JPH08162342A - Transformer insulator and its assembling method - Google Patents

Abstract

PURPOSE: To obtain a transformer insulator with which a flat plate and a plurality of spacers, which are arranged on the flat plate, can be assembled reliably and the positional deviation and the exfoliation of the spacers can be prevented without changing the fundamental efficiency of the insulator. CONSTITUTION: Holes 21a or protrusions are formed on a spacer 21 without changing the substrate structure of an insulator, protrusions or holes are formed on a flat plate 11 on the position corresponding to the above-mentioned holes and protrusions, the spacer 21 and the flat plate 11 are assembled in such a manner that the holes and the protrusions are fitted and that the assembled spacers are not positionally deviated and also the spacers are not positionally deviated or exfoliated. Also, a bubble-expelling groove or a through hole is formed in such a manner that it is connected to the holes 21a formed on the spacer 21, and the deterioration in efficiency as an insulator is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulator composed of a flat plate of an insulator arranged between windings in a transformer and a plurality of spacers arranged on the flat plate.

[0002]

2. Description of the Related Art As a general structure of this type of insulator common to the prior art and the present invention, a flat plate 1 and a plurality of spacers 2 arranged on the flat plate 1 are provided as shown in FIG. A structure is adopted in which a sheet material is cut to produce a flat plate 1 and a spacer 2 having a predetermined shape, and the flat plate 1 and the spacer 2 are assembled. Then, the coils wound in a race track shape and the insulator having the structure of FIG. 13 are alternately laminated to form a transformer winding.

As a conventional assembling method, there is an assembling method in which an adhesive is applied to each of the flat plate 1 and the spacer 2 and they are adhered to each other.

Further, as a conventional insulator structure,
Japanese Utility Model Publication No. 55-42332 and Japanese Utility Model Publication 55-13.
Japanese Patent No. 7530 is known. The former one is intended to obtain an insulator having an integral structure by previously forming the spacer and the flat plate integrally with each other and compression-molding the whole. In the latter case, similar to the former case, the part that becomes the spacer and the flat plate are integrally formed in advance, and the flat plate is compression-molded while leaving the part that conforms to the spacer shape. It is a molding device to be obtained.

[0005]

In the conventional insulator structure, since the flat plate 1 or the spacer 2 is assembled by applying an adhesive, the assembled spacer 2 may be displaced by the time the adhesive is cured. However, there is a problem in that the spacer 2 is easily displaced or peeled off by an external force even after the adhesive is cured.

[0006] In addition, the actual development No. 55-42332 and the actual development No. 5
In No. 5-137530, a portion to be a spacer and a flat plate are integrally formed in advance, and compression molding is performed to obtain an insulator having an integral structure in which the spacer is formed on the flat plate. In the structure of the insulator in this configuration, since the insulator having an integral structure is compression-molded, a mold for molding is large and a mold having a shape corresponding to the spacer pattern is required. Therefore, there is a problem that the manufacturing equipment for compression molding becomes expensive and the manufacturing cost becomes high.

Further, since the flat plate portion has a higher degree of compression molding than the spacer portion, the strength can be increased, but the spacer portion has a lower strength in the compression direction than the flat plate portion,
When assembled as an insulator of a transformer, problems such as deformation of the insulator due to compressive force in the stacking direction of the transformer are expected.

The present invention has been made in order to solve the above-mentioned conventional drawbacks, and it is possible to surely assemble a flat plate and a plurality of spacers arranged on the flat plate by a simple method, and after the assembling, the spacer and the flat plate are assembled. It is an object of the present invention to provide a transformer insulator that does not shift or peel off, and a method for assembling the insulator.

[0009]

According to the invention of claim 1, a hole is provided in one of the flat plate and the spacer, and a projection is provided in the other, and the flat plate and the spacer are assembled by fitting the hole and the projection, so that it is simple. It can be assembled by manufacturing equipment,
Moreover, there is no displacement or peeling. Moreover, the performance as an insulator is about the same as the conventional one.

