JP3079573B2 - Pot for induction cooker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pot for an electromagnetic cooker having a self-temperature control function.

[0002]

2. Description of the Related Art Electromagnetic induction heating cookers (hereinafter referred to as electromagnetic cookers)
Has a heating coil disposed below the top plate, and the lines of magnetic force generated by the heating coil cause an eddy current in the bottom surface of the electromagnetic cooker pan on the top plate to generate heat.

Conventionally, as such a pan for an electromagnetic cooker, a pan made of a magnetic metal material (iron, SUS430 stainless steel), a magnetic metal material (iron, SUS430 stainless steel, etc.) and a non-magnetic metal material (aluminum, SUS304 stainless steel, etc.) are conventionally used. ) And a cladding material (two or multiple layers) are often used.

[0004] Such a conventional pot is used after the temperature is controlled by a thermistor installed on the back surface of the top plate.

[0005]

However, in such a conventional electromagnetic cooker, since the thermal conductivity of the crystallized glass used for the top plate is small, the actual temperature of the pot for the electromagnetic cooker and the thermistor are not so large. The temperature difference from the perceived temperature increases, the thermal responsiveness is poor, and it is difficult to control the temperature during abnormal use such as cooking, and there is a problem in the case of using a metal material that the bottom surface may be significantly warped or deformed. .

A first object of the present invention is to solve the above-mentioned conventional problems, and to provide a pot for an electromagnetic cooker having a self-temperature control function.

A second object of the present invention is to solve the above-mentioned conventional problems and to provide a pot for an electromagnetic cooker which can be reduced in weight.

[0008]

Means for Solving the Problems In order to achieve the above object, the object of the present invention is to solve the problem of an electromagnetic cooker pan (hereinafter referred to as an electromagnetic pan) by converting a magnetic metal material having a predetermined Curie temperature into a nonmagnetic metal It shall have a self-temperature control function provided at least on the outer surface of the bottom of the pan made of the material.

Further, the above-mentioned non-magnetic metal material is formed of a good heat conductor.

[0010]

According to the present invention, when the temperature of the electromagnetic pot is below the Curie temperature, the alternating magnetic flux radiated from the heating coil flows to the outer magnetic metal material, but the magnetic flux is induced by the alternating magnetic flux due to its high magnetic permeability. The eddy current is concentrated on the bottom side of the electromagnetic pan due to the skin effect of the high frequency current.

For this reason, the alternating magnetic flux almost flows to the outer magnetic metal material and is not affected by the inner non-magnetic metal material.

As a result, the eddy current flows intensively on the outer surface of the magnetic metal material (the bottom side of the pan), the electric resistance of the electromagnetic pan becomes equivalently large, and the Joule heat generated by the eddy current increases. The heat value of the induction heating increases.

On the other hand, when the temperature is higher than the Curie temperature, the magnetic metal material loses magnetism, so that the magnetic permeability decreases and the penetration depth of the eddy current (the depth from the surface until the surface current decreases to a certain rate) increases.

Therefore, the eddy current due to the alternating magnetic field also flows through the inner non-magnetic metal material, and the eddy current flows through the entire cross-sectional area of the entire bottom side of the electromagnetic pot, so that the equivalent electric resistance is reduced. In addition, the generated Joule heat is small, and the calorific value of induction heating is small.

Here, the state of the change of the heating operation will be described in further order. When heating is started from normal temperature, the heating is performed with a large amount of heat until the Curie temperature is reached, and as a result, the electromagnetic pot reaches the Curie temperature. Then, the electromagnetic pot itself changes its characteristics automatically and the amount of generated heat is reduced.

Then, when the temperature of the electromagnetic pot falls and becomes equal to or lower than the Curie temperature, the outer magnetic metal material regains magnetism and resumes heating with a large calorific value.

Here, when the Curie temperature of the outer magnetic metal material is selected to a desired set temperature, the electromagnetic pot itself can automatically control the amount of heat generated by the above operation.

Further, if a material having a lower electric resistance (heat conductor) than the outer magnetic metal material is selected as the inner non-magnetic metal material, the difference in electric resistance before and after the Curie temperature is further increased. Control width can be increased.

For this reason, by setting the Curie temperature to the temperature desired to be controlled, the temperature can be controlled accurately.

By using a heat conductor as the inner non-magnetic metal material in the above, the unevenness of the temperature distribution due to the poor heat conduction of the magnetic metal material is eliminated, and the temperature of the food inside the electromagnetic pan becomes uniform. And the cooking performance is significantly improved.

In particular, when used as an electromagnetic pot using water or oil, the Curie temperature of the magnetic metal material is optimally 300 ° C. or less, and specific magnetic metal materials include nickel alloys and iron-chromium alloys. Is good.

