JP2003038345A - Container for induction heating cooking - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a container for induction heating cooking safer than that by a conventional container by suppressing the damage of the container due to useless heating. SOLUTION: In the container for induction heating cooking provided with a container main body in the shape of a bottomed cylinder consisting of non- conductive material and a heater for heating by electromagnetic induction, the heater is provided in a container main body and retreated to a retreating position for non-use time, and a heater retreating means moves the heater to a cooking position where a calorific value is larger than that at the retreating position from the retreating position them the liquid such as water is poured in the container main body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction heating cooking container capable of heating contents by an induction heating cooker utilizing induction heating.

[0002]

2. Description of the Related Art A container for induction heating and cooking of this kind is provided with a heating element that generates heat by electromagnetic induction. When the container is placed on an induction heating cooker and an electric current is passed through an induction heating coil of the cooker, A high frequency magnetic field is generated to induce an eddy current in the heating element, and the heating element generates heat due to resistance loss due to the eddy current, thereby warming the contents.

[0003]

By the way, recently,
It has been proposed that the container body is made of a non-conductive material such as plastic or paper, and the heating element is fixed to the outer surface or the inner surface of the bottom portion, or the heating element is built in the bottom portion. However, when so-called emptying is performed without putting liquid such as water in the container body during cooking, the heating element is in close contact with the bottom part of the container body in the conventional container, so the bottom part of the container body is excessive. May be heated to.

The present invention has been made in view of the above problems, and it is an object of the present invention to provide a container for induction heating cooking which suppresses damage to the container due to emptying and has higher safety than conventional containers. To do.

[0005]

The present invention has been made to solve the above problems, and an induction heating cooking container according to the present invention comprises a bottomed cylindrical container body made of a non-conductive material. In an induction heating cooking container provided with a heating element that generates heat by electromagnetic induction, the heating element is provided inside the container body, and the heating element is normally retracted to a retracted position,
It is characterized in that the container main body is provided with a heating element retracting means for moving the heating element to a cooking position having a larger calorific value than the retracting position when a liquid such as water is put into the container main body. For liquids such as water, in addition to water itself, for example,
Includes coffee, juice, milk and other beverages and soups.

Particularly, it is preferable that the contact area between the heating element and the container body at the retracted position is smaller than that at the cooking position. The contact area at the retracted position is 0, that is, the non-contact state is included.

Further, the heating element retracting means is interposed between the heating element and the container body, and normally causes the heating element to retract to a retracted position above the cooking position so that liquid such as water is stored in the container body. When inserted, it is preferable that the heating element retracting means changes its properties and moves the heating element to the lower cooking position by its own weight.

In particular, it is preferable that the heating element retreat means is a water-soluble solid substance.

The induction heating cooking container according to the present invention is an induction heating cooking container comprising a bottomed cylindrical container body made of a non-conductive material and a heating element for generating heat by electromagnetic induction. The body is provided inside the container body,
It is characterized in that a heating element moving means for moving the heating element in a direction in which the amount of generated heat decreases when the heating element reaches a predetermined temperature or higher is provided in the container body.

In particular, it is preferable that the heating element moving means is a shape memory element that changes its shape when the temperature exceeds the predetermined temperature and moves the heating element in a direction in which the amount of heat generation decreases.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of an induction heating cooking container according to the present invention will be described with reference to FIGS. 1 and 2, and a bottomed cylindrical container body 1 having an upper opening and heat generation by electromagnetic induction. An induction heating cooking container including the heating element 2 will be described.

The container body 1 has a body portion 3 that expands upward in a substantially tapered shape, a substantially flat plate-like bottom portion 4 integrally formed with the body portion 3, and a body portion 3 of the body portion 3. The upper end portion is provided with a flange portion 5 formed over the entire circumference. Vertical ribs 6 are formed radially on the outer peripheral surface of the body portion 3, and the flange portion 5 is formed in a substantially U shape in cross section. Also,
The body 3 is formed such that the upper body 3a and the lower body 3b are continuous in a stepwise manner via a horizontal annular connecting portion 7, and an auxiliary piece 8 is provided at the lower end of the upper body 3a. 3b is extended downward so as to have a predetermined gap. Further, an annular locking projection 9 is formed on the inner peripheral surface of the lower body portion 3b at a predetermined height above the bottom portion 4, and the lower body portion 3b has a diameter extending from the locking projection 9 to the bottom portion 4. It is formed to be substantially constant. The inner surface 4a of the bottom portion 4 is provided with a plurality of recesses 10 such as grooves. The locking projection 9
The (projection) does not have to be annular. Further, the locking projection 9 is a restricting means for restricting the movement of the heating element 2 beyond a predetermined height, and the heating element 2 can move upward until the upper surface 2a thereof comes into contact with the locking projection 9. And the locking projection 9
Therefore, the heating element 2 cannot be easily removed from the container body 1. However, if the locking projection 9 (including a non-annular shape) is provided as the restricting means, the heating element 2 is forcibly pulled upward by hand to destroy the locking projection 9, and the heating element 2 is held. 1
It is also possible to pull it out, which is convenient for separate disposal.

