JPS638086Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a coil bobbin for a high voltage transformer, such as a pulse transformer.

[Technical background of the invention]

Generally, in a transformer, as a means for fixing an external lead wire to a coil bobbin, an adhesive tape is wound around the coil bobbin, and the external lead wire on the coil bobbin is fixed using the adhesive tape.

[Problems with background technology]

However, when adhesive tape is used, voids remain between the tape and the adhesive tape, and there is also the problem of outgassing, which occurs when the adhesive is heated to a high temperature by the heat generated during transformer operation, causing gas to be generated from the adhesive. Therefore, it is not recommended to use such a product in a high voltage transformer.

[Purpose of invention]

The present invention attempts to fix the external lead wire to prevent it from coming off by devising the coil bobbin itself.

[Summary of the idea]

The structure of the present invention is that a first flange and a second flange are integrally molded at the end of the same side of the winding drum with a space between them, and the first flange and the second flange have the same shape. This relates to the structure of the coil bobbin, which is characterized by having holes with a slightly larger diameter than the external lead wire for inserting the external lead wire, which are eccentric to each other. By inserting the lead wire, the external lead wire is forcibly bent to prevent it from coming off against external tensile force.

[Example of idea]

Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings.

As shown in FIG. 1, EC type iron cores 2 and 3 are fitted onto a coil bobbin 1 according to the present invention, and the iron cores 2,
By winding a beryllium copper band 7 from the outer circumferential surface of the holder 3 to the lower surface of the holder 4 through the band insertion holes 5 and 6 of the holder 4, and fixing the band 7 with a buckle (not shown), The formed high voltage transformer is fixed to the pedestal 4. The coil bobbin 1 is a primary bobbin 1 as an inner bobbin.
1 and a secondary bobbin 12 as an outer bobbin are fitted inside and outside. 13 is a primary side external lead wire connected to the primary coil wound on the primary bobbin 11; for example, a polyimide-treated Teflon-coated wire is used; This is an external lead wire on the secondary side connected to the secondary coil, and uses, for example, a silicon-coated wire with high withstand voltage. The opposing parts 15 of the left and right legs of the EC type iron cores 2 and 3 are fixed with adhesive, and the pedestal 4
A plurality of eyelets 16 are attached with adhesive, and the eyelet 1 on the side without the primary external lead wire 13 is
A ground wire 17 is connected between 6a and the band 7 by soldering.

As shown in FIG. 2, the primary bobbin 11 is integrally formed with a flange 23 having a plurality of holes 22 for passing the external lead wires 13 through the right end of the winding drum 21, and further has a flange 23 formed around the outer periphery of the winding drum 21. Discontinuous protrusions 27 and 28 are integrally molded on the surface to separate the coil-wound part 24 at the center and the non-wound parts 25 and 26 at both ends. A primary coil 29 is wound thereon. This primary coil 29
The winding width is determined by the distance between the protrusions 27 and 28 on both sides. Further, the secondary bobbin 12 has a first flange 32 and a second flange 3 at the left end of the winding drum 31.
3 are integrally molded with a parallel gap 34 in between, and each flange 32, 33 is provided with a plurality of holes 35, 36 having a slightly larger diameter than the external lead wire 14, through which the external lead wire 14 is inserted. Furthermore, the winding drum 31
A coil for winding a secondary coil 38 as an outer coil between the large diameter portion 37 and the second flange 33 is formed by forming a large diameter portion 37 whose inner and outer diameters are enlarged at the right end of the coil. A winding recess 39 is provided. The coil winding recess 39 is divided into two parts by an intermediate flange 40, and a pin 41 for connecting the secondary coil 38 and the external lead wire 14 is protruded from the circumferential surface of the intermediate flange 40. . Furthermore, since the large diameter portion 37 is the end of the winding drum 31 of the secondary bobbin 12 that engages with the flange 23 of the primary bobbin 11, there are cutouts for air venting at two opposing locations in the large diameter portion 37. A concave groove 42 is provided in a semicircular shape.

