Fire-resistant cable suitable for floating power generation ship in dynamic environment and preparation method of fire-resistant cable

Abstract

The invention relates to the technical field of fire-resistant cables in a dynamic environment, and provides a fire-resistant cable suitable for a floating power generation ship in a dynamic environment, which comprises a cable core and a cable outer protection layer, a plurality of cable cores are arranged in the cable outer protection layer, after the cable cores are arranged in the cable outer protection layer, a filling layer is arranged in gaps among the cable cores, and the filling layer is formed by fixedly filling a plurality of strands of filling ropes in the gaps through a water-blocking material; the filling layer can effectively fill gaps among the cable cores, the multiple strands of filling ropes are fixedly filled in the gaps through the water-blocking material, and the filling ropes in the filling layer can absorb water and expand to fill the gaps, so that the water-blocking performance is further improved, and the service life of the cable is prolonged. Through the structure, the structural stability of the cable can be enhanced, the tensile and bending resistance performance is improved, the fireproof performance of the cable is improved, and the water-blocking, moisture-proof and anti-corrosion performance is enhanced.

Description

Technical Field

[0001] The present disclosure relates to the technical field related to fire-resistant cables in dynamic environments, and in particular to a fire-resistant cable in dynamic environments suitable for floating power generation vessels and a preparation method thereof. Background Art

[0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art.

[0003] As a new solution, liquefied natural gas (LNG) power ships are gradually gaining widespread attention. LNG power ships use natural gas as a clean energy fuel, integrating power generation and transmission functions, which not only effectively reduces carbon emissions, but also has the characteristics of flexible mobility. It can provide reliable power supply for offshore industrial areas, ships moored in ports and small coastal cities, and can even transmit electricity to inland areas through the power grid, showing great application prospects.

[0004] However, the operating environment of LNG power generation ships is extremely special. They usually face complex marine conditions, and ships are often in dynamic and harsh environments such as waves and storms. These external environments place strict requirements on onboard electrical equipment, especially the power transmission system, among which cables are one of the key equipment in power generation ships. Traditional medium-voltage fire-resistant cables are mainly used in land or static environments. Their design concepts do not fully consider the dynamic nature of ships, harsh marine environments, and constantly changing stress conditions. Therefore, they face a variety of technical problems in the special application scenarios of LNG power generation ships. The application of existing medium-voltage fire-resistant cables to LNG power generation ships mainly has the following problems:

[0005] 1) Poor tensile strength: Under the action of ship movement, waves and currents, cables need to withstand periodic tensile and bending loads. However, traditional medium-voltage fire-resistant cables lack sufficient tensile strength. Especially in frequent dynamic environments, the cable fireproof layer (such as fireproof mud) is prone to structural damage, resulting in tensile failure or bending failure of the entire cable, thereby affecting the reliability of power transmission.

[0006] 2) High bending stiffness and insufficient dynamic bending performance: The bending stiffness of traditional medium-voltage fire-resistant cables is relatively high, which results in poor flexibility during installation and use. Especially in power generation vessels where frequent adjustment and bending of cables are required, the dynamic bending performance of traditional cables is insufficient, and the sheath, insulation layer and fireproof layer may fail prematurely due to repeated dynamic stress, shortening the service life of the cable.

[0007] 3) Poor watertightness and corrosion resistance: In marine environments, traditional medium-voltage fire-resistant cables usually do not have sufficient water-blocking properties, and some designs are only suitable for blocking fresh water. The salt and moisture in seawater have a very serious corrosive effect on the metal components and insulation layer of the cable. If the cable lacks effective water-blocking and corrosion-resistant design, the metal components will be oxidized and the insulation layer will gradually degrade, resulting in cable failure. Summary of the invention

[0008] In order to solve the above problems, the present disclosure proposes a fire-resistant cable suitable for use in a floating power generation vessel in a dynamic environment and a preparation method thereof, which can obtain a cable with lighter weight, better flexibility, higher tensile strength, and can be used for a long time in a dynamic environment.

