CN220984228U - Cross-linked polyethylene insulated direct-current 1500V flame-retardant B1-level power cable for track traffic - Google Patents
Cross-linked polyethylene insulated direct-current 1500V flame-retardant B1-level power cable for track traffic Download PDFInfo
- Publication number
- CN220984228U CN220984228U CN202323042278.9U CN202323042278U CN220984228U CN 220984228 U CN220984228 U CN 220984228U CN 202323042278 U CN202323042278 U CN 202323042278U CN 220984228 U CN220984228 U CN 220984228U
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- Prior art keywords
- layer
- cross
- power cable
- flame retardant
- wrapping
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- 239000003063 flame retardant Substances 0.000 title claims abstract description 31
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 title claims abstract description 30
- 229920003020 cross-linked polyethylene Polymers 0.000 title claims abstract description 22
- 239000004703 cross-linked polyethylene Substances 0.000 title claims abstract description 22
- 229920005989 resin Polymers 0.000 claims abstract description 23
- 239000011347 resin Substances 0.000 claims abstract description 23
- 229920001971 elastomer Polymers 0.000 claims abstract description 18
- 239000000806 elastomer Substances 0.000 claims abstract description 18
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000010439 graphite Substances 0.000 claims abstract description 16
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 16
- 239000003365 glass fiber Substances 0.000 claims description 11
- 239000010445 mica Substances 0.000 claims description 11
- 229910052618 mica group Inorganic materials 0.000 claims description 11
- 239000004745 nonwoven fabric Substances 0.000 claims description 11
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 8
- 230000000903 blocking effect Effects 0.000 claims description 7
- 239000004020 conductor Substances 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 229920005749 polyurethane resin Polymers 0.000 claims description 6
- 238000009413 insulation Methods 0.000 claims description 4
- 239000000779 smoke Substances 0.000 claims description 4
- 229920000098 polyolefin Polymers 0.000 claims description 3
- 238000009954 braiding Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 6
- 238000002485 combustion reaction Methods 0.000 description 3
- 229910010272 inorganic material Inorganic materials 0.000 description 3
- 239000011147 inorganic material Substances 0.000 description 3
- 230000008093 supporting effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 239000012796 inorganic flame retardant Substances 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000009941 weaving Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- Insulated Conductors (AREA)
Abstract
The utility model relates to the technical field of cables, in particular to a cross-linked polyethylene insulated direct-current 1500V flame-retardant B1-level power cable for track traffic, which comprises the following components: the cable comprises a plurality of conductive wire cores and a filling layer, wherein the filling layer is filled in gaps among the plurality of conductive wire cores, the conductive wire cores and the filling layer are wrapped by a wrapping layer together to form a round cross-section shape, elastic strips are arranged in the filling layer between two adjacent conductive wire cores, each elastic strip comprises a plurality of mutually twisted elastomer resin pipes, and fireproof putty strips are filled in the elastomer resin pipes; the elastomer resin tube is hollow structure, can reduce the filling amount of filling layer to can improve holistic tensile properties of cable and flexibility, expanded graphite can take place the inflation rapidly when receiving the high temperature, blocks up the fire and spreads the passageway, plays fire-retardant effect, improves the flame retardant efficiency of cable, and expanded graphite's density is little, light in weight can reduce cable weight.
Description
Technical Field
The utility model relates to the technical field of cables, in particular to a cross-linked polyethylene insulated direct-current 1500V flame-retardant B1-level power cable for track traffic.
Background
Urban rail transit is for adopting the track structure to carry out bearing and the vehicle transportation system of direction, and urban rail transit includes: the underground power system comprises a subway system, a light rail system, a monorail system, a tramcar and the like, wherein the running rail of the subway system is mostly laid in an underground tunnel mode, and the space in the tunnel is relatively closed, so that the subway power system needs to have a relatively high fire-proof grade.
At present, the vehicle traction power supply in a subway power system mostly adopts 1500V direct current power supply, a power cable used for traction power supply is a direct current 1500V power cable, in order to meet the fireproof requirement, the used direct current 1500V power cable needs to reach a B1-level flame retardant standard, in order to meet the B1-level flame retardant standard, a large amount of inorganic flame retardant filler is filled in the cable, and the weight of the cable is increased and the flexibility is reduced due to the fact that a large amount of inorganic flame retardant filler is filled.
