Mother-son sleeve type composite optical cable

Abstract

The invention relates to the technical field of composite optical cables, in particular to a primary and secondary sleeve type composite optical cable. The cable unit is positioned on the periphery of the reinforcing piece; the optical cable unit is located on the periphery of the reinforcing piece and abuts against the cable unit; a second filling member which abuts against the cable unit and / or the optical cable unit; the armor layer is arranged on the peripheries of the reinforcing piece, the cable unit, the optical cable unit and the second filling piece in a sleeving manner; and the protection layer is sleeved on the periphery of the armor layer. The composite optical cable provided by the invention can increase the number of optical fibers, avoids overlarge local stress of the optical fibers caused by non-uniform tension, improves the transmission effect of optical signals, and prolongs the service life of the optical signals.

Description

Technical Field

[0001] The present invention relates to the technical field of composite optical cables, and in particular to a mother-and-child sheath type composite optical cable. Background Art

[0002] With the continuous development of emerging technologies such as 5G, the Internet of Things, and smart cities, the demand for communication and power transmission is increasing. Traditional cable transmission cannot meet these requirements. However, optoelectronic composite cables, with their advantages of high speed, large bandwidth, and low attenuation, have become the most efficient transmission method. Optoelectronic composite cables integrate the functions of optical fiber and electrical cable, capable of simultaneously transmitting both optical and electrical signals, making them suitable for a variety of communication and power transmission scenarios. Currently, existing optoelectronic composite cables have the following major technical issues: First, the optical fibers are encased in a single loose tube, limiting the number of fibers they can accommodate. Second, when varying the number of fiber and cable units required, multiple filler cords are required to fill the gaps between the fiber and cable units to maintain a circular cross-section. Furthermore, the number and size of the filler cords must be adjusted according to the number of fiber and cable units, making the operation complex and cumbersome. Twisting the fiber and cable units and multiple filler cords is difficult, and uneven tension can cause excessive stress on the fibers, affecting optical signal transmission and reducing service life. Summary of the Invention

[0003] The present invention provides a mother-and-child sheath type composite optical cable, which is used to solve the problem of how to increase the number of optical fibers, facilitate the adaptation of the number and size of filling ropes, avoid uneven tension causing excessive local stress on the optical fiber, and improve the transmission effect and service life of the optical signal.

[0004] The present invention provides a mother-and-child sheath type composite optical cable, comprising: reinforcements; a cable unit located at the periphery of the reinforcement member; an optical cable unit, located at the periphery of the strength member and abutting against the electrical cable unit; a second filling piece, abutting against the electrical cable unit and / or the optical cable unit; an armor layer, sleeved on the outer circumference of the reinforcement member, the cable unit, the optical cable unit and the second filling member; The protective layer is sleeved on the outer periphery of the armor layer.

[0005] In some embodiments, the optical cable unit includes: optical fiber; a sub-loose tube, which is sleeved on the outer periphery of the optical fiber and filled with fiber paste, and the number is at least one; The mother loose sleeve is sleeved on the outer circumference of the daughter loose sleeve.

[0006] In some embodiments, the cable unit includes: Conductors; The insulating skin is sleeved on the outer periphery of the conductor.

[0007] In some embodiments, the armor layer is a corrugated steel tape.

[0008] In some embodiments, the protective layer is made of medium-density polyethylene or low-smoke halogen-free polyolefin.

[0009] In some embodiments, the number of the electrical cable unit and the number of the optical cable unit are both at least one.

[0010] In some embodiments, the second filling member is an inflatable sleeve, which is sleeved around the outer circumference of the electrical cable unit and the optical cable unit.

[0011] In some embodiments, the inflatable sleeve includes a plurality of triangular inflatable parts connected in sequence, and a sealing membrane is provided at the connection between every two adjacent triangular inflatable parts.

[0012] In some embodiments, further comprising: The first filling piece is located at the outer periphery of the reinforcement piece and abuts against the electrical cable unit and / or the optical cable unit.

[0013] In some embodiments, the first filling member is an inflatable bag, which includes a plurality of circular inflatable parts connected in sequence, and a sealing membrane is provided at the connection between each two adjacent circular inflatable parts.

