JP2007260205A - Electric rice cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To favorably match inner pots with rice cooker bodies. <P>SOLUTION: This electric rice cooker which has the rice cooker bodies 1 detachably storing the inner pots 3 composed of a non-metal material is so constituted that a plurality of types of inner pots 3, 3, etc. having different small/large dimensional standards by selection and a plurality of types of rice cooker bodies 1, 1, etc. fitted to the inner pots 3, 3, etc. are prepared, and a rice cooking body 1 to be attached is selected and combined according to the dimension of an inner pot 3. When the inner pots 3 are composed of a non-metal material, large dimensional dispersions are produced in the radial direction and the height direction in the manufacture, however, this constitution can favorably retain the matching between the inner pot 3 and the rice cooker body 1. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electric rice cooker, and more particularly to an electromagnetic induction type electric rice cooker having an inner pot made of a non-metallic material.

  As a well-known electric rice cooker, a rice cooker body configured to detachably accommodate a metal inner pot, and an inner peripheral surface of the rice cooker body and the inner pot There is a thing provided with the protection frame which supports at the time of accommodation, and the electromagnetic induction coil which generates electromagnetic induction in the inner pot. In this way, in the case of an electric rice cooker using a metal inner pot, the inner pot can be manufactured with high accuracy, so the dimensional variation of the inner pot is extremely small, and consideration is given to matching between the rice cooker body and the inner pot There is no need to do.

  By the way, in recent years, attempts have been made to use an inner pot made of a non-metallic material (for example, an earthen pot, a ceramic pot, or a charcoal pot) as an inner pot in order to improve the cooking of rice. In this case, since the inner pot itself does not generate heat due to electromagnetic induction, an induction heating element is provided at the bottom of the inner pot and in the vicinity of the bottom (for example, a curved portion between the bottom and the side wall), and the heating element is electromagnetically induced. The inner pan is heated by induction heating by a magnetic field generated from the coil (see Patent Document 1).

Japanese Patent Application Laid-Open No. 2004-141456.

  However, in the case of an inner pot made of a non-metallic material (for example, an earthen pot or a ceramic pot), the manufacturing method is completely different from that of a metal inner pot, and dimensional variation (for example, dimensional variation in the radial direction and height direction). Will become bigger. Then, matching between the rice cooker body and the inner pot becomes a problem. When this dimensional variation occurs, the difference between the induction coil on the rice cooker body side and the induction heating element on the inner pot side can make a difference, so the rice cooking characteristics do not match the actual situation, and the cooked rice will not be good There is a risk of malfunction. However, the technique disclosed in Patent Document 1 does not mention this problem at all.

  Also, if the inner pot is damaged and needs to be replaced (after-sales support), the rice cooker itself is at hand, making it difficult to check whether the damaged inner pot is large or small. There may be cases where it is not possible to respond sufficiently.

  This invention is made | formed in view of said point, and it aims at obtaining favorable matching with an inner pot and a rice cooker main body.

  In this invention, as a 1st means for solving the said subject, the rice cooker main body which detachably accommodates the inner pot which consists of nonmetallic materials, and the cover body which covers the upper opening of this rice cooker main body removably And a protective frame that constitutes the inner peripheral surface of the rice cooker body and supports the inner pot when housed, and an electromagnetic induction coil disposed on the outer surface of the bottom of the protective frame, and the electromagnetic in the inner pot In an electric rice cooker in which induction heating elements each generating eddy currents are provided by the electromagnetic induction coil at positions facing the induction coil, a plurality of types of inner pots having different dimensional standards by sorting, and these A plurality of types of rice cooker bodies suitable for the inner pot are prepared in advance, and the rice cooker body to be attached is selected and combined according to the dimensions of the inner pot.

  By configuring as described above, in the case of an inner pan made of a non-metallic material, large dimensional variations occur in the radial direction and the height direction at the time of manufacture, but a plurality of types of inner pots having different dimensional standards by sorting, Since it prepares in advance and prepares multiple types of rice cooker bodies that are suitable for these inner pots, and is configured to select and combine the rice cooker bodies to be attached according to the dimensions of the inner pot, Matching with the rice cooker body will be well maintained. Therefore, the distance between the electromagnetic induction coil on the rice cooker body side and the induction heating element on the inner pot side can be different, and the rice cooking characteristics do not match the actual situation, and there is no possibility of causing the problem that the cooking of the rice does not become good. .

