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CN-122025268-A - Fire early-warning type temperature sensing fireproof cable

CN122025268ACN 122025268 ACN122025268 ACN 122025268ACN-122025268-A

Abstract

The invention relates to the technical field of mineral isolation type fireproof cables, in particular to a fire early warning type temperature sensing fireproof cable which comprises a conductor, a mica tape insulating layer, an XLPE reinforcing layer, a split-phase aluminum metal sheath, a mineral isolation layer and a low-smoke halogen-free flame retardant outer sheath. According to the invention, temperature and humidity dual-parameter real-time monitoring is realized, fire hazards of different grades can be accurately identified by three-threshold grading early warning, gradient prevention and control are realized, and fire occurrence is avoided from the source; the problem of single filament failure is thoroughly solved by adopting the double-filament redundant temperature measuring filament group, the dual effects of rapid conduction and high-temperature protection are realized by the gradient heat conducting adhesive layer, and centimeter-level positioning is realized by the temperature and humidity composite sensing and the radio frequency identification code; the whole thickness of sensing layer further attenuate, and elastic buffer liner and gradient heat conduction glue film alleviate mechanical stress, integrate electrostatic shielding simultaneously, reinforcing isolation layer intensity, wholly optimize fire prevention, mechanical, the electrical property of cable, adapt to entirely current NG A cable's production technology.

Inventors

  • DING XUEYAN
  • TIAN CHONGJUN
  • LIU YU
  • LI LINSEN
  • GE JIAJIA
  • YI FANG

Assignees

  • 远东电缆有限公司
  • 新远东电缆有限公司
  • 远东复合技术有限公司

Dates

Publication Date
20260512
Application Date
20260415

Claims (10)

  1. 1. The fire disaster early warning type temperature sensing fireproof cable comprises a conductor (1), a mica tape insulating layer (2), an XLPE reinforcing layer (3), a split-phase aluminum metal sheath (4), a mineral isolating layer (7) and a low-smoke halogen-free flame retardant outer sheath (8), and is characterized in that a flexible temperature sensing layer (5) is arranged between the split-phase aluminum metal sheath (4) and the mineral isolating layer (7), the flexible temperature sensing layer (5) is tightly attached to the split-phase aluminum metal sheath (4) and the mineral isolating layer (7), a high-temperature resistant gradient heat conducting adhesive layer (6) is coated between the flexible temperature sensing layer (5) and the split-phase aluminum metal sheath (4), and the gradient heat conducting adhesive layer (6) is of a heat conducting coefficient gradual change structure along the radial direction of the cable.
  2. 2. The fire early warning type temperature sensing fireproof cable according to claim 1, wherein the flexible temperature sensing layer (5) comprises a flexible temperature measuring wire set (51), a high temperature resistant packaging layer (52), a ceramic composite protective film (53) and an elastic buffer pad (54), the ceramic composite protective film (53) is coated outside the high temperature resistant packaging layer (52), and the elastic buffer pad (54) is arranged between the high temperature resistant packaging layer (52) and the ceramic composite protective film (53).
  3. 3. The fire disaster early warning type temperature sensing fireproof cable according to claim 2, wherein the flexible temperature measuring wire set (51) comprises at least two groups of flexible copper-based temperature measuring wires which are arranged in parallel, wherein a first temperature measuring wire is a core temperature measuring wire, a second temperature measuring wire is a redundant standby temperature measuring wire, the arrangement interval of the two groups of temperature measuring wires is 0.05-0.1 mm, and the diameters of the two groups of temperature measuring wires are 0.05-0.1 mm.
  4. 4. The fire disaster early warning type temperature sensing fireproof cable according to claim 1, wherein the temperature resistant range of the gradient heat conducting adhesive layer (6) is-60 ℃ to 220 ℃, the heat conducting coefficient of the side close to the split-phase aluminum metal sheath (4) is 3-5W/(m.K), the heat conducting coefficient of the side close to the flexible temperature sensing layer (5) is 1-2W/(m.K), and the temperature measuring response time of the cable is less than or equal to 0.3s.
  5. 5. The fire disaster early warning type temperature sensing fireproof cable according to claim 1, wherein the flexible temperature sensing layer (5) is continuously arranged along the length direction of the cable, an intelligent temperature measuring node (55) is arranged every 3-8 m, a unique radio frequency identification code and temperature and humidity composite sensing chip are arranged in each intelligent temperature measuring node (55), and the positioning error of the intelligent temperature measuring node (55) is less than or equal to 0.5m.
  6. 6. The fire early-warning type temperature sensing fireproof cable according to claim 5, wherein the flexible temperature sensing layer (5) has a three-threshold grading early-warning function, the first early-warning threshold is 70 ℃, the second early-warning threshold is 90 ℃, the fire critical threshold is 120 ℃, and when the corresponding threshold is reached, the intelligent temperature measuring node (55) outputs grading electric signals and triggers different grades of linkage control instructions.
  7. 7. The fire disaster early warning type temperature sensing fireproof cable according to claim 1, wherein the overall thickness of the flexible temperature sensing layer (5) is 0.1-0.25 mm, the thickness of the ceramic composite protective film (53) is 0.03-0.08 mm, the minimum bending radius of the cable is less than or equal to 8 times of the outer diameter of the cable, and the fire resistance time is more than or equal to 200min.
  8. 8. The fire disaster early warning type temperature sensing fireproof cable according to claim 1, wherein the mineral isolation layer (7) is an expansion type mineral composite layer, glass fiber reinforced ribs (71) which are uniformly distributed along the circumferential direction of the cable are embedded in the mineral isolation layer, the diameter of each glass fiber reinforced rib (71) is 0.1-0.2 mm, and the distribution interval is 0.5-1 mm.
  9. 9. The fire early-warning type temperature sensing fireproof cable according to claim 1, wherein an electrostatic shielding coating (81) is arranged on the inner side of the low-smoke halogen-free flame retardant outer sheath (8), the electrostatic shielding coating (81) is a graphene composite coating, the thickness of the low-smoke halogen-free flame retardant outer sheath (8) is 0.05-0.1 mm, the thickness of the low-smoke halogen-free flame retardant outer sheath (8) is 1.5-2.0 mm, and the oxygen index is not less than 38%.
  10. 10. The fire early-warning type temperature sensing fireproof cable according to claim 5, wherein the intelligent temperature measuring node (55) is connected with a remote monitoring terminal through a lora+485 dual communication mode, supports wireless ad hoc network and wired redundancy transmission, and the monitoring terminal can store cable temperature data in real time, analyze trend and predict faults, and can remotely calibrate threshold parameters of the temperature measuring node.

