JP2011103184A - High-frequency heating device - Google Patents

High-frequency heating device Download PDF

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Publication number
JP2011103184A
JP2011103184A JP2009256739A JP2009256739A JP2011103184A JP 2011103184 A JP2011103184 A JP 2011103184A JP 2009256739 A JP2009256739 A JP 2009256739A JP 2009256739 A JP2009256739 A JP 2009256739A JP 2011103184 A JP2011103184 A JP 2011103184A
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choke
opening
door
frequency
peripheral edge
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Yoshiharu Omori
義治 大森
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Panasonic Corp
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Panasonic Corp
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    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00Heating by electric, magnetic or electromagnetic fields
    • H05B6/64Heating using microwaves
    • H05B6/76Prevention of microwave leakage, e.g. door sealings
    • H05B6/763Microwave radiation seals for doors

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Constitution Of High-Frequency Heating (AREA)
  • Electric Ovens (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To achieve a choke structure of a high-frequency heating device easy to manufacture while securing high-frequency shielding performance through prevention of progress of high frequencies propagated along a door choke groove in a simple structure. <P>SOLUTION: In the high-frequency heating device including a heating chamber 1 with an opening 3 for housing a heated object 10 inside, a door 4 covering the opening 3 in free opening and closing, an opening peripheral edge portion 5 fitted around the opening 3 in opposition to the door 4, and a high-frequency supply unit 2 supplying high frequencies into the heating chamber 1, the door 4 has a choke structure opposed to the opening peripheral edge portion 5 at a closed state of the door 4, and the choke structure is of a structure having choke elements 9 divided by slits 6 and with a bag-like cross section, the choke elements 9 being periodically arranged in a comblike form, and being provided in opposition to a periodic structure direction at parts where the periodic makeup of the choke structure gets discontinuous, with an interval between the choke elements 9 to be a terminal of a periodic structure of the choke structure and the opening peripheral edge portion made narrower than between the choke elements 9 other than at the terminal of the periodic structure of the choke structure and the opening peripheral edge portion 5. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、チョーク構造を用いて、加熱室とドアの間から外部に漏洩しようとする高周波を遮蔽する高周波加熱装置に関するものである。   The present invention relates to a high-frequency heating apparatus that uses a choke structure to shield a high frequency that is about to leak from between a heating chamber and a door.

従来のこの種の高周波加熱装置は、インピーダンス反転方法を実現するチョーク溝をドアに設置し、そのチョーク構造にスリットを設けた周期的な櫛歯形状とし、設置辺毎に周期を異なるようにするものがある(例えば、特許文献1参照)。そして、電子レンジの加熱室とドアの隙間を通ってドア外側へと漏洩しようとする高周波をチョーク構造と、この周期的構成により減衰するが、周期的構成の間隔を設置辺毎に調整することでより減衰効果を高めるとしている。   In this type of conventional high-frequency heating device, a choke groove that realizes the impedance reversal method is installed in the door, and the choke structure has a periodic comb-teeth shape with slits, so that the period is different for each installation side. There are some (see, for example, Patent Document 1). And the high frequency which is going to leak to the outside of the door through the gap between the heating chamber of the microwave and the door is attenuated by the choke structure and this periodic structure, but the interval of the periodic structure should be adjusted for each installation side. In order to increase the damping effect.

ドア隅角部に臨む2辺の周期的構成体を電気的に接続する連結片を設けたものがある(例えば、特許文献2参照)。そして、周期的構成体をよりドアの角に接近して設置でき、減衰効果を高めるとしている。   There is one provided with a connecting piece that electrically connects two sided periodic structures facing a door corner (for example, see Patent Document 2). The periodic structure can be installed closer to the corner of the door to increase the damping effect.

