JP2008272263A - Nonmetallic pot for rice cooker and electric rice cooker using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a nonmetallic pot for rice cooker which is suited to the form of the pot and the simplification of an induction heating method and prevents uneven temperature rise and uneven heating due to a bottom riser. <P>SOLUTION: This nonmetallic pot includes a heating body 3 heating by electromagnetic induction and the bottom riser 5 for lifting the heating body 3 from a fixed installation surface 4, on the lower surface of the bottom 2; wherein the bottom riser 5 is formed continuously around the outer surface 6b of an approximately straight body part 6, and positioned on or outside the substantially extension line 7 from the inner face 6a of the body part 6. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a non-metallic pan for a rice cooker having a heating element that generates heat by electromagnetic induction on a bottom lower surface, and a hill that floats the heating element from a stationary surface, and an electric rice cooker using the same.

Various earthenware pans for electromagnetic induction heating cookers are known, and non-metal pans with a heating element that generates heat by electromagnetic induction and a discontinuous height in the circumferential direction that floats the heating element from the stationary surface are also known on the bottom surface. (For example, refer to Patent Document 1). In order to provide a plateau on the earthenware pan, as disclosed in Patent Document 1, it is generally set at a position close to the inside from the outer periphery of the lower surface of the bottom.
JP 2006-167157 A

  By the way, the present applicant has already developed and proposed an electric rice cooker using a clay pot, and has also put it into practical use. The form of the non-metallic pan for the rice cooker is substantially the same as the form of the metallic pan, and is different in that a plateau is provided to protect the heating element on the bottom bottom surface. In addition, similarly to the electric rice cooker using a metal pan, the electromagnetic induction coil is arranged in two places corresponding to the center of the bottom of the non-metal pan and the rising curved portion from the bottom of the body, A heating element is provided on the outer surface of the non-metallic pan corresponding to these. As a result, it has been successfully put into practical use, including ingenuity unique to non-metallic pans in terms of heating conditions, control conditions, and temperature detection conditions.

  On the other hand, while further development is being carried out for the realization of downsizing and small-capacity types, and the simplification of the form of non-metallic pans and induction heating methods, the present inventor protects the heating element by floating it from the stationary surface. Therefore, the volume locally increases compared to the wall thickness on both sides of the bottom of the non-metallic pan, and it is difficult to lower the temperature once the temperature rises. However, when it is cooked empty from the difference in temperature rise with the adjacent part, cracking is likely to occur, and the difference in temperature rise also causes uneven heating and hinders the delicious cooking of rice.

  The object of the present invention is to solve the above-mentioned problems, and is suitable for simplification of the form of the pan and the induction heating method, and further, a non-metallic pan for a rice cooker that does not have a temperature difference due to a high ground and uneven heating. It is in providing the electric rice cooker using it.

  In order to solve the problems as described above, the non-metallic pan for the rice cooker of the present invention includes, on the bottom bottom surface, a heating element that generates heat by electromagnetic induction, and a hill that floats the heating element from a stationary surface. In addition, it is characterized in that it is provided so as to be substantially continuous with the outer surface of the substantially cylindrical body and to be positioned on an extension line from the inner surface of the body or on the outside thereof.

  In such a configuration, the hill protrudes locally on the bottom bottom surface of the non-metallic pan in order to float and protect the heating element from the stationary surface, but it is located almost continuously on the outer surface of the roughly torso body. And because it is at least almost out of the heating area in the non-metallic pan by being located on the outside of the extension line from the inner surface of the body part or outside it, even when there is a certain temperature rise difference during cooking It is possible to prevent heating unevenness. In addition, a heating area corresponding to almost the entire storage area of the non-metallic pan can be realized simply by providing a heating element inside the hill on the bottom lower surface of the non-metallic pan so as to correspond to one heating coil. Increases heating efficiency and uniformity of heating in low non-metallic pans. Furthermore, the volume ratio in the cylindrical region including the trunk portion is increased.

  In the above, the thickness of the bottom portion with the hill as the boundary and the rising curved portion from the bottom portion of the trunk portion may be made substantially equal.

  According to such a configuration, in addition to the above, further care is provided by the rising curved portion from the bottom portion that is substantially continuous to the hill portion so as not to impair the shape of the body portion of the non-metallic pan for rice cookers. Enhance the stirrability of cooked rice, and make the outer surface along the R surface between the bottom and torso of the non-metallic pan without being thicker, almost the same as the thickness of the bottom, and the hill It is possible to reduce the volume of the temperature difference and to moderate the change in the thickness at the hill and reduce the temperature difference and uneven heating.

