CN203055505U - A bending-resistant floating double-shielded coaxial cable - Google Patents

Abstract

The utility model discloses a bending-resistant floating double-shielding coaxial cable, aiming to solve the problem of small bending-resistant fatigue limit of offshore floating cables. An inner conductor is arranged in the center of the cable, an insulating layer is arranged outside the inner conductor, a first outer conductor is arranged outside the insulating layer, an inner sheath is arranged outside the first outer conductor, a second outer conductor is arranged outside the inner sheath, an outer sheath is arranged outside the second outer conductor, a strength member is arranged outside the outer sheath, an outer skinning is arranged outside the strength member, and a foam skin is arranged outside the outer skinning; and the strength member is made of aramid fiber. The bending-resistant floating double-shielding coaxial cable improves the bending strength of the foam skin and improves the bending strength of the by utilizing the strength member made of aramid fiber.

Description

A bending-resistant floating double-shielded coaxial cable

technical field

The utility model belongs to the field of cables, in particular to a bending-resistant floating double-shielded coaxial cable for sea use.

Background technique

For floating shielded coaxial cables, as the sea water fluctuates up and down, the bending strength and fatigue limit of the cables should be much higher than ordinary shielded cables. Current floating shielded cables generally include an inner conductor, an insulating layer, an outer conductor, and a foam that plays a floating role. However, the nature of the foam itself has poor bending resistance and cannot adapt to the frequent fluctuations caused by seawater floating up and down. bending, resulting in breakage of the cable conductors.

Utility model content

The purpose of the utility model is to provide a bending-resistant floating double-shielded coaxial cable for use in the sea, which solves the problem that the existing floating shielded cable has poor bending resistance when used at sea, and cannot adapt to frequent bending caused by floating up and down in sea water, resulting in cable failure. Conductor breakage, etc.

The technical scheme of the utility model is:

A bending-resistant floating double-shielded coaxial cable, the center of the cable is an inner conductor, the outer part of the inner conductor is an insulating layer, the outer part of the insulating layer is a first outer conductor, and the outer part of the first outer conductor is an inner sheath , outside the inner sheath is a second outer conductor, outside the second outer conductor is an outer sheath, outside the outer sheath is a strength member, outside the strength member is an outer crust, and the outer crust The outside is foam leather.

The strength member material is aramid.

The beneficial effects of the utility model are:

The utility model adds a strength member, and the material of the strength member is aramid fiber (poly-paraphenylene terephthalamide Aramid fiber). The overall bending strength of the foam skin and the cable is improved by using the strength member, and the bending fatigue limit is improved. According to the test, the cable performance of the present utility model is as follows:

1. Cable strength

1.1 Breaking strength ≥ 9kN.

1.2 Shear strength: >1000N/m between two pairs of outer sheath, aramid strength member, outer crust, and foam layer; ≥150N/30cm between other objects.

2. Bending performance: the bending radius is not greater than 165mm.

3. Density: <850kg/m3, after the watertight test, the density shall not exceed 900kg/m3.

4. Watertightness: Under 4.4MPa water pressure for 2 hours, the cable will not leak in the horizontal direction, and the inside of the aramid layer (excluding the aramid layer) will not leak in the vertical direction.

5. The characteristic impedance of the cable is 50±2.5Ω (f=10MHz).

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

7. The series resistance of inner and outer conductors is less than 50.0Ω/km.

8. Insulation resistance between core and shield > 10000MΩ·km; between two outer conductors > 300MΩ·km.

9. Withstand voltage strength: between the conductor and the shield should meet AC 50Hz, 1kV, 1min without breakdown.

10 Isolation: When the first outer conductor is used as the common ground, the isolation between the core wire and the second conductor meets:

When 10kHz≤f≤120kHz, the isolation is ≥45dB;

When 2MHz≤f≤30MHz, the isolation is ≥35dB.

11. Environmental adaptability: working temperature: -35°C-+65°C; storage temperature: -50°C-+70°C.

Description of drawings

Fig. 1 is a structural diagram of the utility model;

In the figure, 1—inner conductor, 2—insulation layer, 3—first outer conductor, 4—inner sheath, 5—second outer conductor, 6—outer sheath, 7—aramid strength member, 8—outer junction Leather, 9—foamed leather.

Detailed ways

As shown in Figure 1, the bending-resistant floating single-shielded coaxial cable of the present invention has an inner conductor 1 at the center of the cable, an insulating layer 2 outside the inner conductor, and a first outer conductor 3 outside the insulating layer 2. The outside of the first outer conductor 3 is an inner sheath 4, the outside of the inner sheath 4 is a second outer conductor 5, the outside of the second outer conductor 5 is an outer sheath 6, and the outside of the outer sheath 6 is A strength member 7, the outside of the strength member 7 is an outer crust 8, and the outside of the outer crust 8 is a foam skin 9.

The material of the strength member 7 is aramid fiber.

Claims (2)

1. floating double shielded 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 first outer conductor, and described first outer conductor is outward inner sheath, and described inner sheath is outward second outer conductor, described second 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.

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