CN218447350U - Environment-friendly medium-voltage fireproof power cable - Google Patents
Environment-friendly medium-voltage fireproof power cable Download PDFInfo
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- CN218447350U CN218447350U CN202222640881.6U CN202222640881U CN218447350U CN 218447350 U CN218447350 U CN 218447350U CN 202222640881 U CN202222640881 U CN 202222640881U CN 218447350 U CN218447350 U CN 218447350U
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Abstract
The utility model discloses an environmental protection middling pressure fire prevention power cable belongs to fireproof cable, the utility model discloses the technical problem that solves is that the fire-resistant safety rating of how to improve middling pressure fireproof cable is high, and the installation of being convenient for is laid, and reduce cost simultaneously, the technical scheme of adoption is: the high-flame-retardant cable core comprises a cable core, a high-flame-retardant wrapping band layer, an oxygen-insulating layer, an alkali-free glass fiber winding wrapping band layer I, a fire-insulating layer, an alkali-free glass fiber winding wrapping band layer II, an armor layer, an alkali-free glass fiber winding wrapping band layer III and an outer sheath layer which are sequentially arranged from inside to outside, wherein the high-flame-retardant wrapping band layer is wrapped outside the cable core, the oxygen-insulating layer is wrapped outside the high-flame-retardant wrapping band layer, the alkali-free glass fiber winding wrapping band layer I is wrapped outside the oxygen-insulating layer, the fire-insulating layer is wrapped outside the alkali-free glass fiber winding wrapping band layer I, the fire-insulating layer is wrapped outside the alkali-free glass fiber winding wrapping band layer II, the armor layer is wrapped outside the alkali-free glass fiber winding band layer III, and the alkali-free glass fiber winding band layer III is wrapped outside the outer sheath layer.
Description
Technical Field
The utility model relates to a fireproof cable, specifically speaking are fire prevention power cable of environmental protection middling pressure.
Background
The fireproof cable is widely applied to places such as high-rise buildings, hotels and restaurants, hospitals, schools, business centers, logistics warehouses, airports, stations, ports, subways, coal, petrochemical industry, fire prevention, explosion prevention, high temperature and the like. Due to the rapid development of national economic construction, the use of a large amount of power and energy utilization facilities leads to the multiplied increase of power load. If important places such as high-rise buildings and super high-rise buildings adopt low-voltage fire-resistant cables of 1kV and below for power distribution, the cable consumption and the workload of laying and installation are increased by dozens of times compared with the common cable consumption and the workload of laying and installation, the cable laying space is also increased by several times, the material consumption and the energy consumption are both consumed, and the fire hazard can be brought because the cables are laid too much and too dense in the buildings. With the increasingly mature research and development and processing technology of the medium-voltage fire-resistant cable, meanwhile, more and more attention is paid to fire safety and the fire safety awareness of people is continuously improved, the medium-voltage fire-resistant cable can be widely applied to power distribution systems in important places such as high-rise buildings and super high-rise buildings, and the market space is immeasurable.
At present, medium-voltage fireproof cables in the market generally have the defects that the fire-resistant time is too short, and the enough rescue time cannot be provided; the outer diameter of the cable is too large, so that the installation and the laying are difficult; the cable price is too high and the market acceptance is limited. So how to improve medium voltage fireproof cable's fire-resistant safety level height, be convenient for install and lay, reduce cost is the technical problem who awaits the solution at present.
Disclosure of Invention
The technical task of the utility model is to provide an environmental protection middling pressure fire prevention power cable, solve the fire-resistant safety class height that how to improve middling pressure fire prevention cable, be convenient for install and lay, reduce cost's problem simultaneously.
