JP6161585B2 - Electric rice cooker - Google Patents

Description

  The present invention relates to an electric rice cooker that cooks rice by heating from an electric heating source using a heater or electromagnetic induction with a clay pot.

  Various earthenware pans for electromagnetic induction heating cookers are known (for example, see Patent Documents 1 and 2), and rice cookers that contain rice pots so that they can be attached and detached and cook rice using an electrical heating source are already known. (For example, refer to Patent Document 3). In any of the earthenware pots described in Patent Documents 1 and 2, a heating layer for electromagnetic induction heating is provided at the bottom even if there is a difference between the outer surface and the inner and outer surfaces, and cooking is performed by heating from the bottom by electromagnetic induction heating. ing. The thing of patent document 3 provides a magnetic heating member in the outer surface of the bottom part of a clay pot, performs electromagnetic induction heating by the magnetic coupling with the alternating magnetic field from an induction heating coil, and performs rice cooking.

JP 2005-296161 A JP 2005-334351 A JP-A-2005-413

  By the way, rice cooking is an important condition for cooking rice that is particularly delicious with uniform heating. In addition, if there is a partial temperature difference when the cooked rice is kept warm, condensation occurs, causing the rice to become sticky or whiten, so uniform heating is important.

  The inventors have studied the practical use of an electric rice cooker using a clay pot based on such a viewpoint, and while repeating the experiment and examination, the thermal conductivity of the clay pot is as small as 1/200 of aluminum. Thus, it has been found that high-power heating from the bottom is difficult to apply to rice cooking, and if the output is increased by that amount, local heating and abnormal heating of the heating source itself are caused. Further, it has been found that heat retention by low output heating from the side part also causes local heating.

  The inventors of the present invention have noticed that such experimental results have adopted the same thickness from the bottom to the top, such as conventional clay pots and clay pots described in Patent Documents 1 to 3. As a result, the deliciousness of rice cooked in a clay pot of equal thickness is accompanied by active convection across the water in the clay pot and across the rice, as the flame extends to the side to lick the outer surface of the clay pot, It seems that it is due to the fact that uniform heating can be achieved, whereas high power heating from the bottom with electric rice cooker does not reach that, and if this is handled by simply reducing the thickness of the clay pot, It was found that the drop-resistant strength was lowered and could not be used practically, and that heat retention at low output heating from the side face made it difficult for the bottom side to be heated, causing local heating and uneven heat retention. Based on such knowledge, the present inventors have found a condition that can suitably realize electric rice cooking and heat insulation in a clay pot, and have come up with the present invention.

  An object of the present invention is to provide an electric rice cooker that can be used for cooking rice and keeping warm the rice in a clay pot without impairing the drop-resistant strength based on the above knowledge.

In order to achieve the above object, an electric rice cooker of the present invention includes a clay pot, a main body that is housed so that the clay pot can be attached and detached, a lid that opens and closes the main body and the clay pot, and a curved portion at the outer periphery of the bottom of the clay pot. And an electromagnetic induction heating part provided in the central part surrounded by this, a bottom heating source consisting of a heating coil arranged on the main body side opposite to these, and a cylindrical side heating source for heating from the side part of the earthenware pot The portion provided with the electromagnetic induction heat generating portion between the curved portion and the central portion of the outer periphery of the bottom portion of the earthenware pot includes the electromagnetic induction heat generating portion, and is thin with respect to the portion facing the side heating source. The lower part of the thick part of the earthenware pot is covered with a cylindrical side heating source, and the lid is on the upper surface of the opening of the earthenware pan and faces the side heating source of the earthenware pot.
It is characterized by having a seal packing that is pressed and closed with a pressing width corresponding to the thickness of the part .

In such a configuration, the earthenware pot is housed so as to be detachable from the main body and is placed on the legs, and the electromagnetic induction heating part provided at the curved portion and the central part of the outer periphery of the bottom of the earthenware pot, and the main body facing these Even if the thickness of the opposed part to the side heating source is thin, the thickness of the side part is not enough to keep rice cooked or heated by heating from the bottom heating source and the side heating source consisting of the heating coil arranged on the side. The drop-resistant strength is not impaired due to the large size, the heat storage capacity is lowered by the amount of thinning the part facing the bottom heating source, making high power heating from the bottom heating source easier to live in rice cooking heating, and thicker Since the heat transfer to the side facing the side heating source is also promoted, rice can be cooked with uniform heating accompanied by active convection in the water in the clay pot and the entire area of the rice. In addition, since the facing part to the side heating source is thicker than the facing part to the bottom heating source and the heat storage capacity is high, low output heating from the side heating source is locally spread to the rice. Further, since heat transfer to a portion facing the bottom heating source having a small heat storage capacity is promoted, uniform heat retention is possible .

