CN213398996U - Full-dry type flame-retardant optical cable - Google Patents
Full-dry type flame-retardant optical cable Download PDFInfo
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- CN213398996U CN213398996U CN202022646857.4U CN202022646857U CN213398996U CN 213398996 U CN213398996 U CN 213398996U CN 202022646857 U CN202022646857 U CN 202022646857U CN 213398996 U CN213398996 U CN 213398996U
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Abstract
The utility model relates to a fire-retardant optical cable of full dry-type, it includes cable core, inner sheath layer, first fire-retardant layer and outer sheath layer, wherein, the cable core is including the fire-retardant layer of central reinforcement, optical fiber unit, filling rope and second. The central reinforcing member and the second flame-retardant layer are sleeved to form an annular cavity. The quantity of optic fibre unit and filling rope all sets up to a plurality ofly, and all places in the annular cavity in. For a single optical fiber unit, the optical fiber unit comprises an optical fiber, a first water-blocking powder filling body and a loose tube. The first water-blocking powder filling body is arranged in the loose tube and fully surrounds the optical fiber. Through adopting above-mentioned technical scheme to set up to make optic fibre have great free space in loose sleeve pipe, make the process of penetrating of optic fibre not disturbed basically, and then ensured that the optical cable after the shaping has better optical property and mechanical properties.
Description
Technical Field
The utility model relates to a communication optical cable makes technical field, especially relates to a fire-retardant optical cable of full dry-type.
Background
As the demand for information continues to increase, optical fiber communication is widely used as a communication mode with the fastest signal transmission speed and the best transmission quality. However, optical cables are increasingly used today in the high-speed development of network construction.
As shown in fig. 1, the conventional all-dry type flame-retardant optical cable is formed substantially as follows: 1) adding water-blocking yarn into the loose sleeve; 2) stranding the formed loose tube and the filling rope on the central reinforcing member; 3) forming a stable cable core structure after longitudinally wrapping the water blocking tape; 4) and extruding the flame-retardant sheath material outside the cable core, or performing secondary sheath to use the high-flame-retardant sheath material. Although the full-dry flame-retardant optical cable formed by the method has the advantages of light weight, good flame-retardant effect and the like, the following problems are also existed: the water-blocking yarn is made of a softer material relative to the optical fiber, and has lower modulus and strength, and can generate a larger excess length difference relative to the optical fiber in the manufacturing process, so that the disturbance to the optical fiber is easily caused, the additional attenuation of the optical fiber is further increased, and the tensile rate and the high and low temperature performance of the optical cable are influenced under severe conditions; in addition, the water-blocking yarn also occupies a larger space in the loose tube, so that the free space of the optical fiber in the loose tube is severely limited, and the penetration of the optical fiber is not facilitated. Thus, a skilled person is urgently needed to solve the above problems.
SUMMERY OF THE UTILITY MODEL
Therefore, in view of the above-mentioned problems and drawbacks, the present invention provides a flame-retardant optical cable, which is designed to collect relevant information, and finally results in the appearance of the fully-dry type flame-retardant optical cable through many evaluations and considerations and through continuous experiments and modifications of the technicians engaged in the industry for years of research and development experience.
In order to solve the technical problem, the utility model relates to an include by interior and outer according to the preface concentric registrate cable core, inner sheath layer, first fire-retardant layer and oversheath layer, wherein, the cable core is including central reinforcement, optical fiber unit, filling rope and the fire-retardant layer of second. The central reinforcing member and the second flame-retardant layer are sleeved to form an annular cavity. The quantity of optic fibre unit and filling rope all sets up to a plurality ofly, and all places in the annular cavity in. For a single optical fiber unit, the optical fiber unit comprises an optical fiber, a first water-blocking powder filling body and a loose tube. The optical fiber is arranged in the loose tube in a penetrating way. The first water-blocking powder filling body is arranged in the loose tube and fully surrounds the optical fiber.
As the further improvement of the technical proposal of the utility model, the cable core also comprises a second water-blocking powder filling body. The second water-blocking powder filling body is arranged in the second flame-retardant layer and fully surrounds the optical fiber unit, the central reinforcing piece and the filling rope.
As the utility model discloses technical scheme's further improvement, the preferred layer of stranded structure of cable core, optical fiber unit and filling rope all strand around central reinforcement.
As a further improvement of the technical scheme of the utility model, the cable core is further including the low smoke and zero halogen restrictive coating of registrate on central reinforcement.
As the technical scheme of the utility model is further improved, the preferred FRP reinforcement that is of center reinforcement.
