EP1725076B1 - Electromagnetic waves supplying device of a cavity of a microwave oven - Google Patents

Electromagnetic waves supplying device of a cavity of a microwave oven Download PDF

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Publication number
EP1725076B1
EP1725076B1 EP06114061A EP06114061A EP1725076B1 EP 1725076 B1 EP1725076 B1 EP 1725076B1 EP 06114061 A EP06114061 A EP 06114061A EP 06114061 A EP06114061 A EP 06114061A EP 1725076 B1 EP1725076 B1 EP 1725076B1
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EP
European Patent Office
Prior art keywords
waveguide
cavity
microwave oven
oven according
ferrule
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EP06114061A
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German (de)
French (fr)
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EP1725076A1 (en
Inventor
Abdelaazziz Bouirdene
Serge Pruneau
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FagorBrandt SAS
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FagorBrandt SAS
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Priority to PL06114061T priority Critical patent/PL1725076T3/en
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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
    • H05B6/6402—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
    • H05B6/70—Feed lines
    • H05B6/707—Feed lines using waveguides

Definitions

  • the present invention relates to a microwave oven.
  • a microwave oven has a cavity for receiving food and a magnetron and a power circuit supplying the magnetron.
  • the waveguide is made of a material with good electrical conductivity such as aluminized or electrogalvanized sheets or austenitic stainless steel.
  • this principle requires that the cavity has connection areas of the walls of the angular cavity.
  • the means for fixing the waveguide on the shell of the cavity covers a large area since this fixing means is placed on the periphery of the waveguide to prevent leakage between the cavity and the waveguide.
  • the wall of the common cavity with the waveguide is not customizable depending on the microwave oven model without multiplying the number of oven cavity references.
  • the magnetron is on the wall opposite said common wall. Consequently, the magnetron occupies a large space on the side of the cavity.
  • This embodiment requires reducing the volume of the cavity for a built-in microwave oven.
  • the magnetron is disposed above the cavity.
  • This position of the magnetron requires that a side wall of the cavity is extended to allow assembly of the magnetron on said side wall so as to supply the waveguide with electromagnetic waves.
  • Another possibility is to add an additional piece between the waveguide and the cavity to allow the attachment of the magnetron and to close the waveguide. Said additional piece causes assembly difficulties.
  • a microwave oven described in the document DE2841176A1 .
  • This document discloses a microwave oven comprising a device for assembling a waveguide on one side by using screws longer than the depth of the waveguide when an angled waveguide is constructed by assembly.
  • the waveguide includes at least one hole in a wall of said waveguide for fixing a screw inserted through said at least one hole in a wall opposite.
  • the device described in this document is a waveguide intended to be mounted on the wall of a cavity between the antenna of a magnetron and an opening made in said wall and comprising a metal casing of tubular form formed of a cap comprising an elongated upper wall having a front region extending above the wall and a region extending above the magnetron, a base comprising a bottom wall through which a passage hole for the antenna.
  • the present invention aims to provide a microwave oven having a cavity with connection areas of the rounded walls.
  • the waveguide is a box in at least two independent parts and assembled to the oven cavity.
  • the magnetron adapts to the cavity by means of the waveguide cover customizable to each oven model and attached to the waveguide housing.
  • the invention proposes a microwave oven comprising a magnetron and a waveguide for supplying an oven cavity with electromagnetic waves comprising at least one opening in correspondence with at least one opening on a wall of the oven.
  • waveguide said openings forming at least one wave output adapted to couple the waveguide and the cavity, said cavity comprises a ferrule and a bottom wall, said ferrule is constituted by two lateral parts, a lower wall; and an upper wall.
  • the waveguide comprises a housing and a cover whose means for closing the waveguide is independent of the means for fixing the waveguide on the shell of the cavity.
  • the waveguide is made independently of the cavity to optimize the coupling of these two parts of the oven.
  • the oven cavity can be used for cooking only by magnetic waves or in combination with a heating element in the cavity.
  • the adaptation of the waveguide to the cavity is simplified in the case of the use of steps in the cavity. This adaptation is allowed by the closing means of the waveguide independent of the waveguide fixing means on the shell of the cavity where the cover closing the waveguide housing is customizable to each cooking appliance.
  • the means for fixing the waveguide on the shell of the cavity is formed around each wave output.
  • the zone for fixing the waveguide on the shell of the cavity is minimized, minimizes the risk of wave leakage between the cavity and the waveguide and simplifies the assembly. This reduces the manufacturing costs of assembly.
  • microwave energy is used in the microwave oven 1 by generation means which may comprise a magnetron 4.
  • Said magnetron 4 is intended to radiate an electromagnetic field in the waveguide 3 which is connected to the cavity 2 via wave outputs.
  • This magnetron 4 is placed relative to the waveguide 3 to allow good adaptation of the microwaves in said cavity 2. The positioning of said magnetron 4 is not the subject of the present invention is not described here.
  • the microwave oven 1 comprises a magnetron 4 and a waveguide 3 for supplying an electromagnetic wave cavity 2 of an oven comprising at least one opening 8 in correspondence with at least one opening 6 formed on a wall 7 of the waveguide 3, said openings 6 and 8 forming at least one wave output adapted to couple the waveguide 3 and the cavity 2, said cavity 2 comprises a ferrule 9 and a bottom wall 10, said ferrule 9 consists of two lateral parts 11, a bottom wall 12 and an upper wall 13.
  • the walls 10, 11, 12 and 13 of the cavity 2 are made of a metallic material which is impermeable to microwave energy. In this way, said material makes it possible to prevent the microwaves from coming out of the cavity 2.
  • the walls 10, 11, 12 and 13 of the cavity 2 are tightly assembled to prevent leakage by the connections between said walls of the cavity 2.
  • the cavity 2 whose front face 30 is closed by a door (not shown), through which the food is introduced into the cavity 2, has usual sealing means for microwaves.
  • the waveguide 3 comprises means for adapting the impedance to adapt the impedance of the cavity 2 and the microwave generator to know the magnetron 4.
  • the waveguide 3 is intended to be mounted on a side wall 11 of the cavity 2 of a microwave oven 1.
  • This waveguide 3 is mounted on a side wall 11 and said waveguide 3 is closed without using a portion of the side wall 11 of the cavity 2.
