JPH0810136A - Rice-cooker - Google Patents

Abstract

PURPOSE:To provide a rice-cooker wherein magnetic flux is not leaked even if a magnetoproofing plate is omitted by forming an outer frame wherein the magnetic flux from an induction coil is not leaked to the outside of a main body. CONSTITUTION:This rice-cooker is provided with a rice-cooker main body, a lid body 9 covering the opening part of the main body 1 and being opened and closed by a hinge mechanism 1 as a support, an inner pot 2 stored freely removably in a main body 1, an induction coil 4 for heating the inner pot 2 by means of electromagnetic induction action and an outer frame 8 covering the inner pot 2 and the induction coil and forming the main body. In addition, the outer frame 8 is divided into two parts at least at the height of the upper end of the induction coil 4 and the upper part of the outer frame 11A is formed of a metal and the lower part 11B of the outer frame facing to the induction coil 4 is formed of a non-magnetic metal. The magnetic flux generated from the induction coil is reflected like this by the lower part of the outer frame of the nonmagnetic metal and the leakage of the magnetic flux to the outside of the main body is prevented from occurring. It is possible thereby to omit a magnetoproof plate and it becomes unnecessary to enlarge the outer shape as the number of parts can be decreased.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art FIG. 4 shows, for example, Japanese Patent Laid-Open No. 4-325120.
It is a side sectional view which shows the conventional rice cooker shown by the gazette. In the figure, 1 is the body of the rice cooker, 2 is the inner pot to be housed in the outer pot 3, and 4 is an induction coil, which is arranged on the bottom of the outer pot 3. Reference numeral 5 denotes a temperature detection unit incorporating a thermistor or the like, which is brought into close contact with the bottom of the inner pot 2 by a spring 6 to detect the temperature of the inner pot 2. Reference numeral 7 denotes a metal magnetic shield plate which is integrated with a plastic outer frame 8 and is provided outside the induction coil 4 so as to surround the outer pot 3. Reference numeral 9 is a lid that covers the upper opening of the main body 1, and 10 is a hinge mechanism that connects the main body 1 and the lid 9.

In the conventional rice cooker having the above-mentioned structure, the polished rice and water corresponding to the amount of rice are put in the inner pot 2, the inner pot 2 is set in the outer pot 3, and the hinge mechanism 10 is used. Close the lid 9 with the fulcrum as the fulcrum and press the rice cooking button (not shown). Then, the induction coil 4 is energized, and the inner pot 2 is heated by the electromagnetic induction action to cook rice. Then, the temperature of rice cooking completion is sensed by the thermistor incorporated in the temperature detection unit 5, and the temperature is kept.

[0004]

In the conventional rice cooker as described above, when the induction coil 4 is energized,
A magnetic field is generated in the main body 1. Since the outer frame 8 is made of plastic, the generated magnetic flux may leak to the outside of the main body 1. Therefore, the magnetic flux leakage is prevented by providing the magnetic shield 7 on the outer circumference of the induction coil 4 and integrating it with the outer frame 8. However, there was a problem that the number of parts increased and the outer shape of the outer frame also increased.

The present invention has been made to solve the above problems, and an object thereof is to obtain a rice cooker which does not leak magnetic flux to the outside of the main body without a magnetic shield.

[0006]

In the rice cooker according to the present invention, an inner pot removably housed in the main body, an induction coil for heating the inner pot by electromagnetic induction, and an inner pot and an induction coil are provided. An outer frame which covers and forms the main body, the outer frame is divided into two parts at a height of at least an upper end of the induction coil, and a lower part of the outer frame facing the induction coil is formed of a non-magnetic metal body. is there.

[0007] Further, it is provided with an inner pot removably housed in the main body, an induction coil for heating the inner pot by an electromagnetic induction action, and an outer frame for covering the inner pot and the induction coil and forming the main body. The outer frame is made of a synthetic resin mixed with a magnetic absorbing material.

Further, it is provided with an inner pot which is removably housed in the main body, an induction coil which heats the inner pot by an electromagnetic induction action, and an outer frame which covers the inner pot and the induction coil and forms the main body. The outer frame is divided into two parts at the height of at least the upper end of the induction coil, and the lower part of the outer frame facing the induction coil is formed of a synthetic resin mixed with a magnetic absorbing material.

[0009]

In the rice cooker configured as described above, the lower part of the outer frame which is divided into two parts at the height of at least the upper end of the induction coil and which is formed of a non-magnetic metal body facing the induction coil is connected to the induction coil. It reflects the magnetic flux generated when electricity is applied and prevents the magnetic flux from leaking out of the body.

Further, the outer frame formed from the synthetic resin mixed with the magnetic absorbing material reflects the magnetic flux generated when the induction coil is energized and prevents the magnetic flux from leaking to the outside of the main body.

Further, the lower part of the outer frame, which is divided into two parts at the height of at least the upper end of the induction coil and is formed of a synthetic resin mixed with a magnetic absorbing material, which opposes the induction coil, is a magnetic flux generated when the induction coil is energized. To prevent magnetic flux from leaking outside the body.

[0012]

EXAMPLES Example 1. FIG. 1 is a side sectional view showing a rice cooker according to an embodiment of the present invention. In the figure, 1 to 6, 8 to 10 are the same as those of the above-mentioned conventional art, and the description thereof will be omitted. The outer frame 8 is divided into two parts 11A and 11B. 11A is an upper part of the outer frame made of a non-metal body, and 11B is a lower part of the outer frame made of a non-magnetic metal body (aluminum or the like). Reference numeral 12 denotes a fitting portion between the outer frame upper portion 11A and the outer frame lower portion 11B, which fits at the height of at least the upper end of the induction coil 4.