  In the present invention, as a second means for solving the above problems, in the electric rice cooker provided with the first means, as the electromagnetic induction coil, a bottom electromagnetic induction coil facing the bottom surface of the inner pot. And a bending portion electromagnetic induction coil facing the bending portion from the bottom surface to the side surface of the inner pot, and the dimensions of the bending portion electromagnetic induction coil are changed in accordance with the dimensional standard of the inner pot. In such a case, the dimension of the bending portion electromagnetic induction coil can be changed corresponding to the change in the distance between the bending portion electromagnetic induction coil and the inner pot that is greatly affected by the variation in the size of the inner pot. Therefore, the rice cooking characteristics can always be kept good.

  In the present invention, as a third means for solving the above-mentioned problem, in the electric rice cooker provided with the second means, the dimension of the bottom electromagnetic induction coil varies depending on the dimension standard of the inner pot. It can also comprise so that it may not be made, and when comprised in that way, it will respond to the variation of an inner pot only by the dimension adjustment in a bending part electromagnetic induction coil, and can suppress a cost increase.

  In the present invention, as a fourth means for solving the above-mentioned problems, in the electric rice cooker provided with the first, second or third means, the type of the inner pot is a dimensional standard in the radial direction. It is possible to provide two kinds of large and small different sizes, and to provide an intermediate overlap portion that overlaps between the two large and small size standards as a standard for sorting. In such a configuration, when sorting the inner pot, It is possible to narrow the range, and by providing an intermediate overlap part, if you prepare an inner pan for the intermediate overlap part, it will be compatible with both large and small rice cooker bodies, making after-sales easy It becomes.

  According to the first means of the present invention, a rice cooker body that detachably houses an inner pot made of a non-metallic material, a lid body that covers the upper opening of the rice cooker body so as to be openable and closable, and the rice cooker body A protective frame that supports the inner pot when housed and an electromagnetic induction coil disposed on the outer surface of the bottom of the protective frame, and a position facing the electromagnetic induction coil in the inner pot In an electric rice cooker in which induction heating elements that generate eddy currents are provided by the electromagnetic induction coils, they are suitable for a plurality of types of inner pots of different sizes based on the selection, and for these inner pots. Because it is configured to prepare and prepare multiple types of rice cooker main body, and select and combine the rice cooker main body to be attached according to the size of the inner pot, the matching between the inner pot and the rice cooker main body is good Retained Therefore, there may be a difference in the distance between the electromagnetic induction coil on the rice cooker body and the induction heating element on the inner pot side, the rice cooking characteristics will not match the actual situation, and there may be a problem that the cooking of rice will not be good It has the effect of disappearing.

  As in the second means of the present invention, in the electric rice cooker provided with the first means, as the electromagnetic induction coil, from the bottom electromagnetic induction coil facing the bottom surface of the inner pot, and the bottom surface of the inner pot While adopting a bending portion electromagnetic induction coil facing the bending portion over the side, the size of the bending portion electromagnetic induction coil can be changed corresponding to the dimensional standard of the inner pot, and so configured In this case, it is possible to change the dimensions of the bending portion electromagnetic induction coil in response to the change in the distance between the bending portion electromagnetic induction coil and the inner pot, which is greatly affected by the dimensional variation of the inner pot, so the rice cooking characteristics are always good. Can be held in.

  As in the third means of the present invention, in the electric rice cooker provided with the second means, the size of the bottom electromagnetic induction coil can be configured not to change depending on the size standard of the inner pot. And when comprised in that way, it will respond to the variation of an inner pot only by the dimension adjustment in a bending part electromagnetic induction coil, and can suppress a cost increase.

  As in the fourth means of the present invention, in the electric rice cooker provided with the first, second or third means, the type of the inner pot is classified into two types, large and small, having different dimensional standards in the radial direction. An intermediate overlap portion that overlaps between the two types of large and small size standards can be provided as a reference to be performed, and when configured in such a manner, it becomes possible to narrow the range of variation when selecting the inner pot. At the same time, by providing an intermediate overlap portion, if an inner pan of the intermediate overlap portion is prepared, it can be used for both large and small rice cooker bodies, and after-sales support becomes easy.

  Hereinafter, several preferred embodiments of the present invention will be described with reference to the accompanying drawings.

First Embodiment FIG. 1 shows an electric rice cooker according to a first embodiment of the present invention.

  This electric rice cooker is configured to accommodate an inner pot 3 for rice cooking inside, and has a double structure rice cooker body 1 having a space portion 4, and opens and closes and opens and closes the upper opening of the rice cooker body 1. And a lid 2 that freely covers the lid.

