CN100349233C - Fire isolation layer fire-proof digital signal cable - Google Patents
Fire isolation layer fire-proof digital signal cable Download PDFInfo
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- CN100349233C CN100349233C CNB2005100405598A CN200510040559A CN100349233C CN 100349233 C CN100349233 C CN 100349233C CN B2005100405598 A CNB2005100405598 A CN B2005100405598A CN 200510040559 A CN200510040559 A CN 200510040559A CN 100349233 C CN100349233 C CN 100349233C
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Abstract
The present invention relates to a novel fire-proof digital signal cable with a fire isolating layer, which belongs to the technical field of cable techniques. An insulating layer made of a polyethylene foamed material is extruded and coated on an oxygen-free circular copper wire conductor by adopting a cover-foam-cover three-layer common extruding method, and four insulating wire cores are intertwisted into a stranded winding which is bundled with yarn to form a winding. A plurality of windings are intertwisted into a cable core which is extruded and coated with an internal fire isolating layer made of an aluminum hydroxide sizing material, and a fire-proof layer made of a mica tape is coated by winding on the internal fire isolating layer. An external fire isolating layer made of the aluminum hydroxide sizing material is extruded and coated on the fire-proof layer made of a mica tape, and an inflaming retarding coating band, an extruding bittern-free low-smoke inflaming retarding polyolefin internal protective sleeve, a lapping aluminum-plastic composite band shielding layer, an extruding bittern-free low-smoke inflaming retarding polyolefin external protective sleeve are coated by winding on the external fire isolating layer in sequence. The present invention has the advantages of novel and reasonable structure, scientific material adoption, strong electromagnetic interference resistance, high use frequency, low transmission attenuation, low capacity low capacitance and accurate and stable signal transmission, and is suitable for system devices in places of light rails, subways, etc.
Description
Technical field
The present invention relates to the signal cable of a kind of structure of cable, particularly fire safe type, belong to the cable technology field.
Background technology
Along with the arrival of information age, greatly developing information technology and extensive use electronic computer has been the modern important symbol of track traffic.As rail communication is that the track circuit technology of main body has been upgraded notion and enlarged its range of application of development, in rail traffic signal system, adopt computer control, detection technique, to realize multitask, many information real-time automatic collecting and processing, guaranteeing under the safe prerequisite, improve automatization level and transportation dispatching commander efficient, to satisfy the requirement that track traffic at a high speed, efficiently reaches safe operation better.
Current, urban track traffic is generally risen in China, but because its environment particularity, and this just requires to build units such as merchant, operator, design and installation and pays attention to and consider its fail safe.Because track traffic has characteristics such as personnel concentrate, the volume of the flow of passengers is big, channel outlet is restricted, in case have an accident, consequence is hardly imaginable.Show according to the interrelated data statistics, in the accident that subway takes place, the most serious in recent years with fire.In case the subway breaking out of fire, power communication system is interrupted at once, and illumination, communication are all interrupted, and this not only will make the people in the fire be difficult to flee from dangerous situation, also implements rescue to the fire fighter and makes troubles.Ground is underground can't be linked up, and allows causality loss increase virtually.
Traditional fire resistance signal cable is made of conductor, insulating barrier, flame retardant coating, screen and oversheath etc., and wrapped mica brings the realization fire resistance on the flame retardant coating employing insulated wire cores, this structural requirement thickness of insulating layer thickening, high material consumption.In addition, cable is in burning, and flame retardant coating is intact, but insulating barrier (PE material) all burnouts, and the structure of cable can change, thereby has changed the right fixedly pitch size of line, the dielectric constant of cable makes cable can not guarantee the signal transmission accurately in burning also along with change.
Summary of the invention
It is good to the purpose of this invention is to provide a kind of fire resistance, and the signal transmission is stable fire isolation layer fire-proof digital signal cable accurately.
