EP0875128A1 - Microwave application device, particularly for baking products on a metal carrier - Google Patents

Microwave application device, particularly for baking products on a metal carrier

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Publication number
EP0875128A1
EP0875128A1 EP96901421A EP96901421A EP0875128A1 EP 0875128 A1 EP0875128 A1 EP 0875128A1 EP 96901421 A EP96901421 A EP 96901421A EP 96901421 A EP96901421 A EP 96901421A EP 0875128 A1 EP0875128 A1 EP 0875128A1
Authority
EP
European Patent Office
Prior art keywords
guide
waveguide
products
metal
microwave
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.)
Withdrawn
Application number
EP96901421A
Other languages
German (de)
French (fr)
Inventor
Claude Marzat
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.)
Danone SA
Original Assignee
BELIN LU BISCUITS FRANCE
Belin-Lu Biscuits France
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 BELIN LU BISCUITS FRANCE, Belin-Lu Biscuits France filed Critical BELIN LU BISCUITS FRANCE
Publication of EP0875128A1 publication Critical patent/EP0875128A1/en
Withdrawn legal-status Critical Current

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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
    • H05B6/78—Arrangements for continuous movement of material
    • H05B6/782—Arrangements for continuous movement of material wherein the material moved is food
    • 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 applicator device for the treatment, in particular cooking, of relatively small or thin individual products, deposited on a metal support.
  • the frequency band of the electromagnetic waves between 300 MHz and 300 GHz is designated by microwave.
  • the object of the invention is to provide a structure suitable in particular for baking food products, for example cookies, in place on a metal surface and capable of operating, in very substantially reduced times compared to the cooking times of traditional ovens heated by pulsed hot air and / or infrared, cooking of comparable quality and in very good safety conditions and despite the use as a cooking support of said products of a metal surface, for example a grid or fixed floor or conveyor belt.
  • the subject of the invention is a microwave applicator device in particular for cooking products on a metallic support, comprising at least one microwave generator and a metallic waveguide, in particular of rectangular section, characterized in that said waveguide forms a cooking enclosure, the floor of which consists of a removable metallic flat support, on which the products to be cooked are deposited.
  • the waveguide is connected to the microwave generator by an auxiliary guide whose axis forms with respect to the axis of said guide an angle equal to the angle of Brewster or neighbor thereof and such that the electric field is in a plane perpendicular to the metallic plane support.
  • said metal flat support is a sole or plate immobile with respect to the inverted U-shaped upper part of the waveguide during the application of the microwaves, the two ends of the guide being provided with a means of closing-confinement of the cooking chamber thus produced.
  • said metal plane support is a conveyor belt, the two ends of the guide possibly being provided with means suitable for limiting the leakage of waves to the outside below the tolerated values, the direction of movement of the mat being parallel to the axis of the guide.
  • the device of the invention comprises a plurality of waveguides paired in parallel forming a single-mode microwave cavity, the lower horizontal part of the guides being formed by a common conveyor belt .
  • a conveyor belt whether the waveguide is single or multi-ducted, serves several waveguide cavities arranged in cascade above the upper strand of the belt, so that the products undergo during their moving on the carpet a succession of microwave applications.
  • Figure 1 is a schematic vertical sectional view of a first embodiment of a device according to the invention.
  • FIG. 2 is a schematic vertical section view of a second embodiment
  • Figure 3 is a schematic side view of an alternative embodiment of the device of Figure 2.
  • FIG. 1 there is shown at 1 a waveguide of rectangular section comprising, two sidewalls 2 and 3 and a ceiling wall 4, the floor wall being constituted by a separate flat support 5.
  • the guide 1 and the flat support 5 are made of a good conductive metal and preferably non-magnetic.
  • the guide 1 forms a closed enclosure (the opposite ends not being shown in FIG. 1) and only open on its underside, the opening being closed by the flat support 5 which is for example a sole or plate on which are deposited products 6, for example cookies, madeleines, or other biscuit, pastry, pastry products, of the same kind, which one wants to bake or whose humidity one wants to homogenize.
