JP2007244648A - Electric rice cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a good matching between an internal pot and a rice cooker main body by absorbing the dimensional unevenness of the internal pot by a structure on the rice cooker main body side. <P>SOLUTION: This electric rice cooker is equipped with the rice cooker body 1 which freely detachably houses the internal pot 3 made of a non-metallic material, and bottom and curved section electromagnetic induction coil 15A and 15B which are arranged in a manner to correspond to the bottom surface of the internal pot 3, and a curved section located between the bottom surface and the side surface. In the electric rice cooker, bottom section and curved section induction heating elements 9A and 9B which respectively generate an eddy current by the bottom and curved section electromagnetic induction coils 15A and 15B are respectively arranged at positions corresponding to the bottom section in the internal pot 3 and the curved section electromagnetic induction coils 15A and 15B. At the same time, the width directional dimensions of the bottom and curved section induction heating elements 9A and 9B are set to be larger than the width directional dimensions of the respectively corresponding bottom and curved section electromagnetic induction coils 15A and 15B. Thus, the magnetic fields of the electromagnetic induction coils 15A and 15B are prevented from slipping from the induction heating elements 9A and 9B. <P>COPYRIGHT: (C)2007,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 or a ceramic 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. 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 electromagnetic induction coil on the rice cooker body side and the induction heating element on the inner pot side can make a difference. There is a risk of malfunction. However, the technique disclosed in Patent Document 1 does not mention this problem at all.
It is necessary to absorb the size variation of the inner pot with the structure of the rice cooker body.

  This invention is made | formed in view of said point, It is made to obtain favorable matching with an inner pot and a rice cooker main body by absorbing the dimension variation of an inner pot with the structure of the rice cooker main body side. The purpose is that.

  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, the lid body which opens and closes the upper opening of this rice cooker main body, The bottom part and curved part electromagnetic induction coil arranged corresponding to the curved surface located between the bottom surface and the bottom surface and the side surface of the inner pot constitute the inner peripheral surface of the rice cooker body and accommodate the inner pot An electric rice cooker provided with a protective frame that is sometimes supported, wherein the bottom and the curved portion electromagnetic induction coil respectively generate eddy currents at positions facing the bottom and the curved portion electromagnetic induction coil in the inner pot. And the width direction dimensions of the bottom portion and the bending portion induction heating element are set larger than the width direction dimensions of the corresponding bottom portion and the bending portion electromagnetic induction coil. To have.

  When the inner pot is accommodated in the rice cooker body due to the radial dimension variation of the inner pot due to the configuration as described above, it is difficult to accommodate the center of the inner pot and the center of the rice cooker body. However, since the widthwise dimension of the induction heating element is made larger than the widthwise dimension of the bottom and curved part electromagnetic induction coils, the magnetic field of the electromagnetic induction coil is not deviated from the induction heating element. As a result, even if the inner pot has dimensional variations, the heating variations can be suppressed as much as possible.

  In the present invention, as a second means for solving the above-mentioned problem, in the electric rice cooker provided with the above-mentioned first means, below the heat generated by the induction heating element at the inner bottom portion of the protective frame. A heat shield plate that blocks propagation to the upper surface and divides the protective frame into upper and lower parts, and an outer periphery of the heat shield plate, or (and) between the upper and lower protective frames, or (and) the upper part. Between the protective frame and the shoulder member constituting the shoulder portion of the rice cooker body, an elastic member provided on the outer peripheral surface of the inner pot when the inner pot is accommodated can be interposed, as such When configured, even if there is a variation in the radial dimension of the inner pot, it becomes possible to match the center of the inner pot with the center of the rice cooker body by the biasing force of the elastic member, the induction heating element and the electromagnetic induction coil Affects the matching distance It is eliminated.

  In the present invention, as a third means for solving the above problems, in the electric rice cooker provided with the first or second means, provided at the upper end portion of the inner pot on the inner surface of the lid. It is also possible to provide a flat surface that is pressed against when the lid seal packing is closed, and in such a case, the lid seal packing will not be affected even if the radial dimensions and height of the inner pan vary. It will always be press-contacted to a flat surface, and the sealing performance of a cover body and a rice cooker main body can be ensured.