[0014] The beneficial effects of the present invention are as follows: 1. The mother-and-child sheathed composite optical cable of the present invention provides an efficient, reliable, easy-to-install and maintain transmission line solution that combines the advantages of optical fiber and cable to meet diverse communication and power transmission needs; 2. By providing a mother loose tube and a daughter loose tube, the present invention not only increases the number of optical fibers that can be accommodated, but also provides dual protection for the optical fibers, preventing them from being damaged by twisting forces and mechanical forces such as friction and compression from adjacent cable units and the second filler, which could cause microcracks and breakage, thereby improving the reliability of the optical fibers. 3. The second filler provided by the present invention is designed as an inflatable sleeve, comprising a plurality of triangular inflatable portions connected in sequence, with sealing membranes disposed between adjacent triangular inflatable portions. Firstly, the triangular structure better fits the gap and provides better filling and support. Secondly, the second filler is an integrated structure with good overall stability. When in use, it is directly sleeved around the outer periphery of the twisted cable unit and the optical cable unit, achieving uniform tension and simple and convenient operation. It provides buffering and protection for the optical fiber, improving signal transmission efficiency, extending service life, and facilitating subsequent armoring. Thirdly, the provision of the sealing membrane facilitates the control of the number of triangular inflatable portions to be inflated. According to actual use needs, the appropriate number of triangular inflatable portions can be filled and the inflation can be controlled, achieving simple and convenient operation. 4. The first filling piece provided by the present invention is designed as an inflatable bag, which is a plurality of circular inflatable parts connected in sequence, and a sealing diaphragm is provided between adjacent circular inflatable parts. On the first aspect, the circular inflatable parts can abut against the cable unit and / or the optical cable unit, better fill the adaptation gap, and provide a better filling support effect; on the second aspect, the plurality of circular inflatable parts are an integrated structure with good overall stability. When in use, they are directly twisted together with the cable unit and the optical cable unit, with good tension uniformity, simple and convenient operation, buffering and protecting the optical fiber, improving the signal transmission effect, extending the service life, and facilitating subsequent armoring; on the third aspect, by providing a sealing diaphragm, it is easy to control the inflation amount of the circular inflatable parts. According to actual use needs, an appropriate number of circular inflatable parts can be filled and the inflation can be controlled, which is simple and convenient to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural schematic diagram of a specific embodiment of a mother-and-child sheathed composite optical cable of the present invention; Figure 2 This is a structural schematic diagram of another specific embodiment of a mother-and-child sheathed composite optical cable of the present invention; Figure 3 yes Figure 1 A schematic structural diagram of a specific embodiment of a second filler in a mother-and-child sheath type composite optical cable is shown; Figure 4 yes Figure 1 The figure shows a structural schematic diagram of a specific embodiment of a first filling piece in a mother-and-child sheath type composite optical cable.

[0016] In the accompanying drawings, 1. reinforcement member; 2. cable unit; 21. conductor; 22. insulation skin; 3. optical cable unit; 31. optical fiber; 32. daughter loose sleeve; 33. mother loose sleeve; 4. second filling member; 41. inflatable sleeve; 42. triangular inflatable part; 43. sealing membrane; 44. filling rope; 5. armor layer; 6. protective layer; 7. first filling member; 71. inflatable bag; 72. circular inflatable part. DETAILED DESCRIPTION

[0017] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0018] As described in the background, conventional composite optical cables house only a single loose tube for enclosing optical fibers, limiting the number of fibers they can accommodate. Furthermore, when different numbers of fiber units and cable units are configured, multiple filler cords are required to fill the gaps between the fiber units and the cable units, thereby maintaining a circular cross-section of the composite cable. Furthermore, the number and size of the filler cords must be adjusted based on the number of fiber units and cable units, resulting in a complex and cumbersome operation. Furthermore, twisting the fiber units, cable units, and multiple filler cords is difficult, and uneven tension can cause excessive stress on the fibers, impacting the transmission efficiency of optical signals and reducing their service life. Therefore, increasing the number of optical fibers and facilitating the adaptation of the number and size of the filler cords to avoid excessive stress on the fibers due to uneven tension, thereby improving the transmission efficiency and service life of optical signals, has become a pressing technical issue for those skilled in the art.

