CN110570981A - Flame-retardant B1-grade cable - Google Patents
Flame-retardant B1-grade cable Download PDFInfo
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- CN110570981A CN110570981A CN201910900275.3A CN201910900275A CN110570981A CN 110570981 A CN110570981 A CN 110570981A CN 201910900275 A CN201910900275 A CN 201910900275A CN 110570981 A CN110570981 A CN 110570981A
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- cable core
- cable
- conductor
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- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 title claims abstract description 53
- 239000003063 flame retardant Substances 0.000 title claims abstract description 52
- 239000000919 ceramic Substances 0.000 claims abstract description 117
- 239000000835 fiber Substances 0.000 claims abstract description 115
- 239000004020 conductor Substances 0.000 claims abstract description 74
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 34
- 239000001301 oxygen Substances 0.000 claims abstract description 34
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 33
- 229920000742 Cotton Polymers 0.000 claims abstract description 29
- 238000002955 isolation Methods 0.000 claims abstract description 14
- 238000009413 insulation Methods 0.000 claims abstract 2
- 229920000098 polyolefin Polymers 0.000 claims description 37
- 239000000779 smoke Substances 0.000 claims description 31
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 20
- 239000002905 metal composite material Substances 0.000 claims description 17
- 238000001816 cooling Methods 0.000 claims description 15
- 239000000945 filler Substances 0.000 claims description 13
- 229910052802 copper Inorganic materials 0.000 claims description 11
- 239000010949 copper Substances 0.000 claims description 11
- 239000002131 composite material Substances 0.000 claims description 8
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 5
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims description 5
- 239000000347 magnesium hydroxide Substances 0.000 claims description 5
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims description 5
- 238000001125 extrusion Methods 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 5
- 230000002265 prevention Effects 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 31
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 12
- 239000002657 fibrous material Substances 0.000 description 8
- 239000002994 raw material Substances 0.000 description 7
- 230000004888 barrier function Effects 0.000 description 6
- 239000000843 powder Substances 0.000 description 6
- 239000000377 silicon dioxide Substances 0.000 description 6
- 239000012796 inorganic flame retardant Substances 0.000 description 5
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 4
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 238000007664 blowing Methods 0.000 description 3
- 239000004927 clay Substances 0.000 description 3
- 238000010891 electric arc Methods 0.000 description 3
- 235000012239 silicon dioxide Nutrition 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 229920002994 synthetic fiber Polymers 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000009970 fire resistant effect Effects 0.000 description 2
- 239000003365 glass fiber Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000012958 reprocessing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
-
- 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
- H01B7/42—Insulated conductors or cables characterised by their form with arrangements for heat dissipation or conduction
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B9/00—Power cables
Abstract
The invention discloses a flame-retardant B1-grade cable, which is provided with a cable core mainly composed of a plurality of insulated conductors, wherein an inner ceramic fiber belt layer, an oxygen isolation layer, an outer ceramic fiber belt layer and a sheath layer are sequentially coated on the cable core from inside to outside, and a ceramic fiber cotton filling layer is filled in a combined gap of the cable core coated by the inner ceramic fiber belt layer. According to the invention, through the structural arrangement, the insulating conductor of the cable core is protected in a multi-layer manner, so that the flame is prevented from burning towards the inside of the cable core, and meanwhile, the external heat can be prevented from being conducted onto the insulating conductor of the cable core to the greatest extent, and the cable core has the characteristics of good fire prevention and insulation performance and excellent flame retardant effect.
Description
Technical Field
The invention relates to a power cable, in particular to a power cable capable of passing a flame-retardant B1-grade test.
Background
The cable is classified into a general cable, a flame retardant cable, and a fire resistant cable according to its own combustion characteristics. The flame-retardant cable can be divided into A, B, C, D four flame-retardant grades according to the classification of the combustion performance, the common flame-retardant cable is manufactured and molded according to the technical standard of GB/T19666-2005 flame-retardant and fire-resistant cable general rules, and the flame-retardant cable is widely applied to national economic construction.
