JP2004261278A - Induction heating cooking pot, method for manufacturing induction heating cooking pot, and rice cooker - Google Patents

Induction heating cooking pot, method for manufacturing induction heating cooking pot, and rice cooker Download PDF

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JP2004261278A
JP2004261278A JP2003052900A JP2003052900A JP2004261278A JP 2004261278 A JP2004261278 A JP 2004261278A JP 2003052900 A JP2003052900 A JP 2003052900A JP 2003052900 A JP2003052900 A JP 2003052900A JP 2004261278 A JP2004261278 A JP 2004261278A
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pot
induction heating
heating cooking
recess
concave portion
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JP4395310B2 (en
Inventor
Eiji Kogure
栄治 小暮
Koji Hishiyama
弘司 菱山
Sadao Kanetani
定男 金谷
Masao Shimoda
政雄 霜田
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Mitsubishi Electric Home Appliance Co Ltd
Mitsubishi Electric Corp
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Mitsubishi Electric Home Appliance Co Ltd
Mitsubishi Electric Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an induction heating cooking pot that improves a rice cooking performance by increasing the heating power during cooking of rice. <P>SOLUTION: The induction heating cooking pot 3 radiates almost of heat from the inside having a greater surface area when an outside ferromagnetic metal layer 3a heats by electromagnetic induction heating because the surface area of the inside is greater than the outside surface area. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、複数の金属層で構成された誘導加熱調理用鍋、この誘導加熱調理用鍋の製造方法、およびこの誘導加熱調理用鍋を用いた炊飯器に関するものである。
【０００２】
【従来の技術】
従来の誘導加熱調理用鍋は、内側のアルミニウム層と外側の磁性体金属層との２層で構成され、磁性体金属層の外面に凹凸加工が施されている（例えば、特許文献１参照）。
【０００３】
【特許文献１】
特開平９−１２９３６１号公報（第３，４頁、図２）
【０００４】
なお、誘導加熱調理用鍋とは異なるが、一般的なガスレンジ用鍋の参考例として、例えば、特開２００１−２３８７９１号公報に記載のものがある。
【０００５】
【発明が解決しようとする課題】
しかしながら、従来の誘導加熱調理用鍋は、鍋の外面に凹凸があるため、磁性体金属層の表面積が大きくなり、電磁誘導によって加熱された磁性体金属層の表面から熱が逃げ易くなる。その結果、鍋の加熱効率が低下してしまい問題であった。
【０００６】
本発明は、このような問題を解決し、加熱効率の高い誘導加熱調理用鍋、誘導加熱調理用鍋の製造方法および炊飯器を提供することを目的とする。
【０００７】
【課題を解決するための手段】
本発明の誘導加熱調理用鍋は、外側の磁性体金属層と内側の熱良導性金属層との少なくとも２層の金属層で構成された誘導加熱調理用鍋において、鍋本体の外面の表面積より内面の表面積を大きくしたものである。
【０００８】
また、本発明の誘導加熱調理用鍋の製造方法は、外側の磁性体金属層と内側の熱良導性金属層との少なくとも２層の金属層で構成された円形多層金属板に対して、その内面に多数の凹部を形成し、その後に鍋形状にプレス成形したものである。
【０００９】
さらに、本発明の炊飯器は、炊飯器本体と、炊飯器本体の上部開口部を覆う蓋体と、炊飯器本体内に着脱可能に収容される誘導加熱調理用鍋と、誘導加熱調理用鍋を加熱する誘導加熱コイルとを備え、誘導加熱調理用鍋は、外側の磁性体金属層と内側の熱良導性金属層との少なくとも２層の金属層で構成され、鍋本体の外面より内面の表面積を大きくしたものである。
【００１０】
【発明の実施の形態】
以下、本発明に係る誘導加熱調理用鍋、誘導加熱調理用鍋の製造方法および炊飯器の好適な実施の形態について添付図面を参照して説明する。
実施の形態１．
図１は、実施の形態１に係る炊飯器の構成を示す断面図である。図１において、１は上部が開口した炊飯器本体、２は炊飯器本体１の後方上部に設けられたヒンジ部１ａを介して炊飯器本体１の上部開口部を開閉自在に覆うように取付けられた蓋体、３は炊飯器本体１内に収容される誘導加熱調理用鍋、４は誘導加熱調理用鍋３を電磁誘導加熱する誘導加熱コイル、５は上ケース６と下ケース７とコイル台８からなる炊飯器本体１の本体ケースである。ここで、誘導加熱コイル４は、２重の環状に配置された内コイル４ａと外コイル４ｂとを備えている。
【００１１】
そして、上ケース６の前面側上部には、炊飯スイッチや予約スイッチ等の操作パネル９が設けられ、炊飯器本体１内の後方側には、上ケース６から下ケース７に亘って電源コードリール１０が設けられている。また、本体ケース５のコイル台８のほぼ中心部には、誘導加熱調理用鍋３の底部に接触して誘導加熱調理用鍋３の温度を検知する温度センサ１１が設けられ、炊飯器本体１の内部には、炊飯器の動作を制御する制御部１２が設けられている。
【００１２】
次に、図２〜４を用いて誘導加熱調理用鍋３の構造を詳細に説明する。図２は誘導加熱調理用鍋３の内部側面形状を示す断面図である。また、図３は誘導加熱調理用鍋３の内部底面形状を示す平面図である。さらに、図４は誘導加熱調理用鍋３の断面構造を示す部分拡大図である。図２〜図４に示すように、誘導加熱調理用鍋３は、外側の磁性体金属層３ａと、内側の熱良導性金属層３ｂとの２層の金属層で構成され、内表面にはご飯がこびり付かないようにフッ素樹脂コーティング層３ｃが形成されている。磁性体金属層３ａには、フェライト系ステンレスや鋼板等が用いられ、熱良導性金属層３ｂには、アルミニウムまたはアルミニウム合金が用いられている。
