CN106328299A - Insulated and low-loss data cable for high-speed train communication - Google Patents
Insulated and low-loss data cable for high-speed train communication Download PDFInfo
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- CN106328299A CN106328299A CN201510356141.1A CN201510356141A CN106328299A CN 106328299 A CN106328299 A CN 106328299A CN 201510356141 A CN201510356141 A CN 201510356141A CN 106328299 A CN106328299 A CN 106328299A
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Abstract
The invention discloses an insulated and low-loss data cable for high-speed train communication. The insulated and low-loss data cable comprises a cable core, signal cable pairs, an outer sheath, and a shielding body structure which consists of sub shielding layers and a general shielding layer in a combined manner, wherein the cable core comprises multiple signal cable pairs; each signal cable pair comprises two or more than two data cable wire cores; each data cable wire core comprises an inner conductor, an inner skin layer, a foaming layer and an outer skin layer from inside to outside in sequence in a three-layer co-extrusion manner; a first grounding line, a sub shielding layer, a protection layer, an aluminum foil shielding layer, a second grounding line and a weaving shielding layer are arranged between each signal cable pair and the outer sheath in sequence; the shielding structure system which consists of the sub shielding layers and the general shielding layer in a combined manner is adopted; namely, each signal cable pair is twisted based on a certain pitch; then the first grounding line is added, and the aluminium foil is longitudinally wrapped independently; next, a general-covering structural way of a metal weaving net and the aluminum foil shielding layer, and the second grounding line is formed; and the insulated and low-loss data cable is high in external electromagnetic wave interference resistance, high in electromagnetic compatibility, and reliable in transmission performance.
Description
Technical field
The present invention relates to a kind of communication cable, especially relate to a kind of use communication data cable on bullet train.
Background technology
Recently as the fast development of Chinese Railway, china railway revenue kilometres reach 120,000 kilometers, at the forefront in the world, and current national economy entirety faces descending pressure, strengthen Railway Investment dynamics to pulling growth of the national economic to have sizable positive role.Along with high-speed railway is more fully built in future time, the data cable consumption being connected to high ferro equipment transmission signal is bigger.Continuous renewal however as high ferro equipment technology, requirement to signal cable is more and more higher, traditional bullet train data cable is being used above aluminium foil and mesh grid two-layer stratigraphic structure to shielding construction design, this structure is unfavorable for that cable is connected process with equipment, its shielding attenuation numerical value is little, it is unfavorable for more preferably guaranteeing data cable anti-external electromagnetic waves interference, has had a strong impact on High Speed Train Communication Network network safety.The most traditional train data cable uses low-smoke non-halogen flame-retardant oversheath or uses conventional low medium physically foamed pe insulation sheath, owing to although the jacket material of low-smoke non-halogen flame-retardant oversheath possesses certain flame retardant efficiency, but its against weather is the best, normal use temperature degree scope is-30 DEG C～105 DEG C；And when running under bullet train is in temperature conditions of extremely trembling with fear (-55 DEG C), data cable structure then easily affects data transmission performance because of destroyed.The most northeastward and time the extremely cold area such as Russian Far East runs, its, minimum temperature generally up to-55 DEG C, used regular cable easily to cause sheath ftracture in winter, and low temperature the most easily produces destruction to inside cable core, finally affect bullet train signal transmission performance, affect high speed train safety.And when using conventional low medium physically foamed pe insulation sheath data cable to meet high-temperature component, cable can produce bigger signal transmission attenuation phenomenon；Reaching 350km/h when bullet train speed per hour, when being short-circuited such as internal data cable, Typical physical polyethylene foamed insulation data cable can produce combustion phenomena, the most largely endangers high ferro traffic safety simultaneously.That goes up largely have impact on High Speed Train Communication Network network safety.
Summary of the invention
The present invention solves that existing bullet train communication data cable also exists at each signal cable line mutually producing interference, and the present situation such as anti-external electromagnetic waves interference difference and in the one beneficially train control system that provides each holding wire interfere phenomenon to producing, anti-external electromagnetic waves interference is good, possess more high electrical-magnetic compatibility, make the bullet train communication insulation low-loss data cable that train control system capacity of resisting disturbance promotes further.
