JPH0139643B2 - - Google Patents

Description

Detailed Description of the Invention Field of Application of the Invention The present invention provides insulation between the windings of a transformer in which a primary winding and a secondary winding are arranged concentrically using a molded bobbin, as well as electrostatic shielding. The present invention relates to a composite insulating shield for a transformer, which reduces the number of man-hours required for winding windings around the outer circumferential surface, and improves mutual insulation and electrostatic shielding of the windings.

Prior Art and Problems Even in a conventional transformer of this type, in order to insulate the windings and shield them from static electricity, the primary winding 2 is wound around the lower layer of the molded bobbin 1, as shown in FIG. As shown in FIG. 3, an insulating tape 5 made by applying adhesive glue 4 to the entire surface of one side of an extremely thin film 3 (about 0.025 mm, for example) as shown in FIG. 2 is placed on the top surface of the primary winding 2 as shown in FIG. Wrap it several times, and then wrap the copper foil 6 on top of it as shown in Figure 4.
Furthermore, after wrapping the insulating tape 5 a plurality of times on this, the secondary winding 7 was wound on the upper layer as shown in FIG. However, in this case, since the insulating tape 5 is extremely thin, the primary winding 2 and the secondary winding 7
In order to completely insulate each other, the insulating tape 5 must be wrapped around the primary winding 2 many times to a thickness that can guarantee dielectric strength, and the number of man-hours required to wrap the insulating tape 5 is reduced. There were more of them. Further, as shown in FIG. 4, a copper foil 6 must be interposed between the insulating tapes 5 for electrostatic shielding, which further increases the number of man-hours and complicates the work. Furthermore, when winding the insulating tape many times, as shown in FIG.
It may be knitted and wound from side to side, forming bobbin 1
A gap 8 may be formed between the inner wall of the
When the copper foil 6 is wound or the secondary winding 7 is wound in such a state, as shown in FIG. This caused dielectric breakdown, and the electrostatic shielding between the windings was incomplete. Also,
By wrapping the insulating tape 5 multiple times, as shown in FIG. 1, unevenness or wrinkles 9 may occur on the upper surface of the insulating tape 5. As shown in FIG. 4, the finish after winding the secondary winding 7 was unsightly.

Purpose of the Invention The present invention has been made to solve the above-mentioned problems, and is a transformer that can reduce the number of man-hours for winding the windings around the outer circumferential surface and improve insulation between the windings and electrostatic shielding. The purpose is to provide a composite insulating shield for containers.

SUMMARY OF THE INVENTION According to the present invention, the above object is to provide a transformer in which a primary winding and a secondary winding are arranged concentrically using a molded bobbin, and a resin film having a width substantially the same as the width of the molded bobbin. One or more sheets and an insulating flexible paper-like material having approximately the same width are superimposed in a multi-layered manner, and between any one of the resin film and the flexible paper-like material, there is approximately A shielding material having the same width and at least one side wrapped in a resin film should be combined, and the resin film, flexible paper-like material, and shielding material should be partially attached to each other at appropriate locations for insulation. This is achieved by providing a composite insulating shield for a transformer, which is formed by wrapping one or more turns around the outer peripheral surface of a winding portion and cutting it to a length such that both ends overlap.

Embodiments of the Invention Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Composite insulation shield 10 for a transformer according to the invention
As shown in FIG. 5, the resin film 11 and
Insulating flexible paper-like materials 12 are stacked in multiple layers, and a shielding material 13 is interposed between them. The resin film 11 is made of an insulating film such as polyimide, which is thicker (for example, about 0.25 mm) than the conventional film 3 shown in FIG. 2, and has a width between the inner walls of the molded bobbin 1 shown in FIG. It is formed into a tape shape having approximately the same width. Further, the flexible paper-like material 12 is made of a flexible material having insulation properties, such as non-woven fabric or paper,
It is formed into a tape shape having approximately the same width as the width between the inner walls of the molded bobbin 1 shown in FIG. Then, these resin films 11 and flexible paper-like materials 1
2 in a multi-layered manner, for example, as shown in FIG.
Place 2 inside them and overlap them. Here, the arrangement of the resin film 11 and the flexible paper-like material 12 may be completely reversed from the above. Also, the number of each piece may be one or more,
The windings may be overlaid as appropriate so that the thickness is sufficient to insulate the windings from each other.

A shielding material 13 is assembled between any one of the multilayered resin films 11, 11 and flexible paper-like materials 12, 12. This shield material 13 is for electrostatic shielding between the primary winding 2 and the secondary winding 7, and as shown in FIG. Tape-shaped copper foil 14 having a width
is formed by wrapping at least one side of it with a thin resin film 15. To wrap it, the resin film 15 is made slightly wider than the copper foil 14, and both sides thereof are folded inward, and the folded parts 16, 1
6 may be engaged with and wrapped in the copper foil 14. Note that the folded portions 16, 16 may be partially temporarily fixed 17 by thermocompression bonding or the like. Further, in FIG. 6, reference numeral 18 is a lead wire for grounding the copper foil 14.

As shown in FIG.
are partially attached to each other by high-frequency heating or thermocompression bonding, etc., and are integrated. Note that the portions that are fixed to each other are not limited to the above-mentioned one side end portion, and may be any portion.

