CN218631426U - Ceramic insulation flexible fireproof cable - Google Patents
Ceramic insulation flexible fireproof cable Download PDFInfo
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- CN218631426U CN218631426U CN202222135752.1U CN202222135752U CN218631426U CN 218631426 U CN218631426 U CN 218631426U CN 202222135752 U CN202222135752 U CN 202222135752U CN 218631426 U CN218631426 U CN 218631426U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/14—Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables
Abstract
A ceramic insulated flexible fireproof cable structurally comprises a cable core formed by cable cores; the wire core is formed by wrapping an insulating layer outside a conductor. The insulating layer is formed by extruding ceramic silicon rubber; the cable core is formed by twisting a plurality of wire cores, and a filling material is filled in a central gap; the cable core is sequentially wrapped with a fire-resistant protective layer, a wrapping layer and an outer sheath from inside to outside; the filling material is a ceramic fireproof and fire-resistant filling rope; the fire-resistant protective layer is formed by extruding ceramic silicon rubber, and the fire-resistant protective layer fills the outer gaps of adjacent wire cores in the cable core; the lapping layer is formed by lapping and overlapping ceramic composite tapes; the outer sheath is formed by extruding halogen-free low-smoke flame-retardant polyolefin. This cable has improved the fire-resistant temperature of cable, has prolonged the burning time, compares with flame retarded cable of the same kind, can be more convenient lay the installation.
Description
Technical Field
The utility model belongs to the technical field of the cable, specifically a pottery insulating flexible fireproof cable.
Background
Since the power cable needs to pass through building facilities and densely populated areas, the power cable in these areas is influenced by complex environmental factors, and is more prone to power accidents than other areas, and in order to prevent the power accidents from causing fire disasters or secondary accidents caused by the power cable damaged by fire disasters, the power cable is required to have reliable fireproof function. The cable has the functions of evacuating people, illuminating a passage, a fireproof alarm device, an automatic fire-fighting facility and other emergency equipment when a fire disaster occurs, and the cable is required to be normally electrified within a specified time when the fire disaster occurs, so that the fire-fighting rescue can be carried out, and casualties and economic losses are reduced as much as possible.
The cable is formed by wrapping various functional protective layers outside a conductor, so that the application under the corresponding requirement scene is realized. In addition to metallic conductors or protective layers in cables, protective layers made of other combustible materials have a positive effect on fire protection. For this reason, flame retardant cable materials have been developed for protection of cable conductors. The properties of these cable materials themselves affect the overall mechanical properties of the cable, such as tensile properties, flexibility, etc. Based on available cable materials, how to design a cable structure to enable the cable to meet the fire resistance and the mechanical property and electrical property requirements of the cable is a technical problem to be solved.
Disclosure of Invention
In order to solve the technical problems, the invention provides a ceramic insulated flexible fireproof cable, which structurally comprises a cable core consisting of a wire core; the wire core is formed by wrapping an insulating layer outside a conductor. The insulating layer is formed by extruding ceramic silicon rubber; the thickness of the insulating layer is 1.0-3.0 mm;
the cable core is formed by stranding a plurality of wire cores, a central gap is filled with a filling material, and the pitch-diameter ratio of stranding is not more than 28 times;
the cable core is sequentially wrapped with a fire-resistant protective layer, a wrapping layer and an outer sheath from inside to outside;
in the conductor:
the radial cross-sectional area of the conductor is not more than 6mm 2 Then the conductor is a solid round copper conductor;
the radial cross-sectional area of the conductor is not less than 10mm 2 The conductor is formed by twisting a plurality of bare copper monofilaments, the twist pitch diameter ratio range is 10-20, and the wire diameter of the bare copper monofilaments is 1.36-3.85 mm;
the radial cross-sectional area of the conductor is 6mm 2 ～10mm 2 The conductor is a solid round copper conductor or is formed by twisting a plurality of bare copper monofilaments, the twist pitch diameter ratio range is 10-20 times, and the wire diameter of the bare copper monofilaments is 1.36-3.85 mm;
the filling material is a ceramic fireproof and fireproof filling rope;
the fire-resistant protective layer is formed by extruding ceramic silicon rubber, and the fire-resistant protective layer fills the outer gaps of adjacent wire cores in the cable core; the average thickness of the refractory protective layer is 1.2-1.5 mm
The wrapping layer is formed by overlapping and wrapping ceramic composite tapes;
the outer sheath is formed by extruding halogen-free low-smoke flame-retardant polyolefin, and the thickness of the outer sheath is not less than 1.8mm.
