EP1325668A1 - Microwave device - Google Patents

Microwave device

Info

Publication number
EP1325668A1
EP1325668A1 EP01974280A EP01974280A EP1325668A1 EP 1325668 A1 EP1325668 A1 EP 1325668A1 EP 01974280 A EP01974280 A EP 01974280A EP 01974280 A EP01974280 A EP 01974280A EP 1325668 A1 EP1325668 A1 EP 1325668A1
Authority
EP
European Patent Office
Prior art keywords
microwave
microwave device
source
grid
cooking space
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP01974280A
Other languages
German (de)
French (fr)
Other versions
EP1325668B1 (en
Inventor
Bernhard Herold
Katrin Horn
Kurt Lintner
Martin Schulte
Martin Thaler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BSH Hausgeraete GmbH
Original Assignee
BSH Bosch und Siemens Hausgeraete GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BSH Bosch und Siemens Hausgeraete GmbH filed Critical BSH Bosch und Siemens Hausgeraete GmbH
Publication of EP1325668A1 publication Critical patent/EP1325668A1/en
Application granted granted Critical
Publication of EP1325668B1 publication Critical patent/EP1325668B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • H05B6/76—Prevention of microwave leakage, e.g. door sealings
    • H05B6/766—Microwave radiation screens for windows
    • 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
    • H05B6/6426—Aspects relating to the exterior of the microwave heating apparatus, e.g. metal casing, power cord
    • 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

