JPH07184768A - Rice cooker - Google Patents
Rice cookerInfo
- Publication number
- JPH07184768A JPH07184768A JP6136791A JP13679194A JPH07184768A JP H07184768 A JPH07184768 A JP H07184768A JP 6136791 A JP6136791 A JP 6136791A JP 13679194 A JP13679194 A JP 13679194A JP H07184768 A JPH07184768 A JP H07184768A
- Authority
- JP
- Japan
- Prior art keywords
- induction heating
- heat
- pan
- heating coil
- heat conducting
- 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
Classifications
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J27/00—Cooking-vessels
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- 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は、例え
ば、図１０に示すように、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
ル圧接したクラッド材を、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たも
のを用いている。これにより、鍋１は、外面が誘導発熱
部２により覆われ、内面が熱伝導部３により覆われた状
態に形成される。2. Description of the Related Art For example, as shown in FIG. 10, a pot used for this type of rice cooker is made of a clad material in which aluminum having good heat conduction characteristics and magnetic stainless steel which is a magnetic material are rolled and pressure-bonded in a flat plate state. A cylindrical container having magnetic stainless steel disposed outside is formed by drawing. As a result, the pot 1 is formed such that the outer surface is covered with the induction heating portion 2 and the inner surface is covered with the heat conducting portion 3.
【０００３】そして、２つの誘導加熱コイル４および５
を鍋１の底面部中央および周辺部にそれぞれ設け、これ
らの誘導加熱コイル４，５に高周波電流を通電すること
により、鍋１の誘導発熱部２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
４を介して鍋１の全体に渡って伝導させて鍋１内部を加
熱するようにしたものである。And two induction heating coils 4 and 5
Are provided at the center and the periphery of the bottom of the pot 1, and by applying a high-frequency current to these induction heating coils 4 and 5, an induction current is generated in the induction heating section 2 of the pot 1 and heat is generated due to its resistance loss. At the same time, the heat is conducted to the entire pot 1 via the heat conducting portion 4 to heat the inside of the pot 1.
【０００４】したがって、鍋１に収容された水と米は誘
導発熱部２から熱伝導部３に伝達された熱により全体が
加熱調理されるようになる。そして、加熱調理が進んで
鍋１内の水分が蒸発するのを図示しないセンサなどによ
り検出すると、誘導加熱コイル４，５による通電を減少
させて、鍋１内部の飯が焦げない程度に通電した状態で
１００℃近くの高温に保つように通電する。また、炊飯
後の保温状態においては、誘導加熱コイル４，５だけで
はなく、鍋１の蓋に設けたヒータや、鍋の胴部近傍に設
けた胴ヒータ（いずれも図示せず）によっても加熱を行
い、このときには例えば約７０℃程度に保つように通電
するようになっている。Therefore, the water and rice contained in the pan 1 are cooked as a whole by the heat transferred from the induction heating section 2 to the heat conducting section 3. Then, when it is detected that the water in the pan 1 evaporates due to the progress of cooking by a sensor (not shown), the induction heating coils 4 and 5 are de-energized to energize the rice in the pan 1 without burning. In this state, energize so as to maintain a high temperature near 100 ° C. In addition, in the heat retention state after cooking rice, heating is performed not only by the induction heating coils 4 and 5, but also by a heater provided on the lid of the pot 1 or a body heater provided near the body of the pot (neither is shown). At this time, the power is supplied so that the temperature is maintained at about 70 ° C., for example.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、上述の
ような従来構成のものでは、次のような不具合がある。
すなわち、まず、誘導発熱部２としての磁性ステンレス
の熱伝導率は０．０６２（ｃａｌ／ｃｍ・ｓｅｃ・℃）
程度であり、一方、熱伝導部３としてのアルミニウムの
熱伝導率は０．５３（ｃａｌ／ｃｍ・ｓｅｃ・℃）程度
であるから、誘導発熱部２は、熱伝導部３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。However, the conventional structure as described above has the following problems.
That is, first, the thermal conductivity of the magnetic stainless steel as the induction heating portion 2 is 0.062 (cal / cm · sec · ° C).
On the other hand, since the heat conductivity of aluminum as the heat conducting portion 3 is about 0.53 (cal / cm · sec · ° C.), the heat generated by the induction heating portion 2 is higher than that of the heat conducting portion 3. The magnitude of conductivity is about 1 / 8.5, which means that it hardly contributes to heat transfer. Furthermore, magnetic stainless steel has a heat capacity per unit volume of 0.85 (cal / ° C).
・ Cm 3 ) is about 0.59 of aluminum
Compared with a value of about (cal / ° C · cm 3 ), the thermal efficiency becomes poor.
【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２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１を構成するのにクラッド材を用いているため、鍋１
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 materials, the induction heating part 2 made of magnetic stainless steel loses heat by the amount of its own heat capacity. However,
Since the clad material is used to construct the pot 1, the pot 1
There is no choice but to make it entirely surrounded by magnetic stainless steel,
As a result, there is a problem that the thermal efficiency is reduced as a whole.
【０００７】一方、熱伝導性を向上させるために、アル
ミニウムの部分の板厚を増すことは、その分だけさらに
熱容量が増加することになり、全体としての熱効率が悪
くなると共に、鍋１の重量が増加することになって使い
勝手が悪くなってしまう不具合がある。On the other hand, if the plate thickness of the aluminum part is increased to improve the thermal conductivity, the heat capacity is further increased by that amount, and the thermal efficiency as a whole is deteriorated, and the weight of the pan 1 is reduced. However, there is a problem that the usability will be worsened due to the increase of
【０００８】本発明は、上記事情に鑑みてなされたもの
でその目的は、誘導電流による発熱効率および全体の熱
伝達効率を高めて、加熱調理に対する熱効率が良く、し
かも軽量化を図ることができる鍋を実現できるようにし
た炊飯器を提供することにある。The present invention has been made in view of the above circumstances, and an object thereof is to improve heat generation efficiency due to an induced current and overall heat transfer efficiency so that the heat efficiency for heating and cooking is good and the weight can be reduced. It is to provide a rice cooker that can realize a pan.
【０００９】[0009]
【課題を解決するための手段】本発明の炊飯器は、上記
目的を達成するために、熱良導体材料からなる容器状の
熱伝導部の外面部に磁性材料からなる誘導発熱部を設け
てなる鍋と、この鍋の底面周縁部分と対応した位置にそ
の鍋と所定間隙を存した状態で配置された誘導加熱コイ
ルとを設け、前記鍋は、前記誘導発熱部を前記誘導加熱
コイルに対応した形状に形成し、且つ前記熱伝導部を溶
融状態の前記熱良導体材料を成形することにより形成し
ているところに特徴を有する。In order to achieve the above-mentioned object, the rice cooker of the present invention is provided with an induction heat generating portion made of a magnetic material on the outer surface of a container-like heat conducting portion made of a good thermal conductor material. A pot and an induction heating coil arranged at a position corresponding to the peripheral portion of the bottom surface of the pot with a predetermined gap therebetween are provided, and the pot has the induction heating section corresponding to the induction heating coil. It is characterized in that it is formed in a shape and the heat conducting portion is formed by molding the heat conductive material in a molten state.
【００１０】また、鍋を構成する発熱部と熱伝導部との
間に低融点合金層を介在させて構成すると良い。Further, it is preferable that a low melting point alloy layer is interposed between the heat generating portion and the heat conducting portion forming the pot.
【００１１】さらに、鍋を、誘導発熱部と熱伝導部との
間に複合金属層を形成する構成とし、前記複合金属層
を、前記誘導発熱部の内面側に一体に形成された微細な
凹凸を有する磁性材料層の凹部内に前記熱伝導部の成形
時に溶融状態の熱良導体が流入することにより形成する
構成とすることもできる。Further, the pot is constructed such that a composite metal layer is formed between the induction heating part and the heat conducting part, and the composite metal layer is formed on the inner surface side of the induction heating part so as to form fine irregularities. It is also possible to adopt a configuration in which a good thermal conductor in a molten state flows into the concave portion of the magnetic material layer having the above-mentioned when the heat conducting portion is molded.
【００１２】そして、誘導発熱部の磁性材料層を、磁性
材料の微粒子を塗布した状態で焼結することにより得ら
れる金属焼結層としても良い。Further, the magnetic material layer of the induction heating portion may be a metal sintered layer obtained by sintering the magnetic material in the state of being coated with fine particles.
