CN220252903U - Medium-voltage polypropylene insulation environment-friendly flame-retardant fire-resistant cable - Google Patents
Medium-voltage polypropylene insulation environment-friendly flame-retardant fire-resistant cable Download PDFInfo
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- CN220252903U CN220252903U CN202321682197.2U CN202321682197U CN220252903U CN 220252903 U CN220252903 U CN 220252903U CN 202321682197 U CN202321682197 U CN 202321682197U CN 220252903 U CN220252903 U CN 220252903U
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- -1 polypropylene Polymers 0.000 title claims abstract description 41
- 239000004743 Polypropylene Substances 0.000 title claims abstract description 34
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 32
- 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 27
- 230000009970 fire resistant effect Effects 0.000 title claims abstract description 27
- 239000003063 flame retardant Substances 0.000 title claims abstract description 27
- 238000009413 insulation Methods 0.000 title claims abstract description 21
- 239000004020 conductor Substances 0.000 claims abstract description 26
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000001301 oxygen Substances 0.000 claims abstract description 25
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 25
- 238000002955 isolation Methods 0.000 claims abstract description 22
- 229910052751 metal Inorganic materials 0.000 claims abstract description 16
- 239000002184 metal Substances 0.000 claims abstract description 16
- 239000003365 glass fiber Substances 0.000 claims description 47
- 238000001125 extrusion Methods 0.000 claims description 17
- 238000005253 cladding Methods 0.000 claims description 15
- 230000007613 environmental effect Effects 0.000 claims description 11
- 239000004698 Polyethylene Substances 0.000 claims description 10
- 229920000573 polyethylene Polymers 0.000 claims description 9
- 239000000945 filler Substances 0.000 claims description 8
- 238000005187 foaming Methods 0.000 claims description 7
- 229920003023 plastic Polymers 0.000 claims description 6
- 239000004033 plastic Substances 0.000 claims description 6
- 229920000098 polyolefin Polymers 0.000 claims description 6
- 239000004800 polyvinyl chloride Substances 0.000 claims description 5
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 3
- 239000004745 nonwoven fabric Substances 0.000 claims description 3
- 229920000728 polyester Polymers 0.000 claims description 3
- 238000002485 combustion reaction Methods 0.000 abstract description 2
- 230000002349 favourable effect Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 12
- 230000004888 barrier function Effects 0.000 description 11
- 230000003139 buffering effect Effects 0.000 description 9
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 8
- 229910052802 copper Inorganic materials 0.000 description 8
- 239000010949 copper Substances 0.000 description 8
- 238000007493 shaping process Methods 0.000 description 8
- 229920003020 cross-linked polyethylene Polymers 0.000 description 7
- 239000004703 cross-linked polyethylene Substances 0.000 description 7
- 238000004804 winding Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 230000002265 prevention Effects 0.000 description 6
- 239000011810 insulating material Substances 0.000 description 5
- 229910000838 Al alloy Inorganic materials 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 4
- 239000002085 irritant Substances 0.000 description 3
- 231100000021 irritant Toxicity 0.000 description 3
- 229920000181 Ethylene propylene rubber Polymers 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000010425 asbestos Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052895 riebeckite Inorganic materials 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000002341 toxic gas Substances 0.000 description 2
- 239000004927 clay Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
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- Insulated Conductors (AREA)
Abstract
The utility model discloses a medium-voltage polypropylene insulation environment-friendly flame-retardant fire-resistant cable, which comprises a cable core, and an oxygen isolation layer, a fireproof mud layer and a sheath layer which are coated outside the cable core from inside to outside; the cable core is provided with at least one insulated wire core; the insulated wire core mainly comprises a conductor, and a semi-conductive conductor shielding layer, a polypropylene insulating layer, a semi-conductive insulating shielding layer, a semi-conductive buffer layer and a metal shielding layer which are sequentially coated outside the conductor from inside to outside. The medium-voltage flame-retardant fire-resistant cable can reliably resist flame and fire, delay the combustion of a cable core, is environment-friendly and good in impact resistance, can be effectively suitable for complex working condition environments of cable laying, and is favorable for being widely popularized and applied in important places with dense personnel, such as airports, hospitals, schools, subways, power stations, large-scale venues and the like.
