JP3132429B2 - Electric rice cooker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric rice cooker, and more particularly, to an electric rice cooker which can be heated from substantially the entire outer peripheral side of an inner pot.

[0002]

2. Description of the Related Art An electric rice cooker, which has been well known, has an upper opening between an outer case made of synthetic resin or sheet metal and an inner case made of sheet metal, for example, joined by an annular shoulder member made of synthetic resin. At the inner bottom of the container body, a rice cooker having a heating plate embedded with a heating element is arranged, and an inner pot placed on the hot plate is housed. The bottom portion of the inner pot is heated by the rice cooker, and the inner pot is heated from the side by the hot air in the space formed between the container body and the inner periphery of the inner pot.

[0003]

In the case of the above-mentioned conventional electric rice cooker, the bottom portion of the inner pot is directly heated by the rice-cooking heater at the time of cooking, and is formed between the container body and the inner pot side circumference. Heating from the side of the inner pot is likely to be insufficient, and heating from the entire outer peripheral surface of the inner pot like cooking rice with kamado And it is difficult to cook plump rice.

[0004] Therefore, a heating plate in a rice cooking heater is extended upward so as to cover the entire side circumference of the inner pot, and a heat transfer portion is integrally formed so that a heating state similar to Kamado cooking can be obtained. However, in such a case, it is structurally preferable to adopt a structure in which the heat transfer section and the shoulder member are joined.

However, when such a structure is adopted, the heat transfer portion is heated to a considerably high temperature, so that the shoulder member usually made of a synthetic resin material has a problem of thermal deterioration. To cope with this problem, the shoulder member may be formed of a synthetic resin material having excellent heat resistance, but the gloss and the like of the synthetic resin material having excellent heat resistance are higher than those of conventionally used polypropylene. Inferiority causes the following problems. That is, since the shoulder member has a portion exposed to the outside, it is necessary to maintain good appearance properties such as gloss.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has a heating plate in a rice cooking heater so that heating can be performed from the entire outer peripheral surface of an inner pot at the time of rice cooking, while preventing thermal degradation of a shoulder member. It is intended to be able to do so.

[0007]

According to the present invention, as a means for solving the above problems, there is provided a container body comprising an outer case forming an exterior surface and a shoulder member forming a shoulder of the outer case; A lid for the container body, and a rice cooking heater disposed on the inner bottom portion of the container body and having a heating element embedded in a heating plate, wherein the rice cooker is placed on the heating plate in the container body. In the electric rice cooker containing the inner pan, in the hot plate,
Hula formed integrally with the upper end of and the heat transfer portion formed integrally with the heat transfer unit that will be extended so that the top along the outside of the inner pot
The flange part and the shoulder member are fixed with screws with a spacer made of a thermally defective conductor interposed therebetween , and the flange is fixed to the shoulder member.
An annular rib surrounding the screw hole is integrally provided on the upper surface of the flange .

[0008] With the above-described structure, heating from the entire outer peripheral surface of the inner pot can be obtained at the time of cooking rice, so that it is possible to cook plump rice and to increase the heating power and to increase the power. Is also possible.
In addition, the heat conduction from the heat transfer portion to the shoulder member in the hot plate is reduced by the interposition of the spacer, so that thermal degradation of the shoulder member can be prevented. Moreover, the heat in the heat transfer section
Make sure that the flange and the spacer come in contact via the annular rib
The contact area is reduced, and the flange
The amount of heat conduction to the pacer can be kept low, and the shoulder
The heat deterioration of the material can be prevented more reliably and the heat transfer
The amount of heat radiation from the part to the inner pot can be increased .

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the accompanying drawings, a reference example of the present invention and some preferred embodiments will be described in detail below.

Reference Example FIG. 1 shows an electric rice cooker according to a reference example of the present invention.

The electric rice cooker comprises a cylindrical container body 1 having a bottom and configured to accommodate an inner pot 3 for cooking rice, and a lid 2 for opening and closing the upper opening of the container body 1 in an openable and closable manner. It is provided with.

The container body 1 is made of synthetic resin (for example,
The outer case 4 includes a cylindrical outer case 4 with a bottom and a synthetic resin (for example, polypropylene) annular shoulder member 5 coupled to an upper opening edge of the outer case 4.

A support boss 6 is formed integrally with the bottom 4a of the outer case 4, and a metal heat shield case 7 is supported on the support boss 6 by screwing.
A heater 8 for cooking rice is mounted in the heat shield case 7 with screws, and the inner pot 3 is stored in a state of being placed on the heater 8 for cooking rice. .