  The rice cooker body 1 includes a sheet metal outer case 5 constituting an outer wall, a synthetic resin bottom member 6 constituting a bottom wall, a synthetic resin shoulder member 7 constituting a shoulder portion, and an inner peripheral wall. And a bottomed cylindrical protective frame 8 made of synthetic resin, and the space 4 is formed surrounded by the outer case 5, the bottom member 6, the shoulder member 7 and the protective frame 8. . The inner pot 3 is accommodated in the protective frame 8 so as to be removable.

  The inner pot 3 is made of a pan made of a non-metallic material (for example, an earthen pot, a ceramic pot, a charcoal pot, or the like). The bottom surface and the curved surface extending from the bottom surface to the side peripheral surface include a bottom portion and a curved surface. Part induction heating elements (for example, silver paste etc.) 9A, 9B are stuck.

  A ceramic heat shield plate 11 for shielding radiant heat from the bottom induction heating element 9 </ b> A is attached to the inner bottom portion of the protective frame 8. Sensor holes 13 and 14 for facing the center sensor 12 acting as temperature detecting means for detecting the inner pot temperature are formed in the center of the bottom surface of the protective frame 8 and the heat shield plate 11, respectively. ing.

  Further, an annular support leg 3 a is integrally projected on the outer periphery of the bottom of the inner pot 3, and the support leg 3 a is arranged on the outer side of the heat shield plate 11 in a circumferentially spaced manner. The inner pot 3 is supported within the protective frame 8 by placing it on the upper surface of three elastic bodies 34 (two are not shown) provided on the protective frame 8. Therefore, a heat insulating space 33 is formed between the bottom of the inner pot 3 (ie, the bottom heating element 9A) and the protective frame 8 (ie, the heat shield plate 11).

  Moreover, the side wall upper part 3b and the flange part 3c of the inner pot 3 are made thicker than the other parts (that is, the bottom part 3d and the side wall lower part 3e). By doing so, it is possible to secure the strength at the side wall upper portion 3b and to improve the heat retention effect by increasing the heat capacity. As the induction heating elements 9A and 9B, a metal plate other than silver paste can be adopted.

  An annular bottom portion and bending portion electromagnetic induction coils (hereinafter referred to as a bottom portion and a bending portion IH coil) 15A and 15B that act as heating means at the time of rice cooking so as to surround the sensor holes 13 and 14 are the bottom surface of the protective frame 8 and The curved portions between the bottom surface and the side peripheral surface (in other words, the induction heating elements 9A and 9B) are disposed. The bottom and bending portion IH coils 15A and 15B generate an alternating magnetic field, and generate eddy currents in the bottom and bending portion induction heating elements 9A and 9B by electromagnetic induction of the alternating magnetic field. By utilizing resistance heat, the bottom and bending portion induction heating elements 9A and 9B generate heat, and the inner pot 3 is heated by the heat of the bottom and bending portion induction heating elements 9A and 9B.

  The bottom IH coil 15A is sandwiched between a coil die 16 fixed to the bottom surface of the protective frame 8 and the bottom surface of the protective frame 8, while the curved portion IH coil 15B is an outer periphery of the coil die 16. Are held between the protective frame 8 and the coil support portions 16a, 16a,. Reference numeral 20 denotes a ferrite core, in which four wires are radially arranged below the bottom and the curved portions IH coils 15A and 15B, and the magnetism generated by the bottom and the curved portions IH coils 15A and 15B is present below. It acts to shield it from affecting it.

  A center sensor 12 is provided in the sensor holes 13 and 14 so as to be in contact with the bottom of the inner pot 3 (specifically, the bottom heating element 9A). Further, a side heater 23 acting as a heating means at the time of rice cooking and heat insulation is attached to the side peripheral surface of the protective frame 8 so as to face the thick portion of the side wall upper portion 3b of the inner pot 3.

  The protective frame 8 is vertically divided into two parts, and includes a lower protective frame 8a made of synthetic resin for holding the IH coils 15A and 15B and an upper protective frame 8b made of sheet metal for holding the side heater 23. The side heater 23 is arranged on the outer peripheral surface of the upper protective frame 8b.

