JP5655832B2 - rice cooker - Google Patents

Description

  The present invention relates to an induction heating rice cooker using a non-metal pan, and relates to a heat-resistant structure at the bottom of the inner case that houses the non-metal pan.

  At present, induction heating rice cookers using non-metal pots, for example, earthen pots, are already known. And this rice cooker, like a conventional metal pan, a water absorption process in which rice and the like absorb water, a cooking process in which the heating temperature rises rapidly, a boiling maintenance process in which the heating temperature is maintained at approximately 100 ° C., and unevenness after the completion of cooking It has been considered to control the heat retention process for maintaining cooked rice and the like cooked for a long time after the process and the uneven process.

  An induction heating method is used for the heating control. This induction heating method heats the metal provided at the bottom of the earthenware pot by electromagnetic induction with the work coil installed in the main body, cooks rice rice etc. in the earthenware pot using that heat, and at the time of heat retention, a heat sink with a heater Is also used to keep the rice and rice in the earthen pot uniformly from the surroundings, and to prevent partial condensation due to temperature unevenness etc. and to perform optimal heat insulation control, cook rice rice etc. deliciously and for a long time It is possible to keep warm.

  FIG. 7 shows an example of an induction heating rice cooker using a clay pot that the applicant has already proposed. The induction heating rice cooker a includes an inner case b that is disposed in a container body (not shown) that forms an outer shell, a lid member (not shown) that closes an upper opening of the container body, and the like. The curved side portion has a work coil c as a heating means. A clay pot d made of a magnetic material is detachably accommodated in the inner case b. A metal e such as iron or stainless steel is bonded to the bottom of the earthenware pot d, the metal e is heated by electromagnetic induction, and the contents in the earthenware pot d are heated by the heat (for example, Patent Documents). 1).

  By the way, since the earthenware pot d has extremely low thermal conductivity and does not generate heat, only the portion where the metal e is bonded is heated in the case where the metal e is bonded to the bottom portion and the curved side portion facing the work coil c as in the prior art. Is done. If there is water in the earthenware pot d, the internal temperature is almost uniformed by the convection of the water, so there is no particular problem. However, if there is no water and only the rice and the like are used, uniform heating will not be performed and a problem will occur. . However, such a problem can be prevented by providing heating means on the side of the clay pot.

  However, in the case where metal is bonded to the bottom and the curved side facing the work coil c as in the prior art, the heat generated by the metal e is transmitted to the inner case b by radiation, and in some cases, the position facing the metal e. It has been found that the temperature of the inner case b becomes abnormally high and may adversely affect not only the inner case b itself but also the members outside the inner case b and control parts and other electrical components. . Specifically, the conventional inner case b uses a PET resin having a normal heat resistance temperature of about 150 ° C., and is more expensive than PET and has a high heat resistance temperature (about 250 ° C.) in a portion requiring higher heat resistance. PPS resin was used, and it was thought that there was no problem in heat resistance. However, it has been found that depending on the material and shape of the earthenware pot, the heating output, etc., the temperature of the inner case b becomes about 250 ° C. or more due to radiant heat, and it may not be possible to use even an expensive PPS resin.

JP 2005-304709 A

  The object of the present invention is to solve such a conventional problem, and more specifically, a heat-resistant member comprising a ceramic plate made of crystallized glass ceramics on the upper surface of the bottom of the inner case, which is also a protective frame of a rice cooker. And protecting the inner case etc. from the radiant heat from the heat generating member provided at the bottom of the non-metallic pan, and heating the earthen pot almost evenly.

  In order to achieve the above object, the present invention adopts the following configuration.

In the invention according to claim 1, an inner case forming an inner wall, a container body forming an outer wall, a lid member that can be opened and closed with respect to the container body, and induction heating provided between the inner case and the container body In the rice cooker having a heating pot of the type and a clay pot stored in the inner case,
The bottom of the earthenware pot has a leg, and the heating means has a bottom coil that faces the bottom of the earthenware pot and a side coil that faces the curved part of the earthenware pot, and is on the top of the bottom of the inner case. When the heat-resistant member is attached at a position facing the bottom coil and the earthenware pot is housed in the inner case, the legs are located on the outer side of the heat-resistant member or on the upper surface of the heat-resistant member, and the bottom of the earthenware pot And a space between the heat-resistant member, the space between the bottom of the earthenware pot and the bottom coil, the space, the heat-resistant member and the inner case are interposed in order from the top, the space communicates with the outside, A configuration in which, when the heating means is heated, the air heated in the gap is moved up by natural convection to heat the outer portion of the clay pot.

