An environmentally friendly highly flame-retardant optoelectronic composite cable

Abstract

The present invention relates to the field of power cable technology, and in particular to an environmentally friendly highly flame-retardant optoelectronic composite cable, comprising a cable core and a sheath layer coated on the outside of the cable core, wherein the cable core comprises a first non-metallic reinforcement member located in the center, two electrical units arranged around the non-metallic reinforcement member, a micro optical cable and a butterfly-shaped lead-in cable; wherein the two electrical units are symmetrically arranged on both sides of the first non-metallic reinforcement member, and the micro optical cable and the butterfly-shaped lead-in cable are located on both sides of the central connection line of the two electrical units; the sheath layer comprises a flame-retardant tape overlapped and wound around the outside of the cable core and a highly flame-retardant outer sheath wrapped around the outside of the flame-retardant tape. The optoelectronic composite cable of the present invention is not only small in size and light in weight, but also has higher laying flexibility and scene adaptability. At the same time, the use of environmentally friendly materials and non-metallic reinforcement members makes the optical cable more environmentally friendly and lightweight. Under the protection of the double-layer fire-retardant layer, it has good high temperature resistance and flame retardant properties, and can be applied to multiple complex combustion scenes indoors and outdoors.

Description

Technical Field

[0001] The invention relates to the technical field of power cables, and in particular to an environmentally friendly highly flame-retardant optoelectronic composite cable. Background Art

[0002] Optical-electric hybrid cables can provide signal and energy transmission at the same time, which not only effectively realizes equipment power consumption, broadband access and signal transmission, but also saves space and cost, improves transmission efficiency, and has become a very ideal 5G cable product. At present, 5G application areas include 5G fronthaul outdoor communication base stations, 5G base station indoor wireless distribution systems, 5G data centers, 5G mobile communications, etc.

[0003] However, the existing optoelectronic composite cables still have the following problems: 1. The fire resistance is poor. In a complex combustion environment, the outer sheath layer cannot effectively protect the cable core wrapped therein from fire. 2. The tensile and compressive resistance is poor, which is mainly reflected in the independent tensile and compressive resistance of the optical cable itself and the electrical unit and optical unit located therein, resulting in poor overall mechanical properties. 3. The existing optical cables are large in size and weight, which makes them inconvenient to lay flexibly. At the same time, the use of a single optical unit limits the application scenarios of the optical cables. Summary of the invention

[0004] In order to solve at least one of the above technical problems, the present invention proposes an environmentally friendly highly flame-retardant optoelectronic composite cable, which solves the problems of low transmission efficiency, heavy weight, low compression and tensile resistance, and environmental pollution in the burning state in electrical transmission and signal synchronous transmission in complex environments by introducing electrical units, micro optical cables and butterfly-shaped lead-in cables into the cable core, and sequentially arranging flame-retardant tapes and highly flame-retardant outer sheaths on the outside of the cable core.

[0005] To achieve the above object, the present invention adopts the following technical solution:

[0006] An environmentally friendly highly flame-retardant optoelectronic composite cable comprises a cable core and a sheath layer coated on the outside of the cable core, wherein the cable core comprises a first non-metallic reinforcement member located in the center, two electrical units arranged around the first non-metallic reinforcement member, a micro optical cable and a butterfly-shaped lead-in cable; wherein the two electrical units are symmetrically arranged on both sides of the first non-metallic reinforcement member, and the micro optical cable and the butterfly-shaped lead-in cable are located on both sides of a line connecting the centers of the two electrical units;

[0007] The sheath layer comprises a flame retardant tape which is overlapped and wound around the outside of the cable core and a highly flame retardant outer sheath which is wrapped around the outside of the flame retardant tape.

[0008] Preferably, the micro optical cable comprises a plurality of first optical fiber units and a dry sleeve sleeved outside the first optical fiber units, wherein the first optical fiber units comprise a plurality of first optical fibers wrapped in a curing resin.

[0009] Preferably, the number of the first optical fiber units is 5, and the arrangement manner thereof is: one of the first optical fiber units is taken as the center, and the other four first optical fiber units are arranged in a circular array on the periphery.

