A longitudinally water-blocking, wear-resistant, and low-temperature resistant demagnetizing cable for ships

Abstract

This utility model discloses a longitudinally water-blocking, wear-resistant, and low-temperature resistant demagnetizing cable for ships, comprising a cable core including multiple conductors arranged in an externally tangential manner. From the inside out, a longitudinally water-blocking layer, an inner sheath, an armor layer, a wrapping layer, and an outer sheath are sequentially arranged on the outside of the cable core. A filler layer is provided between the multiple conductors inside the longitudinally water-blocking layer. By improving its structure, the demagnetizing cable of this utility model not only enhances the cable's longitudinal water-blocking, wear-resistant, and low-temperature resistance performance but also achieves stable demagnetizing performance, thus meeting the usage requirements of ship demagnetizing systems under harsh operating conditions. It features a simple overall structure, stable performance, and a reasonable design.

Description

Technical Field

[0001] This utility model relates to the field of ship cable technology, specifically a longitudinal water-blocking, wear-resistant, and low-temperature resistant demagnetizing cable for ships. Background Technology

[0002] Ship degaussing systems are crucial for ensuring safe navigation. They connect various components via degaussing cables to neutralize the ship's magnetic field, preventing detection by magnetic mines or enemy magnetic detection equipment. Because ship degaussing cables operate in the marine environment for extended periods, they face numerous stringent conditions: high humidity makes them highly susceptible to seawater infiltration, and low temperatures (such as polar or high-latitude seas where winter temperatures can drop below -60°C) can cause the cable material to become brittle. Furthermore, the cables rub against ship structural components and marine life, leading to mechanical wear. All of these factors place high demands on the cables' longitudinal water resistance, abrasion resistance, low-temperature resistance, and degaussing stability.

[0003] The main problems with existing ship demagnetization cables are as follows: Firstly, longitudinal water resistance relies on the sheath's own sealing properties; if there is localized damage, seawater can easily seep in longitudinally and corrode the internal structure. Secondly, the outer sheath is mostly made of ordinary neoprene rubber or polyethylene, which has a high abrasion resistance coefficient (≥0.5) and is prone to wear and cracking after long-term use; Third, insulation and sheathing materials are prone to embrittlement at temperatures below -40℃, and cracks may appear when bent, leading to insulation failure. Fourth, most metal shielding layers have a single structure, which makes their shielding effectiveness greatly affected by temperature and humidity, with demagnetization accuracy fluctuating by about 15dB.

[0004] Therefore, in order to address the problems existing in the current ship demagnetizing cables and meet the normal use requirements of ship cables, it is urgent to design a ship demagnetizing cable with optimized structure to solve the above-mentioned performance defects. It is essential to provide a ship demagnetizing cable that not only has longitudinal water-blocking properties but also wear resistance and low-temperature resistance. Utility Model Content

[0005] The technical problem to be solved by this utility model is to address the problems existing in the background technology, thereby providing a ship demagnetizing cable with a simple structure and convenient use. By using this ship demagnetizing cable, through the collaborative design of a multi-layer structure, the longitudinal water-blocking, wear-resistant, low-temperature resistance and demagnetizing stability of the cable can be improved, thereby meeting the usage requirements of ship demagnetizing systems under harsh working conditions. Specifically, it is a longitudinal water-blocking, wear-resistant and low-temperature resistant ship demagnetizing cable.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: a longitudinal water-blocking, wear-resistant, and low-temperature resistant demagnetizing cable for ships, comprising a cable core, wherein the cable core comprises multiple conductors arranged in an externally tangent state, and a longitudinal water-blocking layer, an inner sheath, an armor layer, a wrapping layer, and an outer sheath are sequentially provided on the outside of the cable core from the inside to the outside, while a filling layer is provided between the multiple conductors inside the longitudinal water-blocking layer.

