A lightweight marine dynamic cable
By adopting lightweight design and real-time monitoring technology, the problems of traditional marine dynamic cables, such as large weight, insufficient mechanical strength, and poor waterproof performance, have been solved, enabling the cable to operate efficiently and reliably in deep water environments and meeting the needs of clean energy transmission.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NINGBO QRUNNING CABLE CO LTD
- Filing Date
- 2025-08-13
- Publication Date
- 2026-07-03
AI Technical Summary
Traditional marine dynamic cables are heavy, expensive, and lack mechanical strength due to the high density of their lead sheaths, making them unsuitable for the complex requirements of deep-water environments. They also have insufficient waterproof performance, affecting long-term reliability.
The cable adopts a tightly round copper conductor, a composite shielding water-blocking structure, a double-layer reverse spiral stainless steel wire armor layer and an aluminum-plastic composite tape layer to replace the lead sheath, and combines it with an optical fiber monitoring unit to enhance mechanical strength and waterproof performance, and monitor the cable status in real time.
It significantly reduces cable weight by 30-40%, increases reel length by 20%, enhances omnidirectional water-blocking function, ensures long-term stability and reliability of cables in complex marine environments, enables real-time monitoring to detect problems promptly, and reduces transportation and laying costs.
Smart Images
Figure CN224457702U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of marine cable technology, specifically relating to a lightweight marine dynamic cable. Background Technology
[0002] With the increasing global demand for clean energy, offshore wind power is rapidly developing as an important source of renewable energy. To meet the growing demand for electricity transmission, offshore wind farms are gradually expanding from shallow waters to deep-sea areas, prompting the development of floating wind power facilities. In these facilities, dynamic cables are used to transmit electricity and signals from the sea surface to the seabed and must be able to withstand various dynamic loads in the complex marine environment, such as movements caused by waves, tides, and wind.
[0003] Traditional marine dynamic cable designs typically employ a lead sheath as the primary radial waterproof layer. The lead sheath is wrapped around the insulation layer through a continuous extrusion process, forming an effective metallic seal barrier to prevent seawater penetration and provide necessary mechanical protection. However, the high density of lead alloys (11.3 g / cm³) significantly increases the overall weight of the cable, leading to high costs and increased complexity in manufacturing, transportation (requiring heavy-duty cable reels), and laying (requiring specialized vessels). Furthermore, lead alloys are soft and prone to denting when subjected to bending or impact, affecting the long-term reliability of the cable. Utility Model Content
[0004] The technical problem to be solved by this utility model is to provide a lightweight marine dynamic cable in light of the current state of the technology.
[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a lightweight marine dynamic cable is proposed, comprising, from the inside to the outside, the following components are arranged sequentially:
[0006] The conductor layer is made of tightly rounded copper conductors;
[0007] An insulating layer is formed by covering the outside of the conductor layer.
[0008] The composite shielding and water-blocking structure includes a metal shielding layer composed of a loosely wound copper wire layer and a wrapped copper strip layer, a water-blocking strip layer covering the outer surface of the metal shielding layer, and an aluminum-plastic composite strip layer longitudinally wrapped around the outside of the water-blocking strip layer, wherein the aluminum-plastic composite strip layer forms a sheath layer for the conductor layer and the insulating layer.
[0009] Filler material, used to fill the gaps between cable cores to buffer bending stress;
[0010] The armor layer is composed of two layers of stainless steel wires arranged in a reverse spiral.
[0011] An outer sheath layer covers the outside of the armor layer.
[0012] In the aforementioned lightweight marine dynamic cable, the composite shielded water-blocking structure includes water-blocking strips on both the inner and outer sides of the metal shielding layer.
[0013] In the aforementioned lightweight marine dynamic cable, the longitudinal joints of the aluminum-plastic composite tape layer are bonded and fixed with hot melt adhesive.
[0014] In the aforementioned lightweight marine dynamic cable, the conductor gaps in the conductor layer are filled with nano-aerogel water-blocking material.
[0015] In the aforementioned lightweight marine dynamic cable, the stainless steel wire diameter of the armor layer is 5-10 mm.
[0016] The aforementioned lightweight marine dynamic cable also includes an optical fiber monitoring unit disposed in the cable core, the optical fiber monitoring unit comprising at least two core optical cables.
