JP2006141594A - Induction-heating rice cooker - Google Patents

Induction-heating rice cooker Download PDF

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JP2006141594A
JP2006141594A JP2004334116A JP2004334116A JP2006141594A JP 2006141594 A JP2006141594 A JP 2006141594A JP 2004334116 A JP2004334116 A JP 2004334116A JP 2004334116 A JP2004334116 A JP 2004334116A JP 2006141594 A JP2006141594 A JP 2006141594A
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magnetic
magnetic field
generating means
rice cooker
field generating
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Takeshi Kitaizumi
武 北泉
Motonari Hirota
泉生 弘田
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an induction-heating rice cooker for securing a stable rice cooking performance by preventing effect on magnetism-preventive magnetic substances caused by differences or the like of circuit systems of high-frequency inverters. <P>SOLUTION: Direct-current magnetic field generation means 5 are arranged near the magnetism-preventive magnetic substances 3 for applying a direct-current magnetic field during operation of the high-frequency inverter 4 so that an operating point of magnetic property of the magnetism-preventive magnetic substances 3 are changed. Thereby, the magnetism-preventive magnetic substances 3 have the same magnetic property even if the circuit system or case structure of the high-frequency inverter 4 is changed. As a result, the stable rice cooking performance is secured. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、家庭用および業務用として用いられる誘導加熱式炊飯器に関するものである。   The present invention relates to an induction heating rice cooker used for home use and business use.

従来から、誘導加熱式炊飯器はよく知られているところである（例えば、特許文献１参照）。   Conventionally, induction heating rice cookers are well known (see, for example, Patent Document 1).

図６に一般的な誘導加熱式炊飯器を示す。これは、鍋１と、鍋１と磁気的に結合するように鍋１に対向して配設される加熱コイル２と、鍋１と加熱コイル２との磁気結合を強めるために加熱コイル２の下方に配設される防磁磁性体３と、加熱コイル２に高周波電力を供給する高周波インバータ４とで構成されている。   FIG. 6 shows a general induction heating rice cooker. This is because the pot 1, the heating coil 2 disposed opposite to the pot 1 so as to be magnetically coupled to the pot 1, and the heating coil 2 to strengthen the magnetic coupling between the pot 1 and the heating coil 2. It is composed of a magnetic-shielding magnetic body 3 disposed below and a high-frequency inverter 4 that supplies high-frequency power to the heating coil 2.

このように構成された誘導加熱式炊飯器では、鍋１に高周波磁界を供給することで、鍋表層に渦電流を発生させ、鍋１自身を発熱させることで鍋１内の米および水に熱を加えて炊飯を行うものである。
特開平８−２６６４０１号公報 In the induction heating type rice cooker configured as described above, by supplying a high frequency magnetic field to the pan 1, an eddy current is generated on the surface of the pan and the pan 1 itself generates heat to heat the rice and water in the pan 1. To cook rice.
JP-A-8-266401

しかしながら、前記従来の構成では、御飯の炊きあがり具合、すなわち炊飯性能への防磁磁性体３の影響が大きく、加熱構成が少し変わっただけで炊飯性能が変わることが生じたり、あるいは高周波インバータ４の動作が変わっただけで炊飯性能が変わったりするという課題が生じていた。これは、防磁磁性体３の磁化特性を外部から変えられないためであり、筐体構成や回路動作に適した防磁磁性体を実験的に探すことで対応している。   However, in the conventional configuration, the effect of the magnetic-shielding magnetic body 3 on the cooking condition of the rice, that is, the rice cooking performance is large, and the rice cooking performance is changed only by a slight change in the heating configuration, or the operation of the high-frequency inverter 4 The problem that rice cooking performance changed just by changing was caused. This is because the magnetization characteristics of the magnetic-shielding magnetic body 3 cannot be changed from the outside, and this is dealt with by experimentally searching for a magnetic-shielding magnetic body suitable for the casing configuration and circuit operation.

本発明は、前記従来の課題を解決するために、筐体構成が変わるあるいは高周波インバータの動作が変わっても、同じ防磁磁性体を用いて安定して炊飯性能を得ることができる誘導加熱式炊飯器を提供することを目的としている。   In order to solve the above-described conventional problems, the present invention provides an induction heating rice cooker that can stably obtain rice cooking performance using the same magnetic-shielding magnetic material even if the housing configuration is changed or the operation of the high-frequency inverter is changed. The purpose is to provide a vessel.

