JP2009165594A - Induction heating cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent influence of induction heating in order to prevent melting loss. <P>SOLUTION: Induction heating coils 60 are formed by at least two coil groups having a first coil group 61 disposed at the center of the bottom of an inner pot 10 and a second coil group 62 annularly disposed on the outer side with a prescribed space (a gap S) from the outer periphery of the first coil group 61. In addition, a resilient support part 54 is disposed between the bottom 27 of a shell and a protection frame 41. The resilient support part 54 urges the protection frame 41 upward in such a way as movable in the vertical direction to be located in a non-coil part 63 between the adjacent coil groups of the induction heating coils 60, and resiliently contracts when the inner pot 10 is mounted. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an induction heating cooker.

  In this type of induction heating cooker, a protective frame made of a non-conductive material is disposed inside an exterior body, and an induction heating coil wound in an annular shape is disposed on the outer surface of the protective frame. Further, the inner pan has a pan flange portion projecting outward at the upper end opening, and is accommodated so that the pan flange portion is hooked and suspended in the inner pan housing portion having the protective frame. ing. And by supplying an electric current to the induction heating coil, the inner pot accommodated in a state separated from the protective frame by a certain distance by the generated high-frequency magnetic field is induction-heated. In this induction heating, in order to appropriately heat the inner pot, the positional relationship between the inner pot and the induction heating coil is important.

  However, the induction heating coil is disposed on the outer surface of the protective frame, and the protective frame is attached to a shoulder member constituting the exterior body. Therefore, the positional relationship between the inner pot and the induction heating coil is affected not only by the protective frame, but also by the dimensional accuracy of each part constituting the inner pot accommodating portion, and further by the assembly accuracy. Therefore, the positional relationship of each product and the variation of the heating amount accompanying this are inevitable.

  Prior art document information related to induction heating cookers designed to prevent the occurrence of such problems includes the following.

Japanese Patent No. 3296949 JP 2003-190004 A

  In these Patent Documents 1 and 2, a protective frame on which the inner pot is placed is arranged so as to be movable up and down with respect to the exterior body, and by bringing the inner pot into contact with the protective frame, the outer surface of the protective frame is placed. A rice cooker is described in which the distance between the arranged induction heating coil and the inner pot can be kept constant.

  Specifically, in the rice cooker described in Patent Literature 1, the elastic support portion that elastically supports the protective frame so as to be movable up and down, the leg portions that project radially from the protective frame, or the center bottom portion of the protective frame It is arranged. Moreover, in patent document 2, an elastic support part is located between the temperature sensor made to contact | abut to the center bottom part of a protective frame, and the convex part made to contact an inner pot, and the lower side of the inner side winding group of an induction heating coil It arrange | positions so that it may be located in.

  However, as in the former of Patent Document 1, when a leg portion is provided on the protective frame and a spring constituting the elastic support portion is disposed between the leg portion and the bottom of the exterior body, the protective frame is enlarged. In addition, since the protruding leg portions obstruct the arrangement of other parts, there is a problem that the product is increased in size. Moreover, in the latter of patent document 1 and patent document 2, since a spring is induction-heated at the time of cooking, there exists a problem that the resin-made protective frame or exterior body which hold | maintains a spring deteriorates, and it melts in the worst case. .

  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 receiving the influence of induction heating and can prevent generation | occurrence | production of melt | disassembly.

  In order to solve the above problems, an induction heating cooker according to the present invention is provided with an inner pot accommodating portion having a protective frame made of a non-conductive material inside an exterior body, and an induction heating coil on the outer surface of the protective frame. An induction heating cooker that is disposed and detachably accommodates an inner pot from an upper end opening of the inner pot accommodating portion, and heats the inner pot by the induction heating coil, wherein the induction heating coil is connected to the inner pot. A first winding group disposed so as to be located at the center of the bottom; and a second winding group disposed in an annular shape so as to be located outside the outer peripheral portion of the first winding group at a predetermined interval. The protective frame is divided into two or more winding groups, and is positioned between the bottom surface of the exterior body and the protective frame so as to be positioned at a non-winding portion between adjacent winding groups of the induction heating coil. Is urged upward so that it can move up and down, and for placing the inner pot Ri is an elastically structure provided with elastic support portions to contract.

