WO2007088838A1

WO2007088838A1 - Induction heating container

Info

Publication number: WO2007088838A1
Application number: PCT/JP2007/051460
Authority: WO
Inventors: Takayuki Aikawa; Hagino Fujita; Yoshitaka Yamamoto; Soichi Kawakami
Original assignee: Toyo Seikan Kaisha, Ltd.
Priority date: 2006-01-31
Filing date: 2007-01-30
Publication date: 2007-08-09
Also published as: JPWO2007088838A1

Abstract

An induction heating container has a container body (10) having a sidewall section (11) and a bottom section (12) and also has a heat producing body (20) for induction heating, formed in a similar shape as an inner surface shape of the container body (10) and having a sidewall section (21) and a bottom section (22). An engagement section (23) is formed on the upper end edge side of the heat producing body (20), and the engagement section (23) is engaged with a recess (13) formed in the container body (10) or with the peripheral edge of the opening of the container body (10). Thus the heat producing body (20) is attached to the container body (10) with a gap (30) formed between the container body (10) and the heat producing body (20), and as a result, damage to the container body (10) by heat emitted from the heat producing body (20) is prevented.

Description

Specification

Induction heating vessel

Technical field

The present invention relates to an induction heating container provided with an induction heating heating element in which 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 heat is generated by the Joule heat. Background art

[0002] In recent years, in place of cooking appliances that have been mainly gas appliances, cooking appliances generally referred to as electromagnetic cookers have been developed from the viewpoint of safety, cleanliness, convenience, economy, etc. It has become widespread not only for business purposes but also in general households.

However, this type of electromagnetic cooker generates a high-frequency magnetic field by an electromagnetic induction heating coil provided inside, and heats the object to be heated by Joule heat generated by the induced eddy current. is there. For this reason, cooking can be performed without using a flame, but on the principle, the cooking utensils that can be used are limited, and special cooking utensils made of magnetic metals such as iron and iron enamel must be used. There was a disadvantage of not becoming.

[0004] Under these circumstances, various containers made of nonmagnetic materials that can be used in an electromagnetic cooker have been proposed as solutions to overcome the disadvantages of the electromagnetic cooker described above.

For example, Patent Document 1 discloses a plastic container for an electromagnetic cooker in which a conductor is mounted on the bottom. Patent Documents 2 to 5 disclose an induction heating cooking container provided with a heating element that generates heat by electromagnetic induction.

Patent Document 1: Japanese Patent Laid-Open No. 9174557

Patent Document 2: Japanese Patent Publication No. 2005-168648

Patent Document 3: Japanese Patent Publication No. 2004-329748

Patent Document 4: Japanese Patent Publication No. 2003-125928

Patent Document 5: Japanese Patent Application Laid-Open No. 2002-324659

Disclosure of the invention Problems to be solved by the invention

[0006] However, the container of Patent Document 1 is such that the container is formed in a state of being completely supported without exposing the conductor to the surface.

Therefore, in the configuration disclosed in Patent Document 1, all of the heat generated by the conductor reaches the container, which may damage the container. Therefore, as a plastic material for forming the container, Patent Document 1 In addition to being limited to unsaturated polyesters and heat-resistant resins such as melamine resins, it is difficult to separate the conductors embedded during disposal. Have it.

[0007] On the other hand, in Patent Document 2, a separate heating element is fixed to the container body by bonding or the like, and it seems that the problem as in Patent Document 1 in which a conductor is embedded is solved. However, as long as the heating element is in contact with the container body, damage to the container body due to the heat generated in the heating element is inevitable.

[0008] Further, in Patent Document 3, an engagement protrusion is formed at a position above a predetermined height from the bottom of the inner peripheral surface of the body portion, and functions as a restricting means for restricting the rise of the heating element. Shown is the embodiment with the body attached to the bottom of the container body.

