Multilayer structure high flame retardant optical cable reinforcing core

Abstract

The utility model provides multi -layer structure high flame -retardant optical cable reinforcing core. Multi -layer structure high flame -retardant optical cable reinforcing core, including reinforcing member, the reinforcing member outer wall is equipped with filler layer, and the filler layer is talc layer, be equipped with a plurality of groups cable in the filler layer, the filler layer outside is equipped with pressure -resisting layer, and the pressure -resisting layer is annular wavy steel band layer, the pressure -resisting layer outside is provided with the anti -break layer, and the anti -break layer is polypropylene layer, the anti -break layer outside is equipped with flame -retardant layer, the flame -retardant layer outside fixed mounting has heat -resistant layer, and the heat -resistant layer is thermal insulation glass wool layer, the heat -resistant layer's outside fixed mounting has the protective layer. The utility model provides multi -layer structure high flame -retardant optical cable reinforcing core, and the H -shaped structure form of upper and lower flanges is used to reinforcing member and adds the web, and the problem of uneven stress distribution and low material utilization rate is solved perfectly through the structure optimization of H -shaped section, and simultaneously, a plurality of groups cable are arranged at the web both sides of H -shaped reinforcing member, can protect cable from being damaged to the greatest extent.

Description

Technical Field

[0001] This utility model relates to the field of optical cable technology, and in particular to a multi-layer structure high flame-retardant optical cable reinforcing core. Background Technology

[0002] As a crucial component ensuring the strength and stability of optical cables, the fiber optic cable reinforcing core plays a vital role in the installation, laying, and long-term use of optical cables. Especially in environments with extremely high fire safety requirements, the performance of high flame-retardant fiber optic cable reinforcing cores directly affects the reliability and security of communication networks. Currently, while commercially available high flame-retardant fiber optic cable reinforcing cores meet basic flame-retardant requirements to a certain extent, their shortcomings in flame-retardant durability, mechanical properties, and environmental adaptability are becoming increasingly apparent as application scenarios become more complex and safety performance requirements rise. Therefore, optimizing the design of high flame-retardant fiber optic cable reinforcing cores has significant practical importance and application value.

[0003] A high-strength flame-retardant optical fiber cable with Chinese patent publication number CN220171306U includes an optical cable body, the optical cable body including a reinforcing layer, a filling layer provided on the outside of the reinforcing layer, a plurality of cable cores provided in the filling layer, an antistatic layer provided on the outside of each plurality of cable cores, a pressure-resistant layer fixedly connected to the outside of the filling layer, a bending-resistant layer fixedly connected to the outside of the pressure-resistant layer, a flame-retardant layer fixedly connected to the outside of the bending-resistant layer, a heat-resistant layer fixedly connected to the outside of the flame-retardant layer, and a sheath layer fixedly connected to the outside of the heat-resistant layer.

[0004] In the aforementioned device, the reinforcing layer has a common circular cross-section, which is the mainstream form of existing reinforcing cores. Its advantages lie in its simple molding process and good stress uniformity, but its tensile efficiency is extremely low, making it prone to breakage and affecting the normal installation and use of optical cables. From the perspective of materials mechanics, the effective stress-bearing area of ​​a circular cross-section is low—when subjected to axial tensile force, only the material in the central area of ​​the cross-section fully participates in the stress distribution, while the edge material suffers from uneven stress distribution.

[0005] Therefore, it is necessary to provide a multi-layered, high flame-retardant optical cable reinforcing core to solve the above-mentioned technical problems. Utility Model Content

[0006] This utility model provides a multi-layer structure high flame-retardant optical cable reinforcing core, solving the problem of extremely low tensile efficiency of circular cross-section reinforcing cores. To address the aforementioned technical problem, the multi-layer structure high flame-retardant optical cable reinforcing core provided by this utility model includes a reinforcing member, a filling layer on the outer wall of the reinforcing member, several groups of cables in the filling layer, a pressure-resistant layer outside the filling layer, a bending-resistant layer outside the pressure-resistant layer, a flame-retardant layer outside the bending-resistant layer, a heat-resistant layer fixedly installed outside the flame-retardant layer, and a protective layer fixedly installed outside the heat-resistant layer.