  Specifically, in the induction heating cooker, the elastic support portion includes a support rib protruding from the bottom surface of the protective frame or the exterior body, and a spring supported by the support rib.

  According to this induction heating cooker, since the protective frame constituting the inner pot accommodating portion is arranged to be movable up and down with respect to the exterior body, when the inner pot is accommodated, the bottom of the inner pot touches the protective frame. Touch and move the protective frame downward. Therefore, the distance between the induction heating coil and the inner pot can be kept constant without being affected by the dimensional accuracy and assembly accuracy of each component. As a result, it is possible to prevent the variation in the heating amount for each product and for each cooked rice.

  Further, since the elastic support portion is provided so as to be positioned between the winding groups, it is not necessary to provide a portion that protrudes radially outward in the protective frame. Therefore, since the preset minimum storage space can be used effectively, it is possible to prevent an increase in size of the product itself accompanying an increase in the size of the protective frame. Further, since the adjacent winding groups are portions that act so as to cancel each other's magnetic flux, even if the spring constituting the elastic support portion is located in that portion, the spring is induction-heated. There is nothing. Therefore, it is possible to prevent the resin-made protective frame and the outer casing that are in contact with the spring from being melted by induction heating of the spring.

  Moreover, it is preferable that the said elastic support part is further provided with the protrusion part or recessed part which the said spring contact | abuts on the bottom face or protective frame of the said exterior body. If it does in this way, the intensity | strength of the part which a spring contacts in an exterior body can be raised. Thereby, it can prevent that the bottom face of an exterior body is damaged by the impact at the time of a protective frame falling, and can suppress the change of the elastic force of the spring by a deformation | transformation of a bottom face.

Furthermore, it is preferable to provide a contact portion that protrudes toward the table to be placed at or near the formation position of the elastic support portion on the bottom surface of the exterior body.
In this case, it is preferable that the contact portion protrudes so as to form a predetermined gap with respect to the table.
In this way, while absorbing the impact when the protective frame is lowered, excess impact can be passed to the table, so that damage to the bottom surface of the exterior body can be reliably prevented.

  In the induction heating cooker of the present invention, since the protective frame constituting the inner pot accommodating portion is arranged to be movable up and down with respect to the exterior body, it is possible to prevent the variation in the heating amount for each product and for each rice cooking. . Moreover, since the elastic support portion is provided so as to be positioned between the winding groups, the product itself can be prevented from being enlarged. Furthermore, between the adjacent winding groups is a part that acts so as to cancel each other's magnetic flux, so the spring that constitutes the elastic support part located in that part is not induction-heated, and is made of resin. It is possible to prevent the protective frame and the exterior body from being melted.

  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. The rice cooker includes an inner pot 10 that is an object to be heated, a rice cooker body 11 that houses the inner pot 10, and a lid 65 that is rotatably attached to the rice cooker body 11. In addition, in FIG. 1, in order to clarify the structure of the outer body of the rice cooker main body 11, and the inner pot accommodating part which accommodates the inner pot 10 so that attachment or detachment is possible, internal mechanisms, such as a control board, are abbreviate | omitted.

  The inner pot 10 has an electric resistance value that is induction-heated by generating eddy currents by electromagnetic waves generated when energizing a high-frequency current to the induction heating coil 60 on the outer surface of a pot base material made of aluminum or the like having high thermal conductivity. A high material is provided by coating or bonding. The inner pan 10 is provided with a pan flange portion 10a projecting outward at the upper end thereof.

