CN104299691A

CN104299691A - Flexible fireproof cable

Info

Publication number: CN104299691A
Application number: CN201410542577.5A
Authority: CN
Inventors: 邢军; 赵宇
Original assignee: JINAN SHENGTONG POWER CABLE Co Ltd
Current assignee: JINAN SHENGTONG POWER CABLE Co Ltd
Priority date: 2014-10-14
Filing date: 2014-10-14
Publication date: 2015-01-21
Anticipated expiration: 2034-10-14
Also published as: CN104299691B

Abstract

The invention proposes a flexible fireproof cable, which includes a cable core, a thermally non-collapsible filling layer, a waterproof layer, an outer barrier layer, and a sheath layer; the cable core includes a conductor from the inside to the outside, an inner barrier layer and an insulating layer; At least one cable core is wrapped inside the waterproof layer, and a filling layer is arranged between the waterproof layer and the cable core, and the filling layer is made of ceramic silica gel strips and glass fibers; Barrier layer, sheath layer. Under the premise of satisfying the high fire protection level, the present invention adopts traditional wrapping and cable forming processes for important structures such as internal and external barrier layers and thermal non-collapsing filling layers, effectively solving the need of expensive and complicated processes for existing fireproof cables The special equipment is difficult to manufacture, the metal sheath is hard, which is inconvenient for construction, and the existing flexible cables have low fire performance.

Description

A kind of flexible fire-proof cable

Technical field

The present invention relates to a kind of fireproof cable, particularly relate to a kind of flexible fire-proof cable, belong to cable production art.

Background technology

Along with the density of population increases the emergence with skyscraper, the security against fire facility in indoor place especially comes into one's own.Electric wire is as the basis of security against fire, and people have had stricter requirement to its fire protecting performance and convenience for construction etc.Fireproof cable conventional is at present mineral insulated cable, and structure is copper conductor, mineral insulation, copper sheath.Although such cable has stronger fire resistance property, expensive; Complex process needs special equipment manufacture difficulty large; Metallic sheath is hard brings inconvenience for construction, and especially lay difficulty in the place that construction area is less larger.

Also have some fire-resisting cables to contain mica composite tape structure, rely on heat-resisting quantity and the flame resistance of mica, play the resistance to fire action to electric wire.But mica characteristic is highly brittle, in system band and wrapped process, percent defective is high, and can not do too thick of mica tape otherwise cannot bend or bending time can rupture.When high temperature, the macromolecular material of mica attachment can decompose thawing, loses de-protected mica and is easy to be damaged thus loses protective effect to conductor.Therefore conventional fire-resisting cable is difficult to work in case of fire 90 minutes, does not reach corresponding fire resistant requirements.

Summary of the invention

The present invention is directed to the deficiency that prior art exists, provide a kind of processing simple, production efficiency is high, the flexible fire-proof cable of fire protecting performance excellence.

The technical scheme that the present invention solves the problems of the technologies described above is as follows: a kind of flexible fire-proof cable, comprise cable core, packed layer, watertight composition, outer barrier layer, restrictive coating, described cable core comprises conductor, inner barrier layer and insulating barrier from inside to outside, at least one cable core is enclosed with in described watertight composition, be provided with packed layer between watertight composition and cable core, described watertight composition is enclosed with outer barrier layer, restrictive coating outward successively.

Further, described conductor is single or many twisted copper conductors, and the lay ratio of described twisted copper conductors is not less than 35.

Further, described inner barrier layer comprises ceramic silica gel fire resistant belt, and be bonded by one deck pottery silica gel and layer of glass, thickness is 0.2-0.5mm.

Further, described inner barrier layer bag adopts two-way wrapped mode to wrap up.

Further, described insulating barrier is low-smoke non-halogen flame-retardant cross-linked polyethylene layer.

Further, described packed layer is closed by glass cord and ceramic silica gel strip mechanical winding and works out.

Further, described watertight composition comprises the glass fiber tape of radial inner one deck and the metallized polyester band of the outer one deck of radial direction, and every ply rate is greater than 30%, the two-way wrapped mode of its two-layer employing, every ply place apart windings.