The rice cooking heater 8 is provided with the heat shielding case 7.
A heating element (for example, a sheathed heater) 10 is embedded in an outer peripheral portion of a disk-shaped heating plate 9 made of a good heat conductor (for example, aluminum or an aluminum alloy) attached to the heating plate 9. Is formed integrally with a cylindrical heat transfer portion 11 that extends along the outer peripheral surface of the inner pot 3 and is coupled to the shoulder member 5 to a position near the upper opening of the container body 1. . That is, the rice cooking heater 8 forms the inner peripheral surface of the container body 1.

A spacer 12 made of a poorly heat-resistant conductor (for example, a heat-resistant resin such as polycarbonate or polyphenylene sulfide or ceramic) is provided between the heat transfer portion 11 and the shoulder member 5. Have been. The spacer 12 is an annular body having a substantially L-shaped cross section. The horizontal portion 12 a is fixed to a flange portion 13 integrally formed on the upper end of the heat transfer portion 11 by a screw 14 while the vertical portion 12 a is fixed. The helicoid 16 is attached to the annular projection 15 integrally protruding from the lower surface of the shoulder member 5.
Are connected by That is, the shoulder member 5 and the heat transfer section 11 are connected via the spacer 12.

A seal packing 17 for maintaining watertightness between these members is provided between the spacer 12 and the heat transfer portion 11 and the shoulder member 5. The seal packing 17 is a first seal portion 1 for sealing between the inner peripheral side of the spacer 12 and the inner peripheral side of the heat transfer section 11.
7a, a second seal portion 17b for sealing between an inner peripheral side of the spacer 12 and an inner peripheral side of the shoulder member 5, and a connection between the first seal portion 17a and the second seal portion 17b. It is constituted by an integrally molded product having a U-shaped cross section and comprising a connecting portion 17c covering the inner peripheral side of the spacer 12. The watertightness between the spacer 12 and the heat transfer portion 11 and the shoulder member 5 can be reliably maintained, and the connecting portion 17c prevents the inner pot 3 from shifting and rotating the inner pot 3 when picking rice. Prevention can be achieved.

The heat shield case 7 includes the rice cooker 8
Is formed in a substantially cylindrical shape with a bottom so as to wrap the entire outer peripheral side thereof, and an inward flange portion 18 integrally formed at the upper end thereof is inserted between the spacer 12 and the flange portion 13 of the heat transfer portion 11. The screws 14 are fixed together. That is, the heat shield case 8 covers the entire outer peripheral side of the rice cooking heater 8.

A step 19 is formed above the side peripheral portion 7a of the heat shield case 7, and the step 19 and the heat transfer section 1 are formed.
A heat insulating material 20 is provided in a space formed between the first flange portion 13 and the first flange portion 13. With this configuration, the heat insulating material 20 can be small, and the heat radiation from the heat transfer unit 11 to the outside is shut off, so that the amount of radiant heat to the inner pan 3 increases, and the side circumference of the inner pan 3 is increased. Heating from the part can be performed more efficiently. Further, on the outer peripheral surface of the heat transfer section 11, a heater 21 for heat retention is attached at a position corresponding to the space.

The step portion 19 has the heat transfer portion 11
Is disposed at a position close to the shoulder member 5 on the outer peripheral side of
A bracket 23 for attaching a thermal fuse 22 that is blown off during abnormal heating and stops energizing the rice cooking heater 8 is attached by a screw. With this configuration, at the time of abnormal heating, the temperature of the portion close to the shoulder member 5 is detected and the thermal fuse 22 is blown, so that thermal deformation of the shoulder member 5 due to abnormal heating can be prevented.

The lower part of the outer peripheral surface of the heat transfer part 11 (for example, a part below a position corresponding to the step part 19)
A plurality (for example, 3 to 4) of fins 24 are formed integrally. The fins 24, 24,... Act as heat storage fins when the rice cooker 8 is energized (in other words, during rice cooking) to increase the amount of heat radiation from the heat transfer unit 11 to the inner pot 3 side. When the power supply to the rice cooker 8 is stopped (in other words, at the time of keeping the temperature), it acts as a cooling fin to accelerate the temperature drop of the inner lid 3 and to prevent the rice from sticking. It functions to prevent yellowing and the like.

