JP2885154B2 - Electric rice cooker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric rice cooker, and more particularly to an electric rice cooker in which the efficiency of heating an inner pot is improved.

[0002]

2. Description of the Related Art In a general electric rice cooker, rice cooking is performed by heating an inner pot containing rice and water by a heating means disposed below the inner pot.

In the case of using a work coil (in other words, an electromagnetic induction coil) as a heating means, an inner pot is heated by generating an eddy current at the bottom of the inner pot with a magnetic flux generated by the work coil. ing.

[0004]

However, in the electric rice cooker having the above-described structure, the temperature of the bottom of the inner pot, that is, the portion corresponding to the work coil during the rice cooking is necessarily higher than the temperature of the other portions. Therefore, there is a problem that it is difficult to uniformly heat the rice stored in the inner pot. In addition, since bubbles generated at the bottom of the inner pot at the time of boiling tend to grow while moving along the inner peripheral surface of the inner pot, only large bubbles are less likely to be generated, and strong convection hardly occurs. Then, there is also a problem that it is difficult to obtain a good cooked state because the rice is not sufficiently stirred during the cooked rice.

[0005] The present invention has been made in view of the above points, and an object of the present invention is to provide a good rice cooking state during rice cooking .

[0006]

According to the first aspect of the present invention, as a means for solving the above-mentioned problems, a container main body in which an inner pan can be set and an upper opening of the container main body are provided. With a lid that can be opened and closed freely and an electromagnetic induction coil
Heating means for heating the inner pot by generating an eddy current in the inner pot with the generated magnetic flux, and temperature detecting means for detecting the temperature of the inner pot by being brought into contact with the bottom center of the inner pot. a electric cooker equipped with the inner bottom of the inner pot, a portion excluding the portion where the temperature detecting means is contact, the
For the inner bottom of the inner pan and the curved part from the inner bottom to the side
Forms a number of small projections and the inner bottom of the inner pan and
Corresponding portions of the curved portion from the inner bottom portion to the side surface
The work coil is provided, and at the time of cooking rice, increasing the heat transfer area in the inner bowl to the magnetic field lines from the work coil
And a large number of small air bubbles to generate strong convection, and also to enable efficient rice washing, and without impairing the adhesion between the temperature detecting means and the bottom surface of the inner pot. , So that accurate temperature detection can be performed.

According to a second aspect of the present invention, as a means for solving the above-mentioned problems, a container main body in which an inner pot can be set, and a lid for opening and closing the upper opening of the container main body are provided. With the magnetic flux generated by the body and the electromagnetic induction coil
Electric rice cooker comprising: heating means for generating an eddy current in the inner pot to heat the inner pot; and temperature detecting means abutting on the bottom center of the inner pot to detect the temperature of the inner pot. In the vessel, the inner bottom portion of the inner pan is a portion excluding a portion where the temperature detecting means abuts, and the inner bottom portion of the inner pan and
In the curved portion extending from the inner bottom to the side surface, a large number of small recesses are formed, and the inner bottom of the inner pan and the inner bottom portion to the side surface are formed.
The work coil
The provided, at the time of cooking, increase the heat transfer area in the inner bowl
To absorb much of the magnetic force lines from the work coil
In addition to the fact that strong convection is obtained by the generation of a large number of small bubbles, rice washing can be performed efficiently, and accurate temperature detection is performed without impairing the adhesion between the temperature detecting means and the bottom surface of the inner pot. Can be done.

As in the third aspect of the present invention, in the first and second aspects of the present invention, the film thickness of the fluororesin coating layer in the region where the small projections, the small concave portions or the convex portions are formed is changed. When the size is larger than the portion, uniform heating during rice cooking is promoted, and the scorch of cooked rice during rice cooking can be prevented, which is preferable.

According to a fourth aspect of the present invention, in the first or second aspect of the present invention, the area where the small projections, the small concave parts or the convex parts are formed, and the other part are coated with a fluororesin. It is preferable that the color tone of the layer be different, since the rice cooked amount display becomes clear.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Some preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

First, two types of structures of the electric rice cooker according to the present invention will be described.

FIG. 1 shows an electric rice cooker using an electromagnetic induction coil (hereinafter referred to as a work coil) as a heating means.

