JPH05335157A - Transformer - Google Patents

Abstract

PURPOSE:To lessen an iron core in height so as to decrease a transformer in size by a method wherein a screw linking structure is provided to link an upper yoke clamping piece with an upper/lower linking piece at the upper end of the upper yoke clamping piece, and the upper yoke clamping piece is urged toward a winding wire by driving the screw of the screw linking structure. CONSTITUTION:An upper yoke clamping piece 21 is made to bear against the upper end of a winding wire 2 through the intermediary of a winding wire support insulator 12 to link an upper linking piece 26 with the upper end of the upper yoke clamping piece 21. A winding wire fastening screw linking mechanism is composed of a winding wire fastening bolt 29 welded to the upper end of an upper/lower linking piece 23 and a winding wire fastening nut 30 screwed into the fastening bolt 29. The winding wire 2 is fastened by this screw linking mechanism, the upper yoke clamping pieces 21 are clamped by bolts at the both the sides of the leg 1c of an iron core as it is urged to draw to each other. By this setup, the upper end of a winding wire and the upper yoke of an iron core can be lessened in space between them.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises an iron core having upper and lower yoke portions and legs extending between the yoke portions, and a winding fitted to the leg portions of the iron core. It relates to a transformer for electric power.

[0002]

2. Description of the Related Art As dry type transformers used in power distribution equipment, those shown in FIGS. 13 to 16 are used. In these drawings, 1 is an iron core having an upper yoke portion 1a, a lower yoke portion 1b, and three leg portions 1c provided between these yoke portions, and 2 is each leg portion of the iron core 1. It is a winding fitted to 1c. The winding 2 is composed of a primary winding 2a and a secondary winding 2b, and each of these windings has a structure in which a coil is molded with an insulating resin.

A pair of upper yoke fastening members 3 made of channel material with the upper yoke portion 1a of the iron core 1 sandwiched therebetween.
3 are provided, and the lower yoke fastening fittings 4 and 4 are provided with the lower yoke portion 1b sandwiched therebetween. The upper yoke fastening fittings 3, 3 and the lower yoke fastening fittings 4, 4 are fastened in a state of being urged by bolts 5 and 6 in a direction in which they are pulled toward each other. The iron part 1a and the lower yoke part 1b are fastened in the laminating direction of the steel plates.

A strip-shaped upper and lower connecting fitting 7 for connecting between the upper yoke fastening fitting 3 and the lower yoke fastening fitting 4 which are vertically opposed to each other while being fitted to each leg 1c of the iron core 1.
Are provided on both sides of each leg 1c. The lower end of the upper and lower connecting fittings 7 is fixed to the lower yoke fastening fitting 4, and the upper end of the connecting fitting 7 is fixed to the upper yoke fastening fitting 3 via a pin 8. At the upper ends of the upper yoke fastening fittings 3 and 3,
Both ends of a plate-shaped upper surface connecting fitting 9 bent into a mountain shape are fixed by bolts 10.

Lower end of winding 2 and lower yoke fastening fittings 4, 4
A plurality of lower winding support insulators 11 are arranged radially between the upper and lower winding windings, and a plurality of upper winding support insulators 1 are provided on the upper end of the winding 2.
2 are arranged radially.

A winding retainer plate 13 is disposed on each upper winding supporting insulator 12 disposed at the upper end of the winding 2, and a winding tightening bolt 14 welded to the winding retainer plate 13 is attached to the upper portion. It is fitted in a hole 3 a provided in the lower portion of the yoke tightening fitting 3. A winding tightening nut 15 and a lock nut 16 are screwed onto the bolt 14, and by tightening the winding tightening nut 15, the winding holding plate 13 is urged downward to tighten the winding 2 in the axial direction. ing.

[0007]

In the above-mentioned conventional transformer, the winding retainer plate 13 and the winding tightening bolt 14 are provided between the upper winding support insulator 12 and the lower end of the upper yoke tightening fitting 3.
Since the winding 2 is tightened in the axial direction by providing the winding tightening device including the nut 15 and the nut 15 and 16, the distance a'between the winding 2 and the upper yoke portion 1a of the iron core is increased, and the iron core is increased. The height H of No. 1 (see FIG. 16) becomes high, and the size of the transformer becomes large.

An object of the present invention is to provide a transformer capable of applying a tightening force to a winding without increasing the size of an iron core.

