JPH08138847A - Induction heating cooker - Google Patents
Induction heating cookerInfo
- Publication number
- JPH08138847A JPH08138847A JP28104194A JP28104194A JPH08138847A JP H08138847 A JPH08138847 A JP H08138847A JP 28104194 A JP28104194 A JP 28104194A JP 28104194 A JP28104194 A JP 28104194A JP H08138847 A JPH08138847 A JP H08138847A
- Authority
- JP
- Japan
- Prior art keywords
- induction heating
- heating coil
- magnetic field
- circuit device
- inverter circuit
- 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.)
- Pending
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は誘導加熱式炊飯器等にお
いて、誘導加熱コイルから生じる高周波磁界を効果的に
遮蔽し、調理器のインバーター回路装置や調理器外部へ
の磁界漏れを防ぐ誘導加熱式調理器に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction heating type rice cooker or the like, which effectively shields a high frequency magnetic field generated from an induction heating coil to prevent leakage of a magnetic field to an inverter circuit device of a cooking device or the outside of the cooking device. The present invention relates to a cooker.
【０００２】[0002]
【従来の技術】従来この種の誘導加熱式調理器はインバ
ーター回路装置に接続された誘導加熱コイルから発生さ
せる高周波磁界（電波）により、内鍋を誘導加熱するも
のである。この磁界は内鍋にのみ作用するものではな
く、磁界が漏れると本体近傍に置かれた磁性材料からな
る品物（鍋・スプーン等や調理器を設置する台等）も加
熱し発熱させたり、付近のラジオ等に雑音を発生させた
り、さらに、漏れた磁界が誘導加熱式調理器自身のイン
バーター回路装置や配線のための電線等に作用してノイ
ズを発生させ、誤動作の原因となる等の問題がある。2. Description of the Related Art Conventionally, an induction heating type cooker of this kind is one in which an inner pot is induction-heated by a high frequency magnetic field (radio waves) generated from an induction heating coil connected to an inverter circuit device. This magnetic field does not act only on the inner pot, but when the magnetic field leaks, items made of magnetic material placed near the main unit (pots, spoons, stands on which cookers are installed, etc.) will also heat up and generate heat. There is a problem that noise is generated on the radio of the above, and the leaked magnetic field acts on the inverter circuit device of the induction heating cooker itself and electric wires for wiring to generate noise, which causes malfunction. There is.
【０００３】この問題を解決するための発明として、例
えば特開平１−３０２６８号公報では図２に示すごと
く、本体１内壁を構成する保護枠２に収納された内鍋８
と、保護枠２底部にコイルベース４によって保持された
誘導加熱コイル３と、誘導加熱コイル３の下方に配した
インバーター回路装置７とを備えた誘導加熱式調理器に
おいて、誘導加熱コイル３の反対面のインバーター回路
装置７との間にフェライト５を放射状に複数個設け、さ
らに側面にはアルミ板製の防磁材９を設けているものが
ある。As an invention for solving this problem, for example, in Japanese Unexamined Patent Publication No. 1-30268, as shown in FIG. 2, an inner pot 8 housed in a protective frame 2 forming the inner wall of the main body 1 is shown.
In an induction heating cooker including an induction heating coil 3 held by a coil base 4 on the bottom of the protective frame 2 and an inverter circuit device 7 disposed below the induction heating coil 3, the induction heating coil 3 is opposite to the induction heating coil 3. There is one in which a plurality of ferrites 5 are radially provided between the surface and the inverter circuit device 7, and a magnetic shield 9 made of an aluminum plate is provided on the side surface.
