JP6248744B2 - Induction heating rice cooker - Google Patents

Description

  The present invention relates to a rice cooker mainly used at home, and more particularly to an induction heating rice cooker that cooks rice by induction heating.

  For example, aluminum material with good thermal conductivity and workability has been used for the inner pot of rice cookers, but in recent years, the mainstream heating method of rice cookers has become the induction heating system, so that the inner pot can also be induction heated. An inner hook made of a magnetic material is used instead of an inner hook made of aluminum alone, which is a magnetic material.

Conventionally, induction heating provided with an inner pot that has been processed to make it easy to convect water and rice to be cooked so that rice can be cooked evenly with an inner pot using such a magnetic material Rice cookers have been proposed (see, for example, Patent Document 1 and Patent Document 2).

JP 2001-137108 A (2nd page, FIG. 1) JP 2003-79516 A (Page 3, FIG. 1)

  The conventional induction heating rice cooker described in Patent Document 1 is provided with a plurality of convex portions at the bottom of the inner pot, and the convex portions are heated more strongly by approaching the induction heating coil than the bottom plane, Not only the convection of the upper layer part and the lower layer part but also a temperature difference is caused in the radial direction to promote the convection.

  Moreover, the conventional induction heating rice cooker described in Patent Document 2 uses an inner pot formed of a clad material which is a dissimilar metal bonding material of a nonmagnetic metal and a magnetic metal, and a plurality of pots are provided at the inner pot bottom. By providing the concavo-convex shape, the magnetic lines of force concentrate on the convex shape, resulting in a temperature difference from the concave shape, and a large number of fine convections are generated so that the convection becomes active.

  However, in the conventional induction heating rice cooker described in Patent Document 1, a concave portion is formed on the inner surface of the inner bottom of the inner pot corresponding to the convex portion of the outer surface of the bottom, so that smooth convection is inhibited and the gelatinization of rice When the water begins to become sticky, partial convection occurs, but overall convection hardly occurs, and there is a problem that uniform heating becomes difficult.

In addition, in the conventional induction heating rice cooker described in Patent Document 2, when the concavo-convex shape is applied to the flat plate material before being processed into the inner pot shape by pressing, the position of the concavo-convex shape is shifted when processed into the inner pot shape. It has to be processed so as not to occur, and there is a problem that workability is poor.

In addition, the unevenness of the clad material is applied to the clad material by press working, which damages the part where dissimilar metals are bonded by rolling. There is also a problem that it sometimes deforms.

Then, in the conventional induction heating rice cooker described in Patent Document 1 and Patent Document 2, the convex portion and the convex shape that are close to the induction heating coil are strongly heated, but the thickness of the bottom portion of the inner pot is uniform. For this reason, the temperature at the bottom of the inner pot becomes uniform immediately and there is no temperature difference, so that convection is less likely to occur, which makes it difficult to perform uniform heating.

  The present invention has been made to solve the above-described problems, and provides an induction heating rice cooker having an inner pot with good workability that can promote convection during rice cooking to uniformly heat rice. With the goal.

An induction heating rice cooker according to the present invention that solves the problems is provided in a main body, an inner pot that is detachably stored in an inner pot storage section provided in the main body, and a lower portion of the inner pot storage section in the main body. an induction heating coil, and a inverter board for supplying power to the induction heating coil, the bobbin is formed of a dissimilar metal bonding material made of a nonmagnetic metal and a magnetic metal, the inner hook outer surface is made of magnetic metal, the press It is formed into a cylindrical shape with a bottom by processing, and after pressing, a magnetic member made of a separate magnetic metal is protruded from the outer surface of the inner hook and joined to the bottom of the inner hook by welding .

  According to the induction heating rice cooker according to the present invention, the inner pot is formed of a dissimilar metal bonding material made of a non-magnetic metal and a magnetic metal, and a magnetic member made of a separate magnetic metal is provided on the bottom of the outer surface of the inner wall of the magnetic metal. Since the magnetic member made of a separate magnetic metal approaches the induction heating coil and is strongly heated without impairing the smoothness of the inner surface of the inner hook, the portion where the magnetic member is bonded increases in thickness. Since the temperature difference from the portion where the magnetic member is not joined can be maintained, convection is continuously promoted.

