JP3690094B2

JP3690094B2 - High frequency heating device

Info

Publication number: JP3690094B2
Application number: JP33263697A
Authority: JP
Inventors: 豊継松倉
Original assignee: Panasonic Corp; Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Corp; Panasonic Holdings Corp
Priority date: 1997-12-03
Filing date: 1997-12-03
Publication date: 2005-08-31
Anticipated expiration: 2017-12-03
Also published as: JPH11167986A

Description

【０００１】
【発明の属する技術分野】
本発明は、電子レンジなどの高周波加熱装置の加熱効率の改善に関するもので特に加熱室の幅寸法が奥行寸法に対して比率の大きい吊下げ式などの高周波加熱装置に関する。
【０００２】
【従来の技術】
従来のこの種の高周波加熱装置は特開平３−１５１９０号公報に記載されているようなものが一般的であった。この高周波加熱装置は、図６の加熱室の要部断面図に示すように本体内に加熱室１を設け、加熱室１を構成する加熱室上壁２および底壁３に対し、それぞれ加熱室１の前後左右の中心と対称な位置、且つ上壁２側と底壁３側とで異なる中心距離をおいて、上壁２側には右同軸アンテナ４と左同軸アンテナ５、右電界攪拌翼６と左電界攪拌翼７を夫々付加し、底壁側には右同軸アンテナ８と左同軸アンテナ９、右電界攪拌翼１０と左電界攪拌翼１１を夫々付加した高周波給電手段を設けて構成されている。さらに、高周波給電手段の周囲には２個所に独立した円形で加熱室１外に突出した上壁右絞り部１２、上壁左絞り部１３、さらに同様に底壁右絞り部１４、底壁左絞り部１５を夫々設けていた。図７の加熱室底壁の斜視図に底壁３側の右電界攪拌翼１０、左攪拌翼１１と、加熱室１外に突出する底壁右絞り部１４、底壁左絞り部１５を示す。また、高周波供給手段への高周波の励振に係る半波発振を行うマグネトロンの発振位相において、対向反対側同志すなわち加熱室上壁２右と加熱室底壁３左同志あるいは加熱室上壁２左と加熱室底壁３右同志の発振位相を同相となるよう、かつ加熱室上壁２あるいは加熱室底壁３の左右の高周波給電手段への高周波を励振するマグネトロンの発振位相が逆相になるよう位置をずらして構成されていた。
【０００３】
【発明が解決しようとする課題】
しかしながら上記従来の高周波加熱装置では、高周波出力の大きさに関わらず４組の高周波給電手段を必要としている。即ち４組のマグネトロンと導波管と同軸アンテナと電界攪拌翼を必要とし、それらの加熱室への組み込みや、マグネトロンを構成するための電源も複雑になるという課題があった。また、近年ではマグネトロンの性能向上と冷却の性能向上により、マグネトロン１個当たり高周波出力が１０００Ｗを出すことが可能になってきている。従って高周波出力が２０００Ｗ以下の高周波加熱装置を構成する場合、２個のマグネトロンで十分高周波出力を出す能力を持っており、２組の高周波給電手段で良いことになる。しかしながら加熱室の底壁の幅寸法が奥行き寸法とほぼ同じであれば、図８の加熱室の断面図に示すように、２組の高周波給電手段を加熱室の上下で構成し、高周波給電手段の周囲に円形の加熱室外に突出する上壁絞り部１６と底壁絞り部１７を設けさえすれば、被加熱物をむらなく均一に加熱することができるが、加熱室の底壁の幅寸法が奥行き寸法より大きい場合、２組の高周波給電手段を加熱室の上下で構成し、高周波給電手段の周囲に円形の加熱室外に突出する絞り部を設けても、加熱室の底壁面が長方形のため、高周波電波を被加熱物に均一に当てることが困難であり、被加熱物をむらなく均一にできないという課題があった。
【０００４】
【課題を解決するための手段】