As shown in FIG. 3, the primary coil 29 wound around the coil winding part 24 of the primary bobbin 11 passes through the discontinuous space 45 provided between the upper protrusions 28a to the non-winding part. 26, and in this non-wound part 26, the external lead wire 13 drawn onto the non-wound part 26 through the hole 22 of the flange 23 and the lead wire 46 of this primary coil 29 are connected and soldered. do. This soldered part 47 is insulated by fitting an insulating tube 48,
Further, with the lead wire 46 and the external lead wire 13 bent in a meandering manner on the circumferential surface of the non-wrapped portion 26,
By tightening the meandering portion to the surface of the non-wound portion 26 using the insulating string 49 wound around the non-wound portion 26, the lead wire 46 of the primary coil 29 and the external lead wire 13 are connected to the primary coil 29. Fix it to the bobbin 11. Conventionally, in such cases, a method of fixing the connection part with adhesive tape instead of the string 49 has been used, but the adhesive tape leaves voids between the adhesive tape and the part to be adhered, and the adhesive tape There is a problem of outgassing in which gas is generated when the adhesive is heated to a high temperature during operation.

As shown in FIG. 4, the pin 41 of the intermediate flange 40 of the secondary bobbin 12
The lead wire 52 of the secondary coil 38 is fixed by press-fitting into a small hole 51 provided on the circumferential surface of the pin 41.
and the core wire 53 of the external lead wire 14 are wound together and fixed by soldering. In the case of FIG. 4, the lead wire 52 and the core wire 53 have just been wound around the pin 41, and although the unwrapped portion 54 of the pin 41 is largely protruding, this unwound portion 54 is cut and removed after soldering.

As shown in FIG. 5, in the secondary bobbin 12, the first, second and intermediate flanges 32, 33,
40 is formed to have a constant width, and the first flange 3
A pair of protrusions 57 for fitting the iron core are integrally formed to protrude on the outer surface of 2, and an iron core fitting groove 58 is formed between the pair of protrusions 57. An arcuate groove 59 for penetrating the filler is provided at the same diameter as the inner diameter of the winding drum 31. Further, an iron core fitting groove 60 is formed in the flange 23 of the primary bobbin 11 in the same direction as the iron core fitting groove 58. Further, as shown in FIG. 5, the upper protrusions 27a, 28a and the lower protrusions 27b, 28 of the primary bobbin 11
A large discontinuous interval 61, 62 is provided between the secondary bobbin 12 and the secondary bobbin 12 at substantially the same phase as the interval 61, 62.

As shown in FIG. 6, the holes 35 and 36 for passing the external lead wires provided in the first flange 32 and the second flange 33 of the secondary bobbin 12 are eccentric to each other in the lower and upper stages. Therefore, when the external lead wire 14 is forcibly bent by inserting the external lead wire 14 into the holes 35 and 36 as shown in FIG. The wire 14 is engaged with the holes 35 and 36, and becomes difficult to come off against external tensile force. In particular, the opening edges 66, 67, 68 other than the outer opening edge 65 of the hole 35 of the first flange 32 are formed at right angles without dropping the edges. By locking the wire 14 and using a silicone coated wire with a wire diameter of about 3 mm as the external lead wire 14, a sufficient elastic restoring force against bending is exerted, so that the external lead wire 14 can be reliably prevented from coming off. Further, as is clear from FIG. 6, the outer diameter of the protrusions 27, 28 of the primary bobbin 11 and the inner diameter of the winding drum 31 of the secondary bobbin 12 are formed to be approximately equal, and when these are fitted, the Next bobbin 11
The protrusions 27 and 28 are connected to the winding drum 31 of the secondary bobbin 12.
to prevent looseness between the bobbins 11 and 12, and to maintain a uniform distance between the primary coil 29 and the secondary coil 38. The provided external lead wire insertion hole 22 is formed so as to face the inner space of the large diameter portion 37 of the secondary bobbin 12 so that there is no problem in drawing out the external lead wire 13 of the primary coil 29. do.