  • the guide 1 is connected to a microwave generator (not shown in Figure 1) connected so that the electric field E generated in the guide 1 is substantially perpendicular to the metal plane support 5 during its longitudinal propagation.
  • the assembly thus formed can form an individual cooking oven from which the bottom or cooking plate 5 can be extracted to load and unload products, the device operating like a traditional microwave oven.
  • FIG. 2 illustrates another embodiment in which, on the one hand, several waveguides similar to guide 1 are paired or joined so as to form three rectangular conduits open on their underside and, on the other hand, the flat metal support 5 is constituted by a single element, common and more particularly by the upper strand of a conveyor belt T.
  • the upper strand of the belt T circulates while being kept at a short distance (1 to 10 mm at the frequency 2450 MHz ) of the edge of the vertical separating partitions 8 and 9 of the adjoining waveguides forming a single-mode microwave cavity 11.
  • the belt is driven in a direction 12 parallel to the axis of the conduits of the cavity 11.
  • the waves are sent into each of the conduits of the cavity there substantially under incidence of Brewster, through openings 14 formed in the upper horizontal wall of the cavity 11.
  • openings 14 are fixed auxiliary guides of rectangular section whose axes are inclined on the axis of the conduits of the cavity 11 by an angle of the order of the Brewster angle for the type of products 6 treated, that is to say around 30 ° with the horizontal, the emitted electric field remaining in a plane perpendicular to the metal mat.
  • the width of the conduits of the cavity 11 is for example of the order of 8 to 10 cm for a microwave generator of frequency 2450 MHz + 50 MHz operating in TE 1Q fundamental mode, the height of the conduits being of the order of 4 to 5 cm, at a distance from the carpet of between 1 and 10 mm approximately and the length of the order of 60 to 120 cm.
  • the frequency 915 MHz and more generally of the other frequencies for ISM applications these dimensions are different, substantially in the inverse ratio of the frequencies.
  • the cavity 11 can of course include any number of different variable conduits, this number being able to be reduced to 1.
  • FIG. 3 there is shown in side elevation a conveyor belt T driving the products to be cooked 6 successively in three aligned cavities 11 ', 11 ", 11"', for example identical to the cavity 11 in FIG. 2.
  • Each cavity 11 ′, 11 ′′, 11 ′′ ’ single or multi-duct, comprises as many microwave generators G as ducts, arranged above the ducts and each connected to a duct by an auxiliary guide 15 inclined by a angle a equal to or close to the Brewster angle for the products to be treated with a direction of the electric field emitted in a plane perpendicular to the metal mat.
  • the auxiliary guides 15 open into the respective conduits through the corresponding openings 14 which are arranged closer to the upstream end of the conduits than to the downstream end.
  • the axis of the auxiliary guides 15 intersects the axis of the conduits of the cavities 11 ', 11 ", 11"' and define with him vertical planes parallel to the direction of movement 12 of the mat T
  • the length of the cavity conduits is such that at the downstream end there is no need to provide a sophisticated anti-leakage device, the microwave energy having been practically all absorbed
  • the distance between said end and the point junction between the cavity and the auxiliary guide 15 being much greater than one or more wavelengths
  • an anti-leakage device such as a wave trap, curtain of suspended chains symbolized in 16, microwave absorbing materials
  • an additional heating / cooking device symbolized in 17 providing for example heating by pulsed air or by infrared radiation.
  • the products 6 undergo three successive applications of microwaves, interspersed with a rest phase or auxiliary heating / cooking
  • the residence time of the products in the cavity conduits naturally depends on their nature and on the type of cooking desired.
  • the number of successive cavities can of course vary and be greater than 3
  • the invention applies to all types of cavity or waveguide, of rectangular, square, semi-circular or other cross-section, insofar as the bottom wall of the cavity or of the guide can be replaced by a flat metallic separable support, movable or not movable relative to the body of the cavity or the waveguide and on which are placed, directly or not, the leathers, these being constituted by individual elements relatively small dimensions
  • Guides and cavities generally operate in T ⁇ ⁇ Q1 mode, in one of said frequencies for ISM applications
  • the invention can be applied to something other than cooking such products, for example, drying or regulating humidity profiles, as well as any heat treatment, in general.