[0007] Furthermore, the longitudinal water-blocking, wear-resistant, and low-temperature resistant demagnetizing cable for ships described in this utility model has three conductors arranged in an externally tangent state to form the cable core. Each conductor includes a tin-plated copper core, a conductor shielding layer disposed outside the tin-plated copper core, and an insulation layer disposed outside the conductor shielding layer. An insulating shielding layer is disposed outside the insulation layer, and a metal shielding layer is disposed outside the insulating shielding layer.

[0008] Furthermore, in the longitudinal water-blocking, wear-resistant, and low-temperature resistant demagnetizing cable for ships described in this utility model, the tin-plated copper core is made by stranding multiple strands of tin-plated copper wire with a single wire diameter of 0.1 to 0.3 mm, and the stranding pitch ratio is 12 to 16 times the single wire diameter; while the conductor shielding layer is made by extruding semi-conductive cross-linked polyethylene material, and its thickness is 0.8 to 1.2 mm.

[0009] Furthermore, in the longitudinal water-blocking, wear-resistant, and low-temperature resistant demagnetizing cable for ships described in this utility model, the insulation layer is extruded from low-temperature resistant cross-linked polyethylene material with butyl rubber added as a modifier, and its thickness is 2.0-3.0 mm; the insulating shielding layer is extruded from semi-conductive non-cross-linked polyethylene material, and its thickness is 0.6-1.0 mm; the metal shielding layer is a composite structure layer made of copper tape wrapped around and galvanized steel wire braided, and the braiding density of the galvanized steel wire is ≥90%.

[0010] Furthermore, in the longitudinal water-blocking, wear-resistant, and low-temperature resistant demagnetizing cable for ships described in this utility model, the longitudinal water-blocking layer is formed by wrapping semi-conductive water-resistant tape and water-blocking yarn, and the overlap rate of the semi-conductive water-resistant tape is ≥25%, while the water-blocking yarn fills the wrapping gap of the semi-conductive water-resistant tape.

[0011] Furthermore, in the longitudinal water-blocking, wear-resistant, and low-temperature resistant demagnetizing cable for ships described in this utility model, the inner sheath is extruded from modified chlorinated polyethylene material, and its extrusion thickness is 1.5 to 2.0 mm.

[0012] Furthermore, in the longitudinal water-blocking, wear-resistant, and low-temperature resistant demagnetizing cable for ships described in this utility model, the armor layer is made of galvanized steel wire with a diameter of 0.8 to 1.2 mm.

[0013] Furthermore, in the longitudinal water-blocking, wear-resistant, and low-temperature resistant demagnetizing cable for ships described in this utility model, the wrapping layer is made of water-blocking tape, and a layer of waterproof gel is coated on the surface of the wrapping layer.

[0014] Furthermore, in the longitudinal water-blocking, wear-resistant, and low-temperature resistant demagnetizing cable for ships described in this utility model, the outer sheath is extruded from modified polyurethane material, and its extrusion thickness is 2.0 to 3.0 mm.

[0015] Furthermore, in the longitudinal water-blocking, wear-resistant, and low-temperature resistant demagnetizing cable for ships described in this utility model, the filling layer is filled in the gaps between the multiple conductors within the longitudinal water-blocking layer using water-blocking filling ropes or water-blocking filling strips.