Description
Technical Field
The utility model relates to a cable, and particularly discloses a medium-voltage polypropylene insulation environment-friendly flame-retardant fire-resistant cable.
Background
Applicant has disclosed early a medium voltage fire resistant cable technology named "a low thermal conductivity fire resistant mud and its preparation method and medium voltage fire resistant cable" (publication number CN 114349461A, publication number 2022, month 04, 15) ", and" a medium voltage fire resistant cable "(publication number CN 216902350U, publication number 2022, month 07, month 05). In this technique, the insulating layer of the insulating core is extruded from a crosslinked polyethylene material or ethylene propylene rubber. Because the insulating layer of the crosslinked polyethylene material or the ethylene propylene rubber can generate irritant gas in the extrusion process, and can not be recycled after being molded, the environmental protection performance is poor, and the improvement is needed.
Disclosure of Invention
The technical purpose of the utility model is that: aiming at the particularity and the deficiency of the medium-voltage fire-resistant cable, the medium-voltage polypropylene insulation environment-friendly flame-retardant fire-resistant cable is provided.
The technical purpose of the utility model is realized by the following technical scheme: a medium-voltage polypropylene insulation environment-friendly flame-retardant fire-resistant cable comprises a cable core, and an oxygen isolation layer, a fireproof mud layer and a sheath layer which are coated outside the cable core from inside to outside;
the cable core is provided with at least one insulated wire core;
the insulated wire core mainly comprises a conductor, and a semi-conductive conductor shielding layer, a polypropylene insulating layer, a semi-conductive insulating shielding layer, a semi-conductive buffer layer and a metal shielding layer which are sequentially coated outside the conductor from inside to outside.
The technical measures aim at the particularity of the medium-voltage fireproof cables of the publication numbers CN 114349461A and CN 216902350U, the insulation layers of the insulation wire cores are formed by extrusion of the polypropylene insulation materials, so that the insulation performance is met, meanwhile, the insulation layers can not generate irritant and toxic gases in the production process, and the insulation layers can be recycled after being formed, and are good in environmental protection.
As one of the preferable schemes, the cable core is provided with a plurality of insulating wire cores which are twisted together, and the twisting pitch diameter ratio of the insulating wire cores is 25-65 times;
and the stranding gaps of the cable core are filled with fillers.
The cable core adopting the technical measures has good flexibility while being compact and round, and is also beneficial to the weight reduction of the cable core.
Further, the outside of the cable core is coated with a tape layer positioned at the inner side of the oxygen isolation layer;
the wrapping band layer is a wrapping structure of a non-woven fabric belt, a polypropylene belt or a polyester belt.
The wrapping tape layer of the technical measure is beneficial to compact and round forming of the cable core.
As one of the preferable schemes, the semi-conductive buffer layer is an overlapped wrapping structure of a semi-conductive strip material with a foaming structure inside;
the thickness of the semiconductive buffer layer is 0.2-0.8 mm.
The semiconductive buffer layer of the technical measure can not obviously bulked the structure of the insulated wire core and can not generate apparent defects such as wrinkles and the like on one hand; on the other hand, the self-foaming of the semiconductive buffer belt effectively relieves the deformation between the thermal expansion of the insulated wire core and the metal shielding layer under the condition of fire, thereby reducing the damage of the insulated structure of the insulated wire core by the metal shielding layer and improving the fire resistance of the insulated wire core.
As one of the preferable schemes, the oxygen barrier layer is an extrusion structure of polyethylene, polyvinyl chloride or polyolefin plastic;
a plurality of ridges which are formed by protruding outwards from the outer wall are arranged on the circumference of the oxygen barrier layer, and the protruding height of each ridge is smaller than the cladding thickness of the fire-proof mud layer;
and each ridge on the outer wall of the oxygen barrier layer is respectively embedded into the fireproof mud layer.
