JP2007075506A - Vessel for electromagnetic induction heating cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inexpensively provide a vessel for an electromagnetic induction heating cooker which can be heated efficiently. <P>SOLUTION: On the outer wall surface 10B of an inner pot 10, heat generating layers 12A, 12B and 12C are provided only in areas corresponding to three heating coils 23A, 23B and 23C. Thus, the inner pot 10 can be heated efficiently with irreducibly minimum heat generating layers 12. Moreover, a using quantity of conductive material which becomes material of the heat generating layers 12 can be reduced to be irreducibly minimum to reduce costs for manufacturing. The thicknesses of the heat generating layers 12A, 12B and 12C are made thinner with the increase of the output of corresponding heating coils 23A, 23B and 23C. Thus, a calorific value is averaged, and overheating of a specific heat generating layer 12 is avoided. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a container for an electromagnetic induction heating cooker.

  An electromagnetic induction heating cooker (IH cooker) generates lines of magnetic force by energizing a heating coil formed in an annular shape, and causes an eddy current to flow to the bottom of the pan by electromagnetic induction, causing the pan itself to generate heat. Is used to heat food. Therefore, in order to cook using this IH cooker, it is usually necessary to use a metal pan having conductivity. However, in cooking, it may be preferable to use a pot made of a non-conductive material such as a clay pot in terms of flavor and heat retention.

Then, the thing of patent document 1 is proposed as a clay pot which can be used for an IH cooking device, for example. In this structure, a heat generating layer (thin film metal film layer) is formed of a conductive material on the bottom of a clay pot, and heating is performed when the heat generating layer generates heat.
Registered Utility Model No. 3096191

  By the way, also in the inner pot for IH rice cookers, there is a demand to use a non-conductive material such as ceramic from the viewpoint of heat retention.

  However, in the IH rice cooker, the heating coil is provided at a plurality of locations including not only the bottom surface but also the side surface for the purpose of causing convection in the entire interior of the inner pot to suppress uneven cooking and uniformly cooking. There are many. In order to correspond to the rice cooker having such a configuration, it is necessary to provide a heat generating layer on the entire outer wall surface including the side surface portion of the inner pot, which increases costs.

  This invention is made | formed in view of an above-described situation, The objective is to provide the container for electromagnetic induction heating cooking appliances which can perform efficient heating at low cost.

  A container for an electromagnetic induction heating cooker according to the invention of claim 1 for solving the above-mentioned problem is provided on a container body made of a non-conductive material and a conductive material and on an outer wall surface of the container body. And a heating layer for generating heat by electromagnetic induction from a plurality of heating coils provided in the electromagnetic induction heating cooker, wherein the plurality of heating layers are disposed outside the container body. It is provided in the area | region corresponding to the arrangement | positioning position of these heating coils in the wall surface.

  Invention of Claim 2 is a container for electromagnetic induction heating cooking appliances of Claim 1, Comprising: The thickness of the said some heat_generation | fever layer is made so thin that the output of the heating coil corresponding to the heat_generation | fever layer is high It is characterized by that.

  According to the first aspect of the present invention, in the electromagnetic induction heating cooker container, the plurality of heat generating layers are provided in a region corresponding to the arrangement positions of the plurality of heating coils on the outer wall surface of the container main body. Here, the magnetic flux density of the lines of magnetic force generated by energization of the heating coil is not uniform over the entire outer wall surface of the container, and the temperature hardly rises even if a heating layer is provided at a position away from the heating coil. For this reason, in this invention, it decided to provide a heat-generating layer only in the area | region corresponding to a heating coil in the outer wall surface of a container. Thereby, it can heat efficiently with the heat generation layer of the minimum necessary, and can reduce manufacturing cost.

