EP0344438B1 - Microwave household appliance - Google Patents

Microwave household appliance Download PDF

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Publication number
EP0344438B1
EP0344438B1 EP89106832A EP89106832A EP0344438B1 EP 0344438 B1 EP0344438 B1 EP 0344438B1 EP 89106832 A EP89106832 A EP 89106832A EP 89106832 A EP89106832 A EP 89106832A EP 0344438 B1 EP0344438 B1 EP 0344438B1
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EP
European Patent Office
Prior art keywords
waveguide
cooking space
excitation
microwave
appliance according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP89106832A
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German (de)
French (fr)
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EP0344438A1 (en
Inventor
Wolfgang Dipl.-Ing. Beifuss
Julius Dipl.-Ing. Husslein
Martin Dipl.-Ing. Schulte
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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
    • H05B6/72—Radiators or antennas
    • H05B6/725—Rotatable antennas
    • 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
    • H05B6/6402—Aspects relating to the microwave cavity
    • 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 invention relates to a microwave household appliance according to the preamble of claim 1.
  • the coupling of the microwave power without rotating parts results in load-dependent, permanently impressed structures of energy maxima and energy minima in the cooking space of a microwave oven.
  • the resulting poor energy density distribution in the cooking space was tried to be remedied on the one hand by wobblers and rotating antennas, and on the other hand field stirrers were arranged in the waveguide.
  • the object of the invention is therefore to improve the power consumption and energy density distribution of the cooking space and to reduce the constructive wall compared to wobbler and rotating antenna applications by means of at least one rotatably mounted field stirrer arranged in the waveguide in combination with the coupling geometry between the waveguide and the cooking space and the cooking space design.
  • the position of the rotatably mounted field stirrer in the waveguide is combined with the position and size of the coupling opening in the waveguide and in the cooking space ceiling and in combination with the design of the cooking space.
  • the optimized coupling geometry combined with a cooking chamber optimized for microwave use significantly improves the maximum coupling microwave energy and the degree of homogenization of the microwave energy to the cooking chamber.
  • a magnetron 1 feeds a waveguide 2 in which there is a field stirrer 3 which is rotatably fastened to the waveguide ceiling.
  • the field stirrer 3 is arranged in the vicinity of a coupling opening 4 to a cooking chamber 5.
  • the coupling opening 4 is located in the middle of the cooking chamber and is partially swept by the field stirrer.
  • the coupling opening 4 is sealed by a microwave-permeable cover 7.
  • This cover 7 is designed to be removable for the purpose of cleaning and any replacement that may be necessary and is made, for example, of borosilicate glass.
  • the cooking chamber 5 is constructed symmetrically with regard to its oven-specific construction elements and has the minimum dimensions for cooking chamber height ⁇ 2 ⁇ , cooking chamber width and depth ⁇ 3 ⁇ of the wavelength of the microwaves.
  • a high, evenly distributed energy density prevails in the cooking chamber while avoiding partially high energy densities, which occur in a limited area on the food as direct images of the energy density of the coupling media and are undesirable for the cooking process.
  • FIG. 1b shows a schematic arrangement of two coupling openings 4.1 and 4.2 led from a waveguide 2 into the cooking chamber 5, the field stirrer 3 being arranged in front of the coupling openings 4.1 and 4.2.
  • 1c shows a schematic arrangement of two coupling openings 4.1 and 4.2 led into the cooking space 5, the field stirrer 3 being arranged between the coupling openings 4.1 and 4.2.
  • the design of a waveguide 2, the coupling opening 4 of which is arranged at the waveguide end, is shown.
  • the waveguide 3.1 is rotatably mounted on a waveguide side wall, the cooking chamber 5 has the minimum dimensions already specified.
  • the position of the field stirrer 3.1 with respect to the coupling opening 4.3 lies in the spatial center of the waveguide end piece located above the coupling opening.
  • the metal arm of the field stirrer is mounted in a Teflon pin 6, which in turn is rotatably arranged in the waveguide side wall.
  • the cooking space 5 with the minimum dimensions of 2 ⁇ for the cooking space height and 3 ⁇ for the cooking space width u. -deposed.
  • the advantages of this combinatorial arrangement are the improved efficiency and a good equalization of the energy density in relation to a wide range of food, i.e. different cooking space loads.

