CN110767357A - Metal sleeve flexible mineral substance insulation oxygen-isolation layer fireproof cable for fire-fighting line - Google Patents
Metal sleeve flexible mineral substance insulation oxygen-isolation layer fireproof cable for fire-fighting line Download PDFInfo
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- CN110767357A CN110767357A CN201910964091.3A CN201910964091A CN110767357A CN 110767357 A CN110767357 A CN 110767357A CN 201910964091 A CN201910964091 A CN 201910964091A CN 110767357 A CN110767357 A CN 110767357A
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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
- H01B7/42—Insulated conductors or cables characterised by their form with arrangements for heat dissipation or conduction
- H01B7/428—Heat conduction
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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
- H01B7/04—Flexible cables, conductors, or cords, e.g. trailing cables
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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
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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
- H01B7/292—Protection against damage caused by extremes of temperature or by flame using material resistant to heat
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Abstract
A metal sleeve flexible mineral substance insulation oxygen-isolation layer fireproof cable for a fire-fighting line comprises a fixed net, wherein a plurality of conductor structures are arranged in the fixed net; the conductor structure comprises a plurality of conductors and mineral insulating layers wrapping the outer surfaces of the plurality of conductors, and metal sleeves wrap the outer surfaces of the mineral insulating layers; filling mica powder between the conductor structure and the fixing net; and a fireproof layer is arranged on the outer surface of the fixing net. The invention has the advantages that the rated voltage level of the fireproof cable can be increased from 450/750V to 0.6/1kV, the cable is not broken down at 950-1000 ℃/3h, and the fire time is as follows: 80min, heating to 850 deg.C or above; the flame-retardant height: less than 0.5 m; self-extinguishing time: 5 seconds; the light transmittance is more than or equal to 70 percent.
Description
Technical Field
The invention relates to a fireproof cable, in particular to a fireproof cable with a metal sleeve and a flexible mineral substance insulation oxygen-isolation layer for a fire line.
Background
Mineral Insulated Cable (MI Cable) is called Mineral Cable or Mineral fireproof Cable in domestic practice when used as wiring. The mineral insulation type non-combustible cable consists of a copper core, a mineral insulation material, copper and other metal sheaths. The cable has good conductivity, mechanical and physical properties, fire resistance and non-flammability, and can ensure fire protection and power supply within the duration of a fire under the condition of the fire, and cannot delay combustion and generate toxic smoke.
In 1896 MI cables originated in swiss, were transmitted to france in 1934, and began to be developed in england in 1936. It is widely used due to its excellent fire-resistant properties, including the domestic standard BS6387 for the detection of various mineral cables, also the british standard used. Until now, the rigid cable BTTZ is adopted, and after the MI cable is introduced into China, because of the higher production cost limit, the number of initial production enterprises and users is small, and the MI cable is not required to be used by a fire-fighting line in a mandatory way until GB/T50016 is implemented in 2015, so that the MI cable is in spring to the beginning in China.
Rigid mineral insulation has certain disadvantages in terms of performance, production, and lay-up due to its natural inadequacy in structural design. The rise of flexible mineral insulated fireproof cables in developed countries, particularly in european union countries, is replacing the use of rigid mineral insulated cables. The metal sleeve flexible mineral substance insulation oxygen-isolation layer fireproof cable for the fire line developed by the company only has the enterprise standards formulated by the company, and has no national standard.
Disclosure of Invention
The invention provides a metal sleeve flexible mineral insulation oxygen-insulating layer fireproof cable for a fire-fighting line, which can enable the rated voltage level of the fireproof cable to be increased from 450/750V to 0.6/1kV, does not break down at 950-1000 ℃/3h, and has the following fire-receiving time: 80min, heating to 850 deg.C or above; the flame-retardant height: less than 0.5 m; self-extinguishing time: 5 seconds; the light transmittance is more than or equal to 70 percent.
