JP2800738B2 - Induction cooker - Google Patents

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 using electromagnetic induction.

[0002]

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

[0003] For example, an induction heating cooker proposed in Japanese Utility Model Publication No. 61-31507 discloses a ceramic in which the lines of magnetic force of the induction heating coil can pass between an induction heating coil and a cooking vessel generating heat by the electromagnetic induction. A top plate made of, for example, is made on the upper surface of the outer case, and the cooking container is placed on the top plate.

[0004]

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

Since the bottom of a rice cooker containing a large amount of rice and water abuts against a magnetic line-permeable material such as ceramic which is weak against impact, the magnetic line-permeable material is easily broken by an impact at the time of mounting.

[0006] Since the side peripheral surface of the riceware is exposed to the outside,
The heat of the rice cooker escapes and the heat efficiency is poor, and the bottom of the rice cooker is intensively heated so that rice cannot be cooked plumply.

[0007] In view of the above problems, the present invention can maintain a constant distance between the rice cooker and the induction heating coil without contacting the bottom of the rice cooker with the magnetic flux transmitting material, and can reduce the heat of the rice cooker. It is an object of the present invention to provide an induction heating rice cooker that is hard to escape to the outside, enhances thermal efficiency, and can cook rice completely by wrapping and heating the whole rice cooker.

[0008]

According to the present invention, an induction heating coil is provided in an outer case to achieve the above object.
A rice cooker that generates heat by the electromagnetic induction action of the induction heating coil, and an inner container that houses the rice cooker are provided, and at least the bottom of the inner container is formed as a magnetic flux transmitting material through which the magnetic flux of the induction heating coil made of heat-resistant resin passes. The induction heating coil is provided on the outer bottom, and the rice cooker is entirely made of iron or ferromagnetic type stainless steel, etc.
An outward flange formed on the opening edge of the riceware is placed on the opening edge of the inner container, and is supported so that there is a space between the outer bottom of the riceware and the inner bottom of the inner container. It is characterized by having done.

[0009]

The outward flange formed on the opening edge of the rice cooker is placed on the opening edge of the inner container of the container body, and the load of the rice cooker is dispersed and supported by the opening edge, whereby the bottom of the rice cooker is supported. Can be floated from the inner container to provide an interval, thereby avoiding a situation in which the inner container is shocked when the rice cooker is placed as in the case of directly placing a cooking container on a conventional electromagnetic induction heating cooker. be able to. In addition, at least the bottom of the inner container is made of a magnetic flux transmitting material, but by being made of heat-resistant resin,
Even if it receives unexpected external force, it is hard to be damaged because of high impact resistance. The rice cooker is entirely ferromagnetic
Heat is generated by high-frequency magnetic lines of force such as Ip stainless steel
It is made of a material , placed on the opening edge of the inner container, housed in the inner container, and does not expose to the outside like a cooking container placed on a conventional electromagnetic induction heating cooker, and the heat is Since it is difficult to escape to the inside and the heat is kept by the space formed between the inner container and the inner container, the heating efficiency can be improved, and the entire rice cooker can be wrapped and heated.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS.

The outer case 3 in which the rice cooker 1 and the inner container 2 are accommodated has a bottom member 5 and a shoulder member 6 made of synthetic resin fitted to the upper and lower peripheral edges of a metal cylinder 4 respectively. An induction heating coil 8 that generates lines of magnetic force is arranged on a support plate 7 provided below the inside of the outer case 3. A thermistor 9 for detecting the temperature of the rice cooker 1 is disposed at the center of the support plate 7 so as to be constantly urged upward by a coil spring 10. Below the induction heating coil 8, an electric circuit unit 11 (see FIG. 2) including an inverter circuit for driving the induction heating coil 8 and a control circuit for controlling the inverter circuit according to the temperature of the rice cooker 1 is provided. It is arranged. In the electric circuit section 11, when the rice cooker switch is turned on, the relay switch is turned on, and a high-frequency current flows through the induction heating coil 8. Thermistor 9 detects the temperature of bottom 17 of rice cooker 1 and
At the end of cooking rice, the relay switch is turned off. The fan 12 provided above the electric circuit section 11 is for cooling the power transistor of the inverter circuit.

