Building monitoring thermo-sensitive photoelectric hybrid cable and preparation method thereof

Abstract

The invention discloses a building monitoring thermo-sensitive photoelectric hybrid cable and a preparation method thereof, the hybrid cable comprises an outer protective layer, a waterproof layer and a cable core which are sequentially arranged from outside to inside, and the cable core comprises at least one conductor unit, at least one signal transmission optical fiber unit and at least one temperature sensing optical fiber unit. The conductor unit, the signal transmission optical fiber unit and the temperature sensing optical fiber unit are compounded, optical signal and electric energy transmission can be achieved at the same time, the temperature abnormal position can be positioned through the temperature sensing optical fiber, later-period timely maintenance is facilitated, fire disasters and other safety accidents are avoided, a center reinforcing piece is not adopted, and cost is reduced. By filling the non-metal aramid fiber bundles which continuously and tightly wrap the units in the gaps of the cable cores, the tensile property of the hybrid cable can be improved, the effects of buffering and absorbing mechanical stress can be achieved, the overall size is small, the flexibility is good, the wiring distance can be prolonged, and the hybrid cable is suitable for long-distance wiring between buildings and sensitive monitoring scenes.

Description

Technical Field

[0001] This invention belongs to the field of optical cable technology, specifically relating to a building monitoring heat-sensitive optoelectronic hybrid cable and its preparation method. Background Technology

[0002] Traditional building monitoring cables consist of only electrical and optical transmission components and lack temperature sensing units. In the current environment of continuously advancing smart buildings and digital communities, they cannot achieve intelligent linkage control, nor can they monitor abnormal information in the transmission line in real time and provide alarms. Maintenance and inspection are time-consuming and labor-intensive. Summary of the Invention

[0003] To address the technical problems existing in the prior art, the present invention aims to provide a building monitoring heat-sensitive optoelectronic hybrid cable and its preparation method.

[0004] To achieve the above objectives and technical effects, the technical solution adopted by this invention is as follows: A building monitoring heat-sensitive optical-electric hybrid cable includes an outer sheath, a water-blocking layer, and a cable core arranged sequentially from the outside to the inside. The cable core includes at least one conductor unit, at least one signal transmission optical fiber unit, and at least one temperature-sensing optical fiber unit.

[0005] Furthermore, the gaps in the cable core are filled with non-metallic aramid fiber bundles that continuously and tightly wrap the conductor unit, signal transmission fiber unit, and temperature sensing fiber unit, with a filling density of 60%-80% and the fiber orientation is wound at a helical angle of 5°-20° with the cable core axis.

[0006] Furthermore, there are two conductor units, one signal transmission fiber optic unit, and one temperature sensing fiber optic unit, which are symmetrically arranged on the upper and lower sides of the conductor unit.

[0007] Furthermore, the conductor unit includes an insulating layer and a plurality of copper conductors encased therein, wherein the insulating layer is made of cross-linked polyethylene and the copper conductors are tin-plated copper conductors.

[0008] Furthermore, the signal transmission optical fiber unit includes a signal transmission optical fiber and a protective layer covering its outer side.

[0009] Furthermore, the temperature-sensing optical fiber unit includes a temperature-sensing optical fiber and a heat conduction-enhanced protective layer covering its outer side. The heat conduction-enhanced protective layer is prepared by resin and nano-aluminum nitride particles and nano-tungsten oxide particles, and the particle sizes of the nano-aluminum nitride particles and nano-tungsten oxide particles are 2-15μm, respectively.

[0010] Furthermore, the raw materials for preparing the outer protective layer include the following components in parts by weight: 50-70 parts of hydrogenated nitrile butadiene rubber 30-50 parts of chlorosulfonated polyethylene 30-50 parts of core-shell flame retardant 5-10 parts of carbon nanotubes 2-8 parts of zinc oxide nanocrystals Functional additives 1-10 parts.

