CN207181765U - A kind of single mode inside cable - Google Patents

Abstract

The utility model discloses a kind of single mode inside cable, including optical fibre core, tight set, block water stiffener and oversheath, and the tight set is wrapped in optical fibre core outer layer and forms single tight tube fiber, and the tight tube fiber of more than 2 is wrapped in oversheath；The stiffener that blocks water is provided between tight tube fiber in oversheath.It is small that the utility model provides a kind of diameter, in light weight, while reducing cost, has the excellent single mode inside cable to block water with fire resistance.

Description

A kind of single mode inside cable

Technical field

The utility model belongs to communications cable technical field, and in particular to a kind of single mode inside cable.

Background technology

In the optical cable that base station and computer room are used cooperatively, fire-retardant, antiultraviolet function should be met, meet waterproof again Function, existing optical cable, in order to prevent water and moisture from having several ways along longtitudinal dispersion, tradition after entering optical cable：1) in optical cable Inside filling thixotropy ointment, including hydrophobic (hydrophobic) type, water-swellable and expanded by heating type etc. are several.Such material is Oily material, loading is big, and cost is high, easily pollutes environment, it is difficult to clean, need to be by solvent ability particularly in cable connection Cleaning is clean, and the deadweight of optical cable is overweight.

2) PUR water-ring is used between interior oversheath, this method efficiency is low, complex process, only a small number of producer's energy It is enough to realize.

3) using dryness expansion material water-proof material (water swelling powder, waterstop etc.).This method technological requirement is high, material is used Amount is big, cost is high, the deadweight of optical cable is also overweight.In recent years, " dry cable core " structure is introduced into optical cable, and obtains abroad well Using, particularly the deadweight that solves high fiber count cable it is overweight and continue complex procedures the problems such as on have it is incomparable excellent Point.Material water-proof material used in this " dry cable core " optical cable is exactly water blocking yarn.Water blocking yarn water swelling can form gel, obstruction rapidly The space of optical cable aquaporin, so as to reach the purpose to block water.In addition, water blocking yarn is free of oily matter, continue needed for preparing when Between can also shorten dramatically, and wiper, solvent and cleaner need not be prepared；Strengthening for optical cable outer layer is good between yarn and sheath Adhesiveness will not also reduce；In addition the quality of materials is very light so that optical cable deadweight considerably reduces, thus gains great popularity.

Utility model content

Goal of the invention：For the deficiencies in the prior art, the purpose of this utility model is to provide one kind and matched somebody with somebody with base station Cover the fire resistance used and block-water performance is excellent, and the less single mode inside cable of diameter,

Technical scheme：In order to realize foregoing invention purpose, the technical solution adopted in the utility model is：

A kind of single mode inside cable, including optical fibre core, tight set, block water stiffener and oversheath, the tight set parcel Single tight tube fiber is formed in optical fibre core outer layer, the tight tube fiber of more than 2 is wrapped in oversheath；It is tight in oversheath The stiffener that blocks water is provided between unjacketed optical fiber.

Wherein, the tight set is nylon tight set.

Wherein, the tight tube fiber external diameter is 0.9mm.

Wherein, it is described to block water stiffener as the organdy that blocks water.

Wherein, the line density of the organdy that blocks water is 10 strand of 600 Tekes.

Wherein, the oversheath is low smoke halogen-free flame-retardant polyolefin oversheath.

Wherein, when the tight tube fiber is provided with 2, single mode inside cable external diameter is 4.8mm.

Wherein, hard-pressed bale layer being provided between the described stiffener that blocks water, the stiffener that will block water is divided into two layers, and one Layer is between tight tube fiber and hard-pressed bale layer, and another layer is between hard-pressed bale layer and oversheath.

Beneficial effect：Compared with prior art, the utility model has the following advantages：

Cable configuration of the present utility model is simple, and diameter is small, in light weight, both reduces cost, in turn ensure that excellent resistance Water and fire resistance.The utility model uses the organdy that blocks water, and as the stiffener that blocks water, due to blocking water, organdy single is close Degree is stable, and filament strength is high, can not only play resistance effect, and can plays a part of stiffener, need not be further added by optical cable Other stiffeners, reduce the diameter and weight of optical cable.Oversheath uses low smoke halogen-free flame-retardant polyolefin oversheath, has good Good anti-uv-ray and fire resistance, when being that computer room is used cooperatively with base station, optical cable is protected not irradiated shadow by ultraviolet Ring performance.

Brief description of the drawings

Fig. 1 is single mode inside cable cross-sectional structure schematic diagram；

Fig. 2 is the cross-sectional structure schematic diagram that single mode inside cable sets hard-pressed bale layer.

Embodiment

The utility model is described further below in conjunction with the accompanying drawings.

As shown in figure 1, a kind of single mode inside cable, including optical fibre core 1, tight set 2, block water stiffener 3 and oversheath 4, the tight set 2 is wrapped in the outer layer of optical fibre core 1 and forms single tight tube fiber, and the tight tube fiber of more than 2 is wrapped in oversheath 4 It is interior；The stiffener 3 that blocks water is provided between tight tube fiber in oversheath 4.

