) into the oven space (4) and the upper heating element (8) is arranged diagonally opposite in the vicinity of the ceiling and that the air duct (11) is located in relation to the upper heating element (8) in the vicinity of the ceiling.
5.Kombinierter Mikrowellen-, Infrarot- und Konvektionsofen nach Anspruch 4, dadurch gekennzeichnet, dass der Rost (7) mi einer Abstützung (15) verbunden ist, die verhindert, dass sic das auf dem gegen die Türe (2) hin geneigten Rost (7) befindliche Kochgut gegen die Türe (2) abstützt, derart, dass im Bereich wo Rost (7) und Türe (2) einander begegnen jederzeit ein freier Spalt verbleibt, durch den hindurch die Luft im Ofenraum (4) strömen kann.5. Combined microwave, infrared and convection oven according to claim 4, characterized in that the grate (7) is connected to a support (15), which prevents the grate on the sloping towards the door (2) ( 7) supports the food to be cooked against the door (2) in such a way that in the area where the grate (7) and door (2) meet, there is always a free gap through which the air in the oven chamber (4) can flow.
6. Kombinierter Mikrowellen-, Infrarot- und Konvektionsofen gemäss Anspruch 1, dadurch gekennzeichnet, dass er einen Einsatz enthält, der innerhalb des Ofenraumes (4) eines herkömmlichen Mikrowellenofens dreiseitig einen verkleinerten Garraum (4a) begrenzt und dessen rückwärtige Wand einerseits einen Durchgang (14) für Luft offenlässt, und andererseits einen ersten Luftkanal (11') begrenzt, durch den Luft aus dem Geräteteil (3) zu einer Luftaustrittεöffnung (12) strömen kan und einen zweiten Luftkanal (11) begrenzt, durch den Heissluf aus dem Garraum (4a) zu derselben Luftaustrittsöffnung (12) strömen kann, und dass er zwei sich im weεentlichen über die ganze Breite deε Einsatzes erstreckende Infrarotheizelemente (19, 20) trägt, von denen eines in vertikaler Richtung oberhalb und das andere unterhalb des Rostes (7) angeordnet ist.6. Combined microwave, infrared and convection oven according to claim 1, characterized in that it contains an insert which delimits a reduced cooking space (4a) on three sides within the oven space (4) of a conventional microwave oven and whose rear wall on the one hand has a passage (14 ) leaves open for air, and on the other hand delimits a first air duct (11 ') through which air can flow from the appliance part (3) to an air outlet opening (12) and delimits a second air duct (11) through which hot air from the cooking space (4a ) can flow to the same air outlet opening (12) and that it carries two infrared heating elements (19, 20), which essentially extend over the entire width of the insert, one of which is in the vertical direction above and the other below the grate (7) is arranged.
7. Kombinierter Mikrowellen-, Infrarot- und Konvektionsofen nach Anspruch 6, dadurch gekennzeichnet, dass der Einsatz aus Keramikplatten (16) besteht und die Heizelemente (8, 9) Halogenleuchten sind, von denen das untere Heizelement (9) in Bodennähe im Bereich der versetzten Wandteile (5, 6) am Uebergang vom Durchgang (14) in den Ofenraum (4) und das obere Heizelement (8) diagonal gegenüber in Deckennähe angeordnet ist .7. Combined microwave, infrared and convection oven according to claim 6, characterized in that the insert consists of ceramic plates (16) and the heating elements (8, 9) are halogen lamps, of which the lower heating element (9) near the floor in the area of staggered wall parts (5, 6) at the transition from the passage (14) into the furnace chamber (4) and the upper heating element (8) is arranged diagonally opposite near the ceiling.
8. Kombinierter Mikrowellen-, Infrarot- und Konvektionsofen nach Anspruch 1, dadurch gekennzeichnet, dass der Ofenraum (4) oben, hinten und unten durch einen Luftkanal (27), der durch innen liegende Glaskeramikplatten (24, 25, 26) und einen aussen liegenden Aussenmantel (23) gebildet ist, begrenzt wird, innerhalb von welchem Luftkanal (27) Infrarotstrahler (28) angeordnet sind.8. Combined microwave, infrared and convection oven according to claim 1, characterized in that the oven space (4) above, behind and below through an air channel (27) through the inner glass ceramic plates (24, 25, 26) and one outside lying outer jacket (23) is formed, within which air channel (27) infrared radiators (28) are arranged.
9. Kombinierter Mikrowellen-, Infrarot- und Konvektionsofen nach Anspruch 8, dadurch gekennzeichnet, dass zumindest in einzelnen Glaskeramikplatten (24, 26) je ein Metallgitter (34, 36) integriert ist, das die Infrarotstrahler (28) vor den Mikrowellen abschirmt und Mikrowellen-Durchtrittεkanäle (36) begrenzt.9. Combined microwave, infrared and convection oven according to claim 8, characterized in that at least in individual glass ceramic plates (24, 26) a metal grid (34, 36) is integrated, which shields the infrared radiators (28) from the microwaves and microwaves Passage channels (36) limited.
10. Kombinierter Mikrowellen-, Infrarot- und Konvektionsofen nach Anspruch 8, dadurch gekennzeichnet, dass der Luftstrom entweder mittels eines drehzahlregulierbaren Ventilators oder eines Ventilators (29) und einer Regelklappe (30) gesteuert wird. 10. Combined microwave, infrared and convection oven according to claim 8, characterized in that the air flow is controlled either by means of a speed-adjustable fan or a fan (29) and a control flap (30).
PCT/CH1990/000007 1989-01-12 1990-01-12 Combined microwave, infrared and convection oven WO1990008449A1 (en)

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CH8789 1989-01-12
CH87/89-7 1989-01-12

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Cited By (16)

