A communication bundle optical cable

Abstract

The present application relates to the technical field of optical cable communication, and particularly relates to a bundled optical cable for communication, which comprises an inner cable core, a power cable layer, an inner lining layer and a sheath layer, the inner cable core comprises a split center support body, an optical fiber unit and a control cable, the split center support body does not comprise a center hard support core and a peripheral elastic rubber layer, the two form a plurality of elastic self-closing accommodating cavities for fixing the optical fiber unit and the control cable, the peripheral elastic rubber layer is provided with a plurality of circumferentially distributed hollow heat insulation cavities between the accommodating cavities and the power cable layer, forming a closed annular heat insulation barrier, the annularly distributed hollow heat insulation cavities utilize the extremely low thermal conductivity of air to block the heat generated by the outer power cable from being conducted inward, thereby prolonging the service life of the optical cable, and the hollow cavities have elastic buffering functions to absorb external extrusion, bending and impact stress, thereby protecting the internal optical fiber and control cable from being damaged and improving construction reliability.

Description

Technical Field

[0001] This invention relates to the field of optical cable communication technology, and specifically to a bundled optical cable for communication. Background Technology

[0002] With the rapid development of 5G base stations, industrial internet, smart utility tunnels and other fields, bundled optical fiber composite cables have become core products for communication infrastructure construction because they can simultaneously transmit communication signals and power remote equipment. At present, most mainstream bundled optical cables adopt a double-layer concentric circle arrangement structure. The inner layer is formed by the mixing and twisting of optical fiber units and control cables to form the inner cable core, while the outer layer is surrounded by multiple power cables, and a solid reinforcing member of a single material is set in the center to provide tensile support.

[0003] However, the existing structure has the following drawbacks: On the one hand, the heat generated by the outer power cable during operation is directly conducted to the fiber optic unit and control cable through the solid contact, resulting in increased fiber optic transmission loss and accelerated aging of the insulation layer of the control cable. Especially in high-power long-distance power supply scenarios, this problem will significantly shorten the service life of the optical cable. On the other hand, the shape of the inner cable core is entirely dependent on the surrounding constraint of the outer power cable. When it is necessary to strip the outer power cable for branch wiring during construction, the inner cable core will become loose, twisted, and eccentrically deformed due to the loss of external constraint, which can easily cause fiber breakage or signal interruption.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the general background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] This invention provides a bundled optical cable for communication, thereby effectively solving the problems pointed out in the background art.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A bundled optical cable for communication includes: an inner cable core, a power cable layer surrounding the outer side of the inner cable core, and an inner liner layer and a sheath layer sequentially disposed outside the power cable layer. The inner cable core includes a split central support, an optical fiber unit, and a control cable. The split central support includes a central rigid support core and an outer elastic rubber layer disposed on the outside of the central rigid support core. The outer peripheral surface of the central rigid support core and the inner peripheral surface of the outer elastic rubber layer together form multiple elastic self-closing cavities, and the optical fiber unit and the control cable are disposed in the elastic self-closing cavities. The outer elastic rubber layer is also provided with multiple hollow heat insulation cavities. These multiple hollow heat insulation cavities are distributed circumferentially along the split central support and are located between the elastic self-closing accommodating cavity and the power cable layer, forming a closed annular heat insulation barrier.

[0007] Furthermore, each of the aforementioned elastic self-closing cavities has an open end facing outwards from the split central support body; The optical fiber unit and the control cable are embedded in the elastic self-closing cavity through the open end, and are limited by the elastic reset of the outer elastic rubber layer at the open end.

[0008] Furthermore, the open end is a cut seam formed by cutting the outer elastic rubber layer after pultrusion molding.

[0009] Furthermore, the central rigid support core and the outer elastic rubber layer are continuously formed by a dual-machine co-extrusion process, and the outer elastic rubber layer is fused together with the central rigid support core.

[0010] Furthermore, an interlocking structure is axially and continuously provided between the outer peripheral surface of the central rigid support core and the outer elastic rubber layer. The interlocking structure is used to enhance the bonding strength between the central rigid support core and the outer elastic rubber layer and prevent relative sliding or peeling between the two.

[0011] Furthermore, the central rigid support core is made of glass fiber reinforced plastic pultrusion molding; The outer elastic rubber layer is made of thermoplastic elastomer with a Shore hardness of A50-A70.

