JP2008132108A - Electromagnetic induction heating cooker - Google Patents

Electromagnetic induction heating cooker Download PDF

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JP2008132108A
JP2008132108A JP2006319827A JP2006319827A JP2008132108A JP 2008132108 A JP2008132108 A JP 2008132108A JP 2006319827 A JP2006319827 A JP 2006319827A JP 2006319827 A JP2006319827 A JP 2006319827A JP 2008132108 A JP2008132108 A JP 2008132108A
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heating element
heating
electromagnetic induction
cooking container
cooking
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JP4722020B2 (en
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Kyoko Hattori
杏子 服部
Kenichi Tamura
憲一 田村
Shigeyuki Nagata
滋之 永田
Hisao Isaka
久夫 井坂
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetic induction heating cooker that allows even heating from above with a simple structure and that allows uniform heating by reducing temperature variation. <P>SOLUTION: The cooker includes a heating coil that generates a magnetic field by a high frequency electric current from an inverter circuit, a cooking container 5 that heats an inside object to be cooked by generating heat through an eddy current from the magnetic field of the heating coil, and a heating element 13 that is attachably/detachably housed in the cooking container 5 and that generates heat by the eddy current from the magnetic field passing through the cooking container 5. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、本体内に収容された調理物を加熱調理する電磁誘導加熱調理器に関するものである。   The present invention relates to an electromagnetic induction heating cooker that cooks cooked food contained in a main body.

この種の電磁誘導加熱調理器として、蓋体を閉じたときに内蓋が内釜内の炊飯面まで下降して，炊飯物を覆うようにした炊飯器がある。この炊飯器の内蓋は，断熱材等で構成され，放熱と蒸気の発生とを抑えて省エネを実現している。また、その内蓋は回転可能で、内釜内の炊飯物を攪拌して温度むらが少なくなるようにしている（例えば、特許文献１参照）。   As this type of electromagnetic induction heating cooker, there is a rice cooker in which when the lid is closed, the inner lid descends to the rice cooking surface in the inner pot to cover the cooked rice. The inner lid of this rice cooker is made of heat insulating material, etc., and achieves energy saving by suppressing heat dissipation and steam generation. Moreover, the inner lid is rotatable, and the cooked rice in the inner pot is agitated so that the temperature unevenness is reduced (see, for example, Patent Document 1).

特開平９−１４０５７３号公報JP-A-9-140573

前述した従来の電磁誘導加熱調理器では，炊飯面を内蓋で覆って放熱と蒸気の発生とを抑えているが、加熱コイルが内釜の下方のみに設けられているため、内釜の底部側と内蓋側との間に温度差が生じていた。   In the conventional electromagnetic induction heating cooker described above, the rice cooking surface is covered with an inner lid to suppress heat dissipation and steam generation, but since the heating coil is provided only below the inner pot, the bottom of the inner pot There was a temperature difference between the side and the inner lid side.

本発明は、前記のような課題を解決するためになされたもので、簡単な構成で上方からの加熱も行うことができ、温度ムラを低減して均一な加熱を行うことが可能な電磁誘導加熱調理器を提供することを目的とする。   The present invention has been made to solve the above-described problems, and can be heated from above with a simple configuration, and electromagnetic induction capable of performing uniform heating with reduced temperature unevenness. An object is to provide a cooking device.

本発明に係る電磁誘導加熱調理器は、インバータ回路からの高周波電流により磁界を発生する電磁誘導体と、磁力線を通し、電磁誘導体の磁界による渦電流により発熱し、内部の調理物を加熱する調理容器と、調理容器内に着脱可能に収納され、その調理容器を通過した磁界による渦電流により発熱する発熱体とを備えたものである。   An electromagnetic induction heating cooker according to the present invention is a cooking container that heats an internal cooking product through an electromagnetic derivative that generates a magnetic field by a high-frequency current from an inverter circuit and heat generated by an eddy current due to the magnetic field of the electromagnetic derivative through a magnetic field line. And a heating element that is detachably housed in the cooking container and generates heat due to an eddy current caused by a magnetic field that has passed through the cooking container.

本発明によれば，磁力線を通す調理容器で調理する際，調理容器内に収納された発熱体が調理容器を通過した磁力線により発熱するので、下方からの加熱に加えて上方からの加熱を可能とし，温度ムラを低減して均一な加熱を行うことができる。   According to the present invention, when cooking in a cooking container through which magnetic lines pass, the heating element stored in the cooking container generates heat by the magnetic lines passing through the cooking container, so that heating from above is possible in addition to heating from below. Thus, uniform heating can be performed while reducing temperature unevenness.