[0017] In the aforementioned lightweight marine dynamic cable, the outer layer of the fiber optic monitoring unit is covered with a polyethylene sheath.
[0018] The aforementioned lightweight marine dynamic cable includes at least two composite units consisting of the conductor layer, the insulation layer, and the composite shielding water-blocking structure, wherein the at least two composite units are arranged in a concentric spiral twisted arrangement.
[0019] In the aforementioned lightweight marine dynamic cable, the stainless steel wire surface of the armor layer is plated with a zinc-nickel alloy coating.
[0020] In the aforementioned lightweight marine dynamic cable, the outer sheath layer comprises an inner layer and an outer layer nested within each other, the inner layer being made of polypropylene material.
[0021] Compared with the prior art, the present invention has the following beneficial effects:
[0022] (1) The aluminum-plastic composite tape layer replaces the traditional lead sheath, which not only significantly reduces the overall weight of the cable by 30-40%, but also increases the reel length by about 20%. This means that in practical applications, such as connecting floating wind turbines to submarine power grids in offshore wind farms, transportation and laying costs are greatly reduced, and installation is more convenient.
[0023] (2) Water-blocking strips are provided on both the inner and outer sides of the metal shielding layer. This improvement greatly enhances the omnidirectional water-blocking function of the cable, effectively prevents water intrusion, and ensures the long-term stability and reliability of the cable in complex marine environments.
[0024] (3) By setting up an optical fiber monitoring unit in the cable core, which contains at least two core optical cables, strain and temperature anomalies can be monitored in real time, which helps to detect and deal with potential problems in a timely manner and ensure the safe operation of the cable. Attached Figure Description
[0025] Figure 1 This is a cross-sectional view of a lightweight marine dynamic cable according to this utility model.
[0026] In the diagram, 100 is the conductor layer; 200 is the insulation layer; 300 is the composite shielding water-blocking structure; 310 is the metal shielding layer; 320 is the water-blocking tape layer; 330 is the aluminum-plastic composite tape layer; 400 is the filling material; 500 is the armor layer; 600 is the outer sheath layer; 610 is the inner layer; 620 is the outer layer; and 700 is the fiber optic monitoring unit. Detailed Implementation
[0027] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.
[0028] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.
[0029] With the growing global demand for clean energy, offshore wind power is rapidly expanding as an important source of renewable energy. To meet the increasing demand for power transmission, offshore wind farms are gradually developing from shallow waters to deep seas, which has promoted the popularization of floating wind power facilities. However, traditional lead-sheathed cables, due to their high density (11.3 g / cm³), suffer from problems such as heavy weight and insufficient mechanical strength, making them unsuitable for the complex requirements of deep-water environments. Therefore, this paper proposes a lightweight marine dynamic cable solution.
[0030] Reference Figure 1 The lightweight marine dynamic cable of this solution includes, from the inside out, a conductor layer 100, an insulation layer 200, a composite shielding and water-blocking structure 300, a filling material 400, an armor layer 500, and an outer sheath layer 600.
[0031] Specifically, the conductor layer 100 is made of tightly round copper conductors; the insulation layer 200 covers the outside of the conductor layer 100; the composite shielding water-blocking structure 300 includes a metal shielding layer 310 composed of a loosely wound copper wire layer and a wrapped copper tape layer, a water-blocking tape layer 320 covering the outer surface of the metal shielding layer 310, and an aluminum-plastic composite tape layer 330 longitudinally wrapped around the outside of the water-blocking tape layer 320, wherein the aluminum-plastic composite tape layer 330 forms the sheath layer of the conductor layer 100 and the insulation layer 200; the filling material 400 fills the gaps in the cable core to buffer bending stress; the armor layer 500 is made of double-layered stainless steel wires arranged in a reverse spiral; and the outer sheath layer 600 covers the outside of the armor layer 500.
[0032] The aluminum-plastic composite tape layer 330 replaces the traditional lead sheath. This design not only significantly reduces the overall weight of the cable by 30-40%, but also increases the reel length by approximately 20%. This means that in practical applications, such as connecting floating wind turbines to submarine power grids in offshore wind farms, transportation and laying costs are greatly reduced, and installation is much simpler. Furthermore, the use of the aluminum-plastic composite tape enhances the cable's corrosion resistance, making it more suitable for long-term exposure to marine environments.