【００１３】
なお、磁性体金属層３ａの外表面にも、フッ素樹脂コーティング層やシリコーン系の非粘着性のコーティング層を形成してもよい。また、磁性体金属層３ａには、誘導加熱可能な金属であれば、いかなる金属を用いてもよい。さらに、熱良導性金属層３ｂには、誘導加熱された磁性体金属層３ａの熱を鍋内部に伝達できる金属であれば、いかなる金属を用いてもよい。
【００１４】
誘導加熱調理用鍋３の内面には、内コイル４ａの対向部から外コイル４ｂの対向部（即ち、誘導加熱コイル４に対向する部位）にかけて、鍋底の中心を円心とした同心円上に、放射状に多数の球面形状の凹部１３ａが形成されている。そして、各凹部１３ａの周縁部分が凸部１３ｂを構成し、誘導加熱調理用鍋３の内面が凹凸になっている。一方、誘導加熱調理用鍋３の外面には、何ら凹凸加工は施されておらず、滑らかな平坦面となっている。
【００１５】
このため、誘導加熱調理用鍋３は、外面の表面積よりも内面の表面積の方が大きくなる。その結果、誘導加熱コイル４の駆動によって磁力線が発生し、磁性体金属層３ａが電磁誘導加熱で発熱した場合、この熱の多くは、表面積の大きな誘導加熱調理用鍋３の内面から放射される。よって、炊飯時の火力が強力になり、炊飯性能が向上する。また、誘導加熱調理用鍋３の内面が凹凸であるため、鍋内の水との接触面積が増加して、熱効率の高い加熱が可能となる。さらに、誘導加熱調理用鍋３の内面が凹凸であるため、米粒との接触及び当たりが増加し、軽い力で素早く米研ぎを行うことができる。
【００１６】
また、誘導加熱調理用鍋３の内面に凹部１３ａを設けることにより、鍋内に対流を効果的に発生させることが可能となる。即ち、図５に示すように、電磁誘導加熱によって磁性体金属層３ａが発熱した場合、この熱は熱良導性金属層３ｂを通過して、誘導加熱調理用鍋３の内面から放射される。この際、凹部１３ａ底面と凸部１３ｂとでは、熱を通過させる距離が大きく異なる。即ち、磁性体金属層３ａと熱良導性金属層３ｂとの接合面から凹部１３ａ底面までの距離Ｌ１に比べて、磁性体金属層３ａと熱良導性金属層３ｂとの接合面から凸部１３ｂまでの距離Ｌ２の方が長い。
【００１７】
その結果、凸部１３ｂに比べて凹部１３ａ底面の方が、熱良導性金属層３ｂの通過による熱損失が少なくなり、凸部１３ｂの表面温度ｔ２に比べて、凹部１３ａ底面の表面温度ｔ１の方が高くなる。そして、凹部１３ａと凸部１３ｂとの表面温度の差（ｔ１−ｔ２）によって鍋内に対流が発生し、米粒を鍋内で適度に循環させることができる。その結果、炊きムラの少ないふっくらしたご飯を炊き上げることが可能となる。
【００１８】
図６に示すように、誘導加熱調理用鍋３は、凹部１３ａの外径が米粒の長辺より長くなるように構成されている。このため、以下に挙げる効果が得られる。第１に、凹部１３ａ内に米粒が入り込み易くなり、凹部１３ａ内で米粒を十分に加熱させることができる。第２に、凹部１３ａ内に入り込んだ米粒と凹部１３ａとの間に隙間ができるので、炊飯時の水の対流がこの隙間に入り込み、米粒を押し上げるように作用する。その結果、凹部１３ａ内の米粒は、凹部１３ａ内から容易に離脱できるようになり、凹部１３ａ内での米粒の目詰まりが抑制される。よって、十分な放熱面積が確保され、誘導加熱調理用鍋３の熱効率が向上する。
【００１９】
第３に、凹部１３ａに入り込んだ米粒によって、積み重なった米粒の整列が乱れ、米を研ぐときに米粒同士の摩擦が良くなる。このため、米を研ぐときに米粒に掛かる力が分散され、米粒の割れを効果的に防止できる。また、米粒同士の摩擦が良好なために、一回の米研ぎで多くの米粒に力が波及するので、米を研ぐ時間を短縮させることができる。
【００２０】
さらに、誘導加熱調理用鍋３は、凹部１３ａの深さが米粒の短辺より浅くなるように構成されている。このため、以下に挙げる効果が得られる。第１に、凹部１３ａ内に入り込んだ米粒の上端部は、凹部１３ａからはみ出すので、炊飯時の水の対流が米粒の上端部に直接当たる。その結果、米粒は凹部１３ａ内から容易に離脱することができ、凹部１３ａ内での米粒の目詰まりが抑制される。よって、十分な放熱面積が確保され、誘導加熱調理用鍋３の熱効率が向上する。第２に、米を研ぐ際に、凹部１３ａからはみ出した米粒の上端部に直接力が加わるので、米粒は凹部１３ａ内に留まることなく、鍋内を効率的に移動する。このため、米粒の鍋内での循環が加速され、より均一に米を研ぐことが可能となる。
【００２１】
以上説明した各効果は、少なくとも誘導加熱コイル４に対向する部位に凹部１３ａが形成されていれば、確実に発揮される。しかし、凹部１３ａの形成位置は、誘導加熱コイル４に対向する部位のみに限定されるものではなく、図７に示すように、誘導加熱調理用鍋３の側面上部まで、凹部１３ａを形成してもよい。また、内コイル４ａに対向する部位には凹部１３ａを形成し、且つ外コイル４ｂに対向する部位には凹部１３ａを形成しないという構成としてもよい。さらに、誘導加熱コイル４に対向する部位において、凹部１３ａを形成する部分と凹部１３ａを形成しない部分とに分ける構成としてもよい。このような構成とすることにより、炊飯時の鍋内の対流に変化を起こさせることができ、米粒の鍋内での循環が促進され、加熱効率が向上する。
【００２２】
また、凹部１３ａの形状は、球面形状或いは楕円球面形状に限定されることなく、例えば、図８（ａ）〜（ｃ）に示すような四角錘形状や、図９（ａ）〜（ｄ）に示すような長径形状（サイド三角錘形状）であってもよい。さらに、異なる形状の組み合わせであってもよい。
【００２３】
図１０は、実施の形態１の変形例に係る誘導加熱調理用鍋３の内部側面形状を示す図である。図１０に示すように、誘導加熱調理用鍋３の内部側面には、凹部１３ａが形成されずに略平坦な水位目盛り表示エリア１４が設けられている。水位目盛り表示エリア１４には、鍋内に満たされる水の水位を示す「水位目盛り」が印刷されている。略平坦な水位目盛り表示エリア１４に「水位目盛り」を印刷することにより、印刷のかすれを確実に防止することができる。なお、水位目盛り表示エリア１４は、単一でもよく、また等間隔に複数個設けてもよい。
【００２４】
図１１は、実施の形態１の他の変形例に係る誘導加熱調理用鍋３の内部側面形状を示す図である。図１１に示すように、誘導加熱調理用鍋３の側面に形成された凹部１３ａは、長辺を上下に延ばした楕円球面形状を有している。このため、炊飯後に杓文字でご飯を装う際、誘導加熱調理用鍋３の側面に沿って上から下に杓文字の先端を移動させることにより、凹部１３ａ内の飯粒は傾斜の緩やかな楕円の長辺方向に移動して凹部１３ａ内から離脱する。その結果、凹部１３ａ内での飯粒のこびり付きが解消され、誘導加熱調理用鍋３の洗浄が容易になる。
【００２５】
図１２は、実施の形態１の他の変形例に係る誘導加熱調理用鍋３の内部底面形状を示す図である。図１２に示すように、誘導加熱調理用鍋３の底面に形成された凹部１３ａは、長辺を放射状に延ばした楕円球面形状を有している。このため、炊飯後に杓文字でご飯を装う際、誘導加熱調理用鍋３の底面に沿って中心から周縁に杓文字の先端を移動させることにより、凹部１３ａ内の飯粒は傾斜の緩やかな楕円の長辺方向に移動して凹部１３ａ内から離脱する。その結果、凹部１３ａ内での飯粒のこびり付きが解消され、誘導加熱調理用鍋３の洗浄が容易になる。
