CN219626376U - Multi-core weather-proof overhead insulated cable - Google Patents
Multi-core weather-proof overhead insulated cable Download PDFInfo
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- CN219626376U CN219626376U CN202320258646.4U CN202320258646U CN219626376U CN 219626376 U CN219626376 U CN 219626376U CN 202320258646 U CN202320258646 U CN 202320258646U CN 219626376 U CN219626376 U CN 219626376U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/14—Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables
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Abstract
The utility model provides a multi-core weather-resistant overhead insulated cable, which comprises a cable core, wherein a plurality of cable cores are tangent to each other two by two and are twisted with each other; the inner sheath is extruded on the outer wall of the wire core; a heat conduction strip arranged on the outer wall of the inner sheath; the outer sheath is extruded on the outer walls of the inner sheath and the heat conducting strips; the heat conducting strips extend along the axial direction of the cable, and a plurality of heat conducting strips are arranged on the outer wall of the inner sheath in a central symmetrical mode and are embedded into the inner side of the outer sheath; the cable core is formed by radially, seamlessly and tightly staggered, mutually contacted and tightly connected, so that the loss of transmission electric quantity is greatly reduced, the transmission speed of the cable is increased, the external interference is reduced, the tensile resistance and creep resistance of the cable core are further enhanced, the heat of the cable core during working can be outwards conducted by the heat conducting strip, the heat dissipation of the cable is accelerated, and the accumulation of ice and snow on the surface of the cable is reduced.
Description
Technical Field
The utility model relates to the technical field of power cables, in particular to a multi-core weather-resistant overhead insulated cable.
Background
Overhead power transmission cables are very important as carriers for power transmission in transmission lines. The overhead cable is applied to the open air, needs to deal with outdoor environment's bad weather, in autumn and winter season's sleet weather, the surface of cable can condense to have ice or cover has sleet, causes the holistic weight increase of cable, when receiving wind-force effect to produce the swing, easily causes the cable to produce fracture or short circuit because of bearing overweight.
The prior art generally melts rain and snow through establishing the zone of heating in the cable, but the setting of zone of heating leads to cable structure complicacy, and influences the outward conduction of cable during operation heat, leads to electric wire and cable's heat dispersion poor, is unfavorable for electric wire and cable's heat dissipation, and electric wire overheated can make its resistance increase, influences its electric conductivity. Accordingly, there is a need for an overhead insulated cable that can improve the weatherability of the cable, does not affect the heat dissipation of the cable, and can improve the conductivity of the cable.
Disclosure of Invention
In view of the drawbacks of the prior art, a first aspect according to the object of the present utility model proposes a multi-core weather-resistant overhead insulated cable comprising:
the wire cores are tangent to each other two by two and are twisted with each other;
the inner sheath is extruded on the outer wall of the wire core;
a heat conduction strip arranged on the outer wall of the inner sheath;
the outer sheath is extruded on the outer walls of the inner sheath and the heat conducting strips;
the heat conducting strips comprise metal aluminum materials with inverted T-shaped cross sections, and the inner sides of the heat conducting strips are provided with spacing grooves in an equidistant mode;
the heat conducting strips extend along the axial direction of the cable, and a plurality of heat conducting strips are arranged on the outer wall of the inner sheath in a central symmetrical mode and are embedded into the inner side of the outer sheath;
the multi-core weather-proof overhead insulated cable is further provided with a polyester tape cladding, wherein the polyester tape cladding is spirally wound on the outer side of the inner sheath at equal intervals and is embedded in the inter-groove of the heat conducting strip, so that the heat conducting strip is fixed on the outer side of the inner sheath.
Further, the heat conducting strips are arranged in three, are embedded in the inner side of the outer sheath in a central symmetrical distribution mode, and correspond to the three round corners of the outer sheath.
Further, the cable core comprises a central guide core and an inner core wire layer wrapping the outer wall of the central guide core, a middle core wire layer wraps the outer wall of the inner core wire layer, and an outer core wire layer wraps the outer wall of the middle core wire layer.
Further, the central guide core comprises an aluminum alloy conductor with a circular cross section.
Further, the inner core wire layer, the middle core wire layer and the outer core wire layer all comprise aluminum alloy wires with fan-shaped cross sections.
Further, the inner core wire layer is formed by cutting and twisting six fan-shaped aluminum alloy wires in pairs, the middle core wire layer is formed by cutting and twisting twelve fan-shaped aluminum alloy wires in pairs, and the outer core wire layer is formed by cutting and twisting eighteen fan-shaped aluminum alloy wires in pairs.
