NL2025371B1 - Flexible type mineral insulated fireproof cable - Google Patents
Flexible type mineral insulated fireproof cable Download PDFInfo
- Publication number
- NL2025371B1 NL2025371B1 NL2025371A NL2025371A NL2025371B1 NL 2025371 B1 NL2025371 B1 NL 2025371B1 NL 2025371 A NL2025371 A NL 2025371A NL 2025371 A NL2025371 A NL 2025371A NL 2025371 B1 NL2025371 B1 NL 2025371B1
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- layer
- cable
- fireproof
- mineral insulated
- graphene
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
- H01B7/295—Protection against damage caused by extremes of temperature or by flame using material resistant to flame
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
-
- 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
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
- H01B7/26—Reduction of losses in sheaths or armouring
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
- H01B7/282—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B9/00—Power cables
- H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
- H01B9/021—Features relating to screening tape per se
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- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Insulated Conductors (AREA)
Abstract
Disclosed is a flexible type mineral insulated fireproof cable, which belongs to the technical field of cable protection. The flexible type mineral insulated fireproof cable includes four cable cores arranged in an annular array; 3 fireproof mica layer is wrapped outside the cable core; an insulating layer is wrapped outside the fireproof mica layer; an armor layer is sleeved outside the insulating layer; an 1oxygen barrier layer is wrapped outside the four cable cores; and four carbon dioxide filling layers are filled in a cavity between the oxygen barrier layer and the cable core. According to the insulated fireproof cable provided by the present invention, an insulating layer and a fireproof mica layer are wrapped outside a cable core; when the cable is used, a copper core heats, and the fireproof mica layer has good insulation performance and heat resistance; an armor layer is wound on an outer wall of the insulating layer, so that a mechanical strength of the cable can be effectively increased, and an erosion resistance can be improved; and an oxygen barrier layer and an isolation layer that are provided can take effective fireproof and obstruction effect, and effectively control an external fire behavior, thus further protecting the cable.
Description
Flexible type mineral insulated fireproof cable
The present invention relates to the technical field of cables, and in particular to a flexible type mineral insulated fireproof cable.
The wire and cable industry is a second industry next to the automobile industry in China, with a satisfaction rate of product variety and an occupancy rate in domestic market being both greater than 90%. As one of the most important research, development and production bases of cable products throughout the world, China has a series of cable products with a unique performance and a special structure, such as a flame-retardant fireproof cable, a high-low temperature resistant cable, a low-inductance low-noise cable, an environment-friendly cable, a low-smoke halogen-free cable, a termite-rat preventing cable, a waterproof and moisture-proof cable, etc., and has formed a certain productivity. Along with continuous improvement of the society on a safety requirement of safety guarantee and system, and with extensive propaganda, promotion and cooperation of a government, an industry and an enterprise, a special cable product with a high performance, a high efficiency and a safety will be widely applied in all walks of life like western developed countries.
At present, a fireproof cable is extensively applied to such important sectors and public places as a high-rise building, a subway, a power station, a nuclear power station, a hospital and an airport. In case of a fire, the fireproof cable can guarantee smooth operation of communication and power circuits, thus winning precious time for rescue of lives and properties, and making an important contribution to decreasing a personal casualty and a property loss.
In recent years, in fire accidents of a power system throughout the world, a proportion of an interruption of power supply for the power system due to ignition of a power cable tends to rise. Therefore, the fireproof cable is used in such places as the power station and a transformer substation, where a great number of electrical devices are provided and a great number of cables are densely paved, to reduce an occurrence rate of the fire accident of the power system, and to guarantee that an important loop is powered without the interruption. The traditional fireproof cable has a limited fireproof ability. When an external environmental temperature is very high, the cable is still ignited; and once the cable is ignited, the traditional fireproof cable cannot limit the combustion within a local range, resulting in that the fire spreads to burn many power devices and lead to a great economic loss.