The outer diameter range of the cable is 15 mm-70 mm.
Description of the principles
1. Ceramization principle of ceramization silicon rubber
The ceramic silicon rubber is a novel high-molecular composite fireproof material, the main material is high-temperature silicon rubber (HTV), and the ceramic silicon rubber has the basic characteristics of silicon rubber at normal temperature, is nontoxic, tasteless, resistant to high and low temperatures, resistant to ozone aging, resistant to weather aging, excellent in electrical insulation performance, and good in processing performance of common high-temperature silicon rubber. The ceramic silicon rubber can be rapidly sintered into a hard ceramic shell under the ablation of flame, the surface of the ceramic shell is hard and compact, the ablation of the flame can be effectively resisted, the diffusion of internal combustible gas to the outside can be prevented, and the ceramic silicon rubber has a fire-isolating characteristic; the ceramic shell has the advantages that a plurality of micropores are left in the ceramic shell due to decomposition of the high polymer material, so that the heat insulation effect of the shell is greatly improved, external high temperature can be prevented from being transmitted to the inside, further decomposition of the internal material is delayed, and the ceramic shell has a heat insulation characteristic.
In this cable, the insulating layer has adopted ceramic silicon rubber insulation material, adopts ceramic silicon rubber cable material to further protect the cable core simultaneously, its advantage is: the ceramic silicon rubber has good electrical property and mechanical property, high working temperature and excellent aging resistance, and has the characteristic of softness of the silicon rubber.
The insulating layer and the fire-resistant protective layer of the cable are both of ceramic silicon rubber structures, and can be completely converted into ceramic-shaped shells under the conditions of flame combustion or high temperature, so that the whole cable is changed into a ceramic structure. Meanwhile, due to the fact that the ceramic silicon rubber material is abnormal in softness, compared with a metal sheath or a fireproof cable like fireproof mud in the market, the product has the characteristic of softness.
2. Mechanism of fire prevention
The cause of a fire or being burned by a cable can be generally summarized in two ways. Firstly, the cable body is natural due to the overload or short circuit of the cable; and cable burning caused by external fire source. High molecular compounds composed of C and H elements are under the action of high-temperature flame under the aerobic condition, and the compounds are in an overheated state, release combustible gas and generate smoke and harmful gas. The ceramic insulation flexible fireproof cable adopts ceramic silicon rubber as an insulation layer, and the material has higher overload resistance and can not be decomposed by heating in a flame combustion state but be converted into an inorganic shell; the fire-resistant protective layer, the filling material and the wrapping material are all made of special materials with the property of burning into porcelain, have excellent fire-insulating property and heat-insulating property, can effectively resist flame ablation, prevent external high temperature from being transmitted to the inside of the cable under the fire condition, and simultaneously can not emit smoke and halogen gas.
3. Feasibility and economy of processing
The ceramic high-molecular composite fire-resistant silicon rubber has basically the same processing method as the common high-temperature silicon rubber compound rubber, can be directly extruded and vulcanized into wires and cables by using silicon rubber wire and cable equipment, does not need to increase equipment or huge investment, and can greatly reduce the cost; the electric wire and cable produced by the ceramic high-molecular composite fire-resistant silicon rubber can be laid and installed as conveniently as common electric wires and cables.
Description of the effects
1. The stranded bare copper conductor has improved conductivity.
2. The ceramic silicon rubber is insulating, can not be decomposed by heating in a flame combustion state, but is converted into an inorganic shell, and has excellent flame-retardant, fireproof, waterproof and anti-seismic effects.
