A fiber optic composite overhead ground wire with adaptive extreme temperature difference deformation

Abstract

This invention discloses an optical fiber composite overhead ground wire that adapts to extreme temperature difference deformation, relating to the field of optical cable technology. It solves the problem in existing technologies where optical fiber units are directly installed inside loose tubes, leading to damage and breakage due to excessive internal stress under extreme temperature conditions. The invention discloses an optical fiber composite overhead ground wire that adapts to extreme temperature difference deformation, comprising a ground wire body, which includes a tube body and optical fiber units. The tube body has an installation channel within it, and the optical fiber units are disposed within the installation channel. The diameter of the installation channel is larger than the diameter of the optical fiber units. The tube body also has several guide constraint grooves spaced axially along the installation channel. In the initial state of the ground wire body, the optical fiber units are arranged in a wavy shape within the installation channel, and the axial spacing between adjacent peaks and valleys of the optical fiber units is greater than the axial spacing between adjacent guide constraint grooves.

Description

Technical Field

[0001] This invention relates to the field of optical cable technology, and specifically to an optical fiber composite overhead ground wire that adapts to extreme temperature difference deformation. Background Technology

[0002] Fiber optic composite overhead ground wire is a special cable that combines the functions of traditional overhead ground wire and communication fiber optic cable. It is the core foundation for building power communication networks and smart grids. It is generally installed on top of high-voltage transmission lines to play the roles of lightning protection and communication.

[0003] The fiber optic composite overhead ground wire mainly consists of two parts. The first part is an armored section made of one or more layers of aluminum-clad steel wire or aluminum alloy wire twisted together. This armored section acts as a lightning protection wire, preventing the power transmission lines below from being struck by lightning. In addition, it can withstand huge short-circuit currents when the power transmission lines fail, ensuring the safety of the power grid. It also protects the internal fiber optic section. The second part is the optical fiber inside the external twisted wire. The optical fiber unit is set in a loose tube and filled with grease. The loose tube protects the optical fiber unit, which is responsible for communication. The grease prevents moisture and other external substances from invading and corroding the optical fiber unit.

[0004] However, in practical applications, it has been found that in high-altitude areas with extreme temperature differences, the materials of the fiber unit and the stranded part of the fiber-optic composite overhead ground wire are completely different, resulting in a large difference in their thermal expansion and contraction rates. In environments with smaller temperature differences, the changes caused by temperature differences are not significant, and the internal stress of the fiber is still within the design range. However, in areas with extreme temperature differences, the stranded part is made of metal, and its elongation and shortening are more drastic, which can easily lead to excessive internal stress in the fiber. This can cause the fiber to bend excessively or even break in the loose tube, resulting in the optical attenuation of the fiber exceeding the design range and affecting fiber optic communication.

[0005] Based on the above background, the inventors designed an optical fiber composite overhead ground wire that adapts to extreme temperature difference deformation, solving at least one of the above problems, and thus, this application is filed. Summary of the Invention

[0006] The purpose of this application is to provide an optical fiber composite overhead ground wire that adapts to extreme temperature difference deformation, solving the problem that in the prior art, the optical fiber unit is directly placed in the loose tube, which easily leads to damage and failure of the optical fiber unit due to excessive internal stress under extreme temperature difference conditions.

[0007] To address the above problems, this application provides the following technical solution:

[0008] This application provides an optical fiber composite overhead ground wire with optical fiber adaptive extreme temperature difference deformation, including a ground wire body, the ground wire body including a sleeve body and an optical fiber unit, the sleeve body is provided with an installation channel, the optical fiber unit is disposed in the installation channel, and the diameter of the installation channel is larger than the diameter of the optical fiber unit.

[0009] The sleeve body is also provided with several guide constraint grooves that are spaced apart along the axial direction of the installation channel.

[0010] In the initial state of the ground wire body, the optical fiber unit is arranged in a wave shape in the installation channel, and the axial spacing between adjacent peaks and valleys of the optical fiber unit is greater than the axial spacing between adjacent guide constraint grooves.

[0011] Optionally, a buffer pad is also included, which is disposed within the guide constraint groove, with the side of the buffer pad closest to the central axis of the mounting channel recessed toward the side of the guide constraint groove.

[0012] Optionally, the buffer pad is fitted and fixed inside the guide constraint groove on the side closest to the guide constraint groove.

[0013] Optionally, there is also a buffer space between the buffer pad and the guide constraint groove, and the buffer pad is fixed in the guide constraint groove by its edge area.

