EP2265090A1 - Mikrowellenherd mit einem Vorschubkastensystem - Google Patents

Mikrowellenherd mit einem Vorschubkastensystem Download PDF

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Publication number
EP2265090A1
EP2265090A1 EP09006048A EP09006048A EP2265090A1 EP 2265090 A1 EP2265090 A1 EP 2265090A1 EP 09006048 A EP09006048 A EP 09006048A EP 09006048 A EP09006048 A EP 09006048A EP 2265090 A1 EP2265090 A1 EP 2265090A1
Authority
EP
European Patent Office
Prior art keywords
feed box
microwave oven
primary
secondary feed
oven according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP09006048A
Other languages
English (en)
French (fr)
Other versions
EP2265090B1 (de
Inventor
Norbert Daenzer
Martin Gasch
Bernd Heisswolf
Arnd Dr. Hofmann
Reinhold Hofmann
Branko Ivanovic
Herbert Michel
Gerhard Schaeff
Tobias Weber
Abdel-Ilah Zbat
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.)
Electrolux Home Products Corp NV
Original Assignee
Electrolux Home Products Corp NV
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 Electrolux Home Products Corp NV filed Critical Electrolux Home Products Corp NV
Priority to EP09006048.4A priority Critical patent/EP2265090B1/de
Publication of EP2265090A1 publication Critical patent/EP2265090A1/de
Application granted granted Critical
Publication of EP2265090B1 publication Critical patent/EP2265090B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/70—Feed lines
    • 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
    • H05B6/74—Mode transformers or mode stirrers
    • H05B6/745—Rotatable stirrers
    • 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
    • H05B6/76—Prevention of microwave leakage, e.g. door sealings