前記従来の課題を解決するために、本発明の誘導加熱式炊飯器は、直流磁界を発生させる直流磁界発生手段を備え、高周波インバータの動作中に直流磁界発生手段により直流磁界を印可して防磁磁性体の透磁率を可変するようにしたものである。   In order to solve the above-mentioned conventional problems, the induction heating rice cooker of the present invention includes a DC magnetic field generating means for generating a DC magnetic field, and applies a DC magnetic field by the DC magnetic field generating means during operation of the high frequency inverter to prevent the magnetic field. The magnetic permeability of the magnetic material is made variable.

これにより、防磁磁性体の磁気抵抗を可変させ、高周波インバータの回路方式や筐体構成が変わっても防磁磁性体にこれまでと同様な磁気特性をもたせることができ、その結果、炊飯性能を安定して確保することができる。   As a result, the magnetic resistance of the magnetic-shielding magnetic body can be varied, and the magnetic-shielding magnetic body can have the same magnetic characteristics as before, even if the circuit system or housing configuration of the high-frequency inverter changes, resulting in stable rice cooking performance. Can be secured.

本発明の誘導加熱式炊飯器は、高周波インバータの回路方式や筐体構成が変わっても安定した炊飯性能を確保することができる。   The induction heating type rice cooker of the present invention can ensure stable rice cooking performance even if the circuit system or housing configuration of the high-frequency inverter changes.

第１の発明は、鍋と、前記鍋を誘導加熱する加熱コイルと、前記加熱コイル近傍に配置され前記鍋と前記加熱コイルの磁気結合を強める防磁磁性体と、前記加熱コイルに高周波電流を供給する高周波インバータと、直流磁界を発生させる直流磁界発生手段とを備え、前記高周波インバータの動作中に前記直流磁界発生手段により直流磁界を印可して防磁磁性体の透磁率を可変する誘導加熱式炊飯器とすることにより、防磁磁性体の磁気抵抗を可変させ、高周波インバータの回路方式や筐体構成が変わっても防磁磁性体にこれまでと同様な磁気特性をもたせることができ、その結果、炊飯性能を安定して確保することができる。   1st invention supplies a high frequency current to the pan, the heating coil which induction-heats the pan, the magnetic-shielding magnetic body which is arrange | positioned in the vicinity of the heating coil, and strengthens the magnetic coupling of the pan and the heating coil, and the heating coil Induction heating rice cooker comprising: a high-frequency inverter for generating a direct-current magnetic field; and a direct-current magnetic field generating means for generating a direct-current magnetic field, wherein the direct-current magnetic field is applied by the direct-current magnetic field generating means during operation of the high-frequency inverter. By changing the magnetic resistance of the magnetic-shielding magnetic body, the magnetic-shielding magnetic body can have the same magnetic characteristics as before, even if the circuit system and housing configuration of the high-frequency inverter are changed. The performance can be secured stably.

第２の発明は、特に、第１の発明において、直流磁界発生手段は、防磁磁性体近傍または加熱コイル近傍に配置することにより、少ない直流磁界で防磁磁性体への影響を与えることができるため、他の基幹部品への影響を少なくした状態で、防磁磁性体にこれまでと同様な磁気特性をもたせることができ、その結果、炊飯性能を安定して確保することができる。   In the second invention, in particular, in the first invention, the direct-current magnetic field generating means is arranged in the vicinity of the magnetic-shielding magnetic body or in the vicinity of the heating coil, so that the magnetic-shielding magnetic body can be affected with a small direct-current magnetic field. In a state where the influence on other basic parts is reduced, the magnetic-shielding magnetic body can have the same magnetic characteristics as before, and as a result, the rice cooking performance can be secured stably.