  In the above, the rising position of the rising curved portion may correspond to the minimum cooking water level or near the lower part thereof.

  In such a configuration, in addition to the above, in addition to ensuring the practical care and the stirring ability of the rice as a curved rising position that corresponds to or near the minimum cooking water level, It is possible to prevent the volume from increasing.

  In the above, the hill part may be characterized by being continuous all around.

  In such a configuration, in addition to the above, if the high plateau is discontinuous, the thickness change in the circumferential direction between the high plateau of the nonmetallic pan and the discontinuous portion thereof becomes extreme, during high-temperature heating. In particular, it can be prevented that cracking occurs when cooking empty, by the hills being continuous.

  The electric rice cooker of this invention accommodates and receives so that it can attach or detach this non-metallic pan with any one of said non-metallic pans for rice cookers, and the heating arrange | positioned between the bottom part of an inner and outer case An apparatus for cooking rice by heating a non-metallic pan heating element by means of an alternating magnetic field from the coil, and a lid body for opening and closing the apparatus body and the non-metallic pan and releasing steam during cooking to the outside in the closed state A plurality of heaters are arranged from the lower part of the body part of the interior case of the container to the flange part of the non-metallic pan from the lower part to the shoulder part facing the lower part, and a plurality of heaters are provided on the metal heat sink of the lid. The heater is arranged in the radial direction.

  In such a configuration, the entire electric rice cooker is downsized due to the reduction of dead space and the number of heating coils due to the high volume ratio of the non-metal pan for rice cookers, and the rice cooker is accompanied by temperature compensation at each part by a large number of heaters. It is possible to exhibit uniform heatability during time and heat retention, prevention of dew condensation due to temperature unevenness, care, rice agitation, and crack prevention.

  According to the non-metal pan for the rice cooker of the present invention, the hill is substantially continuous to the outer surface of the rough body, and is substantially above or outside the extension line from the inner surface of the body, from the heating area in the pan. In addition to preventing uneven heating due to temperature difference, heat conduction in a heating area that almost corresponds to the entire holding area of the pan by simply making the heating element inside the hill correspond to one heating coil. Heating efficiency and non-uniformity of non-metallic pans are improved, and rice can be cooked deliciously. Further, the volume ratio in the cylindrical region including the trunk portion is increased, and the bulkiness against the capacity can be reduced.

  In addition to the above, the non-metallic pan for rice cookers has a rising curved portion from the bottom that is almost continuous with the hill so that it does not impair the shape of the torso. The outer surface of the pan in the pan and the R-side between the barrels are made thicker, making the outer surface almost the same as the thickness of the bottom, and the volume of the high plateau is suppressed. The change in the wall thickness at the border can be moderated to reduce changes in temperature rise and uneven heating, preventing cracking of non-metallic pans and making rice more delicious.

  In addition to the above, the curved rising position that corresponds to or near the minimum cooking water level ensures practical care and rice agitation, and the volume of the hill is increased. It is possible to prevent the presence of the hill from causing cracks and uneven heating.

  In addition to the above, if the high plateau is discontinuous, the thickness change in the circumferential direction between the high plateau of the non-metallic pan and its discontinuity becomes extreme, when heating at high temperature, especially when cooking empty It can prevent that it becomes a cause of a crack by the hill part continuing, and can improve durability.

  According to the electric rice cooker of the present invention, the entire electric rice cooker is downsized from the reduction of dead space and the number of heating coils due to the high volume ratio of the non-metallic pan, and temperature compensation at each part by a large number of heaters. Along with this, uniform heating at the time of rice cooking or heat retention, prevention of condensation due to temperature unevenness, care, rice agitation and cracking prevention can be exhibited, and it is particularly suitable for a small-capacity electric rice cooker.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a non-metal pan for a rice cooker according to the present invention and an electric rice cooker using the same will be described in detail with reference to FIGS. 1 to 10 to provide an understanding of the present invention.