Definitions

  • the present invention relates to a microwave oven with a feed box system according to claim 1.
  • Microwave ovens are efficient cooking devices for heating food and beverages.
  • the strong electromagnetic fields used for the microwave heating are a potential threat to the health of the operator.
  • a special attention has to be paid in order to minimize any leakage of such electromagnetic waves.
  • connection between the wave source and the oven cavity One of the critical parts within the microwave ovens is the connection between the wave source and the oven cavity. Very high power densities of the electromagnetic field occur in this area. Thus, a wave-tight system for the connection between the wave source and the oven cavity is required. For example, a magnetron can be used as the wave source.
  • connection between the magnetron and the oven cavity comprises three functional units.
  • the first functional unit is a feed box acting as a wave channel between the magnetron and the oven cavity.
  • the second functional unit is an interface portion for tightly mounting the magnetron to the feed box.
  • the third functional unit is the fixation of the feed box to the oven cavity.
  • connection of the magnetron to the feed box is unproblematic with respect to microwave leakage. Also the setup of the feed box causes no difficulties related to microwave leakage.
  • the critical point is the fixation of the feed box onto the oven cavity, since the connection between two separate components may create gaps through which microwaves can emanate into the surrounding area. For example, said gaps are caused by mechanical tolerances or by a limited planarity.
  • the US 5,825,000 describes a microwave oven with a feed box fixed directly at the oven cavity.
  • the feed box comprises a wider portion and a smaller portion.
  • a magnetron is fixed at the wider portion.
  • a microwave oven with a feed box under the bottom wall of the oven cavity is disclosed.
  • the feed box extends substantially under the whole bottom wall.
  • a magnetron is arranged under the feed box.
  • Within said feed box there are a stirrer and an antenna of said magnetron.
  • the US 3,939,320 discloses a microwave oven with a feed box above the oven cavity.
  • a magnetron is arranged in the outer portion of the microwave oven. Between the feed box and the magnetron is a microwave channel.
  • the microwave oven comprises a feed box system, wherein:
  • the core of the present invention is the feed box system with two separate feed boxes, wherein one feed box forms a single-piece part with the cavity wall, on the one hand and the direction of the antenna with respect to the normal vector of the cavity wall on the other hand.
  • the number of potential gaps is reduced.
  • the secondary feed box and the cavity wall form a single-piece part, so that there cannot be any potential gap between them.
  • the primary feed box cover the recess of the secondary feed box, so that the probability of potential gaps between the primary and secondary feed box is reduced.
  • the direction of the antenna impacts the streamlines of the electric and magnetic fields of the microwave with respect to the cavity wall.
  • the axis of the antenna extends orthogonal to the normal vector of that cavity wall, at which the feed box system is arranged.
  • This constellation of the antenna restricts the directions of the streamlines of the electric and magnetic fields and supports the closeness of the oven cavity.
  • overlapping portions of the primary feed box and the secondary feed box are formed complementary to each other, so that the overlapping portions form a wave labyrinth.
  • the wave labyrinth contributes to the closeness of the oven cavity.
  • the overlapping portions of the primary feed box and/or of the secondary feed box have an S-shaped or meander-shaped cross-section.
  • the secondary feed box is formed out of that cavity wall, at which the feed box system is arranged, by embossing and/or deep-drawing.
  • the embossing and/or deep-drawing allow an efficient production of the microwave oven with the feed box system.
  • the secondary feed box may be formed out of the oven cavity by embossing and/or deep-drawing. This is an efficient method for the production of the oven cavity with the secondary feed box.
  • the secondary feed box and at least that cavity wall, at which the feed box system is arranged may be enamelled. Since the primary feed box is fixed afterwards, the primary feed box remains un-enamelled. This allows a very good electrical contact between the wave source and the primary feed box.
  • the secondary feed box and the oven cavity may be enamelled.
  • the primary feed box is welded, screwed, clinched and/or riveted to the secondary feed box.
  • the primary feed box covers a recess of the secondary feed box.
  • the wave labyrinth may enclose the recess completely or at least partially.
  • the microwave oven may comprise at least one stirrer arranged at least partially within the secondary feed box.
  • the stirrer may extend partially into the oven cavity.
  • the microwave source is a magnetron.
  • FIG 1 shows a schematic sectional view of a feed box system according to a preferred embodiment of the present invention.
  • the feed box system is arranged within a microwave oven.
  • the feed box system includes a primary feed box 10 and a secondary feed box 12.
  • the primary feed box 10 and the secondary feed box 12 are arranged one upon the other at a top wall 14 of an oven cavity 16.
  • the primary feed box 10 and the secondary feed box 12 are substantially formed as cuboids.
  • the secondary feed box 12 is arranged directly above an oven cavity 16.
  • the base area of the secondary feed box 12 may be rectangular, circular or square.
  • the primary feed box 10 is arranged directly above the secondary feed box 12.
  • the width of the primary feed box 10 is smaller than the width of the secondary feed box 12.
  • the circumference of the primary feed box 10 is smaller than the circumference of the secondary feed box 12.
  • the feed box system is arranged on a top wall 14 of the oven cavity 16.
  • the feed box system may be arranged at a side wall of the oven cavity 16.
  • the secondary feed box 12 is formed out of the top wall 14 or side wall of the oven cavity 16, respectively, by an embossing or by a deep-drawing.
  • the primary feed box 10 is fixed to the secondary feed box 12 and covers a recess of said secondary feed box 12.
  • the primary feed box 10 is welded, screwed, clinched or riveted to the secondary feed box 12.
  • the overlapping portions 22 of the primary feed box 10 and the secondary feed box 12 comprise multiple grooves extending along the circumference of the recess in the secondary feed box 12.
  • the overlapping portions 22 of the primary feed box 10 and of the secondary feed box 12 have an S-shaped or meander-shaped cross-section.
  • the overlapping portions 22 of the primary feed box 10 and of the secondary feed box 12 are complementary to each other, so that said overlapping portions form a wave labyrinth 22.
  • Said wave labyrinth 22 encloses the common portion of the primary feed box 10 and the secondary feed box 12 completely or at least partially.
  • the top wall 14 of the oven cavity 14 as well as the secondary feed box 12 is coated.
  • the primary feed box 10 is fixed to the secondary feed box 12 after the enamel process.
  • the primary feed box 10 is not coated by the enamel process.
  • further walls of the oven cavity 16 may be enamelled.
  • each wall of the oven cavity 14 and the secondary feed box 12 may be coated by the enamel process.
  • a magnetron 18 is attached at the outer side of the primary feed box 10.
  • An antenna 20 of the magnetron 18 extends into the interior of the primary feed box 10.
  • the direction 26 of the antenna 20 extends orthogonal to a normal vector 28 of the top wall 14 of the oven cavity 16.
  • the direction 26 of the antenna 20 of the inventive feed box system extends along another axis as the normal vector 28 of the cavity wall 14, at which said feed box system is arranged.
  • stirrer 24 Within the secondary feed box 12 a stirrer 24 is arranged.
  • the stirrer 24 is rotatable around a vertical rotation axis 30.
  • An axle 32 of the stirrer 24 penetrates a top wall of the secondary feed box 12.
  • the stirrer 24 is arranged within the secondary feed box 12.
  • the stirrer 24 can extend at least partially into the interior of the oven cavity 16.
  • the microwave oven with the feed box system according to the present invention requires less material as in the prior art due to the embossing or deep-drawing the secondary feed box 12 out of the oven cavity 16.
  • a wave-tight connection between the primary feed box 10 and the secondary feed box 12 can be easily realized.
  • the connection between the primary feed box 10 and the secondary feed box 12 needs only a few screws or bolts.
  • the present invention allows a low cost production of the microwave oven with the feed box system.
  • connection between the primary feed box 10 and the secondary feed box 12 allows a good electrical contact between the wave source and the feed box system.
  • the embossing and/or deep-drawing of the secondary feed box 12 out of the oven cavity 16 allow an increased stiffness of the oven cavity 16.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electric Ovens (AREA)
EP09006048.4A 2009-05-02 2009-05-02 Mikrowellenherd mit einem Vorschubkastensystem Not-in-force EP2265090B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP09006048.4A EP2265090B1 (de) 2009-05-02 2009-05-02 Mikrowellenherd mit einem Vorschubkastensystem

