Air-blowing optical cable

Abstract

The invention discloses an air-blowing optical cable which comprises a cable core and an outer protective layer wrapping the cable core, a protruding strip is arranged on the outer wall of the outer protective layer, the height direction of the protruding strip extends towards the outer side in the radial direction of the optical cable, the length direction of the protruding strip extends in the axial direction of the air-blowing optical cable, and the protruding strip spirally surrounds the outer surface of the outer protective layer. The gas advances in the spiral direction of the protruding strips, thrust components on the optical cable are generated in the axial direction, the pushing force Ff of the thrust components pushing the optical cable to move per meter is larger than 50 N. The protruding strips are arranged on the outer side of the outer sheath, the friction force generated when the optical cable and an outer pipeline are laid is reduced, and it is guaranteed that laying of the gas-blowing optical cable is completed. And meanwhile, the pushing force Ff for controlling the gas to push the optical cable to move is greater than 50N per meter, so that the laying of the optical cable can be completed more quickly and stably, and time and labor are saved.

Description

Technical Field

[0001] The invention relates to an optical cable product, in particular to an air-blown optical cable. Background Art

[0002] Air-blown optical cable is a technology that uses compressed gas (usually air) to pass optical cables or electrical cables through the inside of a pipe. This technology is mainly used for optical fiber wiring or cable wiring, especially in places where manual laying is difficult, such as long-distance underground pipes. Air-blown optical cable has the advantages of efficient cable laying, reduced damage, long-distance cable laying, reduced labor intensity, and strong scalability. Therefore, it is widely used in the telecommunications industry and other fields that require long-distance cable laying, especially in the construction of optical fiber networks.

[0003] However, the current air-blown optical cable has a low laying efficiency and cannot be laid quickly and efficiently. Therefore, there is a need for an optical cable that can be laid quickly and efficiently. Summary of the invention

[0004] The invention overcomes the shortcomings of the prior art and provides an air-blown optical cable.

[0005] To achieve the above object, the technical solution adopted by the present invention is: an air-blown optical cable, comprising a cable core and an outer sheath covering the cable core, a convex strip is arranged on the outer wall of the outer sheath, the height direction of the convex strip extends outward along the radial direction of the optical cable, the length direction of the convex strip extends along the length direction of the air-blown optical cable, and spirally surrounds the outer surface of the outer sheath, the gas advances along the spiral direction of the convex strip, and generates a thrust component on the optical cable in the axial direction, and the thrust component pushes the optical cable to move per meter. f The driving force F is greater than 50N per meter. f The calculation formula is: ; in: ; ; ; F f The driving force exerted on the optical cable during the air blowing process; S is the total length of the convex strip starting point after it is expanded along the circumference of the optical cable; is the compound friction multiplier; r is the radius of the cable sheath; p is the pitch; L is the total length of the optical cable; θ is the acute angle between the spiral convex strip and the axial direction of the optical cable; P Pis the pressure inside the pipe under the given air blowing equipment and pipeline; h is the height of the ridge.

[0006] More specifically, the pitch of the spiral convex strips is set to be less than or equal to 0.5 m.

[0007] More specifically, the pitch of the spiral convex strips is set to 0.01-0.5m.

[0008] More specifically, on any radial surface of the air-blown optical cable, the shape of the convex strip is set to be an arc or a trapezoid.

[0009] More specifically, a reinforcement piece is arranged inside the outer sheath, and the reinforcement piece is evenly arranged inside the outer sheath in a circumferential direction.

[0010] More specifically, the reinforcement is configured as an aramid fiber rod or a glass fiber rod.

[0011] More specifically, the outer sheath is made of polyethylene material.

[0012] More specifically, the cable core includes a plurality of optical fibers and a bonding portion for bonding the plurality of optical fibers discontinuously in the axial direction, and two color wires are arranged outside the plurality of optical fibers, and the two color wires are wound forwards and reversely to bundle the plurality of optical fibers into a bundle.

[0013] More specifically, any bonding portion on any optical fiber is a first reference bonding portion, the adjacent bonding portion on the optical fiber adjacent to the first reference bonding portion is a second reference bonding portion, and the adjacent bonding portion on the optical fiber adjacent to the second reference bonding portion is a third reference bonding portion, and the first reference bonding portion, the second reference bonding portion and the third reference bonding portion are on the same straight line.