The oxygen-isolation layer of the technical measure is fireproof, impact-resistant and waterproof, and can not release crystal water under the high-temperature environment of fire, so that the infiltration of moisture into the cable core is avoided, and the stability of the cable core structure is guaranteed. Simultaneously, separate oxygen layer and the cooperation structure on fire prevention mud layer, can ensure that fire prevention mud layer is attached to separating oxygen layer outer wall steadily, fire prevention mud layer combines separating oxygen layer and further separates outside heat to the inside conduction of cable core reliably, reduces the heat that the cable core received under the conflagration circumstances reliably.
As one of the preferable schemes, an armor layer with a metal wrapping structure is arranged between the fireproof mud layer and the outer sheath layer. The technical measure can reliably protect the internal cable core structure, and when the cable core structure is extruded or stretched by external force, the cable core structure is protected from being damaged, and the complex working condition environment of cable laying is effectively treated.
Further, an inner glass fiber tape wrapping layer with a glass fiber tape overlapping wrapping structure is arranged between the fireproof mud layer and the armor layer. The technical measure is that the fireproof mud layer is reliably restrained and positioned, so that the fireproof mud layer is beneficial to stably forming outside the oxygen-isolation layer; the armor layer and the fireproof mud layer are isolated and buffered, so that impact damage to the fireproof mud layer caused by the stressed armor layer is prevented; the three aspects have the technical effect of flame retardance.
Further, an outer glass fiber tape wrapping layer with a glass fiber tape overlapping wrapping structure is arranged between the outer sheath layer and the armor layer. The technical measure has the advantages that on one hand, the armor layer and the outer sheath layer are isolated and buffered, so that impact damage to the outer sheath layer caused by the stressed armor layer is prevented; the two aspects have the technical effect of flame retardance.
As one of the preferable schemes, the outer sheath layer is an extrusion structure of polyethylene, polyvinyl chloride or polyolefin plastics. The outer sheath layer of the technical measure is fireproof, impact-resistant and waterproof.
The beneficial technical effects of the utility model are as follows: the technical measures aim at the particularity of the medium-voltage fireproof cables of the publication numbers CN 114349461A and CN 216902350U, the insulating layer of the insulating wire core is formed by extruding the polypropylene insulating material, so that the insulating property is met, meanwhile, the insulating layer does not generate irritant and toxic gas in the production process, and the insulating layer can be recycled after being formed, and is good in environmental protection. Meanwhile, the inner cable core structure can be reliably protected through the forming of the armor layer, and the cable core structure is protected from being damaged when the cable core structure is extruded or stretched by external force, so that the complex working condition environment of cable laying is effectively protected; the glass fiber tape wrapping structure between the armor layer and the fireproof mud layer can reliably restrict and position the fireproof mud layer, also plays a role in isolating and buffering the armor layer and the fireproof mud layer, and also has a flame-retardant technical effect.
In summary, the medium-voltage flame-retardant fire-resistant cable formed by the technical measures not only can reliably resist flame and fire and delay the combustion of the cable core, but also is environment-friendly and good in impact resistance, can be effectively suitable for complex working condition environments of cable laying, and is favorable for being widely popularized and applied in important places with dense personnel, such as airports, hospitals, schools, subways, power stations, large-scale venues and the like.
Drawings
Fig. 1 is a schematic structural view of the present utility model.
The meaning of the symbols in the figures: 1-a conductor; 2-a semiconductive shield; 3-a polypropylene insulating layer; 4-a semiconductive insulating shield; 5-a semiconductive buffer layer; 6-a metal shielding layer; 7-filling; 8, a tape layer; 9-an oxygen barrier layer; 10-a fireproof mud layer; 11-wrapping the inner glass fiber tape; 12-an armor layer; 13-wrapping the outer glass fiber tape; 14-a sheath layer.
Description of the embodiments
The utility model relates to a cable, in particular to a medium-voltage polypropylene insulation environment-friendly flame-retardant fire-resistant cable, and the main technical content of the utility model is described in detail in a plurality of embodiments. Wherein, the embodiment 1 is combined with the attached drawing of the specification, namely, fig. 1, to clearly and specifically explain the technical scheme of the utility model; other embodiments, although not drawn separately, may still refer to the drawings of embodiment 1 for its main structure.
