CN215265667U - Fire-resistant and fire-resistant fireproof cable - Google Patents
Fire-resistant and fire-resistant fireproof cable Download PDFInfo
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- CN215265667U CN215265667U CN202120655179.XU CN202120655179U CN215265667U CN 215265667 U CN215265667 U CN 215265667U CN 202120655179 U CN202120655179 U CN 202120655179U CN 215265667 U CN215265667 U CN 215265667U
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Abstract
The utility model relates to a fireproof cable of high temperature resistant, fire-resistant fire-retardant type includes by interior outside in proper order: the cable comprises a cable core, a fire-resistant flame-retardant layer, an inner protection layer, a metal protection layer and an outer protection layer; the cable core comprises cable cores and filling layers filled among the cable cores; the wire core consists of a conductor and an insulating layer wrapped outside the conductor; the fire-resistant flame-retardant layer and the insulating layer are made of high-temperature-resistant materials; the insulating layer is formed by compounding a ceramic mineral insulating layer and a mica mineral insulating layer; the inner protection layer consists of an extrusion layer and a wrapping layer coated outside the extrusion layer; the extrusion layer is made of a halogen-free low-smoke ethylene-vinyl acetate sheathing material, and the wrapping layer is made of glass fiber prepreg. The utility model discloses a fireproof cable can pass through 2000 degrees F, 360 min's fire-resistant test, has high temperature resistant, and fire-resistant fire-retardant no drippage's advantage to keep circuit integrality.
Description
Technical Field
The utility model relates to the technical field of cables, concretely relates to fireproof cable of high temperature resistant, fire-resistant fire-retardant type.
Background
The fireproof cable is mainly used as a power and signal control circuit in a flammable environment and is widely applied to places with high fireproof requirements, such as power stations, petrochemicals, metallurgy, light textiles, high-rise buildings and the like. The fireproof cable is coated on the conductor wire core by adopting a high-performance fireproof material, and is additionally provided with a steel wire or copper strip protective sleeve, so that power supply and signal transmission can be ensured to be continued within a certain time after a fire disaster, generally not shorter than 3h, normal operation of lighting and important equipment is maintained, and people can be guaranteed to have enough time to safely evacuate and extinguish fire for emergency.
The fireproof cable is also called a mineral insulated cable such as a metal pipe magnesium oxide cable, and is called MI cable for short, and is composed of a copper core, a steel sheath and a magnesium oxide insulating material. The cable has the characteristics of high fire resistance, high temperature resistance, mechanical force damage prevention and the like, the long-term use temperature is 250 ℃, the temperature can be maintained for 3h (international regulation for 90min) at 950-1000 ℃, and the melting point of copper can be close to 1083 ℃ in a short time or in an abnormal time. But are relatively expensive to manufacture and do not have the flexibility of typical cables.
With the rapid development of modern construction, electric power systems, rail transit, airports, subways, key projects, public buildings and the like grow up like spring shoots after rain. Particularly, in high-rise and super high-rise buildings, people need a long time for escaping and evacuating, which puts higher requirements on the fireproof cable, on one hand, the fireproof cable cannot become a main body causing fire, on the other hand, the fireproof cable cannot spread the fire, and provides reliable support for people evacuation and escape. At present, most fireproof cables are considered to be fireproof cables only through 950 ℃ and 180min fire resistance tests, reliability in actual use cannot be guaranteed through the tests, and drops are generated to easily cause damage in a larger range, so that great risk exists. In order to satisfy market to higher grade fireproof cable needs, the utility model provides a fireproof cable of fire-resistant fire-retardant type with resistant ultra-temperature, overtime-length.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem of reliability of the practical application of the fireproof cable, the fireproof cable with high temperature resistance and fire resistance is provided. The utility model discloses a fireproof cable can pass through 2000 degrees F, 360 min's fire resistance test to keep circuit integrality.