The technical task of the utility model is realized according to following mode, an environmental protection middling pressure fire prevention power cable, include the cable core that from interior to exterior set gradually, high fire-retardant band layer, separate the oxygen layer, the fine winding band layer one of alkali-free glass, separate the fire layer, the fine winding band layer two of alkali-free glass, the armor, the fine winding band layer three of alkali-free glass and oversheath layer, the outside parcel of cable core has high fire-retardant band layer, the outside parcel in high fire-retardant band layer has a separate the oxygen layer, separate the outside parcel in oxygen layer and have the fine winding band layer one of alkali-free glass, the fine outside parcel in alkali-free glass has a fire layer around the outside parcel in band layer, it has the fine winding band layer two of alkali-free glass to separate the outside parcel in fire layer, the fine outside parcel in alkali-free glass has the armor of alkali-free glass, armor outside armor is including the fine winding band layer three of alkali-free glass, the three outsides in alkali-free winding band layer are including the oversheath layer.
Preferably, the cable core comprises at least three wire cores which are distributed circumferentially, and a cabling filling layer is arranged in a cavity between each wire core and the high flame-retardant belting layer.
More preferably, the sinle silk includes that from interior to exterior sets gradually conductor layer, conductor shield, insulating layer, insulation shielding layer, semi-conductive buffering block water belt layer and metallic shield layer, and the outside parcel of conductor layer has the conductor shield, and the outside parcel of conductor shield has the insulating layer, and the outside parcel of insulating layer has the insulation shielding layer, and the outside parcel of insulation shielding layer has the metallic shield layer including semi-conductive buffering block water belt layer, and semi-conductive buffering block water belt layer outside parcel has the metallic shield layer.
Preferably, the conductor layer is a class 2 multi-strand stranded copper conductor, so that the cable has certain flexibility;
the conductor shielding layer is a polypropylene semi-conductive shielding layer, is uniformly coated on the conductor layer, has a smooth surface, does not have particles, scorched or scratched traces, and has a thickness of 0.6-0.7 mm.
Preferably, the insulating layer is an environment-friendly modified polypropylene (PP) insulating layer, the long-term working temperature of the environment-friendly modified polypropylene (PP) insulating layer can reach 105 ℃, and the environment-friendly modified polypropylene (PP) insulating layer has the characteristics of high temperature resistance level, high breakdown field strength, small change of dielectric constant and dielectric loss along with temperature, superior mechanical property and the like;
the insulation shielding layer is extruded by polypropylene semi-conductive outer shielding material, the surface of the semi-conductive shielding layer is smooth, no particle, scorch or scratch mark is caused, and the thickness of the insulation shielding layer is 0.5-0.6 mm.
Preferably, the semi-conductive buffer water blocking tape layer adopts a semi-conductive buffer tape with a wrapping thickness of 2mm, and can play a role in uniform electric field, buffering and shielding;
the metal shielding layer adopts a copper strip shielding layer or a copper wire shielding layer, and a metal shielding structure is determined according to the cable ground fault cable;
the cabling filling layer adopts a flame-retardant high-temperature filling rope, and high-flame-retardant belt wraps the cabling layer.
Preferably, the oxygen isolation layer is extruded by adopting a halogen-free low-smoke flame-retardant polyolefin oxygen isolation layer with an oxygen index of more than 45, the thickness of the oxygen isolation layer is 4-5 mm, and a first alkali-free glass fiber winding wrapping tape layer is lapped and wrapped behind the oxygen isolation layer.
Preferably, the fire barrier layer is extruded by adopting a ceramic polyolefin sheath material, the thickness of the fire barrier layer is 4-5 mm, and an alkali-free glass fiber winding belt layer II is lapped and wound after the fire barrier layer is extruded.
Preferably, the armor layer is made of steel belts or steel wires, and an alkali-free glass fiber wrapping tape layer III is wrapped after armor.
Preferably, the outer sheath layer is a halogen-free low-smoke flame-retardant polyolefin sheath layer.