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

Abstract

A microwave application device, particularly for baking products on a metal carrier, is disclosed. The microwave application device, particularly for baking products on a metal carrier, includes at least one microwave generator (G) and a metal waveguide, in particular one having a rectangular cross section (1, 11, 11', 11', 11''), characterised in that said waveguide defines a baking chamber with a floor consisting of a removable flat metal carrier (5, T) on which the products to be baked (6) are placed. Said device is particularly useful for baking food products.

Description

DISPOSITIF APPLICATEUR DE MICRO-ONDES NOTAMMENT POUR LA CUISSON DE PRODUITS SUR UN SUPPORT METALLIQUE MICROWAVE APPLICATOR DEVICE, PARTICULARLY FOR COOKING PRODUCTS ON A METAL SUPPORT
La présente invention a trait à un dispositif applicateur de micro-ondes pour le traitement, en particulier la cuisson, de produits individuels relativement petits ou minces, déposés sur un support métallique. On désigne par micro-ondes la bande des fréquences des ondes électromagnétiques comprises entre 300MHz et 300GHz.The present invention relates to a microwave applicator device for the treatment, in particular cooking, of relatively small or thin individual products, deposited on a metal support. The frequency band of the electromagnetic waves between 300 MHz and 300 GHz is designated by microwave.
Le but de l'invention est de proposer une structure apte notamment à la cuisson de produits alimentaires, par exemple des biscuits, en place sur un plan métallique et capable d'opérer, dans des temps très substantiellement réduits par rapport aux temps de cuisson des fours traditionnels à chauffage par air chaud puisé et/ou infrarouges, des cuissons de qualité comparable et dans de très bonnes conditions de sécurité et en dépit de l'utilisation comme support de cuisson desdits produits d'un plan métallique, par exemple une grille ou sole fixe ou un tapis convoyeur.The object of the invention is to provide a structure suitable in particular for baking food products, for example cookies, in place on a metal surface and capable of operating, in very substantially reduced times compared to the cooking times of traditional ovens heated by pulsed hot air and / or infrared, cooking of comparable quality and in very good safety conditions and despite the use as a cooking support of said products of a metal surface, for example a grid or fixed floor or conveyor belt.
A cet effet, l'invention a pour objet un dispositif applicateur de micro-ondes notamment pour la cuisson de produits sur un support métallique, comprenant au moins un générateur micro-ondes et un guide d'onde métallique, notamment de section rectangulaire, caractérisé en ce que ledit guide d'onde forme une enceinte de cuisson dont le plancher est constitué d'un support plan métallique amovible, sur lequel sont déposés les produits à cuire. De préférence, le guide d'onde est relié au générateur micro-ondes par un guide auxiliaire dont l'axe forme par rapport à l'axe dudit guide un angle égal à l'angle de Brewster ou voisin de celui-ci et tel que le champ électrique soit dans un plan perpendiculaire au support plan métallique.To this end, the subject of the invention is a microwave applicator device in particular for cooking products on a metallic support, comprising at least one microwave generator and a metallic waveguide, in particular of rectangular section, characterized in that said waveguide forms a cooking enclosure, the floor of which consists of a removable metallic flat support, on which the products to be cooked are deposited. Preferably, the waveguide is connected to the microwave generator by an auxiliary guide whose axis forms with respect to the axis of said guide an angle equal to the angle of Brewster or neighbor thereof and such that the electric field is in a plane perpendicular to the metallic plane support.
Suivant un mode de mise en oeuvre, ledit support plan métallique est une sole ou plaque immobile par rapport à la partie supérieure en U renversé du guide d'onde durant l'application des micro-ondes, les deux extrémités du guide étant munies d'un moyen de fermeture-confinement de l'enceinte de cuisson ainsi réalisée.According to one embodiment, said metal flat support is a sole or plate immobile with respect to the inverted U-shaped upper part of the waveguide during the application of the microwaves, the two ends of the guide being provided with a means of closing-confinement of the cooking chamber thus produced.
