JP4579462B2 - Induction heating cooking container - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an induction heating cooking container capable of heating contents by an induction heating cooker using induction heating.
[0002]
[Prior art]
This type of induction heating cooking container includes a heating element that generates heat by electromagnetic induction. When the container is placed on the induction heating cooker and a current is passed through the induction heating coil, a high frequency magnetic field is generated. As a result, an eddy current is induced in the heating element, and the heating element generates heat due to resistance loss due to the eddy current, thereby warming the contents.
[0003]
[Problems to be solved by the invention]
Recently, it has been proposed that the container body is made of a non-conductive material such as plastic or paper, and a heating element is fixed to the outer or inner surface of the bottom, or a heating element is built in the bottom. Yes.
[0004]
However, since the heating element is fixed and in close contact with the bottom of the container body, the bottom of the container body may be excessively heated when the heating element continuously generates heat due to continuous energization.
[0005]
Then, this invention is made | formed in view of the said conventional problem, and makes it a subject to provide the container for induction heating cooking which can prevent an overheating beforehand.
[0006]
[Means for Solving the Problems]
The present invention has been made to solve the above problems, and an induction heating cooking container according to the present invention includes a bottomed cylindrical container body made of a non-conductive material, and a heating element that generates heat by electromagnetic induction. In the induction heating cooking container provided with the heating element, the heating element is arranged inside the container body so as to be movable up and down, and the heating element is generated by bubbles of water vapor generated when the liquid such as water placed in the container body is heated. Is configured to rise against its own weight, and the heating element is placed on the bottom inner surface of the container body before heating, and is attached to at least one of the bottom inner surface of the container body and the lower surface of the heating element. It characterized that you have formed a plurality of recesses recessed from the surface.
[0007]
When such a container is placed on an induction heating cooker and heated, a liquid such as water placed in the container body is heated by the heating element to generate water vapor bubbles, and the heating element is raised by the bubbles. When the heating element rises, the distance from the induction heating coil of the induction heating cooker increases, and therefore the heating value of the heating element decreases. On the other hand, when the generation of bubbles becomes weak, the heating element descends due to its own weight, and the heat generation amount of the heating element increases.
[0008]
The liquid such as water may be previously stored in the container body or may be stored in the container body during cooking.
In addition to water itself, liquids such as water include those containing moisture such as coffee, juice, milk and other beverages and soups, and can generate water vapor bubbles when heated. .
The non-conductive material is a material that does not generate heat due to electromagnetic induction, and is, for example, paper or plastic.
[0009]
In addition, the heating element is preferably placed on the bottom inner surface of the container body before heating, and at least one of the bottom inner surface of the container body and the lower surface of the heating element is preferably formed with a recess. In this case, the heating element floats from the bottom due to the bubbles, and therefore, overheating of the bottom is prevented. Further, the liquid such as water is easily interposed between the inner surface of the bottom portion and the heating element due to the concave portion, and the heating element floats smoothly from the bottom due to the bubbles generated from the liquid present.
[0010]
Furthermore, it is preferable to provide a restricting means for preventing the heating element from rising above a predetermined height, so that the heating element is prevented from coming off from the container body. Also, when the heating element rises and exceeds the upper heating limit line, it is detected and the power is turned off, or the induction heating cooker configured to stop energizing the induction heating coil is used. You can also.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, with reference to FIG. 1 and FIG. 2, an embodiment of an induction heating cooking container according to the present invention includes a bottomed cylindrical container body 1 having an upper surface opening and a heating element 2 that generates heat by electromagnetic induction. The container for induction heating cooking will be described.
[0012]
The container body 1 includes a barrel portion 3 that expands upward in a substantially tapered shape, a substantially flat plate-like bottom portion 4 formed integrally with the barrel portion 3, and an upper end portion of the barrel portion 3. And a flange portion 5 formed over the entire circumference.
On the outer peripheral surface of the body portion 3, vertical ribs 6 are formed in a radial shape, and the flange portion 5 is formed in a substantially U shape in a sectional view. The body 3 is formed such that an upper body 3a and a lower body 3b are connected in a stepped manner via a horizontal annular connecting portion 7, and an auxiliary piece 8 is provided at the lower end of the upper body 3a. It extends downward so as to have a predetermined gap with the body portion 3b.
