Anti-interference urban communication cable

Abstract

The utility model relates to the technical field of communication cables, in particular to an anti-interference urban communication cable, which comprises a cable core, an electromagnetic shielding layer, a waterproof filling layer, a tensile reinforcing layer and an outer sheath which are sequentially arranged from inside to outside, the electromagnetic shielding layer comprises a copper strip shielding layer on the inner side and an aluminum foil shielding layer on the outer side, and an insulating isolation layer is arranged between the copper strip shielding layer and the aluminum foil shielding layer; the flame-retardant modified PVC / ZnO composite material is used for an outer sheath of a high-voltage cable, has an excellent flame-retardant effect and can reduce the fire risk; the electromagnetic shielding layer comprises a copper strip shielding layer on the inner side and an aluminum foil shielding layer on the outer side, and an insulating isolation layer is arranged between the copper strip shielding layer and the aluminum foil shielding layer; the inner copper strip shielding layer and the outer aluminum foil shielding layer are combined through the insulation isolation layer, a 360-degree three-dimensional shielding system is formed, and the anti-electromagnetic interference capability is improved.

Description

Technical Field

[0001] This utility model relates to the field of communication cable technology, and in particular to an anti-interference urban communication cable. Background Technology

[0002] Cables are typically made up of several or groups of conductors twisted together, resembling a rope. Each group of conductors is insulated from the others, and after the conductors are joined together, the outer surface is covered with one or more protective sheaths to prevent leakage and accidents during use.

[0003] Cables are usually laid underground, where they are easily corroded by various substances and impacted by external forces, damaging both the inner and outer layers of the cable. They are also subject to interference from various electromagnetic waves, which can easily cause signal problems. Utility Model Content

[0004] The purpose of this invention is to provide an anti-interference urban communication cable that addresses the shortcomings of existing technologies.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] An anti-interference urban communication cable includes, from the inside out, a cable core, an electromagnetic shielding layer, a waterproof filling layer, a tensile reinforcing layer, and an outer sheath made of polyvinyl chloride and nano zinc oxide composite. The electromagnetic shielding layer includes an inner copper strip shielding layer and an outer aluminum foil shielding layer, and an insulating isolation layer is provided between the copper strip shielding layer and the aluminum foil shielding layer.

[0007] The outer sheath is provided with rolling structures at intervals along its length. The rolling structure includes an outer ring groove formed inward in the protective sheath. A guide sleeve is fitted on the outer ring groove. Multiple concave rolling grooves are formed in an annular shape at equal intervals on the outer ring of the guide sleeve. Guide rollers are installed in the rolling grooves, and a portion of the guide rollers is exposed outside the rolling grooves.

[0008] Furthermore: the cable core includes a protective sleeve, inside which multiple insulated wires are arranged, and the outer surface of the insulated wires is coated with a nanoscale graphene conductive coating.

[0009] Furthermore: A filler wire is provided inside the protective sleeve, and the filler wire is placed between two adjacent insulated wires, with the outer ring wall of the filler wire contacting the outer ring wall of the two adjacent insulated wires respectively.

[0010] Furthermore: the waterproof filler layer is a structure in which water-swellable rubber strips and silane cross-linked polyethylene composite material layers are alternately wrapped.

[0011] Furthermore: the tensile reinforcement layer includes aramid fiber bundles uniformly distributed along the cable axis, and the aramid fiber bundles are wrapped with glass fiber reinforced epoxy resin sleeves.

[0012] Furthermore, the outer surface of the aluminum foil shielding layer is coated with a conductive polymer anti-corrosion coating with a thickness of 0.1-0.3mm.

[0013] Furthermore, the cable core is equipped with a Kevlar reinforcement core, which contains a fiber optic temperature sensor.

[0014] Furthermore: the outer surface of the outer sheath is provided with a fluorescent identification strip, and an RFID electronic tag is embedded in the fluorescent identification strip.

