JP2010044929A - Induction heat generating element, and induction heating container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an induction heat generating element used for an induction heating container for heating a housed heated object in an electromagnetic cooker or the like by installing the heating element on a non-magnetic (or non-conductive) container body and hardly spoiling heating efficiency during normal use while raising the safety thereof by installing a section selectively broken under designated conditions such as a case that it is heated at an empty state and effectively avoiding damages caused by heat of the container body, and to provide an induction heating container having such induction heat generating element. <P>SOLUTION: The induction heat generating element 3 for generating heat by inducing eddy current by a high frequency magnetic field includes a planar primary section 30, a support section 32 which erects in a direction from a center side of the primary section 30 toward an outer edge side, and an excessive heat-generating section 31 formed at a pointed head side of the support section 32 by being separated from the primary section 30. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an induction heating heating element in which an eddy current is induced by a high-frequency magnetic field generated by an electromagnetic induction heating coil provided in an electromagnetic cooker or the like and generates heat due to its Joule heat, and induction heating including such an induction heating heating element Concerning the container.

  In recent years, instead of cooking appliances that have been mainly gas appliances, cooking appliances generally called electromagnetic cookers are used in the food and beverage industry in terms of safety, cleanliness, convenience, and economy. Not only for use, but also for general households.

  However, this type of electromagnetic cooker generates a high-frequency magnetic field by an electromagnetic induction heating coil provided inside, and heats an object to be heated by Joule heat generated by an induced eddy current. For this reason, while cooking can be performed without using flames, the cooking utensils that can be used are limited in principle, and special cooking utensils made of magnetic metals such as iron and iron enamel must be used. There was a disadvantage.

  Under these circumstances, for example, in Patent Document 1 and Patent Document 2 and the like, as a means for eliminating the disadvantages of the above-described electromagnetic cooker, an electromagnetic cooker equipped with a non-magnetic (or non-conductive) container body is used. Containers have been proposed.

JP 2003-325327 A JP 7-296963 A

Here, Patent Document 1 proposes a heating method using an electromagnetic cooker that generates heat from an 0.10 to 100 μm aluminum foil by eddy current generated from the electromagnetic cooker. For example, it is said that even a non-magnetic container can easily heat the contents using an electromagnetic cooker.
However, in such a heating method, when the air is accidentally blown, the container is damaged due to the danger that the aluminum foil suddenly rises in temperature and easily burns and scatters. There was a problem that there was a risk of it.

  On the other hand, in Patent Document 2, an electromagnetic cooking container in which a conductive thin film heating element is laminated on the inner bottom surface of a non-conductive container main body, the central portion of the heating element is punched into a predetermined shape. For example, an electromagnetic cooking container with a safety mechanism has been proposed in which a narrow portion having a narrow radial width from the outer periphery is provided in a heating element. And according to such an electromagnetic cooking container of patent documents 2, since the narrow part provided in the heating element is selectively melted at the time of an erroneous operation such as emptying, the heat generation of the container due to emptying etc. It is said that ignition can be prevented.

  However, as a result of extensive studies by the present inventors, it has come to the knowledge that there are still problems to be solved in order to use these conventional techniques for actual use.

That is, in the electromagnetic cooking container of Patent Document 2, the narrow portion provided in the heating element is locally heated so that the narrow portion is selectively melted. Therefore, the output of the heating element is defined by the narrow part where the temperature is highest. For this reason, there was a problem that other portions of the heating element did not generate heat effectively and the heating efficiency was poor.
Furthermore, in the container for electromagnetic cooking of Patent Document 2, although an example in which a non-contact portion that separates the lower surface of the narrow portion and the inner bottom surface of the container body is provided, heat generation in the narrow portion tends to be excessive. However, when such a non-contact portion is provided, the container body may still be damaged.

