CN109300604B

CN109300604B - Fireproof cable

Info

Publication number: CN109300604B
Application number: CN201811277178.5A
Authority: CN
Inventors: 李涵; 潘万胜
Original assignee: Guangdong Wanruitong Cable Industry Co Ltd
Current assignee: Guangdong Wanruitong Cable Industry Co ltd
Priority date: 2018-10-30
Filing date: 2018-10-30
Publication date: 2020-07-07
Anticipated expiration: 2038-10-30
Also published as: CN109300604A

Abstract

The invention belongs to the technical field of cable fire prevention, and particularly relates to a fireproof cable which comprises a tubular rubber flame-retardant layer as the outermost layer, three arc-shaped fireproof plates which are positioned in the rubber flame-retardant layer and arranged in a triangular manner, and three cable cores which are positioned in the middles of the three arc-shaped fireproof plates, wherein the three cable cores are arranged in a triangular manner, the arc-shaped fireproof plates are bent towards the rotation center direction of the rubber flame-retardant layer, the arc-shaped fireproof plates are arranged in a triangular manner and form a first cavity with the triangular interior, and each arc-shaped fireproof plate and the rubber flame-retardant layer are enclosed to form a second cavity; the second cavity is filled with water, and the first cavity is filled with mixed sand and cement; the cable core is protected by the rubber flame-retardant layer and the arc-shaped fireproof plate; sand and cement through in the first cavity meet the water and solidify, have realized protecting fireproof cable once more, avoid fireproof cable to be lighted the back electric leakage or cut off the power supply and cause great loss.

Description

Fireproof cable

Technical Field

The invention belongs to the technical field of cable fire prevention, and particularly relates to a fire-proof cable.

Background

Along with the development of society, the fire prevention of high-rise buildings and important buildings is more and more emphasized by people, in order to improve the fire safety level, a flame-retardant cable or a fire-resistant cable is generally adopted, and a magnesium oxide insulation fire-proof cable is selected for buildings with higher requirements, such as large-scale museum houses. The fire-resistant cable is formed by wrapping a layer of fire-resistant mica tape on a conductor of the cable, so that the cable can still supply power for a period of time under the condition of fire, an elevator cannot be powered off immediately, and people can strive for a precious time for escaping, the time is short, and the fire-resistant cable can be broken down to lose the power transmission function; the insulation, sheath and filler materials used in such fire-resistant cables are combustible, and thus the cable itself is easily combustible.

Patent document 1: an inorganic material high flame retardant fireproof cable, application number: 2012103365944

In the patent document 1, the above document discloses an inorganic material high flame-retardant fireproof cable, which includes a plurality of cables, an inorganic material flame-retardant layer extruded on the plurality of cables, and a flame-retardant outer sleeve sleeved on the inorganic material flame-retardant layer, wherein each cable is composed of a copper conductor and a ceramic silicon rubber insulating layer extruded on the copper conductor; the inorganic material 1 refractory layer is formed by extruding the following raw materials in percentage by weight: magnesium hydroxide: 85%, serpentine powder: 6%, magnesium calcium carbonate: 4%, sodium silicate: 3%, chlorinated paraffin: 2 percent.

The fireproof cable realizes fire resistance by changing the ingredient components of the inorganic material fireproof layer and realizes ceramic material at high temperature, so that the cable is not easy to burn; but the self cooling effect of the fireproof cable is not obvious, and the fireproof cable generates heat seriously and is easy to age when encountering fire.

Disclosure of Invention

In order to make up for the defects of the prior art, the fireproof cable provided by the invention can relieve the temperature rise of the fireproof cable through self cooling and heat absorption, and can also strengthen flame retardance through forming concrete inside, so that the multilayer protection of the fireproof cable is realized.

