EP0482601B1 - Microwaves supply in microwave baking ovens - Google Patents

Microwaves supply in microwave baking ovens Download PDF

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Publication number
EP0482601B1
EP0482601B1 EP91118056A EP91118056A EP0482601B1 EP 0482601 B1 EP0482601 B1 EP 0482601B1 EP 91118056 A EP91118056 A EP 91118056A EP 91118056 A EP91118056 A EP 91118056A EP 0482601 B1 EP0482601 B1 EP 0482601B1
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EP
European Patent Office
Prior art keywords
microwave
household appliance
appliance according
reflector trough
waveguide
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP91118056A
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German (de)
French (fr)
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EP0482601A1 (en
Inventor
Armin Dipl.-Ing. Zibold
Rudolf Begero
Franz Rothmaier
Walter Gramlich
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.)
BOSCH-SIEMENS HAUSGERAETE GMBH
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Individual
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    • 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
    • H05B6/74—Mode transformers or mode stirrers

Definitions

  • the patent application relates to a microwave household appliance, in particular to a radiator unit for a microwave oven, with the features specified in the preamble of claim 1 (see DE-C-37 20 719).
  • a microwave oven with a rotating antenna has become known, the antenna arm of which is a segment of a circular area with an opening angle that is between 1/3 Pi and Pi.
  • the circular surface segment has projections on the lateral boundaries, the width of which is approximately 1/6 of the wavelength of the microwaves.
  • DE-33 26 514 has proposed a microwave oven with a rotating antenna, the antenna arm of which is asymmetrical. This is intended to solve the problem of improving the uniformity of the microwave radiation and achieving a uniform heating of the food in the cooking space.
  • a further improvement of microwave ovens equipped with rotary antennas has become known from DE 37 20 719.
  • microwave-specific discontinuities are arranged.
  • the invention is therefore based on the object of using a special radiator unit to bring about a further improvement in the energy density distribution in the cooking space and thus to improve the cooking results by means of more uniform energy distributions.
  • the arrangement according to the invention for solving this problem is characterized in that a reflector trough arranged outside the oven top surface is connected to the waveguide and the cooking space top surface, and that the microwave coupling pin protruding into the reflector trough and connected to the field stirrer is connected at a passage point between the waveguide and the reflector trough is surrounded by at least two microwave-specific discontinuities, which are formed by screw connections and material thickening, that the field stirrer is a spiral, the total length of which is much greater than its thickness, and that the cover limits the reflector trough on the cooking space side.
  • An advantageous embodiment of the invention consists in that the microwave-specific discontinuities ⁇ / 8 are long screw connections which mechanically connect the waveguide to the reflector trough at the same time. Such discontinuities represent blind elements from a microwave point of view and model the current density coating on the antenna arm, with the same effect on a field stirrer element.
  • the rotary antenna or the field stirrer detects microwave-specific discontinuities as often as possible and thus part of the current density coating on the respective surface of the antenna or the field stirrer is constantly acted on by additional blind elements.
  • the geometric design of the antenna arm configuration or the field stirrer also causes different current density coatings, which also result in a more even energy distribution in the cooking space.
  • the field stirrer spiral 8 which is set in rotation by the stirrer drive 1, is firmly connected to the microwave decoupling pin 5, within the reflector trough 7
  • Reflector trough 7 is arranged outside the oven top surface and is connected to the waveguide 4 and the oven top surface 10 via screw connections.
  • the overall structural arrangement of waveguide 4 and the system of the field stirrer is thus centered on the waveguide leadthrough in the middle of the cooking space.
  • the waveguide screw connections 6 represent microwave-specific discontinuities of the length ⁇ / 8 of the microwaves. However, it is also conceivable that the microwave-specific discontinuities are designed as ⁇ / 8 long weld thickenings.
  • the reflector trough 7 will preferably have a circular cross section with a radius of approximately ⁇ / 2 of the microwave wavelength. A rectangular design of the reflector trough 7 is also possible.
  • the waveguide through opening 11 from the waveguide 4 to the reflector trough 7 has at least a diameter of ⁇ / 4 of the microwave wavelength.
  • the reflector trough 7 is provided with a cover 9 which consists of materials which are permeable to microwaves and have low dielectric losses.
  • the material borosilicate glass is preferably used for the cover 9, but plastics with low E r can also be used.
  • the field stirrer is designed as a stirrer spiral 8, the top view of which can be seen in FIG. 2.
  • this embodiment results in a good energy density distribution in the cooking space.
  • the total length of the stirrer spiral is much larger than the thickness.
  • materials are preferably used that are very corrosion-resistant and have good long-term constancy of electrical properties, for example chrome-nickel alloys.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Constitution Of High-Frequency Heating (AREA)

