High-flame-retardant fireproof unshielded data cable
By using flame retardant cross skeleton, refractory layer, water barrier layer and oxygen barrier layer in unshielded data cables, aluminium hydroxide particles and glass cloth wrapping layers form a non-combustible protective layer, which solves the problem of cables in fire. The problem of loss of communication capabilities ensures smooth communication and rescue safety in the fire.
Patent Information
- Application Number
- CN202421026313.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-13
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-05-13
AI Technical Summary
Existing unshielded data cables cannot maintain communication capabilities in fires, resulting in the failure of alarm systems, detection systems and fire protection systems in the fire, affecting the evacuation and rescue of fire personnel.
High flame retardant and refractory non-shielding data cable design, including insulated core wire, flame retardant cross skeleton, refractory layer, water barrier layer, oxygen barrier layer and flame retardant sheath, using aluminum hydroxide particles and glass cloth tape wrapping layer A non-combustible protective layer is formed at high temperatures to prevent the fire from spreading and prevent water from seeping in the fire extinguishing process through the water blocking layer and water blocking rope.
Maintain cable communication capabilities during fires, prevent flames from spreading, protect insulated core wires from damage, ensure smooth rescue system, and facilitate personnel evacuation and fire extinguishing.
Smart Images
Figure CN222260608U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of cables, in particular to a highly flame-retardant and fire-resistant non-shielded data cable. Background Art
[0002] With the development of communication technology, the transmission requirements of cables are getting higher and higher. In order to obtain higher transmission bandwidth and lower crosstalk, non-shielded data cables with strong signal transmission capability and convenient installation and wiring are generally selected in various buildings such as subways, shopping malls, hospitals, and personal residences. When selecting non-shielded data cables, it is also necessary to consider their good flame retardancy and fire resistance. This is to prevent the cable from being burned by flames and unable to guarantee signal transmission in the event of a fire. This will cause the alarm system, detection system, fire protection system and other rescue systems to fail in the fire, which will affect the evacuation of victims in the fire and the speed of rescue personnel entering the scene. Therefore, higher requirements are put forward for the flame retardancy and fire resistance of cables. Utility Model Content
[0003] The utility model aims to provide a highly flame-retardant and fire-resistant non-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 solution adopted by the utility model is: a highly flame-retardant and fire-resistant non-shielded data cable, comprising: an insulating core wire, a flame-retardant cross skeleton, a fire-resistant layer, a water-blocking layer, an oxygen-isolating layer and a flame-retardant sheath, 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 each of the four grooves of the flame-retardant cross skeleton, a first glass cloth tape layer is wrapped around the flame-retardant cross skeleton, an oxygen-isolating layer is extruded on the first glass cloth tape layer, a second glass cloth tape layer is wrapped on the oxygen-isolating layer, and a flame-retardant sheath is extruded on the second glass cloth tape layer.
[0005] Furthermore, in the aforementioned highly flame-retardant and fire-resistant non-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 2μm.
[0006] Furthermore, in the aforementioned highly flame-retardant and fire-resistant non-shielded data cable, the oxygen-isolating layer is formed by injection molding a mixture of HDPE material and aluminum hydroxide particles, the particle size of the aluminum hydroxide particles is less than 2 μm, and the thickness of the oxygen-isolating layer is between 1 mm and 2 mm.
[0007] Furthermore, in the aforementioned highly flame-retardant and fire-resistant non-shielded data cable, the groove width of the flame-retardant cross skeleton is the same as the outer diameter of the twisted pair.
[0008] Furthermore, in the aforementioned highly flame-retardant and fire-resistant non-shielded data cable, the insulating core wire comprises: a conductor, an inner insulating layer and an outer insulating layer, the conductor is twisted by 23 / 24AWG oxygen-free annealed soft copper wire, the inner insulating layer is made of HDPE material, the outer insulating layer is made of FRPE material, the inner insulating layer and the outer insulating layer are double-extruded and wrapped on the conductor, and the inner insulating layer, the outer insulating layer and the conductor are coaxially arranged.
[0009] Furthermore, in the aforementioned highly flame-retardant and fire-resistant non-shielded data cable, the inner insulation layer and the outer insulation layer of the same insulating core wire are of the same color, and the inner insulation layer and the outer insulation layer of different insulating core wires are of different colors.