Furthermore, since a magnetic member made of a separate magnetic metal is joined to the bottom of the outer surface of the inner pot, the inner pot is deformed during heating because of good workability and no damage to the dissimilar metal bonding material. There is nothing.

It is a perspective view which shows schematic structure of the induction heating rice cooker which concerns on Embodiment 1 of this invention. It is a perspective view of the state which opened the cover which shows schematic structure of the induction heating rice cooker which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the internal structure of the induction heating rice cooker which concerns on Embodiment 1 of this invention. (A) The schematic which looked at one example of the shape of the induction heating coil of the induction heating rice cooker which concerns on Embodiment 1 of this invention from the upper part, (b) Induction of the induction heating rice cooker which concerns on Embodiment 1 of this invention It is the schematic which looked at the other example of the shape of a heating coil from upper direction. (A) Sectional drawing which cut | disconnected the inner pot of the induction heating rice cooker which concerns on Embodiment 1 of this invention by the line | wire which passes along a center, (b) The inner pot of the induction heating rice cooker which concerns on Embodiment 1 of this invention The figure which looked at the outer surface bottom part side, (c) It is an enlarged view of a magnetic member. It is the figure which looked at the inner pot of the induction heating rice cooker which concerns on Embodiment 2 of this invention from the outer surface bottom part side. It is the figure which looked at the inner pot of the induction heating rice cooker which concerns on Embodiment 3 of this invention from the outer surface bottom part side. It is the elements on larger scale of the state which attached the elastic member to the magnetic member of the inner pot of the induction heating rice cooker which concerns on Embodiment 4 of this invention.

Embodiment 1 FIG.
(Overall configuration)
FIG. 1 is a perspective view showing a schematic configuration of an induction heating rice cooker according to Embodiment 1 of the present invention, and FIG. 2 is an opened lid showing a schematic configuration of the induction heating rice cooker according to Embodiment 1 of the present invention. FIG. 3 is a sectional view showing the internal configuration of the induction heating rice cooker according to Embodiment 1 of the present invention, and FIG. 4A is the induction of the induction heating rice cooker according to Embodiment 1 of the present invention. FIG. 4 (b) is a schematic view of another example of the shape of the induction heating coil of the induction heating rice cooker according to Embodiment 1 of the present invention. is there. The schematic overall configuration of the induction heating rice cooker according to Embodiment 1 of the present invention will be described with reference to FIGS.

  As shown in FIG. 1, reference numeral 100 denotes an induction heating rice cooker according to Embodiment 1 of the present invention, which includes a main body 1 and a lid 2. The main body 1 and the lid body 2 are each made of a resin material according to the application, and are formed by resin molding, for example. However, the body 1 and the lid body 2 are not necessarily limited to the resin material. May be used.

  As shown in FIG. 1, the lid 2 has a lid upper surface cover 2 a, and a transparent display window 4 is provided on the upper lid upper surface cover 2 a near the front of the lid 2. The display window 4 is for visually recognizing the display content of a display panel (not shown) for displaying operation results and operation statuses.

In order to operate the rice cooker 100, an operation unit 3 having various operation keys (not shown in detail) each having functions such as rice cooking, heat insulation, and reservation is provided around the display window 4. It is possible to operate while viewing the display contents on the display panel.

Further, an exhaust port 2b for discharging steam generated during rice cooking is provided near the rear of the lid 2. In addition, in Embodiment 1 of this invention, although the induction heating rice cooker of the type which discharges | emits steam outside a main body is demonstrated, the induction heating rice cooker of the type which does not discharge | emit steam outside a main body may be sufficient, In that case There is no steam outlet.

  As shown in FIG. 2, a locking portion 5 a is provided in front of the upper surface of the main body, and an engaging portion (not shown) provided on the lid body 2 is engaged with the locking portion 5 a, so that the lid body 2 is connected to the main body 1. The top surface of is closed. The lid body 2 is a pivot shaft (not shown) provided in the hinge portion 8, and a rear end portion thereof is pivotally fixed.

The lid 2 is disengaged between the engaging portion (not shown) and the engaging portion 5a by pushing in an unlocking button 5 provided in front of the main body 1, and is opened in the opening direction around the rotation axis. It is rotated to a predetermined position and released by a biasing means (not shown) that applies a biasing force to the lid body 2.

