CN222088337U - A low voltage DC control cable for rail transit - Google Patents
A low voltage DC control cable for rail transit Download PDFInfo
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- CN222088337U CN222088337U CN202323523879.1U CN202323523879U CN222088337U CN 222088337 U CN222088337 U CN 222088337U CN 202323523879 U CN202323523879 U CN 202323523879U CN 222088337 U CN222088337 U CN 222088337U
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Abstract
The utility model relates to the technical field of charging pile cables, in particular to a low-voltage direct-current control cable for rail transit, which comprises the following components: the cable comprises an electric cable core, a control cable core, a grounding wire core, a cabling filling layer, a polyester tape wrapping layer, a flexible shielding layer and an outer sheath, wherein the flexible shielding layer is formed by a glass fiber braided wire substrate and a composite wrapped copper wire to form the overall shielding of the control cable. The low-voltage direct current control cable for the rail transit adopts the composite design of the power cable core and the signal cable core, not only realizes signal transmission under the complex underground environment of the rail transit, but also realizes end-to-end weak current power supply, so that the embedded sensor, the edge controller and the edge computing equipment do not need independent power distribution lines, the circuit laying and the interference are reduced, and the current generated by the surface skin effect is introduced into the ground through the grounding design, thereby avoiding the damage to the cable and the tail end equipment. The fireproof layer and the explosion-proof layer are combined on the outer layer of the power wire core, so that the use safety requirement under the underground high-temperature environment is met.
Description
Technical Field
The utility model relates to the technical field of wires and cables, in particular to a control cable, and particularly relates to a low-voltage direct-current control cable for rail transit.
Background
The control cable is a typical cable for transmitting data and signals, and is often used for transmitting control signals, such as a frequency converter, a control system, an instrument and the like, and because of the characteristics of the control signals, the design and performance requirements of the control cable are more strict than those of a power transmission cable, and the control cable is required to have more stable transmission characteristics, electromagnetic interference resistance, long service life and the like. Control cables have been widely used in the fields of industrial automation, robots, numerical control machine tools, transportation, power systems, and the like.
Typical control cables in existing designs employ conductor, insulation, shielding, jacket designs. Conductors are the main part of the cable, usually copper or aluminium as material. Insulation is to isolate electrical contact between conductors and between the conductors and the outside world. The shielding is to prevent the cable from being interfered by external electromagnetic interference or to the external environment, and usually adopts a metal material such as a copper wire, a copper strip or an aluminum-plastic composite strip as a shielding layer. The sheath is to protect the cable from mechanical damage, chemical corrosion and environmental impact, and is usually made of plastic such as polyvinyl chloride or rubber.
The technical background of the low-voltage direct-current control cable for the rail transit can be traced to the beginning of the 20 th century, the rail transit system starts to develop rapidly, and higher requirements are put on the reliability and the safety of the signal transmission and control system. The low voltage dc control cable is constantly optimized and improved in terms of materials, structure and manufacturing process. The conductor material is developed from copper to aluminum and copper alloy conductors, the insulating material is developed from single polyvinyl chloride to polyethylene, rubber and other diversified materials, and the sheath material is also more focused on corrosion resistance and ageing resistance. Meanwhile, the structure and the manufacturing process of the cable are more complicated and fine, so that the requirements of a rail transit system on the aspects of signal transmission speed and stability, electromagnetic interference resistance, high temperature resistance, cold resistance and the like are met.
Disclosure of utility model
According to a first aspect of the object of the present utility model, there is provided a low voltage direct current control cable for rail transit, comprising:
The plurality of power cable cores and the at least one control cable core are arranged in a pairwise manner;
The grounding wire cores are arranged in kerfs formed on the outer sides of the control cable core and the two power cable cores;
A cabling filling layer which is arranged in a gap between the adjacent power cable core and the control cable core, and is wrapped by a polyester tape wrapping layer together with the power cable core, the control cable core and the ground wire core to form a power cable core with a circular cross section;
The flexible shielding layer is wrapped outside the polyester tape wrapping layer, and a substrate formed by glass fiber braided wires and a copper wire compositely wound on the substrate form the overall shielding of the control cable;
The outer sheath is extruded outside the flexible shielding layer;
The power cable core comprises a first conductor, a first conductor insulating layer, a first conductor shielding layer, a fireproof layer, an explosion-proof layer and an inner sheath which are sequentially arranged from inside to outside along the radial direction, wherein the fireproof layer is formed by wrapping a mica tape of a pre-impregnated ceramic fireproof material, and the explosion-proof layer is a nylon wire or glass fiber bundle weaving layer;
The control cable core comprises a control wire core, a wire core filling layer, a wire core wrapping layer and a second conductor insulating layer which are arranged in the radial direction from inside to outside in turn, wherein the plurality of control wire cores are formed by mutually twisting the two control wire cores in a cutting mode, the wire core filling layer is arranged on two sides of the two control wire cores and is wrapped by the wire core wrapping layer together with the two control wire cores to form a control cable core with a circular cross section, the second conductor insulating layer is wrapped on the outer side wall of the wire core wrapping layer, the second conductor insulating layer is made of the same material as the first conductor insulating layer, and the thickness of the first conductor insulating layer is larger than that of the second conductor insulating layer.