[0010] Furthermore, in the aforementioned highly flame-retardant and fire-resistant non-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 highly flame-retardant and fire-resistant non-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 rates of the two layers of mica tape need 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 highly flame-retardant and fire-resistant non-shielded data cable, the flame-retardant sheath is made of a halogen-free cross-linked polyethylene material.
[0013] The utility model has the advantages that: 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, expand the winding range, and thus protect the components inside the cable from being affected by 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-meltable aluminum oxide protective layer to prevent the spread of the fire, and will also precipitate crystal water to reduce the temperature of the inner wall of the cable and evaporate to form water vapor after contacting with the fire, diluting the oxygen in the cable, further reducing the spread of the fire, and the fire-resistant layer can remain stable at high temperatures, thereby protecting the insulated core wires in the twisted pair from damage, thereby ensuring that the insulated core wires can maintain good communication performance; in the process of fire extinguishing, 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 to affect the communication performance of the insulated core wire, and ensuring good communication performance during the entire fire, so that each rescue system remains unobstructed, facilitating the evacuation of disaster victims and the entry of rescue personnel for fire extinguishing and rescue. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 The utility model discloses a highly flame-retardant and fire-resistant non-shielded data cable. DETAILED DESCRIPTION
[0015] The technical solution of the utility model is further described below in conjunction with the accompanying drawings and preferred embodiments.
[0016] like Figure 1 As shown, the highly flame-retardant and fire-resistant non-shielded data cable of 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, an oxygen-isolating layer 5 and a flame-retardant sheath 6, the insulating core wire 1 comprises: a conductor 11, an inner insulating layer 12 and an outer insulating layer 13, the conductor 11 is formed by twisting a plurality of 23 / 24AWG oxygen-free annealed soft copper wires, the conductor 11 formed by twisting 23 / 24AWG oxygen-free annealed soft copper wires has good flexibility and conductivity, the inner insulating layer 12 is made of HDPE material, the outer insulating layer 13 is made of FRPE material, the inner insulating layer 12 and the outer The insulating layer 13 is double-layer co-extruded on the conductor 11, and the inner insulating layer 12, the outer insulating layer 13 and the conductor 11 are coaxially arranged. HDPE has good electrical insulation and dielectric strength. After the inner insulating layer 12 of HDPE material is coated on the conductor 11, it can withstand a large electric field strength without breakdown, thereby improving the protection of the conductor 11. FRPE has certain flame retardant properties and can effectively prevent the spread of flames in the event of a fire. The inner insulating layer 12 and the outer insulating layer 13 of the same insulating core wire 1 are the same color, and the inner insulating layer 12 and the outer insulating layer 13 of different insulating core wires 1 are different. Color, every two insulated core wires 1 are twisted into a pair of twisted wires, which is convenient for the staff to select the correct insulated core wire 1 by color when connecting the equipment, and can also correctly match the insulated core wire 1 according to the color of the insulating layer when replacing the damaged cable after a fire. A fire-resistant layer 3 is wrapped around the twisted wire, and the fire-resistant layer 3 is two layers of mica tape arranged for wrapping. The mica tape has high fire resistance and can remain stable at high temperatures, thereby protecting the insulated core wire 1 in the twisted wire from damage. Wrapping two layers of mica tape can further improve the protection of the insulated core wire 1. The two layers of mica tape The wrapping directions of the tapes 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 tapes can enhance the mechanical strength of the twisted pair. When external forces act on the twisted pair, the two layers of mica tapes in different directions can better disperse the pressure and reduce the force directly acting on the insulated core wire 1 in the twisted pair, thereby protecting the insulated core wire 1 in the twisted pair. Maintaining the overlap rate between 45% and 50% can prevent the mica tape from causing structural damage due to expansion or contraction of the material at high temperatures, thereby maintaining the overall integrity of the twisted pair.
[0017] 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 meets 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 wire. The flame-retardant cross skeleton 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 skeleton 2 made of HDPE material has good wear resistance, toughness and electrical insulation, it is also flammable and easy to continue to burn in a fire. After aluminum hydroxide particles are mixed in PE, the flame retardant properties of aluminum hydroxide can be used to suppress the flammability of HDPE. A water-blocking rope 21 is filled in the center of the flame retardant cross skeleton 2, 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, and the twisting 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.