Suivant un autre mode de mise en oeuvre, ledit support plan métallique est un tapis de convoyage, les deux extrémités du guide étant éventuellement munies de moyens propres à limiter les fuites d'ondes vers l'extérieur en dessous des valeurs tolérées, la direction de déplacement du tapis étant parallèle à l'axe du guide. Avantageusement, suivant un second mode de mise en oeuvre, le dispositif de l'invention comporte une pluralité de guides d'ondes jumelés en parallèle formant une cavité micro-ondes monomode, la partie horizontale inférieure des guides étant formée par un tapis de convoyage commun. En variante, un tel tapis de convoyage, que le guide d'onde soit mono ou multi-conduits, dessert plusieurs cavités guides d'onde agencées en cascade au dessus du brin supérieur du tapis, en sorte que les produits subissent au cours de leur déplacement sur le tapis une succession d'applications de micro-ondes.According to another embodiment, said metal plane support is a conveyor belt, the two ends of the guide possibly being provided with means suitable for limiting the leakage of waves to the outside below the tolerated values, the direction of movement of the mat being parallel to the axis of the guide. Advantageously, according to a second embodiment, the device of the invention comprises a plurality of waveguides paired in parallel forming a single-mode microwave cavity, the lower horizontal part of the guides being formed by a common conveyor belt . As a variant, such a conveyor belt, whether the waveguide is single or multi-ducted, serves several waveguide cavities arranged in cascade above the upper strand of the belt, so that the products undergo during their moving on the carpet a succession of microwave applications.
D'autres caractéristiques et avantages ressortiront de la description qui va suivre de modes de réalisation du dispositif de l'invention, description donnée à titre d'exemple uniquement et en regard du dessin annexé sur lequel :Other characteristics and advantages will emerge from the description which follows of embodiments of the device of the invention, description given by way of example only and with reference to the appended drawing in which:
Figure 1 est une vue en coupe verticale schématique d'un premier mode de réalisation d'un dispositif selon l'invention ;Figure 1 is a schematic vertical sectional view of a first embodiment of a device according to the invention;
Figure 2 est une vue en coupe verticale schématique d'un second mode de réalisation, etFIG. 2 is a schematic vertical section view of a second embodiment, and
Figure 3 est une vue schématique de côté d'une variante de réalisation du dispositif de la figure 2.Figure 3 is a schematic side view of an alternative embodiment of the device of Figure 2.
Sur la figure 1, on a représenté en 1 un guide d'onde de section rectangulaire comprenant, deux parois de flanc 2 et 3 et une paroi de plafond 4, la paroi de plancher étant constituée par un support plan distinct 5.In Figure 1, there is shown at 1 a waveguide of rectangular section comprising, two sidewalls 2 and 3 and a ceiling wall 4, the floor wall being constituted by a separate flat support 5.
Le guide 1 et le support plan 5 sont en un métal bon conducteur et de préférence non magnétique. Le guide 1 forme une enceinte fermée (les extrémités opposées n'étant pas représentées sur la figure 1) et seulement ouverte sur sa face inférieure, l'ouverture étant obturée par le support plan 5 qui est par exemple une sole ou plaque sur laquelle sont déposés des produits 6, par exemple des biscuits, des madeleines, ou autres produits de biscuiterie, viennoiserie, pâtisserie, du même genre, que l'on veut cuire ou dont on veut homogénéiser l'humidité.The guide 1 and the flat support 5 are made of a good conductive metal and preferably non-magnetic. The guide 1 forms a closed enclosure (the opposite ends not being shown in FIG. 1) and only open on its underside, the opening being closed by the flat support 5 which is for example a sole or plate on which are deposited products 6, for example cookies, madeleines, or other biscuit, pastry, pastry products, of the same kind, which one wants to bake or whose humidity one wants to homogenize.
Le guide 1 est relié à un générateur micro-ondes (non représenté sur la figure 1) connecté de façon que le champ électrique E engendré dans le guide 1 soit sensiblement perpendiculaire au support plan métallique 5 lors de sa propagation longitudinale.The guide 1 is connected to a microwave generator (not shown in Figure 1) connected so that the electric field E generated in the guide 1 is substantially perpendicular to the metal plane support 5 during its longitudinal propagation.