It is to be noted here in particular that the figures of the utility model are schematic, which for the sake of clarity have simplified unnecessary details in order to avoid obscuring the technical solutions of the utility model which contribute to the state of the art.
Examples
Referring to fig. 1, the medium voltage flame retardant fire resistant cable comprises a cable core with an insulating structure, and a tape layer 8, an oxygen isolation layer 9, a fire clay layer 10, an inner glass fiber tape wrapping layer 11, an armor layer 12, an outer glass fiber tape wrapping layer 13 and a sheath layer 14 which are sequentially coated from inside to outside on the outer side of the cable core.
Specifically, the cable core is formed by twisting three insulated wire cores at a pitch diameter ratio of about 35 times, and filler 7 is filled in a twisting gap between the three insulated wire cores, and the filled cable core is in a nearly complete round shape.
Each insulated wire core consists of a conductor 1, and a semiconductive conductor shielding layer 2, a polypropylene insulating layer 3, a semiconductive insulating shielding layer 4, a semiconductive buffer layer 5 and a metal shielding layer 6 which are sequentially coated outside the conductor 1 from inside to outside.
The conductor 1 is a stranded structure of tin-plated copper wires.
The polypropylene insulating layer 3 is an extrusion structure of polypropylene insulating material.
The semiconductive buffer layer 5 is an overlapped wrapping structure of semiconductive buffer strips with foaming structures inside, the overlapping wrapping superposition ratio is about 20%, and the thickness of the wrapped semiconductive buffer layer 5 is about 0.8mm.
The metal shielding layer 6 is a sparse winding structure of copper wires.
The filler 7 is a PP material.
The wrapping band layer 8 is an overlapped wrapping structure of a non-woven fabric band, and the overlapping wrapping overlapping rate is about 20%.
The oxygen barrier layer 9 is an extruded structure of polyethylene (including crosslinked polyethylene). A plurality of ridges protruding outwards from the outer wall are uniformly distributed on the circumference of the oxygen barrier layer 9, each ridge is of a structure with a narrow top and wide bottom in section, and the protruding height of each ridge is smaller than the coating thickness of the fireproof mud layer 10.
The fire-proof mud layer 10 is an extrusion structure of fire-proof mud, and the fire-proof mud layer 10 is extruded on the periphery of the oxygen-proof layer 9, so that each ridge on the outer wall of the oxygen-proof layer 9 is respectively embedded into the fire-proof mud layer 10, and the stable attachment of the low fire-proof mud layer 10 on the outer wall of the oxygen-proof layer 9 is ensured.
The inner glass fiber tape wrapping layer 11 is an overlapping wrapping structure of the glass fiber tape, and the overlapping wrapping overlapping rate is about 20%. The inner glass fiber tape forms binding and shaping for the fireproof mud layer 10 by wrapping the layer 11, and has buffering and flame-retarding effects.
The armor layer 12 is a sparse winding structure of steel belts on the outer wall of the inner glass fiber band winding layer 11.
The outer glass fiber tape wrapping layer 13 is an overlapping wrapping structure of the glass fiber tape, and the overlapping wrapping overlapping rate is about 20%. The outer glass fiber tape forms binding and shaping for the armor layer 12 around the cladding layer 13, and has buffering and flame-retardant effects.
The outer jacket layer 14 is an extruded structure of polyethylene (including crosslinked polyethylene).
Examples
The medium-voltage flame-retardant fire-resistant cable comprises a cable core with an insulating structure, and a wrapping layer, an oxygen-insulating layer, a fireproof mud layer, an inner glass fiber band wrapping layer, an armor layer, an outer glass fiber band wrapping layer and a sheath layer which are sequentially wrapped from inside to outside of the cable core.
Specifically, the cable core is formed by twisting three insulated wire cores at a pitch diameter ratio of about 50 times, filler is filled in twisting gaps of the three insulated wire cores, and the filled cable core is in a nearly complete round shape.