[0009] In order to achieve the above objectives, the present disclosure adopts the following technical solutions:

[0010] One or more embodiments provide a fire-resistant cable suitable for use in a floating power generation vessel in a dynamic environment, comprising a cable core and an outer cable protective layer;

[0011] A plurality of cable cores are arranged in the cable outer protective layer; after the cable cores are arranged in the cable outer protective layer, a filling layer is arranged in the gaps between the cable cores, and the filling layer is fixedly filled in the gaps with a plurality of filling ropes through a water-blocking material.

[0012] The method for preparing the fire-resistant cable suitable for use in a dynamic environment on a floating power generation vessel comprises the following steps:

[0013] Preparing cable cores;

[0014] The prepared cable core is filled with a plurality of water-blocking filling ropes to fill the gap, and fixed by a first wrapping layer, and then the inner sheath is extruded;

[0015] A fire-resistant layer is arranged outside the inner sheath, an even number of armor layers are arranged outside the fire-resistant layer, and a tape layer is arranged on both sides of the armor layer;

[0016] The outer sheath is extruded to finally obtain a cable.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] In the disclosed example, the filling layer can effectively fill the gaps between the cable cores, and multiple filling ropes are fixedly filled in the gaps through water-blocking materials. The filling ropes in the filling layer can absorb water and swell to fill the gaps, thereby further improving the water-blocking performance. This structure can enhance the stability of the cable structure, improve the tensile and bending resistance, improve the fire resistance of the cable, and enhance the water-blocking, moisture-proof and corrosion-resistant performance; and can reduce the overall weight of the cable, absorb vibration and impact, and improve the applicability of the fire-resistant cable in a dynamic environment.

[0019] The advantages of the present disclosure and the advantages of additional aspects will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings constituting a part of the present disclosure are used to provide a further understanding of the present disclosure. The exemplary embodiments of the present disclosure and the description thereof are used to explain the present disclosure but do not constitute a limitation of the present disclosure.

[0021] Figure 1 is a schematic diagram of a cable structure of Embodiment 1 of the present disclosure;

[0022] Figure 2 is a flow chart of a cable preparation method according to Embodiment 2 of the present disclosure;

[0023] Among them, 1. conductor, 2. conductor shielding layer, 3. insulation layer, 4. insulation shielding layer, 5. metal shielding layer, 6. fifth tape layer, 7. conductor sheath, 8. filling layer, 9. first tape layer, 10. inner sheath, 11. fire-resistant layer, 12. second tape layer, 13. first armor layer, 14. third tape layer, 15. second armor layer, 16. fourth tape layer, 17. outer sheath. DETAILED DESCRIPTION

[0024] The present disclosure is further described below in conjunction with the accompanying drawings and embodiments.

[0025] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present disclosure. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present disclosure belongs.

[0026] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present disclosure. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof. It should be noted that, in the absence of conflict, the various embodiments in the present disclosure and the features in the embodiments can be combined with each other. The embodiments will be described in detail below in conjunction with the accompanying drawings.

[0027] Example 1

[0028] In the technical solutions disclosed in one or more embodiments, Figure 1 As shown, a fire-resistant cable suitable for use in a floating power generation vessel in a dynamic environment comprises a cable core and an outer cable protective layer;

[0029] A plurality of cable cores are arranged in the outer protective layer of the cable. After the cable cores are arranged in the outer protective layer of the cable, a filling layer 8 is arranged in the gaps between the cable cores. The filling layer 8 is filled in the gaps with a plurality of filling ropes fixedly filled in the gaps by a water-blocking material.

[0030] In this embodiment, the filling layer 8 can effectively fill the gaps between the cable cores. A plurality of filling ropes are fixedly filled in the gaps through water-blocking materials. The filling ropes in the filling layer 8 can absorb water and swell to fill the gaps, thereby further improving the water-blocking performance. This structure can enhance the stability of the cable structure, improve the tensile and bending resistance, improve the fire resistance of the cable, and enhance the water-blocking, moisture-proof and corrosion-resistant performance; and can reduce the overall weight of the cable, absorb vibration and impact, and improve the applicability of the fire-resistant cable in a dynamic environment.

