CN116705404A - Insulating fire-resistant cable and manufacturing method thereof - Google Patents
Insulating fire-resistant cable and manufacturing method thereof Download PDFInfo
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- CN116705404A CN116705404A CN202310808350.XA CN202310808350A CN116705404A CN 116705404 A CN116705404 A CN 116705404A CN 202310808350 A CN202310808350 A CN 202310808350A CN 116705404 A CN116705404 A CN 116705404A
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- fire
- resistant
- retarding
- layer
- sealing plate
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- 230000009970 fire resistant effect Effects 0.000 title claims abstract description 190
- 238000004519 manufacturing process Methods 0.000 title claims description 11
- 230000002093 peripheral effect Effects 0.000 claims abstract description 9
- 239000003063 flame retardant Substances 0.000 claims description 115
- 238000007789 sealing Methods 0.000 claims description 59
- 239000000463 material Substances 0.000 claims description 38
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 23
- 229920001971 elastomer Polymers 0.000 claims description 17
- 239000003431 cross linking reagent Substances 0.000 claims description 15
- 239000000843 powder Substances 0.000 claims description 15
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 10
- 238000007670 refining Methods 0.000 claims description 10
- 239000011347 resin Substances 0.000 claims description 10
- 229920005989 resin Polymers 0.000 claims description 10
- BIKXLKXABVUSMH-UHFFFAOYSA-N trizinc;diborate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]B([O-])[O-].[O-]B([O-])[O-] BIKXLKXABVUSMH-UHFFFAOYSA-N 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 7
- 238000005520 cutting process Methods 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- 238000010074 rubber mixing Methods 0.000 claims description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 4
- 239000002041 carbon nanotube Substances 0.000 claims description 4
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 4
- 239000000395 magnesium oxide Substances 0.000 claims description 4
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 4
- 239000002105 nanoparticle Substances 0.000 claims description 4
- 229920001084 poly(chloroprene) Polymers 0.000 claims description 4
- 229910052717 sulfur Inorganic materials 0.000 claims description 4
- 239000011593 sulfur Substances 0.000 claims description 4
- XMNIXWIUMCBBBL-UHFFFAOYSA-N 2-(2-phenylpropan-2-ylperoxy)propan-2-ylbenzene Chemical compound C=1C=CC=CC=1C(C)(C)OOC(C)(C)C1=CC=CC=C1 XMNIXWIUMCBBBL-UHFFFAOYSA-N 0.000 claims description 3
- 229920002943 EPDM rubber Polymers 0.000 claims description 3
- 244000043261 Hevea brasiliensis Species 0.000 claims description 3
- 229920003052 natural elastomer Polymers 0.000 claims description 3
- 229920001194 natural rubber Polymers 0.000 claims description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 2
- 238000002485 combustion reaction Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 4
- 230000009467 reduction Effects 0.000 abstract description 2
- 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 description 70
- 238000009792 diffusion process Methods 0.000 description 9
- 230000009471 action Effects 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 6
- 239000004743 Polypropylene Substances 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 238000003763 carbonization Methods 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 239000011888 foil Substances 0.000 description 3
- 239000003365 glass fiber Substances 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 239000010445 mica Substances 0.000 description 3
- 229910052618 mica group Inorganic materials 0.000 description 3
- 239000004745 nonwoven fabric Substances 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- -1 polypropylene Polymers 0.000 description 3
- 229920001155 polypropylene Polymers 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 239000011819 refractory material Substances 0.000 description 3
- 239000013589 supplement Substances 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005253 cladding Methods 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 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
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Insulated Conductors (AREA)
Abstract
The invention discloses an insulating fire-resistant cable, which comprises a cable core, a fire-resistant inner sheath sleeved outside the cable core, a fire-resistant outer sheath sleeved outside the fire-resistant inner sheath, and a fire-resistant structure arranged on the fire-resistant inner sheath and the fire-resistant outer sheath, wherein the fire-resistant structure comprises an inner fire-resistant part arranged in the fire-resistant inner sheath, an outer fire-resistant part arranged in the fire-resistant outer sheath, the inner fire-resistant part comprises a first fire-resistant layer clamped at the central position of the cable core, and a second fire-resistant layer coated at the peripheral position of the cable core, a fire-resistant channel is arranged between every two second fire-resistant layers of the fire-resistant inner sheath, and the outer fire-resistant part comprises a plurality of third fire-resistant layers coated outside the fire-resistant channel; the insulated fireproof cable can not only be used for keeping normal operation for a certain time under the condition of external flame combustion, but also be used for flame retardance when a combustion surface is enlarged, so that the reduction of a fireproof effect is avoided.