  According to the 1st means of this invention, the rice cooker main body which detachably accommodates the inner pot which consists of nonmetallic materials, the cover body which opens and closes the upper opening of this rice cooker main body, and the bottom face and bottom face of the said inner pot A bottom portion and a curved portion electromagnetic induction coil arranged corresponding to the curved surface located between the side surface and the side surface, and a protective frame that constitutes the inner peripheral surface of the rice cooker body and supports the inner pan when housed In the electric rice cooker provided with a bottom portion and a bending portion induction heating element that generate eddy currents by the bottom portion and the bending portion electromagnetic induction coil, respectively, at positions facing the bottom portion and the bending portion electromagnetic induction coil in the inner pot. The width direction dimensions of the bottom portion and the bending portion induction heating element are set to be larger than the width direction size of the bottom portion and the bending portion electromagnetic induction coil corresponding to each of the bottom portion and the bending portion induction heating element. When the inner pot is accommodated in the rice cooker body by the key, even if it is difficult to accommodate the inner pot in the state where the center of the inner pot coincides with the center of the rice cooker body, the magnetic field of the electromagnetic induction coil Since there is no longer any deviation from the induction heating element, there is an effect that even if there is a dimensional variation in the inner pot, the variation in heating can be suppressed as much as possible.

  As in the second means of the present invention, in the electric rice cooker provided with the first means, a heat shield for blocking downward propagation of the heat generated by the induction heating element at the inner bottom portion of the protective frame. A plate is disposed and the protective frame is divided into two vertically, and the outer periphery of the heat shield plate, or (and) between the upper and lower protective frames, or (and) the upper protective frame and the rice cooker body Between the shoulder member constituting the shoulder portion, an elastic member provided on the outer peripheral surface of the inner pot when the inner pot is accommodated can be interposed. Even if there is variation in the directional dimensions, it is possible to match the center of the inner pot with the center of the rice cooker body by the biasing force of the elastic member, which affects the matching distance between the induction heating element and the electromagnetic induction coil Disappears.

  As in the third means of the present invention, in the electric rice cooker provided with the first or second means, the lid seal packing provided on the inner surface of the lid is closed at the upper end of the inner pot. It is also possible to provide a flat surface that is press-contacted at the time of the lid, and in such a case, the lid seal packing is always pressed against the flat surface even if the radial dimensions and height of the inner pan vary. Thus, the sealing property between the lid and the rice cooker body can be ensured.

  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 (half-sectional view) 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 7 so as to be removable.

  The inner pot 3 is made of a non-metallic material pot (for example, an earthen pot or a ceramic pot), and a bottom portion and a curved portion induction heat generation are formed on the bottom surface and the curved surface between the bottom surface and the side peripheral surface. Body (for example, silver paste etc.) 9A, 9B is 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, projecting support legs 3 a, 3 a, 3 a are integrally projected on the outer periphery of the bottom of the inner pot 3, and the support legs 3 a, 3 a, 3 a are placed on the heat shield plate 11. Thus, the inner pot 3 is supported in 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. Since the side heater 23 is greatly affected by the variation in the size of the inner pot 3, the energization rate is changed without changing the output of the side heater 23. For example, when the inner pan 3 is the largest in the range of variation, the inner pan 3 approaches the side heater 23, so the energization rate in the cooking process is 4/16, and the inner pan 3 has the smallest variation in the range of variation. Since the inner pot 3 is far from the side heater 23, the energization rate in the cooking process is 6/16.

  The protective frame 8 is vertically divided into two parts, and includes a lower protective frame 8a that holds the IH coils 15A and 15B and an upper protective frame 8b that holds the side heater 23.

