JPH0897046A - Wound iron core transformer and manufacture thereof - Google Patents

Abstract

PURPOSE: To prevent the fragments of an iron core from getting out of a transformer after a wound iron core transformer is manufactured by a method wherein a pair of yokes of an iron core protruding from the axial end faces of a winding are wrapped up in a broad and long insulating member previously arranged on a winding side. CONSTITUTION: Insulating members 12 and 13 large enough in size to cover the axial end face of a winding 9 and provided with window holes 15 each as large in size as an iron core insertion hole h of the winding 9 are provided to both sides of the iron core insertion hole h of the winding 9. A flange edge provided to the peripheral edge of the window hole 15 is fixed to the iron core insertion hole h of the winding 9, and the insulating members 12 and 13 are attached to the winding 9. Furthermore, the insulating members 12 and 13 are folded over the outer surface of the winding 9, a wound iron core 1 is separated into two U-shaped pieces, the legs of a U-shaped piece are fitted into the iron core insertion holes h of the winding 9, and the two U-shaped pieces are reassembled into the wound iron core 1 shaped like a racetrack. Thereafter, the insulating members 12 and 13 are unfolded back to cover the yokes f and f1 of the wound iron core 1 which protrude outwards from the winding 9. By this setup, the fragments of an iron core are surely prevented from getting out of a transformer of this constitution.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a winding core transformer using a one-turn cut type winding core made of an amorphous magnetic alloy ribbon and a manufacturing method thereof. Is to provide a wound-core transformer in which, for example, the fragments do not enter the winding and cause dielectric breakdown.

[0002]

2. Description of the Related Art In recent years, various transformer iron cores for use in distribution transformers and the like have been developed which use amorphous magnetic alloy ribbons (hereinafter simply referred to as magnetic ribbons) as core materials. This magnetic ribbon is manufactured by ultra-quenching a melt of a magnetic alloy and has a very small iron loss and excellent magnetic characteristics. When a transformer iron core is manufactured using the magnetic ribbon, a wound iron core having a joint portion on one of the pair of yoke portions, a so-called one-turn cut winding iron core, is generally used. Is increasing today. However, the magnetic ribbon, which is the iron core material of the wound iron core, is very thin as compared with the silicon steel strip, and further, when performing magnetic field annealing for removing the processing strain and improving the iron core characteristics, it becomes extremely fragile, for example, When an external force such as shock or vibration is applied to the wound core, a part of the core may be lost or damaged.

Therefore, when manufacturing a wound iron core using the magnetic ribbon, there is, for example, a manufacturing method described in Japanese Patent Publication No. 6-56819. This manufacturing method is shown in FIG.
4 to FIG. 21. That is, for example, a circular core formed by continuously winding a magnetic ribbon a predetermined number of times,
It is cut at one place on its outer periphery and expanded into a strip shape, and then, with one end of the strip-shaped iron core in the lengthwise direction being shifted in a stepwise manner, the strip-shaped iron core is processed into a circular shape again and made one turn. A wound core body of a cut type is formed, and this is further rectangular-shaped by a molding jig (not shown) to form a wound core 1 shown in FIG.
Or one or a plurality of magnetic thin strips are sequentially cut for each length dimension of one winding of the wound core, and the strip-shaped iron core is wound in a circular shape by a winding plate machine (not shown). The wound core body is provided, and the wound core body is formed into a rectangular shape by using a forming jig as described above, thereby forming the wound core core 1 shown in FIG.

When the wound iron core 1 is in the state of a circular wound iron core body, an outer reinforcing frame a made of a silicon steel strip is provided on the outer side of the wound iron core 1 and an opening end is provided on the inner side of the wound iron core 1 on the joint portion b side. In addition, the inner reinforcing frame c arranged in the above is further provided with the innermost reinforcing frame e, which is inserted into the inner reinforcing frame c with the abutting portion d of the tip positioned in the direction opposite to the joint b. And
The rectangular-shaped wound core 1 is fitted and held in a separately formed forming and holding frame (not shown) and magnetically annealed to perform shaping so as to maintain a rectangular state. Even if the molded holding frame is removed, the rectangular state can be satisfactorily held by the reinforcing frames a, c, and e.

Next, the innermost reinforcing frame e and a molded holding frame (not shown) are removed from the wound core 1 which has been magnetically annealed, and then,
Yoke portions f of the wound core 1, and insert the molding die 2 as shown in FIG. 2 between f _1, followed, between grooves 5,5 of the mold 2, the plate -Shaped template 4 is press-fitted to hold the wound core 1 in a rectangular state. After that, for example, a room temperature curable adhesive is applied to the laminated end faces of the pair of leg iron parts g, g of the wound iron core 1 at a constant interval to provide an adhesive part 6, and the adhesive part 6 is used. Then, a thin insulating paper is wound around the leg iron parts g, g, and the adhesive tape 7 for fixing the insulating paper is wound around and adhered to the outer side of the leg iron parts g, g to insulate the leg iron parts g, g. 8 is formed. As described above, the wound iron core 1 in which the leg reinforcing portions g, g are provided with the insulating reinforcing portions 8 is provided with the molding die 2,
3 and template 4 are removed.