以下、本発明に係る電磁誘導加熱調理器の好適な実施の形態について図面を用いて説明する。
実施の形態１．
図１は本発明の実施の形態１に係る電磁誘導加熱調理器の一例である炊飯器の構成を示す断面図、図２は実施の形態１における炊飯器の駆動回路を示す図である。
炊飯器の本体１内に固着された容器カバー２は、底部側の外面に電磁誘導体である加熱コイル３が配設され、底部中央に形成された孔部には温度センサ４が貫通して設けられている。また、容器カバー２のフランジ部には、例えば３箇所に凸状に形成された支持部材６が取り付けられている。この支持部材６は、後述する調理容器５を係止するためのものである。加熱コイル３は、容器カバー２の底部の外面に設けられた第１の加熱コイル３ａと、コーナー部の外面に設けられた第２の加熱コイル３ｂとでなり、各々の加熱コイル３ａ、３ｂは、スパイラル状に旋回されて直列に接続され、炊飯時に高周波電流が流れる。温度センサ４は、本体１の底部に固着された圧縮バネ４ａにより下方から支持されている。 DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of an electromagnetic induction heating cooker according to the present invention will be described with reference to the drawings.
Embodiment 1 FIG.
FIG. 1 is a cross-sectional view illustrating a configuration of a rice cooker that is an example of an electromagnetic induction heating cooker according to Embodiment 1 of the present invention, and FIG. 2 is a diagram illustrating a drive circuit for the rice cooker according to Embodiment 1.
The container cover 2 fixed inside the main body 1 of the rice cooker is provided with a heating coil 3 that is an electromagnetic derivative on the outer surface on the bottom side, and a temperature sensor 4 is provided through a hole formed in the center of the bottom. It has been. Moreover, the support member 6 formed in the convex shape, for example at three places is attached to the flange part of the container cover 2. This support member 6 is for latching the cooking container 5 mentioned later. The heating coil 3 includes a first heating coil 3a provided on the outer surface of the bottom portion of the container cover 2, and a second heating coil 3b provided on the outer surface of the corner portion. It is swirled in a spiral shape and connected in series, and a high-frequency current flows during rice cooking. The temperature sensor 4 is supported from below by a compression spring 4 a fixed to the bottom of the main body 1.

鍋状の調理容器５（カーボン焼結体）は、容器カバー２に着脱可能に収納され、前述した第１および第２の加熱コイル３ａ、３ｂの高周波電流による高周波磁界によって誘導電流（渦電流）が生じ発熱する。本体１に開閉自在に係止された外蓋９は、係止材１０で連結された内蓋７を備え、上面に操作／表示部１２が設けられている。内蓋７は、調理容器５を覆うためのもので、周縁部に配置されたシール材の蓋パッキン８により、調理容器５のフランジ部との密閉性を得ている。外蓋９の中央部に設けられた蒸気口１１は、外蓋９および内蓋７を貫通し、内蓋７側に設けられた内弁１１ａと外蓋９側に設けられた外弁１１ｂとによって構成されている。   The pot-shaped cooking container 5 (carbon sintered body) is detachably accommodated in the container cover 2 and induced current (eddy current) by the high-frequency magnetic field generated by the high-frequency currents of the first and second heating coils 3a and 3b described above. To generate heat. An outer lid 9 that is locked to the main body 1 so as to be freely opened and closed includes an inner lid 7 that is connected by a locking material 10, and an operation / display section 12 is provided on the upper surface. The inner lid 7 is for covering the cooking container 5, and has a sealing property with the flange portion of the cooking container 5 by the lid packing 8 of the sealing material arranged at the peripheral edge. The steam port 11 provided in the central portion of the outer lid 9 penetrates the outer lid 9 and the inner lid 7, and includes an inner valve 11a provided on the inner lid 7 side and an outer valve 11b provided on the outer lid 9 side. It is constituted by.

前述した加熱コイル３は、図２に示すようにインバータ回路２１と接続され、温度センサ４は、制御部２２と接続されている。インバータ回路２１の入力側には、商用電源の交流電圧を直流電圧に変換する整流回路２０が接続されている。また、外蓋９の上面に設けられた操作／表示部１２は、図示していないが、制御部２２と接続されている。   As described above, the heating coil 3 is connected to the inverter circuit 21, and the temperature sensor 4 is connected to the control unit 22. A rectifier circuit 20 that converts an AC voltage of a commercial power source into a DC voltage is connected to the input side of the inverter circuit 21. The operation / display unit 12 provided on the upper surface of the outer lid 9 is connected to the control unit 22 (not shown).

次に、実施の形態１の動作について図１、２を用いて説明する。調理物である所定量の米と米量に応じた水の入った調理容器５を容器カバー２内に収納して外蓋９を閉めると、内蓋７の蓋パッキン８が調理容器５のフランジ部に圧接され、調理容器５を密閉シールする。そして、操作／表示部１２の例えば炊飯スイッチ（図示せず）をオンして炊飯工程をスタートさせると、制御部２２は、インバータ回路２１を駆動して高周波電流を加熱コイル３ａ，３ｂに供給し、加熱コイル３ａ，３ｂに高周波磁界を発生させる。   Next, the operation of the first embodiment will be described with reference to FIGS. When a cooking container 5 containing a predetermined amount of cooked rice and water corresponding to the amount of rice is stored in the container cover 2 and the outer lid 9 is closed, the lid packing 8 of the inner lid 7 becomes the flange of the cooking container 5. The cooking container 5 is hermetically sealed. And if the rice cooking switch (not shown) of the operation / display part 12 is turned on and the rice cooking process is started, the control part 22 will drive the inverter circuit 21 and will supply high frequency current to heating coil 3a, 3b. Then, a high frequency magnetic field is generated in the heating coils 3a and 3b.

