Basement stainless steel waterproof layer rat-proof power cable

Abstract

The utility model relates to the field of cables, and provides a basement stainless steel waterproof layer rat-proof power cable. In order to solve the problems that the radial waterproof performance of a power cable is insufficient and the ratproof performance is lost after a sheath is damaged in a humid environment such as a basement, the main scheme is that the power cable comprises a wire core assembly, a filling layer, a waterproof wrapping layer, a lining layer, a stainless steel waterproof layer and a ratproof sheath layer which are sequentially arranged from inside to outside, each wire core comprises a copper conductor (1) and a cross-linked polyethylene insulating layer (2) coated outside the copper conductor; and the waterproof wrapping layer is formed by wrapping at least two layers of waterproof yarn wrapping tapes (4). Through the structural improvement of the combination of the multiple waterproof wrapping layers and the welding type stainless steel tubular structure, the cooperative reinforcement of the waterproof and rat-proof performance is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of cables, and provides a basement stainless steel waterproof layer rat-proof power cable. BACKGROUND

[0002] In humid and rat-prone environments such as basements, subways, and tunnels, power cables need to have excellent waterproof and rat-proof performance to ensure the continuity and safety of power transmission. Traditional cables often use single materials or structural designs, such as adding waterproof agents to the sheath or using hard materials such as stainless steel to improve rat-proof ability. However, the existing technology still has the following shortcomings:

[0003] 1. Insufficient radial waterproof performance: The waterproof layer design of ordinary cables relies on the waterproof properties of the sheath material itself, lacking the synergistic effect of multi-layer waterproof structure. Especially in the cabling process, single-layer waterproof structure is prone to water seepage due to external forces or long-term humid environment, which cannot meet the stringent requirements of high humidity scenarios.

[0004] 2. Rat-proof performance depends on the integrity of the sheath: Existing rat-proof cables mainly rely on the mechanical strength of the sheath layer (such as stainless steel or hard plastic) to prevent rodents from biting. However, during installation or use, the sheath is easily damaged by mechanical impact, friction, and other external forces. Once the sheath is damaged, the internal structure is directly exposed, and the rat-proof ability is lost.

[0005] 3. Insufficient environmental friendliness: Traditional rat-proof sheath materials often use chemical rodent repellents to achieve rat-proof function. Such additives may contain heavy metals or harmful substances, posing a risk of environmental pollution with long-term use, and not meeting the green and environmentally friendly development trend.

[0006] To address the above problems, existing technologies attempt to improve performance by optimizing materials or local structure, such as using stainless steel sheath to enhance rat-proof ability, or using double-layer wrapping to improve waterproof performance, but they do not effectively solve the core problems of rat-proof ability dropping sharply after sheath damage and the lack of synergy of multi-layer waterproof structure. In addition, the environmental friendliness of rat-proof materials has not been fully considered.

[0007] Therefore, from the perspective of structural combination optimization, the present application proposes a composite structure cable integrating multi-layer waterproof wrapping, rigid stainless steel protective layer, and environmentally friendly rat-proof sheath, aiming to break through the performance bottleneck of single material or single layer structure through the synergistic effect of each layer structure, while meeting the requirements of waterproof, rat-proof, and environmental friendliness. SUMMARY

[0008] The present application aims to solve the problems of insufficient radial waterproof performance of power cables in humid environments such as basements and loss of rat-proof performance after sheath damage, and achieves synergistic reinforcement of waterproof and rat-proof performance through the combination of multi-layer waterproof wrapping and welded stainless steel tubular structure.

[0009] To achieve the above object the present application adopts the following technical means:

[0010] The present application provides a kind of basement stainless steel waterproof layer rat-proof electric cable, including following structure from inside to outside sequentially:

[0011] Wire core assembly, by a plurality of wire core stranding, each wire core includes copper conductor and the crosslinked polyethylene insulating layer covered in the copper conductor outer;

[0012] Filler layer, by non-hygroscopic filling rope filled in the gap of wire core assembly;

[0013] Waterproof wrapping layer, covering the wire core assembly and filler layer outer, by at least two waterproof yarn wrapping tape wrapping;

[0014] Inner liner, covering the waterproof wrapping layer outer, by flame-retardant polyvinyl chloride material;

[0015] Stainless steel waterproof layer, covering the inner liner outer, by the closed tubular structure of stainless steel belt welding;

[0016] Rat-proof sheath layer, covering the stainless steel waterproof layer outer, by environment-friendly rat-proof polyvinyl chloride material.

[0017] In the above scheme, the waterproof wrapping layer is double waterproof yarn wrapping tape, and the wrapping direction of the two layers of wrapping tape is opposite.

[0018] In the above scheme, the waterproof yarn wrapping layer adopts silica aerogel impregnated glass fiber felt tape, and the wrapping overlap rate is not less than 30%.