加熱室開口周囲のフランジ部に対向して、ドア端部から延設しチョークを構成する張出し面のドア隅角部近傍の長さを違えたものがある(例えば、特許文献3参照)。そして、ドア隅角部近傍では、チョーク構造の開口幅が広くなるため、張出し面を部分的に長くすることで共振周波数を調整し、減衰効果を維持するとしている。   There are some which have different lengths near the door corners of the overhanging surface which extends from the door end and constitutes the choke, facing the flange around the opening of the heating chamber (for example, see Patent Document 3). Since the opening width of the choke structure is wide in the vicinity of the door corner, the resonance frequency is adjusted by partially extending the overhanging surface to maintain the damping effect.

特開2007−317607号公報JP 2007-317607 A 特許第2957833号公報Japanese Patent No. 2957833 特許第3249240号公報Japanese Patent No. 3249240

上記周期的構成はドアチョーク溝に沿って伝播する高周波に対して遅波回路の原理で働き、伝播を阻止するものであるが、ドアコーナー近傍ではドアコーナーから外側には周期的構成の繰返しがなく、十分な効果が期待できないため、周期的構成の間隔を設置辺毎に調整するものは、各設置辺中間での減衰効果を高められてもドアコーナーの減衰効果を確保することはできない。   The above-mentioned periodic structure works on the principle of a slow wave circuit for high frequencies propagating along the door choke groove and prevents propagation. However, in the vicinity of the door corner, the periodic structure repeats from the door corner to the outside. In addition, since a sufficient effect cannot be expected, adjusting the interval of the periodic configuration for each installation side cannot secure the door corner attenuation effect even if the attenuation effect in the middle of each installation side can be enhanced.

ドア隅角部に臨む2辺の周期的構成体を電気的に接続する連結片を設けたものは、チョーク構造をドアコーナーに寄せて、チョーク溝としての減衰効果が得られる範囲を広められるが、ドアチョーク溝に沿って伝播する高周波に対しての効果は無く、構造も複雑になってしまう。   In the case of providing a connecting piece that electrically connects two periodic components facing the corner of the door, the choke structure can be moved to the door corner to widen the range in which the damping effect as a choke groove can be obtained. There is no effect on high frequencies propagating along the door choke groove, and the structure becomes complicated.

ドア端部から延設しチョークを構成する張出し面のドア隅角部近傍の長さを違えたものは、ドアコーナーでチョーク溝寸法がずれるのを補正し、チョーク溝としての減衰効果を確保するが、ドアチョーク溝に沿って伝播する高周波に対しての効果は無い。   If the length of the projecting surface that extends from the end of the door and has a different length near the corner of the door is corrected, the choke groove dimension is corrected at the door corner to ensure the damping effect as a choke groove. However, there is no effect on the high frequency propagating along the door choke groove.

以上のように、従来の高周波加熱装置では、ドアチョーク溝に沿って伝播する高周波をドアコーナーで阻止することが難しく、構造が複雑になるという課題を有していた。   As described above, the conventional high-frequency heating apparatus has a problem that it is difficult to prevent high-frequency waves propagating along the door choke groove at the door corner, and the structure becomes complicated.

本発明は、上記従来の課題を解決するもので、単純な構成でドアチョーク溝に沿って伝播する高周波をドアコーナーで阻止し、製造しやすく高周波遮蔽性能を確保した高周波加熱装置を提供することを目的とする。   The present invention solves the above-described conventional problems, and provides a high-frequency heating device that prevents high-frequency waves propagating along a door choke groove with a simple structure at a door corner, is easy to manufacture, and ensures high-frequency shielding performance. With the goal.