【００２６】
図１３，１４は、実施の形態１の他の変形例を示す図である。図１３に示すように、誘導加熱調理用鍋３の底面には、凹部１３ａが形成されずに略平坦な温度測定エリア１５が設けられている。そして、図１４に示すように、温度測定エリア１５に対向する下面には、温度センサ１１が配置されている。このため、誘導加熱調理用鍋３内部の熱は略平坦な温度測定エリア１５を通して極めて少ないロスで温度センサ１１に到達するので、誘導加熱調理用鍋３内部の正確な温度を温度センサ１１で検出することが可能となる。
【００２７】
実施の形態２．
次に、実施の形態２に係る誘導加熱調理用鍋の製造方法を説明する。なお、実施の形態２の製造方法によって、実施の形態１で詳細に説明した誘導加熱調理用鍋３が製造される。従って、実施の形態１と同一又は同等な構成部分については同一符号を付し、その説明は省略する。
【００２８】
図１５は、誘導加熱調理用鍋３の材料となる円形多層金属板１６を示す図である。円形多層金属板１６は、図１６（ａ）に示すように、複数の金属層（磁性体金属層３ａと熱良導性金属層３ｂ）で構成されている。そして、図１５、図１６（ｂ）に示すように、円形多層金属板１６の熱良導性金属層３ｂ側の中央部分に、多数の球面形状の凹部１３ａを形成する。ここで、上下に設けられた矩形状の一対の水位目盛り表示エリア１４には、凹部１３ａは形成しないものとする。その後、熱良導性金属層３ｂ側を内側にして鍋形状にプレス成形し、更に、図１６（ｃ）に示すように、熱良導性金属層３ｂの上面にフッ素樹脂コーティング層３ｃを形成することにより、図２、図３に示した誘導加熱調理用鍋３が完成する。
【００２９】
本実施の形態の製造方法では、円形多層金属板１６をプレス成形する前に、凹部１３ａを形成することによって、加工のし難い鍋の内面に対しても容易に凹部１３ａを形成することができる。また、プレス成形後にフッ素樹脂コーティング層３ｃを形成することにより、フッ素樹脂コーティング層３ｃがプレス成形時の押圧力によって傷つくことを防止することができる。
【００３０】
円形多層金属板１６に形成する凹部１３ａは、プレス成形により鍋の側面になる部分と、プレス成形により鍋のコーナー（鍋の側面と底面との境界部分）になる部分と、プレス成形により鍋の底面になる部分とで、形状を変えてもよい。即ち、図１７（ａ）に示すように、鍋の側面になる部分は、上下方向に引っ張られると共に、左右方向に圧縮され、凹部１３ａの開口が上下に延びる。従って、凹部１３ａの開口を予め左右方向に長く且つ上下方向に短い楕円形に形成することにより、プレス成形により凹部１３ａの開口は、真円形状となる。
【００３１】
また、図１７（ｂ）に示すように、鍋のコーナーになる部分は、鍋の側面になる部分より更に上下方向に引っ張られ、凹部１３ａの開口が上下に延びる。従って、凹部１３ａの開口を予め上下方向に短い楕円形（鍋の側面になる部分よりも更に上下方向に短い楕円形）に形成することにより、プレス成形により凹部１３ａの開口は、真円形状となる。
なお、図１７（ｃ）に示すように、鍋の底面になる部分は、プレス成形によって左右上下の両方向均等に弱い引張力が掛かるが、形状はほとんど変化しないので、図１７（ｃ）に示すように、凹部１３ａの開口は予め真円形状に形成する。
【００３２】
以上のように、円形多層金属板１６の内面に凹部１３ａを形成する際には、鍋底面の凹部１３ａの開口面積に比べて、鍋側面の凹部１３ａの開口面積が小さくなるように加工することにより、プレス成形によって鍋底面の凹部１３ａと鍋側面の凹部１３ａとの開口面積を略同一にすることができる。同様に、円形多層金属板１６の内面に凹部１３ａを形成する際には、鍋底面の凹部１３ａの開口面積に比べて、鍋コーナーの凹部１３ａの開口面積が小さくなるように加工することにより、プレス成形によって鍋底面の凹部１３ａと鍋コーナーの凹部１３ａとの開口面積を略同一にすることができる。その結果、プレス成形後の各凹部１３ａの開口面積はいずれの部位も略同一となり、炊飯時の鍋内の加熱がより均一となる。
【００３３】
なお、鍋の側面、コーナー及び底面で凹部１３ａの開口形状を変えているのは、プレス成型後に各開口形状が略同一になるようにするためである。従って、必ずしも真円形状でなくてもよく、楕円形状、多角形状等であってもよい。また、円形多層金属板１６に形成する凹部１３ａは、図１８に示すように、楕円球面形状であってもよい。さらに、図１９に示すように、円形多層金属板１６の中央部分に温度測定エリア１５を設け、この温度測定エリア１５には、凹部１３ａを形成しないようにしてもよい。
【００３４】
【発明の効果】
本発明に係る誘導加熱調理用鍋は、外面の表面積よりも内面の表面積の方を大きくしたので、外側の磁性体金属層が電磁誘導加熱で発熱した場合に、この熱の多くは、表面積の大きな内面から放射される。その結果、炊飯時の火力が強力になり、炊飯性能が向上する。
【００３５】
また、誘導加熱調理用鍋の製造方法は、円形多層金属板の内面に多数の凹部を形成し、その後に鍋形状にプレス成形したので、加工のし難い鍋の内面に対しても容易に凹部を形成することができる。
【００３６】
さらに、本発明に係る炊飯器は、外面の表面積よりも内面の表面積の方が大きな誘導加熱調理用鍋を備えているので、誘導加熱コイルの駆動によって磁力線が発生し、磁性体金属層が電磁誘導加熱で発熱した場合に、この熱の多くは、表面積の大きな誘導加熱調理用鍋の内面から放射される。その結果、炊飯時の火力が強力になり、炊飯性能が向上する。
【図面の簡単な説明】
【図１】実施の形態１に係る炊飯器の構成を示す断面図である。
【図２】誘導加熱調理用鍋の内部側面形状を示す断面図である。
【図３】誘導加熱調理用鍋の内部底面形状を示す平面図である。
【図４】誘導加熱調理用鍋の断面構造を示す部分拡大図である。
【図５】誘導加熱調理用鍋の機能を示す部分拡大図である。
【図６】誘導加熱調理用鍋の機能を示す部分拡大図である。
【図７】誘導加熱調理用鍋の内部側面形状を示す断面図である。
【図８】（ａ）（ｂ）は、誘導加熱調理用鍋に設けられた凹部の形状を示す図である。（ｃ）は、図８（ｂ）のＡ−Ａ線における横断面図である。
【図９】（ａ）（ｂ）は、誘導加熱調理用鍋に設けられた凹部の形状を示す図である。（ｃ）は、図９（ｂ）のＡ−Ａ線における横断面図である。（ｄ）は、図９（ｂ）のＢ−Ｂ線における縦断面図である。
【図１０】実施の形態１の変形例に係る誘導加熱調理用鍋の内部側面形状を示す図である。
【図１１】実施の形態１の変形例に係る誘導加熱調理用鍋の内部側面形状を示す図である。
【図１２】実施の形態１の変形例に係る誘導加熱調理用鍋の内部底面形状を示す図である。
【図１３】実施の形態１の変形例に係る誘導加熱調理用鍋の内部底面形状を示す図である。
【図１４】実施の形態１の変形例を示す断面図である。
【図１５】実施の形態２の製造方法における誘導加熱調理用鍋の材料となる円形多層金属板を示す図である。
【図１６】（ａ）〜（ｃ）は、実施の形態２に係る誘導加熱調理用鍋の製造工程を示す断面図である。
【図１７】（ａ）は、鍋の側面になる部分におけるプレス成形の前後を示す図である。（ｂ）は、鍋のコーナーになる部分におけるプレス成形の前後を示す図である。（ｃ）は、鍋の底面になる部分におけるプレス成形の前後を示す図である。
