CN105405514B - The low-loss composite data cable of high shielding properties - Google Patents

Abstract

The present invention discloses a kind of low-loss composite data cable of high shielding properties, including：Steel conductor, coaxial conductor, eight copper conductors and oversheath body；Eight copper conductors are twisted two-by-two forms four pairs of twisted wires pair as information communication；Oversheath body includes the first sub- sheath, the second sub- sheath and the 3rd sub- sheath, there is " people " font connecting portion at this first sub- sheath, the second sub- sheath and the 3rd sub- sheath center, first sub- sheath is coated on the steel conductor outside surfaces, second sub- sheath is coated on the first inner restrictive coating outer surface, and the 3rd sub- sheath is coated on the second inner restrictive coating outer surface；Some plain conductors are spaced, and for plain conductor one ends wound in the steel conductive surface, the plain conductor other end is electrically connected to the proof copper-wire braided screen layer.The present invention greatly reduces the cross-talk of the communications cable, reduces mutual capacitively coupled, while has taken into account other electric parameters, it also avoid the increase of electric signal delay inequality.

Description

Low-loss composite data cable with high shielding performance

technical field

The invention relates to a communication cable, in particular to a low-loss composite data cable with high shielding performance.

Background technique

Worldwide, China has become the world's largest producer and consumer of wire and cable. With the rapid development of digital technology, computers are not only widely used in various industrial facilities, but also widely popularized in various offices and even residential buildings. The continuous expansion and extension of computer networks, as well as the sharp increase in the amount of transmitted information, on the one hand, have increased the amount of data cables used for network deployment by a large margin; on the other hand, data cables have been required to have higher transmission speed and wider transmission. bandwidth to achieve fast and accurate transmission of information. Its transmission speed range has also developed from 10Mbps to 10000Mbps, and it is foreseeable that due to the increasing traffic, the network speed will greatly exceed 1000Mbps in the near future, which urgently requires people to provide a data cable with better electrical performance; The structure of ordinary single-type communication cables: the main structure of the cable with twisted structure is that the copper conductor is extruded with a layer of insulation. The inner conductor is extruded or wrapped with a layer of insulation, and then aluminum foil or braid is used as the outer conductor and polyolefin is used as the outer sheath. Due to the above-mentioned structural limitations of the communication cable, in the outdoor decoration distribution system and automatic detection system, it will cause The stretch is large, the quality is unstable, the wiring is cumbersome, and it is unreliable and affects the performance.

Contents of the invention

The invention provides a low-loss composite data cable with high shielding performance. The low-loss composite data cable further reduces the crosstalk and electrical signal delay difference of the communication cable, avoids the power loss of the signal, and improves the signal quality. Stability of power and performance.

In order to achieve the above object, the technical solution adopted by the present invention is: a low-loss composite data cable with high shielding performance, including: steel conductors, coaxial conductors, eight copper wires coated with polyethylene layers and outer sheaths body; the outer surface of the coaxial conductor is covered with a plastic insulating layer, the outer surface of the plastic insulating layer is covered with a first metal braiding layer, and the first inner sheath layer is wrapped on the outer surface of the first metal braiding layer;

The eight copper wires are twisted in pairs to form four pairs as twisted wire pairs for information communication. Among the four twisted wire pairs, the first twisted pair, the second twisted pair, the third twisted pair and the fourth twisted pair The wire pairs are arranged counterclockwise and twisted to form a conductive cable core. The first twisted pair and the third twisted pair are arranged alternately with the second twisted pair and the fourth twisted pair. The outer surfaces of the four twisted pairs are respectively Both are covered with an aluminum foil shielding layer, a polyester tape is wrapped on the outer surface of the aluminum foil shielding layer, and a second inner sheath layer is wrapped on the outer surface of the polyester tape;

