Optical fiber composite cable

Abstract

The utility model belongs to optical cable technical field discloses a kind of optical fiber composite cable, including the cable core of multiple mutual stranding, wrapping layer and sheath layer, cable core includes optical fiber unit, conductor, insulating layer, optical fiber unit is located at the center of conductor, including optical fiber, body stainless steel pipe and continuation stainless steel pipe, optical fiber is placed in body stainless steel pipe, continuation stainless steel pipe is sleeved in the one end of body stainless steel pipe along length direction, and spacing is left with the port of body stainless steel pipe, the cross section shape of continuation stainless steel pipe is spiral shape with opening, insulating layer is covered in the outer periphery of conductor, optical fiber length is greater than conductor length, exposed optical fiber is stored in body stainless steel pipe, wrapping layer is spirally wound in the outer periphery of multiple cable core, sheath layer is covered in the outer periphery of wrapping layer.Optical fiber composite cable continuation time operation is simple, and optical fiber performance in optical fiber composite cable after continuation is stable, and optical fiber composite cable temperature can be accurately detected.

Description

Technical Field

[0001] This utility model relates to the field of optical fiber cable technology, and in particular to an optical fiber composite cable. Background Technology

[0002] Power cables are widely used in the transmission and distribution of electrical energy in power systems. To ensure the safety of power cables during use, it is necessary to monitor their temperature in real time. Currently, the commonly used temperature measurement method is to bind optical fibers to the outer surface of the power cable to achieve real-time temperature monitoring. However, there is a significant temperature difference between the outer surface of the power cable and its conductor, meaning that the temperature reading obtained by binding optical fibers to the outer surface of the power cable is inaccurate.

[0003] Therefore, some existing power cables place optical fibers at the center of the conductor to accurately monitor the cable temperature. However, for power engineering projects involving long-distance power transmission, cable splicing is necessary to achieve this. When stripping and splicing the optical fibers from the power cable, a stainless steel sleeve must be fitted over the pre-stripped fibers. After splicing, the stainless steel sleeve is moved to the splice point for protection. However, workers may slightly bend the optical fibers when fitting them with the stainless steel sleeve. Since optical fibers are brittle, even slight bending can damage their performance, thus affecting the accuracy of temperature monitoring in the power cable.

[0004] Therefore, there is an urgent need for a fiber optic composite cable to solve the above-mentioned technical problems. Utility Model Content

[0005] The purpose of this invention is to provide an optical fiber composite cable that can solve the problem that when workers are installing stainless steel sleeves on optical fibers, they may slightly bend the optical fibers, which could damage the performance of the optical fibers and thus affect the accuracy of optical fiber temperature monitoring.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A fiber optic composite cable, comprising:

[0008] The cable comprises multiple intertwined cable cores, a cladding layer, and a sheath layer. Each cable core includes an optical fiber unit, a conductor, and an insulation layer. The optical fiber unit is located at the center of the conductor and includes an optical fiber, a main stainless steel tube, and a splicing stainless steel tube. The optical fiber is placed inside the main stainless steel tube, and the splicing stainless steel tube is fitted onto one end of the main stainless steel tube along its length, with a gap between it and the port of the main stainless steel tube. The cross-sectional shape of the splicing stainless steel tube is a spiral shape with an opening. The insulation layer covers the outer periphery of the conductor. The length of the optical fiber is greater than the length of the conductor, and the exposed optical fiber is stored inside the main stainless steel tube. The cladding layer is spirally wound around the outer periphery of the multiple cable cores. The sheath layer covers the outer periphery of the cladding layer.

[0009] As a preferred technical solution for optical fiber composite cables, the conductor is formed by welding multiple copper wire strands layer by layer, and the copper wire strands placed in the inner layer are welded to the stainless steel tube body.

[0010] As a preferred technical solution for optical fiber composite cables, the solder joints of the copper wire strands in adjacent layers are staggered.

[0011] As a preferred technical solution for optical fiber composite cables, the staggered distance between the solder joints of the copper wire strands in adjacent layers is greater than 2cm.

[0012] As a preferred technical solution for optical fiber composite cables, the sheath layer includes an inner sheath, an armor layer, and an outer sheath arranged sequentially from the inside to the outside.

[0013] As a preferred technical solution for optical fiber composite cables, the armor layer is formed by spirally winding non-magnetic stainless steel strip around the outer periphery of the inner sheath.

[0014] As a preferred technical solution for optical fiber composite cables, the overlap rate of the non-magnetic stainless steel strip ranges from 20% to 50%.

[0015] As a preferred technical solution for optical fiber composite cables, the cladding layer is formed by spirally wrapping tape around the outer periphery of multiple cable cores.

[0016] As a preferred technical solution for optical fiber composite cables, the outer periphery of the conductor is wrapped with a semi-conductive strip.

