JPS638096Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a transformer having concentrically arranged high voltage and low voltage coils.

[Technical background of the invention]

For example, a transformer with specifications for a large current on the low-voltage side, such as a transformer used as a power source for a chemical rectifier, has a high-voltage coil made up of multiple cylindrical coils and a low-voltage coil made of twin coils connected in parallel concentrically. There are transformers with external transformer coils.

The transformer coil provided in this transformer has the configuration shown in FIG. That is,
In the figure, 1 is a high-voltage coil, and 2 is a low-voltage coil arranged concentrically on the outer circumferential side of the high-voltage coil 1. The high-voltage coil 1 includes a plurality of duct pieces 5 arranged at intervals in the circumferential direction around an insulating tube 4 fitted to the legs of an iron core 3, and a cylindrical coil 6 in which a conductor is wound in a cylindrical shape.
are arranged concentrically and alternately. FIG. 2 shows the high voltage coil 1. On the other hand, low voltage coil 2
A plurality of insulating rails 8 are provided on the outer circumferential side of the insulating cylinder 7 at intervals along the coil axis direction, and each insulating rail 8 is engaged with an insulating spacer 9 to maintain intervals along the coil axis direction. A plurality of twin coils 10 are stacked with these insulating spacers 9 in between. As shown in FIG. 4, the insulating spacer 9 forms a long hole 9a and engages with the insulating rail 8. The twin coil 10 is a stack of two ring-shaped coils 11, 11, as shown in FIG.
In each twin coil 10, the outlet portions 11a, 11a of the ring-shaped coils 11, 11 are connected in parallel by a member (not shown), making it suitable for low voltage and large current. Insulating end rings 12 are provided at both ends of the low voltage coil 2. As shown in FIG. 5, an insulating sheet 13 is disposed on both ends of the high-voltage coil 1 and the low-voltage coil 2 between the yoke of the iron core 3 and a clamp (not shown).
A plurality of insulating end spacers 14 are arranged radially around the insulating tube 4 and fixed thereon.
This end spacer 14 has a flat plate shape, and is arranged between the end of the high voltage coil 1 and the end ring 12 of the low voltage coil 2.
The gap between these and the yoke portion of the iron core 3 and the clamp constitutes a passage. Note that the cooling medium such as oil in the tank flows as shown in the figure.

[Problems with background technology]

Thus, the high voltage coil 1 and the low voltage coil 2 are wound around the outside of the insulating tubes 4 and 7, respectively. The insulating cylinder 4 provided inside the high-voltage coil 1 is provided to insulate from the iron core 3, and to improve the strength of the high-voltage coil 1 since it has a cylindrical shape with low mechanical strength. The insulating cylinder 7 provided inside the low-voltage coil 2 is provided mainly for insulation from the high-voltage coil 1 because the low-voltage coil 2 has a disk shape with high mechanical strength. In this way, each coil 1, 2 is assembled separately with the insulating tubes 4, 7 provided inside, and the two are combined when assembling the transformer coil. In the process, they must be transported and processed separately, and assembly work is time-consuming. Furthermore, in order to keep the impedance of the transformer coil low, it is preferable to reduce the gap G between the high voltage coil 1 and the low voltage coil 2, but due to the presence of the insulating tube 7 of the low voltage coil 2, There is a limit to reducing the gap G. Furthermore, the end spacers 14 are bonded to the insulating sheet 13 to form refrigerant passages at both ends of the coil, but the work of positioning and gluing the end spacers 14 is also very time-consuming. .

[Purpose of invention]

The present invention aims to reduce the size of the winding by improving the holding structure for the winding, thereby providing a transformer that can cope with lower impedance and facilitate assembly work.

[Summary of the idea]

The transformer of the present invention has
A coil holder is provided that is fixed to the insulating rail for the low voltage coil and has a presser portion for holding down the high voltage and low voltage coils respectively, thereby eliminating the need for an insulating tube and an end spacer for the low voltage coil.

[Example of idea]

An embodiment of the present invention shown in the drawings will be described below.

FIGS. 6 and 7 show an embodiment of the transformer of the present invention, with FIG. 6 showing the transformer coil and FIG. 7 showing the coil holder, respectively. In the drawings, parts that are the same as those in FIGS. 1 to 3 are designated by the same reference numerals, and explanations thereof will be omitted.