Summary 1. Technical problems to be solved
In view of problems in the conventional art, an objective of the present invention is to provide a flexible type mineral insulated fireproof cable. According to the insulated fireproof cable provided by the present invention, an insulating layer and a fireproof mica layer are wrapped outside a cable core; when the cable is used, a copper core heats, and the fireproof mica layer has good insulation performance and heat resistance; an armor layer is wound on an outer wall of the insulating layer, so that a mechanical strength of the cable can be effectively increased, and an erosion resistance can be improved; and an oxygen barrier layer and an isolation layer that are provided can take effective fireproof and obstruction effect, and effectively control an external fire behavior, thus further protecting the cable. 2. Technical solutions
In order to solve the above-mentioned technical problems, the present invention uses the following technical solutions.
A flexible type mineral insulated fireproof cable includes four cable cores arranged in an annular array; a fireproof mica layer is wrapped outside the cable core; an insulating layer is wrapped outside the fireproof mica layer; an armor layer is sleeved outside the insulating layer; an oxygen barrier layer is wrapped outside the four cable cores; four carbon dioxide filling layers are filled in a cavity between the oxygen barrier layer and the cable core; the four carbon dioxide filling layers are disposed by tightly attaching to the four cable cores and various bins; an isolating layer is wrapped outside the oxygen barrier layer; a metal protective layer is wrapped outside the isolating layer; a shielding layer is wrapped outside the metal protective layer; and an outer sheath is wrapped outside the shielding layer. An insulating layer and a fireproof mica layer are wrapped outside a cable core; when the cable is used, a copper core heats, and the fireproof mica layer has good insulation performance and heat resistance, so that a safety accident caused by a reduced insulation performance in long-term use of the cable may be prevented; an armor layer is wound on an outer wall of the insulating layer, so that a mechanical strength of the cable can be effectively increased, an erosion resistance can be improved, and a service life of the cable can further be prolonged; and an oxygen barrier layer and an isolation layer that are provided can take effective fireproof and obstruction effect, and effectively control an external fire behavior, thus further protecting the cable.
Further, the insulating layer is a cross-linked polyethylene insulating layer.
Further, the armor layer is a steel tape spirally wound on the outer wall of the insulating layer.
Further, the carbon dioxide filling layer is a low-ignition-point sealing film filled with titanium dioxide inside. The provided carbon dioxide filling layer is fractured in case of a fire, a large amount of released carbon dioxide can put out the fire effectively, and the fire due to internal ignition of the carbon dioxide filling layer is prevented.
Further, the oxygen barrier layer is prepared from a graphene/polyethylene composite material, and a preparation method of the graphene/polyethylene composite material is as follows: graphene and triethoxyoctylsilane having a mass ratio of 1:5-1:4 are dissolved into an organic solvent, and react at a temperature of 30-35°C to generate triethoxyoctylsilane modified graphene oxide, the triethoxyoctylsilane modified graphene oxide is ultrasonically dispersed into an oleate solvent and reacts for 12-24 h at a temperature of 160-170°C to obtain oleate graphene, then the oleate graphene and polyethylene having a mass ratio of 1:100-1:50 are dispersed and dissolved into a certain amount of xylene solvent, and the obtained oleate graphene and polyethylene solution is mixed in a solution blending manner and then precipitated, dried, and pressed by a mold to obtain the graphene/polyethylene composite material. The oxygen barrier layer is prepared from the graphene/polyethylene composite material, so that oxygen, water and the like can be effectively obstructed; and moreover, the oxygen barrier layer can take an effect of a uniform electric field, can effectively prevent a problem of partial discharge or insulation breakdown, inhibits spatial charge accumulation in a cable insulating material and reduces an electrical conductivity.
