Yarn-binding-free layer-stranded optical cable
With its unbundled stranded optical cable design, the cable core is directly bound by the outer sheath, and the interior is filled with non-yarn water-blocking elements, which solves the problem of the large diameter of traditional optical cables and realizes optical cables with smaller diameter and lower cost, suitable for communication needs of high-density and ultra-fine cabling.
Patent Information
- Application Number
- CN202422805438.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-18
- Publication Date
- 2025-12-26
- Estimated Expiration
- 2034-11-18
AI Technical Summary
Traditional optical cables face challenges in terms of transmission capacity and space occupation, making it difficult to meet the needs of high-density cabling and ultra-thin optical cable design, especially due to the constraints of the binding layer and film layer, which result in a relatively thick optical cable diameter.
The cable adopts a non-yarn-bound stranded optical cable design. The cable core is stranded with a central reinforcing member and a loose tube. The outer sheath directly binds the cable core and is filled with non-yarn water-blocking elements. The traditional yarn-bound layer is eliminated. Non-yarn water-blocking powder or grease is used, and the outer sheath material is polyethylene, etc., to achieve direct binding of the cable core and diversified water blocking.
It improves the roundness of optical cables, reduces the diameter and cost of optical cables, and is suitable for high-density cabling and ultra-thin optical cable design. It solves the problem of reducing the diameter of traditional optical cables and saves on film layer materials and labor costs.
Smart Images
Figure CN223728031U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the technical field of optical communication transmission, and more particularly relates to a no-skein layer stranded optical cable. BACKGROUND
[0002] With the surge of global data traffic and the diversification of Internet applications, traditional optical cables face challenges in transmission capacity and space occupation. At present, traditional optical cables mostly use water-blocking yarns to bind the cable cores of stranded cables, or use a thin film extrusion process to extrude a thin layer of thermoplastic elastomer (i.e., a film layer) instead of a skein during SZ stranding. However, under these processes, the diameter of the optical cable is constrained by the skein layer and the film layer, making it particularly difficult to reduce the diameter of the optical cable, which makes the optical cable generally thick and difficult to meet the increasingly stringent communication requirements of current high-density wiring and ultra-thin optical cable design. CONTENT OF THE UTILITY MODEL
[0003] The purpose of the present application is to provide a no-skein layer stranded optical cable that overcomes or alleviates the above-mentioned defects. This type of optical cable can have a very small diameter.
[0004] The present application provides a no-skein layer stranded optical cable, which specifically comprises:
[0005] a cable core, the cable core comprising a central strength member and a plurality of loose tubes, the loose tubes being provided with a plurality of optical fibers, and the loose tubes being stranded on the surface of the central strength member;
[0006] an outer sheath, the outer sheath being wrapped and fitted on the outside of the cable core, so that the cable core is directly bound by the outer sheath;
[0007] Meanwhile, the central strength member and the loose tubes are filled with non-yarn water-blocking elements.
[0008] Compared with the prior art, in the present application, the cable core in the optical cable is directly bound by the outer sheath, the overall roundness of the optical cable is higher than that of the skein type optical cable, the internal water-blocking elements can be selected in a variety of ways, the diameter of the optical cable can be made smaller than that of the skein type optical cable and the film layer bound optical cable, and the cost of the optical cable can be made lower. This makes the present application particularly suitable for meeting the increasingly stringent communication requirements of current high-density wiring and ultra-thin optical cable design.
[0009] As a further preferred embodiment, the cable core further comprises a plurality of filler ropes, and the loose tubes and the filler ropes are jointly stranded on the surface of the central strength member.
[0010] The non-yarn water-blocking elements are filled between the central strength member, the loose tubes, and the filler ropes.
[0011] As a further preferred, the non-yarn water-blocking element is water-blocking powder or water-blocking ointment.
[0012] As a further preferred, the cable core and the outer sheath are filled with non-tape water-blocking elements.
[0013] As a further preferred, the material of the non-tape water-blocking element is the same as that of the non-yarn water-blocking element.
[0014] As a further preferred, the non-tape water-blocking element and the non-yarn water-blocking element are both water-blocking powder.
