JP2003125928A - Electromagnetic cooker vessel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic cooker vessel which is heated with Joule heat from eddy current generated by the alternate magnetic field of a heating coil of the electromagnetic cooker, and can change the heat mode according to the food ingredients and increase heat efficiency. SOLUTION: A heating plate 3 which generates eddy current is detachably attached inside of a vessel body 2 made of nonmetallic substance. When the heating plate 3 is changed to a material of other heating characteristics, the heating mode can be changed adequately to the food ingredient, and, it makes less heat diffuse outward as the heating plate 3 is attached inside of the vessel body 2 made of nonmetal material, and it increases heat efficiency.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic cooker that heats and cooks foodstuffs by induction heating, and more particularly to a cooking container used in the electromagnetic cooker.

[0002]

2. Description of the Related Art Cooking containers such as pots, kettles and hot plates (hereinafter simply referred to as "containers") used in electromagnetic cookers receive an alternating magnetic field from a heating coil of the electromagnetic cooker to generate an eddy current, The Joule heat heats the foodstuffs inside, but as this container, conventionally iron,
Iron enamel, stainless steel, and other materials made of a single iron-based material are used. In addition, a magnetic metal material having a predetermined Curie temperature is joined to the outer surface of a container made of a non-magnetic metal material, an eddy current is applied to the magnetic metal material at a temperature below the Curie temperature, and an eddy current flows to the non-magnetic metal material at a temperature above the Curie temperature. A container in which an electric current is passed to have a self-temperature control function has also been proposed (see Japanese Patent No. 3079573).

[0003]

In such a conventional container, the container itself or the bonding material on the outer surface of the container generates an eddy current to generate heat. Therefore, the conventional container has a problem that the heating mode at the time of induction heating is fixed and it is difficult to obtain appropriate heating according to the food material. Further, the conventional container has a problem that heat is easily released because the heat generating portion is exposed to the outside and the heat efficiency is poor. Then, the subject of this invention is to obtain the cooking container for electromagnetic cookers which can change a heating mode easily according to foodstuffs and has high thermal efficiency.

[0004]

SUMMARY OF THE INVENTION In order to solve the above problems, according to the present invention, a heating plate is detachably attached to the inside of a container body made of a non-metallic material, and the heating plate is induction-heated. The food in the container body is cooked by heating (Claim 1). That is,
According to the present invention, a heating plate that receives an alternating magnetic field from a heating coil of an electromagnetic cooker to generate an eddy current is detachably mounted in a container body made of a non-metallic material. By replacing the heating plate having the heating mode, it is possible to freely realize appropriate heating according to the food material. Further, since the heating plate is mounted inside the container body made of a non-metallic material, heat is not released to the outside and high thermal efficiency can be obtained.

In claim 1, the heating plate is formed in a disk shape and is attached to the bottom of the container body (claim 2) or is formed in a cylindrical shape and is attached along the side wall of the container body. It is possible (Claim 3).

In the second and third aspects, it is preferable that the heating plate be provided with a hole for adjusting a flow path of the eddy current (claim 4). As a result, the heating mode can be variously changed by heating mainly the central portion of the heating plate or heating the peripheral portion.

In claim 2, the disk-shaped heating plate can be curved in a convex shape or a concave shape (claim 5), whereby the food material in the container is slid on the heating plate to the peripheral portion. It can be moved closer (convex plate) or closer to the center (concave plate).

Further, in claim 2, the disc-shaped heating plate can be mounted by being floated from the bottom of the container body (claim 6). As a result, food waste such as tempura meal and bread crumbs can be collected in the gap between the heating plate and the bottom of the container, and the bottom of the container is not heated, so that the food waste does not burn. Further, by providing a gap between the heating plate and the bottom of the container, it is possible to improve the convection of liquid such as tempura oil or soup.
This convection is useful for heating frying oil and heating soup.

In claim 5 or 6, a hole is provided in the heating plate for dropping food waste to the bottom of the container (claim 7), or a hole is provided for convection of liquid (claim). Item 8), since the food waste can be dropped from the hole to the bottom of the container and the tempura oil or the like can be passed through the hole, the above-mentioned collection of the food waste and the convection action of the tempura oil and the like are further improved.