The utility model discloses an environmental protection middling pressure fire prevention power cable has following advantage:
the utility model improves the fire-resistant safety level of the medium-voltage fireproof cable, is convenient to install and lay, and reduces the cost;
the utility model improves the cable structure, adopts the environment-friendly modified polypropylene insulating layer, the semi-conductive buffering water-blocking belt layer, the cabling filling layer, the flame-retardant cooling oxygen-insulating layer and the fire-insulating layer multiple protection structure, and avoids the phenomenon that the insulation is affected by fire to cause thermal breakdown under the condition of fire;
compared with the existing medium-voltage fire-resistant cable, the utility model not only ensures the fire resistance of the product, but also ensures that the product is not over-designed, thereby reducing the comprehensive cost; simultaneously the utility model has the advantages of light in weight, the external diameter is little, comprehensive cost is low, green, be convenient for install and lay.
The utility model has the characteristics of reasonable in design, simple structure, easily processing, small, convenient to use, a thing is multi-purpose etc, therefore, has fine popularization and use value.
Drawings
The present invention will be further explained with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of an environment-friendly medium-voltage fireproof power cable.
In the figure: 1. conductor layer, 2, conductor shielding layer, 3, insulating layer, 4, insulating shielding layer, 5, semiconduction buffering band layer that blocks water, 6, metal shielding layer, 7, cabling filling layer, 8, high fire-retardant band layer, 9, separate the oxygen layer, 10, alkali-free glass fibre wind band layer one, 11, separate the fire layer, 12, alkali-free glass fibre wind band layer two, 13, armor, 14, alkali-free glass fibre wind band layer three, 15, oversheath layer.
Detailed Description
The environment-friendly medium-voltage fireproof power cable of the invention is described in detail below with reference to the drawings and specific embodiments of the specification.
In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and for simplification of description. And are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation and are therefore not to be considered limiting of the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example (b):
as shown in fig. 1, the embodiment provides an environment-friendly medium-voltage fireproof power cable, which structurally comprises a cable core, a high-flame-retardant belting layer 8, an oxygen-barrier layer 9, an alkali-free glass fiber wrapped belting layer I10, a fire-barrier layer 11, an alkali-free glass fiber wrapped belting layer II 12, an armor layer 13, an alkali-free glass fiber wrapped belting layer III 14 and an outer sheath layer 15, wherein the high-flame-retardant belting layer 8 is wrapped outside the cable core, the oxygen-barrier layer 9 is wrapped outside the high-flame-retardant belting layer 8, the alkali-free glass fiber wrapped belting layer I10 is wrapped outside the oxygen-barrier layer 9, the alkali-free glass fiber wrapped belting layer I10 is wrapped outside the alkali-free glass fiber wrapped belting layer I10, the fire-barrier layer 11 is wrapped outside the alkali-free glass fiber wrapped belting layer II 12, the alkali-free glass fiber wrapped armor layer III 12 is wrapped outside the armor layer 13, the alkali-free glass fiber wrapped armor layer III 14 is included outside the armor layer 13, and the alkali-free glass fiber wrapped belting layer III 14 includes the outer sheath layer 15 outside the alkali-free glass wrapped belting layer III.
The cable core in this embodiment includes three sinle silk that are circumference distribution, and the cavity intussuseption between sinle silk and the high fire-retardant band layer is filled with stranding filling layer 7.
The sinle silk in this embodiment includes conductor layer 1, conductor shield 2, insulating layer 3, insulating shield 4, semiconduction buffering water blocking tape layer 5 and metallic shield 6 that from interior to exterior set gradually, and conductor layer 1 outside parcel has conductor shield 2, and conductor shield 2 outside parcel has insulating layer 3, and insulating layer 3 outside parcel has insulating shield 4, and insulating shield 4 is outside including semiconduction buffering water blocking tape layer 5, and semiconduction buffering water blocking tape layer 5 outside parcel has metallic shield 6.
The conductor layer 1 in this embodiment is made of a category 2 stranded copper conductor, so that the cable has certain flexibility.
The conductor shielding layer 2 in this embodiment is a polypropylene semiconductive shielding layer, which is uniformly coated on the conductor layer, has a smooth surface, and is free from particles, scorching or scratching marks, and has a thickness of 0.6-0.7 mm.
