JPH10241849A - Inductive heating type cooking utensil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently perform inductive heating and ensure lighter weight, easy handling, and reduction of a material cost by circularly providing a magnetic metal as a position opposite to a heating coil of an outer face of a cooking pot. SOLUTION: A cooking pot comprises a heating coil 8 connected to a high-frequency inverter 7, a first metal layer 10 with good heat conductivity, and a second metal layer 11 thermally sprayed at a position opposite to the heating coil 8 of the outer face of the metal layer 10, being magnetic, and serving as a heating element. A high-frequency magnetic field is generated from a heating coil by a high-frequency current supplied from the high-frequency inverter 7, and the metal layer 11 thermally sprayed to the cooking pot 9 is heated for an eddy current due to electromagnetic induction, and a material to be heated is heated. Since a power density is extremely large at a position opposite to the heating coil 8, sufficient heating quantity can be obtained merely by the metal layer 11. Since the metal layer 11 is thermally sprayed at a position opposite to the heating coil 8, the cooking pot 9 is lightly weighted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction heating cooker used in ordinary households.

[0002]

2. Description of the Related Art In an induction heating type cooker, a high frequency magnetic field is generated from a heating coil, and a cooking pot is heated by an eddy current caused by electromagnetic induction.

[0003] Hereinafter, a conventional induction heating cooker will be described.
This will be described with reference to FIG. In the figure, 1 is a high-frequency inverter, 2 is a heating coil connected to the high-frequency inverter 1, and 3 is a cooking pot.

[0004] The cooking pot 3 comprises a first metal layer 4 having good thermal conductivity, and a second metal layer 5 which is a magnetic material and serves as a heat source, which is sprayed on the outer surface of the first metal layer 4. It is composed of As shown in this configuration, a high-frequency magnetic field is generated from the heating coil 2 by the high-frequency current supplied by the high-frequency inverter 1, and the second metal layer 5 of the cooking pot 3 is caused by eddy current due to electromagnetic induction. Heated. The heat generated in the second metal layer 5 is transferred to the cooking pot 3
Of the cooking pot 3 is heated, and the object to be heated inside the cooking pot 3 is heated.

[0005]

In the above conventional structure, the second metal layer 5 covers the entire bottom of the outer surface of the cooking pot 3. However, the high-frequency magnetic field reaching the cooking pot 3 from the heating coil 2 has a distribution in the radial direction of the cooking pot 3, and as a result, in the cooking pot 3, the power density distribution 6 as shown in FIG. Has become. At this time, the power density becomes maximum at a position facing the heating coil 2.

Therefore, the heat generation amount is small in the portion of the second metal layer 5 not facing the heating coil 2. In addition, the weight of the cooking pot 3 is large due to the second metal layer 5, which is inconvenient for handling by a user. Further, the cost of the cooking pot 3 material also increases.

Accordingly, the present invention solves the above-mentioned conventional problems. By improving the configuration of a cooking pot, a cooking pot that efficiently performs induction heating, is lightweight, easy to handle, and reduces material costs is provided. It is an object of the present invention to provide an induction heating type cooking device provided with the heating device.

[0008]

In order to solve the above-mentioned problems, an induction heating type cooker according to the present invention is formed by spraying an annular magnetic metal on an outer surface of a cooking pot facing a heating coil.

[0009]

The invention according to claim 1 has a high-frequency inverter, a heating coil connected to the high-frequency inverter, and a cooking pot that is induction-heated by a high-frequency magnetic field generated from the heating coil, By providing the magnetic metal in an annular shape at the position facing the heating coil on the outer surface of the cooking pot, it is possible to spray the magnetic metal serving as a heat source to a limited portion, and efficiently perform induction heating, It is possible to provide an induction heating type cooker including a cooking pot that is lightweight, easy to handle, and reduces material costs.

According to the second aspect of the present invention, the thickness of the magnetic metal has a distribution in accordance with a predetermined power density distribution by the heating coil, so that the absorption of the high-frequency magnetic field by the magnetic metal can be further promoted. I can do it.