加熱コイル３ａ，３ｂと磁気結合された調理容器５の底部およびコーナ部が励磁され、渦電流が誘起される。この渦電流と調理容器５の持つ抵抗とによるジュール熱により発熱し、調理容器５内の米と水を加熱する。調理容器５は、非磁性のカーボンが使用されているため比透磁率が１であり、調理容器５への投入電力を上げるには、下記の（１）式より抵抗率ρ（Ωｍ）を高くする必要がある。   The bottom part and corner part of the cooking vessel 5 magnetically coupled to the heating coils 3a and 3b are excited, and an eddy current is induced. Heat is generated by Joule heat due to the eddy current and the resistance of the cooking vessel 5 to heat the rice and water in the cooking vessel 5. Since the non-magnetic carbon is used for the cooking container 5, the relative permeability is 1, and in order to increase the input power to the cooking container 5, the resistivity ρ (Ωm) is increased from the following equation (1). There is a need to.

Figure 2008132108
Figure 2008132108

抵抗率は、非磁性である18-8ステンレスの抵抗率（7.2×10-7 ）以上を設定することにより、カーボンでも電磁誘導加熱が可能となる。そして、この調理容器５は、抵抗率略7.2 ×10-7以上の高抵抗を有している。カーボンで構成された調理容器５は、クラッド材（AL1.7mm、SUS0.5mm ）の厚み方向の熱伝導率（87W/mK）に対して約1.3倍（113 W/mK ）の高熱伝導特性を持つため、短時間に調理容器５の温度が均一に上昇し、その結果、米に対して均一に効率よく加熱が行われる。 By setting the resistivity to a resistivity (7.2 × 10 −7 ) or more of non-magnetic 18-8 stainless steel, electromagnetic induction heating is possible even with carbon. The cooking container 5 has a high resistance of about 7.2 × 10 −7 or more. The cooking vessel 5 made of carbon has a high thermal conductivity of about 1.3 times (113 W / mK) compared to the thermal conductivity (87 W / mK) in the thickness direction of the clad material (AL 1.7 mm, SUS 0.5 mm). Therefore, the temperature of the cooking container 5 rises uniformly in a short time, and as a result, the rice is heated uniformly and efficiently.

一方、電磁誘導加熱の浸透深さは、下記の（２）式で表される。   On the other hand, the penetration depth of electromagnetic induction heating is expressed by the following equation (2).

Figure 2008132108
Figure 2008132108

浸透深さは、周波数が20kHz のとき11mmとなり、調理容器５の厚みを浸透深さ以下にすることによって加熱コイル３ａ，３ｂの磁界中の磁力線が通り抜ける。
そこで、実施の形態１においては、図３に示すように、その磁力線で発熱する発熱体１３を調理容器５内に入れて上方からも米と水を加熱させるようにしている。発熱体１３は、SUS やカーボンといった磁性材で構成され，外形が調理容器５の形状に応じて例えば円形に形成されている。 The penetration depth is 11 mm when the frequency is 20 kHz, and the lines of magnetic force in the magnetic fields of the heating coils 3a and 3b pass through by making the thickness of the cooking vessel 5 equal to or less than the penetration depth.
Therefore, in the first embodiment, as shown in FIG. 3, the heating element 13 that generates heat by the lines of magnetic force is placed in the cooking container 5 to heat the rice and water from above. The heating element 13 is made of a magnetic material such as SUS or carbon, and has an outer shape, for example, circular according to the shape of the cooking vessel 5.

例えば、SUS のクラッド材を用いた調理容器５内に水を張り、その中にSUS の磁性材からなる円形の発熱体１３をプラスチック部材（図示せず）で底上げした状態で収納して、加熱コイル３ａ、３ｂに高周波電流を供給したときの発熱体１３の温度と、炭素製（カーボン）の調理容器５内に水を張り、その中に前記の発熱体１３をプラスチック部材で底上げした状態で収納して、加熱コイル３ａ、３ｂに高周波電流を供給したときの発熱体１３の温度とをそれぞれ計測した場合、発熱体１３は、図４に示すように、SUS のクラッド材の調理容器５内に設置したときよりも、カーボン製の調理容器５内に設置したときの温度上昇が早く、調理容器５を通り抜けた磁力線の影響で発熱していることを確認できた。   For example, water is put in a cooking vessel 5 using a SUS clad material, and a circular heating element 13 made of a SUS magnetic material is stored in a state where the plastic member (not shown) is raised up and heated. With the temperature of the heating element 13 when the high frequency current is supplied to the coils 3a and 3b, water is filled in the carbon (carbon) cooking vessel 5, and the heating element 13 is raised with a plastic member in the inside. When the temperature of the heating element 13 is measured when it is stored and the high frequency current is supplied to the heating coils 3a and 3b, the heating element 13 is placed in the cooking vessel 5 made of SUS clad as shown in FIG. It was confirmed that the temperature rises faster when installed in the carbon cooking vessel 5 than when it was installed in the container, and that heat was generated due to the influence of the magnetic lines passing through the cooking vessel 5.