Disclosure of utility model
According to a first aspect of the present utility model, there is provided a crosslinked polyethylene insulated dc 1500V flame retardant B1 grade power cable for rail transit, comprising:
A plurality of conductive wire cores;
a filling layer filled in gaps among the plurality of conductive wire cores, wherein the conductive wire cores and the filling layer are wrapped together by a wrapping layer to form a circular cross-section shape;
The shielding layer is coated on the outer side wall of the wrapping layer;
The inner sheath is extruded on the outer side wall of the shielding layer;
the water blocking belt is wrapped on the outer side wall of the inner sheath;
The outer sheath is extruded on the outer side wall of the water blocking belt;
The elastic strips are arranged in the filling layers between two adjacent conductive wire cores, each elastic strip comprises a plurality of mutually stranded elastic resin pipes, and fireproof putty strips are filled in the elastic resin pipes.
Preferably, the elastomer resin tube is made of polyurethane resin.
Preferably, the fire-proof putty strip is an expanded graphite strip.
Preferably, the wrapping layer comprises a non-woven fabric layer, the wrapping covering rate of the non-woven fabric layer is more than 25%, and the number of wrapping layers is two.
Preferably, the wrapping layer further comprises an alkali-free glass fiber layer, the alkali-free glass fiber layer is wrapped on the outer side wall of the non-woven fabric layer, the wrapping lap rate of the alkali-free glass fiber layer is greater than 40%, and the wrapping layer number is 1.
Preferably, the shielding layer comprises a copper wire braided shielding layer, the braiding density is 90%, and the diameter of the copper wire is 0.10-0.15mm.
Preferably, the inner sheath and the outer sheath comprise a halogen-free low smoke cross-linked polyolefin layer.
Preferably, the conductive core comprises a conductor and an insulating layer, the conductor being twisted with each other via a plurality of strands of wire and being extrusion-molded through the insulating layer.
Preferably, the conductive wire core further comprises a mica tape, the mica tape is wrapped on the outer side wall of the insulating layer, the wrapping lap rate of the mica tape is greater than 40%, and the wrapping layer number is 1.
Preferably, the insulating layer is a crosslinked polyethylene insulating layer.
Compared with the prior art, the cross-linked polyethylene insulation direct current 1500V flame-retardant B1-level power cable for track traffic is provided with a plurality of elastic strips in a filling layer formed by filling inorganic materials, the elastic strips are composed of a plurality of elastomer resin pipes filled with expanded graphite, the elastomer resin pipes are of hollow structures, the filling amount of the filling layer can be reduced, and the elastomer resin pipes made of polyurethane resin have good supportability, higher tensile strength and elasticity and can improve the overall tensile property and flexibility of the cable; therefore, when the filled expanded graphite is subjected to high temperature, the filled expanded graphite can rapidly expand to block a fire spreading channel, so that a flame retardant effect is achieved, the flame retardant effect of the cable is improved, the density of the expanded graphite is small, the weight is light, and the weight of the cable can be 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.
Fig. 1 is a schematic structural diagram of a cross-linked polyethylene insulated dc 1500V flame retardant B1 grade power cable for rail transit according to an embodiment of the present utility model.
Fig. 2 is a schematic cross-sectional structure diagram of a cross-linked polyethylene insulated dc 1500V flame retardant B1 grade power cable for rail transit according to an embodiment of the present utility model.
Fig. 3 is a schematic cross-sectional structure of an elastic strip according to an embodiment of the present utility model.
In the above figures 1-3, the meaning of the individual reference numerals is defined as follows:
1. A conductive wire core; 11. a conductor; 12. an insulating layer; 13. a mica tape; 2. a filling layer; 3. an elastic strip; 31. an elastomer resin tube; 32. fireproof putty strips; 4. wrapping the layer; 5. a shielding layer; 6. an inner sheath; 7. a water blocking tape; 8. an outer sheath.
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.
As shown in fig. 1, the utility model provides a cross-linked polyethylene insulated direct current 1500V flame-retardant B1-level power cable for track traffic, which comprises a conductive wire core 1, a filling layer 2, an elastic strip 3, a wrapping layer 4, a shielding layer 5, an inner sheath 6, a water blocking tape 7 and an outer sheath 8, wherein the conductive wire core 1 comprises a conductor 11 and an insulating layer 12, and the conductor 11 is mutually twisted by a plurality of oxygen-free copper wires and is extruded and fixed by the insulating layer 12.
In an alternative embodiment, the insulating layer 12 is a crosslinked polyethylene insulating layer that has good insulation properties while also having good flex resistance.