[0014] Specifically, the rigidity of the air-blown optical cable is set to 0.45-1.85 N·m 2 .

[0015] The present invention solves the defects existing in the background technology and has the following beneficial effects: a convex strip is arranged on the outer side of the outer sheath to reduce the friction between the optical cable and the outer pipeline during the laying, thereby ensuring the completion of the laying of the air-blown optical cable; at the same time, the driving force F of the gas to push the optical cable to move is controlled. f With a force greater than 50N per meter, the optical cable can be laid more quickly and smoothly, saving time and effort. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention is further described below in conjunction with the accompanying drawings and embodiments; Figure 1 It is a cross-sectional view of the optical cable cut along the radial direction in which the convex strip of the present invention is arranged in an arc shape; Figure 2It is a cross-sectional view of the optical cable cut along the radial direction in which the convex strips of the present invention are arranged in a trapezoidal shape; Figure 3 It is a schematic diagram of the structure of a plurality of optical fibers and a bonding portion forming an optical fiber ribbon according to the present invention; Figure 4 It is a schematic structural diagram of an optical fiber ribbon and a water-blocking yarn of the present invention bundled by color wires to form an optical fiber bundle; Figure 5 It is a schematic diagram of the specific correspondence of various physical quantities on the surface of the optical cable of the present invention; In the figure: 1, cable core; 11, optical fiber; 12, bonding part; 13, water-blocking yarn; 14, color line; 15, optical fiber ribbon; 16, optical fiber bundle; 2, water-blocking tape; 3, outer sheath; 4, reinforcement; 5, convex strip. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical scheme and advantages of the implementation of the present invention clearer, the technical scheme in the embodiment of the present invention will be described in more detail below in conjunction with the drawings in the embodiment of the present invention. In the drawings, the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The described embodiments are part of the embodiments of the present invention, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limitations on the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0018] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present invention. The embodiments of the present invention are described in detail below in conjunction with the drawings.

[0019] It should be understood that the drawings are only used to illustrate the present application.

[0020] The present invention will now be further described in detail with reference to the accompanying drawings and embodiments. These drawings are simplified schematic diagrams that only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0021] An air-blown optical cable, such as Figure 1-Figure 5 As shown, it includes a cable core 1 and an outer sheath 3 covering the cable core 1 .

[0022] like Figure 3 As shown, the cable core 1 includes a plurality of optical fibers 11 and a bonding portion 12 for axially discontinuously bonding the plurality of optical fibers 11, any bonding portion 12 on any optical fiber 11 is a first reference bonding portion, an adjacent bonding portion 12 on the optical fiber 11 adjacent to the first reference bonding portion is a second reference bonding portion, an adjacent bonding portion 12 on the optical fiber 11 adjacent to the second reference bonding portion is a third reference bonding portion, and the first reference bonding portion, the second reference bonding portion and the third reference bonding portion are on the same straight line. For example, three optical fibers 11 are provided, which are respectively the first optical fiber, the second optical fiber and the third optical fiber in sequence. Three bonding portions 12 are provided on each optical fiber 11, which are respectively the first bonding portion, the second bonding portion and the third bonding portion in sequence. The first bonding portion on the second optical fiber is defined as a first reference bonding portion. The optical fibers adjacent to the first reference bonding portion are the first optical fiber and the third optical fiber. The bonding portions adjacent to the first reference bonding portion are the first bonding portion of the first optical fiber and the first bonding portion of the third optical fiber. The two first bonding portions are the second reference bonding portion. If there is a fourth optical fiber, the optical fiber adjacent to the second reference bonding portion is the fourth optical fiber. The first bonding portion adjacent to the second reference bonding portion is the first bonding portion of the fourth optical fiber. This first bonding portion is the third reference bonding portion. The first reference bonding portion, the second reference bonding portion and the third reference bonding portion are on the same straight line. That is, the first bonding portions of the first optical fiber, the second optical fiber, the third optical fiber and the fourth optical fiber are on the same straight line.

