JP5817228B2 - Electric rice cooker - Google Patents

Description

  This invention relates to the structure of the electric rice cooker provided with the inner pot which the uniform heating of the whole inner pot is possible and can cook the rice without cooking unevenness.

  The electric rice cooker generally consists of an inner pot that contains rice and water and a rice cooker body equipped with heating means for heating the inner pot, and a lid that closes the upper opening of the rice cooker body, When cooking rice, a predetermined amount of rice and water is put in the inner pot, stored in the rice cooker body, and the bottom portion of the inner pot is heated by heating means to cook rice.

  However, when heating around the bottom of the inner pot in this way, on the inner pot bottom bottom surface (flat surface) and the inner pot bottom outer peripheral surface (corner rounded surface) near the heating source, the rice becomes too soft, There is a problem that uneven cooking occurs that the amount of heating is insufficient and the rice becomes hard on the side surface of the inner pot that moves away from the heating source.

  Therefore, in order to eliminate such uneven cooking (heating unevenness), for example, an inner pan provided with a heat generating layer member made of a magnetic metal material on the outer surface and heating that heats the inner pan by causing the heat generating layer member to generate heat by electromagnetic induction. In the electric rice cooker comprising a coil, on the outer surface of the heat generating layer member provided on the outer surface of the inner pot, a plurality of concave grooves extending spirally from the bottom surface of the inner pot toward the lower end of the side surface are formed and heated. There has been proposed an electric rice cooker that does not increase the amount and promotes the convection of the entire hot water in the inner pot to suppress the uneven cooking (heating unevenness) as described above (for example, , See Patent Document 1).

  Moreover, in the same electric rice cooker, on the inner surface of the inner pot, by forming a plurality of concave grooves extending spirally from the bottom surface of the inner pot toward the lower end of the side surface, without increasing the heating amount, and with a simple structure, There has been proposed an electric rice cooker that promotes the convection of the entire hot water in the inner pot to suppress the uneven cooking (heating unevenness) as described above (see, for example, Patent Document 2).

Japanese Patent Laid-Open No. 11-267011 Japanese Patent Laid-Open No. 11-267013

  However, in the case of the electric rice cooker configured as described above, although it can be estimated that it is possible to contribute to the elimination of cooking unevenness (heating unevenness) to some extent by promoting convection by the plurality of concave grooves on the outer surface or inner surface of the inner pot bottom. Since the absolute heating power of the inner pot side wall cannot be improved, the improvement effect is naturally limited. In addition, forming the concave groove on the outer surface of the heat generating layer member is accompanied by technical difficulties, is difficult to process, and may be disadvantageous in terms of cost. In particular, when an earthen pot having poor heat conductivity and workability is adopted as the inner pot, those problems are further increased.

  Moreover, what formed the ditch | groove part in the inner surface of the inner pot has not only inconvenience for washing | cleaning and rice washing, but also has a fatal fault that rice remains easily.

  This invention is made in order to solve such a subject, By improving the heating power of the side wall part itself of an inner pot, the cooking nonuniformity (heating nonuniformity) between bottom wall parts is effectively carried out. An object of the present invention is to provide an electric rice cooker that can suppress and make the heating power of the entire inner pot uniform to cook delicious rice.

  In order to solve the above problems, the present invention includes the following effective problem solving means.

(1) Invention of Claim 1 In this invention, as a means for solving the said subject, by making the bottom part side heat generating part and the bottom part side heat generating part generate | occur | produce heat , and the bottom part side heat generating part generate | occur | produce heat. and a heating means for heating the inner bowl, an electric rice cooker was set to raise cooking rice by heating the inner bowl by heating means, the outer surface of the side wall-side non-heating portion of the inner bowl In addition, an uneven portion extending from the lower end side toward the upper end portion is formed.

In such a configuration, an electric pot that has an inner pot having a bottom side heat generating part and a side wall part non-heat generating part, heats the inner pot by heating the bottom side heat generating part, and cooks rice. in rice cooker, the outer surface of the side wall-side non-heating portion of the inner bowl, the simple and low-cost configuration of forming concave and convex portions extending toward the upper portion from the lower end of that, the pot among without essentially heating unit It becomes possible to effectively increase the heat receiving area of the portion from the lower end side to the upper end portion of the outer surface of the side wall portion , increasing the amount of heat received and increasing the heating power.