In the rice cooker thus constructed,
The rice cooking operation is similar to that of the conventional technique, and the description thereof is omitted. Then, the magnetic flux generated by energizing the induction coil 4 tries to leak to the outside of the main body 1, but is divided into two at the height of at least the upper end of the induction coil 4, and the outer frame upper portion 11A is made of a non-metal body, the induction coil 4 The lower portion 11B of the outer frame opposed to is made of a non-magnetic metal body to reflect the magnetic flux and to shield the outside of the main body.

Example 2. Second Embodiment FIG. 2 is a side sectional view of a rice cooker showing a second embodiment of the present invention.
10 to 10 are the same as those of the above-mentioned conventional technique, and the description thereof will be omitted. Reference numeral 13 is an outer frame formed of a synthetic resin mixed with a magnetic absorber.

In the rice cooker thus constructed,
The rice cooking operation is similar to that of the conventional technique, and the description thereof is omitted. Then, the magnetic flux generated by energizing the induction coil 4 tries to leak to the outside of the main body 1, but the magnetic flux is reflected by the outer frame 13 formed of the synthetic resin mixed with the magnetic absorbing material, and the magnetic flux is transmitted to the outside of the main body. Protect against magnetic fields.

Embodiment 3. Third Embodiment FIG. 3 is a side sectional view of a rice cooker showing a third embodiment of the present invention.
Reference numeral 10 is the same as that in the first embodiment, and the description thereof is omitted. The outer frame 8 is divided into 14A and 14B, where 14A is an upper part of the outer frame formed of a non-metallic material such as synthetic resin, and 14B is a lower part of the outer frame formed of a synthetic resin mixed with a magnetic absorbing material. Reference numeral 15 denotes a fitting portion between the outer frame upper portion 14A and the outer frame lower portion 14B, which fits at the height of at least the upper end of the induction coil 4.

In the rice cooker thus constructed,
The rice cooking operation is similar to that of the conventional technique, and the description thereof is omitted. Then, the magnetic flux generated by energizing the induction coil 4 tries to leak to the outside of the main body 1, but it is divided into two at the height of at least the upper end of the induction coil 4, and the outer frame upper portion 14A is made of a non-metal body, the induction coil 4 By forming the outer frame lower portion 14B opposed to the above from the synthetic resin in which the magnetic absorbing material is synthesized, the magnetic flux is reflected and the outside of the main body is magnetically shielded.

[0018]

Since the present invention is configured as described above, the magnetic flux from the induction coil is reflected by the non-magnetic metal body under the outer frame facing the induction coil of the outer frame divided into two. Since the magnetic flux leakage to the outside of the main body can be prevented, the magnetic shield can be omitted, the number of parts can be reduced, and it is not necessary to enlarge the outer shape, and a rice cooker more compact than the conventional one can be formed.

Further, since the outer frame formed of the synthetic resin mixed with the magnetic absorber can reflect the magnetic flux from the induction coil and prevent the magnetic flux from leaking to the outside of the main body, the magnetic shield plate can be omitted. In addition, the number of parts is reduced, and there is no need to increase the outer shape, and a rice cooker that is more compact than before can be formed.

Further, since the lower portion of the outer frame facing the induction coil of the outer frame divided into two is formed of a synthetic resin mixed with a magnetic absorbing material, the magnetic flux from the induction coil is reflected,
Since it is possible to prevent leakage of magnetic flux to the outside of the main body, it is possible to omit the magnetic shield plate, reduce the number of parts, and eliminate the need for enlarging the outer shape.

[Brief description of drawings]

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

FIG. 2 is a side sectional view showing a rice cooker according to a second embodiment of the present invention.

FIG. 3 is a side sectional view showing a rice cooker according to a third embodiment of the present invention.

FIG. 4 is a side sectional view showing a conventional rice cooker.

[Explanation of symbols]

 1 Main Body 2 Inner Cooker 4 Induction Coil 5 Temperature Detector 9 Lid 10 Hinge Mechanism 11A Outer Frame Top (Non-Metal) 11B Outer Frame Bottom (Non-Magnetic Metal) 12 Fitting 13 Synthetic Resin Outer Frame 14A Outer Frame Top (Non-metal body) 14B Lower part of outer frame (mixed with magnetic absorbing material) 15 Fitting part

Claims (3)

[Claims] 1. A main body of a rice cooker, a lid that covers the opening of the main body and opens and closes with a hinge mechanism as a fulcrum, an inner pot removably accommodated in the main body, and the inner pot is heated by electromagnetic induction. In an rice cooker comprising: an induction coil, and an outer frame that covers the inner coil and the induction coil and forms the main body, the outer frame is divided into two at the height of at least the upper end of the induction coil, A rice cooker characterized in that an upper part is made of a non-metallic body and a lower part of an outer frame facing the induction coil is made of a non-magnetic metallic body. 2. A main body of a rice cooker, a lid which covers the opening of the main body and opens and closes around a hinge mechanism as a fulcrum, an inner pot removably housed in the main body, and the inner pot heated by electromagnetic induction. In an rice cooker including an induction coil for controlling the inner coil and an outer frame that covers the induction coil and forms the main body, the outer frame is formed of a synthetic resin mixed with a magnetic absorber. Rice cooker. 3. A rice cooker main body, a lid that covers the main body opening and opens and closes with a hinge mechanism as a fulcrum, an inner pot removably housed in the main unit, and the inner pot heated by electromagnetic induction. In an rice cooker comprising: an induction coil, and an outer frame that covers the inner coil and the induction coil and forms the main body, the outer frame is divided into two at the height of at least the upper end of the induction coil, A rice cooker characterized in that the upper part is made of a non-metallic body and the lower part of the outer frame facing the induction coil is made of a synthetic resin mixed with a magnetic absorbing material.