第３の発明は、特に、第１または第２の発明において、直流磁界発生手段は永久磁石により構成し、前記直流磁界発生手段は複数に配置された防磁磁性体にほぼ等しく直流磁界が掛かるように加熱コイルに対して円状に配置することにより、防磁磁性体に均等に直流磁界が掛かかり、直流磁界の防磁磁性体への影響を均一にできるため、複数の防磁磁性体にこれまでと同様な磁気特性をもたせることができ、その結果、安定した炊飯性能を確保することができる。   According to a third invention, in particular, in the first or second invention, the DC magnetic field generating means is constituted by a permanent magnet, and the DC magnetic field generating means applies a DC magnetic field substantially equally to a plurality of magnetically shielded magnetic bodies. Since the DC magnetic field is evenly applied to the magnetic-shielding magnetic body and the influence of the DC magnetic field on the magnetic-shielding magnetic body can be made uniform. Similar magnetic characteristics can be provided, and as a result, stable rice cooking performance can be ensured.

第４の発明は、特に、第１〜第３のいずれか１つの発明において、直流磁界発生手段は永久磁石により構成し、前記直流磁界発生手段は複数に配置された防磁磁性体のそれぞれの近傍に前記防磁磁性体からほぼ等距離で各防磁磁性体に対応して永久磁石を配置することにより、簡易の構成で直流磁界を安定して掛けることが可能となり、防磁磁性体にこれまでと同様な磁気特性をもたせることができ、その結果、安定した炊飯性能を確保することができる。   According to a fourth invention, in particular, in any one of the first to third inventions, the DC magnetic field generating means is constituted by a permanent magnet, and the DC magnetic field generating means is in the vicinity of each of a plurality of magnetically shielded magnetic bodies. By arranging a permanent magnet corresponding to each magnetic-shielding magnetic body at approximately the same distance from the magnetic-shielding magnetic body, it is possible to stably apply a DC magnetic field with a simple configuration, and to the magnetic-shielding magnetic body as before It is possible to have a magnetic property, and as a result, stable rice cooking performance can be ensured.

第５の発明は、特に、第３または第４の発明において、複数の永久磁石により構成される直流磁界発生手段は、極性をすべて同一とすることにより、防磁磁性体に均等に直流磁界が掛かかり、直流磁界の防磁磁性体への影響を均一にできるため、複数の防磁磁性体にこれまでと同様な磁気特性をもたせることができ、その結果、安定した炊飯性能を確保することができる。   In the fifth invention, in particular, in the third or fourth invention, the DC magnetic field generating means composed of a plurality of permanent magnets has the same polarity so that a DC magnetic field is equally applied to the magnetic-shielding magnetic body. Therefore, since the influence of the direct-current magnetic field on the magnetic-shielding magnetic body can be made uniform, it is possible to give the plurality of magnetic-shielding magnetic bodies the same magnetic characteristics as before, and as a result, stable rice cooking performance can be ensured.

第６の発明は、特に、第１または第２の発明において、直流磁界発生手段は、高周波インバータ内の直流電流が発生する配線を複数回巻き構成するコイル状の配線を用いることにより、簡易な構成で直流磁界を発生することが可能になるとともに配線のみで構成することができるため安価な構成で直流磁界を発生させることが可能となり、簡易で安価に防磁磁性体にこれまでと同様な磁気特性をもたせることができ、その結果、安定した炊飯性能を確保することができる。   In particular, according to a sixth aspect of the present invention, in the first or second aspect, the direct-current magnetic field generating means can be simplified by using a coil-shaped wiring in which a wiring for generating a direct current in the high-frequency inverter is wound a plurality of times. It is possible to generate a DC magnetic field with the configuration, and it is possible to generate a DC magnetic field with an inexpensive configuration because it can be configured with only wiring, and it is possible to generate a magnetic field similar to the conventional magnetism-proof magnetic body easily and inexpensively. A characteristic can be given and, as a result, the stable rice cooking performance can be ensured.

第７の発明は、特に、第６の発明において、コイル状の配線により構成される直流磁界発生手段は、防磁磁性体にほぼ等しく直流磁界が掛かるように加熱コイルと同周方向に円状に配置することにより、簡易の構成で直流磁界を安定して掛けることが可能となり、防磁磁性体にこれまでと同様な磁気特性をもたせることができ、その結果、安定した炊飯性能を確保することができる。   According to a seventh aspect of the invention, in particular, in the sixth aspect of the invention, the DC magnetic field generating means constituted by the coiled wiring is circular in the same circumferential direction as the heating coil so that a DC magnetic field is applied substantially equally to the magnetic-shielding magnetic body. By arranging it, it is possible to stably apply a DC magnetic field with a simple configuration, and it is possible to give the same magnetic characteristics to the magnetic shield as before, and as a result, it is possible to ensure stable rice cooking performance it can.