【図１８】実施の形態２の製造方法における誘導加熱調理用鍋の材料となる円形多層金属板を示す図である。
【図１９】実施の形態２の製造方法における誘導加熱調理用鍋の材料となる円形多層金属板を示す図である。
【符号の説明】
１…炊飯器本体、２…蓋体、３…誘導加熱調理用鍋、３ａ…磁性体金属層、３ｂ…熱良導性金属層、３ｃ…フッ素樹脂コーティング層、４…誘導加熱コイル、４ａ…内コイル、４ｂ…外コイル、５…本体ケース、６…上ケース、７…下ケース、８…コイル台、９…操作パネル、１０…電源コードリール、１１…温度センサ、１２…制御部、１３ａ…凹部、１３ｂ…凸部、１４…水位目盛り表示エリア、１５…温度測定エリア、１６…円形多層金属板。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an induction cooking pot composed of a plurality of metal layers, a method of manufacturing the induction cooking pan, and a rice cooker using the induction cooking pan.
[0002]
[Prior art]
A conventional induction heating cooking pot is composed of two layers, an inner aluminum layer and an outer magnetic metal layer, and the outer surface of the magnetic metal layer is subjected to unevenness processing (for example, see Patent Document 1). .
[0003]
[Patent Document 1]
JP-A-9-129361 (pages 3, 4; FIG. 2)
[0004]
It should be noted that although it is different from the induction cooking pot, a reference example of a general cooking stove is described in, for example, JP-A-2001-238791.
[0005]
[Problems to be solved by the invention]
However, in the conventional induction heating cooking pot, the surface of the magnetic metal layer is increased due to the unevenness of the outer surface of the pot, and heat is easily released from the surface of the magnetic metal layer heated by electromagnetic induction. As a result, there is a problem that the heating efficiency of the pot is reduced.
[0006]
An object of the present invention is to solve such a problem and to provide a pot for induction heating cooking with high heating efficiency, a method for producing the pot for induction heating cooking, and a rice cooker.
[0007]
[Means for Solving the Problems]
The induction heating cooking pot of the present invention is an induction heating cooking pot composed of at least two metal layers of an outer magnetic metal layer and an inner heat conductive metal layer, wherein the surface area of the outer surface of the pot body is The inner surface has a larger surface area.
[0008]
Further, the method for producing the induction cooking pot of the present invention, the circular multi-layer metal plate composed of at least two metal layers of the outer magnetic metal layer and the inner heat conductive metal layer, A large number of recesses are formed on the inner surface thereof, and then they are press-formed into a pot shape.
[0009]
Further, the rice cooker of the present invention comprises a rice cooker main body, a lid covering an upper opening of the rice cooker main body, an induction heating cooking pot detachably housed in the rice cooker main body, and an induction heating cooking pot. And an induction heating coil for heating the induction heating cooking pot, the induction heating cooking pot is composed of at least two metal layers of an outer magnetic metal layer and an inner thermally conductive metal layer, Is a large surface area.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of an induction cooking pot, a method of manufacturing the induction cooking pot, and a rice cooker according to the present invention will be described with reference to the accompanying drawings.
Embodiment 1 FIG.