上記従来の課題を解決するために、本発明の高周波加熱装置は、開口部を有し内部に被加熱物を収容する加熱室と、前記開口部を開閉自在に覆うドアと、前記開口部の周囲に前記ドアと対向して設けられた開口周縁部と、前記加熱室内に高周波を供給する高周波供給手段とを備えた高周波加熱装置であって、前記ドアが、前記ドアの閉状態において前記開口周縁部と対向するチョーク構造を有し、前記チョーク構造が、スリットで区切られ袋状断面を有するチョーク素子を櫛歯状に周期的に配置した構成であり、前記チョーク構造の周期的構成の終端となる前記チョーク素子と前記開口周縁部との間隔が、前記チョーク構造の周期的構成の終端以外の前記チョーク素子と前記開口周縁部との間隔より狭いものである。   In order to solve the above-described conventional problems, a high-frequency heating device according to the present invention includes a heating chamber that has an opening and accommodates an object to be heated, a door that covers the opening so as to be openable and closable, A high-frequency heating device comprising an opening peripheral portion provided around the door so as to face the door, and high-frequency supply means for supplying a high frequency into the heating chamber, wherein the door is open when the door is closed. A choke structure opposed to a peripheral edge, wherein the choke structure is a structure in which choke elements having a bag-like cross section separated by slits are periodically arranged in a comb-like shape, and an end of the periodic structure of the choke structure The distance between the choke element and the opening periphery is narrower than the distance between the choke element and the opening periphery other than the end of the periodic structure of the choke structure.

これによって、単純な構成でドアチョーク溝に沿って伝播する高周波をドアコーナーで阻止し、製造しやすく高周波遮蔽性能を確保した高周波加熱装置を実現することができる。   Accordingly, it is possible to realize a high-frequency heating device that prevents high-frequency waves propagating along the door choke groove with a simple configuration at the door corner, is easy to manufacture, and ensures high-frequency shielding performance.

本発明の高周波加熱装置は、高周波遮蔽性能を確保しながら単純で製造しやすい構成とすることができる。   The high-frequency heating device of the present invention can be configured to be simple and easy to manufacture while ensuring high-frequency shielding performance.

一般的な高周波加熱装置の斜視図Perspective view of a general high-frequency heating device 一般的な高周波加熱装置の断面図Sectional view of a typical high-frequency heating device 従来の高周波加熱装置における高周波遮蔽部の斜視図The perspective view of the high frequency shielding part in the conventional high frequency heating apparatus 本発明の実施の形態における高周波遮蔽部の構成図Configuration diagram of a high-frequency shielding unit in an embodiment of the present invention 本発明の実施の形態における高周波遮蔽部の斜視図The perspective view of the high frequency shielding part in an embodiment of the invention

第1の発明は、開口部を有し内部に被加熱物を収容する加熱室と、開口部を開閉自在に覆うドアと、開口部の周囲にドアと対向して設けられた開口周縁部と、加熱室内に高周波を供給する高周波供給手段とを備えた高周波加熱装置であって、ドアが、ドアの閉状態において開口周縁部と対向するチョーク構造を有し、チョーク構造が、スリットで区切られ袋状断面を有するチョーク素子を櫛歯状に周期的に配置した構成であり、チョーク構造の周期的構成の終端となるチョーク素子と開口周縁部との間隔が、チョーク構造の周期的構成の終端以外のチョーク素子と開口周縁部との間隔より狭いものであり、周期的構成の終端で、ドアチョーク溝に沿った高周波の伝播路をほぼ短絡状態として遮断することで、単純な構成で製造しやすく高周波遮蔽性能を確保した高周波加熱装置を実現することができる。   A first invention includes a heating chamber having an opening and containing an object to be heated therein, a door that covers the opening so as to be openable and closable, and an opening peripheral portion provided around the opening so as to face the door A high-frequency heating device comprising a high-frequency supply means for supplying a high frequency into the heating chamber, wherein the door has a choke structure facing the opening peripheral edge in the closed state of the door, and the choke structure is separated by a slit The choke elements having a bag-like cross section are periodically arranged in a comb-like shape, and the interval between the choke element that is the end of the choke structure and the peripheral edge of the opening is the end of the choke structure. It is narrower than the gap between the choke element and the peripheral edge of the opening, and at the end of the periodic structure, the high-frequency propagation path along the door choke groove is cut off as a nearly short-circuited state. Easy high frequency It is possible to realize a high-frequency heating apparatus to ensure 蔽 performance.