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09006048.4A EP2265090B1 (de) 2009-05-02 2009-05-02 Mikrowellenherd mit einem Vorschubkastensystem

Publications (2)

Publication Number Publication Date
EP2265090A1 true EP2265090A1 (de) 2010-12-22
EP2265090B1 EP2265090B1 (de) 2017-12-20

Family

ID=41168701

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09006048.4A Not-in-force EP2265090B1 (de) 2009-05-02 2009-05-02 Mikrowellenherd mit einem Vorschubkastensystem

Country Status (1)

Country Link
EP (1) EP2265090B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2784395A1 (de) * 2013-03-25 2014-10-01 Electrolux Appliances Aktiebolag Ofeninnnenraum für einen Kochherd

Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3939320A (en) 1974-04-12 1976-02-17 Micro-Tronics, Inc. Beam stirrer
US4159406A (en) * 1977-05-31 1979-06-26 Whirlpool Corporation Waveguide assembly for microwave oven
GB2107160A (en) * 1981-06-16 1983-04-20 Sharp Kk Microwave ovens
JPS6172936A (ja) * 1984-09-14 1986-04-15 Matsushita Electric Ind Co Ltd 電子レンジ
EP0186104A2 (de) * 1984-12-20 1986-07-02 Matsushita Electric Industrial Co., Ltd. Mikrowellenherd
US4701586A (en) * 1986-05-30 1987-10-20 Litton Systems, Inc. Magnetron mounting system
DE3147044C2 (de) 1981-11-27 1987-12-17 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt, De
US4808784A (en) * 1987-03-14 1989-02-28 Sam Sung Electronic Co., Ltd. High frequency dispersing device in a microwave oven
GB2267634A (en) * 1992-06-01 1993-12-08 Matsushita Electric Industrial Co Ltd Microwave oven with electromagnetic wave distributor
US5825000A (en) 1996-08-31 1998-10-20 Daewoo Electronics Co., Ltd. Wave guide system of a microwave oven
GB2331687A (en) * 1997-11-22 1999-05-26 Samsung Electronics Co Ltd Microwave oven with drainage holes
US6246039B1 (en) * 1999-02-19 2001-06-12 Sanyo Electric Co., Ltd. High frequency heating apparatus having a wave guide introducing microwaves into heating chamber
JP2005011620A (ja) * 2003-06-18 2005-01-13 Matsushita Electric Ind Co Ltd 電子レンジ
EP2037180A1 (de) * 2007-09-14 2009-03-18 Teka Portugal, S.A. Einbau-Küchengerät

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3939320A (en) 1974-04-12 1976-02-17 Micro-Tronics, Inc. Beam stirrer
US4159406A (en) * 1977-05-31 1979-06-26 Whirlpool Corporation Waveguide assembly for microwave oven
GB2107160A (en) * 1981-06-16 1983-04-20 Sharp Kk Microwave ovens
DE3147044C2 (de) 1981-11-27 1987-12-17 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt, De
JPS6172936A (ja) * 1984-09-14 1986-04-15 Matsushita Electric Ind Co Ltd 電子レンジ
EP0186104A2 (de) * 1984-12-20 1986-07-02 Matsushita Electric Industrial Co., Ltd. Mikrowellenherd
US4701586A (en) * 1986-05-30 1987-10-20 Litton Systems, Inc. Magnetron mounting system
US4808784A (en) * 1987-03-14 1989-02-28 Sam Sung Electronic Co., Ltd. High frequency dispersing device in a microwave oven
GB2267634A (en) * 1992-06-01 1993-12-08 Matsushita Electric Industrial Co Ltd Microwave oven with electromagnetic wave distributor
US5825000A (en) 1996-08-31 1998-10-20 Daewoo Electronics Co., Ltd. Wave guide system of a microwave oven
GB2331687A (en) * 1997-11-22 1999-05-26 Samsung Electronics Co Ltd Microwave oven with drainage holes
US6246039B1 (en) * 1999-02-19 2001-06-12 Sanyo Electric Co., Ltd. High frequency heating apparatus having a wave guide introducing microwaves into heating chamber
JP2005011620A (ja) * 2003-06-18 2005-01-13 Matsushita Electric Ind Co Ltd 電子レンジ
EP2037180A1 (de) * 2007-09-14 2009-03-18 Teka Portugal, S.A. Einbau-Küchengerät

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2784395A1 (de) * 2013-03-25 2014-10-01 Electrolux Appliances Aktiebolag Ofeninnnenraum für einen Kochherd

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