JP4716942B2 - Induction heating cooker - Google Patents

Description

  The present invention relates to an induction heating cooker suitable for use in, for example, a system kitchen used in a general household.

  To provide a thin induction heating cooker that does not cause high-frequency magnetic flux generated from a heating coil to interlink with a control component and malfunction or heat the floor as a conventional thin induction heating cooker A heating coil for inductively heating the cooking pan; a magnetic body provided on the lower surface of the heating coil; a control board mounted under the magnetic body for driving the heating coil; and the control board and the magnetic body There is a conductive shielding plate provided between the magnetic material and the conductive shielding plate in contact with the bottom surface of the magnetic material (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 05-315067 (first page, FIG. 1)

  Currently, a thin induction heating cooker is required to meet the market demand for increasing the height of an oven, a fish roaster, or the like disposed under a kitchen built-in induction heating cooker. However, a circuit board such as an inverter circuit that generates a high-frequency current in the heating coil and a control circuit that controls heating is disposed under the conductive coil and has a conductive shielding plate as described above. However, it has been difficult to reduce the thickness of the conventional configuration. Further, if the heating coil and the circuit board are not arranged in two stages and the heating coil and the circuit board are arranged on the same plane, there is a problem that the control circuit may malfunction due to the leakage magnetic flux generated by the heating coil or the heat generation. .

  The present invention has been made to solve the above-described problems of the prior art, and by arranging the inverter circuit and the control circuit side by side in the horizontal direction of the heating coil, the induction heating cooker can be thinned and leaked. The object is to provide an induction cooking device that is not affected by magnetic flux or heat generation.

  An induction heating cooker according to the present invention includes a heating coil formed in a disc shape, a main board on which an inverter circuit for driving the heating coil provided in a lateral direction of the heating coil is mounted, and the heating coil And a sub circuit board that is disposed in a substantially vertical plane that passes through a substantially central portion of the heating coil.

  In the present invention, the main board on which the inverter circuit is mounted is provided in the lateral direction of the heating coil, and the sub board on which the control circuit for controlling the heating coil via the inverter circuit is mounted is substantially vertical and is substantially the heating coil. By arranging in a plane passing through the central portion, the influence of the leakage magnetic flux generated by the heating coil does not occur in the control circuit. Moreover, it becomes easy to avoid the influence of the heat which a heating coil and an inverter circuit generate | occur | produce because the sub board | substrate was installed in the main board | substrate arranged in parallel with the heating coil. Therefore, it is possible to provide an induction heating cooker that is thin and eliminates the problem of heat.

Embodiment 1 FIG.
1-3 is a figure which illustrates typically the principal part of the induction heating cooking appliance which concerns on Embodiment 1 of this invention, FIG. 1 is side sectional drawing which shows arrangement | positioning of a principal part apparatus, FIG. Fig. 3 is a top view when the top plate of 1 is removed, Fig. 3 is a diagram showing the direction of magnetic flux generated by the heating coil, (a) is a plan view, and (b) is a side view. Note that the same reference numerals denote the same or corresponding parts throughout the drawings. In the figure, the heating coil 1 formed in a disk shape is horizontally provided in the vicinity of the top plate (top plate) 3 on the front (left direction in FIG. 1) side of the casing 2 constituting the induction heating cooker. . The main board 5 on which the inverter circuit 4 for driving the heating coil 1 is mounted is arranged so as to be arranged in the lateral direction of the heating coil 1 from the center part to the rear part of the housing 2, and the extending surface of the heating coil 1 Is provided on a plane parallel to (or may be the same plane). For example, a heat radiating fin 7 made of a metal such as aluminum or copper is attached to a heat generating component 6 such as an IGBT constituting the inverter circuit 4.

  The inverter circuit 4 provided on the main board 5 is provided on the side close to the heating coil 1, and the sub board 8 is erected in the vertical direction on the opposite side of the heating coil 1 with respect to the radiating fins 7 of the inverter circuit 4. A part or all of a control circuit (not shown) for controlling the heating coil 1 via the inverter circuit 4 is mounted on the sub-board 8. Note that at least a portion of the control circuit that is weak against heat and magnetic flux is mounted on the sub-board 8. The sub-board 8 is disposed on the main board 5 so as to be substantially vertical and the extension line L passes through the vicinity of the center portion C1 of the heating coil 1. In the first embodiment, an air path is formed so that the cooling air drawn from the air inlet 10 by the cooling fan 9 flows in the order of the sub-board 8, the inverter circuit 4 including the heat radiating fins 7, and the heating coil 1. Yes. FIG. 3 schematically shows that the magnetic field lines 11 are formed from the central portion C1 of the heating coil 1 so as to extend in the radial direction and along the vertical plane. Since other configurations are the same as those of the conventional apparatus, description thereof is omitted.

