Outdoor overhead flame-retardant splayed optical cable

Abstract

The utility model provides an outdoor overhead flame-retardant splayed optical cable. The outdoor overhead flame-retardant splayed optical cable comprises optical fibers, a loose tube, a waterproof layer, a first reinforcing member, an outer sheath and a second reinforcing member. Wherein the fiber paste filled between the loose tube and the optical fiber has a super-hydrophobic effect and certain viscoelasticity, plays a certain role in blocking water and protecting the optical fiber, and prevents water seepage of the optical cable; the waterproof layer wrapping the outer side of the loose tube has the effect of rapidly expanding after absorbing water and is used for preventing water seepage of the optical cable in the transverse direction and the longitudinal direction; the arrangement of the first reinforcers enables the optical cable to have excellent anti-biting, anti-bird pecking, anti-shotgun, flame-retardant and anti-typhoon capabilities, and the arrangement of the second reinforcers enables the optical cable to have better lateral force resistance. The arrangement of the suspension wire can further improve the tensile performance of the optical cable.

Description

Technical Field

[0001] The utility model belongs to the technical field of optical cables, and in particular relates to an outdoor overhead flame-retardant figure-eight optical cable. Background Art

[0002] With the needs of economic development, the use of optical cables has increased year by year. At present, the structure of optical cables is also constantly improving. Optical cables have been transformed from traditional structures to new optical cables that meet the existing market needs and adapt to the laying environment requirements, reduce costs and save resources.

[0003] In the prior art, most optical cables are central sleeve overhead figure-eight structures, generally, multiple reinforcement members (aramid, glass fiber yarn or steel-aluminum tape) and suspension wire phosphating steel wires are twisted around the central loose sleeve to form a load-bearing structure, and a layer of steel-polyethylene bonding sheath is extruded between the cable core and the steel wire to form a stable central plastic tube figure-eight structure.

[0004] However, when the existing optical cables are laid in outdoor environments, they still have problems such as poor tensile strength, low flame retardancy and easy damage. Utility Model Content

[0005] In view of this, the purpose of the utility model is to provide an outdoor overhead flame-retardant figure-eight optical cable, which has good tensile strength, flame-retardant properties, and good overall protection capabilities.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The utility model provides an outdoor overhead flame-retardant figure-eight optical cable, comprising:

[0008] optical fiber;

[0009] A loose tube, wherein the loose tube wraps the optical fiber, and a fiber paste is filled between the loose tube and the optical fiber;

[0010] A water-blocking layer, the water-blocking layer is coated on the outside of the loose tube;

[0011] A first reinforcement member, the first reinforcement member is wound around the outer side of the water blocking layer;

[0012] An outer sheath, the outer sheath is flat and wraps the first reinforcement member;

[0013] A second reinforcement member, the second reinforcement member is symmetrically arranged inside the outer sheath with the optical fiber as the axis, the number of the reinforcement members is an even number, and the reinforcement members are symmetrically arranged relative to the loose tube;

[0014] A suspension wire is connected to the outer sheath.

[0015] Preferably, the water blocking layer is composed of a water blocking tape, and the water blocking tape is wound around the outside of the loose tube.

[0016] Preferably, the thickness of the water-blocking layer is 0.15-0.8 mm.

[0017] Preferably, the number of the second reinforcement members is 4, wherein two reinforcement members are symmetrically distributed longitudinally with the optical fiber as the axis, and the other two reinforcement members are symmetrically distributed transversely with the optical fiber as the axis.

[0018] Preferably, the outdoor overhead flame-retardant figure-eight optical cable also includes a metal armor layer.

[0019] Preferably, the metal armor layer is coated on the inner side of the loose tube.

[0020] Preferably, the outer sheath is a flame retardant outer sheath.

[0021] Preferably, the number of the optical fibers is 1 or more.

[0022] Preferably, a color coating is provided on the outer side of the optical fiber.

[0023] Preferably, the outer diameter of the optical fiber is 160 μm to 265 μm.