Definitions

  • the invention is based on a microwave device according to the preamble of claim 1.
  • a generic microwave device is known from EP 1005 255 A1.
  • the microwave oven has a cooking space arranged in a housing, a microwave source and a halogen lamp.
  • the halogen lamp can be used as a heating element.
  • a perforated grid made of an electrically conductive material is arranged in front of the halogen lamp.
  • the perforated grid is formed by a sheet metal plate into which recesses are made.
  • the object of the invention is to further develop a generic microwave device, in particular with regard to its efficiency.
  • the object is achieved by the features of patent claim 1, while advantageous refinements and developments of the invention can be found in the subclaims. *: ' * '
  • the invention is based on a microwave device with a cooking space arranged in a housing, with at least one microwave source and with at least one further radiation source that is alternative to the microwave source and is protected from microwaves of the microwave source by means of a screening grid.
  • the latching walls of the shielding grid each have a radiation reflector, via which rays from the alternative radiation source can be reflected into the cooking space.
  • a radiation reflector via which rays from the alternative radiation source can be reflected into the cooking space.
  • light sources with a glow element require shielding, specifically in order to protect the glow element from damage and to at least largely avoid leakage of microwaves via the glow element and via supply lines of the glow element.
  • uniform illumination of the cooking space can be achieved with the screening grid according to the invention.
  • the light source can emit purely visible light for illuminating the cooking space or can advantageously also be designed to be usable as a heating element, for example by emitting light in the infrared range, as is the case in particular with halogen lamps.
  • the screening grid according to the invention an advantageous heating efficiency of the light source can be achieved.
  • the reflector can be formed by a flat surface that is perpendicular to a support surface in the cooking space.
  • one or more reflectors can advantageously be inclined to the cooking space and / or curved, so that advantageous reflection of the rays into the cooking space is ensured.
  • At least one and advantageously all the latching walls are formed by a thin-walled, polished metal, as a result of which an inexpensive shielding grid with preferably small wall thicknesses can be achieved.
  • a highly reflective material such as, for example, aluminum, silver, etc., as a result of which particularly high reflection rates and low absorption values can be achieved.
  • the shielding grid can have snap-in recesses with different types of base areas that appear useful to the person skilled in the art, for example with round, oval or square base areas.
  • the screening grid has locking recesses with rectangular bases, which makes the screening grid simple and can be designed and manufactured cost-effectively, for example by means of assembled, flat metal sheets, etc.
  • the shielding grid In order to achieve the most advantageous shielding or attenuation of the microwaves, the shielding grid must be dimensioned in such a way that a propagation of the microwaves over the shielding grid is at least largely avoided. This is advantageously achieved in the case of rectangular snap-in recesses by designing them with a length of less than half a microwave length. Furthermore, the width of the locking recess is advantageously equal to half the length of the locking recess. Locking recesses with round, oval, triangular or pentagonal base areas etc. are to be designed accordingly in accordance with generally known laws, so that a spread of the microwaves through the shielding grid is at least largely avoided.
  • the height should advantageously be selected in such a way that at least an attenuation of 40 dB is achieved, the logarithmic ratio of 40 dB being based on the microwave power in front of the shielding grid and one present microwave power according to the screening grid, on the side facing the radiation source.
  • the screening grid is advantageously between 5 mm and 50 mm high.
  • Fig. 1 shows a microwave device without a housing obliquely from above
  • Fig. 2 shows a detail II of Fig. 1 enlarged
  • Fig. 3 shows a partial section along the line III-III in Fig. 1 and Fig. 4 attenuation of microwaves, depending on the height and the recess length of various screening grids according to the invention.
  • the microwave device has a microwave source 12 formed by a magnetron or a time-of-flight tube, from which microwaves can be conducted into the cooking chamber 11 via a waveguide 22 for heating a food to be cooked.
  • the microwave device has two radiation sources 13, 14 formed by halogen lamps.
  • the first radiation source 13 is arranged above the glass pane 20 forming the ceiling of the cooking space 11 and the second radiation source 14 is arranged below and extends below the glass plate 21 forming the bottom of the cooking space 11 across the entire width of the cooking space 11.
  • the halogen lamps forming the radiation sources 13, 14 each have an incandescent filament by means of which invisible light in the infrared range for heating a food item and visible light for illuminating the cooking space 11 can be generated.
  • the halogen lamps on the side facing away from the cooking chamber 11 are surrounded by bowl-shaped reflectors 23, 24. During the operation of the microwave device with the halogen lamps, these are moved in opposite directions above and below the cooking chamber 11 to the front and to the rear via a drive unit (not shown).
  • the radiation sources 13, 14 are protected from the microwaves of the microwave source 12 via screening grids 15, 16.
  • the first shielding grid 15 is arranged above the glass pane 20 forming the ceiling of the cooking space 11, between the glass pane 20 and the first, upper radiation source 13 and extends over the entire cooking space 11.
  • the second shielding grid 16 is below that forming the bottom of the cooking space 11 Glass pane 21, arranged between the glass pane 21 and the second, lower radiation source 14 and also extends over the entire cooking space 11.
  • the latching walls 17 are formed from thin-walled, polished, flat aluminum sheets aligned perpendicular to the floor or ceiling of the cooking chamber 11, so that the latching walls 17 form radiation reflectors 18, via which rays from the radiation sources 13, 14 can be reflected into the cooking chamber 11.
  • the aluminum sheets are put together and have a thickness of 0.2 mm.
  • other strengths that appear to be useful to the person skilled in the art are also conceivable, such as, for example, between 0.1 mm and 5 mm, the thinner the walls, the less rays from the radiation sources are reflected on the end faces of the walls in undesired directions.
  • the shielding rasters 15, 16 have locking recesses 19 with rectangular bases, which have a length I of less than half a microwave length. With an existing microwave frequency of 2.45 GHz, the length I should therefore be less than 61.25 mm.
  • the length I of the base area is 20 mm and the width b of the base area is equal to half the length I and thus 10 mm (FIGS. 1 and 2).
  • the screening grids 15, 16 are designed with a height h of 40 mm.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Constitution Of High-Frequency Heating (AREA)
  • Electric Ovens (AREA)
  • Seal Device For Vehicle (AREA)
  • Electric Stoves And Ranges (AREA)

Abstract

Grid walls (17) of the screening grid (15, 16) have a radiation reflector (18). Radiation from the alternative source (13, 14) is reflected by it, into the oven chamber.

