CN212484964U - Super-flexible ultra-long-time fire-resistant mineral insulated cable - Google Patents
Super-flexible ultra-long-time fire-resistant mineral insulated cable Download PDFInfo
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- CN212484964U CN212484964U CN202021397902.0U CN202021397902U CN212484964U CN 212484964 U CN212484964 U CN 212484964U CN 202021397902 U CN202021397902 U CN 202021397902U CN 212484964 U CN212484964 U CN 212484964U
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- 229910052500 inorganic mineral Inorganic materials 0.000 title claims abstract description 26
- 239000011707 mineral Substances 0.000 title claims abstract description 21
- 230000009970 fire resistant effect Effects 0.000 title claims description 49
- 239000010445 mica Substances 0.000 claims abstract description 21
- 229910052618 mica group Inorganic materials 0.000 claims abstract description 21
- 229920000098 polyolefin Polymers 0.000 claims abstract description 20
- 239000000919 ceramic Substances 0.000 claims abstract description 18
- 239000003063 flame retardant Substances 0.000 claims abstract description 15
- 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 claims abstract description 14
- 239000004020 conductor Substances 0.000 claims description 51
- 239000003365 glass fiber Substances 0.000 claims description 35
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 10
- 229910052802 copper Inorganic materials 0.000 claims description 10
- 239000010949 copper Substances 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 9
- 239000000779 smoke Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 5
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- 238000005452 bending Methods 0.000 abstract description 17
- 238000010276 construction Methods 0.000 abstract description 4
- 239000010410 layer Substances 0.000 description 91
- 238000009413 insulation Methods 0.000 description 12
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- 230000000694 effects Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 239000012774 insulation material Substances 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 239000002390 adhesive tape Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
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Abstract
The utility model discloses a super-flexible ultra-long refractory mineral insulated cable, belonging to the technical field of cables; the cable comprises a cable core, a fireproof layer and an outer sheath; the cable core is twisted and filled with flame retardant to form a cable core, and a fireproof layer and an outer sheath are sequentially wrapped outside the cable core; the wire core comprises a plurality of layers of mica tapes; the fireproof layer is made of ceramic polyolefin with the thickness of 1-3.5 mm, and a first wrapping layer and a second wrapping layer are arranged inside and outside the fireproof layer respectively; the utility model provides high cable's refractiveness, insulating nature and bending property reduce it and lay the degree of difficulty, and especially fire behaviour is showing, can guarantee under the refractory temperature 950 ~ 1000 ℃ circumstances that cable construction is complete and last circular telegram more than 5 hours.
Description
Technical Field
The utility model discloses a fire resisting cable especially relates to a fire resisting mineral insulated cable of super gentle type overlength, belongs to cable technical field.
Background
With the continuous development of society, the number of urban population is rapidly increasing, corresponding public facilities and places such as high-rise buildings, hotels and restaurants, large shopping malls, hospitals, stations and the like are also continuously increasing, the importance of fire safety is highlighted, and the power supply safety of important facilities is more and more important. How to ensure that power supply of electric power facilities is unobstructed within a certain time under the condition of fire, thereby prolonging the precious rescue time and reducing casualties and property loss caused by the fire, which is the subject of continuous research and exploration of people. Therefore, the fireproof performance of the electric wire and the electric cable is improved, the normal use of important facilities under the condition of fire disaster is ensured, and the time is especially important for fire fighting rescue.
Various fire-resistant cables are widely applied to various fields of society, and electric systems in places such as high-rise buildings, subways, airports and the like have higher and higher requirements on the fire resistance of the cables. The existing fire-resistant cable has the advantages of flame retardance, low fire resistance, heavy weight, easiness in moisture absorption, lower insulation resistance and short fire-resistant time; and the traditional mineral insulated cable structure is provided with a metal sheath, refractory clay and the like, so that the bending performance of the cable is poor.
The application number 201711345306.0 of the Chinese invention patent discloses a waterproof, rat-proof and termite-proof high-flexibility mineral insulation fireproof cable, which has the advantages of convenient field construction and installation, higher flexibility, no limitation on the length and section of the cable, excellent electrical performance and mechanical performance, single composition of a mica tape insulation layer, limited protection effect on a conductor and poor fire resistance; the fireproof layer is composed of an extruded high flame-retardant polyolefin oxygen-insulating layer and a ceramic polyolefin heat-insulating layer, the production and the manufacture are complex, and the fireproof layer is directly coated with a sheath layer; the fire resistance of the whole structure can only meet the requirement of a common fire-resistant cable.