[0019] To solve the above problems, refer to Figure 1 、 Figure 2 、 Figure 3 and Figure 4 The present invention provides a mother-and-child sheath composite optical cable, comprising: a strength member 1, a cable unit 2, an optical cable unit 3, a second filler 4, an armor layer 5, and a protective layer 6. The strength member 1 is located at the center of the composite optical cable. The cable unit 2 and the optical cable unit 3 both abut against the outer periphery of the strength member 1 and abut against each other. That is, there is at least one cable unit 2 and at least one optical cable unit 3, and adjacent cable units 2 and / or optical cable units 3 abut against each other. The second filler 4 is located in the gap outside the cable unit 2 and / or optical cable unit 3. The second filler 4 abuts against the cable unit 2 and / or optical cable unit 3, thereby filling the gap outside the cable unit 2 and / or optical cable unit 3. The armor layer 5 is sleeved on the outer periphery of the strength member 1, the cable unit 2, the optical cable unit 3, and the second filler 4. The protective layer 6 is sleeved on the outer periphery of the armor layer 5.

[0020] The mother-and-child sheathed composite optical cable of the present invention provides a transmission line solution that is efficient, reliable, easy to install and maintain, and combines the advantages of optical fibers and cables to meet diverse communication and power transmission requirements.

[0021] Preferably, the reinforcement 1 is phosphated steel wire or FRP, where FRP is fiber reinforced plastic.

[0022] Preferably, the optical cable unit 3 includes: an optical fiber 31, a daughter loose tube 32 and a mother loose tube 33. The daughter loose tube 32 is sleeved on the outer periphery of the optical fiber 31 and is filled with fiber paste. That is, fiber paste is filled between the optical fibers 31. There are multiple daughter loose tubes 32, and the mother loose tube 33 is sleeved on the outer periphery of the multiple daughter loose tubes 32. By providing the mother loose tube 33 and the daughter loose tube 32, on the one hand, the number of optical fibers 31 accommodated is increased; on the other hand, the optical fiber 31 is protected twice, preventing the optical fiber 31 from being damaged by the twisting force and the mechanical forces such as friction and extrusion of the adjacent cable unit 2 and the second filler 4, thereby improving the reliability of the optical fiber 31.

[0023] Preferably, the mother loose tube 33 has a larger diameter and strength, and the material is PBT, i.e. polybutylene terephthalate, with a wall thickness of 0.5-1.2mm. The daughter loose tube 32 has a smaller diameter, and the material is PBT, i.e. polybutylene terephthalate, with a wall thickness of 0.2-0.3mm. Each daughter loose tube 32 is embedded with 4-12 optical fibers 31, and the optical fibers 31 are single-mode optical fibers or multimode optical fibers.

[0024] Preferably, the cable unit 2 comprises: a conductor 21 and an insulating sheath 22 sleeved around the conductor 21. The insulating sheath 22 has different colors and is made of PVC, i.e., polyvinyl chloride, with a thickness of 0.6-1.0 mm.

[0025] Preferably, the outer diameters of the electrical cable unit 2 and the optical cable unit 3 are the same, that is, the outer diameters of the female loose tube 33 and the insulating sheath 22 are the same.

[0026] Preferably, the armor layer 5 is a corrugated steel belt.

[0027] Preferably, the material of the protective layer 6 is medium-density polyethylene or low-smoke halogen-free polyolefin.

[0028] Preferably, the number of each of the electrical cable unit 2 and the optical cable unit 3 is at least one, and the number of the electrical cable unit 2 and the optical cable unit 3 can be adjusted according to actual needs.

[0029] Preferably, the second filling member 4 can be a PP filling rope 44, where PP is polypropylene. The second filling member 4 can also be an inflatable sleeve 41, which is sleeved on the outer circumference of the electrical cable unit 2 and the optical cable unit 3.

[0030] Preferably, the inflatable sleeve 41 includes a plurality of sequentially connected triangular inflatable sections 42, with sealing membranes 43 disposed between adjacent triangular inflatable sections 42. The plurality of sequentially connected triangular inflatable sections 42 are defined as a first inflatable section, a second inflatable section, a third inflatable section, and so on. An inflatable port is disposed at the top or bottom of the first inflatable section.

[0031] During specific implementation, the inflatable sleeve 41 is placed on the outer periphery of the twisted cable unit 2 and the optical cable unit 3, and gas is introduced into the inflation port of the first inflatable part. After the first inflatable part is filled with gas and swells, it becomes a triangle, filling the gap formed by two adjacent cable units 2 or two adjacent optical cable units 3 or the outside of two adjacent cable units 2 and the optical cable unit 3. When the second inflatable part needs to be filled, gas is continued to be introduced into the inflation port of the first inflatable part. When the air pressure in the first inflatable part is greater than the bearing limit of the sealing diaphragm 43, the sealing diaphragm 43 is forced to rupture instantly, and the gas enters the second inflatable part from the first inflatable part through the ruptured sealing diaphragm 43. When the third inflatable part needs to be used, the above-mentioned operation can be repeated.

