CN201749239U - Layer-stranded type optical cable - Google Patents

Abstract

The utility model relates to a layer-stranded type optical cable, belonging to the technical field of optical fiber cable, which comprises a cable core, a protection layer covering outside the cable core, and a jacket layer that is extruded and covered outside the protection layer, wherein the cable core comprises a central reinforcing piece and more than two loose casings, wherein the central reinforcing piece comprises a steel wire which is coated with grease on the outer wall and has the diameter of 1.0-3.2mm, and a plastic pad layer that is extruded and covered outside the steel wire; the loose casings are stranded with the central reinforcing piece and respectively contain a plurality of optical fibers; and the layer-stranded type optical cable is characterized in that a groove is formed on the outer wall of the steel wire, and the plastic pad layer is embedded into the groove. By adopting the technical scheme, as the groove is formed outside the steel wire of the central reinforcing piece, the layer-stranded type optical cable guarantees the good combination between the plastic pad layer and the steel wire on the premise of not removing the grease coated outside the steel wire, thus avoiding longitudinal water seepage of the cable core.

Description

Layer-stranding cable

Technical field

The utility model belongs to the optical fiber cable technical field, is specifically related to a kind of layer-stranding cable.

Background technology

Along with the development of telecommunications, optical cable is owing to transmission information is widely used in the communications field greatly.The cable configuration that is applied in the communications field roughly has three kinds: the one, and layer-stranding cable; The 2nd, the central beam tube type optical cable; The 3rd, slotted core cable.

Laminated striation formula optical cable is that painted optical fiber and ointment are joined in the loose sleeve pipe of being made by high-modulus plastic simultaneously, optical fiber can move in supporting pipe, different loose sleeve pipes is along the stranded cable core of making of central reinforce member (also claiming the center strengthening core), cable core adds protective materials, obtains the loose sleeve layer strand type optical cable.The principal feature of layer-stranding cable has: loose shell material itself has hydrolysis characteristic and good intensity, fills in the pipe with extraordinary ointment, and optical fiber is protected; Central reinforce member is in the cable core middle position, and loose sleeve pipe around central reinforce member layer strand, by control excess fiber length and adjustment twisting pitch, can make optical cable have good tensile property and temperature characterisitic with suitable twisting pitch; Twist together with the filling of cable cream between pine sleeve pipe and the strengthening core, guaranteed the water resistance between loose sleeve pipe and the central reinforce member.In Chinese patent literature, can be seen in technical scheme in a large number, for example: the disclosed layer-twisted type small cable core of CN2396405Y ADSS optical cable about layer-stranding cable; The half dry type layer that efficiently blocks water that CN2458637Y introduces twists light armour optical cable; The loose sleeve layer strand type optical fiber cable that CN2508257Y discloses; The sheath that CN2624229Y provides is carried indoor and outdoor integration lay-up optical cable and publication number CN101231370A, CN101382629A, CN101458380A, CN101592766A, publication No. CN101697028A and the publication No. CN101706601A of steel wire floor stranded cables, CN2802529Y announcement secretly, or the like, all related to layer-stranding cable.

The central beam tube type optical cable abbreviates the central tubular optical cable usually as, it is that optical fiber is inserted in the spiral space pine sleeve pipe of being made by high-modulus plastic, fill waterproofing compound in the sleeve pipe, sleeve pipe applies one deck material water-proof material and armoring material outward, and both sides are placed two parallel steel wires and extruded pe sheath and constitute.The optical cable of this version can be seen in Chinese patent literature too in a large number, for example: CN2559002Y, CN2168265Y and CN2537988Y or the like.

Slotted core cable also claims the Rosenberg slotted core cable, be suitable for built on stilts and piping erection environment, in Chinese patent literature, still can be seen in a large number, for example CN1617006A, CN2486980Y, CN101359072A, CN201181350Y, CN2876812Y, CN2869902Y and CN2550786Y, or the like.

