JPH0852064A - Rice cooker - Google Patents
Rice cookerInfo
- Publication number
- JPH0852064A JPH0852064A JP19299794A JP19299794A JPH0852064A JP H0852064 A JPH0852064 A JP H0852064A JP 19299794 A JP19299794 A JP 19299794A JP 19299794 A JP19299794 A JP 19299794A JP H0852064 A JPH0852064 A JP H0852064A
- Authority
- JP
- Japan
- Prior art keywords
- pan
- pot
- induction heating
- wall
- rice cooker
- 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.)
- Granted
Links
Landscapes
- Cookers (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、磁性材料製の誘導発熱
部を有する鍋に対して誘導加熱コイルにより誘導電流を
発生させて加熱調理を行うようにした炊飯器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rice cooker in which an induction heating coil is used to generate an induction current in a pan having an induction heating portion made of a magnetic material for heating and cooking.
【０００２】[0002]
【従来の技術】この種の炊飯器に用いられる鍋として
は、クラッド材が用いられることが知られている。この
クラッド材は、熱伝導特性が良いアルミニウムと磁性材
料である磁性ステンレスを平板の状態でロール圧接した
鋼板であり、これを、絞り加工することにより外側に磁
性ステンレスが配設される円筒容器状に形成して鍋を製
造している。これにより鍋は、外面が誘導発熱部を構成
する磁性ステンレスにより覆われ、内面が熱伝導部を構
成するアルミニウムにより覆われた状態に形成される。2. Description of the Related Art It is known that a clad material is used as a pot used in this type of rice cooker. This clad material is a steel plate in which aluminum with good thermal conductivity and magnetic stainless steel, which is a magnetic material, are rolled and pressure-bonded in a flat plate state. Is manufactured into a pot. As a result, the pan is formed such that the outer surface is covered with the magnetic stainless steel forming the induction heating portion and the inner surface is covered with aluminum forming the heat conducting portion.
【０００３】この鍋は、誘導加熱コイルにより発熱され
るようになっている。すなわち、誘導加熱コイルを鍋の
外方に設け、この誘導加熱コイルに高周波電流を通電す
ることにより、鍋の誘導発熱部に誘導電流を発生させ、
その抵抗損失により発熱させると共に、その熱を熱伝導
部を介して鍋の全体に渡って伝導させて鍋内部を加熱す
るようにしている。This pan is designed to be heated by an induction heating coil. That is, the induction heating coil is provided outside the pan, and by applying a high frequency current to the induction heating coil, an induction current is generated in the induction heating part of the pan,
The resistance loss causes heat to be generated and at the same time, the heat is conducted to the entire pot via the heat conducting portion to heat the inside of the pot.
【０００４】[0004]
【発明が解決しようとする課題】ところが、上述のクラ
ッド材を使用して鍋を構成しようとすると、通常、該ク
ラッド材をプレスにて深絞り加工するしかなく、形状等
の設計の自由度も低いといった欠点がある。However, when trying to construct a pot using the above-mentioned clad material, usually, the clad material has to be deep-drawn by pressing, and the degree of freedom in designing the shape and the like is also high. It has the drawback of being low.
【０００５】また全体が二重板構造であるので、熱伝達
性も良くないという問題がある。すなわち、誘導発熱部
としての磁性ステンレスの熱伝導率は０．０６２（ｃａ
ｌ／ｃｍ・ｓｅｃ・℃）程度であり、一方、熱伝導部と
してのアルミニウムの熱伝導率は０．５３（ｃａｌ／ｃ
ｍ・ｓｅｃ・℃）程度であるから、誘導発熱部は、熱伝
導部に比べてその熱伝導率の大きさが１／８．５程度で
あり、熱伝達にはほとんど寄与していないことになる。
さらに、磁性ステンレスは単位体積当りの熱容量が０．
８５（ｃａｌ／℃・ｃｍ３）程度であるから、アルミニ
ウムの０．５９（ｃａｌ／℃・ｃｍ３）程度の値と比べ
ると熱効率が悪くなる。Further, since the whole has a double plate structure, there is a problem that the heat transfer property is not good. That is, the thermal conductivity of the magnetic stainless steel as the induction heating portion is 0.062 (ca).
1 / cm.sec..degree. C.), while the thermal conductivity of aluminum as the heat conducting portion is 0.53 (cal / c).
(m · sec · ° C.), the induction heating part has a thermal conductivity of about 1 / 8.5 as compared with the heat conducting part, which means that it hardly contributes to heat transfer. Become.
Furthermore, magnetic stainless steel has a heat capacity of 0.
Since it is about 85 (cal / ° C · cm 3 ), the thermal efficiency becomes worse than the value of about 0.59 (cal / ° C · cm 3 ) for aluminum.
【０００６】したがって、このような材料の特性上か
ら、磁性ステンレス製の誘導発熱部部分は自己の熱容量
の分だけ熱損失することになるのである。ところが、鍋
を構成するのにクラッド材を用いているため、鍋全体を
磁性ステンレスで包囲する構成とせざるを得ず、この結
果、全体として熱的な効率が低下してしまうという不具
合がある。Therefore, due to the characteristics of such a material, the induction heating portion made of magnetic stainless steel loses heat by an amount corresponding to its own heat capacity. However, since the clad material is used to form the pot, the entire pot must be surrounded by magnetic stainless steel, resulting in a decrease in thermal efficiency as a whole.
【０００７】これを解決するものとして、ダイキャスト
や鍛造、あるいは溶湯鍛造技術といった鋳造・鍛造技術
を鍋製造に用いることを出願人は考えている。例えば、
溶湯鍛造技術にて、鍋を製造する場合、成形型のキャビ
ティ内部に、磁性ステンレスを配置しておき、そのキャ
ビティ内に、溶融した熱良導体材料を注入し加圧して固
化させる。これにより、熱良導体材料から容器状の熱伝
導部が形成されると共に、磁性材料からなる誘導発熱部
が前記固化に伴い予めこの熱伝導部の外底面部から外周
面部にかけて取着され、もって、鍋が製造される。この
ような鋳造・鍛造技術を用いて鍋を製造すると、形状等
の設計の自由度が高く、しかも誘導発熱部も必要箇所に
設けることが可能となり、熱的効率の向上も図ることが
可能となる。As a solution to this, the applicant considers that casting / forging technology such as die casting, forging, or molten metal forging technology is used for pot manufacturing. For example,
When manufacturing a ladle by the molten metal forging technique, magnetic stainless steel is placed inside the cavity of the mold, and the molten good thermal conductor material is injected into the cavity and pressed to solidify. As a result, a container-shaped heat conduction part is formed from a good thermal conductor material, and the induction heating part made of a magnetic material is attached in advance along with the solidification from the outer bottom face part to the outer peripheral face part of the heat conduction part, so that, The pot is manufactured. When a pot is manufactured using such casting / forging technology, the degree of freedom in designing the shape and the like is high, and it is also possible to install the induction heating part at the required location, and it is also possible to improve the thermal efficiency. Become.
