JP2009026470A - Induction heating cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent leakage of an electromagnetic wave to the maximum without impairing the product strength and cooling effect. <P>SOLUTION: In an induction heating cooker in which an induction heating coil 29 to induction heat a heating object (rice cooker 10) through a non-conductive member (protection frame 23) is arranged in an outer package, the induction heating coil 29 is provided with a first winding part 30 arranged so as to be located at the central lower part of a heating section to heat the heating object (10) and a second winding part 31 arranged in ring shape so as to be located at the outside with a prescribed spacing from the first winding part 30. A first and a second ring parts 37, 38 which nearly shield the projection face in perpendicular direction of the first and the second winding parts 30, 31 and cut off electromagnetic wave from each winding parts 30, 31, and have a lower resistance value than the heating object (10) are arranged so as to have a prescribed gap 40 between each other between the induction heating coil 29 and the bottom of the outer package. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an induction heating cooker such as an induction heating rice cooker or an electromagnetic cooker.

  In this type of induction heating cooker, an induction heating coil wound in an annular shape is disposed inside an exterior body, and an electric current is passed through the induction heating coil, so that the induction heating coil is disposed above by a high-frequency magnetic field generated. The pot that is heated is induction heated. However, in this induction heating cooker, the electromagnetic waves of the generated high-frequency magnetic field leak to the lower side where the pan is not disposed, that is, to the kitchen counter.

  Prior art document information related to an induction heating cooker having a structure for preventing leakage of electromagnetic waves includes the following.

JP 2000-58246 A JP 2006-20957 A

  These patent documents describe an induction heating type rice cooker. This rice cooker includes a protective frame that is a non-conductive member that detachably accommodates a rice cooker inside an exterior body, and the induction heating coil is disposed on the outer surface on the lower side of the protective frame. . The induction heating coil is fixed to the protective frame by a ferrite core for concentrating magnetic flux and improving induction heating efficiency for the rice cooker. An aluminum magnetic shielding plate is disposed between the ferrite core and the bottom of the exterior body in order to prevent leakage of electromagnetic waves.

  However, in this induction heating type cooker, it is necessary to increase the number of turns of the induction heating coil in order to increase the thermal power, but in this case, leakage of electromagnetic waves becomes significant. In order to solve this electromagnetic wave leakage problem, there are a method of adding a ferrite core to increase the focusing efficiency of the magnetic flux and a method of increasing the size of the magnetic shield.

  However, when a ferrite core is added, the effect of preventing electromagnetic wave leakage can be obtained, but the number of parts increases, and the ferrite core itself is expensive, resulting in an increase in cost. On the other hand, when the magnetic shield plate is enlarged, the space for forming the reinforcing ribs on the bottom body constituting the exterior body is reduced, so that the product strength is lowered. Note that, if the structure is provided with a magnetic shield plate on the upper side of the reinforcing rib, there is no problem of strength reduction, but a useless space is formed in the bottom portion, resulting in an increase in size of the product. In addition, when a large magnetic shield is provided, the cooling effect of the fan for cooling the induction heating coil is difficult to pass, so the cooling effect is reduced. In addition, when a large magnetic shield plate is provided, a large amount of current flows through the magnetic shield plate, which increases the loss of the induction heating coil, and as a result, an electronic component (IGBT) for controlling the induction heating coil. This increases the load of the product and shortens the usable period (life) of the product.

  This invention is made | formed in view of the conventional problem, and makes it a subject to provide the induction heating cooking appliance which can prevent the leakage of electromagnetic waves to the maximum, without impairing product strength and a cooling effect.

  In order to solve the above problems, an induction heating cooker according to the present invention is an induction heating cooker in which an induction heating coil that induction-heats an object to be heated is disposed in an exterior body through a non-conductive member. The induction heating coil is annularly arranged so as to be positioned outside the first winding portion disposed at a predetermined interval from the first winding portion, which is disposed at the lower center of the heating portion for heating the object to be heated. A second winding portion disposed, and between the induction heating coil and the bottom of the exterior body, the vertical projection surfaces of the first and second winding portions are substantially shielded from each winding portion. The first and second ring portions having a lower resistance value than the object to be heated that blocks the electromagnetic wave are arranged so that a predetermined gap is formed between them.

