Double-shielding high-transmission data cable

Abstract

The utility model discloses a double-shielding high transmission data cable, including: insulating core wire, buffer hose, aluminum plastic composite tape, ground wire, metal braid layer and sheath, insulating core wire is formed by three insulating layer co-extrusion on the conductor, every two insulating core wire pair twist to form one group of twisted pair wire, each group of twisted pair wire is lapped with aluminum plastic composite tape, the metal braid layer is lapped with the buffer hose, the metal braid layer is lapped with the metal braid layer, the metal braid layer is lapped with the metal braid layer, and the metal braid layer is lapped with the metal braid layer. The four groups of twisted pair wires are twisted into a cable by taking the ground wire as a center, a metal braided layer is braided on the four groups of twisted pair wires which form the cable, an aluminum foil layer on an aluminum-plastic composite belt is in contact with the metal braided layer and the ground wire, a buffer hose is spirally wound on the metal braided layer at equal intervals, and the buffer hose is formed by mixing and extruding a PVC material and aluminum hydroxide particles. And a sheath is extruded on the metal braid layer, is filled in the gap of the buffer hose and is attached to the metal braid layer. The advantages of the utility model are that the cable can maintain the high-speed and high-reliability transmission performance of data signals in a conventional environment and an environment in which a fire disaster occurs or a building collapses.

Description

Technical Field

[0001] The utility model relates to the field of cables, in particular to a double-shielded high-transmission data cable. Background Art

[0002] With the development of communication technology, the amount of data transmission is increasing, and the requirements for data transmission speed are getting higher and higher. This requires the use of cables with fast signal transmission speed and good shielding performance to achieve high-speed and high-reliability transmission of data signals. The data cables currently on the market can ensure the transmission of data signals under normal conditions, but in the event of a fire, the sheath and insulation layer of the cable are easily ignited, and the cable will quickly lose its insulation ability, increasing the risk of short circuits, and even causing the cable to spontaneously combust due to short circuits. In the event of building collapse, the cable is easily physically damaged, and the insulation and shielding layers of the cable are easily broken or bent, which will affect the signal transmission and shielding capabilities of the cable. Utility Model Content

[0003] The purpose of the utility model is to provide a double-shielded high-transmission data cable, which can not only maintain the high-speed and high-reliability transmission performance of data signals in conventional environments, but also maintain the high-speed and high-reliability transmission performance of data signals in extreme environments such as fire or building collapse.

[0004] In order to achieve the above-mentioned purpose, the technical scheme adopted by the utility model is: a double-shielded high-transmission data cable, including: an insulating core wire, a buffer hose, an aluminum-plastic composite tape, a ground wire, a metal braided layer and a sheath, the insulating core wire is co-extruded on the conductor by three layers of insulating layers, every two insulating core wires are twisted to form a group of twisted wires, and an aluminum-plastic composite tape is wrapped around each group of twisted wires. Four groups of twisted wires are twisted into a cable with the ground wire as the center, and a metal braided layer is woven on the four groups of twisted wires in the cable. The aluminum foil layer on the aluminum-plastic composite tape is in contact with the metal braided layer and the ground wire, and a buffer hose is equidistantly spirally wound on the metal braided layer. The buffer hose is extruded after mixing PVC material and aluminum hydroxide particles, and a sheath is extruded on the metal braided layer. The sheath fills the gap in the buffer hose and is attached to the metal braided layer.

[0005] Furthermore, in the aforementioned double-shielded high-transmission data cable, a water-blocking rope is filled in the gap between the two insulated core wires in each set of twisted pairs.

[0006] Furthermore, in the aforementioned double-shielded high-transmission data cable, the particle size of the aluminum oxide particles is less than 2 μm.

[0007] Furthermore, in the aforementioned double-shielded high-transmission data cable, the conductor is formed by twisting 23 / 24AWG oxygen-free annealed soft copper wires, and the diameter of the conductor is 0.58±0.01mm.