[0024] Preferably, the outdoor overhead flame-retardant figure-eight optical cable further comprises a color strip, and the color strip is arranged below the outer sheath.

[0025] Compared with the prior art, the beneficial effects of the utility model are:

[0026] The utility model provides an outdoor overhead flame-retardant figure-eight optical cable, wherein the fiber paste filled between the loose tube and the optical fiber has a super-hydrophobic effect and has a certain viscoelasticity, plays a certain role of water blocking and protecting the optical fiber, and prevents water seepage of the optical cable; the water-blocking layer coated on the outside of the loose tube has the effect of rapid expansion after absorbing water, which is used to prevent water seepage in the horizontal and vertical directions of the optical cable; the setting of the first reinforcement member enables the optical cable to have excellent anti-bite, anti-bird pecking, anti-bird gun, flame retardant and typhoon resistance; the outer sheath wrapped around the first reinforcement member is preferably a flame-retardant outer sheath, which can provide excellent flame retardant and fire resistance for the optical cable, and prevent the flame from burning along the optical cable during use, avoiding the formation of secondary disasters; the setting of the second reinforcement member enables the optical cable to have better lateral force resistance; the setting of the suspension line can further increase the tensile strength of the optical cable. Further, the optical cable also includes a metal armor layer coated on the inner side of the loose tube, wherein the metal armor layer forms an inner protective structure of the optical cable, improving the overall protection capability of the overall optical cable. In addition, the utility model further provides a color strip in the optical cable, which can be used to identify the appearance of the optical cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic cross-sectional view of an outdoor overhead flame-retardant figure-eight optical cable provided by the utility model;

[0028] Among them, 1 is the suspension wire, 2 is the outer sheath, 3 is the second reinforcement, 4 is the first reinforcement, 5 is the second reinforcement, 6 is the second reinforcement, 7 is the water-blocking layer, 8 is the metal armor layer, 9 is the loose tube, 10 is the optical fiber, 11 is the fiber paste, 12 is the second reinforcement, and 13 is the color strip. DETAILED DESCRIPTION

[0029] The following will be combined with the embodiments of the utility model to clearly and completely describe the technical solution of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] In view of the shortcomings of the prior art, the utility model provides an outdoor overhead flame-retardant figure-eight optical cable, comprising:

[0031] optical fiber;

[0032] A loose tube, wherein the loose tube wraps the optical fiber, and a fiber paste is filled between the loose tube and the optical fiber;

[0033] A water-blocking layer, the water-blocking layer is coated on the outside of the loose tube;

[0034] A first reinforcement member, the first reinforcement member is wound around the outer side of the water blocking layer;

[0035] An outer sheath, the outer sheath is flat and wraps the first reinforcement member;

[0036] A second reinforcement member, the second reinforcement member is symmetrically arranged inside the outer sheath with the optical fiber as the axis;

[0037] The suspension wire is connected to the outer sheath and is located above the outer sheath.

[0038] In the present invention, the optical fiber is an ultra-flexible optical fiber or an optical fiber bundle, and the number of the optical fibers can be one or more; the outer side of the optical fiber is preferably provided with a color coating. The outer diameter of the optical fiber is 160 μm to 265 μm, and can be 160 μm, 180 μm, 200 μm, 220 μm, 240 μm, 260 μm or 265 μm, etc. The above values ​​are only for enumeration and are not limited to this. Other point values ​​within the numerical range are applicable. To avoid complexity, they are not described one by one here.

[0039] In the utility model, the loose tube wraps the optical fiber, and the loose tube and the optical fiber are filled with fiber paste, which is a fiber paste involved in the prior art, which generally has a super-hydrophobic effect and has a certain viscoelasticity, plays a role in water blocking and protecting the optical fiber, and prevents water seepage of the optical cable. Wherein, the material of the loose tube can be polypropylene, polycarbonate or polybutylene terephthalate, which are all materials disclosed in the prior art.