第８の発明は、特に、第６または第７の発明において、鍋を加熱する電力を制御する電力制御手段を備え、入力電力に応じて直流磁界発生手段の磁界発生量を変化させることにより、磁界変化に応じて防磁磁性体の動作点を変えることができるため、入力電力に応じて防磁磁性体は最適な動作点での動作が可能になり、防磁磁性体にこれまでと同様な磁気特性をもたせることができ、その結果、安定した炊飯性能を確保することができる。   The eighth invention, in particular, in the sixth or seventh invention, comprises power control means for controlling the power for heating the pan, and by changing the magnetic field generation amount of the DC magnetic field generation means according to the input power, Since the operating point of the magnetic-shielding magnetic body can be changed according to the change in the magnetic field, the magnetic-shielding magnetic body can operate at the optimum operating point according to the input power. As a result, stable rice cooking performance can be ensured.

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１）
図１〜図３は、本発明の実施の形態１における誘導加熱式炊飯器を示すものである。 (Embodiment 1)
1 to 3 show an induction heating type rice cooker according to Embodiment 1 of the present invention.

図１、図２に示すように、本実施の形態における誘導加熱式炊飯器は、鍋１と、鍋１に対向して配設し鍋１を誘導加熱する加熱コイル２と、加熱コイル２の近傍に配置され鍋１と加熱コイル２の磁気結合を強めるために加熱コイル２の裏面下方に配設される防磁磁性体３と、加熱コイル２に高周波電流を供給する高周波インバータ４と、直流磁界を発生させる直流磁界発生手段５とを備えている。そして、高周波インバータ４の動作中に直流磁界発生手段５により直流磁界を印可して防磁磁性体３の透磁率を可変するようにしたものである。   As shown in FIGS. 1 and 2, the induction heating rice cooker according to the present embodiment includes a pot 1, a heating coil 2 that is disposed opposite to the pot 1 and induction-heats the pot 1, and a heating coil 2. A magnetic-shielding magnetic body 3 disposed near the pan 1 and the heating coil 2 to strengthen the magnetic coupling between the pan 1 and the heating coil 2, a high-frequency inverter 4 for supplying a high-frequency current to the heating coil 2, and a DC magnetic field DC magnetic field generating means 5 for generating Then, a DC magnetic field is applied by the DC magnetic field generating means 5 during the operation of the high frequency inverter 4 so as to vary the magnetic permeability of the magnetic shield 3.

以上のように構成された誘導加熱式炊飯器について、以下その動作、作用を説明する。   About the induction heating type rice cooker comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

誘導加熱式炊飯器は、鍋１に高周波磁界を供給することで、鍋表層に渦電流を発生させ、鍋自身を発熱させることで鍋１内の米および水に熱を加え炊飯を行う。このため、鍋１は表層に渦電流が生じた時により発熱が大きくなるように表皮抵抗が大きい磁性ステンレスなどの磁性金属を含む金属材で構成される。また、鍋１への高周波磁界の供給は、加熱コイル１に高周波電流を流すことで発生する高周波磁界を利用している。そして、鍋１と加熱コイル２の磁気的な結合が強いほど効率よく高周波磁界を鍋１に集めることができるため、互いの結合を強めておくことが必要である。このため、加熱コイル２は鍋１と対向して配置され、更に加熱コイル２の裏面には防磁磁性体３が配設される。また、高周波インバータ４は、高周波インバータ４内の半導体スイッチを２０ｋ〜５０ｋＨｚ程度の周波数でｏｎ／ｏｆｆさせることで、加熱コイル２に高周波電流を発生させる。このため、誘導加熱式炊飯器は、高周波インバータ４内の半導体スイッチを用いての細かい制御が可能となり、炊飯工程を細かく設定することでおいしい御飯を炊くことができる。   The induction heating rice cooker cooks rice by adding heat to the rice and water in the pan 1 by generating an eddy current in the surface of the pan by supplying a high frequency magnetic field to the pan 1 and heating the pan itself. For this reason, the pan 1 is made of a metal material including a magnetic metal such as magnetic stainless steel having a large skin resistance so that heat generation increases when an eddy current is generated in the surface layer. The high frequency magnetic field is supplied to the pan 1 using a high frequency magnetic field generated by flowing a high frequency current through the heating coil 1. And since the high frequency magnetic field can be efficiently collected in the pan 1 as the magnetic coupling between the pan 1 and the heating coil 2 is strong, it is necessary to strengthen the mutual coupling. For this reason, the heating coil 2 is disposed to face the pan 1, and a magnetic-shielding magnetic body 3 is disposed on the back surface of the heating coil 2. Moreover, the high frequency inverter 4 generates a high frequency current in the heating coil 2 by turning on / off the semiconductor switch in the high frequency inverter 4 at a frequency of about 20 k to 50 kHz. For this reason, the induction heating type rice cooker can be finely controlled using the semiconductor switch in the high-frequency inverter 4, and can cook delicious rice by finely setting the rice cooking process.