In claim 3, the container body and the heating plate can be formed in a bosh shape (claim 9). The morning glory-shaped heating plate prevents food from burning easily, and the slanted side walls can be slid to collect food waste on the bottom of the container.

In claim 1, the non-metal material forming the container body may be made of an inorganic material, a heat-resistant resin material, wood or paper (claim 1).
0).

Further, in claim 1, the heating plate may be made of a single ferrous material, and may be made of a non-magnetic metal and a magnetic shunt alloy bonded to the lower surface of the non-magnetic metal. There is (claim 11). In that case, the heating plate can be provided with a self-temperature control function, and by setting the Curie temperature of the magnetic shunt alloy to various values, heating plates having various target temperatures can be obtained.

In the eleventh aspect, the thickness of the magnetic shunt alloy is preferably set to be equal to or less than the penetration depth of the eddy current at the Curie temperature or less (claim 12). As a result, the eddy current penetrates into the non-magnetic metal even below the Curie temperature, so that the steep change in the magnetic permeability around the Curie temperature is alleviated.

In the eleventh aspect of the present invention, if the magnetic permeability of the magnetic shunt alloy is changed smoothly with respect to temperature change, it is heated at an arbitrary target temperature in combination with the temperature control function of the electromagnetic cooker. Controllable (Claim 1
3).

[0015]

1 is a longitudinal sectional view of a container showing a first embodiment of the present invention. In FIG. 1, a container 1 is, for example, for deep-fried food such as tempura and fries, and has a disk-shaped heating plate 3 at the bottom of a container body 2 made of an inorganic material such as stone, ceramics, ceramics or a non-metal material such as a heat-resistant resin material. Is installed and configured. The heating plate 3 is detachably mounted on a stand 4 that is in contact with several places around the periphery thereof and floats up from the bottom of the container body 2, and a gap 5 is provided between the heating plate 3 and the bottom of the container body 2. ing. The container 1 is placed on a top plate (not shown) of a known electromagnetic cooker, and the heating plate 3 is located above the spiral heating coil 6. When a high-frequency current is passed through the heating coil 6, an eddy current is induced in the heating plate 3 by the alternating magnetic field interlinking through the container body 1 and heat is generated by the Joule heat. As a result, cooking oil 7 such as tempura oil filled in the container 1 is heated by heat transfer from the heating plate 3.

FIG. 2 is a plan view of the heating plate 3 in FIG. 1, and FIG. 3 is a vertical sectional view thereof. In FIG. 3, the heating plate 3 is made of a bonding material in which a magnetic shunt alloy 3b is firmly bonded to the lower surface of a non-magnetic metal 3a such as copper or aluminum by means such as pressure welding. Here, magnetic shunt alloy 3
As is well known, b has a characteristic that the magnetic permeability changes depending on the temperature, and is an alloy containing iron, nickel, chromium, cobalt and the like. Depending on the type and mixing ratio of these component metals, it is possible to obtain characteristics that the magnetic permeability is sharply decreased before and after a specific Curie temperature (target temperature), or the magnetic permeability is decreased substantially in proportion to the temperature increase. . By the way, when the magnetic permeability decreases, the penetration depth of the eddy current increases, the resistance substantially decreases, and the heat generation of the heating plate 3 decreases. Further, as shown in FIG. 3, the heating plate 3 is
It is curved in a convex shape.

On the other hand, in FIG. 2, the heating plate 3 is provided with holes 8 and 9 for adjusting the flow path of the eddy current. The circle indicated by the alternate long and short dash line indicates the outer shape position (heating range) of the heating coil 6. As shown,
The holes 8 are circular and are located at the center of the heating plate 3, and the holes 9 are rectangular and are arranged at four radial positions. Further, the heating plate 3 is provided with holes 10 and 11 at four positions for dropping food waste to the bottom of the container 1. As shown, the holes 10 and 11 are both arcuate in shape, and the holes 10 are arranged between adjacent holes 9 along the envelope circle thereof.
Are arranged so as to extend along the adjacent holes 10 and follow the outline of the heating coil 6.

