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EP1083772B1 - Antenne für Mikrowellenofen - Google Patents

Antenne für Mikrowellenofen Download PDF

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Publication number
EP1083772B1
EP1083772B1 EP20000402442 EP00402442A EP1083772B1 EP 1083772 B1 EP1083772 B1 EP 1083772B1 EP 20000402442 EP20000402442 EP 20000402442 EP 00402442 A EP00402442 A EP 00402442A EP 1083772 B1 EP1083772 B1 EP 1083772B1
Authority
EP
European Patent Office
Prior art keywords
antenna
cavity
shaft
emitter surface
oven
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP20000402442
Other languages
English (en)
French (fr)
Other versions
EP1083772A1 (de
Inventor
Claudy Thomson-CSF P.I. Dept. Brevets Bellion
Antoine Thomson-CSF P.I. Dept. Brevets Boutin
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.)
FagorBrandt SAS
Original Assignee
FagorBrandt SAS
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 FagorBrandt SAS filed Critical FagorBrandt SAS
Publication of EP1083772A1 publication Critical patent/EP1083772A1/de
Application granted granted Critical
Publication of EP1083772B1 publication Critical patent/EP1083772B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H05B6/74—Mode transformers or mode 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
    • H05B6/72—Radiators or antennas
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/72—Radiators or antennas
    • H05B6/725—Rotatable antennas