[0006] The winding core 1 to the molding dies 2 and 3 and the template 4
Even if is removed, the wound iron core 1 is deformed by the inner and outer reinforcing frames a and c and the insulating reinforcing portion 8 wound around the leg iron portions g and g, causing the laminated end surface weakened by annealing to lose its shape. It is possible to satisfactorily avoid peeling off due to external forces or the like, and it is possible to strengthen the rigidity of the entire wound core 1 including the leg iron parts g, g. Then, the yoke portion f ₁ of the wound core 1 on the joint b side is opened at the joint b. That is, as shown in FIG. 21, the wound iron core 1 is expanded into a U shape at the joint b. On the other hand, a winding wire 9 is arranged at a position corresponding to the U-shaped expanded winding iron core 1, and an iron core insertion hole h of this winding wire 9 is previously extracted from the winding iron core 1. The innermost reinforcing frame e is formed into a rectangular shape and fitted. In the above state, the yoke portion f ₁ on the joint b side of the wound iron core 1 which is expanded in a U shape is made to face the iron core insertion hole h of the winding 9 and fitted into the iron core insertion hole h in one operation. Put in.

When the leg iron parts g of the winding iron core 1 are inserted into the iron core insertion holes h of the winding 9, the expanded yoke part f ₁ having the joint b is closed to the original state. Is rejoined to the state before opening the yoke portion f ₁ . After that, as shown in FIG. 22, the insulating material 1a composed of a spacer or a wedge is press-fitted into the gap between the axial end surface of the winding wire 9 and the end surface of the winding core 1 inside the window to form the winding core 1 and the winding core 1. The winding 9 and the winding 9 are integrally fixed. After the winding core 1 is inserted into the winding 9 and the assembly is completed, a quick-drying adhesive is applied to the laminated end surfaces of the winding core 1 located outside the winding 9 on the yoke portions f and f ₁ side. By assembling the coated paper 10 made of a thin insulating material on the coated surface, the assembly of the wound core 1 is completed. Is raised to the winding core 1 After completing the assembly of the wound core 1, the yoke portion f, contact the clamp (not shown) to f ₁ equivalent, winding retainer between these clamps, the axial end faces of the winding 9 A wound core transformer was manufactured by fastening the wound core to the wound core 1 with the interposition of.

[0008]

However, the above-mentioned conventional technique is used.
By using a wound core of 1-turn cut method
When manufacturing a transformer, there were the following problems. (1), the wound core 1 formed into a rectangular shape was magnetically annealed.
And the yoke part f₁Side joint part b is opened and the winding core is U-shaped
When it is expanded into the iron core insertion hole h of the winding 9,
In the core 1, the leg iron parts g, g are covered with the insulation reinforcing part 8.
Nono, Yoke part f, f ₁What kind of coating means is applied to
Since there is not, the expanded yoke part f of the winding core 1₁Insert core on side
When inserted from one side of the hole h and pulled out from the other side, the wound core 1
Since it is extremely brittle due to magnetic field annealing, the yoke part f
₁Is part of the wall surface of the iron core insertion hole h of the winding 9, or
Countless fragments of the iron core are slidably contacting the inner reinforcing frame e and the iron core insertion hole h
It will fall inside or be scattered around it.

For this reason, the wound iron core 1 inserted into the winding 9 is reassembled after removing the broken pieces with a vacuum cleaner or the like. However, the broken pieces of the iron core are the core insertion hole h and the shaft of the winding 9. There is a case where it penetrates into the inside from the end face in the direction, and in this case, it was very difficult to remove it. Therefore, winding 9
There is a risk that fragments of the iron core that have entered the inside or inside of the iron core insertion hole h will float in the insulating oil during operation of the wound core transformer, and if such fragments exist in the oil, they threaten the insulation of the wound core transformer. There is a risk of inducing an interlayer short circuit accident of the winding 9.

(2) As means for solving the problem of the iron core fragments, for example, a wound iron core 1 after magnetic field annealing is used.
After being expanded into a U-shape, the entire surface of the wound iron core 1 is covered with a fiber cloth, or a box made of an insulating material such as insulating paper is put on the wound iron core 1 to assemble the winding 9. Was going on. However, in the former case, it is necessary to wind the fiber cloth around the entire winding core 1 when assembling the winding core 1.
After the winding core 1 is inserted into the winding 9, when reassembling the yoke portion f ₁ having the joint b, the fiber cloth at that portion is once removed, and after the reassembling of the yoke portion f ₁ is performed again. Since the fiber cloth is wound or pasted, a great deal of time and labor are required for assembling the wound core 1, which is a major factor that hinders the productivity of the wound core transformer.