The object of the present invention is achieved like this, fire isolation layer fire-proof digital signal cable, comprise conductor, insulating barrier, comprehensive flame retardant coating, screen and oversheath, it is characterized in that described conductor is the anaerobic round copper wire, described insulating barrier is a polythene material, on the anaerobic round copper wire, adopt the three-layer co-extruded physical foam insulation technology of skin-bubble-Pi to extrude polyethylene foamed insulated with material layer and constitute single insulated wire cores, thoroughly do away with the edge core with four and be twisted into the twisted wire group, on the twisted wire group, prick yarn and become the line group with polyester, some line groups are twisted into cable core, in some line groups of twisted cable core, 50% line group be provided with internal shield and in, outer polyester band (CV band) covering, in internal shield is arranged on, the centre of outer polyester band (CV band) covering, adopt plsitive mold on cable core, to extrude refuge floor in the aluminium hydroxide sizing material work, wrapped mica tape flame retardant coating on interior refuge floor, adopt plsitive mold on the mica tape flame retardant coating, to extrude refuge floor outside the aluminium hydroxide sizing material, wrapped fire-retardant band on the refuge floor outside, extrude the halogen-free and low-smoke flame-retardant polyolefin inner sheath on the fire-retardant band, wrapped aluminium-plastic tape screen extrudes the halogen-free and low-smoke flame-retardant polyolefin oversheath on the inner sheath on the composite band screen.
Polyester band on the described line group (CV band) covering, interior polyester band (CV band) covering is vertical covering, outer polyester band covering is a lapping layer.Four of described line group is thoroughly done away with the dividend of edge core, green, white, Lan Si kind color, position quadrate.Described being twisted on the cable core with band carries out extruding refuge floor in the aluminium hydroxide sizing material again after fine pith ties up on cable core.Mica tape flame retardant coating wrapped on the interior refuge floor is double-deck mica tape, and the rate of putting up reaches 50%.
The conductor of fire isolation layer fire-proof digital signal cable adopts the anaerobic round copper wire, guarantees that the transmission performance of cable is stable; Adopt the insulation of polyethylene foamed Insulation Material, utilize the three-layer co-extruded physical foam insulation technology of skin-bubble-Pi, make insulated wire cores have high foaming rate, and mechanical strength is higher, make cable have low electric capacity, low decay, insulated wire cores dividend simultaneously, green, white, Lan Si kind color are convenient to identifying operation; The line group adopts the quad structure, makes four single line position quadrates, thereby guarantees the electric property of line group, satisfies the different transmission performance requirements of cable; Internal shield adopts the copper strips shielding construction, to satisfy the requirement that cable transmits same signal simultaneously; The line group is twisted into cable core, and adopts suitable twisting pitch, with band cable core is carried out fine pith and tie up,, help improving the cross-talk index and the interference free performance of cable to stablize the structure of each line group of cable core; Adopt double-deck fire-resistant sizing material refuge floor, play dual fire insulation effect, decompose when this sizing material is heated, discharge the crystallization water and heat absorption, and form a cover layer at the cable core laminar surface, effect heat insulation, oxygen barrier that cover layer can play, the primary insulation organic substance is protected, and interior refuge floor adopts plsitive mold to extrude, and is beneficial to fill all clearance spaces, outer refuge floor adopts tubular molding tool to extrude, and surface thickness is even; Flame retardant coating adopts wrapped double-deck mica tape, and the rate of putting up is 50%, and whole cable is played fire-resistant effect; Screen adopts the aluminium-plastic tape shielding both to play total shielding action and has also played good heat insulation, oxygen barrier effect, this screen is except stoping heat to internal delivery, also delay the impact of external flame burning and the internal portion of air-flow, strengthened the fire resistance of cable; Inside and outside sheath all adopts halogen-free and low-smoke flame-retardant polyolefin to extrude, rate of fire travel when this material can slow down cable fire, the operating time of prolongation fire-resisting cable.
Novel and reasonable structure of the present invention, the selection of material science.Product satisfies the requirement and relevant index of track traffic with the fire safe type digital signal cable:
One, fire-resistant combustibility meets the regulation of GB/T19216.11 and GB/T19216.23, and promptly cable guarantees that not only digital data transmission is accurate when flame temperature is not less than 750 ℃ of burnings, also will guarantee its energising ability of 90 minutes simultaneously;
Two, conductor DC resistance: 22.5 ± 1.0 Ω/km 20 ℃ the time;
Three, insulation resistance (100-500V) 〉=10000M Ω km;
Four, two lines are to D.C. resistance imbalance≤1.0%;
Five, cable capacitance: (non-shield type) quad 28 ± 3nF/km, (shield type) quad 28 ± 2nF/km, single insulated wire cores is to being connected to electric capacity≤70nF/km between other insulated wire cores of ground;
Six, capacitive coupling coefficient k1: mean value≤81pF/1000m; Maximum≤330pF/1000m;
Seven, near-end crosstalk attenuation: 150kHz :≤61dB/km; 1000kHz :≤40dB/km;
Eight, far-end crosstalk attentuation: 150kHz :≤68dB/km; 1000kHz :≤40dB/km;
Nine, shielding factor (50Hz): composite sheath≤0.8, aluminium sheath≤0.2.