Next, the operation of the first embodiment configured as described above will be described. When a cooking utensil such as a metal pan (not shown) is placed at a position corresponding to the heating coil on the top plate 3 and an operation switch (not shown) is turned on, cooking is performed by the magnetic flux generated by the heating coil 1. The operation in which the eddy current flows through the instrument and is heated is exactly the same as that of the conventional apparatus, and thus the description thereof is omitted.
The magnetic flux generated by the heating coil 1 is generated radially from the heating coil 1 as shown in FIG. 3A and in a loop on the vertical plane as shown in FIG. In the configuration of the first embodiment, since the sub-board 8 on which the control circuit is mounted is disposed in the vertical plane passing through the vicinity of the center portion C1 of the heating coil 1 as indicated by the extension line L, the heating coil 1 Radiated leakage flux does not penetrate the control circuit. Moreover, since the metal radiation fins 7 are disposed between the control circuit and the heating coil 1, the magnetic flux shielding effect can be expected. Therefore, the influence of the leakage magnetic flux on the control circuit can be remarkably reduced.

  Further, since the cooling air drawn from the air inlet 10 by the cooling fan 9 flows in the order of the sub-board 8, the heat radiating fins 7, the inverter circuit 4, and the heating coil 1, the heat generated from the heating coil 1 and the inverter circuit 4. Does not flow to the control circuit side, so there is little influence of heat on the control circuit. Even if heat from the inverter circuit 4 side is transferred to the sub board 8 side through the main board 5, the connection between the sub board 8 on which the control circuit is mounted and the main board 5 on which the inverter circuit 4 is mounted is connected. Since the means is cooled, the heat transfer to the sub-board 8 is small, and the sub-board 8 is also cooled on both the front and back sides, so that the control circuit is not affected by the heat generated by the inverter circuit 4 and is not in a high temperature state.

In the first embodiment, the cooling air sucked from the air inlet 10 by the cooling fan 9 is configured to flow in the order of the sub board 8, the inverter circuit 4 including the radiating fins 7, and the heating coil 1. However, the present invention is not limited to this. Instead, any cooling structure may be used as long as the sub-board 8 is cooled and the air that has cooled the heating coil 1 and the inverter circuit 4 does not hit the control circuit.
As described above, according to the configuration of the first embodiment, the control circuit is not affected by the leakage magnetic flux of the heating coil 1 and the heat generated by the heating coil 1 or the inverter circuit 4, and is stably controlled. Can be done. In addition, since the main board 5 and the heating coil 1 can be arranged side by side on the same plane or parallel plane, a thin induction heating cooker can be provided.

Embodiment 2. FIG.
FIG. 4 is a top view showing a schematic configuration of an induction heating cooker according to Embodiment 2 of the present invention. In the figure, in the housing 2, a heating coil 1A, an inverter circuit (not shown), a main board 5A provided with heat radiating fins 7A, a sub board 8A standing on the main board 5A, and an illustration are omitted. A first heating unit 12A composed of a cooling fan, a heating coil 1B, an inverter circuit (not shown), a main board 5B provided with radiating fins 7B, etc., a sub board 8B erected on the main board 5B, and The 2nd heating unit 12B which consists of the cooling fan which is abbreviate | omitted is arranged in parallel through the gap | interval. The two heating units 12A and 12B are configured in the same manner as in the first embodiment. The sub-board 8A is on a vertical plane passing through the central portion C1A of the heating coil 1A, and the sub-board 8B is the center of the heating coil 1B. Each is disposed on a vertical plane passing through the part C1B.

  An electric heater 13 for heating, for example, pottery or glass cooking utensils is provided on the back side (right side in the figure) of the gap between the two heating units 12A and 12B. The outer periphery of the electric heater 13 is For example, it is covered with a magnetic flux shielding member 14 made of a metal plate such as iron, stainless steel or copper. In the magnetic flux shielding member 14, the leakage magnetic flux infiltrates obliquely from the heating coil 1B or 1A on the other heating unit side with respect to the sub board 8A or 8B of one heating unit in the two heating units 12A and 12B. Is disposed at a position to prevent this in cooperation with the heat radiating fins 7A or 7B. For example, the sub-board 8A is configured so as not to be affected by the leakage magnetic flux generated from the heating coil 1B by disposing the magnetic flux shielding member 14 and the radiation fin 7A between the heating coil 1B at an oblique position. Has been.