The present invention solves that the concrete technical scheme that above-mentioned technical problem is used is: a kind of bullet train communication insulation low-loss data cable, including cable conductor, signal cable line to and oversheath, it is characterized in that: also include the shield structure that sub-shield and total screen layer combine, described cable conductor includes some groups of signal cable lines pair, the often group signal cable line data cable core to including two or more than two, every data lines cable core from inside to outside be followed successively by interior core, endodermis, foaming layer and exodermis, described endodermis, foaming layer and exodermis use three-layer co-extruded formula structure；The first earth lead, sub-shield, protective layer and foil shielding layer, the second earth lead and woven shield it is sequentially provided with between described signal cable line pair and described oversheath；Often group signal cable line centering all uses the independent grounding structure being provided with the first earth lead; often group signal cable line to and the first earth lead is jointly outer is surrounded by sub-shield and protective layer; described sub-shield uses aluminium foil around being wrapped on the first earth lead outer surface; or on the outer surface being wrapped in often group cable pair and the first earth lead; sub-shield conducting surface inwardly contacts with the first earth lead, constitutes separated-shielding structure；It is provided with foil shielding layer between described protective layer and the second earth lead, between the second earth lead and oversheath, is provided with woven shield, what foil shielding layer, the second earth lead and woven shield collectively formed the communications cable always shield sheet building.In being conducive to train control system, each signal cable line interferes phenomenon to producing, and possesses more preferable shield effectiveness, improves anti-external electromagnetic waves interference, possess more high electrical-magnetic compatibility, makes train control system possess more high anti-jamming capacity；Guarantee that signal transmission performance is more reliable.
Further, described endodermis, foaming layer and exodermis all use polyfluorinated ethylene material.Possess good mechanism's physical property, anti-flammability, water preventing ability, the feature such as against weather and corrosion resistance.Preferably solving to avoid sheath cracking when extremely cold area is run, low temperature the most easily produces destruction to internal cable core；Or bigger signal transmission attenuation phenomenon it is easily generated when high temperature, improve signal transporting；Running in extremely cold area and be less susceptible to cracking, product life-time service is when temperature range is-90 DEG C to 200 DEG C, and its related physical structures characteristic energy, electric property, transmission performance does not changes.Bullet train communication of the present invention insulation low-loss data cable uses tin-coated copper core; physical blowing perfluoroethylene-propylene insulate as signal transmission medium body; its dielectric constant is 1.6; high frequency signal transmission decay is little; extrude a strata perfluoroethylene-propylene (copolymer) protective layer on perfluoroethylene-propylene foaming layer surface simultaneously; prevent moisture invasion foaming edge edge layer, it is ensured that signal transmission performance is more reliable.
Further, described every data lines cable core endodermis uses polyfluorinated ethylene to extrude on the wicking surface of interior lines, foaming layer uses polyfluorinated ethylene material nitrogen charging physics bag bubble to squeeze on endothelial surface, exodermis uses polyfluorinated ethylene to mix with different colours perfluoroethylene-propylene bed material color masterbatch and extrudes on foaming layer surface, form different colours line to structure.Possess good mechanism's physical property, anti-flammability, water preventing ability, the feature such as against weather and corrosion resistance.Product life-time service is when temperature range is-90 DEG C to 200 DEG C, and its related physical structures characteristic energy, electric property, transmission performance does not changes.
Further, described every data lines cable core is extruded with a strata perfluoroethylene-propylene (copolymer) endodermis at interior lines wicking surface, it is extruded with a strata perfluoroethylene-propylene (copolymer) physical blowing layer at endothelial surface, foaming layer surface is extruded with a strata perfluoroethylene-propylene (copolymer) exodermis, and wherein exodermis has thicker skin thickness than endodermis.Possess good mechanism's physical property, anti-flammability, water preventing ability, the feature such as against weather and corrosion resistance.Product life-time service is when temperature range is-90 DEG C to 200 DEG C, and its related physical structures characteristic energy, electric property, transmission performance does not changes.
