CN216487357U - B1-grade flame-retardant control cable - Google Patents
B1-grade flame-retardant control cable Download PDFInfo
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- CN216487357U CN216487357U CN202122240666.2U CN202122240666U CN216487357U CN 216487357 U CN216487357 U CN 216487357U CN 202122240666 U CN202122240666 U CN 202122240666U CN 216487357 U CN216487357 U CN 216487357U
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Abstract
A B1-level flame-retardant control cable structurally comprises a cable core, wherein a reinforced non-woven fabric layer, a low-smoke halogen-free flame-retardant belt layer, a shielding layer, an inner heat insulation layer, an oxygen insulation layer, an outer heat insulation layer and an outer sheath are sequentially wrapped outside the cable core; the cable core is formed by filling and jointly twisting a plurality of wire cores and wire cores; the wire core is formed by wrapping an insulating layer outside a conductor; the conductor is formed by stranding copper monofilaments; the insulating layer is made of cross-linked polyethylene insulating material; the reinforced non-woven fabric is wrapped outside the cable core to form a reinforced non-woven fabric wrapping layer; the low-smoke halogen-free flame-retardant belt is wrapped outside the cable core to form a low-smoke halogen-free flame-retardant belt wrapping layer; the shielding layer is formed by weaving soft round copper wires; the inner heat insulation layer is formed by a wrapped low-smoke halogen-free flame-retardant belt; the oxygen-isolating layer is made of low-smoke halogen-free flame-retardant cable material; the outer heat insulation layer is composed of a low-smoke halogen-free flame-retardant belt which is sequentially wrapped inside and outside; the outer sheath is made of low-smoke halogen-free flame-retardant polyolefin sheath material. The cable has good mechanical, electrical and combustion performances, and has the characteristics of low toxicity and low corrosivity.
Description
Technical Field
This technical scheme belongs to cable technical field, specifically is a B1 level fire-retardant control cable.
Background
In recent years, along with the continuous development and progress of society, the safety awareness of people is gradually improved. In terms of cables, flame-retardant cables are widely used, but the flame-retardant cables alone cannot meet the needs of the modern society, and the main development trend of the modern cables is to make the cables more stable and safer. For the stability and safety analysis of the existing cables, the flame retardant grade B1 is the best choice. The B1 grade cable is a novel cable which is just emerging in recent years, and B1 grade cables are definitely adopted in key projects of many countries, such as the projects of the Western-Ann subway, the Suzhou subway, the Chongqing subway and the like in recent years.
Compared with the common low-smoke halogen-free cable, the B1-grade cable has the advantages of less released heat, less smoke generated and lower smoke toxicity when burning, and after the B1-grade cable is adopted, once a fire breaks out, the spread of the fire can be effectively inhibited, so that more guarantee is provided for the safety of life and property of people.
In the coming years, the B1-grade flame-retardant cable is widely applied to densely-populated public places such as high-rise buildings, subway stations, airports, hospitals and the like.