However, in the burning process of fire, the flame temperature usually reaches about 750 ℃, even about 950 ℃, the temperature resistant grade of the glass fiber filling layer and the glass fiber tape layer of the flame retardant cable cannot adapt to the burning temperature, the flame retardant cable is very easy to burn, and the burned residues are very fragile, can easily fall off after being slightly touched or vibrated, cannot effectively prevent the flame or temperature from burning and transmitting to the inside, cannot protect the insulating layer with poor flame retardant property of the inner layer, and thus cause the burning of the insulating layer material (because the insulating material is mostly organic matter which is easy to burn), finally causes the continuous burning of the whole cable, releases a large amount of heat and smoke, and cannot guarantee the fire safety.
Along with the rapid and steady development of national subway key projects, particularly, people in subway stations are dense and congested, once a fire sign appears, the loss of national property is caused, and more seriously, the life safety of a plurality of people is threatened. Therefore, the state publishes the technical standard of mandatory national standard GB 31247-2014 'Classification of burning performance of electric cables and optical cables' in 12-5 th month in 2014, and in the technical standard, by quantizing the technical indexes of the Classification of the burning performance of the electric cables and the optical cables, the fire prevention safety is more scientific and reasonable, and the possible fire hazard is reduced to the lowest.
Obviously, the conventional flame-retardant cable is difficult to meet the increasingly stringent and more scientific and reasonable technical standard regulations, cannot meet the development requirements of the market and the technology, and needs to be improved.
Disclosure of Invention
The technical purpose of the invention is as follows: aiming at the defects of the prior art, the flame-retardant B1-grade cable with good fireproof and fire-proof performance and excellent flame-retardant effect is provided.
The technical purpose of the invention is realized by the following technical scheme: a flame-retardant B1-grade cable is provided with a cable core mainly composed of a plurality of insulated conductors, wherein an inner ceramic fiber belt layer, an oxygen isolation layer, an outer ceramic fiber belt layer and a sheath layer are sequentially coated on the cable core from inside to outside, and a ceramic fiber cotton filling layer is filled in a combined gap of the cable core coated by the inner ceramic fiber belt layer.
Preferably, a mirror-surface metal composite tape layer is coated between the inner ceramic fiber tape layer and the oxygen barrier layer. Furthermore, the mirror surface metal composite belt layer is of at least one layer of lapping structure of a mirror surface aluminum-plastic composite belt.
Preferably, the inner ceramic fiber tape layer is at least one layer of wrapping structure of ceramic fiber tapes.
As one preferable scheme, a cooling layer is coated between the oxygen-insulating layer and the outer ceramic fiber tape layer, and the cooling layer is a molding structure in which a hollow cavity is filled with aluminum hydroxide or magnesium hydroxide filler. Furthermore, the cooling layer is composed of a plurality of hollow pipes which are circumferentially arranged and a filler which is filled in each hollow pipe.
As one preferable scheme, the oxygen isolation layer is an extruded layer structure of low-smoke halogen-free polyolefin.
Preferably, the outer ceramic fiber belt layer is at least one layer of wrapping structure of the ceramic fiber belt.
As one preferable scheme, the sheath layer is an extruded layer structure of low-smoke halogen-free flame-retardant polyolefin.
As one preferred scheme, a plurality of insulated conductors of the cable core are twisted together, and a ceramic fiber cotton filling layer is filled in a twisting gap. Furthermore, each insulated conductor of the cable core mainly comprises a conductor and an insulating layer coated on the conductor, wherein the conductor is a 1 st copper conductor, a 2 nd copper conductor or a 5 th soft copper conductor in the standard GB/T3956, and the insulating layer is an extruded layer structure of irradiation type cross-linked polyolefin. Still further, the conductor of the insulated conductor is in a single-stranded copper wire structure or a multi-stranded copper wire twisted structure.