  The non-metallic pan 1 for the rice cooker of the example shown in FIG. 1 of the present embodiment is one example of the present invention, has a dimensional relationship as shown, and has a small-capacity cooking pan with 3 or less cooking. However, the present invention is not limited to this. Basically, the lower surface of the bottom portion 2 includes a heating element 3 that generates heat by electromagnetic induction and a hill 5 that floats the heating element 3 from the stationary surface 4. The hill 5 is substantially continuous with the outer surface of the roughly body 6, and from the inner surface 6 a of the body 6, as shown in FIG. It is characterized in that it is provided on the outer side. In the example of FIG. 3, the hill 5 is located on the center line 7a of the thickness of the trunk | drum 6 following this. Here, the non-metallic pan 1 may be a so-called clay pan obtained by firing ceramic clay, but various known ones including ceramics can be adopted. The heating element 3 can be formed by adopting, for example, silver and transferring a silver foil from a transfer paper, and may usually have a layer thickness of about 10 to several tens of μm. However, it may be a silver paste coating layer, a printing layer, or a silver deposition layer. Materials and installation methods can be freely selected.

  As described above, the present inventor locally protrudes from the lower surface of the bottom portion 2 of the non-metallic pan 1 to protect the heat generating body 3 by floating it from the stationary surface 4. The volume increases locally compared to the wall thickness of the wall, and once the temperature rises, it is difficult to lower the temperature, but the temperature rise is extremely delayed, and cracking is particularly likely to occur when cooking empty from the temperature rise difference with the adjacent part. Although it has been experienced, from the above features, the hill 5 is located substantially continuously on the outer surface 6b of the rough barrel 6, and almost from the inner surface 6a of the barrel 6 as in the example shown in FIG. Since it is located on the extension line 7 or on the outer side as shown in the example shown in FIG. 3, it is at least almost out of the heating area in the non-metallic pan 1, so even if there is a certain temperature difference, heating unevenness during cooking Can be prevented. Moreover, the heating element 3 is provided inside the hill 5 on the bottom lower surface of the non-metallic pan 1, and the entire non-metallic pan 1 is simply associated with one heating coil 11 in the electric rice cooker 10 shown in FIG. A heating area X substantially corresponding to the housing area X0, in other words, substantially corresponding to the inner diameter of the body 6 of the non-metallic pan 1 is realized, and the heating efficiency and heating equality in the non-metallic pan 1 having low thermal conductivity are realized. Increase the degree. Furthermore, the volume ratio in the cylindrical region X1 including the trunk portion 6 is increased.

  As a result, the hill 5 is substantially continuous with the outer surface 6b of the rough barrel portion 6 and is substantially out of the heating zone X on or outside the extended line 7 from the inner surface 6a of the barrel portion 6; In addition to preventing uneven heating due to the difference in temperature rise, the heating element 3 inside the hill 5 is made to correspond to one heating coil 11 and the like, so that the heating area X substantially corresponds to the entire accommodating area X0 of the nonmetallic pan 1. In addition, the heating efficiency and the heating uniformity in the non-metallic pan 1 having low thermal conductivity can be increased, and rice can be cooked deliciously. Moreover, the volume ratio in the cylindrical area X1 including the trunk | drum 6 increases, and the bulkiness with respect to a capacity | capacitance can be reduced.

  Further, the thicknesses of the bottom portion 2 with the hill 5 as a boundary and the rising curved portion 6c from the bottom portion 2 of the trunk portion 6 are made substantially equal. Thereby, by the rising curved part 6c from the bottom part 2 substantially continuous to the 5th part of the hill so as not to impair the shape of the body part 6 in the non-metallic pan 1, the maintainability and the stirring ability of the rice after cooking The outer surface 6b is not thickened with respect to the R surface 8 between the bottom portion 2 and the body portion 6 in the non-metallic pan 1 and increases the thickness of the bottom portion 2 and is approximately equal to the thickness of the bottom portion 2. The volume is also suppressed, and the change in the temperature difference and heating unevenness can be reduced by gradual change in the thickness at the 5th part of the hill. Therefore, the crack by the temperature increase difference of the nonmetallic pan 1 can be prevented, and the rice can be cooked more deliciously. Further, the rising position X2 of the rising curved portion 6c substantially corresponds to the minimum cooking water level shown as the minimum graduation line height in FIG. 6 or near the lower portion thereof as shown in FIG. As a result, the curved rising position X2 that substantially corresponds to or near the minimum cooking water level ensures practical care and rice agitation, and the volume of the 5th part of the hill is increased. Can be prevented. Therefore, it is possible to prevent the presence of the hill 5 from causing cracks and uneven heating. At the same time, the inferior indentation into the corner of the mold surface such as porcelain, which is likely to occur when the non-metal pan 1 is pressed to the mold surface such as porcelain, is also eliminated and the moldability is improved. In particular, when the rising position of the rising curved portion 6c is lower than the minimum cooking water level, there is an advantage that transfer of the minimum graduation line indicating the minimum cooking water level is facilitated and positional deviation is less likely to occur. Furthermore, the hill 5 part is continuous all around as shown in FIG. If 5 parts of the plateau is discontinuous, the thickness change in the circumferential direction between the plateau 5 part of the non-metallic pan 1 and the discontinuity thereof becomes extreme, causing cracks during high temperature heating, especially when cooking empty This can be prevented by continuously removing the thickness change in the circumferential direction by the five parts of the hill, and the durability is improved.

