B1-level flame-retardant fireproof shielding data cable

Abstract

The utility model discloses a level B1 flame-retardant fireproof shielding data cable, which comprises an insulating core wire, a flame-retardant cross skeleton, a fireproof layer, a waterproof layer, a polyester belt, an aluminum-plastic composite belt and a flame-retardant sheath, the insulating core wire is formed by co-extruding four foaming insulating layers on a conductor, the center of the flame-retardant cross skeleton is filled with a waterproof rope, and the flame-retardant cross skeleton is filled with a flame-retardant layer. Every two insulating core wires are twisted into a group of twisted pair wires, a fireproof layer is wrapped on the twisted pair wires, a waterproof layer is wrapped on the fireproof layer, a group of twisted pair wires is placed in each of four grooves of the flame-retardant cross-shaped framework, a polyester belt is wrapped on the flame-retardant cross-shaped framework, an aluminum-plastic composite belt is wrapped on the polyester belt, and the flame-retardant cross-shaped framework is wrapped on the aluminum-plastic composite belt. A ground wire is longitudinally arranged between the polyester belt and the aluminum foil layer of the aluminum-plastic composite belt, an oxygen barrier layer is compounded on the aluminum-plastic composite belt, and a flame-retardant sheath is extruded on the oxygen barrier layer of the aluminum-plastic composite belt. The flame-retardant and fire-resistant communication cable has high flame-retardant and fire-resistant performance, and good communication performance can be ensured in a fire disaster.

Description

Technical Field

[0001] The utility model relates to the field of cables, in particular to a B1-level flame-retardant and fire-resistant shielded data cable. Background Art

[0002] With the development of communication technology, the transmission requirements of cables are getting higher and higher. In places such as industrial control systems, medical industries, security systems and military fields, it is necessary to ensure the accuracy and reliability of signal or data transmission to avoid external electromagnetic signal interference affecting the normal operation of the inner conductor of the cable. This requires the use of shielded data cables with strong signal shielding performance. In the event of natural disasters, the most damaging thing to cables is actually cable fires. Once a cable catches fire, it is easy to affect the signal transmission performance of the cable. When the cable has a signal transmission barrier, it will cause the alarm system, detection system, fire protection system and other rescue systems in the fire place to fail, which will affect the evacuation efficiency of the victims and the rescue speed of the rescue personnel. Therefore, higher requirements are put forward for the flame retardant and fire resistance of the cable. Utility Model Content

[0003] The utility model aims to provide a B1-class flame-retardant and fire-resistant shielded data cable, the cable having the structure can maintain complete communication capability in a fire.

[0004] To achieve the above-mentioned purpose, the technical scheme adopted by the utility model is: B1 grade flame retardant and fire resistant shielded data cable, including: an insulating core wire, a flame retardant cross skeleton, a fire resistant layer, a water blocking layer, a polyester tape, an aluminum-plastic composite tape and a flame retardant sheath, the insulating core wire is co-extruded on the conductor by four layers of foamed insulating layers, a water blocking rope is filled at the center of the flame retardant cross skeleton, every two insulating core wires are twisted into a group of twisted wires, a fire resistant layer is wrapped around the twisted wires, a water blocking layer is wrapped on the fire resistant layer, a group of twisted wires are placed in the four grooves of the flame retardant cross skeleton, a polyester tape is wrapped on the flame retardant cross skeleton, an aluminum-plastic composite tape is wrapped on the polyester tape, the aluminum foil layer of the aluminum-plastic composite tape faces the polyester tape, a ground wire is longitudinally arranged between the polyester tape and the aluminum foil layer of the aluminum-plastic composite tape, an oxygen insulation layer is compounded on the PVC layer of the aluminum-plastic composite tape, and a flame retardant sheath is extruded on the oxygen insulation layer of the aluminum-plastic composite tape.

[0005] Furthermore, in the aforementioned B1-class flame-retardant and fire-resistant shielded data cable, the flame-retardant cross skeleton is formed by injection molding after mixing HDPE material with aluminum hydroxide particles, and the particle size of the aluminum hydroxide particles is less than 2 μm.

[0006] Furthermore, in the aforementioned B1-class flame-retardant and fire-resistant shielded data cable, the oxygen-isolating layer is formed by injection molding a mixture of HDPE material and aluminum hydroxide particles, and the particle size of the aluminum hydroxide particles is less than 2 μm.

[0007] Furthermore, in the aforementioned B1-class flame-retardant and fire-resistant shielded data cable, the wrapping direction of the aluminum-plastic composite tape is opposite to the wrapping direction of the polyester tape.

