JPH0536794U - Induction cooker - Google Patents

Abstract

(57) [Summary] [Objective] To provide an induction heating cooker equipped with an induction heating coil capable of increasing the degree of heating of a portion to be heated of a cooking plate or a cooking pot. In an induction heating cooker that induction-heats a cooking plate or a cooking pot with an induction heating coil, the outer peripheral portions of a plurality of induction heating coils are arranged close to each other or partially overlapped with each other, and the proximity / superposition The direction of the electric current in the combined portion is the same, and the electromagnetic energy in the adjacent / superposed area is increased to strongly heat the specific portion of the cooking plate or the cooking pot corresponding to the adjacent / superposed area. It consists of the configuration.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to an induction heating cooker, and more particularly, to an induction heating cooker including an induction heating coil that can increase a heating degree of a portion to be heated of a cooking plate or a cooking pot.

[0002]

[Prior Art]

 In the induction heating cooker, a cooking plate made of a conductive material is directly provided on the upper surface of the induction heating coil, and the cooking plate itself is induction-heated as a secondary circuit. There is a configuration in which a dielectric plate such as ceramics is provided, the dielectric plate is used as a mounting table, and a cooking pot having a conductive material on the bottom surface can be mounted on the mounting table.

The induction heating coil provided in these induction heating cookers is usually configured as a circular coil that is spirally wound below the plate. It is considered that this is because the shape of the heating coil in the conventional electric heater was directly applied to the induction heating coil.

[0004]

[Problems to be solved by the device]

 However, in the case of the conventional induction heating cooker described above, since the circular coil is uniformly wound, the magnetic flux evenly passes through the cooking plate or the cooking pot as the secondary circuit, and the heating unevenness is small. When using a large pot for heating, it is good, but when using a small pot, there is a problem that the heating efficiency deteriorates.

Therefore, the present inventor has made various studies based on the above points, and as a result, various induction heating coils are used, and the induction heating coils are independently arranged, so that a plurality of heating surfaces are provided. It was clarified that the maximum heating power was obtained by forming and forming a heating pot between the adjacent heating surfaces so that heating could be performed. However, in the case of this induction heating cooker, the increase in electromagnetic energy cannot be obtained between the heating surfaces by the plurality of induction heating coils, and it may not be possible to strongly heat a specific portion of the heating pot or cooking plate. I understood.

The present invention has been made in view of the above-mentioned problems, and an object thereof is to provide an induction heating coil capable of increasing the heating degree of a portion to be heated of a cooking plate or a cooking pot. An object of the present invention is to provide an induction heating cooker equipped with.

[0007]

[Means for Solving the Problems]

 The induction heating cooker of the present invention as a means for solving the above-mentioned problems is an induction heating cooker in which an induction heating coil induction-heats a cooking plate or a cooking pot. Are arranged close to each other or partially overlapped with each other, and the directions of the electric currents at the close / superimposed parts are set to be the same direction, and the electromagnetic energy at the close / superimposed parts is increased to make the close / superimposed parts close to each other. The cooking plate or the cooking pot corresponding to the above is strongly heated at a specific portion. In addition, in the present specification, the cooking pot includes a cooking iron plate and other pots, a frying pan, and the like.

In addition, another induction heating cooker of the present invention has a structure in which the outer peripheral portions of a plurality of adjacent or overlapping induction heating coils are connected in series to form one induction heating coil.

[0009]

[Action]

 In the induction heating cooker of the present invention, like a normal induction heating cooker, a high-frequency current is passed through the induction heating coil, so that the heating plate or the heating pan constituting the secondary circuit is magnetically fluxed by electromagnetic induction. Then, due to the eddy current loss induced in the heating plate or the heating pot, Joule heat is generated, and the Joule heat can be used for heating cooking.

Here, in the present invention, when an electric current flows through the induction heating coil, the induction heating coil has its outer peripheral portions close to or superposed on each other, and the directions of the currents are the same. , The current density of the eddy current induced in the portion of the heating plate or the heating pan constituting the secondary circuit corresponding to the adjacent / superposed portion increases, which causes the Joule heat of the portion corresponding to the portion. Is further increased, so that the cooking can be better cooked at a specific part.

[0011]

【Example】

 Embodiments embodying the present invention will be described below with reference to the drawings. 1 to 2 show an embodiment of the present invention, FIG. 1 is a plan view of an induction heating coil portion in an induction heating cooker, and FIG. 2 is a longitudinal sectional view of the induction heating coil portion.

The induction heating cooker of the present embodiment uses two induction heating coils 1 and 2, and the outer peripheral portions 3 and 4 of the induction heating coils 1 and 2 are partially overlapped and arranged. In addition, the direction of the electric current in the overlapping portion 5 is set to be the same direction, that is, the direction of the current flowing in the adjacent coils of the induction heating coils 1 and 2 is set to the same direction, and the electromagnetic energy in the overlapping portion 5 is increased. In addition, a specific portion of the pot for cooking 6 corresponding to the overlapping portion 5 can be strongly heated. In this embodiment, a dielectric plate 8 such as a ceramic plate or a heat-resistant glass plate is provided on the induction heating coils 1 and 2, and the dielectric plate 8 is used as a mounting table and cooking is performed on the plate. By placing the cooking pot 6 on the cooking pot 6, the cooking pot 6 can be heated and cooked at a specific location as a center.