Description

Die Patentanmeldung bezieht sich auf ein Mikrowellen-Haushaltgerät, insbesondere auf eine Strahlereinheit für einen Mikrowellenofen, mit den im Oberbegriff des Patentanspruches 1 angegebenen Merkmalen (siehe DE-C-37 20 719).The patent application relates to a microwave household appliance, in particular to a radiator unit for a microwave oven, with the features specified in the preamble of claim 1 (see DE-C-37 20 719).

Durch die DE 33 31 432 ist ein Mikrowellenofen mit einer rotierenden Antenne bekannt geworden, deren Antennenarm ein Kreisflächensegment ist mit einem Öffnungswinkel, der zwischen 1/3 Pi und Pi liegt. Das Kreisflächensegment besitzt an den seitlichen Begrenzungen Vorsprünge, deren Breite etwa 1/6 der Wellenlänge der Mikrowellen beträgt.From DE 33 31 432 a microwave oven with a rotating antenna has become known, the antenna arm of which is a segment of a circular area with an opening angle that is between 1/3 Pi and Pi. The circular surface segment has projections on the lateral boundaries, the width of which is approximately 1/6 of the wavelength of the microwaves.

Durch die DE-33 26 514 ist ein Mikrowellenofen mit einer rotierenden Antenne, deren Antennenarm asymmetrisch ausgeführt ist, vorgeschlagen worden. Damit soll die Aufgabe gelöst werden, die Mikrowellenabstrahlung in ihrer Gleichmäßigkeit zu verbessern und im Garraum eine einheitliche Erhitzung des Gargutes zu erreichen.DE-33 26 514 has proposed a microwave oven with a rotating antenna, the antenna arm of which is asymmetrical. This is intended to solve the problem of improving the uniformity of the microwave radiation and achieving a uniform heating of the food in the cooking space.

Durch die DE- 37 20 719 ist eine weitere Verbesserung von mit Drehantennen ausgerüsteten Mikrowellenöfen bekannt geworden. Zur Verbesserung der Energiedichte im Garraum werden insbesondere mikrowellenspezifische Diskontinuitäten angeordnet.A further improvement of microwave ovens equipped with rotary antennas has become known from DE 37 20 719. In order to improve the energy density in the cooking space, in particular microwave-specific discontinuities are arranged.

Durch die vorgenannten Druckschriften werden technischen Lehren angegeben, die direkt oder indirekt die Verbesserung der Garungsergebnisse in Mikrowellenöfen zum Ziel haben.The above-mentioned documents provide technical teachings which aim, directly or indirectly, to improve the cooking results in microwave ovens.

Der Erfindung liegt daher die Aufgabe zugrunde, mit einer speziellen Strahlereinheit eine weitere Verbesserung der Energiedichteverteilung im Garraum zu bewirken und damit die Garergebnisse über vergleichmäßigtere Energieverteilungen zu verbessern.The invention is therefore based on the object of using a special radiator unit to bring about a further improvement in the energy density distribution in the cooking space and thus to improve the cooking results by means of more uniform energy distributions.

Die erfindungsgemäße Anordnung zur Lösung dieser Aufgabe ist dadurch gekennzeichnet, daß eine außerhalb der Backofendeckfläche angeordnete Reflektormulde mit dem Wellenleiter und der Garraumdeckfläche verbunden ist, daß der in die Reflektormulde hineinragende, mit dem Feldrührer verbundene Mikrowellen-Auskoppelstift an einer Durchführungsstelle zwischen dem Wellenleiter und der Reflektormulde von mindestens zwei mikrowellenspezifischen Diskontinuitäten, die durch Verschraubungen und Materialverdickungen gebildet werden, umgeben ist, daß der Feldrührer eine Spirale ist, deren Gesamtlänge sehr viel größer ist als ihre Dicke und daß die Abdeckung die Reflektormulde garraumseitig begrenzt.The arrangement according to the invention for solving this problem is characterized in that a reflector trough arranged outside the oven top surface is connected to the waveguide and the cooking space top surface, and that the microwave coupling pin protruding into the reflector trough and connected to the field stirrer is connected at a passage point between the waveguide and the reflector trough is surrounded by at least two microwave-specific discontinuities, which are formed by screw connections and material thickening, that the field stirrer is a spiral, the total length of which is much greater than its thickness, and that the cover limits the reflector trough on the cooking space side.

