CN204966129U - Programme -controlled communication data cable of fire -retardant type with fire -resistant function - Google Patents

Abstract

The utility model discloses a flame-retardant program-controlled communication data cable with a fire-resistant function, which comprises: four twisted wire units composed of four twisted wire pairs, and the four twisted wire units are respectively the first twisted wire unit, the second twisted wire unit, and the second twisted wire unit. The twisted wire unit, the third twisted wire unit and the fourth twisted wire unit; the first twisted wire unit, the second twisted wire unit, the third twisted wire unit and the fourth twisted wire unit are all composed of the first twisted wire pair arranged counterclockwise , the second twisted pair, the third twisted pair and the fourth twisted pair are formed by twisting, a low-smoke halogen-free sheath layer is coated on the outer surface of the braided copper wire, and a copper wire used as a drain wire Located between the mica composite tape and the braided copper wire; the low-smoke halogen-free sheath layer has several polypropylene filling ropes, and the polypropylene filling ropes are distributed at least 4 raised parts. The symmetrical cable of the utility model reduces the crosstalk interference at the near end of the cable, improves the defense against the crosstalk at the far end of the cable, improves the tensile strength, and also has the functions of dispersing and buffering external stress, and has better mechanical properties.

Description

Flame-retardant program-controlled communication data cable with fire-resistant function

technical field

The utility model relates to a communication data cable, in particular to a flame-retardant program-controlled communication data cable with a fire-resistant function.

Background technique

With the rapid development of my country's economy, my country's high-rise buildings, subways, nuclear power plants, shipbuilding, optoelectronic communications, etc. are developing at an unprecedented speed, and the consumption of wires and cables has also increased rapidly. With the rapid development of contemporary program-controlled switching technology, program-controlled communication lines are required to be digitalized, high-capacity, and wide-band, and with the optimization of system equipment in program-controlled switching areas or rooms, the electromagnetic interference caused by the lines is correspondingly intensified. This type of cable product has the characteristics of electromagnetic compatibility, and according to the regulations of the relevant security technical specifications, this type of cable is required to have high flame retardancy. Therefore, according to the above requirements and characteristics, we focus on optimizing the design of the cable structure to improve the performance indicators of existing products.

Contents of the invention

The utility model provides a flame-retardant program-controlled communication data cable with a fire-resistant function. The flame-retardant program-controlled communication data cable reduces cable near-end crosstalk interference and improves cable far-end crosstalk defense. It not only improves the tensile strength, It also has the function of dispersing and buffering external stress, and its mechanical properties are better.

In order to achieve the above purpose, the technical solution adopted by the utility model is: a flame-retardant program-controlled communication data cable with fire-resistant function, including: four twisted wire units composed of four twisted wire pairs, the four twisted wire units They are the first stranded wire unit, the second stranded wire unit, the third stranded wire unit and the fourth stranded wire unit, wherein the pitch of the first and third stranded wire units is 125~130mm, and the pitch of the second and fourth stranded wire units The pitch of the line units is 140~145mm; a mica composite tape is wrapped on the outer surface of the four stranded wire units, a copper wire braid is wrapped on the outer surface of the mica composite tape, a low-smoke halogen-free sheath layer Coated on the outer surface of the braided copper wire, a copper wire used as a drain wire is located between the mica composite tape and the braided copper wire; the low-smoke halogen-free sheath has several polypropylene-filled Rope, the polypropylene filled rope has at least 4 protruding portions distributed at equal intervals along the circumference on its outer surface, the first strand unit, the second strand unit, the third strand unit and the fourth strand unit The units are all formed by twisting the first twisted pair, the second twisted pair, the third twisted pair and the fourth twisted pair arranged counterclockwise, the pitch of the first twisted pair is 15.5 mm, and the The pitch of the second twisted pair is 19.0 mm, the pitch of the third twisted pair is 13.5 mm, and the pitch of the fourth twisted pair is 22.5 mm.