Although the chinese utility model patents with application numbers 201820808508.8, 201821038966.4 and 201020650666.9 respectively mention that the inner insulating layer outside the conductor is wrapped by four layers of mica tape; however, the cable structure has common fire resistance, can only reach basic requirements, and cannot be combined with the Chinese patent application with the application number of 201711345306.0 to provide a cable structure which is flexible and has remarkably improved fire resistance.
SUMMERY OF THE UTILITY MODEL
Technical problem to be solved
The to-be-solved technical problem of the utility model is to solve current fireproof cable fire resistance low, the relatively poor scheduling problem of bending property.
(II) technical scheme
In order to solve the technical problem, the utility model provides a fire-resistant mineral insulated cable of super gentle type overlength, include: the cable comprises a wire core, a cable core, a fireproof layer and an outer sheath; the cable core is twisted and filled with flame retardant to form a cable core, and a fireproof layer and an outer sheath are sequentially wrapped outside the cable core; the fireproof layer is made of ceramic polyolefin with the thickness of 1-3.5 mm, and a first glass fiber belt and a second glass fiber belt are arranged inside and outside the fireproof layer in a closely attached mode.
Further, the wire core comprises a conductor, an insulating layer a wrapping the conductor and an insulating layer b wrapping the insulating layer a.
Furthermore, the conductor is a soft copper conductor and is formed by twisting a plurality of strands of soft round copper wires.
Furthermore, the insulating layer a is wrapped by 4 layers of synthetic mica tapes with the thickness of 0.14 +/-0.02 mm.
Further, the mica tape comprises 2 layers of 0.14x8mm and 2 layers of 0.14x10mm mica tape, and the 0.14x10mm mica tape is wrapped outside the 0.14x8mm mica tape.
Furthermore, the insulating layer b is extruded ceramic polyolefin with the thickness of 0.7 mm-0.9 mm.
Further, the flame retardant includes an inorganic mineral, which may be alkali-free glass fiber strands.
Further, the first glass fiber tape and the second glass fiber tape are alkali-free glass fiber tapes of 0.2X 50 mm.
Furthermore, the outer sheath is made of a 90-DEG C flame-retardant low-smoke halogen-free sheath material, and the extruded average thickness of the outer sheath is 1.8-2.0 mm.
The production process of the utility model comprises the following steps:
step one, preparing a conductor
The conductor is formed by twisting a plurality of strands of annealed soft round copper wires, the plurality of strands of soft copper wires are regularly twisted and molded at one time by using a frame twisting machine, and the conductor is tightly pressed while being twisted;
step two, wrapping an insulating layer a and extruding an insulating layer b
Wrapping insulating layer a
The insulating layer a is wrapped by a synthetic mica tape; the same specification can be adopted, and wrapping can also be carried out by adopting different specifications; and (3) winding mica tapes with various specifications of 0.14mm in thickness and 8-40 mm in width according to the outer diameter of the conductor, wherein the specification of the thickness and the width from small to large is adopted as the principle of using the conductor. The insulation wrapping adopts a multi-head horizontal wrapping machine, each layer is formed by one-time wrapping in a layering way according to the width from small to large, a positive lapping cover is adopted among the layers, the lapping rate is not less than 15% of the band width, and the joint of the mica tape wrapping layer is firmly bonded by a transparent adhesive tape with the width not more than 15 mm;
extruded insulation layer b
The extruded insulation layer b adopts a phi 65+ phi 45 plastic molding machine, a die is in a pipe extruding type, an extruding screw is a low-smoke halogen-free screw, and a screw sleeve is cleaned before starting; the extrusion material is ceramic polyolefin insulation material, and is baked and dried in a baking room at 60 ℃ before use; the extrusion temperature is adjusted properly (plus or minus 20 ℃) according to the temperature of a machine head being 110-135 ℃ and the machine body being 100-130 ℃ and according to actual conditions, so that the extrusion quality and the appearance are ensured to be smooth and flat, and adverse phenomena such as convex hulls, concave pits, through holes and the like are avoided;
step three, cabling
Adopting a disc type cable former or a (6+12) cable former, stranding 4 wire cores into a cable, wherein the pitch diameter ratio is 35-50, filling inorganic mineral materials in the center and the side edges in the stranding process, and synchronously winding a layer of alkali-free glass fiber tape of 0.2 multiplied by 50 outside the cable core after stranding;
step four, extruding and wrapping the fireproof layer
Extruding and wrapping the alkali-free glass fiber strip with ceramic polyolefin with the thickness of 1-3.5 mm according to the outer diameter of the cable to form an oxygen-insulating fireproof layer, wherein the extruding and wrapping process is the same as that of extruding the insulating protective layer;
step five, wrapping the alkali-free glass fiber tape
An alkali-free glass fiber tape with the thickness of 0.2 multiplied by 50mm is wrapped outside the oxygen-isolating fireproof layer formed by the ceramic polyolefin;
sixthly, extruding and wrapping the outer sheath
And extruding and coating 90 ℃ flame-retardant low-smoke halogen-free sheath material with the average thickness of 1.8-2.0 mm on the outermost layer of the cable.
