Flame-retardant and fire-resistant optical cable for expressway

Abstract

The cable comprises a cushion layer and a plurality of sleeves, the sleeves are wrapped on the outer wall of the cushion layer at equal intervals, fiber paste is arranged in the sleeves, the outer walls of the sleeves are wrapped with a second water-blocking tape, the outer wall of the second water-blocking tape is wrapped with an aluminum tape, and the aluminum tape is wrapped with a sheath. The aluminum tape is covered with a first low-smoke halogen-free layer, a third water-blocking tape is arranged on the first low-smoke halogen-free layer, an armor layer is arranged on the third water-blocking tape, a third low-smoke halogen-free layer is arranged on the armor layer, cable paste is arranged in gaps between the cushion layer and the sleeves, and the cable paste is arranged in the gaps between the cushion layer and the sleeves. According to the utility model, any cross section on the cushion layer is composed of the plurality of surrounding sleeves, the sleeves are filled with the fiber paste, the usage amount of the cable paste in the optical cable is reduced, a specific dry structure is adopted to replace traditional ointment filling, and high-performance optical fiber materials and special flame-retardant fireproof sheath materials are used. The fireproof performance and the mechanical performance of the optical cable are improved.

Description

Technical Field

[0001] This utility model relates to the field of communication optical cable technology, specifically a flame-retardant and fire-resistant optical cable for highways. Background Technology

[0002] Optical fiber cable is a telecommunications cable used to transmit optical signals. It consists of one or more optical fibers, each made of a high-refractive-index material, typically silicon or plastic. These fibers are encased in a protective layer, usually made of polymer material, to protect them from damage caused by the external environment. Flame-retardant and fire-resistant optical fiber cable is a specially designed and manufactured cable with excellent flame-retardant and fire-resistant properties, enabling the communication system to continue operating normally during a fire. It is mainly used in buildings, underground passages, subways, and tunnels, as well as in environments with high performance requirements for communication systems, for transmitting data and communication signals. Significant progress has been made in materials for flame-retardant and fire-resistant optical fiber cables used on highways. However, the large amount of grease present in traditional optical cables not only fails to retard flames but also promotes combustion, and the overall flame-retardant effect of the cable does not meet market demands, while the mechanical properties and fire resistance of the cable are also poor. Utility Model Content

[0003] The purpose of this utility model is to provide a flame-retardant and fire-resistant optical cable for highways, in order to solve the problems mentioned in the background art, such as the large amount of grease in traditional optical cables not only failing to retard flames but also acting as a combustion promoter, the flame-retardant effect of the overall optical cable not meeting market requirements, and the poor mechanical properties and fire resistance of the optical cable.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a flame-retardant and fire-resistant optical cable for highways, comprising a pad and multiple sleeves, the multiple sleeves being equidistantly wrapped around the outer wall of the pad, fiber grease being disposed inside the multiple sleeves, a second water-blocking tape being wrapped around the outer wall of the multiple sleeves, an aluminum strip being wrapped around the outer wall of the second water-blocking tape, a first low-smoke halogen-free layer being covered on the aluminum strip, a third water-blocking tape being disposed on the first low-smoke halogen-free layer, an armor layer being disposed on the third water-blocking tape, a third low-smoke halogen-free layer being disposed on the armor layer, and cable grease being disposed in the gaps between the pad and the multiple sleeves.

[0005] As a preferred embodiment of this utility model, the outer wall of the aluminum strip is provided with an inner sheath, the outer wall of the inner sheath is provided with a water-blocking strip, the outer wall of the water-blocking strip is provided with a steel strip, and the outer wall of the steel strip is provided with an outer sheath.

[0006] As a preferred embodiment of this utility model, a central reinforcing member is provided in the middle of the padding layer.

[0007] As a preferred technical solution of this utility model, the outer sheath adopts symmetrical color stripe markings on both sides.

[0008] As a preferred technical solution of this utility model, the outer wall of the outer sheath is provided with a low-smoke halogen-free layer II.

[0009] As a preferred embodiment of this utility model, the outer diameter of the pad layer with more than 144 cores is greater than 20mm.

[0010] Compared with the prior art, the beneficial effects of the present invention are:

[0011] 1. The cable is constructed by multiple surrounding sleeves at any cross-section of the underlayment, with fiber optic grease filling the sleeves. The amount of grease used in the optical cable is reduced, and a specific dry structure replaces traditional oil-based filling. Traditional large amounts of oil-based filling not only fail to retard flames but also promote combustion. By reducing the amount of oil-based filling and adding dry materials, a good flame-retardant effect is achieved. The flame-retardant and fire-resistant optical cable uses high-performance flame-retardant materials with higher fire resistance temperatures, lower smoke generation rates, and lower toxicity. These materials effectively prevent the spread of fire in a fire and protect the optical fibers inside the cable from damage. This project improves the tensile properties of the optical cable, extends its service life, and makes it suitable for overhead environments. By using high-performance optical fiber materials and special flame-retardant and fire-resistant sheath materials, the fire resistance and transmission stability of the optical cable are significantly improved. Combined with dry water-blocking tape and longitudinal wrapping technology, multi-layer longitudinal wrapping, one-time molding, and constant tension control processes are achieved, significantly improving the fire resistance and mechanical properties of the optical cable.

