CN112735655B

CN112735655B - Marine towing rope

Info

Publication number: CN112735655B
Application number: CN202011530707.5A
Authority: CN
Inventors: 蒋峰; 顾春飞; 牛学超; 邱兴宇; 胡明; 花炜
Original assignee: Zhongtian Technology Submarine Cable Co Ltd
Current assignee: Zhongtian Technology Submarine Cable Co Ltd
Priority date: 2020-12-22
Filing date: 2020-12-22
Publication date: 2023-06-27
Anticipated expiration: 2040-12-22
Also published as: CN112735655A

Abstract

The invention provides a marine towing cable, which comprises a bearing unit, a plurality of wire core units, a first protective layer, a fiber layer and a second protective layer, wherein the bearing unit, the plurality of wire core units, the first protective layer, the fiber layer and the second protective layer are sequentially arranged from inside to outside, and the plurality of wire core units are distributed at intervals in the circumferential direction of the bearing unit; and a first water-resisting layer is filled between the first protective layer and the bearing unit, and the first water-resisting layer is fixedly connected with the first protective layer. The marine towing cable provided by the invention has better waterproof performance.

Description

Marine towing rope

Technical Field

The invention relates to the technical field of cables, in particular to a marine towing cable.

Background

Marine streamers are often used to survey the sea floor to acquire information about the sea floor's source, energy distribution, etc.

The streamer comprises a cladding, a protective layer and a load bearing layer, typically provided with a plurality of core units, which are encased outside the plurality of core units. And a water blocking layer is filled in the gap in the wrapping layer so as to prevent the core unit from water seepage. The wrapping layer surrounds the water blocking layer, so that the water blocking layer is round. The marine towrope has better tear resistance in the protective layer. The bearing layer is a steel wire armor layer and is used for bearing the stretching torsion of the marine towrope and the like.

However, the wrapping layer is easily separated from the protective layer and the waterproof layer, so that the marine cable is water-permeable and poor in waterproof performance.

Disclosure of Invention

In view of the foregoing, embodiments of the present invention provide a marine streamer that has improved waterproof performance.

In order to achieve the above object, the embodiment of the present invention provides the following technical solutions:

the embodiment of the invention provides a marine towing cable, which comprises a bearing unit, a plurality of wire core units, a first protective layer, a fiber layer and a second protective layer, wherein the bearing unit, the plurality of wire core units, the first protective layer, the fiber layer and the second protective layer are sequentially arranged from inside to outside, and the plurality of wire core units are distributed at intervals in the circumferential direction of the bearing unit; and a first water-resisting layer is filled between the first protective layer and the bearing unit, and the first water-resisting layer is fixedly connected with the first protective layer.

Compared with the prior art, the marine streamer provided by the embodiment of the invention has the following advantages: through setting up the bearing unit in the inside of marine streamer, can protect the bearing unit, avoid the bearing unit to break under external force striking or wearing and tearing's the circumstances, improve marine streamer's life. And because the bearing unit is arranged at the central part of the marine towing cable, a tester can conveniently install the detection equipment at any position of the marine towing cable along the length direction, and the use is convenient. The first protective layer is directly formed outside the first water blocking layer and is fixedly connected with the water blocking layer, no gap exists between the first protective layer and the water blocking layer, separation water seepage between the first water blocking layer and the first protective layer is avoided, and the waterproof performance of the marine towing cable is improved.

In some alternative embodiments, the first water-blocking layer and the first protective layer are bonded and fixed during the solidification process.

In some alternative embodiments, any adjacent two of the core units are spaced apart along the circumference of the streamer, and the load carrying units, the core units, and the first protective layer are spaced apart along the radial direction of the streamer.

In some alternative embodiments, the core unit includes a power supply unit and a data unit for transmitting signals.

In some optional embodiments, the wire core unit comprises a first wire core, a second water-resistant layer and a wrapping layer, which are sequentially arranged from inside to outside; and the inner side and the outer side of the wrapping layer are fixedly connected with the second water-resisting layer and the first water-resisting layer respectively.

In some alternative embodiments, the core unit includes a ground unit.

In some optional embodiments, the grounding unit includes a second wire core, a semiconductive layer, and a third protective layer sequentially disposed from inside to outside.

In some alternative embodiments, the first protective layer is a foam.