[0016] The longitudinally water-blocking, wear-resistant, and low-temperature resistant demagnetizing cable for ships described in this utility model has the following advantages compared to existing technologies: Because the cable core is provided with a longitudinally water-blocking layer, an inner sheath, an armor layer, a wrapping layer, and an outer sheath sequentially from the inside to the outside, and a filling layer is provided between multiple conductors inside the longitudinally water-blocking layer, each conductor includes a tin-plated copper core, a conductor shielding layer disposed outside the tin-plated copper core, and an insulation layer disposed outside the conductor shielding layer. An insulating shielding layer is disposed outside the insulating shielding layer, and a metal shielding layer is disposed outside the insulating shielding layer. Through the coordinated design of each layer structure, the cable manufactured using this method possesses the following advantages: First, it has excellent longitudinal water-blocking performance: the composite longitudinal water-blocking layer structure composed of semi-conductive water-blocking tape and water-blocking yarn can form a double water-blocking barrier with a longitudinal water-blocking rate of ≤0.1mL / min, which can effectively prevent seawater from penetrating along the longitudinal direction of the cable and avoid internal structural corrosion. Secondly, it has outstanding wear resistance: the outer sheath is made of polyurethane material modified with nano-silica and dioctyl phthalate, with a wear resistance coefficient as low as 0.3 and a wear amount ≤0.5mm after wear resistance test, thus extending the service life of the cable; Third, it has stable low-temperature performance: the insulation layer is modified with butyl rubber and the outer sheath is made of modified polyurethane material. It still has good flexibility at a temperature of -60℃, and there are no cracks when bending, which ensures the insulation performance and structural integrity in low-temperature environments. Fourth, the demagnetization effect is stable: the metal shielding layer adopts a composite structure of copper strip wrapping and galvanized steel wire weaving, with a magnetic field shielding efficiency of ≥85dB, and a small fluctuation range in a wide temperature and high humidity environment, ensuring the stable operation of the demagnetization system. Fifth, it has strong comprehensive adaptability: its overall structure has excellent mechanical strength, corrosion resistance and weather resistance, and is suitable for degaussing systems of various ships such as destroyers, frigates, submarines and polar research vessels, especially suitable for harsh sea conditions such as high latitudes and polar regions.

[0017] Therefore, by improving the structure of the demagnetizing cable described in this utility model, not only can the longitudinal water resistance, wear resistance, and low-temperature resistance of the cable be improved, but also the demagnetizing stability can be achieved, thereby meeting the usage requirements of ship demagnetizing systems under harsh working conditions. It has a simple overall structure, stable performance, and reasonable design, and is worthy of promotion and use. Attached Figure Description

[0018] The present invention will now be described in further detail with reference to the accompanying drawings.

[0019] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the conductor described in this utility model.

[0020] As shown in the figure: 1-Conductor, 11-Tin-plated copper core, 12-Conductor shielding layer, 13-Insulation layer, 14-Insulation shielding layer, 15-Metallic shielding layer, 2-Longitudinal water-blocking layer, 3-Inner sheath, 4-Armor layer, 5-Wrapping tape layer, 6-Outer sheath, 7-Filling layer. Detailed Implementation

[0021] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0022] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding. They are not intended to limit the scope of this invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of this invention, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms "upper," "lower," "left," and "right" used in this specification are merely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connection" and "provided with" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] It should be noted that the term "comprising" or any other variation is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0025] like Figure 1 and Figure 2 As shown, this embodiment provides a longitudinal water-blocking, wear-resistant, and low-temperature resistant demagnetizing cable for ships, including a cable core. The cable core includes three conductors 1, which are arranged in an outward tangent to form the cable core. On the outside of the cable core, from the inside to the outside, there are a longitudinal water-blocking layer 2, an inner sheath 3, an armor layer 4, a wrapping layer 5, and an outer sheath 6. A filling layer 7 is provided between the multiple conductors 1 inside the longitudinal water-blocking layer 2.

[0026] Furthermore, in the longitudinal water-blocking, wear-resistant, and low-temperature resistant demagnetizing cable for ships provided in this embodiment, the longitudinal water-blocking layer 2 is formed by wrapping semi-conductive water-resistant tape and water-blocking yarn, with the overlap rate of the semi-conductive water-resistant tape being ≥25%, and the water-blocking yarn filling the wrapping gaps of the semi-conductive water-resistant tape. The inner sheath 3 is extruded from modified chlorinated polyethylene material, with an extrusion thickness of 1.5–2.0 mm. The armor layer 4 is armored from galvanized steel wire with a wire diameter of 0.8–1.2 mm. The wrapping layer 5 is formed by wrapping with water-blocking tape, and a layer of waterproof gel is coated on the surface of the wrapping layer 5. The outer sheath 6 is extruded from modified polyurethane material, with an extrusion thickness of 2.0–3.0 mm. The filling layer 7 is filled in the gaps between the multiple conductors 1 within the longitudinal water-blocking layer 2 using water-blocking filling rope or water-blocking filling strip.