[0019] In the above scheme, the thickness of the stainless steel belt waterproof layer is 0.2-0.5mm.

[0020] In the above scheme, the stainless steel waterproof layer is a longitudinally sealed circular tube structure formed by continuous welding, and the weld extends along the cable axial direction.

[0021] In the above scheme, the filler layer is glass fiber rope or polypropylene fiber rope.

[0022] The present application significantly improves the waterproof, rat-proof and environmental performance of the cable in the basement and other harsh environments through the combination of multi-layer structure optimization and material synergistic design, and the specific effects are as follows:

[0023] 1. Significant improvement in radial waterproofing performance: Through the composite structure design of double-layer waterproof yarn wrapping layer and flame-retardant polyvinyl chloride inner lining layer, a multi-level waterproof barrier is formed. The waterproof yarn wrapping layer uses silica aerogel impregnated glass fiber felt tape, which has high hydrophobicity combined with wrapping overlap rate (≥30%), effectively blocking radial water penetration; the inner lining layer further seals the gap, preventing water vapor from penetrating to the core, so that the cable meets the stringent waterproofing requirements of high humidity scenarios.

[0024] 2. Decoupling of rat-proofing performance and sheath damage: The continuous welding formed stainless steel belt waterproof layer is used as a rigid protective layer, and its circular tube sealing structure (thickness 0.2-0.5mm) can still prevent rodents from biting through the mechanical strength of the stainless steel layer even if the external environment-friendly rat-proof polyvinyl chloride sheath layer is damaged, solving the problem of sudden drop in rat-proofing ability caused by sheath damage in traditional cables.

[0025] 3. Optimization of environmental performance: The environment-friendly rat-proof polyvinyl chloride sheath layer retains the anti-biting performance of traditional rat-proof materials, uses a non-heavy metal additive formula to reduce environmental pollution, and meets the development trend of green cables.

[0026] 4. Balancing structural reliability and production efficiency: The stainless steel belt welding process realizes continuous sealing and forming through special equipment (such as metal argon arc welding pipe machine), and the weld extends along the axial direction of the cable, ensuring the overall rigidity and sealing of the stainless steel layer. This structural feature directly improves product quality through structural improvement without involving process step limitations.

[0027] 5. Performance stacking to ensure comprehensive reliability: Each layer of structure (waterproof yarn wrapping layer, stainless steel waterproof layer, rat-proof sheath layer) forms a waterproof-mechanical protection-environmental protection synergy mechanism through functional complementation. For example, the stainless steel layer improves the compression strength, and the rat-proof sheath layer relieves the impact of external mechanical impact on the stainless steel layer, thereby prolonging the service life of the cable. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a cross-sectional schematic view of the present application;

[0029] Figure 2 is a weld schematic. DETAILED DESCRIPTION

[0030] The embodiments of the present application will be described in detail below. Although the present application will be described and illustrated in conjunction with some specific embodiments, it should be noted that the present application is not limited to only these embodiments. Rather, modifications or equivalent replacements to the present application should be covered within the scope of the claims of the present application.

[0031] In addition, for a better illustration of the present application, numerous specific details are given in the following detailed description. One skilled in the art will understand that the present application can be practiced without these specific details. Embodiments

[0032] The present application provides a basement stainless steel waterproof layer rat-proof power cable, comprising the following structures arranged in turn from inside to outside:

[0033] The core assembly is composed of a plurality of twisted cores, each core comprising a copper conductor 1 and a cross-linked polyethylene insulating layer 2 wrapped outside the copper conductor;

[0034] The filling layer is filled in the gap of the core assembly by non-hygroscopic filling rope;

[0035] The waterproof wrapping layer is wrapped outside the core assembly and the filling layer and is formed by wrapping at least two layers of waterproof yarn wrapping tape 4;

[0036] The inner liner 5 is wrapped outside the waterproof wrapping layer and is composed of flame-retardant polyvinyl chloride material;

[0037] The stainless steel waterproof layer is wrapped outside the inner liner and is a closed tubular structure 6 formed by welding stainless steel strips;

[0038] The rat-proof sheath layer is wrapped outside the stainless steel waterproof layer and is composed of environmentally friendly rat-proof polyvinyl chloride material 7.

[0039] In the above scheme, the waterproof wrapping layer is double-layer waterproof yarn wrapping tape, and the wrapping directions of the two layers of wrapping tape are opposite.

[0040] In the above scheme, the waterproof yarn wrapping layer 4 uses silica aerogel impregnated glass fiber felt tape, and the wrapping overlap rate is not less than 30%.

[0041] In the above scheme, the thickness of the stainless steel strip waterproof layer 6 is 0.2-0.5mm.

[0042] In the above scheme, the stainless steel waterproof layer 6 is a longitudinally sealed circular tube structure formed by continuous welding, and the weld extends along the axial direction of the cable.