Description
Technical Field
The invention relates to an insulated fire-resistant cable and a manufacturing method thereof.
Background
The insulated fire-resistant cable is a cable which can keep safe operation for a certain time under the condition of flame burning. The insulated fireproof cable is widely applied to places related to fire protection safety and fire protection lifesaving, such as high-rise buildings, underground railways, underground streets, large power stations, important industrial and mining enterprises and the like.
Existing insulated fire resistant cables such as those of application number 201580085186.8, which disclose "comprising a conductor (110), a first semiconductive layer (120) arranged in a radially outer position with respect to the conductor (110), an insulating layer (130) arranged in a radially outer position with respect to the first semiconductive layer (120) and in direct contact with the first semiconductive layer (120), a second semiconductive layer (140) arranged in a radially outer position with respect to the insulating layer (130) and in direct contact with the insulating layer (130), a conductive shield (150) arranged in a radially outer position with respect to the second semiconductive layer (140), a thermal barrier layer (165) arranged in a radially outer position with respect to the conductive shield (150), the thermal barrier layer (165) comprising a layer made of a fire resistant or flame retardant layer halogen-free material, a rubberized glass fiber tape (190) arranged in a radially outer position with respect to the first semiconductive layer (120), a fire resistant outer jacket (200) arranged in a radially outer position with respect to the rubberized glass fiber tape (190) and in direct contact with the rubberized surface of the rubberized glass fiber tape (190)", such fire resistant cables being a flame resistant cable having a flame resistant performance that is greatly degraded depending on the flame resistant surface of the cable's flame-resistant performance that is normally extended over time, which is also lost with a high flame resistance performance.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the insulated fireproof cable which can not only be used for keeping normal operation for a certain time under the condition of external flame combustion, but also be used for flame retardance when the combustion surface is enlarged, thereby avoiding the reduction of the fireproof effect, and the manufacturing method thereof.
The technical scheme adopted for solving the technical problems is as follows:
the utility model provides an insulating fire-resistant cable, including the cable core, and the suit is in the outer fire-resistant inner sheath of cable core, and the suit is in the outer fire-resistant oversheath of fire-resistant inner sheath, and install the fire-retardant structure on fire-resistant inner sheath and fire-resistant oversheath, this fire-retardant structure is including installing the internal fire-retardant portion in fire-resistant inner sheath, and install the outer fire-retardant portion in fire-resistant oversheath, this internal fire-retardant portion is including pressing from both sides the first fire-retardant layer of locating cable core central point, and the cladding is at the second fire-retardant layer of cable core periphery position, this fire-resistant inner sheath is equipped with the fire-retardant passageway in two liang of second fire-retardant layer department, this outer fire-retardant portion is including a plurality of cladding third fire-retardant layers outside the fire-retardant passageway.
Preferably, an inner sealing plate for separating the extending direction is arranged in the fireproof inner sheath, and the first fire-resistant layer and the second fire-resistant layer are accommodated in an accommodating space formed by the inner sealing plate.
Preferably, an outer sealing plate for separating the extending direction is arranged in the fireproof outer sheath, and the third fireproof layer is accommodated in an accommodating space formed by the outer sealing plate.
Preferably, the inner closing plate is provided with a cable core hole through which the cable core passes.
Preferably, the first, second and third flame retardant layers are filled with a thermally expandable flame retardant material.
Preferably, a gap is arranged between the adjacent second fire-retarding layers, and the gap length is consistent with the length of the fire-retarding channel on the fire-retarding inner sheath and is communicated with the fire-retarding channel.
The invention aims to provide an insulating fire-resistant cable, which comprises 80-120 parts by weight of rubber, 30-100 parts by weight of aluminum hydroxide, 30-50 parts by weight of zinc borate, 0.5-30 parts by weight of expanded graphite powder, 10-80 parts by weight of heat-conducting and electric-conducting powder, 5-40 parts by weight of organic resin and 1.5-3.5 parts by weight of cross-linking agent.
Preferably, the rubber is one or more of ethylene propylene diene monomer rubber, chloroprene rubber and natural rubber, and the cross-linking agent comprises one or more of dicumyl peroxide, magnesium oxide and sulfur; the heat-conducting and electric-conducting powder is one or more of silver powder, carbon nano tubes and alumina nano particles.