In the figure, reference numeral 15 denotes coil holders arranged radially at both ends of the high-voltage coil 1 and the low-voltage coil 2, and are made of synthetic resin.
As shown in FIG. 7, the coil holder 15 includes a high-voltage coil holding part 15a in the form of a horizontally long plate with a predetermined thickness (thickness of the end spacer 14), and a high-voltage coil holding part 15a that is continuous with the high-voltage coil holding part 15a and has a predetermined height. A low voltage coil holding part 15b is formed into a rectangular parallelepiped with a height (height of the end ring 12), and a groove is formed along the height direction of the low voltage block 15b at the boundary between these holding parts 15a and 15b. It has a block shape in which the insulating rail 8 and the engaging portion 15c are integrally molded. A plurality of coil holders 15 are arranged radially at intervals in the circumferential direction between both ends of the high-voltage and low-voltage coils 1 and 2 and the yoke portion of the iron core 3, with the insulating cylinder 4 as the center. in this case,
The engaging portion 15c of the coil holder 15 is connected to the low voltage coil 2.
The coil holder 15 is positioned and fixed by being inserted and engaged with both ends of the insulating rail 8 provided at the coil holder 15 . The high voltage coil holding part 15a of the coil holder 15 holds both ends of the high voltage coil 1 over the entire radial direction, and the low voltage coil holding part 15b holds down both ends of the low voltage coil 2 over the entire radial direction.
Moreover, each coil holding part 15a, 15b forms a gap for a refrigerant passage between both ends of each coil 1, 2 and the yoke part of the iron core 3. The high voltage coil holding part 15a corresponds to the conventional end spacer 14, and the low voltage coil holding part 15b corresponds to the end spacer 14 and the end ring 1.
Corresponds to 2. The coil holder 15 is disposed at both ends of the high-voltage and low-voltage coils 1 and 2, and its rear side abuts against the insulating spacer 13 for the iron core 3. In addition, 16 in the figure is a cylindrical insulating sheet placed between the high voltage coil 1 and the low voltage coil 2. This is formed of a thin insulating sheet such as a press board, and the insulation sheet between both coils 1 and 2 is made of a thin insulating sheet such as press board. We are trying to In this way, the coil holder 15 is securely fixed by engaging with the insulating rail 8, and at the same time, the low-voltage coil holding part 15b directly presses both ends of the low-voltage coil 2, so that the low-voltage coil can be coiled without using the insulating tube 7. 2 can have sufficient mechanical strength, and the insulating cylinder 7 can be made unnecessary. Therefore, since the gap G between the coils 1 and 2 can be made small, the impedance of the transformer can be kept low.

In assembling the transformer coil, first, the cylindrical coil 6 is wound around the insulating cylinder 3 via the duct piece 5, and the insulating sheet 16 is wound around the outer circumference of the cylindrical coil 6. An insulating rail 8 is provided on the outer circumferential side of the insulating sheet 16.
are placed upright, the lower coil holder 15 is set, and then the twin coils 10 are stacked together with the insulating spacers 9. Finally, the upper coil holder 15 is set. The high-voltage coil 1 and the low-voltage coil 2 can be assembled together, and subsequent operations such as drying and insertion into the iron core can be performed on both coils 1 and 2 at the same time. Further, the troublesome work of attaching the coil holder 15 to the insulating sheet 13 is not necessary.

[Effect of idea]

As explained above, the transformer of the present invention eliminates the need for the insulating tube of the low voltage coil, reduces the gap between the high voltage coil and the low voltage coil, and can cope with lower impedance, as well as the space factor in the transformer tank. In addition, the workability of assembling transformer coils is greatly improved.

[Brief explanation of the drawing]

1 to 5 show an example of a conventional transformer, FIG. 1 is a cross-sectional view showing a transformer coil, FIG. 2 is a perspective view showing a high-voltage coil, and FIG. 3 is a perspective view showing a low-voltage coil. Fig. 4 is a perspective view showing the insulating spacer and insulating rail provided on the low voltage coil, Fig. 5 is a plan view showing the insulating sheet and the end spacer, and Figs. 6 and 7 show an embodiment of the transformer of the present invention. 6 is a sectional view showing the transformer coil, and FIG. 7 is a perspective view showing the rail holder. 1...High voltage coil, 2...Low voltage coil, 3...
Iron core, 4...Insulation tube, 5...Duct piece, 6...
... Cylindrical coil, 7 ... Insulation tube, 8 ... Insulation rail, 9 ... Insulation spacer, 10 ... Twin coil (ring-shaped coil), 13 ... Insulation sheet, 14 ...
...End spacer, 15...Coil holder, 15a
...High voltage coil holding part, 15b...Low voltage coil holding part, 15c...Engaging part, 16...Insulating sheet.

Claims (1)

[Scope of utility model registration request] A transformer coil is provided in which a high-voltage coil consisting of a cylindrical coil and a low-voltage coil consisting of a plurality of ring-shaped coils stacked on top of each other with an insulating rail provided in the axial direction of the coil and a plurality of ring-shaped coils stacked via insulating spacers supported by the insulating rail are arranged concentrically. A plurality of coil holders made of an insulating material are arranged radially on both ends of the high-voltage coil and the low-voltage coil, and each of the coil holders has a high-voltage coil holding part and a low-voltage coil holding part, respectively. A transformer having an engaging portion that engages with a rail.