JPH07241236A - Electromagnetic induction heating rice cooker - Google Patents

Abstract

(57) [Abstract] [Purpose] It is possible to omit the use of a fan to cool electronic parts, and to make it quiet without wind noise. In addition, since there is no fan, power consumption is less and energy saving. Can also contribute. [Structure] A heat radiation fin 8 is arranged in an air flow path 7 communicating with the outside air, and a heat pipe 13 is interposed between the heat radiation fin 8 and the electronic component equipment part 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction heating (IH) [induction heating] rice cooker utilizing electromagnetic induction.

[0002]

2. Description of the Related Art An induction heating (IH) rice cooker utilizing electromagnetic induction is known to have high heating efficiency. As shown in FIG. 7, an induction heating coil 1 and this induction heating coil 1 are shown.
It is composed of a combination with the pot 2 that heats up due to the electromagnetic induction action of. Then, the induction heating coil 1 is connected to a power source through an electronic component mounting section 3 in which electronic components such as an inverter (power converter), a switch, and a timer are mounted on a board.
Reference numeral 20 is a heat shield plate interposed between the induction heating coil 1 and the electronic component equipment section 3.

A household current having a frequency of 50 or 60 hertz is once converted into a direct current by the inverter, converted into a high frequency current of 20 kilohertz or more, and the amount of current and voltage are increased.

When such a high-frequency current is passed through the induction heating coil 1 which is a circular coil to create magnetic lines of force, an overcurrent flows through the pan 2 due to electromagnetic induction, and the pan 2 has an electrical resistance, so that the inner kettle 2 itself. Heats up and rice is cooked.

Electronic component mounting unit 3 which is an electronic component mounting board
A heat sink 4, which is a heat radiation fin made of aluminum for radiating the heat of electronic components such as a transistor, is attached to this and is cooled by a fan 5.

[0006]

In the forced cooling system of the heat sink 4 by the fan 5 as described above, the wind noise from the fan 5 causes noise and makes the user uncomfortable.

An object of the present invention is to eliminate the disadvantages of the above-mentioned conventional example. First, it is possible to omit the use of a fan for cooling electronic parts, and to make it quiet without wind noise, and
It is to provide an electromagnetic induction heating rice cooker that also contributes to energy saving.

[0008]

In order to achieve the above object, the present invention firstly arranges a heat radiation fin in an air flow path communicating with the outside air, and a heat pipe is interposed between the heat radiation fin and the electronic component equipment part. Secondly, the air flow path is formed vertically in the outer case, the ventilation hole in the upper part of the outer case is an exhaust hole, and the ventilation hole in the lower part is an intake hole. Thirdly, the heat pipe. Is a bent heat pipe, fourthly, the heat radiation fins are formed in an electrically insulating state, and fifthly, a heat conductive electrical insulating material is interposed between the electronic component equipment part and the heat pipe. Is.

[0009]

According to the first aspect of the present invention, the heat generated in the electronic component mounting portion is carried to the heat radiating fin by the heat pipe and is released to the air flow path communicating with the outside air by the heat radiating fin, and cooked rice together with the heated air. Go out of the room.

According to the second aspect of the present invention, in addition to the above-mentioned action, ventilation holes are provided in both the upper part and the lower part of the outer case, thereby forming an air flow path in the vertical direction and forming a chimney effect. Thus, the heat radiation fins can be efficiently cooled by air.

According to the third aspect of the present invention, the heat dissipating fin and the electronic component mounting portion are separated from each other, and even if there is an obstacle in the path, the heat pipe can be bent to avoid it.

According to the fourth aspect of the present invention, the high voltage generated in the electronic component mounting portion is not transmitted to the heat radiation fin, and even if a wire or the like is inserted through the ventilation hole and touches the heat radiation fin by mischief. Accidents such as electric shock can be prevented.

According to the fifth aspect of the present invention, the heat pipe can be electrically insulated as in the fourth aspect, and the high voltage generated in the electronic component equipment part flows to the heat pipe. It can be prevented. As a result, even if a wire or the like is inserted through the vent hole and touches the heat pipe by mischief, an accident such as electric shock can be prevented.