【０００８】ところが、その反面、鍋製造時において、
磁性材料がほぼ１００℃程度の温度状態であるのに対
し、溶融した熱良導体材料は８００℃といった高温度状
態となり、この状態から熱収縮するため大きな残留応力
が発生する。これは鍋自体の大きさ等にも影響される
が、通常、鍋の底壁部周縁から周側壁部にかけてのコー
ナー部に残留応力の応力集中が起きる。この場合、鍋材
料が上述したアルミニウムとステンレスの場合、剪断応
力に対する耐力は５ｋｇ／ｍｍ２程度であるので、鍋が
そのコーナー部で亀裂したり、あるいは熱伝導部と誘導
発熱部とが剥離したりする虞がある。However, on the other hand, at the time of pan production,
While the magnetic material is in a temperature state of about 100 ° C., the molten good thermal conductor material is in a high temperature state of 800 ° C., and heat shrinks from this state, so that a large residual stress is generated. Although this is also affected by the size of the pan itself, etc., stress concentration of residual stress usually occurs at the corner portion from the peripheral edge of the bottom wall of the pan to the peripheral side wall. In this case, when the pot material is aluminum and stainless steel as described above, the yield strength against shear stress is about 5 kg / mm 2 , so the pot cracks at its corners, or the heat conduction part and the induction heating part are separated. There is a risk that
【０００９】本発明は上記事情に鑑みてなされたもので
あり、従ってその目的は、鍋の設計の自由度が高く、し
かも誘導発熱部も必要箇所に設けることが可能となり、
熱的効率の向上も図ることが可能となり、しかも、鍋に
おける底壁部周縁から周側壁部にかけてのコーナー部に
亀裂や剥離が発生することがない炊飯器を提供するにあ
る。The present invention has been made in view of the above circumstances. Therefore, the object thereof is to have a high degree of freedom in designing a pan, and further, an induction heating portion can be provided in a necessary portion.
It is possible to improve the thermal efficiency, and to provide a rice cooker in which cracks and peeling do not occur at the corners of the pan from the peripheral edge of the bottom wall to the peripheral side wall.
【００１０】[0010]
【課題を解決するための手段】第１の手段は、溶融した
熱良導体材料が固化して容器状の熱伝導部が形成され、
且つこの熱伝導部の外底面部から外周面部にかけて磁性
材料からなる誘導発熱部が前記固化に伴い予め取着され
てなる鍋と、この鍋の外方に配置された誘導加熱コイル
とを備え、前記鍋の規定最高水位線での直径寸法をＤと
したとき、該鍋の底壁部周縁から周側壁部にかけてのコ
ーナー部を、内壁面および外壁面の曲率半径が０．０５
Ｄ以上となる円弧壁部により形成したところに特徴を有
するものである（請求項１の発明）。[Means for Solving the Problems] The first means is to form a container-like heat conducting portion by solidifying a molten good thermal conductor material.
And a pan formed by attaching an induction heating part made of a magnetic material in advance from the outer bottom face part to the outer peripheral face part of the heat conducting part along with the solidification, and an induction heating coil arranged outside the pan, When the diameter dimension of the pan at the prescribed maximum water level line is D, the radius of curvature of the inner wall surface and the outer wall surface of the corner portion from the peripheral edge of the bottom wall to the peripheral wall of the pan is 0.05.
It is characterized in that it is formed by an arc wall portion having a size of D or more (the invention of claim 1).
【００１１】第２の手段は、第１の手段において、鍋の
底壁部の広さが周側壁部上端部の広さより小さく、該底
壁部より周側壁部上方へ上広がり状の傾斜部が形成さ
れ、底壁部と該傾斜部とにかけてのコーナー部が円弧壁
部により形成されているところに特徴を有する（請求項
２の発明）。According to a second means, in the first means, the breadth of the bottom wall portion of the pan is smaller than the breadth of the upper end portion of the peripheral side wall portion, and the inclined portion extends upward from the bottom wall portion to the peripheral side wall portion. Is formed, and the corner portion between the bottom wall portion and the inclined portion is formed by the arc wall portion (the invention of claim 2).
【００１２】第３の手段は、第１の手段において、誘導
加熱コイルは鍋の底壁部周縁を加熱する部位に設けら
れ、この誘導加熱コイルと鍋の円弧壁部とが対応する位
置関係にあるところに特徴を有する（請求項３の発
明）。A third means is the induction heating coil according to the first means, which is provided at a portion for heating the peripheral edge of the bottom wall of the pan, and the induction heating coil and the arc wall of the pan have a corresponding positional relationship. There is a feature in a certain point (the invention of claim 3).
【００１３】第４の手段は、第２の手段において、傾斜
部が、曲率半径が０．５Ｄ以上の円弧壁状に形成されて
いるところに特徴を有する（請求項４の発明）。A fourth means is characterized in that, in the second means, the inclined portion is formed in an arc wall shape having a radius of curvature of 0.5 D or more (invention of claim 4).
【００１４】第５の手段は、溶融した熱良導体材料が固
化して容器状の熱伝導部が形成され、且つこの熱伝導部
の外底面部から外周面部にかけて磁性材料からなる誘導
発熱部が前記固化に伴い予め取着されてなる鍋と、この
鍋の外方に配置された誘導加熱コイルとを備え、前記鍋
の底壁部周縁から周側壁部にかけてのコーナー部を、内
壁面および外壁面の曲率半径が１０［ｍｍ］以上となる
円弧壁部により形成したところに特徴を有する（請求項
５の発明）。In the fifth means, a molten good thermal conductor material is solidified to form a container-shaped heat conducting portion, and an induction heating portion made of a magnetic material is formed from the outer bottom surface portion to the outer peripheral surface portion of the heat conducting portion. The pan is preliminarily attached with solidification, and the induction heating coil is arranged on the outside of the pan. The inner wall and the outer wall are provided with a corner portion from the peripheral edge of the bottom wall of the pan to the peripheral side wall. Is characterized by being formed by an arc wall portion having a radius of curvature of 10 [mm] or more (invention of claim 5).
【００１５】第６の手段は、第１の手段または第５の手
段において、鍋の熱伝導部が、溶湯鍛造により形成され
ているところに特徴を有する（請求項６の発明）。A sixth means is characterized in that, in the first means or the fifth means, the heat conducting portion of the pot is formed by molten metal forging (the invention of claim 6).
【００１６】[0016]
【作用】第１の手段においては、鍋における熱伝導部
が、溶融した熱良導体材料が固化して容器状に形成さ
れ、且つこの熱伝導部の外底面部から外周面部にかけて
磁性材料からなる誘導発熱部が前記固化に伴い予め取着
されるから、クラッド材を鍋に使用した場合と違って、
鍋の設計の自由度が高く、しかも誘導発熱部も必要箇所
に設けることが可能となり、熱的効率の向上も図ること
が可能となる。また、前記鍋の規定最高水位線での直径
寸法をＤとしたとき、該鍋の底壁部周縁から周側壁部に
かけてのコーナー部を、内壁面および外壁面の曲率半径
が０．０５Ｄ以上となる円弧壁部により形成したから、
該コーナー部での鍋の残留応力の集中度合いを軽減でき
るようになり、鍋に亀裂や剥離が発生することがない。In the first means, the heat-conducting portion of the pot is formed by melting the molten good thermal conductor material into a container shape, and is made of a magnetic material from the outer bottom surface portion to the outer peripheral surface portion of the heat-conducting portion. Since the heat generating part is attached in advance with the solidification, unlike when using a clad material for the pan,
The degree of freedom in the design of the pan is high, and it is possible to install the induction heating part in the necessary place, and it is also possible to improve the thermal efficiency. When the diameter dimension of the pan at the prescribed maximum water level line is D, the corner portion from the peripheral edge of the bottom wall to the peripheral side wall has a radius of curvature of 0.05 D or more on the inner wall surface and the outer wall surface. Because it is formed by the arc wall part
It is possible to reduce the degree of concentration of residual stress of the pan at the corner portion, and cracks and peeling do not occur in the pan.