つまり、実施の形態１においては、調理容器５にカーボン製（カーボン焼結体）のものを使用し、その中にSUS の磁性材からなる発熱体１３を入れて炊飯した場合、加熱コイル１３ａ、１３ｂからの高周波磁界による調理容器５の底部側の発熱と、その調理容器５を通過した磁力線による発熱体１３からの発熱とにより、その間の水と米とが加熱される。   That is, in the first embodiment, when the cooking container 5 is made of carbon (carbon sintered body) and the heating element 13 made of a SUS magnetic material is put therein and cooked, the heating coil 13a, The water and rice in the meantime are heated by the heat generation at the bottom side of the cooking container 5 due to the high frequency magnetic field from 13b and the heat generation from the heating element 13 due to the lines of magnetic force that have passed through the cooking container 5.

このような発熱体１３によって，調理容器５の底部下方に位置する加熱コイル１３ａ、１３ｂによる下からの加熱に加えて，上方からの加熱も行えるので，下部から上部まで米と水を均一に加熱することが可能になり、このため、均一な炊き上がりを実現することができる。   With such a heating element 13, in addition to heating from below by the heating coils 13a and 13b located below the bottom of the cooking vessel 5, heating from above is also possible, so rice and water are heated uniformly from the bottom to the top. For this reason, uniform cooking can be realized.

実施の形態２．
実施の形態２は、炊飯時に変化する調理物の水の深さに応じて発熱体１３が変位するようにしたものである。その発熱体１３は、例えば図５に示すように、SUS の磁性材からなる発熱部１４と、その発熱部１４の外周に縁部として設けられた水よりも比重の軽い浮子部１５とからなっている。つまり、その浮子部１５は、発熱部１４を水面に浮かせる浮力を有している。 Embodiment 2. FIG.
In the second embodiment, the heating element 13 is displaced according to the water depth of the cooked food that changes during cooking. For example, as shown in FIG. 5, the heating element 13 includes a heating part 14 made of a SUS magnetic material, and a float part 15 having a lighter specific gravity than water provided as an edge on the outer periphery of the heating part 14. ing. That is, the float part 15 has a buoyancy that allows the heat generating part 14 to float on the water surface.

このように構成された発熱体１３を米と水の入った調理容器５に収納すると、その発熱体１３は、図１０に示すように、浮子部１５により水層１７の上面（水面）に浮く。この状態で炊飯をスタートした場合は、調理容器５の底部側が加熱コイル１３ａ、１３ｂからの高周波磁界による渦電流により発熱し、発熱体１３の発熱部１４が調理容器５を通過した磁力線（高周波磁界）による渦電流により発熱し、調理物の米層１６と水層１７を下方と上方とから加熱する。この加熱により、調理容器５内の水層１７が蒸気化して行くと、水位が低下し、これに伴って水面上の発熱体１３も下がっていく。その際、調理容器５を通過した磁力線も強くなって発熱部１４に生じる渦電流が当初よりも大きくなり、発熱体１３の発熱部１４に発生する熱が高くなっていく。   When the heating element 13 configured in this manner is stored in the cooking container 5 containing rice and water, the heating element 13 floats on the upper surface (water surface) of the water layer 17 by the float 15 as shown in FIG. . When rice cooking is started in this state, the bottom side of the cooking vessel 5 generates heat due to the eddy current due to the high frequency magnetic field from the heating coils 13a and 13b, and the heating line 14 of the heating element 13 passes through the cooking vessel 5 (high frequency magnetic field). ), The rice layer 16 and the water layer 17 of the cooked food are heated from below and above. When the water layer 17 in the cooking container 5 is vaporized by this heating, the water level is lowered, and the heating element 13 on the water surface is lowered accordingly. At this time, the lines of magnetic force that have passed through the cooking container 5 are also strengthened, and the eddy current generated in the heat generating part 14 becomes larger than the original, and the heat generated in the heat generating part 14 of the heat generating element 13 increases.

以上のように実施の形態２によれば、水よりも比重の軽い浮子部１５を有する発熱体１３を調理容器５内の水層１７に浮かして炊飯するようにしたので、水層１７の蒸気化による水位低下につれ発熱体１３の発熱部１４から発せられる熱が徐々に高くなり、このため、調理物への加熱を効率的に行うことができる。また、発熱体１３で水層１７の上面を覆っているため、加熱時の放熱を抑えることができ、省エネに繋がるという効果がある。   As described above, according to the second embodiment, the heating element 13 having the float part 15 having a specific gravity lighter than water is floated on the water layer 17 in the cooking vessel 5 and cooked. As the water level decreases due to the conversion, the heat generated from the heat generating portion 14 of the heat generating element 13 gradually increases, and therefore, the food can be efficiently heated. Moreover, since the upper surface of the water layer 17 is covered with the heating element 13, heat radiation during heating can be suppressed, and there is an effect of energy saving.

