JP3252746B2 - Induction heating cooker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art This type of induction heating cooker has attracted attention as a feature of high thermal efficiency and safety in which a red heat portion is not directly generated. However, when a heating coil inside a main body is wrapped in a single disk shape, a circular shape is obtained. The magnetic flux density in the center of the width of the plate increases, which tends to cause uneven heating temperature distribution.In addition, the top surface is often formed of a single top plate for easy maintenance. Since it is arranged on the back surface, there is a problem that the temperature detection sensitivity of a heating container such as a pan is weakened.

In order to solve these problems, for example, the heating coil is hardly manufactured by making the center of the width of the heating coil rough, or projecting a temperature sensor from the top plate, or making the top surface of the top surface difficult. Another problem has arisen, such as deteriorating cleanability. Further, since the heating coil is hidden inside the main body, it was not clear from the outside whether the induction heating cooker was wound or not to determine how to improve the heating temperature unevenness.

[0004]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to obtain a temperature distribution on a heating surface of an induction heating cooker suitable for a purpose of use, irrespective of the main body configuration of the induction heating cooker.

[0005]

In order to solve the above-mentioned problems, an induction heating cooker according to the present invention comprises a heating coil disposed inside a main body, and control means for controlling supply of high-frequency power to the heating coil. And a container body in which two types of magnetic metal materials having different Curie temperatures are arranged on the bottom surface, and a magnetic metal material having a high Curie temperature among the magnetic metal materials is arranged along the outer periphery of the container bottom surface, A magnetic metal material having a low Curie temperature is disposed inside, and the control means controls to supply high-frequency power to the heating coil until the temperature of the magnetic substance having a high Curie temperature reaches the Curie temperature. Things.

[0006]

The invention according to claim 1 is characterized in that the heating coil disposed inside the main body, control means for controlling the supply of high-frequency power to the heating coil, and the outer periphery of the bottom surface are formed by the heating coil.
A container main body, which is located near the outer periphery of the thermal coil, and on which two types of magnetic metal materials having different Curie temperatures are arranged on the bottom surface, wherein a magnetic metal material having a high Curie temperature among the magnetic metal materials is provided on the bottom surface of the container. Disposed along the outer periphery of the magnetic material having a low Curie temperature in the remaining portion of the inside, the control means, until the temperature of the high Curie temperature magnetic material reaches the Curie temperature, The heating coil is controlled so as to supply high-frequency power, and the first region along the outer periphery is continuously heated until the temperature becomes higher than other portions, thereby compensating for heat escaping to the side surface of the container. Temperature can be raised sufficiently.
Further, since this action is caused by the temperature characteristics of the magnetic metal material constituting the heating surface of the container, it is possible to obtain a container that performs temperature control regardless of the main body configuration of the induction heating cooker.

[0007]

Embodiment ( Reference Example 1) Hereinafter, a reference example of the present invention will be described with reference to the drawings.

In FIG. 1, reference numeral 1 denotes an induction heating container main body;
3 is a magnetic metal material region having a first Curie temperature on the bottom surface 2, 4 is a magnetic metal material region having a second Curie temperature outside the magnetic metal material region having a first Curie temperature, and 5 is a first Curie temperature. In the magnetic metal material region having the third Curie temperature inside the magnetic metal material region having the temperature, the magnetic metal material region 3 having the first Curie temperature has a radius of about r / 2 when the radius of the pot bottom 2 is r. It is a band-like area. The Curie temperature at which the magnetic metal material region 3 having the first Curie temperature changes from magnetic to non-magnetic is lower than the magnetic metal material regions 4 and 5 having the second and third Curie temperatures inside and outside thereof. And the magnetic metal material regions 4 and 5 having the third Curie temperature have the same Curie temperature.

[0009] Figure 2 shows a state in which heating at a container 1 of the present embodiment on the induction cooking device body 6, the heating of the induction heating cooker 5 became normal donut-shaped disc Assuming that the inner circumference of the coil 7 is R1 and the outer circumference is R2, the magnetic flux distribution is strongest near (R1 + R2) / 2, and the temperature of the container bottom 2 tends to rise most. By forming the ring-shaped first region 3 having a half radius r from the center with a magnetic metal material having a first Curie temperature that changes at a lower temperature than other portions, the magnetic flux density in this portion is reduced. High, temperature rise in second and third areas 4
・ Because it is faster than 5, it becomes non-magnetic sooner than other parts and is not heated.

On the other hand, the second and third regions 4 and 5 where the magnetic force is weak
Is heated until the temperature becomes higher than the first region 3 as shown by a broken line in FIG. 3, but as shown by a solid line in FIG. The soaking can be achieved. For this reason, it is possible to provide a container suitable for grilling and having less uneven heating temperature distribution during cooking.

Further, since this action is caused by the temperature characteristics of the magnetic metal materials 3, 4, 5 having the first, second, and third Curie temperatures constituting the bottom surface 2 of the container 1, the induction heating cooker 6 It is possible to provide a pot that automatically performs temperature control regardless of the configuration of the main body.

