WO2017081855A1 - Dispositif de chauffage à microondes - Google Patents

Dispositif de chauffage à microondes Download PDF

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Publication number
WO2017081855A1
WO2017081855A1 PCT/JP2016/004790 JP2016004790W WO2017081855A1 WO 2017081855 A1 WO2017081855 A1 WO 2017081855A1 JP 2016004790 W JP2016004790 W JP 2016004790W WO 2017081855 A1 WO2017081855 A1 WO 2017081855A1
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WO
WIPO (PCT)
Prior art keywords
electromagnetic field
field distribution
microwave
adjusting device
distribution adjusting
Prior art date
Application number
PCT/JP2016/004790
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English (en)
Japanese (ja)
Inventor
大森　義治
吉野　浩二
橋本　修
良介 須賀
Original Assignee
パナソニック株式会社
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.)
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Publication date
Application filed by パナソニック株式会社 filed Critical パナソニック株式会社
Priority to JP2017549981A priority Critical patent/JP6874687B2/ja
Publication of WO2017081855A1 publication Critical patent/WO2017081855A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/14—Reflecting surfaces; Equivalent structures
    • 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

Definitions

  • the present disclosure relates to a microwave heating device including an electromagnetic field distribution adjusting device.
  • Patent Documents 1 and 2 are typical techniques for uniformly heating an object to be heated in the field of microwave heating devices such as a microwave oven.
  • FIG. 7 is a cross-sectional view of the microwave oven described in Patent Document 1.
  • a turntable 25 is installed in the heating chamber 21.
  • the heated object 24 on the turntable 25 also rotates.
  • the microwave generated by the magnetron 22 is supplied into the heating chamber 21 through the waveguide 23.
  • FIG. 8 is a cross-sectional view of the microwave oven described in Patent Document 2.
  • the rotating antenna 26 is disposed below the mounting table on which the object to be heated 24 is mounted.
  • the microwave generated by the magnetron 22 propagates through the waveguide 23 and reaches the rotating antenna 26.
  • the rotating antenna 26 radiates microwaves into the heating chamber 21 while rotating.
  • the conventional microwave heating apparatus has a problem that heating is not uniform.
  • a microwave heating apparatus includes a heating chamber that accommodates an object to be heated, a microwave generation unit that generates a microwave having a specified frequency, and a microwave A power feeding unit for supplying waves to the heating chamber, an electromagnetic field distribution adjusting device provided in a two-dimensional region of at least a part of the wall surface of the heating chamber, and a control unit for specifying a plurality of frequencies for the microwave generating unit, Is provided.
  • the electromagnetic field distribution adjusting device has a ground conductor provided in a two-dimensional region of at least a part of the wall surface of the heating chamber, and a plurality of metal pieces arranged two-dimensionally and periodically in parallel to the ground conductor.
  • the electromagnetic field distribution adjusting device When the microwave having a predetermined frequency is supplied, the electromagnetic field distribution adjusting device has substantially infinite impedance in the vicinity thereof.
  • the electromagnetic field distribution adjusting device has a substantially zero impedance in the vicinity thereof when supplied with a microwave having another predetermined frequency.
  • the microwave heating device of this aspect can change the impedance of the electromagnetic field distribution adjusting device according to the frequency of the supplied microwave. This makes it possible to move the position of the nodes and antinodes of the standing wave reflected and generated by the electromagnetic field distribution adjusting device. As a result, uneven heating can be reduced.
  • FIG. 1 is a perspective view of a microwave heating apparatus according to Embodiment 1.
  • FIG. FIG. 2 is a cross-sectional view of the microwave heating apparatus according to the first embodiment.
  • FIG. 3A is a perspective view showing a part of the electromagnetic field distribution adjusting device according to Embodiment 1.
  • FIG. 3B is a perspective view showing a part of the electromagnetic field distribution adjusting device according to the modification of the first embodiment.
  • FIG. 4A is a diagram illustrating a frequency characteristic regarding a phase shift of a reflected wave by the electromagnetic field distribution adjusting device.
  • FIG. 4B is a diagram illustrating frequency characteristics related to dielectric loss by the electromagnetic field distribution adjusting device.
  • FIG. 5A is a diagram illustrating a standing wave generated by being reflected by an electromagnetic field distribution adjusting device functioning as an electric wall.
  • FIG. 5B is a diagram showing a standing wave generated by being reflected by the electromagnetic field distribution adjusting device functioning as a magnetic wall.
  • FIG. 6A is a perspective view showing a part of the electromagnetic field distribution adjusting apparatus according to Embodiment 2.
  • FIG. 6B is a perspective view showing a part of the electromagnetic field distribution adjusting device according to the modification of the second embodiment.
  • FIG. 7 is a cross-sectional view of a conventional microwave oven.
  • FIG. 8 is a cross-sectional view of a conventional microwave oven.
  • the microwave heating apparatus includes a heating chamber that accommodates an object to be heated, a microwave generation unit that generates a microwave having a specified frequency, and a power supply that supplies the microwave to the heating chamber. And an electromagnetic field distribution adjusting device provided in at least a part of the two-dimensional region of the wall surface of the heating chamber, and a control unit that designates a plurality of frequencies for the microwave generation unit.