  In the invention which concerns on Claim 1, it is a bottom upper surface of an inner case, Comprising: A heat-resistant member is attached with a space | gap between a clay pot bottom part in the position facing a bottom coil, A space | gap is connected outside, A heating means When heating the air, the air heated in the gap is moved upward by convection to heat the outer part of the earthenware pot, so that not only the inner case itself but also the outer parts of the inner case and electrical components such as control elements The adverse effect of heat can be prevented, and the reliability and safety of a rice cooker using a non-metal pan can be improved. In addition, since the material of the inner case can be an inexpensive PET resin as in the prior art, the production cost can be reduced. Furthermore, the clay pot can be heated almost evenly.

Whole sectional view of a rice cooker formed by applying the earthenware pot of the present invention Partially enlarged sectional view of FIG. Partially enlarged sectional view of another rice cooker to which the earthenware pot of the present invention is applied Partially enlarged sectional view of still another rice cooker to which the earthenware pot of the present invention is applied Partially enlarged sectional view of still another rice cooker to which the earthenware pot of the present invention is applied Partially enlarged sectional view of still another rice cooker to which the earthenware pot of the present invention is applied Schematic cross-sectional view of a rice cooker using a conventional clay pot

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 shows a sectional view of the whole rice cooker to which the heat-resistant member of the present invention is attached, and FIG. 2 shows a partially enlarged sectional view thereof. The rice cooker 1 is roughly divided into a container main body 2 in which a clay pot 4 that is a non-metal pot is stored, and a lid member 3 that can freely open and close the upper opening of the container main body 2. The lid member 3 is a resin member made of PP or the like, and includes an upper lid 5, a lower lid 6, a radiator plate 7, an inner cover 8, and the like.

  A pressure regulating lid 9 is provided at the center of the lid member 3, and when the internal pressure rises to a predetermined level or higher, the internal vapor is discharged to the outside through the vapor passage 10 formed in the pressure regulating lid 9. To do. Further, a hinge mechanism (not shown) that already contains a known spring material is provided on the rear side of the lid member 3 (perpendicular to the plane of FIG. 1). The lid member 3 can be freely opened and closed with respect to the container body 2 by a locking or unlocking action of a locking member (not shown) provided in the container.

  The container body 2 includes an outer case 12 that forms an outer wall, an inner case 13 that is in the outer case 12 and is also a protective frame that forms an inner wall, a shoulder member 14 that forms the upper end of the inner and outer cases 12 and 13, and It consists of the bottom member 15 which forms the bottom part of the rice cooker 1. The outer case 12 is made of a metal such as stainless steel and is a cylindrical member having an upper and lower opening, and forms a body portion of the rice cooker 1. The outer case 12 may be made of resin instead of metal.

  The shoulder member 14 is made of resin, such as PP, and forms an upper end portion of the container body 2, and a hinge mechanism and a handle 16 are provided on the rear side and the outer peripheral side thereof, respectively. The inner case 13 forming the inside of the container body 2 is a bottomed cylindrical dish member having substantially the same shape as a clay pot 4 described later, and its height is substantially half that of the clay pot 4. The upper case 17 made of metal and made of stainless steel, for example, is attached so as to be sandwiched between the shoulder member 14 and the inner case 13. The attachment is performed by fastening the shoulder member 14 and the inner case 13 with screws (not shown).

  The bottom member 15 that forms the bottom of the rice cooker 1 is a resin member made of PP or the like, like the inner case 13, and is attached to the inner case 13 or the like by screws (not shown). The bottom member 15 constitutes a bottom shell of the rice cooker 1, and a cooling air intake port (not shown) is provided in front of the bottom member 15 and a cooling air exhaust port (not shown) is provided behind the bottom member 15.

  Reference numeral 18 denotes a temperature sensor, which is pressed by the clay pot 4 when the clay pot 4 is stored in the inner case 13. Then, the temperature sensor 18 energizes the control circuit and enables heating control of the rice cooker 1. The temperature sensor 18 is a known sensor and includes a reed switch that detects the set state of the earthenware pot 4 and a thermistor that detects the temperature of the earthenware pot 4.

  A bottom coil 19 and a side coil 20, which are heating means for performing induction heating, are disposed on the bottom surface of the inner case 13 and the curved part (including the side part near the curved part), respectively. The bottom coil 19 and the side coil 20 are fixed by a coil base 25. The bottom coil 19 and the side coil 20 are formed by concentrically winding a copper wire a required number of times in series and arranged in the center and the outer periphery, and the bottom coil 19 faces the bottom of the earthenware pot 4, The side coil 20 is disposed so as to face the curved portion of the earthenware pot 4 and the side portion in the vicinity thereof.

  In the front space of the rice cooker 1 (vertical direction in FIG. 1), an operation board on which various switch buttons and a display device are arranged, and a control board on which various electronic circuit elements such as IGBTs are attached are provided. Cooking rice such as cooked rice and keeping warm.