第2の発明は、特に第1の発明のチョーク構造の周期的構成の終端となるチョーク素子の開口周縁部に対向する面の一部が開口周縁部に近接するものであり、ドアチョーク溝に沿った高周波の伝播路を簡単な構成でほぼ短絡状態とし、製造しやすく高周波遮蔽性能を確保した高周波加熱装置を実現することができる。   In the second invention, in particular, a part of the surface facing the opening peripheral edge of the choke element which is the terminal of the periodic structure of the choke structure of the first invention is close to the opening peripheral edge. A high-frequency heating device that is easy to manufacture and secures high-frequency shielding performance can be realized by making the high-frequency propagation path along the short circuit state with a simple configuration.

第3の発明は、特に第1の発明のドアのコーナー部で、2辺のチョーク構造の周期的構成の直交する位置の近傍にチョーク構造の周期的構成の終端となるチョーク素子が設けられ、チョーク構造の周期的構成の終端となるチョーク素子と開口周縁部との間隔が、チョ
ーク構造の周期的構成の終端以外のチョーク素子と開口周縁部との間隔より狭いものであり、2辺のドアチョーク溝に沿ってドアコーナーに向かって伝播する高周波を1つのチョーク素子により遮断し、単純な構成で製造しやすく高周波遮蔽性能を確保した高周波加熱装置を実現することができる。
In the third aspect of the invention, a choke element serving as a terminal end of the periodic structure of the choke structure is provided in the vicinity of the position perpendicular to the periodic structure of the two-side choke structure, particularly in the corner portion of the door of the first invention. The distance between the choke element which is the terminal of the periodic structure of the choke structure and the peripheral edge of the opening is narrower than the distance between the choke element other than the terminal of the periodic structure of the choke structure and the peripheral edge of the opening. A high-frequency heating device that blocks high-frequency waves propagating along the choke groove toward the door corner with a single choke element, is easy to manufacture with a simple configuration, and ensures high-frequency shielding performance.

以下、本発明の実施の形態について、図面を参照しながら説明する。なお、この実施の形態によって本発明が限定されるものではない。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(実施の形態)
図1、2はそれぞれ一般的な高周波加熱装置(電子レンジ)の斜視図、断面図である。図3は、従来の高周波加熱装置における高周波遮蔽部を示す斜視図である。
(Embodiment)
1 and 2 are a perspective view and a sectional view of a general high-frequency heating device (microwave oven), respectively. FIG. 3 is a perspective view showing a high-frequency shielding part in a conventional high-frequency heating device.

図1、2において、被加熱物10は開閉自在に設置されたドア4を開き、開口部3より加熱室1内に収納され、高周波供給手段2により発生し、加熱室1に供給された高周波によって加熱される。金属材料からなる加熱室1の壁面と金属材料からなるドア4により、供給される高周波を内部に閉じ込める略直方体構造を構成する。   1 and 2, the object to be heated 10 opens the door 4 that can be opened and closed, is stored in the heating chamber 1 through the opening 3, is generated by the high-frequency supply means 2, and is supplied to the heating chamber 1. Heated by. The wall surface of the heating chamber 1 made of a metal material and the door 4 made of a metal material constitute a substantially rectangular parallelepiped structure that confines the supplied high frequency inside.

しかし、開口部3周囲に設けられた金属材料からなる開口周縁部5とドア4の間には隙間7があり、この隙間7から高周波がドア外側に向かって漏洩してゆく。ドア4の周囲にはチョーク溝8が開口周縁部5と対向して設けられ、チョーク溝8の短絡終端からλ/4の距離でインピーダンスを反転して、チョーク開口付近を無限大インピーダンスにして、隙間7からドア外側に向かって漏洩してゆく高周波を遮断する。   However, there is a gap 7 between the opening peripheral portion 5 made of a metal material provided around the opening 3 and the door 4, and high frequency leaks from the gap 7 toward the outside of the door. A choke groove 8 is provided around the door 4 so as to be opposed to the opening peripheral edge portion 5, and the impedance is inverted at a distance of λ / 4 from the short-circuit end of the choke groove 8 to make the vicinity of the choke opening infinite impedance. The high frequency leaking from the gap 7 toward the outside of the door is blocked.

