JP2002093556A - Heating coil of electromagnetic cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable winding in a unit for a heating coil of an electromagnetic cooker, wherein a coil drawing out wire is fixed to a coil base by winding and wherein the whole is fused and solidified in a constant-temperature bath after winding. SOLUTION: The draw-out wires 1a and 1b at the beginning and the end winding parts of the heating coil 1 are wound and fixed to a draw out wire holder 2 of another body from the coil base to support the heating coil 1, and when this heating coil 1 is fused and solidified to be supported by the coil base, the draw out wire holder 2 is mounted on and retained by the coil base. By this, the draw-out wires 1a, 1b can be wound around and fixed before wound wires are solidified even if the heating coil 1 is not wound around the coil base directly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic cooker for cooking food in a pan by heating the bottom of the pan by electromagnetic induction, and more particularly to a spiral heating coil.

[0002]

2. Description of the Related Art Generally, the above-mentioned heating coil is formed by winding a litz wire in a hollow spiral shape, and then by fusing and solidifying the space between the windings to form a disk, and using a coil base made of an insulating material (heat-resistant resin). Supported. The lead wire at the beginning and end of winding of the coil winding is fixedly held on the coil base,
For this fixing, means for binding with a string or fixing with an adhesive is employed. However, such means is troublesome, and heat-resistant cords and adhesives have high material costs. In view of this, there is a coil base provided with a protruding portion integrally, and a lead wire wound around the protruding portion for fastening (see JP-A-7-57864).

[0003]

By the way, as described above, the heating coil is formed by spirally winding a litz wire,
Although the windings are fused and solidified so that the windings cannot be unwound, in this case, use a wire with a fusion layer in which the surface of a wire such as an enameled wire is pre-coated with the fusion material. The winding is used as it is in a thermostat to be fused and solidified. Therefore,
After this fusion process, the lead wire becomes hard and difficult to wind. Therefore, in the heating coil in which the lead wire is wound around the protrusion of the coil base and fixed,
Conventionally, a heating coil cannot be wound and solidified as a single unit.Litz wire is wound around the coil base itself, and the lead wire is wound around the protrusion of the coil base. And then a process of fusing and solidifying. However, in such a process, there is a problem that workability is poor because the coil has to be wound directly on the coil base and productivity is low. Therefore, an object of the present invention is to improve the productivity by enabling winding and solidification of a single heating coil while employing a structure in which a lead wire is wound around and easily fastened.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a coil base formed of an insulator by fusing and solidifying the space between spirally wound litz wires to form a disk. In the heating coil of the electromagnetic cooker to be supported by the coil cooker, the lead wires at the beginning and end of winding are wound around a lead wire holder separate from the coil base, and the lead wire holder is held by the coil base ( Claim 1). According to the first aspect, since the lead wire holder for winding the lead wire is separate from the coil base, the heating coil is wound alone, and the lead wire is wound around the lead wire holder and then fused and solidified. Processing can be performed and combined with the coil base to be integrated.

[0005] The lead wire holder includes a guide portion for leading the lead wire at the beginning of winding from the center of the disk body to the outer periphery.
It is preferable that the guide portion includes a wire fastening portion that protrudes from an outer peripheral end of the guide portion and is wound around the lead wire at the start and end of the winding, and is fitted to the coil base via the guide portion ( Claim 2).

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows a heating coil, FIG. 1 (A) is a top view, FIG. 1 (B) is a side view, FIG.
(C) is a rear view. In FIG. 1, a heating coil 1
Is that a litz wire with a fusion layer is spirally wound to form a hollow disk, and a lead wire 1 at the start and end of winding is formed.
a and 1b are wound around the lead wire holder 2 and fixed, and then heated in a thermostat (not shown) (for example, 16
(0 ° C, 20 minutes), the space between the windings is fused and solidified to maintain the shape shown.