Further, described outer barrier layer is ceramic silica gel fire resistant belt, and thickness is 0.6-0.8mm, and adjacent layer adopts rightabout to be wound around, every ply place apart windings.

Further, can optionally add establishment armour according to the applied environment of cable, described braiding armour is many metal knitted silks, and described metal knitted silk is steel wire, copper wire or tin plated wire, diameter 0.15-0.2mm, and establishment density is not less than 80%.

Further, described sheath is low-smoke non-halogen flame-retardant crosslinked polyethylene.

The invention has the beneficial effects as follows: compare with other technology, the present invention has following features:

One, in the present invention, twisted copper conductors adopts large lay ratio structure.When in case of fire, conductor high-temperature expansion, prevents crowded bad inner barrier layer.

Two, inner barrier layer of the present invention, outer barrier layer, packed layer adopt ceramic silica gel material.This material-70 ~ 210 degree time softness, flexible, intensity is high, mechanicalness insulating properties is excellent.Make the present invention have the features such as softness, sound insulation, shock resistance, construction is laid convenient; Simply, the cost of material is low for ceramic silica gel fire guard and gasket for packing production and processing, adopting traditional wrapped cabling process just can add cable to central without the need to using Special Equipment, reducing processing cost; The wrapped tight seal of ceramic silica gel fire guard is good, and nonhygroscopic, and comparatively mica tape intensity is high, and therefore production efficiency is high, and percent defective is low.Simultaneously fire guard thickness can be 0.2-0.8mm not etc., neither affecting fire guard intensity can improve again fire resistance; Inside and outside barrier layer ceramic silica gel fire guard, when 550 degree ~ 1200 degree high temperature, is sintered into rapidly hard shell, thus completely cuts off flame and play a protective role to circuit, unimpeded in high temperature of fire situation of guarantee circuit.Therefore mica tape can be replaced completely as the fireprotection layer of fire-resisting cable.When cable uses as 0.6/1kv, insulating barrier can be done once simultaneously; Inside and outside barrier layer, every layer adopts two-way wrapped mode, improves fire resistance property.

Three, metallized polyester band and glass fiber tape serve the effect of waterproof oxygen barrier, and two-way wrapped mode makes structure tightr.Glass fiber tape improves the intensity of cable simultaneously.

Four, packed layer is closed by glass cord and ceramic silica gel strip mechanical winding and works out, raise its robustness with temperature to improve, have under the relative room temperature of volume and slightly increase, there is heat not collapsing property, make whole cable at high temperature holding structure integrality, thus improve infiltration and mechanical resistant pressure capability.

Five, the important fire resistive construction such as inner barrier layer of the present invention, outer barrier layer and watertight composition, only need apply traditional stranding lapping equipment and just can process, and coordinates the fire proofing material of high strength, make easy to process, cost is low, efficiency is high.

Accompanying drawing explanation

Fig. 1 is the cross-sectional view of the embodiment of the present invention 1;

Fig. 2 is the cross-sectional view of the embodiment of the present invention 2;

Fig. 3 is the structural representation of the embodiment of the present invention 2;

Wherein, 1, conductor; 2, inner barrier layer; 3, insulating barrier; 4, packed layer; 5, watertight composition; 6, outer barrier layer; 7, armour is worked out; 8, restrictive coating.

Embodiment

Be described principle of the present invention and feature below in conjunction with accompanying drawing, example, only for explaining the present invention, is not intended to limit scope of the present invention.

Embodiment 1

As shown in Figure 1, a kind of flexible fire-proof cable, comprise cable core, packed layer 4, watertight composition 5, outer obstruct 6 layers, restrictive coating 8, described cable core comprises conductor 1, inner barrier layer 2 and insulating barrier 3 from inside to outside, at least one cable core is enclosed with in described watertight composition 5, be provided with packed layer 4 between watertight composition 5 and cable core, described watertight composition 5 is outer is enclosed with outer barrier layer 6, restrictive coating 8 successively.

Described conductor 1 is single or many twisted copper conductors, and the lay ratio of described twisted copper conductors is not less than 35.Twisted copper conductors adopts large lay ratio structure, and can effectively prevent in case of fire, conductor high-temperature expansion squeezes bad inner barrier layer 2.

