CN109036682B - Heat-insulating fire-resistant low-smoke halogen-free flame-retardant medium-voltage cable with air channel - Google Patents
Heat-insulating fire-resistant low-smoke halogen-free flame-retardant medium-voltage cable with air channel Download PDFInfo
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- CN109036682B CN109036682B CN201810857031.7A CN201810857031A CN109036682B CN 109036682 B CN109036682 B CN 109036682B CN 201810857031 A CN201810857031 A CN 201810857031A CN 109036682 B CN109036682 B CN 109036682B
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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
- H01B7/292—Protection against damage caused by extremes of temperature or by flame using material resistant to heat
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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
-
- 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
- H01B9/00—Power cables
- H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
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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
- Y02A30/14—Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables
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- Insulated Conductors (AREA)
Abstract
The invention discloses a heat-insulating fire-resistant low-smoke halogen-free flame-retardant medium-voltage cable with an air channel, which comprises a conductor, a conductor shielding layer, an insulating shielding layer, a metal shielding layer, a tape layer, an oxygen-insulating layer, an insulating tape layer, a fire-resistant layer, a protective tape layer and an outer protective layer which are sequentially nested from inside to outside, wherein a plurality of insulating cavities are extruded on the outer circular surface of the oxygen-insulating layer, the air channel is formed in the insulating cavities along the length direction of the cable, the oxygen-insulating layer is extruded by adopting a halogen-free low-smoke flame-retardant oxygen-insulating layer filler, and the insulating tape layer is formed by overlapping and wrapping a low-smoke halogen-free flame-retardant tape. The medium-voltage cable in this application adopts air channel heat dissipation, separates oxygen layer cooling, flame retardant coating to separate fire, thermal-insulated, compound cooling heat-proof fire-resistant design such as cooling down, lets the cable can the steady operation more than 90min in the conflagration, has effectively ensured personnel to flee, conflagration save oneself and fire alarm rescue.
Description
Technical Field
The invention relates to the technical field of medium-voltage power cables, in particular to a heat-insulating fire-resistant low-smoke halogen-free flame-retardant medium-voltage cable with an air channel for high-rise buildings and densely populated large public places.
Background
Fire resistant cables themselves belong to fire fighting equipment, and the grade of such products is determined by the nature and scale of the building. The main basis for selecting the fire-resistant cable in civil buildings is to select the magnesium oxide cable and the organic insulation fire-resistant cable according to the design specification of the civil buildings. According to the temperature measurement finding of fire departments, most of the flame center temperature is between 700 ℃ and 850 ℃ in civil building fire, the organic insulating fireproof cable can normally run for 90 minutes at the temperature, and precious time is striven for personnel escape, fire rescue and self-rescue in the building. Because of the structure and the use characteristics, the medium-voltage power cable cannot be insulated by magnesium oxide and mica tape minerals like low-voltage products, only organic insulation can be adopted, the fire resistance of the medium-voltage cable is required to be made outside an insulation wire core, the medium-voltage fire-resistant flame-retardant cable in domestic market is started by using ceramic silicon rubber as a fire-resistant layer, but the ceramic silicon rubber is required to be extruded and produced by an extruder, then vulcanized at high temperature, certain requirements are met on equipment, the insulation wire core is heated and expanded in the vulcanization process, tight combination is generated at the insulation shielding position and the metal shielding position, obvious copper strip tightening marks are generated on the insulation shielding surface after the wire core is cooled, the insulation wire core is seriously deformed, and the long-term operation stability and the service life of the cable are affected to a certain extent.
Disclosure of Invention
The invention aims to solve the technical problems in the prior art, and provides a medium-voltage fire-resistant power cable suitable for a fire-fighting system of a civil building with intensive personnel, such as a high-rise building, a subway, a market and the like. The cable adopts the composite cooling, heat insulation and fire resistance designs of air channel heat dissipation, oxygen isolation layer cooling, fire resistance layer fire isolation, heat insulation, cooling and the like, so that the cable can stably run for more than 90 minutes in a fire disaster, and personnel escape, fire disaster self-rescue and fire alarm rescue are effectively ensured.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the utility model provides a thermal-insulated fire-resistant low smoke and zero halogen fire-retardant middling pressure cable with air channel, includes from interior conductor, conductor shielding layer, insulating shielding layer, metal shielding layer, band layer, separates oxygen layer, keeps apart band layer, flame retardant coating, protection band layer and outer sheath that the nestification set gradually to outside, the outer disc extrusion that separates the oxygen layer has many isolation chamber, isolation chamber forms air channel along cable length direction, separates the oxygen layer and adopts the fire-retardant oxygen layer filler extrusion of no halogen, separates the band layer and adopts the overlapping of no halogen fire-retardant area to wrap up and form.