Another technical problem to be solved by the present invention is to provide a method for manufacturing an insulated refractory cable, comprising the following steps:
the first fire-resistant layer is arranged at the center of the plurality of cable core wires at intervals, the plurality of cable core wires are stranded into a whole bundle, and the first fire-resistant layer is fixed by adopting an inner sealing plate;
the second fire-resistant layers are arranged at intervals at the peripheral positions of the plurality of cable core wires, are positioned at the same arrangement position as the first fire-resistant layers, and are fixed by adopting an inner sealing plate;
coating a cable core wire with a first fire-retarding layer and a second fire-retarding layer by adopting a fire-retarding inner sheath, and arranging a fire-retarding channel on the fire-retarding inner sheath at the position corresponding to the first fire-retarding layer and the second fire-retarding layer;
paving a third fire-retarding layer on the fire-retarding channel, and fixing the third fire-retarding layer by adopting an outer sealing plate;
and (3) coating the fireproof inner sheath with the third fireproof layer by adopting the fireproof outer sheath.
Preferably, the method for preparing the first, second and third fire-resistant layers comprises the following steps:
rubber, aluminum hydroxide, zinc borate, expanded graphite powder and heat and electric conduction powder are put into organic resin to be mixed, and a cross-linking agent is added in the mixing process;
placing the mixed material after mixing on a rubber mixing machine for hot refining, cutting the mixed material to the size of a containing space formed by an inner sealing plate and an outer sealing plate after hot refining, and vulcanizing the mixed material at a preset temperature for 30-90 min to obtain a first fire-resistant layer, a second fire-resistant layer and a third fire-resistant layer;
the first fire-resistant layer and the second fire-resistant layer are placed in the accommodating space formed by the inner sealing plate, and the third fire-resistant layer is placed in the accommodating space formed by the outer sealing plate.
The beneficial effects of the invention are as follows:
when current fire-resistant inner sheath and fire-resistant oversheath realize fire-resistant purpose, the interval has set up fire-retardant structure in fire-resistant inner sheath and fire-resistant oversheath, it carries out the spaced type and blocks when the cable burning face enlarges through burning expanded rubber material, the combustion collision material is continuous the expansion from the low temperature stage of initial stage to the whole in-process of high temperature stage, the effectual expansion of preventing the burning face, thereby avoid fire-resistant cable's fire resistance to reduce, still adopted the fire-retardant structure of combination on first fire-retardant layer, second fire-retardant layer and third fire-retardant layer simultaneously, carry out complete parcel nature to cable heart yearn department when can expanding and cut off, its separation effect is better.
Drawings
Fig. 1 is an overall construction diagram of an insulated fire-resistant cable of the invention.
Fig. 2 is a front view of a fire-retarding construction of an insulated fire-resistant cable of the present invention.
Fig. 3 is a schematic view of the internal structure of the fire-retarding construction of the insulated fire-resistant cable of the present invention.
Detailed Description
The principles and features of the present invention are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention. The invention is more particularly described by way of example in the following paragraphs with reference to the drawings. Advantages and features of the invention will become more apparent from the following description and from the claims. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for convenience and clarity in aiding in the description of embodiments of the invention.
In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Example 1
Referring to fig. 1-3, an insulated fire-resistant cable comprises a cable core 1, a fire-resistant inner sheath 2 sleeved outside the cable core 1, a fire-resistant outer sheath 3 sleeved outside the fire-resistant inner sheath 2, and a fire-resistant structure 4 installed on the fire-resistant inner sheath 2 and the fire-resistant outer sheath 3, wherein the fire-resistant structure 4 comprises an inner fire-resistant part 41 installed in the fire-resistant inner sheath 2, and an outer fire-resistant part 42 installed in the fire-resistant outer sheath 3, the inner fire-resistant part 41 comprises a first fire-resistant layer 411 clamped at the central position of the cable core 1, and a second fire-resistant layer 412 coated at the peripheral position of the cable core, the fire-resistant inner sheath 2 is provided with fire-resistant channels 5 between every two second fire-resistant layers 412, and the outer fire-resistant part 42 comprises a plurality of third fire-resistant layers 421 coated outside the fire-resistant channels 5.
The installation of fire-retardant structure 4 has been adopted in this scheme, cut off the central point of cable core 1 through first fire-retardant layer 411, cut off the periphery position of cable core 1 through second fire-retardant layer 412 to along with the rise of temperature when burning, cut off the central point and the periphery position of cable core 1 completely, still adopted the design of third fire-retardant layer 421 simultaneously, it can be to the clearance department between two liang of second fire-retardant layers 412 and cable heart yearn outside supplement, carry out the complete wall to cable heart yearn and outside burning surface, thereby avoided the expansion of burning surface.