The inner container 2 is made of a material such as ceramics or heat-resistant resin which can transmit magnetic lines of force. The inner container 2 is open at the upper side to house the rice cooker 1 and wrap it from below. The opening edge 13 is formed as an outward flange. Have been. This inner container 2
The upper end opening edge 13 is supported by a step portion 114 provided on the inner peripheral side of the shoulder member 6 so as to be detachably incorporated in the outer case 3. The induction heating coil 8 is provided at the outer bottom of the inner container 2, and an insertion hole 15 through which the thermistor 9 is inserted is provided at the center of the bottom 14.

The rice cooker 1 is entirely made of a material that generates heat by high-frequency lines of magnetic force, such as iron or ferromagnetic type stainless steel, has an outward flange formed at an opening edge 16, and has a bottom 17 formed in a flat plate shape. I have. And the opening edge 1
The rice cooker 1 is supported by the outer case 3 by placing the rice cooker 6 closely on the opening edge 13 of the inner container 2.

The cover 18 of the outer case 3 is
Are connected so as to be openable and closable by a hinge 19 mounted between the two. An inner lid 20 for closing the rice cooker 1 is provided on the lower surface side of the lid 18.
Are arranged.

According to the induction-heated rice cooker configured as described above, the outward flange formed at the opening edge 16 of the rice cooker 1 is placed on the opening edge 13 of the inner container 2 disposed inside the outer case 3. By doing so, the outer bottom of the rice cooker 1 can be floated from the inner bottom of the inner container 2 to provide an interval, and the rice cooker can be placed on a conventional electromagnetic induction heating cooker as in the case where the cooking container is directly placed. A situation in which an impact is sometimes applied to the inner container can be avoided. In addition, the inner container 2 is made of a magnetic flux transmitting material, but is made of a heat-resistant resin, so that even if it is subjected to an unexpected external force, the inner container 2 has high impact resistance and is hardly damaged.
Since the opening edge 13 is backed up by the shoulder member 6 of the outer case 3, even if a large amount of rice or water is contained in the rice cooker 1, the inner container 2 is not broken, and the load of the rice cooker 1 is circular. It can be sufficiently dispersed and supported in the direction. In addition, since the bottom portion 17 of the rice cooker 1 can be maintained at a fixed distance from the induction heating coil 8, a stable output can be obtained. Since the space 21 between the rice cooker 1 and the inner container 2 is a closed space, the heat of the rice cooker 1 is hard to escape to the outside, so that the heating efficiency can be improved and the rice cooker 1 can be heated so as to wrap the entire rice cooker 1 so that the rice can be cooked. We can cook plumply.

In the second embodiment of the present invention shown in FIG. 3, only the bottom portion 14 of the inner container 2 is made of ceramics, the magnetic flux of the induction heating coil 8 can be transmitted, and the side peripheral portion 22 is made of an aluminum-based material. It is what it was. The lower edge 23 of the side peripheral portion 22 is formed as an inward flange, and the peripheral edge of the bottom portion 14 is bonded and fixed with a silicon adhesive 24 having heat resistance.

As a result, a low-cost induction heating rice cooker can be obtained by reducing the amount of expensive ceramic used, and the load of the rice cooker 1 is not applied to the ceramic bottom portion 14. Aluminum-based materials generally generate little heat, and are hardly affected by the lines of magnetic force of the induction heating coil 8. In addition, as in the modification of the present embodiment shown in FIG. 4, the bottom portion 14 is made of heat-resistant resin, the lower edge portion 23 of the side peripheral portion 22 is formed as an outward flange, and a plurality of Bolt screw part 25
Are integrally formed and both are fastened and fixed by bolts 26, so that the cost can be further reduced.