[0023] The optical fiber ribbon 15 adopts high-precision glue dispensing technology, so that the adjacent bonding parts 12 of any adjacent optical fibers 11 are connected on the same straight line. In this solution, the bonding parts 12 are set as glue points, and the deviation between them is less than 0.1mm. High precision is conducive to ensuring that the difference between the cross-sections of several optical fibers 11 after cutting is extremely small during the overall welding process of the optical fiber ribbon 15, which guarantees the stability of the welding performance to the maximum extent and helps to reduce the welding loss.

[0024] In this solution, the size of the bare optical fiber is set between 230μm and 240μm. After the optical fiber 11 is colored, the size of the optical fiber 11 is between 235μm and 245μm. Then, a layer of resin is coated on the surface of the optical fiber 11. After coating with resin, the size of the optical fiber 11 is between 240μm and 250μm.

[0025] The glue length of optical fiber 11 is D2 = 20 ± 5mm, the glue distance of optical fiber 11 is D3 = 40 ± 5mm, and the size of D4 under inclination is just D4 = D2 * (number of optical fibers 11 - 1), and the overall width of optical fiber bundle 16 is D1 = the size of optical fiber 11 after resin coating * N + (40 ~ 60μm), where 40 ~ 60μm is the correction factor, that is, the tiny gap directly existing in optical fiber 11, providing optical fiber 11 with higher mobility and external force resistance. Compared with the optical fiber ribbon 15 bonded with traditional glue dots, the same strength can be achieved with smaller glue dots, and if the same glue dot size is used, greater strength can be obtained.

[0026] The optical fiber ribbon 15 with a glue-point structure can ensure tight bonding between the optical fibers 11 with a very small amount of glue. The traditional optical fiber ribbon 15 is fully coated with resin, which will cause the overall structure of the optical fiber ribbon 15 to solidify. Once the optical fiber ribbon 15 is wound, it will be damaged, so it occupies a fixed space in the optical cable; the optical fiber ribbon 15 disclosed in this solution can roll the entire optical fiber 11 into a strand, and can also be twisted less than one circle, which greatly enhances its flexibility, greatly reduces the space required by the optical fiber ribbon 15, and provides a smaller bending radius.

[0027] like Figure 4 As shown, two color wires 14 are arranged outside the plurality of optical fibers 11, and the two color wires 14 are wound forward and backward to bundle the plurality of optical fibers 11 into a bundle, and the plurality of optical fibers 11 are bonded to form an optical fiber ribbon 15, and the two color wires 14 can bundle only one optical fiber ribbon 15, or bundle multiple optical fibers, and one or more optical fiber ribbons 15 and a water-blocking yarn are combined to form an optical fiber bundle 16 by winding the two color wires, and a water-blocking yarn 13 is arranged inside the optical fiber bundle 16, and the water-blocking yarn 13 is made of high-expansion water-blocking yarn, and the color wires 14 bundle one or more optical fiber ribbons 15 and a water-blocking yarn 13 to form an optical fiber bundle 16, and the plurality of optical fiber bundles 16 are twisted into a cable core 1. Prepare one or more optical fiber ribbons 15 and a high-expansion water-blocking yarn, and then prepare two color wires 14, and bundle one or more optical fiber ribbons 15 and a water-blocking yarn 13 by forward and backward winding. The color line 14 is made of 111D polyester yarn, and the polyester yarn can be designed into different colors according to requirements, which is convenient for distinguishing different optical fiber bundles 16. The optical fiber ribbons 15 in any bundle can be distinguished by spraying marks. The pitch of the color line 14 is set to be less than 7cm. The pitch of the color line 14 is made into a small pitch, which can better distinguish the optical fiber bundles 16 directly. Traditional optical fiber bundles 16 often only have codes on the surface of the optical fiber ribbon 15. When the coding is used as the main identification method, it is difficult to quickly distinguish the various optical fiber bundles 16 when the number of cores increases. The different colored yarns in this solution allow construction personnel to quickly separate different optical fibers according to the color line 14, greatly improving the welding efficiency of optical fiber bundles 16 with super large cores.