  As shown in FIG. 2, an opening is provided at the center of the main body, and this opening is detachably accommodated with an inner pot 6 for storing water and rice as a cooked rice in the inner pot storage section. An inner lid 7 is provided on the surface of the lid 2 facing the inner hook 6, and is provided on the outer periphery of the inner lid 7 with a flange 6 a provided on the upper peripheral edge of the inner hook 6 in a state where the lid 2 is closed. The seal packing 7a thus made is brought into contact with the entire circumference and sealed.

The inner lid 7 is detachably mounted with a cartridge 7b provided to return the umami component generated during cooking from the cooked rice in the inner pot 6 to the inner pot 6. The cartridge 7b is also provided with a communication port 2c for discharging steam generated during cooking from the cooked rice in the inner pot 6 to the outside. The communication port 2c communicates with the exhaust port 2b.

As shown in FIG. 3, the main body 1 is provided with induction heating coils 10a, 10b and 10c which are heating means for heating the inner pot 6 and cooking the stored rice.
In the first embodiment, the induction heating coil is described as an annular coil shape that is divided into a plurality of pieces as shown in FIG. 4A. However, the present invention is not limited to this, and FIG. An induction heating coil 50 having one annular coil shape that is not divided may be used.

  A body heater 13 is provided so as to surround the body portion of the inner hook 6. The body heater 13 is energized during rice cooking and heat retention, and is used for temperature adjustment of rice cooking and heat insulation.

  Inside the heating coil 10a, a temperature sensor 11 is provided so as to be in contact with the outer central portion of the inner pot 6. The temperature sensor 11 detects the temperature of the inner pot 6 during rice cooking and is used for rice cooking control.

  A control board 9 is provided in a space on the rear (rear) side of the main body 1. On the control board 9, a power supply circuit (not shown), a microcomputer, an inverter circuit for supplying a high-frequency current to the induction heating coils 10a, 10b, and 10c based on the control of the microcomputer, a memory, and the like are mounted. The memory stores a control program for operating the microcomputer in response to an operation by the operation key of the operation unit 3 described above.

  A bottom plate 14 made of a resin material and formed by resin molding is provided at the lower portion of the main body 1, and a cooling fan 12 for cooling the control board 9 and the induction heating coils 10a, 10b, and 10c is attached. . The bottom plate 14 is provided with a winding type power cord (not shown).

The cooling fan 12 is disposed below the control board 9, operates when rice cooking is started, and sucks outside air from an intake hole (not shown) provided in the bottom plate 14, and the control board 9 and induction heating coils 10a, 10b, 10c. It is designed to blow and cool down.

  The induction heating coils 10a, 10b, and 10c are heating means for heating the inner pot 6 and cooking the stored rice as described above. When a high-frequency current that is rectified by a commercial power source with an inverter circuit is passed through the induction heating coils 10a, 10b, and 10c, a magnetic line of force (also referred to as an alternating magnetic field) is generated. Eddy current flows.

When an eddy current flows through the magnetic metal, Joule heat is generated by the electric resistance of the metal and the magnetic metal itself generates heat, which is a heating method called induction heating.

Magnetic field lines generated in the induction heating coils 10a, 10b, and 10c are generated in the vertical direction of the coils. The magnetic field lines generated on the upper side heat the inner hook 6, but the magnetic field lines generated on the lower side leak to the bottom plate 14 side and are lost. Therefore, in order to prevent leakage of the magnetic lines of force generated on the lower side, a magnetic body 15 is provided below the induction heating coils 10a, 10b, and 10c as shown in FIG.

The magnetic body 15 has a thin rectangular shape and is made of ferrite. Ferrite is a complex oxide of iron oxide and metal and is also called magnetic ceramics. Since it is ferromagnetic and ceramics, its conductivity is low, so it is effective in preventing leakage of magnetic force.

The magnetic bodies 15 are preferably arranged so as to be parallel to the direction of the generated magnetic lines of force, and are arranged radially from the inside to the outside. The same applies to the induction heating coil 50 having one annular coil shape as shown in FIG.
By arranging the magnetic body 15 in this way, leakage of the magnetic lines generated on the lower side can be prevented, thereby increasing the magnetic lines directed upward and increasing the force for heating the inner hook 6.