In some alternative embodiments, the first protective layer has a density of less than or equal to 0.7g/cm ³ 。

In some alternative embodiments, the bearing unit comprises a fiber bundle and a fourth protective layer surrounding the fiber bundle, and the fourth protective layer is fixedly connected with the first water-resistant layer.

In some alternative embodiments, the plurality of core units includes at least a power supply unit, a ground unit, and a data unit for conveying signals.

In some alternative embodiments, the plurality of core units further comprises an optical fiber communication unit.

In some alternative embodiments, a plurality of shield protrusions are disposed on an outer wall surface of the second shield layer, the plurality of shield protrusions being disposed at intervals along a circumferential direction of the second shield layer, each of the shield protrusions extending along a length direction of the streamer.

In some alternative embodiments, the circumferential spacing between two adjacent guard projections is greater than the projection width of the guard projections.

In addition to the technical problems, features, and advantages of the embodiments of the present invention described above, other technical problems, features, and advantages of the features that may be solved by the marine streamer provided by the embodiments of the present invention will be described in further detail in the detailed description of the embodiments.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic illustration of a marine streamer provided by an embodiment of the invention;

fig. 2 is a schematic structural diagram of a marine streamer external connection detection device according to an embodiment of the present invention.

Reference numerals:

1: a marine streamer;

10: a force bearing unit; 11: a fiber bundle; 12: a fourth protective layer;

20: a core unit; 21: a first wire core; 22: a second water blocking layer; 23: wrapping the layer; 24: filling the core; 25: a second wire core; 26: a semiconductive layer; 27: a third protective layer; 210: a power supply unit; 220: a grounding unit; 230: a data unit;

30: a first protective layer;

40: a fibrous layer;

50: a second protective layer; 51: a protective protrusion;

60: a first water blocking layer;

70: and a detection device.

Detailed Description

In order to make the above objects, features and advantages of the embodiments of the present invention more comprehensible, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the prior art, a wrapping layer is arranged between the water-resistant layer and the protective layer and is used for enabling the water-resistant layer to be round. However, the wrapping layer and the protective layer cannot be connected in a fastening manner, the wrapping layer and the protective layer are easy to separate from each other due to torsion, stretching and the like of the marine towing cable, once the protective layer is damaged or the end head of the marine towing cable is damaged, seawater can enter along a separation gap, external equipment on the whole cable is damaged, even terminal equipment is damaged, and the marine towing cable has poor water blocking performance.

In view of this, in this application embodiment, the water-blocking layer is directly fixed with the inoxidizing coating bonding, and there is no gap between the two, avoids moisture infiltration, has improved marine streamer's water-blocking performance.

FIG. 1 is a schematic diagram of a marine streamer provided by an embodiment of the invention. Fig. 2 is a schematic structural diagram of a marine streamer external connection detection device according to an embodiment of the present invention.

Referring to fig. 1 and 2, the present embodiment provides a marine streamer 1, which includes a bearing unit 10, a plurality of core units 20, a first protective layer 30, a fiber layer 40 and a second protective layer 50 sequentially arranged from inside to outside, wherein the plurality of core units 20 are distributed at intervals in the circumferential direction of the bearing unit 10; a first water-resistant layer 60 is further filled between the first protective layer 30 and the bearing unit 10, and the first water-resistant layer 60 is fixedly connected with the first protective layer 30.

Specifically, the load-bearing unit 10 is used to bear the tension, torsion, etc. of the marine streamer 1, so as to avoid the breaking of the marine streamer 1. The load carrying unit 10 is located in the central portion of the streamer 1, which is not subject to seawater erosion or foreign object impact damage. In this way, even if the outer layer of the streamer 1 is damaged, the centrally located load carrying unit 10 will not break, which is easy to repair, improving the service life of the streamer 1.

A plurality of core units 20 are circumferentially enclosed outside the load carrying unit 10 along the circumference of the streamer 1. In some alternative embodiments, the plurality of core units 20 includes at least a power supply unit 210, a ground unit 220, and a data unit 230 for transmitting signals. Wherein a variety of detection devices, such as detectors and the like, are typically attached to the streamer 1. The power supply unit 210 is used to power detection devices connected to the streamer 1. The grounding unit 220 grounds the detection devices, induces a residual electric field in the streamer 1, and protects the detection devices and termination devices. The data unit 230 is used for transmitting control signals and data information. In some alternative embodiments, the plurality of core units 20 further include an optical fiber communication unit, with a larger signal transmission capacity.