【００１３】また、鍋の発熱部を、誘導加熱コイルの側
面上端部の位置から少なくともその誘導加熱コイルとの
間の寸法よりも高い位置まで配設されるように形成する
ことが好ましい。Further, it is preferable that the heating portion of the pan is formed so as to be arranged from the position of the upper end portion of the side surface of the induction heating coil to a position higher than at least the dimension between the induction heating coil and the induction heating coil.
【００１４】[0014]
【作用】請求項１記載の炊飯器によれば、誘導加熱コイ
ルに高周波電流が供給されると、これにより発生する磁
束が鍋との間隙を介して鍋の誘導発熱部に通るようにな
り、磁束の変化により生ずる誘導電流が流れてそのとき
の抵抗損失で発熱するようになる。誘導発熱部で発生し
た熱は熱伝導率が大きい熱伝導部に伝達されると、その
内部を通って鍋全体に熱がまわるようになり、鍋内の被
加熱物に対する均一な加熱状態を得ることができる。According to the rice cooker of the first aspect, when a high-frequency current is supplied to the induction heating coil, the magnetic flux generated thereby passes through the induction heating portion of the pan through the gap with the pan. An induced current generated by the change in magnetic flux flows and heat is generated due to resistance loss at that time. When the heat generated in the induction heating part is transferred to the heat conducting part, which has a high thermal conductivity, the heat goes around the whole pot through the inside, and a uniform heating state for the object to be heated in the pot is obtained. be able to.
【００１５】この場合、発熱に必要な誘導発熱部を誘導
加熱コイルに対応する部分に設けるために、誘導発熱部
に対して内部側に設けられる熱伝導部を溶融した熱良導
体材料を成形するといった溶湯鍛造技術等を用いて形成
しているので、例えば、鍋の側壁部分上方の誘導発熱動
作に寄与しない部分には誘導発熱部を設けない構成とす
ることができ、さらには、熱伝導部を熱伝導の条件に応
じて肉厚寸法に分布を持たせるなどの構成として良好な
熱伝導特性を持たせることができるので、上述のように
鍋全体に均一に熱を伝達させることができるのである。In this case, in order to provide the induction heating portion required for heat generation in the portion corresponding to the induction heating coil, the heat conducting portion provided on the inner side of the induction heating portion is formed by melting a good heat conductive material. Since it is formed by using the molten metal forging technology, for example, it is possible to provide a configuration in which the induction heating portion is not provided in a portion above the side wall portion of the pot that does not contribute to the induction heating operation. Good heat conduction characteristics can be provided as a configuration such as distribution of wall thickness according to the condition of heat conduction, so that heat can be uniformly transmitted to the entire pan as described above. .
【００１６】請求項２記載の炊飯器によれば、誘導発熱
部と熱伝導部との間に低融点合金層を介在させる構成と
しているので、例えば熱伝導部を形成する際に冷却時に
温度差によって誘導発熱部との間に隙間が発生しやすい
状態であっても、これらの間を低融点合金層を介在させ
ることによりそれらの間の密着性を良好に保持すること
ができるので、誘導発熱部により発生された熱を効率良
く熱伝導部に伝達させることができる。According to the rice cooker of the second aspect, since the low melting point alloy layer is interposed between the induction heating portion and the heat conducting portion, for example, when forming the heat conducting portion, there is a temperature difference during cooling. Even if a gap is likely to be generated between the induction heating part and the induction heating part, the low melting point alloy layer is interposed between them to maintain good adhesion between them. The heat generated by the section can be efficiently transmitted to the heat conducting section.
【００１７】請求項３記載の炊飯器によれば、誘導発熱
部と熱伝導部との間に設けられた複合金属層は、誘導発
熱部の内面側に一体に形成された磁性材料層の凹部内に
熱良導体が入り込んだ状態に形成されているので、誘導
発熱部と熱伝導部との間の密着性を高めることができる
ので、誘導発熱部により発生された熱を効率良く熱伝導
部に伝達させることができる。According to the third aspect of the rice cooker, the composite metal layer provided between the induction heating part and the heat conducting part is a recess of the magnetic material layer integrally formed on the inner surface side of the induction heating part. Since a good thermal conductor is formed inside, it is possible to enhance the adhesion between the induction heating part and the heat conducting part, so that the heat generated by the induction heating part can be efficiently transferred to the heat conducting part. Can be transmitted.
【００１８】請求項４記載の炊飯器によれば、磁性材料
層を、磁性材料の微粒子を誘導発熱部の内面側に塗布し
た状態で焼結させることにより形成した金属焼結層とし
ているので、簡単な構成としながら、誘導発熱部と熱伝
導部との間の密着性を向上させる構成を得ることができ
る。According to the rice cooker of the fourth aspect, the magnetic material layer is a metal sintered layer formed by sintering fine particles of the magnetic material applied to the inner surface side of the induction heating portion. It is possible to obtain a structure that improves the adhesion between the induction heating part and the heat conducting part while having a simple structure.
【００１９】請求項５記載の炊飯器によれば、誘導加熱
コイルにより発生される磁束は、鍋との間の空隙部分を
介して鍋側に広がる、対向する鍋の部分に誘導発熱部が
配置されているので、その磁束は磁性体材料製の誘導発
熱部に通り易くなっている。そして、この場合に、誘導
発熱部の上端部の位置が誘導加熱コイルの上端部の位置
から、鍋と誘導発熱部との間の間隔距離よりも高く設定
されているので、上述の磁束が熱伝導部に通ることがほ
とんどなくなる。つまり、熱伝導部側に磁束が漏れて誘
導加熱コイルのインピーダンスが低下するのを防止して
誘導発熱部による発熱の効率低下を防止することができ
るので、誘導発熱部による効率的な発熱動作を行なわせ
ることができる。According to the rice cooker of the fifth aspect, the magnetic flux generated by the induction heating coil spreads to the pot side through the gap between the cooker and the induction heating section. Therefore, the magnetic flux easily passes through the induction heating portion made of a magnetic material. And in this case, since the position of the upper end of the induction heating part is set higher than the distance between the pan and the induction heating part from the position of the upper end of the induction heating coil, It rarely passes through the conductive part. In other words, it is possible to prevent the magnetic flux from leaking to the heat conducting portion side and reduce the impedance of the induction heating coil to prevent the efficiency of the heat generation by the induction heating portion from being lowered. Can be done.
【００２０】[0020]
【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７を参照して説明する。全体構成を示す図２にお
いて、樹脂製の炊飯器本体１１は上部に蓋部１２がヒン
ジ１３により上方に開閉可能に配設されている。炊飯器
本体１１の内部側には鍋１４が収容可能な外槽部１５が
形成されており、この外槽部１５の底面直下には外周部
に対応して誘導加熱コイル１６が配設され、その下部に
は磁気回路を形成するためのフェライト１７が配設され
ている。鍋１４の上面開口部は蓋部１２を閉じたときに
その内側に設けられた内蓋１２ａにより閉塞されるよう
になっており、また、蓋部１２内部には内蓋１２ａを介
して鍋１４内部を加熱するための蓋ヒータ１８が配設さ
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. In FIG. 2 showing the overall configuration, a lid part 12 is provided on an upper portion of a rice cooker body 11 made of resin so as to be opened and closed upward by a hinge 13. An outer tub portion 15 capable of accommodating the pan 14 is formed on the inner side of the rice cooker main body 11, and an induction heating coil 16 is disposed immediately below the bottom surface of the outer tub portion 15 so as to correspond to the outer peripheral portion, A ferrite 17 for forming a magnetic circuit is disposed below the ferrite. The upper opening of the pan 14 is closed by an inner lid 12a provided inside the lid 12 when the lid 12 is closed, and the pan 12 is placed inside the lid 12 via the inner lid 12a. A lid heater 18 for heating the inside is provided.
【００２１】また、外槽部１５の底面中央部には鍋１４
の底面部と接触するように温度センサ１９が配設されて
おり、鍋１４の温度を検知するようになっている。ま
た、炊飯器本体１１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２０が配設されると共に冷却
ファン２１が配設されている。炊飯器本体１１内の前部
側には制御回路部２２および操作部２３が配設されてい
る。操作部２３には、炊飯器本体１１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１１の内部には外槽部１５の側壁を介し
て鍋１４を加熱保温するための胴ヒータ２４が配設され
ている。The pot 14 is provided at the center of the bottom of the outer tub 15.
