JP2009240447A - Electric rice cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric rice cooker capable of more delicious cooking without cooking unevenness and hot insulation unevenness and insulating heat by following a partial difference in wall thickness for utilizing heat storing property by employing a nonmetallic pot. <P>SOLUTION: The electric rice cooker includes a heating source 6 constituted of: a heater 4 arranged in the nonmetallic pot 1; and a heating coil 5 arranged in a body 2 side accommodating the pot 1 and induction heating the heater 4 by an alternating magnetic field, wherein at least the heater 4 of the heating source 6 is arranged in the bottom portion 1a side and the lateral portion 1b side with different thicknesses of the pot 1 for cooking and insulating heat by energizing and controlling the heating coil 5. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention comprises a heating source comprising a heating element provided in a non-metallic pot such as an earthen pot, and a heating coil provided on the main body side that accommodates the pot to cause the heating element to inductively generate heat using an alternating magnetic field, The present invention relates to an electric rice cooker that performs energization control of a heating coil and performs rice cooking and heat insulation.

  There is known an electric rice cooker that heats the pan itself by an alternating magnetic field from a heating coil provided on the side of the main body that houses the pan, and performs rice cooking and heat insulation (see Patent Document 1). There is already known an electric rice cooker that is provided with a heating element that generates heat by electromagnetic induction in a metal pan, is heated by an alternating magnetic field from a heating coil on the main body side that accommodates the pot, and performs rice cooking and heat insulation (for example, (See Patent Documents 2 and 3).

  Patent Document 1 discloses a first heating coil opposed to the bottom, a second heating coil opposed to the bottom side, and a side surface of the pan having a uniform thickness compared to a non-metallic pan. A technique is disclosed in which a third heating coil is provided to generate heat at three opposite positions of the pan.

Patent Documents 2 and 3 show that non-metallic pots represented by clay pots have low thermal conductivity, and clay pots are as small as 1/200 of aluminum, and are thick, so heat storage is good and heat is easily generated. It is easy to cook rice deliciously when it is used by heating directly on an open fire, and it has good heat retention after cooking, while heat is easy to escape at the top when keeping warm. The technique which raises heat storage property by making the side part side thicker than the bottom part side of a pan, and improves the heat retention in the upper part of a pan is disclosed. As a result, just taking out the pan after cooking and placing it on a table with a non-metallic lid, it was possible to keep the food warm enough during the meal and to eat the rice deliciously. Such a feature cannot be obtained at all with a relatively thin metal pan as described in Patent Document 1. In addition, Patent Documents 2 and 3 make use of the fact that they can be maintained when they reach a high heat storage property on the side side, which is thicker than the bottom of a non-metallic pan, and the control temperature of rice cooking or heat insulation. A technique is also disclosed in which a heater is wound around the outer peripheral surface of the heat radiating plate facing the inner periphery of the interior case of the main body, and the thick portion of the pan is radiantly heated to ensure the control temperature for rice cooking and heat retention.
JP 2002-330865 A JP 2007-244558 A JP 2007-260324 A

  However, in the electric rice cookers disclosed in Patent Documents 2 and 3, cooking unevenness and warming unevenness sometimes occur. As a result of various experiments conducted by the inventor in this regard, as a result of repeated investigations, the control temperature that is the target for control or the temperature detected by the pan that is the basis for temperature control during the temperature rising operation in the rice cooking process or the heat retaining process. On the other hand, the temperature rise on the side part, which is the thick part of the pan, is more likely to be delayed compared to the others, and it is sometimes experienced that temperature unevenness occurs. It causes motion noise and tunnel reflection.

  The purpose of the present invention is based on such new knowledge and adopts non-metal pots such as earthen pots to cook rice and keep warm, following the partial difference in thickness to make use of heat storage. In addition, it is to provide an induction heating type electric rice cooker that can cook more delicious rice without uneven cooking and warming, and can keep warm more deliciously.

  In order to achieve the above object, the electric rice cooker of the present invention includes a heating element provided in a non-metallic pan, and a heating element provided on the main body side that accommodates the pot, and induction heating of the heating element by an alternating magnetic field. In the electric rice cooker comprising a heating coil to be heated and comprising a heating source, and performing heating control and heating of the heating coil to cook rice or keep warm, at least the heating element of the heating source is arranged on the bottom side and the side side where the thickness of the pan is different. It is characterized by the distribution.