However, even with the configuration disclosed in Patent Document 3, the contact between the heating element and the container body cannot be eliminated at all, and the container body may be damaged at the contact portion with the heating element. I still have it.

[0009] Further, Patent Document 4 describes a mode in which a heating element is placed on a pedestal and is lifted from the bottom of the container main body, or a side surface of the container main body along with a heating coil from the container main body. In addition, a mode in which heating elements having a larger taper are stacked is shown, and Patent Document 5 shows a mode in which a heating element is supported by a circular protrusion formed at the center of the bottom surface of the container body.

Also in these embodiments, the container main body may be damaged because it is in contact with the container main body via a part force table or the like where the heating element is heated by the heating coil or directly. In addition, if the heating element itself is not rigid, the heating element cannot be structurally attached to the container body. For example, it is practically difficult to use a heating element made of a thin material such as a metal foil. .

The present invention has been made in view of the above circumstances, and eddy currents are induced by a high-frequency magnetic field. The purpose of the induction heating container is to prevent damage to the container body due to heat by devising the shape of the induction heating element and its mounting method when attaching the induction heating element that generates heat to the container body. To do.

Means for solving the problem

[0011] An induction heating container according to the present invention that solves the above-mentioned problems is an induction heating container in which an induction heating heating element that generates heat when an eddy current is induced by a high-frequency magnetic field is attached to the container body, and the induction heating container The heating element has a bottom part and a locking part, and is shaped so that at least the bottom part of the induction heating heating element fits inside the container body, and the bottom part of the induction heating heating element is the container. The induction heating heating element is attached to the container main body so as to be spaced apart from the bottom of the main body and form a gap between the container main body and the induction heating heating element. The heating element can be formed, for example, so as to have a shape substantially similar to the inner shape of the container body.

[0012] According to the induction heating container according to the present invention adopting such a configuration, even if the engagement portion of the induction heating heating element contacts the container body, the influence of heat can be ignored. Damage to the main body due to heat can be prevented. In addition, the container body can be formed of a general-purpose non-magnetic material, so that a low-cost container that can be used in an electromagnetic cooker can be easily provided, and the container body and induction heating heat generation during disposal processing can be provided. Separation from the body is also easy.

[0013] In order to attach the induction heating heating element to the container main body, for example, the engaging part of the induction heating heating element is locked to the opening edge of the container main body, or the locking part of the induction heating heating element is used. In the latter case, which may be attached to the side wall portion of the container body, the engaging portion of the induction heating heating element is engaged with a recess formed on the inner surface of the side wall portion of the container body. You may make it stop.

[0014] In addition, the induction heating container according to the present invention may have a configuration in which the induction heating heating element is subjected to bellows-like folding.

With such a configuration, the surface area of the induction heating heating element is increased, and the heat exchange performance can be improved. Therefore, the time required for heating the heating target can be shortened. [0015] In addition, the induction heating container according to the present invention provides a bottom portion of the induction heating heating element in order to increase the strength of the induction heating heating element, particularly the strength at the boundary between the side wall and the bottom of the induction heating heating element. Are continuous with the valley folds of the side wall of the induction heating heating element, and the valley folds of the bottom of the induction heating heating element are folds of the side wall of the induction heating heating element. It can be set as the structure which gave the folding process so that it may follow.

[0016] In addition, the induction heating container according to the present invention may have a configuration in which one or two or more convection holes are provided in the induction heating heating element.

With such a configuration, the object to be heated convects, so that heat exchange is easily performed between the induction heating heating element and the object to be heated, and heat storage due to residence of the object to be heated is prevented. Damage to the container body due to heat can be avoided more effectively.

The invention's effect

[0017] As described above, according to the present invention, since the portion where the induction heating heating element that generates heat by the high frequency magnetic field contacts the container body is limited, the container body is damaged by the heat generated by the induction heating heating element. Can be prevented.

Brief Description of Drawings

FIG. 1 is a schematic cross-sectional view showing an embodiment of an induction heating container according to the present invention.