The insulating layer 3 in the embodiment adopts an environment-friendly modified polypropylene (PP) insulating layer, the long-term working temperature of the environment-friendly modified PP insulating layer can reach 105 ℃, and the environment-friendly modified PP insulating layer has the characteristics of high temperature resistance level, high breakdown field intensity, small temperature-dependent change of dielectric constant and dielectric loss, superior mechanical property and the like.
The insulating layer 3 in this embodiment is made of an environment-friendly modified polypropylene insulating material resistant to decomposition at high temperature, compared with a conventional crosslinked polyethylene insulating material:
firstly, the polypropylene insulation is a thermoplastic material, a cross-linking process is not needed, the processing process is simplified, the production efficiency is improved, the energy consumption is reduced, and meanwhile, the polypropylene insulation can be repeatedly utilized and accords with the safe and environment-friendly concept;
secondly, the polypropylene insulation density is 0.90g/cm 3 The crosslinked polyethylene insulation density is 0.923g/cm 3 Tests show that the polypropylene insulation breakdown field strength is higher than that of crosslinked polyethylene insulation, the polypropylene insulation thickness is thinner under the condition of the same voltage class, the polypropylene insulation cable is lighter in weight, smaller in outer diameter and lower in comprehensive cost under the condition of the same type and specification;
finally, the long-term working temperature of the polypropylene insulation is 110-115 ℃, the long-term using temperature of the crosslinked polyethylene insulation is 95-100 ℃, the thermal decomposition temperature of the polypropylene is greater than 350 ℃, the thermal decomposition temperature of the crosslinked polyethylene is not more than 300 ℃, tests show that when the temperature of the crosslinked polyethylene exceeds 250 ℃, breakdown is easy to generate, the thermal breakdown temperature of the polypropylene insulation is higher than 300 ℃, the polypropylene insulation has higher working temperature and thermal breakdown temperature relative to the crosslinked polyethylene insulation, the polypropylene insulation is suitable for fire-resistant cables, and in fire occasions, the polypropylene insulation has higher safety boundary, is not easy to generate thermal breakdown, and maintains the normal power supply time of a circuit longer; due to the improvement of the insulation temperature-resistant grade, the heat-resistant breakdown capacity of the cable is improved, so that the thickness and the number of layers of subsequent fire-resistant layers are reduced, meanwhile, the consumption of subsequent materials is reduced due to the reduction of the insulation thickness, the fire resistance of the cable is ensured, and the comprehensive cost is reduced;
in a word, the environment-friendly modified polypropylene is used as the insulation of the medium-voltage fire-resistant cable, and has the characteristics of high heat-resistant grade, environmental protection, high production efficiency, low comprehensive cost and the like.
In this embodiment, the insulation shielding layer 4 is extruded by a polypropylene semiconductive outer shielding material, the polypropylene semiconductive shielding layer has a smooth surface and is free from particles, scorching or scratching marks, and the thickness of the insulation shielding layer 4 is 0.5-0.6 mm.
Semi-conductive buffering band layer 5 in this embodiment adopts the semi-conductive buffering area that is 2mm around package thickness, can play even electric field, buffering, shielding effect. The semi-conductive buffer water-blocking belt layer 5 is located between the insulating shielding layer 4 and the metal shielding layer 6, the main function is that the insulating layer is protected from being damaged, when the fire occurs, the metal shielding layer is heated to expand, the insulating shielding layer and the insulating layer are easily cut, and the semi-conductive buffer water-blocking belt layer is added to further protect the insulating layer.
In this embodiment, the metal shielding layer 6 is a copper tape shielding layer or a copper wire shielding layer, and the metal shielding structure is determined according to the cable ground fault cable.