(III) advantageous effects
The above technical scheme of the utility model has following advantage:
1. the problems of poor bending performance and short fire-resistant time of a traditional mineral insulated cable are solved through product structural design and selection and use of special insulating, oxygen-isolating and fireproof layers and sheath materials, the fire resistance, the insulativity and the bending performance of the cable are improved, the laying difficulty of the cable is reduced, particularly the fire resistance is particularly remarkable, and the structural integrity of the cable for more than 5 hours can be guaranteed and the cable can be continuously electrified at the fire-resistant temperature of 950-1000 ℃. Therefore, the cable can be supplied with power for a long time under the condition of fire, and disaster loss is reduced. Thereby achieving the best and effective combination of the fire resistance and the bending performance of the mineral insulated cable.
2. The cable structure can meet the requirements of integrity tests of fire supply, mechanical impact and water spray lines specified by BS8491, and can ensure the structural integrity of the cable for over 5 hours and continuous energization at the fire-resistant temperature of 950-1000 ℃. The cable has the advantages of convenient field construction and installation, higher flexibility, unlimited cable length and section, and excellent electrical property and mechanical property. The cable has the advantages of light unit weight, no need of special intermediate joint and terminal joint in field construction as common power cables, convenient installation and use and higher flexibility.
3. The minimum bending radius of the ultra-long fire-resistant mineral insulated cable with the structure can reach 10 times of the outer diameter of the cable (15 times of that of a common mineral insulated cable), the fire resistance of the cable meets the requirements of GB/T19216.21-2003, BS6387:2013 and BS8491:2008, and the maximum fire-resistant temperature can reach 1000 ℃. The fire-resistant time is greatly superior to that of a common mineral insulated cable at the flame temperature of 950-1000 ℃, reaches more than 5 hours, and can bear water spray and mechanical vibration without breakdown.
In addition to the technical problems addressed by the present invention, the technical features of the constituent technical solutions, and the advantages brought by the technical features of these technical solutions, further description will be made with reference to the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic cross-sectional view of the cable of the present invention.
In the figure: 1-conductor, 2-insulating layer a, 3-insulating layer b, 4-flame retardant, 51-first glass fiber tape, 52-second glass fiber tape, 6-fireproof layer and 7-outer sheath.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" should be construed broadly and include, for example, fixed connections, detachable connections, or integral connections; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, in the description of the present invention, unless otherwise specified, the terms "plurality", and "plural groups" mean two or more, and the terms "plurality", "several", and "several groups" mean one or more. In the description of the present invention, it should be noted that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like are used, they are only used for convenience of description and simplification of the description, and they do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation and be operated, and thus should not be construed as limiting the present invention. Furthermore, the use of the terms first, second and third are used for descriptive purposes only and are not intended to indicate or imply relative importance.
Example 1
As shown in fig. 1: an ultra-flexible, ultra-long length, fire-resistant, mineral-insulated cable comprising: the cable comprises a wire core, a cable core, a fireproof layer 6 and an outer sheath 7; the cable core is formed by twisting the cable core and filling the flame retardant 4, and the flame retardant 4 comprises alkali-free glass fiber ropes in inorganic mineral substances. The cable core is sequentially wrapped with a fireproof layer 6 and an outer sheath 7; the fireproof layer 6 is made of ceramic polyolefin with the thickness of 1mm, and a first glass fiber belt 51 and a second glass fiber belt 52 are arranged inside and outside the fireproof layer 6 in a closely attached mode. The first glass fiber tape 51 and the second glass fiber tape 52 are alkali-free glass fiber tapes of 0.2 × 50mm, respectively. The outer sheath 7 is made of a 90-DEG C flame-retardant low-smoke halogen-free sheath material, and the average extruded thickness of the outer sheath 7 is 1.8 mm.