When the Curie temperature of the magnetic metal material 3 having the first Curie temperature is about 250 ° C. and the Curie temperature of the magnetic metal materials 4 and 5 having the second and third Curie temperatures is about 300 ° C. The temperature is suitable for a plate for pottery.

[0013] will be described with reference to the drawings (Example 1) following the first embodiment of the present invention.

4 and 5, reference numeral 11 denotes an induction heating container main body, reference numeral 12 denotes a container bottom surface, reference numeral 16 denotes an induction heating cooker main body, and reference numeral 17 denotes a heating coil, which is the same as those shown in FIGS. What is different is that the configuration of the container bottom 12 is a magnetic metal material 13 having a first Curie temperature in a region along the outer periphery, and a magnetic metal material 14 having a second Curie temperature in the remaining bottom portion. The point is that the Curie temperature of the magnetic metal material 13 having the Curie temperature is higher than the Curie temperature of the magnetic metal material 14 having the second Curie temperature.

The operation of the induction cooking device configured as described above will be described below. Assuming that the radius of the heating coil 17 is R, the outer periphery of the container bottom 12 is
Is located in the vicinity of the outer periphery and has a weak magnetic force distribution generated by the induction heating cooker main body 16, so that the amount of heat generated by the induction heating is small, and the heat escapes to the side surface of the container 11, so that the temperature does not easily rise. Therefore, a region along the outer periphery of the container bottom surface 12 is formed by a magnetic metal material 13 having a first Curie temperature.
The magnetic metal material 1 having an inner second Curie temperature
By making the characteristic change from magnetic to non-magnetic at a temperature higher than 4, heating is continued until the temperature becomes higher than the inner peripheral portion of the container bottom 12. For this reason, as shown in FIG. 6, when the container 11 is cooked in an empty state, the magnetic metal material 13 having the first Curie temperature near the heating coil radius R at the outer peripheral portion of the container bottom 12 is compensated by supplementing the heat escaping to the side surface. The temperature can be sufficiently higher than the magnetic metal material 14 having the second inner Curie temperature.

Further, at the time of cooking using the container 11, convection of the food can be obtained as shown in FIG. .

Further, since this action is caused by the temperature characteristics of the magnetic metal material 13 having the first Curie temperature and the magnetic metal material 14 having the second Curie temperature constituting the container bottom surface 12, the induction heating cooker 16 is provided. Can be obtained irrespective of the main body configuration.

[0018] will be described with reference to the drawings second reference example (Example 2) The following present invention.

In FIGS. 7 and 8, reference numeral 21 denotes an induction heating container main body, reference numeral 22 denotes a container bottom surface, reference numeral 26 denotes an induction heating cooker main body, and reference numeral 27 denotes a heating coil, which is the same as those shown in FIGS. The difference is that the configuration of the container bottom 22 is a magnetic metal material 23 having a first Curie temperature in a region along the outer periphery, and a magnetic metal material 24 having a second Curie temperature in the remaining bottom portion. The point is that the Curie temperature of the magnetic metal material 23 having the Curie temperature is lower than the Curie temperature of the magnetic metal material 24 having the second Curie temperature.

The operation of the induction cooking device configured as described above will be described below. Since the magnetic metal material 23 having the first Curie temperature, which is a region along the outer periphery of the bottom surface 22, becomes non-magnetic at a lower temperature than the magnetic metal material 24 having the second Curie temperature of the inner portion, heating stops. It is difficult for heat to reach the side of the container 21. As shown in FIG. 9, the temperature of the center of the container bottom 22 is increased, the temperature of the side is reduced, and the heat dissipation from the side is reduced to improve the heat efficiency. Can be achieved. In addition, taking advantage of the heating temperature characteristics shown in FIG.
Can be obtained.

Further, since this action is caused by the temperature characteristics of the magnetic metal material 23 having the first Curie temperature and the magnetic metal material 24 having the second Curie temperature constituting the container bottom surface 22, the induction heating cooking is performed. It is possible to provide a container that performs temperature control regardless of the main body configuration of the vessel 26.

[0022] will be described with reference to the drawings third reference example (Example 3) The following present invention.

In FIGS. 10 and 11, reference numeral 31 denotes an induction heating container main body, 32 denotes a container bottom surface, 36 denotes an induction heating cooker main body, and 37 denotes a heating coil, which has the same configuration as that shown in FIGS. 1 and 2. The difference is that the bottom 32 is divided into two parts,
One side region is a magnetic metal material 33 having a first Curie temperature, the remaining portion of the bottom surface is a magnetic metal material 34 having a second Curie temperature, and the Curie temperature of the magnetic metal material 33 having a first Curie temperature. Is lower than the Curie temperature of the magnetic metal material 34 having the second Curie temperature.

The operation of the induction cooking device configured as described above will be described below. The magnetic metal material 33 having the first Curie temperature, which is a bisected one side region of the bottom surface 32, becomes non-magnetic at a lower temperature than the magnetic metal material 34 having the second Curie temperature of the remaining portion, and stops heating. Therefore, as shown in FIG. 12, a temperature of the container bottom 32 is obtained in two regions of a high-temperature portion C and a low-temperature portion D, and a plate for a pottery having a cooking portion and a warming portion, or a high-temperature cooking portion and a low-temperature cooking portion. Can be obtained.

