CN201084482Y - A buoyancy cable - Google Patents

Abstract

The utility model relates to a buoyancy cable, comprising a cable core, an internal sheath and an external sheath, wherein, the cable core comprises a plurality of conductors covered with protective insulation layer and filling for filling the gaps among the conductors, as well as a water resistant layer for protecting the conductors and the filling; the internal sheath is arranged outside the water resistant layer; a fibre layer and a wrapping layer are arranged between the internal sheath and the external sheath from inside to outside. The utility model has the advantages of frequent-bending resistance and damage proof due to good flexibility, effective protection of cable core and ideal mechanical strength due to the internal sheath, the fibre layer, the wrapping layer and the external sheath arranged outside the water resistant layer in order. The utility model is suitable for power transmission in the operation of sea floor exploration, sea rescue and salvage and scientific research.

Description

buoyancy cable

technical field

The utility model relates to a buoyancy cable, which is suitable for power transmission in operations such as seabed exploration, marine rescue, salvage, scientific research and the like.

Background technique

Marine operations take deep-sea oil drilling, oil and gas, and combustible ice exploration as examples. They are usually carried out in waters of hundreds of meters or even thousands of meters. In addition to necessary hardware facilities such as equipment and instruments, such operations also need to use power transmission equipment. cable. The requirements for cables used in this environment are often very strict. Previously, people generally used power cables with steel wire or tinned steel tape as the armor layer as the power transmission carrier in various marine operations. The advantage is that it is strong and can prevent the cable from being broken due to its own gravity, but at the same time, it has the disadvantages of poor flexibility and bulkiness. In use, it is necessary to set up supports for the cable, which will cause trouble to marine operations. Therefore, people have aroused deeper attention to the cables for the above-mentioned applications, which mainly focus on the following three aspects: first, they have good buoyancy; second, they have good flexibility; third, they have ideal mechanical strength; fourth, they are water-resistant. Strong performance.

China Patent Authorization Announcement No. CN2610459Y recommends a floating water cable. This technical solution is aimed at the prior art in which the conductive wire core is arranged at the center of the cable cross section, and the floating core is arranged between the conductive wire core and the outer sheath. The heat dissipation effect of the conductive wire core is not ideal, and its structural setting is: the conductive wire core is evenly distributed between the floating core and the outer sheath. The patented solution can meet the technical problem that the buoyancy of the cable in seawater is sufficient to offset its own gravity, that is, the overall density of the cable is less than 1, and it also helps to dissipate heat from the conductive core. However, the applicant believes that the floating cable recommended by the above-mentioned patent is not suitable for use as an electric energy transmission carrier in operations such as seabed drilling, seabed natural gas survey, marine rescue, salvage, and scientific research due to the following deficiencies. One of its deficiencies is that it is difficult to meet the flexible requirements that the cable should have that is frequently bent and not easy to cause damage, because it is difficult to resist frequent bending with only a layer of outer sheath outside the conductive core; Although moving between the floating core and the outer sheath is helpful for the heat dissipation of the conductive wire core, it is objectively unfavorable for the protection of the conductive wire core. Once the outer sheath is damaged, the conductive wire core will be affected, and because the cable The application occasion or the environment is in sea water, so the temperature rise of the cable is not the focus of the problem; third, the water resistance effect is very fragile, once the sea water seeps into the outer sheath, the function of the conductive core will be paralyzed State; Fourth, since the patented floating cable is wholly or completely floating on the water surface in use, it seems that there is no need to be too demanding on the mechanical strength, but when it is applied to the above-mentioned occasions of the applicant, it must be very particular strength.

Contents of the invention

The task of the utility model is to provide a kind of buoyancy cable with good flexibility to meet the requirements of frequent bending without damage, safe and reliable protection of the cable core, preventing seawater from invading the conductive core, and ideal mechanical strength buoyancy cable.

The task of the utility model is accomplished in this way, a buoyancy cable, which includes a cable core composed of a conductor covered with an insulating sheath and a filler for filling the gaps between the conductors. The inner and outer sheaths are characterized in that: the cable core also includes a water-blocking layer for protecting the conductors and fillers, the inner sheath is located outside the water-blocking layer, and the inner and outer A fiber layer and a wrapping layer are sequentially arranged between the sheaths from inside to outside.

In a specific embodiment of the present utility model, the conductor is a bundled wire twisted from any one of annealed bare copper wire and tinned copper wire with a diameter of 0.1-1mm, or a bundled wire A stranded wire formed by intertwisting with bundled wires.

In another specific embodiment of the present utility model, the filler is water-blocking yarn.

In yet another specific embodiment of the present utility model, the material of the insulating sheath is polyolefin or polyethylene or polyvinyl chloride.

In yet another specific embodiment of the present utility model, the water blocking layer is polyester wrapping tape or non-woven fabric.

In yet another specific embodiment of the present invention, the material of the inner sheath is polyolefin or polyethylene or polyvinyl chloride.

In a further specific embodiment of the present utility model, the thickness of the fiber layer is 3-5 mm, and it is located outside the inner sheath.

In a further specific embodiment of the present invention, the fibers used in the fiber layer are high-strength fibers, and the high-strength fibers are aramid fibers.

In yet another specific embodiment of the present utility model, the wrapping layer is a non-woven fabric or a polyester wrapping tape, which is wrapped and fixed on the outside of the fiber layer.

In yet another specific embodiment of the present utility model, the material of the outer sheath is polyethylene or polypropylene or rubber.

The technical solution disclosed by the utility model has good flexibility and can meet the requirement of withstanding frequent bending without damage; Layer, outer sheath, so that the cable core can be effectively protected and the mechanical strength is ideal.