In the latter case, it is necessary to prepare a box body to cover the winding core 1 in a separate step in advance, which is time-consuming, and in assembling the winding core 1, the box body is covered with legs of the winding core 1. After the winding iron core 1 is inserted into the winding 9 by fitting only the iron parts g, g and the reassembling of the yoke part f ₁ having the joint b is completed, the yoke parts f, f ₁ are connected to the leg iron. Since the box body different from the parts g and g is used for coating, also in this case, it takes a lot of time to cover the winding core 1 with the box body, which is a problem in improving the productivity of the winding core transformer. was there.

Further, as described above, when the wound iron core 1 is covered with a fiber cloth or a box is fitted, the wound iron core 1 expanded in a U shape has a yoke portion having a joint portion b. Since only f ₁ will be covered separately from the leg iron parts g, g,
If there is a gap between the covering portion of the yoke portion f _{1 and} the covering portions of the leg iron portions g, g, fragments of the iron core will leak out from this portion, and the covering portion on the yoke portion f ₁ side will leak. It was necessary to specially cover (seal) the boundary between the leg iron part g and the covering part on the g side. Moreover, in order to cover the entire wound iron core 1, the wound iron core 1 must be enlarged by the covering member, and the winding 9 for inserting the wound iron core 1 must be made large. Along with the increase in size of the container, there was a problem of making the manufacturing cost higher than necessary.

In view of the above-mentioned various problems, the present invention simplifies the work of covering the wound iron core and ensures that the fragments of the iron core enter the winding or float in the insulating oil. Another object of the present invention is to provide a wound core transformer and a method for manufacturing the same.

[0014]

According to the present invention, a one-turn cut type winding core made of an amorphous magnetic alloy ribbon is formed into a rectangular shape, the winding core is annealed in a magnetic field, and the winding core is An insulating reinforcing member is formed by winding a thin insulating member around the leg iron portion. The wound iron core expands into a U-shape by opening the yoke portion having the joint portion at the time when the insulating reinforcing portion is formed. On the other hand, on the winding side in which the leg iron portion of the winding iron core is fitted and held, the iron core insertion hole located at the center of the axial end face of the winding iron core is provided at the exit and the entrance, respectively, and the window holes corresponding to the exit and the entrance, respectively. A pair of wide and horizontally long heat-resistant and oil-resistant materials that can sufficiently cover the yoke portion of a wound iron core having a brim around the periphery of the window with a constant width dimension, for example, a fiber Insulating members such as members and insulating paper are arranged on both end faces in the axial direction of the winding by fixing the brim to the inner edge of each of the outlet and the inlet of the iron core insertion hole.

When the wound core is incorporated into a winding to manufacture a wound core transformer, the joint is provided on the side of the open yoke portion having the joint of the wound core expanded in a U shape. Wear a protective cap for the iron core to prevent the iron parts from coming into contact with the winding and causing the iron core fragments to scatter around the winding. on the other hand,
A pair of wide insulating members arranged on both ends of the winding in the axial direction is a hindrance when the winding iron core is fitted into the winding, so that the winding core is wrapped around the outer peripheral surface of the winding in advance. Hold it by folding it back with. In this state, the wound iron core expanded in a U-shape is inserted from the opened yoke portion into the iron core insertion hole of the winding in almost one operation, and then the opened yoke portion is joined to the joint portion. The reassembly of the wound core is completed by rejoining at. After that, the insulating member folded back to the outer peripheral surface side of the winding is returned to each yoke portion side of the winding core, and these yoke portions are wrapped and covered from all directions from the laminated end surface to the outer peripheral surface side. By doing so, a wound core transformer is manufactured.

[0016]

In the present invention, when the exposed portion of the winding core incorporated in the winding as described above is covered, a wide insulating member is previously arranged on both axial end surfaces of the winding. Keep it. This insulating member has a window hole opened at a position corresponding to the iron core insertion hole of the winding, and a brim edge for fixing the insulating member to the iron core insertion hole is integrally formed in this window hole. Therefore, the insulating member can be arranged on the winding by using the brim edge by fixing the brim edge with an adhesive agent as a margin. Further, when the winding iron core is incorporated into the winding iron core insertion hole, the insulating member serves as a hindrance to the incorporation of the winding iron core, and therefore may be folded on the outer peripheral surface side of the winding. In this case, since the insulating member is fixed only to the brim of the window hole, the winding member can be easily bent. Then, after inserting the winding core into the winding wire and reassembling it, the folding of the insulating member is released, and the yoke portion of the winding core protruding outward from both axial end faces of the winding wire is insulated. And wrap it to cover.

