JPH07276A - Induction heating rice cooker - Google Patents

Abstract

(57) [Abstract] [Purpose] A rice cooker can cook rice by forming a space between the rice cooker and the magnetic field line permeable material to maintain the required distance from the heating coil and to even out the temperature distribution in the space. Yes, and ensure the safety of use and products. [Construction] An induction heating coil 8 is provided at the bottom of the body 4, the inner container 2 of the body 4 is integrally molded with a magnetic field ray permeable material, and the rice container 1 that generates heat by an alternating magnetic field is housed in the inner container 2. The rice cooker 1 is made to face the induction heating coil 8 and the upper edge 1
6 parts are hung on the shoulder 100 of the body 1 and supported inside the body 4 to form a space 21 between the side peripheral portion and the bottom portion of the rice cooker 1 and the inner container 2, The temperature detecting body 9 holding the temperature sensor 9a is made to face the space 21 and is brought into pressure contact with the rice cooker 1.

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.

In the induction heating cooker proposed in Japanese Utility Model Publication No. 61-31507, for example, the top plate covering the induction heating coil is formed by a magnetic field line transmitting material such as ceramic that allows the magnetic field lines of the induction heating coil to pass therethrough. However, it is a cooking aspect. Therefore, the cooking container that generates heat by the electromagnetic induction action of the induction heating coil is designed to be placed on the top plate made of the magnetic field line transmitting material for cooking.

[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 the rice cooker containing a large amount of rice and water abuts against the magnetic field line transmitting material such as ceramic, which is weak against impact, the magnetic field line transmitting material is easily broken by the impact during mounting.

[0006] Since the side peripheral surface of the rice cooker 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 to become local heating, so that the rice cannot be heated uniformly and sufficiently from the entire circumference, and the rice cannot be cooked fluffy.

In view of the above problems, the present invention can maintain the necessary distance between the rice cooker and the induction heating coil without bringing the bottom of the rice cooker into contact with the magnetic field line permeable material, and heat the rice cooker to the outside. The purpose of the present invention is to provide an induction heating rice cooker that can be cooked in a fluffy manner by wrapping the entire rice cooker in the presence of space and heating it efficiently and evenly from the surroundings. To do.

[0008]

In order to achieve the above-mentioned object, the present invention has an induction heating coil at the bottom of the container formed by the outer case and the inner container, and the inner container of this container is made of a magnetic field line permeable material. In addition, the rice cooker that heats up due to the alternating magnetic field is housed in the inner container, and is opposed to the induction heating coil through the inner container, and the upper edge of the rice cooker is placed on the shoulder of the container. By supporting the rice cooker inside the container, this support forms a space between the side and bottom of the rice cooker and the inner container, and the temperature sensor holds the temperature sensor at the bottom of the container. A body is provided so that the temperature detecting body faces the space from the inner container and is brought into contact with the supported rice cooker.

[0009]

According to the above-mentioned structure of the present invention, since the upper end peripheral portion of the rice cooker is placed on the shoulder portion of the container body formed by the outer case and the inner container and supported inside the container, the rice cooker transmits magnetic field lines. By keeping a necessary distance from the inner container made of the material, even when the magnetic field line permeable material is a material such as a ceramic which is weak against impact or a resin whose strength is weak, the impact due to the storage of the rice cooker can be mitigated. Coupled with this, the inner container of the body was integrally molded with the magnetic field line transparent material, so that the rice cooker keeps the necessary distance by the alternating magnetic field from the induction heating coil through the inner container made of the magnetic field line transparent material, and is properly heated. Therefore, it is possible to further simplify the structure of the inner container. Further, since the space is formed between the inner container of the bowl and the side and bottom portions of the rice cooker, the heat from the rice cooker generated by the alternating magnetic field is spilled into the space from the bottom to the side circumference of the rice cooker. While making the temperature distribution in this space uniform, the rice can be cooked softly, and even if the inner container is made of a resin magnetic field line-transmitting material due to the existence of the space, it will generate heat in the rice cooker. By solving the problem of melting too close together, it is possible to improve safety in use and prolong product life. Moreover, since the temperature detector faces the space from the inner container and contacts the rice cooker, even if the inner container and the rice cooker form a space, the cooking temperature in the rice cooker is accurately detected, Not only the control of the heat retention step but also the control of the rice cooking step can be appropriately achieved based on the heating characteristics.

