JPH0733552Y2 - Spiral rod - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an improvement of a spiral rod wound around the outer periphery of an electric wire in order to prevent wind noise of the electric wire.

[Prior art and problems] For the purpose of preventing wind noise and icing and snow, etc., a technique of winding a spiral rod formed in a spiral shape at a predetermined pitch in advance on the outer circumference of an overhead transmission line has been proposed from early on, and many have already been proposed. There is a demonstration of. Since then, it has been widely applied not only to main lines of overhead power lines but also to overhead ground lines and jumper lines, and the winding conditions are not always uniform.

In other words, when it is wound around an electric wire that is in a relatively straight line such as an overhead power transmission line or an overhead ground line, there is no problem, and its installability and winding condition of the terminal are good and stable. The state is maintained.

However, a large bend R such as a jumper wire
When the conventional spiral rod is wound around the portion having the mark, when the end 2a of the spiral rod 2 wound around the outer periphery of the electric wire 1 is located outside the bend R as shown in FIG. The terminal 2a does not fit in the bending R of the electric wire 1 and is wound in a state where the terminal 2a floats above the outer peripheral surface of the electric wire 1 as shown in FIG. 3A.

If the terminal 2a is left in such a state that the terminal 2a is rolled up and projected from the electric wire 1, it becomes an electrically defective portion in the ultra high voltage power transmission line, which causes an unfavorable obstacle such as corona generation. Furthermore, if it is a jumper wire, sideways vibration will occur due to wind pressure, and due to this side contact, the spiral rod 2 will start to deviate from the raised terminal 2a portion, and in the worst case, the spiral rod 2 will separate from the electric wire 1. There is a fear of falling out.

[Purpose of the Invention] The present invention has been made in view of the above-described circumstances, and even when the winding target has a bend R,
An object of the present invention is to provide a novel spiral rod which can be wound while being properly conformed to the bend R, thereby preventing the terminal from floating.

[Summary of the Invention] In the present invention, a spiral rod spirally formed at a constant pitch set by the wire diameter of the wire itself or the wire diameter of the wire to be wound is spirally formed in the same direction at a pitch larger than the pitch. It has been formed by heavy molding, and by having a larger second spiral pitch,
Even when wound around the bent R portion, a wrapping force that causes the terminal to closely contact in the wire direction is generated, and the terminal can be prevented from rising.

[Embodiment] The present invention will be described below with reference to the drawings.

FIG. 1 is a sketch showing a spiral rod 2 formed in a spiral shape with a spiral pitch P ₁ .

The pitch P ₁ of the spiral rod 2 has an optimum range depending on the wire diameter of the spiral rod 2 itself or the wire diameter of the electric wire 1 to be wound, and the pitch P ₁ is determined in consideration of them.

FIG. 2 shows the first pitch P ₁ determined as described above.
FIG. 6 is an explanatory sketch showing a spiral rod 2 according to the present invention, which is formed by re-spiral forming the whole in the same direction as the first pitch P ₁ with a pitch P ₂ which is a larger pitch.

As described above, when the spiral rod 2 has the pitch P ₁ originally required when the spiral rod 2 is wound around the electric wire 1 and the re-forming pitch P ₂ larger than that, the spiral rod 2
When is wound around the electric wire 1 with a bend R, an unbalanced part occurs in the winding gripping force near the center of the spiral rod 2, but the reaction force due to winding is concentrated on both terminals 2a, 2a, The terminal 2a is acted upon by a force in the direction in which the terminal 2a is in close contact with the electric wire 1 side, and the possibility that the terminal 2a floats above the electric wire 1 and is separated from the electric wire 1 as in the conventional example is eliminated.

[Advantage of Invention] As described above, according to the spiral rod of the present invention,
Even if it is wound around the outer circumference of an electric wire having a tight bend R such as a jumper wire, there is no risk of the terminal floating and protruding from the electric wire, which can prevent undesired obstacles such as corona from occurring and also cause the wire to shake laterally. Even if it occurs, it is possible to completely eliminate the concern that the spiral rod will loosen and fall off from the electric wire, and the need to apply spiral rod winding treatment to jumper wires etc. will increase due to the environmental conditions of the transmission line. There is a great effect on the field of the present invention that is being made.

[Brief description of drawings]

FIG. 1 is a sketch showing a state in which spiral forming is performed at a first pitch necessary for the winding purpose, and FIG. 2 is a book in which a spiral rod having a first pitch is further re-formed at a second pitch. FIG. 3 is an explanatory sketch of a spiral rod according to the invention, and FIG. 3 is an explanatory view showing a situation in which a conventional spiral rod is wound around an electric wire having a bend R. 1: Electric wire, 2: Spiral rod, 2a: Terminal.

Claims (1)

[Scope of utility model registration request] 1. A filament is formed into a spiral shape at a constant first pitch set by the diameter of the filament itself or the diameter of an electric wire around which the filament is wound. A spiral rod formed by reshaping in a spiral shape in the same direction as the first pitch at a second pitch larger than the first pitch.