The beneficial technical effects of the invention are as follows:
1. The ceramic fiber material adopted by the invention is an aluminum silicate refractory fiber, which is prepared by melting hard clay clinker or industrial alumina powder and silica powder synthetic material serving as raw materials in an electric arc furnace or a resistance furnace and forming fibers by blowing compressed air (or a wire throwing method), wherein the chemical components mainly comprise aluminum oxide (30-55%) and silicon dioxide, and the ceramic fiber material is reprocessed and formed, has the characteristics of low thermal capacity, low thermal conductivity, excellent thermal stability and high temperature resistance of over 1000 ℃, and cannot be combusted; the material is filled in the combined gap of the cable core, the inner ceramic fiber band layer, the oxygen barrier layer, the outer ceramic fiber band layer and the like are reasonably arranged outside the cable core, and the insulating conductor of the cable core forms multi-layer protection through the structural arrangement so as to prevent flame from burning towards the inside of the cable core and prevent external heat from being conducted towards the insulating conductor of the cable core to the maximum extent;
2. The mirror surface metal composite belt layer coated between the internal ceramic fiber belt layer and the oxygen isolation layer can reflect most of heat, so that the temperature influence of external heat on an internal structural member is reduced, and the conduction of external heat to an insulated conductor of a cable core is further effectively prevented, which is particularly obvious in the structure that the mirror surface metal composite belt layer adopts the mirror surface aluminum-plastic composite belt wrapping, and the reflection effect of the surface of the mirror surface aluminum-plastic composite belt as a heat reflection layer is excellent;
3. the cooling layer coated between the oxygen-isolating layer and the outer ceramic fiber band layer can decompose aluminum hydroxide or magnesium hydroxide as filler into aluminum oxide/magnesium oxide and water (H) in the cable combustion process2O), the flame temperature is effectively reduced through the existence of moisture, the combustion of the flame is prevented, and the fireproof and flame-retardant effects of the flame are further effectively improved;
4. The hollow pipe arrangement structure of the cooling layer can realize compact and compact arrangement, and has high strength and good integrity.
Drawings
Fig. 1 is a schematic structural diagram of the present invention, and it can be seen that a cable core mainly comprises four insulated conductors, each of which mainly comprises a conductor and an insulating layer coated on the conductor; an inner ceramic fiber belt layer, a mirror surface metal composite belt layer, an oxygen barrier layer, an outer ceramic fiber belt layer and a sheath layer are sequentially coated on the cable core from inside to outside; a ceramic fiber cotton filling layer is filled in the combined gap of the cable core coated by the inner ceramic fiber belt layer.
FIG. 2 is another schematic structural diagram of the present invention, and it can be seen that a cable core is mainly composed of four insulated conductors, each of which is mainly composed of a conductor and an insulating layer coated on the conductor; an inner ceramic fiber belt layer, a mirror surface metal composite belt layer, an oxygen barrier layer, a cooling layer, an outer ceramic fiber belt layer and a sheath layer are sequentially coated on the cable core from inside to outside; a ceramic fiber cotton filling layer is filled in a combined gap of the cable core coated by the inner ceramic fiber belt layer; the cooling layer is composed of a plurality of pipe-shaped structures with fillers which are circumferentially arranged.
Fig. 3 is an enlarged schematic view of the cooling layer in fig. 2, and it can be seen that the units constituting the cooling layer are hollow tubes and fillers filled in the hollow tubes.
The reference numbers in the figures mean: 1-a conductor; 2-an insulating layer; 3-a ceramic fiber cotton filling layer; 4-internal ceramic fiber belt layer; 5-mirror surface metal composite belt layer; 6-oxygen barrier layer; 7-cooling layer; 71-a hollow tube; 72-a filler; 8-outer ceramic fiber tape layer; 9-sheath layer.
Detailed Description
The invention relates to a power cable, in particular to a power cable capable of passing a flame-retardant B1 grade test, and the main technical content of the invention is explained in detail by a plurality of embodiments. In embodiment 1, the technical contents of the present invention are clearly and specifically explained with reference to the drawings of the specification, i.e., fig. 1, in embodiment 5, the technical contents of the present invention are clearly and specifically explained with reference to the drawings of the specification, i.e., fig. 2 and fig. 3, in other embodiments, although the drawings are not separately drawn, the main structures of the embodiments can still refer to the drawings of embodiment 1.