The outer sheath body includes a first sub-sheath, a second sub-sheath and a third sub-sheath, and there is a "person" in the center of the first sub-sheath, the second sub-sheath and the third sub-sheath A font connecting part, the first connecting rib part, the second connecting rib part and the third connecting rib part of this "herringbone" shaped connecting part are respectively connected to the first sub-sheath, the second sub-sheath and the third sub-sheath. A sub-sheath, the first sub-sheath covers the outer surface of the steel conductor, the second sub-sheath covers the outer surface of the first inner sheath layer, and the third sub-sheath covers the second The outer surface of the inner sheath layer;

Several metal wires are arranged alternately, one end of the metal wire is wound on the surface of the steel conductor, and the other end of the metal wire passes through the first sub-sheath, the first rib part, the third rib part and the third sub-sheath in turn. sleeve and electrically connected to the copper wire braided shielding layer;

The pitch of the first twisted pair is 15-15.5 mm, the pitch of the second twisted pair is 13.5-13.9 mm, the pitch of the third twisted pair is 14.2-14.6 mm, the The pitch of the fourth twisted pair is 12.7~13.1mm;

Adjacent pitch design formula is: 0.002<∣ — ∣≤0.013,

The pitch design formula is: 0.001<∣ — ∣≤0.011;

h1 is the pitch of the first twisted wire pair, h2 is the pitch of the second twisted wire pair or the fourth twisted wire pair, and h3 is the pitch of the third twisted wire pair.

Further improvement technical scheme in above-mentioned technical scheme is as follows:

1. In the above solution, the four twisted wire pairs are twisted to form a conductive cable core, and the twisted pitch of the conductive cable core is 7.7 to 9.8 times the pitch of the fourth twisted wire pair.

2. In the above solution, both the steel conductor and the copper wire are subjected to an annealing process.

3. In the above scheme, the aluminum foil shielding layer is composed of a polyester film layer and an aluminum foil layer located on its inner side, the thickness of the polyester film layer is 0.020±0.002 mm, and the thickness of the aluminum foil layer is 0.014±0.002 mm.

Due to the use of the above-mentioned technical solutions, the present invention has the following advantages compared with the prior art:

1. The low-loss composite data cable with high shielding performance of the present invention not only effectively solves the complex environment of the cable in the construction process, such as the wiring belt of the cable in the power supply and distribution system of the machine room and the power distribution system in the building It will cause a lot of inconvenience. When the cable is running, it will generate a certain electromagnetic field around it, which will interfere with other systems. It not only ensures the self-supporting capacity of the cable, but also solves the problem of mutual interference of the cables during operation, ensures the long-term stability of the transmission characteristics, and has the advantages of convenient emergency maintenance and repeated use. It has obvious economic benefits and popularization Value,, can withstand the test of thermal expansion and contraction of materials when the ambient temperature changes, so the service life of the cable can be extended, it is not easy to be corroded, and the service life is long.

2. The low-loss composite data cable with high shielding performance of the present invention breaks through the traditional circular structure of twisted pairs, and effectively improves the 1% margin of crosstalk (NEXT, FEXT) indicators of communication cables. It even improves the 1dB margin of the loss (INSERTION LOSS), increases the 1.5% stability of the characteristic impedance (IMPEDANCE), and increases the transmission performance of the copper cable while ensuring the stable transmission performance of the cable.

3. The low-loss composite data cable with high shielding performance of the present invention adopts a specific twisted pair wire pitch matching and a specific conductive cable core forming core pitch and twisted pair wire combination, which reduces the generation of transmission electrical signals on its loop. The influence of electromagnetic induction greatly reduces the crosstalk of communication cables. The electric field generated by capacitive induction has positive and negative poles. After the superposition of two adjacent induced electric fields, they can cancel each other out, reducing the mutual capacitive coupling, while taking into account other electrical parameters. It also avoids the increase of the electric signal delay difference.