FIG. 2 is an enlarged view of the lead wire holder 2.
(A) is a top view, (B) is a side view, and (C) is a back view. The lead wire holder 2 molded from a heat-resistant resin is positioned at the center side end of the heating coil 1 located on the center side of the disk.
Similarly, the guide portion 2a is formed in a T-shape including a guide portion 2a having a tapered width extending to an outer peripheral end protruding to the outer peripheral side, and a pair of wire fastening portions 2b protruding left and right at the outer peripheral end. . On the back side of the guide portion 2a, a lead wire 1a at the beginning of winding is provided.
Is formed, and notches 2d and 2e are provided at the center and outer periphery of the bottom.

[0008] The lead wire holder 2 is, as shown in FIG.
The lead wire 1a, which is arranged in the radial direction along the back surface of the disc body of the heating coil 1 and starts to wind through the notch 2d and the guide groove 2c (FIG. 2), is guided from the disc body center side to the outer periphery side. This lead wire 1a is connected to one wire fastening portion 1b through a notch 2e.
It is wound. Also, the lead wire 1b at the end of winding is
One winding is made around the other wire fastening portion 1b. Leader 1
A crimp terminal 3 is attached to each of the tips of a and 1b.

FIG. 3 is a top view of a coil base supporting the heating coil 1, FIG. 4 is a perspective view of a portion P in FIG. 3, and FIG. 5 is a sectional view of the coil base supporting the heating coil 1 taken along line VV in FIG. It is a longitudinal cross-sectional view along. In FIG. 3, a coil base 4 made of a heat-resistant resin is composed of a cylindrical hub 4a, an annular frame 4b, and radial spokes 1c connecting them, and the frame 4b and the spokes 4c are formed in an H-shaped cross section. ing.
At three positions of the frame 4b, mounting legs 4d are provided.
Also, at the center of the hub 4a, through a cross-shaped spoke,
A sensor holder 4e for holding a temperature sensor (not shown) is provided.

As shown in FIG. 5, the heating coil 1 is fitted to a hub 4a through a hollow hole 1c (FIG. 1), and is placed and supported on the upper surface of the coil base 4. Reference numeral 5 denotes a ferrite core for preventing magnetic flux leakage of the heating coil 1, and a coil base 4
Is mounted in advance in the spoke 4c. At this time, the center side of the lead wire holder 2 is supported by the ribs 4f (FIG. 3) of the coil base 4 and the outer peripheral side is supported by the frame 4b, but as shown in FIG. A recess 4g is formed in the lead wire holder 2 so that the guide portion 2a is
g and positioned in the left and right direction,
The guide portion 2a is attached to the protruding piece 4h that is partially cut off in the recess 4g.
The recesses 2f (FIGS. 3 and 4) formed in the first gear are engaged with each other and positioned in the front-rear direction. The heating coil 1 on the coil base 4 is pressed and held by a coil holder (not shown) hung on the coil base 4.

Finally, a winding method of the heating coil 1 using a rotary winding jig will be described with reference to FIG. In FIG. 6, the winding jig 6 includes a turntable 7 that rotates around a vertical axis, one or more winding frames 8 stacked thereon, and a holding plate 9 stacked on the uppermost stage. The turntable 7 can be easily rotated manually or by driving a motor.
It is supported by a bearing (not shown). A guide rod 10 is vertically set up at the center of the turntable 7, and the upper end thereof is threaded. A pair of cylindrical pins 7a are fixed to the upper surface of the turntable 7 with the center therebetween.

The bobbin 8 is provided with a through hole at the center thereof for fitting with the guide rod 11, and a bobbin 8a is provided in a step shape so as to surround it. The height and outer diameter of the winding drum 8a are set to a size corresponding to the diameter of the hollow hole 1c of the heating coil 1 and the litz wire. A cylindrical pin 8b corresponding to the cylindrical pin 7a is fixed to the upper surface of the winding drum 8a, and the cylindrical pin 7a of the turntable 7 or the cylindrical pin 8b of the lower winding frame 8 is fitted to the back surface of the winding frame 8 (not shown). A cylindrical recess to be combined is provided.
Further, a concave portion 8c for accommodating the lead wire holder 2 is formed on the upper surface of the winding frame 8. The holding plate 9 is a disk having the same diameter as the winding frame 8 and has a through hole at the center for fitting with the guide rod 10, and a pair of holes 9 a for fitting the cylindrical pin 8 b of the winding frame 8 across the hole. Has been opened.

