EP1725076B1 - Elektromagnetischen-Wellen-Versorgungsvorrichtung eines Hohlraums eines Mikrowellenofens - Google Patents

Elektromagnetischen-Wellen-Versorgungsvorrichtung eines Hohlraums eines Mikrowellenofens 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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English (en)
French (fr)
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EP1725076A1 (de
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/pl
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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)

Claims (19)

  1. Mikrowellenherd (1) mit einem Magnetron (4) und einem Mikrowellenleiter (3) für die Versorgung eines Garraums (2) eines Herdes (1) mit elektromagnetischen Wellen, wobei der Mikrowellenherd mindestens eine Öffnung umfasst, welche korrespondierend zu mindestens einer Öffnung (6) auf einer Wand (7) des Mikrowellenleiters (3) angeordnet ist, wobei die besagten Öffnungen mindestens einen Wellenausgang bilden, um den Mikrowellenleiter (3) mit dem Garraum (2) zu verbinden, wobei der besagte Garraum (2) eine Ummantelung (9) und eine Rückwand (10) umfasst, wobei die besagte Ummantelung (9) aus zwei Seitenteilen (11), einer unteren Wand (12) und einer oberen Wand (13) besteht, dadurch gekennzeichnet, dass der Mikrowellenleiter (3) ein Gehäuse (14) und einen Deckel (15) umfasst, dessen Verschlussmittel des Mikrowellenleiters (3) unabhängig von dem Befestigungsmittel des Mikrowellenleiters (3) auf der Ummantelung (9) des Garraums (2) ist, und dass das Befestigungsmittel (17) des Mikrowellenleiters (3) auf der Ummantelung (9) des Garraums (2) um jeden Wellenausgang herum angebracht wird.
  2. Mikrowellenherd nach Anspruch 1, dadurch gekennzeichnet, dass das Befestigungsmittel (17) des Mikrowellenleiters auf der Ummantelung (9) des Garraums (2) eine Schweißverbindung ist.
  3. Mikrowellenherd nach Anspruch 1, dadurch gekennzeichnet, dass das Befestigungsmittel (17) des Mikrowellenleiters auf der Ummantelung (9) des Garraums (2) eine Clinchverbindung ist.
  4. Mikrowellenherd nach einem beliebigen der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der Abstand zwischen dem Befestigungsmittel (17) des Mikrowellenleiters (3) auf der Ummantelung (9) des Garraums (2) und dem Wellenausgang zwischen 2 und 10 mm beträgt.
  5. Mikrowellenherd nach Anspruch 4, dadurch gekennzeichnet, dass der Abstand zwischen dem Befestigungsmittel (17) des Mikrowellenleiters (3) auf der Ummantelung (9) des Garraums (2) und dem Wellenausgang vorzugsweise bei einer Größenordnung von 4 mm liegt.
  6. Mikrowellenherd nach einem beliebigen der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass eine Abdeckung einen Wellenausgang und das Befestigungsmittel (17) des Mikrowellenleiters (3) auf dem Garraum (2) des besagten Wellenausgangs überdeckt.
  7. Mikrowellenherd nach Anspruch 6, dadurch gekennzeichnet, dass eine Wand (11) der Ummantelung (9) einen Stulp (18) für die Positionierung der Abdeckung umfasst, so dass sich die besagte Abdeckung in der Verlängerung der besagten Wand (11) befindet.
  8. Mikrowellenherd nach einem beliebigen der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass zwei Wellenausgänge den Mikrowellenleiter (3) an den Garraum (2) koppeln.
  9. Mikrowellenherd nach einem beliebigen der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass zumindest ein Wellenausgang eine U-Form aufweist.
  10. Mikrowellenherd nach einem beliebigen der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass zumindest ein Wellenausgang eine L-Form aufweist.
  11. Mikrowellenherd nach einem beliebigen der vorstehenden Ansprüche, dadurch gekennzeichnet, dass der Deckel (15) des Mikrowellenleiters (3) mindestens einen Stub (20) umfasst.
  12. Mikrowellenherd nach einem beliebigen der vorstehenden Ansprüche, dadurch gekennzeichnet, dass sich der Mikrowellenleiter (3) oberhalb der oberen Wand (13) des Garraums (2) erstreckt.
  13. Mikrowellenherd nach einem beliebigen der vorstehenden Ansprüche, dadurch gekennzeichnet, dass das Magnetron (4) oberhalb des Garraums (2) des Herdes (1) angeordnet ist.
  14. Mikrowellenherd nach einem beliebigen der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Ummantelung (9) des Garraums (2) Verbindungsbereiche (19) der Wände (11, 12 und 13) der Ummantelung (9) mit abgerundeter Form umfasst.
  15. Mikrowellenherd nach einem beliebigen der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Ummantelung (9) des Garraums (2) mindestens einen unteren Teil (23) und einen oberen Teil (24) umfasst, welche anhand eines Befestigungsmittels miteinander verbunden sind.
  16. Mikrowellenherd nach Anspruch 15, dadurch gekennzeichnet, dass der Mikrowellenleiter (3) eine Aussparung (25) aufweist, um das Befestigungsmittel des unteren Teils (23) mit dem oberen Teil (24) der Ummantelung (9) zu umgehen.
  17. Mikrowellenherd nach einem beliebigen der vorstehenden Ansprüche, dadurch gekennzeichnet, dass der besagte mindestens eine Wellenausgang eine Öffnung (8) im Garraum (2) aufweist, welche größer als eine Öffnung (6) im Mikrowellenleiter (3) ist.
  18. Mikrowellenherd nach einem beliebigen der vorstehenden Ansprüche, dadurch gekennzeichnet, dass der Deckel (15) des Mikrowellenleiters (3) einen Stulp (25) umfasst, welche zum Äußeren des Mikrowellenleiters (3) gerichtet und gegenüber einer Antenne (26) des Magnetrons (4) angeordnet ist.
  19. Mikrowellenherd nach einem beliebigen der vorstehenden Ansprüche, dadurch gekennzeichnet, dass es über den Deckel (15) des Mikrowellenleiters (3) möglich ist, den Mikrowellenleiter (3) an das Magnetron (4) anzupassen.
EP06114061A 2005-05-18 2006-05-17 Elektromagnetischen-Wellen-Versorgungsvorrichtung eines Hohlraums eines Mikrowellenofens Active EP1725076B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL06114061T PL1725076T3 (pl) 2005-05-18 2006-05-17 Urządzenie do zasilania falami elektromagnetycznymi wnęki kuchenki mikrofalowej