【０００４】誘導加熱コイル３下方に生じる磁界は磁束
の通りやすいフェライト５を通過するので、フェライト
５はこれより下方への磁界を遮蔽（シールド）してい
る。ところがフェライト５は放射状に複数個配置されて
おり、全面を一体に覆っているわけではないので、フェ
ライト５の隙間から下方に磁界が漏れる。そこでフェラ
イト５の他にさらに防磁材９を設け、外に漏れる磁界を
遮蔽している。Since the magnetic field generated below the induction heating coil 3 passes through the ferrite 5 through which the magnetic flux easily passes, the ferrite 5 shields the magnetic field below it. However, since a plurality of ferrites 5 are radially arranged and do not cover the entire surface integrally, a magnetic field leaks downward from the gap between the ferrites 5. Therefore, in addition to the ferrite 5, a magnetic shield 9 is provided to shield the magnetic field leaking to the outside.
【０００５】また、特開昭５８−３２３８４号公報に示
すごとく、フェライト入りの樹脂で一体成形し、コイル
全面を覆って磁界の漏れをなくす発明や、特開昭５９−
３５３８６号公報、特開昭５９−１１４８７号公報、特
開昭５９−１１４８８号公報、特公平３−６３１９５号
公報の如く、磁界の遮蔽に関し、多くの発明がなされて
いる。Further, as disclosed in Japanese Patent Application Laid-Open No. 58-32384, an invention in which a ferrite-containing resin is integrally molded to cover the entire surface of a coil to eliminate magnetic field leakage, and Japanese Patent Application Laid-Open No. 59-59-
Many inventions have been made regarding the shielding of magnetic fields, such as Japanese Patent No. 35386, Japanese Patent Application Laid-Open No. 59-11487, Japanese Patent Application Laid-Open No. 59-11488, and Japanese Patent Publication No. 3-63195.
【０００６】[0006]
【発明が解決しようとする課題】前記従来の前者の発明
（特開昭５８−３２３８４号公報）では、フェライト５
の隙間から漏れた磁界は側面方向においては防磁材９で
遮蔽されるものの、下方向に関しては遮蔽するものがな
いので、漏れた磁界はその下方に配置されたインバータ
ー回路装置７の銅箔パターンや、配線のための電線等に
作用し、ノイズとなって誤動作を生じるという問題があ
った。この問題は前記従来例の特公平３−６３１９５号
公報にも述べられている通りである。In the former former invention (Japanese Patent Laid-Open No. 58-32384), the ferrite 5 is used.
Although the magnetic field leaking from the gap is shielded by the magnetic shield 9 in the lateral direction, there is no shield in the downward direction, so the leaked magnetic field is the copper foil pattern of the inverter circuit device 7 arranged below the magnetic field. However, there is a problem that it acts on an electric wire for wiring and causes noise to cause a malfunction. This problem is as described in Japanese Patent Publication No. 3-63195 of the prior art.
【０００７】防磁材は高周波磁界を遮蔽できて、誘導加
熱しにくい材料、例えばアルミ板を折り曲げて環状に成
形し、側面全周を覆うごとく配置されるが、環状となす
ために両端部を接合しなければならない。環状材料とは
特開昭５９−１１４８７号公報の導体リング、特開昭５
９−１１４８８号公報のショートリングにあたるが、接
合部は電気抵抗を有さないように接合されていないと、
スパークが生じることが知られている。The magnetic shield material is a material that can shield high-frequency magnetic fields and is hard to induce induction heating, for example, an aluminum plate is bent to be formed into an annular shape, and is arranged so as to cover the entire side surface. Must. The annular material is a conductor ring disclosed in Japanese Patent Laid-Open No. 59-11487, and Japanese Laid-Open Patent Publication No.
It corresponds to the short ring of 9-11488, but if the joint is not joined so as not to have electric resistance,
It is known that sparks occur.
【０００８】しかるにアルミ材料は表面が酸化して抵抗
値が増してしまうので、接合する前に接合部の表面を研
磨する必要があり、しかも接合にも非常に難しい技術を
要する。さらに、折り曲げて環状にする加工も必要で、
製造コストが増すという問題があった。However, since the surface of the aluminum material is oxidized to increase the resistance value, it is necessary to polish the surface of the joint before the joining, and the joining also requires a very difficult technique. In addition, it is necessary to bend it into a ring,
There was a problem that the manufacturing cost increased.
