JP2019180532A - Cooker - Google Patents

Abstract

To efficiently prevent thermal damage to a pot storage part in a multi-coil type IH system cooker.SOLUTION: A rice cooker 1 includes a bottomed cylindrical pot storage part 131 having a disk-shaped bottom 131a, a cylindrical side 131b, and a curved part 131c for connecting them, a plurality of coils 150 arranged at least outside the bottom 131a and the curved part 131c of the pot storage part 131 separated in a circumferential direction of the pot storage part 131, and a plurality of ferrite holders 160 which store ferrite cores 165 and are arranged close to the pot storage part 131 on a side opposite to the pot storage part 131 with respect to the coils 150, and to which a thermal fuse 167 is attached respectively.SELECTED DRAWING: Figure 9

Description

  The present invention relates to a cooking device.

  An induction heating (IH) type rice cooker can suppress uneven heating and achieve uniform cooking.

  Patent Documents 1 and 2 disclose an IH rice cooker including a plurality of induction heating coils, that is, a multi-coil type IH rice cooker. In this type of rice cooker, local convection occurs in the pan as a result of the local heating of the pan in the area where the individual coils are arranged. Since these curvilinear convections promote stirring of the rice in the pan, more uniform cooking is achieved.

JP-A-5-317172 Japanese Patent Laid-Open No. 5-253058

  In a multi-coil rice cooker, a coil is often attached to a pot housing portion of a non-conductive member. By attaching a coil to a pot accommodating part, a pot accommodating part intervenes between a pot and a coil, and it can prevent that a coil and a pot contact directly. However, when the specified power is supplied to each coil, the temperature rises locally compared to the case where the specified power is supplied to one large coil used in a single coil rice cooker. Cheap. When the temperature rises excessively locally, there is a possibility that the pot accommodating portion is thermally damaged (for example, melted). Therefore, in the multi-coil type rice cooker, it is required to prevent the temperature of the pot housing portion from excessively increasing locally. And since this pan accommodating part can be used not only for a rice cooker but also for other IH type cookers, prevention of thermal damage of the pan accommodating part from the above viewpoint is widely demanded.

  This invention makes it a subject to prevent efficiently the heat damage of a pot accommodating part in the multicoil type IH type cooking appliance.

  The present invention includes a bottomed cylindrical pan housing portion having a disc-shaped bottom portion, a cylindrical side portion, and a curved portion connecting them, and at least the bottom portion and the curved portion outside of the pan housing portion. A plurality of coils spaced apart in the circumferential direction of the pot accommodating portion and a ferrite core are accommodated, and are arranged close to the pot accommodating portion on the opposite side of the pot accommodating portion with respect to the coil. And a plurality of ferrite holders each having a thermal fuse attached thereto.

  According to this structure, since the some coil is arrange | positioned on the bottom part of the pot accommodating part and the outer side of the curved part, the coil is arrange | positioned three-dimensionally instead of a plane. Thus, uneven heating can be suppressed by performing three-dimensional heating. At this time, since the pot accommodating portion can be locally heated, if the temperature of the portion heated due to some trouble is excessively increased locally, the pot accommodating portion may be thermally damaged. However, in the said structure, since the temperature fuse is arrange | positioned adjacent to the pot accommodating part, when the temperature of a pot accommodating part rises more than predetermined, the electricity supply to a coil will be interrupted | blocked by this temperature fuse. Therefore, induction heating is stopped, the temperature of the pan housing part can be prevented from becoming higher than a predetermined level, and thermal damage to the pan housing part can be prevented. In particular, in the above configuration, the magnetic flux from the coil can be converged by providing the ferrite core. Since the thermal fuse is attached to the ferrite holder that accommodates the ferrite core, it is not necessary to newly provide a separate part for attaching the thermal fuse. Furthermore, since the ferrite holder is a member arranged in the vicinity of the pot accommodating portion, the arrangement of the temperature fuse is a suitable arrangement for easily detecting the temperature of the pot accommodating portion. Therefore, it is possible to efficiently prevent thermal damage of the pot housing portion. Note that the “bottom cylindrical shape” of the pot accommodating portion includes not only a strict cylinder but also a tapered shape having a gradient in the side portion. Moreover, a bottom part, a side part, and a curved part are parts divided by a curvature, and each part is not necessarily flat. Further, the curved portion may be a corner portion such as an R portion (fillet portion) that connects the bottom portion and the side portion.

