CN221486180U - Single-phase crosslinked polyethylene insulation halogen-free low-smoke flame-retardant power cable for electrified railway - Google Patents
Single-phase crosslinked polyethylene insulation halogen-free low-smoke flame-retardant power cable for electrified railway Download PDFInfo
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- CN221486180U CN221486180U CN202323214193.4U CN202323214193U CN221486180U CN 221486180 U CN221486180 U CN 221486180U CN 202323214193 U CN202323214193 U CN 202323214193U CN 221486180 U CN221486180 U CN 221486180U
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Abstract
The utility model discloses a single-phase crosslinked polyethylene insulation halogen-free low-smoke flame-retardant power cable for an electrified railway, which relates to the technical field of electrified railway cables and specifically comprises the following components in parts by weight: a conductor; the insulating layer is wrapped on the outer side of the conductor and is three-layer; the composite shielding layer is arranged on the outer side of the insulating layer; the composite fire-proof layer is arranged outside the composite shielding layer; the armor layer is arranged on the outer side of the composite fire-proof layer; the outer protective layer is arranged on the outer side of the armor layer and is a rat-proof, termite-proof and ultraviolet-proof sheath layer. The utility model solves the technical problem that the flame retardant performance of the power cable for the electrified railway is insufficient.
Description
Technical Field
The utility model relates to the technical field of electrified railway cables, in particular to a single-phase crosslinked polyethylene insulation halogen-free low-smoke flame-retardant power cable for an electrified railway.
Background
At present, the design, construction and detection technology system of 350-380 km/h electrified railways is comprehensively mastered in China, the research and development and production technologies of high-speed railway contact net spare parts, high-strength high-conductivity contact net wires, GIS switches and automatic excessively equal high-speed railway key products are comprehensively mastered, and a China high-speed railway traction power supply technology system platform with complete independent intellectual property rights and the ascend world high-speed railway technology front edge are constructed. With the sustainable development of rail transportation industry in China, the coverage rate of electrified railways is wider and wider, and cables used for the electrified railways are increased, so that a large market space is brought, and the flame retardance of the existing power cable cannot reach the class A flame retardance grade.
Disclosure of utility model
The utility model aims to provide a single-phase crosslinked polyethylene insulation halogen-free low-smoke flame-retardant power cable for an electrified railway, which solves the technical problem of insufficient flame retardance of the power cable for the electrified railway in the prior art.
The embodiment of the application discloses a single-phase crosslinked polyethylene insulation halogen-free low-smoke flame-retardant power cable for an electrified railway, which comprises the following components:
a conductor;
The insulating layer is wrapped on the outer side of the conductor, and the insulating layer is three layers;
the composite shielding layer is arranged outside the insulating layer;
The composite fire-resistant layer is arranged outside the composite shielding layer;
the armor layer is arranged on the outer side of the composite fire-resistant layer;
The outer protection layer is arranged on the outer side of the armor layer, and the outer protection layer is a rat-proof, termite-proof and ultraviolet-proof sheath layer.
The application is provided with the composite fire-proof layer, which is used for improving the fire-retardant property of the product and improving the fire-retardant requirement of the product to meet the customer.
Based on the technical scheme, the embodiment of the application can be further improved as follows:
Further, the conductor is a round 2-class compressed copper conductor, and the compression coefficient of the conductor is not less than 0.9.
Further, the composite shielding layer includes:
The semi-conductive non-woven fabric layer is wound on the outer side of the insulating layer;
the copper wire shielding layer is wound on the outer side of the semiconductive non-woven fabric layer;
The copper strip shielding layer is wound on the outer side of the copper wire shielding layer, and the winding direction of the copper strip shielding layer is opposite to the winding direction of the copper wire shielding layer.
Further, the first high-flame-retardant wrapping band layer is arranged on the outer side of the composite shielding layer, and the beneficial effect of the step is that the flame retardant property can be achieved through the first high-flame-retardant wrapping band layer.
Further, the composite fire barrier includes:
the halogen-free low-smoke flame-retardant oxygen-isolating layer is arranged outside the first high flame retardance Bao Daiceng;
The halogen-free low-smoke flame-retardant isolation layer is arranged outside the halogen-free low-smoke flame-retardant oxygen isolation layer, and the beneficial effect of the step is that the flame retardant property can be further improved through a double-layer structure.
Further, the armor is a non-magnetic aluminum wire armor, and the beneficial effect of the adoption of the step is that the mechanical strength of the cable is improved through the armor, so that the physical and mechanical properties of the whole finished cable are ensured.
Further, the second high flame retardant belting layer is arranged on the outer side of the armor layer, and the beneficial effect of the adoption of the step is that the flame retardant performance can be further improved through the second high flame retardant belting layer.
