JPS61234819A - 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, the problem is how to efficiently transfer the heat from the rice-cooking heater to the water or rice inside the inner pot to increase thermal efficiency, and how to make old rice work as well as new rice. The issue has been whether or not it can be cooked deliciously.

For this reason, as shown in Japanese Utility Model Publication No. 56-11847, there are various methods such as blackening the outer surface of the inner pot and the inner wall of the appliance body facing the outer surface of the inner pot, and other similar methods. However, all of these proposals propose how to transfer heat to the inner pot, and there are also proposals that go so far as to efficiently transfer heat from the inner pot to water or rice. The reality is that there are almost no suggestions for how to cook food deliciously.

Problems to be Solved by the Invention The above-mentioned method of applying black treatment to the outer surface of the inner pot and the inner wall of the appliance body opposite to the outer surface of the inner pot, and similar methods, do not solve the problem of heat transfer in addition to heat conduction and convection. This method makes good use of radiation, and allows the heat from the rice-cooking heater and the heat-retaining heater to be efficiently transferred to the inner pot.

However, with the method described above, it is questionable whether the heat transferred to the inner pot can be efficiently transferred to the rice even if there is still water inside the inner pot. That is not something that can be expected.

The present invention aims to improve these problems by efficiently transmitting the heat from the rice cooker to the water or rice in the inner pot, thereby increasing the thermal efficiency of the rice cooker and making it possible to use old rice even when using old rice. The purpose is to provide a rice cooker that can cook rice deliciously.

Means for Solving the Problems In order to solve the above problems, the present invention provides that the inner surface of the inner pot is
Hos, 5iOz, ZrO2,TiO2,N
The outer surface of the inner pot is coated with a fluororesin containing a far-infrared emitting substance made of at least one substance or compound of ip, Fe2es, and Mn0z, and the outer surface of the inner pot is blackened.

In order to increase thermal efficiency in a rice cooker, it is important to (1) efficiently transfer the heat from the rice-cooking heater to the inner pot, and (2) efficiently transfer the heat transferred to the inner pot to the water and rice. Unless either of these is satisfied, it is impossible to significantly increase the thermal efficiency of the rice cooker.

Here, in order to increase the thermal efficiency of the former, it is possible to blacken the outer surface of the inner pot, as has been previously proposed. This is clear from the physical fact that heat absorption is best achieved by making the heat absorbing body black, as has been conventionally said.

On the other hand, in order to increase the latter thermal efficiency, the inner surface of the inner pot may be treated to have radiation characteristics that match the infrared absorption characteristics of water or rice (main ingredient starch). This is clear from the theory that, in general, in order to efficiently heat an object, it is necessary that the radiation characteristics of the object to be heated and the infrared absorption characteristics of the object to be heated match well. Therefore, in order to efficiently heat water or rice that has a large absorption peak in the long wavelength region of 5 microns or more, that is, in the far infrared region, excluding the infrared absorption peak around 3 microns, it is necessary to radiate far infrared rays from the inner surface of the inner pot. All that is required is a coating treatment with a substance with excellent properties.

However, with the conventional inner pot coated with fluororesin,
The radiation characteristics in the far-infrared region described above are poor, and it is not possible to efficiently heat the objects to be heated, such as water or rice.

Therefore, by incorporating a far-infrared emitting substance into a conventional fluororesin as in the present invention, the far-infrared radiation characteristics can be significantly improved compared to the conventional fluororesin, and water or rice can be heated efficiently. be able to. On the other hand, far infrared rays
It has strong penetrating power, penetrating deep into the rice, acting on the starch, which is a component of rice, and working to change the deterioration of starch found in old rice to the original state of new rice, converting old rice into conventional new rice. It is said that even if you cook rice using the same method, it will taste as delicious as new rice.

In this way, by treating the inner surface of the inner pot with a fluororesin containing a far-infrared emitting substance and blackening the outer surface, it is possible to significantly increase the thermal efficiency of the rice cooker, and also to avoid using old rice. It can also be cooked deliciously.

In addition, as a far-infrared emitting substance, 11203. SiO2, Zr
Any substance or compound of at least one of O2°TiO2, NiO, Fe2O2 and MnO2 may be used.

In addition, the content of these far-infrared emitting substances is 5% by weight ~
A range of phantom weight % is good. This is because if the amount is too high, the effect of conventional fluororesin will be significantly reduced and problems such as rice sticking will occur, and if it is too little, the far-infrared radiation characteristics will deteriorate and the above-mentioned effects will not be seen.

On the other hand, the blackening method may be any method such as a painting method or a chemical coloring method.

EXAMPLE Hereinafter, an example of the present invention will be described based on the accompanying drawings.

FIG. 1 shows a rice cooker according to an embodiment of the present invention. In FIG. 2
A heat insulating material 4 is interposed between the outer wall 3 and the outer wall 3. 5 is a heat-retaining heater arranged in an annular manner on the upper back surface of the inner wall 2 of the appliance body 1, θ is a rice-cooking heater equipped on the inner bottom surface of the inner wall 2 of the appliance body 1, and 7 is made of metal with good heat conduction. The inner pot 7 is a cylindrical inner pot with a bottom, and is placed closely on the rice-cooking heater 6 and is housed in the utensil main body 1 with a slight gap from the inner wall 2 of the utensil main body 1. It is configured as follows. 8
Reference numeral 9 indicates a heat insulating lid that covers the upper opening of the main body 1, and 9 indicates a metal inner cover that covers the upper opening of the inner pot 7, which is detachably connected to the heat insulating lid 8.

Moreover, as shown in FIG. 2, the inner surface of the inner pot 7 is Zr0z
The outer surface of the inner pot 7 is coated with a fluororesin 7b containing 20% by weight of a far-infrared emitting material 71L consisting of
Black processing 7c is applied.

In the above configuration, the heat generated from the rice cooking heater 6 is
The heat is transferred to the inner pot 7 via the black treatment 7G by conduction and absorption of heat. The heat transferred to the inner pot 7 is radiated by far infrared rays by the far infrared emitting material 71L contained in the fluororesin 7b whose inner surface is coated, and in addition to the conventional heat transfer by convection and conduction, With the addition of far-infrared radiation, water and rice can be heated efficiently, and the far-infrared rays reach the inside of the rice, making it possible to cook the rice deliciously.

In addition, in the embodiment of the present invention, the far-infrared emitting material 7
Although ZrO2 was used as a, it is not particularly limited to this, and ZrO2, SiO2, TiOz
.

At least one or more of Nip, Fe2e5 and MnO2 or a compound may be used. Further, although the amount of the far-infrared emitting substance 7a contained in the fluororesin 7b was set to 20% by weight in the embodiment of the present invention, it is not particularly limited to this either.

Effects of the Invention As is clear from the above explanation, according to the present invention, the inner surface of the inner pot is coated with Muhos, 5iOz, ZrO2, TiO.
2. Coating with a fluororesin containing a far-infrared emitting substance consisting of at least one substance or compound of Fe2es and MnO2,
Since the outer surface of the inner pot is black-treated, the heat efficiency of the rice cooker can be increased, and even old rice can be cooked deliciously.

[Brief explanation of drawings]

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, 7a... Far infrared emitting material, 7b... Fluorine resin, 7G... Black treatment. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 7...Internal disaster

Claims (1)

[Claims] The inner surface of the inner pot is made of Al_2O_3, SiO_2, ZrO_
2, TiO_2, NiO, Fe_2O_3 and MnO
A rice cooker characterized in that the inner pot is coated with a fluororesin containing a far-infrared emitting substance made of at least one substance or compound of _2, and the outer surface of the inner pot is blackened.