  On the other hand, the lid body 2 is configured to have a space portion 19 between an upper plate 17 constituting an outer surface and a lower plate 18 constituting an inner surface, and water vapor generated at the time of rice cooking is formed in the center portion thereof. A steam discharge cylinder 10 is attached for discharging the gas. The lower plate 18 includes an annular lower plate main body 18a constituting an outer peripheral portion and a donut-shaped heat radiating plate 18b constituting an inner peripheral portion. A lid heater is provided on the upper surface of the heat radiating plate 18b. 22 is disposed. An inner lid 21 that seals the opening of the inner pot 3 when the lid 2 is closed is attached to the lower surface of the lid 2. Reference numeral 24 is a steam vent formed in the inner lid 21.

  A first lid seal packing 25 that seals between the lid body 2 and the inner lid 21 when the lid body 2 is closed is formed at a joint portion between the lower plate body 18 a and the heat radiating plate 18 b in the lid body 2. It is installed. A second lid seal packing 26 that seals the lid 2 (specifically, the inner lid 21) and the opening of the inner pot 3 when the lid 2 is closed is provided on the outer peripheral edge of the inner lid 21. Is provided. The sealing positions of the first lid seal packing 25 and the second lid seal packing 26 are set to the vertical position.

  By the way, as described above, a pan made of a non-metallic material (for example, an earthen pan, a ceramic pan, a charcoal pan, or the like) is adopted as the inner pan 3. A large variation (for example, a variation of −1.5 mm to +1.5 mm) occurs in the vertical dimension and the radial dimension.

  Therefore, in the present embodiment, at the time of sorting the inner pot 3, as shown in FIG. 2, for example, the one having a tolerance of −1.5 mm to +0.5 mm is used as a small pot, while −0.5 mm to +1. A pan having a tolerance of 0.5 mm is used as a large pan so that a range of −0.5 mm to +0.5 mm is an intermediate overlap portion. In this case, conventionally, when the inner pot 3 is damaged, and after-sales support for replacing the inner pot 3 to the user, it takes time to confirm the size of the inner pot 3, but this corresponds to the overlap portion. If the inner pot 3 to be prepared is prepared for after-sales, it can be handled regardless of the size of the rice cooker body 1 (that is, the size of the rice cooker body 1 corresponding to the size of the inner pot 3). . In other words, the efficiency when dealing with after sales is greatly improved.

  Moreover, as shown in FIG. 3, the inner pot 3 is sorted into three types of “large pot”, “medium pot”, and “small pot”, and the rice cooker body 1 corresponds to the inner pot 3 of each size. If two types of “large” and “small” are prepared, the inner pot 3 in the range of the intermediate overlap portion can be used in either the large or small rice cooker body 1 and the productivity is improved.

  In addition, the inner pot 3 is divided into two types, “large pot” and “small pot”, and the rice cooker body 1 is also divided into “for large pot” and “for small pot”. As a result, product performance can be stabilized. In this case, the function of the electric rice cooker having the rice cooker body 1 for “large pot” and the function of the electric rice cooker having the rice cooker body 1 for “small pot” are made different from each other, respectively. If it is set as an electric cooker and a B type electric rice cooker, when supplying the inner pot at the time of after-sales, it is clear which of the inner and outer pots should be handed over to the user simply by checking the model.

Moreover, the identification method at the time of distinguishing the inner pot 3 in size and the rice cooker main body 1 in size is performed as follows.
(1) Inner pan 3 side (A) Differentiate by the color of the water scale formed on the inner surface of the inner pan 3 (for example, change the color between large, medium and small).

(B) Differentiate by the model number portion of the inner pot 3 (for example, large: KFA10B / 15B, medium: KFA10 / 15, small: KFA10S / 15S, etc.).
(2) Rice cooker body 1 side (a) Differentiate by the lot printing part of the rated sticker (for example, large: ****** B, medium: ******, small: ****** S).

  (B) Differentiate by the color pattern of the elastic body 34 that adjusts in the height direction (for example, large: gray, medium: natural, small: black).

  (C) A mark such as a ruled line or printed mark is provided on the inner side of the heat radiating plate 8b to distinguish them (for example, large: one mark or ruled line, medium: no mark, etc., small: small plural).

  If it carries out as mentioned above, from the place where the response | compatibility with the inner pot 3 and the rice cooker main body 1 becomes clear, productivity and after-sales compatibility will improve.

2nd Embodiment The principal part of the electric rice cooker concerning 2nd Embodiment of this invention is shown by FIG.

  In this case, since the distance between the bending portion IH coil 15B and the curved surface of the inner pot 3 changes due to the dimensional variation of the inner pot 3, the following means is used.