  • the waveguide 3 is made independently of the cavity 2 to optimize the coupling of these two parts 2 and 3 of the oven 1. This allows to manage a single cavity reference 2 according to the use of the oven 2.
  • the cavity 2 of the oven 1 may be identical for cooking only by electromagnetic waves or in combination with a heating element (not shown).
  • the adaptation of the waveguide 3 to the cavity 2 is simplified in the case of the use of other elements such as steps or heating elements in the cavity 2.
  • This adaptation is allowed by the means of closure of the waveguide 3 independent of the fixing means 17 of the waveguide 3 on the shell 9 of the cavity 2 where the lid 15 closing the housing 14 of the waveguide 3 is customizable to each cooking appliance.
  • the waveguide 3 comprises at least two openings 5 and 6, one of said two openings is an inlet opening 5 allowing the introduction of the antenna 26 of the magnetron 4 in the waveguide 3 and the other of said two openings is at least one outlet opening 6 for coupling the waveguide 3 to the cavity 2.
  • the waveguide 3 is assembled on the cavity 2 so that the at least one outlet opening 6 is aligned with at least one inlet opening 8 formed in the side wall 11 of the cavity 2 to define at least one wave output.
  • the wave circuit is closed for the transmission of the microwave energy of the antenna 26 of the magnetron 4 successively passing through the waveguide 3 and said at least one outlet opening 6 of the guide wave 3 aligned with said at least one inlet opening 8 of the cavity 2.
  • This waveguide 3 is formed of a casing 14 and a cover 15 cooperating together to define a duct for delivering microwave energy from the magnetron 4 through an outlet wound in the side wall 11. of the cavity 2 of the oven 1.
  • the waveguide 3 comprises a housing 14 and a cover 15 whose closure means of the waveguide 3 is independent of the fixing means 17 of the waveguide 3 on the shell 9 of the cavity 2.
  • positioning means 29 are arranged on said housing 14 and cover 15.
  • the casing 14 of the waveguide 3 is generally tubular in shape with a substantially rectangular cross-section.
  • the housing 14 is formed in one piece obtained by plastic deformation, such as by a stamping process.
  • the housing 14 comprises a bottom wall 7, side walls 27 of which said side walls 27 carry a folded edge 28 having attachment means (not shown) with said cover 15 of the waveguide 3.
  • the housing 14 and the lid 15 are assembled by welding or clinching thereby preventing any leakage of microwaves.
  • the waveguide 3 extends above the upper wall 13 of the cavity 2 allowing the magnetron 4 to be assembled above the cavity 2.
  • the magnetron 4 is mounted on a mounting flange 16 fitted to the waveguide 3.
  • the fixing means 17 of the waveguide 3 on the shell 9 of the cavity 2 is formed around each wave output.
  • the fixing means 17 of the waveguide 3 on the shell 9 of the cavity 2 is preferably made by welding or clinching.
  • the magnetron 4 is oriented such that the antenna 26 is perpendicular to the plane passing through the wave output.
  • the magnetron 4 according to the invention can be mounted on the waveguide 3 at locations other than above the cavity 2, according to the applications envisaged by those skilled in the art.
  • the points of the fixing means 17 by welding the waveguide 3 to the shell 9 of the cavity 2 are represented on the figure 3 .
  • the distance between the fixing means 17 of the waveguide 3 on the shell 9 of the cavity 2 and the wave output extends in a range between 2 and 10 mm.
  • the distance between the fixing means 17 of the waveguide 3 on the shell 9 of the cavity 2 and the wave output is of the order of 4 mm.
  • the shell 9 of the cavity 2 comprises connecting regions 19 of the walls 11, 12 and 13 of the shell 9 of rounded shape, so as to make the visual appearance of the microwave oven aesthetic and easier to clean.
  • the waveguide 3 comprises impedance matching means for adapting the impedance of the cavity 2 and the wave outputs to the impedance of the magnetron 4.
  • a preferred embodiment of the waveguide 3 according to the invention comprises at least one stub 20.
  • Said means for adapting the impedance of the waveguide 3 are arranged in order to optimize the power and the efficiency of the means for generating microwave energy.
  • the cover 15 of the waveguide 3 makes it possible to adapt the waveguide 3 to the magnetron 4 by allowing a simple modification of the waveguide 3.
  • the cover 15 of the waveguide 3 comprises at least one stub 20.
  • the cover 15 of the waveguide 3 comprises a stamp 25 directed towards the outside of the waveguide 3 placed in front of a magnetron antenna 26 4 to respect the distance between the antenna 26 of the magnetron 4 and the cover 15 of the waveguide 3 without increasing the depth of the casing 14 of the waveguide 3.
  • each wave output corresponds a mode of excitation of the cavity 2 and a field orientation clean.
  • the two wave outputs couple the waveguide 3 to the cavity 2.
  • the wave outputs are positioned in the waveguide 3 and the cavity 2 so that the current lines generated by the microwave fields on the wall 11 of the cavity 2 and on the waveguide 3 are cut perpendicularly by said wave outputs and in turn generate electromagnetic fields in the cavity 2.
  • the waveguide 3 in the case described is a waveguide in TE01 mode.
  • the wave outputs may have at least U and L shapes.
  • the shape of said wave outputs is related to the shape of the casing 14 comprising connecting radii of large size between the wall 7 and the side walls 27 of the waveguide 3. In order not to enlarge the width of the casing 14, the Wave outputs are made with bent shapes.
  • the L shape of at least one wave output is preferably made so that the largest branch of L is horizontal.
  • Said at least one wave output comprises an opening 8 in the cavity 2 greater than an opening 6 in the waveguide 3.
  • a cover covers at least one wave output and the fixing means 17 of the waveguide 3 on the cavity 2 of said wave output.
  • This cover covers at least one wave output so as to protect said wave output.
  • This cover may for example be a mica sheet or a material transparent to microwaves.
  • a wall 11 of the shell 9 comprises a stamping 18 for the positioning of the cover so that said cover is in the extension of said wall 11.
  • Said cover is of dimension to be inserted in the stamping 18 so as not to protrude from the side wall 11 of the cavity 2.
  • the ferrule 9 of the cavity 2 comprises at least a lower portion 23 and an upper portion 24 connected by a fixing means.
  • the waveguide 3 comprises a stamped shape 25 making it possible to bypass said fastening means of the lower part 23 with the upper part 24 of the ferrule 9.
  • the waveguide 3 is mounted upside down with respect to the waveguides 3 of the microwave ovens 1 known to those skilled in the art.
  • This principle of construction makes it possible to assemble the waveguide 3 to the cavity 2 before closing the casing 14 by the cover 15. Hence the possibility of fixing around the openings 6 of the waveguide 3 in a reduced and limited area.
  • the construction of the waveguide 3 and the assembly on the cavity 2 of the present invention is simple and economical while ensuring compliance with dimensional tolerances and other requirements.
  • the main object of the present invention is to provide a construction of the waveguide of great flexibility for the connection of the waveguide to the cavity and for the adaptation of the cavity to the magnetron.