【００１７】第２の手段においては、鍋の底壁部の広さ
が周側壁部上端部の広さより小さく、該底壁部より周側
壁部上方へ上広がり状の傾斜部が形成され、底壁部と該
傾斜部とにかけてのコーナー部が円弧壁部により形成さ
れているから、鍋内部で加熱された水の対流が良くな
る。In the second means, the breadth of the bottom wall portion of the pan is smaller than the breadth of the upper end portion of the peripheral side wall portion, and the inclined portion is formed so as to extend upward from the bottom wall portion to the peripheral side wall portion. Since the corner portion between the wall portion and the inclined portion is formed by the arc wall portion, the convection of water heated in the pot is improved.
【００１８】第３の手段においては、誘導加熱コイルが
鍋の底壁部周縁を加熱する部位に設けられ、この誘導加
熱コイルと鍋の円弧壁部とが対応する位置関係にあるか
ら、鍋内部で加熱された水の対流が良くなる。この場
合、円弧壁部に、該誘導加熱コイルの繰返し加熱が作用
するが、該円弧壁部での亀裂や剥離を防止できるように
なる。In the third means, the induction heating coil is provided at a portion for heating the peripheral edge of the bottom wall of the pan, and the induction heating coil and the arc wall of the pan have a corresponding positional relationship. The convection of heated water is improved. In this case, repeated heating of the induction heating coil acts on the arc wall portion, but cracks and peeling at the arc wall portion can be prevented.
【００１９】第４の手段においては、傾斜部が、曲率半
径が０．５Ｄ以上の円弧壁状に形成されているから、鍋
内部で加熱された水の対流が良くなる。In the fourth means, since the inclined portion is formed in the shape of an arc wall having a radius of curvature of 0.5 D or more, the convection of water heated in the pot is improved.
【００２０】第５の手段においては、鍋の底壁部周縁か
ら周側壁部にかけてのコーナー部を、内壁面および外壁
面の曲率半径が１０［ｍｍ］以上となる円弧壁部により
形成したから、該コーナー部での鍋の残留応力の集中度
合いを軽減できるようになり、鍋に亀裂や剥離が発生す
ることがない。In the fifth means, since the corner portion from the peripheral edge of the bottom wall portion of the pot to the peripheral side wall portion is formed by the arcuate wall portion having the radius of curvature of the inner wall surface and the outer wall surface of 10 [mm] or more, It is possible to reduce the degree of concentration of residual stress of the pan at the corner portion, and cracks and peeling do not occur in the pan.
【００２１】第６の手段においては、鍋の熱伝導部が、
溶湯鍛造により形成されているから、誘導発熱部とこの
熱伝導部との密着性も良く、さらには、いわゆる巣の発
生も少なく、総じて熱伝導性に大いに優れる。In the sixth means, the heat conducting portion of the pan is
Since it is formed by molten metal forging, the adhesion between the induction heating portion and this heat conducting portion is good, and furthermore, the occurrence of so-called cavities is small, and the heat conductivity is generally excellent.
【００２２】[0022]
【実施例】以下、本発明の第１の実施例について図１な
いし図５を参照して説明する。まず全体構成を示す図３
において、樹脂製の炊飯器本体１は上部に蓋部２がヒン
ジ３により上方に開閉可能に配設されている。炊飯器本
体１の内部側には鍋４が収容可能な鍋収容部としての外
槽部５が形成されており、この外槽部５の底面直下には
外周部に対応して誘導加熱コイル６が、やや中央よりに
誘導加熱コイル６ａがそれぞれ配設され、それらの下部
には磁気回路を形成するためのフェライト７が配設され
ている。鍋４の上面開口部は蓋部２を閉じたときにその
内側に設けられた内蓋２ａにより閉塞されるようになっ
ており、また、蓋部２内部には内蓋２ａを介して鍋４内
部を加熱するための蓋ヒータ８が配設されている。な
お、誘導加熱コイル６と誘導加熱コイル６ａのうち外周
部側の誘導加熱コイル６の方が入力Ｗ数が高くなるよう
に設定されている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. First, FIG. 3 showing the overall configuration.
In the rice cooker body 1 made of resin, a lid portion 2 is provided on an upper portion of the rice cooker body 1 so as to be opened and closed by a hinge 3. An outer tub portion 5 is formed on the inner side of the rice cooker body 1 as a pot housing portion capable of housing the pot 4, and an induction heating coil 6 is provided immediately below the bottom surface of the outer tub portion 5 corresponding to the outer peripheral portion. However, the induction heating coils 6a are disposed slightly in the center, and the ferrite 7 for forming a magnetic circuit is disposed below them. The top opening of the pan 4 is closed by an inner lid 2a provided inside the lid 2 when the lid 2 is closed, and the pan 4 is placed inside the lid 2 via the inner lid 2a. A lid heater 8 for heating the inside is provided. The induction heating coil 6 and the induction heating coil 6a are set so that the induction heating coil 6 on the outer peripheral side has a higher input W number.
【００２３】また、外槽部５の底面中央部には鍋４の底
面部と接触するように温度センサ９が配設されており、
鍋４の温度を検知するようになっている。また、炊飯器
本体１の内底部には高周波電流を発生させるためのイン
バータ回路部１０が配設されると共に冷却ファン１１が
配設されている。炊飯器本体１内の前部側には制御回路
部１２および操作部１３が配設されている。操作部１３
には、炊飯器本体１の前面外部に露出するように操作ス
イッチや表示器が配設されている。また、炊飯器本体１
の内部には外槽部５の側壁を介して鍋４を加熱保温する
ための胴ヒータ１４が配設されている。A temperature sensor 9 is arranged at the center of the bottom of the outer tub 5 so as to come into contact with the bottom of the pot 4.
The temperature of the pan 4 is detected. Further, an inverter circuit unit 10 for generating a high frequency current is arranged on the inner bottom of the rice cooker body 1, and a cooling fan 11 is arranged. A control circuit unit 12 and an operation unit 13 are provided on the front side of the rice cooker body 1. Operation unit 13
The operation switch and the indicator are arranged so that they are exposed to the outside of the front surface of the rice cooker body 1. Also, the rice cooker body 1
A body heater 14 for heating and keeping the pot 4 warm is provided inside the container via the side wall of the outer tub portion 5.
【００２４】次に、図１に基づいて鍋４の構成について
詳述する。鍋４は、後述する溶湯鍛造と呼ばれる技術を
用いて形成されるもので、容器状の熱伝導部１５と、こ
の熱伝導部１５の外底面部から外周面部にかけて取着さ
れた誘導発熱部１６とから構成されている。誘導発熱部
１６はステンレスからなるもので、熱伝導部１５の下面
部および外周面部の所定高さまで設けられている。Next, the structure of the pan 4 will be described in detail with reference to FIG. The pot 4 is formed using a technique called molten metal forging, which will be described later, and includes a container-shaped heat conducting portion 15 and an induction heating portion 16 attached from the outer bottom surface portion to the outer peripheral surface portion of the heat conducting portion 15. It consists of and. The induction heating portion 16 is made of stainless steel and is provided up to a predetermined height on the lower surface portion and the outer peripheral surface portion of the heat conducting portion 15.