(Structure of inner pot)
The heating target of the induction heating coils 10a, 10b, and 10c is the inner hook 6, and the configuration of the inner hook 6 will be described with reference to FIG. FIG. 5A is a cross-sectional view of the inner pot of the induction heating rice cooker according to the first embodiment of the present invention cut along a line passing through the center, and FIG. 5B is the induction according to the first embodiment of the present invention. The figure which looked at the inner pot of the heating rice cooker from the outer surface bottom side, FIG.5 (c) is an enlarged view of a magnetic member.

  As shown in FIG. 5 (a), the inner hook 6 has a bottomed cylindrical shape with an open top, and a magnetic metal 22 and a nonmagnetic metal 23 are bonded together as shown in FIG. 5 (c). The clad material, which is a material, is formed by deep drawing by press working. For example, stainless steel is used as the magnetic metal, and aluminum is used as the nonmagnetic metal.

The inner pot 6 is processed into a cylindrical shape so that the outer surface close to the induction heating coils 10a, 10b, and 10c becomes the magnetic metal 22 and the inner surface that accommodates water and rice as the cooked rice becomes the nonmagnetic metal 23. The surface of the inner surface is provided with a fluororesin coat 24 for suppressing sticking of cooked rice.

  In addition, a plurality of cylindrically-shaped magnetic members 20 having the same circumference (area) are radially joined from the inside to the outside at the bottom of the outer surface of the inner hook 6. The magnetic member 20 is a separate member from the inner hook 6 to be pressed, and is joined to the inner hook 6 after being pressed. Therefore, the clad material, which is a bonding material of different metals, is not partially protruded by pressing or the like, so that the bonding position of the different metals is not damaged.

The magnetic members 20 may all have the same height. However, if the bottom of the inner hook 6 is not a single plane and the heights are different between the inside and the outside, the magnetic member 20 is adjusted to the height difference. You may change the height. By doing so, it can be placed stably on the kitchen countertop or tabletop.

An example of joining of the magnetic member 20 is spot welding. Spot welding is a relatively easy method. When electricity is passed between materials, resistance heat is generated and the materials are melted and joined.
Note that spot welding is an example, and arc welding, laser welding, or the like may be used, and the welding means is not particularly limited. However, it is desirable that welding can be performed with as little gap as possible.

The magnetic member 20 is joined to a position facing the induction heating coils 10a, 10b, and 10c, and protrudes from the bottom of the outer surface of the inner hook 6, so that the magnetic member 20 comes closer to the induction heating coils 10a, 10b, and 10c. . When spot welding is performed on the surface of the magnetic member 20, an indentation 21 (see FIG. 5C) due to a welding electrode is generated, and the portion is further close to the induction heating coils 10 a, 10 b, and 10 c.

The lines of magnetic force generated by the induction heating coils 10a, 10b, and 10c tend to gather at locations that protrude close to the induction heating coils 10a, 10b, and 10c, and more eddy current flows to the locations, causing strong heat generation.

Therefore, the location where the magnetic member 20 is joined at the time of rice cooking quickly generates heat, a temperature difference occurs between the location where the magnetic member 20 is joined and the location where it is not joined, and the location where the inner bottom surface of the inner pot heats up quickly. Bubbles are generated, and the bubbles rise and rupture, thereby generating convection in water and rice that are to-be-cooked rice.

Further, the location where the magnetic member 20 is joined is the sum of the thickness of the inner hook 6 and the thickness of the magnetic member 20, and the volume of the metal is increased, so that the location where the magnetic member 20 is not joined is compared. Since the heat capacity is increased and the temperature difference is maintained, the difference in bubble generation due to the temperature difference is also maintained, and convection is further promoted. By this, the whole is heated uniformly and it becomes possible to perform rice cooking with little cooking unevenness.

Then, as described above, the location where the magnetic body 15 is arranged has a strong force to heat the inner pot 6 by suppressing the leakage of the lines of magnetic force. The heating power can be further improved by matching the arrangement positions of the magnetic member 20 and the magnetic member 20. In this case, it is desirable to provide alignment between the inner hook 6 and the inner hook storage portion so that the arrangement position of the magnetic body 15 and the arrangement position of the magnetic member 20 do not deviate.

In the embodiment of the present invention, the magnetic members are joined. However, as a method of partially increasing the thickness, there is a method of spraying (also referred to as spraying) a metal which is a magnetic member melted at a high temperature to the inner pot. However, when a specific shape is required, it is necessary to process after spraying. Therefore, compared to the method of welding a separate magnetic member, the labor and cost required for post-processing are increased, so that the parts are joined by welding. It is desirable.