Description

Die Erfindung bezieht sich auf ein Mikrowellen-Haushaltgerät gemäß dem Oberbegriff des Anspruches 1.The invention relates to a microwave household appliance according to the preamble of claim 1.

Eine derartige Anordnung ist durch die US-PS 4 334 137 bekannt.Such an arrangement is known from U.S. Patent 4,334,137.

Die Einkopplung der Mikrowellen-Leistung ohne drehende Teile, als starre Ankopplung bekannt, ergibt im Garraum eines Mikrowellen-Gerätes lastabhängige, fest eingeprägte Strukturen von Energiemaxima und Energieminima. Die daraus entstehende schlechte Energiedichteverteilung im Garraum wurde einerseits durch Wobbler und Drehantennen zu beheben versucht, und andererseits wurden Feldrührer im Hohlleiter angeordnet.The coupling of the microwave power without rotating parts, known as a rigid coupling, results in load-dependent, permanently impressed structures of energy maxima and energy minima in the cooking space of a microwave oven. The resulting poor energy density distribution in the cooking space was tried to be remedied on the one hand by wobblers and rotating antennas, and on the other hand field stirrers were arranged in the waveguide.

Eine gewisse Verbesserung der Energiedichteverteilung wurde durch diese Maßnahmen im allgemeinen erreicht.A certain improvement in the energy density distribution was generally achieved by these measures.

Die bislang erzielten Wirkungsgrade und der dazugehörige Grad der Vergleichmäßigung der Energiedichteverteilung im Verhältnis zum technologischen und konstruktiven Aufwand sind jedoch noch verbesserunsbedürftig.However, the previously achieved efficiencies and the associated degree of equalization of the energy density distribution in relation to the technological and structural effort are still in need of improvement.

Durch die US-PS 3 949 184 und die US-PS 4 334 137 sind Feldrührer, die im Hohlleiter angeordnet sind, bekanngeworden.Field stirrers which are arranged in the waveguide have become known from US Pat. No. 3,949,184 and US Pat. No. 4,334,137.

Die Anordnung des Feldrührers nach US-PS 3 949 184 bezüglich der Hohlleiterposition und der Einkoppelöffnung garraumseitig ist als asymmetrisch anzusehen, wobei die Garraumabmessungen bezüglich der Anordnungen von Hohlleiter und Feldrührer in einem undefinierten Verhältnis zueinander stehen. Die rotierenden Arme des Feldrührers, der an der Hohlleiterdecke befestigt ist, sind in horizontaler Ebene geführt. Neben einem recht komplizierten Gesamtaufbau, der für ein Mikrowellen-Haushaltgerät wenig vorteilhaft ist, kann eine Aussage zum Wirkungsgrad der Anordnung bezüglich representativer Kochergebnisse nicht getroffen werden.The arrangement of the field stirrer according to US Pat. No. 3,949,184 with respect to the waveguide position and the coupling-in opening on the cooking chamber side is to be regarded as asymmetrical, the cooking chamber dimensions being in an undefined relationship with respect to the arrangements of the waveguide and field stirrer. The rotating arms of the field stirrer, which is attached to the waveguide ceiling, are guided in a horizontal plane. In addition to a rather complicated overall structure, which is not very advantageous for a microwave household appliance, no statement can be made about the efficiency of the arrangement with regard to representative cooking results.

Aufgabe der Erfindung ist es daher, durch mindestens einen im Hohlleiter angeordneten, drehbar gelagerten Feldrührer in Kombination mit der Einkoppelgeometrie zwischen Hohlleiter und Garraum und der Garraumgestaltung die Leistungsaufnahme und Energiedichteverteilung des Garraumes zu verbessern und den konstruktiven Afwand gegenüber Wobbler- und Drehantennenanwendungen zu senken.The object of the invention is therefore to improve the power consumption and energy density distribution of the cooking space and to reduce the constructive wall compared to wobbler and rotating antenna applications by means of at least one rotatably mounted field stirrer arranged in the waveguide in combination with the coupling geometry between the waveguide and the cooking space and the cooking space design.

