CN207052350U - A kind of self-shield refractory cable - Google Patents

Abstract

The utility model discloses a kind of self-shield refractory cable, including, cable stock, it is characterised in that also include, external protection；The external protection is set on the outside of cable stock, is fixedly connected with the cable stock by being connected the wing；The sand that filling is made up of the particle between 0.1-0.25 millimeter of diameter in the space of the cable stock and the external protection; ceramic cable in the utility model is when thermal-flame calcination; after external protection damage or after burning; fine sand flows out; the external protection of burning can be flowed out with fine sand and depart from cable stock; and during fine sand outflow, the intensity of a fire can be put out or reduced to the weak intensity of a fire.

Description

A kind of self-shield refractory cable

Technical field

It the utility model is related to power cable technical field, more particularly to a kind of self-shield refractory cable.

Background technology

Fire resisting cable refers to the cable that certain time safe operation can be kept in the case of flame combustion.Country of China mark Fire resistance test is divided to A, B two kinds of ranks by quasi- GB12666.6,950~1000 DEG C of A levels flame temperature, persistently for fiery time 90min, B 750~800 DEG C of flame temperature of level, persistently for fiery time 90min, during whole experiment, sample should bear specified as defined in product Magnitude of voltage.Ceramic cable is widely used in skyscraper, underground railway, undergrond street, large-scale power station and important industrial and mining enterprises Deng the place relevant with fire safety and fire-extinguishing and lifesaving.Cable fire resistance is improved for ensureing public place fire safety to pass It is important.And those skilled in the art are in development, generally use improves material to improve the fire resistance of ceramic cable. But existing ceramic cable be driven bearing by flame calcination, and can not actively be defended, to extend fire resistance period.

Utility model content

To solve ceramic cable fire time short technical problem in the prior art, the technical solution of the utility model is such as Under：

A kind of self-shield refractory cable in the utility model, including, cable stock, in addition to, external protection； The external protection is set on the outside of cable stock, is fixedly connected with the cable stock by being connected the wing；The cable stock With the sand that filling is made up of the particle between 0.1-0.25 millimeter of diameter in the space of the external protection.

Wherein, the cable stock is followed successively by from outside to inside, low smoke and zero halogen external sheath layer, steel-tape armouring layer, outer fiber bag Belt, the Tao Kai ceramic fire-resistant polyolefin oxygen barriers bed of material, high oxygen index (OI) oxygen barrier layer, interior fiber belting layer, alkali-free glass fiber dimension yarn are filled out Fill layer and cable core body；The cable core body is three, and three cable core bodys are tieed up yarn packed layer by alkali-free glass fiber and isolated； The Tao Kai ceramics fire-resistant polyolefin oxygen barrier bed of material outer surface opens up threaded notch.

Wherein, V-shaped groove is radially opened up along the cable stock, Tao Kai ceramic polyolefin is filled in the V-shaped groove Form V-type ring.

Wherein, the V-shaped groove is multigroup.

Wherein, the V-type ring opens up some stomatas.

Wherein, the cable core body include steel band screen layer, external shielding layer, crosslinked polyetylene insulated layer, internal shield and Conductor.

Wherein, the bottom land of the V-shaped groove is located at the Tao Kai ceramic fire-resistant polyolefin oxygen barrier bed of materials.

Wherein, the oxygen index (OI) of the high oxygen index (OI) oxygen barrier layer is more than 38, thickness 2-4mm.

Wherein, the thickness 5.5-6.5mm of the Tao Kai ceramics fire-resistant polyolefin oxygen barrier bed of material.

Ceramic cable in the utility model, compared with prior art, its advantage is：

Ceramic cable in the utility model is when thermal-flame calcination, after external protection damage or after burning, fine sand Outflow, the external protection of burning can be flowed out with fine sand and depart from cable stock, and during fine sand outflow, the weak intensity of a fire can be put out Or reduce the intensity of a fire.

Brief description of the drawings

Fig. 1 is the structural representation of ceramic cable in the utility model；

Fig. 2 is Fig. 1 A-A direction views；

Fig. 3 is the structural representation of the Tao Kai ceramics fire-resistant polyolefin oxygen barrier bed of material of the present utility model.

Embodiment

Below in conjunction with accompanying drawing of the present utility model, the technical solution of the utility model is clearly and completely described. Based on the embodiment in the utility model, what those of ordinary skill in the art were obtained under the premise of creative work is not made Every other embodiment, belong to the scope of the utility model protection.