  In the second embodiment provided with a plurality of heating units 12A and 12B configured as described above, the sub-board on which the control circuit is mounted for each heating unit by the same operation as in the first embodiment. The influence of leakage magnetic flux or heat generation on the pair of 8A or 8B is eliminated, and the thickness is reduced. Moreover, with respect to the interference between the heating units, the electric heater 13 provided with the magnetic flux shielding member 14 is connected between one sub-board and the other heating coil in the first heating unit 12A and the second heating unit 12B. By being arranged so as to be located at the position, it is possible to shield the leakage magnetic flux that enters the sub-board of one heating unit from the oblique direction from the heating coil of the other heating unit. In addition, in this example, since the radiation fins 7A or 7B are interposed in a direction in which the central portion of the other heating coil is desired in an oblique direction from one sub-substrate, the shielding effect of the leakage magnetic flux is further enhanced. .

  As described above, according to the second embodiment, even a general type induction heating cooker in which one electric heater is disposed between two heating coils is driven in the lateral direction of the heating coil. The first and second heating units 12A and 12B similar to those of the first embodiment in which the main board on which the inverter circuit is mounted are arranged in parallel and the sub board on which the control circuit is mounted are erected on the main board are used, By configuring the magnetic flux shielding member 14 provided around the electric heater 13 so as to be positioned between one sub-board and the other heating coil of the first heating unit 12A and the second heating unit 12B, The control circuits provided on the substrates 8A and 8B are not affected by the leakage magnetic flux generated by the heating coils 1A and 1B, and the generation of the heating coils 1A and 1B and an inverter circuit (not shown) is generated. The influence of heat can perform a stable control operation without being that. The electric heater 13 is originally thin, so that a thin induction heating cooker can be easily provided.

  The position and number of the cooling fans 9 are not particularly limited. For example, the cooling air fed by one cooling fan may be divided into two using an appropriate ventilation guide member, and the two heating units may be cooled respectively. Moreover, although the sub board | substrate 8 was provided on the main board | substrate 5, the sub board | substrate 8 can also be made to hold | maintain to a housing | casing independently, for example. Further, the position of the sub-board 8A on the main board 5A illustrated in FIG. 4 is different from the position of the sub-board 8B on the main board 5B (is a line-symmetric arrangement), but is not limited thereto. Needless to say, it can be standardized, for example, by making both of them have the same arrangement.

Side surface sectional drawing which shows arrangement | positioning of the principal part apparatus of the induction heating cooking appliance which concerns on Embodiment 1 of this invention. The top view when the top plate of FIG. 1 is removed. It is a figure which shows the direction of the magnetic flux which a heating coil generates, (a) is a top view, (b) is a side view. The top view which shows schematic structure of the induction heating cooking appliance by Embodiment 2 of this invention.

Explanation of symbols

1, 1A, 1B Heating coil, 2 Housing, 3 Top plate, 4 Inverter circuit, 5, 5A, 5B Main board, 6 Heating component, 7, 7A, 7B Heat radiation fin, 8, 8A, 8B Sub board, 9 Cooling Fan, 10 Intake port, 11 Magnetic field line, 12A First heating unit, 12B Second heating unit, 13 Electric heater, 14 Magnetic flux shielding member, C1, C1A, C1B Center part.

Claims (3)

  A main board on which a heating coil formed in a disc shape, an inverter circuit for driving the heating coil provided in a lateral direction of the heating coil is mounted, and control for controlling the heating coil via the inverter circuit An induction heating cooker comprising: a circuit board mounted thereon; and a sub-board disposed in a substantially vertical plane passing through a substantially central portion of the heating coil.   The main board is provided with heat radiating fins for cooling the heat generating components constituting the inverter circuit, and the sub board is erected on the main board opposite to the heating coil with respect to the heat radiating fins. The induction heating cooker according to claim 1, wherein a cooling air passage is formed from the sub-board through the heat radiation fin to the heating coil. 1st heating unit comprised by the said heating coil, main board | substrate, and sub board | substrate, and comprised by the said heating coil, main board | substrate, and sub board | substrate arrange | positioned through this gap with respect to this 1st heating unit And a magnetic flux shielding member is provided around the second heating unit and the first heating unit and one of the sub-boards of the first and second heating units and the other heating coil. The induction heating cooker according to claim 1 or 2, further comprising an electric heater.

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