[0027] In the actual manufacturing process, a longitudinal water-blocking, wear-resistant, and low-temperature resistant demagnetizing cable for ships provided in this embodiment is used. Each conductor 1 includes a tin-plated copper core 11, a conductor shielding layer 12 disposed outside the tin-plated copper core 11, and an insulation layer 13 disposed outside the conductor shielding layer 12. An insulation shielding layer 14 is disposed outside the insulation layer 13, and a metal shielding layer 15 is disposed outside the insulation shielding layer 14. The tin-plated copper core 11 is formed by stranding multiple strands of tin-plated copper wire with a diameter of 0.1–0.3 mm, and the stranding pitch ratio is 12–16 times the diameter of the single wire. The conductor shielding layer 12 is extruded from semi-conductive cross-linked polyethylene material, and its thickness is 0.8–1.2 mm. The insulation layer 13 is extruded from low-temperature resistant cross-linked polyethylene material with butyl rubber added as a modifier, and its thickness is 2.0–3.0 mm. The insulating shielding layer 14 is extruded from semi-conductive non-cross-linked polyethylene material, and its thickness is 0.6–1.0 mm. The metal shielding layer 15 is a composite structure layer made of copper strip wrapped with galvanized steel wire, and the braiding density of the galvanized steel wire is ≥90%.

[0028] The longitudinal water-blocking, wear-resistant, and low-temperature resistant demagnetizing cable for ships provided in this embodiment is briefly described below to facilitate understanding of the function and role of each layer of the structure: The tin-plated copper core 11 in the conductor 1 is made of multiple strands of tin-plated copper wires twisted together. The diameter of a single tin-plated copper wire is 0.1 to 0.3 mm, and the twisting pitch ratio is 12 to 16 times the diameter of a single wire. The tin plating layer can improve the corrosion resistance of the copper wire, while its twisting structure can ensure the flexibility of the conductor, making it convenient for cable wiring inside ships.

[0029] The conductor shielding layer 12 is a semi-conductive cross-linked polyethylene layer, tightly covering the outside of the conductor. Its extrusion thickness is 0.8–1.2 mm, and its volume resistivity is ≤1×10⁻⁶ at a temperature of 20°C. 3 Ω.cm, which can distribute the electric field evenly and avoid insulation damage caused by the concentration of electric field on the conductor surface.

[0030] The insulating layer 13 is extruded from low-temperature resistant cross-linked polyethylene material with butyl rubber added as a modifier. The amount of butyl rubber added is 5-8% of the mass of the cross-linked polyethylene matrix, and the extrusion thickness is 2.0-3.0 mm. Under the condition of 20℃, the breakdown field strength is ≥25kV / mm, and under the condition of 20℃, its dielectric phase angle (abbreviated as dielectric loss angle) tangent is ≤0.005. The addition of butyl rubber can improve the low-temperature flexibility of cross-linked polyethylene and avoid the insulation layer from becoming brittle and cracking under low-temperature conditions.

[0031] The insulating shielding layer 14 is a semi-conductive non-crosslinked polyethylene layer, which will cover the outside of the insulating layer. Its extrusion thickness is 0.6-1.0 mm, and its volume resistivity is ≤5×10⁻⁶ at a temperature of 20℃. 3 The peel strength of the insulating layer 13 is ≥1.5 N / mm, which can further homogenize the electric field and also achieve an effective transition between the insulating layer 13 and the metal shielding layer 15.