[0008] Furthermore, in the aforementioned B1 grade flame retardant and fire resistant shielded data cable, the four-layer foam insulation layer includes: a polyethylene layer, a fluoroplastic layer, a polyurethane layer and a polyvinyl chloride layer, the polyethylene layer is directly coated on the conductor, the fluoroplastic layer is coated on the polyethylene layer, the polyurethane layer is coated on the fluoroplastic layer, and the polyvinyl chloride layer is coated on the polyurethane layer, the four-layer foam insulation layer of the same insulating core wire has the same color, and the four-layer foam insulation layer between different insulating core wires has different colors.

[0009] Furthermore, in the aforementioned B1-class flame-retardant and fire-resistant shielded data cable, the groove width of the flame-retardant cross skeleton is the same as the outer diameter of the twisted wire.

[0010] Furthermore, in the aforementioned Class B1 flame-retardant and fire-resistant shielded data cable, the twisting pitches of the four sets of twisted wires are all different and are not multiples.

[0011] Furthermore, in the aforementioned B1 grade flame retardant and fire resistant shielded data cable, the fire resistant layer is two layers of mica tape wrapped, the wrapping directions of the two layers of mica tape are different, and the overlap rate of the two layers of mica tape needs to be maintained between 45% and 50%, and the wrapping direction of the water blocking layer is opposite to the wrapping direction of the outer layer of mica tape.

[0012] Furthermore, in the aforementioned B1-class flame-retardant and fire-resistant shielded data cable, the flame-retardant sheath is made of a halogen-free cross-linked polyethylene material.

[0013] The advantages of the utility model are as follows: the signal transmission performance of the insulating core wire can be improved by co-extruding four layers of foamed insulating layers on the conductor, and the four layers of foamed insulating layers can be compounded together to improve the mechanical and physical properties of the insulating core wire and the protection strength of the conductor; when the aluminum foil layer in the aluminum-plastic composite tape contacts the ground wire, it can effectively attach electromagnetic waves to the surface and generate induced currents, and these interference currents can be introduced into the earth through grounding to avoid interference with the transmission signal and improve the shielding performance; the oxygen-isolating layer is compounded on the PVC layer of the aluminum-plastic composite tape, and in a fire, the oxygen-isolating layer can first contact with the flame to decompose and precipitate crystal water, thereby reducing the contact area between the aluminum-plastic composite tape and the flame, thereby protecting the aluminum-plastic composite tape and preventing the aluminum-plastic composite tape from being burned by the flame; when the flame is small or the flame is far away from the cable, the flame-retardant sheath can play a flame-retardant role to extinguish the small flame, prevent the flame from spreading on the cable, and expand the winding range. , thereby protecting the components inside the cable from the impact of the flame; when the flame is large or the cable is continuously burned, the aluminum hydroxide particles in the oxygen-isolating layer and the flame-retardant cross skeleton will decompose after being heated to form a non-flammable and non-fusible aluminum oxide protective layer to prevent the spread of the fire, and will also precipitate crystalline water to reduce the temperature of the inner wall of the cable and evaporate to form water vapor after contact with the fire, diluting the oxygen in the cable and further reducing the spread of the fire. The fire-resistant layer and polyester tape can remain stable at high temperatures, protecting the insulated core wires in the twisted pair from damage, thereby ensuring that the insulated core wires can maintain good communication performance; during the fire-fighting process, after the cable touches water, the water-blocking layer and the water-blocking rope absorb water and expand to cover and seal the insulated core wire, preventing water from diffusing into the cable and affecting the communication performance of the insulated core wire, ensuring good communication performance of the cable throughout the fire, keeping various rescue systems unobstructed, and facilitating the evacuation of disaster victims and the entry of rescue personnel for firefighting and rescue. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the B1-level flame-retardant and fire-resistant shielded data cable described in the utility model.

[0015] Figure 2 yes Figure 1 Schematic diagram of the connection structure between the aluminum-plastic composite tape and the oxygen barrier layer. DETAILED DESCRIPTION

[0016] The technical solution of the utility model is further described below in conjunction with the accompanying drawings and preferred embodiments.