  In the upper case 17 attached to the upper part of the inner case 13 and the inner case 13, a clay pot 4 for cooking rice and the like is storably disposed. The earthenware pot 4 is a bottomed cylindrical member formed of ceramics including porcelain, ceramics, industrial ceramics, etc., and has a substantially flat bottom part 4a, a curved part 4b following the bottom part 4a, and a curved part 4b. A ring-shaped leg 4d that protrudes slightly downward is formed at the boundary between the bottom portion 4a and the curved portion 4b, and a flange 4e that protrudes in the outer peripheral direction is formed at the upper end of the cylindrical portion 4c. Is done.

  Further, on the surface of the bottom 4a of the earthenware pot 4 and the curved portion 4b facing the bottom coil 19 and the side coil 20, a metal and a heat generating member as shown in FIG. A membrane 21 is attached. The silver film 21 is provided on almost the entire lower surface of the bottom portion 4a and the lower surface of the curved portion 4b facing the side coil 20, and the upper surface of the silver film 21 is further covered with glaze. The silver film 21 is protected by covering with glaze.

  Instead of the silver film 21, another metal, for example, a thin plate member such as iron or magnetic stainless steel (SUS430) can be used. By attaching the silver film 21 to almost the entire lower surface of the bottom 4a of the earthenware pot 4, the tip of the temperature sensor 18 comes into contact with the silver film 21, and the heat generation temperature of the silver film 21 can be detected. Rice cooker control can be performed.

  The inner case 13 is a bottomed cylindrical dish member having substantially the same shape as the clay pot 4 as described above, and the height thereof is approximately half the height of the clay pot 4. A metal upper case 17 is attached, and the members 13 and 17 accommodate almost the entire earthenware pot 4 inside. The upper case 17 may be made of resin, or the inner case 13 and the upper case 17 may be integrated to form one inner case.

  The inner case 13 is a resin member made of PET, and includes a substantially flat bottom portion 13a and a curved portion 13b following the bottom portion 13a, like the clay pot 4, and protrudes in the outer circumferential direction at the upper end of the curved portion 13b. A receiving portion 13c having an L-shaped cross section is formed, and the lower end of the upper case 17 abuts on the receiving portion 13c. The inner case 13 may be an expensive and high heat resistance PPS resin instead of the PET resin.

  On the upper surface of the bottom 13a of the inner case 13, a ring-shaped rib 22 having a diameter smaller than the outer diameter of the bottom 13a is provided. Further, in the planar doughnut-shaped region between the rib 22 and the boundary between the bottom portion 13a and the curved portion 13b, three rectangular grooves 23 having substantially the same shape are spaced downward at substantially equal intervals (120 degrees). Provided in a recessed form. A rectangular silicon rubber packing 24 that is a heat-resistant elastic member is press-fitted into the square groove 23. That is, the silicon rubber packing 24 is attached to the outside of the rib 22 in a form using the rib 22 as a wall portion. The diameter of the circle drawn by the centers of the three rectangular grooves 23 is substantially the same as the diameter of the center of the leg 4d of the earthenware pot 4. When the earthenware pot 4 is stored in the inner case 13, the leg 4d has three silicons. Place on rubber packing 24.

  In the induction heating, the distance between the coils 19 and 20 and the silver film 21 as the heat generating member needs to be constant at all times, but the earthenware pot 4 has a variation in size due to reasons such as baking at high heat. If the flange 4e is used, the distance between the coils 19 and 20 and the silver film 21 varies. In this example, the earthenware pot 4 is supported by the legs 4d, and the distance between the coils 19, 20 and the silver film 21 can be made constant at all times. Induction heating involves vibration, but by supporting the earthenware pot 4 with the silicon rubber packing 24, vibration of the earthenware pot 4 can be prevented and generation of noise associated with the vibration can also be prevented. Furthermore, the harmful effect of the earthenware pot 4 being applied or broken can be prevented.

  Reference numeral 30 denotes a ceramic plate made of crystallized glass, which is a heat-resistant member. The ceramic plate 30 is a disk-like member having a thickness of about 3 mm and having a hole 30a through which the temperature sensor 18 can penetrate. The outer diameter of the ceramic plate 30 is slightly smaller than the diameter of the ribs 22 formed on the upper surface of the bottom portion 13a of the inner case 13, and is placed in the ribs 22 on the upper surface of the bottom portion 13a. The rib 22 is bonded to the upper surface of the bottom 13a. It should be noted that an adhesive margin having a depth of approximately 0.3 to 0.5 mm is provided circumferentially or radially on the upper surface of the bottom 13a of the inner case 13 to which the ceramic plate 30 is bonded. By providing such a bonding margin as an adhesive reservoir, the bonding effect between the ceramic plate 30 and the inner case 13 can be enhanced. In addition, by providing the rib 22 described above, a ring-shaped recess 49 is formed between the outer peripheral end of the bottom portion 13 a of the inner case 13 and the rib 22. Then, by using the concave portion 49 as a reservoir, it is possible to retain and store the spring that flows down along the outer peripheral surface of the earthenware pot 4 in the event of a spill, and to connect the ceramic plate 30 and the temperature sensor 18. Adhesion can be prevented.