  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 that closes the upper end opening of the body 12, and a bottom body 26 that closes the lower end opening of the body 12. The exterior body which has these. The outer casing is provided with an inner pot accommodating portion having a protective frame 41 and an inner trunk 38 inside, and the inner pot 10 is detachably accommodated in the inner pot accommodating portion. In the present embodiment, the induction heating coil 60 is disposed on the outer surface of the protective frame 41 constituting the inner pot accommodating portion, and the protective frame 41 is disposed so as to be vertically movable by the elastic support portion 54. And the inner pot 10 is comprised so that the pot flange part 10a may be mounted in the opening part 20 of an inner pot accommodating part, and the bottom is mounted in the protection frame 41.

  As shown in FIGS. 1 and 2, the shoulder body 13 is an upper member that constitutes an upper portion of the exterior body, and an outer peripheral portion thereof is provided with a mounting rib 14 that fits inside the body 12. Yes. A hinge connection portion 15 for rotatably mounting the lid body 65 is provided on the back portion of the shoulder body 13. Further, an operation panel portion 16 is formed on the shoulder body 13 on the front side located on the left side in FIG. A first screwing portion 17 for fixing a liquid crystal display panel and a display substrate on which a switch is mounted is provided inside the operation panel portion 16. In the operation panel unit 16, a transparent resin cover 18 is disposed in an opening that exposes the liquid crystal display panel so as to be seen through. Furthermore, a second screwing portion 19 for disposing a substrate holder and a fan (not shown) is provided inside the operation panel portion 16.

  The shoulder body 13 is provided with an opening 20 serving as an upper end opening of the inner trunk housing portion. An annular portion 21 for fixing the inner body 38 is provided around the inside of the opening 20. The annular portion 21 is provided with a slit 22 extending in the vertical direction at a predetermined interval in the circumferential direction, and a third screwing portion 23 is provided on the upper portion of the slit 22. Further, a fourth screwing portion 24 for fixing the bottom body 26 is provided around the annular portion 21 so as to form a predetermined internal space. The fourth screwing portion 24 is provided with a regulating plate portion 25 that protrudes in a plate shape radially inward toward the center of the opening 20.

  The bottom body 26 is a lower member constituting the lower portion of the exterior body, and is provided with a mounting rib 28 that fits inside the fuselage 12 on the outer peripheral portion of the bottom surface 27 having a substantially elliptical shape in plan view. It is. On the front side and the back side of the shoulder body 13, an intake portion 29 and an exhaust portion 30 each having a plurality of slits are provided. Further, on the bottom surface 27 of the bottom body 26, a leg portion 31 protruding downward is provided at a predetermined position on the outer peripheral portion. Thereby, the bottom face 27 is comprised so that it may be spaced apart from the surface of the table T which mounts a rice cooker with a predetermined space | interval.

  And on the bottom surface 27 of the bottom body 26, plate-shaped guide portions 32 extending in the radial direction are provided at predetermined intervals in the circumferential direction so as to form a substantially cylindrical shape at positions corresponding to the bottom center of the protective frame 41, which will be described later, and up and down. It is projected with. In addition, the bottom surface 27 of the bottom body 26 has a non-between a first winding group 61 and a second winding group 62 of the induction heating coil 60 described later around a plurality of annular plate-shaped guide portions 32. The protruding portion 33 is provided so as to be positioned at a lower portion in the vertical direction with respect to the winding portion 63. The protrusion 33 bulges upward so as to form a substantially disk shape, and its diameter is slightly larger than the diameter of a spring 53 described later. Further, the bottom body 26 is provided with a boss portion 34 protruding upward so as to form a substantially conical cylinder shape at a position corresponding to the fourth screwing portion 24 of the shoulder body 13. The boss portion 34 is closed at the upper end and is provided with an insertion hole for allowing a screw to pass through the center thereof. A guide tube portion 35 is provided on the outer peripheral portion so as to form a cylindrical shape. The guide tube portion 35 is provided with an insertion groove 36 for allowing the restricting plate portion 25 of the shoulder body 13 to penetrate and protrude. And in this embodiment, the contact part 37 which protrudes downward so that it may form a cylindrical shape similarly is provided in the position which provided the protrusion part 33 of the bottom face 27. As shown in FIG. The contact portion 37 is provided so as to project a predetermined gap with respect to the opposing table T.

