JPH09161964A - Electromagnetic cooking appliance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To uniformly and safely heat the upper and lower faces of a heated object arranged between both metal plates by providing a uniform heating means between the induction-heating bottom metal plate and upper metal plate of a heating container. SOLUTION: A heating coil 1 is arranged below a top plate 4 mounted with a toast heating container 11. A bottom metal plate 13 is provided on a heat- resistant holding plate 14 in the heating container 11, bread 10 to be heated is arranged at the prescribed interval from the bottom metal plate 13 via a pedestal 12, and an upper metal plate 7 is arranged above it. High-frequency power is applied to the heating coil 1 from an inverter circuit 2 via an operation section 3 to generate a high-frequency magnetic field. The bottom metal plate 13 is induction-heated by the high-frequency magnetic field, and the upper metal plate 7 is induction-heated by part of the high-frequency magnetic field not interlinked with the bottom metal plate 13. The lower face of the bread 10 is heated by the radiation heat from the bottom metal plate 13 equally to the upper face.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic cooker for induction heating an object to be heated by a high frequency magnetic field, and more particularly to an electromagnetic cooker having a heating container for toast.

[0002]

2. Description of the Related Art Induction cookers are safe without fire and have excellent thermal efficiency, and are rapidly becoming popular for household and business use. In such an electromagnetic cooker, a heating container for toast dedicated to baking bread using induction heating has been proposed (JP-A-5-89954). FIG. 11 is a cross-sectional view of the main configuration of the electromagnetic cooker and the toast heating container, and FIG. 12 is a perspective view of the toast heating container with the upper metal opened. In these figures, 1 is a heating coil, 2 is an inverter circuit that supplies high-frequency current to the heating coil 1 and controls the heating power by varying the current value.
Is an operation unit for instructing setting input, toast heating, and the like. A heating container 5 for toast placed on the top plate 4 is provided with a mesh-shaped bottom metal 6, a plate-shaped upper metal 7, and a support 9 for rotatably supporting the upper metal 7. The toast heating container 5 itself is made of a non-metal non-magnetic material such as plastic. 8 is the upper metal 7
It is a handle to hold when opening.

With such a structure, toast making with an electromagnetic cooker is performed as follows. First, the toast heating container 5 is placed on the top plate 4, the upper metal 7 is lifted to place the pan 10 on the bottom metal 6, and the upper metal 7 is rotated so as to contact the upper surface of the pan 10. Then, the toast heating key on the operation unit 3 is pressed. When the toast heating key is pressed, the inverter circuit 2 is driven and the high frequency current is supplied to the heating coil 1 for a predetermined time. At this time, the bottom metal 6 is induction-heated by the high-frequency magnetic flux generated from the heating coil 1. At the same time, a part of the high-frequency magnetic flux passes through the mesh of the bottom metal 6 and reaches the top metal 7, and the top metal 7 is also induction-heated. This makes it possible to heat the upper and lower surfaces of the bread 10 at the same time.

[0004]

However, the conventional heating container for toast has the following problems. That is, the strength of the high frequency magnetic field generated from the heating coil 1 becomes weaker as the distance from the heating coil 1 increases. Therefore, as shown in FIG. 13, the temperature of the bottom metal 6 rises faster than the temperature of the top metal 7. For example, the temperature of the upper metal 7 is the temperature T at which the bread 10 is just baked.
At time t ₀ , the temperature of the bottom metal 6 has reached a considerably high temperature, and the bottom surface of the pan 10 is scorched. Further, since the bottom metal 6 has a mesh-like shape, even the bottom surface of the pan 10 is burnt where it is in contact with the bottom metal 6, and the space between the meshes is not fully baked so that a uniform heating state is not obtained. As described above, in the conventional heating container for toast, the upper and lower surfaces of the bread 10 can be simultaneously heated, but it is extremely difficult to uniformly heat the upper and lower surfaces at the same time.