Eine vorteilhafte Ausgestaltung der Erfindung besteht darin, daß die mikrowellenspezifischen Diskontinuitäten λ/8 lange Verschraubungen sind, die gleichzeitig den Wellenleiter mit der Reflektormulde mechanisch verbinden. Solche Diskontinuitäten stellen mikrowellentechnisch betrachtet Blindelemente dar und modellieren den Stromdichtebelag auf dem Antennenarm, wobei eine gleiche Wirkung auf ein Feldrührerelement vorhanden ist. Für eine gleichmäßigere mittlere Energieverteilung im Garraum ist es vorteilhaft, wenn die Drehantenne bzw. der Feldrührer möglichst oft mikrowellenspezifische Diskontinuitäten erfaßt und somit ständig ein Teil der Stromdichtebelages auf der jeweiligen Fläche der Antenne oder des Feldrührers durch zusätzliche Blindelemente beaufschlagt ist. Die geometrische Gestaltung der Antennenarm-Konfiguration bzw. des Feldrührers bewirkt zudem noch unterschiedliche Stromdichtebeläge, die ebenfalls eine vergleichmäßigtere Energieverteilung im Garraum zur Folge haben.An advantageous embodiment of the invention consists in that the microwave-specific discontinuities λ / 8 are long screw connections which mechanically connect the waveguide to the reflector trough at the same time. Such discontinuities represent blind elements from a microwave point of view and model the current density coating on the antenna arm, with the same effect on a field stirrer element. For a more uniform average energy distribution in the cooking space, it is advantageous if the rotary antenna or the field stirrer detects microwave-specific discontinuities as often as possible and thus part of the current density coating on the respective surface of the antenna or the field stirrer is constantly acted on by additional blind elements. The geometric design of the antenna arm configuration or the field stirrer also causes different current density coatings, which also result in a more even energy distribution in the cooking space.

Weitere vorteilhafte Ausgestaltungen des Erfindungsgedankens ergeben sich aus den Unteransprüchen. Ausführungsbeispiele nach der Erfindung werden nunmehr anhand der Zeichnung näher erläutert. Es zeigt:

Fig. 1
eine Feldrühreranordnung mit Reflektormulde,
Fig. 2
eine Feldrührer-Draufsicht.
Further advantageous refinements of the inventive concept result from the subclaims. Embodiments according to the invention will now be explained in more detail with reference to the drawing. It shows:
Fig. 1
a field stirrer arrangement with reflector trough,
Fig. 2
a field stirrer top view.

Gemäß Fig. 1 ist ein Antrieb 1, ein Lager 2, eine Achse 3, ein Wellenleiter 4, ein Auskoppelstift 5, eine Hohlleiterverschraubung 6, eine Reflektormulde 7, eine Rührerspirale 8, eine mikrowellendurchlässige Abdeckung 9, eine Backofendeckfläche 10 und eine Durchführungsöffnung 11 erkennbar.1, a drive 1, a bearing 2, an axis 3, a waveguide 4, a coupling pin 5, a waveguide screw connection 6, a reflector trough 7, a stirrer coil 8, a microwave-permeable cover 9, an oven cover surface 10 and a through opening 11 can be seen .