The number of the power supply unit 210, the grounding unit 220, the data unit 230, and the optical fiber communication unit may be set as required. Illustratively, the number of the grounding units 220 may be two, the number of the data units 230 may be two, the number of the power supply units 210 may be four, and the number of the optical fiber communication units may be one, which is not limited in this embodiment.

The first protection layer 30 surrounds the outer sides of the plurality of core units 20 to form protection for the plurality of core units 20. The detector can be made of hard elastic materials, such as polyurethane, has good compression resistance and rebound resilience, good sound transmission effect and good detection effect of detection equipment such as detectors.

The fiber layer 40 is disposed outside the first protective layer 30 to improve the torsional and tear resistance of the streamer 1. The fiber layer 40 may be aromatic polyamide fiber, aramid fiber, etc. with high strength.

The second protective layer 50 surrounds the fibrous layer 40 and may be in direct contact with sea water or be impacted by foreign objects. The marine streamer 1 can be made of high-hardness materials, such as polyurethane, and has high wear resistance, high tearing resistance and high protection performance.

And the materials of the first protective layer 30 and the second protective layer 50 are compatible, so that the materials of the first protective layer 30 or the second protective layer 50 can be mutually adhered through the fiber layer 40 in the process of manufacturing the marine streamer 1, and the first protective layer 30, the fiber layer 40 and the second protective layer 50 are prevented from being mutually separated, so that moisture is prevented from penetrating. And the first armor layer 30, the fibrous layer 40, and the second armor layer 50 are fixedly coupled to one another to enhance tear and torsional resistance of the streamer 1.

The first water blocking layer 60 is further filled between the first protective layer 30 and the bearing unit 10, that is, each core unit 20 is wrapped with a water blocking material, so that water is prevented from penetrating into the core unit 20 through the first protective layer 30, and the marine streamer 1 has good water blocking performance. At the same time, the first water barrier 60 is distributed along the length of the streamer 1, providing longitudinal water blocking of the streamer 1.

The first water-blocking layer 60 can be made of a high-performance water-blocking material, has stronger toughness and viscosity, and can be effectively adhered and fixed with the wire core unit 20, the bearing unit 10 and the first protective layer 30, so that the phenomenon of separation is avoided.

In some alternative embodiments, the first water barrier layer 60 and the first protective layer 30 are adhesively secured during the setting process. When the marine towline 1 is molded, the first water-blocking layer 60 is filled and molded through a high-temperature filling process, at this time, the first water-blocking layer 60 is not cooled and molded yet has viscosity and fluidity, and a release film is arranged outside the first water-blocking layer 60, so that the first water-blocking layer 60 has better roundness. The first protective layer 30 may then be extrusion molded while peeling the release film. Thus, the first water-blocking layer 60 and the first protective layer 30, which are still adhesive, are adhered to each other, and since the first water-blocking layer 60 and the first protective layer 30 still have fluidity, they can mutually fill the gap at the molding position. Thus, after the marine towline 1 is molded, the first water-blocking layer 60 and the first protective layer 30 are firmly bonded, no gap exists between the first water-blocking layer 60 and the first protective layer 30, separation and moisture infiltration between the first water-blocking layer 60 and the first protective layer 30 are avoided, and the water-blocking performance of the marine towline 1 is high.

It will be appreciated that during the formation of the first water-resistant layer 60 and the first protective layer 30, the first water-resistant layer 60 and the first protective layer 30 are in fluid fusion with each other, and the boundary therebetween is not a round cylindrical surface. So long as the first water barrier layer 60 can completely encapsulate the plurality of core units 20. For example, if the first water blocking layer 60 and the first protective layer 30 have rounded boundaries, the boundary between the first water blocking layer 60 and the first protective layer 30 may be as shown by the dotted line in fig. 1, and the radial dimension of the first water blocking layer 60 may be greater than the outer edge dimension of the core unit 20.

It will be appreciated that when the load carrying units 10 of the streamers 1 are disposed on the outer layer, such as the outermost layer of the streamers 1, then the detection apparatus can only be connected at the interface of two adjacent streamers 1 when it is desired to circumscribe the detection apparatus on the streamers 1, which is inconvenient to use. According to the embodiment of the application, the bearing unit 10 is arranged at the central part of the marine towing cable 1, the wire core unit 20 is arranged at the radial outer side of the bearing unit 10, and the marine towing cable 1 can be conveniently connected with detection equipment at any part along the length direction without damaging the bearing unit 10, so that the marine towing cable is convenient to use and high in flexibility.