In order to achieve the above purpose, the utility model discloses a following technical scheme realizes:
the utility model provides a fire prevention cable of high temperature resistant, fire-resistant fire-retardant type, includes by interior outside in proper order: the cable comprises a cable core, a fire-resistant flame-retardant layer, an inner protection layer, a metal protection layer and an outer protection layer; the cable core comprises cable cores and filling layers filled among the cable cores; the wire core consists of a conductor and an insulating layer wrapped outside the conductor; the fire-resistant flame-retardant layer and the insulating layer are made of high-temperature-resistant materials.
Further, the conductor is composed of more than 6 copper monofilaments; the number of the wire cores is at least 3. The conductor is made by precisely drawing 6 or more thin copper monofilaments and carrying out constant-temperature constant-pressure homogenization annealing.
Further, the insulating layer is formed by compounding a ceramic mineral insulating layer and a mica mineral insulating layer, and the mica mineral insulating layer is arranged outside the ceramic mineral insulating layer; the mica mineral insulating layer is made of mica tapes, and the mica tapes are provided with a net structure formed by glass fibers. The ceramic mineral insulating layer and the mica mineral insulating layer are made of ceramic mineral insulating materials and mica insulating materials respectively, the ceramic mineral insulating materials and the mica mineral insulating materials are both inorganic high-temperature-resistant materials, ceramic armor bodies can be rapidly generated at the temperature of 550 ℃ and above, the armor bodies are hard and compact, the ceramic hard armor bodies play the functions of fire insulation and temperature resistance, insulation is sintered at the temperature of 950 ℃ plus or minus 40 ℃, residues are more than or equal to 85 percent and are inorganic mineral substances, the inorganic mineral insulating materials are not combusted and do not delay combustion, and smoothness of a line is effectively guaranteed. The glass fiber network on the mica tape may protect the integrity of the internal structure.
Further, the material of the filling layer is a flame-retardant filling rope. The performance meets the ten detection requirements of R0HS latest standard (EU)2015/863, the unit gram weight is less than or equal to 5g/m, the flame retardant performance is not delayed, and the flame retardant filling rope is an environment-friendly flame retardant filling rope.
Further, the fire-resistant flame-retardant layer is an alkali-free glass fiber tape layer. And the glass fiber yarns are formed by tightly weaving warps and wefts which are vertically distributed in an overlapped wrapping manner, the weaving density is more than or equal to 90%, and the high-temperature-resistant and high-flame-retardant effect can be achieved.
Furthermore, the inner protection layer consists of an extrusion layer and a wrapping layer coated outside the extrusion layer, and the thickness of the extrusion layer is larger than that of the wrapping layer; the material of the extrusion layer is a low-smoke halogen-free flame-retardant cable material extrudate, and the material of the wrapping layer is a glass fiber prepreg. The extrusion layer contains inorganic flame retardants such as magnesium hydroxide and aluminum hydroxide, the inorganic flame retardants are formed into shells at high temperature, and the inorganic shell layers are prevented from falling off under the protection of the wrapping layer, so that the good flame retardant property is maintained.
Further, the metal sheath is an austenitic stainless steel strip interlocking armor layer. The material is preferably thin austenitic stainless steel, is subjected to solid solution strengthening treatment, has good toughness, good processability and good corrosion resistance, has a melting point of about 1400 ℃, can effectively isolate flame, resist high-temperature impact and improve the fire-resistant grade of the cable, and the elongation is more than or equal to 35%; the interlocking armor can be self-locked, and even if the cable is broken due to the fact that external force impact is caused locally, the cable still keeps complete and cannot be scattered.
Further, the outer protective layer is made of a halogen-free low-smoke ethylene-vinyl acetate sheath material. For example, the B1 grade flame-retardant cable of Chinese patent 201811465313.9 is a halogen-free low-smoke ethylene-vinyl acetate sheath material. Has the advantages of low heat release, low smoke production, low smoke toxicity and no delayed burning of dripping substances.