[0040] In the utility model, a water blocking layer is arranged on the outside of the loose tube, and the water blocking layer is composed of a water blocking tape, and the water blocking tape is wound around the outside of the loose tube. The water blocking layer has the effect of rapid expansion after absorbing water, and is used to prevent water seepage in the horizontal and vertical directions of the optical cable. The thickness of the water blocking layer is 0.15-0.8 mm, preferably 0.2-0.6 mm, and more preferably 0.3-0.5 mm.

[0041] In the utility model, the optical cable further comprises a first reinforcement member, which is wound around the outer side of the water-blocking layer. The arrangement of the first reinforcement member enables the optical cable to have excellent anti-bite, anti-bird-pecking, anti-bird-gun, flame-retardant and typhoon-resistant capabilities.

[0042] In the present invention, the outer sheath is flat and is used to wrap the first reinforcement. The outer sheath is preferably a flame-retardant outer sheath, and its material is low-smoke halogen-free flame-retardant polyolefin. It should be noted that the low-smoke halogen-free flame-retardant polyolefin is not a new material, and it can be a substance disclosed in the prior art. In the present invention, if the reinforcement is selected from FRP fiberglass rods or high-strength FRP fiberglass rods that have been coated with glue or surface pretreated, the bonding ability between the sheath material (i.e., low-smoke halogen-free flame-retardant polyolefin) and FRP in the outer sheath can be enhanced, and the overall tensile strength of the optical cable can be improved. The outer sheath is generally formed by uniformly extruding the sheath material on the surface of the optical cable, which can provide the optical cable with excellent flame retardancy and fire resistance, prevent the flame from burning along the optical cable during use, and avoid the formation of secondary disasters.

[0043] In the utility model, the optical cable is further provided with a second reinforcement member, which is arranged in parallel inside the outer sheath, and the number of the second reinforcement members is preferably an even number, and is arranged symmetrically with the optical fiber as the axis. In some embodiments of the utility model, the number of the second reinforcement members is 4; among them, 2 reinforcement members are preferably longitudinally symmetrically distributed with the optical fiber as the axis, and the other 2 reinforcement members are preferably transversely symmetrically distributed with the optical fiber as the axis. The arrangement of the second reinforcement member enables the optical cable to have a better ability to resist lateral forces, and the use of rubber-coated steel wire, phosphating steel wire or galvanized steel wire can effectively enhance the tensile performance of the optical cable.

[0044] It should be noted that the first reinforcement and the second reinforcement are preferably any one of FRP glass fiber rods, rubber-coated steel wires, phosphated steel wires or galvanized steel wires, wherein the FRP glass fiber rods can be high-strength FRP glass fiber rods coated with rubber or surface pretreated. It should be noted that the above-mentioned FRP glass fiber rods (i.e., fiber-reinforced composite glass fiber rods), rubber-coated steel wires, phosphated steel wires or galvanized steel wires, and high-strength FRP glass fiber rods coated with rubber or surface pretreated are all materials disclosed in the prior art.

[0045] In the utility model, the suspension wire is connected to the outer sheath and is located above the outer sheath when in use. The suspension wire can be any one of FRP glass fiber rod, phosphated steel wire, rubber-coated steel wire, galvanized steel wire or steel stranded wire. The setting of the suspension wire can further increase the tensile strength of the optical cable.

[0046] In some preferred embodiments of the utility model, the outdoor overhead flame-retardant figure-eight optical cable also includes a metal armor layer, which is coated on the inner side of the loose tube to form an inner protective structure of the optical cable, thereby improving the overall protection capability of the overall optical cable. The material of the metal armor layer can be a steel belt or a stainless steel belt after tying, which are both materials disclosed in the prior art. At the same time, due to the presence of the water-blocking layer, water seepage of the optical cable can be prevented.

[0047] In some preferred embodiments of the utility model, the outdoor overhead flame-retardant figure-eight optical cable further includes a color strip, which is arranged below the outer sheath and can be composed of brightly colored polyethylene, polyvinyl chloride, and flame-retardant polyolefin, and is used to identify the appearance of the optical cable. Among them, polyethylene, polyvinyl chloride, and flame-retardant polyolefin are all substances disclosed in the prior art.