[0011] Furthermore, the core-shell flame retardant is prepared by reacting triazine compound cyanurate, ammonium polyphosphate, and aminated mesoporous SiO2, wherein the aminated mesoporous SiO2 has a pore size of 8-15 nm and a specific surface area of ​​500-700 m². 2 / g.

[0012] Furthermore, the functional additive is at least one of silane coupling agents, UV oxidants, and anti-aging agents.

[0013] This invention also discloses a method for preparing a building monitoring heat-sensitive optoelectronic hybrid cable, comprising the following steps: 1) Fabrication of conductor units, signal transmission fiber optic units, and temperature sensing fiber optic units; 2) Cable making: The conductor unit, signal transmission fiber unit and temperature sensing fiber unit are arranged as required. The gaps between the cable cores are filled with non-metallic aramid fiber bundles that continuously and tightly wrap the conductor unit, signal transmission fiber unit and temperature sensing fiber unit. The filling density is 60%-80% and the fiber direction is wound at a spiral angle of 5°-20° with the cable core axis. The cable making direction is right-handed. 3) Water-blocking layer: Double-sided co-extruded water-blocking tape is wrapped around the outside of the cable core. Hot melt adhesive is coated on the inside of the double-sided co-extruded water-blocking tape. When the cable core is cabled, the hot melt adhesive penetrates into the gaps of the non-metallic aramid fiber bundles. 4) Extruded outer sheath: An outer sheath is extruded on the outside of the water-blocking layer to form the required building monitoring heat-sensitive optical-electric hybrid cable.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) By combining conductor unit, signal transmission fiber unit and temperature sensing fiber unit, construction can be completed in one wiring, which is simple and fast. It can also realize the transmission of optical signals and electrical energy at the same time, which broadens the application field of optical cable. The temperature sensing fiber can locate the location of abnormal temperature, which is convenient for timely maintenance later, avoiding safety accidents such as fire, and meeting the safety requirements of wiring between buildings. (2) The temperature sensing fiber can be used with a distributed fiber optic temperature measurement host to accurately locate the abnormal temperature location, which is convenient for maintenance. The alarm information can be linked to the cable section to simultaneously cut off the power transmission and ensure safety. (3) Without using a central reinforcing member, by filling the gap between the cable cores with continuous and tightly wrapped non-metallic aramid fiber bundles, the tensile strength of the hybrid cable can be improved. At the same time, it can also buffer and absorb mechanical stress, enhance the mechanical properties of the hybrid cable, extend the wiring distance, and is suitable for long-distance wiring between buildings. Since it is completely non-metallic, electromagnetic interference is avoided, making it more suitable for sensitive monitoring scenarios. (4) It has a small overall size and good flexibility, which can extend the wiring distance. It is suitable for long-distance wiring between buildings and is suitable for sensitive monitoring scenarios. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention. Detailed Implementation

[0016] The present invention will now be described in detail so that its advantages and features can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0017] The following provides a brief overview of one or more aspects to offer a basic understanding of them. This overview is not an exhaustive summary of all conceived aspects, nor is it intended to identify key or decisive elements of all aspects, nor to define the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form to prepare for the more detailed descriptions that follow.

[0018] like Figure 1 As shown, this invention discloses a building monitoring heat-sensitive optical-electric hybrid cable, comprising an outer sheath 1, a water-blocking layer 2, and a cable core arranged sequentially from the outside to the inside. The cable core includes several conductor units, signal transmission optical fiber units, and temperature-sensing optical fiber units. The gaps between the cable cores are filled with continuous and tightly wrapped non-metallic aramid fiber bundles 3, with a filling density of 60%-80% and the fibers wound at a helical angle of 5°-20° with the cable core axis. This improves the tensile strength of the hybrid cable and also acts as a buffer, absorbing mechanical stress, extending the cabling distance. It is suitable for long-distance cabling between buildings. Because it is completely non-metallic, electromagnetic interference is avoided, making it more suitable for sensitive monitoring scenarios.

