CN209980806U

CN209980806U - Mineral fireproof cable

Info

Publication number: CN209980806U
Application number: CN201921107715.1U
Authority: CN
Inventors: 李耿
Original assignee: Guangzhou Dongfeng Cable Co Ltd
Current assignee: Guangzhou Dongfeng Cable Co Ltd
Priority date: 2019-07-15
Filing date: 2019-07-15
Publication date: 2020-01-21
Anticipated expiration: 2029-07-15

Abstract

The utility model aims to provide a mineral fireproof cable, the mineral fireproof cable comprises a ceramic polyolefin outer sheath, an armor layer, a heat dissipation layer, a wrapping layer and a predetermined number of cable cores from outside to inside in sequence, the ceramic polyolefin outer sheath can rapidly generate a complete ceramic shell under the temperature or flame condition of more than 650 ℃, the ceramic polyolefin outer sheath and the armor layer can prevent the damage of high-temperature flame to the inner cable core together, a mineral filling layer is arranged between the wrapping layer and the cable core, the heat dissipation layer can reduce the inner temperature when the cable normally works, the steam generated by decomposing the mineral layer is favorably output when encountering fire, the inner temperature of the mineral fireproof cable is reduced, the damage of external high temperature to the inner cable core is delayed, the cable core adopts the ceramic polyolefin inner sheath as the insulation of the cable core, the cable core can still be ensured to run for a period when the external cable core structure fails, in addition, the armor layer can provide good mechanical properties for the mineral fireproof cable.

Description

Mineral fireproof cable

Technical Field

The utility model relates to the technical field of cables, especially, relate to a mineral fireproof cable.

Background

With the rapid development of economic society, a certain number of cables are arranged in building facilities, town streets with relatively dense population, residential districts, underground railways, underground streets, large-scale power stations and important industrial and mining enterprises, the cables in the areas are influenced by complicated natural and human factors, and in order that secondary disasters caused by damage of the power cables can not happen under the condition that a power accident causes a fire or suffers from the fire, the power cables are required to have a certain fireproof function, and the power cables can normally transmit electric energy and various control signals and alarm signals within a certain time when the fire happens and can keep safe operation for a period of time, namely under the condition of certain flame temperature combustion, so that lighting, fireproof alarm devices and other emergency equipment can normally operate within a certain time. The existing fireproof cable is mainly structurally characterized in that damage to an internal structure caused by external high-temperature flame is avoided, and the internal structure of the cable is also very important for preventing fire when a power accident happens.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a mineral fireproof cable that fire-protection rating is high, mechanical properties is good, the interior outer structure combined action of mineral fireproof electricity can effectively strengthen fire behavior.

The utility model provides a mineral fireproof cable, it includes predetermined quantity's cable core, mineral fireproof cable is by interior and outer including predetermined quantity's cable core, one around covering, a heat dissipation layer, an armor and a pottery polyolefin oversheath, the cable core is by interior and outer including a conductor, an interior semi-conducting layer, a pottery polyolefin inner sheath, an outer semi-conducting layer and a shielding layer in proper order, the cable core with reach between the covering the armor inside all is equipped with inorganic mineral filling layer.

Preferably, the inorganic mineral filling layer between the cable core and the wrapping layer is an aluminum hydroxide filling layer, and a magnesium hydroxide filling layer is arranged inside the armor layer.

Preferably, the radiating layer is close to one side of the wrapping layer and is provided with a predetermined number of radiating grooves along the circumferential direction, and the length direction of the radiating grooves is parallel to the length direction of the conductor.

Preferably, the armor layer is a double-layer steel tape armor layer.

Preferably, the inner semiconductive layer and the outer semiconductive layer are both crosslinked polyethylene semiconductive layers.

Preferably, the shielding layer is an oxygen-free copper mesh shielding layer.

Preferably, the mineral fireproof cable comprises 4 power cable cores.

Preferably, the conductor is an oxygen-free copper conductor and is formed by stranding a plurality of strands of fine copper wires.