The technical scheme adopted by the invention for solving the technical problems is as follows: the fireproof cable comprises a tubular rubber flame-retardant layer on the outermost layer, three arc-shaped fireproof plates which are positioned in the rubber flame-retardant layer and arranged in a triangular mode, and three cable cores which are positioned among the three arc-shaped fireproof plates, wherein the three cable cores are arranged in a triangular mode, the arc-shaped fireproof plates are bent towards the rotation center direction of the rubber flame-retardant layer, the arc-shaped fireproof plates are arranged in a triangular mode and form a first cavity with the triangular inner part, and each arc-shaped fireproof plate and the rubber flame-retardant layer are enclosed to form a second cavity; the second cavity is filled with water, and the first cavity is filled with mixed sand and cement; wherein the content of the first and second substances,

the arc-shaped fire-proof plate comprises a plurality of mutually meshed first plates which are continuously arranged; after two adjacent first plates are extruded by the rubber flame-retardant layer, the occlusion part between the two first plates automatically cracks. When the cable is in work, the rubber flame-retardant layer carries out first-layer protection on the cable core, and the arc-shaped fireproof plate carries out second-layer protection on the cable core; the water in the second cavity can absorb heat emitted by the cable core in the using process, so that the heat dissipation of the cable core is facilitated, the aging of the cable core can be slowed down, and the service life of the cable core is prolonged; when a fire disaster occurs, the rubber flame-retardant layer on the outer surface of the fireproof cable is burnt, and water in the second cavity can absorb heat on the rubber flame-retardant layer in an initial state, so that the burning deformation time of the rubber flame-retardant layer is prolonged, and the fire extinguishing time is won after the fire disaster occurs; after the fire-retardant layer of rubber is out of shape by the big fire firing, the fire-retardant layer of rubber will contract, water in the second cavity will be pressed, make the first board of mutual interlock appear the crack, water enters into in the first cavity from the crack department of first board, make sand and cement in the first cavity meet water and begin to solidify, under the continuous firing of big fire in the external world, make sand and cement in the first cavity solidify completely, the protection to the cable core has been realized, avoid the cable core to be lighted the back electric leakage and cause great loss.

A plurality of first water outlet holes are formed in the first plate; a first elastic film is attached to the orifice of the first water outlet; the first elastic film and the first plate are sealed in a spot-fixing mode through glue. During operation, breach on the first board is not big enough, when can't bear the pressure of second cavity internal water completely, and water will oppress first elastic film, makes first elastic film be expanded, and pressurized water will spray in sand and cement, has promoted the mixture of sand and cement, can make sand and cement better by the solidification, is favorable to improving the quality of the concrete that sand and cement formed after solidifying, makes the cable core receive better protection.

Retainers matched with the cable cores are arranged at the three cable cores; the retainer is positioned in a triangular area formed by the three cable cores; the retainer is provided with a first groove; the first groove is located at the contact position of the retainer and the cable core. When the cable holder works, the three cable cores can always keep the distance between the three cable cores, and the phenomenon that the adjacent cable cores are contacted and leaked to wipe out sparks to cause damage is avoided; the retainer is provided with the first groove, so that cement and sand can wrap the cable core, and after the cement and the sand are solidified to form concrete, the concrete wraps the cable core, so that the cable core is protected more comprehensively.

The sand is angular sand or smooth river sand. When the cable core is in operation, when the sand is in an angular shape, a plurality of cavities are formed in concrete formed by the sand and the cement, the cavities have the functions of heat insulation and heat preservation, the influence of the burning of the cable core by external fire is reduced, and the cable core is protected; when the sand is smooth river sand, after water flows into the second cavity, the flow of the sand and the cement is promoted, so that the sand and the cement are better mixed and solidified, the sand and the cement are favorably coagulated to form firmer concrete with better quality, and a cable core is better protected.

A hose is arranged in the center of the retainer; the hose is filled with water; a plurality of second water outlet holes are formed in the hose, and second elastic films are attached to orifices of the second water outlet holes; the second elastic film and the hole opening of the second water outlet hole are sealed in a spot-fixing mode through glue. When the concrete is in work, generally, after sand and cement are coagulated into concrete, water is needed to be wetted to strengthen the coagulation when the concrete is initially coagulated, otherwise, the concrete coagulated by the sand and the cement is not firm; therefore, set up the hose that is equipped with water at retainer central authorities, the water in the hose can absorb the concrete by the heat that the big fire firing had, water in the hose is heated the inflation and breaks away behind the second elastic film, water will be absorbed by the concrete, the concrete is cooled down, the concrete absorbs water once more, be favorable to the better solidification of concrete, the solidification quality of concrete has been improved, and then better protection the cable core, avoid the cable core to be burnt out by big fire and cause electric leakage or circuit by the possibility of cutting off, make cable core sustainable work.

