EP3780909A1 - Hochfrequenzerwärmungsvorrichtung - Google Patents

Hochfrequenzerwärmungsvorrichtung Download PDF

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Publication number
EP3780909A1
EP3780909A1 EP19781210.0A EP19781210A EP3780909A1 EP 3780909 A1 EP3780909 A1 EP 3780909A1 EP 19781210 A EP19781210 A EP 19781210A EP 3780909 A1 EP3780909 A1 EP 3780909A1
Authority
EP
European Patent Office
Prior art keywords
surface wave
wave line
loop antenna
heating device
frequency heating
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
EP19781210.0A
Other languages
English (en)
French (fr)
Other versions
EP3780909A4 (de
EP3780909B1 (de
Inventor
Kazuki Maeda
Yoshiharu Oomori
Toshiyuki Okajima
Koji Yoshino
Masayuki Kubo
Hiroyuki Uejima
Takanori Hirobe
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
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
Priority claimed from JP2018073616A external-priority patent/JP7113209B2/ja
Priority claimed from JP2018073617A external-priority patent/JP2019185965A/ja
Application filed by Panasonic Intellectual Property Management Co Ltd filed Critical Panasonic Intellectual Property Management Co Ltd
Publication of EP3780909A1 publication Critical patent/EP3780909A1/de
Publication of EP3780909A4 publication Critical patent/EP3780909A4/de
Application granted granted Critical
Publication of EP3780909B1 publication Critical patent/EP3780909B1/de
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Anticipated expiration legal-status Critical

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    • 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