The resin film 11, the flexible paper-like material 12, and the shielding material 1 are superimposed and fixed in a multi-layered manner in this way.
The composite material No. 3 has a length l (5th
(see figure). In this way, the length l at which both ends overlap is determined by the above-mentioned primary winding 2.
This is because the overlapping portion (see reference numeral 20 in FIG. 7) is wrapped around the outer periphery of the sheet and then adhesively bonded by applying adhesive glue.

Composite insulation shield 10 configured as above
In order to insulate between the windings of a transformer and to provide electrostatic shielding using
A resin film 1 is shaped so as to wrap around the outer circumference of the primary winding 2 wound around the lower layer of the molded bobbin 1 shown in the figure.
1 is deformed in advance, the overlapping portions 20 at both ends of this composite insulating shield 10 are opened, and the composite insulation shield 10 is wound only once so as to be fitted onto the outer peripheral surface of the primary winding 2 in a one-touch manner as shown in FIG. , the overlapped portions 20 at both ends may be adhesively bonded using adhesive glue.
As shown in FIG. 9, the secondary winding 7
Wrap around. Here, the above composite insulating shield 1
0 is made by laminating a resin film 11 and a flexible paper-like material 12 in a multi-layered manner, so that sufficient insulation thickness can be obtained even with just one turn, and a shielding material 13 is combined between the layers. Therefore, electrostatic shielding measures can be taken at the same time. Note that the resin film 11 is not limited to one that is deformed in advance as shown in FIG. 7, but a tape-shaped film as shown in FIG. 5 may be wrapped as it is around the outer peripheral surface of the primary winding 2. Of course.

Note that the resin film 11 and the flexible paper-like material 12
The overlapping and mutual fixing of and the shielding material 13 are as follows:
For example, the length of the resin film 11 is not limited to that shown in FIG. 5, and the resin film 11 is made approximately twice as long, folded in half at the center, and the flexible paper-like material 12 and the shield material 13 are arranged inside it. The folded parts may be fixed to each other by high frequency heating or the like. In addition, as another example, the width of the resin film 11 is approximately doubled,
The flexible paper-like material 12 and the shield material 13 may be placed inside of the folded paper by vertically folding it in half along its longitudinal center line, and may be fixed to each other by thermocompression bonding or the like at the folded portion.

Effects of the Invention As explained above, the present invention provides a resin film 1.
one or more sheets of 1 and an insulating flexible paper-like material 12
Since one or more sheets are stacked in a multi-layered manner and the shielding material 13 is combined between these layers, the thickness is such that sufficient dielectric strength can be guaranteed by simply wrapping the material once around the outer circumferential surface of the primary winding 2. At the same time, it is possible to provide electrostatic shielding between the windings. Therefore, it is not necessary to wrap the insulating tape 5 over the primary winding 2 many times as in the past, and there is no need to separately wrap the copper foil 6, which reduces the number of steps and reduces the number of steps. Make your work easier
Transformer productivity can be improved. Also,
The widths of the resin film 11, flexible paper-like material 12, and shielding material 13 are approximately the same as the width of the molded bobbin 1, and the widths do not decrease or become uneven due to multiple windings, as shown in FIG. like,
Insulating shield 1 between primary winding 2 and secondary winding 7
There is no gap of 0, and the insulation between the windings can be made good, and electrostatic shielding can be made perfect. Furthermore, since the resin film 11, the flexible paper-like material 12, and the shielding material 13 are stacked in a multi-layered manner and the resulting thick layer is simply wound once, there is no unevenness on the wrapping surface, and the secondary winding 7 can be wrapped around Saiichi to clean the finish of the transformer.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of a main part showing a conventional insulating tape wrapped around the outer circumferential surface of the primary winding, Figure 2 is a perspective view of the conventional insulating tape, and Figure 3 is a diagram showing how the insulating tape is wrapped around the primary winding. FIG. 4 is a cross-sectional view of main parts showing a state in which windings are insulated and electrostatically shielded using conventional insulating tape and copper foil, and FIG. An assembled perspective view showing the insulating shield, Fig. 6 is a perspective view showing the shield material, Fig. 7 is a perspective view showing the shape before winding around the primary winding, and Fig. 8 shows the primary winding in the lower layer of the molded bobbin. FIG. 9 is a perspective view showing a state in which the windings are wound, and FIG. 9 is a sectional view of a main part showing a state in which the windings are insulated and electrostatically shielded from each other. DESCRIPTION OF SYMBOLS 1... Molded bobbin, 2... Primary winding, 7... Secondary winding, 10... Insulating shield, 11... Resin film, 12... Flexible paper-like material, 13... Shielding material, 14... ...Copper foil, 15...Resin film, 18
... Lead wire, 19 ... One side end, 20 ... Overlapping part.

Claims (1)

[Claims] 1 One or more resin films having approximately the same width as the width of the molded bobbin of a transformer in which the primary winding and the secondary winding are arranged concentrically using a molded bobbin; Insulating flexible paper-like material having a multi-layer structure, and at least one side of the resin film and the flexible paper-like material having substantially the same width between the resin film and the flexible paper-like material. The wrapped shielding material is combined, and the resin film, flexible paper-like material, and shielding material are partially fixed to each other at appropriate locations, and wrapped one or more times around the outer peripheral surface of the winding portion to be insulated. A composite insulating shield for a transformer, characterized in that it is cut to a length where both ends overlap.