JPH0625940Y2 - High voltage transformer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention wraps a metal plate with both ends joined to the outer circumference of a coil inserted in a magnetic core, and a short circuit for preventing the magnetic flux leaking from the magnetic core from affecting the outside. The present invention relates to a high-voltage transformer provided with a ring, and particularly in a high-voltage transformer, an attempt is made to improve the effect of the short ring without impairing the insulating property.

2. Description of the Related Art As a conventional transformer with a short ring, coils consisting of coil bobbins 1 and 2 having windings 6 as shown in FIGS. 6 to 8 are inserted into a transformer case 3 and an insulator 4 is cast. Leakage flux leaking from the magnetic core 5 by incorporating magnetic cores 5 such as EI type or UU type ferrites, laminates and cut cores, and fitting a short ring 8 made of a copper plate with both ends joined by soldering 7 etc. Were made to interlink with each other and a current was passed through the short ring 8 so that there was no influence of leakage flux to the outside of the transformer.

Problems to be Solved by the Invention The short ring 8 having such a structure is used in a high voltage transformer in which a high voltage is induced in a transformer coil.
When the short ring 8 is wound close to the coil, it is necessary to provide a distance between the transformer case 3 and the short ring 8 for insulation, which complicates the structure. Further, the magnetic leg of the magnetic core 5 in which the coil is not wound is located outside the transformer case 3 and a space is formed between the magnetic core 5 and the transformer case 3 so that corona discharge is likely to occur. Therefore, a sufficient distance is maintained between them. However, there is a drawback that the short ring 8 becomes large in order to secure a safe insulation distance.

Means for Solving the Problems The present invention solves such problems, in which a coil composed of a coil bobbin is arranged inside a transformer case for casting an insulating agent, and the coil is arranged along the inner surface of the case. Place the short ring, place the tongue of the short ring on the surface of the coil that faces the magnetic core, and also provide the tongue on the high-voltage side of the high-voltage coil. Is a transformer.

Function With this configuration, the leakage flux of the transformer is linked to reduce the flux leaking to the outside of the transformer, and the electric field between the magnetic core and the high-voltage coil is reduced to zero by the tongue of the short ring. It is possible to bring them closer to each other, the size of the transformer can be made smaller, and because the insulating agent is cast between the coil of the high voltage transformer and the tongue of the short ring, the tongue of the short ring and the tongue of the high voltage transformer are Corona discharge does not occur between the coils, insulation is secured, and a short ring effect can be expected.

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

In FIG. 1, 10 is a magnetic core made of UU type ferrite, laminate or cut core, and its main magnetic leg 10a.
A primary coil bobbin 12 and a secondary coil bobbin 13 each having a winding 11 provided therein are inserted to form a transformer. Reference numeral 14 denotes a case in which an insulating agent is cast. As shown in FIGS. 2 and 3, a through hole 14a having a main magnetic leg 10a of the magnetic core 10 and a side wall 14c having a side magnetic leg 10b is formed. It is provided. Reference numeral 15 is a short ring arranged on the inner surface of the case 14, and as shown in FIG. 4, a metal plate having a small volume resistance such as copper is bent in a frame shape to provide a soldered portion 15a, and leakage flux from the transformer is chained. The current is passed through and consumed. Inside the short ring 15, there is provided a tongue piece 15b which is formed by extending one end portion of the metal plate so as to project inwardly in parallel with both end portions. Further, the surface facing the high voltage side of the high voltage coil is perpendicular to the tongue piece 15b. Bottom bottom tongue 15c
Is provided.

FIG. 5 is a cross-sectional top view of the case 14 and the short ring 15 combined with a transformer. After the combination, the insulating agent 16 is cast.

The cast insulating mold 16 is filled in the case 14 and also includes the short ring 15. Therefore, the inside of the case 14 is filled with the cast insulating agent 16.

Therefore, even if the secondary coil has a high voltage, air does not exist between the secondary coil and the short ring 15, so that corona discharge does not occur and the insulation is maintained even if the short ring 15 is grounded.

Further, since the tongue piece 15b of the short ring 15 made of a metal plate grounded also exists on the side magnetic leg 10b of the magnetic core 10 through the insulating agent 16, the potential from the secondary coil is the tongue piece 15b of the short ring 15. Side magnetic leg 1 by grounding with
Since 0b can be brought close to the high voltage coil, magnetic core 1
The size of 0 can be reduced.

Further, the tongue piece 15c on the bottom side of the short ring 15 is 2
Since it is also arranged on the high voltage side of the secondary coil bobbin 13 via the insulating agent 16, the magnetic core 10 and the secondary coil high voltage side can be brought close to each other, and the size can be reduced.

Effect of the Invention As described above, according to the present invention, the influence of the flux leaking from the transformer on the outside can be reduced, and the short rings can be arranged close to each other even in the case of a high voltage transformer, so that the short ring effect is increased. You can
Moreover, it is of great industrial value that it is possible to realize a high-voltage transformer that is compact and has a low leakage flux without raising the potential of the magnetic core.

[Brief description of drawings]

1 is a side sectional view of a high voltage transformer according to an embodiment of the present invention, FIG. 2 is a top view of a case, FIG. 3 is a front view of the same, and FIG.
Fig. 5 is an external view of the short ring, Fig. 5 is a cross-sectional top view in which a high-voltage transformer is placed in a case, and is filled with an insulating agent. Fig. 6 is a front view of a conventional high-voltage transformer. Fig. 7 is a bottom view of the same. 8
The figure is a perspective view of the short ring. 10 ... Magnetic core, 11 ... Winding, 12 ... Primary coil bobbin, 13 ... Secondary coil bobbin, 14 ... Case, 14
a, 14b ... through hole, 15 ... short ring, 15
b, 15c ... tongue piece, 16 ... insulating agent.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshio Morimura 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References

Claims (1)

[Scope of utility model registration request] 1. A case provided with a through hole for inserting a main magnetic leg of a magnetic core and a through hole having a side wall for inserting a side magnetic leg, and a tongue piece located between the side magnetic leg of the magnetic core and the secondary coil. A primary and secondary coil bobbins in which a short ring having a tongue piece provided also on the high voltage side of the secondary coil is arranged on the inner surface of the case and a primary winding and a secondary winding into which the main magnetic leg of the magnetic core is fitted are wound. A high-voltage transformer that is built by casting an insulating agent in this case.