JPS58268Y2 - flyback transformer - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a flyback transformer used in television receivers and the like.

In flyback transformers, high voltage is used, so resin fillers are used to insulate and withstand pressure to prevent corona discharge into the transformer and to prevent discharge between other metals and electronic components. There is.

The filler is filled during manufacturing into an insulating case that houses the primary coil, secondary coil, etc., and hardens after penetrating between parts and between windings, producing the insulation and pressure-resistant effects described above. It also serves to fix each part.

The flyback transformer has a core, and when filling with the filler, a core mounting part must be provided and buttoned in advance.

However, in the conventional method, the liquid being filled may flow into the set core mounting portion, and it takes time and effort to remove unnecessary portions after curing.

Furthermore, it may become impossible to mount a core if the core mount portion is completely buried.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a flyback transformer that is easy to assemble and can improve operational reliability.

An embodiment of the present invention will be described in detail below with reference to FIGS. 1 and 2.

That is, in FIG. 1, numeral 11 is a low-voltage bobbin provided with a low-voltage coil (minus-order winding).

This low pressure bobbin 11 has a cylindrical shape and has a flange 12 integrally formed at one end.

Further, the collar portion 12 is provided with a plurality of terminals 13□, 13°, . . . that protrude in the axial direction on a suitable circumference.

Additionally, a core mounting portion 14 is integrally formed on the end portion of the low-pressure bobbin 11 on the side of the collar portion 12 .

This core mounting portion 14 extends in a direction perpendicular to the bobbin axial direction.

One end on the bobbin side communicates with the hollow of the low pressure bobbin 11, and the other end protrudes in the radial direction so as to form a groove 15.

A wall 16 is integrally formed at the protruding end of the core mounting groove 15 so as to partition the groove.

However, so that the wall 16 can be easily cut out and removed from the groove 15, the connecting portion with the groove wall is formed with an appropriate thickness.

Further, the bottom shape of the groove 15 is set to match the core to be installed there.

The above-described low-voltage bobbin 11 is inserted into the hollow of the high-voltage bobbin 17 after the low-voltage coil is wound thereon.

The high-voltage bobbin 17 is, for example, a cylindrical body with a plurality of flanges formed on the outer periphery for dividing winding, and a high-voltage coil (secondary winding) is wound thereon.

When the high-pressure bobbin 17 and the low-pressure bobbin/11 are integrated, they are inserted into a cylindrical insulating bottomed case 18.

The case 18 is integrally formed with a core lead-out portion 19 that corresponds to and has a substantially similar shape to the core attachment portion 14 at the open end thereof.

Therefore, this core lead-out portion 19 also has a wall 21 formed at the protruding tip of the groove 20 .

When the core attachment part 14 and the core lead-out part 19 are overlapped, the walls 16 and 21 are formed in such a position that they come into close contact with each other.

Further, the side walls of the grooves 15 and 20 are also formed in close contact with each other.

After the windings are provided on each bobbin and housed in the case 18, and the windings are led out through the terminals 13□, 13°, etc., the filler 22 is installed as shown in FIG. is case 1
8 is filled.

This filler 22 is impregnated between the parts in the case, and is molded into the internal shape of the case and hardened.

In order to perform the filling operation with the filler 22, according to the present invention, a core mounting part 14 and a core lead-out part 19 are formed in the low-pressure bobbin 11 and the case 18, respectively.

In addition, walls 16 and 21 are formed in advance on the protruding tips of the core mounting portion 14 and the core lead-out portion 19, respectively.

As a result, the groove 15 of the core mounting portion 14 and the low pressure bobbin 11
There is no filler mixed into the hollow space, and the shape remains accurate.

Therefore, when installing the core 23, the wall 16.21 is removed.

When one leg 23□ of the substantially U-shaped core 23 is inserted into the hollow of the low pressure bobbin 11, one bent portion of the core 23 connects with the hollow of the low pressure bobbin 11 and the core mounting portion 1.
Matches near the connection part of 5.

Further, a connecting portion 233 that integrally connects the leg portions 23□ and 23° of the core 23 is fitted into the core mounting portion 14.

A core similar to the core 23 is further attached to the other hollow end of the low-pressure bobbin 11, and both cores are integrated with a metal fitting or the like to form a flyback transformer.

According to the flyback transformer of the present invention described above, in order to accurately form the shape of the mounting part for mounting the core, the walls 16 and 21 are formed in advance in the groove 15 of the core mounting part 14 and the groove of the core lead-out part 19. It is set up.

Therefore, the flow of the filler is completely prevented during filling, and the above objective can be achieved.

Therefore, the work when attaching the core becomes easy, and since there is no mixed filler, there is no need to take the trouble of removing it.

Furthermore, if the mixed filler is removed, the necessary parts may be scraped off, making it impossible to achieve the purpose of pressure resistance or anti-electricity protection.According to the present invention, accidents caused by such a causal relationship can be prevented.

Furthermore, the relationship in which the core mounting portion 14 of the low-pressure bobbin 11 and the core lead-out portion 19 of the case are in close contact with each other is effective for positioning the bobbin within the case during assembly.
6.21 is effective for positioning in the radial direction, and the side wall of the groove 15.20 is effective for positioning in the rotation angle direction.

It is also effective in preventing misalignment of the bobbin during filler filling work.

As described above, the present invention can provide a flyback transformer that is easy to assemble and has improved operational reliability.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of parts of a flyback transformer according to an embodiment of the present invention, and FIG. 2 is a perspective view showing the assembled state of FIG. 1. 11...Low pressure bobbin, 14...Core attachment part, 15...Groove, 16...Wall, 17
...High pressure bobbin, 18...Case, 1
9...Core lead-out portion, 20...Groove, 21
...Wall, 22...Filler, 23...
···core.

Claims (1)

[Scope of utility model registration request] In a flyback transformer in which a U-shaped core leg is inserted into a core insertion hole of a low-pressure bobbin, the core is installed in a direction perpendicular to the extending direction of the insertion hole so that one end side of the core insertion hole has a continuous groove. A section is formed integrally with the low-pressure bobbin, a wall section is formed at the tip of the groove to partition a wire groove, the low-pressure bobbin is housed in a case, and an insulating resin is injected between the low-pressure bobbin and the case. The flyback transformer O is characterized in that the insulating resin is configured to prevent the insulating resin from leaking into the groove portion when the core is installed in the core device portion with the wall portion removed.