EP2645001B1 - Microwave heating device - Google Patents

Microwave heating device Download PDF

Info

Publication number
EP2645001B1
EP2645001B1 EP11843277.2A EP11843277A EP2645001B1 EP 2645001 B1 EP2645001 B1 EP 2645001B1 EP 11843277 A EP11843277 A EP 11843277A EP 2645001 B1 EP2645001 B1 EP 2645001B1
Authority
EP
European Patent Office
Prior art keywords
gridiron
heating chamber
outer frame
heating
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.)
Not-in-force
Application number
EP11843277.2A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2645001A1 (en
EP2645001A4 (en
Inventor
Masaki Shibuya
Hiroshi Kawai
Ryuta Kondo
Makoto Nishimura
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 Corp
Original Assignee
Panasonic Corp
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 Panasonic Corp filed Critical Panasonic Corp
Publication of EP2645001A1 publication Critical patent/EP2645001A1/en
Publication of EP2645001A4 publication Critical patent/EP2645001A4/en
Application granted granted Critical
Publication of EP2645001B1 publication Critical patent/EP2645001B1/en
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
    • H05B6/6408—Supports or covers specially adapted for use in microwave heating apparatus
    • 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
    • F24C15/00—Details
    • F24C15/16—Shelves, racks or trays inside ovens; Supports therefor

Definitions

  • the microwave heating device can provide a heating apparatus with higher efficiency which can suppress abnormal heat generation from the grid member and the like which are placed within the heating chamber, thereby inducing less energy losses.
  • the bridge members are provided at positions spaced apart from an inner wall of the heating chamber, by a length equal to or more than 3/8 the wavelength of the standing wave.
  • the bridge members are formed from rod-shaped members having an annular shape.
  • the bridge members have no end portion, which prevents abnormal heat generation from the gridiron.
  • the microwave heating device forms a heating apparatus with higher efficiency which induces less energy losses.
  • the bridge members are placed such that arc portions of the bridge members are protruded to an outside of the outer frame.
  • the bridge members are structured such that their arc portions are protruded, and end portions of the bridge members are not protruded, which prevents abnormal heat generation from the gridiron. This can provide a microwave heating device with higher efficiency which induces less energy losses.
  • the outer frame is provided with a protruding portion, such that the gridiron comes in point-to-point contact with a rear-surface wall of the heating chamber.
  • the gridiron and the rear-surface wall of the heating chamber are made to come in line-to-line contact with each other over their contact surfaces, it is significantly hard to fabricate both the contact surfaces such that they are parallel with each other and, also, are straight. Thus, a small gap may be induced therebetween, and electric fields may be concentrated at these gaps.
  • the structure according to the first embodiment has been described with respect to an example where the cover 16 is formed from a mica, which is a low loss dielectric material, it can be similarly formed from ceramics or glasses.
  • the wavelength of standing waves SW is changed depending on the shape of the internal space within the heating chamber 1.
  • the wavelength of standing waves SW in the leftward and rightward direction in the heating chamber 1 is about 14 cm. Accordingly, 3/8 the wavelength ⁇ of standing waves is about 5.3 cm, 1/4 ⁇ is about 3.5 cm, and 1/8 ⁇ is about 1.8 cm.
  • the term "the wavelength ⁇ of a standing wave” refers to the periodic length including two antinodes and two nodes, and the periodic length including a single antinode and a single node corresponds to 1 / 2 the wavelength.
  • the microwave heating device according to the present invention can suppress abnormal heat generation from the grid member and the like which are placed within the heating chamber. This can provide a heating apparatus with higher efficiency which induces less energy losses.
  • the bridge members 200A to 200D are placed such that their longitudinal directions are coincident with the forward and rearward direction of the heating chamber 1, the bridge members 200A to 200D can be also placed such that their longitudinal directions are coincident with any directions, such as the leftward and rightward direction of the heating chamber 1, oblique directions of the heating chamber 1, and the like, which can also offer the same effects.
  • the gridiron 4 is provided with the hemispherical portions 23, so that the hemispherical portions 23 in the gridiron 4 come in contact with the lower rails 12 at two positions in each single side and, thus, come in point-to-point contact therewith at four positions, in total, in the left and right sides. Therefore, the outer frame 21 in the gridiron 4 is placed in such a way as to interpose a larger gap between it and the rails 12, over its portions other than the portions which come in point-to-point contact with the rails 12. Accordingly, in the structure according to the second embodiment, there is a larger gap between the gridiron 4 and the rails 12 over their entirety, which prevents concentrations of electric fields between the gridiron 4 and the rails 12, thereby realizing higher efficiency.
  • the structure according to the second embodiment has been described with respect to an example where the gridiron 4 is provided with the hemispherical portions 23 at two positions in each single side and, therefore, at four positions in the left and right sides.
  • the present invention is not limited to this structure. It is possible to support the gridiron 4 at least at three positions, and it is also possible to increase the number of the hemispherical portions 23 for improving the balance of the gridiron 4 when objects 5 to be heated are placed thereon, which can also offer the same effects.
  • the intervals between the rod-shaped members in the bridge members 20 in the gridiron 4E are set to have lengths equal to or more than about 1/4 the wavelength ⁇ of standing waves. Further, in the structure according to the third embodiment, the number of the rod-shaped members in the gridiron 4 is properly changed, according to the size of the heating chamber 1, and the object to be heated, which is placed thereon.
  • the gap L is set to be about 5 mm, but it can be at least 3 mm or more, which can prevent concentrations of electric fields.
  • the structure according to the third embodiment has been described with respect to an example where the gridiron 4 is provided with the U-shaped protruding portions 21 at two positions, it is also possible to increase the number of the protruding portions 21C, in order to prevent the gridiron 4 from being deformed when being strongly pressed against the rear-surface wall 1C.
  • the protruding portions 21C can have any shapes which can alleviate concentrations of electric fields and, thus, can be formed to have semicircular shapes, triangular shapes and the like, as well as U shapes, which can also offer the same effects.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electric Ovens (AREA)
EP11843277.2A 2010-11-25 2011-11-18 Microwave heating device Not-in-force EP2645001B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2010261961 2010-11-25
JP2010264550 2010-11-29
JP2011052660 2011-03-10
PCT/JP2011/006434 WO2012070211A1 (ja) 2010-11-25 2011-11-18 マイクロ波加熱装置