【０００９】一方、下方に配置されたインバーター回路
装置への磁界の漏れを防ぐにはフェライトの本数を増や
して隙間なく並べるか、フェライトを容器状に成形する
等、材料を多く使うとともに組立工数が多くなり、やは
り製造コストが増し、消費者に安価に提供できない問題
があった。On the other hand, in order to prevent the leakage of the magnetic field to the inverter circuit device arranged below, increase the number of ferrites and arrange them without gaps, or mold ferrites into a container shape, and use many materials, and the number of assembly steps is large. However, there is a problem that the manufacturing cost increases and the cost cannot be provided to consumers at low cost.
【００１０】本発明は誘導加熱コイルから生じる高周波
磁界を簡単な構成で効果的に遮蔽し、調理器のインバー
ター回路装置や調理器外部への磁界漏れを防ぐことを目
的とする。It is an object of the present invention to effectively shield the high frequency magnetic field generated from the induction heating coil with a simple structure and prevent the magnetic field from leaking to the inverter circuit device of the cooker or the outside of the cooker.
【００１１】[0011]
【課題を解決するための手段】本発明は上記課題を解決
するためになされたものであり、本体内壁を構成する保
護枠に収納された内鍋と、保護枠底部に保持された誘導
加熱コイルと、誘導加熱コイルの下方に配したインバー
ター回路装置とを備え、インバーター回路装置に接続さ
れた誘導加熱コイルから発生する高周波磁界により、内
鍋を誘導加熱し炊飯する誘導加熱式調理器において、前
記誘導加熱コイルとインバーター回路装置の間に上部開
口有底筒状で防磁材製のシールドケースを設け、このシ
ールドケースの筒部は誘導加熱コイルの外周を覆う形状
とし、誘導加熱コイルから下方のインバーター回路装置
への磁界を遮蔽し防磁するとともに、誘導加熱コイルか
ら外周方向への磁界を遮蔽するものとした。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an inner pot accommodated in a protective frame constituting the inner wall of the main body and an induction heating coil held at the bottom of the protective frame. And an inverter circuit device arranged below the induction heating coil, the induction heating type cooker that induction-heats and cooks the inner pot by the high-frequency magnetic field generated from the induction heating coil connected to the inverter circuit device, Between the induction heating coil and the inverter circuit device, a shield case made of a magnetic shielding material with a cylindrical shape having an upper opening with a bottom is provided, and the cylindrical portion of this shield case is configured to cover the outer circumference of the induction heating coil and the inverter below the induction heating coil. The magnetic field to the circuit device is shielded and shielded, and the magnetic field from the induction heating coil toward the outer circumference is shielded.
【００１２】[0012]
【作用】前記本発明の構成によれば、誘導加熱コイルが
高周波磁界を発生するが、誘導加熱コイルの上面は加熱
対象の内鍋が遮蔽し、外周は防磁材製のシールドケース
の筒部にて遮蔽し本体外周への磁界の漏れを防ぐ。ま
た、誘導加熱コイルの下面はシールドケースの底面にて
インバーター回路装置への磁界を遮蔽し防磁する。According to the structure of the present invention, the induction heating coil generates a high frequency magnetic field. The upper surface of the induction heating coil is shielded by the inner pot to be heated and the outer periphery is covered by the cylindrical portion of the shield case made of a magnetic shielding material. To prevent the magnetic field from leaking to the outer circumference of the body. The bottom surface of the induction heating coil is shielded from the magnetic field to the inverter circuit device by the bottom surface of the shield case.
【００１３】[0013]
【実施例】以下本発明の一実施例を図面を用いて詳細に
説明する。図１は本発明の一実施例を施した誘導加熱式
調理器の断面図である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a sectional view of an induction heating cooker to which an embodiment of the present invention is applied.