Further, since this action is caused by the temperature characteristics of the magnetic metal material 33 having the first Curie temperature and the magnetic metal material 34 having the second Curie temperature constituting the container bottom surface 32, the induction heating cooking is performed. It is possible to provide a container that performs temperature control regardless of the main body configuration of the vessel 36.

[0026] will be described with reference to the drawings fourth reference example (Example 4) following the present invention.

In FIG. 13, reference numeral 41 denotes an induction heating container main body, 42 denotes a container bottom surface, 46 denotes an induction heating cooker main body, 47
Is a heating coil similar to the configuration of FIG. 2 except that the configuration of the container bottom surface 42 is a ring-shaped region 43 of approximately half the radius, for example, an aluminum alloy integrated with the container 42 body. In that the remaining portion of the bottom surface is made of a magnetic metal material 44 having a predetermined Curie temperature.

The operation of the induction cooking device configured as described above will be described below. Non-magnetic metal portion 43 in a ring-shaped region having a half radius from the center of bottom surface 42
Is not heated, and the other portions are heated to the Curie temperature of the magnetic metal material 44 having a predetermined Curie temperature. Therefore, as shown in FIG. While the temperature distribution has a temperature peak in the approximate center on the left and right as indicated by the broken line,
As shown by the solid line in the drawing, the container of the present embodiment has a high temperature in the center and the outer peripheral portion of the pot bottom where the magnetic force is weak, which is generated by the induction heating cooker main body 46, and obtains a container with less uneven heating temperature distribution. Can be.

Also, approximately one-half of the radius from the center of the bottom surface 42
The ring-shaped region is made of an aluminum alloy integral with the container body and is softer than the magnetic metal material 44 having a predetermined Curie temperature, which is a stainless steel material. The stress caused by the difference in thermal expansion with the metal material 44 can be absorbed and reduced.

Further, regardless of the configuration of the main body of the induction heating cooker 46, the magnetic metal material 4 having a predetermined Curie temperature is used.
A container capable of controlling the temperature at the Curie temperature of 4 can be obtained.

[0031]

As described above, according to the first aspect of the present invention, the magnetic metal material region having a predetermined Curie temperature along the outer periphery of the surface facing the heating coil is heated until the temperature becomes higher than the inner portion. Therefore, the heat escaping to the side of the container can be compensated for, and the convection appropriate for cooking can be given to the food in the container.

[Brief description of the drawings]

FIG. 1 is a perspective view of a container main body of an induction heating cooker according to a first reference example of the present invention.

FIG. 2 is a sectional view of a main part of the induction heating cooker.

FIG. 3 is a temperature characteristic diagram of a container body of the induction heating cooker.

FIG. 4 is a perspective view of a container body of the induction heating cooker according to the first embodiment of the present invention.

FIG. 5 is a sectional view of a main part of the induction heating cooker.

FIG. 6 is a temperature characteristic diagram of a container body of the induction heating cooker.

FIG. 7 is a perspective view of a container body of an induction heating cooker according to a second reference example of the present invention.

FIG. 8 is a sectional view of a main part of the induction heating cooker.

FIG. 9 is a temperature characteristic diagram of the container body of the induction heating cooker.

FIG. 10 is a perspective view of a container body of an induction heating cooker according to a third embodiment of the present invention.

FIG. 11 is a sectional view of a main part of the induction heating cooker.

FIG. 12 is a temperature characteristic diagram of a container body of the induction heating cooker.

FIG. 13 is a sectional view of a main part of an induction heating cooker according to a fourth embodiment of the present invention.

FIG. 14 is a temperature characteristic diagram of the container body of the induction heating cooker.

[Explanation of symbols]

1, 11, 21, 31, 41 Container main body 2, 12, 22, 32, 42 Container bottom 3, 13, 23, 33 Magnetic metal material having first Curie temperature 4, 14, 24, 34 Second Curie Magnetic metal material having a temperature 5 Magnetic metal material having a third Curie temperature 43 Nonmagnetic metal 44 Magnetic metal material having a predetermined Curie temperature

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshio Ogino 1006 Kazuma Kadoma, Kadoma-shi, Osaka Matsushita Electric Industrial Co., Ltd. (56) References JP-A-6-275371 (JP, A) JP-A-3-3 246880 (JP, A) Japanese Utility Model sho 59-104497 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H05B 6/12 314

Claims (1)

(57) [Claims] 1. A heating coil disposed inside a main body, control means for controlling supply of high-frequency power to the heating coil, and an outer periphery of a bottom surface is located near an outer periphery of the heating coil.
And a container body in which two kinds of magnetic metal materials having different Curie temperatures are arranged on the bottom surface, and a magnetic metal material having a high Curie temperature among the magnetic metal materials is arranged along the outer periphery of the container bottom surface, A magnetic metal material having a low Curie temperature is disposed in the remaining portion inside the magnetic material, and the control means supplies high-frequency power to the heating coil until the temperature of the magnetic material having a high Curie temperature reaches the Curie temperature. Induction heating cooker controlled as needed.