Disclosure of Invention
In order to solve the above problems in the prior art, the technical solution provides a B1-grade flame-retardant control cable and a manufacturing method thereof, specifically:
a B1-grade flame-retardant control cable structurally comprises a reinforced non-woven fabric layer 6, a low-smoke halogen-free flame-retardant belt layer 7, a shielding layer 8, an inner heat insulation layer 9, an oxygen insulation layer 10, an outer heat insulation layer 11 and an outer sheath 12 which are sequentially wrapped outside a cable core 5;
the cable core 5 is formed by jointly twisting a plurality of wire cores 3 and wire core fillers 4;
the wire core 3 is formed by wrapping an insulating layer 3 outside the conductor 1;
the conductor is formed by twisting copper monofilaments, the diameter range of the copper monofilaments is 0.52-0.53 mm, and the twisting pitch-diameter ratio is 22-24 times;
the insulating layer is made of cross-linked polyethylene insulating material; the thickness of the insulating layer is 0.6-1.0 mm;
the pitch range of the filling and twisting of the wire cores and the cable core is 18-20 times of the outer diameter of the cable core;
the reinforced non-woven fabric is wrapped outside the cable core to form a reinforced non-woven fabric wrapping layer;
the low-smoke halogen-free flame-retardant belt is wrapped outside the cable core to form a low-smoke halogen-free flame-retardant belt wrapping layer;
the shielding layer is formed by weaving soft round copper wires, and the weaving density is not less than 80%;
the inner heat insulation layer is composed of a wrapped low-smoke halogen-free flame-retardant belt, the wrapping covering rate is not less than 25%, the wrapping pitch is 35 +/-5 mm, the wrapping direction is the left direction, and the thickness of the low-smoke halogen-free flame-retardant belt is 0.2 mm;
the oxygen-isolating layer is made of low-smoke halogen-free flame-retardant cable materials, and the thickness of the oxygen-isolating layer is 1.0-1.2 mm; (the low-smoke halogen-free flame-retardant cable material can be selected from the trade name P204H-B1);
the outer heat insulation layer is formed by sequentially wrapping low-smoke halogen-free flame-retardant tapes inside and outside; the lapping covering rate of the two layers of low-smoke halogen-free flame-retardant tapes is not less than 25%, the lapping pitches are 35 +/-5 mm, and the thicknesses of the low-smoke halogen-free flame-retardant tapes are 0.2 mm; the wrapping direction of the low-smoke halogen-free flame-retardant belt on the inner layer is the left direction, and the wrapping direction of the low-smoke halogen-free flame-retardant belt on the outer layer is the right direction;
the outer sheath is made of low-smoke halogen-free flame-retardant polyolefin sheath material; the nominal thickness of the outer sheath is 1.2-2.0 mm. An alternative designation for jacket material is P202H-B1).
Further optimization:
the conductor is formed by twisting annealed bare copper monofilaments, the oxygen content of copper in the bare copper monofilaments is not more than 0.005%, the volume resistivity at 20 ℃ is not more than 0.017241 omega, mm2/m, the nominal diameter range of the bare copper monofilaments is 0.52-0.53 mm, and the nominal diameter of the conductor is 1.6 mm.
The thickness of the insulating layer is 0.65-0.70 mm.
The cable core is filled with dust-free rock wool, and the diameter of the dust-free rock wool is 3.0 mm.
The lapping cover rate of the reinforced non-woven fabric is not less than 25%, the lapping direction is leftward, and the thickness of the reinforced non-woven fabric is 0.16 mm.
The lapping and covering rate of the low-smoke halogen-free flame-retardant belt is not less than 25%, the lapping direction is the right direction, and the thickness of the low-smoke halogen-free flame-retardant belt is 0.2 mm.
The diameter of the soft round copper wire in the shielding layer is 0.180 mm-0.185 mm, the weaving pitch is 66mm, and the weaving density is 80% -82%.
The conductor of the structure can meet the requirements of GB/T3956-.
After the technical scheme is adopted, the utility model has the following beneficial effects:
the conductor is a class 2 stranded copper conductor which meets the requirement of GB/T3956, has higher toughness and is convenient to construct and operate;
the insulating layer is formed by extruding crosslinked polyethylene insulating materials, and has excellent electrical property, mechanical and physical properties and processability;
the shielding layer is braided and shielded by copper wires, so that the shielding layer has good shielding performance and softness;
the inner heat insulation layer, the oxygen insulation layer and the outer heat insulation layer are respectively arranged outside the shielding layer to form a multiple protection structure, so that the heat transferred to the cable core when the cable is burnt can be effectively reduced, the insulation can be effectively protected, the insulation burning is avoided, and the generation of heat and smoke is reduced;
the outer sheath not only has excellent anti-cracking performance, mechanical and physical properties and processing performance, but also has excellent combustion crusting performance, and further ensures the stability of the cable combustion performance.
