EP3503682B1 - High-frequency heating device - Google Patents

High-frequency heating device Download PDF

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Publication number
EP3503682B1
EP3503682B1 EP17843289.4A EP17843289A EP3503682B1 EP 3503682 B1 EP3503682 B1 EP 3503682B1 EP 17843289 A EP17843289 A EP 17843289A EP 3503682 B1 EP3503682 B1 EP 3503682B1
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EP
European Patent Office
Prior art keywords
microwaves
surface wave
generation unit
frequency
heating device
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.)
Active
Application number
EP17843289.4A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3503682A4 (en
EP3503682A1 (en
Inventor
Toshiyuki Okajima
Yoshiharu Oomori
Koji Yoshino
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.)
Panasonic Intellectual Property Management Co Ltd
Original Assignee
Panasonic Intellectual Property Management Co Ltd
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Publication of EP3503682A1 publication Critical patent/EP3503682A1/en
Publication of EP3503682A4 publication Critical patent/EP3503682A4/en
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Publication of EP3503682B1 publication Critical patent/EP3503682B1/en
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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C7/00—Stoves or ranges heated by electric energy
    • F24C7/02—Stoves or ranges heated by electric energy using microwaves
    • 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 disclosure relates to a high-frequency heating device such as a microwave oven.
  • Patent Literature 1 discloses a high-frequency heating device which thaws a frozen sushi placed in a surface wave transmission line by directly supplying microwaves to the surface wave transmission line.
  • JP H06 338387 relates to a high-frequency heating device that uses a surface wave heating system, an adjusting means and a detecting means to improve the heating efficiency.
  • An objective of the present disclosure is to provide a high-frequency heating device which contributes to achieving the aforementioned goal.
  • a high-frequency heating device includes a first generation unit, a surface wave exciter, and a first connecting unit.
  • the first generation unit generates microwaves.
  • the surface wave exciter includes a plurality of metal plates periodically arranged at a predetermined interval in a propagation direction of the microwaves and heats a heating subject by propagating the microwaves in a surface wave mode.
  • the first connecting unit is provided in a middle portion of the surface wave exciter in the propagation direction of the microwaves generated by the first generation unit so that the microwaves are supplied to the surface wave exciter through the first connecting unit.
  • the present invention is defined by the subject-matter of the independent claims.
  • the dependent claims are directed to embodiments of advantage.
  • a heating subject can be evenly heated.
  • a high-frequency heating device includes a first generation unit, a surface wave exciter, and a first connecting unit.
  • the first generation unit generates microwaves.
  • the surface wave exciter includes a plurality of metal plates periodically arranged at a predetermined interval in a propagation direction of the microwaves and heats a heating subject by propagating the microwaves in a surface wave mode.
  • the first connecting unit is disposed in a middle portion of the surface wave exciter in the propagation direction of the microwaves generated by the first generation unit so that the microwaves are supplied to the surface wave exciter through the first connecting unit.
  • the high-frequency heating device includes a second connecting unit and a third connecting unit in addition to those in the first aspect.
  • the second connecting unit is disposed at one end portion of the surface wave exciter in the propagation direction of the microwaves.
  • the third connecting unit is disposed at the other end portion of the surface wave exciter in the propagation direction of the microwaves.
  • the high-frequency heating device further includes a divider in addition to those in the second aspect.
  • the divider distributes the microwaves generated by the first generation unit to the first connecting unit, the second connecting unit, and the third connecting unit.
  • the high-frequency heating device further includes a second generation unit and a third generation unit in addition to those in the second aspect.
  • the second generation unit generates microwaves having a frequency different from the frequency of the microwaves generated by the first generation unit and supplies the microwaves to the second connecting unit.
  • the third generation unit generates microwaves having a frequency different from the frequency of the microwaves generated by the first generation unit and supplies the microwaves to the third connecting unit.
  • the frequency of the microwaves generated by the second generation unit in the fourth aspect is different from the frequency of the microwaves generated by the third generation unit.
  • the high-frequency heating device further includes a second generation unit and a divider in addition to those in the second aspect.
  • the second generation unit generates microwaves having a frequency different from the frequency of the microwaves generated by the first generation unit.
  • the divider distributes the microwaves generated by the second generation unit to the second connecting unit and the third connecting unit.
  • the frequency of the microwaves generated by the second generation unit in the sixth aspect is different from the frequency of the microwaves generated by the first generation unit.
  • the high-frequency heating device according to the present disclosure is specifically a microwave oven.
  • the high-frequency heating device according to the present disclosure is not limited to this and includes a heating device which uses dielectric heating, a garbage disposer, a semiconductor manufacturing device, and the like.
  • FIG. 1 and FIG. 2 are a vertical cross-sectional view and a horizontal cross-sectional view, respectively, which schematically illustrate a configuration of high-frequency heating device 1a according to Embodiment 1 of the present disclosure.
  • high-frequency heating device 1a includes heating chamber 2, generation unit 8, surface wave exciter 9, connecting unit 12, and control unit 14.