Die durch den Rührerantrieb 1 in Rotation versetzte Feldrührerspirale 8 befindet sich, mit dem Mikrowellen-Auskoppelstift 5 fest verbunden, innerhalb der Reflektormulde 7. Die Reflektormulde 7 ist außerhalb der Backofendeckfläche angeordnet und mit dem Wellenleiter 4 und der Backofendeckfläche 10 über Verschraubungen verbunden. Damit wird die konstruktive Gesamtanordnung von Wellenleiter 4 und dem System des Feldrührers auf der Wellenleiter-Durchführungsöffnung mittig zum Garraum zentriert. Die Hohlleiterverschraubungen 6 stellen mikrowellenspezifische Diskontinuitäten von der Länge λ/8 der Mikrowellen dar. Es ist aber auch denkbar, daß die mikrowellenspezifischen Diskontinuitäten als λ/8 lange ausgeformte Schweißnahtverdickungen ausgebildet sind. Die Reflektormulde 7 wird vorzugsweise einen kreisförmigen Querschnitt besitzen mit dem Radius von ca. λ/2 der Mikrowellen-Wellenlänge. Eine rechteckige Ausführung der Reflektormulde 7 ist ebenfalls möglich. Die Wellenleiter-Durchführungsöffnung 11 vom Hohlleiter 4 zur Reflektormulde 7 besitzt mindestens einen Durchmesser von λ/4 der Mikrowellen-Wellenlänge. Garraumseitig ist die Reflektormulde 7 mit einer Abdeckung 9 versehen, die aus mikrowellendurchlässigen, geringe dielektrische Verluste besitzenden Materialien besteht. Vorzugsweise wird für die Abdeckung 9 das Material Borsilikatglas verwendet, es können jedoch auch Kunststoffe mit geringen Er zum Einsatz gelangen. Der Feldrührer ist als eine Rührerspirale 8 ausgeführt, deren Draufsicht der Fig. 2 entnehmbar ist. Diese Ausführungsform hat in Zusammenhang mit der Ausbildung der Reflektormulde 7 und den mikrowellenspezifischen Diskontinuitäten 6 eine gute Energiedichteverteilung im Garraum zur Folge. Die Gesamtlänge der Rührerspirale ist sehr viel größer als die Dicke. Um eine Langzeitbeständigkeit der Rührerspirale zu garantieren, werden vorzugsweise Materialien verwendet, die sehr korrosionsbeständig sind und gute Langzeitkonstanz elektrischer Eigenschaften haben, beispielsweise Chrom-Nickel-Legierungen.The field stirrer spiral 8, which is set in rotation by the stirrer drive 1, is firmly connected to the microwave decoupling pin 5, within the reflector trough 7 Reflector trough 7 is arranged outside the oven top surface and is connected to the waveguide 4 and the oven top surface 10 via screw connections. The overall structural arrangement of waveguide 4 and the system of the field stirrer is thus centered on the waveguide leadthrough in the middle of the cooking space. The waveguide screw connections 6 represent microwave-specific discontinuities of the length λ / 8 of the microwaves. However, it is also conceivable that the microwave-specific discontinuities are designed as λ / 8 long weld thickenings. The reflector trough 7 will preferably have a circular cross section with a radius of approximately λ / 2 of the microwave wavelength. A rectangular design of the reflector trough 7 is also possible. The waveguide through opening 11 from the waveguide 4 to the reflector trough 7 has at least a diameter of λ / 4 of the microwave wavelength. On the cooking chamber side, the reflector trough 7 is provided with a cover 9 which consists of materials which are permeable to microwaves and have low dielectric losses. The material borosilicate glass is preferably used for the cover 9, but plastics with low E r can also be used. The field stirrer is designed as a stirrer spiral 8, the top view of which can be seen in FIG. 2. In connection with the design of the reflector trough 7 and the microwave-specific discontinuities 6, this embodiment results in a good energy density distribution in the cooking space. The total length of the stirrer spiral is much larger than the thickness. In order to guarantee the long-term stability of the stirrer spiral, materials are preferably used that are very corrosion-resistant and have good long-term constancy of electrical properties, for example chrome-nickel alloys.

Claims (10)

