JP2673201B2 - Anti-snow and wind noise prevention rod - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a rod for preventing snow accretion and wind noise. (Problems to be Solved by Conventional Techniques and Inventions) Relatively frequent problems in power transmission lines are snow accretion on the surface and noise caused by wind. In order to prevent the snow accretion, a snow accretion preventing ring as shown by reference numeral 101 in FIG. 3 has been widely used. This snow-prevention ring 101 is based on a preventive mechanism that collects snow on the wire sliding along the twisted groove 1A of the overhead bare wire 1 and promotes its fall, but this ring is generally made of plastic. Therefore, the thermal conductivity is poor, and the temperature of the ring itself becomes low, so that snow accretion freezes in the vicinity of this ring, and the original function of preventing snow from falling is often lost. Further, in order to prevent wind noise, the spiral wind noise prevention rod 102 that inhibits the regular generation of Karman vortices, which is the cause,
Is known, and as shown in the drawing, the snow-prevention ring 101 described above.
Often used together with. The wind noise prevention rod 102 itself has no particular drawbacks, but it is extremely complicated that it is necessary to take separate countermeasures for the power transmission line in order to prevent the two major problems of wind noise and snow. It also has the drawback of poor workability. (Means for Solving Problems) The present invention has been made to solve the above problems, and is a rod having both a snow accretion prevention portion and a wind noise prevention portion, specifically, a spiral shape. A metal wire rod having a snow-prevention portion formed in a spiral shape substantially orthogonal to the twist groove of the overhead bare wire to be mounted, and a spiral shape having a spiral pitch larger than the spiral pitch of the snow-prevention portion. A rod for preventing snow accretion and wind noise, which is formed by alternately and continuously providing wind noise prevention portions formed in the above. (Embodiment) A first embodiment of the present invention will be described with reference to FIG. For example, a rod 2 for preventing snow and wind noise, which is continuously and integrally formed into a spiral shape by using an appropriate metal wire material such as a steel wire, has a spiral inner diameter slightly smaller than the outer diameter of the overhead bare wire 1 to be mounted. However, the twist groove 1A of this overhead bare wire 1 is provided at both ends of the wind noise prevention part 22 having a relatively long spiral pitch p _L.
In the case of this example, the wind noise preventive portion 22 is equivalent to one coil, and the snow accretion preventive portion 21 having a relatively short spiral pitch p _S substantially orthogonal to In addition, the snow accretion prevention unit 21 is provided for each coil. The value of the spiral pitch p _L of the wind noise prevention unit 22 is usually in the range of 50 to 500 mm, and as the spiral pitch p _S of the snow accretion prevention unit 21, its coil portion is almost the same as the twist groove 1A of the overhead bare wire 1. From the orthogonal conditions, ΔABE and ΔBCD are similar in FIG. 4, and a value around p _S = 4d ² / p is appropriate, where the outer diameter of the overhead bare wire 1 is d. FIG. 2 shows a second embodiment of the present invention.
In this structure, a snow accretion preventive portion 21 is provided in the center of the rod 2 for one coil, a wind noise preventive portion 22 is provided for each coil on both sides thereof, and two snow accretion preventive portions 21 are provided at both ends. It is provided for minutes. In any of the examples, the twisted groove 1A of the overhead bare wire 1
The snow accretion prevention part 21 in a spiral shape substantially orthogonal to the above acts to collide with the snow accretion sliding along the twisted groove 1A and drop it off, and the wind noise prevention part 22 causes the wake of the overhead bare wire 1 to flow. The wind noise is prevented by suppressing the generation of Karman vortices. Since this rod 2 for preventing snow accretion and wind noise is made of a metal wire rod, it is not heated and cooled by the conductive heat from the overhead bare electric wire 1, and in that respect, it is found in the conventional snow accretion prevention ring. There is no such drawback. Further, it can be seen that if the rod 2 for preventing snow accretion and wind noise of the present invention is made of a low Curie material having a Curie point of around 0 ° C., it is more effective in preventing snow accretion. (Effect of the Invention) The snow and wind noise preventing rod of the present invention is a spiral metal wire in which a snow accumulation preventing portion and a wind noise preventing portion are connected in series. By carrying out a simple work of winding, it is possible to satisfy both the effects of preventing snow accretion and preventing wind noise.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view showing a first embodiment of the present invention, FIG. 2 is a side view showing a second embodiment, and FIG. 3 is a side view showing a conventional technique. The figure is an explanatory diagram for calculating the spiral pitch of the snow accretion prevention unit. 2 …… Snow and wind noise prevention rod, 21 …… Snow accumulation prevention part, 22 …… Wind noise prevention part, p _S , p _L …… Spiral pitch.

Claims (1)

(57) [Claims] A spiral metal wire rod, which is formed in a spiral shape and is substantially orthogonal to the twist groove (1A) of the overhead bare wire (1) to be mounted, and the snow snow prevention part (21). ) And a wind noise prevention part (22) formed in a spiral shape having a spiral pitch (p _L ) larger than the spiral pitch (p _S ) of FIG. A rod that also prevents snow and wind noise. 2. The rod for combined use for preventing snow accretion and wind noise according to claim 1, characterized in that the metal wire is a low quality material.