JP4019323B2 - Induction heating cooker - Google Patents

Description

  The present invention relates to an induction heating cooker for cooking by heating a heated cooking container.

  12 and 13 are a plan view and a side view, respectively, of a conventional induction heating cooker. An insulating plate 2 on which an object to be heated such as a pan is placed is provided on the upper surface of the main body 1. A cooling fan 4 is disposed below the intake port 3 and the intake port 3 opened toward the bottom. A heating coil 5 for inductively heating an object to be heated is provided below the insulating plate 2, and a circuit board 6 on which an inverter circuit for controlling the output of the heating coil 5 is mounted is disposed below the heating coil 5. ing. The circuit board 6 has, for example, a heat generating component 7 and components such as heat radiating fins 8 attached to the heat generating component 7 mounted thereon, and has a structure with the mounting surface as the upper surface (for example, Patent Document 1).

JP 2003-86338 A (FIG. 3)

  In the conventional induction heating cooker configured as described above, the circuit board 6 that controls the output of the heating coil is disposed below the heating coil 5, and the heat generation is performed between the heating coil 5 and the circuit board 6. Since a distance required to arrange the component 7 and the heat dissipating fins 8 attached to the heat generating component 7 is necessary, there is a problem that the induction heating cooker main body is prevented from being thinned.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to obtain an induction heating cooker that enables a thin induction heating cooker body.

An induction heating cooker according to the present invention is an induction heating cooker including an induction heating coil and a circuit board on which at least a drive circuit that supplies a high-frequency current to the induction heating coil is mounted. One side is formed in a concave shape in accordance with the outer peripheral shape of the induction heating coil, the circuit board is arranged in the horizontal direction of the induction heating coil so that the one side of the concave shape does not overlap with the outer peripheral portion of the induction heating coil, The circuit board is disposed with a surface on which a circuit component for supplying a high-frequency current is mounted on an induction heating coil including the drive circuit facing down, and a heat dissipating fin attached to an inner heat generating component of the circuit component is provided on the circuit board. of arranged so as to extend toward the lower side below the heating coil, the heat radiation fins, and maximized in the induction heating cooker body in accordance with the size of the heating coil To arrange below the heating coil, the fixation of the induction heating cooking device body of the heating coil, do all through the heat radiating fins, and the heat radiating fins double as a support base of the induction heating coil Is.

The induction heating cooker according to the present invention is an induction heating cooker including an induction heating coil and a circuit board on which at least a drive circuit for supplying a high-frequency current to the induction heating coil is mounted. Is formed in a concave shape in accordance with the outer peripheral shape of the induction heating coil, and the circuit board is disposed in the horizontal direction of the induction heating coil so that one side of the concave shape does not overlap with the outer peripheral portion of the induction heating coil. Inverter circuit components such as switching elements and diodes, heat dissipation fins attached to the heat generating parts, and drive circuit components for driving the switching elements are mounted on the lower side of the inverter circuit. Induction heating cooker body than a circuit board placed below the induction heating coil and mounted on the top surface of the circuit board with heat-generating parts, heat-dissipating fins, etc. It becomes possible to reduce the thickness of.
In addition, a heat dissipating fin attached to an internal heat generating component of the circuit component is disposed so as to extend from below the circuit board toward the lower portion of the heating coil, and the heat dissipating fin is guided in accordance with the size of the heating coil. The heating coil is maximized in the heating cooker body and arranged below the heating coil, and the heating coil is fixed to the induction heating cooker body through the radiation fins. Since it also serves as a support for the induction heating coil, it is possible to further improve the cooling effect by the cooling fan.

Embodiment 1 FIG.
FIG. 1 shows an internal plan view of the induction heating cooker according to the embodiment of the present invention, and FIG. 2 shows a side view thereof. In the present embodiment, an induction heating cooker having one heating coil is shown as an example. 1 and 2, the same or corresponding parts are denoted by the same reference numerals.
1 and 2, 11 is a main body of the induction heating cooker, 12 is a top plate on which a cooking container (not shown) provided on the upper surface of the main body 11 is placed, and 13 is behind the main body 11. An intake port opened upward, 14 is a cooling fan provided at an opposing position below the intake port 13, and 15 is disposed below the top plate 12 to heat the top plate 12. A heating coil for induction heating a cooking container to be heated placed on a portion (not shown), which is in close contact with the top plate 12 by a spring 22 provided on a support column 21 attached to the casing of the main body 11.

