DE3029035A1 - Microwave baking oven with HF generator - has aerial connecting waveguide with matching element in aerial region - Google Patents

Microwave baking oven with HF generator - has aerial connecting waveguide with matching element in aerial region

Info

Publication number
DE3029035A1
DE3029035A1 DE19803029035 DE3029035A DE3029035A1 DE 3029035 A1 DE3029035 A1 DE 3029035A1 DE 19803029035 DE19803029035 DE 19803029035 DE 3029035 A DE3029035 A DE 3029035A DE 3029035 A1 DE3029035 A1 DE 3029035A1
Authority
DE
Germany
Prior art keywords
aerial
generator
waveguide
oven
antenna
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
DE19803029035
Other languages
German (de)
Other versions
DE3029035C2 (en
Inventor
Peter Ing.(Grad.) 8540 Schwabach Klapper
Trung Dipl.-Ing. 8500 Nürnberg Pham-An
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.)
Licentia Patent Verwaltungs GmbH
Original Assignee
Licentia Patent Verwaltungs 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 Licentia Patent Verwaltungs GmbH filed Critical Licentia Patent Verwaltungs GmbH
Priority to DE19803029035 priority Critical patent/DE3029035C2/en
Publication of DE3029035A1 publication Critical patent/DE3029035A1/en
Application granted granted Critical
Publication of DE3029035C2 publication Critical patent/DE3029035C2/en
Expired 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
    • H05B6/72—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
    • 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
    • H05B6/70—Feed lines
    • H05B6/707—Feed lines using waveguides
    • H05B6/708—Feed lines using waveguides in particular slotted waveguides
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Constitution Of High-Frequency Heating (AREA)

Abstract

The microwave oven design is intended to prevent strong reflection of hf energy from the housing of its heater towards the hf generator in case of mismatch of useful hf power and the oven demand. Inside an oven housing is incorporated a baking chamber, into which the microwaves are propagated from a hf generator. For this purpose a waveguide (3) is used to which an aerial (6) is coupled. In the region of this aerial a matching element (10) is fitted in the waveguide. This element is preferably U-shaped and has a central bore for the passage of the aerial. The shanks of the U-shaped element are each fitted at its free ends with a lug, pointing away from the aerial. In this way the optimum operational point of the hf generator can be adjusted for any arbitrary baking oven coupling arrangement.

Description

Mikrowellenheizgerät Microwave heating device

Die Erfindung betrifft ein Mikrowellenheizgerät mit einem Garraum innerhalb eines Gehäuses mit einem Hochfrequenzgenerator für die Einleitung von Mikrowellen in den Garraum über mindestens einen Hohlleiter sowie über eine mit dem Hohlleiter in Verbindung stehenden Antenne.The invention relates to a microwave heating device with a cooking space inside a housing with a high frequency generator for the introduction of Microwaves in the oven via at least one waveguide and one with the antenna connected to the waveguide.

Bekanntermaßen kann eine starke Reflexion von Rochfrequenzenergie aus dem Gehäuse des Mikrowellenheizgerätes zum Rochfrequenzgenerator auftreten, wenn eine Fehlanpassung vorliegt. Unter Anpassung versteht man, daß die vom Eochfrequenzgenerator kommende Nutzleistung vollständig an den Verbraucher abgegeben wird. Die Leistung pflanzt sich in Richtung zum Verbraucher fort und wird nicht reflektiert. Um Anpassung zwischen verschiedenartigen Bauelementen, wie beispielsweise Hohlraum, Wellenleiter und deren Ubergangselemente herzustellen, müssen die Abschluß- und Durchgangselemente bestimmte Bedingungen erfüllen. Der Eingangswiderstand des Hohlraumresonators in der Koppelöffnung muß mit dem Wellenwiderstand der Leitung übereinstimmen oder aber durch ein Transformationsglied an den Wellenwiderstand angepaßt werden. Stoßstellen an Ubergängen wie Verzweigungen, Querschnittssprünge müssen ebenfalls reflexionsfrei ausgebildet sein.It is known that there can be a strong reflection of Roche frequency energy occur from the housing of the microwave heater to the radio frequency generator, if there is a mismatch. Adaptation means that the high frequency generator upcoming useful power is completely given to the consumer. The performance propagates towards the consumer and is not reflected. To adapt between different types of components, such as cavities, waveguides and to produce their transition elements, the closure and passage elements must meet certain conditions. The input resistance of the cavity resonator in the coupling opening must match the wave resistance of the line or else by a transformation element adapted to the wave resistance will. Joints at transitions such as branches, cross-sectional jumps must also be designed to be reflection-free.

