JPH0611621U - Electromagnetic rice cooker - Google Patents

Abstract

(57) [Summary] [Purpose] In an electromagnetic rice cooker using electromagnetic induction heating,
Make the overall structure simple and have a structure that retains heat well. [Structure] The entire outer side of an inner container 23 for housing a rice cooker 26 is covered with an inner case 35 made of resin. A protrusion is provided on a side portion of the inner case 35, and the electric circuit board 37 is attached thereto. A baffle plate 40 is attached to the bottom of the inner case 35. Electric elements to be cooled, such as a power transistor 41 and a diode bridge circuit 43, are arranged in the baffle plate 40. Then, the cooling air is blown by the fan 46 to the baffle plate 4.
0 to efficiently cool these electric elements to be cooled. [Effect] The rice cooker 26 and the inner container 2 by the inner case 35
The heat insulation effect of No. 8 can be improved, and the electric circuit board 37 can be attached to the side part of the electromagnetic rice cooker by utilizing the empty space.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an electromagnetic rice cooker that heats a rice cooker by high frequency electromagnetic induction.

[0002]

[Prior art]

 An electromagnetic rice cooker using high frequency electromagnetic induction heating is known. FIG. 3: is sectional drawing which shows the constructional example of the conventional electromagnetic rice cooker. Referring to FIG. 3, the main body 1 of the electromagnetic rice cooker has a cylindrical cover member 2 made of a thin metal plate forming an outer surface thereof, an inner container 3 forming an inner side thereof, and a cover member 2 Shoulder member 4 that connects the upper edge of the inner container 3 to the upper edge of the inner container 3 to form the shoulder of the main body 1, and the bottom member that is fitted to the lower edge of the cover member 2 to form the bottom of the main body 1. 5 and 5.

The inner container 3 includes a lower inner container 6 that constitutes a bottom portion and a lower side portion, and an upper inner container 8 that is connected to the lower inner container 6 with a screw 7 and forms an upper portion. The lower inner container 6 is made of, for example, a resin so as not to receive high frequency electromagnetic induction. On the other hand, the upper inner container 8 is made of a metal plate such as aluminum having good thermal conductivity. The reason for this is that the heat of the heat retention heater 9 attached to the outer peripheral surface of the upper inner container 8 is efficiently transmitted to the rice cooker 10 via the upper container 8.

A heat insulating material 17 is housed in the space between the upper inner container 8 and the cover member 2 so that the heat of the heat retention heater 9 does not escape to the outside. A sensor arranging hole 11 is formed substantially at the center of the bottom of the lower inner container 6, and a sensor unit 12 is housed therein. Around the sensor placement hole 11, a rice cooking coil 13 is arranged along the lower surface of the bottom of the lower inner container 6. The rice cooking coil 13 is arranged on a coil base 14 which also serves as a ferrite core, and the coil base 14 is attached to the lower inner container 6 with screws 15.

A removable rice cooker 10 is housed in the inner container 3 including the lower inner container 6 and the upper inner container 8. The rice cooker 10 is made of, for example, thick iron or stainless steel so as to be easily subjected to high-frequency electromagnetic induction heating. When the rice cooker 10 is correctly housed in the inner container 3, the bottom of the rice cooker 10 contacts the upper surface of the sensor unit 11. When high frequency power is supplied to the rice cooking coil 13, the high frequency magnetic field generated by the rice cooking coil 13 passes through the lower inner container 6 to generate an eddy current in the rice cooker 10, and the eddy current causes the rice cooker 10 to generate heat. To do.

Further, a lid unit 16 that can be opened and closed is provided on the top of the main body 1 of the electromagnetic rice cooker.

[0007]

[Problems to be solved by the device]

 Since the conventional electromagnetic rice cooker is configured as described above, it has a drawback that the structure of the inner container 3 is complicated, the number of parts is large, and the assembly is troublesome. Further, there is a problem that the increase in the number of parts causes not only the trouble of assembling but also the strength of the inner container 3 as a whole.

However, the inner container 3 is a member for housing the rice cooker 10 as described above, and it is necessary to support the rice cooker 10 when the rice cooker 10 is housed. The rice cooker 10 has a considerable weight in consideration of the weight of the rice contained therein. Therefore, it is not preferable to reduce the strength of the inner container 3, and in the above-mentioned conventional apparatus, the structure of the resin lower inner container 6 and the screw 7 connecting the lower inner container 6 and the upper inner container 8 should be weight-resistant. It was necessary to increase the thickness and use a large one.