[0005] The present invention has been made in view of the above,
An object of the present invention is to provide an electromagnetic cooker having a heating container capable of heating the upper and lower surfaces of an object to be heated uniformly and safely at the same time.

[0006]

In order to solve the above problems, the invention according to claim 1 has a heating container having a bottom metal plate and an upper metal plate, and the heating container is provided on the lower surface side. The heating coil is placed on the top plate, and the bottom metal plate and the top metal plate are simultaneously induction-heated by the high-frequency magnetic field from the heating coil, and placed between the bottom metal plate and the top metal plate. An electromagnetic cooker for heating an object to be heated,
The gist is that the heating container is provided with a uniform heating means for heating the upper and lower surfaces of the object to be heated uniformly. With this configuration, it is possible to heat the upper and lower surfaces of the bread, etc., which is the object to be heated, at the same time, and since the bottom metal has a plate shape, the temperature distribution of the bottom metal plate is more uniform than before. Therefore, it becomes possible to uniformly heat the lower surface of the bread or the like that is the object to be heated.

According to a second aspect of the present invention, in the electromagnetic cooker according to the first aspect, the uniform heating means sets a distance between the object to be heated and the bottom metal plate to the object to be heated and the upper metal plate. The gist is that the structure is made larger by a predetermined amount than the distance between and. With this configuration, the lower surface of the object to be heated and the bottom metal plate are separated from each other at a predetermined interval such that the temperature increase of the atmosphere on the lower surface of the bread or the like to be heated becomes substantially the same as the temperature increase of the upper metal plate. By heating the lower surface of the object to be heated with the radiant heat from the bottom metal plate, the temperature increase of the upper metal plate, that is, the upper surface of the object to be heated can be made substantially the same as that of the lower surface of the object to be heated. It is possible to heat the upper and lower surfaces of the bread and the like at the same time evenly.

A third aspect of the present invention provides the electromagnetic cooker according to the second aspect, wherein the heat capacity of the bottom metal plate is larger than that of the upper metal plate. With this configuration, the temperature rising rate of the bottom metal plate becomes slower, and the upper metal plate, that is, the lower surface of the object to be heated for making the temperature increase of the upper surface of the object to be heated and the lower surface of the object to be heated substantially the same. It is possible to further reduce the distance from the bottom metal plate. As a result, the gap between the upper metal plate and the heating coil is reduced by the reduced gap, and the heating finishing time can be shortened.

According to a fourth aspect of the invention, in the electromagnetic cooker according to the second aspect, a heat transfer adjusting plate that receives radiant heat from the bottom metal plate is installed above the bottom metal plate, and the heat transfer adjustment is performed. The gist is that the object to be heated is placed between a plate and the upper metal plate. With this configuration, the heat transfer adjusting plate has a good heat transfer property, so that the temperature distribution in the lateral direction becomes uniform, and the lower surface of the bread or the like that is the object to be heated can be heated more uniformly.

A fifth aspect of the present invention provides the electromagnetic cooker according to the second aspect, wherein the bottom metal plate is formed in a ring shape. With this configuration, the high-frequency magnetic flux from the heating coil easily leaks, reaches more of the upper metal plate, and the heating finishing time can be shortened.

A sixth aspect of the present invention provides the electromagnetic cooker according to the fifth aspect, wherein a magnetic material having a high magnetic permeability is installed in a central portion of the bottom of the heating container. With this configuration, a large amount of high-frequency magnetic flux near the center of the heating coil reaches the upper metal plate, and the heating finishing time can be further shortened.

A seventh aspect of the present invention provides the electromagnetic cooker according to the second aspect, wherein a side plate is attached to the upper metal plate toward the inside of the heating container. With this configuration, a magnetic path is easily formed in the upper metal plate, more high-frequency magnetic flux from the heating coil arrives, and the heating finishing time can be shortened.

According to an eighth aspect of the present invention, in the electromagnetic cooker according to the first aspect, the heating container is made of a non-metallic material and is housed so as to cover the bottom metal plate and the upper metal plate. That is the summary. With this configuration, there is no danger of being burned during the heat treatment, and safety is ensured.