The technical scheme for realizing the aim of the invention is that the metal sleeve flexible mineral substance insulation oxygen-isolation layer fireproof cable for the fire line comprises a fixed net, wherein a plurality of conductor structures are arranged in the fixed net;
the conductor structure comprises a plurality of conductors and mineral insulating layers wrapping the outer surfaces of the plurality of conductors, and metal sleeves wrap the outer surfaces of the mineral insulating layers;
filling mica powder between the conductor structure and the fixing net;
and a fireproof layer is arranged on the outer surface of the fixing net.
The fireproof cable further comprises a central heat conducting wire arranged at the center, the fixed net sleeve is arranged on the central heat conducting wire, and the plurality of conductor structures are arranged between the central heat conducting wire and the fixed net sleeve.
Further, the inner surface of the metal sleeve is coated with aluminum hydroxide powder and/or magnesium hydroxide powder.
Further, a ceramic fireproof silicon rubber belt is wrapped on the surface of the metal sleeve.
Further, the fireproof layer is a mica tape.
Furthermore, the fixing net is made of high-temperature-resistant metal materials.
Further, the fixing net is connected with the central heat conducting wire through a heat conducting fine wire.
The cable has the advantages that 1, the fireproof performance is good, the fireproof layer has good heat conducting performance under the normal use condition of the cable, the use condition of the cable can be improved, and the normal use of the cable can be ensured. When the cable is attacked by flame, the fire-resistant layer rapidly expands to form a heat-insulating barrier layer with good effect, and the cable core is protected from being attacked by external fire sources. The cable does not break down in 180 minutes under the flame condition of 750-800 ℃. 2. The flame retardant performance is that the cable carbonization height is less than 1.5m (national standard 2.5 m), the self-extinguishing time is less than 10s (national standard 3600 s) and the combustion performance index exceeds the requirement of the national A standard under the combustion state that the non-metal content reaches more than 14L/m (2 times of the national A standard). The minimum light transmittance is more than 70 percent. 3. The unique metal mesh framework fire-resistant layer structure (fixed mesh) not only enables the fire-resistant layer to have an expanded gap under flame, but also enables the expanded fire-resistant layer to have a grid climbing, ensures the integrity of a cable core under the condition of flame, and plays a key role. 4. The product has repairability, and a common fire-resistant cable only has certain capacity of keeping the circuit electrified under the condition of fire, and the cable is completely scrapped after the fire, so that the loss is large. The product has the normal capacity of keeping the circuit electrified under the condition of fire, the cable can be continuously used after being repaired after the fire, and the loss is obviously reduced.
5. Under extreme condition, the effect of separation high temperature can be effectively improved in the constantly whereabouts from the fixed network of mica powder, generally as long as the mica powder does not drop or only drops within ten percent from the fixed network, and this cable wraps up no halogen low smoke sheath again and can recycle, also can reach the cable under 750 ~ 800 ℃ of flame condition through the detection, and 160 minutes do not puncture, reach the national requirement.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
Fig. 2 is a first preferred structure diagram of the present invention.
Fig. 3 is a schematic diagram of a second preferred structure of the present invention.
Fig. 4 is a schematic diagram of a third preferred structure of the present invention.
As shown in the figure, the fixing net 1, the conductor structure 2, the conductor 21, the mineral insulating layer 22, the metal sleeve 23, the mica powder 3, the fireproof layer 4, the halogen-free low-smoke sheath 5, the central heat conducting wire 6, the heat conducting fine wire 7 and the ceramic fireproof silicon rubber belt 8.
Detailed Description
As shown in fig. 1, the fire-protection cable with the metal sleeve and the flexible mineral insulation oxygen-isolation layer for the fire-protection line comprises a fixed net 1, wherein four conductor structures 2 are arranged in the fixed net 1, preferably, the fixed net 1 is made of a high-temperature-resistant metal material, and the high-temperature-resistant metal material is preferably a 10-20-mesh copper wire mesh made of copper;
the conductor structure 2 comprises a plurality of conductors 21 and a mineral insulating layer 22 wrapping the outer surfaces of the conductors 21, and a metal sleeve 23 is wrapped on the outer surface of the mineral insulating layer 22;
filling mica powder 3 between the conductor structure 2 and the fixing net 1;
the outer surface of the fixing net 1 is provided with a fireproof layer 4, the fireproof layer 4 is also provided with a halogen-free low-smoke sheath 5, preferably, the fireproof layer 4 is a mica tape, and the weight of the mica tape is 1.2-1.45 g/cm 3.