Layer-stranding cable (to call the former in the following text) has the following part of standing out from one's fellows for central tubular optical cable (hereinafter to be referred as the latter): with regard to structure, the former excess fiber length is than the easier control of the latter's excess fiber length; With regard to water proofing property, the former significantly is better than the latter, because the former is made up of a plurality of different loose sleeve pipes, diameter is less relatively, and the latter's loose casing diameter is thicker, and optical fiber all is encapsulated in the loose sleeve pipe; With regard to mechanical property, the former tensile strength is better than the latter; The former can reach tens of to hundreds of cores, and the latter only is tens cores; With regard to system of laying, the former application scenario is wide, for example built on stilts, direct-burried, pipeline and all can be suitable under water, and the latter has fastidious property; With regard to the convenience of installing, the former installation is more convenient than the latter, because the latter's fibre core is integrated in the same loose sleeve pipe, after cable was opened stripping, all optical fiber all exposed, and were full of ointment, inconvenience is installed, and a plurality of different loose sleeve pipes of the former reason are formed, so can select out the loose sleeve pipe of stripping, are convenient to install and use.

Because in aforesaid three kinds of optical cables, the manufacturing process of layer-stranding cable is the most ripe, and the occasion that is about more than 80% all uses layer-stranding cable, and therefore, layer-stranding cable is regarded highly in the communications field most.

As shown in the above description, because strong points such as a layer strand layer optical cable has Stability Analysis of Structures, the fibre core capacity is big, tensile strength is high and easy for installation and widely being used, the structure of this optical cable are generally: be made of the loose sleeve pipe that includes multifiber or fibre ribbon, gasket for packing, central reinforce member, moisture barrier (the perhaps anti-layer of pressing) and outer jacket.Pine sleeve pipe and gasket for packing one common peripheral coat moisture barrier or anti-pressure layer around the stranded formation cable core of the central reinforce member that is positioned at optical cable center (central authorities) outside cable core, again moisture barrier or anti-the pressure outside the layer with the crowded restrictive coating that covers of extrusion molding mode.The material of aforesaid central reinforce member uses steel wire usually.In order to reach structural rounding property, the size of central reinforce member increases with the increase of the diameter sum of loose sleeve pipe and gasket for packing usually, but for optical cable, the main effect of central reinforce member is the requirement that ensures or claim to satisfy mechanical stretching force, thereby satisfying under the prerequisite of tensile force, usually squeeze outside steel wire and cover plastic layer and use as central reinforce member and use, the strong point of doing like this has three: one, has dwindled gauge of wire, makes in the production coiling easier; The 2nd, make the flexibility of optical cable even more ideal; The 3rd, have economy, promptly reduce manufacturing cost.Yet, Production for Steel Wire manufacturer gets rusty for fear of steel wire, usually outside steel wire, smear one deck grease, and optical cable production firm squeezes when covering plastic layer outside the steel wire of apply grease, in order to ensure the effect that combines between plastic layer and the steel wire, to avoid vertical infiltration, usually use naked light will spread upon the outer grease burn off of steel wire, so obviously there is the problem of attending to one thing and lose sight of another in way, so-called Gu this, that is: can improve to squeeze and overlay on the degree of reliability that the outer plastic layer of steel wire and steel wire mutually combine, steel wire the relative situation of sliding can not occur with plastic layer, and water proofing property is ideal comparatively; So-called mistake that, that is: behind the removal grease, the rust-proof effect of steel wire can be had a strong impact on, and adopt naked light burn off grease both to exist and influence environment, there is hidden danger again,, can causes steel wire to get rusty equally though for example use degreasing agent to remove the hidden danger (initiation fire) that the outer grease of steel wire can avoid using naked light burn off grease with chemical method, and remove grease with degreasing agent and equally environment is produced unfavorable factor, cause the optical cable production craft step to increase in addition and the cost increase.

