JP2006120362A - Insulated wire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an insulated wire with excellent wind pressure reduction effect and capable of obtaining slow snow accretion effect. <P>SOLUTION: In the insulated wire 1 having a coating layer 3 made of an insulator on a conductor 2, a pair of projected parts 4, 5 formed by projecting parts of peripheries of the wire in crest shapes are arranged at places facing each other, and outer circumferential surfaces 1a, 1b of the wire are formed so that the pair of projected parts 4, 5 and parts 6, 7 except for the pair of projected parts continue without steps. It also has the slow snow accretion effect by spirally forming each of the pair of projected parts 4, 5 toward a wire longitudinal direction so that they are in the same direction. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an insulated wire having a coating layer made of an insulator on a conductor, and more particularly to an insulated wire capable of reducing wind pressure.

  When wind hits an insulated wire installed aerial outdoors or the like, Karman vortices are generated on the leeward side of the insulated wires, and the air pressure at the vortex generating portion is lowered, so that a large wind pressure is generated due to the pressure difference from the windward side. Therefore, when a strong wind is blown, the wind pressure generated by the Karman vortex may cause damage such as disconnection or collapse of a wire support such as a utility pole.

Conventionally, for example, Patent Document 1 discloses an electric wire having irregularities on its outer periphery as an electric wire for suppressing the generation of such a Karman vortex and reducing the wind pressure. According to the electric wire described in Patent Document 1, the unevenness provided on the outer periphery causes disturbance in the flow of wind flowing on the surface of the electric wire, thereby reducing Karman vortices.
JP 2001-118434 A

  However, according to the electric wire having irregularities on the outer periphery as described above, the generation of Karman vortex can be reduced as compared with the electric wire having a smooth outer peripheral surface, but the degree of reduction is not sufficient and satisfactory. There is a possibility that the wind pressure reduction effect cannot be obtained. In addition, raindrops and dust enter and accumulate in the recesses, and the recesses are filled, and the outer peripheral surface of the electric wire becomes smooth, and the initial effect may not be obtained.

  In addition, when an insulated wire is installed aerial outdoors, snow may adhere to the surface of the wire due to snowfall, and snow may grow on the surface of the wire, causing damage such as disconnection due to the weight of the snow. However, with the electric wire described in Patent Document 1, even if the wind pressure can be reduced, it is difficult to obtain a snowfall effect, and damage such as disconnection may occur due to the weight of snow.

  The objective of this invention is providing the insulated wire which can acquire the outstanding wind pressure reduction effect.

  Another object of the present invention is to provide an insulated wire that is excellent in wind pressure reduction effect and can also obtain a difficult snow accretion effect.

  In order to solve the above-mentioned problem, the insulated wire according to claim 1 is an insulated wire having a coating layer made of an insulator on a conductor, and a protruding portion formed by protruding a part of the outer periphery of the wire into a mountain shape. A pair of protrusions is provided at positions facing each other, and the outer peripheral surface of the electric wire is formed so that the pair of protrusions and the portions other than the pair of protrusions are continuous without a step.

  In the invention according to claim 1, a pair of angle-shaped protrusions are provided at opposite positions on the outer periphery of the electric wire, and the outer peripheral surface of the electric wire is continuous between the protrusion and a portion other than the protrusion without a step. Therefore, the flow of air flowing on the surface of the electric wire in a direction parallel to the direction in which the protrusions are arranged becomes smooth, and the generation of Karman vortices is suppressed and the wind resistance can be reduced.

  The insulated wire according to claim 2 is characterized in that each of the pair of protrusions according to claim 1 is formed in a spiral shape in the longitudinal direction of the wire so as to be in the same direction.

  In the invention according to the second aspect, since the pair of protrusions are formed spirally in the same direction in the longitudinal direction of the electric wire on the outer periphery of the electric wire, the snow once attached to the electric wire surface falls during the snowfall. It is easy to prevent snow accretion on the outer periphery of the electric wire.

  According to invention of Claim 1, the flow of the air which flows on the electric wire surface becomes smooth, can reduce wind resistance, and can obtain the insulated wire excellent in the wind pressure reduction effect. In addition, since it is not intended to reduce the wind pressure by providing irregularities on the surface of the electric wire as in the past, there is no possibility that the concave portion that has been a problem in the past is buried and the wind pressure reduction effect cannot be obtained. The wind pressure reduction effect can be maintained stably.

  According to the second aspect of the present invention, the pair of protrusions spirally formed in the longitudinal direction of the electric wire on the outer periphery of the electric wire can prevent snow from growing, and not only the wind pressure reducing effect but also the difficult snow receiving effect Can also be obtained.

Hereinafter, an example of the best mode for carrying out the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing an example of an embodiment of an insulated wire according to the present invention, where (A) is a cross-sectional view, (B) is a perspective view, and FIG. 2 is a state of air flow in the insulated wire shown in FIG. FIG.