FIG. 2 is a schematic sectional view showing a modification of the induction heating container according to the present invention.

FIG. 3 is a schematic sectional view showing a modification of the induction heating container according to the present invention.

FIG. 4 is a cross-sectional view of a main part showing another modification of the induction heating container according to the present invention.

FIG. 5 is a cross-sectional view of a main part showing another modification of the induction heating container according to the present invention.

FIG. 6 is a cross-sectional view of the main part showing another modification of the induction heating container according to the present invention.

FIG. 7 is a partially omitted perspective view showing an outline of an example of an induction heating heating element in an embodiment of the induction heating container according to the present invention.

FIG. 8 is a schematic sectional view showing another embodiment of the induction heating container according to the present invention.

FIG. 9 is an explanatory view showing a modification of the induction heating heating element.

FIG. 10 is an explanatory view showing another modification of the induction heating heating element.

Explanation of symbols

[0019] 1 induction heating vessel 10 Container body

11 Side wall

12 Bottom

13 recess

20 Induction heating heating element

21 Side wall

21a Mountain fold

21b Valley fold

22 Bottom

22a Mountain fold

22b Valley fold

23 Locking part

30 Air gap

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic sectional view showing an embodiment of the induction heating container according to the present invention.

[0021] The induction heating container 1 shown in FIG. 1 has a container body 10 having a side wall part 11 and a bottom part 12, and an inner surface shape of the container body 10 that is substantially similar to the inner shape of the container body 10. An induction heating heating element 20 having a side wall portion 21 and a bottom portion 22 is formed to be formed as described above.

[0022] In the present embodiment, the induction heating heating element 20 can generate heat due to eddy currents induced by a high frequency magnetic field generated from an electromagnetic induction heating coil provided in an electromagnetic cooker or the like, and due to its electrical resistance, it generates Jule heat. Conductive materials such as aluminum, nickel, gold, silver, copper, platinum, iron, cobalt, tin, zinc, etc., or alloys thereof, or conductive materials such as resin film or paper with conductivity are used. be able to. More specifically, for example, when aluminum is used as the metal material, the induction heating heating element 20 can be formed using an aluminum foil having a thickness of about 0.10 to 100 μm. [0023] Here, when the induction heating heating element 20 is attached to the container body 10, if the induction heating heating element 20 that generates heat by the high-frequency magnetic field is in contact with the container body 10, the induction heating heating element 20 is emitted. The container body 10 is damaged by heat.

That is, since the heating coil provided in a general electromagnetic cooker is flat, it can be efficiently heated if the induction heating heating element 20 is arranged near the bottom of the container body 10 so as to be close to the heating coil, but the high temperature induction heating heat generation is possible. If the body 20 comes into contact with the container body 10, there is a risk of damaging the container body 10.

For this reason, in this embodiment, the attachment means of the induction heating heating element 20 is devised to prevent damage to the container body 10 due to heat. In particular, the container body 10 can be reliably prevented from being damaged by separating the bottom of the induction heating heating element 20 that reaches the highest temperature and the bottom of the container body 10 so as not to contact each other.

Specifically, as shown in FIG. 1, an engaging portion 23 is formed on the upper edge side of the induction heating heating element 20, and a recess 13 is formed at a corresponding position on the inner surface of the container body 10. Thus, the locking portion 23 of the induction heating heating element 20 is locked to the recess 13 of the container body 10. As a result, the induction heating heating element 20 is attached to the container body 10 such that a gap 30 is formed between the container body 10 and the induction heating heating element 20.

[0026] If the induction heating heating element 20 is attached to the container body 10 in this way, the bottom 22 of the induction heating heating element 20 that generates a large amount of heat and the lower side force container body of the side wall 21 in the vicinity thereof It floats from 10 and is not in contact with the container body 10. On the other hand, the upper end edge of the induction heating element 20 where the locking part 23 is formed has a small amount of heat or hardly generates heat. For this reason, even if the locking portion 23 formed on the upper edge of the induction heating element 20 contacts the container body 10, the influence of heat can be ignored, and damage to the container body 10 due to heat can be prevented. Can do.