Die erfindungsgemäße Anordnung zur Lösung dieser Aufgabe ist gekennzeichnet durch die Merkmale des Kennzeichnungsteils von Patentanspruch 1.The arrangement according to the invention for solving this problem is characterized by the features of the characterizing part of patent claim 1.

Durch die erfindungsgemäße Anordnung ist die Position des drehbar gelagerten Feldrührers im Hohlleiter in Kombination zur Lage und Größe der Einkoppelöffnung im Hohlleiter und in der Garraumdecke und in Kombination zur Garraumgestaltung gebracht. Durch die optimierte Einkoppelgeometrie kombiniert mit einem für Mikrowellenanwendung optimierten Garraum wird die maximal eingekoppelte Mikrowellen-Energie und der Grad der Vergleichmäßigung der Mikrowellen-Energie zum Garraum wesentlich verbessert.As a result of the arrangement according to the invention, the position of the rotatably mounted field stirrer in the waveguide is combined with the position and size of the coupling opening in the waveguide and in the cooking space ceiling and in combination with the design of the cooking space. The optimized coupling geometry combined with a cooking chamber optimized for microwave use significantly improves the maximum coupling microwave energy and the degree of homogenization of the microwave energy to the cooking chamber.

Vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen enthalten.Advantageous embodiments of the invention are contained in the subclaims.

Ein Ausführungsbeispiel nach der Erfindung ist im folgenden an Hand der Zeichnung näher beschrieben.An embodiment of the invention is described below with reference to the drawing.

Es zeigt

Fig. 1a
eine schematisierte Anordnung von einem mittig gespeisten Garraum,
Fig. 1b
eine schematisierte Anordnung von zwei aus einem Hohlleiter in den Garraum geführten Einkoppelöffnungen, wobei der Feldrührer vor den Einkoppelöffnungen angeordnet ist,
Fig. 1c
eine schematisierte Anordnung von zwei aus einem Hohlleiter in den Garraum geführten Einkoppelöffnungen, wobei der Feldrührer zwischen den Einkoppelöffnungen angeordnet ist,
Fig. 2a
eine Hohlleiteranordnung mit λ/2-Koppelöffnungen und seitlich mittig darüber angeordneten Feldrührer,
Fig. 2b
eine Draufsicht der Fig. 2a,
Fig. 3
eine maßstäbliche Darstellung der Anordnung eines mittig gespeisten Garraumes.
It shows
Fig. 1a
a schematic arrangement of a cooking chamber fed in the middle,
Fig. 1b
2 shows a schematic arrangement of two coupling openings led from a waveguide into the cooking space, the field stirrer being arranged in front of the coupling openings,
Fig. 1c
2 shows a schematic arrangement of two coupling openings led from a waveguide into the cooking space, the field stirrer being arranged between the coupling openings,
Fig. 2a
a waveguide arrangement with λ / 2 coupling openings and field stirrer arranged laterally in the middle above,
Fig. 2b
a plan view of Fig. 2a,
Fig. 3
a scale representation of the arrangement of a centrally fed cooking space.