図3において、ドア4のチョーク溝8はチョーク素子9とスリット6の繰り返しによる周期的構成で構成され、チョーク素子9およびスリット6の寸法を最適に設計することでチョーク溝8に沿って伝播する高周波の進行を阻止する。以上のように加熱室1から隙間7をドア外側に向かって漏洩する高周波は、チョーク溝8に対し垂直な成分はチョークの働きで遮断し、平行成分は周期的構成の働きで進行を阻止し、高周波遮蔽性能を確保している。しかし、ドアコーナーでは直行する2辺の周期的構成が終端となり、周期性による高周波の進行を阻止する効果が得られなくなる。   In FIG. 3, the choke groove 8 of the door 4 is constituted by a periodic configuration by repeating the choke element 9 and the slit 6, and propagates along the choke groove 8 by optimally designing the dimensions of the choke element 9 and the slit 6. Prevent high-frequency progression. As described above, the high-frequency component leaking from the heating chamber 1 toward the outside of the door is blocked by the component perpendicular to the choke groove 8 by the choke and the progression of the parallel component by the periodic structure. High frequency shielding performance is ensured. However, at the door corner, the periodic structure of two orthogonal sides terminates, and the effect of preventing the high-frequency progression due to the periodicity cannot be obtained.

図4は本発明の実施の形態における高周波遮蔽部の構成図である。開口周縁部5とドア4の隙間7をチョーク溝8に沿って伝播する高周波は、チョーク素子9とスリット6の繰り返しで構成される周期的構成で阻止されるが、ドアコーナー近辺の漏洩電波12には周期的構成終端のため進行阻止効果が得られない。終端チョーク素子11は、開口周縁部5と一部が接触する程に隙間7が狭く、漏洩電波12の伝播路をほぼ短絡することで遮断する。   FIG. 4 is a configuration diagram of the high-frequency shielding unit in the embodiment of the present invention. High-frequency waves propagating along the choke groove 8 along the gap 7 between the peripheral edge 5 of the opening 4 and the door 4 are blocked by a periodic configuration formed by repetition of the choke element 9 and the slit 6, but leaked radio waves 12 near the door corner. In this case, no progress prevention effect can be obtained due to the periodic structure termination. The termination choke element 11 is cut off by substantially short-circuiting the propagation path of the leaked radio wave 12 because the gap 7 becomes narrow so that a part of the termination choke element 11 comes into contact with the peripheral edge 5.

図5は本発明の実施の形態における高周波遮蔽部の斜視図である。終端チョーク素子11は、チョーク素子9とスリット6の繰り返しで構成される2辺の周期的構成それぞれの並びが直行する位置に設けられ、両方向の漏洩電波の伝播路をほぼ短絡して遮断する。
以上のようにドアチョーク溝に沿って伝播する高周波をドアコーナーで遮断し、単純な構成で製造しやすく高周波遮蔽性能を確保した高周波加熱装置を実現することができる。
FIG. 5 is a perspective view of the high-frequency shielding part in the embodiment of the present invention. The termination choke element 11 is provided at a position where the arrangement of each of the two sides of the periodic structure constituted by the repetition of the choke element 9 and the slit 6 is orthogonal, and blocks the propagation path of the leaked radio waves in both directions by short-circuiting.
As described above, it is possible to realize a high-frequency heating apparatus that blocks high-frequency waves propagating along the door choke groove at the door corner, is easy to manufacture with a simple configuration, and ensures high-frequency shielding performance.