【００２５】図１および図２に示すように、この鍋４に
おいて、その底壁部４ａの広さが周側壁部４ｂ上端部の
広さより小さく、該底壁部４ａより周側壁部４ｂ上方へ
上広がり状の傾斜部４ｃが形成されている。該鍋４の底
壁部４ａ周縁から周側壁部４ｂにかけてのコーナー部１
７、この場合、底壁部４ａと該傾斜部４ｃとにかけての
コーナー部１７は、円弧壁部４ｄにより形成されてい
る。この円弧壁部４ｄは、鍋４の規定最高水位線Ｌｄ
（この炊飯器の最大炊飯米量に対応する水位線）での直
径寸法をＤとしたとき、内壁面および外壁面の曲率半径
Ｒが０．０５Ｄ以上となるように形成されている。この
実施例では、上記Ｄは２００［ｍｍ］であり、Ｒは１０
［ｍｍ］以上例えば２５［ｍｍ］に設定されている。こ
のとき、このコーナー部１７に局部的に上記０．０５Ｄ
以下の曲率半径となる部分があっても差し支えはないが
円弧壁部４ｄの円弧長Ｌｅは実質的に５［ｍｍ］以上で
あることが好ましい。As shown in FIGS. 1 and 2, in this pan 4, the width of the bottom wall portion 4a is smaller than the width of the upper end portion of the peripheral side wall portion 4b, and the bottom wall portion 4a is located above the peripheral side wall portion 4b. An upwardly sloping slope 4c is formed. Corner portion 1 from the peripheral edge of the bottom wall 4a of the pan 4 to the peripheral side wall 4b
7. In this case, the corner portion 17 extending from the bottom wall portion 4a to the inclined portion 4c is formed by the arc wall portion 4d. This arc wall 4d is the prescribed maximum water level line Ld of the pan 4.
When the diameter dimension at (water level line corresponding to the maximum amount of cooked rice in this rice cooker) is D, the radius of curvature R of the inner wall surface and the outer wall surface is 0.05 D or more. In this embodiment, D is 200 [mm] and R is 10
[Mm] or more, for example, is set to 25 [mm]. At this time, the above-mentioned 0.05D is locally applied to this corner portion 17.
Although there is no problem even if there is a portion having the following radius of curvature, it is preferable that the arc length Le of the arc wall portion 4d is substantially 5 [mm] or more.
【００２６】また、上記傾斜部４ｃは、若干湾曲してお
り、すなわち、曲率半径Ｒｃが０．５Ｄ以上（この実施
例では例えば２００［ｍｍ］）となる円弧壁状に形成さ
れている。図２に示すように、前記誘導加熱コイル６が
鍋４の底壁部４ａ周縁を加熱する部位に設けられてお
り、この誘導加熱コイル６と鍋４の円弧壁部４ｄとが対
応する関係にある。The inclined portion 4c is slightly curved, that is, is formed in an arc wall shape having a radius of curvature Rc of 0.5 D or more (in this embodiment, for example, 200 [mm]). As shown in FIG. 2, the induction heating coil 6 is provided at a portion for heating the peripheral edge of the bottom wall portion 4a of the pan 4, and the induction heating coil 6 and the arc wall portion 4d of the pan 4 have a corresponding relationship. is there.
【００２７】また、アルミニウムを主成分とする合金を
基材とした熱伝導体材料からなる熱伝導部１５は、溶湯
鍛造技術を用いて形成される。すなわち、図５に示すよ
うに、上述のようにして形成された誘導発熱部１６の内
側の面に亜鉛やアルミニウムなどの低融点材料をメッキ
等によりあらかじめ密着させておき、これを鍋４の外形
形状に対応した雌型Ｋにセットする。そして、この雌型
Ｋ内に溶融されたアルミニウムを主成分とする熱伝導体
材料を注ぎ、これに鍋４の内部形状に対応した雄型Ｍを
嵌合させて高圧で成形する。なお、上記雌型Ｋおよび雄
型Ｍにおける円弧壁部４ｄ成形部分は上記した曲率半径
Ｒが得られる形状となっていることはもちろんである。Further, the heat conducting portion 15 made of a heat conducting material having an alloy having aluminum as a main component as a base material is formed by using a molten metal forging technique. That is, as shown in FIG. 5, a low-melting-point material such as zinc or aluminum is preliminarily adhered to the inner surface of the induction heating portion 16 formed as described above by plating or the like, and the outer shape of the pan 4 is formed. Set it to the female mold K corresponding to the shape. Then, a molten heat conductor material containing aluminum as a main component is poured into the female mold K, and a male mold M corresponding to the inner shape of the pot 4 is fitted into this and molded at high pressure. It is needless to say that the arcuate wall portion 4d molded portions of the female mold K and the male mold M are shaped so as to obtain the radius of curvature R described above.
【００２８】この製造により、誘導発熱部１６の内側部
分にアルミニウム合金層による熱伝導部１５が形成さ
れ、誘導発熱部１６と熱伝導部１５との間にはステンレ
スとアルミニウムにより形成された低融点合金層が介在
されるようになる。これによって熱伝導部１５と誘導発
熱部１６との間を密着した状態に接合することができる
ので、両者の間の熱抵抗を小さくすることができ、また
いわゆる巣の発生も少ない。By this manufacturing, the heat conducting portion 15 made of an aluminum alloy layer is formed inside the induction heating portion 16, and a low melting point formed of stainless steel and aluminum is provided between the induction heating portion 16 and the heat conducting portion 15. The alloy layer comes to be interposed. As a result, the heat conducting portion 15 and the induction heating portion 16 can be joined in a state of being in close contact with each other, so that the thermal resistance between them can be reduced, and so-called nests are less likely to occur.
【００２９】また、上述した鍋４の製造時には、磁性材
料である誘導発熱部１６がほぼ１００℃程度の温度状態
であるのに対し、溶融した熱良導体材料（熱伝導部１
５）は８００℃といった高温度状態となり、この状態か
ら熱収縮するため大きな残留応力が発生する。特に、鍋
４の底壁部４ａ周縁から周側壁部４ｂにかけてのコーナ
ー部１７に残留応力の応力集中が起きる。しかし、この
コーナー部１７は、曲率Ｒが既述した０．０５Ｄ以上の
円弧壁部４ｄから構成されているので、鍋４がそのコー
ナー部１７で亀裂したり、あるいは熱伝導部１５と誘導
発熱部１６とが剥離したりすることはない。Further, when the above-mentioned pot 4 is manufactured, while the induction heating part 16 made of a magnetic material is in a temperature state of about 100 ° C., the molten good thermal conductor material (the heat conducting part 1) is used.