  Further objects and features of the present invention will become apparent from the following detailed description and drawings. Each feature of the present invention can be used alone or in combination in various combinations as much as possible.

According to the electric rice cooker of the present invention, in order to perform electric cooking of electric rice and rice in a clay pot, the curved portion and the central portion of the outer periphery where the electromagnetic induction heat generating portion at the bottom of the clay pot is provided are thin side heating sources With the thicker facing part, the practical drop-proof strength is ensured, and the thicker heat storage capacity is achieved while utilizing the high output heating from the bottom heating source for cooking rice heating at the part facing the thin bottom heating source with a small heat storage capacity. Delicious rice can be cooked with uniform heating by promoting heat transfer to the opposite side of the high side heating source. In addition, the opposed part to the bottom heating source with a small heat storage capacity while relaxing the low output heating from the side heating source locally on the rice because the opposed part to the side heating source is thick and the heat storage capacity is high The heat transfer to the water can be promoted to maintain a uniform temperature, and condensation due to temperature difference can be prevented. Furthermore, the leg part of the earthenware pan is placed with the electromagnetic induction heating part at the bottom of the earthenware pot between the peripheral part and the center part which are thinner than the side part without losing their thinness. Thermal safety can be achieved by floating the electromagnetic induction heating part from the main body side .

It is sectional drawing in the front-back direction which shows one example of the electric rice cooker which concerns on embodiment of this invention. It is sectional drawing in the left-right direction of the electric rice cooker of FIG. It is sectional drawing around the earthenware pot opening part of the electric rice cooker of FIG. It is sectional drawing of the half part in the left-right direction which shows another example of the electric rice cooker which concerns on embodiment of this invention. It is a partial cross section figure which shows another example of the earthenware pan of the electric rice cooker which concerns on embodiment of this invention. It is a partial cross section figure which shows the other example of the earthenware pan of the electric rice cooker which concerns on embodiment of this invention. It is a partial sectional view showing another example of the earthenware pot of the electric rice cooker according to the embodiment of the present invention. It is a partial cross section figure which shows another example of the earthenware pot of the electric rice cooker which concerns on embodiment of this invention. It is a comparison figure of the planar view circular earthenware pot and the square earthenware pot of the electric rice cooker which concerns on embodiment of this invention.

  Hereinafter, embodiments of the electric rice cooker according to the present invention will be described in detail with reference to FIGS. 1 to 9 to provide an understanding of the present invention.

  As shown in FIGS. 1 and 2, the electric rice cooker of the present embodiment includes a clay pot 1, a main body 2 that is housed so that the clay pot 1 can be attached and detached, a main body 2 and a lid 3 that opens and closes the clay pot 1, A bottom heating source 4 for heating from the bottom of the earthenware pot 1 and a side heating source 5 for heating from the side of the earthenware pot 1 are provided, and the facing part 1 a of the bottom heating source 4 of the earthenware pot 1 is connected to the side heating source 5. It is thinner than the facing part 1b. In this way, the earthenware pan 1 is housed so as to be detachable from the main body 2, and the rice cooking and rice are kept warm by heating from the bottom heating source 4 and the side heating source 5. It is for cooking rice, and the side heating source 5 is for heat insulation. However, it is not restricted to this, Both can be used for cooking rice or can be used for heat insulation.

  The earthenware pot 1 may be mainly made by firing porcelain, but also includes ceramics, and various known ones can be adopted. The bottom heating source 4 includes a heating coil 4a1 under the bottom of the earthenware pot 1, an outer peripheral part of the bottom of the earthenware pot 1, in the illustrated example, a heating coil 4a2 around the bottom curved part or the bottom rounded part, and an alternating magnetic field from these heating coils 4a1, 4a2. The conductive layers 4b1 and 4b2 generate eddy currents and generate heat. The conductive layers 4b1 and 4b2 are provided on the outer surface of the earthenware pot 1 with a silver paste coating layer of about 10 to several tens μm, a silver foil bonding layer, or silver The vapor deposition layer of etc. may be sufficient. However, materials and layer formation methods can be freely selected. The side heating source 5 is composed of a heater 5a, and is equipped by being sandwiched between a pressing plate 5c and an outer surface of a heat radiating plate 5b such as aluminum, a steel plate, and stainless steel facing the side portion of the earthenware pot 1.