[0014] Optionally, it also includes a fixing sleeve that is coaxially arranged with the sleeve body and disposed within the installation channel;

[0015] The fixed sleeve is provided with a number of pad mounting ports distributed at intervals along its axial direction. The pad mounting ports are aligned with the guide constraint grooves in the sleeve body. The buffer pad is installed and fixed through the pad mounting ports and its central area protrudes into the guide constraint grooves.

[0016] Optionally, the pad mounting opening includes a circular protrusion and an annular mounting portion located circumferentially to the protrusion;

[0017] The buffer pad is circular in shape and its thickness gradually decreases from the center to the periphery;

[0018] The thickness of the annular mounting portion gradually decreases along the direction closer to the protrusion.

[0019] The buffer pad is attached and fixed to the annular mounting part and protrudes into the guide constraint groove through the protrusion.

[0020] Optionally, the transition area between the guide constraint groove and the installation channel is further provided with a rounded chamfer.

[0021] Optionally, the bottom shape of the cross-section of the guide constraint groove along the axial direction of the mounting channel is arc-shaped;

[0022] The bottom of the guide constraint groove along the radial section of the installation channel is arc-shaped, and two adjacent guide constraint grooves along the axial direction of the installation channel are staggered on both sides of the central axis of the installation channel.

[0023] Optionally, the bottom shape of the cross-section of the guide constraint groove along the axial direction of the mounting channel is arc-shaped;

[0024] The bottom of the guide constraint groove along the radial section of the installation channel is circular.

[0025] Optionally, the ground wire body may further include several stranded wire bodies, and the sleeve body and several stranded wire bodies are twisted together to form a ground wire body.

[0026] The beneficial effects of this invention are:

[0027] I. This application provides a guiding and constraining groove within the sleeve of the fiber optic composite overhead ground wire. When the fiber optic composite overhead ground wire is exposed to extreme temperature differences, the bending rate of the lower fiber unit in the fiber optic composite overhead ground wire can be guided and constrained. This allows for active management of the fiber unit's shape in terms of structure, avoiding the uncontrollable bending rate problem caused by passive bending of the fiber unit, and fundamentally solving the damage and destruction problem caused by excessive bending rate of the fiber unit.

[0028] Second, based on the above core concept, this application sets a buffer pad or coats a buffer coating in the guide constraint groove, which can not only play a buffering role when the optical fiber unit undergoes a preset deformation, avoiding hard contact between the optical fiber unit and the guide constraint groove, but also reduce the friction between the optical fiber unit and the guide constraint groove when the optical fiber unit undergoes micro deformation, thereby reducing the risk of micro bending loss of the optical fiber unit. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the axial cross-sectional structure of the optical fiber assembly in Embodiment 1 of this application, comparing three states.

[0030] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle.

[0031] Figure 3 This is a schematic diagram of the radial cross-sectional structure of the optical fiber assembly in Embodiment 1 of this application.

[0032] Figure 4 This is a schematic diagram of the cross-sectional structure of Embodiment 1 of this application.

[0033] Figure 5 This is a schematic diagram of the axial cross-sectional structure of the optical fiber assembly in Embodiment 2 of this application.

[0034] Figure 6This is a schematic diagram of the axial cross-sectional structure of the optical fiber assembly in Embodiment 3 of this application.

[0035] Figure 7 for Figure 6 A magnified view of a portion of point B in the middle.

[0036] Explanation of reference numerals in the attached drawings: 1-Fiber optic unit, 2-Sleeve body, 21-Installation channel, 22-Guiding constraint groove, 221-Buffer space, 23-Rounded chamfer, 3-Buffer pad, 4-Stranded cable body, 5-Fixing sleeve, 51-Pad mounting port, 511-Protrusion, 512-Installation part. Detailed Implementation

[0037] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0038] Example 1:

[0039] like Figures 1 to 4 As shown, this embodiment provides an optical fiber composite overhead ground wire with optical fiber adaptive extreme temperature difference deformation, including a ground wire body, the ground wire body including a sleeve body 2 and an optical fiber unit 1, the sleeve body 2 is provided with an installation channel 21, the optical fiber unit 1 is disposed in the installation channel 21, and the diameter of the installation channel 21 is larger than the diameter of the optical fiber unit 1.

[0040] The sleeve body 2 is also provided with a number of guide constraint grooves 22 that are spaced apart along the axial direction of the installation channel 21;

[0041] In the initial state of the ground wire body, the optical fiber unit 1 is arranged in a wave shape in the installation channel 21, and the axial spacing between adjacent peaks and valleys of the optical fiber unit 1 is greater than the axial spacing between adjacent guide constraint grooves 22.

