EP0284958B1 - Dispositif de couplage d'un champ à micro-ondes à un four à micro-ondes - Google Patents

Dispositif de couplage d'un champ à micro-ondes à un four à micro-ondes Download PDF

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Publication number
EP0284958B1
EP0284958B1 EP19880104551 EP88104551A EP0284958B1 EP 0284958 B1 EP0284958 B1 EP 0284958B1 EP 19880104551 EP19880104551 EP 19880104551 EP 88104551 A EP88104551 A EP 88104551A EP 0284958 B1 EP0284958 B1 EP 0284958B1
Authority
EP
European Patent Office
Prior art keywords
coupling
waveguide
field
microwave
resonance chamber
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
Application number
EP19880104551
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German (de)
English (en)
Other versions
EP0284958A1 (fr
Inventor
Jakob Heierli
Edwin Schär
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.)
GIGATHERM AG
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GIGATHERM AG
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Filing date
Publication date
Application filed by GIGATHERM AG filed Critical GIGATHERM AG
Publication of EP0284958A1 publication Critical patent/EP0284958A1/fr
Application granted granted Critical
Publication of EP0284958B1 publication Critical patent/EP0284958B1/fr
Anticipated expiration legal-status Critical
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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/72—Radiators or 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
    • H05B2206/00—Aspects relating to heating by electric, magnetic, or electromagnetic fields covered by group H05B6/00
    • H05B2206/04—Heating using microwaves
    • H05B2206/044—Microwave heating devices provided with two or more magnetrons or microwave sources of other kind

Definitions

  • the invention relates to a device for coupling a microwave field into a microwave oven, in which the microwave field generated by at least one microwave transmitter reaches the cooking chamber of the oven via at least one waveguide, and in which a metallically closed resonator room is provided between the cooking chamber and the waveguide. to which the waveguide is connected and which is connected to the cooking space via coupling openings.
  • a device for coupling a microwave field into a microwave oven, in which the microwave field generated by at least one microwave transmitter reaches the cooking chamber of the oven via at least one waveguide, and in which a metallically closed resonator room is provided between the cooking chamber and the waveguide. to which the waveguide is connected and which is connected to the cooking space via coupling openings.
  • Such a device is known from publication DE-A-3028009. With such devices, the transition from the waveguide into the cooking chamber is particularly important. This transition largely determines the optimal field distribution in the cooking space. The aim here is to ensure that exactly the same heating takes place at every point in the cooking space.
  • a field distributor (propeller or rotating antenna), which is also installed, ensures that the entire microwave field is in motion, ie that it is forced due to the physical spread of the microwave in the cooking space, the hot and cold points that arise are shifted against each other and the heating is equally strong at every point.
  • Solutions are also known in which a box is built onto the cooking space, which is separated from the cooking space by a ceramic cover, possibly by a glass or plastic cover.
  • the waveguide is in each case blocked from the front of the box and the field distributor is usually mounted in this box, which is part of the cooking space with regard to the microwave field.
  • This object is achieved in that stationary coupling elements are arranged in the resonator space in order to also couple the voltage vector from the coupling direction (E z ) into the other two dimensions (E x , E y ).
  • the desired isotropic field distribution can thus be achieved even in the resonator space itself.
  • the resonator space is preferably separated from the cooking space by a metallic partition wall which has coupling openings whose dimensions are smaller than those of the partition wall and which are shaped such that the resulting voltage vectors of the microwave field are evenly coupled into the cooking space.
  • a movable field distributor is also advantageously arranged in the closed resonator chamber.
  • the intended resonator space decouples the cooking space from the microwave transmitter, which thus remains unaffected by the respective load in the cooking space and can thus be operated with optimum efficiency, with a uniform alignment of the resulting voltage vectors of the microwave field and thus uniform heating being achieved in the cooking space.
  • the microwave transmitter 1 shows a microwave transmitter 1 with a magnetron 4 which projects into a rectangular waveguide 2.
  • the magnetron 4 generates a microwave field in a known manner, which is fed via the waveguide 2 to a cooking chamber 3, which is designed to receive the food.
  • the rectangular waveguide 2 is dimensioned such that the resulting voltage vector E z of the microwave field in the waveguide is perpendicular to its broad side, as indicated in FIG. 2.
  • a thin, long, electrically poorly conductive rod held parallel to the above voltage vector in the waveguide, it absorbs energy, i.e. he warms up. If it is held perpendicular to the voltage vector in the waveguide, it does not absorb any energy because the extension of the rod in the direction of the voltage vector is too small.
  • the cooking space 3 forms a cavity in which, in conventional arrangements, a voltage vector prevails in the direction in which it is coupled in.
  • the waveguide 2 is connected to a resonator chamber 5 which is box-shaped. This is metallically sealed and connected to the cooking space 3 by coupling openings 6.
  • the coupling openings are arranged in a partition 8, which is common to the resonator chamber 5 and the cooking chamber 3.
  • the coupling openings 6, which are smaller in their dimensions than the partition 8, serve to effect the alignment of the microwave field in several directions. This can be done in several ways.
  • the slot-shaped design of the coupling openings 6 causes voltage vectors E x and E y to be coupled in, which are each perpendicular to the slot extension.
  • the coupling openings 6 can also have other shapes (round, square) and e.g. be arranged transversely in space 5 in order to influence the field in such a way that the most uniform possible distribution of microwave energy in all three dimensions is achieved in cooking space 3.
  • each coupling pin 9 is fastened to the edges of the upper cover surface of the resonator chamber 5 and project into the resonator chamber in the manner shown.
  • a movable field distributor 7 (propeller or rotary antenna) is arranged in the resonator chamber 5.
  • the multi-dimensionally distributed microwave field configured in the manner described is additionally moved in this way.
  • the field distributor 7 can also be arranged in the cooking space 3 itself.
  • FIG. 4 shows an appropriately designed coupling device, in which two transmitters 1.
  • the remaining parts, such as coupling elements and field distributors, are not shown in the drawing for the sake of simplicity.
  • the coupling resonator described can optionally be attached to the top or base surface of the cooking space or to one of its side surfaces.
  • the waveguide 2 opens in each case on one side 10 of the box-shaped resonator chamber 5, which abuts the partition 8 to the cooking chamber.
  • a coupling system is described with which, in addition to the better decoupling of the transmitter and the cooking space, there are also various possibilities for aligning the microwave field in all three dimensions before and during the coupling into the cooking space.
  • the field distributor also moves the microwave field in all three dimensions. This results in optimal heat distribution in the cooking space.