[0015] As a further preferred, the non-tape water-blocking element is water-blocking powder, water-blocking ointment or water-blocking yarn.
[0016] As a further preferred, the cable core and the outer sheath are provided with a cable opening rope, or are provided with water-blocking yarns extending in the axial direction and capable of opening the cable.
[0017] As a further preferred, the outer sheath has at least one easy-to-rip part extending in the axial direction of the outer sheath.
[0018] As a further preferred, the diameter of the loose tube is less than 1.5 mm, and the wall thickness is less than 0.3 mm.
[0019] As a further preferred, the material of the central reinforcing member includes a single metal or fiber reinforced composite material FRP; and / or,
[0020] The material of the outer sheath includes at least one of polyethylene PE, polyvinyl chloride PVC, polyurethane TPU, nylon PA and flame-retardant polyolefin low-smoke halogen-free LZSH; and / or,
[0021] The material of the loose tube includes at least one of polybutylene terephthalate PBT, polycarbonate PC, polypropylene PP, polyethylene terephthalate PET and thermoplastic polyester elastomer TPEE; and / or,
[0022] The loose tube is a dry or ointment-filled loose tube.
[0023] Overall, compared with the prior art, the above technical solutions conceived by the present application mainly have the following technical advantages:
[0024] 1. The cable core in the optical cable is directly bound by the outer sheath. Compared with the yarn-bound optical cable, the overall roundness of the optical cable is higher, the internal water-blocking element can be selected in various ways, and compared with the yarn-bound optical cable and the thin film layer bound optical cable, the diameter of the optical cable can be made smaller, and the cost of the optical cable can be made lower, which makes the optical cable particularly suitable for meeting the increasingly stringent communication requirements of current high-density wiring and ultra-thin optical cable design. BRIEF DESCRIPTION OF DRAWINGS
[0025] Figure 1 is a radial cross-sectional structure diagram of a yarn-free layer stranded optical cable provided by an embodiment of the present application, in which the internal non-yarn water-blocking element and the non-belt water-blocking element are of the same material.
[0026] Figure 2 is a radial cross-sectional structure diagram of a yarn-free layer stranded optical cable provided by an embodiment of the present application, in which the internal non-yarn water-blocking element and the non-belt water-blocking element are of different materials.
[0027] In all the drawings, the same reference signs are used to represent the same elements or structures, in which:
[0028] 1, outer sheath; 1-1, easy-to-tear part; 2, central strength member; 3, loose tube; 4, non-yarn water-blocking element; 5, non-belt water-blocking element; 6, cable opening rope. DETAILED DESCRIPTION
[0029] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.
[0030] The following will be described in combination with the drawings and embodiments Figures 1-2 The present application will be further described in detail.
[0031] An embodiment of the present application discloses a yarn-free layer stranded optical cable. Referring to Figures 1-2 , the yarn-free layer stranded optical cable includes a cable core and an outer sheath 1. The cable core includes a central strength member 2 and a plurality of loose tubes 3, the loose tubes 3 are provided with a plurality of optical fibers, and the loose tubes 3 are stranded on the surface of the central strength member 2; the outer sheath 1 is wrapped and adhered to the outside of the cable core, so that the cable core is directly bound by the outer sheath 1; at the same time, the central strength member 2 and the loose tube 3 are filled with a non-yarn water-blocking element 4.
[0032] Further, the cable core can further comprise filling ropes, the filling ropes and the loose tubes 3 are collectively stranded on the surface of the central strength member 2; and the non-yarn water-blocking elements 4 are filled between the central strength member 2, the loose tubes 3 and the filling ropes. That is, in some embodiments, the cable core comprises one central strength member 2, m loose tubes 3 and n filling ropes, wherein m≥1 and n≥0. The m loose tubes 3 and the n filling ropes are stranded on the surface of the central strength member 2; and the central strength member 2 is filled with the non-yarn water-blocking elements 4 between the m loose tubes 3 and the n filling ropes. In some preferred embodiments, m+n≥3.
[0033] Further, the material of the central strength member 2 comprises but is not limited to a single metal or a fiber reinforced composite material FRP.