【００１４】その構成は図１において、本体１にはその
内壁をなす保護枠２が取り付けられており、保護枠２は
誘導加熱されない樹脂製で有底筒状に成型されている。
この保護枠２底面には誘導加熱コイル３がコイルベース
４によって保持されている。このコイルベース４裏面に
は棒上のフェライト５が複数個放射状に固定され、さら
にアルミ製で上部開口有底筒状に成型されたシールドケ
ース６が取り付けられている。このシールドケース６の
有底筒部が誘導加熱コイル３の側面及び底面を覆うよう
に配置されている。As shown in FIG. 1, a main body 1 is provided with a protective frame 2 which is an inner wall of the main body 1. The protective frame 2 is made of resin which is not induction-heated and is formed into a bottomed tubular shape.
An induction heating coil 3 is held by a coil base 4 on the bottom surface of the protective frame 2. A plurality of ferrites 5 on a bar are radially fixed to the back surface of the coil base 4, and a shield case 6 made of aluminum and formed in a cylindrical shape with an upper opening and a bottom is attached. The bottomed tubular portion of the shield case 6 is arranged so as to cover the side surface and the bottom surface of the induction heating coil 3.
【００１５】シールドケース６の下方の本体１内部には
インバーター回路装置７が取り付けられ、このインバー
ター回路装置７は誘導加熱コイル３と電気的に接続され
ている。保護枠２には着脱自在に内鍋８が挿入され保持
される。An inverter circuit device 7 is mounted inside the main body 1 below the shield case 6, and the inverter circuit device 7 is electrically connected to the induction heating coil 3. An inner pot 8 is detachably inserted into and held in the protective frame 2.
【００１６】以下上記構成からなる本実施例の作用を説
明する。The operation of this embodiment having the above structure will be described below.
【００１７】使用者は内鍋８に洗米した米と適量の水を
入れ、保護枠２内に収納する。次に炊飯スイッチ（図示
せず）を操作すると、炊飯動作が開始される。インバー
ター回路装置７が動作し、誘導加熱コイル３によって高
周波磁界が発生し、保護枠２内に収納された内鍋８に作
用し、誘導加熱し米と水が加熱され炊飯される。いわゆ
る「初めチョロチョロ中パッパ…」の火加減をインバー
ター回路装置７によって行い、炊き上がると炊飯を終了
してむらし工程に移行する。The user puts washed rice and an appropriate amount of water in the inner pot 8 and stores it in the protective frame 2. Next, when the rice cooking switch (not shown) is operated, the rice cooking operation is started. The inverter circuit device 7 operates, a high-frequency magnetic field is generated by the induction heating coil 3, acts on the inner pot 8 housed in the protection frame 2, and is induction-heated to heat rice and water to cook rice. The so-called "first choro choro medium papa ..." is adjusted by the inverter circuit device 7, and when it is cooked, the cooked rice is finished and the process shifts to the purging process.
【００１８】上記一連の炊飯工程の誘導加熱動作におい
て、誘導加熱コイル３によって上方に生じた磁界は内鍋
８に作用し、内鍋８の材料内にうず電流を発生させる。
このうず電流により、内鍋８の材料が有する電気抵抗に
よってジュール熱に変わり、いわゆる誘導加熱となる。In the induction heating operation of the series of rice cooking steps, the magnetic field generated upward by the induction heating coil 3 acts on the inner pot 8 to generate an eddy current in the material of the inner pot 8.
Due to this eddy current, the electric resistance of the material of the inner pot 8 changes into Joule heat, and so-called induction heating occurs.
