JP5076369B2 - Electric rice cooker - Google Patents

Description

  In the present invention, a heating coil is arranged between at least the bottoms of the inner and outer cases of the main body, and a heating element is provided in a portion facing the heating coil of the pan housed in the main body, and this heating element is induced by an alternating magnetic field from the heating coil. The present invention relates to an electric rice cooker that cooks rice by generating heat.

It is known that cooking can be performed by providing a heating element that generates heat by electromagnetic induction in a clay pot (see, for example, Patent Documents 1 and 2). A rice cooker that cooks rice with a simple heating source is already known (see, for example, Patent Document 3). Even if there is a difference between the outer surface and the inner and outer surfaces, the clay pots described in Patent Documents 1 and 2 are provided with a heat generation layer at the bottom, heated by electromagnetic induction from an electromagnetic induction cooker, and heated from the bottom for cooking. I am doing so. The thing of patent document 3 provides the magnetic heating element in the outer surface of the bottom part of a clay pot, and it is made to heat-induced by magnetic coupling with the alternating magnetic field from a heating coil, and is made to cook rice.
JP 2005-298161 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.

  Based on this point of view, the present inventors have conducted research on practical use of an electric rice cooker using a non-metallic thick pan that is easy to dissipate heat, such as a clay pot. Although the heating element of Fig. 1 has good heating efficiency, it is difficult to heat uniformly, and the heating element on the outer surface of the clay pot has high power heating from the bottom because the thermal conductivity of the clay pot is 1/200 that of aluminum. It has been found that when the output is increased by that amount, local overheating on the pan side and abnormal heating of the heating coil itself due to this overheating are caused.

  An object of the present invention is to provide an electric rice cooker that can be cooked satisfactorily by heating it efficiently and safely with a heating element provided on its outer surface even if it is a non-metallic pan.

To achieve the above object, an electric rice cooker of the present invention, heat generation by arranging a heating coil between at least the bottom of the body of the interior and exterior case, the portion facing the heating coil of the soil pot accommodated in the main body the body is provided, interior origination heat body in the alternating magnetic field is induced heating by electric cooker that performs cooking from the heating coil, the soil pot legs of the outer periphery which is provided to absorb the error in the height of its molding supported on the bottom of the case to suppress the variation of the distance between the heating element and the outer case, the inner portion which supports the heating element and the directly facing only One pot interior case, the heat-resistant plate of magnetically permeable, interior packaging case Is arranged so as to be sandwiched between the heating coil and an air gap is formed between the heat- resistant plate and the pan so as to reduce the heat dissipated from the heating element .

Nabegaimen In such a configuration, the portion facing the heating element of the soil pot in the body of the interior casing provided heat plate, but this heat plate a heating coil provided at least between the bottom of the interior and exterior case by the permeability It does not impair the effect of inducing heat generation by applying an alternating magnetic field to the heating element. Moreover, pairs Shi soil pot less likely to heat conduction to the heat generation temperature is high heating element pot outer surface, the heating element may be a heat radiation rate is high relation to the interior case side, of the interior casing and the pan thermally allowed Kagora to radiate from the heating element so take the heat of cooking to the air gap formed between, to increase the heating efficiency of the cooking while suppressing the amount of heat generated to the extent there is no local heating pot side, the soil pot The combination with the thick and easy-to-heat characteristics makes it possible to achieve good rice cooking that meets the purpose. Furthermore, the heat plate without such that Thus deterioration or damage to the heat resistance, to heat from a heating element Nabegaimen not to have an influence on the interior casing and the heating coil of the body, let alone under the outer casing of the main body Heat can be avoided. In addition, non-metal pans include a heating element and a heating coil at the bottom of the pan by supporting it on the bottom of the interior case with the legs of the bottom, regarding the size and shape, especially the height dimensions that are difficult to stabilize. Stabilizes the distance from the inner case and the air gap width without the influence of pan molding size variation, and effectively uses the heat generated by the heating element to the inside of the pot using the air gap and the air gap from the heating element. And the thermal safety of the interior case side using heat-resistant plates can be ensured as designed.