Definitions

  • the invention proposes to achieve a homogeneous heating of the food, without resorting to the presence of a rotating plate in the cavity.
  • the invention provides an antenna for homogenizing the distribution of microwaves in the cavity.
  • an antenna comprising a conductive axis and a conductive emitting surface connected to one end of the axis, characterized in that the antenna comprises a dielectric junction binding the axis and the emitting surface so as to establish an electrical discontinuity between the axis and the emitting surface and in that the emitting surface does not have a symmetry of revolution about the mean direction of the axis.
  • the axis 1 is preferably distant from the end of the waveguide 6 located on the opposite side to that of the magnetron 5, d a distance substantially equal to one eighth of the average wavelength of the microwaves in the waveguide 6, so that a maximum of energy can be received in the waveguide 6 and then reemitted in the cavity 7 by the antenna.
  • the length of the part of the axis 1 located outside the waveguide 6 is greater than or substantially equal to the length of the portion of the axis 1 located in the waveguide 6. In this way, most of the energy received by the antenna in the waveguide 6 is radiated by the antenna in the cavity 7.
  • the radiating slot 4 then appears as a "hole” in this annex waveguide 60, a hole which rerayes part of the
  • the wall 70 is advantageously the lower wall of the cavity 7.
  • the axis 1 is preferably perpendicular to the wall 70 so as to allow a more homogeneous distribution of the waves radiated by the beam. 'antenna.
  • the axis 1 is preferably perpendicular to the direction X of the length of the waveguide 6 connecting the magnetron 5 to the cavity 7.
  • the X and Y directions respectively correspond to the horizontal and the vertical on the Figures 2A and 2B .
  • the oven also comprises for example a plate 8 supporting a food 9. These are located in such a way that the energy radiated by the antenna is at least partially directed towards the food 9.
  • the antenna according to the invention is advantageously located in the lower part of the cavity 7, heating the food 9 directly, mainly from below. The reflections of the waves on the walls of the cavity 7 also allow the food 9 to be heated from above.
  • the cavity 7 has a bottom wall 70, an upper wall 72 and side walls 71.
  • the cavity 7 may also advantageously comprise a complementary antenna 10, for example of the conventional type, that is to say all metal, located in the upper part of the cavity 7 so as to optionally heat or cook the food 9 directly on both sides, from above and from below.
  • the complementary antenna is then preferably located at the upper wall 72 of the cavity 7.
  • the complementary antenna 10 allows, if necessary, to achieve a cooking "two levels", that is to say a simultaneous cooking two foods each placed on a separate baking tray; when there is only one antenna, one of the foods may, under certain conditions, mask the other food.
  • This complementary antenna 10 may be powered by another magnetron, not shown here.
  • the rotation speed is substantially constant and is worth a few tens of revolutions per minute, advantageously of the order of thirty revolutions per minute.
  • An antenna rotation speed that is too low can result in insufficient homogenization of the distribution of microwaves in the cavity 7, whereas a too high rotational speed may end up obscuring the slot 4 and thus also damage the cavity. homogenizing the distribution of microwaves in the cavity 7.
  • the rotation of the antenna which does not have symmetry of revolution about its axis 1, constantly disturbs over time the waves in the cavity 7 and homogenizes their distribution in the cavity 7 by disturbing the establishment of a standing wave regime in the cavity, which regime would still include hot spots and cold spots.
  • the Figure 2B schematically represents an enlarged detail of the Figure 2A that is, the region of the furnace surrounding the antenna according to the invention. Represented is a portion of the waveguide 6 and a portion of the cavity 7. All the numerical values which follow relate to a preferred embodiment.
  • the width I 1 of the waveguide 6 is substantially 14 mm.
  • the thickness e 1 of the bottom wall 70 of the cavity 7 is substantially 1.6 mm.
  • the width I 2 of the annex waveguide 60 is substantially 12 mm.
  • the diameter D of the emitting surface 2 is substantially 110 mm. It is better to avoid taking a diameter D too close to the average wavelength of microwaves in the air, here about 122mm, because the efficiency of the antenna is then decreased.
  • the thickness e 2 of the emitting surface is substantially 1 mm.
  • the emitting surface 2 represented on the Figure 2B is shaped like a crown and the distance d 2 in the direction X between the inside of the ring and the axis 1 is substantially 8 mm while the distance d 3 in the direction Y between the inside of the ring and the axis 1 is substantially 1 mm.
  • the distance d 1 in the direction of the direction Y between the axis 1 and the wall of the waveguide 6 is substantially 3 mm.
  • the average wavelength of the microwaves in the waveguide 6 is about 168mm
  • the distance d 4 in the direction of the Y direction between the axis 1 and the end of the waveguide 6 located on the opposite side magnetron 5 is about 20mm, about one-eighth of the average wavelength of the microwaves in the waveguide 6.
  • the antenna according to the invention comprises a dielectric junction 3, which allows a better distribution of microwaves at the antenna and hence a better homogenization of the distribution of microwaves in the cavity 7. If the antenna was entirely metallic as in the prior art, the waves would be radiated mainly in the direction X which is the direction of the length of the waveguide 6 connecting the magnetron 5 to the cavity 7.
  • the antenna is rotatable around its axis 1.
  • the different parts of the antenna are immobile relative to each other, and the axis 1 rotates around itself causing the emitting surface 2 in its rotation.
  • the axis 1 can also be fixed relative to the oven while the rest of the antenna rotates about the axis 1. In the latter case, the axis 1 is for example hollow and the emitting surface 2 is then linked to the axis 1 by a dielectric junction 3 comprising an axial portion rotatable and located in the hollow of the axis 1.
  • FIGS. 3A to 3D schematically represent a top view respectively of a first, a second, a third, and a fourth preferred embodiment of the emitting surface of an antenna according to the invention.
  • the FIGS. 3A to 3C have different emitting surfaces 2 having different radiating slots 4.
  • the 3D figure represents an emitting surface 2 having no radiating slot but rather a fin 20 as a disturbing element of the waves located in the cavity 7.
  • the straight line ⁇ 1 is perpendicular to the line joining the center 41 to the center of gravity 10.
  • the radiation of such a slot is more homogeneous than the radiation of a slot whose length is parallel to the line joining the center 41 at the center of gravity 10.
  • This slot of length parallel to the ray of the emitting surface 2 would have decreasing intensity radiation from the center of the emitting surface 2 to its edge 21, while the radiation of a slot intersecting the rays of the emitting surface 2 as on the figure 3A is substantially constant over the entire surface of the slot 4.
  • the band of conductive material separating the inner circle 22 of the ring from the periphery of the slot 4 should be wide enough to avoid excessive heating at this level: in practice a few millimeters are enough.
  • the length L f of the slot 4 is substantially 60 mm while its width l f is substantially 10 mm.
  • the figure 3C represents an emitting surface 2 having a truncated point 43 V-shaped radiating slot 4, the extensions 42 of the two branches of the V passing substantially through the center of gravity 10 of the emitting surface 2.
  • the constraints concerning the distance b remain the same only for Figures 3A and 3B .
  • the angle between them the two branches 42 of the V allow the slot to pass a range of microwave frequencies wider than allows a rectangular slot shape, however the determination of the parameters of the V shape remains more critical than that corresponding to a rectangular shape.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Constitution Of High-Frequency Heating (AREA)