An annular locking projection 9 is formed on the inner peripheral surface of the lower body 3 at a predetermined height above the bottom 4. The lower body 3 is formed with a substantially constant diameter from the locking projection 9 to the bottom 4. A plurality of concave portions 10 such as grooves are provided on the inner surface 4 a of the bottom portion 4. Note that the locking projection 9 (projection) may not be annular.
[0013]
The container body 1 having such a structure is formed by injection molding from a thermoplastic resin. Examples of the thermoplastic resin include polypropylene, high-density polyethylene, polyethylene terephthalate, polycarbonate, polyamide, and polystyrene. In particular, polypropylene (including polypropylene resins such as propylene-ethylene copolymers) is preferable because it is light and has high mechanical strength, is relatively inexpensive, has high heat resistance and heat distortion temperature, and is excellent in heat resistance. . However, the material of the container body 1 is not limited to these, and other than the synthetic resin, for example, a non-conductive material such as paper can be used. In particular, if it is made of synthetic resin or paper, it is light and incinerated. Since it is relatively easy, it is preferable as a disposable container. Further, the container body 1 may be formed by sheet molding instead of injection molding, and a cylindrical label such as a shrink label may be attached to the outside of the body portion 3.
[0014]
The heating element 2 is accommodated in the container body 1 so as to be movable up and down. The heating element 2 is made of a conductive material, for example, a metal material such as iron, stainless steel, chromium, aluminum, or copper, or a non-metal material such as carbon. In particular, iron and stainless steel are preferable because of high heat generation efficiency. In addition, the heat generating body 2 whole may not be an electroconductive material, and at least one part should just be formed from the electroconductive material.
[0015]
In the present embodiment, the heating element 2 is formed in a plate shape, specifically, a disk shape having a substantially constant thickness. Although the thickness of the heating element 2 depends on the specific gravity of the material and the size of the container, for example, in the case of iron or stainless steel, it is preferably about 0.05 to 1.0 mm, and particularly about 0.1 to 0.3 mm. preferable.
[0016]
The heating element 2 is arranged below the locking projection 9 and is placed in a state where the lower surface 2b is in contact with the bottom inner surface 4a (lower limit position) as shown by a solid line in FIG. As indicated by a two-dot chain line in FIG. 1, the upper surface 2 a peripheral edge portion can move up and down up to an upper limit position in contact with the locking projection 9. That is, the locking protrusion 9 is a restricting means for preventing the heating element 2 from rising above a predetermined height, and the heating element 2 cannot be easily removed from the container body 1 by the locking protrusion 9. However, if a locking projection 9 (including a non-annular one) is provided as a restricting means, the heating element 2 is removed from the container body while forcibly pulling the heating element 2 by hand and destroying the locking projection 9. It is also possible to pull it out from 1, which is convenient for separation and disposal.
[0017]
A use state of the container configured as described above will be described. First, as usual (before heating), as shown by a solid line in FIG. 1, the heating element 2 is placed on the bottom inner surface 4a of the container body 1 by its own weight, and the flat lower surface 2b is the bottom inner surface 4a. Is in contact with A liquid to be cooked, such as water V, is placed in the container, and the container is placed on an induction heating cooker to start heating. In addition, since the recessed part 10 is formed in the bottom part inner surface 4a of the container main body 1, water penetrate | invades into the recessed part 10. FIG. Then, the heating element 2 generates heat by the Joule heat of the eddy current and the water is gradually heated, and as shown in FIG. 2, steam bubbles B are generated as the temperature rises. As the temperature of the water rises, the bubbles B are also generated vigorously, and in particular, many bubbles B are generated from the lower surface 2b of the heating element 2, so that the heating element 2 is pushed upward against its own weight by the rising movement of the bubbles B. As a result, the heating element 2 floats from the inner surface 4a of the bottom portion, and the upper surface 2a of the heating element 2 comes into contact with the locking projection 9 to stop its rise.
[0018]
In the induction heating cooker, when the heating element 2 moves away from the container mounting surface P and exceeds the heating upper limit line H1, it is detected and an alarm is automatically issued to turn off the power. There is something configured. Therefore, when the heating element 2 exceeds the heating upper limit line H1 as shown in FIG. 2, the energization to the induction heating coil is stopped and the cooking operation can be automatically completed. When the heat generation from the heating element 2 stops and the generation of the bubbles B disappears or weakens, the heating element 2 returns to its original position, that is, onto the bottom inner surface 4a by its own weight.