In this scheme, the gaps between the fireproof inner sheath 2 and the fireproof outer sheath 3, where the fireproof structure 4 is not provided, are filled with fireproof materials such as polypropylene tapes, non-woven fabrics, PVC cable wrapping tapes, mica tapes, aluminum foil tapes, and the like.
An inner sealing plate for separating the extending direction is arranged in the fireproof inner sheath 2, the first fireproof layer 411 and the second fireproof layer 412 are accommodated in an accommodating space formed by the inner sealing plate, an outer sealing plate for separating the extending direction is arranged in the fireproof outer sheath 3, the third fireproof layer 421 is accommodated in an accommodating space formed by the outer sealing plate, a cable core wire hole which can enable a cable core wire to penetrate through is formed in the inner sealing plate, the first fireproof layer 411, the second fireproof layer 412 and the third fireproof layer 421 are filled by thermal expansion fireproof materials, gaps are formed between the adjacent second fireproof layers 412, and the gap length is consistent with the length of a fireproof channel 5 on the fireproof inner sheath 2 and is communicated with the fireproof channel 5.
In this scheme, the mode that has adopted interior closure plate holds first flame retardant layer 411 and second flame retardant layer 412 to and the mode of outer closure plate holds third flame retardant layer 421, thereby make and form the wall between first flame retardant layer 411, second flame retardant layer 412 and third flame retardant layer 421 and the refractory material, avoid the expansion direction of meeting thermal expansion flame retardant material to the direction diffusion of extension, still adopted the design of fire-retardant passageway 5 simultaneously, make whole meeting thermal expansion flame retardant material can mainly expand the diffusion to cable heart yearn direction, thereby protect and hinder the fire and cut off cable heart yearn position.
The insulating fire-resistant cable comprises 80 parts by weight of rubber, 30 parts by weight of aluminum hydroxide, 30 parts by weight of zinc borate, 0.5 part by weight of expanded graphite powder, 10 parts by weight of heat-conducting and electric-conducting powder, 5 parts by weight of organic resin and 1.5 parts by weight of cross-linking agent, wherein the rubber is ethylene propylene diene monomer rubber, and the cross-linking agent comprises dicumyl peroxide; the heat-conducting and electric-conducting powder is a carbon nano tube.
The thermal expansion fire-retardant material is characterized in that the expanded graphite powder is dehydrated into carbon under the action of a carbonization catalyst, and a fluffy carbon layer with a pore closed structure is formed under the action of gas decomposed by an expanding agent. Once formed, it is inherently non-flammable and may impair thermal conduction between the polymer and the heat source and prevent gas diffusion.
A method of manufacturing an insulated fire resistant cable comprising the steps of:
the first fire-resistant layer 411 is placed at intervals in the center position of the plurality of cable core wires, the plurality of cable core wires are stranded into a whole bundle, and the first fire-resistant layer 411 is fixed by adopting an inner sealing plate;
the second fire-resistant layers 412 are arranged at intervals at the peripheral positions of the plurality of cable cores, are positioned at the same arrangement position as the first fire-resistant layers 411, and the second fire-resistant layers 412 are fixed by adopting an inner sealing plate;
the cable core wire with the first flame-retardant layer 411 and the second flame-retardant layer 412 is coated by adopting a flame-retardant inner sheath 2, and a flame-retardant channel 5 is arranged on the flame-retardant inner sheath 2 at the position corresponding to the first flame-retardant layer 411 and the second flame-retardant layer 412;
paving a third flame retardant layer 421 on the flame retardant channel 5, and fixing the third flame retardant layer 421 by adopting an outer sealing plate;
the fire-resistant inner sheath 2 with the third fire-resistant layer 421 is coated by the fire-resistant outer sheath 3.
The preparation method of the first, second and third fire-resistant layers 411, 412 and 421 comprises the following steps:
rubber, aluminum hydroxide, zinc borate, expanded graphite powder and heat and electric conduction powder are put into organic resin to be mixed, and a cross-linking agent is added in the mixing process;
placing the mixed material on a rubber mixing machine for hot refining, cutting the mixed material to the size of a containing space formed by an inner sealing plate and an outer sealing plate after hot refining, and vulcanizing the mixed material at a preset temperature for 30-90 min to obtain a first flame retardant layer 411, a second flame retardant layer 412 and a third flame retardant layer 421;
the first and second flame-retardant layers 411 and 412 are placed in the accommodating space formed by the inner sealing plate, and the third flame-retardant layer 421 is placed in the accommodating space formed by the outer sealing plate.