The beneficial technical effects are as follows:
the utility model discloses high temperature resistant, fire-resistant fire-retardant type's cable core is by the conductor, the parcel constitutes and the filling layer constitutes at conductor outer insulating layer, the insulating layer adopts composite construction, form by ceramic mineral insulating layer and mica mineral insulating layer complex, mica mineral insulating layer is in ceramic mineral insulating layer's outside, mica mineral insulating layer's material is the mica tape, still have the network structure that glass fiber constitutes on the mica tape, adopt this mesostructure on the one hand can become compact shell under high temperature, effectively isolate flame temperature and break down between the phase and the phase that the invasion of water spray of putting out a fire leads to, on the other hand adopts the mica tape cladding that has network structure, can guarantee the integrality of cable core structure under the external force impact; meanwhile, the two layers of materials are both basically inorganic matters, so that the insulating property is good, and the insulating resistance can reach 100000M omega at room temperature. Wrapping the alkali-free glass fiber tape fire-resistant flame-retardant layer, the low-smoke halogen-free flame-retardant cable material extrusion layer and the glass fiber prepreg wrapping layer outside the cable core, achieving the effects of isolation, high temperature resistance, flame retardance, heat insulation, cooling and protection of the structure in cooperation, and effectively reducing the temperature in the cable core (by about 60%) at the flame temperature. The metal material with high strength and high melting point is adopted as the metal sheath interlocking armor, so that the cable can be prevented from melting when being subjected to fire resistance and impact, and the isolation effect of protecting the internal structure from damage is achieved. And finally, taking the halogen-free low-smoke ethylene-vinyl acetate sheath material as an outer protective layer, insulating and cooling, insulating and forming porcelain, sealing and waterproofing, and ensuring electrical property.
The utility model discloses a fireproof cable has resistant ultra-high temperature, the fire resistance characteristic of overlength, and the burning is nontoxic, pollution-free, does not prolong characteristics such as fire, dampproofing and waterproofing, resistant mechanical shock is good, satisfies the B1 level fire-retardant type fireproof cable of GB 31247 "cable and optical cable combustion performance are hierarchical" and GB 51348 "civil building electrical design standard" requirement. Referring to and in conjunction with the provisions of UL 1709 and BS 8491, fire, spray and impact tests were performed on the same cable at a fire test temperature of 2000 ° f (1093 ℃) for 360min to maintain line integrity; the cable does not generate toxic and harmful substances, does not spread flame, effectively ensures the smoothness of the line, and is a real flame-retardant fireproof cable.
Drawings
Fig. 1 is a schematic cross-sectional view of a fire-resistant cable of a fire-resistant type according to example 1.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, 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 work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated as the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., appear based on the directions or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" should be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; 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.
The present invention will be further described with reference to the accompanying drawings and specific embodiments, but the scope of the invention is not limited thereto.
Example 1
A fire-resistant, fire-resistant and fire-retardant fireproof cable is shown in figure 1 in a cross-sectional structure and sequentially comprises from inside to outside: the cable comprises a cable core, a fireproof flame-retardant layer 4, an inner protection layer, a metal protection layer 7 and an outer protection layer 8; the cable core comprises cable cores and a filling layer 3 filled among the cable cores; the wire core consists of a conductor 1 and an insulating layer 2 wrapped outside the conductor 1; the fire-resistant flame-retardant layer 4 and the insulating layer 2 are made of high-temperature-resistant materials.
Wherein, the conductor 1 is composed of more than 6 copper monofilaments; the line cores are 5 groups. The conductor 1 is made by 6 or more fine copper monofilaments after precise wire drawing and constant-temperature and constant-pressure homogenizing annealing.