Further, the heat of the heat retention heater 9 is transferred to the upper inner container 8 to heat the rice cooker 10. However, since the upper contents container 8 does not cover the lower part of the rice cooker 10, the lower part of the rice cooker 10 is heated at the time of heat retention. There was also the drawback that temperature unevenness would occur and the heat retention performance would deteriorate. Further, the space between the upper container 8 and the cover member 2 must be filled with the heat insulating material 17, and there is a drawback that it takes time to fill the heat insulating material 17.

Further, in order to prevent the high frequency magnetic field generated by the rice cooking coil 13 from leaking out from below or below the electromagnetic rice cooker body 1, the lower and lower parts of the coil base 14 are covered with a magnetic field shield plate or the like. I also had to cover it. It is an object of the present invention to provide an electromagnetic rice cooker that eliminates the drawbacks of the prior art, has a simple structure, and has good heat retention performance.

[0011]

[Means for Solving the Problems]

 This invention is an electromagnetic rice cooker that heats a rice cooker by high-frequency electromagnetic induction, which has an inner container for housing the rice cooker, and the inner container is entirely made of metal such as aluminum or copper having a low electric resistance. A rice cooking coil for heating the rice cooker by high-frequency electromagnetic induction is installed on the bottom surface inside the inner container, and the entire outer side of the inner container is covered with an inner case made of synthetic resin. It is characterized by being described.

Further, in the invention, in the electromagnetic rice cooker, a circuit board mounting protrusion for mounting a circuit board of the rice cooker is formed on the outer peripheral surface of the inner case, and the mounting protrusion is used. It is characterized in that a circuit board is attached. Furthermore, in the invention, in the electromagnetic rice cooker, a lower air guide plate is attached to a lower side of a bottom surface of an inner case, and a power element for controlling energization of the rice cooker coil is provided in the air guide plate. And its heat dissipation mechanism is arranged.

[0013]

[Action]

 According to this invention, since the rice cooking coil for heating the rice cooker is installed on the bottom surface inside the inner container, the high frequency magnetic field generated by the rice cooker coil is effectively transmitted to the bottom of the rice cooker and swirled in the rice cooker. An electric current is generated and the rice cooker is heated. On the other hand, the high-frequency magnetic field generated by the rice cooking coil is generated only inside the metal inner container and is prevented from leaking to the outside by the metal inner container.

Since the entire outside of the inner container is covered with the inner case made of synthetic resin, the inner case acts as a heat insulating material, so that the heat retaining effect of the inner container and the rice cooker housed therein is improved. . According to another aspect of the present invention, a board mounting protrusion is provided on the outer surface of the inner case or the like, and the circuit board can be mounted using the protrusion. That is, since the circuit board can be mounted at a predetermined position of the inner case, the mounting position of the circuit board can be set relatively freely as in the conventional case without being limited to the position below the inner space, and the empty space Effective use can be achieved.

Further, according to another aspect of the present invention, since the baffle plate can be attached to the lower surface of the inner case, the baffle plate can be easily attached and the assembling workability is improved. Further, the inner container is made of metal and integrally formed, and unlike the prior art, the resin lower inner container and the metal upper inner container are not connected by screws, but their strength is sufficient. Very expensive. Moreover, since the inner container is made of metal, which has a small electric resistance, the inner container itself is hardly heated by the eddy current due to the high frequency electromagnetic induction. The inner container has a simple structure and is easy to assemble. Furthermore, when a heat insulation heater is attached to the outer peripheral surface of the metal inner container, the heat generated by the heat insulation heater spreads to the entire metal inner container and the outside is covered by the inner case, so heat to the outside Has been cut off. Therefore, the electromagnetic rice cooker having a good heat retaining effect can be obtained.

[0016]

【Example】

 An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a sectional view of the essential part of the left half showing a characteristic configuration of an electromagnetic rice cooker according to an embodiment of the present invention. Referring to FIG. 1, a main body 21 of the electromagnetic rice cooker according to this embodiment includes a cylindrical cover member 22 made of a thin metal plate forming an outer surface thereof and an inner container forming an inner side thereof. 23, a shoulder member 24 that connects the upper edge of the cover member 22 and the upper edge of the inner container 23 to form the shoulder of the main body 21, and the shoulder member 24 that is fitted to the lower edge of the cover member 22 and And a bottom member 25 forming a bottom. A removable rice cooker 26 is housed in the inner container 23.