L'ensemble ainsi constitué peut former un four de cuisson individuel dont la sole ou plaque de cuisson 5 peut être extraite pour charger et décharger des produits, le dispositif fonctionnant comme un four à micro-ondes traditionnel.The assembly thus formed can form an individual cooking oven from which the bottom or cooking plate 5 can be extracted to load and unload products, the device operating like a traditional microwave oven.
La figure 2 illustre un autre mode de réalisation dans lequel, d'une part, plusieurs guides d'ondes similaires au guide 1 sont jumelés ou accolés en sorte de former trois conduits rectangulaires ouverts sur leur face inférieure et, d'autre part, le support plan métallique 5 est constitué par un élément unique, commun et plus particulièrement par le brin supérieur d'un tapis de convoyage T. Le brin supérieur du tapis T circule en étant maintenu à faible distance (1 à 10 mm à la fréquence 2450 MHz) de la tranche des cloisons séparatrices verticales 8 et 9 des guides d'onde accolés formant une cavité micro-ondes monomode 11.FIG. 2 illustrates another embodiment in which, on the one hand, several waveguides similar to guide 1 are paired or joined so as to form three rectangular conduits open on their underside and, on the other hand, the flat metal support 5 is constituted by a single element, common and more particularly by the upper strand of a conveyor belt T. The upper strand of the belt T circulates while being kept at a short distance (1 to 10 mm at the frequency 2450 MHz ) of the edge of the vertical separating partitions 8 and 9 of the adjoining waveguides forming a single-mode microwave cavity 11.
Le tapis est entraîné suivant une direction 12 parallèle à l'axe des conduits de la cavité 11.The belt is driven in a direction 12 parallel to the axis of the conduits of the cavity 11.
Avantageusement, entre la tranche des flancs 7 et 10 de la cavité il et le tapis T sont interposés des profilés en U formant pièges à ondes symbolisés en 13 et destinés à réduire au maximum les fuites micro-ondes. De préférence, les ondes sont envoyées dans chacun des conduits de la cavité il sensiblement sous incidence de Brewster, par l'intermédiaire d'ouvertures 14 ménagées dans la paroi horizontale supérieure de la cavité 11. Sur ces ouvertures 14 sont fixés des guides auxiliaires de section rectangulaire dont les axes sont inclinés sur l'axe des conduits de la cavité 11 d'un angle de l'ordre de l'angle de Brewster pour le type de produits 6 traités, c'est à dire aux environs de 30° avec l'horizontale, le champ électrique émis restant dans un plan perpendiculaire au tapis métallique.Advantageously, between the edge of the sides 7 and 10 of the cavity it and the mat T are interposed U-shaped profiles forming wave traps symbolized at 13 and intended to minimize microwave leakage. Preferably, the waves are sent into each of the conduits of the cavity there substantially under incidence of Brewster, through openings 14 formed in the upper horizontal wall of the cavity 11. On these openings 14 are fixed auxiliary guides of rectangular section whose axes are inclined on the axis of the conduits of the cavity 11 by an angle of the order of the Brewster angle for the type of products 6 treated, that is to say around 30 ° with the horizontal, the emitted electric field remaining in a plane perpendicular to the metal mat.
La largeur des conduits de la cavité 11 est par exemple de l'ordre de 8 à 10 cm pour un générateur micro-ondes de fréquence 2450 MHz + 50 MHz fonctionnant en mode fondamental TE1Q, la hauteur des conduits étant de l'ordre de 4 à 5 cm, à une distance du tapis comprise entre 1 et 10 mm environ et la longueur de l'ordre de 60 à 120 cm. Dans le cas de la fréquence 915 MHz et d'une manière plus générale des autres fréquences pour applications ISM (Industrielles, Scientifiques et Médicales) ces dimensions sont différentes, sensiblement dans le rapport inverse des fréquences.The width of the conduits of the cavity 11 is for example of the order of 8 to 10 cm for a microwave generator of frequency 2450 MHz + 50 MHz operating in TE 1Q fundamental mode, the height of the conduits being of the order of 4 to 5 cm, at a distance from the carpet of between 1 and 10 mm approximately and the length of the order of 60 to 120 cm. In the case of the frequency 915 MHz and more generally of the other frequencies for ISM applications (Industrial, Scientific and Medical) these dimensions are different, substantially in the inverse ratio of the frequencies.