Further, described oversheath uses perfluoroethylene bright alkene material.Meeting the related physical performance of the general data cable of bullet train, electric property, while transmission performance, by using perfluoroethylene-propylene sheath material, reach more preferably to meet the effect of high temperature flame-proof.Possess good mechanism's physical property, anti-flammability, water preventing ability, the feature such as against weather and corrosion resistance.Product life-time service is when temperature range is-90 DEG C to 200 DEG C, and its related physical structures characteristic energy, electric property, transmission performance does not changes.
Further, the second described earth lead is helically wound and is formed on foil shielding layer surface, and described woven shield is coated on the second earth lead surface.Improve the Electro Magnetic Compatibility of total shielding layer structure.
Further, described woven shield uses the tin plating mesh grid of more than 90%.Improve the Electro Magnetic Compatibility of woven shield.
Further, described protective layer is wound on sub-shield surface in spiral winding mode.Play preferably insulation and hard-pressed bale effect.
Further, described foil shielding layer is to add earth lead 360 degree around being wrapped in cable conductor surface with blue face aluminium foil, and its conducting surface outwards contacts with the second earth lead.
Further, described foil shielding layer is coated on cable conductor surface with vertical packet form.Improve shield effectiveness and Electro Magnetic Compatibility.
The invention has the beneficial effects as follows: in being conducive to train control system, each signal cable line interferes phenomenon to producing, possesses more preferable shield effectiveness, improve anti-external electromagnetic waves interference, possess more high electrical-magnetic compatibility, make train control system possess more high anti-jamming capacity；Guarantee that signal transmission performance is more reliable.Preferably solving to avoid sheath cracking when extremely cold area is run, low temperature the most easily produces destruction to internal cable core；Or bigger signal transmission attenuation phenomenon it is easily generated when high temperature, improve signal transporting；Running in extremely cold area and be less susceptible to cracking, signal transmission performance is more reliable.There is more preferable incombustibility, low cost.
Accompanying drawing explanation:
The present invention is described in further detail with detailed description of the invention below in conjunction with the accompanying drawings.
Fig. 1 is the structural representation of bullet train communication of the present invention insulation low-loss data cable.
The correspondence respectively of labelling shown in accompanying drawing is represented as: 1. core in；2. endodermis；3. foaming layer；4. exodermis；5. the first earth lead；6. sub-shield；7. protective layer；8. foil shielding layer；9. the second earth lead；10. woven shield；11. oversheaths.
Detailed description of the invention
In embodiment shown in Fig. 1, a kind of bullet train communication insulation low-loss data cable, including cable conductor, signal cable line to and oversheath, also include the shield structure that sub-shield and total screen layer combine, namely each signal cable line is to individually carrying out vertical aluminium foil after adding the first earth lead by certain pitch twisting, carry out metal net screen layer and foil shielding layer again, the shield version that the second earth lead always covers.In such shield structure is more beneficial for train control system, each holding wire interferes phenomenon to producing, and is provided simultaneously with good Electro Magnetic Compatibility, makes train control system capacity of resisting disturbance promote further.Described cable conductor includes some groups of signal cable lines pair, the often group signal cable line data cable core to including two or more than two, every data lines cable core from inside to outside be followed successively by interior core 1, endodermis 2, foaming layer 3 and exodermis 4, described endodermis, foaming layer and exodermis use three-layer co-extruded formula structure；Complete insulated wire cores by high-pressure physics nitrogen charging synchronizer to extrude.While i.e. extruding a strata perfluoroethylene-propylene (copolymer) endodermis on interior core, complete perfluoroethylene-propylene foaming layer, and synchronize to extrude a strata perfluoroethylene-propylene (copolymer) exodermis on foaming layer surface, reach more effectively to prevent the effect of moisture invasion foaming layer, more can ensure that signal transmission performance is more reliable.The first earth lead 5, sub-shield 6, protective layer 7 and foil shielding layer the 8, second earth lead 9 and woven shield 10 it