  • Surface wave exciter 9 includes connecting unit 12 provided in a middle portion and surface wave exciter 9a and surface wave exciter 9b provided across connecting unit 12.
  • High-frequency heating device 1a is configured to heat heating subject 6 (heating subjects 6a and 6b in the present exemplary embodiment) placed on tray 4 using microwaves propagating on a surface of surface wave exciter 9 in the surface wave mode.
  • Generation unit 8 includes a magnetron and an inverter and is configured to generate microwaves under control of control unit 14.
  • Generation unit 8 may include, for example, a solid-state oscillator and a power amplifier instead of the magnetron and the inverter.
  • generation unit 8 corresponds to the first generation unit.
  • FIG. 2 schematically illustrates a situation in which microwaves in the surface wave mode propagate on surface wave exciter 9 and also schematically illustrates a placement position of heating subject 6 on tray 4 (not illustrated in FIG. 2 ).
  • Surface wave exciter 9 is provide below tray 4.
  • Surface wave exciter 9 heats heating subject 6 placed on tray 4 by propagating microwaves in the surface wave mode.
  • Surface wave exciter 9 is a stub-type surface wave exciter having a periodic structure.
  • Surface wave exciter 9 includes a plurality of metal plates 11 arranged on metal plate 13 at a predetermined interval.
  • the excitation frequency of surface wave exciter 9 depends on material, size, etc. In the case of the stub-type surface wave exciter, the excitation frequency can be set to a desired value by appropriately selecting the height, interval, etc., of metal plates 11. Generally, the excitation frequency of surface wave exciter 9 increases as the height of metal plates 11 is reduced and as the interval between metal plates 11 is reduced.
  • Metal plates 11 are arranged parallel to each other.
  • Surface wave exciters 9a and 9b propagate the surface waves in a direction perpendicular to metal plate 11, that is, in the alinement direction of metal plates 11.
  • Propagation direction D (the horizontal direction in the drawings) of the microwaves propagating on surface wave exciters 9a and 9b in the surface wave mode matches the alinement direction of metal plates 11.
  • a gap is provided between surface wave exciters 9a and 9b.
  • Connecting unit 12 for supplying the microwaves to surface wave exciters 9a and 9b is provided in this gap.
  • the gap between surface wave exciters 9a and 9b is located in the middle portion of surface wave exciter 9 in propagation direction D of the microwaves.
  • the middle portion in which connecting unit 12 is provided is located in the very center of surface wave exciter 9 in propagation direction D of the microwaves. However, it is sufficient that the middle portion be other than the end portions of entire surface wave exciter 9 in propagation direction D of the microwaves.
  • connecting unit 12 corresponds to the first connecting unit.
  • the microwaves are supplied to the right end of surface wave exciter 9a and the left end of surface wave exciter 9b through connecting unit 12.
  • FIG. 1 and FIG. 2 illustrate box-shaped connecting unit 12.
  • the shape of connecting unit 12 is arbitrary as long as connecting unit 12 can supply the microwaves to surface wave exciter 9.
  • FIG. 3 schematically illustrates a situation in which microwaves in the surface wave mode propagate on surface wave exciter 9 and also schematically illustrates a placement position of heating subject 6 on tray 4 (not illustrated in FIG. 3 ) in the horizontal cross-sectional view illustrated in FIG. 2 .
  • the microwaves generated by generation unit 8 are supplied to surface wave exciters 9a and 9b through connecting unit 12.
  • Surface wave exciter 9a propagates surface waves S1 in a direction away from surface wave exciter 9b (propagation direction D1).
  • Surface wave exciter 9b propagates surface waves S2 in a direction away from surface wave exciter 9a (propagation direction D2).
  • propagation directions D1 and D2 are opposite to each other.
  • Heating subject 6a placed proximate to surface wave exciter 9a is heated with surface waves S1 propagating on surface wave exciter 9a.
  • Heating subject 6b placed proximate to surface wave exciter 9b is heated with surface waves S2 propagating on surface wave exciter 9b.
  • the intensity of surface waves S1 and S2 is reduced, for example, when surface waves S1 and S2 are partially absorbed by heating subject 6 or are distanced from connecting unit 12.
  • surface waves S1 and surface waves S2 basically have substantially the same level of intensity distribution and heat heating subjects 6a and 6b to the same extent.
  • a conventional high-frequency heating device is configured to supply microwaves only from an end portion of a surface wave exciter in a propagation direction of the microwaves.
  • the intensity of the microwaves is exponentially reduced and variations in heating increase.
  • This phenomenon is notable when a large heating subject is heated and when two or more heating subjects are heated at the same time, as illustrated in FIG. 1 and FIG. 2 .
  • connecting unit 12 is provided in the middle portion of surface wave exciter 9 in propagation direction D of the microwaves.
  • surface wave exciter 9 When supplied with the microwaves through connecting unit 12, surface wave exciter 9 generates surface waves S1 which propagate from the middle portion to one end portion and surface waves S2 which propagate from the middle portion to the other end portion.
  • heating subjects 6a and 6b can be more evenly heated with surface waves S1 and S2 than when the microwaves are supplied only from one end portion of surface wave exciter 9.
  • FIG. 4 is a horizontal cross-sectional view schematically illustrating a configuration of high-frequency heating device 1b.
  • FIG. 4 schematically illustrates a situation in which microwaves in the surface wave mode propagate on surface wave exciter 9 and also schematically illustrates a placement position of heating subject 6 on tray 4 (not illustrated in FIG. 4 ).
  • high-frequency heating device 1b further includes connecting units 22 and 24 and divider 26 in addition to the elements according to Embodiment 1.
  • Connecting units 22 and 24 are provided at both ends of surface wave exciter 9 in propagation direction D of the microwaves generated by generation unit 8 so that the microwaves are supplied to surface wave exciter 9.
  • connecting units 22 and 24 correspond to the second connecting unit and the third connecting unit, respectively.