[0008] Furthermore, in the aforementioned double-shielded high-transmission data cable, the three insulating layers include: a low-density polyolefin layer, a high-density polyolefin layer and a foamed polyolefin layer, the low-density polyolefin layer is directly coated on the conductor, the foamed polyolefin layer is coated on the low-density polyolefin layer, and the high-density polyolefin layer is coated on the foamed polyolefin layer. The three insulating layers of the same insulating core wire have the same color, and the three insulating layers of different insulating core wires have different colors.

[0009] Furthermore, in the aforementioned double-shielded high-transmission data cable, the metal braided layer is woven from eight tinned copper wires with a diameter of 0.08 mm, and the braiding density is ≥90%.

[0010] Furthermore, in the aforementioned double-shielded high-transmission data cable, the sheath is made of a halogen-free cross-linked polyethylene material.

[0011] Furthermore, in the aforementioned double-shielded high-transmission data cable, the outer diameter of the sheath is less than 7 mm, and the thickness of the sheath is not less than 1.8 mm.

[0012] Furthermore, in the aforementioned double-shielded high-transmission data cable, the twisting pitches of the four twisted pairs are different and not a multiple, and the twisting pitches of the four twisted pairs when twisted into a cable are different from the twisting pitches of each twisted pair and are not a multiple.

[0013] The advantages of the utility model are: the three-layer insulation layer can help reduce signal attenuation, achieve a longer transmission distance, and achieve stable and high-speed transmission of data signals. Under the shielding effect of the aluminum-plastic composite tape, it can prevent interference from external signals and signal crosstalk between the four twisted pairs inside the cable. After the metal braided layer and the ground wire are in contact with the aluminum foil layer on the aluminum-plastic composite tape on the four twisted pairs, the interference current can be effectively guided to flow directly to the grounding point instead of flowing through other sensitive circuit parts, which helps to reduce the impact of electromagnetic interference on the performance of the equipment connected to the cable, thereby improving the electromagnetic compatibility of the system and further reducing external signal The buffer hose can reduce the interference of the signal to the inside of the cable; in the event of a fire, the aluminum peroxide particles in the buffer hose will decompose due to heat and release crystalline water, which will play a certain flame retardant role. Together with the metal braided layer, it can further reduce the impact of the flame on the insulated core wire, ensuring that the cable can maintain good signal transmission capabilities in a fire environment, and the buffer hose will reduce the probability of damage to the metal braided layer when it is flame retardant, so that it can maintain its shielding effect; when the cable is subjected to external forces, the buffer hose can play a buffering role to protect the metal braided layer from damage, and the foamed polyolefin layer in the three-layer insulation layer can also play a buffering role to reduce the probability of damage to the three-layer insulation layer and the conductor. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1It is a structural schematic diagram of the double-shielded high-transmission data cable described in the utility model.

[0015] Figure 2 yes Figure 1 Schematic diagram of the connection structure between the metal braid layer, buffer hose and sheath. 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 2 As shown, the double-shielded high-transmission data cable includes: an insulating core wire 1, a buffer hose 2, an aluminum-plastic composite tape 3, a ground wire 4, a metal braided layer 5 and a sheath 6. The insulating core wire 1 is co-extruded on a conductor 11 by three insulating layers. The diameter of the conductor 11 is about 0.58±0.01mm, and it is twisted by 23 / 24AWG oxygen-free annealed soft copper wires. The conductor 11 of this diameter helps to improve the quality and stability of signal transmission. The three insulating layers include: a low-density polyolefin layer 12, a high-density polyolefin layer 14 and a foamed polyolefin layer 13. The low-density polyolefin layer 12 is directly coated on the conductor 11, the foamed polyolefin layer 13 is coated on the low-density polyolefin layer 12, and the high-density polyolefin layer 14 is coated on the foamed polyolefin layer 13. The low-density polyolefin layer 12 has good electrical insulation performance and environmental stress cracking resistance. It is directly coated on the conductor 11 to effectively protect the conductor 11, prevent current leakage, and prevent cracking. Compared with low-density polyolefin, the polyolefin layer 14 has better wear resistance, tensile strength and creep resistance. The combination of the two can not only play a good electrical insulation performance, but also ensure high mechanical properties. The foamed polyolefin layer 13 has the advantages of good flexibility and low dielectric constant, which reduces the transmission resistance of electromagnetic waves, improves the signal transmission speed and efficiency of the conductor 11, and facilitates the bending of cables for wiring. The three-layer co-extruded insulation structure can not only improve the coaxiality between the layers, but also make the layers closely combined together, increase the starting free discharge voltage, and thus enhance the electrical performance of the cable. The three layers of insulation of the same insulating core wire 1 are the same color, and the three layers of insulation between different insulating core wires 1 are different in color. This makes it convenient for staff to select the correct insulating core wire 1 for connection by color when connecting equipment, and when the damaged cable needs to be replaced after a fire, it can also be correctly matched according to the color of the insulating layer on the insulating core wire 1.