In sum, at present industry is between two fires to the disposal options as the steel wire of central reinforce member, be applied in the directly crowded plastic layer that covers of the outer grease of steel wire because if keep, so because Steel Wire Surface is extremely lubricious, can't combine closely lastingly between plastic layer and the steel wire, easily electroluminescence cable vertically seeps water, and finally influences the usability of optical cable.In addition, because the environment temperature that optical cable uses objectively is constantly to change, and steel wire is different because of material with the crowded outer plastic layer of steel wire that overlays on, the coefficient of thermal expansion and contraction difference, when variation of ambient temperature is big, usually can cause separating between plastic layer and the steel wire, and then moisture content is infiltrated, destroy the performance of optical cable; Because if remove the grease that is applied in outside the steel wire, the rust inhibition of steel wire disappears so again, and steel wire can get rusty gradually, and the mechanical stretching force of optical cable is had a strong impact on, and even makes product can't reach standard-required.

So, how can guarantee that steel wire has desirable rust-proof effect and can ensure to squeeze to have the excellent effect that combines between the plastic layer that is overlying on steel wire outside and the steel wire and find the problem of best binding site to become the problem that optical cable production firm extremely pays close attention to and urgently the phase is got solution for a long time between the two again, especially, the luminary thinks, in aforesaid two effects effect that combines of steel wire (rust-proof effect of steel wire and the plastics bedding and padding with), can only select one, and can not hold concurrently and it, yet, the applicant has passed through long-term benefiting our pursuits, find a way to resolve the problem, technical scheme described below produces under this background.

Summary of the invention

Task of the present utility model be to provide a kind of both need not to remove be applied in the outer grease of steel wire and use the rust-proof effect of guaranteeing steel wire and can ensure to squeeze to be overlying on to have between the outer plastic layer of steel wire and the steel wire and lasting combine effect and use and avoid the vertically layer-stranding cable of infiltration.

Task of the present utility model is finished like this; a kind of layer-stranding cable; comprise cable core, be coated on the outer protective seam of cable core and squeeze the restrictive coating that overlays on outside the protective seam; described cable core comprises that the diameter that is coated with grease by outer wall is the steel wire of 1.0-3.2mm and squeezes and overlay on central reinforce member and the loose sleeve pipe plural and that central reinforce member is stranded and accommodate multifiber separately that the outer plastic layer of steel wire constitutes; be characterised in that: constitute groove on the outer wall of described steel wire, described plastic layer is embedded in the described groove.

In a specific embodiment of the present utility model, described groove is formed on the steel wire with the interval state, and with the longitudinal center line of steel wire between constitute vertical or and the longitudinal center line of steel wire between constitute the angle of an inclination.

In another specific embodiment of the present utility model, the degree of depth of described groove is 1/10th of a described gauge of wire.

In another specific embodiment of the present utility model, described angle is 25～60 °.

In another specific embodiment of the present utility model, be provided with in the described loose sleeve pipe that accommodates multifiber and be used for the filling agent that blocks water that the spatial domain between optical fiber and the loose sleeve pipe is filled, be filled with water-blocking material in the space between described each loose sleeve pipe.

Also have in the specific embodiment of the present utility model, the described filling agent that blocks water is petroleum jelly or water-proofing powder, and described water-blocking material is cable cream or waterstop.

More of the present utility model and in specific embodiment, described protective seam is aluminium strip, steel band, mylar tape or waterstop.

In of the present utility model and then specific embodiment, described restrictive coating is medium density polyethylene, high density polyethylene, linear low density polyethylene or low-smoke non-halogen flame-retardant tygon.

Of the present utility model again more and in specific embodiment, described optical fiber is rounded optical fiber of shape of cross section or the rectangular or foursquare fibre ribbon of shape of cross section.

In again of the present utility model and then specific embodiment, described cable core also includes gasket for packing, gasket for packing participate in described loose sleeve pipe and described central reinforce member stranded.

Therefore the technical scheme that the utility model provides guarantees plastic layer and steel wire good combination owing to constitute groove outside the steel wire of central reinforce member under need not to remove the prerequisite that is applied in the grease outside the steel wire, avoid cable core vertically infiltration to occur.

Description of drawings

Fig. 1 is the first example structure figure of layer-stranding cable of the present utility model.

Fig. 2 is the second example structure figure of layer-stranding cable of the present utility model.

Fig. 3 is the 3rd example structure figure of layer-stranding cable of the present utility model.