Example 2
Referring to fig. 1-3, an insulated fire-resistant cable comprises a cable core 1, a fire-resistant inner sheath 2 sleeved outside the cable core 1, a fire-resistant outer sheath 3 sleeved outside the fire-resistant inner sheath 2, and a fire-resistant structure 4 installed on the fire-resistant inner sheath 2 and the fire-resistant outer sheath 3, wherein the fire-resistant structure 4 comprises an inner fire-resistant part 41 installed in the fire-resistant inner sheath 2, and an outer fire-resistant part 42 installed in the fire-resistant outer sheath 3, the inner fire-resistant part 41 comprises a first fire-resistant layer 411 clamped at the central position of the cable core 1, and a second fire-resistant layer 412 coated at the peripheral position of the cable core, the fire-resistant inner sheath 2 is provided with fire-resistant channels 5 between every two second fire-resistant layers 412, and the outer fire-resistant part 42 comprises a plurality of third fire-resistant layers 421 coated outside the fire-resistant channels 5.
The installation of fire-retardant structure 4 has been adopted in this scheme, cut off the central point of cable core 1 through first fire-retardant layer 411, cut off the periphery position of cable core 1 through second fire-retardant layer 412 to along with the rise of temperature when burning, cut off the central point and the periphery position of cable core 1 completely, still adopted the design of third fire-retardant layer 421 simultaneously, it can be to the clearance department between two liang of second fire-retardant layers 412 and cable heart yearn outside supplement, carry out the complete wall to cable heart yearn and outside burning surface, thereby avoided the expansion of burning surface.
In this scheme, the gaps between the fireproof inner sheath 2 and the fireproof outer sheath 3, where the fireproof structure 4 is not provided, are filled with fireproof materials such as polypropylene tapes, non-woven fabrics, PVC cable wrapping tapes, mica tapes, aluminum foil tapes, and the like.
An inner sealing plate for separating the extending direction is arranged in the fireproof inner sheath 2, the first fireproof layer 411 and the second fireproof layer 412 are accommodated in an accommodating space formed by the inner sealing plate, an outer sealing plate for separating the extending direction is arranged in the fireproof outer sheath 3, the third fireproof layer 421 is accommodated in an accommodating space formed by the outer sealing plate, a cable core wire hole which can enable a cable core wire to penetrate through is formed in the inner sealing plate, the first fireproof layer 411, the second fireproof layer 412 and the third fireproof layer 421 are filled by thermal expansion fireproof materials, gaps are formed between the adjacent second fireproof layers 412, and the gap length is consistent with the length of a fireproof channel 5 on the fireproof inner sheath 2 and is communicated with the fireproof channel 5.
In this scheme, the mode that has adopted interior closure plate holds first flame retardant layer 411 and second flame retardant layer 412 to and the mode of outer closure plate holds third flame retardant layer 421, thereby make and form the wall between first flame retardant layer 411, second flame retardant layer 412 and third flame retardant layer 421 and the refractory material, avoid the expansion direction of meeting thermal expansion flame retardant material to the direction diffusion of extension, still adopted the design of fire-retardant passageway 5 simultaneously, make whole meeting thermal expansion flame retardant material can mainly expand the diffusion to cable heart yearn direction, thereby protect and hinder the fire and cut off cable heart yearn position.
The insulating fire-resistant cable comprises 120 parts by weight of rubber, 100 parts by weight of aluminum hydroxide, 50 parts by weight of zinc borate, 30 parts by weight of expanded graphite powder, 80 parts by weight of heat-conducting and electric-conducting powder, 40 parts by weight of organic resin and 3.5 parts by weight of cross-linking agent, wherein the rubber is neoprene, and the cross-linking agent comprises magnesium oxide and sulfur; the heat-conducting and electricity-conducting powder is alumina nano particles.
The thermal expansion fire-retardant material is characterized in that the expanded graphite powder is dehydrated into carbon under the action of a carbonization catalyst, and a fluffy carbon layer with a pore closed structure is formed under the action of gas decomposed by an expanding agent. Once formed, it is inherently non-flammable and may impair thermal conduction between the polymer and the heat source and prevent gas diffusion.
A method of manufacturing an insulated fire resistant cable comprising the steps of:
the first fire-resistant layer 411 is placed at intervals in the center position of the plurality of cable core wires, the plurality of cable core wires are stranded into a whole bundle, and the first fire-resistant layer 411 is fixed by adopting an inner sealing plate;
the second fire-resistant layers 412 are arranged at intervals at the peripheral positions of the plurality of cable cores, are positioned at the same arrangement position as the first fire-resistant layers 411, and the second fire-resistant layers 412 are fixed by adopting an inner sealing plate;
the cable core wire with the first flame-retardant layer 411 and the second flame-retardant layer 412 is coated by adopting a flame-retardant inner sheath 2, and a flame-retardant channel 5 is arranged on the flame-retardant inner sheath 2 at the position corresponding to the first flame-retardant layer 411 and the second flame-retardant layer 412;
paving a third flame retardant layer 421 on the flame retardant channel 5, and fixing the third flame retardant layer 421 by adopting an outer sealing plate;
the fire-resistant inner sheath 2 with the third fire-resistant layer 421 is coated by the fire-resistant outer sheath 3.