The container body 1 having the above structure is formed by injection molding from a thermoplastic resin, and examples of the thermoplastic resin include polypropylene, high density polyethylene, polyethylene terephthalate, polycarbonate,
Examples include polyamide and polystyrene. In particular, polypropylene resins such as propylene ethylene copolymer are light and have high mechanical strength, and are relatively inexpensive and have good moldability,
It is preferable because it has high heat resistance temperature and heat distortion temperature and excellent heat resistance. However, the material of the container body 1 is not limited to these, and non-conductive materials such as paper can be used in addition to synthetic resin. Especially, if it is formed from synthetic resin or paper, it is light and can be incinerated and discarded. Since it is relatively easy, it is preferable as a disposable container. As described later, the effect of the present invention is great in the case of a non-heat resistant material such as synthetic resin or paper. Further, a label such as a cylindrical shrink label may be attached to the outside of the body portion 3.

The heating element 2 is housed in the container body 1 so as to be vertically movable. The heating element 2 is made of a conductive material such as iron, stainless steel, chromium, aluminum,
It is made of a metal material such as copper or a non-metal material such as carbon. In particular, iron and stainless steel are preferable because they have high heat generation efficiency. The entire heating element 2 need not be a conductive material,
It suffices that at least a part is made of a conductive material.

In the present embodiment, the heating element 2 is formed in a plate shape having a substantially flat lower surface, specifically, a disk shape having a substantially constant thickness, and is disposed below the locking projection 9.
In a state before cooking, that is, at all times, as shown in FIG. 1, the container is placed on the bottom inner surface 4a (heating element mounting surface) of the container body 1 through a plurality of water-soluble solids 20 as heating element saving means. Has been done. That is, the solid material 20 is interposed between the bottom inner surface 4a of the container body 1 and the heating element 2, and the solid material 20 causes the heating element 2 to be always located at a position (a retracted position) above the bottom inner surface 4a by a predetermined distance. It is in a retracted state.

At this retracted position, the heating element 2 does not substantially generate heat, or even if it generates heat, the amount of heat generated is small, and other things, especially the container body 1, are not affected by the heat. In a general induction heating cooker today, the heating element 2 is placed on the container mounting surface P.
The amount of heat generated by the heating element 2 changes depending on the distance to the container mounting surface P, and when the distance from the container mounting surface P increases, the heating element 2 separates from the induction heating coil and the amount of heat generation also decreases.
When the heating element 2 is separated by a predetermined distance or more, the heating element 2 practically does not generate heat and cannot be cooked. The heating upper limit line which is the upper limit position differs depending on the induction heating cooker. For example, when the heating upper limit line is H1 shown in FIG. 1, the heating element 2 is located above the heating upper limit line H1 at the retracted position. Therefore, there is virtually no heat generation.
Some induction heating cookers are set so that the induction heating coil is not energized when the heating element 2 exceeds the heating upper limit line. In this case, the calorific value is zero. Further, in FIG. 1, the heating upper limit line is H2.
Even when the heating element 2 is located relatively lower than the heating upper limit line H2, the heat generated by the heating element 2 is large because the distance from the container mounting surface P is large and far from the heating induction coil. The quantity is small, so there is virtually no thermal effect on the container body 1.

The water-soluble solid matter 20 is soluble in water or a liquid such as coffee or soup, such as solid soup, solid seasoning, lump sugar, etc. Particularly, solid soup is easily dissolved in water. Preferred because it dissolves in.

