JPH08222365A - Induction heating cooker - Google Patents

Abstract

PURPOSE: To enhance cooling and thermal efficiencies. CONSTITUTION: A fan device 32 for cooling heating parts in a main body case 21 comprises a fan 34 that is an axial fan and a motor 35, both of which are mounted in a fan casing 33 having openings 33a, 33b, 33c respectively through its upper and lower sides and one side. A heat insulating material 42 is placed between a heating coil 28 and a top plate 24 in order to reduce heat transfer from the top plate 24 to the heating coil 28, and a blocking portion 43 for blocking the upper-side opening 33a of the fan casing 33 is provided integral with the heat insulating material 42. Air sucked into the fan casing 33 by the blowing action of the fan 34 is fed out exclusively from the side opening 33c into the main body case 21 as cooling air, by which the heating parts are cooled. The cooling air is not directly applied to the top plate 24.

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 provided with a heating coil for inductively heating an object to be heated such as a pot placed on a top plate.

[0002]

2. Description of the Related Art An example of an induction heating cooker of this type is shown in FIGS. 3 and 4, a main body case 1 of the induction heating cooker is configured by combining a lower case 2, an upper case 3 and a top plate 4. Inside the main body case 1, a heating coil 5 for induction heating having a coil base 5a, and various electric components 6 constituting an electric circuit for supplying high-frequency power to the heating coil 5 are mounted on a print. A wiring board 7, a heat dissipation plate 8 of a switching element such as a power transistor, which is a part of the electric parts 6 that requires heat dissipation, and the like are arranged, and these are interposed between the heating coil 5 and the top plate 4. A heat insulating material 9 for insulating the space is provided.

A fan device 10 for cooling the heating coil 5, the printed wiring board 7, the heat radiating plate 8 and the like is arranged at a corner of the main body case 1. This fan device 10 has openings 11a, 1 on both upper and lower surfaces and side surfaces.
A fan 12 having a tubular C-shaped cross section having 1b and 11c, and an axial fan (propeller fan) arranged in the fan casing 11.
And a motor 13 that rotationally drives the fan 12. An intake port 14 is formed on the bottom of the lower case 2 of the main body case 1 corresponding to the lower surface opening 11b of the fan casing 11, and an exhaust port 15 is provided on the outer periphery of the lower case 2 away from the intake port 14. Has been formed.

In this structure, when the fan 12 of the fan device 10 is rotated, the air blown by the fan 12 causes the air outside the main body case 1 to move toward the intake port 14 and the fan as shown by an arrow A in FIG. The air is sucked into the fan casing 11 through the lower surface opening 11b of the casing 11, and the air is sucked into the upper surface opening 11 of the fan casing 11.
The air is sent as cooling air into the main body case 1 through a and the side opening 11c, and then discharged from the exhaust port 15. At this time, the heating coil 5, the printed wiring board 7, the radiator plate 8 and the like are cooled by the cooling air flowing in the main body case 1.

[0005]

However, the structure described above has the following drawbacks. That is, most of the air sucked into the fan casing 11 from the lower surface opening 11 b of the fan casing 11 has a large amount.
Since it is sent out upward from the la 1a and hits the top plate 4 and the upper case 3 to be diffused into the main body case 1, most of the cooling wind is on the back surface of the top plate 4 and the heating coil 5.
It will flow along the outer surface of the. For this reason, it is difficult for the cooling air to hit the heat-generating components such as the radiator plate 8 and the printed wiring board 7 which originally need to be cooled, and the cooling efficiency is poor. Moreover, since the cooling air directly impinges on the top plate 4 which should not be cooled originally, the heat of the pot etc. on the top plate 4 is taken away with the decrease of the temperature of the top plate 4 and the thermal efficiency is lowered. There is also the drawback of allowing it.

[0006] Therefore, an object of the present invention is to provide an induction heating cooker capable of improving cooling efficiency and thermal efficiency.

[0007]

In order to achieve the above-mentioned object, an induction heating cooker of the present invention has a main body case having a top plate, and is disposed in the main body case and mounted on the top plate. A heating coil for inductively heating an object to be heated such as a placed pan, a fan casing provided in the main body case with openings formed on both upper and lower surfaces and side surfaces, and an axial fan provided in the fan casing. A fan device configured to cool a heat-generating component including the heating coil disposed in the main body case by a blowing action of the fan, and a portion of the main body case corresponding to the lower surface opening of the fan casing. It is arranged so as to insulate the space between the heating coil and the top plate from the provided intake port and the exhaust port provided at a site apart from the intake port. Both have a said closing portion for closing the upper opening of the fan casing was constructed having a heat insulating material having integrally.