As a further improvement of the technical scheme of the utility model, the first fire-retardant layer and the fire-retardant layer of second are formed by fire-retardant glass fiber tape circumference winding.
As a further improvement of the technical proposal of the utility model, the inner sheath layer is preferably formed by ceramic low-smoke halogen-free polyolefin extrusion molding; and the outer sheath layer is preferably extruded from a low smoke halogen-free flame retardant material.
The utility model discloses an among the fire-retardant optical cable of full-dry type, pack the powder of hindering water in its loose tube intussuseption in order to ensure its fire behaviour. Compared with the traditional water-blocking yarn filling process, the water-blocking powder filling process has the advantages that the optical fiber has larger free space in the loose tube, the inner diameter size of the loose tube can be effectively reduced on the premise of the same accommodating space, the penetration process of the optical fiber is basically not interfered, and the optical cable is ensured to have better optical performance and mechanical performance.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of the middle full-dry flame-retardant optical cable of the present invention.
Figure 2 is the structure schematic diagram of the cable core in the full-dry type flame retardant optical cable of the utility model.
Fig. 3 is a schematic structural diagram of an optical fiber unit in the full-dry type flame-retardant optical cable of the present invention.
Fig. 4 is a schematic structural diagram of the first water-blocking powder filling device in the forming method of the full-dry type flame-retardant optical cable of the present invention.
Fig. 5 is a schematic structural diagram of a second water-blocking powder filling device in the forming method of the full-dry type flame-retardant optical cable of the present invention.
1-a full dry flame retardant optical cable; 11-a cable core; 111-central reinforcement; 112-an optical fiber unit; 1121-optical fiber; 1122-first water-blocking powder filler; 1123-loose cannula; 113-a filler rope; 114-a second flame retardant layer; 115-second water-blocking powder filling body; 12-inner jacket layer; 13-a first flame retardant layer; 14-an outer jacket layer; 2-a first water-blocking powder filling device; 21-a first bin; 22-a first powder pushing unit; 23-a first delivery conduit; 3-a second water-blocking powder filling device; 31-a second bin; 32-a second delivery pipe; 33-blanking control module.
Detailed Description
The contents of the present invention will be further described in detail with reference to the specific embodiments, and fig. 1 shows a schematic structural diagram of a middle-dry type flame-retardant optical cable of the present invention, which is mainly composed of a cable core 11, an inner sheath layer 12, a first flame-retardant layer 13, and an outer sheath layer 14, which are concentrically sleeved from inside to outside according to a certain sequence, wherein, as shown in fig. 2, the cable core 11 includes a central reinforcement 111, an optical fiber unit 112, a filling rope 113, and a second flame-retardant layer 114. The central reinforcing member 111 and the second flame retardant layer 114 are fitted to form an annular cavity. The optical fiber units 112 and the filling ropes 113 are provided in plural numbers, and are all arranged in the annular cavity.
As shown in fig. 3, for the single optical fiber unit 112, it includes an optical fiber 1121 and a loose tube 1123. The optical fiber 1121 is inserted into the loose tube 1123. It is known that the optical fiber 1121 is extremely sensitive to HO-generated by water and moisture, which accelerate crack growth at the surface of the optical fiber 1121, resulting in a significant drop in the tensile strength and bending strength of the optical fiber 1121. In addition, hydrogen generated by chemical reaction between moisture and metal materials may cause hydrogen loss of the optical fiber 1121, resulting in an increase in transmission loss of the optical fiber 1121, which seriously affects the quality and service life of the transmission signal of the optical fiber 1121. In view of this, the present invention optimizes the water-blocking performance of the optical fiber unit, and a first water-blocking component filler 1122 is further added to the optical fiber unit 112 as required. The first water blocking powder filler 1122 is placed in the loose tube 1123 and fully surrounds the optical fiber 1121. By adopting the above technical scheme, on one hand, compared with the conventional water-blocking yarn filling process and the like, the filling of the first water-blocking component filling body 1122 in the loose tube 1123 enables the optical fiber 1121 to have sufficient free space in the loose tube 1123, so that the penetration process of the optical fiber 1121 is basically not interfered, and the optical cable is ensured to have better optical performance and mechanical performance; on the other hand, the inner diameter of the loose tube 1123 can be effectively reduced on the premise of the same accommodating space, so that the overall outer diameter of the full-dry flame-retardant optical cable is reduced to a certain extent; on the other hand, the additional attenuation rate of the optical fiber 1121 is reduced as much as possible, and the optical cable after molding is ensured to have good tensile rate and high and low temperature performance.
