JP2929373B2 - 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 a rice cooker in which the configuration of an induction heating coil of a rice cooker for cooking rice by an electromagnetic induction heating system is improved.

[0002]

2. Description of the Related Art In order to cook delicious rice, a strong heat is required, and as a method of efficiently heating with large power, an invention has been devised in which an inner pot is heated by electromagnetic induction. Japanese Patent Publication No. 63-50831 and Japanese Patent Laid-Open No. 27658/1988 discloses a configuration for holding an induction heating coil related to the present invention.
No. 3, Japanese Unexamined Patent Publication No. 4-67823,
No. 47594 and the like. All of these configurations are such that an induction heating coil formed by forming an electric wire into a coil shape is held at the bottom of the protective frame. For example, as shown in Japanese Patent Application Laid-Open No. 4-67823, an inner pot for detachably housed in a rice cooker main body and a protection frame for housing the inner pot are provided, and the protection frame is made of a non-magnetic material. There is a rice cooker having an induction heating coil disposed at the bottom of the protective frame.

[0003]

In the above prior art,
First, it is necessary to form the wire into a coil. Generally, in this manufacturing method, an electric wire is wound around a reel-shaped winding jig, and the wound electric wires are separated from each other and bonded so that the coil shape is not broken. For bonding, apply an adhesive and heat it in a furnace for several hours to cure it, or apply a resin to the wire itself and apply a large current to heat the wire and melt the resin,
A method of cooling and curing for several hours is generally used. After the bonding is completed, the jig is disassembled and the formed induction heating coil is taken out.

[0004] In the above prior art, the electric wire as a material is inexpensive, but it takes a very long time and effort in the coil forming process as described above, and it becomes a very expensive component.
Since the electromagnetic induction heating type rice cooker can efficiently transmit a large amount of electric power to the inner pot, there is a problem that the rice cannot be provided to consumers at a low price, although it has an advantage of being able to provide very delicious rice.

Further, since the induction heating coil formed once is assembled to the main body, the coil shape may be deformed during the transportation and storage of the induction heating coil until the main body is assembled, and stable heating performance may not be obtained. There was also a problem.

The above problem is caused by the fact that at least a part of the coil is adjusted to the shape of an inner pot, as disclosed in Japanese Patent Application Laid-Open No. 1-267683, compared with the case where the coil has a planar shape as disclosed in JP-B-63-50831. This has been a more prominent problem when it is arranged along the bowl at the position of the bowl-shaped curved surface.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has an inner pot detachably housed in a rice cooker main body, and a protection frame for accommodating the inner pot is provided in the main body. In the rice cooker provided with an induction heating coil at the bottom of the protective frame, the protective frame has a bottom formed in a bottomed cylindrical shape made of a non-magnetic material, and a portion rising from the bottom of the bottomed cylindrical shape to a side surface. It is formed on a curved surface, and a rib-shaped electric wire winding core along the circumferential direction of the protective frame and a winding start take-out portion without ribs are formed on this curved surface or a portion close to the curved surface, and winding is performed from the bottom of the protective frame. The induction heating coil was formed by aligning the electric wire with the take-out start portion and winding and forming the electric wire in a coil shape on the electric wire winding core.

[0008]

According to the structure of the present invention, if the electric wire is wound around the core of the electric wire winding core having the function of the winding jig with the bottom portion of the protective frame facing upward, the bowl-shaped curved surface portion can also be cut. The electric wire is wound up in the manner of a bobbin and formed into a coil shape, so that an induction heating coil can be easily formed directly without a winding jig. Further, at the time of winding the electric wire, the electric wire is aligned with the take-out portion at the start of winding to prevent a deviation at the start of winding of the electric wire, so that the electric wire can be reliably and easily wound. Further, since the coil is formed on the curved surface portion with the electric wire winding core at the core, the shape can be maintained without bonding the coil portion. Furthermore, since the electric wire is fixed in the rotation direction at the take-out portion at the start of winding, the coil does not move in the rotation direction, and can be incorporated into the main body only by covering with the coil cover.
In addition, the protective frame whose bottom is made of a non-magnetic material allows the magnetic flux generated from the induction heating coil to pass through the inner kettle, and has a high impact resistance against taking in and out of the inner kettle.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a sectional view of a rice cooker according to an embodiment of the present invention, FIG. 2 is a perspective view showing the back surface of a protection frame of the rice cooker, and FIG.
FIG. 3 is a perspective view showing a state in which an electric wire is wound on the back surface of the protection frame.

In FIG. 1, an inner pot 1 is detachably housed in a main body 2, and an inner wall of the inner pot 1, which is a storage portion of the inner pot 1, is constituted by a protective frame 3 made of a non-magnetic material. A cover 4 is attached to the main body 2 so as to be openable and closable so as to cover upper openings of the main body 2 and the inner pot 1. The protection frame 3 has a bottomed cylindrical shape, and a portion rising from the bottom surface to the side surface is formed into a curved surface and has a shape close to a bowl.

