JP2003245203A - Heating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To restrain deterioration of an object to be heated. <P>SOLUTION: The heating device (rice cooker) includes a cover body 7 for closing opening of a device body 2, an inner container (rice cooker pot 1) disposed on the inside of the device body 2, a heating means (induction heating coil 5) for heating the inner container, a heat (inner cover body 17) disposed at the upper part of the inner container, and an exhaust channel for discharging steam generated in the inner container. An oxide film layer 18 containing at least one of silver and copper is provided at least at a part of the surface of the heat sink or exhaust channel. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating device such as a rice cooker, a soup jar, an electric pot, and a humidifier for heating an object to be heated contained in an inner container having a closed inside. Is.

[0002]

2. Description of the Related Art In this type of heating device, an inner container is provided inside the main body of the device, and ingredients to be cooked, water, etc. are set in the inner container, and these objects to be heated are passed through the inner container. It is heated by a heating means.

[0003]

However, such a heating device has a problem that the heated object deteriorates due to deterioration over time.

Therefore, the present invention provides a heating device capable of suppressing the deterioration of the object to be heated.

[0005]

In order to solve the above-mentioned problems, a heating device of the present invention comprises a lid for closing the opening of the device body, an inner container arranged inside the device body, and the inner container. In a heating device comprising a heating means for heating the inner container, a heat radiating plate disposed on the upper part of the inner container, and an exhaust path for discharging vapor generated in the inner container, the heat radiating plate or the exhaust path An oxide film layer containing at least one of silver and copper is provided on at least a part of the surface of the.

According to the above heating device, silver or copper ions having excellent antibacterial properties act on the object to be heated through the water vapor in the air on the object to be heated contained in the inner container. In addition, it is possible to prevent the dew condensation water in the heat sink or the exhaust passage from spoiling, and as a result, it is possible to prevent the spoiled water from adhering to the object to be heated. As a result, it is possible to suppress deterioration such as decay of the object to be heated.

It is preferable that the lid is removably attached to an upper portion of the device body, and the heat dissipation plate is an inner lid detachably attached to the lid.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a rice cooker that is a heating device according to an embodiment of the present invention. This rice cooker comprises a rice cooker pot 1 which is an inner container for containing an object to be heated, a main body 2 which detachably accommodates the rice cooker pot 1, and a lid 7 which is rotatably attached to the main body 2. .

The rice cooker 1 is electromagnetically induced by an eddy current generated when a high-frequency current is applied to the induction heating coil 5, which is the heating means of this embodiment, on the outer surface of the pan base material made of aluminum or the like having a high thermal conductivity. A ferromagnetic material to be heated is coated or bonded.

The main body 2 is provided with a protective frame 4 made of a non-conductive material for accommodating the rice cooking pot 1 inside a body 3 having a bottomed cylindrical shape. A well-known structure in which an induction heating coil 5 as a heating unit, a rice cooking pot temperature sensor 6, and a control board on which a microcomputer (not shown) is mounted are arranged between the body 3 and the protective frame 4. Is.

The lid 7 is openably and closably attached to the upper portion on the back side of the main body 2 (upper right side in FIG. 1) and closes the opening portion of the main body 2, and includes an upper plate 8 and a lower plate 12.
And an inner lid 16 that is detachably attached to the bottom surface of the lower plate 12 to seal the opening of the rice cooking pot 1.

The upper plate 8 is provided with an exhaust port 9 for exhausting vapor to the outside (atmosphere), and an annular frame wall 10 is provided so as to surround the exhaust port 9 so as to project downward. 10
An exhaust duct 11 forming an exhaust path is attached to the.

The lower plate 12 has a well-known hinge connection structure which is mounted on the main body 2 so as to be opened and closed.
A heater cover 13 is provided, and a lid heater 14 is provided between the heater cover 13 and the lower plate 12. Further, the lower plate 12 is formed with a housing portion 15 for housing the exhaust duct 11 and a pressure regulator 22 described later.

The inner lid 16 has a structure as shown in FIG. 1 and FIG.
As shown in (B), the inner lid main body 17 and the seal member 20.
And a resin frame 21.