At the lower end of the outer peripheral surface of the heat transfer section 11, an annular rib 25 is integrally formed to protrude from the outer periphery of the bottom 7b of the heat shield case 7 and abuts on the inner surface of an upright portion 7c. ing. With this configuration, a heat storage space 26 surrounded by the annular rib 25 is formed on the lower surface side of the rice cooking heater 8, and high-temperature air stays in the heat storage air 26 during rice cooking and rises upward (that is, the shoulder). (To the member 5 side). Therefore, the temperature rise of the shoulder member 5 is suppressed, and the temperature of the bottom portion of the inner pot 3 in which the rice cooker 8 and the inner pot 3 are in contact with each other and the heat conductivity is increased, thereby improving the thermal efficiency. Yes (in other words, power consumption can be reduced).

Further, a plurality (for example, three to four) of vertically extending ribs 27, 2 are provided on the inner surface of the heat transfer portion 11.
Are formed integrally at equal intervals in the circumferential direction. The ribs 27 prevent the inner pot 3 housed in the container body 1 from rattling. Reference numeral 28 denotes a center sensor.

By the way, if foreign matter (for example, rice grains) is present between the inner pot 3 and the rice cooker 8, heat conduction from the rice cooker 8 to the inner pot 3 deteriorates, and the center sensor 2
Although the temperature detected by the heater 8 does not rise, the temperature of the rice cooker 8 rises, resulting in foreign rice cooking. Therefore, in the present embodiment, an annular groove 29 having a depth large enough to accommodate foreign matter is formed on the inner surface of the continuous portion between the heating plate 9 and the heat transfer portion 11. In this way, the foreign matter that has entered the container body 1 is stored in the annular groove 29, and the contact between the inner pot 3 and the hot platen 9 is not impaired. The position where the annular groove 29 is formed is desirably a position where foreign matter that has entered the container body 1 is easy to enter.
In the present embodiment, the lower end portion of the continuous portion between the heat transfer portion 11 and the hot platen 9 is set because the center portion of the heat transfer portion 11 is normally higher.

The lid 2 is formed by joining an upper plate 30 and a lower plate 31 made of a synthetic resin (for example, polypropylene) at respective outer peripheral edges. And the projection 32 are formed integrally. The projection 32
An inner lid 33 for closing the opening of the inner pot 3 when the lid 2 is closed is provided with a cap-shaped sealing member 34.
It is detachably attached via. In addition, a seal packing 35 for maintaining airtightness between the outer edge of the lower plate 31 and the upper edge of the inner lid 3 is provided on the lower plate 31.
Is mounted in a state of being clamped by a fixture 36 fixed by screws 37 with respect to.

By the way, in the case of the electric rice cooker according to the present embodiment, since the lower plate 31 is not provided on the lower surface side of the lid 2, the lower plate 31 melts down at the time of the abnormal test, so that the electric rice cooker cannot be used. There is a risk of disappearing. In order to prevent such a situation from occurring, in the present embodiment, a lid-side temperature fuse is provided on the upper surface of the lower plate 31 so that the lower plate 31 is melted before the lower plate 31 is melted and the power supply to the rice cooking heater 8 is stopped. 38
Are mounted in a state of being clamped by a mounting member 39 fastened together by the screw 37. Reference numeral 40 denotes a handle for carrying the electric rice cooker.

The rice cooking heater 8, the heat retaining heater 21,
The thermal fuse 22 and the lid-side thermal fuse 38 are the same as those shown in FIG.
Are connected as shown in FIG. Reference numeral 41 is a printed circuit board, 42 is a microcomputer, 43 is a relay contact, and 44 is a triac.

Therefore, at the time of abnormal overheating, the temperature fuse 2
2 and the lid-side temperature fuse 38 are blown, the energization of the rice cooker 8 and the heater 21 is stopped, and thermal deformation or melting of the shoulder member 5 and the lower plate 31 of the lid 2 is avoided. it can.

In the electric rice cooker configured as described above, the following operational effects can be obtained.

That is, at the time of cooking rice, heating from the entire surface can be obtained by the rice cooking heater 8 covering the entire outer peripheral surface of the inner pot 3, thereby making it possible to cook plump rice and increase the heating power. High power can be realized. In addition, heat conduction from the heat transfer portion 11 to the shoulder member 5 in the rice cooking heater 8 is reduced by the interposition of the spacer 12, and the shoulder member 5 is made of a synthetic resin that meets conditions such as gloss. However, thermal degradation of the shoulder member 5 can be prevented.

First Embodiment FIGS. 3 and 4 show a main part of a container body in an electric rice cooker according to a first embodiment of the present invention.