According to a ninth aspect of the present invention, a ring-shaped bottom metal plate, a high-permeability magnetic body installed in the center of the bottom, an upper metal plate with side plates, and a metal plate installed above the bottom metal plate. The heat transfer adjusting plate that receives radiant heat from the bottom metal plate is housed in a heating container made of a non-metallic material, and the heating container is placed on a top plate on which a heating coil is arranged on the lower surface side, It is configured such that the bottom metal plate and the top metal plate are simultaneously induction-heated by a high-frequency magnetic field from the heating coil to heat an object to be heated placed between the heat transfer adjusting plate and the top metal plate. Is the gist. With this configuration, the high frequency magnetic flux from the heating coil easily leaks to the upper metal plate side, and a magnetic path is easily formed in the upper metal plate, so that the high frequency magnetic flux reaches the upper metal plate more, while the bottom metal plate Even if the temperature rises faster due to the ring-shaped heat capacity and the heat capacity decreases, the effect is suppressed by the heat transfer adjustment plate, and the temperature rise on the upper metal plate, that is, the upper surface of the object to be heated and the object to be heated. Since the temperature rise of the lower surface becomes substantially the same, it becomes possible to simultaneously heat the upper and lower surfaces of the bread or the like, which is the object to be heated, uniformly and in a short time. Further, since the heat transfer adjusting plate has a good heat transfer property, the temperature distribution in the lateral direction becomes uniform, and it becomes possible to heat the lower surface of the bread or the like which is the object to be heated more uniformly.

A tenth aspect of the present invention provides the electromagnetic cooker according to the first or ninth aspect, wherein the upper metal plate is configured to be slidable in the vertical direction. With this configuration, even if the thickness of the bread or the like to be heated changes, it is possible to appropriately cope with this.

The invention of claim 11 is the electromagnetic cooker according to claim 8 or 9, wherein the heating container is provided with a vent hole. With this configuration, gas such as steam generated during heating of the object to be heated escapes to the outside to ensure safety.

According to a twelfth aspect of the present invention, in the electromagnetic cooker according to the first or ninth aspect, the center of the heating container is aligned with the center of the heating coil when the heating container is placed on the top plate. The gist is that the aligning means for providing is provided on the top plate. With this configuration, a large amount of high-frequency magnetic flux from the heating coil reaches the bottom metal plate and the top metal plate, and these metal plates can be efficiently heated.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 3 are views showing a first embodiment of the present invention. FIG. 1 is a sectional view of the toast heating container, and FIG. 2 is a perspective view of the toast heating container with an upper metal plate opened. In this figure and the following figures, the same or corresponding parts as those described in the conventional example are designated by the same reference numerals, and a duplicate description will be omitted.

1 and 2, 11 is a heating container for a toast made of a non-metal non-magnetic material, 13 is a disk-shaped bottom metal plate, 14 is a heat-resistant holding plate for adhesively holding the bottom metal plate 13, and 12 is A pedestal for isolating the bread 10 as the object to be heated from the bottom metal plate 13 for a predetermined time, and 15 for placing the toast heating container 11 so that the center of the toast heating container 11 coincides with the center of the heating coil 1. It is a hook-shaped line drawn on the top plate 4.