In order to further improve the fire resistance of the cable core and further improve the overall fire resistance of the full-dry flame-retardant optical cable, as a further optimization of the structure of the full-dry flame-retardant optical cable, a second water-blocking powder filler 115 (as shown in fig. 2) may be filled in the second flame-retardant layer 114. After the molding is completed, the second water blocking powder filling body 115 completely surrounds the optical fiber unit 112, the central reinforcing member 111, and the filling string 113.
Furthermore, in the actual manufacturing process, the cable core 11 is preferably of a layer-twisted structure, i.e. the optical fiber units 112 and the filling ropes 113 are twisted around the central reinforcing member 111, so that the structural stability and the tensile strength of the cable core 11 after molding are effectively improved.
FRP materials are known to have the following properties: 1) the relative density of FRP is between 1.5-2.0, only 1/4-1/5 of carbon steel, however, the tensile strength of the FRP is close to or even exceeds that of carbon steel, and the specific strength can be compared with that of high-grade alloy steel. The tensile strength, the bending strength and the compressive strength of some epoxy FRP can reach more than 400 MPa; 2) the FRP also has excellent corrosion resistance and has better resistance to atmosphere, water, acid, alkali, salt with common concentration and various oils and solvents; 3) FRP is also an excellent insulating material, and can still protect good dielectricity at high frequency. In view of this, the center reinforcement 111 is preferably an FRP reinforcement.
In addition, the central reinforcement 111 may be further optimized, and a low smoke and zero halogen sheath layer may be further sleeved on the central reinforcement according to actual conditions. Even if the full-dry flame-retardant optical cable is burnt, the generation of combustion waste gas can be effectively reduced due to the low-smoke halogen-free sheath layer.
Further, the first flame retardant layer 13 and the second flame retardant layer 114 are preferably formed by winding a flame retardant glass fiber tape in the circumferential direction. And the inner jacket layer 12 is preferably extruded from a ceramic low smoke halogen-free polyolefin and the outer jacket layer 14 is preferably extruded from a low smoke halogen-free flame retardant material. Therefore, the full-dry flame-retardant optical cable has stronger flame-retardant performance, such as burning resistance, nucleation performance, smoke suppression performance and anti-dripping performance; meanwhile, the quantity of combustible materials such as fiber paste or cable paste is remarkably reduced, so that the heat release quantity of the optical cable in the combustion process is greatly reduced, and the optical cable can meet the requirements of European test standards for testing CPRCca, s1a, combustion droppings d0 and combustion gas acidity a1 of cables in permanent buildings.
Additionally, the utility model also discloses a forming method of full dry-type fire-retardant optical cable, its shaping step is comparatively succinct, and shaping efficiency is higher, and final shaping quality is higher. The forming method of the full-dry type flame-retardant optical cable comprises the following steps:
a. molding of the optical fiber unit 112: forming a loose tube 1123 on the periphery of the optical fiber 1121, and then filling dry water-blocking powder into the inner cavity of the loose tube 1123 to form a first water-blocking powder filling body 1122;
c. and (3) forming of the cable core 11: a plurality of optical fiber units 112 and a plurality of filling cords 113 are stranded around the periphery of the central strength member 111, and then a flame retardant tape is wound around the peripheries of the optical fiber units 112 and the filling cords 113 to form a second flame retardant layer 114;
d. filling dry water-blocking powder into the inner cavity of the second flame-retardant layer 114 to form a second water-blocking powder filling body 115;
e. an inner sheath layer 12 is formed on the periphery of the cable core 11;
f. winding a flame retardant tape around the outer periphery of the inner sheath layer 12 to form a first flame retardant layer 13;
g. an outer sheath layer 14 is formed on the periphery of the first flame retardant layer 13.
In the above step a, it is preferable to fill the dry type waterproof powder into the loose tube 1123 by means of the first waterproof powder filling apparatus 2, in view of ensuring high molding efficiency and uniformity of molding of the first waterproof powder filling body 1122, as follows: as shown in fig. 4, the first waterproof powder filling device 2 comprises a first bin 21, a first powder pushing unit 22 and a first material conveying pipe 23; a first feeding port is arranged on the first material box 21 for placing dry-type water-blocking powder; the first material conveying pipe 23 is connected between the first material box 21 and the loose tube 1123; the first powder pushing unit 22 is installed on a side wall of the first hopper 21, and when it is operated, it feeds dry type waterproof powder into the loose tube 1123 through the first feed conveyor 23 by means of compressed gas to mold the first waterproof powder filling body 1122.