本発明は上記課題を解決するため、加熱室の底壁の幅寸法が奥行き寸法より大きい加熱室と、この加熱室の底壁に加熱室外へ突出し底壁の幅と平行する長円形状の絞り部を形成し、電動機で回転する同軸アンテナと回転放射体をその略中心に位置させ、回転放射体の加熱室底壁幅方向の左右に長円形状の絞り部に架設する平面状の金具を少なくとも１対構成したものである。
【０００５】
上記発明によれば、加熱室の底壁の幅寸法が奥行き寸法より大きくても、回転放射体の加熱室底壁幅方向の左右に長円形状の絞り部に架設する平面状の金具を少なくとも１対構成しているので、高周波を発振するマグネトロンよりの高周波電波を加熱室に導波管で伝搬させ、その高周波電波を同軸アンテナと回転放射体で３６０度回転しながら放射し、その高周波電波を回転放射体の周囲、および長円形状の絞り部の両側の半円状開口部より放射することにより、被調理物をむらなく均一に加熱することができる。
【０００６】
また、回転放射体の加熱室底壁幅方向の左右に長円形状の絞り部を架設する平面状の金具を少なくとも１対構成したが、平面状の金具の代わりに「Ｕ字」伏せ型トンネル状、あるいは「コ字」伏せ型トンネル状の金具を、長円形状の絞り部の中心に設けた回転放射体の加熱室底壁幅方向の長円形状の絞り部内の左右に構成しても、被調理物をむらなく均一に加熱することができる。
【０００７】
また、さらに加熱室上壁面の中心にも、高周波電波を加熱室内に放射する同軸アンテナと回転放射体とを備えることにより、加熱室底壁の同軸アンテナと回転放射体からの高周波電波と、加熱室上壁の同軸アンテナと回転放射体にマグネトロンより導波管で伝搬された高周波電波と相まって被加熱物に放射させることになり、被調理物をよりむらなく均一に加熱することができる。
【０００８】
【発明の実施の形態】
本発明の請求項１にかかる高周波加熱装置は、被加熱物を収納する加熱室の底壁の幅寸法が奥行き寸法より大きい加熱室と、高周波を発振するマグネトロンと、前記マグネトロンよりの高周波電波を前記加熱室に伝搬させる導波管と、前記導波管によって伝搬された高周波電波を前記加熱室内に放射する同軸アンテナと、前記同軸アンテナを回転する電動機と、前記同軸アンテナに固定された回転放射体とを備え、前記加熱室の底壁に前記加熱室外へ突出し前記底壁の幅と平行する長円形状の絞り部を形成し、前記回転放射体をその略中心に位置させ、前記回転放射体の前記加熱室底壁幅方向の左右に前記長円形状の絞り部に架設する平面状の金具を少なくとも１対有するものである。
【０００９】
そして、高周波を発振するマグネトロンよりの高周波電波を加熱室に導波管で伝搬させ、その高周波電波を同軸アンテナと回転放射体で３６０度回転しながら放射し、その高周波電波を回転放射体の周囲、および長円形状の絞り部の両側の半円状開口部より放射することにより、被調理物をむらなく均一に加熱することができる。
【００１０】
本発明の請求項２にかかる高周波加熱装置は、加熱室の底壁の幅寸法が奥行き寸法より大きく、前記加熱室の底壁に前記加熱室外へ突出し前記底壁の幅と平行する長円形状の絞り部内に、少なくとも１対の「Ｕ字」伏せ型トンネル状、あるいは「コ字」伏せ型トンネル状の金具を、長円形状の絞り部の略中心に設けた回転放射体の加熱室底壁幅方向の長円形状の絞り部内の左右に有するものである。
【００１１】
そして、高周波を発振するマグネトロンよりの高周波電波を加熱室に導波管で伝搬させ、その高周波電波を同軸アンテナと回転放射体で３６０度回転しながら放射し、その高周波電波を回転放射体の周囲、および長円形状の絞り部の両側の半円状開口部より放射することにより、被調理物をむらなく均一に加熱することができる。
【００１２】
本発明の請求項３にかかる高周波加熱装置は、さらに、加熱室上壁面の中心にも、同軸アンテナと回転放射体を有したものである。
【００１３】
そして、加熱室底壁の同軸アンテナと回転放射体からの高周波電波と、加熱室上壁の同軸アンテナと回転放射体にマグネトロンより導波管で伝搬された高周波電波と相まって被加熱物に放射させることになり、被調理物をよりむらなく均一に加熱することができるものである。
【００１４】