一方、防磁磁性体３としては高周波磁界に対して損失の少ないフェライトが用いられることが多い。この際、防磁磁性体３は内部を通過する磁界に対して、図３のような特性を持つ。すなわち、磁界の状態によって磁界の通りやすさを示す透磁率が変化する特性を持つ。よって、誘導加熱を行う高周波磁界が掛かった状態では、防磁磁性体３は一定の範囲内で透磁率を変化させながら動作していることになる。この動作状態は、鍋１と加熱コイル２および高周波インバータ４の回路構成などで決まるため、一度全体構成が決まるとその構成に適した特性を持つ防磁磁性体３を選択する必要が生じることになる。   On the other hand, as the magnetic-shielding magnetic body 3, a ferrite having a small loss with respect to a high-frequency magnetic field is often used. At this time, the magnetic-shielding magnetic body 3 has characteristics as shown in FIG. 3 with respect to the magnetic field passing through the inside. That is, the magnetic permeability indicating the ease of passing the magnetic field changes depending on the state of the magnetic field. Therefore, in a state where a high frequency magnetic field for induction heating is applied, the magnetic-shielding magnetic body 3 operates while changing the magnetic permeability within a certain range. Since this operation state is determined by the circuit configuration of the pan 1, the heating coil 2, and the high-frequency inverter 4, etc., once the overall configuration is determined, it is necessary to select the magnetic-shielding magnetic body 3 having characteristics suitable for the configuration. .

特に、高周波インバータ４においては、高周波インバータ４が誘導加熱に用いられる高周波成分以外の直流成分を含む回路方式の場合には、防磁磁性体３は直流磁界が掛かった状態となるため、直流磁界でバイアスされた状態で高周波磁界による変化が生じることになる。そこで、直流磁界発生手段５により防磁磁性体３に直流磁界をかけることで、この直流バイアス分を変えることができるため、最良の動作範囲で防磁磁性体３の動作を行わせることができる。すなわち、防磁磁性体３の磁界の防磁効果を上げるために透磁率が高い場所を中心に高周波磁界が動作する様に直流磁界を掛けたり、あるいは飽和特性を改善するために原点付近を中心に高周波磁界が動作する様に直流磁界を掛けたり、あるいは炊飯性能が最適になるような動作点で高周波磁界が掛かるようにすることができる。   In particular, in the high-frequency inverter 4, when the high-frequency inverter 4 is a circuit system including a DC component other than the high-frequency component used for induction heating, the magnetic-shielding magnetic body 3 is in a state where a DC magnetic field is applied. A change due to a high-frequency magnetic field occurs in a biased state. Therefore, since the DC bias can be changed by applying a DC magnetic field to the magnetic shield 3 by the DC magnetic field generating means 5, the magnetic shield 3 can be operated in the best operating range. That is, a DC magnetic field is applied so that a high-frequency magnetic field operates around a place where the magnetic permeability is high in order to increase the magnetic-shielding effect of the magnetic-shielding magnetic body 3, or a high-frequency around the origin in order to improve saturation characteristics. A DC magnetic field can be applied so that the magnetic field operates, or a high frequency magnetic field can be applied at an operating point at which the rice cooking performance is optimized.

