Overcurrent early warning type marine power cable

Abstract

The utility model discloses an over-current early warning type marine power cable, which comprises a cable core formed by twisting three power line cores, a grounding line core, an over-current early warning line core and a nylon resin filling core strip together, and the over-current early warning line core comprises a line core body formed by twisting two early warning lines in pairs. A PET resin wrapping layer, an irradiation crosslinking low-density polyethylene inner extruded wrapping layer, an ETFE resin cushion layer and an irradiation crosslinking low-density polyethylene outer extruded wrapping layer are sequentially wrapped outside the wire core body, and the early warning wire comprises a tin-phosphor bronze monofilament conductor and a polyethylene insulating layer. The cable core is sequentially coated with a nylon tape wrapping layer, a butyl rubber water-blocking pressure-reducing layer, an anti-impact plain woven net armor layer and a silane grafted cross-linked high-density polyethylene outer sheath. The cable has an over-current early warning function, so that fire accidents of the marine cable are prevented in the bud, the safety and reliability of the cable are enhanced, and the cable is durable in use.

Description

Technical Field

[0001] This application belongs to the technical field of cables, and in particular relates to an over-current warning type marine power cable. Background Art

[0002] Marine cables include marine power cables, marine control cables, and marine communication cables, which are mainly used for power supply, lighting, and general control of various ships in rivers and seas, as well as offshore oil platforms and other marine structures. With the rapid development of river and ocean transportation industries and marine engineering, the number of various ships and offshore oil platforms will also continue to increase, and the technical requirements for cables by various equipment are increasing day by day. Shipbuilding units and users have special requirements for the performance of marine cables, and ordinary power cables cannot be directly substituted. Due to the relatively harsh operating environment, when the current is too large on the ship, the cable catching fire will trigger a larger fire accident. If countermeasures can be taken in time before the cable fire accident occurs to prevent the cable fire accident, it is necessary to improve the safety performance of the cable. Summary of the Utility Model

[0003] Aiming at the deficiencies of the prior art, the technical problem to be solved by this application is to provide an over-current warning type marine power cable with an over-current warning function, which can prevent the occurrence of cable fire accidents on ships, is beneficial to enhancing the safety and reliability of the cable, and can be used durably.

[0004] The above technical problems are solved by the following technical solutions in this application.

[0005] The over-current warning type marine power cable includes three power cores, one grounding core, one over-current warning core, and one nylon resin filling core strip that are jointly stranded to form a cable core. The power core includes an aluminum alloy conductor, an EVA water-blocking adhesive layer, and a low-smoke and flame-retardant composite insulation layer. The low-smoke and flame-retardant composite insulation layer includes a polyester non-woven fabric layer, an aromatic polyimide isolation layer, and an XLPE insulation layer from the inside to the outside in sequence. The over-current warning core includes two warning pairs that are twisted to form a core body. The outside of the core body is sequentially coated with a PET resin wrapping layer, an irradiated cross-linked low-density polyethylene inner extrusion layer, an ETFE resin cushion layer, and an irradiated cross-linked low-density polyethylene outer extrusion layer. The warning wire includes a tin phosphor bronze single wire conductor and a polyethylene insulation layer. The outside of the cable core is sequentially coated with a nylon tape wrapping layer, a butyl rubber water-blocking and pressure-reducing layer, an impact-resistant flat woven wire armor layer, and a silane-grafted cross-linked high-density polyethylene outer sheath.

[0006] Preferably, the aluminum alloy conductor is formed by stranding and compacting a number of aluminum alloy wires with a diameter of 0.15 mm to 0.32 mm to form a circular conductor structure.

[0007] Preferably, the thickness of the EVA water-blocking adhesive layer is 3 μm to 8 μm.

[0008] Preferably, the low-smoke and flame-retardant composite insulating layer is 0.5 mm to 2 mm.

[0009] Preferably, the thickness of the polyester non-woven fabric layer is 0.05 mm to 0.08 mm, the thickness of the aromatic polyimide isolation layer is 0.02 mm to 0.04 mm, and the thickness of the XLPE insulating layer is not less than 0.45 mm.

[0010] Preferably, the outer diameter of the tin-phosphor bronze single-wire conductor is 0.5 mm to 1 mm.

[0011] Preferably, the thickness of the polyethylene insulating layer is 0.1 mm to 0.3 mm.

[0012] Preferably, the impact-resistant plain woven mesh armor layer includes an inner layer of tinned copper wire plain woven mesh and an outer layer of tinned copper wire plain woven mesh. The inner layer of tinned copper wire plain woven mesh is formed by weaving fine tinned copper wires into a plain woven mesh structure, and the outer layer of tinned copper wire plain woven mesh is formed by weaving thick tinned copper wires into a plain woven mesh structure. The wire diameter of the thick tinned copper wire is 5 to 20 times that of the fine tinned copper wire.

[0013] Preferably, the weaving density of the inner layer of tinned copper wire plain woven mesh is greater than that of the outer layer of tinned copper wire plain woven mesh.