【実施例】
以下、本発明の実施例について図面を用いて説明する。
【００１５】
（実施例１）
図１は本発明の実施例１の高周波加熱装置を示す加熱室底部概略斜視図、図２は同高周波加熱装置の加熱室の底壁の概略斜視図である。
【００１６】
図１、図２において、１６は加熱室でありその加熱室１６の下部に被調理物１７をを載置する誘電体製の載置台１８を設けてあり、加熱室１６の底壁１９に加熱室１６外へ突出する長円形状の絞り部２０を形成し、その中心に電動機２１の誘電体製の出力軸と接続された同軸アンテナ２２とそれに固定された回転放射体２３が設けられている。また加熱室底壁１９の外部には、高周波電波を導く導波管２４が加熱室底壁１９に固定され、その導波管２４の加熱室１６の中心の下部に、同軸アンテナ２２と出力軸で接続された電動機２１が固定され、さらに導波管２４の他端にはマグネトロン２５が固定されている。しかも、回転放射体２３の底壁１９の幅方向の左右に長円形状の絞り部２０を架設する右平面状金具２６と左平面状金具２７を設けられている。
【００１７】
次に動作、作用について説明する。高周波を発振するマグネトロン２５からの高周波電波は、導波管２４によって加熱室１６と高周波電界結合する同軸アンテナ２２に導かれ、回転放射体２３で加熱室１６へ高周波電波を放射する。また、回転放射体２３は電動機２１で回転運動するため、高周波電波は加熱室底壁１９の回転放射体２３を中心に３６０度の角度に放射し、また長円形状の絞り部２０と右平面状金具２６で構成した半円状開口部および長円形状の絞り部２０と左平面状金具２７で構成した半円状開口部より高周波電波を放射し、載置台１８に置いた被調理物１７にむらなく高周波電波を照射することができる。
【００１８】
（実施例２）
図３は本発明の実施例２の高周波加熱装置の加熱室部分の要部断面図である。図４は同高周波加熱装置を示す加熱室底部概略斜視図である。なお、実施例１と同一符号のものは同一構造を有し、説明は省略する。
【００１９】
本実施例２において、実施例１と異なる点は長円形状の絞り部２０内の構成であり、実施例１では長円形状の絞り部２０を架設する右平面状の金具２６と左平面状の金具２７を設けたが、長円形状の絞り部２０の中心に設けた回転放射体２３の加熱室底壁幅方向の長円形状絞り部内の左右に、「コ字」伏せ型トンネル状の金具３０と金具３１を長円形状の絞り部２０に設けられている。
【００２０】
次に動作、作用について説明する。高周波を発振するマグネトロンからの高周波電波は、導波管２４によって加熱室１６と高周波電界結合する同軸アンテナ２２に導かれ、回転放射体２９で加熱室１６へ高周波電波を放射する。また回転放射体２３は電動機２１で回転運動するため、高周波電波は加熱室底壁１９の回転放射体２３を中心に３６０度の角度に放射し、また長円形状の絞り部２０の加熱室底壁１９幅方向の左右に設けた「コ字」伏せ型トンネル状の金具３０と金具３１を高周波電波が通過し、長円形状の絞り部２０の両側面に放射する。従って、載置台に置いた被調理物にむらなく高周波電波を照射することができる。
【００２１】
なお、金具の形状を「コ字」伏せ型トンネル状としたが、「Ｕ字」伏せ型トンネル状とすることもできるものである。
【００２２】
（実施例３）
図５は本発明の実施例３の高周波加熱装置を示す加熱室の断面図である。本実施例３において、実施例１と異なる点は加熱室上壁３２の中心にも、回転放射体３３を付加したものである。なお、実施例１と同一符号のものは同一構造を有し、説明は省略する。
【００２３】
次に動作、作用を説明する。加熱室底壁１９に設けた回転放射体２３からの高周波電波と、加熱室底壁１９に設けた長円形状の絞り部２０と左右平面状の金具２６、２７で構成した半円状開口部より高周波電波を放射することにより、載置台に置いた被調理物にむらなく高周波電波を照射するのは同じであるが、加熱室上壁３２にも回転放射体３３を付加したことにより、高周波を発振するマグネトロン３４からの高周波電波は、導波管３５によって加熱室と高周波電界結合する同軸アンテナ３６に導かれ、回転放射体３３で加熱室へ高周波電波を放射する。また回転放射体３３は電動機３７で回転運動するため、高周波電波は加熱室上壁３２の回転放射体３３を中心に３６０度の角度に放射し、また加熱室上壁３２の絞り部３８に高周波電波を放射することにより、加熱室底壁１９の回転放射体２３からの高周波電波と相まって、載置台１８に置いた被調理物１７にさらにむらなく均一に高周波電波を照射することができる。