Further, the conductive wire core 1 further comprises a mica tape 13, the mica tape 13 is wrapped on the outer side wall of the insulating layer 12, the wrapping lap rate of the mica tape 13 is greater than 40%, the wrapping layer number is 1, and the mica tape 13 has excellent high temperature resistance and combustion resistance, and the flame retardant property of the cable is improved.
As shown in fig. 2, the filling layer 2 is filled in the gaps among the plurality of conductive wire cores 1, the conductive wire cores 1 and the filling layer 2 are wrapped around the wrapping layer 4 to form a circular cross-section shape, at present, the filling layer 2 of the B1-level flame-retardant power cable is formed by filling inorganic materials such as magnesium oxide, metal salt powder and the like, and the filling is relatively compact, so that the density of the filling layer 2 is relatively high, and the weight of the cable is increased.
In order to reduce the weight of the filling layer 2, as shown in fig. 1 and 2, elastic strips 3 are disposed in the filling layer 2 between two adjacent conductive wire cores 1, and the elastic strips 3 include a plurality of elastomer resin tubes 31 twisted with each other.
The elastomer resin tube 31 is of a hollow structure, so that the elastomer resin tube 31 can play a supporting role while reducing the filling amount of the filling layer 2, the collapse deformation of the filling layer 2 is avoided, and the section roundness of the cable is ensured.
In an alternative embodiment, the elastomer resin tube 31 is made of polyurethane resin, and the elastomer resin tube 31 made of polyurethane resin has good supporting property, higher tensile strength and elasticity, and can improve the tensile performance and flexibility of the whole cable.
As shown in fig. 3, the elastomer resin tube 31 is filled with the fireproof putty strip 32, the fireproof putty strip 32 is expanded graphite, and when the expanded graphite is subjected to high temperature, the expanded graphite can rapidly expand to block a fire spreading channel, so that the flame retardant effect of the cable is improved, the density of the expanded graphite is low, the weight of the cable can be reduced.
The combination 1 and the figure 2 show, and around the covering 4 includes the non-woven fabrics layer, and the non-woven fabrics layer forms through the non-woven fabrics area around the package, and around package overlap ratio is greater than 25%, and the number of windings is two, closely winds the package through the non-woven fabrics layer, with a plurality of conductive core 1, filling layer 2 and elasticity strip 3 solid, avoids the cable core to appear loosely.
Further, the wrapping layer 4 further comprises an alkali-free glass fiber layer, the alkali-free glass fiber layer is wrapped on the outer side wall of the non-woven fabric layer, the alkali-free glass fiber layer is formed by wrapping an alkali-free glass fiber belt, the wrapping lap rate is more than 40%, the wrapping layer number is 1, the alkali-free glass fiber belt has good electrical insulation property, and the strength is high, has incombustibility, effectively increases the tensile strength of the cable, and improves the flame retardant property of the cable.
As shown in fig. 1 and 2, the shielding layer 5 is coated on the outer side wall of the wrapping layer 4, the shielding layer 5 comprises a copper wire woven shielding layer, the weaving density is 90%, the diameter of the copper wire is 0.10-0.15mm, a good shielding effect can be achieved, and the diameter of the copper wire is preferably 0.10mm in order to enable the cable to have good flexibility.
As shown in fig. 1 and 2, the inner sheath 6 is extruded on the outer side wall of the shielding layer 5, the water-blocking tape 7 is wrapped on the outer side wall of the inner sheath 6, the outer sheath 8 is extruded on the outer side wall of the water-blocking tape 7, and the inner sheath 6 and the outer sheath 8 comprise halogen-free low-smoke cross-linked polyolefin layers which have the characteristics of low smoke and no toxicity during combustion and have good flame retardance, so that continuous combustion is avoided.
Preferably, the wrapping covering rate of the water-blocking tape 7 is more than 30%, and the number of wrapping layers is one, so that the water-blocking tape 7 contains high-molecular water-absorbing resin, can absorb water and expand, and plays a role in blocking water.
By integrating the above embodiments, the plurality of elastic strips 3 are arranged in the filling layer 2 formed by filling inorganic materials, and the elastic strips 3 are composed of a plurality of elastomer resin pipes 31 filled with expanded graphite, the elastomer resin pipes 31 are of hollow structures, so that the filling amount of the filling layer 2 can be reduced, the elastomer resin pipes 31 made of polyurethane resin have good supporting property, higher tensile strength and elasticity, the tensile property and flexibility of the whole cable can be improved, and when the filled expanded graphite is subjected to high temperature, the filled expanded graphite can rapidly expand to block a fire spreading channel, thereby playing a flame retardant role, improving the flame retardant effect of the cable, and the expanded graphite has small density and light weight.