The working principle is as follows: when meeting fire, the halogen-free low-smoke sheath 5 primarily protects the cable, the halogen-free low-smoke sheath 5 loses the function of combustion, the fireproof layer 4 secondarily isolates heat energy and flame, the fixing net 1 absorbs heat to expand after the fireproof layer 4 is heated to a certain degree, so that the fireproof layer 4 consisting of mica tapes also expands, the mica powder 3 slightly expands when being heated to form a heat insulation barrier layer with good effect, the cable core is protected from being invaded by external fire sources, when the heat is accumulated to a certain amount, the mica powder 3 and the fixing net 1 expand to exceed a certain amount, the mica tapes (the fireproof layer 4) are broken and fall off from the fixing net 1, the combustion part on the surface of the cable is separated from the fixing net 1 in the falling process, the influence of the heat on the cable core is prevented, after glue contained in the mica powder 3 is evaporated at high temperature, the mica powder 3 is fully dried, and the particles of the mica powder 3 fall from the meshes of the fixing net 1, high-temperature substances on the surface of the cable are taken away, and the ignition point can be covered under the real ignition condition. Under the condition that fire gas is sprayed to the cable from the upper part and the side part simultaneously, after six times of repeated tests, the cable is not broken down in 182 minutes at the lowest and 187 minutes at the flame condition of 750-800 ℃.
As shown in fig. 2, the metal-sheathed flexible mineral-insulated oxygen-barrier fireproof cable for the fire line comprises a fixed net 1 and a central heat-conducting wire 6 arranged in the center, wherein four conductor structures 2 are arranged in the fixed net 1, preferably, the fixed net 1 is made of a high-temperature-resistant metal material, preferably, copper, and a 20-40-mesh copper wire mesh is made of steel;
the conductor structure 2 comprises a plurality of conductors 21 and a mineral insulating layer 22 wrapping the outer surfaces of the conductors 21, and a metal sleeve 23 is wrapped on the outer surface of the mineral insulating layer 22;
the fixed net 1 is sleeved on the central heat conducting wire 6, and the four conductor structures 2 are arranged between the central heat conducting wire 6 and the fixed net 1;
filling mica powder 3 between the conductor structure 2 and the fixing net 1;
the outer surface of the fixing net 1 is provided with a fireproof layer 4, the fireproof layer 4 is also provided with a halogen-free low-smoke sheath 5, preferably, the fireproof layer 4 is a mica tape, and the weight of the mica tape is 1.2-1.45 g/cm 3.
The working principle is that when fire occurs, the halogen-free low-smoke sheath 5 primarily protects the cable, the halogen-free low-smoke sheath 5 loses the function of combustion, the fireproof layer 4 secondarily isolates heat energy and flame, the fixing net 1 absorbs heat to expand after the fireproof layer 4 is heated to a certain degree, so that the fireproof layer 4 consisting of mica tapes also expands, the mica powder 3 slightly expands when being heated to form a heat insulation barrier layer with good effect, a cable core is protected from being invaded by an external fire source, when the heat is accumulated to a certain amount, the mica powder 3 and the fixing net 1 expand to exceed a certain amount, the mica tapes (the fireproof layer 4) are broken and fall off from the fixing net 1, a combustion part on the surface of the cable is separated from the fixing net 1 in the falling process, meanwhile, the central heat conducting wire 6 conducts the heat energy of the mica powder 3, so that the central temperature of the heated part is in a relatively low position, the influence to the cable core after preventing the heat accumulation too much, after the glue that mica powder 3 contains is evaporated by high temperature, mica powder 3 is by the abundant stoving back, and 3 granules of mica powder fall from the mesh of fixed net 1, take away the high temperature material on cable surface, under real condition of catching fire, can cover the ignition. Through six tests, the cable is not broken down in 192 minutes at the lowest and 210 minutes at the longest under the condition of flame at 750-800 ℃ under the condition that fire gas is sprayed to the cable from the upper part and the side part simultaneously.