A temperature sensor 19 is provided so as to come into contact with the bottom surface of the pot, and detects the temperature of the pot 14. In addition, an inverter circuit section 20 for generating a high frequency current is arranged on the inner bottom portion of the rice cooker main body 11 and a cooling fan 21 is arranged. A control circuit unit 22 and an operation unit 23 are provided on the front side of the rice cooker body 11. The operation section 23 is provided with operation switches and indicators so as to be exposed to the outside of the front surface of the rice cooker body 11. Further, a body heater 24 for heating and keeping the pot 14 warm is provided inside the rice cooker body 11 via the side wall of the outer tub portion 15.
【００２２】次に、図１に基づいて鍋１４および誘導加
熱コイル１６の構成について詳述する。鍋１４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、誘導発熱部２５，低融点合金層２６および熱伝導部
２７から構成されている。誘導発熱部２５は磁性ステン
レスや鋼板等の磁性材料からなるもので、鍋１４の下面
部および側壁部の所定高さまで設けられている。このと
き、誘導発熱部２５の高さ寸法は、対向している誘導加
熱コイル１６の上端部よりも寸法Δｈだけ高く位置する
ように設定されている。そして、この寸法Δｈは鍋１４
と誘導加熱コイル１６との間の空間部Ｇの間隙寸法ｇよ
りも少し大きい寸法として設定される（図５も参照）。Next, the configurations of the pan 14 and the induction heating coil 16 will be described in detail with reference to FIG. The pot 14 is formed using a technique called molten metal forging, which will be described later, and includes an induction heating portion 25, a low melting point alloy layer 26, and a heat conducting portion 27. The induction heating portion 25 is made of a magnetic material such as magnetic stainless steel or a steel plate, and is provided up to a predetermined height on the lower surface portion and side wall portion of the pot 14. At this time, the height dimension of the induction heating portion 25 is set to be higher than the upper end portion of the induction heating coil 16 facing it by a dimension Δh. And this dimension Δh is the pot 14
It is set as a dimension slightly larger than the gap dimension g of the space G between the induction heating coil 16 and the induction heating coil 16 (see also FIG. 5).
【００２３】ここで、鍋１４の誘導発熱部２５の高さ寸
法を上述のように設定しているのは、それよりも上部側
に磁性材料を設けても誘導発熱に寄与することがなく、
高価な磁性ステンレスの使用量を削減すると共に、全体
の重量を軽量化するためであり、このような構成とする
ためには、従来のようなクラッド材を用いるものでは実
現し得ないものである。Here, the height dimension of the induction heating portion 25 of the pan 14 is set as described above, even if a magnetic material is provided above the induction heating portion 25, it does not contribute to induction heating.
This is to reduce the amount of expensive magnetic stainless steel used and to reduce the overall weight, and such a structure cannot be realized by using a conventional clad material. .
【００２４】また、アルミニウム合金等の熱良導体材料
からなる熱伝導部２７は、溶湯鍛造技術を用いて形成さ
れる。すなわち、図７に示すように、上述のようにして
形成された誘導発熱部２５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１４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
ミニウムを注ぎ、これに鍋１４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。The heat conducting portion 27 made of a heat conductive material such as an aluminum alloy is formed by using a molten metal forging technique. That is, as shown in FIG. 7, a low-melting-point material such as zinc or aluminum is preliminarily adhered to the inner surface of the induction heating portion 25 formed as described above by plating, etc. Female type K corresponding to the shape
Set to. Then, the molten aluminum is poured into the female mold K, and the male mold M corresponding to the inner shape of the pan 14 is fitted into the molten aluminum and molded at high pressure.
【００２５】これにより、誘導発熱部２５の内側部分に
アルミニウム合金層による熱伝導部２７が形成され、誘
導発熱部２５と熱伝導部２７との間には磁性体とアルミ
ニウムにより形成された低融点合金層２６が介在される
ようになる（図３参照）。この低融点合金層２６は、誘
導発熱部２５と熱伝導部２７との間を完全に接合する状
態と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、単に両者を鋳くるむ場合に発生するよ
うな異種金属間での隙間の発生をなくすことができる。As a result, a heat conducting portion 27 made of an aluminum alloy layer is formed inside the induction heating portion 25, and a low melting point formed of a magnetic material and aluminum is provided between the induction heating portion 25 and the heat conducting portion 27. The alloy layer 26 comes to be interposed (see FIG. 3). Since the low melting point alloy layer 26 can completely bond the induction heating portion 25 and the heat conducting portion 27, it is possible to reduce the thermal resistance between them and to simply cast them. It is possible to eliminate the formation of a gap between different kinds of metals, which occurs when wrapped.
【００２６】なお、熱伝導部２７は底面部が厚肉に形成
されると共に、その誘導加熱コイル１６に対応する部分
が特に厚肉に形成され、側壁部の上方に向かうに従って
徐々に厚さが薄くなるように形成され、さらに、上部開
口部付近の被調理物と接触しない部分は薄肉に形成され
ており、後述するように加熱調理に対する熱伝達効率の
向上が図られた形状とされている。The bottom surface of the heat conducting portion 27 is formed thick, and the portion corresponding to the induction heating coil 16 is formed particularly thick so that the thickness gradually increases toward the upper side wall portion. It is formed to be thin, and the portion near the upper opening that does not come into contact with the object to be cooked is thin, and has a shape that improves the heat transfer efficiency for cooking as described later. .
【００２７】図４は電気的構成を示すもので、制御回路
部２２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２２は、操作
部２３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２３からの操作信号に応じ
てインバータ回路部２０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２０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１６
に供給して鍋１４に発熱動作を行なわせる。FIG. 4 shows an electrical configuration. The control circuit section 22 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 22 is connected so as to receive an operation signal from the operation unit 23, and when the control program is executed, the control circuit unit 22 outputs the control signal to the inverter circuit unit 20 according to the operation signal from the operation unit 23. There is. The inverter circuit unit 20 supplies the induction heating coil 16 with a high frequency current of a predetermined frequency according to the applied control signal.
To heat the pot 14 to generate heat.
【００２８】温度センサ１９の出力端子は操作部２３を
介して制御回路部２２に接続されており、鍋１４の温度
検出信号を制御回路部２２に与える。また、冷却ファン
２１，蓋ヒータ１８および胴ヒータ２４はそれぞれ制御
回路部２２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 19 is connected to the control circuit section 22 via the operation section 23, and gives the temperature detection signal of the pan 14 to the control circuit section 22. Further, the cooling fan 21, the lid heater 18, and the body heater 24 are controlled to be energized by a drive control signal provided from the control circuit unit 22, respectively.
【００２９】次に、本実施例の作用について図５および
図６をも参照して説明する。鍋１４内に所定量の米と水
が収容され、操作部２３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２２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２０は、制御回路部２２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１６に
供給するようになる。Next, the operation of this embodiment will be described with reference to FIGS. 5 and 6. When a predetermined amount of rice and water are stored in the pan 14 and an operation for commanding the execution of rice cooking is performed by the operation unit 23, the control circuit unit 22 executes the rice cooking program and starts the rice cooking operation. When the control signal is output from the control circuit unit 22, the inverter circuit unit 20 supplies the induction heating coil 16 with a high frequency current having a predetermined frequency.
【００３０】これにより、誘導加熱コイル１６の周囲に
発生した磁束Φは、鍋１４との間の空隙部Ｇ，誘導発熱
部２５内部，鍋１４との間の空隙部Ｇを通り、フェライ
ト１７内を通るようになる。このとき、誘導発熱部２５
の上端部の位置が誘導加熱コイル１６の上端部の位置か
ら寸法Δｈだけ高くなるように設定しているので、磁束
Φをほとんど誘導発熱部２５内を通すことができる。つ
まり、磁束Φが熱伝導部２７側に通って誘導加熱コイル
１６のインピーダンスが低下するのを防止して誘導発熱
部２５における発熱動作を効率良く実施できるのであ
る。As a result, the magnetic flux Φ generated around the induction heating coil 16 passes through the space G between the pan 14 and the induction heating portion 25, the space G between the pan 14 and the inside of the ferrite 17. Will pass through. At this time, the induction heating unit 25
Since the position of the upper end of the induction heating coil 16 is set to be higher than the position of the upper end of the induction heating coil 16 by a dimension Δh, most of the magnetic flux Φ can pass through the induction heating portion 25. That is, it is possible to prevent the magnetic flux Φ from passing through the heat conducting portion 27 side and reduce the impedance of the induction heating coil 16, and to efficiently perform the heat generating operation in the induction heating portion 25.
