JP2003077638A - Induction heat-cooking device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem that an induction heat-cooking device of a conventional configuration cannot suppress generation of leakage of magnetic flux or perform efficient heat-cooking when using a pan with a small pan bottom area. SOLUTION: An induction heat-cooking device comprises a heating coil 11 and a high frequency power source 12 for supplying the high frequency current to the heating coil 11, a non-magnetic metal 20 is provided in the vicinity of the circumference of the heating coil 11 in addition to a magnetic metal which also reinforces a casing as a part of the casing 10. By using the configuration of the magnetic body different from the conventional one, the magnetic shielding effect is improved, the magnetic shield can be effectively performed when heating a small pan, the leaking magnetic flux not contributing to the heating is reduced, and the heating efficiency is improved thereby.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an induction heating cooker such as an electromagnetic cooker.

[0002]

2. Description of the Related Art A conventional induction heating cooker has a structure as shown in FIG. FIG. 5 is an internal transparent perspective view showing the overall configuration of a conventional induction heating cooker, and FIG. 6 is a cross-sectional view of a heating coil and its peripheral portion. In the induction heating cooker main body casing 10, a heating coil 11, a high frequency power source 12,
A shield ring 13 and a ferrite magnetic body 14 are provided, and a high-frequency magnetic field is generated by supplying a high-frequency current to the heating coil 11, and Joule heat is generated in the pan to generate heat from the heating coil when cooking. The leakage magnetic flux is reduced by the shield ring 13 and the ferrite magnetic body 14.

[0003]

In the induction heating cooker having the above-mentioned conventional structure, when heating a pan having a smaller bottom area than the area of the heating coil, the magnetic shield effect is not sufficient, and a magnetic flux that does not interlink with the pan. That is, there was a problem that the amount of leakage magnetic flux increased.

[0004]

The present invention has a heating coil and a high-frequency power source for supplying a high-frequency current to the heating coil, and in addition to a magnetic metal that also serves as a reinforcement of the housing as a part of the housing, the heating coil By providing a non-magnetic metal in the vicinity of the surroundings, the magnetic shielding effect is improved, and the magnetic flux is effectively shielded even when heating a small pot, reducing the magnetic flux leakage that does not contribute to heating and improving the heating efficiency. It is used as a cooking device.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION In the invention described in claim 1, in addition to a heating coil and a magnetic metal that also serves as a reinforcement of the housing as a part of the housing, a non-magnetic metal provided around the heating coil is provided,
The leakage magnetic flux from the heating coil is interlinked with the magnetic metal together with the non-magnetic metal to generate a repulsive magnetic flux in a direction to cancel the leakage magnetic flux and to secure the strength of the housing. Therefore, the induction heating cooker is designed to reduce the magnetic flux leakage that does not contribute to heating and improve the heating efficiency.

According to the second aspect of the present invention, by providing a magnetic shield material in the central portion of the heating coil, the magnetic flux is concentrated on the central portion side of the heating coil to reduce the leakage magnetic flux that does not contribute to heating, thereby improving the heating efficiency. It is an induction heating cooker that aims to improve.

According to the third aspect of the present invention, by covering the heating coil from the central portion to the bottom portion to the outer peripheral portion with the magnetic shield material made of resin, the magnetic flux is transferred from the heating coil central portion side to the bottom portion. It is configured to concentrate on the outer peripheral portion. Therefore, the induction heating cooker is designed to reduce the magnetic flux leakage that does not contribute to heating and improve the heating efficiency.

[0008]

(Embodiment 1) A first embodiment of the present invention will be described below. FIG. 1 is an internal transparent perspective view showing the configuration of this embodiment. In this embodiment, the induction heating cooker main body housing 10 is provided with a heating coil 11, a high frequency power supply 12, a shield ring 13, and a non-magnetic metal 20, and the heating coil is provided through a plate (not shown). A pot to be cooked is installed on top of 11. Induction heating cooker body case 1
On the side surface of 0, an iron plate or the like that is a strong magnetic metal is used to configure the main body, and a leakage magnetic flux from the heating coil 11 is interlinked to generate a repulsive magnetic flux, which has a certain magnetic shield effect. ing. Therefore, by providing aluminum, which is a non-magnetic metal having a smaller resistance value than iron, in the form of a plate having a thickness of about 1 mm inside the front surface of the main body 10,
Generate more repulsive magnetic flux to improve the magnetic shield effect. It should be noted that here, although the structure is provided inside the front surface of the main body, it is not necessary to specify the location. With the above configuration, it is possible to provide an induction heating cooker that suppresses leakage magnetic flux and has high heating efficiency.

Second Embodiment Next, a second embodiment of the present invention will be described. FIG. 2 is an internal transparent perspective view showing the configuration of this embodiment. In this embodiment, the first magnetic shield material 21 is provided in the center of the heating coil 11. The central part is where the magnetic flux is concentrated, and it is necessary to use a material and size that do not increase the loss, and use ferrite that does not cause magnetic saturation even if it is small. With this configuration,
It is possible to provide an induction heating cooker that suppresses leakage magnetic flux and has high heating efficiency.

(Third Embodiment) Next, a third embodiment of the present invention will be described. FIG. 3 is an internal transparent perspective view showing the configuration of the present embodiment, and FIG. 4 is a cross-sectional view of an essential part. In this embodiment,
A magnetic shield material made of resin covers the heating coil from the central portion to the outer peripheral portion of the heating coil. In this embodiment, as the magnetic shield material, iron powder or the like is mixed in a resin such as silicon rubber in a weight ratio of about 70 to 80%. For this reason, eddy current due to magnetic flux interlinking does not easily flow in the magnetic shield material, so that loss due to heat generation can be suppressed even if the heating coil 11 is entirely covered. With this configuration, it is possible to provide an induction heating cooker that reduces leakage magnetic flux that does not contribute to heating and improves heating efficiency.

[0011]

As described above, according to the first aspect of the present invention, it is possible to reduce the leakage magnetic flux that does not contribute to heating and improve the heating efficiency.

According to the second aspect of the present invention, it is possible to reduce the leakage magnetic flux that does not contribute to heating and improve the heating efficiency with a smaller magnetic shield structure.

According to the third aspect of the present invention, the magnetic shielding effect is secured, the heat generation in the magnetic shield material itself is suppressed and the loss is small, and the leakage magnetic flux which does not contribute to the heating is reduced as compared with the ferrite magnetic body. However, the heating efficiency can be improved.

[Brief description of drawings]

FIG. 1 is an internal transparent perspective view showing the configuration of an induction heating cooker that is a first embodiment of the present invention.

FIG. 2 is an internal transparent perspective view showing the configuration of an induction heating cooker that is a second embodiment of the present invention.

FIG. 3 is an internal transparent perspective view showing the configuration of an induction heating cooker that is a third embodiment of the present invention.

FIG. 4 is a cross-sectional view of the essential parts showing the configuration of an induction heating cooker that is a third embodiment of the present invention.

FIG. 5 is an internal transparent perspective view showing the configuration of an induction heating cooker as a conventional example.

FIG. 6 is a cross-sectional view of essential parts showing the configuration of an induction heating cooker that is a conventional example.

[Explanation of symbols]

10 whole induction heating cooker 11 heating coil 12 High frequency power supply 13 Shield ring 14 Ferrite magnetic material 20 non-magnetic metal 21 First magnetic shield material 22 Second magnetic shield material

Claims (3)

[Claims] 1. An induction heating cooker comprising: a heating coil; a high-frequency power source; a magnetic metal that also serves as a part of the housing to reinforce the housing; and a non-magnetic metal near the periphery of the heating coil. . 2. The induction heating cooker according to claim 1, wherein a magnetic shield material is provided in a central portion of the heating coil. 3. The induction heating cooker according to claim 1, wherein a magnetic shield material molded of resin is provided over the central portion, the bottom surface portion and the outer peripheral portion of the heating coil.