Der Erfindung liegt die Aufgabe zugrunde, ein Mikrowellenheizgerät der eingangs genannten Art so zu verbessern, daß mit konstruktiv einfachen Mitteln der optimalste Arbeitspunkt des Hochfrequenzgenerators für beliebige Garraum-Einkopplungs-Gestaltungen eingestellt werden kann.The invention is based on the object of a microwave heating device to improve the type mentioned so that with structurally simple means the most optimal working point of the high-frequency generator for any cooking chamber coupling configuration can be adjusted.

Die erfindungsgemäße Lösung dieser Aufgabe ist dem kennzeichnenden Teil des Patentanspruchs 1 zu entnehmen.The inventive solution to this problem is the characteristic Part of claim 1 can be found.

Zweckmäßige Ausgestaltungen der Erfindung sind in den Unteransprüchen 2 und 3 angegeben.Appropriate refinements of the invention are set out in the subclaims 2 and 3 indicated.

Die Erfindung ermöglicht mit einem baulich besonders einfachen und damit preiswert herstellbaren Anpassungselement eine funktionssichere Einstellung des optimalsten Arbeitspunktes des Hochfrequenzgenerators.The invention allows with a structurally particularly simple and thus inexpensive to manufacture adapting element a functionally reliable setting the most optimal working point of the high frequency generator.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird an Hand dieser nachfolgend näher beschrieben.An embodiment of the invention is shown in the drawing and is described in more detail below on the basis of this.

Es zeigen Fig. 1 den Gar- bzw. Heizraum eines Mikrowellenheizgerätes mit der zugeordneten Mikrowellen-Zuführeinrichtung im Schnitt, Fig. 2 einen vergrößerten Ausschnitt aus dem Hohlleiter im Bereich der Antenneneinführung und Fig. 3 das erfindungsgemäße Anpassungselement in vergrößerter Einzeldarstellung.1 shows the cooking or heating space of a microwave heating device with the associated microwave feed device in section, FIG. 2 an enlarged Section of the waveguide in the area of the antenna entry and Fig. 3 the adaptation element according to the invention in an enlarged individual illustration.

In der Zeichnung ist mit 1 der Gar- bzw. Heizraum des Mikrowellenheizgerätes bezeichnet, der in einem nicht weiter dargestellten Gerätegehäuse eingebaut sein kann und der durch eine Tür 2 in üblicher Weise mikrowellendicht verschließbar ist. In dem Garraum 1 wird beim dargestellten Ausfuhrungsbeispiel über einen schachtartigen Hohlleiter 3 und äe einem boden- sowie deckseitigen gehäuseartigen Einkoppelkörper 4,4' Mikrowellenenergie eingeleitet, die von einem Hochfrequenzgenerator 5 bekannter Bauart erzeugt und über eine in den Hohlleiter 3 eingeführte Antenne 6 eingestrahlt wird. In jedem der beiden gehäuseartigen Einkoppelkörper 4, 4' ist äe ein als Reflektor wirkender Wellenrührer 7,7' untergebracht.In the drawing, 1 is the cooking or heating space of the microwave heater referred to, which can be installed in a device housing not shown can and which can be closed microwave-tight by a door 2 in the usual way. In the embodiment shown, in the cooking chamber 1 is a shaft-like Waveguide 3 and äe a bottom and top-side housing-like coupling body 4,4 'Microwave energy introduced by a high frequency generator 5 known Type generated and radiated via an antenna 6 inserted into the waveguide 3 will. In each of the two housing-like coupling bodies 4, 4 'there is a reflector Acting wave stirrer 7,7 'housed.

Die beiden gehäuseartigen Einkoppelkörper 4,4' sind zudem zum Garraum 1 hin durch eine plattenartige, geschlitzte Energieverteilungseinrichtung 8 abgedeckt. Im unteren Bereich des Garraumes 1 ist eine vorzugsweise aus glasartigem Material bestehende Abstellplatte 9 für einen nicht dargestellten Gargutbehälter mit Abstand zur Energieverteilungseinrichtung 8 angeordnet.The two housing-like coupling bodies 4,4 'are also to the cooking space 1 covered by a plate-like, slotted energy distribution device 8. In the lower area of the cooking space 1, one is preferably made of a glass-like material existing shelf 9 for a food container, not shown, at a distance to the energy distribution device 8 arranged.

