CN206021936U - A kind of high-performance track traffic DC traction cable - Google Patents

Abstract

The utility model discloses a kind of high-performance track traffic DC traction cable, including conductor, rubber insulation, block water fire-retardant composite band and oversheath, rubber insulation is coated on the outside of conductor, the fire-retardant composite band that blocks water is coated on the outside of rubber insulation, oversheath is coated on the outside of the fire-retardant composite band that blocks water, longitudinal water-blocking structure is equipped between conductor and conductor and rubber insulation, and the fire-retardant composite band that blocks water includes glass layer and is separately positioned on the water blocking layer and flame-retardant layer of glass layer both sides.Rubber insulation of the present utility model is made using modified EPT rubber, with superior electric property, ensure that insulating barrier is not breakdown；The fire-retardant composite band that blocks water can effectively act as blocking water, flame retardant effect；Oversheath is made up of ethylene-vinyl acetate and polyolefin elastomer mixture, with excellent pliability, weatherability, resistance to ag(e)ing, LSOH anti-flaming characteristic and protection against rodents, termite resistance energy.

Description

A kind of high-performance track traffic DC traction cable

Technical field

This utility model is related to track traffic cable technical field, and more particularly to a kind of high-performance track traffic is led with direct current Draw cable.

Background technology

In recent years, with the progress and the extensive application of DC traction equipment of technology of track traffic, domestic existing minority Enterprise has carried out the exploitation of direct current cables and has put into use.But in actual use, partial domestic direct current cables is present Some shortcomings, by MTR's feedack, summarize and obtain following subject matter：

1st, cable jacket cracking：Have plenty of that material selection is improper, have plenty of the stress relieving produced during bending not, from And cause oversheath cracking after cable operation a period of time；

2nd, cable insulation punctures：Orbit traffic direct current cable is mostly using crosslinked polyethylene and ethylene propylene diene rubber as exhausted Edge material, it is well known that crosslinked polyethylene or ethylene propylene diene rubber belong to polymer, insulating material of polymer is excellent with which Processing, dielectric, hot property and be widely used.But they processing, manufacture and use during charge residue, electrode injection Or the polarization that causes because material is not pure or polarization problem, accumulation of the space charge in insulant can be all caused, so as to Reduce its dielectric properties, or even puncture.

3rd, cable flexibility is not good enough：Harder cable material cable laying operation inconvenience, it is impossible to meet soft, bending radius little Use requirement；

4th, cable performance is not enough：The waterproof of cable, protection from weathering, anti-ultraviolet, rat-and-ant proof, oil resistant, heat-resisting, cold-resistant and LSOH anti-flaming etc. characteristic is perfect not enough, it is impossible to fully meet the harsh use environment condition of subway.

Utility model content

For solving above-mentioned technical problem, the utility model discloses a kind of high-performance track traffic DC traction cable, Including conductor, rubber insulation, block water fire-retardant composite band and oversheath, and the rubber insulation is coated on the outside of conductor, institute State the fire-retardant composite band that blocks water to be coated on the outside of rubber insulation, the oversheath is coated on the outside of the fire-retardant composite band that blocks water, described Longitudinal water-blocking structure is equipped between conductor and conductor and rubber insulation, and the fire-retardant composite band that blocks water includes glass Glass fibrous layer and it is separately positioned on the water blocking layer and flame-retardant layer of glass layer both sides.

Used as further improvement of the utility model, the conductor is closed by the tin plating soft single round copper wire bundle strand of multiply and is formed Strand.

Used as further improvement of the utility model, the longitudinal water-blocking structure is to be longitudinally continuous blocking water for cladding along strand Band.

Used as further improvement of the utility model, the water blocking layer is by sodium acrylate, monomeric acrylamide, crosslinking The water blocking layer of agent, initiator and deionized water configuration.

Used as further improvement of the utility model, the flame-retardant layer is the flame-retardant layer of inorganic hydroxide composition.

Used as further improvement of the utility model, it is 0.2- altogether to be provided with 2 thickness degree on the outside of the rubber insulation The fire-retardant composite band that blocks water of 0.25mm, and put up lapping layer of the coverage rate not less than 30%.

Used as further improvement of the utility model, the rubber insulation is modified EPT rubber insulation.

Used as further improvement of the utility model, the oversheath is by ethene-vinyl acetate and polyolefin elastomer The sheath that mixture is made.