Specifically, the operation method of the external detection device is as follows:

first, the position to be treated of the external detection device on the marine towing cable 1 is selected.

Sequentially stripping the second protective layer 50, the fiber layer 40 and the first protective layer 30 at the position to be treated, and removing the first water-resistant layer 60 at the position to be treated to expose the wire core unit 20 at the position to be treated; and welding and insulating the wire core unit 20 and the detection equipment according to the wiring principle of the detection equipment.

Since the detection device is generally of a HALF structure, after the wiring process is completed, the detection device is folded and wrapped on the core unit 20 to be connected.

Cleaning impurities on the second protective layers 50 at the two ends of the position to be treated, pouring a vulcanized material at the position to be treated by adopting injection molding or mould pressing and the like through a mould, so that the vulcanized material is fully contacted with polyurethane on the second protective layers 50 at the two ends of the position to be treated; and (3) maintaining the temperature for a set time at the vulcanization temperature until the temperature is completely vulcanized, and removing the die to finish the processing flow of the external detection equipment.

In some alternative embodiments, any adjacent two core units 20 are spaced apart along the circumference of the streamer 1, and the load bearing units 10, core units 20, and first armor layer 30 are spaced apart along the circumference of the streamer 1. That is, the adjacent two core units 20 are disposed at intervals along the circumferential direction of the core units 20, so that friction and abrasion between the core units 20 and the load-bearing units 10 are avoided. Meanwhile, the outer circumference of the core unit 20 is wrapped with a water blocking material to form protection to the core unit 20.

In some alternative embodiments, the power supply unit 210 and the data unit 230 are similar in structure, and each includes a first wire core 21, a second water-blocking layer 22 and a wrapping layer 23 sequentially arranged from inside to outside; the inner and outer sides of the wrapping layer 23 are fixedly connected with the second water blocking layer 22 and the first water blocking layer 60, respectively.

The number and kind of the first wire cores 21 may be set according to the requirements of the power supply unit 210 and the data unit 230 to adapt to the use of different detection devices. The core unit 20 is provided with a second water-blocking layer 22 and a wrapping layer 23, and even if the marine streamer 1 is externally connected with detection equipment, radial water blocking can be realized through vulcanization sealing between the second water-blocking layer 22 and the second protective layer 50 and the detection equipment.

That is, by providing the first water blocking layer 60 in the streamer 1 and the second water blocking layer 22 in the core unit 20, a variety of water blocking effects of the streamer 1 are achieved, with good water blocking properties.

For example, the data unit 230 may include four first wire cores 21 of the same specification, and the four first wire cores 21 are disposed along a circumferential direction of the data unit 230. The four first wire cores 21 are sheathed with a wrapping layer 23, and a second water-resistant layer 22 is filled between gaps of each first wire core 21 in the wrapping layer 23.

To make the data unit 230 more round, the inside of the four first wire cores 21 is also provided with a filler core 24, i.e. the filler core 24 is located in the center of the data unit 230.

The first core 21 includes a conductor and an insulating sheath covering the conductor. The conductor may be oxygen-free copper, tin-plated copper, silver-plated copper, etc. Optionally, in this embodiment, the conductor is formed by twisting a plurality of five silver-plated copper wires. The silver-plated copper has better conductivity, so that the heating efficiency of the conductor can be effectively reduced, and the silver-plated copper also has weldability, so that the welding of the detection equipment and the first wire core 21 is facilitated when the detection equipment is externally connected. Silver-plated copper also has good corrosion resistance, and the corrosion of the conductor seawater at the position of the external detection equipment is avoided. The insulating sheath can be made of polyolefin materials, and has good insulating property.

The wrapping layer 23 may be made of a wrapping tape compatible with the water-blocking material, so that the data unit 230 is round and convenient for turnover, and the wrapping tape made of the material is better bonded with the first water-blocking layer and the second water-blocking layer, so that the possibility of water permeation in the separation gap is avoided.

The first wire cores 21 and the filling cores are arranged at intervals, and the second water-blocking layer 22 is filled in the gaps in the wrapping layer 23, so that the peripheries of the first wire cores 21 and the filling cores are wrapped with water-blocking materials to protect the first wire cores 21. And still be favorable to external check out test set, make each first sinle silk 21 disperse, the material that the second water-blocking layer 22 can be the same with the material of first water-blocking layer 60, this embodiment is not limited.