The advantage that fire isolation layer fire-proof digital signal cable has:
The voltage loads height; Can satisfy the requirement of transmitting audio signal and digital signal simultaneously; Have characteristics such as anti-strong electromagnetic, frequency of utilization height, low, the low electric capacity of transmission attenuation, stable signal transmission; Cross-talk is little between quad shielded cable group; Cable can be not less than the signal transmission capabilities that kept under 750 ℃ of high-temp combustion conditions 90 minutes in flame temperature, and accurate.Economic environmental protection, from product to using the overall process environmentally safe.
Test shows that fire isolation layer fire-proof digital signal cable is behind 815 ℃ of flame jet 90min, and the polyethylene layer of its cable is intact substantially, guaranteed that cable becomes cable core structure no change, thereby the electric property that has guaranteed cable is reliable.The successful realization of this structure has solved there is distorted signals in other fire resistance signal cable structure when flame combustion a difficult problem.This cable is applicable to the connection between the relevant devices and control device in the rail traffic signal system, can realize that 1MHz (analog signal), 2Mbit/s (digital signal) and rated voltage exchange the transmission of 750V or direct current 1100V and following system control information and electric energy, and in breaking out of fire, can keep the normal signal transmission of 90min.Be specially adapted to inside fire safety system equipment such as light rail, subway and the place safety system equipment of the crowd is dense sealing.
Description of drawings
Fig. 1 is a structural representation of the present utility model;
Among the figure: 1 conductor, 2 insulating barriers, 3 are pricked refuge floor, 8 flame retardant coatings, 9 outer refuge floors, 10 fire-retardant bands, 11 inner sheaths, 12 screens, 13 oversheaths in yarn, the vertical covering of 4CV band, 5 internal shields, the 6CV band lapping layer, 7.
Embodiment
On anaerobic round copper wire conductor 1, adopt the three-layer co-extruded physical foam insulation technology of skin-bubble-Pi to extrude polyethylene foamed insulated with material layer 2 and constitute single insulated wire cores, thoroughly do away with the edge core with every group four and be twisted into the twisted wire group, four of twisted wire group is thoroughly done away with the dividend of edge core, green, white, Lan Si kind color, position quadrate.Wrapped polyester is pricked yarn and is pricked the yarn group for 3 one-tenth on the twisted wire group.After wrapped polyester is pricked yarn 3 on the twisted wire group, the vertical covering (the polyester band is indulged covering) 4 of CV band is set thereon again, wrapped copper strips internal shield 5 on the vertical covering 4 of CV band, wrapped CV band lapping layer (polyester band lapping layer) 6 constitutes inner shield line group on internal shield 5.Pricking yarn groups and two groups of inner shield line groups with two groups intersects to be symmetrical arranged and is twisted into cable core and (adopts how many quad twisted cable core, be needs according to design, should meet TB/T3100 railway digital signal cable standard-required, can be 8,12,14,16,19,21,24,28,30,33,37,42,44,48 cores), on cable core, carry out fine pith and tie up with band.Adopt plsitive mold on cable core, to extrude refuge floor 7 in the aluminium hydroxide sizing material, wrapped double-deck mica tape flame retardant coating 8 on interior refuge floor 7, the rate of putting up reaches 50%.Adopt plsitive mold on mica tape flame retardant coating 8, to extrude refuge floor 9 outside the aluminium hydroxide sizing material, wrapped fire-retardant band 10 on the refuge floor outside, extrude halogen-free and low-smoke flame-retardant polyolefin inner sheath 11 on the fire-retardant band, wrapped aluminium-plastic tape screen 12 extrudes halogen-free and low-smoke flame-retardant polyolefin oversheath 13 on the inner sheath on the composite band screen.