[0012] Furthermore, the optical fiber unit and the control cable are independently distributed in different elastic self-closing cavities, or the optical fiber unit and the control cable are jointly distributed in the same elastic self-closing cavity.

[0013] Furthermore, the power cable layer includes multiple independently insulated power cables, which are evenly distributed along the circumference of the inner core and are disposed close to the inner side of the inner liner layer.

[0014] Furthermore, the inner lining layer is an easily peelable inner lining layer, and the inner lining layer and the power cable layer are loosely bonded without adhesive.

[0015] Furthermore, when the porosity between power cables is greater than 10%, the power cable layer is filled with high-temperature resistant and flame-retardant glass fiber filler rope. When the porosity is ≤10%, there is no filling material in the power cable layer.

[0016] The technical solution of this invention can achieve the following technical effects: The hollow insulation cavity forms a closed thermal barrier on the outside of the elastic self-closing cavity. The annularly distributed hollow insulation cavity utilizes the extremely low thermal conductivity of air to block the heat generated by the outer power cable from being conducted inward. This solves the problems of increased fiber optic transmission loss and aging insulation of control cables under high-power power supply conditions, thus extending the service life of the optical cable. At the same time, the hollow cavity has an elastic buffer function, which can absorb external extrusion, bending and impact stress, protecting the internal optical fiber and control line from damage.

[0017] When branch cabling is required, the inner lining layer and power cable layer of a specified length can be directly stripped. The split central support body independently limits and fixes the optical fiber and control line through the elastic self-closing cavity, so that the inner cable core forms an integrated self-stabilizing whole, completely eliminating the structural dependence on the outer power cable. After the outer power cable is stripped, the inner cable core can still maintain a regular circular shape, and the relative position of the cable remains unchanged, without loosening, twisting, or eccentric deformation, which improves the flexibility and reliability of construction. The central rigid support core provides high-strength axial tensile and radial support, while the outer elastic rubber layer provides excellent radial buffering and elastic recovery capabilities, solving the problem that traditional single-material reinforcements cannot balance strength and elasticity. At the same time, the outer elastic rubber layer itself has certain insulation and shielding properties. Combined with the physical isolation of the split structure, it can effectively block the power frequency electromagnetic interference generated by the outer power cables, improving the stability of control signals and fiber optic transmission. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A schematic diagram of a bundled optical cable for communication. Figure 2 A cross-sectional view of a bundled optical cable for communication. Figure 3 A cross-sectional view of the central rigid support core; Figure 4 This is a cross-sectional view of the outer elastic rubber layer; Figure 5 This is a sectional view of the split-type central support structure; Figure 6 This is a schematic diagram of a split-type central support structure; Figure 7 This is a schematic diagram of the inner cable core.

[0020] Reference numerals: 1. Inner cable core; 11. Split-type central support; 111. Central rigid support core; 111a. First receiving concave surface; 112. Outer elastic rubber layer; 112a. Elastic self-closing receiving cavity; 112b. Hollow heat insulation cavity; 112c. Second receiving concave surface; 112d. Open end; 113. Interlocking structure; 12. Optical fiber unit; 13. Control cable; 2. Power cable layer; 21. Insulated power cable; 3. Inner liner layer; 4. Sheath layer. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0023] like Figures 1 to 7 As shown: A bundled optical cable for communication includes: an inner cable core 1, a power cable layer 2 surrounding the outer side of the inner cable core 1, and an inner liner layer 3 and a sheath layer 4 sequentially disposed outside the power cable layer 2. The inner core 1 includes a split central support 11, an optical fiber unit 12, and a control cable 13. The split central support 11 includes a central rigid support core 111 and an outer elastic rubber layer 112 disposed on the outside of the central rigid support core 111. The outer peripheral surface of the central rigid support core 111 and the inner peripheral surface of the outer elastic rubber layer 112 together form multiple elastic self-closing cavities 112a, and the fiber optic unit 12 and the control cable 13 are disposed in the elastic self-closing cavities 112a. The outer elastic rubber layer 112 is also provided with multiple hollow heat insulation cavities 112b. The multiple hollow heat insulation cavities 112b are distributed around the circumference of the split central support 11 and are located between the elastic self-closing receiving cavity 112a and the power cable layer 2, forming a closed annular heat insulation barrier.