【００３１】そして、誘導発熱部２５の表層部では磁束
の変化に伴う誘導電流が発生して（図５中×印で示す部
分）その抵抗損失による発熱が起こるようになる。誘導
発熱部２５を構成している磁性体材料は熱伝導率が小さ
いので、このとき発生した熱は、主として低融点合金層
２６を介して熱伝導部２７に伝達され、熱伝導率が大き
いこの熱伝導部２７内で底面部や側壁部側に伝達される
と共に鍋１４内部側の被加熱物に伝達されるようにな
る。Then, in the surface layer portion of the induction heating portion 25, an induced current is generated due to the change of the magnetic flux (a portion indicated by X in FIG. 5), and heat is generated due to the resistance loss. Since the magnetic material forming the induction heating portion 25 has a low thermal conductivity, the heat generated at this time is mainly transferred to the thermal conduction portion 27 through the low melting point alloy layer 26, and the thermal conductivity is high. The heat is transmitted to the bottom surface portion and the side wall portion inside the heat conducting portion 27 and is also transmitted to the object to be heated inside the pan 14.
【００３２】この場合、熱容量が大きい誘導発熱部２５
は、主として誘導加熱コイル１６と対向する部分に設け
られているので、鍋１４の底面周縁部で発熱されると共
に、その熱は熱伝導が良好な熱伝導部２７内を介して鍋
１４の底面中央部側および側壁上部側にも伝達されるこ
とになる。したがって、鍋１４の底面周縁部を最高温度
として他の被加熱物と接触している鍋１４の底面中央部
や側壁部分にも十分に熱が伝達されるようになる。In this case, the induction heating section 25 having a large heat capacity
Is mainly provided in the portion facing the induction heating coil 16, so that heat is generated at the peripheral portion of the bottom surface of the pot 14, and the heat is transmitted through the inside of the heat conducting portion 27 having good heat conduction to the bottom surface of the pot 14. It is also transmitted to the central portion side and the side wall upper portion side. Therefore, the heat is sufficiently transmitted to the central portion of the bottom surface and the side wall portion of the pan 14 which is in contact with other objects to be heated, with the peripheral portion of the bottom surface of the pan 14 as the maximum temperature.
【００３３】また、鍋１４の誘導発熱部２５と熱伝導部
２７との間に低融点合金層２６を介在させる構成として
いるので、両者の間が常に密着状態とされており、誘導
発熱部２５で発生した熱を効率良く熱伝導部２７に伝達
される。Further, since the low melting point alloy layer 26 is interposed between the induction heating part 25 and the heat conducting part 27 of the pan 14, the two are always in close contact with each other, and the induction heating part 25 The heat generated in 1 is efficiently transmitted to the heat conducting portion 27.
【００３４】これにより、図１中に鍋１４内部側に実線
で示すように、被加熱物としての水と米を底面周縁部側
から加熱して中央部に至る大きな対流を起こして全体を
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、蒸らし工
程においてもコゲつき等が発生することもなくなる。As a result, as shown by a solid line inside the pan 14 in FIG. 1, water and rice as the objects to be heated are heated from the peripheral portion of the bottom surface to cause a large convection to reach the central portion and the whole is heated to the temperature. You can cook the rice while heating it to a uniform temperature, steaming, and keeping it warm, etc. The rice is fully pregelatinized to make the rice even and the kogation etc. also occur during the steaming process. Things will disappear.
【００３５】また、誘導発熱部２５で発生した熱を熱伝
導部２７を介して鍋１４全体に良好に伝達することがで
きるので、同じ発熱量でも誘導発熱部２５の発熱部分の
温度を低い状態とすることができ、外部との温度差を少
なくして外部へ流れる無駄な熱量を低減することができ
る。したがって、外槽部１５や誘導加熱コイル１６など
の鍋１４の外部に設ける部材に必要な耐熱特性を低くし
てグレードを下げる構成とすることもできる。Further, since the heat generated in the induction heating section 25 can be satisfactorily transferred to the entire pan 14 via the heat conducting section 27, the temperature of the heating section of the induction heating section 25 is low even with the same heating value. Therefore, it is possible to reduce the temperature difference from the outside and reduce the amount of wasteful heat flowing to the outside. Therefore, it is possible to lower the grade by lowering the heat resistance required for the members provided outside the pan 14 such as the outer tub 15 and the induction heating coil 16.
【００３６】次に、鍋１４の熱伝達特性を示す各部の熱
抵抗について図５および図６を参照して述べる。すなわ
ち、鍋１４の底面周縁部の断面を模式的に示した図５に
おいて、鍋１４の誘導発熱部２５を熱源点Ｆ（図中×印
で示す領域の中央部分）とし、その直ぐ外部の空隙領域
Ｇの点ａ，熱源点Ｆと厚さ方向に対応する熱伝導部２６
内の点Ａ１，熱伝導部２６内の異なる点Ａ２，Ａ３およ
びそれらの点Ａ１，Ａ２，Ａ３に最も近い鍋１４内の水
と接する部分の点Ｗ１，Ｗ２，Ｗ３との各点間の熱抵抗
ＲFa，ＲFA，ＲAW1 ，ＲAW2 ，ＲAW3 ，ＲAH1 ，ＲAH2
を次のように定義する。Next, the thermal resistance of each portion showing the heat transfer characteristics of the pan 14 will be described with reference to FIGS. 5 and 6. That is, in FIG. 5 schematically showing the cross section of the peripheral portion of the bottom surface of the pan 14, the induction heating portion 25 of the pan 14 is used as the heat source point F (the central portion of the area indicated by the mark X in the figure), and the void immediately outside thereof is provided. The heat conduction part 26 corresponding to the point a of the region G, the heat source point F, and the thickness direction
Between points A1, A2 in the heat conducting section 26 and points A2, A3 in the heat conducting section 26 and points W1, W2, W3 in the portion in contact with water in the pot 14 closest to those points A1, A2, A3 Resistors RFa, RFA, RAW1, RAW2, RAW3, RAH1, RAH2
Is defined as follows.
【００３７】ＲFa ：誘導発熱部２５の熱源点Ｆと外部
空隙領の点ａとの間の熱抵抗 ＲFA ：誘導発熱部２５の熱源点Ｆと熱伝導部２７の点
Ａ１との間の熱抵抗 ＲAW1 ：熱伝導部２７の点Ａ１と鍋１４内部の水Ｗ１と
の間の熱抵抗 ＲAW2 ：熱伝導部２７の点Ａ２と鍋１４内部の水Ｗ２と
の間の熱抵抗 ＲAW3 ：熱伝導部２７の点Ａ３と鍋１４内部の水Ｗ３と
の間の熱抵抗 ＲAH1 ：熱伝導部２７の点Ａ１と点Ａ２との間の熱抵抗 ＲAH2 ：熱伝導部２７の点Ａ２と点Ａ３との間の熱抵抗RFa: Thermal resistance between the heat source point F of the induction heating part 25 and the point a of the external void region RFA: Thermal resistance between the heat source point F of the induction heating part 25 and the point A1 of the heat conducting part 27 RAW1: Thermal resistance between the point A1 of the heat conducting section 27 and the water W1 inside the pot 14 RAW2: Thermal resistance between the point A2 of the heat conducting section 27 and water W2 inside the pot 14 RAW3: The thermal conducting section 27 Between the point A3 and the water W3 inside the pan 14 RAH1: The thermal resistance between the points A1 and A2 of the heat conducting section RAH2: Between the points A2 and A3 of the heat conducting section 27 Thermal resistance
【００３８】図６は上述の各点間と各熱抵抗との関係を
等価回路で示したものである。ここで、熱源点Ｆの温度
をｔF とし、各点ａ，Ａ１，Ａ２，Ａ３，Ｗ１，Ｗ２，
Ｗ３の温度をそれぞれｔａ，ｔA1，ｔA2，ｔA3，ｔW1，
ｔW2，ｔW3としている。ただし、保温状態においては水
の温度は飯の温度である。FIG. 6 is an equivalent circuit diagram showing the relationship between the points and the thermal resistances. Here, the temperature of the heat source point F is set to tF, and each point a, A1, A2, A3, W1, W2
The temperatures of W3 are ta, tA1, tA2, tA3, tW1, respectively.