  According to this induction heating cooker, leakage of electromagnetic waves from the first winding part and the second winding part constituting the induction heating coil is maximized by the first ring part and the second ring part without increasing the cost. Can be prevented as much as possible. Specifically, when an electromagnetic wave passes through an annular ring part, an eddy current is generated in the same manner as an object to be heated. An electric field that is opposite (upward) to the downward electromagnetic wave (electric field) that leaks due to this eddy current is generated. As a result, these electric fields act so as to cancel each other. In the present invention, since the first ring portion and the second ring portion are formed and arranged so as to shield the projection surfaces of the first winding portion and the second winding portion, the electric field canceling action Therefore, leakage of electromagnetic waves can be reliably prevented.

  Moreover, since the space | gap part of a predetermined space | interval is formed between the 1st ring part and the 2nd ring part, air can be distribute | circulated through this space | gap part. As a result, it is possible to prevent the cooling efficiency of the induction heating coil from being hindered. Moreover, since the load of the electronic component for controlling the induction heating coil can be minimized, it is possible to prevent the product life from being shortened.

  In the induction heating cooker, the first and second winding portions are fixed by a ferrite core disposed so as to extend radially with respect to the non-conductive member, and the first ring portion and the second ring are fixed. It is preferable that the portions are integrally connected by a connecting portion positioned so as to substantially shield the vertical projection surface of the ferrite core. In this way, leakage of electromagnetic waves from the periphery of the ferrite core can be reliably prevented.

  In this case, it is preferable that the first and second ring portions coupled together are fixed to the holder of the ferrite core. If it does in this way, since a 1st ring part and a 2nd ring part can be assembled | attached integrally, the improvement of an assembly workability | operativity can be aimed at.

Moreover, it is preferable that the said exterior body is equipped with a metal body, and arrange | positions the side-plate part which interrupts | blocks the electromagnetic waves from the said induction heating coil in the position close | similar to this body.
In this case, it is preferable that the side plate portion is connected to the outer peripheral edge of the second ring portion.
Moreover, it is preferable to connect the said side-plate part located inside both sides with respect to the said trunk | drum so that it may make | form a ring with a lead wire.
If it does in this way, it can prevent that a metal body is induction-heated by the electromagnetic waves which leaked. Further, since the side plate portion is continuous by the continuous second ring portion and the lead wire, the same canceling action as described above can be obtained, and the leakage of electromagnetic waves can be reliably prevented. Moreover, the effect | action which interrupts | blocks the electromagnetic waves toward the part away from the trunk | drum by a lead wire can be acquired.

  Further, it is preferable that the exterior body includes a body and a bottom body that closes a lower end opening of the body, and a reinforcing rib protrudes upward on a bottom surface of the bottom body so that the reinforcing rib enters the gap. In this way, since the reinforcing rib having a large protrusion amount can be formed on the bottom body, the rigidity of the product can be improved.

  Furthermore, it is preferable to provide a bent wall portion that bends toward the non-conductive member on the outer peripheral edge of the second ring portion. If it does in this way, after arranging the 2nd ring part with a large diameter, the safety at the time of assembling other component parts can be improved.

  In the induction heating cooker of the present invention, leakage of electromagnetic waves from the first winding part and the second winding part constituting the induction heating coil is maximized by the first ring part and the second ring part without increasing the cost. Can be prevented as much as possible. Moreover, since air can be distribute | circulated through the space | gap part between a 1st ring part and a 2nd ring part, it can prevent inhibiting the cooling efficiency of an induction heating coil.

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

  FIG. 1 shows a rice cooker that is an induction heating cooker according to an embodiment of the present invention. This rice cooker includes a rice cooker 10 that is an object to be heated, a rice cooker body 11 that houses the rice cooker 10, and a lid 51 that is rotatably attached to the rice cooker body 11.

  The rice cooking pot 10 has an electric resistance value that is induction-heated by generating an eddy current on the outer surface of a pot base material made of aluminum or the like having a high thermal conductivity by electromagnetic waves generated when a high-frequency current is applied to the induction heating coil 29. A high material is provided by coating or bonding.