  On the other hand, the lid body 2 is configured to have a space portion 19 of an upper plate 17 constituting an outer surface and a lower plate 18 constituting an inner surface, and discharges water vapor generated at the time of rice cooking to the center portion thereof. A steam discharge cylinder 10 is attached for the purpose. 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 mentioned above, although the pot (for example, earthen pot or ceramic pot etc.) which consists of nonmetallic materials is employ | adopted as the inner pot 3, in the case of such an inner pot 3, the height direction dimension is manufactured. In addition, a large variation in the radial dimension (for example, a variation of −1.5 mm to 2.0 mm) occurs.

Therefore, in the present embodiment, the width direction dimensions D ₁ and D ₂ of the bottom and bending portion induction heating elements 9A and 9B correspond to the width direction dimensions D of the bottom and bending portion IH coils 15A and 15B, respectively. _3, is set to be greater than D _4. If it does in this way, when the inner pot 3 is accommodated in the rice cooker body 1 due to the radial dimension variation of the inner pot 3, it is difficult to accommodate the center of the inner pot 3 and the center of the rice cooker body 3. Even if a case occurs, the magnetic fields of the IH coils 15A and 15B are not shifted from the induction heating elements 9A and 9B. Therefore, even if the dimensional variation of the inner pot 3 occurs, the heating variation can be suppressed as much as possible.

  In addition, elastic members 27 and 28 that are in contact with the outer peripheral surface (for example, the bottom surface) of the inner pot 3 when the inner pot 3 is accommodated are interposed in the inner and outer peripheral portions of the heat shield plate 11. In this case, the elastic member 27 on the inner peripheral side has a height that comes into contact with the bottom surface of the inner pot 3 before the support leg 3a of the inner pot 3 comes into contact with the upper surface of the heat shield plate 11. The elastic member 27 is brought into 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. While the variation can be suppressed as much as possible, the center of the inner pan 3 and the center of the rice cooker body 1 can be matched by the biasing force of the elastic member 28 even if the radial dimension of the inner pan 3 varies. Thus, the matching distance between the bending portion induction heating element 9B and the bending portion IH coil 15B is not affected. The elastic members 27 and 28 may be annular, but exhaust hot air that is trapped in the space between the bottom surface of the inner pot 3 and the upper surface of the heat shield plate 11 to a portion that contacts the inner pot 3. It is desirable to form a discharge port (not shown) for this purpose.

  Furthermore, in this embodiment, between the upper and lower protective frames 8a and 8b and between the upper protective frame 8a and the shoulder member 7, the outer peripheral surface of the inner pot 3 ( For example, elastic members 29 and 30 provided on the side circumferential surface) are interposed. 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 members 29, 30, and the curvature The matching distance between the part induction heating element 9B and the bending part IH coil 15B is not affected. The elastic members 29 and 30 are preferably annular in consideration of the hot air accumulation during cooking and the heat retaining properties, but the portion to be placed on the inner pot 3 may have a protruding shape with a predetermined interval.

  Note that all of the elastic members 27 to 30 may be used, but may be selected and used.

  Furthermore, in the present embodiment, the upper surface of the outer peripheral portion of the inner lid 21 is provided with a first flat surface 31 on which the first lid seal packing 25 is press-contacted when the lid is closed. A second flat surface 31 on which the second lid seal packing 26 is pressed when the lid body is closed is provided on the upper surface of the upper end portion (that is, the flange portion 3 c) of the pan 3. Here, the first and second flat surfaces 31 and 32 are made wider than the widths of the letter-shaped seal portions 25a and 26a in the first and second lid seal packings 25 and 26, respectively. The second flat surface 32 is a step portion formed on the inner peripheral side of the upper surface of the flange portion 3c, and an annular convex portion 34 is formed on the outer peripheral side for increasing the strength. . If it does in this way, even if the radial direction dimension and height main body dimension of inner pot 3 will vary, lid seal packing 25 and 26 will always be press-contacted to flat surfaces 31 and 32, and lid 2 and rice cooker The sealing property with the main body 1 can be ensured.