Description

Mikrowellengerat Mikrowellengerat
Die Erfindung geht aus von einem Mikrowellengerät nach dem Oberbegriff des Anspruchs 1.The invention is based on a microwave device according to the preamble of claim 1.
Aus der EP 1005 255 A1 ist ein gattungsbildendes Mikrowellengerät bekannt. Das Mikrowellengerät besitzt ein in einem Gehäuse angeordneten Garraum, eine Mikrowellenquelle und eine Halogenlampe. Die Halogenlampe ist als Heizelement nutzbar. Um die Halogenlampe vor Mikrowellen der Mikrowellenquelle zu schützen, und zwar insbesondere eine Glühwendel der Halogenlampe, und um eine Leckrate über Stromversorgungsleitungen der Halogenlampe unter bestimmten Grenzwerten zu halten, ist vor der Halogenlampe ein Lochgitter aus einem elektrisch leitenden Material angeordnet. Das Lochgitter wird von einer Blechplatte gebildet, in die Ausnehmungen eingebracht sind.A generic microwave device is known from EP 1005 255 A1. The microwave oven has a cooking space arranged in a housing, a microwave source and a halogen lamp. The halogen lamp can be used as a heating element. In order to protect the halogen lamp from microwaves of the microwave source, in particular an incandescent filament of the halogen lamp, and to keep a leak rate via power supply lines of the halogen lamp below certain limit values, a perforated grid made of an electrically conductive material is arranged in front of the halogen lamp. The perforated grid is formed by a sheet metal plate into which recesses are made.
Die Aufgabe der Erfindung besteht darin, ein gattungsgemäßes Mikrowellengerät weiter- zuentwickeln, und zwar insbesondere hinsichtlich seines Wirkungsgrads. Die Aufgabe wird erfindungsgemäß durch die Merkmale des Patentanspruchs 1 gelöst, während vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung den Unteransprüchen entnommen werden können. *: '*' The object of the invention is to further develop a generic microwave device, in particular with regard to its efficiency. The object is achieved by the features of patent claim 1, while advantageous refinements and developments of the invention can be found in the subclaims. *: ' * '
Die Erfindung geht aus von einem Mikrowellengerät mit einem in einem Gehäuse angeordneten Garraum, mit zumindest einer Mikrowellenquelle und mit zumindest einer weiteren, zur Mikrowellenquelle alternativen Strahlungsquelle, die über ein Abschirmraster vor Mikrowellen der Mikrowellenquelle geschützt ist.The invention is based on a microwave device with a cooking space arranged in a housing, with at least one microwave source and with at least one further radiation source that is alternative to the microwave source and is protected from microwaves of the microwave source by means of a screening grid.
Es wird vorgeschlagen, daß zumindest eine und vorteilhaft sämtliche Rastwandungen des Abschirmrasters jeweils einen Strahlungsreflektor aufweisen, über die Strahlen der alternativen Strahlungsquelle in den Garraum reflektierbar sind. Bei einer vorteilhaften Abschirmung der Strahlungsquelle vor Mikrowellen kann gleichzeitig eine Absorption der Strahlen der alternativen Strahlungsquelle zumindest weitgehend vermieden und der Wirkungsgrad gesteigert werden. Die erfindungsgemäße Lösung kann bei verschiedenen, dem Fachmann als sinnvoll erscheinenden Strahlungsquellen eingesetzt werden, beispielsweise bei Strahlungsquellen, die eine reine Wärmestrahlung aussenden usw. Besonders vorteilhaft wird jedoch die erfindungsgemäße Lösung bei von Lichtquellen gebildeten Strahlungsquellen eingesetzt, die ein Glühelement aufweisen. Insbesondere Lichtquellen mit einem Glühelement erfor- dem eine Abschirmung, und zwar um das Glühelement vor einer Beschädigung zu schützen und um eine Leckage von Mikrowellen über das Glühelement und über Versorgungsleitungen des Glühelements zumindest weitgehend zu vermeiden. Ferner kann mit dem erfindungsgemäßen Abschirmraster ein gleichmäßiges Ausleuchten des Garraums erreicht werden. Die Lichtquelle kann rein sichtbares Licht zur Beleuchtung des Garraums ausstrahlen