With such a structure, toast making with an electromagnetic cooker is performed as follows. First, the toast heating container 11 is placed in line with the hook-shaped line 15 on the top plate 4, the upper metal plate 7 is lifted and the pan 10 is placed on the pedestal 12, and the upper metal plate 7 is placed on the upper surface of the pan 10. Rotate to touch. Then, the toast heating key on the operation unit 3 is pressed. When the toast heating key is pressed,
The inverter circuit 2 is driven and a high frequency current is supplied to the heating coil 1 for a predetermined time. At this time, the bottom metal plate 13 is induction-heated by the high-frequency magnetic flux generated from the heating coil 1. At the same time, a part of high-frequency magnetic flux that does not interlink with the bottom metal plate 13 reaches the upper metal plate 7, and the upper metal plate 7 is also induction-heated. In the present embodiment, the bottom surface of the pan 10 is not directly heated by the bottom metal plate 13, but is separated upward by an interval such that the temperature increase of the atmosphere on the bottom surface of the pan 10 is the same as the temperature increase of the upper metal plate 7. And is heated by radiant heat from the bottom metal plate 13. As a result, as shown in FIG. 3, the temperature rise of the upper metal plate 7, that is, the upper surface of the pan 10 and the temperature rise of the lower surface of the pan 10 become substantially the same, and the upper and lower surfaces of the pan 10 can be heated uniformly at the same time. Becomes Also, the bottom metal plate 13
Since the plate has a disk shape, the temperature distribution of the bottom metal plate 13 becomes more uniform than before, and the lower surface of the pan 10 can be heated uniformly. However, in terms of heating time, the distance between the upper metal plate 7 and the heating coil 1 is larger than in the conventional case, so the pan 1
The heating time t _{1 of} 0 becomes longer.

4 to 7 show a second embodiment of the present invention. FIG. 4 is a sectional view of a heating container for toast, FIG.
FIG. 6 is a perspective view of the heating container for toast with the upper container portion opened, and FIG. 6 is an enlarged view of the support piece portion in FIG. 4.
In FIGS. 4 and 5, reference numeral 16 is a heating container for a toast made of a non-metal non-magnetic material, and the upper metal plate 7 and the bottom metal plate 17 are completely covered so as not to be burned while the bread 10 is heated. There is. This toast heating container 16 includes an upper container part 16 a having an upper metal plate 7 and a bottom metal plate 17.
It is divided into two lower container portions 16b having a. 21
Is a hinge that connects the upper container portion 16a and the lower container portion 16b, and a handle 19 provided on the upper container portion 16a.
The upper container portion 16a is made rotatable when lifted by holding. Reference numeral 20 denotes an upper container portion 16a when the heating container 16 for toast is stored or carried.
Is a hook provided on the side of the lower container portion 16b so as not to open. Reference numeral 23 is a hole for removing gas such as steam generated during heating of the bread 10 and is provided in the upper container portion 16a. The bottom metal plate 17 has a disk shape and is thicker than that in the first embodiment, and due to this thickness, the heat capacity of the bottom metal plate 17 is larger than that of the upper metal plate 7. Reference numeral 18 denotes a pedestal for isolating the bread 10 from the bottom metal plate 17 for a predetermined time, which is shorter than that in the first embodiment. 16c is a heating container for toast 1.
In order to place the heating container 16 for toasts so that the center of 6 may match the center of the heating coil 1, the heating container 16 for toasts
Is a convex portion provided on the top plate 4 and is adapted to be pushed into a corresponding concave portion on the top plate 4 when the toast heating container 16 is placed. Reference numeral 22 is a support piece for holding the upper metal plate 7 in the upper container portion 16a, and is fixed to the upper container portion 16a with bolts 24 as shown in FIG. The upper metal plate 7 is held in a state in which the support pieces 22 are passed through the holes 25 formed at the four corners, and is slidable up and down. In a normal holding state, the interval between the upper metal plate 7 and the pedestal 18 is set so as to cut into eight and have a pan thickness.