The wire core comprises a conductor 1, an insulating layer a2 wrapping the conductor 1 and an insulating layer b3 wrapping the insulating layer a 2. The conductor 1 is a soft copper conductor and is formed by stranding a plurality of strands of soft round copper wires. The insulating layer a2 is wrapped by 4 layers of synthetic mica tapes with the thickness of 0.14 mm. The mica tape comprises 2 layers of 0.14x8mm and 2 layers of 0.14x10mm mica tape, and the 0.14x10mm mica tape is wrapped outside the 0.14x8mm mica tape. The insulating layer b3 was a 0.7mm thick extruded ceramicized polyolefin. Under the condition of 950-1000 ℃ of fire-resistant temperature according to GB/T19216-2003, the utility model discloses cable 320min no-fuse fusing, conductor are continuous, have exceeded 180min standard fire-resistant requirement. And according to BS8491:2008, under the environment of fire supply, mechanical impact and water spraying, the temperature of fire supply is 950-1000 ℃, the utility model discloses the fuse-free fusing of cable, conductor are continuous, and the cable does not puncture. The minimum bending radius of the ultra-long fire-resistant mineral insulated cable with the structure can reach 9.2 times of the outer diameter of the cable.
Example 2
This example differs from example 1 in that: the fire-proof layer 6 between the first glass fiber tape 51 and the second glass fiber tape 52 which are 0.2 x 50mm is extruded by ceramic polyolefin with the thickness of 2 mm; the rest is the same as in example 1. Under the condition that the fire-resistant temperature of the cable is 950-1000 ℃ according to GB/T19216-2003, the cable is fused in 340min without a fuse, and a conductor is continuous, so that the fire-resistant requirement of a 180min standard is exceeded. And according to BS8491:2008, under the environment of fire supply, mechanical impact and water spraying, the temperature of fire supply is 950-1000 ℃, the utility model discloses the fuse-free fusing of cable, conductor are continuous, and the cable does not puncture. The minimum bending radius of the ultra-long fire-resistant mineral insulated cable with the structure can reach 9.5 times of the outer diameter of the cable.
Example 3
This example differs from example 1 or 2 in that: the fire-proof layer 6 between the first glass fiber tape 51 and the second glass fiber tape 52 which are 0.2 x 50mm is extruded by using ceramic polyolefin with the thickness of 3 mm; the others are the same as in example 1 or 2. Under the condition that the fire-resistant temperature of the cable is 950-1000 ℃ according to GB/T19216-2003, the cable is not fused in 360min, and a conductor is not broken, so that the fire-resistant requirement of a 180min standard is exceeded. And according to BS8491:2008, under the environment of fire supply, mechanical impact and water spraying, the temperature of fire supply is 950-1000 ℃, the utility model discloses the fuse-free fusing of cable, conductor are continuous, and the cable does not puncture. The minimum bending radius of the ultra-long fire-resistant mineral insulated cable with the structure can reach 9.5 times to 10 times of the outer diameter of the cable.
Example 4
This example differs from example 2 in that: the insulating layer b3 is extruded ceramic polyolefin with the thickness of 0.8 mm; the rest is the same as in example 2. Under the condition that the fire-resistant temperature of the cable is 950-1000 ℃ according to GB/T19216-2003, the cable is not fused in 362min, and a conductor is not broken, so that the fire-resistant requirement of a 180min standard is exceeded. And according to BS8491:2008, under the environment of fire supply, mechanical impact and water spraying, the temperature of fire supply is 950-1000 ℃, the utility model discloses the fuse-free fusing of cable, conductor are continuous, and the cable does not puncture. The minimum bending radius of the ultra-long fire-resistant mineral insulated cable with the structure can reach 9.5 times to 10 times of the outer diameter of the cable.