[0015] Furthermore: the rolling groove is radially formed in the guide sleeve with a concave indentation, and roller grooves are formed on both sides of the rolling groove. A guide roller is installed between the two roller grooves, and the guide roller is sleeved on the guide roller.

[0016] Furthermore, a roller seat is slidably mounted in the roller groove. The roller seat can move along the roller groove. A compression spring is installed in the roller groove. The compression spring is connected to the roller seat. The compression spring can elastically drive the guide roller to pop out radially.

[0017] The beneficial effects of this utility model are as follows: the flame-retardant modified PVC / ZnO composite material used for the outer sheath of high-voltage cables has excellent flame-retardant effect and can reduce the risk of fire; the electromagnetic shielding layer includes an inner copper strip shielding layer and an outer aluminum foil shielding layer, with an insulating isolation layer between the copper strip shielding layer and the aluminum foil shielding layer; the inner copper strip shielding layer and the outer aluminum foil shielding layer are combined and bonded through the insulating isolation layer to form a 360° three-dimensional shielding system, which improves the ability to resist electromagnetic interference. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] Figure 2 This is a schematic diagram of the cross-sectional structure of a city communication cable.

[0020] Figure 3 This is a partial cross-sectional view of a city communication cable.

[0021] Figure 4 This is a cross-sectional structural diagram of the guide sleeve.

[0022] The reference numerals in the figures include:

[0023] 1-Outer sheath,

[0024] 11-Tensile reinforcing layer, 12-Aramid fiber bundle, 13-Glass fiber reinforced epoxy resin sleeve,

[0025] 14-Waterproof filler layer, 15-Water-swellable rubber strip, 16-Silane cross-linked polyethylene composite layer, 17-Fluorescent marking tape, 18-RFID electronic tag.

[0026] 2-Electromagnetic shielding layer,

[0027] 21-Copper tape shielding layer, 22-Aluminum foil shielding layer, 23-Insulating isolation layer,

[0028] 24-Conductive polymer anti-corrosion coating; 25-Cable core; 26-Protective sheath; 27-Insulated wire.

[0029] 28-Nanoscale graphene conductive coating, 29-filled lines

[0030] 291 - Kevlar reinforced core, 292 - Fiber optic temperature sensor

[0031] 3-Rolling structure,

[0032] 31-Outer ring groove, 32-Guide sleeve, 33-Rolling groove, 34-Roller groove, 35-Roller seat,

[0033] 36 - Compression spring, 37 - Guide roller, 38 - Guide wheel. Detailed Implementation

[0034] The present invention will now be described in detail with reference to the accompanying drawings.

[0035] like Figure 1-4 As shown, an anti-interference urban communication cable includes, from the inside out, a cable core 25, an electromagnetic shielding layer 2, a waterproof filling layer 14, a tensile reinforcing layer 11, and an outer sheath 1 made of polyvinyl chloride and nano zinc oxide composite. The flame-retardant modified PVC / ZnO composite material used for the outer sheath 1 of the high-voltage cable has excellent flame-retardant properties, reducing the risk of fire. The electromagnetic shielding layer 2 includes an inner copper strip shielding layer 21 and an outer aluminum foil shielding layer 22, with an insulating layer 23 between the copper strip shielding layer 21 and the aluminum foil shielding layer 22. The inner copper strip shielding layer 21 and the outer aluminum foil shielding layer 22 are combined and connected by the insulating layer 23 to form a 360° three-dimensional shielding system, improving the anti-electromagnetic interference capability.

[0036] Preferably, the cable core 25 includes a protective sleeve 26, within which multiple insulated wires 27 are arranged. The outer surface of the insulated wires 27 is coated with a nano-scale graphene conductive coating 28. The multiple insulated wires 27 can be arranged in a twisted pair or coaxial cable configuration, and the outer coating of nano-scale graphene conductive coating improves conductivity and corrosion resistance.