[0010] Preferably, the butterfly-shaped drop cable comprises a highly flame-retardant inner sheath, a second optical fiber unit located at the center of the highly flame-retardant inner sheath, and second non-metallic reinforcement members located at both sides of the highly flame-retardant inner sheath and arranged symmetrically relative to the second optical fiber unit.

[0011] Preferably, the second optical fiber unit comprises a third non-metallic reinforcement member located in the center and a plurality of second optical fibers arranged in an annular array around the third non-metallic reinforcement member.

[0012] Preferably, the cross-section of the highly flame-retardant inner sheath is a waist-hole type as a whole, and V-shaped grooves with staggered positions are provided on both sides of the rectangular section of the waist-hole type, and the V-shaped grooves are located in the second optical fiber unit and its extension area.

[0013] Preferably, a V-shaped insect repellent layer is arranged on the inner side of the bottom of the V-shaped groove, and the V-shaped insect repellent layer and the inner side of the V-shaped groove are filled with at least one insect repellent.

[0014] Preferably, an oxygen-isolating layer is formed on the surface of the flame-retardant tape by spraying oxygen-isolating powder.

[0015] Preferably, the highly flame retardant outer sheath and the highly flame retardant inner sheath are both made of polyethylene modified by a modifier, and the modifier includes nitrogen compounds and / or phosphorus compounds used as flame retardants, hydroxides and / or layered borates and / or nano flame retardants used as fillers, phosphates used as antioxidants, and insect repellents used to prevent insect bites.

[0016] Preferably, the flame retardant belt is made of PET, the first non-metallic reinforcement is made of FRP, the second non-metallic reinforcement and the third non-metallic reinforcement are made of aramid FRP, the dry sleeve is made of silicone or high temperature resistant plastic, and the insulating layer is made of silicone rubber.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present invention arranges electrical units, micro optical cables and butterfly-shaped lead-in cables around the first non-metallic reinforcement. Since the micro optical cable has a small diameter and good flexibility, and the butterfly-shaped lead-in cable has a large bandwidth and transmission distance, the optoelectronic composite cable is not only small in size and light in weight, but also has higher laying flexibility and scene adaptability. At the same time, the first non-metallic reinforcement is arranged in the center, so that the optoelectronic composite cable has good tensile resistance and insulation. At the same time, the optoelectronic composite cable is also more environmentally friendly and lightweight. By arranging a flame retardant tape and a highly flame retardant outer sheath on the outside of the cable core, the optoelectronic composite cable has good high temperature resistance and flame retardant properties, and can be used in multiple complex combustion scenes indoors and outdoors. At the same time, the flame retardant tape and the highly flame retardant outer sheath can form a carbonized isolation layer and a carbonized layer when burning, blocking the circulation of air inside and outside, forming an oxygen and heat insulation effect, and then protecting the cable core located therein.

[0019] 2. The present invention sets staggered V-shaped grooves on both sides of the butterfly-shaped lead-in cable. Since the bottom of the V-shaped groove has a sharp angle and a small angle, the bottom space is small, making it difficult for biting insects such as ants to bite the optical cable. In addition, compared with the grooves of traditional butterfly cables that are mostly opened at the same height as the optical fiber, the V-shaped grooves in the present invention avoid the position of the central second optical fiber unit and are staggered. This can effectively prevent biting insects from biting through the bottom of the V-shaped groove and then biting the second optical fiber unit at the same height.

[0020] 3. The highly flame-retardant outer sheath and the highly flame-retardant inner sheath in the present invention are both made of modified polyethylene materials, so that at the beginning of combustion, the highly flame-retardant outer sheath and the highly flame-retardant inner sheath can form a flame-retardant layer on their own surface; during the combustion process, they release water vapor and / or inert gas to delay or weaken the combustion; after combustion, they form a variety of isolation layers to block the circulation of air inside and outside, avoiding the protection of the cable core inside. At the same time, the flame-retardant belt will also form a carbonized isolation layer after combustion, and the isolation layer generated by the combustion of the outer highly flame-retardant outer sheath forms a double-layer isolation, further preventing the continuation of combustion and effectively protecting the internal cable core.