なお、発熱体１３を水層１７の上面に浮くようにしたが、例えば図１１に示すように、水層１７の中に発熱体１３が浮くようにしてもよい。
このように発熱体１３が水層１７の中に浮くようにした場合、加熱時に最も温度差のある水層１７の中央部分を発熱部１４で加熱することができ、より効率よく均一に加熱することが可能になる。 In addition, although the heat generating body 13 was made to float on the upper surface of the water layer 17, you may make it the heat generating body 13 float in the water layer 17 as shown, for example in FIG.
When the heating element 13 floats in the water layer 17 as described above, the central portion of the water layer 17 having the most temperature difference at the time of heating can be heated by the heating unit 14, and more efficiently and uniformly heated. It becomes possible.

実施の形態３．
実施の形態３は、例えば、図６に示すように外形が円板状に形成され、その内部が空洞になっている発熱体１３を備えたものである（図７参照）。この発熱体１３は、SUS の磁性材からなり、内部の空洞により発熱体１３そのものが水に浮くようになっている。 Embodiment 3 FIG.
The third embodiment includes, for example, a heating element 13 whose outer shape is formed in a disk shape as shown in FIG. 6 and whose inside is hollow (see FIG. 7). The heating element 13 is made of a SUS magnetic material, and the heating element 13 itself floats in water due to an internal cavity.

このように構成された発熱体１３を米と水の入った調理容器５に収納すると、発熱体１３は、内部の空洞により調理容器１３内の水層１７の上面に浮く。この状態で炊飯をスタートした場合は、調理容器５の底部側が加熱コイル１３ａ、１３ｂからの高周波磁界による渦電流により発熱し、発熱体１３が調理容器５を通過した磁力線による渦電流により発熱し、調理物の米層１６と水層１７を下方と上方とから加熱する。この加熱により、調理容器５内の水層１７が蒸気化して行くと、水位が低下し、これに伴って水面上の発熱体１３も下がっていく。その際、調理容器５を通過した磁力線も強くなって渦電流が当初よりも大きくなり、発熱体１３に発生する熱が高くなっていく。   When the heating element 13 configured in this manner is stored in the cooking container 5 containing rice and water, the heating element 13 floats on the upper surface of the water layer 17 in the cooking container 13 due to the internal cavity. When cooking rice in this state, the bottom side of the cooking vessel 5 generates heat due to eddy currents caused by the high-frequency magnetic field from the heating coils 13a and 13b, and the heating element 13 generates heat due to eddy currents caused by magnetic lines passing through the cooking vessel 5, The rice layer 16 and the water layer 17 of the cooked product are heated from below and above. When the water layer 17 in the cooking container 5 is vaporized by this heating, the water level is lowered, and the heating element 13 on the water surface is lowered accordingly. At that time, the lines of magnetic force that have passed through the cooking vessel 5 become stronger, the eddy current becomes larger than the original, and the heat generated in the heating element 13 increases.

以上のように実施の形態３によれば、内部が空洞の発熱体１３を調理容器５内の水層１７に浮かして炊飯するようにしたので、水層１７の蒸気化による水位低下につれ発熱体１３から発せられる熱が徐々に高くなり、このため、調理物への加熱を効率的に行うことができる。また、発熱体１３で水層１７の上面を覆っているため、加熱時の放熱を抑えることができ、省エネに繋がるという効果がある。   As described above, according to the third embodiment, since the heating element 13 having a hollow inside is floated on the water layer 17 in the cooking vessel 5 and cooked, the heating element is generated as the water level decreases due to the vaporization of the water layer 17. The heat generated from 13 gradually increases, so that the food can be efficiently heated. Moreover, since the upper surface of the water layer 17 is covered with the heating element 13, heat radiation during heating can be suppressed, and there is an effect of energy saving.

なお、発熱体１３を水層１７の上面に浮くようにしたが、例えば図１１に示すように、水層１７の中に発熱体１３が浮くようにしてもよい。
このように発熱体１３が水層１７の中に浮くようにした場合、加熱時に最も温度差のある水層１７の中央部分を発熱体１３で加熱することができ、より効率よく均一に加熱することが可能になる。 In addition, although the heat generating body 13 was made to float on the upper surface of the water layer 17, you may make it the heat generating body 13 float in the water layer 17 as shown, for example in FIG.
When the heating element 13 floats in the water layer 17 as described above, the central portion of the water layer 17 having the most temperature difference at the time of heating can be heated by the heating element 13 and more efficiently and uniformly heated. It becomes possible.

実施の形態４．
実施の形態４は、発熱体１３の中央部の厚みを外周縁部よりも厚く形成したものである。例えば図８に示すように、一方の面が凸状に形成され、SUS の磁性材からなる円形状の発熱部１４と、発熱部１４の外周に縁部として設けられた浮子部１５とからなっている。その浮子部１５は、発熱部１４を水面に浮かせる浮力を有している。 Embodiment 4 FIG.
In the fourth embodiment, the thickness of the central portion of the heating element 13 is made thicker than the outer peripheral edge. For example, as shown in FIG. 8, one surface is formed in a convex shape, and includes a circular heat generating portion 14 made of a SUS magnetic material, and a floating portion 15 provided as an edge on the outer periphery of the heat generating portion 14. ing. The float 15 has a buoyancy that allows the heat generating part 14 to float on the water surface.