With such a structure, toast making with an electromagnetic cooker is performed as follows. First, the heating container 16 for toast is placed so that the convex portion 16c at the bottom is pushed into the concave portion on the top plate 4. Next, the hook 20 is removed, and the upper container 16a is lifted by the handle 19 to remove the bread 1
0 is placed on the pedestal 18 and the upper container 16a is closed.
At this time, the upper metal plate 7 comes into contact with the upper surface of the pan 10. Then, the toast heating key on the operation unit 3 is pressed. When the toast heating key is pressed, the inverter circuit 2
Is driven and a high frequency current is supplied to the heating coil 1 for a predetermined time. At this time, the bottom metal plate 17 is induction-heated by the high-frequency magnetic flux generated from the heating coil 1. At the same time, a part of high-frequency magnetic flux that does not interlink with the bottom metal plate 17 is generated by the top metal plate 7.
And the upper metal plate 7 is also induction-heated. Similar to the first embodiment, the bread 1 is also used in this embodiment.
The bottom surface of 0 is not directly heated by the bottom metal plate 17, but
The upper surface of the pan 10 is separated by an interval such that the temperature rise of the atmosphere on the lower surface of the pan 10 is the same as the temperature rise of the upper metal plate 7, and the bottom metal plate 17 heats with radiant heat. Here, since the bottom metal plate 17 is thick and has a large heat capacity, the bottom metal plate 1
The temperature rise of No. 7 is not faster than in the case of the first embodiment, and the distance between the bottom metal plate 17 and the lower surface of the pan 10 can be made shorter than that of the first embodiment. Along with this, the distance between the upper metal plate 7 and the heating coil 1 becomes shorter, and the temperature rise of the upper metal plate 7 becomes faster accordingly. Therefore, as shown in FIG. 7, the temperature rise of the upper metal plate 7, that is, the temperature rise of the upper surface of the pan 10 and the temperature rise of the lower surface of the pan 10 are substantially the same, and it is possible to heat the upper and lower surfaces of the pan 10 at the same time evenly. Become. In addition to this, the heating time t ₂ can be made shorter than that in the first embodiment. Further, in the present embodiment, the upper metal plate 7 is configured to be slidable in the vertical direction, so that the pan 1
Even if the thickness of 0 is increased from the thickness of the cut into eight, the upper and lower surfaces of the bread 10 can be heated uniformly at the same time.

8 to 10 show a third embodiment of the present invention. Bread is delicious when the surface is heated quickly. Therefore, the present embodiment is configured to accelerate the bread heating. FIG. 8 is a cross-sectional view of the heating container for toasts, and FIG. 9 is a perspective view of the heating container for toasts with the upper container portion opened. 8 and 9,
Reference numeral 26 denotes a toast heating container made of a non-metal non-magnetic material, which completely covers the upper metal plate 32 and the bottom metal plates 27, 31. Similar to the second embodiment, the toast heating container 26 includes an upper container part 26 a having an upper metal plate 32 and a lower container part 26 having bottom metal plates 27, 31.
It is divided into two of b. 26c is a convex portion, which has the same function as described above. The bottom metal plate is composed of two ring-shaped metal plates 27 and 31. Also the upper metal plate 3
Reference numeral 2 has a diameter similar to that of the heating coil 1 and has side plates in a petri dish. 30 is a columnar magnetic material having a high magnetic permeability installed at the center of the bottom of the heating container 26 for toast, 29 is a heat transfer adjusting plate such as ceramic having good heat conduction from the bottom metal plates 27, 31, and 28 is heat transfer. Adjusting plate 29 to lower container 26
It is a pressing portion that is fixed by pressing on b.