The inner lid body 17 covers the upper end opening of the rice cooking pot 1 and serves as a heat radiating plate. An oxide film layer 18 containing silver is provided on the surface of aluminum as a base material. ing. The inner plate main body 17 includes the lower plate 12
A discharge port 19 that communicates with the rice cooking pot 1 is provided at a position facing the housing portion 15, and a pressure regulator 22 is fixed to the exhaust port 9.

The oxide film layer 18 is formed by immersing it in an electrolytic bath in which an electrolytic solution containing silver salt as a metal salt is stored. In this case, the electrolytic solution is sulfate 5
~ 30g / l, boric acid 20-35g / l, sulfuric acid 0.1-1.0g /
The well-known composition designated as l can be applied. The electrolyte contains
For example, nitric acid 10-30g / l, nickel nitrate 10-30g / l
Etc. may be added. Then, a voltage of 5 to 3 is applied to the electrolytic solution.
While energizing a 5V AC power supply, 5 to 2 in the electrolytic solution
Try to keep the temperature at 5 ° C. The composition, quantity, voltage, temperature, etc. of the electrolytic solution are not necessarily limited to these.

The seal member 20 is a ring-shaped member which is in close contact with the inner peripheral surface of the opening of the rice cooking pot 1. The seal member 20 is arranged on the outer peripheral edge of the inner lid main body 17 and then a resin frame 21 is attached to the inner lid main body. It is fixed to 17.

The resin frame 21 is an annular member which is attached to the lower surface of the outer peripheral portion of the inner lid main body 17 so as to sandwich the seal member 20 with the inner lid main body 17 and fix the seal member 20 irremovably. .

The pressure regulator 22 includes a pressurizing mechanism 23 for applying a pressure higher than atmospheric pressure into the rice cooking pot 1, and the pressurizing mechanism 2
3 is a drive mechanism 24 for driving the solenoid. The pressurizing mechanism 23 is integrally fixed so as to cover the discharge port 19 of the inner lid body 17, and is generally a check valve 2.
5, the pedestal member 26, the pressure-adjusting ball 27, and the cap 28 constitute a part of the exhaust path.

In the rice cooker having the above-mentioned structure, since the inner lid 16 serving as a heat dissipation plate is provided with the oxide film layer 18 containing silver having an excellent antibacterial property, the cooked rice which is an object to be heated is decomposed ( Deterioration) can be suppressed. Moreover, the thermal efficiency related to heat retention can be improved.

That is, in the oxide film layer 18, silver ions act on rice through steam in the air on the cooked rice, which is the object to be heated, and can suppress spoilage of the cooked rice. In addition, it is possible to suppress the dew condensation of the steam attached during the rice cooking operation, and to prevent the dew condensation water from spoiling with time. As a result, it is possible to prevent the spoiled water from dropping and adhering on the rice. As a result, it is possible to suppress the decay of rice and the deterioration thereof such as the generation of rotten smell.

In order to confirm the effect of the structure of the present invention, the present inventor has installed an inner lid 16 provided with an oxide coating layer 18 containing silver and a conventional inner lid not provided with the oxide coating layer 18. Prepared and conducted an experiment.

In the first experiment, after two 5.5 kinds of inner lids were respectively attached to the rice cookers of the same model capable of cooking 5.5 go of cooked rice, 5.5 go (full amount) of rice was cooked. The power was shut off, the mixture was left to stand naturally, and after 85 hours, the conditions of the rice were compared. The temperature in the room where the first experiment was conducted was about 2
It is kept at 2 ℃.

As a result, in a conventional rice cooker equipped with an inner lid not provided with the oxide film layer 18, water begins to come out from the cooked rice. Here, it is considered that this water is the water in which the starch in the cooked rice is decomposed and the water in the cooked rice is exuded as the cooked rice decays. On the contrary,
The rice cooker equipped with the inner lid 16 of the present invention provided with the oxide film layer 18 does not produce water.

