JPH07296963A - Electromagnetic cooking vessel with safety mechanism - Google Patents

Abstract

PURPOSE:To provide a vessel for electromagnetic cooking at a low cost with safety. CONSTITUTION:A conductive heat emitting body 60 in the form of a thin film is attached to the inside bottom of a nonconductive vessel body 11 accommodating a material to be cooked, which is heated with Joule's heat loss of an eddy current 51 generated at electromagnetic cooking in the direction along the surface of the heat emitting body 60. A bleeder part 70 is opened near the center of the heat emitting body 60, and a plurality of narrow parts 80 are formed between the periphery of the bleeder part 70 and the periphery of the heat emitting body 60. A non-contact part 90 is provided between the narrow parts 80 and the inside bottom of the vessel body 11. When the vessel body 11 goes in an loadless boiling condition, the narrow parts 80 get an ultra-high temp. to cause the heat emitting body 60 to blow off at any of the parts 80, so that the eddy current 51 from the cooking apparatus 20 is out off and heat emission is stopped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a container used when an electromagnetic cooker is used, and more specifically, it is inexpensive and has an electromagnetic mechanism with a safety mechanism for reliably preventing heat generation and ignition of the container due to empty cooking during electromagnetic cooking. Regarding cooking containers.

[0002]

Prior Art and Problems to be Solved by the Invention First,
The mechanism of the electromagnetic cooker currently used is described below.

The electromagnetic cooker is a cooking appliance to which induction heating is applied, and an alternating magnetic field is generated by passing a high frequency current 31 through a built-in heating coil 30 as shown in FIGS. 1, 2 and 3. In this alternating magnetic field, install a metal container of conductor,
A mechanism for heating the container body 10 as a conductor is used.

More specifically, an alternating magnetic field in two directions is generated from the heating coil 30 of the electromagnetic cooker 20. One is a magnetic force line 40 in the horizontal direction with respect to the bottom surface of the conductor container in FIG. 1, and the other is a magnetic force line 41 in the vertical direction with respect to the bottom surface of the container in FIG. 2. As shown in FIG. An eddy current 50 in the thickness direction is induced on the bottom surface, and an eddy current 51 in the surface direction is induced on the bottom surface of the conductor container by magnetic field lines 41, so that the eddy currents 2 in the thickness direction and the surface direction are generated in the container bottom.
Eddy currents in the same direction flow simultaneously. The conductor container body 10 is heated by Joule heat loss generated from the eddy currents in the two directions. Further, the container body 10 is a conductor and at the same time F
In the case of a ferromagnetic material such as e or Ni, in addition to the Joule heat loss, it is also heated by hysteresis loss (a phenomenon in which the magnetization is delayed with respect to the magnetic field when changing the magnetic state of the ferromagnetic material).

The above mechanism is for the case where the container body is made of a metal which is a conductor. However, from the viewpoint of cost, it has been desired that the container body be inexpensively constructed of a substance other than metal. Actually, the container body is made of a non-conductive material such as synthetic resin or paper, and a metal foil layer of a conductive material is provided on the bottom of the container (Kaikaihei 4-61).
95).

However, when the above-mentioned container is heated without accommodating a predetermined object to be heated in the container (hereinafter referred to as erroneous operation), the main body of the container or a conductor portion such as a metal foil layer generates heat by induction heating. Nevertheless, since the contained material does not sufficiently absorb heat, the conductor is heated more than necessary and the entire container becomes extremely hot. For this reason, especially when a container body made of synthetic resin or paper is used, there is a risk of generation of decomposition gas due to heat, smoking or ignition.

It is an object of the present invention to provide an electromagnetic cooking container with a safety mechanism that is inexpensive and safe even when an erroneous operation is made by utilizing the properties of the electromagnetic cooking device described above.

[0008]

The properties of the alternating magnetic field and the eddy current generated by the electromagnetic cooker are known to be as follows.

That is, the eddy current 5 induced in the alternating magnetic field
0 and 51 are affected by the frequency of the power supply current 31 of the heating coil 30 and the material and thickness of the conductor. In particular, the thicker the conductor is, the easier the eddy current flows. Therefore, when the conductor is a thin film having a thickness of several tens of microns or less, the eddy current 50 in the thickness direction hardly flows. Further, when the conductor is a non-magnetic substance such as aluminum, there is no heating due to hysteresis loss, so the conductor is heated only by Joule heat loss due to the eddy current 51 in the in-plane direction.

