JP2000287832A - Rice cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To capture and deodorize an offensive smell generated at rice cooking and heat reserving time, to freely discharge an offensive smell component, and to reproduce a deodorant by applying deodorant-added paint to a part for passing the offensive smell by rice cooking and heat reservation, and constituting the applying base material so as to be timely heated to a specific temperature. SOLUTION: This rice cooker of a type for heating a pot by electromagnetic induction heating has an electromagnet induction heating coil 1, ferrite 2, a pot bottom temperature detecting sensor 3, a heating control base board 4, a cooling fan 5, an operation part 6, a heating plate 7, a steam cap 8 and a pot 9 as main constitutive parts. In this case, a fluororesin coat 11 blended with a deodorant 10 is applied to an inside surface of the heating plate 7 of a cover 14 so that an unpleasant offensive smell component such as an aldehyde substance generated at rice cooking or heat reserving time is adsorbed to the deodorant 10. The deodorant 10 can be reproduced by discharging the offensive smell component by inductively heating the heating plate 7 by current-carrying to an electromagnetic induction heating coil 12 attached to the outside surface side of the heating plate 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rice cooker used for ordinary households and businesses.

[0002]

2. Description of the Related Art In a rice cooker, an appropriate amount of rice and water are put into a pot provided in the rice cooker, and the rice cooking process is completed by being heated. Immediately after the end of the process, the process is moved to a warming process.

Further, these rice cookers are composed of a pot made of metal such as aluminum or stainless steel, a means for heating the pot, a means for controlling the heating of the pot, an inner lid, a heating plate,
The main component is a steam port or a steam tube, which is a passage for steam.

[0004]

By the way, rice contains various components such as starch, proteins, lipids, vitamins and minerals in addition to water. Therefore, when rice is cooked in the rice cooking process, various odor components are generated.These odor components are important for producing the unique flavor of rice. The odor component is slightly different depending on whether it is new rice or old rice. However, while these odor components are important for producing the flavor of rice, particularly when used rice is cooked, it emits an unpleasant odor called old rice odor.

[0005] In the warming process after the rice cooking process,
An unpleasant odor called a heat retention odor due to oxidation of rice and propagation of heat-resistant bacteria is generated, and particularly when the temperature is kept for a long time or at a low temperature of 70 ° C. or lower, the symptoms are remarkable, and the deterioration of the rice is accelerated.

It has been found that these unpleasant odor components involve the generation of alcoholic substances and carboxylic acid substances in addition to aldehyde substances such as pentanal and n-hexanal. It has been an issue to remove and reduce these odor components in the process.

Further, when an attempt is made to remove these unpleasant odor components by using a conventional deodorant made of activated carbon,
Although effective initially, the adsorption of unpleasant odor components quickly reaches the saturation limit, and no further effects can be expected. For this reason, frequent replacement of the deodorant, or an impractical operation such as removing the deodorant from the rice cooker and recalcining at a high temperature of several hundred degrees Celsius to regain the adsorption activity is required. Therefore, development of a rice cooker equipped with a deodorizing means that does not require replacement or regeneration processing has been an issue.

[0008]

In order to overcome the above problems, the present invention provides a zirconium phosphate-based, zirconium oxide-based, titanium oxide-based, silica-based, and magnesium oxide-based system that selectively adsorbs unpleasant odor components. Applying a paint containing an aluminum oxide-based deodorant to a portion through which odor passes, or disposing a resin material component to which these deodorants are added at a portion through which odor passes, A rice cooker provided with means for heating a resin material part to 120 ° C. or higher, which captures odors generated during rice cooking and heat retention, reduces odor components, and uses a deodorant for one.
By heating to 20 ° C. or more as appropriate, an odor component is released and re-adsorption is enabled.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 is a zirconium phosphate-based, zirconium oxide-based, titanium oxide-based, silica-based, magnesium oxide-based, and aluminum oxide-based deodorant that selectively adsorbs unpleasant odor components. With a concentration of 0 in the coating film.
A rice cooker provided with a means for applying a paint added with 1 to 5% by weight to a portion through which an odor passes, such as an inner lid, a radiator plate, and a steam tube, and further heating the applied base material to 120 ° C. or higher, Unpleasant odors generated during rice cooking and heat retention are absorbed by the deodorant of the coating film, reducing unpleasant odor components filling the rice cooker pot,
The flavor of rice can be kept without losing the flavor for a long time, and a heater and an induction heating mechanism for heating the substrate coated with the deodorant to 120 ° C or higher are provided. By heating, the adsorbed unpleasant odor component is released in a timely manner, and is capable of re-adsorption to provide a long-term practical durability.

