JP2697903B2 - Pipe conductor vibration isolator - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration isolator for a pipe conductor used in a pipe bus, a pipe jumper device, or the like.

(Prior art)

Conventionally, as a device for preventing vibration of a pipe conductor, a rigid rod is disposed in the same direction as the pipe conductor, and both ends of the rigid rod are attached to a support fixed to the pipe conductor via a friction member. In addition, there is known a structure in which the natural frequency of the rigid rod is substantially equal to the natural frequency of the pipe conductor (Japanese Utility Model Publication No. 58-7780).

In this vibration isolator, when a pipe conductor vibrates, a rigid rod having substantially the same natural frequency as the pipe conductor resonates. Consumes
It suppresses vibration of the pipe conductor.

〔Task〕

For pipe conductors used at high voltage, it is required to accommodate the vibration isolator inside the pipe conductor to prevent corona discharge. Since the natural frequency of the conductor is almost matched, the length of the rigid rod must be increased. However, there is a problem that the contact with the inner surface of the pipe conductor makes it impossible to exhibit the function as a vibration isolator.

Therefore, when the length of the rigid rod is shortened, its natural frequency becomes higher than the natural frequency of the pipe conductor, so that the rigid rod hardly resonates with the pipe conductor, the consumption of vibration energy is reduced, and the vibration is reduced. There is a disadvantage that the effect is reduced.

[Solutions to solve the problem]

The present invention provides a vibration isolator for a pipe conductor that solves the above-described problems, and has a structure in which a rigid rod is disposed in the same direction as the pipe conductor, and both ends of the rigid rod are disposed as described above. The support fixed to the pipe conductor is attached by applying pressure by an elastic body, and the natural frequency of the rigid rod is 1.2 to 1.5 times the natural frequency of the pipe conductor. .

[Action]

According to the above configuration, when the pipe conductor vibrates, the action of the elastic body makes it easier for the vibration of the vibration isolator combining the rigid rod and the elastic body to coincide with the vibration of the pipe conductor. Therefore, even if the length of the rigid rod is shortened, it is possible to make the natural frequency of the vibration isolator substantially coincide with the natural frequency of the pipe conductor, and the short vibration isolator can efficiently reduce the length of the pipe conductor. Vibration can be prevented.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

1 and 2 show a vibration isolator for a pipe conductor according to one embodiment of the present invention. In the figure, 1 is a pipe conductor,
Reference numeral 2 denotes a rigid rod-shaped body arranged in the same direction in the pipe conductor 1, 3 denotes a terminal plate fixed to both ends of the rigid rod-shaped body 2 by welding or the like, and 4 denotes a length of the rigid rod-shaped body 2 in the pipe conductor 1. A pair of support members fixed at intervals corresponding to the following, 5 is a bolt penetrating through the holes formed in the support member 4 and the terminal plate 3, 6 is an elastic body such as a coil spring,
Reference numeral 7 denotes a nut for tightening the elastic body 6 so as to compress it.

With the above configuration, the pipe conductor 1 has an outer diameter of 210 mm and a thickness of 1
0 mm, using an aluminum alloy pipe length 10 to 20 m, a steel rod having an outer diameter of 28mm as a rigid rod-like body 2, the natural frequency f _D is 1.0 to 2.0 times the natural frequency f _P of the pipe conductor 1 The vibration damping rate of the pipe conductor 1 in the case where various lengths cut in the above manner were prepared and both ends of each rigid rod 2 were attached to the support 4 via the elastic body 6 was measured. The result is shown in Fig.-3
(A). From this result, the rigid rod 2
The natural frequency f _D of 1.2 to the natural frequency f _P of the pipe conductor 1
It can be seen that the vibration damping rate of the pipe conductor 2 becomes extremely high in the range of 1.5 times.

For comparison, the vibration attenuation rate of the pipe conductor was measured when the same pipe conductor and the rigid rod were used and the rigid rod was attached without using an elastic body (conventional structure).
The result is as Figure 3 in (b), in this structure, most vibration damping factor is increased when f _D = f _P.

〔The invention's effect〕

As described above, according to the present invention, the natural frequency of the rigid rod is made to be 1.2 to 1.5 times the natural frequency of the pipe conductor, that is, the rigid rod is made shorter than before so that the pipe conductor can be prevented more efficiently. Shaking can be performed. Therefore, there is an advantage that the deflection of the rigid rod-shaped body can be reduced, the storage in the pipe conductor is facilitated, and the vibration isolator can be reduced in weight.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of a pipe conductor vibration isolator according to the present invention, FIG. 2 is a transverse sectional view taken along line II-II of FIG. 1, and FIG. It is a graph which shows the difference of the vibration damping rate by the presence or absence of an elastic body. 1: pipe conductor, 2: rigid rod, 3: terminal plate, 4: support, 5:
Bolt, 6: coil spring (elastic body), 7: nut.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yukio Yamaguchi 1-3-1 Uchisaiwaicho, Chiyoda-ku, Tokyo Tokyo Electric Power Company, Inc. (72) Inventor Masanori Isozaki 1-3-1 Uchisaiwaicho, Chiyoda-ku, Tokyo TEPCO Inside the corporation

Claims (2)

(57) [Claims] A rigid rod is disposed in the same direction as a pipe conductor, and both ends of the rigid rod are attached to a support fixed to the pipe conductor by applying pressure by an elastic body, and the rigid rod is attached to the support. A vibration isolator for a pipe conductor, wherein the natural frequency of the body is 1.2 to 1.5 times the natural frequency of the pipe conductor. 2. The vibration isolator according to claim 1, wherein the elastic body is a coil spring.