As shown in FIG. 7, the large-diameter portion 37 of the secondary bobbin 12 is formed to have a slightly larger diameter than the width of the flanges 32, 33, and 40, and as shown in FIG. The protrusion 28a and the lower protrusion 28b are formed on the outer circumferential surface of the winding drum 21 over an approximately 90° range, with discontinuous intervals 6 on both sides between them.
2 is also formed over an approximately 90° range, and a number of holes 22 for inserting lead wires are provided in a corresponding number to the discontinuous spaces 45 of the upper projection 28a.

Then, as shown in Fig. 1, the primary bobbin 1
1, secondary bobbin 12, and iron cores 2 and 3, this transformer is immersed upside down in a vacuum tank containing a filler such as a range, and vacuum impregnation is performed. The filler is iron core 3
It penetrates into the winding drum 31 of the secondary bobbin 12 from the gap 71 between the and the arc-shaped concave groove 59, and furthermore, in FIG.
2. The discontinuous spacing 61 between the protrusions 27, the spacing 73 on the surface of the primary coil 29, the discontinuous spacing 62 between the protrusions 28, and the spacing 74 on the surface of the non-wound portion 26 are sequentially penetrated into these spaces. Fill in the internal gap. At that time, the air in this internal space is drawn from the notch-shaped groove 42 to the iron core 2.
Since the air is evacuated to the outside through the gap 75 (shown in FIG. 1) between the curved surfaces of the bobbins 11 and 12, the filler can penetrate smoothly and reliably.

As shown in FIG. 9, the outer peripheral surface of the non-winding portion 26 of the winding drum 21 of the primary bobbin 11 and the secondary bobbin 12
Since a sufficient space 74 is secured between the inner peripheral surface of the large diameter portion 37 of the winding drum 31, the inner and outer winding drums 2
A connecting portion between the lead wire 46 of the primary coil 29 and the external lead wire 13 shown in FIG. Further, as shown in FIG. 9, unwound portions 25 and 26 on both sides are shown between the primary coil 29 and the secondary coil 38 and the iron cores 2 and 3.
Sufficient insulation distance and creepage distance can be secured through this.

Note that the coil winding recess 39 of the secondary bobbin 12
2 between the second flange 33 and the large diameter portion 37
The holes 35 and 36 of the flanges 32 and 33 for passing the external lead wires may be formed into three or more sections through three or more intermediate flanges.
It may also be provided on the opposite side.

[Effect of idea]

According to the present invention, two flanges are molded with a gap between them, instead of being integrally molded into one piece.
Since holes with a slightly larger diameter than the external lead wire for passing the same external lead wire through each flange are provided eccentrically from each other, the external lead wire inserted through both holes is forcibly bent. As a result, the external lead wire is pressed against the corner of the hole opening by its own elastic restoring force, and does not shift in this hole even if pulled from the outside, and has a simple structure and effective prevention effect. The operation is easy because the external leads only need to be inserted through two holes. Since the external lead wires can be fixed in this way without using adhesive tape, there is no problem of outgassing in which the adhesive of the adhesive tape generates gas due to heat generated during voltage changing operation.

[Brief explanation of the drawing]

The figures relate to one embodiment of the coil bobbin of the present invention. Fig. 1 is a perspective view of a transformer using the coil bobbin, Fig. 2 is an exploded cross-sectional view of the inner and outer bobbin with a coil wound thereon, and Fig. 3 is an exploded cross-sectional view of the coil bobbin. FIG. 4 is an enlarged sectional view of the coil-wound portion of the outer bobbin, FIG. 5 is an exploded perspective view of the inner and outer bobbins, and FIG. 6 is an exploded sectional view of the inner and outer bobbins.
FIG. 7 is a plan view of the outer bobbin, FIG. 8 is a sectional view of the inner bobbin, and FIG. 9 is a sectional view of the assembled inner and outer bobbins. 31... Winding drum, 32, 33... Flange, 34
... Between, 35, 36... hole.

Claims (1)

[Scope of utility model registration request] A first flange and a second flange are integrally molded at the ends of the same side of the winding drum with a space between them, and the same external lead wire is inserted through the first flange and the second flange. A coil bobbin characterized by having holes with a slightly larger diameter than the external lead wire arranged eccentrically from each other.