The inner container 23 is, for example, an aluminum plate and has a bottomed cylindrical shape integrally formed from the upper part to the lower part. The inner container 23 may be a copper plate or another metal plate instead of the aluminum plate, and may be integrally formed of a material having a small electric resistance. When the inner container 23 is integrally molded with such a metal plate having a small electric resistance, its strength is high, and sufficient strength and reliability for accommodating and holding the rice cooker 26 can be obtained. Moreover, it is easy to assemble. Further, the high frequency electromagnetic induction does not cause the inner container 23 itself to generate heat abnormally.

A rice cooking coil unit 29 is installed on the bottom surface inside the inner container 23. The rice cooking coil unit 29 includes a coil die 30 made of, for example, a resin, a rice cooking coil 31 arranged along the lower surface of the coil die 30, and a rice cooking coil 31 from below so as not to be affected by high frequency electromagnetic induction. And a holding member 39 for holding. A ferrite core 44 for focusing magnetic flux is sandwiched between the holding member 39 and the bottom surface of the inner container 23. The rice cooking coil unit 29 is attached to the bottom of the inner container 23 by screws 32.

Further, the coil die 30 is provided with a sensor mounting box 28 which is integrally formed. A sensor receiving hole 27 is formed at the center of the bottom of the inner container 23, and a sensor mounting box 28 is fitted in the receiving hole 27. Therefore, the coil unit 29 and the sensor mounting box 28 can be set together on the inner bottom surface of the inner container 23, and there is an advantage that the assembly is easy.

Further, the rice cooking coil unit 29 is arranged on the bottom surface inside the inner container 23 as described above. Therefore, the high frequency magnetic field generated by the rice cooking coil 31 appears only inside the inner container 23. That is, the high frequency magnetic field is shielded by the metallic inner container 23, and the magnetic field does not leak to the outside of the inner container 23. A heat insulation heater 34 is attached to the outer surface of the inner container 23 so as to surround the inner container 23. The heat generated by the heat-retaining heater 34 is efficiently transferred to the metallic inner container 23, and the entire inner container 23 is heated to evenly heat the rice cooker 26 contained therein. Therefore, a good heat retention state can be maintained.

In addition, in the conventional structure, since only the upper inner container 8 (see FIG. 3) is heated, the heat retention heat is difficult to be transmitted to the bottom portion of the rice cooker 10 and the bottom temperature of the rice cooker 10 tends to decrease. . According to this embodiment, there is no such drawback. Further, in this embodiment, the entire outer side of the inner container 23 is covered with the resin inner case 35. When the inner case 35 is provided, the entire outer side of the inner case 23 is covered with the inner case 35. Therefore, even if the inner container 23 is heated by the heat retaining heater 34, the heat of the inner case 23 does not escape to the outside. It is effectively kept warm at 35. Therefore, the conventional heat insulating material 17 (see FIG. 3) can be eliminated.

Further, protrusions 36 are formed on the bottom and side portions of the resin inner case 35. The electric circuit board 37 is attached with screws 38 by using the protrusions 36. In this way, the inner case 35 is provided, and the electric circuit board 37 is attached using the inner case 35. Therefore, the electric circuit board 37 necessary for the electromagnetic rice cooker is used as the inner container 23. It can be attached by utilizing an empty space between the cover member 22 and the cover member 22.

In particular, if the electric circuit board 37 is attached to the side of the inner case 35, the entire electromagnetic rice cooker can be installed as compared with the conventional electromagnetic rice cooker in which the electric circuit board is provided in the lower portion. The height can be kept low, and the electromagnetic rice cooker can have a preferable shape in terms of design. Further, since the heat of the inner container 23 is hardly transmitted to the outside of the inner case 35, the electric circuit board 37 attached to the inner case 35 does not have a bad influence due to the heat (for example, characteristic change of the electronic circuit). .

FIG. 2 is a sectional view of an essential part for explaining the configuration of an electromagnetic rice cooker according to another embodiment of the present invention. In the electromagnetic rice cooker shown in FIG. 2, an electric circuit board 37 is attached to the side of the inner case 35, and a baffle plate 40 is attached to the bottom of the inner case 35. Further, among the electric elements provided in the electromagnetic rice cooker, the elements that need to be cooled in the wind guide plate 40, that is, the power transistor 41 for controlling the rice cooking coil, the heat dissipation plate 42 of the power transistor 41, and the diode. The bridge circuit 43 and the radiation plate 44 of the diode bridge circuit are arranged. This is the feature of this embodiment.