Each insulated wire core consists of a conductor, and a semiconductive conductor shielding layer, an insulating layer, a semiconductive insulating shielding layer, a semiconductive buffer layer and a metal shielding layer which are sequentially coated outside the conductor from inside to outside.
The conductor is of a stranded structure of aluminum alloy.
The insulating layer is an extrusion structure of polypropylene insulating material.
The semi-conductive buffer layer is of an overlapped wrapping structure of the semi-conductive buffer strip with a foaming structure inside, the overlapping wrapping superposition rate is about 20%, and the thickness of the wrapped semi-conductive buffer layer is about 0.5mm.
The metal shielding layer is a wrapping structure of copper strips.
The filler is a mixed material of PP and asbestos.
The wrapping band layer is an overlapped wrapping structure of the polypropylene band, and the overlapping wrapping overlapping rate is about 20%.
The oxygen isolation layer is an extrusion structure of polyvinyl chloride. The circumference at the oxygen barrier evenly has the protruding ridge of multichannel from outer wall outwards protruding, and every ridge is the cross-section and is the structure that top is narrow, bottom is wide, and the protruding height of every ridge is less than the cladding thickness of fire prevention mud layer.
The fire-proof mud layer is an extrusion structure of fire-proof mud, and the fire-proof mud layer is extruded on the periphery of the oxygen-isolation layer, so that each ridge on the outer wall of the oxygen-isolation layer is respectively embedded into the fire-proof mud layer, and the stable adhesion of the fire-proof mud layer on the outer wall of the oxygen-isolation layer is ensured.
The inner glass fiber tape wrapping layer is an overlapping wrapping structure of the glass fiber tape, and the overlapping wrapping overlapping rate is about 15%. The inner glass fiber tape forms binding and shaping for the fireproof mud layer around the cladding layer, and has buffering and flame-retarding effects.
The armor layer is a sparse winding structure of copper strips and inner glass fiber strips around the outer wall of the cladding.
The outer glass fiber tape wrapping layer is an overlapping wrapping structure of the glass fiber tape, and the overlapping wrapping overlapping rate is about 15%. The outer glass fiber tape forms binding and shaping for the armor layer around the cladding layer, and has buffering and flame-retardant effects.
The outer sheath layer is an extrusion structure of polyolefin plastic.
Examples
The medium-voltage flame-retardant fire-resistant cable comprises a cable core with an insulating structure, and a wrapping layer, an oxygen-insulating layer, a fireproof mud layer, an inner glass fiber band wrapping layer, an armor layer, an outer glass fiber band wrapping layer and a sheath layer which are sequentially wrapped from inside to outside of the cable core.
Specifically, the cable core is formed by twisting three insulated wire cores at a pitch diameter ratio of about 25 times, filler is filled in twisting gaps of the three insulated wire cores, and the filled cable core is in a nearly complete round shape.
Each insulated wire core consists of a conductor, and a semiconductive conductor shielding layer, an insulating layer, a semiconductive insulating shielding layer, a semiconductive buffer layer and a metal shielding layer which are sequentially coated outside the conductor from inside to outside.
The conductor is a stranded structure of aluminum alloy wires.
The insulating layer is an extrusion structure of polypropylene insulating material.
The semi-conductive buffer layer is of an overlapped wrapping structure of the semi-conductive buffer strip with a foaming structure inside, the overlapping wrapping superposition rate is about 20%, and the thickness of the wrapped semi-conductive buffer layer is about 0.3mm.
The metal shielding layer is of a wrapping structure of tinned copper strips.
The filler is PE and asbestos mixed material.
The wrapping band layer is an overlapped wrapping structure of the polyester band, and the overlapping wrapping overlapping rate is about 20%.
The oxygen barrier layer is an extruded structure of polyethylene (including crosslinked polyethylene). The circumference at the oxygen barrier evenly has the protruding ridge of multichannel from outer wall outwards protruding, and every ridge is the cross-section and is the structure that top is narrow, bottom is wide, and the protruding height of every ridge is less than the cladding thickness of fire prevention mud layer.