As described above, the yoke portion of the wound iron core incorporated in the winding can be completely covered with the insulating member having the flange of the window hole fixed in the iron core insertion hole of the winding. , Even if the iron core fragments generated by the impact when the winding core is assembled are left in the core insertion hole of the winding, these fragments never leak from the core insertion hole to the outside of the winding. It is possible to reliably prevent the fragments of the iron core from leaking to the outside by either remaining in the iron core insertion hole as they are or by merely moving inside the insulating member. Further, since both end faces in the axial direction of the winding are completely covered with the insulating member when the winding iron core is assembled, it is possible to reliably prevent fragments of the iron core from entering the inside from the end face of the winding. As described above, in the present invention, the exposed portion of the winding core incorporated in the winding is covered with an insulating member arranged in advance on the winding side to completely prevent the fragments of the iron core from leaking to the outside. Therefore, it is possible to reliably eliminate the harmful effects caused by the fragments of the iron core floating in the insulating oil during the operation of the wound core transformer.

[0018]

Embodiments of the present invention will be described below with reference to FIGS. In addition, in FIG. 2 to FIG. 4, a 1-turn cut type winding core 1 using an amorphous magnetic alloy ribbon is used.
After forming the winding core 1 into a rectangular shape and performing magnetic field annealing, winding a thin insulating member around the leg iron portions g of the winding core 1 to form the insulating reinforcing portion 8. Since the process of manufacturing the wound iron core 1 is the same as the conventional process, the description thereof will be omitted. Further, when the parts shown in FIGS. 5 to 16 are the same as the parts shown in FIGS. 2 to 4 and 21, the same reference numerals are used for description.

The wound core transformer 11 shown in this embodiment is the same as that shown in FIG.
Shows the state completed by using the manufacturing method of the present invention, the gist of which is on both end surfaces of the winding 9 in the axial direction.
Assemble the winding 9 by using a wide sheet of fiber material (woven cloth, non-woven cloth) or insulating paper (see Fig. 5) 12 and 13 that has a wide width and is excellent in heat resistance and oil resistance. The yoke portions f and f ₁ of the wound core 1 are completely covered so that the fragments of the core do not leak outside.

Next, in FIGS. 5 and 6, on both axial end faces of the winding 9, as shown in FIG. 6 in advance, an insulating member having a width sufficiently wider than the area of the axial end face of the winding 9 is provided. 12, 13
Is provided. As shown in FIG.
As shown by, a window hole 14 having the same shape as the iron core insertion hole h is opened at a position corresponding to the iron core insertion hole h of the winding wire 9, and insulating members 12 and 13 are stopped at the periphery of the window hole 14. The brim 15 for wearing is formed with a constant width dimension (size margin). When the insulating members 12 and 13 are attached to the winding 9, since the insulating members 12 and 13 are formed to have a wide width, the brim 15 is formed so that the window hole 14 corresponds to the exit and the entrance of the iron core insertion hole h. When the inner core edge of the iron core insertion hole h is fixed by using a joining means such as an adhesive, the insulating members 12, 13
As shown in FIG. 6, the coil 9 is held on both axial end faces of the winding 9 with a sufficient width to cover both axial end faces thereof. Needless to say, the insulating members 12 and 13 are formed to have a size that can completely cover the yoke portions f and f ₁ of the wound iron core 1.

On the other hand, the wound iron core 1 has its leg iron parts g, g shown in FIG.
After forming the insulating reinforcing portion 8, as shown in FIG.
The yoke portion f ₁ side having the above is opened at the position having the joint portion b, and the winding core 1 is changed from the rectangular state whose plane shape is shown in FIG. 4 to the yoke portion f _{1 as} shown in FIG. The f ₁ is expanded until it reaches a position on the same line as the leg iron portions g, that is, the planar shape is a U shape. As shown by the chain double-dashed line in FIG. 7, the yoke portions f ₁ and f ₁ of the wound iron core 1 which are expanded in a U-shape have a bag-like shape such as brass, which is relatively soft and highly stretchable. The iron core protective cap 16 is put on in advance.