The cable meets the requirements of GB 31247-2014 toxicity index t0 and corrosivity grade a 1.
The cable has good mechanical property, electrical property and excellent combustion property, and has the characteristics of low toxicity, low corrosivity and low smoke toxicity.
Drawings
Fig. 1 is a schematic radial cross-sectional structure of an example cable.
In the figure: the cable comprises a conductor 1, an insulating layer 2, a wire core 3, a cable core filler 4, a cable core 5, a reinforced non-woven fabric layer 6, a low-smoke halogen-free flame-retardant belt layer 7, a shielding layer 8, an inner heat insulation layer 9, an oxygen insulation layer 10, an outer heat insulation layer 11 and an outer sheath 12.
Detailed Description
The technical solution is further explained in detail with reference to the drawings and the specific embodiments.
Referring to fig. 1, a B1-grade flame-retardant control cable has a structure that a reinforced non-woven fabric layer 6, a low-smoke halogen-free flame-retardant tape layer 7, a shielding layer 8, an inner heat insulation layer 9, an oxygen insulation layer 10, an outer heat insulation layer 11 and an outer sheath 12 are sequentially wrapped outside a cable core 5;
the cable core 5 is formed by jointly twisting a plurality of wire cores 3 and wire core fillers 4;
the wire core 3 is formed by wrapping an insulating layer 3 outside the conductor 1;
the conductor is formed by twisting copper monofilaments, the diameter range of the copper monofilaments is 0.52-0.53 mm, and the twisting pitch-diameter ratio is 22-24 times;
the insulating layer is made of cross-linked polyethylene insulating material; the thickness of the insulating layer is 0.6-1.0 mm;
the pitch range of the filling and twisting of the wire cores and the cable core is 18-20 times of the outer diameter of the cable core;
the reinforced non-woven fabric is wrapped outside the cable core to form a reinforced non-woven fabric wrapping layer;
the low-smoke halogen-free flame-retardant belt is wrapped outside the cable core to form a low-smoke halogen-free flame-retardant belt wrapping layer;
the shielding layer is formed by weaving soft round copper wires, and the weaving density is not less than 80%;
the inner heat insulation layer is composed of a wrapped low-smoke halogen-free flame-retardant belt, the wrapping covering rate is not less than 25%, the wrapping pitch is 35 +/-5 mm, the wrapping direction is the left direction, and the thickness of the low-smoke halogen-free flame-retardant belt is 0.2 mm;
the oxygen-isolating layer is made of low-smoke halogen-free flame-retardant cable materials, and the thickness of the oxygen-isolating layer is 1.0-1.2 mm; in this example, the low-smoke halogen-free flame-retardant cable material is P204H-B1;
the outer heat insulation layer is formed by sequentially wrapping low-smoke halogen-free flame-retardant tapes inside and outside; the lapping covering rate of the two layers of low-smoke halogen-free flame-retardant tapes is not less than 25%, the lapping pitches are 35 +/-5 mm, and the thicknesses of the low-smoke halogen-free flame-retardant tapes are 0.2 mm; the wrapping direction of the low-smoke halogen-free flame-retardant belt on the inner layer is the left direction, and the wrapping direction of the low-smoke halogen-free flame-retardant belt on the outer layer is the right direction;
the outer sheath is made of low-smoke halogen-free flame-retardant polyolefin sheath material; the nominal thickness of the outer sheath is 1.2-2.0 mm. In this example, the jacket material is designated P202H-B1.
In the present example:
the conductor is formed by stranding annealed bare copper monofilaments, the oxygen content of copper in the bare copper monofilaments is not more than 0.005%, the volume resistivity at 20 ℃ is not more than 0.017241 omega, mm2/m, the nominal diameter range of the bare copper monofilaments is 0.52 mm-0.53 mm, and the nominal diameter of the conductor is 1.6 mm.
The thickness of the insulating layer is 0.65-0.70 mm.