  According to the invention of claim 2, the thickness of the plurality of heat generating layers is made thinner as the output of the heating coil corresponding to the heat generating layer is higher. Here, in the electromagnetic induction heating type cooker, there is a limit to adding an inverter circuit that supplies power to the heating coil due to the restriction that all parts must be stored in a predetermined space in the main body. It is often difficult to control all heating coils individually. Therefore, in the present invention, the thickness is changed according to the output of the corresponding heating coil on the heat generating layer side, and the heat generating layer is made thinner as the output of the corresponding heating coil is larger. Thereby, the calorific value can be averaged over the entire container, and the necessary heat can be distributed throughout the container, and overheating of a specific heat generation layer can be avoided.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments embodying the present invention will be described in detail with reference to FIGS. 1 and 2. In this embodiment, the present invention is applied to an inner pot for an electromagnetic induction heating type rice cooker (IH rice cooker). FIG. 1 is a perspective view of an inner pot 10 according to the present embodiment (corresponding to the container for an electromagnetic induction heating cooker of the present invention) viewed from the bottom, and FIG. 2 shows the inner pot 10 of the present embodiment as IH. The schematic sectional side view which shows a mode that it set to the rice cooker main body 20 of the rice cooker 1 (it corresponds to the electromagnetic induction heating cooking appliance of this embodiment) was shown.

  The rice cooker body 20 of the IH rice cooker 1 has a well-known configuration that is formed as a bottomed cylindrical container that opens upward as a whole and that can accommodate the inner pot 10 therein. In the bottom wall inner surface 21 of the rice cooker main body 20, the peripheral edge portion (the connection portion with the side wall inner surface 22) has a gentle arc that is concave in the outer surface direction (downwardly obliquely) of the rice cooker main body 20 when viewed from the side. The bottom slope portion 21A rises toward the outer periphery while drawing. Moreover, the cover part (not shown) of the well-known structure which covers the opening of the rice cooker main body 20 so that opening and closing is possible is attached to the upper part of the rice cooker main body 20 via the hinge, for example.

  In the wall portion of the rice cooker body 20, three heating coils 23 for generating a magnetic force and a high-frequency inverter 24 for controlling the output of the heating coil 23 are arranged. Of the three heating coils 23, the first heating coil 23 </ b> A is formed by winding a wire in a spiral shape to form a flat donut as a whole, and the bottom of the bottom wall portion 25 of the rice cooker body 20 is the bottom. It is arranged at a position corresponding to the central portion 21B which is a region inside the slope portion 21A. The second heating coil 23B is formed as a flat donut having an inner diameter larger than the outer diameter of the first heating coil 23A as a whole by winding a wire in a spiral shape. The heating coil 23A is arranged concentrically. The second heating coil 23B is arranged at a position corresponding to the bottom slope portion 21A, and outwards in the radial direction while drawing an arc along the bottom slope portion 21A from the inner peripheral edge side toward the outer peripheral edge side. It has an upward slope. The third heating coil 23 </ b> C is formed in a tubular shape as a whole by winding a wire in a spiral shape, and is disposed at a substantially central position in the vertical direction on the side wall portion 26 of the rice cooker body 20. ing.

  These heating coils 23 are connected to a high frequency inverter 24. Both the first heating coil 23A and the second heating coil 23B are connected to the first high-frequency inverter 24A, and output control is performed together. On the other hand, the third heating coil 23C is connected to a second high-frequency inverter 24B different from the first high-frequency inverter 24A, and is output independently from the first heating coil 23A and the second heating coil 23B. Can be controlled.

  The inner pot 10 accommodated in the rice cooker body 20 includes a ceramic pot body 10A and a heat generating layer 12 provided on the outer wall surface 10B of the pot body 10A. The main body 10 </ b> A is formed in a shape along the inner wall surface (the bottom wall inner surface 21 and the side wall inner surface 22) of the rice cooker body 20 as a whole. That is, it is formed in the shape of a cylindrical container with a bottom that opens upward as a whole. It has a round bottom shape that is a bottom slope portion 11A that rises in the outer peripheral direction while drawing a gentle arc that is concave.

  On the outer wall surface 10B of the hook main body 10A, for example, thin plate-like heat generating layers 12 formed of a metal such as silver, aluminum, or iron (corresponding to the conductive material of the present invention) are provided at three locations. The three heat generating layers 12 are provided at positions aligned with the three heating coils 23A, 23B, and 23C when the inner pot 10 is set in the rice cooker main body 20, respectively.