The arrows in FIG. 2 conceptually show the flow of eddy currents generated in the heating plate 3. Originally, the eddy currents tend to be uniformly distributed in a concentric circle, but in the heating plate 3 of FIG. 2, the passages of the eddy currents are adjusted as a result of the interruption of the electric path mainly due to the existence of the holes 8 and 9. In the present case, the eddy current is concentrated and flows on the central portion of the heating plate 3 outside the hole 8 as shown by the arrow. That is, by processing the holes 8 and 9, it is possible to concentrate the eddy current in a portion that requires heating and obtain a desired heating mode. FIG. 4 shows the temperature distribution of the heating plate 3 of FIG. 2, where the horizontal axis represents the radial position and the vertical axis represents the temperature. As shown in the figure, the central portion where the eddy current is concentrated has a higher temperature than the peripheral portion.

In the container 1 having the heating plate 3 having a high temperature in the central portion, the cooking oil 7 convects from the central portion of the container 1 toward the peripheral portion, as shown by the arrow in FIG. This convection is
The cooking oil 7 is promoted by passing through the holes 8 to 11 and the gap 5. On the other hand, food waste 12 such as tempura meal (Fig. 1)
Passes through the holes 8 to 11 in FIG. 2 and falls to the bottom of the container 1 and stays in the gap 5. In particular, since the heating plate 3 in FIG. 2 is curved in a convex shape, the food waste 12 easily slides on the upper surface of the food waste 12 and gathers in the peripheral portion, and falls more through the holes 10 and 11. Since the container body 2 is a non-metallic material, it is not induction-heated, and the heating plate 3 is lifted from the bottom of the container body 2, so that the bottom of the container body 2 is at a relatively low temperature, and therefore food wastes accumulated here 12 does not burn.

5 to 6 show a second embodiment of the present invention, and each drawing corresponds to FIGS. 1 to 4 of the first embodiment, respectively. This embodiment is different from the first embodiment in that the heating plate 3 is concavely curved as shown in FIGS. 5 and 7, and the shape and arrangement of the holes of the heating plate 3, The heating mode is different. 6, a large circular hole 13 is formed in the center of the heating plate 3 as compared with FIG. 2, and four rectangular holes 14 are radially formed from the hole 13. Further, on the peripheral side of the heating plate 3, four rectangular holes 15 are radially formed between the adjacent holes 14, and further, on the outer side thereof, three rectangular holes 15 are formed between the adjacent holes 15.
A circular hole 16 is formed at a position along the outline of the heating coil 6.

In FIG. 6, the flow path of the eddy current is adjusted by the holes 14 to 16. In this case, as shown by the arrow,
It flows concentratedly around the heating plate 3. As a result, as shown in FIG. 8, the temperature of the heating plate 3 is higher in the peripheral portion than in the central portion. Then, as shown by the arrow in FIG. 5, the cooking oil 7 in the container 1 convects from the peripheral portion toward the central portion. In this convection, the cooking oil 7 has holes 14
Is promoted by passing through .about.16 and the gap 5. Further, the food waste 12 falls through the holes 14 to 16 to the bottom of the container 1 and stays in the gap 5. In particular, since the heating plate 3 of FIG. 2 is curved in a concave shape, the food waste 12 slides on the upper surface of the food waste 12 and gathers in the central portion, and falls more through the hole 14.

FIG. 9 is a perspective view showing a third embodiment of the present invention. The container 1 shown in FIG. 9 is for cooking and is basically a flat heating plate 3 having a hole 17 in the center and is directly and detachably placed on the bottom of the container body 2. The container body 2 is made of a non-metallic material of the type described above, and the heating coil 3 is also made of a joining material of a non-magnetic metal 3a and a magnetic shunt alloy 3b. The heating plate 3 generates heat uniformly over the entire surface, and liquid such as soup rises as shown by the arrow.
Convection.

FIG. 10 shows a fourth embodiment of the present invention. In the container 1 of FIG. 10, the heating plate 3 shown in FIG. 9 is placed on a stand 4 and floated from the bottom of the container body 2. It is a thing. In this embodiment, since soup and the like convect through the gap 5 at the bottom, there is an advantage that the soup and the like do not remain around the heating plate 3 and are not burnt.