According to a second aspect of the present invention, in addition to the first aspect of the invention, the holes and the projections have a circular cross section, and at least 2
Since individual holes or protrusions are provided and positioned in one spacer, positional deviation is unlikely to occur and assembly can be performed with simple manufacturing equipment.

According to the invention of claim 3, in addition to the invention of claim 1, the cross-sectional shape of the hole and the projection is made non-circular, so that the positional deviation is eliminated by providing only one hole or projection in the spacer. It can be assembled with simple manufacturing equipment.

According to the invention of claim 4, in addition to the invention of claim 1, since a groove communicating with the hole is provided, when the insulating oil is injected into the transformer, the air between the hole and the protrusion forms a groove. Since it passes through and passes through, it is possible to prevent air from staying in the insulating oil and causing defective insulation. Also, it can be assembled by simple manufacturing equipment.

According to a fifth aspect of the present invention, a spacer is formed by fitting a plurality of insulating spacer bodies on one side on a single insulating sheet and a projection provided on the other side to fit them together to form a spacer. Since the insulating sheet of was adhered to the flat plate, the spacer body was preassembled on the continuous insulating sheet,
Since it suffices to cut the insulating sheet into an appropriate length and adhere it to the flat plate, the fitting process is simpler and the handling is easier than directly fitting the spacer body on the flat plate.

According to the sixth aspect of the present invention, one of the flat plate and the spacer is provided with a hole, and then the other is arranged so as to face the hole to form a protrusion at a position corresponding to the hole, and at the same time, fit the hole and the protrusion together. Therefore, the formation and fitting of the protrusions are completed in one step, and the manufacturing is simplified.

According to the invention of claim 7, in addition to the invention of claim 6, the outer diameter of the caulking punch for forming a projection and fitting in the hole is made smaller than the outer diameter of the punch for forming the hole. Will be easier.

According to the invention of claim 8, in addition to the invention of claim 6, the adhesive is applied to the flat plate or the spacer after the holes are provided and before the projection is formed. Assembly is more secure.

[0017]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to FIGS.
Description will be given based on the configuration diagram of the insulator and the assembling method shown in FIG.

As shown in FIG. 1, first, the spacer 21 is set on the positioning plate 3, and the tip portion thereof has a circular shape.
The punch 4 of the book is pressed by means such as a press (not shown) to form two round recesses 21a to be holes in the spacer 21. Next, as shown in FIG. 2, the flat plate 11 is set on the side of the spacer 21 where the concave portion 21a is formed, and the tip end portion has a round shape at the same position as the concave portion 21a previously formed in the spacer 21. The caulking punch 5 of the book is pressed by means such as a press (not shown) to form a convex portion 11a which becomes a protrusion on the flat plate 11, and at the same time, the convex portion 11a is pushed into the concave portion 21a of the spacer 21 to form the convex portion 1 of the flat plate 11.
1a and the recess 21a of the spacer 21 are fitted to each other, and the flat plate 11
Assemble the spacer 21.

When the assembly of one spacer 21 to the flat plate 11 is completed, the next spacer 21 is set on the positioning plate 3 and
By repeating the above operation, the assembly of all the spacers 21 to the flat plate 11 is completed. The flat plate 11
In order to assemble the spacers 21 at the predetermined positions, when the assembly of one spacer 21 is completed and then the assembly of the next spacer 21 is performed, even if the flat plate 11 is moved in the plane, the positioning for forming the concave portion of the spacer 21 is performed. The method of moving the plate 3 is not limited.

The recess 21a of the spacer 21 and the flat plate 1
One spacer 2 is provided at a place where the convex portion 11a of 1 is fitted.
Although it is formed in two places with respect to No. 1, since the shape of the fitting portion is circular, after assembling the spacer 21 and the flat plate 11, if the fitting portion is in one place, the spacer 21 is subjected to external force or the like. Will rotate and be displaced. In order to prevent this, one spacer 21 is formed with two or more fitting portions.