[0017] like Figure 1 , Figure 2As shown, the B1-level flame-retardant and fire-resistant shielded data cable described in the utility model comprises: an insulating core wire 1, a flame-retardant cross skeleton 2, a fire-resistant layer 3, a water-blocking layer 4, a polyester tape 5, an aluminum-plastic composite tape 6 and a flame-retardant sheath 7. The insulating core wire 1 is co-extruded on a conductor 11 by four layers of foamed insulating layers. The four layers of foamed insulating layers comprise: a polyethylene layer 12, a fluoroplastic layer 13, a polyurethane layer 14 and a polyvinyl chloride layer 15. The polyethylene layer 12 is directly coated on the conductor 11, the fluoroplastic layer 13 is coated on the polyethylene layer 12, the polyurethane layer 14 is coated on the fluoroplastic layer 13, and the polyvinyl chloride layer 15 is coated on the polyurethane layer 14. The polyethylene layer 12 has good electrical insulation performance and chemical stability, and its direct coating on the conductor 11 can effectively protect the conductor 1 1. Prevent current leakage and ensure the stability of signal transmission. The fluoroplastic layer is resistant to high temperature and chemical corrosion, and can still maintain good electrical insulation performance at high temperature. The polyurethane layer 14 has high mechanical strength and wear resistance, which can improve the physical properties and mechanical strength of the insulating core wire 1. At the same time, the polyurethane layer 14 also provides good electrical insulation performance. The polyvinyl chloride layer 15 has good mechanical properties and chemical corrosion resistance, which enhances the durability and environmental stress resistance of the insulating core wire 1. The polyethylene layer 12, the fluoroplastic layer 13, the polyurethane layer 14 and the polyvinyl chloride layer 15 are foamed and co-extruded, which can not only improve the coaxiality between the layers, but also reduce the weight and improve the insulation performance by foaming, thereby improving the signal transmission speed and frequency of the insulating core wire 1. The four layers of foamed insulation layers of the same insulating core wire 1 are of the same color, and the four layers of foamed insulation layers between different insulating core wires 1 are of different colors. This is convenient for the staff to select the correct insulating core wire 1 by color when connecting the equipment, and can also be correctly matched according to the color of the insulating layer on the insulating core wire 1 when the damaged cable needs to be replaced after a fire.Every two insulated core wires 1 are twisted into a pair of twisted wires, and a fire-resistant layer 3 is wrapped around the twisted wires. The fire-resistant layer 3 is two layers of mica tapes arranged for wrapping. The mica tape has high fire resistance and can remain stable at high temperatures, thereby protecting the insulated core wires 1 in the twisted wires from damage. Wrapping with two layers of mica tape can further improve the protection of the insulated core wires 1. The wrapping directions of the two layers of mica tape are different, and the overlap rates of the two layers of mica tapes need to be maintained between 45% and 50%. The different wrapping directions of the two layers of mica tape can enhance the mechanical strength of the twisted wires. When external forces act on the twisted wires, the two layers of mica tapes in different directions can better The pressure is dispersed and the force directly acting on the insulated core wire 1 in the twisted pair is reduced, thereby protecting the insulated core wire 1 in the twisted pair. The overlap rate is maintained between 45% and 50%, which can prevent the mica tape from causing structural damage due to expansion or contraction of the material at high temperature, thereby maintaining the overall integrity of the twisted pair. A water-blocking layer 4 is wrapped on the fire-resistant layer 3. The water-blocking layer 4 is a water-blocking tape. The water-blocking layer 4 expands when it encounters water to achieve a water-blocking effect. The wrapping direction of the water-blocking layer 4 is opposite to the wrapping direction of the outer mica tape. The water-blocking layer 4 and the mica tape of the outer layer of the fire-resistant layer 3 are wrapped in reverse to further improve the mechanical strength of the twisted pair.

[0018] The flame retardant cross frame 2 is made of a mixture of HDPE material and aluminum hydroxide particles and then injection molded. The particle size of the aluminum hydroxide particles is less than 2μm. Although the flame retardant cross frame 2 made of HDPE material has good wear resistance, toughness and electrical insulation, it is also flammable and easy to continue burning in a fire. After mixing aluminum hydroxide particles in HDPE, the flame retardant properties of aluminum hydroxide can be used to suppress the flammability of HDPE. The particle size of aluminum hydroxide particles is less than 2μm, which can increase the reaction surface area of ​​aluminum hydroxide particles, increase the reaction speed, and can decompose and precipitate more quickly in a high temperature environment. Crystallized water, and the particle size is less than 2μm, which can be more evenly dispersed in the HDPE material to improve the overall performance. The center of the flame-retardant cross skeleton 2 is filled with a water-blocking rope 21, and a group of twisted wires are placed in the four grooves of the flame-retardant cross skeleton 2. The groove width of the flame-retardant cross skeleton 2 is the same as the outer diameter of the twisted wires, ensuring that the four groups of twisted wires can be tightly fixed on the flame-retardant cross skeleton 2, improving the balance characteristics and anti-crosstalk between the four groups of twisted wires. The twisted pitches of the four groups of twisted wires are different and not multiples, which can prevent signal resonance between the twisted wires, thereby ensuring the stability and clarity of signal transmission.

