JPH10284234A - Induction heating cooking utensil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an induction heating cooking utensil causing little uneven temperature distribution regardless of the main body configuration of an induction heating cooking utensil. SOLUTION: The ring belt-like area of a vessel bottom face 2 is formed of a magnetic metal material area 3 having first Curie temperature. The Curie temperature of the magnetic metal material 3 having the first Curie temperature is set to be lower than those of the magnetic metal material areas 4, 5 inside and outside thereof having second and third Curie temperatures. Thereby, the temperature of the vessel bottom face can be uniformed in cooking, and it is possible to obtain a vessel having little uneven heating temperature distribution of the vessel bottom face in cooking and is suitable for baking.

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]

To solve the above-mentioned problems, an electromagnetic induction cooker according to the present invention comprises a heating coil disposed inside a main body, and a control means for controlling supply of high-frequency power to the heating coil. And a container body provided with a plurality of magnetic metal materials having different Curie temperatures on a surface facing the heating coil, wherein the control unit controls the temperature of the container body to be at least a value of the plurality of magnetic metal materials. The heating coil is controlled to supply high-frequency power to the heating coil until the highest Curie temperature is reached.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 is provided with a plurality of magnetic metal materials having different Curie temperatures on a surface facing a heating coil, and has the lowest Curie temperature in response to a rise in container temperature due to induction heating. The induction heating output decreases sequentially from the magnetic metal part of the temperature, and the heating is continued until the container temperature reaches at least the highest Curie temperature of the magnetic metal, so that the arrangement of the magnetic metal material and the Curie temperature can be set. The temperature distribution on the heating surface of the induction heating container can be changed arbitrarily, and a temperature distribution on the heating surface suitable for the intended use can be obtained regardless of the main body configuration of the induction heating cooker.

According to a second aspect of the present invention, the annular region of the container heating surface is made of a magnetic metal material having a first Curie temperature, and the remaining portion of the bottom surface is made of a magnetic metal material having a second Curie temperature. The Curie temperature of the magnetic metal material having the first Curie temperature is lower than the Curie temperature of the magnetic metal material having the second Curie temperature. The part almost coincides with the part with strong magnetic force density generated by the heating coil in the induction heating cooker body, the temperature rises more quickly than other parts, it becomes non-magnetic, it is not heated, and the local temperature rise is suppressed. Can be. In addition, since the heating of the other parts continues until the temperature further rises, the temperature of the central portion and the outer peripheral portion of the pot bottom where the magnetic force generated by the induction heating cooker body is weak is high, and a container with less heating temperature distribution unevenness is provided. Can be. And since this action occurs due to the temperature characteristic of the magnetic metal material constituting the container heating surface, it can be obtained regardless of the main body configuration of the induction heating cooker.

According to a third aspect of the present invention, a region along the outer periphery of the heating surface facing the heating coil is made of a magnetic metal material having a first Curie temperature, and the remaining portion of the heating surface has a second Curie temperature. A magnetic metal material, wherein the Curie temperature of the magnetic metal material having the first Curie temperature is higher than the Curie temperature of the magnetic metal material having the second Curie temperature; Since the heating is continued until the temperature becomes higher than the portion, the heat escaping to the side of the container can be compensated, and the temperature can be sufficiently increased.
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.

According to a fourth aspect of the present invention, a region along the outer periphery of the heating surface facing the heating coil is made of a magnetic metal material having a first Curie temperature, and the remaining portion of the heating surface has a second Curie temperature. A magnetic metal material, wherein the Curie temperature of the magnetic metal material having the first Curie temperature is lower than the Curie temperature of the magnetic metal material having the second Curie temperature; Since the region becomes non-magnetic at a lower temperature than the inner portion and stops heating, heat hardly reaches the side surface of the container, the temperature at the center of the heated surface is increased, and the heat dissipation from the side surface can be reduced.
Further, since this action is caused by the temperature characteristics of the magnetic metal material constituting the heating surface, it is possible to obtain a container that performs temperature control regardless of the main body configuration of the induction heating cooker.

According to a fifth aspect of the present invention, one half of the heating surface is made of a magnetic metal material having a first Curie temperature, and the remaining portion of the heating surface is made of a magnetic metal material having a second Curie temperature. The magnetic transition temperature of the magnetic metal material having the first Curie temperature is lower than the Curie temperature of the magnetic metal material having the second Curie temperature, and the magnetic metal having the first Curie temperature of the heating surface. The material region becomes nonmagnetic at a lower temperature than the magnetic metal material region having the second Curie temperature and stops heating, and the magnetic metal material region having the second Curie temperature also stops heating at a higher temperature. A container having two temperature zones on the surface can be provided. Further, since this action is caused by the temperature characteristics of the magnetic metal material constituting the heating surface, it is possible to obtain a container that performs temperature control regardless of the main body configuration of the induction heating cooker.

