JPH06333669A - Induction heating coil device - Google Patents

Abstract

PURPOSE:To provide an accurately positioned inexpensive induction heating coil device by winding a litz wire directly round a coil support board without using a winding jig when a coil is formed, and forming the coil without using the winding jig and a fused copper wire in an induction heating coil device. CONSTITUTION:A stepped surface is arranged between the outer peripheral surface of a protective frame 1, an inner base 2 and an outer base 3, and the void is formed, and respective coil winding grooves are formed. A litz wire formed by bundling ordinary thin insulating copper wires is wound in the coil winding grooves, and an induction coil 4 is formed, and a soft magnetic ferrite plate 5 is installed on the outside bottom surfaces of the inner base 2 and the outer base 3, and an induction heating coil device is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction heating coil device used for a rice cooker or the like using induction heating, in which an outer bottom surface of a coil supporting substrate composed of a coil winding groove formed by a protective frame and a resin base is provided. The present invention relates to an induction heating coil device configured to directly wind a coil for induction heating in a spiral shape.

[0002]

2. Description of the Related Art FIG. 5 shows a cross-sectional view of a conventional induction heating coil device, and FIG. In FIG. 5, the conventional induction coil 7 for passing a high frequency current of 20 KHZ to 100 KHZ is used by bundling about 20 self-bonding copper wires with a wire diameter of about 0.5 mm and forming them in a predetermined shape in advance. The winding coil is wound in a spiral shape, and the wires are fusion-molded using heat or a solvent, and then removed from the winding jig to form the induction coil 7. The resin base 8 and the protection frame 6 are formed of a heat-resistant resin material of FRP in which glass fiber is mixed with resin, and the induction coil 7 is arranged in the space formed between the protection frame 6 and the resin base 8 and incorporated. The screw 10 is used to fix the resin base and the protective frame and to support the induction coil 7. Next, an adhesive is applied to the soft magnetic ferrite plate bonding groove of the resin base 8 and the soft magnetic ferrite plate 9 is fixed to form the induction heating coil device shown in FIG.

[0003]

In assembling an induction heating coil device, forming the induction coil requires the most time. Self-fusing Litz copper wire coated with adhesive on the copper wire is wound around the winding jig in a spiral shape, and an electric current is applied to the copper wire afterwards to heat the adhesive applied to the copper wire coating. Melt and fix the entire litz wire by fusion. After that, it was removed from the winding jig to complete the induction coil, but there was a drawback that it took too much manufacturing time.

[0004]

According to the present invention, in order to eliminate these drawbacks, a protection frame 6 and a resin base 8 which have been conventionally used are integrated into a coil supporting board, and an induction coil is assembled to the coil supporting board. An induction heating coil device in which an induction coil is formed by directly winding a wire formed by bundling a plurality of copper wires of about 0.5 mm around a coil winding groove portion for forming a coil by forming a coil forming void. Characterize.

That is, according to the present invention, a coil wound in a spiral shape is housed in a coil-shaped groove formed between a bowl-shaped protection frame and an outer bottom surface of the protection frame and a resin base, and the outer surface of the resin base is accommodated. In the induction heating coil device having a soft magnetic ferrite plate attached to the resin base, the resin base is formed by an inner base attached to the center of the outer bottom surface of the protective frame and an outer base attached to the outer peripheral surface of the outer bottom surface. And a coil winding groove formed by a stepped surface that opens in the outer peripheral direction of the protection frame is provided between the outer base and the protection frame, and the induction coil is directly wound along the coil winding groove. It is a characteristic induction heating coil device.

[0006]

In order to form the induction coil, the protection frame and the resin base are separately separated, and the self-bonding copper wire is wound around the winding jig to form the induction coil, which is used in combination. These are integrated to form a coil winding groove for winding the induction coil in advance on a coil support substrate including an inner base and an outer base that form a coil winding groove between the resin base and the protective frame. The induction coil can be wound directly in the coil winding groove to form the induction coil, so the induction coil can be positioned accurately, and it is not necessary to use self-bonding copper wire for copper wire, and non-self-bonding copper wire can be used. Material costs can also be reduced.