[0043] In the above scheme, the filling layer 3 is a glass fiber rope or a polypropylene fiber rope. Embodiments

[0044] As shown in the above scheme, the present embodiment provides a basement stainless steel waterproof layer rat-proof power cable, which comprises the following structures arranged in turn from inside to outside: Figure 1

[0045] 1. Core assembly

[0046] ​It is composed of 3 copper conductors 1 with cross section of 25 mm2, each of which is uniformly coated with a cross-linked polyethylene insulation layer 2 (XLPE) with a thickness of 1.2 mm. The twisting method adopts concentric twisting, and the twisting pitch is 12 times the diameter of the conductor, which ensures the flexibility and electrical performance of the core structure.

[0047] 2. Filling layer

[0048] The gap of the core assembly is filled with non-hygroscopic glass fiber rope 3 (diameter 2.5 mm), and the filling density is more than 95% of the core gap, so as to eliminate internal voids and enhance the roundness of the cable. The glass fiber rope is treated by silicon oil immersion, which further reduces the hygroscopicity.

[0049] 3. Waterproof wrapping layer

[0050] As shown in Figure 2 , a double-layer silica aerogel impregnated glass fiber felt tape is wrapped around the core assembly and the filling layer. The wrapping process parameters are as follows:

[0051] The inner wrapping direction is left, and the outer layer is right, with a wrapping overlap rate of 35%;

[0052] The single-layer felt tape has a width of 50 mm, a thickness of 0.15 mm, and an aerogel load of 20% of the mass of the felt tape;

[0053] The wrapping tension is controlled within 15 N to avoid damaging the core.

[0054] This structure forms a dense waterproof barrier through double-layer reverse wrapping, and the hydrophobic angle of aerogel reaches 150°, which can effectively block radial water penetration.

[0055] Inner lining layer 5

[0056] It is coated outside the waterproof wrapping layer and formed by extrusion process using flame-retardant polyvinyl chloride, with a thickness of 1.0 mm (when the outer diameter before extrusion of the inner lining layer is ≤25 mm, the thickness is 1.0 mm, and when the outer diameter before extrusion of the inner lining layer is 25 mm, the thickness is 1.2 mm). The inner lining layer has a smooth surface and closely fits the inner wall of the stainless steel waterproof layer 6, reducing friction loss.

[0057] Stainless steel waterproof layer 6

[0058] It is continuously welded into a longitudinal sealed circular tube structure by argon arc welding of 304 stainless steel strips with a thickness of 0.3 mm. The weld extends along the axial direction of the cable, and after welding, eddy current detection is performed to ensure that there are no leakage points.

[0059] Rat-proof sheath layer 7

[0060] The environmentally friendly rat-proof polyvinyl chloride material (not containing heavy metal additive) is coated on the outside of the stainless steel layer through a double-layer co-extrusion process, and the thickness is 1.8 mm (when the outer diameter before sheath extrusion is less than or equal to 15 mm, the thickness is 1.8, when the outer diameter before sheath extrusion is greater than or equal to 15 mm and less than or equal to 25 mm, the thickness is 2.0, and when the outer diameter before sheath extrusion is greater than or equal to 25 mm, the thickness is 2.5 mm).

Claims

1. A rodent-proof power cable for a basement stainless steel waterproof layer, characterized by, The cable comprises the following structures arranged from inside to outside: A core assembly composed of a plurality of twisted cores, each core comprising a copper conductor (1) and a cross-linked polyethylene insulating layer (2) covering the copper conductor; A filling layer (3) filled in the gaps of the core assembly by non-hygroscopic filling ropes; A waterproof wrapping layer covering the core assembly and the filling layer, formed by wrapping at least two layers of waterproof yarn wrapping tape (4); An inner lining layer (5) covering the waterproof wrapping layer, composed of flame-retardant polyvinyl chloride material; A stainless steel waterproof layer (6) covering the inner lining layer, in the form of a closed tubular structure formed by welding stainless steel strips; A rat-proof sheath layer (7) covering the stainless steel waterproof layer, composed of environmentally friendly rat-proof polyvinyl chloride material.

2. The power cable according to claim 1, characterized in that: The waterproof wrapping layer is double-layered waterproof yarn wrapping tape, and the wrapping directions of the two layers are opposite.

3. The power cable according to claim 2, characterized in that: The waterproof yarn wrapping tape (4) is a silica aerogel impregnated glass fiber felt tape, and the wrapping overlap rate is not less than 30%.

4. The power cable according to claim 1, characterized in that: The thickness of the stainless steel strip waterproof layer (6) is 0.2-0.5mm.

5. The power cable according to claim 1, characterized in that: The stainless steel waterproof layer (6) is a longitudinally sealed circular tube structure formed by continuous welding, and the weld extends along the axial direction of the cable.

6. The power cable according to claim 1, characterized in that: The filling layer (3) is a glass fiber rope or a polypropylene fiber rope.

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