Next, the use condition of the container having the above-mentioned structure will be described. First, in the normal state (before heating),
As described above, since the water-soluble solid matter 20 retracts and holds the heating element 2 in the retracted position, it is forgotten to put in a liquid such as water that should be put in for cooking, and placed on the container placement surface P of the cooker. Even if it does, the heating element 2 does not generate heat, or
Even if heat is generated, the amount of generated heat is small and the heat influence on the container body 1 is practically no problem. Therefore, the emptying can be prevented in advance, and there is no possibility that the container body 1 is excessively heated and damaged by the emptying, and high safety is secured. Further, in the present embodiment, the heating element 2 does not contact the container body 1 at the retracted position, or even if the heating element 2 makes contact, the peripheral edge portion of the heating element 2 only slightly contacts the inner peripheral surface of the body portion of the container body 1. Therefore, even when heat is generated, there is substantially no effect on the container body 1. In particular, since the heating element 2 is separated from the bottom inner surface 4a of the container body 1 which is the most likely to be damaged by heat in the related art by the height of the solid matter 20, the damage to the bottom 4 can be ensured in advance. Can be prevented.

The contact area between the heating element 2 and the container body 1 may be the same between the retracted position and the cooking position, but the contact area at the retracted position is the same as the configuration shown in FIG. If the amount of heat is reduced more than that, the heat damage of the container body 1 can be more reliably prevented by the synergistic effect of the decrease in the amount of heat generation and the decrease in the contact area.

On the other hand, for example, when water V is put into the container body 1 during cooking as shown in FIG. 2, the solid matter 20 is melted by the water V and loses its shape, and the heating element 2 moves downward due to its own weight. Then, the bottom inner surface 4a of the container body 1
The lower surface 2b thereof abuts. The position where the heating element 2 is placed in contact with the bottom inner surface 4a of the container body 1 in this manner is the cooking position. At the cooking position, the heating element 2 is located at the lowest position in the container body 1 and its heat generation. The maximum amount is the maximum, and it can be cooked by setting the container in the cooker.

Since the solid matter 20 is melted and disappears by the liquid put in during cooking as described above, the solid matter 20 does not interfere during or after cooking. Suitable, if it is solid soup, you can make hot soup by adding water,
If it is a solid seasoning, various soups can be seasoned.

In this embodiment, the bottom inner surface 4a of the container body 1 is used as the heating element mounting surface, and the heating element 2 is placed at the cooking position.
Although it is configured to be mounted on the bottom inner surface 4a, the heating element mounting surface may be provided at a position above the bottom inner surface 4a by a predetermined height. For example, as shown in FIG. 3, an annular support surface 30 may be formed as a heating element mounting surface on the inner peripheral surface of the body. When no liquid such as water is put in, the annular water-soluble solid material 21 is placed on the annular support surface 30 and the heating element 2 is placed thereon, as shown in FIG. That is, the heating element 2 may be retracted to the upper retracted position by interposing the water-soluble solid substance 21 between the annular support surface 30 and the heating element 2. And when cooking, the container body 1
If you put a liquid such as water into the
1 melts and the peripheral edge of the heating element 2 contacts the annular support surface 30 and becomes the cooking position. In this configuration, the flange portion 2c protruding laterally is formed on the peripheral edge of the heating element 2, and the lower surface of the flange portion 2c abuts the upper surface of the solid material 20 at the retracted position, and at the cooking position. It abuts on the annular support surface 30. Although the lower surface 2b of the heating element 2 is not in contact with the bottom inner surface 4a of the container body 1 at the cooking position as shown in FIG. 3B, it may be in contact therewith. The annular support surface 30
May be projected on the inner surface 4a of the bottom portion instead of the inner peripheral surface of the body portion.

Incidentally, as shown in FIG. 3, for example, a so-called instant food product in which a dried food W such as dried noodles is contained in the container body 1 and the upper opening of the container body 1 is releasably sealed with a seal lid 40. It can also be used as a container. When eating the stored dry food W, as shown by the two-dot chain line in FIG. 3 (a), the seal lid 40 is partially peeled, water is poured from the opening, and the dried lid is placed on the induction heating cooker. The heat of the heating element 2 heats the water. Therefore, it is not necessary to prepare hot water in advance, and cooking is easy.

