JPH03209804A - Manufacture of resin-molded coil - Google Patents

Abstract

PURPOSE:To unnecessitate the use of spacers, to enhance workability, and to prevent generation of cracks by a method wherein an inner cylinder is constituted in an elastic manner, and a protruding part, to be used to retain block coils at prescribed intervals, is formed on the circumference of the inner cylinder. CONSTITUTION:An inner cylinder 12 is erastically constituted, protrusions 17a and 18a are formed on the outer circumference of the inner cylinder 12 in order to support block coils 20a to 20d at prescribed intervals, and a plurality of coil blocks 20a to 20d are fixed to the outer circumference of an insulating layer 19. The above-mentioned protrusions 17a and 18a are positioned between the block coils 20a to 20d, and resin is molded in the above-mentioned state. As a result, the use of spacers for positioning and retention of the block coils 20a to 20d is unnecessitated, workability can be improved, and the generation of exfoliation and cracks can also be prevented.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention includes a plurality of block coils.

The present invention relates to a method of manufacturing a resin molded coil in which resin molding is performed using inner and outer cylinders disposed on the outside as molds.

(Prior Art) Conventionally, a plurality of block coils are arranged on the outer periphery of an inner cylinder of a mold, an outer cylinder is arranged outside the inner cylinder, and among the block coils,
Japanese Utility Model Publication No. 53-39755 discloses a method of manufacturing a resin molded coil by vacuum-pressure casting an insulating resin between outer cylinders, that is, on the outer periphery of a block coil. That is, as shown in FIG. 6, block coils 2a,
2b and 2C, spacers 3, 3 are interposed between the outer circumference of the inner cylinder 1 and the upper and lower ends of the block coils 2a and 2C, and the outer circumference of the inner cylinder 1 and the block coil 2
Spacers 4, 4 are interposed between a, 2b and 2c.

As shown in FIG. 7, the spacers 3 and 4 are arranged at eight locations along the circumferential direction of the inner cylinder 1. These spacers 3 and 4 are molded from the same resin as the insulating resin 5, and their surfaces are textured to improve the degree of adhesion to the insulating resin 5. Then, an outer cylinder 6 is placed on the outside of these.
and end plates 7, 7 are disposed, vacuum is drawn in this state, insulating resin 5 is injected, and resin molded coil 8 is manufactured.

(Problems to be Solved by the Invention) In the above-described manufacturing method, a total of 32 spacers 3.4, 8 in one location, are used to hold the block coils 2a, 2b, and 2C in the inner cylinder 1 forming the mold. Therefore, it takes a lot of man-hours to process the surface of spacers 3 and 4.
Furthermore, there is a problem that attaching the spacer 3.degree. 4 to the mold is troublesome. Additionally, if oil from your hands or the like gets on the surface of the spacers 3 and 4 while they are being handled, the adhesion between the spacers 3 and 4 and the insulating resin 5 will be insufficient, and peeling and cracks will occur at the interface between them. The problem is that it is easy to do.

The present invention has been made in view of the above circumstances, and its purpose is to provide a resin molded coil that does not require the use of spacers to position and hold the block coil, has excellent workability, and can prevent peeling and cracking. To provide a manufacturing method.

[Configuration of the Invention (Means for Solving the Problems) The method for manufacturing a resin molded coil of the present invention includes arranging a plurality of block coils on the outer periphery of an inner cylinder with an insulating layer interposed therebetween,
An outer cylinder is arranged outside of these block coils, and an insulating resin is injected between the inner and outer cylinders, and the inner cylinder is configured to be expandable and contractible, and the block coil is placed on the outer periphery of the inner cylinder. forming protrusions for holding at predetermined intervals, expanding the inner cylinder to fix the plurality of block coils to the outer periphery of the insulating layer, and positioning the protrusions between the block coils; The feature is that resin molding is performed in this state.

(Function) In the method for manufacturing a resin molded coil of the present invention, when injecting the insulating resin, the expandable inner cylinder is expanded and the protrusions are positioned between the block coils, so that the plurality of block coils are connected to the insulating layer of the inner cylinder. This eliminates the need to use spacers as in the past.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

First, in FIGS. 1 and 3, the mold 11 includes a two-part inner cylinder 12, an outer cylinder 13 disposed on the outer periphery of the inner cylinder 12, and an outer cylinder 13 and an inner cylinder 12. Packing 14.14 and end plates 15, 15 addressed to the upper and lower end surfaces
An injection port 16 is formed in the upper gasket 14. As shown in FIG. 3, the inner cylinder 12 is made up of U-shaped frame members 17 and 18 that are movable in the radial direction so that their side parts overlap, and a plurality of frame members 17 and 18 are formed on the outer circumference along the axial direction. For example, five semicircular protrusions 17a and 18a each having a diameter of 2 to 8 mm are formed at equal intervals by press molding. A high-strength fiber material such as glass net is wrapped around the outer circumference of the inner cylinder 12 to form an insulating layer 19.
are formed, and four block coils 20a to 20d are arranged at intervals of 4 to 10 mm on the outer periphery of this insulating layer 19, and a high-strength material such as a glass net is placed on the outer periphery of these block coils 20a to 20d. A fiber material is wound to form an insulating layer 21. The thickness of the insulating layers 19 and 21 is 2 to 5 mm in the case of 6KV class high voltage equipment.