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ES2036446A2 (en) * 1991-05-20 1993-05-16 Fagor S Coop Ltda Combined microwave oven with hidden grill
GB2279856A (en) * 1993-06-25 1995-01-11 Merrychef Ltd Microwave heating
EP0747638A1 (en) * 1995-06-09 1996-12-11 Samsung Electronics Co., Ltd. Convection microwave oven
EP0917401A2 (en) * 1997-11-15 1999-05-19 Lg Electronics Inc. A cooling apparatus for a microwave oven having additional heating lamps
EP0977467A2 (en) * 1998-07-29 2000-02-02 Lg Electronics Inc. Cooling device for halogen lamp in microvave ovens
EP1207721A2 (en) * 2000-11-10 2002-05-22 Lg Electronics Inc. Heater system for microwave oven
WO2002056640A2 (en) * 2001-01-11 2002-07-18 General Electric Company Thermal/convection oven including halogen lamps
DE19908180C2 (en) * 1998-02-27 2003-07-03 Sanyo Electric Co Heating cooking device with a heating part which is formed from a radiant heating element and an insulator
DE10203607A1 (en) * 2002-01-30 2003-07-31 Bsh Bosch Siemens Hausgeraete Light wave oven has cooling channels with inlet opening for cooling air, outlet opening for carrying away cooling air, which flows perpendicularly to rod lamp axis in channel
EP1334644A1 (en) * 2000-10-24 2003-08-13 TurboChef Technologies, Inc. Compact quick-cooking convectional oven
EP2016340A1 (en) * 2006-05-05 2009-01-21 Electrolux Home Products Corporation N.V. Cooking oven, especially household finishing oven
US8776675B1 (en) 2010-03-16 2014-07-15 Rom Meris Meat rotisserie and associated method
US20150020404A1 (en) * 2013-07-19 2015-01-22 Tae Hyung Kim Multifunctional microwave oven
US9874358B2 (en) 2015-05-05 2018-01-23 Appliance Innovation, Inc. Oven based on a combination of heated air and infrared heating element
US11009468B2 (en) 2011-08-31 2021-05-18 Goji Limited Object processing state sensing using RF radiation
US11639797B2 (en) 2015-05-05 2023-05-02 Ovention, Inc. Cooking oven having an active vent

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Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2036446A2 (en) * 1991-05-20 1993-05-16 Fagor S Coop Ltda Combined microwave oven with hidden grill
GB2279856A (en) * 1993-06-25 1995-01-11 Merrychef Ltd Microwave heating
US5483044A (en) * 1993-06-25 1996-01-09 Merrychef Limited Microwave heating with hot and cold air streams
GB2279856B (en) * 1993-06-25 1997-03-05 Merrychef Ltd Microwave Heating
EP0747638A1 (en) * 1995-06-09 1996-12-11 Samsung Electronics Co., Ltd. Convection microwave oven
EP0917401A2 (en) * 1997-11-15 1999-05-19 Lg Electronics Inc. A cooling apparatus for a microwave oven having additional heating lamps
EP0917401A3 (en) * 1997-11-15 2000-03-29 Lg Electronics Inc. A cooling apparatus for a microwave oven having additional heating lamps
DE19908180C2 (en) * 1998-02-27 2003-07-03 Sanyo Electric Co Heating cooking device with a heating part which is formed from a radiant heating element and an insulator
EP0977467A2 (en) * 1998-07-29 2000-02-02 Lg Electronics Inc. Cooling device for halogen lamp in microvave ovens
EP0977467A3 (en) * 1998-07-29 2000-03-29 Lg Electronics Inc. Cooling device for halogen lamp in microvave ovens
EP1334644A4 (en) * 2000-10-24 2008-07-23 Turbochef Tech Inc Compact quick-cooking convectional oven
EP1334644A1 (en) * 2000-10-24 2003-08-13 TurboChef Technologies, Inc. Compact quick-cooking convectional oven
EP1207721A2 (en) * 2000-11-10 2002-05-22 Lg Electronics Inc. Heater system for microwave oven
EP1207721A3 (en) * 2000-11-10 2005-07-27 Lg Electronics Inc. Heater system for microwave oven
EP1788849A2 (en) * 2000-11-10 2007-05-23 Lg Electronics Inc. Heater system for microwave oven
EP1788849A3 (en) * 2000-11-10 2007-09-19 Lg Electronics Inc. Heater system for microwave oven
WO2002056640A2 (en) * 2001-01-11 2002-07-18 General Electric Company Thermal/convection oven including halogen lamps
WO2002056640A3 (en) * 2001-01-11 2003-04-17 Gen Electric Thermal/convection oven including halogen lamps
DE10203607A1 (en) * 2002-01-30 2003-07-31 Bsh Bosch Siemens Hausgeraete Light wave oven has cooling channels with inlet opening for cooling air, outlet opening for carrying away cooling air, which flows perpendicularly to rod lamp axis in channel
EP2016340A1 (en) * 2006-05-05 2009-01-21 Electrolux Home Products Corporation N.V. Cooking oven, especially household finishing oven
US8776675B1 (en) 2010-03-16 2014-07-15 Rom Meris Meat rotisserie and associated method
US11009468B2 (en) 2011-08-31 2021-05-18 Goji Limited Object processing state sensing using RF radiation
US20150020404A1 (en) * 2013-07-19 2015-01-22 Tae Hyung Kim Multifunctional microwave oven
US9874358B2 (en) 2015-05-05 2018-01-23 Appliance Innovation, Inc. Oven based on a combination of heated air and infrared heating element
US11639797B2 (en) 2015-05-05 2023-05-02 Ovention, Inc. Cooking oven having an active vent

Also Published As

Publication number Publication date
EP0417214A1 (en) 1991-03-20
AU4805590A (en) 1990-08-13

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