Further, the fan arc angle of the fan arc aluminum alloy wire of the inner core wire layer is sixty degrees, the fan arc angle of the fan arc aluminum alloy wire of the middle core wire layer is thirty degrees, and the fan arc angle of the fan arc aluminum alloy wire of the outer core wire layer is twenty degrees.
Further, the inner sheath comprises a silicon rubber layer, and the extrusion thickness is 0.3mm-0.8mm.
Further, the outer sheath comprises a polyvinyl chloride layer, and the extrusion thickness is 1mm-5mm.
Compared with the prior art, the multi-core weather-resistant overhead insulated cable has the remarkable advantages that:
1. the cable core is formed by radially seamless close staggered connection, so that the mutual contact is more close, the transmission electric quantity loss is greatly reduced, the cable conveying speed is improved, the external interference is reduced, and the tensile property and the creep resistance of the cable core are further enhanced;
2. the inner sheath is extruded on the outer wall of the wire core, the heat conducting strip is arranged between the inner sheath and the outer sheath, and can conduct heat of the wire core during working outwards, so that heat dissipation of the cable is accelerated, and ice and snow accumulation on the surface of the cable is reduced.
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 cross-sectional view of a multi-core weather-resistant overhead insulated cable according to an embodiment of the utility model;
FIG. 2 is a schematic cross-sectional view of an inner jacket, heat conducting strips, and polyester tape cladding as shown in an embodiment of the present utility model;
FIG. 3 is a schematic view of a part of a heat conducting strip according to an embodiment of the present utility model;
fig. 4 is a schematic structural view of an unencumbered outer jacket of a multi-core weather-resistant overhead insulated cable according to an embodiment of the present utility model.
In the figure, 1, a wire core; 11. a central guide core; 12. an inner core layer; 13. a middle core layer; 14. an outer core layer; 2. an inner sheath; 3. a heat conducting strip; 301. a space groove; 4. an outer sheath; 5. polyester tape cladding.
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 multi-core weather-resistant overhead insulated cable combined with the embodiment shown in fig. 1-4 comprises a wire core 1, an inner sheath 2, a heat conducting strip 3, an outer sheath 4 and a polyester tape cladding 5. The plurality of wire cores 1 are tangent to each other in pairs and are twisted with each other to form a twisted structure with a circular section.
In an alternative embodiment, the wire core 1 includes a central conductive core 11 and an inner core layer 12 wrapped around the outer wall of the central conductive core 11, the outer wall of the inner core layer 12 is wrapped with a middle core layer 13, and the outer wall of the middle core layer 13 is wrapped with an outer core layer 14.
In order to improve the conveying capacity of the cable and reduce the line loss of the cable on the premise that the conductor area of the overhead insulated cable is unchanged and the mechanical property is not reduced. As shown in fig. 1, the central core 11 includes an aluminum alloy wire having a circular cross section, and the inner core layer 12, the middle core layer 13, and the outer core layer 14 each include an aluminum alloy wire having a fan-shaped cross section.
The long-term working temperature of the aluminum alloy wire is 150 ℃, the short-time temperature can reach 180 ℃, so that the continuous allowable current-carrying capacity is 1.5-1.6 times that of a common wire with the same specification, the strength is the same as that of the common wire at normal temperature, the high-temperature operation mechanical strength retention rate can be kept above 90%, the creep characteristics of the aluminum alloy wire at normal temperature and high temperature are kept to the same degree compared with those of the common wire, and the aluminum alloy wire is more suitable for laying application in long-distance, large-span and ultra-high-voltage transmission compared with the common wire.
Specifically, the inner core wire layer 12 is formed by cutting and twisting six arc-shaped aluminum alloy wires in pairs, the middle core wire layer 13 is formed by cutting and twisting twelve arc-shaped aluminum alloy wires in pairs, and the outer core wire layer 14 is formed by cutting and twisting eighteen arc-shaped aluminum alloy wires in pairs.
It should be understood that the central angle is 360 degrees, the inner core wire layer 12 has six fan-shaped arc aluminum alloy wires, the arc angle of the single fan-shaped arc aluminum alloy wire is sixty degrees, the middle core wire layer 13 has twelve fan-shaped arc aluminum alloy wires, the arc angle of the single fan-shaped arc aluminum alloy wire is thirty degrees, the outer core wire layer 14 has eighteen fan-shaped arc aluminum alloy wires, and the arc angle of the single fan-shaped arc aluminum alloy wire is twenty degrees.