  As shown in FIGS. 1 and 4, the inner body 38 is made of a metal having a cylindrical shape disposed so as to be positioned at the opening 20 of the shoulder body 13. A screwing piece 39 for fixing to the third screwing portion 23 is provided. Further, an edge 40 that is curved outward (curled) so as to form a circular cross section is provided at the lower end edge of the inner body 38.

  The protective frame 41 is made of a resin that is a non-conductive material disposed so as to cover the lower end opening of the inner body 38. As shown in FIG. 2, the protective frame 41 has a tray shape including a bottom portion 42 having a disk shape and an expanding portion 43 that expands upward so that the diameter gradually increases. The bottom portion 42 of the protective frame 41 is provided with a plurality (five in the embodiment) of projecting portions 44 for accommodating the bottom of the inner pot 10 with a predetermined gap. Moreover, the sensor attachment part 45 which has the hole which attaches the temperature sensor which detects the temperature of the inner pot 10 is provided in the expansion part 43 of the protective frame 41 so that it may be located in the upper part at the back side. In addition, an arrangement portion 46 for arranging a cord reel for winding a power cord for connection with a commercial power supply so as to be extended is provided on the back of the protective frame 41. Further, a fitting rib 47 is provided on the upper end edge of the expanding portion 43 so as to fit the edge portion 40 of the inner body 38.

  The protective frame 41 of the present embodiment is provided with a cylindrical guide portion 48 that protrudes downward along the axial direction at the center of the bottom portion 42. The cylindrical guide portion 48 is fitted inside a plurality of plate-shaped guide portions 32 formed on the bottom body 26, and the horizontal inclination of the protective frame 41 is regulated with the plate-shaped guide portions 32. An inclination restricting portion 49 is configured. A guide rib 50 that protrudes radially outward is provided on the outer peripheral portion of the cylindrical guide portion 48 so as to be positioned between the adjacent plate-like guide portions 32 and 32. Further, a bulging portion 51 that bulges outward in the radial direction so as to form a semi-cylindrical shape is provided between the adjacent guide ribs 50.

  The protective frame 41 is provided with a support rib 52 that protrudes downward from the protruding portion 33 of the bottom body 26 so as to be positioned on the outer periphery of the bottom portion 42. The support rib 52 has a cross-sectional + character shape, and a spring 53 is supported on the outer peripheral portion thereof. The support rib 52 and the spring 53 constitute an elastic support portion 54 that urges the protective frame 41 upward so as to be movable up and down with the protruding portion 33 formed on the bottom body 26. Note that, on the outer peripheral portion of the support rib 52, a screwing portion 55 for fixing the ferrite core 64 so as to protrude downward from the lower portion of the expanded portion 43, and a support protrusion 56 that supports the side surface of the ferrite core 64. And are provided.

  Further, the protective frame 41 is provided with a flange portion 57 projecting radially outward at the upper end edge of the expanded portion 43, that is, the lower end edge of the fitting rib 47. The flange portion 57 extends toward the upper end surface of the boss portion 34 of the bottom body 26, while the outer peripheral edge is formed with a diameter that does not contact the guide tube portion 35 of the boss portion 34. Thus, in the assembled state, the flange portion 57 abuts against the upper end surface of the boss portion 34 of the bottom body 26 by moving the protective frame 41 downward against the urging force of the spring 53, while releasing the pressure. Then, the protective frame 41 moves upward by the urging force of the spring 53, thereby coming into contact with the lower end edge of the regulation plate portion 25 of the shoulder body 13. That is, the boss portion 34 of the bottom body 26 serves as a stopper portion that restricts the downward movement of the protective frame 41, and the restriction plate portion 25 of the shoulder body 13 restricts the upward movement of the protective frame 41. Serves as a stopper. However, in the present embodiment, when the inner pot 10 is accommodated, the downward movement of the protective frame 41 stops with the pot flange portion 10a placed on the opening 20, so that the flange portion 57 is at the bottom. There is no contact with the boss 34 of the body 26.