[0010]

EXAMPLE An induction heating rice cooker as an example shown in FIGS. 1 and 2 of the present invention will be described.

In the rice cooker of this embodiment, as shown in FIG. 1, an outer case 3 in which a rice cooker 1 and an inner container 2 are housed is provided with a synthetic resin bottom portion at the upper and lower peripheral edges of a metal tubular body 4. The material 5 and the shoulder member 6 are fitted into each other, and the outer case 3 and the inner container 2 form a body 4.

An induction heating coil 8 for generating magnetic lines of force is provided on a support board 7 provided below the inside of the outer case 3, that is, in the bottom of the body 4.

At the center of the support board 7, a temperature detector 9 holding a temperature sensor 9a such as a thermistor for detecting the temperature of the rice cooker 1 is provided by a coil spring 10 which is always biased upward.

Below the induction heating coil 8, an inverter circuit for driving the induction heating coil 8 as shown in FIG.
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.

These induction heating coil 8 and temperature detector 9
Since each of the electric circuit portion 11 and the electric circuit portion 11 is located inside the bottom portion of the body 4, the mutual connection structure is simplified.

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 thermistor 9a detects the cooking temperature or the heat retention temperature during rice cooking or heat retention through the bottom portion 17 of the rice cooker 1,
When the cooking temperature reaches the rice cooking end temperature, the reed switch is turned off.

The electric circuit portion 11 is provided together with the fan 12 in the heat shield cover 41 on the bottom member 5.
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 of the container body 4 is integrally formed 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 that opens upward and wraps the rice cooker 1 from below. 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.

In the center of the bottom plate portion 14 of the inner container 2, an insertion hole 15 for inserting the temperature detecting body 9 is provided.

The rice cooker 1 is made of a material such as iron or ferromagnetic type stainless steel that generates heat by an alternating magnetic field. The upper edge 16 is formed as an outward flange, and the bottom 17 is formed in a flat plate shape. Is housed in the inner container 2 and is opposed to the induction heating coil 8.

The upper end peripheral portion 16 of the rice cooker 1 forms a shoulder portion 100 of the container body 4 formed by the outer case 3 and the inner container 2. The rice cooker 1 is supported on the upper end opening edge 13 of the inner container 2 forming the shoulder portion 100 of the container 4 by being placed on the upper end opening edge 13 of the inner container 2. However, the supporting of the rice cooker 1 is not limited to this, and as long as it is placed 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. You can

By this support, a space 21 is formed between the side and bottom portions of the rice cooker 1 and the inner container 2, and the temperature detecting body 9 is supported from the inner container 2 into the space 21. It contacts the rice cooker 1.

The lid 18 of the outer case 3 is formed by the shoulder member 6 described above.
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 peripheral edge 16 of the rice cooker 1 is formed into the shoulder 100 of the body 4 formed by the outer case 3 and the inner container 2, that is, the shoulder in this embodiment. By placing the rice cooker 1 on the upper opening edge 13 of the inner container 2 forming 100 and supporting it in the container body 4, it is possible to keep the rice container 1 at a necessary distance from the inner container 2 made of the magnetic field line transmitting material. Even if the magnetic field line transmitting material is a material such as a ceramic that is weak against impact or a resin that is weak in strength, the impact due to the storage of the rice cooker 1 can be mitigated.