[0048] In a specific embodiment of the utility model, the cross-sectional schematic diagram of the outdoor overhead flame-retardant figure-eight optical cable is as follows Figure 1 As shown, including:

[0049] Optical fiber 10;

[0050] A loose tube 9, wherein the loose tube wraps the optical fiber 10, and a fiber paste 11 is filled between the loose tube and the optical fiber;

[0051] A metal armor layer 8, wherein the metal armor layer 8 is coated on the inner side of the loose tube 9;

[0052] A water-blocking layer 7, wherein the water-blocking layer 7 is coated on the outer side of the loose tube 9;

[0053] A first reinforcement member 4, wherein the first reinforcement member 4 is wound around the outer side of the water blocking layer 7;

[0054] An outer sheath 2, wherein the outer sheath 2 is flat and wraps the first reinforcement member 4;

[0055] Reinforcement member 3, reinforcement member 12, reinforcement member 5, reinforcement member 6, wherein reinforcement member 3 and reinforcement member 12 are preferably symmetrically distributed along the longitudinal direction of the loose tube, and reinforcement member 5 and reinforcement member 6 are preferably symmetrically distributed along the transverse direction of the loose tube;

[0056] A polymer layer 2, wherein the polymer layer 2 is disposed between the outer sheath 2 and the reinforcement 3, the reinforcement 12, the reinforcement 5, and the reinforcement 6;

[0057] A suspension wire 1, wherein the suspension wire 1 is connected to the outer sheath 2 and is located above the outer sheath 2;

[0058] A color strip 13 is provided below the outer sheath 2 .

[0059] In order to further illustrate the utility model, the following examples are used to explain the utility model in detail. The experimental raw materials used in the following examples of the utility model are all common commercial products.

[0060] Example 1

[0061] This embodiment provides an outdoor flame-retardant figure-eight optical cable, and its cross-sectional schematic diagram is as follows: Figure 1 As shown, including:

[0062] Optical fiber 10;

[0063] A loose tube 9, wherein the loose tube wraps the optical fiber 10, and a fiber paste 11 is filled between the loose tube and the optical fiber;

[0064] A metal armor layer 8, wherein the metal armor layer 8 is coated on the inner side of the loose tube 9;

[0065] A water-blocking layer 7, wherein the water-blocking layer 7 is coated on the outer side of the loose tube 9;

[0066] A first reinforcement member 4, wherein the first reinforcement member 4 is wound around the outer side of the water blocking layer 7;

[0067] An outer sheath 2, wherein the outer sheath 2 is flat and wraps the first reinforcement member 4;

[0068] The second reinforcement member 3, the second reinforcement member 12, the second reinforcement member 5, and the second reinforcement member 6, wherein the second reinforcement member 3 and the second reinforcement member 12 are preferably symmetrically distributed along the longitudinal direction of the loose tube, and the second reinforcement member 5 and the second reinforcement member 6 are preferably symmetrically distributed along the transverse direction of the loose tube;

[0069] A polymer layer 2, wherein the polymer layer 2 is disposed between the outer sheath 2 and the second reinforcement member 3, the second reinforcement member 12, the second reinforcement member 5, and the second reinforcement member 6;

[0070] A suspension wire 1, wherein the suspension wire 1 is connected to the outer sheath 2 and is located above the outer sheath 2;

[0071] A color strip 13 is provided below the outer sheath 2 .

[0072] Among them, the metal armor layer is composed of steel belts, the water-blocking layer is composed of water-blocking tapes, the first reinforcement is composed of galvanized steel wires, the second reinforcement is composed of non-metallic reinforcements, and the polymer layer is composed of flame-retardant polyolefin.

