JPS5849620Y2 - Trance - Google Patents

Description

[Detailed description of the invention] The present invention relates to a transformer in which the part of the coil that comes into contact with the iron core is covered with an insulating sheet to maintain insulation between the iron core and the bobbinless coil. The aim is to provide a product with excellent insulation properties using fewer parts.

Figure 1 shows the coils used in conventional transformers.
It was constructed as shown in Figure 2.

That is, a rectangular cylindrical insulating pipe 2 is fitted inside the bobbinless coil 1, and U-shaped insulators 3 and 4 are placed over the outside of the surface in contact with the iron core.

In this configuration, the end face of the insulating pipe 2 and the U-shaped insulator 3,
As shown in Fig. 2, there is a line contact with the end face of the coil 1, and if the position of the insulating pipe 2 and the U-shaped insulators 3 and 4 is even slightly shifted, the insulation between the coil 1 and the iron core will be impaired. It becomes enough,
The quality was extremely unstable.

In addition, insulating tape is wrapped around the contact surface of the coil with the iron core to insulate the coil and the iron core, but the work of wrapping the insulating tape is time-consuming and is poor in terms of productivity. It had become a thing.

Furthermore, a configuration as shown in Fig. 1 has been developed in which a tongue piece inserted between the coil and the insulating pipe is integrally provided in the portion of the U-shaped insulator corresponding to the insulating pipe.
According to this configuration, the space between the end face of the insulating pipe and the end face of the U-shaped insulator is completely covered by the tongue piece, and even if the two are misaligned, the insulation between the coil and the iron core will be insufficient. However, the work of inserting the insulating pipe by folding the tongue pieces into the inside of the coil from the top and bottom of the coil makes it difficult to insert the insulating pipe because the insertion tip of the insulating pipe hits one of the tongue pieces, resulting in poor work efficiency. However, there were drawbacks such as the need to fix the tongue piece to the inner surface of the coil with tape or the like in advance.

Further, even when the tongue piece is positioned between the insulating pipe and the iron core, there is a drawback that the iron core gets caught on the end face of the tongue piece when the iron core is assembled, resulting in poor workability.

The present invention eliminates the above-mentioned drawbacks of the prior art.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings 3 to 9.

First, in FIG. 3, reference numeral 5 is a square-shaped iron core constructed by laminating EI type laminated iron cores, and the central magnetic leg of this iron core 5 has a bobbin-less coil 6 wound in perfect alignment.
is wrapped.

An insulating sheet 7.8 is provided on the surface of this coil 6 in contact with the iron core 5.
is located.

In FIG. 3, it is assumed that an insulating plate, which will be described later, is hidden from view by the coil 6.

This insulating sheet 7.8 is constituted by a single press board, etc., as shown in FIGS. 4 to 7.

That is, this insulating sheet 7.8 consists of a flat plate as shown in FIG. A piece that covers the bottom surface, d is a piece that covers the inner surface of the coil 6, e is a piece that covers a part of the upper surface of the coil 6, f9g is a piece that covers the other inner surface of the coil 6, and C piece. A notch 9 is made only between the and f9g pieces, between the e piece and the f9g piece, a, l) between the pieces, b, between the C pieces, c
, d Katama, d.

Folds 10 are provided between the C pieces, between the d and f pieces, and between the d9g pieces so that they can be bent, and when these are bent and assembled, the result will be as shown in FIG. 7.

Moreover, when it is actually incorporated into the coil 6, it becomes as shown in FIGS. 4 and 5.

According to the insulating sheet 7.8 having this configuration, on the upper surface of the coil 6, pieces a and e overlap and cover the coil 6, so that
The insulation between the coil 6 and the iron core 5 is sufficient, and when the iron core 5 is assembled, it is completely possible to eliminate the problem of the e-piece getting caught on the iron core 5 and requiring time and effort for assembly.

It should be noted that the 192 pieces need to be configured to have a wide enough width to overlap when the two insulating sheets 7.8 are combined.

These 112 pieces are arranged inside the part of the coil 6 located outside the iron core 5, and insulate the joint surface of the iron core 5 with the central magnetic leg, and these 192 pieces are longer than the central magnetic leg. , protrudes somewhat from the end face of the iron core 5.

Further, the insulating sheet 7.8 is placed over the portion of the coil 6 that fits into the window of the iron core 5.

In order to further ensure the insulation of the inner part of the coil 6 covered by the f2g pieces, as shown in FIG. A rectangular insulating plate 11 is inserted for covering, thereby constructing a transformer in one embodiment of the present invention.

In addition, as shown in FIG. 9, the insulating sheet 7.8 is made by forming a synthetic resin layer 13 such as polypropylene on the inner surface of the pressboard or paper material 12, and making it highly moisture-proof as an insulating sheet. It is also possible to adopt a configuration that protects the coil 6 from.

As the transformer of the present invention is constructed as described above, the end surface of the insulating sheet has an overlap margin on the upper surface of the coil, so that sufficient insulation between the bobbinless coil and the iron core can be maintained, and the iron core can be inserted. The insulating sheet does not get caught on the end face of the insulating sheet and gets damaged, and the assembly work can be carried out extremely smoothly, which is excellent in terms of quality and productivity.

Moreover, since a single insulating sheet is bent and covered with the coil, there is no misalignment, and in this respect, the insulation is extremely stable, which has great practical value. It is a big thing.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view of a coil used in a conventional transformer, Fig. 2 is a partially cutaway perspective view of the same coil, Fig. 3 is a perspective view showing an embodiment of the transformer of the present invention, and Fig. 4 is a perspective view of a coil used in a conventional transformer. FIG. 5 is a partially cutaway perspective view of the coil used in the transformer while it is being assembled; FIG. 6 is a perspective view of the insulating sheet to be incorporated into the coil in an expanded state; FIG. 7 8 is a partially cutaway perspective view of the coil, and FIG. 9 is a sectional view showing an example of the insulating sheet incorporated into the coil. be. 5... Iron core, 6... Coil, 7, 8...
...Insulating sheet, 9...Notch, 10.
...Fold line, 11...Insulating board.

Claims (2)

[Scope of utility model registration request] (1) A part of the bobbinless coil to be incorporated into the iron core that fits into the window of the iron core is covered with the top surface, outer surface, bottom surface, inner surface, and part of the top surface of the coil, as well as a piece that covers the other inner surface. By providing folds and cuts in one insulating plate, an integral insulating sheet is covered, and one side of the insulating sheet covers the inner surface of the part other than the part that fits into the window of the iron core of the coil. A transformer made by inserting an insulating plate. (2) The transformer according to claim 1, which uses an insulating sheet made of presspod or paper with synthetic resin layers formed on both sides as the insulating sheet.