JP2000225054A - Induction heating rice cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a product compact by maximally using a space formed in a rice cooker body. SOLUTION: This induction heating rice cooker is provided with a rice cooker body 1 composed of an outer case 4 having an almost quadrangular cross section and a synthetic resin protective frame 6 having a circular cross section composed so as to house an inner iron pot 5, and an operation panel part 7 is arranged in an upper place of the outer case 4. In this case, a power source base board 27 provided with various electronic parts is arranged in a lower position of the operation panel part 7 in a space part 8 formed between the outer case 4 and the protective frame 6, and the power source base board 27 is integrally mounted with a heat sink 30 for promoting heat radiation from the power source base board 27 and a cooling fan 31 for cooling the heat sink 30 to integrate the power source base board 27, the heat sink 30 and the cooling fan 31.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic rice cooker, and more particularly, to an electromagnetic rice cooker whose external dimensions are as small as possible.

[0002]

2. Description of the Related Art An electromagnetic induction coil generates an eddy current in an inner pot made of a magnetic material stored in a rice cooker body, and uses the resistance heat generated by the eddy current as a heating means. Instruments are well known in the art.

In the electromagnetic rice cooker having the above-described configuration, a heat sink and a cooling fan for cooling electronic components (for example, a power transistor) disposed on a power supply board are indispensable components. The external dimensions of the product depend on how it is stored and arranged in the container body.

In a conventional electromagnetic rice cooker, a power supply board, a heat sink, and a cooling fan have been separately arranged. For example, a configuration has been adopted in which a power supply board and a heat sink are disposed in a front space of a rice cooker main body, and a cooling fan is disposed at an inner bottom portion of the rice cooker main body.

[0005]

In the above prior art, since the power supply board, the heat sink, and the cooling fan are separately arranged, a predetermined distance is provided between the power supply board, the heat sink, and the cooling fan. As a result, the height of the product increases accordingly, and the external dimensions of the product may increase depending on the position of the cooling fan.

[0006] The present invention has been made in view of the above points, and aims to reduce the size of a product by maximally and effectively using a space formed in a rice cooker main body. is there.

[0007]

According to the first aspect of the present invention, an outer case having a substantially rectangular cross section and an inner pot made of a magnetic material can be housed as means for solving the above problems. A rice cooker main body constituted by a synthetic resin protective frame having a circular cross section, a lid of the rice cooker main body, and an eddy current to the inner pot located outside the protective frame. An electromagnetic rice cooker comprising: an electromagnetic induction coil to be generated; and an electromagnetic rice cooker having an operation panel unit provided at an appropriate position above the outer case. A power supply board on which various electronic components are arranged is provided at a lower position, and a heat sink for promoting heat radiation from the power supply board and a cooling fan for cooling the heat sink are integrated with the power supply board. Typically Ri wearing.

With the above-described structure, the power supply board, the heat sink, and the cooling fan are integrated, and the height of the product can be reduced.

As in the invention of claim 2, claim 1
In the electromagnetic rice cooker described above, when the operation panel section is provided on the front side of the outer case, the operability of the operation panel section is improved, and the space for placing the product is small.

[0010] As in the invention of claim 3, claim 1
In the electromagnetic rice cooker according to any one of claims 2 and 3, when a concave portion for accommodating a lower portion of the cooling fan is formed in a bottom portion of the outer case, the lower portion of the cooling fan can be accommodated in the concave portion. Thus, the height of the product can be further reduced.

[0011] As in the invention of claim 4, claim 1
4. The electromagnetic rice cooker according to claim 3, wherein the heat sink and the cooling fan are housed in a concave portion formed at a lower portion of the power supply board, and are mounted in a state orthogonal to a board surface of the power supply board. 5. In this case, the heat sink and the cooling fan can be attached to the power supply board so as to be overlapped and perpendicular to the board surface, and the height and outer shape of the product can be further reduced.

As in the invention of claim 5, claim 4
In the electromagnetic rice cooker according to the above, when the portion of the heat sink facing the protection frame has a shape following the outer peripheral shape of the protection frame, it is possible to arrange the heat sink and the protection frame as close as possible. Further, the outer shape of the product can be further reduced.