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

Abstract

The oven (1) has a magnetron (4) to radiate an electromagnetic field in a wave guide (3) which is connected to a cavity (2) of the oven (1) through a wave outlet. The cavity has an opening (8) corresponding to opening (6) arranged on a wall (7) of the waveguide. The cavity has a base wall (10) and a shell (9) which has two lateral walls (11), a lower wall (12) and an upper wall (13). The wave guide has a case (14) and a cover (15), where the guide has a covering unit independent of a fixation unit of the guide.

Description

La présente invention concerne un four à micro-ondes.The present invention relates to a microwave oven.

Un four à micro-ondes comporte une cavité destinée à recevoir des aliments ainsi qu'un magnétron et un circuit de puissance alimentant le magnétron.A microwave oven has a cavity for receiving food and a magnetron and a power circuit supplying the magnetron.

Pour éviter des pertes métalliques, le guide d'ondes est réalisé dans une matière à bonne conductivité électrique tel que les tôles aluminées ou électrozinguées ou inox austénitique.To avoid metal losses, the waveguide is made of a material with good electrical conductivity such as aluminized or electrogalvanized sheets or austenitic stainless steel.

Une solution répandue pour pallier les difficultés de construction du guide d'ondes est l'utilisation d'une paroi de la cavité commune avec le guide d'ondes. Ce principe de construction impose de réaliser la cavité du four micro-ondes dans la même matière que le guide d'ondes. Par conséquent, un surcoût est généré pour la fabrication de tels fours.A widespread solution to overcome the difficulties of construction of the waveguide is the use of a wall of the common cavity with the waveguide. This principle of construction requires the cavity of the microwave oven to be made in the same material as the waveguide. Therefore, an additional cost is generated for the manufacture of such ovens.

En outre, ce principe nécessite que la cavité comporte des zones de raccordement des parois de la cavité anguleuses. Le moyen de fixation du guide d'ondes sur la virole de la cavité recouvre une zone importante puisque ce moyen de fixation est mis en place sur la périphérie du guide d'ondes pour éviter les fuites entre la cavité et le guide d'ondes.In addition, this principle requires that the cavity has connection areas of the walls of the angular cavity. The means for fixing the waveguide on the shell of the cavity covers a large area since this fixing means is placed on the periphery of the waveguide to prevent leakage between the cavity and the waveguide.

En particulier, la paroi de la cavité commune avec le guide d'ondes n'est pas personnalisable en fonction du modèle de four à micro-ondes sans multiplier le nombre de références de cavité de four.In particular, the wall of the common cavity with the waveguide is not customizable depending on the microwave oven model without multiplying the number of oven cavity references.

Dans un four à micro-ondes où une paroi de la cavité est commune au guide d'ondes, deux configurations d'assemblage du magnétron sur le guide d'ondes se présentent.In a microwave oven where a wall of the cavity is common to the waveguide, two configurations of assembly of the magnetron on the waveguide occur.

Dans une première configuration, le magnétron est sur la paroi opposée à ladite paroi commune. Par conséquent, le magnétron occupe un encombrement important sur le côté de la cavité. Ce mode de réalisation nécessite de réduire le volume de la cavité pour un four micro-ondes encastrable.In a first configuration, the magnetron is on the wall opposite said common wall. Consequently, the magnetron occupies a large space on the side of the cavity. This embodiment requires reducing the volume of the cavity for a built-in microwave oven.

Dans une seconde configuration, le magnétron est disposé au-dessus de la cavité. Cette position du magnétron nécessite qu'une paroi latérale de la cavité se prolonge pour permettre l'assemblage du magnétron sur ladite paroi latérale de manière à alimenter le guide d'ondes en ondes électromagnétiques. Une autre possibilité est de rajouter une pièce supplémentaire entre le guide d'ondes et la cavité pour permettre la fixation du magnétron et permettant de fermer le guide d'ondes. Ladite pièce supplémentaire engendre des difficultés d'assemblage.In a second configuration, the magnetron is disposed above the cavity. This position of the magnetron requires that a side wall of the cavity is extended to allow assembly of the magnetron on said side wall so as to supply the waveguide with electromagnetic waves. Another possibility is to add an additional piece between the waveguide and the cavity to allow the attachment of the magnetron and to close the waveguide. Said additional piece causes assembly difficulties.

On connaît également un four à micro-ondes décrit dans le document DE2841176A1 . Ce document présente un four à micro-ondes comprenant un dispositif permettant d'assembler un guide d'ondes sur un côté par l'utilisation de vis plus longues que la profondeur du guide d'ondes quand un guide d'ondes coudé est construit par assemblage. Le guide d'ondes comprend au moins un trou dans une paroi dudit guide d'ondes pour la fixation d'une vis insérée au travers dudit au moins un trou dans une paroi opposée.Also known is a microwave oven described in the document DE2841176A1 . This document discloses a microwave oven comprising a device for assembling a waveguide on one side by using screws longer than the depth of the waveguide when an angled waveguide is constructed by assembly. The waveguide includes at least one hole in a wall of said waveguide for fixing a screw inserted through said at least one hole in a wall opposite.

On connaît également un four à micro-ondes décrit dans le document US5329086A . Le dispositif décrit dans ce document est un guide d'ondes destiné à être monté sur la paroi d'une cavité entre l'antenne d'un magnétron et une ouverture pratiquée dans ladite paroi et comportant un boîtier métallique de forme tubulaire formé d'un chapeau comprenant une paroi supérieure allongée dont une région antérieure s'étend au-dessus de la paroi et dont une région s'étend au-dessus du magnétron, une embase comprenant une paroi de fond traversée par un trou de passage pour l'antenne.Also known is a microwave oven described in the document US5329086A . The device described in this document is a waveguide intended to be mounted on the wall of a cavity between the antenna of a magnetron and an opening made in said wall and comprising a metal casing of tubular form formed of a cap comprising an elongated upper wall having a front region extending above the wall and a region extending above the magnetron, a base comprising a bottom wall through which a passage hole for the antenna.

La présente invention a pour but de fournir un four à micro-ondes comportant une cavité avec des zones de raccordement des parois arrondies. Le guide d'ondes est une boîte en au moins deux parties indépendantes et assemblé à la cavité de four. L'adaptation du magnétron à la cavité s'effectue par le couvercle du guide d'ondes personnalisable à chaque modèle de four et se fixant sur le boîtier du guide d'ondes.The present invention aims to provide a microwave oven having a cavity with connection areas of the rounded walls. The waveguide is a box in at least two independent parts and assembled to the oven cavity. The magnetron adapts to the cavity by means of the waveguide cover customizable to each oven model and attached to the waveguide housing.