The preparation method of the first, second and third fire-resistant layers 411, 412 and 421 comprises the following steps:
rubber, aluminum hydroxide, zinc borate, expanded graphite powder and heat and electric conduction powder are put into organic resin to be mixed, and a cross-linking agent is added in the mixing process;
placing the mixed material on a rubber mixing machine for hot refining, cutting the mixed material to the size of a containing space formed by an inner sealing plate and an outer sealing plate after hot refining, and vulcanizing the mixed material at a preset temperature for 30-90 min to obtain a first flame retardant layer 411, a second flame retardant layer 412 and a third flame retardant layer 421;
the first and second flame-retardant layers 411 and 412 are placed in the accommodating space formed by the inner sealing plate, and the third flame-retardant layer 421 is placed in the accommodating space formed by the outer sealing plate.
Example 3
Referring to fig. 1-3, an insulated fire-resistant cable comprises a cable core 1, a fire-resistant inner sheath 2 sleeved outside the cable core 1, a fire-resistant outer sheath 3 sleeved outside the fire-resistant inner sheath 2, and a fire-resistant structure 4 installed on the fire-resistant inner sheath 2 and the fire-resistant outer sheath 3, wherein the fire-resistant structure 4 comprises an inner fire-resistant part 41 installed in the fire-resistant inner sheath 2, and an outer fire-resistant part 42 installed in the fire-resistant outer sheath 3, the inner fire-resistant part 41 comprises a first fire-resistant layer 411 clamped at the central position of the cable core 1, and a second fire-resistant layer 412 coated at the peripheral position of the cable core, the fire-resistant inner sheath 2 is provided with fire-resistant channels 5 between every two second fire-resistant layers 412, and the outer fire-resistant part 42 comprises a plurality of third fire-resistant layers 421 coated outside the fire-resistant channels 5.
The installation of fire-retardant structure 4 has been adopted in this scheme, cut off the central point of cable core 1 through first fire-retardant layer 411, cut off the periphery position of cable core 1 through second fire-retardant layer 412 to along with the rise of temperature when burning, cut off the central point and the periphery position of cable core 1 completely, still adopted the design of third fire-retardant layer 421 simultaneously, it can be to the clearance department between two liang of second fire-retardant layers 412 and cable heart yearn outside supplement, carry out the complete wall to cable heart yearn and outside burning surface, thereby avoided the expansion of burning surface.
In this scheme, the gaps between the fireproof inner sheath 2 and the fireproof outer sheath 3, where the fireproof structure 4 is not provided, are filled with fireproof materials such as polypropylene tapes, non-woven fabrics, PVC cable wrapping tapes, mica tapes, aluminum foil tapes, and the like.
An inner sealing plate for separating the extending direction is arranged in the fireproof inner sheath 2, the first fireproof layer 411 and the second fireproof layer 412 are accommodated in an accommodating space formed by the inner sealing plate, an outer sealing plate for separating the extending direction is arranged in the fireproof outer sheath 3, the third fireproof layer 421 is accommodated in an accommodating space formed by the outer sealing plate, a cable core wire hole which can enable a cable core wire to penetrate through is formed in the inner sealing plate, the first fireproof layer 411, the second fireproof layer 412 and the third fireproof layer 421 are filled by thermal expansion fireproof materials, gaps are formed between the adjacent second fireproof layers 412, and the gap length is consistent with the length of a fireproof channel 5 on the fireproof inner sheath 2 and is communicated with the fireproof channel 5.
In this scheme, the mode that has adopted interior closure plate holds first flame retardant layer 411 and second flame retardant layer 412 to and the mode of outer closure plate holds third flame retardant layer 421, thereby make and form the wall between first flame retardant layer 411, second flame retardant layer 412 and third flame retardant layer 421 and the refractory material, avoid the expansion direction of meeting thermal expansion flame retardant material to the direction diffusion of extension, still adopted the design of fire-retardant passageway 5 simultaneously, make whole meeting thermal expansion flame retardant material can mainly expand the diffusion to cable heart yearn direction, thereby protect and hinder the fire and cut off cable heart yearn position.