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 crosslinked polyethylene insulated dc 1500V flame retardant B1 grade power cable for rail transit comprising:
A plurality of conductive wire cores (1);
A filling layer (2) filled in gaps among the plurality of conductive wire cores (1), wherein the conductive wire cores (1) and the filling layer (2) are wrapped together by a wrapping layer (4) to form a circular cross-sectional shape;
A shielding layer (5) which is coated on the outer side wall of the wrapping layer (4);
an inner sheath (6) is extruded on the outer side wall of the shielding layer (5);
a water blocking belt (7) wrapped on the outer side wall of the inner sheath (6);
an outer sheath (8) is extruded on the outer side wall of the water-blocking tape (7);
The novel fireproof cable comprises a filling layer (2) and is characterized in that elastic strips (3) are arranged in the filling layer (2) between two adjacent conductive cable cores (1), each elastic strip (3) comprises a plurality of mutually stranded elastic resin pipes (31), and fireproof putty strips (32) are filled in the elastic resin pipes (31).
2. The cross-linked polyethylene insulated dc 1500V flame retardant B1 grade power cable for rail transit of claim 1, wherein the material of the elastomer resin tube (31) is polyurethane resin.
3. The cross-linked polyethylene insulated dc-1500V flame retardant B1 grade power cable for rail transit of claim 1, wherein the fire blocking strips (32) are expanded graphite strips.
4. The cross-linked polyethylene insulated direct current 1500V flame retardant B1 grade power cable for rail transit of claim 1, wherein the wrapping layer (4) comprises a non-woven fabric layer, the wrapping coverage rate of the non-woven fabric layer is more than 25%, and the number of wrapping layers is two.
5. The cross-linked polyethylene insulated direct current 1500V flame retardant B1 grade power cable for rail transit of claim 4, wherein the wrapping layer (4) further comprises an alkali-free glass fiber layer, the alkali-free glass fiber layer is wrapped on the outer side wall of the non-woven fabric layer, the wrapping coverage rate of the alkali-free glass fiber layer is greater than 40%, and the number of wrapping layers is 1.
6. The cross-linked polyethylene insulated direct current 1500V flame retardant B1 grade power cable for rail transit of claim 1, wherein the shielding layer (5) comprises a copper wire braided shielding layer with a braiding density of 90% and a copper wire diameter of 0.10-0.15mm.
7. The cross-linked polyethylene insulated direct current 1500V flame retardant B1 grade power cable for rail transit of claim 1, wherein the inner sheath (6) and the outer sheath (8) comprise a halogen-free low smoke cross-linked polyolefin layer.
8. The cross-linked polyethylene insulated direct current 1500V flame retardant B1 grade power cable for rail transit according to any of claims 1-7, wherein the conductive core (1) comprises a conductor (11) and an insulation layer (12), the conductor (11) being intertwined via several strands of wire and being extrusion-fixed by the insulation layer (12).
9. The cross-linked polyethylene insulated direct current 1500V flame retardant B1 grade power cable for rail transit of claim 8, wherein the conductive wire core (1) further comprises a mica tape (13), the mica tape (13) is wrapped on the outer side wall of the insulating layer (12), the wrapping coverage rate of the mica tape (13) is greater than 40%, and the number of wrapping layers is 1.
10. The cross-linked polyethylene insulated dc-1500V flame retardant B1 grade power cable for rail transit of claim 8, wherein the insulating layer (12) is a cross-linked polyethylene insulating layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323042278.9U CN220984228U (en) | 2023-11-10 | 2023-11-10 | Cross-linked polyethylene insulated direct-current 1500V flame-retardant B1-level power cable for track traffic |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323042278.9U CN220984228U (en) | 2023-11-10 | 2023-11-10 | Cross-linked polyethylene insulated direct-current 1500V flame-retardant B1-level power cable for track traffic |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220984228U true CN220984228U (en) | 2024-05-17 |
Family
ID=91038369
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202323042278.9U Active CN220984228U (en) | 2023-11-10 | 2023-11-10 | Cross-linked polyethylene insulated direct-current 1500V flame-retardant B1-level power cable for track traffic |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220984228U (en) |
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2023
- 2023-11-10 CN CN202323042278.9U patent/CN220984228U/en active Active
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