[0007] Preferably, the cable includes a sheath, and several sets of the sheaths are located inside the filling layer, with several sets of optical fibers disposed inside each set of the sheaths.

[0008] Preferably, the flame retardant layer uses an intumescent flame retardant.

[0009] Preferably, the reinforcing member is I-shaped, with a structure consisting of upper and lower flanges and a middle web.

[0010] Preferably, a fourth diaphragm is provided at the connection between the pressure-resistant layer and the flexural layer, a third diaphragm is provided between the flexural layer and the flame-retardant layer, a second diaphragm is provided between the flame-retardant layer and the heat-resistant layer, and a first diaphragm is provided between the heat-resistant layer and the protective layer.

[0011] Preferably, the protective layer is a low-smoke, halogen-free, highly flame-retardant polyethylene and fluoroplastic composite material.

[0012] Compared with related technologies, the multi-layer structure high flame-retardant optical cable reinforcing core provided by this utility model has the following beneficial effects:

[0013] The reinforcement adopts an I-shaped structure with upper and lower flanges and a middle web. Through structural optimization, the I-shaped cross-section perfectly solves the problems of uneven stress distribution and low material utilization. At the same time, several sets of cables are set on both sides of the web of the I-shaped reinforcement, which can protect the cables from damage to the greatest extent. Attached Figure Description

[0014] Figure 1 A schematic diagram of a preferred embodiment of the multi-layer high flame-retardant optical cable reinforcing core provided by this utility model;

[0015] Figure 2 for Figure 1 The diagram shows the internal structure of the reinforcing member.

[0016] Figure 3 for Figure 2 The enlarged schematic diagram of part A shown below;

[0017] Figure 4 for Figure 2 The enlarged schematic diagram of part B is shown.

[0018] The numbers in the diagram are: 1. Protective layer, 2. Heat-resistant layer, 3. Flame-retardant layer, 4. Bending-resistant layer, 5. Pressure-resistant layer, 6. Filler layer, 7. Reinforcing component, 8. Cable, 81. Cable sleeve, 82. Optical fiber, 9. Diaphragm 1, 10. Diaphragm 2, 11. Diaphragm 3, 12. Diaphragm 4. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Please refer to the following: Figure 1 A schematic diagram of a preferred embodiment of the multi-layer high flame-retardant optical cable reinforcing core provided by this utility model; Figure 2 for Figure 1 The diagram shows the internal structure of the reinforcing member. Figure 3 for Figure 2 The enlarged schematic diagram of part A shown below; Figure 4 for Figure 2 The enlarged schematic diagram of section B is shown. The multi-layer high flame-retardant optical cable reinforcing core includes: a reinforcing member 7, a filling layer 6 on the outer wall of the reinforcing member 7, the filling layer 6 being a talc powder layer, a plurality of cable groups 8 on the filling layer 2, a pressure-resistant layer 5 on the outer side of the filling layer 6, the pressure-resistant layer 5 being an annular corrugated steel strip layer, a bending-resistant layer 4 on the outer side of the pressure-resistant layer 5, the bending-resistant layer 4 being a polypropylene layer, a flame-retardant layer 3 on the outer side of the bending-resistant layer 4, a heat-resistant layer 2 fixedly installed on the outer side of the flame-retardant layer 3, the heat-resistant layer 2 being a heat-insulating glass wool layer, and a protective layer 1 fixedly installed on the outer side of the heat-resistant layer 2.

[0021] The cable 8 includes a cable sleeve 81, and several sets of cable sleeves 81 are located inside the filling layer 6. Each set of cable sleeves 81 is provided with several sets of optical fibers 82. Flame-retardant and water-blocking fiber paste is provided between the optical fibers 82 and the cable sleeves 81.

[0022] The flame retardant layer 3 uses an intumescent flame retardant, which expands when heated to form a heat-insulating carbonaceous layer, thereby preventing heat transfer and flame spread and improving the flame retardant performance of the reinforcing core.

[0023] The reinforcing member 7 is I-shaped and adopts a structure with upper and lower flanges and a middle web.