Therefore, as a result of the earnest studies by the present inventors, when the heating element is formed into a thin film, almost no eddy current in the thickness direction of the eddy current due to electromagnetic induction flows in the bottom surface of the container.
The eddy current used for heating is almost only in the plane direction,
Further, if a narrow portion is provided in the radial direction or the thickness direction from the center to the outer periphery of the conductor, the load of Joule heat loss becomes the maximum in the narrow portion, and as a result, heat is generated in the empty state. Before the whole body is overheated, only the narrow part becomes extremely hot locally, and the heating element is melted and cut at the narrow part, so that the eddy current in the surface direction is interrupted and the heat generation is stopped. Heading The present invention has been completed.

That is, the present invention has been invented in order to achieve the above-mentioned problems and objects in the prior art, and has the following structures (1) to (11) as its gist.

(1) A thin-film heating element made of a conductive material is laminated on the inner bottom surface of a container body made of a non-conductive material, and the width in the radial direction is locally shortest from the center to the outer peripheral portion of the heating element. A container for electromagnetic cooking with a safety mechanism, characterized in that a narrow portion is provided.

(2) A thin film heating element made of a conductive material is laminated on the inner bottom surface of a container body made of a non-conductive material, and the width in the thickness direction is locally shortest from the center to the outer peripheral portion of the heating element. A container for electromagnetic cooking with a safety mechanism, which is provided with a narrow portion that becomes

(3) The electromagnetic cooking container with a safety mechanism as described in (1) or (2) above, wherein the narrow portion is provided near the outer periphery of the heating element.

(4) The above-mentioned (1) or (2), characterized in that a hollow portion is provided near the central portion of the heating element.
The container for electromagnetic cooking with the safety mechanism described in.

(5) The electromagnetic cooking container with a safety mechanism as described in (4) above, wherein the hollow portion has a hole shape.

(6) The electromagnetic cooking container with a safety mechanism as described in (4) above, wherein the hollow portion has a slit shape.

(7) The electromagnetic cooking container with a safety mechanism according to any one of the above (1) to (6), characterized in that the narrow portion is formed at a plurality of locations on the heating element.

(8) A non-contact portion is provided between the lower surface of the heating element and the inner bottom surface of the container body to separate the lower surface of the narrow portion from the inner bottom surface of the container body. ) To (7), the container for electromagnetic cooking with a safety mechanism.

(9) The electromagnetic mechanism with a safety mechanism according to the above (8), characterized in that the non-contact portion is formed by making the narrow portion convex with respect to the inner bottom surface of the container. Cooking container.

(10) The safety mechanism according to (8), wherein the non-contact portion is formed by forming a concave shape on the bottom surface of the container at a portion corresponding to the narrow portion. Electromagnetic cooking container with.

(11) For electromagnetic cooking with a safety mechanism according to (8), wherein the non-contact portion is formed by laminating a heat insulating thin film on the lower surface of the narrow portion. container.

[0023]

The electromagnetic cooking container of the present invention will be described in detail below with reference to the accompanying drawings. First, the structure of the entire container will be described.

FIG. 4 is a perspective partial cutaway sectional view of the electromagnetic cooking container 1 with a safety mechanism of the present invention.

The container body 11 has a substantially cylindrical shape, and a barb 11a is provided on the upper part of the container so as to extend outward, and the outer diameter is gradually reduced from the upper part of the container to the bottom part of the container.

Further, a thin-film heating element 60 is fixedly laminated inside the bottom of the container body 11, and a substantially cross-shaped hollow portion 70 is formed in the central portion of the heating element 60. The cross-shaped tip portion 70a of the portion 70 and the outer periphery of the heating element 60 form four narrow portions 80 having the shortest radial width.

Further, as shown in FIG. 10, a concave portion 11b is formed on the inner bottom surface of the container main body at a portion corresponding to the narrow portion 80, whereby a non-contact portion 90 is formed on the lower surface of the narrow portion 80. There is.

Next, the size, shape, material and the like of each of the above-mentioned components will be described in detail.

First, the container body 11 is made of a non-conductive material so as not to be affected by electric power and magnetic force.
By using a non-conductive material, it is impossible to directly heat the container body by the electromagnetic cooker. As the non-conductive material, synthetic resins such as polyethylene, polypropylene, polystyrene and polyester, laminates of these synthetic resins, laminates of these synthetic resins and paper, etc. are appropriately used.