This electric rice cooker is constructed so that the inner pot 3 can be set therein and has a double-structured container body 1 having a space portion 4, and covers the upper opening of the container body 1 so as to be openable and closable. And a lid 2.

The container body 1 has a body 5a serving as an outer wall.
An outer case 5 having a substantially inverted L-shaped cross section made of an integrally molded product of a synthetic resin (for example, polypropylene) having an upper wall and a shoulder 5b serving as an upper wall, and an upper end connected to an inner peripheral edge of the shoulder 5b. A cylindrical inner case 6 with a bottom made of a synthetic resin (for example, made of polypropylene), and a dish-like made of a synthetic resin (for example, made of polypropylene) whose upper end is joined to the lower end of the body 5a of the outer case 5 , And the space 4 is formed by being surrounded by the outer case 5, the inner case 6, and the bottom member 7. Note that the inner pan 3 is set in the inner case 6 so as to be removable.

In the center of the bottom surface of the inner case 6, there is formed a sensor hole 9 for facing a center sensor 8 acting as a temperature detecting means. The sensor hole 9 acts as a heating means so as to surround the sensor hole 9. An annular work coil 10 is disposed on the bottom surface of the inner case 6 and on a curved portion from the bottom surface to the side peripheral surface.

The inner pot 3 is of a round bottom type having a large radius of curvature of a curved portion 3b from the bottom 3a to the side peripheral portion 3c. It is arranged corresponding to.

The work coil 10 is mounted on the inner case 6.
The ferrite core 12 is sandwiched between the bottom surface of the inner case 6 and the ferrite core 12 fixed to the bottom surface of the inner case 6 by screws 11. It also acts as a shield so as not to affect the air. A center sensor 8 is provided in the sensor hole 9 to be in contact with the bottom of the inner pot 3. A heater 13 for keeping heat is attached to a side peripheral surface of the inner case 6. Further, a cylindrical partition wall 14 is suspended from the lower surface of the outer case shoulder 5b, and a heat insulating material 15 is disposed between the partition wall 14 and the inner case 6.

A heat shield plate 16 is supported below the ferrite core 12, and a cooling fan 17 is disposed on the heat shield plate 16. The cooling fan 17 sends cooling air to a power transistor and a rectifying diode bridge (not shown) for controlling the energization of the work coil 10. The cooling fan 17 is rotated by the fan motor 18. Axial impeller 19 is provided. The bottom wall of the container body 1 (specifically,
On the bottom surface of the bottom member 7), a cooling air inlet 20 is formed to face the cooling fan 17.

On the other hand, the lid 2 has an upper plate 21 made of synthetic resin (for example, made of polypropylene) constituting the outer surface and a donut-shaped lower plate made of synthetic resin (made of, for example, polypropylene) constituting the inner peripheral surface. A plate 22 and a metal radiator plate 23 attached to the lower plate 22;
A hollow part 25 for accommodating the heat insulating material 24 is formed between the upper and lower plates 21 and 22.

The lid 2 is provided with a shoulder 5b of the outer case 5.
Is rotatably and detachably attached to one side via a hinge pin 26.

At the center of the lid 2, there is formed a tubular portion 27 which is suspended from the upper plate 21, and the inside of the tubular portion 27 discharges steam generated during rice cooking to the outside. And a steam discharge passage 28. A pressure adjusting cylinder 30 is attached to a lower end of the cylindrical portion 27 via a seal packing 29.

The radiator plate 23 is provided with the steam discharge passage 2.
8, a hole 31 corresponding to the lower end is formed.
Is connected to and supported by the seal packing 29. The outer peripheral edge of the heat radiating plate 23 is connected to the inner peripheral edge of the lower plate 22 via a seal packing 32. When the lid 2 is closed, the seal packing 32 is pressed against the upper rim of the inner pot 3 to maintain airtightness.

On the upper surface of the heat sink 23, the heat sink 23
A lid heater 33 for preventing dew formation and growth of oneva by heating the fin is provided.

In the space 4 on the front side of the container body 1 (ie, on the side where the lock mechanism 34 for locking the lid 2 is provided), the work coil 10, the heater 13 and the lid heater 33 are provided. A control board 35 in which a control unit for controlling the energization is incorporated, various switches (for example,
A switch board 36 having a rice cooker switch, a reservation switch, a warming switch, and the like) and a liquid crystal display device 37 are provided.

FIG. 2 shows an electric rice cooker using a hot plate type electric heater as a heating means.