このように構成された発熱体１３を米と水の入った調理容器５に収納する際、凸状側を米層１６に向けて入れる。発熱部１４を凸状に形成した場合、平らな発熱部１４（実施の形態２）と比べ熱容量が大きくなるので、より効率的に均一に加熱することができる。また、発熱体１３で水層１７の上面を覆っているため、加熱時の放熱を抑えることができ、省エネに繋がるという効果がある。   When the heating element 13 configured in this way is stored in the cooking container 5 containing rice and water, the convex side is put toward the rice layer 16. When the heat generating part 14 is formed in a convex shape, the heat capacity is larger than that of the flat heat generating part 14 (Embodiment 2), so that heating can be performed more efficiently and uniformly. Moreover, since the upper surface of the water layer 17 is covered with the heating element 13, heat radiation during heating can be suppressed, and there is an effect of energy saving.

なお、発熱体１３を水層１７の上面に浮くようにしたが、図１１に示すように、水層１７の中に発熱体１３が浮くようにしてもよい。
このように発熱体１３が水層１７の中に浮くようにした場合、加熱時に最も温度差のある水層１７の中央部分を発熱部１４で加熱することができ、より効率よく均一に加熱することが可能になる。 In addition, although the heat generating body 13 was made to float on the upper surface of the water layer 17, you may make it the heat generating body 13 float in the water layer 17, as shown in FIG.
When the heating element 13 floats in the water layer 17 as described above, the central portion of the water layer 17 having the most temperature difference at the time of heating can be heated by the heating unit 14, and more efficiently and uniformly heated. It becomes possible.

また、発熱部１４の一方の面を凸状にしたことを述べたが、両面を凸状にして水層１７の上面に、又はその中に浮くようにしてもよい。この構成により、一方の面のみを凸状にした発熱部１４と比べ、さらに熱容量が大きくなるので、より効率的に均一に加熱することができる。   Moreover, although it described that the one surface of the heat generating part 14 was made convex, you may make it float on the upper surface of the water layer 17 by making both surfaces convex. With this configuration, since the heat capacity is further increased as compared with the heat generating part 14 having only one surface convex, heating can be performed more efficiently and uniformly.

実施の形態５．
実施の形態４では、一方の面が凸状に形成された発熱部１４を浮子部１５で水層１７の上面に浮かせるようにしたが、実施の形態５は、浮子部１５を用いることなく断面形状を図８と同じように形成し、その中を空洞にして水層１７の上面に浮くようにした発熱体１３（SUS の磁性材）を備えたものである。このように構成した場合、平らな発熱体１３（実施の形態３）と比べ、凸状の発熱体１３からの熱伝達がよくなるので、より効率的に均一に加熱することができる。 Embodiment 5. FIG.
In the fourth embodiment, the heat generating portion 14 having one surface formed in a convex shape is floated on the upper surface of the water layer 17 by the floating portion 15, but the fifth embodiment has a cross section without using the floating portion 15. 8 is provided with a heating element 13 (SUS magnetic material) that is formed in the same manner as in FIG. 8 and that floats on the upper surface of the water layer 17. When configured in this manner, heat transfer from the convex heating element 13 is improved as compared with the flat heating element 13 (Embodiment 3), so that heating can be performed more efficiently and uniformly.

なお、発熱体１３を水層１７の上面に浮くようにしたが、図１１に示すように、水層１７の中に発熱体１３が浮くようにしてもよい。
このように、一方の面が凸状に形成された発熱体１３を水層１７の中に浮くようにした場合、加熱時に最も温度差のある水層１７の中央部分を発熱体１３で加熱することができ、より効率よく均一に加熱することが可能になる。 In addition, although the heat generating body 13 was made to float on the upper surface of the water layer 17, you may make it the heat generating body 13 float in the water layer 17, as shown in FIG.
As described above, when the heating element 13 having one surface formed in a convex shape is floated in the water layer 17, the heating element 13 heats the central portion of the water layer 17 having the most temperature difference during heating. It becomes possible to heat more efficiently and uniformly.

また、発熱体１３の一方の面を凸状に形成したことを述べたが、両面を凸状にして水層１７の上面に、又はその中に浮くようにしてもよい。この構成により、一方の面のみを凸状にした発熱体１３と比べ、さらに熱容量が大きくなるので、より効率的に均一に加熱することができる。   Moreover, although it described that the one surface of the heat generating body 13 was formed in convex shape, you may make it float on the upper surface of the water layer 17 by making both surfaces convex. With this configuration, since the heat capacity is further increased as compared with the heating element 13 having only one surface convex, heating can be performed more efficiently and uniformly.