Reference numeral 16 denotes a board (hereinafter referred to as a circuit board) on which circuit components of an inverter circuit for supplying a high-frequency current to the heating coil 15 are mounted. The circuit board 16 is arranged on one side of the board in accordance with the outer peripheral shape of the heating coil 15. Are arranged in the horizontal direction of the heating coil 15, for example, so that one side of the concave arc shape does not overlap with the outer periphery of the heating coil 15. The curvature of the arc on one side of the circuit board 16 is not necessarily matched with the outer periphery curvature of the heating coil 15, but in order to increase the area of the circuit board 16 in the limited space of the main body 11. It is desirable to be as close as possible.

The circuit board 16 includes, for example, a heating element 17 such as a switching element and a diode that constitutes an inverter circuit, a large current portion including a radiating fin 18 attached to the heating element 17, a capacitor 19, a coil 20, and the switching element. Inverter circuit components such as a drive circuit (not shown) for driving the battery are mounted, and the lower surface side (the bottom surface side of the main body in the figure) of the heat dissipating fin 18 is the housing of the main body 11 with the mounting surface as the bottom For example, by fixing with an adhesive, a screw or the like (not shown), the heating coil 15 is supported in the horizontal direction so as not to overlap with the outer peripheral portion of the heating coil 15. The heat dissipating fins 18 are cooled by the air blowing operation of the cooling fan 14, and heat can be dissipated from the housing by fixing the lower side to the housing of the main body 11, thereby improving the heat dissipating performance. .

The operation of the induction heating cooker configured as described above will be described with reference to FIGS.
When the cooked container is placed on the heating portion on the top plate 12 and cooking is started, the circuit is transferred to the heating coil 15 disposed below the top plate 12 at a position facing the cooked container. A high frequency current is supplied from an inverter circuit mounted on the substrate 16. This high-frequency current generates a high-frequency magnetic field in the heating coil 15, and this high-frequency magnetic field generates an eddy current at the bottom of the cooked container. The eddy current flows through the bottom of the cooking container to be heated and generates heat by the Joule heat of the eddy current and the container resistance component to be induction-heated.

On the other hand, simultaneously with the start of cooking, the cooling fan 14 is driven, sucks outside air from the air inlet 13 opened at the rear of the main body 11 and blows it to the front side of the main body 11. And it is sprayed by the said heat-emitting component 17 of the circuit component mounted in the said circuit board 16 arrange | positioned downstream of ventilation, the radiation fin 18, the said heating coil 15, etc., these are cooled, and after that of the main body 11 The air is exhausted from an exhaust port (not shown).

  As described above, in the present embodiment, one side of the circuit board 16 on which the inverter circuit that supplies the high-frequency current to the heating coil 15 is formed into a concave arc shape in accordance with the outer peripheral shape of the heating coil 15. For example, a switching element, a diode, or the like that constitutes an inverter circuit below the circuit board 16 is disposed in the horizontal direction of the heating coil 15 so that the one side of the arc shape does not overlap with the outer peripheral portion of the heating coil 15. Since the inverter circuit components such as the heat generating component 17, the heat dissipating fin 18 attached to the heat generating component 17, and the drive circuit for driving the switching element are mounted, the circuit board is disposed below the conventional heating coil. It is possible to make the induction heating cooker body 11 thinner than those in which heat generating parts, heat radiating fins, and the like are mounted on the upper surface of. In addition, since the mounting surface of the circuit board 16 such as the heat generating components 17 and the heat radiating fins 18 is on the lower side, the cooling fan 14 effectively blows air to the heat generating components 17, the heat radiating fins 18, the heating coil 15, and the like. Cooling can be performed by spraying on.

In the first embodiment, an example in which there is one heating coil has been described. However, an internal plan view of FIG. 3 (the same or corresponding parts as those in FIG. In the case where there are two or more heating coils, the circuit boards 16a and 16b on which inverter circuits for supplying high-frequency currents to the heating coils 15a and 15b are mounted as shown in FIG. One side is formed into a concave arc shape in accordance with the outer peripheral shape of the heating coils 15a, 15b, and the heating coils 15a, 15b are arranged so that one side of the concave arc shape does not overlap with the outer peripheral portion of the heating coils 15a, 15b, respectively. Are arranged in the horizontal direction, and circuit components such as the heat generating parts of the inverter circuit and heat radiating fins attached to the heat generating parts are mounted on the lower sides of the circuit boards 16a and 16b, respectively. In Rukoto, form 1 similarly thinner body of the embodiment is possible. Further, induction heating operation when cooking is started with two or more heating coils, and cooling fans 14a and 14b provided for each heating coil driven simultaneously with the start of cooking. The cooling operation or the like by the operation is the same as that described in the first embodiment. (The same applies to Embodiments 2 to 4 below.)