4. The low-loss composite data cable with high shielding performance of the present invention includes several metal wires arranged alternately, one end of the metal wire is wound on the surface of the steel conductor, and the other end of the metal wire passes through the first sub-sheath in turn , the first connecting rib part, the third connecting rib part and the third sub-sheath are electrically connected to the copper wire braided shielding layer, which reduces the crosstalk of the communication cable and the delay difference of the electrical signal, and avoids the power of the signal Loss and signal reflection back to the transmission source improve the stability of signal power and performance; secondly, it includes several metal wires arranged alternately, one end of the metal wire is wound on the surface of the steel conductor, and the other end of the metal wire passes through the The first sub-sheath, the first rib part, the third rib part and the third sub-sheath are electrically connected to the copper wire braided shielding layer, and the distance between the two adjacent metal wires is the conductive cable core 2.4~3.7 times of the twisting pitch, which further reduces the crosstalk and electrical signal delay difference of the communication cable, avoids the power loss of the signal, and improves the stability of the signal power and performance.

Description of drawings

Accompanying drawing 1 is the low-loss composite data cable structure schematic diagram one of high shielding performance of the present invention;

Accompanying drawing 2 is the partial structure schematic diagram of accompanying drawing 1;

Accompanying drawing 3 is the structural schematic diagram II of the low-loss composite data cable with high shielding performance of the present invention.

In the above drawings: 1. steel conductor; 2. coaxial conductor; 3. copper wire; 31. polyethylene layer; 4. outer sheath body; 41. first sub-sheath; 42. second sub-sheath; 43. The third sub-sheath; 5. Plastic insulating layer; 6. The first metal braiding layer; 7. The first inner sheath layer; 8. Conductive cable core; 81. The first twisted pair; 82. The second twisted Wire pair; 83, third twisted pair; 84, fourth twisted pair; 9, aluminum foil shielding layer; 10, polyester tape; 11, second inner sheath layer; 12, "herringbone"-shaped connection part; 121, the first connecting rib part; 122, the second connecting rib part; 123, the third connecting rib part; 13, the metal wire; 14, the copper wire braided shielding layer; 15, the second metal braiding layer.

detailed description

The present invention will be further described below in conjunction with accompanying drawing and embodiment:

Embodiment 1: A low-loss composite data cable with high shielding performance, comprising: a steel conductor 1, a coaxial conductor 2, eight copper wires 3 coated with a polyethylene layer 31, and an outer sheath 4; The outer surface of the coaxial conductor 2 is covered with a plastic insulating layer 5, the outer surface of the plastic insulating layer 5 is covered with a first metal braiding layer 6, and the first inner sheath layer 7 is wrapped outside the first metal braiding layer 6 surface;

The eight copper wires 3 are twisted in pairs to form four pairs as twisted wire pairs for information communication, the first twisted wire pair 81, the second twisted wire pair 82, and the third twisted wire pair 83 in the four pairs of twisted wire pairs and the fourth twisted pair 84 are arranged counterclockwise and twisted to form the conductive cable core 8, the first twisted pair 81 and the third twisted pair 83 are arranged alternately with the second twisted pair 82 and the fourth twisted pair 84, The outer surfaces of the four pairs of twisted wires are covered with an aluminum foil shielding layer 9, a polyester tape 10 is wrapped around the outer surface of the aluminum foil shielding layer 9, and the second inner sheath layer 11 is wrapped on the polyester tape. belt 10 outer surface;

The outer sheath body 4 includes a first sub-sheath 41, a second sub-sheath 42 and a third sub-sheath 43, the first sub-sheath 41, the second sub-sheath 42 and the third sub-sheath 43 There is a "herringbone"-shaped connection part 12 at the center, and the first connecting rib part 121, the second connecting rib part 122 and the third connecting rib part 123 of the "herringbone"-shaped connecting part 12 are respectively connected to the first Sub-sheath 41, second sub-sheath 42 and third sub-sheath 43, the first sub-sheath 41 covers the outer surface of the steel conductor 1, and the second sub-sheath 42 covers the first inner The outer surface of the sheath layer 7, the third sub-sheath 43 is coated on the outer surface of the second inner sheath layer 11;

A braided copper wire shielding layer 14 is provided between the third sub-sheath 43 and the first inner sheath layer 11, which can ensure the required traction force without increasing the outer diameter, thereby ensuring that the third sub-sheath 43 The adhesion between the first inner sheath layer 11 plays a strengthening role, has a large tensile strength, and can also eliminate or reduce the stress of the cable when it is moving or twisting, and improve the service life of the cable; secondly , to further enhance the anti-jamming performance.