[0031] The filling layer 8 can enhance the stability of the cable structure. By providing the filling layer 8, the cable cores are prevented from rubbing against each other, shifting or misaligning due to internal gaps in a dynamic environment (such as hull turbulence, swaying, etc.), and the stability of the internal structure of the cable is maintained. In this way, mechanical damage caused by changes in the internal structure can be avoided and the service life of the cable can be extended.

[0032] The setting of the filling layer 8 can improve the tensile and bending resistance. In the dynamic environment of the floating power generation ship, the cable needs to frequently deal with tensile and bending stresses. The filling layer 8 can provide uniform support, effectively reduce the relative movement between the cable cores caused by bending and stretching, help improve the overall tensile resistance of the cable, and enhance the dynamic bending performance of the cable. This enables the cable to withstand frequent hull movements in harsh marine environments and is not prone to mechanical fatigue or breakage.

[0033] The setting of the filling layer 8 can improve the fire resistance of the cable. The combination of multiple-strand filling ropes and water-blocking materials can effectively improve the fire resistance of the cable. The multiple-strand filling ropes themselves have a certain heat insulation effect, and the flame retardant properties of the water-blocking material further enhance the ability of the cable to prevent the spread of flames in a fire. As a barrier, the filling layer 8 can provide additional protection for the cable core in a high temperature environment and ensure the continuity of power transmission.

[0034] The filling layer 8 can enhance the water-blocking, moisture-proof and anti-corrosion properties. Since the filling layer uses a water-blocking material, it can not only effectively prevent the infiltration of water and moisture, but also prevent the corrosion of the cable by seawater, especially in the case of a high salt content in the marine environment. The water-blocking material can prevent the conductor part and the insulation layer from being damp and corroded, prolong the service life of the cable and improve its safety, especially under offshore operating conditions.

[0035] The filling layer 8 of this embodiment can reduce the overall weight of the cable. The multi-strand filling rope as the filling material has a lighter weight and does not significantly increase the weight of the cable compared to traditional filling materials. This is particularly important for marine cables that require high flexibility and easy layout. By using lightweight materials, the cable is more flexible and convenient during installation and operation.

[0036] The filling layer 8 of this embodiment can improve the compression resistance of the cable. By filling the gaps between the conductors in a reasonable manner, the filling layer can disperse the stress under the action of external force and prevent the internal structure of the cable from being damaged due to excessive local force. Such a design can effectively improve the compression resistance of the cable and avoid deformation or damage during installation, use or maintenance.

[0037] The filling layer 8 of this embodiment can absorb vibration and impact. Since the filling rope has certain flexibility and elasticity, when the hull is bumped, vibrated or impacted, the filling layer can absorb and buffer, reduce the impact of external impact on the cable core, further protect the internal stability of the cable, and prevent damage to the cable caused by mechanical stress.

[0038] The filling layer 8 of this embodiment plays a vital role in improving the mechanical properties, fire resistance, waterproof performance and corrosion resistance of the cable through reasonable material selection and structural design, ensuring that the cable can still operate stably in the special dynamic environment of the floating power plant and provide reliable power transmission guarantee.

[0039] According to a further technical solution, the outer protective layer of the cable includes a basic protective layer, an armor layer and an outer sheath 17; the armor layer is set to an even number of layers, the armor layer is spirally wound, and the winding directions of adjacent armor layers are opposite; so as to balance the structural instability caused by the spiral structure;

[0040] Specifically, the armor layer of this embodiment is set to two layers, including a first armor layer 13 and a second armor layer 15, and the first armor layer 13 and the second armor layer 15 are formed by reverse spiral twisting;

[0041] Optionally, the first armor layer 13 is arranged outside the basic protective layer by clockwise spiral twisting, and the second armor layer 15 is arranged outside the first armor layer 13 by counterclockwise spiral twisting; or, the first armor layer 13 is arranged outside the basic protective layer by counterclockwise spiral twisting, and the second armor layer 15 is arranged outside the first armor layer 13 by clockwise spiral twisting;

[0042] A feasible technical solution is that the first armor layer 13 and the second armor layer 15 are arranged by spirally winding carbon fiber braided rope, each braided rope is formed by twisting a number of aramid monofilaments, and the carbon fiber braided rope is made of high temperature resistant material; the high temperature resistant carbon fiber braided rope has a temperature resistance grade of more than 1500°C, and when it is not in contact with air and oxidants, its temperature resistance grade is as high as more than 3000°C, and it has outstanding heat resistance.