  In the figure, an insulated wire 1 of this example is configured by forming a coating layer 3 by coating an insulator on a conductor 2 formed by twisting a plurality of strands such as an annealed copper wire.

  The covering layer 3 is provided with a pair of protruding portions 4 and 5 formed by protruding a part of the outer periphery of the electric wire into a symmetrical mountain shape (tapered shape). The pair of protrusions 4 and 5 are formed at positions facing each other on both sides across an arc portion which is a portion other than the pair of protrusions 4 and 5 on the outer periphery of the electric wire, and the pair of protrusions 4 and 5 The line connecting the apexes of the projecting portions 4 and 5 is formed so as to pass through the substantially central portion of the insulated wire 1. Thereby, the outer peripheral surface of the insulated electric wire 1 is comprised by the electric wire outer peripheral surface 1a of one side, and the electric wire outer peripheral surface 1b of the other side, and each electric wire outer peripheral surface 1a, 1b is the protrusion part 4, the circular arc parts 6, 7, And the protrusion part 5 and the circular arc parts 6 and 7 are formed smoothly so that it may continue without a level | step difference. In other words, the electric wire outer peripheral surfaces 1a and 1b are streamlined. And in this example, the protrusion parts 4 and 5 are formed so that it may extend linearly from the both ends of the circular arc parts 6 and 7 in the tangential direction. The covering layer 3 thus formed has a substantially eye shape in cross section.

  Further, the pair of protrusions 4 and 5 are formed in a spiral shape in the longitudinal direction of the electric wire. The projecting portions 4 and 5 are formed in a spiral shape in the same direction.

Next, the effect | action in the insulated wire 1 of this example comprised in this way is demonstrated.
In the insulated wire 1 of this example, a pair of mountain-shaped protrusions 4 and 5 are provided on the outer periphery of the wire so as to face each other, and the protrusions 4 and 5 and the arc portions 6 and 7 are continuous without a step. Since the outer peripheral surfaces 1a and 1b are formed, as shown in FIG. 2, the flow of air flowing on the wire surface in a direction parallel to the direction in which the protrusions 4 and 5 are arranged becomes smooth. Thereby, generation | occurrence | production of a Karman vortex is suppressed and wind resistance can be reduced.

  Moreover, in the insulated wire 1 of this example, since the protrusions 4 and 5 are formed spirally in the longitudinal direction of the electric wire on the outer periphery of the electric wire, the snow once attached to the electric wire surface is likely to fall, Snow accretion is prevented from growing.

  From the above, according to the insulated wire 1 of the present example, it is possible to obtain an excellent snow pressure reducing effect and a difficult snow landing effect. In addition, since it is not intended to reduce the wind pressure by providing irregularities on the surface of the electric wire as in the past, there is no possibility that the concave portion that has been a problem in the past is buried and the wind pressure reduction effect cannot be obtained. The wind pressure reduction effect can be maintained stably.

  Moreover, the shape which can obtain such a wind pressure reduction effect and a difficult snowfall effect at the same time can be formed when an insulator is extrusion coated on the conductor 2 when the coating layer 3 is formed. Therefore, it is possible to easily manufacture the insulated wire 1 of this example having both the wind pressure reducing effect and the difficult snowfall effect simultaneously.

  In the insulated wire 1 of the present example described above, the pair of protrusions 4 and 5 are formed so as to extend linearly from both ends of the arc portions 6 and 7, but not limited thereto, for example, a pair of protrusions 4 and 5 may be formed to be concave curved surfaces from both ends of the arc portions 6 and 7. Moreover, you may form the vertex of the protrusion parts 4 and 5 roundly.

  Furthermore, when it is only necessary to have a wind pressure reduction effect, the pair of protrusions 4 and 5 may not be formed in a spiral shape, and may be formed in a linear shape along the longitudinal direction of the electric wire. .

  Moreover, in the description of the above embodiment, the insulated wire 1 having only the covering layer 3 on the conductor 2 has been described as an example, but the insulated wire of the present invention is not limited to such a configuration. For example, a cable having an insulating layer as a covering layer on a conductor and further having a sheath as a covering layer on the insulating layer may be used.

It is a figure which shows an example of embodiment of the insulated wire which concerns on this invention, (A) is sectional drawing, (B) is a perspective view. It is a figure which shows the mode of the flow of the air in the insulated wire shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Insulated electric wire 1a, 1b Electric wire outer peripheral surface 2 Conductor 3 Coating layer 4,5 Protrusion part 6,7 Arc part

Claims (2)

In an insulated wire having a coating layer made of an insulator on a conductor,
A pair of protrusions formed by projecting a part of the outer periphery of the electric wire in a mountain shape are provided at positions facing each other, and the outer peripheral surface of the electric wire is formed so that the pair of protrusions and the portions other than the pair of protrusions are continuous without a step An insulated wire characterized by being formed.   2. The insulated wire according to claim 1, wherein each of the pair of projecting portions is formed in a spiral shape in the longitudinal direction of the wire so as to be in the same direction.

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