[0018] Every two insulated core wires 1 are twisted to form a group of twisted wires. The gap between the two insulated core wires 1 in each group of twisted wires is filled with a water-blocking rope 7. An aluminum-plastic composite tape 3 is wrapped around each group of twisted wires. The aluminum-plastic composite tape 3 can not only tighten the two twisted insulated core wires 1, but also play a shielding role. The four groups of twisted wires are twisted into a cable with the ground wire 4 as the center. The twisting pitches of the four groups of twisted wires are different and not a multiple. The twisting pitches of the four groups of twisted wires when twisted into a cable are different from the twisting pitches of each twisted wire pair and are not a multiple, which can prevent signal resonance between the twisted wires, thereby ensuring the stability and clarity of signal transmission. A metal braided layer 5 is woven on the four groups of twisted wires in the cable. The metal braided layer is woven from eight tinned copper wires with a diameter of 0.08mm, and the braiding density is ≥90%, which can effectively shield the electromagnetic interference of the outer diameter and ensure the inner wall of the cable Stable signal transmission, the aluminum foil layer on the aluminum-plastic composite tape 3 is in contact with the metal braided layer 5 and the ground wire 4, and a buffer hose 2 is equidistantly spirally wound on the metal braided layer 5. The buffer hose 2 is extruded after mixing PVC material and aluminum hydroxide particles. The particle size of the aluminum hydroxide particles is less than 2μm. A sheath 6 is extruded on the metal braided layer 5. The sheath 6 fills the gap in the buffer hose 2 and is attached to the metal braided layer 5. The sheath 6 is made of halogen-free cross-linked polyethylene material. The cross-linked polyethylene material can adhere to the metal braided layer 5 during extrusion to improve the integrity of the cable. The cross-linked polyethylene material can slow down the spread of flames, 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 increase the probability of escape. In this embodiment, the outer diameter of the sheath 6 is less than 7 mm, indicating that the overall diameter of the cable is controlled below 7 mm. Cables with a diameter below 7 mm can be flexibly wired in a limited space during installation, which is convenient for installation. The thickness of the sheath 6 is not less than 1.8 mm. With sufficient thickness, the sheath 6 can effectively prevent the intrusion of external moisture and chemicals, protect the internal units of the cable, and withstand various physical forces to reduce damage to the internal components of the cable by external forces.

[0019] The conductor 11 with a diameter of 0.58±0.01mm can ensure that the signal transmission rate of the insulated core wire 1 is high and the signal quality is stable. The conductor 11 in the insulated core wire 1 helps to reduce signal attenuation under the protection of three layers of insulation layers, achieve a longer signal transmission distance, and maintain good communication capabilities in high temperature and corrosive environments. A layer of aluminum-plastic composite tape 3 is wrapped around each set of twisted pairs, and the aluminum-plastic composite tape 3 shields the twisted pairs. The metal braided layer 5 shields the cables as a whole. The aluminum foil layer on the aluminum-plastic composite tape 3 can form a conductive layer after contacting the metal braided layer 5, and the aluminum-plastic composite tape 3 is connected to the ground wire 4 through its own aluminum foil layer. In this way, the interference current can be effectively guided to flow directly to the grounding point instead of flowing through other sensitive circuit parts, which helps to reduce the impact of electromagnetic interference on the performance of equipment connected to the cable, thereby improving the electromagnetic compatibility of the system, effectively reducing the interference of external signals on the inside of the cable, and preventing the signal inside the cable from leaking into the external environment.