[0043] Specifically, the pitch ratio of the spirally wound carbon fiber braided rope of the first armor layer 13 and the second armor layer 15 is set in the range of 14 to 18, the coverage rate is 93.5% to 97.5%, and dense winding is adopted instead of sparse winding;

[0044] In this embodiment, in order to avoid the influence of the torsional stress generated by the spiral twisting of the high-temperature resistant carbon fiber braided rope armor on the torsional balance of the inner layer fire-resistant cable core, the first armor layer 13 and the second armor layer 15 composed of the high-temperature resistant carbon fiber braided rope adopt the first layer and the second layer of armor reverse spiral twisting, eliminate the internal stress generated by the spiral twisting of the single-layer armor, and improve the flexibility of the cable in a dynamic environment;

[0045] Optionally, the number of armor layers can be increased, all using non-metallic materials;

[0046] The above-mentioned armor layer winding method can make the whole fire-resistant cable organically combined into a whole, and improve the utilization rate of the high-temperature resistant carbon fiber braided rope. The equipment used when each high-temperature resistant carbon fiber braided rope is wound for armoring has constant tension control and active back-twisting function, which can effectively ensure the tightness of the high-temperature resistant carbon fiber braided rope during armoring.

[0047] Compared with steel wire, this embodiment uses high temperature resistant carbon fiber braided rope, and the density of high temperature resistant carbon fiber braided rope is only 1.7g / cm 3 , and the density of steel wire is 7.85g / cm 3 The tensile strength of high temperature resistant carbon fiber is 3500Mpa, which is about 10 times that of steel wire. Under the same external tension, the weight of the high temperature resistant carbon fiber braided rope is only 9.2% of the weight of the steel wire, which can reduce the weight of the cable while ensuring the tensile strength. Because the carbon fiber has a higher temperature resistance when it is not exposed to air and oxidants, it can ensure that it has better temperature resistance.

[0048] A further technical solution is to provide a tape layer between the armor layers and outside the armor layers. In this embodiment, two armor layers are provided, a third tape layer 14 is provided between the first armor layer 13 and the second armor layer 15, and a fourth tape layer 16 is provided outside the second armor layer 15;

[0049] Specifically, the overlap rate of the tape layer is not less than 20%;

[0050] Moisture increases the friction of the armor layer and damages the armor layer during dynamic operation. A water-blocking tape (the third tape layer 14 and the fourth tape layer 16) is provided on each armor layer to achieve effective moisture-proofing, thereby improving the wear resistance and the performance of the cable under dynamic conditions.

[0051] In some embodiments, the basic protective layer includes a first tape layer 9, an inner jacket 10, a fire-resistant layer 11, and a second tape layer 12 arranged sequentially from the inside to the outside;

[0052] Optionally, the inner sheath 10 is made of polyurethane material, which has flame retardant and fire resistant properties, and other equivalent materials with the same functions can be used.

[0053] Furthermore, the inner sheath 10 can be extruded by extrusion, and physically has continuous mechanical properties and waterproof properties;

[0054] In one achievable implementation, the fire-resistant layer 11 may be made of ceramic silicone rubber material;

[0055] Ceramic silicone rubber materials can withstand temperatures as high as 1000°C and can be transformed into a ceramic structure at high temperatures, which has heat resistance and fire resistance. Ceramic silicone rubber will not melt under high temperatures, but will be transformed into a hard structure similar to ceramic through a cross-linking reaction. The ceramic layer formed can resist flames, produce less smoke, and does not contain halogens or other toxic components, while maintaining mechanical strength and providing good electrical insulation and heat insulation.