  1. Microwave household appliance, the high-frequency energy of which is produced by a magnetron and fed by way of a waveguide (4) to a radiator unit which consists of a microwave coupling-out pin (5) and a field stirrer (8) and has a cover consisting of a material of low dielectric losses, characterised thereby, that a reflector trough (7) arranged externally of a cooking chamber ceiling surface (10) is connected with the waveguide (4) and the cooking chamber ceiling surface (10), that the microwave coupling-out pin (5), which projects into the reflector trough (7) and is connected with the field stirrer (8), is surrounded by at least two microwave-specific discontinuities (6), which are formed by screw fastenings or thickened portions of material, at a feedthrough place (11) between the waveguide (4) and the reflector trough (7), that the field stirrer is a spiral, the overall length (L) of which is very much greater than its thickness and that the cover (9) bounds the reflector trough (7) at the cooking chamber side.
  2. Microwave household appliance according to claim 1, characterised thereby, that the field stirrer material is preferably a chrome-nickel alloy.
  3. Microwave household appliance according to claim 1, characterised thereby, that the microwave-specific discontinuities (6) are screw fastenings which have a length of λ/8 of the microwave wavelength and at the same time connect the waveguide (4) mechanically with the reflector trough (7).
  4. Microwave household appliance according to claim 1, characterised thereby, that the microwave-specific discontinuities (6) are thickened portions of welding seam, which are shaped out to have a length of λ/8 of the microwave wavelength and at the same time connect the waveguide (4) mechanically with the reflector trough (7).
  5. Microwave household appliance according to claim 1, characterised thereby, that the reflector trough (7) is of circular cross-section of a radius of about λ/2 of the microwave wavelength.
  6. Microwave household appliance according to claim 1, characterised thereby, that the reflector trough (7) is of rectangular cross-section.
  7. Microwave household appliance according to claim 1, characterised thereby, that the waveguide feedthrough opening towards the reflector trough (7) has a diameter of at least λ/4.
  8. Microwave household appliance according to claim 1, characterised thereby, that the cover (9) is in alignment with the baking oven ceiling surface (10) and consists of glass, preferably borosilicate glass.
  9. Microwave household appliance according to claim 1, characterised thereby, that the cover (9) consists of synthetic material.
  10. Microwave household appliance according to claim 1, characterised thereby, that the cover (9) consists of mica.
EP91118056A 1990-10-26 1991-10-23 Microwaves supply in microwave baking ovens Expired - Lifetime EP0482601B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4034161A DE4034161A1 (en) 1990-10-26 1990-10-26 MICROWAVE INPUT IN MICROWAVE OVENS
DE4034161 1990-10-26

Publications (2)

Publication Number Publication Date
EP0482601A1 EP0482601A1 (en) 1992-04-29
EP0482601B1 true EP0482601B1 (en) 1995-06-14

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EP91118056A Expired - Lifetime EP0482601B1 (en) 1990-10-26 1991-10-23 Microwaves supply in microwave baking ovens

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EP (1) EP0482601B1 (en)
JP (1) JPH04264387A (en)
DE (3) DE9017953U1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101448348B (en) * 2008-11-27 2011-06-15 电子科技大学 Spiral trumpet shaped microwave energy reclaiming antenna and array microwave heating apparatus thereof

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Publication number Priority date Publication date Assignee Title
ES2590035T3 (en) * 2009-12-30 2016-11-17 Arçelik Anonim Sirketi An oven
EP2950616B1 (en) * 2014-05-26 2018-11-07 Electrolux Appliances Aktiebolag Microwave oven with a waveguide including a reflector element
CN104791858A (en) * 2015-03-23 2015-07-22 广东美的厨房电器制造有限公司 Microwave oven
CN105357790B (en) * 2015-12-21 2018-01-12 电子科技大学 A kind of two-tube micro-wave oven for making radiator using spiral antenna with circular polarization
CN105392227B (en) * 2015-12-21 2017-12-15 电子科技大学 It is a kind of using micro-wave oven of the spiral antenna with circular polarization as radiator
CN105509108B (en) * 2015-12-21 2018-01-12 电子科技大学 A kind of micro-wave oven for using cylindrical chamber and making radiator with helical antenna
CN110191530B (en) * 2019-05-28 2021-10-29 中国电子科技集团公司第十二研究所 Microwave radiation heating device

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US3493709A (en) * 1968-10-25 1970-02-03 Gen Electric Spiral antenna for electronic oven
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101448348B (en) * 2008-11-27 2011-06-15 电子科技大学 Spiral trumpet shaped microwave energy reclaiming antenna and array microwave heating apparatus thereof

Also Published As

Publication number Publication date
DE9017953U1 (en) 1993-01-28
JPH04264387A (en) 1992-09-21
DE59105703D1 (en) 1995-07-20
DE4034161A1 (en) 1992-04-30
EP0482601A1 (en) 1992-04-29

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