Further, the isolating layer is prepared from ceramic silicone rubber, and a raw material of the ceramic silicone rubber includes the following components in parts by weight: 80-90 parts of silicone rubber, 3-7 parts of phenolic resin, 10-15 parts of white carbon black, 4-8 parts of calcium metasilicate, 17-26 parts of mica, 2-4 parts of montmorillonite, 3-8 parts of graphene oxide, 1-4 parts of boron oxide, 1-2 parts of vulcanizing agent, 1-2 parts of silane coupling agent, 3-8 parts of ammonium polyphosphate, 2-6 parts of microencapsulated red phosphorus and 1-2 parts of hydroxyl silicone oil. The oxygen barrier layer 7 is prepared from a fireproof material such as silicone rubber and white carbon black, and the oxygen barrier layer is sintered into a hard ceramic armored housing after several minutes of combustion under the burning of a flame. Such a hard ceramic armored housing may effectively obstruct continuous combustion of the flame and prevent seepage of water, and stops smoke completely within short time of burning, so that the cable has a good flame retardance, meets a fireproof requirement in a spraying condition and prolongs a service life.
Further, the silicon rubber is a mixture of methyl vinyl silicone rubber and methyl phenyl vinyl silicone rubber, and a mass ratio of the methyl vinyl silicone rubber to the methyl phenyl vinyl silicone rubber is 30-50:12-32.
Further, the white carbon black is modified white carbon black, and the modified white carbon black is prepared according to a following process: cyanuric chloride and acetonitrile are uniformly mixed, Pentaerythritol Caged Phosphate (PEPA) and triethylamine are added, a temperature is adjusted to 10-15°C under the protection of nitrogen to react for 200-300 min, then eugenol is added to react for 8-10 h at 40-50°C, and a material A is obtained upon aftertreatment; with a silane coupling agent as a modifier, the white carbon black is modified to obtain a material B; and the material A, the material B, styrene and maleic anhydride are added to toluene, then azodiisobutyronitrile is added, a temperature is heated to 75-80°C under the protection of nitrogen to react for 6-9 h, and upon the completion of reaction, filtration, cleaning and drying are performed to obtain the modified white carbon black.
Further, the metal protective layer is a stainless steel tube; and the stainless steel tube is of a corrugated shape. The metal protective layer serves as an auxiliary fireproof layer, and the stainless steel tube is of the corrugated shape and has a high melting point, so that the cable is not combusted and can further be powered continuously at a fire site, and thus the cost is low.
Further, the shielding layer is a metal shielding layer and specifically uses a copper tape shielding layer or a copper wire net shielding layer. The shielding layer formed by the copper tape shielding layer or the copper wire net shielding layer has a good shielding effect, and effectively improves a shielding performance of the fireproof cable. 3. Beneficial effects
Compared with the conventional art, the present invention has the following advantages. (1) According to the insulated fireproof cable provided by the present invention, an insulating layer and a fireproof mica layer are wrapped outside a cable core; when the cable is used, a copper core heats, and the fireproof mica layer has good insulation performance and heat resistance, so that a safety accident caused by a reduced insulation performance in long-term use of the cable may be prevented; an armor layer is wound on an outer wall of the insulating layer, so that a mechanical strength of the cable can be effectively increased, an erosion resistance can be improved, and a service life of the cable can further be prolonged; and an oxygen barrier layer and an isolation layer that are provided can take effective fireproof and obstruction effect, and effectively control an external fire behavior, thus further protecting the cable. (2) The provided carbon dioxide filling layer is fractured in case of a fire, a large amount of released carbon dioxide can put out the fire effectively, and the fire due to internal ignition of the carbon dioxide filling layer is prevented. (3) The oxygen barrier layer is prepared from a graphene/polyethylene composite material, so that oxygen, water and the like can be effectively obstructed; and moreover, the oxygen barrier layer can take an effect of a uniform electric field, can effectively prevent a problem of partial discharge or insulation breakdown, inhibits spatial charge accumulation in a cable insulating material and reduces an electrical conductivity. (4) An isolating layer is provided in the present invention. The oxygen barrier layer is prepared from a fireproof material such as silicone rubber and white carbon black, and the oxygen barrier layer is sintered into a hard ceramic armored housing after several minutes of combustion under the burning of a flame. Such a hard ceramic armored housing may effectively obstruct continuous combustion of the flame and prevent seepage of water, and stops smoke completely within short time of burning, so that the cable has a good flame retardance, meets a fireproof requirement in a spraying condition and prolongs a service life. (5) A metal protective layer serves as an auxiliary fireproof layer, and a stainless steel tube is of a corrugated shape and has a high melting point, so that the cable is not combusted and can further be powered continuously at a fire site, and thus the cost is low. (6) A shielding layer formed by a copper tape shielding layer or a copper wire net shielding layer has a good shielding effect, and effectively improves a shielding performance of the fireproof cable.