As described above, when the winding iron core 1 is expanded into a U-shape, the amorphous magnetic alloy thin ribbon forming the winding iron core 1 constitutes the outer reinforcing frame a, for example, a silicon steel ribbon. In comparison, since the plate thickness is about 1/10 or less, the outer reinforcing frame a can be easily formed with almost no internal strain in the wound iron core 1 itself.
It is possible to expand to the open position. Further, the work of opening the yoke portion f ₁ is performed by insulating the reinforcing portions 8 formed on the leg iron portions g, g of the winding iron core 1, the outer reinforcing frame a arranged on the outer peripheral surface of the winding iron core 1 and the inner peripheral surface. Since the wound core 1 is sufficiently retained in rigidity by the arranged U-shaped inner reinforcing frame c, it does not undergo self-weight deformation or shape deformation when the yoke portion f ₁ is expanded, The wound iron core 1 can be smoothly and satisfactorily opened and held in a U-shape.

The wound iron core 1 expanded in the U-shape as described above is mounted on the iron core insertion device 17 described below by using a lifting conveyance means such as a crane or a chain block, which is not shown, and a metal plate or the like. The board is mounted via the insertion assisting plate 18 having a U-shaped planar shape.

As shown in FIG. 9, the iron core insertion device 17 for mounting the U-shaped expanded winding core 1 is provided with a roller conveyor 19 and a U-shaped expanded winding iron core 1 as a roller conveyor. The winding auxiliary core 18 is movably mounted on the roll supporting member 19, and a supporting device 20 for the winding wire 9 provided in the middle of the roller conveyor 19.
The insertion assisting plate 18 on which is mounted is capable of mounting the expanded yoke part f ₁ , the leg iron parts g, g, and the other yoke part f bridging the leg iron parts g, g. It has the same shape as the wound core 1.

Further, as shown in FIG. 9, the supporting device 20 for the winding 9 installed in the middle of the roller conveyor 19 is as follows.
A winding support base housed and installed in the middle of the roller conveyor 19 via height adjusting means (not shown) so that the iron core insertion hole h of the winding 9 and the roller portion of the roller conveyor 19 are at the same height position. 21 and a pair of winding support plates 2 mounted on both sides of the support base 21 in the width direction (direction orthogonal to the length direction of the roller conveyor 19) so as to be movable along the width direction.
It is formed by 2 and. Then, the winding 9 is placed on the winding support base 21 in advance before the winding iron core 1 is assembled.

That is, the windings 9 are arranged side by side on the winding support base 21 with the iron core insertion holes h facing the traveling direction of the roller conveyor 19, and are attached to both ends of the winding support base 21 in this state. By bringing the pair of winding support plates 22 into contact with one side of the outer peripheral surface of the winding 9 and fastening the winding support plate 22 to the winding support base 21 using the fastening bolts 22a or the like, The winding 9 is firmly sandwiched by the winding support plate 22 and
Supported above. When the winding 9 is supported and fixed to the winding support base 21 on the roller conveyor 19, the wide insulating members 12 and 13 arranged on both axial end surfaces of the winding 9 are shown in FIGS. As described above, since the brim 15 of the window hole 14 is adhered to the inner edge of the iron core insertion hole h, the axial end surface of the winding 9 is completely wrapped and the outer peripheral surface side of the winding 9 is In the state of being folded by folding, etc., it is temporarily fixed with tape or the like along the peripheral surface and temporarily held (insulating members 12 and 13 are shown by the one-dot and two-dot chain lines in FIG. 9).

Further, in the winding 9, an innermost reinforcing frame e which does not form one turn and which is removed when the insulating reinforcing portion 8 is formed on the leg iron portions g of the winding iron core 1 is shown in FIG. As shown by 8, in the state of being rectangularly formed on the innermost side of the iron core insertion hole h,
Before the insulating members 12 and 13 are arranged on the winding 9, they are fitted in advance. After the winding 9 is fixed as described above, the yoke portions f ₁ and f ₁ that are expanded by appropriately moving the winding iron core 1 themselves are inserted into the corresponding iron core insertion holes of the winding 9. Align so that it can be inserted into h. Then, a plate-like protective plate 23 made of, for example, a silicon steel strip is provided outside the pair of open yoke portions f ₁ and f ₁ on the leg iron portions g, g side as shown in FIG. To abut. In this state, the wound iron core 1 expanded into a U shape through the insertion assisting plate 18.
Is moved to the winding 9 side while sliding on the roller conveyor 19 to insert the pair of leg iron parts g, g of the winding iron core 1 into the insertion assisting plate 1.
8, it can be fitted into the iron core insertion hole h of the winding 1 through the yoke portions f ₁ and f ₁ in almost one operation.

The winding iron core 1 is inserted in the iron core insertion hole h of the winding 9 as shown in FIG.
, The plate-shaped protective plate 23 and the iron-core protective cap 16 which cover the yoke portions f ₁ and f ₁ projecting from the iron-core insertion hole h of the winding 9 are removed, and the winding iron core 1 is mounted. The inserted auxiliary plate 18 is pulled out from the iron core insertion hole h of the winding 9 in a direction opposite to the insertion direction of the winding iron core 1 into the winding 9. In this result, the state wound core 1, as shown in Figure 11-13, which yoke portions f _1, f ₁ and leg of portion g, and g is matched to the position on the same line, leg of portion g, g Is inserted and held in the iron core insertion hole h of the winding 9.

