JP2000156280A - Electromagnetic cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent move of a cooking container to be placed on a top plate, favorably conduct heating, and improve heating efficiency. SOLUTION: A number of ceramic beads 13 are provided on an upper surface of a top plate 10 disposed above an induction heat coil. In the upper surface of the top plate 10, the surface at a part where the ceramic beads 13 are provided becomes rough because of fine irregularities, so a cooking container placed on the top plate 10 becomes hard to slip. Even in heat-cooking using a non-magnetic cooking container of aluminum or the like, move of the cooking container can be prevented, thereby it can be heated with a large power. As a contact surface between the cooking container and the top plate 10 becomes small, heat of the cooking container is hard to be transmitted to the top plate 10, thereby heating efficiency is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic cooker having a top plate on which a cooking vessel is placed above an induction heating coil.

[0002]

An electromagnetic cooker is provided with a top plate disposed above an induction heating coil, and a high-frequency current is applied to the induction heating coil so that a metal cooker mounted on the top plate can be used. Induction heating is applied to a cooking vessel such as a pot.

[0003] However, the conventional top plate is
Since it is made of crystallized glass and has a smooth upper surface, if the main body of the electromagnetic cooker is slightly tilted, there is a problem that the cooking container placed on the top plate is slippery. In addition, particularly when heating and cooking using a non-magnetic material such as aluminum as the cooking container, the cooking container floats on the top plate due to repulsion, or moves,
Even if the main body was installed horizontally, it was not possible to heat with a large output, and it was necessary to lower the output and heat without ending.

Further, since the heat of the cooking vessel is easily transmitted to the top plate, the heating efficiency is reduced accordingly.

[0005] The present invention has been made in view of the above circumstances, and an object of the present invention is to prevent the movement of a cooking container placed on a top plate, thereby enabling good heating. An object of the present invention is to provide an electromagnetic cooker capable of improving heating efficiency.

[0006]

In order to achieve the above object, according to the first aspect of the present invention, a top plate on which a cooking vessel is placed is provided above an induction heating coil. It is characterized by providing a large number of ceramic beads.

[0007] According to the above means, the surface of the portion on which the ceramic beads are provided on the top plate is not smooth due to fine irregularities, and the cooking container placed on the top plate slides. It becomes difficult. Further, even when heating and cooking is performed using a non-magnetic cooking container such as aluminum, the movement of the cooking container can be prevented, so that heating can be performed with a large output. Furthermore, since the contact area between the cooking vessel and the top plate is reduced, the heat of the cooking vessel is less likely to be transmitted to the top plate, and the heating efficiency can be improved accordingly.

In this case, it is preferable to use a hollow ceramic bead (the invention of claim 2). According to this, since the heat insulating property by the ceramic beads is improved, the heat of the cooking vessel is less likely to be transmitted to the top plate side, and the heating efficiency of the cooking vessel can be further improved.

According to a third aspect of the present invention, the ceramic beads are:
It is characterized in that it is arranged on the upper surface of the top plate so as to correspond to a heating effective area effective to heat the cooking vessel. According to this, the position of the cooking container on the upper surface of the top plate can be easily understood, and the amount of ceramic beads used can be reduced.

According to a fourth aspect of the present invention, the ceramic beads are disposed on substantially the entire upper surface of the top plate, and on the upper surface of the top plate, a heating effective area for heating the cooking vessel and other heating ineffective areas are provided. It is characterized in that the particle size of the ceramic beads is different between the regions. According to this, on the upper surface of the top plate, the position where the cooking container is placed can be visually easily understood, and a step can be prevented from being formed between the heating effective area and the heating non-effective area. Further, heat insulation in the non-heating effective area can be secured.

According to a fifth aspect of the present invention, the ceramic beads are:
In the heating effective area effective for heating the cooking vessel on the upper surface of the top plate, it is characterized in that it is arranged in a plurality of radial lines centered on the center of the heating effective area, and claims. The invention of 7 is characterized in that the ceramic beads are arranged in a plurality of concentric circles centering on the center of the effective heating area in the effective heating area for heating the cooking vessel on the upper surface of the top plate. . According to these inventions, on the upper surface of the top plate,
The position where the cooking vessel is placed can be easily understood, and the amount of ceramic beads used can be reduced.

A sixth aspect of the present invention is characterized in that, in the fifth aspect of the present invention, at least one of the lines formed by the ceramic beads is arranged on the near side. When a cooking vessel with a handle on one side, such as a frying pan or a one-handed pot, is placed on a top plate for cooking, the cooking vessel is poorly balanced and easily moved. When such a cooking container is used, the cooking is usually performed with the handle on the front side, so that the center of gravity of the cooking container is on the front side. Thus, in the invention of claim 6, on the upper surface of the top plate,
By arranging at least one of the lines of the ceramic beads so as to be on the front side, the effect of the ceramic beads to prevent slipping is more effective.

[0013] In the invention according to claim 8, when a plurality of induction heating coils are provided, the ceramic beads are:
It is characterized in that it is arranged in an area corresponding to each of the induction heating coils and having a size corresponding to the output of the corresponding induction heating coil. According to this, by looking at the area of the ceramic beads, the position where the cooking vessel is placed and the magnitude of the output of the induction heating coil can be determined.

According to a ninth aspect of the present invention, when a temperature sensor for detecting the temperature of the bottom of the cooking vessel is provided on the lower surface side of the top plate, a portion corresponding to the upper part of the temperature sensor on the upper surface of the top plate. Is characterized in that the height of the ceramic beads is higher than the surroundings. According to this, the high part of the ceramic beads can be brought close to the bottom of the cooking vessel, and the temperature sensor can detect the temperature of the bottom of the cooking vessel well through the high part of the ceramic beads. Sensitivity can be improved.

A tenth aspect of the present invention is characterized in that the ceramic beads have a particle size of 10 to 90 μm.
According to this, the anti-slip effect and the heat insulating effect by the ceramic beads can be effectively exhibited.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. First, FIG. 3 is an exploded perspective view of the electromagnetic cooker. In FIG. 3, the main case 1 is configured by combining the lower case 2 and the upper case 3. In lower case 2 of these,
A display 4 and a switch 5 are disposed at the front, a control circuit 6 and an inverter circuit 7 are disposed at the rear, and an induction heating coil 8 is disposed at a substantially central portion above the inverter circuit 7 and the like. A fan device 9 for cooling the inside of the main body case 1 is provided at a corner.

The upper case 3 is mounted on the lower case 2 so as to cover the induction heating coil 8 and the like from above.
On top of the upper case 3, a disk-shaped top plate 10
Are positioned above the induction heating coil 8 and are bonded and fixed, for example, in a state sealed with silicon. The display 4 and the switch 5 are provided at the front of the upper case 3.
An operation panel 11 is provided corresponding to.

As shown in FIGS. 1 and 2, the top plate 10 is made of a crystallized glass 12 as a base material, and is provided with a number of granular ceramic beads 13 on its upper surface. In this case, ceramic beads 1
3 is a top plate 1 with a heat-resistant adhesive, for example.
By being applied to 0, it is arranged over the entire upper surface of the top plate 10. Each ceramic bead 1
3, which is not shown, has a hollow shape and has a particle size of 10 to 90 μm.

In the above configuration, when cooking by heating, a cooking vessel (not shown) such as a pot is placed on the top plate 10. At this time, since the ceramic beads 13 are provided on the upper surface of the top plate 10, the surface is not smooth due to fine irregularities, and the cooking container placed on the top plate 10 is less likely to slip. ing.

When the switch 5 is operated on the operation panel 11, a high-frequency current is applied to the induction heating coil 8 via the inverter circuit 7, and thereby the cooking vessel placed on the top plate 10 is induction-heated. . At this time, when a nonmagnetic material such as aluminum is used as the cooking container, the cooking container tends to float or move on the top plate 10 due to the repulsive force. Since the upper surface of 10 is not slippery and the movement of the cooking container can be prevented, it is possible to heat with a large output.

The upper surface of the top plate 10 has fine irregularities due to the ceramic beads 13, and the contact area between the top plate 10 and the cooking vessel placed thereon is reduced, so that the heat of the cooking vessel is reduced. Top plate 1
It becomes difficult to transmit to the 0 side, and the heating efficiency can be improved accordingly. Further, since a hollow ceramic bead 13 is used, the heat insulating property of the ceramic bead 13 is improved, and the heat of the cooking vessel is reduced by the top plate 10.
The heating efficiency of the cooking container can be further improved.

The ceramic beads 13 have a particle size of 1
The use of the ceramic beads 13 having a diameter of 0 to 90 μm enables the ceramic beads 13 to effectively exhibit the slip preventing effect and the heat insulating effect. Incidentally, when the particle size is smaller than 10 μm, the anti-slip effect and the heat insulating effect are reduced, and when the particle size is larger than 90 μm, the handleability and the like are reduced.

FIGS. 4 and 5 show a second embodiment of the present invention. The second embodiment has the following features. That is, the ceramic beads 13 are arranged only on the effective heating area 14 (the area corresponding to the induction heating coil 8) effective for heating the cooking vessel on the upper surface of the top plate 10, and the other ineffective heating area 15.
(The area deviating from the induction heating coil 8).

According to the second embodiment, on the upper surface of the top plate 10, the heating effective area 14 and the heating ineffective area 15 can be distinguished from each other, so that the user can easily understand the position of the cooking container. In addition, there is an advantage that the amount of the ceramic beads 13 used can be reduced.

FIGS. 6 and 7 show a third embodiment of the present invention. The third embodiment has the following features. That is, the ceramic beads 16a and 16b are arranged on almost the entire upper surface of the top plate 10. On the upper surface of the top plate 10, ceramic beads 16a of a heating effective area 14 effective for heating the cooking vessel are provided. The particle diameters of the other ceramic beads 16b in the non-heating effective area 15 are different. In this case, the diameter of the ceramic beads 16a in the heating effective area 14 is 20 to 30 μm, and the diameter of the ceramic beads 16b in the heating non-effective area 15 is smaller than 1 to 5 μm.

According to the third embodiment, the position of the cooking vessel on the upper surface of the top plate 10 can be easily understood, and no step can be formed between the effective heating area 14 and the ineffective heating area 15. Can be. Also,
Heat insulation in the heating non-effective area 15 can also be secured.

FIG. 8 shows a fourth embodiment of the present invention. This fourth embodiment has the following features. That is, on the upper surface of the top plate 10, the ceramic beads 13 are placed in a heating effective area 14 (see a two-dot chain line) effective for heating the cooking vessel.
Are arranged in three radial lines with the center O at the center.

According to the fourth embodiment, on the upper surface of the top plate 10, the position (the effective heating area 14) where the cooking container is placed can be easily understood by the line of the ceramic beads 13. Moreover, compared to the case where the ceramic beads 13 are arranged on the entire upper surface of the top plate 10, the use amount of the ceramic beads 13 can be reduced, and the anti-slip effect of the cooking container is high.

FIG. 9 shows a fifth embodiment of the present invention. This fifth embodiment differs from the above-described fourth embodiment in the following points. That is, on the upper surface of the top plate 10, one of the lines formed by the ceramic beads 13 is arranged on the near side (the operation panel 11 side).

When a cooking vessel 17 having a handle attached to one side, such as a frying pan or a one-handed pot, is placed on the top plate 10 for cooking, the cooking vessel 17 has a poor balance and is easy to move. When using such a cooking container 17,
Normally, since cooking is performed with the handle 17a on the near side (the operation panel 11 side), the center of gravity of the cooking container 17 is on the near side. Thus, in the fifth embodiment, the top plate 1
0, the top of the line by the ceramic beads 13
By arranging the book on the front side, there is an advantage that the effect of preventing slippage by the ceramic beads 13 becomes more effective.

FIG. 10 shows a sixth embodiment of the present invention. The sixth embodiment has the following features.
That is, on the upper surface of the top plate 10, the ceramic beads 13 are arranged in a plurality of concentric circles around the center O of the effective heating area 14 in the effective heating area 14 effective for heating the cooking vessel. . Sixth such
In this embodiment, the same operation and effect as those of the fourth embodiment can be obtained.

FIG. 11 shows a seventh embodiment of the present invention. The seventh embodiment has the following features.
In other words, it is intended that two induction heating coils having different outputs are provided below the top plate 18. The top plate 18 has a rectangular plate shape, and is arranged above two induction heating coils (not shown). On the upper surface of the top plate 18, the ceramic beads 13 are arranged in regions 19 and 20 (see dashed double-dotted lines) corresponding to each induction heating coil and having a size corresponding to the output of the corresponding induction heating coil. ing.

In this case, the maximum output of the induction heating coil disposed on the left side is set smaller than the maximum output of the induction heating coil disposed on the right side. Is set smaller than the area 20 of the ceramic beads 13 on the right side.
In this case, the left and right ceramic beads 13 are the fifth ceramic beads 13.
As in the embodiment, an area 1 effective for heating the cooking container
In regions 9 and 20, three regions are arranged radially around the centers O1 and O2 of the regions 19 and 20, respectively. According to such a seventh embodiment, the area 1 of the ceramic beads 13
By looking at 9 and 20, there is an advantage that the position of the cooking container and the output of the induction heating coil can be determined.

FIGS. 12 and 13 show an eighth embodiment of the present invention. The eighth embodiment has the following features. That is, on the lower surface of the top plate 10,
A temperature sensor 21 for detecting the temperature of the bottom of the cooking vessel placed on the top plate 10 is provided. This temperature sensor 21 is a holder 2 having good thermal conductivity.
The sensor element 21b is provided in 1a.
Then, on the upper surface of the top plate 10, a portion of the ceramic beads 1 corresponding to a portion above the temperature sensor 21 is provided.
3, the height H1 is higher than the height H2 of the surrounding ceramic beads 13 (H1> H2). The particle size of the ceramic beads 13 corresponding to the portion above the temperature sensor 21 is smaller than that of the surrounding ceramic beads 13.

According to the eighth embodiment, the convex portion 22 which is the high portion of the ceramic beads 13 can be brought close to the bottom of the cooking vessel, and the temperature sensor 21 can be connected to the cooking vessel via the convex portion 22. The temperature at the bottom can be detected well, and the sensitivity of the temperature sensor 22 can be improved.

[0036]

As is clear from the above description, according to the present invention, the following effects can be obtained. Claim 1
According to the electromagnetic cooker, on the upper surface of the top plate, the surface of the portion provided with the ceramic beads is not smooth due to fine irregularities, and the cooking container placed on the top plate is less likely to slip. . Further, even when heating and cooking is performed using a non-magnetic cooking container such as aluminum, the movement of the cooking container can be prevented, so that heating can be performed with a large output. Furthermore, since the contact area between the cooking vessel and the top plate is reduced, the heat of the cooking vessel is less likely to be transmitted to the top plate, and the heating efficiency can be improved accordingly.

According to the electromagnetic cooker of the second aspect, by using a hollow ceramic bead, the heat insulating property of the ceramic bead is improved, so that the heat of the cooking vessel is more difficult to be transmitted to the top plate side. The heating efficiency of the cooking container can be further improved.

According to the electromagnetic cooker of the third aspect, by arranging the ceramic beads on the upper surface of the top plate at a position corresponding to the effective heating area, the position of the cooking vessel on the upper surface of the top plate can be visually determined. It is easy to understand, and the amount of ceramic beads used can be reduced as compared with the case where ceramic beads are provided on the entire surface.
According to the electromagnetic cooker of the fourth aspect, on the upper surface of the top plate, the position where the cooking vessel is placed can be easily understood, and a step can be prevented from being formed between the effective heating area and the ineffective heating area. Heat insulation in the non-effective area can also be secured.

According to the electromagnetic cooker of the fifth and seventh aspects, the position of the cooking vessel on the upper surface of the top plate can be easily understood, and the amount of ceramic beads used can be reduced. According to the electromagnetic cooker of the sixth aspect, even when cooking is performed using a cooking container having a handle on one side, such as a frying pan or a one-handed pan, the effect of preventing slippage by the ceramic beads is effectively exerted. Become. According to the electromagnetic cooker of the eighth aspect, when a plurality of induction heating coils are provided, the position of the cooking vessel and the magnitude of the output of the induction heating coil can be determined by looking at the area of the ceramic beads.

According to the electromagnetic cooker of the present invention, when a temperature sensor for detecting the temperature of the bottom of the cooking vessel is provided on the lower surface side of the top plate, the high portion of the ceramic beads is placed on the bottom of the cooking vessel. This allows the temperature sensor to better detect the temperature at the bottom of the cooking vessel through the high portion of the ceramic beads, thereby improving the sensitivity of the temperature sensor. According to the electromagnetic cooker of claim 10, the particle size of the ceramic beads is 10 to 90.
When the thickness is set to μm, the anti-slip effect and the heat insulating effect of the ceramic beads can be effectively exhibited.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of the present invention.
-Enlarged sectional view along the X1 line

FIG. 2 is a perspective view of a top plate partially cut away.

FIG. 3 is an exploded perspective view of the electromagnetic cooker.

FIG. 4 is a perspective view of a top plate showing a second embodiment of the present invention.

FIG. 5 is an enlarged sectional view taken along line X2-X2 in FIG.

FIG. 6 is a view corresponding to FIG. 4, showing a third embodiment of the present invention.

FIG. 7 is an enlarged sectional view taken along line X3-X3 in FIG. 6;

FIG. 8 is a view corresponding to FIG. 4, showing a fourth embodiment of the present invention;

FIG. 9 is an overall perspective view showing a fifth embodiment of the present invention.

FIG. 10 is a view corresponding to FIG. 4, showing a sixth embodiment of the present invention;

FIG. 11 is a view corresponding to FIG. 4, showing a seventh embodiment of the present invention;

FIG. 12 is a view corresponding to FIG. 4, showing an eighth embodiment of the present invention;

13 is an enlarged sectional view taken along line X4-X4 in FIG.

[Explanation of symbols]

1 is a main body case, 8 is an induction heating coil, 10 is a top plate, 12 is crystallized glass, 13 is ceramic beads, 14 is a heating effective area, 15 is a heating non-effective area, 16
a and 16b are ceramic beads, 17 is a cooking vessel, 18
Denotes a top plate, 19 and 20 denote areas (effective heating areas), 21 denotes a temperature sensor, and 22 denotes a projection.

Claims (10)

[Claims] 1. An electromagnetic cooker comprising a top plate on which a cooking vessel is mounted above an induction heating coil, and a plurality of ceramic beads provided on an upper surface of the top plate. 2. The electromagnetic cooker according to claim 1, wherein the ceramic beads have a hollow shape. 3. The electromagnetic cooker according to claim 1, wherein the ceramic beads are arranged on an upper surface of the top plate so as to correspond to a heating effective area effective for heating the cooking vessel. 4. The ceramic beads are disposed on substantially the entire upper surface of the top plate. On the upper surface of the top plate, a ceramic bead having a heating effective area for heating the cooking vessel and a heating ineffective area other than the heating bead are provided. The electromagnetic cooker according to claim 1, wherein the particle size of the electromagnetic cooker is varied. 5. The method according to claim 5, wherein the ceramic beads are arranged in a heating effective area for heating the cooking vessel on an upper surface of the top plate, and are arranged in a plurality of radial lines around the center of the heating effective area. The electromagnetic cooker according to claim 1 or 2, wherein 6. The electromagnetic cooker according to claim 5, wherein at least one of the lines formed by the ceramic beads is arranged on the front side. 7. The ceramic beads are arranged in a plurality of concentric circles centering on the center of the effective heating region in the effective heating region for heating the cooking vessel on the upper surface of the top plate. The electromagnetic cooker according to claim 1. 8. A plurality of induction heating coils are provided, and the ceramic beads are arranged in a region corresponding to each of the induction heating coils and having a size corresponding to the output of the corresponding induction heating coil. The electromagnetic cooker according to any one of claims 5, 6, and 7. 9. A temperature sensor for detecting the temperature of the bottom of the cooking vessel is provided on the lower surface side of the top plate, and the height of the ceramic beads corresponding to the portion above the temperature sensor on the upper surface of the top plate is set higher than the surroundings. The electromagnetic cooker according to claim 1, wherein the height is increased. 10. The particle size of the ceramic beads is 10 to 9
The electromagnetic cooker according to any one of claims 1 to 9, wherein the thickness is 0 µm.