【００１９】次に、下方に生じた磁界は磁束の通りやす
いフェライト５を通過する。フェライト５は誘導結合を
高めるとともに、下方に磁界が漏れないように作用して
いる。ところがフェライト５は放射状に複数個配置され
ているだけなので、フェライト５の間から下方に磁界が
漏れ、下方に配されているシールドケース６に至る。シ
ールドケース６に達した磁界は内鍋８に作用した磁界同
様に、シールドケース６内部にうず電流を発生させる
が、シールドケース６の材料であるアルミは電気抵抗が
小さいため、ほとんど発熱することがない。Next, the magnetic field generated below passes through the ferrite 5 where the magnetic flux easily passes. The ferrite 5 enhances the inductive coupling and acts so that the magnetic field does not leak downward. However, since only a plurality of ferrites 5 are radially arranged, the magnetic field leaks downward from between the ferrites 5 and reaches the shield case 6 arranged below. The magnetic field reaching the shield case 6 generates an eddy current inside the shield case 6 like the magnetic field acting on the inner pot 8, but aluminum, which is a material of the shield case 6, has a small electric resistance, and thus almost generates heat. Absent.
【００２０】また、シールドケース６によってシールド
されるので、磁界はシールドケース６の下に配されたイ
ンバーター回路装置７に至ることがなく、インバーター
回路装置７にノイズを発生させたり、誤動作させる恐れ
がない。Further, since the magnetic field is not shielded by the shield case 6, the magnetic field does not reach the inverter circuit device 7 arranged under the shield case 6, and the inverter circuit device 7 may generate noise or malfunction. Absent.
【００２１】また、誘導加熱コイル３から生じる磁界は
側面方向にも漏れるが、シールドケース６の側面筒部が
従来の帯状の防磁材と同様にシールド作用をするので、
本体１の側面方向へ磁界が漏れず、磁界・電波によりラ
ジオ等に雑音を与えることはない。Further, although the magnetic field generated from the induction heating coil 3 also leaks in the side surface direction, the side surface tubular portion of the shield case 6 acts as a shield like the conventional strip-shaped magnetic shield material.
The magnetic field does not leak in the side direction of the main body 1, and the magnetic field and radio waves do not give noise to the radio or the like.
【００２２】[0022]
【発明の効果】以上により本発明では、誘導加熱コイル
とインバーター回路装置の間に上部開口有底筒状で防磁
材製のシールドケースを設け、このシールドケースの筒
部は誘導加熱コイルの外周を覆う形状とし、誘導加熱コ
イルから下方のインバーター回路装置への磁界を遮蔽し
防磁するとともに、誘導加熱コイルから外周方向への磁
界を遮蔽するものとしたから、磁界はシールドケースの
下に配されたインバーター回路装置に至ることがなく、
インバーター回路装置の銅箔パターンや、配線のための
電線等に作用し、ノイズとなって誤動作を生じさせると
いう問題を防止でき、また、磁界が本体外へ漏れること
もなく、本体近傍に置かれた磁性材料からなる品物（鍋
・スプーン等や調理器を設置する台等）を加熱し発熱さ
せたり、付近のラジオ等に雑音を発生させるという問題
も防止でき、さらに、シールドケースは上部開口有底筒
状に一体成形できるので、接合面の研磨、難易度の高い
接合作業、環状成形作業等の作業工数増大や、フェライ
トの増量等材料費増大による多大のコストをかけること
なく安価に構成でき、消費者に磁界漏れによる弊害を防
止した誘導加熱式調理器を安価に提供出来る効果があ
る。As described above, according to the present invention, a shield case made of a magnetic shielding material having a cylindrical shape with an upper opening and a bottom is provided between the induction heating coil and the inverter circuit device. The magnetic field was placed under the shield case because it was designed to cover and shield the magnetic field from the induction heating coil to the lower inverter circuit device and shield it from the magnetic field in the outer peripheral direction from the induction heating coil. Without reaching the inverter circuit device,
It is possible to prevent the problem that it acts on the copper foil pattern of the inverter circuit device and the electric wires for wiring, etc., and it causes noise to cause malfunction, and the magnetic field does not leak to the outside of the main unit and it is placed near the main unit. It also prevents the problem of heating items made of magnetic materials (pots, spoons, stands on which cookers are installed, etc.) to generate heat, and generating noise in the nearby radio, etc. Furthermore, the shield case has an upper opening. Since it can be integrally molded into a bottom cylinder shape, it can be constructed inexpensively without increasing the man-hours such as polishing of the bonding surface, highly difficult bonding work, annular molding work, etc., and great cost due to increase in material cost such as ferrite increase. , The effect of being able to provide the consumer with an induction heating cooker that prevents the harmful effects of magnetic field leakage at a low cost.