In the case of 5), the temperature is as high as 800 ° C., and heat shrinks from this state, so that a large residual stress occurs. Particularly, stress concentration of residual stress occurs in the corner portion 17 from the peripheral edge of the bottom wall portion 4a of the pan 4 to the peripheral side wall portion 4b. However, since the corner portion 17 is composed of the arcuate wall portion 4d having a curvature R of 0.05D or more, the pot 4 is cracked at the corner portion 17 or the heat conduction portion 15 and the induction heat generation. The part 16 does not peel off.
【００３０】図４は電気的構成を示すもので、制御回路
部１２は、マイクロコンピュータなどの制御回路を含ん
で構成されるもので、あらかじめ炊飯のための制御プロ
グラムが記憶されている。この制御回路部１２は、操作
部１３から操作信号を受けるように接続され、制御プロ
グラムを実行すると、操作部１３からの操作信号に応じ
てインバータ回路部１０に制御信号を出力するようにな
っている。インバータ回路部１０は与えられた制御信号
に応じて所定周波数の高周波電流を誘導加熱コイル６に
供給して鍋４に発熱動作を行なわせる。FIG. 4 shows an electrical configuration. The control circuit section 12 is configured to include a control circuit such as a microcomputer, and a control program for cooking rice is stored in advance. The control circuit unit 12 is connected to receive an operation signal from the operation unit 13, and when a control program is executed, the control circuit unit 12 outputs a control signal to the inverter circuit unit 10 in response to the operation signal from the operation unit 13. There is. The inverter circuit unit 10 supplies a high-frequency current of a predetermined frequency to the induction heating coil 6 in accordance with the applied control signal to cause the pan 4 to perform a heating operation.
【００３１】温度センサ９の出力端子は操作部１３を介
して制御回路部１２に接続されており、鍋４の温度検出
信号を制御回路部１２に与える。また、冷却ファン１
１，蓋ヒータ８および胴ヒータ１４はそれぞれ制御回路
部１２から与えられる駆動制御信号により通電制御され
るようになっている。The output terminal of the temperature sensor 9 is connected to the control circuit section 12 via the operating section 13 and supplies the temperature detection signal of the pan 4 to the control circuit section 12. Also, the cooling fan 1
1, the lid heater 8 and the body heater 14 are each energized and controlled by a drive control signal provided from the control circuit unit 12.
【００３２】次に、本実施例の作用について説明する。
鍋４内に所定量の米と水が収容され、操作部１３により
炊飯の実行を指令する操作が行われると、制御回路部１
２は炊飯プログラムを実行して炊飯動作を開始するよう
になる。インバータ回路部１０は、制御回路部１２から
制御信号が出力されると、所定の周波数の高周波電流を
誘導加熱コイル６，６ａに供給するようになる。Next, the operation of this embodiment will be described.
When a predetermined amount of rice and water are stored in the pan 4 and the operation unit 13 performs an operation to command the execution of rice cooking, the control circuit unit 1
2 starts the rice cooking operation by executing the rice cooking program. When the control signal is output from the control circuit unit 12, the inverter circuit unit 10 supplies a high frequency current of a predetermined frequency to the induction heating coils 6 and 6a.
【００３３】これにより、誘導加熱コイル６，６ａの周
囲に発生した磁束は、鍋４との間の空隙部，誘導発熱部
１６内部，鍋４との間の空隙部を通り、フェライト７内
を通るようになる。そして、誘導発熱部１６の表層部で
は磁束の変化に伴う誘導電流が発生してその抵抗損失に
よる発熱が起こり、鍋４自体が加熱される。As a result, the magnetic flux generated around the induction heating coils 6 and 6a passes through the space between the pan 4 and the induction heating part 16 and the space between the pan 4 and the ferrite 7. It will pass. Then, in the surface layer portion of the induction heating portion 16, an induction current is generated due to the change of the magnetic flux, and heat is generated due to the resistance loss, so that the pot 4 itself is heated.
【００３４】このとき、鍋４内には、温度むらの少ない
良好な対流が得られるようになる。すなわち、主たる誘
導加熱コイルであるところの入力が大きい誘導加熱コイ
ル６の加熱作用により鍋４の底壁部４ａ周縁、すなわち
円弧壁部４ｄから傾斜部４ｃにかけての部分が加熱され
る。このとき、この円弧壁部４ｄから傾斜部４ｃにおい
ては、その内面近傍の水が加熱されて真上への浮力が発
生する。また、その内面では水に対する粘着力も作用す
る。この粘着力はその内面に対して直角に作用する。At this time, good convection with little temperature unevenness can be obtained in the pan 4. That is, the peripheral portion of the bottom wall portion 4a of the pan 4, that is, the portion from the arc wall portion 4d to the inclined portion 4c is heated by the heating action of the induction heating coil 6, which is the main induction heating coil and has a large input. At this time, in the arcuate wall portion 4d to the inclined portion 4c, the water in the vicinity of the inner surface of the arc wall portion 4d is heated, and buoyancy is generated right above. Further, the adhesive force to water also acts on its inner surface. This adhesive force acts at right angles to its inner surface.
【００３５】この浮力と粘着力とが円弧壁部４ｄから傾
斜部４ｃにおいてバランスして、図２の破線Ｌで示すよ
うに、円弧壁部４ｄから傾斜部４ｃに沿って連続的に被
加熱水の強い上昇流が発生し、この結果、鍋４中央側で
上部の水が良好に下降するようになり、もって、被加熱
水が鍋４内部の周側壁部４ｂ内面側で上昇し中央側で下
降するといった良好な対流が発生するようになる。特
に、誘導加熱コイル６の内側に、誘導加熱コイル６ａを
離して設けたから、温度が若干低くなり勝ちな鍋４中央
部での温度を適正に高めることができ、鍋４内部の温度
均一化を図ることができるようになる。よって、全体を
温度むらなく均一な温度に加熱しながら炊飯，蒸らしお
よび保温等の加熱調理を行うことができ、米を全体に十
分にアルファ化して均一な炊飯を行うと共に、むらしに
おいてもコゲつき等が発生することもなくなる。The buoyancy and the adhesive force are balanced from the arc wall 4d to the inclined portion 4c, and as shown by the broken line L in FIG. 2, the water to be heated is continuously fed from the arc wall 4d to the inclined portion 4c. As a result, a strong upward flow of water is generated, and as a result, the water in the upper part of the pan 4 falls well, so that the heated water rises on the inner side of the peripheral side wall 4b inside the pan 4 and rises on the central side. Good convection such as descending will occur. In particular, since the induction heating coil 6a is provided separately inside the induction heating coil 6, the temperature in the central portion of the pot 4, which is apt to be slightly lowered, can be appropriately increased, and the temperature inside the pot 4 can be made uniform. You will be able to plan. Therefore, it is possible to cook rice, steam, and heat while heating the whole to a uniform temperature without unevenness in temperature. It also eliminates sticking.
【００３６】このような本実施例によれば、鍋４におけ
る熱伝導部１５が、溶融した熱良導体材料であるアルミ
ニウムが固化して容器状に形成され、且つこの熱伝導部
１５の外底面部から外周面部にかけて磁性材料であるス
テンレスからなる誘導発熱部１６が前記固化に伴い予め
取着されるから、クラッド材を鍋に使用した場合と違っ
て、鍋４の設計の自由度が高く、しかも誘導発熱部１６
も必要箇所に設けることが可能となり、熱的効率の向上
も図ることが可能となる。According to the present embodiment as described above, the heat conducting portion 15 of the pot 4 is formed into a container shape by solidifying molten aluminum which is a good heat conductor material, and the outer bottom surface portion of the heat conducting portion 15 is formed. Since the induction heating part 16 made of stainless steel, which is a magnetic material, is attached in advance from the outer peripheral surface to the outer peripheral part along with the solidification, unlike the case where the clad material is used for the pan, the pan 4 has a high degree of freedom in design, and Induction heating unit 16
Can also be provided at a required location, and thermal efficiency can be improved.
