JPH07277A - Induction heating rice cooker - Google Patents

Abstract

(57) [Abstract] [Purpose] In an induction heating rice cooker, it is intended to enhance impact resistance and heat resistance of the side peripheral portion of the inner container. [Structure] An induction heating coil 8 in an outer case, and a rice cooker 1 that generates heat by an electromagnetic induction action of the induction heating coil 8.
And an inner container 2 for accommodating the rice cooker 1 are arranged.
Is a bottom portion 14 located between the induction heating coil 8 and the rice cooker.
Is formed of a magnetic field ray transmitting material, and the side peripheral portion 22 is formed of an aluminum-based metallic material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction heating rice cooker utilizing electromagnetic induction.

[0002]

2. Description of the Related Art An induction heating cooker utilizing electromagnetic induction is known to have good thermal efficiency.

For example, the induction heating cooker proposed in Japanese Utility Model Publication No. 61-31507 discloses a magnetic field line transmission material made of ceramic or resin that allows the magnetic field lines of the induction heating coil to pass through the top plate that covers the induction heating coil. It is formed by.

[0004]

However, if the above-mentioned conventional example is applied to a rice cooker as it is, the following problems occur.

If the top plate is made of a magnetic field ray transmitting material such as ceramic, which is weak against impact, there is a problem in impact resistance, and if it is made of resin or the like, heat generated from the rice cooker due to the electromagnetic induction action. There was a problem with heat resistance to prevent heat.

In view of the above problems, the present invention has an inner container in which a bottom portion located between an induction heating coil and a rice cooker is formed of a magnetic field line transmitting material, and a side peripheral portion thereof is formed of an aluminum-based metal material. In particular, it is intended to solve the problems of impact resistance and heat resistance of the side peripheral portion of the inner container.

[0007]

In order to achieve the above object, the present invention provides an induction heating coil in an outer case, and a rice cooker which generates heat by electromagnetic induction of the induction heating coil.
An inner container for accommodating the rice cooker is arranged, and the inner container is formed of a magnetic line transparent material at the bottom portion located between the induction heating coil and the rice cooker, and a side peripheral portion made of an aluminum-based metal material. It is characterized by having done.

[0008]

According to the above construction of the present invention, in particular, since the side peripheral portion of the inner container for accommodating the rice cooker is made of an aluminum-based metal material, it is more resistant to impact than magnetic field line transmitting materials such as ceramics. Strong, it is possible to strengthen impact resistance,
Further, it is possible to provide an inner container having a high degree of safety, which can be configured without causing a problem in heat resistance as compared with a magnetic field ray transmitting material such as resin.

[0009]

EXAMPLES As examples of the present invention, first and second embodiments in which the inner container in the reference example shown in FIGS. 1 and 2 is replaced with an inner container having a structure shown in FIG. 3 or 4 Is shown,
First, a reference example as shown in FIGS. 1 and 2 will be described.

This will be described. As shown in FIG. 1, an outer case 3 accommodating a rice cooker 1 and an inner container 2 has a bottom member 5 and a shoulder member 6 made of synthetic resin fitted to the upper and lower edges of a metal cylinder 4, respectively. ing.

An induction heating coil 8 for generating lines of magnetic force is provided on a support board 7 provided inside the exterior case 3.

Further, a temperature sensor 9 for detecting the temperature of the rice cooker 1 is provided at the center of the support board 7 while being constantly biased upward by a coil spring 10.

Below the induction heating coil 8, an inverter circuit for driving the induction heating coil 8, as shown in FIG. 2,
Also, an electric circuit section 11 including a control circuit for controlling the inverter circuit according to the temperature of the rice cooker 1 is provided.

In the electric circuit section 11, when the rice cooking switch is turned on, the relay switch is turned on and a high frequency current flows through the induction heating coil 8.

The temperature sensor 9 detects the temperature of the bottom portion 17 of the rice cooker 1, and the reed switch is turned off at the end of rice cooking.

The electric circuit section 11 is provided in the heat shield cover 41 on the bottom member 5 together with the fan 12.
The air is blown from above by 2 to be cooled.

The fan 12 is mainly for cooling the power transistor of the inverter circuit.

The inner container 2 is made of a magnetic field line permeable material such as ceramic or heat-resistant resin that allows magnetic field lines to pass therethrough, and has a shape in which the upper side is opened and the rice cooker 1 is wrapped from below.
The upper opening edge 13 is formed on the outward flange.

The inner container 2 is incorporated in the outer case 3 by supporting the upper end opening edge 13 on a step portion 114 provided on the inner peripheral side of the shoulder member 6. Further, the upper end opening edge 13 and the shoulder member 6 form a shoulder portion 100 of the entire body 4 formed by the inner container 2 and the outer case 3.

An insertion hole 15 for inserting the temperature sensor 9 is provided in the center of the bottom plate portion 14 of the inner container 2.

The rice cooker 1 is made of a material such as iron or ferromagnetic type stainless steel that generates heat by high-frequency magnetic force lines. The upper edge 16 is formed as an outward flange, and the bottom 17 is formed as a flat plate.

The upper edge 16 of the rice cooker 1 is placed on the upper opening edge 13 forming a part of the shoulder portion 100 of the container 4 of the inner container 2 so as to be closely attached thereto. It is supported by the inner container 2 and the outer case 3 and is supported in the container body 4 formed by the inner container 2 and the outer case 3. However, the supporting of the rice cooker 1 is not limited to this, and as long as the rice cooker 1 is hung and supported on the shoulder portion 100 of the container body 4 formed by the outer case 3 and the inner container 2, the heating structure required by the present invention is satisfied. Can

The lid 18 of the outer case 3 is formed by the shoulder member 6
And a hinge 19 attached between and so that they can be opened and closed. An inner lid 20 that closes the rice cooker 1 is disposed on the lower surface side of the lid body 18.