  Further, during bonding, a slight gap s is provided between the outer peripheral surface of the ceramic plate 30 and the inner peripheral surface of the rib 22 as shown in FIG. By providing the gap s, the protruding adhesive can be retained in the gap s when the ceramic plate 30 is bonded, and the adverse effect of the protruding adhesive flowing out of the rib 22 can be prevented. In addition, by forming the plate 30 that is a heat-resistant member using a member that absorbs water, the heat generated by the heat-resistant plate 30 may be prevented from leaking to the inside of the main body.

  By adhering the ceramic plate 30 to the upper surface of the bottom portion 13 a of the inner case 13, the ceramic plate 30 faces the bottom surface of the earthenware pot 4 and also faces the bottom coil 19. As a result, the silver coil 21 that is a heat generating member generates heat as high as about 250 to 300 ° C. by the bottom coil 19, but this high temperature radiant heat is shielded by the ceramic plate 30. Therefore, the adverse effect that the surface of the bottom portion 13a of the inner case 13 or the member below the inner case 13 becomes high temperature is prevented.

  Since the inner case 13 itself has a heat insulating property, by adhering the ceramic plate 30 to the upper surface of the bottom portion 13 a of the inner case 13, a double heat insulating structure is formed at the bottom of the inner case 13. The thermal effect is further reduced. Further, the cost can be reduced by using the ceramic plate 30 only in a portion facing the silver film 21 which is a heat generating member. The silicon rubber packing 24 is also a heat-resistant member. In this example, the silicon rubber packing 24 as the second heat-resistant member is provided on the outer periphery of the ceramic plate 30 as the first heat-resistant member. The influence of heat on the lower side of the packing 24 is also prevented.

  When the earthenware pot 4 is stored in the inner case 13 to which the ceramic plate 30 is bonded, the legs 4d of the earthenware pot 4 are placed on the silicon rubber packing 24, and between the lower surface of the bottom 4a of the earthenware pot 4 and the upper surface of the ceramic plate 30 is about 2 mm. The void 31 is formed. Therefore, the air heated in this space | gap 31 moves up along the outer peripheral surface of the earthenware pot 4 as shown by the arrow by a convection, and heats the earthenware pot 4 from an outer side part. Therefore, local heating due to heat trapping in the gap 31 is prevented, and heating close to uniform heating is performed, and rice cooking efficiency and the like are improved accordingly. By providing the gap 31 as described above, a triple heat insulation structure is formed by the gap 31, the heat-resistant member 30 and the inner case bottom 13a, so that heat is held on the pan side and heat is transferred to the outside of the inner case bottom 13a. Migration can be reduced.

  In this embodiment, in consideration of cost effectiveness, the ceramic plate 30 is provided only on the surface of the inner case 13 facing the bottom coil 19 that generates a large output with strong magnetic force, but the inner case 13 facing the side coil 20 is provided. A ceramic plate 30 may also be provided on the surface. In that case, it will form in a ring shape.

  FIG. 3 shows a modification. In this example, a clay pot is placed on a ceramic plate and silicon rubber packing is not required. 1 and 2 are denoted by the same reference numerals, and detailed description thereof is omitted.

  The earthenware pot 4 is the same as that shown in FIGS. 1 and 2, and the surface of the bottom part 4a and the curved part 4b facing the bottom coil 19 and the side coil 20 has a thickness of about 10 to several tens of microns as a heating member. The silver film 21 is attached, and the upper surface of the silver film 21 is covered with glaze.

  The inner case 13 is a resin member made of PET, and includes a substantially flat bottom portion 13a and a curved portion 13b following the bottom portion 13a, like the clay pot 4, and protrudes in the outer circumferential direction at the upper end of the curved portion 13b. A receiving portion 13c having an L-shaped cross section is formed, and the lower end of the upper case 17 abuts on the receiving portion 13c. The entire upper surface of the bottom 13a of the inner case 13 is horizontal.

