CN113035429B - Flame-retardant communication cable - Google Patents
Flame-retardant communication cable Download PDFInfo
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- CN113035429B CN113035429B CN202110175720.1A CN202110175720A CN113035429B CN 113035429 B CN113035429 B CN 113035429B CN 202110175720 A CN202110175720 A CN 202110175720A CN 113035429 B CN113035429 B CN 113035429B
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- insulating layer
- protective layer
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- sheath material
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
- H01B7/295—Protection against damage caused by extremes of temperature or by flame using material resistant to flame
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B11/00—Communication cables or conductors
- H01B11/02—Cables with twisted pairs or quads
- H01B11/06—Cables with twisted pairs or quads with means for reducing effects of electromagnetic or electrostatic disturbances, e.g. screens
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/02—Disposition of insulation
- H01B7/0275—Disposition of insulation comprising one or more extruded layers of insulation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
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- Electromagnetism (AREA)
- Insulated Conductors (AREA)
Abstract
The invention discloses a flame-retardant communication cable, which relates to the technical field of cables and comprises the following components: the device comprises three groups of high-frequency four-wire groups, four groups of low-frequency four-wire groups, a first insulating layer, three groups of signal twisted pairs, a second insulating layer, a filler, a first water blocking belt, an inner sheath and a sheath material, wherein the first insulating layer is wrapped outside the high-frequency four-wire groups and the low-frequency four-wire groups, the second insulating layer wraps the signal twisted pairs, and the second insulating layer adopts an extruded polyolefin solid insulating structure; the first water-blocking tape wraps three groups of first insulating layers and second insulating layers; filling a gap formed between the first water blocking tape and the first and second insulating layers with a filler; the inner sheath is arranged at the periphery of the first water blocking belt; the sheath material is arranged at the periphery of the inner sheath, and the sheath material is B1-level halogen-free flame-retardant sheath material. The cable sheath material adopts the special B1-level halogen-free low-smoke flame-retardant sheath material, so that the smoke quantity and the combustion heat of the cable are reduced, and the flame-retardant grade of the cable is improved.
Description
Technical Field
The invention relates to the technical field of cables, in particular to a flame-retardant communication cable.
Background
With the increasing of railway construction and high-speed rail opening operation, the increasing of new operation mileage and the continuous expansion of network scale, the increasing of railway driving safety pressure and challenges are increasing, and in the past, the domestic railway is classified into A, B, C, D and the like according to GB/T19666-2005 general rules for flame retardant and fire-resistant wires and cables. The high-low frequency long-distance symmetrical communication cable refers to the TB/T1478 railway long-distance communication cable system series, the main technical condition standard and the railway communication standard, only the requirement that the flame retardant grade is C type is specified, and the common C type flame retardant cable can not meet the requirement of the railway long-distance symmetrical communication cable along with the improvement of the safety consciousness of people.
Disclosure of Invention
Accordingly, the present invention is directed to a flame retardant communication cable for improving the flame retardant rating of the cable.
Based on the above object, the present invention provides a flame retardant communication cable, comprising:
three high-frequency four-wire sets, four low-frequency four-wire sets, a first insulating layer, three signal twisted pairs, a second insulating layer, a filler, a first water-blocking belt, an inner sheath and a sheath material, wherein,
the high-frequency four-wire set and the low-frequency four-wire set are formed by actively paying off left-hand pre-twisting four insulated wire cores of red, green, white and blue;
the first insulating layer is wrapped outside the high-frequency four-wire set and the low-frequency four-wire set, and is formed by physically foaming and insulating extruded polyolefin skin-bubble-skin;
the second insulating layer wraps the signal pair twisting group, and the second insulating layer adopts an extruded polyolefin solid insulating structure;
the first water blocking tape wraps three groups of the first insulating layer and the second insulating layer;
the filler fills a gap formed between the first water blocking tape and the first and second insulating layers;
the inner sheath is arranged at the periphery of the first water blocking belt;
the sheath material is arranged on the periphery of the inner sheath, and the sheath material is B1-level halogen-free flame-retardant sheath material.
Optionally, the first water blocking tape is wrapped with a heat insulating layer.
Optionally, a second water blocking tape is wrapped outside the heat insulating layer.
Optionally, the outer part of the second water blocking belt is longitudinally wrapped and welded to form an aluminum sheath.
Optionally, the outer surface of the aluminum sheath is coated with an anti-corrosion layer.
