Marine explosion-proof cable

Abstract

This utility model discloses a marine explosion-proof cable, relating to the field of explosion-proof cable technology. The explosion-proof cable comprises a core conductor, an inner insulation layer, an outer sheath, a gap-filling layer, a metal tubular shielding layer, flame-retardant wrapping tape, an inner shielding layer, and an outer insulation layer. The inner insulation layer encloses the core conductor, and the outer insulation layer encloses all the inner insulation layers. The inner shielding layer is wrapped around the outside of the outer insulation layer, the flame-retardant wrapping tape is wrapped around the outside of the inner shielding layer, the metal tubular shielding layer is wrapped around the outside of the flame-retardant wrapping tape, and the outer sheath is fitted over the metal tubular shielding layer. The gap-filling layer fills the space between the outer sheath and the metal tubular shielding layer. This utility model, through its core conductor, inner insulation layer, outer sheath, gap-filling layer, metal tubular shielding layer, flame-retardant wrapping tape, inner shielding layer, and outer insulation layer, can greatly improve the explosion-proof performance of the explosion-proof cable, preventing internal explosions and flames from forming within the cable.

Description

Technical Field

[0001] This utility model relates to the field of explosion-proof cable technology, specifically to a marine explosion-proof cable. Background Technology

[0002] Marine explosion-proof cables are cables with explosion-proof properties specially designed for the special environments of ships (such as merchant ships, fishing boats, research vessels, warships, etc.). Their core function is to transmit electricity or signals in flammable and explosive risk areas of ships (such as fuel tanks, engine rooms, paint rooms, chemical storage areas, etc.), while preventing sparks or high temperatures caused by their own faults (such as short circuits, overloads, insulation damage), thereby avoiding the ignition of surrounding flammable gases, vapors or dust and ensuring the safety of ship navigation.

[0003] Chinese Patent Publication No. CN219457222U discloses an intrinsically safe explosion-proof marine cable, which includes a cable body, an outer sheath, and multiple core groups installed inside the outer sheath. An outer shielding layer is installed on the inner wall of the outer sheath to insulate and shield the outer sheath and the multiple core groups. The outer shielding layer contains aluminum-plastic composite tape and braided shielding. Each core group includes a core sheath and conductors. Multiple conductors are located inside the core sheath. A core shielding layer is provided on the inner wall of the core sheath, and an insulation layer is provided on the outer side of the conductors. An aluminum-plastic composite tape and a drain wire are provided inside the core shielding layer. This utility model meets the electrical requirements for use in marine environments with high explosion hazards.

[0004] However, the explosion-proof cables disclosed in the aforementioned patents still have certain shortcomings in practical applications. Existing marine explosion-proof cables mostly use a single metal braided shielding layer, and their explosion-proof principle is mainly to eliminate static electricity and electromagnetic interference through shielding and grounding. However, in extreme cases (such as internal short circuits generating high-temperature arcs), the single shielding layer may be melted through, failing to effectively prevent the spread of explosion flames and high-temperature gases within the cable channel. Utility Model Content

[0005] The purpose of this invention is to provide a marine explosion-proof cable to solve the problem mentioned in the background art that in extreme cases (such as when an internal short circuit generates a high-temperature arc), the single shielding layer of the existing explosion-proof cable may be melted through, making it unable to effectively block the spread of explosion flames and high-temperature gases in the cable channel.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a marine explosion-proof cable, comprising an explosion-proof cable, the explosion-proof cable including a core conductor, an inner insulation layer, an outer sheath, a gap filling layer, a metal tubular shielding layer, a flame-retardant wrapping tape, an inner shielding layer, and an outer insulation layer. The inner insulation layer wraps the core conductor inside it, the outer insulation layer wraps all the inner insulation layers inside it, the inner shielding layer is wrapped around the outside of the outer insulation layer, the flame-retardant wrapping tape is wrapped around the outside of the inner shielding layer, the metal tubular shielding layer is wrapped around the outside of the flame-retardant wrapping tape, the outer sheath is fitted over the outside of the metal tubular shielding layer, and the gap filling layer fills the space between the outer sheath and the metal tubular shielding layer.

[0007] Preferably, the core conductor is made of tin-plated copper wire.

[0008] Preferably, the inner insulation layer and the outer insulation layer are made of cross-linked polyethylene and ethylene propylene rubber, respectively.

[0009] Preferably, the inner shielding layer is a thin copper strip and adopts a longitudinally wrapped overlapping structure.

[0010] Preferably, the flame-retardant tape is made of ceramicized silicone rubber tape material.

[0011] Preferably, the metal tubular shielding layer is made of aluminum tubing, the gap filling layer is made of flame-retardant intumescent material, and the outer sheath is made of halogen-free, low-smoke, flame-retardant polyolefin material.

[0012] Compared with the prior art, the beneficial effects of this utility model are: This invention improves the corrosion resistance of the explosion-proof cable by incorporating a core conductor made of tin-plated copper wire, thus extending its service life. The excellent insulation properties of cross-linked polyethylene and ethylene propylene rubber, respectively, ensure that the electrical performance of the explosion-proof cable remains unaffected. An inner shielding layer using a thin copper tape longitudinal wrapping structure eliminates uneven internal electric fields within the explosion-proof cable. A flame-retardant wrapping tape made of ceramicized silicone rubber forms a hard, ceramic-like heat-insulating layer upon contact with fire, providing a flame-retardant effect. An aluminum tube serves as the core explosion-proof layer, a metal tubular shielding layer, which acts as a physical barrier. Even in the event of an internal explosion, the robust metal tube completely encloses the flames, arcs, and high-pressure gases, preventing their propagation. A gap-filling layer is constructed by filling the space between the metal tubular shielding layer and the outer sheath with a flame-retardant intumescent material (such as a rubber mixture containing aluminum hydroxide). Upon exposure to high temperatures, this material rapidly expands, blocking all gaps, further suffocating the flame and providing heat insulation. The outer sheath, made of halogen-free, low-smoke, flame-retardant polyolefin, ensures flame retardancy, oil resistance, and weather resistance under normal conditions. Attached Figure Description

