JPS61234820A - Rice cooker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a rice cooker that is used on a daily basis in general households.

Conventional technology In conventional rice cookers, it is important to efficiently transfer the heat from the rice heater to the water or rice in the inner pot.

The issue has been how to improve thermal efficiency.

Various types of rice cookers have been proposed to solve this problem, but all of them have complicated configurations.

On the other hand, recently, cooking utensils that utilize far-infrared radiation for heating have been proposed, such as pots, frying pans, and even hot plates.

For example, as shown in Japanese Utility Model Application Publication No. 59-16526, the inner surface of a metal cooking utensil body is coated with a layer of far-infrared emitting ceramic particles, and the ceramic particle layer is coated with a synthetic resin layer. Ya, Utsukai Showa 69-717
As shown in Publication No. 18, an alumite layer and ZrO2+ are coated on the inner surface of a roughened aluminum metal utensil.
A single layer of fluororesin primer containing one or three far-infrared radioactive substances of S-02 and TiO2,
Various proposals have been made, including one in which fluororesin layers containing similar far-infrared emitting substances are sequentially laminated.

However, as mentioned above, all of these have been applied to products such as pots, frying pans, and hot plates, and there has yet to be an example of applying far-infrared radiation heating to a rice cooker. Ta.

Also, as shown in Utility Model Publication No. 56-11847, -
已 -U l２、 disorder、tsugo 2I2: ２f disordertsu）!
(In addition to conventional induction and convection, there is also a method of efficiently transmitting the heat from the rice-cooking heater and heat-retaining heater to the inner pot by applying black treatment to the inner wall of the appliance body facing two floors, but this method uses radiation instead of conventional induction and convection. Until now, there was no way to efficiently transfer the heat from the pot to the water and rice, or how to improve thermal efficiency by treating the inner surface of the inner pot.

Problems to be Solved by the Invention As mentioned above, there is no example of applying a heating method using far-infrared radiation to a rice cooker. The idea is to use a heating method using far-infrared radiation as a means of transmitting heat to water or rice.

However, in the method of covering the ceramic particle layer of far-infrared emitting material with a synthetic resin layer, which has already been proposed for other cooking utensils, the far-infrared rays emitted from the ceramic particle layer are canceled out or changed by the synthetic resin layer. Therefore, it is not desirable.

On the other hand, fluorine tree f4fii [CZrO2,5in2
Also, H-jTio2 Te Unami, voice Te? ′,≠37! The infrared absorption characteristics (3
micron, 7 micron, and 15 micron), and it cannot be said to be an ideal far-infrared emitting material.

The present invention improves the drawbacks of the far-infrared radiation heating method conventionally applied to cooking utensils such as pots and frying pans, and provides a system that efficiently transfers heat from a rice-cooking heater to water or rice in an inner pot. The purpose is to provide a rice cooker with high thermal efficiency.

Means for Solving the Problems In order to solve the problems, the present invention uses nickel oxide as a main component as a far-infrared emitting substance.

A mixture containing at least one of iron oxide, cobalt oxide, and manganese oxide as an impurity is used, and the inner surface of the inner pot is coated with a fluororesin containing the far-infrared emitting substance.

Function: Generally speaking, when heating something, thermal efficiency is greatly influenced by how well the radiation characteristics of the object to be heated match the infrared absorption characteristics of the object to be heated. especially.

In a rice cooker, it is important to heat water efficiently.
Ideally, heating should be done using a substance with far-infrared radiation characteristics that closely match the infrared absorption characteristics of water.

However, ZrO2 and SiO□ have already been proposed.

And TiO2 has excellent far-infrared radiation characteristics in the long wavelength region north of 10 microns, but is inferior in radiation characteristics at 3 and 7 microns, which correspond to the infrared absorption characteristics of water below 1Q microns.

On the other hand, the nickel oxide used in the present invention is.

ZrO□, which is also called a high-efficiency radiation material, has been proposed in the past because it shows excellent radiation characteristics not only at 3 microns and 7 microns, but also in the long wavelength region of 10 microns or more.

Nickel oxide is considered to be superior to SiO□ and TiO□ in terms of application to rice cookers. By the way, what about high purity nickel oxide?

It has a green color, and like conventional ZrO2 and SiO2, stains from cooking are noticeable, which is not very desirable. For this reason, the present invention intentionally adds impurities to nickel oxide, including at least one of iron oxide, cobalt oxide, and manganese oxide, to make it blackish. This was done with care to ensure that the

In addition, iron oxide, cobalt oxide, and manganese oxide used as impurities are similar to the main component nickel oxide.
It belongs to what is called a high-efficiency radioactive material, and has extremely high radioactive properties.Even if these substances are added to nickel oxide,
It does not significantly reduce the radiation properties of nickel oxide.