[0020] In the event of a fire, the sheath 6 made of halogen-free cross-linked polyethylene material can play a flame retardant role, and the aluminum hydroxide particles in the buffer hose 2 will decompose after being exposed to high temperature to form non-flammable, high-melting point aluminum oxide, and will also release crystal water. The aluminum oxide will isolate the flame to a certain extent, and the crystal water can reduce the temperature of the inner wall of the cable on the one hand, and on the other hand, it will evaporate to form water vapor when encountering high temperature or flame, diluting the oxygen in the cable and reducing the spread of the fire. The metal braided layer 5 can reduce the probability of damage under the cooling and flame retardant effect of the crystal water and maintain the shielding function. If the crystal water does not evaporate in time or when the cable encounters water during the fire extinguishing process, the water-blocking rope 7 in the twisted pair will absorb water and expand to play a water-blocking role on the insulated core wire 1 in the twisted pair, thereby ensuring that the cable has stable communication performance. The aluminum hydroxide particles in the buffer hose 2 will not affect the hardness of the buffer hose 2 after being decomposed by heat. When the cable is squeezed or collided, the buffer hose 2 is impacted before the metal braided layer 5. After being impacted, the buffer hose 2 will deform and play a buffering role, thereby reducing the damage of the external impact force to the metal braided layer 5. The foamed polyolefin layer 13 in the three-layer insulation layer will form many air pockets inside due to foaming, which not only can insulate, but also can play a buffering role, so that the cable can also play a buffering role when subjected to external impact force, thereby reducing the probability of damage to the three-layer insulation layer and the conductor 11.

[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. Double shielded high transmission data cable, characterized by: include: Insulated core wire, buffer hose, aluminum-plastic composite tape, ground wire, metal braided layer and sheath. The insulated core wire is co-extruded on the conductor with three layers of insulation layers. Every two insulated core wires are twisted to form a group of twisted wires. Each group of twisted wires is wrapped with aluminum-plastic composite tape. Four groups of twisted wires are twisted into a cable with the ground wire as the center. A metal braided layer is woven on the four groups of twisted wires in the cable. The aluminum foil layer on the aluminum-plastic composite tape is in contact with the metal braided layer and the ground wire. A buffer hose is equidistantly spirally wound on the metal braided layer. The buffer hose is extruded after mixing PVC material with aluminum hydroxide particles. A sheath is extruded on the metal braided layer. The sheath fills the gaps in the buffer hose and is attached to the metal braided layer.

2. The double-shielded high-transmission data cable according to claim 1, characterized in that: The space between the two insulated core wires in each set of twisted pairs is filled with a water-blocking rope.

3. The double-shielded high-transmission data cable according to claim 1, characterized in that: The particle size of the aluminum oxide particles is less than 2 μm.

4. The double-shielded high-transmission data cable according to claim 1, characterized in that: The conductor is made of 23 / 24AWG oxygen-free annealed soft copper wire, and the diameter of the conductor is 0.58±0.01mm.

5. The double-shielded high-transmission data cable according to claim 1, characterized in that: The three-layer insulation layer includes: a low-density polyolefin layer, a high-density polyolefin layer and a foamed polyolefin layer. The low-density polyolefin layer is directly coated on the conductor, the foamed polyolefin layer is coated on the low-density polyolefin layer, and the high-density polyolefin layer is coated on the foamed polyolefin layer. The three layers of insulation layers of the same insulating core wire are of the same color, and the three layers of insulation layers of different insulating core wires have different colors.

6. The double-shielded high-transmission data cable according to claim 1, characterized in that: The metal braided layer is woven from eight tinned copper wires with a diameter of 0.08 mm, and the braiding density is ≥ 90%.

7. The double-shielded high-transmission data cable according to claim 1, characterized in that: The sheath is made of halogen-free cross-linked polyethylene material.

8. The double-shielded high-transmission data cable according to claim 1, characterized in that: The outer diameter of the sheath is less than 7 mm, and the thickness of the sheath is not less than 1.8 mm.

9. The double-shielded high-transmission data cable according to claim 1, characterized in that: The twisting pitches of the four twisted pairs are all different and not a multiple of each other. The twisting pitches of the four twisted pairs when twisted into a cable are all different and not a multiple of each other.

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