Claims (19)

  1. Antenne mit einer leitenden Achse (1) und einer leitenden Sendefläche (2), die mit einem Ende (11) der Achse (1) verbunden ist, wobei die Sendefläche (2) keine Rotationssymetrie um die mittlere Richtung (ΔM) der Achse (1) aufweist, dadurch gekennzeichnet, dass die Antenne eine dielektrische Verbindung (3) aufweist, die die Achse (1) mit der Sendefläche (2) verbindet, so dass eine elektrische Diskontinuität zwischen der Achse (1) und der Sendefläche (2) entsteht.
  2. Antenne nach Anspruch 1, dadurch gekennzeichnet, dass die Sendefläche (2) eine abgerundete Form hat.
  3. Antenne nach Anspruch 2, dadurch gekennzeichnet, dass die Sendefläche (2) scheiben- oder kranzförmig ist.
  4. Antenne nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Achse (1) vollständig auf ein und derselben Seite der Sendefläche (2) angeordnet ist.
  5. Antenne nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Sendefläche (2) mindestens einen strahlenden Schlitz (4) aufweist.
  6. Antenne nach Anspruch 5, dadurch gekennzeichnet, dass der strahlende Schlitz (4) im Wesentlichen rechteckig ist.
  7. Antenne nach einem der Ansprüche 5 bis 6, dadurch gekennzeichnet, dass der strahlende Schlitz (4) länglich ist und dass die Richtung (Δ1) der Länge des Schlitzes im Wesentlichen senkrecht zur Gerade ist, die die Mitte (41) des Schlitzes (4) mit dem Schwerpunkt (10) des Endes (11) der mit der Sendefläche (2) verbundenen Achse (1) verbindet.
  8. Antenne nach Anspruch 5, dadurch gekennzeichnet, dass der strahlende Schlitz (4) die Form eines V mit kegelstumpfförmiger Spitze (43) hat, wobei die Verlängerung der beiden Schenkel (42) des V im Wesentlichen durch den Schwerpunkt (10) der Sendefläche (2) hindurchgeht.
  9. Antenne nach einem der Ansprüche 5 bis 8, dadurch gekennzeichnet, dass die Sendefläche (2) zwei strahlende Schlitze (4) aufweist, die zueinander nicht parallel sind.
  10. Antenne nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Sendefläche (2) mindestens einen Flügel (20) aufweist.
  11. Mikrowellenherd mit einem Mikrowellensender (5), einem Garraum (7), einem Wellenleiter (6), der den Sender (5) mit dem Garraum (7) verbindet, einer Antenne nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, dass die Achse (1) teilweise im Wellenleiter (6) liegt, dass die Sendefläche (2) im Garraum (7) liegt und um die Achse (1) drehbeweglich ist, wobei die Sendefläche (2) keine Rotationssymetrie um die mittlere Richtung (ΔM) der Achse (1) aufweist, um die stehenden Wellen zu stören, die im Garraum (7) vorhanden sein können.
  12. Mikrowellenherd nach Anspruch 11, wobei die Sendefläche (2) einen strahlende Schlitz (4) aufweist, dadurch gekennzeichnet, dass der Umfang (p) des strahlenden Schlitzes (4) im Wesentlichen gleich der mittleren Wellenlänge in der Luft der im Garraum (7) des Herdes befindlichen Mikrowellen ist.
  13. Mikrowellenherd nach Anspruch 12, dadurch gekennzeichnet, dass alle Punkte des Umfangs (p) des strahlenden Schlitzes (4) vom Schwerpunkt (10) des Endes (11) der Achse (1), die mit der Sendefläche (2) verbunden ist, um einen Abstand entfernt sind, der größer als oder im Wesentlichen so groß wie das Achtel der mittleren Wellenlänge in der Luft der vom Wellenleiter (6) übertragenen Mikrowellen ist.
  14. Mikrowellenherd nach einem der Ansprüche 11 bis 13, dadurch gekennzeichnet, dass die Länge (h1) des außerhalb des Wellenleiters (6) liegenden Teils der Achse (1) größer als oder im Wesentlichen so groß wie die Länge (h2) des im Wellenleiter (6) liegenden Teils der Achse (1) ist.
  15. Mikrowellenherd nach einem der Ansprüche 11 bis 14, dadurch gekennzeichnet, dass die Drehgeschwindigkeit der Antenne im Betrieb einige zehn Drehungen je Minute beträgt.
  16. Mikrowellenherd nach einem der Ansprüche 11 bis 15, dadurch gekennzeichnet, dass sich die Antenne in der Mitte des unteren Teils des Garraums (7) befindet.
  17. Mikrowellenherd nach einem der Ansprüche 11 bis 16, dadurch gekennzeichnet, dass der Herd ein Haushaltsherd ist.
  18. Mikrowellenherd nach Anspruch 17, dadurch gekennzeichnet, dass der Herd auch einen Drehteller für Lebensmittel aufweist.
  19. Mikrowellenherd nach einem der Ansprüche 11 bis 16, dadurch gekennzeichnet, dass der Herd ein Industrietrockenofen ist.
EP20000402442 1999-09-10 2000-09-05 Antenne für Mikrowellenofen Expired - Lifetime EP1083772B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9911375 1999-09-10
FR9911375A FR2798549B1 (fr) 1999-09-10 1999-09-10 Antenne pour four a micro ondes