As an alternative embodiment, a conductive cloth adhesive tape is further arranged between the flexible shielding layer and the cabling filling layer, and the conductive cloth adhesive tape is wrapped outside the polyester tape wrapping layer.
As an alternative embodiment, the number of the wrapping layers of the conductive cloth adhesive tape is two, and the lap joint rate is 35% -45%.
As an alternative embodiment, the first conductor and the second conductor adopted by the control wire core are both stranded copper conductors, and are formed by stranding galvanized copper wires.
As an optional embodiment, the first conductor shielding layer is a copper wire braided shielding layer, the thickness of the copper wire braided shielding layer is 0.10 mm-0.15 mm, and the braiding angle is 45 degrees.
As an alternative embodiment, the explosion-proof layer is a nylon yarn or glass fiber bundle braiding layer, the thickness of the nylon yarn or glass fiber bundle braiding layer is 0.10 mm-0.2 mm, and the braiding angle is 45-55 degrees.
As an alternative embodiment, the control wire core comprises a second conductor and an insulating shielding layer, the second conductor comprises a plurality of copper conductors stranded with each other, and the insulating shielding layer is extruded on the outer wall of the second conductor;
the insulating shielding layer is a three-layer co-extrusion layer and comprises an inner shielding layer, an insulating layer and an outer shielding layer which are sequentially distributed from inside to outside.
As an alternative embodiment, the ground wire core includes a third conductor and a third insulating layer extruded outside the third conductor, where the second conductor insulating layer, the first conductor insulating layer, and the third insulating layer are all polyvinyl chloride or crosslinked polyethylene insulating layers.
As an alternative embodiment, the total thickness of the flexible shielding layer is controlled to be 1 mm-1.5 mm.
As an alternative embodiment, the outer sheath adopts a polyethylene sheath layer or a polyvinyl chloride sheath layer, and the thickness is 1.5 mm-2 mm.
Compared with the prior art, the low-voltage direct-current control cable for the rail transit provided by the utility model adopts the composite structure design of the power cable core and the signal cable core, and not only realizes signal transmission, but also realizes end-to-end weak current power supply under the complex underground environment of the rail transit, so that the embedded sensor, the edge controller and the edge computing equipment do not need independent power distribution lines, the laying and the interference on a circuit are reduced, and meanwhile, the current generated by the surface skin effect is led into the ground through the grounding design, so that the damage to the cable and the tail end equipment is effectively reduced and avoided. Meanwhile, the fireproof layer and the explosion-proof layer are designed on the outer layer of the power wire core, so that the use safety requirement under the underground high-temperature environment is met.
The low-voltage direct current control cable for track traffic adopts a mode of combining an inner shielding layer and an overall shielding layer, wherein three layers of co-extruded insulating shielding layers are designed outside conductors of an inner control wire core, an inner power cable core adopts a copper wire braided shielding layer to realize inner wire core level shielding, after the cable is wrapped, an electric conductive cloth adhesive tape is used for carrying out overall shielding, the cable core is tightly wrapped into a cable, contact resistance is small and stable, electric lap joint and electric sealing of gaps are realized, and then the overall shielding of the control cable is realized through a substrate formed by glass fiber braided wires and copper wires which are compositely wound on the substrate, so that electromagnetic shielding is realized, and the cable is prevented from being subjected to external electromagnetic interference and interference to the outside.