Claims (5)
1, a kind of fire isolation layer fire-proof digital signal cable, comprise conductor, insulating barrier, flame retardant coating, screen and oversheath, it is characterized in that described conductor is the anaerobic round copper wire, described insulating barrier is a polythene material, on the anaerobic round copper wire, adopt the three-layer co-extruded physical foam insulation technology of skin-bubble-Pi to extrude polyethylene foamed insulated with material layer and constitute single insulated wire cores, thoroughly do away with the edge core with four and be twisted into the twisted wire group, on the twisted wire group, prick yarn and become the line group with polyester, some line groups are twisted into cable core, in some line groups of twisted cable core, 50% line group be provided with internal shield and in, outer polyester band covering, in internal shield is arranged on, the centre of outer polyester band covering, adopt plsitive mold on cable core, to extrude refuge floor in the aluminium hydroxide sizing material work, wrapped mica tape flame retardant coating on interior refuge floor, adopt plsitive mold on the mica tape flame retardant coating, to extrude refuge floor outside the aluminium hydroxide sizing material work, wrapped fire-retardant band on the refuge floor outside, extrude the halogen-free and low-smoke flame-retardant polyolefin inner sheath on the fire-retardant band, wrapped aluminium-plastic tape screen extrudes the halogen-free and low-smoke flame-retardant polyolefin oversheath on the inner sheath on the composite band screen.
2, fire isolation layer fire-proof digital signal cable according to claim 1 is characterized in that the polyester band covering on the described line group, and interior polyester band covering is vertical covering, and outer polyester band covering is a lapping layer.
3, fire isolation layer fire-proof digital signal cable according to claim 1 is characterized in that four eradication edge cores of described line group are shared out bonus, green, white, Lan Si kind color, the position quadrate.
4, fire isolation layer fire-proof digital signal cable according to claim 1 is characterized in that described being twisted on the cable core with band carry out extruding refuge floor in the aluminium hydroxide sizing material again after fine pith ties up on cable core.
5, fire isolation layer fire-proof digital signal cable according to claim 1 is characterized in that wrapped mica tape flame retardant coating is double-deck mica tape on the described interior refuge floor, and the rate of putting up reaches 50%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100405598A CN100349233C (en) | 2005-06-17 | 2005-06-17 | Fire isolation layer fire-proof digital signal cable |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100405598A CN100349233C (en) | 2005-06-17 | 2005-06-17 | Fire isolation layer fire-proof digital signal cable |
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| CN1719552A CN1719552A (en) | 2006-01-11 |
| CN100349233C true CN100349233C (en) | 2007-11-14 |
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| CNB2005100405598A Active CN100349233C (en) | 2005-06-17 | 2005-06-17 | Fire isolation layer fire-proof digital signal cable |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101847461A (en) * | 2010-04-20 | 2010-09-29 | 上海索谷电缆集团有限公司 | Silicone rubber insulating fire-resisting flexible cable |
| CN101834033A (en) * | 2010-05-24 | 2010-09-15 | 常熟泓淋电线电缆有限公司 | Data transmission cable |
| CN102354552A (en) * | 2011-08-31 | 2012-02-15 | 江苏耐安特种电缆有限公司 | Ultralow-temperature cable and manufacturing process thereof |
| CN102646468A (en) * | 2012-04-25 | 2012-08-22 | 安徽宏源特种电缆集团有限公司 | Electromagnetic double-shielded low-noise radio-frequency cable used for nuclear power station |
| CN102637478A (en) * | 2012-05-04 | 2012-08-15 | 无锡市恒汇电缆有限公司 | Fire-resistant inflaming retarding high-voltage cable |
| CN102737774A (en) * | 2012-07-23 | 2012-10-17 | 安徽江淮电缆集团有限公司 | Novel cable for computer |
| CN104637589A (en) * | 2013-11-14 | 2015-05-20 | 成都捷康特科技有限公司 | Double-shielded fire-resistant cable |
| CN103824634B (en) * | 2014-02-25 | 2016-05-04 | 芜湖顺成电子有限公司 | A kind of low smoke and low halogen power cable |
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| US5253317A (en) * | 1991-11-21 | 1993-10-12 | Cooper Industries, Inc. | Non-halogenated plenum cable |
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Patent Citations (6)
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| US5253317A (en) * | 1991-11-21 | 1993-10-12 | Cooper Industries, Inc. | Non-halogenated plenum cable |
| US5576515A (en) * | 1995-02-03 | 1996-11-19 | Lucent Technologies Inc. | Fire resistant cable for use in local area networks |
| CN2414495Y (en) * | 1999-05-31 | 2001-01-10 | 安徽华海特种电线电缆厂 | High-temp resistant cable for computer |
| CN1348858A (en) * | 2001-11-08 | 2002-05-15 | 河北宝丰线缆有限公司 | Organosilane crosslinked polyethylene power cable and its one-step three layer coextruding production process |
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| CN1719552A (en) | 2006-01-11 |
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