Further, in the above-mentioned embodiment, the case where the water-soluble solids 20 and 21 are interposed as the heating element retracting means has been described, but such a water-soluble solid substance whose properties are changed by a liquid such as water is used. In addition to the one that dissolves in water etc., it may be one whose shape changes by a liquid such as water. For example, as shown in FIG. 4A, in order to separate the heating element 2 from the bottom inner surface 4a serving as the heating element mounting surface, a thin plate-shaped separating member 40 formed in an upward convex shape is provided on the bottom inner surface 4a and the heating element 2. It may be interposed between and. The separating member 50 maintains the convex shape on the upper side in a dry state and holds the heating element 2 at the retracted position separated from the inner surface 4a of the bottom portion. Then, when a liquid such as water is put therein, it softens and deforms into a flat plate shape as shown in FIG. As described above, the heating element 2 is in the retracted position by the upwardly projecting thin plate-shaped separating member 50 until the liquid such as water is put therein, and therefore, the emptying is prevented in advance and the safety is ensured. When a liquid such as the above is put in, the shape of the separating member 50 is changed, and the heat generating element 2 is in the cooking position by its own weight as shown in FIG. In addition to this, there are various modes of changing the properties. In any case, if the heating element retracting means moves the heating element 2 downward by its own weight, the structure for moving it is provided. It is extremely simple and preferable. The downward movement of the heating element 2 is not limited to the parallel movement in the vertical direction, and may be rotation with a predetermined position as a rotation fulcrum.

Further, in any of the above embodiments, the heating element evacuation means is provided so that the heating element 2 does not generate heat unless a liquid such as water is put into the container body 1, or heat is generated only to such an extent that there is practically no problem. Thus, the emptying itself is prevented to prevent damage to the container body 1 due to heat. However, as described below, the heating element moving means is provided in the container body 1 to temporarily empty the empty space. Even if the above is performed, it is possible to prevent damage to the container body 1 due to heat by limiting the temperature rise of the heating element 2 to a predetermined temperature or less.

For example, as shown in FIG. 5, the flat plate-shaped heating element 2 provided in the container body 1 so as to be movable up and down has a bottom inner surface as shown by a chain double-dashed line in FIG. 4a, and when it reaches a predetermined temperature or higher, the state shown in FIG.
As indicated by the solid line in (a), the upper surface moves a predetermined height above the bottom inner surface 4a. The heating element 2 has a leg portion 6 as a shape memory body that is deformed so as to project downward when the temperature exceeds a predetermined temperature.
A plurality of 0s are provided. Specifically, as shown in FIG. 5B, a total of four are provided at predetermined angles along the circumferential direction.

If the container having the above structure is emptied, it is as shown in FIG.
At the position indicated by the two-dot chain line in (a), the heating element 2 gradually generates heat and its temperature rises, and the cooking temperature (for example, 1
20 ° C.) or higher, the leg portions 60 start to bend downward from the flat state, which is the reference state, as shown in FIG.
As indicated by the solid line in (a), the leg portion 60 is deformed into a shape extending downward as a whole. Due to the change in the shape of the leg portion 60, the heating element 2 floats above the inner surface 4a of the bottom portion for a predetermined distance.
Therefore, the distance from the heating induction coil becomes large, and the calorific value is reduced to zero, or the calorific value is reduced to such an extent that there is substantially no problem. Moreover, since only the tips 60a of the legs 60 make point contact with the bottom inner surface 4a when the heating element 2 is in a floating state, even if the legs 60 themselves generate heat by electromagnetic induction, the heat effect on the bottom inner surface 4a will occur. Can be greatly suppressed as compared with the related art.

In addition to the structure in which the heating element 2 has a shape memory element as shown in FIG. 5, a spring 70 as a shape memory element is interposed between the heating element 2 and the bottom inner surface 4a as shown in FIG. You may. Like the leg portion 60, the spring 70 also expands when the temperature rises above a predetermined temperature to elevate the heating element 2 from the cooking position shown by the chain double-dashed line in FIG. 6 to reduce the amount of heat generation. The damage of 1 can be prevented.

Incidentally, the leg portion 60 and the spring 7 as the shape memory body.
For example, 0 can have a bimetal structure or can be formed from a shape memory alloy or the like. Whatever it is,
When the heating element 2 reaches a predetermined temperature or higher, the heating element 2 is raised to reduce the amount of heat generation thereof, so that damage to the container body 1 due to emptying can be suppressed as compared with the conventional case. It should be noted that various other configurations can be adopted as the heating element moving means, but a shape memory element is preferable because the configuration is simple.