A plurality of third cavities are uniformly distributed in the rubber flame-retardant layer; and a mixture of a methyl cellulose solution and a preservative is filled in the third cavity. When the fireproof cable works, the preservative is added into the methyl cellulose solution, so that the methyl cellulose can be prevented from being decomposed by microorganisms, and meanwhile, the heat dissipation effect of the fireproof cable can be enhanced under the cooling state of the methyl cellulose solution; when the conflagration breaing out, the fire-retardant layer of big fire firing rubber, methyl cellulose solution heat absorption, when the temperature reaches fifty to seventy degrees, methyl cellulose solution will solidify and form the colloid for the fire-proof thermal-insulated effect of the fire-retardant layer of rubber is better, is favorable to reducing the fire prevention cable and is damaged by big fire, and after the mixture cooling, methyl cellulose will become liquid again, continues to promote fire prevention cable's heat dissipation.

The invention has the following beneficial effects:

1. the cable core is protected by the first layer through the rubber flame-retardant layer, and protected by the second layer through the arc-shaped fireproof plate; the water in the second cavity can absorb heat emitted by the cable core in the using process, so that the heat dissipation of the cable core is facilitated, the aging of the cable core can be slowed down, and the service life of the cable core is prolonged; sand and cement through in the first cavity meet the water and solidify, have realized protecting fireproof cable once more, avoid fireproof cable to be lighted the back electric leakage or cut off the power supply and cause great loss.

2. According to the invention, the three cable cores are always kept at intervals by the retainer, so that the damage caused by the contact leakage and the spark of the adjacent cable cores is avoided; be provided with first groove in retainer department, can be so that cement and sand parcel cable core, after cement and sand solidify and form the concrete, the concrete has realized more comprehensive protection to the cable core with the cable core parcel.

3. According to the invention, the hose filled with water is arranged in the center of the holding frame, the water in the hose can absorb heat of the concrete burned by big fire, after the water in the hose expands by heating and rushes out the second elastic film, the water is absorbed by the concrete, the concrete is cooled, and the concrete absorbs water again, so that the concrete is better solidified, the solidification quality of the concrete is improved, the cable core is better protected, the possibility of electric leakage or circuit cut caused by burning out of the cable core by big fire is avoided, and the cable core can work continuously.

4. According to the invention, the methyl cellulose solution absorbs heat, when the temperature reaches fifty to seventy ℃, the methyl cellulose solution is solidified to form colloid, so that the fireproof and heat-insulating effects of the rubber flame-retardant layer are better, the fireproof cable is favorably prevented from being damaged by fire, after the mixture is cooled, the methyl cellulose is changed into liquid again, and the heat dissipation of the fireproof cable is continuously promoted.

Drawings

FIG. 1 is a schematic view of a fire-protected cable construction of the present invention;

FIG. 2 is an A-direction view of the first plate of FIG. 1;

in the figure: the fireproof cable comprises a rubber flame-retardant layer 1, a second cavity 11, a third cavity 12, an arc-shaped fireproof plate 2, a first plate 21, a first cavity 22, a first elastic film 23, a cable core 3, a retainer 4, a first groove 41, a hose 5 and a second elastic film 51.

Detailed Description

A fire-resistant cable according to the present invention will be described below with reference to fig. 1 to 2.