is sequentially provided with between described signal cable line pair and described oversheath 11；Often group signal cable line centering all uses the independent grounding structure being provided with the first earth lead 5; often group signal cable line to and the first earth lead 5 is common outer is surrounded by sub-shield 6 and protective layer 7; described sub-shield 6 uses aluminium foil around being wrapped in the first earth lead 5 and often organizing on cable pair surface, constitutes separated-shielding structure；Namely each signal cable line is to carrying out the sub-shield that wrapped aluminium foil is made after adding the first earth lead, insulate further around bag polyester belt protective layer；Such as using two in embodiment of the present invention figure two data lines cable cores and the first earth lead, sub-shield, protective layer are carried out strand system by a constant pitch and formed, the sub-shield conducting surface that aluminium foil is made inwardly contacts with the first earth lead.It is provided with foil shielding layer 8 between described protective layer 7 and the second earth lead 9, between the second earth lead 9 and oversheath 11, is provided with woven shield 10, what foil shielding layer the 8, second earth lead 9 and woven shield 10 collectively formed the communications cable always shield sheet building.The present invention uses aluminium foil sub-shield conduction inner face and the first earth lead contact form, i.e. first earth lead is together with in aluminium foil, conducting surface contacts, this frame mode is more beneficial for cable and is connected process with terminal unit, by testing it at 3MHz near-end crosstalk attenuation test value >=45dB.And traditional bullet train data cable always shields with aluminium foil single layer structure form, its shielding attenuation numerical value of this structured testing is little, then be unfavorable for data cable anti-external electromagnetic waves interference.The present invention uses woven shield and foil shielding layer, total shielding construction of the second earth lead, and its shielding attenuation test value when 3MHz reaches 90 more than dB, possesses good Electro Magnetic Compatibility.Endodermis 2, foaming layer 3 and exodermis 4 all use polyfluorinated ethylene material.Physical blowing fluoroplastic insulation low-loss data cable uses tin-coated copper core; physical blowing perfluoroethylene-propylene insulate as signal transmission medium body; its dielectric constant is 1.6; high frequency signal transmission decay is little; extrude a strata perfluoroethylene-propylene (copolymer) protective layer on perfluoroethylene-propylene foaming layer surface simultaneously; prevent moisture invasion foaming edge edge layer, it is ensured that signal transmission performance is more reliable.First earth lead 5 and the second earth lead 9 are to be formed by multiply tin-coated copper skein silk system, be wound in often group signal cable line on surface, this form be more beneficial for preventing each signal cable line between interfere.Possess good mechanism's physical property, anti-flammability, water preventing ability, the feature such as against weather and corrosion resistance.Product life-time service is when temperature range is-90 DEG C to 200 DEG C, and its related physical structures characteristic energy, electric property, transmission performance does not changes.Easily cause sheath cracking when-55 DEG C of extremely cold area are run, and low temperature the most easily produces destruction to internal cable core；Or bigger signal transmission attenuation phenomenon it is easily generated when high temperature；Signal transmission attenuation is low, runs the most easy to crack in extremely cold area.And traditional data cable sheath material uses LSOH anti-flaming polyene material, its life-time service temperature range is-30 DEG C to 105 DEG C, and core transmission attenuation is influenced by ambient temperature big especially, experiment proves that, when cable peripheral temperature rises 1 DEG C, its transmission attenuation value improves 0.1%.And traditional data cable core uses physically foamed pe insulation; this material is combustibles, and oversheath uses halogen-free and low-smoke flame-retardant polyolefin material, and this material oxygen index (OI) is 45; although possessing preferable anti-flammability, but this structure cable can not reach the most fire-retardant safeguard protection effect.Oversheath 11 uses perfluoroethylene bright alkene material.In the related physical performance meeting the general data cable of bullet train, electric property, while transmission performance, by using perfluoroethylene-propylene sheath material, reach a high temperature fire-retardant effect, this material oxygen index (OI) reaches more than 95, possesses the most not flammability, and cable overall flame performance meets Underwriters