Im Hohlleiter 3 ist gemäß der Erfindung ein metallisches U-förmiges sogen. Anpassungseleme-nt 10 eingesetzt, in dessen die beiden Schenkel 11, 11' verbindenden Basisteil 12 eine zentrale Bohrung 13 zum Hindurchführen der im Hohlleiter 3 endenden Antenne 6 des Hochfrequenzgenerators 5 angeordnet ist. Durch das vorgenannte Element 10 ist eine Anpassung des Hochfrequenzgenerators 5 an den Einkoppelteilen wie Hohlleiter 3, Einkoppelkörper 4,4' möglich. Die beiden Schenkel 11,11' des Anpassungselementes 10 sind in ihrer Länge in etwa der Länge der in dem Hohlleiter 3 ragenden Antenne 6 angepaßt und schirmen die Antenne nach zwei Seiten hin ab. Die Länge der Schenkel 11,11' ist etwas größer als die halbe Tiefe des Hohlleiters 3 gewählt. Das freie Ende jedes Schenkels 11,11' ist zweckmäßig mit einer von der Antenne 6 abgewandten, in Mikrowellenleitungsrichtung gerichteten Nase 13,13' versehen, die durch entsprechendes Umbiegen der Schenkelenden gebildet ist. Die Breite des Ausgangselementes 10 ist etwas kleiner als die Breite des schachtartigen Hohlleiters 3 gewählt.In the waveguide 3 is a metallic U-shaped according to the invention sucked Adaptation element 10 used, in which the two legs 11, 11 'connecting Base part 12 has a central bore 13 for passing the ends in the waveguide 3 through Antenna 6 of the high frequency generator 5 is arranged. By the aforementioned element 10 is an adaptation of the high frequency generator 5 to the coupling parts such as waveguides 3, coupling body 4,4 'possible. The two legs 11, 11 'of the adaptation element 10 are approximately the length of the antenna protruding in the waveguide 3 in their length 6 adapted and shield the antenna on two sides. the The length of the legs 11, 11 ′ is somewhat greater than half the depth of the waveguide 3 chosen. The free end of each leg 11,11 'is useful with one of the Antenna 6 facing away, in the direction of microwave transmission nose 13, 13 'provided, which is formed by corresponding bending of the leg ends. The width of the Output element 10 is slightly smaller than the width of the shaft-like waveguide 3 elected.

ee

Claims (3)

Patentansprüche 0 Mikrowellenheizgerät mit einem Garraum innerhalb eines Gehäuses, mit einem Hochfrequenzgenerator für die Einleitung von Mikrowellen in den Garraum über mindestens einen Hohlleiter sowie über eine mit dem Hohlleiter in Verbindung stehenden Antenne, dadurch gekennzeichnet, daß im Hohlleiter (3) im Bereich der Antenne (6) ein Anpassungselement (10) angeordnet ist. Claims 0 microwave heater with a cooking space inside a housing with a high frequency generator for the introduction of microwaves into the cooking space via at least one waveguide and via one with the waveguide related antenna, characterized in that in the waveguide (3) in An adaptation element (10) is arranged in the area of the antenna (6). 2. Nikrowellenheizgerät nach Anspruch 1, dadurch gekennzeichnet, daß das Anpassungselement (10) U-förmig ausgebildet und eine zentrale Bohrung (13) für die Durchführung der Antenne (6) aufweist. 2. Microwave heater according to claim 1, characterized in that that the adapter element (10) is U-shaped and has a central bore (13) for the implementation of the antenna (6). 3. Nikrowellenheizgerät nach Anspruch 2, dadurch gekennzeichnet, daß die Schenkel (11, 11') des U-förmigen Anpassungselementes (10) am freien Ende mit je einer von der Antenne (6) abgewandten Nase (13,13') versehen sind. 3. Microwave heater according to claim 2, characterized in that that the legs (11, 11 ') of the U-shaped adapter element (10) at the free end are each provided with a nose (13, 13 ') facing away from the antenna (6).
DE19803029035 1980-07-31 1980-07-31 Microwave heating device Expired DE3029035C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19803029035 DE3029035C2 (en) 1980-07-31 1980-07-31 Microwave heating device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19803029035 DE3029035C2 (en) 1980-07-31 1980-07-31 Microwave heating device

Publications (2)

Publication Number Publication Date
DE3029035A1 true DE3029035A1 (en) 1982-02-25
DE3029035C2 DE3029035C2 (en) 1982-11-11

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Family Applications (1)

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DE19803029035 Expired DE3029035C2 (en) 1980-07-31 1980-07-31 Microwave heating device

