JP2518542B2 - Induction heating rice 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 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, in an induction heating cooker proposed in Japanese Utility Model Publication No. 61-31507, a top plate that covers an upper portion of an induction heating coil is formed of a magnetic flux transmitting material such as a ceramic that can transmit the magnetic flux of the induction heating coil. And have a cooking surface. 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 in the bottom portion of a container formed by an outer case and an inner container, and an alternating coil is provided in the inner container of the container. A rice cooker that heats up by a magnetic field is accommodated to face the induction heating coil through an inner container, and the rice cooker is supported inside the cooker by placing the upper edge portion of this cooker on the shoulder of the cooker. 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. It is characterized in that it is made higher than the inner bottom surface of the inner container in a state of being exposed to the space and in contact with the supported rice cooker.

[0009]

In the above-mentioned structure of the present invention, the upper end peripheral portion 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. In addition, since this does not require special consideration regarding impact resistance of the inner container, simplification of the configuration can be achieved.
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 to each other, it is possible to improve safety in use and prolong product life. Moreover, since the temperature detector faces the inside of the space from the inner container and is higher than the inner bottom surface of the inner container in the state of contacting with the supported rice cooker, the inner container forms a space with the rice cooker. Therefore, it is possible to avoid detection failure due to the large distance between the bottom parts, and on the contrary, it is less affected by the outside air blown from the cooling fan installed inside the body, so it is more appropriate than the conventional one. In addition, the temperature of the rice cooker can be detected, and the control of the heat retention step as well as the control of the rice cooking step can be achieved more appropriately 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.

A temperature detector 9 holding a temperature sensor 9a such as a thermistor for detecting the temperature of the rice cooker 1 is provided at the center of the support board 7 while being constantly urged 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.
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
By arranging each of the electric circuit portions 11 in the bottom 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 is open at the top and encloses the rice cooker 1 from below, and has an opening at the upper end. 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 the rice cooker 1 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 peripheral portion and the bottom of the rice cooker 1 and the inner container 2, and the temperature detecting body 9 is exposed from the inner container 2 into the space 21. It is designed to be higher than the inner bottom surface of the inner container 2 while being in contact with the supported 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 for closing the rice cooker 1 is provided on the lower surface side of the lid 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. Since the rice cooker 1 is placed on the upper end opening edge 13 of the inner container 2 forming 100 and is supported in the container 4, the rice cooker 1 is kept at a necessary distance from the inner container 2 made of the magnetic field ray permeable material. Even if the magnetic field line transmitting material is a material such as ceramic or resin having low strength, which is weak against shock, the shock accompanying the storage of the rice cooker 1 can be alleviated.

[0028] Further, since no special consideration is given to the impact resistance of the inner container 2, it is possible to simplify the structure. 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 of the inner container 2 and is higher than the inner bottom surface of the inner container 2 in a state of contacting with the supported rice container 1, the rice container 1 and the inner container 1 2 can form a space 21 and the detection failure due to the bottoms being separated from each other can be avoided, and conversely, the influence of the outside air blown from the cooling fan 12 provided in the body 4 can be avoided. Since it is hard to receive, it is possible to detect the temperature of the rice cooker 1 more appropriately than the conventional one, and to achieve not only the control of the heat retention step but also the control of the rice cooking step more appropriately based on the above heating characteristics. You can

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. In addition, since this does not require special consideration regarding impact resistance of the inner container, simplification of the configuration can be achieved.
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 to each other, it is possible to improve safety in use and prolong product life.

Moreover, since the temperature detecting body faces the inside of the space from the inner container and is higher than the inner bottom surface of the inner container in the state of contacting with the supported rice cooker, the inner container and the rice cooker have a space. It is possible to avoid a detection failure due to the fact that the bottoms are greatly separated from each other, and on the contrary, it is less susceptible to the outside air blown from the cooling fan provided inside the body, The temperature of the rice cooker can be detected more appropriately, and the control of the heat retention process as well as the control of the rice cooking process can be achieved more appropriately 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)

(57) [Claims] 1. A bottom portion of a body formed by an outer case and an inner container.
An induction heating coil provided inside, this vessel body of the inner container housing the rice device for heating by an alternating magnetic field is opposed to the induction heating coil through the inner container, the upper periphery device body of the rice device By supporting the rice bowl on the shoulder,
In addition, 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 placed in the inner container .
From the inside to contact with the supported rice cooker.
The induction heating rice cooker is characterized in that it is higher than the inner bottom surface of the inner container in the state .