oder kann vorteilhaft zusätzlich als Heizelement nutzbar ausgeführt sein, und zwar indem diese beispielsweise Licht im Infrarotbereich aussendet, wie dies insbesondere bei Halogenlampen der Fall ist. Mit dem erfindungsgemäßen Abschirmraster kann ein vorteilhafter Heizwirkungsgrad der Lichtquelle erreicht werden.It is proposed that at least one and advantageously all of the latching walls of the shielding grid each have a radiation reflector, via which rays from the alternative radiation source can be reflected into the cooking space. With an advantageous shielding of the radiation source from microwaves, absorption of the rays from the alternative radiation source can at least be largely avoided and the efficiency increased. The solution according to the invention can be used with various radiation sources which appear sensible to a person skilled in the art, for example with radiation sources which emit pure heat radiation etc. However, the solution according to the invention is used particularly advantageously with radiation sources formed by light sources which have a glow element. In particular, light sources with a glow element require shielding, specifically in order to protect the glow element from damage and to at least largely avoid leakage of microwaves via the glow element and via supply lines of the glow element. Furthermore, uniform illumination of the cooking space can be achieved with the screening grid according to the invention. The light source can emit purely visible light for illuminating the cooking space or can advantageously also be designed to be usable as a heating element, for example by emitting light in the infrared range, as is the case in particular with halogen lamps. With the screening grid according to the invention, an advantageous heating efficiency of the light source can be achieved.
Der Reflektor kann von einer ebenen, zu einer Auflagefläche im Garraum senkrecht ausgebildeten Fläche gebildet sein. Um jedoch möglicherweise auftretende Mehrfachreflexionen und damit verbundene Verluste zu vermeiden, können vorteilhaft ein oder mehrere Reflektoren zum Garraum geneigt und/oder in sich gekrümmt ausgeführt sein, so daß eine vorteilhafte Reflexion der Strahlen in den Garraum gewährleistet ist.The reflector can be formed by a flat surface that is perpendicular to a support surface in the cooking space. However, in order to avoid possible multiple reflections and the associated losses, one or more reflectors can advantageously be inclined to the cooking space and / or curved, so that advantageous reflection of the rays into the cooking space is ensured.
In einer weiteren Ausgestaltung der Erfindung wird vorgeschlagen, daß zumindest eine und vorteilhaft sämtliche Rastwandungen von einem dünnwandigen, polierten Metall gebildet sind, wodurch ein kostengünstiges Abschirmraster mit vorzugsweise kleinen Wandstärken erreicht werden kann. Daneben ist jedoch auch möglich, Wandungen mit einem hochreflektierenden Material zu beschichten, wie beispielsweise mit Aluminium, Silber usw., wodurch besonders hohe Reflexionsraten und geringe Absorptionswerte erreicht werden können.In a further embodiment of the invention it is proposed that at least one and advantageously all the latching walls are formed by a thin-walled, polished metal, as a result of which an inexpensive shielding grid with preferably small wall thicknesses can be achieved. In addition, however, it is also possible to coat walls with a highly reflective material, such as, for example, aluminum, silver, etc., as a result of which particularly high reflection rates and low absorption values can be achieved.