[0012] 2. By employing multi-layer longitudinal wrapping technology, better shaping and constant tension control of the optical cable sheath are achieved. This technology not only improves the fire resistance of the optical cable but also enhances its mechanical properties and durability. The optical cable meets the B1 flame retardant requirements of GB / T 31248-2014. For cables with 144 cores or more and an outer diameter exceeding 20mm, the flame retardant performance is further enhanced. The outer sheath of the optical cable uses symmetrical color stripes on both sides for identification, making the cable easier to identify during deployment and maintenance, reducing the possibility of misoperation, and enabling the cable to achieve greater functionality. Attached Figure Description

[0013] Figure 1 This is a front perspective view of the present invention;

[0014] Figure 2 This is a cross-sectional view of the present invention;

[0015] Figure 3 This is a cross-sectional view of the present invention;

[0016] Figure 4 This is a structural breakdown diagram of the present invention;

[0017] Figure 5 This is a side view of the present invention;

[0018] Figure 6 This is a structural diagram illustrating the low-smoke halogen-free layer 1, the water-blocking strip 3, the armor layer, and the low-smoke halogen-free layer 3 of this utility model.

[0019] In the diagram: 1. Insulation layer; 2. Outer sheath; 3. Central reinforcement; 4. Steel strip; 5. Water-blocking strip one; 6. Inner sheath; 7. Aluminum strip; 8. Water-blocking strip two; 9. Cable grease; 10. Sleeve; 11. Fiber grease; 12. Low smoke halogen-free layer two; 13. Low smoke halogen-free layer one; 14. Water-blocking strip three; 15. Armor layer; 16. Low smoke halogen-free layer three. Detailed Implementation

[0020] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0021] Please see Figure 1-6 This utility model provides a flame-retardant and fire-resistant optical cable for highways, including a pad layer 1 and multiple sleeves 10. The multiple sleeves 10 are equidistantly wrapped around the outer wall of the pad layer 1. Fiber grease 11 is provided inside each of the multiple sleeves 10. Water-blocking tape 2 8 is wrapped around the outer wall of the multiple sleeves 10. Aluminum tape 7 is wrapped around the outer wall of water-blocking tape 2 8. A low-smoke halogen-free layer 13 is covered on the aluminum tape 7. Water-blocking tape 3 14 is provided on the low-smoke halogen-free layer 13. Armor layer 15 is provided on the water-blocking tape 3 14. Low-smoke halogen-free layer 3 16 is provided on the armor layer 15. Cable grease 9 is provided in the gaps between the pad layer 1 and the multiple sleeves 10.

[0022] Any cross-section of the padding layer 1 consists of multiple surrounding sleeves 10, and the sleeves 10 contain fiber grease 11 for filling. The amount of cable grease 9 used in the optical cable is reduced. The outer side of the padding layer 1 is wrapped with water-blocking tape 2 8, followed by a longitudinally wrapped aluminum tape 7. After the aluminum tape 7, a layer of high flame-retardant, low-smoke, halogen-free material, low-smoke, halogen-free layer 13, is covered. A dry-type water-blocking tape 3 14 is then longitudinally wrapped, followed by an armor layer 15. The outer side of the armor layer 15 is wrapped with a layer of high flame-retardant, low-smoke, halogen-free material, low-smoke, halogen-free layer 3 16. A specific dry structure replaces the traditional grease filling. The traditional large amount of grease not only does not retard flame but also promotes combustion. By reducing the amount of grease used and adding dry materials, a good flame-retardant effect is achieved. The flame-retardant and fire-resistant optical cable uses high-performance flame-retardant materials with higher fire resistance temperature, lower smoke generation rate, and lower toxicity. These materials effectively prevent the spread of fire and protect the optical fibers inside the cable from damage. This project improves the tensile strength of the optical cable, extends its service life, and makes it suitable for overhead environments. By using high-performance optical fiber materials and special flame-retardant and fire-resistant sheath materials, the fire resistance and transmission stability of the optical cable are significantly improved. Combined with dry-type water-blocking tape and longitudinal wrapping technology, multi-layer longitudinal wrapping, one-time molding, and constant tension control processes are achieved, significantly improving the fire resistance and mechanical properties of the optical cable.

[0023] The outer wall of the aluminum strip 7 is provided with an inner sheath 6, the outer wall of the inner sheath 6 is provided with a water-blocking strip 5, the outer wall of the water-blocking strip 5 is provided with a steel strip 4, and the outer wall of the steel strip 4 is provided with an outer sheath 2. A central reinforcing member 3 is provided in the middle of the padding layer 1. The outer sheath 2 is marked with symmetrical color stripes on both sides. The outer wall of the outer sheath 2 is provided with a low-smoke halogen-free layer 12. The outer diameter of the cores in the padding layer 1 exceeding 144 is greater than 20mm.