Further, the heating element 6 fixed to the container body
0 uses a conductive material capable of receiving heat from the electromagnetic cooker. The conductive material is mainly a metal, but specifically, it is possible to use simple substances such as iron, stainless steel, copper, aluminum, and carbon, or alloys thereof. Of these, aluminum and stainless steel are particularly suitable as the heating element 60 because they are resistant to rust, but are not limited thereto.

Since the size of the heating element 60 depends on the alternating magnetic field of the heating coil 30 inside the electromagnetic cooker 20 used, the size of the heating element 60 should be adapted to the diameter of the coil of the electromagnetic cooker 20 currently on the market. Usually a minimum diameter of 80-120 mm or more is required. Further, the larger the area of the heating element 60 is, the more the heating efficiency is increased. However, since the portion largely protruding from the diameter of the heating coil 30 is hardly heated, if the diameter is larger than the diameter of the heating coil 30, the heat capacity and the heat radiation during heating are increased. , The heating efficiency decreases. Further, it is not preferable in use that the container body 11 protrudes from the electromagnetic cooker 20 and the operation panel and the like are hidden by the container, and therefore the diameter of the heating element 60 is usually 250 to 300 mm or less at maximum. Further, the shape does not necessarily have to be a disk shape, and a polygonal shape can be appropriately selected as shown in FIGS. 11 to 17 as long as it is a shape related to induction heating of the electromagnetic cooker. Therefore, the size and shape of the container body 11 are similar to those of the heating element 60.

The thickness of the heating element 60 depends on the eddy current flowing in the heating element 60 and its resistance. That is, the heating element 60
If the thickness is thick, the amount of eddy current increases, but the Joule heat loss due to electrical resistance decreases. On the contrary, when the heating element 60 is thin, the electrical resistance increases but the amount of eddy current decreases, so that the Joule heat loss decreases. Therefore, the thickness of the heating element 60 is appropriately set so as to have the best thermal efficiency according to the material used and to allow the fusing at the narrow portion 80 at the time of an erroneous operation, but normally 5 to 200 μm, preferably 10 to 80 μm Thin film.

Further, the narrow portion 80 is formed at four locations in the radial direction near the outer periphery of the heating element 60 by the hollow portion 70 having a substantially cross shape in FIG. However, the narrow portion is not limited to this, and if the portion where the width in the radial direction or the thickness direction is locally shortest is provided from the center of the heating element 60 to the outer peripheral portion, the narrow portion 80 is formed. It can be used.

For example, the narrow portion 80 in the radial direction is provided with the hollow portion 70 in the vicinity of the central portion of the heating element 60, or as shown in FIG. It can be formed by providing 60b. Further, the narrow portion 80 in the thickness direction is continuously formed from the center of the heating element 60 to the outer periphery (not shown), or as shown in FIG. 17, from the outer periphery of the hollow portion 70 to the outer periphery of the heating element 60. It suffices to form a groove-shaped portion where the thickness of the heating element 60 is locally thin.

Here, the narrow portion 80 is not melted when a predetermined object to be heated is accommodated, regardless of the strength of the induction heating force depending on the model of the electromagnetic cooker, and it is ensured in the case of an erroneous operation. The width and shape of the narrow portion 80 should be melted and cut, and the width and shape of the narrow portion 80 are the thickness, area, shape and material of the heating element 60, the material of the container body 11, and the material of the object to be heated. It is appropriately determined according to the amount and amount. Usually, the width of the narrow portion 80 is preferably about 5 to 100 mm in the radial direction, and about 2 times the thickness of the heating element 60 in the thickness direction.
It is set to one-half. The narrow portion in the thickness direction is formed by pressing (rolling) or polishing a part of the heating element.

Further, if the narrow portion 80 is formed at least at one or more places, it can be melted down by mistake, but when it is heated by an electromagnetic cooker, the narrow portion 80 has other portions of the heating element. Since the load of Joule heat loss is large and the calorific value is large compared to, it is difficult to cause heat conduction due to convection in the object to be heated, such as solid food such as frozen food, or high-viscosity fluid food such as curry and stew In some cases,
Only the area around the narrow portion is easily heated, which may cause uneven heating of the object to be heated.

In such a case, it is preferable to provide a plurality of narrow portions 80 on the heating element 60 in order to prevent uneven heating. The specific shapes of the narrow portion 80 and the hollow portion 70 will be described later as an example.