また、直流磁界発生手段５は防磁磁性体３に少ない直流磁界で影響を与えることができるように、加熱コイル２の近傍または防磁磁性体５の近傍に配置することが望ましく、また直流磁界発生手段５としては永久磁石を用いた方が配線などが必要なく簡易な構成で実現することができる。   Further, the DC magnetic field generating means 5 is preferably arranged in the vicinity of the heating coil 2 or in the vicinity of the magnetic-shielding magnetic body 5 so that the magnetic-shielding magnetic body 3 can be influenced by a small DC magnetic field. 5 can be realized with a simple configuration by using a permanent magnet without the need for wiring.

更に、直流磁界発生手段５に永久磁石を用いる場合においては、図２に示すように各防磁磁性体３の近傍毎に対象に配置することで各防磁磁性体３の動作状態を均一にすることができるとともに、永久磁石の極性をすべて同一とすることで各防磁磁性体３の動作点を揃えることができる。   Further, in the case where a permanent magnet is used for the DC magnetic field generating means 5, as shown in FIG. 2, the operation state of each magnetic-shielding magnetic body 3 is made uniform by arranging it in the vicinity of each magnetic-shielding magnetic body 3. In addition, by making the polarities of the permanent magnets the same, it is possible to align the operating points of the respective magnetic-shielding magnetic bodies 3.

以上のように、本実施の形態においては、直流磁界発生手段５により高周波インバータ４の動作中に直流磁界を印可することにより、防磁磁性体３の磁気特性における動作点を変えることができるため、高周波インバータ４の回路方式や筐体構成が変わっても同じ防磁磁性体３を用いて炊飯性能を安定して確保することができる。   As described above, in the present embodiment, by applying a DC magnetic field during the operation of the high-frequency inverter 4 by the DC magnetic field generating means 5, the operating point in the magnetic characteristics of the magnetic shield 3 can be changed. Even if the circuit system and the housing configuration of the high-frequency inverter 4 are changed, the rice cooking performance can be stably secured by using the same magnetic-shielding magnetic body 3.

（実施の形態２）
図４、図５は、本発明の実施の形態２における誘導加熱式炊飯器を示すものである。実施の形態１と同一要素については同一符号を付して説明を省略する。 (Embodiment 2)
4 and 5 show an induction heating rice cooker according to Embodiment 2 of the present invention. The same elements as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

図に示すように、本実施の形態における誘導加熱式炊飯器は、高周波インバータ４内で直流電流が発生する配線を複数回巻き構成するコイル状の配線６を用いて実施の形態１における直流磁界発生手段５を構成している。   As shown in the figure, the induction heating type rice cooker in the present embodiment uses a coil-shaped wiring 6 configured to wind a wiring in which a direct current is generated in the high-frequency inverter 4 a plurality of times. The generating means 5 is configured.

以上のように構成された誘導加熱式炊飯器について、以下その動作、作用を説明する。   About the induction heating type rice cooker comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

高周波インバータ４は、商用電源を全波整流し直流電源化した後、半導体スイッチをｏｎ／ｏｆｆすることで半導体スイッチの接続された加熱コイル２に高周波電流を供給する構成をとる。そこで、全波整流した後の配線を複数回巻きにしてコイル状の配線６を構成することで直流磁界を発生させることができる。このコイル状の配線６を、図５に示す様に、加熱コイル２および防磁磁性体３の近傍に配置することで、防磁磁性体３の磁界変化の動作範囲を最適にすることができる。この際、コイル状の配線６の巻き数を変えることで直流磁界の量を調整することができる。   The high-frequency inverter 4 is configured to supply a high-frequency current to the heating coil 2 connected to the semiconductor switch by turning the semiconductor switch on / off after full-wave rectification of the commercial power supply into a DC power supply. Therefore, a DC magnetic field can be generated by configuring the coiled wiring 6 by winding the wiring after full-wave rectification a plurality of times. As shown in FIG. 5, the coil-shaped wiring 6 is disposed in the vicinity of the heating coil 2 and the magnetic-shielding magnetic body 3, so that the operating range of the magnetic-field change of the magnetic-shielding magnetic body 3 can be optimized. At this time, the amount of the DC magnetic field can be adjusted by changing the number of turns of the coiled wiring 6.