[0024] In this embodiment, the split central support 11 does not refer to the support components that are loosely separated after the cable is formed, but rather to a central load-bearing structure formed by a central rigid support core 111 with different functions and materials and an outer elastic rubber layer 112. The central rigid support core 111 is used to bear the axial tensile load of the entire optical cable and provide radial support stiffness. The outer elastic rubber layer 112 covers the radially outer side of the central rigid support core 111 and is used to provide elastic clamping, radial buffering and thermal insulation.

[0025] Specifically, the split-type central support 11 can adopt an axisymmetric structure with a circular cross-section. The central rigid support core 111 is located at the axis, and the outer peripheral surface of the central rigid support core 111 has four first receiving concave surfaces 111a that extend continuously along the axial direction. The inner peripheral surface of the outer elastic rubber layer 112 forms a second receiving concave surface 112c at the corresponding position. The first receiving concave surfaces 111a and the second receiving concave surfaces 112c together enclose four elastic self-closing receiving cavities 112a. The fiber optic unit 12 and the control cable 13 are arranged in the elastic self-closing receiving cavity 112a. Two corresponding outer surfaces are arranged in each elastic self-closing receiving cavity 112a. Eight hollow heat-insulating cavities 112b are formed around the split central support 11. In this embodiment, the number of elastic self-closing accommodating cavities 112a is not limited to four, and the number of hollow heat-insulating cavities 112b is not limited to eight. The number of elastic self-closing accommodating cavities 112a and hollow heat-insulating cavities 112b can be flexibly adjusted according to the diameter of the optical cable and the number of cables. Based on this structure, the optical fiber unit 12 and the control cable 13 no longer rely on the surrounding compression of the external power cable layer 2 to maintain their relative positions, but are directly limited by the split central support 11, thereby making the inner cable core 1 a self-stabilizing whole.

[0026] The hollow heat-insulating cavity 112b forms a closed thermal barrier outside the elastic self-closing receiving cavity 112a. The annularly distributed hollow heat-insulating cavity 112b utilizes the extremely low thermal conductivity of air to block the heat generated by the outer power cable from being conducted inward. This solves the problems of increased optical fiber transmission loss and insulation aging of the control cable 13 under high power supply conditions, thus extending the service life of the optical cable. At the same time, the hollow cavity has an elastic buffer function, which can absorb external extrusion, bending and impact stress, protecting the internal optical fiber and control line from damage.

[0027] When branch cabling is required, the inner lining layer 3 and the power cable layer 2 of a specified length can be directly stripped. The split-type central support 11 independently limits and fixes the optical fiber and control line through the elastic self-closing receiving cavity 112a, making the inner cable core 1 an integrated and self-stabilizing whole. This completely eliminates the structural dependence on the outer power cable. After the outer power cable is stripped, the inner cable core 1 can still maintain a regular circular shape, and the relative position of the cable remains unchanged, without loosening, twisting, or eccentric deformation, thus improving construction flexibility and reliability. Under normal operating conditions, the power cable layer 2 supplies power to the remote equipment, the optical fiber unit 12 transmits communication signals, and the control cable 13 transmits control signals. The hollow heat-insulating cavity 112b blocks the heat generated by the power cables from being conducted inward, while the outer elastic rubber layer 112 absorbs external extrusion, bending, and impact stress, protecting the internal cables from damage. In addition, the central rigid support core 111 provides high-strength axial tensile and radial support, and the outer elastic rubber layer 112 provides excellent radial buffering and elastic recovery capabilities, solving the problem that traditional single-material reinforcements cannot balance strength and elasticity. At the same time, the outer elastic rubber layer itself has certain insulation and shielding properties, which, combined with the physical isolation of the split structure, can effectively block the power frequency electromagnetic interference generated by the outer power cables, improving the stability of control signals and fiber optic transmission.

[0028] The sheath layer 4 is located radially outside the inner liner layer 3 and can be made of polyethylene, low-smoke halogen-free flame-retardant polyolefin, or polyurethane. The polyethylene sheath is suitable for conventional outdoor laying, the low-smoke halogen-free flame-retardant polyolefin sheath is suitable for pipe racks, machine rooms, and densely populated areas, and the polyurethane sheath is suitable for industrial sites with high requirements for wear resistance, oil resistance, or flexibility. The sheath layer 4 is used to resist external wear, moisture intrusion, and environmental aging, and works with the inner liner layer 3 to maintain the overall roundness of the power cable layer 2.