Finally, as for the non-contact portion 90, as shown in FIGS. 4 and 10, the heating element 60 is flat, and the concave portion 11b is formed in the inner bottom portion of the container body 11 on the lower surface of the narrow portion 80 to form the narrow portion 80. The non-contact portion 90 is provided as a space between them to avoid contact with the narrow portion 80. Further, as shown in FIG. 9, in the narrow portion 80, the convex portion 60a is formed on the heating element 60 side, and the narrow portion 80 is formed.
It is also possible to simply provide the non-contact portion 90 as a space between the inside and the bottom of the container body 11.

Further, as shown in FIG. 11, a non-contact heat insulating thin film 90a may be used only on the lower surface of the narrow portion 80. As the heat insulating thin film 90a used in this case, a material having a high melting point and a low heat conductivity is preferable in order to withstand extremely high temperatures in the narrow portion and suppress heat conduction to the inside of the container as much as possible, and usually alumina or the like is used. The thickness is preferably 0.1 to 1.0 mm in order to more reliably prevent heat conduction to the inside of the container bottom.

As described above, the present invention provides the hollow portion 7
0 and the heating element 60 provided with the narrow portion 80 are provided in the container body 1.
Although the basic structure is that the heating element 60 and the container body 11 are fixed to each other via a non-contact portion, the following two methods can be adopted for joining the heating element 60 and the container main body 11, for example.

One is in-mold molding, in which a thin-film heating element 60 punched into a predetermined shape is set in a mold in advance when molding the container body 11.
This is a method of integrating the heating element 60 and the container body 11 by bringing a sheet filled with molten resin (injection molding) or softened into close contact with a mold (thermoforming). A material that can be fused at the time of melting the material, a heat seal layer, and the like are suitable.

The other is post-attachment, in which a thin film heating element 60 punched into a predetermined shape is attached to a preformed container body 11. As a sticking method, heat sealing, an adhesive tape, adhesion, etc. are suitable.

Therefore, at the time of fixing, the above two methods may be appropriately selected according to the material of the container body 11 and the structure of the heating element 60.

Further, since the heating element is composed of several layers which have several kinds of effects, a detailed cross-sectional view of the heating element will be described below with reference to FIGS. 5 to 8.

First, FIG. 5 shows a three-layer structure of an Al foil 61, an adhesive layer 62, and a release paper 63 in order from the top. Here, the Al foil 61 is a conductive material in the heat generating portion of the heat generating element, and is provided with an adhesive layer 62 for performing the above-mentioned retrofitting, and is covered with a release paper 63 for protection until the adhesive layer is used.

Next, FIG. 6 shows a resin coat 64, an Al foil 61,
It has a three-layer structure including the heat seal layer 65. Where A
The l-foil 61 is used for a heat-generating portion of a conductive heating element, and in order to prevent the Al foil from being corroded by reacting with the content and being eluted into the content, the resin coat 6
4 protects the upper surface of the Al foil. Further, by providing the resin on both sides of the heating element, it is possible to prevent curling, peeling and the like, which are likely to occur when the heating element is a single layer. This heating element is provided with a heat seal layer 65 on the lower surface of the Al foil 61 for the above-mentioned in-mold molding or subsequent attachment.

Unlike FIG. 5 and FIG. 6, FIG. 7 has a four-layer structure and is composed of a resin coat 64, an Al foil 61, an adhesive layer 62, and a synthetic paper 66 in order from the upper layer. Here, since the resin coat 64 protects the Al foil 61, the Al foil 61 is a heat generating portion of the heating element, and the adhesive layer 62 is the Al foil 61 and the synthetic paper 6.
It is used for adhesion with 6. Bottom synthetic paper 6
6 is for preventing wrinkles from occurring in the heating element 60 due to the difference in the coefficient of thermal expansion between the container body 11 and the heating element 60 when or after joining the container body 11 and the heating element 60, and synthetic paper. The heat insulating element 66 is attached to prevent heat deformation of the bottom of the container due to the heat of the heat generating element 60. FIG. 7 is suitable for in-mold molding.

