JP2000005051A - Induction heating type rice cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To appropriately block the leakage of a magnetic flux while suppressing a ferrite amount used in compact constitution. SOLUTION: The side wall of a rice cooker main body 1 is positioned near a protective frame 6. Main ferrite 16 is disposed respectively in the remaining space of two parts and the other remaining part from the center of the protective frame 6 to an oblique front part or rear part. The auxiliary ferrite 17 of a short dimension is disposed at the position of a widest interval among the main ferrite 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art In general, an induction heating type rice cooker is configured such that an inner pan housed in a storage room including a protection frame and an inner body in a rice cooker body is induction heated by an induction heating coil provided in the protection frame. It has become. In such an induction heating type rice cooker, in order to prevent magnetic flux from leaking to the surroundings by energizing the induction heating coil, a reflector is provided around the protection frame and a plurality of reflectors are provided on the bottom surface of the protection frame. Ferrite is provided.

[0003]

However, when a reflector is provided around the protective frame, a space for disposing the reflector and a structure for mounting the reflector are required, which leads to an increase in the size of the rice cooker.

[0004] On the other hand, there is a method of increasing the number of ferrites. However, since the ferrites are expensive, it is desired to adopt a configuration in which the use of ferrites is suppressed even a little.

Accordingly, an object of the present invention is to provide a compact induction heating rice cooker capable of appropriately preventing magnetic flux leakage while suppressing the amount of ferrite used.

[0006]

According to the present invention, as a means for solving the above-mentioned problems, an inner pot accommodated in an accommodation room comprising a protective frame and an inner body in a rice cooker main body is provided on the protective frame. In the induction heating type rice cooker in which the induction heating is performed by the induction heating coil, the side wall of the rice cooker main body is positioned near the protection frame, and at the same time, two places either obliquely forward or rearward from the bottom center of the protection frame. The main ferrite is disposed over the remaining one remaining space, and a short auxiliary ferrite is disposed at the position where the interval is widest among the main ferrites.

[0007] With this configuration, the non-uniform magnetic field leaking to the surroundings due to the three main ferrites disposed using the surplus space can be uniformly corrected by the auxiliary ferrite.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIGS. 1 and 2 show an induction heating type rice cooker according to this embodiment. In this induction heating type rice cooker, a lid 2 is rotatably attached to a rice cooker main body 1. The rice cooker main body 1 includes a body portion 3 and a bottom portion 4, and a housing chamber 7 is formed inside the rice cooker body 1 by an inner body 5 and a protection frame 6.
An inner pot 8 is accommodated in the accommodation room 7 so as to be able to be taken out.
The inner pot 8 can be induction-heated by an induction heating coil 9 held in a protective frame 6. The protection frame 6 is supported by a cylindrical boss 11 erected from the bottom 4 on a support base 10 formed at four locations on the outer periphery, and is screwed from a lower surface side.

The rice cooker main body 1 is formed so that its side wall is located near the protective frame 6, and the compactness in the width direction is achieved. In addition, a substrate holder 13 for holding a substrate 12 is vertically disposed in a space in front of the rice cooker main body 1. Various electric components are mounted on the substrate 12, and an electric circuit for controlling energization of the induction heating coil 9 and the like are formed. Further, a code reel 14 is disposed in a space behind the rice cooker main body 1 in a vertical direction. This allows
The rice cooker body 1 is made compact in the height direction.

On the bottom surface of the protective frame 6, the induction heating coils 9 are provided at two locations on the inner and outer circumferences, and are held by a ferrite holder 15. Ferrite holder 15
Is obtained by insert-molding two short main ferrites 16 arranged in series. Ferrite holder 15
Are disposed from the center of the bottom surface of the protective frame 6 to two extra diagonally forward spaces and one extra diagonally rear space.

In the space in front of the rice cooker main body 1, the substrate holder 13 is disposed and the support 10 of the protection frame 6 is located. The region does not interfere with the inner surface of the side wall of the portion 3. Further, in the space behind the rice cooker main body 1, since the code reel 14 is disposed, the extra space is
The portion adjacent to 0 is an area that does not interfere with the code reel 14.

As described above, in the above-described embodiment, the main ferrite 16 is attached to the ferrite holder 15 by utilizing the slightly left excess space in the rice cooker main body 1. It is impossible to place them. For this reason, in this state, the magnetic field leaking to the outside becomes uneven, and the magnetic field largely projects in the direction of the arrow in FIG. Therefore, an auxiliary ferrite holder 18 formed by insert-molding the auxiliary ferrite 17 is provided in a region between the main ferrites 16 on the side opposite to the direction in which the magnetic field protrudes. Thereby, the magnetic field leaking to the surroundings can be made uniform and equal to or less than a predetermined reference value. In addition,
The auxiliary ferrite 17 has the same shape as the main ferrite 16, so that the parts can be shared.

In the above embodiment, the two main ferrites 16 are held by the ferrite holder 15, but the main ferrite 16 may be formed as a single long one as needed. However, as in the above-described embodiment, it is preferable in terms of cost to use the same shape as the main ferrite 16 and the auxiliary ferrite to share parts.

In the above embodiment, the main ferrite 1
Although 6 is arranged at two positions obliquely forward and one position obliquely rearward, it may be arranged at one position obliquely forward and two positions obliquely rearward.

[0016]

As is apparent from the above description, according to the induction heating type rice cooker according to the present invention, the side wall of the rice cooker main body is located near the protection frame, and the main ferrite is protected from the rice cooker main body. Since it is arranged in a surplus space formed by the frame, it can be configured compact.

Further, since the short auxiliary ferrite, which is cheaper than the main ferrite, is disposed between the main ferrites having a large interval, the magnetic field leaking without providing a reflector around the reference is used. It can be suppressed below the value.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an induction heating rice cooker according to the present embodiment.

FIG. 2 is a bottom sectional view of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Rice cooker main body 6 ... Protective frame 9 ... Induction heating coil 13 ... Board holder 14 ... Cord reel 15 ... Ferrite holder 16 ... Main ferrite 17 ... Auxiliary ferrite 18 ... Auxiliary ferrite holder

 ──────────────────────────────────────────────────の Continued on the front page F term (reference) 4B055 AA03 AA09 BA01 BA35 BA63 CA09 CA16 CA17 CA68 CA71 CB27 CB30 CC61 CC70 DA01 DB14 FA02 FA03 FA16 FB18 FC06

Claims (1)

[Claims] 1. An induction heating type rice cooker for induction heating an inner pot accommodated in an accommodation room comprising a protection frame and an inner body in a rice cooker body by an induction heating coil provided in the protection frame. While the side wall of the main body is located in the vicinity of the protective frame, the main ferrite is disposed from the center of the bottom surface of the protective frame to two obliquely forward or rear portions and the remaining one remaining space, An induction-heated rice cooker, wherein a short auxiliary ferrite is disposed at the position of the main ferrite at the widest interval.