Publications (2)

Publication Number Publication Date
EP1083772A1 EP1083772A1 (de) 2001-03-14
EP1083772B1 true EP1083772B1 (de) 2009-09-02

Family

ID=9549746

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20000402442 Expired - Lifetime EP1083772B1 (de) 1999-09-10 2000-09-05 Antenne für Mikrowellenofen

Country Status (4)

Country Link
EP (1) EP1083772B1 (de)
DE (1) DE60042870D1 (de)
ES (1) ES2332401T3 (de)
FR (1) FR2798549B1 (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4024145B2 (ja) * 2002-12-27 2007-12-19 三洋電機株式会社 電子レンジ
KR100565657B1 (ko) * 2004-02-19 2006-03-30 엘지전자 주식회사 전자레인지
JP5467330B2 (ja) * 2009-02-27 2014-04-09 パナソニック株式会社 マイクロ波加熱装置
WO2013021369A2 (en) * 2012-12-13 2013-02-14 Zhylkov Valerii Stepanovich Microwave oven
WO2019201616A1 (de) 2018-04-20 2019-10-24 BSH Hausgeräte GmbH Mikrowellen-drehantenne für ein haushalts-mikrowellengerät sowie haushalts-mikrowellengerät
DE102019209074A1 (de) * 2019-06-24 2020-12-24 BSH Hausgeräte GmbH Haushalts-Mikrowellengerät mit Drehantenne

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1134449A (en) * 1978-12-01 1982-10-26 John M. Osepchuk Microwave oven having rotating conductive radiators
US4430538A (en) * 1980-08-28 1984-02-07 Tokyo Shibaura Denki Kabushiki Kaisha High-frequency heating device
US4642435A (en) * 1985-12-26 1987-02-10 General Electric Company Rotating slot antenna arrangement for microwave oven
AU666616B2 (en) * 1993-06-30 1996-02-15 Sanyo Electric Co., Ltd. Microwave oven including antenna for radiating microwave

Also Published As

Publication number Publication date
DE60042870D1 (de) 2009-10-15
EP1083772A1 (de) 2001-03-14
ES2332401T3 (es) 2010-02-04
FR2798549A1 (fr) 2001-03-16
FR2798549B1 (fr) 2002-01-11

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