  The present invention has been made in view of the above circumstances, and is used as an induction heating container that is attached to a non-magnetic (or non-conductive) container body and heats an object to be heated by an electromagnetic cooker or the like. In such a use mode, in a normal use, while providing a portion that selectively breaks under a predetermined situation such as when it is in an empty state, improving its safety, An object of the present invention is to provide an induction heating heating element capable of effectively preventing damage to the container body due to heat, and an induction heating container provided with such an induction heating heating element, so that the heating efficiency is not impaired. To do.

  An induction heating heating element according to the present invention is an induction heating heating element that generates heat when an eddy current is induced by a high-frequency magnetic field, along a planar main portion and a direction from the center side to the outer edge side of the main portion. And a support portion that rises up and an excessive heat generating portion that is formed on the front end side of the support portion so as to be separated from the main portion.

  The induction heating container according to the present invention is provided with an induction heating heating element that generates heat by inducing an eddy current by a high-frequency magnetic field on the inner bottom surface side of the container body, and the induction heating heating element has a planar shape. The main portion, a support portion that rises in a direction from the center of the main portion toward the outer edge, and an excessive heat generating portion formed on the distal end side of the support portion are provided.

  According to the present invention, when an object to be heated can be heated by induction heating using an electromagnetic cooker or the like, the excessive heat generating portion that selectively breaks under a predetermined situation such as when the air is heated. Provided on induction heating heating element to enhance its safety, and to prevent the heating efficiency from being impaired during normal use, effectively avoiding damage due to heat of the container body, commercially available electromagnetic cookers etc. Thus, the object to be heated can be heated safely and easily.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
1A is a plan view showing an outline of the induction heating container according to the present embodiment, and FIG. 1B is a cross-sectional view taken along line AA in FIG.

  A container 1 shown in FIG. 1 includes a container main body 2 configured to store a liquid object to be heated such as water, and an induction heating heating element 3 that generates heat when an eddy current is induced by a high-frequency magnetic field, An induction heating heating element 3 is attached to the inner bottom surface 21 side of the container body 2.

  In the example shown in FIG. 1, the inner bottom surface 21 of the container body 2 has a planar shape that is substantially square. The container body 2 is configured so that a liquid heated object can be accommodated by erecting the side wall portion 22 so as to surround the inner bottom surface 21, but the planar shape of the inner bottom surface 21 is an example shown in the figure. It is not limited to. For example, in addition to a rectangular shape or a circular shape, a polygonal shape such as a triangle, pentagon, or hexagon may be used. The overall shape of the container body 2 is not limited to the illustrated example, and various shapes can be used in consideration of ease of use.

  However, since the container 1 is generally used on a commercially available electromagnetic cooker, the size of the inner bottom surface 21 of the container body 2 and the induction heating heating element 3 attached to the inner bottom surface 21 side is It is preferable to set according to the size of the heating coil provided in the electromagnetic cooker to be used. For example, a general heating coil included in a commercially available home-use electromagnetic cooker has an inner diameter of about 5 cm and an outer diameter of about 20 cm. The size is appropriately determined according to the electromagnetic cooker.

  Such a container main body 2 is made of various kinds of materials such as polystyrene resin such as polystyrene, polyester resin such as polyethylene terephthalate, polyolefin resin such as polypropylene, synthetic resin material such as polyamide resin, and paper and glass. It can be formed of a general-purpose nonmagnetic material. By forming the container body 2 with these materials, an induction heating container that can be used in an electromagnetic cooker can be provided at low cost.

On the other hand, the induction heating heating element 3 is formed by using a conductive material that can generate heat by generating an eddy current by a high frequency magnetic field generated from an electromagnetic induction heating coil provided in an electromagnetic cooker or the like, and generating Joule heat due to its electric resistance. Is done. For example, metals such as aluminum, nickel, gold, silver, copper, platinum, iron, cobalt, tin, and zinc, or alloys thereof, or resin films and papers with conductivity are heated by induction heating using a high-frequency magnetic field. It can be formed using various conductive materials.
More specifically, for example, when aluminum is used as the metal material, the induction heating heating element 3 is preferably formed using an aluminum foil having a thickness of about 0.10 to 100 μm, more preferably about 1 to 40 μm. Can do.

