Nonmetal ratproof B1-level flame-retardant optical cable

Abstract

The utility model relates to a nonmetal ratproof B1-level flame-retardant optical cable, which comprises an optical cable core, a sheath and a comprehensive protection layer, a sheath is extruded outside the optical cable core, and a comprehensive protection layer is extruded outside the sheath; the optical cable core is formed by twisting a plurality of tight-buffered optical fibers and water-blocking aramid yarns into a bundle and then winding two water-blocking yarns with opposite twisting directions on the outside of the bundle, and the water-blocking aramid yarns are distributed in gaps among the tight-buffered optical fibers and play roles in water blocking and cable core reinforcement; the comprehensive protection layer is of an overall tubular closed structure and comprises a base body and reinforcing fibers located in the base body. The comprehensive protective layer structure is arranged on the outermost layer of the optical cable, can integrally protect all structural units of the optical cable, and has good rat bite prevention and B1-level flame retardant performance.

Description

Technical Field

[0001] This utility model belongs to the field of optical fiber and cable technology, specifically a non-metallic rodent-proof, B1-grade flame-retardant optical cable. Background Technology

[0002] With the development of communication technology, optical cables are being used more and more widely. Large quantities of optical cables are used in high-rise buildings, large indoor stadiums, smart substations, subways, and other indoor locations. Due to public safety considerations, these locations generally use non-metallic optical cables. Because optical cables lack a metallic protective layer, they are frequently damaged by rodents, causing communication and dispatching failures. On the other hand, indoor locations require increasingly higher flame-retardant performance.

[0003] In summary, a new type of optical cable structure is needed to solve the above problems, requiring the optical cable to have high flame retardancy and good rodent-proof structure. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a non-metallic rodent-proof B1-grade flame-retardant optical cable, the outermost layer of which has a fully enclosed integrated protective layer structure, which can protect all structural units of the optical cable. It has good anti-bite, tensile strength, and lateral pressure resistance, as well as superior heat insulation and flame-retardant performance.

[0005] According to the technical solution provided by this utility model, the non-metallic rodent-proof B1-grade flame-retardant optical cable includes an optical cable core, a sheath, and a composite protective layer.

[0006] The optical cable core is composed of multiple tight-buffered optical fibers and multiple bundles of water-blocking aramid yarn twisted together, and then two layers of water-blocking yarn twisted in opposite directions are wound around its outside. The water-blocking aramid yarn is distributed in the gaps between the tight-buffered optical fibers.

[0007] Preferably, a sheath is extruded over the outside of the optical cable core.

[0008] Preferably, a composite sheath is extruded onto the outside of the sheath. The composite sheath is an integral tubular structure, including a matrix and reinforcing fibers located within the matrix.

[0009] Preferably, the sheath is made of halogen-free, low-smoke, flame-retardant polyolefin.

[0010] Preferably, the matrix material is epoxy resin, and the reinforcing fiber material is glass fiber filament.

[0011] Preferably, the tight-buffered optical fiber consists of 7 G652D fibers, and the water-blocking aramid yarn consists of 12 bundles.

[0012] In summary, this utility model has at least one of the following beneficial technical effects:

[0013] 1. In this utility model, the comprehensive sheath is a composite structure composed of high-strength glass fiber as reinforcing fiber and epoxy resin as matrix material. It is extruded and wrapped around the outer edge of the sheath to form an integral tubular structure, which provides full-enclosed protection for the cable core. It can withstand greater compressive and tensile forces, has high rigidity and hardness, and has good rodent-proof, heat-insulating and high flame-retardant properties.

[0014] 2. In this utility model, the integrated sheath is placed on the outermost layer of the optical cable, which can effectively protect all structural units of the optical cable and make the optical cable more reliable against rodent bites;

[0015] 3. In this utility model, the cable core structure adopts a fully dry structure, and the sheath and composite protective layer are made of halogen-free, low-smoke, and non-toxic materials, which have good heat insulation and high flame retardant properties. They do not produce drippings when burning, and are low-smoke and non-toxic, meeting the B1-level combustion performance requirements. Attached Figure Description

[0016] Figure 1 This is a structural diagram of a non-metallic rodent-proof, B1-grade flame-retardant optical cable.