The utility model aims to provide a mineral fireproof cable, the mineral fireproof cable comprises a ceramic polyolefin outer sheath, an armor layer, a heat dissipation layer, a wrapping layer and a cable core with a predetermined amount in proper order from outside to inside, the ceramic polyolefin outer sheath can rapidly generate a complete ceramic shell under the temperature of more than 650 ℃ or the flame condition, the bending strength can reach 10MPa, the generated ceramic shell does not crack and drip, the ceramic shell has excellent electrical isolation performance and excellent oxygen isolation and heat insulation effects, can effectively isolate the infringement of high-temperature flame to internal materials, delay the decomposition of the internal materials, avoid the copper conductors from fusing in flame, jointly prevent the high-temperature flame from damaging the internal cable core with the armor layer, ensure the smoothness of a circuit under the fire disaster condition, the wrapping layer and the cable core are provided with a mineral filling layer, the heat dissipation layer is in the cable is favorable to reducing when normally working the inside temperature of mineral fireproof cable then is favorable to exporting the steam that mineral layer decomposes and generates when meeting with the condition of a fire, reduces the inside temperature of mineral fireproof cable delays the destruction of outside high temperature to inside cable core, just the cable core adopts the pottery polyolefin inner sheath is as the insulation of cable core, pottery polyolefin inner sheath still can guarantee when external structure became invalid the cable core moves a period, provides valuable time for rescue work, in addition the armor can do mineral fireproof cable provides good mechanical properties.

Drawings

Fig. 1 is a schematic structural diagram of a mineral fireproof cable provided by an embodiment of the present invention.

In the figure: 1-ceramic polyolefin outer sheath layer, 2-armor layer, 21-magnesium hydroxide filling layer, 3-heat dissipation layer, 31-heat dissipation groove, 4-lapping layer, 5-cable core, 51-conductor, 52-inner semi-conductive layer, 53-ceramic polyolefin inner sheath, 54-outer semi-conductive layer, 55-shielding layer and 6-aluminum hydroxide filling layer.

Detailed Description

The embodiments described below are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Referring to fig. 1, the present embodiment provides a mineral fireproof cable, which sequentially includes, from inside to outside, the predetermined number of cable cores 5, a wrapping layer 4, a heat dissipation layer 3, an armor layer 2, and a ceramic polyolefin outer sheath layer 1.

Each cable core 5 sequentially comprises a conductor 51, an inner semi-conducting layer 52, a ceramic polyolefin inner sheath 53, an outer semi-conducting layer 54 and a shielding layer 55 from inside to outside, wherein the conductor 51 is an oxygen-free copper conductor formed by stranding a plurality of strands of fine copper wires, the melting point of the copper conductor is 1083 ℃, and the damage of flames can be effectively prevented. The inner semi-conducting layer 52 and the outer semi-conducting layer 54 are both cross-linked polyethylene semi-conducting layers, so that the ceramic polyolefin inner sheath can be effectively prevented from being broken down by conductor discharge, and the ceramic polyolefin inner sheath 53 can rapidly generate a complete ceramic shell at the temperature of more than 650 ℃ or under the flame condition, the bending strength can reach 10MPa, the generated ceramic shell does not crack or drip, and the ceramic shell has excellent electrical isolation performance and excellent oxygen insulation and heat insulation effects, so that the infringement of high-temperature flame to a cable core can be effectively isolated, the decomposition of internal materials is delayed, and the copper conductor is prevented from being fused in flame. And the processing mode of the ceramic polyolefin is completely the same as that of the common polymer insulation, the ceramic polyolefin is directly extruded on a plastic molding machine, the production efficiency is high, the production cost is lower than that of a conventionally used mica tape wrapped fire-resistant cable under the condition that other conditions of the cable are not changed, and the cost advantage is more obvious on the fire-resistant cable with small specification.

An inorganic mineral filling layer is arranged between the cable core 5 and the wrapping layer 4, an aluminum hydroxide filling layer 6 is arranged between the cable core and the wrapping layer 4 in the embodiment, the aluminum hydroxide filling layer 6 is an inorganic compound taking aluminum hydroxide as a main material, the aluminum hydroxide is decomposed at 200 ℃ to release crystal water, the aluminum hydroxide absorbs heat when the crystal water is generated by decomposition, and the effects of temperature reduction and heat insulation can be achieved,

heat dissipation layer 3 is low smoke and zero halogen polyolefin heat dissipation layer, heat dissipation layer 3 is provided with predetermined number's radiating groove 31 along its circumference, radiating groove 31's length direction with copper conductor 51 length direction is parallel, permeates when the vapor that aluminium hydroxide generated in radiating groove 31 of predetermined number that heat dissipation layer 3 set up, and the heat can be taken away to vapor, and follows the heat mineral fireproof cable both ends are taken away, and the vapor is destroyed the back at heat dissipation layer 3 then can dilute combustible gas, plays fire-retardant effect, absorbs harmful gas and smoke and dust granule.

The armor layer 2 is arranged between the ceramic polyolefin outer sheath 1 and the heat dissipation layer 3, in the embodiment, the armor layer 2 is a double-layer steel tape armor layer, a magnesium hydroxide filling layer 21 is arranged between the double-layer steel tape armor layer, the magnesium hydroxide filling layer 21 is an inorganic compound taking magnesium hydroxide as a main raw material, the magnesium hydroxide starts to decompose and release crystal water when the temperature reaches 350 ℃, the crystal water can be changed into water vapor to absorb harmful gas and smoke particles under the high-temperature condition, another product obtained after the magnesium hydroxide is decomposed is magnesium oxide, and the magnesium oxide is sintered into solid magnesium oxide to achieve the purpose of fire prevention.