[0021] 4. The highly flame-retardant outer sheath, highly flame-retardant inner sheath and flame-retardant belt of the present invention are all made of materials that do not contain halogen elements, so that they produce less smoke when burned and do not release halogen compounds, reducing the impact on the environment and human health, and are therefore more environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of an environmentally friendly highly flame-retardant optoelectronic composite cable;

[0023] Figure 2 It is a schematic diagram of the structure of the micro optical cable in the present invention;

[0024] Figure 3It is a structural schematic diagram of the butterfly-shaped drop cable in the present invention;

[0025] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0026] In the figure: 1. first non-metallic reinforcement; 2. electrical unit; 21. feeder; 22. insulation layer; 3. micro optical cable; 31. first optical fiber unit; 311. curing resin; 312. first optical fiber; 32. dry sleeve; 4. butterfly-shaped lead-in cable; 41. highly flame-retardant inner sheath; 411. V-shaped groove; 412. insect repellent layer; 42. second optical fiber unit; 421. third non-metallic reinforcement; 422. second optical fiber; 43. second non-metallic reinforcement; 5. flame-retardant tape; 6. highly flame-retardant outer sheath. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. It is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments of the present invention.

[0028] Please refer to Figure 1-4 As shown, an environmentally friendly highly flame-retardant optoelectronic composite cable comprises a cable core and a sheath layer coated on the outside of the cable core, wherein the cable core comprises a first non-metallic reinforcement member 1 located in the center, two electrical units 2 arranged around the first non-metallic reinforcement member 1, a micro optical cable 3 and a butterfly-shaped lead-in cable 4; wherein the two electrical units 2 are symmetrically arranged on both sides of the first non-metallic reinforcement member 1, and the micro optical cable 3 and the butterfly-shaped lead-in cable 4 are located on both sides of the center line connecting the two electrical units 2; the sheath layer comprises a flame-retardant tape 5 overlapped and wound around the outside of the cable core and a highly flame-retardant outer sheath 6 wrapped around the outside of the flame-retardant tape 5.

[0029] In this embodiment, the electrical unit 2, the micro optical cable 3 and the butterfly-shaped lead-in cable 4 are used to make the optoelectronic composite cable have the functions of both electrical transmission and signal transmission. At the same time, the micro optical cable 3 has a small diameter and good flexibility, while the butterfly-shaped lead-in cable 4 has a large bandwidth and transmission distance, so that the optoelectronic composite cable is not only small in size and light in weight, but also has higher laying flexibility and scene adaptability. By arranging the first non-metallic reinforcement 1 in the center, the optoelectronic composite cable has good tensile resistance and insulation, and the optoelectronic composite cable is also more environmentally friendly and lightweight. By arranging a flame retardant tape 5 and a highly flame retardant outer sheath 6 on the outside of the cable core, the optoelectronic composite cable has good high temperature resistance and flame retardant properties, and can be used in multiple complex combustion scenes indoors and outdoors.

[0030] In addition, since the materials of the optoelectronic composite cable are all dry materials, compared with the composite cable with grease, the optoelectronic composite cable in this embodiment effectively avoids the pollution of grease, and at the same time, reduces the process of cleaning it after later use. Therefore, the optoelectronic composite cable has good environmental performance.

[0031] Please refer to Figure 2 As shown, the micro optical cable 3 includes a plurality of first optical fiber units 31 and a dry sleeve 32 sleeved outside the first optical fiber units 31 . The first optical fiber units 31 include a plurality of first optical fibers 312 wrapped in a curing resin 311 .

[0032] Specifically, the number of first optical fibers 312 in the first optical fiber unit 31 can be determined according to actual transmission needs to meet the laying requirements of particularly complex paths for high-density wiring.

[0033] In this embodiment, the number of first optical fiber units 31 is 5, and the arrangement is as follows: one of the first optical fiber units 31 is the center, and the other four first optical fiber units 31 are arranged in a circular array on the periphery. At the same time, the number of first optical fibers 312 in each first optical fiber unit 31 can also be determined as needed. In this embodiment, the first optical fiber unit 31 is composed of 4 first optical fibers 312.

[0034] The function of the dry sleeve 32 is to protect the optical cable from damage when a fire occurs and the outer highly flame-retardant outer sheath 6 and the flame-retardant tape 5 are damaged, ensuring that the optical cable can continue to maintain stable signal transmission for a certain period of time under high temperature or burning conditions, and having the function of inner layer fire protection, thereby improving the overall reliability of the optoelectronic composite cable.