  The bending portion IH coil 15B is sandwiched at a predetermined position between the protection frame 8 (specifically, the lower protection frame 8a) and the coil die 16, but the lower protection frame 8a and the coil die 16 have a bending portion IH. Positioning ribs 35 and 36 for sandwiching the coil 15B are formed. As shown in FIG. 4 (a), when the inner pot 3 is a “medium pot” (that is, a normal product), a predetermined gap is provided between the bending portion IH coil 15B and the positioning rib 35 on the lower protective frame 8a side. By interposing the packing 37 having a thickness, the distance between the curved portion IH coil 15B and the curved surface of the inner pot 3 is set to 9.6 mm. However, when the inner pot 3 is a “small pot” (that is, a lower limit product) due to the dimensional variation of the inner pot 3, a predetermined gap is provided between the bending portion IH coil 15B and the positioning rib 35 on the lower protective frame 8a side. If the packing 37 having a thickness is left interposed, the distance between the curved portion IH coil 15B and the curved surface of the inner pot 3 increases to 10.6 mm as shown in FIG. The electromagnetic induction function of coil 15B will fall. Accordingly, as shown in FIG. 4C, when the packing 37 is interposed between the rib 36 on the coil die 16 side and the bending portion IH coil 15B, the bending portion IH coil 15B and the curved surface of the inner pot 3 The distance is approximately 9.2 mm, which is almost the same as that of the normal inner pot 3. In this way, regardless of the size of the inner pot 3, the electromagnetic induction function by the bending portion IH coil 15B can be maintained in the normal state only by changing the mounting position of the packing 37. Note that there is no need to change the bottom IH coil 15A.

  Since other configurations and operational effects are the same as those in the first embodiment, the description thereof is omitted.

Third Embodiment FIG. 5 shows an electric rice cooker according to a third embodiment of the present invention.

In this case, the coil die 16 is divided into a bottom coil die 16A on the bottom IH coil 15A side and a bending portion coil die 16B on the bending portion IH coil 15B side. Prepare (for example, the bending portion coil die 16B ₁ having a height of the rib 36 of 1.5 mm and the bending portion coil die 16B ₂ having a height of the rib 36 of 2.8 mm). When the inner pot 3 is a “medium pot” (that is, a normal product), the bending portion IH coil 15B and the inner pot 3 are bent by using the bending portion coil die 16B ₁ as shown in FIG. The distance from the surface is 9.6 mm. However, when the inner pot 3 is a “small pot” (that is, the lower limit product) due to the dimensional variation of the inner pot 3, if the bending portion coil die 16B ₁ is used as it is, as shown in FIG. The distance between the part IH coil 15B and the curved surface of the inner pot 3 expands to 10.6 mm, and the electromagnetic induction function of the curved part IH coil 15B decreases. Therefore, as shown in FIG. 5C, when the bending portion coil die 16B ₂ is used, the distance between the bending portion IH coil 15B and the curved surface of the inner pot 3 is approximately the same as that in the case of the normal inner pot 3. .2mm. If it does in this way, regardless of the size of the inner pot 3, the electromagnetic induction function by the bending part IH coil 15B can be kept in a normal state only by changing the bending part coil die 16B. Note that there is no need to change the bottom IH coil 15A.

  Since other configurations and operational effects are the same as those in the first embodiment, the description thereof is omitted.

4th Embodiment The principal part of the electric rice cooker concerning 4th Embodiment of this invention is shown by FIG. 6 thru | or FIG.

  In this case, as shown in FIG. 3, the inner pot 3 is sorted into three types of “large pot”, “medium pot”, and “small pot” within a tolerance range of 1 mm. On the other hand, a method of adjusting the bending portion induction heating element 9B is adopted. The rice cooker body 1 is common.

(1) When adjusting with the width dimension L of the induction heating element 9B As shown in FIG. 6 (b), if the width dimension of the induction heating element 9B when the inner pot 3 is a “medium pot” is L, When the pan 3 is a “small pan”, as shown in FIG. 6 (a), the width of the induction heating element 9B is L + 2.0 mm, and when the inner pan 3 is a “large pan”, FIG. ), The width of the induction heating element 9B is L-2.0 mm.

(2) When adjusting with the thickness dimension D of the induction heating element 9B As shown in FIG. 7 (b), when the thickness dimension of the induction heating element 9B when the inner pot 3 is the “medium pot” is D. When the inner pot 3 is a “small pot”, as shown in FIG. 7A, the thickness of the induction heating element 9B is D + 0.5 mm, and when the inner pot 3 is a “large pot”, As shown in 7 (c), the thickness of the induction heating element 9B is D-0.5 mm.