La cavité 11 peut bien entendu comporter un nombre quelconque de conduits différents variable, ce nombre pouvant être réduit à 1. Sur la figure 3, on a représenté en élévation latérale un tapis convoyeur T entraînant les produits à cuire 6 successivement dans trois cavités alignées 11', 11", 11"', par exemple identiques à la cavité 11 de la figure 2.The cavity 11 can of course include any number of different variable conduits, this number being able to be reduced to 1. In FIG. 3, there is shown in side elevation a conveyor belt T driving the products to be cooked 6 successively in three aligned cavities 11 ', 11 ", 11"', for example identical to the cavity 11 in FIG. 2.
Chaque cavité 11' , 11" , 11" ' , mono ou multi-conduits, comporte autant de générateurs micro-ondes G que de conduits, disposés au dessus des conduits et reliés chacun à un conduit par un guide auxiliaire 15 incliné d'un angle a égal à l'angle de Brewster ou voisin de ce dernier pour les produits à traiter avec une direction du champ électrique émis dans un plan perpendiculaire au tapis métallique.Each cavity 11 ′, 11 ″, 11 ″ ’, single or multi-duct, comprises as many microwave generators G as ducts, arranged above the ducts and each connected to a duct by an auxiliary guide 15 inclined by a angle a equal to or close to the Brewster angle for the products to be treated with a direction of the electric field emitted in a plane perpendicular to the metal mat.
Les guides auxiliaires 15 débouchent dans les conduits respectifs par les ouvertures correspondantes 14 qui sont disposées plus près de l'extrémité amont des conduits que de l'extrémité aval. L'axe des guides auxiliaires 15 intersecte l'axe des conduits des cavités 11', 11", 11"' et définir avec lui des plans verticaux parallèles à la direction de déplacement 12 du tapis TThe auxiliary guides 15 open into the respective conduits through the corresponding openings 14 which are arranged closer to the upstream end of the conduits than to the downstream end. The axis of the auxiliary guides 15 intersects the axis of the conduits of the cavities 11 ', 11 ", 11"' and define with him vertical planes parallel to the direction of movement 12 of the mat T
La longueur des conduits des cavités est telle qu'à l'extrémité aval il n'y a pas lieu de prévoir un dispositif anti-fuites sophistiqué, l'énergie micro-ondes ayant été pratiquement toute absorbée La distance entre ladite extrémité et le point de jonction entre la cavité et le guide auxiliaire 15 étant largement supérieur à une ou plusieurs longueurs d'onde Par contre, à l'extrémité amont, on peut avantageusement prévoir un dispositif anti-fuites, tel que piège à onde, rideau de chaînettes suspendues symbolisé en 16 , matériaux absorbant les micro-ondes, eteThe length of the cavity conduits is such that at the downstream end there is no need to provide a sophisticated anti-leakage device, the microwave energy having been practically all absorbed The distance between said end and the point junction between the cavity and the auxiliary guide 15 being much greater than one or more wavelengths On the other hand, at the upstream end, it is advantageously possible to provide an anti-leakage device, such as a wave trap, curtain of suspended chains symbolized in 16, microwave absorbing materials,
Entre deux cavités peut être intercalé un dispositif de chauffage/cuisson complémentaire symbolisé en 17, dispensant par exemple un chauffage par air puisé ou par rayonnement infrarougeBetween two cavities can be inserted an additional heating / cooking device symbolized in 17, providing for example heating by pulsed air or by infrared radiation.