[0019] The outer sheath 1 can be made of conventional flame-retardant sheath material and extruded onto the water-blocking layer 2 using a conventional extrusion process. Alternatively, the outer sheath 1 can be manufactured in-house, depending on the customer's R&D capabilities and specific circumstances. If the latter is chosen, the raw materials for preparing the outer sheath 1 include the following components in parts by weight: 50-70 parts of hydrogenated nitrile butadiene rubber 30-50 parts of chlorosulfonated polyethylene 30-50 parts of core-shell flame retardant 5-10 parts of carbon nanotubes 2-8 parts of zinc oxide nanocrystals Functional additives 1-10 parts.

[0020] Core-shell flame retardants are flame retardants prepared by reacting triazine compound cyanurate, ammonium polyphosphate, and aminated mesoporous SiO2. The aminated mesoporous SiO2 has a pore size of 8-15 nm and a specific surface area of ​​500-700 m² / g. 2 / g, triazine compound cyanurate and ammonium polyphosphate were prepared by the following steps at a molar ratio of 1:1-4: First, the mesoporous silica microspheres are hydroxylated. Hydroxyl groups can be modified on the silica surface using conventional wet chemical methods or vapor deposition. Then, amino groups are modified on the silica surface using conventional silane coupling agent methods or graft polymerization methods. Finally, centrifugation washing and vacuum drying (80℃, 24h) are performed to obtain the desired aminated mesoporous SiO2.

[0021] Core-shell flame retardants are prepared using the following steps: In a supercritical CO2 reactor at 12-16 MPa and 30-40℃, aminated mesoporous SiO2 and triazine compound cyanurate are mixed and held under pressure for 1-2 hours to promote the infiltration of triazine compound cyanurate into the mesopores. The pressure is then reduced to 6-8 MPa, and ammonium polyphosphate and sodium citrate are added. The temperature is raised to 55-65℃ and held under pressure for 1-3 hours to promote the eutectic formation of triazine compound cyanurate and ammonium polyphosphate in the mesopores. The pressure is released, the mixture is centrifuged, and dried to obtain the precursor. The eutectic formation is further promoted by adding sodium citrate. The precursor is then dispersed in an ethanol-water solution, and 0.1-0.3 mol / L hydrochloric acid is added to adjust the pH to 2-3. Ethyl orthosilicate (8% of the precursor weight) is then added, and the mixture is stirred at 50-70℃ for 2-4 hours. Finally, the mixture is centrifuged and washed, and then heat-treated at 110-130℃ for 1-5 hours in an ammonia atmosphere (non-air).

[0022] The functional additive is at least one of silane coupling agents, UV oxidants, and anti-aging agents.

[0023] Mix 50-70 parts of hydrogenated nitrile rubber, 30-50 parts of chlorosulfonated polyethylene, 5-10 parts of carbon nanotubes, and 1-10 parts of functional additives. Then add 30-50 parts of core-shell flame retardant and 2-8 parts of zinc oxide nanocrystals. Mix for 10-20 minutes at a temperature of 100-200℃ and a speed of 30-50 rpm. Then add the mixture to a twin-screw extruder and melt-extrude it onto the outside of the water-blocking layer 2. Cool down and cure to form the outer protective layer 1.

[0024] The water-blocking layer 2 is a double-sided co-extruded water-blocking tape, with hot melt adhesive coated on its inner side. When the cable core is stranded, the hot melt adhesive penetrates into the gaps of the non-metallic aramid fiber bundles 3 to form a three-dimensional water-blocking structure, preventing water from entering the mixed cable and ensuring stable and safe transmission of optical signals and electrical energy.