  • connecting unit 22 is provided at an end portion of surface wave exciter 9a opposite surface wave exciter 9b so that the microwaves are supplied to surface wave exciter 9a.
  • Connecting unit 24 is provided at an end portion of surface wave exciter 9b opposite surface wave exciter 9a so that the microwaves are supplied to surface wave exciter 9b.
  • the microwaves supplied through connecting unit 22 result in surface waves S3 which propagate on surface wave exciter 9a from the left end of surface wave exciter 9a toward connecting unit 12 in propagation direction D2.
  • the microwaves supplied through connecting unit 24 result in surface waves S4 which propagate on surface wave exciter 9b from the right end of surface wave exciter 9b toward connecting unit 12 in propagation direction D1.
  • Divider 26 distributes the microwaves generated by generation unit 8. As illustrated in FIG. 4 , divider 26 distributes and supplies the microwaves to connecting units 12, 22, and 24. Specifically, microwaves having the same frequency are supplied to connecting units 12, 22, and 24. Specific examples of divider 26 include a Wilkinson power divider, a hybrid coupler, and a resistance divider.
  • heating subject 6a is heated with surface waves S1 and S3, and heating subject 6b is heated with surface waves S2 and S4.
  • heating subjects 6a and 6b are more evenly heated than in Embodiment 1.
  • the microwaves generated by generation unit 8 are supplied to surface wave exciter 9 through connecting units 12, 22, and 24.
  • the configuration can be simpler and the manufacturing cost can be less than when a dedicated generation unit is provided for one connecting unit.
  • FIG. 5 is a horizontal cross-sectional view schematically illustrating a configuration of high-frequency heating device 1c.
  • FIG. 5 schematically illustrates a situation in which microwaves in the surface wave mode propagate on surface wave exciter 9 and also schematically illustrates a placement position of heating subject 6 on tray 4 (not illustrated in FIG. 5 ).
  • high-frequency heating device 1c further includes generation unit 32 and generation unit 34.
  • High-frequency heating device 1c includes, instead of control unit 14, control unit 36 configured to control generation units 8, 32, and 34.
  • High-frequency heating device 1c does not include divider 26, but includes connecting units 22 and 24 connected to generation unit 32 and generation unit 34, respectively.
  • generation units 32 and 34 correspond to the second generation unit and the third generation unit, respectively.
  • heating subjects 6a and 6b are heated with not only surface waves S1 and S2 originating from the microwaves supplied through connecting unit 12, but also surface waves S3 and S4 originating from the microwaves supplied through connecting units 22 and 24.
  • generation units 8, 32, and 34 are connected to connecting units 12, 22, and 24, respectively. Therefore, microwaves generated by generation units 8, 32, and 34 and having frequencies different from each other can be supplied to connecting units 12, 22, and 24.
  • Surface waves S3 can have a frequency different from those of surface waves S1 and S2
  • surface waves S4 can have a frequency different from those of surface waves S1 and S2.
  • FIG. 6 is a horizontal cross-sectional view schematically illustrating a configuration of high-frequency heating device 1d.
  • FIG. 6 schematically illustrates a situation in which microwaves in the surface wave mode propagate on surface wave exciter 9 and also schematically illustrates a placement position of heating subject 6 on tray 4 (not illustrated in FIG. 6 ).
  • high-frequency heating device 1d includes generation unit 42 instead of generation units 32 and 34.
  • High-frequency heating device 1d includes, instead of control unit 36, control unit 46 configured to control generation units 8 and 42.
  • High-frequency heating device 1d includes divider 44 configured to distribute and supply the microwaves generated by generation unit 42 to connecting units 22 and 24.
  • generation unit 42 corresponds to the second generation unit.
  • heating subjects 6a and 6b are heated with not only surface waves S1 and S2 originating from the microwaves supplied through connecting unit 12, but also surface waves S3 and S4 originating from the microwaves supplied through connecting units 22 and 24.
  • generation unit 8 is connected to connecting unit 12, and generation unit 42 is connected to connecting units 22 and 24 via divider 44. Therefore, microwaves generated by generation units 8 and 42 and having frequencies different from each other can be supplied to connecting units 12 and connecting units 22, and 24.
  • Surface waves S3 and S4 can have frequencies different from those of surface waves S1 and S2.
  • generation unit 8 is provided corresponding to connecting unit 12
  • generation unit 42 is provided corresponding to connecting units 22 and 24.
  • the configuration can be simpler and the manufacturing cost can be less than when a dedicated generation unit is provided for one connecting unit.
  • Embodiments 1 to 4 have been described above, the present disclosure is not limited to these exemplary embodiments.
  • connecting unit 12 is provided in the middle portion of surface wave exciter 9 in propagation direction D of the microwaves.
  • two or more connecting units may be provided in the middle portion of surface wave exciter 9.
  • surface wave exciter 9 includes connecting unit 12 provided in the gap of the middle portion.
  • connecting unit 12 is provided in the middle portion of the surface wave exciter, surface wave exciter 9 does not necessarily need to have a gap in the middle portion.
  • connecting units 22 and 24 are provided at the both ends of surface wave exciter 9.
  • one connecting unit may be provided at only one end portion of surface wave exciter 9.
  • generation units 8, 32, and 34 generate microwaves having frequencies different from each other. However, there may be cases where these microwaves have the same frequency.
  • the present disclosure is applicable to a microwave oven, a dehydrator, a heating device for pottery, a garbage disposer, a semiconductor manufacturing device, and the like.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Constitution Of High-Frequency Heating (AREA)
EP17843289.4A 2016-08-22 2017-07-24 High-frequency heating device Active EP3503682B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2016162144 2016-08-22
PCT/JP2017/026621 WO2018037803A1 (ja) 2016-08-22 2017-07-24 高周波加熱装置