A cet effet, l'invention propose un four à micro-ondes comprenant un magnétron et un guide d'ondes destinés à alimenter en ondes électromagnétiques une cavité de four comprenant au moins une ouverture en correspondance avec au moins une ouverture ménagée sur une paroi du guide d'ondes, lesdites ouvertures formant au moins une sortie d'ondes adaptée à coupler le guide d'ondes et la cavité, ladite cavité comprend une virole et une paroi de fond, ladite virole est constituée de deux parties latérales, une paroi inférieure et une paroi supérieure.To this end, the invention proposes a microwave oven comprising a magnetron and a waveguide for supplying an oven cavity with electromagnetic waves comprising at least one opening in correspondence with at least one opening on a wall of the oven. waveguide, said openings forming at least one wave output adapted to couple the waveguide and the cavity, said cavity comprises a ferrule and a bottom wall, said ferrule is constituted by two lateral parts, a lower wall; and an upper wall.

Selon l'invention, le guide d'ondes comprend un boîtier et un couvercle dont lé moyen de fermeture du guide d'ondes est indépendant du moyen de fixation du guide d'ondes sur la virole de la cavité.According to the invention, the waveguide comprises a housing and a cover whose means for closing the waveguide is independent of the means for fixing the waveguide on the shell of the cavity.

De cette manière, le guide d'ondes est réalisé de manière indépendante de la cavité pour optimiser le couplage des ces deux parties du four. Ceci permet de gérer une référence unique de cavité suivant le type de four. La cavité de four peut être utilisée pour une cuisson uniquement par ondes magnétiques ou en combiné avec un élément chauffant dans la cavité. De même, l'adaptation du guide d'ondes à la cavité est simplifiée dans le cas de l'utilisation de gradins dans la cavité. Cette adaptation est permise par le moyen de fermeture du guide d'ondes indépendant du moyen de fixation du guide d'ondes sur la virole de la cavité où le couvercle fermant le boîtier du guide d'ondes est personnalisable à chaque appareil de cuisson.In this way, the waveguide is made independently of the cavity to optimize the coupling of these two parts of the oven. This makes it possible to manage a unique cavity reference according to the type of furnace. The oven cavity can be used for cooking only by magnetic waves or in combination with a heating element in the cavity. Similarly, the adaptation of the waveguide to the cavity is simplified in the case of the use of steps in the cavity. This adaptation is allowed by the closing means of the waveguide independent of the waveguide fixing means on the shell of the cavity where the cover closing the waveguide housing is customizable to each cooking appliance.

Selon un mode de réalisation de l'invention, le moyen de fixation du guide d'ondes sur la virole de la cavité est réalisé autour de chaque sortie d'ondes.According to one embodiment of the invention, the means for fixing the waveguide on the shell of the cavity is formed around each wave output.

Ainsi, la zone de fixation du guide d'ondes sur la virole de la cavité est réduite au minimum, permet de minimiser le risque de fuites d'ondes entre la cavité et le guide d'ondes et de simplifier l'assemblage. Ceci permet de réduire les coûts de fabrication de de l'assemblage.Thus, the zone for fixing the waveguide on the shell of the cavity is minimized, minimizes the risk of wave leakage between the cavity and the waveguide and simplifies the assembly. This reduces the manufacturing costs of assembly.

D'autres particularités et avantages de l'invention apparaîtront encore dans la description ci-après.Other features and advantages of the invention will become apparent in the description below.

Aux dessins annexés, donnés à titre d'exemples non limitatifs:

  • la figure 1 est une vue en perspective d'un four à micro-ondes conforme à l'invention ;
  • la figure 2 est une vue éclatée d'un four à micro-ondes conforme à l'invention ;
  • la figure 3 est une vue en perspective d'un guide d'ondes ouvert conforme à l'invention ; et
  • la figure 4 est une vue de face d'un guide d'ondes conforme à l'invention ;
In the accompanying drawings, given as non-limiting examples:
  • the figure 1 is a perspective view of a microwave oven according to the invention;
  • the figure 2 is an exploded view of a microwave oven according to the invention;
  • the figure 3 is a perspective view of an open waveguide according to the invention; and
  • the figure 4 is a front view of a waveguide according to the invention;

On va décrire tout d'abord, en référence aux figures 1 et 2, un four à micro-ondes 1 conforme à l'invention.We will first describe, with reference to figures 1 and 2 , a microwave oven 1 according to the invention.

On reconnaît sur ces figures une cavité de cuisson des aliments 2 et un guide d'ondes 3. L'énergie micro-ondes est mise en oeuvre dans le four à micro-ondes 1 par des moyens de génération qui peuvent comprendre un magnétron 4.These figures show a food cooking cavity 2 and a waveguide 3. The microwave energy is used in the microwave oven 1 by generation means which may comprise a magnetron 4.

Ledit magnétron 4 est destiné à rayonner un champ électromagnétique dans le guide d'ondes 3 qui est lié à la cavité 2 via des sorties d'ondes. Ce magnétron 4 est placé par rapport au guide d'ondes 3 pour permettre une bonne adaptation des micro-ondes dans ladite cavité 2. Le positionnement dudit magnétron 4 n'étant pas l'objet de la présente invention n'est pas décrit ici.Said magnetron 4 is intended to radiate an electromagnetic field in the waveguide 3 which is connected to the cavity 2 via wave outputs. This magnetron 4 is placed relative to the waveguide 3 to allow good adaptation of the microwaves in said cavity 2. The positioning of said magnetron 4 is not the subject of the present invention is not described here.

Comme illustré aux figures 1 et 2, le four à micro-ondes 1 comprend un magnétron 4 et un guide d'ondes 3 destinés à alimenter en ondes électromagnétiques une cavité 2 de four comprenant au moins une ouverture 8 en correspondance avec au moins une ouverture 6 ménagée sur une paroi 7 du guide d'ondes 3, lesdites ouvertures 6 et 8 formant au moins une sortie d'ondes adaptée à coupler le guide d'ondes 3 et la cavité 2, ladite cavité 2 comprend une virole 9 et une paroi de fond 10, ladite virole 9 est constituée de deux parties latérales 11, une paroi inférieure 12 et une paroi supérieure 13.As illustrated in figures 1 and 2 , the microwave oven 1 comprises a magnetron 4 and a waveguide 3 for supplying an electromagnetic wave cavity 2 of an oven comprising at least one opening 8 in correspondence with at least one opening 6 formed on a wall 7 of the waveguide 3, said openings 6 and 8 forming at least one wave output adapted to couple the waveguide 3 and the cavity 2, said cavity 2 comprises a ferrule 9 and a bottom wall 10, said ferrule 9 consists of two lateral parts 11, a bottom wall 12 and an upper wall 13.