Above-mentioned technical scheme further improves technical scheme as follows:

1. In the above solution, the number of protrusions on the outer surface of the polypropylene filling rope is five.

2. In the above solution, the twisted wire pair is formed by twisting two copper conductors coated with a tin layer.

Due to the application of the above-mentioned technical solutions, the utility model has the following advantages compared with the prior art:

The utility model is a flame-retardant program-controlled communication data cable with a fire-resistant function. Its four twisted wire units adopt a combination of specific twisted pair pitches, and the cable pitch is reasonably designed. Symmetrical cables reduce crosstalk interference at the near end of the cable and improve The degree of crosstalk defense improves the quality of cable transmission signals, thus adapting to the broadband and digital transmission requirements in program-controlled switching communication systems; secondly, it improves the quality of signal transmission, and maximizes the flame-retardant and fire-resistant properties of cables and reduces isotropy For the purpose of external electromagnetic interference and digital transmission, the effective transmission distance of the line has also been expanded to a certain extent; thirdly, the polypropylene filling rope has at least 4 protrusions distributed at equal intervals along the circumferential direction on its outer surface, which not only improves the tensile strength , It also has the function of dispersing and buffering external stress, and its mechanical properties are better.

Description of drawings

Accompanying drawing 1 is the structural diagram of the flame-retardant program-controlled communication data cable with fire-resistant function of the utility model.

In the above drawings: 1, twisted wire pair; 2, twisted wire unit; 3, first twisted wire unit; 4, second twisted wire unit; 5, third twisted wire unit; 6, fourth twisted wire unit; 7 , mica composite tape; 8, copper wire braiding layer; 9, low-smoke halogen-free sheath layer; 10, copper wire; 11, tin layer; 12, copper conductor; 13, polypropylene filling rope; 14, raised part; 15. The first twisted pair; 16. The second twisted pair; 17. The third twisted pair; 18. The fourth twisted pair.

detailed description

Below in conjunction with accompanying drawing and embodiment the utility model is further described:

Embodiment 1: A flame-retardant program-controlled communication data cable with fire-resistant function, including: four twisted wire units 2 composed of four twisted wire pairs 1, and the four twisted wire units 2 are respectively the first twisted wire units 3. The second stranding unit 4, the third stranding unit 5 and the fourth stranding unit 6, wherein the pitch of the first and third stranding units 3 and 5 is 125mm, and the second and fourth stranding units The pitch of 4 and 6 is 142 mm; a mica composite tape 7 is wrapped around the outer surfaces of the four twisted wire units 2, a copper wire braid 8 is wrapped on the outer surface of the mica composite tape 7, and a low-smoke and halogen-free The sheath layer 9 is covered on the outer surface of the copper wire braided layer 8, and a copper wire 10 as a drain wire is located between the mica composite tape 7 and the copper wire braided layer 8; the low-smoke halogen-free sheath There are several polypropylene filling ropes 13 in the layer 9, and the outer surface of the polypropylene filling rope 13 is distributed with at least 4 protrusions 14 at equal intervals in the circumferential direction. The first strand unit 3, the second strand unit The wire unit 4, the third twisted wire unit 5 and the fourth twisted wire unit 6 are all composed of the first twisted pair 15, the second twisted pair 16, the third twisted pair 17 and the fourth twisted pair 18 arranged counterclockwise. Twisted to form, the pitch of the first twisted pair 15 is 15.5mm, the pitch of the second twisted pair 16 is 19.0mm, and the pitch of the third twisted pair 17 is 13.5mm, so The pitch of the fourth twisted wire pair 18 is 22.5 mm.

The number of protrusions 14 on the outer surface of the above-mentioned polypropylene filling rope 13 is five.

Embodiment 2: A flame-retardant program-controlled communication data cable with fire-resistant function, including: four twisted wire units 2 composed of four twisted wire pairs 1, and the four twisted wire units 2 are respectively the first twisted wire units 3. The second stranding unit 4, the third stranding unit 5 and the fourth stranding unit 6, wherein the pitch of the first and third stranding units 3 and 5 is 130mm, and the second and fourth stranding units The pitch of 4 and 6 is 145mm; a mica composite tape 7 is wrapped around the outer surfaces of the four twisted wire units 2, a copper wire braid 8 is wrapped on the outer surface of the mica composite tape 7, and a low-smoke and halogen-free The sheath layer 9 is covered on the outer surface of the copper wire braided layer 8, and a copper wire 10 as a drain wire is located between the mica composite tape 7 and the copper wire braided layer 8; the low-smoke halogen-free sheath There are several polypropylene filling ropes 13 in the layer 9, and the outer surface of the polypropylene filling rope 13 is distributed with at least 4 protrusions 14 at equal intervals in the circumferential direction. The first strand unit 3, the second strand unit The wire unit 4, the third twisted wire unit 5 and the fourth twisted wire unit 6 are all composed of the first twisted pair 15, the second twisted pair 16, the third twisted pair 17 and the fourth twisted pair 18 arranged counterclockwise. Twisted to form, the pitch of the first twisted pair 15 is 15.5mm, the pitch of the second twisted pair 16 is 19.0mm, and the pitch of the third twisted pair 17 is 13.5mm, so The pitch of the fourth twisted wire pair 18 is 22.5 mm.

