JP6516647B2 - rice cooker - Google Patents

Description

  The present invention relates to a rice cooker in which a non-metallic inner pot is heated by a heating means to cook rice.

Conventionally, there is a rice cooker using a non-metallic inner pot. In this rice cooker, the inner case itself, which is also a protective frame, is formed of a high heat resistant member made of ceramic or the like made of crystallized glass, and the inner case is a member disposed outside the inner case, a control element, etc. The electric component is configured to be protected from radiant heat from the heating means provided on the lower side of the inner pot (see, for example, Patent Document 1).
Also, as another rice cooker, a ring-shaped collar portion is provided on the outer peripheral portion of the inner pot, and the inner pot and the inner case are mounted by placing the collar portion on the pot holder of the inner case and storing the inner pot. There is also a type in which the space between them is a closed space, and the portion below the buttocks of the inner pot is uniformly heated.

JP 2007-228999 A

  In the rice cooker described in Patent Document 1, the temperature of the space between the inner pot and the inner case is high, and in the rice cooker in which the sealed space is formed, the temperature in the sealed space is high. For this reason, the material of the inner case has to be formed of a high heat resistant member, for example, a ceramic or the like, which results in cost increase. In addition, since the inner pot is made of nonmetal, it has a problem that the heat storage property is very high and it is difficult to cool, and the heating control becomes difficult.

  This invention was made in order to solve the above subjects, and it aims at providing the rice cooker which can suppress the temperature of the hot air in enclosed space.

  The rice cooker according to the present invention is a rice cooker having a rice cooker main body having an inner case inside, a non-metallic inner pot which is removably housed in the inner case, and a heating means for heating the inner pot. The hook portion formed in a ring shape is provided on the outer peripheral portion of the inner hook, and the hook receiving portion on which the hook portion of the inner hook is mounted is provided on the inner peripheral portion of the inner case. A closed space is formed between the inner hook and the inner case when placed on the hook receiving portion of the case, provided at a lower position of the hook receiving portion of the inner case, and the inner hook is formed by the heating means. The heating device is provided with a heat discharging means for discharging the heat to the outside of the inner case according to the temperature of the heat generated in the sealed space when being heated.

  According to the present invention, when the inner pot is heated by the heating means, the heat discharging means is provided for discharging the hot air to the outside of the inner case according to the temperature of the hot air generated in the closed space. The heat discharging means can suppress an increase in the surface temperature of the inner case due to the heat radiation from the inner pot. Therefore, an inexpensive material with low heat resistance can be applied as the material of the inner case. Moreover, since the temperature of the inner pot is also easily cooled, the followability of the heating control of the heating means is improved, and the rice cooking performance can be improved.

It is explanatory drawing of the rice cooker which concerns on Embodiment 1 of this invention. It is an expanded sectional view of the heat removal means shown to the rice cooker of FIG. FIG. 7A is a cross-sectional view and a top view of a heat exhaust hole showing a modification of the first embodiment. It is a schematic diagram of the rice cooker which concerns on Embodiment 2 of this invention.

Embodiment 1
FIG. 1 is an explanatory view of a rice cooker according to Embodiment 1 of the present invention. The left side in FIG. 1 will be described as the front side of the rice cooker, and the right side will be the rear side of the rice cooker.
In FIG. 1, a rice cooker main body 1 (hereinafter simply referred to as “main body 1”) of a rice cooker has an outer frame 2 having a cylindrical side surface and an upper frame 3 fixed to an upper portion of the outer frame 2. , And a lower frame 4 fixed to the lower part of the outer frame 2 and forming a bottom plate 19 of the main body 1. The bottom plate 19 is provided with two legs 24 for supporting the main body 1 at the front and the back respectively.

  Inside the main body 1, there is provided an inner case 6 constituted of a cylindrical inner heat shielding plate 5a and a substantially deep bowl shaped coil base 5b disposed under the inner heat shielding plate 5a. It is done. At the upper end portion of the coil base 5b of the inner case 6, a hook receiving portion 5c extending outward is formed. Further, a heat discharging means 17 is provided at a lower position of the hook receiving portion 5 c facing the power supply substrate 12 in the inner case 6.