FIG. 8 has a four-layer structure similar to FIG. 7, and is composed of a stainless layer 67, an adhesive layer 62, a synthetic paper 66, and a heat seal layer 65 in order from the top. Here, the heat generating portion of the heat generating element uses the stainless steel layer 67. Since this stainless steel is also a conductive material like the Al foil, it can be heated by electromagnetic cooking. Further, the adhesive layer 62 is used to attach the synthetic paper 66 to the stainless steel layer 67, and the synthetic paper 66 is used to prevent the wrinkles occurring in the heating element before and after the adhesion of the heating element, as in FIG. 7. ing. Below the synthetic paper 66, a heat seal layer 65 is provided for in-mold molding or subsequent attachment to the container body.

The respective materials used for the cross sections of the four types of heating elements shown in FIGS. 5 to 8 will be described below.

First, the heat generating portion of the heat generating body 60 is made of a conductive material that can be heated by the electromagnetic cooker 20, and as described above, iron, stainless steel, copper, aluminum, carbon, etc., or a single material thereof. Use an alloy. The Al foil 61 and the stainless steel layer 67 are included in this conductive material.

Here, since the surface of the heating element 60 is in direct contact with the contents, the heating portion may be corroded depending on the contents, or a part of the heating element 60 may be eluted into the contents. Is predicted.

Therefore, the resin coat 64 protects the surface of the heating element 60 from various reactions with the contents and keeps the heat efficiency of heat generation good. Therefore, a thickness of several microns is preferable, and the resin coat 64 does not pose a problem in food hygiene. The material is appropriately adopted.

Further, the adhesive layer 62 and the heat seal layer 65 on the lower surface of the heating element 60 for joining the heating element 60 and the container body 11 are made of an olefinic material from the viewpoint of adhesiveness, heat resistance and hygiene. It is preferable to use.

When the container body 11 and the heating element 60 are joined, or after the joining, the container body 11 and the heating element 60 are joined.
Synthetic paper 66 is used in order to prevent wrinkles caused by a difference in the coefficient of thermal expansion from the above.

At this time, the synthetic paper 66 has an appropriate thickness, strength, and
Since elasticity and heat resistance are required, for example, “Yupo” (trade name) manufactured by Mitsubishi Yuka is suitable. However, it is not limited to this.

The operation of the electromagnetic cooking container of the present invention will be described below.

Since the container body 11 is a non-conductive material, it is not affected by the electromagnetic force from the electromagnetic cooker 20, but the conductive material is used for the heating element 60. Eddy current 51 is generated in 60. The heat generated by the Joule heat loss of the eddy current 51 can heat the contents in the container. (Refer to FIG. 3) Further, since the narrow portion 80 formed by providing the hollow portion 70 in the central portion of the heating element 60 has a higher electric resistance than the other portions of the heating element 60, the load due to Joule heat loss. Is larger than the other parts, and becomes locally hot.

Here, when a predetermined object to be heated is accommodated in the container, the heat of the entire heating element 60 is absorbed by the object to be heated and the heating in the container is continued as it is. The heat generated by the heating element 60 is not absorbed when no object is stored, that is, at the time of an erroneous operation.

In this case, before the entire heating element 60 is overheated, only the narrow portion 80 has a local extremely high temperature, and the heating element 60 is melted and cut at the narrow portion 80, so that the surface direction is reduced. The eddy current 51 is cut off and heat generation stops. When the non-contact portion 90 on the lower surface of the narrow portion 80 is present, it is possible to reliably prevent the high heat from being transferred to the container body 11, so that the fusing in the narrow portion 80 is performed more reliably.

Therefore, it is possible to provide an electromagnetic cooking container which is inexpensive and safe even in the case of erroneous operation.

Various shapes of the heating element 60 capable of obtaining the same effect as the above operation will be sequentially described below with reference to FIGS. 12 to 17.

First, FIG. 12 shows that four circular hollow portions 70 are evenly provided in the vicinity of the central portion of the heating element 60. The four shortest portions of the width between the outermost portion of the hollow portion 70 and the outer periphery of the heat generating element 60 correspond to the narrow portion 80, and when the erroneous operation is performed, the narrow portion 80 becomes extremely hot and is melted. In this case, the number of the circular hollow portions 70 is four, but the number may be four or less, or even four or more. In that case, it is preferable that the hollow portions are arranged such that the widths of the narrow portions are uniform on the heating element.