Embodiment 2. FIG.
In the first embodiment, one side of the circuit board is formed in a concave arc shape in accordance with the outer peripheral shape of the heating coil, and the horizontal direction of the heating coil is set so that the one side of the concave arc shape and the outer peripheral portion of the heating coil do not overlap. The circuit board is mounted on the lower side of the circuit board and mounted with circuit components such as a heat generating part of the inverter circuit and a heat radiating fin, thereby enabling the body to be thinned. In the present embodiment, a heating coil is provided for a form for increasing the heat radiation area of the heat radiation fin mounted on the lower side of the circuit board as well as making the main body thinner in the first embodiment. An induction heating cooker is shown as an example.
FIG. 4 shows an internal plan view of the induction heating cooker in the present embodiment, and FIG. 5 shows a side view thereof. 4 and 5, the same or corresponding parts as those in FIGS. 1 and 2 of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

In the present embodiment, as shown in FIGS. 4 and 5, the radiating fins 18 mounted together with the heat generating components 17 on the lower side of the circuit board 16 arranged in the horizontal direction of the heating coil 15 are provided on the circuit board. 16 is arranged in the horizontal direction of the heating coil 15, and the space created below the heating coil 15 is used to extend in the horizontal direction of the main body 11 in the space to increase the heat radiation area. It is intended to be placed in. Other structures are the same as those in the first embodiment.

In the induction heating cooker configured as described above, the heated cooking container is placed on the portion of the heating coil 15 on the top plate 12, and the induction heating operation when cooking is started and simultaneously with the start of cooking. Since the cooling operation of the heat generating component 17, the heat radiating fin 18, and the heating coil 15 by the air blowing operation of the driven cooling fan 14 is the same as that described in the first embodiment, the description thereof will be omitted.

  As described above, in the present embodiment, the circuit board 16 is disposed in the horizontal direction of the heating coil 15 in order to increase the heat dissipating area of the heat dissipating fins 18 mounted together with the heat generating components 17 on the lower side of the circuit board 16. Since the space born below the heating coil 15 is used to extend in the horizontal direction of the main body 11 of the space to increase the heat radiation area, the space is disposed below the heating coil 15. As with the first embodiment, the heat sink fin 18 is blown by the cooling fan 14 by extending the heat dissipating fin 18 by using the space created below the heating coil 15 and increasing the heat dissipating area. Can increase the cooling effect.

In the above embodiment, an example in which there is one heating coil has been described. However, in the case where there are two or more heating coils as shown in FIG. 3, one side corresponds to the outer peripheral shape of each heating coil described above. By arranging the circuit board having a concave arc shape in the horizontal direction of each heating coil, the heat radiation fins are extended using the space created below the heating coils to increase the heat radiation area. The effect is obtained.

Embodiment 3 FIG.
In the second embodiment, in order to increase the heat radiation area of the heat radiation fin mounted on the circuit board along with the thinning of the main body, the circuit board is extended to the space below the heating coil that is created by arranging the circuit board in the horizontal direction. In this way, the heat radiation area is increased. In the present embodiment, an induction heating cooker having one heating coil will be described as an example of a configuration in which the heat dissipating fins are further enlarged to serve also as a support for the heating coil.
FIG. 6 shows an internal plan view of the induction heating cooker in the present embodiment, and FIG. 7 shows a side view thereof. 6 and 7, the same or corresponding parts as those in FIGS. 1 and 2 of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

In the present embodiment, as shown in FIGS. 6 and 7, the heat dissipating fins 18 mounted together with the heat generating components 17 are arranged below the circuit board 16, and the circuit board 16 is arranged in the horizontal direction of the heating coil 15. By using the space below the heating coil 15 generated by this, the body 11 fits in the body 11 in accordance with the size of the heating coil 15 so as to serve as a support for the heating coil 15 in the horizontal direction of the body 11 in the space. The size is maximized within the range and arranged below the heating coil 15. The heat dissipating fin 18 and the heating coil 15 that also serve as a support base are, as shown in FIG. 7, a screw 40 from the lower side of the heat dissipating fin 18 on a support member 30 provided at the lower portion of the heating coil 15, for example. The circuit board 16 is fixed to the housing of the main body 11 with, for example, an adhesive or screws, as in the first embodiment. Thus, the heating coil 15 is supported in the horizontal direction, so that the heating coil 15 and the circuit board 16 form an integral structure. Other structures are the same as those in the first embodiment.