Publications (3)

Publication Number Publication Date
EP3503682A1 EP3503682A1 (en) 2019-06-26
EP3503682A4 EP3503682A4 (en) 2019-08-14
EP3503682B1 true EP3503682B1 (en) 2020-04-01

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EP17843289.4A Active EP3503682B1 (en) 2016-08-22 2017-07-24 High-frequency heating device

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EP (1) EP3503682B1 (zh)
JP (1) JP6967708B2 (zh)
CN (1) CN109156054B (zh)
WO (1) WO2018037803A1 (zh)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3772233A4 (en) * 2018-03-26 2021-05-05 Panasonic Intellectual Property Management Co., Ltd. MICROWAVE HEATER
JP2023148648A (ja) * 2022-03-30 2023-10-13 パナソニックＩｐマネジメント株式会社 高周波加熱装置

Family Cites Families (8)

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Publication number Priority date Publication date Assignee Title
JPS52155447A (en) * 1976-06-18 1977-12-23 Matsushita Electric Ind Co Ltd High frequency heating equipment
JPH06260275A (ja) * 1993-03-03 1994-09-16 Matsushita Electric Ind Co Ltd 高周波加熱装置
JPH06338387A (ja) * 1993-05-28 1994-12-06 Matsushita Electric Ind Co Ltd 高周波加熱装置
JPH07161471A (ja) * 1993-12-07 1995-06-23 Matsushita Electric Ind Co Ltd 高周波加熱装置
WO2004098241A1 (ja) * 2003-04-25 2004-11-11 Matsushita Electric Industrial Co., Ltd. 高周波加熱装置及びその制御方法
EP2906021B1 (en) * 2012-10-03 2023-08-30 Mitsubishi Electric Corporation Electromagnetic transmission device and electromagnetic transmission system
JP6288461B2 (ja) * 2012-12-07 2018-03-07 パナソニックＩｐマネジメント株式会社 マイクロ波処理装置
CN104676670A (zh) * 2014-05-28 2015-06-03 广东美的厨房电器制造有限公司 半导体微波炉及其半导体微波源

Non-Patent Citations (1)

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Title
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Publication number Publication date
CN109156054A (zh) 2019-01-04
EP3503682A4 (en) 2019-08-14
JP6967708B2 (ja) 2021-11-17
JPWO2018037803A1 (ja) 2019-06-20
EP3503682A1 (en) 2019-06-26
WO2018037803A1 (ja) 2018-03-01
CN109156054B (zh) 2020-12-08

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