Optionally, a steel tape armor is arranged between the inner sheath and the sheath material.
Optionally, an aluminum alloy protective sleeve is arranged outside the sheath material.
Optionally, the protective sheath includes first protective layer and second protective layer, be equipped with the arch on the first protective layer, have the recess on the second protective layer, first protective layer with the second protective layer is in the same place through protruding and the cooperation detachable connection of recess, first protective layer with the one end of second protective layer is formed with the notch, and another section is formed with the projection, two pass through between the protective sheath the notch with the projection can dismantle the connection, have the gas pocket on the second protective layer.
Optionally, a deflector is arranged above the air hole.
The cable sheath material adopts the special B1-level halogen-free low-smoke flame-retardant sheath material, reduces the smoke quantity and combustion heat of the cable, has the characteristics of no halogen, low smoke, flame retardance, low toxicity and the like, and simultaneously has low total heat emission amount and small combustion carbonization height when being combusted, thereby greatly improving the safety of the railway long-distance symmetrical communication cable in a sealed environment. The high-frequency four-wire set adopts a physical foaming insulation shielding structure of extruded polyolefin skin-bubble-skin, so that the communication quality in the transmission process is improved.
Drawings
For a clearer description of one or more embodiments of the present description or of the solutions of the prior art, the drawings that are necessary for the description of the embodiments or of the prior art will be briefly described, it being apparent that the drawings in the description below are only one or more embodiments of the present description, from which other drawings can be obtained, without inventive effort, for a person skilled in the art.
FIG. 1 is a schematic view of a cable according to an embodiment of the present invention;
fig. 2 is a side cross-sectional view of the first and second protective layers of fig. 1.
Detailed Description
For the purposes of promoting an understanding of the principles and advantages of the disclosure, reference will now be made in detail to the following specific examples.
It is noted that unless otherwise defined, technical or scientific terms used in one or more embodiments of the present disclosure should be taken in a general sense as understood by one of ordinary skill in the art to which the present disclosure pertains. The use of the terms "first," "second," and the like in one or more embodiments of the present description does not denote any order, quantity, or importance, but rather the terms "first," "second," and the like are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.
The embodiment of the invention provides a flame-retardant communication cable. As shown in fig. 1 to 2, a flame retardant communication cable includes: three high-frequency four-wire sets 1, four low-frequency four-wire sets 2, a first insulating layer 3, three signal twisted pairs 4, a second insulating layer 5, a filler, a first water-blocking tape 6, an inner sheath 7 and a sheath material 8, wherein,
the high-frequency four-wire set 1 and the low-frequency four-wire set 2 are formed by actively paying off left-hand pre-twisting four insulated wire cores of red, green, white and blue, the surfaces of the four insulated wire cores are in spiral winding stable structures of color yarns with different colors, cable cores are stranded concentrically, the pitches of adjacent four-wire sets of the same layer of the cable cores are different, the twisting directions of the inner layer and the outer layer are opposite, and the outermost layer is right;
the first insulating layer 3 is wrapped outside the high-frequency four-wire set 1 and the low-frequency four-wire set 2, and the first insulating layer 3 is formed by extruding polyolefin skin-bubble-skin physical foaming insulation;
the second insulating layer 5 wraps the signal pair twisting group 4, the second insulating layer 5 adopts an extruded polyolefin solid insulating structure, the insulating foaming degree is 60%, and the insulating concentricity is more than or equal to 98%;
the first water-blocking tape 6 wraps three groups of the first insulating layers 3 and the second insulating layers 5, the thickness of the first water-blocking tape 6 is 0.25mm, and a polyester tape with the thickness of 0.05mm can be arranged on the inner layer of the first water-blocking tape 6;
the filler fills the gap formed between the first water-blocking tape 6 and the first insulating layer 3 and the second insulating layer 5, and is ointment with the fullness degree of not less than 90%;
the inner sheath 7 is arranged on the periphery of the first water-blocking tape 6, and the inner sheath 7 adopts a B1-level special high-flame-retardant halogen-free low-smoke ceramic oxygen-blocking layer material so as to prevent flame and heat from being transferred into the cable core, thereby greatly reducing the combustion of the cable;
the sheath material 8 is arranged on the periphery of the inner sheath 7, and the sheath material 8 is a B1-level halogen-free flame-retardant sheath material 8.
Alternatively, the conductors in the four-wire set are made of high conductivity oxygen-free copper.