The inner pot 8 is formed into a cylindrical shape with a bottom, for example, from a non-metallic carbon material or a clay material similar to a clay pot, and the inner surface is treated with a surface treatment, for example, a fluorine coating. It is done. The inner pot 8 is a container having a very high heat storage property because it is formed of a carbon material or a clay material. When the inner pot 8 is formed of a carbon material, since the carbon material is a magnetic material, heating by electromagnetic induction is possible as it is.
When the inner pot 8 is formed of the same clay material as the clay pot, the clay material is a nonmagnetic material, so heating by electromagnetic induction is impossible as it is. Therefore, a silver film having a thickness of about 10 to several tens of microns, which is a magnetic material, is formed on the bottom of the inner pot 8 and the surface of the curved portion facing the induction heating coil 10 to enable induction heating of the inner pot 8. Is attached. The upper surface of this silver screen is protected by covering it with glaze. When the body heater 9 is formed of an induction heating coil, a silver film having a thickness of about 10 to several tens of microns, which is a magnetic material, is similarly attached to the surface of the inner kettle 8 opposite to the body heater 9. In addition, it can change to a silver screen and can also use thin metal members, such as other metals, for example, iron, or magnetic stainless steel (SUS430).
The inner hook 8 is provided with a ring-shaped flange portion 8 a molded integrally with the inner hook 8 at the central outer periphery of the side surface portion. The hook portion 8 a is placed on the hook receiving portion 5 c when the inner hook 8 is accommodated in the inner case 6. Further, when the inner hook 8 is accommodated in the inner case 6, a sealed space 7 is formed between the lower portion of the flange portion 8 a of the inner hook 8 and the inner case 6.

A body heater 9 is attached in close contact with the outer peripheral surface of the inner heat shield plate 5a. The body heater 9 is energized at the time of rice cooking and heat retention to generate heat. The body heater 9 may be comprised of an induction heating coil. When the inner pot 8 is made of a carbon material, the side surface of the inner pot 8 is inductively heated by the alternating magnetic field from the induction heating coil. When the inner pot 8 is formed of the same clay material as the pot, the silver screen provided on the side surface of the inner pot 8 is inductively heated by the alternating magnetic field from the induction heating coil, and the heat causes the side surface of the inner pot 8 Is heated.
Moreover, the induction heating coil 10 which is a heating means is wound and fixed to the outer surface (bottom part and corner part) of the inner case 6. The induction heating coil 10 generates an alternating magnetic field by energization, and the inner pot 8 formed of a carbon material is heated as it is by electromagnetic induction. In the inner pot 8 formed of a clay material, the silver film, which is a magnetic material, is heated by electromagnetic induction, and the inner pot 8 is heated by the heat. Further, a temperature sensor 11 is provided at the center of the inner case 6 so as to contact the bottom of the inner hook 8 to detect the temperature of the inner hook 8.

  A power supply board 12 is installed inside the front side of the main body 1. The power supply substrate 12 is fixed to a substrate holder (not shown) disposed on the solder surface (rear surface) side. Further, the power supply substrate 12 is covered by a substrate holder and a protective cover 14. The power supply substrate 12 is mounted with a switching element 13 for supplying power to the induction heating coil 10 and other electronic components. Further, a radiator 15 with the switching element 13 in contact is attached to the aforementioned power supply substrate 12.

  The radiator 15 has a plurality of radiation fins 15a aligned at regular intervals. The plurality of heat dissipating fins 15a are formed of an aluminum alloy having good thermal conductivity. The cooling fan 18 is installed below the radiation fin 15a.

  When the cooling fan 18 is rotating, for example, external air is sucked from the air inlet 16 provided in the bottom plate 19 on the front side of the main body 1 and passes between the radiation fins 15a. Then, the air flows out into the main body 1 from a vent (not shown) provided on the front surface of the protective cover 14. The air that has flowed out into the main body 1 flows to the bottom side of the main body 1 and passes between the inner case 6 and the bottom plate 19 to cool the induction heating coil 10 etc. and provided on the bottom plate 19 on the rear side of the main body 1 It is discharged from the exhaust port 20 to the outside of the rice cooker.

  Above the protective cover 14, an inclined operation board attachment portion 21 is installed. An operation board 22 is attached to the operation board attachment portion 21. The operation board 22 is mounted with a microcomputer (not shown) including a control unit for controlling energization of the body heater 9 and the induction heating coil 10, and other electronic components. Further, above the operation board 22, an operation panel 23 provided with a selection button such as a menu and a switch such as a rice cooking button is provided.

  A lid 25 supported openably and closably by a hinge 26 is provided at the upper portion of the main body 1. The lid 25 includes an outer lid 25a and an inner lid 25b removably mounted on the lower side of the outer lid 25a. When the upper opening of the inner case 6 of the main body 1 is closed, the lid 25 is engaged by the locking button 27 It is stopped. A packing 28 formed in a ring shape of, for example, silicone rubber is attached to the peripheral edge portion of the lower surface of the inner lid 25 b. When the lid 25 is closed, the inner lid 25 b covers the opening of the inner hook 8 and seals the opening of the inner hook 8 with the packing 28. On the upper part of the lid 25, a cartridge 29 communicating with the inner lid 25b is removably mounted. This toner cartridge 29 is configured to separate the toner and steam generated in the inner pot 8 at the time of rice cooking, and discharge the steam outward.