Definitions

  • the present disclosure relates to a high-frequency heating device including a surface wave transmission line of a periodic structure.
  • a high-frequency heating device of this type supplies high-frequency power to a surface wave line through a waveguide to heat a heating target by using surface waves excited on the surface wave line (see, for example, Patent Literature 1). Heating with surface waves will be hereinafter referred to as surface wave heating.
  • Patent Literature 2 discloses a method using a monopole antenna disposed at the front end of a power feeder.
  • the power supply system including a waveguide In the power supply system including a waveguide, device size increases. In the power supply system including a monopole antenna, device size can be reduced as compared with the power supply system including a waveguide. However, radiation efficiency of the antenna decreases due to the influence of a peripheral object, and it is, therefore, difficult to perform impedance matching with the surface wave line. Consequently, high-frequency power cannot be efficiently supplied, and surface wave heating becomes insufficient.
  • the present disclosure has been made in order to solve the problems to date, and has an object of providing a small-size high-frequency heating device with high efficiency.
  • a high-frequency heating device includes: a high-frequency power generator configured to generate microwaves; a surface wave line containing a conductive material; a power feeder connected to the high-frequency power generator; and a loop antenna disposed at a front end of the power feeder and facing an end of the surface wave line.
  • the size of the power feeder can be reduced, and surface wave heating can be performed efficiently.
  • a high-frequency heating device includes: a high-frequency power generator configured to generate microwaves; a surface wave line containing a conductive material; a power feeder connected to the high-frequency power generator; and a loop antenna disposed at a front end of the power feeder and facing an end of the surface wave line.
  • the loop antenna has a surface that is parallel to the end of the surface wave line and faces the end of the surface wave line.
  • the surface wave line is a periodic structure in which members having a plate or rod shape are periodically arranged on a flat plate and are oriented perpendicularly to the flat plate.
  • the loop antenna has a height smaller than a height of the members constituting the surface wave line.
  • the power feeder is disposed near a bottom surface of the surface wave line.
  • the loop antenna extends in parallel with the members constituting the surface wave line and is grounded on a surface on which the power feeder is grounded.
  • the high-frequency heating device in addition to the configuration of the first aspect, further includes a metal plate disposed at a side of the loop antenna opposite to the surface wave line.
  • a position of each of the power feeder and the metal plate is changeable.
  • the high-frequency heating device in addition to the configuration of the first aspect, further includes an antenna cover disposed above the loop antenna and the antenna cover is configured to turn electric power radiated from the loop antenna toward the surface wave line.
  • the antenna covers the loop antenna and a part of the surface wave line.
  • a gap with a predetermined distance is provided between the antenna cover and the surface wave line.
  • FIG. 1 is a schematic view illustrating a configuration of a high-frequency heating device according to a first embodiment of the present disclosure.
  • FIG. 2 is a perspective view illustrating a configuration near loop antenna 3 according to this embodiment.
  • high-frequency power generator 1 generates high-frequency power such as microwaves and supplies high-frequency power to power feeder 2 through a coaxial line.
  • Power feeder 2 includes loop antenna 3 at the front end thereof. Loop antenna 3 emits high-frequency power toward surface wave line 4.
  • High-frequency power is concentrated in space near surface wave line 4.
  • Heating target 5 is placed on placing table 6 near surface wave line 4, and heated by high-frequency power concentrated near surface wave line 4.
  • heating chamber 7 accommodates surface wave line 4 and placing table 6. These components, however, do not need to be disposed in heating chamber 7.
  • Loop antenna 3 faces an end of surface wave line 4. High-frequency current flows in loop antenna 3 to thereby generate a ring-shaped magnetic field, and an induced current is caused to flow in conductive surface wave line 4 by electromagnetic induction. Accordingly, surface waves are generated and heat heating target 5.
  • the loop-shaped antenna is used so that the height of the antenna can be reduced, and the length of the antenna can be increased. Accordingly, a packaging volume of the antenna increases so that a high input impedance can be maintained and a decrease in radiation resistor can be prevented or reduced. As a result, the size of the power feeder can be reduced, and surface wave heating can be efficiently performed.
  • FIG. 3 is a perspective view illustrating an example of surface wave line 4.
  • surface wave line 4 is a periodic structure in which plate-shaped stubs 9 are periodically arranged at predetermined intervals on a flat plate and are oriented perpendicularly to the flat plate.
  • Stubs 9 are made of a conductive material such as aluminium or copper. This configuration allows surface waves to be transmitted uniformly on surface wave line 4. As a result, heating target 5 can be uniformly heated.
  • FIG. 4 is a perspective view illustrating another example of surface wave line 4.
  • surface wave line 4 may be a periodic structure in which rod-shaped stubs 10 are periodically arranged on a flat plate and are oriented perpendicularly to the flat plate. This configuration can ease matching of surface waves radiated from flat loop antenna 8 (see FIGS. 5 and 6 ) with surface wave line 4. Consequently, surface waves are uniformly transmitted on surface wave line 4 so that heating efficiency thereby increases.
  • FIG. 5 is a schematic view illustrating a configuration near loop antenna 3 according to a second embodiment of the present disclosure.
  • FIG. 6 is a perspective view illustrating a configuration near loop antenna 3.
  • loop antenna 3 is flat loop antenna 8.
  • Flat loop antenna 8 has a surface that is parallel to an end of surface wave line 4 and faces the end of surface wave line 4.
  • Power feeder 2 is connected to high-frequency power generator 1. Power feeder 2 is disposed on a surface on which the bottom surface of surface wave line 4 is placed. An end of flat loop antenna 8 is connected to power feeder 2. The other end of flat loop antenna 8 is grounded on the surface on which the bottom surface of surface wave line 4 is placed.
  • flat loop antenna 8 has a rectangular shape, and has a surface that is parallel to the end of surface wave line 4 and faces the end of surface wave line 4.
