Rat-proof and termite-proof photoelectric composite cable easy to penetrate through pipe

Abstract

The utility model discloses a rat-proof and termite-proof photoelectric composite cable easy to penetrate through a pipe, which comprises a power transmission unit, an optical communication unit and an armor layer, an outer protective layer made of polyurethane composite materials is arranged on the periphery of the armor layer, and a filling layer is arranged between the armor layer and the outer protective layer. A plurality of inner-layer fiber reinforcements extending in the axial direction and a plurality of outer-layer fiber reinforcements extending in the axial direction are embedded in the filling layer, and the number of the inner-layer fiber reinforcements is the same as that of the outer-layer fiber reinforcements. The inner-layer fiber reinforcements and the outer-layer fiber reinforcements are uniformly distributed on circumferences with different radiuses respectively, and are uniformly distributed at intervals along the circumferential direction. The photoelectric composite cable provided by the utility model is unique in structure, and effectively improves the comprehensive performances of rat and termite prevention and easy pipe penetration of the cable through a multi-dimensional protection structure.

Description

Technical Field

[0001] This utility model relates to a communication cable, and more particularly to an optoelectronic composite cable. Background Technology

[0002] In modern society, communication equipment and electrical equipment have become indispensable facilities in people's lives and work. Complex scenarios such as urban integrated pipe corridors and rail transit require compact optoelectronic composite cables that are both resistant to biological damage and easy to insert into pipes.

[0003] Current traditional rodent-proof optical-electric composite cables mainly rely on single-layer armor structures to achieve rodent protection. Typical solutions include metal armor (such as steel tape longitudinal armor and fine round steel wire armor) and non-metal armor (such as FRP rod armor), but they have systemic technical defects:

[0004] 1. Structural design contradictions: Although metal armor has high anti-biting strength, its inherent density causes a surge in cable weight, and its excessive rigidity results in a bending radius ≥20D (D is the cable diameter), which can easily cause a sudden increase in frictional resistance, jamming, or even sheath wear during conduit installation; while non-metallic armor (such as FRP rods) reduces weight, but has limited protection against biological attacks.

[0005] 2. Low space efficiency: Traditional armor layers require an additional 1.5-2.5mm thickness to meet mechanical strength requirements, resulting in composite cables with an outer diameter generally >15mm, which is difficult to adapt to the threading requirements of modern high-density cabling conduits (with a diameter ≤25mm accounting for more than 60%).

[0006] 3. Insufficient environmental adaptability: Existing armor material systems lack biochemical protection design. For example, steel strip armor is prone to intergranular corrosion when exposed to formic acid secreted by termites (annual corrosion rate > 0.1 mm), while FRP materials are prone to resin-fiber interface hydrolysis in humid and hot environments (strength reduction rate > 15% / year).

[0007] The aforementioned technical bottlenecks make it difficult for traditional solutions to simultaneously meet the engineering requirements of rodent protection, complex mechanical stress resistance, and efficient pipe-through construction under the constraint of limited outer diameter, which seriously restricts their application in scenarios such as data centers and urban utility tunnels. Utility Model Content

[0008] The technical problem to be solved by this utility model is to provide a uniquely structured optoelectronic composite cable that effectively improves the cable's overall performance in terms of rodent and ant protection and ease of pipe insertion through a multi-dimensional protective structure.

[0009] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:

[0010] A rodent-proof, ant-proof, and easily pierced optical-electric composite cable includes a power transmission unit, an optical communication unit, and an armor layer. An outer sheath of polyurethane composite material is also provided around the armor layer. A filling layer is provided between the armor layer and the outer sheath. A plurality of axially extending inner fiber reinforcement members and a plurality of axially extending outer fiber reinforcement members are embedded in the filling layer. The number of inner and outer fiber reinforcement members is the same. The inner and outer fiber reinforcement members are evenly distributed on circumferences of different radii and are evenly spaced along the circumference.

[0011] Furthermore, the radial distance between the outer sheath and the inner and outer fiber reinforcements remains consistent, so the outer sheath has a circumferential, gear-like shape.

[0012] Furthermore, the filling layer is a PE filling layer.