[0014] Preferably, the butyl rubber water-blocking and pressure-reducing layer is a multi-layer overlapping winding structure of butyl rubber tapes, and the overlapping rate of the butyl rubber tapes is one-fourth to one-half of the width of the butyl rubber tape.

[0015] Advantages of the present application:

[0016] 1. By adding an overcurrent warning core in the cable core, since the melting point of the polyethylene insulating layer of an overcurrent warning core is lower than the melting point of the low-smoke and flame-retardant composite insulating layer of the power supply core, when overcurrent occurs, the polyethylene insulating layer of the overcurrent warning core melts first, causing the two tin-phosphor bronze single-wire conductors to come into direct contact and short-circuit. By monitoring the short circuit of the overcurrent warning core, an early warning function can be achieved. Before the power supply core melts and catches fire, on-site personnel can take safety measures in time, preventing cable fire accidents in advance, providing a strong guarantee for the safe use of the cable, enhancing the safety and reliability of the cable, and improving the durability and applicability.

[0017] 2. By adding a nylon resin filling core strip and twisting it together with three power supply cores, one ground wire core, and one overcurrent warning core, the cable core structure is balanced into a circular cross-section, which helps to improve the mechanical strength, is beneficial to withstanding the lateral pressure during bending, ensures the safe and reliable electrical characteristics of the cable, and improves the durability of use.

[0018] 3. The power cable core adopts a low-smoke and flame-retardant composite insulation layer with a three-layer integrated structure. When the cable catches fire and burns, during the full combustion process of the polyester non-woven fabric layer, the aromatic polyimide isolation layer has the function of isolating the smoke. The aromatic polyimide isolation layer has high-temperature resistance and flame-retardant properties, and can prevent the combustion smoke from escaping from the inside of the cable, realizing a low-smoke type fire-resistant power cable with excellent performance. It meets the green environmental protection design of the cable, does not contain harmful substances to human health, does not release smoke or toxic gases in the burning flame, and the discarded cable can be fully recycled and reused, without pollution to the environment and can be recycled and processed. Brief Description of the Drawings

[0019] Figure 1 It is a schematic cross-sectional structure diagram of an embodiment of the present application.

[0020] Description of the Reference Numerals:

[0021] 1 - power cable core, 2 - grounding wire core, 3 - overcurrent warning wire core, 4 - nylon resin filling core bar, 5 - aluminum alloy conductor, 6 - EVA water-blocking adhesive layer, 7 - low-smoke and flame-retardant composite insulation layer, 8 - warning wire, 9 - PET resin wrapping layer, 10 - irradiated cross-linked low-density polyethylene inner extrusion layer, 11 - ETFE resin cushion layer, 12 - irradiated cross-linked low-density polyethylene outer extrusion layer, 13 - tin phosphor bronze single-wire conductor, 14 - polyethylene insulation layer, 15 - nylon tape wrapping layer, 16 - butyl rubber water-blocking and pressure-reducing layer, 17 - impact-resistant flat woven mesh armor layer, 18 - silane-grafted cross-linked high-density polyethylene outer sheath. Detailed Embodiments

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions of the present application will be clearly and completely described below with reference to the drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without making creative efforts shall fall within the scope of protection of the present application.

[0023] See Figure 1, the overcurrent warning type marine power cable of the embodiment of the present application includes three power line cores 1, one grounding line core 2, one overcurrent warning line core 3 and one nylon resin filling core strip 4 which are jointly stranded to form a cable core. The power line core 1 includes an aluminum alloy conductor 5, an EVA water blocking adhesive layer 6 and a low-smoke and difficult-to-combust composite insulation layer 7. Specifically, the aluminum alloy conductor 5 is formed by stranding and compacting a plurality of aluminum alloy wires with a diameter of 0.15 mm to 0.32 mm into a circular conductor structure. The thickness of the EVA water blocking adhesive layer 6 is 3 μm to 8 μm. The low-smoke and difficult-to-combust composite insulation layer 7 sequentially includes a polyester non-woven fabric layer, an aromatic polyimide isolation layer and an XLPE insulation layer from the inside to the outside. The thickness of the low-smoke and difficult-to-combust composite insulation layer 7 is 0.5 mm to 2 mm. Further, the thickness of the polyester non-woven fabric layer is 0.05 mm to 0.08 mm, the thickness of the aromatic polyimide isolation layer is 0.02 mm to 0.04 mm, and the thickness of the XLPE insulation layer is not less than 0.45 mm. The overcurrent warning line core 3 includes two warning lines 8 which are twisted to form a core body. The outside of the core body is sequentially coated with a PET resin wrapping layer 9, an irradiated cross-linked low-density polyethylene inner extrusion coating layer 10, an ETFE resin cushion layer 11 and an irradiated cross-linked low-density polyethylene outer extrusion coating layer 12. The warning line 8 includes a tin phosphor bronze single wire conductor 13 and a polyethylene insulation layer 14. Specifically, the outer diameter of the tin phosphor bronze single wire conductor 13 is 0.5 mm to 1 mm. The thickness of the polyethylene insulation layer 14 is 0.1 mm to 0.3 mm.

