JPH043466Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a tightening device for iron cores in transformers, reactors, etc.

[Conventional technology]

Fig. 3 shows a conventional iron core tightening device for electrical equipment. It is tightened with tightening bolt 3. Note that FIG. 4 is an action diagram when the core tightening bolt 3 vibrates, and 5 is a point where the core tightening bolt 3 and the iron core 2 come into contact at this time.

Next, the operation will be explained. The vibration of the core 2 generated by the electromagnetic force is transmitted to the end frame 4 and further vibrates the core tightening bolt 3, but at this time, the core tightening bolt 3 swings as shown by the chain line in Fig. 4 due to forced vibration. It comes into contact with iron core 2 and begins to generate noise.
Therefore, in order to prevent this, conventionally the through hole 2 of the iron core 2 was
The iron core tightening bolt 3 and the iron core 2 were prevented from coming into contact by increasing the value a and by paying attention to the centering of the core tightening bolt 3 when installing it.

[Problem that the invention attempts to solve]

As described above, with conventional iron core tightening devices, care must be taken to bring the core tightening bolts to the center, which increases work time and also causes noise from contact during noise and vibration tests after assembly is completed. If it was found that the contents were damaged, the contents had to be removed and reworked.

This invention was made in order to eliminate the above-mentioned drawbacks of the conventional device, and the purpose is to provide an iron core tightening device that can eliminate noise sources.

[Means for solving problems]

The iron core tightening device according to this invention fills a filling made of adhesive between the iron core and the iron core tightening bolt,
This eliminates the gap.

[Effect]

In this invention, the core tightening bolt is fixed by the filling, and the vibration of the core tightening bolt itself is completely suppressed.

〔Example〕

1 and 2 show an embodiment of this invention. In the figures, 6 is a through hole provided in the core tightening bolt 3, and 7 is a through hole 2a provided through the through hole 6.
This is a filler such as epoxy adhesive poured between the bolt and the tightening bolt 3. Note that the other configurations are the same as those of the above-mentioned conventional device, so explanations will be omitted.

Next, its effect will be explained. Vibrations are generated in the core 2 due to electromagnetic force, and this vibration is transmitted to the core tightening bolts 3 via the end frame 4, as in the conventional system, but in the present invention, the core tightening bolts 3 and the core 2
Since the adhesive filler 7 is inserted between the iron core and the core tightening bolt to eliminate the gap and the iron core and the core tightening bolt are integrated, the vibration of the core tightening bolt itself can be completely suppressed.

[Effects of the invention] As described above, according to this invention, the adhesive filling is filled between the core and the core tightening bolt through the through hole of the bolt, so that the centering of the core tightening bolt is prevented. It can be easily manufactured without paying attention to the noise, and the generation of noise can be completely prevented.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing an embodiment of this invention, Fig. 2 is a sectional view taken along the - line in Fig. 1, Fig. 3 is a sectional view showing a conventional iron core tightening device for electrical equipment, and Fig. 4. is an explanatory diagram of its action. In the figure, 2 is an iron core, 3 is an iron core tightening bolt, 4 is an end frame, 6 is a through hole, and 7 is a filling. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] In a core tightening bolt that is inserted into a through hole provided in a laminated core and tightened, the bolt passes through the center from the end toward the middle,
A through hole communicating with the outer periphery is provided in the intermediate portion, and a filler made of adhesive filled through the through hole of the bolt is provided in the gap between the through hole of the iron core and the bolt. Iron core tightening device.