The insulating layer 2 is formed by compounding a ceramic mineral insulating layer and a mica mineral insulating layer, and the mica mineral insulating layer is arranged outside the ceramic mineral insulating layer; the mica mineral insulating layer is made of mica tapes, and the mica tapes are provided with a net structure formed by glass fibers. The ceramic mineral insulating layer and the mica mineral insulating layer are made of ceramic mineral insulating materials and mica insulating materials respectively, the ceramic mineral insulating materials and the mica mineral insulating materials are both inorganic high-temperature resistant materials, a ceramic armor body can be rapidly generated at the high temperature of 550 ℃ and above, the armor body is hard and compact, the ceramic hard armor body plays a role in fire insulation and temperature resistance, insulation is sintered at the high temperature of 950 ℃ +/-40 ℃, residues are more than or equal to 85 percent and are inorganic minerals, and the inorganic mineral insulating materials are non-combustible and do not delay combustion. The glass fiber network on the mica tape may protect the integrity of the internal structure.
Wherein, the material of the filling layer 3 is a flame-retardant filling rope. The performance meets the ten detection requirements of R0HS latest standard (EU)2015/863, the unit gram weight is less than or equal to 5g/m, the flame retardant performance is not delayed, and the flame retardant filling rope is an environment-friendly flame retardant filling rope.
Wherein, the fire-resistant flame-retardant layer 4 is an alkali-free glass fiber tape layer. And the glass fiber yarns are formed by tightly weaving warps and wefts which are vertically distributed in an overlapped wrapping manner, the weaving density is more than or equal to 90%, and the high-temperature-resistant and high-flame-retardant effect can be achieved.
The inner sheath layer is composed of an extrusion layer 5 and a wrapping layer 6 coated outside the extrusion layer 5, and the thickness of the extrusion layer 5 is larger than that of the wrapping layer 6; the material of the extrusion layer 5 is a low-smoke halogen-free flame-retardant cable material extrudate, and the material of the wrapping layer 6 is a glass fiber prepreg (different from the fire-resistant flame-retardant layer 4, the glass fiber prepreg is a composite material consisting of glass fibers and infiltration resin, and the fire-resistant flame-retardant layer 4 is a pure glass fiber material). The extrusion layer contains inorganic flame retardants such as magnesium hydroxide and aluminum hydroxide, the inorganic flame retardants are formed into shells at high temperature, and the inorganic shell layers are prevented from falling off under the protection of the wrapping layer, so that the good flame retardant property is maintained.
The metal sheath 7 is an austenitic stainless steel strip interlocking armor layer. The material is preferably thin austenitic stainless steel, is subjected to solid solution strengthening treatment, has good toughness, good processability and good corrosion resistance, has a melting point of about 1400 ℃, can effectively isolate flame, resist high-temperature impact and improve the fire-resistant grade of the cable, and the elongation is more than or equal to 35%; the interlocking armor can be self-locked, and even if the cable is broken due to the fact that external force impact is caused locally, the cable still keeps complete and cannot be scattered.
Wherein, the outer protective layer 8 is made of halogen-free low-smoke ethylene-vinyl acetate sheathing material. For example, the B1 grade flame-retardant cable of Chinese patent 201811465313.9 is a halogen-free low-smoke ethylene-vinyl acetate sheath material. Has the advantages of low heat release, low smoke production, low smoke toxicity and no delayed burning of dripping substances.
Comparative example 1
The cable structure of this comparative example was the same as example 1 except that the metal sheath was removed.
Comparative example 2
The cable structure of this comparative example is the same as that of example 1, except that a single-layer mica tape is used as the insulating layer.
Comparative example 3
The cable structure of the comparative example is the same as that of example 1, except that the outermost layer of the sheath is made of polyvinyl chloride sheath material.
Example 2
The results of the performance tests on the example 1 and comparative example cables are shown in table 1.