Les parois 10, 11, 12 et 13 de la cavité 2 sont réalisées dans un matériau métallique qui est imperméable à l'énergie micro-ondes. De cette façon, ledit matériau permet d'empêcher les de micro-ondes de sortir de la cavité 2.The walls 10, 11, 12 and 13 of the cavity 2 are made of a metallic material which is impermeable to microwave energy. In this way, said material makes it possible to prevent the microwaves from coming out of the cavity 2.

De plus, les parois 10, 11, 12 et 13 de la cavité 2 sont assemblées de manière étanche pour éviter les fuites par les liaisons entre lesdites parois de la cavité 2.In addition, the walls 10, 11, 12 and 13 of the cavity 2 are tightly assembled to prevent leakage by the connections between said walls of the cavity 2.

En outre, la cavité 2 dont la face frontale 30 est fermée par une porte (non représentée), par laquelle les aliments sont introduits dans la cavité 2, présente des moyens d'étanchéité habituels aux micro-ondes.In addition, the cavity 2 whose front face 30 is closed by a door (not shown), through which the food is introduced into the cavity 2, has usual sealing means for microwaves.

Selon l'invention, le guide d'ondes 3 comprend des moyens d'adaptation de l'impédance pour adapter l'impédance de la cavité 2 et du générateur de micro-ondes à savoir le magnétron 4.According to the invention, the waveguide 3 comprises means for adapting the impedance to adapt the impedance of the cavity 2 and the microwave generator to know the magnetron 4.

Le guide d'ondes 3 est destiné à être monté sur une paroi latérale 11 de la cavité 2 d'un four à micro-ondes 1.The waveguide 3 is intended to be mounted on a side wall 11 of the cavity 2 of a microwave oven 1.

Ce guide d'ondes 3 est monté sur une paroi latérale 11 et ledit guide d'ondes 3 est fermé sans utiliser une partie de la paroi latérale 11 de la cavité 2.This waveguide 3 is mounted on a side wall 11 and said waveguide 3 is closed without using a portion of the side wall 11 of the cavity 2.

De cette manière, le guide d'ondes 3 est réalisé de manière indépendante de la cavité 2 pour optimiser le couplage des ces deux parties 2 et 3 du four 1. Ceci permet de gérer une référence unique de cavité 2 suivant l'utilisation du four 2. La cavité 2 de four 1 peut être identique pour une cuisson uniquement par ondes électromagnétiques ou en combiné avec un élément chauffant (non représenté).In this way, the waveguide 3 is made independently of the cavity 2 to optimize the coupling of these two parts 2 and 3 of the oven 1. This allows to manage a single cavity reference 2 according to the use of the oven 2. The cavity 2 of the oven 1 may be identical for cooking only by electromagnetic waves or in combination with a heating element (not shown).

De même, l'adaptation du guide d'ondes 3 à la cavité 2 est simplifiée dans le cas de l'utilisation d'autres éléments tels que des gradins ou des éléments chauffants dans la cavité 2. Cette adaptation est permise par le moyen de fermeture du guide d'ondes 3 indépendant du moyen de fixation 17 du guide d'ondes 3 sur la virole 9 de la cavité 2 où le couvercle 15 fermant le boîtier 14 du guide d'ondes 3 est personnalisable à chaque appareil de cuisson.Similarly, the adaptation of the waveguide 3 to the cavity 2 is simplified in the case of the use of other elements such as steps or heating elements in the cavity 2. This adaptation is allowed by the means of closure of the waveguide 3 independent of the fixing means 17 of the waveguide 3 on the shell 9 of the cavity 2 where the lid 15 closing the housing 14 of the waveguide 3 is customizable to each cooking appliance.

Le guide d'ondes 3 comprend au moins deux ouvertures 5 et 6 dont l'une desdites deux ouvertures est une ouverture d'entrée 5 permettant l'introduction de l'antenne 26 du magnétron 4 dans le guide d'ondes 3 et l'autre desdites deux ouvertures est au moins une ouverture de sortie 6 permettant de coupler le guide d'ondes 3 à la cavité 2.The waveguide 3 comprises at least two openings 5 and 6, one of said two openings is an inlet opening 5 allowing the introduction of the antenna 26 of the magnetron 4 in the waveguide 3 and the other of said two openings is at least one outlet opening 6 for coupling the waveguide 3 to the cavity 2.

Le guide d'ondes 3 est assemblé sur la cavité 2 de manière à ce que ladite au moins ouverture de sortie 6 est alignée avec au moins une ouverture d'entrée 8 ménagée dans la paroi latérale 11 de la cavité 2 pour définir au moins une sortie d'ondes.The waveguide 3 is assembled on the cavity 2 so that the at least one outlet opening 6 is aligned with at least one inlet opening 8 formed in the side wall 11 of the cavity 2 to define at least one wave output.

De cette manière, le circuit d'ondes est fermé pour l'acheminement de l'énergie micro-ondes de l'antenne 26 du magnétron 4 traversant successivement le guide d'ondes 3 et ladite au moins ouverture de sortie 6 du guide d'ondes 3 alignée avec ladite au moins ouverture d'entrée 8 de la cavité 2.In this way, the wave circuit is closed for the transmission of the microwave energy of the antenna 26 of the magnetron 4 successively passing through the waveguide 3 and said at least one outlet opening 6 of the guide wave 3 aligned with said at least one inlet opening 8 of the cavity 2.

Ce guide d'ondes 3 est formé d'un boîtier 14 et d'un couvercle 15 coopérant ensemble pour définir un conduit pour délivrer une énergie par micro-ondes du magnétron 4 au travers d'une sortie s'ondes dans la paroi latérale 11 de la cavité 2 du four 1.This waveguide 3 is formed of a casing 14 and a cover 15 cooperating together to define a duct for delivering microwave energy from the magnetron 4 through an outlet wound in the side wall 11. of the cavity 2 of the oven 1.

Le guide d'ondes 3 comprend un boîtier 14 et un couvercle 15 dont le moyen de fermeture du guide d'ondes 3 est indépendant du moyen de fixation 17 du guide d'ondes 3 sur la virole 9 de la cavité 2.The waveguide 3 comprises a housing 14 and a cover 15 whose closure means of the waveguide 3 is independent of the fixing means 17 of the waveguide 3 on the shell 9 of the cavity 2.

Pour garantir l'alignement du boîtier 14 et du couvercle 15 lors de l'assemblage, des moyens de positionnement 29 sont disposés sur lesdits boîtier 14 et couvercle 15.To ensure the alignment of the housing 14 and the cover 15 during assembly, positioning means 29 are arranged on said housing 14 and cover 15.