Fig. 1 is a front view of the present invention.
In the figures: 1. cable core, 2. fireproof mica layer, 3. insulating layer, 4. armor layer, 5. carbon dioxide filling layer, 6. oxygen barrier layer, 7. isolating layer, 8. metal protective layer, 9. shielding layer, and 10. outer sheath.
The technical solutions of the embodiments of the present invention are clearly and completely described below in combination with the accompanying drawings in the embodiments of the present invention. It is apparent that the described embodiments are only a part of embodiments of the present invention, instead of all the embodiments. All of the other embodiments, obtained by those of ordinary skill in the art based on the embodiments of the present invention without any inventive efforts, fall into the protection scope of the present invention.
In the description of the embodiments of the present invention, orientation or position relationships indicated by the terms "upper", "lower", "inner", “outer”, "top/bottom end" etc. are based on the orientation or position relationships as shown in the drawings, for ease of the description of the present invention only, rather than indicating that the indicated device or element have a particular orientation and must be constructed and operated in the particular orientation.
Therefore, these terms should not be understood as a limitation to the present invention. In addition, the terms “first” and “second” are used for descriptive purposes only and cannot be construed as indicating or implying a relative importance.
In the description of the present invention, it should be noted that, unless otherwise clearly stated and limited, the terms “mounted”, “provided with”, “sleeve” , and “connected” should be understood broadly, for instance, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection, and can also be an electrical connection; it can be a direct connection, can also be an indirect connection by an intermediary, and can be an internal communication of two elements. Those of ordinary skill in the art may understand concrete meanings of the terms in the present invention as per specific circumstances.
Embodiment 1
Referring to Fig. 1, a flexible type mineral insulated fireproof cable includes four cable cores 1 arranged in an annular array; a fireproof mica layer 2 is wrapped outside the cable core 1; an insulating layer 3 is wrapped outside the fireproof mica layer 2; an armor layer 4 is sleeved outside the insulating layer; an oxygen barrier layer 6 is wrapped outside the four cable cores 1; four carbon dioxide filling layer 5 is filled in a cavity between the oxygen barrier layer 6 and the cable core 1; the four carbon dioxide filling layers 5 are disposed by tightly attaching to the four cable cores 1 and various bins 6; an isolating layer 7 is wrapped outside the oxygen barrier layer 6; a metal protective layer 8 is wrapped outside the isolating layer 7; a shielding layer 9 is wrapped outside the metal protective layer 8; and an outer sheath 10 is wrapped outside the shielding layer 9.
According to the insulated fireproof cable provided by the present invention, an insulating layer 3 and a fireproof mica layer 2 are wrapped outside a cable core; when the cable is used, a copper core heats, and the fireproof mica layer 3 has good insulation performance and heat resistance, so that a safety accident caused by a reduced insulation performance in long-term use of the cable may be prevented; an armor layer 4 is wound on an outer wall of the insulating layer, so that a mechanical strength of the cable can be effectively increased, an erosion resistance can be improved, and a service life of the cable can further be prolonged; and an oxygen barrier layer 6 and an isolation layer 7 that are provided can take effective fireproof and obstruction effect, and effectively control an external fire behavior, thus further protecting the cable.