  The main body 2 has a hollow shape having an outer case 11 and an inner case 12, and the inner case 12 is formed by sandwiching the heat radiating plate 5b between a resin bottom protective frame 12a and a resin upper protective frame 12b. The heating coils 4a1, 4a2 are arranged around the outer periphery of the bottom protective frame 12a, the heating coil 4a1 is held on a resin-made central coil base 13a, and the heating coil 4a2 is supported by an outer peripheral coil base 13b supported by the central coil base 13a. Hold and provide. Although the bottom protective frame 12a and the top protective frame 12b are conventionally formed of PET, since the heat resistant temperature is as low as about 150 ° C. and there is a concern about the thermal influence from the heater 5a, the heat resistant temperature is set as high as about 250 ° C. . Ferrite 17 is disposed on the outer circumference of the central coil base 13a and the outer coil base 13b so as to stabilize the alternating magnetic field formed by the heating coils 4a1 and 4a2. A heat insulating layer 14 made of ceramic or the like is provided on the bottom of the bottom protective frame 12a, and an air gap 15 is formed between the bottom of the earthenware pot 1 to prevent a thermal influence below the bottom of the main body 2. This air gap 15 is an elastic support base made of silicon rubber or the like shown in FIG. 2 in which annular leg portions 1d formed on the outer periphery of the bottom of the earthenware pot 1 are provided at about three locations on the circumference of the outer periphery of the bottom protective frame 12a. 16 is secured at a height supported by 16.

  The exterior case 11 has a structure in which a body 11c made of metal such as a steel plate or stainless steel is sandwiched between a bottom member 11a made of resin such as PET and a shoulder member 11b, and the inner peripheral side of the shoulder member 11b is connected to the upper protective frame 12b. The hollow case 2 is formed with the interior case 12, and the earthenware pot 1 is received so as to be detachable leaving the air gap 18 between the interior case 12, and placed on the elastic support base 16, A flange 1c at the upper end of the earthenware pan 1 forms an air gap 19 shown in FIG. 1 on the shoulder member 12b. In addition, as shown in FIG. 2, recesses 21 for facilitating clues to the flange 1 c are formed between the left and right portions of the shoulder member 11 b, as shown in FIG. 2. A handle 118 that reaches the shoulder member 11b and has a bearing is provided on the upper portion of the body portion 11c.

  A temperature sensor 22 is provided in the center of the central coil base 13a, and is urged by the spring 23 so as to penetrate the bottom protective frame 12a and the heat insulating layer 14 so as to always protrude thereon, and is placed on the elastic support base 16. The temperature of the earthenware pot 1 can be monitored by pressing against the bottom of the earthenware pot 1. On the other hand, a power supply substrate 24 that supplies power to the heating coils 4a1, 4a2, the heater 5a, and the like, a temperature detected by the temperature sensor 22, an operation signal from an operation unit 25 provided obliquely above the front portion of the main body 2, and the like A control board 26 for controlling power supply from the power supply board 24 is provided, and an operation board 27 equipped with a switch, a display lamp, a liquid crystal display section and the like corresponding to the operation is provided inside the operation section 25. The power supply substrate 24 includes a heating element such as an IGBT that drives the heating coils 4a1 and 4a2 at a high frequency, and is arranged vertically near the front portion of the interior case 12 so as to be positioned on the fan installation portion 28 of the bottom member 11a. It is sandwiched between the bottom protective frame 12a and the central coil base 13a and cooled by a fan (not shown). The control board 26 is supported by being sandwiched between the shoulder member 11 b and the bottom member 11 a of the outer case 11, is positioned substantially parallel to the inside of the operation board 27, and is arranged far away from the power supply board 24. It is designed to receive air from the fan.

  The lid 3 is supported at the rear of the main body 2 so as to be opened and closed by a shaft 31, and has a double structure of an outer lid 33 for opening and closing the main body 2 with its shoulder member 11b and an inner lid 34 for opening and closing the earthenware pot 1. It is as. The inner lid 34 is formed by mounting a resin outer frame 34b on the outer periphery of a heat sink 34a serving as a saucer made of aluminum, steel plate, stainless steel, etc., and sandwiching the base between the heat sink 34a and the outer frame 34b. A cylindrical seal packing 34 c is in close contact with the flange 1 c of the earthenware pot 1 from above to close the earthenware pot 1. The outer lid 33 is formed of a resin outer plate 33a and a resin inner plate 33c fitted with a metal plate 33b at the center, and is formed in a hollow shape, and a vapor discharge chamber having a pressure regulating check valve 35 at the center. 36 is provided, the steam flowing into the steam discharge chamber 36 through the steam hole of the heat radiating plate 34a is separated and released to the outside, and the separated powder is returned to the heat radiating plate 34a, and the heat radiating plate 34a It flows out upward and returns to the earthenware pot 1 appropriately while accumulating the rice cake returned from the vapor discharge chamber 36.