11 and 12 show a fifth embodiment of the present invention. FIG. 11 is a vertical sectional view of a container, and FIG.
FIG. 12 is a development view of the heating plate in FIG. 11. Figure 11
In Fig. 12, the container body 2 made of a non-metal material is formed in a bosh shape, and the heating plate 3 made of a bonding material of the non-magnetic metal 3a and the magnetic shunt alloy 3b is formed by rolling a plate material having a shape shown in Fig. 12, It is formed in a morning glory shape having a slightly larger taper than the main body 2. As shown, the heating plate 3 is removably stacked so as to float from the side wall and bottom of the container body 2. On the outer peripheral side of the heating plate 3, a hole 1 consisting of small holes
There are many 8s in 2 rows. The heating coil 6 is also formed in a bosh shape along the side surface of the container body 2. When the container 1 is used in, for example, a fryer, the cooking oil 7 convects through the gap 5 and the hole 18 as shown by the arrow. The food waste 12, such as tempura meal, slides down the inner surface of the heating plate 3 and stays at the bottom of the container 1. In this case also, since the bottom of the container 1 is not heated, the food waste 12 does not burn.

13 and 14 show an embodiment in which the idea of the present invention is applied to a hot plate for grilling meat, etc., although not a cooking container. FIG. 13 is a plan view of the hot plate, and FIG. 14 is a longitudinal section thereof. It is a side view. 13 and 1
4, the heating plate 3 curved in a convex shape is detachably mounted on the oil receiving tray 19 via the stand 4.
As shown in FIG. 13, the heating plate 3 has an anchor-shaped hole 2
There are 0s in 4 places. The heating coil 6 has a spiral shape, and its peripheral edge 6 a is wound in a cylindrical shape along the heating plate 3. The flow path of the eddy current indicated by the arrow in FIG. 13 is adjusted by the hole 20, and the eddy current flows concentratedly in the central portion of the heating plate 3 as shown in the drawing, and that portion becomes high in temperature. Therefore, if the food 21 such as meat is placed on the central portion of the heating plate 3, the food 2 is efficiently baked and baked.
1 can be moved to a relatively low temperature peripheral portion and kept warm. Further, meat juice or the like exuded from the food material 21 flows down on the convex surface of the heating plate 3 and drops on the oil pan 19.

In each of the above embodiments, the heating plate 3 is detachably mounted in the container body 2 made of a non-metallic material, so that the heating plate 3 can be replaced to obtain various heating modes in the same container 1. Therefore, it is possible to easily realize an appropriate heating mode according to the food material.
Further, since the heating plate 3 is attached to the inside of the container body 2 made of a non-metallic material, heat is not released to the outside and high thermal efficiency can be obtained.

In this case, the heating mode is the heating plate 3
It can be changed by making holes 8-11, 13-16, etc. in the hole and adjusting the flow path of the eddy current, and it is possible to heat the central part of the heating plate 3 and the peripheral part. Is. These holes 8-11, 13-1
6 and the like are also useful for convection of liquid such as tempura oil soup and dropping food waste 12 such as tempura meal on the bottom of the container 1. Also, a disk-shaped heating plate 3
Curved into a convex shape (Fig. 3) or a concave shape (Fig. 7),
The food material can be slid to the peripheral portion or the central portion of the heating plate 3 to improve the usability.

If the disc-shaped heating plate 3 is mounted so as to be floated from the bottom of the container body 1, a gap 5 is formed between the disc-shaped heating plate 3 and the bottom of the container.
The food waste 12 can be stored in the container, and since the bottom of the container is not heated, the food waste 12 does not burn. At the same time, the gap 5 also improves the convection of the tempura oil and the like.

On the other hand, if the heating plate 3 is made of a joining material of the non-magnetic metal 3a and the degaussing alloy 3b, the heating plate can have a self-temperature control function, and the target temperature is the Curie of the degaussing alloy 3b. It can be variously changed by setting the temperature. Further, if the thickness of the magnetic shunt alloy 3b is set to be equal to or less than the penetration depth of the eddy current at the Curie temperature or lower, the change in the amount of heat generation before and after the Curie temperature can be moderated.
Further, if the magnetic permeability of the magnetic shunt alloy 3b is changed smoothly with respect to the temperature change, it becomes possible to heat at an arbitrary target temperature in combination with the temperature control function of the electromagnetic cooker side (Japanese Patent Laid-Open No. 2001-2001). -155846 gazette).