[0018] A first glass cloth tape layer 7 is wrapped around the flame retardant cross frame 2. The first glass cloth tape layer 7 fixes four sets of twisted wires in four grooves of the flame retardant cross frame 2. An oxygen barrier layer 5 is extruded on the first glass cloth tape layer 7. The oxygen barrier layer 5 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. The thickness of the oxygen barrier layer 5 is between 1mm and 2mm. The oxygen barrier layer 5 is made of the same material as the flame retardant cross frame 2, so that the production cost can be reduced. A second glass cloth tape layer 8 is wrapped on the layer 5, and the wrapping direction of the second glass cloth tape layer 8 is opposite to the wrapping direction of the first glass cloth tape layer 7. A flame retardant sheath 6 is extruded on the second glass cloth tape layer 8. The flame retardant sheath 6 is made of a halogen-free cross-linked polyethylene material. The cross-linked polyethylene material can slow down the spread of flames. The halogen-free cross-linked polyethylene material does not produce harmful halogen gas when burning, which reduces the harm to the environment and human body, and helps to improve the visibility of the fire scene and increase the probability of escape.
[0019] When a fire occurs, if the flame is small or the flame is far away from the cable, the flame retardant sheath 6 in the cable will play a flame retardant role to extinguish the small flame, prevent the flame from spreading on the flame retardant sheath 6, 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 6 will not be able to withstand the burning and will be burned through. At this time, the aluminum hydroxide particles in the oxygen-isolating layer 5 and the flame-retardant cross skeleton 2 will decompose and release crystal water after being subjected to high-temperature radiation. The decomposed aluminum oxide protective layer, aluminum oxide is non-flammable and has a high melting point. The aluminum oxide protective layer can isolate oxygen and heat to prevent the fire from spreading. The released crystal water can, on the one hand, reduce the temperature inside the cable, and on the other hand, evaporate to form water vapor when in contact with the flame, diluting the oxygen in the cable and reducing the spread of the flame into the cable. The mica tape in the fire-resistant layer 3 is at high The warm environment protects the twisted wires, so that the insulated core wire 1 in the twisted wire can maintain stable communication capabilities during a fire. After the aluminum hydroxide particles in the oxygen-isolating layer 5 release the crystallization water, due to the obstruction of the first glass cloth tape layer 7, the crystallization water will be heated between the first glass cloth tape layer 7 and the second glass cloth tape layer 8 to form water vapor, diluting the oxygen between the first glass cloth tape layer 7 and the second glass cloth tape layer 8, thereby achieving a flame retardant effect. 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 to compress and wrap around the twisted wire so that the insulated core wire 1 in the twisted wire 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 achieving 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.
[0020] 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. Highly flame retardant and fire resistant non-shielded data cable, characterized by: include: Insulated core wire, flame retardant cross skeleton, fire resistant layer, water blocking layer, oxygen insulation layer and flame retardant sheath, 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 first glass cloth tape layer is wrapped on the flame retardant cross skeleton, an oxygen insulation layer is extruded on the first glass cloth tape layer, a second glass cloth tape layer is wrapped on the oxygen insulation layer, and a flame retardant sheath is extruded on the second glass cloth tape layer.
2. The highly flame-retardant and fire-resistant non-shielded data cable according to claim 1, characterized in that: The flame retardant cross frame is made by injection molding by mixing HDPE material with aluminum hydroxide particles, and the particle size of the aluminum hydroxide particles is less than 2μm.
3. The highly flame-retardant and fire-resistant non-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, and the thickness of the oxygen barrier layer is between 1mm and 2mm.
4. The highly flame-retardant and fire-resistant non-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.
5. The highly flame-retardant and fire-resistant non-shielded data cable according to claim 1, characterized in that: The insulated core wire includes: a conductor, an inner insulation layer and an outer insulation layer. The conductor is twisted with 23 / 24AWG oxygen-free annealed soft copper wire. The inner insulation layer is made of HDPE material, and the outer insulation layer is made of FRPE material. The inner insulation layer and the outer insulation layer are double-extruded and wrapped on the conductor. The inner insulation layer, the outer insulation layer and the conductor are coaxially arranged.
6. The highly flame-retardant and fire-resistant non-shielded data cable according to claim 5, characterized in that: The inner insulation layer and outer insulation layer of the same insulating core wire are of the same color, while the inner insulation layer and outer insulation layer of different insulating core wires are of different colors.
7. The highly flame-retardant and fire-resistant non-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 highly flame-retardant and fire-resistant non-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 highly flame-retardant and fire-resistant non-shielded data cable according to claim 1, characterized in that: The flame retardant sheath is made of halogen-free cross-linked polyethylene material.