The induction heating coils 1 and 2 each have a form of being wound in a plane, an ellipse, and a spiral shape. The induction heating coils 1 and 2 are arranged in the vertical direction, and the outer peripheral portions 3 and 4 of the induction heating coils 1 and 2 are partially overlapped with each other. The induction heating coils 1 and 2 are connected to a power source through an inverter circuit, an inverter circuit control unit, and a load detection unit (not shown) as in the conventional cooker described above. Here, the coils 1 and 2 are usually formed by bundling a plurality of conducting wires.

Further, the directions of the currents flowing in the outer peripheral portions 3 and 4 of the induction heating coils 1 and 2 can be the same, and the generation directions of the magnetic flux in the overlapping portion 5 can be made to coincide with each other. It is configured to maximize the heating power in the portion 7 corresponding to the overlapping portion 5, which is a specific portion of the cooking plate or the cooking pot 6 that constitutes the circuit. Further, below the induction heating coils 1 and 2, a ferrite material 10 is arranged via a heat resistant material 9 such as glass fiber or heat resistant synthetic resin.

Further, in the induction heating cooker of the present embodiment, a high-frequency current is supplied to the induction heating coils 1 and 2, and a large magnetic flux is generated in the superposition section 5, and the cooking that forms the secondary circuit by electromagnetic induction is performed. An eddy current is generated in the cooking plate or the cooking pot 6 to heat the eddy current by the eddy current loss, and maximum heating power is generated in the overlapping portion 5 so that the cooking can be performed.

It should be noted that the present invention is not limited to the above-described embodiments, but includes modifications that can be implemented without departing from the scope of the present invention. Incidentally, the form of the induction heating coil is not limited to the form of the above-described embodiment, and may be configured as shown in FIGS. 3 to 4, for example. That is, the configuration shown in FIG. 3 is the configuration in which the two induction heating coils 11 and 12 are arranged close to each other and the outer peripheral portions 3 and 4 are connected in series in the above-described embodiment. Even in the case of this configuration, since the currents flow in the proximity portion 13 located in the central portion are in the same direction, the maximum heating power is obtained in the portion corresponding to the proximity portion 13 as in the above-described embodiment. be able to. In other words, the coil is formed by one coil, and the winding direction is reversed at the central portion of the coil, so that the directions of the currents in the adjacent portions in the central portion are the same direction. . Further, in the drawings, the coil is shown to have a flat disk shape, but it may have a polygonal shape (for example, a hexagonal shape or an octagonal shape).

Further, the configuration shown in FIG. 4 uses four (even number) induction heating coils 14, 15, 16 and 17, and each is wound in a right-angled triangular shape with its outer side being a quarter arc shape. The right-angled portions are assembled into a circular combination heating induction coil. Even in this case, the maximum heating power can be obtained in the central portion 18. Also, when a wok-shaped pot is used as a cooking pot, the dielectric plate such as a ceramic plate also has a curved surface, so that the heating induction coil should be fitted to the lower surface of the dielectric plate. It adheres along the curved surface with silicone or epoxy adhesive (that is, by slightly bending the coil) and integrates it, so that the center of the bottom of the wok, that is, the lower bottom is heated centrally. .

[0018]

[Effect of the device]

 As is clear from the above description, according to the induction heating cooker of the present invention, a plurality of induction heating coils are used, the outer peripheral portions thereof are close to or overlap with each other, and the current directions are the same. As a result, the current density of the eddy current induced in the portion of the cooking plate or the heating pot constituting the secondary circuit corresponding to the adjacent / superposed portion increases, and as a result, the joule of the portion corresponding to the portion is increased. Since the heat is further increased, there is an effect that cooking at a specific portion can be favorably performed.

[Brief description of drawings]

FIG. 1 is a plan view of an induction heating coil unit in an induction heating cooker showing an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of the induction heating coil unit shown in FIG.

FIG. 3 is a plan view of an induction heating coil unit according to another embodiment of the present invention.

FIG. 4 is a plan view of an induction heating coil unit according to another embodiment of the present invention.

[Explanation of symbols]

1, 2 ... Induction heating coil, 3, 4 ... Peripheral portion of induction heating coil, 5 ... Lapping area, 6 ... Cooking pot (or cooking plate), 7 ... Cooking Part corresponding to the overlapping part of the cooking plate or cooking pot,
8 ... Ceramic plate, 11, 12 ... Induction heating coil, 13 ... Proximity part, 14, 15, 16, 17
... Induction heating coil, 18 ... Center part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor, Masaru Ikeda 10 Shinritsu Electric Co., Ltd., 1 East Coast Road, Kudamatsu City, Yamaguchi Prefecture

Claims (2)

[Scope of utility model registration request] 1. In an induction heating cooker for induction heating a cooking plate or a cooking pot with an induction heating coil, the outer peripheral portions of a plurality of induction heating coils are arranged close to each other or partially overlapped with each other, and the proximity is provided.・ The direction of the electric current in the overlapping portion is set to the same direction, and the electromagnetic energy in the adjacent / superposing portion is increased to
An induction heating cooker characterized in that a specific portion of the cooking plate or the cooking pot corresponding to the overlapping portion is strongly heated. 2. The induction heating cooker according to claim 1, wherein the outer peripheral portions of a plurality of adjacent or overlapping induction heating coils are connected in series to form one induction heating coil.