Next, the configuration of the above-described heat discharging means 17 will be described using FIG. FIG. 2 is an enlarged sectional view of the heat discharging means of the rice cooker shown in FIG.
In FIG. 2, the heat discharging means 17 is fixed to the outside of the inner case 6 with a plurality of heat discharging holes 17 b provided at a lower position of the kettle receiving portion 5 c facing the power supply substrate 12 in the inner case 6. The opening and closing plate 17a opens and closes the plurality of heat discharge holes 17b, and the sealing material 17c is provided on the surface of the opening and closing plate 17a facing the plurality of heat discharge holes 17b.

  The opening and closing plate 17a is made of, for example, a shape memory alloy, and the shape is deformed to be in a vertical state when the temperature is lower than a preset temperature, and when the temperature is higher than the temperature, the original shape is obtained. It is set to return. That is, when the heat from the plurality of heat discharge holes 17b reaches a high temperature equal to or higher than the set temperature, the opening and closing plate 17a inclines toward the power supply substrate 12 as shown in FIG. 2 and opens the plurality of heat discharge holes 17b. Further, when the heat from the plurality of heat discharge holes 17b becomes equal to or lower than the set temperature, the shape is deformed to be in the vertical state, and the plurality of heat discharge holes 17b are closed via the sealing material 17c.

  For example, four heat exhaust holes 17 b are provided in the vertical direction. The sealing material 17c is formed of, for example, silicone rubber. The heat discharge holes 17 b can be closed in a sealed state by the sealing material 17 c.

  In the rice cooker configured as described above, at the time of rice cooking, the inner pot 8 is heated by the alternating magnetic field from the induction heating coil 10 and the temperature of the inner pot 8 rises, and between the inner pot 8 and the inner case 6 The temperature of the air in the enclosed space 7 of the When the inner pot 8 is made of the same clay material as the clay pot, the silver layer is heated by the alternating magnetic field from the induction heating coil 10, so that the inner pot 8 is heated and the temperature of the inner pot 8 rises. The temperature of the air in the enclosed space 7 between 8 and the inner case 6 also rises. Hot air due to temperature rise is transmitted to the opening and closing plate 17a through the plurality of heat discharge holes 17b to heat the opening and closing plate 17a. By this heating, when the temperature of the opening and closing plate 17a is further raised and the temperature of the opening and closing plate 17a becomes equal to or higher than the set temperature, the opening and closing plate 17a is deformed as shown in FIG. The hole 17b is opened.

Due to the opening of the plurality of heat discharge holes 17b, the hot air in the sealed space 7 whose temperature has risen flows out from the plurality of heat discharge holes 17b, and the hot air flowed out is an air flow flowing to the outside of the inner case 6 by the cooling fan 18. It is attracted by this and discharged from the exhaust port 20 to the outside. Then, the temperature of the hot air flowing from the plurality of heat discharge holes 17b to the opening and closing plate 17a is lowered by the end of the rice cooking, and when the temperature of the hot air becomes equal to or lower than the set temperature, the opening and closing plate 17a becomes vertical and the sealing material A plurality of heat exhaust holes 17b are closed via 17c.
Although the example in which the opening and closing plate 17a is opened and closed by the shape memory alloy is described here, any structure may be used as long as it opens and closes at a temperature, and the invention is not limited to the shape memory alloy.

As described above, according to the first embodiment, when the heat air from the plurality of heat discharge holes 17b reaches a temperature higher than the set temperature, the plurality of heat discharge holes 17b are opened, and the heat air from the plurality of heat discharge holes 17b When the temperature becomes equal to or lower than the set temperature, an open / close plate 17a is provided which is deformed in shape and closes the plurality of heat discharge holes 17b via the sealing material 17c.
With this configuration, it is possible to suppress an increase in the surface temperature of the inner case 6 due to the heat radiation from the inner pot 8. Therefore, an inexpensive material with low heat resistance can be applied as the material of the inner case 6.
In addition, since the temperature of the inner pot 8 formed of a carbon material having a high heat storage property or the same clay material as that of the clay pot also cools easily, the followability of the heating control by induction heating is improved and the rice cooking performance can be improved. .

  In the first embodiment, it has been described that four heat discharge holes 17b are provided at a lower position of the hook receiving portion 5c of the inner case 6, but the heat discharge holes 17b may be one. good.