In the illustrated embodiment, the heating plate 3 is made of the joining material of the non-magnetic metal 3a and the magnetic shunt alloy 3b. However, it is of course possible to use a single material such as an iron plate. It is possible. Further, the curved shape and the hole shape of the heating plate 3 are not limited to the illustrated examples, and any means for giving various heating modes to the heating plate 3 is arbitrary.

[0031]

As described above, according to the present invention, the heating plate is detachably attached to the inside of the main body of the non-metallic material, so that the heating plate can be replaced to obtain various heating modes according to the food. In addition, since the heating plate is immersed in the food material, heat dissipation is suppressed and high heat efficiency is obtained, and it is possible to improve cooking quality and save energy in the electromagnetic cooker at the same time.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a cooking container showing a first embodiment of the present invention.

2 is a plan view of the heating plate in FIG. 1. FIG.

FIG. 3 is a vertical cross-sectional view of FIG.

FIG. 4 is a diagram showing a temperature distribution of the heating plate of FIG.

FIG. 5 is a vertical sectional view of a cooking container according to a second embodiment of the present invention.

FIG. 6 is a plan view of the heating plate in FIG.

7 is a vertical cross-sectional view of FIG.

8 is a diagram showing a temperature distribution of the heating plate of FIG.

FIG. 9 is a perspective view of a cooking container according to a third embodiment of the present invention.

FIG. 10 is a perspective view of a cooking container showing a fourth embodiment of the present invention.

FIG. 11 is a vertical cross-sectional view of a cooking container showing the fifth embodiment of the present invention.

FIG. 12 is a development view of the heating plate in FIG.

FIG. 13 is a plan view of a hot plate showing an application example of the present invention.

14 is a vertical cross-sectional view of FIG.

[Explanation of symbols]

1 cooking container 2 container body 3 heating plate 3a Non-magnetic material 3b Magnetic shunt alloy 6 heating coil 8-11 holes 13-18 holes

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Claims (13)

[Claims] 1. A heating plate is detachably attached to the inside of a container body made of a non-metallic material, and the food in the container body is cooked by inductively heating the heating plate. Cooking container for electromagnetic cooker. 2. The cooking container for an electromagnetic cooker according to claim 1, wherein the heating plate is formed in a disk shape, and the heating plate is attached to a bottom portion of the container body. 3. The cooking container for an electromagnetic cooker according to claim 1, wherein the heating plate is formed in a cylindrical shape, and the heating plate is attached along a side wall of the container body. 4. The cooking container for an electromagnetic cooker according to claim 2, wherein the heating plate has a hole for adjusting a flow path of an eddy current. 5. The electromagnetic cooker cooking container according to claim 2, wherein the heating plate is curved. 6. The cooking container for an electromagnetic cooker according to claim 2, wherein the heating plate is mounted so as to float from the bottom of the container body. 7. The cooking container for an electromagnetic cooker according to claim 5, wherein the heating plate is provided with a hole for dropping food waste to the bottom of the container. 8. The cooking container for an electromagnetic cooker according to claim 5, wherein the heating plate is provided with a hole for convection of liquid. 9. The cooking container for an electromagnetic cooker according to claim 3, wherein the container body and the heating plate are formed in a morning glory shape. 10. The non-metallic material comprises an inorganic material, a heat resistant resin material, wood or paper.
The cooking container for the electromagnetic cooker described. 11. The cooking container for an electromagnetic cooker according to claim 1, wherein the heating plate is made of a non-magnetic metal and a magnetic shunt alloy bonded to a lower surface of the non-magnetic metal. 12. The cooking container for an electromagnetic cooker according to claim 11, wherein the thickness of the magnetic shunt alloy is set to be equal to or less than the penetration depth of eddy current at the Curie temperature or lower. 13. The cooking container for an electromagnetic cooker according to claim 11, wherein the magnetic permeability of the magnetic shunt alloy is changed smoothly with respect to temperature change.