実施の形態６．
実施の形態６における発熱体１３は、SUS の磁性材からなり、例えば図９に示すように、外形が円板状に形成され、その面に多数の貫通孔１３ａが設けられている。これら貫通孔１３ａは、炊飯時に起こる底部からの熱水および気泡の対流によって形成される対流経路を確保するためのものである。
実施の形態６においては、米と水の入った調理容器５内に発熱体１３を入れた場合、発熱体１３は、図１２に示すように水に沈んで米層１６の上面で止まる。この状態で炊飯をスタートした場合、その発熱体１３は、前述したように調理容器５を通過した磁力線による電磁誘導によって発熱するので、予熱工程において米の温度を素早く上昇させ、吸水を促す。そして、炊飯工程では、発熱体１３に設けられた多数の貫通穴１３ａにより対流経路が確保されるので、炊き上がり時には、ご飯上に「かに穴」が作られる。 Embodiment 6 FIG.
The heating element 13 in the sixth embodiment is made of a magnetic material of SUS. For example, as shown in FIG. 9, the outer shape is formed in a disk shape, and a large number of through holes 13a are provided on the surface. These through-holes 13a are for ensuring a convection path formed by convection of hot water and bubbles from the bottom that occurs during rice cooking.
In the sixth embodiment, when the heating element 13 is put in the cooking container 5 containing rice and water, the heating element 13 sinks into water and stops on the upper surface of the rice layer 16 as shown in FIG. When rice cooking is started in this state, the heating element 13 generates heat due to electromagnetic induction by the magnetic field lines that have passed through the cooking container 5 as described above. Therefore, in the preheating step, the temperature of the rice is quickly raised to promote water absorption. And in a rice cooking process, since a convection path | route is ensured by many through-holes 13a provided in the heat generating body 13, a "crab hole" is made on rice at the time of cooking.

以上のように米層１６と水層１７との境目に発熱体１３を配置するようにしたので、温度ムラの低減が可能になり、効率的に均一に加熱することができるという効果がある。   As described above, since the heating element 13 is arranged at the boundary between the rice layer 16 and the water layer 17, temperature unevenness can be reduced, and there is an effect that heating can be performed efficiently and uniformly.

前記の実施の形態では、発熱体１３を米層１６の上面に配置したが、発熱体１３を米層１６の中に配置するようにしても良い。このように、発熱体１３を米層１６の中に配置した場合、予熱工程において米の温度を素早く上昇させて吸水を促すことができ、効率的に均一に加熱することが可能になる。
また、前述した各実施の形態では、発熱体１３にSUS の磁性材を用いたことを述べたが、これに代えてカーボンの磁性材で発熱体１３を構成するようにしてもよい。また、熱伝導を向上するため，SUS の磁性材とALの熱伝導の良い金属とでなるクラッド材で発熱体１３を構成するようにしてもよい。
カーボンやクラッド材でなる発熱体１３を用いた場合でも、前述したように調理容器５を通過した磁力線により発熱するので、下方からの加熱に加えて上方からの加熱を可能とし，温度ムラを低減して均一な加熱を行うことができる。 In the above embodiment, the heating element 13 is arranged on the upper surface of the rice layer 16, but the heating element 13 may be arranged in the rice layer 16. Thus, when the heat generating body 13 is arrange | positioned in the rice layer 16, the temperature of rice can be raised quickly in a preheating process, water absorption can be promoted, and it becomes possible to heat uniformly efficiently.
In each of the above-described embodiments, the SUS magnetic material is used for the heating element 13. However, instead of this, the heating element 13 may be made of a carbon magnetic material. Further, in order to improve heat conduction, the heating element 13 may be made of a clad material made of a SUS magnetic material and a metal having good heat conduction of AL.
Even when the heating element 13 made of carbon or clad material is used, heat is generated by the lines of magnetic force that have passed through the cooking vessel 5 as described above, so that heating from above is possible in addition to heating from below, and temperature unevenness is reduced. And uniform heating can be performed.

本発明の実施の形態１に係る電磁誘導加熱調理器の一例である炊飯器の構成を示す断面図である。It is sectional drawing which shows the structure of the rice cooker which is an example of the electromagnetic induction heating cooking appliance which concerns on Embodiment 1 of this invention. 実施の形態１における炊飯器の駆動回路を示す図である。It is a figure which shows the drive circuit of the rice cooker in Embodiment 1. FIG. 調理容器に発熱体を収納して示す外観斜視図である。It is an external appearance perspective view which accommodates and shows a heat generating body in a cooking container. 実施の形態１における発熱体の温度上昇特性図である。FIG. 4 is a temperature rise characteristic diagram of the heating element in the first embodiment. 実施の形態２における発熱体の外観を示す斜視図である。FIG. 6 is a perspective view showing an appearance of a heating element in a second embodiment. 実施の形態３における発熱体の外観を示す斜視図である。FIG. 10 is a perspective view showing an appearance of a heating element in a third embodiment. 図６におけるＡ−Ａの断面図である。It is sectional drawing of AA in FIG. 実施の形態４における発熱体の断面図である。6 is a cross-sectional view of a heating element in Embodiment 4. FIG. 実施の形態４における発熱体の外観を示す斜視図である。FIG. 10 is a perspective view showing an appearance of a heating element in a fourth embodiment. 調理容器内の水層面に発熱体を浮かして示す断面図である。It is sectional drawing which floats and shows a heat generating body on the water layer surface in a cooking vessel. 調理容器内の水層の中に発熱体を浮かして示す断面図である。It is sectional drawing which floats and shows a heat generating body in the water layer in a cooking container. 調理容器内の米層の上面に発熱体を配置して示す断面図である。It is sectional drawing which arrange | positions and shows a heat generating body on the upper surface of the rice layer in a cooking container.