Several metal wires 13 are arranged alternately, one end of the metal wires 13 is wound on the surface of the steel conductor 1, and the other end of the metal wires 13 passes through the first sub-sheath 41, the first rib part 121, and the third rib in turn. part 123 and the third sub-sheath 43 and are electrically connected to the copper wire braided shielding layer 14; the distance between the two adjacent metal wires 13 is 2.4 to 3.7 times the twisted pitch of the conductive cable core 8;

The pitch of the first twisted pair 81 is 15-15.5 mm, the pitch of the second twisted pair 82 is 13.5-13.9 mm, and the pitch of the third twisted pair 83 is 14.2-14.6 mm , the pitch of the fourth twisted wire pair 84 is 12.7-13.1mm;

Adjacent pitch design formula is: 0.002<∣ — ∣≤0.013,

The pitch design formula is: 0.001<∣ — ∣≤0.011;

h1 is the pitch of the first twisted wire pair 81 , h2 is the pitch of the second twisted wire pair 82 or the fourth twisted wire pair 84 , h3 is the pitch of the third twisted wire pair 83 .

The pitch of the first twisted wire pair 81 is 15.2 mm, the pitch of the second twisted wire pair 82 is 13.7 mm, the pitch of the third twisted wire pair 83 is 14.4 mm, and the fourth twisted wire pair 83 has a pitch of 14.4 mm. The pitch of the wire pairs 84 is 12.9mm.

The above four pairs of twisted wires are twisted to form the conductive cable core 8 , and the twisted pitch of the conductive cable core 8 is 9.8 times the pitch of the fourth twisted wire pair 84 .

The above-mentioned aluminum foil shielding layer 9 is composed of a polyester film layer and an aluminum foil layer located on its inner side, the thickness of the polyester film layer is 0.020±0.002 mm, and the thickness of the aluminum foil layer is 0.014±0.002 mm; 1. The adjacent angle between the second connecting rib part and the first connecting rib part is 120°; the steel conductor 1 and the copper wire 3 above are both subjected to an annealing process.

Embodiment 2: A low-loss composite data cable with high shielding performance, comprising: a steel conductor 1, a coaxial conductor 2, eight copper wires 3 coated with a polyethylene layer 31, and an outer sheath 4; The outer surface of the coaxial conductor 2 is covered with a plastic insulating layer 5, the outer surface of the plastic insulating layer 5 is covered with a first metal braiding layer 6, and the first inner sheath layer 7 is wrapped outside the first metal braiding layer 6 Surface; a second metal braiding layer 15 is provided between the first inner sheath layer 7 and the second sub-sheath 42, which is beneficial to further reduce mutual coupling and improve signal transmission quality;

The eight copper wires 3 are twisted in pairs to form four pairs as twisted wire pairs for information communication, the first twisted wire pair 81, the second twisted wire pair 82, and the third twisted wire pair 83 in the four pairs of twisted wire pairs and the fourth twisted pair 84 are arranged counterclockwise and twisted to form the conductive cable core 8, the first twisted pair 81 and the third twisted pair 83 are arranged alternately with the second twisted pair 82 and the fourth twisted pair 84, The outer surfaces of the four pairs of twisted wires are covered with an aluminum foil shielding layer 9, a polyester tape 10 is wrapped around the outer surface of the aluminum foil shielding layer 9, and the second inner sheath layer 11 is wrapped on the polyester tape. belt 10 outer surface;