[0029] As a preferred embodiment of the above, each elastic self-closing receiving cavity 112a has an open end 112d facing outward of the split central support 11; The fiber optic unit 12 and the control cable 13 are embedded into the elastic self-closing cavity 112a through the open end 112d, and are limited by the elastic reset of the outer elastic rubber layer 112 at the open end 112d. Specifically, in its natural state, the open end 112d is closed by the elastic lips of the outer elastic rubber layer 112 abutting against each other. When installing the fiber optic unit 12 or the control cable 13, the open end 112d can be temporarily opened by a pressing tool, and the fiber optic unit 12 or the control cable 13 is embedded into the elastic self-closing cavity 112a through the open end 112d. After the external force is removed, the elastic lip closes again by the elastic reset of the outer elastic rubber layer 112, and forms a radial limit on the fiber optic unit 12 or the control cable 13 located in the cavity. Through this self-closing structure, the fiber optic and control cable can be directly embedded into the elastic self-closing cavity 112a without twisting, filling and binding, reducing production steps, significantly improving production efficiency, and reducing the weight and material cost of the optical cable.

[0030] In this embodiment, the open end 112d is a cut slit formed by cutting the outer elastic rubber layer 112 after pultrusion molding. After the outer elastic rubber layer 112 is extruded and cooled, the open end 112d can be formed by four cutters corresponding to the positions of the elastic self-closing cavity 112a. During the transportation of the outer elastic rubber layer, the cutters form a cut slit on the self-closing cavity. The length of the cut slit is consistent with the axial length of the elastic self-closing cavity 112a, and the depth penetrates the outer wall of the outer elastic rubber layer 112 until it communicates with the elastic self-closing cavity 112a. This cutting method does not change the continuous extrusion process of the outer elastic rubber layer, and the edge of the cut slit is neat, fits tightly during elastic reset, and has a reliable limiting effect. It should be noted that this cutting method is only a specific example and does not exclude other methods such as direct molding with a mold. As long as an open slit that can be elastically opened and closed can be formed, it falls within the protection scope of this application.

[0031] In this embodiment, the central rigid support core 111 and the outer elastic rubber layer 112 are continuously formed by a dual-machine co-extrusion process, and the outer elastic rubber layer 112 is fused together with the central rigid support core 111. Specifically, the central rigid support core 111 enters the co-extrusion die as a continuous core material. One forming channel continuously provides the central rigid support core 111, while the other extrusion channel extrudes the molten elastic material and covers the outer circumference of the central rigid support core 111, so that the outer elastic rubber layer 112 and the central rigid support core 111 are fused together. Through this continuous forming method, subsequent assembly errors can be reduced, and the elastic self-closing receiving cavity 112a and the hollow heat insulation cavity 112b can be kept continuous and consistent along the axial direction, which is conducive to the stable production of long-distance optical cables.

[0032] As a preferred embodiment of the above embodiment, an interlocking structure 113 is axially continuously provided between the outer peripheral surface of the central rigid support core 111 and the outer elastic rubber layer 112. The interlocking structure 113 is used to enhance the bonding strength between the central rigid support core 111 and the outer elastic rubber layer 112 and prevent relative sliding or peeling between the two. Specifically, in order to enhance the bonding strength between the central rigid support core 111 and the outer elastic rubber layer 112, an axially continuous interlocking structure 113 can be provided between the outer peripheral surface of the central rigid support core 111 and the outer elastic rubber layer 112. The interlocking structure 113 can adopt a T-groove structure, a dovetail groove structure, or a toothed rib structure, etc. In this embodiment, a T-groove structure is adopted. A T-shaped block extending axially is opened on the outer peripheral surface of the central rigid support core 111. The outer elastic rubber layer 112 fills and covers the T-shaped block during co-extrusion. After cooling and solidification, a mechanical interlock is formed. The above-mentioned interlocking structure 113 is fused together, which can reduce the risk of relative sliding or delamination of the two materials during bending, traction and peeling construction.

[0033] Among them, the central rigid support core 111 is made of glass fiber reinforced plastic pultrusion molding; The outer elastic rubber layer 112 is made of thermoplastic elastomer with a Shore hardness of A50-A70.