Regarding the yellowing, odor and rottenness associated with the oxidative deterioration of rice, the rice cooker equipped with the conventional inner lid was obviously more advanced. In other words, the rice cooker equipped with the inner lid 16 of the present invention has a slower degree of yellowing, odor and rot than the rice cooker equipped with the conventional inner lid.

Furthermore, the inventor of the present invention, as a second experiment,
Two types of inner lids are attached to the same type of rice cooker that can cook 5.5 rice cooked rice, 1500cc of water is stored in the rice cooking pot 1, and heated at 650W for 12 minutes (130Wh) and heated. Water temperature before (T0) and water temperature after heating (T1)
Was measured, and the thermal efficiency n was calculated and compared. The method of calculating the thermal efficiency n is shown below.

[0027]

[Equation 1]

As a result, in the rice cooker equipped with the conventional inner lid without the oxide film layer 18, the thermal efficiency n was 60%, whereas the inner lid 16 of the present invention with the oxide film layer 18 was provided. In the rice cooker equipped with, the thermal efficiency n was 65%. That is, the rice cooker equipped with the inner lid 16 of the present invention can achieve a 5% increase in thermal efficiency as compared with the conventional rice cooker equipped with the inner lid.

The present invention is not limited to the configuration of the above embodiment. For example, in the above-described embodiment, the oxide film layer 18 containing silver is provided on the surface of the inner lid body 17, but the metal salt used in the electrolytic solution is not limited to the silver salt, but a copper salt. Good. Further, both silver salt and copper salt may be used.

In the above embodiment, the oxide film layer 18 is used.
Although the above is provided on the inner lid 16 which functions as a heat radiating plate, an oxide film layer 18 similar to the above may be provided on the surfaces of the pressurizing mechanism 23 and the exhaust duct 11 forming the exhaust path. Even in this case, substantially the same actions and effects as described above can be obtained.
Further, when there is a path for returning the dew condensation water in the exhaust path to the rice cooking pot 1 which is the inner container, the oxide film layer 18 may be provided on the surface of the reflux path.

Here, the components of the exhaust path and the return path are made of resin. Therefore, when the oxide film layer 18 is provided on this resin molded product, the oxide film layer 18 is formed in the same manner as above after the surface of the resin is plated with aluminum by a known method.

Furthermore, in the above embodiment, the rice cooker is applied as the heating device, but the object to be heated contained in the inner container via the inner container having a closed inside, such as a soup jar, an electric pot, and a humidifier. If you want to heat
The same actions and effects as the above can be obtained, and the deterioration of the object to be heated can be prevented.

[0033]

As is apparent from the above description, in the heating device of the present invention, the air on the object to be heated in which the ions of at least one of silver and copper having excellent antibacterial properties is contained in the inner container. It acts on the object to be heated via the water vapor inside.
In addition, it is possible to prevent the dew condensation water in the heat sink or the exhaust passage from spoiling, and as a result, it is possible to prevent the spoiled water from adhering to the object to be heated. As a result, it is possible to suppress deterioration such as decay of the object to be heated.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing a rice cooker that is a heating device according to an embodiment of the present invention.

2A is a perspective view of an inner lid, and FIG. 2B is an enlarged cross-sectional view of the inner lid.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Rice cooker (inner container), 2 ... Main body, 5 ... Induction heating coil (heating means), 7 ... Lid body, 9 ... Exhaust port, 11 ... Exhaust duct (exhaust path), 14 ... Lid heater, 16 ... Inside Lid, 17 ...
Inner lid body, 18 ... Oxide film layer, 23 ... Pressurizing mechanism, 24 ...
Drive mechanism.

Claims (2)

[Claims] 1. A lid for closing an opening of an equipment body, an inner container arranged inside the equipment body, a heating means for heating the inner container, and a heat radiating plate arranged above the inner container. When,
In a heating device having an exhaust path for discharging vapor generated in the inner container, the heat dissipation plate, or at least a part of the surface of the exhaust path, containing at least one of silver and copper. A heating device provided with an oxide film layer. 2. The lid is removably attached to an upper part of the device body, and the heat dissipation plate is an inner lid detachably attached to the lid. The heating device described in.