  • the area of a magnetic field generated by a flow of a high-frequency current in flat loop antenna 8 can be made large relative to surface wave line 4.
  • electromagnetic waves radiated from flat loop antenna 8 can easily match with surface wave line 4.
  • efficiency in conversion to surface waves increases, and thus, heating efficiency is enhanced.
  • FIG. 7 is a schematic view illustrating an example of a high-frequency heating device according to a third embodiment of the present disclosure. As illustrated in FIG. 7 , a height of flat loop antenna 8 according to this embodiment is lower than a height of stubs 9 constituting surface wave line 4.
  • This configuration allows placing table 6 to be disposed closer to surface wave line 4.
  • heating target 5 can be placed closer to surface wave line 4.
  • heating efficiency increases.
  • FIG. 8 is a schematic view illustrating another example of the high-frequency heating device of this embodiment. As illustrated in FIG. 8 , in a case where placing table 6 is large, power feeder 2 and flat loop antenna 8 may be disposed at both ends of surface wave line 4.
  • FIG. 9 is a schematic view illustrating a configuration near flat loop antenna 8 according to a fourth embodiment of the present disclosure.
  • supposing a height of stubs 9 constituting a periodic structure of surface wave line 4 is La, and a distance between two adjacent stubs 9 is Lb, if a distance from the upper surface of one stub 9 to the upper surface of its adjacent stub 9 by way of the surfaces of stubs 9 (i.e., 2La + Lb) is 1/2 of the wavelength of radiant power, a surface concentration degree of resultant surface waves increases so that heating efficiency thereby increases.
  • the wavelength of radiant power is varied such that the length corresponding to 1/2 of the wavelength of radiant power is equal to the distance from the upper surface of one stub 9 to its adjacent stub 9 by way of the surfaces of stubs 9 (i.e., 2La + Lb). Accordingly, the surface concentration degree of surface waves is increased so that heating efficiency can be thereby increased.
  • each stub 9 Supposing the thickness of each stub 9 is Lc, a distance between upper surfaces of two stubs 9 sandwiching one stub 9 is 2La + 2Lb + Lc.
  • Application of electric power of a wavelength corresponding to 2La + 2Lb + Lc can vary the surface concentration degree of surface waves.
  • the surface concentration degree of surface waves can be controlled. Accordingly, optimum and efficient heating can be performed in accordance with the thickness and width of an object to be cooked.
  • FIG. 10 is a schematic view illustrating a configuration near flat loop antenna 8 according to a fifth embodiment of the present disclosure.
  • metal plate 11 is disposed at a side of flat loop antenna 8 opposite to surface wave line 4. With this configuration, metal plate 11 reflects high-frequency power radiated from flat loop antenna 8 to a direction opposite to surface wave line 4 and turns the direction of the high-frequency power toward surface wave line 4.
  • FIG. 11 is a schematic view illustrating a configuration near flat loop antenna 8 according to a sixth embodiment of the present disclosure. As illustrated in FIG. 11 , a high-frequency heating device according to this embodiment includes antenna base 8a.
  • Antenna base 8a is used for fixing power feeder 2 and grounding flat loop antenna 8.
  • Antenna base 8a is electrically connected to surface wave line 4 and metal plate 11 through position adjuster 13 such as a cable. The position of antenna base 8a can be changed freely.
  • Coaxial line 12 connects high-frequency power generator 1 to power feeder 2.
  • a relative position of surface wave line 4 and flat loop antenna 8 and a relative position of metal plate 11 and flat loop antenna 8 are variable. Accordingly, it is possible to cope with the magnitude of the magnetic field in accordance with the frequency of radiant power so that impedance matching can be easily performed. As a result, efficiency in converting to surface waves is enhanced, and heating efficiency increases.
  • FIG. 12 is a schematic view illustrating a configuration of a high-frequency heating device according to a seventh embodiment of the present disclosure.
  • FIG. 13 is a perspective view illustrating a configuration near flat loop antenna 8 according to this embodiment.
  • the high-frequency heating device includes antenna cover 14 disposed at a predetermined distance from flat loop antenna 8 ahead of and above flat loop antenna 8 in FIG. 13 .
  • Antenna cover 14 is made of a metal member.
  • Flat loop antenna 8 radiates electric power mainly forward, rearward, and upward in FIG. 13 .
  • Antenna cover 14 reflects electric power radiated forward and upward from flat loop antenna 8 and turns the reflected electric power toward surface wave line 4. As a result, heating target 5 can be efficiently heated.
  • flat loop antenna 8 has a rectangular shape.
  • the present disclosure is not limited to this example.
  • Flat loop antenna 8 may have a circular shape or a square shape, for example.
  • FIG. 14 is a schematic view illustrating a configuration of a high-frequency heating device according to an eighth embodiment of the present disclosure.
  • antenna cover 14 is disposed to cover not only flat loop antenna 8 but also at least some of stubs 9 included in surface wave line 4. That is, antenna cover 14 covers flat loop antenna 8 and a part of surface wave line 4.
  • dot-dash lines represent magnetic fields directly radiated from flat loop antenna 8.
  • Broken lines represent magnetic fields generated by reflection on antenna cover 14.
  • Dotted lines represent electric fields generated at this time.
  • An optimum length Ld of a portion of antenna cover 14 covering surface wave line 4 varies depending on the size of flat loop antenna 8 and the size of a periodic structure constituting surface wave line 4, and needs to be adjusted in accordance with electromagnetic field distribution.
  • a perpendicular distance between the upper surface of surface wave line 4 and antenna cover 14 is set at a predetermined distance (distance Le). That is, a gap with the predetermined distance is provided between antenna cover 14 and surface wave line 4.
  • FIG. 15 is a top view illustrating a configuration near flat loop antenna 8 according to the ninth embodiment.
  • Broken lines and dot-dash lines in FIG. 15 represent magnetic fields generated when high-frequency power generator 1 operates.
  • the dot-dash lines represent magnetic fields in the absence of antenna cover 14, and the broken lines represent magnetic fields in the presence of antenna cover 14.
  • the present disclosure is applicable to household or industrial high-frequency heating devices.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Constitution Of High-Frequency Heating (AREA)
EP19781210.0A 2018-04-06 2019-03-29 Hochfrequenzerwärmungsvorrichtung Active EP3780909B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2018073616A JP7113209B2 (ja) 2018-04-06 2018-04-06 高周波加熱装置
JP2018073617A JP2019185965A (ja) 2018-04-06 2018-04-06 高周波加熱装置
PCT/JP2019/014067 WO2019194098A1 (ja) 2018-04-06 2019-03-29 高周波加熱装置