It is set to tW2 and tW3. However, in the heat retaining state, the temperature of water is the temperature of rice.
【００３９】さて、磁性体製の誘導発熱部２５は熱抵抗
が高いので、表面に平行な方向への熱伝達量は非常に少
なく、ほとんどが低融点合金層２６を介して接触してい
る熱伝導部２７側と鍋１４の外部の間隙部分の点ａ側に
伝達されるようになる。そして、熱伝導部２７に伝達さ
れた熱は、鍋１４内部の水（点Ｗ１）に直接伝達される
と共に、熱伝導部２７の表面に平行な方向の各点（Ａ
２，Ａ３…）に伝達されながら鍋１４内部の水（点Ｗ
２，Ｗ３…）に伝達されるようになる。Since the induction heating portion 25 made of a magnetic material has a high thermal resistance, the amount of heat transfer in the direction parallel to the surface is very small, and most of the heat is in contact with the low melting point alloy layer 26. It is transmitted to the point a side of the gap portion outside the conducting portion 27 side and the pan 14. Then, the heat transferred to the heat conducting section 27 is directly transferred to the water (point W1) inside the pot 14 and also at each point (A in the direction parallel to the surface of the heat conducting section 27).
2, A3 ...) while being transmitted to the water inside the pot 14 (point W
2, W3 ...).
【００４０】誘導発熱部２５の熱源点Ｆで発生している
総熱量Ｗ０は、鍋１４の内部側に伝達されて加熱調理に
寄与する熱量Ｗｗと外部の点ａに伝達されて無駄となる
熱量Ｗａとに分配されることになるので、熱伝達特性と
しては、鍋１４の内部側に伝達される熱量Ｗｗが大きい
ほど効率が良いことになる。The total amount of heat W0 generated at the heat source point F of the induction heating section 25 is the amount of heat Ww that is transmitted to the inner side of the pan 14 and contributes to cooking and the amount of heat that is wasted by being transmitted to the external point a. As the heat transfer characteristic, the larger the amount Ww of heat transferred to the inner side of the pan 14, the higher the efficiency.
【００４１】図６における等価回路で、熱源点Ｆと被加
熱物である鍋１４内の水Ｗ間の合成熱抵抗ＲFWは、熱抵
抗ＲFA，ＲAW1 ，ＲAW2 ，ＲAW3 ，ＲAH1 ，ＲAH2 の合
成熱抵抗として求めることができる。そして、鍋１４の
熱伝導部２７の表面と平行な方向の熱抵抗ＲAHは厚肉に
形成していることから十分に小さくすることができ、全
体としての合成熱抵抗ＲFWを小さくすることができる。
これにより、鍋１４の内部側に伝達される熱量Ｗｗを大
きくして熱効率を向上させることができるのである。In the equivalent circuit of FIG. 6, the combined thermal resistance RFW between the heat source point F and the water W in the pan 14 which is the object to be heated is the combined thermal resistance of the thermal resistances RFA, RAW1, RAW2, RAW3, RAH1 and RAH2. Can be asked as The thermal resistance RAH in the direction parallel to the surface of the heat conducting portion 27 of the pan 14 can be made sufficiently small because it is formed thick, and the overall combined thermal resistance RFW can be made small. .
As a result, the amount of heat Ww transferred to the inner side of the pot 14 can be increased to improve the thermal efficiency.
【００４２】また、合成熱抵抗ＲFWが小さくなることか
ら、誘導発熱部２５の熱源点Ｆの温度ｔF が低くなり、
外部の空隙ａ点との温度ｔａとの差が小さくなって熱損
失が低下することがわかる。さらに、熱伝導部２７の底
面部を厚肉に形成していることから、熱伝導部２７内部
での熱抵抗ＲAH1 ，ＲAH2 等が小さくなるので、各点Ａ
１，Ａ２，Ａ３間の温度ｔA1，ｔA2，ｔA3の差も小さく
なって、鍋１４の各部の温度が均一になることがわか
る。Further, since the combined thermal resistance RFW becomes small, the temperature tF at the heat source point F of the induction heating section 25 becomes low,
It can be seen that the difference between the outside air point a and the temperature ta becomes small and the heat loss decreases. Furthermore, since the bottom surface of the heat conducting portion 27 is formed thick, the thermal resistances RAH1, RAH2, etc. inside the heat conducting portion 27 are reduced, so that each point A
It can be seen that the differences in the temperatures tA1, tA2, tA3 between 1, A2 and A3 are also small, and the temperatures of the respective parts of the pan 14 are uniform.
【００４３】このような本実施例によれば、鍋１４を、
誘導加熱コイル１６に対応する部分に形成される磁性ス
テンレス製の誘導発熱体２５と溶湯鍛造技術によりアル
ミニウム合金等の熱良導体材料からなる熱伝導部２７と
それらの間に介在される低融点合金層２６とから構成し
たので、誘導発熱部２５で発生する熱を低融点合金層２
６を介して効率良く熱伝導部２７に伝達できると共に、
熱伝導部２７内を効率良く伝達して鍋１４全体を均一に
加熱することができ、さらに、外部への無駄な熱の放出
を抑制して熱効率の良い炊飯加熱調理を行うことができ
る。According to this embodiment, the pot 14 is
A magnetic stainless steel induction heating element 25 formed in a portion corresponding to the induction heating coil 16, a heat conducting portion 27 made of a heat conductive material such as an aluminum alloy by a molten metal forging technique, and a low melting point alloy layer interposed therebetween. And the low melting point alloy layer 2
6 can be efficiently transmitted to the heat conducting section 27 via 6,
The whole of the pan 14 can be uniformly heated by efficiently transmitting the heat inside the heat conducting portion 27, and further, wasteful heat release to the outside can be suppressed and cooking of rice with high heat efficiency can be performed.
【００４４】また、このように全体を均一に加熱できる
ことから、鍋１４の容量が比較的小さい場合には誘導加
熱コイル１６を鍋１４の底面周縁部に配設すれば十分加
熱動作を行うことができるので、誘導加熱コイルを他の
部分に設けたりする必要がなくなって簡単な構成とする
ことができ、さらに、蓋ヒータ１８や胴ヒータ２４を炊
飯時に使用して均一加熱を行うための制御を行う必要も
なくなるので、全体として加熱のための構成を簡単にす
ることができる。In addition, since the whole pan can be uniformly heated in this way, when the pan 14 has a relatively small capacity, the induction heating coil 16 can be arranged on the peripheral portion of the bottom surface of the pan 14 to perform a sufficient heating operation. Therefore, it is not necessary to provide an induction heating coil in another portion, and a simple structure can be obtained. Further, control for performing uniform heating by using the lid heater 18 and the body heater 24 during rice cooking is possible. Since there is no need to perform this, the structure for heating can be simplified as a whole.
【００４５】さらに、上記のように鍋１４を構成するこ
とから、必要な部分にのみ誘導発熱部２５を設けて高価
で且つ重い磁性ステンレス材等の磁性体の使用量を削減
して低コスト化および軽量化が図れると共に、誘導加熱
コイル１６と対向しない部分に不必要な誘導発熱部を設
けないことからその厚さ寸法分だけ厚さ寸法を薄くした
り熱伝導部２７の厚さ寸法を増すことができる。Further, since the pan 14 is constructed as described above, the induction heating portion 25 is provided only in a necessary portion to reduce the amount of the expensive and heavy magnetic material such as magnetic stainless steel material used, thereby reducing the cost. In addition, the weight can be reduced, and the unnecessary induction heating portion is not provided in the portion that does not face the induction heating coil 16. Therefore, the thickness dimension can be reduced by the thickness dimension or the thickness dimension of the heat conduction portion 27 can be increased. be able to.