The electric rice cooker includes a main body container 1 configured to accommodate the inner pot 3, and a lid 2 that covers an upper opening of the main body container 1.

The main body container 1 includes a sheet metal inner case 42 forming an inner peripheral surface, a sheet metal outer case 43 forming an outer peripheral surface, and an upper end edge of the inner case 42 and the outer case 43. Synthetic resin shoulder member 44 for joining to the upper edge
And a bottom member 45 made of synthetic resin for covering the lower end opening of the outer case 43. On the bottom surface of the inner case 42, a hot plate 46 made of a good heat conductor (for example, aluminum alloy) is provided. A hot plate type electric heater 10 in which a sheath heater 47 is embedded is fixed by screws 48. The inner pan 3 is to be accommodated in the main body container 1 while being placed on the hot platen 46.

The inner pot 3 is of a round bottom type having a large radius of curvature of a curved portion 3b from the bottom 3a to the side peripheral portion 3c. 3b. This greatly contributes to the improvement of the heating efficiency.

A hole 49 is formed in the center of the hot platen 46 so as to penetrate vertically, and a temperature sensor 8a (for example, a thermistor) faces the hole 49 so that the center sensor 8 functions as temperature detecting means. Are provided so as to penetrate the bottom surface of the inner case 42. A heat retaining heater 6 is disposed at an upper and lower middle portion of the outer peripheral surface of the inner case 42.

On the other hand, the lid 2 has an upper plate 21 made of synthetic resin (for example, made of polypropylene) constituting the outer surface and a donut-shaped lower plate made of synthetic resin (made of, for example, polypropylene) constituting the inner peripheral surface. A plate 22 and a metal radiator plate 23 attached to the lower plate 22;
A hollow part 25 for accommodating the heat insulating material 24 is formed between the upper and lower plates 21 and 22.

The lid 2 is rotatably and detachably attached to one side of the shoulder member 44 via the hinge pin 26.

At the center of the lid 2, there is formed a tubular portion 27 which is suspended from the upper plate 21, and the inside of the tubular portion 27 discharges steam generated during rice cooking to the outside. And a steam discharge passage 28. A pressure adjusting cylinder 30 is attached to a lower end of the cylindrical portion 27 via a seal packing 29.

The radiator plate 23 is provided with the steam discharge passage 2.
8, a hole 31 corresponding to the lower end is formed.
Is connected to and supported by the seal packing 29. The outer peripheral edge of the heat radiating plate 23 is connected to the inner peripheral edge of the lower plate 22 via a seal packing 32. When the lid 2 is closed, the seal packing 32 is pressed against the upper rim of the inner pot 3 to maintain airtightness.

On the upper surface of the heat sink 23, the heat sink 23
A lid heater 33 for preventing dew formation and growth of oneva by heating the fin is provided.

On the front side of the container body 1 (that is, on the side provided with a lock mechanism 34 for locking the lid 2), control of energization to the electric heater 10, the heater 13 and the lid heater 33 and the like is performed. A control board 35 incorporating a control unit and various switches (for example, a rice cooker switch,
A switch board 36 having a reservation switch, a heat insulation switch, and the like) is provided.

First Embodiment FIGS. 3 to 5 show an inner pot in an electric rice cooker according to a first embodiment of the present invention.

The inner pot 3 is used in any of the above-mentioned two types of electric rice cookers, and has a portion corresponding to the heating means 10 (for example, an electric heater or a work coil) at the inner bottom (that is, a portion corresponding to the electric cooker). , A plurality of small projections 50 are integrally formed on the bottom 3a and the curved portion 3b).

Each of the small projections 50 is formed by punching the cast inner pot 3 from the outside. Therefore, a recess 51 formed by stamping is formed outside each small projection 50 (see FIG. 4). Since such a forming method is employed, the center sensor 8
The small protrusion 50 is not formed in the center portion of the inner pot bottom 3a (that is, the portion where the center sensor 8 contacts) in consideration of the close contact with the inner pot. That is, the small protrusions 50, 50,.
Are formed on the inner pot bottom 3a except for the central portion and on the curved portion 3b. However, the inner pot bottom 3a is formed so as to have a predetermined interval on the concentric circle from the center and in a staggered arrangement. The inner pot curved portion 3b is formed concentrically at predetermined intervals (see FIG. 5).
The small projection 50 may be formed at the time of casting the inner pot 3, and in that case, it may be formed also at the center sensor contact portion.