Drawings
The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of various aspects of the utility model will now be described, by way of example, with reference to the accompanying drawings, in which:
fig. 1 is a schematic structural diagram of a low-voltage dc control cable for rail transit according to an embodiment of the present utility model;
fig. 2 is a schematic diagram of a power cable core structure of a low-voltage dc control cable for rail transit according to an embodiment of the present utility model;
Fig. 3 is a schematic diagram of a control cable core structure of a low-voltage dc control cable for rail transit according to an embodiment of the present utility model;
fig. 4 is a schematic diagram of a control wire core structure of a low-voltage dc control cable for rail transit according to an embodiment of the present utility model.
Detailed Description
For a better understanding of the technical content of the present utility model, specific examples are set forth below, along with the accompanying drawings.
The low voltage dc control cable for rail transit in connection with the embodiment shown in fig. 1-4 comprises a power cable core 10, a control cable core 20, a ground wire core 30, a cabling filler layer 40, a polyester tape wrap 50, a flexible shielding layer 60, and an outer jacket 70.
The plurality of power cable cores 10 and the at least one control cable core 20 are arranged two by two. In the illustrated example, 2 power cable cores and 2 control cable cores are exemplified for intertwisting.
As shown in fig. 1, at least one ground wire core 30 is provided in a slit formed at the outer sides of the control cable core 20 and the two power cable cores 10.
The cabling filling layer 40 is arranged in a gap between the adjacent power cable core 10 and the control cable core 20, and is wrapped together with the power cable core 10, the control cable core 20 and the ground wire core 30 by the polyester tape wrapping layer 50 to form a power cable core with a circular cross section, and the cable is prevented from being deformed loosely due to bending and torsion by the action of the polyester tape wrapping layer wrapping and fixing.
In an alternative embodiment, the cabling filler layer 40 employs fiberglass strands that provide good flame retardancy and insulation.
The flexible shielding layer 60 is wrapped outside the polyester tape wrapping layer 50, and the substrate formed by glass fiber braided wires and the copper wires compositely wound on the substrate form the overall shielding of the control cable, so that the electromagnetic shielding resistance of the direct current control cable is improved. Wherein the total thickness of the flexible shielding layer 60 is controlled to be 1 mm-1.5 mm.
The outer sheath 70 adopts a polyethylene sheath layer or a polyvinyl chloride sheath layer, has the thickness of 1.5 mm-2 mm, is extruded and wrapped on the outer side of the flexible shielding layer 60, forms the external protection of the rail transit direct current control cable, has the waterproof and dampproof effects, and protects the cable from mechanical damage, chemical corrosion and environmental influence.
The power cable core 10 includes a first conductor 11, a first conductor insulating layer 12, a first conductor shielding layer 13, a fireproof layer 14, an explosion-proof layer 15, and an inner sheath 16, which are disposed in this order from the inside to the outside in the radial direction.
The fire-resistant layer 14 is formed by wrapping a band of a pre-impregnated ceramic fire-resistant material with, for example, ceramic nano-fire-resistant particles that ceramic when heated at high temperatures to form a hard ceramic layer through which further propagation of flames and high temperatures is prevented, thereby improving the fire-resistant time and fire-resistant rating of the material.
The explosion-proof layer 15 is a nylon wire or glass fiber bundle braiding layer, in the embodiment adopting the nylon wire braiding layer or glass fiber bundle braiding layer, the strength of the nylon wire and the glass fiber bundle is higher, the weight is lighter than that of the copper wire, on one hand, the toughness of the cable after cabling is improved, and meanwhile, the whole weight of the cable can be reduced.
The control cable core 20 comprises a control wire core 21, a wire core filling layer 22, a wire core wrapping layer 23 and a second conductor insulating layer 24 which are sequentially arranged from inside to outside along the radial direction, wherein the plurality of control wire cores 21 are formed by twisting the plurality of control wire cores in a pair by pair, the wire core filling layer 22 is arranged on two sides of the two control wire cores 21 and is wrapped by the wire core wrapping layer 23 together with the two control wire cores 21 to form a control cable core with a circular cross section, the second conductor insulating layer 24 is wrapped on the outer side wall of the wire core wrapping layer 23, the second conductor insulating layer 24 is made of the same material as the first conductor insulating layer 12, and the thickness of the first conductor insulating layer 12 is larger than that of the second conductor insulating layer 24.
As an alternative embodiment, a conductive cloth tape is also provided between the flexible shielding layer 60 and the cabling filler layer 40, wrapped around the exterior of the polyester tape wrap 50. The number of the wrapping layers of the conductive cloth adhesive tape is two, the lap rate is 35% -45%, the contact resistance of the cable core is small and stable after the cable core is tightly wrapped, and electric lap joint and electric sealing of a gap are realized.