Further, as the non-magnetic metal material on the inner side where the food is put, it is preferable to use aluminum or copper which is a good heat conductor having excellent heat conductivity.

On the other hand, as a method of integrating the magnetic metal material into at least the outer surface of the bottom of the pot made of a non-magnetic metal material, a clad material, bonding with a brazing material or an inorganic adhesive, or hot pressing is used. It may be pressed. The part to be integrated may be at least a part facing the heating coil, and may be expanded to a further part,
Lightening is slightly impaired.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described with reference to the accompanying drawings.

(Embodiment 1) FIG. 1 is a sectional view of an electromagnetic cooker pan according to Embodiment 1 of the present invention.

In the drawing, reference numeral 1 denotes a pan for an electromagnetic cooker (electromagnetic pan), in which the inside of the cooker is made of a non-magnetic metal material 1a made of aluminum, which is a good conductor of heat, and 180 degrees outside. And a magnetic metal material 1b made of a nickel alloy having a Curie temperature of

This electromagnetic pot 1 was formed by drawing using a clad material made of the above-mentioned two types of metal materials.

In order to evaluate the electromagnetic pan 1, oil was put into the electromagnetic pan 1, and the oil was put on a top plate of a conventional electromagnetic cooker, and tempura cooking was performed.

At this time, the temperature of the electromagnetic pot 1 was automatically turned on / off at a boundary of 180 degrees to perform temperature control, and the oil temperature was controlled to 180 degrees.

Further, even if the temperature of each part of the oil is measured, 180
The degree was very uniform. As a result, the tempura was cooked well.

(Embodiment 2) FIG. 2 is a sectional view of an electromagnetic pot according to Embodiment 2 of the present invention.

That is, reference numeral 2 denotes an electromagnetic pot, and the inner side for holding the food is made of the same non-magnetic metal material 2a as a heat conductor made of aluminum as in the first embodiment.

On the outside of the bottom surface of the non-magnetic metal material 2a facing the heating coil of the electromagnetic cooker, a magnetic metal material 2b made of a nickel alloy having a 180 ° Curie temperature is hot-pressed under a high temperature condition not lower than the Curie temperature. They are integrated by pressure welding.

When the evaluation of the electromagnetic pot 2 was performed in the same manner as in Example 1, the same effect was obtained. Further, compared to the pot of Example 1, it was very light and very convenient.

Further, the same tempura cooking was carried out in the electromagnetic pan 2 using SUS304 stainless steel as the non-magnetic metal material in the first and second embodiments, but the one using the above-mentioned aluminum good conductor was better. Temperature control accuracy is good and you can cook tempura with good skill, and also light weight,
It became more convenient.

As is clear from the above two embodiments, the electromagnetic cooker pan of the present invention has a self-temperature control function, and has remarkable effects such as improving cooking performance and safety such as ignition of oil. Was done.

In the embodiment of the present invention, aluminum or S is used as the non-magnetic metal material 1a, 2a for storing the food.
Although US304 stainless steel was used, the material is not particularly limited thereto, and a metal material such as copper may be used.

Although a nickel alloy is used as a magnetic metal material having a Curie temperature, the present invention is not limited to this.

Further, although the description has been given of the case where the Curie temperature is 180 degrees, the present invention is not particularly limited to this temperature.

[0040]

As is apparent from the above description, the electromagnetic cooker pan of the present invention is provided by providing a magnetic metal material having a predetermined Curie temperature on at least the outer surface of the bottom of the pan made of a non-magnetic metal material. An electromagnetic cooker pot having a self-temperature control function can be provided.

By using a non-magnetic metal material as a good heat conductor, the temperature distribution of the electromagnetic cooker pan is improved, the cooking performance is remarkably improved, the weight can be further reduced, and the usability is improved.

At the same time, the electromagnetic induction heating cooker not only does not require the conventional thermistor on the lower surface of the top plate, but also does not cause a danger such as a fire if an abnormality such as cooking occurs from the electromagnetic cooking pot. .

[Brief description of the drawings]

FIG. 1A is a cross-sectional view of an electromagnetic cooker pot according to a first embodiment of the present invention. FIG. 1B is an enlarged cross-sectional view of a portion A in FIG.

FIG. 2A is a cross-sectional view of an electromagnetic cooker pot according to the second embodiment. FIG.

[Explanation of symbols]

 1, 2 Pot for electromagnetic cooker 1a, 2a Non-magnetic metal material 1b, 2b Magnetic metal material

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H05B 6/12

Claims (2)

(57) [Claims] 1. A pot for an electromagnetic cooker having a self-temperature control function, wherein a magnetic metal material having a predetermined Curie temperature is provided on at least the outer surface of the bottom of a pan made of a non-magnetic metal material. 2. The pot for an electromagnetic cooker according to claim 1, wherein the non-magnetic metal material is made of a heat conductor.