[0035] It should be noted that the dry type casing 32 may be made of the following materials:

[0036] Silicone: Silicone is a high-temperature fire-resistant material with good high-temperature resistance and flame retardancy. It is suitable for use as a fire-resistant protective sheath material for optical cables.

[0037] High temperature resistant plastics: Some special high temperature plastics, such as fluoroplastics (such as polytetrafluoroethylene PTFE), have excellent high temperature resistance and flame retardant properties.

[0038] Metal (such as steel or aluminum alloy): In some environments with particularly high requirements, fire-resistant sleeves made of metal can also be used. These sleeves can provide higher mechanical strength and fire resistance.

[0039] Considering the environmental friendliness and light weight of the optoelectronic composite cable, the present embodiment preferably uses silicone or high temperature resistant plastic, wherein the dry sleeve 32 is made of silicone or high temperature resistant plastic.

[0040] Please refer to Figure 3As shown, the butterfly-shaped drop cable 4 includes a highly flame-retardant inner sheath 41 , a second optical fiber unit 42 located at the center of the highly flame-retardant inner sheath 41 , and second non-metallic reinforcement members 43 located on both sides of the highly flame-retardant inner sheath 41 and symmetrically arranged relative to the second optical fiber unit 42 .

[0041] It should be noted that the function of the above-mentioned highly flame-retardant inner sheath 41 is that when the highly flame-retardant outer sheath 6 and the flame-retardant tape 5 located on the outer layer are damaged in a high temperature or combustion environment, the high-temperature flame-retardant inner sheath can provide high-temperature and combustion-resistant protection to the second optical fiber unit 42 located therein, so that the butterfly-type introduction cable 4 can still maintain the signal transmission function for a certain period of time under a high-temperature combustion state, that is, the butterfly-type introduction cable 4 itself has an inner layer flame-retardant function.

[0042] In this embodiment, a symmetrical second non-metallic reinforcement 43 is provided on the butterfly-shaped lead-in cable 4. Compared with the optical cable with reinforcement added only in the center, the butterfly-shaped lead-in cable 4 has better mechanical strength as a whole, so that it can withstand greater external tension and pressure, and effectively protect the second optical fiber unit 42 located in the center. Compared with traditional metal reinforcements, the use of reinforcements made of non-metallic materials can make the butterfly-shaped lead-in cable 4 more lightweight, which is particularly beneficial for mobile communication equipment or other scenarios that require lightweight optical cables. At the same time, since the reinforcements made of non-metallic materials are non-conductive, they can reduce the risk of electromagnetic interference to a certain extent, thereby improving the stability and reliability of signal transmission of the butterfly-shaped lead-in cable 4. Compared with metal reinforcements, non-metallic reinforcements are softer and easier to bend, making the butterfly-shaped lead-in cable 4 easy to install and maintain. At the same time, they are not easy to rust or corrode, thereby extending the service life of the butterfly-shaped lead-in cable 4.

[0043] In this embodiment, the second optical fiber unit 42 includes a third non-metallic reinforcement member 421 located in the center and a plurality of second optical fibers 422 arranged in an annular array around the third non-metallic reinforcement member 421 .

[0044] It can be understood that, since the third non-metallic reinforcement 421 is located at the center of the butterfly-shaped drop cable 4, it cooperates with the second non-metallic reinforcements 43 on both sides to further improve the overall tensile and compressive resistance of the butterfly-shaped drop cable 4. In this embodiment, the first non-metallic reinforcement 1 is preferably made of FRP, and the second non-metallic reinforcement 43 and the third non-metallic reinforcement 421 are preferably made of aramid FRP.

[0045] In this embodiment, four second optical fibers 422 are arranged in a circular array around the third non-metallic reinforcement member 421 . Obviously, the number of the second optical fibers 422 can be adaptively adjusted according to actual signal transmission requirements.