As a result, cooking unevenness (heating unevenness) between the bottom wall portion, which is a heat generating portion, can be reduced, and delicious rice can be cooked.

(2) of the invention in the invention of claim 2, heating as a means for solving the above problems, an inner pot, the inner pot and a heating means for heating by electromagnetic induction, said inner bowl by heating means met electric cooker you raise cooked rice by the outer surface of the inner pot, provided with a non-heat generating portion is not heated by the heating portion and the electromagnetic induction generates heat by electromagnetic induction, the non-heat generating portion forming a concave protrusion.

In such a configuration, the heat receiving area of the non-heat generating portion on the outer surface of the inner pot can be effectively increased by a simple and low-cost means of forming an uneven portion on the non-heat generating portion on the outer surface of the inner pot. Increases and heating power increases.

As a result, cooking unevenness (heating unevenness) between the bottom wall portion, which is a heat generating portion, can be reduced, and delicious rice can be cooked.

(3) Invention of Claim 3 In this invention, as a means for solving the said subject, it is equipped with the inner pot and the heating means which heats this inner pot, By heating the said inner pot with this heating means, , an electric rice cooker was set to raise cooked rice, the side wall outer surface of the inner pot, to form a concave-convex portion extending toward the upper end from the lower end, collecting the portion facing to the irregular portion An air heater is provided.

In such a case, the electric heater, in the side wall outer surface of the inner pot, will be opposed to the concave-convex portion extending toward the upper end from the lower end, heating power by the electric heater, those receiving heat area The large uneven part is efficiently irradiated, and a large amount of heat is effectively absorbed in the same heat receiving area, so the heating amount and heating efficiency inside the inner pot are greatly improved. To do.

  As a result of the above, according to the present invention, the heating power and heating efficiency of the non-heat-generating part such as the side surface can be improved so as to be in a substantially uniform heating state from the bottom part of the inner pot to the entire side part. Thus, the conventional heating unevenness can be eliminated substantially effectively.

It is a longitudinal cross-sectional view of the whole rice cooker main body of the electric rice cooker concerning Embodiment 1 of this invention. It is a front view which shows the structure of the operation panel part in the electric rice cooker concerning Embodiment 1 of the invention of this application. It is an expanded half-sectional view (corresponding to BB section of Drawing 5) which shows the composition of the inner pot part in the electric rice cooker concerning Embodiment 1 of the invention of this application. It is an enlarged half-sectional view which shows the structure of the inner pot and inner case part in the electric rice cooker concerning Embodiment 1 of the same this invention. It is an enlarged side view which shows the structure of the inner pot in the electric rice cooker concerning Embodiment 1 of the same this invention. It is AA sectional drawing of the same FIG. It is an enlarged side view which shows the structure of the inner pot in the electric rice cooker concerning Embodiment 2 of this invention. It is CC sectional drawing of the same FIG.

<Embodiment 1>
Hereinafter, the configuration of the electric rice cooker according to Embodiment 1 of the present invention will be described with reference to FIGS.

  First, as shown in FIG. 1, the electric rice cooker 1 of this embodiment is a highly heat-storing pan (for example, a ceramic earthen pot) made of a nonmetallic material, for example, as an inner pot (rice cooker or heat insulation container) 3. Is adopted as an example, and the eddy currents induced inside are respectively present on the bottom center surface (flat surface portion) of the bottom wall portion 3a and the outer surface of each corner surface portion (Ru surface portion) 3b on the outer periphery of the bottom wall portion 3a. The first and second induction heating elements G1 and G2 made of metal, such as silver paste, capable of self-heating are provided with a predetermined width.