Fig. 4 is the first example structure figure of central reinforce member described in the utility model.

Fig. 5 is the second example structure figure of central reinforce member described in the utility model.

Embodiment

For the auditor that the makes Patent Office especially public can be expressly understood technical spirit of the present utility model and beneficial effect more, the applicant general elaborates in conjunction with the accompanying drawings in the mode of embodiment below, but to the description of embodiment all is not restriction to the utility model scheme, any according to the utility model design done only for pro forma but not substantial equivalent transformation all should be considered as the technical solution of the utility model category.

Embodiment 1:

Ask for an interview Fig. 1 and Fig. 4, the cable core 1 that provides is made of a central reinforce member 11 and five loose sleeve pipes 12, by shown in Figure 1, accommodate six roots of sensation shape of cross section in each loose sleeve pipe 12 and be circular optical fiber 121, and be the filling agent that blocks water that packing material is preferably petroleum jelly in the space between the optical fiber 121 in the space between the inwall of optical fiber 121 and loose sleeve pipe 12.Six roots of sensation optical fiber 121 is coloured to different separately colors by optical fiber coloring machine, and different colors can be installs the facility that identification is provided, and helps to improve installation progress.As technical essential of the present utility model, the surface working fluted 1111 of the steel wire 111 of central reinforce member 11 will be constituted, more properly say, constitute groove 1111 on the surface of steel wire 111 and along the length direction of steel wire 111 with the interval state, when being that the plastic layer 112 of plastics squeezes when being layed onto outside the steel wire 111 with material by the extruded mould of plastic layer extruding machine, motility can not take place by means of groove 1111 and steel wire 111 reliable connection in plastic layer 112.So structure need not to resemble and steel wire 111 outer greases is removed the prior art.Aforesaid five loose sleeve pipes 12 are taken optical fiber 121 separately and are twisted into cable core 1 with the central reinforce member 11 that is made of steel wire 111 and plastic layer 112, stranded mode both can with the mode of two-way sinusoidal SZ also can with the stranded mode of one-way spiral be distributed in central reinforce member 11 around, central reinforce member 11 is positioned at the central authorities of five loose sleeve pipes 12, wherein, fill water-blocking material 123 in the space between each loose sleeve pipe 12, water-blocking material 123 uses cable cream.Wrapped protective seam 2 outside cable core 1, protective seam 2 is an aluminium strip, squeezes outside protective seam 2 and covers restrictive coating 3, the material of restrictive coating 3 is a high density polyethylene.In the present embodiment, the diameter of aforesaid steel wire 111 is 1.1mm, and the degree of depth of groove 1111 is 0.11mm.

Embodiment 2:

Ask for an interview Fig. 2 and Fig. 5, constitute the angle α of inclination between the groove 1111 on the steel wire 111 of the central reinforce member 11 that provides and the longitudinal center line of steel wire 111, the angle of angle α is 45 °, and the diameter of steel wire 111 is 2.8mm, and the degree of depth of groove 1111 is 0.28mm.The filling agent 122 that blocks water is used water-proofing powder instead, and water-blocking material 123 is used waterstop instead, and protective seam 2 is used steel band instead, and the material of restrictive coating 3 is used linear low density polyethylene instead.All the other are all with the description to embodiment 1.

Embodiment 3:

Figure slightly changes the quantity of loose sleeve pipe 12 into three, and the radical of the optical fiber 121 in each loose sleeve pipe 12 changes ten into; change the diameter of steel wire 111 into 2.1mm; the degree of depth of groove 1111 changes 0.21mm into, and protective seam 2 is used mylar tape instead, and the material of restrictive coating 3 is used the low-smoke non-halogen flame-retardant tygon instead.All the other are all with the description to embodiment 1.

Embodiment 4:

Figure slightly.Only the quantity with loose sleeve pipe 12 changes eight into, and the radical of each loose sleeve pipe 12 inner fiber 121 changes three into, and optical fiber 121 is the rectangular fibre ribbon of shape of cross section; The diameter of steel wire 111 changes 3.2mm into, and the degree of depth of groove 1111 changes 0.32mm into, and the angle of the angle α that constitutes between the longitudinal center line of groove 1111 and steel wire 111 changes 60 ° into; Protective seam 2 is used waterstop instead; The material of restrictive coating 3 is used medium density polyethylene instead, and all the other are all with the description to embodiment 1.