In addition to the above case, if the heat-resistant plate has a hole in the center part that makes the temperature sensor contact the pan and protrudes from the area facing the heating element, the correlation with rice cooking through the hole in the center part The temperature of the center part of the highly reliable pan bottom can be detected by a temperature sensor, and the heat reflecting surface is made larger than the area facing the heating element so that the heat from the heating element cannot be completely reflected and the interior case side It is easy to prevent it from reaching.

In addition to the above case, the legs may be annular.

  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, the pot is less likely to heat conduction in soil pot whereas fever temperature heating element is high Nabegaimen, there in relation radiator proportion to the interior case side increases from the heating element However, the air gap formed between the interior case and the pan makes the heat dissipated from the heating element reflected on the pan side, which can be used to heat the cooked rice and increase the heating efficiency. Good rice can be cooked with a combination of the non-metallic pot and the thick heat-dissipating properties while keeping the amount of heat generated to a low level. Moreover, it can prevent that the heat | fever from the heat generating body of a pan outer surface reaches | attains under the interior case of a main body, a heating coil , and an exterior case by the said heat reflection, and a main body and the safety | security of use are impaired. In addition, non-metal pans include a heating element and a heating coil at the bottom of the pan by supporting it on the bottom of the interior case with the legs of the bottom, regarding the size and shape, especially the height dimensions that are difficult to stabilize. Stabilizes the distance from the inner case and the air gap width without the influence of pan molding size variation, and effectively uses the heat generated by the heating element to the inside of the pot using the air gap and the air gap from the heating element. And the thermal safety of the interior case side using heat-resistant plates can be ensured as designed.

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

  As shown in FIG. 1 and FIG. 2, the electric rice cooker according to the present embodiment is mainly a non-metallic pot 1 such as a clay pot, a main body 2 that can be attached and detached, and a main body 2 and a pan 1. And a lid heating source 4 for heating from the bottom of the pan 1, a side heating source 5 for heating from the side of the pan 1, and a lid heating source 6 for heating from the lid 3. It has a basic configuration. The main body 2 is provided with a heating coil 4a of the bottom heating source 4 between the inner and outer cases 11 and 12, and a heating element 4b that is induction-heated by an alternating magnetic field from the heating coil 4a is provided on the bottom outer surface of the pan 1 opposite to the heating coil 4a. It is. The side heating source 5 is a heater 5a wound around the outer periphery of a metal body frame 11a sandwiched between a resin lower frame 11b and an upper frame 11c in the interior case 11. However, the side heating source 5 can also be a combination of a heating coil and a heating element (not shown). The lid heating source 6 is a heater 6a wired and attached to the upper surface of a metal heat radiating plate 3c fitted to a resin lower plate 3b combined with a resin upper plate 3a of the lid 3. The heat radiating plate 3c has a size corresponding to the opening of the pan 1, and heats the rice in the pan 1 from above the metal inner lid 7 that closes the opening of the pan 1, and mainly heats the side. In cooperation with 5, keep warm while preventing condensation due to temperature difference. The bottom heating source 4 can be used in combination with the heat insulation of the rice. In particular, the bottom heating source 4 is divided into a central part of the bottom of the pan 1 and an outer peripheral part that rises, for example, in the shape of a round, to the bottom part of the pan. The heating coil 4a2 and the heating element 4b2 are separated. However, the heating coils 4a1 and 4a2 are configured to perform the same energization control as a configuration in which one wire is wound in two places. However, the present invention is not limited to this, and individual energization control can be performed by configuring individual lines.