Furthermore, by incorporating these far-infrared emitting substances into the fluororesin, it is possible to suppress a decrease in the corrosion resistance of the inner pot, and it is also possible to prevent rice from sticking.

For these reasons, it is possible to drain the water in the inner pot at a high rate without impairing the characteristics of the conventional fluororesin-coated inner pot. It becomes possible to obtain.

Embodiment One embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a rice cooker according to an embodiment of the present invention.
In FIG. 1, reference numeral 1 denotes a device main body whose at least an inner wall 2 is made of metal with good heat conduction, and a heat insulating material 4 is interposed between the inner wall 2 and outer wall 3 of the device main body 1. Reference numeral 6 denotes a heat-retaining heater arranged in an annular manner on the back surface and part of the inner wall 2 of the appliance body, 6 a rice-cooking heater equipped on the inner bottom surface of the inner wall 2 of the appliance body 1, and 7 a heater made of metal with good thermal conductivity. The inner pot 7 has a cylindrical bottom shape, and is placed closely on the rice-cooking heater 6J, and is housed in the device body 1 with a slight gap from the inner wall 2 of the device body 1. It is configured as follows.

8 is an insulating lid that covers the northern opening of the main body 1, and 9 is an inner pot 7.
A metal inner cover that covers the front opening is detachably connected to the heat insulating cover 8.

In addition, as shown in Figure 2, the inner surface of the inner pot 7 is as shown in Table 1.
It is coated with a fluororesin 7b containing 20% by weight of a far-infrared emitting substance 7a made of a mixture.

Table 1 In order to compare with the rice cooker according to the embodiment of the present invention, as a conventional example, a rice cooker in which the inner surface of the inner pot 7 is coated with a fluororesin 7b that does not contain any far-infrared emitting substance T&; As Comparative Examples 1 and 2, the inner surface of the inner pot 7 was coated with 2 liters of far-infrared emitting material 71L of ZR02 or SiO□.
Rice cookers each coated with fluororesin 7b containing 0% by weight were prepared.

In order to evaluate each rice cooker, a constant power consumption was applied to the rice cooker, the time required to complete rice cooking was determined, and the heat efficiency was calculated based on the rice cooking time, and the results are shown in Table 2.

The thermal efficiency was 100% in the case of a conventional rice cooker using an inner pot coated with a fluororesin 7b that did not contain any far-infrared emitting substance 7&.

Table 2 As is clear from Table 2, compared to the conventional example using only fluororesin 7b, Comparative Examples 1 and 2 treated with fluororesin containing 20% by weight of ZrO□ or Sio2 had a % or 5%, but in the rice cooker of the present invention treated with fluororesin 7b containing a mixture mainly composed of nickel oxide, the thermal efficiency was increased by 16% compared to the conventional example. A remarkable effect was obtained.

As described above, by coating the inner surface of the inner pot 7 with the fluororesin 7b containing 20% by weight of a mixture mainly composed of nickel oxide as the far-infrared emitting substance 71L, thermal efficiency could be significantly increased.

Moreover, no particular sticking of rice was observed during cooking, and the same characteristics as the inner pot 7 coated with a conventional fluororesin were obtained.

Note that in the embodiment of the present invention, far-infrared emitting material 7
As 1L, a mixture having the composition shown in Table 1 was used,
It is not particularly limited to this.

Any mixture containing nickel oxide as a main component and at least one of iron oxide, cobalt oxide, and manganese oxide as an impurity may be used.

Further, although the amount contained in the fluororesin 7b was 20% by weight in the embodiment of the present invention, it is not particularly limited.

However, the content of the above-mentioned far-infrared emitting substance 71L in the fluororesin 7b is ideally in the range of 6 to 40% by weight. This is because if it is less than 6% by weight, the far-infrared radiation characteristics will deteriorate and there will be no effect on thermal efficiency.
On the other hand, if it exceeds 40% by weight, the corrosion resistance of the fluororesin 7b will be significantly reduced and the phenomenon of rice sticking will increase, making it impossible to put it into practical use.

Effect of the invention As is clear from the following description, according to the present invention.

As a far-infrared emitting material, nickel oxide is the main component,
This is because a mixture containing at least one of iron oxide, cobalt oxide, and manganese oxide as impurities is used, and the inner surface of the inner pot is coated with a fluororesin containing the far-infrared emitting substance.

It is possible to provide a rice cooker with excellent thermal efficiency.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a rice cooker showing one embodiment of the present invention;
The figure is an enlarged sectional view of the main part of the inner pot in the same rice cooker. 7... Inner pot, 73... Far infrared emitting material, 7b... Fluorine resin.

Claims (1)

[Claims] As a far-infrared emitting material, nickel oxide is the main component,
A rice cooker, characterized in that a mixture containing at least one of iron oxide, cobalt oxide, and manganese oxide as impurities is used, and the inner surface of the inner pot is coated with a fluororesin containing the far-infrared emitting substance.