FIG. 1 is a cross-sectional view illustrating a configuration of the rice cooker according to Embodiment 1. In FIG. 1, reference numeral 1 denotes a rice cooker main body having an open upper portion, and reference numeral 2 denotes a rice cooker main body 1 which is attached via a hinge portion 1a provided at an upper rear portion of the rice cooker main body 1 so as to freely open and close the upper opening. The lid 3, 3 is an induction heating cooking pot accommodated in the rice cooker main body 1, 4 is an induction heating coil for electromagnetically heating the induction heating cooking pot 3, 5 is an upper case 6, a lower case 7, and a coil stand. 8 is a main body case of the rice cooker main body 1 composed of 8; Here, the induction heating coil 4 includes an inner coil 4a and an outer coil 4b arranged in a double annular shape.
[0011]
An operation panel 9 such as a rice cooker switch and a reservation switch is provided on an upper portion of the front side of the upper case 6, and a power cord reel extending from the upper case 6 to the lower case 7 is provided on the rear side in the rice cooker main body 1. 10 are provided. A temperature sensor 11 for detecting the temperature of the induction heating cooking pot 3 by contacting the bottom of the induction heating cooking pot 3 is provided substantially at the center of the coil stand 8 of the main body case 5. Is provided with a control unit 12 for controlling the operation of the rice cooker.
[0012]
Next, the structure of the induction cooking pot 3 will be described in detail with reference to FIGS. FIG. 2 is a sectional view showing the shape of the inner side surface of the induction cooking pot 3. FIG. 3 is a plan view showing the shape of the inner bottom surface of the induction cooking pot 3. FIG. 4 is a partially enlarged view showing a cross-sectional structure of the induction heating cooking pot 3. As shown in FIGS. 2 to 4, the induction heating cooking pot 3 is composed of two metal layers of an outer magnetic metal layer 3 a and an inner heat conductive metal layer 3 b, and has an inner surface. A fluororesin coating layer 3c is formed so that rice does not stick. The magnetic metal layer 3a is made of ferritic stainless steel, steel plate, or the like, and the thermally conductive metal layer 3b is made of aluminum or an aluminum alloy.
[0013]
Note that a fluororesin coating layer or a silicone-based non-adhesive coating layer may be formed on the outer surface of the magnetic metal layer 3a. Further, any metal may be used for the magnetic metal layer 3a as long as the metal can be induction-heated. Further, any metal may be used for the heat conductive metal layer 3b as long as it can transfer the heat of the magnetic metal layer 3a heated by induction to the inside of the pan.
[0014]
On the inner surface of the induction heating cooking pot 3, from the opposing portion of the inner coil 4a to the opposing portion of the outer coil 4b (that is, the portion opposing the induction heating coil 4), on a concentric circle centered on the center of the pot bottom, A large number of spherical concave portions 13a are formed radially. The peripheral portion of each recess 13a forms a projection 13b, and the inner surface of the induction heating cooking pot 3 is uneven. On the other hand, the outer surface of the induction heating cooking pot 3 is not smoothed at all, and has a smooth flat surface.
[0015]
Therefore, the induction heating pot 3 has a larger surface area on the inner surface than on the outer surface. As a result, when lines of magnetic force are generated by driving the induction heating coil 4 and the magnetic metal layer 3a generates heat by electromagnetic induction heating, much of this heat is radiated from the inner surface of the induction heating cooking pot 3 having a large surface area. . Therefore, the heating power at the time of rice cooking becomes strong, and the rice cooking performance is improved. In addition, since the inner surface of the induction heating cooking pot 3 is uneven, the contact area with water in the pot increases, and heating with high thermal efficiency becomes possible. Furthermore, since the inner surface of the induction heating cooking pot 3 is uneven, contact with and contact with rice grains increase, and rice can be sharpened quickly with a light force.
[0016]
Further, by providing the recess 13a on the inner surface of the induction heating cooking pot 3, it is possible to effectively generate convection in the pot. That is, as shown in FIG. 5, when the magnetic metal layer 3a generates heat by electromagnetic induction heating, this heat passes through the thermally conductive metal layer 3b and is radiated from the inner surface of the induction heating cooking pot 3. . At this time, the distance through which heat passes is greatly different between the bottom surface of the concave portion 13a and the convex portion 13b. That is, as compared with the distance L1 from the bonding surface between the magnetic metal layer 3a and the thermally conductive metal layer 3b to the bottom surface of the recess 13a, the protrusion from the bonded surface between the magnetic metal layer 3a and the thermally conductive metal layer 3b is higher. The distance L2 to the portion 13b is longer.
[0017]
As a result, heat loss due to the passage of the heat conductive metal layer 3b is smaller at the bottom surface of the concave portion 13a than at the convex portion 13b, and the surface temperature t1 of the bottom surface of the concave portion 13a is lower than the surface temperature t2 of the convex portion 13b. Is higher. Then, convection is generated in the pot due to the difference (t1-t2) between the surface temperatures of the concave portion 13a and the convex portion 13b, and rice grains can be circulated in the pot appropriately. As a result, it is possible to cook plump rice with less uneven cooking.
[0018]
As shown in FIG. 6, the induction heating cooking pot 3 is configured such that the outer diameter of the recess 13a is longer than the long side of the rice grain. For this reason, the following effects can be obtained. First, rice grains easily enter the recesses 13a, and the rice grains can be sufficiently heated in the recesses 13a. Secondly, since a gap is formed between the rice grains that have entered the recess 13a and the recess 13a, convection of water during rice cooking enters the gap and acts to push up the rice grains. As a result, the rice grains in the recess 13a can be easily separated from the recess 13a, and the clogging of the rice grains in the recess 13a is suppressed. Therefore, a sufficient heat radiation area is secured, and the thermal efficiency of the induction heating cooking pot 3 is improved.
[0019]
Third, the alignment of the stacked rice grains is disturbed by the rice grains that have entered the recess 13a, and the friction between the rice grains is improved when polishing the rice. For this reason, the force applied to the rice grains when polishing the rice is dispersed, and cracking of the rice grains can be effectively prevented. In addition, since the friction between the rice grains is good, the power spreads to many rice grains in one rice sharpening, so that the time for grinding the rice can be shortened.
[0020]
Further, the induction cooking pot 3 is configured such that the depth of the recess 13a is shallower than the short side of the rice grain. For this reason, the following effects can be obtained. First, since the upper end of the rice grain that has entered the recess 13a protrudes from the recess 13a, the convection of water during cooking directly hits the upper end of the rice grain. As a result, the rice grains can be easily separated from the recess 13a, and the clogging of the rice grains in the recess 13a is suppressed. Therefore, a sufficient heat radiation area is secured, and the thermal efficiency of the induction heating cooking pot 3 is improved. Secondly, when polishing rice, a force is directly applied to the upper end of the rice grains protruding from the recess 13a, so that the rice grains efficiently move in the pot without remaining in the recess 13a. For this reason, the circulation of the rice grains in the pot is accelerated, and the rice can be ground more uniformly.