【００４６】そして、本実施例によれば、鍋１４の誘導
発熱部２５と熱伝導部２７との間に低融点合金層２６を
設ける構成としているので、溶湯鍛造等の成形により鍋
１４を形成する際に、冷却時に熱膨張率の差から誘導発
熱部２５と熱伝導部２７との間に空隙等が発生すること
なく安定した密着状態を保持することができるので、誘
導発熱部２５から熱伝導部２７への熱伝達効率を向上さ
せることができる。Further, according to the present embodiment, since the low melting point alloy layer 26 is provided between the induction heating part 25 and the heat conducting part 27 of the pan 14, the pan 14 is formed by molding such as molten metal forging. At the time of cooling, a stable contact state can be maintained without a gap or the like between the induction heating part 25 and the heat conducting part 27 due to the difference in the coefficient of thermal expansion during cooling, so that the heat generated from the induction heating part 25 can be maintained. The efficiency of heat transfer to the conductive portion 27 can be improved.
【００４７】さらに、本実施例によれば、誘導発熱部２
５の上端部の位置を、誘導加熱コイル２５の上端部位置
から、鍋と誘導加熱コイルとの間隔寸法Ｇよりも上に位
置するように鍋１４を構成したので、誘導加熱コイル１
６による磁束Φをほとんど誘導発熱部２５内に通すよう
にすることができ、熱伝導部２７側に漏れて誘導加熱コ
イル１６のインピーダンスが低下する不具合を解消して
発熱効率を向上させることができる。Further, according to this embodiment, the induction heating section 2
Since the pan 14 is configured so that the position of the upper end of the pan 5 is located above the position of the upper end of the induction heating coil 25, above the distance G between the pan and the induction heating coil, the induction heating coil 1
Most of the magnetic flux Φ due to 6 can be made to pass through the induction heating portion 25, and the problem that the impedance of the induction heating coil 16 is reduced by leaking to the heat conducting portion 27 side can be solved and the heating efficiency can be improved. .
【００４８】なお、上述の場合に、誘導発熱部２５の上
端部の位置を必要以上に高い位置に設定することは、前
述の効果を減少させることになるので、所定効率が達成
できる程度に設定することが好ましい。In the above case, setting the position of the upper end portion of the induction heating portion 25 to a position higher than necessary reduces the above-mentioned effect, so that it is set to the extent that a predetermined efficiency can be achieved. Preferably.
【００４９】さらに、本実施例によれば、鍋１４の被加
熱物と接触しない側壁上部においては熱伝導部２７を薄
肉に形成しているので、鍋１４の軽量化を図ると共に、
鍋１４による加熱に不要な部分の熱容量を低減すること
ができ、全体として熱効率を改善できる。Further, according to the present embodiment, the heat conducting portion 27 is formed thin in the upper portion of the side wall of the pot 14 that does not come into contact with the object to be heated, so that the weight of the pot 14 can be reduced and
It is possible to reduce the heat capacity of a portion unnecessary for heating by the pan 14, and improve the thermal efficiency as a whole.
【００５０】なお、上記実施例においては、溶湯鍛造技
術による製作の都合上で誘導発熱部２５を鍋１４の底面
部まで設ける構成としたが、誘導加熱コイル１６と対向
していない底面部においては本来発熱に寄与していない
ので、磁性ステンレス材を設けないようにした誘導発熱
部を構成することもできる。In the above embodiment, the induction heating portion 25 is provided up to the bottom portion of the pan 14 for the sake of manufacturing by the molten metal forging technique. However, in the bottom portion which does not face the induction heating coil 16, Since it does not inherently contribute to heat generation, it is possible to configure an induction heating section without providing a magnetic stainless material.
【００５１】また、上記実施例においては、中容量程度
の炊飯を行う鍋を想定して誘導加熱コイルを鍋１４の底
面周縁部に集中して配置する構成としたが、大容量の炊
飯器に適用する場合には、必要に応じて鍋の底面部や側
壁外周部に補助的に誘導加熱コイルを配設することもで
きる。Further, in the above embodiment, the induction heating coil is arranged centrally on the peripheral portion of the bottom surface of the pan 14 on the assumption that the pan is for cooking rice of medium capacity. When applied, an induction heating coil can be additionally provided on the bottom surface of the pot or the outer peripheral portion of the side wall, if necessary.
【００５２】図８および図９は本発明の第２の実施例を
示すもので、以下、第１の実施例と異なる部分について
説明する。すなわち、この第２の実施例においては、鍋
１４に代えて、鍋２８を設けた構成としている。この鍋
２８は、図８に示すように、第１の実施例における鍋１
４の誘導発熱部２５と熱伝導部２７とを有する構成とさ
れ、これらの間に介在される低融点合金層２６に代えて
複合金属層２９を有する構成となっている。FIG. 8 and FIG. 9 show the second embodiment of the present invention, and the portions different from the first embodiment will be described below. That is, in the second embodiment, the pot 28 is provided instead of the pot 14. As shown in FIG. 8, this pot 28 is the pot 1 in the first embodiment.
4 has an induction heating portion 25 and a heat conduction portion 27, and has a composite metal layer 29 in place of the low melting point alloy layer 26 interposed therebetween.
【００５３】また、第１の実施例と同様にして熱良導体
材料からなる熱伝導部２７は、溶湯鍛造技術を用いて形
成される。この場合、誘導発熱部２５の内面側には、あ
らかじめ次のようにして磁性材料層３０が形成される。Further, as in the first embodiment, the heat conducting portion 27 made of a good heat conductive material is formed by using a molten metal forging technique. In this case, the magnetic material layer 30 is previously formed on the inner surface side of the induction heating portion 25 as follows.
【００５４】まず、誘導発熱部２５の内面側に、鉄ある
いはステンレスなどの磁性材料からなる金属粒子粉をバ
インダ材料に溶かしてペースト状にしたものを塗布し、
これを乾燥させた後に真空中で高温で焼結させる。これ
により、金属粒子粉同士が接触する状態でしかも金属粒
子粉の周囲に存在していたバインダ材料が気化すること
により抜けて空洞となった状態の凹凸を有する構造の磁
性材料層３０が形成される。これは、図９に模式的な断
面で示すように、誘導発熱部２５の内面側に一体に形成
された状態となる。First, on the inner surface side of the induction heating part 25, a paste-like material prepared by dissolving metal particle powder made of a magnetic material such as iron or stainless in a binder material is applied,
It is dried and then sintered at high temperature in vacuum. As a result, the magnetic material layer 30 having a structure in which the metal particles are in contact with each other and the binder material existing around the metal particles is vaporized to escape and become hollow is formed. It This is in a state of being integrally formed on the inner surface side of the induction heating portion 25, as shown in a schematic cross section in FIG. 9.
【００５５】そして、このように誘導発熱部２５の内面
側に磁性材料層３０を形成した状態で溶湯鍛造を行う
と、溶融されたアルミニウムを高圧で成形する際に、そ
のアルミニウムが磁性材料層３０の凹部である金属粒子
粉の空隙部分３０ａに流入してその隙間を埋めるように
なるので、図９に拡大した断面図で示すように、磁性材
料とアルミニウムとが入り組んだ状態に混在する複合合
金層２９が形成されるようになる。If the molten material is forged with the magnetic material layer 30 formed on the inner surface of the induction heating portion 25 in this way, when the molten aluminum is formed at a high pressure, the aluminum will be the magnetic material layer 30. As it flows into the void portion 30a of the metal particle powder, which is the recessed portion, and fills the gap, as shown in the enlarged cross-sectional view of FIG. 9, the composite alloy in which the magnetic material and the aluminum are mixed in a complicated state. The layer 29 comes to be formed.
【００５６】これにより、誘導発熱部２５の内側部分に
アルミニウム合金層による熱伝導部２７が形成され、誘
導発熱部２５と熱伝導部２７との間には磁性材料とアル
ミニウムとが互いに入り組むような複合状態に構成され
た複合金属層２９が介在されるようになる。この複合金
属層２９は、誘導発熱部２５と熱伝導部２７との間を完
全に接合する状態と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、単に両者を鋳くるむ場
合に発生するような異種金属間での隙間の発生をなくす
ことができる。したがって、このような第２の実施例に
よっても第１の実施例と同様の作用効果を得ることがで
きる。As a result, the heat conducting portion 27 made of the aluminum alloy layer is formed inside the induction heating portion 25, so that the magnetic material and aluminum are intruded between the induction heating portion 25 and the heat conducting portion 27. The composite metal layer 29 configured in such a complex state is interposed. Since the composite metal layer 29 can completely bond the induction heating portion 25 and the heat conducting portion 27, the thermal resistance between them can be reduced, and both can be simply cast. It is possible to eliminate the occurrence of gaps between dissimilar metals which may occur in some cases. Therefore, according to the second embodiment as described above, it is possible to obtain the same effects as those of the first embodiment.