Gemäß der Anordnung nach Fig. 1a speist ein Magnetron 1 einen Hohlleiter 2, in dem sich ein Feldrührer 3, der an der Hohlleiterdecke drehbar befestigt ist, befindet. Der Feldrührer 3 ist in der Umgebung einer Einkoppelöffnung 4 zu einem Garraum 5 angeordnet. Die Einkoppelöffnung 4 befindet sich in der Garraummitte und wird vom Feldrührer teilweise überstrichen Der Feldrührer 3 besitzt Metallarme, die in E = u./o. H = Ebene rotieren und über der Einkoppelöffnung 4, die mindestens λ/2 der Wellenlänge der Mikrowellen lang und breit ist, Mikrowellenenergie in den Garraum 5 einkoppeln Die Metallarme des Feldrührers sind an Keramik- oder Kunststoffstiften 6 befestigt, wobei als Kunststoffstifte vorzugsweise Teflonstifte verwendet werden. Um eine Verschmutzung von Hohlleiter 2 und Feldrührer 3 vom Garraum 5 her auszuschließen, wird die Einkoppelöffnung 4 durch eine mikrowellendurchlässige Abdeckung 7 abgedichtet. Diese Abdeckung 7 ist zum Zwecke der Reinigung und eines evtl. notwendigen Austausches herausnehmbar ausgeführt und besteht beispielsweise aus Borsilikatglas. In Abstimmung zu den Hohlleiterdaten ist der Garraum 5 aus der Sicht der Einkoppelöffnung 4 bezüglich seiner herdspezifischen Konstruktionselemente symmetrisch aufgebaut und besitzt die Mindestabmaße für Garraumhöhe ≧ 2λ, Garraumbreite und -tiefe ≧ 3λ der Wellenlänge der Mikrowellen.According to the arrangement according to FIG. 1a, a magnetron 1 feeds a waveguide 2 in which there is a field stirrer 3 which is rotatably fastened to the waveguide ceiling. The field stirrer 3 is arranged in the vicinity of a coupling opening 4 to a cooking chamber 5. The coupling opening 4 is located in the middle of the cooking chamber and is partially swept by the field stirrer. The field stirrer 3 has metal arms which in E = u./o. H = rotate the plane and couple the microwave energy into the cooking chamber 5 above the coupling opening 4, which is at least λ / 2 the wavelength of the microwaves long and wide. The metal arms of the field stirrer are fastened to ceramic or plastic pins 6, Teflon pins preferably being used as plastic pins . In order to prevent contamination of the waveguide 2 and field stirrer 3 from the cooking chamber 5, the coupling opening 4 is sealed by a microwave-permeable cover 7. This cover 7 is designed to be removable for the purpose of cleaning and any replacement that may be necessary and is made, for example, of borosilicate glass. In coordination with the waveguide data, from the perspective of the coupling-in opening 4, the cooking chamber 5 is constructed symmetrically with regard to its oven-specific construction elements and has the minimum dimensions for cooking chamber height ≧ 2λ, cooking chamber width and depth ≧ 3λ of the wavelength of the microwaves.

Durch die Kombination von optimaler Hohlleitergestaltung mit dem genannten Herdaufbau bezüglich der Garraumwerte, wird, verbunden mit dem im Hohlleiter vorteilhaft angeordneten Feldrührer, eine sehr gute Vergleichmäßigung der eingekoppelten Mikrowellenenergie erreicht. Im Garraum herrscht also eine hohe gleichverteilte Energiedichte unter Vermeidung partiell hoher Energiedichten, die flächenbegrenzt auf dem Gargut als direkte Abbilder der Energiedichte der Einkoppelmedien auftreten und für den Garungsprozeß unerwünscht sind.The combination of the optimal waveguide design with the oven design mentioned with regard to the cooking space values, combined with the field stirrer advantageously arranged in the waveguide, achieves very good homogenization of the coupled-in microwave energy. A high, evenly distributed energy density prevails in the cooking chamber while avoiding partially high energy densities, which occur in a limited area on the food as direct images of the energy density of the coupling media and are undesirable for the cooking process.

Gemäß Fig. 1b ist eine schematisierte Anordnung von zwei aus einem Hohlleiter 2 in den Garraum 5 geführten Einkoppelöffnungen 4.1 und 4.2, wobei der Feldrührer 3 vor den Einkoppelöffnungen 4.1 und 4.2 angeordnet ist, dargestellt.1b shows a schematic arrangement of two coupling openings 4.1 and 4.2 led from a waveguide 2 into the cooking chamber 5, the field stirrer 3 being arranged in front of the coupling openings 4.1 and 4.2.

Diese Anordnung von Feldrührer 3 und Einkoppelöffnungen 4.1 und 4.2 erbringt keine besseren Energievergleichmäßigungen als die Anordnung nach Fig. 1. Für Anordnung und Ausführung des Feldrührers gilt das unter der Beschreibung für Fig. 1a gesagte.This arrangement of field stirrer 3 and coupling openings 4.1 and 4.2 does not produce better energy equalizations than the arrangement according to FIG. 1. For the arrangement and design of the field stirrer, what was said under the description for FIG. 1a applies.

Für die Beschreibung des Garraum 5 ebenso.
Gemäß Fig. 1c ist eine schematisierte Anordnung von zwei in den Garraum 5 geführten Einkoppelöffnungen 4.1 und 4.2, wobei der Feldrührer 3 zwischen den Einkoppelöffnungen 4.1 und 4.2 angeordnet ist, dargestellt.For the description of the cooking space 5 as well.
1c shows a schematic arrangement of two coupling openings 4.1 and 4.2 led into the cooking space 5, the field stirrer 3 being arranged between the coupling openings 4.1 and 4.2.