  The ceramic plate 30 made of crystallized glass, which is a heat-resistant member, is a disk-shaped member having a thickness of about 3 mm having a hole 30a through which the temperature sensor 18 can pass in the center, and its outer diameter is that of the bottom 13a of the inner case 13. It is slightly smaller than the diameter and is the same as or slightly larger than the outer diameter of the leg 4d of the earthenware pot 4, and is placed on the upper surface of the bottom portion 13a of the inner case 13 and bonded to the upper surface of the bottom portion 13a with a silicon-based adhesive. Note that a bonding margin of a depth of approximately 0.3 to 0.5 mm is provided circumferentially or radially on the upper surface of the bottom 13a of the inner case 13 to which the ceramic plate 30 is bonded.

  When the earthenware pot 4 is stored in the inner case 13 to which the ceramic plate 30 is bonded, the legs 4d of the earthenware pot 4 are placed on the upper surface in the vicinity of the outer periphery of the ceramic plate 30 and between the lower surface of the bottom 4a of the earthenware pot 4 and the upper surface of the ceramic plate 30. Forms a gap 31 of about 2 mm. In this case, if the leg 4d of the earthenware pot 4 is ring-shaped, the gap 31 becomes a sealed space, and the temperature may rise abnormally. In such a case, the ring-shaped leg 4d is divided into a plurality of pieces, and an opening communicating with the outside is formed between them, so that the air heated in the gap 31 is changed from that shown in FIGS. Similarly, the earthenware pot 4 may be moved up along the outer surface of the earthenware pot 4 to heat the earthenware pot 4 from the outside.

  In this example, as in the case of FIGS. 1 and 2, it is possible to prevent the influence of heat on the inner case 13 and the like, and it is possible to eliminate the need for the silicon rubber packing. Further, since the earthenware pot 4 is placed on the upper surface of the hard ceramic plate 30, the distance between the coil and the heating member at the bottom of the earthenware pot can be made more constant than that placed on the silicon rubber packing which is the elastic body of FIGS. The heat generation efficiency is improved accordingly.

  FIG. 4 shows a further modification of FIG. In this example, the silicon rubber packing for placing the earthen pot on the ceramic plate is not required, and the bonding process of the ceramic plate can be performed in a short time. 1 and 2 are denoted by the same reference numerals, and detailed description thereof is omitted.

  The earthenware pot 4 is the same as that shown in FIGS. 1 and 2, and the surface of the bottom part 4a and the curved part 4b facing the bottom coil 19 and the side coil 20 has a thickness of about 10 to several tens of microns as a heating member. The silver film 21 is attached, and the upper surface of the silver film 21 is covered with glaze.

  The inner case 13 is a resin member made of PET, and includes a substantially flat bottom portion 13a and a curved portion 13b following the bottom portion 13a, like the clay pot 4, and protrudes in the outer circumferential direction at the upper end of the curved portion 13b. A receiving portion 13c having an L-shaped cross section is formed, and the lower end of the upper case 17 abuts on the receiving portion 13c. The entire upper surface of the bottom 13a of the inner case 13 is horizontal.

  The ceramic plate 30 made of crystallized glass, which is a heat-resistant member, is a disk-shaped member having a thickness of about 3 mm having a hole 30a through which the temperature sensor 18 can pass in the center, and its outer diameter is that of the bottom 13a of the inner case 13. It is smaller than the diameter and larger than the outer diameter of the leg 4d of the earthenware pot 4, is placed on the upper surface of the bottom portion 13a of the inner case 13, and is bonded to the upper surface of the bottom portion 13a with a silicon-based adhesive. Note that a bonding margin of a depth of approximately 0.3 to 0.5 mm is provided circumferentially or radially on the upper surface of the bottom 13a of the inner case 13 to which the ceramic plate 30 is bonded.

  When the earthenware pot 4 is stored in the inner case 13 to which the ceramic plate 30 is bonded, the legs 4d of the earthenware pot 4 are placed on the upper surface in the vicinity of the outer periphery of the ceramic plate 30 and between the lower surface of the bottom 4a of the earthenware pot 4 and the upper surface of the ceramic plate 30. Forms a gap 31 of about 2 mm. In this case, if the leg 4d of the earthenware pot 4 is ring-shaped, the gap 31 becomes a sealed space, and the temperature may rise abnormally. In such a case, the ring-shaped leg 4d is divided into a plurality of pieces, and an opening communicating with the outside is formed between them, so that the air heated in the gap 31 is changed from that shown in FIGS. Similarly, the earthenware pot 4 may be moved up along the outer peripheral surface of the earthenware pot 4 to heat the earthenware pot 4 from the outside.

  By the way, when the ceramic plate 30 is bonded to the upper surface of the bottom 13a of the inner case 13 with a silicon-based adhesive, it takes approximately one day for the adhesive to solidify, and it is necessary to bond it in advance. This requires a separate work place, resulting in poor work efficiency.