[0034] Specifically, the central rigid support core 111 can be made of glass fiber reinforced plastic through pultrusion molding, or, provided that the axial tensile strength and insulation requirements are met, an aramid-reinforced resin core or a high-strength insulating composite core can be used. As a specific implementation, the central rigid support core 111 is made of glass fiber reinforced plastic through pultrusion molding. Glass fiber reinforced plastic is lightweight, has high tensile strength, corrosion resistance, and good insulation properties, which can improve the axial tensile strength without increasing the overall cable's metal conductive path. The outer elastic rubber layer 112 can be made of thermoplastic elastomers, thermoplastic polyurethane elastomers, EPDM rubber, or silicone rubber, etc., which possess elastic recovery capabilities. Materials with good insulation properties; In this embodiment, the outer elastic rubber layer 112 is made of thermoplastic elastomer with a Shore hardness of A50-A70. In actual applications, the appropriate hardness can be selected according to the requirements. When the Shore hardness is lower than A50, the limiting force of the elastic lip on the optical fiber unit 12 or control cable 13 is insufficient, and the cable inside the cavity is prone to shaking during cabling and construction stripping. When the Shore hardness is higher than A70, the external force required to open the open end 112d increases, the elastic reset closing effect decreases, and it may generate excessive clamping pressure on the optical fiber unit 12. Therefore, a Shore hardness of A50-A70 can take into account the ease of installation, clamping stability and radial buffering performance.

[0035] In this embodiment, the optical fiber unit 12 and the control cable 13 are independently distributed in different elastic self-closing cavities 112a, or the optical fiber unit 12 and the control cable 13 are jointly distributed in the same elastic self-closing cavity 112a. Specifically, the distribution of the optical fiber unit 12 and the control cable 13 in the elastic self-closing cavities 112a can be flexibly selected according to actual needs. One specific implementation is that the optical fiber unit 12 and the control cable 13 are independently distributed in different elastic self-closing cavities 112a, that is, only one type of cable is placed in each cavity, which can avoid the electromagnetic interference of the control cable 13 from affecting the optical fiber signal, and at the same time facilitate identification and splicing during construction. Another specific implementation is that the optical fiber unit 12 and the control cable 13 are jointly distributed in the same elastic self-closing cavity 112a, that is, one cavity simultaneously accommodates one optical fiber unit 12 and one control cable 13. This layout can reduce the outer diameter of the optical cable and is suitable for scenarios with limited installation space. Both of the above methods are within the protection scope of this application, and those skilled in the art can choose according to specific communication and power supply requirements, space limitations, and cost considerations.

[0036] As a preferred embodiment of the above, the power cable layer 2 includes multiple independently insulated power cables 21. The multiple independently insulated power cables 21 are evenly distributed around the inner core 1 and are closely attached to the inner side of the inner liner layer 3. Specifically, the independently insulated power cables 21 can be selected with the same cross-sectional specification according to the remote power supply, or different cross-sectional specifications can be set according to the power supply circuit requirements. When the same cross-sectional specification is used, the circumferential stress and heat distribution are more uniform, which is suitable for conventional remote power supply scenarios. When different cross-sectional specifications are used, it can be adapted to multi-circuit power supply or main and backup power supply scenarios. The power cable layer 2 can be arranged in a single loop around the circumference, or it can be arranged in two staggered loops. The single loop around the circumference arrangement is conducive to reducing the outer diameter of the entire cable, while the two staggered loops arrangement can increase the total cross-sectional area of ​​the conductor under higher power supply requirements.

[0037] The inner lining layer 3 is an easily peelable inner lining layer 3, and the inner lining layer 3 and the power cable layer 2 are in a loose, non-adhesive relationship. Specifically, the loose, non-adhesive relationship means that the inner lining layer 3 covers and constrains the power cable layer 2, but the inner wall of the inner lining layer 3 is not fixed to the surface of the independent insulated power cable 21 by adhesives, hot melt bonding, or cross-linking bonding. When branching during construction, after cutting open the sheath layer 4 and the inner lining layer 3, the independent insulated power cable 21 that needs to be branched can be peeled off from the outside of the inner core 1 without causing the inner core 1 to become loose or eccentrically deformed. As an alternative, the inner lining layer 3 is made of high-density polyethylene material with a thickness of 0.3mm-0.5mm. In practical applications, the appropriate thickness can be selected according to the diameter. When the thickness is less than 0.3mm, the inner lining layer 3 is prone to breakage during cable extrusion and construction traction, making it difficult to stably constrain the power cable layer 2. When the thickness is greater than 0.5mm, the peeling resistance and the outer diameter of the entire cable increase, which is not conducive to branch construction and lightweight cabling. Therefore, 0.3mm-0.5mm can balance the binding strength, easy peeling and outer diameter control.