[0025] The conductor unit includes an insulating layer 4 and several copper conductors 5 encased within it. The insulating layer 4 is made of cross-linked polyethylene (XLPE). The use of XLPE transforms the linear structure of the polyethylene molecules into a three-dimensional network structure, significantly improving the conductor unit's overall performance, including mechanical properties, heat resistance, environmental stress cracking resistance, chemical corrosion resistance, creep resistance, electrical properties, and temperature rating. It also significantly enhances the current-carrying capacity of the copper conductors. The copper conductors 5 are tin-plated. Tin plating improves the oxidation resistance and heat dissipation of the copper conductors 5, prevents adhesion between the copper conductors 5 and the insulating layer 4, thus preventing the core from turning black and becoming brittle. It also improves weldability and conductivity, effectively extending the service life.

[0026] Signal transmission fiber optic units and temperature sensing fiber optic units are respectively installed on the upper and lower sides of the conductor unit.

[0027] The signal transmission fiber unit includes a signal transmission fiber 6 and a protective layer 7 covering its outer side. The protective layer 7 uses low-smoke halogen-free LSZH and has a thickness of 0.1-0.4 mm.

[0028] The temperature-sensing fiber unit includes a temperature-sensing fiber 8 and a heat-conductivity-enhanced protective layer 9 covering its outer side. The heat-conductivity-enhanced protective layer 9 is prepared by resin (preferably polyimide resin) with nano-aluminum nitride particles and nano-tungsten oxide particles, so that its refractive index changes by ≥0.02 / ℃ in the range of 25-80℃. Combined with OTDR optical time domain reflectance technology, it can accurately sense and locate the temperature. The particle size of the nano-aluminum nitride particles and nano-tungsten oxide particles is 2-15μm, and the thickness of the heat-conductivity-enhanced protective layer 9 is 0.1-0.4mm.

[0029] This invention also discloses a method for preparing a building monitoring heat-sensitive optoelectronic hybrid cable, comprising the following steps: 1) Fabrication of conductor units, signal transmission fiber optic units, and temperature sensing fiber optic units; Several copper conductors 5 are twisted together, and then an insulating layer 4 with a thickness of 0.5-1mm is extruded on the outside to obtain a conductor unit; Low-smoke halogen-free material LSZH is extruded onto the outside of the signal transmission optical fiber 6 to obtain the signal transmission optical fiber unit. A heat-conducting enhanced protective layer 9 is extruded onto the outside of the temperature-sensing optical fiber 8 to obtain a temperature-sensing optical fiber unit; 2) Cable making: The conductor unit, signal transmission fiber unit and temperature sensing fiber unit are arranged as required. The signal transmission fiber unit and temperature sensing fiber unit are respectively set on the upper and lower sides of the conductor unit. The gap between the cable core is filled with non-metallic aramid fiber bundles 3 that continuously and tightly wrap the conductor unit, signal transmission fiber unit and temperature sensing fiber unit. The filling density is 60%-80% and the fiber direction is wound at a spiral angle of 5°-20° with the cable core axis. The cable making direction is right-handed. 3) Water-blocking layer 2: Double-sided co-extruded water-blocking tape is wrapped around the outside of the cable core. Hot melt adhesive is coated on the inside of the double-sided co-extruded water-blocking tape. When the cable core is cabled, the hot melt adhesive penetrates into the gaps of the non-metallic aramid fiber bundles 3. 4) Extruded outer sheath 1: An outer sheath 1 with a thickness of 1-3mm is extruded on the outside of the water-blocking layer 2 to form the required building monitoring heat-sensitive optical-electric hybrid cable.

[0030] Example 1 like Figure 1 As shown, a building monitoring heat-sensitive optical-electric hybrid cable includes an outer sheath 1, a water-blocking layer 2, and a cable core arranged sequentially from the outside to the inside. The cable core includes two conductor units, one signal transmission optical fiber unit, and one temperature-sensing optical fiber unit. The gaps between the cable cores are filled with continuous and tightly wrapped non-metallic aramid fiber bundles 3, with a filling density of 60% and the fibers wound at a 10° helical angle to the cable core axis. This improves the tensile strength of the hybrid cable and also acts as a buffer, absorbing mechanical stress and extending the cabling distance. It is suitable for long-distance cabling between buildings. Because it is completely non-metallic, electromagnetic interference is avoided, making it more suitable for sensitive monitoring scenarios.