(3) When adjusting the thickness of the induction heating element 9B by partially changing the thickness of the induction heating element 9B when the inner pot 3 is a “medium pot” as shown in FIG. Assuming D, when the inner pan 3 is a “small pan”, the induction heating element 9B has a portion with a thickness dimension of D and a portion with a thickness dimension greater than D, as shown in FIG. When the inner pot 3 is a “large pot”, as shown in FIG. 8C, the induction heating element 9B has a portion with a thickness dimension of D and a portion with a thickness dimension thinner than D. It is supposed to be.

  As described above, when the rice cooker main body 1 side is common and adjusted by the bending portion induction heating element 9B, the output of the bending portion IH coil 15B falls within the range of variation no matter what inner pot 3 is combined. It becomes. Therefore, since the rice cooker main body 1 can be made common, management becomes easy.

  Since other configurations and operational effects are the same as those in the first embodiment, the description thereof is omitted.

Fifth Embodiment FIG. 9 shows a main part of an electric rice cooker according to a fifth embodiment of the present invention.

In this case, the coil die 16 is divided into a bottom coil die 16A on the bottom IH coil 15A side and a bending portion coil die 16B on the bending portion IH coil 15B side. are prepared two kinds having ribs 38, 39 made different heights of the engaging portion, when the inner pot 3 of the "small pot", as illustrated in FIG 9 (b), a rib 38 height H ₁ When the inner pot 3 is a “large pot”, the bottom coil die 16A having the rib 39 having a height H ₂ is used as shown in FIG. Here, H ₁ <H ₂ is satisfied.

  If it does in this way, regardless of the size of the inner pot 3, the electromagnetic induction function by the bending part IH coil 15B can be kept in a normal state only by changing the bottom coil die 16A.

  Since other configurations and operational effects are the same as those in the first embodiment, the description thereof is omitted.

Sixth Embodiment FIG. 10 shows an electric rice cooker according to a sixth embodiment of the present invention.

  In this case, when the inner pot 3 is made of a non-metallic material (for example, earthen pot), it is a ceramic, so the shrinkage rate is larger than that of a metal press pan, and the dimensional tolerance is larger (for example, in the height dimension, The difference between the large limit and the small limit is about 4 mm). If the inner pot 3 is placed on the inner bottom surface of the rice cooker body 1 and the distance between the IH coils 15A and 15B is kept constant, the sealing performance between the upper part of the inner pot 3 and the lid 2 may be difficult. There is.

  Therefore, in the present embodiment, the inner pot 3 is selected into two types of “large pot” and “small pot”, the height dimension tolerance is changed from 4 mm to 2 mm, and the rice cooker body 1 is an inner pot. The basic configuration is taken according to the dimensions when 3 is “small pot”.

  In this case, a cylindrical member 40 is provided to couple the bottom member 6 and the shoulder member 7 together. The cylindrical member 40 includes a large-diameter cylindrical portion 40a having an engaging rib 42 that engages with an upper end opening edge of an engaging cylinder 41 standing on the bottom member 6 at a lower end, and an upper end of the large-diameter cylindrical portion 40a. The bottom member 6 and the shoulder member are formed by connecting the upper end of the small diameter cylindrical portion 40b to the shoulder member 7 via a screw 44. The small diameter cylindrical portion 40b extends upward through the step portion 43. 7 is to be combined. And the said small diameter cylinder part 40b is inserted in the through-hole 46 formed in the cyclic | annular collar part 45 integrally extended by the upper end outer periphery of the lower protective frame 8a, In this state, the said collar The portion 45 is locked to the stepped portion 43 so that the lower protective frame 8b is positioned.

  When configured as described above, as described above, the inner pan 3 is placed on the inner bottom surface of the rice cooker body 1 due to the variation in the height of the inner pan 3, and the distance from the IH coils 15A and 15B is constant. If it is made to maintain, there exists a possibility that the sealing performance of the upper part of the inner pot 3 and the cover body 2 may become difficult. Therefore, in the present embodiment, when the inner pot 3 is a “large pot”, as shown on the right side of FIG. 10, the collar portion 45 is directly locked to the stepped portion 43, but the inner pot 3 is a “small pot”. In some cases, as shown on the left side of FIG. 10, an annular spacer 47 having a predetermined thickness (for example, 2 mm in thickness) is interposed between the flange portion 45 and the step portion 43. If it does in this way, the position of the upper end opening of the inner pot 3 with a low height dimension will correspond with the position of the upper end opening of the inner pot 3 with a high height dimension. Therefore, even if the inner pot 3 having a large dimensional variation in the height direction is adopted, the dimensional variation of the inner pot 3 can be absorbed with a small investment of attaching and detaching the spacer 47, and the upper end opening and the lid 2 of the rice cooker body 1. Can be secured. As shown in FIG. 11, a convex portion 48 that holds the spacer 47 between the step portion 43 and the spacer 47 is integrated with the lower end portion of the small-diameter cylindrical portion 40b. Projected to As shown in FIG. 12, the outer diameter of the convex portion 48 is substantially the same as the inner diameter of the through hole 46 so that the collar portion 45 can be locked to the step portion 43 when the spacer 47 is not used. Has been.

