JPS61167316A - Wind noise preventive device for aerial wire - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention is a device for preventing noise generated by overhead lines during strong winds, for example, a device for preventing noise generated by overhead power lines, overhead ground wires, and various other overhead lines during strong winds. This relates to a prevention device.

The overhead wire itself is deformed by making one or more of the constituent elements S protrude as irregularly shaped wires such as flat wires, or by removing one or more of the element wires and making them depressed. The cross-sectional shape is irregular, or the seventh and fifth
As shown in the figure, there were overhead wires with separate members such as spiral rods (or armor rods) attached. In general, when overhead wires receive wind from a certain direction, there is a so-called Karman on the leeward side of the overhead wire. Vortices are generated, and this Karman phenomenon is easy to change to a regular cycle because the cross-sectional shape of the overhead wire is uniformly circular along its length, and as a result, the overhead wire generates noise. Become.

The above-mentioned conventional wind noise prevention device was developed in view of the fact that the above-mentioned vibration of the overhead line is due to the regular periodicization of Karman vortex generation based on the fact that the cross-sectional shape of the overhead line is uniformly circular. , by changing the cross-sectional shape of the overhead wire,
This prevents the occurrence of Karman vortices from becoming regular.

[Problem that the invention seeks to solve]

Conventional overhead line wind noise prevention devices are constructed as described above, so it is extremely difficult to manufacture them when the overhead line itself has an irregular cross-sectional shape, and the drum winding process and overhead line method are difficult to manufacture. special consideration is required, such as
Furthermore, this method has the problem that it is completely impossible to apply it to existing overhead lines, and when a separate member such as a spiral rod is attached to the overhead line,
The wind noise prevention effect varies depending on the winding method of the spiral rod and the outer diameter of the strands, making it extremely difficult to select the optimum conditions for the span.

This invention was made to solve the above problems, and the purpose of this invention is not to prevent the generation of Karman vortices from occurring at regular intervals as in conventional devices, but to prevent the generation of Karman vortices themselves. [Means for solving the problem] The overhead wire wind noise prevention device according to the present invention is fitted onto the overhead wire and configured to be tiltable with respect to the overhead wire, and
The outer shape of the cross section perpendicular to the axis of the inner diameter part through which the overhead wire is inserted is a geometric shape such as a parabola or streamline on the downstream curved surface that is on one side of the diameter line passing through the axis. It is formed by a combination of wires, and the other side, the upstream curved surface, is formed in a shape that does not disturb the separation of the wind, such as an approximately semicircular shape, and the length is configured so that it can be tilted with respect to the overhead wire. ing.

[For production]

Since the overhead line wind noise prevention device of the present invention is constructed as described above, when it receives wind with a wind pressure greater than a strong wind that generates noise, the wind noise prevention device tilts and moves downwind in the wind direction. Since the downstream curved surface, which is the side formed by the geometric line, is oriented and the wind flows along this geometric linear surface, no Karman vortex is generated, and as a result, no noise is generated. do not have.

〔Example〕

Hereinafter, the present invention will be explained based on the drawings showing one embodiment thereof.

1 and 1, reference numeral 1 indicates a wind noise prevention device, and the wind noise prevention device 1 is formed with an inner diameter portion J through which an overhead wire a is inserted. line -
A gap is provided between the wind noise prevention device 1 and the wind noise prevention device 1, so that the wind noise prevention device 1 can be tilted with respect to the overhead power line.

In addition, the outer shape is a semicircular shape with ±flow side curved surface on one side of one diameter line A-A of the inner diameter part 3, as shown in FIG. Or, it is formed into a shape that does not disturb the separation of the wind, and the other side is a curved surface on the downstream side! is formed by a combination of geometric lines such as parabolas and streamlines. When the wind hits as shown by arrow B, the upstream curved surface reduces the wind resistance and does not disturb the separation. In addition, the downstream curved surface 5 formed by the combination of competitive lines 1 smoothes the flow of the wind and prevents the generation of Karman vortices. Furthermore, the length of this wind noise prevention device l is such that it can be tilted freely relative to the overhead wire.