As shown in FIG. 2, an electric wire winding core 5 composed of circumferentially arranged ribs is provided in the vicinity of a curved surface on the bottom surface of the protective frame 3, and a part thereof has no rib. The take-out portion 6 is formed at the start of winding. The induction heating coil 7 is formed by winding an electric wire 8 around the electric wire winding core 5 in a coil shape, and is disposed along the curved surface of the protective frame 3.
Is induction-heated. Although not shown, the induction heating coil 7 is also provided on the bottom surface of the protection frame 3 as in the prior art.

The coil cover 9 is fixed to the protection frame 3 and holds the induction heating coil 7 with the induction heating coil 7 interposed between the protection frame 3 and the coil cover 9.

Hereinafter, in the above configuration, the electric wire 8 is connected to the protective frame 3.
The process of winding and forming the induction heating coil 7 will be described in detail.

First, when the electric wire 8 is aligned with the winding start take-out portion 6 and the protective frame 3 is rotated, the winding start take-out portion 6 is rotated.
Prevents the wire from shifting, the wire 8 is wound around the wire winding core 5 as a core. By adjusting the pulling direction and the pulling force of the electric wire 8 to be wound, the electric wire 8 is wound on the curved surface of the protective frame 3 in a manner similar to that of a spinning pin. The rotation of the protection frame 3 and the tension adjustment of the electric wire 8 are automatically performed by a dedicated device. (FIG. 3) Since the protective frame 3 has a coil formed on a curved surface portion with the electric wire winding core 5 as a nucleus, the shape can be maintained without bonding the coil portion, and the winding start take-out portion. Since the electric wire 8 is fixed in the rotation direction at 6, the coil does not move in the rotation direction. When the winding is completed, the coil cover 9 is fixed to the protective frame 3 with screws, the end of the electric wire 8 is cut, and the protective frame 3 is removed from the device, thereby completing the formation of the induction heating coil 7. In this state, the induction heating coil 7 is fixed by the protective frame 3 and the coil cover 9 which also has a function of preventing damage, and can be integrated into the main body 2.

The protection frame 3 having a bottom made of a non-magnetic material allows the magnetic flux generated from the induction heating coil 7 to pass through the inner pot 1 and has a high impact resistance against the taking in and out of the inner pot 1.

[0016]

According to the present invention, the protective frame has a bottom formed in a cylindrical shape with a bottom made of a non-magnetic material, and a portion rising from the bottom surface of the cylindrical shape with the bottom to a side surface is joined to a curved surface. Form a rib-shaped wire winding core along the circumferential direction of the protection frame and a rib-free winding start take-out part in the near part, and wind and form the wire in a coil shape on this wire winding core. Since the bottom of the protective frame is made of a non-magnetic material, it is easier to form than metal, and the magnetic flux generated from the induction heating coil is passed through the inner pot, and the protection frame has high impact resistance against taking in and out of the inner pot. In addition, the electric wire can be directly wound on a protective frame and easily formed into an induction heating coil without a winding jig. For this reason, there is no need to disassemble the jig and transport, store and assemble the induction heating coil alone, so that there is no need to worry about deformation and stable performance can be guaranteed.

Further, when it is not necessary to bond the coil so that it is not easily deformed, the heating and cooling in the furnace and the time are not required. It can provide the advantage of the deliciousness of the electromagnetic induction heating type rice cooker.

[Brief description of the drawings]

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

FIG. 2 is a perspective view showing a back surface of a protection frame of the rice cooker.

FIG. 3 is a perspective view showing a state in which an electric wire is wound around a back surface of the protection frame.

[Explanation of symbols]

 3 Protective frame 5 Wire winding core 6 Winding start take-out 7 Induction heating coil 8 Wire

Claims (1)

(57) [Claims] 1. An inner pot is detachably stored in a rice cooker main body,
In a rice cooker in which a protective frame for accommodating the inner pot is provided in the main body and an induction heating coil is disposed at the bottom of the protective frame, the protective frame (3) has a bottom having a bottomed cylindrical shape made of a non-magnetic material. Then, a portion rising from the bottom surface of the bottomed cylindrical shape to the side surface is formed into a curved surface, and a rib-shaped wire winding core portion (5) along the circumferential direction of the protection frame (3) is formed on this curved surface or a portion close to the curved surface. ) And a winding start take-out portion (6) without ribs are formed, and the electric wire (8) is aligned with the take-up start portion (6) from the bottom side of the protective frame (3), and the electric wire take-up core portion (5) is formed. ), Wherein the induction heating coil (7) is formed by winding the electric wire (8) into a coil shape.