JPH09148059A - Induction heating cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooker having low cost, the free external design, and excellent stability in placing cooking pans and pots without using any expensive and ceramic glass-made top plate by constituting an induction heating cooker by a specified top plate, a Japanese burner grate, etc. SOLUTION: A resin-made top plate 11, an induction heating coil 12 provided under the top plate 11, and a Japanese burner grate 18 for placing a pan, and embedded in the top plate 11 are provided, the burner grate 18 is projected upward from the upper surface of the top plate 11 and arranged in the position facing the induction heating coil 12. The burner grate 18 is constituted of a metallic member having the large heat conductivity, and a temperature detecting device 19 for detecting the temperature of cooking pans and pots is preferably provided on the lower surface of it.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a top plate of an induction heating cooker which has a cooking pot placed on its upper surface for use.

[0002]

2. Description of the Related Art Conventionally, a pan-mounting plate consisting of a flat plate on the upper surface
Induction heating cookers with
Since a high-temperature cooking pot is placed on the tray, a flat plate of ceramic glass is often used because it has high heat resistance and is resistant to scratches and dirt during use.

FIG. 7 shows a specific structure of a conventional induction heating cooker. Reference numeral 1 is a pot mounting plate made of a flat plate of ceramic glass, 2 is a main body case made of resin, 3 is a heating unit including an induction heating coil placed below the pot mounting plate, and 4 is a main body. It is a bottom plate. Here, the pot mounting plate 1 has a temperature detecting element 5 on its lower surface,
The peripheral edge is adhered and fixed to the main body case with a silicone adhesive or the like. 6 is a cooking pot.

[0004]

However, the conventional induction heating cooker described above has the following problems. That is,
Since the flat plate 1 of ceramic glass is high in cost and is a glass plate, it is difficult to form a free shape, which has been a big problem in designing the shape of the exterior of the cooker.
Further, in the case of the conventional ceramic glass flat plate 1, if the center of the cooking pot 6 becomes hot and bends to the outside, there is a concern that point contact may occur and the cooking pot 6 may rotate or slide down. It has been a problem to improve safety when cooking with high temperature oil such as tempura cooking and when stirring foods in a pan such as okonomiyaki with a cooking iron. Further, in the case of the ceramic glass flat plate 1, a certain thickness (about 3 mm or more) was required in order to mount the cooking pot 6 on the strength.
Therefore, when a temperature detecting device for controlling the temperature of the food to be cooked is provided, this flat plate 1 of ceramic glass is used.
However, it is difficult to achieve accurate detection due to indirect detection.

The present invention solves the above-mentioned conventional problems, and can provide an inexpensive and free exterior design without using an expensive ceramic glass top plate for placing a cooking pot. In addition, it is an object of the present invention to realize a highly safe top plate configuration of an induction heating cooker that prevents slipping of a cooking pot and prevents slipping.

[0006]

[Means for Solving the Problems] Means of the present invention for solving the above-mentioned problems include a resin top plate, an induction heating coil below the resin top plate, and a drive for driving the induction heating coil. A circuit is provided, and the resin-made top plate is embedded with a metal-made material such as a pot-mounting metal projecting above the upper surface of the resin-made top plate at a position facing the induction heating coil. .

The second means is that the Gotok embedded in the resin top plate is made of a metal or the like having a large thermal conductivity, and the temperature of the cooking pot is detected on the lower surface of the Gotok. That is, the temperature detection device is provided.

[0008] The third means is that a temperature detecting device is provided in the center of the inside of the gotok arranged radially on the resin top plate, in which the surface of the heat receiving plate is set lower than the height of the gotok. That is, it is formed so as to project upward from the resin top plate.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 does not use an expensive ceramic glass top plate as a top plate of a cooking pot, but uses an inexpensive resin top plate and a metal-made gotoku. It is provided in combination with a glass-made top plate to provide an induction heating cooker top plate that can provide a free exterior design by molding. In the case of a conventional ceramic glass flat plate, if the center of the cooking pot gets hot and bends to the outside, there is a risk of point contact, causing the cooking pot to rotate and slipping down, but the cooking pot is made of metal. Since it is placed on top of the hot pot, the stability is increased. Therefore, it is possible to prevent burns due to high temperature oil etc. during tempura and the movement of the cooking pot when operating the iron for cooking, and a highly safe cooker Can be provided.

According to the second aspect of the present invention, the temperature detection of the cooking pot, which has been conventionally performed through the ceramic glass, is performed through the large metal heat transfer conductive metal alloy so that the temperature detection accuracy and the responsiveness can be improved. The present invention provides an induction heating cooker having a high-performance temperature detecting device, which is not possible with the conventional induction heating cooker, by realizing a temperature detecting means capable of dramatically improving the temperature. Especially in the case of metal gotok, unlike the flat ceramic glass flat plate, even if the pan bottom is warped,
Since the bottom of the pan always contacts the hot pot, temperature detection becomes more reliable.

According to the third aspect of the invention, the temperature detection accuracy is improved because the temperature detection device is exposed on the surface of the top plate as compared with the conventional temperature detection through the ceramic glass of the flat plate. Particularly, in the conventional ceramic glass top plate, since the placing surface of the cooking pot is the surface of the ceramic glass, not only the temperature at the center of the bottom but also the temperature influence from the grounding surface of the cooking pot is affected. Therefore, in the case of a sled cooking pot or the like, there is a problem that the detected temperature changes if the ground contact surface is different. However, in the case of this configuration, the cooking pot is placed on the solid state, and the temperature of the ground plane does not conduct to the temperature detection unit in the center. And since only the average temperature of the center of the cooking pot can be detected, even if the temperature of the cooking pot locally drops or rises, the detected temperature does not vary.
Further, since the height of the temperature detecting device is set lower than the height of the metal plate, the bottom of the pan does not run on the temperature detecting device and rotate. This means that when cooking tempura, etc., the placement of the cooking pot becomes unstable and it slips off the cooker.
It has the function of preventing unsafety. Since the height of the temperature detecting device is set lower than that of the glass made of metal, the bottom of the pot does not run on the temperature detecting device and rotate. This has the effect of preventing the cooking pan from becoming unstable and sliding down from the cooker to become unsafe during tempura cooking and the like.

Further, when the temperature detecting devices are provided at two positions, that is, the bottom surface and the central portion of the metal member, the disadvantages of the individual temperature detecting devices can be compensated, and higher temperature detecting accuracy can be realized. it can. That is, when placed in a temperature detecting device provided at the bottom of the metal plate, the heat conduction with the bottom of the pot is improved, but the temperature of the bottom of the pot varies. However, the temperature can be corrected by using the temperature detecting device in the central portion together. Further, by providing the two temperature detecting devices, it is possible to detect the presence or absence of the warp of the cooking pot and adjust the temperature according to the state of the warp. That is, when the bottom of the pan has a large warp, the central part goes upward, and the distance to the temperature detecting device in the central part increases, the temperature rise decreases, and the temperature difference with the temperature detecting device placed on the metal part is large. Therefore, by comparing the two, it is possible to know whether or not the cooking pot has a warp. If the level of the sledge of the cooking pot is known, the temperature correction can be performed more appropriately.
This makes it possible to reliably prevent oil ignition and the like even when a small amount of oil is used in tempura dishes and the like even in a sleigh cooking pot.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. (Embodiment 1) A first embodiment of the present invention will be described with reference to FIGS. In the figure, reference numeral 10 denotes a heating cooker main body, and a resin top plate 11 and a heating unit 14 including an induction heating coil 12 and a drive circuit unit 13 are configured below the resin top plate 11. . The resin top plate 1
Reference numeral 1 is made of a heat resistant resin such as silicone resin. Fifteen
Is a bottom plate of the main body that fits with the resin top plate 11 and supports the heating portion 14. In the central portion of the resin-made top plate 11, a gotoku 18 formed of a hard material such as metal is radially embedded at a position facing the induction heating coil 12, and its upper surface is made of the resin. It projects above the upper surface of the top plate 11. Reference numeral 17 denotes a metal cooking pot placed on the above-mentioned Gotoku 18.

In the above structure, when the high frequency current supplied from the drive circuit 13 flows through the induction heating coil 12,
Magnetic lines of force are generated from the induction heating coil 12, penetrate the resin-made top plate 11, and heat the bottom surface of the cooking pot 17 placed above. At this time, since the cooking pot 17 is placed on the gotoku 18 and does not directly contact the resin top plate 11, it is not damaged by the pot bottom 17a of the cooking pot or the like. Further, since the high-temperature cooking pot 17 does not directly contact the resin top plate 11, it does not require heat resistance as high as that of ceramic glass. This is different from other cookers, for example, cookers in which the heater part of the main body such as an electric heating stove produces heat,
It can be realized only by taking advantage of the characteristic of the induction heating cooker in which the heating part such as the induction heating coil itself does not generate heat but the cooking pot itself outside the main body generates heat. Further, since the top plate of the induction heating cooker main body 10 is constituted by the combination of the metal-made profitable material 18 and the resin top plate 11, a flat plate plate of ceramic glass made of a conventional flat plate is used. Since it is a resin top plate,
Since the outer shape can be freely formed and can be molded integrally with the outer case of the main body, the number of parts can be reduced, and the work of bonding and fixing the conventional ceramic glass and the outer case is unnecessary. Therefore, since the outer shape is easy and the expensive ceramic glass top plate is not used, it is possible to provide a top plate of an inexpensive induction heating cooker.

Further, in the case of a conventional ceramic glass flat plate, if the center of the cooking pot becomes hot and bends outward, there is a concern that point contact may occur and the cooking pot 17 may rotate and slide down. The cooking pot 17 has a plurality of benefits
Since it is placed on top of 8, the single point contact does not occur and stable placement is possible. Therefore, it is possible to prevent the cooking pot 17 from moving when operating hot oil or the like during tempura, and to provide a highly safe cooking device.

In the present embodiment, the alloy 18 is made of metal such as aluminum or copper, but it is more heat resistant than resin,
Non-metals such as ceramics and pottery may be used as long as they are hard and scratch resistant materials.

(Second Embodiment) A second embodiment of the present invention will be described with reference to FIGS. In FIG. 3, a temperature detecting element 19 composed of a thermistor or the like is tightly held by a temperature detecting support body 20 under a metal heat sink 18 having a large thermal conductivity embedded in a resin top plate 11. The temperature detecting element 19 is the driving circuit 13
The output of the temperature detecting element 19 controls the energization of the induction heating coil 12. The temperature detecting element 19 is connected to a predetermined location of the plurality of metallic gotoku 18 as required.

In the above structure, when the high frequency current supplied from the drive circuit 13 flows through the induction heating coil 12, magnetic lines of force are generated from the induction heating coil 12 and penetrate the resin top plate 11, Cooking pan 17 placed above
Heat the bottom of the. The temperature of the bottom 17a of the pot is transmitted to the temperature detecting element 19 placed below through the metal plate 18, and the output corresponding to each temperature is sent to the drive circuit. If there is food such as water inside the cooking pot 17, the pot bottom 17
The temperature of a also becomes a temperature corresponding to it, and by detecting this temperature, it is possible to detect an empty pot, oil temperature, boiling of water, and the like. By controlling energization to the induction heating coil 12 in accordance with the output from the temperature detecting element 19, the oil temperature during tempura can be stabilized at a predetermined oil temperature, and overheating can be prevented to improve safety. Can be done. In particular, by detecting the temperature of the cooking pot 17 which has been performed through the conventional ceramic glass through the metal heater 18 having a large thermal conductivity, the temperature detection accuracy can be dramatically improved.
The thermal conductivity of ceramic glass is 0.0048 cal / c
m, s, ° C, and the thermal conductivity of metals such as aluminum and copper has a difference of about 100 times at 0.53 to 0.94 cal / cm, s, ° C. This difference is temperature detection accuracy and responsiveness. Greatly affect the. Therefore, with this configuration, it is possible to provide an induction heating cooker having a high-performance temperature detecting device, which was not possible with the conventional induction heating cooker using the ceramic glass for the top plate.

(Embodiment 3) A third embodiment of the present invention will be described with reference to FIGS. In FIG. 3, a central temperature detecting device 2 including a metallic heat receiving plate 22 having a temperature detecting element 21 enclosed therein is provided at the inner central portion of a metallic plate 18 radially arranged on a resin top plate 11.
3 are configured. Here, the heat receiving plate 22 is exposed above the top plate 11 made of resin, and its upper surface is set lower than the height of the metal plate 18.

In the above structure, the temperature at the center of the pan bottom 17a is directly transmitted to the temperature detecting element 21 via the heat receiving plate 22 made of metal, and the temperature detection output is input to the drive circuit 13. In such a configuration, as compared with the conventional temperature detection through the flat plate ceramic glass, the central temperature detection device 2
Since 3 is exposed on the surface of the resin-made top plate 11, the temperature detection accuracy is improved. In particular, in the conventional ceramic glass top plate, since the placing surface of the cooking pot 17 is the surface of the ceramic glass, not only the temperature at the center of the pot bottom but also the temperature influence from the grounding surface of the cooking pot 17 is affected. It was Therefore, in the case of a sled cooking pot or the like, there is a problem that the detected temperature changes if the ground contact surface is different. However, in the case of this configuration, the cooking pot is placed on the metal plate 18, and the temperature of the ground surface is not conducted to the central temperature detecting device 23. Since only the average temperature in the center of the cooking pot 17 can be detected, the detected temperature does not fluctuate even if the temperature of the cooking pot 17 locally drops or rises. Further, since the height of the central temperature detecting device 23 is lower than the height of the metal plate 18, the bottom of the pan is located at the central temperature detecting device 2.
It does not run on the heat receiving plate 22 of No. 3 and rotate. This also has the effect of preventing the cooking pan 17 from becoming unstable when it is cooked with tempura or the like and slipping out of the cooking device and becoming unsafe.

(Fourth Embodiment) A fourth embodiment of the present invention will be described with reference to FIGS. A temperature detecting device 20 in which a temperature detecting element 19 is enclosed is closely attached to the lower surface of a plurality of metallic gotoku 18 radially embedded in a resin top plate 11, and the inside of the metallic gotoku 18 is sealed. A central temperature detecting device 23 is formed in the central part, which is composed of a metal heat receiving plate 22 in which a temperature detecting element 21 is enclosed. The upper surface of the metal heat receiving plate 21 of the central temperature detecting device 22 is formed to be lower than the height of the metal plate 18 and projected from the resin top plate 11.

In the above structure, the temperature detecting devices are provided at the two positions of the lower surface and the central portion of the plurality of metal belts 18, thereby compensating for the drawback of being able to be placed in each of the individual temperature detecting devices, and providing a higher temperature. It is possible to realize accurate temperature detection accuracy. That is, in the temperature detecting device 20 provided below the metal plate 18, the thermal conductivity with the pot bottom 17a is improved, but the pot bottom temperature varies. However, the temperature can be corrected by using the central temperature detecting device 23 in the central portion together. That is, the metal 1
By averaging the output from the temperature detecting element 19 arranged in the lower part of 8 and the output from the temperature detecting element 21 in the central part, the temperature distribution of the entire pan bottom can be averaged and output to the drive circuit 13. By controlling the energization, the temperature variation due to the ubiquity of the cooked food can be reduced as compared with the control from the output from the single temperature detection device. Further, by providing two kinds of temperature detecting devices at the central portion and the peripheral portion of the bottom of the pot, it becomes possible to detect the presence or absence of the pot sled and adjust the temperature according to the state. That is, the warp of the bottom of the pan is large, the central portion is upward, and the distance between the central portion and the central temperature detecting device 23 is large, the temperature rise is small,
Since the temperature difference with the temperature detection device 20 placed on the metal plate 18 becomes large, by comparing the two,
The presence or absence of a sled of the cooking pot 17 can be known. Cooking pot 17
If the level of the pot sled is known, the temperature of the temperature detection output can be corrected and the temperature can be properly detected. That is,
If the temperature of the central part and the temperature of the peripheral part are extremely different, it is judged that the pot sled is large, and it is judged that the temperature of the central part is different from the actual temperature, and the temperature of the central part is raised accordingly. Therefore, the temperature can be corrected.

[0023]

As described above, according to the invention of claim 1, an inexpensive resin top plate and a metal top plate are used without using an expensive ceramic glass top plate for the cooking pot. It is possible to provide a top plate of an induction heating cooker that can provide a free exterior design by performing a molding process unlike the glass top plate, and the cooking pot is placed on top of multiple gotok. Since it is placed, in the case of a conventional ceramic glass flat plate, the problem that the cooking pot makes a point contact due to the outer sled of the cooking pot and the cooking pot rotates or slides down, and the stability of the placement of the cooking pot is improved. You can

According to the second aspect of the present invention, the temperature detection of the cooking pot, which has been conventionally performed through the ceramic glass, is performed through the metal heater having a large thermal conductivity to detect the temperature. It is possible to provide a temperature detecting means capable of dramatically improving accuracy and responsiveness, and to provide an induction heating cooker having a high-performance temperature detecting device which is impossible with the conventional induction heating cooker. In particular, in the case of a metal gotok, unlike a flat ceramic glass flat plate, even if the pot bottom is uneven, the metal bottom is always in contact with the pot so that the temperature detection becomes more reliable.

According to the third aspect of the invention, the temperature detecting device is exposed on the surface of the top plate as compared with the conventional temperature detection through the ceramic glass of the flat plate, so that the temperature detecting accuracy is improved. Especially in the conventional ceramic glass top plate, since the placing surface of the cooking pot is the surface of the ceramic glass, not only the temperature at the center of the pot bottom but also the temperature effect from the grounding surface of the cooking pot is affected. There was a problem that the detection temperature changed if the grounding surface was different in the case of a pot, but by placing the cooking pan on a metal plate, the temperature of the grounding surface could not be conducted to the central temperature detection part. Since only the average temperature in the center of the cooking pot is detected, it is possible to prevent temperature variations depending on the mounting location, such as when a temperature detection device is installed below the metal gutok, Accuracy is improved. Further, since the height of the temperature detecting device is lower than the height of the metal plate, the bottom of the pot does not ride on the temperature detecting device and rotate. This has the effect of preventing the cooking pan from becoming unstable and sliding down from the cooker to become unsafe during tempura cooking and the like.

Further, if the temperature detecting devices are provided at two positions, that is, the bottom surface and the central portion of the metallic member, the disadvantages of the individual temperature detecting devices can be compensated, and higher temperature detecting accuracy can be realized. That is, when placed on a temperature detecting device provided at the bottom of a metal bowl, the thermal conductivity with the bottom of the pot is improved, but the temperature of the bottom of the cooking pot varies. However, it is possible to correct the temperature by using the temperature detection device in the central part together, and it is possible to detect the presence or absence of a warp in the cooking pot and adjust the temperature according to the state of the warp. Become. If the level of the sledge of the cooking pot is known, the temperature can be corrected more appropriately according to the level of the sledge.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an induction heating cooker showing a first embodiment of the present invention.

FIG. 2 is a perspective view of the induction heating cooker.

FIG. 3 is a cross-sectional view of essential parts of an induction heating cooker showing a second embodiment of the present invention.

FIG. 4 is a cross-sectional view of a main part of an induction heating cooker showing a third embodiment of the present invention.

FIG. 5 is a perspective view of the induction cooking device.

FIG. 6 is a sectional view of an essential part of an induction heating cooker showing a fourth embodiment of the present invention.

FIG. 7 is a sectional view of a conventional induction heating cooker.

[Explanation of symbols]

 10 Heating Cooker Main Body 11 Resin Top Plate 12 Induction Heating Coil 13 Drive Circuit 17 Cooking Pan 18 Gotok 19 Temperature Detection Element 22 Heat Receiving Plate 23 Central Temperature Detection Device

Claims (3)

[Claims] 1. A top plate made of resin, an induction heating coil provided below the top plate made of resin, and a pot-mounting pot embedded in the top plate made of resin. The gotoku is an induction heating cooker that protrudes upward from the upper surface of a resin top plate and is arranged at a position facing the induction heating coil. 2. The induction heating cooker according to claim 1, wherein the gotok is made of a material having a large thermal conductivity such as metal, and a temperature detecting device for detecting the temperature of the cooking pot is arranged on the lower surface thereof. 3. The gotok are arranged radially, and a central temperature detecting device is provided at a central portion inside the gotok so as to project below a top surface of the gotok and above a resin top plate. The induction heating cooker according to 2.