As in the invention of claim 6, claim 4
The electromagnetic rice cooker according to any one of claims 5 to 6, wherein a portion of the cooling fan on the side of the protection frame is close to the electromagnetic induction coil between ferrite cores radially arranged below the electromagnetic induction coil. In this case, the cooling fan and the electromagnetic induction coil can be arranged as close to each other as possible, and the outer shape of the product can be further reduced.

As in the invention of claim 7, claim 1
In the electromagnetic rice cooker according to any one of claims 6 to 6, when the width of the wind receiving surface of the heat sink is substantially equal to the rotation diameter of the cooling fan, the total amount of cooling air from the cooling fan is reduced. Since the heat sink is hit, the heat radiation from the heat sink can be efficiently performed.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Some preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

First Embodiment FIGS. 1 to 4 show an electromagnetic rice cooker according to a first embodiment of the present invention.

As shown in FIGS. 1 and 2, the electromagnetic rice cooker comprises an outer case 4 having a substantially square cross section constituting an outer peripheral surface, and an inner pot comprising an inner peripheral surface and made of a magnetic material. , A rice cooker main body 1 composed of a protective frame 6 made of synthetic resin having a circular cross section and configured to be able to store therein, a lid 2 of the rice cooker main body, and an outer periphery of the protective frame 6 And an electromagnetic induction coil 3 for generating an eddy current in the inner pot 5 located on the side. here,
The term “substantially square shape” is a generic term for a square shape having rounded corners, a horseshoe shape having an arc portion on one side, a shape having an arc portion on two opposite sides, and the like.

The outer case 4 includes a body 4a serving as a side peripheral surface of the rice cooker main body 1, a shoulder 4b serving as a joint between an upper end edge of the protection frame 6, and a bottom part of the rice cooker main body 1. In the present embodiment, the body 4a and the shoulder 4b are made of an integrally molded product made of synthetic resin, and the bottom 4c is a separate body. In some cases, the body 4a and the bottom 4c are formed of an integrally molded product made of synthetic resin, and the shoulder 4b is formed as a separate body.

The upper part of the front side of the body 4a of the outer case 4 is gently inclined, and an operation panel 7 is provided at the portion. Therefore, a relatively large front space portion 8 is formed below the operation panel portion 7 between the outer case 4 and the protection frame 5. The operation panel unit 7 is provided with various operation switches and a liquid crystal display unit that displays a setting state set by the various operation switches. An operation board 9 is provided inside the operation panel section 7.
Are arranged. The operation board 9 is fixed to the outer case body 4a by a screw 14 with a screw 14 so as to be substantially parallel to the operation panel section 7 in an inclined state.
It is supported by.

The protective frame 6 has a bottomed cylindrical shape, and has a gentle curved surface 6c from the side peripheral surface 6a to the bottom surface 6b.

On the back surface of the bottom surface 6b and the curved surface 6c of the protective frame 6, annular electromagnetic induction coils 3 are provided, respectively. The electromagnetic induction coils 3 and 3 are connected to a coil die 10 and a protection frame 6, which are coupled at the lower surface of the central portion of the protection frame bottom surface 6 b and extend radially along the protection frame 6.
Are positioned in a state of being sandwiched between them. That is, the electromagnetic induction coils 3 and 3 have a shape following the outer peripheral surface shape of the protection frame 6. Reference numeral 11 denotes a radially extending ferrite core supported on the lower surface of the central portion of the coil die 10 (see FIG. 2), and has a function of blocking magnetism downward. Reference numeral 12 denotes a center sensor that functions as temperature detecting means for detecting the temperature of the inner pot 5, and reference numeral 13 denotes a heat retaining heater.

A shoulder ring 16 made of synthetic resin is attached to the inner peripheral edge of the shoulder portion 4b of the outer case 4 with a screw (not shown).
A metal heater ring 18 having a shoulder heater 17 is attached. As will be described later, the outer peripheral edge of the inner lid 45 attached to the lower surface of the lid 2 is pressed against the upper surface of the heater ring 18 when the lid 2 is closed.

A hanging wall 16a is formed integrally with an inner peripheral portion of the shoulder ring 16 to extend to an upper edge of the protection frame 6. The hanging wall 16a and the upper edge of the protection frame 6 are integrally formed. An air passage 19 is formed between the rim and the rim. The air passage 19 communicates with a gap S formed between the protective frame 6 and the inner pot 5 through a vent 20 formed in the hanging wall 16a.