  As shown in FIG. 1, a power source / drive substrate 111 for driving the bottom heating source 4, the side heat source 5, and the lid heating source 6, and a control for performing rice cooking and cooking in a set mode through the power source / drive substrate 111. The substrate 112 is arranged in a large space formed between the front portions of the inner and outer cases 11 and 12 of the main body 2 to cool a heat generating element such as an IGBT that cooperates with the heat sink 13a by the fan 13. On the upper surface of the wide front part of the main body 2, there is provided an operation panel 14 for setting various modes, starting rice cooking and cooking, selecting and stopping heat insulation, and an operation board 18 on the inside thereof. It corresponds to various operations on the operation panel 14 and can display the operation state and the operation state. A take-up reel 115 for the power connection cord is accommodated between the rear portions of the main body 2 as a slightly larger space than between the side portions. The lower frame 11b and the upper frame 11c of the interior case 11 of the main body 2 are made of resin so that the lower frame 11b satisfies the magnetic permeability so as not to disturb the electromagnetic action on the heating elements 4b1, 4b2 by the heating coils 4a1, 4a2. Yes. The outer case 12 of the main body 2 is connected to the upper end of the peripheral wall of the resin bottom member 12a by forcibly fitting the lower end edge winding portion of the metal barrel portion 12b, and the upper end of the barrel portion 12b and the upper frame 11c of the interior case 11 are connected. The upper end is connected by a shoulder member 12c made of synthetic resin. The heating coils 4a1, 4a2 are placed on and supported by a resin coil base 15, and ferrite 16 extending radially below the coil base 15 is supported by a resin support base 17, and the heating coils 4a1, 4a2 are provided. The magnetic field generated by is strengthened and stabilized.

  As shown in FIG. 1, the lid 3 is pivotally supported by the rear bearing portion 2d of the main body 2 so that it can be opened and closed by a shaft 21, and is urged in the opening direction by a spring 22, and the sliding contact between the spring 22 and the rear bearing portion 2d. The lid 3 opens slowly due to resistance caused by the above. The front portion of the lid 3 is locked at a closed position by a lock lever 23 provided on the side of the main body 2 so as to be pivotally supported by the shaft 124, so that the lock is released by the unlocking operation of the lock lever 23 and is opened by the spring 22. I have to. In such a closed state of the lid 3, the seal packing 24 sandwiched between the lower plate 3 b and the heat radiating plate 3 c of the lid 3 is pressed against the outer peripheral frame 7 a of the inner lid 7 as shown in FIGS. 1 and 2. In this state, the inner lid 7 is pressed against the horizontal lip of the pan 1 from above with a seal packing 25 provided between the outer peripheral frame 7a, the pan 1 is closed, and rice is cooked or kept warm. Become. In such a closed state, the inner lid 7 has holes (not shown) in the high and low positions, and escapes steam during cooking, or causes the steam that escapes from the inner lid 7 to accompany the escaped steam. It can be returned to the pot 1. Further, a steam pipe 27 is inserted into the hole 26 provided in the center of the lid 3 from below and is held by a seal packing 28 on the inner periphery of the hole 26 so that it can be attached and detached for disassembly and cleaning. The steam pipe 27 has a steam passage 29 having a ball-like check valve 29a, and discharges the steam that has flowed out of the inner lid 7 to the outside of the lid 3 only when the valve pressure of the check valve 29a is exceeded. While the gas-liquid separated rice bowl is returned to the inner lid 7, it is returned to the pot 1.

  Here, the non-metallic pan 1 may be mainly made by firing porcelain clay, but also includes ceramics and various known ones can be adopted. The heating elements 4b1 and 4b2 of the bottom heating source 4 are conductive layers that generate heat by generating eddy currents by alternating magnetic fields from the heating coils 4a1 and 4a2, and are made of a silver paste of about 10 to several tens μm provided on the outer surface of the pan 1. An application layer by printing or the like, a laminated layer of silver foil, or a silver vapor deposition layer may be used. However, the conductive material and the layer formation method can be freely selected. The heater 5a of the side heating source 5 is equipped by being sandwiched between the outer surface of the body frame 11a as a heat radiating plate such as aluminum, a steel plate, and stainless steel facing the side of the pan 1 in the interior case 11 and the presser plate 5c. However, although it is mainly used for heat retention, the lower part of the heater 5a is particularly suitable for cooking rice. For these reasons, the uppermost one of the quadruple heaters 5a has an energization capacity equivalent to 20W, the lower one has an energization capacity equivalent to 40W, so that both are equivalent to 60W, and the bottom two are 60W. The current-carrying capacity is considerable. The difference in energization capacity can be easily obtained by the difference in duty ratio of energization or any way. By utilizing such a difference in energization capacity, fine heating control according to various conditions such as the total number at the time of rice cooking, condensation at the time of heat retention, whitening, and browning due to drying can be performed.