[0031] The outer protective layer 1 can be made of conventional low-smoke halogen-free flame-retardant sheath material, which can be extruded onto the water-blocking layer 2 through conventional extrusion process.

[0032] The water-blocking layer 2 is a double-sided co-extruded water-blocking tape, with hot melt adhesive coated on its inner side. When the cable core is stranded, the hot melt adhesive penetrates into the gaps of the non-metallic aramid fiber bundles 3 to form a three-dimensional water-blocking structure, preventing water from entering the mixed cable and ensuring stable and safe transmission of optical signals and electrical energy.

[0033] The conductor unit includes an insulating layer 4 and several copper conductors 5 encased within it. The insulating layer 4 is made of cross-linked polyethylene (XLPE). The use of XLPE transforms the linear structure of the polyethylene molecules into a three-dimensional network structure, significantly improving the conductor unit's overall performance, including mechanical properties, heat resistance, environmental stress cracking resistance, chemical corrosion resistance, creep resistance, electrical properties, and temperature rating. It also significantly enhances the current-carrying capacity of the copper conductors. The copper conductors 5 are tin-plated. Tin plating improves the oxidation resistance and heat dissipation of the copper conductors 5, prevents adhesion between the copper conductors 5 and the insulating layer 4, thus preventing the core from turning black and becoming brittle. It also improves weldability and conductivity, effectively extending the service life.

[0034] Signal transmission fiber optic units and temperature sensing fiber optic units are symmetrically arranged on the upper and lower sides of the conductor unit.

[0035] The signal transmission fiber unit includes a signal transmission fiber 6 and a protective layer 7 covering its outer side. The protective layer 7 uses low-smoke halogen-free LSZH and has a thickness of 0.1 mm.

[0036] The temperature-sensing fiber unit includes a temperature-sensing fiber 8 and a heat conduction-enhanced protective layer 9 covering its outer side. The heat conduction-enhanced protective layer 9 is made of polyimide resin and nano-aluminum nitride particles and nano-tungsten oxide particles, so that its refractive index changes by ≥0.02 / ℃ in the range of 25-80℃. Combined with OTDR optical time domain reflectance technology, it can accurately sense and locate the temperature. The particle size of the nano-aluminum nitride particles and nano-tungsten oxide particles is 8μm, and the thickness of the heat conduction-enhanced protective layer 9 is 0.1mm.

[0037] A method for preparing a building monitoring heat-sensitive optical-electric hybrid cable includes the following steps: 1) Fabrication of conductor units, signal transmission fiber optic units, and temperature sensing fiber optic units; Several copper conductors 5 are twisted together, and then an insulating layer 4 with a thickness of 0.5 mm is extruded on the outside to obtain a conductor unit; Low-smoke halogen-free material LSZH is extruded onto the outside of the signal transmission optical fiber 6 to obtain the signal transmission optical fiber unit. A heat-conducting enhanced protective layer 9 is extruded onto the outside of the temperature-sensing optical fiber 8 to obtain a temperature-sensing optical fiber unit; 2) Cable making: The conductor unit, signal transmission fiber unit and temperature sensing fiber unit are arranged as required. The signal transmission fiber unit and temperature sensing fiber unit are respectively set on the upper and lower sides of the conductor unit. The gap between the cable core is filled with non-metallic aramid fiber bundles 3 that continuously and tightly wrap the conductor unit, signal transmission fiber unit and temperature sensing fiber unit. The filling density is 60% and the fiber direction is wound at a 10° spiral angle with the cable core axis. The cable making direction is right-handed. 3) Water-blocking layer 2: Double-sided co-extruded water-blocking tape is wrapped around the outside of the cable core. Hot melt adhesive is coated on the inside of the double-sided co-extruded water-blocking tape. When the cable core is cabled, the hot melt adhesive penetrates into the gaps of the non-metallic aramid fiber bundles 3. 4) Extruded outer sheath 1: An outer sheath 1 with a thickness of 2mm is extruded on the outside of the water-blocking layer 2 to form the required building monitoring heat-sensitive optical-electric hybrid cable.