Thereafter, the winding support plate 22 is loosened and the winding 9 is
Is placed on the roller conveyer 19 from the winding support device 20 of the iron core inserting device 17, and is moved on the roller conveyer 19 and conveyed until the next reassembling process of the wound iron core 1. In reassembling the winding core 1, the lower side of the insulating members 12 and 13 folded to the lower side of the winding 9 is opened and the temporary fastening is released, as shown in FIG. Expand to the lower side of f ₁ and f ₁ . In this state, as shown in FIG. 14, the innermost layer portions of the opened pair of yoke portions f ₁ and f ₁ are sequentially bent to a closed state (inward direction) before expansion, and the joint b is formed. By rejoining each other, the reassembly of the open yoke portions f ₁ and f _{1 of} the wound core 1 is completed.

Next, the yoke portions f ₁ and f ₁ of the expanded wound core 1 are rejoined, and the free ends of the outer reinforcing frame a are superposed and joined by welding or the like, as shown in FIG. In this way, the appearance of the wound iron core 1 is adjusted. Next, the temporary fixing on the upper surface side of the insulating members 12 and 13 folded and mounted on the upper side of the outer peripheral surface of the winding wire 9 is released, and the yoke portions f and f of the wound iron core 1 are respectively released similarly to the lower surface side. Return to the ₁ side and cover the upper surfaces of the yoke portions f and f ₁ . Then, the upper surface side and the lower surface side of the insulating members 12 and 13 are folded so as to wrap them around the yoke portions f and f ₁ , respectively, and the overlapping edges of the folded portions are joined as shown in FIG. The yoke portions f, f ₁ of the wound core 1 can be completely covered with the insulating members 12, 13 by fixing the outer peripheral surfaces of the iron portions f, f ₁ with tape or the like. That is, after the winding iron core 1 is assembled in the winding wire 9 and reassembled, the insulating members 12 and 13 previously arranged on the axial end surface side of the winding wire 9 are connected to the yoke portions f and f. _By covering from both axial end surfaces to the outer peripheral surface side of ₁ and forming the covering portion 25 of the yoke portions f and f _{1 on} the outside of the yoke portions f and f ₁ as shown in FIG. A core winding transformer 11 made of an amorphous magnetic alloy ribbon is manufactured.

In the wound-core transformer 11 of the present invention constructed as described above, the yoke portions f and f ₁ projecting from both axial end faces of the winding 9 are previously attached to the winding 9 side. Since the covering portion 25 covered with the arranged wide insulating members 12 and 13 is formed, the fragments of the iron core generated when the winding iron core 1 which is weakened by annealing is assembled into the winding wire 9 are The covering portion 25 completely covers the covering portion 25.
Since it can be contained inside, it is possible to surely eliminate the harmful effects caused by the fragments of the iron core leaking out of the wound core transformer 11.

Further, since the wide insulating members 12 and 13 for covering the yoke portions f and f ₁ of the winding iron core 1 are attached to both axial end faces of the winding wire 9, the winding iron core 1 of the winding wire 9 is When fitted in the iron core insertion hole h, both end faces in the axial direction of the winding wire 9 can be completely covered with the insulating members 12 and 13 in advance, so that the winding iron core 1 is inserted into the winding wire 9 and expanded. Since the fragments of the iron core generated when rejoining the yoke portions f ₁ and f ₁ of the wound iron core 1 are not blocked by the insulating members 12 and 13 and intrude into the winding 9, there is no winding. Good insulation of 9 itself can be maintained. In addition, the insulating members 12 and 13 are provided with a window hole 14 which is wide enough to cover both axial end faces of the winding 9 and which is opened at a position corresponding to the iron core insertion hole h of the winding 9. By fixing the brim 15 corresponding to the iron core insertion hole h and integrally formed with the insulating members 12 and 13 on the peripheral edge of the window hole 14 to the inner edge of the entrance and exit of the iron core insertion hole h,
Since it can be easily attached to the winding 9, it is convenient.