  In such a configuration, a heating element provided in a non-metallic pan is heated by an alternating magnetic field from a heating coil on the main body side that accommodates the pot to cook rice or keep warm, but the heating composed of the heating element and the heating coil is performed. Since at least the heating element of the source is divided and provided on the bottom side and the side side where the thickness of the pan is different, in the heat generation state according to the thickness difference between the bottom side and the side side of the pan with low thermal conductivity Thus, it is possible to realize the heat conduction condition of the above, so that the thick part is not delayed from the other part with respect to the control temperature or the detected temperature as compared with the small part.

  In the above, the side heating element may be further provided below the top of the inner side surface of the pan.

  In such a configuration, in addition to the above, the side heating element is positioned below the top of the side inner surface of the pan, so the side portion side of the pan is thicker than the bottom side to enhance the heat retaining function. Corresponding to the above, when the temperature compensation is performed by increasing the heat generation capacity of the heating element, it is possible to prevent the temperature from reaching the top of the inner surface which is easy for the user of the pan to touch.

  In the above, the side heating element may be further provided below the connecting portion between the shoulder member that connects the upper end of the exterior case of the main body and the upper end of the interior case, and the interior case.

  In such a configuration, in addition to the above, since the side heating element is located below the connecting portion between the shoulder member connecting the upper end of the exterior case and the upper end of the interior case and the upper end of the interior case, In order to increase the heat generation capacity of the heating element and compensate the temperature in response to making the side part side thicker than the bottom part side, the temperature of the heating element can be increased to the area facing the shoulder member. Can be prevented.

  In the above, further, the side portion side has a lower side half side region connected to the rising region of the outer periphery of the bottom side of the pan thicker than that, and a side side upper half region connected to this side more thickly, In any case, a heating source may be provided.

  In such a configuration, in addition to the above, in addition to the above, the thickness of the pan rises on the outer periphery on the bottom side, on the side side, and on the lower half is such that the bottom side rise area <the lower side on the side side <the upper half area on the side side Satisfying this relationship, heat insulation gradually increases from the bottom side to the side part, and there are heating elements in both the lower half side area and the upper half area on the side side, from the bottom side to the side side. It is possible to increase the temperature more evenly by eliminating or reducing the difference in the calorific values of the respective heating elements.

  In the above, the side heating element may be characterized in that the heating value is partially different from the heating coil that is partially different from the side heating element.

  In such a configuration, in addition to the above, the side heating element is further arranged to distribute the heating elements by partially opposing the heating coils that are partially different from each other so that the heating elements are arranged differently. The amount of heat generated can be varied partially without changing the thickness.

  According to the electric rice cooker of the present invention, a pan having a low thermal conductivity is provided by distributing at least a heating element of a heating source and a heating coil as a heating source with respect to a bottom side and a side side having different thicknesses of the pot. The heat conduction condition in the heat generation state required according to the difference in thickness between the bottom side and the side part of the material is realized. Without delaying the portion, it is possible to prevent cooking unevenness and heat retention unevenness and the resulting dew condensation, and cook rice and heat retention more deliciously.

  In addition to the above, the side heating element is positioned below the top of the inner surface of the side of the pan, so that the side of the pan is thicker than the bottom and the heat retaining function is enhanced. Thus, even if the heat generation capacity of the heating element is increased to compensate for the temperature, the temperature is not increased to the top of the inner surface where the user of the pan is easy to touch, and the use is safe.

  In addition to the above, since the side heating element is located below the connecting portion between the shoulder member connecting the upper end of the exterior case and the upper end of the interior case and the upper end of the interior case, the side portion of the pan Corresponding to increasing the heat retention function by making the side thicker than the bottom side, even if the heat generation capacity of the heating element is increased and temperature compensation is performed, the temperature does not rise to the area facing the shoulder member, It is not necessary to ensure heat resistance up to the shoulder member forming the upper end portion.

  In addition to the above, the thickness of the pan rises on the bottom side outer periphery, the lower side on the side, and the upper half region is the rise region of the bottom side outer circumference <the lower side on the side side <the upper half side on the side side By satisfying the relationship, the heat retaining property is gradually increased from the bottom side to the side portion, and there is a heating body in both the lower and upper half regions of the side portion, and from the bottom side to the side side. Eliminating or reducing the difference in the amount of heat generated by each heating element, the temperature can be raised more easily and more uniformly, so that the rice can be cooked and kept warm even more comfortably without uneven cooking or warming.

  In addition to the above, the side heating element faces the heating coil that is partially different, and the heating value is partially changed so that the heating element is not distributed and the thickness is not changed partially. The amount of heat generated can be partially varied, and the amount of heat generated between smaller regions can be adjusted by a simple heating element.

  Hereinafter, embodiments of the electric rice cooker according to the present invention will be described in detail with reference to FIGS. 1 to 8 to provide an understanding of the present invention. In addition, the following description is a specific example of this invention, Comprising: The content of description of a claim is not limited.

  The electric rice cooker of the present embodiment, as in each example shown individually in FIG. 1 to FIG. 8, mainly a non-metallic pot 1 such as an earthen pot, and a main body 2 accommodated so that the pot 1 can be attached and detached, A lid 3 that opens and closes the main body 2 and the pan 1, and a heating source 4 including a heating element 4 provided in the pan 1 and a heating coil 5 that is provided on the side of the main body 2 and induces heat generation by an alternating magnetic field. For example, the high-frequency energization through the IGBT element to the heating coil 5 is inverter-controlled based on the temperature information from the temperature sensor 7 represented by the phantom line in FIG. Cooked rice as one of the set cooking modes, or cooked rice and kept warm.

  The non-metallic pot 1 may be mainly made by firing porcelain clay, but also includes ceramics, and various known ones can be adopted. The heating element 4 of the bottom heating source 6 is a conductive layer that generates heat by generating an eddy current by an alternating magnetic field from the heating coil 5, and is obtained by printing a silver paste of about 10 to several tens μm provided on the outer surface of the pan 1. It may be a coating layer, a laminated layer of silver foil, a silver deposition layer, an embedded layer, or the like. However, the conductive material and the layer formation method can be freely selected.

  As already described, the non-metallic pan 1 has excellent heat retention but low thermal conductivity. In order to make use of this characteristic for both cooking and heat insulation, the present applicant increases the heat storage property by making the side 1b side thicker than the bottom 1a side of the pan 1 and improves the heat retention at the top of the pan 1. Even if you just take out the pan after cooking rice and put it on a table with a non-metallic lid, you can keep warm enough during meals and eat rice deliciously. . In addition, the main body utilizing the high heat storage on the side 2 side, which is thicker than the bottom 1 side of the non-metallic pan 1, can also be maintained when it reaches the control temperature of rice cooking and heat insulation, A technique is also proposed in which a heater is wound around the outer peripheral surface of the radiator plate facing the inner periphery of the interior case 2a, the thick portion of the pan 1 is radiantly heated to compensate the temperature, and the control temperature for cooking rice and keeping warm is ensured. ing.

  However, with the temperature compensation function of this type, the side 2b side is less likely to match the rate of temperature rise over the difference in thermal conductivity due to the difference in thickness from the outer surface to the inner surface side relative to the bottom 2a side. This can cause unevenness of heat and unevenness of heat retention and condensation.

  To cope with this, in the present embodiment, first, as in each example shown individually in FIGS. 1 to 8, at least the heating element 4 of the heating source 6 is placed on the bottom 1 a side where the thickness of the pan 1 is different. The bottom heat generating elements 4a and 4b and the side heat generating elements 4c on the side 1b side are provided separately. As a result, the heating element 4 provided in the non-metallic pan 1 is heated by an alternating magnetic field from the heating coil 5 on the main body 2 side in which the pan 1 is housed to cook rice or keep warm. At least the heating element 4 of the heating source 6 composed of the coil 5 is divided into a bottom inner heating element 4a, 4b, etc. on the bottom 1a side and a side heating element 4c, etc. on the side 1b side. Therefore, the heat conduction condition in the heat generation state corresponding to the difference in thickness is realized between the bottom 1a side and the side 1b side of the pan 1 having low thermal conductivity, and the thick part is smaller than the small part. It is possible to keep behind the other portions with respect to the control temperature or the detected temperature. In particular, the temperature rise difference and the temperature difference that increase between the upper and lower inner surfaces with the thickness change portion of the step portion D as a boundary are reduced.

  As a result, the pan 1 having a low thermal conductivity is provided by distributing at least the heating element 4 of the heating source 4 and the heating coil 5 to the bottom 1a side and the side 1b side where the thickness of the pot 1 is different. The heat conduction condition in the heat generation state required according to the difference in thickness between the bottom 1a side and the side 1b side of 1 is realized, and the thick part, specifically, the side 1b side is small, Specifically, compared to the bottom 1a side, the control temperature or the detected temperature is not delayed to other parts, and cooking unevenness, heat retention unevenness, and dew condensation caused thereby are prevented, and rice cooking and heat insulation can be performed more deliciously.

  In addition, the side heating element 4c and the like are provided below the top of the side inner surface of the pan 1, and the side heating element 4c is positioned below the top of the side 1b inner surface of the pan 1, Corresponding to the side 1b side of the pan 1 being thicker than the bottom 1a side to enhance the heat retaining function, even if the heat generation capacity of the side heating element 4c etc. is increased to compensate the temperature, the user of the pan 1 touches The top of the inner surface, which is easy to reach, is not heated to a high temperature, making it safe to use.

  Further, the side heating element 4c and the like are provided below a shoulder member 2c for connecting the upper end of the exterior case 2b of the main body 2 and the upper end of the interior case 2a, and a connecting portion 2d after the interior case 2; Since the partial heating element 4c and the like are positioned below the connecting portion 2d between the shoulder member 2c and the upper end of the interior case 2a, the side 1b side of the pan 1 is made thicker than the bottom 1a side to enhance the heat retaining function. Correspondingly, even if the heat generation capacity of the side heating element 4c or the like is increased to compensate for the temperature, the area facing the shoulder member 2c does not reach a high temperature, and the shoulder member 2c does not need to be considered for heat resistance. Accordingly, as shown in the illustrated example, in order to make the interior case 2a and the shoulder member 2c made of resin, the interior case 2a needs to be made of heat-resistant resin, but the shoulder member 2c need not be made of heat-resistant resin, and the cost is accordingly increased. The rise can be suppressed.

  Here, the bottom 1a side of the pan 1 having a smaller thickness than the side 1b side has a rising area 1a2 that curves and rises from the flat central area 1a1 to the side 1b, and is rounded from the rising area 1a2. Continuing to the side 1b side with the stepped portion D, achieving a relatively steep switching without stress concentration, and forming an annular hill 1f at the boundary between the central region 1a1 and the rising region 1a2 Yes. In such a form, the mounting strength, the drop strength, particularly the drop strength in the established posture are satisfied, and the heat retaining property and the heat storage property on the side portion 1b side are satisfied.

  Specifically, the bottom 1a side of the pan 1, that is, the central area 1a1 and the rising area 1a2 are thinner than the side 1b side and have a smaller heat capacity, so that they are provided in the central area 1a1 and the rising area 1a2 important for rice cooking. The primary heating by the direct heat conduction by the heat from the heating elements 4a and 4b and the secondary heating by the heat reflected from the heat-resistant plate 11 provided thereunder are obtained, and the heating efficiency is further improved and relatively low energization It can contribute to good rice cooking by realizing sufficient cooking rice heating while suppressing the capacity. Moreover, the side 1b side is thicker than the bottom a side and has a higher heat storage capacity, so that the temperature lowering during the heat retention following rice cooking is slow, and the temperature unevenness is less likely to occur during the temperature rising and lowering, and the side heating element 4c. With efficient heating by direct heat conduction from the side, the necessary temperature compensation can be achieved while increasing the rate of temperature rise that is likely to be insufficient on the side 1b side, and can contribute to good rice cooking and heat insulation.

  In particular, in the example shown in FIG. 1, each of the bottom heating elements 4a and 4b and the side heating elements 4c is opposed to the individual bottom heating coils 5a and 5b and the side heating coils 5c, respectively, 6b and 6c are configured, and different heating control can be performed by energization control independent of each other. Therefore, it is easy to satisfy the thermal conditions necessary for each part of the pan 1.

  In addition to the central area 1a1 on the bottom 1a side having the heating elements 4a and 4b, the pot 1 is heated by the high power from the bottom heating elements 4a and 4b by the amount of the rising area 1a2 being thin and the heat storage capacity being reduced. And facilitates heat transfer to the thick side 1b. Therefore, the rice cooking by the uniform heating accompanied by the active convection in the water in the pan 1 and the whole area of the rice is sufficiently realized together with the direct heat conduction from the heating element 4c to the side portion 1b.

  For example, in a typical earthenware pot, the mainstream is a uniform thickness of about 10 to 15 mm, which is made of a ceramic mainly composed of mullite-cordierite and sealed with a glass-based glaze. About the processed pan 1, the thickness of the bottom 1a side is about 3-4 mm, the thickness of the side 1b side is about 7-8 mm, and sufficient drop resistance is obtained, and rice cooking by uniform heating and uniform heat insulation are realized. did it. From such a dimensional relationship, the difference in thickness between the bottom 1a side and the side 1b side of the pan 1 can be approximately doubled. Correspondingly, it is preferable that the silver amount of the side heating element 4c is substantially equal to the addition amount of the silver amount of the bottom heating element 4a and the silver amount of the bottom heating element 4b.

  Furthermore, the opening part of the pan 1 is made thick from the side part, for example to the inner side. Thereby, although the opening part of the pan 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 increase in thickness from the side part of the opening part, and the heat during cooking is stored. Thus, it is possible to suppress a decrease in temperature due to the outside air, and it is possible to prevent the occurrence of condensation due to a temperature difference even at the start of heat retention immediately after cooking rice with a lot of moisture. If such a thickness increase is too large, it takes too much time to raise the temperature, so it is preferably less than 6 mm. If it is too small, a heat storage effect cannot be obtained, so it is preferable to set it to about 3 mm or more. A metal inner lid 7 provided so as to close the pan 1 inside the lid 3 has a seal packing 12 that presses against the flat upper surface 1d of the outward flange 1c of the pan 1, and forms the opening of the pan 1. Although the error is ± 2 mm when the metal pan is ± 0.5 mm in terms of radius, the seal packing 12 does not come off from the upper surface 1 d of the flange 1 c within such an error range, and the pressure contact width In addition, the seal width can be increased to prevent the seal from coming off due to the biting of foreign matter, and the problem of seal failure can be avoided. Moreover, the flange part 1c raises the heat storage property in the opening part of the pan 1, and contributes also to the improvement of heat retention performance.

  Further, according to the experiments of the present inventors, the heat generation amount of the bottom heating elements 4a and 4b tends to show a temperature distribution in which the temperature is high in the central part and the temperature is low on the peripheral side in the radial direction. As the dimensions increase, the temperature difference increases, and even if the pan 1 is made of non-metal having low thermal conductivity, the bottom 1a side of the pan 1 is thinner than the side 1b side as described above. Since the temperature distribution as described above is somewhat reflected as heating unevenness at the time of rice cooking, the temperature unevenness is suppressed to a level where there is no problem by making a difference in the thickness of the bottom heating elements 4a and 4b2. Specifically, the bottom heating element 4b has a smaller radial width and a smaller temperature distribution than the bottom heating element 4a, so the central part in the radial direction is thin and the peripheral part is thick. On the other hand, since the bottom heating element 4a has a large width dimension in the radial direction and a large temperature distribution difference, the heating element 4a at the central part where the temperature is high is eliminated, or the ratio of the thickness of the central part to the thickness of the inner and outer peripheral parts. Is made smaller than in the case of the bottom heating element 4b. This improved the uneven heating during cooking.

  The lid 3 is formed hollow by a front plate 21 and a back plate 22 made of resin such as PET, and a metal heat radiating plate 23 is fitted in a central area corresponding to the inner lid 7 of the back plate 22. A lid heater 24 is provided on the upper surface of the heat radiating plate 23, and the heat radiation from above through the heat radiating plate 23 contributes particularly to uniform heat retention of the rice. A sealing member 25 that is pressed from above is sandwiched between the outer cover of the inner lid 7 at the fitting portion between the back plate 22 and the heat radiating plate 23, and a steam chamber 26 that leads to the inside of the pan 1 through a steam hole (not shown) of the inner lid 7. A steam discharge port 28 is formed in the central portion of the lid 3 to separate the steam from the steam chamber 26 through the check valve 27 and discharge the steam to the outside. It is provided so that it can be attached and detached using elasticity. Corresponding to the high power heating from the bottom heating sources 6a and 6b, the heating from the side heating source 6c, etc., the resin part of the interior case 2a has a high heat resistance temperature of about 250 ° C. Adhesion with silicon-based adhesives has also been achieved without problems. On the other hand, the outer case 2b and the shoulder member 2c are made of resin such as PET having a heat-resistant temperature of about 150 ° as usual. Moreover, the recessed part 13 for facilitating the clue to the flange 1c between the flange 1c of the pan 1 is formed in the right and left two places of the shoulder member 2c. A handle 14 is provided on the upper portion of the metal body 2e so as to reach the shoulder member 12c.

  In the example shown in FIG. 2, the side heating source 4c has one side heating element 4c, whereas the heating coil 5c is divided into upper and lower heating coils 5c1 and 5c2. Thereby, each of the upper and lower heating coils 5c1 and 5c2 can be individually energized to vary the amount of heat generated between the upper part and the lower part of the side heating element 4c. Therefore, the side heating elements 4c are divided and arranged in a plurality of parts, or the heating values can be partially changed without changing the thickness or the silver content. The calorific value can be adjusted between smaller areas. As a result, the heating conditions on the side portion 1b are changed according to the difference in the total number detected due to the difference in the temperature rise rate, etc., or the temperature decreases at the upper part of the side portion 1b where the total number is small and there is no rice during the heat insulation. The large temperature difference between the lower portion where the rice is present and the tendency of dew condensation can be dealt with by controlling the amount of heat generated by the side heating element 4c so that the relationship of the upper portion> the lower portion.

  In the example shown in FIG. 3, a dedicated side heating coil 5c is opposed to the upper portion of one side heating element 4c, and a bypass portion (non-coil portion) 5b1 is provided from the rising region heating coil 5b to the lower portion. The side heating source 6c is configured by facing the extended heating coil 5b2 extended through the side heating source 5c. As a result, the extended heating coil 5b2 is heated at a high output in common with the bottom heating coil 5b, while the side heating coil 5c can be individually energized and controlled by the individual heating control number of the side heating coil 5c. The amount of heat generated can be made different between the upper and lower sides of the side heating element 4c without increasing the value. As a result, when cooking a small number of rice, the lower side heating element 4c lowers the calorific value at the top while increasing the calorific value by high output heating with the extended heating coil 5b2 of the bottom heating coil 5b, and ideal rice cooking Will be able to.

  In the example shown in FIG. 4, the side portion 1 b side of the pan 1 is connected to the side portion lower half region 1 b 1 connected to the rising region 1 a 2 on the outer periphery of the bottom portion 1 a side of the pan 1, and the side connected to it thicker than that. Each of which is provided with a heating source 4b. In particular, the side heating elements 4b are provided continuously, and the side heating coils 5c are opposed to almost the entire area. Thereby, the pan 1 has a rising area 1a2 on the outer periphery on the bottom part 1a side, on the side part side on the side part 1b side, and the thicknesses of the lower half areas 1b1, 1b2 are the bottom side rising area 1a2 <the side part side lower half area 1b2 <side part Satisfying the relationship of 1b1 in the side upper half region and gradually increasing the heat retaining properties from the bottom 1a side to the side 1b side, and the heating element 4c in both the side side lower half region 1b2 and the side side upper half region 1b1 And the temperature difference between the heating elements 4c from the bottom 1a side to the side 1b side is eliminated or reduced so that the temperature can be raised more easily and more evenly. You can cook rice and keep warm even more deliciously.