  One said thermal fuse may be provided corresponding to one said coil.

  According to this configuration, since the thermal fuse is provided for each coil, the thermal fuse can be disposed in a portion that is locally heated by each coil. That is, a thermal fuse can be accurately arranged for a portion where the temperature rises, and an excessive temperature rise can be accurately detected. In particular, when energizing each coil in turn, the power can be concentrated and supplied to one coil without being distributed, and therefore the temperature of each coil is likely to rise. Therefore, it is effective to provide a thermal fuse for each coil and detect an excessive temperature rise for each coil.

  All the thermal fuses may be electrically connected in series.

  According to this configuration, when one temperature fuse detects an excessive temperature, energization of all the coils is interrupted. Therefore, safety can be improved.

The ferrite holder has a base and a plurality of extending portions that extend radially from the base and accommodate the ferrite core;
A part of the plurality of extending parts extends along the bottom part of the pot accommodating part, and a part of the plurality of extending parts extends along the side part of the pot accommodating part. It may be.

  According to this structure, since the extension part has extended along the bottom part and the side part centering on the base, a ferrite holder can be arrange | positioned along the three-dimensional shape of a pot accommodating part. Therefore, the magnetic flux from the three-dimensionally arranged coils can be efficiently converged.

  The ferrite holder includes a fuse accommodating portion extending in the same direction adjacent to the extending portion extending along the bottom portion, and the ferrite holder is adjacent to the extending portion extending along the bottom portion in the same direction. And a fuse accommodating portion that accommodates the thermal fuse.

  According to this configuration, since the temperature fuse is arranged along the bottom portion, the temperature of the bottom portion of the pot accommodating portion in particular can be detected. Since the bottom part of the pot accommodating part is a part that is easily heated in the cooking device, it is possible to efficiently detect the temperature rise in the part where the temperature is likely to rise.

  ADVANTAGE OF THE INVENTION According to this invention, in the multicoil type IH type cooking device, the heat damage of a pan accommodating part can be prevented efficiently.

The perspective view from the upper part of the rice cooker which concerns on one Embodiment of this invention. Perspective view from above of rice cooker with lid open The perspective view from the upper part of the rice cooker of the state which took out the pan from the state of FIG. Disassembled perspective view of rice cooker Perspective view of pan receiving member Disassembled perspective view of some internal parts of rice cooker body Perspective view of ferrite holder Partial exploded view of FIG. Bottom view of rice cooker with main casing removed Block diagram showing electrical wiring

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a perspective view from above of a rice cooker (cooker) 1 according to an embodiment of the present invention. FIG. 2 is a perspective view from above of the rice cooker 1 with the lid 200 opened. FIG. 3 is a perspective view from above of the rice cooker 1 with the pan 10 taken out from the state of FIG. 2.

  With reference to FIGS. 1-3, the rice cooker 1 is arrange | positioned rotatably with respect to the rice cooker main body 100 which detachably accommodates the bottomed cylindrical pot 10 which heats rice, and the rice cooker main body 100. As shown in FIG. The lid 200 is provided.

  The lid 200 is rotatably attached to the hinge connection part 121 of the rice cooker main body 100, and closes the opening of the rice cooker main body 100 when closed with respect to the rice cooker main body 100. The lid 200 has an operation unit 210 for operating the rice cooker 1 on the front side and a display unit 220 for displaying the operation status and operation status, and is an outlet of the exhaust passage on the rear side. It has a steam outlet 230. The operation unit 210 includes a plurality of operation buttons 211 and an open button 212. The operation button 211 is a button for switching the operation state of the rice cooker 1, and is, for example, a button for starting rice cooking, a button for canceling the operation, and a power button. The release button 212 is a button for opening the lid 200 that is kept closed by the lock mechanism.

  A U-shaped handle 20 is attached to the side surface of the rice cooker body 100. The handle 20 is adapted to rotate with the mounting portion as a fulcrum.

  As shown in FIGS. 2 and 3, an inner lid 240 that closes the upper end opening 11 of the pan 10 in a closed state is attached to the inside of the lid body 200. The inner lid 240 has a seal member 241 that is in close contact with the inner peripheral portion of the upper end opening 11 of the pan 10 and closes the upper end opening 11. The inner lid 240 is detachably attached to the lid body 200.

  FIG. 4 is an exploded perspective view of the rice cooker 1.