[0042] In high-altitude areas, the extreme temperature difference between day and night—daytime temperatures under direct sunlight reaching 30-40 degrees Celsius while nighttime temperatures plummet below zero—leads to significant temperature variations. The stranded wire body 4 and the sheath body 2 in fiber optic composite overhead ground wires are typically made of metal, with a coefficient of linear expansion far exceeding that of the fiber optic unit 1. Therefore, in the extreme temperature conditions of high-altitude regions, the expansion and contraction of the stranded wire body 4 and the sheath body 2 are more pronounced than in ordinary areas. In other words, the relative expansion and contraction between the stranded wire body 4 and the sheath body 2 and the fiber optic unit 1 is greater in high-altitude regions. Thus, in ordinary areas, when the fiber optic unit 1 is placed within the sheath body 2 in conventional fiber optic composite overhead ground wires, a certain length redundancy is provided to ensure that the internal stress of the fiber optic unit 1 remains within the design range regardless of whether the stranded wire body 4 or the sheath body 2 expands or contracts relative to the fiber optic unit 1. However, if conventional technical approaches are followed, changing the fiber optic unit 1... Relative to the redundancy of the main body 2 of the sleeve, directly applying the fiber optic composite overhead ground wire to regions with large diurnal temperature differences or extreme temperature differences between different seasons will lead to structural contradictions in the fiber optic composite overhead ground wire under thermal expansion and contraction conditions. For example, increasing the length redundancy of the fiber optic unit 1 may result in acceptable tensile stress indicators in the fiber optic unit 1 under thermal expansion conditions, but excessive compressive stress indicators in the fiber optic unit 1 under thermal contraction conditions. Conversely, reducing the length redundancy of the fiber optic unit 1 may result in acceptable compressive stress and bending rate indicators in the fiber optic unit 1 under thermal contraction conditions, but excessive tensile stress indicators in the fiber optic unit 1 under thermal expansion conditions, potentially leading to fiber optic unit 1 breakage. Therefore, following the existing technical path of changing the length redundancy of the fiber optic unit 1, whether increasing or decreasing the redundancy of the fiber optic unit 1, cannot solve the internal stress problem of the fiber optic unit 1 under extreme temperature difference conditions.

[0043] This embodiment provides a simple and reliable new technical approach by setting a guiding and constraining groove 22 inside the sleeve body 2 of the optical fiber composite overhead ground wire. When the optical fiber composite overhead ground wire is in an extreme temperature difference environment, the bending rate of the lower optical fiber unit 1 in the optical fiber composite overhead ground wire can be guided and constrained. This allows for active management of the shape of the optical fiber unit 1 in terms of structure, avoiding the problem of uncontrollable bending rate caused by passive bending of the optical fiber unit 1, and fundamentally solving the problem of damage caused by excessive bending rate of the optical fiber unit 1.

[0044] In this embodiment, under the initial state of the fiber optic composite overhead ground wire (i.e., before the length of the ground wire body changes due to temperature difference or other reasons), the length redundancy of the fiber optic unit 1 is slightly greater than that of a conventional fiber optic composite overhead ground wire. This allows this embodiment to solve the tensile stress problem of the fiber optic unit 1 in high-temperature environments. In low-temperature environments, when the sheath body 2 and stranded wire body 4 of the ground wire body shorten significantly, causing the fiber optic unit 1 to bend, the bending process and final degree of bending of the fiber optic unit 1 can be guided and constrained by the guiding and constraining groove 22. The design of the guiding and constraining groove 22 allows the fiber optic unit 1 to extend a longer length within the sheath body 2. Therefore, the problem of excessive bending and compressive stress of the fiber optic unit 1 can be completely solved structurally. Thus, this application can solve the structural contradictions in the prior art for extreme temperature difference environments by adding the simple structural design of the guiding and constraining groove 22, effectively solving the problems of the prior art.

[0045] In this embodiment, a buffer pad 3 is also provided in the guide constraint groove 22. The side of the buffer pad 3 closest to the central axis of the mounting channel 21 is recessed toward the side of the guide constraint groove 22.

[0046] Based on the above core concept, this embodiment provides a buffer pad 3 in the guide constraint groove 22. Alternatively, the buffer pad 3 can be replaced with a buffer coating applied to the guide constraint groove 22. This not only provides a buffering effect when the fiber unit 1 undergoes a preset deformation, preventing hard contact between the fiber unit 1 and the guide constraint groove 22, but also reduces friction between the fiber unit 1 and the guide constraint groove 22 when the fiber unit 1 undergoes micro-deformation, thereby reducing the risk of micro-bending loss of the fiber unit 1.