3. The fire-resistant protective layer, the filling material and the wrapping material are all made of special materials with the property of burning into porcelain, and have excellent fire-insulating property and heat-insulating property
4. The whole cable has good flame retardant and fire resistant performance, the finished cable meets the fire resistant test standard of GB/T19216.21, the flame temperature is 950 ℃, the rated voltage is applied, and the insulation is not broken down after the duration of 180 min; the fire-resistant test requirements of C (pure fire supply), W (fire supply and water spraying) and Z (fire supply and mechanical vibration) in the BS 6387 standard are met, and the test requirements that the test is carried out according to BS 8491 regulations and the circuit is kept complete are met; and the combustion performance grading system meets the relevant requirements of B1 grade in GB/T31247 cable and optical cable combustion performance grading.
5. Besides the special properties, the ceramic insulated flexible fireproof cable also meets the electrical properties (such as conductor resistance, voltage test, 4h voltage test, insulation resistance test and working capacitance) of the cable, the mechanical properties (such as insulation and sheath mechanical properties, insulation heat extension and the like), the halogen-free (gas evolution test during combustion and fluorine content test) and the non-toxic (insulation and sheath toxicity index) properties.
This cable has improved the refractory temperature of cable, has prolonged the combustion time, compares with magnesium oxide mineral insulation cable BTTZ and mica tape around package ripple copper sheathing cable RTTZ simultaneously, can be more convenient lay installation.
Drawings
Fig. 1 is a schematic view of a radial cross-sectional structure of the cable of this example.
In the figure: 1. a conductor; 2. an insulating layer; 3. ceramic fireproof and fireproof filling ropes; 4. a refractory protective layer; 5. Wrapping a covering layer; 6. an outer sheath.
Detailed Description
The present disclosure is further described with reference to the following drawings and detailed description:
referring to fig. 1, the flexible fireproof cable with ceramic insulation of the present invention has a structure including a cable core made of wire cores; the wire core is formed by wrapping 1 conductor with 2 insulating layers. The insulating layer is formed by extruding ceramic silicon rubber; the thickness of the insulating layer is 1.0-3.0 mm;
the cable core is formed by stranding a plurality of wire cores, a central gap is filled with a filling material, and the pitch-diameter ratio of stranding is not more than 28 times;
the cable core is sequentially wrapped with a fire-resistant protective layer 4, a wrapping layer 5 and an outer sheath 6 from inside to outside;
in the conductor:
the radial cross-sectional area of the conductor is not more than 6mm 2 Then the conductor is a solid round copper conductor;
the radial cross-sectional area of the conductor is not less than 10mm 2 The conductor is formed by twisting a plurality of bare copper monofilaments, the ratio of the twisted pitch diameter ranges from 10 to 20, and the diameter of each bare copper monofilament ranges from 1.36mm to 3.85mm;
the radial cross-sectional area of the conductor is 6mm 2 ～10mm 2 The conductor is a solid round copper conductor or is formed by twisting a plurality of bare copper monofilaments, the ratio of the twisted pitch diameter ranges from 10 to 20 times, and the wire diameter of each bare copper monofilament ranges from 1.36mm to 3.85mm;
the filling material is a ceramic fireproof and fireproof filling rope;
the fire-resistant protective layer is formed by extruding ceramic silicon rubber, and the fire-resistant protective layer fills the outer gaps of adjacent wire cores in the cable core; the average thickness of the refractory protective layer is 1.2-1.5 mm
The wrapping layer is formed by overlapping and wrapping ceramic composite tapes;
the outer sheath is formed by extruding halogen-free low-smoke flame-retardant polyolefin, and the thickness of the outer sheath is not less than 1.8mm.
The outer diameter range of the cable is 15 mm-70 mm.
The cross section area of the single-wire core conductor is 2.5mm 2 The cable is taken as an example:
4 wire cores are arranged; the pitch diameter ratio of the stranded cable core is 25 times.
The cross-sectional area of the conductor is 2.5mm 2 Then, the conductor is 2.5mm 2 A solid round copper conductor.
The filling material is a ceramic fireproof filling rope 3.
The ceramic fireproof filling rope product sold in the market is formed by twisting or stranding ceramic fireproof filling wires. The ceramic fireproof filling yarn is structurally characterized in that a ceramic silicon rubber layer and a halogen-free low-smoke flame-retardant polyolefin layer are wrapped outside a base layer of alkali-free glass fiber yarn.