  The example shown in FIG. 1 will be further described. The thickness C of the bottom portion 2 is larger than the thickness B of the rising curved portion 6c of the trunk portion 6, and the bottom portion 2 is heated by providing the heating element 3. The wall thickness change with 5 parts of the hill is made smaller than the wall thickness change between the rising curved part 6c and the 5 parts of the hill, so that the temperature difference and heating unevenness are further eliminated, cracking is sufficiently prevented and uniform heating is improved. I can plan. Further, when the radius dimension R of the R surface 8 is set on the basis of these thicknesses B and C, it is preferable to set with a width of about R ≧ 2 · B or 2 · C to ensure formability. . As described above, B and C are not limited to the dimensions shown in FIG. Further, the thickness A of the upper portion of the body portion 6, for example, the rising curved portion 6c to the upper portion 6d is set to be lower than that, and accordingly, in the illustrated example, larger than the thickness B of the rising curved portion 6c. Increases heat storage and prevents shortage of heatability from the side during cooking and warming. As a result, the change in the thickness of the step portion X3 between the upper portion and the lower portion of the body portion 6 is moderated by the two R surfaces having different directions so that cracks due to stress concentration do not occur. Further, the upper part 6d of the body part 6 has a slight taper shape whose diameter increases toward the upper end opening 20, and is easily drawn out from the mold with the same thickness, and the hill 5 and the rising curved part 6c The slightly three-dimensional shape increases the impact resistance when dropped.

  Further, since the outer periphery of the heating element 3 is separated from the hill 5, it is possible to reduce the temperature rise difference from the hill 5 where the heating element 3 that generates heat at a high temperature is nearby and the temperature rise is delayed. In addition to or separately from this, reducing the heat generation amount of the heating element 3 toward the outer periphery is also effective in reducing the temperature rise difference between the part 5 on the hill and the heating element 3 located in the vicinity thereof. For this purpose, the layer thickness of the heating element 3 may be increased in proportion to the set heat generation amount. For example, as shown in FIG. 3, the transfer layer of the heating element 3 may be stacked depending on the degree of heat generation. Conversely, the outer periphery of the heating element 3 is exerted on the upper plateau 5 part as shown by the broken line in FIG. The temperature rise of 5 parts can be accelerated to reduce the temperature rise difference from the heating element 3 and the bottom 2. For this purpose, it is preferable that the amount of heat generated in the portion of the heating element 3 that reaches the upper part 5 is larger than the amount of heat generated in the other portions.

  Further, as in the example shown in FIGS. 4A to 4C, by gradually increasing the thickness of the bottom 2 toward the hill 5, the change in the temperature rise difference from the bottom 2 to the hill 5 is extremely gentle. It is easy to prevent cracking under bad conditions when cooking empty. It is more preferable to use it in combination with the other crack prevention measures described above. In each example shown in FIG. 4, the outer periphery of the heating element 3 is separated from the hill 5. In the example of FIG. 4A, the thickness of the bottom 2 is gradually increased as curved surfaces having large radii of curvature R1 and R2 from the center to the position of the hill 5 from the center. In the example shown in FIG. 4 (b), the bottom surface of the bottom portion 2 is horizontal, and only the top surface is a curved surface having a large curvature radius R1 to gradually increase the wall thickness. In the example shown in FIG. 4C, the top surface of the bottom portion 2 is horizontal, and only the bottom surface is a curved surface having a large curvature radius R2, so that the thickness is gradually increased. However, instead of the curved surface, it may be an inclined surface that connects the R surface at the center and the R surface 8 of the rising curved portion 6c.