[0056] In some embodiments, the outer sheath 17 may be made of polyurethane material, which has flame retardant and fire resistant properties;

[0057] The outer sheath 17 can be coated on the high temperature resistant carbon fiber braided rope braided layer, i.e., the armor layer, by an extrusion process, and has many properties such as wear resistance, acid and alkali resistance, and high weather resistance. The outer sheath 17 provides a water barrier for the armor layer to prevent seawater erosion.

[0058] In some embodiments, the cable core includes a conductor 1, a conductor shielding layer 2, an insulating layer 3, an insulating shielding layer 4, a metal shielding layer 5, a fifth tape layer 6 and a conductor sheath 7 arranged in sequence from the inside to the outside;

[0059] Optionally, the conductor 1 comprises a plurality of thin conductor monofilaments, the conductor monofilaments are tinned, and the conductor monofilaments are twisted and not compressed;

[0060] Specifically, the conductor monofilament may be a soft conductor material such as a copper monofilament or an aluminum monofilament;

[0061] The conductor 1 of this embodiment comprises a larger number of thin copper monofilaments twisted together, which are not compressed, thus retaining more flexibility. The conductor of this structure is very soft and easy to bend, and is particularly suitable for cables used in dynamic environments. The tinning treatment provides additional anti-oxidation and anti-corrosion protection on the conductor, and also enhances the mechanical properties of the conductor. The tinning itself does not directly affect the softness of the conductor, and the metal conductors are filled with water-blocking materials.

[0062] As a further technical solution, the conductor shielding layer 2, the insulating layer 3 and the insulating shielding layer 4 adopt a three-layer co-extruded structure, which is processed in one step by extrusion molding, thereby improving the stability of the cable.

[0063] Optionally, the conductor shielding layer 2 uses EPDM as the base resin to form a semi-conductive shielding material. If the rubber insulation is directly extruded on the conductor, the depressions, protrusions and irregularities of the conductor will cause local electric field stress concentration and significantly reduce the dielectric strength of the insulation.

[0064] In order to avoid the above situation, when the conductor shielding layer 2 is provided, a layer of semi-conductive shielding material is extruded on the conductor to produce a very smooth dielectric interface on the side facing the insulating layer. Since the semi-conductive shielding layer is very round and has a smooth surface, there will be no electric field stress concentration.

[0065] In a further technical solution, the components of the conductor shielding layer 2 include EPDM rubber, conductive carbon black, antioxidant, organic peroxide, coupling agent, wax, and processing oil;

[0066] The preparation ratio can be: the mass ratio of EPDM rubber, conductive carbon black, antioxidant, organic peroxide, coupling agent, wax, and processing oil is: 100: (55-100): (2-4): (3-4): (1-2): (3-9): (4-20)

[0067] That is: 100 parts of EPDM rubber, 55-100 parts of conductive carbon black, 2-4 parts of antioxidant, 3-4 parts of organic peroxide, 1-2 parts of coupling agent, 3-9 parts of wax, 4-20 parts of processing oil; wherein the weight of each part is equal;

[0068] Optionally, the insulating layer 3 can be made of a high-elastic rubber material. Compared with traditional cross-linked polyethylene, the elastic modulus of cross-linked polyethylene is 235Mpa, and the elastic modulus of the high-elastic rubber material is 16Mpa. The insulation elastic modulus of the high-elastic rubber material is smaller, the flexibility is better, and it is more suitable for dynamic environments. It also has the advantages of oxygen resistance, ozone resistance, water tree resistance, corona resistance, and low radial thermal expansion rate.

[0069] The components and weight proportions of the high elastic rubber material may be: 14-30 EPDM rubber, 12-25 EPDM rubber, 0.5-1.5 zinc stearate, 1.6-2.8 P-60T, 2.3-3.1 zinc oxide, 1.2-2.5 2-mercaptobenzimidazole, 1.3-2.6 polyethylene wax, and 1.3-2.7 triallyl isocyanate.