Further, the outer diameter of the caulking punch 5 at the tip end thereof is set to be about 5 to 10% smaller than the outer diameter of the punch 4 which forms the recess 21a in the spacer 21, so that the recess and the protrusion are properly formed. The fitting force is obtained. However, how to make the outer diameter of the crimping punch 5 smaller than the outer diameter of the punch 4 depends on the thickness of the flat plate. It is not limited. As the flat plate 11 and the spacer 21, paper or other insulating material can be used.

Example 2. In addition, when forming a recess in the spacer, the escape groove 21b as shown in FIG.
By forming the through hole 21c as shown in Fig. 2 by another forming punch (not shown), the spacer 21 and the flat plate 11 which have been assembled are assembled into the transformer, and then the insulating oil is injected into the transformer. At this time, the air existing between the concave portion of the spacer 21 and the convex portion of the flat plate 11 becomes
By passing through b or the through hole 21c, air does not accumulate in the insulating oil and a problem such as insulation failure does not occur. 3 and 4, the upper part is a plan view and the lower part is a cross-sectional view.

In the structure in which the through hole 21c or the escape groove 21b is formed in the spacer 21, in addition to the method of forming by another forming punch, the recess 21 in the spacer 21 is formed.
A punch 4a is formed so that the through hole 2c or the escape groove 2b can be formed at the tip of the punch 4 forming a, and the through hole 2c is formed at the same time when the recess 2a is formed in the spacer 2.
Alternatively, the escape groove 2b may be formed.

Example 3. In addition, the flat plate 11 and the spacer 21
In order to improve the assembly strength of the flat plate 11, the adhesive is applied to either the spacer 21 or the flat plate 11 before fitting the convex part 11a of the flat plate 11 into the concave part 21a formed in the spacer 21. The spacer 21 may be assembled. The combination of the flat plate 11 and the spacer 21 becomes stronger.

Example 4. The holes formed in the spacer 21 may be through holes as shown in FIG. Figure 5 shows punch 4
The spacer 21 is punched out to form the through hole 21d. The positioning plate 3 in a region corresponding to the through hole 21d is provided with a discharge hole for the punched work.
FIG. 6 shows a state in which a protrusion 11a serving as a protrusion is formed on a flat plate and fitted into the through hole 21d of the spacer. Spacer 21
This step is carried out in exactly the same way as in FIG. 2 except that the holes in FIG.

As described above, by repeating the operation of fitting the convex portion 11a of the flat plate 11 into the concave portion 21a formed in the spacer 21 and assembling a predetermined number of spacers 2 on one flat plate 11, The individual insulator 61 is completed. The insulator 61 thus completed is shown in FIG.
As shown in FIG. 6, as the insulator 61 between the coils 8 of the transformer 7, the laminated winding of the transformer 7 is assembled by alternately assembling the coils 8 and the insulator 61 according to a predetermined stacking order. Next, the laminated coil 8 and insulator 6
1 is clamped from the stacking direction by a pressing metal plate not shown, and then assembled in a storage box of the transformer 7 not shown. Finally, insulating oil is injected into the storage box to complete the assembly work of all the transformers 7.

According to the insulator 61 thus constructed, the spacer 21 and the flat plate 11 can be reliably assembled without changing the performance of the conventional insulator, and the assembled spacer 21 is displaced. Even after the adhesive is hardened, the spacer 21 is not easily displaced or peeled off by an external force, and the manufacturing cost can be further reduced.

Example 5. In the above embodiment, the spacer 21
After assembling the flat plate 11 and the flat plate 11, there is shown one in which two or more fitting portions are formed for one spacer 21 so that the spacer 21 does not rotate and shift due to external force or the like. The present invention is not limited to this, and as shown in FIG.
Even if each of the protrusions 1 has a polygonal shape or other non-circular shape and only one fitting portion is formed for one spacer 21, the spacer 21 does not rotate due to an external force. The insulator 61 of the transformer can be obtained.

Example 6. In the above embodiment, the spacer 21
Although the hole 2a is formed on the flat plate 11 and the projection 1a is formed on the flat plate 11, the present invention is not limited to this, and the flat plate 11 may be reversed depending on the thickness of the spacer 21 and the flat plate 11. The same effect can be expected by forming a hole in the hole and forming a protrusion in the spacer 21. Flat plate 11 from spacer 21
This method can be used when the thickness is thicker or similar.