[0038] Example 2 like Figure 1As shown, a building monitoring heat-sensitive optical-electric hybrid cable includes an outer sheath 1, a water-blocking layer 2, and a cable core arranged sequentially from the outside to the inside. The cable core includes two conductor units, one signal transmission optical fiber unit, and one temperature-sensing optical fiber unit. The gaps between the cable cores are filled with continuous and tightly wrapped non-metallic aramid fiber bundles 3, with a filling density of 80% and the fibers wound at a 10° helical angle to the cable core axis. This improves the tensile strength of the hybrid cable and also acts as a buffer, absorbing mechanical stress and extending the cabling distance. It is suitable for long-distance cabling between buildings. Because it is completely non-metallic, electromagnetic interference is avoided, making it more suitable for sensitive monitoring scenarios.

[0039] The raw materials for preparing the outer protective layer 1 include the following components in parts by weight: 60 parts of hydrogenated nitrile butadiene rubber 40 parts of chlorosulfonated polyethylene 30 parts of core-shell flame retardant 5 parts of carbon nanotubes 5 parts of zinc oxide nanocrystals 5 parts of silane coupling agent KH-570.

[0040] The core-shell flame retardant is prepared by reacting triazine compound cyanurate, ammonium polyphosphate, and aminated mesoporous SiO2. The aminated mesoporous SiO2 has a pore size of 10 nm and a specific surface area of ​​600 m². 2 / g, triazine compound cyanurate and ammonium polyphosphate were prepared by the following steps at a molar ratio of 1:2: First, the mesoporous silica microspheres are hydroxylated. Hydroxyl groups can be modified on the silica surface using conventional wet chemical methods or vapor deposition. Then, amino groups are modified on the silica surface using conventional silane coupling agent methods or graft polymerization methods. Finally, centrifugation washing and vacuum drying (80℃, 24h) are performed to obtain the desired aminated mesoporous SiO2.

[0041] Core-shell flame retardants are prepared using the following steps: In a supercritical CO2 reactor at 13 MPa and 32 °C, aminated mesoporous SiO2 was mixed with triazine compound cyanurate and held under pressure for 1 h to promote the infiltration of triazine compound cyanurate into the mesopores. The pressure was then reduced to 6 MPa, and ammonium polyphosphate and sodium citrate were added. The temperature was raised to 60 °C and held under pressure for 2 h to promote the eutectic formation of triazine compound cyanurate and ammonium polyphosphate in the mesopores. The pressure was released, the mixture was centrifuged, and dried to obtain the precursor. The eutectic formation was further promoted by adding sodium citrate. The precursor was then dispersed in an ethanol-water solution, and 0.1 mol / L hydrochloric acid was added to adjust the pH to 3. Tetraethyl orthosilicate (8% of the precursor weight) was then added, and the mixture was stirred at 60 °C for 3 h. Finally, the mixture was centrifuged and washed, and then heat-treated at 120 °C for 2 h in an ammonia atmosphere (non-air).

[0042] Mix 60 parts of hydrogenated nitrile rubber, 40 parts of chlorosulfonated polyethylene, 5 parts of carbon nanotubes, and 5 parts of silane coupling agent KH-570. Then add 30 parts of core-shell flame retardant and 5 parts of zinc oxide nanocrystals. Mix for 15 minutes at 150°C and 40 rpm. Then add the mixture to a twin-screw extruder and melt-extrude it onto the outside of the water-blocking layer 2. Cool down and cure to form the outer protective layer 1.

[0043] The water-blocking layer 2 is a double-sided co-extruded water-blocking tape, with hot melt adhesive coated on its inner side. When the cable core is stranded, the hot melt adhesive penetrates into the gaps of the non-metallic aramid fiber bundles 3 to form a three-dimensional water-blocking structure.