[0007]

Embodiments of the present invention will be described with reference to the drawings. A supporting substrate with a coil winding groove is shown in FIG. The inner base shown in FIG. 2 (c) having a stepped surface 2a forming a winding groove for winding a coil between the protective frame 1 made of a bowl-shaped FRP shown in FIG. 2 (b). 2 and the protective frame, the outer base 3 shown in FIG. 2 (d) having a stepped surface 3a forming a winding groove for winding a coil is assembled by a screw stopper or the like, and shown in FIG. 2 (a). It is assembled on a support substrate with a coil winding groove, and a litz wire obtained by bundling thin wires of a conductive wire is spirally wound around the coil winding groove 11a and the coil winding groove 11b to form the induction coil 4 shown in FIG. The litz wire used in the present invention may be a normal non-self-bonding copper wire, and the beginning and end parts of the winding are provided with holes or the like in part of the inner base 2 and the outer base 3, and the litz wire is provided in that part. Passing the wire prevents the induction coil from being unraveled.
The inner base 2 and the outer base 3 are coated with an adhesive agent on the ferrite plate bonding portion provided on the outer surface thereof, and the soft magnetic ferrite plate 5 is bonded and fixed to the supporting substrate with the coil winding groove, and the induction heating coil device shown in FIG. And FIG. 3 shows a protective frame 1 shown in FIG. 1, an inner base 2 and an outer base 3 which are integrally formed in advance as a support substrate 12 with a coil winding groove.
The outer base 3 is integrally formed of heat resistant resin, and a wire is wound around the coil winding groove to form an induction heating coil device.

[0008]

As described above, the present invention includes a protective frame and
Form a coil winding groove between the inner base and the outer base,
The litz wire, which is a bundle of thin copper wires, is wound directly on the coil winding groove to form an induction coil, and the coil supporting board with coil groove is used to position the induction coil accurately and facilitate assembly. Therefore, a low-cost induction heating coil device can be provided.

[Brief description of drawings]

FIG. 1 is a sectional view showing an induction heating coil device according to the present invention.

2A and 2B are views showing a support substrate with a coil winding groove of an induction heating coil device according to the present invention, wherein FIG. 2A is an assembled sectional view, FIG. 2B is a sectional view of a protective frame, and FIG. 2C is a sectional view of the inner base, and FIG. 2D is a sectional view of the outer base.

FIG. 3 is a diagram showing another embodiment of the present invention, which is shown in FIG.
Is a cross-sectional view, and FIG. 3B is a rear view.

FIG. 4 is an external perspective view of components of a conventional induction heating coil device.

FIG. 5 is a sectional view of a conventional induction heating coil device.

[Explanation of symbols]

 1 Protective Frame 2 Inner Base 2a Stepped Surface 3 Outer Base 3a Stepped Surface 4 Induction Coil 5 Ferrite Plate 6 Protective Frame 7 Induction Coil 8 Resin Base 9 Ferrite Plate 10 Screw 11a, 11b Coil Roll Groove 12 Support Board with Coil Groove

Claims (1)

[Claims] 1. A bowl-shaped protective frame, and a coil wound in a coil winding groove formed between an outer bottom surface of the protective frame and the resin base are housed, and a soft magnetic material is formed on the outer surface of the resin base. In the induction heating coil device to which the ferrite plate of the material is attached, the resin base is formed by an inner base attached to the center of the outer bottom surface of the protective frame and an outer base attached to the outer peripheral surface of the outer bottom surface. A coil winding groove formed by a stepped surface opened in the outer peripheral direction of the protection frame is provided between the protection frame and the protection frame, and the induction coil is directly wound along the coil winding groove. Induction heating coil device.