[0047] In this embodiment, there is also a buffer space 221 between the buffer pad 3 and the guide constraint groove 22. The buffer pad 3 is fixed in the guide constraint groove 22 by its edge area. By setting the buffer space 221, the buffer structure located in the guide constraint groove 22 in this embodiment is a combined buffer structure composed of the buffer pad 3 and the buffer space 221, thereby improving the buffer performance.

[0048] In this embodiment, since a buffer space 221 is provided between the buffer pad 3 and the guide constraint groove 22, when necessary, the technician can replace the buffer pad 3 with a buffer mesh so that the buffer space 221 is connected to the installation channel 21 in the sleeve body 2.

[0049] In this embodiment, the connection transition area between the guide constraint groove 22 and the installation channel 21 is also provided with an arc-shaped chamfer 23 to avoid friction damage when the optical fiber unit 1 is bent and deformed in the installation channel 21.

[0050] In this embodiment, the spacing between adjacent guide constraint grooves 22 and the diameter of the mounting channel 21 can be set by technicians as required, and will not be elaborated here.

[0051] In this embodiment, the bottom shape of the cross-section of the guide constraint groove 22 along the axial direction of the mounting channel 21 is arc-shaped;

[0052] The bottom of the guide constraint groove 22 along the radial section of the installation channel 21 is arc-shaped, and two adjacent guide constraint grooves 22 along the axial direction of the installation channel 21 are staggered on both sides of the central axis of the installation channel 21.

[0053] In some embodiments, the cross-section of the guide constraint groove 22 along the radial or axial direction of the mounting channel 21 may also be set to other shapes, and the shape of the main body of the buffer pad 3 may be set to a crescent shape or other shapes, which will not be elaborated here.

[0054] In this embodiment, the ground wire body also includes several stranded wire bodies 4. The sleeve body 2 and several stranded wire bodies 4 are twisted together to form a ground wire body. The stranded wire body 4 in this embodiment is an existing structure. Twisting the stranded wire body 4 and the sleeve body 2 into a ground wire body is an existing conventional technology, which will not be described in detail here.

[0055] Example 2:

[0056] like Figure 5 As shown, in this embodiment, the buffer pad 3 is attached and fixed in the guide constraint groove 22 on the side near the guide constraint groove 22.

[0057] Compared to Example 1, in this embodiment 1, the buffer pad 3 is directly attached and fixed in the guide constraint groove 22, which has relatively low requirements for processing accuracy, can reduce the processing difficulty of the entire ground wire body, and avoid excessive processing costs.

[0058] In this embodiment, the bottom shape of the cross-section of the guide constraint groove 22 along the axial direction of the mounting channel 21 is arc-shaped;

[0059] The bottom of the cross-section of the guide constraint groove 22 along the radial section of the mounting channel 21 is circular, so that when the fiber unit 1 in this embodiment undergoes slight bending deformation, the fiber unit 1 will not be pressed against the mounting channel 21 due to the bending orientation, thus preventing the fiber unit 1 from having a poor guiding constraint effect.

[0060] The remaining structures in this embodiment are the same as those in Embodiment 1 above, and will not be described again here.

[0061] Example 3:

[0062] like Figure 6 and Figure 7As shown, in this embodiment, a fixed sleeve 5 is also included, which is coaxially arranged with the sleeve body 2 and disposed within the installation channel 21;

[0063] The fixed sleeve 5 is provided with a plurality of pad mounting ports 51 distributed at intervals along its axial direction. The pad mounting ports 51 are aligned with the guide constraint groove 22 in the sleeve body 2. The buffer pad 3 is installed and fixed through the pad mounting ports 51 and its central area protrudes into the guide constraint groove 22.

[0064] In this embodiment, by setting a fixed sleeve 5 inside the sleeve body 2, the manufacturing and processing of the sleeve body 2 and the fixed sleeve 5 are facilitated. In this embodiment, the sleeve body 2 and the fixed sleeve 5 are made of the same material to ensure that their expansion coefficients are the same.

[0065] In this embodiment, the pad mounting opening 51 includes a circular protrusion 511 and an annular mounting portion 512 located around the protrusion 511.

[0066] The buffer pad 3 is circular in shape and its thickness gradually decreases from the center to the periphery;

[0067] The thickness of the annular mounting portion 512 gradually decreases along the direction closer to the protrusion.

