JPH0536714U - Running water prevention conductor - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a running prevention conductor capable of preventing running water through a gap between strands constituting a segment. [Structure] The layer insulation 13 and the segment insulation 12 are composed of vertically adsorbed water-absorbing insulating paper tape, and each segment 11
The water-absorbing powder 13b is interposed between the strands 11a constituting the.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a split conductor in a split conductor cable, and particularly to a running protection conductor.

[0002]

[Prior Art]

 The rubber and plastic cable split conductors are composed by combining a plurality of fan-shaped cross-section segments that are circular in a radial direction, and each segment is segment-insulated. Since the above-mentioned segment is formed by molding a stranded conductor, if there is water from the cable sheath, running water will be generated in the segment in the direction of the conductor.

As a means for preventing water running as described above, a water running preventing conductor having a structure shown in FIG. 3 has been developed (Actual Development No. 59-59412). In this running prevention conductor, the segment conductor element wire 11a is used as a stranded wire and is molded to form a segment 11. The segment 11 is provided with a segment insulation 12 using a water-absorptive insulating paper tape, and the segment wire 11a is provided between layers. Similarly, the layer insulation 13 is formed by a water absorbent insulating paper tape. In the figure, 14 is an inner semiconductive layer of the cable, 15 is an insulator, and 16 is an outer semiconductive layer.

In the conventional water-flow-preventing conductor having the above structure, the water-absorbent insulating paper tape forming the segment insulation 12 and the layer insulation 13 has a water-running prevention effect. That is, the water-absorbent insulating paper swells when it comes into contact with water. As a result, the insulations 12 and 13 enter between the wires 11a and prevent water running in the longitudinal direction of the conductor. Similarly, running water between the segments 11 is prevented.

[0005]

[Problems to be solved by the device]

 In the conventional water-spreading prevention conductor having the above-mentioned structure, since the water-splash prevention in the segment 11 depends on the water-absorptive insulating paper tape forming the layer insulation 13, swelling of the water-absorptive insulating paper due to contact with water. Even if occurs, the water-absorbent insulating paper does not sufficiently enter the space between the wires 11a, and there is a gap between the wires 11a, and running water can be seen through this gap, resulting in a completely watertight structure. Is hard to say. Moreover, if the thickness of the water-absorbent insulating paper is increased to improve the water absorption, it becomes difficult to mold the segment 11.

The present invention has been made in view of the above circumstances, and provides a running prevention conductor capable of sufficiently preventing not only running water between segments of a split conductor cable but also running water between strands in a segment. provide.

[0007]

[Means for Solving the Problems]

 The water-running prevention conductor of the present invention is characterized in that the layer insulation is constituted by a vertically-adsorbing water-absorbing insulating paper tape, and water-absorbing powder is interposed between the wires constituting each segment.

[0008]

[Action]

 In the running prevention conductor of the present invention having the above structure, the water-absorbing powder between the strands swells upon flooding to fill the gaps between the strands and prevent running water through the gaps.

[0009]

【Example】

 1 is a sectional view of an embodiment of the present invention in which the same parts as those in FIG. 3 are denoted by the same reference numerals. In this figure, the layer insulation 13 of the water flow prevention conductor of the present invention is constructed as follows. That is, the water-absorbent insulating paper tape 13a vertically interposed between the layers of the segment 11 and the water-absorbent insulating paper tape 13a which is sprinkled between the wire strands 11a in each layer of the conductor wire 11a and is vertically attached. It is composed of a water-absorbing powder 13b wrapped with a layer of the wire 11a.

In the water running prevention conductor of the present invention having the above structure, when water is immersed in the cable, the water absorbing insulating paper tape 13a of the layer insulation 13 and the segment insulation 12 both swell to prevent water running between the segments. The action is obtained. At the same time, the water-absorbing powder 13b sprinkled between the strands is also swollen, so that the swollen powder also eliminates the gaps between the strands 11a, thereby providing a water running preventing effect in the segment 11. It will be.

FIG. 2 is a perspective view showing a state in which the running protection conductor of the present invention having the above structure is manufactured. In FIG. 2, the segment 11 coming into the process of this figure is provided with layer insulation interposed between the layers in the process up to the previous stage, and the water absorbent powder 13b is sprayed on the outer peripheral surface of the segment 11. ing. In the illustrated step, the wires 11a forming the next layer of the segment 11 are twisted together, and the water absorbing insulating paper tape 13a is vertically attached and the wires 11a are compression-molded by the molding roll 17.

The compression-molded segment 11 is coated with oil via an oil coating die 18. Next, the segment 11 is passed through the coating tank 19 containing the water-absorbing powder 13b, and the water-absorbing powder 13b is attached and applied to the outer peripheral surface.

The segment 11 coated with the water-absorbing powder as described above is sent to the next step, and the next layer is formed in the same manner as described above.

[0014]

[Effect of the device]

 As is clear from the above, in the water-running prevention conductor of the present invention, not only can water running be prevented between the segments, but water running inside the segments through the voids between the strands forming the segments can also be prevented. Therefore, it is possible to construct a highly reliable water running prevention cable.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a running prevention conductor of the present invention.

FIG. 2 is a perspective view showing a state in which the water flow prevention conductor of the present invention is manufactured.

FIG. 3 is a cross-sectional view showing an example of a conventional water running prevention conductor.

[Explanation of symbols]

 11 ... Segment 12 ... Segment insulation 13 ... Layer insulation 13a ... Water absorbing insulating paper tape 13b ... Water absorbing powder

Claims (1)

[Scope of utility model registration request] 1. A water-running prevention conductor, characterized in that the layer insulation is constituted by a vertically adsorbed water-absorbing insulating paper tape, and water-absorbing powder is interposed between the wires constituting each segment.