The invention according to claim 2 provides a zirconium phosphate type, a zirconium oxide type, a titanium oxide type, a silica type, a magnesium oxide type, which selectively adsorbs an unpleasant odor component.
A resin material part to which 0.1 to 5% by weight of an aluminum oxide-based deodorant is added is provided in a part such as a steam tube or a lid through which odor passes, and a means for heating the resin material to 120 ° C. or more is provided. It is a rice cooker, and the unpleasant odor generated during cooking and warming is absorbed by the deodorant of the coating film, reducing the unpleasant odor component filling the rice cooker pot and keeping the flavor of rice without losing the flavor for a long time It has a heater and an induction heating mechanism for heating the substrate coated with the deodorant to 120 ° C or higher, so that the adsorbed unpleasant odor component can be removed by heating the substrate to 120 ° C or higher in a timely manner. It is characterized by a structure that has a long-term practical durability by releasing it in a timely manner and enabling re-adsorption.

The invention according to claim 3 is the rice cooker according to claim 1 or 2, wherein a plurality of types of deodorants that selectively or non-selectively adsorb unpleasant odor components are used. It is characterized by being able to simultaneously absorb and deodorize unpleasant odors of component systems.

The invention according to claim 4 is a rice cooker using a zirconium phosphate-based, zirconium oxide-based, titanium oxide-based, silica-based, magnesium oxide-based, or aluminum oxide-based deodorant as a deodorant. Various odors can be selectively adsorbed and deodorized depending on the substances to be supported.

[0013]

(Embodiment 1) A first embodiment of the present invention will be described below with reference to FIG. FIG. 1 shows a rice cooker of a type in which a pan is heated by electromagnetic induction heating, and includes an electromagnetic induction heating coil 1, a ferrite 2, a pan bottom temperature detection sensor 3, a heating control board 4, a cooling fan 5, an operation unit 6, a heating plate 7, The steam cap 8 and the pot 9 are main components, and during cooking rice, rice and water are added in appropriate amounts in the pot to cook and heat the rice, and this process is executed under the control of the microcomputer.

In this embodiment, a silica-based deodorant (N
S-103 Toa Gosei Co., Ltd.) was added to a 1% by weight fluorine resin coating material, and applied to both surfaces of the heating plate 7 made of ferritic stainless steel so that the film thickness would be 25 microns.

The silica-based deodorant used here (NS-1)
03 Toa Gosei Co., Ltd.) has a selective adsorption effect on aldehyde-based substances.

Further, an electromagnetic induction heating coil 12 is arranged inside the lid 14, so that the heating plate 7 made of ferritic stainless steel can be induction-heated as needed.

In the above configuration, the aldehyde-based substance generated during cooking or keeping the temperature of the rice is adsorbed by the deodorant 10 in the fluorine resin coat 11.

In addition, since the deodorizing agent 10 has a reduced adsorbing ability when the adsorption proceeds to some extent, it is necessary to regenerate the adsorbent by heating. For this purpose, in the pre-cooking step of the rice cooking step shown in FIG. It can be released from the inside and released to the outside of the rice cooker through the steam port 19 together with the steam during cooking. This step may be performed in another step during rice cooking, or in a state where the rice cooker is not used,
It is also possible to execute the process during a so-called standby state. In this case, the unpleasant odor-causing substance that has similarly separated is discharged out of the rice cooker through the steam port 19. Here, the temperature and time for heating the heating plate may be arbitrarily set in consideration of the thickness of the coating film, the heat resistance of the coating film, the influence on peripheral components, and the like. It is desirable to carry out at a temperature of not less than 5 ° C. for not less than 5 minutes. By incorporating the deodorant heating and regeneration process as described above, the deodorizing performance can be maintained for a long period of time.