[0032] It should be noted that when not inflated, the inflatable sleeve 41 is in a deflated state and is flexible and adaptive. That is, when not inflated, each triangular inflatable portion 42 is in a deflated state and is flexible and adaptive, and does not require space. In specific implementation, the triangular inflatable portions 42 can be inflated according to the actual number required, and the unused triangular inflatable portions 42 are not inflated. Since the unused triangular inflatable portions 42 are in a deflated state and do not require space, they only need to be attached between the cable unit 2 and the armor layer 5, or between the optical cable unit 3 and the armor layer 5. In actual use, the number of triangular inflatable portions 42 can be equal to the actual number required for use, or it can be greater than the actual number required for use.

[0033] The second filling piece 4 provided by the present invention is designed as an inflatable sleeve 41, and the inflatable sleeve 41 includes a plurality of triangular inflatable parts 42 connected in sequence, and a sealing membrane 43 is provided between adjacent triangular inflatable parts 42. On the one hand, the triangular inflatable part 42 can fill the gap formed by two adjacent cable units 2 and the armor layer 5, or the gap formed by two adjacent optical cable units 3 and the armor layer 5, or the gap formed by two adjacent cable units 2 and the optical cable unit 3 and the armor layer 5. The triangular structure can better adapt to the gap and provide a better filling support effect; on the other hand, compared with the prior art using multiple independent filling ropes, the inflatable sleeve 41 includes a plurality of triangular inflatable parts 42, and a sealing membrane 43 is provided between adjacent triangular inflatable parts 42. , multiple filling ropes are twisted together with the cable unit 2 and the optical cable unit 3, which has the problems of complicated and difficult operation and uneven tension. The second filling piece 4 of the present application is an integrated structure with good overall stability. When in use, it is directly sleeved on the outer periphery of the twisted cable unit 2 and the optical cable unit 3, with good tension uniformity, simple and convenient operation, buffering protection for the optical fiber, improving the signal transmission effect, extending the service life, and facilitating subsequent armoring; thirdly, by setting the sealing diaphragm 43, it is convenient to control the inflation amount of the triangular inflation part 42. According to actual use needs, an appropriate number of triangular inflation parts 42 can be filled to control the inflation, which is simple and convenient to operate.

[0034] Preferably, the mother-and-child sheath composite optical cable further comprises: a first filler 7, located on the periphery of the strength member 1, abutting against the cable unit 2 and / or the optical cable unit 3. The first filler 7 is twisted together with the cable unit 2 and the optical cable unit 3 so that the composite cable maintains a circular cross-section.

[0035] Preferably, first filling member 7 is an inflatable bag 71, which is composed of a plurality of sequentially connected circular inflatable portions 72, with a sealing membrane 43 disposed between adjacent circular inflatable portions 72. The plurality of sequentially connected circular inflatable portions 72 are defined as a first circular inflatable portion, a second circular inflatable portion, a third circular inflatable portion, and so on. An inflatable port is disposed at the top or bottom of the first circular inflatable portion.

[0036] During specific implementation, air is inflated into the inflation port of the first circular inflatable part, and the first circular inflatable part bulges into a circle and continues to be inflated. When the air pressure in the first circular inflatable part is greater than the bearing limit of the sealing diaphragm 43, the sealing diaphragm 43 is forced to rupture instantaneously, and the gas enters the second circular inflatable part from the first circular inflatable part through the ruptured sealing diaphragm 43. When the third circular inflatable part needs to be used, the above operation can be repeated.

[0037] It should be noted that the outer diameter of the circular inflatable portion 72 is the same as the outer diameter of the cable unit 2 and the optical cable unit 3. The number of circular inflatable portions 72 can be greater than or equal to the actual required number. The actual required number of circular inflatable portions 72 is determined based on the number of cable units 2 and the optical cable units 3. The cable units 2, and / or the optical cable units 3, and / or the cable units 2 and the optical cable units 3 are all abutted. The vacant positions need to be filled with circular inflatable portions 72. The inflated circular inflatable portions 72 abut against the cable units 2 and / or the optical cable units 3, thereby ensuring that the cross-section of the composite optical cable is circular. For example, when the total number of cable units 2 and optical cable units 3 is 3, one circular inflatable portion 72 is required for filling. When multiple circular inflatable portions 72 are needed for filling, it is only necessary to control the number of circular inflatable portions 72 to be inflated, which is simple and convenient to operate.