[0011]

【Example】

(Embodiment 1) An embodiment of the first means of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 7 denotes a high-frequency inverter, 8 denotes a heating coil connected to the high-frequency inverter 7, and 9 denotes a cooking pot.

The cooking pot 9 has a first metal layer 10 having good thermal conductivity, and a magnetic material that is thermally sprayed on the outer surface of the first metal layer 10 at a position facing the heating coil 8. And a second metal layer 11 serving as a source.

A high-frequency magnetic field is generated from the heating coil 8 by the high-frequency current supplied by the high-frequency inverter 7, and the cooking pot 9
The second metal layer 11 sprayed on is heated. The heat generated in the second metal layer 11 is applied to the first metal layer 1.
0 is conducted, and the object to be heated is heated. At this time, as can be seen from the power density distribution 6, since the power density is maximized at a position facing the heating coil 8, a sufficient amount of heat can be obtained only by the second metal layer 11. . Further, since the second metal layer 11 is sprayed on the portion facing the heating coil 8, the weight of the cooking pot 9 is reduced, and when the user handles the cooking pot 9 alone, , Very convenient. Further, the material cost of the cooking pot 9 can be reduced.

In the above description, an example of a cooking pot in an induction heating type cooker has been described. However, the present invention can be similarly applied to an induction heating type rice cooker and the like.

(Embodiment 2) Next, an embodiment of the second means of the present invention will be described with reference to the drawings. In FIG. 2, 12 is a high-frequency inverter, 13 is a heating coil connected to the high-frequency inverter 8, and 14 is a cooking pot.

The cooking pot 14 is made of a first material having good heat conductivity.
And a second metal layer 16 serving as a heat source by a magnetic material, which is sprayed at a position facing the heating coil 13 on the outer surface of the first metal layer 15, The second metal layer 16 has a sprayed thickness distribution in the radial direction of the cooking pot 14.

A high-frequency magnetic field is generated from the heating coil 13 by the high-frequency current supplied by the high-frequency inverter 12, and the second metal layer 16 sprayed on the cooking pan 14 due to eddy current due to electromagnetic induction is generated. Heated. The heat generated in the second metal layer 16 is conducted through the first metal layer 15, and the object to be heated is heated. that time,
As can be seen from the power density distribution 6, by increasing the thermal spray thickness at a position facing the heating coil 13 where the power density is maximum, in addition to the effect of the first embodiment, The metal layer 16 can more efficiently absorb the high-frequency magnetic field and obtain a sufficient amount of generated heat.

In the above description, an example of a cooking pot in an induction heating type cooker has been described. However, the present invention can be similarly applied to an induction heating type rice cooker and the like.

[0019]

As described above, according to the first aspect of the present invention, the induction heating is efficiently performed by providing the annular magnetic metal at the position facing the heating coil on the outer surface of the cooking pot, and the weight is reduced. It is possible to provide an induction heating type cooker provided with a cooking pot which is easy to handle and reduces material costs.

According to the second aspect of the present invention, when the magnetic metal is provided annularly on the outer surface of the cooking pot at a position facing the heating coil, the distribution of the thickness is adjusted according to a predetermined power density distribution. With this, induction heating can be performed more efficiently, and a sufficient amount of heat can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part of an induction heating cooker according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part of an induction heating cooker according to a second embodiment of the present invention.

FIG. 3 is a sectional view of a main part of a conventional induction heating type cooking device.

FIG. 4 is a power density distribution diagram of the induction heating type cooker.

[Explanation of symbols]

 1, 7, 12 High-frequency inverter 2, 8, 13 Heating coil 3, 9, 14 Cooking pot 4, 10, 15 First metal layer 5, 11, 16 Second metal layer 6 Power density distribution

Claims (3)

[Claims] 1. An induction heating type cooker comprising a cooking pot in which an annular magnetic metal is provided on an outer surface facing a heating coil. 2. The induction heating cooker according to claim 1, wherein the thickness of the magnetic metal is changed in accordance with the power density distribution by the heating coil. 3. The induction heating cooker according to claim 1, wherein the magnetic metal is applied by thermal spraying.