  The rice cooker main body 100 is a box-shaped main body casing 114 having, as an exterior, two opposing side panels 111 and 112 disposed on the side, a front panel 113 disposed on the front, and an opening 114a at the upper end. With. The side panels 111 and 112 and the front panel 113 are attached to both side surfaces and the front surface of the main body casing 114, respectively.

  A shoulder body 120 is attached to the main body casing 114 from above so as to cover the opening 114a. On the rear side of the shoulder body 120, a hinge connection portion 121 for rotatably mounting the lid body 200 is provided. An engagement hole 122 (see FIG. 3) that engages with a locking claw 250 (see FIG. 3) provided in the front portion of the lid 200 is provided on the front side of the shoulder body 120. Below the shoulder body 120, an inner trunk 125 that houses the pan 10 and a pan housing member 130 are disposed. The inner body 125 is a cylindrical shape having a slightly larger diameter than the pot 10 and is made of a metal material.

  FIG. 5 is a perspective view of the pot accommodating member 130.

  The pan accommodating member 130 includes a pan accommodating portion 131 that accommodates the pan 10 and substrate support portions 132 and 133 that support the control substrates 140 and 141. The pot accommodating member 130 (more directly, the pot accommodating part 131) is also called a protective frame and is made of a non-conductive material (for example, a synthetic resin material).

  The pot accommodating part 131 is a bottomed cylindrical shape having a disk-shaped bottom part 131a, a cylindrical side part 131b, and a curved part 131c connecting them. Specifically, the bottom 131a has a circular shape extending substantially flat in the left-right direction. The side part 131b has a substantially cylindrical shape extending in the vertical direction and outward. The curved portion 131c has a curved surface shape that connects the bottom portion 131a and the side portion 131b. The curved portion 131c is provided with a screw hole and a columnar boss 131d extending in the vertical direction.

  The board | substrate support parts 132 and 133 are each provided in the front side and the back side of the pan accommodating part 131. FIG. The control boards 140 and 141 accommodated in the board support parts 132 and 133 control induction heating and the like which will be described later. In particular, the control board 141 is cooled by a fan 142 (see FIG. 4) disposed adjacent thereto.

  A plurality of bracket portions 134 are provided on the upper peripheral edge of the pot accommodating member 130. The bracket portion 134 is used for screw fastening to the shoulder body 120. At the center of the bottom surface of the pot accommodating member 130, a center support portion 135 (shown clearly in FIG. 6) is provided. The central support portion 135 is formed in a substantially cylindrical shape and protrudes downward, and abuts and supports the bottom plate of the main body casing 114 facing the center support portion 135.

  FIG. 6 is an exploded perspective view of some internal components of the rice cooker body 100. 6 is shown upside down with respect to FIGS. Thus, when the rice cooker main body 100 is viewed from below, the pan housing member 130, the coils 150a to 150c, the ferrite holders 160a to 160c, and the reflectors 170a to 170c are arranged to overlap in this order. In FIG. 6, three sets of coils 150a to 150c, ferrite holders 160a to 160c, and reflecting plates 170a to 170c are shown, but one set of coils 150a, ferrite holder 160a, and reflecting plate 170a is disassembled. It is shown. Hereinafter, when it is not necessary to distinguish these, they are also simply referred to as a coil 150, a ferrite holder 160, and a reflector 170, respectively. 4 and 6 schematically show the shape of the coil 150 for the sake of clarity and simplicity. Actually, as will be described later with reference to FIG. 9, the coil 150 has a spiral shape in which a plurality of windings are wound in a donut-shaped region.

  On the outer peripheral surface of the pot accommodating portion 131, an ellipse-shaped coil 150 (specifically, an outer shape elliptical donut shape) is disposed in plan view. In the present embodiment, the three coils 150 a to 150 c are arranged at equal intervals in the circumferential direction along the outer peripheral surface of the pot accommodating portion 131. The coil 150 generates electromagnetic waves when energized with a high-frequency current, thereby induction-heating the pot 10 via the pot accommodating member 130.

  A ferrite holder 160 that houses a ferrite core 165 for converging the magnetic flux from the coil 150 is disposed directly below the coil 150 (upward in FIG. 6). In other words, the coil 150 is disposed in the vicinity of the pot accommodating part 131 on the side opposite to the pot accommodating part 131. Here, the proximity refers to a distance that allows the temperature of the pot accommodating portion 131 to be detected by a temperature fuse 167 described later.