An inner pan cooling fan 22 is provided at the center of a rear space 21 formed between the rear side of the outer case 4 and the rear side of the protective frame 6. Cooling air from the cooling fan 22 is supplied to the air passage 19 through the duct 23, and is supplied to the gap S from the ventilation port 20 to cool the outer peripheral surface of the inner pot 5. The cooling of the inner pot 5 is performed, for example, during a period from the completion of cooking to the transition to the target heat retaining temperature or at a predetermined time when it is judged necessary during the heat retaining process. Reference numeral 55 denotes an air suction port.

A code reel 24 is provided vertically at one corner of the rear space 21 as shown in FIGS. The code reel 2
4 is attached to a cord reel cover 52 fixed to the outer case bottom 4c by screws 51, and the power cord 25 is pulled out rearward from an opening 26 formed in the outer case bottom 4c. Has become. Further, a concave portion 53 for positioning the lower end of the code reel 24 is formed in the outer case bottom portion 4c, and a rib integrally suspended from the protection frame 6 is formed on the upper surface of the front code reel cover 52. 54 are in contact therewith, whereby the code reel 24 is stably fixed.

At a position below the operation panel 7 in the front space 8 formed between the outer case 4 and the protection frame 6, a power supply board 27 on which various electronic components are arranged is vertically arranged. It is arranged in a posture. The power supply board 27
Is mounted on a substrate holder 28 which is mounted to the shoulder 4b of the outer case 4 by screws (not shown) in a vertical position, protrudes downward from the substrate holder 28 by a predetermined dimension, and the protrusion 27a A concave portion 29 is formed in the center of the notch. The reason for doing this is
Since the mounting area of the electronic component on the power supply board 27 is reduced by the amount corresponding to the formation of the concave portion 29,
This is to secure by a.

A heat sink 30 for promoting heat radiation from the power supply board 27 and a cooling fan 31 for cooling the heat sink 30 are integrally attached to the power supply board 27. By doing so, the power supply board 27
In addition, the heat sink 30 and the cooling fan 31 are integrated, and the height of the product can be reduced.

The heat sink 30 and the cooling fan 31 are housed in a concave portion 29 formed in the projecting portion 27a of the power supply board 27 and are attached in a state perpendicular to the substrate surface of the power supply board 27. The mounting pieces 32, 3
The power supply board 27 is attached by fixing the mounting pieces 32, 32 to both side edges of the concave portion 29 of the power supply board 27 with screws 33. The cooling fan 31 is attached so that the front side is short and the rear side is long about the power supply board 27.

The wind receiving surface 30a of the heat sink 30
Is inclined downward toward the protection frame 6, and the cooling fan 31 is oriented in such a manner as to be along the wind receiving surface 30 a of the heat sink 30 (that is, inclined downward toward the protection frame 6). Are integrated with each other by bolts 33. The width D of the wind receiving surface 30a of the heat sink 30 is substantially the same as the rotation diameter R of the cooling fan 31 (see FIG. 3). By doing so, the heat sink 3
0 and the cooling fan 31 are arranged close to each other, the entire amount of the cooling air W from the cooling fan 31
In this case, the heat radiation from the heat sink 30 can be efficiently performed.

By the way, the height a of the cooling fan 31
1 and the dimension b1 in the front-rear direction are set in advance so as to secure the capacity, and the protective frame 6 and the outer case bottom 4
c, the height dimension a3 of the bottom space 56 formed between
Ferrite core 1 provided below electromagnetic induction coil 3
1 is limited to be slightly larger than the gap between the lower surface of 1 and the protective frame 6, and the front-rear space portion 8 also has a front-rear dimension b2 in the front-rear direction.
Since the size of the rice cooker main body 1 cannot be increased in order to make it compact, the dimensional relationships are a1> a3 and b1> b2.