[0009]

SUMMARY OF THE INVENTION The present invention provides an iron core having an upper yoke portion and a lower yoke portion and at least two legs arranged between the two yoke portions, and an iron core of the iron core. A pair of upper yokes arranged so as to face each other with the winding fitted to at least one of the legs and the upper yoke portion of the iron core interposed therebetween and tightening the upper yoke portion in the laminating direction of the steel plates. A pair of lower yoke fastening fittings, which are arranged so as to face each other with the fastening metal fitting and the lower yoke portion of the iron core interposed therebetween and tighten the lower yoke portion in the stacking direction, and at positions corresponding to the legs of the iron core. The present invention relates to a transformer including upper and lower connecting fittings for respectively connecting a pair of upper yoke tightening fittings and a corresponding lower yoke tightening fitting.

In the present invention, the upper yoke fastening member is brought into contact with the upper end of the winding through the winding support insulator. Then, a screw connection mechanism is provided on the upper end side of the upper yoke fastening fitting to connect the upper yoke fastening fitting and the upper and lower connecting fittings.
By tightening the screw of the screw connecting mechanism, the upper yoke tightening fitting is urged toward the winding side.

In the case where an upper surface connecting metal fitting for connecting between upper end portions of a pair of upper yoke fastening metal fittings is provided on the upper end side of the iron core, the screw connecting mechanism is connected to the upper end of the upper and lower connecting metal fittings and the upper surface connecting metal fitting. Can be provided between.

The screw connecting mechanism may be provided between the upper ends of the pair of upper yoke fastening members and the upper ends of the upper and lower connecting members corresponding to the pair of upper yoke fastening members, respectively. In this case, it is preferable to provide the upper connecting fitting so as to connect the upper and lower connecting fittings respectively corresponding to the pair of upper yoke fastening fittings on the upper end side of the iron core.

[0013]

As described above, a screw connecting mechanism is provided on the upper end side of the upper yoke tightening member to connect the upper yoke tightening member and the upper and lower connecting members, and the screw of the screw connecting mechanism tightens the upper part. By urging the yoke tightening bracket toward the winding side, the gap between the upper end of the winding and the upper yoke part of the iron core can be shortened, and the height of the iron core can be reduced. The size of the transformer can be reduced.

[0014]

1 to 7 show a first embodiment of the present invention. FIG. 1 is a longitudinal sectional view showing a main part of the embodiment, and FIG. 2 is a screw connecting mechanism used in the embodiment. Is an exploded perspective view, and FIG. 3 is an enlarged view showing the vicinity of the upper ends of the upper and lower connecting fittings. 4 and 5 are a front view and a top view, respectively, showing the overall structure of the same embodiment, and FIGS. 6 (A) and 6 (B) are respectively a connecting structure of a lower yoke tightening fitting and an upper and lower connecting fitting. It is sectional drawing and the disassembled perspective view which showed an example. 7A and 7B are a cross-sectional view and an exploded perspective view showing another example of the coupling structure of the lower yoke fastening fitting and the upper and lower connecting fittings, respectively.

In these figures, 1 is an iron core having a structure similar to that shown in FIG.
It is composed of a lower yoke portion 1b and at least two leg portions 1c provided between the two yoke portions.
Is placed on top of.

21 and 21 are arranged so as to face each other with the upper yoke portion 1a in between, and a pair of upper yoke fastening fittings 22 and 2 for fastening the upper yoke portion 1a in the laminating direction of the steel plates.
Reference numeral 2 is a pair of lower yoke fastening fittings which are arranged so as to face each other with the lower yoke portion 1b in between and which fasten the lower yoke portion in the stacking direction.

Numeral 23 is arranged along each leg 1c of the iron core 1 to connect the pair of upper yoke fastening fittings 21 and 21 with the corresponding lower yoke fastening fittings 22 and 22, respectively. In the metal fittings, the upper yoke fastening fittings 21 and the lower yoke fastening fittings 22 are in contact with the upper yoke portion 1a and the lower yoke portion 1b via the upper and lower connecting fittings 23.

As shown in FIGS. 6 (A) and 6 (B), a pin 24 is welded to the lower yoke tightening metal member 22, and the pin 2 is welded.
4 is fitted in a hole 23 a provided at the lower end of the upper and lower connecting fittings 23 to connect the upper and lower connecting fittings 23 and the lower yoke fastening fitting 22. The lower yoke fastening clamp 22 is the iron core base 2
It is mounted on a mounting base 25 welded on the base plate 0 and bolted to the mounting base 25. Lower yoke tightening bracket 2
The bolts 2 and 22 are tightened in a state in which they are urged by bolts 6 in a direction in which they are attracted to each other, whereby the lower yoke portion 1b is tightened in the stacking direction.