Further, the type and amount of the deodorant,
The type of coating substrate, the type of coating, the film thickness, etc. are optional,
As the deodorant, a substance that efficiently adsorbs aldehyde-based substances, alcohol-based substances, and carboxylic acids, which are substances that cause bad odor of rice, is preferred.The amount of the deodorant has a deodorizing effect and does not impair the original performance of the coating film The content is practically 0.1 to 5% by weight, and the coating base material can be any type of steel as long as it can be subjected to induction heating, and the coating material is free depending on the purpose, such as fluorine or silicon. Further, in the present embodiment, a coating material to which a deodorant has been added is applied to both surfaces of the heating plate 7, but this treatment may be performed on only one surface.

(Embodiment 2) Hereinafter, a second embodiment of the present invention will be described. The main configuration is the same as that of the first embodiment.
In this example, as shown in FIG. 3-a, a zirconium phosphate-based deodorant (NS-80E Toa Gosei Co., Ltd.)
1% by weight polyphenylene sulfide resin (PPS)
And formed into a steam cylinder 15. further,
A heater 16 is wound around the steam cylinder so that the steam cylinder can be appropriately heated to 150 ° C. or higher.

In the above configuration, similar to the first embodiment,
The malodorous substances generated during rice cooking or heat retention are adsorbed by the deodorant in the steam cylinder, and the deodorant is heated and regenerated by heating the steam cylinder by a heater at 150 ° C. for 5 minutes in a cooking step before rice cooking or in a standby mode, Deodorizing performance can be maintained for a long time.

In the second embodiment, the steam cylinder 15 is made of PPS resin and the deodorant 20 is added thereto. However, as shown in FIG. May be provided, and the heater 16 may be wound around the outside of the steam cylinder. Furthermore, if the metal portion 17 is made of a metal capable of induction heating such as ferrite stainless steel, an electromagnetic induction coil can be applied instead of the heater. Further, as in Example 1, the type and amount of the deodorant, the type of the applied base material, the type of the coating material, the film thickness, and the like are arbitrary, but a material that sufficiently considers heat resistance and vapor resistance is desired. .

In the first and second embodiments, examples in which the deodorizer and its heating mechanism are applied to a heating plate and a steam cylinder are introduced. There is no problem if the present invention can be applied to a plurality of places, and even if this mechanism is used at a plurality of places in a rice cooker.

Hereinafter, the results of the test for confirming the deodorizing effect using Examples 1 and 2 will be described with reference to FIG. Assuming that the peak area of n-hexanal immediately after rice cooking is detected by gas chromatography and the peak area is set to 100, the peak area after 3 hours of heat retention after rice cooking is reduced to 8 in Example 1 and 23 in Example 2. This indicates that the n-hexanal concentration has been significantly reduced. On the other hand, in the untreated rice cooker, the decrease in n-hexanal is very small even after the elapse of the heat retention time.

Further, as shown in FIG. 5, this rice cooker has a deodorizing effect substantially equal to the initial stage even after rice is cooked 100 times, and long-term sustainability can be confirmed by the heat regeneration treatment of the deodorant. .

[0026]

As described above, the rice cooker of the present invention has a deodorizing function and a mechanism for regenerating the deodorizing function. It is possible to remove the migratory and provide high quality rice to the user.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a rice cooker according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a standard rice cooking process of the rice cooker.

FIG. 3 is a sectional view of another essential part of the rice cooker.

FIG. 4 is a transition characteristic diagram of the concentration of n-hexanal in a rice cooker cabinet.

FIG. 5 is a transition characteristic diagram of the concentration of n-hexanal in a rice cooker after cooking rice 100 times.

[Explanation of symbols]

 7 Heating plate 10 20 21 Deodorant 11 Fluoro resin coating 12 Electromagnetic induction heating coil 13 18 Temperature detection sensor 14 Lid 15 Steam cylinder 16 Heater 17 Steam cylinder metal part 22 Coating layer

Claims (4)

[Claims] 1. A rice cooker in which a paint to which a deodorant has been added is applied to one or more sites through which odor due to cooking and keeping heat passes, and the applied base material is heated to 120 ° C. or more in a timely manner. 2. A rice cooker comprising one or more resin material parts to which a deodorant has been added at a site through which odor passes due to rice cooking and heat retention, and wherein the resin material is appropriately heated to 120 ° C. or more. 3. The rice cooker according to claim 1, wherein a plurality of types of deodorants are mixed. 4. A zirconium phosphate-based deodorant,
A zirconium oxide type, a titanium oxide type, a silica type, a magnesium oxide type, and an aluminum oxide type.
3. The rice cooker according to any one of 3.