Table 1 results of performance test of example 1 and comparative example cables
As can be seen from table 1, the utility model discloses fire-resistant, spray and impact test are carried out to the regulation that the whole reference of fireproof cable combines UL 1709 and BS 8491 on same cable, and fire-resistant test temperature is 2000 ℉ (1093 deg.C), and fire-resistant time is 360min, keeps circuit integrality. The utility model discloses fireproof cable has and does not have drippage (B1 level d)0) No toxicity (the toxicity of the smoke reaches t0 level) and no corrosivity (the corrosivity reaches a1 level).
Still tested the carbonization height in addition, the utility model discloses fire prevention cable is whole can satisfy the experimental requirement of the fire-retardant A class of GB/T18380.33 regulation (non-metallic material is 7L/m, and test time is 40min, and the carbonization height is less than or equal to 2.5m) to reach super A class requirement (non-metallic material is 14L/m promptly, and test time is 80min, and the carbonization height is less than or equal to 1.0 m). Furthermore the utility model discloses the whole bending test and the flattening test that satisfy GB/T13033.1 regulation of fireproof cable, the metal sheath does not have the fracture and soak after the experiment, stands 1/2 rated voltage 5min, does not take place to puncture.
The above description is only the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution and the concept of the present invention within the technical scope disclosed in the present invention.
Claims (7)
1. The utility model provides a fireproof cable of high temperature resistant, fire-resistant difficult type which characterized in that, by interior structure outside to include in proper order: the cable comprises a cable core, a fire-resistant flame-retardant layer (4), an inner protection layer, a metal protection layer (7) and an outer protection layer (8); the cable core comprises cable cores and a filling layer (3) filled among the cable cores; the wire core consists of a conductor (1) and an insulating layer (2) wrapped outside the conductor (1);
the insulating layer (2) is formed by compounding a ceramic mineral insulating layer and a mica mineral insulating layer, and the mica mineral insulating layer is arranged outside the ceramic mineral insulating layer; the mica mineral insulating layer is made of mica tapes, and the mica tapes are provided with a net structure formed by glass fibers.
2. A fire-resistant, fire-resistant and fire-retardant type fireproof cable according to claim 1, wherein the conductor (1) is composed of 6 or more copper monofilaments; the number of the wire cores is at least 3.
3. A fire-resistant, fire-retardant type fireproof cable according to claim 1, wherein the material of the filler layer (3) is a fire-retardant filler rope.
4. A fire-resistant, fire-retardant type fireproof cable according to claim 1, wherein the fire-resistant and fire-retardant layer (4) is an alkali-free fiberglass tape layer.
5. The high-temperature-resistant fire-retardant fireproof cable according to claim 1, wherein the inner sheath layer is composed of an extruded layer (5) and a wrapping layer (6) coated outside the extruded layer (5), and the thickness of the extruded layer (5) is greater than that of the wrapping layer (6); the material of the extrusion layer (5) is a low-smoke halogen-free flame-retardant cable material extrudate, and the material of the wrapping layer (6) is a glass fiber prepreg.
6. A fire-resistant, fire-retardant type fireproof cable according to claim 1, wherein the metal sheath (7) is an austenitic stainless steel strip interlocked armor.
7. The high-temperature-resistant, fire-resistant and flame-retardant fireproof cable according to claim 1, wherein the outer sheath (8) is made of a halogen-free low-smoke ethylene-vinyl acetate sheath material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120655179.XU CN215265667U (en) | 2021-03-31 | 2021-03-31 | Fire-resistant and fire-resistant fireproof cable |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120655179.XU CN215265667U (en) | 2021-03-31 | 2021-03-31 | Fire-resistant and fire-resistant fireproof cable |
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| Publication Number | Publication Date |
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| CN215265667U true CN215265667U (en) | 2021-12-21 |
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| CN202120655179.XU Active CN215265667U (en) | 2021-03-31 | 2021-03-31 | Fire-resistant and fire-resistant fireproof cable |
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- 2021-03-31 CN CN202120655179.XU patent/CN215265667U/en active Active
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