JPS6239529B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a method for manufacturing a resin molded transformer, in which the contents of the transformer, in which a coil is wound around an iron core, can be fixedly supported and incorporated into a mold without deviation. .

[Technical background of the invention and its problems]

When the contents of a transformer are assembled into a mold and molded with resin, the contents of the transformer are kept at a predetermined distance from the inner wall of the mold in order to form a mold resin layer of a predetermined thickness around the contents of the transformer. be incorporated. Spacers were generally used as a means to maintain this distance, but not only did it take time to manufacture and insert the spacers, but even after the contents of the transformer were assembled into the mold, vibrations and pressure during resin injection could occur. There was a risk that the resin layer would be unable to form a predetermined thickness on the inside of the transformer, resulting in poor insulation.

On the other hand, in the case where only the coil is resin-molded, a method has been proposed in which a core inside the coil is used and a protrusion is provided on the inside or at the end in the axial direction to maintain the spacing. However, in the case where the iron core is combined with the coil and resin molded, the iron core exists inside the winding core, and the iron core is provided so as to be interlinked with the coil. It is difficult to adequately support it. In particular, in the case of an external iron type transformer in which a coil is wound around the adjacent legs of two iron cores placed side by side, separate iron cores are located on both sides of the coil.
The structure for holding these two cores has become complicated.

[Purpose of the invention]

The present invention has been made in consideration of the above points, and
The purpose of this is to facilitate the positioning and assembly of the transformer contents, and to facilitate the formation of the transformer contents when the transformer contents, in which coils are wound around the adjacent legs of two juxtaposed iron cores, are assembled into the mold. To provide a method for manufacturing a resin mold transformer with stable quality, which can accurately form a molded resin layer without thickness deviation.

[Summary of the invention]

According to the present invention, in order to achieve such an objective,
An insulating support member is provided, which has a pair of recesses having a size in which a corner part of the iron core is fitted on one surface, a projection located between the pair of recesses, and a projection on the other surface, This insulating support member is attached to each of the axially opposite sides of the coil inside the transformer so that the pair of recesses fit into the corner parts of each of the iron cores, and the convex part fits between the corner parts of both iron cores. By assembling the contents of the transformer into the mold such that the projections of each insulating support member fit into the holes drilled in the inner wall of the mold, positioning and assembling the contents of the transformer are easy and easy to form. It is characterized by being able to accurately form a molded resin layer without unevenness in thickness.

[Embodiments of the invention]

An embodiment of the method for manufacturing a resin molded transformer according to the present invention will be described below with reference to the drawings. In FIG. 1, a primary coil 11 and a secondary coil 12 are wound around the outer periphery of a winding core 13 with an inter-coil insulating member 10 interposed therebetween. And inside the winding core 13 of this coil, there are 2
Insert one leg of each of the cores 14 and 15 divided into two parts, and place the cores 14 and 15 together by gluing the joints of the core division surfaces or individually tightening and fixing them with a tightening band (not shown). The contents of the transformer include coils commonly wound around the adjacent legs of two iron cores 14 and 15. Note that an insulating member 16 (see FIG. 4) is inserted to maintain an appropriate distance between the winding core 13 and the iron cores 14 and 15. Then, an insulating support member 21 is attached to the inside of the transformer.

As shown in FIG. 2, the insulating support member 21 has recesses 22a and 2 made of synthetic resin such as epoxy resin and having a size in which a part of the iron core is fitted on one surface.
A convex portion 22c is formed between the concave portions 2b and the concave portions 22a and 22b, and protrusions 23a and 23b are formed at the edge of the opposite surface.

The insulating support member 21 is attached so that a pair of recesses 22a and 22b fit into the corners of the cores 14 and 15 located on both sides of the coil in the axial direction, and a protrusion 22c fits between the corner portions.

Then, as shown in FIGS. 3 and 4, the contents of the transformer with the insulating support member 21 attached are molded into a mold 19.
Incorporate within. In this case, the protrusions 23 of the insulating support member 21 attached to both sides of the iron cores 14 and 15, respectively.
a and 23b are inserted into holes 24a and 24b formed in the inner wall of the mold 19, respectively. The sizes and positions of these protrusions 23a, 23b and holes 24a, 24b are selected so that the molded resin layer covering the contents of the transformer can maintain a predetermined insulation dimension after molding, which will be described later. After the contents of the transformer are incorporated into the mold 19 in this manner, a mold resin 1 made of synthetic resin such as epoxy resin or polyester resin is poured from an injection port (not shown).
7 is injected, left at room temperature or cured by heating, and then released from the mold to produce a resin molded transformer.

In this way, the insulating support member 21 can be
The insulating support member 2 can be attached to the inside of the transformer by simply inserting it into the opposing corners of the parts 4 and 15.
All that is required is to insert the projections 23a, 23b of 1 into the holes 24a, 24b of the mold 19. Therefore, the work of assembling the contents of the transformer into the mold 19 becomes easy, and each core 14, 15 has corner portions facing each other on both sides in the coil axial direction that fit into the mold 19.
Recesses 22a, 2 of insulating support member 21 fixed to
2b and a convex part 22c fitted between the corner parts, it is firmly fixed.
It does not shift in either the left or right direction.

〔Effect of the invention〕

As explained above, according to the method of manufacturing a resin molded transformer of the present invention, when assembling the contents of an outer iron type transformer into a mold, it is easy to position and assemble the contents of the transformer. Since the contents of the transformer do not move due to vibrations, resin injection pressure, etc. even after the molding, it is possible to manufacture a resin molded transformer having a molded resin layer of a predetermined size without uneven thickness.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the contents of the transformer before it is assembled into a mold in the method for manufacturing a resin molded transformer according to the present invention, FIG. 2 is a perspective view showing an insulating support member used in the method of the present invention, FIG. FIG. 4 is a plan sectional view and a side sectional view showing the state in which the contents of the transformer are assembled into a mold and resin molded in the method of the present invention. 11...Primary coil, 12...Secondary coil, 1
3... Core, 14, 15... Iron core, 17... Resin, 19... Mold, 21... Insulating support member, 22a, 22b... Concave portion, 22c... Convex portion,
23a, 23b... protrusion, 24a, 24b...
hole.

Claims (1)

[Claims] 1 The contents of a transformer are formed by winding a coil commonly around the adjacent legs of two iron cores arranged in parallel, the contents of this transformer are assembled into a mold, and after injecting resin into the mold, this In a method of manufacturing a resin molded transformer made by hardening a resin, a pair of recesses having a size to fit a corner portion of an iron core and a convex portion located between the pair of recesses are formed on one surface. and an insulating support member having a protrusion formed on the other surface thereof, and the insulating support member is provided on each of both sides in the axial direction of the coil inside the transformer, and a pair of recesses are fitted into corner portions of each of the iron cores, and The transformer is mounted so that the protrusions are fitted between the corners of both iron cores, and the contents of the transformer are inserted into the mold by fitting the protrusions of each of the insulating support members into holes made in the inner wall of the mold. A method for manufacturing a resin mold transformer, characterized in that it is incorporated into a resin mold transformer.