The beneficial effects of the utility model are：

Rubber insulation of the present utility model is made using modified EPT rubber, with superior electric property, energy Enough overcome the space charge of DC electric field, it is ensured that insulating barrier is not breakdown；The three-decker of the fire-retardant composite band that blocks water can be effective Play block water, flame retardant effect；Oversheath is made up of ethene-vinyl acetate and polyolefin elastomer mixture, with excellent Pliability, weatherability, resistance to ag(e)ing, LSOH anti-flaming characteristic and protection against rodents, termite resistance energy.

Description of the drawings

For the technical scheme being illustrated more clearly that in this utility model embodiment, below will be to making needed for embodiment Accompanying drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present utility model, For those of ordinary skill in the art, without having to pay creative labor, can be being obtained according to these accompanying drawings Obtain other accompanying drawings.

Fig. 1 is cross section structure schematic diagram of the present utility model；

Fig. 2 is to block water the cross section structure schematic diagram of fire-retardant composite band.

Labelling in figure：1- conductors；2- rubber insulations；3- blocks water fire-retardant composite band；31- glass layers；32- blocks water Layer；33- flame-retardant layers；4- oversheaths；5- waterstops.

Specific embodiment

Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is carried out Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of this utility model, rather than whole Embodiment.

As shown in figure 1, a kind of high-performance track traffic DC traction cable, including conductor 1, rubber insulation 2, blocks water Fire-retardant composite band 3 and oversheath 4, rubber insulation 2 are coated on the outside of conductor 1, and it is exhausted that the fire-retardant composite band 3 that blocks water is coated on rubber On the outside of edge layer 2, oversheath 4 is coated on the outside of the fire-retardant composite band 3 that blocks water, inside conductor 1 and conductor 1 and rubber insulation 2 it Between be equipped with longitudinal water-blocking structure.

As shown in Fig. 2 the fire-retardant composite band 3 that blocks water includes glass layer 31 and is separately positioned on 31 liang of glass layer The water blocking layer 32 and flame-retardant layer 33 of side；Water blocking layer 32 be by sodium acrylate, monomeric acrylamide, cross-linking agent, initiator and go from The water blocking layer of sub- water configuration；Flame-retardant layer 33 is the flame-retardant layer of inorganic hydroxide composition.

In subway engineering, cable generally using system of layings such as direct-burried, cable duct, tunnels, was installed in cable construction In journey, termination easily intakes；Simultaneously cable in use unavoidably with water directly contact, or even can short-term or long period of soaking in water, And water is to affect the long-life key factor of cable, because water enters cable core and can cause cable premature failure, very To puncturing.

Conductor of the present utility model 1 is the strand closed by the tin plating soft single round copper wire bundle strand of multiply, each twisted layer of strand it Between and conductor 1 and rubber insulation 2 between be longitudinally continuous cladding waterstop 5, so can prevent longitudinal water translocation, play The effect of longitudinal water-blocking；The fire-retardant composite band 3 that blocks water for being provided with 2 thickness degree on the outside of rubber insulation 2 altogether for 0.2-0.25mm, and take Lapping layer of the lid coverage rate not less than 30%, plays radial water-resisting effect；Above-mentioned twice waterproof construction enters cable for preventing moisture Core provides reliable barrier.

Waterstop 5 contains the compositions such as sodium acrylate, monomeric acrylamide, cross-linking agent, initiator, deionized water composition, its Feature is water-swellable, can function well as block-water effect, and process is simple.

In order that cable has softness, physical and mechanical propertiess, anti-atmospheric aging performance, oil resistant, block water fire resistance And protection against rodents, the characteristic such as termite-proof, oversheath of the present utility model 4 is by ethene-vinyl acetate-polyolefin elastomer mixture system Into.

Rubber insulation 2 is modified EPT rubber insulation, can be effectively improved its space-charge accumulation problem.

Ethylene propylene diene rubber (EPDM) is the terpolymer of ethylene, propylene and non-conjugated diene hydrocarbon, and which is topmost Characteristic is exactly superior resistance to oxidation, ozone-resistant and corrosion resistance, at the same also have excellent thermostability and against weather and Steady chemical structure, is more applied to electric wire with its excellent high insulation resistivity particularly in terms of electric property.