Das Abschirmraster kann Rastausnehmungen mit verschiedenartigen, dem Fachmann als sinnvoll erscheinenden Grundflächen aufweisen, beispielsweise mit runden, ovalen oder eckigen Grundflächen. Besonders vorteilhaft besitzt das Abschirmraster jedoch Rastausnehmungen mit rechteckigen Grundflächen, wodurch das Abschirmraster einfach und kostengünstig ausgelegt und hergestellt werden kann, beispielsweise durch zusammengesteckte, ebene Metallbleche usw.The shielding grid can have snap-in recesses with different types of base areas that appear useful to the person skilled in the art, for example with round, oval or square base areas. Particularly advantageously, the screening grid has locking recesses with rectangular bases, which makes the screening grid simple and can be designed and manufactured cost-effectively, for example by means of assembled, flat metal sheets, etc.
Um eine möglichst vorteilhafte Abschirmung bzw. Dämpfung der Mikrowellen zu erreichen, ist das Abschirmraster derart zu dimensionieren, daß eine Ausbreitung der Mikro- wellen über das Abschirmraster zumindest weitgehend vermieden wird. Dies wird bei rechteckigen Rastausnehmungen vorteilhaft erreicht, indem diese mit einer Länge kleiner als eine halbe Mikrowellenlänge ausgeführt werden. Ferner ist vorteilhaft die Breite der Rastausnehmung gleich der halben Länge der Rastausneh ung ausgeführt. Rastausnehmungen mit runden, ovalen, dreieckigen oder fünfeckigen Grundflächen usw. sind nach allgemein bekannten Gesetzmäßigkeiten entsprechend auszulegen, so daß eine Ausbreitung der Mikrowellen durch das Abschirmraster zumindest weitgehend vermieden wird.In order to achieve the most advantageous shielding or attenuation of the microwaves, the shielding grid must be dimensioned in such a way that a propagation of the microwaves over the shielding grid is at least largely avoided. This is advantageously achieved in the case of rectangular snap-in recesses by designing them with a length of less than half a microwave length. Furthermore, the width of the locking recess is advantageously equal to half the length of the locking recess. Locking recesses with round, oval, triangular or pentagonal base areas etc. are to be designed accordingly in accordance with generally known laws, so that a spread of the microwaves through the shielding grid is at least largely avoided.
Abhängig von einer Höhe des Abschirmrasters ergeben sich unterschiedliche Dämpfun- gen. Die Höhe sollte vorteilhaft in der Weise ausgewählt werden, daß zumindest eine Dämpfung von 40 dB erreicht wird, wobei sich die logarithmierte Verhältnisgröße von 40 dB aus einer vorliegenden Mikrowellenleistung vor dem Abschirmraster und einer vorliegenden Mikrowellenleistung nach dem Abschirmraster, auf der der Strahlungsquelle zugewandten Seite ergibt. Bei gängigen Mikrowellenfrequenzen und insbesondere bei einer Frequenz von 2,45 GHz ist das Abschirmraster vorteilhaft zwischen 5 mm und 50 mm hoch ausgeführt.Depending on the height of the shielding grid, there are different attenuations. The height should advantageously be selected in such a way that at least an attenuation of 40 dB is achieved, the logarithmic ratio of 40 dB being based on the microwave power in front of the shielding grid and one present microwave power according to the screening grid, on the side facing the radiation source. At common microwave frequencies and in particular at a frequency of 2.45 GHz, the screening grid is advantageously between 5 mm and 50 mm high.
Weitere Vorteile ergeben sich aus der folgenden Zeichnungsbeschreibung. In der Zeichnung ist ein Ausführungsbeispiel der Erfindung dargestellt. Die Zeichnung, die Beschrei- bung und die Ansprüche enthalten zahlreiche Merkmale in Kombination. Der Fachmann wird die Merkmale zweckmäßigerweise auch einzeln betrachten und zu sinnvollen weiteren Kombinationen zusammenfassen.Further advantages result from the following description of the drawing. In the drawing, an embodiment of the invention is shown. The drawing, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into useful further combinations.
Es zeigen:Show it:
Fig. 1 ein Mikrowellengerät ohne Gehäuse schräg von oben, Fig. 2 einen Ausschnitt II aus Fig. 1 vergrößert dargestellt, Fig. 3 einen Teilschnitt entlang der Linie lll-lll in Fig. 1 und Fig. 4 Dämpfungen von Mikrowellen, abhängig von der Höhe und der Rastausnehmungslänge verschiedener erfindungsgemäßer Abschirmraster.Fig. 1 shows a microwave device without a housing obliquely from above, Fig. 2 shows a detail II of Fig. 1 enlarged, Fig. 3 shows a partial section along the line III-III in Fig. 1 and Fig. 4 attenuation of microwaves, depending on the height and the recess length of various screening grids according to the invention.