Further, the isolation cavity is gear-type, and is formed by extruding a gear-type die outside the oxygen isolation layer in an external surface pressing mode.
Further, the conductor is formed by drawing wires of oxygen-free copper rods or aluminum alloy rods, twisting and compacting.
Further, the conductor shielding layer, the insulating layer and the insulating shielding layer extrude the insulating wire core in a three-layer coextrusion mode.
Further, the conductor shielding layer is formed by extruding and crosslinking a crosslinked semiconductive inner shielding material.
Further, the insulating layer is formed by extrusion and crosslinking of a crosslinked polyethylene insulating material.
Further, the insulating shielding layer is formed by extrusion and crosslinking of a semiconductive outer shielding material.
Further, the metal shielding layer is formed by overlapping and winding an annealed soft copper belt or sparse winding an annealed soft copper wire.
Further, the wrapping tape layer and the protection wrapping tape layer are formed by overlapping and wrapping halogen-free flame retardant tapes, and the outer protective layer is formed by extruding halogen-free flame retardant sheath materials.
Further, the refractory layer is formed by extruding ceramic polyolefin.
The invention has the following beneficial effects: the oxygen isolation layer adopts a special extrusion die, regularly dispersed isolation cavities (the cross section is gear-shaped) are formed on the surface of the oxygen isolation layer, an air storage space is formed after wrapping the wrapping tape, and an air channel layer along the length direction of the cable is formed. After the cable is on fire, heat is diffused from the ignition point to the cable core direction and the length direction, the heat transfer speed is reduced due to the existence of the air layer in the cable core direction, and the total heat transferred to the insulated wire core in unit time is reduced due to the fact that the heat is diffused to a place farther away from the ignition point along the air channel in the length direction.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the structure of a heat-insulating fire-resistant low smoke zero halogen flame retardant medium voltage cable with air channels of the present invention;
FIG. 2 is a schematic view of the structure of the oxygen barrier layer of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making clear and defining the scope of the present invention.
Referring to fig. 1 and 2, the invention provides a heat-insulating fire-resistant low-smoke halogen-free flame-retardant medium voltage cable with an air channel, which comprises a conductor 1, a conductor shielding layer 2, an insulating layer 3, an insulating shielding layer 4, a metal shielding layer 5, a wrapping belt layer 6, an oxygen isolation layer 7, an insulating wrapping belt layer 8, a fire-resistant layer 9, a protective wrapping belt layer 10 and an outer protective layer 11 which are sequentially nested from inside to outside, wherein a plurality of isolation cavities 71 are extruded on the outer circumferential surface of the oxygen isolation layer 7, the preferred isolation cavities 71 are gear-type, the isolation cavities 71 are formed by extruding a gear-type die on the outer surface of the oxygen isolation layer 7, the air channel is formed by the isolation cavities 71 along the length direction of the cable, the oxygen isolation layer 7 adopts a low-smoke halogen-free oxygen isolation layer filling material, and the isolation cavities 71 are extruded simultaneously by adopting an extrusion die; the isolation belt layer 8 is formed by overlapping and wrapping the low-smoke halogen-free flame retardant belt, the production of the isolation belt layer is not required to be carried out in a separate process, the fire retardant layer 9 is produced while wrapping, and the production working hours are not occupied. The conductor 1 is formed by drawing wires of oxygen-free copper rods or aluminum alloy rods, twisting and compacting. The conductor shielding layer 2, the insulating layer 3 and the insulating shielding layer 4 are extruded into a whole insulating wire core in a three-layer coextrusion mode. The conductor shielding layer 2 is formed by extruding and crosslinking a crosslinked semiconductive inner shielding material. The insulating layer 3 is formed by extrusion and crosslinking of a crosslinked polyethylene insulating material. The insulating shielding layer 4 is formed by extrusion and crosslinking of a semiconductive outer shielding material. The metal shielding layer 5 is formed by overlapping and wrapping a common high-purity annealed soft copper belt or sparse winding a high-purity annealed soft copper wire. The wrapping layer 6 is formed by overlapping and wrapping the low-smoke halogen-free flame-retardant tape, production does not need a separate process, production time is not occupied when the metal shielding layer is produced, the protection wrapping layer 10 is formed by overlapping and wrapping the low-smoke halogen-free flame-retardant tape, production does not need a separate process, production time is not occupied when the outer protective layer is produced, and the outer protective layer 11 is formed by extruding the low-smoke halogen-free flame-retardant sheath material. The refractory layer is made of ceramic polyolefin which can be encrusted and cooled and insulated when meeting fire or high temperature and is extruded by a common extruder. The low-smoke halogen-free flame-retardant material is a common material of cables in the prior art.