【００５７】なお、上記第２の実施例では、磁性材料層
３０をバインダ材料に金属粒子粉を溶かしたペースト状
のものを誘導発熱部２５の内面側に塗布して焼結するこ
とにより形成したが、これに代えて、例えば、鉄あるい
はステンレスなどの磁性材料を誘導発熱部２５の内面側
に溶射により付着させ、誘導発熱部２５と部分的に合金
化させることにより磁性材料層３０を形成することもで
きる。また、この場合に、溶射を行った後に、水素炉あ
るいは真空炉内で還元雰囲気中で焼結させることによ
り、溶射層を活性化させると、アルミニウムによる熱伝
導部２７との間の密着結合力をさらに強固なものとする
ことができる。In the second embodiment, the magnetic material layer 30 is formed by applying a paste-like material in which metal particle powder is dissolved in a binder material to the inner surface of the induction heating section 25 and sintering it. However, instead of this, for example, a magnetic material such as iron or stainless steel is deposited on the inner surface side of the induction heating portion 25 by thermal spraying and partially alloyed with the induction heating portion 25 to form the magnetic material layer 30. You can also Further, in this case, after the thermal spraying, if the thermal sprayed layer is activated by sintering in a reducing atmosphere in a hydrogen furnace or a vacuum furnace, the adhesion bonding force between the heat conductive portion 27 and aluminum is increased. Can be made even stronger.
【００５８】[0058]
【発明の効果】以上説明したように、本発明の炊飯器に
よれば、次のような効果を得ることができる。すなわ
ち、請求項１記載の炊飯器によれば、鍋の底面周縁部分
と対応する位置に誘導加熱コイルを設け、鍋の誘導発熱
部を誘導加熱コイルに対応した形状に形成し、且つ前記
熱伝導部を溶融状態の前記熱良導体材料を成形すること
により形成したので、誘導加熱コイルによる発熱に有効
な部分にのみ誘導発熱部を設ける構成として低コスト
化，軽量化を図ることができ、また、熱伝導部の肉厚を
必要な部分に対応して厚さ寸法を設定できることによ
り、軽量化を図りながら誘導発熱部で発生する熱を熱伝
導部内で効率良く伝達して鍋全体を均一に加熱すること
ができ、したがって、鍋を均一に加熱するために誘導加
熱コイルを複数設けたり加熱むらを防止するための蓋ヒ
ータ，胴ヒータ等の複雑な温度制御を行う必要もなくな
るという優れた効果を奏する。As described above, according to the rice cooker of the present invention, the following effects can be obtained. That is, according to the rice cooker of claim 1, an induction heating coil is provided at a position corresponding to the peripheral portion of the bottom surface of the pan, the induction heating portion of the pan is formed in a shape corresponding to the induction heating coil, and the heat conduction is performed. Since the portion is formed by molding the heat-conductive material in a molten state, it is possible to reduce the cost and weight as a configuration in which the induction heating portion is provided only in a portion effective for heat generation by the induction heating coil. The thickness of the heat transfer part can be set according to the required part, so that the heat generated in the induction heating part can be efficiently transmitted in the heat transfer part while heating the entire pan evenly while reducing the weight. Therefore, it is not necessary to provide a plurality of induction heating coils in order to uniformly heat the pot or to perform complicated temperature control such as a lid heater and a body heater for preventing uneven heating. Achieve the results.
【００５９】請求項２記載の炊飯器によれば、誘導発熱
部と熱伝導部との間に低融点合金層を介在させる構成と
しているので、例えば熱伝導部を形成する際に冷却時に
温度差によって誘導発熱部との間に隙間が発生しやすい
状態であっても、これらの間を低融点合金層により密着
性を良好に保持することができるので、誘導発熱部によ
り発生された熱を効率良く熱伝導部に伝達させることが
できるようになるという優れた効果を奏する。According to the rice cooker of the second aspect, since the low melting point alloy layer is interposed between the induction heating part and the heat conducting part, for example, when forming the heat conducting part, there is a temperature difference during cooling. Even if a gap is easily generated between the induction heating part and the induction heating part, good adhesion can be maintained by the low melting point alloy layer between them, so the heat generated by the induction heating part can be efficiently transferred. It has an excellent effect that it can be well transferred to the heat conducting portion.
【００６０】請求項３記載の炊飯器によれば、誘導発熱
部と熱伝導部との間に設けられた複合金属層は、誘導発
熱部の内面側に一体に形成された磁性材料層の凹部内に
熱良導体が入り込んだ状態に形成されているので、誘導
発熱部と熱伝導部との間の密着性を高めることができる
ので、誘導発熱部により発生された熱を効率良く熱伝導
部に伝達させることができるという優れた効果を奏す
る。According to the rice cooker of the third aspect, the composite metal layer provided between the induction heating part and the heat conducting part is a recess of the magnetic material layer integrally formed on the inner surface side of the induction heating part. Since a good thermal conductor is formed inside, it is possible to enhance the adhesion between the induction heating part and the heat conducting part, so that the heat generated by the induction heating part can be efficiently transferred to the heat conducting part. It has an excellent effect that it can be transmitted.
【００６１】請求項４記載の炊飯器によれば、磁性材料
層を、磁性材料の微粒子を誘導発熱部の内面側に塗布し
た状態で焼結させることにより形成した金属焼結層とし
ているので、簡単な構成としながら、誘導発熱部と熱伝
導部との間の密着性を向上させる構成を得ることができ
るという優れた効果を奏する。According to the rice cooker of the fourth aspect, since the magnetic material layer is a metal sintered layer formed by sintering fine particles of the magnetic material applied to the inner surface side of the induction heating portion, the metal sintered layer is formed. It is possible to obtain an excellent effect that it is possible to obtain a configuration that improves the adhesion between the induction heating section and the heat conduction section while having a simple configuration.
【００６２】請求項５記載の炊飯器によれば、誘導発熱
部の上端部の位置を誘導加熱コイルの上端部の位置か
ら、鍋と誘導発熱部との間の間隔距離よりも高くなるよ
うに設定したので、誘導加熱コイルによる磁束をほとん
ど誘導発熱部に通すことができ、誘導加熱コイルのイン
ピーダンス低下を防止して誘導発熱部による発熱動作を
効率的に行なわせることができるという優れた効果を奏
する。According to the rice cooker of the fifth aspect, the position of the upper end of the induction heating part is higher than the position of the upper end of the induction heating coil than the distance between the pan and the induction heating part. Since the setting is made, most of the magnetic flux generated by the induction heating coil can be passed through the induction heating section, and it is possible to prevent the impedance reduction of the induction heating coil and efficiently perform the heating operation by the induction heating section. Play.
【図１】本発明の第１の実施例を示す鍋と誘導加熱コイ
ル部分の縦断側面図FIG. 1 is a vertical sectional side view of a pan and an induction heating coil portion showing a first embodiment of the present invention.
【図２】全体構成の縦断側面図FIG. 2 is a vertical sectional side view of the entire configuration.
【図３】鍋の部分断面図[Figure 3] Partial cross-section of the pot
【図４】電気的構成の概略図FIG. 4 is a schematic diagram of an electrical configuration.
【図５】鍋と誘導加熱コイルとの間の熱抵抗の説明図FIG. 5 is an explanatory diagram of thermal resistance between the pan and the induction heating coil.
【図６】熱抵抗で表した等価回路図FIG. 6 is an equivalent circuit diagram expressed by thermal resistance.
【図７】溶湯鍛造技術による鍋の製造工程を示す縦断側
面図FIG. 7 is a vertical sectional side view showing a manufacturing process of a ladle by a molten metal forging technique.
【図８】本発明の第２の実施例を示す図１相当図FIG. 8 is a diagram corresponding to FIG. 1 showing a second embodiment of the present invention.
【図９】図３相当図FIG. 9 is a view corresponding to FIG.
【図１０】従来例を示す鍋の縦断側面図FIG. 10 is a vertical sectional side view of a conventional pan.