The outer sheath body 4 includes a first sub-sheath 41, a second sub-sheath 42 and a third sub-sheath 43, the first sub-sheath 41, the second sub-sheath 42 and the third sub-sheath 43 There is a "herringbone"-shaped connection part 12 at the center, and the first connecting rib part 121, the second connecting rib part 122 and the third connecting rib part 123 of the "herringbone"-shaped connecting part 12 are respectively connected to the first Sub-sheath 41, second sub-sheath 42 and third sub-sheath 43, the first sub-sheath 41 covers the outer surface of the steel conductor 1, and the second sub-sheath 42 covers the first inner The outer surface of the sheath layer 7, the third sub-sheath 43 is coated on the outer surface of the second inner sheath layer 11;

A braided copper wire shielding layer 14 is provided between the third sub-sheath 43 and the first inner sheath layer 11, which can ensure the required traction force without increasing the outer diameter, thereby ensuring that the third sub-sheath 43 The adhesion between the first inner sheath layer 11 plays a strengthening role, has a large tensile strength, and can also eliminate or reduce the stress of the cable when it is moving or twisting, and improve the service life of the cable; secondly , to further enhance the anti-jamming performance.

Several metal wires 1 are arranged alternately, one end of the metal wire 13 is wound on the surface of the steel conductor 1, and the other end of the metal wire 13 passes through the first sub-sheath 41, the first rib part 121, and the third rib in turn. part 123 and the third sub-sheath 43 and are electrically connected to the copper wire braided shielding layer 14; the distance between the two adjacent metal wires 13 is 2.4 to 3.7 times the twisted pitch of the conductive cable core 8;

The pitch of the first twisted wire pair 81 is 15.1 mm, the pitch of the second twisted wire pair 82 is 13.5 mm, the pitch of the third twisted wire pair 83 is 14.3 mm, and the fourth twisted wire pair 83 has a pitch of 14.3 mm. The pitch of wire pair 84 is 12.8mm;

Adjacent pitch design formula is: 0.002<∣ — ∣≤0.013,

The pitch design formula is: 0.001<∣ — ∣≤0.011;

h1 is the pitch of the first twisted wire pair 81 , h2 is the pitch of the second twisted wire pair 82 or the fourth twisted wire pair 84 , h3 is the pitch of the third twisted wire pair 83 .

The above four pairs of twisted wires are twisted to form the conductive cable core 8 , and the twisted pitch of the conductive cable core 8 is 7.7 times the pitch of the fourth twisted wire pair 84 .

The foregoing is further elaborated as follows.

Design of Aluminum Foil Material

According to communication cable standards and requirements, the shielding consists of a layer of single-sided composite aluminum foil and a drain wire. The requirements for single-sided composite aluminum foil are detailed in the table below:

Technical requirements for single-sided composite aluminum foil

Design of Braided Copper Wire Material

According to the standards and requirements of communication cables, the braiding material of the armor layer can be a single round copper wire or tinned round copper wire. The length of one-way single-strand disconnection is allowed to be no more than 150mm, and the ends of the disconnected wires should be trimmed neatly.

Main performance indicators of finished cables

Conductor DC resistance (20°C): ≤9 6Ω/km;

Characteristic impedance of twisted pair cable (20°C): 100±15Ω;

Characteristic impedance of coaxial cable (20°C): 75±15Ω;

Cable insulation resistance: ≥10000 MΩ·km.

The above-mentioned embodiments are only to illustrate the technical concept and characteristics of the present invention, and the purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly, and not to limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention shall fall within the protection scope of the present invention.