[0014]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a vertical sectional side view showing an embodiment of an electromagnetic induction heating rice cooker of the present invention, FIG. 2 is a side view of an essential part of the same as above, and FIG. 3 is a sectional view taken along line AA of FIG. The same components as those shown in FIG. 7 are designated by the same reference numerals.

The electromagnetic induction heating rice cooker of the present invention also comprises an induction heating coil 1 and a combination of a pan 2 made of a magnetic material (iron or stainless steel) that generates heat by the electromagnetic induction of the induction heating coil 1. 1 has the same basic structure as that of the conventional example shown in FIG.

Reference numeral 21 in the drawing denotes a cooker main body, which is an outer case 6 made of metal or resin, an outer frame 22 made of metal, and the outer frame.
There is a bottom plate 23 made of synthetic resin provided below 22 and the pot 2 provided inside the outer frame 22 and the bottom plate 23 so as to be stored therein.

The induction heating coil 1 is brought into close contact with the lower surface of the bottom plate 23, and the outer wall of the outer frame 22 is provided with a side heater for keeping heat.
I put on 24. Further, a bottom temperature sensor 25 is provided which penetrates the central portion of the bottom plate 23 and is in close contact with the bottom of the pan 2.

In the figure, reference numeral 26 denotes a coil base for supporting the induction heating coil 1. Four to eight ferrite ferrites 27 for shielding are radially arranged on the lower surface of the coil base 26.

The electronic component mounting portion 3 is disposed in the bottom of the outer case 6 and the space 29 below the ferrite 27, and has electronic components 15 such as transistors and the heat receiving block 11 mounted on the substrate 16. Further, aluminum that shields the leakage of magnetic flux to the side of the heat insulating plate 30 and the heating coil for the purpose of insulating the heat generated from the side heaters 24 on the outside of the outer frame 22 and insulating the pan 2 to improve the heat retaining property. A shield plate 31 such as a product is provided.

A lid 32, one side of which is pivotally supported on the cooker main body 21 and the other side of which is freely engageable with the cooker main body 21, comprises a lid main body 33, a metal radiator plate 34, and an inner lid 35. Become.

Inside the outer case 6, an air passage 7 communicating with the outside air is formed outside the heat insulating plate 30 and the shield plate 31, and a heat radiating fin 8 made of aluminum which is a heat sink is arranged in the air passage 7. did. By disposing the radiating fins 8 outside the shield plate 31, it is possible to prevent the radiating fins 8 from generating heat due to magnetic induction due to leakage flux.

The air passage 7 is provided with an outer case 6 and a heat insulating plate 30.
The upper vent hole 9 and the lower shield plate 31 are formed in the vertical direction, and the upper vent hole 9 serves as an exhaust hole and the lower vent hole 10 serves as an intake hole.

On the other hand, as shown in FIGS. 2 and 3, the electronic component mounting portion 3 in which the electronic component 15 is attached to the substrate 16 is formed of copper and aluminum so as to be sandwiched between the heat receiving block 11 and the fixing plate 12. An end of a heat pipe (13) in which a working fluid such as water, Fluorinert or CFC substitute is sealed is fixed to the cylinder. At that time, the end of the heat pipe 13 is covered with an insulating sheet 14 made of silicon or the like as a heat conductive electric insulating material so as to be in an electrically insulated state. In the figure, 17 is a mounting screw.

The heat pipe as shown in FIGS.
Reference numeral 13 is a bent heat pipe, and the other end is attached to the radiation fin 8 by a fixing plate 18. This radiation fin 8
Aligns its extrusion direction with the air flow path so as not to impede the flow of air. Further, by disposing the heat pipe in a portion which is behind the ferrite when viewed from the heating coil, it is possible to prevent the heat pipe from being exposed to the magnetic flux of the heating coil and generating heat due to magnetic induction.

Due to the presence of the insulating sheet 14, the radiating fins 8 are electrically insulated from the electronic component mounting portion 3 together with the heat pipe 13, but instead of this,
Alternatively, as an additional configuration, as disclosed in JP-A-62-293655, the heat pipe 13 is connected between the heat radiating portion and the heat absorbing portion by an electrically insulating hollow insulator, and the working fluid is electrically insulated. It may be a material that can ensure an electrically insulating state.