[0044] The conductor unit includes an insulating layer 4 and several copper conductors 5 encased within it. The insulating layer 4 is made of cross-linked polyethylene (XLPE). The use of XLPE transforms the linear structure of the polyethylene molecules into a three-dimensional network structure, significantly improving the conductor unit's overall performance, including mechanical properties, heat resistance, environmental stress cracking resistance, chemical corrosion resistance, creep resistance, electrical properties, and temperature rating. It also significantly enhances the current-carrying capacity of the copper conductors. The copper conductors 5 are tin-plated. Tin plating improves the oxidation resistance and heat dissipation of the copper conductors 5, prevents adhesion between the copper conductors 5 and the insulating layer 4, thus preventing the core from turning black and becoming brittle. It also improves weldability and conductivity, effectively extending the service life.

[0045] Signal transmission fiber optic units and temperature sensing fiber optic units are symmetrically arranged on the upper and lower sides of the conductor unit. The outer diameters of the signal transmission fiber optic units and the temperature sensing fiber optic units are the same, and both are smaller than the outer diameter of the conductor unit.

[0046] The signal transmission fiber unit includes a signal transmission fiber 6 and a protective layer 7 covering its outer side. The protective layer 7 uses low-smoke halogen-free LSZH and has a thickness of 0.2 mm.

[0047] The temperature-sensing fiber unit includes a temperature-sensing fiber 8 (temperature-sensing multimode fiber) and a heat conduction-enhanced protective layer 9 covering its outer side. The heat conduction-enhanced protective layer 9 is prepared by polyimide resin with nano-aluminum nitride particles and nano-tungsten oxide particles. The particle size of the nano-aluminum nitride particles and the nano-tungsten oxide particles are 5μm, and the thickness of the heat conduction-enhanced protective layer 9 is 0.2mm.

[0048] A method for preparing a building monitoring heat-sensitive optical-electric hybrid cable includes the following steps: 1) Fabrication of conductor units, signal transmission fiber optic units, and temperature sensing fiber optic units; Several copper conductors 5 are twisted together, and then an insulating layer 4 with a thickness of 0.5 mm is extruded on the outside to obtain a conductor unit; Low-smoke halogen-free material LSZH is extruded onto the outside of the signal transmission optical fiber 6 to obtain the signal transmission optical fiber unit. A heat-conducting enhanced protective layer 9 is extruded onto the outside of the temperature-sensing optical fiber 8 to obtain a temperature-sensing optical fiber unit; 2) Cable formation: The conductor unit, signal transmission fiber unit and temperature sensing fiber unit are arranged as required. The signal transmission fiber unit and temperature sensing fiber unit are respectively set on the upper and lower sides of the conductor unit. The gap between the cable core is filled with non-metallic aramid fiber bundles 3 that continuously and tightly wrap the conductor unit, signal transmission fiber unit and temperature sensing fiber unit. The filling density is 80% and the fiber direction is wound at a 10° helical angle with the cable core axis. The cable formation direction is right-handed. 3) Water-blocking layer 2: Double-sided co-extruded water-blocking tape is wrapped around the outside of the cable core. Hot melt adhesive is coated on the inside of the double-sided co-extruded water-blocking tape. When the cable core is cabled, the hot melt adhesive penetrates into the gaps of the non-metallic aramid fiber bundles 3. 4) Extruded outer sheath 1: An outer sheath 1 with a thickness of 1.5mm is extruded on the outside of the water-blocking layer 2 to form the required building monitoring heat-sensitive optical-electric hybrid cable.

[0049] The rest is the same as in Example 1.

[0050] Any parts or structures not specifically described in this invention can be made using existing technologies or products, and will not be elaborated upon here.