According to the above, the special B1-level halogen-free low-smoke flame-retardant sheath material 8 is adopted as the sheath material 8, so that the smoke quantity and the combustion heat of the cable are reduced, the flame retardant level of the cable is improved, meanwhile, the cable has the characteristics of no halogen, low smoke, flame retardance, low toxicity and the like, and meanwhile, when the cable is combusted, the total heat emission amount is low, the combustion carbonization height is small, and the safety of the railway long-distance symmetrical communication cable in a sealed environment is greatly improved. The high-frequency four-wire set 1 adopts an extruded polyolefin skin-bubble-skin physical foaming insulation shielding structure, so that the communication quality in the transmission process is improved.
In some embodiments, the first water blocking tape 6 is wrapped with a heat insulating layer 9, and the heat insulating layer 9 is a black polyethylene heat insulating layer 9 with a thickness of 1.0 mm.
In some embodiments, the insulating layer 9 is externally wrapped with a second water-blocking tape 10, optionally the second water-blocking tape 10 having a thickness of 0.25mm.
In some embodiments, the second water-blocking tape 10 is welded on the outside to form an aluminum sheath 11. Optionally, the thickness of the aluminum sheath 11 is 1.8mm.
In some embodiments, the aluminum sheath 11 is coated with a corrosion protection layer 12 on the outer surface. The corrosion protection layer 12 is a layer of hot melt adhesive with the thickness of 0.3 mm.
In some embodiments, a steel tape armour 13 is provided between the inner sheath 7 and the sheath material 8. The steel tape armor 13 is a double-layer high magnetic conductive steel tape armor 13, and under the combined action of the steel tape armor 13 and the aluminum sheath 11 with the thickness of 1.8mm, the shielding coefficient of the cable is ensured to be smaller than 0.01.
In some embodiments, the exterior of the jacket material 8 is provided with an aluminum alloy protective jacket.
Optionally, the protective sleeve includes a first protective layer 14 and a second protective layer 15, a protrusion 16 is disposed on the first protective layer 14, a groove is disposed on the second protective layer 15, the first protective layer 14 and the second protective layer 15 are detachably connected together through the matching of the protrusion 16 and the groove, a notch 17 is formed at one end of the first protective layer 14 and one end of the second protective layer 15, a convex column 18 is formed at the other end, two protective sleeves are detachably connected through the notch 17 and the convex column 18, and an air hole 19 is disposed on the second protective layer 15.
When snowing, thick snow and ice cover can influence the normal use of cable on the cable, usually remove snow and deicing through the manual work at present, and the manpower that needs is more, and efficiency is not very high simultaneously. This cable snow can fall on first protective layer 14 and second protective layer 15, then lets in the hot gas flow in to gas pocket 19, and the hot gas flow is discharged through other gas pockets 19, and the surface of first protective layer 14 and second protective layer 15 can be transmitted to the heat simultaneously, melts snow and ice on the surface, has reduced the requirement of manpower, can promote the efficiency of removing snow deicing simultaneously.
In some embodiments, a baffle 20 is disposed above the air hole 19. So the hot air current can blow to the snow from the top of snow, and the heat of snow bottom outgoing in the cooperation melts the operation simultaneously in two directions, has further promoted and has melted efficiency.
The present disclosure is intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Any omissions, modifications, equivalents, improvements, and the like, which are within the spirit and principles of the one or more embodiments of the disclosure, are therefore intended to be included within the scope of the disclosure.
Claims (6)
1. A flame retardant communication cable, comprising: three high-frequency four-wire sets, four low-frequency four-wire sets, a first insulating layer, three signal twisted pairs, a second insulating layer, a filler, a first water-blocking belt, an inner sheath and a sheath material, wherein,
the high-frequency four-wire set and the low-frequency four-wire set are formed by actively paying off left-hand pre-twisting four insulated wire cores of red, green, white and blue;
the first insulating layer is wrapped outside the high-frequency four-wire set and the low-frequency four-wire set, and is formed by physically foaming and insulating extruded polyolefin skin-bubble-skin;
the second insulating layer wraps the signal pair twisting group, and the second insulating layer adopts an extruded polyolefin solid insulating structure;
the first water blocking tape wraps three groups of the first insulating layer and the second insulating layer;
the filler fills a gap formed between the first water blocking tape and the first and second insulating layers;
the inner sheath is arranged at the periphery of the first water blocking belt;
the sheath material is arranged on the periphery of the inner sheath, and the sheath material is B1-level halogen-free flame-retardant sheath material;
an aluminum alloy protective sleeve is arranged outside the sheath material;
the protective sleeves comprise a first protective layer and a second protective layer, wherein the first protective layer is provided with a bulge, the second protective layer is provided with a groove, the first protective layer and the second protective layer are detachably connected together through the matching of the bulge and the groove, one ends of the first protective layer and the second protective layer are provided with a notch, the other ends of the first protective layer and the second protective layer are provided with convex columns, the two protective sleeves are detachably connected through the notch and the convex columns, and the second protective layer is provided with air holes;
a guide plate is arranged above the air hole;
the two sides of the guide plate are provided with arc-shaped sections which are bent downwards, and hot air flow blown out of the air holes reaches the guide plate and then is blown to the upper part of the second protective layer through the arc-shaped sections.