  By the way, since the cylindrical member 40 has a long height, if it is composed of one part, the diameter of the large-diameter cylindrical portion 40a on the bottom member 6 side increases due to the draft angle of the mold, and the rice cooker body 1 There is a risk that the projected area of the will increase. In addition, the mold is also opened, and the size is increased, resulting in a larger size. Therefore, in the present embodiment, the cylindrical member 40 is divided in the radial direction (that is, divided into two) to increase the size by the draft and the size of the mold opening dimension.

  Further, an elastic member 27 that is in contact with an outer peripheral surface (for example, a bottom surface) of the inner pot 3 when the inner pot 3 is accommodated is interposed in the inner peripheral portion of the heat shield plate 11. In this case, the elastic member 27 has a height that comes into contact with the bottom surface of the inner pot 3 before the support leg 3 a of the inner pot 3 comes into contact with the upper surface of the heat shield plate 11. Is in contact with the outer portion of the support leg 3a. If it does in this way, even if there is variation in the size of the inner pot 3, the distance between the bottom induction heating element 9A and the bottom IH coil 15A when the inner pot 3 is accommodated can be kept constant at all times. Variations can be suppressed as much as possible.

  Furthermore, in the present embodiment, the upper protective frame 8b is made of synthetic resin, and the inner pot is placed between the upper protective frame 8b and the shoulder member 7 when the inner pot 3 is accommodated. 3, an elastic member 29 is provided on the outer peripheral surface (for example, the side peripheral surface). If it does in this way, even if the radial direction dimension of the inner pot 3 will vary, it becomes possible to match the center of the inner pot 3 and the center of the rice cooker body 1 by the urging force of the elastic member 29, and guide the curved portion. The matching distance between the heating element 9B and the bending portion IH coil 15B is not affected. In addition, although the said elastic member 29 is desirable to be cyclic | annular considering the hot air accumulation condition and heat retention at the time of rice cooking, it is good also considering the site | part provided in the inner pot 3 as a protrusion shape of a predetermined space | interval.

  Since other configurations and operational effects are the same as those in the first embodiment, the description thereof is omitted.

Seventh Embodiment FIG. 13 shows an electric rice cooker according to a seventh embodiment of the present invention.

In this case, in the electric rice cooker according to the sixth embodiment, the upper protective frame 8b is made of sheet metal, and curling portions 49 and 50 are formed at the upper and lower ends of the upper protective frame 8b. When the inner pot 3 is a “large pot”, as shown on the right side of FIG. 13, the winding method of the upper curling portion 49 is made shallower. When the inner pot 3 is a “small pot”, the left side of FIG. As shown in FIG. 4, the winding of the upper curling portion 49 is deepened. That is, a difference of 2 mm (X ₁ −X ₂ = 2) is generated between the height dimensions X ₁ and X ₂ of the upper protective frame 8b. If it does in this way, the position of the upper end opening of the inner pot 3 with a low height dimension and the position of the upper end opening of the inner pot 3 with a high height dimension will only change the winding method of the upper curling part 49 in the upper protective frame 8b. Will match. Therefore, even if the inner pot 3 having a large dimensional variation in the height direction is adopted, the dimensional variation of the inner pot 3 can be absorbed with a small investment of attaching and detaching the spacer 47, and the upper end opening of the rice cooker body 1 and the lid 2. Can be secured.

  Since other configurations and operational effects are the same as those in the first and sixth embodiments, the description thereof is omitted.

Eighth Embodiment FIG. 14 shows a schematic configuration of main parts of an electric rice cooker according to an eighth embodiment of the present invention.

In this case, a rib 51 higher than the height Y ₁ of the support leg 3 a formed at the bottom of the inner pot 3 is integrally projected on the upper surface of the heat shield plate 11. I try to support it. If it does in this way, since the tolerance of the ceramic which comprises the heat insulation plate 11 is smaller than the tolerance of the inner pot 3, the distance of the bottom IH coil 15A and the bottom face of the inner pot 3 can be stabilized. Therefore, the output of the bottom IH coil 15A does not change due to the dimensional variation of the inner pot 3.