  FIG. 7 is a perspective view of the ferrite holder 160. FIG. 8 is a partially exploded view of FIG.

  Referring also to FIGS. 5 to 8, the ferrite holder 160 has a base portion 161 and four extending portions 162 </ b> A to 162 </ b> D extending radially from the base portion 161. That is, the ferrite holder 160 has a generally cross shape in plan view. Hereinafter, the four extending portions 162 </ b> A to 162 </ b> D are also simply referred to as the extending portions 162 without distinction. Specifically, of the four extension parts 162A to 162D, three extension parts 162A to 162C are arranged along the bottom part 131a of the pot accommodating part 131, and the remaining one extension part 162D is along the side part 131b. Arranged. The two extending parts 162A and 162B extend along the circumferential direction of the pot accommodating part 131, and are arranged so as to hold the elliptical long diameter part of the coil 150 (shown clearly in FIG. 9). The two extending portions 162C and 162D extend along the radial direction of the pot accommodating portion 131, and are arranged so as to press the short diameter portion of the coil 150 (illustrated clearly in FIG. 9). In particular, the extension portion 162 </ b> D is engaged with the engagement portion 136 at the upper part of the pot accommodating member 130.

  The four extending parts 162 include a restriction part 1621 having a concave shape to accommodate the rectangular parallelepiped ferrite core 165, and a leaf spring-like urging part 1622 that urges the ferrite core 165 toward the restriction part 1621. The ferrite cores 165 are accommodated in the slots. In FIG. 8, the ferrite core 165 is removed from the extending part 162 arranged along the side part 131b of the pot accommodating part 131, and the shapes of the ferrite core 165 and the slot are clearly shown. In the present embodiment, the number of the extension parts 162 is four, but the present invention is not limited to this.

  The base 161 is provided with a boss receiver 164 in which a through hole 163 for screw fastening is formed (see FIG. 7). Boss receiver 164 has a concave shape corresponding to the shape of the end of boss 131d so as to receive the end of boss 131d.

  The ferrite holder 160 is provided with a fuse accommodating portion 166 extending in the same direction adjacent to the extending portion 162 extending along the bottom portion 131 a of the pot accommodating portion 131. The fuse housing portion 166 has a concave shape, and a cylindrical temperature fuse 167 is housed in the fuse housing portion 166. In FIG. 8, the thermal fuse 167 is removed from the fuse housing portion 166, and the shapes of the thermal fuse 167 and the fuse housing portion 166 are clearly shown. The fuse accommodating portion 166 has a notch portion 166a with a notch cut out for passing an electric wiring (not shown) of the temperature fuse 167, and a side portion for facilitating the removal of the temperature fuse 167 into a fingertip size. And a notched portion 166b. A rib 166 c that press-contacts the thermal fuse 167 is provided on the concave inner surface of the fuse housing portion 166.

  Referring to FIG. 6 again, a reflector 170 for suppressing the high frequency magnetic field generated from the coil 150 from adversely affecting peripheral devices is disposed directly below the ferrite holder 160 (upward in FIG. 6). . The reflection plate 170 has an integral structure formed by bending one sheet metal. The material of the reflecting plate 170 is copper, aluminum, or the like having a lower electrical resistance value than the pan 10.

  The reflection plate 170 has a bottom plate 171 disposed opposite to the bottom portion 131a of the pot accommodating portion 131, a side plate 172 disposed opposite to the side portion 131b, and a continuous portion 173 connecting them. . Each of the bottom plate 171 and the side plate 172 is a substantially semi-elliptical flat plate. The elliptical curvature is substantially the same as the elliptical curvature of the corresponding coil 150. An opening 173 a having a shape corresponding to the inner shape of the coil 150 is provided at the center of the continuous portion 173. The opening 173a is formed by punching the bottom plate 171 and the side plate 172, and a screw fastening portion 173c is bridged at the center thereof. Accordingly, the opening 173a has two openings separated by the screw fastening portion 173c. The screw fastening portion 173 c is a portion where the bottom plate 171 extends to the continuous portion 173. A screw hole 173d for screw fastening is provided in the screw fastening portion 173c. The continuous portion 173 is provided with two step portions 173b so as to sandwich the opening 173a. The step portion 173 b is formed so as to approach the coil 150 when assembled, that is, has a convex step shape toward the coil 150.