Für diese Feldrühreranordnung wird die Aufgabenstellung ebenfalls erfüllt, wenn für den Garraum 5 das unter der Beschreibung der Fig. 1a gesagte vorausgesetzt wird. Ordnet man die wieder λ/2 langen und breiten Einkoppelöffnungen 4.1 und 4.2 im Abstand von λ an und plaziert den Feldrührer 3 mittig, so steigt der Wirkungsgrad bezüglich der Energieeinkoppelung leicht an.For this field stirrer arrangement, the task is also fulfilled if, for the cooking chamber 5, what has been said under the description of FIG. 1a is assumed. If the λ / 2 long and wide coupling openings 4.1 and 4.2 are arranged at a distance of λ and the field stirrer 3 is placed in the center, the efficiency with regard to the energy coupling increases slightly.

Gemäß der Anordnung nach den Figuren 2a und 2b ist die Ausführung eines Hohlleiters 2, dessen Einkoppelöffnung 4 am Hohlleiterende angeordnet ist, dargestellt. Der Hohlleiter 3.1 ist an einer Hohlleiterseitenwand drehbar gelagert, der Garraum 5 besitzt die bereits angegebene Mindestabmaße.According to the arrangement according to FIGS. 2a and 2b, the design of a waveguide 2, the coupling opening 4 of which is arranged at the waveguide end, is shown. The waveguide 3.1 is rotatably mounted on a waveguide side wall, the cooking chamber 5 has the minimum dimensions already specified.

Die Position des Feldrührers 3.1 bezogen auf die Einkoppelöffnung 4.3 liegt in der räumlichen Mitte des über der Einkoppelöffnung befindlichen Hohlleiterendstückes. Gelagert wird der Metallarm des Feldrührers in einem Teflon-Stift 6, der seinerseits drehbar gelagert in der Hohlleiterseitenwand angeordnet ist. In Kombination mit dem durch die Mindestabmaße gekennzeichneten Garraum ist diese Einkoppelvariante bezogen auf verschiedene Garraumlasten bezüglich der Energievergleichmäßigung vorteilhaft.The position of the field stirrer 3.1 with respect to the coupling opening 4.3 lies in the spatial center of the waveguide end piece located above the coupling opening. The metal arm of the field stirrer is mounted in a Teflon pin 6, which in turn is rotatably arranged in the waveguide side wall. In combination with the cooking space characterized by the minimum dimensions, this coupling variant is advantageous in terms of energy equalization in relation to different cooking space loads.

Gemäß der Anordnung nach Fig. 3 ist die Kombination Hohlleiter, Einkoppelöffnung, Garraum maßstäblich dargestellt. Der Hohlleiter 2 erfüllt die im Anspruch 1 genannten Bedingungen;

  • die Einkoppelöffnung 4.3 ist mindestens λ/2 der Wellenlänge der Mikrowellen lang und breit,
  • die Einkoppelöffnung 4.3 befindet sich am Hohlleiterende und ist mittig zur Garraumdecke angeordnet,
  • in der Umgebung der Einkoppelöffnung 4.3 befindet sich ein Feldrührer 3 (nicht dargestellt).
According to the arrangement according to FIG. 3, the combination waveguide, coupling opening, cooking space is shown to scale. The waveguide 2 fulfills the conditions mentioned in claim 1;
  • the coupling opening 4.3 is at least λ / 2 of the wavelength of the microwaves long and wide,
  • the coupling opening 4.3 is located at the waveguide end and is arranged in the center of the cooking space ceiling,
  • There is a field stirrer 3 (not shown) in the vicinity of the coupling opening 4.3.

In Kombination dazu ist der Garraum 5 mit den Mindestabmaßen von 2λ für die Garraumhöhe und von 3λ für die Garraumbreite u. -tiefe angeordnet. Die Vorteile dieser kombinatorischen Anordnung liegen im verbesserten Wirkungsgrad und einer guten Vergleichmäßigung der Energiedichte bezogen auf ein breites Kochgutspektrum, also unterschiedlicher Garraumlasten.In combination, the cooking space 5 with the minimum dimensions of 2λ for the cooking space height and 3λ for the cooking space width u. -deposed. The advantages of this combinatorial arrangement are the improved efficiency and a good equalization of the energy density in relation to a wide range of food, i.e. different cooking space loads.