【００３７】また、前記鍋４の規定最高水位線Ｌｄでの
直径寸法をＤ（２００ｍｍ）としたとき、該鍋４の底壁
部４ａ周縁から周側壁部４ｂにかけてのコーナー部１７
を、内壁面および外壁面の曲率半径が０．０５Ｄ以上
（２５ｍｍ）である円弧壁部４ｄにより形成したから、
該コーナー部１７での鍋４の残留応力の集中度合いを軽
減できるようになり、鍋４に亀裂や剥離が発生すること
がない。特に、鍋４の大きさが変わると、コーナー部１
７での残留応力の集中度も変わるが、本実施例では上述
したように鍋４の大きさ（鍋４の規定最高水位線Ｌｄで
の直径寸法Ｄの大きさ）に応じて円弧壁部４ｄの曲率半
径も０．０５Ｄ以上となるから、確実に応力集中を軽減
できるものである。When the diameter of the pan 4 at the specified maximum water level line Ld is D (200 mm), the corner portion 17 extending from the peripheral edge of the bottom wall 4a to the peripheral side wall 4b of the pan 4 is used.
Is formed by the arcuate wall portion 4d in which the radius of curvature of the inner wall surface and the outer wall surface is 0.05 D or more (25 mm),
It is possible to reduce the degree of concentration of the residual stress of the pot 4 at the corner portion 17, so that the pot 4 is not cracked or peeled. Especially when the size of the pan 4 changes, the corner 1
Although the degree of concentration of residual stress at 7 also changes, in this embodiment, as described above, the arcuate wall 4d depends on the size of the pan 4 (the size of the diameter dimension D of the pan 4 at the specified maximum water level line Ld). Since the radius of curvature of is also 0.05 D or more, the stress concentration can be reliably reduced.
【００３８】特に本実施例においては、鍋４の底壁部４
ａの広さが周側壁部４ｂ上端部の広さより小さく、該底
壁部４ａより周側壁部４ｂ上方へ上広がり状の傾斜部４
ｃが形成され、底壁部４ａと該傾斜部４ｃとにかけての
コーナー部１７が円弧壁部１４ｄにより形成されている
から、鍋４内部で加熱された水の対流が良くなり、この
結果、全体を温度むらなく均一な温度に加熱することが
できる。Particularly in this embodiment, the bottom wall portion 4 of the pan 4 is
The width of a is smaller than the width of the upper end portion of the peripheral side wall portion 4b, and the inclined portion 4 is spread upward from the bottom wall portion 4a to the peripheral side wall portion 4b.
c is formed, and the corner portion 17 extending from the bottom wall portion 4a to the inclined portion 4c is formed by the arc wall portion 14d, the convection of the water heated in the pot 4 is improved, and as a result, the whole Can be heated to a uniform temperature without temperature unevenness.
【００３９】さらに、誘導加熱コイル６が鍋４の底壁部
４ａ周縁を加熱する部位に設けられ、この誘導加熱コイ
ル６と鍋の円弧壁部４ｄとが対応する位置関係にあるか
ら、鍋４内部で加熱された水の対流が良くなる。この場
合、円弧壁部４ｄに、該誘導加熱コイル６の繰返し加熱
が作用するが、該円弧壁部４ｄでの亀裂や剥離を防止で
きるようになる。また、傾斜部４ｃが、曲率半径Ｒｃが
０．５Ｄ以上（この場合２００ｍｍ）の円弧壁状に形成
されているから、これによっても鍋４内部で加熱された
水の対流が良くなる。Further, the induction heating coil 6 is provided at a portion for heating the peripheral edge of the bottom wall 4a of the pan 4, and the induction heating coil 6 and the arc wall 4d of the pan have a corresponding positional relationship. Better convection of water heated inside. In this case, the induction heating coil 6 is repeatedly heated on the arc wall portion 4d, but cracks and peeling on the arc wall portion 4d can be prevented. Further, since the inclined portion 4c is formed in the shape of an arc wall having a radius of curvature Rc of 0.5D or more (200 mm in this case), the convection of the water heated in the pot 4 is also improved.
【００４０】さらにまた、鍋４の熱伝導部１５が、溶湯
鍛造により形成されているから、誘導発熱部１６とこの
熱伝導部１５との密着性も良く、さらには、いわゆる巣
の発生も少なく、総じて熱伝導性に大いに優れ、加熱効
率が向上する。Furthermore, since the heat conducting portion 15 of the pot 4 is formed by molten metal forging, the adhesion between the induction heating portion 16 and this heat conducting portion 15 is good, and furthermore, so-called cavities are less likely to occur. In general, the thermal conductivity is very good and the heating efficiency is improved.
【００４１】次に、図６は本発明の第２の実施例を示し
ており、鍋２１の形状が異なる。すなわち、この鍋２１
は、有底ほぼ円筒形状に形成されており、上述した第１
の実施例の鍋４における傾斜部４ｃが無い構成である。
この鍋２１においても、該鍋２１の規定最高水位線Ｌｄ
での直径寸法をＤとしたとき、該鍋２１の底壁部２１ａ
周縁から周側壁部２１ｂにかけてのコーナー部２２を、
内壁面および外壁面の曲率半径Ｒが０．０５Ｄ以上とな
る円弧壁部２１ｃにより形成している。この実施例にお
いても、所期の目的は達成できる。Next, FIG. 6 shows a second embodiment of the present invention in which the shape of the pot 21 is different. That is, this pot 21
Is formed in a substantially cylindrical shape with a bottom,
It is the structure which does not have the inclined part 4c in the pan 4 of this embodiment.
Also in this pan 21, the prescribed maximum water level line Ld of the pan 21
The bottom wall portion 21a of the pan 21 is defined as the diameter dimension at D.
The corner portion 22 from the peripheral edge to the peripheral side wall portion 21b is
The inner wall surface and the outer wall surface are formed by arcuate wall portions 21c having a radius of curvature R of 0.05 D or more. Also in this embodiment, the intended purpose can be achieved.
【００４２】本発明の別の手段としては、次のようにし
ても良い。すなわち、鍋の底壁部周縁から周側壁部にか
けてのコーナー部を、鍋自体の大きさに関係なく一義的
に、内壁面および外壁面の曲率半径が１０［ｍｍ］以上
となる円弧壁部により形成するようにしても良い。つま
り、この種炊飯器に用いられる鍋は、その大きさが最小
クラスでもその規定最高水位線での直径寸法が２００
［ｍｍ］よりも小さいということはほとんどないから、
円弧壁部の内壁面および外壁面の曲率半径が１０［ｍ
ｍ］以上であれば、コーナー部での鍋の残留応力の集中
度合いを軽減できるようになり、鍋に亀裂や剥離が発生
することがない。Another means of the present invention may be as follows. That is, the corner portion from the peripheral edge of the bottom wall of the pot to the peripheral side wall is uniquely defined by an arc wall portion whose inner wall surface and outer wall surface have a radius of curvature of 10 mm or more regardless of the size of the pot itself. It may be formed. In other words, the pot used for this type of rice cooker has a diameter of 200 at the specified maximum water level line even if its size is the smallest.