[0017] Explanation of reference numerals in the attached diagram: 1. Optical cable core; 11. Tight-buffered optical fiber; 12. Water-blocking aramid yarn; 13. Water-blocking yarn; 2. Sheath; 3. Composite sheath; 31. Matrix; 32. Reinforcing fiber. Detailed Implementation

[0018] 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.

[0019] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0020] Furthermore, "several" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0021] This utility model discloses a non-metallic rodent-resistant, B1-grade flame-retardant optical cable. (Refer to...) Figure 1 A non-metallic rodent-proof, B1-grade flame-retardant optical cable includes an optical cable core 1, a sheath 2, and a composite sheath 3; the sheath 2 is extruded over the outside of the optical cable core 1, and the composite sheath 3 is extruded over the outside of the sheath 2.

[0022] The optical cable core 1 includes tight-buffered optical fibers 11 and water-blocking aramid yarn 12. The water-blocking aramid yarn 12 is distributed in the gaps between the tight-buffered optical fibers 11. The tight-buffered optical fibers 11 and the water-blocking aramid yarn 12 are twisted into a bundle. The water-blocking aramid yarn 12 has both water-blocking and tensile strength functions. Its tensile strength can share the bending stress of the optical fiber during laying. Two strands of water-blocking yarn 13 with opposite twisting directions are wound around its outside. The double reverse twisted water-blocking yarn 13 forms a cross-covering layer, which effectively fills the physical gaps between the optical fiber bundles. It not only blocks the longitudinal water penetration path, but also reduces the lateral migration of moisture through the dense body. Compared with single-layer unidirectional winding, the reverse twisting process makes the thickness distribution of the water-blocking layer more uniform and avoids local weak points.

[0023] The tight-buffered optical fiber 11 consists of 7 G652D fibers, and the water-blocking aramid yarn 12 consists of 12 bundles.

[0024] The material of sheath 2 is halogen-free, low-smoke, flame-retardant polyolefin.

[0025] 4. The composite sheath 3 is an integral tubular structure. The composite sheath 3 includes a matrix 31 and reinforcing fibers 32 located within the matrix 31. The matrix 31 is made of epoxy resin, and the reinforcing fibers 32 are made of glass fiber filaments. The composite sheath 3 is a composite structure composed of high-strength glass fiber filaments as reinforcing fibers and epoxy resin as the matrix 31 material. It is extruded and wrapped around the outer edge of the sheath to form an integral tubular structure, which provides full-enclosed protection for the cable core. It can withstand greater compressive and tensile forces, has high rigidity and high hardness, and has good rodent-proof, heat-insulating, and flame-retardant properties.

[0026] The above are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. A non-metallic rodent-resistant, B1-grade flame-retardant optical cable, characterized in that: It includes optical cable core (1), sheath (2), and composite sheath (3); The optical cable core (1) is composed of multiple tight-buffered optical fibers (11) and water-blocking aramid yarn (12) twisted together, and then two layers of water-blocking yarn (13) twisted in opposite directions are wound around its outside. The water-blocking aramid yarn (12) is distributed in the gap between the tight-buffered optical fibers (11).

2. The non-metallic rodent-resistant, B1-grade flame-retardant optical cable as described in claim 1, characterized in that: The outer extruded sheath (2) of the optical cable core (1).

3. The non-metallic rodent-resistant, B1-grade flame-retardant optical cable as described in claim 2, characterized in that: The outer extruded composite sheath (3) of the sheath (2) is an integral tubular structure, including a matrix (31) and reinforcing fibers (32) located in the matrix (31).

4. The non-metallic rodent-resistant, B1-grade flame-retardant optical cable as described in claim 1, characterized in that: The tight-buffered optical fiber (11) consists of 7 G652D fibers, and the water-blocking aramid yarn (12) consists of 12 bundles.

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