According to the induction heating rice cooker configured as described above, the upper edge 16 of the rice cooker 1 is formed by the upper edge 13 of the inner container 2 disposed in the outer case 3 and the like, and the shoulder portion of the body 4 is formed. 10
It can be set to 0.

Since the upper end opening edge 13 is backed up by the shoulder member 6 of the outer case 3, the inner container 2 will not be cracked or damaged even if a large amount of rice or water is contained in the rice cooker 1. The load of the rice cooker 1 can be dispersed and supported.

Further, by doing so, the bottom portion 17 of the rice cooker 1 can be held at a required distance from the induction heating coil 8 for electromagnetic induction.

The rice cooker 1 is housed in the bowl 4 so that the body is not exposed to the outside, and the space 21 between the bowl 1 and the inner container 2 is the shoulder of the bowl 1 and the bowl 4. Since it becomes a closed space with 100, the heat of the rice cooker 1 is unlikely to escape to the outside, the heating efficiency is improved, and the rice cooker 1 can be heated so as to be wrapped around the entire rice cooker 1 and the rice can be cooked fluffy.

However, when the side peripheral portion of the inner container 2 is made of a magnetic field ray transmitting material such as ceramic as described above, there is a problem in the impact resistance of the side peripheral portion, and it is possible to withstand the impact that is received in normal handling. It is necessary to set such a thickness, and it becomes heavy and bulky, and the rice cooker becomes large and heavy, which is inconvenient to use. Further, a large amount of magnetic field ray transmitting material such as expensive ceramic is used, resulting in high cost.

Further, when the side peripheral portion of the inner container 2 is made of a magnetic line permeable material such as resin, it is necessary to use a heat-resistant material in order to prevent heat from the rice cooker 1 which is heated by an electromagnetic induction action, and the heat-resistant material is required. It is not enough to use resin material, rice cooker 1
The thermal problem due to the heat generation of is not solved.

In order to solve such a problem, the present invention further improves the inner container 2 in the following embodiments in the reference examples shown in FIGS. 1 and 2 above.

In the first embodiment of the present invention shown in FIG. 3, the inner container 2 is provided with a bottom plate 14 serving as a bottom plate portion located between the induction heating coil 8 and the rice cooker 1 corresponding to the induction heating coil. The bottom plate 14 forming this bottom is mounted by a magnetic field ray transmitting material, and the side peripheral portion 22 of the inner container 2 is formed by an aluminum-based metal material.

The lower edge portion 23 of the side peripheral portion 22 is formed as an inward flange, and the peripheral edge of the bottom plate 14 is attached by a silicone adhesive 24 having heat resistance.

As a result, the amount of expensive ceramic used can be reduced to obtain a low-cost, lightweight, small-sized induction heating rice cooker, and the load of the rice cooker 1 is not applied to the weak bottom plate 14 made of ceramic or the like. .

Further, the aluminum-based metal material usually hardly generates heat, and the influence of the magnetic lines of force of the induction heating coil 8 is small.

Further, the bottom plate 14 of the inner container 2 has a simple mounting structure which is received from below by an inward flange formed by the lower edge portion 23 of the side peripheral portion 22 of the inner container 2 and adhered with a heat resistant adhesive. Alternatively, the side peripheral portion may be attached by caulking or screwing.

FIG. 4 shows a second embodiment of the present invention, in which the bottom plate 14 of the inner container 2 is formed of a magnetic field line transmitting material made of transparent ceramic glass. In this case, as a reference example, the infrared temperature sensor 2 is provided at the center of the induction heating coil 8.
7 is arranged, and the outer surface of the bottom plate of the inner container 2 other than the portion 29 facing the infrared temperature sensor 27 is printed 28 to make it opaque.

As a result, the infrared temperature sensor 27 does not contact the temperature of the bottom plate portion 17 of the rice cooker 1 and the transparent portion 29 of the inner container 2.
Since the sensor 27 is not subject to the load of the rice cooker 1, it is not necessary to reinforce the sensor 27.

Further, since the bottom plate 14 of the inner container 2 has no opening, water in the inner container 2 does not leak, and a special waterproof device such as the induction heating coil 8 and the electric circuit portion 11 is unnecessary.

[0039]

According to the present invention, in particular, the side peripheral portion of the inner container in which the rice cooker is housed is formed of an aluminum-based metal material, so that it is more resistant to impact than magnetic field line transmitting materials such as ceramics. Further, it is possible to provide an inner container having high safety, which can enhance impact resistance and can be configured without causing a heat resistance problem as compared with a magnetic field line transmitting material such as resin.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a reference example of the present invention.

FIG. 2 is an electric circuit diagram of the reference example of FIG.

FIG. 3 is a cross-sectional view of a main part showing a first embodiment of the present invention.

FIG. 4 is a sectional view of an essential part showing a second embodiment of the present invention.

[Explanation of symbols]

 1 Rice Cooker 2 Inner Container 3 Exterior Case 4 Body 8 Induction Heating Coil 14 Bottom Plate 22 Side Periphery

Claims (1)

[Claims] 1. An induction heating coil, an rice cooker that generates heat due to electromagnetic induction of the induction heating coil, and an inner container that houses the rice cooker are arranged in an outer case, and the inner container is the induction heating coil. An induction heating rice cooker, characterized in that the bottom portion located between the rice cooker and the rice cooker is formed of a magnetic field line transparent material, and the side periphery thereof is formed of an aluminum-based metal material.