The insulating layer 3 is a cross-linked polyethylene insulating layer.
The armor layer 4 is a steel tape spirally wound on the outer wall of the insulating layer 3.
The carbon dioxide filling layer 5 is a low-ignition-point sealing film filled with titanium dioxide inside. The provided carbon dioxide filling layer 5 is fractured in case of a fire, a large amount of released carbon dioxide can put out the fire effectively, and the fire due to internal ignition of the carbon dioxide filling layer is prevented.
The oxygen barrier layer 6 is prepared from a graphene/polyethylene composite material, and a preparation method of the graphene/polyethylene composite material is as follows: graphene and triethoxyoctylsilane having a mass ratio of 1:5-1:4 are dissolved into an organic solvent, and react at a temperature of 30-35°C to generate triethoxyoctylsilane modified graphene oxide, the triethoxyoctylsilane modified graphene oxide is ultrasonically dispersed into an oleate solvent and reacts for 12-24 h at a temperature of 160-170°C to obtain oleate graphene, then the oleate graphene and polyethylene having a mass ratio of 1:100-1:50 are dispersed and dissolved into a certain amount of xylene solvent, and the obtained oleate graphene and polyethylene solution is mixed in a solution blending manner and then precipitated, dried, and pressed by a mold to obtain the graphene/polyethylene composite material.
The oxygen barrier layer 6 is prepared from a graphene/polyethylene composite material, so that oxygen, water and the like can be effectively obstructed; and moreover, the oxygen barrier layer can take an effect of a uniform electric field, can effectively prevent a problem of partial discharge or insulation breakdown, inhibits spatial charge accumulation in a cable insulating material and reduces an electrical conductivity.
The isolating layer 7 is prepared from ceramic silicone rubber, and a raw material of the ceramic silicone rubber includes the following components in parts by weight: 80-90 parts of silicone rubber, 3-7 parts of phenolic resin, 10-15 parts of white carbon black, 4-8 parts of calcium metasilicate, 17-26 parts of mica, 2-4 parts of montmorillonite, 3-8 parts of graphene oxide, 1-4 parts of boron oxide, 1-2 parts of vulcanizing agent, 1-2 parts of silane coupling agent, 3-8 parts of ammonium polyphosphate, 2-6 parts of microencapsulated red phosphorus and 1-2 parts of hydroxyl silicone oil.
An isolating layer 7 is provided in the present invention. The oxygen barrier layer 7 is prepared from a fireproof material such as silicone rubber and white carbon black, and the oxygen barrier layer is sintered into a hard ceramic armored housing after several minutes of combustion under the burning of a flame. Such a hard ceramic armored housing may effectively obstruct continuous combustion of the flame and prevent seepage of water, and stops smoke completely within short time of burning, so that the cable has a good flame retardance, meets a fireproof requirement in a spraying condition and prolongs a service life.
The silicon rubber is a mixture of methyl vinyl silicone rubber and methyl phenyl vinyl silicone rubber, and a mass ratio of the methyl vinyl silicone rubber to the methyl phenyl vinyl silicone rubber is 30-50:12-32.
The white carbon black is modified white carbon black, and the modified white carbon black is prepared according to a following process: cyanuric chloride and acetonitrile are uniformly mixed, PEPA and triethylamine are added, a temperature is adjusted to 10-15°C under the protection of nitrogen to react for 200-300 min, then eugenol is added to react for 8-10 h at 40-50°C, and a material A is obtained upon aftertreatment; with a silane coupling agent as a modifier, the white carbon black is modified to obtain a material B; and the material A, the material B, styrene and maleic anhydride are added to toluene, then azodiisobutyronitrile is added, a temperature is heated to 75-80°C under the protection of nitrogen to react for 6-9 h, and upon the completion of reaction, filtration, cleaning and drying are performed to obtain the modified white carbon black.