The fire-proof mud layer is an extrusion structure of fire-proof mud, and the fire-proof mud layer is extruded on the periphery of the oxygen-isolation layer, so that each ridge on the outer wall of the oxygen-isolation layer is respectively embedded into the fire-proof mud layer, and the stable adhesion of the fire-proof mud layer on the outer wall of the oxygen-isolation layer is ensured.
The inner glass fiber tape wrapping layer is an overlapping wrapping structure of the glass fiber tape, and the overlapping wrapping overlapping rate is about 25%. The inner glass fiber tape forms binding and shaping for the fireproof mud layer around the cladding layer, and has buffering and flame-retarding effects.
The armor layer is a sparse winding structure of copper wires (or steel wires, aluminum alloy wires and the like) on the outer wall of the inner glass fiber band winding cladding.
The outer glass fiber tape wrapping layer is an overlapping wrapping structure of the glass fiber tape, and the overlapping wrapping overlapping rate is about 20%. The outer glass fiber tape forms binding and shaping for the armor layer around the cladding layer, and has buffering and flame-retardant effects.
The outer sheath layer is an extrusion structure of polyolefin plastic.
Examples
The medium-voltage flame-retardant fire-resistant cable comprises a cable core with an insulating structure, and an oxygen isolation layer, a fire-proof mud layer, an inner glass fiber band wrapping layer, an armor layer, an outer glass fiber band wrapping layer and a sheath layer which are sequentially coated from inside to outside on the outer portion of the cable core.
Specifically, the cable core is an insulated wire core. The insulated wire core consists of a conductor, and a semi-conductive conductor shielding layer, a polypropylene insulating layer, a semi-conductive insulating shielding layer, a semi-conductive buffer layer and a metal shielding layer which are sequentially coated outside the conductor from inside to outside.
The conductor is a stranded structure of tinned copper wires.
The insulating layer is an extrusion structure of polypropylene insulating material.
The semi-conductive buffer layer is of an overlapped wrapping structure of the semi-conductive buffer strip with a foaming structure inside, the overlapping wrapping superposition rate is about 20%, and the thickness of the wrapped semi-conductive buffer layer is about 0.6mm.
The metal shielding layer is a wrapping structure of tinned copper wires.
The oxygen barrier layer is an extruded structure of polyethylene (including crosslinked polyethylene). The circumference at the oxygen barrier evenly has the protruding ridge of multichannel from outer wall outwards protruding, and every ridge is the cross-section and is the structure that top is narrow, bottom is wide, and the protruding height of every ridge is less than the cladding thickness of fire prevention mud layer.
The fire-proof mud layer is an extrusion structure of fire-proof mud, and the fire-proof mud layer is extruded on the periphery of the oxygen-isolation layer, so that each ridge on the outer wall of the oxygen-isolation layer is respectively embedded into the fire-proof mud layer, and the stable adhesion of the fire-proof mud layer on the outer wall of the oxygen-isolation layer is ensured.
The inner glass fiber tape wrapping layer is an overlapping wrapping structure of the glass fiber tape, and the overlapping wrapping overlapping rate is about 20%. The inner glass fiber tape forms binding and shaping for the fireproof mud layer around the cladding layer, and has buffering and flame-retarding effects.
The armor layer is an aluminum alloy belt and is in a sparse winding structure of an inner glass fiber belt around the outer wall of the cladding.
The outer glass fiber tape wrapping layer is an overlapping wrapping structure of the glass fiber tape, and the overlapping wrapping overlapping rate is about 25%. The outer glass fiber tape forms binding and shaping for the armor layer around the cladding layer, and has buffering and flame-retardant effects.
The outer sheath layer is an extrusion structure of polyethylene (containing crosslinked polyethylene).
The above examples are only intended to illustrate the present utility model, not to limit it.
Although the utility model has been described in detail with reference to the above embodiments, it will be understood by those of ordinary skill in the art that: it can be modified or some of the technical features can be replaced with equivalents; such modifications and substitutions do not depart from the spirit and scope of the utility model.
