JPS582035Y2 - bobbin wound transformer - Google Patents

Description

[Detailed description of the invention] The present invention relates to a bobbin-wound transformer, and in particular, a bobbin for winding a secondary coil and a secondary coil is provided independently and freely assembled, and the secondary coil, secondary coil, and iron core are provided. The present invention relates to a bobbin-wound transformer in which a creepage distance between each part is maintained at a certain dimension or more.

The conventionally well-known inner iron type and outer iron type transformers are
Insulating paper is wrapped around the inner and outer circumferential surfaces of the coil, and insulating tape is wound so as to overlap the insulating paper in order to ensure insulation from the coil.

The insulating tape was then covered with insulating paper again, or a coil was wrapped around the tape without the insulating paper.

However, when assembling such a transformer, uniformly wrapping the insulating tape is extremely troublesome due to the basic structure of the core, causing irregularities in the coils, and requiring skill in the winding work. However, it had the disadvantage of poor workability.

Furthermore, in conventional transformers, the creepage distance between the primary coil, secondary coil, and iron core is extremely short, and the magnetic flux generated in the primary coil and secondary coil is mutually transmitted to the other coils. In some cases, the current may sink in and cancel the current flowing through each coil, or it may leak through metal fittings near the transformer and leak into other magnetic circuits.

In addition, in a bobbin-wound transformer, this effect is not affected between the secondary coil and the iron core or other metal members, between the secondary coil and the secondary coil, and between the secondary coil and the iron core or other metal members. It was easy.

The present invention was created in view of the drawbacks of the conventional technology.
In particular, the present invention proposes a novel bobbin-wound transformer in which the above-mentioned creepage distance is set to a certain dimension or more to avoid the influence of magnetic flux leakage.

An embodiment of the present invention will be specifically described below with reference to the drawings.

Fig. 1 is a longitudinal cross-sectional view showing details of the bobbin-wound transformer according to the present invention, in which 1 is a primary bobbin made of a cylindrical body 2 with flanges 3 formed at both ends, and is made of an insulating material such as synthetic resin. Therefore, it is integrally molded.

An annular notch 4 is provided on the circumferential surface of the flange 3, and of the two annular ribs 5 and 6 formed by this, the outer annular rib 5 is larger than the inner annular rib 6, which will be described later. The height is equal to the thickness of the

On the circumferential surface of the cylindrical body 2 between the annular ribs 6, -
Next, a large number of coils 7 are wound so as to be superimposed with or without insulating paper, and the height of the coils 7 almost corresponds to the height of the annular rib 6, and the cross section is C-shaped toward the top of the coil 7. It is covered with an insulating cover 8 made of synthetic resin and having a shape.

At this time, the side bent pieces 9, 10 of the insulating cover 8 are fitted into the annular notch 4.

On the outer periphery of the thus formed winding block of the primary coil 7, an air-core winding block of the secondary coil 12 wound together with a large number of insulating papers 11 is fitted as shown.

This winding block forms the secondary side portion of the transformer by fitting the secondary coil 12, which has a bobbin and is formed into a predetermined annular body with interlayer insulation, around the insulating cover 8. However, the secondary coil 12 may be directly wound on the insulating cover 8 while providing interlayer insulation.

Therefore, the primary and secondary winding blocks obtained in this manner are housed integrally within the iron core 13.

Note that 14a is a yoke insulator interposed between the winding end surface of the secondary coil 12 and the iron core, and is made of synthetic resin or the like with good insulation properties.

According to the bobbin-wound transformer having such a configuration, the creepage distance between the primary coil 7 and the iron core 13 can be ensured to be extremely large due to the provision of the annular notch 4, and similarly, the creepage distance between the primary coil 7 and the secondary coil 7 can be maintained extremely large. Sufficient creepage distance between the secondary coils 12 is also ensured.

Further, the yoke insulator 14a is interposed between the secondary coil 12 and the iron core 13, and by arbitrarily selecting the shape of this yoke/insulator 14a in accordance with the shape of the winding fill, these A sufficient creepage distance between the coils 7.12 is ensured, and the magnetic flux generated in each coil 7.12 flows into the other, canceling out the current flowing in each coil 7.12.
Accidents such as overlapping with each other or transmission through metal fittings near this transformer and adversely affecting other magnetic circuits can be prevented.

FIG. 2 shows still another embodiment of the bobbin-wound transformer according to the present invention.

This is equipped with a winding block similar to that shown in FIG. 1 in which an annular notch 4 and annular ribs 5 and 6 are provided on the next bobbin 1, and a double-layer curved piece of an insulating cover 8 is provided in the annular notch 4. 9,1
It has the same configuration as that in FIG. 1 in terms of fitting 0.

However, the difference from FIG. 1 is that the secondary coil is not directly wound around the circumferential surface of the insulating cover 8 or the coil wrapping body is fitted, but the insulating cover 8 is almost connected to the insulating cover 8. The secondary coil is fitted onto the insulating cover 8 via a secondary bobbin 20 having a similar shape.

That is, the secondary bobbin 20 is made of an annular body with a U-shaped cross section or a ring-shaped body formed by continuously separating separate parts, and flanges 21 and 22 are provided at the ends of the annular body. The secondary coil 23 and the iron core 13 are integrally formed so as to be completely insulated.

In order to ensure that the secondary bobbin 20 is fitted to the primary bobbin 1, the inner surface of the secondary bobbin 20 is provided with:
Annular ribs 24 and 25 having a size and shape suitable for the flange 3 of the next-side bobbin 1 can be provided.

Even with the bobbin-wound transformer having such a configuration, the secondary coil 7, the secondary coil 23, and the iron core 13 are reliably insulated from each other.

As described above, the present invention includes a primary bobbin in which a primary coil is wound between flanges, a notch provided on the circumferential surface of the flange, and a bent piece fitted into the notch, and the above-described - an insulating cover connected to the next bobbin so as to cover the next coil; a secondary coil wound around the circumferential surface of the insulating cover;
By providing an iron core that accommodates a winding body containing both of these coils, the use of insulating tape or insulating paper can be largely omitted, and the next coil can be moved with just the bobbin or with the insulating paper.
With a sufficiently large creepage distance between the secondary coil and the core, a transformer with good magnetic properties such as magnetic conversion efficiency can be obtained at low cost through simple and reliable assembly.
Therefore, it is very useful in practical use.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a longitudinal sectional view showing one embodiment of a bobbin-wound transformer, and FIG. 2 is a longitudinal sectional view showing another embodiment. 1...-Next bobbin, 3...Flange, 4...Notch, 7...-Next coil, 8
...Insulation cover, 9.10...Bending piece, 12.23...Secondary coil, 13...
・Iron core, 20... Secondary bobbin, 24.25.
...Annular rib.

Claims (1)

[Scope of utility model registration request] It has a primary side bobbin in which a part of the coil is wound between the flanges, a notch provided on the circumferential surface of the flange, and a bent piece fitted into the notch, and the above-mentioned -next coil is arranged so as to cover the above-mentioned -next coil. A bobbin-wound transformer comprising an insulating cover connected to a side bobbin, a secondary coil wound around the circumferential surface of the insulating cover, and an iron core accommodating a winding body containing both of these coils. .