JPH0810140A - Electric rice-cooker - Google Patents

Abstract

PURPOSE:To elevate rapidly a heating body to the highest temp. and to cook tasty rice by applying a black-colored treating film for improving the heat absorption rate on the outer faces of an inner pot and the heating body for heating this. CONSTITUTION:An electric rice-cooker is provided with an outer pot 2 in a bottomed cylindrical rice-cooker main body 1 and a disc-like hot plate 5 with good thermal conductivity is arranged in a space part 4 dividedly formed between the outer pot 2 and an inner pot 3 so as to be brought into contact with the bottom part 6a of the outer face 6 of the inner pot 3 and a ring-like sheathed heater 7 in the hot plate 5. In this case, a black-colored treating film 11 is applied on the outer face 6 of the inner pot 3 and the outer face of the hot plate 5. This treating film 11 is formed by a means such as a heat-resistant thermal spraying, a black coating, an alumanite coloring and a black plating. The inner pot 3 is heated by making heat of radiation from the heaters 5 and 7 absorb by the side part 6b of the outer face 6 of the inner pot 3 and the heat of radiation being not thermally absorbed to the side part 6b of the inner pot is thermally absorbed on the outer face of the heating body to improve heat efficiency.

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 in which a rice cooker is detachably mounted in a rice cooker main body, and a heating body for heating the rice cooker is provided at a lower portion of the rice cooker.

[0002]

2. Description of the Related Art In a conventional electric rice cooker of this type,
For example, the one disclosed in Japanese Utility Model Laid-Open No. 55-107817 is known, and this conventional electric rice cooker is configured as shown in FIG. 4, and in FIG. The heater 22 is installed on the bottom surface while being supported and fixed to the heat resistant support 23. The inner pot 24 is inserted from the upper end opening of the main body 21, and a flange 25 is formed on the upper edge of the inner pot 24. By placing the flange 25 on the upper end of the main body 21, The inner pot 24 is supported at a position apart from the heater 22.

The inner pot 24 supported by the main body 21 in this way
Black paint 26 on the side facing the heater 22
Is given. Incidentally, 27 is a lid that covers the upper end opening of the inner pot 24, and 28 is a foot that is provided on the bottom surface of the body 21 and supports the body 21.

The electric rice cooker configured as described above is
The heater 22 is energized to be in a heating state, and the heater 22
The air in the space surrounded by the main body 21 and the inner pot 24 is heated by the heating of the inner pot 24.
Is heated. At the same time, the radiant heat from the heater 22 reaches the space surrounded by the main body 21 and the inner pot 24, but since the surface of the inner pot 24 facing the heater 22 is coated with black paint 26, The black surface is directly absorbed and the inner pot 24 is heated by radiant heat.

[0005]

However, in the case of the electric rice cooker configured as described above, since the heater 22 is arranged at a predetermined distance from the bottom of the outer surface of the inner pot 24, The radiant heat of the heater 22 is transmitted through the space to the inner pot 2
The black surface of No. 4 heats the inner pot 24, but the radiant heat is not efficiently absorbed by the black surface of the inner pot 24. Therefore, the cooking time is prolonged and the rice cannot be cooked deliciously. was there.

The bottom of the outer surface of the inner pot 24 is the heater 2
2 is located in the vicinity of the inner hook 24, and the outer side surface of the inner hook 24 is the inner hook 24.
Since it is located away from the bottom of the outer surface of the heater 22 from the heater 22, there is a difference in the heat absorption rate of the radiant heat from the heater 22 between the bottom and the side of the outer surface of the inner pot 24, which causes uneven cooking of rice. There was a problem that was generated.

The electric rice cooker of the present invention solves the above problems, and an object thereof is to provide an electric rice cooker which can cook rice deliciously without prolonging the rice cooking time. is there.

[0008]

In order to achieve the above object, the electric rice cooker of the present invention is characterized in that the invention according to claim 1 is such that an inner pot is detachably mounted in the main body of the rice cooker, and the inner pot is attached. In an electric rice cooker equipped with a heating element to heat at the bottom of the inner pot,
The inner surface of the inner pot and the heating element are coated with a black-colored treatment film for improving the heat absorption rate. The invention according to claim 2 is the same as the invention according to claim 1, A treatment film having a high heat absorption rate is provided on a side portion of the outer surface of the kettle, and a treatment film having a heat absorption rate lower than that of the treatment film is provided on a bottom portion of the outer surface of the inner kettle. In addition to the invention according to claim 1 or claim 2, the described invention is such that the treatment film of the heating body is composed of a radiant substance that emits far infrared rays, and the treatment film of the inner pot absorbs far infrared rays. In addition to the invention according to claim 1 or claim 2 or claim 3, the treatment film has water repellency and lubricity. It is composed of the heat-resistant ceramic material.