In this case, it is preferable that the main body case is provided with a pressing portion for pressing the closed portion toward the fan casing. Moreover, it is preferable that the heat insulating material has a flexible structure.

[0009]

According to the above means, since the upper opening of the fan casing in the fan device is closed by the closing portion of the heat insulating material, the air is blown into the fan casing from the lower opening of the fan casing by the blowing action of the fan. The air (cooling air) is exclusively sent out from the side opening of the fan casing into the main body case.
Therefore, the cooling air can be efficiently blown to the heat-generating components to be cooled in the main body case, and it is possible to prevent the cooling air from directly hitting the upper top plate. And in this case,
Since the closing portion is integrally provided with the heat insulating material, the number of parts does not increase.

In the case where the main body case is provided with the pressing portion for pressing the closing portion toward the fan casing side, the opening portion on the upper surface of the fan casing can be closed more reliably by the closing portion. Moreover, when the heat insulating material has flexibility, even if there is a step between the upper surface of the heating coil where the heat insulating material is arranged and the upper end of the fan casing where the closed portion is arranged. The upper opening of the fan casing can be reliably closed.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will now be described with reference to FIGS.
Will be described with reference to. Induction heating cooker body case 21
Has a circular shape as a whole by combining a circular lower case 22, an upper case 23, and a top plate 24. Of these, the upper case 2
An operation panel 25 is disposed on the outer peripheral portion of the upper surface of 3.
The operation panel 25 is provided with various switch keys 26 and a display 27 for displaying heating output and the like.

A heating coil 28 for induction heating having a circular coil base 28a is arranged in the center of the upper part of the main body case 21 so as to face the top plate 24.
Further, in the lower part of the main body case 21, a printed wiring board 30 on which various electric parts 29 constituting an electric circuit for supplying high-frequency power to the heating coil 28 are mounted, and particularly heat dissipation of the electric parts 29 A heat dissipation plate 31 of a switching element such as a power transistor, which is a necessary component, is arranged. Here, the heating coil 28 and the electric component 29
The printed wiring board 30 on which is mounted and the heat dissipation plate 31 constitute a heat generating component, and these components need to be cooled.

A fan device 32 for cooling the heat generating component is provided at a corner of the main body case 21. The fan device 32 includes a fan casing 33 having a C-shaped cross section having openings 33a, 33b, 33c on both upper and lower surfaces and a side surface, and an axial fan (propeller fan) arranged in the fan casing 33. ), And a motor 35 that rotationally drives the fan 34. Fan casing 33
Is arranged so that the side surface opening 33c faces the central portion side in the main body case 21.

An intake port 36 composed of a plurality of holes is formed in the bottom portion of the lower case 22 of the main body case 21 corresponding to the lower surface opening 33b of the fan casing 33, and the lower case 22 separated from the intake port 36. An exhaust port 37 including a plurality of holes is formed in the outer peripheral portion. Further, a socket 40 for detachably connecting a magnet plug 39 provided at one end of the power supply cord 38 is provided at a portion of the outer periphery of the lower case 22 that is farthest from the fan device 32. At the other end of the power supply cord 38, a plug 41 for connecting to a power outlet
Is provided.

In the main body case 21, between the top plate 24 and the heating coil 28, in order to make it difficult for the heat on the top plate 24 side to be transferred to the heating coil 28 side, a flexible material such as glass wool is used. The sheet-shaped heat insulating material 42 is provided. The heat insulating material 42 is integrally provided with a closing portion 43 extending toward the fan casing 33, and the closing portion 43 closes the upper opening 33a of the fan casing 33. Block 4
3 is pressed from above by the pressing portion 44 provided in the upper case 23 of the main body case 21 to the fan casing 33 side.

In this case, although there is a step H between the upper surface of the heating coil 28 where the heat insulating material 42 is arranged and the upper end of the fan casing 33 where the closing portion 43 is arranged, the heat insulating material 42 is flexible. Therefore, the upper surface opening 33a of the fan casing 33 can be reliably closed by the closing portion 43.

In the above structure, when the fan 34 of the fan device 32 is rotated, the air blown by the fan 34 causes the air outside the main body case 21 to move toward the intake port 36 and the fan as shown by the arrow B in FIG. The air is sucked into the fan casing 33 through the lower surface opening 33b of the casing 33.
Here, since the upper opening 33a of the fan casing 33 is closed by the closing portion 43 of the heat insulating material 42, the air (cooling air) sucked into the fan casing 33 is exclusively the side opening 33c of the fan casing 33. Will be sent from the inside of the main body case 21. The cooling air sent into the main body case 21 cools the heating coil 28, the printed wiring board 30, the heat dissipation plate 31, and the like, which are heat-generating components, and then is discharged from the exhaust port 37 to the outside of the main body case 21.