  • the electromagnetic field distribution adjusting device has a ground conductor provided in a two-dimensional region of at least a part of the wall surface of the heating chamber, and a plurality of metal pieces arranged two-dimensionally and periodically in parallel to the ground conductor.
  • the electromagnetic field distribution adjusting device When the microwave having a predetermined frequency is supplied, the electromagnetic field distribution adjusting device has substantially infinite impedance in the vicinity thereof.
  • the electromagnetic field distribution adjusting device has a substantially zero impedance in the vicinity thereof when supplied with a microwave having another predetermined frequency.
  • the microwave heating device of this aspect can change the impedance of the electromagnetic field distribution adjusting device according to the frequency of the supplied microwave. This makes it possible to move the position of the nodes and antinodes of the standing wave reflected and generated by the electromagnetic field distribution adjusting device. As a result, uneven heating can be reduced.
  • the control unit is configured to designate a frequency other than the resonance frequency of the electromagnetic field distribution adjusting device. According to this aspect, it is possible to suppress a decrease in heating efficiency.
  • the electromagnetic field distribution adjusting device includes a plurality of switches provided between two adjacent metal pieces in the plurality of metal pieces. It has further.
  • the microwave heating device of this aspect can change the impedance of the electromagnetic field distribution adjusting device according to the opening / closing of a plurality of switches regardless of the frequency of the supplied microwave.
  • the electromagnetic field distribution adjustment device further includes a plurality of metal columns that respectively connect the plurality of metal pieces and the ground conductor. .
  • the microwave heating device of this aspect can change the impedance of the electromagnetic field distribution adjusting device according to the frequency of the supplied microwave.
  • the electromagnetic field distribution adjusting device further includes a dielectric provided between the plurality of metal pieces and the ground conductor.
  • the microwave heating device of this aspect can change the impedance of the electromagnetic field distribution adjusting device according to the frequency of the supplied microwave.
  • (Embodiment 1) 1 and 2 are a perspective view and a cross-sectional view, respectively, of a microwave oven that is a microwave heating apparatus according to Embodiment 1 of the present disclosure.
  • an oscillator 2 is installed above the top surface of the heating chamber 1.
  • the oscillator 2 is composed of a magnetron or a solid oscillation element, and can generate a microwave having an arbitrary frequency in a predetermined frequency band.
  • the control unit 9 designates two predetermined frequencies (first frequency (f1) and second frequency (f2)).
  • the oscillator 2 is configured to generate a microwave having a frequency specified by the control unit 9.
  • the antenna 3 is installed near the top surface in the heating chamber 1 and supplies the microwave generated by the oscillator 2 into the heating chamber 1.
  • the oscillator 2 corresponds to a microwave generation unit
  • the antenna 3 corresponds to a power feeding unit.
  • the electromagnetic field distribution adjusting device 5 is provided on the bottom surface of the heating chamber 1.
  • the object to be heated 4 is placed on the electromagnetic field distribution adjusting device 5.
  • the electromagnetic field distribution adjusting device 5 can change the electric field distribution in the vicinity thereof by changing the impedance of the surface. Thereby, the heating distribution of the to-be-heated material 4 can be changed, and the to-be-heated material 4 can be heated uniformly.
  • FIG. 3A is a perspective view showing a part of the electromagnetic field distribution adjusting device 5 according to the present embodiment.
  • the electromagnetic field distribution adjusting device 5 includes a metal piece 10, a metal column 11, and a ground conductor 12, and is provided in a predetermined two-dimensional region in the heating chamber 1 shown in FIG.
  • the predetermined two-dimensional region is the entire bottom surface of the heating chamber 1.
  • the predetermined two-dimensional region may be another wall surface (for example, a side wall) instead of the bottom surface, or may be a part instead of the whole.
  • the ground conductor 12 is provided in parallel to the bottom surface of the heating chamber 1 (see FIGS. 1 and 2).
  • the ground conductor 12 corresponds to the bottom surface of the electromagnetic field distribution adjusting device 5 and has a reference potential.
  • the metal piece 10 includes a plurality of metal pieces arranged two-dimensionally and periodically in parallel with the ground conductor 12.
  • Each metal piece of the metal piece 10 is a rectangular metal flat plate whose one side has a length equal to or less than half the wavelength of an electromagnetic wave having an operating frequency for microwave heating, for example.
  • To arrange two-dimensionally and periodically means to arrange a plurality of identical structures at regular intervals both vertically and horizontally.
  • the metal pillar 11 includes a plurality of metal pillars that connect each metal piece of the metal piece 10 to the ground conductor 12.
  • a combination of one metal piece and one metal column is called a unit cell having a mushroom structure.
  • the electromagnetic field distribution adjustment apparatus 5 comprises the metamaterial (Meta-material) by which many unit cells were arranged two-dimensionally and periodically.