Embodiment 5:

Ask for an interview Fig. 3 and Fig. 4, the quantity of pine sleeve pipe 12 has four, and have additional a gasket for packing 13, that is to say that present embodiment is stranded and constitute cable core 1 by four loose sleeve pipes 12 and gasket for packing 13 and central reinforce member 11, the gauge of wire that constitutes central reinforce member 11 changes 2.0mm into, the degree of depth of groove 1111 changes 0.2mm into, and the angle of the angle α that constitutes between the longitudinal center line of groove 1111 and steel wire 111 changes 25 ° into, and all the other are all with the description to embodiment 1.

Embodiment 6:

Figure slightly changes the quantity of loose sleeve pipe 12 into two, and the built-in radical of going into optical fiber 121 of each loose sleeve pipe 12 changes 7 into, the quantity of gasket for packing 13 increases to four, the diameter of steel wire 111 changes 1.6mm into, and the degree of depth of groove 1111 changes 0.16mm into, and all the other are all with the description to embodiment 1.

The material of the loose sleeve pipe 12 described in the foregoing description 1-6 is respectively: polybutylene terephthalate (embodiment 1 and embodiment 5), polypropylene (embodiment 2), polyurethane (embodiment 3 and embodiment 4) and polycarbonate (embodiment 6).

Claims (10)

1. layer-stranding cable; comprise cable core (1); be coated on the outer protective seam (2) of cable core (1) and squeeze and overlay on the outer restrictive coating (3) of protective seam (2); described cable core (1) comprises that the diameter that is coated with grease by outer wall is the steel wire (111) of 1.0-3.2mm and squeezes and overlay on central reinforce member (11) and the loose sleeve pipe (12) plural and that central reinforce member (11) is stranded and accommodate multifiber (121) separately that the outer plastic layer (112) of steel wire (111) constitutes; it is characterized in that: constitute groove (1111) on the outer wall of described steel wire (111), described plastic layer (112) is embedded in the described groove (1111).

2. layer-stranding cable according to claim 1, it is characterized in that described groove (1111) is formed on the steel wire (111) with the interval state, and with the longitudinal center line of steel wire (111) between constitute vertical or and the longitudinal center line of steel wire (111) between constitute the angle (α) of an inclination.

3. layer-stranding cable according to claim 2, the degree of depth that it is characterized in that described groove (1111) be described steel wire (111) diameter 1/10th.

4. layer-stranding cable according to claim 2 is characterized in that described angle (α) is 25～60 °.

5. layer-stranding cable according to claim 1, it is characterized in that being provided with in the described loose sleeve pipe (12) that accommodates multifiber (121) and be used for the filling agent that blocks water (122) that the spatial domain between optical fiber (121) and the loose sleeve pipe (12) is filled, be filled with water-blocking material (123) in the space between described each loose sleeve pipe (12).

6. layer-stranding cable according to claim 1 is characterized in that the described filling agent that blocks water (122) is petroleum jelly or water-proofing powder, and described water-blocking material (123) is cable cream or waterstop.

7. layer-stranding cable according to claim 1 is characterized in that described protective seam (2) is aluminium strip, steel band, mylar tape or waterstop.

8. layer-stranding cable according to claim 1 is characterized in that described restrictive coating is medium density polyethylene, high density polyethylene, linear low density polyethylene or low-smoke non-halogen flame-retardant tygon.

9. layer-stranding cable according to claim 1 or 5 is characterized in that described optical fiber (121) is rounded optical fiber or the rectangular or foursquare fibre ribbon of shape of cross section of shape of cross section.

10. layer-stranding cable according to claim 1 is characterized in that described cable core (1) also includes gasket for packing (13), and it is stranded with described central reinforce member (11) that gasket for packing (13) participates in described loose sleeve pipe (12).

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