Laboratories CMP level flame-retardancy requirements.Oversheath possesses good insulating properties, and under room temperature, dielectric strength reaches >=30KV, specific insulation >=5X10 when 200 DEG C16Ω .m, is provided simultaneously with the anti-flammability of excellence, possesses higher Transmission performance.Physical blowing perfluoroethylene-propylene insulating barrier is used on data cable core structure, reduce core average dielectric constant, meet signal and transmit low attenuation requirement, improve core transfer rate, under the conditions of reaching same transmission performance, reduce core outside dimension, save insulant in a large number, thus reduce production cost.Traditional bullet train data cable uses physically foamed pe insulation, and its foam degrees is about 50%, and transfer rate is 81%, and saving material is 66%；Bullet train communication of the present invention insulation low-loss data cable uses perfluoroethylene-propylene physical foam insulation, its foaming reaches more than 70%, transfer rate is about 88%, saving material is 81%, its maximum attenuation value is tested less than 20dB/km, 2MHz mutual capacitance≤4.6pF/m, dielectric strength AC when frequency 3MHz, 15KV, 5min do not puncture.Insulation resistance >=5000M Ω .km, surface of insulating layer extrudes a strata perfluoroethylene-propylene (copolymer) exodermis simultaneously so that it is line is more stable to structure, and characteristic impedance meets 120 ± 10 Ω at 3MHz.Every data lines cable core endodermis 2 uses polyfluorinated ethylene to extrude on interior core 1 surface, foaming layer 3 uses polyfluorinated ethylene material nitrogen charging physics bag bubble to squeeze on endodermis 2 surface, its foam degrees reaches more than 70%, and this insulant dielectric constant is little and stable, possesses resistant of high or low temperature requirement；Exodermis 4 uses polyfluorinated ethylene to mix with different colours perfluoroethylene-propylene bed material color masterbatch and extrudes on foaming layer 3 surface, form different colours line to structure.Little and stable meeting insulant dielectric constant, on the basis of possessing resistant of high or low temperature requirement, improve the communication data identity of every data lines cable core, be more conducive to improve the installation of communication equipment and attended operation efficiency and security reliability.Every data lines cable core is extruded with a strata perfluoroethylene-propylene (copolymer) endodermis 2 on interior core 1 surface, a strata perfluoroethylene-propylene (copolymer) physical blowing layer 3 it is extruded with on endodermis 2 surface, foaming layer 3 surface is extruded with a strata perfluoroethylene-propylene (copolymer) exodermis 4, and wherein exodermis has thicker skin thickness than endodermis.Second earth lead 9 is helically wound and is formed on foil shielding layer 8 surface, and described woven shield 8 is coated on the second earth lead 9 surface.Woven shield 8 uses the tin plating mesh grid of more than 90%.Protective layer 7 is wound on sub-shield surface in spiral winding mode.Play preferably insulation and hard-pressed bale effect.Sub-shield 6 is by the aluminium foil that thickness is 50um around being wrapped on the first earth lead 5 surface, and its conducting surface inwardly contacts with the first earth lead 5, advantageously reduce line between signal interfere, be also more convenient for being welded in above terminal unit.Can certainly be that now the first earth lead 5 is parallel distributed architecture with often group cable pair around being wrapped in the first earth lead 5 and often organizing on cable pair by sub-shield 6.Foil shielding layer 8 is to add earth lead 360 degree around being wrapped in cable conductor surface with blue face aluminium foil, and its conducting surface outwards contacts with the second earth lead 9.Woven shield 10 is carried out by the second earth lead 9 and is placed on foil shielding layer 8 surface, and woven shield uses tin-coated copper material, and count reaches more than 90%, and this structure beneficially data cable possesses good Electro Magnetic Compatibility.Described sheath extrudes outside woven shield.
Foil shielding layer 8 is coated on cable conductor surface with vertical packet form.
Above content and structure describes the ultimate principle of product of the present invention, principal character and advantages of the present invention, skilled person will appreciate that of the industry.The principle that the present invention is simply described described in examples detailed above and description, without departing from the spirit and scope of the present invention, the present invention also has various changes and modifications, within these changes and improvements broadly fall into scope of the claimed invention.Claimed scope is defined by appending claims and equivalent thereof.