Therefore, the cooling fan 31 as described above
In the case of the mounting structure described above, the rear side of the cooling fan 31 projecting below the power supply board 27 interferes with the bottom 4c of the outer case 4. Therefore, in the present embodiment, the outer case bottom 4c is formed with a recess 34 for accommodating a lower portion of the cooling fan 31. The distance between the recess 34 and the protective frame 6 is a2
Then, a1 <a2. The recess 34 is
It is necessary to prevent the rice cooker main body 1 from projecting below the support legs 35. That is, the recess 34 is formed by effectively utilizing the gap formed between the ground surface of the support leg 35 and the outer case bottom 4c. This way,
The heat sink 30 and the cooling fan 31 can be attached to the power supply board 27 so as to be overlapped and perpendicular to the substrate surface, and the lower part of the cooling fan 31 can be stored in the recess 34, so that the height of the product can be reduced. Can be made more compact. Reference numeral 36 denotes an air inlet formed in the outer case bottom 4c.

The heat sink 30 has a curved surface 30b formed at a position facing the protective frame 6 so as to follow the outer peripheral shape of the protective frame 6 (that is, the curved surface 6c). With this configuration, the heat sink 30 and the protective frame 6 can be arranged as close as possible, and the outer shape of the product can be further reduced.

The portion of the cooling fan 31 on the side of the protective frame 6 is brought close to the electromagnetic induction coil 3 between the ferrite cores 11, 11... (See FIG. 2). The gap between the cooling fan 31 and the electromagnetic induction coil 3 is 1 to 3 in consideration of compactness and performance.
mm. In this way, the cooling fan 31 and the electromagnetic induction coil 3 can be arranged as close as possible, and the outer shape of the product can be made more compact.

The upper end of the substrate holder 28 on which the power supply substrate 27 is mounted is as close as possible to the substrate holder 15 on which the operation substrate 9 is mounted. In this case, the height of the product can be further reduced.

On the other hand, the lid 2 is pivotally supported on the rear part of the outer case shoulder 4b (that is, on the opposite side of the operation panel 7) through a hinge unit 44 so as to be openable and closable and detachable. It comprises an upper plate 37 made of synthetic resin constituting the upper surface, and a vacuum double structure 38 constituting the lower surface. At the center of the upper plate 37, a screw tube 39 having a screw portion 39a on the outer periphery is integrally formed, while at the center of the vacuum double structure 38, a through hole into which the screw tube 39 is inserted is formed. 4
0 is formed. And the vacuum double structure 38
Is mounted by screwing a screw ring 41 to the screw cylinder 39 in a state where the screw cylinder 39 is inserted into the through hole 40.

A pressure adjusting cylinder 42 is detachably attached to the screw cylinder 39. Reference numeral 43 denotes a pressure adjusting cylinder 42
Is a pressure adjusting cap detachably provided to cover an upper part of the pressure regulating cap.

At the lower end of the pressure adjusting cylinder 42, an inner lid 45, whose outer peripheral edge is pressed against the upper surface of the heater ring 18 when the lid 2 is closed, is attached by a screw 46. The inner lid 45 is made of a thermally conductive metal, and functions as a heat radiating plate that is heated by heat conduction from the shoulder heater 17 attached to the heater ring 18. Reference numeral 47 denotes a seal packing attached to the inner lid 45, which is pressed against the rim of the inner pan 5 when the lid 2 is closed to seal the inside of the inner pan 5.

A support rod 48 is provided at the lower end of the pressure regulating cylinder 42.
Are detachably attached via a seal packing 50. The heat radiating plate 49 is made of a thermally conductive metal having a diameter slightly smaller than the opening diameter of the inner pot 5, and is positioned slightly below the opening edge of the inner pot 5 when the lid 2 is closed. Has become. In this way, the heat from the shoulder heater 17 is transmitted to the inner lid 45 via the heater ring 18,
The radiant heat from the inner lid 45 is indirectly transmitted to the radiator plate 49 via the space between the inner lid 45 and the radiant plate, and further radiated from the radiator plate 49 to the cooked rice in the inner pot 5. Become. Therefore, the cooked rice is uniformly and softly heated, so that it is possible to appropriately keep the temperature of the cooked rice without causing browning or the like.

In the above description, the operation board, the power supply board, the heat sink, and the cooling fan are arranged in the front space portion of the rice cooker main body. However, these components are replaced with other space in the rice cooker main body. (For example, a rear space portion).

Second Embodiment FIG. 5 shows an electromagnetic rice cooker according to a second embodiment of the present invention.