The cabling filling layer 7 in the embodiment adopts a flame-retardant high-temperature filling rope, and a high-flame-retardant belting layer 8 is wrapped after cabling, so that the functions of flame retardance and heat insulation are achieved, meanwhile, the cabling filling layer has the characteristics of high temperature resistance, super softness, light specific gravity, high strength and the like, does not contain harmful substances such as halogen, asbestos and the like, is used for halogen-free medium-voltage cables, has the diameter of more than 6mm, and is generally 1/3-1/4 of the dosage of similar products.
The oxygen-insulating layer 9 in the embodiment is extruded by adopting a halogen-free low-smoke flame-retardant polyolefin oxygen-insulating layer material with an oxygen index of more than 45, the thickness of the oxygen-insulating layer 9 is 4-5 mm, and a first alkali-free glass fiber wrapping tape 10 is lapped behind the oxygen-insulating layer 9. Wherein, separate oxygen layer 9 and adopt crowded package halogen-free low smoke flame retardant polyolefin material, crowded package halogen-free low smoke flame retardant polyolefin meets fire, decomposes into metallic oxide and separates out crystal water under high temperature, metallic oxide forms network structure after decomposing, has certain adsorption to the flue gas, and the crystal water that separates out not only plays obvious settlement effect to the tobacco grain, but also has better heat absorption effect, postpone the burning rate and the sharp rising temperature of cable, the material does not contain halogen and the smog that produces in the combustion process is less simultaneously, has advantages such as reduction environmental pollution.
The fire-proof layer 11 in this embodiment adopts the crowded package of ceramic polyolefin sheath material, and the thickness of fire-proof layer 11 is 4 ~ 5mm, overlaps behind the crowded package fire-proof layer 11 to wrap alkali-free glass fiber around band two 12. The fire insulation layer 11 is made of extruded ceramic polyolefin material, and a ceramic shell generated by burning the ceramic polyolefin does not crack or drip, so that the ceramic shell has excellent electrical isolation performance and excellent oxygen insulation and heat insulation effects. The fire-resistant heat-insulating layer structure can effectively isolate the infringement of high-temperature flame to the interior of the circuit, delays the decomposition of internal materials, avoids the fusing of a conductor in the flame and ensures the smoothness of the circuit under the fire disaster condition. Meanwhile, compared with the existing ceramic silicon rubber and ceramic silicon rubber composite belt, the ceramic polyolefin raw material has two outstanding advantages. Firstly, the process for manufacturing the electric wire and the cable is simplified, vulcanization is not needed, and the efficiency is greatly improved; secondly, the cost can be reduced by about 30 percent.
The armor layer 13 in this embodiment is made of steel tape or steel wire, and a third alkali-free glass fiber winding tape layer 14 is wound after armor.
This embodiment adopts alkali-free glass fiber to wind band layer one 10 after separating oxygen layer 9, adopt alkali-free glass fiber to wind band layer two 12 after separating fire layer 11, adopt alkali-free glass fiber to wind band layer three 14 after armor 13, the primary action lies in that the protection separates oxygen layer and flame retardant coating, because thermoplastic material has certain mobility when being heated, when supplying fire, supply fire side thickness can the attenuate, and can play the effect that the protection separates oxygen layer 9 and separates fire layer 11 around the glass fiber of package, the extension separates fire layer 11's refractory time, band itself also plays simultaneously and separates fire, fire-retardant effect.
In this embodiment, the outer sheath layer 15 is made of a halogen-free low-smoke flame-retardant polyolefin sheath layer.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (10)
1. The environment-friendly medium-pressure fireproof power cable is characterized by comprising a cable core, a high-flame-retardant wrapping tape layer, an oxygen barrier layer, a first alkali-free glass fiber winding wrapping tape layer, a fire barrier layer, a second alkali-free glass fiber winding wrapping tape layer, an armor layer, a third alkali-free glass fiber winding wrapping tape layer and an outer sheath layer which are sequentially arranged from inside to outside, wherein the high-flame-retardant wrapping tape layer is wrapped outside the cable core, the oxygen barrier layer is wrapped outside the high-flame-retardant wrapping tape layer, the first alkali-free glass fiber winding wrapping tape layer is wrapped outside the oxygen barrier layer, the fire barrier layer is wrapped outside the first alkali-free glass fiber winding wrapping tape layer, the second alkali-free glass fiber winding tape layer is wrapped outside the fire barrier layer, the armor layer comprises the third alkali-free glass fiber winding wrapping tape layer, and the outer sheath layer is wrapped outside the third alkali-free glass fiber winding tape layer.