【図１】本発明の一実施例を施した誘導加熱式調理器の
断面図である。FIG. 1 is a cross-sectional view of an induction heating cooker to which an embodiment of the present invention is applied.
【図２】従来の誘導加熱式調理器の断面図である。FIG. 2 is a sectional view of a conventional induction heating cooker.
３ 誘導加熱コイル ６ シールドケース ７ インバーター回路装置 3 Induction heating coil 6 Shield case 7 Inverter circuit device
Claims (1)
内鍋と、保護枠底部に保持された誘導加熱コイルと、誘
導加熱コイルの下方に配したインバーター回路装置とを
備え、インバーター回路装置に接続された誘導加熱コイ
ルから発生する高周波磁界により、内鍋を誘導加熱し炊
飯する誘導加熱式調理器において、前記誘導加熱コイル
（３）とインバーター回路装置（７）の間に上部開口有
底筒状で防磁材製のシールドケース（６）を設け、この
シールドケース（６）の筒部は誘導加熱コイル（３）の
外周を覆う形状とし、誘導加熱コイル（３）から下方の
インバーター回路装置（７）への磁界を遮蔽し防磁する
とともに、誘導加熱コイル（３）から外周方向への磁界
を遮蔽したことを特徴とする誘導加熱式調理器。1. An inverter circuit device comprising an inner pot housed in a protective frame that constitutes the inner wall of the main body, an induction heating coil held at the bottom of the protective frame, and an inverter circuit device disposed below the induction heating coil. In an induction heating cooker that induction-heats and cooks an inner pot by a high-frequency magnetic field generated from an induction heating coil connected to the above, an upper opening with a bottom is provided between the induction heating coil (3) and the inverter circuit device (7). A shield case (6) made of a magnetic shielding material is provided, and a cylindrical portion of the shield case (6) covers the outer periphery of the induction heating coil (3), and an inverter circuit device below the induction heating coil (3). An induction heating cooker characterized by shielding the magnetic field to (7) from the magnetic field and shielding the magnetic field from the induction heating coil (3) in the outer peripheral direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28104194A JPH08138847A (en) | 1994-11-16 | 1994-11-16 | Induction heating cooker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28104194A JPH08138847A (en) | 1994-11-16 | 1994-11-16 | Induction heating cooker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08138847A true JPH08138847A (en) | 1996-05-31 |
Family
ID=17633479
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28104194A Pending JPH08138847A (en) | 1994-11-16 | 1994-11-16 | Induction heating cooker |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08138847A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1771056A1 (en) * | 2005-09-28 | 2007-04-04 | Siemens Milltronics Process Instruments Inc. | A shielded compartment for mounting a high frequency radar component on a printed circuit board |
| JP2010240051A (en) * | 2009-04-02 | 2010-10-28 | Panasonic Corp | Rice cooker |
| JP2010240052A (en) * | 2009-04-02 | 2010-10-28 | Panasonic Corp | Rice cooker |
-
1994
- 1994-11-16 JP JP28104194A patent/JPH08138847A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1771056A1 (en) * | 2005-09-28 | 2007-04-04 | Siemens Milltronics Process Instruments Inc. | A shielded compartment for mounting a high frequency radar component on a printed circuit board |
| US7564399B2 (en) | 2005-09-28 | 2009-07-21 | Siemens Milltronics Process Instruments, Inc. | Shielded compartment for mounting a high frequency radar component on a printed circuit board |
| JP2010240051A (en) * | 2009-04-02 | 2010-10-28 | Panasonic Corp | Rice cooker |
| JP2010240052A (en) * | 2009-04-02 | 2010-10-28 | Panasonic Corp | Rice cooker |
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