Example 5
This example differs from example 4 in that: the insulating layer b3 is extruded ceramic polyolefin with the thickness of 0.9 mm; the rest is the same as in example 4. Under the condition that the fire-resistant temperature of the cable is 950-1000 ℃ according to GB/T19216-2003, the cable is not fused in 362min, and a conductor is not broken, so that the fire-resistant requirement of a 180min standard is exceeded. And according to BS8491:2008, under the environment of fire supply, mechanical impact and water spraying, the temperature of fire supply is 950-1000 ℃, the utility model discloses the fuse-free fusing of cable, conductor are continuous, and the cable does not puncture. The minimum bending radius of the ultra-long fire-resistant mineral insulated cable with the structure can reach 9.5 times to 10 times of the outer diameter of the cable.
Example 6
This example differs from example 4 in that: the outer sheath 7 has an average extruded thickness of 1.9 mm; the rest is the same as in example 4. Under the condition that the fire-resistant temperature of the cable is 950-1000 ℃ according to GB/T19216-2003, the cable is fused in 365min without a fuse, and a conductor is continuous, so that the fire-resistant requirement of a 180min standard is exceeded. And according to BS8491:2008, under the environment of fire supply, mechanical impact and water spraying, the temperature of fire supply is 950-1000 ℃, the utility model discloses the fuse-free fusing of cable, conductor are continuous, and the cable does not puncture. The minimum bending radius of the ultra-long fire-resistant mineral insulated cable with the structure can reach 9.5 times to 10 times of the outer diameter of the cable.
Example 7
This example differs from example 6 in that: the outer sheath 7 has an average extruded thickness of 2.0 mm; the rest is the same as in example 6. Under the condition that the fire-resistant temperature of the cable is 950-1000 ℃ according to GB/T19216-2003, the cable is fused in 365min without a fuse, and a conductor is continuous, so that the fire-resistant requirement of a 180min standard is exceeded. And according to BS8491:2008, under the environment of fire supply, mechanical impact and water spraying, the temperature of fire supply is 950-1000 ℃, the utility model discloses the fuse-free fusing of cable, conductor are continuous, and the cable does not puncture. The minimum bending radius of the ultra-long fire-resistant mineral insulated cable with the structure can reach 10 times of the outer diameter of the cable.
To illustrate examples 1 to 7 of the present invention in more detail, comparative tables of test records are given below: the test is to test the fire resistance of the cable of the utility model under the condition of different combinations of length 1200mm, thickness of the insulating layer b, thickness of the fire-proof layer and thickness of the outer sheath (the fire supply time given in the table is a critical value of no fuse fusing and continuous conductor); test standards (conditions): GB/T19216.11-2003, GB/T19216.21-2003, flame temperature: 950 to 1000 ℃.
TABLE 1 insulating layer b and outer sheath having the same thickness and different fire-retardant layer thickness
| Thickness of insulating layer b | Thickness of fire-proof layer | Thickness of outer sheath | Time of supplying fire | Test results |
| 0.7mm | 1mm | 1.8mm | 320min | No fuse fusing, no break of conductor |
| 0.7mm | 2mm | 1.8mm | 340min | No fuse fusing, no break of conductor |
| 0.7mm | 3mm | 1.8mm | 360min | Fuse-less fuseBreak, conductor break |
| 0.7mm | 3.5 | 1.8mm | 360min | No fuse fusing, no break of conductor |
As can be seen from table 1, when the thickness of the insulating layer b is the same as that of the outer sheath, the structure of the fireproof layer with a thickness of 3mm is better in consideration of obtaining better bending performance and higher cost performance of the cable.
TABLE 2 thickness of the fire protection layer and the outer sheath, and thickness of the insulating layer b
| Thickness of insulating layer b | Thickness of fire-proof layer | Thickness of outer sheath | Time of supplying fire | Test results |
| 0.8mm | 3mm | 1.8mm | 362min | No fuse fusing, no break of conductor |
| 0.9mm | 3mm | 1.8mm | 362min | No fuse fusing, no break of conductor |
As can be seen from table 2, when the thickness of the fire-proof layer is the same as that of the outer sheath, the structure of the insulating layer b with a thickness of 0.8mm is better in consideration of obtaining better bending performance and higher cost performance of the cable.
TABLE 3 insulating layer b thickness and fire-proof layer thickness same, outer sheath thickness different
As can be seen from table 3, the thickness of the insulating layer b is the same as that of the fire-proof layer, and the structure of the outer sheath with the thickness of 1.9mm is better in consideration of obtaining better bending performance and higher cost performance of the cable.