In the third embodiment of the present invention shown in FIG. 5, the inner container 2 is formed of transparent ceramic glass, and an infrared temperature sensor 27 is disposed at the center of the induction heating coil 8.
Site 2 of the inner container 2 facing the infrared sensor 27
The print 28 is applied to the outer surface other than 9 to make it opaque. Other configurations of the present embodiment are the same as those of the first embodiment, and therefore are denoted by common reference numerals, and description thereof will be omitted.

According to this embodiment, the infrared temperature sensor 27
Since the temperature of the bottom 17 of the rice cooker 1 can be measured through the transparent portion 29 of the inner container 2 in a non-contact manner, the load of the rice cooker 1 is not applied to the sensor 27, so that the sensor 27 does not need to be reinforced. is there. Further, since there is no opening at the bottom 14 of the inner container 2, water in the inner container 2 does not leak, and no special waterproof device is required for the induction heating coil 8, the electric circuit portion 11, and the like.

As shown in FIG. 6, an opening 30 is provided at the center of the bottom 14 of the inner container made of ceramic or heat-resistant resin, and the opening 30 is provided with a transparent heat-resistant material. A transparent portion 29 may be formed by fixing a resin window member 31 to the bottom portion 14 with a silicone adhesive 24.

The present invention can be configured in various modes other than the above-described embodiment. For example, outer case, inner container,
The shape and material of the rice cooker, the transparent part, and the like are not limited to those described in the above embodiment, and can be freely designed as needed.

[0022]

According to the present invention, the outward flange formed on the opening edge of the rice cooker is placed on the opening edge of the inner container of the container,
By distributing and supporting the load of the rice cooker by the opening edge, the bottom of the rice cooker can be floated from the inner container to provide an interval, and the cooking container is placed directly on a conventional electromagnetic induction heating cooker. It is possible to avoid a situation in which an impact is applied to the inner container at the time of placing the riceware as in the case where the riceware is placed. Moreover, at least the bottom of the inner container is made of a magnetic flux transmitting material, but since the inner container is made of a heat-resistant resin, it has a high impact resistance even if it is subjected to an unexpected external force, so that it is hardly damaged. The rice cooker is
High frequency magnetic force such as iron or ferromagnetic stainless steel
It is made of a material that generates heat by wire, and it is placed on the opening edge of the inner container and housed in the inner container, and it is not exposed to the outside like a cooking container placed on a conventional electromagnetic induction heating cooker Since the heat is hard to escape to the outside, and the heat is kept by the space formed between the inner container and the inner container, the heating efficiency can be improved, and the entire rice cooker can be wrapped and heated.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention.

FIG. 2 is an electric circuit diagram.

FIG. 3 is an enlarged sectional view of a main part showing a second embodiment of the present invention.

FIG. 4 is an enlarged sectional view of a main part showing a modification of the second embodiment.

FIG. 5 is a sectional view of a main part showing a third embodiment of the present invention.

FIG. 6 is an enlarged sectional view of a main part showing a first modification of the third embodiment.

[Explanation of symbols]

 Reference Signs List 1 rice cooker 2 inner container 3 outer case 8 induction heating coil 13, 16 opening edge 14, 17 bottom

Claims (1)

(57) [Claims] An induction heating coil, a rice cooker that generates heat by an electromagnetic induction action of the induction heating coil, and an inner container for accommodating the rice cooker are provided in an outer case, and at least a bottom portion of the inner container is made of heat-resistant resin. The induction heating coil is provided at the outer bottom as a magnetic flux transmitting material through which the magnetic flux of the induction heating coil passes, and the rice cooker is made of a material which is entirely heated by high frequency magnetic flux such as iron or ferromagnetic stainless steel .
The outer flange formed on the opening edge of the riceware is placed on the opening edge of the inner container, and is supported so that there is a space between the outer bottom of the riceware and the inner bottom of the inner container. An induction heating rice cooker characterized by the following.