According to the embodiment described above, the fan device 32
Since the upper opening 33a of the fan casing 33 is closed by the closing portion 43 of the heat insulating material 42, the air sucked into the fan casing 33 from the lower opening 33b of the fan casing 33 by the blowing action of the fan 34 (cooling). The wind) is sent exclusively from the side surface opening 33c of the fan casing 33 toward the inside of the main body case 21. Therefore, the cooling air can be efficiently blown to the heat-generating components to be cooled in the main body case 21, and the heat-generating components can be efficiently cooled. Further, since it is possible to prevent the cooling air from directly hitting the upper top plate 24, it is possible to cool the top plate 24 and, by extension, the object to be heated (not shown) such as a pan placed on the top plate 24. It can be prevented as much as possible. Moreover, in this case, the blocking portion 43
Since it is provided integrally with the heat insulating material 42, the number of parts does not increase.

Further, according to the above-mentioned embodiment, since the upper case 23 is provided with the pressing portion 43 for pressing the closing portion 43 toward the fan casing 33 side, the upper opening 33a of the fan casing 33 is closed. By doing so, it is possible to more reliably close. Further, since the heat insulating material 42 has flexibility, a step H is formed between the upper surface of the heating coil 28 where the heat insulating material 42 is arranged and the upper end of the fan casing 33 where the closing portion 43 is arranged. Even if there is
The upper opening 33a of the fan casing 33 can be reliably closed.

The present invention is not limited to the above-mentioned embodiments, and for example, the main body case 21 is not limited to a circular shape, but may be a rectangular shape. Can be carried out.

[0021]

According to the present invention, since the upper opening of the fan casing in the fan device is closed by the closing portion of the heat insulating material, it is sucked into the fan casing by the blowing action of the fan composed of the axial fan. The air (cooling air) can be efficiently blown from the side opening of the fan casing to the heat-generating component to be cooled in the main body case, and the heat-generating component can be efficiently cooled. Further, since it is possible to prevent the cooling wind from directly hitting the upper top plate, it is possible to prevent the top plate and, in turn, the heated object such as the pan placed on the top plate from being cooled, The thermal efficiency can also be improved. Moreover, in this case, since the closed portion is provided integrally with the heat insulating material, the number of parts does not increase.

Further, in the case where the main body case is provided with the pressing portion for pressing the closing portion toward the fan casing, the opening portion on the upper surface of the fan casing can be closed more reliably by the closing portion.

Further, when the heat insulating material has a flexible structure, there is a step between the upper surface of the heating coil where the heat insulating material is arranged and the upper end of the fan casing where the closed portion is arranged. Even in this case, the upper opening of the fan casing can be reliably closed.

[Brief description of drawings]

FIG. 1 is a longitudinal side view showing one embodiment of the present invention.

FIG. 2 is a cutaway plan view.

FIG. 3 is a view corresponding to FIG. 1 showing a conventional configuration.

FIG. 4 is a view corresponding to FIG.

[Explanation of symbols]

Reference numeral 21 is a main body case, 24 is a top plate, 28 is a heating coil (heating component), 30 is a printed wiring board (heating component), 31 is a radiator plate (heating component), 32 is a fan device,
33 is a fan casing, 33a is a top opening, 33b
Is a lower surface opening, 33c is a side opening, 34 is a fan, 3
5 is a motor, 36 is an intake port, 37 is an exhaust port, 42 is a heat insulating material, 43 is a closed part, and 44 is a holding part.

Claims (3)

[Claims] 1. A main body case having a top plate, a heating coil disposed in the main body case for inductively heating an object to be heated such as a pot placed on the top plate, and the main body case. The heating unit is provided with a fan casing having openings on both upper and lower sides and side faces and a fan including an axial fan provided in the fan casing. A fan device for cooling a heat-generating component including a coil; an intake port provided in a portion of the main body case corresponding to the lower surface opening of the fan casing; and an exhaust port provided in a portion apart from the intake port, The heating coil and the top plate are arranged so as to be insulated from each other, and a closing portion for closing the upper opening of the fan casing is integrally provided. Induction heating cooker comprising comprises a heat insulating material that. 2. The induction heating cooker according to claim 1, wherein the main body case is provided with a holding portion for holding the closed portion toward the fan casing. 3. The induction heating cooker according to claim 2, wherein the heat insulating material has flexibility.