As an alternative embodiment, the first conductor 11 and the second conductor 211 adopted by the control wire core 21 are both stranded copper conductors, and are formed by stranding galvanized copper wires, so that the advantages of good electrical performance, large current-carrying capacity and flexibility are achieved.
As an alternative embodiment, the first conductor shielding layer 13 is a copper wire braided shielding layer, the thickness of the copper wire braided shielding layer is 0.10 mm-0.15 mm, and the braiding angle is 45 degrees, so that the power cable core is protected from electromagnetic interference, and the anti-interference performance of the cable is improved.
As an alternative embodiment, the nylon yarn or glass fiber bundle braiding layer adopted by the explosion-proof layer 15 has the thickness of 0.10 mm-0.2 mm and the braiding angle of 45-55 degrees, so as to improve the compression resistance of the cable, avoid deformation and damage of an internal wire core caused by overhigh pressure, improve the reliability and stability of circuits and electrical equipment, and ensure normal operation.
As an alternative embodiment, the control wire core 21 comprises a second conductor 211 and an insulating shielding layer 212, wherein the second conductor 211 comprises a plurality of strands of copper conductors stranded with each other, and the insulating shielding layer 212 is extruded on the outer wall of the second conductor 211;
The insulating shielding layer 212 is a three-layer co-extrusion layer and comprises an inner shielding layer, an insulating layer and an outer shielding layer which are sequentially distributed from inside to outside, so that the insulation and shielding of the control wire core are realized.
As an alternative embodiment, the ground wire core 30 includes a third conductor and a third insulation layer extruded on the outside of the third conductor, where the second conductor insulation layer 24, the first conductor insulation layer 12, and the third insulation layer are all polyvinyl chloride or crosslinked polyethylene insulation layers.
Further, the outer side wall of the liquid outlet pipe 14 is sequentially coated with an explosion-proof layer 15 and a first insulating layer 16 from inside to outside, and the explosion-proof layer 15 can be any one of woven mesh of copper wires, nylon wires and the like, so as to improve the compression resistance of the liquid outlet pipe 14 and avoid deformation or even burst of the liquid outlet pipe 14 caused by overhigh pressure.
Preferably, the explosion-proof layer 15 is provided as
As shown in fig. 1 and 3, the control cable core 20 includes two tangent control cable cores 21 twisted with each other, the control cable core 20 further includes a cable core filling layer 22, a cable core wrapping layer 23, and a second conductor insulating layer 24, the cable core filling layer 22 is disposed on two sides of the two control cable cores 21 and is wrapped with the cable core wrapping layer 23 together with the two control cable cores 21 to form a circular cross section, the cable core filling layer 22 is made of glass fiber ropes, which has good flame retardance and insulation, the second conductor insulating layer 24 is wrapped on the outer side wall of the cable core wrapping layer 23, and the second conductor insulating layer 24 is made of crosslinked polyethylene.
To ensure the firmness of the wrapping, the core wrap 23 is preferably wrapped with polyester tape.
As shown in fig. 4, the control wire core 21 includes a second conductor 211 and an insulating shielding layer 212, where the second conductor 211 includes a plurality of strands of wires twisted with each other, and the insulating shielding layer 212 is extruded on the outer wall of the second conductor 211.
Further, the insulating shielding layer 212 is a three-layer co-extrusion layer, and comprises an inner shielding layer, an insulating layer and an outer shielding layer which are sequentially distributed from inside to outside, wherein the inner shielding layer and the outer shielding layer are made of semi-conductive polyolefin, the insulating layer is made of crosslinked polyethylene, electromagnetic field shielding is carried out through the inner shielding layer and the outer shielding layer, and the influence of electromagnetic field on signal transmission of the second conductor 211 is reduced.
While the utility model has been described with reference to preferred embodiments, it is not intended to be limiting. Those skilled in the art will appreciate that various modifications and adaptations can be made without departing from the spirit and scope of the present utility model. Accordingly, the scope of the utility model is defined by the appended claims.