The twisted wire pair 1 is formed by twisting two copper conductors 12 coated with a tin layer 11 .

Technical indicators of the above-mentioned mica composite tape:

Applicable fire resistance range: 800～1000℃;

Tensile strength: ≥75N/cm;

Dielectric strength: ≥9.5Kv/mm;

During the cable production process, materials, equipment, tooling, etc. are designed and controlled scientifically and reasonably, and the core wires of the cable are covered with mica-aluminum foil composite tape, and braided with multiple strands of tinned braided wire.

The total braided layer cable core is sheathed with low-smoke halogen-free sheath material with an oxygen index of 38%. Insulation shrinkage test: ≤5% (treatment temperature: 232±2°C, treatment for 1 hour), product testing: yes The electrical performance of the product is tested and evaluated. Monitor the running status of the product in the application system.

When the above-mentioned flame-retardant program-controlled communication data cable with fire-resistant function is used, the four twisted wire units adopt a specific pair pitch combination, and the cable pitch is reasonably designed. The symmetrical cable reduces the crosstalk interference at the near end of the cable and improves the far end The degree of crosstalk defense improves the quality of cable transmission signals, thus adapting to the broadband and digital transmission requirements in program-controlled switching communication systems; secondly, it improves the quality of signal transmission, and maximizes the flame-retardant and fire-resistant properties of cables and reduces isotropy For the purpose of external electromagnetic interference and digital transmission, the effective transmission distance of the line has also been expanded to a certain extent; thirdly, the polypropylene filling rope has at least 4 protrusions distributed at equal intervals along the circumferential direction on its outer surface, which not only improves the tensile strength , It also has the function of dispersing and buffering external stress, and its mechanical properties are better.

The above-mentioned embodiments are only to illustrate the technical concept and characteristics of the present utility model, and its purpose is to enable those familiar with this technology to understand the content of the present utility model and implement it accordingly, and not to limit the protection scope of the present utility model. All equivalent changes or modifications made according to the spirit of the utility model shall fall within the protection scope of the utility model.

Claims (3)

1. A flame-retardant program-controlled communication data cable with fire-resistant function, characterized in that it includes: four twisted wire units (2) composed of four twisted wire pairs (1), the four twisted wire units (2 ) are respectively the first stranding unit (3), the second stranding unit (4), the third stranding unit (5) and the fourth stranding unit (6), wherein the first and third stranding units ( The pitch of 3, 5) is 125~130mm, the pitch of the second and fourth stranded wire units (4, 6) is 140~145mm; a mica composite tape (7) is wrapped around these four stranded wire units ( 2) Outer surface, a copper wire braiding layer (8) is coated on the outer surface of the mica composite tape (7), and a low-smoke halogen-free sheath layer (9) is coated on the copper wire braiding layer (8) On the outer surface, a copper wire (10) as a drain wire is located between the mica composite tape (7) and the copper wire braid (8); the low-smoke halogen-free sheath layer (9) has several The polypropylene filling rope (13), the polypropylene filling rope (13) has at least 4 protrusions (14) distributed at equal intervals along the circumferential direction on its outer surface, the first stranded wire unit (3), the second The second twisted wire unit (4), the third twisted wire unit (5) and the fourth twisted wire unit (6) are composed of the first twisted wire pair (15), the second twisted wire pair (16), the Three twisted wire pairs (17) and the fourth twisted wire pair (18) are formed by twisting, the pitch of the first twisted wire pair (15) is 15.5 mm, and the pitch of the second twisted wire pair (16) is 19.0 mm, the pitch of the third twisted wire pair (17) is 13.5 mm, and the pitch of the fourth twisted wire pair (18) is 22.5 mm. 2. The fire-resistant flame-retardant program-controlled communication data cable according to claim 1, characterized in that: the number of protrusions (14) on the outer surface of the polypropylene filling rope (13) is five. 3. The fire-resistant flame-retardant program-controlled communication data cable according to claim 1, characterized in that: the twisted wire pair (1) consists of two copper conductors (12) coated with a tin layer (11) Stranded to form.