【００２４】
【発明の効果】
以上説明したように本発明の請求項１に係る高周波加熱装置は、加熱室の底壁の長円形状の絞り部に、回転放射体の加熱室底壁幅方向の左右に長円形状の絞り部を架設する平面状の金具を少なくとも１対有し構成しているので、加熱室の幅寸法が奥行き寸法より大きくても、高周波を発振するマグネトロンよりの高周波電波を加熱室に導波管で伝搬させ、その高周波電波を回転放射体で３６０度回転しながら放射し、その高周波電波を回転放射体の周囲、および長円形状の絞り部の両側の半円状開口部より放射することにより、被調理物をむらなく均一に加熱することができる。
【００２５】
また、請求項２に係る高周波加熱装置は、加熱室の底壁の長円形状の絞り部に、回転放射体の加熱室底壁幅方向の長円形状の絞り部内の左右に少なくとも１対の「Ｕ字」伏せ型トンネル状、あるいは「コ字」伏せ型トンネル状の金具を設けたので、高周波を発振するマグネトロンよりの高周波電波を加熱室に導波管で伝搬させ、その高周波電波を回転放射体で３６０度回転しながら放射し、また長円形状の絞り部の「Ｕ字」伏せ型トンネル状、あるいは「コ字」伏せ型トンネル状の金具の下部を高周波電波が通過し、長円形状の絞り部の両側面に放射することにより、被調理物をむらなく均一に加熱することができる。
【００２６】
また、請求項３に係る高周波加熱装置は、加熱室底壁に設けた回転放射体からの高周波電波と、加熱室底板に設けた長円形状の絞り部と左右平面状の金具で構成した半円状開口部より高周波電波を放射することにより、載置台に置いた被調理物にむらなく高周波電波を照射するのは同じであるが、加熱室上壁にも回転放射体を付加したことにより、高周波を発振するマグネトロンからの高周波電波は、導波管によって加熱室と高周波電界結合する同軸アンテナに導かれ、回転放射体で加熱室へ高周波電波を放射する。また回転放射体は電動機で回転運動するため、高周波電波は加熱室上壁の回転放射体を中心に３６０度の角度に放射し、また加熱室上壁の絞り部に高周波電波を放射することにより、加熱室底壁の回転放射体からの高周波電波と相まって、載置台に置いた被調理物にさらにむらなく均一に高周波電波を照射し、被調理物を加熱できる。
【図面の簡単な説明】
【図１】本発明の実施例１における高周波加熱装置の加熱室部分の断面図
【図２】同高周波加熱装置の加熱室底壁の概略斜視図
【図３】本発明の実施例２における高周波加熱装置の加熱室部分の要部断面図
【図４】同高周波加熱装置の加熱室底壁の概略斜視図
【図５】本発明の実施例３における高周波加熱装置の加熱室部分の断面図
【図６】従来の高周波加熱器の加熱室の断面図
【図７】従来の高周波加熱器の加熱室底壁の概略斜視図
【図８】従来の高周波加熱器の加熱室の断面図
【図９】従来の高周波加熱器の加熱室底壁の概略斜視図
【符号の説明】
１６加熱室
１７被加熱物
１９加熱室底壁
２０絞り部
２１電動機
２２同軸アンテナ
２３回転放射体
２４導波管
２５マグネトロン
２６，２７平面状の金具[0001]
BACKGROUND OF THE INVENTION
The present invention relates to improvement of the heating efficiency of a high-frequency heating device such as a microwave oven, and more particularly to a suspension-type high-frequency heating device in which the width dimension of the heating chamber has a large ratio to the depth dimension.