To sum up the above-mentioned embodiment, divide into the multilayer transposition structure with sinle silk 1 in this embodiment, the center adopts single cross-section to be circular aluminum alloy wire, circular aluminum alloy wire outer wall has set gradually the three-layer from interior to exterior, be radial seamless closely staggered connection by a plurality of longitudinal sections for fan-shaped aluminum alloy wire and constitute, adopt fan-shaped pitch line to replace round single line, and be radial seamless closely staggered constitution transposition structure, the mutual contact is inseparabler between the single heart yearn, can reduce transmission power loss by a wide margin, moreover, the conductivity of aluminum alloy wire is high, further can reduce the transmission power loss after the cable shaping.
Further, the inner sheath 2 is extruded around the outer wall of the wire core 1.
Specifically, the inner sheath 2 is made of silicone rubber material, and is extruded on the outer wall of the wire core 1 through an extruder, wherein the extrusion thickness is 0.5mm-0.8mm.
Because of the poor thermal conductivity of conventional silicone rubbers, the thermal conductivity is typically only 0.2w/m.K. Alternatively, the silicone rubber material can be commercially available heat-conducting silicone rubber, namely silicone rubber with specific heat-conducting filler added on the basis of silicone rubber to improve the heat-conducting property of the silicone rubber. In particular, the commonly used heat conductive fillers are metal powders, metal oxides, metal nitrides, nonmetallic materials, and the like.
In order to improve the heat transfer efficiency of the wire core 1. As shown in fig. 1 and 2, a plurality of heat conducting strips 3 are arranged on the outer wall of the inner sheath 2 in a central symmetrical distribution.
Further, in order to enable heat generated during operation of the wire core 1 to be transferred to the outer sheath 4, the heat conducting strip 3 is made of metal aluminum with an inverted T-shaped cross section and is embedded inside the outer sheath 4.
In this embodiment, three heat conducting strips 3 are arranged and distributed outside the inner sheath 2 in a central symmetry manner.
The heat conducting strip 3 is prefabricated and formed by pure aluminum materials, the density of the pure aluminum is small, the weight is light, the heat conducting performance is high, the pure aluminum is fixed on the outer wall of the inner sheath 2 and is in conflict with the inner sheath 2, and heat transferred from the wire core 1 to the inner sheath 2 can be transferred to the outer sheath 4, so that the heat radiating efficiency of the wire core 1 during working is accelerated.
Specifically, the heat of the wire core 1 can be transmitted to the outer sheath 4 outwards by the heat conducting strip 3, so that the temperature of the surface of the outer sheath 4 can be increased in cold seasons, the ice and snow accumulation on the surface of the outer sheath 4 can be reduced to a certain extent, and the weather resistance of the formed cable is enhanced.
Further, the bending layout after the cable formation is not affected by the arrangement of the heat conductive strips 3. As shown in fig. 3 and 4, the inner side of each heat conducting strip 3 is provided with a plurality of equally spaced grooves 301.
Furthermore, in order to fix the heat conducting strips 3 on the outer wall of the inner sheath 2, displacement movement is not easy to occur in the process of extruding the outer sheath 4 later, so that after the cable is formed, the three heat conducting strips 3 can be arranged in a central symmetry distribution on the outer wall of the inner sheath 2.
As shown in fig. 4, the slots 301 between two adjacent heat conducting strips 3 are equidistantly and alternately distributed. As shown in fig. 2 and 4, in particular, three heat conducting strips 3 are defined, namely, 3A, 3B and 3C, and the inter-grooves 301 of 3A, 3B and 3C are equidistantly staggered.
Further, a polyester tape cladding 5 is wound on the outer sides of the inner sheath 2 and the heat conducting strips 3, and is used for fixing the positions of the heat conducting strips 3 on the inner sheath 2. It should be appreciated that the polyester tape wrapping 5 is spirally wound to secure the heat conducting strips 3 due to the equidistant staggered distribution of the inter-grooves 301 of adjacent heat conducting strips 3.
In a specific embodiment, when the heat conducting strips 3 are fixed, three heat conducting strips 3 are fixed on the outer wall of the inner sheath 2 in a central symmetrical distribution, and then the heat conducting strips 3 are bound on the outer wall of the inner sheath 2 by adopting the spiral winding of the polyester tape cladding 5 to fix the heat conducting strips. The polyester tape cladding 5 is spirally wound and embedded in the inter-groove 301 of the heat conducting strip 3, and is combined with the inter-groove 301 to limit and fix the heat conducting strip 3, and after binding is completed, a cable structure shown in fig. 4 is formed. Alternatively, the helical pitch of the polyester tape cladding 5 is the same as the pitch of the adjacent two inter-grooves 301.
In alternative embodiments, the polyester tape cladding 5 may be a fibrous tape of circular or rectangular cross-section, and is solid and durable and lightweight.