As shown in fig. 3, the metal-sheathed flexible mineral-insulated oxygen-barrier fireproof cable for the fire line comprises a fixed net 1 and a central heat-conducting wire 6 arranged in the center, wherein four conductor structures 2 are arranged in the fixed net 1, preferably, the fixed net 1 is made of a high-temperature-resistant metal material, and preferably, the high-temperature-resistant metal material is copper;
the conductor structure 2 comprises a plurality of conductors 21 and a mineral insulating layer 22 wrapping the outer surfaces of the conductors 21, and a metal sleeve 23 is wrapped on the outer surface of the mineral insulating layer 22;
the fixed net 1 is sleeved on the central heat conducting wire 6, the four conductor structures 2 are arranged between the central heat conducting wire 6 and the fixed net sleeve 1, and the fixed net 1 is connected with the central heat conducting wire 6 through a heat conducting fine wire 7;
filling mica powder 3 between the conductor structure 2 and the fixing net 1;
the outer surface of the fixing net 1 is provided with a fireproof layer 4, the fireproof layer 4 is also provided with a halogen-free low-smoke sheath 5, preferably, the fireproof layer 4 is a mica tape, and the weight of the mica tape is 1.2-1.45 g/cm 3.
The working principle is as follows: when meeting fire, the halogen-free low-smoke sheath 5 primarily protects the cable, the halogen-free low-smoke sheath 5 loses the function of combustion, the fireproof layer 4 secondarily isolates heat energy and flame, the fixing net 1 absorbs heat to expand after the fireproof layer 4 is heated to a certain degree, so that the fireproof layer 4 consisting of mica tapes also expands, the mica powder 3 slightly expands when being heated to form a heat insulation barrier layer with good effect, the cable core is protected from being invaded by external fire sources, when the heat is accumulated to a certain amount, the mica powder 3 and the fixing net 1 expand to exceed a certain amount, the mica tapes (the fireproof layer 4) are broken and fall off from the fixing net 1, the combustion part on the surface of the cable is separated from the fixing net 1 in the falling process, meanwhile, the central heat conducting wire 6 conducts the heat energy of the mica powder 3, the central temperature of the heated part is in a relatively low position, and the influence on the cable core after the heat is accumulated excessively is prevented, the heat conduction fine line 7 enables the heat efficiency of the fixed net 1 conducted to the central heat conduction line 6 to be greatly improved, the longer the central heat conduction line 6 is, the lower the central temperature of combustion is, after glue contained in the mica powder 3 is evaporated at high temperature, the mica powder 3 is fully dried, particles of the mica powder 3 fall from meshes of the fixed net 1, high-temperature substances on the surface of the cable are taken away, and the ignition point can be covered under the real ignition condition. After six tests, the cable is not broken down in 195 minutes at the lowest and 213 minutes at the longest under the condition of flame at 780-800 ℃.
As shown in fig. 4, the metal-sheathed flexible mineral-insulated oxygen-barrier fireproof cable for the fire line comprises a fixed net 1 and a central heat-conducting wire 6 arranged in the center, wherein four conductor structures 2 are arranged in the fixed net 1, preferably, the fixed net 1 is made of a high-temperature-resistant metal material, and preferably, the high-temperature-resistant metal material is aluminum;
the conductor structure 2 comprises a plurality of conductors 21 and a mineral insulating layer 22 wrapping the outer surfaces of the plurality of conductors 21, wherein a metal sleeve 23 is wrapped on the outer surface of the mineral insulating layer 22, and preferably, aluminum hydroxide powder and/or magnesium hydroxide powder is coated on the inner surface of the metal sleeve 23;
the fixed net 1 is sleeved on the central heat conducting wire 6, the four conductor structures 2 are arranged between the central heat conducting wire 6 and the fixed net sleeve 1, and the fixed net 1 is connected with the central heat conducting wire 6 through a heat conducting fine wire 7;
filling mica powder 3 between the conductor structure 2 and the fixing net 1;
the outer surface of the fixing net 1 is provided with a fireproof layer 4, the fireproof layer 4 is also provided with a halogen-free low-smoke sheath 5, preferably, the fireproof layer 4 is a mica tape, and the weight of the mica tape is 1.2-1.45 g/cm 3.