Dans le mode de mise en oeuvre de la figure 3, les produits 6 subissent trois applications successives de micro- ondes, entrecoupées d'une phase de repos ou de chauffage/cuisson auxiliaireIn the embodiment of Figure 3, the products 6 undergo three successive applications of microwaves, interspersed with a rest phase or auxiliary heating / cooking
Le temps de séjour des produits dans les conduits des cavités dépend bien entendu de leur nature et du type de cuisson désirée. Le nombre des cavités successives peut bien entendu varier et être supérieur à 3The residence time of the products in the cavity conduits naturally depends on their nature and on the type of cooking desired. The number of successive cavities can of course vary and be greater than 3
D'une manière générale, l'invention s'applique à tous type de cavité ou de guide d'onde, de section rectangulaire, carrée, semi-circulaire ou autre, dans la mesure où la paroi inférieure de la cavité ou du guide peut être remplacée par un support plat mmee métallique séparable, mobile ou non par rapport au corps de la cavité ou du guide d'onde et sur lequel sont placés, directement ou non, les produits à cuirs, ceux-ci étant constitués par des éléments individuels de dimensions relativement réduitesIn general, the invention applies to all types of cavity or waveguide, of rectangular, square, semi-circular or other cross-section, insofar as the bottom wall of the cavity or of the guide can be replaced by a flat metallic separable support, movable or not movable relative to the body of the cavity or the waveguide and on which are placed, directly or not, the leathers, these being constituted by individual elements relatively small dimensions
Les guides et cavités fonctionnent d'une manière générale en mode TΞΠQ1, dans l'une desdites fréquences pour applications ISMGuides and cavities generally operate in TΞ ΠQ1 mode, in one of said frequencies for ISM applications
Il est a noter que les températures mise en jeu au cours de ia cuisson de ces z 'υes de Drcdu_ts a savoir de i orαre de 250°C, sont parfaitement supportées par les supports métalliques (5,T) .It should be noted that the temperatures involved during the cooking of these Drcdu_ts z ' ies namely i orαre of 250 ° C, are perfectly supported by the metal supports (5, T).
Il est enfin à signaler que l'invention peut s'appliquer à autre chose que la cuisson de tels produits, par exemple, au séchage ou régulation de profils d'humidité, ainsi qu'à tout traitement thermique, d'une façon générale. Finally, it should be noted that the invention can be applied to something other than cooking such products, for example, drying or regulating humidity profiles, as well as any heat treatment, in general.

Claims

R E V E N D I C A T I O N S
1. Dispositif applicateur de micro-ondes notamment pour la cuisson de produits sur un support métallique, comprenant au moins un générateur micro-ondes (G) et un guide d'onde métallique, notamment de section rectangulaire (1, 11, 11', 11", 11"') , caractérisé en ce que ledit guide d'onde forme une enceinte de cuisson dont le plancher est constitué d'un support plan métallique (5,T) amovible, sur lequel sont déposés les produits à cuire (6) .1. Microwave applicator device in particular for cooking products on a metal support, comprising at least one microwave generator (G) and a metal waveguide, in particular of rectangular section (1, 11, 11 ', 11 ", 11" '), characterized in that said waveguide forms a cooking enclosure, the floor of which consists of a removable flat metal support (5, T), on which the products to be cooked (6 ).
2. Dispositif suivant la revendication 1, caractérisé en ce que le guide d'onde (11', 11", 11"') est relié au générateur micro-ondes (G) par un guide auxiliaire (15) dont l'axe forme par rapport à l'axe dudit guide un angle (a) égal à l'angle de Brewster ou voisin de celui-ci et tel que le champ électrique (E) soit dans un plan perperndiculaire au support plan métallique.2. Device according to claim 1, characterized in that the waveguide (11 ', 11 ", 11"') is connected to the microwave generator (G) by an auxiliary guide (15) whose axis forms relative to the axis of said guide an angle (a) equal to the Brewster angle or close to it and such that the electric field (E) is in a plane perperndicular to the metallic plane support.