  In other words, the bottom center surface (flat surface portion) of the bottom wall portion 3a and the outer surface of the corner surface portion (R surface portion) 3b on the outer periphery of the bottom wall portion 3a are heat generating portions that generate heat by electromagnetic induction heating, and the corner surface portion (R surface portion). ) The upper surface of 3b, in other words, the outer surface of the vertical wall portion from the lower end side (straight portion lower end side) of the side wall portion 3c to the upper end opening edge portion (flange portion) 3d is a non-heat generating portion that does not generate heat due to electromagnetic induction heating. Has been.

  In the present embodiment, as described above, the first and second induction heating elements G1 and G2 made of metal such as silver paste are provided on the outer surface of the non-metallic inner pot to form the heating part. Of course, as the inner pot 3, an inner pot made of metal and made of a non-magnetic material (for example, aluminum) can be adopted. In that case, a member that generates an eddy current by electromagnetic induction can be formed into the same aluminum material by insert molding or sprayed to form a similar heat generating portion.

  And as shown in FIG. 3 thru | or FIG. 6, the unevenness | corrugation extended toward the upper end side opening edge part 3d from the lower end part (corner surface part 3b upper end), for example in the non-heating part outer surface of the side wall part 3c of the said inner pot 3 is shown. Portions X, X,... Are formed. In the case of the present embodiment, the concavo-convex portions X, X,... Are formed on the outer surface of the non-heat generating portion of the side wall portion 3c of the inner pot 3 from the lower end side. Part) A plurality of triangular strips formed at a predetermined interval so as to extend spirally toward 3d, and a cross-sectional arc shape formed between the convex strips x, x ... Are formed by the concave line portions y, y.

  These ridges x, x... And ridges y, y... Are highly heat-storing pots made of a non-metallic material as inner pots 3 (for example, ceramic pots), as in the present embodiment. Is used, the spiral concave ridges y, y,... Extending from the lower end side toward the upper end portion with respect to the outer surface of the side wall portion 3c on the outer surface of the clay-like earthen pot before baking (fire) are introduced. Are formed by forming the ridges x, x... At a predetermined interval, and the concavo-convex parts X, X.. As compared with an inner pan or the like formed by processing, formation of the uneven portions X, X.

  And in the case of this Embodiment, since the unevenness | corrugation processing is not given to the inner surface side of the said inner pot 3, it may impair the careability of rice etc. like the conventional patent document 2. Absent.

  In addition, in the case of this embodiment, a portion (cylindrical wall portion 4c of the inner case 4 to be described later) facing the uneven portions X, X. An electric heater H1 for heat insulation is provided over the whole from the lower end side to the upper end side via the cylindrical wall portion 4c at the top of the case 4.

  In this case, the heat generated by the electric heater H1 is applied to the uneven portions X, X,... Having a large surface area (heat receiving area) through the metal cylindrical wall portion 4c having good thermal conductivity. It becomes possible to heat the cooked rice in the inner pot side wall portion 3c with a sufficient heating power by efficiently receiving and storing a large amount of heat with the uneven portions X, X,. .

  As a result, the heating efficiency from the inner pot side wall 3c side is greatly improved, and the cooking unevenness is greatly improved as compared with the conventional case of convection promotion only from the lower side (bottom wall 3a side). It has become.

  And the electric rice cooker 1 of this embodiment is the said synthetic resin dish-shaped lower protective frame 4a formed so that the inner pot 3 of the above structures can be arbitrarily accommodated and set, and the upper side. An inner case 4 formed of a cylindrical wall portion 4c, a bottomed cylindrical outer case 5 which is an outer casing for holding the inner case 4, and a bottom case 13 integrally fitted to a lower portion of the outer case 5; The lid 2 is provided at the top of a rice cooker body formed by integrating the outer case 5 and the inner case 4 with a shoulder member 10A.