The interval between the small projections 50, 50...
In order to efficiently obtain the contact state between the rice grains and the small projections 50, 50,.

In the case where the inner pot 3 is an electric rice cooker using a hot plate type electric heater as a heating means, as shown in FIG. In the case of an electric rice cooker which is constituted by a fluororesin coating layer 55 coated on the inner surface side of the aluminum alloy layer 54 and uses an electromagnetic induction coil as a heating means,
As shown in FIG. 4B, the aluminum alloy layer 54 as the base material
A fluorine resin coating layer 55 coated on the inner surface side of the aluminum alloy layer 54;
4 and a stainless steel layer 56 formed on the outer surface side. In the stainless steel layer 56, an eddy current is generated by electromagnetic induction by the work coil 10.

With the above-described structure, the bottom 3a and the curved portion 3b of the inner pot 3 become higher in temperature than the other portions due to the heating action of the heating means 10 during rice cooking. The surface area increases due to the formation of the heat transfer layer, and the heat transfer area in the portion increases. Accordingly, uniform heating during rice cooking can be obtained, and a good rice cooking state can be obtained.

Further, due to the formation of the small protrusions 50, 50,..., Bubbles generated during rice cooking and moving along the inner peripheral surface of the inner pot 3 collide with the small protrusions 50, 50,. Therefore, the air bubbles are separated from the inner peripheral surface before the operation, and a large number of small air bubbles are generated. Therefore, strong convection occurs in the inner pot 3 during rice cooking, and a good rice cooking state is obtained.

Further, by the formation of the small projections 50, 50,..., Rice can be washed efficiently by contact between rice grains and the small projections 50, 50,.

Second Embodiment FIG. 6 shows an inner pot in an electric rice cooker according to a second embodiment of the present invention.

In this case, the film thickness of the fluororesin coating layer in the region F (ie, the bottom 3a and the curved portion 3b) where the small protrusions 50 are formed is made larger than the other portions. That is, the number of times of coating of the fluororesin coating layer in the hatched portion F in FIG. 6 is larger than in other portions. By doing so, the heat conduction in the hatched area F, which is at a high temperature during rice cooking, and the heat conduction in other parts (ie, the side peripheral portion 3c) are substantially the same, and uniform heating during rice cooking is further promoted. ,
It will also contribute to the prevention of scorching of cooked rice.

The other configuration, operation, and effect are the same as those in the first embodiment, and thus the description is omitted.

Third Embodiment FIG. 7 shows an inner pot in an electric rice cooker according to a third embodiment of the present invention.

In this case, the region F in which the small protrusions 50 are formed (that is, the bottom portion 3a serving as the minimum rice cooking amount region).
And the curved portion 3b), the upper region F 'of the side peripheral portion 3c (that is, the region exceeding the maximum amount of cooked rice), and the intermediate region F ″ between the two.
The color tone of the fluororesin coating layer is different between and. In this way, there is an advantage that the display of the minimum cooked rice amount and the maximum cooked rice amount can be easily confirmed due to the difference in color tone. In order to make the color tone of the fluororesin coating layer in the region F different from that of the intermediate region F ″, a coating layer having the same color as that of the intermediate region F ″ is formed, and a fluororesin having a color tone different from that of the intermediate region F ′ is further coated. In such a case, the heat conduction in the region F where the temperature is high during rice cooking is substantially the same as the heat conduction in the other portion (that is, the side peripheral portion 3c), and the uniform heating during rice cooking is further promoted. It also contributes to the prevention of scorched rice.

The other configuration, operation, and effect are the same as those in the first embodiment, and the description is omitted.

Fourth Embodiment FIGS. 8 to 10 show an inner pot in an electric rice cooker according to a fourth embodiment of the present invention.

In this case, a large number of small recesses 52 are formed in the inner bottom of the inner pot 3 at the portion (that is, the bottom 3a and the curved portion 3b) corresponding to the heating means 10 (for example, the work coil).
52 are integrally formed.