In FIG. 9, a flat plate is placed on the positioning plate 3,
A step of applying pressure by the punch 4 to form the holes 11b will be described. Next, as shown in FIG.
The protrusion 21e is formed on the spacer 21 by the caulking punch 5 and the protrusion 21e is formed at the same time as the hole 11 of the flat plate.
Fit in b.

Example 7. In the above embodiment, the spacer 21
Although the projections or holes of the flat plate 11 are directly fitted into the holes or projections of No. 1 to assemble, the present invention is not limited to this, and as shown in FIG.
In the same manner as the above, the spacer body 22 is assembled in advance by fitting the holes and the projections to the continuous insulating sheet 9, and the insulating sheet 9 is cut into a predetermined length and adhered to the flat plate 11 or as in Example 1. Similar effects can be expected even if they are assembled by the same method.

In FIG. 12, a plurality of spacer bodies 22 are fitted to the insulating sheet 9 to form a spacer.
FIG. 3 is a perspective view showing a state in which is bonded to a racetrack-shaped flat plate 11. Although two insulating sheets are representatively shown in the drawing, a large number of insulating sheets are actually provided over the entire circumference of the flat plate 11, and when viewed from above, it looks like FIG.

This embodiment has an advantage that the alignment process and the fitting process are simpler than those of the other embodiment in which the spacer is directly fitted to the racetrack-shaped flat plate 11 to assemble. Since the insulating sheet 9 has a larger area than the spacer main body 22, the bonding area with the flat plate 11 can be sufficiently widened, and therefore, no displacement or peeling occurs after the bonding.

Example 8. In the above-described first embodiment, after the insulator 61 according to the present invention and the coil 8 of the transformer are laminated in the storage box of the transformer 7, the insulating oil is injected into the storage box to form the transformer 7. However, the present invention is not limited to this, and the same effect can be expected in the case where the transformer 7 is configured by injecting the insulating gas into the storage box.

[0035]

According to the first aspect of the present invention, a hole is provided in one of the flat plate and the spacer and a projection is provided in the other, and the flat plate and the spacer are assembled by fitting the hole and the projection, so that the assembly can be performed by a simple manufacturing facility. It is possible and there is no displacement or peeling. Moreover, the performance as an insulator is about the same as the conventional one.

According to the invention of claim 2, in addition to the invention of claim 1, the holes and the projections are circular in cross section, and at least two holes or projections are provided and positioned in one spacer. It is possible to assemble with a simple manufacturing facility in which deviation is unlikely to occur.

According to the invention of claim 3, in addition to the invention of claim 1, since the cross-sectional shape of the hole and the projection is made non-circular, the positional deviation can be eliminated by providing one hole or projection in one spacer. And can be assembled by simple manufacturing equipment.

According to the invention of claim 4, in addition to the invention of claim 1, since a groove communicating with the hole is provided, when insulating oil is injected into the transformer, the air between the hole and the protrusion forms a groove. Since it escapes through, the air does not stay in the insulating oil and insulation failure does not occur. Also, it can be assembled by simple manufacturing equipment.

According to a fifth aspect of the present invention, a spacer is constructed by fitting a plurality of insulating spacer bodies on one insulating sheet with holes provided on one side and projections provided on the other side to form a spacer. Since the insulating sheet is bonded to the flat plate, the spacer body is preassembled on a continuous insulating sheet, the insulating sheet can be cut to an appropriate length and bonded to the flat plate. The mating process is simpler and easier to handle than mating.

According to the sixth aspect of the present invention, one of the flat plate and the spacer is provided with a hole, and then the other is arranged so as to face the hole to form a protrusion at a position corresponding to the hole, and at the same time, fit the hole and the protrusion together. Therefore, the formation and fitting of the protrusions are completed in one step, and the manufacturing is simplified.

According to the invention of claim 7, in addition to the invention of claim 6, since the outer diameter of the caulking punch for forming the projection and fitting it in the hole is smaller than the outer diameter of the punch for forming the hole, the manufacturing is possible. It will be easy.