  Furthermore, a weir 17 d may be provided above one heat discharge hole 17 b closest to the pot receiving portion 5 c among the plurality of heat discharge holes 17 b. The weir 17 d protrudes to the inside of the inner case 6 as shown in FIG. FIG. 3 is a cross-sectional view and a top view of a heat discharge hole showing a modification of the first embodiment. The weir 17 d shown in the drawing is provided so as to project to the inside of the inner case 6 in the inner case 6 above the heat discharge hole 17 b described above. The weir 17 d is formed to cover the remaining heat discharge holes 17 b when viewed from the inside of the inner case 6.

  As described above, since the weir 17 d is provided above the one heat discharging hole 17 b closest to the kettle receiving portion 5 c among the plurality of heat discharging holes 17 b, water is released from the inner lid 25 b by opening and closing the lid 25. When the liquid such as the liquid spills inside the inner case 6, the liquid does not flow out of the inner case 6 from any of the four heat discharge holes 17b.

Second Embodiment
FIG. 4 is a schematic view of a rice cooker according to Embodiment 2 of the present invention. The same parts as in the first embodiment are denoted by the same reference numerals.
In the second embodiment, in the bottom plate 19 of the main body 1, the air inlet 31, for example, two first and second exhausts are provided at a position different from the position where the power supply substrate 12 of the induction heating coil 10 is disposed. Ports 32, 33 and a cooling fan 18 for sucking outside air from an air inlet 31 are provided. Moreover, the 1st heat discharge means 171 is provided in the position of the back side of the rice cooker among the inner cases 6, and also the 2nd heat discharge means 172 is carried out on both sides of the inner case 6 centering on the 1st heat discharge means 171. And third heat discharging means 173 are provided. The cooling fan 18 is provided separately from the cooling fan 18 shown in FIG.

  Similar to the first embodiment, the first heat discharging means 171, the second heat discharging means 172, and the third heat discharging means 173 described above include a plurality of heat discharging holes 17b provided in the inner case 6, and the inner case 6 The opening / closing plate 17a is fixed to the outside of the opening / closing plate 17a for opening and closing the plurality of heat discharge holes 17b, and the sealing material 17c provided on the surface facing the plurality of heat discharge holes 17b of the opening / closing plate 17a. The opening and closing plate 17a is formed of a shape memory alloy as described above, and the shape is deformed to be in a vertical state when the temperature in the enclosed space 7 is lower than a preset set temperature. It is set to return to its original shape when the temperature inside it becomes higher than the set temperature.

At the time of rice cooking, outside air is sucked from the air inlet 31 by the driven cooling fan 18 and fed to both sides and the lower side of the inner case 6, and the outside of the inner case 6 is cooled. On the other hand, the temperature rise of the inner pot 8 heated by the alternating magnetic field from the induction heating coil 10 raises the temperature of the air in the enclosed space 7. When the inner pot 8 is made of the same clay material as the clay pot, the silver layer is heated by the alternating magnetic field from the induction heating coil 10, so that the inner pot 8 is heated and the temperature of the inner pot 8 rises. The temperature of the air in the enclosed space 7 between 8 and the inner case 6 also rises.
The heat generated by the temperature rise is transmitted to the respective opening and closing plates 17a through the plurality of heat discharging holes 17b of the first heat discharging means 171, the second heat discharging means 172 and the third heat discharging means 173 to heat each opening and closing plate 17a. Do. By this heating, when the temperature of each opening and closing plate 17a further rises and the temperature of each opening and closing plate 17a becomes equal to or higher than the set temperature, each opening and closing plate 17a returns to its original shape and opens the plurality of heat discharge holes 17b. .

  At this time, the air from the cooling fan 18 flows into the plurality of heat discharge holes 17 b of the first heat discharge means 171 and flows in the sealed space 7 as indicated by the arrows in the drawing. The air that has flowed into the enclosed space 7 flows out from the plurality of heat discharge holes 17 b of the second heat discharge means 172 together with the heat and flows out from the plurality of heat discharge holes 17 b of the third heat discharge means 173.

  The hot air that has flowed out is attracted by the air flow flowing to the outside of the inner case 6 by the cooling fan 18 and is discharged to the outside from the first exhaust port 32 and the second exhaust port 33, respectively. Then, the temperature of the heat flowing from each of the plurality of heat discharge holes 17b to each opening / closing plate 17a is lowered by the end of the rice cooking, and when the temperature of the heat becomes below the set temperature, the first heat discharge means 171, the second The respective opening / closing plates 17a of the heat discharging means 172 and the third heat discharging means 173 are in a vertical state, and close the plurality of heat discharging holes 17b via the sealing material 17c.