In such a jig 6, a winding frame 8 is stacked on a turntable 7 prior to a winding operation, and finally, a holding plate 9 is stacked, and a nut 11 is screwed into a guide rod 10 and fastened and fixed. At this time, the rotating pin 7 and the cylindrical pin 7 of the bobbin 8
a and 8b are sequentially fitted into cylindrical recesses on the back of the bobbin, and the cylindrical pins 8b of the uppermost bobbin 8 are fitted into holes 9a of the holding plate 9 to integrally connect the whole. In order to wind the heating coil 1 using this jig 6, first, one end of a litz wire is wound around one wire fastening portion 2a of the lead wire holder 2 as a lead wire 1a at the beginning of winding, and then guided by the guide portion 2a. Groove 2
Pull out from notch 2d through c.

The lead wire holder 2 is fitted into the concave portion 8c of the lowermost winding frame 8, the drawn litz wire is wound around the winding drum 8a, and the jig 6 is rotated in the direction of the arrow while pulling the litz wire to form a spiral. Wound in a shape. After the predetermined number of windings are completed, the end of the litz wire is connected to the lead wire 1 at the end of winding.
B is wound around the other wire fastening portion 2a as b. Next, this line is directly extended to the second bobbin 8, and the same operation is repeated. When the winding of all the stages is completed, the litz wire is cut, and the jig 6 in the winding state is put into a thermostat as it is to perform fusion and solidification of the winding. When the solidification is completed, the lead wires are cut off, the jig 6 is disassembled, and the heating coils 1 are taken out one by one. 1 and 2 show a heating coil 1 manufactured in this manner. The shape and holding structure of the lead wire holder 2 and the winding jig 6 shown in the illustrated embodiment are merely examples, and the present invention is not limited to these shapes and structures.

[0015]

As described above, according to the present invention, the lead wire of the heating coil is wound around the lead wire holder separate from the coil base, and the lead wire holder is held by the coil base. The heating coil can be quickly wound by using a dedicated jig, and the productivity of the heating coil can be remarkably increased.

[Brief description of the drawings]

FIG. 1 shows a heating coil according to an embodiment of the present invention;
(A) is a top view, (B) is a side view, and (C) is a back view.

2A and 2B show a leader holder in FIG. 1, wherein FIG. 2A is a top view, FIG. 2B is a side view, and FIG.

FIG. 3 is a plan view of a coil base.

FIG. 4 is a perspective view of a part P in FIG. 3;

5 is a longitudinal sectional view showing a state in which the heating coil of FIG. 1 is supported on the coil base of FIG. 3;

FIG. 6 is a perspective view of a jig for winding the heating coil of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heating coil 1a Lead wire at the beginning of winding 1b Lead wire at the end of winding 2 Lead wire holder 2a Guide part 2b Wire fastening part 4 Coil base 5 Ferrite core 6 Winding jig

Claims (2)

[Claims] 1. A heating coil for an electromagnetic cooker in which a spirally wound litz wire is fused and solidified to form a disk body and supported on a coil base made of an insulating material. A heating coil for an electromagnetic cooker, wherein a lead wire is wound around a lead wire holder separate from the coil base, and the lead wire holder is held by the coil base. 2. A guide portion for guiding the lead wire at the beginning of winding from the center side of the disk body to the outer peripheral side, the lead wire holder protruding from an outer peripheral end of the guide portion, and the winding start and winding end are provided. The heating coil of the electromagnetic cooker according to claim 1, comprising a wire fastening portion around which the lead wire is wound, and fitted to the coil base via the guide portion.