CN2817009Y - Nove fire-insulation layer fire-retardant digital singal cable - Google Patents

Abstract

The utility model relates to a novel fire-resistant digital signal cable with a fire-isolating layer, which belongs to the technical field of a cable. An insulation layer of foamed polyethylene materials is squeezed and wrapped on an oxygen-free circular copper wire conductor by adopting a three-layer total squeezing method of husk-bubbles-husk, and four insulated cores are stranded into stranding quads on which yarn are bound. A plurality of quads are stranded into a cable core on which an inner fire-isolating layer of aluminum hydroxide sizing materials is squeezed and wrapped, a mica-tape fire-resistant layer is lapped on the inner fire-isolating layer, an outer fire-insulating layer of aluminum hydroxide sizing materials is squeezed and wrapped on the mica-tape fire-resistant layer, and a fire-retardant lapping tape is lapped, a halogen-free, low-smoke and fire-retardant polyolefin inner sheath is squeezed, a shielding layer with an aluminum-plastic composite tape is lapped and a halogen-free, low-smoke and fire-retardant polyolefin outer sheath is squeezed on the outer fire-insulating layer orderly. The utility model has the advantages of novel and reasonable structure, scientific material adoption, strong electromagnetic interference resistance, high using frequency, low transmission attenuation, low capacity and accurate and stable signal transmission. The utility model is suitable for system equipment of places such as light rails, subways, etc.

Description

Fire isolation layer fire-proof digital signal cable

Technical field

The utility model relates to the signal cable of a kind of structure of cable, particularly fire safe type, belongs 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.

The utility model content

It is good that the purpose of this utility model provides a kind of fire resistance, and the signal transmission is stable fire isolation layer fire-proof digital signal cable accurately.

The purpose of this utility model is to realize like this, fire isolation layer fire-proof digital signal cable, comprise conductor, insulating barrier, comprehensive flame retardant coating, screen and sheath, it is characterized in that being provided with the quad of the position quadrate that insulated electric conductor (insulated wire cores) is twisted into, the cable core that quad is twisted into is provided with the aluminium hydroxide sizing material that adopts plsitive mold to extrude and makes interior refuge floor, the mica tape flame retardant coating is wrapped on interior refuge floor, on the mica tape flame retardant coating, be provided with and adopt refuge floor outside the aluminium hydroxide sizing material that plsitive mold extrudes, refuge floor is provided with wrapped fire-retardant band outside, on fire-retardant band, be provided with the halogen-free and low-smoke flame-retardant polyolefin inner sheath that extrudes, the aluminium-plastic tape screen is wrapped on inner sheath, extrudes the halogen-free and low-smoke flame-retardant polyolefin oversheath on the aluminium-plastic tape screen.

Described insulated electric conductor is that the anaerobic round copper wire is provided with the polyethylene foamed insulated with material layer that the three-layer co-extruded physical foam insulation technology of employing skin-bubble-Pi extrudes.Described quad is provided with polyester and pricks yarn.Described quad is provided with polyester and pricks the vertical covering of yarn, internal shield and interior polyester band (CV band), outer polyester band (CV band) lapping layer, and polyester bundle yarn, the vertical covering of interior polyester band, internal shield, outer polyester band lapping layer are successively set on the quad surface.Red, green, white, Lan Si kind color that the insulating barrier of the insulated electric conductor of described quad is provided with.Cable core in described in the refuge floor is provided with the band that fine pith is tied up.Wrapped mica tape flame retardant coating is double-deck mica tape on the described interior refuge floor, and the rate of putting up is 45-55%.

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 plsitive mold 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.

The utility model is rational in infrastructure simple, manufactures easily, and cost is low.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 electric conductor, thoroughly do away with the edge conductor with every group four and be twisted into stranded quad, four of quad is thoroughly done away with the dividend of edge conductor, green, white, Lan Si kind color, position quadrate.Wrapped polyester is pricked yarn and is pricked the yarn quad for 3 one-tenth on quad.Wrapped successively polyester is pricked yarn 3, the vertical covering 4 of vertical bag CV band, wrapped copper strips internal shield 5,6 one-tenth inner shield quads of wrapped CV band lapping layer on quad.Pricking yarn quads and two groups of inner shield quads 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 (7)

1, a kind of fire isolation layer fire-proof digital signal cable, comprise conductor, insulating barrier, flame retardant coating, screen and sheath, it is characterized in that being provided with the quad of the position quadrate that insulated electric conductor is twisted into, the cable core that quad is twisted into is provided with the aluminium hydroxide sizing material that adopts plsitive mold to extrude and makes interior refuge floor, the mica tape flame retardant coating is wrapped on interior refuge floor, on the mica tape flame retardant coating, be provided with the aluminium hydroxide sizing material that adopts plsitive mold to extrude do outside refuge floor, refuge floor is provided with wrapped fire-retardant band outside, on fire-retardant band, be provided with the halogen-free and low-smoke flame-retardant polyolefin inner sheath that extrudes, the aluminium-plastic tape screen is wrapped on inner sheath, extrudes the halogen-free and low-smoke flame-retardant polyolefin oversheath on the aluminium-plastic tape screen.

2, fire isolation layer fire-proof digital signal cable according to claim 1 is characterized in that described insulated electric conductor is that the anaerobic round copper wire is provided with the polyethylene foamed insulated with material layer that the three-layer co-extruded physical foam insulation technology of employing skin-bubble-Pi extrudes.

3, fire isolation layer fire-proof digital signal cable according to claim 1 is characterized in that described quad is provided with polyester and pricks yarn.

4, fire isolation layer fire-proof digital signal cable according to claim 1, it is characterized in that described quad is provided with polyester and pricks the vertical covering of yarn, internal shield and polyester band, polyester band lapping layer, polyester bundle yarn, the vertical covering of polyester band, internal shield, polyester band lapping layer are successively set on the quad surface.

5, fire isolation layer fire-proof digital signal cable according to claim 1 is characterized in that the insulating barrier of the insulated electric conductor of described quad is provided with red, green, white, Lan Si kind color.

6, fire isolation layer fire-proof digital signal cable according to claim 1 is characterized in that the cable core in the described interior refuge floor is provided with the band that fine pith is tied up.

7, 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 is 45-55%.