  That is, the first heat generating layer 12A is formed in a flat donut shape having an outer diameter and an inner diameter substantially equal to the outer diameter and the inner diameter of the first heating coil 23A. It is arranged in the central portion 11B, which is a region inside 11A. The second heat generating layer 12B is formed in a flat donut shape having an outer diameter and an inner diameter substantially equal to the outer diameter and the inner diameter of the second heating coil 23B, and is formed on the bottom slope portion 11A of the inner pot 10. The first heat generating layer 12A is disposed concentrically. The third heat generating layer 12C is formed in a cylindrical shape having a height substantially equal to the height of the third heating coil 23C, and is substantially at the center position in the vertical direction on the side wall portion 13 of the hook body 10A. Has been placed. Such a heat generating layer 12 is formed, for example, by sticking a thin film previously formed in a desired shape to the outer wall surface 10B of the hook body 10A with a heat-resistant ceramic adhesive or the like, as in the above embodiments. It can also be formed by screen printing, thermal spraying, transfer printing, or the like. In particular, the transfer printing method is suitable for obtaining the heat generating layer 12 exhibiting a stable heating power because the heat generating layer 12 can be made uniform in thickness and weight and finely controlled.

  In the second heat generating layer 12B, a recess 14 formed in an annular shape concentric with the heat generating layer 12B is provided over the entire circumference in a region from the outer peripheral position slightly from the inner peripheral edge to the inner peripheral position slightly from the outer peripheral edge. It has been. Thereby, the area | region in which this recessed part 14 was formed is made into the low heat_generation | fever area | region where the thickness of the heat generating layer 12B is smaller than a peripheral area | region. What is necessary is just to set the formation position of the recessed part 14 according to the area | region where the emitted-heat amount is the largest in the heat_generation | fever layer 12B, and should just set suitably with the model of the IH rice cooker 1. FIG.

  Further, by changing the thickness of the three heat generation layers 12 according to the outputs of the three heating coils 23, the amount of heat generation is adjusted to control the heating. That is, in the IH rice cooker 1 of the present embodiment, the first heating coil 23A and the second heating coil 23B are connected to a common high-frequency inverter 24A and controlled together. In such a configuration, it is impossible to individually control the outputs of the heating coils 23A and 23B in accordance with the progress of rice cooking, and in many cases, both the heating coils 23A and 23B should have the necessary outputs. Then, the output of the first heating coil 23A on the center side tends to be excessive. Therefore, the thickness of the first heat generating layer 12A is set to be larger than the thickness of the second heat generating layer 12B (the thickness of the portion where the concave portion 14 is not provided for the heat generating layer 12B is a standard thickness). It is thin. The third heating coil 23C is connected to another high-frequency inverter 24B and can be individually controlled, but the output is smaller than that of the first heating coil 23A and the second heating coil 23B. It is usually designed. Therefore, the thickness of the third heat generating layer 12C is set to the thickness of the first heat generating layer 12A and the thickness of the second heat generating layer 12B (standard thickness, that is, the thickness of the portion where the recess 14 is not provided). It is thicker than. In this way, by varying the thickness of the three heat generating layers 12 from each other, the amount of heat generated is averaged, the necessary heat is distributed throughout the inner pot 10, and overheating of a specific heat generating layer 12 is avoided. To be.

  When cooking rice using the IH rice cooker 1 configured as described above, rice and water (not shown) are put into the inner pot 10 and set in the rice cooker body 20, and the lid portion. Close. And when the switch of IH rice cooker 1 is turned on, a line of magnetic force is generated by passing a current from high-frequency inverter 24 to heating coil 23. Then, when the lines of magnetic force flow in the heat generating layer 12 of the inner pot 10, an eddy current is generated, and the heat generating layer 12 generates heat. This heat is transmitted to the inside of the inner pot 10 so that rice is cooked.