Described inner barrier layer 2 comprises ceramic silica gel fire resistant belt, and be bonded by one deck pottery silica gel and layer of glass, thickness is 0.2-0.5mm, and adjacent layer adopts two-way wrapped mode, every ply place apart windings.This material-70 ~ 210 degree time softness, flexible, intensity is high, mechanicalness insulating properties is excellent.Make cable have the features such as softness, sound insulation, shock resistance, construction is laid convenient.

Described insulating barrier 3 is low-smoke non-halogen flame-retardant cross-linked polyethylene layer.

Described packed layer 4 is closed by glass cord and ceramic silica gel strip mechanical winding and works out.Soft under this material normal temperature, shock-absorbing shock resistance, crust thermal insulation is good; More than 550 degree of temperature, form stiff shell, do not come off after sintering, weightlessness is less than 28%, and the ceramic body of formation does not shrink.

Described watertight composition 5 comprises the glass fiber tape of radial inner one deck and the metallized polyester band of the outer one deck of radial direction, and every ply rate is greater than 30%, the two-way wrapped mode of its two-layer employing, every ply place apart windings.

Described outer barrier layer 6 is ceramic silica gel fire resistant belt, and thickness is 0.6-0.8mm, and adjacent layer adopts two-way wrapped mode, every ply place apart windings.

Described restrictive coating 8 is low-smoke non-halogen flame-retardant crosslinked polyethylene.

Embodiment 2

On the basis of embodiment 1, be provided with establishment armour 7 between barrier layer 6 and restrictive coating 8 outside, described braiding armour 7 is many metal knitted silks, and described metal knitted silk is copper wire or tin plated wire, diameter 0.15-0.2mm, and establishment density is not less than 80%.

The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims

1. A flexible fireproof cable, comprising a cable core, a filling layer, a waterproof layer, an outer barrier layer, and a sheath layer, and the cable core includes a conductor, an inner barrier layer and an insulating layer from the inside to the outside, and the inside of the waterproof layer At least one cable core is wrapped, and a filling layer is arranged between the waterproof layer and the cable core. The waterproof layer is wrapped with an outer barrier layer and a sheath layer in turn.

2. A flexible fireproof cable according to claim 1, characterized in that: the conductor is a single or multiple stranded copper conductors, and the pitch-to-diameter ratio of the stranded copper conductors is not less than 35.

3. A flexible fireproof cable according to claim 1, characterized in that: the inner barrier layer comprises ceramic silica gel refractory tape, which is bonded by a layer of ceramic silica gel and a layer of glass fiber, with a thickness of 0.2- 0.5mm, two-way wrapping is adopted for adjacent layers, and the overlapping parts of each layer are wound at intervals.

4. A flexible fireproof cable according to claim 1, characterized in that the insulating layer is a low-smoke, halogen-free, flame-retardant cross-linked polyethylene layer.

5. A flexible fireproof cable according to claim 1, characterized in that: the filling layer is made of mechanical winding of glass fiber ropes and ceramic silicone strips.

6. A flexible fireproof cable according to claim 1, characterized in that: the waterproof layer comprises a radially inner layer of glass fiber tape and a radially outer layer of metallized polyester tape, each layer The overlapping rate is greater than 30%, and the two layers are wrapped in two directions, and the overlapping parts of each layer are wound at intervals.

7. A flexible fireproof cable according to claim 1, characterized in that: the outer barrier layer is a ceramic silica gel refractory tape with a thickness of 0.6-0.8mm, and two-way wrapping is adopted for adjacent layers, and each layer The overlap is wound at intervals.

8. A flexible fireproof cable according to claim 1, wherein the sheath is low-smoke, halogen-free, flame-retardant cross-linked polyethylene.

9. A kind of flexible fireproof cable according to claim 1, characterized in that: a braided armor layer is arranged between the outer barrier layer and the sheath layer, the braided armor layer is a plurality of metal braided wires, the Metal braided wires are steel wires, copper wires or tinned wires with a diameter of 0.15-0.2 mm and a weaving density of not less than 80%.