Preferably, the surface of the metal sleeve 23 is wrapped with a ceramic fire-resistant silicon rubber strip 8, the fire-resistant silicon rubber strip 8 is formed by mixing aluminum hydroxide (46-49% by weight), magnesium hydroxide (46-49% by weight) and glue (2-8% by weight), the thickness of the fire-resistant silicon rubber strip is 0.3-0.5 cm, and the fire-resistant silicon rubber strip is decomposed into water and carbon dioxide during combustion to prevent combustion.
The working principle is as follows: when meeting fire, the halogen-free low-smoke sheath 5 primarily protects the cable, the halogen-free low-smoke sheath 5 loses the function of combustion, the fireproof layer 4 secondarily isolates heat energy and flame, the fixing net 1 absorbs heat to expand after the fireproof layer 4 is heated to a certain degree, so that the fireproof layer 4 consisting of mica tapes also expands, the mica powder 3 slightly expands when being heated to form a heat insulation barrier layer with good effect, a cable core is protected from being invaded by an external fire source, when the heat is accumulated to a certain amount, the mica powder 3 (containing 1-2% of glue by weight) and the fixing net 1 expands to exceed a certain amount, the mica tapes (the fireproof layer 4) are broken and fall off from the fixing net 1, the combustion part on the surface of the cable is separated from the fixing net 1 in the falling process, meanwhile, the heat energy of the mica powder 3 is conducted by the central heat conducting wire 6, so that the central temperature of the heated part is in a relatively low position, prevent the influence to the cable core after the heat accumulation is too much, heat conduction fine rule 7 makes fixed network 1 improve by a wide margin to the heat efficiency of center heat conduction line 6 conduction, make center heat conduction line 6 length longer, the central temperature of its burning just lower, after glue that mica powder 3 contains is evaporated by the high temperature, mica powder 3 is by the abundant back of drying, 3 granule whereabouts of mica powder follow fixed network 1's mesh, take away the high temperature material on cable surface, under real condition of catching fire, can cover the ignition. Under the condition that fire gas is sprayed to the cable from the upper part and the side part simultaneously, after six times of repeated tests, the cable is not broken down in 203 minutes at the lowest and 218 minutes at the longest under the flame condition of 780-800 ℃.
One of the core points of the invention is that the fixing net 1 is filled with mica powder, when high temperature is encountered, the fixing net can protect the conducting wire as long as glue in the mica powder is not evaporated, and after the glue in the mica powder is dehydrated and evaporated, mica powder particles gradually fall off from the fixing net, so that part of heat on the surface of the cable can be taken away, and the heat is prevented from being concentrated on the surface of the cable and conducted to the inside of the cable to damage the inside of the cable.
Claims (7)
1. The utility model provides a flexible mineral substance of metal covering insulation separates oxygen layer fireproof cable for fire circuit, characterized by: the fireproof cable comprises a fixed net, wherein a plurality of conductor structures are arranged in the fixed net;
the conductor structure comprises a plurality of conductors and mineral insulating layers wrapping the outer surfaces of the plurality of conductors, and metal sleeves wrap the outer surfaces of the mineral insulating layers;
filling mica powder between the conductor structure and the fixing net;
and a fireproof layer is arranged on the outer surface of the fixing net.