  The protective frame 41 is provided with a guide groove 58 protruding outward in the radial direction so as to form a substantially concave shape on the upper portion of the flange portion 57. The guide groove portion 58 is provided at a position corresponding to the insertion groove 36 provided in the boss portion 34. When the shoulder body 13 is mounted, the regulation plate portion 25 of the shoulder body 13 is inserted into the guide groove portion 58. The guide groove portion 58 and the restricting plate portion 25 constitute a rotation restricting portion 59 that restricts rotation in the circumferential direction of the protective frame 41 with the inclination restricting portion 49 as the center.

  An induction heating coil 60 that generates electromagnetic waves when a high-frequency current is applied to the outer surface of the protective frame 41 and electromagnetically heats the inner pot 10 via the protective frame 41 is fixed via a ferrite core 64. Yes. The induction heating coil 60 is disposed so as to be positioned at the center of the bottom of the inner pot 10, and to be positioned on the outer side with a predetermined interval from the outer periphery of the first winding group 61. And a second winding group 62 arranged. The first winding group 61 is wound so as to form a planar annular shape from the outer peripheral portion of the cylindrical guide portion 48 of the protective frame 41 to the vicinity of the support rib 52. The second winding group 62 is located at a predetermined interval from the outer periphery of the first winding group 61, and in the expanded portion 43, the vicinity of the sensor mounting portion 45 from the outer peripheral portion of the screwing portion 55 and the support protrusion 56. It is wound so as to form a substantially conical cylindrical shape (annular shape in plan view). The first winding group 61 and the second winding group 62 are composed of continuous winding lines (about 3 mm in diameter) formed by converging a plurality of single wires into one, and adjacent winding lines of the respective winding groups 61 and 62. Is fixed by an adhesive.

  In the induction heating coil 60 configured in this way, a non-winding portion 63 that is not wound with a predetermined winding wire is formed between the first winding group 61 and the second winding group 62. In the assembled state, the support rib 52 of the protective frame 41 is positioned on the non-winding portion 63. That is, the elastic support portion 54 that urges the protective frame 41 upward so as to move up and down is provided so as to be positioned in the non-winding portion 63 between the adjacent winding groups 61 and 62 of the induction heating coil 60. Yes.

  The ferrite core 64 has a substantially J-shaped rod shape along the outer surface shape of the protective frame 41, and concentrates the electromagnetic waves generated from the induction heating coil 60 to locally heat the inner pot 10. The ferrite core 64 is fixed in a holder made of a non-conductive material (synthetic resin). The holder is formed with a bracket portion (not shown) for screwing and fixing to the screw fastening portion 55 of the protective frame 41 as in the conventional case.

  As shown in FIG. 1, the lid 65 is provided with a lock mechanism for opening the closed lid 65 by operating the operation unit 66 on the exterior body composed of an upper plate and a lower plate. It is provided with an exhaust path for discharging the steam in the inner pot 10 to the outside, and is the same as the conventional one disposed rotatably with respect to the shoulder body 13.

  The rice cooker configured in this manner energizes the induction heating coil 60 in accordance with a program stored in advance by a microcomputer, which is a control means mounted on the control board, and preheats, raises the temperature (medium patch), maintains boiling, and unevenness. After performing rice cooking control which consists of processes, such as chopping, the heat retention control which maintains the inside of the inner pot 10 at predetermined temperature is performed.

  Next, an example of assembly work of the rice cooker will be described.

  First, the induction heating coil 60 is divided into a first winding group 61 and a second winding group 62, and in particular, the second winding group 62 is bonded to adjacent wirings along the outer peripheral surface of the protective frame 41. The state is made. And this induction heating coil 60 is arrange | positioned on the outer surface of the protection frame 41, the ferrite core 64 is arrange | positioned from the outer side, and it fixes to the screwing part 55 by screwing. Further, in the protective frame 41, a spring 53 is disposed on a support rib 52 that protrudes from between the first winding group 61 and the second winding group 62 of the induction heating coil 60.