  The rice cooker body 11 includes a cylindrical body 12 made of a metal (SUS430) having upper and lower ends opened, a shoulder body 13 closing the upper end opening of the body, and a bottom body 15 closing the lower end opening of the body 12. It has. The shoulder body 13 is provided with an opening (not shown) that detachably accommodates the rice cooking pot 10, and an operation panel portion 14 is formed on the front face located on the left side in FIG. The bottom body 15 has a saucer shape in which an outer peripheral surface 17 is erected from the outer peripheral edge of the bottom surface 16, and reinforcing ribs 18 projecting upward are provided on the outer surface. The reinforcing rib 18 is located in the gap 40 of the magnetic shield plate 36, and the tip thereof is formed with a protruding amount that penetrates the gap 40. The bottom body 15 is provided with an intake portion 19 having a plurality of louvers on the front side, and an exhaust portion 20 having a plurality of louvers on the back side located on the right side. Further, a boss portion 21 for screwing corresponding to the bracket portion 24 of the protective frame 23 is provided.

  A metal inner cylinder 22 is disposed inside the exterior body so as to be positioned at the opening of the shoulder body 13, and a protective frame 23 that is a non-conductive member so as to cover the lower end opening of the inner cylinder 22. Is arranged. The internal space surrounded by the inner body 22 and the protective frame 23 constitutes a housing portion that houses the rice cooking pot 10.

  As shown in FIGS. 2 and 3, the protective frame 23 has a saucer shape curved in an arc shape, and a bracket portion 24 for fixing to the shoulder body 13 by screwing is provided on the outer peripheral edge thereof. ing. Moreover, the sensor attachment part 25 which penetrates and arrange | positions the temperature sensor (not shown) which detects the temperature of the rice cooking pot 10 accommodated in the protection frame 23 is provided so that it may be located in the back side. . Further, a support portion 26 is provided at the center of the protective frame 23 so as to protrude in a substantially cylindrical shape and come into contact with the opposing bottom body 15 in the assembled state. In the present embodiment, in the protective frame 23, on the outer surface facing the bottom body 15, positioning convex portions 27 and screwing portions 28 for positioning the ferrite core 32 are provided at intervals of about 120 degrees. Yes. Among them, the positioning convex portion 27 also serves as a support portion that contacts the bottom body 15 in the assembled state.

  An induction heating coil 29 that generates electromagnetic waves when a high-frequency current is applied to the outer surface of the protective frame 23 and electromagnetically heats the rice cooker 10 via the protective frame 23 is fixed via a ferrite core 32. ing. This induction heating coil 29 is arranged so as to form an arc shape from the outer periphery to the side part of the support part 26 that is the center of the protective frame 23 that is the center of the heating part, in order to maximize the heating area for the rice cooker 10. Has been established. Specifically, the induction heating coil 29 includes a first winding portion 30 wound to form an annular shape up to an outer diameter from the outer peripheral portion of the support portion 26 to a portion extending planarly, and the first winding. A second winding portion 31 that is positioned at a predetermined interval from the outer periphery of the turning portion 30 and wound in an annular shape so as to form a circular arc shape from the outside of the positioning convex portion 27 toward the opening end of the protective frame 23. Yes. And in this embodiment, these 1st winding parts 30 and the 2nd winding parts 31 are comprised by one continuous coil, and it is comprised so that there may be only one connection part to the control board 48. FIG. ing.

  The ferrite core 32 has a substantially J-shaped bar shape along the outer surface shape of the protective frame 23, and concentrates the electromagnetic waves generated from the induction heating coil 29 to locally heat the rice cooker 10. The ferrite core 32 is fixed in a holder 33 made of a nonconductive material (synthetic resin). The holder 33 is provided with a first bracket part 34 provided with a positioning groove 34 a for penetrating the positioning convex part 27, and a second bracket part 35 provided with a through hole 35 a superimposed on the screwing part 28. . The ferrite core 32 is attached to the protective frame 23 by screwing at an interval of 120 degrees, and the induction heating coil 29 is sandwiched and fixed between the ferrite core 32 and the protective frame 23. . In addition, the structure which arrange | positions three the ferrite cores 32 so that it may extend radially at intervals of 120 degree | times is the number employ | adopted widely by various rice cookers conventionally.

  Between the ferrite core 32 and the bottom body 15, an aluminum magnetic shield having a lower electrical resistance than the rice cooker 10 that prevents leakage of electromagnetic waves from the lower side of the induction heating coil 29 opposite to the rice cooker 10. A plate 36 is disposed. The magnetic shield plate 36 reflects electromagnetic waves generated from the induction heating coil 29 to the side of the rice cooker 10 so as not to leak outside through the bottom body 15. The first ring portion 37, The two-ring part 38, the connection part 41 which connects these, and a pair of side-plate part 44A, 44B are provided. The magnetic shield 36 is not limited to aluminum, and any material having a low electrical resistance value such as copper can be used.