A winding 2 made of a mold coil is fitted on the leg 1c of the iron core. The winding 2 is composed of a primary winding 2a and a secondary winding 2b, and a plurality of lower winding support insulators 11 arranged radially between the lower ends of these windings and the lower yoke tightening fitting 22. Has been inserted. At the upper end of the winding 2, a plurality of upper winding support insulators 12 which are also radially arranged are arranged, and the upper yoke fastening metal fitting 21 contacts the upper end of the winding 2 via the upper winding support insulator 12. It is touched.

A plate-shaped upper connecting fitting 26 is provided so as to connect the upper yoke fastening fittings 21 and 21 at the position where the upper and lower connecting fittings 23 are provided. A mounting base 27 for abutting both ends of the upper surface connecting metal fitting 26 is welded to the upper surface of the upper yoke fastening metal fitting 21, and bolts 28, 2 inserted into mounting holes 26 a, 26 a provided at both ends of the upper surface connecting metal fitting 26.
8 is screwed into the screw holes 27a, 27a provided in the mounting base 27 so that the upper surface connecting metal fitting 26 becomes the upper yoke fastening metal fitting 21.
Has been concluded.

As shown in FIGS. 2 and 3, a winding tightening bolt 29 is welded to the upper end of the upper and lower connecting fittings 23.
The winding tightening bolt 29 is led out upward through through holes 26 b provided at both ends of the upper surface connecting fitting 26. A winding tightening nut 30 is screwed onto the winding tightening bolt 29, and a spring washer 31 is inserted between the nut 30 and the upper surface connecting fitting 26. When the nut 30 is tightened, the upper yoke fastening fitting 21 is biased toward the winding 2 via the upper surface fitting 26, whereby the winding 2 is fastened in the axial direction.

In this embodiment, a winding tightening bolt 29 welded to the upper ends of the upper and lower connecting fittings 23 and a winding tightening nut 30 screwed onto the bolt constitute a screw connecting mechanism for tightening the winding. ing.

After the winding 2 is tightened by the screw connection mechanism, the upper yoke tightening fittings 21 and 21 are attached to the legs 1 of the iron core.
The upper yoke portion 1a of the iron core is fastened in the stacking direction by being fastened in a direction in which the bolts 5 are attracted to each other at positions on both sides of c.

At both ends of the upper yoke fastening member 21, suspension ears 32, 32 (FIG. 4) used when suspending the transformer are provided.
Are welded.

As described above, a screw connecting mechanism for tightening the winding is provided on the upper end side of the upper yoke tightening member 21, and the lower yoke is tightened by tightening the screw (bolt 29 and nut 30) of the screw connecting mechanism. By urging the metal fitting 22 toward the winding side to tighten the winding 2, the distance a between the upper end of the winding 2 and the upper yoke portion 1a can be reduced.

That is, in the conventional transformer, as shown in FIG. 8A, the insulation distance (thickness of the winding support insulator 12) between the upper end of the winding wire 2 and the iron core is represented by b. The distance required to be provided between the lower end of the upper yoke fastening member 21 and the winding support insulator 12 in order to provide the tightening bolt 14 is c, and the lower end of the upper yoke fastening member 21 from the center of the upper yoke portion 1a. Is a distance from the center of the upper yoke portion 1a to the yoke portion 1a
The distance a ′ between the upper end of the winding 2 and the upper yoke portion 1a is a ′ = b + c + d−e (1) On the other hand, in the transformer of the present invention, as shown in FIG.
As shown in FIG. 4, it is not necessary to provide a space c between the lower end of the upper yoke fastening member 21 and the winding support insulator 12 for providing the winding tightening bolt. The distance a between the iron portion 1a and the iron portion 1a is a = b + d-e <a '(2), and the distance between the upper end of the winding and the upper yoke portion can be reduced. Therefore, the height of the iron core 1 can be reduced, and the transformer can be downsized.

In the above embodiment, the lower ends of the upper and lower connecting fittings 23 and the lower yoke tightening fittings 22 are connected via the pins 24. However, in the case of a transformer having a larger capacity, FIG.
As shown in (A) and (B), the lower ends of the upper and lower connecting fittings 23 and the lower yoke fastening fittings 22 are connected via pins 24, and then further fastened by bolts 32, 32. Preferably. In FIG. 7 (B), 22a is a hole provided in the lower yoke fastening fitting 22 for inserting the bolt 32, and 23b is a screw hole provided in the lower end of the upper and lower connecting fitting 23 for screwing the bolt 32. Is.