[0017] As a preferred technical solution for optical fiber composite cables, the optical fiber composite cables further include fillers, which are placed in the gaps between the multiple cable cores and the cladding.

[0018] The beneficial effects of this utility model are as follows:

[0019] The fiber optic composite cable provided by this utility model features a splicing stainless steel tube within the fiber optic unit. This tube is fitted over one end of the main stainless steel tube along its length, with a gap between them. Because the cross-sectional shape of the splicing stainless steel tube is an open, spiral shape, after splicing the fibers in the fiber optic composite cable, the tube can be pulled out and then rotated. The spliced ​​fiber can then enter the opening of the tube. With continued rotation, the spliced ​​fiber can penetrate the interior of the tube. The entire process requires only gentle support of the spliced ​​fiber, ensuring that the fiber is not bent by external force. This allows the stainless steel tube to be fitted at the splice point of the two fibers in the fiber optic composite cable. Compared to existing methods that pre-fit stainless steel tubes, this avoids the problem of fiber bending after being fitted into the tube, which could damage fiber performance during splicing. This results in a spliced ​​fiber optic composite cable with stable fiber performance, accurate conductor temperature monitoring, and guaranteed stable power transmission over long distances. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the optical fiber composite cable provided by this utility model;

[0021] Figure 2 This is a schematic diagram of the structure of the optical fiber unit provided by this utility model;

[0022] Figure 3 This is a schematic diagram of the structure of the connecting stainless steel pipe provided by this utility model;

[0023] Figure 4 This is a schematic diagram of the splicing method for optical fiber composite cables provided by this utility model.

[0024] In the picture:

[0025] 1. Cable core; 11. Fiber optic unit; 111. Fiber optic cable; 112. Main body stainless steel tube; 113. Splice stainless steel tube; 1131. Opening; 12. Conductor; 13. Insulation layer; 14. Shielding layer;

[0026] 2. Wrapping layer;

[0027] 3. Sheath layer; 31. Inner protective layer; 32. Armor layer; 33. Outer protective layer; 4. Filler. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0029] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0031] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0032] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0033] like Figures 1 to 3As shown in the illustration, this embodiment provides an optical fiber composite cable, comprising multiple twisted cable cores 1, a wrapping layer 2, and a sheath layer 3. The wrapping layer 2 is spirally wound around the outer periphery of the multiple cable cores 1 to prevent the twisted cable cores 1 from loosening. The sheath layer 3 covers the outer periphery of the wrapping layer 2 and is used to protect the optical fiber composite cable. The cable core 1 includes an optical fiber unit 11, a conductor 12, and an insulation layer 13. The optical fiber unit 11 is located at the center of the conductor 12 to achieve more accurate temperature monitoring of the optical fiber composite cable. The insulation layer 13 may be made of cross-linked polyethylene.

[0034] The optical fiber unit 11 includes an optical fiber 111, a main stainless steel tube 112, and a splicing stainless steel tube 113. The optical fiber 111 is placed inside the main stainless steel tube 112, which protects the optical fiber 111, preventing it from being compressed and affecting its performance. The main stainless steel tube 112 also shields against external electromagnetic interference, improving the accuracy of the temperature of the conductor 12 monitored by the optical fiber 111. The splicing stainless steel tube 113 is fitted onto one end of the main stainless steel tube 112 along its length, with a gap between it and the end of the main stainless steel tube 112. The cross-sectional shape of the splicing stainless steel tube 113 is a spiral shape with an opening 1131. After the worker completes the splicing of the optical fiber 111 in the fiber optic composite cable, the splicing stainless steel tube 113 can be pulled out. Then, the splicing stainless steel tube 113 is rotated, allowing the spliced ​​optical fiber 111 to enter the opening 1131 of the splicing stainless steel tube 113. As the splicing stainless steel tube 113 is continued to be rotated, the spliced ​​optical fiber 111 can enter the interior of the splicing stainless steel tube 113. The entire process only requires gently holding the spliced ​​optical fiber 111. Without bending the optical fiber 111 by external force, the splicing stainless steel tube 113 can be fitted onto the splice of the optical fiber 111 in the two fiber optic composite cables. Compared with the existing method of pre-fitting stainless steel sleeves, this avoids the problem of the optical fiber 111 bending after being fitted into the stainless steel sleeve, which would damage the performance of the optical fiber 111 during the splicing of the fiber optic composite cable. This ensures that the performance of the optical fiber 111 in the spliced ​​fiber optic composite cable is stable, and the temperature of the conductor 12 can be accurately monitored, guaranteeing that the long-distance fiber optic composite cable can stably transmit electrical energy.