[0046] Please continue to refer to Figure 3In this embodiment, the cross-section of the highly flame-retardant inner sheath 41 is a waist-shaped hole as a whole, and V-shaped grooves 411 with staggered positions are opened on both sides of the waist-shaped rectangular section. The V-shaped grooves 411 are located in the second optical fiber unit 42 and its extension area.

[0047] It should be noted that since the environment in which optical cables are laid will inevitably have ants and other insects with biting abilities, they can easily bite the optical cables or enter the cables through the gaps in the cables and bite their internal structures, which can easily damage the cables and affect the signal transmission quality of the cables.

[0048] In this embodiment, V-shaped grooves 411 are arranged on both sides of the highly flame-retardant inner sheath 41. Due to the sharp acute angle at the bottom of the V-shaped groove 411, the angle is small, resulting in a small bottom space, making it difficult for biting insects such as ants to bite the optical cable. In addition, compared with the grooves of the traditional butterfly cable, which are mostly opened at the same height position of the optical fiber, the V-shaped groove 411 in this embodiment avoids the position of the central second optical fiber unit 42 and adopts a staggered opening form. Specifically, the V-shaped grooves 411 are respectively opened on both sides of the rectangular section of the waist-shaped hole, one of the V-shaped grooves 411 is located at the upper part of one side of the rectangular section, and the other V-shaped groove 411 is located at the lower part of one side of the rectangular section. At the same time, both of the two V-shaped grooves 411 avoid the area where the second optical fiber unit 42 is located, including its lateral extension area. As a result, it can be effectively prevented that biting insects once bite through the bottom of the V-shaped groove 411, and then bite the second optical fiber unit 42 located at the same height.

[0049] In addition, when the butterfly cable 4 is subjected to pressure, the V-shaped grooves 411 that are staggered absorb part of the energy, thereby dispersing the pressure and buffering the butterfly cable 4, effectively protecting the second optical fiber unit 42 wrapped in the center of the butterfly cable 4 from the impact of pressure.

[0050] like Figure 4 As shown, a V-shaped insect repellent layer 412 is disposed inside the bottom of the V-shaped groove 411, and at least one insect repellent is filled in the V-shaped insect repellent layer 412 and the inside of the V-shaped groove 411. The insect repellent is preferably in powder form.

[0051] It should be noted that the V-shaped structure of the above-mentioned V-shaped insect repellent layer 412 also has the same function as the above-mentioned V-shaped groove 411 to avoid damage by biting insects. When the V-shaped insect repellent layer 412 is bitten, the smell of the insect repellent filled inside it will be emitted in a relatively closed space, thereby repelling the biting insects. Considering that the insect repellent in the bitten V-shaped insect repellent layer 412 will weaken or lose its insect repellent effect after long-term emission, the V-shaped insect repellent layer 412 in this embodiment can be arranged into several relatively independent and continuous parts. This avoids the V-shaped insect repellent layer 412 from losing its insect repellent effect as a whole after a certain section of the V-shaped insect repellent layer 412 is bitten.

[0052] The electric unit 2 in this embodiment includes a feeder 21 and an insulating layer 22 wrapped around the feeder 21 to improve flame retardancy and insulation. The insulating layer 22 may be made of silicone rubber.

[0053] In order to improve the flame retardant effect of the highly flame retardant outer sheath 6 and the highly flame retardant inner sheath 41, in this embodiment, the highly flame retardant outer sheath 6 and the highly flame retardant inner sheath 41 are made of polyethylene modified by a modifier. The modifier mainly includes nitrogen compounds and / or phosphorus compounds used as flame retardants, hydroxides and / or layered borates and / or nano flame retardants used as fillers, phosphates used as antioxidants, and insect repellents used to prevent rats or insects from biting.

[0054] The flame retardant principle of the above modifier is as follows:

[0055] Specifically, nitrogen flame retardant compounds refer to compounds with flame retardant properties, which contain nitrogen in their molecular structure. Nitrogen is released under high-temperature combustion conditions to form an inert atmosphere, thereby reducing or preventing the spread of flames. The specific components can be nitrile compounds (nitrile es) or amino compounds (amines) or other types of nitrogen compounds.