In this case, a code storage portion 57 for storing the power cord 25 of the code reel 24 is formed in the outer case bottom 4c located below the rear space 21. The cord storage portion 57 is formed by recessing a portion of the outer case bottom 4c immediately below the inner pan cooling fan 22 upward, and has an upper wall 57a and an inner side wall 5c.
An air inlet 55 is formed in 7b. An air suction port 55 is also formed in a portion of the outer case bottom 4c adjacent to the cord storage portion 57. In this case, the cord storage section 5 for storing the power cord 25 is provided.
The air suction port 55 can be formed by using the upper wall 57a and the side wall 57b. The other configuration and operation and effect are the same as those in the first embodiment, and thus the description is omitted.

Third Embodiment FIG. 6 shows a structure for mounting a cord reel in an electromagnetic rice cooker according to a third embodiment of the present invention.

In this case, a fixing member 58 made of a synthetic resin having an inverted U-shaped cross section is attached to the upper end of the cord reel 24 by forcible fitting, and a prism-shaped member integrally formed on the upper surface of the fixing member 58. Of the outer case shoulder 4b
After being temporarily fixed by inserting it into a square hole 59a formed in a boss 59 which is integrally suspended from the lower surface of the cord reel 24 and connecting the cord reel 24, the lower end of the code reel 24 is
The outer case bottom 4c is fixed by being sandwiched between a guide rib 60 and an anti-rattle rib 61 formed integrally with the outer case bottom 4c. The lower end of the rib 62 formed on the side surface of the code reel 24 faces a positioning recess 63 formed on the outer case bottom 4c. That is, the cord reel 24 is sandwiched and fixed from above and below by the outer case shoulder 4b and the outer case bottom 4c. In this way, the attachment of the code reel 24 is easy and reliable. The other configuration and operation and effect are the same as those in the first embodiment, and thus the description is omitted.

Fourth Embodiment FIG. 7 shows a structure for mounting a cord reel in an electromagnetic rice cooker according to a fourth embodiment of the present invention.

In this case, the upper end of the code reel 24 is
After being temporarily fixed by inserting it into a pair of fixing ribs 64, 64 which are integrally provided from the lower surface of the outer case shoulder 4b and connecting the cord reel 24, the lower end of the code reel 24 is connected to the outer case bottom 4c. And is fixed by being sandwiched between a fixing rib 65 and a resin spring 66 which are formed integrally. The lower end of the rib 62 formed on the side surface of the cord reel 24 faces a positioning hole 67 formed on the outer case bottom 4c. In other words, the cord reel 24 has the outer case shoulder 4b and the outer case bottom 4c.
Thus, the sandwich is fixed from above and below. In this way, the attachment of the code reel 24 is easy and reliable. The other configuration and operation and effect are the same as those in the first embodiment, and thus the description is omitted.

[0046]

According to the first aspect of the present invention, an outer case having a substantially rectangular cross section and a synthetic resin having a circular cross section configured to accommodate an inner pot made of a magnetic material are accommodated. A rice cooker main body constituted by a protective frame, a lid of the rice cooker main body, and an electromagnetic induction coil positioned outside the protective frame to generate an eddy current in the inner pot, and the outer case is provided. In an electromagnetic rice cooker provided with an operation panel section at an appropriate position above, various electronic components are arranged at a position below the operation panel section in a space formed between the outer case and the protection frame. A power supply board is provided, and a heat sink for promoting heat radiation from the power supply board, and a cooling fan for cooling the heat sink are integrally attached to the power supply board, and the power supply board and the heat sink are cooled. Since the § emission was set to be integrated structure, there is an effect that it is possible to compact the height of the product.

As in the invention of claim 2, claim 1
In the electromagnetic rice cooker described above, when the operation panel section is provided on the front side of the outer case, the operability of the operation panel section is improved, and the space for placing the product is small.

As in the invention of claim 3, claim 1
In the electromagnetic rice cooker according to any one of claims 2 and 3, when a concave portion for accommodating a lower portion of the cooling fan is formed in a bottom portion of the outer case, the lower portion of the cooling fan can be accommodated in the concave portion. Thus, the height of the product can be further reduced.

As in the invention of claim 4, claim 1
4. The electromagnetic rice cooker according to claim 3, wherein the heat sink and the cooling fan are housed in a concave portion formed at a lower portion of the power supply board, and are mounted in a state orthogonal to a board surface of the power supply board. 5. In this case, the heat sink and the cooling fan can be attached to the power supply board so as to be overlapped and perpendicular to the board surface, and the height and outer shape of the product can be further reduced.