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

Claims (9)

  1. Dispositif pour coupler un champ de microondes dans un four à micro-ondes, le champ produit par au moins un émetteur à micro-ondes (1) étant transmis par au moins un guide d'ondes (2) jusqu'à l'enceinte de cuisson (3) du four, une chambre de résonance (5) fermée métalliquement étant prévue entre cette enceinte (3) et le guide d'ondes (2), cette chambre étant accouplée au guide d'ondes et connectée avec l'enceinte de cuisson (3) par l'intermédiaire d'ouvertures de couplage (6), caractérisé en ce que des éléments de couplage stationnaires (9) sont agencés dans la chambre de résonance (5) pour coupler le vecteur de tension hors de la direction de couplage d'entrée (Ez) en direction des deux autres dimensions (Ex, Ey).
  2. Dispositif selon la revendication 1, caractérisé en ce que deux barreaux de couplage (9) sont prévus comme éléments de couplage (9) et orientés approximativement à 45° de la direction de couplage, de manière à définir avec cette dernière deux plans mutuellement perpendiculaires.
  3. Dispositif selon une des revendications précédentes, caractérisé en ce que la chambre de résonance est séparée de l'enceinte de cuisson (3) par une paroi de séparation métallique (8) présentant au moins une ouverture de couplage (6) dont les dimensions sont inférieures à celles de la paroi de séparation.
  4. Dispositif selon la revendication 3, caractérisé en ce que les ouvertures de couplage (6) sont conformées de manière à ce que les vecteurs de tension du champ de micro-ondes résultant dans l'enceinte de cuisson soient régulièrement répartis dans cette enceinte.
  5. Dispositif selon une des revendications 2 à 4, caractérisé en ce que la chambre de résonance (5) est essentiellement en forme de caisson, le guide d'ondes débouchant dans une paroi (10) qui jouxte la paroi de séparation (8) et les barreaux de couplage (9) étant fixés dans le domaine de la paroi terminale opposée.
  6. Dispositif selon la revendication 5, caractérisé en ce que les barreaux d'accouplement sont fixés environ aux centres de deux côtés adjacents de la paroi terminale.
  7. Dispositif selon une des revendications précédentes, caractérisé en ce que la chambre de résonance close (5) contient un répartisseur de champ (7) mobile.
  8. Dispositif selon une des revendications précédentes, caractérisé en ce que l'enceinte de cuisson comporte un répartisseur de champ.
  9. Dispositif selon une des revendications précédentes, caractérisé en ce qu'il comporte plusieurs émetteurs (1, 1') de micro-ondes connectés par des guides d'ondes (2, 2') à la chambre de résonance (5).
EP19880104551 1987-03-24 1988-03-22 Dispositif de couplage d'un champ à micro-ondes à un four à micro-ondes Expired - Lifetime EP0284958B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1137/87 1987-03-24
CH113787A CH674563A5 (fr) 1987-03-24 1987-03-24

Publications (2)

Publication Number Publication Date
EP0284958A1 EP0284958A1 (fr) 1988-10-05
EP0284958B1 true EP0284958B1 (fr) 1992-06-03

Family

ID=4203355

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880104551 Expired - Lifetime EP0284958B1 (fr) 1987-03-24 1988-03-22 Dispositif de couplage d'un champ à micro-ondes à un four à micro-ondes

Country Status (3)

Country Link
EP (1) EP0284958B1 (fr)
CH (1) CH674563A5 (fr)
DE (1) DE3871587D1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2751055B1 (fr) * 1996-07-15 1998-09-25 Moulinex Sa Four electrique de cuisson
US6097018A (en) * 1998-04-06 2000-08-01 Lg Electronics Inc. Circular polarization generating system for microwave oven
PL3448121T3 (pl) 2017-08-23 2021-06-14 Vorwerk & Co. Interholding Gmbh Urządzenie zasilające mikrofalami w kuchence mikrofalowej

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1081987B (de) * 1959-05-16 1960-05-19 Philips Patentverwaltung Anordnung zur Einspeisung von Mikrowellenenergie in den Arbeitsraum einer dielektrischen Erwaermungsvorrichtung
SE375680B (fr) * 1973-08-17 1975-04-21 Philips Svenska Ab
DE3022235C2 (de) * 1980-06-13 1982-10-21 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Mikrowellenheizgerät
DE3028009A1 (de) * 1980-07-24 1982-02-18 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Mikrowellenheizgeraet

Also Published As

Publication number Publication date
EP0284958A1 (fr) 1988-10-05
CH674563A5 (fr) 1990-06-15
DE3871587D1 (de) 1992-07-09

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