  On the other hand, a coil cover (coil base) 6 having a ferrite core storage portion is provided below the dish-shaped lower protective frame 4a that is the bottom wall portion of the inner case 4, and a lower portion thereof is provided with Between the ferrite cores, and between them, a flat surface portion on the center side of the lower protective frame 4a which is a receiving wall portion of the inner pot 3 and a corner surface portion on the outer peripheral side of the bottom wall portion 3a of the inner pot 3 ( First and second sets of work coils C1, in which litz wires are concentrically wound corresponding to the positions of the first and second sets of induction heating elements G1 and G2 of the round surface portion 3b. C2 is provided, and when energizing them, an eddy current is induced in the first and second induction heating elements G1 and G2 in the inner pot 3 to heat the inner pot 3 efficiently. ing. That is, the first and second work coils C1 and C2 and the first and second induction heating elements G1 and G2 constitute a heating means for heating the inner pot 3.

  The rear side of the outer case 5 made of synthetic resin is formed in, for example, an H shape in a plan view, and is provided with a partition wall 24 that is located in the rear part between the left and right side walls parallel to the front-rear direction and extends left and right. ing. The left and right ends of the partition wall 24 are fitted (engaged) with the front end of the side wall portion of the outer case cover 5b that is U-shaped in plan view from the rear side.

  Between the partition wall 24 of the outer case 5 and the outer case cover 5b, an electrical component storage space having a high sealing property is formed so as to be partitioned from the inner case 4 side. And in this electrical equipment storage space, the above-mentioned first and second work coils C1, C2, IGBTs for driving and controlling the electric heater H1, etc., a heater drive circuit, a rectifier circuit comprising a diode bridge for power supply voltage rectification, A first substrate (control substrate) B1 provided with a smoothing circuit and the like, and a substrate cover (control substrate cover) 7 holding the first substrate B1 are provided in an upright direction.

  On the first substrate B1, necessary parts such as a first microcomputer control unit for controlling the power of the IGBT, the first and second work coils C1 and C2, the electric heater H1, and the lid heater H2 are provided. In addition, a second substrate (microcomputer substrate) B2 on the lid 2 side, which will be described later, is connected via a flexible flat cable that is a connection wiring.

  For example, the substrate cover 7 is detachably attached to the partition wall 24 of the outer case 5, and a lower side of the substrate cover 7 is attached to, for example, the lower surface side of the lower protective frame 4 a. The first blower fan 11A for flowing cooling air to the heat dissipating fins of the heat sink 25 of the first and second work coils C1, C2 and the first substrate B1, and the left and right sides of the inner pan 3 1, second and third blower fans 11B and 11C for directly blowing cooling air toward the second induction heating elements G1 and G2 are respectively integrally attached (the second blower fan 11B is The illustration is omitted because it is in front of the cut surface in FIG. 1 and is not visible).

  11 A of said 1st ventilation fans are equipped with the axial flow fan 56c in the ventilation path 56b in the short cylindrical fan casing 56a opened to the up-down direction, and the blowing air distribution duct 56d to the bottom part side of the lower protective frame 4a It is configured with.

  On the other hand, the second and third blower fans 11B and 11C have a multi-blade rotor 11d driven by a fan motor 11e in a spiral scroll casing 11b and suck in from an air suction port 11g provided on the side surface side. It consists of a sirocco fan (registered trademark) that blows air from the air blowing end downstream of the scroll passage 11a, and they are alternately operated for a predetermined time, and the blown air from the air blowing end is Air is blown through a flexible rubber communication pipe (not shown) to an air passage 15 formed on the entire circumference of the upper end 4b portion of the lower protective frame 4a.

  The air duct 15 has a concave groove-shaped annular duct formed in the upper end 4b portion of the lower protective frame 4a, and a reverse concave groove-shaped cap portion fitted to the annular duct from above. 9 is formed. In the air passage 15, six air blowing openings F, F,... Are equally spaced in the circumferential direction toward the second induction heating element G2 in the corner portion 3b of the inner pot 3 (and slightly downward). Is formed). In addition, a V-shaped airflow guide in plan view is provided in each of the airflow openings F, F., and when one airflow fan is driven by the presence of the airflow guide, Cooling air flowing through the air passage 15 is smoothly blown from the air blowing openings F, F,... At different distances toward the first and second induction heating elements G1, G2 of the inner pot 3. It is like that.

  In order to cook rice deliciously, in the cooking process that requires a high temperature and high heating power to pass enough heat to cooked rice, such as the heating process and the cooking process after the heating process, It is preferable to provide as high a heating output as possible.

