JPS6035928Y2 - Low wind noise overhead power line - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to overhead power lines such as overhead ground wires and overhead power transmission lines that have reduced wind noise.

When wind blows against overhead power lines, a Karman vortex is generated behind the wires, producing wind noise.

Conventionally, as an overhead electric wire with reduced wind noise of this type, one in which a metal wire such as an armor rod is wound around the outer circumference of the overhead electric wire in a spiral shape at a predetermined pitch is known.

However, in this low wind noise overhead electric wire, since the metal wire is of a solid type, the weight per unit length of the power wire increases, and the wire has a drawback that the slackness of the wire increases.

The present invention improves these drawbacks.

This will be explained based on an embodiment shown in FIGS. 1 and 2.

In the figure, 1 is a known overhead electric wire such as steel-core aluminum stranded wire, 2
shows a metal pipe wrapped around the outer periphery of an overhead electric wire 1.

The metal pipe 2 is formed into a hollow shape with a circular cross section by extrusion molding of a material such as aluminum that is normally used for armor rods, and a plurality of these are formed into a spiral shape with a predetermined pitch around the outer periphery of the overhead electric wire 1, as shown in FIG. It is wrapped in a shape.

The winding of each metal pipe 2 is performed by forming a predetermined number of metal pipes 2 into a spiral shape in advance so that the winding direction is different, and as shown in FIG. The winding is performed so that the S twist direction and the Z twist direction are repeated at a constant rate.

In addition, seals 3 made of rubber, plastics, paint, etc. are attached to the openings at both ends of each metal pipe 2, as shown in FIG.
is provided to prevent rainwater etc. from entering the inside of the metal pipe 2.

Furthermore, the seal 3 is colored in different colors so that the metal pipe wound in the S-twist direction and the metal pipe wound in the 2-twist direction can be easily distinguished.

In this embodiment, the metal pipe 2 is wound so that the S twist direction and the Z twist direction are repeated in a constant manner. Either one of the windings may be wound in the direction, or the windings in the S-twist direction and the windings in the Z-twist direction may be overlapped and installed so as to cross each other.

If the metal pipes cross each other, the intersections of the metal pipes can also be crushed.

Furthermore, the seal 3 can be omitted depending on the situation.

However, the low-wind-noise overhead wire of the present invention consists of a metal pipe wound spirally around the outer circumference of the overhead wire, so when wind blows against it, the Karman vortex behind the wire mixes with it, reducing the generation of wind noise. Moreover, since the wire wrapped around the overhead wire is a metal pipe, the weight is significantly reduced compared to the conventional wire wrapped with metal wire, and the weight per unit length of the overhead wire is reduced. The sag can be significantly reduced.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of the low wind noise overhead electric wire of the present invention, and FIG. 2 is an enlarged sectional view of the main part thereof. 1...Overhead electric wire, 2...Metal pipe.

Claims (2)

[Scope of utility model registration request] (1) A low wind noise overhead electric wire characterized by a metal pipe wound spirally around the outer circumference of the overhead electric wire. (2) The low wind noise overhead electric wire according to claim 1, wherein the metal pipe has openings at both ends sealed.