JPH07100053A - Induction heating cooker - Google Patents

Abstract

PURPOSE:To enable the height of a cooker main body to be reduced the height of a heat sink. CONSTITUTION:A rice cooker 2 is placed on a protective frame 8 disposed inside a cooker main body 1, and an induction heating coil 3 that is driven by the excitation of an inverter circuit 4 is disposed on the bottom of the protective frame 8. A heat sink 6 on which the heating components of the inverter circuit 4 are mounted has an air guide 7 that extends downwards, covering an air fan 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction heating cooker used in general households.

[0002]

2. Description of the Related Art In recent years, an induction heating cooker which cooks by an induction heating system having a strong thermal power has become mainstream. Below, regarding the conventional induction heating cooker, taking an electric rice cooker as an example,
This will be described with reference to FIGS.

In FIG. 5, a rice cooker 2 for putting rice in a rice cooker body 1, a coil 3 for induction heating the rice cooker 2, an inverter circuit 4 connected to the induction heating coil 3 for generating a high frequency current, and a cooling wind. A blower fan 5 for sending air, a heat generating component of the inverter circuit 4 is attached, and a heat sink 6 for transmitting loss heat generated from the heat generating component to cooling air,
A blower guide 7 that guides the wind sucked into the main body 1 by the blower fan 5 to the heat sink 6, and a heating coil cover 8 that protects the induction heating coil 3 are provided. 6 and 7
Since 1 to 8 are the same as those in FIG. 5, their description will be omitted.

In the above structure, since a large amount of heat is lost from the induction heating coil 3 and the inverter circuit 4 during the induction heating of the rice cooking pot 2, forced cooling by the blower fan 5 is necessary. In particular, since the switching element and the like in the inverter circuit 4 generate a large amount of heat per volume, the inverter circuit 4 generally requires the heat sink 6.

The wind sucked into the main body 1 by the blower fan 5 is guided to the heat sink 6 along the blower guide 7 on the heating coil cover 8 to remove the heat loss of the inverter circuit 4 from the heat sink 6 and then the main body 1 Go out.

[0006]

However, in such a conventional induction heating cooker, since the inverter circuit 4 and the blower fan 5 are arranged in the main body 1, it can be used as another cooker type rice cooker. The height of the product is higher than that of the conventional product, which makes it difficult to store in the kitchen.

The present invention solves the above-mentioned conventional problems, and an object thereof is to realize an induction heating cooker having a low product height and excellent storability.

[0008]

In order to solve the above-mentioned problems, according to the present invention, as a first means, a blower fan is covered with a heat sink to which heat-generating components of an inverter circuit are attached.

Further, according to the present invention, as a second means, the heat sink is provided with an extending portion extending from the protective frame to the peripheral surface side of the cooker body, and the extending portion is located further than the lowest point of the protective frame. We decided to place it in a high position.

Further, according to the present invention, as a third means, the cooling fan is arranged laterally of the protective frame.

[0011]

According to the first means, most of the cooling air sent from the blowing fan hits the heat sink, and the heat-generating components attached to the heat sink are cooled.

Further, according to the second means, even if the height of the heat sink is lowered, the heat transfer capability of the heat sink is not deteriorated.

Furthermore, according to the third means, the height of the blower fan does not affect the product height.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIG.
And it demonstrates based on FIG. An electric rice cooker will be taken as an example of the induction heating cooker. In FIG. 1 and FIG. 2, a protective frame 8 is arranged in the cooker main body 1 having a lid that can be opened and closed, and a rice cooking pot 2 in which rice and water are put is placed on the protective frame 8. . A heat sensitive element is closely attached to the rice cooking pot 2 by spring bias. An induction heating coil 3 for driving the rice cooking pot 2 by induction by driving the inverter circuit 4 which generates a high frequency current is arranged at the bottom of the protection frame 8. The heat sink 6, which is arranged below the protective frame 8 and to which the heat-generating components of the inverter circuit 4 are attached, has a blower guide 7 extending downward to cover the blower fan 5.

In the above structure, the cooling air sucked into the main body 1 by the blower fan 5 is guided to the blower guide 7 and is sent to the heat sink 6. The blower guide 7 has a large wind speed and a large heat transfer amount. Therefore, a large amount of heat can be transferred before reaching the heat sink 6. Therefore, the heat sink 6, which is the remaining heat radiation portion, can be downsized and the height can be reduced. As described above, it is possible to realize an induction heating cooker having a low product height and high storability.