As Figure 1-3, a kind of self-shield refractory cable, cable stock are followed successively by from outside to inside, low smoke and zero halogen External sheath layer 1, steel-tape armouring layer 2, outer fiber belting layer 3, the Tao Kai ceramic fire-resistant polyolefin oxygen barriers bed of material 4, high oxygen index (OI) every Oxygen layer 5, interior fiber belting layer 6, alkali-free glass fiber dimension yarn packed layer 7 and cable core body, cable core body include steel band screen layer 8, outer Screen layer 9, crosslinked polyetylene insulated layer 10, internal shield 11 and conductor 12.The cable core body is three, three cables Core body is tieed up yarn packed layer 7 by alkali-free glass fiber and isolated.The outer surface of the Tao Kai ceramic fire-resistant polyolefin oxygen barriers bed of material 4 opens up screw thread and cut Mouthful.So that in the case where ensureing fire resistance, cable bending degree is improved.By opening up threaded notch so that ceramic cable Integral bending Degree of wearing improves 3-6 ° relative to existing ceramic cable, is more favorable for connecting up, suitable for wider array of working environment.Also include, outside Protective layer 15；External protection 15 is set on the outside of cable stock, is fixedly connected with cable stock by being connected the wing 16；Cable stock With the sand that filling is made up of the particle between 0.1-0.25 millimeter of diameter in the space of external protection 15.External protection can be with line The same length of cable main body, it can also be only arranged in cable stock and easily catch fire or focus on to need certain section to be protected.The both ends of external protection Face can ensure that sand will not flow out by rubber seal.Also other sealing means of the prior art may be selected, sand is fixed on line In the space of cable main body and external protection 15.Quality of rubber materials can be selected in external protection.Burnt when ceramic ignition of cable or by flame During burning, it can be damaged therewith after external protection catches fire.The external protection to catch fire can drop with sand, so as to delay fire resistance period. Or during calcination damage external protection, sand drippage will reduce flame size, or even knock down the flame.

The oxygen index (OI) of high oxygen index (OI) oxygen barrier layer 5 is more than 38, and the thickness of high oxygen index (OI) oxygen barrier layer 5 is 2-4mm.Tao Kai ceramics The thickness 5.5-6.5mm of the fire-resistant polyolefin oxygen barrier bed of material 4.Ceramic refers in high molecular polymer, such as plastics, rubber and thermoplastic Property elastomer, add functional material, in the case of the aerobic or anaerobic more than 300 DEG C, sinter adamantine ceramics into Shape inorganic matter housing supporter.Fire resisting is to be amenable to that high temperature or high temperature resistance must be lived, that is, meets standard within the regular hour The ability of stability, integrality thermal insulation and other expectation functions specified in fire resistance test；Oxygen index (OI) (OI) is in regulation bar Under part, sample maintains the minimum oxygen concentration needed for stable burning (having flame combustion) in N2 and O2 mixed airflows.It is to weigh High polymer combustibility；But combustibility is weighed nor absolute with oxygen index (OI), if the oxygen index (OI) of polyethylene is 17.4, The oxygen index (OI) of polystyrene is 18.1, and comparatively, polyethylene should be than polystyrene more easy firing, but actually polystyrene What is burnt is more violent, because polystyrene flame transmission speed is more fast again than polyethylene.This is due to the specific heat of polystyrene Hold and decomposition temperature is relatively low caused.In addition to oxygen index (OI), specific heat capacity, thermal conductivity, fusing point, decomposition temperature and the ignition of high polymer Temperature, flame propagation velocity, surface combustion speed also all reflect the combustibility of high polymer；Oxygen index (OI) is that having the feelings of flame To a sign of high polymer combustibility, the fireproof oxygen-separation layer of middle pressure fire resisting and the insulating refractory of low-voltage cable, base under condition It is in the case of nonflame, anaerobic on this；For Tao Kai ceramics fire-resistant polyolefin in the case of nonflame, anaerobic, temperature reaches 300 Start slowly to crust more than DEG C, temperature continues to raise, crust speed accelerate with the ramp-up rate of temperature, formed ceramic without Casing body supporter.Most important middle pressure fire-resisting cable design is also a bit the most key, seeks to accomplish to crosslinked polyethylene Insulating barrier carries out temperature protection, protects crosslinked polyetylene insulated layer in loading 10KV, 950~1000 DEG C × 90~180min of flame Under conditions of, internal crosslinked polyetylene insulated layer does not melt, and does not soften, and is delivered to crosslinked polyetylene insulated layer during off-test Temperature will be less than 160-180 DEG C, can so make it that crosslinked polyetylene insulated layer is protected well.Cable stock exists The common cooperation of above-mentioned sandwich construction, progressively absorbing and cooling temperature and insulation under, ensure that the temperature of crosslinked polyetylene insulated layer is less than 160-180 DEG C of requirement.The alkali-free glass fiber yarn main component of alkali-free glass fiber yarn packed layer is silica, is a kind of highly stable Inorganic material, nontoxic, heat resisting temperature will not produce harmful flue gas up to more than 650-1000 DEG C after heated；Alkali-free The section of glass fibre yarn is cylindrical, has space between every yarn after filling stranding, forms passage, this passage can play very well Thermolysis, heat caused by cable normal operation can pass through these various passages and alkali-free glass fiber yarn sheet Body is radiated；The heat that exterior conductive is come in during fire can also be conducted by these passages and glass fibre yarn.Interior fiber Belting layer and outer fiber belting layer carry out fire resisting guarantor also due to its excellent heat conduction, radiating and heat-resisting new energy to cable stock Shield.In order to ensure cable cut convenience, and cause section fire resistance it is stronger, along cable stock every 30m radially open up it is more Group V-shaped groove, the interior filling Tao Kai ceramics polyolefin of V-shaped groove form V-type ring 13.V-shaped groove when opening up, V-shaped groove Bottom land is located in the Tao Kai ceramic fire-resistant polyolefin oxygen barriers bed of material 4.When use, cutting V-shaped ring 13, you can smoothly to cable Cut.And cut surface by the V-type ring 13 that Tao Kai ceramic polyolefin is formed to Tao Kai ceramic fire-resistant polyolefin oxygen barrier material Layer 4 has bond strength preferably, and low smoke and zero halogen external sheath layer 1, steel-tape armouring layer 2 and outer fiber belting layer 3 are protected Shield.