  Next, as shown in FIG. 4, a protective frame 41 to which the induction heating coil 60 and the ferrite core 64 are fixed is disposed in the bottom body 26. At this time, the inclination restricting portion 49 is configured such that the guide groove portion 58 of the protective frame 41 constituting the rotation restricting portion 59 is positioned in the insertion groove 36 of the guide cylinder portion 35 formed in the boss portion 34 of the bottom body 26. The cylindrical guide part 48 of the protective frame 41 is fitted into the plate-like guide part 32 of the bottom body 26. Thereafter, other mounting components such as a cord reel and a temperature sensor (not shown) are arranged.

  Further, an inner body 38 is disposed on the shoulder body 13, and the inner body 38 is fixed to the third screwing portion 23 by screwing. Further, the display board is fixed to the shoulder body 13 with screws, and a board holder provided with a control board and a fan is fixed.

  Then, with the body 12 fitted to the bottom body 26, as shown in FIG. 5, the shoulder body 13 to which the inner body 38 is fixed is disposed from above. At this time, as shown in the drawing, the tip end of the fourth screwing portion 24 of the shoulder body 13 is inserted into the boss portion 34 of the bottom body 26, and the restriction plate portion 25 of the shoulder body 13 constituting the rotation restriction portion 59 is attached to the protective frame 41. The guide groove 58 is inserted. Further, the lower end edge of the inner body 38 is fitted into the fitting rib 47 of the protective frame 41 (see FIG. 4). In FIG. 5, the body 12, the inner body 38, and other mounting parts are not shown so that the assembled state of the shoulder body 13 and the bottom body 26 becomes clear.

  Thereafter, the body 12, the shoulder body 13, and the bottom body 26 are fixed by screwing to the fourth screwing portion 24 of the shoulder body 13 through the inside of the boss portion 34 from the outside (bottom) side of the bottom body 26. Next, the lid body 65 is rotatably attached to the hinge connection portion 15 of the shoulder body 13.

  In the rice cooker configured as described above, the protective frame 41 constituting the inner pot accommodating portion is urged upward by the elastic support portion 54 so as to be movable up and down. Therefore, as shown in FIG. 6, in a state where the inner pot 10 is not accommodated, the protective frame 41 is urged upward by the spring 53 that constitutes the elastic support portion 54, and the flange portion 57 that is the bottom of the guide groove portion 58. However, the state which contact | abutted to the lower end edge of the control board part 25 of the shoulder body 13 which comprises a stopper part is made | formed.

  In this state, as shown in FIG. 7, when the inner pot 10 is accommodated in the inner pot accommodating portion, first, the bottom of the inner pot 10 comes into contact with the protrusion 44 of the protective frame 41, thereby The protective frame 41 moves downward against the urging force of the spring 53 by weight. Next, the pan flange portion 10 a of the inner pan 10 is placed on the upper end portion of the opening 20 of the shoulder body 13, whereby the downward movement of the protective frame 41 is stopped. Therefore, the flange part 57 of the protective frame 41 does not contact the boss part 34 of the bottom body 26, and the inner pot 10 has the pot flange part 10 a placed on the opening 20 of the inner pot accommodating part, and the bottom is the protective frame. It is held in a state where it is placed on 41.

  On the other hand, when the inner pot 10 is taken out, the protective frame 41 is moved upward by the urging force of the spring 53. Then, the upward movement of the protective frame 41 is stopped in a state where the flange portion 57 is in contact with the restriction plate portion 25 of the shoulder body 13 constituting the stopper portion.