[0002]
[Prior art]
A conventional high-frequency heating apparatus of this kind is generally as described in JP-A-3-15190. This high-frequency heating apparatus is provided with a heating chamber 1 in the main body as shown in the cross-sectional view of the main part of the heating chamber in FIG. 6, and the heating chamber is separated from the heating chamber upper wall 2 and bottom wall 3 constituting the heating chamber 1. 1 symmetric with respect to the front, back, left and right centers, and at different center distances between the upper wall 2 side and the bottom wall 3 side, the right coaxial antenna 4 and the left coaxial antenna 5 are provided on the upper wall 2 side, and the right electric field stirring blade. 6 and a left electric field agitating blade 7 are added, respectively, and a high-frequency power feeding means is provided on the bottom wall side to which a right coaxial antenna 8 and a left coaxial antenna 9, and a right electric field agitating blade 10 and a left electric field agitating blade 11 are added. ing. Further, around the high-frequency power feeding means, there are two independent circular shapes that protrude out of the heating chamber 1, and are an upper wall right throttle portion 12, an upper wall left throttle portion 13, and similarly, a bottom wall right throttle portion 14 and a bottom wall left portion. Each of the aperture portions 15 was provided. The perspective view of the bottom wall of the heating chamber in FIG. 7 shows the right electric field stirring blade 10 and the left stirring blade 11 on the bottom wall 3 side, the bottom wall right throttle portion 14 and the bottom wall left throttle portion 15 projecting outside the heating chamber 1. . Further, in the oscillation phase of the magnetron that performs half-wave oscillation related to high-frequency excitation to the high-frequency supply means, the opposing opposite side, that is, the heating chamber upper wall 2 right and the heating chamber bottom wall 3 left side or the heating chamber upper wall 2 left side and The oscillation phase of the right side of the heating chamber bottom wall 3 is in phase, and the oscillation phase of the magnetron that excites high frequency to the left and right high-frequency power feeding means on the heating chamber upper wall 2 or the heating chamber bottom wall 3 is reversed. It was configured by shifting the position.
[0003]
[Problems to be solved by the invention]
However, the conventional high-frequency heating device requires four sets of high-frequency power feeding means regardless of the magnitude of the high-frequency output. That is, four sets of magnetrons, waveguides, coaxial antennas, and electric field agitating blades are required, and there is a problem that their incorporation into the heating chamber and the power source for configuring the magnetron are complicated. Further, in recent years, with the improvement of the performance of the magnetron and the improvement of the cooling performance, it has become possible to provide a high frequency output of 1000 W per magnetron. Therefore, when a high-frequency heating apparatus having a high-frequency output of 2000 W or less is configured, the two magnetrons have a capability of sufficiently outputting a high-frequency output, and two sets of high-frequency power supply means are sufficient. However, if the width dimension of the bottom wall of the heating chamber is almost the same as the depth dimension, as shown in the sectional view of the heating chamber in FIG. As long as the upper wall restricting portion 16 and the bottom wall restricting portion 17 projecting outside the circular heating chamber are provided, the object to be heated can be heated uniformly, but the width of the bottom wall of the heating chamber Is larger than the depth dimension, two sets of high-frequency power feeding means are configured above and below the heating chamber, and the bottom wall surface of the heating chamber is rectangular even if a constricted portion protruding outside the circular heating chamber is provided around the high-frequency power feeding means. For this reason, it is difficult to uniformly apply high-frequency radio waves to an object to be heated, and there is a problem that the object to be heated cannot be uniformly distributed.
[0004]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention provides a heating chamber in which the width dimension of the bottom wall of the heating chamber is larger than the depth dimension, and an oblong aperture that projects out of the heating chamber to the bottom wall of the heating chamber and is parallel to the width of the bottom wall. A flat bracket that is installed on an oblong constriction section on the left and right of the heating radiator bottom wall width direction. At least one pair is configured.
[0005]
According to the above invention, even if the width dimension of the bottom wall of the heating chamber is larger than the depth dimension, at least the planar metal fittings erected on the oblong constricted portions on the left and right in the heating chamber bottom wall width direction of the rotating radiator are provided. Since it is configured as a pair, a high-frequency radio wave from a magnetron that oscillates a high frequency is propagated to the heating chamber through a waveguide, and the high-frequency radio wave is radiated while being rotated 360 degrees with a coaxial antenna and a rotating radiator. Is radiated from the periphery of the rotating radiator and the semicircular openings on both sides of the oval-shaped narrowed portion, so that the food to be cooked can be uniformly heated.
[0006]
In addition, at least one pair of planar metal fittings that erected an ellipse-shaped throttle part on the left and right in the width direction of the bottom wall of the heating radiator is configured. Or “U” shaped tunnel-shaped metal fittings can be configured on the left and right sides of the oblong constriction in the width direction of the heating chamber bottom wall of the rotating radiator provided at the center of the oblong constriction. The object to be cooked can be heated evenly.