  For such steam treatment, a lock mechanism 41 that locks the outer lid 33 in a closed state is provided between the front portion, which is a free end of the outer lid 33, and the shoulder member 11b of the main body 2. A seal-shaped seal 33d sandwiched between the inner plate 33c and the metal plate 33b of the lid 33 is pressed against the outer peripheral upper surface of the inner lid 34 to prevent vapor leakage between them, and at the same time presses the inner lid 34 The seal packing 34c is pressed against the flange 1c of the earthenware pot 1 to prevent steam leakage between them. When the outer lid 33 is closed against the spring 42 biased in the opening direction, the locking mechanism 41 has a locking lever 45 in which the front locking portion 43 is pivotally supported on the shoulder member 11b by the shaft 44 at the final stage. 1 is pushed to the lock stable position around the shaft 44 shown in FIG. 1 to complete the closing, and the lock lever 45 is also rotated around the shaft by the urging of the spring 42. It is stretched and cannot be turned to the unlocking side, but is locked in the closed state. In this locked state, the operation portion 45b of the lock lever 45 protrudes on the shoulder member 11b as shown in the figure, and when this is pushed forward, the locking piece 45a is lifted along with the front portion of the outer lid 33, and thereafter The outer lid 33 is automatically opened while rotating the lock lever 45 by the bias of the spring 42. However, the outer lid 33 and the inner lid 34 may be integrally opened and closed, and in that case, the inner lid 34 can be removed from the outer lid 33 as necessary.

  With the above configuration, the cooking of rice using the earthenware pot 1 and the warming of the cooked rice are automatically achieved by the control program, the user's selection, and the setting operation. Especially in this Embodiment, although the opposing part 1a with the bottom part heating source 4 of the earthenware pot 1 is made thinner than the opposing part 1b with the side part heating source 5, it is a leg as a mounting part in the outer peripheral part of a bottom part. The drop-resistant strength is not impaired by cooperation with the large thickness of the facing portion 1b facing the side heating source 5 having the portion. In particular, the required strength when falling in an upright posture is satisfied. Then, the heat storage capacity is lowered by the amount of thinning of the facing portion 1a with the bottom heating source 4 so that the high output heating from the bottom heating source 4 makes it easier to live in rice cooking heating, and the facing with the thick side heating source 5 It also promotes heat transfer to the part 1b. Therefore, the rice in the uniform heating accompanied by the active convection in the water in the earthenware pot 1 and the whole area | region of rice is implement | achieved. Moreover, the opposing part 1b with the side part heating source 5 is thicker than the opposing part 1a with the bottom part heating source 4, and the heat storage capacity is high, so that the low output heating from the side part heating source 5 reaches the rice locally. Along with the relaxation, heat transfer to the facing portion 1a with the bottom heating source 4 having a small heat storage capacity is promoted. Therefore, uniform heat retention is possible. Here, the side of the earthenware pot 1 is thick at the top and the lower part is thin, including the bottom rounded part of the earthenware pot 1, but the thin area extends to the side area where the drop strength of the earthenware pot 1 is full. By doing, the rice cooking characteristic in the uniform heating by the high output heating from the bottom part heating source 4 using the thin part of the earthenware pot 1 further increases. Between the thick wall portion and the thin wall portion of the earthenware pot 1, the outer surface of the earthenware pot 1 is continuously formed with a rounded stepped portion D, and a relatively abrupt thickness change is achieved without stress concentration.

  Here, if one example is shown, it is made of a ceramic mainly composed of mullite and cordierite, and a glass-based glaze where the mainstream is a uniform thickness of about 10 to 15 mm in a normal clay pot. With respect to the earthenware pot 1 subjected to sealing treatment, the thickness of the facing portion 1a with the bottom heating source 4 is about 3 to 4 mm, and the thickness of the facing portion 1b with the side heating source 5 is about 7 to 8 mm. Was obtained, and cooked rice by uniform heating and uniform heat insulation could be realized. From such a dimensional relationship, the difference in thickness between the thick portion and the thin portion of the earthenware pot 1 can be approximately doubled. In addition, since there is no heating source between the heat sink 5b of the heater 5a and the conductive layer 4b2 facing the heating coil 4a2, the smaller the thickness of the clay pot 1 is, the more advantageous for uniform heating during cooking, and about 3 mm. In some cases, it may be thinner than the facing portion 1a of the earthenware pot 1 facing the bottom heating source 4 on condition that the drop-proof strength is satisfied.