The cable manufacturing method in the application comprises the following steps:
the method comprises the steps of adopting a round tightly-pressed stranded copper core or aluminum alloy core as a conductor 1, adopting a three-layer co-extruded conductor shielding layer 2+XLPE insulating layer 3+insulating shielding layer 4 as an insulating wire core, adopting a soft copper strip or soft copper wire as a metal shielding layer 5, wrapping a low smoke halogen-free flame retardant tape to form a wrapping tape layer 6 after metal shielding, avoiding that the insulating wire core and the copper strip are scalded when extruding an oxygen isolation layer 7 to absorb heat quickly so that an extruded material is severely cooled to generate a disjoint and the like, extruding a gear-type oxygen isolation layer 7 by adopting a special design die, wrapping the low smoke halogen-free flame retardant tape on the surface of the oxygen isolation layer 7 to form an isolation wrapping tape layer 8, and forming a closed air channel by an isolation cavity 71, wherein the protection oxygen isolation layer cannot collapse when extruding the flame retardant layer 9, and adopting a ceramic polyolefin extruded flame retardant layer 9 outside the flame retardant layer 9, wherein the low smoke halogen-free flame retardant tape is wrapped outside the flame retardant layer 9 to be used as a protection wrapping tape layer 10, on the one hand, the low smoke halogen-free flame retardant tape which is high in high temperature resistant above 1300 ℃ is a good fire-resistant, and flame resistant material is used as a first fire-proof line, and the flame is directly impacted on the ceramic polyolefin; on the other hand, the ceramic polyolefin can expand during ceramic, and the low-smoke halogen-free flame-retardant belt is adopted, so that the shaping of the ceramic polyolefin can be assisted, and fragile areas such as cracks and the like caused by uneven temperature of the area can be avoided; the outer extrusion of the protective wrapping tape layer 10 is used as an outer sheath 11.
The invention has the following beneficial effects:
(1) The invention relates to a heat-insulating fire-resistant low-smoke halogen-free flame-retardant medium-voltage cable with an air channel, wherein an oxygen-insulating layer adopts a special extrusion die, regularly dispersed isolation cavities (the cross section is gear-shaped) are formed on the surface of the oxygen-insulating layer, an air storage space is formed after wrapping a tape, and an air channel layer along the length direction of the cable is formed. After the cable is on fire, heat is diffused from the ignition point to the cable core direction and the length direction, the heat transfer speed is reduced due to the existence of the air layer in the cable core direction, and the total heat transferred to the insulated wire core in unit time is reduced due to the fact that the heat is diffused to a place farther away from the ignition point along the air channel in the length direction.
(2) According to the heat-insulating fire-resistant low-smoke halogen-free flame-retardant medium-voltage cable fire-resistant layer with the air channel, a thermoplastic ceramic polyolefin material is adopted to replace ceramic silicon rubber, and a common extruder is adopted to extrude, so that the insulated wire core is not damaged; the production can be carried out by a common plastic extruding machine without vulcanizing, and the production cost is reduced.
(3) The heat-insulating fire-resistant low-smoke halogen-free flame-retardant medium-voltage cable with the air channel adopts a multi-layer cooling heat-insulating fire-resistant design, so that the cable can stably run for more than 90 minutes in a fire disaster, and personnel escape, fire disaster self-rescue and fire alarm rescue are effectively ensured.
(4) According to the heat-insulating fire-resistant low-smoke halogen-free flame-retardant medium-voltage cable with the air channel, the oxygen-insulating layer, the fire-resistant layer and the outer protective layer are made of low-smoke halogen-free flame-retardant materials, toxic smoke which damages the respiratory system of people can not be generated in a fire disaster, and the safety of the people is effectively ensured.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, the patentees may make various modifications or alterations within the scope of the appended claims, and are intended to be within the scope of the invention as described in the claims.