With such a structure, toast making with an electromagnetic cooker is performed as follows. First, the heating container 26 for toast is placed so that the convex portion 26c at the bottom is pushed into the concave portion on the top plate 4. Next, the hook 20 is removed, and the upper container portion 26a is lifted by the handle 19 to remove the bread 1
0 is placed on the heat transfer adjusting plate 29, and the upper container portion 26a is closed. At this time, the upper metal plate 32 comes into contact with the upper surface of the pan 10. Then, the toast heating key on the operation unit 3 is pressed. When the toast heating key is pressed, the inverter circuit 2 is driven and the high frequency current is supplied to the heating coil 1 for a predetermined time. At this time, the bottom metal plates 27 and 31 are induction-heated by the high-frequency magnetic flux generated from the heating coil 1.
At the same time, a part of the high-frequency magnetic flux that does not link to the bottom metal plates 27 and 31 reaches the upper metal plate 32, and the upper metal plate 32 is also induction-heated. In the present embodiment, the high frequency magnetic flux is larger than that in the first and second embodiments, and the upper metal plate 32 is
It is configured to reach. That is, the bottom metal plate 27,
31 is formed into two rings so that high-frequency magnetic flux leaks to the upper metal plate 32 between them, and a cylindrical high-permeability magnetic flux near the center of the heating coil 1 reaches the upper metal plate 32 as much as possible. The magnetic material 30 having magnetic susceptibility is installed in the center of the bottom of the heating container 26 for toast, and the upper metal plate 32
A side plate is attached to the upper metal plate 32 in conformity with the shape of the heating coil 1 so that the magnetic path of the upper metal plate 32 can be easily formed. With these, as shown in FIG. Heating time t as compared with the first and second embodiments
₃ becomes shorter. However, the temperature rise of the bottom metal plates 27, 31 also becomes faster as the heat capacity becomes smaller, so the influence thereof is suppressed by the heat transfer adjusting plate 29 located thereabove. That is, the temperature of the heat transfer adjusting plate 29 rises in the same manner as the temperature of the upper metal plate 32 while receiving the radiant heat from the bottom metal plates 27 and 31. As a result, the upper and lower surfaces of the pan 10 can be heated uniformly at the same time. Moreover, since the heat transfer adjusting plate 29 has a good heat transfer property, the temperature distribution in the lateral direction becomes uniform, and the lower surface of the pan 10 can be heated uniformly.

Although each of the embodiments has been described as a method of heating the upper metal plate in contact with the upper surface of the pan, the upper metal plate is slightly separated from the upper surface of the pan and the upper surface of the pan is heated by radiant heat. It goes without saying that you can do it.

[0027]

As described above, according to the invention described in claim 1, there is provided a heating container having a bottom metal plate and an upper metal plate, and the heating container is provided with a heating coil on the lower surface side. Placed on the top plate, the induction heating of the bottom metal plate and the top metal plate at the same time by the high-frequency magnetic field from the heating coil, the object to be heated placed between the bottom metal plate and the top metal plate An electromagnetic cooker for heating, wherein the heating container is provided with a uniform heating means for heating the upper and lower surfaces of the object to be heated evenly, so that the upper and lower surfaces of the object to be heated, such as bread, are heated uniformly at the same time. Further, since the bottom metal is plate-shaped, the temperature distribution of the bottom metal plate is more uniform than in the conventional case, and the lower surface of the bread or the like to be heated can be uniformly heated. .

According to the second aspect of the present invention, the uniform heating means makes the distance between the object to be heated and the bottom metal plate a predetermined amount larger than the distance between the object to be heated and the upper metal plate. With the above structure, the lower surface of the object to be heated and the bottom metal plate are separated at a predetermined interval such that the temperature rise of the atmosphere on the lower surface of the bread or the like that is the object to be heated becomes substantially the same as the temperature rise of the upper metal plate, By heating the lower surface of the object to be heated with radiant heat from the bottom metal plate, the temperature increase of the upper metal plate, that is, the upper surface of the object to be heated and the temperature increase of the lower surface of the object to be heated can be made substantially the same.
The upper and lower surfaces of the bread or the like that is the object to be heated can be heated uniformly at the same time.

According to the third aspect of the present invention, the heat capacity of the bottom metal plate is made larger than that of the upper metal plate, so that the temperature rising speed of the bottom metal plate becomes slower and the upper metal plate, that is, the heated object is heated. It is possible to further reduce the distance between the lower surface of the object to be heated and the bottom metal plate in order to make the temperature increase on the upper surface of the object substantially equal to the temperature increase on the lower surface of the object to be heated. As a result,
Since the distance between the upper metal plate and the heating coil is reduced by the reduced distance, the heating finishing time can be shortened.