Further, the outer sheath 4 is extruded over the outer walls of the inner sheath 2 and the heat conducting strips 3.
In an alternative embodiment, the outer sheath 4 is made of polyvinyl chloride material and is extruded by an extruder to form an extrusion thickness of 2mm-5mm. The inner sheath 2 and the outer wall of the heat conducting strip 3 are extruded by the outer sheath, so that the inner structure of the cable can be protected.
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 multi-core weather-resistant overhead insulated cable comprising:
the cable comprises cable cores (1), wherein a plurality of cable cores (1) are tangent in pairs and twisted with each other;
the inner sheath (2) is extruded on the outer wall of the wire core (1);
a heat conducting strip (3) arranged on the outer wall of the inner sheath (2);
an outer sheath (4) which is extruded on the outer walls of the inner sheath (2) and the heat conducting strip (3);
the heat conducting strips (3) extend along the axial direction of the cable, and the plurality of heat conducting strips (3) are arranged on the outer wall of the inner sheath (2) in a central symmetry mode and are embedded in the inner side of the outer sheath (4);
the heat conducting strips (3) are made of metal aluminum materials with inverted T-shaped cross sections, and the inner sides of the heat conducting strips (3) are equidistantly provided with spacing grooves (301);
the multi-core weather-proof overhead insulated cable further comprises a polyester tape wrapping layer (5) which is wound on the outer side of the inner sheath (2) and is embedded in the inter-groove (301) of the heat conducting strip (3), so that the heat conducting strip (3) is fixed on the outer side of the inner sheath (2).
2. The multi-core weather-resistant overhead insulated cable according to claim 1, wherein the multi-core weather-resistant overhead insulated cable is provided with three heat conducting strips (3) which are embedded in the inner side of the outer sheath (4) in a central symmetrical distribution and correspond to three round corners of the outer sheath (4).
3. The multi-core weather-resistant overhead insulated cable according to claim 2, wherein the polyester tape cladding (5) is helically wound equidistantly on the outside of the inner sheath (2).
4. The multi-core weather-resistant overhead insulated cable according to claim 1, wherein the cable core (1) comprises a central guide core (11) and an inner core wire layer (12) wrapped on the outer wall of the central guide core (11), a middle core wire layer (13) is wrapped on the outer wall of the inner core wire layer (12), and an outer core wire layer (14) is wrapped on the outer wall of the middle core wire layer (13).
5. The multi-core weather-resistant overhead insulated cable of claim 4, wherein the central conductor (11) comprises an aluminum alloy conductor having a circular cross section.
6. The multi-core weather-resistant overhead insulated cable of claim 5, wherein the inner core layer (12), the middle core layer (13), and the outer core layer (14) each comprise aluminum alloy wires having a fan-shaped cross section.
7. The multi-core weather-resistant overhead insulated cable according to claim 6, wherein the inner core wire layer (12) is formed by cutting and twisting six fan-shaped arc-shaped aluminum alloy wires in pairs, the middle core wire layer (13) is formed by cutting and twisting twelve fan-shaped arc-shaped aluminum alloy wires in pairs, and the outer core wire layer (14) is formed by cutting and twisting eighteen fan-shaped arc-shaped aluminum alloy wires in pairs.
8. The multi-core weather-resistant overhead insulated cable of claim 7, wherein the fanned arc angle of the fanned arc aluminum alloy wire of the inner core wire layer (12) is sixty degrees, the fanned arc angle of the fanned arc aluminum alloy wire of the middle core wire layer (13) is thirty degrees, and the fanned arc angle of the fanned arc aluminum alloy wire of the outer core wire layer (14) is twenty degrees.
9. The multi-core weather-resistant overhead insulated cable according to any one of claims 1 to 8, wherein the inner sheath (2) comprises a silicone rubber layer, and the extrusion thickness is 0.3mm to 0.8mm.
10. The multi-core weather-resistant overhead insulated cable according to any one of claims 1 to 8, wherein the outer jacket (4) comprises a layer of polyvinyl chloride, and the extrusion thickness is 1mm to 5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320258646.4U CN219626376U (en) | 2023-02-20 | 2023-02-20 | Multi-core weather-proof overhead insulated cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320258646.4U CN219626376U (en) | 2023-02-20 | 2023-02-20 | Multi-core weather-proof overhead insulated cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219626376U true CN219626376U (en) | 2023-09-01 |
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ID=87767910
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320258646.4U Active CN219626376U (en) | 2023-02-20 | 2023-02-20 | Multi-core weather-proof overhead insulated cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219626376U (en) |
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2023
- 2023-02-20 CN CN202320258646.4U patent/CN219626376U/en active Active
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