  In addition, in this example, as shown in FIG. 3, the opening part of the earthenware pot 1 is thickened only t from the side part, for example inside. Thereby, although the opening part of the earthenware pot 1 is easily affected by the outside air due to the lid closing structure, the temperature tends to decrease, but the heat storage capacity increases due to the increased thickness t from the side part of the opening part, and the heat at the time of cooking rice is increased. It is possible to store the heat and suppress the temperature drop due to the outside air, and it is possible to prevent the occurrence of dew condensation due to the temperature difference even at the start of heat retention immediately after cooking of rice with a lot of moisture. If the thickness t is too large, it takes too much time to raise the temperature. Therefore, the thickness t is preferably less than 6 mm. If the thickness t is too small, a heat storage effect cannot be obtained. Further, the seal packing 34 c of the inner lid 34 is in a positional relationship such that it is pressed against the flat upper surface 1 e of the flange 1 c of the clay pot 1. Further, it is more preferable that the flat upper surface 1e is substantially horizontal. As a result, the molding error of the opening of the earthenware pot 1 increases to ± 2 to 4 mm as compared to ± 0.5 mm when the metal pot is seen as a radius, but in such an error range, the seal packing 34 c has an upper surface of the flange 1 c. It does not deviate from 1e, and the press contact width and the seal width can be increased to prevent the seal from coming off due to foreign matter biting, and the problem of poor sealing can be avoided. For this purpose, if the thickness t from the side of the opening of the earthenware pot 1 is increased inward, it is advantageous to make the upper surface 1e of the flange 1c wider. Moreover, the outer peripheral part of the flange 1c is also made thicker by t1 than the inner peripheral side which is substantially the same thickness as the side part of the earthenware pot 1, thereby increasing the strength of the opening of the earthenware pot 1. The increase in thickness in this case has an advantage that it is easy to prevent the juice leakage to the outside on the upper surface of the flange 1c by facing upward as shown in the figure. Furthermore, the leg 1d of the earthenware pot 1 is positioned between the conductive layers 4b1 and 4b2, and can be positioned when the conductive layers 4b1 and 4b2 are attached. However, as shown in FIGS. 1 and 2, the conductive layers 4b1 and 4b2 can be provided in an embedded state on the surface of the earthenware pot 1, and the concave portions for that purpose are positioned when the conductive layers 4b1 and 4b2 are provided. If 4b1 and 4b2 are provided so as to be flush with the outer surface of the earthenware pot 1, it is easy to prevent the inconvenience that the surroundings of the conductive layers 4b1 and 4b2 are caught and peeled when the earthenware pot 1 is washed. If a heat insulating wall 145 is provided around the outside of the heater 5a, the heat of the heater 5a can be efficiently utilized for heat insulation without escaping to the outside.

  In the example shown in FIG. 4, the side heating source 5 is composed of a heating coil 5 d and a conductive layer 5 e that generates heat by an eddy current generated by an alternating magnetic field from the heating coil 5 d, and the conductive layer 5 e is the inner surface of the earthenware pot 1. Is provided. Since the heat generated by the conductive layer 5e directly heats the rice, the energization is controlled so that the heating is lower than that of the heater 5a in the previous example, thereby avoiding the problem of local heating. However, the conductive layer 5e can be provided on the outer surface of the earthenware pot 1, or if it is thin and there is no problem in the difference in thermal expansion coefficient from the earthenware pot 1, it can be provided embedded in the earthenware pot 1 if there is no problem. The same applies to the heating coils 4a1 and 4a2. The heating coil 5d is installed by making the shoulder member 11b a double structure inside and outside and sharing it with the protective frame and the coil base. In addition, the heating coil 5d and the conductive layer 5e are extended and provided to the position higher than the previous example of the side part of the earthenware pot 1, and the heating area at the time of rice cooking is expanded.