[0019] A polyester tape 5 is wrapped around the flame retardant cross frame 2. The polyester tape 5 can fix the four sets of twisted wires in the four grooves of the flame retardant cross frame 2. Because the polyester tape 5 has good high temperature resistance, it can maintain its own performance for a certain period of time in a high temperature environment. An aluminum-plastic composite tape 6 is wrapped around the polyester tape 5. The wrapping direction of the aluminum-plastic composite tape 6 is opposite to that of the polyester tape 5. The aluminum foil layer 61 of the aluminum-plastic composite tape 6 faces the polyester tape 5. A ground wire 8 is longitudinally arranged between the polyester tape 5 and the aluminum foil layer 61 of the aluminum-plastic composite tape 6. The aluminum foil layer 61 of the belt 6 can not only play a shielding role, but also play a flame retardant role. When the aluminum foil layer 61 contacts the ground wire 8, it can effectively attach electromagnetic waves to the surface and generate induced currents. These interference currents can be introduced into the earth through grounding to avoid interference with the transmission signal and improve the shielding performance. An oxygen barrier layer 63 is compounded on the PVC layer 62 of the aluminum-plastic composite belt 6. PVC has good flame retardancy and mechanical properties. The oxygen barrier layer 63 is made of a mixture of HDPE material and aluminum hydroxide particles after injection molding. The particles of aluminum hydroxide particles are The particle size is less than 2μm. In the actual production process, since both PVC and HDPE are inert materials, the two are not easy to bond. Corona treatment is needed to improve the adhesion of the surfaces of the two. Corona discharge is generated on the surfaces of PVC and HDPE through high-frequency high-voltage electricity to destroy the chemical bonds of the plastic molecules and improve the surface performance of the plastic. When the two are compounded together, they can bond to each other. However, after the bonding is completed, they need to be destaticized before they can be wrapped on the polyester belt 5. A flame retardant sheath 7 is extruded on the oxygen-isolating layer 63 of the aluminum-plastic composite belt 6. The flame retardant sheath 7 is made of a halogen-free cross-linked polyethylene material. Since the cross-linked polyethylene and HDPE are similar in chemical structure, the two have good compatibility. Therefore, when the flame retardant sheath 7 is extruded, the flame retardant sheath 7 can be bonded to the oxygen-isolating layer 63 on the aluminum-plastic composite belt 6 to improve the integrity of the cable. The cross-linked polyethylene material can slow down the propagation speed of the flame, and the halogen-free cross-linked polyethylene material will not produce harmful halogen gas when burning, reducing the harm to the environment and human body, and helping to improve the visibility of the fire scene and the probability of escape.

[0020] When a fire occurs, if the flame is small or the flame is far away from the cable, the flame retardant sheath 7 in the cable will play a flame retardant role to extinguish the small flame, prevent the flame from spreading on the flame retardant sheath 7, expand the combustion range, and protect the components inside the cable from being affected by the flame; if the flame is large or the cable continues to burn, the flame retardant sheath 7 will not be able to withstand it and will be burned through. At this time, the aluminum hydroxide particles in the oxygen isolation layer 63 and the flame retardant cross skeleton 2 will decompose and release crystal water after being subjected to high-temperature radiation. The aluminum oxide decomposed in the oxygen isolation layer 63 is non-flammable and has a high melting point. The aluminum oxide can isolate oxygen and flame, prevent the fire from spreading, reduce the contact area between the flame and the aluminum-plastic composite tape 6, and protect the aluminum foil layer 61 in the aluminum-plastic composite tape 6 from being burned, so that the aluminum-plastic composite tape 6 continues to play a shielding role in the fire, and the crystal water released in the oxygen isolation layer 63 can, on the one hand, reduce the temperature inside the cable, and on the other hand, When it comes into contact with the flame, it evaporates to form water vapor, which dilutes the oxygen in the cable and reduces the spread of the flame into the cable. In a high temperature environment, the polyester tape 5 can maintain its own characteristics and play a certain heat-insulating role, and the mica tape in the fire-resistant layer 3 can also play a heat-insulating role for the twisted pair in a high temperature environment. The double protection can enable the insulated core wire 1 in the twisted pair to maintain stable communication capabilities in a fire, and the aluminum foil layer 61 in the aluminum-plastic composite tape 6 can continue to play a shielding role when subjected to high temperature, and the crystallization water released by the aluminum hydroxide particles in the flame-retardant cross skeleton 2 will be absorbed by the water-blocking layer 4 and the water-blocking rope 21, and the water-blocking layer 4 will expand and compress and wrap around the twisted pair so that the insulated core wire 1 in the twisted pair is not affected by the crystallization water. When the expanded water-blocking layer 4 and the water-blocking rope 21 are subjected to high-temperature radiation, the polymer polymerized with water in the water-blocking layer 4 and the water-blocking rope 21 will decompose to form water vapor and carbon dioxide after being heated, thereby playing a flame-retardant effect. When using water to extinguish a fire, since the water-blocking layer 4 and the water-blocking rope 21 that have absorbed the crystallized water are not saturated, they will absorb a large amount of water and continue to expand when encountering water, thereby playing a water-blocking role and preventing the water during fire extinguishing from penetrating into the cable and affecting the communication performance of the insulated core wire 1.