In a kind of optional embodiment, the V-type ring opens up some stomatas.It is more favorable for radiating.Stomata opens up direction To be parallel with diametric(al).

It is described above, only specific embodiment of the present utility model, but the scope of protection of the utility model is not limited to In this, any one skilled in the art can readily occur in change in the technical scope that the utility model discloses Or replace, it should all cover within the scope of protection of the utility model.Therefore, the scope of protection of the utility model should be with the power The protection domain that profit requires is defined.

Claims (9)

1. a kind of self-shield refractory cable, including, cable stock, it is characterised in that also include, external protection；It is described External protection is set on the outside of cable stock, is fixedly connected with the cable stock by being connected the wing；The cable stock and institute State in the space of external protection the sand that filling is made up of the particle between 0.1-0.25 millimeter of diameter.

2. a kind of self-shield refractory cable according to claim 1, it is characterised in that the cable stock is by outer It is followed successively by interior, low smoke and zero halogen external sheath layer, steel-tape armouring layer, outer fiber belting layer, Tao Kai ceramic fire-resistant polyolefin oxygen barriers The bed of material, high oxygen index (OI) oxygen barrier layer, interior fiber belting layer, alkali-free glass fiber dimension yarn packed layer and cable core body；The cable core body is Three, three cable core bodys are tieed up yarn packed layer by alkali-free glass fiber and isolated；The Tao Kai ceramics fire-resistant polyolefin oxygen barrier Bed of material outer surface opens up threaded notch.

3. a kind of self-shield refractory cable according to claim 2, it is characterised in that along the cable stock footpath To V-shaped groove is opened up, filling Tao Kai ceramics polyolefin in the V-shaped groove forms V-type ring.

4. a kind of self-shield refractory cable according to claim 3, it is characterised in that the V-shaped groove is more Group.

5. a kind of self-shield refractory cable according to claim 4, it is characterised in that if the V-type ring opens up Dry gas hole.

6. a kind of self-shield refractory cable according to claim 5, it is characterised in that the cable core body includes Steel band screen layer, external shielding layer, crosslinked polyetylene insulated layer, internal shield and conductor.

A kind of 7. self-shield refractory cable according to claim 6, it is characterised in that the groove of the V-shaped groove Bottom is located at the Tao Kai ceramic fire-resistant polyolefin oxygen barrier bed of materials.

A kind of 8. self-shield refractory cable according to claim 7, it is characterised in that the high oxygen index (OI) oxygen barrier The oxygen index (OI) of layer is more than 38, thickness 2-4mm.

9. a kind of self-shield refractory cable according to claim 8, it is characterised in that the Tao Kai ceramics are resistance to The thickness 5.5-6.5mm of the fiery polyolefin oxygen barrier bed of material.