[0007]
Further, the center of the upper wall surface of the heating chamber is provided with a coaxial antenna that radiates high-frequency radio waves into the heating chamber and a rotating radiator, so that high-frequency radio waves from the coaxial antenna and the rotating radiator on the bottom wall of the heating chamber can be heated. The object to be heated is radiated to the object to be heated together with the high frequency radio wave propagated from the magnetron through the waveguide on the coaxial antenna and the rotating radiator on the upper wall of the room, and the object to be cooked can be heated more evenly.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The high-frequency heating device according to claim 1 of the present invention is a heating chamber in which the width of the bottom wall of the heating chamber that houses the object to be heated is larger than the depth, a magnetron that oscillates high frequency, and high-frequency radio waves from the magnetron. A waveguide propagating into the heating chamber; a coaxial antenna that radiates high-frequency radio waves propagated through the waveguide into the heating chamber; an electric motor that rotates the coaxial antenna; and a rotary radiation fixed to the coaxial antenna. An oblong constricted portion that protrudes out of the heating chamber and is parallel to the width of the bottom wall on the bottom wall of the heating chamber. It has at least one pair of flat metal fittings erected on the oblong throttle part on the left and right of the body in the width direction of the heating chamber bottom wall.
[0009]
Then, a high frequency radio wave from a magnetron that oscillates a high frequency is propagated to the heating chamber through a waveguide, and the high frequency radio wave is radiated while being rotated 360 degrees by the coaxial antenna and the rotating radiator. By radiating from the semicircular openings on both sides of the oval-shaped narrowed portion, the object to be cooked can be uniformly heated.
[0010]
The high-frequency heating device according to claim 2 of the present invention has an elliptical shape in which the width of the bottom wall of the heating chamber is larger than the depth, and protrudes out of the heating chamber to the bottom wall of the heating chamber and parallel to the width of the bottom wall. The bottom of the heating chamber of the rotating radiator, in which at least one pair of “U-shaped” tunnel-shaped or “U-shaped” tunnel-shaped metal fittings is provided at the approximate center of the oblong-shaped diaphragm. It is provided on the left and right sides of the oblong diaphragm portion in the wall width direction.
[0011]
Then, a high frequency radio wave from a magnetron that oscillates a high frequency is propagated to the heating chamber through a waveguide, and the high frequency radio wave is radiated while being rotated 360 degrees by the coaxial antenna and the rotating radiator. By radiating from the semicircular openings on both sides of the oval-shaped narrowed portion, the object to be cooked can be uniformly heated.
[0012]
The high-frequency heating device according to claim 3 of the present invention further includes a coaxial antenna and a rotating radiator at the center of the upper wall surface of the heating chamber.
[0013]
Then, the high-frequency radio wave from the coaxial antenna and the rotating radiator on the bottom wall of the heating chamber, and the high-frequency radio wave propagated from the magnetron through the waveguide to the coaxial antenna and the rotary radiator on the top wall of the heating chamber are radiated to the object to be heated. That is, the object to be cooked can be heated more evenly and uniformly.
[0014]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0015]
(Example 1)
FIG. 1 is a schematic perspective view of a heating chamber bottom portion showing a high-frequency heating device according to a first embodiment of the present invention, and FIG. 2 is a schematic perspective view of a bottom wall of the heating chamber of the high-frequency heating device.
[0016]
In FIG. 1 and FIG. 2, reference numeral 16 denotes a heating chamber, and a dielectric mounting table 18 on which a cooking object 17 is placed is provided below the heating chamber 16, and the bottom wall 19 of the heating chamber 16 is heated. An ellipse-shaped restricting portion 20 projecting out of the chamber 16 is formed, and a coaxial antenna 22 connected to the dielectric output shaft of the electric motor 21 and a rotating radiator 23 fixed thereto are provided at the center thereof. . A waveguide 24 that guides high-frequency radio waves is fixed to the heating chamber bottom wall 19 outside the heating chamber bottom wall 19, and a coaxial antenna 22 and an output shaft are disposed below the center of the heating chamber 16 of the waveguide 24. And the magnetron 25 is fixed to the other end of the waveguide 24. In addition, a right planar metal fitting 26 and a left planar metal fitting 27 are provided on the left and right of the bottom wall 19 of the rotating radiator 23 in the width direction so that the ellipse-shaped throttle portion 20 is erected.
[0017]
Next, the operation and action will be described. A high frequency radio wave from the magnetron 25 that oscillates a high frequency is guided by the waveguide 24 to the coaxial antenna 22 that is coupled to the heating chamber 16 by a high frequency electric field, and the rotary radiator 23 radiates the high frequency radio wave to the heating chamber 16. Further, since the rotating radiator 23 is rotated by the electric motor 21, high-frequency radio waves are emitted at an angle of 360 degrees around the rotating radiator 23 of the heating chamber bottom wall 19, and the ellipse-shaped throttle portion 20 and the right plane are radiated. A high frequency radio wave is radiated from the semicircular opening formed by the metal fitting 26 and the semicircular opening formed by the oval-shaped narrowing portion 20 and the left flat metal fitting 27, and the cooked object 17 placed on the mounting table 18. High frequency radio waves can be irradiated evenly.