  Various electric rice cooking modes, cooking modes, and heat retention modes can be executed as described above. However, in the present embodiment, in particular, the heat of the heating elements 4b1, 4b2 provided on the outer surface of the pan 1 is not transferred to the pan 1 side efficiently, so that the heat is transferred to the interior case 11 side and the heating coils 4a1, 4a2. As shown by the arrow 20 in FIG. 3, the rate of heat dissipation increases, and rice cooking cannot be carried out successfully, or if the heating temperature at the time of cooking is increased to ensure the rice cooking temperature, the local overheating on the pan 1 side or this local Deterioration and melting of the lower frame 11b of the interior case 11 due to heat radiation (arrow 20), particularly the heating element 4b1, which becomes an overheated part, cause abnormal heat generation of the heating coil 4a1, etc., and the rice cooker and use safety are impaired. In order to cope with this, a permeable heat-resistant plate 31 is disposed on the pan 1 of the lower frame 11b in the interior case 11, particularly in a portion facing the heating element 4b1 having a large radial width and a large total heat generation amount. , And so as to reflect as indicated by the arrows 20a the heat from the heating element 4b1 in FIG. However, a heat-resistant plate 31 may be provided in a portion facing the heating element 4b2 to perform the same function.

  Thus, the magnetically permeable heat-resistant plate 31 provided in the main body 2 at the facing portion of the inner case 11 facing the heating element 4b1 provided on the outer surface of the pan 1 is at least the bottom of the inner and outer cases 11 and 12 by the magnetic permeability. It does not impair the effect of inducing heat generation by applying an alternating magnetic field to the heating element 4b1 on the outer surface of the pan 1 facing the heating coil 4a1 provided therebetween. Moreover, this heat-resistant heat-resistant plate 31 is made of a non-metallic material such as a clay pot, which has a low thermal conductivity, whereas the heating element 4b1 on the outer surface of the pot 1 generates heat at a high temperature necessary for good rice cooking. Even if the ratio of heat radiation shown by the arrow 20 in FIG. 3 to the outer surface from the heating element 4b1 to the interior case 11 side is high, the heat radiation 20 is placed on the surface of the heat-resistant plate 31 on the pan 1 side. As shown by the arrow 20a shown in FIG. 3, the pot 1 is secondarily heated and used again for heating the cooked rice to increase the heating efficiency. As a result, good cooking with uniform and sufficient heating corresponding to the object of the present invention is realized from the combination of the non-metallic pot 1 with the thick and easy-to-heat characteristics. Furthermore, the heat-resistant plate 31 is not deteriorated or damaged due to its heat resistance, and heat from the heating element 4b1 on the outer surface of the pan 1 does not reach the interior case 11, particularly the lower frame 11b and the heating coil 4a1 of the main body 2. In addition, it is possible to avoid heat from reaching the outer case 12 of the main body 2.