[0073] The flame retardant polyolefin is a flame retardant polyolefin disclosed in the prior art patent: "A halogen-free flame retardant polyolefin sheath material and its preparation method and application" application number: CN114058109A;

[0074] The specific preparation method is as follows:

[0075] ① The optical fiber, fiber paste and loose tube are extruded and formed simultaneously in the sheathing process; ② In the armoring process, after the loose tube is longitudinally wrapped with water-blocking tape and steel tape, the galvanized steel wire is twisted around the steel tape to form a shape; ③ In the sheathing process, the armored cable core and suspension wire are simultaneously passed through the extruder together with the first reinforcement (galvanized steel wire) and the second reinforcement (non-metallic reinforcement) to extrude a layer of flame-retardant polyolefin sheath material and color strips.

[0076] Performance Testing

[0077] (1) Tensile performance: Referring to the standard "Layer-twisted and filled outdoor optical cable for communication YD / T901-2018", the optical cable obtained in Example 1 meets the requirements of additional attenuation ≤0.01 dB under a tensile force of 6000 N / 10 min and a strain of no more than 0.01%.

[0078] (2) Flattening performance: Referring to the standard "Generic Requirements for Optical Fiber and Optical Fiber Cable-Telcordia Technologies Generic Requirements GR-20-CORE", the optical cable obtained in Example 1 meets the requirements of attenuation ≤ 0.15 dB and strain not greater than 0.4% under flattening at 4000 N / 10 min.

[0079] (3) Flame retardant properties: Referring to the standard "Tests on electric and optical fibre cables underfire conditions-Part 3-23:Test for vertical flame spread of vertically-mounted bunched wires or cables-Category B (IEC 60332-3-23:2018); German version EN IEC 60332-3-23:2018", the optical cable obtained in Example 1 meets the bundle B combustion, and the carbonization height is less than or equal to 2.0m.

[0080] (4) Optical cable transmittance: Referring to the standard "Measurement of smoke density of cables burning under defined conditions: Test apparatus (IEC 61034-1:2005), the optical cable obtained in Example 1 meets the light transmittance requirement of ≥ 65%.

[0081] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An outdoor overhead flame-retardant figure-eight optical cable, characterized in that: include: optical fiber; A loose tube, wherein the loose tube wraps the optical fiber, and a fiber paste is filled between the loose tube and the optical fiber; A water-blocking layer, the water-blocking layer is coated on the outside of the loose tube; A first reinforcement member, the first reinforcement member is wound around the outer side of the water blocking layer; An outer sheath, the outer sheath is flat and wraps the first reinforcement member; A second reinforcement member, the second reinforcement member is symmetrically arranged inside the outer sheath with the optical fiber as the axis; A suspension wire is connected to the outer sheath.

2. The outdoor overhead flame-retardant figure-eight optical cable according to claim 1, characterized in that: The water blocking layer is composed of a water blocking tape, and the water blocking tape is wound around the outside of the loose tube.

3. The outdoor overhead flame-retardant figure-eight optical cable according to claim 1 or 2, characterized in that: The thickness of the water-blocking layer is 0.15-0.8 mm.

4. The outdoor overhead flame-retardant figure-eight optical cable according to claim 1, characterized in that: The number of the second reinforcement members is 4; Among them, two reinforcement members are longitudinally symmetrically distributed with the optical fiber as the axis, and the other two reinforcement members are transversely symmetrically distributed with the optical fiber as the axis.

5. The outdoor overhead flame-retardant figure-eight optical cable according to claim 1, characterized in that: The outdoor overhead flame-retardant figure-eight optical cable also includes a metal armor layer; The metal armor layer is coated on the inner side of the loose tube.

6. The outdoor overhead flame-retardant figure-eight optical cable according to claim 1, characterized in that: The outer sheath is a flame retardant outer sheath.

7. The outdoor overhead flame-retardant figure-eight optical cable according to claim 1, characterized in that: The number of the optical fibers is one or more; The outer side of the optical fiber is provided with a color coating.

8. The outdoor overhead flame-retardant figure-eight optical cable according to claim 1 or 7, characterized in that: The outer diameter of the optical fiber is 160 μm to 265 μm.

9. The outdoor overhead flame-retardant figure-eight optical cable according to claim 1, characterized in that: The outdoor overhead flame-retardant figure-eight optical cable also includes a color strip; The color strip is arranged below the outer sheath.

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