[0018]
(Example 2)
FIG. 3 is a cross-sectional view of the main part of the heating chamber portion of the high-frequency heating device according to the second embodiment of the present invention. FIG. 4 is a schematic perspective view of the bottom of the heating chamber showing the high-frequency heating device. In addition, the thing of the same code | symbol as Example 1 has the same structure, and abbreviate | omits description.
[0019]
The second embodiment is different from the first embodiment in the configuration inside the oval-shaped restricting portion 20. In the first embodiment, the right-planar metal fitting 26 for installing the oblong-shaped restricting portion 20 and the left-planar shape are provided. Of the rotating radiator 23 provided at the center of the oval-shaped throttle portion 20 on the left and right sides of the elliptical-shaped throttle portion in the width direction of the heating chamber bottom wall. The metal fitting 30 and the metal fitting 31 are provided in the ellipse-shaped throttle part 20.
[0020]
Next, the operation and action will be described. A high frequency radio wave from a magnetron that oscillates a high frequency is guided by a waveguide 24 to a coaxial antenna 22 that is coupled to the heating chamber 16 by a high frequency electric field, and the rotary radiator 29 radiates the high frequency radio wave to the heating chamber 16. Further, since the rotating radiator 23 is rotated by the electric motor 21, high-frequency radio waves are radiated at an angle of 360 degrees around the rotating radiator 23 of the heating chamber bottom wall 19, and the heating chamber bottom of the ellipse-shaped throttle portion 20 is radiated. High-frequency radio waves pass through the “U” -shaped tunnel-shaped metal fittings 30 and 31 provided on the left and right sides of the wall 19 in the width direction, and radiate to both sides of the oval diaphragm 20. Therefore, it is possible to irradiate the object to be cooked placed on the mounting table evenly with high frequency radio waves.
[0021]
The shape of the metal fitting is a “U-shaped” tunnel type, but it can also be a “U-shaped” tunnel type.
[0022]
(Example 3)
FIG. 5 is a sectional view of a heating chamber showing a high-frequency heating device according to Embodiment 3 of the present invention. The third embodiment is different from the first embodiment in that a rotating radiator 33 is also added to the center of the heating chamber upper wall 32. In addition, the thing of the same code | symbol as Example 1 has the same structure, and abbreviate | omits description.
[0023]
Next, the operation and action will be described. A semicircular opening made up of a high-frequency radio wave from the rotating radiator 23 provided on the heating chamber bottom wall 19, an oval throttle portion 20 provided on the heating chamber bottom wall 19, and left and right planar metal fittings 26 and 27. Although it is the same to irradiate the cooking object placed on the mounting table evenly by radiating the high-frequency radio wave, the high-frequency radio wave is applied to the upper wall 32 of the heating chamber. The high-frequency radio wave from the magnetron 34 that oscillates is guided to the coaxial antenna 36 that is coupled to the heating chamber by a high-frequency electric field by the waveguide 35, and the rotary radiator 33 radiates the high-frequency radio wave to the heating chamber. Further, since the rotating radiator 33 is rotated by the electric motor 37, high-frequency radio waves are radiated at an angle of 360 degrees around the rotating radiator 33 of the heating chamber upper wall 32, and the high-frequency waves are applied to the throttle portion 38 of the heating chamber upper wall 32. By radiating the radio wave, the cooked object 17 placed on the mounting table 18 can be evenly and evenly irradiated with the high frequency radio wave from the rotating radiator 23 on the bottom wall 19 of the heating chamber.
[0024]
【The invention's effect】
As described above, the high-frequency heating device according to claim 1 of the present invention has an elliptical constriction on the left and right of the rotating radiator in the width direction of the heating chamber bottom wall. Since there is at least one pair of planar metal fittings for erection of the part, even if the width dimension of the heating chamber is larger than the depth dimension, the high frequency radio wave from the magnetron that oscillates the high frequency is supplied to the heating chamber by the waveguide. Propagating and radiating the high-frequency radio wave while rotating 360 degrees with the rotating radiator, and radiating the high-frequency radio wave from the semicircular opening around the rotating radiator and on both sides of the oblong aperture part, The object to be cooked can be heated evenly.