以上のように、本発明にかかる高周波加熱装置は製造しやすい構成で、高周波遮蔽性能を確保でき、電子レンジで代表されるような誘電加熱を利用した加熱装置や生ゴミ処理機、などの用途にも適用できる。   As described above, the high-frequency heating device according to the present invention has a configuration that is easy to manufacture, can ensure high-frequency shielding performance, and is used for a heating device or a garbage disposal machine that uses dielectric heating as typified by a microwave oven. It can also be applied to.

1 加熱室
2 高周波供給手段
3 開口部
4 ドア
5 開口周縁部
6 スリット
7 隙間
8 チョーク溝
9 チョーク素子
10 被加熱物
11 終端チョーク素子
12 漏洩電波
DESCRIPTION OF SYMBOLS 1 Heating chamber 2 High frequency supply means 3 Opening part 4 Door 5 Opening peripheral part 6 Slit 7 Gap 8 Choke groove 9 Choke element 10 To-be-heated object 11 Termination choke element 12 Leakage electric wave

Claims (3)

開口部を有し内部に被加熱物を収容する加熱室と、前記開口部を開閉自在に覆うドアと、前記開口部の周囲に前記ドアと対向して設けられた開口周縁部と、前記加熱室内に高周波を供給する高周波供給手段とを備えた高周波加熱装置であって、前記ドアが、前記ドアの閉状態において前記開口周縁部と対向するチョーク構造を有し、前記チョーク構造が、スリットで区切られ袋状断面を有するチョーク素子を櫛歯状に周期的に配置した構成であり、前記チョーク構造の周期的構成の終端となる前記チョーク素子と前記開口周縁部との間隔が、前記チョーク構造の周期的構成の終端以外の前記チョーク素子と前記開口周縁部との間隔より狭い高周波加熱装置。 A heating chamber having an opening and containing an object to be heated therein, a door that covers the opening in an openable and closable manner, an opening peripheral portion provided around the opening and facing the door, and the heating A high-frequency heating device provided with a high-frequency supply means for supplying high-frequency into the room, wherein the door has a choke structure facing the opening peripheral portion in a closed state of the door, and the choke structure is a slit. The choke elements having a bag-shaped cross section that are partitioned are periodically arranged in a comb-like shape, and the choke element that is the terminal of the periodic structure of the choke structure has an interval between the opening peripheral portion and the choke structure. A high-frequency heating apparatus narrower than the distance between the choke element other than the terminal end of the periodic structure and the peripheral edge of the opening. 前記チョーク構造の周期的構成の終端となる前記チョーク素子の前記開口周縁部に対向する面の一部が前記開口周縁部に近接する請求項1に記載の高周波加熱装置。 2. The high-frequency heating device according to claim 1, wherein a part of a surface of the choke element, which is a terminal of the periodic structure of the choke structure, faces the peripheral edge of the opening is close to the peripheral edge of the opening. 前記ドアのコーナー部で、2辺の前記チョーク構造の周期的構成の直交する位置の近傍に前記チョーク構造の周期的構成の終端となる前記チョーク素子が設けられ、前記チョーク構造の周期的構成の終端となる前記チョーク素子と前記開口周縁部との間隔が、前記チョーク構造の周期的構成の終端以外の前記チョーク素子と前記開口周縁部との間隔より狭い請求項1に記載の高周波加熱装置。 In the corner portion of the door, the choke element serving as a terminal of the periodic structure of the choke structure is provided in the vicinity of a position perpendicular to the periodic structure of the choke structure on two sides, and the periodic structure of the choke structure 2. The high-frequency heating device according to claim 1, wherein an interval between the choke element serving as a terminal and the peripheral edge of the opening is narrower than an interval between the choke element other than the terminal of the periodic structure of the choke structure and the peripheral edge of the opening.
JP2009256739A 2009-11-10 2009-11-10 High-frequency heating device Pending JP2011103184A (en)

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JP2011103184A true JP2011103184A (en) 2011-05-26

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