  FIG. 9 is a bottom view of the rice cooker 1 with the main body casing 114 removed. More specifically, FIG. 9 shows a state where the reflector 170 is also removed.

  In the state where the rice cooker main body 100 is assembled, the position of the coil 150 is fixed by sandwiching the coil 150 between the ferrite holder 160 and the pot accommodating portion 131. In the present embodiment, the boss 131d, the screw hole 173d of the reflecting plate 170, and the through-hole 163 of the ferrite holder 160 are shared while the boss 131d of the pot accommodating portion 131 is received in the boss receiver 164 of the ferrite holder 160. It is tightened and each is fixed.

  In the present embodiment, one ferrite holder 160 and one reflector 170 are provided for one coil 150, respectively. In the present embodiment, three sets of such an assembly including the coil 150, the ferrite holder 160, and the reflection plate 170 are provided. In the assembly, one thermal fuse 167 is provided corresponding to one coil 150, and the thermal fuse 167 is disposed between the coil 150 and the reflection plate 170.

  The coil 150 is disposed outside the bottom 131a, the side 131b, and the curved portion 131c of the pot accommodating portion 131. Specifically, the coil 150 is in contact with the bottom surface 131a, the side portion 131b, and the outer surface of the curved portion 131c of the pan accommodating portion 131. From the viewpoint of encouraging convection during rice cooking, the coil 150 is preferably disposed at least outside the bottom 131a and the curved portion 131c of the pan accommodating portion 131, that is, at least the bottom 131a and the curved portion 131c of the pan accommodating portion 131. It is preferable to be in contact with the outer surface.

  Coil 150 is electrically connected to control boards 140 and 141 for energization and control, respectively. Specifically, on the front side of the rice cooker 1, the coil 150 b is electrically connected to the control board 140, and on the rear side, the coils 150 a and 150 c are electrically connected to the control board 141. This electrical connection is a parallel connection, and the coils 150a to 150c can be energized independently.

  Along with the coils 150a to 150c, three thermal fuses 167 are also electrically connected to the control board 141. However, unlike the coils 150a to 150c, all the thermal fuses 167 are electrically connected in series (see the broken line in FIG. 9). In addition, the electrical wiring shown with a broken line is shown typically and may differ from an actual connection mode. Actually, it is preferable that the wiring is provided so as not to interfere with other parts by being hooked or wound around the peripheral edge of the pan accommodating member 130.

  FIG. 10 is a block diagram showing the electrical wiring of the rice cooker 1.

  The control boards 140 and 141 of the rice cooker 1 function as a control device. This control device includes an IH circuit 143 and a switching unit 144. The IH circuit 143 is a part that supplies predetermined power (high-frequency current) to the coil 150. The switching unit 144 is a part that switches energization to each of the coils 150a to 150c as described in detail below, and may be, for example, a microcomputer. Further, the switching unit 144 may be provided on a substrate having a display unit. In the present embodiment, the switching unit 144 can perform switching so that, for example, one of the three coils 150 is energized and the rest is cut off. Three thermal fuses 167 and a power supply unit 145 are interposed in an electric connection extending from the IH circuit 143 to the switching unit 144 in a serial connection manner. Therefore, if even one of the three thermal fuses 167 is cut off, the energization of all the coils 150a to 150c is cut off.

  In the series connection of the thermal fuses 167, an electronic component such as a substrate may be interposed between the thermal fuses 167. The energization of the coils 150 a to 150 c may be interrupted by interrupting the energization of the switching unit 144, or may be performed by interrupting the energization of the IH circuit 143.

  In the present embodiment, control is performed so that a high-frequency current is supplied from the control boards 140 and 141 to the coil 150 at an appropriate timing as follows.

  With reference to FIG. 6, for example, when a high-frequency current is applied only to the coil 150a, a wide region in the vertical direction (vertical direction) from the bottom surface to the side surface of the pan 10 (see FIG. 4) corresponding to the coil 150a is obtained. Partially induction heated. When the heating region is intensively heated, large convection in the vertical direction occurs in the heating region in the pan 10. A large stirring effect is obtained by large convection in the vertical direction, and umami components (elution sugar content and the like) contained in the cooked rice can be extracted during cooking. In order to heat the heating region in a concentrated manner, it is preferable to energize at least about 0.5 seconds, depending on the heating output of the coil 150. For example, only the coil 150a is energized for 0.5 to 30 seconds.