The ceramic composite tape in the wrapping layer is provided with two layers, the nominal thickness of the two layers is 0.3mm, and the overlapping rate of overlapping wrapping is not less than 25%.
The thickness of the outer sheath is 1.8mm.
In this example:
the type/brand of the ceramicized silicone rubber for the insulating layer and the manufacturers thereof are Liyang insulating materials Co., ltd, TS9710 type.
The type/brand of the ceramicized silicone rubber for the flame-resistant protective layer and the production plants are Liyang insulating Material Co., ltd., TC3710 type.
The halogen-free low-smoke flame-retardant polyolefin sheath material of the outer sheath is a common sheath material type. In this case, a self-produced sheath material of type/brand WH-90 (P201H-FU) (orange) was used.
The cable test results are shown in table 1:
TABLE 1 test results
Claims (6)
1. A ceramic insulation flexible fireproof cable structurally comprises a cable core formed by wire cores; the wire core is formed by wrapping an insulating layer outside a conductor, and is characterized in that the insulating layer is formed by extruding ceramic silicon rubber; the thickness of the insulating layer is 1.0-3.0 mm;
the cable core is formed by stranding a plurality of wire cores, a central gap is filled with a filling material, and the pitch-diameter ratio of stranding is not more than 28 times;
the cable core is sequentially wrapped with a fire-resistant protective layer, a wrapping layer and an outer sheath from inside to outside;
among the conductors:
the radial cross-sectional area of the conductor is not more than 6mm 2 Then the conductor is a solid round copper conductor;
the radial cross-sectional area of the conductor is not less than 10mm 2 The conductor is formed by twisting a plurality of bare copper monofilaments, the ratio of the twisted pitch diameter ranges from 10 to 20, and the diameter of each bare copper monofilament ranges from 1.36mm to 3.85mm;
the radial cross-sectional area of the conductor is 6mm 2 ～10mm 2 The conductor is a solid round copper conductor or is formed by stranding a plurality of bare copper monofilaments, and the stranding pitch-diameter ratio ranges from 10 to 20 timesThe diameter of the bare copper monofilament is 1.36 mm-3.85 mm;
the filling material is a ceramic fireproof and fireproof filling rope;
the fire-resistant protective layer is formed by extruding ceramic silicon rubber, and the fire-resistant protective layer fills the outer gaps of adjacent wire cores in the cable core; the average thickness of the fire-resistant protective layer is 1.2-1.5 mm;
the wrapping layer is formed by overlapping and wrapping ceramic composite tapes;
the outer sheath is formed by extruding halogen-free low-smoke flame-retardant polyolefin, and the thickness of the outer sheath is not less than 1.8mm.
2. The flexible fire-resistant ceramic insulated cable as claimed in claim 1, wherein the cable has an outer diameter ranging from 15mm to 70mm.
3. The ceramicized, insulated, flexible fireproof cable according to claim 1, wherein there are 4 of said cores; the pitch-diameter ratio of the cable core stranding is 25 times.
4. A flexible fire-protected ceramic insulated cable according to claim 3, wherein the cross-sectional area of the conductor is 2.5mm 2 Then, the conductor is 2.5mm 2 A solid round copper conductor.
5. A ceramicized insulated flexible fireproof cable according to claim 3, wherein the ceramicized composite tape in the wrapping layer has two layers, both of which have a nominal thickness of 0.3mm and a overlapping lapping coverage of not less than 25%.
6. A ceramicized, insulated, flexible fire-rated cable according to claim 3 wherein the thickness of the outer sheath is 1.8mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222135752.1U CN218631426U (en) | 2022-08-15 | 2022-08-15 | Ceramic insulation flexible fireproof cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222135752.1U CN218631426U (en) | 2022-08-15 | 2022-08-15 | Ceramic insulation flexible fireproof cable |
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| Publication Number | Publication Date |
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| CN218631426U true CN218631426U (en) | 2023-03-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222135752.1U Active CN218631426U (en) | 2022-08-15 | 2022-08-15 | Ceramic insulation flexible fireproof cable |
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| CN (1) | CN218631426U (en) |
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- 2022-08-15 CN CN202222135752.1U patent/CN218631426U/en active Active
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