Claims (9)
1. The medium-voltage polypropylene insulation environment-friendly flame-retardant fire-resistant cable comprises a cable core, and an oxygen isolation layer (9), a fireproof mud layer (10) and a sheath layer (14) which are coated outside the cable core from inside to outside;
the cable core is provided with at least one insulated wire core;
the method is characterized in that:
the insulated wire core mainly comprises a conductor (1), and a semiconductive conductor shielding layer (2), a polypropylene insulating layer (3), a semiconductive insulating shielding layer (4), a semiconductive buffer layer (5) and a metal shielding layer (6) which are sequentially coated outside the conductor (1) from inside to outside.
2. The medium voltage polypropylene insulation environmental protection flame retardant fire resistant cable according to claim 1, wherein:
the cable core is provided with a plurality of insulating wire cores which are twisted together, and the twisting pitch diameter ratio of the insulating wire cores is 25-65 times;
and the stranding gaps of the cable core are filled with filler (7).
3. The medium voltage polypropylene insulation environmental protection flame retardant fire resistant cable according to claim 2, wherein:
the outside of the cable core is coated with a belting layer (8) positioned at the inner side of the oxygen isolation layer (9);
the wrapping belt layer (8) is a wrapping structure of a non-woven fabric belt, a polypropylene belt or a polyester belt.
4. The medium voltage polypropylene insulation environmental protection flame retardant fire resistant cable according to claim 1, wherein:
the semi-conductive buffer layer (5) is of an overlapped wrapping structure of a semi-conductive strip with a foaming structure inside;
the thickness of the semi-conductive buffer layer (5) is 0.2-0.8 mm.
5. The medium voltage polypropylene insulation environmental protection flame retardant fire resistant cable according to claim 1, wherein:
the oxygen isolation layer (9) is an extrusion structure of polyethylene, polyvinyl chloride or polyolefin plastic;
a plurality of ridges which are formed by protruding outwards from the outer wall are distributed on the circumference of the oxygen isolation layer (9), and the protruding height of each ridge is smaller than the cladding thickness of the fire-proof mud layer (10);
each ridge on the outer wall of the oxygen isolation layer (9) is respectively embedded into the fireproof mud layer (10).
6. The medium voltage polypropylene insulation environmental protection flame retardant fire resistant cable according to claim 1, wherein:
an armor layer (12) with a metal wrapping structure is arranged between the fireproof mud layer (10) and the sheath layer (14).
7. The medium voltage polypropylene insulation environmental protection flame retardant fire resistant cable according to claim 6, wherein:
an inner glass fiber tape wrapping layer (11) with a glass fiber tape overlapping wrapping structure is arranged between the fireproof mud layer (10) and the armor layer (12).
8. The medium voltage polypropylene insulation environmental protection flame retardant fire resistant cable according to claim 6, wherein:
an outer glass fiber tape wrapping layer (13) with a glass fiber tape overlapping wrapping structure is arranged between the sheath layer (14) and the armor layer (12).
9. The medium voltage polypropylene insulation environmental protection flame retardant fire resistant cable according to claim 1, wherein:
the sheath layer (14) is an extruded structure of polyethylene, polyvinyl chloride or polyolefin plastic.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321682197.2U CN220252903U (en) | 2023-06-29 | 2023-06-29 | Medium-voltage polypropylene insulation environment-friendly flame-retardant fire-resistant cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321682197.2U CN220252903U (en) | 2023-06-29 | 2023-06-29 | Medium-voltage polypropylene insulation environment-friendly flame-retardant fire-resistant cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220252903U true CN220252903U (en) | 2023-12-26 |
Family
ID=89271340
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321682197.2U Active CN220252903U (en) | 2023-06-29 | 2023-06-29 | Medium-voltage polypropylene insulation environment-friendly flame-retardant fire-resistant cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220252903U (en) |
-
2023
- 2023-06-29 CN CN202321682197.2U patent/CN220252903U/en active Active
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