  In this embodiment, by attaching such an induction heating heating element 3 to the inner bottom surface 21 side of the container body 2, the object to be heated accommodated in the container body 2 is heated by induction heating using an electromagnetic cooker. I can do it. The induction heating heating element 3 is preferably formed using a metal foil such as an aluminum foil. By laminating a resin layer having heat sealability on the material used for the container body 2, adhesion by heat sealing is performed. Can be made possible.

  In addition to this, although it may be attached using an adhesive tape or an adhesive, it is preferable that the induction heating heating element 3 is partially adhered to the inner bottom surface 21 of the container body 2. By partially adhering the induction heating heating element 3 to the container main body 2, a liquid heated object such as water accommodated in the container main body 2 is attached to the back side of the induction heating heating element 3, that is, the container main body 2. It also reaches the induction heating element 3. As a result, the heating efficiency for the object to be heated can be increased, and the container body 2 can be effectively prevented from being damaged by the heat from the induction heating heating element 3.

  Although not shown in particular, the induction heating heating element 3 may be attached to be separated from the inner bottom surface 21. In order to attach the induction heating heating element 3 apart from the inner bottom surface 21, the induction heating heating element 3 is supported on a support portion protruding from the inner bottom surface 21 of the container body 2 or the outer edge of the induction heating heating element 3. A support piece extending from the portion can be provided, and the support piece can be locked to the periphery of the opening of the container body 2.

In addition, the induction heating heating element 3 in the present embodiment includes a planar main portion 30, a support portion 32 that rises in a direction from the center side of the main portion 30 toward the outer edge side, and a distal end side of the support portion 32. An excessive heat generating portion 31 formed apart from the main portion 30 is provided.
Such an induction heating heating element 3 can be formed as shown in FIGS. 2 and 3, for example.

First, in forming the induction heating heating element 3, the aluminum foil is formed so that the rising portion 310 as shown in FIG. 2A is formed along the direction from the center side to the outer edge side of the main portion 30. Bending a conductive material such as Next, as shown in FIG. 2B, the upper edge of the rising portion 310 is cut.
Accordingly, the main portion 30 is divided along a direction from the center side toward the outer edge side at a predetermined portion where the excessive heat generating portion 31 is to be formed, and one end edge portion of the divided main portion 30 is separated from the main portion 30. A pair of rising pieces 310a and 310b rising in parallel from the other edge is formed.

  Next, as shown in order in FIGS. 3A, 3B, and 3C, the ends 31a and 31b of the rising pieces 310a and 310b are overlapped and folded to form the excessive heat generating portion 31. At the same time, the remaining part on the base side of the rising pieces 310 a and 310 b is defined as a support part 32. Although not particularly illustrated, it is preferable that the excessive heat generating portion 31 is formed by overlapping the leading end sides of the rising pieces 310a and 310b in an irregularly folded manner and further crimping the folded portions.

The excess heat generating part 31 formed in this way has a current path through which eddy currents induced in the induction heating heat generating element 3 flow between the tips 31a, 31b of the folded up rising pieces 310a, 310b or the vicinity thereof. As a result, the resistance value is maximized. For this reason, under a predetermined situation such as when the engine is in an empty state, the amount of heat generated by the excessive heat generating portion 31 is the largest, and the heat is selectively excessively generated. And if it continues to generate heat as it is, it discharges between the tip 31a or the vicinity thereof and the tip 31b or the vicinity thereof, and the excessive heat generating portion 31 is broken by fusing due to the discharge, thereby the safety mechanism works and the electromagnetic The cooker stops.
In contrast, during normal use in which the object to be heated is accommodated in the container body 2, heat is transferred from the excessive heat generating part 31 to the object to be heated, so that the heat generation of the excessive heat generating part 31 is suppressed. .