[0070] Optionally, the insulating shielding layer 4 uses EPDM rubber as a base resin to form a semi-conductive shielding material, which has the same structural components as the conductor shielding layer 2;

[0071] The insulating shielding layer 4 can form a stable dielectric surface, so that the cable is not affected by the external metal shielding layer. The three-layer structure of "conductor shielding-insulation-insulation shielding" constitutes the insulation system of the cable, achieving high-quality insulation.

[0072] In one achievable implementation, the metal shield 5 can be formed by braiding tinned copper wires, which can serve as an electromagnetic shielding layer to reduce the impact of external electromagnetic interference on signal transmission and prevent the internal signal of the cable from interfering with the external environment. A layer of tin is plated on the surface of the copper wire, which can effectively improve the oxidation resistance and corrosion resistance of the copper wire and extend the service life of the cable. The braided structure can increase the flexibility and bending performance of the cable, making the cable more durable and less prone to damage due to frequent bending.

[0073] It is feasible that the fifth wrapping layer 6, the first wrapping layer 9, the second wrapping layer 12, the third wrapping layer 14 and the fourth wrapping layer 16 can be made of highly flexible flame-retardant, heat-resistant and fire-resistant glass fiber cloth coated tape, which has moderate thickness, good softness, a tensile strength of more than 300N / 25mm, an oxygen index ≥55%, and can withstand high temperatures up to 600°C.

[0074] Furthermore, the conductor sheath 7 may be made of a highly elastic rubber material with a smaller elastic modulus, better compliance, and is more suitable for dynamic environments, and has the advantages of being resistant to oxygen, ozone, water trees, corona, and having a low radial thermal expansion rate.

[0075] The cable core of the present embodiment adopts copper wire braided shielding to form a metal shield 5, the cable core and multiple strands of waterproof filling ropes are cabled, and the tape layer adopts highly flexible flame-retardant, heat-resistant and fire-resistant glass fiber cloth coating tape; spirally wound even-numbered layers of high-temperature resistant carbon fiber braided ropes are adopted between the sheath layers, and each braided rope is twisted by a number of aramid monofilaments to provide sufficient tensile strength for the cable body and bear axial tension, and adjacent layers of high-temperature resistant carbon fiber braided ropes are wound in opposite directions to balance the structural instability caused by the spiral structure; the sheath adopts flame-retardant and fire-resistant polyurethane material, and is coated on the outside of the braided layer of high-temperature resistant carbon fiber braided rope through an extrusion process, and has many properties such as wear resistance, acid and alkali resistance, high weather resistance, and protection against seawater erosion. The obtained fire-resistant cable for floating power generation vessels in dynamic environments has good flexibility, high bearing capacity, strong fatigue resistance, and excellent water tightness and corrosion resistance.

[0076] Compared with the existing traditional fire-resistant cables, the fire-resistant cable for floating power generation vessels in dynamic environments of this embodiment adopts ceramicized silicone rubber or other equivalent materials in the fire-resistant layer 11. Compared with fire-proof mud, it is not easy to fall off and has good dynamic flexibility, and can withstand temperatures up to 1000°C or above. When it is transformed into a ceramic structure at high temperature, it provides excellent heat resistance and fire resistance. Compared with steel wire armor, the non-metallic armor layer used is lighter, more flexible, has higher tensile strength and longer service life. In addition to TPU polyurethane, the sheath material can also be TPE elastic material, vulcanized rubber or other equivalent materials, which play the role of salt spray protection, waterproof and UV protection. By improving the sheath material and adding the armor layer, the flexibility and tensile strength of the fire-resistant cable are greatly increased, the tensile strength is increased by 430%, and the working life in the dynamic environment of floating power generation vessels is increased by 50%.

[0077] Example 2

[0078] Based on Example 1, this embodiment provides a method for preparing a fire-resistant cable suitable for use in a dynamic environment of a floating power generation vessel as described in Example 1, comprising the following steps:

[0079] Step 1, preparing a cable core;

[0080] Step 11, preparation of conductor 1, selecting a soft conductor for wire drawing, tinning the single wire and twisting it into a conductor bundle through a twisting process;

[0081] Specifically, copper monofilaments or other soft conductor materials (such as aluminum monofilaments) of appropriate diameter and quantity are selected and tinned to enhance the anti-oxidation and anti-corrosion capabilities of the conductors.