[0024] The outside of the cable core is sequentially coated with a nylon tape wrapping layer 15, a butyl rubber water blocking and pressure reducing layer 16, an impact-resistant flat woven mesh armor layer 17 and a silane-grafted cross-linked high-density polyethylene outer sheath 18. In one embodiment, the butyl rubber water blocking and pressure reducing layer 16 is a multi-layer overlapping wrapping structure of butyl rubber tapes, and the overlapping rate of the butyl rubber tapes is one-fourth to one-half of the width of the butyl rubber tape. In one embodiment, the impact-resistant flat woven mesh armor layer 17 includes an inner layer of tinned copper wire flat woven mesh and an outer layer of tinned copper wire flat woven mesh. The inner layer of tinned copper wire flat woven mesh is formed by weaving fine tinned copper wires into a flat woven mesh structure. The outer layer of tinned copper wire flat woven mesh is formed by weaving thick tinned copper wires into a flat woven mesh structure. The wire diameter of the thick tinned copper wire is 5 to 20 times that of the fine tinned copper wire. Further, the weaving density of the inner layer of tinned copper wire flat woven mesh is greater than that of the outer layer of tinned copper wire flat woven mesh.

[0025] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also intended to include these changes and modifications.

Claims

1. The overcurrent warning type marine power cable is characterized in that: It includes three power line cores (1), one ground wire core (2), one overcurrent warning wire core (3) and one nylon resin filling core strip (4) which are jointly stranded to form a cable core. The power line core (1) includes an aluminum alloy conductor (5), an EVA water-blocking adhesive layer (6) and a low-smoke and difficult-to-combust composite insulation layer (7). The low-smoke and difficult-to-combust composite insulation layer (7) sequentially includes a polyester non-woven fabric layer, an aromatic polyimide isolation layer and an XLPE insulation layer from inside to outside. The overcurrent warning wire core (3) includes two warning wires (8) which are twisted to form a core body. The outside of the core body is sequentially coated with a PET resin wrapping layer (9), an irradiated cross-linked low-density polyethylene inner extrusion coating layer (10), an ETFE resin cushion layer (11) and an irradiated cross-linked low-density polyethylene outer extrusion coating layer (12). The warning wire (8) includes a tin phosphor bronze single-wire conductor (13) and a polyethylene insulation layer (14). The outside of the cable core is sequentially coated with a nylon tape wrapping layer (15), a butyl rubber water-blocking and pressure-reducing layer (16), an impact-resistant flat woven wire armor layer (17) and a silane-grafted cross-linked high-density polyethylene outer sheath (18).

2. The overcurrent warning type marine power cable according to claim 1, characterized in that: The aluminum alloy conductor (5) is formed by stranding and compacting a number of aluminum alloy wires with a diameter of 0.15 mm to 0.32 mm into a circular conductor structure.

3. The overcurrent warning type marine power cable according to claim 1, characterized in that: The thickness of the EVA water-blocking adhesive layer (6) is 3 μm to 8 μm.

4. The overcurrent warning type marine power cable according to claim 1, characterized in that: The low-smoke and difficult-to-combust composite insulation layer (7) is 0.5 mm to 2 mm.

5. The overcurrent warning type marine power cable according to claim 1, characterized in that: The thickness of the polyester non-woven fabric layer is 0.05 mm to 0.08 mm, the thickness of the aromatic polyimide isolation layer is 0.02 mm to 0.04 mm, and the thickness of the XLPE insulation layer is not less than 0.45 mm.

6. The overcurrent warning type marine power cable according to claim 1, characterized in that: The outer diameter of the tin phosphor bronze single-wire conductor (13) is 0.5 mm to 1 mm.

7. The overcurrent warning type marine power cable according to claim 1, characterized in that: The thickness of the polyethylene insulation layer (14) is 0.1 mm to 0.3 mm.

8. The overcurrent warning type marine power cable according to claim 1, characterized in that: The impact-resistant flat woven wire armor layer (17) includes an inner layer of tinned copper wire flat woven net and an outer layer of tinned copper wire flat woven net. The inner layer of tinned copper wire flat woven net is formed by weaving fine tinned copper wires into a flat woven net structure. The outer layer of tinned copper wire flat woven net is formed by weaving thick tinned copper wires into a flat woven net structure. The wire diameter of the thick tinned copper wire is 5 to 20 times that of the fine tinned copper wire.

9. The overcurrent warning type marine power cable according to claim 8, wherein: The weaving density of the inner layer of tinned copper wire flat woven net is greater than that of the outer layer of tinned copper wire flat woven net.

10. The overcurrent warning type marine power cable according to claim 1, characterized in that: The butyl rubber water-blocking and pressure-reducing layer (16) is a multi-layer overlapping wrapping structure of butyl rubber tapes, and the overlapping rate of the butyl rubber tapes is one-fourth to one-half of the width of the butyl rubber tape.

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