JPH0723919Y2 - Induction heating griddle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an induction heating griddle used for cooking food on a cooking iron plate.

[Prior Art] Conventionally, a griddle in which an iron plate for cooking is heated by a gas flame from its back surface is widely used. In the case of this griddle, the surface temperature distribution is made as uniform as possible against the heating from the back side of the iron plate due to the flame of gas of 500 to 600 ° C, and the heat storage property of the iron plate is further improved and the temperature drop of the iron plate during food feeding is reduced. A relatively thick iron plate is used to do this.

On the other hand, there is also known a griddle in which a cooking iron plate is indirectly heated by a resistance-heated nichrome wire heater or an induction-heated heating body.

[Problems to be solved by the invention] However, in the case of heating by a gas flame, if the iron plate is made thick, the thermal conductivity deteriorates, and it takes a long time for the surface of the iron plate to reach a temperature around 200 ° C at which cooking is possible. However, there was another problem that the thermal efficiency decreased. In addition, the heating method using gas causes the risk of gas explosion and also leads to deterioration of the cooking environment such as temperature rise and oxygen deficiency in the kitchen room, especially in the kitchen room in the underground mall and high-rise buildings. The demand is increasing.

In addition, the resistance heating method using a nichrome wire has a serious problem that it is difficult to accurately control the temperature, and the indirect heating method using an induction-heated heating element using a high frequency has a problem in thermal efficiency and thermal response characteristics.

Further, as a conventional technique, Japanese Patent Laid-Open Nos.
An electromagnetic induction heating device has been proposed in Japanese Patent Publication No. 138935. Particularly, in Japanese Patent Laid-Open No. 51-138935, the cooking pot is attracted to the excitation winding by the attraction force when the electromagnetic induction coil is energized, but the attraction force is applied when the electromagnetic induction coil is de-energized. Since it does not work anymore, the circuit is switched using contacts, the excitation winding is energized through the inductor, and heating is performed using an alternating current weaker than usual. However, in this known example, even when the temperature of the cooking pot that is the object to be heated reaches a predetermined temperature or more, since an alternating current is applied to the electromagnetic induction coil weaker than usual, heating is continued and unnecessary heating is performed. Alternatively, there is a disadvantage that undesired heating continues. Further, since an alternating current is applied to the electromagnetic induction coil, the attraction force is weak, and therefore, the predetermined attraction force cannot be achieved unless the amount of electricity is increased, and there is a problem that power consumption is high. In addition, since an alternating current is always supplied to the electromagnetic induction coil, there is a problem in that electromagnetic vibration occurs and an unpleasant sensation occurs.

In order to solve the above-mentioned conventional problems, the present invention is safe and does not deteriorate the cooking environment by providing means for exerting the action / function of only the electromagnetic attraction force without being involved in heat generation.
Moreover, it is an object to provide an induction heating type griddle having excellent thermal efficiency and thermal response characteristics.

[Means for Solving the Problems] In order to achieve the above-mentioned object, an induction heating griddle of the present invention includes a cooking iron plate and an inner portion of the cooking iron plate which is disposed close to or in close contact with a lower portion of the cooking iron plate. An induction heating type griddle having an electromagnetic induction coil for energizing a low-frequency alternating current for generating an induction current in the direct current for holding the cooking iron plate under the cooking iron plate by suction force. It is characterized in that electromagnetic coils for passing an electric current are arranged close to or close to each other.

In the above invention, it is preferable that the electromagnetic induction coil is provided on the U-shaped iron core, and both ends of the U-shaped iron core are arranged so as to face the back side of the cooking iron plate.

Further, in the above invention, it is preferable that the electromagnetic induction coil is singular or plural, and in the case of plural, at least one is selected from a parallel shape, a radial shape, and a loop shape.

[Operation] When an alternating current with an appropriate frequency is applied to the electromagnetic induction coil, an alternating magnetic flux is generated in a direction orthogonal to the alternating current, and the alternating magnetic flux causes an induced current in the cooking iron plate in a direction orthogonal to the alternating magnetic flux. To do. Due to the induced current, Joule heat is generated inside the cooking iron plate, and the cooking iron plate is directly heated from the inside.