Next, the wound iron core 1 will be described with reference to FIGS.
Yoke portions f, the insulating member 12a that covers the f _1, a second embodiment of 13a will be described in. 17, an insulating member 12a shown in the second embodiment, 13a has a first covering portion X oversized in portrait covering both yoke portions f, the axial end faces of the f ₁ (the stack end surface), the yoke part f, oblong second covering portion Y which covers the outer peripheral surface of the f _1, by protruding in the horizontal direction Y ₁ from the side end sides of the first covering portion X, excellent overall shape in oil and heat resistant fibers An insulating member such as a member or insulating paper is punched out in a substantially cross shape, and the second cover Y,
Each base of Y ₁ has a window hole 14 corresponding to the iron core insertion hole h of the winding 9, and a brim 15 formed around the periphery of the window hole 14 with a constant width dimension. As described in the case of attaching the insulating members 12 and 13 of the first embodiment, the insulating members 12a and 13a are attached to the winding wire 9 as shown in FIG. by fastening 15 to the mouth end of the core insertion hole h of the winding 9, the insulating member 12a of the second embodiment, 13a is in a state of projecting the second covering portion Y, the Y ₁ in the transverse direction, It can be attached to both axial end faces of the winding 9.

Next, the insulating members 12a and 13 of the second embodiment.
After attaching a to the winding 9, the wound iron core 1 expanded into a U shape
As described above, the iron core inserting device 17 is used to assemble the winding 9 as shown in FIG. 19, and then the released yoke portion f ₁ ,
Assembly of the wound core 1 is completed by reclosing the f ₁ side. Then, after assembly of the wound core 1, 19, the insulating member 12a, yoke portion f of the wound core 1 of each first covering portion X of 13a, the lamination plane by bending the end face side in the axial direction of the f ₁ At the same time as covering, the second covering portions Y, Y ₁ protruding in the lateral direction
The intact yoke portion f, while along the outer peripheral surface of the f _1, yoke portion f so as to wrap around the peripheral edge of the first covering portion X of the already folded, as shown in Figure 20 to the outer peripheral surface of the f ₁ The wound core transformer 11 is manufactured by attaching the wound core transformer.
As a result, the yoke portions f and f ₁ of the wound iron core 1 can be quickly and reliably covered by the vertically long first cover portion X and the horizontally long two second cover portions Y and Y ₁ .

At this time, the first and second cover portions X, Y, Y
₁ can be easily manufactured because one fiber member may be punched or cut according to the size (capacity) of the wound core 1. Further, the yoke portions f and f ₁ of the wound iron core 1 can surely prevent the fragments of the iron core from leaking out due to the presence of the insulating members 12a and 13a, and also cover the yoke portions f and f _1. First bends the first cover X to cover the stack end face side, and then the second cover Y,
Since it suffices to cover the outer peripheral surface side of the yoke portions f, f ₁ with Y ₁ , as described in the first embodiment, the insulating members 12, 13 are formed.
Since it is not necessary to superimpose and cover the winding yokes ₁ by enclosing them in the yoke portions f and f ₁ of the winding iron core 1, there is an advantage that the covering work of the yoke portions f and f ₁ can be easily performed.

[0036]

As described above, according to the present invention, a pair of yoke portions of the winding core projecting from both axial end surfaces of the winding are arranged in advance on the winding side and have a wide width. Since I tried to wrap it up completely with a horizontal insulating member,
After manufacturing the wound core transformer, it is possible to reliably prevent the fragments of the core from leaking to the outside. Therefore, it is possible to surely solve the problem that the fragments of the iron core float in the insulating oil during operation of the wound core transformer and adversely affect the winding.

Further, the insulating member can be easily attached to the winding by fixing the window hole facing the iron core insertion hole of the winding to the insulating portion of the iron core insertion hole. When mounting the insulating member, no special mounting member is required, and a window hole opened in the insulating member may be opened to a size through which the winding core penetrates and fixed to the core insertion hole of the winding. Can be easily installed.

Further, according to the present invention, when the winding core is fitted in the iron core insertion hole of the winding, the axial end face of the winding is covered with an insulating member in advance, so that the fragments of the iron core when the winding core is fitted are inserted. Can be prevented from entering the winding, and the insulating member itself is simply attached to the winding using the window hole, so the insulating member can be easily attached to the outer peripheral side of the winding. Since it can be folded in, it is convenient because it does not hinder the incorporation of the wound core into the winding.

The insulating member is formed in a cross shape,
The vertically long portion can wrap around the axial end surface side of the yoke portion of the wound core, and the horizontally long portion can cover the outer peripheral surface side of the yoke portion.
That is, instead of wrapping the insulating member on the yoke portion side, the yoke portion can be covered by the vertically long portion and the horizontally long portion of the insulating member, so that the work of covering the yoke portion of the wound core can be performed quickly and easily. Can be done.

[Brief description of drawings]

FIG. 1 is a perspective view showing a wound core transformer manufactured by a manufacturing method of the present invention.

FIG. 2 is a plan view showing a wound iron core that has been annealed and shaped into a rectangular shape.

FIG. 3 is an explanatory view showing a state in which an insulation reinforcing portion is formed on a leg iron portion of a wound iron core.

FIG. 4 is a plan view showing a wound core in which an insulation reinforcing portion is formed on a leg iron portion.