Embodiment 2. FIG.
The induction heating rice cooker according to the second embodiment of the present invention is different from the induction heating rice cooker according to the first embodiment of the present invention in the form of the inner pot, and other than that, the induction according to the first embodiment of the present invention. It is the same as a heated rice cooker.

Therefore, FIG. 6 demonstrates the inner pot of the induction heating rice cooker which concerns on Embodiment 2 of this invention, and abbreviate | omits description other than that.
FIG. 6 is a view of the inner pot of the induction heating rice cooker according to the second embodiment of the present invention as seen from the outer bottom side.

  As shown in FIG. 6, magnetic members 30 a, 30 b, and 30 c that are annular and have different diameters are joined to the bottom of the outer surface of the inner hook 6 at positions facing the induction heating coils 10 a, 10 b, and 10 c. Although a triple ring is used here, it may be double or quadruple as long as it is provided at a position facing the induction heating coils 10a, 10b, and 10c, and can be set as appropriate.

  The magnetic members 30a, 30b, and 30c are separate members from the inner hook 6 to be pressed, and are joined to the inner hook 6 after being pressed. Therefore, the clad material, which is a bonding material of different metals, is not partially protruded by pressing or the like, so that the bonding position of the different metals is not damaged.

The magnetic members 30a, 30b, and 30c may all have the same height. However, if the bottom of the inner hook 6 is not a single plane and the height is different between the inside and the outside, the height difference is adjusted accordingly. Not only the diameter but also the height of the magnetic members 40a, 40b, and 40c may be changed. By doing so, it can be placed stably on the kitchen countertop or tabletop.

Then, although not shown, the magnetic members 30a, 30b, 30c protrude from the bottom of the outer surface of the inner hook 6, so that they come closer to the induction heating coils 10a, 10b, 10c.

The lines of magnetic force generated by the induction heating coils 10a, 10b, and 10c tend to gather at locations that protrude close to the induction heating coils 10a, 10b, and 10c, and more eddy current flows to the locations, causing strong heat generation.

Therefore, the portion where the magnetic members 30a, 30b, 30c are joined quickly generates heat, and a temperature difference occurs between the place where the magnetic members 30a, 30b, 30c are joined and the place where the magnetic members 30a, 30b, 30c are joined. Bubbles are generated from the place where the bottom is heated quickly, and the bubbles rise and rupture, thereby generating convection in water and rice that are to-be-cooked rice.

Further, the location where the magnetic members 30a, 30b and 30c are joined is a thickness obtained by adding the thickness of the inner hook 6 and the thickness of the magnetic members 30a, 30b and 30c, and the volume of the metal is increased. The heat capacity is increased compared to the portion where 30b and 30c are not joined, and the difference in the bubble generation due to the temperature difference is maintained due to the temperature difference being maintained, thereby further promoting convection. By this, the whole is heated uniformly and it becomes possible to perform rice cooking with little cooking unevenness.

Embodiment 3 FIG.
The induction heating rice cooker according to the third embodiment of the present invention is different from the induction heating rice cooker according to the first embodiment of the present invention and the second embodiment of the present invention in the form of the inner pot. It is the same as that of the induction heating rice cooker which concerns on Embodiment 1 of this invention and Embodiment 2 of this invention.

Therefore, FIG. 7 demonstrates the inner pot of the induction heating rice cooker which concerns on Embodiment 3 of this invention, and abbreviate | omits description other than that.
FIG. 7: is the figure which looked at the inner pot of the induction heating rice cooker which concerns on Embodiment 3 of this invention from the outer surface bottom part side.

  As shown in FIG. 7, magnetic members 40 a, 40 b, and 40 c having a cylindrical convex shape and different circumferences (areas) are provided from the inner side at positions facing the induction heating coils 10 a, 10 b, and 10 c at the bottom of the outer surface of the inner pot 6. It is joined radially so as to become smaller toward the outside.

  The magnetic members 40a, 40b, and 40c are separate members from the inner hook 6 to be pressed, and are joined to the inner hook 6 after being pressed. Therefore, the clad material, which is a bonding material of different metals, is not partially protruded by pressing or the like, so that the bonding position of the different metals is not damaged.