Fig. 1 und 3 zeigt ein Mikrowellengerät mit einem in einem Gehäuse 10 angeordneten Garraum 11, dessen Seitenwände von Blechwänden 25 und dessen Decke und Boden von Glasscheiben 20, 21 gebildet sind und der über eine nicht näher dargestellte Tür an seiner Vorderseite verschließbar ist. Ferner besitzt das Mikrowellengerät eine von einem Magnetron bzw. einer Laufzeitröhre gebildete Mikrowellenquelle 12, von der aus über einen Wellenleiter 22 Mikrowellen in den Garraum 11 zur Erwärmung eines Garguts leitbar sind. Neben der Mikrowellenquelle 12 besitzt das Mikrowellengerät zwei von Halogenlampen gebildete Strahlungsquellen 13, 14. Die erste Strahlungsquelle 13 ist oberhalb der die Decke des Garraums 11 bildenden Glasscheibe 20 und die zweite Strahlungsquelle 14 ist unterhalb der den Boden des Garraums 11 bildenden Glasscheibe 21 angeordnet und erstrecken sich quer über die gesamte Breite des Garraums 11. Die die Strahlungsquellen 13, 14 bildenden Halogenlampen besitzen jeweils eine Glühwendel, über die unsichtbares Licht im Infrarotbereich zur Erwärmung eines Garguts und sichtbares Licht zur Beleuchtung des Garraums 11 erzeugbar ist. Um in die vom Garraum 11 abgewandte Richtung strahlendes Licht in den Garraum 11 umzulenken, sind die Halogenlampen auf der vom Garraum 11 abgewandten Seite von schalenförmigen Reflektoren 23, 24 umgeben. Während des Betriebs des Mikrowellengeräts mit den Halogenlampen werden diese über eine nicht näher dargestellte Antriebseinheit oberhalb bzw. unterhalb des Garraums 11 gegenläufig nach vorn und nach hinten bewegt.1 and 3 show a microwave device with a cooking space 11 arranged in a housing 10, the side walls of which are formed by sheet metal walls 25 and the top and bottom of which are formed by glass panes 20, 21 and which can be closed at the front via a door (not shown). Furthermore, the microwave device has a microwave source 12 formed by a magnetron or a time-of-flight tube, from which microwaves can be conducted into the cooking chamber 11 via a waveguide 22 for heating a food to be cooked. In addition to the microwave source 12, the microwave device has two radiation sources 13, 14 formed by halogen lamps. The first radiation source 13 is arranged above the glass pane 20 forming the ceiling of the cooking space 11 and the second radiation source 14 is arranged below and extends below the glass plate 21 forming the bottom of the cooking space 11 across the entire width of the cooking space 11. The halogen lamps forming the radiation sources 13, 14 each have an incandescent filament by means of which invisible light in the infrared range for heating a food item and visible light for illuminating the cooking space 11 can be generated. In order to redirect light radiating into the cooking chamber 11 in the direction facing away from the cooking chamber 11, the halogen lamps on the side facing away from the cooking chamber 11 are surrounded by bowl-shaped reflectors 23, 24. During the operation of the microwave device with the halogen lamps, these are moved in opposite directions above and below the cooking chamber 11 to the front and to the rear via a drive unit (not shown).