As shown in fig. 1 to 2, the fireproof cable of the present invention comprises a tubular rubber flame retardant layer 1 at the outermost layer, three arc-shaped fireproof plates 2 arranged in the rubber flame retardant layer 1 in a triangular manner, and three cable cores 3 arranged in the middle of the three arc-shaped fireproof plates 2, wherein the three cable cores 3 are arranged in a triangular manner, the arc-shaped fireproof plates 2 are bent toward the rotation center direction of the rubber flame retardant layer 1, the arc-shaped fireproof plates 2 are arranged in a triangular manner and form a first cavity 22 with a triangular interior, and each arc-shaped fireproof plate 2 and the rubber flame retardant layer 1 enclose to form a second cavity 11; the second cavity 11 is filled with water, and the first cavity 22 is filled with mixed sand and cement; wherein the content of the first and second substances,

the arc-shaped fire-proof plate 2 comprises a plurality of mutually engaged first plates 21 which are continuously arranged; after two adjacent first plates 21 are extruded by the rubber flame-retardant layer 1, the joint between the two first plates 21 automatically cracks. When the cable is in work, the rubber flame-retardant layer 1 carries out first-layer protection on the cable core 3, and the arc-shaped fireproof plate 2 carries out second-layer protection on the cable core 3; the water in the second cavity 11 can absorb heat emitted by the cable core 3 in the using process, so that the heat radiation of the cable core 3 is facilitated, the aging of the cable core 3 can be slowed down, and the service life of the cable core 3 is prolonged; when a fire disaster occurs, the rubber flame-retardant layer 1 on the outer surface of the fireproof cable is burnt, water in the second cavity 11 can absorb heat on the rubber flame-retardant layer 1 in an initial state, and the burning deformation time of the rubber flame-retardant layer 1 is prolonged, so that the fire extinguishing time is won after the fire disaster occurs; after the fire-retardant layer of rubber 1 is out of shape by the big fire ignition, the fire-retardant layer of rubber 1 will contract, water in the second cavity 11 will be pressurized, make the first board 21 of mutual interlock appear the crack, water enters into in first cavity 22 from the crack department of first board 21, make sand and cement in the first cavity 22 meet water and begin to solidify, under the continuous ignition of big fire of external world, make sand and cement in the first cavity 22 solidify completely, realized the protection to cable core 3, avoid cable core 3 to be lighted the back electric leakage and cause great loss.

A plurality of first water outlet holes are formed in the first plate 21; a first elastic film 23 is attached to the orifice of the first water outlet; the first elastic film 23 and the first plate 21 are sealed by glue. During operation, breach on first board 21 is not big enough, and when unable can bear the pressure of second cavity 11 internal water completely, water will oppress first elastic film 23, makes first elastic film 23 be expanded, and during having pressurized water will be sprayed sand and cement, promoted the mixture of sand and cement, can make sand and cement better by the solidification, be favorable to improving the quality of the concrete that sand and cement formed after solidifying, make cable core 3 receive better protection.

The three cable cores 3 are provided with holding frames 4 matched with the cable cores 3; the retainer 4 is positioned in a triangular area formed by the three cable cores 3; the holder 4 is provided with a first groove 41; the first groove 41 is located where the holder 4 contacts the cable core 3. When the cable connector works, the three cable cores 3 can always keep the distance by the retainer 4, and the phenomenon that the adjacent cable cores 3 are contacted with electricity leakage to wipe out sparks to cause damage is avoided; retainer 4 department is provided with first groove 41, can be so that cement and sand parcel cable core 3, and behind cement and sand solidification formation concrete, the concrete has realized more comprehensive protection to cable core 3 with cable core 3 parcel.

The sand is angular sand or smooth river sand. When the cable core is in operation, when the sand is in an angular shape, a plurality of cavities are formed in the concrete formed by the sand and the cement, the cavities have the functions of heat insulation and preservation, the influence of the burning of the cable core 3 by external fire is reduced, and the cable core 3 is protected; when the sand is smooth river sand, after water flows into the second cavity 11, the flow of the sand and the cement is promoted, so that the sand and the cement are better mixed and solidified, the sand and the cement are favorably coagulated to form firmer concrete with better quality, and the cable core 3 is better protected.