[0013] Furthermore, the optical communication unit includes an optical fiber and a loose tube, with a water-blocking layer filling the space between the optical fiber and the loose tube.

[0014] Furthermore, the power transmission unit includes a conductor and an insulating layer.

[0015] Furthermore, the conductor is composed of multiple strands of copper wire twisted together and then wrapped within the insulating layer.

[0016] Furthermore, the outer protective layer is made of military-grade high-strength polyurethane composite material.

[0017] Furthermore, the armor layer is a stainless steel spiral armor structure with a pitch / diameter ratio of 0.816.

[0018] The optical-electric composite cable of this invention has a unique structure, which effectively improves the cable's overall performance in terms of rodent and ant protection and easy pipe penetration through a multi-dimensional protective structure.

[0019] (1) A high-hardness and high-smoothness polyurethane composite material outer sheath is used as the first barrier against biological damage to the composite cable; in particular, the use of military-grade high-strength polyurethane composite material results in even higher protective strength. The Rockwell hardness of the material surface can reach ≥90HR, and the smoothness reaches Ra0.4 micrometer level. Through the microscopic mirror effect, a dual barrier is achieved: it forms a physical barrier that termites find difficult to attach to, and completely eliminates the need for traditional chemical coatings, thus avoiding the risk of soil ecological pollution. ASTM D638 testing has verified that when the surface layer thickness is ≥0.5mm, it can withstand the gnawing damage of rodent crown pressure up to 45MPa.

[0020] (2) The inner and outer fiber reinforcements are arranged in a double-layer three-dimensional manner to form an enhanced three-dimensional composite rodent-proof structure, which serves as the second barrier for the composite cable to prevent biological damage and significantly improves its anti-gnawing and anti-penetration performance.

[0021] (3) The armored structure serves as a third barrier against biological damage to the composite cable. In particular, the stainless steel spiral armored structure and optimized pitch design demonstrate excellent resistance to lateral pressure in the radial compression test. When subjected to a uniformly distributed load of 12 kN / m, the radial deformation is controlled within 0.3%, forming an insurmountable ultimate protective barrier.

[0022] Through the synergistic innovation of material mechanical properties and spatial structure, this system constructs a triple protection mechanism of "surface contact defense - internal support defense - overall structural defense". It has been tested and verified by the JB / T10696.10 standard, and its comprehensive protection effectiveness is 47% higher than that of traditional solutions. It is particularly suitable for long-term protection needs in complex biological attack environments such as underground integrated pipe corridors.

[0023] (4) The innovative inlay of double-layer fiber reinforcements constructs a three-dimensional rigid support structure, which greatly improves radial stiffness, significantly suppresses sheath deformation, and effectively reduces tube insertion resistance. Furthermore, the outer sheath of the composite cable adopts a gear-like design. By optimizing the tooth profile parameters, the circumferential contact area is reduced to 42% of that of the traditional structure, significantly reducing the interface friction during tube insertion. At the same time, since the outer sheath is made of military-grade high-strength polyurethane composite material, it can be combined with plasma surface modification processes to achieve an ultra-low friction coefficient μ=0.28±0.02, ensuring a smooth and unobstructed tube insertion process. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the rodent-proof, ant-proof, easy-to-penetrate optical fiber composite cable of this utility model.

[0025] In the picture:

[0026] 1. Optical communication unit 11. Coated optical fiber

[0027] 12. Loose sleeve 13. Water-blocking layer

[0028] 2. Transmission Unit 21. Conductor

[0029] 22. Insulation layer 3. Stainless steel spiral armor layer

[0030] 4. Inner fiber reinforcement 5. Outer fiber reinforcement

[0031] 6. Filler layer 7. Outer protective layer Detailed Implementation

[0032] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0033] A rodent-proof, ant-proof, and easy-to-penetrate optical-electric composite cable includes a power transmission unit 2, an optical communication unit 1, and a stainless steel spiral armor layer 3. The stainless steel spiral armor layer 3 adopts a 304L super austenitic stainless steel spiral armor structure, and its pitch / diameter ratio is 0.816 through a pitch design optimized by the golden ratio.