[0032] The metal shielding layer 15 is a composite structure of copper tape wrapping and galvanized steel wire braiding. The copper tape is wrapped around the outside of the insulating shielding layer 14 with a pitch ratio of 8 to 10, while the galvanized steel wire is woven around the outside of the copper tape with a braiding density of ≥90%. The copper tape can achieve basic magnetic field shielding, and the galvanized steel wire braiding not only enhances the shielding effectiveness but also improves the mechanical strength of the cable. At the same time, the galvanized layer can improve the corrosion resistance of the steel wire.

[0033] The longitudinal water-blocking layer 2 is composed of a semi-conductive water-blocking tape and water-blocking yarn. The semi-conductive water-blocking tape is wrapped around the outside of the metal shielding layer with an overlap rate of ≥25%. The water-blocking yarn is filled in the wrapping gaps of the semi-conductive water-blocking tape at a density of 5-8 yarns / mm. The semi-conductive water-blocking tape can block most of the water. The water-blocking yarn will expand when it comes into contact with water and fill the gaps to form a double longitudinal water-blocking barrier, which can effectively prevent seawater from penetrating longitudinally along the cable.

[0034] The inner sheath 3 is extruded from modified chlorinated polyethylene material. The modified chlorinated polyethylene material is a mixture of chlorinated polyethylene with added antioxidant 1010 and ultraviolet absorber UV-531. The amount of antioxidant 1010 added is 0.5-1.0% of the mass of the chlorinated polyethylene matrix, and the amount of ultraviolet absorber UV-531 added is 0.3-0.5%. The extrusion thickness is 1.5-2.0 mm. Because its tensile strength is ≥18MPa and its elongation at break is ≥200%, and chlorinated polyethylene has good corrosion resistance, the antioxidant and ultraviolet absorber can delay the aging of the inner sheath and extend the service life of the cable.

[0035] The armor layer 4 is a galvanized steel wire armor structure with a wire diameter of 0.8 to 1.2 mm and an armor pitch ratio of 10 to 14 times the wire diameter. After armoring, the cable has a lateral pressure resistance of ≥10 kN / m, which can effectively protect the internal structure of the cable from external mechanical impact and improve the cable's lateral pressure resistance.

[0036] The outer sheath 6 is extruded from a modified polyurethane material. The modified polyurethane material is a mixture of nano-silica and dioctyl phthalate. The amount of nano-silica added is 3-5% of the mass of the polyurethane matrix, and the amount of dioctyl phthalate added is 8-12%. Nano-silica can improve the wear resistance of polyurethane, and dioctyl phthalate can improve the low-temperature flexibility of polyurethane. This allows the outer sheath 6 to have excellent wear resistance (wear amount ≤0.5mm after wear test) and to bend without cracking at a temperature of -60℃.

[0037] The wrapping layer 5 is formed by wrapping with water-blocking tape, and a layer of waterproof gel is coated on the surface of the wrapping layer 5; while the filling layer 7 is formed by filling the gaps between the multiple conductors 1 within the longitudinal water-blocking layer 2 with water-blocking filling rope or water-blocking filling strip. By using the wrapping layer 5 and the filling layer 7, its waterproof performance can be further improved.

[0038] For the above extrusion process: select the appropriate temperature according to the material properties, and use the existing conventional process method of extrusion to ensure that the layer is dense and seamless, and completely isolates the external chemical media and moisture.

[0039] In summary, the demagnetizing cable described in this utility model, through structural improvements, not only enhances the cable's longitudinal water resistance, wear resistance, and low-temperature resistance, but also achieves stable demagnetizing performance, thereby meeting the usage requirements of ship demagnetizing systems under harsh working conditions. It features a simple overall structure, stable performance, and reasonable design, making it worthy of widespread application.

[0040] Other aspects of this utility model that are not detailed herein are all conventional techniques known to those skilled in the art.

[0041] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Various modifications and variations can be made by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. made using the present utility model should be included within the protection scope of the present utility model.