  However, in that case, if there is a portion where the inner pot 3 is locally hot, a heat-resistant measure is required at that portion, and the heating output cannot be increased effectively.

  However, as described above, the cooling air is directly blown to the first and second induction heating elements G1 and G2 of the inner pot 3 by the second and third blowing fans 11B and 11C. The induction heating elements G1 and G2 which are locally high in the first and second temperatures are cooled to effectively recover the heat, and conversely, the relatively low temperature side wall 3c (in other words, the non-heating part) ) If it is moved to the side and allowed to act, the heating temperature of the entire inner pot 3 can be made as uniform as possible, the heating efficiency can be improved, and spillage and scorching can be prevented. It becomes possible to greatly increase the amount of heating to the side wall portion 3c of the inner pot 3 that has been present, and it becomes possible to cook even more delicious rice.

  Moreover, in the case of the present embodiment, in that case, as described above, the concavo-convex portions X, X,... Are formed on the entire side wall portion 3c portion of the inner pot 3 which is a non-heat generating portion. High-temperature air that rises while swirling the outer peripheral surface of the side wall portion 3c of the inner pot 3 along the spiral groove portions y, y... And the protrusion portions x, x. The rising speed of the high-temperature air that has recovered the heat of the induction heating elements G1 and G2) is reduced, so that the heat recovered in the rising air is efficiently received by the side wall 3c of the inner pot 3 over time. (Heat transfer).

  Moreover, in this case, the high-temperature air that is transferred from the bottom wall 3a side of the inner pot 3 to the side wall 3c side while turning in the circumferential direction through the recesses y, y. It flows to the outer peripheral surface (lower surface) of the upper end side opening edge portion (flange portion) 3d of the inner pot 3, and the entire side wall portion 3c is efficiently heated from the lower end to the upper end.

  Therefore, the temperature of the side wall part 3c part of the inner pot 3 rises more effectively over the whole, and the heating amount and heating efficiency from the side wall part 3c part into the inner pot 3 rise more effectively. To do.

  For this reason, even in the case of full rice, it is possible to realize a better cooked state without causing dew or white blur.

  Further, the lower protective frame 4a which is a dish-shaped bottom wall portion in the inner case 4 is formed with a fitting port for a temperature sensor 18 for detecting the temperature of the bottom wall portion 3a of the inner pot 3 at the center of the bottom surface portion. In addition, a donut-shaped heat shield 8 is provided on the upper surface on the outer peripheral side of the temperature sensor fitting port. Further, a flange-shaped stepped portion projecting in the radial direction of a predetermined width is provided inside the outer peripheral portion of the annular duct 9 on the upper end portion 4b of the inner case 4, and an upper side of the inner case 4 is provided at the stepped portion. The lower end side of the cylindrical wall 4c is engaged and placed.

  On the other hand, the upper end of the upper cylindrical wall 4c in the inner case 4 is connected and fixed to the shoulder member 10A side portion of the upper end of the outer case 5 via an inner frame member 10B.

  Further, on the outer periphery of the upper cylindrical wall portion 4c in the inner case 4, an electric heater H1 that functions as a heating means for the inner pot side wall portion 3c at the time of rice cooking and heat insulation as described above is provided in the cylinder of the inner case 4. It is provided via the wall 4c, and the whole circumference of the side wall 3c of the inner pot 3 is effectively and uniformly heated at the time of cooking rice and at the time of heat insulation.

  In FIG. 1, reference numeral 11 denotes an air inlet for the first blower fan 11 </ b> A provided on the rear side of the bottom case 13, and 19 denotes a cord reel.

  Further, the cover 2 constitutes the uppermost surface thereof, and has an outer cover made of a synthetic resin provided with a steam pipe (pressure adjusting unit) 14 having a return function at the center of the steam pipe fitting hole 2f. 2a, an inner cover 2b made of the same synthetic resin provided integrally with the outer peripheral portion of the outer cover 2a, an inner frame member 2c provided in the outer peripheral portion of the inner cover 2b, and the inner frame member 2c, a metal heat dissipating plate 2d provided inside, a lid heater H2 provided on the upper surface of the heat dissipating plate 2d, and a metal inner cover 2e provided below the heat dissipating plate 2d. Configured.