[0035] The insulation layer 13 covers the outer periphery of the conductor 12, giving the cable core 1 insulation properties, reducing the risk of short circuits in the fiber optic composite cable core 1 during power transmission, and improving the safety of the fiber optic composite cable. The length of the fiber optic cable 111 is greater than the length of the conductor 12, facilitating splicing between fibers 111 and reducing the difficulty for workers when splicing fibers 111. The exposed fibers 111 are stored within the main body stainless steel tube 112, protecting the fibers 111 while maintaining the overall aesthetics of the fiber optic composite cable.

[0036] In this embodiment, the cable core 1 also includes a shielding layer 14, which covers the outer periphery of the insulation layer 13, improves the shielding of the cable core 1, reduces the interference of external electromagnetic radiation on the conductor 12, and enables the cable core 1 to transmit electrical energy stably, thereby enabling the optical fiber composite cable to transmit electrical energy stably.

[0037] In this embodiment, the optical fiber composite cable also includes a filler 4, which fills the gaps between the multiple cable cores 1 and the wrapping layer 2. The filler 4 makes the optical fiber composite cable more rounded and improves its compression resistance. The filler 4 can be made of polypropylene filler rope, polyester fiber filler tape, jute rope, or cotton yarn tape; no specific limitations are imposed.

[0038] In this embodiment, the conductor 12 is formed by welding multiple copper wire strands layer by layer, with the inner layer of copper wire strands welded to the main body stainless steel tube 112. This prevents the optical fiber unit 11 and the conductor 12 from hinged together, preventing deformation of the optical fiber unit 11 and further ensuring the stability of the optical fiber 111's performance. The layer-by-layer welding of multiple copper wire strands ensures tight adhesion between them, enabling the optical fiber composite cable to transmit electrical energy stably. The welding of the inner layer of copper wire strands to the main body stainless steel tube 112 prevents the optical fiber unit 11 from shifting relative to the conductor 12, further improving the accuracy of the optical fiber 111 in monitoring the temperature of the conductor 12. Furthermore, the spot welding of the inner layer of copper wire strands to different positions on the stainless steel body not only fixes the stainless steel body to the conductor 12 but also allows the connecting stainless steel tube 113 to be pulled out relative to the main body stainless steel tube 112 and rotated relative to it. Furthermore, the solder joints of adjacent copper wire strands are staggered, which allows for a more compact multi-layer copper wire strand layout and more stable power transmission. Simultaneously, the cable core 1 is more rounded, resulting in a more rounded optical fiber 111 power cable and further improving its voltage withstand capability. Specifically, the solder joints of adjacent copper wire strands are staggered by more than 2cm, ensuring complete staggering of the solder joints between adjacent layers. This further guarantees a tight fit between the copper wire strands, allowing the conductor 12 to transmit power more stably.

[0039] In this embodiment, the sheath layer 3 includes an inner sheath 31, an armor layer 32, and an outer sheath 33 arranged sequentially from the inside out. Specifically, the inner sheath 31 covers the outer periphery of the wrapping layer 2, the armor layer 32 covers the outer periphery of the inner sheath 31, and the outer sheath 33 covers the outer periphery of the armor layer 32. This arrangement further improves the pressure resistance of the sheath layer 3. The inner sheath 31, covering the wrapping layer 2, prevents the wrapping layer 2 from loosening, ensuring the compactness of the fiber optic composite cable. The inner sheath 31 can be made of cross-linked polyethylene, which, while preventing the wrapping layer 2 from loosening, also improves the insulation of the fiber optic composite cable, further enhancing its safety. The armor layer 32 improves the compressive strength of the fiber optic power cable and also enhances its tensile strength, reducing the degree of mechanical damage when the fiber optic composite cable is compressed or pulled. The armor layer 32 also improves its resistance to external electromagnetic interference, further enhancing the stability of power transmission in the fiber optic composite cable. The sheath layer 3 can be made of polyvinyl chloride or polyethylene to ensure the abrasion resistance and compression resistance of the optical fiber composite cable.

[0040] For example, the armor layer 32 can be formed by spirally winding a non-magnetic stainless steel strip around the outer periphery of the inner sheath 31. The processing procedure is simple and can reduce the difficulty of processing the armor layer 32 for workers. The overlap rate of the stainless steel strip is between 20% and 50%, which ensures that the armor layer 32 completely covers the inner sheath 31 while the wrapped armor layer 32 is flat overall, thereby ensuring the roundness of the optical fiber composite cable.

[0041] In this embodiment, the cladding layer 2 is formed by spirally winding a wrapping tape around the outer periphery of multiple cable cores 1. The wrapping tape can be selected from synthetic mica tape, polyester tape, or glass fiber coated fabric tape, depending on design requirements; no specific limitations are imposed here.