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0505059A FR2886090B1 (fr) 2005-05-18 2005-05-18 Dispositif d'alimentation en ondes electromagnetiques d'une cavite de four a micro-ondes

Publications (2)

Publication Number Publication Date
EP1725076A1 EP1725076A1 (de) 2006-11-22
EP1725076B1 true EP1725076B1 (de) 2010-10-27

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

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2911037B1 (fr) * 2006-12-27 2009-02-06 Brandt Ind Sas Four a micro-ondes comprenant une cavite et un guide d'ondes utilisant un materiau destine a etre emaille a haute temperature
US10764971B2 (en) 2016-11-30 2020-09-01 Illinois Tool Works, Inc. Waveguide assembly for an RF oven
EP4216670A1 (de) * 2022-01-21 2023-07-26 Electrolux Appliances Aktiebolag Verfahren zur herstellung eines mehrkomponententeils eines haushalts- und/oder kochgerätes

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5843874B2 (ja) * 1977-09-24 1983-09-29 松下電器産業株式会社 高周波加熱装置
FR2673350B1 (fr) * 1991-02-22 2001-09-28 Moulinex Sa Guide d'ondes pour four a micro-ondes.
JPH0554964A (ja) * 1991-08-26 1993-03-05 Sanyo Electric Co Ltd マイクロ波加熱装置
JP4619477B2 (ja) * 2000-03-06 2011-01-26 タニコー株式会社 マイクロ波加熱装置
JP2004139863A (ja) * 2002-10-18 2004-05-13 Hitachi Display Devices Ltd マイクロ波加熱装置

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

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