2. A fire retardant communication cable according to claim 1, wherein the first water blocking tape is externally wrapped with a heat insulating layer.
3. A fire resistant communications cable according to claim 2 wherein said insulating layer is surrounded by a second water blocking tape.
4. A fire retardant communication cable according to claim 3, wherein the second water blocking tape is welded on the outside longitudinally to form an aluminium sheath.
5. A flame retardant communication cable according to claim 4 wherein said aluminum sheath outer surface is coated with a corrosion resistant layer.
6. A fire resistant communications cable according to claim 1 wherein a steel tape armour is provided between the inner sheath and the sheath material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110175720.1A CN113035429B (en) | 2021-02-06 | 2021-02-06 | Flame-retardant communication cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110175720.1A CN113035429B (en) | 2021-02-06 | 2021-02-06 | Flame-retardant communication cable |
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| Publication Number | Publication Date |
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| CN113035429A CN113035429A (en) | 2021-06-25 |
| CN113035429B true CN113035429B (en) | 2023-04-21 |
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| CN202110175720.1A Active CN113035429B (en) | 2021-02-06 | 2021-02-06 | Flame-retardant communication cable |
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Citations (2)
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| CN203056516U (en) * | 2012-12-09 | 2013-07-10 | 国家电网公司 | Transmission line deicing device |
| CN209298847U (en) * | 2018-12-21 | 2019-08-23 | 贵州电网有限责任公司凯里供电局 | A kind of power distribution network packaged type deicing device for encouraging ice-melt mode by force |
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| CN101504877B (en) * | 2008-02-04 | 2012-10-10 | 尹学军 | Ice coagulation preventing cable and auxiliary equipment |
| CN103401201B (en) * | 2013-08-08 | 2016-01-20 | 陈一文 | A kind of de-icing method of high-voltage power transmission cable |
| CN204991274U (en) * | 2015-08-06 | 2016-01-20 | 济南瑞通铁路电务有限责任公司 | Signal cable is synthesized to special railway of interlocking |
| CN206163190U (en) * | 2016-10-28 | 2017-05-10 | 济南瑞通铁路电务有限责任公司 | Long -distance symmetrical railway communication cable |
| CN208521681U (en) * | 2018-07-17 | 2019-02-19 | 安徽华菱新材料科技有限公司 | A kind of railway long distance symmetrical communication cable |
| CN208889369U (en) * | 2018-09-03 | 2019-05-21 | 江阴神辉电工材料有限公司 | A kind of highway high efficient antifreeze snow melt cable |
| CN109401043A (en) * | 2018-12-03 | 2019-03-01 | 宝胜科技创新股份有限公司 | B1 grades of flame retardant cables low smoke, zero halogen ethane-acetic acid ethyenyl ester protective cover material and preparation methods |
| IT201900005642A1 (en) * | 2019-04-12 | 2020-10-12 | Tratos Cavi S P A | AERIAL POWER LINE CABLE MADE TO PREVENT THE FORMATION OF SNOW SLEEVES ON IT |
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2021
- 2021-02-06 CN CN202110175720.1A patent/CN113035429B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203056516U (en) * | 2012-12-09 | 2013-07-10 | 国家电网公司 | Transmission line deicing device |
| CN209298847U (en) * | 2018-12-21 | 2019-08-23 | 贵州电网有限责任公司凯里供电局 | A kind of power distribution network packaged type deicing device for encouraging ice-melt mode by force |
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| CN113035429A (en) | 2021-06-25 |
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