According to the invention of claim 8, in addition to the invention of claim 6, the adhesive is applied to the flat plate or the spacer after the holes are formed and before the projection is formed. Assembly is more secure.

[Brief description of drawings]

FIG. 1 is a diagram showing a method for forming a spacer of an insulating material according to an embodiment of the present invention.

FIG. 2 is a diagram showing a method of assembling a flat plate of an insulator and a spacer according to an embodiment of the present invention.

FIG. 3 is a structural diagram of a spacer according to another embodiment of the present invention.

FIG. 4 is a structural diagram of a spacer according to another embodiment of the present invention.

FIG. 5 is a diagram showing a method of molding a spacer of an insulating material according to another embodiment of the present invention.

FIG. 6 is a diagram showing a method of assembling a flat plate of an insulator and a spacer according to another embodiment of the present invention.

FIG. 7 is a diagram showing a structure in which the insulator of the transformer according to the present invention is laminated and assembled with the coil of the transformer.

FIG. 8 is a structural diagram of a spacer of another embodiment of the present invention.

FIG. 9 is a diagram showing a method for molding a flat plate of an insulator according to another embodiment of the present invention.

FIG. 10 is a diagram showing a method of assembling an insulating spacer and a flat plate according to another embodiment of the present invention.

FIG. 11 is a diagram showing a structure of an insulating spacer according to another embodiment of the present invention.

12 is a view showing a state where the spacer of FIG. 11 is assembled on a flat plate.

FIG. 13 is a diagram showing a general structure of an insulator of a transformer.

[Explanation of symbols]

11 flat plate 11a protrusion 1
1b hole 21 spacer 21a hole 2
1b Groove 21c Through hole 21d Through hole 2
1e Protrusion 22 Spacer body 4 Punch 5
Crimping punch 61 Insulator 8 Coil 9
Insulating sheet

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Hiroshi Takama 8-1-1 Tsukaguchihonmachi, Amagasaki City Mitsubishi Electric Corporation Production Technology Center (72) Inventor Anji Yoshizumi 651 Tenwa, Ako City Mitsubishi Electric Corporation Company Ako Factory

Claims (8)

[Claims] 1. In an insulator comprising a flat plate arranged between windings and a plurality of spacers arranged between the flat plate and windings, one of the flat plate and the spacer has a hole and the other has a protrusion. An insulator for a transformer, characterized in that a flat plate and a spacer are assembled by fitting holes and protrusions. 2. The insulator of a transformer according to claim 1, wherein the holes and the protrusions have a circular cross section, and at least two holes or protrusions are provided in one spacer. 3. The holes and protrusions have a non-circular cross section, and
The insulator of the transformer according to claim 1, wherein the holes or the protrusions are provided in the spacer. 4. The insulator of a transformer according to claim 1, wherein a groove communicating with the hole is provided. 5. An insulator comprising a flat plate arranged between windings and a plurality of spacers arranged between the flat plate and windings, wherein a hole is provided in one of the spacer body and the insulating sheet in the other. An insulator for a transformer in which a protrusion is provided, a hole and the protrusion are fitted to each other, and a plurality of spacer bodies are assembled on a single insulating sheet to form a spacer, and the insulating sheet is bonded to a flat plate. 6. A method of assembling an insulator comprising a flat plate arranged between windings and a plurality of spacers arranged between the flat plate and windings, wherein a hole is formed in one of the flat plate and the spacer. The method for assembling an insulator of a transformer, characterized in that the other is disposed so as to face the hole and the protrusion is formed at a position corresponding to the hole, and at the same time, the hole and the protrusion are fitted together. 7. With respect to the outer diameter of a punch forming a hole,
7. The method for assembling an insulator for a transformer according to claim 6, wherein the caulking punch for forming the projection and fitting the projection in the hole has a small outer diameter. 8. The method of assembling an insulator of a transformer according to claim 6, wherein an adhesive is applied to the flat plate or the spacer after the holes are formed and before the protrusions are formed.