Description

Fire early-warning type temperature sensing fireproof cable Technical Field The invention relates to the technical field of mineral isolation type fireproof cables, in particular to a fire early-warning type temperature sensing fireproof cable. Background Ext> theext> existingext> NGext> -ext> Aext> mineralext> isolationext> fireproofext> cableext> onlyext> hasext> aext> passiveext> fireproofext> functionext>,ext> flameext> erosionext> isext> resistedext> byext> meansext> ofext> selfext> structureext> andext> materialsext> afterext> aext> fireext> disasterext> occursext>,ext> abnormalext> temperatureext> monitoringext> andext> earlyext> warningext> atext> theext> earlyext> stageext> ofext> theext> fireext> disasterext> canext> notext> beext> realizedext>,ext> whenext> theext> ambientext> temperatureext> ofext> theext> cableext> isext> abnormallyext> increasedext> orext> theext> cableext> itselfext> isext> locallyext> overheatedext>,ext> hiddenext> dangersext> canext> notext> beext> foundext> inext> timeext>,ext> theext> cableext> cannotext> beext> passivelyext> treatedext> afterext> theext> fireext> disasterext> occursext>,ext> andext> seriousext> propertyext> lossext> andext> casualtiesext> areext> easilyext> causedext>.ext> Meanwhile, the existing temperature measuring cable is characterized in that the sensing element is arranged on the outer surface of the cable, is easy to be interfered by external environment and worn, is not tightly combined with the cable body, has low temperature measuring precision, and can damage the fireproof structure and mechanical property of the cable and influence the fireproof effect if the sensing element is embedded into the cable. In addition, the sensing elements of the existing temperature measuring cable are of a monofilament structure, are prone to failure due to local damage, low in temperature measuring response speed and low in positioning accuracy, and cannot realize grading prevention and control due to the fact that single/double threshold early warning is only set, and meanwhile early warning signals are interrupted due to the fact that protective layers of the sensing elements are prone to failure due to rapid carbonization in fire disaster, meanwhile, signal loss is prone to occur due to the fact that temperature measuring data are transmitted in a single mode, and high reliability, high accuracy and full life cycle early warning requirements of high-end fireproof scenes are difficult to meet. In the fusion technology of the current fireproof cable and intelligent sensing, the balance of heat conduction efficiency and sensing protection, the combination of monofilament sensing and redundancy backup, grading early warning and linkage control adaptation are not realized, and the optimization of the cable structure does not consider the cooperative performance of a sensing layer, an isolation layer and an outer sheath, so that the fusion technology becomes a core technical bottleneck for restricting the industrial application of the intelligent fireproof cable. Disclosure of Invention The invention aims to solve the technical problems that the existing mineral isolation fireproof cable has no early warning function, the temperature measuring element is unreasonable to lay, and the original performance of the cable is easy to interfere. The technical scheme includes that the fire disaster early warning type temperature sensing fireproof cable comprises a conductor, a mica tape insulating layer, an XLPE reinforcing layer, a split-phase aluminum metal sheath, a mineral isolating layer and a low-smoke halogen-free flame retardant outer sheath, wherein a flexible temperature sensing layer is arranged between the split-phase aluminum metal sheath and the mineral isolating layer and is tightly attached to the split-phase aluminum metal sheath and the mineral isolating layer, a high-temperature-resistant gradient heat conducting adhesive layer is coated between the flexible temperature sensing layer and the split-phase aluminum metal sheath, and the gradient heat conducting adhesive layer is of a heat conducting coefficient gradual change structure along the radial direction of the cable. Further, the flexible temperature sensing layer comprises a flexible temperature measuring wire set, a high-temperature resistant packaging layer, a ceramic composite protective film and an elastic buffer liner, wherein the ceramic composite protective film is coated outside the high-temperature resistant packaging layer, and the elastic buffer liner is arranged between the high-temperature resistant packaging layer and the ceramic composite protective film. Further, the flexible temperature measuring wire group comprises at least two groups of flexible copper-based temperature measuring wires which are arranged in parallel, wherein a first temperature measuring wire is a core temperature measuring wire, a second temperature measuring wire is a redundant standby temperature measuring