Le boîtier 14 du guide d'ondes 3 est de forme générale tubulaire à section transversale sensiblement rectangulaire.The casing 14 of the waveguide 3 is generally tubular in shape with a substantially rectangular cross-section.

Selon l'invention, le boîtier 14 est formé en une seule pièce obtenue par déformation plastique, tel que par un procédé d'emboutissage.According to the invention, the housing 14 is formed in one piece obtained by plastic deformation, such as by a stamping process.

Comme montré aux figures 3 et 4, le boîtier 14 comprend une paroi de fond 7, des parois latérales 27dont lesdites parois latérales 27 portent un bord plié 28 comportant des moyens de fixation (non représentés) avec ledit couvercle 15 du guide d'ondes 3.As shown in figures 3 and 4 the housing 14 comprises a bottom wall 7, side walls 27 of which said side walls 27 carry a folded edge 28 having attachment means (not shown) with said cover 15 of the waveguide 3.

Le boîtier 14 et le couvercle 15 sont assemblés par soudage ou clinchage empêchant ainsi toute fuite de micro-ondes.The housing 14 and the lid 15 are assembled by welding or clinching thereby preventing any leakage of microwaves.

Dans ce mode de réalisation, le guide d'ondes 3 s'étend au-dessus de la paroi supérieure 13 de la cavité 2 permettant l'assemblage du magnétron 4 au-dessus de la cavité 2.In this embodiment, the waveguide 3 extends above the upper wall 13 of the cavity 2 allowing the magnetron 4 to be assembled above the cavity 2.

Comme montré à la figure 1, dans cette forme de réalisation préférée, le magnétron 4 est monté sur une bride de montage 16 équipant le guide d'ondes 3.As shown in figure 1 in this preferred embodiment, the magnetron 4 is mounted on a mounting flange 16 fitted to the waveguide 3.

Conformément à l'invention, le moyen de fixation 17 du guide d'ondes 3 sur la virole 9 de la cavité 2 est réalisé autour de chaque sortie d'ondes.According to the invention, the fixing means 17 of the waveguide 3 on the shell 9 of the cavity 2 is formed around each wave output.

Selon l'invention, le moyen de fixation 17 du guide d'ondes 3 sur la virole 9 de la cavité 2 est réalisé préférentiellement par soudage ou clinchage.According to the invention, the fixing means 17 of the waveguide 3 on the shell 9 of the cavity 2 is preferably made by welding or clinching.

De préférence, le magnétron 4 est orienté de telle manière que l'antenne 26 est perpendiculaire au plan passant par la sortie d'ondes.Preferably, the magnetron 4 is oriented such that the antenna 26 is perpendicular to the plane passing through the wave output.

Bien entendu, le magnétron 4 selon l'invention peut être monté sur le guide d'ondes 3 à des emplacements autres qu'au-dessus de la cavité 2, selon les applications envisagées par l'homme du métier.Of course, the magnetron 4 according to the invention can be mounted on the waveguide 3 at locations other than above the cavity 2, according to the applications envisaged by those skilled in the art.

Les points du moyen de fixation 17 par soudage du guide d'ondes 3 sur la virole 9 de la cavité 2 sont représentés sur la figure 3.The points of the fixing means 17 by welding the waveguide 3 to the shell 9 of the cavity 2 are represented on the figure 3 .

La distance entre le moyen de fixation 17 du guide d'ondes 3 sur la virole 9 de la cavité 2 et la sortie d'ondes s'étend dans une plage comprise entre 2 et 10mm.The distance between the fixing means 17 of the waveguide 3 on the shell 9 of the cavity 2 and the wave output extends in a range between 2 and 10 mm.

Préférentiellement, la distance entre le moyen de fixation 17 du guide d'ondes 3 sur la virole 9 de la cavité 2 et la sortie d'ondes est de l'ordre de 4mm.Preferably, the distance between the fixing means 17 of the waveguide 3 on the shell 9 of the cavity 2 and the wave output is of the order of 4 mm.

Comme cela apparaît particulièrement à la figure 1, la virole 9 de la cavité 2 comprend des zones de raccordement 19 des parois 11, 12 et 13 de la virole 9 de forme arrondie, de manière à rendre l'aspect visuel du four à micro-ondes esthétique et plus facile à nettoyer.As appears particularly in figure 1 , the shell 9 of the cavity 2 comprises connecting regions 19 of the walls 11, 12 and 13 of the shell 9 of rounded shape, so as to make the visual appearance of the microwave oven aesthetic and easier to clean.

Selon l'invention, le guide d'ondes 3 comprend des moyens d'adaptation de l'impédance pour adapter l'impédance de la cavité 2 et les sorties d'ondes à l'impédance du magnétron 4.According to the invention, the waveguide 3 comprises impedance matching means for adapting the impedance of the cavity 2 and the wave outputs to the impedance of the magnetron 4.

En référence aux figures 3 et 4, une forme de réalisation préférée du guide d'ondes 3 selon l'invention comprend au moins un stub 20.With reference to figures 3 and 4 a preferred embodiment of the waveguide 3 according to the invention comprises at least one stub 20.

Lesdits moyens d'adaptation de l'impédance du guide d'ondes 3 sont agencés de manière à optimiser la puissance et l'efficacité des moyens de génération de l'énergie micro-ondes.Said means for adapting the impedance of the waveguide 3 are arranged in order to optimize the power and the efficiency of the means for generating microwave energy.

Le couvercle 15 du guide d'ondes 3 permet d'adapter le guide d'ondes 3 au magnétron 4 en permettant une modification simple du guide d'ondes 3.The cover 15 of the waveguide 3 makes it possible to adapt the waveguide 3 to the magnetron 4 by allowing a simple modification of the waveguide 3.

Le couvercle 15 du guide d'ondes 3 comprend au moins un stub 20.The cover 15 of the waveguide 3 comprises at least one stub 20.

Le couvercle 15 du guide d'ondes 3 comprend un embouti 25 orienté vers l'extérieur du guide d'ondes 3 disposé en face d'une antenne 26 de magnétron 4 pour respecter la distance entre l'antenne 26 du magnétron 4 et le couvercle 15 du guide d'ondes 3 sans augmenter la profondeur du boîtier 14 du guide d'ondes 3.The cover 15 of the waveguide 3 comprises a stamp 25 directed towards the outside of the waveguide 3 placed in front of a magnetron antenna 26 4 to respect the distance between the antenna 26 of the magnetron 4 and the cover 15 of the waveguide 3 without increasing the depth of the casing 14 of the waveguide 3.