The power supply unit 210 may also include four first wire cores 21 according to the power demand of the detection device. And the four first wire cores 21 include two large wire cores with larger diameters and two small wire cores with smaller diameters, which are sequentially arranged at intervals along the circumferential direction of the power supply unit 210. The winding layer 23 surrounds the two large wire cores and the two small wire cores, and the gaps between the first wire cores 21 in the winding layer 23 are filled with the second water-resistant layer 22. Since the diameters of the large wire core and the small wire core are different, the gap in the central portion of the power supply unit 210 is small, and a filling core may not be provided. The material, structure, etc. of the large wire core and the small wire core are similar to those of the first wire core 21 in the data unit 230, and the description thereof is omitted.

It is understood that the structure of the grounding unit 220 may be similar to that of the data unit 230 and the power supply unit 210.

In some alternative embodiments, the grounding unit 220 may not be provided with the second water blocking layer 22. Illustratively, the ground unit 220 includes a second core 25, a semiconductive layer 26, and a third protective layer 27. The structure and function of the first wire core 21 are similar to those of the above embodiment, and the description of this embodiment is omitted.

The material of the semiconductive layer 26 may be semiconductive polyolefin, so that the electric field distribution on the inner and outer sides of the second wire core 25 is relatively uniform.

The third protective layer 27 may be made of polypropylene having low toughness, and is extruded on the outer side of the semiconductive layer 26 so as not to adhere to the semiconductive layer 26. When the detection device is externally connected, the third protective layer 27 can be broken and peeled off easily, and the inner semiconductive layer 26 and the second wire core 25 are exposed.

Of course, when the outer diameter of the grounding unit 220 is significantly smaller than the data unit 230 and the power supply unit 210, the thickness of the third protective layer 27 in the grounding unit 220 may be increased and function as a filler so that the outer diameters of the data unit 230, the power supply unit 210 and the grounding unit 220 are approximately the same or equal. Thus, the marine streamer 1 has a round appearance and is easy to manufacture and mold.

In some alternative embodiments, the first protective layer 30 is a foam. Such as foamed polyurethane, such that a honeycomb or cellular structure may be formed within the first protective layer 30.

For the same thickness of the first protective layer 30, the weight of the foamed first protective layer 30 becomes smaller, and the specific gravity (the ratio of weight to volume) of the marine streamer 1 is reduced, for example, smaller than the density of water, so that the gravity of the marine streamer 1 is close to the buoyancy suffered by the marine streamer 1, and the marine streamer 1 is located at the same elevation as much as possible, and is prevented from being pulled by detection equipment. At the same time, the stress of the bearing unit 10 is reduced, and the service life is longer.

The specific gravity of the streamer 1 may be reduced even more by increasing the thickness of the first protective layer 30 during the shaping of the streamer 1, depending on the application requirements. For example, when the first protective layer 30 is at a preset thickness, the streamer 1 may be left in a floating state for surface towing.

In some alternative embodiments, the first protective layer 30 has a density of less than or equal to 0.7g/cm ³ 。

In some alternative embodiments, the load bearing unit 10 includes a fiber bundle 11 and a fourth protective layer 12 surrounding the fiber bundle 11, and the fourth protective layer 12 is fixedly connected to the first water blocking layer 60.

The fiber bundle 11 may be made of high-strength fibers such as aramid fibers and PBO (Poly-p-phenylene benzobisoxazole) fibers, and has high tensile strength. Meanwhile, the weight of the fiber bundle 11 is small, compared with the bearing unit made of steel wires in the prior art, the bearing unit made of steel wires is difficult to realize long-length production due to the fact that the self weight of the bearing unit is large, the bearing unit 10 in the embodiment can enable the weight of the marine towing cable 1 to be small, the production with a larger length is realized, and meanwhile the bending performance of the fiber bundle is better.

The fourth protective layer 12 may be made of a material having waterproof and easily vulcanizable properties such as polyurethane, vulcanized rubber, and polyester rubber (TPEE), so that the fiber bundles 11 are prevented from being filled with water. At the same time, when the fibre bundle 11 of the streamer 1 is connected to the load bearing head, a vulcanisation seal may be applied at the connection point to prevent water ingress at the connection point.