According to the invention of claim 4, a heat transfer adjusting plate for receiving radiant heat from the bottom metal plate is installed above the bottom metal plate, and a heat transfer adjusting plate is provided between the heat transfer adjusting plate and the upper metal plate. Since the object to be heated is placed on the heat transfer adjusting plate, the heat transfer adjusting plate has a good heat transfer property, so that the temperature distribution in the horizontal direction becomes uniform and the lower surface of the object to be heated such as a pan is heated more evenly. can do.

According to the fifth aspect of the present invention, since the bottom metal plate is formed in a ring shape, the high frequency magnetic flux from the heating coil easily leaks to reach the upper metal plate more and shorten the heating finishing time. be able to.

According to the sixth aspect of the present invention, since the magnetic material having a high magnetic permeability is installed in the central portion of the bottom of the heating container, a large amount of high frequency magnetic flux near the center of the heating coil reaches the upper metal plate, and the heating finish is achieved. The time can be further shortened.

According to the invention as set forth in claim 7, since the side plate is attached to the upper metal plate toward the inside of the heating container, a magnetic path is easily formed in the upper metal plate, and the high frequency magnetic flux from the heating coil is further increased. A large amount can be reached and the heating finishing time can be shortened.

According to the invention of claim 8, since the heating container is made of a non-metallic material and accommodated so as to cover the bottom metal plate and the top metal plate, there is no possibility of being burned during the heat treatment. And safety can be obtained.

According to the ninth aspect of the present invention, a ring-shaped bottom metal plate, a high-permeability magnetic material installed in the center of the bottom, an upper metal plate with side plates, and an upper part of the bottom metal plate. And a heat transfer adjusting plate for receiving radiant heat from the bottom metal plate are housed in a heating container made of a non-metallic material, and the heating container is placed on a top plate having a heating coil arranged on the lower surface side. However, since it is configured to heat the object to be heated placed between the heat transfer adjusting plate and the upper metal plate by induction heating the bottom metal plate and the upper metal plate at the same time with the high-frequency magnetic field from the heating coil, The high-frequency magnetic flux from the heating coil easily leaks to the upper metal plate side, and a magnetic path is easily formed in the upper metal plate, and the high-frequency magnetic flux reaches the upper metal plate more, while the bottom metal plate becomes a ring shape. As the heat capacity decreases, Even if there is a tendency for the temperature to rise even faster, the effect is suppressed by the heat transfer adjustment plate, and the temperature rise of the upper metal plate, that is, the upper surface of the object to be heated and the lower surface of the object to be heated become approximately the same It is possible to heat the upper and lower surfaces of the bread or the like, which is an object, simultaneously at the same time in a short time.
Further, since the heat transfer adjusting plate has a good heat transfer property, the temperature distribution in the lateral direction becomes uniform, so that the lower surface of the bread or the like which is the object to be heated can be heated more uniformly.

According to the tenth aspect of the present invention, since the upper metal plate is configured to be slidable in the vertical direction, it is possible to appropriately cope with this even if the thickness of the bread or the like to be heated changes. it can.

According to the eleventh aspect of the invention, since the heating container is provided with the vent hole, gas such as steam generated during the heating of the object to be heated escapes to the outside, so that safety can be obtained.

According to the twelfth aspect of the present invention, the aligning means for aligning the center of the heating container with the center of the heating coil when the heating container is placed on the top plate is provided on the top plate. Therefore, a large amount of high-frequency magnetic flux from the heating coil reaches the bottom metal plate and the top metal plate, and these metal plates can be efficiently heated.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a first embodiment of an electromagnetic cooker according to the present invention in a cross section of a heating container.

FIG. 2 is a perspective view showing the heating container according to the first embodiment with an upper metal plate opened.

FIG. 3 is a diagram showing temperature rising characteristics of an upper metal plate, a lower surface of an object to be heated, and the like in the first embodiment.

FIG. 4 is a configuration diagram showing a cross section of a portion of a heating container according to a second embodiment of the present invention.

FIG. 5 is a perspective view showing the heating container according to the second embodiment with an upper container portion opened.

6 is an enlarged view of an instruction piece portion in FIG. 4 described above.