It is almost never smaller than [mm],
The radius of curvature of the inner wall surface and the outer wall surface of the arc wall is 10 [m
m] or more, it becomes possible to reduce the degree of concentration of residual stress in the pot at the corners, and cracks and peeling do not occur in the pot.
【００４３】なお、本発明は上記各実施例に限定される
ものではなく、例えば、熱伝導部は溶湯鍛造でなくダイ
キャストや鋳造あるいは鍛造でも良い。また、誘導発熱
部は、熱伝導部の外底面部の全面に設ける必要はなく、
外底面部の中央部には無くても差し支えない。The present invention is not limited to the above-described embodiments, and for example, the heat conducting portion may be die cast, cast or forged instead of molten metal forging. In addition, the induction heating portion need not be provided on the entire outer bottom surface of the heat conducting portion,
It does not matter if it is not in the center of the outer bottom surface.
【００４４】[0044]
【発明の効果】本発明は以上の説明から明らかなよう
に、次の効果を得ることができる。請求項１の発明によ
れば、鍋における熱伝導部が、溶融した熱良導体材料が
固化して容器状に形成され、且つこの熱伝導部の外底面
部から外周面部にかけて磁性材料からなる誘導発熱部が
前記固化に伴い予め取着されるから、クラッド材を鍋に
使用した場合と違って、鍋の設計の自由度が高く、しか
も誘導発熱部も必要箇所に設けることが可能となり、熱
的効率の向上も図ることが可能となる。また、前記鍋の
規定最高水位線での直径寸法をＤとしたとき、該鍋の底
壁部周縁から周側壁部にかけてのコーナー部を、内壁面
および外壁面の曲率半径が０．０５Ｄ以上となる円弧壁
部により形成したから、鍋の大きさに左右されず該コー
ナー部での鍋の残留応力の集中度合いを軽減できるよう
になり、鍋に亀裂や剥離が発生することがない。As is apparent from the above description, the present invention can obtain the following effects. According to the invention of claim 1, the heat conducting portion in the pan is formed into a container by solidifying the molten good thermal conductor material, and the induction heat generated from the magnetic material extends from the outer bottom surface portion to the outer peripheral surface portion of the heat conducting portion. Since the part is attached in advance with the solidification, unlike the case where the clad material is used for the pan, there is a high degree of freedom in the design of the pan, and it is also possible to install the induction heating part at the necessary location, It is also possible to improve efficiency. When the diameter dimension of the pan at the prescribed maximum water level line is D, the corner portion from the peripheral edge of the bottom wall to the peripheral side wall has a radius of curvature of 0.05 D or more on the inner wall surface and the outer wall surface. Since it is formed by the circular arc wall portion, the degree of concentration of the residual stress of the pot at the corner portion can be reduced regardless of the size of the pot, and cracks and peeling do not occur in the pot.
【００４５】請求項２の発明によれば、鍋の底壁部の広
さが周側壁部上端部の広さより小さく、該底壁部より周
側壁部上方へ上広がり状の傾斜部が形成され、底壁部と
該傾斜部とにかけてのコーナー部が円弧壁部により形成
されているから、鍋内部で加熱された水の対流を良くし
得、鍋内部の米および水を均一加熱でき、よって、良好
な炊き上がりを得ることができる。According to the second aspect of the present invention, the breadth of the bottom wall portion of the pan is smaller than the breadth of the upper end portion of the peripheral side wall portion, and the inclined portion is formed so as to extend upward from the bottom wall portion to the peripheral side wall portion. Since the corner portion between the bottom wall portion and the inclined portion is formed by the arc wall portion, the convection of the water heated in the pot can be improved, and the rice and water in the pot can be uniformly heated. , You can get a good cooked.
【００４６】請求項３の発明によれば、誘導加熱コイル
が鍋の底壁部周縁を加熱する部位に設けられ、この誘導
加熱コイルと鍋の円弧壁部とが対応する位置関係にある
から、鍋内部で加熱された水の対流が良くなる。この場
合、円弧壁部に、該誘導加熱コイルの繰返し加熱が作用
するが、該円弧壁部での亀裂や剥離は既述したように防
止できる。According to the third aspect of the present invention, the induction heating coil is provided at a portion for heating the peripheral edge of the bottom wall of the pan, and the induction heating coil and the arc wall of the pan have a corresponding positional relationship. The convection of water heated inside the pot is improved. In this case, the induction heating coil is repeatedly heated on the circular arc wall portion, but cracks and peeling on the circular arc wall portion can be prevented as described above.
【００４７】請求項４の発明によれば、傾斜部が、曲率
半径が０．５Ｄ以上の円弧壁状に形成されているから、
鍋内部で加熱された水の対流がさらに良くなる。According to the invention of claim 4, since the inclined portion is formed in the shape of an arc wall having a radius of curvature of 0.5 D or more,
The convection of the water heated inside the pot is even better.
【００４８】請求項５の発明によれば、鍋の底壁部周縁
から周側壁部にかけてのコーナー部を、内壁面および外
壁面の曲率半径が１０［ｍｍ］以上となる円弧壁部によ
り形成したから、該コーナー部での鍋の残留応力の集中
度合いを軽減できるようになり、鍋に亀裂や剥離が発生
することがない。According to the invention of claim 5, the corner portion from the peripheral edge portion of the bottom wall portion of the pot to the peripheral side wall portion is formed by the circular arc wall portion having the radius of curvature of the inner wall surface and the outer wall surface of 10 [mm] or more. Therefore, the degree of concentration of the residual stress of the pot at the corner can be reduced, and the pot is not cracked or peeled.
【００４９】請求項６の発明によれば、鍋の熱伝導部
が、溶湯鍛造により形成されているから、誘導発熱部と
この熱伝導部との密着性も良く、さらには、いわゆる巣
の発生も少なく、総じて熱伝導性に大いに優れたものと
なり、加熱効率が高くなる。According to the invention of claim 6, since the heat conducting portion of the pot is formed by molten metal forging, the induction heat generating portion and the heat conducting portion are well adhered to each other, and further, so-called nest formation occurs. In addition, the heat conductivity is generally excellent and the heating efficiency is high.
【図１】本発明の第１の実施例を示す鍋の縦断側面図FIG. 1 is a vertical sectional side view of a pot showing a first embodiment of the present invention.
【図２】鍋と誘導加熱コイルとの配置関係を示す縦断側
面図FIG. 2 is a vertical sectional side view showing a positional relationship between the pan and the induction heating coil.
【図３】炊飯器の縦断側面図[Figure 3] Vertical side view of rice cooker
【図４】電気的構成を示す回路図FIG. 4 is a circuit diagram showing an electrical configuration.
【図５】溶湯鍛造技術による鍋の製造工程を示す縦断側
面図[FIG. 5] A vertical sectional side view showing a manufacturing process of a pot by a molten metal forging technique.
【図６】本発明の第２の実施例を示す鍋の縦断側面図FIG. 6 is a vertical sectional side view of a pot showing a second embodiment of the present invention.