[0068] The buffer pad 3 is attached and fixed to the annular mounting part 512 and protrudes into the guide constraint groove 22 through the protrusion. In this embodiment, the buffer pad 3 can be fixed to the annular mounting part 512 by adhesive bonding.

[0069] In this embodiment, the guide constraint groove 22 has a rectangular cross-sectional shape along the axial section and an annular cross-sectional shape along the radial section. Of course, those skilled in the art can set the guide constraint groove 22 in this embodiment to other shapes as needed, which will not be elaborated here.

[0070] The remaining structures in this embodiment are the same as those in Embodiment 1 above, and will not be described again here.

[0071] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A fiber optic composite overhead ground wire with adaptive extreme temperature difference deformation, comprising a ground wire body, the ground wire body including a sleeve body (2) and an optical fiber unit (1), wherein the sleeve body (2) is provided with an installation channel (21), and the optical fiber unit (1) is disposed within the installation channel (21), characterized in that, The diameter of the installation channel (21) is larger than the diameter of the optical fiber unit (1); The sleeve body (2) is also provided with a number of guide constraint grooves (22) that are spaced apart along the axial direction of the installation channel (21). In the initial state of the ground wire body, the optical fiber unit (1) is arranged in a wave shape in the installation channel (21), and the axial spacing between adjacent peaks and valleys of the optical fiber unit (1) is greater than the axial spacing between adjacent guide constraint grooves (22). It also includes a buffer pad (3) set in the guide constraint groove (22), with the side of the buffer pad (3) near the central axis of the installation channel (21) recessed toward the side of the guide constraint groove (22).

2. The fiber optic composite overhead ground wire with optical fiber adaptive extreme temperature difference deformation according to claim 1, characterized in that, The buffer pad (3) is attached and fixed in the guide constraint groove (22) on the side near the guide constraint groove (22).

3. The fiber optic composite overhead ground wire with optical fiber adaptive extreme temperature difference deformation according to claim 1, characterized in that, There is also a buffer space (221) between the buffer pad (3) and the guide constraint groove (22), and the buffer pad (3) is fixed in the guide constraint groove (22) by its edge area.

4. The fiber optic composite overhead ground wire with optical fiber adaptive extreme temperature difference deformation according to claim 1, characterized in that, It also includes a fixed sleeve (5) that is coaxially arranged with the sleeve body (2) and located in the installation channel (21); The fixed sleeve (5) is provided with a plurality of pad mounting ports (51) spaced apart along its axial direction. The pad mounting ports (51) are aligned with the guide constraint groove (22) in the sleeve body (2). The buffer pad (3) is installed and fixed through the pad mounting ports (51) and its central area protrudes into the guide constraint groove (22).

5. The fiber optic composite overhead ground wire with optical fiber adaptive extreme temperature difference deformation according to claim 4, characterized in that, The pad mounting opening (51) includes a circular protrusion (511) and an annular mounting portion (512) located around the protrusion (511). The buffer pad (3) is circular in shape and its thickness gradually decreases from the center to the periphery; The thickness of the annular mounting portion (512) gradually decreases along the direction closer to the protrusion; The buffer pad (3) is attached and fixed to the annular mounting part (512) and protrudes into the guide constraint groove (22) through the protruding outlet.

6. The fiber optic composite overhead ground wire with optical fiber adaptive extreme temperature difference deformation according to claim 1, characterized in that, The transition area between the guide constraint groove (22) and the installation channel (21) is also provided with an arc-shaped chamfer (23).

7. The fiber optic composite overhead ground wire with optical fiber adaptive extreme temperature difference deformation according to claim 1, characterized in that, The bottom shape of the cross section of the guide constraint groove (22) along the axial direction of the installation channel (21) is arc-shaped; The bottom of the cross section of the guide constraint groove (22) along the radial section of the installation channel (21) is arc-shaped, and two adjacent guide constraint grooves (22) along the axial direction of the installation channel (21) are staggered on both sides of the central axis of the installation channel (21).

8. The fiber optic composite overhead ground wire with optical fiber adaptive extreme temperature difference deformation according to claim 1, characterized in that, The bottom shape of the cross section of the guide constraint groove (22) along the axial direction of the installation channel (21) is arc-shaped; The bottom of the cross-section of the guide constraint groove (22) along the radial section of the installation channel (21) is circular.

9. The fiber optic composite overhead ground wire with optical fiber adaptive extreme temperature difference deformation according to claim 1, characterized in that, The ground wire body also includes several stranded wire bodies (4), and the sleeve body (2) and several stranded wire bodies (4) are twisted together to form a ground wire body.

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