[0034] The optical communication unit 1 includes an optical fiber 11 and a loose tube 12, with a water-blocking layer 13 filling the space between the optical fiber 11 and the loose tube 12. The power transmission unit 2 includes a conductor 21 and an insulation layer 22; the conductor 21 is composed of multiple strands of copper wire twisted together and then wrapped within the insulation layer 22. Other types of optical communication units 1 and power transmission units 2 can also be used depending on the product type.

[0035] A military-grade high-strength polyurethane composite outer sheath 7 is also provided around the armor layer 3. A filling layer 6 (filling layer 6 is a PE filling layer) is provided between the armor layer 3 and the outer sheath 7. Nine axially extending inner fiber reinforcement members 4 and nine axially extending outer fiber reinforcement members 5 are embedded in the filling layer 6. Depending on the design or the diameter of the composite cable, other numbers of inner fiber reinforcement members 4 and outer fiber reinforcement members 5 can also be provided. As long as the number of inner fiber reinforcement members 4 and outer fiber reinforcement members 5 is the same, the inner fiber reinforcement members 4 and outer fiber reinforcement members 5 are evenly distributed on circumferences of different radii and are evenly spaced along the circumferential direction (regardless of the radius).

[0036] The radial distance between the outer sheath 7 and the inner fiber reinforcement 4 and the outer fiber reinforcement 5 is consistent. Since the inner and outer fiber reinforcements 4 and 5 are staggered in the circumferential direction, the outer sheath 7 is radially recessed at the position corresponding to the inner fiber reinforcement 4, thereby forming a convex-concave gear-like shape in the circumferential direction.

[0037] The military-grade high-strength polyurethane composite outer sheath 7 possesses extremely high hardness and exceptional smoothness, forming the first barrier against biological damage to the composite cable. Furthermore, its gear-like design reduces the circumferential contact area to 42% of traditional structures, significantly decreasing interfacial friction during cable insertion. Simultaneously, the military-grade high-strength polyurethane composite material of the outer sheath, combined with plasma surface modification technology, achieves an ultra-low coefficient of friction μ=0.28±0.02, ensuring a smooth and unobstructed cable insertion process.

[0038] The optical-electric composite cable of this invention has the advantages of being resistant to rodents and ants, having low friction, high compressive strength, high tensile strength, and strong environmental resistance. It not only simplifies the wiring requirements of the system and reduces installation costs and maintenance difficulties, but also shows good adaptability and stability in harsh environments. The outer sheath made of military-grade high-strength polyurethane composite material enables the composite cable to operate stably for a long time in harsh environments.

[0039] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications and improvements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the claims.

Claims

1. A rodent-proof, ant-proof, easy-to-penetrate optical-electric composite cable, comprising a power transmission unit, an optical communication unit, and an armor layer, characterized in that: A polyurethane composite outer sheath is provided around the armor layer. A filling layer is provided between the armor layer and the outer sheath. A plurality of axially extending inner fiber reinforcements and a plurality of axially extending outer fiber reinforcements are embedded in the filling layer. The number of inner and outer fiber reinforcements is the same. The inner and outer fiber reinforcements are evenly distributed on circumferences of different radii and are evenly spaced along the circumference.

2. The composite cable as described in claim 1, characterized in that: The radial distance between the outer sheath and the inner and outer fiber reinforcements remains consistent, so the outer sheath has a circumferential, gear-like shape.

3. The composite cable as described in claim 1, characterized in that: The filling layer is a PE filling layer.

4. The composite cable as described in claim 1, characterized in that: The optical communication unit includes an optical fiber and a loose tube, with a water-blocking layer filling the space between the optical fiber and the loose tube.

5. The composite cable as described in claim 1, characterized in that: The power transmission unit includes a conductor and an insulating layer.

6. The composite cable as described in claim 5, characterized in that: The conductor is composed of multiple strands of copper wire twisted together and then wrapped within the insulating layer.

7. The composite cable as described in claim 1, characterized in that: The outer protective layer is made of military-grade high-strength polyurethane composite material.

8. The composite cable as described in any one of claims 1 to 7, characterized in that: The armor layer is a stainless steel spiral armor structure with a pitch / diameter ratio of 0.816.

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