  Here, FIG. 3 has shown the site | part corresponded to the BB cross section of FIG.2 (b). In the example shown in FIG. 3, the leading ends 31 a and 31 b of the rising pieces 310 a and 310 b or the vicinity thereof are folded inward in consideration of the spark caused by the discharge and the influence of scattering of the fragments of the induction heating heating element 3. .

  In addition, the induction heating heating element 3 in the present embodiment includes the main part 30, the support part 32, and the excessive heating part 31, and thus the overall shape of the induction heating heating element 3 can be arbitrarily set. . Therefore, there is no part that becomes excessively hot at the time of normal use compared to other parts. Therefore, the induction heating heating element 3 as a whole can be effectively heated so that the heating efficiency is not impaired. In addition, the container body 2 is effectively prevented from being damaged by heat, and is commercially available. The object to be heated can be heated safely and easily by the electromagnetic cooker.

Further, the excessive heat generating portion 31 is formed away from the main portion 30 of the induction heating heat generating body 3 via the support portion 32. For this reason, it is possible to effectively avoid the main portion 30 of the induction heating heat generating member 3 from being damaged by the heat generated by the excessive heat generating portion 31.
At this time, the separation distance h of the excessive heat generating portion 31 with respect to the main portion 30 of the induction heating heat generating member 3 is preferably 0.5 to 10 mm.

  In addition, when the tips 31a and 31b of the rising pieces 310a and 310b are overlapped and folded back, it is preferable that at least a part of the opposing surfaces of the rising pieces 310a and 310b at the portion to be the support portion 32 is bonded. In the illustrated example, the first bonding portion 311 and the second bonding portion 312 bond the opposing surfaces of the portion to be the support portion 32, but the entire opposing surfaces of the corresponding portion may be bonded.

Thus, the workability | operativity at the time of forming the excessive heat_generation | fever part 31 can be improved by adhere | attaching the opposing surfaces of the site | part used as the support part 32, and preventing both from separating | separating. At this time, it is preferable that the time when the facing surfaces of the part are bonded is before the upper edge of the rising portion 310 is cut. Thereby, when forming the excessive heat generating part 31, it becomes easy to align the front-end | tips 31a and 31b side of the standing piece 310a and 310b, and the workability | operativity can be improved more.
In the illustrated example, the first adhesive portion 311 also serves as a positioning means when the excessive heat generating portion 31 is formed. The position where the first bonding portion 311 is formed is determined according to the separation distance h of the excessive heat generating portion 31 with respect to the main portion 30 of the induction heating heat generating body 3.

Moreover, if the opposing surfaces of the site | part used as the support part 32 are adhere | attached along a longitudinal direction, to-be-heated material will permeate into the excessive heat generating part 31 through between the opposing surfaces of the site | part used as the support part 32 Can be prevented.
In the present embodiment, in the process in which the object to be heated boils and decreases, the excessive heat generating part 31 is exposed on the liquid surface of the object to be heated, and thereby, the heat generating part in which the heat flow to the object to be heated is interrupted. It can also be used in a usage mode in which the electromagnetic cooker 31 can be automatically stopped at a predetermined timing when 31 heats up excessively and breaks. In the case of using in such a usage mode, it is not preferable that an object to be heated enters the excessive heat generating portion 31 and takes away the heat of the excessive heat generating portion 31, but the opposing surfaces of the portions to be the support portions 32 are not provided. Such a problem can be avoided by bonding.
In addition, in using for the said utilization aspect, it is preferable to attach the induction heating heat generating body 3 to the container main body 2 so that the site | part in which the excessive heat generating part 31 was formed becomes higher than another site | part. For this purpose, for example, a corresponding portion of the inner bottom surface 21 of the container main body 2 is raised, and the induction heating heating element 3 may be attached so that the excessive heat generating portion 31 is located at the raised portion.