  Similarly, when a high-frequency current is applied only to the coil 150b over the above time, a wide region in the vertical direction (vertical direction) from the bottom surface portion to the side surface portion of the pot 10 corresponding to the coil 150b is partially induction heated, Large convection in the vertical direction occurs in the heating region in the pan 10. In addition, when a high-frequency current is applied only to the coil 150c for the above time, a wide area in the vertical direction (vertical direction) from the bottom surface portion to the side surface portion of the pan 10 corresponding to the coil 150c is partially induction heated, and the pan A large convection in the vertical direction occurs in the heating region within 10.

  Thus, for example, when only the coil 150a is energized and the other coils 150b and 150c are de-energized, the vertical direction (longitudinal direction) from the bottom surface portion to the side surface portion of the pan 10 corresponding to the energized coil 150a. A large area is partially induction-heated, and large convection in the vertical direction occurs in the heating area in the pan 10. That is, the temperature difference between the partially heated region due to energization and the non-heated region due to non-energization becomes large and large convection occurs, so that a large stirring effect can be obtained.

  Next, when only the coil 150b located next to the coil 150a is energized and the other coils 150a and 150c are de-energized, the vertical direction from the bottom surface portion to the side surface portion of the pan 10 corresponding to the energized coil 150b. A large area in the (longitudinal direction) is partially induction-heated, and large convection in the vertical direction occurs in the heating area in the pan 10. Further, when only the coil 150c located next to the coil 150b is energized and the other coils 150a and 150b are de-energized, the vertical direction from the bottom surface portion to the side surface portion of the pan 10 corresponding to the energized coil 150c ( A large area in the vertical direction is partially induction-heated, and large convection in the vertical direction occurs in the heating area in the pot 10.

  Therefore, after energizing a certain coil among the plurality of coils 150, it can be controlled to sequentially energize other coils located adjacent to the certain coil and de-energize other coils. According to the control, the large vertical convection due to partial heating sequentially moves in the circumferential direction of the pan 10, and the convection in which the vertical convection and the circumferential convection are combined is generated in the pan 10. be able to. Due to the combined convection, it is possible to further extract umami components (elution sugar content, etc.) contained in the cooked rice during cooking.

  According to the rice cooker 1 of this embodiment, there are the following merits.

  Since the plurality of coils 150 are arranged outside the bottom portion 131a and the curved portion 131c of the pot accommodating portion 131, the coils 150 are arranged three-dimensionally instead of in a plane. Thus, uneven heating can be suppressed by performing three-dimensional heating. At this time, since the pot accommodating part 131 can be heated locally, if the temperature of the part heated by some malfunction excessively rises locally, the pot accommodating part 131 may be thermally damaged. However, in the above configuration, the temperature fuse 167 is disposed in the vicinity of the pot accommodating portion 131. Therefore, when the temperature of the pot accommodating portion 131 rises to a predetermined level or higher, the energization of the coil 150 is interrupted by the temperature fuse 167. The Therefore, induction heating is stopped, the temperature of the pot accommodating part 131 can be prevented from becoming higher than a predetermined level, and thermal damage to the pot accommodating part 131 can be prevented. In particular, in the above configuration, the ferrite core 165 is provided, so that the magnetic flux from the coil 150 can be converged. Since the temperature fuse 167 is attached to the ferrite holder 160 that accommodates the ferrite core 165, it is not necessary to newly provide another part for attaching the temperature fuse 167. Further, since the ferrite holder 160 is a member disposed in the vicinity of the pot accommodating portion 131, the arrangement of the temperature fuse 167 is a suitable arrangement for easily detecting the temperature of the pot accommodating portion 131. Therefore, the heat damage of the pot accommodating part 131 can be prevented efficiently.

  Since the rice cooker 1 includes the switching unit 144 that switches the energized state in a predetermined order so that one of the plurality of coils 150 is energized and the rest is cut off, the switching unit 144 distributes the power. Therefore, it can be concentrated and supplied to one coil 150. Since the electric power supplied to one coil 150 can be increased, the local area can be heated more strongly than the single coil rice cooker, while the heating amount per unit area of the coil 150 is increased. Therefore, the temperature of the coil 150 is likely to rise locally, increasing the risk of the pan housing part 131 being thermally damaged. On the other hand, in this embodiment, since the temperature fuse 167 is disposed in the vicinity of the pot accommodating portion 131, thermal damage to the pot accommodating portion 131 can be prevented.