It is expressly noted here that the drawings of the present invention are schematic and have been simplified in unnecessary detail for the purpose of clarity and to avoid obscuring the technical solutions that the present invention contributes to the prior art.
Example 1
Referring to fig. 1, the twisted cable core is provided with an inner ceramic fiber belt layer 4, a mirror surface metal composite belt layer 5, an oxygen separation layer 6, an outer ceramic fiber belt layer 8 and a sheath layer 9 which are sequentially coated on the cable core from inside to outside, a ceramic fiber cotton filling layer 3 is filled in a combined gap of the cable core coated by the inner ceramic fiber belt layer 4, and the cable core is filled into a whole circle by the ceramic fiber cotton filling layer 3.
Wherein, the cable core is provided with four insulated conductors. Each insulated conductor of the cable core mainly comprises a conductor 1 and an insulating layer 2 coated on the conductor 1, wherein the conductor 1 is a 1 st copper conductor in the standard GB/T3956 and is in a single-stranded copper wire structure; the insulating layer 2 is an extruded layer structure of irradiation type cross-linked polyolefin. Four insulated conductors of the cable core are combined together in a twisting mode, and a ceramic fiber cotton filling layer 3 is filled in twisting gaps of the four insulated conductors, so that the cable core is tightly filled.
The inner ceramic fiber belt layer 4 is a compact lapping structure of a ceramic fiber belt.
The mirror surface metal composite belt layer 5 is a two-layer compact lapping structure of a mirror surface aluminum-plastic composite belt.
The oxygen isolation layer 6 is an extruded layer structure of low-smoke halogen-free polyolefin. The oxygen-insulating layer 6 is made of low-smoke halogen-free polyolefin material, which takes polyolefin as a base material and is filled with a large amount of inorganic flame retardant, so that the components of organic matters can be reduced to the maximum extent, the oxygen index of the material reaches 45 percent, and the flame retardant property of the material is greatly improved, thereby playing the roles of insulating oxygen, insulating heat and suppressing smoke.
The outer ceramic fiber belt layer 8 is a compact lapping structure of the ceramic fiber belt.
The sheath layer 9 is an extruded layer structure of irradiation type flame-retardant low-smoke halogen-free flame-retardant polyolefin, and can be replaced by non-irradiation type low-smoke halogen-free flame-retardant polyolefin material.
The ceramic fiber cotton filling layer, the inner ceramic fiber belt layer and the outer ceramic fiber belt layer are respectively formed by ceramic fiber materials, the ceramic fiber materials are aluminum silicate refractory fibers, hard clay clinker or industrial alumina powder and silica powder synthetic materials are used as raw materials, the raw materials are melted by an electric arc furnace or a resistance furnace, and the raw materials are subjected to fiber forming by a compressed air blowing (or wire throwing method), the chemical components of the ceramic fiber cotton filling layer, the inner ceramic fiber belt layer and the outer ceramic fiber belt layer are mainly aluminum oxide (30-55%) and silicon dioxide, and the ceramic fiber cotton filling layer, the inner ceramic fiber belt layer and the outer ceramic fiber belt layer are formed by reprocessing, have the characteristics of low heat capacity, low heat conductivity, excellent thermal stability and high temperature resistance of more than. It should be noted that the ceramic fiber material is the existing finished material, and the contribution of the invention to the prior art is not the material per se.
Example 2
The cable core is provided with a stranded cable core, an inner ceramic fiber belt layer, a mirror surface metal composite belt layer, an oxygen isolation layer, an outer ceramic fiber belt layer and a sheath layer are sequentially coated on the cable core from inside to outside, a ceramic fiber cotton filling layer is filled in a combined gap of the cable core coated by the inner ceramic fiber belt layer, and the cable core is filled into a whole circle by the ceramic fiber cotton filling layer.
Wherein, the cable core is provided with four insulated conductors. Each insulated conductor of the cable core mainly comprises a conductor and an insulating layer coated on the conductor, wherein the conductor is a 2 nd copper conductor in the standard GB/T3956 and is in a multi-strand copper wire stranded structure; the insulating layer is an extruded layer structure of irradiation type cross-linked polyolefin. Four insulated conductors of the cable core are combined together in a twisting mode, and a ceramic fiber cotton filling layer is filled in twisting gaps of the four insulated conductors, so that the cable core is tightly filled.