Each of the small recesses 52 is formed by stamping from the inside of the cast inner pot 3. Therefore, the protruding portions 53 formed by stamping are respectively formed outside the small concave portions 52 (see FIG. 9). Since such a forming method is employed, the center sensor 8
In consideration of the adhesion to the inner pot, the small concave portion 52 is not formed at the center of the inner pot bottom 3a (that is, the portion where the center sensor 8 contacts). That is, the small recesses 52, 52,.
Are formed on the inner pot bottom 3a except for the central portion and on the curved portion 3b. However, the inner pot bottom 3a is formed so as to have a predetermined interval on the concentric circle from the center and in a staggered arrangement. The inner pot curved portion 3b is formed concentrically at predetermined intervals (see FIG. 10). The small concave portion 52 may be formed at the time of casting the inner pot 3, and in that case, the small concave portion 52 may be formed also at the center sensor contact portion.

The interval between the small recesses 52, 52...
It is desirable that the interval is at least larger than the rice grain so that the contact state between the rice grain and the small concave portions 52, 52,.

In this case, it is desirable to use the work coil 10 as a heating means, since the raised portion 53 is formed on the lower surface of the bottom 3a of the inner pot 3. Therefore, inner pot 3
Is an aluminum alloy layer 54 as a base material, as shown in FIG.
A fluorine resin coating layer 55 coated on the inner surface side of the aluminum alloy layer 54;
4 and a stainless steel layer 56 formed on the outer surface side. In the stainless steel layer 56, an eddy current is generated by electromagnetic induction by the work coil 10.

With the above-described configuration, the bottom portion 3a and the bent portion 3b of the inner pot 3 become higher in temperature than other portions due to the resistance heat of the eddy current generated by the work coil 10 during cooking rice. The surface area is increased by the formation of the concave portions 52, 52,..., And the heat transfer area in the portion is increased. Accordingly, uniform heating during rice cooking can be obtained, and a good rice cooking state can be obtained.

Also, due to the formation of the small recesses 52, 52,..., Bubbles generated during rice cooking and moving along the inner peripheral surface of the inner pot 3 come into contact with the small recesses 52, 52,. Therefore, the air bubbles are separated from the inner peripheral surface before the operation, and a large number of small air bubbles are generated. Therefore, strong convection occurs in the inner pot 3 during rice cooking, and a good rice cooking state is obtained.

Further, by the formation of the small recesses 52, 52,..., Rice can be washed efficiently by contact between rice grains and the small recesses 52, 52,.

Fifth Embodiment FIG. 11 shows an inner pot in an electric rice cooker according to a fifth embodiment of the present invention.

In this case, the second embodiment differs from the above-described second embodiment only in that a number of small recesses 52 are formed in the inner bottom portion 3a and the curved portion 3b of the inner pot 3. Since the other configuration and operation and effect are the same as those of the second embodiment, the description is omitted.

Sixth Embodiment FIG. 12 shows an inner pot in an electric rice cooker according to a sixth embodiment of the present invention.

In this case, the third embodiment differs from the third embodiment only in that a number of small recesses 52 are formed in the inner bottom portion 3a and the curved portion 3b of the inner pot 3. Since the other configuration and operation and effect are the same as those of the third embodiment, the description is omitted.

Seventh Embodiment FIGS. 13 and 14 show an inner pot in an electric rice cooker according to a seventh embodiment of the present invention.

In this case, in the inner bottom portion of the inner pot 3, a large number of continuous convex portions 57 are integrally formed at a portion (that is, the bottom portion 3a and the curved portion 3b) corresponding to the heating means 10 (for example, a work coil). Is formed.

Each of the projections 57 has a predetermined size (ie,
It is considerably larger than the small protrusion 50 in the first embodiment), and is formed by punching the cast inner pot 3 from the outside. Therefore, a recess 58 formed by stamping is formed outside each of the protrusions 57 (see FIG. 14). Since such a forming method is employed, the convex portion 57 is formed at the center of the inner pot bottom 3a (that is, the portion where the center sensor 8 is in contact) in consideration of the adhesion to the center sensor 8. Not done.
That is, the convex portions 57, 57,... Are formed in a portion of the inner pot bottom 3a except for the central portion and in the curved portion 3b. In addition, the convex part 57 may be formed at the time of casting the inner pot 3, and in that case, it may be formed at the center sensor contact part.

As shown in FIG. 14, the inner pot 3 includes an aluminum alloy layer 54 as a base material and an aluminum alloy layer 5
4 is composed of a fluororesin coating layer 55 coated on the inner surface side and a stainless steel layer 56 formed on the outer surface side of the aluminum alloy layer 54. In the stainless steel layer 56, an eddy current is generated by electromagnetic induction by the work coil 10.