[0056] Phosphorus compounds mainly form a protective layer of phosphorus compounds on the surface of solids, which can isolate the direct effects of oxygen and combustion products on solids, slow down the thermal decomposition rate of solids, and prolong the combustion process. Or by promoting carbonization reaction, the carbon generated in the combustion is fixed as non-combustible charcoal, thereby preventing the further spread of fire. In this embodiment, the phosphorus compound can be a nitrogen phosphate or a phosphorus-nitrogen heterocyclic compound. Tripolyphosphate (TPP) is preferred.

[0057] Hydroxide mainly releases water vapor at high temperature, which helps slow down the combustion speed and inhibit the spread of flame. In this embodiment, the hydroxide can be aluminum hydroxide and / or magnesium hydroxide. It can release crystallized water vapor when burning at high temperature, which plays a role in cooling the combustion. Moreover, after combustion, aluminum oxide or magnesium oxide hard shell is formed, thereby forming an isolation layer, thereby preventing the continuation of combustion.

[0058] As an effective inorganic flame retardant, layered borates can release water vapor and stable borides at high temperatures, thereby reducing the burning rate and heat release rate of optical cables in fires. At the same time, layered borates have good mechanical reinforcement effects, which can increase the tensile strength and wear resistance of optical cable sheaths, and improve the service life and reliability of optical cables.

[0059] Nano-level flame retardant usually refers to materials with nano-level particles or nano-structures. Its special surface properties and size effects can effectively reduce the combustion performance of the material while enhancing other performance indicators of the optical cable.

[0060] Specifically, nano-scale particles can form a uniform flame retardant layer when the optical cable is heated, blocking the flame and high temperature from damaging the optical fiber, thereby protecting the optical fiber from being burned or damaged. At the same time, nano flame retardants can form a uniform support network in the structure of the optical cable, allowing the optical cable to withstand greater tension and pressure without breaking or being damaged. In addition, they can also reduce the fatigue and stress concentration of the optical fiber during long-term use, and improve the reliability and stability of the optical cable.

[0061] In addition, the uniform distribution of nanofillers can keep the optical fiber inside the cable in a relatively stable position and state, reducing the slight movement and bending of the optical fiber, thereby reducing the loss of optical signals and improving the transmission efficiency and performance of the optical cable.

[0062] The selection of nano flame retardants can be adjusted according to the specific requirements of the optical cable and the use environment to achieve the best fire protection and functional performance. Usually nanoparticles or nanostructured materials, such as nano alumina, nano silica, etc.

[0063] Therefore, the highly flame-retardant outer sheath 6 made of modified polyethylene material in this embodiment can provide sufficient flame retardancy in a combustion environment. When the flame retardancy is exceeded, it releases water vapor and / or inert gas to delay or weaken the combustion, and forms multiple isolation layers after combustion to protect the cable core inside it.

[0064] In order to form an oxygen-isolating effect on the highly flame-retardant outer sheath 6 and the flame-retardant tape 5, in this embodiment, an oxygen-isolating layer is formed by spraying oxygen-isolating powder on the surface of the cable core, and the flame-retardant tape 5 is made of PET.

[0065] It is understandable that the flame retardant tape 5 is used outside the cable core and has oxygen-isolating powder on the surface, and the oxygen-isolating and heat-isolating effect between the cable core and the sheath is achieved by reducing the oxygen concentration during the combustion of the highly flame-retardant outer sheath 6. At the same time, the flame retardant tape 5 forms a carbonized isolation layer during the combustion process, and the isolation layer generated after the highly flame-retardant outer sheath 6 is burned forms a double isolation layer, which effectively blocks the flow of air inside and outside and prevents the spread of flames.

[0066] The present invention arranges the electrical unit 2, the micro optical cable 3 and the butterfly-shaped lead-in cable 4 on the side of the first non-metallic reinforcement 1. Since the micro optical cable 3 has a small diameter and good flexibility, and the butterfly-shaped lead-in cable 4 has a large bandwidth and transmission distance, the optoelectronic composite cable is not only small in size and light in weight, but also has higher laying flexibility and scene adaptability. At the same time, the first non-metallic reinforcement 1 is arranged in the center, so that the optoelectronic composite cable has good tensile resistance and insulation. At the same time, the optoelectronic composite cable is also more environmentally friendly and lightweight. By arranging the flame retardant tape 5 and the high flame retardant outer sheath 6 on the outside of the cable core, the optoelectronic composite cable has good high temperature resistance and flame retardant properties, and can be applied to multiple complex combustion scenes indoors and outdoors. At the same time, the flame retardant tape 5 and the high flame retardant outer sheath 6 can form a carbonized isolation layer and a carbonized layer when burning, blocking the circulation of air inside and outside, forming an oxygen isolation and heat insulation effect, and then protecting the cable core located inside.