[0009]

The present invention is configured as described above, and the invention according to claim 1 is such that the inner surface of the inner pot is heated by heating the outer surface of the inner pot and the heating body by applying a black treatment film for improving the heat absorption rate. The bottom of the outer surface of the inner part is heated by heat conduction, and the radiant heat from the heating element is absorbed by the side part of the outer surface of the inner pot to heat the inner part, and the radiant heat not absorbed by the side part of the inner part is The heat is absorbed by the outer surface of the heating element to heat the heating element, and the heating element can be quickly raised to the maximum temperature, so that the cooking time does not extend,
You can cook rice deliciously.

Further, in addition to the invention described in claim 1, the invention described in claim 2 is such that a treatment film having a high heat absorption rate is applied to a side portion of the outer surface of the inner pot, and a bottom portion of the outer surface of the inner pot is provided. By applying a treatment film having a lower heat absorption rate than the treatment film, the heat absorption rate at the outer side of the inner pot having a lower heat absorption rate is increased, and the heat absorption rate at the bottom of the outer surface having a higher heat absorption rate is decreased. By doing so, the heat absorption rate of the outer surface of the inner pot is made uniform, so that the rice can be cooked evenly.

Furthermore, the invention according to claim 3 is the same as claim 1.
Alternatively, in addition to the invention described in claim 2, the treatment film of the heating element is made of a radiant substance that emits far infrared rays, and the treatment film of the inner pot is made of an absorbing substance that absorbs far infrared rays. Radiant heat including far infrared rays is absorbed by the outer surface of the inner pot and heats the inner pot, so that the rice can be cooked deliciously without further prolonging the cooking time.

Furthermore, the invention according to claim 4 is the same as claim 1.
Alternatively, in addition to the invention of claim 2 or claim 3, the treated film is made of a heat-resistant ceramic material having water repellency and lubricity, so that the outer surface of the inner pot and the heating body can be easily repelled by water. As a result, the inner pot and the heating element are prevented from corroding due to water adhering to them. Moreover, dirt does not stick to the inner pot and even if the outer surface of the heating element is dirty Since it can be dropped, cleaning performance can be improved.

[0013]

Embodiments of the electric rice cooker of the present invention will be described in detail below with reference to FIGS. 1 and 3. One embodiment of the electric rice cooker of the present invention is configured as shown in FIG. 1, and in FIG. 1, an outer pot 2 is arranged in a bottomed cylindrical rice cooker body 1.
A heat insulating material (not shown) is interposed between the rice cooker body 1 and the outer pot 2, and the inner pot 3 is detachably mounted in the outer pot 2 so that the outer pot 2 and the inner pot 3 are connected to each other. A space portion 4 is provided between them, and a circular heat plate 5 having good heat conductivity is arranged in the space portion 4 so as to come into contact with the bottom portion 6a of the outer surface 6 of the inner pot 3. An annular sheathed heater 7 is provided, a lid 8 is attached to the opening edge of the rice cooker body 1 by means of a hinge or the like so as to be openable and closable, and an inner lid 9 is provided on the inner surface of the lid 8.

The outer surface 6 of the inner pot 3 and the hot plate 5 are
The outer surface 10 and the black treated film 11 are applied. The treatment film 11 is formed by means of heat-resistant thermal spraying, black coating, almanite coloring, black plating, or the like.

Next, the rice cooking operation of one embodiment of the electric rice cooker of the present invention will be described in detail. First, a predetermined amount of rice and water are put in the inner pot 3, the inner pot 3 is attached to the outer pot 2 of the rice cooker main body 1, and then the lid 8 is closed, and a rice cook switch (not shown). Press. When the rice cooking switch is pressed, the sheath heater 7 is energized to heat the hot plate 5, and the heated heat heats the bottom portion 6a of the outer surface 6 of the inner pot 3 through the heat plate 5 by direct heat conduction. Radiant heat from the heating plate 5 heats the air in the space 4, and the heat of the heated air is applied to the outer surface 6 of the inner pot 3.
The side portion 6b of the inner pot 3 heats the side portion 6b of the outer surface 6 of the inner pot 3 to heat the water in the inner pot 3 to cook rice.