The magnetic members 40a, 40b, and 40c may all have the same height. However, if the bottom portion of the inner hook 6 is not a single plane and the height differs between the inside and the outside, the height difference is adjusted accordingly. Not only the circumference (area) but also the height of the magnetic members 40a, 40b, 40c may be changed. By doing so, it can be placed stably on the kitchen countertop or tabletop.

Then, although not shown, since the magnetic members 40a, 40b, and 40c protrude from the bottom of the outer surface of the inner hook 6, they come closer to the induction heating coils 10a, 10b, and 10c.

The lines of magnetic force generated by the induction heating coils 10a, 10b, and 10c tend to gather at locations that protrude close to the induction heating coils 10a, 10b, and 10c, and more eddy current flows to the locations, causing strong heat generation.

Therefore, the portion where the magnetic members 40a, 40b, 40c are joined at the time of rice cooking quickly generates heat, and a temperature difference occurs between the portion where the magnetic members 40a, 40b, 40c are joined and the portion where the magnetic members 40a, 40b, 40c are joined. Bubbles are generated from the place where the bottom is heated quickly, and the bubbles rise and rupture, thereby generating convection in water and rice that are to-be-cooked rice.

Further, the location where the magnetic members 40a, 40b and 40c are joined is a thickness obtained by adding the thickness of the inner hook 6 and the thickness of the magnetic members 40a, 40b and 40c, and the volume of the metal is increased. The heat capacity is increased compared to the portion where 30b and 30c are not joined, and the difference in the bubble generation due to the temperature difference is maintained due to the temperature difference being maintained, thereby further promoting convection.

Furthermore, the magnetic members 40a, 40b, and 40c are arranged so that the size gradually decreases from the center of the inner hook 6 toward the outer side. Since the large magnetic member 40a is arranged near the center, the center is heated more, and the convection from the center to the outside is promoted. As a result, the whole is heated uniformly, and the rice is cooked with less uneven cooking. Can be done.

Then, as described above, the location where the magnetic body 15 is arranged has a strong force to heat the inner pot 6 by suppressing the leakage of the lines of magnetic force. And the magnetic members 40a, 40b, and 40c can be aligned to increase the heating power. In this case, it is desirable to provide alignment between the inner hook 6 and the inner hook housing portion so that the arrangement position of the magnetic body 15 and the arrangement positions of the magnetic members 40a, 40b, and 40c do not deviate.

Embodiment 4 FIG.
The induction heating rice cooker according to Embodiment 4 of the present invention is different in that an elastic member is attached to the magnetic member 20 joined to the inner pot of the induction heating rice cooker according to Embodiment 1 of the present invention. These are the same as that of the induction heating rice cooker which concerns on Embodiment 1 of this invention.

Therefore, FIG. 8 and FIG. 5 described above in the first embodiment of the present invention describe the inner pot of the induction heating rice cooker according to the fourth embodiment of the present invention, and the other description is omitted.
FIG. 8: is the elements on larger scale of the state which attached the elastic member to the magnetic member of the inner pot of the induction heating rice cooker which concerns on Embodiment 4 of this invention.

  As described in the first embodiment of the present invention, a plurality of magnetic members 20 of the same circumference having a cylindrical convex shape are joined to the bottom of the outer surface of the inner hook 6 at positions facing the induction heating coils 10a, 10b, 10c. Has been.

As shown in FIG. 8, the elastic member 60 is attached to the magnetic member 20 so that the outer periphery may be covered. The elastic member 60 is formed of a flexible and elastic material such as silicone rubber having high heat resistance, and is attached by press-fitting afterwards.

When spot welding is performed on the surface of the magnetic member 20, an indentation 21 (see FIG. 5C) due to a welding electrode is generated, and there is a possibility that the countertop or the tabletop of the kitchen may be damaged as it is.

However, by attaching the elastic member 60 that is flexible and elastic, the kitchen countertop and tabletop are not damaged. Further, by attaching an elastic member 60 made of a material such as silicone rubber, an anti-slip effect can be obtained so that the inner pot 6 does not slip on the countertop or tabletop of the kitchen.