In FIG. 13, four radial notches 71 are provided from the vicinity of the central portion of the heating element 60 toward the outer periphery.
Minute circular holes are opened at both ends of the notch 71.
The holes are appropriately provided in order to prevent the heating element from being torn from the end portion of the notch and to more accurately perform the fusing in the narrow portion at the time of an erroneous operation. In this case, the space between the four outer holes and the outer periphery of the heating element 60 becomes the narrow portion 80. At the time of erroneous operation, the narrow portion 80 is melted and cut as in FIG. At this time, the number of the notches 71 is four, but like the hollow portion in FIG. 12, it is not limited to four, and in that case, it is preferable that the notches 71 are evenly arranged in a radial pattern on the heating element 60.

In FIG. 14, a circular hollow portion 70 is provided at the center of gravity of a substantially triangular heating element 60 having arcuate corners. The narrow portion 80 has three shortest distances between the midpoints of the three sides of the substantially triangular shape and the outer periphery of the hollow portion 70, and the narrow portion 80 is melted and cut by a mistake during operation.

In FIG. 15, a quadrangular hollow portion 70 is provided at the center of a substantially quadrangular heating element 60 having an arc-shaped corner.
The diagonal line of the hollow portion 70 forms an angle of 45 degrees with the diagonal line of the heating element 60. In this case, the distances between the corner portions 70b at the four corners of the hollowed-out portion 70 and the midpoint portions of the four sides of the heating element 60 are the shortest, and thus the intervals are the narrow portions 80. The narrow portion 80 is melted and cut by mistake.

FIG. 16 shows a substantially cross-shaped heating element 60 having four corners in an arc shape. Four concave portions 60 on the outer circumference of the heating element 60
b, and the width in the radial direction from the center of the heating element 60 to the four recesses is short, so that the four positions become the narrow width portions 80. The narrow portion 80 is melted and cut by mistake.

In FIG. 17, four extremely thin portions 60c, which are thin portions of the conductor, are formed in a groove shape in the radial direction from the central portion of the donut-shaped heating element 60, and the groove has a narrow portion 80. Becomes

Although the width in the radial direction of the heating element 60 in FIGS. 12 to 16 is the shortest, the narrow portion 80 has the shortest width in the thickness direction of the heating element 60. The narrow portion 80 is extremely loaded and is melted.
The number of the groove-shaped narrow portions 80 is not limited to four and may be at least one.

[0069]

When the electromagnetic cooking container 1 of the present invention is heated by the electromagnetic cooker 20, the heating coil 3 of the electromagnetic cooker 20 is supplied with an electric current.
A magnetic field is generated from zero. The induced eddy current 51 generated by the magnetic field flows through the heating element 60, the heating element 60 is heated by Joule heat loss generated by the eddy current, and the object to be heated is heated by the heat of the heating element 60. Here, when the object to be heated is not housed in the container, the heat of the heating element 60 is not absorbed, so that the temperature of the heating element 60 as a whole becomes high.
Since the electrical resistance in the narrow portion 80 locally increases, the Joule heat loss concentrates and reaches an extremely high temperature. Therefore, the narrow portion 80 is melted without being able to withstand the load of Joule heat loss.

When the contacted portion 90 is provided between the narrow portion 80 and the container body 11, the inner bottom portion of the container body is not in contact with the narrow portion 80, so that the container body 11 has a narrow width. The heat generated by the portion 80 is hardly absorbed. Therefore, the narrow portion 80 becomes extremely hot before the entire heating element is heated, and is surely blown.

By fusing the narrow portion 80, even if the magnetic field generated from the heating coil 30 acts on the heating element 60, the eddy current in the surface direction in the heating element 60 is completely cut off. Heating is stopped as it is

On the other hand, the electromagnetic cooker 20 is provided with a safety mechanism for stopping the heating when there is usually no heating element for generating electromagnetic induction above a certain level.

Therefore, the melting of the heating element 60 at the narrow portion 80 completely stops the heating of the electromagnetic cooking container 1 of the present invention by the mechanism of both the electromagnetic cooking container and the electromagnetic cooking device.

From the above, the present invention provides an inexpensive electromagnetic cooking container with a safety mechanism that reliably prevents heat generation and ignition of the container due to empty cooking during electromagnetic cooking.

[Brief description of drawings]

FIG. 1 relates to an eddy current (thickness direction) generated at the bottom of an electromagnetic cooking container.

FIG. 2 relates to an eddy current (plane direction) generated at the bottom of an electromagnetic cooking container.

FIG. 3 relates to an eddy current (thickness direction, surface direction) generated at the bottom of an electromagnetic cooking container.