In the induction heating cooker configured as described above, the heated cooking container is placed on the portion of the heating coil 15 on the top plate 12, and the induction heating operation when cooking is started and simultaneously with the start of cooking. The cooling operation and the like of the heat generating component 17, the radiating fin 18, the heating coil 15 and the like due to the blowing operation of the driven cooling fan 14 are the same as those described in the first embodiment, and will not be described.

  As described above, in the present embodiment, the heat dissipating fins 18 that are mounted together with the heat generating components 17 on the lower side of the circuit board 16 are provided with the heating coil that is generated by arranging the circuit board 16 in the horizontal direction of the heating coil 15. 15 is extended using the space below 15, so that it also serves as a support for the heating coil 15, for example, in accordance with the size of the heating coil 15, it is maximized within a range that can be accommodated in the main body 11. Since it is arranged at the lower side, the cooling effect by the cooling fan 14 can be further improved as the main body is made thinner as in the first embodiment. In addition, the heating coil 15 and the circuit are fixed by fixing the radiating fin 18 and the heating coil 15 and supporting the heating coil 15 in the horizontal direction of the circuit board 16 by fixing the radiating fin 18 to the casing on the lower side. When the substrate 16 has an integral structure, it is possible to simplify the assembly process when manufacturing the induction heating cooker, and the assembly man-hours and the assembly processing costs can be reduced.

In the above embodiment, an example in which there is one heating coil has been described. However, even when there are two or more heating coils as shown in FIG. 3, one side is concave according to the outer peripheral shape of each heating coil. By arranging the circuit board with the circular arc shape in the horizontal direction of each heating coil, the heat radiation fin is extended using the space created below the heating coil, and the heating coil is also used as a support for the heating coil. In accordance with the size of the heat sink, it is maximized within the range that can be accommodated in the main body, and is arranged below the heating coil. By fixing the radiation fin and the heating coil and fixing to the casing on the lower side of the radiation fin, By the horizontal support of the heating coil of the circuit board, the heating coil and the circuit board form an integral structure, and the same effect as described above can be obtained.

Further, in the above-described embodiment, the radiating fin has been described as being maximized within a range that fits in the main body in accordance with the size of the heating coil so that it also serves as a support for the heating coil. If it can serve as both, it will not be limited to this size.

Embodiment 4 FIG.
In the said Embodiment 1-3, it showed about the form of the circuit board which mounts the circuit component of the inverter circuit with which an induction heating cooking appliance is equipped, and the radiation fin mounted on this circuit board with a heat-emitting component. In the present embodiment, when the circuit board on which the inverter circuit having the concave arc shape on one side described in the first to third embodiments is mounted, for example, from a rectangular or square circuit board, it corresponds to that. For example, an induction heating cooker having one heating coil is shown as an example in which the one-side substrate is configured as a circuit board on which a control circuit for displaying the heating state of the heating coil is mounted.
FIG. 8 shows an internal plan view of the induction heating cooker in the present embodiment. In FIG. 8, the same or corresponding parts as those in FIG. 1 of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
In FIG. 8, reference numeral 26 denotes a circuit board on which a control circuit for displaying the heating state of the heating coil 15 that performs induction heating operation when a high frequency current is supplied from an inverter circuit mounted on the circuit board 16, for example. Hereinafter referred to as a display control board).

As shown in FIG. 9, when the circuit board 16 having a concave arc shape on one side is removed from a rectangular or square circuit board as shown in FIG. An arc-shaped board is used as a circuit board on which a control circuit for displaying the heating state of the heating coil 15, for example, is mounted. Thus, by removing the circuit board 16 and the display control board 26 from a rectangular or square board, it is possible to reduce the remainder of the board and increase the number of boards to be taken, and thus the board cost. Can be reduced.

The display control board 26 has, for example, a control circuit for displaying the heating state on the front side of the main body 11 in the horizontal direction of the heating coil 15 with one side of a convex arc shape as the heating coil 15 side. (Not shown) is disposed on the lower side, and is wired with a display unit (not shown) disposed on the front side of the main body 11, for example. Other structures are the same as those in the first embodiment.

In the induction heating cooker configured as described above, the heated cooking container is placed on the portion of the heating coil 15 on the top plate 12, and the induction heating operation when cooking is started and simultaneously with the start of cooking. Since the cooling operation of the heat generating component 17, the heat radiating fin 18, and the heating coil 15 by the air blowing operation of the driven cooling fan 14 is the same as that described in the first embodiment, the description thereof is omitted.