Die Strahlungsquellen 13, 14 sind über Abschirmraster 15, 16 vor den Mikrowellen der Mikrowellenquelle 12 geschützt. Das erste Abschirmraster 15 ist oberhalb der die Decke des Garraums 11 bildenden Glasscheibe 20, zwischen der Glasscheibe 20 und der ersten, oberen Strahlungsquelle 13 angeordnet und erstreckt sich über den gesamten Garraum 11. Das zweite Abschirmraster 16 ist unterhalb der den Boden des Garraums 11 bildenden Glasscheibe 21 , zwischen der Glasscheibe 21 und der zweiten, unteren Strahlungsquelle 14 angeordnet und erstreckt sich ebenfalls über den gesamten Garraum 11. Erfindungsgemäß sind die Rastwandungen 17 von dünnwandigen, polierten und senkrecht zum Boden bzw. zur Decke des Garraums 11 ausgerichteten, ebenen Aluminiumblechen gebildet, so daß die Rastwandungen 17 Strahlungsreflektoren 18 bilden, über die Strahlen der Strahlungsquellen 13, 14 in den Garraum 11 reflektierbar sind. Die Aluminiumbleche sind zusammengesteckt und besitzen eine Stärke von 0,2 mm. Grundsätzlich sind auch andere, dem Fachmann als sinnvoll erscheinende Stärken denkbar, wie beispielsweise zwischen 0,1 mm und 5 mm, wobei je dünner die Wandungen sind, desto weniger werden Strahlen der Strahlungsquellen an Stirnseiten der Wandungen in ungewünschte Richtungen reflektiert. Die Abschirmraster 15, 16 besitzen Rastausnehmungen 19 mit rechteckigen Grundflächen, die eine Länge I von kleiner als eine halbe Mikrowel- lenlänge aufweisen. Bei einer vorliegenden Mikrowellenfrequenz von 2,45 GHz sollte die Länge I daher kleiner als 61 ,25 mm ausgeführt sein. Im dargestellten Ausführungsbeispiel ist die Länge I der Grundfläche 20 mm und die Breite b der Grundfläche ist gleich der halben Länge I und damit 10 mm (Fig. 1 und 2).The radiation sources 13, 14 are protected from the microwaves of the microwave source 12 via screening grids 15, 16. The first shielding grid 15 is arranged above the glass pane 20 forming the ceiling of the cooking space 11, between the glass pane 20 and the first, upper radiation source 13 and extends over the entire cooking space 11. The second shielding grid 16 is below that forming the bottom of the cooking space 11 Glass pane 21, arranged between the glass pane 21 and the second, lower radiation source 14 and also extends over the entire cooking space 11. According to the invention, the latching walls 17 are formed from thin-walled, polished, flat aluminum sheets aligned perpendicular to the floor or ceiling of the cooking chamber 11, so that the latching walls 17 form radiation reflectors 18, via which rays from the radiation sources 13, 14 can be reflected into the cooking chamber 11. The aluminum sheets are put together and have a thickness of 0.2 mm. In principle, other strengths that appear to be useful to the person skilled in the art are also conceivable, such as, for example, between 0.1 mm and 5 mm, the thinner the walls, the less rays from the radiation sources are reflected on the end faces of the walls in undesired directions. The shielding rasters 15, 16 have locking recesses 19 with rectangular bases, which have a length I of less than half a microwave length. With an existing microwave frequency of 2.45 GHz, the length I should therefore be less than 61.25 mm. In the exemplary embodiment shown, the length I of the base area is 20 mm and the width b of the base area is equal to half the length I and thus 10 mm (FIGS. 1 and 2).
Abhängig von der Höhe h des Abschirmrasters 15, 16 ergeben sich unterschiedliche Dämpfungen D, wie dies in Fig. 4 bei einer Mikrowellenfrequenz von 2,45 GHz dargestellt ist. Vorzugsweise sollte eine Dämpfung D von größer/gleich 40 dB erreicht werden. Bei dem dargestellten Ausführungsbeispiel sind die Abschirmraster 15, 16 mit einer Höhe h von 40 mm ausgeführt. Depending on the height h of the screening grid 15, 16, different attenuations D result, as is shown in FIG. 4 at a microwave frequency of 2.45 GHz. An attenuation D of greater than or equal to 40 dB should preferably be achieved. In the illustrated embodiment, the screening grids 15, 16 are designed with a height h of 40 mm.
Bezugszeichenreference numeral
Gehäuse I Länge Garraum b Breite Mikrowellenquelle h Höhe Strahlungsquelle D Dämpfung Strahlungsquelle Abschirmraster Abschirmraster Rastwandung Strahlungsreflektor Rastausnehmung Glasscheibe Glasscheibe Wellenleiter Reflektor Reflektor Blechwand Housing I Length of cooking space b Width of microwave source h Height of radiation source D Attenuation of radiation source Shielding grid Shielding grid Locking wall Radiation reflector Locking recess Glass pane Glass pane Waveguide Reflector Reflector Sheet metal wall