[0027] Further, if the lower side force of the bottom portion 22 of the induction heating heating element 20 and the side wall portion 21 in the vicinity thereof can be lifted from the container body 10, the recess 13 is formed in the container body 10. It may be omitted. In this case, the induction heating heating element 20 is lifted from the container body 10 by, for example, adhering a locking portion 23 formed on the upper edge of the induction heating heating element 20 to the side wall 11 of the container body 10. The top end of the induction heating heating element 20 may be The locking part 23 formed on the edge side may be locked to the opening edge of the container body 10.

In the latter case, for example, as shown in FIG. 2, the periphery of the locking portion 23 may be suspended and locked to the opening peripheral edge of the container body 10 as shown in FIG. Alternatively, a flange 14 may be provided at the peripheral edge of the opening of the container body 10, and the locking portion 23 may be locked to the peripheral edge of the opening of the container main body 10 so as to follow the flange 14.

2 and 3 are schematic cross-sectional views showing the modified examples.

[0029] When the locking portion 23 is locked to the flange 14 provided on the peripheral edge of the opening of the container body 10, the locking portion 23 is flanged via the adhesive layer 15 as shown in FIG. It may be fixed to 14. As shown in FIG. 4 (b), the protrusion 14a provided on the top surface of the flange 14 may be fixed by being inserted into the insertion hole 23a formed in the locking portion 23.

[0030] Furthermore, when the container body 10 is used in such a manner that the opening of the container body 10 is covered with a member 10a such as a lid, as shown in FIG. The locking part 23 can also be pinched. In this case, as shown in FIG. 5 (b), it is possible to more effectively prevent the locking portion 23 from falling off by bending the portion that holds the locking portion 23. Further, between the peripheral edge of the member 10a and the flange 14, as shown in FIG. 5 (c), other members 10b such as an inner lid tray can be sandwiched together with the locking portion 23. .

[0031] Further, the member 10a such as a lid that covers the opening of the container body 10 has a fitting shape as shown in FIGS. 6 (a) to 6 (d) with respect to the opening periphery of the container body 10. The peripheral edge can also be fitted, and at this time, the locking part 23 can be more effectively prevented from falling off even if the locking part 23 is squeezed into the fitting part. it can.

4 to 6 are main part cross-sectional views showing the above-described modifications, and correspond to portions surrounded by a chain line in FIG.

[0033] Thus, in the induction heating container 1 of the present embodiment, it is not necessary to consider the damage to the container body 10 due to the heat generated by the induction heating heating element 20, and therefore the material forming the container body 10 Therefore, characteristics such as heat resistance are not required. Therefore, for example, in addition to widely used expanded polystyrene as a conventional container for instant foods, polyester resins such as polyethylene terephthalate, polyolefin resins such as polypropylene, etc. By forming the container body 10 from various general-purpose nonmagnetic materials such as paper and glass, synthetic resin materials such as polyamide-based resins, a low-cost container that can be used in an electromagnetic cooker can be obtained. Can be provided easily.

In addition, the induction heating heating element 20 is configured such that the locking portion 23 formed on the upper edge side is locked to the recess 13 formed in the container body 10 or the opening edge of the container body 10, thereby It is attached to 10 and it is easy to separate the container main body 10 and the induction heating heating element 20 at the time of disposal.

[0034] As described above, in the present embodiment, a force induction heating element 20 that prevents damage to the container body 10 due to heat by devising a means for attaching the induction heating element 20 to the induction heating element 20 includes In order to increase the surface area to improve the heat exchange performance and shorten the time required for heating the object to be heated, it is preferable to perform a bellows-like folding process as shown in FIG.

In FIG. 7, a part of the induction heating heating element 20 is shown in the drawing, and the other parts are not shown.