The insulation of DC traction cable typically adopts two kinds of insulant of crosslinked polyethylene and EP rubbers at present.Crosslinking is poly- Ethylene insulation is monolithic devices cross-linked structure, belongs to non-polar polymer.The cable capacitor larger equivalent to itself, direct current After transmission has a power failure, equivalent to by a capacitor charging complete, although conductor thread core has carried out grounding, but does not have energy Enough effectively discharged, substantial amounts of direct current energy is still present in cable, that is, so-called " space charge ", these are empty Between electric charge will not be consumed due to dielectric loss as ac power cable, but cause at insulation defect a large amount of just, The aggregation of negative charge.Space charge prolongation over time and be multiplied, when its electric field intensity is more than the nominal DC of cable During the tolerance pulse voltage of voltage and insulation, crosslinked polyetylene insulated direct current cables is then breakdown.

Ethylene propylene diene rubber (EPDM) although without the like that higher electrical property of crosslinked polyethylene, in its mechanism that insulate On can overcome the space charge of DC electric field.EP rubbers is the copolymer of ethylene and propylene, is the medium of the resistance to electricity of low pole, Because the presence of molecular polarity, the addition of the materials such as filler and cross-linking agent is added, constitute the exhausted of uniform mixing polarizable medium Edge body.From from the point of view of solid dielectric physics, space charge can be absorbed by the positive and negative space of polarizable medium, be reached Local electric quantity balancing, will not cause dielectric to form charge pathway and puncture.

Oversheath 4 is the sheath being made up of ethene-vinyl acetate and polyolefin elastomer mixture.

Ethene-vinyl acetate (EVA) is the polar polymer of Halogen, can be compatible with multiple material, has good mechanical thing Rationality energy, electric property and splendid mixing and expressing technique.EVA is manufacture cable insulation, protective cover material, low-smoke halogen-free flame retardant material The base material indispensable with oxygen barrier layered material.

Polyolefin elastomer (POE) is to realize the thermoplastic elastomehc of in-situ polymerization using the ethylene and octene of metallocene catalyst Gonosome, its thermostability, tolerance to cold, weatherability, resistance to ag(e)ing are excellent, the general physical property also with thermoplastic elastomer (TPE), such as molding Property, waste material recycle and cured properties etc., and relative density is little, thus volume is cheap.

The cooperation of EVA and POE bi-materials, had both highlighted the good physical and mechanical propertiess of EVA, had highlighted and low smoke, zero halogen The compatibility of the multiple material such as fire-retardant, protection against rodents is termite-proof；Excellent thermostabilitys of POE, tolerance to cold, weatherability, resistance to old are continued again Change performance, fillibility is good, and price is low；The defect that EVA is heat-resisting, cold-resistant and pliability is not so good is also overcomed, has evaded POE again resistance to The unfavorable factor such as oily, pressure compression permanent deformation and abrasion performance difference.

Preferred embodiment of the present utility model is the foregoing is only, not in order to limit this utility model, all at this Within the spirit and principle of utility model, any modification, equivalent substitution and improvements that is made etc. should be included in this utility model Protection domain within.

Claims (6)

1. a kind of high-performance track traffic DC traction cable, including conductor, rubber insulation, the fire-retardant composite band that blocks water and Oversheath, it is characterised in that the rubber insulation is coated on the outside of conductor, it is exhausted that the fire-retardant composite band that blocks water is coated on rubber On the outside of edge layer, the oversheath is coated on the outside of the fire-retardant composite band that blocks water, the conductor and conductor and rubber insulation Between be equipped with longitudinal water-blocking structure, the fire-retardant composite band that blocks water includes glass layer and is separately positioned on glass fibre The water blocking layer and flame-retardant layer of layer both sides.

2. high-performance track traffic DC traction cable according to claim 1, it is characterised in that the conductor is served as reasons The strand that the tin plating soft single round copper wire bundle strand of multiply is closed.

3. high-performance track traffic DC traction cable according to claim 1, it is characterised in that the longitudinal water-blocking Structure is the waterstop for being longitudinally continuous cladding along strand.

4. high-performance track traffic DC traction cable according to claim 3, it is characterised in that the flame-retardant layer is The flame-retardant layer of inorganic hydroxide composition.

5. high-performance track traffic DC traction cable according to claim 1, it is characterised in that the rubber-covered The fire-retardant composite band that blocks water that layer outside is provided with 2 thickness degree altogether for 0.2-0.25mm, and it is wrapped not less than 30% to put up coverage rate Layer.

6. high-performance track traffic DC traction cable according to claim 5, it is characterised in that the rubber-covered Layer is modified EPT rubber insulation.