JP4411764B2 - Electromagnetic cooker heating coil - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electromagnetic cooker that heats the bottom of a pot by electromagnetic induction and cooks food in the pot, and more particularly to a spiral heating coil thereof.
[0002]
[Prior art]
The heating coil is generally formed in a disk body after litz wires are wound in a hollow spiral shape, and the windings are fused and solidified, and is supported by a coil base made of an insulating material (heat-resistant resin). The lead wire at the start and end of winding of the coil winding is fixed and held on the coil base. For this fixing, means for binding with a string or fixing with an adhesive is employed. However, such means are labor intensive, and heat-resistant strings and adhesives are expensive. Therefore, there is a coil base provided with a projecting portion integrally and a lead wire is wound around the projecting portion (see Japanese Patent Application Laid-Open No. 7-57864).
[0003]
[Problems to be solved by the invention]
By the way, as already mentioned, the heating coil winds the litz wire in a spiral shape and then fuses and solidifies the windings so that the winding cannot be unwound. A wire with a fusion layer in which a fusion material is preliminarily applied to the surface of the wire is used, and the winding is put in a constant temperature bath as it is to be fused and solidified. Therefore, after this fusion process, the lead wire becomes hard and it is difficult to wind it. For this reason, in a heating coil in which the lead wire is wound around and fixed to the protruding portion of the coil base, conventionally, the heating coil cannot be wound and solidified alone, and litz wire is wound using the coil base itself as a winding frame. Then, after winding the lead wire around the coil base protrusion, the whole was put in a thermostatic bath and fused and solidified. However, such a process has a problem that workability is poor and productivity is low because the coil base must be wound directly.
Therefore, an object of the present invention is to improve productivity by enabling winding and solidification with a single heating coil while adopting a structure in which a lead wire is wound and fastened.
[0004]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention provides a heating coil for an electromagnetic cooker in which a winding between litz wires wound in a spiral shape is fused and solidified to be formed into a disk and supported on a coil base of an insulator. A guide portion for guiding the lead wire at the beginning of winding of the heating coil from the center side to the outer peripheral side of the disk body, and a lead wire at the start and end of winding of the heating coil projecting from the outer peripheral side end portion of the guide portion. Provided separately from the coil base, a lead wire holder composed of a wire clamp portion to be wound, and after winding the lead wire at the start and end of winding of the heating coil around the wire clamp portion of the lead wire holder, The lead wire holder is held by the coil base by fitting the guide portion to 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]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIGS. FIG. 1 shows a heating coil, FIG. 1 (A) is a top view, FIG. 1 (B) is a side view, and FIG. 1 (C) is a back view. In FIG. 1, a heating coil 1 is formed in a hollow disk by winding a litz wire with a fusion layer in a spiral shape, and lead wires 1 a and 1 b at the start and end of winding are wound around a lead wire holder 2. Then, it is heated in a thermostat (not shown) (for example, 160 ° C., 20 minutes), and the windings are fused and solidified to maintain the shape shown in the figure.
[0006]
2A and 2B are enlarged views of the lead wire holder 2, wherein FIG. 2A is a top view, FIG. 2B is a side view, and FIG. The lead wire holder 2 molded from heat-resistant resin has a guide portion whose width increases in a tapered shape from the center side end portion located on the center side of the disc body of the heating coil 1 to the outer end side end portion that also projects to the outer periphery side. It is formed in a T-shape composed of 2a and a pair of wire-fastening portions 2b projecting to the left and right of the outer peripheral side end portion. A guide groove 2c that guides the lead wire 1a at the start of winding is formed on the back surface side of the guide portion 2a, and notches 2d and 2e are provided on the center side and the outer peripheral side of the bottom portion.
[0007]
As shown in FIG. 1, the lead wire holder 2 is arranged in the radial direction along the back surface of the disc body of the heating coil 1, and the lead wire 1a at the start of winding is disc-shaped via the notch 2d and the guide groove 2c (FIG. 2). Lead from the body center side to the outer periphery side. The lead wire 1a is wound twice around one wire clamp portion 2b through a notch 2e. Further, the winding end lead wire 1b is wound once around the other wire retaining portion 1b. Crimp terminals 3 are attached to the leading ends of the lead wires 1a and 1b, respectively.
[0008]
3 is a top view of the coil base that supports the heating coil 1, FIG. 4 is a perspective view of a portion P in FIG. 3, and FIG. 5 is a vertical cross-section of the coil base that supports the heating coil 1 along line VV in FIG. FIG. In FIG. 3, the coil base 4 made of 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 spoke 4c are formed in an H-shaped cross section. ing. Mounting legs 4d are provided at three locations on the frame 4b. A sensor holding portion 4e that holds a temperature sensor (not shown) is provided at the center of the hub 4a via a cross-shaped spoke.
[0009]