[0035] Further, the strength at the boundary between the side wall portion 21 and the bottom portion 22 of the induction heating element 20 tends to be mechanically or electrically weak and easily damaged. Therefore, when performing such folding processing, as shown in the figure, the mountain fold portion 22a of the bottom portion 22 of the induction heating heating element 20 is continuous with the valley fold portion 21b of the side wall portion 21 of the induction heating heating element 20. In addition, it is preferable to perform a folding process so that the valley fold 22b of the bottom 22 of the induction heating heating element 20 is continuous with the mountain fold 21a of the side wall 21 of the induction heating heating element 20.

[0036] Thereby, at the boundary between the side wall portion 21 and the bottom portion 22 of the induction heating heating element 20, the mountain fold portion 21a of the side wall portion 21 enters between the adjacent mountain fold portions 22a formed at the bottom portion 22. The mountain folds 22a of the bottom 22 and the mountain folds 21a of the side wall 21 are alternately arranged to increase the strength at the boundary between the side wall 21 and the bottom 22 of the induction heating element 20. Can.

Similarly, at the boundary between the side wall portion 21 and the locking portion 23 of the induction heating heating element 20, the mountain-folded portion 23 a of the locking portion 23 of the induction heating heating element 20 is also the induction heating heating element 20. The valley folds 21b of the side wall 21 of the induction heating heating element 20 are continuous with the valley folds 21b of the side wall 21 of the induction heating heating element 20. To fold As a result, the strength at the boundary between the side wall portion 21 and the locking portion 23 of the induction heating heating element 20 can be increased.

[0038] In order to obtain the induction heating element 20 subjected to such folding processing, for example, it has an uneven surface corresponding to the mountain folds 21a, 22a, 23a and the valley folds 21b, 22b, 23b. A pair of male and female conical rollers (conical profiler) is used, and if necessary, convection holes 24 are drilled in the center, and a conductive material as described above is sandwiched between the rollers. Just rotate it while pressing it. Then, if the boundary between the side wall 21 and the bottom 22 and the boundary between the side wall 21 and the locking part 23 are bent, an induction heating heating element 2 as shown in the figure is obtained.

[0039] In the present embodiment, particularly when the heating object is a liquid, the heating object is retained in the gap 30 formed between the container body 10 and the induction heating heating element 20. In order to prevent this, a convection hole 24 is provided at an arbitrary position of the induction heating heating element 20 (in the illustrated example, almost at the center of the bottom 22), and the induction heating heating element 20 has a back surface and a front surface side. It is preferable to keep the heated object easy to convection.

In the case where the convection hole 24 is provided at substantially the center of the bottom portion 22 of the induction heating heating element 20, from the viewpoint of preventing electrical damage to the edge portion of the convection hole 24, as shown in FIG. It is preferable to have a shape in which the end edge portion of this is raised.

[0040] Further, in order to facilitate the convection of the object to be heated, more specifically, the induction heating heating element 20 can be configured as shown in FIG. 9 and FIG.

That is, FIG. 9 and FIG. 10 each show a modified example of the induction heating heating element 2, and the modified example shown in FIG. 10 is different from the modified example shown in FIG. The force at the point where the part is raised In any of the modifications, a convection hole 24 is provided in the bottom part 22 of the induction heating element 20 and a notch part 25 is formed by notching the side wall part 21 from the upper edge side. The deepest portion 25a is provided so as to be located below the liquid level of the object to be heated (indicated by a chain line in the figure). By doing in this way, the convection of the heating object accommodated in the induction heating container 1 can be made better.

FIGS. 9 (a) and 10 (a) are schematic plan views of the state where the induction heating heating element 20 is attached to the container body 10, and FIGS. 9 (b) and 10 (b) Induction heating heating element 20 FIG.