FIG. 5 is an exploded perspective view showing a winding and an insulating member covering an iron core in the embodiment of the present invention.

FIG. 6 is a perspective view showing a state in which an insulating member is attached to the winding.

FIG. 7 is a plan view of the wound core showing a state in which an expanded yoke portion of the wound U-shaped wound iron core is covered with an iron core protective cap.

FIG. 8 is an explanatory diagram showing a state in which a wound iron core is incorporated in a winding.

FIG. 9 is a perspective view of an iron core insertion device used to insert a wound iron core into a winding.

FIG. 10 is a perspective view showing a state in which a wound iron core is inserted in a winding.

FIG. 11 is an explanatory diagram showing a relationship between an insulating member and a wound iron core inserted in a winding.

FIG. 12 is an explanatory view showing a state in which an insulating member is put on a yoke portion of a wound iron core.

FIG. 13 is a plan view showing a state of reassembling a wound core inserted in a winding.

FIG. 14 is a plan view showing a process of reassembling the wound core.

FIG. 15 is a perspective view showing a wound iron core that has been reassembled.

FIG. 16 is an explanatory diagram showing a state in which a wound iron core is covered with an insulating member.

FIG. 17 shows a second embodiment of the insulating member that covers the iron core, and is a perspective view showing the insulating member and the winding in an exploded manner.

FIG. 18 is a perspective view of a winding showing a state in which an insulating member covering the iron core of the second embodiment is attached to the winding.

FIG. 19 is a perspective view showing a state in which a winding iron core is inserted into a winding wire attached with an insulating member covering the iron core of the second embodiment.

FIG. 20 is a perspective view of a wound iron core transformer manufactured using the insulating member covering the iron core of the second embodiment.

FIG. 21 is an explanatory view showing a state in which a wound iron core is inserted into a winding wire by a conventional manufacturing method.

FIG. 22 is a perspective view showing a wound iron core manufactured by a conventional manufacturing method.

[Explanation of symbols]

1 Winding iron core 8 Insulation reinforcement portion 9 Winding 11 Winding iron core transformer 12, 13 Insulation member 14 Window hole 15 Collar edge 25 Cover portion f, f ₁ Yoke portion g Leg iron portion h Iron core insertion hole

Claims (4)

[Claims] 1. A winding core made of an amorphous magnetic alloy ribbon, formed into a rectangular shape by forming a joint on one of a pair of yoke parts, and fitted to a pair of leg iron parts of the winding core. In a wound iron core transformer configured by including an installed winding, a window hole is opened at a position corresponding to an iron core insertion hole of the winding on both end surfaces of the winding in the axial direction, which is excellent in heat resistance and oil resistance. A wide and horizontally elongated insulating member made of a fiber member or insulating paper is provided, and the insulating member is attached to a pair of yoke portions excluding a leg iron portion into which the winding is inserted. A wound core transformer, characterized in that the portion is covered without being exposed to the outside and the covering portion is formed integrally with the yoke portion. 2. The window hole of the insulating member is formed with a collar edge that abuts the iron core insertion hole of the winding wire with a predetermined width dimension, and the collar edge is fixed to the inner edge of the iron core insertion hole of the winding wire. The wound core transformer according to claim 1, wherein the insulating member is attached to the end surface of the winding in the axial direction. 3. The insulating member includes a vertically elongated first cover portion covering an axial end surface of a yoke portion of a wound iron core, and a yoke portion protruding from both lateral sides of the first cover portion. A laterally long second cover portion that covers the outer peripheral surface is formed.
The winding core transformer described. 4. A wound core made of an amorphous magnetic alloy ribbon, formed into a rectangular shape by forming a joint on one of a pair of yoke parts, and fitted to a pair of leg iron parts of the wound core. In the winding core transformer manufacturing method for manufacturing a wound core transformer by including the mounted winding, a window hole is provided at a position corresponding to the iron core insertion hole of the winding on both end faces in the axial direction of the winding. A step of arranging an insulating member having a width sufficient to cover the axial end face of the winding by fixing the brim around the window hole to the inner edge of the core insertion hole of the winding. And a step of bending the insulating member toward the outer peripheral surface of the winding to cover the end faces of the winding in the axial direction, and opening the joint provided on one yoke portion of the winding core to open the legs of the winding core. A step of inserting the iron part into the iron core insertion hole of the winding, a step of rejoining the opened yoke part, and an insulating member bent to the outer peripheral surface side of the winding are provided. A step of covering each of the pair of yoke portions of the winding core, and a step of wrapping the pair of yoke portions with an insulating member covering the pair of yoke portions to form a coating portion on the yoke portion of the winding core. A method of manufacturing a wound-core transformer, comprising: