CN209591642U - A kind of 6 ~ 35kV of voltage rating polypropylene insulation halide-free low-smoke fireproof cable - Google Patents

Abstract

The utility model discloses a kind of 6~35kV of voltage rating polypropylene insulation halide-free low-smoke fireproof cables, the cable includes more metallic conductors, its every metallic conductor is successively coated with composite insulation layer, waterproof buffer layer and metal screen layer, wherein composite insulation layer is collectively constituted by conductor shield, insulating layer and three layers of insulation screen, further include the wrapping layer that more metallic conductors are coated togather, waterproof layer, armor and oversheath are successively coated with outside the wrapping layer.The cable has excellent waterproof and dampproof performance, and excellent fireproof performance.

Description

A kind of 6 ~ 35kV of voltage rating polypropylene insulation halide-free low-smoke fireproof cable

Technical field

The utility model relates to power cable technical fields, and in particular to a kind of 6~35kV of voltage rating polypropylene insulation Halide-free low-smoke fireproof cable.

Background technique

With the continuous progress of society, the raising of living standards of the people, people are increasingly heavier to the safety in life Depending on, but people, while pursuing high-quality life, enjoying the clusterings such as emporium, grand theater life, fire safety is also more next More important and urgent, comprehensive each conflagration is reported, wherein the spontaneous combustion of wire and cable and the fire that causes accounts for significant proportion, And cause the ratio of personnel itself injures and deaths also to occupy very big ratio because of the reason of wire and cable again in fire, for example, fiery Power transmission, which occurs, for the wire and cable that the calamity time very short after occurring bears power transmission interrupts, and causes elevator, illumination cannot be just Often work, and so that people is tried in any path one could without heeding which one chose and cause injures and deaths.

At present fire-resisting cable application range it is extensively, such as: TV station, hospital, cinema, mall, subway, tunnel, railway, Airport, station, large-scale Public Physical Education, public place of entertainment, large supermarket, hotel, skyscraper, military installations, nuclear power station, coal Mine, chemical industry, medicine, steel, metallurgy, ship, civilian etc..

The structure that usual fire-resisting cable uses is wrapped mica tape, and not only production efficiency is low, and control difficulty is big, quality Reliability is low, and mica tape cannot bear excessively high voltage.Mica tape will around conductive surface, however midium voltage cable insulation and Smooth rounding is wanted at interface between conductor, is had one layer to extrude semi-conductive layer, is prevented partial discharge amount excessive, if Mica tape existed Conductive surface, it will cause cable local discharge amount exceeded, critical defect occur.

In addition, being hardened after mica tape burning, embrittlement, it is easy to fall off.

According to investigations, with the development of skyscraper with the raising of fire-protection rating and the reinforcement of people's awareness of safety, it is middle pressure it is resistance to Thermoelectricity cable comes into being, and dosage also increases sharply, but currently without it is middle pressure fire-resisting cable country and professional standard and in Press fire resistance test method standard, external also not similar product standard and test method standard, and voltage rating 0.6/1kV and During low-voltage cable fire resistance test method standard GB/T19216.21/IEC 60331-21:1999 below cannot accurately reflect The fire-resistance property of voltage cable.

Utility model content

In order to overcome the above technical defects, the utility model provide a kind of 6~35kV of voltage rating polypropylene insulation without Halogen low-smoke fireproof cable, the cable have excellent waterproof and dampproof performance, and excellent fireproof performance.

In order to reach above-mentioned technical effect, the utility model provide a kind of 6~35kV of voltage rating polypropylene insulation without Halogen low-smoke fireproof cable, the cable include more metallic conductors, and every metallic conductor is successively coated with composite insulation layer, prevents Water buffer layer and metal screen layer, wherein composite insulation layer is by conductor shield, insulating layer and three layers common group of insulation screen At further including the wrapping layer that more metallic conductors are coated togather, waterproof layer, armor be successively coated with outside the wrapping layer And oversheath.