  This example eliminates such a harmful effect. A plurality of, for example, three, holes 35 penetrating vertically are provided at the outer peripheral end of the bottom 13a of the inner case 13 at equal intervals. Also, a metal or resin plate retainer 36 having locking pieces 37, 37 extending in the opposite direction at the upper and lower ends is prepared, the plate retainer 36 is inserted into the hole 35, and the upper and lower ends in the opposite direction. The extending locking pieces 37, 37 hold the bottom surface of the bottom portion 13 a of the inner case 13 and the upper end surface of the ceramic plate 30.

  That is, an adhesive is applied to the upper surface of the bottom 13a of the inner case 13, and the ceramic plate 30 is placed. Thereafter, a plate presser 36 is press-fitted into the hole 35 from above, and the upper end surface of the ceramic plate 30 is held between the upper end locking pieces 37, and the lower end locking piece 37 is placed on the lower surface of the bottom portion 13 a of the inner case 13. The ceramic plate 30 is fixed by forcibly fitting. Then assemble it as it is. By doing in this way, the process of adhering beforehand becomes unnecessary, an assembly process can be performed immediately after an adhesion process, and work efficiency and production cost can be reduced significantly.

  In this example as well, the thermal effect on the inner case 13 and the like can be prevented as in the case of FIGS. 1 and 2, and the silicon rubber packing can be made unnecessary, so that the cost is reduced accordingly. In addition, since the earthenware pot 4 is placed on the upper surface of the hard ceramic plate 30, the distance between the coil and the heating member at the bottom of the earthenware pot is made more constant than that placed on the silicon rubber packing which is the elastic body of FIGS. Heat generation efficiency is improved accordingly.

  FIG. 5 shows a further modification of FIG. In this example, as in FIG. 4, the silicon rubber packing for placing a clay pot on the ceramic plate is not necessary, and the bonding process of the ceramic plate can be performed in a short time. 1 and 2 are denoted by the same reference numerals, and detailed description thereof is omitted.

  The earthenware pan 4 is the same as that shown in FIGS. 1 and 2 except that the legs 4d are omitted. The bottom 4a and the surface of the curved portion 4b facing the bottom coil 19 and the side coil 20 are made of heat generating members. A silver film 21 having a thickness of about 10 to several tens of microns is attached, and the upper surface of the silver film 21 is covered with a glaze.

  The inner case 13 is a resin member made of PET, and includes a substantially flat bottom portion 13a and a curved portion 13b following the bottom portion 13a, like the clay pot 4, and protrudes in the outer circumferential direction at the upper end of the curved portion 13b. A receiving portion 13c having an L-shaped cross section is formed, and the lower end of the upper case 17 abuts on the receiving portion 13c.

  The ceramic plate 30 made of crystallized glass, which is a heat-resistant member, is a disk-shaped member having a thickness of about 3 mm having a hole 30a through which the temperature sensor 18 can pass in the center, and its outer diameter is that of the bottom 13a of the inner case 13. It is slightly smaller than the diameter and is the same as or slightly larger than the outer diameter of the bottom 4a of the earthenware pot 4. Further, a plurality of, for example, three holes 38 penetrating in the vertical direction are provided in the vicinity of the outer peripheral end. . And it mounts on the upper surface of the bottom part 13a of the inner case 13, and adhere | attaches on the upper surface of the bottom part 13a with a silicon-type adhesive agent. The bottom 13a of the inner case 13 where the hole 38 of the ceramic plate 30 is located is provided with a plurality of, for example, three holes 39 having the same diameter as the hole 38 and penetrating in the vertical direction. After mounting on the bottom 13a of the thirteen, the hole 38 and the hole 39 are arranged in a vertically penetrating state.

  Then, an elastic member 40 made of rubber or the like that sandwiches the ceramic plate 30 and the bottom portion 13 a of the inner case 13 is press-fitted between the hole 38 and the hole 39. The elastic member 40 has umbrella portions 40 a and 40 a at the top and bottom, and the ceramic plate 30 and the bottom portion 13 a of the inner case 13 are held between the umbrella portions 40 a and 40 a. That is, after placing the ceramic plate 30 on the bottom 13a of the inner case 13 with the hole 38 and the hole 39 penetrating vertically, the elastic member 40 is press-fitted from above. Then, one umbrella part 40a protrudes to the opposite side through the hole 38 and the hole 39, deform | transforming, and the umbrella part 40a is latched by the lower surface of the inner case 13 bottom part 13a. As a result, the elastic member 40 sandwiches the ceramic plate 30 and the bottom portion 13a of the inner case 13 with both umbrella portions 40a and 40a.