Publications (3)

Publication Number Publication Date
EP3780909A1 true EP3780909A1 (de) 2021-02-17
EP3780909A4 EP3780909A4 (de) 2021-05-05
EP3780909B1 EP3780909B1 (de) 2022-05-04

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Application Number Title Priority Date Filing Date
EP19781210.0A Active EP3780909B1 (de) 2018-04-06 2019-03-29 Hochfrequenzerwärmungsvorrichtung

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EP (1) EP3780909B1 (de)
CN (1) CN111066375B (de)
WO (1) WO2019194098A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2022162186A (ja) * 2021-04-12 2022-10-24 パナソニックＩｐマネジメント株式会社 高周波加熱装置
CN113597038B (zh) * 2021-07-27 2022-07-19 北京航空航天大学 一种用于微波炉的微波表面波均匀加热装置
CN113766690B (zh) * 2021-08-05 2022-06-14 北京航空航天大学 一种波导喇叭激励金属褶皱表面波均匀加热装置

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5112130B2 (de) 1972-06-08 1976-04-16
JPS52155443A (en) * 1976-06-18 1977-12-23 Matsushita Electric Ind Co Ltd High frequency heating equipment
JPS5911289Y2 (ja) * 1979-01-29 1984-04-07 株式会社日立ホームテック 高周波加熱装置
JPS60262386A (ja) * 1984-06-07 1985-12-25 松下電器産業株式会社 高周波加熱装置
JPS6139480A (ja) * 1984-07-31 1986-02-25 松下電器産業株式会社 解凍装置
JPH06338387A (ja) 1993-05-28 1994-12-06 Matsushita Electric Ind Co Ltd 高周波加熱装置
JPH07220866A (ja) * 1994-01-31 1995-08-18 Toshiba Corp 電子レンジ
CN1258380A (zh) * 1998-03-16 2000-06-28 松下电器产业株式会社 无电极放电能量供给装置和无电极放电灯装置
KR100389000B1 (ko) * 2000-01-22 2003-06-25 삼성전자주식회사 전자렌지
JP2009277559A (ja) * 2008-05-16 2009-11-26 Hitachi Appliances Inc 加熱調理器
FR2994773B1 (fr) * 2012-08-22 2016-01-29 Onera (Off Nat Aerospatiale) Element de surface inductif
JP6089224B2 (ja) * 2012-10-30 2017-03-08 パナソニックＩｐマネジメント株式会社 高周波加熱調理装置
CN104604331B (zh) * 2012-12-07 2017-04-05 松下知识产权经营株式会社 微波处理装置
JP2015162272A (ja) * 2014-02-26 2015-09-07 パナソニック株式会社 マイクロ波処理装置
CN108781487B (zh) * 2016-03-23 2021-02-02 松下知识产权经营株式会社 微波处理装置
JP6956326B2 (ja) * 2016-06-30 2021-11-02 パナソニックＩｐマネジメント株式会社 高周波加熱装置
JP2018032471A (ja) * 2016-08-22 2018-03-01 パナソニックＩｐマネジメント株式会社 高周波加熱装置
WO2018037696A1 (ja) * 2016-08-22 2018-03-01 パナソニックＩｐマネジメント株式会社 高周波加熱装置
EP3503681B1 (de) * 2016-08-22 2020-05-13 Panasonic Intellectual Property Management Co., Ltd. Hochfrequenz-erwärmungsvorrichtung

Also Published As

Publication number Publication date
WO2019194098A1 (ja) 2019-10-10
CN111066375B (zh) 2022-03-04
EP3780909A4 (de) 2021-05-05
CN111066375A (zh) 2020-04-24
EP3780909B1 (de) 2022-05-04

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