１１は炊飯器本体、１２は蓋部、１４，２８は鍋、１５
は外槽部、１６は誘導加熱コイル、１７はフェライト、
１８は蓋ヒータ、１９は温度センサ、２０はインバータ
回路部、２１は冷却ファン、２２は制御回路部、２３は
操作部、２４は胴ヒータ、２５は誘導発熱部、２６は低
融点合金層、２７は熱伝導部、２９は複合金属層、３０
は磁性材料層である。11 is a rice cooker main body, 12 is a lid, 14 and 28 are pots, 15
Is an outer tank part, 16 is an induction heating coil, 17 is ferrite,
18 is a lid heater, 19 is a temperature sensor, 20 is an inverter circuit section, 21 is a cooling fan, 22 is a control circuit section, 23 is an operation section, 24 is a body heater, 25 is an induction heating section, 26 is a low melting point alloy layer, 27 is a heat conducting part, 29 is a composite metal layer, 30
Is a magnetic material layer.
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【手続補正書】[Procedure amendment]
【提出日】平成６年７月１５日[Submission date] July 15, 1994
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】請求項３[Name of item to be corrected] Claim 3
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【手続補正２】[Procedure Amendment 2]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】請求項４[Name of item to be corrected] Claim 4
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【手続補正３】[Procedure 3]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００１１[Correction target item name] 0011
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【００１１】さらに、鍋を、誘導発熱部と熱伝導部との
間に複合金属層を形成する構成とし、前記複合金属層
を、前記誘導発熱部の内面側に一体に形成された微細な
凹凸を有する金属材料層としての磁性材料層の凹部内に
前記熱伝導部の成形時に溶融状態の熱良導体が流入する
ことにより形成する構成とすることもできる。Further, the pot is constructed such that a composite metal layer is formed between the induction heating part and the heat conducting part, and the composite metal layer is formed on the inner surface side of the induction heating part so as to form fine irregularities. It is also possible to adopt a configuration in which a good thermal conductor in a molten state flows into the concave portion of the magnetic material layer as the metal material layer having the above-mentioned when the heat conducting portion is molded.
【手続補正４】[Procedure amendment 4]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００１２[Correction target item name] 0012
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【００１２】そして、誘導発熱部の金属材料層を、金属
材料の微粒子を塗布した状態で焼結することにより得ら
れる金属焼結層としても良い。The metal material layer of the induction heating section may be a metal sintered layer obtained by sintering the metal material fine particles in a coated state.
Claims (5)
の外面部に磁性材料からなる誘導発熱部を設けてなる鍋
と、 この鍋の底面周縁部分と対応した位置にその鍋と所定間
隙を存した状態で配置された誘導加熱コイルとを備え、 前記鍋は、前記誘導発熱部が前記誘導加熱コイルに対応
した形状に形成され、且つ前記熱伝導部が溶融状態の前
記熱良導体材料を成形することにより形成されているこ
とを特徴とする炊飯器。1. A pot having an induction heating section made of a magnetic material on the outer surface of a container-like heat conducting section made of a good thermal conductor material, and a predetermined gap with the pot at a position corresponding to the peripheral portion of the bottom surface of the pot. And an induction heating coil arranged in a state of existing, the pan, the induction heating part is formed in a shape corresponding to the induction heating coil, and the heat conduction part is the heat good conductor material in a molten state. A rice cooker characterized by being formed by molding.
間に低融点合金層が介在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 rice cooker according to claim 1, wherein a low-melting-point alloy layer is interposed between the induction heating part and the heat conducting part which compose the pan.
成された複合金属層を有し、前記複合金属層は、前記誘
導発熱部の内面側に一体に形成された微細な凹凸を有す
る磁性材料層の凹部内に前記熱伝導部の成形時に溶融状
態の熱良導体が流入することにより形成されることを特
徴とする請求項１記載の炊飯器。3. The pan has a composite metal layer formed between an induction heating part and a heat conducting part, and the composite metal layer is a finely formed fine particle integrally formed on the inner surface side of the induction heating part. The rice cooker according to claim 1, wherein the rice cooker is formed by flowing a good thermal conductor in a molten state into the concave portion of the magnetic material layer having irregularities when the heat conducting portion is formed.
微粒子を塗布した状態で焼結することにより得られる金
属焼結層としたことを特徴とする請求項３記載の炊飯
器。4. The rice cooker according to claim 3, wherein the magnetic material layer of the induction heating part is a metal sintered layer obtained by sintering fine particles of the magnetic material in a coated state.
端部の位置から少なくともその誘導加熱コイルとの間の
寸法よりも高い位置まで配設されるように形成したこと
を特徴とする請求項１ないし４のいずれかに記載の炊飯
器。5. The heating portion of the pan is formed so as to be arranged from a position of an upper end portion of a side surface of the induction heating coil to a position higher than at least a dimension between the induction heating coil and the induction heating coil. Item 5. The rice cooker according to any one of items 1 to 4.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6136791A JP2984545B2 (en) | 1993-11-19 | 1994-06-20 | rice cooker |
| TW083110141A TW328522B (en) | 1994-06-20 | 1994-11-03 | Rice cooker |
| KR1019940030335A KR0171915B1 (en) | 1993-11-19 | 1994-11-18 | Rice cooker |
| CN94117216A CN1054491C (en) | 1993-11-19 | 1994-11-19 | Electric cooker |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5-290621 | 1993-11-19 | ||
| JP29062193 | 1993-11-19 | ||
| JP6136791A JP2984545B2 (en) | 1993-11-19 | 1994-06-20 | rice cooker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07184768A true JPH07184768A (en) | 1995-07-25 |
| JP2984545B2 JP2984545B2 (en) | 1999-11-29 |
Family
ID=26470296
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6136791A Expired - Lifetime JP2984545B2 (en) | 1993-11-19 | 1994-06-20 | rice cooker |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2984545B2 (en) |
| KR (1) | KR0171915B1 (en) |
| CN (1) | CN1054491C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010128721A1 (en) * | 2009-05-04 | 2010-11-11 | 엘지전자 주식회사 | Induction heater |
| CN105559518A (en) * | 2015-12-01 | 2016-05-11 | 珠海优特电力科技股份有限公司 | Cooking pot |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100296493B1 (en) * | 1999-03-31 | 2001-07-03 | 윤영환 | Occurrence apparatus for hydrogen oxygen mixing gas |
| KR20030034485A (en) * | 2001-10-23 | 2003-05-09 | 엘지전자 주식회사 | Induction heating type rice pot |
| KR20030034484A (en) * | 2001-10-23 | 2003-05-09 | 엘지전자 주식회사 | Induction heating type rice pot |
| KR100453548B1 (en) * | 2002-05-14 | 2004-10-20 | 주식회사 클래드 | Method for forming the kitchen cooker of induction heater |
| JP5025154B2 (en) * | 2006-03-30 | 2012-09-12 | タイガー魔法瓶株式会社 | Electric rice cooker |
| CN101849765A (en) * | 2006-03-30 | 2010-10-06 | 虎牌热水瓶株式会社 | Electric cooker |
| KR20110118963A (en) | 2010-04-26 | 2011-11-02 | 한국생산기술연구원 | Heating apparatus with non-contacting charging |
| CN102793465B (en) * | 2012-08-28 | 2015-02-25 | 中国联合网络通信集团有限公司 | Remote automatic cooking system and remote automatic cooking method |
| KR101374187B1 (en) * | 2013-07-11 | 2014-03-13 | 라광민 | Steam generator for cooking using induction heating coil |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2621328B2 (en) * | 1988-04-19 | 1997-06-18 | 松下電器産業株式会社 | Induction cooker |
-
1994
- 1994-06-20 JP JP6136791A patent/JP2984545B2/en not_active Expired - Lifetime
- 1994-11-18 KR KR1019940030335A patent/KR0171915B1/en not_active IP Right Cessation
- 1994-11-19 CN CN94117216A patent/CN1054491C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010128721A1 (en) * | 2009-05-04 | 2010-11-11 | 엘지전자 주식회사 | Induction heater |
| CN105559518A (en) * | 2015-12-01 | 2016-05-11 | 珠海优特电力科技股份有限公司 | Cooking pot |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1107271A (en) | 1995-08-23 |
| CN1054491C (en) | 2000-07-12 |
| KR950013442A (en) | 1995-06-15 |
| JP2984545B2 (en) | 1999-11-29 |
| KR0171915B1 (en) | 1999-02-18 |
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