In the above embodiment, the screw connecting mechanism is provided between the upper ends of the upper and lower connecting fittings 23 and the upper connecting fitting 26. However, the screw connecting mechanism is provided on the upper end side of the upper yoke fastening fittings 21 and 21. The yoke tightening fittings 21 and 21 and the upper and lower connecting fittings 23 and 23 may be provided so as to be connected to each other, and the present invention is not limited to the case where the screw connecting mechanism is provided as in the above embodiment.

FIGS. 9 and 10 show another embodiment of the present invention. In this embodiment, a screw connecting mechanism is provided between the upper yoke fastening fitting 21 and the upper ends of the upper and lower connecting fittings 23. ing. That is, in this embodiment, the upper surface connecting fitting 26
Both ends of the are bent at right angles, and the bent portions 26A, 26A
The bent portions 26A, 26A are in contact with the facing surfaces of the upper and lower connecting fittings 23, 23 provided at both ends of the upper yoke portion 1a in the stacking direction. Mounting holes 26c, 26c are provided in each bent portion 26A, and through holes 23c, 23c aligned with these mounting holes are provided at the upper ends of the upper and lower connecting fittings 23, 23. In addition, the L-shaped mounting bracket 3 is provided on the outer surface of the upper and lower connecting brackets 23, 23.
3 is abutted, and the attachment fitting 33 is attached to the upper and lower connecting fittings 23.
Screw holes 33 aligned with the through holes 23c, 23c of
c, 33c are provided. Bolts 34, 34 inserted in the mounting holes 26c, 26c and the through holes 23c, 23c
Are screwed into the screw holes 33c and 33c, respectively, and the upper surface connecting fitting 26 and the mounting fitting 33 are fastened together by these bolts and connected to the upper and lower connecting fittings 23. A hole 23d is formed at the upper end of the upper and lower connecting fittings 23, and this hole 23d
Can be used to pick up a transformer. That is, in this example, the upper ends of the upper and lower connecting fittings 23 form suspension ears of the transformer.

At the lower end of the mounting member 33, the vertical direction (winding 2
The upper end of the winding tightening bolt 35 extending in the axial direction) is welded, and the bolt 35 is inserted into a through hole provided through the horizontal plate portion of the upper end of the upper yoke tightening fitting 21. A winding tightening nut 36 and a lock nut 37 are screwed into the winding tightening bolt 35, and
The upper yoke tightening metal fitting 21 is urged toward the winding 2 side by tightening, and the winding 2 is tightened in the axial direction (vertical direction).

In this embodiment, the mounting member 33, the winding tightening bolt 35, and the winding tightening nut 36 constitute a screw connecting mechanism, and the screw (bolt 35 of the screw connecting mechanism is formed.
By tightening the nut 36) and the nut 36), the upper yoke tightening fitting 21 is biased toward the winding side to tighten the winding 2.

According to the embodiment shown in FIGS. 9 and 10, the distance a between the upper end of the winding 2 and the upper yoke portion 1a of the iron core is reduced as in the embodiment shown in FIGS. can do.

In the embodiment shown in FIG. 9, the winding fastening bolt 35 is welded to the fitting 33, but as shown in FIG. 11, the winding fastening bolt 35 is welded to the upper end of the upper yoke fastening fitting 21. Then, the bolt 35 may be inserted into a hole provided in the mounting member 33, and the winding tightening nut 36 and the lock nut 37 may be screwed into the bolt 35.

In the embodiment shown in FIGS. 1 to 7, the winding fastening bolts 29 are welded to the upper ends of the upper and lower connecting fittings 23, but as shown in FIG.
A screw hole is formed in the bent portion 23A formed by bending the upper end of 3 at a right angle, and the winding tightening bolt 38 inserted into the hole provided in the upper surface connecting metal fitting 26 is connected to the bent portion 23A of the upper end of the upper and lower connecting metal fittings 23. Alternatively, the upper yoke fastening fitting 21 may be biased toward the winding 2 by screwing the bolt 38 into the screw hole and fastening the bolt 38.

In the above embodiment, the case of using a tripod core is taken as an example, but it goes without saying that the present invention can be applied to the case of using a tripod core.

[0036]

As described above, according to the present invention, the screw coupling mechanism for coupling the upper yoke fastening metal fitting and the upper and lower coupling metal fittings is provided on the upper end side of the upper yoke fastening metal fitting, and the screw coupling mechanism is provided. Since the upper yoke tightening fitting is biased toward the winding by tightening the screw of the connecting mechanism, the gap between the upper end of the winding and the upper yoke of the iron core can be shortened, and the iron core There is an advantage that the height can be reduced and the size of the transformer can be reduced.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a main part of a first embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a structure near a screw coupling mechanism used in the embodiment of FIG.