  Here, in the side heating source 6c of the pan 1, the heat generation amount of one side heating element 4c on the side 1b side is set higher in the side side lower half 1b2 than in the side side upper half 1b1. FIGS. 5 to 8 show examples in which the temperature increase difference and the temperature difference that increase between the upper and lower inner surfaces with the thickness change portion of the step portion D as the boundary are made smaller.

  In the example shown in FIG. 5, the lower half of the side heating element 4c is thicker than the upper half, or the silver content is increased, so that the equivalent alternating magnetic field intensity from one side heating coil 5c can be used. I am doing so. On the other hand, in the example shown in FIG. 6, the side heating coil 5c is divided into the side upper heating coil 5c1 and the side lower heating coil 5c2 so that they can be individually controlled to deal with the total number and prevent condensation during heat insulation. Convenient to respond to.

  In the example shown in FIG. 7, the amount of silver in the side heating element 4c is made equal in the vertical direction, the upper half of the side heating coil 5c facing this is wound once, the lower half is double wound, The number of turns is changed so that the amount of heat generated in the lower half is higher than that in the upper half of the side heating element 4c. On the other hand, in the example shown in FIG. 8, the side heating coil 5c is divided into a single winding side upper heating coil 5c1 and a double winding side lower heating coil 5c2, and can be individually controlled. Convenient for handling and preventing condensation during heat insulation.

  Finally, the heating element 4 is provided on the outer surface of the pan 1 in any case, but it may be provided on the inner surface or embedded.

  The present invention is practically used in an electric rice cooker that employs a non-metallic pan, and has a structure with a non-thickness that makes use of the heat storage and heat retention of the pan, while cooking unevenness and heat-retaining unevenness due to a difference in heat conduction due to non-thickness You can cook more delicious rice and keep warm without seeing the occurrence of dew condensation.

It is sectional drawing of the half part which shows the 1st example of the electric rice cooker which concerns on embodiment of this invention. It is sectional drawing of the half part which shows the 2nd example of the electric rice cooker which concerns on embodiment of this invention. It is sectional drawing of the half part which shows the 3rd example of the electric rice cooker which concerns on embodiment of this invention. It is sectional drawing of the half part which shows the 4th example of the electric rice cooker which concerns on embodiment of this invention. It is sectional drawing of the half part which shows the 5th example of the electric rice cooker which concerns on embodiment of this invention. It is sectional drawing of the half part which shows the 6th example of the electric rice cooker which concerns on embodiment of this invention. It is sectional drawing of the half part which shows the 7th example of the electric rice cooker which concerns on embodiment of this invention. It is sectional drawing of the half part which shows the 8th example of the electric rice cooker which concerns on embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pan 1a Bottom part 1a1 Bottom center area 1a2 Bottom rise area 1c Side part 2 Main body 2a Interior case 2b Exterior case 2c Shoulder member 2d Connection part 3 Lid body 4 Heating element 4a, 4b Bottom heating element 4c Side heating element 5 side Side coil 5a, 5b Bottom heating coil 5c Side heating coil 5c1 Side upper heating coil 5c2 Side lower heating coil 6 Heating sources 6a, 6b Bottom heating source 6c Side heating source 24 Lid heater

Claims (5)

A heating element provided in a non-metallic pan, and a heating coil provided on the main body side that accommodates the pan to inductively heat the heating element by an alternating magnetic field, and a heating source comprising: In the electric rice cooker that cooks rice and heat,
An electric rice cooker characterized in that at least the heating element of the heating source is distributed and provided on a bottom side and a side side where the thicknesses of the pans are different.   2. The electric rice cooker according to claim 1, wherein the side heating element is provided below the top of the inner side surface of the pan.   The side part heating element is provided below a connecting part between the shoulder member connecting the upper end of the exterior case of the main body and the upper end of the interior case, and the interior case. The electric rice cooker as described in a term.   The side part side has a lower half side part connected to the rising area of the outer periphery of the bottom part side of the pan thicker than that, and an upper half part side part connected to the side part thicker than that, both of which are heating sources. The electric rice cooker of any one of Claims 1-3 characterized by the above-mentioned.   5. The electric rice cooker according to claim 4, wherein the side heating element is opposed to a partially different heating coil so that the heating value is partially different.

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