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Country Link
DE (1) DE3029035C2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4496814A (en) * 1983-01-10 1985-01-29 General Electric Company Microwave excitation system
WO2002003760A1 (en) * 2000-06-30 2002-01-10 Microwave Ovens Limited Improvements in or relating to microwave ovens
WO2003079730A1 (en) * 2002-03-20 2003-09-25 Rimm Technologies Corporation N.V. Method and device combining a focussed microwave field and translation means
WO2003079731A1 (en) * 2002-03-20 2003-09-25 Rimm Technologies Corporation N.V. Method and installation combining focussed microwave fields with infrared irradiation

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE9003012L (en) * 1990-09-21 1991-09-16 Whirlpool Int MICROWAVE OVEN, METHOD FOR EXCITING THE CAVITY IN A MICROWAVE OVEN, AND GUIDANCE MANUAL FOR THE IMPLEMENTATION OF THE METHOD
DE4034161A1 (en) * 1990-10-26 1992-04-30 Bosch Siemens Hausgeraete MICROWAVE INPUT IN MICROWAVE OVENS
SE501494C2 (en) * 1993-07-02 1995-02-27 Whirlpool Europ Microwave Input Method of a Microwave Heater and Microwave Heater

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3127494A (en) * 1961-03-13 1964-03-31 Studebaker Corp Microwave heating apparatus
US3437777A (en) * 1966-06-17 1969-04-08 Tokyo Shibaura Electric Co Microwave heating apparatus
GB1231316A (en) * 1968-07-29 1971-05-12
DE2322036A1 (en) * 1972-05-03 1973-12-13 Sage Laboratories MICROWAVE OVEN
DE2424778A1 (en) * 1973-06-04 1975-01-02 Amana Refrigeration Inc WAVE GUIDE FILTERS, IN PARTICULAR FOR MICROWAVE DEVICES
US4019010A (en) * 1974-04-17 1977-04-19 Matsushita Electric Industrial Co., Ltd. Microwave oven with uniform electric field distribution
US4079221A (en) * 1976-04-15 1978-03-14 Roper Corporation Microwave oven having waveguide feed with phase shifter
JPS5356737A (en) * 1976-11-01 1978-05-23 Matsushita Electric Ind Co Ltd High-frequency heater

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3127494A (en) * 1961-03-13 1964-03-31 Studebaker Corp Microwave heating apparatus
US3437777A (en) * 1966-06-17 1969-04-08 Tokyo Shibaura Electric Co Microwave heating apparatus
GB1231316A (en) * 1968-07-29 1971-05-12
DE2322036A1 (en) * 1972-05-03 1973-12-13 Sage Laboratories MICROWAVE OVEN
DE2424778A1 (en) * 1973-06-04 1975-01-02 Amana Refrigeration Inc WAVE GUIDE FILTERS, IN PARTICULAR FOR MICROWAVE DEVICES
US4019010A (en) * 1974-04-17 1977-04-19 Matsushita Electric Industrial Co., Ltd. Microwave oven with uniform electric field distribution
US4079221A (en) * 1976-04-15 1978-03-14 Roper Corporation Microwave oven having waveguide feed with phase shifter
JPS5356737A (en) * 1976-11-01 1978-05-23 Matsushita Electric Ind Co Ltd High-frequency heater

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4496814A (en) * 1983-01-10 1985-01-29 General Electric Company Microwave excitation system
WO2002003760A1 (en) * 2000-06-30 2002-01-10 Microwave Ovens Limited Improvements in or relating to microwave ovens
WO2003079730A1 (en) * 2002-03-20 2003-09-25 Rimm Technologies Corporation N.V. Method and device combining a focussed microwave field and translation means
WO2003079731A1 (en) * 2002-03-20 2003-09-25 Rimm Technologies Corporation N.V. Method and installation combining focussed microwave fields with infrared irradiation
FR2837659A1 (en) * 2002-03-20 2003-09-26 Rimm Technologies Corp N V System for combining focussed microwave field and translation unit for it, used for heating food products or blood plasma for medical purposes
FR2837657A1 (en) * 2002-03-20 2003-09-26 Rimm Technologies Corp N V Combined microwave and infrared cooker uses at least two microwaves in looped waveguide with infrared radiation source inside it

Also Published As

Publication number Publication date
DE3029035C2 (en) 1982-11-11

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OP8 Request for examination as to paragraph 44 patent law
D2 Grant after examination
8363 Opposition against the patent
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