  Further, packings P1 and P2 are respectively provided below the outer peripheral edge of the heat radiating plate 2d and below the outer peripheral edge of the inner lid 2e, and the inner lid 2e is connected to the inner pot via the packing P2. 3 is widely brought into contact with the upper surface portion inclined to the inner side of the upper end side opening edge portion (flange portion) 3d. Further, the steam pipe (pressure adjusting unit) 14 is formed with a steam discharge passage 25 that communicates with the zigzag structure from the steam inlet port of the heat radiating plate 2d toward the steam outlet port 14a of the outer cover 2a. ing. Reference numeral 14c is a pressure regulating valve (spherical valve) in the pressure regulating pipe 14b of the steam discharge passage 25, 14d is a cylindrical valve seat part having a valve port part on the lower side, and 14e is fitted to the lower end of the valve seat part. Combined pressure cap.

  The lid 2 is attached to a shoulder member 10A on the upper rear wall of the outer case 5 via a hinge shaft 28 having a hinge spring 29 so as to be rotatable in the vertical direction, and its open end side (front end side) ) On the inner peripheral surface, there is an engaging portion 2g that engages with the lid 2 and engages the lock claw 17b of the lock piece 17a on the rice cooker main body side that engages the opening of the lid 2 upward. Is provided.

  Then, by the ON operation of the lock mechanism unlock operation portion 17 provided at the upper position on the front wall 5a side of the outer case 5, the lock claw 17b of the lock piece 17a is engaged with the lid side engagement portion 2g. When released, the lid body 2 is automatically opened upward by the biasing force of the hinge spring 29.

  Moreover, in FIG. 1, the code | symbol 16 is a cover sensor (steam sensor) which detects the temperature in the said inner pot 3, and a boiling state.

  The lid sensor 16 is fitted with a steam pipe 16c having a steam passage 16e in the opening of the inner lid 2e, and a mounting holder 16a on the heat radiating plate 2d side in the steam passage 16e in the steam pipe 16c. And a tip of a temperature sensor 16b attached via 16d is inserted. In this case, as shown in the figure, the temperature sensor 16b is made of a shaft-like body that extends long from the top to the bottom, and the tip side sensor portion (temperature detection portion) is the opening edge of the inner pot 3. (Flange part) It is provided in the inner side (in the form of entering) 3d.

  On the other hand, in the center of the front part of the outer cover 2a of the lid 2, a concave groove 20f for fitting the operation panel part constituting the operation part and display part of the rice cooker is formed, and in the concave groove part 20f The operation panel portion 20 is fitted and covered so as to form an outer peripheral surface continuous with the outer peripheral surface of the outer cover 2a.

  The operation panel 20 is made of, for example, a thin box structure (made of synthetic resin), and is detachably fitted into the recessed groove 20f. And for example, as shown in FIG. 2, while having the transparent window corresponding to the liquid crystal display part 21 in the upper center part of the upper side member, the rice cooking switch 22a and the rice cooking reservation switch 22b for timer rice cooking in the circumference | surroundings , Cancel switch 22c, voice guide switch 22h, rice cooking menu switch 22f for specifying a rice cooking menu (for example, white rice, quick cooking, rice cake, rice porridge, brown rice or other course menu), clock and timer time setting switch 22d, clock and timer The operation keys for the time setting switch 22e, the heat retention switch 22i, the rice selection switch 22g, and the fire adjustment setting switch 22j are provided. The rice cooking switch 22a, the rice cooking reservation switch 22b, and the heat retention switch 22i are provided with operation display LEDs 23a to 23d for displaying respective operation states.