Claims (10)
1. A low voltage dc control cable for rail transit comprising:
The plurality of power cable cores (10) and the at least one control cable core (20) are arranged in a mutually-cutting mode;
At least one grounding wire core (30) arranged in a slit formed on the outer sides of the control cable core (20) and the two power cable cores (10);
A cabling filler layer (40) which is arranged in a gap between the adjacent power cable core (10) and the control cable core (20) and is wrapped together with the power cable core (10), the control cable core (20) and the grounding wire core (30) by a polyester tape wrapping layer (50) to form a power cable core with a circular cross section;
a flexible shielding layer (60) which is wrapped outside the polyester tape wrapping layer (50), and a substrate formed by glass fiber braided wires and copper wires which are compositely wound on the substrate form the overall shielding of the control cable;
an outer sheath (70) extruded over the flexible shielding layer (60);
The power cable core (10) comprises a first conductor (11), a first conductor insulating layer (12), a first conductor shielding layer (13), a fireproof layer (14), an explosion-proof layer (15) and an inner sheath (16) which are sequentially arranged from inside to outside along the radial direction, wherein the fireproof layer (14) is formed by wrapping a mica tape of a pre-impregnated ceramic fireproof material, and the explosion-proof layer (15) is a nylon wire or glass fiber bundle weaving layer;
The control cable core (20) comprises control cable cores (21), core filling layers (22), core winding layers (23) and second conductor insulating layers (24) which are arranged in sequence from inside to outside along the radial direction, wherein the plurality of control cable cores (21) are formed by twisting each other in pairs, the core filling layers (22) are arranged on two sides of the two control cable cores (21) and are wound into a control cable core with a circular section together with the two control cable cores (21) by the core winding layers (23), the second conductor insulating layers (24) are coated on the outer side wall of the core winding layers (23), the second conductor insulating layers (24) are made of the same material as the first conductor insulating layers (12), and the thickness of the first conductor insulating layers (12) is larger than that of the second conductor insulating layers (24).
2. The low voltage direct current control cable for rail transit of claim 1, wherein a conductive cloth tape is further provided between the flexible shielding layer (60) and the cabling filler layer (40), wrapped outside the polyester tape wrapping layer (50).
3. The low-voltage direct-current control cable for track traffic according to claim 2, wherein the number of wrapping layers of the conductive cloth tape is two, and the lap joint rate is 35% -45%.
4. The low-voltage direct-current control cable for rail transit according to claim 1, characterized in that the first conductor (11) and the second conductor (211) used by the control wire core (21) are both stranded copper conductors, formed by stranding galvanized copper wires.
5. The low-voltage direct-current control cable for track traffic according to claim 1, characterized in that the first conductor shielding layer (13) is a copper wire braided shielding layer, the thickness of which is 0.10 mm-0.15 mm, and the braiding angle is 45 °.
6. The low-voltage direct-current control cable for track traffic according to claim 1, characterized in that the explosion-proof layer (15) is a nylon wire or glass fiber bundle braid, the thickness of which is 0.10 mm-0.2 mm, and the braiding angle is 45 ° -55 °.
7. The low-voltage direct-current control cable for track traffic according to claim 1, characterized in that the control wire core (21) comprises a second conductor (211) and an insulating shielding layer (212), the second conductor (211) comprises a plurality of strands of copper conductors stranded with each other, and the insulating shielding layer (212) is extruded on the outer wall of the second conductor (211);
The insulating shielding layer (212) is a three-layer co-extrusion layer and comprises an inner shielding layer, an insulating layer and an outer shielding layer which are sequentially distributed from inside to outside.
8. The low voltage direct current control cable for rail transit of claim 1, wherein the ground wire core (30) comprises a third conductor and a third insulation layer extruded outside the third conductor, and the second conductor insulation layer (24), the first conductor insulation layer (12) and the third insulation layer are all polyvinyl chloride or crosslinked polyethylene insulation layers.
9. The low voltage direct current control cable for rail transit of claim 1, wherein the total thickness of the flexible shielding layer (60) is controlled to be 1 mm-1.5 mm.
10. The low-voltage direct-current control cable for track traffic according to claim 1, characterized in that the outer sheath (70) adopts a polyethylene sheath layer or a polyvinyl chloride sheath layer, and has a thickness of 1.5 mm-2 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323523879.1U CN222088337U (en) | 2023-12-24 | 2023-12-24 | A low voltage DC control cable for rail transit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323523879.1U CN222088337U (en) | 2023-12-24 | 2023-12-24 | A low voltage DC control cable for rail transit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN222088337U true CN222088337U (en) | 2024-11-29 |
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ID=93604356
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202323523879.1U Active CN222088337U (en) | 2023-12-24 | 2023-12-24 | A low voltage DC control cable for rail transit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN222088337U (en) |
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2023
- 2023-12-24 CN CN202323523879.1U patent/CN222088337U/en active Active
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