[0034] Further, the material of the loose tube 3 comprises but is not limited to at least one of polybutylene terephthalate PBT, polycarbonate PC, polypropylene PP, polyethylene terephthalate PET and thermoplastic polyester elastomer TPEE.
[0035] In addition, the loose tube 3 can be a dry loose tube or a grease-filled loose tube; the loose tube 3 is preferably a micro tube with a diameter of less than 1.5 mm, and the number of cores per tube is preferably between 1-24 cores, and the wall thickness of the loose tube 3 is preferably less than 0.3 mm. In some specific embodiments, the loose tube 3 can be a micro tube with a diameter of less than 1.0 mm.
[0036] Further, the m loose tubes 3 and the n filling ropes are stranded on the surface of the central strength member 2 by SZ stranding.
[0037] Further, the non-yarn water-blocking element 4 can be water-blocking powder or water-blocking grease.
[0038] Further, the cable core is filled with a non-banded water-blocking element 5 between the outer sheath 1. In some embodiments, the non-banded water-blocking element 5 can be at least one of water-blocking powder, water-blocking grease or water-blocking yarn. In some embodiments, the material of the non-banded water-blocking element 5 can be the same as the material of the non-yarn water-blocking element 4, for example, the non-banded water-blocking element 5 and the non-yarn water-blocking element 4 both use water-blocking powder.
[0039] Further, when the non-yarn water-blocking element 4 and / or the non-banded water-blocking element 5 is selected as water-blocking powder, the particle size of the water-blocking powder is preferably between 50um-1000um. The water absorption of the water-blocking powder is not less than 100g1 / g2, wherein g1 represents the weight of water and g2 represents the weight of the water-blocking powder.
[0040] It is understandable that in the entire optical cable, the gap formed between the central reinforcing member 2 in the cable core and the m loose tubes 3 and n filler ropes is the inner filling gap, and the gap formed between the outer surface of the cable core and the loose tubes is the outer filling gap. Among them, the non-yarn water-blocking element 4 will fill the inner filling gap, while the non-ribbon water-blocking element 5 will fill the outer filling gap.
[0041] Furthermore, the outer sheath 1 is a sleeve that is extruded and molded around the cable core, then cooled, shrunk, and shaped to bind the cable core and the water-blocking powder 5. The materials used for the outer sheath 1 include, but are not limited to, at least one of polyethylene (PE), polyvinyl chloride (PVC), polyurethane (TPU), nylon (PA), and flame-retardant polyolefin low-smoke halogen-free (LZSH).
[0042] Furthermore, in some embodiments, the outer sheath 1 may also have at least one tearable portion 1-1, which preferably extends along the axial direction of the outer sheath 1.
[0043] Furthermore, a cable-opening cord 6 may be provided between the outer surface of the cable core and the outer sheath 1, or a water-blocking yarn extending axially for cable opening may be provided. It should be noted that the design of the tear-resistant part 1-1, the cable-opening cord 6, and / or the water-blocking yarn is not mandatory. These designs can be added or removed according to actual usage requirements.
[0044] For ease of understanding, in the case of Figure 1 In a specific embodiment of a stranded optical cable without braiding, the cable core includes a central reinforcing member 2 and six loose tubes 3, wherein the six loose tubes 3 are stranded on the outer surface of the central reinforcing member 2 in an SZ twisted manner. The outer sheath 1 of the optical cable has two tear-prone sections 1-1, which are symmetrically distributed radially. Furthermore, the optical cable is filled with non-ribbon water-blocking elements 5 and non-yarn water-blocking elements 4, both of which are water-blocking powders. Additionally, a cable-opening cord 6 is filled between the outer surface of the cable core and the outer sheath 1.
[0045] In this design, the cable core is directly bound by the outer sheath 1. Compared with the braided optical cable, the overall roundness of this optical cable is higher. Compared with the braided optical cable and the film-layer bound optical cable, the diameter of this optical cable can be smaller and the cost of the optical cable can be lower. This makes this optical cable particularly suitable for meeting the increasingly stringent communication requirements such as high-density cabling and ultra-fine optical cable design.