[0021]
Each of the effects described above is surely exerted if the recess 13a is formed at least in a portion facing the induction heating coil 4. However, the formation position of the concave portion 13a is not limited to only the portion opposed to the induction heating coil 4, and as shown in FIG. Is also good. Further, a configuration may be adopted in which a concave portion 13a is formed at a portion facing the inner coil 4a, and the concave portion 13a is not formed at a portion facing the outer coil 4b. Further, the portion facing the induction heating coil 4 may be configured to be divided into a portion where the concave portion 13a is formed and a portion where the concave portion 13a is not formed. With such a configuration, it is possible to cause a change in convection in the pot at the time of cooking rice, the circulation of rice grains in the pot is promoted, and the heating efficiency is improved.
[0022]
Further, the shape of the concave portion 13a is not limited to a spherical shape or an elliptical spherical shape, and may be, for example, a quadrangular pyramid shape as shown in FIGS. 8 (a) to 8 (c), or FIGS. 9 (a) to 9 (d). (A side triangular pyramid shape) as shown in FIG. Further, a combination of different shapes may be used.
[0023]
FIG. 10 is a diagram showing the shape of the inner side surface of induction heating cooking pot 3 according to a modification of the first embodiment. As shown in FIG. 10, a substantially flat water level scale display area 14 is provided on the inner side surface of the induction cooking pot 3 without forming the recess 13 a. In the water level scale display area 14, a "water level scale" indicating the water level of the water filled in the pot is printed. By printing the "water level scale" on the substantially flat water level scale display area 14, blurring of the printing can be reliably prevented. In addition, the water level scale display area 14 may be single or may be provided at equal intervals.
[0024]
FIG. 11 is a diagram showing an inner side surface shape of the induction heating cooking pot 3 according to another modification of the first embodiment. As shown in FIG. 11, the concave portion 13a formed on the side surface of the induction heating cooking pot 3 has an elliptical spherical shape with a long side extending vertically. For this reason, when dressing rice with a scoop after cooking rice, by moving the tip of the scoop from top to bottom along the side surface of the induction heating cooking pot 3, the rice grains in the concave portion 13a have an elliptical shape with a gentle slope. It moves in the long side direction and separates from the inside of the concave portion 13a. As a result, sticking of the rice grains in the concave portion 13a is eliminated, and the cleaning of the induction heating cooking pot 3 is facilitated.
[0025]
FIG. 12 is a diagram showing an inner bottom surface shape of the induction heating cooking pot 3 according to another modification of the first embodiment. As shown in FIG. 12, the concave portion 13a formed on the bottom surface of the induction heating cooking pot 3 has an elliptical spherical shape whose long sides extend radially. For this reason, when dressing rice with a scoop after cooking rice, by moving the tip of the scoop from the center to the periphery along the bottom surface of the induction cooking pot 3, the rice grains in the recess 13a have a gentle elliptical shape. It moves in the long side direction and separates from the inside of the concave portion 13a. As a result, sticking of the rice grains in the concave portion 13a is eliminated, and the cleaning of the induction heating cooking pot 3 is facilitated.
[0026]
13 and 14 are diagrams showing another modification of the first embodiment. As shown in FIG. 13, a substantially flat temperature measurement area 15 is provided on the bottom surface of the induction heating cooking pot 3 without forming the recess 13 a. Then, as shown in FIG. 14, a temperature sensor 11 is disposed on the lower surface facing the temperature measurement area 15. For this reason, the heat inside the induction heating cooking pot 3 reaches the temperature sensor 11 with a very small loss through the substantially flat temperature measurement area 15, so that the accurate temperature inside the induction heating cooking pot 3 is detected by the temperature sensor 11. It is possible to do.
[0027]
Embodiment 2 FIG.
Next, a method for manufacturing the induction cooking pot according to Embodiment 2 will be described. The induction heating pot 3 described in detail in the first embodiment is manufactured by the manufacturing method of the second embodiment. Therefore, the same reference numerals are given to the same or equivalent components as in the first embodiment, and description thereof will be omitted.
[0028]
FIG. 15 is a view showing a circular multilayer metal plate 16 which is a material of the induction heating cooking pot 3. As shown in FIG. 16A, the circular multilayer metal plate 16 includes a plurality of metal layers (a magnetic metal layer 3a and a thermally conductive metal layer 3b). Then, as shown in FIGS. 15 and 16 (b), a large number of spherical concave portions 13a are formed in the central portion of the circular multilayer metal plate 16 on the side of the heat conductive metal layer 3b. Here, it is assumed that no concave portion 13a is formed in a pair of rectangular water level scale display areas 14 provided above and below. Thereafter, the heat conductive metal layer 3b is pressed into a pot shape with the side of the heat conductive metal layer 3b inside, and a fluororesin coating layer 3c is formed on the upper surface of the heat conductive metal layer 3b as shown in FIG. Thereby, the induction heating cooking pot 3 shown in FIGS. 2 and 3 is completed.
[0029]
In the manufacturing method of the present embodiment, the recess 13a is formed before the circular multilayer metal plate 16 is press-formed, so that the recess 13a can be easily formed even on the inner surface of the pot that is difficult to process. . Further, by forming the fluororesin coating layer 3c after press molding, it is possible to prevent the fluororesin coating layer 3c from being damaged by the pressing force at the time of press molding.
[0030]
The concave portion 13a formed in the circular multilayer metal plate 16 has a portion that becomes a side surface of the pot by press forming, a portion that becomes a corner of the pot by pressing (a boundary portion between the side surface and the bottom surface of the pot), and a portion of the pot that is pressed by pressing. The shape may be changed depending on the portion to be the bottom surface. That is, as shown in FIG. 17 (a), the side portion of the pot is pulled up and down and compressed in the left and right direction, and the opening of the recess 13a extends up and down. Therefore, by forming the opening of the recess 13a in an elliptical shape that is long in the left-right direction and short in the up-down direction in advance, the opening of the recess 13a becomes a perfect circle by press molding.
[0031]
In addition, as shown in FIG. 17B, the corner portion of the pot is further pulled in the vertical direction than the side portion of the pot, and the opening of the recess 13a extends vertically. Therefore, by forming the opening of the concave portion 13a in advance into an elliptical shape which is short in the vertical direction (an elliptical shape which is shorter in the vertical direction than the portion which becomes the side surface of the pan), the opening of the concave portion 13a has a perfect circular shape by press molding. Become.