Now, in FIG. 3, the expansion/contraction device 24 includes backing plates 25 and 26 attached to the inner surfaces of the frame members 17 and 18 of the inner cylinder 12, and a right-handed screw portion 27 with one end attached to the backing plate 25. , a left-handed threaded portion 2 with one end attached to the backing plate 26
8, and a nut portion 29 that is screwed into the other end portions of the right-hand threaded portion 27 and the left-hand threaded portion 28.

Next, the procedure for manufacturing the resin molded coil 23 using the E1 insulating resin 22 will be explained.

By rotating the nut portion 29 of the telescoping device 24 in the direction of arrow A, the frame members 17 and 18 are opened as shown in FIG.
are brought closer to each other to reduce the diameter of the inner cylinder 12. Then, an insulating layer 19 is formed on the outer periphery of the inner cylinder 12. Thereafter, a block coil 20 is attached to the outer periphery of the insulating layer 19 in the inner cylinder 12.
Place a to 20d. In this case, the tip of the arc portion 19a of the insulating layer 19 does not contact the inner diameter portions of the block coils 20a to 20d. Therefore, block coil 2Qa~
20d is temporarily held by a jig (not shown),
By rotating the two nut portions of the telescoping device 24 in the opposite direction of arrow A, the frame members 17 and 18 are separated and the inner cylinder 12
, thereby extending the protrusions 17a and 18 of the inner cylinder 12.
a is located between the block coils 20a to 2Od, and the arc portion 19a of the insulating layer 19 abuts the inner diameter portion of the block coils 20a to 20d to hold each block coil 20a to 20d at a predetermined interval. And block coil 20a~
An insulating layer 21 is formed on the outer periphery of the outer cylinder 13 and the packing 14. The end plate 15 is attached and the mold 11 is assembled. Then, after pre-drying, insulating resin 22 is injected from injection port 16, and when insulating resin 22 is cured, mold 11 is removed, and resin molded coil 23 is manufactured.

According to the above embodiment, the following effects are achieved. That is, when the block coils 20a to 20d are arranged on the outer periphery of the inner cylinder 12 and the inner cylinder 12 is expanded by operating the expansion/contraction device 24 to position the protrusion 15 between the block coils 20a to 2Od, the insulating layer The arc portions 19a of 19 are in contact with the inner peripheral portions of the block coils 20a to 20d, and each block coil 2
Since 0a to 20d are positioned and held at predetermined intervals, the casting operation becomes extremely easy. Further, since the conventional spacer 3.4 is not required to hold the block coils 20a to 20d, surface processing thereof becomes unnecessary, and peeling of the insulating resin 22 is eliminated.

It can prevent the occurrence of cracks. Moreover, when the resin molded coil 23 is assembled into the core leg, the four parts formed on the opposite side of the arcuate part 19a of the insulating layer 19 serve as flow paths for the cooling medium, so that the cooling effect is improved.

Note that the present invention is not limited to the above-mentioned embodiment, and for example, a cylindrical inner cylinder may be used instead of the rectangular inner cylinder 12, and the protrusion 17a.

Instead of 18a, as in another embodiment shown in FIG.
Various modifications are possible without departing from the gist, such as forming the protrusion 30 by attaching it to the outer periphery of.

[Effects of the Invention] As is clear from the above description, the method for manufacturing a resin molded coil of the present invention is such that a plurality of block coils are positioned and held at predetermined intervals without using a spacer. Therefore, it has excellent workability and is effective in preventing peeling and cracking.

[Brief explanation of drawings]

1 to 4 show one embodiment of the present invention, in which FIG. 1 is a front view with the right half cut away, FIG. 2 is a view equivalent to FIG. 1 before casting, and FIG. 4 is a perspective view of the resin molded coil, FIG. 5 is a view corresponding to FIG. 2 showing another embodiment of the present invention, and FIG. 6 is a view of the conventional example. A view corresponding to FIG. 1 and FIG. 7 are top views of the same resin molded coil. In the figure, 1] is a mold, 12 is an inner cylinder, 13 is an outer cylinder, 17 and 18 are frame members, 17a and 18a are protrusions, 19 is an insulating layer, 20a to 20d are block coils, 22 is an insulating resin, 24 is a telescopic device, and 30 is a protrusion.

Claims (1)

[Claims] 1. Multiple block coils are placed on the outer periphery of the inner cylinder with an insulating layer interposed between them, an outer cylinder is placed outside these block coils, and insulating resin is injected between the inner and outer cylinders. The inner cylinder is configured to be expandable and retractable, and a protrusion for holding the block coils at a predetermined interval is formed on the outer periphery of the inner cylinder, and when the inner cylinder is expanded, the plurality of block coils are connected to the insulator. A method for manufacturing a resin molded coil, characterized in that the protrusion is fixed to the outer periphery of the layer, the protrusion is located between the block coils, and resin molding is performed in this state.