Next, a second embodiment of the present invention will be described with reference to FIG. In the present embodiment, the heat sink 6 secures the heat transfer capability, and the height of the portion inside the rice cooking pot 2 that influences the product height is low, so that the product height is not affected. The height of the outer portion is higher than that of the outer peripheral portion. Therefore, the product height can be made lower than in the case where the conventional heat sink is used.
As described above, it is possible to realize an induction heating cooker with high storability.

Next, a third embodiment of the present invention will be described with reference to FIG. In the present embodiment, the blower fan 5 is arranged beside the rice cooking pot 2, and the propeller of the blower fan 5 faces the side surface of the rice cooker body 1. Therefore, the blower fan 5 does not affect the product height, and the heat sink 6 is installed at the place where the blower fan is conventionally arranged.
The height of the heat sink 6 can be lowered by extending the distance. As described above, it is possible to realize an induction heating cooker having a low product height and high storability. Further, since the cooling passage of the inverter circuit 4 and the cooling passage of the induction heating coil 3 are formed independently, there is also an effect that the cooling efficiency is improved.

In the above embodiment, the rice cooker is taken as an example of the induction heating cooker, but the induction cooker is not limited to the rice cooker and any induction cooker may be used.

[0019]

As is apparent from the above description, the induction heating cooker of the present invention covers the blower fan with the heat sink to which the heat-generating components of the inverter circuit are attached, so that the cooker is operated by the operation of the blower fan. The air sucked into the main body is easily sent to the heat sink as it is. Therefore, even if the intake amount due to the operation of the heating fan is reduced, the cooling air of the amount necessary for cooling the heat generating parts of the inverter circuit can be sent to this heat sink. As a result, it is possible to reduce the height of the heat sink and thus the height of the cooker body.

When the heat sink is provided with an extending portion extending from the protective frame to the peripheral surface side of the cooker body, and the extending portion is arranged at a position higher than the lowest point of the protective frame, Even if the lower end of this heat sink is located higher than the conventional induction heating cooker, the heat transfer ability of the heat sink can be maintained, and this reduces the height of the cooker body without degrading the heat transfer ability of the heat sink. It will be possible.

When the blower fan is arranged on the side of the protective frame, the height of the blower fan does not affect the height of the cooker body, and the height of the cooker body is increased by the amount of the blower fan. Can be lowered.

[Brief description of drawings]

FIG. 1 is a side sectional view of an induction heating cooker according to a first embodiment of the present invention.

FIG. 2 is a bottom sectional view of the induction heating cooker according to the first embodiment of the present invention.

FIG. 3 is a sectional view of an induction heating cooker according to a second embodiment of the present invention.

FIG. 4 is a side sectional view of an induction heating cooker according to a third embodiment of the present invention.

FIG. 5 is a side sectional view of a conventional induction heating cooker.

FIG. 6 is a sectional view of a conventional induction heating cooker.

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

[Explanation of symbols]

 1 Main body 2 Rice cooker pot 3 Induction heating coil 4 Inverter circuit 5 Blower fan 6 Heat sink 7 Blower guide 8 Heating coil cover

Claims (3)

[Claims] 1. A protective frame which is disposed in the cooker body and places a pan, an induction heating coil which induction-heats the pan, and an inverter circuit which is disposed below the protective frame and drives the induction heating coil, An induction heating cooker comprising: a heat sink to which heat-generating components of an inverter circuit are attached; and a blower fan that is covered by the heat sink and blows cooling air to the heat sink. 2. The heat sink has an extending portion extending from the protective frame to the peripheral surface side of the cooker body, and the extending portion is arranged at a position higher than the lowest point of the protective frame. Item 1. An induction heating cooker according to item 1. 3. A protective frame which is placed in the cooker main body to mount the pan, an induction heating coil which induction-heats the pan, an inverter circuit which is arranged below the protective frame and drives the induction heating coil, An induction heating cooker comprising: a heat sink to which a heat-generating component of an inverter circuit is attached; and a blower fan that is arranged on the side of the protective frame and applies cooling air to the heat sink.