JPS5814598Y2 - molded transformer - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a molded transformer configured by stacking a plurality of molded windings in the direction of the winding axis.

Conventional molded transformers have a relatively small transformer capacity and the winding shape is not very large, so the high voltage winding and the low voltage winding can each be constructed with a single molded winding.

However, recently there has been a demand for increased capacity of molded transformers, and as the transformer capacity increases, the winding becomes larger and it becomes necessary to divide the winding into a plurality of parts.

In other words, as the winding becomes larger, the amount of resin used during casting tends to increase, and when the amount of casting resin used in one time exceeds a certain amount, the pot life of the resin (the amount of resin used in casting) increases. The amount of time that can be used with sufficient liquidity.

) not only makes casting work difficult, but also makes it difficult to obtain a uniform hardening state during the curing process after casting, causing problems such as cracks occurring in the mold.

Therefore, when manufacturing a molded transformer with a large capacity, if the amount of casting resin used is large, the winding is divided into multiple molded windings in the axial direction, and these molded windings are stacked in the axial direction for assembly. things are being done.

However, if multiple molded windings are simply stacked, each molded winding will be deflected due to the forces acting on each molded winding in the radial and circumferential directions when the molded windings are transported while fitted onto the iron core. Otherwise, there is a risk that an unreasonable force may be applied to the molded portion and the molded portion may be partially damaged.

An object of the present invention is to provide a molded transformer with improved reliability during transportation.

The molded transformer of the present invention will be explained in detail below with reference to the illustrated embodiments.

Figure 1 shows an embodiment of the present invention, in which 1 is an iron core made of laminated steel plates, and 2, 2 are cross sections arranged to sandwich the upper and lower yoke parts of the iron core 1. 3 is a bolt that passes through the yoke clamping bracket 2.2 and the iron core 1, and 4, 4 is a direction in which the yoke clamping bracket 2, 2 is screwed together with the bolt 3 to draw the yoke clamping bracket 2, 2 toward each other. It is a nut that is tightened.

Low-voltage molded windings 5 and 6, which are divided into two in the radial direction, are fitted concentrically around the outer periphery of the legs of the iron core 1.

These low-voltage molded windings are made by molding winding conductors 5a and 6a with resins 5b and 6b, respectively.
Since these molded windings require less resin, they are not divided in the axial direction and are each a single molded winding.

A high-voltage molded winding 7 is arranged concentrically around the outer periphery of the outer low-voltage molded winding 6, and the upper and lower end surfaces of the low-voltage molded windings 5, 6 and the high-voltage molded winding 7 are connected to the upper and lower yoke fastening fittings 2.
, 2, a cushioning material 8 made of an elastic material such as rubber is arranged.

A large number of cushioning materials 8 are arranged radially around the legs of the iron core 1, and tightening bolts 9 are screwed into the upper yoke tightening fittings 2, 2.
, 9 . . . , the upper cushioning material 8 is pressed downward through the clamping plate 10, and the high and low pressure molded windings are clamped and fixed.

The high voltage molded winding 7 has three molded windings 71 in the axial direction.
It is divided into ~73.

These molded windings are high voltage windings 71a to 7, respectively.
3a is molded with resins 71b to 73b, and the molded winding 71 located at the top is provided with an outlet terminal portion 71C.

Further, winding end terminals 71 d and 7 are provided at the lower part of the molded winding 71, the upper and lower parts of the molded winding 72 located in the middle, and the upper part of the molded winding 73 located below.
2d, 72d' and 73d are provided, and the winding end terminals 71 d and 72 d and 72d' and 73 d are connected by the winding end connecting fittings 11.11', respectively, so that the molded windings 71 to 73 are connected to each other. connected in series.

Further, a concave-convex fitting portion consisting of a circumferential protrusion and a circumferential groove is provided at the abutting portion between the molded windings 71 and 72 and the abutting portion between the molded windings 72 and 73, respectively.

In this embodiment, as shown in FIGS. 2 and 3, an annular circumferential protrusion 72 e and a circumferential groove 72 f are provided on the upper and lower end surfaces of the mold portion of the mold winding 72, respectively. The lower end surface of the winding 71 and the upper end surface of the molded winding 73 are provided with the circumferential protrusion 72 e and the circumferential groove 72, respectively.
Annular circumferential groove 71 that fits with f and circumferential protrusion 7
3e is provided.