More specifically, the air guide plate 40 is, as the name implies, a guide plate for guiding the flow of cooling air. The baffle plate 40 is attached to the bottom surface of the inner case 35 by screws 38. In FIG. 2, a cooling air intake port 45 is formed on the lower left side of the baffle plate 40, and a fan 46 is provided corresponding to the intake port 45. When the fan 46 rotates, the cooling air is taken into the baffle plate 40 from the intake port 45, and the cooling air is guided by the ribs (not shown) provided in the baffle plate 40. In FIG. Air that has undergone heat conversion and has been warmed is discharged from an air discharge outlet 47 formed on the lower right side of 40.

As described above, the elements to be cooled in the electromagnetic rice cooker, that is, the power control power transistor 41 of the rice cooking coil 31, the heat dissipation plate 42 of the power transistor, the diode bridge circuit 43, and the heat dissipation plate 44 of the diode bridge circuit are If the cooling air is introduced into the baffle plate 40 by the fan 46 arranged in the baffle plate 40, the cooling can be performed very efficiently. Further, the cooling air taken in by the fan 46 only circulates in the baffle plate 40 and does not hit the side of the inner case 35 or the inner container 23 at all, so that the heat retaining effect of the rice cooker 26 decreases. Nothing.

As described above, when only the electric elements to be cooled are arranged at predetermined places, and the electric elements to be cooled are surrounded by the baffle plate 40, and the cooling air is circulated in the baffle plate 40, The electric element to be cooled can be efficiently cooled, and the rice cooker 26 to be kept warm in the electromagnetic rice cooker is not adversely affected by the cooling, and can be an electromagnetic rice cooker having good performance as a whole.

The other configurations are similar to those of the embodiment of FIG. 1, and the same parts are denoted by the same reference numerals and the description thereof is omitted here. This invention is not limited to the embodiment shown in FIGS. 1 and 2 described above, but can be variously modified based on the configuration described in the claims.

[0029]

[Effect of device]

 Since the present invention is configured as described above, it can be an electromagnetic rice cooker having a relatively simple structure and good heat retention. Also, the electric circuit board can be attached to the inner case surrounding the outside of the inner container, and the electric circuit board can be attached by effectively utilizing the empty space. Moreover, since the heat generated by the inner container is blocked by the inner case, the electric circuit board mounted outside the inner case can operate well without being affected by the heat.

Further, a baffle plate can be attached to the lower side of the inner case, and by disposing an electric element or the like for cooling in the baffle plate, it is possible to effectively cool the electric element. . Further, when the baffle plate is provided, the cooling air circulates only inside the baffle plate, so that the inner container, the rice cooker, etc. are not cooled, and the electromagnetic rice cooker having a good heat retaining effect can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of a left half for explaining a characteristic configuration of an electromagnetic rice cooker according to an embodiment of the present invention.

FIG. 2 is a sectional view of an essential part for explaining a characteristic configuration of an electromagnetic rice cooker according to another embodiment of the present invention.

FIG. 3 is a cross-sectional view for explaining the structure of a conventional electromagnetic rice cooker related to the present invention.

[Explanation of symbols]

 21 Main body of electromagnetic rice cooker 23 Inner container 26 Rice cooker 29 Rice cooker coil unit 31 Rice cooker coil 34 Heat insulation heater 35 Inner case 36 Protrusion 37 Electric circuit board 40 Wind guide plate 46 Fan

Claims (3)

[Scope of utility model registration request] 1. An electromagnetic rice cooker for heating a rice cooker by high-frequency electromagnetic induction, comprising an inner container for accommodating the rice cooker, and the inner container is entirely made of metal such as aluminum or copper having a low electric resistance. A rice cooking coil for heating the rice cooker by high-frequency electromagnetic induction is installed on the bottom surface inside the inner container, and the entire outer side of the inner container is covered with an inner case made of synthetic resin. An electromagnetic rice cooker characterized by being used. 2. The electromagnetic rice cooker according to claim 1, wherein an outer peripheral surface of the inner case is formed with a circuit board mounting projection for mounting a circuit board of the rice cooker, and the mounting projection is used. A circuit board is attached. 3. The electromagnetic rice cooker according to claim 1 or 2, wherein a lower air guide plate is attached to the lower side of the bottom surface of the inner case, and the energization of the rice cooker coil is controlled in the air guide plate. A power element and a heat dissipation mechanism for the power element.