また、コイル状の配線６は、図５に示すように加熱コイル２と同周方向に円状に配置することで、直流磁界を防磁磁性体３にほぼ等しく掛けることができる。   In addition, the coil-like wiring 6 can be applied substantially equally to the magnetic-shielding magnetic body 3 by arranging the wiring 6 in a circle in the same circumferential direction as the heating coil 2 as shown in FIG.

更に、コイル状の配線６を高周波インバータ４の主回路上の配線から取ることで、入力電力に応じた直流磁界を得ることができるようになるため、入力電力に応じて最適な動作点で動作させることができる。   Furthermore, by taking the coiled wiring 6 from the wiring on the main circuit of the high-frequency inverter 4, it becomes possible to obtain a DC magnetic field according to the input power, so that it operates at an optimum operating point according to the input power. Can be made.

なお、図示していないが、鍋１を加熱する電力を制御する電力制御手段を備え、入力電力に応じてコイル状の配線６（直流磁界発生手段５）の磁界発生量を変化させれば、磁界変化に応じて防磁磁性体３の動作点を変えることができるため、入力電力に応じて防磁磁性体３は最適な動作点での動作が可能になり、防磁磁性体３にこれまでと同様な磁気特性をもたせることができ、その結果、安定した炊飯性能を確保することができる。   In addition, although not shown in figure, if the electric power control means which controls the electric power which heats the pan 1 is provided and the magnetic field generation amount of the coil-shaped wiring 6 (DC magnetic field generation means 5) is changed according to input electric power, Since the operating point of the magnetic-shielding magnetic body 3 can be changed according to the change of the magnetic field, the magnetic-shielding magnetic body 3 can operate at the optimum operating point according to the input power. It is possible to have a magnetic property, and as a result, stable rice cooking performance can be ensured.

以上のように本実施の形態においては、直流磁界発生手段５として高周波インバータ４内の直流電流が発生する配線を複数回巻き構成するコイル状の配線６を用いることにより、簡易な構成で直流磁界を発生することが可能になるとともに配線のみで構成することができ、安定した炊飯性能を確保することができる。   As described above, in the present embodiment, the DC magnetic field generating means 5 is a DC magnetic field with a simple configuration by using the coiled wiring 6 configured to wind a wiring for generating a DC current in the high frequency inverter 4 a plurality of times. Can be formed with only wiring, and stable rice cooking performance can be ensured.

以上のように、本発明にかかる誘導加熱式炊飯器は、高周波インバータの回路方式や筐体構成が変わっても安定した炊飯性能を確保することができるので、家庭用および業務用の誘導加熱式炊飯器として最適なものである。   As described above, the induction heating rice cooker according to the present invention can ensure stable rice cooking performance even if the circuit method and the case configuration of the high-frequency inverter are changed. It is most suitable as a rice cooker.

本発明の実施の形態１における誘導加熱式炊飯器の要部構成を示す断面図Sectional drawing which shows the principal part structure of the induction heating type rice cooker in Embodiment 1 of this invention. 同誘導加熱式炊飯器の要部構成を示す下面図Bottom view showing the main configuration of the induction heating rice cooker 同誘導加熱式炊飯器における防磁磁性体の特性図Characteristic diagram of magnetic-shielding magnetic material in the induction heating rice cooker 本発明の実施の形態２における誘導加熱式炊飯器の要部構成を示す断面図Sectional drawing which shows the principal part structure of the induction heating type rice cooker in Embodiment 2 of this invention. 同誘導加熱式炊飯器の要部構成を示す下面図Bottom view showing the main configuration of the induction heating rice cooker 従来の誘導加熱式炊飯器の構成を示す断面図Sectional drawing which shows the structure of the conventional induction heating type rice cooker

符号の説明Explanation of symbols

１ 鍋
２ 加熱コイル
３ 防磁磁性体
４ 高周波インバータ
５ 直流磁場発生手段
６ コイル状の配線 DESCRIPTION OF SYMBOLS 1 Pan 2 Heating coil 3 Magnetic-shielding magnetic body 4 High frequency inverter 5 DC magnetic field generating means 6 Coiled wiring

Claims (8)