In addition, in the above embodiment, an example was shown in which the overhead wire is inserted directly into the inner diameter part J, but in this case, a lubricant such as grease may be interposed between the inner diameter part J and the overhead wire. Alternatively, as shown in Fig. 3, a liner 6 fixed to the overhead wire may be provided, and the wind noise prevention device l may be fitted to this liner 6 in a tiltable manner. The downstream curved surface 3 may be a combination of curved surfaces that are less susceptible to wind resistance, or the downstream curved surface 3 may be recessed toward the inside as shown in FIG.

Furthermore, the material of this wind noise prevention device l may be any material such as synthetic resin or metal, but it is preferable that it is lightweight and has a low weight burden, and if it is made of a material that does not easily accumulate snow on its surface, it can be used as an anti-snow accretion device. It can also be used for both.

The wind noise prevention device of the present invention configured as described above is installed by inserting the overhead wires between the spans as shown in Fig. 6, but depending on the topography, weather conditions, and the state of human residences, some installation may be difficult. However, if it is effective, it may be possible to install it partially instead of installing it over the entire span as shown in the figure. In this case, to prevent the wind noise prevention device from shifting sideways, attach a ring to prevent side slippage to the overhead wire. Or, wrap the binding wire around the wind noise prevention device to prevent it from shifting laterally.

Since the wind noise prevention device of the present invention is configured as described above, in the case of no wind or light wind, the downstream curved surface j hangs downward, but is not subjected to wind pressure greater than the strong wind that generates noise. In this case, the downstream curved surface 5 is tilted by the wind, and the downstream curved surface S is directed to the leeward side. Therefore, the wind that hits the overhead wire with a wind pressure greater than the strong wind that generates noise is smoothly divided by the upstream curved surface, and then the downstream curved surface! , flows downstream along the wind noise prevention device 1, merges easily at the end of the wind noise prevention device 1, and flows away.

〔Effect of the invention〕

According to the wind noise prevention device of the present invention, even if the wind has a wind pressure higher than that of a strong wind that generates noise and would normally blow behind the overhead line and generate a Karman vortex, it can be installed on the overhead line. After being separated by the wind noise prevention device and flowing smoothly, they merge smoothly at the rear end of the wind noise prevention device, so no Karman vortex itself is generated, and therefore, naturally This has the effect of providing an overhead line wind noise prevention device that does not cause periodicization and, as a result, does not generate wind noise.

[Brief explanation of the drawing]

FIG. 7 is a perspective view of a wind noise prevention device according to an embodiment of the present invention;
1 is a side view of FIG. 1, FIG. 3 is a perspective view of another embodiment of the inner diameter portion of FIG. 1, and FIG. 1 is a side view of another embodiment of the upstream curved surface of FIG. 8g! The figure is a side view of another embodiment of the downstream curved surface of Fig. 1. Fig. 6 is an explanatory diagram of the state in which the wind noise prevention device of the present invention is attached to an overhead line, and Figs. FIG. 3 is an outline drawing of an overhead wire with a separate member attached as a wind noise prevention device. !・・Wind noise prevention device, K・・Overhead wire, J・・Inner diameter part,
Da...upstream curved surface! ...Downstream curved surface, 6...Liner.

Claims (1)

[Claims] An overhead wire is inserted through the inner diameter portion, and at least the outer portion is configured to be rotatable with respect to the overhead wire, and the outer shape of a cross section perpendicular to the inner diameter portion axis substantially passes through the inner diameter portion axis. The upstream curved surface on one side of the diameter line is formed in a shape that does not disturb the air separation, and the other curved surface on the downstream side is formed by a combination of geometric lines such as parabolas and streamlines. A wind noise prevention device for an overhead line, characterized in that the length is configured to be rotatable with respect to the overhead line.