  Here, the heat-resistant plate 31 is preferably made of a non-metal or non-resin material in terms of magnetic permeability and heat resistance, and a ceramic type is suitable for forming the mold, heat resistance, and reflecting surface. If the surface facing the heating element 4b1 is the white reflecting surface 31a, the heat absorption is avoided and the reflectance can be increased. When the white of the reflecting surface 31a is ceramic, it is easily realized by the firing temperature, and a glossy specular reflecting surface 31a can be obtained at the same time. Also, if the firing temperature to obtain a white color becomes a problem in other aspects such as durability, even if firing other than white, a white glossy material is pasted or a white glossy surface is painted. Also good. The surface roughness suitable for such a reflective surface 31a may be about 3 to 5 μm, for example. Moreover, when making a ceramic transparent, the white reflective surface 31a may be given to the surface of the heat-resistant plate 31, or may be given to a back surface, and both can be selected. However, if the back surface 31b of the heat-resistant plate 31, that is, the surface facing the interior case 11 is a rough surface and is adhered to the interior case 11, the adhesion is improved. The adhesive is silicon-based and is water-curable and easy to handle. Thus, the rough surface of the heat-resistant plate 31 is preferably about 30 μm on the back surface and about 10 to 6 times the surface roughness of the back surface 31b with respect to the reflective surface 31a on the front surface. However, it is not limited to these. A recess 30 that is slightly smaller than the heat-resistant plate 31 is provided in the region of the lower frame portion 11b of the interior case 11 where the heat-resistant plate 31 is bonded. The contact area is widened to the extent of the recess 30 while keeping the heat-resistant plate 31 pressed against the bottom of the recess 30 and pushing the heat-resisting plate 31 around, while keeping it close to the bottom of the recess 30. Finally, the adhesive does not protrude from the recess 30, and therefore, the back surface of the heat-resistant plate 31 can be bonded under a height regulation that is in close contact with the upper surface of the lower frame 11 b, and the distance from the pan 1 Easy to keep constant.

  The heat-resistant plate 31 reflects heat from the heating element 4b1 and the like toward the pan 1, and it must be avoided to contact each other. Therefore, it is essential to provide the air gap 32 between the pan 1 and the heating element 4b1 and the heat-resistant plate 31. In particular, it is desirable that the air gap 32 is a closed space and is opened at least around so as not to generate heat. In the present embodiment, the air gap 32 is an annular formed on the outer periphery of the bottom of the pan 1. 3 at the height around which the leg portion 1d is supported by the elastic support base 33 made of silicon rubber or the like shown in FIGS. 2 and 2 provided at about three places on the circumference of the bottom outer periphery of the lower frame 11b. It is secured only by contact. However, the air gap 32 can also be ensured by receiving and suspending the flange 1c of the opening of the pan 1 shown in FIGS. The placement and support on the elastic support base 33 by the leg 1d of the pan 1 also exhibits the effect of elastic support of the pan 1 and rotation prevention. On the other hand, as shown in FIGS. 1 and 2, the air gap 32 is formed in the entire area between the interior case 11 and the pan 1 while preventing the heat effect from the pan 1 side to the interior case 11 side. The heat is spread between the interior case 11 and the pan 1, and it becomes easy to promote heating efficiency and uniform heating in cooperation with the heating of the pan 1 and the cooked rice, which are made of non-metal thick and low heat conductivity. In particular, the heat-resistant plate 31 provided in the interior case 11 of the main body 2 is easy to make use of the heat reflected on the pan side.

  Furthermore, the heat-resistant plate 31 has a hole 35 in the central portion for bringing the temperature sensor 34 into contact with the pan 1 and is larger than the outer diameter of the opposing heating element 4b1. Thereby, the temperature of the center part of the bottom part of the pan 1 having a high correlation with rice cooking can be detected by the temperature sensor 34 through the hole 35 in the center part. For this purpose, as shown in FIGS. 1 and 2, the temperature sensor 34 is provided in the center of the coil base 15 and is urged upward by a spring, penetrates the lower frame 11b and the heat-resistant plate 31, and always protrudes thereon. The temperature of the pan 1 can be monitored by being in pressure contact with the bottom of the pan 1 placed on the elastic support base 33.

  The pan 1 has a lower half 1b that is thinner than the facing portion 1e facing the side heating source 5. Thus, the pan 1 is housed so as to be detachable from the main body 2, and the cooking of rice and rice is performed by heating from the bottom heating source 4, the side heating source 5 and the lid heating source 6. The lower half 1b of 1 is thinner than the facing part 1e facing the side heating source 5 and has a smaller heat capacity, so that heat from the heating elements 4b1, 4b2 important for rice cooking is used for primary heating by the direct heat conduction. The secondary heating by the heat reflected from the heat-resistant plate 31 is obtained, and the heating efficiency is further improved, and sufficient cooking rice heating is realized while suppressing to a relatively low energization capacity, and good rice cooking can be performed. In addition, the pot 1 is opposed to the side heating source 5 and the portion 1e is thicker than the lower half 1b and has a higher heat storage capacity. It becomes easy to keep the temperature of the rice uniformly based on the characteristics and the heat assistance based on the heating from the side heating source 5 and the heating from the lid heating source 6.