The ceramic polyolefin outer sheath 1 can rapidly generate a complete ceramic shell at the temperature of above 650 ℃ or under the flame condition due to the ceramic polyolefin, the generated ceramic shell does not crack or drip, and the ceramic polyolefin outer sheath has excellent electrical isolation performance and excellent oxygen and heat insulation effects, can be used as a barrier of the outermost layer of the mineral fireproof cable and protects the mineral fireproof cable from being damaged by high-temperature flame. And the ceramic polyolefin outer sheath 1, the low-smoke halogen-free polyolefin heat dissipation layer, the inner semi-conductive layer 52, the outer semi-conductive layer 54 and the ceramic polyolefin inner sheath 53 do not contain halogen, the toxicity of gas generated during combustion is low, the toxicity of a cable containing halogen released in fire is very high, for example, the toxicity index of polyvinyl chloride is 15.01, people can only survive for 2min in the smoke of polyvinyl chloride, the toxicity index of halogen-free polyolefin is 0.79, the survival time in the smoke of the halogen-free cable is prolonged to 40min, the escape probability of people in fire is greatly increased, and the risk of casualties caused by the fire in high-rise buildings and residential quarters is reduced.

In this embodiment, the shielding layer 55 is an oxygen-free copper mesh shielding layer.

In this embodiment, the mineral fireproof cable includes four cable cores 5, and the cable cores 5 are used for transmitting electric energy.

The embodiment provides a mineral fireproof cable, the mineral fireproof cable comprises a ceramic polyolefin outer sheath 1, an armor layer 2, a heat dissipation layer 3, a wrapping layer 4 and a predetermined number of cable cores 5 from the outside to the inside in sequence, the ceramic polyolefin outer sheath 1 can rapidly generate a complete ceramic shell under the temperature or flame condition of more than 650 ℃, the bending strength can reach 10MPa, the armor layer 2 and the high-temperature flame can jointly prevent the damage of the high-temperature flame to the inner cable core 5, a mineral filling layer is arranged between the wrapping layer 4 and the cable core 5, the heat dissipation layer 3 is favorable for reducing the temperature inside the mineral fireproof cable during normal work of the cable, is favorable for outputting water vapor generated by decomposition of a mineral layer when encountering fire, reduces the internal temperature of the mineral fireproof cable and delays the damage of external high temperature to the inner cable core, the ceramic polyolefin inner sheath 53 is used as insulation of the cable core 5, the ceramic polyolefin inner sheath 53 can still ensure that the cable core 5 runs for a period of time when an external structure fails, precious time is provided for rescue and emergency work, and the armor layer 2 can provide good mechanical performance for the mineral fireproof cable.

The above disclosure is only a preferred embodiment of the present invention, and certainly should not be taken as limiting the scope of the invention, which is defined by the claims and their equivalents.

Claims

1. The fireproof mineral cable comprises cable cores in a preset number and is characterized by comprising the cable cores in the preset number from inside to outside, a wrapping layer, a heat dissipation layer, an armor layer and a ceramic polyolefin outer sheath, wherein each cable core sequentially comprises a conductor, an inner semi-conducting layer, a ceramic polyolefin inner sheath, an outer semi-conducting layer and a shielding layer from inside to outside, and inorganic mineral filling layers are arranged between the cable cores and the wrapping layer and inside the armor layer.

2. The mineral fireproof cable of claim 1, wherein the inorganic mineral filler layer between the cable core and the wrapping layer is an aluminum hydroxide filler layer, and a magnesium hydroxide filler layer is arranged inside the armor layer.

3. The mineral fireproof cable of claim 1, wherein a predetermined number of heat dissipation grooves are circumferentially arranged on one side of the heat dissipation layer close to the wrapping layer, and the length direction of the heat dissipation grooves is parallel to the length direction of the conductor.

4. The mineral fireproof cable of claim 1, wherein the armor is a double steel tape armor.

5. The mineral fireproof cable of claim 1, wherein the inner and outer semiconductive layers are both crosslinked polyethylene semiconductive layers.

6. The mineral fire-resistant cable of claim 1, wherein the shielding layer is an oxygen-free copper mesh shielding layer.

7. The mineral fireproof cable of claim 1, wherein the mineral fireproof cable comprises 4 power cables.

8. The mineral fireproof cable of any one of claims 1 to 7, wherein the conductors are oxygen-free copper conductors stranded by fine copper wires.