   In the form in which the ceramic plate 30 and the bottom portion 13a of the inner case 13 are sandwiched by the two umbrella portions 40a, 40a, the upper umbrella portion 40a protrudes above the ceramic plate 30, and the top of the earthenware pot 4 is formed on the upper surface thereof. The bottom portion 4a is placed with a gap 31 of about 2 mm between the bottom surface of the bottom portion 4a of the clay pot 4 and the top surface of the ceramic plate 30. By doing so, the distance between the coil and the heating member at the bottom of the earthenware pot can be made more constant, so that the heat generation efficiency is improved accordingly, and the umbrella part 40a is an elastic body so that the earthenware pot 4 can be accommodated when the earthenware pot 4 is stored. An impact is applied and harmful effects such as breakage are prevented.

  In this example as well, since the gap 31 is open to the outside, the air heated in the gap 31 moves upward along the outer peripheral surface of the earthenware pot 4 as indicated by the arrow, and the earthenware pot 4 Is heated from the outside. Also in this example, since the ceramic plate 30 and the bottom portion 13a of the inner case 13 can be assembled immediately after being sandwiched by the elastic member 40, the production cost can be greatly reduced. Further, as in the case of FIGS. 1 and 2, the thermal effect on the inner case 13 and the like can be prevented, and the elastic member 40 can be used instead of the silicon rubber packing 24, so that the cost is reduced accordingly.

  In this example, the second elastic member 41 is provided at the lower end or the upper end of the upper case 17. FIG. 5 shows the second elastic member 41 held between the lower end of the upper case 17 and the receiving portion 13 c of the inner case 13. The second elastic member 41 is an elastic member such as rubber having an L-shaped cross section having a horizontal portion 41a and a vertical portion 41b, and a plurality of, for example, three are provided at equal intervals on the circumference.

  The horizontal portion 41a protrudes inward, and when the earthenware pot 4 is accommodated in the inner case 13, the outer periphery of the earthenware pot 4 is accommodated while being in contact with the horizontal part 41a. That is, the horizontal part 41a has a positioning function while mitigating the impact on the earthenware pot 4 when the earthenware pot 4 is stored, and further prevents the earthenware pot 4 from being displaced from the center.

  FIG. 6 shows a further modification. This example is an earthenware pot having the advantages of FIG. 3 (stabilization of the distance between the silver film and the upper surface of the inner case bottom) and FIG. 5 (preventing vibration and breakage when storing the earthenware pot). The present invention relates to mounting means. 1 and 2 are denoted by the same reference numerals, and detailed description thereof is omitted.

  The earthenware pot 4 has legs 4d, and a silver film 21 having a thickness of about 10 to several tens of microns, which is a heat generating member, is formed on the surface of the bottom 4a and the curved portion 4b facing the bottom coil 19 and the side coil 20. In addition, the upper surface of the silver film 21 is covered with glaze.

  The inner case 13 is a resin member made of PET, and includes a substantially flat bottom portion 13a and a curved portion 13b following the bottom portion 13a, like the clay pot 4, and protrudes in the outer circumferential direction at the upper end of the curved portion 13b. A receiving portion 13c having an L-shaped cross section is formed, and the lower end of the upper case 17 abuts on the receiving portion 13c. Further, a stepped portion 46 into which an inner rubber packing 45 described later can be fitted is formed at the inner peripheral end of the central opening 13d provided in the center of the inner case 13 and through which the temperature sensor 18 passes, and the outer end portion of the bottom portion 13a. A fitting groove 48 into which an outer rubber packing 47 to be described later can be fitted is formed on the upper surface.

  The inner rubber packing 45 is a heat-resistant member such as silicon rubber, and is formed in a ring shape and is formed with a concave portion 45a having a U-shaped cross section on the outer peripheral side thereof. It attaches in the form which inserts the recessed part 45a of the inner side rubber packing 45 in the step part 46 formed in the inner peripheral end. In the attached state, the upper surface of the inner rubber packing 45 has a horizontal portion 45b, and the horizontal surface of the bottom of the clay pot 4 is placed on the horizontal portion 45b.

  A ceramic plate 30 made of crystallized glass, which is a heat-resistant member, has a disk shape with a thickness of about 3 mm having a hole 30a having a larger diameter than that of FIGS. 1 and 2 through which the temperature sensor 18 and the inner rubber packing 45 can penetrate. The outer diameter of the member is smaller than the diameter of the bottom 13 a of the inner case 13 and larger than the outer diameter of the legs 4 d of the earthenware pot 4. Then, it is placed on the upper surface of the bottom portion 13a of the inner case 13, and is bonded to the upper surface of the bottom portion 13a with a silicon-based adhesive.