Claims (4)

1. A kind of 1. low-loss composite data cable of high shielding properties, it is characterised in that：Including：Steel conductor（1）, coaxial conductor （2）, eight pieces be coated with polyethylene layer（31）Copper conductor（3）With oversheath body（4）；The coaxial conductor（2）Outer surface coats There is plastic insulating layer（5）, this plastic insulating layer（5）Outer surface is coated with the first wire sheathing（6）, the first inner restrictive coating（7） It is coated on first wire sheathing（6）Outer surface；

   Eight copper conductors（3）It is twisted two-by-two and forms four pairs of twisted wires pair to be communicated as information, the four twisted pair wires centering the One twisted wire pair（81）, the second twisted wire pair（82）, the 3rd twisted wire pair（83）With the 4th twisted wire pair（84）It is arranged in order and twists counterclockwise Conjunction forms conductive cable core（8）, the first twisted wire pair（81）With the 3rd twisted wire pair（83）With the second twisted wire pair（82）With the 4th twisted wire pair （84）Spaced, four twisted pair wire is coated with foil shielding layer to respective outer surface（9）, a polyester belt（10）Around being wrapped in The foil shielding layer（9）Outer surface, the second inner restrictive coating（11）It is coated on the polyester belt（10）Outer surface；

   The oversheath body（4）Including the first sub- sheath（41）, the second sub- sheath（42）With the 3rd sub- sheath（43）, this first son Sheath（41）, the second sub- sheath（42）With the 3rd sub- sheath（43）There is " people " font connecting portion at center（12）, this " people " Font connecting portion（12）First connect muscle portion（121）, second connect muscle portion（122）Connect muscle portion with the 3rd（123）It is connected respectively to institute State the first sub- sheath（41）, the second sub- sheath（42）With the 3rd sub- sheath（43）, the first sub- sheath（41）The steel is coated on to lead Body（1）Outer surface, the second sub- sheath（42）It is coated on first inner restrictive coating（7）Outer surface, the 3rd sub- sheath（43）Cladding In second inner restrictive coating（11）Outer surface；

   Some plain conductors（13）It is spaced, this plain conductor（13）One ends wound is in the steel conductor（1）Surface, metal Wire（13）The other end sequentially passes through the described first sub- sheath（41）, first connect muscle portion（121）, the 3rd connect muscle portion（123）With Three sub- sheaths（43）And it is electrically connected to proof copper-wire braided screen layer（14）；

   First twisted wire pair（81）Pitch be 15 ~ 15.5mm, second twisted wire pair（82）Pitch for 13.5 ~ 13.9mm, the 3rd twisted wire pair（83）Pitch be 14.2 ~ 14.6mm, the 4th twisted wire pair（84）Pitch for 12.7 ~ 13.1mm；

   Adjacent segments are away from design formula：0.002<∣—∣≤0.013,

   Being separated by pitch design formula is：0.001<∣—∣≤0.011；

   H1 is the first twisted wire pair（81）Pitch, h2 is the second twisted wire pair（82）Or the 4th twisted wire pair（84）Pitch, h3 is 3rd twisted wire pair（83）Pitch；

   Adjacent 2 plain conductors（13）At intervals of conductive cable core（8）2.4 ~ 3.7 times of twisting pitch, described first connects It is 120 ° that muscle portion, second company's muscle portion and first, which connect the adjacent angle of muscle portion,.
2. 2. the low-loss composite data cable of high shielding properties according to claim 1, it is characterised in that：Described four pairs Twisted wire strand forms conductive cable core（8）, this conductive cable core（8）Twisting pitch is the 4th twisted wire pair（84）7.7 ~ 9.8 times.
3. 3. according to the low-loss composite data cable of the high shielding properties described in claim 1, it is characterised in that：It is described Foil shielding layer（9）It is made up of the aluminium foil layer of laminated polyester film and face on its inside, the laminated polyester film thickness is 0.020 ± 0.002mm, the aluminium foil layer thickness are 0.014 ± 0.002 mm.
4. 4. according to the low-loss composite data cable of the high shielding properties described in claim 1, it is characterised in that：The steel Conductor（1）And copper conductor（3）Handled by annealing process.