１は炊飯器本体、４は鍋、４ａは底壁部、４ｂは周側壁
部、４ｃは傾斜部、４ｄは円弧壁部、５は外槽部、６，
６ａは誘導加熱コイル、７はフェライト、１０はインバ
ータ回路、１２は制御回路部、１３は操作部、１５は鍋
基体、１６は誘導発熱部、１７はコーナー部、２１は
鍋、２１ａは底壁部、２１ｂは周側壁部、２１ｃは円弧
壁部、２２はコーナー部を示す。1 is a rice cooker body, 4 is a pan, 4a is a bottom wall portion, 4b is a peripheral side wall portion, 4c is an inclined portion, 4d is an arc wall portion, 5 is an outer tank portion, 6,
6a is an induction heating coil, 7 is a ferrite, 10 is an inverter circuit, 12 is a control circuit part, 13 is an operating part, 15 is a pot base, 16 is an induction heating part, 17 is a corner part, 21 is a pan, and 21a is a bottom wall. 21b is a peripheral side wall, 21c is an arcuate wall, and 22 is a corner.
Claims (6)
の熱伝導部が形成され、且つこの熱伝導部の外底面部か
ら外周面部にかけて磁性材料からなる誘導発熱部が前記
固化に伴い予め取着されてなる鍋と、 この鍋の外方に配置された誘導加熱コイルとを備え、 前記鍋の規定最高水位線での直径寸法をＤとしたとき、
該鍋の底壁部周縁から周側壁部にかけてのコーナー部
を、内壁面および外壁面の曲率半径が０．０５Ｄ以上と
なる円弧壁部により形成したことを特徴とする炊飯器。1. A molten heat-conductive material is solidified to form a container-shaped heat conducting portion, and an induction heating portion made of a magnetic material is formed in advance from the outer bottom surface portion to the outer peripheral surface portion of the heat conducting portion along with the solidification. When the pan is attached and the induction heating coil is arranged outside the pan, and the diameter dimension at the specified maximum water level line of the pan is D,
A rice cooker characterized in that a corner portion from the peripheral edge of the bottom wall portion of the pot to the peripheral side wall portion is formed by a circular arc wall portion having a radius of curvature of 0.05 D or more on the inner wall surface and the outer wall surface.
広さより小さく、該底壁部より周側壁部上方へ上広がり
状の傾斜部が形成され、底壁部と該傾斜部とにかけての
コーナー部が円弧壁部により形成されていることを特徴
とする請求項１記載の炊飯器。2. The pan has a bottom wall portion having a width smaller than that of an upper end portion of the peripheral side wall portion, and an inclined portion extending upward from the bottom wall portion to the peripheral side wall portion is formed. The rice cooker according to claim 1, wherein a corner portion extending to the inclined portion is formed by an arc wall portion.
する部位に設けられ、この誘導加熱コイルと鍋の円弧壁
部とが対応する位置関係にあることを特徴とする請求項
１記載の炊飯器。3. The induction heating coil is provided at a portion for heating the peripheral edge of the bottom wall of the pan, and the induction heating coil and the arc wall of the pan have a corresponding positional relationship. Rice cooker.
壁状に形成されていることを特徴とする請求項２記載の
炊飯器。4. The rice cooker according to claim 2, wherein the inclined portion is formed in an arc wall shape having a radius of curvature of 0.5 D or more.
の熱伝導部が形成され、且つこの熱伝導部の外底面部か
ら外周面部にかけて磁性材料からなる誘導発熱部が前記
固化に伴い予め取着されてなる鍋と、 この鍋の外方に配置された誘導加熱コイルとを備え、 前記鍋の底壁部周縁から周側壁部にかけてのコーナー部
を、内壁面および外壁面の曲率半径が１０［ｍｍ］以上
となる円弧壁部により形成したことを特徴とする炊飯
器。5. The molten good thermal conductor material is solidified to form a container-shaped heat conducting portion, and an induction heating portion made of a magnetic material is formed in advance from the outer bottom surface portion to the outer peripheral surface portion of the heat conducting portion along with the solidification. It is equipped with a pot that is attached and an induction heating coil that is arranged outside the pot, and the corner portion from the peripheral edge of the bottom wall to the peripheral side wall of the pot has a radius of curvature of the inner wall surface and the outer wall surface. A rice cooker characterized by being formed by an arc wall portion of 10 [mm] or more.
れていることを特徴とする請求項１または５記載の炊飯
器。6. The rice cooker according to claim 1 or 5, wherein the heat conducting portion of the pan is formed by molten metal forging.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19299794A JP2908705B2 (en) | 1994-08-17 | 1994-08-17 | rice cooker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19299794A JP2908705B2 (en) | 1994-08-17 | 1994-08-17 | rice cooker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0852064A true JPH0852064A (en) | 1996-02-27 |
| JP2908705B2 JP2908705B2 (en) | 1999-06-21 |
Family
ID=16300505
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19299794A Expired - Fee Related JP2908705B2 (en) | 1994-08-17 | 1994-08-17 | rice cooker |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2908705B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008259556A (en) * | 2007-04-10 | 2008-10-30 | Tiger Vacuum Bottle Co Ltd | Electric rice cooker |
| JP2009011718A (en) * | 2007-07-09 | 2009-01-22 | Mitsubishi Electric Corp | Inner pot of rice cooker and rice cooker having the inner pot |
| CN103070616A (en) * | 2013-01-31 | 2013-05-01 | 浙江苏泊尔家电制造有限公司 | Pot liner and electric cooker with same |
| JP2013192838A (en) * | 2012-03-22 | 2013-09-30 | Panasonic Corp | Induction heating rice cooker |
| CN105877502A (en) * | 2016-03-17 | 2016-08-24 | 九阳股份有限公司 | High-strength cooker inner container and electric cooker using same |
| CN109199125A (en) * | 2017-07-07 | 2019-01-15 | 浙江苏泊尔家电制造有限公司 | Interior pot, electric cooker and electric pressure cooking saucepan |
-
1994
- 1994-08-17 JP JP19299794A patent/JP2908705B2/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008259556A (en) * | 2007-04-10 | 2008-10-30 | Tiger Vacuum Bottle Co Ltd | Electric rice cooker |
| JP2009011718A (en) * | 2007-07-09 | 2009-01-22 | Mitsubishi Electric Corp | Inner pot of rice cooker and rice cooker having the inner pot |
| JP2013192838A (en) * | 2012-03-22 | 2013-09-30 | Panasonic Corp | Induction heating rice cooker |
| CN103070616A (en) * | 2013-01-31 | 2013-05-01 | 浙江苏泊尔家电制造有限公司 | Pot liner and electric cooker with same |
| WO2014117678A1 (en) * | 2013-01-31 | 2014-08-07 | Zhejiang Supor Electrical Appliances Manufacturing Co., Ltd | Inner pot and rice cooker having the same |
| CN105877502A (en) * | 2016-03-17 | 2016-08-24 | 九阳股份有限公司 | High-strength cooker inner container and electric cooker using same |
| CN109199125A (en) * | 2017-07-07 | 2019-01-15 | 浙江苏泊尔家电制造有限公司 | Interior pot, electric cooker and electric pressure cooking saucepan |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2908705B2 (en) | 1999-06-21 |
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