[0033] Furthermore, in the composite shielding water-blocking structure 300, water-blocking strips 320 are provided on both the inner and outer sides of the metal shielding layer 310. This improvement greatly enhances the omnidirectional water-blocking function of the cable, effectively preventing moisture intrusion and ensuring the long-term stability and reliability of the cable in complex marine environments. This enhanced waterproofing performance is particularly important in offshore oil and gas platform applications, as it ensures the continuous operation of the power transmission system and prevents system failures caused by moisture infiltration.
[0034] The longitudinal joints of the 330mm aluminum-plastic composite tape layer are fixed with hot melt adhesive. This treatment ensures excellent sealing, further enhancing the cable's waterproof performance and corrosion resistance, and extending its service life. This design is particularly crucial for seabed observation systems that require long-term stable operation. It guarantees the stability of data transmission, providing a reliable communication link for scientific research.
[0035] The conductor gaps in conductor layer 100 are filled with nano-aerogel water-blocking material (pore size <10nm), which offers superior water-blocking performance compared to traditional water-blocking powders or tapes, significantly improving the cable's durability and protection level. This design enables the cable to maintain high efficiency in extreme environments and is suitable for various harsh marine conditions. For example, in sea areas facing strong winds and waves, the cable can still maintain its electrical performance, ensuring stable power and signal transmission.
[0036] The armor layer 500 uses double-layered, counter-spiraled stainless steel wires with a diameter of 5-10mm, providing a tensile strength exceeding 1500MPa. This high-strength armor layer 500 gives the cable greater mechanical strength and resistance to bending fatigue, enabling it to withstand the combined effects of large bending moments, shear, and torques in dynamic marine environments. It is particularly suitable for power transmission in deep-water areas, ensuring system stability. In practical applications, such as connecting long-distance offshore wind farms, this design ensures long-term stable operation of the cable even in complex marine environments.
[0037] In addition, it includes an optical fiber monitoring unit 700 embedded in the cable core. Preferably, this unit comprises at least two 48-core optical fibers to monitor strain and temperature anomalies in real time. This helps to promptly detect and address potential problems, ensuring the safe operation of the cable. Simultaneously, the outer layer of the optical fiber unit is made of polyethylene sheath material, effectively eliminating the potential difference between the optical fiber unit and the metal shielding layer 310 and armor layer 500, improving overall electrical safety. This is particularly useful for submarine facilities requiring continuous monitoring, such as data transmission lines of submarine observation stations, enabling real-time monitoring of the cable's status.
[0038] The outer layer of the fiber optic monitoring unit 700 is covered with the same polyethylene material as the cable's outer sheath. This not only protects the optical fiber from external environmental influences but also simplifies the manufacturing process through standardized material selection, reducing production costs and enhancing the overall consistency and durability of the cable. This allows the cable to perform exceptionally well in various application scenarios. Whether facing the challenges of offshore wind farms or offshore oil and gas platforms, this new type of cable demonstrates superior performance, meeting the needs of future clean energy transmission. Through these innovative designs, we have not only solved the problems inherent in traditional cables but also significantly improved the cable's efficient and reliable operation capabilities in complex marine environments.
[0039] It is worth mentioning that the cable of this solution includes at least two composite units composed of the conductor layer 100, the insulation layer 200 and the composite shielding water-blocking structure 300, and the at least two composite units are arranged in a concentric circle twisted arrangement.
[0040] By arranging multiple composite units (each unit comprising a conductor layer 100, an insulation layer 200, and a composite shielding water-blocking structure 300) in a concentric spiral configuration, the overall mechanical strength of the cable is enhanced, as is its flexibility. This design allows the cable to better withstand bending and torsional stresses in complex and dynamic marine environments, ensuring structural integrity and electrical performance during long-term use. Particularly in deep-sea environments, this design helps improve the cable's fatigue resistance and extend its service life.
[0041] Preferably, the stainless steel wire of the armor layer 500 is plated with a zinc-nickel alloy coating.
[0042] The zinc-nickel alloy-plated stainless steel wire armor layer 500 provides superior corrosion resistance and mechanical strength. Compared to traditional galvanized steel wire, the zinc-nickel alloy coating offers higher corrosion resistance, especially in high-salinity marine environments, effectively preventing corrosion of internal metal components of the cable. Furthermore, the zinc-nickel alloy coating enhances the abrasion resistance and tensile strength of the stainless steel wire, thereby improving the durability and reliability of the entire cable system and ensuring long-term stable operation of the cable in harsh marine environments.