  Moreover, although the pan 1 makes the lower half part 1b facing the bottom heating source 4 thinner than the facing part 1e facing the side heating source 5, the thickness of the facing part 1e facing the side heating source 5 is larger. The drop-resistant strength is not impaired by the cooperation. In particular, the required strength when falling in an upright posture is satisfied. And the high output heating from the bottom heating source 4 makes the rice cooking heat easier to live by the amount that the lower half 1b that is opposite to the bottom heating source 4 is thin and the heat storage capacity is small, and thick side heating The heat transfer to the facing portion 1e with the source 5 is also promoted. Therefore, the rice in the uniform heating accompanied by the active convection in the water in the pan 1 and the whole area of the rice is realized. Here, it can be said that the side of the pan 1 is thick at the top and thin at the bottom including the bottom rounded portion of the pan 1, but the thin region extends to the side region where the drop resistance strength of the pan 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 pan 1 further increases. The thick portion and the thin portion of the pan 1 are continuous by forming a rounded step portion D on the outer surface of the pan 1, and a relatively rapid change in thickness 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. For the pan 1 that has been sealed, the thickness of the lower half 1b, which is the facing portion to the bottom heating source 4, is about 3 to 4 mm, and the thickness of the facing portion 1e to the side heating source 5 is about 7 to 8 mm. Sufficient drop-proof strength was obtained, and rice cooked by uniform heating and uniform heat retention were realized. From such a dimensional relationship, the difference in thickness between the thick portion and the thin portion of the pan 1 can be approximately doubled. In addition, since there is no heating source between the opposing part with the trunk | drum frame 11a which is a heat sink of the heater 5a of the pan 1, and the part which has the heat generating body 4b2 which opposes the heating coil 4a2, the thickness of the pan 1 is so small. It is advantageous for uniform heating during cooking, and is preferably about 3 mm. In some cases, it is thinner than the thickness set in the lower half 1b of the pan 1 on condition that the drop-proof strength is satisfied. May be.

  Further, according to the experiments of the present inventors, the heat generation amount of the heating elements 4b1, 4b2 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. The temperature difference becomes larger as the thickness of the pan 1 increases. Even if the pan 1 is made of a non-metal having low thermal conductivity, the lower half 1b of the pan 1 is opposed to the side heating source 5 as described above. In the configuration where the thickness is made thinner, the temperature distribution as described above is somewhat reflected as the heating unevenness at the time of rice cooking, so that the temperature unevenness is suppressed to a level that does not cause any problem by making a difference in the thickness of the heating elements 4b1 and 4b2. ing. Specifically, the heating element 4b2 has a smaller width in the radial direction and a smaller temperature distribution than the heating element 4b1, so that the central part in the radial direction is thin and the peripheral part is thick. On the other hand, since the heating element 4b1 has a large width dimension in the radial direction and a large temperature distribution difference, the heating element 4b1 at the central part where the temperature becomes high is eliminated, or the ratio of the thickness of the central part to the thickness of the peripheral part is The heating element 4b2 is made smaller than the case. This improved the uneven heating during cooking. This is because if there is a partial thickness difference between the heating elements 4b1 and 4b2, the amount of current is concentrated and the amount of heat generation is greater than that of the thin-walled portion. It seems to be due to this. Such a partial thickness difference can be easily realized by partially changing the number of times of application, and a portion of thickness 0 where no heating element is provided can be realized by omitting application of the heating element. Here, if two examples of L-2 (100 size) and K (150 size) are shown, favorable results were obtained as a dimensional relationship and a thickness relationship as shown in FIG.