[0024] The flanges can be made of carbon fiber and intumescent flame retardant composite layer, which can ensure high strength and improve flame retardancy; the web can be made of PBI fiber braided layer with better flexibility, which can reduce the risk of breakage when bending, while maintaining high temperature stability above 600℃.

[0025] A diaphragm 12 is provided at the connection between the pressure-resistant layer 5 and the flexural layer 4. A diaphragm 11 is provided between the flexural layer 4 and the flame-retardant layer 3. A diaphragm 10 is provided between the flame-retardant layer 3 and the heat-resistant layer 2. A diaphragm 9 is provided between the heat-resistant layer 2 and the protective layer 1.

[0026] The four diaphragms are designed to separate the different structural layers, and the diaphragms have tiny pores to prevent the connection between the structural layers from being broken.

[0027] The protective layer 1 is a composite material of low-smoke, halogen-free, high flame-retardant polyethylene and fluoroplastics.

[0028] The working principle of the multi-layer high flame-retardant optical cable reinforcing core provided by this utility model is as follows:

[0029] The filling layer 6 formed by the talc powder layer can cover multiple cables 8, providing good moisture protection. The antistatic layer on the outside of the cable 8 is made of PU foam to enhance the antistatic effect. The outer pressure-resistant layer 5 is a ring-shaped corrugated steel strip layer to enhance the pressure resistance. The bending-resistant layer 4 is a polypropylene layer to prevent bending and cracking. The flame-retardant layer 3 is a high-density foam layer to improve the flame-retardant effect of the cable. The heat-resistant layer 2 is a heat-insulating glass wool layer to better protect the cable. The reinforcing member 7 adopts an I-shaped structure with upper and lower flanges and a middle web. The I-shaped cross-section, through structural optimization, perfectly solves the problems of uneven stress distribution and low material utilization. At the same time, several groups of cables 8 are set on both sides of the web of the I-shaped reinforcing member 7 to maximize the protection of the cables 8 from damage.

[0030] Compared with related technologies, the multi-layer structure high flame-retardant optical cable reinforcing core provided by this utility model has the following beneficial effects:

[0031] The reinforcing member 7 adopts an I-shaped structure with upper and lower flanges and a middle web. Through structural optimization, the I-shaped cross-section perfectly solves the problems of uneven stress distribution and low material utilization. At the same time, several sets of cables 8 are set on both sides of the web of the I-shaped reinforcing member 7, which can protect the cables 8 from damage to the greatest extent.

[0032] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A multi-layered high flame-retardant optical cable reinforcing core, characterized in that, The device includes a reinforcing member, the outer wall of which is provided with a filling layer, the filling layer is provided with several sets of cables, a pressure-resistant layer is provided on the outside of the filling layer, an anti-bending layer is provided on the outside of the pressure-resistant layer, a flame-retardant layer is provided on the outside of the anti-bending layer, a heat-resistant layer is fixedly installed on the outside of the flame-retardant layer, and a protective layer is fixedly installed on the outside of the heat-resistant layer. The reinforcing member is I-shaped and adopts a structure with upper and lower flanges and a middle web.

2. The multi-layer structure high flame-retardant optical cable reinforcing core according to claim 1, characterized in that, The cable includes a sheath, and several sets of the sheaths are located inside the filling layer. Each set of the sheaths contains several sets of optical fibers.

3. The multi-layer structure high flame-retardant optical cable reinforcing core according to claim 1, characterized in that, The flame-retardant layer uses an intumescent flame retardant.

4. The multi-layer high flame-retardant optical cable reinforcing core according to claim 1, characterized in that, A diaphragm four is provided at the connection between the pressure-resistant layer and the flexural layer; a diaphragm three is provided between the flexural layer and the flame-retardant layer; a diaphragm two is provided between the flame-retardant layer and the heat-resistant layer; and a diaphragm one is provided between the heat-resistant layer and the protective layer.

5. The multi-layer structure high flame-retardant optical cable reinforcing core according to claim 1, characterized in that, The protective layer is a composite material of low-smoke, halogen-free, highly flame-retardant polyethylene and fluoroplastics.

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