By arranging the electromagnetic induction coil at an appropriate position with respect to the cooking iron plate, the passage position of the alternating magnetic flux in the cooking iron plate, that is, the position where Joule heat is generated by the induced current can be appropriately selected. For example, when cooking a steak, rather than making the surface temperature distribution of the cooking iron plate uniform, grill the meat by heating the center part to a higher temperature, placing vegetables on the periphery and cooking the outermost meat. It is preferable to adjust the surface temperature distribution of the iron plate for cooking so that it can keep warm, etc., but in the induction heating type griddle according to the present invention, it is adjusted to the required surface temperature distribution by selecting the arrangement position of the electromagnetic induction coil. Is easily possible.

As a method of obtaining the required surface temperature distribution, for example, from the arrangement of the electromagnetic induction coils corresponding to each surface temperature distribution, select the arrangement of the induction coil corresponding to the target surface temperature distribution,
A method of attaching a cooking iron plate to the selected arrangement, and selecting an electromagnetic induction coil to be energized so that a desired surface temperature distribution can be obtained from a large number of electromagnetic induction coil groups arranged densely to some extent. It is possible to employ a method, and further, a method of changing the arrangement of the electromagnetic induction coils so as to obtain a desired surface temperature distribution.

In addition, since the DC electromagnetic coil is arranged close to or in close contact with the cooking iron plate, it assists the suction holding of the cooking iron plate by the electromagnetic induction coil for passing AC current, or instead of the DC electromagnetic coil. The iron plate for cooking can be stably held by the suction force. In addition, since an independent electromagnetic induction coil with a direct current is used, the power consumption is extremely low compared to an alternating current, and the generation of electromagnetic vibration can be suppressed and the cooking environment is not deteriorated.

In the case where the electromagnetic induction coil is provided on the U-shaped iron core and both ends of the U-shaped iron core are arranged to face the back surface of the cooking iron plate, the U-shaped iron core and the cooking iron plate bridging both ends thereof are used. An alternating magnetic flux is generated in the closed magnetic circuit composed of, and an induced current is generated inside the cooking iron plate as described above. According to this configuration,
The selection of the arrangement of the electromagnetic induction coil is easier, and since the cooking iron plate is attracted to both ends of the U-shaped iron core, it can be stably held while being energized.

[Embodiment 1] FIGS. 1 and 2 are a side view and a bottom view of an essential part of an embodiment of the present invention, respectively. In the figure, a U-shaped iron core (2) is fixed to the center of a base (1) (shown by a chain line in FIG. 1), and an electromagnetic induction coil is attached to each leg of the U-shaped iron core (2). (3) is provided. In addition, a bar-shaped iron core (4) is fixed to each corner of the base (1), a DC electromagnetic coil (5) is provided in the middle of each bar-shaped iron core (4), and each bar-shaped iron core (4) is The upper end is adjusted to be flush with both ends of the U-shaped iron core (2). Furthermore, cooking iron plates (6) are installed on both ends of the U-shaped iron core (2) and on the upper ends of the rod-shaped iron cores (4).

In the above configuration, when an alternating current having a commercial frequency of 50/60 Hz is applied to the electromagnetic induction coil (3), as described above, the U-shaped iron core (2) and the cooking iron plate (2) that bridges both ends thereof ( An alternating magnetic flux is generated in the closed magnetic circuit consisting of 6) and
An induced current is generated by the alternating magnetic flux and Joule heat is generated by the induced current, so that the cooking iron plate (6) is heated from the inside centering on the alternating magnetic flux passing portion.

The cooking iron plate (6) is attracted to both ends of the U-shaped iron core (2) while the electromagnetic induction coil (3) is energized, and thus is stably held on the base (1). Further, by energizing each DC electromagnetic coil (5), the cooking iron plate (6) can be stably held on the base (1) regardless of whether the electromagnetic induction coil (3) is energized or a power failure occurs. . Also, because it uses an independent electromagnetic induction coil with direct current,
Compared to alternating current, it requires extremely low power, and it can suppress the generation of electromagnetic vibrations and does not deteriorate the cooking environment. When the iron plate for cooking (6) is removed from the base (1) for cleaning or the like, the energization of the electromagnetic induction coil (3) and the DC electromagnetic coils (5) may be stopped.