In addition, as shown in FIG. 17 (c), the portion to be the bottom of the pan is subjected to a weak pulling force equally in both the left, right, up and down directions by press molding, but the shape is hardly changed, so that it is shown in FIG. 17 (c). As described above, the opening of the concave portion 13a is formed in a perfect circular shape in advance.
[0032]
As described above, when forming the concave portion 13a on the inner surface of the circular multilayer metal plate 16, processing is performed so that the opening area of the concave portion 13a on the side surface of the pot is smaller than the opening area of the concave portion 13a on the bottom surface of the pan. Accordingly, the opening area of the recess 13a on the bottom of the pot and the recess 13a on the side of the pot can be made substantially the same by press molding. Similarly, when forming the recess 13a on the inner surface of the circular multilayer metal plate 16, by processing so that the opening area of the recess 13a at the pot corner is smaller than the opening area of the recess 13a at the bottom of the pot, The opening area of the recess 13a on the bottom of the pot and the recess 13a on the corner of the pot can be made substantially the same by press molding. As a result, the opening area of each of the recesses 13a after the press molding becomes substantially the same at all the portions, and the heating in the pot during cooking rice becomes more uniform.
[0033]
The reason why the shape of the opening of the recess 13a is changed at the side, the corner, and the bottom of the pot is to make the shapes of the openings substantially the same after press molding. Therefore, the shape need not always be a perfect circle, but may be an ellipse, a polygon, or the like. Further, the concave portion 13a formed in the circular multilayer metal plate 16 may have an elliptical spherical shape as shown in FIG. Further, as shown in FIG. 19, a temperature measurement area 15 may be provided at the center of the circular multilayer metal plate 16, and the depression 13a may not be formed in this temperature measurement area 15.
[0034]
【The invention's effect】
Since the induction heating cooking pot according to the present invention has a larger inner surface area than an outer surface surface area, when the outer magnetic metal layer generates heat by electromagnetic induction heating, most of this heat is reduced by the surface area. Radiated from a large inner surface. As a result, the heating power at the time of rice cooking becomes strong, and the rice cooking performance is improved.
[0035]
In addition, the method of producing a pot for induction heating cooking involves forming a large number of recesses on the inner surface of a circular multilayer metal plate and then press-molding it into a pot shape, so that recesses can be easily formed on the inner surface of a pot that is difficult to process. Can be formed.
[0036]
Furthermore, since the rice cooker according to the present invention is provided with the induction heating cooking pot in which the surface area of the inner surface is larger than the surface area of the outer surface, the lines of magnetic force are generated by the driving of the induction heating coil, and the magnetic metal layer becomes electromagnetic. When heat is generated by induction heating, much of this heat is radiated from the inner surface of the induction heating cooking pot having a large surface area. As a result, the heating power at the time of rice cooking becomes strong, and the rice cooking performance is improved.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view illustrating a configuration of a rice cooker according to Embodiment 1.
FIG. 2 is a cross-sectional view showing an inner side surface shape of the induction cooking pot.
FIG. 3 is a plan view showing the shape of the inner bottom surface of the induction cooking pot.
FIG. 4 is a partially enlarged view showing a cross-sectional structure of the induction cooking pot.
FIG. 5 is a partially enlarged view showing the function of the induction cooking pot.
FIG. 6 is a partially enlarged view showing the function of the induction cooking pot.
FIG. 7 is a cross-sectional view showing an inner side surface shape of the induction cooking pot.
FIGS. 8 (a) and (b) are views showing the shape of a recess provided in an induction heating cooking pot. FIG. 9C is a cross-sectional view taken along line AA of FIG. 8B.
FIGS. 9A and 9B are diagrams showing the shape of a concave portion provided in the induction cooking pot. FIG. 10C is a transverse sectional view taken along line AA of FIG. 9B. FIG. 10D is a longitudinal sectional view taken along line BB of FIG. 9B.
FIG. 10 is a diagram showing an inner side surface shape of an induction heating cooking pot according to a modification of the first embodiment.
FIG. 11 is a diagram showing an inner side surface shape of an induction cooking pot according to a modification of the first embodiment.
FIG. 12 is a diagram showing the shape of the inner bottom surface of the induction cooking pot according to a modification of the first embodiment.
FIG. 13 is a diagram showing the shape of the inner bottom surface of the induction cooking pot according to a modification of the first embodiment.
FIG. 14 is a cross-sectional view illustrating a modification of the first embodiment.
FIG. 15 is a view showing a circular multilayer metal plate as a material of an induction heating cooking pot in the manufacturing method according to the second embodiment.
16 (a) to 16 (c) are cross-sectional views illustrating steps for manufacturing an induction cooking pot according to Embodiment 2. FIG.
FIG. 17 (a) is a diagram showing before and after press forming in a portion to be a side surface of the pan. (B) is a figure which shows before and after press molding in the part used as the corner of a pot. (C) is a figure which shows before and after press molding in the part used as the bottom of a pan.
FIG. 18 is a diagram showing a circular multilayer metal plate as a material of an induction heating cooking pot in the manufacturing method according to the second embodiment.
FIG. 19 is a view showing a circular multi-layer metal plate as a material of an induction heating cooking pot in the production method of the second embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Rice cooker main body, 2 ... Lid body, 3 ... Induction heating cooking pot, 3a ... Magnetic metal layer, 3b ... Thermal conductive metal layer, 3c ... Fluororesin coating layer, 4 ... Induction heating coil, 4a ... Inner coil, 4b Outer coil, 5 Body case, 6 Upper case, 7 Lower case, 8 Coil stand, 9 Operation panel, 10 Power cord reel, 11 Temperature sensor, 12 Controller, 13a ... recess, 13b ... convex, 14 ... water level scale display area, 15 ... temperature measurement area, 16 ... circular multilayer metal plate.