Claims

1. A longitudinal water-resistant, wear-resistant, low-temperature-resistant, de-magnetic marine cable, comprising a cable core, said cable core comprising a plurality of conductors (1), characterized in that: Multiple conductors (1) are arranged in an outward tangent state. From the inside to the outside of the cable core, a longitudinal water-blocking layer (2), an inner sheath (3), an armor layer (4), a wrapping layer (5), and an outer sheath (6) are provided. A filling layer (7) is provided between the multiple conductors (1) inside the longitudinal water-blocking layer (2).

2. A longitudinal water resistant, abrasion resistant, low temperature resistant, de-magnetic marine cable as claimed in claim 1, wherein: The conductor (1) has three strands, which are arranged in an externally tangent state to form a cable core. Each conductor (1) includes a tin-plated copper core (11), a conductor shielding layer (12) disposed outside the tin-plated copper core (11), and an insulation layer (13) disposed outside the conductor shielding layer (12). An insulation shielding layer (14) is disposed outside the insulation layer (13), and a metal shielding layer (15) is disposed outside the insulation shielding layer (14).

3. The longitudinal water-blocking, wear-resistant, and low-temperature resistant demagnetizing cable for ships according to claim 2, characterized in that: The tin-plated copper core (11) is made by twisting together multiple strands of tin-plated copper wire with a diameter of 0.1 to 0.3 mm, and the twisting pitch ratio is 12 to 16 times the diameter of the single wire; while the conductor shielding layer (12) is made by extruding semi-conductive cross-linked polyethylene material, and its thickness is 0.8 to 1.2 mm.

4. The longitudinal water-blocking, wear-resistant, and low-temperature resistant demagnetizing cable for ships according to claim 2, characterized in that: The insulating layer (13) is extruded from low-temperature cross-linked polyethylene material with butyl rubber as a modifier, and its thickness is 2.0 to 3.0 mm; the insulating shielding layer (14) is extruded from semi-conductive non-cross-linked polyethylene material, and its thickness is 0.6 to 1.0 mm; the metal shielding layer (15) is a composite structure layer made of copper strip wrapped with galvanized steel wire, and the braiding density of the galvanized steel wire is ≥90%.

5. The longitudinal water-blocking, wear-resistant, and low-temperature resistant demagnetizing cable for ships according to claim 1, characterized in that: The longitudinal water-blocking layer (2) is formed by wrapping semi-conductive water-blocking tape and water-blocking yarn, and the overlap rate of the semi-conductive water-blocking tape is ≥25%, while the water-blocking yarn fills the wrapping gap of the semi-conductive water-blocking tape.

6. The longitudinal water-blocking, wear-resistant, and low-temperature resistant demagnetizing cable for ships according to claim 1, characterized in that: The inner sheath (3) is made of modified chlorinated polyethylene material by extrusion, and its extrusion thickness is 1.5 to 2.0 mm.

7. The longitudinal water-blocking, wear-resistant, and low-temperature resistant demagnetizing cable for ships according to claim 1, characterized in that: The armor layer (4) is made of galvanized steel wire with a diameter of 0.8 to 1.2 mm.

8. The longitudinal water-blocking, wear-resistant, and low-temperature resistant demagnetizing cable for ships according to claim 1, characterized in that: The wrapping layer (5) is made by wrapping with water-blocking tape, and a layer of waterproof gel is coated on the surface of the wrapping layer (5).

9. The longitudinal water-blocking, wear-resistant, and low-temperature resistant demagnetizing cable for ships according to claim 1, characterized in that: The outer sheath (6) is made of modified polyurethane material by extrusion, and its extrusion thickness is 2.0 to 3.0 mm.

10. A longitudinally water-blocking, wear-resistant, and low-temperature resistant demagnetizing cable for ships according to claim 1, characterized in that: The filling layer (7) is filled in the gaps between the multiple conductors (1) in the longitudinal water-blocking layer (2) by water-blocking filling rope or water-blocking filling strip.

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