[0042] like Figure 4 As shown in the figure, this embodiment provides a method for splicing optical fiber composite cables, used to splice the aforementioned optical fiber composite cables. The method for splicing optical fiber composite cables includes the following steps:

[0043] Strip 700mm to 1000mm of the sheath layer 3 at the end of the two fiber optic composite cables that needs to be spliced, and strip 250mm to 300mm of the wrapping layer 2, so that the cable core 1 is exposed.

[0044] The insulation layer 13 and shielding layer 14 of each cable core 1 are stripped by 190mm to 200mm.

[0045] The conductor 12 and the main body stainless steel tube 112 are cut 15mm apart, the optical fiber 111 stored in the main body stainless steel tube 112 is taken out, and a flexible tube is installed over the optical fiber 111; specifically, the flexible tube is made of polyethylene.

[0046] Remove 5mm to 10mm of the sheath from optical fiber 111 to expose the bare fiber.

[0047] The exposed bare fibers in the two fiber optic composite cables are fused together, and the flexible tube is moved to the fusion point of the two bare fibers; the flexible tube is then heat-fused; in this way, the flexible tube can protect the fusion point of the bare fibers, and the quality of the fusion between the bare fibers is further improved.

[0048] Pull out the connecting stainless steel tube 113, which is sleeved outside the main stainless steel tube 112, and rotate the connecting stainless steel tube 113 so that the fused optical fiber 111 enters its interior through the opening 1131 of the connecting stainless steel tube 113. The connecting stainless steel tube 113 further protects the fusion joint and prevents the fused conductor 12 from squeezing the fusion joint.

[0049] The conductors 12 in the two fiber optic composite cables are welded together, the insulation layer 13 is connected using insulating tape, and the shielding layer 14 is connected by wrapping shielding tape.

[0050] The wrapping layer 2 is connected by wrapping tape, and the sheath layer 3 is connected by wrapping waterproof tape.

[0051] Preferably, a semiconducting tape is also wound around the outer periphery of the conductor 12. The wound semiconducting tape is flush with the insulation layer 13, which can avoid gaps between the conductor 12 and the insulation layer 13, avoid the risk of partial discharge between the conductor 12 and the insulation layer 13 when the optical fiber composite cable is transmitting electrical energy, and further improve the safety of the optical fiber composite cable.

[0052] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A fiber optic composite cable, characterized in that, include: The cable consists of multiple intertwined cable cores (1), a wrapping layer (2), and a sheath layer (3). Each cable core (1) includes an optical fiber unit (11), a conductor (12), and an insulation layer (13). The optical fiber unit (11) is located at the center of the conductor (12). Each optical fiber unit (11) includes an optical fiber (111), a main stainless steel tube (112), and a connecting stainless steel tube (113). The optical fiber (111) is placed inside the main stainless steel tube (112), and the connecting stainless steel tube (113) is sleeved on the main stainless steel tube (112) along its length. One end of the connecting stainless steel tube (113) is separated from the port of the main body stainless steel tube (112), and the cross-sectional shape of the connecting stainless steel tube (113) is a spiral shape with an opening (1131); the insulating layer (13) covers the outer periphery of the conductor (12); the length of the optical fiber (111) is greater than the length of the conductor (12), and the exposed optical fiber (111) is stored in the main body stainless steel tube (112); the wrapping layer (2) is spirally wound around the outer periphery of multiple cable cores (1); the sheath layer (3) covers the outer periphery of the wrapping layer (2).

2. The optical fiber composite cable according to claim 1, characterized in that, The conductor (12) is formed by welding multiple copper wire strands together, with the copper wire strands placed in the inner layer being welded to the stainless steel tube (112) of the main body.

3. The optical fiber composite cable according to claim 2, characterized in that, The solder joints of the copper wire strands in adjacent layers are staggered.

4. The optical fiber composite cable according to claim 3, characterized in that, The staggered distance between the solder joints of the copper wire strands in adjacent layers is greater than 2cm.

5. The optical fiber composite cable according to claim 1, characterized in that, The sheath layer (3) includes an inner sheath layer (31), an armor layer (32), and an outer sheath layer (33) arranged sequentially from the inside to the outside.

6. The optical fiber composite cable according to claim 5, characterized in that, The armor layer (32) is formed by spirally winding a non-magnetic stainless steel strip around the outer periphery of the inner protective layer (31).

7. The optical fiber composite cable according to claim 6, characterized in that, The overlap rate of the non-magnetic stainless steel strip ranges from 20% to 50%.

8. The optical fiber composite cable according to claim 1, characterized in that, The wrapping layer (2) is formed by wrapping tape spirally wound around the outer periphery of multiple cable cores (1).

9. The optical fiber composite cable according to claim 1, characterized in that, The outer periphery of the conductor (12) is wrapped with a semiconducting strip.

10. The optical fiber composite cable according to claim 1, characterized in that, The optical fiber composite cable also includes a filler (4), which fills the gaps between the multiple cable cores (1) and the wrapping layer (2).

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