Further, in the above description, it is assumed that the induction heating cooker has a structure in which the container is placed on the container mounting surface P and heated, and therefore the amount of heat generated is reduced by moving the heating element 2 upward. However, the direction in which the amount of heat generated decreases depends on the configuration of the induction heating cooker, and in any case, the direction in which the induction heating coil of the cooker approaches is the direction in which the amount of heat generated increases, and conversely The direction of moving away from the heating coil is the direction of decreasing the amount of heat generation.

The shapes of the heating element 2 and the container body 1 can be changed as appropriate. For example, the container body 1 may have a rectangular tube shape such as a quadrangle or a hexagon other than the cylindrical shape.

[0032]

As described above, by providing the heating element retracting means for retracting the heating element to the retracted position until the container body is filled with the liquid such as water, the liquid such as water enters the container body. It is possible to prevent the emptying that is performed without being performed, prevent damage to the container body due to heat, and improve the safety thereof as compared with the conventional one.

Further, by providing the heating element moving means for limiting the temperature rise of the heating element to a predetermined temperature or less, it is possible to prevent an excessive temperature rise of the heating element even if emptying is performed, and the container main body Damage due to heat is suppressed, and the safety thereof can be improved as compared with the conventional one.

[Brief description of drawings]

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

FIG. 2 is a sectional view showing a usage state of the container.

FIG. 3 is a cross-sectional view showing an induction heating cooking container of another embodiment, (a) showing a state before cooking and (b) showing a state during cooking.

FIG. 4 is a cross-sectional view showing an induction heating cooking container of another embodiment, (a) showing a state before cooking and (b) showing a state during cooking.

FIG. 5A is a cross-sectional view showing a container for induction heating cooking according to another embodiment, and FIG. 5B is a plan view of a heating element used in the container.

FIG. 6 is a sectional view showing an induction heating cooking container according to another embodiment.

[Explanation of symbols]

1 ... Container body, 2 ... Heating element, 2a ... Upper surface, 2b ... Lower surface,
2c ... collar part, 3 ... trunk part, 4 ... bottom part, 4a ... bottom part inner surface, 6
... ribs, 9 ... locking projections (regulating means), 10 ... recesses, 2
0, 21 ... Solid matter, 30 ... Supporting surface, 40 ... Seal lid (lid), 50 ... Separation member, 60 ... Leg (shape memory), 7
0 ... Spring (shape memory), H1, H2 ... Heating upper limit line, P ... Container mounting surface, V ... Water (liquid), W ... Dry food (content)

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Ikuo Sakashita             5-3-18 Imazukita, Tsurumi-ku, Osaka             Company Fuji Seal F term (reference) 3K051 AB04 AC33 AD10 AD39 BD23                       CD43 CD44                 4B055 AA50 BA02 BA12 CA02 CC70                       DA02 DB14 FA03 FC20

Claims (6)

[Claims] 1. A container for induction heating cooking, comprising: a bottomed cylindrical container body (1) made of a non-conductive material; and a heating element (2) that generates heat by electromagnetic induction, wherein the heating element (2) is The heating element (2) is provided inside the container body (1), and the heating element (2) is normally retracted to the retracted position, and when the container body (1) is filled with a liquid such as water, the heating element (2).
A container for induction heating cooking, characterized in that a heating element retracting means for moving the heating element to a cooking position where the calorific value is larger than the retracting position is provided in the container body (1). 2. The container for induction heating cooking according to claim 1, wherein a contact area between the heating element (2) and the container body (1) in the retracted position is smaller than that in the cooking position. 3. The heating element retracting means is interposed between the heating element (2) and the container body (1) to normally retract the heating element (2) to a retracting position above a cooking position, The induction according to claim 1 or 2, wherein when a liquid such as water is put into the container body (1), the heating element retracting means changes its properties and moves the heating element (2) to the lower cooking position by its own weight. Cooking container. 4. The heating element retracting means is a water-soluble solid (2
The container for induction heating cooking according to claim 3 which is 0, 21). 5. A container for induction heating, comprising a bottomed cylindrical container body (1) made of a non-conductive material and a heating element (2) that generates heat by electromagnetic induction, wherein the heating element (2) is Inside the container body (1), there is a heating element moving means provided in the container body (1) for moving the heating element (2) in a direction in which the amount of heat generation decreases when the heating element (2) reaches a predetermined temperature or higher. A container for induction heating cooking, characterized in that it is provided in. 6. The heating element moving means is a shape memory element (60, 70) that changes its shape when the temperature exceeds the predetermined temperature and moves the heating element (2) in a direction in which the amount of heat generation decreases. The container for induction heating according to 5.