The inner ceramic fiber belt layer is a two-layer compact wrapping structure of the ceramic fiber belt.
The mirror surface metal composite belt layer is a three-layer compact lapping structure of a mirror surface aluminum-plastic composite belt.
The oxygen isolation layer is an extruded layer structure of low-smoke halogen-free polyolefin. The oxygen-isolating layer is made of low-smoke halogen-free polyolefin material, which is a component using polyolefin as a base material and filled with a large amount of inorganic flame retardant, and can reduce organic matters to the maximum extent, so that the oxygen index of the material reaches 45%, and further the flame retardant property of the material is greatly improved, so as to play roles of isolating oxygen, insulating heat and suppressing smoke.
The outer ceramic fiber belt layer is a compact lapping structure of the ceramic fiber belt.
The sheath layer is an extruded layer structure of irradiation type flame-retardant low-smoke halogen-free flame-retardant polyolefin, and can be replaced by non-irradiation type low-smoke halogen-free flame-retardant polyolefin material.
Example 3
The cable core is provided with a stranded cable core, an inner ceramic fiber belt layer, a mirror surface metal composite belt layer, an oxygen isolation layer, an outer ceramic fiber belt layer and a sheath layer are sequentially coated on the cable core from inside to outside, a ceramic fiber cotton filling layer is filled in a combined gap of the cable core coated by the inner ceramic fiber belt layer, and the cable core is filled into a whole circle by the ceramic fiber cotton filling layer.
Wherein, the cable core is provided with four insulated conductors. Each insulated conductor of the cable core mainly comprises a conductor and an insulating layer coated on the conductor, wherein the conductor is a 5 th soft copper conductor in the standard GB/T3956 and is in a multi-strand copper wire stranded structure; the insulating layer is an extruded layer structure of irradiation type cross-linked polyolefin. Four insulated conductors of the cable core are combined together in a twisting mode, and a ceramic fiber cotton filling layer is filled in twisting gaps of the four insulated conductors, so that the cable core is tightly filled.
The inner ceramic fiber belt layer is a compact lapping structure of the ceramic fiber belt.
The mirror surface metal composite belt layer is a two-layer compact lapping structure of a mirror surface aluminum-plastic composite belt.
The oxygen isolation layer is an extruded layer structure of low-smoke halogen-free polyolefin. The oxygen-isolating layer is made of low-smoke halogen-free polyolefin material, which is a component using polyolefin as a base material and filled with a large amount of inorganic flame retardant, and can reduce organic matters to the maximum extent, so that the oxygen index of the material reaches 45%, and further the flame retardant property of the material is greatly improved, so as to play roles of isolating oxygen, insulating heat and suppressing smoke.
The outer ceramic fiber belt layer is a two-layer compact wrapping structure of the ceramic fiber belt.
The sheath layer is an extruded layer structure of irradiation type flame-retardant low-smoke halogen-free flame-retardant polyolefin, and can be replaced by non-irradiation type low-smoke halogen-free flame-retardant polyolefin material.
Example 4
the cable core is provided with a stranded cable core, an inner ceramic fiber belt layer, an oxygen separation layer, an outer ceramic fiber belt layer and a sheath layer are sequentially coated on the cable core from inside to outside, a ceramic fiber cotton filling layer is filled in a combined gap of the cable core coated by the inner ceramic fiber belt layer, and the cable core is filled into a whole circle by the ceramic fiber cotton filling layer.
Wherein, the cable core is provided with four insulated conductors. Each insulated conductor of the cable core mainly comprises a conductor and an insulating layer coated on the conductor, wherein the conductor is a 2 nd copper conductor in the standard GB/T3956 and is in a multi-strand copper wire stranded structure; the insulating layer is an extruded layer structure of irradiation type cross-linked polyolefin. Four insulated conductors of the cable core are combined together in a twisting mode, and a ceramic fiber cotton filling layer is filled in twisting gaps of the four insulated conductors, so that the cable core is tightly filled.