  The outer rubber packing 47 is attached to the outer peripheral end of the ceramic plate 30 before the ceramic plate 30 is bonded to the upper surface of the bottom portion 13a of the inner case 13. This outer rubber packing 47 is a heat-resistant member such as silicon rubber like the inner rubber packing 45, and the entire outer rubber packing 47 is ring-shaped and a concave portion 47a having a U-shaped cross section is formed on the inner peripheral side thereof. The recessed portion 47a is fitted into the outer peripheral end of the ceramic plate 30. In the attached state, the outer rubber packing 47 has an inclined portion 47b on the upper surface, and the curved side surface of the clay pot 4 is placed on the inclined portion 47b.

  When the earthenware pot 4 is stored in the inner case 13, the horizontal surface of the earthenware pot 4 bottom 4 a is placed on the horizontal part 45 b of the upper surface of the inner rubber packing 45, and the curved side surface of the earthenware pot 4 is on the inclined part 47 b of the upper surface of the outer rubber packing 47. While being placed, the legs 4 d of the earthenware pot 4 are brought into contact with or substantially in contact with the upper surface of the ceramic plate 30. Therefore, the inner rubber packing 45 and the outer rubber packing 47 prevent harmful effects such as damage of the earthenware pot 4 due to vibration or the like when the earthenware pot 4 is stored, and the legs 4d of the earthenware pot 4 are disposed on the upper surface of the ceramic plate 30. Since it is almost in contact, the distance between the coil and the heating member at the bottom of the clay pot can be made constant, and the heat generation efficiency is improved accordingly.

  In this example, the second elastic member 41 is provided at the lower end or the upper end of the upper case 17 in the same manner as in FIG. 6 also shows the second elastic member 41 held between the lower end of the upper case 17 and the receiving portion 13c of the inner case 13. FIG. The second elastic member 41 is an elastic member such as rubber having an L-shaped cross section having a horizontal portion 41a and a vertical portion 41b, and a plurality of, for example, three are provided at equal intervals on the circumference.

  The horizontal portion 41a protrudes inward, and when the earthenware pot 4 is accommodated in the inner case 13, the outer periphery of the earthenware pot 4 is accommodated while being in contact with the horizontal part 41a. That is, the horizontal part 41a has a positioning function while mitigating the impact on the earthenware pot 4 when the earthenware pot 4 is stored, and further prevents the earthenware pot 4 from being displaced from the center.

  The invention of the present application is not limited to the configuration of the above embodiment, and it is needless to say that the design can be appropriately changed without departing from the gist of the invention.

DESCRIPTION OF SYMBOLS 1 ... Rice cooker 2 ... Container main body 3 ... Lid member 4 ... Earthen pot 4a ... Bottom part 4b ... Curved part 4c ... Cylindrical part 4d ... Leg 4e ... Flange 5 ... Upper lid 6 ... Lower lid 7 ... Heat sink 8 ... Inner cover 9 ... Pressure adjusting lid 10 ... Steam passage 11 ... Steam port 12 ... Outer case 13 ... Inner case 13a ... Bottom part 13b ... Curved part 13c ... Receiving part 13d ... Central opening 14 ... Shoulder member 15 ... Bottom member 16 ... Handle 17 ... Upper case 18 ... Temperature sensor 19 ... Bottom coil 20 ... Side coil 21 ... Silver film 22 ... Rib 23 ... Square groove 24 ... Silicon rubber packing 25 ... Coil base 30 ... Ceramic plate 30a ... Hole 31 ... Gap 35,38,39 ... Hole 36 Plate retainer 37 Locking piece 40 Elastic member 40a Umbrella portion 41 Second elastic member 41a Horizontal portion 41b Vertical portion 45 Inner rubber packing 45a Recess 45b Flat portion 46 ... stepped portion 47 ... outer rubber gasket 47a ... recess 47b ... inclined portion 48 ... fitting groove 49 ... recess

Claims (1)

An inner case that forms an inner wall; a container body that forms an outer wall; a lid member that can be opened and closed with respect to the container body; induction heating type heating means provided between the inner case and the container body; In the rice cooker with a clay pot stored in the case,
The bottom of the clay pot has legs,
The heating means has a bottom coil that faces the bottom of the earthenware pot, and a side coil that faces the curved part of the earthenware pot,
A heat resistant member is attached to the bottom upper surface of the inner case at a position facing the bottom coil,
When housing the pot in the inner case, the leg, the addition to the position on the upper surface of the outer or the heat-resistant member of the heat-resistant member, forming a space between said refractory member and the pot bottom, said pot bottom And the gap, the heat-resistant member and the inner case in order from above between the bottom coil and the bottom coil,
The said space | gap communicates with the exterior, The air heated by the said space | gap moves up by natural convection at the time of the said heating means, and heats the outer side part of the said clay pot, The rice cooker characterized by the above-mentioned.

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