The cable core is filled with dust-free rock wool, and the diameter of the dust-free rock wool is 3.0 mm.
The lapping and covering rate of the reinforced non-woven fabric is not less than 25%, and the lapping direction is left; the thickness of the reinforced non-woven fabric is 0.16 mm.
The lapping and covering rate of the low-smoke halogen-free flame-retardant belt is not less than 25%, and the lapping direction is the right direction; the thickness of the low smoke halogen-free flame retardant tape is 0.2 mm.
The diameter of the soft round copper wire in the shielding layer is 0.180 mm-0.185 mm, the weaving pitch is 66mm, and the weaving density is 80% -82%.
Through detection, the cable of the embodiment has the characteristics that:
1) good electrical performance
And (3) wire core withstand voltage test: applying an alternating voltage of 2kV between water and the wire core for 5min, so that the cable is not broken down;
and (3) voltage test of a finished product: applying an alternating voltage of 3.0kV between the wire core and the wire core or between the wire core and the shield, and keeping the cable from breaking down for 5 min;
insulation resistance: the insulation resistance of the cable at the highest working temperature is more than or equal to 3000 MOmega-km;
2) excellent mechanical properties
The tensile strength before insulation aging is not less than 12.5Mpa, and the elongation at break is not less than 200%; after aging, the change rate of tensile strength is not more than 25%, and the change rate of elongation at break is not more than 25%. The tensile strength of the sheath before aging is not less than 9.0Mpa, and the elongation at break is not less than 125%; after aging, the tensile strength is not less than 9.0Mpa, and the elongation at break is not less than 110%; the change rate of the tensile strength is not more than 30 percent, and the change rate of the elongation at break is not more than 30 percent.
3) The insulating layer has the shrinkage resistance, the insulating layer has the shrinkage rate of not more than 4% at the temperature of 130 +/-2 ℃ for 1 hour;
4) the outer sheath has anti-cracking performance, the outer sheath is sleeved at the temperature of 150 +/-2 ℃ for 1 hour, and the outer sheath does not crack;
5) combustion performance:
under the fire source of 20.5kW,
excellent flame retardant properties: the spread height (FS) of the bundled flame is less than or equal to 1.5m, and the spread height of the single vertical flame is less than or equal to 425 mm;
lower heat release during combustion and lower heat release rate: the Heat Release Rate (HRR) is less than or equal to 30 kW; the total heat release (THR1200) in the fire 1200s is less than or equal to 15MJ, and the combustion growth rate is less than or equal to 150W/s;
less smoke is generated during combustion: the peak value of the Smoke Production Rate (SPR) is less than or equal to 0.25m2The Total Smoke Production (TSP) in 1200s of fire is less than or equal to 50m2；
Good low smoke and halogen free performance: the smoke density (minimum light transmittance It) is more than or equal to 60 percent; the conductivity of the corrosivity grade is less than or equal to 2.5 mu s/mm, and the pH value is more than or equal to 4.3;
low toxicity, low corrosivity, and the grade of smoke toxicity is ZA2
No drop/particle or trace drop during combustion;
the toxicity of the flue gas generated during combustion satisfies t0The requirement is that the toxicity grade of the flue gas reaches ZA2 grade, and the corrosivity grade reaches a1 grade; ,
5) environmental protection performance
The cable is produced by adopting environment-friendly materials, the acid gas content of the cable is less than or equal to 0.5 percent, and the fluorine content of the cable is less than or equal to 0.1 percent.