[0019]
In this way, when water is heated and bubbles B are generated, the heating element 2 is separated from the bottom 4 and automatically stops over the heating upper limit line H1, so that the continuous heating state for a long time by continuous energization is maintained. Generation | occurrence | production can be prevented beforehand and the excessive heating of the container main body 1 by the continuous heating especially the bottom part 4 is prevented beforehand. This overheating prevention effect prevents the container from being damaged, and in particular, since the heating element 2 is separated from the bottom part 4, the damage to the bottom part 4 is more effective than the conventional structure in which the heating element 2 is in close contact with the bottom part 4. It can be prevented. In addition, since the cooking operation is automatically completed, it is possible to prevent the water that has been added from evaporating and becoming empty.
[0020]
Moreover, since the recess 10 is formed in the bottom inner surface 4a of the container body 1, water can be easily interposed under the heating element 2, and the heating element 2 is smoothly smoothed by the bubbles B of water vapor generated from the water. And can be raised stably.
[0021]
There is also an induction heating cooker configured to automatically stop energization of the induction heating coil, although the power supply is not turned off when the heating element 2 exceeds the heating upper limit line H1. In that case, when the heating element 2 exceeds the heating upper limit line H1, energization to the induction heating coil is stopped, and when the generation of the bubbles B is weakened due to the temperature drop of the water, the heating element 2 is lowered by its own weight. When the heating element 2 falls below the heating upper limit line H1, the energization is automatically resumed, the heating element 2 generates heat, the water is heated again, the generation of bubbles B becomes stronger, and the heating element 2 rises again. In this way, the heating element 2 moves up and down across the heating upper limit line H1, and thus energization and its stop are repeated, thereby enabling automatic temperature adjustment, preventing continuous heating, and cooking. The temperature of the water (contents) can be kept constant.
[0022]
On the other hand, when the heating upper limit line H2 is higher than the locking protrusion 9, in other words, when the locking protrusion 9 is lower than the heating upper limit line H2, there is a temperature adjustment effect. That is, the heat generation amount of the heating element 2 decreases as the heating element 2 moves away from the container mounting surface P of the induction heating cooker, so that the generation of bubbles B increases as the water temperature rises, and the heating element 2 rises. As a result, the amount of heat generation is reduced, thereby preventing excessive heating. Further, when the temperature of the water decreases due to the decrease in the heat generation amount, the heat generating body 2 descends and approaches the container mounting surface P, so the heat generation amount increases again.
[0023]
As described above, since the heating element 2 is lifted by using the bubbles B generated by heating, the heating element 2 swings up and down depending on the temperature of the water to adjust the amount of heat generation. Regardless of the height of the upper limit lines H1 and H2, the heating element 2 itself can be provided with a temperature adjusting function, and this function can prevent excessive heating.
[0024]
In the present embodiment, water is added at the time of cooking, but contents such as coffee and soup may be accommodated. In this case, the upper surface opening of the container body 1 is a lid such as a seal lid. It is preferable to seal with.
[0025]
Further, as shown in FIG. 3, for example, it can be used as a container for so-called instant food, which contains dry food W such as dry noodles and the upper surface opening of the container body 1 is detachably sealed with a seal lid 20. . When eating the contained dried food W, as shown by a two-dot chain line in FIG. 3, the seal lid 20 is peeled off halfway, opened, poured with water, placed on an induction heating cooker, and a heating element. Heat the water with an exotherm of 2. Therefore, it is not necessary to prepare hot water in advance, and cooking is easy.
[0026]
As shown in FIG. 3, instead of forming the recess 10 on the bottom inner surface 4 a of the container body 1, a recess 21 such as a groove may be formed on the lower surface 2 b of the heating element 2. The recesses 10 and 21 may be formed on both the 4a and the lower surface 2b of the heating element 2.