2. The fire-fighting cable with metal sheath and flexible mineral insulation oxygen-isolating layer as claimed in claim 1, which is characterized in that: the fireproof cable further comprises a central heat conducting line arranged at the center, the fixed net sleeve is arranged on the central heat conducting line, and the plurality of conductor structures are arranged between the central heat conducting line and the fixed net sleeve.
3. The fire-fighting cable with metal sheath and flexible mineral insulation oxygen-isolating layer as claimed in claim 1, which is characterized in that: and aluminum hydroxide powder and/or magnesium hydroxide powder is coated on the inner surface of the metal sleeve.
4. The fire-fighting cable with metal sheath and flexible mineral insulation oxygen-isolating layer as claimed in claim 1, which is characterized in that: and a ceramic fireproof silicon rubber belt is wrapped on the surface of the metal sleeve.
5. The fire-fighting cable with metal sheath and flexible mineral insulation oxygen-isolating layer as claimed in claim 1, which is characterized in that: the fireproof layer is a mica tape.
6. The fire-fighting cable with metal sheath and flexible mineral insulation oxygen-isolating layer as claimed in claim 1, which is characterized in that: the fixing net is made of high-temperature resistant metal material.
7. The fire-fighting cable with metal sheath and flexible mineral insulation oxygen-isolating layer as claimed in claim 2, which is characterized in that: the fixing net is connected with the central heat conducting wire through a heat conducting fine wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910964091.3A CN110767357A (en) | 2019-10-11 | 2019-10-11 | Metal sleeve flexible mineral substance insulation oxygen-isolation layer fireproof cable for fire-fighting line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910964091.3A CN110767357A (en) | 2019-10-11 | 2019-10-11 | Metal sleeve flexible mineral substance insulation oxygen-isolation layer fireproof cable for fire-fighting line |
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| CN110767357A true CN110767357A (en) | 2020-02-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910964091.3A Pending CN110767357A (en) | 2019-10-11 | 2019-10-11 | Metal sleeve flexible mineral substance insulation oxygen-isolation layer fireproof cable for fire-fighting line |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11111074A (en) * | 1997-10-03 | 1999-04-23 | Yazaki Corp | Fire resistant electric wire |
| CN106298020A (en) * | 2016-10-14 | 2017-01-04 | 飞洲集团有限公司 | A kind of fire-resisting cable |
| CN207489561U (en) * | 2017-12-14 | 2018-06-12 | 昆明欧杰电缆制造有限公司 | Clean type low smoke and zero halogen flexible mineral matter insulated cable |
| CN208753032U (en) * | 2018-08-15 | 2019-04-16 | 苏州闪联高压电器有限公司 | A kind of low-pressure fireproof cable |
| CN209232460U (en) * | 2019-01-09 | 2019-08-09 | 铜陵铜泉线缆科技有限公司 | A kind of reinforced aviation wire |
| CN209232461U (en) * | 2019-03-14 | 2019-08-09 | 远洋线缆有限公司 | A kind of flame-resistant insulation cable |
-
2019
- 2019-10-11 CN CN201910964091.3A patent/CN110767357A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11111074A (en) * | 1997-10-03 | 1999-04-23 | Yazaki Corp | Fire resistant electric wire |
| CN106298020A (en) * | 2016-10-14 | 2017-01-04 | 飞洲集团有限公司 | A kind of fire-resisting cable |
| CN207489561U (en) * | 2017-12-14 | 2018-06-12 | 昆明欧杰电缆制造有限公司 | Clean type low smoke and zero halogen flexible mineral matter insulated cable |
| CN208753032U (en) * | 2018-08-15 | 2019-04-16 | 苏州闪联高压电器有限公司 | A kind of low-pressure fireproof cable |
| CN209232460U (en) * | 2019-01-09 | 2019-08-09 | 铜陵铜泉线缆科技有限公司 | A kind of reinforced aviation wire |
| CN209232461U (en) * | 2019-03-14 | 2019-08-09 | 远洋线缆有限公司 | A kind of flame-resistant insulation cable |
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Application publication date: 20200207 |
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