  As shown in FIG. 5 and FIG. 6, the electric rice cooker 10 of the present invention accommodates and receives any one of the non-metallic pans 1 and the non-metallic pan 1 so as to be detachable. A hollow vessel 12 for cooking rice by heating the heating element 3 of the non-metallic pan 1 by an alternating magnetic field from one heating coil 11 disposed between the bottoms 13a, 14a of the inner and outer cases 13, 14; The body 12 and the non-metallic pan 1 are opened and closed, and in a closed state, a lid 15 that discharges steam during cooking to the outside, and the body 13b of the interior case 13 made of a heat-resistant resin of the body 12 A plurality of body heaters 17 and shoulder heaters 18 are arranged from the lower part to the flange part 16 of the non-metallic pan 1 to the shoulder part 13c facing from below, and are made of metal provided inside the outer lid 62 of the lid body 15. A basic configuration in which a plurality of lid heaters 21 are arranged in the radial direction on the heat radiating plate 19. It is. As a result, the entire electric rice cooker 10 is downsized due to the reduction of dead space and the number of heating coils due to the high volume ratio of the non-metallic pan 1, and temperature compensation at each part by a large number of heaters 17, 18, 21. Accompanied by this, uniform heating during cooking and heat retention, prevention of condensation due to temperature unevenness, care, rice agitation, and crack prevention can be exhibited. Therefore, rice can be cooked deliciously and kept warm, and sufficient durability can be obtained.

  The flange portion 16 of the non-metallic pan 1 provides a sufficient pressure contact surface with a seal packing 23 provided on the outer periphery of an inner lid 22 made of metal such as aluminum that can be attached to and detached from the heat radiating plate 19 of the lid 15. In addition, even if there is a molding error of the non-metallic pan 1, steam leakage between the inner lid 22 and the upper end opening 20 of the non-metallic pan 1 can be reliably prevented. However, if the flange portion 16 is wide, the water breakage deteriorates, and therefore, a light inclination that decreases toward the inside is provided as shown in FIG. In the illustrated example, the inclination angle from the horizontal is 3 °. This inclination also acts to strengthen the pressure bonding without causing the seal packing 23 to be pressure bonded to the flange portion 16 to escape outward due to the vapor pressure. Further, the flange portion 16 is easily cooled by the outside air, and is particularly noticeable in a small-capacity rice cooker and easily causes condensation. However, as shown in FIG. 1, the flange portion 16 extends directly above the shoulder heater 18 and is easily heated. At the same time, the bulge portion 16a inwardly at the upper end opening 20, the bulge portion 16b bulges upward from the outer peripheral portion, and the base bulge portion 16c by the R-surface connection from the outer surface 6b of the barrel portion 6 are more in volume than the barrel portion 6. By increasing the heat storage property and making it easy to maintain the temperature rise state, condensation is prevented from occurring.

  Further, an operation panel 31 is provided on the front surface of the body of the exterior case 14, and a microcomputer board 32 on which a microcomputer provided on the inside is mounted and a control board 33 provided on the opposite side of the microcomputer board 32 cooperate. Then, the setting data from the operation panel 31, the corresponding control program, the temperature sensor 34 in contact with the center of the bottom of the non-metallic pan 1, and the temperature information from the lid sensor 34a on the radiator plate 19 shown in FIG. Based on the above, various cooking and heat insulation including rice cooking selected by controlling the heaters 17, 18, 21 and the heating coil 11 are performed. However, the non-metallic pan 1 has low thermal conductivity, and the temperature sensor 34 prevents the direct thermal influence from the heating element 3 in order to detect the temperature from the outer surface with high correlation with the rice cooking temperature. The inner circumference of the heating element 3 is separated from the temperature sensor 34 by a predetermined amount. As a result, the correlation between the temperature detected by the temperature sensor 34 and the cooking temperature can be obtained with high accuracy from experience, and appropriate heating control can be performed. Further, the rising curved portion 6c of the non-metallic pan 1 is smaller in thickness than the upper portion 6d, but has a small thickness and is curved, and a small radius between the bottom portion 13a and the trunk portion 13b of the interior case 13. Utilizing the shape, a space 35 slightly larger than the air gap 51 formed in the other part is formed between both sides, and the outside of the rising curved portion 6c is insulated from the air, and the interior case 13 The body heater 17 provided on the outer periphery of the body portion 13b is made to correspond to the space 35 to compensate for the lack of temperature at the rising curved portion 6c.