[0025]
In addition, the high-frequency heating device according to claim 2 includes at least one pair of left and right inside the oblong constricted portion of the rotating radiator in the width direction of the heating chamber bottom wall in the oblong constricted portion of the bottom wall of the heating chamber. Since a “U-shaped” tunnel-shaped or “U-shaped” tunnel-shaped metal fitting is provided, high-frequency radio waves from a magnetron that oscillates high-frequency waves are propagated through the waveguide into the heating chamber, and the high-frequency radio waves rotate. The radiator radiates while rotating 360 degrees, and high-frequency radio waves pass through the lower part of the “U” -shaped tunnel-shaped or “U-shaped” tunnel-shaped metal fittings in the oblong aperture. By radiating to both side surfaces of the shaped squeezed portion, the object to be cooked can be uniformly heated.
[0026]
In addition, the high-frequency heating device according to claim 3 is a semi-structure composed of a high-frequency radio wave from a rotating radiator provided on the bottom wall of the heating chamber, an oblong throttle portion provided on the bottom plate of the heating chamber, and a left and right planar metal fitting. By radiating high-frequency radio waves from the circular opening, it is the same that the high-frequency radio waves are evenly irradiated to the cooking object placed on the mounting table, but by adding a rotating radiator to the upper wall of the heating chamber The high-frequency radio wave from the magnetron that oscillates the high frequency is guided to the coaxial antenna that is coupled to the heating chamber by a high-frequency electric field by the waveguide, and the high-frequency radio wave is radiated to the heating chamber by the rotating radiator. In addition, since the rotating radiator rotates with an electric motor, high-frequency radio waves are emitted at an angle of 360 degrees around the rotating radiator on the upper wall of the heating chamber, and high-frequency radio waves are radiated to the constricted portion on the upper wall of the heating chamber. Combined with the high-frequency radio wave from the rotating radiator on the bottom wall of the heating chamber, the object to be cooked placed on the mounting table can be evenly and evenly irradiated with the high-frequency radio wave to heat the object to be cooked.
[Brief description of the drawings]
1 is a cross-sectional view of a heating chamber portion of a high-frequency heating device according to a first embodiment of the present invention. FIG. 2 is a schematic perspective view of a bottom wall of the heating chamber of the high-frequency heating device. FIG. 4 is a schematic perspective view of the heating chamber bottom wall of the high-frequency heating device. FIG. 5 is a cross-sectional view of the heating chamber portion of the high-frequency heating device in Example 3 of the present invention. 6 is a cross-sectional view of the heating chamber of the conventional high-frequency heater. FIG. 7 is a schematic perspective view of the bottom wall of the heating chamber of the conventional high-frequency heater. FIG. 8 is a cross-sectional view of the heating chamber of the conventional high-frequency heater. ] Schematic perspective view of heating chamber bottom wall of conventional high-frequency heater [Explanation of symbols]
DESCRIPTION OF SYMBOLS 16 Heating chamber 17 Object to be heated 19 Heating chamber bottom wall 20 Restriction part 21 Electric motor 22 Coaxial antenna 23 Rotating radiator 24 Waveguide 25 Magnetron 26, 27 Planar metal fittings

Claims

A heating chamber in which the width of the bottom wall of the heating chamber in which the object to be heated is stored is larger than the depth size, a magnetron that oscillates high frequency, a waveguide that propagates high-frequency radio waves from the magnetron to the heating chamber, and the guide A coaxial antenna that radiates high-frequency radio waves propagated by a wave tube into the heating chamber, an electric motor that rotates the coaxial antenna, and a rotating radiator fixed to the coaxial antenna, and heating the bottom wall of the heating chamber An ellipse-shaped constricted portion projecting out of the room and parallel to the width of the bottom wall is formed, the rotating radiator is positioned at the approximate center thereof, and the length of the rotating radiator is determined to the left and right in the heating chamber bottom wall width direction. A high-frequency heating apparatus in which at least one pair of planar metal fittings installed on a circular throttle portion is configured.

At least one pair of “U” -shaped tunnel-shaped or “U” -shaped tunnel-shaped metal fittings provided in the center of the oblong constricted portion in the width direction of the heating chamber bottom wall. The high-frequency heating device according to claim 1, wherein the high-frequency heating device is configured on the left and right sides of the circular throttle portion.

The high-frequency heating apparatus according to claim 1 or 2, wherein a coaxial antenna and a rotating radiator are added to the center of the upper wall surface of the heating chamber.