3. Dispositif suivant la revendication 1 ou 2, caractérisé en ce que ledit support plan métallique est une sole ou plaque (5) immobile par rapport à la partie supérieure en U renversé du guide d'onde (1) durant l'application des micro-ondes, les deux extrémités du guide étant munies d'un moyen de fermeture-confinement de l'enceinte de cuisson ainsi réalisée.3. Device according to claim 1 or 2, characterized in that said metal flat support is a sole or plate (5) immobile relative to the upper U-shaped part inverted from the waveguide (1) during the application of the microphones -waves, the two ends of the guide being provided with a means of closing-confinement of the cooking chamber thus produced.
4. Dispositif suivant la revendication 1 ou 2, caractérisé en ce que ledit support plan métallique est un tapis de convoyage (T) , les deux extrémités du guide (1) étant éventuellement munies de moyens (16) propres à limiter les fuites d'ondes vers l'extérieur en dessous des valeurs tolérées, la direction de déplacement du tapis étant parallèle à l'axe du guide. 4. Device according to claim 1 or 2, characterized in that said metal flat support is a conveyor belt (T), the two ends of the guide (1) being optionally provided with means (16) suitable for limiting leaks of waves outwards below the tolerated values, the direction of movement of the belt being parallel to the axis of the guide.
5. Dispositif suivant la revendication 4, caractérisé en ce qu'il comporte une pluralité de guides d'ondes (il) jumelés en parallèle formant une cavité micro-ondes monomode, la partie horizontale inférieure des guides étant formée par un tapis de convoyage (T) commun. 5. Device according to claim 4, characterized in that it comprises a plurality of waveguides (il) twinned in parallel forming a single-mode microwave cavity, the lower horizontal part of the guides being formed by a conveyor belt ( T) common.
6. Dispositif suivant la revendication 4 ou 5, caractérisé en ce que ledit tapis de convoyage (T) dessert plusieurs cavités-guides d'onde (11 ' , 11" , 11" ' ) mono ou multi- conduits agencés en cascade au dessus du brin supérieur du tapis, en sorte que les produits subissent au cours de leur déplacement sur le tapis (T) une succession d'applications de micro-ondes .6. Device according to claim 4 or 5, characterized in that said conveyor belt (T) serves several wave guide cavities (11 ', 11 ", 11"') mono or multi-conduits arranged in cascade above of the upper strand of carpet, so that the products undergo during their movement on the carpet (T) a succession of microwave applications.
7. Dispositif suivant la revendication 6, caractérisé en ce qu'entre deux cavités (11' , 11" , 11" ' ) est agencé un dispositif de chauffage/cuisson auxiliaire (17) , notamment à air chaud ou infrarouge .7. Device according to claim 6, characterized in that between two cavities (11 ', 11 ", 11"') is arranged an auxiliary heating / cooking device (17), in particular with hot air or infrared.
8. Dispositif suivant l'une des revendications 1 à 7, caractérisé en ce que le ou les conduits ou cavités guides d'onde (1, il, il', il", il"') sont rectangulaires, d'une largeur comprise entre 8 et 10 cm, d'une hauteur comprise entre 4 et 5 cm et d'une longueur comprise entre 60 et 120 cm pour un générateur micro-ondes (G) de fréquence 2450 MHz fonctionnant en mode TE10. 8. Device according to one of claims 1 to 7, characterized in that the one or more waveguide conduits or cavities (1, il, il ', il ", il"') are rectangular, of a width included between 8 and 10 cm, with a height between 4 and 5 cm and with a length between 60 and 120 cm for a microwave generator (G) with 2450 MHz frequency operating in TE 10 mode.
9. Dispositif suivant l'une des revendications 4 à 8, caractérisé en ce que le tapis convoyeur métallique est chauffé par induction. 9. Device according to one of claims 4 to 8, characterized in that the metal conveyor belt is heated by induction.
EP96901421A 1996-01-19 1996-01-19 Microwave application device, particularly for baking products on a metal carrier Withdrawn EP0875128A1 (en)

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PCT/FR1996/000093 WO1997026777A1 (en) 1996-01-19 1996-01-19 Microwave application device, particularly for baking products on a metal carrier

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WO1997026777A1 (en) 1997-07-24
US6153868A (en) 2000-11-28

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