  In response to the high power heating from the bottom heating source 4 as described above, the resin portion of the interior case 11 is conventionally formed of PET together with the resin portion of the exterior case 12, but the heat resistant temperature is as low as about 150 ° C. Since there is a concern about thermal influence, in this embodiment, the upper frame 11c and the lower frame 11b are made of PPS having a high heat resistant temperature of about 250 ° C., and adhesion of the heat resistant plate 31 to the silicon-based adhesive can be achieved without any problem. ing. On the other hand, the bottom member 12a and the shoulder member 12c of the outer case 12 are made of resin such as PET as usual. In addition, as shown in FIG. 2, recesses 41 for facilitating clues to the flange 1c are formed between the shoulder member 12c and the flange 1c of the pan 1, as shown in FIG. A handle 118 that reaches the shoulder member 12c and is supported is provided on the upper portion of the body 12b.

  INDUSTRIAL APPLICABILITY The present invention is practically used in an electric rice cooker that employs a non-metallic pan, and realizes safe and highly efficient rice cooking with a heating element on the outer surface of the pan that is inductively heated 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 which shows the relationship between the heat generating body provided in the bottom outer surface of the pan of the electric rice cooker of FIG. 1, and the heat-resistant plate provided in the part of the interior case facing this. It is a top view of the lower frame which shows the part which accommodates and supports the pot of the interior case in the main body of the electric rice cooker of FIG. It is explanatory drawing which shows the difference in the relationship of the size of the heat generating body in two examples provided in the center part of the bottom part of the pot of the electric rice cooker of FIG. 1, and a peripheral part, and the percent of silver per unit area. .

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pan 2 Main body 3 Cover body 4 Bottom part heating source 4a1, 4a2 Heating coil 4b1, 4b2 Heat generating body 5 Side part heating source 5a Heater 11 Interior case 12 Exterior case 31 Heat-resistant plate 31a Reflective surface 31b Back surface 32 Air gap 34 Temperature sensor 35 Hole

Claims (3)

By disposing heating coil between at least the bottom of the body of the interior and exterior case, the heating element portion facing the heating coil of the soil pot accommodated in the main body is provided, by induction heating by the alternating magnetic field from the heating coil origination thermal body In an electric rice cooker that cooks rice,
Soil pot suppress variation in the distance between the errors of the molding on the height leg of the outer periphery which is provided to absorb and support the bottom of the interior casing heating element and the outer casing, the heating element of the interior casing When directly opposed only One pot inside the portion supporting the heat plate magnetically permeable, arranged to be positioned so as to sandwich between the heating coil interior case, the heating element between the heat plate and the pan An electric rice cooker characterized by forming an air gap that heats heat dissipated from the heat . By disposing heating coil between at least the bottom of the body of the interior and exterior case, the heating element portion facing the heating coil of the soil pot accommodated in the main body is provided, by induction heating by the alternating magnetic field from the heating coil origination thermal body In an electric rice cooker that cooks rice,
Soil pot suppress variation in the distance between the errors of the molding on the height leg of the outer periphery which is provided to absorb and support the bottom of the interior casing heating element and the outer casing, the heating element of the interior casing When directly opposed only One pot inside the portion supporting the heat plate magnetically permeable, arranged to be positioned so as to sandwich between the heating coil interior case, the heating element between the heat plate and the pan an air gap which Kagora the heat radiating form from,
Heat resistance plates, electric rice cookers, characterized in that the bore contacting the temperature sensor in a pot having in the central portion is sized to protrude from the opposite region of the heating element. By disposing heating coil between at least the bottom of the body of the interior and exterior case, the heating element portion facing the heating coil of the soil pot accommodated in the main body is provided, by induction heating by the alternating magnetic field from the heating coil origination thermal body In an electric rice cooker that cooks rice,
Soil pot suppress variation in the distance between the errors of the molding on the height leg of the outer periphery which is provided to absorb and support the bottom of the interior casing heating element and the outer casing, the heating element of the interior casing When directly opposed only One pot inside the portion supporting the heat plate magnetically permeable, arranged to be positioned so as to sandwich between the heating coil interior case, the heating element between the heat plate and the pan An electric rice cooker characterized in that an air gap is formed to dissipate heat dissipated from the heat and the legs are annular.

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