Pour améliorer l'homogénéité du champ électromagnétique dans la cavité 2, il est préférentiel de disposer de deux sorties d'ondes dans la cavité 2. A chaque sortie d'ondes correspond un mode d'excitation de la cavité 2 et une orientation de champ propre.To improve the homogeneity of the electromagnetic field in the cavity 2, it is preferable to have two wave outputs in the cavity 2. At each wave output corresponds a mode of excitation of the cavity 2 and a field orientation clean.

Les deux sorties d'ondes couplent le guide d'ondes 3 à la cavité 2.The two wave outputs couple the waveguide 3 to the cavity 2.

Dans ce mode de réalisation, les sorties d'ondes sont positionnées dans le guide d'ondes 3 et la cavité 2 de telle sorte que les lignes de courant générées par les champs micro-ondes sur la paroi 11 de la cavité 2 et sur le guide d'ondes 3 sont coupées perpendiculairement par lesdites sorties d'ondes et génèrent à leur tour des champs électromagnétiques dans la cavité 2.In this embodiment, the wave outputs are positioned in the waveguide 3 and the cavity 2 so that the current lines generated by the microwave fields on the wall 11 of the cavity 2 and on the waveguide 3 are cut perpendicularly by said wave outputs and in turn generate electromagnetic fields in the cavity 2.

Le guide d'ondes 3 dans le cas décrit est un guide d'ondes en mode TE01.The waveguide 3 in the case described is a waveguide in TE01 mode.

Comme montré à la figure 4, les sorties d'ondes peuvent avoir au moins des formes en U et en L.As shown in figure 4 , the wave outputs may have at least U and L shapes.

La forme desdites sorties d'ondes est liée à la forme du boîtier 14 comprenant des rayons de raccordement de dimension importante entre la paroi 7 et les parois latérales 27 du guide d'ondes 3. Pour ne pas agrandir la largeur du boîtier 14, les sorties d'ondes sont réalisées avec des formes coudées.The shape of said wave outputs is related to the shape of the casing 14 comprising connecting radii of large size between the wall 7 and the side walls 27 of the waveguide 3. In order not to enlarge the width of the casing 14, the Wave outputs are made with bent shapes.

Ces formes de sortie d'ondes permettent de couper plus de lignes de courant sur la paroi 7 du guide d'ondes 3 pour avoir un bon couplage et laisser de la place sur les côtés des ouvertures 6 pour avoir un point de fixation du guide d'ondes 3 sur la paroi 11 de la cavité 2.These forms of wave output can cut more current lines on the wall 7 of the waveguide 3 to have a good coupling and leave room on the sides of the openings 6 to have a point of attachment of the guide. wave 3 on the wall 11 of the cavity 2.

En outre, ces formes permettent d'exciter la cavité par des champs orthogonaux et d'obtenir d'autres modes d'excitation dans la cavité 2.In addition, these forms make it possible to excite the cavity by orthogonal fields and to obtain other modes of excitation in the cavity 2.

La forme en L d'au moins une sortie d'ondes est préférentiellement réalisée de manière à ce que la plus grande branche du L est horizontale.The L shape of at least one wave output is preferably made so that the largest branch of L is horizontal.

Ladite au moins une sortie d'ondes comprend une ouverture 8 dans la cavité 2 plus grande qu'une ouverture 6 dans le guide d'ondes 3.Said at least one wave output comprises an opening 8 in the cavity 2 greater than an opening 6 in the waveguide 3.

Un cache recouvre au moins une sortie d'ondes et le moyen de fixation 17 du guide d'ondes 3 sur la cavité 2 de ladite sortie d'ondes.A cover covers at least one wave output and the fixing means 17 of the waveguide 3 on the cavity 2 of said wave output.

Ce cache couvre au moins une sortie d'ondes de manière à protéger ladite sortie d'ondes. Ce cache peut par exemple être une feuille de mica ou une matière transparente aux micro-ondes.This cover covers at least one wave output so as to protect said wave output. This cover may for example be a mica sheet or a material transparent to microwaves.

Une paroi 11 de la virole 9 comprend un embouti 18 pour le positionnement du cache de manière à ce que ledit cache est dans le prolongement de ladite paroi 11.A wall 11 of the shell 9 comprises a stamping 18 for the positioning of the cover so that said cover is in the extension of said wall 11.

Ledit cache est de dimension à s'insérer dans l'embouti 18 de manière ne pas être en saillie par rapport à la paroi latérale 11 de la cavité 2.Said cover is of dimension to be inserted in the stamping 18 so as not to protrude from the side wall 11 of the cavity 2.

Comme cela apparaît également à la figure 1, la virole 9 de la cavité 2 comprend au moins une partie inférieure 23 et une partie supérieure 24 reliée par un moyen de fixation.As it also appears in figure 1 , the ferrule 9 of the cavity 2 comprises at least a lower portion 23 and an upper portion 24 connected by a fixing means.

Le guide d'ondes 3 comprend une forme emboutie 25 permettant de contourner ledit moyen de fixation de la partie inférieure 23 avec la partie supérieure 24 de la virole 9.The waveguide 3 comprises a stamped shape 25 making it possible to bypass said fastening means of the lower part 23 with the upper part 24 of the ferrule 9.

Le guide d'ondes 3 est monté à l'envers par rapport aux guides d'ondes 3 des fours à micro-ondes 1 connus de l'homme du métier.The waveguide 3 is mounted upside down with respect to the waveguides 3 of the microwave ovens 1 known to those skilled in the art.

Ce principe de construction permet d'assembler le guide d'ondes 3 à la cavité 2 avant de fermer le boîtier 14 par le couvercle 15. D'où la possibilité de réaliser la fixation autour des ouvertures 6 du guide d'ondes 3 dans une zone réduite et limitée.This principle of construction makes it possible to assemble the waveguide 3 to the cavity 2 before closing the casing 14 by the cover 15. Hence the possibility of fixing around the openings 6 of the waveguide 3 in a reduced and limited area.

La construction du guide d'ondes 3 et l'assemblage sur la cavité 2 de la présente invention est simple et économique tout en assurant de respecter les tolérances dimensionnelles et autres exigences demandées.The construction of the waveguide 3 and the assembly on the cavity 2 of the present invention is simple and economical while ensuring compliance with dimensional tolerances and other requirements.

L'objet principal de la présente invention est de proposer une construction du guide d'ondes d'une grande flexibilité pour le raccordement du guide d'ondes à la cavité et pour l'adaptation de la cavité au magnétron.The main object of the present invention is to provide a construction of the waveguide of great flexibility for the connection of the waveguide to the cavity and for the adaptation of the cavity to the magnetron.