As in the invention of claim 5, claim 4
In the electromagnetic rice cooker according to the above, when the portion of the heat sink facing the protection frame has a shape following the outer peripheral shape of the protection frame, it is possible to arrange the heat sink and the protection frame as close as possible. Further, the outer shape of the product can be further reduced.

As in the invention of claim 6, claim 4
The electromagnetic rice cooker according to any one of claims 5 to 6, wherein a portion of the cooling fan on the side of the protection frame is close to the electromagnetic induction coil between ferrite cores radially arranged below the electromagnetic induction coil. In this case, the cooling fan and the electromagnetic induction coil can be arranged as close to each other as possible, and the outer shape of the product can be further reduced.

As in the invention of claim 7, claim 1
In the electromagnetic rice cooker according to any one of claims 6 to 6, when the width of the wind receiving surface of the heat sink is substantially equal to the rotation diameter of the cooling fan, the total amount of cooling air from the cooling fan is reduced. Since the heat sink is hit, the heat radiation from the heat sink can be efficiently performed.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an electromagnetic rice cooker according to a first embodiment of the present invention.

FIG. 2 is a bottom view showing a cross section of a part of the electromagnetic rice cooker according to the first embodiment of the present invention.

FIG. 3 is an enlarged view of a main part of the electromagnetic rice cooker according to the first embodiment of the present invention.

FIG. 4 is a large cross-sectional view of a cord reel disposing portion of the electromagnetic rice cooker according to the first embodiment of the present invention.

FIG. 5 is a longitudinal sectional view of an electromagnetic rice cooker according to a second embodiment of the present invention.

FIG. 6 is an enlarged sectional view of a main part showing a structure for mounting a cord reel in an electromagnetic rice cooker according to a third embodiment of the present invention.

FIG. 7 is an enlarged sectional view of a main part showing a mounting structure of a cord reel in an electromagnetic rice cooker according to a fourth embodiment of the present invention.

[Explanation of symbols]

1 is a rice cooker main body, 2 is a lid, 3 is an electromagnetic induction coil, 4 is an outer case, 5 is an inner pot, 6 is a protective frame, 7 is an operation panel section,
8 is a space (front space), 11 is a ferrite core, 2
7 is a power supply board, 29 is a recess, 30 is a heat sink, 30
a is a wind receiving surface, 30b is a curved surface, 31 is a cooling fan,
Numeral 34 denotes a depression, D denotes the width of the wind receiving surface, and R denotes the rotation diameter of the cooling fan.

Claims (7)

[Claims] 1. A rice cooker comprising an outer case having a substantially rectangular cross section and a synthetic resin protection frame having a circular cross section configured to accommodate an inner pot made of a magnetic material. A cooker main body, a lid of the rice cooker main body, and an electromagnetic induction coil that is located outside the protection frame and generates an eddy current in the inner pan, and an operation panel unit is provided at an appropriate upper part of the outer case. An electric rice cooker comprising: a power supply board on which various electronic components are arranged; and a space formed between the outer case and the protection frame, below the operation panel. Along with the power supply board,
An electromagnetic rice cooker, wherein a heat sink for promoting heat radiation from the power supply board and a cooling fan for cooling the heat sink are integrally mounted. 2. The electromagnetic rice cooker according to claim 1, wherein the operation panel is provided on a front side of the outer case. 3. The electromagnetic rice cooker according to claim 1, wherein a recess for accommodating a lower portion of the cooling fan is formed in a bottom of the outer case. . 4. The power supply board according to claim 1, wherein the heat sink and the cooling fan are housed in a recess formed in a lower portion of the power supply board and are mounted in a state perpendicular to a board surface of the power supply board. The electromagnetic rice cooker according to claim 3. 5. The electromagnetic rice cooker according to claim 4, wherein a portion of the heat sink facing the protection frame has a shape following the outer peripheral shape of the protection frame. 6. The cooling fan according to claim 4, wherein a portion of the cooling fan closer to the protective frame is located between the ferrite cores radially arranged below the electromagnetic induction coil and close to the electromagnetic induction coil. An electromagnetic rice cooker according to claim 5. 7. The electromagnetic rice cooker according to claim 1, wherein a width of a wind receiving surface of the heat sink is substantially equal to a rotation diameter of the cooling fan. .