In combination with this, the inner container 2 of the container 4 is integrally formed of a magnetic field line permeable material, so that the rice cooker 1 is required to have a required distance by the alternating magnetic field from the induction heating coil through the inner container 2 made of this magnetic field line transparent material. Therefore, the heat is appropriately generated, and the configuration of the inner container 2 can be simplified. Further, since the space 21 is formed between the inner container 2 of the bowl body 4 and the side peripheral portion and the bottom portion of the rice cooker 1, heat from the rice cooker 1 generated by the alternating magnetic field is transferred from the bottom of the rice cooker 1 to the side. The rice can be cooked by making the temperature distribution in the space 21 uniform while making it into the space of the peripheral portion, and even when the inner container 2 is a magnetic field line transparent material made of resin due to the existence of the space, It is possible to solve the problem that the rice cooker 1 that generates heat is too close to be melted, so that safety in use and a long product life can be achieved. Moreover, since the temperature detector 9 faces the space 21 from the inner container 2 and contacts the rice cooker 1,
Even if the rice cooker 1 and the inner container 2 form a space 21,
By accurately detecting the cooking temperature in the rice cooker 1, not only the control of the heat retention step but also the control of the rice cooking step can be appropriately achieved based on the heating characteristics.

In the above specific structure of the present embodiment, since the upper end opening edge 13 is backed up by the shoulder member 6 of the outer case 3, even if the rice cooker 1 contains a large amount of rice or water. The inner container 2 is not cracked or damaged, and the load of the rice cooker 1 can be dispersed in an annular shape and sufficiently supported.

[0030]

According to the present invention, the upper edge of the rice cooker is
Place it on the shoulder of the body formed by the outer case and the inner container,
Since the rice cooker is supported inside the container, it is necessary to keep the rice cooker at a necessary distance from the inner container made of magnetic field line permeable material. The impact associated with storage can be mitigated. Coupled with this, the inner container of the body was integrally molded with the magnetic field line transparent material, so that the rice cooker keeps the necessary distance by the alternating magnetic field from the induction heating coil through the inner container made of the magnetic field line transparent material, and is properly heated. Therefore, it is possible to further simplify the structure of the inner container. Also,
Since a space is formed between the inner container of the bowl and the side and bottom portions of the rice cooker, the heat from the cooker generated by the alternating magnetic field is stored in the space from the bottom to the side circumference of the cooker. The temperature distribution in this space can be made even and the rice can be boiled up perfectly, and even if the inner container is made of resin, the magnetic field line permeable material makes it too close to a rice cooker. To solve the problem of melting
It can be used safely and have a long product life.

Moreover, since the temperature detector faces the space from the inner container and contacts the rice cooker, the cooking temperature in the rice cooker can be accurately detected even if the inner container and the rice cooker form a space. Then, not only the control of the heat retention step but also the control of the rice cooking step can be appropriately achieved based on the heating characteristics.

[Brief description of drawings]

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

FIG. 2 is an electric circuit diagram of the embodiment shown in FIG.

[Explanation of symbols]

 1 Rice Cooker 2 Inner Container 3 Outer Case 4 Body 8 Induction Heating Coil 9 Temperature Detector 9a Thermistor 13 Top Opening Edge 16 Top Edge 100 Shoulder

Claims (1)

[Claims] 1. An induction heating coil is provided at the bottom of a container formed by an outer case and an inner container, the inner container of the container is integrally molded with a magnetic field line transmitting material, and heat is generated in the inner container by an alternating magnetic field. The rice cooker is accommodated to face the induction heating coil through an inner container, and the rice cooker is supported in the body by placing the upper end peripheral portion of the rice cooker on the shoulder of the body.
And by this support, a space is formed between the side peripheral portion and the bottom of the rice cooker and the inner container, and the temperature detector holding the temperature sensor is provided at the bottom of the container, and this temperature detector is removed from the inner container. An induction heating rice cooker, characterized in that it faces the inside of the space and abuts against the supported rice cooker.