The insulating fire-resistant cable comprises 100 parts by weight of rubber, 60 parts by weight of aluminum hydroxide, 40 parts by weight of zinc borate, 15 parts by weight of expanded graphite powder, 40 parts by weight of heat-conducting and electric-conducting powder, 20 parts by weight of organic resin and 2 parts by weight of cross-linking agent, wherein the rubber is neoprene and natural rubber, and the cross-linking agent comprises magnesium oxide and sulfur; the heat-conducting and electricity-conducting powder is carbon nano tube and alumina nano particles.
The thermal expansion fire-retardant material is characterized in that the expanded graphite powder is dehydrated into carbon under the action of a carbonization catalyst, and a fluffy carbon layer with a pore closed structure is formed under the action of gas decomposed by an expanding agent. Once formed, it is inherently non-flammable and may impair thermal conduction between the polymer and the heat source and prevent gas diffusion.
A method of manufacturing an insulated fire resistant cable comprising the steps of:
the first fire-resistant layer 411 is placed at intervals in the center position of the plurality of cable core wires, the plurality of cable core wires are stranded into a whole bundle, and the first fire-resistant layer 411 is fixed by adopting an inner sealing plate;
the second fire-resistant layers 412 are arranged at intervals at the peripheral positions of the plurality of cable cores, are positioned at the same arrangement position as the first fire-resistant layers 411, and the second fire-resistant layers 412 are fixed by adopting an inner sealing plate;
the cable core wire with the first flame-retardant layer 411 and the second flame-retardant layer 412 is coated by adopting a flame-retardant inner sheath 2, and a flame-retardant channel 5 is arranged on the flame-retardant inner sheath 2 at the position corresponding to the first flame-retardant layer 411 and the second flame-retardant layer 412;
paving a third flame retardant layer 421 on the flame retardant channel 5, and fixing the third flame retardant layer 421 by adopting an outer sealing plate;
the fire-resistant inner sheath 2 with the third fire-resistant layer 421 is coated by the fire-resistant outer sheath 3.
The preparation method of the first, second and third fire-resistant layers 411, 412 and 421 comprises the following steps:
rubber, aluminum hydroxide, zinc borate, expanded graphite powder and heat and electric conduction powder are put into organic resin to be mixed, and a cross-linking agent is added in the mixing process;
placing the mixed material on a rubber mixing machine for hot refining, cutting the mixed material to the size of a containing space formed by an inner sealing plate and an outer sealing plate after hot refining, and vulcanizing the mixed material at a preset temperature for 30-90 min to obtain a first flame retardant layer 411, a second flame retardant layer 412 and a third flame retardant layer 421;
the first fire-resistant layer 411 and the second fire-resistant layer 412 are placed in the accommodating space formed by the inner sealing plate, and the third fire-resistant layer 421 is placed in the accommodating space formed by the outer sealing plate
The beneficial effects of the invention are as follows:
when current fire-resistant inner sheath and fire-resistant oversheath realize fire-resistant purpose, the interval has set up fire-retardant structure in fire-resistant inner sheath and fire-resistant oversheath, it carries out the spaced type and blocks when the cable burning face enlarges through burning expanded rubber material, the combustion collision material is continuous the expansion from the low temperature stage of initial stage to the whole in-process of high temperature stage, the effectual expansion of preventing the burning face, thereby avoid fire-resistant cable's fire resistance to reduce, still adopted the fire-retardant structure of combination on first fire-retardant layer, second fire-retardant layer and third fire-retardant layer simultaneously, carry out complete parcel nature to cable heart yearn department when can expanding and cut off, its separation effect is better.
The above-mentioned embodiments of the present invention are not intended to limit the scope of the present invention, and the embodiments of the present invention are not limited thereto, and all kinds of modifications, substitutions or alterations made to the above-mentioned structures of the present invention according to the above-mentioned general knowledge and conventional means of the art without departing from the basic technical ideas of the present invention shall fall within the scope of the present invention.
Claims (10)
1. The utility model provides an insulating fire-resistant cable, is including the cable core, and the suit is outside the fire-resistant inner sheath of cable core, and the suit is outside the fire-resistant oversheath of fire-resistant inner sheath, and installs the fire-retardant structure on fire-resistant inner sheath and fire-resistant oversheath, its characterized in that: the fire-retarding structure comprises an inner fire-retarding part arranged in a fire-retarding inner sheath and an outer fire-retarding part arranged in a fire-retarding outer sheath, wherein the inner fire-retarding part comprises a first fire-retarding layer clamped at the center of a cable core body and a second fire-retarding layer coated at the periphery of the cable core wire, a fire-retarding channel is arranged between every two second fire-retarding layers of the fire-retarding inner sheath, and the outer fire-retarding part comprises a plurality of third fire-retarding layers coated outside the fire-retarding channel.