鍋と、前記鍋を誘導加熱する加熱コイルと、前記加熱コイル近傍に配置され前記鍋と前記加熱コイルの磁気結合を強める防磁磁性体と、前記加熱コイルに高周波電流を供給する高周波インバータと、直流磁界を発生させる直流磁界発生手段とを備え、前記高周波インバータの動作中に前記直流磁界発生手段により直流磁界を印可して防磁磁性体の透磁率を可変する誘導加熱式炊飯器。 A pan, a heating coil for inductively heating the pan, a magnetic-shielding magnetic material arranged near the heating coil to strengthen the magnetic coupling between the pan and the heating coil, a high-frequency inverter for supplying a high-frequency current to the heating coil, and a direct current An induction heating rice cooker comprising: a direct-current magnetic field generating means for generating a magnetic field, wherein the direct-current magnetic field is applied by the direct-current magnetic field generating means during operation of the high-frequency inverter to vary the magnetic permeability of the magnetic-shielding magnetic body. 直流磁界発生手段は、防磁磁性体近傍または加熱コイル近傍に配置する請求項１に記載の誘導加熱式炊飯器。 The induction heating type rice cooker according to claim 1, wherein the direct-current magnetic field generating means is disposed in the vicinity of the magnetic-shielding magnetic body or in the vicinity of the heating coil. 直流磁界発生手段は永久磁石により構成し、前記直流磁界発生手段は複数に配置された防磁磁性体にほぼ等しく直流磁界が掛かるように加熱コイルに対して円状に配置する請求項１または２に記載の誘導加熱式炊飯器。 3. The direct current magnetic field generating means is constituted by a permanent magnet, and the direct current magnetic field generating means is arranged in a circle with respect to the heating coil so that a direct current magnetic field is applied substantially equally to a plurality of magnetically shielded magnetic bodies. The induction heating rice cooker described. 直流磁界発生手段は永久磁石により構成し、前記直流磁界発生手段は複数に配置された防磁磁性体のそれぞれの近傍に前記防磁磁性体からほぼ等距離で各防磁磁性体に対応して永久磁石を配置する請求項１〜３のいずれか１項に記載の誘導加熱式炊飯器。 The direct current magnetic field generating means is constituted by a permanent magnet, and the direct current magnetic field generating means is provided with a permanent magnet corresponding to each magnetic shield magnetic body at an approximately equal distance from the magnetic shield magnetic body in the vicinity of each of the plurality of magnetic shield magnetic bodies. The induction heating type rice cooker of any one of Claims 1-3 arrange | positioned. 複数の永久磁石により構成される直流磁界発生手段は、極性をすべて同一とする請求項３または４に記載の誘導加熱式炊飯器。 The induction heating type rice cooker according to claim 3 or 4, wherein the DC magnetic field generating means constituted by a plurality of permanent magnets has the same polarity. 直流磁界発生手段は、高周波インバータ内の直流電流が発生する配線を複数回巻き構成するコイル状の配線を用いる請求項１または２に記載の誘導加熱式炊飯器。 The induction heating type rice cooker according to claim 1 or 2, wherein the DC magnetic field generating means uses a coil-shaped wiring configured to wind a wiring for generating a DC current in the high-frequency inverter a plurality of times. コイル状の配線により構成される直流磁界発生手段は、防磁磁性体にほぼ等しく直流磁界が掛かるように加熱コイルと同周方向に円状に配置する請求項６に記載の誘導加熱式炊飯器。 7. The induction heating type rice cooker according to claim 6, wherein the DC magnetic field generating means constituted by the coiled wiring is arranged in a circle in the same circumferential direction as the heating coil so that the DC magnetic field is applied almost equally to the magnetic-shielding magnetic body. 鍋を加熱する電力を制御する電力制御手段を備え、入力電力に応じて直流磁界発生手段の磁界発生量を変化させる請求項６または７に記載の誘導加熱式炊飯器。 The induction heating rice cooker according to claim 6 or 7, further comprising power control means for controlling power for heating the pan, wherein the amount of magnetic field generated by the DC magnetic field generating means is changed according to input power.
JP2004334116A 2004-11-18 2004-11-18 Induction-heating rice cooker Pending JP2006141594A (en)

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