Claims (15)

外側の磁性体金属層と内側の熱良導性金属層との少なくとも２層の金属層で構成された誘導加熱調理用鍋において、
鍋本体の外面の表面積より内面の表面積を大きくしたことを特徴とする誘導加熱調理用鍋。In an induction heating cooking pot composed of at least two metal layers of an outer magnetic metal layer and an inner heat conductive metal layer,
A pot for induction heating cooking, wherein the inner surface area is larger than the outer surface area of the pot body. 前記鍋本体の内面には、多数の凹部が形成されていることを特徴とする請求項１記載の誘導加熱調理用鍋。The induction heating cooking pot according to claim 1, wherein a number of recesses are formed on an inner surface of the pot body. 前記凹部の外径は、米粒の長辺より長いことを特徴とする請求項２記載の誘導加熱調理用鍋。3. The induction cooking pot according to claim 2, wherein the outer diameter of the recess is longer than a long side of the rice grain. 前記凹部の深さは、米粒の短辺より浅いことを特徴とする請求項２記載の誘導加熱調理用鍋。3. The induction heating cooking pot according to claim 2, wherein the depth of the recess is smaller than a short side of the rice grain. 前記鍋本体の側面には、前記凹部が形成されずに略平坦な水位目盛り表示エリアが設けられていることを特徴とする請求項２から請求項４のいずれか一項記載の誘導加熱調理用鍋。5. The induction heating cooking device according to claim 2, wherein a substantially flat water level scale display area is provided on a side surface of the pot main body without forming the concave portion. 6. pot. 前記鍋本体の側面に形成された前記凹部は、長辺を上下に延ばした楕円球面形状を有することを特徴とする請求項２から請求項５のいずれか一項に記載の誘導加熱調理用鍋。The pot for induction heating cooking according to any one of claims 2 to 5, wherein the concave portion formed on a side surface of the pot main body has an elliptical spherical shape with a long side extending vertically. . 前記鍋本体の底面に形成された前記凹部は、長辺を放射状に延ばした楕円球面形状を有することを特徴とする請求項２から請求項５のいずれか一項に記載の誘導加熱調理用鍋。The pot for induction heating cooking according to any one of claims 2 to 5, wherein the concave portion formed on the bottom surface of the pot main body has an elliptical spherical shape with a long side extending radially. . 前記鍋本体の底面には、前記凹部が形成されずに略平坦な温度測定エリアが設けられていることを特徴とする請求項１から請求項７のいずれか一項記載の誘導加熱調理用鍋。The pot for induction heating cooking according to any one of claims 1 to 7, wherein a bottom surface of the pot main body is provided with a substantially flat temperature measurement area without forming the concave portion. . 外側の磁性体金属層と内側の熱良導性金属層との少なくとも２層の金属層で構成された円形多層金属板に対して、その内面に多数の凹部を形成し、その後に鍋形状にプレス成形したことを特徴とする誘導加熱調理用鍋の製造方法。For a circular multilayer metal plate composed of at least two metal layers of an outer magnetic metal layer and an inner thermal conductive metal layer, a number of recesses are formed on the inner surface of the circular metal plate. A method for producing an induction heating cooking pot, which is press-formed. 前記円形多層金属板の内面に前記凹部を形成する際には、鍋底面の前記凹部の開口面積に比べて、鍋側面の前記凹部の開口面積が小さくなるように加工し、プレス成形によって鍋底面の前記凹部と鍋側面の前記凹部との開口面積が略同一になるようにしたことを特徴とする請求項９記載の誘導加熱調理用鍋の製造方法。When forming the concave portion on the inner surface of the circular multilayer metal plate, processing is performed such that the opening area of the concave portion on the side of the pot is smaller than the opening area of the concave portion on the bottom surface of the pan, and the pot bottom surface is formed by press molding. 10. The method of manufacturing a pot for induction heating cooking according to claim 9, wherein the opening area of the recess and the recess on the side of the pot are substantially the same. 前記円形多層金属板の内面に前記凹部を形成する際には、鍋底面の前記凹部の開口面積に比べて、鍋コーナーの前記凹部の開口面積が小さくなるように加工し、プレス成形によって鍋底面の前記凹部と鍋コーナーの前記凹部との開口面積が略同一になるようにしたことを特徴とする請求項９記載の誘導加熱調理用鍋の製造方法。When the recess is formed on the inner surface of the circular multilayer metal plate, the opening area of the recess at the corner of the pot is processed to be smaller than the opening area of the recess at the bottom of the pot, and the bottom of the pot is formed by press molding. The method for producing a pot for induction heating cooking according to claim 9, wherein the opening area of the concave portion and the concave portion of the pot corner are substantially the same. プレス成形後に、内面にフッ素加工を施したことを特徴とする請求項９から請求項１１のいずれか一項に記載の誘導加熱調理用鍋の製造方法。The method for producing a pot for induction heating cooking according to any one of claims 9 to 11, wherein the inner surface is subjected to fluorine processing after press molding. 炊飯器本体と、該炊飯器本体の上部開口部を覆う蓋体と、前記炊飯器本体内に着脱可能に収容される誘導加熱調理用鍋と、該誘導加熱調理用鍋を加熱する誘導加熱コイルとを備え、
前記誘導加熱調理用鍋は、外側の磁性体金属層と内側の熱良導性金属層との少なくとも２層の金属層で構成され、鍋本体の外面より内面の表面積を大きくしたことを特徴とする炊飯器。A rice cooker main body, a lid covering an upper opening of the rice cooker main body, an induction cooking pot removably housed in the rice cooker main body, and an induction heating coil for heating the induction cooking pan With
The induction heating cooking pot is constituted by at least two metal layers of an outer magnetic metal layer and an inner heat conductive metal layer, and has a larger inner surface area than the outer surface of the pot body. Rice cooker. 前記鍋本体の内面には、多数の凹部が設けられていることを特徴とする請求項１３記載の炊飯器。14. The rice cooker according to claim 13, wherein a number of recesses are provided on an inner surface of the pot body. 前記凹部は、少なくとも前記誘導加熱コイルに対向する部位に設けられていることを特徴とする請求項１４記載の炊飯器。The rice cooker according to claim 14, wherein the recess is provided at least in a portion facing the induction heating coil.
JP2003052900A 2003-02-28 2003-02-28 Induction heating cooking pan and rice cooker Expired - Fee Related JP4395310B2 (en)

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JP2015029816A (en) * 2013-08-06 2015-02-16 シャープ株式会社 Inner pot for heat cooking and rice cooker
JP2015150396A (en) * 2014-02-19 2015-08-24 象印マホービン株式会社 Manufacturing method of cooking pot, and cooking pot
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CN116250715A (en) * 2022-12-05 2023-06-13 九阳股份有限公司 Rice cooking utensil
CN116250715B (en) * 2022-12-05 2023-09-05 九阳股份有限公司 Rice cooking utensil

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