Publications (3)

Publication Number Publication Date
EP2645001A1 EP2645001A1 (en) 2013-10-02
EP2645001A4 EP2645001A4 (en) 2014-05-07
EP2645001B1 true EP2645001B1 (en) 2015-06-10

Family

ID=46145582

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11843277.2A Not-in-force EP2645001B1 (en) 2010-11-25 2011-11-18 Microwave heating device

Country Status (3)

Country Link
EP (1) EP2645001B1 (ja)
JP (1) JP5874040B2 (ja)
WO (1) WO2012070211A1 (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113260105A (zh) * 2021-05-27 2021-08-13 广东美的厨房电器制造有限公司 烹饪器具的微波发生系统和烹饪器具

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3798404A (en) * 1972-12-21 1974-03-19 Gen Electric Electronic oven with mode exciter
JPS5559209A (en) 1978-10-26 1980-05-02 Tokyo Shibaura Electric Co Automatic snow melting system
DE3040113A1 (de) * 1980-10-24 1982-05-27 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Kombinierter herd fuer mikrowellen- und konventionellen wiederstands-heizbetrieb
JP2951001B2 (ja) * 1990-12-07 1999-09-20 三洋電機株式会社 マイクロ波加熱装置
JPH09145064A (ja) 1995-11-21 1997-06-06 Toshiba Corp オーブン機能付き電子レンジ
JP3063643B2 (ja) * 1996-10-09 2000-07-12 松下電器産業株式会社 加熱装置
JP2004360986A (ja) * 2003-06-04 2004-12-24 Matsushita Electric Ind Co Ltd ヒータ付き高周波加熱調理器

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113260105A (zh) * 2021-05-27 2021-08-13 广东美的厨房电器制造有限公司 烹饪器具的微波发生系统和烹饪器具

Also Published As

Publication number Publication date
JPWO2012070211A1 (ja) 2014-05-19
WO2012070211A1 (ja) 2012-05-31
EP2645001A1 (en) 2013-10-02
JP5874040B2 (ja) 2016-03-01
EP2645001A4 (en) 2014-05-07

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