To illustrate in more detail that the cable of the present invention has a better fire resistance than the fire resistant cables of the prior art, the comparison table of the test records is given as follows (the fire supply time given in the table is the critical value of no fuse blowing, the continuity of the conductor, and the value is accurate to ten):
comparison document 1: chinese patent application No. 201711345306.0;
comparison document 2: chinese utility model patent application No. 201820808508.8;
comparison document 3: chinese utility model patent application No. 201720699372.7.
Example 8
The production process of the ultra-flexible and long-time fire-resistant mineral insulated cable disclosed by the embodiment 1-7 comprises the following steps:
step one, preparing a conductor 1
The conductor 1 is formed by twisting a plurality of strands of annealed soft round copper wires, and meets the requirements of GB/T3956-. A frame stranding machine is utilized to regularly twist and mold a plurality of strands of soft copper wires once, and the conductor 1 is stranded while the conductor 1 is compacted, so that the conductor 1 has better roundness and integral performance;
step two, wrapping an insulating layer a2 and extruding an insulating layer b3
Wrapping insulating layer a2
The insulating layer a2 is wrapped by a three-in-one mica tape; insulating layer a2 can be wrapped by adopting the same specification or different specifications, mica tapes with the thickness of 0.14mm and the width of 8-40 mm are wrapped according to the outer diameter of the conductor 1, and the mica tapes with the thickness and the width of from small to large are adopted according to the use principle of the conductor 1. The insulation wrapping adopts a multi-head horizontal wrapping machine, each layer is formed by one-time wrapping in a layering way according to the width from small to large, a positive lapping cover is adopted among the layers, the lapping rate is not less than 15% of the band width, and the joint of the mica tape wrapping layer is firmly bonded by using a transparent adhesive tape;
extruded insulation layer b3
The extruded insulation layer b3 adopts a phi 65+ phi 45 plastic molding machine, a die is in a pipe extrusion type, a screw sleeve is cleaned before starting, the extruded screw is a low-smoke halogen-free screw, the extruded material is a ceramic polyolefin insulation material, and the ceramic polyolefin insulation material is baked and dried in a drying room at 60 ℃ before use, so that the insulation layer a2 is tightly extruded and wrapped, and the insulation layer a2 is easy to strip without being damaged. The extrusion temperature is adjusted properly (plus or minus 20 ℃) according to the temperature of a machine head being 110-135 ℃ and the machine body being 100-130 ℃ and according to actual conditions, so that the extrusion quality and the appearance are ensured to be smooth and flat, and adverse phenomena such as convex hulls, concave pits, through holes and the like are avoided;
step three, cabling
Adopting a disc type cable former or a (6+12) cable former, stranding 4 wire cores into a cable, wherein the pitch ratio is 40 or 45, filling alkali-free glass fiber ropes in inorganic mineral materials at the center and the side edges in the stranding process, and synchronously winding a layer of alkali-free glass fiber belt with the thickness of 0.2 multiplied by 50mm outside the cable core after the cabling and stranding;
step four, extruding and wrapping the fireproof layer 6
Extruding and wrapping the alkali-free glass fiber strip with ceramic polyolefin with the thickness of 3mm according to the size of the outer diameter of the cable to form an oxygen-insulating fireproof layer 6, wherein the extruding and wrapping process is the same as the mode of extruding the insulating layer b 3;
step five, wrapping the alkali-free glass fiber tape
An alkali-free glass fiber tape with the thickness of 0.2 mm multiplied by 50mm is wound outside the oxygen-insulating fire-proof layer 6 formed by ceramic polyolefin;
sixthly, extruding the outer sheath 7
And the outermost layer of the cable is extruded with 90 ℃ flame-retardant low-smoke halogen-free sheathing compound with the average thickness of 1.9 mm.
Because the alkali-free insulating glass fiber is an inorganic insulating material with better high temperature resistance, the glass fiber tapes are wrapped inside and outside the oxygen-insulating fireproof layer 6, and the alkali-free insulating glass fiber has good effect on keeping the shape of the cable under the conditions of heat insulation and fire.
Through with ordinary fire-resistant cable test contrast, according to GB/T19216-2003 fire-resistant temperature 950 ~ 1000 ℃ under the condition, the utility model discloses 360min of cable do not have fuse fusing, the conductor is continuous, has surpassed the fire-resistant requirement of 180min standard. And according to BS8491:2008, under the environment of fire supply, mechanical impact and water spraying, the temperature of fire supply is 950-1000 ℃, the utility model discloses the fuse-free fusing of cable, conductor are continuous, and the cable does not puncture.