[0037] Preferably, a filler line 29 is provided inside the protective sleeve 26. The filler line 29 is disposed between two adjacent insulated wires 27, and the outer ring wall of the filler line 29 contacts the outer ring wall of the two adjacent insulated wires 27 respectively. After the three insulated wires 27 are arranged, there is a gap in the protective sleeve 26, and the insulated wires 27 are easy to shift. The filler line 29 of this solution can position the insulated wires 27 against each other, satisfy the filling effect, and reduce the probability of the insulated wires 27 shifting.

[0038] Preferably, the cable core 25 has a Kevlar reinforcing core 291 with a built-in fiber optic temperature sensor 292 at its center. The Kevlar reinforcing core 291 has a hollow cavity. The fiber optic temperature sensor 292 is built into the cavity of the Kevlar reinforcing core 291 at the center of the cable core 25 to monitor the cable temperature in real time.

[0039] Preferably, the waterproof filler layer 14 is a structure in which water-swellable rubber strips 15 and silane cross-linked polyethylene composite material layers 16 are alternately wound; the alternating winding of water-swellable rubber strips 15 and silane cross-linked polyethylene achieves dynamic waterproofing. This results in a water absorption rate of the waterproof filler layer 14 of <0.5% and an ultraviolet aging resistance life of the outer sheath 1 of >15 years.

[0040] Preferably, the tensile reinforcing layer 11 includes aramid fiber bundles 12 uniformly distributed along the cable axis, and the aramid fiber bundles 12 are wrapped with glass fiber reinforced epoxy resin sleeves 13. In this embodiment, the use of aramid fiber bundles 12 in combination with glass fiber reinforced epoxy resin sleeves 13 improves the overall tensile strength, with an axial tensile strength ≥500MPa.

[0041] The outer surface of the aluminum foil shielding layer 22 is coated with a conductive polymer anti-corrosion coating 24 with a thickness of 0.1-0.3 mm. Through a special chemical structure and mechanism of action, a protective layer is formed on the metal surface, which effectively slows down the corrosion process and thus extends the service life of the electromagnetic shielding layer 2.

[0042] Preferably, the fiber optic temperature sensor 292 can be connected to the distributed fiber optic temperature measurement system (DTS) signal. The fiber optic temperature sensor 292 sends a pulse signal to the distributed fiber optic temperature measurement system (DTS). By utilizing the propagation time difference (Δt) of the light pulse in the optical fiber, combined with the speed of light (c) and the refractive index of the optical fiber (n), the location of the temperature anomaly point is determined by the formula L=(c·Δt) / (2n), achieving millimeter-level to meter-level positioning accuracy, thereby realizing rapid fault location and full life cycle management.

[0043] The outer surface of the outer sheath 1 is provided with a fluorescent identification strip 17, and an RFID electronic tag 18 is embedded in the fluorescent identification strip 17. The RFID tag 18 is embedded in the fluorescent strip of the outer sheath 1 through injection molding process, and the working frequency is 860-960MHz.

[0044] The outer sheath 1 has rolling structures 3 arranged at intervals along its length. The rolling structure 3 includes an outer ring groove 31 formed inwardly in the protective sleeve 26. A guide sleeve 32 is fitted on the outer ring groove 31. Multiple inwardly recessed rolling grooves 33 are formed in an annular shape at equal intervals on the outer ring of the guide sleeve 32. A guide roller 38 is installed in the rolling groove 33. A part of the guide roller 38 is exposed outside the rolling groove 33.

[0045] When laying cables in underground passages, the rolling structure 3 of the outer sheath 1 can roll and cooperate with the ground, and the guide roller 38 installed in the rolling groove 33 can roll and cooperate with the ground. During the laying and dragging process, the friction is reduced, which can save workers a lot of effort and improve the laying efficiency.