  As described above, in the present embodiment, for example, when the circuit board for mounting the inverter circuit having a concave arc shape on one side is removed from a rectangular or square circuit board, the corresponding convex on one side is taken. For example, a display control board on which a control circuit for displaying the heating state of the heating coil is mounted, and one side of the display control board having a convex arc shape is, for example, the heating coil side As described above, since the heating coil is arranged on the front side of the main body in the horizontal direction, as with the first embodiment, the circuit board and the display control board are changed from the rectangular or square board together with the thinning of the main body. By removing the substrate, the remainder of the substrate can be reduced, the number of substrates can be increased, and the substrate cost can be reduced.

Similarly in the second and third embodiments, when the circuit board on which the inverter circuit having a concave arc shape on one side is mounted is removed from a rectangular or square circuit board, one side corresponding thereto is taken. Needless to say, the convex arc-shaped substrate can be used as a display control substrate on which a control circuit for displaying the heating state of the heating coil is mounted.

In the above embodiment, an example in which there is one heating coil has been described. However, in the case where there are two or more heating coils as shown in FIG. 3, each heating is similarly performed from a rectangular or square circuit board. As a display control board that mounts a control circuit for displaying the heating state of a convex arc-shaped board on one side corresponding to a concave arc-shaped circuit board that is concave on one side so as to correspond to the coil Needless to say, it can be configured to be disposed, for example, on the front side of the main body in the horizontal direction of the heating coil.

In the above-described embodiment, the display control board 26 having a convex arc shape has been described so as to be disposed on the front side of the main body in the horizontal direction of the heating coil 15, but the circuit board 16 is arranged in the horizontal direction of the heating coil 15. As shown in the internal plan view of FIG. 10 and the side view of FIG. 11, for example, a convex arc-shaped portion of the display control board 26 is utilized using the space created below the heating coil 15. The display control board may be arranged below the heating coil so that the outer peripheral portion of the heating coil 15 overlaps with the display unit described above.

  The present invention can be used for, for example, a kitchen built-in type or a stationary type induction heating cooker.

It is an internal top view of the induction heating cooking appliance in Embodiment 1 of this invention. FIG. 2 is a side view of FIG. 1 according to the first embodiment. It is an internal top view of the induction heating cooking appliance in the other example which concerns on Embodiment 1. FIG. It is an internal top view of the induction heating cooking appliance in Embodiment 2 of this invention. FIG. 5 is a side view of FIG. 4 according to the second embodiment. It is an internal top view of the induction heating cooking appliance in Embodiment 3 of this invention. FIG. 7 is a side view of FIG. 6 according to the third embodiment. It is an internal top view of the induction heating cooking appliance in Embodiment 4 of this invention. FIG. 10 is a combined diagram of a circuit board and a display control board according to a fourth embodiment. It is an internal top view of the induction heating cooking appliance in the other example which concerns on Embodiment 4. FIG. FIG. 11 is a side view of FIG. 10 according to the fourth embodiment. It is an internal top view of the conventional induction heating cooking appliance. It is a side view of the conventional induction heating cooking appliance.

Explanation of symbols

  11 Induction heating cooker body, 12 Top plate, 13, 13a, 13b Air inlet, 14, 14a, 14b Cooling fan, 15, 15a, 15b Heating coil, 16, 16a, 16b Circuit board, 17 Heat generating component, 18 Heat dissipation Fin, 21 strut, 22 spring, 26 display control board, 30 support member, 40 screw.

Claims (3)

An induction heating cooker comprising an induction heating coil and a circuit board on which at least a drive circuit for supplying a high-frequency current to the induction heating coil is mounted, wherein one side of the circuit board has an outer peripheral shape of the induction heating coil In addition, the circuit board is arranged in the horizontal direction of the induction heating coil so that one side of the concave shape does not overlap with the outer periphery of the induction heating coil.
The circuit board is disposed with a surface on which a circuit component for supplying a high-frequency current is mounted on an induction heating coil including the drive circuit facing down, and a heat dissipating fin attached to an inner heat generating component of the circuit component Arranged so as to extend from below the substrate toward the bottom of the heating coil,
The heat dissipating fins are maximally enlarged in the induction heating cooker body in accordance with the size of the heating coil and arranged below the heating coil,
The induction heating cooker characterized in that the heating coil is fixed to the induction heating cooker main body through the radiating fins, and the radiating fins also serve as a support for the induction heating coil . The induction heating cooker according to claim 1 , wherein the radiating fin is in contact with a lower surface of the circuit board to support the circuit board .   A control circuit for displaying a heating state of the induction heating coil on a convex substrate on one side corresponding to the concave shape when the circuit substrate having a concave shape on one side is removed from a rectangular or square circuit substrate The induction heating cooker according to claim 1 or 2, wherein the display control board is mounted.

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