[0013] Figure 1 This is a first-view structural schematic diagram of a marine explosion-proof cable according to the present invention; Figure 2 This is a second-view structural schematic diagram of a marine explosion-proof cable according to the present invention; Figure 3 This utility model Figure 2 Enlarged structural diagram at point A; Figure 4 This is a structural schematic diagram of a marine explosion-proof cable according to the present invention.

[0014] In the diagram: 1. Explosion-proof cable; 101. Core conductor; 102. Inner insulation layer; 103. Outer sheath; 104. Gap filling layer; 105. Metal tubular shielding layer; 106. Flame-retardant wrapping tape; 107. Inner shielding layer; 108. Outer insulation layer. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4This utility model provides a technical solution: a marine explosion-proof cable, including an explosion-proof cable 1. The explosion-proof cable 1 comprises a core conductor 101, an inner insulation layer 102, an outer sheath 103, a gap filling layer 104, a metal tubular shielding layer 105, a flame-retardant wrapping tape 106, an inner shielding layer 107, and an outer insulation layer 108. The inner insulation layer 102 wraps the core conductor 101 inside. The inner insulation layer 102 and the outer insulation layer 108 are made of cross-linked polyethylene and ethylene propylene rubber, respectively. Relying on the excellent insulation properties of cross-linked polyethylene and ethylene propylene rubber, the electrical performance of the explosion-proof cable 1 is ensured to be unaffected. The core conductor 101 uses tin-plated copper wire to improve the corrosion resistance of the explosion-proof cable 1. The outer insulation layer 108 encloses all the inner insulation layers 102 within it. The inner shielding layer 107 is wrapped around the outside of the outer insulation layer 108. The inner shielding layer 107 is a thin copper strip with a longitudinal overlapping structure, which eliminates the uneven internal electric field within the explosion-proof cable 1. A flame-retardant wrapping tape 106 is wrapped around the outside of the inner shielding layer 107. The flame-retardant wrapping tape 106 is made of ceramicized silicone rubber tape, which forms a hard, ceramic-like heat-insulating layer when exposed to fire, thus providing a flame-retardant effect to the explosion-proof cable 1. A metal tubular shielding layer 105 is wrapped around the outside of the flame-retardant wrapping tape 106. The metal tubular shielding layer 105 is made of aluminum tubing. Using aluminum tubing as the core metal tubular shielding layer 105 provides physical isolation; even if an explosion occurs inside the cable, the robust metal tubing can completely contain the explosion flame, arc, and high-pressure gas within the tubing, preventing outward propagation. The outer sheath 103 is fitted over the metal tubular shielding layer 105, and the gap filling layer 104 is filled between the outer sheath 103 and the metal tubular shielding layer 105. The gap filling layer 104 is a flame-retardant intumescent material. The gap filling layer 104 is formed by filling the space between the metal tubular shielding layer 105 and the outer sheath 103 with a flame-retardant intumescent material (such as a rubber mixture containing aluminum hydroxide). When exposed to high temperatures, this material expands rapidly, blocking all gaps, further suffocating the flame and providing heat insulation. The outer sheath 103 is made of halogen-free, low-smoke, flame-retardant polyolefin material, ensuring flame retardancy, oil resistance, and weather resistance under normal conditions.

[0017] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are 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.

[0018] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A marine explosion-proof cable comprising an explosion-proof cable (1), characterized in that: The explosion-proof cable (1) comprises a core conductor (101), an inner insulation layer (102), an outer sheath (103), a gap filling layer (104), a metal tubular shielding layer (105), flame-retardant wrapping tape (106), an inner shielding layer (107), and an outer insulation layer (108). The inner insulation layer (102) wraps the core conductor (101) inside it, and the outer insulation layer (108) wraps all the inner insulation layers (102) inside it. The shielding layer (107) is wrapped around the outside of the outer insulation layer (108), the flame-retardant wrapping tape (106) is wrapped around the outside of the inner shielding layer (107), the metal tubular shielding layer (105) is wrapped around the outside of the flame-retardant wrapping tape (106), the outer sheath (103) is sleeved on the outside of the metal tubular shielding layer (105), and the gap filling layer (104) is filled between the outer sheath (103) and the metal tubular shielding layer (105).

2. Marine explosion-proof cable according to claim 1, characterized in that: The core conductor (101) is made of tin-plated copper wire.

3. Marine explosion-proof cable according to claim 1, characterized in that: The inner insulation layer (102) and the outer insulation layer (108) are made of cross-linked polyethylene and ethylene propylene rubber, respectively.

4. Marine explosion-proof cable according to claim 1, characterized in that: The inner shielding layer (107) is a thin copper strip and adopts a longitudinal overlapping structure.

5. Marine explosion-proof cable according to claim 1, characterized in that: The flame-retardant wrapping tape (106) is made of ceramicized silicone rubber tape material.

6. Marine explosion-proof cable according to claim 1, characterized in that: The metal tubular shielding layer (105) is made of aluminum tubing, the gap filling layer (104) is made of flame-retardant expansion material, and the outer sheath (103) is made of halogen-free low-smoke flame-retardant polyolefin material.

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