  More specifically, since the control board 33 is equipped with a heat generating component such as IGBT as a switching element for driving the heating coil 11, a heat sink 36 for cooling the heat generating component is provided, and a heat sink 36 is provided therebelow. Cooling is performed by blowing air from the cooling fan 37. Further, since the heating coil 11 also generates heat, the cooling fan 37 is provided with a guide portion by a partition wall 39 from a suction port 38 formed on the rear side of the synthetic resin bottom portion 14a of the outer case 14, and is sucked in a concentrated manner in FIG. Half of the outside air is passed through the installation area of the heating coil 11 between the bottom parts 13a and 14a of the outer cases 13 and 14 mainly by guiding the bottom part 13a of the inner case 13 and the coil base 44, and cooling the heating coil 11 In order to increase efficiency, the sucked outside air in the right half of FIG. 5 is blown to the heat sink 36 directly above and cooled, and then the heating coil 11 is cooled from the exhaust port 41 formed on the front side of the bottom portion 14a. With the outside air, the outside air blown to the heat sink 36 is exhausted from the exhaust port 41 by exhausting below the bottom portion 14a. As shown in FIG. 10, the air inlets 38 are formed in a range corresponding to the size just below the cooling fan 37, whereas the air outlets 41 are formed on the outer periphery of the front portion of the bottom portion 14a as shown in FIG. In order to allow the outside air to pass through the entire arrangement area of the heating coil 11, the exhaust gas extends over a wide area while increasing the opening degree at the center. It is also possible to prevent the heated outside air after cooling from being concentrated in one place and exhausted vigorously. Both the microcomputer board 32 and the control board 33 are covered with insulating covers 47 and 48 made of synthetic resin.

  The exterior case 14 is integrated by sandwiching a metal body 14b between a synthetic resin bottom 14a and a shoulder 14c, and the shoulder 14c is placed on the shoulder 13c of the interior case 13 and connected by screws 42. is doing. The shoulder heater 18 is housed and held in the heat radiating metal tube 92 between the shoulder portions 13c, 14c of the inner and outer cases 13,14. Further, the bottom portions 13a and 14a of the inner and outer cases 13 and 14 are connected by screws 43, and a resin coil base 44 is applied under the bottom portion 13a of the inner case 13 and attached by screws 45. 44 holds the heating coil 11, the temperature sensor 34, and the radially arranged ferrite 46 shown in FIGS. 6 and 8 that stabilize the alternating magnetic field oscillated by the heating coil 11.

  The container 12 receives the non-metallic pan 1 so as to be non-detachable leaving the air gap 51 between the inner case 13 and is provided at three locations in the circumferential direction near the outer periphery of the bottom portion 13 a of the inner case 13. By placing on an elastic support 52 such as silicon rubber, the flange 16 at the upper end of the non-metallic pan 1 has the air gap 53 shown in FIG. It faces the shoulder heater 18. Moreover, as shown in FIG. 6, the recessed part 54 for making easy the handing to the flange part 16 is formed between the flange part 16 of the nonmetallic pan 1, as shown in FIG.

  The bottom portion 14a of the outer case 14 may be formed of PP because there is no particular heat resistance problem, and the inner case 13 and the shoulder portion 14c, which require heat resistance in relation to the body heater 17 and the shoulder heater 18, have a heat resistant temperature. The PPS is as high as about 250 ° C.

  As described above, the heat of the heating element 3 provided on the outer surface of the non-metallic pan 1 is not efficiently transferred to the non-metallic pan 1 side, so that the heat is transferred to the bottom 13a side of the interior case 13 and the heating coil 11 side. If the rate of heat dissipation increases and rice cooking cannot be performed successfully, or if the heating temperature during cooking is increased to ensure the rice cooking temperature, local overheating on the non-metallic pan 1 side or heating element that becomes this local overheating part 3 may cause deterioration or melting of the bottom 13a of the interior case 13 due to heat radiation from the heat sink 3, and abnormal heating of the heating coil 11, which may impair the safety of the rice cooker and use.

  In order to cope with this, a heat-resistant plate 55 serving as a magnetically permeable heat-resistant member is disposed on a portion of the bottom case 13a of the interior case 13 facing the heat-generating body 3 in the non-metallic pan 1, and heat from the heat-generating body 3 is reflected. Like that. The heat-resistant plate 55 has a magnetic permeability from the non-metallic pan 1 side having the heating element 3 while ensuring that the heating element 3 can efficiently generate heat without interrupting the alternating magnetic field from the heating coil 11. The heat is cut off so as not to reach the heating coil 11. Therefore, the heating element 3 is provided on the outer surface of the non-metallic pan 1 as shown in the example, and heat is generated at a temperature higher than the rice cooking temperature for good cooking in the non-metallic pan 1 having low thermal conductivity. The heating coil 11 can be stably operated under normal air cooling even under the condition that the ratio of heat radiation to the outside becomes high. Moreover, the heat on the non-metallic pan 1 side does not reach the outer surface of the container 12. Moreover, the heat-resistant plate 55 reflects the heat from the non-metallic pan 1 side to the non-metallic pan 1 side, secondary heats the non-metallic pan 1 and uses it again to heat the cooked rice, thereby increasing 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 with the characteristic that the heat of the non-metallic pan 1 can be easily increased. Further, the heat-resistant plate 55 functions for a long time without being deteriorated or damaged due to its heat resistance.

