JPS63216284A - Heating coil for electromagnetic cooker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a heating coil used in an electromagnetic cooker.

(Prior art) Conventional heating coils for induction cookers are generally made by spirally winding a litz wire made by twisting enameled wires (2), and impregnating it on a coil support base (1) made of plastic, for example. A heating coil that is adhesively fixed with a heat-resistant adhesive (3) such as varnish is used (FIG. 6 is a perspective view of this heating coil, and FIG. 7 is a sectional view thereof).

(Problem to be Solved by the Invention) However, conventional heating coils use litz wires, and their manufacture involves a stranding process to create litz wires from a predetermined number of enamelled wire strands. , two steps are required: supplying the Litz wire to a coil winding device and winding it into a coil.In particular, in the twisting process, a twisting machine is used to supply multiple reels of wire in concentric circles. Large-scale equipment was required, such as placing the entire supply around the supply or rotating the take-up reel of the winder in a direction perpendicular to the axial direction to perform winding. For this reason, processing costs were also high.

In addition, when the enameled wires are twisted together, processing deterioration occurs, which requires expensive enameled wires with excellent processing resistance, resulting in an increase in material costs.In view of the above, the present invention It was developed to solve these problems.

(Means for Solving the Problems) That is, the present invention provides a heating coil for an electromagnetic cooker in which electric wires are spirally wound on a flat coil support, and the electric wires are twisted with enamelled wires. This is a heating coil for an electromagnetic cooker characterized by using a plurality of heating coils assembled without being subjected to.

The present invention will be explained in detail below using drawings of embodiments.

1 and 2 are a perspective view and a sectional view of a heating coil for an electromagnetic cooker according to a specific example of the present invention, and FIG. 3 is a manufacturing apparatus thereof, and as shown in FIG. ) is supplied to the coil winding device (4), each wire is assembled immediately before coil winding, and the coil is directly wound between the coil support base (1) and the coil winding frame (6). Figures 1 and 2 show the completed heating coil.

Also, according to this means, as shown in Table 1, the coil winding rotation number N
There is no problem if N is small, but if N is 10Or, p, m,
If it exceeds this value, the wires may separate and come apart. Therefore, in such a case, the filament or tape-like body (8) (see FIG. 5) is wound spirally to prevent it from unraveling. FIG. 5 shows the completed heating coil in this case.

Note that (5) in Figure 3 is a thread-like body or a tape-like body (8).
It is a winding tool.

Table 1 (Function) As mentioned above, enamelled wire strands are collected in the pass line from directly supplying them to the coil winding device to being coiled, and are coiled as they are. Since the alignment process can be eliminated and the processing deterioration that occurs during the twisting process can be eliminated, it is possible to use an inexpensive enameled wire with low processing resistance, and the processing cost and material cost of the coil can be reduced.

In addition, if the above method causes the wires to come loose and it is difficult to operate the coil winding machine at high speeds, resulting in low productivity, it is possible to prevent the wires from coming loose by spirally wrapping the outer circumference of the enamelled wire that is assembled with a thread or tape. Since the coil winding machine can be operated at a rotation speed exceeding 10 Or, pm, high productivity can be obtained.

(Example) Examples of the present invention will be described below.

FIGS. 1 and 2 are a perspective view and a sectional view of a specific example of a heating coil for an electromagnetic cooker obtained by the present invention. The above is the coil winding device shown in Fig.
(do not use), gather the enamelled wires in a predetermined number in the pass line up to the coil winding without twisting them, and directly place them on the coil support stand (1) at a rotation speed of 6 Or, p, m or less. It is rolled.

In the above case, when coil winding is performed at a high speed of 1 o o r, p, m or more, if there is even a slight protrusion on the surface of the winding frame (6) or coil support stand (1), some of the wire may get caught on the protrusion. The windings become loose, and the windings overlap each other (part (7) in Fig. 4).

Therefore, in order to prevent the wires from coming loose, the coil of the above embodiment was wound spirally around the outer periphery of a plurality of enamelled wires that were not twisted together with the filament body (8), and was wound around the outer periphery of the enamelled wires at 100 r, p,
Wind at a rotation speed of mt or more. The heating coil for an electromagnetic cooker thus obtained is shown in FIG.

The filament is wound with thread (5) just before the coil spring, but if the wire diameter is around 0.5W, the winding pitch is 601+III+ or less as shown in Table 2. This prevents it from coming loose. For thin items of 0.5-s* or less, it is necessary to reduce the pinch when wrapping, and 0.5-s* or less.
For thicker items, it is possible to increase the size. Furthermore, the winding pitch can be increased by using a tape-like body instead of a thread.

Table 2 After winding the coil using the apparatus shown in Figure 3, the wound coil is taken out from the coil winding apparatus together with the coil support stand and the coil winding frame, and is bonded with a heat-resistant adhesive such as epoxy-based impregnated varnish. Fixed. At this time, the coil winding frame has been subjected to a special surface treatment such as Teflon coating in advance, and is also coated with a release agent such as silicone oil, so it can be easily removed, and the wound coil is adhered to the coil support base. It will be fixed.

(Effects of the Invention) As explained above, according to the present invention, materials are inexpensive and
Since a heating coil for an electromagnetic cooker can be formed at the same speed as the conventional method using a plurality of enameled wires that do not require any processing steps and are not twisted together, the manufacturing cost of the heating coil can be reduced.

[Brief explanation of the drawing]

Figures 1 and 2 are a perspective view and an enlarged sectional view of a heating coil for an electromagnetic cooker according to the present invention, and Figure 3 shows a plurality of enamelled wires assembled together without being twisted in manufacturing the heating coil of the present invention. Figure 4, which is a schematic diagram of a coil spring device for coil winding, shows a case where the wires come apart and overlap, which can happen when multiple enamelled wires are assembled without being twisted and coiled at high speed. FIG. 5 is a perspective view of the heating coil of the present invention in which a filament is wound to prevent unraveling. FIG. 6 is a perspective view of a conventional heating coil for an electromagnetic cooker.
FIG. 7 illustrates an enlarged cross-sectional view of that of FIG. (1)...Coil support stand, (2)...Enameled wire,
(3) Heat-resistant adhesive, (4) Coil spring device, (5) Thread wrapping tool, (6) Coil winding frame, (7) Unraveling line, (8)... filamentous body or third
figure

Claims (2)

[Claims] (1) In a heating coil for an electromagnetic cooker in which electric wire is spirally wound on a flat coil support, a plurality of untwisted enamelled wires are used as the electric wire. A heating coil for an electromagnetic cooker characterized by: (2) Gather multiple enameled wires together without twisting them,
In order to prevent the wires from separating and coming apart, the electromagnetic cooking according to claim (1) uses a material in which the outside of the assembled wires is spirally wound with a filament or a tape-like material. Dexterity heating coil.