[0067] The above is a specific implementation of the embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of this application.

Claims

1. An environmentally friendly highly flame-retardant optoelectronic composite cable, comprising a cable core and a sheath layer coated on the outside of the cable core, characterized in that: The cable core comprises a first non-metallic reinforcement member (1) located at the center, two electrical units (2) arranged around the first non-metallic reinforcement member (1), a micro optical cable (3) and a butterfly-shaped lead-in cable (4); wherein the two electrical units (2) are symmetrically arranged on both sides of the first non-metallic reinforcement member (1), and the micro optical cable (3) and the butterfly-shaped lead-in cable (4) are located on both sides of a center line connecting the two electrical units (2); The sheath layer comprises a flame retardant tape (5) overlapped and wound around the outside of the cable core, and a highly flame retardant outer sheath (6) wrapped around the outside of the flame retardant tape (5), wherein the highly flame retardant outer sheath (6) is made of polyethylene modified by a modifier, and an oxygen-isolating layer is formed on the surface of the flame retardant tape (5) by spraying oxygen-isolating powder; The butterfly-shaped drop cable (4) comprises a highly flame-retardant inner sheath (41), a second optical fiber unit (42) located at the center of the highly flame-retardant inner sheath (41), and second non-metallic reinforcement members (43) located on both sides of the highly flame-retardant inner sheath (41) and arranged symmetrically relative to the second optical fiber unit (42); The cross-section of the highly flame-retardant inner sheath (41) is of a waist-shaped hole shape as a whole; V-shaped grooves (411) at staggered positions are provided on both sides of the rectangular section of the waist-shaped hole; the V-shaped grooves (411) are located in the second optical fiber unit (42) and its extension area; a V-shaped insect repellent layer (412) is provided on the inner side of the bottom of the V-shaped groove (411); the V-shaped insect repellent layer (412) and the inner side of the V-shaped groove (411) are filled with at least one insect repellent; and the V-shaped insect repellent layer (412) is provided in a plurality of relatively independent and continuous parts.

2. The environmentally friendly highly flame-retardant optoelectronic composite cable according to claim 1, characterized in that: The micro optical cable (3) comprises a plurality of first optical fiber units (31) and a dry sleeve (32) sleeved outside the first optical fiber units (31), wherein the first optical fiber units (31) comprise a plurality of first optical fibers (312) wrapped in a curing resin (311).

3. The environmentally friendly highly flame-retardant optoelectronic composite cable according to claim 2, characterized in that: The number of the first optical fiber units (31) is five, and their arrangement is as follows: one of the first optical fiber units (31) is taken as the center, and the other four first optical fiber units (31) are arranged in a circular array on the periphery.

4. The environmentally friendly highly flame-retardant optoelectronic composite cable according to claim 2, characterized in that: The second optical fiber unit (42) comprises a third non-metallic reinforcement member (421) located in the center and a plurality of second optical fibers (422) arranged in an annular array around the third non-metallic reinforcement member (421).

5. The environmentally friendly highly flame-retardant optoelectronic composite cable according to claim 1, characterized in that: The material of the highly flame-retardant inner sheath (41) is polyethylene modified by a modifier, wherein the modifier includes nitrogen compounds and / or phosphorus compounds used as flame retardants, hydroxides and / or layered borates and / or nano flame retardants used as fillers, phosphates used as antioxidants, and insect repellents used to prevent insect bites.

6. The environmentally friendly highly flame-retardant optoelectronic composite cable according to claim 4, characterized in that: The flame retardant tape (5) is made of PET, the first non-metallic reinforcement (1) is made of FRP, the second non-metallic reinforcement (43) and the third non-metallic reinforcement (421) are made of aramid FRP, and the dry sleeve (32) is made of silicone or high temperature resistant plastic.

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