It should be noted that the compressed gas emitted from the first powder pushing unit 22 for pushing the dry type waterproof powder is preferably an inert gas (e.g., nitrogen gas), so as to avoid the occurrence of denaturation phenomenon due to contact with the outside air.
In addition, in step c, in comparison with the first waterproof powder filling device 2, in order to ensure that the second waterproof powder filling body 115 has higher molding efficiency and molding uniformity, it is preferable to fill the dry waterproof powder into the second flame retardant layer 114 by means of the second waterproof powder filling device 3, specifically as follows: as shown in fig. 5, the second waterproof powder filling apparatus 3 includes a second hopper 31 and a second feed conveyor 32. The second bin 31 is provided with a second feeding port for placing the dry-type water-blocking powder. The second feed conveyor 32 is connected directly below the second hopper 31 and has its outlet corresponding to the second flame retardant layer 114. The dry type water-blocking powder is applied to the periphery of the second flame retardant layer 114 through the second feed conveyor pipe 32 by means of gravity.
Finally, in order to better control the accuracy of the amount of the dry type waterproof powder falling to the second flame retardant layer 114 and ensure the uniformity of the molding of the first flame retardant layer 13, as shown in fig. 5, a blanking control module 33 is additionally provided in the second waterproof powder filling device 3 according to actual conditions. The blanking control module is detachably connected between the second hopper 31 and the second conveying pipe 32.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. A full-dry flame-retardant optical cable is characterized by comprising a cable core, an inner sheath layer, a first flame-retardant layer and an outer sheath layer which are concentrically sheathed from inside to outside in sequence; the cable core comprises a central reinforcing piece, an optical fiber unit, a filling rope and a second flame-retardant layer; the central reinforcing piece and the second flame-retardant layer are sleeved to form an annular cavity; the number of the optical fiber units and the number of the filling ropes are multiple, and the optical fiber units and the filling ropes are all arranged in the annular cavity; aiming at a single optical fiber unit, the optical fiber unit comprises an optical fiber, a first water-blocking powder filling body and a loose tube; the optical fiber penetrates through the loose tube; the first water-blocking powder filling body is arranged in the loose tube and completely surrounds the optical fiber.
2. The all-dry flame-retardant optical cable according to claim 1, wherein the cable core further comprises a second water-blocking powder filler; the second water-blocking powder filling body is arranged in the second flame-retardant layer and fully surrounds the optical fiber unit, the central reinforcing piece and the filling rope.
3. An all-dry flame-retardant optical cable according to any one of claims 1 to 2, wherein the cable core has a layer-stranding structure, and the optical fiber units and the filler cords are stranded around the central strength member.
4. The all-dry flame retardant optical cable according to claim 3, wherein the cable core further comprises a low smoke zero halogen sheath layer sleeved on the central reinforcing member.
5. The all-dry flame retardant optical cable according to claim 4, wherein the central strength member is an FRP strength member.
6. The all-dry flame-retardant optical cable according to claim 3, wherein the first flame-retardant layer and the second flame-retardant layer are both formed by circumferentially winding a flame-retardant glass fiber tape.
7. The all-dry flame retardant optical cable according to claim 3, wherein the inner sheath layer is extruded from a ceramic low smoke zero halogen polyolefin; and the outer sheath layer is formed by extrusion molding of low-smoke halogen-free flame-retardant materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022646857.4U CN213398996U (en) | 2020-11-16 | 2020-11-16 | Full-dry type flame-retardant optical cable |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022646857.4U CN213398996U (en) | 2020-11-16 | 2020-11-16 | Full-dry type flame-retardant optical cable |
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| CN213398996U true CN213398996U (en) | 2021-06-08 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022100287A1 (en) * | 2020-11-16 | 2022-05-19 | 江苏亨通光电股份有限公司 | Full-dry flame-retardant optical cable and forming method therefor |
| CN117215015A (en) * | 2023-11-07 | 2023-12-12 | 江苏中天科技股份有限公司 | Underwater optical cable |
-
2020
- 2020-11-16 CN CN202022646857.4U patent/CN213398996U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022100287A1 (en) * | 2020-11-16 | 2022-05-19 | 江苏亨通光电股份有限公司 | Full-dry flame-retardant optical cable and forming method therefor |
| CN117215015A (en) * | 2023-11-07 | 2023-12-12 | 江苏中天科技股份有限公司 | Underwater optical cable |
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