[0082] The conductor monofilaments are twisted into conductor bundles through a stranding process and are not compressed to maintain the flexibility of the conductor.

[0083] Step 12: After the conductor 1 is completed, it is passed through an insulation extrusion device to simultaneously extrude the conductor shielding layer, the insulation layer and the insulation shielding layer through a single extrusion process, thereby improving the insulation performance and production efficiency of the cable;

[0084] Step 13, arranging a metal shielding layer 5, a fifth tape layer 6 and an extruded sheath 7 outside the insulating shielding layer 4;

[0085] Specifically, a metal shielding layer 5 is provided outside the insulating shielding layer 4, and a metal braided shield is adopted, which is formed by braiding tinned copper wires, and provides an electromagnetic shielding function to reduce the influence of external electromagnetic interference on the cable signal transmission, and increase the tensile strength and durability of the cable;

[0086] Step 3, the prepared cable core is passed through a cabling device, and a plurality of water-blocking ropes are used to fill the gaps, and the first wrapping layer 9 is used to wrap and fix the cable core, and then an inner sheath 10 is extruded;

[0087] Specifically, the cabling equipment, i.e. the cabling machine, has a constant tension control and an automatic back-twisting device to ensure that the cable core and the water-blocking rope are tightly rounded after being cabled without residual stress, thereby ensuring the reliability of the cable and extending its service life. The filling rope of the filling layer 8 can absorb water and swell, further enhancing the water-blocking performance of the cable, while providing structural support, ensuring that the cable has good roundness, and improving the tensile strength and flexibility of the cable.

[0088] Step 4: A fire-resistant layer 11 is extruded outside the inner sheath 10. The fire-resistant layer 11 is mainly composed of ceramic silicone rubber or other equivalent materials, which can withstand temperatures as high as 1000°C and can be transformed into a ceramic structure at high temperatures, thereby providing excellent heat resistance and fire resistance.

[0089] Step 5, an even number of armor layers are arranged outside the fire-resistant layer 11, and tape layers are arranged on both sides of the armor layers;

[0090] The armoring machine is equipped with a constant tension control system, which can ensure that the tension of the armor rope remains constant during the armoring process, achieve refined control, avoid uneven cable surface or damage caused by uneven tension, and thus improve the overall quality of the cable. The armoring enhances the overall mechanical strength, tensile strength and corrosion resistance of the cable through the tight wrapping of the tape, meeting the requirements of harsh dynamic environments.

[0091] Furthermore, the armor layers are fixed by spiral winding, and during the winding process, the winding directions of adjacent armor layers are opposite;

[0092] In this embodiment, a high temperature resistant carbon fiber braided rope is used as the armor material, which is divided into a first armor layer 13 and a second armor layer 15, and is arranged in a spiral twisting manner in opposite directions to balance the internal stress caused by the spiral twisting and improve the flexibility and fatigue resistance of the cable.

[0093] Carbon fiber braided rope is made of twisted aramid monofilaments. It has high temperature resistance and high tensile strength, providing strong mechanical protection for cables in dynamic environments.

[0094] A third tape layer 14 is provided between the first armor layer 13 and the second armor layer 15 to protect the armor layer from corrosion by moisture and salt spray, enhance the wear resistance, and prevent damage to the armor layer in a dynamic working environment.

[0095] Specifically, the tape layer is made of highly flexible flame-retardant, heat-resistant and fire-resistant glass fiber cloth coated tape to ensure that the tape has high temperature tolerance and tensile strength, while also having excellent waterproof and moisture-proof properties.

[0096] Step 6: Perform sheath extrusion processing, and extrude the outer sheath 17 to obtain a cable;

[0097] The polyurethane material is used to form an outer sheath by extrusion process on the outside of the armor layer, providing a protective layer for the entire cable.