[0028] like Figure 1, Figure 2 As shown, in order to reduce the friction when the optical cable is laid by air blowing to the external pipeline, a convex strip 5 is arranged on the outer wall of the outer sheath 3, and the height direction of the convex strip 5 extends outward along the radial direction of the optical cable, and the length direction of the convex strip 5 extends along the axial direction of the air-blown optical cable, and spirally surrounds the outer surface of the outer sheath 3. If the convex strip 5 is not spirally arranged, the air-blowing laying effect is not good. In order to ensure the air-blowing laying of the optical cable when entering the external pipeline, the convex strip 5 is spirally wrapped around the surface of the outer sheath, and the pitch of the spiral convex strip 5 is set to be less than or equal to 0.5m. When the pitch is greater than 0.5m, the efficiency of air-blowing laying is not good. Further, when the pitch of the spiral convex strip 5 is set to 0.01-0.5m, there is only one convex strip 5 on any radial surface of the optical cable, and the air-blowing effect is better.

[0029] The outer sheath 3 is provided with protruding ridges 5 , which are arranged on the outer surface of the entire optical cable. The provision of the ridges 5 can reduce the friction between the optical cable and the sheath when the optical cable is laid, thereby improving the laying efficiency.

[0030] Providing the convex strips 5 can reduce the contact area between the optical cable and the external pipe, thereby reducing the friction in the pipe and adapting to the air blowing application. The principle is that if the complete outer sheath 3 surface contacts the pipe, it is difficult to avoid the uneven surface of the outer sheath 3 at the microscopic level. The increase in the roughness of the outer sheath 3 surface will bring greater friction. After the friction convex points are provided, the surface contact is transformed into linear contact, and the points where friction can be generated are greatly reduced. At the same time, during the air blowing process, the friction surface of the airflow on the optical cable can also be increased, which is conducive to the airflow to lift the optical cable in the pipe, reduce the interface pressure, and reduce friction.

[0031] like Figure 5 As shown in the figure, when the optical cable is laid by air blowing, the gas moves along the spiral direction of the convex strip, generating a thrust component on the optical cable in the axial direction, pushing the optical cable into the external pipe. No matter how large the thrust is, as long as there is enough time, the optical cable can be laid in the pipe. However, when the thrust is small, it is time-consuming and labor-intensive to lay the optical cable, and the laying effect is not good. In order to ensure the efficiency of air blowing laying, the thrust component pushes the driving force F of the optical cable to move per meter. f Set to greater than 50N, when the optical cable is set to 1 meter, the driving force F f Greater than 50N, when the optical cable is set to 5 meters, the driving force F f Greater than 250N, when the optical cable is set to 10 meters, the driving force F f Greater than 500N, and so on.

[0032] When the driving force on each meter of optical cable is greater than 50N, the laying speed of the optical cable is fast and the laying effect is good. f The calculation formula is: ; in: ; ; ; F f During the air blowing process, the driving force generated by the friction between the cable and the gas along the moving direction of the cable is applied to the optical cable of a specific length, that is, the driving force applied to the cable. The larger the value, the more conducive it is to improving the air blowing effect of the cable. However, this value is limited by the processing technology, pipeline size, and other physical properties of the cable, and cannot be increased indefinitely. S is the total length of the starting point of the convex strip 5 after it is expanded along the circumference of the optical cable. Under air blowing conditions, the convex length in the optical cable that can be used to increase contact with high-pressure air; is the composite friction multiplier. Under the given outer sheath 3 material and spiral direction, the friction force of the cable pushed by the air in the axial direction is a function defined by the friction coefficient of the specific outer sheath 3 material and the acute angle θ of the spiral ridge 5 to the axial direction of the cable. μ is the dynamic friction coefficient of the given outer sheath 3 material under this working condition. When the outer sheath 3 material is determined, the final calculation result is Can be converted into a function of pitch p; r is the radius of the cable sheath; p is the pitch, which represents the distance between the two closest spiral ridges 5 on any plane passing through the geometric center of the optical cable; L is the total length of the optical cable; θ is the angle between the spiral convex strip 5 and the axial direction of the optical cable; μ is the dynamic friction coefficient of the given outer sheath 3 material under this working condition; P P is the internal pressure of the pipe under the given air blowing equipment and pipeline, and the air blowing process is regarded as a process with constant internal pressure of the pipe; h is the height of the ridge 5 .