  The first ring portion 37 has an annular shape having an inner and outer diameter substantially the same as the inner and outer diameters of the first winding portion 30 so as to shield the vertical projection surface of the first winding portion 30 in the assembled state. It is. The second ring portion 38 is an annular member having an inner and outer diameter substantially the same as the inner and outer diameters of the second winding portion 31 so as to shield the vertical projection surface of the second winding portion 31 in the assembled state. is there. In the present embodiment, only a part of the bottom body 15 where the boss 21 is close is provided with a notch 39 in order to prevent interference with the boss 21. A gap portion 40 having a predetermined interval is formed between the ring portions 37 and 38 formed of a pair of circular rings having different inner and outer diameters. In the assembled state, the reinforcing rib 18 formed on the bottom body 15 is positioned in the gap 40.

  The connecting portion 41 integrally connects the pair of ring portions 37 and 38. In this embodiment, the gap portion 40 substantially shields the vertical projection surface of the ferrite core 32 exposed from below. It is provided at intervals of 120 degrees. The connecting portion 41 is provided with a step portion 42 that bends upward (downward in FIG. 3) at an end located on the first ring portion 37 side, and the second ring with respect to the first ring portion 37 in the assembled state. The part 38 is configured to be positioned on the upper side. In addition, the connecting portion 41 is provided with a screw hole 43 corresponding to the second bracket portion 35 of the ferrite core 32 in the assembled state, and the screw hole 43 extends from the screw hole 43 to the screw fixing portion 28 of the protective frame 23 through the through hole 35a. The magnetic shield plate 36, the ferrite core 32, and the induction heating coil 29 are integrally fixed to the protective frame 23 by screwing. In the present embodiment, fixing of the magnetic shield plate 36 to the ferrite core 32 and fixing of the ferrite core 32 to the protective frame 23 can be performed by a single operation.

  The side plate portions 44 </ b> A and 44 </ b> B are connected to the outer peripheral edge closest to the metal body 12 in the second ring portion 38, and are bent along the body 12. The pair of side plate portions 44 </ b> A and 44 </ b> B has a rectangular shape and is connected so as to form an annular shape with the pair of lead wires 45 and 45.

  Further, a bent wall portion 46 that is bent toward the protective frame 23 so as to form a substantially L shape is further provided on the outer peripheral edge located on the back side in the assembled state in the second ring portion 38. . In the present embodiment, a cord reel 47 for connecting to a commercial power source is disposed between the body 12 and the protective frame 23 on the back side where the bent wall portion 46 is continuously provided. The cord reel 47 is already attached in FIG. 3, but actually, the inner body 22, the protective frame 23, the induction heating coil 29, the ferrite core 32, and the magnetic shield plate 36 are attached to the shoulder body 13. After installation, it is assembled.

  On the other hand, a control board 48 for controlling components including the induction heating coil 29 is disposed via a board holder 49 in a space located on the front side between the protective frame 23 and the body 12. The substrate holder 49 is provided with a fan 50 for cooling the control substrate 48. The cooling air from the fan 50 collides with the control board 48 and cools, then passes between the protective frame 23 on the downstream side and the bottom body 15, and is then exhausted from the exhaust unit 20 on the back side. And when passing between the protective frame 23 and the bottom body 15, it is comprised so that the induction heating coil 29 located in the space may be cooled.

  As shown in FIG. 1, the lid body 51 is a lock mechanism for opening the closed lid body 51 by operating the operation unit 52 inside an exterior body composed of an upper plate and a lower plate. And an exhaust path for discharging the steam in the rice cooker 10 to the outside, and is the same as the conventional one disposed rotatably with respect to the shoulder body 13.

  In the rice cooker configured as described above, the magnetic shield 36 including the first and second ring portions 37 and 38 connected by the connecting portion 41 can be integrally assembled to the holder 33 of the ferrite core 32. Attaching workability can be improved. Further, when the cord reel 47 is assembled after the magnetic shield plate 36 is assembled, there is a possibility that the operator may be injured by the edge of the metal magnetic shield plate 36. In this embodiment, the second ring portion 38 is used. Since the bent wall portion 46 is provided on the outer peripheral edge of the lens, it is possible to prevent such a problem from occurring and improve safety.