[0021] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model is described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the utility model can still be modified or replaced by equivalents, and any modification or equivalent replacement that does not depart from the spirit and scope of the utility model should be included in the scope of protection of the claims of the utility model.

Claims

1. B1 flame retardant and fire resistant shielded data cable, characterized by: include: Insulated core wire, flame retardant cross skeleton, fire resistant layer, water blocking layer, polyester tape, aluminum-plastic composite tape and flame retardant sheath, the insulated core wire is co-extruded on the conductor by four layers of foamed insulation layers, the center of the flame retardant cross skeleton is filled with water blocking rope, every two insulated core wires are twisted into a group of twisted wires, a fire resistant layer is wrapped on the twisted wires, a water blocking layer is wrapped on the fire resistant layer, a group of twisted wires are placed in the four grooves of the flame retardant cross skeleton, a polyester tape is wrapped on the flame retardant cross skeleton, an aluminum-plastic composite tape is wrapped on the polyester tape, the aluminum foil layer of the aluminum-plastic composite tape faces the polyester tape, a ground wire is longitudinally arranged between the polyester tape and the aluminum foil layer of the aluminum-plastic composite tape, an oxygen insulation layer is compounded on the PVC layer of the aluminum-plastic composite tape, and a flame retardant sheath is extruded on the oxygen insulation layer of the aluminum-plastic composite tape.

2. The B1 flame retardant and fire resistant shielded data cable according to claim 1, characterized in that: The flame retardant cross frame is formed by mixing HDPE material with aluminum hydroxide particles and then injection molding. The particle size of the aluminum hydroxide particles is less than 2μm.

3. The B1 flame retardant and fire resistant shielded data cable according to claim 2, characterized in that: The oxygen barrier layer is formed by mixing HDPE material and aluminum hydroxide particles and then injection molding. The particle size of the aluminum hydroxide particles is less than 2μm.

4. The B1 flame retardant and fire resistant shielded data cable according to claim 3, characterized in that: The wrapping direction of the aluminum-plastic composite tape is opposite to that of the polyester tape.

5. The B1 flame retardant and fire resistant shielded data cable according to claim 1, characterized in that: The four-layer foam insulation layer includes: a polyethylene layer, a fluoroplastic layer, a polyurethane layer and a polyvinyl chloride layer. The polyethylene layer is directly coated on the conductor, the fluoroplastic layer is coated on the polyethylene layer, the polyurethane layer is coated on the fluoroplastic layer, and the polyvinyl chloride layer is coated on the polyurethane layer. The four-layer foam insulation layers of the same insulating core wire have the same color, and the four-layer foam insulation layers between different insulating core wires have different colors.

6. The B1 flame retardant and fire resistant shielded data cable according to claim 1, characterized in that: The groove width of the flame retardant cross skeleton is the same as the outer diameter of the twisted wire.

7. The B1 flame retardant and fire resistant shielded data cable according to claim 1, characterized in that: The twist pitches of the four pairs of twisted wires are all different and not multiples.

8. The B1 flame retardant and fire resistant shielded data cable according to claim 1, characterized in that: The fire-resistant layer is two layers of mica tape wrapped in different directions, and the overlap rate of the two layers of mica tape must be maintained between 45% and 50%. The wrapping direction of the water-blocking layer is opposite to that of the outer mica tape.

9. The B1 flame retardant and fire resistant shielded data cable according to claim 1, characterized in that: The flame retardant sheath is made of halogen-free cross-linked polyethylene material.

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