[0041] In this way, if the convection of the heating object is promoted, heat exchange between the induction heating heating element 20 and the heating object is facilitated, and the retention of the heating object is facilitated. It is possible to prevent heat storage due to heat and more effectively avoid damage to the container body 10 due to heat.

[0042] Further, when a high-frequency magnetic field is applied in a state where the object to be heated is not accommodated in the induction heating container 1, and the so-called empty state is generated, the induction heating heating element 20 generates excessive heat, Although it is conceivable that the induction heating heating element 20 is melted and destroyed, in this embodiment, the melting and destruction of the induction heating heating element 20 due to such emptying can be effectively avoided. The induction heating heating element 20 is attached in a state of being suspended from the container body 10 by locking the locking part 23 formed on the upper edge of the induction heating element 20 to the recess 13 of the container body 10. By appropriately adjusting the flexibility of each part of the induction heating element 20, the induction heating element 20 is deformed by the repulsive force of the induced eddy current when a high frequency magnetic field is applied without accommodating the object to be heated. While electromagnetic induction It pushed up away from the heating coil, heating of the induction heating body 20 can by hindered Unisuru.

[0043] While the present invention has been described with reference to the preferred embodiments, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the present invention. Needless to say, les.

For example, the locking portion 23 formed on the upper end edge side of the induction heating heating element 20 is formed in an annular shape along the circumferential direction of the induction heating heating element 20 or along the circumferential direction of the induction heating heating element 20. The container main body 10 and the induction heating heating element 20 can be connected to each other by locking the locking part 23 to the recess 13 or the peripheral edge of the opening, such as by forming a plurality of locking parts 23 at equal intervals. If the induction heating heating element 20 can be attached to the container body 10 so that a gap 30 is formed between them, the locking portion 23 formed on the induction heating heating element 20 or the container body 10 is formed. The specific mode of the recess 13 is not particularly limited.

[0045] Further, as a usage form of the induction heating container 1 according to the present invention, the container body 10 is heated. In addition to directly heating the object to be heated and boiling it, the water contained in the container body 10 is heated and boiled, and the object to be heated is steamed by the steam generated at this time. Say it with a word.

Industrial applicability

As described above, the present invention eliminates the disadvantages of an electromagnetic cooker that requires the use of a dedicated cooking utensil, and provides an induction heating container equipped with an induction heating heating element that generates heat when an eddy current is induced by a high-frequency magnetic field. provide.

Claims

The scope of the claims

An induction heating container in which an induction heating heating element that generates heat when an eddy current is induced by a high frequency magnetic field is attached to the container body,

The induction heating heating element has a bottom portion and a locking portion, and is shaped so that at least the bottom portion of the induction heating heating element fits inside the container body,

The induction heating heating element is attached to the container body so that the bottom of the induction heating heating element is separated from the bottom of the container body and a gap is formed between the container body and the induction heating heating element. An induction heating container characterized by that.

2. The induction heating container according to claim 1, wherein a locking portion of the induction heating heating element is locked to an opening edge of the container body.

The induction heating container according to claim 1, wherein a locking portion of the induction heating heating element is attached to a side wall portion of the container main body.

4. The induction heating container according to claim 3, wherein the engaging portion of the induction heating heating element is engaged with a recess formed on an inner surface of the side wall portion of the container body.

5. The induction heating container according to claim 1, wherein the induction heating heating element is formed so as to have a shape substantially similar to the inner surface shape of the container main body.

The induction heating container according to any one of claims 1 to 5, wherein the induction heating heating element is subjected to bellows-like folding.

A mountain fold at the bottom of the induction heating heating element is continuous with a valley fold at the side wall of the induction heating heating element, and a valley fold at the bottom of the induction heating heating element is the induction heating heating element. 7. The induction calorie heat vessel according to claim 6, wherein the induction calorie container is folded so as to be continuous with the mountain fold portion of the side wall portion.

The induction heating container according to any one of claims 7 to 7, wherein the induction heating heating element is provided with one or more convection holes.