Claims (10)
1. a bullet train communication insulation low-loss data cable, including cable conductor, signal cable line to and oversheath, it is characterized in that: also include the shield structure that sub-shield and total screen layer combine, described cable conductor includes some groups of signal cable lines pair, the often group signal cable line data cable core to including two or more than two, every data lines cable core from inside to outside be followed successively by interior core, endodermis, foaming layer and exodermis, described endodermis, foaming layer and exodermis use three-layer co-extruded formula structure；The first earth lead, sub-shield, protective layer and foil shielding layer, the second earth lead and woven shield it is sequentially provided with between described signal cable line pair and described oversheath；Often group signal cable line centering all uses the independent grounding structure being provided with the first earth lead; often group signal cable line to and the first earth lead is jointly outer is surrounded by sub-shield and protective layer; described sub-shield uses aluminium foil around being wrapped on the first earth lead outer surface; or on the outer surface being wrapped in often group cable pair and the first earth lead; sub-shield conducting surface inwardly contacts with the first earth lead, constitutes separated-shielding structure；It is provided with foil shielding layer between described protective layer and the second earth lead, between the second earth lead and oversheath, is provided with woven shield, what foil shielding layer, the second earth lead and woven shield collectively formed the communications cable always shield sheet building.
2. according to the insulation low-loss data cable of the bullet train communication described in claim 1, it is characterised in that: described endodermis, foaming layer and exodermis all use polyfluorinated ethylene material.
3. according to the insulation low-loss data cable of the bullet train communication described in claim 1, it is characterized in that: described every data lines cable core endodermis uses polyfluorinated ethylene to extrude on the wicking surface of interior lines, foaming layer uses polyfluorinated ethylene material nitrogen charging physics bag bubble to squeeze on endothelial surface, exodermis uses polyfluorinated ethylene to mix with different colours perfluoroethylene-propylene bed material color masterbatch and extrudes on foaming layer surface, form different colours line to structure.
4. according to the insulation low-loss data cable of the bullet train communication described in claim 1, it is characterized in that: described every data lines cable core is extruded with a strata perfluoroethylene-propylene (copolymer) endodermis at interior lines wicking surface, it is extruded with a strata perfluoroethylene-propylene (copolymer) physical blowing layer at endothelial surface, foaming layer surface is extruded with a strata perfluoroethylene-propylene (copolymer) exodermis, and wherein exodermis has thicker skin thickness than endodermis.
5. according to the insulation low-loss data cable of the bullet train communication described in claim 1, it is characterised in that: described oversheath uses perfluoroethylene bright alkene material.
6. according to the insulation low-loss data cable of the bullet train communication described in claim 1, it is characterised in that: the second described earth lead is helically wound and is formed on foil shielding layer surface, and described woven shield is coated on the second earth lead surface.
7. according to the insulation low-loss data cable of the bullet train communication described in claim 1 or 6, it is characterised in that: described woven shield uses the tin plating mesh grid of more than 90%.
8. according to the insulation low-loss data cable of the bullet train communication described in claim 1, it is characterised in that: described protective layer is wound on sub-shield surface in spiral winding mode, and its conducting surface outwards contacts with the second earth lead.
9. according to the insulation low-loss data cable of the bullet train communication described in claim 1 or 6, it is characterised in that: described foil shielding layer is to add earth lead 360 degree around being wrapped in cable conductor surface with blue face aluminium foil.
10. according to the insulation low-loss data cable of the bullet train communication described in claim 1 or 6, it is characterised in that: described foil shielding layer is coated on cable conductor surface with vertical packet form.
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| CN201510356141.1A CN106328299A (en) | 2015-06-25 | 2015-06-25 | Insulated and low-loss data cable for high-speed train communication |
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| CN201510356141.1A CN106328299A (en) | 2015-06-25 | 2015-06-25 | Insulated and low-loss data cable for high-speed train communication |
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| CN114530739A (en) * | 2022-01-20 | 2022-05-24 | 北京全路通信信号研究设计院集团有限公司 | Anti-electromagnetic interference cable and connecting method thereof, transponder system and train |
| CN114999742A (en) * | 2022-05-30 | 2022-09-02 | 浙江天杰实业股份有限公司 | Production method of fireproof data communication cable |
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Application publication date: 20170111 |