Further technical solution is that the insulating layer uses polypropylene material, the conductor shield and insulation shielding Layer is made of polypropylene and conductive black mixing, and the conductor shield, insulating layer and insulation screen squeeze out be coated on simultaneously Metallic conductor surface, and bonded between three layers close.

Further technical solution is that the waterproof buffer layer is that wrapped one layer of semiconductive resistance is overlapped outside insulation screen Water expansion buffer band, overlapping overlap rate are 20%.

Further technical solution is that the metal screen layer is to be overlapped using annealed copper band around waterproof buffer layer Outside, it is overlapped overlap rate 15%.

Further technical solution is that the wrapping layer is led using two layers of waterstop overlapping around the twisted metal contracted In vitro.

Further technical solution is that the waterproof layer is polypropylene waterproof layer.

Further technical solution is, the armor is using the double-deck steel-tape armouring, and it is swollen to block water in steel band internal layer longitudinal wrap Expansible band, wrapped block water of outer layer expand band.

Further technical solution is that the oversheath uses halogen-free and low-smoke flame-retardant polyolefin material.

In the utility model, metallic conductor is strands circle type structure, and is all made of molded line and is twisted, appearance circle Whole, resistivity is far below standard specified value, and electric conductivity is excellent.Composite insulation layer is by conductor shielding, insulating layer, insulation shielding three Layer collectively constitutes, and insulating layer uses polypropylene, and conductor shielding and insulation shielding are mixed with conductive black by polypropylene and formed, conductor Shielding, insulating layer, insulation shielding squeeze out simultaneously is coated on conductive surface, and bonds between three layers close.Extrusion process does not need High temperature and pressure vulcanization, it is energy saving, and the exhaust gas without chemical reaction generates, environmental sound.It is overlapped outside insulation shielding wrapped One layer of semiconductive blocks water expansion buffer band, is overlapped overlap rate 20%, and expansion rate of water absorption can effectively prevent moisture up to 7~10 times Longitudinal sprawling.Metal screen layer is overlapped outside waterproof buffer layer using annealed copper band, is overlapped overlap rate 15%, can effectively be hindered Only ground protection of the electric field to extraneous interference, when at the same time as cable fault.After metallic conductor is using three metallic shields Cable core twisted synthesizing cable, filling blocks water snub rope between cable core, and wrapped wrapped using two layers of waterstop overlapping, which can effectively hinder The longitudinal sprawling of sealing point.A layer polypropylene waterproof layer is extruded after stranding, can be prevented inside moisture radial penetration to cable core, simultaneously Prevent armouring tape or external sharp objects damage cable core.For the cable for needing buried-pipe laying, using the double-deck steel-tape armouring, and It blocks water in steel band internal layer longitudinal wrap and expands band, wrapped block water of outer layer expands band, then can be used as longitudinal waterproof layer after oversheath damage.Outside Restrictive coating use low-heat burst size the termite-proof halogen-free and low-smoke flame-retardant polyolefin material of protection against rodents, this kind of material have protection against rodents prevent it is white Ant, low cigarette, Halogen, fire-retardant characteristic, while Heat liberation unit is low when the material combustion, is not easy the surrounding articles that ignite, it is safer Reliably.

In conclusion the utility model has the following beneficial effects: that the cable can carry out acid and alkali-resistance laying, have excellent Waterproof performance does not influence insulation resistance, humidity resistance is excellent, and water tree resistant property is excellent, dielectric properties for a long time and contact with moisture It is not influenced with high-frequency insulation and by humidity, more reliable guarantee is provided power supply line.Also have good flame retardant property and Can be with high temperature resistant, high temperature resistant is up to 105~120 DEG C, and current-carrying capacity can promote 15% or more, and Heat liberation unit is low when its burning, no It easily ignites surrounding articles, light transmittance is not less than 60% when burning, and the halogen acid gas escaped quantity of generation is not more than 5mg/g, escapes gas Body pH value is not less than 4.3, and conductivity is not more than 10 μ S/mm.Cable material therefor is green material, can be recycled and recycles.