[0043] The outer sheath layer 600 includes an inner layer 610 and an outer layer 620 nested together. The inner layer 610 is made of polypropylene material, and the outer layer 620 is a hot-melt asphalt layer incorporating carbon black.
[0044] The outer sheath 600 employs a double-layer design. The outer layer 620 is a hot-melt asphalt layer incorporating carbon black, while the inner layer 610 is made of polypropylene. This design combines the advantages of both materials, utilizing the excellent sealing and waterproofing properties of the hot-melt asphalt layer while leveraging the superior chemical resistance and mechanical strength of polypropylene. The addition of carbon black further enhances the UV resistance and weather resistance of the hot-melt asphalt layer, enabling it to maintain its performance over extended periods in extreme environments. The polypropylene outer layer 620 provides additional protection against seawater salinity, chloride ion corrosion, and biofouling, ensuring long-term reliable operation of the cable in complex marine environments.
[0045] The cable disclosed in this solution significantly improves the overall performance of lightweight marine dynamic cables. For example, in offshore wind farms, this cable can efficiently connect floating wind turbines to the subsea power grid, ensuring stable power and signal transmission even under strong winds and waves. For offshore oil and gas platforms, this cable provides reliable power and data transmission, ensuring the platform's continuous operation. In seabed observation systems, real-time monitoring ensures transparency of the cable's status, enabling timely detection and handling of potential problems, and guaranteeing the system's safety and stability.
[0046] Through the aforementioned improvements, this solution not only solves the problems of heavy weight, insufficient mechanical strength, and poor waterproof performance of traditional cables, but also significantly enhances the cable's efficient and reliable operation in complex marine environments, meeting the needs of future clean energy transmission. Every technical detail has been carefully considered to ensure that the entire cable system can operate stably and efficiently in any environment.
[0047] It should be noted that in this invention, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. The terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly specified. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0048] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.
[0049] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.
Claims
1. A lightweight marine dynamic cable, characterized by Including the following, arranged sequentially from the inside out: The conductor layer is made of tightly rounded copper conductors; An insulating layer is formed by covering the outside of the conductor layer. The composite shielding and water-blocking structure includes a metal shielding layer composed of a loosely wound copper wire layer and a wrapped copper strip layer, a water-blocking strip layer covering the outer surface of the metal shielding layer, and an aluminum-plastic composite strip layer longitudinally wrapped around the outside of the water-blocking strip layer, wherein the aluminum-plastic composite strip layer forms a sheath layer for the conductor layer and the insulating layer. Filler material, used to fill the gaps between cable cores to buffer bending stress; The armor layer is composed of two layers of stainless steel wires arranged in a reverse spiral. An outer sheath layer covers the outside of the armor layer.
2. The lightweight marine dynamic cable of claim 1, wherein, In the composite shielding and water-blocking structure, water-blocking strips are provided on both the inner and outer sides of the metal shielding layer.
3. The lightweight marine dynamic cable according to claim 1, characterized in that, The longitudinal joints of the aluminum-plastic composite strip are fixed by hot melt adhesive.
4. The lightweight marine dynamic cable according to claim 1, characterized in that, The conductor gaps in the conductor layer are filled with nano-aerogel water-blocking material.
5. The lightweight marine dynamic cable according to claim 1, characterized in that, The stainless steel wire in the armor layer has a diameter of 5-10 mm.
6. The lightweight marine dynamic cable according to claim 1, characterized in that, It also includes an optical fiber monitoring unit disposed in the cable core, the optical fiber monitoring unit comprising at least two core optical cables.
7. The lightweight marine dynamic cable according to claim 6, characterized in that, The outer layer of the fiber optic monitoring unit is covered with a polyethylene sheath.
8. The lightweight marine dynamic cable according to claim 1, characterized in that, It includes at least two composite units consisting of the conductor layer, the insulation layer and the composite shielding water-blocking structure, and the at least two composite units are arranged in a concentric spiral twisted arrangement.
9. The lightweight marine dynamic cable according to claim 1, characterized in that, The stainless steel wire of the armor layer is plated with a zinc-nickel alloy coating.
10. The lightweight marine dynamic cable according to claim 1, characterized in that, The outer sheath layer comprises an inner layer and an outer layer nested within each other, the inner layer being made of polypropylene material.