[0027]
Moreover, you may provide a partition as a control means. That is, as shown in FIG. 3, a partition plate 22 is provided at a position above the bottom 4 by a predetermined height, and the partition plate 22 prevents the heating element 2 from rising above a predetermined height. In this case, the inside of the container main body 1 is accommodated by a partition plate 22 (partition) so that the contents accommodating space 23 for accommodating contents such as dried food W such as dried noodles and the heating element 2 can be moved up and down. The heating element housing space 24 is partitioned. In this case, a large number of through holes 25 are formed in the partition plate 22 so that both the accommodation spaces 23 and 24 are communicated. Thus, by providing the partition plate 22, it is possible to prevent the contents such as dried food from being entangled with the heating element 2, the heating element 2 can be raised smoothly and stably, and the vertical swing motion is also easy. It becomes.
[0028]
Further, the heating element 2 may be provided with blades so that the heating element 2 is rotated by the bubbles B. For example, as shown in FIG. 4, the heating element 2 is formed in a thin disk shape, and a predetermined portion thereof is bent upward to form the inclined blade portion 30. When water is heated and water vapor bubbles B are generated, the bubbles B strike the inclined blade portion 30 through the through-hole 31 formed when the inclined blade portion 30 is bent, whereby the heating element 2 Ascends while rotating around the axis. By rotating the heating element 2, a liquid such as water is diffused, and the heating efficiency can be increased.
[0029]
As described above, the shape and the like of the heating element 2 can be appropriately changed, and the shape of the container body 1 may be a rectangular tube shape such as a quadrangle or a hexagon other than the cylindrical shape.
[0030]
Furthermore, various configurations of the restricting means can be employed, and a string that holds the heating element 2 to the bottom 4 or the like may be used in addition to the above-described plate having protrusions and holes.
[0031]
In the above-described embodiment, the heating element 2 was placed on the bottom inner surface 4a before heating, but the heating element 2 may be in a state separated from the bottom 4 by a predetermined distance before heating, Anyway, if it is the structure which rises from the position by the bubble B, the heat generating body 2 can be provided with a temperature adjustment function, and therefore, overheating can be prevented. However, if the heating element 2 is placed on the bottom inner surface 4a before heating, damage to the bottom 4 due to overheating can be effectively prevented.
[0032]
【The invention's effect】
As described above, since the heating element is raised by the bubbles, the heating element can be provided with a temperature adjusting function, and therefore, overheating can be prevented in advance.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a container for induction heating cooking according to an embodiment of the present invention.
FIG. 2 is a view showing the use state of the container.
FIG. 3 is a cross-sectional view showing an induction heating cooking container according to another embodiment.
4A and 4B show a container for induction heating cooking according to another embodiment, in which FIG. 4A is a plan view of a heating element used in the container, and FIG. 4B is a partial cross-sectional view showing a use state of the container.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Container main body, 2 ... Heat generating body, 2a ... Upper surface, 2b ... Lower surface, 3 ... Body part, 4 ... Bottom part, 4a ... Bottom part inner surface, 6 ... Rib, 9 ... Locking protrusion (regulation means), 10, 21 DESCRIPTION OF SYMBOLS ... Recessed part, 20 ... Seal lid (lid body), 22 ... Partition plate (regulating means), 23 ... Content accommodation space, 24 ... Heating body accommodation space, 25 ... Through-hole, 30 ... Inclined blade part (blade), 31 ... through holes, B ... bubbles, H1, H2 ... heating upper limit line, P ... container mounting surface, V ... water (liquid), W ... dried food (contents)

Claims (3)

In an induction heating cooking container provided with a bottomed cylindrical container body (1) made of a non-conductive material and a heating element (2) that generates heat by electromagnetic induction,
The heating element (2) is disposed inside the container body (1) so as to be movable up and down, and bubbles of water vapor (B generated when the liquid (V) such as water placed in the container body (1) is heated. ), The heating element (2) is configured to rise against its own weight, and the heating element (2) is placed on the bottom inner surface (4a) of the container body (1) before heating. , of the lower surface of the bottom inner surface of the container body (1) (4a) and the heating element (2) (2b), characterized that you have multiple recesses recessed from the surface to at least one (10, 21) is formed Induction heating cooking container. Induction heating cooking container of which claim 1 having a predetermined height above the regulating means for preventing the rise (9, 22) of the heating element (2). When the heating element (2) rises and exceeds the upper heating limit line (H1), it is detected and the power is turned off, or the induction heating cooking configured to stop energizing the induction heating coil The container for induction heating cooking according to claim 1 or 2, which is used in a vessel.

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