According to a sixth aspect of the present invention, the annular region of the heating surface is made of a non-magnetic metal, and the remaining region of the heating surface is made of a magnetic metal material having a predetermined Curie temperature. Since the part is not heated, the temperature rise is suppressed in the ring-shaped area of the heating surface, and in the other part the bottom becomes non-magnetic when the temperature rises and heating stops, so the pot bottom generated by the induction heating cooker body has a weak magnetic force The temperature of the central part and the peripheral part can be increased, the temperature is controlled irrespective of the main body configuration of the induction heating cooker, and the container with less unevenness of the heating temperature distribution is made of a magnetic metal material having one kind of predetermined Curie temperature. It can be provided with a simple configuration. Further, the ring-shaped non-magnetic metal region on the heating surface can alleviate the distortion caused by the difference in thermal expansion between the magnetic metal material having a predetermined Curie temperature and the material constituting the container body, and reduce the stress generated on the bottom surface of the pan.

[0012]

【Example】

(Embodiment 1) An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes an induction heating vessel 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.

FIG. 2 shows a state in which the container 1 of the present embodiment is placed on the induction heating cooker main body 6 for heating, and the heating of the induction heating cooker 5, which is usually a donut-shaped disk, is performed. 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.

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, so that 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.

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

(Embodiment 2) Hereinafter, a second embodiment of the present invention will be described with reference to the drawings.

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, it is possible to obtain a convection of the food as if it were rolled into the central part from the side of the container 11, 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 Can be obtained irrespective of the main body configuration.

(Embodiment 3) A third embodiment of the present invention will be described below with reference to the drawings.

In FIGS. 7 and 8, reference numeral 21 denotes an induction heating container main body, 22 denotes a container bottom surface, 26 denotes an induction heating cooker main body, and 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, 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.

(Embodiment 4) Hereinafter, a fourth embodiment of the present invention will be described with reference to the drawings.

In FIGS. 10 and 11, 31 is an induction heating container main body, 32 is a container bottom surface, 36 is an induction heating cooker main body, and 37 is a heating coil, which is the same as those 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, 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.

(Embodiment 5) Hereinafter, a fifth embodiment of the present invention will be described with reference to the drawings.

In FIG. 13, 41 is an induction heating container main body, 42 is a container bottom surface, 46 is 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 body configuration of the induction heating cooker 46, the magnetic metal material 4 having a predetermined Curie temperature
A container capable of controlling the temperature at the Curie temperature of 4 can be obtained.

[0036]

As described above, according to the first aspect of the present invention, a plurality of magnetic metal materials having different Curie temperatures have the lowest Curie temperature corresponding to the rise in the container temperature due to induction heating. The induction heating output decreases sequentially from the metal part, and heating is continued until the container temperature reaches at least the highest Curie temperature of the plurality of magnetic metals. The temperature distribution of the heating surface can be changed arbitrarily according to the purpose of use, regardless of the main body configuration of the induction heating cooker.

According to the second aspect of the present invention, the temperature of the ring-shaped magnetic metal material having the first Curie temperature rises faster than that of the other part, becomes non-magnetic and is not heated. Since the heating of the portion continues until the temperature further rises, the temperature of the central portion and the outer portion of the bottom of the container is increased, the heating temperature non-uniformity is reduced, and an induction heating cooker capable of self-temperature control can be obtained.

According to the third 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 thereof. Can compensate for the heat escaping to the side of the container, and can provide appropriate convection for cooking to the food in the container.

According to the fourth aspect of the present invention, since the magnetic metal material region having a predetermined Curie temperature along the outer periphery of the surface facing the heating coil stops heating at a lower temperature than the inner part, the side surface of the container , The heat radiation from the container can be reduced.

According to the fifth aspect of the present invention, two temperature zones are provided on the surface facing the heating coil, and one container can simultaneously obtain two containers for cooking purposes.

Further, according to the sixth aspect of the present invention, it is possible to obtain a container having less unevenness of the heating temperature distribution with a simple structure while reducing the stress generated on the bottom surface.

[Brief description of the drawings]

FIG. 1 is a perspective view of a container body of an induction heating cooker according to a first embodiment 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 an induction heating cooker according to a second 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 third embodiment 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 fourth 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 fifth 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

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Yoshio Ogino, Inventor 1006 Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (6)

[Claims] 1. A heating coil disposed inside a main body, control means for controlling supply of high-frequency power to the heating coil, and a plurality of magnetic metal materials having different Curie temperatures on a surface facing the heating coil. A control unit that controls the heating coil to supply high-frequency power to the heating coil until the temperature of the container body reaches at least the highest Curie temperature of the plurality of magnetic metal materials. Induction heating cooker. 2. The induction heating cooker according to claim 1, wherein the container main body is formed by arranging a magnetic metal material having a low Curie temperature in an annular shape. 3. The induction heating cooker according to claim 1, wherein the container main body is provided with a magnetic metal material having a high Curie temperature along the outer periphery of a surface facing the heating coil. 4. The induction heating cooker according to claim 1, wherein the container main body is provided with a magnetic metal material having a low Curie temperature along the outer periphery of a surface facing the heating coil. 5. The induction heating cooker according to claim 1, wherein the container body is provided with left and right magnetic metal materials having different Curie temperatures. 6. The induction heating cooker according to claim 1, wherein the container main body is formed by arranging a non-magnetic metal material in an annular shape.