FIG. 4 relates to a perspective partial cutaway sectional view of an embodiment of the present invention.

FIG. 5 is a sectional view of a heating element according to an embodiment of the present invention.

FIG. 6 is a sectional view of a heating element according to an embodiment of the present invention.

FIG. 7 is a sectional view of a heating element according to an embodiment of the present invention.

FIG. 8 is a sectional view of a heating element according to an embodiment of the present invention.

FIG. 9 is a cross-sectional view of a non-contact portion according to the embodiment of the present invention.

FIG. 10 is a cross-sectional view of a non-contact portion according to the embodiment of the present invention.

FIG. 11 is a plan view of a non-contact portion according to the embodiment of the present invention.

FIG. 12 relates to a plan view of a heating element according to an embodiment of the present invention.

FIG. 13 is a plan view of a heating element according to an embodiment of the present invention.

FIG. 14 is a plan view of a heating element according to an embodiment of the present invention.

FIG. 15 is a plan view of a heating element according to an embodiment of the present invention.

FIG. 16 is a plan view of a heating element according to an embodiment of the present invention.

FIG. 17 is a plan view of a heating element according to an embodiment of the present invention.

[Explanation of Codes] 1 ... Container for electromagnetic cooking with safety mechanism 10 ... Container body (conductor) 11 ... Container body (non-conductor) 11a ... Return 11b ... Recess 20 ... Electromagnetic cooker 30 ... Heating coil 31 ... Current ( Coils 40 ... Magnetic force lines (plane direction) 41 ... Magnetic force lines (thickness direction) 42 ... Magnetic force lines (axial direction) 50 ... Eddy current (thickness direction) 51 ... Eddy current (plane direction) 60 ... Heating element 60a ... Convex portion 60b ... Recessed portion 60c ... Ultra-thin portion 61 ... Al foil 62 ... Adhesive layer 63 ... Release paper 64 ... Resin coat 65 ... Heat seal layer 66 ... Synthetic paper 67 ... Stainless layer 70 ... Hollow-out portion 70a ... Cross-shaped tip portion 70b ... Corner Part 71 ... Notch 80 ... Narrow part 90 ... Non-contact part 90a ... Heat insulating thin film

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kenji Ikemoto 1-4-4 Ushijimahonmachi, Toyama City, Toyama Prefecture Kitano Manufacturing Co., Ltd.

Claims (11)

[Claims] 1. A thin film heating element made of a conductive material is laminated on the inner bottom surface of a container body made of a non-conductive material, and the radial width is locally minimized from the center to the outer peripheral portion of the heating element. A container for electromagnetic cooking with a safety mechanism characterized by having a narrow portion. 2. A thin-film heating element made of a conductive material is laminated on the inner bottom surface of a container body made of a non-conductive material, and the width in the thickness direction is locally shortest from the center to the outer peripheral portion of the heating element. A container for electromagnetic cooking with a safety mechanism, characterized in that a narrow portion is provided. 3. The electromagnetic cooking container with a safety mechanism according to claim 1, wherein the narrow portion is provided near the outer periphery of the heating element. 4. The container for electromagnetic cooking with a safety mechanism according to claim 1, wherein a hollow portion is provided near the center of the heating element. 5. The electromagnetic cooking container with a safety mechanism according to claim 4, wherein the hollow portion has a hole shape. 6. The electromagnetic cooking container with a safety mechanism according to claim 4, wherein the hollow portion has a slit shape. 7. The electromagnetic cooking container with a safety mechanism according to claim 1, wherein the narrow portion is formed in a plurality of locations on the heating element. 8. The non-contact portion, which separates the lower surface of the narrow portion and the inner bottom surface of the container body, between the lower surface of the heating element and the inner bottom surface of the container body.
A container for electromagnetic cooking with a safety mechanism according to any one of 1. 9. The container for electromagnetic cooking with a safety mechanism according to claim 8, wherein the non-contact portion is formed by making the narrow portion convex with respect to the inner bottom surface of the container. . 10. The electromagnetic cooking device with a safety mechanism according to claim 8, wherein the non-contact portion is formed by forming a concave shape on the inner bottom surface of the container at a portion corresponding to the narrow portion. Container. 11. The electromagnetic cooking container with a safety mechanism according to claim 8, wherein the non-contact portion is formed by laminating a heat insulating thin film on a lower surface of the narrow portion.