  In addition, as shown in FIG. 4, a part of the support portion 32 can be projected to the side to form the side projection 33. In this way, in the above utilization mode, when the excessive heat generating portion 31 is exposed on the liquid surface of the object to be heated, the boiling heated object is prevented from scattering toward the excessive heat generating portion 31. Can do. Thereby, it can be avoided that the heat of the excessive heat generating portion 31 is taken away by the scattered object to be heated.

  Although the present invention has been described with reference to the preferred embodiment, it is needless to say that the present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the present invention. .

  For example, in the embodiment described above, the hole 4 formed in the approximate center of the induction heating heating element 3 is for facilitating breakage in the excessive heat generating portion 31. The circular shape as shown in the drawing is not limited. For example, it may be formed in an elliptical shape or may be formed by cutting slits radially. Further, the hole 4 may be formed at a position eccentric from the center of the induction heating heating element 3.

  In the above-described embodiment, an example in which one set of the excessive heat generating portion 31 and the support portion 32 is formed is described. However, a plurality of sets of the excessive heat generating portion 31 and the support portion 32 may be formed. For example, when the rising portion 310 is formed by bending a conductive material such as an aluminum foil as described above, the similar rising portion 310 is formed on the opposite side of the punched hole 4. Then, the upper edge of the rising portion 310 formed on the opposite side is also cut, and the leading ends 31a and 31b of the rising pieces 310a and 310b are overlapped and folded in the same manner as described above to return the excessive heat generating portion 31 and the support portion. 32 may be formed. In this way, it is possible to form two sets of the excessive heat generating portion 31 and the support portion 32 at the same time.

  As described above, the present invention provides an induction heating heating element and an induction heating container that can heat an object to be heated safely and easily with a commercially available electromagnetic cooker.

It is explanatory drawing which shows the outline of embodiment of the induction heating container which concerns on this invention. It is explanatory drawing which shows the formation process of embodiment of the induction heating heat generating body which concerns on this invention. It is explanatory drawing which shows the formation process of embodiment of the induction heating heat generating body which concerns on this invention. It is explanatory drawing which shows the modification of embodiment of the induction heating heat generating body which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Container 2 Container main body 3 Induction heating heating element 30 Main part 31 Excessive heat generation part 31a Tip 31b Tip 310a Standing piece 310b Standing piece 311 First adhesion part 312 Second adhesion part 32 Support part 33 Side protrusion part

Claims (6)

An induction heating heating element that generates heat when an eddy current is induced by a high-frequency magnetic field,
A planar main part;
A support portion rising along a direction from the center side of the main portion toward the outer edge side;
An induction heating heating element comprising an excessive heating part formed at a distal end side of the support part and spaced from the main part.   The predetermined part of the main part is divided along the direction from the center side toward the outer edge side, leaving the base side of a pair of rising pieces rising in parallel from one of the divided edge parts and the other edge part. The induction heating heating element according to claim 1, wherein the excessive heat generating portion is formed by overlapping and folding the leading end side of each rising piece, and the remaining portion on the base side of each rising piece is used as the support portion.   The induction heating heating element according to claim 2, wherein at least a part of the opposed surfaces of the rising piece at the portion to be the support portion is bonded.   The induction heating heating element according to any one of claims 1 to 3, wherein a side projecting portion is formed on the support portion.   The induction heating heating element according to any one of claims 1 to 4, wherein the excessive heat generating portion selectively generates excessive heat and breaks under a predetermined condition. An induction heating heating element that generates heat by inducing eddy currents by a high-frequency magnetic field is attached to the inner bottom side of the container body,
The induction heating heating element includes a planar main portion, a support portion that rises in a direction from the center of the main portion toward the outer edge, and an excessive heat generation portion that is formed on the distal end side of the support portion. A feature of the induction heating container.

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