[0046] Furthermore, the rolling groove 33 is radially formed concavely in the guide sleeve 32, and roller grooves 34 are formed on both sides of the rolling groove 33. A guide roller 37 is installed between the two roller grooves 34, and a guide roller 38 is sleeved on the guide roller 37. The guide roller 38 can rotate in the guide roller 37, thereby realizing the rotation of the guide roller 38.

[0047] Furthermore, a roller seat 35 is slidably mounted on the roller groove 34. The roller seat 35 can move along the roller groove 34. A compression spring 36 is installed in the roller groove 34 and is connected to the roller seat 35. The compression spring 36 can elastically drive the guide roller 38 to pop out radially. The compression spring 36 can drive the roller seat 35 to pop outward. When encountering uneven areas, the compression spring 36 can move the roller seat 35 along the length direction of the roller groove 34 according to the actual contact uneven surface. The guide roller 38 installed on the guide roller 37 maintains rolling contact with the wall of the underground passage.

[0048] In addition, a limiting seat is provided at the outer end of the roller groove 34. The limiting seat can stop the roller seat 35 to prevent the roller seat 35 from disengaging from the roller groove 34 and ensure the rolling stability of the guide roller 38.

[0049] In summary, this utility model possesses the aforementioned excellent characteristics, enabling it to achieve unprecedented efficiency in use and thus become a highly practical product.

[0050] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. An anti-interference type urban communication cable, characterized in that: The cable core, the electromagnetic shielding layer, the waterproof filling layer, the tensile strength reinforcing layer and the outer sheath made of polyvinyl chloride and nano zinc oxide are sequentially arranged from inside to outside. The outer sheath is provided with rolling structures at intervals along the length direction, and the rolling structure comprises an inner recess formed on the outer ring groove of the protective sleeve, an outer ring of the guide sleeve is annularly and equidistantly formed with a plurality of inner recessed rolling grooves, a guide roller is installed in the rolling groove, and a part of the guide roller is exposed outside the rolling groove.

2. The anti-interference type urban communication cable according to claim 1, characterized in that: The cable core comprises a protective sleeve, and a plurality of insulated conductive wires are arranged in the protective sleeve.

3. The anti-interference type urban communication cable according to claim 2, characterized in that: The protective sleeve is provided with a filling wire between the two adjacent insulated conductive wires, and the outer ring wall of the filling wire is in contact with the outer ring wall of the two adjacent insulated conductive wires.

4. The anti-interference type urban communication cable according to claim 3, characterized in that: The waterproof filling layer is an alternating winding structure of an expanded rubber strip and a silane cross-linked polyethylene composite material layer.

5. The anti-interference type urban communication cable according to claim 4, characterized in that: The tensile strength reinforcing layer comprises aramid fiber bundles uniformly distributed along the axial direction of the cable, and the aramid fiber bundles are wrapped with glass fiber reinforced epoxy resin sleeves.

6. The anti-interference type urban communication cable according to claim 5, characterized in that: The outer surface of the aluminum foil shielding layer is coated with a conductive polymer corrosion-resistant coating with a thickness of 0.1-0.3mm.

7. The anti-interference type urban communication cable according to claim 6, characterized in that: The cable core is provided with a Kevlar reinforced core, and the Kevlar reinforced core is provided with an optical fiber temperature measurement sensor.

8. The anti-interference type urban communication cable according to claim 7, characterized in that: The outer surface of the outer sheath is provided with a fluorescent identification band, and the fluorescent identification band is embedded with an RFID electronic tag.

9. The anti-interference type urban communication cable according to claim 1, characterized in that: The rolling groove is recessed and radially formed in the guide sleeve, and the two side walls of the rolling groove are respectively formed with rolling shaft grooves, and a guide roller is installed between the two rolling shaft grooves.

10. The anti-interference type urban communication cable according to claim 9, characterized in that: The rolling shaft groove is also provided with a rolling shaft seat which can move along the rolling shaft groove, and a compression spring is installed in the rolling shaft groove and connected with the rolling shaft seat, and the compression spring can elastically drive the guide roller to pop out radially outward.

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