  And when a user operates the switch of the operation panel part 14 and performs rice cooking control, the induction heating coil 29 induction-heats the rice cooking pot 10 which is a to-be-heated object, the electromagnetic waves which generate | occur | produce are mainly the ferrite core 32. And a magnetic field directed to the rice cooking pot 10 is generated. Then, in the rice cooker 10, when an eddy current is generated by this magnetic field, the resistance value is high and heat is generated to heat the water and rice contained therein. Further, all of the electromagnetic waves generated by the induction heating coil 29 do not go to the upper rice cooker 10 through the ferrite core 32, and part of the electromagnetic waves are radiated downward. Then, the electromagnetic wave directed downward is passed through the magnetic shield plate 36.

  When the electromagnetic wave passes through the first and second ring portions 37 and 38 having an annular shape, an eddy current is generated as in the rice cooking pot 10. Then, an electric field that is opposite (upward) to the downward electromagnetic wave (electric field) that leaks due to the eddy current is generated. As a result, these electric fields act so as to cancel each other. In the present embodiment, the first ring portion 37 and the second ring portion 38 are formed and arranged so as to shield the projection surfaces of the first winding portion 30 and the second winding portion 31. The electric field canceling action can be maximized.

  The leakage of electromagnetic waves is not limited to the first and second winding portions 30 and 31, but also occurs from the ferrite core 32 that concentrates the magnetic flux. However, in this embodiment, the first ring portion 37 and the second ring portion 38 are integrally formed by the connecting portion 41, and the projection surface of the ferrite core 32 is shielded by the connecting portion 41. Therefore, the electromagnetic wave leaking from the ferrite core 32 can be absorbed by the connecting portion 41. Here, when a single magnetic shield plate is individually arranged so as to correspond to each ferrite core 32, an ideal eddy current cannot be generated, so that a sufficient electromagnetic wave canceling action cannot be obtained. . However, in the present embodiment, since the connecting portion is continuous with the first ring portion 37 and the second ring portion 38, a sufficient canceling action can be obtained through this.

  Moreover, in this embodiment, since the body 12 constituting the exterior body is made of metal, the side portion closest to the outer peripheral portion of the second winding portion 31 of the induction heating coil 29 can be induction-heated by electromagnetic waves. There is sex. However, in this embodiment, the side plate portions 44A and 44B are provided on the magnetic shield plate 36 so as to correspond to the portion. Moreover, the side plate portions 44 </ b> A and 44 </ b> B are connected to the second ring portion 38 and connected to form a ring by the lead wires 45 and 45. Therefore, it is possible to reliably block the electromagnetic wave radiated from the second winding part 31 in the lateral direction and obtain a sufficient canceling action, so that the metal body 12 can be prevented from being induction-heated.

  Thus, in the rice cooker of this embodiment, the electromagnetic wave from the ferrite core 32 for concentrating the leakage of the electromagnetic wave from the 1st winding part 30 and the 2nd winding part 31 which comprises the induction heating coil 29, and a magnetic flux. Leakage and electromagnetic wave leakage from the side can be prevented to the maximum without increasing the cost.

  In addition, since the gap portion 40 with a predetermined interval is formed between the first ring portion 37 and the second ring portion 38, the cooling air from the fan 50 can be sufficiently passed through the gap portion 40. As a result, it is possible to prevent the cooling efficiency of the induction heating coil 29 from being hindered. Since the reinforcing rib 18 formed on the bottom body can be positioned in the gap portion 40, the reinforcing rib 18 having a large protruding amount can be formed on the bottom body 15. As a result, since the rigidity of the bottom body 15 can be improved, the rigidity of the visual object itself can be improved. Moreover, since the magnetic shield plate 36 has a shape corresponding to the leakage portion of the electromagnetic wave, it generates a magnetic field symmetrical to the magnetic field generated by the winding portions 30 and 31. Therefore, it is possible to effectively cancel out the leaked electromagnetic wave, and the loss of the induction heating coil 29 is not increased, and the load on the electronic component is small. Further, since the magnetic shield plate 36 is provided with only a necessary minimum area, it is easy to secure a ventilation path for cooling air. As a result, the load on the electronic component (IGBT) for controlling the induction heating coil 29 mounted on the control board 48 can be suppressed to the minimum necessary, and thus the product life can be prevented from being shortened.

  In addition, the induction heating cooking appliance of this invention is not limited to the structure of the said embodiment, A various change is possible.