L'invention ne se limite pas à la description faite ci-dessus à titre d'exemple non limitatif. Elle concerne également toutes les variantes de réalisation à la portée de l'homme du métier.The invention is not limited to the description given above by way of non-limiting example. It also relates to all embodiments within the scope of the skilled person.

Claims (19)

  1. A microwave oven comprising a magnetron (4) and a waveguide (3) intended to supply an oven (1)'s cavity (2) with electromagnetic waves comprising at least one opening which lines up with at least at least one opening (6) built into a wall (7) of the waveguide (3), said openings forming at least one wave output adapted to couple the waveguide (3) and the cavity (2), said cavity (2) comprises a ferrule (9) and a back wall (10), said ferrule (9) is made up of at least two side parts (11), a lower wall (12) and an upper wall (13), characterised in that the waveguide (3) comprises a housing (14) and a lid (15) whose means of closing the waveguide (3) is independent of the means of fastening the waveguide (3) onto the ferrule (9) of the cavity (2), and in that the means of fastening (17) the waveguide (3) onto the ferrule (9) of the cavity (2) is carried out around each wave output.
  2. A microwave oven according to claim 1, characterised in that the means of fastening the waveguide (3) onto the ferrule (9) of the cavity (2) is carried out by welding.
  3. A microwave oven according to claim 1, characterised in that the means of fastening the waveguide (3) onto the ferrule (9) of the cavity (2) is carried out by clinching.
  4. A microwave oven according to any one of the claims 1 to 3, characterised in that the distance between the means of fastening (17) the waveguide (3) onto the ferrule (9) of the cavity (2) and the wave output extends within a range of 2 to 10mm.
  5. A microwave oven according to claim 4, characterised in that the distance between the means of fastening (17) the waveguide (3) onto the ferrule (9) of the cavity (2) and the wave output is preferentially of the order of 4mm.
  6. A microwave oven according to any one of the claims 1 to 5, characterised in that a shutter covers a wave output and the means of fastening (17) the waveguide (3) on the cavity (2) of said wave output.
  7. A microwave oven according to claim 6, characterised in that a wall (11) of the ferrule (9) comprises a recess (18) for positioning the shutter so that said shutter is within the extension of said wall (11).
  8. A microwave oven according to any one of the claims 1 to 7, characterised in that two wave outputs couple the waveguide (3) to the cavity (2).
  9. A microwave oven according to any one of the claims 1 to 8, characterised in that at least one wave output is U-shaped.
  10. A microwave oven according to any one of the claims 1 to 8, characterised in that at least one wave output is L-shaped.
  11. A microwave oven according to any one of the preceding claims, characterised in that the lid (15) of the waveguide (3) comprises at least one stub (20).
  12. A microwave oven according to any one of the preceding claims, characterised in that the waveguide (3) extends above the upper wall (13) of the cavity (2).
  13. A microwave oven according to any one of the preceding claims, characterised in that the magnetron (4) is placed above the oven's (1) cavity (2).
  14. A microwave oven according to any one of the preceding claims, characterised in that the ferrule (9) of the cavity (2) comprises areas (19) for connecting the walls (11, 12, and 13) of the ferrule (9) which are rounded in shape.
  15. A microwave oven according to any one of the preceding claims, characterised in that the ferrule (9) of the cavity (2) comprises at least one lower section (23) and one upper section (24) connected by a fastening means.
  16. A microwave oven according to claim 15, characterised in that the waveguide (3) comprises a recessed shape (25) enabling the fastening means of the lower section (23) to bypass the upper section (24) of the ferrule (9).
  17. A microwave oven according to any one of the preceding claims, characterised in that said at least one wave output comprises an opening (8) within the cavity (2) which is larger than an opening (6) within the waveguide (3).
  18. A microwave oven according to any one of the preceding claims, characterised in that the lid (15) of the waveguide (3) comprises a recess (25) oriented towards the exterior of the waveguide (3) placed facing an antenna (26) of the magnetron (4).
  19. A microwave oven according to any one of the preceding claims, characterised in that the lid (15) of the waveguide (3) makes it possible to adapt the waveguide (3) to the magnetron (4).
EP06114061A 2005-05-18 2006-05-17 Electromagnetic waves supplying device of a cavity of a microwave oven Active EP1725076B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL06114061T PL1725076T3 (en) 2005-05-18 2006-05-17 Electromagnetic waves supplying device of a cavity of a microwave oven

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0505059A FR2886090B1 (en) 2005-05-18 2005-05-18 DEVICE FOR SUPPLYING ELECTROMAGNETIC WAVES OF A MICROWAVE OVEN CAVITY

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EP1725076A1 EP1725076A1 (en) 2006-11-22
EP1725076B1 true EP1725076B1 (en) 2010-10-27

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EP (1) EP1725076B1 (en)
AT (1) ATE486487T1 (en)
DE (1) DE602006017770D1 (en)
ES (1) ES2353717T3 (en)
FR (1) FR2886090B1 (en)
PL (1) PL1725076T3 (en)

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Publication number Priority date Publication date Assignee Title
FR2911037B1 (en) * 2006-12-27 2009-02-06 Brandt Ind Sas MICROWAVE OVEN COMPRISING A CAVITY AND A WAVEGUIDE USING A MATERIAL FOR HIGH TEMPERATURE ENAMEL
US10764971B2 (en) * 2016-11-30 2020-09-01 Illinois Tool Works, Inc. Waveguide assembly for an RF oven
EP4216670A1 (en) * 2022-01-21 2023-07-26 Electrolux Appliances Aktiebolag Method of manufacturing a multi-component part of a household and/or cooking appliance

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Publication number Priority date Publication date Assignee Title
JPS5843874B2 (en) * 1977-09-24 1983-09-29 松下電器産業株式会社 High frequency heating device
FR2673350B1 (en) * 1991-02-22 2001-09-28 Moulinex Sa WAVEGUIDE FOR MICROWAVE OVEN.
JPH0554964A (en) * 1991-08-26 1993-03-05 Sanyo Electric Co Ltd Heating device with microwave
JP4619477B2 (en) * 2000-03-06 2011-01-26 タニコー株式会社 Microwave heating device
JP2004139863A (en) * 2002-10-18 2004-05-13 Hitachi Display Devices Ltd Microwave heating device

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ATE486487T1 (en) 2010-11-15
ES2353717T3 (en) 2011-03-04
FR2886090A1 (en) 2006-11-24
FR2886090B1 (en) 2010-10-22
PL1725076T3 (en) 2011-04-29
DE602006017770D1 (en) 2010-12-09
EP1725076A1 (en) 2006-11-22

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