FIG. 3 is a front view showing the vicinity of the upper end portion of the upper and lower connecting fittings used in the embodiment of FIG.

FIG. 4 is a front view showing the overall configuration of the first embodiment of the present invention.

FIG. 5 is a top view of FIG.

6 (A) and 6 (B) are a sectional view and an exploded perspective view showing a connecting structure between the lower ends of the upper and lower connecting fittings and the lower yoke fastening fitting in the embodiment of the present invention, respectively.

7 (A) and 7 (B) are a sectional view and an exploded perspective view showing another example of the connecting structure between the lower ends of the upper and lower connecting fittings and the lower yoke fastening fitting in the embodiment of the present invention.

FIG. 8A is an explanatory diagram for explaining the reason why the distance between the upper end of the winding and the upper yoke portion of the iron core becomes large in the conventional transformer. (B) is an explanatory view for explaining the reason why the distance between the upper end of the winding and the upper yoke portion of the iron core is reduced in the embodiment of the present invention.

FIG. 9 is a sectional view showing a main part of a second embodiment of the present invention.

FIG. 10 is an exploded perspective view showing a structure near a screw coupling mechanism used in the embodiment of FIG.

FIG. 11 is a cross-sectional view showing the main parts of a modification of the second embodiment of the present invention.

FIG. 12 is a cross-sectional view showing the main parts of a modification of the first embodiment of the present invention shown in FIG.

FIG. 13 is a sectional view showing a main part of a conventional transformer.

14 is an exploded perspective view showing a structure in the vicinity of a winding tightening device of the transformer shown in FIG.

FIG. 15 is a front view showing the overall configuration of a conventional transformer.

FIG. 16 is a perspective view schematically showing a structure of a conventional transformer and an iron core used in an embodiment of the present invention.

[Explanation of symbols]

 1 Iron Core 1a Upper Yoke Part 1b Lower Yoke Part 1c Leg Part 2 Winding 2a Primary Winding 2b Secondary Winding 11 Lower Winding Support Insulator 12 Upper Winding Support Insulator 21 Upper Yoke Tightening Bracket 22 Lower Yoke tightening fitting 23 Vertical connection fitting 26 Top connection fitting 29 Winding tightening bolt 30 Winding tightening nut 33 Mounting fitting 35 Winding tightening bolt 36 Winding tightening nut 38 Winding tightening bolt

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akira Matsumura 15 Ninotsubo, Terado-cho, Hyuga-shi, Kyoto Prefecture Within Kyoto Daihen Co., Ltd.

Claims (3)

[Claims] 1. An iron core having an upper yoke part and a lower yoke part and at least two legs arranged so as to straddle both yoke parts, and at least one of the legs of the iron core. 1 is arranged so as to face the installed winding and the upper yoke portion of the iron core, and the upper yoke portion is fastened in the laminating direction of the steel plates 1
A pair of upper yoke fastening members and a pair of lower yoke fastening members that are arranged so as to face each other with the lower yoke portion of the iron core interposed therebetween and fasten the lower yoke portion in the stacking direction; In a transformer comprising upper and lower connecting fittings respectively connecting between the pair of upper yoke tightening fittings and the corresponding lower yoke tightening fittings at positions corresponding to the legs, the upper yoke tightening fittings are: A screw connection mechanism is provided that is in contact with the upper end of the winding through a winding support insulator and that connects the upper yoke fastening fitting and the upper and lower coupling fittings on the upper end side of the upper yoke fastening fitting. The transformer, wherein the upper yoke tightening fitting is biased toward the winding side by tightening a screw of the screw connecting mechanism. 2. An upper surface connecting fitting for connecting between upper end portions of the pair of upper yoke fastening fittings is provided on an upper end side of the iron core, and the screw connecting mechanism is configured to connect the upper end of the upper and lower connecting fittings to the upper surface connecting fitting. The transformer according to claim 1, wherein the transformer is provided between the metal fitting and the metal fitting. 3. The screw connecting mechanism is provided between each upper end of the pair of upper yoke fastening fittings and the upper ends of the upper and lower connecting fittings corresponding to the pair of upper yoke fastening fittings, respectively. The transformer according to claim 1, wherein an upper surface connecting fitting is provided so as to connect between upper and lower connecting fittings respectively corresponding to the pair of upper yoke fastening fittings on an upper end side of the iron core.