JPS6269481A - Element to be heated for induction heating cooking device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to objects to be heated, such as cooking plates and cooking containers used in induction heating cookers.

BACKGROUND OF THE INVENTION Commonly used in induction cookers. For example, the cooking container used is a metal pot or frying pan. this is,
This is because an eddy current is caused to flow through the container itself due to electromagnetic induction, and the container itself can be used as a heating element. However, for cooking purposes, it is desirable to be able to use non-metallic containers such as clay pots and glass pots. Two A Notification-L/Ad 1
A method has been proposed in which a thin conductive layer of silver or aluminum is formed on the bottom surface of a single peephole using a printing method or a thermal spraying method. As shown in Fig. 6, such conventional containers are made by forming a thin conductive layer 2 of silver or aluminum with a uniform thickness on the bottom surface of a non-metallic container 1 such as an earthenware pot using a printing method or a thermal spraying method. A coating layer 3 for protecting the conductive layer 2 is formed on the conductive layer 2.

Problems to be Solved by the Invention However, in the conventional container 1, since the conductive layer 162 is formed with a uniform thickness, the temperature of the conductive layer 2 heated by the induction heating cooker varies as shown in FIG. shows an uneven temperature distribution. This phenomenon occurs because the strength of the high-frequency magnetic flux generated by the induction heating cooker is uneven, and the temperature distribution is proportional to the strength of the magnetic flux. In such a state, the temperature distribution of the container 1 itself becomes poor, and the food inside the container 1 experiences uneven heating, causing some inconveniences.

The present invention takes the above-mentioned problems into consideration and provides a heated object for an induction heating cooker that can uniformly heat the container so that the container is not heated unevenly and a part of the container is not scorched. It is in.

Means for solving the problems and the technical means of the present invention for solving the above problems are as follows:
A conductive layer is formed on the surface to be placed on the induction heating cooker, and at least part of the conductive layer has a different thickness.

For production According to this technical means, the effect is as follows.

That is, in the induction heating cooker, when the magnetic flux generated by the heating coil passes through the heating body, eddy current is generated.

This eddy current is converted into Joule heat and the heating element generates heat, but the density of the magnetic flux generated by the heating coil that is generally constructed is non-uniform, and if the conductive layer is uniform, the density In the large part, the eddy current becomes large,
The temperature of the heating element becomes high. Therefore, if a portion of the conductive layer is made thicker, the resistance decreases, the current flowing increases, the Joule heat increases, and the temperature of the heating element increases. That is, by increasing the thickness of the conductive layer in the portion where the magnetic flux density is low, it is possible to completely reduce the non-uniformity of the temperature of the heating body due to the magnitude of the magnetic flux density.

Embodiment Hereinafter, one embodiment of the present invention will be described based on the accompanying drawings. In Fig. 1, a thin conductive layer A (6) of silver or aluminum is formed with a uniform thickness on the bottom surface of a non-metallic container 4 such as an earthenware pot using a printing method or a thermal spraying method, and a conductive layer is further applied on top of it. A
Using the same method as in (5), as shown in FIG.
)'klJ It is formed in a shape with the shape removed. Then, a coating layer 7 is formed to protect these conductive layers A(5) and B←).

Next, the operation of the configuration of this embodiment will be explained.

First, when the magnetic flux from the heating coil of the induction heating cooker reaches the conductive layer A15) and the conductive layer B (→), the eddy current
conductive layer 15) and also conductive layer B).

The distribution of magnetic flux density from the heating coil is as shown by the broken line in FIG. 2, and the portion where the conductive layer B (6) is not present has a high density. If there is no conductive layer B←), the temperature distribution on the heating surface will be almost the same as the magnetic flux density distribution.
When the conductive layer B (6) is configured as in this embodiment, the conductive layer B
In the part (s), the thickness of the conductive layer is the sum of the conductive layer A (5) and the conductive layer B (6), the resistance value is small and the eddy current is large, so the Joule heat is absorbed by the conductive layer A ( 61. Therefore, the temperature distribution on the heating surface becomes as shown by the solid line in Fig. 2, and a nearly uniform temperature distribution can be obtained. Although the heating body has been described using a container as an example, it is not limited to this, and a plate as shown in FIG. , metal may be used as long as the material does not inhibit the influence of magnetic flux on the conductive layer.

Effects of the Invention The present invention provides a conductive layer with partially different thicknesses on the bottom of the object to be heated, and the bottom of the object to be heated can be heated with a substantially uniform temperature distribution, which is a welcome feature. -hnn-1 Catering small book
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[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a cooking container for an induction heater according to an embodiment of the present invention, and FIG. 2 is a temperature distribution and magnetic flux density distribution diagram of the heating surface.
FIG. 3 is a plan view of the heating surface, FIG. 4 is a sectional view showing another embodiment of the present invention, and FIG. 6 is a longitudinal sectional view of a conventional cooking container.
FIG. 6 is a temperature distribution diagram of the heating surface. 4... Container (heated object), 5... Conductive layer A, 6... Conductive layer B0 Name of agent Patent attorney Toshio Nakao and 1 other person No. 4
Figure 5 Figure 6

Claims (1)

[Claims] A heated object for an induction heating cooker, in which a conductive layer that becomes a heating element is formed by a high-frequency magnetic field on a surface to be placed on the induction cooker, and at least a portion of the conductive layer has a different thickness.