  • FIG. 3B is a perspective view showing a part of the electromagnetic field distribution adjusting device 5 according to a modification of the present embodiment. Unlike the electromagnetic field distribution adjusting device 5 shown in FIG. 3A, the electromagnetic field distribution adjusting device 5 according to the present modification has a dielectric 15 disposed between the metal piece 10 and the ground conductor 12 instead of the metal pillar 11.
  • the electromagnetic field distribution adjusting device 5 according to the present modification has a dielectric 15 disposed between the metal piece 10 and the ground conductor 12 instead of the metal pillar 11.
  • FIG. 4A shows frequency characteristics regarding the phase shift of the reflected wave by the electromagnetic field distribution adjusting device 5.
  • FIG. 4B shows frequency characteristics regarding dielectric loss by the electromagnetic field distribution adjusting device 5.
  • the electromagnetic field distribution adjusting device 5 functions as a magnetic wall having substantially infinite impedance.
  • the phase of the reflected wave is shifted by approximately 180 degrees from the phase of the original microwave.
  • the electromagnetic field distribution adjusting device 5 functions as an electric wall having substantially zero impedance.
  • the electromagnetic field distribution adjusting device 5 functions as a magnetic wall or an electric wall by switching the frequency of the supplied microwave.
  • FIG. 5A shows a standing wave 14a generated by being reflected by the electromagnetic field distribution adjusting device 5 functioning as an electric wall. As shown in FIG. 5A, the microwave forms a standing wave having a node on the surface of the metal piece 10.
  • FIG. 5B shows a standing wave 14b generated by reflection by the electromagnetic field distribution adjusting device 5 functioning as a magnetic wall. As shown in FIG. 5B, the microwave forms a standing wave having an antinode on the surface of the metal piece 10.
  • the dielectric loss due to the electromagnetic field distribution adjusting device 5 changes according to the frequency of the microwave and becomes maximum at the resonance frequency fr.
  • a frequency close to fr is selected as the frequency f2, unlike both f1 and fr (see FIG. 4B).
  • the electromagnetic field distribution adjusting device 5 can suppress a decrease in heating efficiency.
  • the electromagnetic field distribution adjusting device 5 further functions as a magnetic wall, although it is incomplete, and can suppress the phase shift of the reflected wave.
  • the impedance of the electromagnetic field distribution adjusting device 5 can be changed according to the frequency of the supplied microwave. As a result, the positions of the nodes and antinodes of the standing waves that are reflected by the electromagnetic field distribution adjusting device 5 can be moved. As a result, uneven heating can be reduced.
  • FIG. 6A is a perspective view illustrating a part of the electromagnetic field distribution adjustment device 5 according to Embodiment 2 of the present disclosure.
  • the electromagnetic field distribution adjusting device 5 in addition to the configuration shown in FIG. 3A, includes a switch 13.
  • the switch 13 is provided between two adjacent metal pieces in the metal piece 10, and includes a plurality of switches composed of transistors, for example.
  • the electromagnetic field distribution adjusting device 5 forms a metamaterial in which a large number of mushroom unit cells are arranged two-dimensionally and periodically.
  • the electromagnetic field distribution adjusting device 5 functions as an electric wall for the microwave having the frequency f1 and functions as a magnetic wall for the microwave having the resonance frequency fr, similarly to the configuration shown in FIG. 3A.
  • the electromagnetic field distribution adjusting device 5 functions as an electric wall having substantially zero impedance in the vicinity of the short-circuit surface.
  • the impedance in the vicinity of the electromagnetic field distribution adjusting device 5 can be changed according to the opening / closing of the switch 13 regardless of the frequency of the supplied microwave. As a result, the positions of the nodes and antinodes of the standing waves that are reflected by the electromagnetic field distribution adjusting device 5 can be moved.
  • the switch 13 may be an element having breakdown voltage characteristics such as a Zener diode.
  • a predetermined threshold value breakdown voltage
  • breakdown voltage is applied to two metal pieces connected to both ends of one switch due to electromagnetic waves arriving near each switch of the switch 13.
  • the electromagnetic field distribution adjusting device 5 automatically switches the impedance to substantially zero in a portion where the electromagnetic field is strong, thereby generating a standing wave node in this portion and weakening the electromagnetic field. Thereby, uneven heating can be automatically suppressed.
  • FIG. 6B is a perspective view showing a part of the electromagnetic field distribution adjusting device 5 according to a modification of the present embodiment. Unlike the electromagnetic field distribution adjusting device 5 shown in FIG. 6A, the electromagnetic field distribution adjusting device 5 according to the present modification has a dielectric 15 disposed between the metal piece 10 and the ground conductor 12 instead of the metal pillar 11.
  • the electromagnetic field distribution adjusting device 5 according to the present modification has a dielectric 15 disposed between the metal piece 10 and the ground conductor 12 instead of the metal pillar 11.
  • the electromagnetic field distribution adjusting device according to the present disclosure can be applied to other heating devices using dielectric heating, such as a garbage disposal machine.