Detailed description of the invention

Fig. 1 is the schematic cross-section of the cable of the utility model；

Wherein, 1- metallic conductor, 2- conductor shield, 3- insulating layer, 4- insulation screen, 5- waterproof buffer layer, 6- gold Belong to shielded layer, 7- wrapping layer, 8- waterproof layer, 9- armor, 10- oversheath.

Specific embodiment

Embodiment 1

As shown in Figure 1, the utility model provides a kind of 6~35kV of voltage rating polypropylene insulation LSOH anti-flaming electricity Cable, the cable include more metallic conductors, and every metallic conductor is successively coated with composite insulation layer, waterproof buffer layer and gold Belong to shielded layer, wherein composite insulation layer is collectively constituted by conductor shield, insulating layer and three layers of insulation screen, and further including will be more The wrapping layer that root metallic conductor is coated togather, the wrapping layer are successively coated with waterproof layer, armor and oversheath outside.It is described Insulating layer is made of using polypropylene material, the conductor shield and insulation screen polypropylene and conductive black mixing, institute It states conductor shield, insulating layer and insulation screen while squeezing out and be coated on metallic conductor surface, and bonded between three layers close. The waterproof buffer layer is to be overlapped wrapped one layer of semiconductive outside insulation screen to block water expansion buffer band, and overlapping overlap rate is 20%.The metal screen layer is the overlapping overlap rate 15% using the overlapping of annealed copper band outside waterproof buffer layer.It is described around Covering is using two layers of waterstop overlapping outside the twisted metallic conductor contracted.The waterproof layer is polypropylene waterproof layer.Institute Armor is stated using the double-deck steel-tape armouring, and blocks water in steel band internal layer longitudinal wrap and expands band, wrapped block water of outer layer expands band.It is described outer Sheath uses halogen-free and low-smoke flame-retardant polyolefin material.

Although reference be made herein to the utility model is described in the explanatory embodiment of the utility model, above-described embodiment The only preferable embodiment of the utility model, the embodiments of the present invention are simultaneously not restricted to the described embodiments, it should Understand, those skilled in the art can be designed that a lot of other modification and implementations, these modifications and implementations will be fallen Within scope and spirit disclosed in the present application.

Claims (4)

1. a kind of 6~35kV of voltage rating polypropylene insulation halide-free low-smoke fireproof cable, which is characterized in that the cable includes more Metallic conductor, every metallic conductor is successively coated with composite insulation layer, waterproof buffer layer and metal screen layer, wherein compound Insulating layer is collectively constituted by conductor shield, insulating layer and three layers of insulation screen, further includes being coated on more metallic conductors Wrapping layer together, the wrapping layer are successively coated with waterproof layer, armor and oversheath outside, and the waterproof buffer layer is exhausted It is overlapped wrapped one layer of semiconductive outside edge shielded layer to block water expansion buffer band, overlapping overlap rate is 20%, and the wrapping layer uses two For the overlapping of layer waterstop outside the twisted metallic conductor contracted, the waterproof layer is polypropylene waterproof layer, and the armor is adopted It with the double-deck steel-tape armouring, and blocks water in steel band internal layer longitudinal wrap and expands band, wrapped block water of outer layer expands band.

2. 6~35kV of voltage rating polypropylene insulation halide-free low-smoke fireproof cable according to claim 1, feature exist In the insulating layer uses polypropylene material, and the conductor shield, insulating layer and insulation screen squeeze out be coated on gold simultaneously Belong to conductive surface, and is bonded between three layers close.

3. 6~35kV of voltage rating polypropylene insulation halide-free low-smoke fireproof cable according to claim 1, feature exist In the metal screen layer is the overlapping overlap rate 15% using the overlapping of annealed copper band outside waterproof buffer layer.

4. 6~35kV of voltage rating polypropylene insulation halide-free low-smoke fireproof cable according to claim 1, feature exist In the oversheath uses halogen-free and low-smoke flame-retardant polyolefin material.