  Thus, since the rice cooker of this embodiment arrange | positions the protective frame 41 with respect to the exterior body of the rice cooker main body 11 like the past, it is arrange | positioned so that the dimensional accuracy and assembly | attachment of each component are possible. The distance between the induction heating coil 60 and the inner pot 10 can be kept constant without being affected by accuracy. As a result, it is possible to prevent the variation in the heating amount for each product and for each cooked rice.

  In this embodiment, the elastic support portion 54 is provided so as to be positioned between the winding groups 61 and 62, and the tilt restricting portion 49 is provided in the center of the bottom of the protective frame 41, so that the protective frame 41 has a radial direction. The part which protrudes outward is not formed. Therefore, it is possible to prevent the product itself from being enlarged as the protective frame 41 is enlarged.

  Further, the center of the bottom of the protective frame 41 provided with the tilt restricting portion 49 is the portion having the best dimensional accuracy, and therefore hardly affects the assembly accuracy with respect to the bottom body 26. In other words, in this embodiment, since the sensor mounting portion 45 of the temperature sensor is provided in the widened portion 43 of the protective frame 41, the tilt regulating portion 49 is formed at the center of the bottom with the best dimensional accuracy and assembly accuracy. Can do. As a result, the protective frame 41 can be moved in the vertical direction while reliably preventing the horizontal tilt of the protective frame 41.

  Furthermore, in the present embodiment, the outer periphery of the protective frame 41 and the shoulder body 13 are provided with the rotation restricting portion 59 that restricts the rotation of the protective frame 41 in the circumferential direction around the inclination restricting portion 49. The horizontal state of 41 can be maintained more reliably. In addition, since the rotation of the protective frame 41 can be prevented, breakage of the lead wires connected to components such as the induction heating coil 60 and the temperature sensor disposed on the protective frame 41 can be prevented. As a result, the sensor mounting portion 45 of the temperature sensor having a lead wire can be provided in the expanded portion 43 of the protective frame 41. Moreover, since the rotation of the protective frame 41 is prevented, the attachment position of the temperature sensor (the contact position with the inner pot 10) does not change, and a constant cooked state can be maintained.

  When the protective frame 41 is lowered, the bottom body 26 is provided with a protruding portion 33 that receives the spring 53, and the strength of that portion is increased. In addition, since the abutment portion 37 projecting so as to form a predetermined gap with respect to the table T is formed at the position where the projection portion 33 is formed, the impact when the protective frame 41 is lowered is applied to the bottom surface. 27, the excessive impact can be received by the contact portion 37 contacting the table T. As a result, it is possible to prevent the bottom surface 27 of the bottom body 26 from being damaged by an impact caused by the lowering of the protective frame 41.

  On the other hand, when the protective frame 41 is raised, the shoulder plate 13 is provided with the restricting plate portion 25 that serves as a stopper portion, so that it is possible to prevent an impact (load) on the inner barrel 38 constituting the inner pot accommodating portion. As a result, an error occurs with time in the assembling accuracy of the inner cylinder 38, and it is possible to prevent the protective frame 41 from moving up and down in a tilted state.

  Furthermore, the spring 53 that constitutes the elastic support portion 54 is a component that may be induction-heated when the induction heating coil 60 is energized, but as shown by a two-dot chain line in FIG. Between 61 and 62, it is a part which acts so that mutual magnetic flux S1 and S2 cancel each other, Therefore The spring 53 is not induction-heated. In other words, the adjacent winding groups 61 and 62 each form a non-winding portion 63 with a predetermined interval between them so that a group of magnetic fluxes S1 and S2 are formed by themselves. The elastic support part 54 is formed in the non-magnetic field forming part by the part 63. Therefore, it is possible to prevent the resin protective frame 41 and the outer casing from being melted due to the induction heating of the spring 53.

  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-described embodiment, the induction heating coil 60 is divided into two groups of the first winding group 61 and the second winding group 62, but may be formed into three or more groups. In this case, the elastic support portion 54 may be provided so as to be positioned between the second winding group and the third winding group.