As shown in FIG. 5, the heating coil 1 is fitted into the hub 4 a via the hollow hole 1 c (FIG. 1) and is placed and supported on the upper surface of the coil base 4. Reference numeral 5 denotes a ferrite core that prevents magnetic flux leakage of the heating coil 1 and is pre-mounted in the spoke 4 c of the coil base 4. At that time, the center side of the lead wire holder 2 is supported by the rib 4f (FIG. 3) of the coil base 4 and the outer peripheral side is supported by the frame body 4b. As shown in FIG. 4, the support portion of the frame body 4b is supported. In the lead wire holder 2, the guide portion 2a is fitted in the recess 4g and positioned in the left-right direction, and the guide portion is provided in the protruding piece 4h left in a part of the recess 4g. The recess 2f (FIGS. 3 and 4) formed in 2a is engaged and positioned in the front-rear direction. The heating coil 1 on the coil base 4 is pressed and held by a coil presser (not shown) that is fastened to the coil base 4.
[0010]
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 about a vertical axis, a one-stage or multiple-stage winding frame 8 that is stacked thereon, and a pressing plate 9 that is stacked on the uppermost stage. The turntable 7 is supported by a bearing (not shown) so that it can be easily rotated manually or by motor drive. A guide rod 10 is vertically raised at the center of the turntable 7, and a screw is cut at an upper end portion thereof. In addition, a pair of cylindrical pins 7 a are fixed to the upper surface of the turntable 7 with the center in between.
[0011]
The winding frame 8 is provided with a through-hole that fits with the guide rod 11 in the center, and a winding drum 8a is provided in a stepped shape so as to surround it. The height and outer diameter of the winding drum 8a are set to a size commensurate with 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 rear surface of the winding frame 8 (not shown). A cylindrical recess to be joined is provided.
[0012]
Further, a recess 8 c for accommodating the lead wire holder 2 is formed on the upper surface of the reel 8. The holding plate 9 is a disc having the same diameter as the winding frame 8, and a through hole that fits with the guide rod 10 is formed at the center, and a pair of holes 9 a that fit the cylindrical pin 8 b of the winding frame 8 with the through hole interposed therebetween. Has been opened.
[0013]
Such a jig 6 stacks the winding frame 8 on the turntable 7 prior to the winding work, and finally stacks the presser plate 9, and screws the nut 11 into the guide rod 10 to fix it. At that time, the cylindrical pins 7a and 8b of the turntable 7 and the reel 8 are sequentially fitted into the cylindrical recesses on the rear surface of the reel, and the cylindrical pin 8b of the uppermost reel 8 is fitted into the hole 9a of the presser plate 9. Let the whole be connected together. In order to wind the heating coil 1 using this jig 6, first, one end of the litz wire is wound as one lead wire 1a around one wire clamp portion 2b of the lead wire holder 2, and then guided by the guide portion 2a. Pull out from the notch 2d through the groove 2c.
[0014]
Then, the lead wire holder 2 is fitted into the recess 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 it, so that it is wound in a spiral shape. To line. When a predetermined number of windings have been completed, the end of the litz wire is wound around the other wire fastening portion 2b as a lead wire 1b at the end of winding. Next, this line is extended as it is to the second reel 8 and the same operation is repeated. When the winding of all the stages is completed, the litz wire is cut, and the wound jig 6 is put in a constant temperature bath as it is, and the winding is fused and solidified. When solidification is completed, the lead wires are separated from each other, the jig 6 is disassembled, and the heating coils 1 are taken out one by one. FIG.1 and FIG.2 has shown the heating coil 1 manufactured in this way. Note that 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]
【The invention's effect】
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. Winding can be performed quickly using the jig, and the productivity of the heating coil can be significantly increased.
[Brief description of the drawings]
FIG. 1 shows a heating coil according to an embodiment of the present invention, in which (A) is a top view, (B) is a side view, and (C) is a back view.
2 shows the lead wire holder in FIG. 1, (A) is a top view, (B) is a side view, and (C) is a back view. FIG.
FIG. 3 is a plan view of a coil base.
4 is a perspective view of a P part in FIG. 3. FIG.
5 is a longitudinal sectional view showing a state where the heating coil of FIG. 1 is supported on the coil base of FIG. 3;
6 is a perspective view of a jig for winding the heating coil of FIG. 1. FIG.
[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 portion 2b Wire clamp portion 4 Coil base 5 Ferrite core 6 Winding jig

Claims (1)

In a heating coil of an electromagnetic cooker that is fused and solidified between the windings of a litz wire wound in a spiral shape and formed into a disc body, and supported on a coil base of an insulator,
A guide part that guides the lead wire at the beginning of winding of the heating coil from the center side to the outer periphery side of the disc body, and projects from the outer peripheral side end of the guide part, and the lead wires at the start and end of winding of the heating coil are wound. A lead wire holder composed of a wire fastening portion provided as a separate body from the coil base, and after winding the lead wire at the start and end of winding of the heating coil around the wire fastening portion of the lead wire holder, A heating coil of an electromagnetic cooker, wherein the lead wire holder is held on the coil base by fitting a guide portion to the coil base .

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