  For example, in the above embodiment, the bent wall portion 46 of the magnetic shield 36 is provided only in the portion corresponding to the cord reel 47 to be assembled later, but as shown in FIGS. 4 (A) and 4 (B), You may provide over the whole outer periphery of the 2 ring part 38. FIG.

  Moreover, in the said embodiment, although the 1st winding part 30 and the 2nd winding part 31 which comprise the induction heating coil 29 were provided by winding one continuous coil, respectively another coil is provided. It is good also as a structure wound up.

  Furthermore, in the said embodiment, although the 1st ring part 37, the 2nd ring part 38, and side-plate part 44A, 44B were integrally molded as one magnetic-shield board 36, you may provide in a different body, respectively.

  Furthermore, in the said embodiment, although the rice cooker was applied as an induction heating cooking appliance, the to-be-heated material is induction-heated by induction heating, such as an electromagnetic cooking appliance which induction-heats a pan via the top plate which is a nonelectroconductive member. Applicable to any cooking device.

  And in the said embodiment, although the induction heating coil 29 was set as the structure which has the 1st and 2nd winding parts 30 and 31, it is good also as a structure which has three or more winding parts. In this case, if three or more ring parts are formed so as to correspond to each winding part, the same operation and effect as described above can be obtained.

It is sectional drawing which shows the rice cooker which is the induction heating cooking appliance which concerns on embodiment of this invention. It is a perspective view which shows the state which removed the bottom body. It is a disassembled perspective view of an exterior body, a protective frame, an induction heating coil, a ferrite core, and a magnetic-shield board. (A), (B) is a perspective view which shows the modification of a magnetic-shield board.

Explanation of symbols

10 ... Rice cooker (to be heated)
12 ... Body (exterior body)
13 ... Shoulder body (exterior body)
15 ... Bottom body (exterior body)
18 ... Reinforcing ribs 23 ... Protective frame (non-conductive member)
DESCRIPTION OF SYMBOLS 29 ... Induction heating coil 30 ... 1st winding part 31 ... 2nd winding part 32 ... Ferrite core 33 ... Holder 36 ... Magnetic-shield board 37 ... 1st ring part 38 ... 2nd ring part 40 ... Air gap part 41 ... Connection part 44A, 44B ... side plate portion 45 ... lead wire 46 ... bent wall portion 50 ... fan

Claims (8)

In an induction heating cooker in which an induction heating coil for inductively heating an object to be heated is disposed inside the exterior body via a non-conductive member.
The induction heating coil has a first winding portion disposed so as to be positioned at a lower center portion of a heating portion that heats the object to be heated, and an annular shape so as to be positioned outside the first winding portion with a predetermined interval. And a second winding part disposed on the
Between the induction heating coil and the bottom of the exterior body, the vertical projection surfaces of the first and second winding parts are substantially shielded, and the resistance value is higher than that of the heated object that blocks electromagnetic waves from each winding part. An induction heating cooker, wherein the first and second ring portions having a low height are arranged so that a predetermined gap portion is formed between them. The first and second winding portions are fixed by a ferrite core disposed so as to extend radially with respect to the non-conductive member,
2. The induction heating according to claim 1, wherein the first ring part and the second ring part are integrally connected by a connecting part positioned so as to substantially shield a vertical projection surface of the ferrite core. Cooking device.   The induction heating cooker according to claim 2, wherein the first and second ring portions connected together are fixed to a holder of the ferrite core.   The said exterior body is equipped with the metal fuselage, The side-plate part which interrupts | blocks the electromagnetic waves from the said induction heating coil in the position close | similar to this fuselage is arrange | positioned. The induction heating cooker according to item 1.   The induction heating cooker according to claim 4, wherein the side plate portion is connected to an outer peripheral edge of the second ring portion.   The induction heating cooker according to claim 4 or 5, wherein the side plate portions located inside both sides with respect to the body are connected by a lead wire so as to form an annular shape.   The exterior body includes a body and a bottom body that closes a lower end opening of the body, a reinforcing rib projecting upward on a bottom surface of the bottom body, and the reinforcing rib is inserted into the gap. The induction heating cooker according to any one of claims 1 to 6.   The induction heating cooking according to any one of claims 1 to 7, wherein a bent wall portion that bends toward the non-conductive member is provided on an outer peripheral edge of the second ring portion. vessel.

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