[0033] The detailed calculation steps are: The length of the spiral rib within one pitch is: s 2 =2πr 2 +p 2 , So, s= , The length of a section of optical cable is L. There are n pitches in a section of optical cable, so when the length of the optical cable is L, n= , Therefore, in a section of optical cable with a length of L, the total length of the protrusion is: S = s·n, Furthermore, , Furthermore, , Furthermore, , In traditional research, if you want to control the driving force of the optical cable during the air-blowing laying process, you need to add additional equipment and conduct multiple tests, and it involves multiple variables. Every time you add or modify a parameter (such as convex strip height, convex strip width, convex strip shape, sheath material, etc.), you need to re-sample. This is time-consuming and labor-intensive, and most of the samples produced can only be scrapped in the end.

[0034] Now, with the mathematical calculation of quantitative formulas, we only need to fix specific parameters according to product requirements, and then we can directly deduce the most suitable production parameters according to the formula. We only need to conduct sample preparation and testing on a few parameters within a reasonable range to get the optimal solution, which can greatly reduce costs, reduce waste and improve work efficiency.

[0035] For the convenience of calculation, the parameters of the test samples are as follows: The radius r of the outer sheath 3 of the optical cable is 0.1m, the total length L of the optical cable is 1m, the dynamic friction system μ is 0.5, the height h of the convex strip 5 is 0.1mm, and the pressure inside the tube P P Take 1013250pa (10 standard atmospheres).

[0036] After calculation, the following table is obtained

[0037] In this solution, when the height of the convex strip 5 is 0.1, F f The air blowing efficiency that this scheme wants to achieve can only be achieved when it is maintained above 50N. Therefore, in the last set of data in the table, when the pitch P is set to 1m and the height h of the convex strip 5 is set to 0.1mm, the driving force F f Less than 50N, so the desired effect of this solution cannot be achieved and is not feasible.

[0038] The larger the driving force is set, the better. However, when the driving force is too large, the pitch of the spiral ridge 5 is smaller. However, if the pitch of the spiral ridge 5 is too small, it cannot be produced. Therefore, in order to achieve the best laying effect of the air-blown optical cable, the driving force per meter of optical cable is greater than 50N, and the pitch of the spiral ridge 5 is set to be less than or equal to 0.5m. Further, when the pitch of the spiral ridge 5 is set to 0.01-0.5m, there is only one protrusion on any radial surface of the optical cable, and the air-blowing effect is better.

[0039] On any radial surface of the air-blown optical cable, the shape of the convex strip 5 is an arc or a trapezoid. When the cross-sectional shape of the convex strip 5 is set to a trapezoid, the closer to the outer sheath 3, the larger the size of the convex strip 5 is, so as to ensure the air-blowing effect. The shape of the convex strip 5 is often an arc or a trapezoid, and can also be set to other shapes, as long as it can pass through the sizing die. However, setting it to other shapes may cause problems such as deformation. For example, a triangle, due to its pointed head, will cause scratches and depressions after entering the sizing die. If it is a square or a rectangle, due to the 90° angles on both sides, it is very easy to cause scratches, and finally the convex strip 5 is smoothed. At the same time, when the optical cable is laid to the external pipeline, the air-blowing effect is best when the shape of the convex strip 5 is set to an arc or a trapezoid.

[0040]

[0041] In order to enhance the strength of the optical cable, a reinforcement member 4 is arranged in the outer sheath 3, and the reinforcement member 4 is evenly arranged in the outer sheath 3 in the circumferential direction. Since the reinforcement member 4 is laid out in a circular manner, the existing reinforcement member 4 makes the bending performance of the optical cable poor. After the production is completed and the winding is bent, it is often easy to produce plastic deformation or flexible deformation, and it is easy to twist itself during the air blowing process. In order to further ensure the bending performance of the optical cable, in this solution, the reinforcement member 4 is set to an aramid fiber rod or a glass fiber rod, the size of the reinforcement member 4 is between 0.3mm-0.6mm, and the number is set to 8-16 evenly distributed around the outer sheath 3.

[0042] The outer sheath 3 is made of low-friction medium-density polyethylene material, which has good low-temperature resistance and stable chemical properties.

