CN103268785A - Anti-bending floating single-shield coaxial cable - Google Patents

Abstract

In order to solve the problem of low anti-bending fatigue limit of an offshore floating coaxial cable, the invention discloses an anti-bending floating single-shield coaxial cable. The center of the cable is an inner conductor, an insulating layer is arranged outside the inner conductor, an outer conductor is arranged outside the insulating layer, an outer sheath is arranged outside the outer conductor, a strength component is arranged outside the outer sheath, an outer bonding sheath is arranged outside the strength component, a foaming sheath is arranged outside the outer bonding sheath, and the strength component is made from aramid. The anti-bending floating single-shield coaxial cable has the advantages that the aramid strength component is utilized, the anti-bending strength of the foaming sheath is improved, and the anti-bending fatigue limit is improved.

Description

The floating single screened coaxial cable of a kind of bending resistance

Technical field

The invention belongs to field of cables, be specially a kind of marine with the floating single screened coaxial cable of bending resistance.

Background technology

For floating screened coaxial cable, along with the fluctuation up and down of seawater, the bending strength that cable bears and fatigue limit should be higher than common shielded type cable far away.Present floating shielded type cable generally comprises inner wire, insulating barrier, outer conductor and plays the foaming body of floating effect, and the character of foaming body itself has brought bending resistance bad, can not adapt to the frequent bending that seawater fluctuates and brings, thereby cause fractureing of cable conductor.

Summary of the invention

The object of the present invention is to provide a kind of marine with the floating single screened coaxial cable of bending resistance, the bending resistance that the existing floating shielded type cable of solution at sea uses is bad, can not adapt to the frequent bending that seawater fluctuates and brings, thereby cause problems such as fractureing of cable conductor.

Technical scheme of the present invention is:

The floating single screened coaxial cable of a kind of bending resistance is inner wire at the center of cable, and described inner wire is outward insulating barrier, described insulating barrier is outward outer conductor, and described outer conductor is outward oversheath, and described oversheath is outward strength member, described strength member is outer skinning outward, and described outer skinning is the foaming skin outward.

Described strength member material is aramid fiber.

The invention has the beneficial effects as follows:

The present invention has increased strength member, and described strength member material adopts aramid fiber (PPTA Aramid fiber).Utilize strength member to improve the overall bending strength of foaming skin and cable, improved bending fatigue limit.According to test, cable performance of the present invention is as follows:

1. cable intensity

1.1 stretch breaking strength 〉=9kN

1.2 shear strength: oversheath, aramid fiber strength member, outer skinning, foaming layer between any two＞1000N/m; Between other object 〉=150N/30cm.

2. bending property: bending radius is not more than 165mm.

3. density: 800 ± 50kg/m3, after the watertight test, density is no more than 850kg/m3.

4 watertightnesses: kept 2 hours under 4.4MPa hydraulic pressure, cable is laterally water-tight, and aramid layers is vertically water-tight with interior (not containing aramid layers).

5. cable properties impedance 50 ± 2.5 Ω (f=10MHz).

6. attenuation constant＜0.06dB/m(f=30MHz).

7. outer conductor D.C. resistance≤23.0 Ω/km.

Core and the shielding between insulation resistance＞10000M Ω km.

9. proof voltage intensity: should satisfy exchanging 50Hz between conductor and the shielding, 1kV, 1min does not puncture.

10. environmental suitability: working temperature :-35 ℃ ^-+ 65 ℃; Storage temperature :-50 ℃ ^-+ 70 ℃.

Description of drawings

Figure l is structure chart of the present invention;

Among the figure, 1-inner wire, 2-insulating barrier, 3-outer conductor, 4-oversheath, 5-aramid fiber strength member,

6-outer skinning, 7-foaming skin.

Embodiment

As shown in Figure 1, the floating single screened coaxial cable of bending resistance of the present invention, be inner wire 1 at the center of cable, be insulating barrier 2 outside the described inner wire 1, being outer conductor 3 outside the described insulating barrier 2, is oversheath 4 outside the described outer conductor 3, is strength member 5 outside the described oversheath 4, be outer skinning 6 outside the described aramid fiber strength member 5, be foaming skin 7 outside the described outer skinning 6.

Described strength member 5 materials are aramid fiber.

Claims (2)

1. floating single screened coaxial cable of bending resistance, it is characterized in that: be inner wire at the center of cable, described inner wire is outward insulating barrier, described insulating barrier is outward outer conductor, described outer conductor is outward oversheath, described oversheath is outward strength member, and described strength member is outer skinning outward, and described outer skinning is the foaming skin outward.

2. cable according to claim 1, it is characterized in that: described strength member material is aramid fiber.

Images