Further, in corresponding positions of the mutually abutting end surfaces of the mold windings 71 to 73, rotation locking pin engagement holes 7 that can be aligned with each other are provided.
0.70... is provided, and the corresponding rotation locking pin engagement holes 70 and 70 of the mutually abutting end surfaces of the mold windings adjacent in the winding axis direction are aligned. By engaging the rotation locking pin 12 across the engagement hole, rotation between adjacent mold windings in the direction of the winding axis is prevented.

In the illustrated example, the outer surface of each circumferential protrusion and the inner surface of each circumferential groove and rotation locking pin engagement hole are tapered. This is to facilitate release from the mold later.

Although not shown, heat-resistant rubber is provided between the lower end surface of the mold winding 71 and the upper end surface of the mold winding 72 and between the lower end surface of the mold winding 72 and the upper end surface of the mold winding 73, respectively. An annular packing consisting of etc. is arranged.

Then, with the molded windings 71 to 73 stacked up with packings interposed in each abutting portion, the upper end surface of each circumferential protrusion and the bottom surface of the circumferential groove in which each circumferential protrusion is fitted are connected. The height of each circumferential protrusion and the depth of the circumferential groove are set so that a small gap is formed between them.

With the above configuration, the concave-convex fitting portions provided at the abutting portions of adjacent mold windings can prevent each mold winding from being displaced in the radial direction, and the rotation locking pin can prevent the mold windings from being displaced in the radial direction. It is possible to prevent deviation due to rotation between the lines.

Since the concavo-convex fitting portion is constituted by the circumferential protrusion and the circumferential groove, it is possible to disperse the force acting on each mold winding in the circumferential direction and prevent excessive force from being applied locally.

In the embodiments described above, the positions of the circumferential protrusion and the circumferential groove of each concave-convex fitting part can be exchanged with each other.

For example, circumferential protrusions may be provided on the upper and lower end surfaces of the mold winding 72 located in the middle, and circumferential grooves may be provided on the lower end surface of the mold winding 71 and the upper end surface of the mold winding 73, respectively.

Further, the rotation locking pin may be inserted into the rotation locking pin insertion hole of one of the abutting end faces and fixed with an adhesive or the like, or it may be simply inserted. Optional.

As described above, according to the present invention, the uneven fitting portion consisting of the circumferential groove and the circumferential protrusion prevents each mold winding from shifting in the radial direction. It is possible to prevent the mold part from being damaged due to deviation of the wire or application of excessive force locally.

In particular, since the circumferential groove is annular, the force applied to the mating part can be made uniform, which prevents excessive force from being applied to the mating part due to vibrations during transportation and causing damage to the mating part. do not have.

In addition, holes were provided in the abutting end faces of adjacent mold windings, and a locking pin was inserted at the end to prevent rotation between the mold windings, so each mold winding could be electrically connected. No unnecessary force is applied to the winding end connection fittings to be connected, and the electrical connection state can be reliably maintained.

Furthermore, when assembling a molded transformer, positioning between the molded windings can be easily performed by simply inserting locking pins into holes provided in the abutting end faces of adjacent molded windings. As a result, it is possible to shorten the assembly work time and increase manufacturing efficiency.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional front view of an embodiment of the present invention;
2 is a plan view showing one of the molded windings used in the embodiment shown in FIG. 1, and FIG. 3 is a sectional view taken along the line III--III in FIG. 2. 1... Iron core, 5, 6... Low voltage molded winding, 7... High voltage molded winding, 70...
...Rotation locking pin attendant hole, 71-73...Mold winding, 71 f, 72 f...Peripheral groove,
72 e, 73 e...peripheral projection, 12...
...Rotation locking pin.

Claims (1)

[Scope of utility model registration request] A mold formed by stacking a plurality of molded windings in the direction of the winding axis, and electrically connecting the adjacent molded windings with a winding end connecting fitting with the end faces of the adjacent molded windings abutting each other. In the transformer, an uneven fitting portion consisting of an annular circumferential groove and a circumferential protrusion that fits into the circumferential groove is provided at the abutting portion of the end surfaces of the molded winding, and the abutting portions are abutted. A molded transformer characterized in that a locking pin for preventing rotation between adjacent molded windings is engaged in a hole provided in each end face.