[Embodiment 2] FIG. 3 is a bottom view of essential parts of another embodiment of the present invention. In the figure, three sets of U-shaped iron cores (2) and electromagnetic induction coils (3) provided on each leg of the U-shaped iron cores (2) similar to those of the first embodiment are arranged side by side, and a cooking iron plate. Induction heating of (6) is attempted relatively uniformly over a wide range. The other structure is the same as that of the first embodiment.

[Embodiment 3] FIG. 4 is a bottom view of essential parts of another embodiment of the present invention. In the figure, three sets of U-shaped iron cores (2) and electromagnetic induction coils (3) provided on each leg of the U-shaped iron cores (2) are arranged in a Y-shape. Induction heating of the cooking iron plate (6) is attempted from the vicinity of its center. The other structure is the same as that of the first embodiment.

[Embodiment 4] FIG. 5 is a bottom view of the essential portions of another embodiment of the present invention. In the figure, a U-shaped iron core (2) similar to that of the first embodiment and an electromagnetic induction coil (3) provided on each leg of the U-shaped iron core are connected endlessly in a triangle shape. It is intended that the iron plate (6) for cooking is induction-heated from the vicinity of its middle portion. The other structure is the same as that of the first embodiment.

[Embodiment 5] FIG. 6 is a bottom view of an essential portion of another embodiment of the present invention. In FIG. 6, the same U-shaped iron core (2) as that of Embodiment 1 and its legs are provided. The combination of the electromagnetic induction coils (3) is endlessly connected in a hexagonal shape, and the connecting portions of adjacent leg portions are also connected in an annular shape. This is also an iron plate for cooking (6 ) Is induction-heated from the vicinity of the middle part. The other structure is the same as that of the first embodiment.

[Advantage of the Invention] As described above, the induction heating griddle according to the present invention is configured such that the cooking iron plate is induction-heated by the electromagnetic induction coil, so that the surface temperature distribution of the cooking iron plate can be adjusted. It has advantages that it is easy, the iron plate for cooking is easily attached and detached, it is easy to wash, it is safe, it does not deteriorate the control environment, and it has excellent thermal efficiency and thermal response characteristics. Also, since the DC electromagnetic coil is placed close to or in close contact with the cooking iron plate, the cooking iron plate is attracted to the DC electromagnetic coil while it is energized, and it is stable regardless of whether or not the cooking iron plate is attracted by the electromagnetic induction coil. It is retained and does not require any other mechanical stabilizing means. Besides,
Since an independent DC current electromagnetic induction coil is used, the power consumption is much lower than AC current, electromagnetic vibration can be suppressed, and the cooking environment is not deteriorated.

Further, in the case where the electromagnetic induction coil is provided on the U-shaped iron core and both ends of the U-shaped iron core are arranged so as to face the back surface of the cooking iron plate, particularly at a low frequency such as a commercial frequency of 50/60 Hertz. Suitable for energizing AC current, more easily adjusting surface temperature distribution, and capable of uniform heating and local heating according to cooking conditions. Cooking iron plate has U-shaped iron core at both ends while energized. Since it is attracted to and held stably, no other stabilizing means is required at least while the electromagnetic induction coil is energized.

[Brief description of drawings]

1 and 2 are a side view and a bottom view of an essential part of an embodiment of the present invention, and FIGS. 3 to 6 are bottom views of an essential part of another embodiment of the present invention. [Explanation of Codes] 1 ... Base, 2 ... U-shaped iron core, 3 ... Electromagnetic induction coil, 4 ...
Rod-shaped iron core, 5 ... DC electromagnetic coil, 6 ... Iron plate for cooking

Claims (3)

[Scope of utility model registration request] 1. A cooking iron plate, and an electromagnetic induction coil which is arranged close to or in close contact with a lower portion of the cooking iron plate to pass a low-frequency alternating current for generating an induced current inside the cooking iron plate. Induction heating griddle,
An induction heating griddle, characterized in that an electromagnetic coil for passing a direct current for holding the cooking iron plate by a suction force is arranged close to or in close contact with the lower portion of the cooking iron plate. 2. An electromagnetic induction coil is provided on a U-shaped iron core,
The induction heating griddle according to claim 1, wherein both ends of the U-shaped iron core are arranged so as to face the back side of the cooking iron plate. 3. The induction heating type according to claim 1, wherein the electromagnetic induction coil is a single or plural, and in the case of plural, it is formed in at least one selected from a parallel shape, a radial shape and a loop shape. Griddle.