In this case, an annular rib 46 surrounding the screw hole 45 and an annular rib 47 located on the inner peripheral edge of the upper end of the heat transfer section 11 are provided on the upper surface of the flange section 13 of the heat transfer section 11 of the rice cooker 8. It protrudes integrally. Reference numeral 48 denotes a screw hole formed in the horizontal portion 12a of the spacer 12. By doing so, the contact area between the flange portion 13 and the spacer 12 is significantly reduced, and the amount of heat conduction from the flange portion 13 to the spacer 12 can be reduced. Therefore, the heat transfer section 1
While the amount of heat radiation from 1 to the inner pan 3 side increases, the amount of heat conduction from the heat transfer portion 11 to the shoulder member 5 side can be reduced, so that efficient heating and suppression of heat influence on the shoulder member 5 can be achieved. Can be compatible. The other configuration and operation and effect are the same as those in the reference example, and the description is omitted.

Second Embodiment FIGS. 5 and 6 show a main part of a container body in an electric rice cooker according to a second embodiment of the present invention.

In this case, the annular rib 47 in the first embodiment is omitted, and the horizontal portion 12a of the spacer 12 is omitted.
A downwardly extending annular projection 49 hanging down to the inner peripheral side of the heat transfer section 11 is integrally provided on the inner peripheral edge of the heat transfer section 11. This way,
The flange 13 and the spacer 12 come into contact only with the annular rib 46, and the contact area is further reduced. The other configuration and operation and effect are the same as those in the reference example and the first embodiment, and thus the description is omitted.

[0034]

According to the present invention, a container body comprising an outer case forming an exterior surface and a shoulder member forming a shoulder of the outer case, a lid of the container body, and an inner part of the container body are provided. A rice cooker provided at the bottom and having a heating element embedded in a hot plate, and an electric rice cooker containing an inner pot placed on the hot plate in the container body. , the heating plate, which is formed integrally with the upper end of the inner and the heat transfer portion formed integrally with the heat transfer unit that will be extended so that the top along the outside of the pot
The flange portion and the shoulder member are fixed with screws with a spacer made of a heat-defective conductor interposed therebetween, and
An annular rib surrounding the screw hole is integrated with the upper surface of the flange
By projecting , heat conduction from the heat transfer section on the hot plate to the shoulder member
Alleviated by the interposition of spacers, and
Flange and spacer contact each other via an annular rib
Due to the reduced contact area
Heat conduction to the heat sink.
Thermal degradation of components can be prevented more reliably, and
The effect of increasing the amount of heat radiation from the hot part to the inner pot
is there. In addition, since heating is performed from the entire outer peripheral surface of the inner pot at the time of cooking rice, plump rice can be cooked, and high power can be obtained by increasing the heating power.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an electric rice cooker according to a reference example of the present invention.

FIG. 2 is a connection diagram of electric elements in an electric rice cooker according to a reference example of the present invention.

FIG. 3 is a cross-sectional view showing a main part of the container body in the electric rice cooker according to the first embodiment of the present invention.

FIG. 4 is an exploded perspective view showing a main part of the container body in the electric rice cooker according to the first embodiment of the present invention.

FIG. 5 is a sectional view showing a main part of a container main body in the electric rice cooker according to the second embodiment of the present invention.

FIG. 6 is an exploded perspective view showing a main part of a container main body in the electric rice cooker according to the second embodiment of the present invention.

[Explanation of symbols]

1 is a container body, 2 is a lid, 3 is an inner pot, 4 is an outer case, 5
Is a shoulder member, 8 is a rice cooking heater, 9 is a hot plate, 10 is a heating element, 11 is a heat transfer section, 12 is a spacer, 12a is a horizontal section,
12b is a vertical portion, 13 is a flange portion, 14 is a screw, 17
Is a seal packing, 17a is a first seal portion, 17b is a second seal portion, 17c is a connecting portion, 20 is a heat insulating material, 22 is a thermal fuse, 45 is a screw hole, and 46 is an annular rib.

Claims (1)

(57) [Claims] 1. A container body comprising an outer case forming an exterior surface and a shoulder member forming a shoulder of the outer case, a lid of the container body, and an inner bottom of the container body, An electric rice cooker comprising a rice cooker having a heating plate embedded with a heating element, and an inner pot placed on the hot plate in the container body. to form a heat transfer unit that will be extended so that the top along the outside of the inner pot together 且
One flange portion formed integrally with the upper end of the heat transfer section and with said shoulder member, interposed a spacer of a thermally poor conductor tongue
While fixing it with screws, and
An electric rice cooker characterized in that an annular rib surrounding a screw hole is integrally provided on a surface thereof.