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

Abstract

La présente invention concerne un dispositif de chauffage à microondes comprenant : une chambre de chauffage (1) contenant un objet (4) à chauffer ; une unité de génération de microondes (2) qui génère des microondes ayant une fréquence spécifiée ; une unité d'alimentation électrique (3) qui fournit des microondes à la chambre de chauffage ; un dispositif de réglage de distribution de champ électromagnétique (5) disposé dans au moins une partie d'une zone bidimensionnelle sur une surface de paroi de la chambre de chauffage (1) ; et une unité de commande (9) qui spécifie une pluralité de fréquences pour l'unité de génération de microondes (2). Le dispositif de réglage de distribution de champ électromagnétique (5) comprend : un conducteur de masse disposé dans la zone bidimensionnelle ; et une pluralité de pièces métalliques agencées de manière bidimensionnelle et périodique, et parallèles au conducteur de masse. Ce dispositif de chauffage à microondes est capable de changer l'impédance du dispositif de réglage de distribution de champ électromagnétique (5) selon la fréquence des microondes fournies. Il en résulte que les positions des nœuds et des ventres des ondes stationnaires réfléchies et générées par le dispositif de réglage de distribution de champ électromagnétique (5) peuvent être déplacées. Il en résulte qu'un chauffage irrégulier peut être réduit.
PCT/JP2016/004790 2015-11-10 2016-11-02 Dispositif de chauffage à microondes WO2017081855A1 (fr)