While the present invention has been described in detail with reference to the specific embodiments thereof, it is to be understood that the present invention is not limited to the embodiments described above, and that various changes and modifications may be made without departing from the spirit and scope of the present invention.
Claims (9)
1. An ultra-flexible type ultra-long fire-resistant mineral insulated cable comprises a wire core, a cable core, a fireproof layer (6) and an outer sheath (7); the cable core is twisted and filled with flame retardant (4) to form a cable core, and a fireproof layer (6) and an outer sheath (7) are sequentially wrapped outside the cable core; the method is characterized in that: the fireproof layer (6) is made of ceramic polyolefin with the thickness of 1-3.5 mm, and a first glass fiber tape (51) and a second glass fiber tape (52) are arranged inside and outside the fireproof layer (6) in a tightly attached mode.
2. An extra-flexible ultra-long fire-resistant mineral-insulated cable according to claim 1, characterized in that: the cable core comprises a conductor (1), an insulating layer a (2) wrapping the conductor (1) and an insulating layer b (3) wrapping the insulating layer a (2).
3. An extra-flexible ultra-long fire-resistant mineral-insulated cable according to claim 2, characterized in that: the conductor (1) is a soft copper conductor and is formed by stranding a plurality of strands of soft round copper wires.
4. An extra-flexible ultra-long fire-resistant mineral-insulated cable according to claim 2, characterized in that: the insulating layer a (2) is wrapped by 4 layers of synthetic mica tapes with the thickness of 0.14 +/-0.02 mm.
5. An extra-flexible ultra-long fire-resistant mineral-insulated cable according to claim 4, characterized in that: the mica tape comprises 2 layers of 0.14x8mm and 2 layers of 0.14x10mm mica tape, and the 0.14x10mm mica tape is wrapped outside the 0.14x8mm mica tape.
6. An extra-flexible ultra-long fire-resistant mineral-insulated cable according to claim 2, characterized in that: the insulating layer b (3) is extruded ceramic polyolefin with the thickness of 0.7 mm-0.9 mm.
7. An extra-flexible ultra-long fire-resistant mineral-insulated cable according to claim 1, characterized in that: the flame retardant (4) comprises an inorganic mineral.
8. An extra-flexible ultra-long fire-resistant mineral-insulated cable according to claim 1, characterized in that: the first glass fiber tape (51) and the second glass fiber tape (52) are alkali-free glass fiber tapes of 0.2 x 50 mm.
9. An extra-flexible ultra-long fire-resistant mineral-insulated cable according to claim 1, characterized in that: the outer sheath (7) is made of a 90-DEG C flame-retardant low-smoke halogen-free sheath material, and the average extruded thickness of the outer sheath (7) is 1.8-2.0 mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021397902.0U CN212484964U (en) | 2020-07-16 | 2020-07-16 | Super-flexible ultra-long-time fire-resistant mineral insulated cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021397902.0U CN212484964U (en) | 2020-07-16 | 2020-07-16 | Super-flexible ultra-long-time fire-resistant mineral insulated cable |
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| Publication Number | Publication Date |
|---|---|
| CN212484964U true CN212484964U (en) | 2021-02-05 |
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|---|---|---|---|
| CN202021397902.0U Active CN212484964U (en) | 2020-07-16 | 2020-07-16 | Super-flexible ultra-long-time fire-resistant mineral insulated cable |
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| Country | Link |
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| CN (1) | CN212484964U (en) |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: An extra flexible ultra long duration refractory mineral insulated cable Effective date of registration: 20230315 Granted publication date: 20210205 Pledgee: Agricultural Bank of China Limited Kunming Xishan District sub branch Pledgor: Kunming Electric Cable Co., Ltd. of Kunming Cable Group Registration number: Y2023530000009 |
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| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Granted publication date: 20210205 Pledgee: Agricultural Bank of China Limited Kunming Xishan District sub branch Pledgor: Kunming Electric Cable Co., Ltd. of Kunming Cable Group Registration number: Y2023530000009 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A special flexible ultra long duration fire-resistant mineral insulated cable Granted publication date: 20210205 Pledgee: Agricultural Bank of China Limited Kunming Xishan District sub branch Pledgor: Kunming Electric Cable Co., Ltd. of Kunming Cable Group Registration number: Y2024980008481 |