Claims

Patentansprüche claims
1. Mikrowellengerät mit einem in einem Gehäuse (10) angeordneten Garraum (11), mit zumindest einer Mikrowellenquelle (12) und mit zumindest einer weiteren, zur Mikrowellenquelle (12) alternativen Strahlungsquelle (13, 14), die über ein Abschirmraster (15, 16) vor Mikrowellen der Mikrowellenquelle (12) geschützt ist, dadurch gekennzeichnet, daß zumindest eine Rastwandung (17) des Abschirmrasters (15, 16) einen Strahlungsreflektor (18) aufweist, über den Strahlen der alternativen Strahlungsquelle (13, 14) in den Garraum (11) reflektierbar sind.1. Microwave device with a cooking chamber (11) arranged in a housing (10), with at least one microwave source (12) and with at least one further radiation source (13, 14) that is alternative to the microwave source (12) and that is provided with a screening grid (15, 16) is protected from microwaves of the microwave source (12), characterized in that at least one latching wall (17) of the screening grid (15, 16) has a radiation reflector (18) above the rays of the alternative radiation source (13, 14) into the cooking space (11) are reflectable.
2. Mikrowellengerät nach Anspruch 1 , dadurch gekennzeichnet, daß die alternative Strahlungsquelle (13, 14) von einer Lichtquelle mit einem Glühelement gebildet ist.2. Microwave device according to claim 1, characterized in that the alternative radiation source (13, 14) is formed by a light source with a glow element.
3. Mikrowellengerät nach Anspruch 2, dadurch gekennzeichnet, daß die von einer3. Microwave device according to claim 2, characterized in that the one
Lichtquelle gebildete alternative Strahlungsquelle (13, 14) als Heizelement nutzbar ist.Alternative radiation source (13, 14) formed as a heating element can be used.
4. Mikrowellengerät nach einem der vorhergehenden Ansprüche, dadurch ge- kennzeichnet, daß zumindest ein Reflektor zum Garraum geneigt ist.4. Microwave device according to one of the preceding claims, characterized in that at least one reflector is inclined to the cooking space.
5. Mikrowellengerät nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß zumindest eine Rastwandung (17) von einem dünnwandigen, polierten Metall gebildet ist.5. Microwave device according to one of the preceding claims, characterized in that at least one latching wall (17) is formed from a thin-walled, polished metal.
6. Mikrowellengerät nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das Abschirmraster (15, 16) Rastausnehmungen (19) mit rechteckigen Grundflächen aufweist.6. Microwave device according to one of the preceding claims, characterized in that the screening grid (15, 16) has locking recesses (19) with rectangular bases.
7. Mikrowellengerät nach Anspruch 6, dadurch gekennzeichnet, daß die Länge (I) der Rastausnehmung (19) kleiner als eine halbe Mikrowellenlänge ist. 7. Microwave device according to claim 6, characterized in that the length (I) of the latching recess (19) is less than half a microwave length.
8. Mikrowellengerät nach Anspruch 7, dadurch gekennzeichnet, daß die Breite (b) der Rastausnehmung (19) gleich der halben Länge (I) der Rastausnehmung (19) ist.8. A microwave oven according to claim 7, characterized in that the width (b) of the locking recess (19) is equal to half the length (I) of the locking recess (19).
9. Mikrowellengerät nach einem der vorhergehenden Ansprüche, dadurch ge- kennzeichnet, daß das Abschirmraster (15, 16) eine Höhe (h) zwischen 5 mm und 50 mm aufweist. 9. Microwave device according to one of the preceding claims, characterized in that the screening grid (15, 16) has a height (h) of between 5 mm and 50 mm.
EP01974280A 2000-09-28 2001-09-21 Microwave device Expired - Lifetime EP1325668B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10048158A DE10048158A1 (en) 2000-09-28 2000-09-28 Microwave oven with microwave source and screened IR radiant, has microwave screening grid reflecting IR into oven.
DE10048158 2000-09-28
PCT/EP2001/010959 WO2002028145A1 (en) 2000-09-28 2001-09-21 Microwave device

Publications (2)

Publication Number Publication Date
EP1325668A1 true EP1325668A1 (en) 2003-07-09
EP1325668B1 EP1325668B1 (en) 2007-01-17

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EP01974280A Expired - Lifetime EP1325668B1 (en) 2000-09-28 2001-09-21 Microwave device

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US (1) US6900422B2 (en)
EP (1) EP1325668B1 (en)
AT (1) ATE352181T1 (en)
AU (1) AU2001293832A1 (en)
DE (2) DE10048158A1 (en)
WO (1) WO2002028145A1 (en)

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WO2023172503A1 (en) * 2022-03-08 2023-09-14 Revolution Cooking, Llc Microwave oven with radiant energy heating element

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Also Published As

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US6900422B2 (en) 2005-05-31
ATE352181T1 (en) 2007-02-15
EP1325668B1 (en) 2007-01-17
DE50111909D1 (en) 2007-03-08
WO2002028145A1 (en) 2002-04-04
AU2001293832A1 (en) 2002-04-08
DE10048158A1 (en) 2002-04-11
US20040020920A1 (en) 2004-02-05

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