[0024] The use of multi-layer longitudinal wrapping technology enables better shaping and constant tension control of the optical cable sheath. This technology not only improves the fire resistance of the optical cable but also enhances its mechanical properties and durability. The optical cable meets the B1 flame retardant requirements of GB / T31248-2014. For cables with 144 cores or more and an outer diameter exceeding 20mm, the flame retardant performance is further enhanced. The outer sheath of the optical cable uses symmetrical color stripes on both sides for identification, making the cable easier to identify during deployment and maintenance, and reducing the possibility of mishandling.

[0025] In this invention, any cross-section of the padding layer 1 is composed of multiple surrounding sleeves 10, and the sleeves 10 contain fiber grease 11 for filling. The amount of cable grease 9 used in the optical cable is reduced. The outer side of the padding layer 1 is wrapped with a water-blocking tape 2 8, followed by a longitudinally wrapped aluminum tape 7. After the aluminum tape 7, a high flame-retardant, low-smoke, halogen-free material low-smoke, halogen-free layer 13 is covered. A dry-type water-blocking tape 3 14 is then longitudinally wrapped, followed by a surrounding armor layer 15. The outer side of the armor layer 15 is wrapped with a high flame-retardant, low-smoke, halogen-free material low-smoke, halogen-free layer 3 16. A specific dry structure replaces the traditional grease filling. Traditional large amounts of grease not only fail to retard flames but also promote combustion. By reducing the amount of grease used and adding dry materials, a good flame-retardant effect is achieved. The flame-retardant and fire-resistant optical cable uses high-performance flame-retardant materials with higher fire resistance temperature, lower smoke generation rate, and lower toxicity. These materials effectively prevent the spread of fire and protect the optical fibers inside the cable from damage. This project improves the tensile strength of the optical cable, extends its service life, and makes it suitable for overhead environments. By using high-performance optical fiber materials and special flame-retardant and fire-resistant sheath materials, the fire resistance and transmission stability of the optical cable are significantly improved. Combined with dry-type water-blocking tape and longitudinal wrapping technology, multi-layer longitudinal wrapping, one-time molding, and constant tension control processes are achieved, significantly improving the fire resistance and mechanical properties of the optical cable.

[0026] The use of multi-layer longitudinal wrapping technology enables better shaping and constant tension control of the optical cable sheath. This technology not only improves the fire resistance of the optical cable but also enhances its mechanical properties and durability. The optical cable meets the B1 flame retardant requirements of GB / T31248-2014. For cables with 144 cores or more and an outer diameter exceeding 20mm, the flame retardant performance is further enhanced. The outer sheath uses symmetrical color stripes on both sides for identification, making the cable easier to identify during deployment and maintenance, reducing the possibility of misoperation, and enabling the cable to perform more diverse functions.

[0027] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A flame-retardant and fire-resistant optical cable for highways, comprising a pad layer (1) and multiple sheaths (10), characterized in that: Multiple sleeves (10) are equidistantly wrapped around the outer wall of the pad (1). Fiber grease (11) is provided inside each of the multiple sleeves (10). Water-blocking tape II (8) is wrapped around the outer wall of the multiple sleeves (10). Aluminum strip (7) is wrapped around the outer wall of the water-blocking tape II (8). A low-smoke halogen-free layer I (13) is covered on the aluminum strip (7). Water-blocking tape III (14) is provided on the low-smoke halogen-free layer I (13). Armor layer (15) is provided on the water-blocking tape III (14). Low-smoke halogen-free layer III (16) is provided on the armor layer (15). Cable grease (9) is provided in the gap between the pad (1) and the multiple sleeves (10).

2. The flame-retardant and fire-resistant optical cable for highways according to claim 1, characterized in that: The outer wall of the aluminum strip (7) is provided with an inner sheath (6), the outer wall of the inner sheath (6) is provided with a water-blocking strip (5), the outer wall of the water-blocking strip (5) is provided with a steel strip (4), and the outer wall of the steel strip (4) is provided with an outer sheath (2).

3. The flame-retardant and fire-resistant optical cable for highways according to claim 1, characterized in that: A central reinforcing member (3) is provided in the middle of the padding layer (1).

4. The flame-retardant and fire-resistant optical cable for highways according to claim 2, characterized in that: The outer sheath (2) is marked with symmetrical color stripes on both sides.

5. A flame-retardant and fire-resistant optical cable for highways according to claim 2, characterized in that: The outer wall of the outer sheath (2) is provided with a low-smoke halogen-free layer II (12).

6. The flame-retardant and fire-resistant optical cable for highways according to claim 1, characterized in that: The outer diameter of the core layer (1) with more than 144 cores is greater than 20 mm.

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