[0098] Polyurethane materials are wear-resistant, acid-resistant, alkali-resistant, and weather-resistant. They can effectively resist salt spray, ultraviolet rays, and mechanical damage in the marine environment. They also have flame retardant and waterproof properties.

[0099] Furthermore, performance testing is carried out: the completed cables are subjected to strict performance testing, including tensile strength test, bending resistance test, fire resistance test, water tightness test and corrosion resistance test;

[0100] The testing ensures that the cables can meet the requirements of use in the dynamic environment of floating power generation vessels and have a long service life and high reliability.

[0101] The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. For those skilled in the art, the present disclosure may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

[0102] Although the above describes the specific implementation methods of the present disclosure in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present disclosure. Technical personnel in the relevant field should understand that on the basis of the technical solution of the present disclosure, various modifications or variations that can be made by those skilled in the art without creative work are still within the scope of protection of the present disclosure.

Claims

1. Fire-resistant cables suitable for use in dynamic environments on floating power generation vessels, characterized by: Including cable core and cable outer protective layer; Multiple cable cores are arranged inside the outer protective layer of the cable; After the cable core is arranged in the outer protective layer of the cable, a filling layer is arranged in the gap between the cable cores. The filling layer adopts a plurality of filling ropes fixedly filled in the gap through a water-blocking material.

2. The fire-resistant cable suitable for use in a dynamic environment on a floating power generation vessel according to claim 1, characterized in that: The outer protective layer of the cable includes a basic protective layer, an armor layer and an outer sheath; the armor layer is set to an even number of layers, the armor layer is spirally wound, and the winding directions of adjacent armor layers are opposite.

3. The fire-resistant cable suitable for use in a dynamic environment on a floating power generation vessel as claimed in claim 2, characterized in that: The armor layer is formed by spirally winding carbon fiber braided rope, and each braided rope is formed by twisting a number of aramid monofilaments.

4. The fire-resistant cable suitable for use in a dynamic environment on a floating power generation vessel as claimed in claim 3, characterized in that: The pitch ratio of the helically wound carbon fiber braided rope of the armor layer is set to 14-18.

5. The fire-resistant cable suitable for use in a dynamic environment on a floating power generation vessel as claimed in claim 2, characterized in that: Tape layers are arranged between the armor layers and outside the armor layers.

6. The fire-resistant cable suitable for use in a dynamic environment on a floating power generation vessel as claimed in claim 2, characterized in that: The basic protective layer comprises a first tape layer, an inner jacket, a fire-resistant layer and a second tape layer which are arranged in sequence from the inside to the outside.

7. The fire-resistant cable suitable for use in a dynamic environment on a floating power generation vessel as claimed in claim 6, characterized in that: The fire-resistant layer is made of ceramic silicone rubber material; Alternatively, the inner sheath is made of polyurethane material and is extruded by extrusion.

8. The fire-resistant cable suitable for use in a dynamic environment on a floating power generation vessel as claimed in claim 2, characterized in that: The cable core includes a conductor, a conductor shielding layer, an insulating layer, an insulating shielding layer, a metal shielding layer, a fifth tape layer and a conductor sheath which are arranged in sequence from the inside to the outside; The conductor comprises a plurality of thin conductor single wires, the conductor single wires are tinned, and the conductor single wires are twisted and not compressed.

9. The fire-resistant cable suitable for use in a dynamic environment on a floating power generation vessel as claimed in claim 8, characterized in that: The conductor shielding layer, the insulating layer and the insulating shielding layer 4 adopt a three-layer co-extruded structure.

10. The method for preparing a fire-resistant cable suitable for use in a dynamic environment on a floating power generation vessel according to any one of claims 1 to 9, characterized in that: The steps include: Preparing cable cores; The prepared cable core is filled with a plurality of water-blocking filling ropes to fill the gap, and fixed by a first wrapping layer, and then the inner sheath is extruded; A fire-resistant layer is arranged outside the inner sheath, an even number of armor layers are arranged outside the fire-resistant layer, and a tape layer is arranged on both sides of the armor layer; The outer sheath is extruded to finally obtain a cable.

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