2. The insulated refractory cable according to claim 1, wherein: an inner sealing plate for separating the extending direction is arranged in the fireproof inner sheath, and the first fire-resistant layer and the second fire-resistant layer are contained in a containing space formed by the inner sealing plate.
3. The insulated refractory cable according to claim 2, wherein: an outer sealing plate for separating the extending direction is arranged in the fireproof outer sheath, and the third fireproof layer is accommodated in an accommodating space formed by the outer sealing plate.
4. An insulated refractory cable according to claim 3, wherein: the inner sealing plate is provided with a cable core wire hole which can enable the cable core wire to pass through.
5. The insulated refractory cable according to any one of claims 1-4, wherein: the first, second and third fire-resistant layers are filled with a heat-expandable fire-resistant material.
6. The insulated refractory cable according to claim 5, wherein: gaps are arranged between the adjacent second fire-retarding layers, and the lengths of the gaps are consistent with the lengths of the fire-retarding channels on the fire-retarding inner sheath and are communicated with the fire-retarding channels.
7. An insulated fire resistant cable according to claim 5 or 6, wherein: the thermal expansion fire-retardant material comprises 80-120 parts by weight of rubber, 30-100 parts by weight of aluminum hydroxide, 30-50 parts by weight of zinc borate, 0.5-30 parts by weight of expanded graphite powder, 10-80 parts by weight of heat-conducting and electric-conducting powder, 5-40 parts by weight of organic resin and 1.5-3.5 parts by weight of cross-linking agent.
8. The insulated refractory cable according to claim 7, wherein: the rubber is one or more of ethylene propylene diene monomer, chloroprene rubber and natural rubber, and the cross-linking agent comprises one or more of dicumyl peroxide, magnesium oxide and sulfur; the heat-conducting and electric-conducting powder is one or more of silver powder, carbon nano tubes and alumina nano particles.
9. A method of manufacturing an insulated fire resistant cable comprising the steps of:
the first fire-resistant layer is arranged at the center of the plurality of cable core wires at intervals, the plurality of cable core wires are stranded into a whole bundle, and the first fire-resistant layer is fixed by adopting an inner sealing plate;
the second fire-resistant layers are arranged at intervals at the peripheral positions of the plurality of cable core wires, are positioned at the same arrangement position as the first fire-resistant layers, and are fixed by adopting an inner sealing plate;
coating a cable core wire with a first fire-retarding layer and a second fire-retarding layer by adopting a fire-retarding inner sheath, and arranging a fire-retarding channel on the fire-retarding inner sheath at the position corresponding to the first fire-retarding layer and the second fire-retarding layer;
paving a third fire-retarding layer on the fire-retarding channel, and fixing the third fire-retarding layer by adopting an outer sealing plate;
and (3) coating the fireproof inner sheath with the third fireproof layer by adopting the fireproof outer sheath.
10. The method of manufacturing an insulated fire resistant cable according to claim 9, wherein the method of manufacturing the first, second and third fire resistant layers comprises the steps of:
rubber, aluminum hydroxide, zinc borate, expanded graphite powder and heat and electric conduction powder are put into organic resin to be mixed, and a cross-linking agent is added in the mixing process;
placing the mixed material after mixing on a rubber mixing machine for hot refining, cutting the mixed material to the size of a containing space formed by an inner sealing plate and an outer sealing plate after hot refining, and vulcanizing the mixed material at a preset temperature for 30-90 min to obtain a first fire-resistant layer, a second fire-resistant layer and a third fire-resistant layer;
the first fire-resistant layer and the second fire-resistant layer are placed in the accommodating space formed by the inner sealing plate, and the third fire-resistant layer is placed in the accommodating space formed by the outer sealing plate.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117253666A (en) * | 2023-10-19 | 2023-12-19 | 建业电缆集团有限公司 | Low-smoke halogen-free mica mineral reinforced fireproof cable |
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- 2023-07-03 CN CN202310808350.XA patent/CN116705404A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117253666A (en) * | 2023-10-19 | 2023-12-19 | 建业电缆集团有限公司 | Low-smoke halogen-free mica mineral reinforced fireproof cable |
| CN117253666B (en) * | 2023-10-19 | 2024-03-01 | 建业电缆集团有限公司 | Low-smoke halogen-free mica mineral reinforced fireproof cable |
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