2. The environment-friendly medium-voltage fireproof power cable according to claim 1, wherein the cable core comprises at least three circumferentially distributed wire cores, and a cabling filling layer is arranged in a cavity between the wire cores and the high-flame-retardant belting layer.
3. The environment-friendly medium-voltage fireproof power cable according to claim 2, wherein the wire core comprises a conductor layer, a conductor shielding layer, an insulating shielding layer, a semiconductive buffering water-blocking tape layer and a metal shielding layer which are sequentially arranged from inside to outside, the conductor shielding layer is wrapped outside the conductor layer, the insulating layer is wrapped outside the conductor shielding layer, the insulating layer is wrapped outside the insulating shielding layer, the semiconductive buffering water-blocking tape layer is wrapped outside the insulating shielding layer, and the metal shielding layer is wrapped outside the semiconductive buffering water-blocking tape layer.
4. The environmentally friendly medium voltage fireproof power cable of claim 3, wherein the conductor layer is a class 2 stranded copper conductor;
the conductor shielding layer is a polypropylene semi-conductive shielding layer, and the thickness of the conductor shielding layer is 0.6-0.7 mm.
5. The environment-friendly medium-voltage fireproof power cable according to claim 3, wherein the insulating layer is an environment-friendly modified polypropylene insulating layer;
the insulation shielding layer is extruded by polypropylene semi-conductive outer shielding material, and the thickness of the insulation shielding layer is 0.5-0.6 mm.
6. The environment-friendly medium-voltage fireproof power cable according to claim 3, wherein the semi-conductive buffering water-blocking tape layer is a semi-conductive buffering tape with a wrapping thickness of 2 mm;
the metal shielding layer adopts a copper strip shielding layer or a copper wire shielding layer;
the cabling filling layer adopts a flame-retardant high-temperature filling rope.
7. The environment-friendly medium-voltage fireproof power cable according to claim 1, wherein the oxygen-barrier layer is extruded with a halogen-free low-smoke flame-retardant polyolefin oxygen-barrier layer with an oxygen index of 45 or more, and the thickness of the oxygen-barrier layer is 4-5 mm.
8. The environment-friendly medium-voltage fireproof power cable according to claim 1, wherein the fire barrier layer is extruded by a ceramic polyolefin sheath material, and the thickness of the fire barrier layer is 4-5 mm.
9. The environmentally friendly medium voltage fireproof power cable of claim 1, wherein the armor layer is made of steel tape or steel wire.
10. The environment-friendly medium-voltage fireproof power cable according to claim 1, wherein the outer sheath layer is a halogen-free low-smoke flame-retardant polyolefin sheath layer.
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| CN202222640881.6U CN218447350U (en) | 2022-10-09 | 2022-10-09 | Environment-friendly medium-voltage fireproof power cable |
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| CN202222640881.6U CN218447350U (en) | 2022-10-09 | 2022-10-09 | Environment-friendly medium-voltage fireproof power cable |
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| CN218447350U true CN218447350U (en) | 2023-02-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115924656A (en) * | 2023-03-15 | 2023-04-07 | 天津北达线缆集团有限公司 | Assembled medium-voltage flexible cable |
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2022
- 2022-10-09 CN CN202222640881.6U patent/CN218447350U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115924656A (en) * | 2023-03-15 | 2023-04-07 | 天津北达线缆集团有限公司 | Assembled medium-voltage flexible cable |
| CN115924656B (en) * | 2023-03-15 | 2023-05-16 | 天津北达线缆集团有限公司 | Assembled medium-voltage flexible cable |
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