  As described above, according to the second embodiment, the first heat discharging means 171 is provided in the inner case 6 near the cooling fan 18, and the second heat discharging means 172 and the third heat discharging are provided on both sides of the inner case 6. Means 173 are provided. With this configuration, the first heat discharging means 171 introduces the outside air by the drive of the cooling fan 18, and the second and third heat discharging means 172, 173 discharges the heat air in the enclosed space 7 together with the outside air. The air can be discharged to the outside from the second exhaust ports 32 and 33, respectively. For this reason, the exhaust heat efficiency is improved, and it is possible to prevent hot air from flowing to the power supply substrate 12 side.

  In the second embodiment, although the set temperatures of the opening and closing plates 17a of the first, second and third heat discharging means 171, 172 and 173 are the same, the setting temperature of the opening and closing plate 17a of the first heat discharging means 171 is The set temperature may be set higher than the set temperatures of the opening and closing plates 17a of the second and third heat discharging means 172, 173. In this case, the opening and closing plates 17 a of the second and third heat discharging means 172 and 173 open faster than the opening and closing plate 17 a of the first heat discharging means 171, and the heat in the sealed space 7 can be discharged.

  In addition, the set temperature of the open / close plate 17a of any one of the second and third heat discharging means 172, 173 may be set lower than the set temperature of the other open / close plate 17a. When configured in this manner, the opening and closing plate 17a opens in ascending order of the set temperature, and finally the opening and closing plate 17a of the first heat discharging means 171 opens. This further improves the exhaust heat efficiency.

  DESCRIPTION OF SYMBOLS 1 main body (rice cooker main body) 2 outer frame 3 upper frame 4 lower frame 5a heat shield plate 5b coil base 5c pot holder portion 6 inner case 7 sealed space 8 inner pot 8a pot portion , 9 body heater, 10 induction heating coil, 11 temperature sensor, 12 power supply substrate, 13 switching element, 14 protective cover, 15 radiator, 15a heat radiation fin, 16 inlet, 17 heat discharging means, 17a opening and closing plate, 17b heat discharging Hole 17c Sealing material 17d 庇 18 Cooling fan 19 Bottom plate 20 Exhaust port 21 Operation board attachment portion 22 Operation board 23 Operation panel 24 leg 25 lid 25a Outer lid 25b Inner lid Reference Signs List 26 hinge 27 locking button 28 packing 29 toner cartridge 31 suction port 32 first exhaust port 33 second exhaust port 171 first heat discharging hand , 172 second heat discharging means, 173 third heat discharge means.

Claims (9)

A rice cooker comprising: a rice cooker body having an inner case inside; a non-metallic inner pot which is removably housed in the inner case; and heating means for heating the inner pot,
A ring-shaped collar portion is provided on the outer peripheral portion of the inner pot,
A hook receiving portion is provided on the inner peripheral portion of the inner case, on which the hook portion of the inner hook is placed;
When the buttocks of the inner hook are placed on the hook receiving portion of the inner case, a sealed space is formed between the inner hook and the inner case,
The hot air is provided at a position below the kettle receiving portion of the inner case, and when the inner kettle is heated by the heating means, the hot air is heated according to the temperature of the hot air generated in the sealed space. A rice cooker characterized by comprising heat discharging means for discharging to the outside of the case.   The heat discharging means is provided at a heat discharging hole provided at a lower position of the kettle receiving portion, and on the outer side of the inner case so as to face the heat discharging hole, and the heat discharging hole is used as a temperature of the hot air. The rice cooker according to claim 1, further comprising: an opening and closing plate that opens and closes according to.   The rice cooker according to claim 2, wherein a plurality of the heat discharge holes are provided in the vertical direction.   The rice cooker according to claim 2 or 3, wherein the heat discharge holes and the opening and closing plate are provided at a plurality of positions below the kettle receiving portion.   The rice cooker according to any one of claims 2 to 4, wherein the opening and closing plate is formed of a shape memory alloy whose shape changes with temperature.   The rice cooker according to claim 4, wherein the opening and closing plates provided at the plurality of places are formed of a shape memory alloy whose shape changes at different temperatures.   The rice cooker according to any one of claims 2 to 6, wherein a sealing material is provided on a surface of the opening and closing plate facing the heat discharge hole.   The rice cooker according to any one of claims 2 to 7, wherein a bowl is provided above the heat discharge hole.   An intake port, an exhaust port, and a cooling fan for drawing outside air from the intake port at a position different from the position where the power supply substrate of the heating means is disposed in the bottom plate of the rice cooker body The rice cooker according to any one of claims 1 to 8, characterized in that

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