符号の説明Explanation of symbols

１ 本体、２ 容器カバー、３ａ，３ｂ 加熱コイル、５ 調理容器、７ 内蓋、
９ 外蓋、１３ 発熱体、１３ａ 貫通穴、１４ 発熱部、１５ 浮子部、１６ 米層、１７ 水層。 1 body, 2 container cover, 3a, 3b heating coil, 5 cooking container, 7 inner lid,
9 outer lid, 13 heating element, 13a through hole, 14 heating part, 15 floater, 16 rice layer, 17 water layer.

Claims (8)

インバータ回路からの高周波電流により磁界を発生する電磁誘導体と、
磁力線を通し、前記電磁誘導体の磁界による渦電流により発熱し、内部の調理物を加熱する調理容器と、
該調理容器内に着脱可能に収納され、その調理容器を通過した磁界からの磁力線による渦電流により発熱する発熱体と
を備えたことを特徴とする電磁誘導加熱調理器。 An electromagnetic derivative that generates a magnetic field by high-frequency current from the inverter circuit;
A cooking container that heats the food inside by passing through the magnetic field lines and generating heat by eddy current due to the magnetic field of the electromagnetic derivative,
An electromagnetic induction heating cooker comprising: a heating element that is detachably housed in the cooking container and generates heat by eddy current due to a magnetic field line from a magnetic field that has passed through the cooking container. 前記発熱体は、ステンレスの磁性材からなっていることを特徴とする請求項１記載の電磁誘導加熱調理器。   The electromagnetic induction heating cooker according to claim 1, wherein the heating element is made of a stainless steel magnetic material. 前記発熱体は、カーボンを主体とする磁性材からなっていることを特徴とする請求項１記載の電磁誘導加熱調理器。   The electromagnetic induction heating cooker according to claim 1, wherein the heating element is made of a magnetic material mainly composed of carbon. 前記発熱体は、ステンレスの磁性材およびアルミの非磁性材からなるクラッド材で構成されていることを特徴とする請求項１記載の電磁誘導加熱調理器。   The electromagnetic induction heating cooker according to claim 1, wherein the heating element is made of a clad material made of a stainless steel magnetic material and an aluminum nonmagnetic material. 前記発熱体は、外周縁部に水よりも比重の軽い部材が設けられ、前記調理容器内の調理物のうち水面あるいは水の中に浮くようにしたことを特徴とする請求項１乃至４の何れかに記載の電磁誘導加熱調理器。   5. The heating element according to claim 1, wherein a member having a lighter specific gravity than water is provided on an outer peripheral edge of the heating element, and the heating element floats on the water surface or in water of the cooked food in the cooking container. The electromagnetic induction heating cooking appliance in any one. 前記発熱体は、内部が空洞に形成され、前記調理容器内の調理物のうち水面あるいは水の中に浮くようにしたことを特徴とする請求項１乃至４の何れかに記載の電磁誘導加熱調理器。   5. The electromagnetic induction heating according to claim 1, wherein the heating element has a hollow interior and is floated on the water surface or in water of the cooked food in the cooking container. 6. Cooking device. 前記発熱体は，中央部の厚みが外周縁部よりも厚く形成されていることを特徴とする請求項１乃至６の何れかに記載の電磁誘導加熱調理器。   The electromagnetic induction heating cooker according to any one of claims 1 to 6, wherein the heating element has a central portion formed thicker than an outer peripheral edge portion. 前記発熱体は、複数の貫通穴が設けられ、前記調理容器内の調理物のうち内容物の上面に配置したことを特徴とする請求項１乃至４の何れかに記載の電磁誘導加熱調理器。   5. The electromagnetic induction heating cooker according to claim 1, wherein the heating element is provided with a plurality of through holes, and is disposed on an upper surface of the contents of the cooked food in the cooking container. .
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EP3616573A4 (en) * 2017-04-26 2020-09-16 LG Electronics Inc. -1- Smart kettle using induction heating

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JP2017529650A (en) * 2014-07-25 2017-10-05 アルプス・サウス・ユーロプ・スポレチノスト・ス・ルチェニーム・オメゼニームＡｌｐｓ Ｓｏｕｔｈ Ｅｕｒｏｐｅ Ｓ．Ｒ．Ｏ． Induction heaters for shaving and cosmetic products
EP3616573A4 (en) * 2017-04-26 2020-09-16 LG Electronics Inc. -1- Smart kettle using induction heating
US11957265B2 (en) 2017-04-26 2024-04-16 Lg Electronics Inc. Smart kettle using induction heating

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