  A thermal fuse 167 is provided for each coil 150, that is, the thermal fuse 167 is arranged for a portion that is locally heated by each coil 150. Therefore, the thermal fuse 167 can be accurately disposed in the portion where the temperature rises, and an excessive temperature rise can be accurately detected. In particular, since the switching unit 144 is provided, the temperature of each coil 150 is likely to rise as described above, and it is effective to provide a thermal fuse 167 for each coil 150 and detect an excessive temperature rise for each coil 150.

  Since all the temperature fuses 167 are electrically connected in series, when one temperature fuse 167 detects an excessive temperature, the energization of all the coils 150 is cut off. Therefore, safety can be improved.

  Since the extending part 162 extends along the bottom part 131a and the side part 131b with the base part 161 as the center, the ferrite holder 160 can be arranged along the three-dimensional shape of the pot accommodating part 131. Accordingly, the magnetic flux from the three-dimensionally arranged coils 150 can be efficiently converged.

  Since the temperature fuse 167 is disposed along the bottom portion 131a, the temperature of the bottom portion 131a of the pot accommodating portion 131 can be detected. Since the bottom part 131a of the pot accommodating part 131 is a part which is easy to be heated in the rice cooker 1, the temperature rise of the part which is easy to rise in temperature can be detected efficiently.

  As mentioned above, although specific embodiment of this invention was described, this invention is not limited to the said form, It can implement in various changes within the scope of this invention.

  For example, although the case where the number of the coils 150 is three is shown in the above embodiment, the number of the coils 150 is not particularly limited, and may be two or more.

  Moreover, in the said embodiment, although the rice cooker 1 which cooks rice as an example of a cooker is mentioned and demonstrated, this invention is not limited to the rice cooker 1, For example, other to-be-cooked objects (for example, beef) The present invention can also be applied to a cooker that cooks by cooking a stewed food such as a stew or cream stew, and can exhibit the same actions and effects.

1 Rice cooker (cooker)
DESCRIPTION OF SYMBOLS 10 Pan 11 Upper end opening 20 Handle 100 Rice cooker main body 111,112 Side panel 113 Front panel 114 Main body casing 114a Opening part 120 Shoulder body 121 Hinge connection part 122 Engagement hole 125 Inner trunk 130 Pot accommodation member 131 Pot accommodation part (protection frame) )
131a bottom part 131b side part 131c curved part 131d boss 132,133 board support part 134 bracket part 135 central support part 136 engaging part 140,141 control board 142 fan 143 IH circuit 144 switching part 145 power supply part 150,150a, 150b, 150c Coil 160, 160a, 160b, 160c Ferrite holder 161 Base 162, 162A, 162B, 162C, 162D Extension part 1621 Restriction part 1622 Energizing part 163 Through hole 164 Boss receiver 165 Ferrite core 166 Fuse accommodating part 166a, 166b Notch part 166c Rib 167 Thermal fuse 170, 170a, 170b, 170c Reflector 171 Bottom plate 172 Side plate 173 Continuous portion 173a Opening portion 173b Stepped portion 173b1 First portion 173b The second portion 173c screw fastening portion 173d screw hole 200 lid 210 operation unit 211 an operation button 212 release button 220 display unit 230 vapor outlet 240 in the lid 241 sealing member 250 locking pawl

Claims (5)

A bottomed cylindrical pan receiving portion having a bottom portion, a side portion, and a curved portion connecting them;
A plurality of coils arranged at a distance from each other in the circumferential direction of the pot accommodating portion, at least on the bottom of the pot accommodating portion and outside the curved portion;
A cooking device comprising: a plurality of ferrite holders that house a ferrite core, are disposed in proximity to the pan housing portion on the side opposite to the pan housing portion with respect to the coil, and are each attached with a temperature fuse.   The cooker according to claim 1, wherein one of the thermal fuses is provided corresponding to one of the coils.   The cooker according to claim 1 or 2, wherein all the thermal fuses are electrically connected in series. The ferrite holder has a base and a plurality of extending portions that extend radially from the base and accommodate the ferrite core;
A part of the plurality of extending parts extends along the bottom part of the pot accommodating part, and a part of the plurality of extending parts extends along the side part of the pot accommodating part. The cooking device according to any one of claims 1 to 3.   The cooker according to claim 4, wherein the ferrite holder further includes a fuse housing portion that extends in the same direction adjacent to the extending portion that extends along the bottom portion and houses the thermal fuse.

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