[0046] And because there is no water-blocking yarn in the cable core, the loose tube 3 will not be squeezed by the water-blocking yarn during the cabling process, all the loose tubes 3 are uniformly distributed around the central strength member 2, and the roundness of the optical cable can still be maintained after the extruded outer sheath 1 is cooled and shrunk, and the shape at the folding point can still be maintained well, and the cost of the water-blocking powder is much lower than that of the water-blocking yarn.
[0047] In addition, compared with the conventional scheme of replacing the binding yarn with a thermoplastic elastomer (i.e., a film layer), the present scheme adopts a cable sheath one-step forming process, saves the cost of the special material of the film layer, and eliminates the process of applying the film layer, thereby reducing the labor cost and improving the manufacturing efficiency.
[0048] In particular, in the field of manufacturing ultra-small diameter optical cables, the present design can replace the conventional binding yarn process, making it possible to cable the thin-walled ultra-miniature tube SZ with a diameter of less than 1.0 mm. This technology not only solves the problem of unstable tension control, attenuation exceeding the standard, or subsequent temperature cycle attenuation exceeding the standard after the ultra-miniature tube is bound with a yarn, but also solves the problem of attenuation exceeding the standard or subsequent temperature cycle exceeding the standard caused by the extrusion and pressure injury of the tube caused by the water-blocking yarn inside the cable core.
[0049] It is to be understood that the terms such as "include" and "may include" used in the present application indicate the presence of the disclosed functions, operations, or constituent elements, and do not exclude one or more additional functions, operations, and constituent elements. In the present application, terms such as "include" and / or "have" can be interpreted to mean that a specific characteristic, number, operation, constituent element, component, or a combination thereof is present, but cannot be interpreted to exclude the presence or addition of one or more other characteristics, numbers, operations, constituent elements, components, or combinations thereof.
[0050] It should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.
[0051] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.
[0052] In this application, unless otherwise clearly indicated and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.
[0053] Those skilled in the art can easily understand that the above description is only a preferred embodiment of the present application, and is not intended to limit the present application, and any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims
1. A stranded optical cable without braiding, characterized in that, include: The cable core includes a central reinforcing member (2) and several loose tubes (3), and several optical fibers are disposed inside the loose tubes (3). The loose tubes (3) are twisted to the surface of the central reinforcing member (2). Outer sheath (1), the outer sheath (1) covers and fits the outside of the cable core, so that the cable core is directly bound by the outer sheath (1); Meanwhile, a non-yarn-type water-blocking element (4) is filled between the central reinforcing member (2) and the loose sleeve (3); The non-yarn-type water-blocking element (4) is water-blocking powder or water-blocking grease; The space between the cable core and the outer sheath (1) is filled with a non-strip water-blocking element (5).
2. The unbundled stranded optical cable as described in claim 1, characterized in that, The cable core also includes several filler ropes, and the loose tube (3) and the filler ropes are twisted together on the surface of the central reinforcing member (2); The non-yarn-type water-blocking element (4) is filled between the central reinforcing member (2), the loose sleeve (3), and the filling rope.
3. The unbundled stranded optical cable as described in claim 1, characterized in that, The material of the non-strip water-blocking element (5) is the same as that of the non-yarn water-blocking element (4).
4. The unbundled stranded optical cable as described in claim 1, characterized in that, The non-strip water-blocking element (5) is water-blocking powder, water-blocking grease, or water-blocking yarn.
5. The unbundled stranded optical cable as described in claim 1 or 2, characterized in that, A cable-opening rope (6) is provided between the cable core and the outer sheath (1), or a water-blocking yarn that extends axially and can be used for cable opening is provided.
6. The unbundled stranded optical cable as described in claim 1 or 2, characterized in that, The outer sheath (1) has at least one tearable portion (1-1) that extends along the axial direction of the outer sheath (1).
7. The unbundled stranded optical cable as described in claim 1 or 2, characterized in that, The diameter of the loose sleeve (3) is less than 1.5 mm and the wall thickness is less than 0.3 mm.