  Here, the heat-resistant plate 55 is preferably made of non-metal or non-resin from the viewpoint 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 3 is a white reflective surface, the heat absorption is avoided and the reflectance can be increased. When the white of the reflecting surface is ceramic, it is easily realized by the firing temperature, and a glossy specular reflecting surface 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 may be about 3 to 5 μm, for example. When the ceramic is transparent, the white reflective surface may be applied to the surface of the heat-resistant plate 55 or the back surface, and both can be selected. However, if the back surface of the heat-resistant plate 55, that is, the surface facing the interior case 13 is a rough surface and is adhered to the interior case 13, the adhesion is improved. The adhesive is silicon-based and is water-curable and easy to handle. The surface roughness of the back surface of the heat-resistant plate 55 having a rough surface is preferably about 30 μm, and the surface roughness of the back surface is preferably about 10 to 6 times that of the reflective surface.

  The heat-resistant plate 55 reflects heat from the heating element 3 and the like toward the non-metallic pan 1 and must avoid contact with each other. Accordingly, it is essential to provide an air gap 56 between the non-metallic pan 1 and the heating element 3 and the heat-resistant plate 55. In particular, it is desirable that the air gap 56 is a closed space and is opened to at least the surrounding air gap 51 so that heat is not generated. The elastic support base 52 receives the non-metallic pan 1. It is secured by supporting. The placement and support of the non-metallic pan 1 on the elastic support base 52 also exhibits the effect of the elastic support and non-rotation of the non-metallic pan 1. On the other hand, as shown in FIGS. 5 and 6, the air gap 56 is formed over the entire area together with the air gap 51 between the body portion between the interior case 13 and the nonmetallic pan 1 from the nonmetallic pan 1 side. While preventing the heat effect on the inner case 13 side, the heat is spread between the inner case 13 and the non-metallic pan 1, and the non-metallic pan is thick and has a low thermal conductivity. It becomes easy to promote heating efficiency and uniform heating in cooperation with heating of No. 1 and rice cooking. In particular, the heat-resistant plate 55 provided in the interior case 13 of the container body 12 is easy to make use of the heat reflected on the non-metallic pan 1 side. .

  Furthermore, the heat-resistant plate 55 has a hole 57 in the central portion for bringing the temperature sensor 34 into contact with the non-metallic pan 1 and is larger than the outer diameter of the opposing heating element 3. Thereby, the temperature sensor 33 can detect the temperature of the center part of the bottom part of the pan 1 having high correlation with rice cooking through the hole 57 in the center part. For this purpose, as shown in FIGS. 5 and 6, the temperature sensor 34 is provided at the center of the coil base 44 and is urged upward by a spring 58 to penetrate the bottom 13 a of the interior case 13 and the heat-resistant plate 55. On top of that, a behavior that always protrudes is given, and the temperature of the non-metallic pan 1 can be monitored by being pressed against the bottom 2 of the non-metallic pan 1 placed on the elastic support base 52.