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

  In this case, an annular support leg 3a is integrally provided on the outer periphery of the bottom of the inner pot 3, and the support leg 3a is provided on the outer periphery of the bottom of the protective frame 8 at equal intervals in the circumferential direction. The inner pot 3 is housed and supported in the protective frame 8 by coming into contact with three support tables 35, 35, 35 (for example, silicon rubber). 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.

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

3rd Embodiment The electric rice cooker concerning the 3rd Embodiment of this invention is shown by FIG.

  In this case, the protective frame 8 is only the lower protective frame, and a peripheral wall portion 7 a extending from the inner peripheral edge of the shoulder member 7 to the upper end of the protective frame 8 is integrally projected. On the other hand, a bowl-shaped annular protrusion 36 is integrally projected on the vertical middle portion of the inner periphery of the inner pot 3, and by supporting the annular protrusion 36 against the upper end of the protective frame 8, The inner pot 3 is to be supported in the rice cooker body 1. In the present embodiment, the portion above the annular protrusion 36 is thin like the curved portion 3d. Further, a side surface IH coil 37 is disposed on the outer surface side of the peripheral wall portion 7 a instead of the side surface heater, while a side surface induction heating element 38 facing the side surface IH coil 37 is disposed on the inner surface of the inner pot 3. Is pasted. If it does in this way, since the inner pot 3 will be supported by the intermediate part in the up-down direction, the influence of the dimensional variation in the height direction of the inner pot 3 will be halved. Therefore, even if there is variation in the height direction dimension of the inner pot 3, the distance change between the bottom and bending portion induction heating elements 9A and 9B and the bottom and bending portion IH coils 15A and 15B can be suppressed within the error range. This makes it possible to suppress variations in heating as much as possible.

  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 semi-longitudinal sectional view of the electric rice cooker concerning a 1st embodiment of the invention in this application. It is sectional drawing which shows the principal part of the electric rice cooker concerning 2nd Embodiment of this invention. It is a half longitudinal cross-sectional view of the electric rice cooker concerning 3rd Embodiment of this invention.

Explanation of symbols

1 is a rice cooker body 2 is a lid 3 is an inner pot 7 is a shoulder member 8 is a protective frame 8a is a lower protective frame 8b is an upper protective frame 9A is a bottom induction heating element 9B is a bending part induction heating element 11 is a heat shield plate 15A Is the bottom electromagnetic induction coil (bottom IH coil)
15B is bending part electromagnetic induction coil (bending part IH coil)
25 and 26 are lid seal packings 27 to 30 are elastic members 31 and 32 are flat surfaces

Claims (3)

A rice cooker body that detachably accommodates an inner pan made of a non-metallic material, a lid that opens and closes the upper opening of the rice cooker body, and a curved surface positioned between the bottom surface and the bottom and side surfaces of the inner pan. An electric rice cooker comprising a bottom portion and a bending portion electromagnetic induction coil arranged correspondingly, and a protective frame that constitutes the inner peripheral surface of the rice cooker body and supports the inner pot when housed, At the position facing the bottom and the bending portion electromagnetic induction coil in the inner pot, a bottom portion and a bending portion induction heating element that respectively generate eddy currents by the bottom portion and the bending portion electromagnetic induction coil are disposed, respectively, An electric rice cooker characterized in that a width direction dimension of the bending portion induction heating element is set larger than a width direction dimension of the bottom portion and the bending portion electromagnetic induction coil corresponding to each. A heat shield plate for blocking the downward propagation of the heat generated by the induction heating element is disposed at the inner bottom of the protective frame, and the protective frame is divided into two parts, and the outer periphery of the heat shield plate. Or (and) between the upper and lower protective frames, or (and) between the upper protective frame and a shoulder member constituting the shoulder portion of the rice cooker body, The electric rice cooker according to claim 1, wherein an elastic member provided on the outer peripheral surface is interposed. The flat surface which the lid seal packing provided in the inner surface of the said cover body press-contacts at the time of lid closing is provided in the upper end part of the said inner pot. Electric rice cooker.

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