With the above structure, the bottom 3a and the curved portion 3b of the inner pot 3 become higher in temperature than other portions due to the resistance heat of the eddy current generated by the work coil 10 during cooking. The formation of the portions 57, 57,... Increases the surface area, and increases the heat transfer area in that portion. Accordingly, uniform heating during rice cooking can be obtained, and a good rice cooking state can be obtained.

Also, by forming the convex portions 57, 57,.
Bubbles generated at the time of cooking and moving along the inner peripheral surface of the inner pot 3 are separated from the inner peripheral surface before growing large in the valleys of the convex portions 57, 57,. Will occur. Therefore, at the time of cooking rice, each protrusion 57
Small convection W is generated in a portion corresponding to the above, strong convection occurs in the inner pot 3, and a good rice cooking state is obtained. In addition, due to the generation of the small convection W, ideal heating can be obtained even when cooking a small amount of rice, and delicious rice can be cooked even in a small amount.

The projections 57, 57,.
The surface area of the stainless steel layer 56 in each convex portion 57 is increased by the formation of the protrusions 57, and the magnetic lines of force from the work coil 10 which cannot be utilized for heat generation in the past are absorbed much. Therefore, more efficient heating can be obtained during rice cooking.

The other configuration and operation and effect are the same as those of the first embodiment, and the description is omitted.

Eighth Embodiment FIG. 15 shows an inner pot in an electric rice cooker according to an eighth embodiment of the present invention.

In this case, the region F in which the convex portions 57 are formed (that is, the bottom portion 3a and the curved portion 3b serving as the minimum rice cooking amount region) and the upper region F 'of the side peripheral portion 3c (that is, The area exceeding the maximum amount of cooked rice) and an intermediate area F ″ between the two.
The color tone of the fluororesin coating layer is different between and. In this way, there is an advantage that the display of the minimum cooked rice amount and the maximum cooked rice amount can be easily confirmed due to the difference in color tone. In order to make the color tone of the fluororesin coating layer in the region F different from that of the intermediate region F ″, a coating layer having the same color as that of the intermediate region F ″ is formed, and a fluororesin having a color tone different from that of the intermediate region F ′ is further coated. In such a case, the heat conduction in the region F where the temperature is high during rice cooking is substantially the same as the heat conduction in the other portion (that is, the side peripheral portion 3c), and the uniform heating during rice cooking is further promoted. It also contributes to the prevention of scorched rice.

The other configuration, operation, and effect are the same as those in the first and seventh embodiments, and thus the description is omitted.

[0073]

According to the first or second aspect of the present invention, the portion of the inner bottom of the inner pan except for the portion where the temperature detecting means is in contact with the inner pan, and the inner bottom of the inner pan and the inner bottom
In the curved part from the part to the side surface, a number of small projections or small recesses are formed, and the inner bottom of the inner pot and the inner bottom are
The work is placed on the corresponding part of the curved part reaching the side.
By providing the coil, the inner bottom portion of the inner pan and the
Increased heat transfer surface area at the curved section from the inner bottom to the side
It is possible to obtain a good rice cooking state.

Also, with the magnetic flux generated by the electromagnetic induction coil,
The inner pot itself is heated to generate eddy currents in the inner pot
That is, due to the formation of the small projections or small recesses, the bubbles generated during rice cooking and moving along the inner peripheral surface of the inner pot come into contact with the small projections or small recesses and grow large before the inner peripheral surface grows. And a large number of small air bubbles are generated, and during cooking , heating the inner pot itself
In combination therewith , strong convection is generated in the inner pot, and there is also an effect that a good rice cooking state can be obtained.

Further, the formation of the small projections or small recesses makes it possible to obtain the contact between the rice grains and the small projections or small recesses during rice washing, and has the effect that the rice can be washed efficiently.

Further, since the adhesion between the temperature detecting means and the inner pot is not impaired, there is an effect that accurate temperature detection can be performed.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the film thickness of the fluororesin coating layer in the region where the small projections, the small recesses or the projections are formed is set to another value. Since it is larger than the portion, uniform heating during cooking is promoted and scorching of cooked rice during cooking can be prevented.