The heat of the air in the space 4 which has not been absorbed by the side portion 6b of the outer surface 6 of the inner pot 3 is applied to the outer surface 1 of the heating plate 5.
Since the heat is absorbed by 0 to heat the hot plate 5 and the hot plate 5 can be quickly raised to the maximum temperature, rice can be cooked deliciously without prolonging the cooking time.

Another embodiment of the electric rice cooker of the present invention is constructed as shown in FIGS. 2 and 3. The same parts as those in the above-described embodiment are designated by the same reference numerals, and the description thereof will be omitted.

2 and 3, another embodiment of the electric rice cooker of the present invention is the treatment film 11 of the inner pot 3 of the above embodiment.
The treatment film 11 is applied to the outer surface 6 of the inner pot 3 excluding the bottom portion 12 of the outer face 6 of the inner pot 3 facing the position where the sheath heater 7 is disposed.

By configuring as in the other embodiment described above, the bottom portion 12 of the outer surface 6 of the inner pot 3 facing the arrangement position of the sheath heater 7 heats the hot plate 5 by the sheath heater 7. The heated heat heats the bottom portion 6a of the outer surface 6 of the inner pot 3 through the heat plate 5 by heat conduction, but since the amount of heat absorbed by the bottom portion 12 of the outer surface 6 of the inner pot 3 is high, Since the heat absorption rate of the bottom portion 12 of the outer surface 6 of the inner pot 3 is reduced to make the heat absorption rate of the bottom portion 6a of the outer surface 6 of the inner pot 3 and the bottom portion 12 uniform, the uneven cooking Can cook rice not.

Further, in the construction of the electric rice cooker of the above-mentioned embodiment, the sheathed heater 7 heats the heating plate 5 through the heating plate 5, and the heated heat causes the bottom portion 6a of the outer surface 6 of the inner pot 3 to pass through the heating plate 5. The space portion 4 is heated by heat conduction and is radiated from the heating plate 5.
The air of the inner pot 3 is heated, and the heat of the heated air is absorbed by the side portion 6b of the outer surface 6 of the inner pot 3 and the side portion 6b of the outer face 6 of the inner pot 3
Since the inner pot 3 is heated, a difference in heat absorption rate occurs between the bottom portion 6a and the side face 6b of the outer surface 6 of the inner pot 3, and therefore, the side portion 6b of the outer face 6 of the inner pot 3 absorbs heat. By providing the treatment film 11 having a high heat absorption rate and the bottom portion 6a of the outer surface 6 of the inner pot 3 having the heat absorption rate lower than that of the treatment film 11, the outer surface 6 of the inner pot 3 having a low heat absorption rate is provided. Of the outer surface 6 of the inner pot 3 by increasing the heat absorption rate of the side portion 6b of the inner pot 3 and decreasing the heat absorption rate of the bottom portion 6a of the outer surface 6 of the inner pot 3 having a high heat absorption rate.
Since the heat absorption rate between the side portion 6b and the side portion 6b is made uniform,
You can cook rice evenly.

Further, the treatment film 11 of the hot plate 5 is made of a ceramic material such as zirconia (ZrO ₂ ) which emits far infrared rays, and the treatment film 11 of the inner pot 3 is a metal oxide which absorbs far infrared rays. Since the radiant heat including far-infrared rays from the heating plate 5 is absorbed by the outer surface 6 of the inner pot 3 to heat the inner pot 3 by including the absorbing substance such as, the rice cooking time is not further prolonged, You can cook rice deliciously.

In addition, the treated film 11 is made of a heat-resistant ceramic material having water repellency and lubricity, so that the outer surface 6 of the inner pot 3 and the outer surface 10 of the heating plate 5 are well repelled by water. Therefore, the inner pot 3 and the hot plate 5 can be prevented from being corroded due to the adherence of water, and the dirt and the like can be prevented from sticking to the outer face 6 of the inner pot 3 and the outer face 10 of the hot plate 5.
Even if dirt gets on it, it can be easily removed,
Cleanability can be improved.

As the treated film 11, as shown in Table 1, the composition ratio of the binder of polytitanocarbosilane is 20 to 35%, manganese (Mn), iron (Fe), cobalt (Co), A composition ratio of a composite metal oxide black powder such as copper (Cu) and chromium (Cr) to a pigment containing a ceramic material such as potassium titanate short fibers 25 to 30 [%], and a silicone oil (200 cst) dispersant 1 to 8 [%], Xylene, n-butanol, butyl cellosolove composition ratio 3
By using 0-40 [%] Tyranno coat (trademark of Ube Industries, Ltd.), the heat absorption of the inner pot 3 becomes uniform, and moreover, it works by the function of the polycarbosilane varnish component and silicone oil in the composition. Outer surface 6 of kettle 3 and outer surface 1 of hot plate 5
Since the water repellent of 0 is improved, it is possible to prevent the inner pot 3 and the hot plate from being corroded due to the adhesion of water, and
Since dirt or the like does not stick to the outer surface 6 of the inner pot 3 and the outer surface 10 of the heating plate 5, the dirt and the like can be easily removed and the cleaning performance can be improved.