  Here, the magnetic flux density of the lines of magnetic force generated by energization of the heating coil 23 is not uniform over the entire outer wall surface 10B of the hook body 10A, and the temperature hardly increases even if the heating layer 12 is provided at a position away from the heating coil 23. Therefore, the heat generating layers 12A, 12B, and 12C are provided only in regions corresponding to the positions where the three heating coils 23A, 23B, and 23C are provided on the outer wall surface 10B of the inner pot 10. Thereby, it can heat efficiently with the heat generating layer 12 of the minimum necessary. Moreover, the usage-amount of the electroconductive material used as the raw material of the heat generating layer 12 can be made into the minimum necessary level, and the manufacturing cost can be reduced.

  Furthermore, the thickness of the heat generating layers 12A, 12B, and 12C is made thinner as the output of the corresponding heating coils 23A, 23B, and 23C is higher. That is, in consideration of the fact that the heat generation layer 12 increases in heat generation as the thickness thereof increases, the heat generation layer 12A provided at the position corresponding to the heating coil 23A having the highest output is formed thinnest, and then the output is high. The heat generating layer 12B corresponding to the heating coil 23B is formed thicker than the heat generating layer 12A, and the heat generating layer 12C corresponding to the heating coil 23C having the lowest output is formed thicker than the heat generating layers 12A and 12B. As a result, the heat generation amounts of the three heat generating layers 12A, 12B, and 12C are averaged, and it is possible to avoid partial overheating while spreading the necessary heat throughout the inner pot 10. In particular, in a general electromagnetic induction heating type cooking device, there is a limit to adding an inverter circuit that supplies power to the heating coil due to the restriction that all parts must be stored in a predetermined space in the main body. It is difficult to control all the heating coils individually. Therefore, also in the IH rice cooker 1 of this embodiment, the two heating coils 23A and 23B on the bottom wall portion 25 side are controlled by one high-frequency inverter 24A. In such a case, since it is difficult to balance the outputs of the two heating coils 23A and 23B, the thickness of the corresponding two heat generating layers 12A and 12B is changed, and the amount of heat generated on the heat generating layers 12A and 12B side. To adjust. As a result, the heat generation amounts of the two heat generation layers 12A and 12B can be averaged to ensure the necessary heat generation amount and to avoid overheating in either one.

The technical scope of the present invention is not limited by the above-described embodiments, and, for example, those described below are also included in the technical scope of the present invention. In addition, the technical scope of the present invention extends to an equivalent range.
(1) In this embodiment, although the example which applied this invention to the inner pot for electromagnetic induction heating type rice cookers (IH rice cooker) was shown, the application range of this invention is not restricted to the said embodiment, For example, the present invention can be applied to a clay pot for a cooking heater having a plurality of heating coils.
(2) In this embodiment, the IH rice cooker 1 is provided with the three-stage heating coil 23, but the number of stages of the heating coil is not particularly limited, and may be two or less or four or more. . Further, the number of heat generating layers 12 is not limited to the above embodiment, and may be provided in accordance with the number of heating coils.
(3) In the present embodiment, the concave portion 14 is provided in the heat generating layer 12B corresponding to the bottom slope portion 11A of the inner hook 10, but the concave portion is not necessarily provided, and the heat generating layer has a uniform thickness as a whole. May be used.

The perspective view which looked at the inner pot for IH rice cookers in this embodiment from the bottom face direction The schematic sectional side view which shows a mode that the inner pot for IH rice cookers of this embodiment was set to the main body of IH rice cooker.

Explanation of symbols

1 ... IH rice cooker (electromagnetic induction cooker)
10 ... Inner pot (container for electromagnetic induction heating cooker)
10A ... Pot body (container body)
10B ... Outer wall surfaces 12A, 12B, 12C ... Heat generation layers 23A, 23B, 23C ... Heating coil

Claims (2)

A container body made of a non-conductive material, and heat generated by electromagnetic induction from a plurality of heating coils made of a conductive material and provided on the outer wall surface of the container body and provided in an electromagnetic induction heating cooker A container for an electromagnetic induction heating cooker comprising a layer,
A container for an electromagnetic induction heating cooker, wherein a plurality of the heat generating layers are provided in a region corresponding to a position where the plurality of heating coils are disposed on an outer wall surface of the container main body.   The container for an electromagnetic induction heating cooker according to claim 1, wherein the thickness of the plurality of heating layers is reduced as the output of the heating coil corresponding to the heating layer is higher.

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