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Application Number Priority Date Filing Date Title
JP2017549981A JP6874687B2 (ja) 2015-11-10 2016-11-02 マイクロ波加熱装置

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JP2015-220026 2015-11-10
JP2015220026 2015-11-10

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WO2017081855A1 true WO2017081855A1 (fr) 2017-05-18

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018235161A1 (fr) * 2017-06-20 2018-12-27 三菱電機株式会社 Dispositif de chauffage par micro-ondes
WO2019009174A1 (fr) * 2017-07-04 2019-01-10 パナソニック株式会社 Dispositif de traitement à micro-ondes
WO2020054608A1 (fr) * 2018-09-10 2020-03-19 パナソニック株式会社 Appareil de traitement par micro-ondes
WO2023193693A1 (fr) * 2022-04-07 2023-10-12 湖南大学 Procédé d'amélioration de l'uniformité de champs électromagnétiques à l'intérieur d'une cavité résonante à micro-ondes statique

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013038715A1 (fr) * 2011-09-16 2013-03-21 パナソニック株式会社 Dispositif de traitement par micro-ondes
WO2015133081A1 (fr) * 2014-03-03 2015-09-11 パナソニック株式会社 Appareil de réglage de distribution de champ électromagnétique, son procédé de commande, et appareil de chauffage à micro-ondes

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010073382A (ja) * 2008-09-17 2010-04-02 Panasonic Corp マイクロ波処理装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013038715A1 (fr) * 2011-09-16 2013-03-21 パナソニック株式会社 Dispositif de traitement par micro-ondes
WO2015133081A1 (fr) * 2014-03-03 2015-09-11 パナソニック株式会社 Appareil de réglage de distribution de champ électromagnétique, son procédé de commande, et appareil de chauffage à micro-ondes

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018235161A1 (fr) * 2017-06-20 2018-12-27 三菱電機株式会社 Dispositif de chauffage par micro-ondes
US11558936B2 (en) 2017-07-04 2023-01-17 Panasonic Holdings Corporation Microwave processing device
WO2019009174A1 (fr) * 2017-07-04 2019-01-10 パナソニック株式会社 Dispositif de traitement à micro-ondes
CN110892789A (zh) * 2017-07-04 2020-03-17 松下电器产业株式会社 微波处理装置
JP7230802B2 (ja) 2017-07-04 2023-03-01 パナソニックホールディングス株式会社 マイクロ波処理装置
JPWO2019009174A1 (ja) * 2017-07-04 2020-05-21 パナソニック株式会社 マイクロ波処理装置
WO2020054608A1 (fr) * 2018-09-10 2020-03-19 パナソニック株式会社 Appareil de traitement par micro-ondes
EP3852496A4 (fr) * 2018-09-10 2021-12-01 Panasonic Corporation Appareil de traitement par micro-ondes
CN111183708B (zh) * 2018-09-10 2022-06-14 松下电器产业株式会社 微波处理装置
JPWO2020054608A1 (ja) * 2018-09-10 2021-08-30 パナソニック株式会社 マイクロ波処理装置
CN111183708A (zh) * 2018-09-10 2020-05-19 松下电器产业株式会社 微波处理装置
JP7380221B2 (ja) 2018-09-10 2023-11-15 パナソニックホールディングス株式会社 マイクロ波処理装置
WO2023193693A1 (fr) * 2022-04-07 2023-10-12 湖南大学 Procédé d'amélioration de l'uniformité de champs électromagnétiques à l'intérieur d'une cavité résonante à micro-ondes statique

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JPWO2017081855A1 (ja) 2018-08-30

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