According to a fourth aspect of the present invention, in the first or second aspect of the present invention, the area where the small projections, small recesses or projections are formed, and the other portion are made of the fluororesin coating layer. Since the color tone is different, it is easy to confirm the rice cooked amount display.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an example of an electric rice cooker according to the present invention.

FIG. 2 is a longitudinal sectional view showing another example of the electric rice cooker of the present invention.

FIG. 3 is a longitudinal sectional view of an inner pot in the electric rice cooker according to the first embodiment of the present invention.

FIG. 4 is an enlarged sectional view of a main part of the inner pot in the electric rice cooker according to the first embodiment of the present invention.

FIG. 5 is a half plan view of an inner pot in the electric rice cooker according to the first embodiment of the present invention.

FIG. 6 is a longitudinal sectional view of an inner pot in an electric rice cooker according to a second embodiment of the present invention.

FIG. 7 is a longitudinal sectional view of an inner pot in an electric rice cooker according to a third embodiment of the present invention.

FIG. 8 is a longitudinal sectional view of an inner pot in an electric rice cooker according to a fourth embodiment of the present invention.

FIG. 9 is an enlarged sectional view of a main part of an inner pot in an electric rice cooker according to a fourth embodiment of the present invention.

FIG. 10 is a partially cutaway plan view of an inner pot in an electric rice cooker according to a fourth embodiment of the present invention.

FIG. 11 is a longitudinal sectional view of an inner pot in an electric rice cooker according to a fifth embodiment of the present invention.

FIG. 12 is a longitudinal sectional view of an inner pot in an electric rice cooker according to a sixth embodiment of the present invention.

FIG. 13 is a longitudinal sectional view of an inner pot in an electric rice cooker according to a seventh embodiment of the present invention.

FIG. 14 is an enlarged sectional view of a main part of an inner pot in an electric rice cooker according to a seventh embodiment of the present invention.

FIG. 15 is a longitudinal sectional view of an inner pot in an electric rice cooker according to an eighth embodiment of the present invention.

[Explanation of symbols]

1 is a container body, 2 is a lid, 3 is an inner pot, 3a is a bottom, 3b
Is a curved portion, 3c is a side peripheral portion, 8 is a temperature detecting means (center sensor), 10 is a heating means (electric heater or work coil), 50 is a small protrusion, 52 is a small concave portion, 57 is a convex portion,
F is a region where small projections or small recesses are formed, and F 'is a region where the maximum amount of cooked rice is exceeded.

Claims (4)

(57) [Claims] 1. A container body configured such that an inner pot can be set therein, a lid body for opening and closing an upper opening of the container body, and an inner pot with magnetic flux generated by an electromagnetic induction coil.
An electric rice cooker comprising heating means for generating an eddy current to heat the inner pan, and temperature detecting means abutting on the bottom center of the inner pan to detect the temperature of the inner pan. The inner bottom portion of the inner pot is a portion excluding a portion where the temperature detecting means is in contact with the inner bottom portion of the inner pot and
A number of small projections are formed on the curved portion extending from the inner bottom to the side, and the inner bottom of the inner pan and the inner bottom to the side are formed.
The work coil is attached to each corresponding part of the curved part
An electric rice cooker characterized by being provided . 2. A container body configured to be able to set an inner pot therein, a lid body for opening and closing an upper opening of the container body, and an inner pot with a magnetic flux generated by an electromagnetic induction coil.
An electric rice cooker comprising heating means for generating an eddy current to heat the inner pot, and temperature detecting means for detecting the temperature of the inner pot which is in contact with the bottom center of the inner pot. The inner bottom portion of the inner pot is a portion excluding a portion where the temperature detecting means is in contact with the inner bottom portion of the inner pot and
A number of small recesses are formed in the curved portion extending from the inner bottom to the side, and the inner bottom of the inner pan and the inner bottom to the side are formed.
The work coil is attached to each corresponding part of the curved part
An electric rice cooker characterized by being provided . 3. The film according to claim 1, wherein the thickness of the fluororesin coating layer in a region where the small projections, small recesses or protrusions are formed is made larger than other portions. An electric rice cooker according to any one of the preceding claims. 4. The fluororesin coating layer according to claim 1, wherein the color tone of the fluororesin coating layer is different between a region where the small projections, small recesses or projections are formed, and another portion. An electric rice cooker according to any one of the preceding claims.