JPS6322128B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a low wind noise electric wire that suppresses wind noise.

When wind blows against overhead wires, a Karman vortex is generated behind the wires, which generates wind noise.

Conventionally, low wind noise electric wires that suppress this type of wind noise have been manufactured by installing multiple low wind noise devices on the outer periphery of the wire, which are made by integrally connecting a plurality of ring bodies attached to the wire with each other with a long and thin connecting body. It is known that the electric wires are installed at intervals, and the external shape of the electric wire when projected from a direction perpendicular to the longitudinal direction changes along the longitudinal direction, thereby disturbing the Karman vortices and thereby suppressing wind noise. ing.

However, since the above-mentioned conventional low wind noise device has only one elongated connecting body, if this is attached to the electric wire before the overhead line, it may be difficult to connect it after the overhead line due to the rotation of the electric line during the overhead line. The position of the elongated connecting body deviates from the planned position. In such cases, there is little change in the external shape along the longitudinal direction of the projected surface of the wire on which the wind blows, and in some cases no change in the external shape occurs, so the disturbance of the Karman vortex is reduced and the effect of suppressing wind noise is improved. There was a downside of decreasing.

On the other hand, it is conceivable to install the low wind noise device after the electric wire has been installed so that its elongated connecting body is placed in a predetermined position. When the wind blows from the same direction as described above, there is little change in the external shape, and in some cases it does not occur, so there is a drawback that the wind noise suppression effect is reduced.

The present invention improves these drawbacks.

This will be explained based on an embodiment shown in FIGS. 1 to 3.

In the figure, 1 indicates a plurality of low wind noise devices such as ACSR wires 2 attached to the wire 1 at intervals.

The low wind noise device 2 is constructed by integrally connecting a plurality of ring bodies 3 attached to the electric wire 1 with an elongated connecting body 4, as shown in FIG. 2A.

The ring body 3 is made of rubber, plastic, metal, etc., and a vertically divided slit 5 is provided in a part thereof as shown in FIG. At both ends of the slit 5, as shown in FIG. By engaging with the recess 7, the ring body 3 can be gripped and attached to the electric wire 1.

Furthermore, in FIG. 2B, 8 indicates a groove formed in the ring body 3, and this groove 8 increases the flexibility of the ring body 3.

Further, the elongated connecting bodies 4 are made of the same material as the ring body 3, and are provided in three pieces along the circumferential direction of the ring body 3, as shown in FIG.
Further, the mutual spacing is approximately the same.

Further, the width and height in the cross section of the elongated connecting body 4 are such that when it is attached to the electric wire 1, a part of the elongated connecting body 4 appears in a projected form from an arbitrary direction orthogonal to the longitudinal direction of the electric wire 1. It is formed like this.

That is, when three elongated connecting bodies 4 are provided at equal intervals along the circumferential direction of the ring body 3, the third
As shown in the figure, it is difficult to see a part of the elongated connecting body 4 of the low wind noise device attached to the electric wire 1 when projected from any direction when it is projected from the arrow direction A or B. That is, for example, when light hits the wire from the direction of the vertical line 9 passing through the center line (direction C or D in FIG. 3), the elongated connector 4 on the left side is projected, and the light also hits the wire from the direction of A and C. If it hits from between, the elongated connecting body 4 on the upper right will be projected. Therefore, it is in the direction of arrow A or B that a part of the elongated connecting body 4 is difficult to appear. At this time, the angle θ between the vertical line 9 passing through the center line and the elongated connecting body 4 adjacent thereto is 30 degrees.

Therefore, when the height H of the portion of the elongated connecting body 4 parallel to the vertical line 9 is defined as the radius R of the electric wire 1,
Make sure that H>R (1-cos30°), and then,
The width and height (thickness) of the elongated connecting body 4 are determined to include this H. When H is determined in this way, a part of the elongated connecting body 4 will necessarily be projected as shown in the projection shape shown in FIG. 3B.

In addition, the installation interval of the low wind noise device 2 to the electric wire 1 is as follows.
It is determined within a range of one to several times the length of the elongated connecting body 4.

Further, the cross-sectional shape of the elongated connecting body 4 is not limited to the angular shape, but may be any shape, and the number thereof may also be four or more.

According to the low wind noise electric wire of the present invention, the low wind noise device has three or more elongated connecting bodies interconnecting the ring bodies, and the structure can be arranged in any direction orthogonal to the longitudinal direction of the electric wire. Since a part of the elongated connecting body is visible in the projected form, a low wind noise device can be attached to the electric wire in front of the overhead line, so that even if the electric wire rotates during overhead wiring, the wind will always blow against it. Since a part of the elongated connecting body appears in the projected shape of the surface, the external shape can be reliably changed along the longitudinal direction of the electric wire, and the wind noise suppression effect can be significantly improved compared to conventional products.

In addition, as mentioned above, the low wind noise device appears in a projected form from any direction, so there is no need to pay attention to the placement position when installing the low wind noise device, and such work is much simpler. It has the effect of making it possible to

[Brief explanation of the drawing]

Fig. 1 is a front view showing an embodiment of the low wind noise electric wire of the present invention, Fig. 2 is a front view showing an example of a low wind noise device, and Fig. Figure 3 is a cross-sectional view taken along line 'A', Figure C is an enlarged view of the main part, Figure 3 A and B are explanatory diagrams for explaining the low wind noise device, A is a front view of the electric wire, and B is a diagram illuminated by light from the direction of arrow A. This is the projected form when 1...Electric wire, 2...Low wind noise device, 3...Ring body, 4...Elongated connecting body.

Claims (1)

[Claims] 1. A low wind noise electric wire in which a plurality of low wind noise devices, which are formed by integrally connecting a plurality of ring bodies attached to the electric wire with each other by an elongated connecting body, are attached at intervals around the outer circumference of the electric wire, The low wind noise device is provided with at least three or more elongated connecting bodies, and
A low wind noise electric wire, characterized in that the width and height of the elongated connecting body are formed so that a part of the elongated connecting body appears when projected from any direction perpendicular to the longitudinal direction of the electric wire.