Optical fibre core 1 is fiber made of quartz glass, is concentric double-layer cylinder, a diameter of 8 μm~10 μm, optical fiber matter Ground is crisp, easy fracture, it is therefore desirable to which additional one layer of tight set forms tight tube fiber as protective layer.Tight tube fiber is provided with two, then 2 core single mode inside cables are formed, two tight tube fibers are arranged to different colours, for example, it is blue and orange, it is easy to the wiring time-division Distinguish；Tight tube fiber is provided with three, then forms 3 core single mode inside cables, and the quantity of tight tube fiber can be increased as needed Subtract.It is nylon that tight set 2, which is coated to layer material, external diameter 0.9mm.

The stiffener 3 that blocks water is the organdy that blocks water.Because the organdy fiber linear density that blocks water is stable, filament strength is high, no It is only capable of playing resistance effect, and can plays a part of stiffener, and other stiffeners that block water need not be further added by optical cable, reduces The diameter and weight of optical cable, the line density for the organdy that blocks water are arranged to 10 strand of 600 Tekes, can play the good effect that blocks water Fruit, and do not increase the diameter of optical cable.Use block water organdy so that optical cable tensile to stretch performance more excellent, in the case where allowing pulling force for a long time, Fibre strain is not more than 0.2%, optical fiber without obvious additional attenuation≤0.03, under of short duration pulling force fibre strain be not more than 0.4%, Should be without obvious remaining additional attenuation≤0.03.

The material of oversheath 4 is low smoke halogen-free flame-retardant polyolefin, and the wall thickness of oversheath is 1.1mm, low-smoke non-halogen flame-retardant polyene Hydrocarbon has good anti-uv-ray and fire resistance, when being that computer room is used cooperatively with base station, protects optical cable not by ultraviolet Line, which irradiates, influences performance, in combustion test, smoke density：Light transmittance is not less than 50%；Corrosivity：Gas caused by optical cable burning PH value be not less than 4.3, electrical conductivity is not more than 10 μ S/mm.

When tight tube fiber is provided with 2, the external diameter of 2 core single mode inside cables of formation is 4.8mm.

Hard-pressed bale layer 5 is provided between the stiffener that blocks water, the stiffener 3 that will block water is divided into two layers, first layer filling Between tight tube fiber and hard-pressed bale layer 5, the second layer is filled between hard-pressed bale layer 5 and oversheath 4.Hard-pressed bale layer 5 is that bullet type is larger Light and thin type spring, first layer is blocked water, and stiffener hard-pressed bale is peripheral in tight tube fiber, and and can plays guarantor to the tight tube fiber of bending Shield acts on, and prevents from producing fracture when tight tube fiber radius bend is larger, strengthens the service life of optical cable.

In summary, optic cable diameter of the present utility model is small, in light weight, both reduces cost, in turn ensure that excellent resistance Water and fire resistance.It is of the present utility model to use the organdy that blocks water as the stiffener that blocks water, due to the organdy single that blocks water Density stabilized, filament strength is high, can not only play resistance effect, and and can plays a part of stiffener, need not increased again in optical cable Add other stiffeners, reduce the diameter and weight of optical cable.Oversheath uses low smoke halogen-free flame-retardant polyolefin, has well Anti-uv-ray and fire resistance, when being that computer room is used cooperatively with base station, protect optical cable not by ultraviolet irradiation influence property Energy.

Described above is only preferred embodiment of the present utility model, it is noted that for the common skill of the art For art personnel, on the premise of the utility model principle is not departed from, some improvements and modifications can also be made, these improve and Retouching also should be regarded as the scope of protection of the utility model.

Claims (5)

1. A kind of 1. single mode inside cable, it is characterised in that：Including optical fibre core (1), tight set (2), the stiffener that blocks water (3) and outer Sheath (4), the tight set (2) are wrapped in optical fibre core (1) outer layer and form single tight tube fiber, the tight tube fiber bag of more than 2 It is rolled in oversheath (4)；The stiffener (3) that blocks water is provided between tight tube fiber in oversheath (4), described block water strengthens structure Part (3) is the organdy that blocks water, and the line density of the organdy that blocks water is 10 strand of 600 Tekes, in the described stiffener that blocks water Between be provided with hard-pressed bale layer (5), the stiffener (3) that will block water is divided into two layers, one layer tight tube fiber and hard-pressed bale layer (5) it Between, another layer is between hard-pressed bale layer (5) and oversheath (4).
2. 2. single mode inside cable according to claim 1, it is characterised in that：The tight set (2) is nylon tight set.
3. 3. single mode inside cable according to claim 1, it is characterised in that：The tight tube fiber external diameter is 0.9mm.
4. 4. single mode inside cable according to claim 1, it is characterised in that：The oversheath (4) is low-smoke non-halogen flame-retardant Polyolefin oversheath.
5. 5. single mode inside cable according to claim 1, it is characterised in that：When the tight tube fiber is provided with 2, single mode Inside cable external diameter is 4.8mm.