FIG. 7 is a diagram showing a temperature rise characteristic of an upper metal plate, a lower surface of an object to be heated and the like in the second embodiment.

FIG. 8 is a configuration diagram showing a cross section of a portion of a heating container according to a third embodiment of the present invention.

FIG. 9 is a perspective view showing the heating container according to the third embodiment with an upper container portion opened.

FIG. 10 is a diagram showing temperature rise characteristics of an upper metal plate, a heat transfer adjusting plate and the like in the third embodiment.

FIG. 11 is a configuration diagram showing a cross section of a portion of a heating container of a conventional electromagnetic cooker.

FIG. 12 is a perspective view showing the heating container in the above conventional example in a state where the upper metal is opened.

FIG. 13 is a diagram showing temperature rise characteristics of a bottom metal and an upper metal in the above conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heating coil 4 Top plate 7 Upper metal plate 10 Bread (object to be heated) 11,16,26 Toast heating container 13 Bottom metal plate 15 Hook type line (matching means) 16a, 26a Upper container part 16b, 26b Lower container part 16c, 26c Convex part (matching means) 17 Bottom metal plate with large heat capacity 23 Venting holes 27, 31 Ring-shaped bottom metal plate 29 Heat transfer adjusting plate 30 High magnetic permeability magnetic substance 32 Top metal plate with side plate

Claims (12)

[Claims] 1. A heating container provided with a bottom metal plate and an upper metal plate, the heating container being placed on a top plate having a heating coil arranged on the lower surface side, and a high frequency wave from the heating coil is placed. An induction cooker for simultaneously inductively heating the bottom metal plate and the top metal plate with a magnetic field to heat an object to be heated placed between the bottom metal plate and the top metal plate, wherein An electromagnetic cooker comprising uniform heating means for heating the upper and lower surfaces of a heated object evenly. 2. The uniform heating means has a structure in which the distance between the object to be heated and the bottom metal plate is larger than the distance between the object to be heated and the upper metal plate by a predetermined amount. The electromagnetic cooker according to claim 1. 3. The electromagnetic cooker according to claim 2, wherein the heat capacity of the bottom metal plate is larger than that of the upper metal plate. 4. A heat transfer adjusting plate that receives radiant heat from the bottom metal plate is installed above the bottom metal plate, and the object to be heated is placed between the heat transfer adjusting plate and the upper metal plate. The electromagnetic cooker according to claim 2, wherein the electromagnetic cooker is configured as follows. 5. The electromagnetic cooker according to claim 2, wherein the bottom metal plate is formed in a ring shape. 6. The electromagnetic cooker according to claim 5, wherein a magnetic material having a high magnetic permeability is installed in the center of the bottom of the heating container. 7. The electromagnetic cooker according to claim 2, wherein a side plate is attached to the upper metal plate toward the inside of the heating container. 8. The electromagnetic cooker according to claim 1, wherein the heating container is made of a non-metallic material and accommodated so as to cover the bottom metal plate and the top metal plate. 9. A ring-shaped bottom metal plate, a high-permeability magnetic material installed in the center of the bottom, an upper metal plate with side plates, and a bottom metal plate installed above the bottom metal plate. The heat transfer adjusting plate for receiving the radiant heat of is housed in a heating container made of a non-metallic material, and the heating container is placed on a top plate on which a heating coil is arranged on the lower surface side, and the high frequency from the heating coil is placed. Electromagnetic cooking, characterized in that the bottom metal plate and the upper metal plate are simultaneously induction-heated by a magnetic field to heat an object to be heated placed between the heat transfer adjusting plate and the upper metal plate. vessel. 10. The electromagnetic cooker according to claim 1, wherein the upper metal plate is configured to be slidable in the vertical direction. 11. The induction cooker according to claim 8, wherein the heating container is provided with a vent hole. 12. The aligning means for aligning the center of the heating container with the center of the heating coil when the heating container is placed on the top plate is provided on the top plate. The electromagnetic cooker according to Item 1 or 9.