[0038] In this embodiment, when the porosity between power cables is greater than 10%, the power cable layer 2 is filled with high-temperature resistant and flame-retardant glass fiber filler rope. When the porosity is ≤10%, there is no filling material in the power cable layer 2. Specifically, the porosity in the power cable layer 2 refers to the proportion of the void area (excluding the solid cross-sectional area of ​​multiple independent insulated power cables 21) in the cross-section of the power cable layer 2 perpendicular to the axial direction to the outer envelope cross-sectional area of ​​the power cable layer 2. When the porosity between the power cables is greater than 10%, the power cable layer 2 is filled with high-temperature resistant and flame-retardant glass fiber filler rope. The glass fiber filler rope is located in the gap between adjacent independent insulated power cables 21 to support the cross-sectional shape of the power cable layer 2 and improve the flame-retardant performance, and to prevent local depressions or eccentricity during sheath extrusion after cabling. When the porosity is less than or equal to 10%, the power cables already have a relatively tight circumferential contact and cross-sectional support, and no filling material is needed, thereby reducing the weight of the entire cable and the amount of material used, and avoiding the filling material from increasing the peeling resistance.

[0039] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A bundled optical cable for communication, characterized in that, include: The inner cable core, the power cable layer surrounding the outer side of the inner cable core, and the inner liner and sheath layer sequentially disposed on the outer side of the power cable layer; The inner cable core includes a split central support, an optical fiber unit, and a control cable. The split central support includes a central rigid support core and an outer elastic rubber layer disposed on the outside of the central rigid support core. The outer peripheral surface of the central rigid support core and the inner peripheral surface of the outer elastic rubber layer together form multiple elastic self-closing cavities, and the optical fiber unit and the control cable are disposed in the elastic self-closing cavities. The outer elastic rubber layer is also provided with multiple hollow heat insulation cavities. The multiple hollow heat insulation cavities are distributed around the circumference of the split central support and are located between the elastic self-closing receiving cavity and the power cable layer to form a closed annular heat insulation barrier. Each of the aforementioned resilient self-closing cavities has an open end facing outwards from the split central support; The optical fiber unit and the control cable are embedded in the elastic self-closing cavity through the open end, and are limited by the elastic reset of the outer elastic rubber layer at the open end; An interlocking structure is axially and continuously provided between the outer peripheral surface of the central rigid support core and the outer elastic rubber layer. The interlocking structure is used to enhance the bonding strength between the central rigid support core and the outer elastic rubber layer and prevent relative sliding or peeling between the two.

2. The bundled optical cable for communication according to claim 1, characterized in that, The open end is a cut seam formed by cutting the outer elastic rubber layer after pultrusion molding.

3. The bundled optical cable for communication according to claim 1, characterized in that, The central rigid support core and the outer elastic rubber layer are continuously formed by a dual-machine co-extrusion process, and the outer elastic rubber layer is fused together with the central rigid support core.

4. The bundled optical cable for communication according to claim 1, characterized in that, The central rigid support core is made of glass fiber reinforced plastic pultrusion molding. The outer elastic rubber layer is made of thermoplastic elastomer with a Shore hardness of A50-A70.

5. The bundled optical cable for communication according to claim 1, characterized in that, The optical fiber unit and the control cable are independently distributed in different elastic self-closing cavities, or the optical fiber unit and the control cable are jointly distributed in the same elastic self-closing cavity.

6. The bundled optical cable for communication according to claim 1, characterized in that, The power cable layer includes multiple independent insulated power cables, which are evenly distributed along the circumference of the inner core and are closely attached to the inner side of the inner lining layer.

7. The bundled optical cable for communication according to claim 1, characterized in that, The inner lining is an easy-to-peel inner lining, and the inner lining and the power cable layer are loosely bonded.

8. The bundled optical cable for communication according to claim 1, characterized in that, When the porosity between power cables is greater than 10%, the power cable layer is filled with high-temperature resistant and flame-retardant glass fiber filler rope. When the porosity is ≤10%, there is no filling material in the power cable layer.

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