The inner ceramic fiber belt layer is a three-layer compact wrapping structure of the ceramic fiber belt.
The oxygen isolation layer is an extruded layer structure of low-smoke halogen-free polyolefin. The oxygen-isolating layer is made of low-smoke halogen-free polyolefin material, which is a component using polyolefin as a base material and filled with a large amount of inorganic flame retardant, and can reduce organic matters to the maximum extent, so that the oxygen index of the material reaches 45%, and further the flame retardant property of the material is greatly improved, so as to play roles of isolating oxygen, insulating heat and suppressing smoke.
The outer ceramic fiber belt layer is a three-layer compact wrapping structure of the ceramic fiber belt.
The sheath layer is an extruded layer structure of irradiation type flame-retardant low-smoke halogen-free flame-retardant polyolefin, and can be replaced by non-irradiation type low-smoke halogen-free flame-retardant polyolefin material.
Example 5
Referring to fig. 2 and 3, the twisted cable core is provided, an inner ceramic fiber band layer 4, a mirror surface metal composite band layer 5, an oxygen barrier layer 6, a temperature reduction layer 7, an outer ceramic fiber band layer 8 and a sheath layer 9 are sequentially coated on the cable core from inside to outside, a ceramic fiber cotton filling layer 3 is filled in a combined gap of the cable core coated by the inner ceramic fiber band layer 4, and the cable core is filled with the ceramic fiber cotton filling layer 3 to be round.
Wherein, the cable core is provided with four insulated conductors. Each insulated conductor of the cable core mainly comprises a conductor 1 and an insulating layer 2 coated on the conductor 1, wherein the conductor 1 is a 1 st copper conductor in the standard GB/T3956 and is in a single-stranded copper wire structure; the insulating layer 2 is an extruded layer structure of irradiation type cross-linked polyolefin. Four insulated conductors of the cable core are combined together in a twisting mode, and a ceramic fiber cotton filling layer 3 is filled in twisting gaps of the four insulated conductors, so that the cable core is tightly filled.
The inner ceramic fiber belt layer 4 is a compact lapping structure of a ceramic fiber belt.
The mirror surface metal composite belt layer 5 is a two-layer compact lapping structure of a mirror surface aluminum-plastic composite belt.
The oxygen isolation layer 6 is an extruded layer structure of low-smoke halogen-free polyolefin. The oxygen-insulating layer 6 is made of low-smoke halogen-free polyolefin material, which takes polyolefin as a base material and is filled with a large amount of inorganic flame retardant, so that the components of organic matters can be reduced to the maximum extent, the oxygen index of the material reaches 45 percent, and the flame retardant property of the material is greatly improved, thereby playing the roles of insulating oxygen, insulating heat and suppressing smoke.
The cooling layer 7 is a molding structure in which aluminum hydroxide filler (or magnesium hydroxide filler) is filled in a hollow cavity, specifically, the cooling layer 7 is composed of a plurality of small-diameter hollow tubes 71 circumferentially distributed outside the oxygen isolation layer 6 and filler 72 (namely, aluminum hydroxide filler or magnesium hydroxide filler) filled in each hollow tube 71, and each hollow tube 71 is an extrusion structure of flame-retardant low-smoke halogen-free polyolefin.
The outer ceramic fiber belt layer 8 is a compact lapping structure of the ceramic fiber belt.
The sheath layer 9 is an extruded layer structure of irradiation type flame-retardant low-smoke halogen-free flame-retardant polyolefin, and can be replaced by non-irradiation type low-smoke halogen-free flame-retardant polyolefin material.