[0024]

[Table 1]

In the above embodiment, a disc-shaped heating element may be used instead of the sheath heater 7 provided in the heating plate 5 to heat the inner pot 3, and the embodiment is limited to the above embodiment. There is no such thing.

[0026]

As described above, in the electric rice cooker of the present invention, the invention according to claim 1 is characterized in that the outer surfaces of the inner pot and the heating body are coated with a black treatment film for improving the heat absorption rate. The bottom of the outer surface of the inner pot is heated by heat conduction by the heating body, and the radiant heat from the heating body is absorbed by the side portion of the outer surface of the inner pot to heat the inner pot, and the heat is absorbed by the side portion of the inner pot. The radiant heat that has not been absorbed is absorbed by the outer surface of the heating element and heats the heating element so that the heating element can be quickly raised to the maximum temperature, so that the rice can be cooked deliciously without prolonging the cooking time. it can.

Further, in addition to the effect of claim 1, the invention according to claim 2 provides a treatment film having a high heat absorption rate on a side portion of the outer surface of the inner pot, and a bottom of the outer surface of the inner pot. By applying a treatment film having a lower heat absorption rate than the treatment film, the heat absorption rate at the outer side of the inner pot having a lower heat absorption rate is increased, and the heat absorption rate at the bottom of the outer surface having a higher heat absorption rate is decreased. Since the heat absorption rate on the outer surface of the inner pot is made uniform by doing so, it is possible to cook rice without unevenness in cooking.

Further, the invention according to claim 3 is the same as claim 1.
Alternatively, in addition to the effect of claim 2, the treatment film of the heating element is made of a radiant substance that emits far infrared rays, and the treatment film of the inner pot is made of an absorbing substance that absorbs far infrared rays. Radiant heat including far infrared rays is absorbed by the outer surface of the inner pot and heats the inner pot, so that rice can be cooked deliciously without further prolonging the cooking time.

Moreover, the invention according to claim 4 is the same as claim 1.
Alternatively, in addition to the effects according to claim 2 or claim 3, the treated film is made of a heat-resistant ceramic material having water repellency and lubricity, so that the outer surface of the inner pot and the heating body can be easily repelled by water. Therefore, it is possible to prevent corrosion of the inner pot and the heating element due to the adhesion of water, and to prevent dirt from sticking to the outer surface of the inner pot and the heating element. Since it can be easily dropped, it is possible to improve the cleanability.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an essential part showing an embodiment of an electric rice cooker of the present invention.

FIG. 2 is a longitudinal sectional view of a main part of an inner pot showing another embodiment of the electric rice cooker of the present invention.

FIG. 3 is a bottom view of the essential parts of the inner pot showing another embodiment of the electric rice cooker of the present invention.

FIG. 4 is a longitudinal sectional view of a main part of a conventional electric rice cooker.

[Explanation of symbols]

 1 rice cooker main body 3 inner pot 5 hot plate 6 outer face of inner pot 6a bottom of outer face of inner pot 6b side of outer face of inner pot 10 outer face of hot plate 11 treatment film

Claims (4)

[Claims] 1. An electric rice cooker in which an inner pot is detachably mounted in a rice cooker body and a heating body for heating the inner pot is provided at a lower portion of the inner pot, wherein an outer surface of the inner pot and the heating body. An electric rice cooker characterized in that a black treatment film for improving heat absorption rate is applied to the. 2. A treatment film having a high heat absorption coefficient is applied to a side portion of the outer surface of the inner pot, and a treatment film having a heat absorption coefficient lower than that of the treatment film is applied to a bottom portion of the outer surface of the inner pot. The electric rice cooker according to claim 1, wherein: 3. The treatment film of the heating body is made of a radiant substance that emits far infrared rays, and the treatment film of the inner pot is made of an absorbing substance that absorbs far infrared rays. The electric rice cooker according to claim 1 or claim 2. 4. The electric rice cooker according to claim 1, 2 or 3, wherein the treatment film is made of a heat-resistant ceramic material having water repellency and lubricity.