  When the concave and convex portions as shown in FIG. 5 are formed in a concentric arrangement at a predetermined pitch on the inner surface of the bottom of the earthenware pot 1, the surface area of the inner surface of the bottom of the earthenware pot 1, that is, the heating area for water and rice is expanded compared to the heat receiving area of the outer surface. In addition to improving the heating efficiency, the heat conduction of the thin part formed by the concave part is higher than that of the thick part formed by the convex part. Thus, uniform convection can be generated, which further enhances the uniform heating characteristics during cooking.

  The example shown in FIGS. 6 and 7 shows another conductive layer 4f as a heating element provided in the earthenware pot 1, and heat conduction to the earthenware pot 1 is formed by forming rectangular or round irregularities on the heat conduction surface toward the earthenware pot 1 side. The surface is expanded to increase the heating efficiency of the clay pot 1 and the inside thereof. Further, in this case, even in the thin wall portion of the earthenware pot 1 formed by the unevenness of the conductive layer 4f, the generation of bubbles due to early temperature rise and the convection effect due to early boiling as in the example of FIG. 5 can be exhibited.

  In the example shown in FIG. 8, the heating efficiency from the conductive layer 4 f to the earthenware pot 1 is increased by forming irregularities on the outer surface of the earthenware pot 1 and providing the conductive layer 4 f. Also in this case, generation of bubbles due to early temperature rise and convection effect due to early boiling as in the example of FIG.

  Furthermore, if the heat insulating layer 4g is provided on the back surface of the conductive layer 4f as in each example shown in FIGS. 6 to 8, heat can be prevented from escaping to the outside, and this also increases the heating efficiency.

  Although the earthenware pot 1 having a circular shape in plan view is used in the above-described thing, if the earthenware pot 101 having a square shape in plan view is used as shown in FIG. 9, the hatched portion in FIG. The cross-sectional area increases, and the height H2 of the earthenware pot 101 can be made the same capacity by making the height H2 of the earthenware pot 101 smaller than the height H1 of the earthenware pot 1 by the increase of the cross-sectional area. Therefore, although the earthenware pots 1 and 101 are easy to be bulky compared with a metal pan, they are provided low in volume by making it square.

  The present invention is an electric rice cooker using a clay pot, and achieves uniform heating and uniform heat insulation without impairing the drop strength of the clay pot.

DESCRIPTION OF SYMBOLS 1 Earthenware pot 1a, 1b Opposite part 1c Flange 2 Main body 3 Cover body 4 Bottom heating source 4a1, 4a2 Heating coil 4b1, 4b2 Conductive layer 5 Side heating source 5a Heater 5b Heat sink 5c Holding plate 5d Heating coil 5e Conductive layer 11 Exterior case 12 Inner case t

Claims (2)

Clay pot,
A main body that is housed so that this clay pot can be attached and detached,
A lid that opens and closes the main body and earthenware pot;
A bottom heating source consisting of a heating coil disposed on the main body side opposite to the electromagnetic induction heating part provided in the curved part of the outer periphery of the bottom part of the earthenware pot and the central part surrounded by this,
A cylindrical side heating source that heats from the side of the earthenware pot,
The portion provided with the electromagnetic induction heat generating portion of the curved portion and the central portion of the outer periphery of the bottom of the earthenware pot includes this electromagnetic induction heat generating portion, and the thickness is thin with respect to the portion facing the side heating source,
The lower part of the thick part of the clay pot is covered with a cylindrical side heating source,
An electric rice cooker characterized in that the lid body has a seal packing which is pressed and closed on the upper surface of the opening portion of the earthenware pot with a pressure contact width corresponding to the thickness of the facing part of the side pot of the earthenware pot. Clay pot,
A main body that is housed so that this clay pot can be attached and detached,
A lid that opens and closes the main body and earthenware pot;
A bottom heating source consisting of a heating coil disposed on the main body side opposite to the electromagnetic induction heating part provided in the curved part of the outer periphery of the bottom part of the earthenware pot and the central part surrounded by this,
A cylindrical side heating source that heats from the side of the earthenware pot,
The portion provided with the electromagnetic induction heat generating portion of the curved portion and the central portion of the outer periphery of the bottom of the earthenware pot includes this electromagnetic induction heat generating portion, and the thickness is thin with respect to the portion facing the side heating source,
The outer peripheral part of the part where the thick part of the earthenware pan changes to the thin part is covered with the side heat source ,
An electric rice cooker characterized in that the lid body has a seal packing which is pressed and closed on the upper surface of the opening portion of the earthenware pot with a pressure contact width corresponding to the thickness of the facing part of the side pot of the earthenware pot.