Claims (7)
1. A B1-grade flame-retardant control cable is characterized in that a reinforced non-woven fabric layer, a low-smoke halogen-free flame-retardant belt layer, a shielding layer, an inner heat insulation layer, an oxygen insulation layer, an outer heat insulation layer and an outer sheath are sequentially wrapped outside a cable core;
the cable core is formed by filling and jointly twisting a plurality of wire cores and wire cores;
the wire core is formed by wrapping an insulating layer outside a conductor;
the conductor is formed by twisting copper monofilaments, the diameter range of the copper monofilaments is 0.52-0.53 mm, and the twisting pitch-diameter ratio is 22-24 times;
the insulating layer is made of cross-linked polyethylene insulating material; the thickness of the insulating layer is 0.6-1.0 mm;
the pitch range of the filling and twisting of the wire cores and the cable core is 18-20 times of the outer diameter of the cable core;
the reinforced non-woven fabric is wrapped outside the cable core to form a reinforced non-woven fabric wrapping layer;
the low-smoke halogen-free flame-retardant belt is wrapped outside the cable core to form a low-smoke halogen-free flame-retardant belt wrapping layer;
the shielding layer is formed by weaving soft round copper wires, and the weaving density is not less than 80%;
the inner heat insulation layer is formed by a lapped low-smoke halogen-free flame-retardant belt, the lapping and covering rate of the lapping is not less than 25%, the lapping pitch is 35 +/-5 mm, the lapping direction is the left direction, and the thickness of the low-smoke halogen-free flame-retardant belt is 0.2 mm;
the oxygen-isolating layer is made of low-smoke halogen-free flame-retardant cable materials, and the thickness of the oxygen-isolating layer is 1.0-1.2 mm;
the outer heat insulation layer is formed by sequentially wrapping low-smoke halogen-free flame-retardant tapes inside and outside; the lapping covering rate of the two layers of low-smoke halogen-free flame-retardant tapes is not less than 25%, the lapping pitches are 35 +/-5 mm, and the thicknesses of the low-smoke halogen-free flame-retardant tapes are 0.2 mm; the wrapping direction of the low-smoke halogen-free flame-retardant belt on the inner layer is the left direction, and the wrapping direction of the low-smoke halogen-free flame-retardant belt on the outer layer is the right direction;
the outer sheath is made of low-smoke halogen-free flame-retardant polyolefin sheath material; the nominal thickness of the outer sheath is 1.2-2.0 mm.
2. The B1-grade fire-retardant control cable of claim 1, wherein the conductor is formed by stranding annealed bare copper filaments, the bare copper filaments having a copper oxygen content of not more than 0.005% and a volume resistivity of not more than 0.017241 Ω -mm at 20 ℃2The nominal diameter of the conductor is 1.6 mm.
3. The B1-grade flame-retardant control cable according to claim 1, wherein the thickness of the insulating layer is 0.65-0.70 mm.
4. The class B1 fire-retardant control cable of claim 1, wherein the cable core filler is comprised of dust-free rock wool rope having a diameter of 3.0 mm.
5. The flame-retardant control cable of B1 grade according to claim 1, wherein the reinforced non-woven fabric has a lapping coverage of not less than 25%, a left lapping direction, and a thickness of 0.16 mm.
6. The B1-grade flame-retardant control cable according to claim 1, wherein the lapping coverage rate of the low-smoke halogen-free flame-retardant tape is not less than 25%, the lapping direction is right, and the thickness of the low-smoke halogen-free flame-retardant tape is 0.2 mm.
7. The fire-retardant control cable of grade B1 as claimed in claim 1, wherein the soft round copper wire in the shielding layer has a diameter of 0.180mm to 0.185mm, a weaving pitch of 66mm, and a weaving density of 80% to 82%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122240666.2U CN216487357U (en) | 2021-09-16 | 2021-09-16 | B1-grade flame-retardant control cable |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122240666.2U CN216487357U (en) | 2021-09-16 | 2021-09-16 | B1-grade flame-retardant control cable |
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| CN216487357U true CN216487357U (en) | 2022-05-10 |
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| CN202122240666.2U Active CN216487357U (en) | 2021-09-16 | 2021-09-16 | B1-grade flame-retardant control cable |
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| CN (1) | CN216487357U (en) |
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- 2021-09-16 CN CN202122240666.2U patent/CN216487357U/en active Active
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