Specifically, the forming process of the bearing unit 10 is as follows: the fibres are twisted under tension into a round bundle 11, and are strapped with two fibre threads, and finally a fourth protective layer 12 is extruded simultaneously. The twisting, bundling and extrusion are all accomplished simultaneously with the fibers under tension, so that the fiber bundle 11 has a high strength and a good roundness.

In exploration, a plurality of streamers 1 are usually provided, and torsion of the streamers 1 or sticking, winding, etc. between two adjacent streamers 1 may occur. Twisting of the streamers 1 may cause the streamers 1 to break, the conformable wrapping between two adjacent streamers 1, etc., may increase crosstalk between two adjacent streamers 1 to some extent, survey signal attenuation, etc.

In some alternative embodiments, the outer wall surface of the second protective layer 50 is provided with a plurality of protective protrusions 51, and the plurality of protective protrusions 51 are arranged at intervals along the circumferential direction of the second protective layer 50, and each protective protrusion 51 extends along the length direction of the marine streamer 1.

Thus, even if two streamers 1 are wound or attached, the two streamers 1 are in contact with each other through the tip of the shielding bump 51, and the space between the two streamers 1 is the bump height of the shielding bump 51, so that crosstalk interference between the two streamers 1 is reduced.

The end of the shield lobe 51 facing away from the streamer 1 may be rounded to avoid scratching or puncturing the streamer 1 when the shield lobe 51 is in contact with the streamer 1.

At the same time, the protective projections 51 do not significantly increase the weight of the streamer 1, do not affect the sound transmission performance of the streamer 1, and are low cost. Furthermore, the protective protrusions 51 may also have an anti-wear effect, for example, the marine streamer 1 may wear preferentially with the protruding protective protrusions 51 during towing, and may provide a protective effect for the second protective layer 50. And when the marine towline 1 is twisted, the protection bulge 51 is correspondingly twisted, so that a detector can easily observe the twisting degree of the marine towline 1, and the marine towline 1 can be turned right in time, and the damage to the marine towline 1 is avoided.

The projection height of the shield projection 51 may be set as needed. In some alternative embodiments, the circumferential spacing of adjacent two guard projections 51 is greater than the projection width of the guard projections 51.

In this way, even if the shield projections 51 between two streamers 1 are mutually spliced, there is still a gap between adjacent two shield projections 51, reducing crosstalk interference between the two streamers 1.

In this specification, each embodiment or implementation is described in a progressive manner, and each embodiment focuses on a difference from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.

Claims

1. The marine towline is characterized by comprising a bearing unit, a plurality of wire core units, a first protective layer, a fiber layer and a second protective layer which are sequentially arranged from inside to outside, wherein the plurality of wire core units are distributed at intervals in the circumferential direction of the bearing unit;

a first water-resisting layer is also filled between the first protective layer and the bearing unit, and the first water-resisting layer is fixedly connected with the first protective layer;

the first waterproof layer and the first protective layer are bonded and fixed in the solidification forming process;

the bearing unit comprises a fiber bundle and a fourth protective layer which is enclosed outside the fiber bundle, and the fourth protective layer is fixedly connected with the first water-resisting layer;

the first protective layer is a foaming piece; the density of the first protective layer is less than or equal to 0.7g/cm ³ ；

A plurality of protection bulges are arranged on the outer wall surface of the second protection layer, are arranged at intervals along the circumferential direction of the second protection layer, and each protection bulge extends along the length direction of the marine towing cable; the circumferential distance between two adjacent protective bulges is larger than the bulge width of the protective bulge;

the wire core unit comprises a grounding unit, and the grounding unit comprises a second wire core, a semiconductive layer and a third protective layer which are sequentially arranged from inside to outside; the material of the semiconductive layer is semiconductive polyolefin, and the material of the third protective layer is polypropylene.

2. The streamer of claim 1, wherein any adjacent two of the core units are spaced apart along the circumference of the streamer, and the load carrying units, the core units, and the first protective layer are spaced apart along the radial direction of the streamer.

3. A marine streamer as claimed in claim 1, wherein the core unit comprises a power supply unit and a data unit for conveying signals.

4. A marine streamer as claimed in claim 3, wherein the core unit comprises a first core, a second water barrier and a wrap, arranged in that order from inside to outside; and the inner side and the outer side of the wrapping layer are fixedly connected with the second water-resisting layer and the first water-resisting layer respectively.

5. The marine streamer of any one of claims 1-4, wherein the plurality of core units further comprises an optical fiber communication unit.