Claims (9)
1. The utility model provides a thermal-insulated fire-resistant low smoke and zero halogen fire-retardant medium voltage cable with air channel which characterized in that: including conductor, conductor shielding layer, insulating shielding layer, metal shielding layer, band layer, oxygen barrier layer, isolation band layer, flame retardant coating, protection band layer and outer sheath that from interior to exterior nested setting in proper order, the external disc extrusion on oxygen barrier layer has many isolation chamber, the isolation chamber forms air channel along cable length direction, and the oxygen barrier adopts the fire-retardant oxygen barrier filler extrusion of halogen-free, and isolation band layer adopts the overlapping of halogen-free fire-retardant area to wrap up and form, the isolation chamber is gear type, just the isolation chamber is formed by gear type mould at the outer gauge pressure extrusion of oxygen barrier.
2. The insulated fire-resistant low smoke zero halogen flame retardant medium voltage cable with air channels of claim 1, wherein: the conductor is formed by drawing wires of oxygen-free copper rods or aluminum alloy rods, twisting and compacting.
3. The insulated fire-resistant low smoke zero halogen flame retardant medium voltage cable with air channels of claim 1, wherein: the conductor shielding layer, the insulating layer and the insulating shielding layer extrude the insulating wire core in a three-layer coextrusion mode.
4. A thermally insulated fire resistant low smoke zero halogen flame retardant medium voltage cable with air passages as defined in claim 3 wherein: the conductor shielding layer is formed by extruding and crosslinking a crosslinked semiconductive inner shielding material.
5. A thermally insulated fire resistant low smoke zero halogen flame retardant medium voltage cable with air passages as defined in claim 3 wherein: the insulating layer is formed by extrusion and crosslinking of a crosslinked polyethylene insulating material.
6. A thermally insulated fire resistant low smoke zero halogen flame retardant medium voltage cable with air passages as defined in claim 3 wherein: the insulating shielding layer is formed by extrusion and crosslinking of a semiconductive outer shielding material.
7. The insulated fire-resistant low smoke zero halogen flame retardant medium voltage cable with air channels of claim 1, wherein: the metal shielding layer is formed by overlapping and winding an annealed soft copper belt or sparse winding an annealed soft copper wire.
8. The insulated fire-resistant low smoke zero halogen flame retardant medium voltage cable with air channels of claim 1, wherein: the wrapping layer and the protection wrapping layer are formed by overlapping and wrapping halogen-free flame retardant belts, and the outer protective layer is formed by extruding halogen-free flame retardant sheath materials.
9. The insulated fire-resistant low smoke zero halogen flame retardant medium voltage cable with air channels of claim 1, wherein: the refractory layer is formed by extruding ceramic polyolefin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810857031.7A CN109036682B (en) | 2018-07-31 | 2018-07-31 | Heat-insulating fire-resistant low-smoke halogen-free flame-retardant medium-voltage cable with air channel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810857031.7A CN109036682B (en) | 2018-07-31 | 2018-07-31 | Heat-insulating fire-resistant low-smoke halogen-free flame-retardant medium-voltage cable with air channel |
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| Publication Number | Publication Date |
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| CN109036682A CN109036682A (en) | 2018-12-18 |
| CN109036682B true CN109036682B (en) | 2023-08-01 |
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| CN112117034A (en) * | 2020-09-21 | 2020-12-22 | 昆明昆宝电线电缆制造有限公司 | High anti-interference type computer cable |
| CN113488270A (en) * | 2021-06-30 | 2021-10-08 | 重庆泰山电缆有限公司 | High-current-carrying medium-voltage fire-resistant cable |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH0689614A (en) * | 1991-11-12 | 1994-03-29 | Nitsukan Kogyo Kk | Heat radiation insulator tube and covered wire |
| US7015398B2 (en) * | 2003-03-10 | 2006-03-21 | Gavriel Vexler | Communications cable |
| EP1956404B1 (en) * | 2007-02-08 | 2012-05-16 | Nexans | Slotted core with improved fire properties for a cable use |
| CN102820089A (en) * | 2011-06-10 | 2012-12-12 | 江苏上上电缆集团有限公司 | Medium voltage fire resisting cable |
| CN205881558U (en) * | 2016-07-28 | 2017-01-11 | 江苏长峰电缆有限公司 | Shock -resistant resistant spraying does not have steamed low fire -retardant middling pressure fire resisting cable of cigarette |
| CN205862822U (en) * | 2016-08-03 | 2017-01-04 | 上海矿用电缆厂有限公司 | Mine cable with air duct |
| CN208385063U (en) * | 2018-07-31 | 2019-01-15 | 特变电工山东鲁能泰山电缆有限公司 | A kind of insulating refractory low-smoke non-halogen flame-retardant midium voltage cable with air duct |
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