Description of drawings

The accompanying drawing is a cross-sectional view of the buoyancy cable of the present utility model.

Detailed ways

In order to enable your examiners, especially the public, to further understand the structural features and beneficial effects of the utility model, the specific implementation of the utility model is described in detail as follows in conjunction with the accompanying drawings and examples:

Example 1:

Please refer to the accompanying drawings in detail. It can be clearly seen from the profile of the cable structure, that is, the cross section, that the cable core 1 is located in the center, and the number of insulated wire cores of the cable core 1 can be 1-7. The present embodiment chooses 3 insulated wire cores, the cable core 1 includes a conductor 11 covered with an insulating layer 111, a filler 12, and a water-blocking layer 13. Tinned copper wires with a diameter of 0.25 mm are first twisted into bundled wires (also called bundled wires) ), and then re-twisted the bundled wires twisted by itself, so as to obtain the stranded wire, that is, the conductor 11. On the outside of the conductor 11, the polyolefin or polyethylene or polyvinyl chloride material is coated on the conductor by using the usual equipment in the wire and cable industry. 11 forms a coating insulating layer 111 outside, and this example adopts polyvinyl chloride. The water-blocking yarn is used as filler 12 to fill the gaps formed between the three cable cores 1. The water-blocking yarn is a water-soluble swelling material with good water-absorbing swelling properties. A water-blocking layer 13 (non-woven fabric) is provided outside the cable core 1 to prevent seawater from intruding into the conductor 11 .

More specifically, the inner sheath 2 is extruded outside the cable core 1 shown in the figure, and the material of the inner sheath 2 is polyolefin or polyethylene or polyvinyl chloride. In this embodiment, polyvinyl chloride is selected. , extruded to the outside of the cable core 1 with commonly used equipment and techniques in the wire and cable industry. The outside of the inner sheath 2 is a fiber layer 3 of aramid fiber (also known as Kevlar) with a thickness of 3 mm and belongs to the category of high-strength fibers. The fiber layer 3 is wrapped with non-woven fabric as the wrapping layer 4, The outer sheath 5 is formed by extruding polyethylene around the cladding layer 4 . Thus, a buoyant cable suitable for marine operations is obtained.

Example 2:

The figure is omitted, only the number of insulated wire cores of the cable core 1 is changed to 4, annealed bare copper wires with a diameter of 0.9mm are used, and each annealed bare copper wire is twisted into bundles, thereby forming the conductor 11 of the cable core 1 , the insulating sheath 111 is changed to polyolefin, the water blocking layer 13 is polyester wrapping tape, the material of the inner sheath 2 is changed to polyolefin, the thickness of the fiber layer 3 is changed to 4mm, and the wrapping layer 4 is wrapped with polyester Tape, the material of outer sheath 5 is used polypropylene instead, and all the other are all the same as the description to embodiment 1.

Example 3:

The diagram is omitted, only the number of the cable core 1 is changed to 5, the material of the conductor 11 constituting the cable core 1 is changed to a bare copper wire with a diameter of 0.68 mm, the insulating sheath 111 is changed to polyethylene, and the material of the inner sheath 2 is changed to Polyethylene is used, the thickness of the fiber layer 3 is 5mm, the wrapping layer 4 adopts polyester wrapping tape, the material of the outer sheath 5 is changed to rubber, and the rest are the same as the description of embodiment 1.

The buoyancy cable obtained from the above examples has been tested, and its flexibility: minimum bending radius ≥ 6 times the outer diameter of the cable; water resistance: meet the water seepage test of the standard YD/T837.4-1996; minimum breaking load ≥ 2000kg; Density in seawater: ≤1.10g/cm ³ .

Claims (10)

1. buoyancy cable; it comprises the cable core (1) that is made of conductor (11) that is coated with insulation sheath (111) and the filler (12) that is used for that the space between the conductor (11) is filled, the inside and outside sheath (2,5) outside cable core (1); it is characterized in that described cable core (1) also includes is used for water blocking layer (13) that described conductor (11), filler (12) are protected; described inner sheath (2) is positioned at outside the water blocking layer (13), is sequentially provided with fibrage (3) and lapping layer (4) between inside and outside sheath (2,5) from inside to outside.

2. buoyancy cable according to claim 1 is characterized in that described conductor (11) is annealing bare copper wire and the stranded bunch that forms of any one copper wire in the tinned copper wire by diameter 0.1-1mm, and perhaps bunch and bunch twist and the twisted wire of formation mutually.

3. buoyancy cable according to claim 1 is characterized in that described filler (12) is a water blocking yarn.

4. buoyancy cable according to claim 1, the material that it is characterized in that described insulation sheath (111) are polyolefin or polyethylene or polyvinyl chloride.

5. buoyancy cable according to claim 1 is characterized in that described water blocking layer (13) is polyester twining package tape or nonwoven fabrics.

6. buoyancy cable according to claim 1, the material that it is characterized in that described inner sheath (2) are polyolefin or polyethylene or polyvinyl chloride.

7. buoyancy cable according to claim 1 is characterized in that the thickness of described fibrage (3) is 3-5mm, is positioned at outside the inner sheath (2).

8. according to claim 1 or 7 described buoyancy cables, it is characterized in that the used fiber of described fibrage (3) is a high strength fibre, described high strength fibre is an aramid fiber.

9. buoyancy cable according to claim 1 is characterized in that described lapping layer (4) is nonwoven fabrics or polyester twining package tape, and Bao Gu is outside fibrage (3).

10. buoyancy cable according to claim 1, the material that it is characterized in that described oversheath (5) are polyethylene or polypropylene or rubber.

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