The ceramic fiber cotton filling layer, the inner ceramic fiber belt layer and the outer ceramic fiber belt layer are respectively formed by ceramic fiber materials, the ceramic fiber materials are aluminum silicate refractory fibers, hard clay clinker or industrial alumina powder and silica powder synthetic materials are used as raw materials, the raw materials are melted by an electric arc furnace or a resistance furnace, and the raw materials are subjected to fiber forming by a compressed air blowing (or wire throwing method), the chemical components of the ceramic fiber cotton filling layer, the inner ceramic fiber belt layer and the outer ceramic fiber belt layer are mainly aluminum oxide (30-55%) and silicon dioxide, and the ceramic fiber cotton filling layer, the inner ceramic fiber belt layer and the outer ceramic fiber belt layer are formed by reprocessing, have the characteristics of low heat capacity, low heat conductivity, excellent thermal stability and high temperature resistance of more than. It should be noted that the ceramic fiber material is the existing finished material, and the contribution of the invention to the prior art is not the material per se.
the above examples are intended to illustrate the invention, but not to limit it. Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: the specific technical solutions in the above embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the present invention in its essence.
Claims (10)
1. A flame retardant class B1 cable having a core consisting essentially of a plurality of insulated conductors, wherein: the cable core is sequentially coated with an inner ceramic fiber belt layer (4), an oxygen separation layer (6), an outer ceramic fiber belt layer (8) and a sheath layer (9) from inside to outside, and a combined gap of the cable core coated by the inner ceramic fiber belt layer (4) is filled with a ceramic fiber cotton filling layer (3).
2. The flame retardant B1 grade cable of claim 1, wherein: and a mirror surface metal composite belt layer (5) is coated between the inner ceramic fiber belt layer (4) and the oxygen isolation layer (6).
3. The flame retardant B1 grade cable of claim 2, wherein: the mirror surface metal composite belt layer (5) is of at least one layer of lapping structure of a mirror surface aluminum-plastic composite belt.
4. The flame retardant B1 grade cable of claim 1 or 2, wherein: the inner ceramic fiber belt layer (4) is of at least one layer of wrapping structure of the ceramic fiber belt.
5. The flame retardant B1 grade cable of claim 1, wherein: a cooling layer (7) is coated between the oxygen insulation layer (6) and the outer ceramic fiber tape layer (8), and the cooling layer (7) is a molding structure with a hollow cavity filled with aluminum hydroxide or magnesium hydroxide filler.
6. The flame retardant B1 grade cable of claim 5, wherein: the cooling layer (7) is composed of a plurality of hollow pipes (71) which are arranged in the circumferential direction and a filler (72) filled in each hollow pipe (71).
7. The flame retardant B1 grade cable of claim 1, 2 or 5, wherein: the oxygen isolation layer (6) is of a low-smoke halogen-free polyolefin extrusion layer structure.
8. The flame retardant B1 grade cable of claim 1 or 5, wherein: the outer ceramic fiber belt layer (8) is at least one layer of wrapping structure of the ceramic fiber belt.
9. The flame retardant B1 grade cable of claim 1, wherein: the sheath layer (9) is of a low-smoke halogen-free flame-retardant polyolefin extrusion layer structure.
10. The flame retardant B1 grade cable of claim 1, wherein: a plurality of insulated conductors of the cable core are twisted together, and a ceramic fiber cotton filling layer (3) is filled in a twisting gap; each insulated conductor of the cable core mainly comprises a conductor (1) and an insulating layer (2) coated on the conductor (1), wherein the conductor (1) is a 1 st copper conductor, a 2 nd copper conductor or a 5 th soft copper conductor in the standard GB/T3956, and the insulating layer (2) is an extruded layer structure of irradiation type cross-linked polyolefin; the conductor (1) is of a single-strand copper wire structure or a multi-strand copper wire stranded structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910900275.3A CN110570981A (en) | 2019-09-23 | 2019-09-23 | Flame-retardant B1-grade cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910900275.3A CN110570981A (en) | 2019-09-23 | 2019-09-23 | Flame-retardant B1-grade cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110570981A true CN110570981A (en) | 2019-12-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910900275.3A Pending CN110570981A (en) | 2019-09-23 | 2019-09-23 | Flame-retardant B1-grade cable |
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| Country | Link |
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| CN (1) | CN110570981A (en) |
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| CN113178279A (en) * | 2020-01-24 | 2021-07-27 | 上海诺基亚贝尔股份有限公司 | Fire-resistant multi-conductor cable |
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