  The lid 15 is supported by a shaft 61 at the rear of the vessel body 12 so as to be opened and closed, and an outer lid 62 for opening and closing the vessel body 12 with its shoulder portion 14c, and an inner lid 22 for opening and closing the non-metallic pan 1 As a double structure. The inner lid 22 is provided with a vapor discharge chamber 64 having a pressure regulating check valve 63 at the center. The steam discharge chamber 64 separates the steam flowing in through the steam hole of the inner lid 22 and discharges it to the outside from the central opening 65 of the outer lid 62. Further, the separated rice ball is returned to the inner lid 22, the inner lid 22 flows out thereon, and the rice cake returned from the vapor discharge chamber 64 is appropriately returned to the non-metallic pan 1. The outer lid 62 is formed hollow by a resin outer plate 62a and a resin inner plate 62b in which the heat sink 19 is fitted in the center, and between the mouth edges of the central opening 65 between the outer plate 62a and the heat sink 19 A seal packing 66 is sandwiched between them, and the vapor discharge chamber 64 is elastically fitted to the seal packing 66 so that it can be attached and detached from below, sealing the both, and elastically supporting the inner lid 22. However, the inner lid 22 can be removed from the outer lid 62 and washed. Further, a seal packing 67 is sandwiched between the heat radiating plate 19 and the inner plate 62b of the outer lid 62 so as to be crimped to the outer periphery of the inner lid 22 to seal the both, and the inner lid 22 is made of a non-metallic pan 1. It is made to make it crimp to. As a result, the vapor is released only through the vapor discharge chamber 64. In order to guarantee this, the outer lid 62 is provided with a lock lever 72 at its free end, and elastically engages with a locking portion 71 formed on the shoulder portion 14c of the container body 12 by the bias of the spring. 62 is locked in a closed state so as to ensure the sealing state of each of the above parts. In order to release the lock, the operation portion 72a of the lock lever 72 may be pressed against the spring to disengage from the locking portion 71. The lid body 15 is urged in the opening direction by a spring 73 that is moved between the lid body 15 and the vessel body 12 around the shaft 61, and is slowly opened under moderate braking by the spring 73 together with unlocking. A heat insulating material 93 is provided on the outer periphery of the body heater 17 and on the upper portion of the lid heater 21 to prevent heat radiation to the outside and enhance thermal efficiency.

  The present invention is applied to a non-metallic pan having a heating element that generates heat by electromagnetic induction, and is suitable for a small-capacity type by simplifying the form and heating method without problems of uneven heating and uneven heating. .

Brief Description of Drawings
It is the side view which looked at the half part which showed one example of the nonmetallic pan for electric rice cookers which concerns on embodiment of this invention. It is a bottom view of the pan. It is sectional drawing of the half part which shows another example of the same pan. It is principal part sectional drawing which compares and shows three examples which gradually increased the thickness of the bottom part from the center to the hill part in the other example of the pan. It is sectional drawing in the front-back direction which shows the electric rice cooker of this Embodiment which employ | adopted the nonmetallic pan shown in FIG. It is sectional drawing in the left-right direction of the rice cooker. It is a top view shown across the half part of the rice cooker. It is the bottom view seen by removing the bottom of the rice cooker. It is a front view of the rice cooker. It is a bottom view of the rice cooker.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Nonmetallic pan 2 Bottom part 3 Heating element 4 Stationary surface 5 Height 6 Body 6a Inner surface 6b Outer surface 6c Standing curved part 6d Upper part 7 Extension line 10 Electric rice cooker 11 Heating coil 12 Body 13 Interior cases 13a, 14a Bottom part 13b, 14b Body part 13c, 14c Shoulder part 14 Exterior case 15 Cover body 16 Flange part 17 Body part heater 18 Shoulder heater 19 Heat sink 21 Cover heater A, B, C Thickness X0 Total accommodation area X Heating area X1 Cylindrical area X2 Standing position X3 Step

Claims (5)

  The bottom surface is equipped with a heating element that generates heat by electromagnetic induction, and a hill that floats the heating element from the stationary surface. The hill is almost continuous with the outer surface of the rough body and extends from the inner surface of the body. A non-metallic pan for a rice cooker, characterized in that it is provided on the line or on the outside thereof.   The non-metallic pan for a rice cooker according to claim 1, characterized in that the thicknesses of the bottom portion bordering the hill and the rising curved portion from the bottom portion of the trunk portion are substantially equal.   The non-metal pan for a rice cooker according to claim 2, wherein the rising position of the rising curved portion substantially corresponds to the minimum cooking water level or is near the lower side thereof.   The non-metallic pan for a rice cooker according to any one of claims 1 to 3, wherein the hill is continuous all around.   The non-metallic pan according to any one of claims 1 to 4 and the non-metallic pan are accommodated and received so as to be detachable from the heating coil disposed between the bottom of the inner and outer cases. An apparatus that cooks rice by heating a heating element of a non-metallic pan with an alternating magnetic field, and a lid that opens and closes the container and the non-metallic pot and discharges steam during cooking to the outside in a closed state. A plurality of heaters are arranged from the lower part of the trunk of the interior case of the container to the flange part of the non-metallic pan from the lower part to the shoulder part opposed to the flange part. An electric rice cooker characterized by being arranged in the direction.

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