In this way, the heat generated in the electronic component 15 of the electronic component mounting portion 3 is absorbed by the heat pipe 13 and transmitted to the radiating fin 8 to be discharged from the radiating fin 8 to the air passage 7.

As a result, an ascending air current is generated in the air flow path 7 from the ventilation hole 10 to the ventilation hole 9 by the chimney effect, and the exhaust heat from the radiation fins 8 is exhausted to the outside of the outer case 6 by this air flow.

[0028]

As described above, the electromagnetic induction heating rice cooker of the present invention can be made quiet without wind noise by omitting the use of a fan for cooling electronic components.
Also, since there is no fan, power consumption is reduced accordingly,
It can also contribute to energy saving.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing an embodiment of an electromagnetic induction heating rice cooker of the present invention.

FIG. 2 is a side view of the essential part of the same embodiment of the electromagnetic induction heating rice cooker of the present invention.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a front view showing the coupling of the electronic component equipment, the radiation fin and the heat pipe.

FIG. 5 is a side view showing the coupling of the electronic component equipment part, the radiation fin, and the heat pipe.

FIG. 6 is a plan view showing the coupling of the electronic component equipment part, the radiation fins, and the heat pipe.

FIG. 7 is a vertical sectional side view showing a conventional example.

[Explanation of symbols]

1 ... Induction heating coil 2 ... Pan 3 ... Electronic component equipment part 4 ... Heat sink 5 ... Fan 6 ... Exterior case 7 ... Air flow path 8 ... Radiating fins 9, 10 ... Vent hole 11 ... Heat receiving block 12 ... Fixing plate 13 ... Heat Pipe 14 ... Insulation sheet 15 ... Electronic component 16 ... Substrate 17 ... Mounting screw 18 ... Fixing plate 19 ... Inner case 20 ... Heat shield plate 21 ... Cooker body 22 ... Outer frame 23 ... Bottom plate 24 ... Side heater 25 ... Bottom temperature sensor 26 ... Coil base 27 ... Shield ferrite 29 ... Space 30 ... Insulation plate 31 ... Shield plate 32 ... Lid body 33 ... Lid body 34 ... Heat radiation plate 35 ... Inner lid

 ─────────────────────────────────────────────────── --- Continuation of the front page (72) Inventor Nobuo Tanigawa, Minami-Kichikata, Tottori City, Tottori Prefecture 3-chome 201, Sanyo Electric Co., Ltd. (72) Inventor Hiroshi Wakaichi Minami-Kichikata, Tottori City, Tottori Prefecture 3-chome 201 Tottori Sanyo Electric Co., Ltd. (72) Inventor Takehiro Chinen 5-11-3 Shimbashi, Minato-ku, Tokyo Sumitomo Light Metal Industries Co., Ltd. (72) Inventor Masaya Kanda 5 Shinbashi, Minato-ku, Tokyo Chome 11-3 Sumitomo Light Metal Industry Co., Ltd. (72) Inventor Yoshihiro Nishimoto 5-11-3 Shimbashi, Minato-ku, Tokyo Sumitomo Light Metal Industry Co., Ltd. (72) Inventor Kenji Yamamoto Minato-ku, Tokyo Shinbashi 5-11-3 Sumitomo Light Metal Industry Co., Ltd.

Claims (5)

[Claims] 1. An electromagnetic induction heating rice cooker characterized in that a heat radiation fin is arranged in an air flow path communicating with the outside air, and a heat pipe is interposed between the heat radiation fin and the electronic component equipment part. 2. The electromagnetic induction cooked rice according to claim 1, wherein the air flow path is formed vertically in the exterior case, and the ventilation hole in the upper part of the exterior case is an exhaust hole and the ventilation hole in the lower part is an intake hole. vessel. 3. The electromagnetic induction heating rice cooker according to claim 1, wherein the heat pipe is a bent heat pipe. 4. The electromagnetic induction heating rice cooker according to claim 1, wherein the radiation fin is formed in an electrically insulating state. 5. The electromagnetic induction heating rice cooker according to claim 1, wherein a heat conductive electric insulating material is interposed between the electronic component equipment part and the heat pipe.