One or more technical solutions provided in the embodiments of the present application at least have the following technical effects or advantages:
1. The application adopts the composite fire-proof structure to improve the high flame retardant property of the cable, so that the 27.5kV cable reaches the class A flame retardant grade.
2. The application has excellent mechanical property, anti-interference property, flame retardant property and radial water-blocking property, and the rat and termite resistance can reach level I.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a single-phase crosslinked polyethylene insulated halogen-free low-smoke flame-retardant power cable for an electrified railway according to an embodiment of the utility model;
1-conductors; 2-an insulating layer; 3-a composite shielding layer; 4-a composite fire barrier; 5-armor layer; 6-an outer sheath; 7-a second high flame retardance Bao Daiceng;
301-a semiconductive nonwoven layer; 302-a copper wire shielding layer; 303-a copper strip shielding layer; 304-a first high flame retardance Bao Daiceng;
401-a halogen-free low-smoke flame-retardant oxygen-insulating layer; 402-halogen-free low smoke flame retardant isolation layer.
Detailed Description
Embodiments of the technical scheme of the present utility model will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present utility model, and thus are merely examples, and are not intended to limit the scope of the present utility model.
It is noted that unless otherwise indicated, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this utility model belongs.
In the present utility model, unless explicitly stated and limited otherwise, the term "disposed" and the like should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be a mechanical connection; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
In order to better understand the above technical solutions, the following detailed description will refer to the accompanying drawings and specific embodiments.
Examples:
As shown in fig. 1, the embodiment of the application discloses a single-phase crosslinked polyethylene insulation halogen-free low-smoke flame-retardant power cable for an electrified railway, which improves the high flame retardant property of the cable by adopting a composite flame-retardant structure, achieves a class-A flame retardant level for the first time for a 27.5kV cable, and has excellent mechanical property, anti-interference property, flame retardant property and radial water-blocking property, and the rat and termite resistance reaches the level of class I;
The concrete structure comprises:
The conductor 1 is a copper core 2-type structure compression type round conductor, specifically, the compression coefficient of the conductor is not less than 0.9, so that the roundness of subsequent products is facilitated;
The insulation layer 2 is wrapped on the outer side of the conductor 1, the insulation layer 2 is three layers, and the insulation layer 2 is formed by co-extrusion of three layers of an ultra-smooth conductor shield, an insulation shielding material and an ultra-clean crosslinked polyethylene insulation material on the conductor, so that the overall insulation property can be ensured; during coextrusion, the eccentricity is controlled to be not more than 10%, so that the overall excellent physical and mechanical properties and electrical properties of the cable are ensured;
The composite shielding layer 3 is arranged on the outer side of the insulating layer 2, and the composite shielding layer 3 adopts semi-conductive non-woven fabrics, copper wire winding and soft copper belt reverse wrapping as a metal shielding layer of the cable so as to ensure that electric power transmission is not interfered by the outside in the running process of the electrified railway;
The composite fire-insulating layer 4 is arranged on the outer side of the composite shielding layer 3, and the composite fire-insulating layer 4 is of an extrusion-coated two-layer nonmetal oxygen-insulating structure to improve the high flame retardant property of the cable, so that the 27.5kV middle-high voltage cable reaches the class A flame retardant level for the first time;
The armor layer 5 is arranged on the outer side of the composite fire-resistant layer 4, and the armor layer 5 is wound by nonmagnetic aluminum wires so as to improve the mechanical strength of the cable and ensure the physical and mechanical properties of the whole finished cable;
The outer protection layer 6 is arranged on the outer side of the armor layer 5, the outer protection layer 6 is a rat-proof, termite-proof and ultraviolet-proof sheath layer, and the specific material formula is as follows (according to mass fraction): 65-70 parts of ethylene-vinyl acetate copolymer, 10-15 parts of ethylene-octyl copolymer, 9-16 parts of metallocene linear low-density polyethylene, 5-10 parts of linear low-density polyolefin grafted maleic anhydride, 0.5-1 part of composite antioxidant, 100-135 parts of aluminum hydroxide, 30-50 parts of magnesium hydroxide, 0.8-1.5 parts of light stabilizer and 1.4-3 parts of capsaicin; experiments prove that the cable has good ultraviolet-proof effect, and the level of the level I of the anti-rat and anti-termite cable can be achieved.
In one embodiment, the conductor 1 is a round 2-class compressed copper conductor, and the compression coefficient of the conductor 1 is not less than 0.9, so as to ensure the whole roundness.
Wherein the composite shielding layer 3 comprises:
A semiconductive nonwoven fabric layer 301 wound around the outside of the insulating layer 2;
A copper wire shielding layer 302 wound around the outer side of the semiconductive non-woven fabric layer;
the copper strip shielding layer 303 is wound on the outer side of the copper wire shielding layer 302, and the winding direction of the copper strip shielding layer 303 is opposite to that of the copper wire shielding layer 302, so that the shielding performance can be further improved through the multi-layer shielding layer, and the electric power transmission is prevented from being interfered by the outside in the operation process of the electrified railway.