The metal protective layer 8 is a stainless steel tube; and the stainless steel tube is of a corrugated shape. The metal protective layer 8 serves as an auxiliary fireproof layer, and the stainless steel tube is of the corrugated shape and has a high melting point, so that the cable is not combusted and can further be powered continuously at a fire site, and thus the cost is low.
The shielding layer 9 is a metal shielding layer and specifically uses a copper tape shielding layer or a copper wire net shielding layer. The shielding layer formed by the copper tape shielding layer or the copper wire net shielding layer has a good shielding effect, and effectively improves a shielding performance of the fireproof cable.
The above are merely preferred and specific implementation manners of the present invention. The protection scope of the present invention is not limited thereto. Any equivalent replacement or change made by those of skill in the art according to the technical solutions and improved concepts of the present invention within a disclosed technical scope of the present invention should be included in the protection scope of the present invention.
Claims (10)
Applications Claiming Priority (1)
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CN202010103210.9A CN111415776A (en) | 2020-02-20 | 2020-02-20 | Soft mineral insulation fireproof cable |
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NL2025371A NL2025371A (en) | 2021-09-16 |
NL2025371B1 true NL2025371B1 (en) | 2023-05-03 |
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NL2025371A NL2025371B1 (en) | 2020-02-20 | 2020-04-20 | Flexible type mineral insulated fireproof cable |
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NL (1) | NL2025371B1 (en) |
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CN112366033B (en) * | 2020-11-11 | 2023-02-28 | 湖南华菱线缆股份有限公司 | Filling for light high-pressure gas flame-retardant cable |
CN114093562B (en) * | 2021-10-29 | 2023-12-08 | 江苏帝诚线缆有限公司 | Fire monitoring is with fire-retardant fireproof cable |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS5669718A (en) * | 1979-11-12 | 1981-06-11 | Hitachi Cable | Fillerrfilled crosslinking polyethylene insulating cable |
ITMI20121178A1 (en) * | 2012-07-05 | 2014-01-06 | Prysmian Spa | ELECTRIC CABLE RESISTANT TO FIRE, WATER AND MECHANICAL STRESS |
CN203644445U (en) * | 2013-12-23 | 2014-06-11 | 河南金水电缆集团有限公司 | Flame-retardant composite fireproof cable |
MX2017004949A (en) * | 2014-10-17 | 2017-07-05 | 3M Innovative Properties Co | Dielectric material with enhanced breakdown strength. |
CN105989914B (en) * | 2015-02-05 | 2018-10-30 | 上海朗达电缆(集团)有限公司 | A kind of environment-friendly type flexible fire-proof cable |
CN107316691A (en) * | 2017-08-03 | 2017-11-03 | 张敬敏 | A kind of radiation proof flame-retardant composite fireproof cable |
CN207149297U (en) * | 2017-09-13 | 2018-03-27 | 福建鼎力电缆科技有限公司 | A kind of environment-friendly fireproof cable |
CN107919185A (en) * | 2017-11-27 | 2018-04-17 | 安徽上缆防火科技股份有限公司 | A kind of isolated form flexible mineral insulation cable |
CN208284251U (en) * | 2018-05-02 | 2018-12-25 | 广州市广惠通线缆有限公司 | A kind of environment-friendly type refractory cable for digital communication |
CN209133252U (en) * | 2019-01-04 | 2019-07-19 | 常州超越特种电缆有限公司 | A kind of communication cable with stretch-proof function |
CN209543996U (en) * | 2019-04-22 | 2019-10-25 | 四川省万阳电缆有限公司 | Electrician's grade aluminium alloy conductor energy-saving fire proof cable |
CN110534248B (en) * | 2019-07-29 | 2020-10-27 | 安徽电缆股份有限公司 | Nuclear island fireproof cable |
-
2020
- 2020-02-20 CN CN202010103210.9A patent/CN111415776A/en active Pending
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NL2025371A (en) | 2021-09-16 |
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