In addition, although Embodiment 4 of this invention demonstrated by the example which attached the elastic member 60 to the magnetic member 20 joined to the inner pot 6 of the induction heating rice cooker which concerns on Embodiment 1 of this invention, this invention. Even if an elastic member is attached to the magnetic members 30a, 30b, 30c joined to the inner pot 6 of the induction heating rice cooker according to the second embodiment of the present invention, the inner pot of the induction heating rice cooker according to the third embodiment of the present invention An elastic member may be attached to the magnetic members 40a, 40b, and 40c joined to 6, and the same effect can be obtained in any case.

  As mentioned above, according to the induction heating rice cooker which concerns on embodiment of this invention, the magnetic member is joined as another member, and the location where the magnetic member was joined is the thickness of an inner pot and the thickness of a magnetic member. Therefore, the heat capacity is larger and the temperature difference is generated compared to the part where the magnetic member is not joined, and bubbles are generated from the part where the inner bottom of the inner pot heats up quickly. When the bubbles rise or rupture, the convection occurs in the water and rice, which is the rice to be cooked, and the whole is heated uniformly, and the temperature difference is maintained, so the difference in the generation of bubbles due to the temperature difference Is maintained and convection is further promoted, which makes it possible to cook rice with less uneven cooking.

In addition, since the magnetic member is joined as a separate member and the clad material, which is a bonding material of different metals, is not partially protruded by pressing or the like, the bonded portion of different metals is not damaged. Therefore, the inner pot will not be deformed when heating the cooked rice at a high temperature.

Furthermore, by attaching an elastic member to the magnetic member, the magnetic member does not damage the kitchen countertop or tabletop, and the inner pot 6 does not slide on the kitchen countertop or tabletop.

  DESCRIPTION OF SYMBOLS 1 Main body, 2 cover body, 2a cover upper surface cover, 2b exhaust port, 2c communication port, 3 operation part, 4 display window, 5 lock release button, 5a lock part, 6 inner hook, 6a flange, 7 inner cover, 7a Seal packing, 7b Cartridge, 8 Hinge part, 9 Control board, 10a Induction heating coil, 10b Induction heating coil, 10c Induction heating coil, 11 Temperature sensor, 12 Cooling fan, 13 Body heater, 14 Bottom plate, 15 Magnetic body, 20 Magnetic member, 21 Indentation, 22 Magnetic metal, 23 Non-magnetic metal, 24 Fluorine resin coat, 30a Magnetic member, 30b Magnetic member, 30c Magnetic member, 40a Magnetic member, 40b Magnetic member, 40c Magnetic member, 50 Induction heating coil, 60 Elastic member, 100 rice cooker.

Claims (9)

The body,
An inner pot that is detachably stored in an inner pot storage section provided in the main body,
An induction heating coil provided below the inner pot housing in the main body;
An inverter board for supplying electric power to the induction heating coil,
The inner hook is made of a dissimilar metal bonding material made of a non-magnetic metal and a magnetic metal, and the outer surface of the inner hook is made of the magnetic metal, and is formed into a bottomed cylindrical shape by press working. After that, an induction heating rice cooker characterized in that a magnetic member made of a separate magnetic metal projecting from the outer surface of the inner pot is joined to the bottom of the outer surface of the inner pot by welding .   The induction heating rice cooker according to claim 1, wherein a plurality of the magnetic members are joined to a bottom portion of the outer surface of the inner pot.   3. The induction heating rice cooker according to claim 1, wherein a plurality of the magnetic members are joined to the bottom portion of the outer surface of the inner pot so as to face the induction heating coil.   The induction heating coil has one or a plurality of annular coil shapes, and the magnetic member is joined to a position facing the annular coil shape. The induction heating rice cooker described in the item.   The induction heating rice cooker according to any one of claims 1 to 4, wherein the plurality of magnetic members are arranged radially from the inside to the outside of the bottom of the outer surface of the inner pot.   The induction heating rice cooker according to any one of claims 2 to 5, wherein the plurality of magnetic members have a protruding shape having the same area.   6. The induction according to claim 2, wherein the plurality of magnetic members are configured such that a projecting area decreases from an inner side to an outer side of the bottom portion of the outer surface of the inner hook. Heated rice cooker.   The induction heating rice cooker according to any one of claims 2 to 4, wherein the plurality of magnetic members have annular projection shapes having different diameters.   The induction heating rice cooker according to any one of claims 1 to 8, wherein an elastic member is attached so as to cover an outer surface of the magnetic member.

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