Als weitere Vorteile ergeben sich eine Verminderung des konstruktiven Aufwandes gegenüber Wobbler- und Drehantennenanordnungen, bessere Garraumausnutzung und geringere Störanfälligkeit im starken Lastfall, da keine drehenden Teile mit deren spezifischen Anfälligkeiten im Garraum angeordnet sind.Further advantages are a reduction in the design effort compared to wobbler and rotating antenna arrangements, better utilization of the cooking space and less susceptibility to faults in the heavy load case, since no rotating parts with their specific vulnerabilities are arranged in the cooking space.

Claims (8)

  1. Domestic microwave appliance, wherein the microwave energy produced by a magnetron is fed into at least one waveguide which connects the energy source with the energy input point for a load in a cooking space, wherein arrangements specifically for microwaves are present in the waveguide, which even out the energy density in the cooking space, characterised thereby, that a field stirrer (3), which is borne to be rotatable at a lateral waveguide surface or at the waveguide ceiling and provided with metal arms in the E and/or H plane concerning the initial position, is arranged in the neighbourhood of at least one excitation opening (4) of the waveguide (2), which opening is covered by microwave permeable material (7), preferably begins at the waveguide end and has a width and length of at least half the wavelength (λ) of the microwaves and is disposed in the centre of the cooking space ceiling, and that in combination therewith the cooking space height amounts to at least 2λ and the cooking space width and depth each to at least 3 times the wavelength (λ) of the microwaves, wherein the cooking space (5) from the aspect of the microwave excitation opening (4) is built up symmetrically with its constructional elements specifically for the cooker and no metallic constructions are arranged at the cooker space side in the near microwave field directly below the excitation opening (4).
  2. Domestic microwave appliance according to claim 1, characterised thereby, that the cover (7) of the excitation opening (4, 4.1, 4.2) preferably consists of borosilicate glass and is arranged to be removable.
  3. Domestic microwave appliance according to claim 1, characterised thereby, that the constructional elements specifically for the cooker, which for example consist of grilling equipments and devices for cooking space accessories, are arranged symmetrically with respect to the excitation opening (4) and do not cover this in the near microwave field at the cooker space side.
  4. Domestic microwave appliance according to claim 1 and 3, characterised thereby, that for the use of several excitation openings (4), which may be allocated to more than one waveguide (2), these are arranged symmetrically in the cooking space ceiling.
  5. Domestic microwave appliance according to claim 1, characterised thereby, that the field stirrer (3), which is provided with metal arms in the E and/or H plane and borne to be rotatable in the waveguide (2), is arranged above the excitation opening (4).
  6. Domestic microwave appliance according to claim 1 and 5, characterised thereby, that the field stirrer (3) is arranged in front of the excitation opening (4).
  7. Domestic microwave appliance according to claim 1 and 5, characterised thereby, that the waveguide (2) has two excitation openings (4) arranged at a minimum spacing of twice the wavelength (λ) of the microwaves and that the field stirrer (3) is arranged in front of these.
  8. Domestic microwave appliance according to claim 1, 5 and 7, characterised thereby, that the field stirrer (3) is arranged between both excitation openings (4).
EP89106832A 1988-05-31 1989-04-17 Microwave household appliance Expired - Lifetime EP0344438B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3818490 1988-05-31
DE3818490A DE3818490A1 (en) 1988-05-31 1988-05-31 MICROWAVE HOUSEHOLD APPLIANCE

Publications (2)

Publication Number Publication Date
EP0344438A1 EP0344438A1 (en) 1989-12-06
EP0344438B1 true EP0344438B1 (en) 1993-12-08

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DE (2) DE3818490A1 (en)
ES (1) ES2047054T3 (en)

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Also Published As

Publication number Publication date
DE3818490A1 (en) 1989-12-07
DE58906337D1 (en) 1994-01-20
ES2047054T3 (en) 1994-02-16
DE3818490C2 (en) 1991-05-29
EP0344438A1 (en) 1989-12-06

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