[0043] In this solution, the rigidity range of the optical cable is set to 0.45-0.85N·m 2 The average value of the pipeline friction force of the optical cable is set to between 90N and 150N, and the maximum value of the pipeline friction force of the optical cable is set to between 100N and 200N.

[0044] The present invention solves the defects existing in the background technology and has the following beneficial effects: a convex strip 5 is arranged on the outer side of the outer sheath 3 to reduce the friction between the optical cable and the outer pipeline during the laying, thereby ensuring the completion of the laying of the air-blown optical cable; at the same time, the driving force F of the gas to push the optical cable to move is controlled. f When the driving force of the optical cable is greater than 50N per meter, the pitch of the spiral rib 5 is set to be less than or equal to 0.5m to ensure the efficiency of the optical cable laying.

[0045] The above is based on the ideal embodiment of the present invention. Through the above description, relevant personnel can make various changes and modifications without departing from the technical concept of the present invention. The technical scope of the present invention is not limited to the content in the specification, and the technical scope must be determined according to the scope of the claims.

[0046] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0047] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0048] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. An air-blown optical cable, characterized in that: The invention comprises a cable core (1) and an outer sheath (3) covering the cable core (1); a convex strip (5) is arranged on the outer wall of the outer sheath (3); the height direction of the convex strip (5) extends outward along the radial direction of the optical cable; the length direction of the convex strip (5) extends along the axial direction of the air-blown optical cable and spirally surrounds the outer surface of the outer sheath (3); the gas advances along the spiral direction of the convex strip (5), and generates a thrust component on the optical cable in the axial direction; the thrust component pushes the optical cable to move per meter with a thrust force F f Greater than 50N, driving force F f The calculation formula is: ； in: ； ； ； F f The radial driving force exerted on the optical cable during the air blowing process; S is the total length of the starting point of the convex strip (5) after it is unfolded along the circumference of the optical cable; is the compound friction multiplier; r is the radius of the cable sheath; p is the pitch; L is the total length of the optical cable; θ is the acute angle between the spiral convex strip (5) and the axial direction of the optical cable; P P is the pressure inside the pipe under the given air blowing equipment and pipeline; h is the height of the convex strip (5).

2. The air-blown optical cable according to claim 1, characterized in that: The pitch of the spiral ridges (5) is set to be less than or equal to 0.5 m.

3. The air-blown optical cable according to claim 2, characterized in that: The pitch of the spiral convex strips (5) is set to 0.01-0.5m.

4. The air-blown optical cable according to claim 1, characterized in that: On any radial surface of the air-blown optical cable, the cross-section of the convex strip (5) is arc-shaped or trapezoidal; when the cross-section of the convex strip (5) is set to be trapezoidal, the closer to the outer sheath (3), the larger the cross-section size of the convex strip (5).

5. The air-blown optical cable according to claim 1, characterized in that: A reinforcing member (4) is arranged inside the outer sheath (3), and the reinforcing member (4) is evenly arranged in the circumferential direction inside the outer sheath (3).

6. The air-blown optical cable according to claim 5, characterized in that: The reinforcement member (4) is configured as an aramid fiber rod or a glass fiber rod.

7. The air-blown optical cable according to claim 1, characterized in that: The outer sheath (3) is made of polyethylene material.

8. The air-blown optical cable according to claim 1, characterized in that: The cable core (1) comprises a plurality of optical fibers (11) and a bonding portion (12) for bonding the plurality of optical fibers (11) discontinuously in the axial direction. Two color wires (14) are arranged outside the plurality of optical fibers (11). The two color wires (14) are wound forwards and reversely to bundle the plurality of optical fibers (11) into a bundle.

9. The air-blown optical cable according to claim 8, characterized in that: Any bonding portion on any optical fiber is a first reference bonding portion, the adjacent bonding portion on the optical fiber adjacent to the first reference bonding portion is a second reference bonding portion, and the adjacent bonding portion on the optical fiber adjacent to the second reference bonding portion is a third reference bonding portion, and the first reference bonding portion, the second reference bonding portion and the third reference bonding portion are on the same straight line.

10. The air-blown optical cable according to claim 1, characterized in that: The rigidity of the air-blown optical cable is set to 0.45-1.85N·m 2 .

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