  In the above embodiment, the bottom body 26 is provided with the protruding portion 33 in order to support the lower end of the spring 53 constituting the elastic support portion 54. However, as shown in FIG. May be provided. In this case, as shown in the drawing, it is preferable that a portion of the recess 33 ′ protruding from the bottom surface 27 toward the table T is a contact portion 37. Further, it is preferable that the concave portion 33 ′ has an inner diameter smaller than the inner diameter of the spring 53 and receives an end portion of the spring 53 at the upper end surface.

  Furthermore, in the embodiment, as the elastic support portion 54, the support frame 52 of the spring 53 is provided on the protective frame 41, and the protruding portion 33 (recess 33 ') is provided on the bottom body 26. However, as shown in FIG. The support rib 52 of the spring 53 may be provided on the bottom body 26, and the protruding portion 33 (concave portion 33 ′) may be provided on the protective frame 41.

  Furthermore, in the said embodiment, although the rice cooker was applied and demonstrated as an induction heating cooking appliance, if it is a cooking appliance which induction-heats the inner pot 10 by induction heating, it is applicable.

It is principal part sectional drawing which shows the rice cooker which is the induction heating cooking appliance of embodiment which concerns on this invention. It is a disassembled perspective view which shows the structure of the shoulder body and bottom which comprise an exterior body, and a protection frame. It is a downward perspective view of a protective frame. It is a perspective view which shows the state which assembled | attached the protection frame and the inner trunk | body to the bottom body. It is a perspective view which shows the assembly | attachment state of a bottom body, a protective frame, and a shoulder body. It is sectional drawing which shows the state which took out the inner pot. It is sectional drawing which shows the state which accommodated the inner pot. It is principal part sectional drawing which shows the modification of a rice cooker. It is principal part sectional drawing which shows the other modification of a rice cooker.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Inner pan 10a ... Pan flange part 11 ... Rice cooker main body 12 ... Body (exterior body)
13 ... Shoulder body (exterior body)
25 ... Restriction plate part 26 ... Bottom body (exterior body)
27 ... Bottom 32 ... Plate-shaped guide part 33 ... Projection part 37 ... Contact part 38 ... Inner cylinder 41 ... Protective frame 48 ... Cylindrical guide part 49 ... Tilt restricting part 52 ... Support rib 53 ... Spring 54 ... Elastic support part 58 ... Guide groove part 59 ... Rotation restricting part 60 ... Induction heating coil 61 ... First winding group 62 ... Second winding group 63 ... Non-winding part 65 ... Cover body 66 ... Operating part

Claims (5)

An inner pot accommodating portion having a protective frame made of a non-conductive material is provided inside the exterior body, an induction heating coil is disposed on the outer surface of the protective frame, and an inner pot is opened from an upper end opening of the inner pot accommodating portion. In an induction heating cooker that detachably accommodates and heats the inner pot by the induction heating coil,
The induction heating coil is arranged in an annular shape so as to be located outside the first winding group disposed at the center of the bottom of the inner pot and at a predetermined interval from the outer periphery of the first winding group. Divided into at least two winding groups having the second winding group,
Between the bottom surface of the exterior body and the protective frame, while urging the protective frame upwards and downwards so as to be positioned in a non-winding portion between adjacent winding groups of the induction heating coil, An induction heating cooker comprising an elastic support portion that elastically contracts by placing the inner pot.   The induction heating cooker according to claim 1, wherein the elastic support portion includes a support rib protruding from a bottom surface of the protective frame or the exterior body, and a spring supported by the support rib.   The induction heating cooker according to claim 2, wherein the elastic support portion further includes a protruding portion or a concave portion with which the spring abuts on a bottom surface or a protective frame of the exterior body.   The contact part which protrudes toward the table to mount is provided in the formation position of the elastic support part of the bottom face of the said exterior body, or its vicinity, The said any one of Claim 1 thru | or 3 characterized by the above-mentioned. The induction heating cooker described.   The induction heating cooker according to claim 4, wherein the contact portion is provided so as to project a predetermined gap with respect to the table.

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