[0038] The first filling piece 7 provided by the present invention is designed as an inflatable bag 71, and the inflatable bag 71 is a plurality of circular inflatable parts 72 connected in sequence, and a sealing membrane 43 is provided between adjacent circular inflatable parts 72. On the first hand, the circular inflatable parts 72 can abut against the cable unit 2 and / or the optical cable unit 3, better fill the adaptation gap, and provide a better filling support effect; on the second hand, compared with the prior art that uses multiple independent filling ropes, multiple filling ropes are twisted together with the cable unit 2 and the optical cable unit 3, which has the problems of cumbersome operation and uneven tension, the multiple circular inflatable parts 72 of the present application are an integrated structure with good overall stability. When in use, they are directly twisted together with the cable unit 2 and the optical cable unit 3, with good tension uniformity, simple and convenient operation, buffering protection for the optical fiber, improving the signal transmission effect, extending the service life, and facilitating subsequent armoring; on the third hand, by setting the sealing membrane 43, it is easy to control the inflation amount of the circular inflatable part 72. According to actual use needs, an appropriate number of circular inflatable parts 72 can be filled to control the inflation, and the operation is simple and convenient.

[0039] Preferably, both the first filler 7 and the second filler 4 are filled with an inert gas. The inert gas is nitrogen, helium, or argon. The inert gas is compressible and can act as a buffer when the composite optical cable is subjected to external pressure or temperature changes. In particular, when the optical cable is squeezed, the inert gas can absorb and disperse the pressure to a certain extent, reducing the direct force on the optical fiber, preventing damage such as breakage or microcracks caused by the force, and thus protecting the physical and transmission properties of the optical fiber.

[0040] It is worth noting that the composite optical cable in the prior art needs to adapt the number and size of the filling ropes according to the number of optical fiber units and cable units. The present application only needs to control the inflation quantity of the triangular inflation portion 42 and the circular inflation portion 72 to achieve filling adaptation for different numbers of optical fiber units and cable units, thereby improving the convenience of operation.

[0041] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0042] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0043] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0044] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples" or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0045] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A mother-and-child sheathed composite optical cable, characterized in that: include: reinforcements; a cable unit located at the periphery of the reinforcement member; an optical cable unit, located at the periphery of the strength member and abutting against the electrical cable unit; a second filling piece, abutting against the electrical cable unit and / or the optical cable unit; an armor layer, sleeved on the outer circumference of the reinforcement member, the cable unit, the optical cable unit and the second filling member; The protective layer is sleeved on the outer periphery of the armor layer.

2. The mother-and-child sheathed composite optical cable according to claim 1, characterized in that: The optical cable unit comprises: optical fiber; a sub-loose tube, which is sleeved on the outer periphery of the optical fiber and filled with fiber paste, and the number is at least one; The mother loose sleeve is sleeved on the outer circumference of the daughter loose sleeve.

3. The mother-and-child sheathed composite optical cable according to claim 1, characterized in that: The cable unit comprises: Conductors; The insulating skin is sleeved on the outer periphery of the conductor.

4. The mother-and-child sheathed composite optical cable according to claim 1, characterized in that: The armor layer is a corrugated steel belt.

5. The mother-and-child sheathed composite optical cable according to claim 1, characterized in that: The material of the protective layer is medium-density polyethylene or low-smoke halogen-free polyolefin.

6. The mother-and-child sheath type composite optical cable according to claim 1, characterized in that: The material of the protective layer is medium-density polyethylene or low-smoke halogen-free polyolefin.

7. The mother-and-child sheathed composite optical cable according to any one of claims 1 to 5, characterized in that: The second filling piece is an inflatable sleeve, which is sleeved on the outer circumference of the electrical cable unit and the optical cable unit.

8. The mother-and-child sheath type composite optical cable according to any one of claims 1 to 5, characterized in that: The second filling piece is an inflatable sleeve, which is sleeved on the outer circumference of the electrical cable unit and the optical cable unit.

9. The mother-and-child sheath type composite optical cable according to any one of claims 1 to 5, characterized in that: The second filling piece is an inflatable sleeve, which is sleeved on the outer circumference of the electrical cable unit and the optical cable unit.

10. The mother-and-child sheath type composite optical cable according to any one of claims 1 to 5, characterized in that: The second filling piece is an inflatable sleeve, which is sleeved on the outer circumference of the electrical cable unit and the optical cable unit.

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