JPH0725513U - Watertight insulated wire - Google Patents

Abstract

(57) [Summary] [Object] The present invention has an object to provide a watertight insulated wire for improving the watertightness of a power cable, particularly a submarine cable. [Structure] The present invention is such that an insulator 5,
It is a watertight insulated electric wire provided with a tape 7 having a thickness of 0.1 to 3.0 mm topping semi-conductive rubber on both sides of a woven cloth or a non-woven cloth, and a metal sheath 8. The insulator 5 of the tape 7 and the metal sheath 8 Good watertightness can be obtained by the adhesion function to.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a watertight insulated wire for improving the watertightness of a power cable, particularly a submarine cable.

[0002]

[Prior art]

 Conventionally, as a submarine cable, a water-impervious cable in which a metal sheath of lead or the like is applied to the outside of an insulator is known.

[0003]

[Problems to be solved by the device]

 However, in the case of such a submarine cable, if the metal sheath is destroyed due to an accident such as anchoring of a ship, water (seawater) penetrates in the longitudinal direction of the cable, and even after repairing the accident, Water may remain on the surface. If such water remains, the electrical characteristics of the cable will deteriorate, and further, there will be problems such as deterioration of the insulation due to flooding.

The present invention has been made in view of such conventional circumstances.

[0005]

[Means for Solving the Problems]

 According to the present invention, a water-tight conductor is sequentially coated with an insulator, a tape of 0.1 to 3.0 mm thick semiconductive rubber on both sides of a woven or non-woven fabric, and a metal sheath. It is a characteristic watertight insulated wire.

[0006]

[Action]

 This semi-conductive rubber topping tape adheres well to both the insulator and the metal sheath side, so even if the metal sheath breaks, seawater penetration in the longitudinal direction of the cable is effective. Be prevented.

[0007]

【Example】

 FIG. 1 shows an embodiment of a watertight insulated wire according to the present invention. In the figure, reference numeral 1 denotes a watertight conductor formed by twisting a large number of strands 2, and the conductor 1 is filled with a watertight mixture 3. The filling of the watertight mixture 3 is performed by press fitting or vertical attachment at the time of twisted wire. On this watertight conductor 1, an inner semiconductive layer 4, an insulator 5, an outer semiconductive layer 6, a thickness of 0. A woven cloth or a non-woven cloth is topped with a semi-conductive rubber of 1 to 3.0 mm on both sides, and a metal sheath 8 made of lead or the like is provided.

In the tape 7 on which the semiconductive rubber is topped, a woven cloth or a non-woven cloth is made to function as a tension member, and the semiconductive rubber topping layers provided on both surfaces of the woven cloth or the non-woven cloth are the inner insulators. 5. More precisely, it has a function of satisfactorily adhering (adhering) to the outer semiconductive layer 6 and the outer metal sheath 8. Therefore, the watertight insulated wire is laid as a submarine cable, and even if the metal sheath 8 portion of the cable is damaged due to an accident such as anchoring of a ship, the damaged portion is only peeled or removed. In the surrounding area, the outer semiconductive layer 6 and the metal sheath 8 are in close contact with each other due to the adhesive function of the tape 7. Can not penetrate in the longitudinal direction, and good watertightness can be obtained. The tape 7 may be applied either horizontally or vertically.

As the rubber material forming the topping layer, for example, butyl rubber, urethane rubber, chloroprene rubber, 1,4 polybutadiene rubber, isoprene rubber, etc. can be used. Carbon black, which is an imparting material, may be added.

The thickness of the tape 7 on which the semiconductive rubber is topped is set to 0.1 to 3.0 mm because when the thickness is less than 0.1 mm, expansion of the insulator caused by heat generation of the conductor when the cable is used, This is because shrinkage cannot be followed and watertightness cannot be maintained, and when it exceeds 3.0 mm, the outer diameter of the cable increases, which is not preferable.

In order to confirm the effect of the watertight insulated wire according to the present invention, the following sample wires were manufactured under various conditions, and a watertightness test was performed on each of these wires. However, the results shown in Table 1 were obtained. Here, the water tightness test is performed by removing a part of the metal sheath of the sample electric wire and immersing it in water having a water pressure of 10 Kg / cm ² for 24 hours, or by immersing it in the same water after bending it appropriately times. I went with.

(1) Example 1 A watertight conductor of 100 mm ² was coated with three layers of an outer semiconductive layer, a cross-linked polyethylene insulator and an inner semi-conductive layer by coextrusion, and after cross-linking treatment, the core was placed on this core. , A 1 mm-thick toping layer consisting of 100 parts by weight of butyl rubber and 100 parts by weight of carbon black is topped on both sides of a 0.2 mm-thick polyester base cloth, and the lead-coated metal is placed on the tape. Watertight insulated wire with sheath.

(2) Example 2 On the same core as in Example 1, a tape having a 0.1 mm-thick topping layer topped on both sides of a 0.07 mm-thick nylon base cloth was horizontally wound and Watertight insulated wire with a metallic sheath made of lead on the inside.

(3) Example 3 On the same core as in Example 1, a tape having a 3.0 mm-thick topping layer topped on both sides of a 0.2 mm-thick polyester base cloth was horizontally wound, Watertight insulated wire with a metallic sheath made of lead on the inside.

(4) Comparative Example 1 A watertight insulated electric wire in which a lead-coated metal sheath is applied on the same core as in Example 1.

(5) Comparative Example 2 On the same core as in Example 1, a tape with a 0.05 mm thick topping layer topping both sides of a 0.05 mm thick polyester base cloth was wound in a horizontal direction, Watertight insulated wire with a metallic sheath made of lead on the inside.

[0017]

[Table 1]

As is clear from Table 1 above, the watertight insulated electric wires (Examples 1 to 3) provided with the tape having a thickness of 0.1 to 3.0 mm and topped with semiconductive rubber had no water leakage. . On the other hand, water leakage was observed in the watertight insulated wires (Comparative Examples 1 and 2) that did not meet the conditions of the present invention.

The watertight insulated wire of FIG. 1 has a structure having inner and outer semiconductive layers, but the present invention is not limited to the watertight insulated wire having the structure of FIG. 1.

[0020]

[Effect of device]

 Thus, according to the present invention, in the case of a submarine cable or the like, even if the metal sheath is broken due to an accident such as anchoring of a ship, a semi-conductive rubber having a thickness of 0.1 to 3.0 mm is topped. Due to the adhesive function of the tape, the water-tight insulation effectively prevents water from entering in the longitudinal direction of the cable. Electric wire is obtained.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an embodiment of a watertight insulated wire according to the present invention.

[Explanation of Codes] 1 watertight conductor, 2 strands, 3 watertight mixture, 4 inner semiconductive layer, 5 insulator, 6 outer semiconductive layer, 7 tape with semiconductive rubber topped, 8 metal sheath,

Claims (1)

[Scope of utility model registration request] 1. A watertight conductor having an insulator and a thickness of 0.1 in sequence.
A watertight insulated electric wire, characterized in that a semi-conductive rubber of ˜3.0 mm is applied on both sides of a woven cloth or a non-woven cloth, and a metal sheath is applied.