  By comprising as mentioned above, in the electric rice cooker concerning this Embodiment, the uneven | corrugated | grooved part extended toward the upper end side opening edge part 3d from the side wall part 3c which is an outer surface of the inner pot 3, and is a non-heating part. By the simple and low-cost means of forming X, X,..., The amount of heat received from the side wall portion 3c to the upper end side opening edge portion 3d on the outer surface of the inner pot 3 and the amount of heat into the inner pot 3 are reduced. Since it can be increased, regardless of the amount of cooked rice, it is possible to effectively eliminate cooking unevenness (heating unevenness) and cook more delicious rice.

In particular, in the present embodiment, an electric heater H1 for heat insulation is provided at a portion facing the uneven portions X, X,... Of the side wall 3c of the inner pot 3, and the heating force by the electric heater H1 is the above. The uneven portions X, X,... Having a large heat receiving area (surface area) are irradiated, and the inner pot 3 side wall 3c, which is a non-heat generating portion, can be efficiently heated, effectively increasing the amount of heat received. by, it is Rukoto to up the heating power of the inner pot 3.

<Embodiment 2>
Next, the configuration of the electric rice cooker according to Embodiment 2 of the present invention will be described with reference to FIGS. 7 and 8 of the accompanying drawings.

  As other embodiment of the uneven | corrugated | grooved part X of this invention mentioned above, as shown, for example in FIG.7 and FIG.8, in the outer surface of the side wall part 3c of the earthenware pot similarly adopted as the above It is also possible to form a plurality of concave ridges y, y,... Extending spirally from the lower end side toward the upper end side opening edge 3d at predetermined intervals without being adjacent to each other.

  In this case, not the triangular section as described above but the trapezoidal sections x, x,... Having a trapezoidal section are formed between the concave sections y, y,.

  Even in such a configuration, as in the case described above, spirally from the lower end side of the outer surface of the side wall 3c of the clay state clay pot before baking (fire) toward the upper end opening edge 3d. The extending concave portions y, y... Are formed at predetermined intervals, and the convex portions x, x,. Are formed to form the uneven portions X, X,.

  Even in such a configuration, the heating efficiency from the side wall 3c side of the inner pot 3 is greatly improved by the same action as described above, and the convection only from the bottom wall 3a side of the inner pot 3 as in the prior art. Compared to the case of promotion, cooking unevenness is greatly improved.

<Other embodiments>
The concavo-convex portions X, X,... According to the present invention are not limited to the configurations as in the first and second embodiments. For example, a concave dimple structure formed on the surface of a golf ball, An inverted convex dimple structure is also possible, and in each of these configurations, the heating power improvement effect of the inner pot side wall 3c portion exactly the same as in the above embodiments can be obtained.

  Note that the present invention is not limited to those described in the above embodiments in other parts other than the uneven portions X, X,... Of course, it is possible to change the design.

3 is the inner pot 3a is the bottom wall 3b is the corner (R)
3c is a side wall (non-heating part)
3d is the opening edge on the upper end side (flange)
4 is an inner case 5 is an outer cover C1 and C2 are first and second work coils (heating means)
G1 and G2 are first and second induction heating elements (heating means)
X is uneven part x is convex part y is concave part

Claims (3)

An inner pot having a bottom side heat generating part and a side wall side non-heating part; and heating means for heating the inner pot by causing the bottom side heat generating part to generate heat , and heating the inner pot by the heating means. An electric rice cooker configured to cook rice by forming an uneven portion extending from the lower end side toward the upper end portion on the outer surface of the side wall portion side non-heating portion of the inner pot. Electric rice cooker. An inner pot, the inner pot and a heating means for heating by electromagnetic induction, by heating the inner bowl by heating means, an electric rice cooker was set to raise cooked rice, the inner bowl An electric rice cooker characterized in that a heat generating part that generates heat by electromagnetic induction of the heating means and a non-heat generating part that does not generate heat by electromagnetic induction of the heating means are provided on the outer surface, and an uneven part is formed on the non-heat generating part. vessel. An electric rice cooker comprising an inner pot and heating means for heating the inner pot, wherein the inner pot is heated by the heating means to cook rice, the outer surface of the side wall of the inner pot to, to form a concave-convex portion extending toward the upper end from the lower end, an electric rice cooker, characterized in that a electric heater in a position facing to the irregular portion.

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