In yet another embodiment, the first high flame retardant Bao Daiceng 304,304 is disposed on the outer side of the composite shielding layer 3, and the flame retardant performance of the finished product can be further improved by the first high flame retardant belting layer 304.
In order to achieve a 27.5kV cable reaching a class a flame retardant rating, a composite fire barrier 4 is therefore designed, the composite fire barrier 4 comprising:
The halogen-free low-smoke flame-retardant oxygen-insulating layer 401 is arranged outside the first high flame retardance Bao Daiceng 304,304;
A halogen-free low-smoke flame-retardant isolation layer 402 disposed outside the halogen-free low-smoke flame-retardant oxygen-barrier layer 401; the application adopts a double-layer technology, utilizes a two-layer nonmetallic oxygen-isolation structure as a composite flame-retardant layer to improve the high flame-retardant performance of the cable, and realizes the class A flame-retardant level of the 27.5kV medium-high voltage cable for the first time.
In yet another embodiment, the armor layer 5 is a non-magnetic aluminum wire armor layer, so that the overall mechanical performance of the product can be improved.
Wherein, the armor 5 outside is provided with second high fire-retardant band layer 7, and this second high fire-retardant band layer 7 is specifically located between armor 5 and outer sheath 6 to this fire-retardant performance that can improve the product.
In the description of the present utility model, numerous specific details are set forth. However, it is understood that embodiments of the utility model may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model, and are intended to be included within the scope of the appended claims and description.
Claims (7)
1. The utility model provides a single-phase crosslinked polyethylene insulation does not have steamed low fire-retardant power cable of cigarette for electric railway which characterized in that includes:
a conductor;
The insulating layer is wrapped on the outer side of the conductor, and the insulating layer is three layers;
the composite shielding layer is arranged outside the insulating layer;
The composite fire-resistant layer is arranged outside the composite shielding layer;
the armor layer is arranged on the outer side of the composite fire-resistant layer;
The outer protection layer is arranged on the outer side of the armor layer, and the outer protection layer is a rat-proof, termite-proof and ultraviolet-proof sheath layer.
2. The single-phase crosslinked polyethylene insulated halogen-free low-smoke flame-retardant power cable for electrified railways according to claim 1, wherein the conductor is a round type 2 compacted copper conductor and the compaction coefficient of the conductor is not less than 0.9.
3. The single-phase crosslinked polyethylene insulated halogen-free low-smoke flame-retardant power cable for an electrified railway of claim 1, wherein the composite shielding layer comprises:
The semi-conductive non-woven fabric layer is wound on the outer side of the insulating layer;
the copper wire shielding layer is wound on the outer side of the semiconductive non-woven fabric layer;
And the copper strip shielding layer is wound on the outer side of the copper wire shielding layer, and the winding direction of the copper strip shielding layer is opposite to that of the copper wire shielding layer.
4. The single-phase crosslinked polyethylene insulated halogen-free low-smoke flame-retardant power cable for an electrified railway according to claim 3, wherein a first high flame-retardant wrapping tape layer is arranged on the outer side of the composite shielding layer.
5. The single-phase crosslinked polyethylene insulated halogen-free low-smoke, flame-retardant power cable for an electrified railway of claim 4, wherein the composite flame-retardant layer comprises:
the halogen-free low-smoke flame-retardant oxygen-isolating layer is arranged outside the first high flame retardance Bao Daiceng;
The halogen-free low-smoke flame-retardant isolation layer is arranged outside the halogen-free low-smoke flame-retardant oxygen isolation layer.
6. The single-phase crosslinked polyethylene insulated halogen-free low-smoke flame-retardant power cable for an electrified railway according to claim 1, wherein the armor layer is a non-magnetic aluminum wire armor layer.
7. The single-phase crosslinked polyethylene insulated halogen-free low-smoke flame-retardant power cable for an electrified railway according to claim 1, wherein a second high flame-retardant wrapping tape layer is arranged on the outer side of the armor layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323214193.4U CN221486180U (en) | 2023-11-28 | 2023-11-28 | Single-phase crosslinked polyethylene insulation halogen-free low-smoke flame-retardant power cable for electrified railway |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323214193.4U CN221486180U (en) | 2023-11-28 | 2023-11-28 | Single-phase crosslinked polyethylene insulation halogen-free low-smoke flame-retardant power cable for electrified railway |
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| Publication Number | Publication Date |
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| CN221486180U true CN221486180U (en) | 2024-08-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202323214193.4U Active CN221486180U (en) | 2023-11-28 | 2023-11-28 | Single-phase crosslinked polyethylene insulation halogen-free low-smoke flame-retardant power cable for electrified railway |
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| CN (1) | CN221486180U (en) |
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