  Since other configurations and operational effects are the same as those in the first embodiment, the description thereof is omitted.

  The invention of the present application is not limited to the above-described embodiments, and it goes without saying that the design can be changed as appropriate without departing from the scope of the invention.

It is a longitudinal cross-sectional view of the electric rice cooker concerning 1st Embodiment of this invention. It is explanatory drawing explaining the selection standard of the inner pot in the electric rice cooker concerning 1st Embodiment of this invention. It is explanatory drawing explaining the selection reference | standard with the inner pot and rice cooker main body in the electric rice cooker concerning 1st Embodiment of this invention. The main part of the electric rice cooker concerning 2nd Embodiment of this invention is shown, (i) When an inner pot is a "normal pot", (b) is an inner pot being a "small pot", and mounting of packing When the way is not changed, (C) shows the case where the inner pot is a “small pot” and the packing is changed. The main part of the electric rice cooker concerning 3rd Embodiment of this invention is shown, (i) When an inner pot is a "normal pot", (b) is an inner pot is a "small pot", and a curved part coil die (C) shows a case where the inner pot is a “small pot” and the bending portion coil die is changed. The main part of the electric rice cooker concerning 4th Embodiment of this invention is shown, (i) When an inner pot is a "small pot", (b) When an inner pot is a "medium pot", (c) Indicates the case where the inner pot is a “large pot”. The main part of the electric rice cooker concerning 4th Embodiment of this invention is shown, (i) When an inner pot is a "small pot", (b) When an inner pot is a "medium pot", (c) Indicates the case where the inner pot is a “large pot”. The main part of the electric rice cooker concerning 4th Embodiment of this invention is shown, (i) When an inner pot is a "small pot", (b) When an inner pot is a "medium pot", (c) Indicates the case where the inner pot is a “large pot”. The principal part of the electric rice cooker concerning 5th Embodiment of this invention is shown, (i) shows the case where an inner pot is a "small pot", (b) shows the case where an inner pot is a "large pot". It is a longitudinal cross-sectional view of the electric rice cooker concerning 6th Embodiment of this invention. It is a principal part expanded sectional view at the time of using the spacer in the electric rice cooker concerning the 6th Embodiment of this invention. It is a principal part expanded sectional view at the time of using the spacer in the electric rice cooker concerning the 6th Embodiment of this invention. It is a longitudinal cross-sectional view of the electric rice cooker concerning 7th Embodiment of this invention. It is sectional drawing which shows the principal part of the electric rice cooker concerning 8th Embodiment of this invention.

Explanation of symbols

1 is a rice cooker body 2 is a lid 3 is an inner pot 9A is a bottom induction heating element 9B is a bending part induction heating element 15A is a bottom electromagnetic induction coil (bottom IH coil)
15B is bending part electromagnetic induction coil (bending part IH coil)

Claims (4)

A rice cooker body that detachably accommodates an inner pot made of a non-metallic material, a lid that covers the upper opening of the rice cooker body so as to be openable and closable, and an inner peripheral surface of the rice cooker body and the inner pot And a magnetic induction coil disposed on the outer surface of the bottom of the protective frame, and eddy currents are provided at positions facing the electromagnetic induction coil in the inner pot by the electromagnetic induction coil. An electric rice cooker having an induction heating element that generates a plurality of types of inner pots having different dimensional standards by sorting, and a plurality of types of rice cooker bodies adapted to these inner pots. An electric rice cooker characterized by being prepared in advance and selecting and combining the rice cooker body to be attached according to the size of the inner pot. As the electromagnetic induction coil, a bottom electromagnetic induction coil facing the bottom surface of the inner pot and a bending portion electromagnetic induction coil facing the bending portion from the bottom surface to the side surface of the inner pot are adopted, and the bending portion electromagnetic induction 2. The electric rice cooker according to claim 1, wherein the dimensions of the coil are configured to change in accordance with the dimension standard of the inner pot. 3. The electric rice cooker according to claim 2, wherein the size of the bottom electromagnetic induction coil is configured not to change depending on the size standard of the inner pot. The type of the inner pan is made into two types of sizes different in size in the radial direction, and an intermediate overlap part is provided between the two types of sizes as a reference to be sorted. The electric rice cooker as described in any one of 1, 2, and 3.

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