[0051] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A building monitoring thermal-sensitive photoelectric hybrid cable, characterized in that, It includes an outer sheath, a water-blocking layer, and a cable core arranged sequentially from the outside to the inside. The cable core includes at least one conductor unit, at least one signal transmission optical fiber unit, and at least one temperature sensing optical fiber unit.

2. The building monitoring heat-sensitive photoelectric hybrid cable according to claim 1, characterized in that, The gaps in the cable core are filled with non-metallic aramid fiber bundles that continuously and tightly wrap the conductor unit, signal transmission fiber unit, and temperature sensing fiber unit. The filling density is 60%-80%, and the fiber orientation is wound with a helical angle of 5°-20° with the cable core axis.

3. The building monitoring thermal-sensitive photoelectric hybrid cable according to claim 1, characterized in that, There are two conductor units, one signal transmission fiber optic unit and one temperature sensing fiber optic unit, which are symmetrically arranged on the upper and lower sides of the conductor unit.

4. The building monitoring heat-sensitive photoelectric hybrid cable according to claim 1, characterized in that, The conductor unit includes an insulating layer and a plurality of copper conductors encased therein. The insulating layer is made of cross-linked polyethylene, and the copper conductors are tin-plated copper conductors.

5. A building monitoring thermal-sensitive photoelectric hybrid cable according to claim 1, characterized in that, The signal transmission fiber unit includes a signal transmission fiber and a protective layer covering its outer side.

6. The building monitoring thermal-sensitive photoelectric hybrid cable according to claim 1, characterized in that, The temperature-sensing optical fiber unit includes a temperature-sensing optical fiber and a heat conduction-enhanced protective layer covering its outer side. The heat conduction-enhanced protective layer is prepared by resin and nano-aluminum nitride particles and nano-tungsten oxide particles, and the particle sizes of the nano-aluminum nitride particles and nano-tungsten oxide particles are 2-15μm, respectively.

7. A building monitoring thermal-sensitive photoelectric hybrid cable according to claim 1, characterized in that, The raw materials for preparing the outer protective layer include the following components in parts by weight: 50-70 parts of hydrogenated nitrile butadiene rubber 30-50 parts of chlorosulfonated polyethylene 30-50 parts of core-shell flame retardant 5-10 parts of carbon nanotubes 2-8 parts of zinc oxide nanocrystals Functional additives 1-10 parts.

8. A building monitoring thermal-sensitive photoelectric hybrid cable according to claim 7, characterized in that, The core-shell flame retardant is prepared by reacting triazine cyanurate, ammonium polyphosphate, and aminated mesoporous SiO2. The aminated mesoporous SiO2 has a pore size of 8-15 nm and a specific surface area of ​​500-700 m². 2 / g.

9. A building monitoring thermal-sensitive photoelectric hybrid cable according to claim 7, characterized in that, The functional additive is at least one of silane coupling agents, UV oxidants, and anti-aging agents.

10. A method for preparing a building monitoring thermal-sensitive optoelectronic hybrid cable according to any one of claims 1-9, characterized in that, Includes the following steps: 1) Fabrication of conductor units, signal transmission fiber optic units, and temperature sensing fiber optic units; 2) Cable making: The conductor unit, signal transmission fiber unit and temperature sensing fiber unit are arranged as required. The gaps between the cable cores are filled with non-metallic aramid fiber bundles that continuously and tightly wrap the conductor unit, signal transmission fiber unit and temperature sensing fiber unit. The filling density is 60%-80% and the fiber direction is wound at a spiral angle of 5°-20° with the cable core axis. The cable making direction is right-handed. 3) Water-blocking layer: Double-sided co-extruded water-blocking tape is wrapped around the outside of the cable core. Hot melt adhesive is coated on the inside of the double-sided co-extruded water-blocking tape. When the cable core is cabled, the hot melt adhesive penetrates into the gaps of the non-metallic aramid fiber bundles. 4) Extruded outer sheath: An outer sheath is extruded on the outside of the water-blocking layer to form the required building monitoring heat-sensitive optical-electric hybrid cable.

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