A hose 5 is arranged in the center of the retainer 4; the hose 5 is filled with water; a plurality of second water outlet holes are formed in the hose 5, and second elastic films 51 are attached to the orifices of the second water outlet holes; the second elastic film 51 and the hole of the second water outlet are sealed by glue. When the concrete is in work, generally, after sand and cement are coagulated into concrete, water is needed to be wetted to strengthen the coagulation when the concrete is initially coagulated, otherwise, the concrete coagulated by the sand and the cement is not firm; therefore, set up the hose 5 that is equipped with water in retainer 4 central authorities, the water in the hose 5 can absorb the concrete by the heat that the big fire firing had, water is heated the inflation and washes away second elastic film 51 back in hose 5, water will be absorbed by the concrete, the concrete is cooled down, the concrete absorbs water once more, be favorable to the better solidification of concrete, the solidification quality of concrete has been improved, and then better protection cable core 3, avoid cable core 3 to be burnt out by big fire and cause the electric leakage or the circuit to be cut off the possibility, make cable core 3 sustainable work.

A plurality of third cavities 12 are uniformly distributed in the rubber flame-retardant layer 1; the third cavity 12 is filled with a mixture of a methylcellulose solution and a preservative. When the fireproof cable works, the preservative is added into the methyl cellulose solution, so that the methyl cellulose can be prevented from being decomposed by microorganisms, and meanwhile, the heat dissipation effect of the fireproof cable can be enhanced under the cooling state of the methyl cellulose solution; when the conflagration breaing out, fire prevention layer 1 is fired to the fire hazard, and methyl cellulose solution absorbs the heat, and when the temperature reached fifty to seventy degrees, methyl cellulose solution will solidify and form the colloid for 1 fire prevention thermal-insulated effect on fire prevention layer of rubber is better, is favorable to reducing the fire protection cable and is damaged by the fire hazard, and after the mixture cooling, methyl cellulose will become liquid again, continues to promote fire protection cable's heat dissipation.

The specific working process is as follows:

when the cable is in work, the rubber flame-retardant layer 1 carries out first-layer protection on the cable core 3, and the arc-shaped fireproof plate 2 carries out second-layer protection on the cable core 3; the water in the second cavity 11 can absorb heat emitted by the cable core 3 in the using process, so that the heat radiation of the cable core 3 is facilitated, the aging of the cable core 3 can be slowed down, and the service life of the cable core 3 is prolonged; when a fire disaster occurs, the rubber flame-retardant layer 1 on the outer surface of the fireproof cable is burnt, water in the second cavity 11 can absorb heat on the rubber flame-retardant layer 1 in an initial state, and the burning deformation time of the rubber flame-retardant layer 1 is prolonged, so that the fire extinguishing time is won after the fire disaster occurs; the methyl cellulose solution in the rubber flame-retardant layer 1 absorbs heat on the rubber flame-retardant layer 1, and when the temperature reaches fifty to seventy ℃, the methyl cellulose solution is solidified to form colloid, so that the fireproof and heat-insulating effects of the rubber flame-retardant layer 1 are better; after the rubber flame-retardant layer 1 is burnt and deformed by a big fire, the rubber flame-retardant layer 1 shrinks, water in the second cavity 11 is pressed, so that the mutually meshed first plates 21 are cracked, the water enters the first cavity 22 from the cracks of the first plates 21, sand and cement in the first cavity 22 start to solidify when meeting water, and the sand and the cement in the first cavity 22 are completely solidified under the continuous burning of the external big fire, so that the protection of the cable core 3 is realized, and the heavy loss caused by electric leakage after the cable core 3 is burnt is avoided; when the crack on the first plate 21 is not large enough to completely bear the pressure of the water in the second cavity 11, the water presses the first elastic film 23, so that the first elastic film 23 is expanded, the pressurized water is sprayed into the sand and the cement, the mixing of the sand and the cement is promoted, the sand and the cement can be better solidified, the quality of the concrete formed after the sand and the cement are solidified is favorably improved, and the cable core 3 is better protected; after the water in the hose 5 is heated and expanded and rushes away the second elastic film 51, water will be absorbed by the concrete, and the concrete is cooled down, and the concrete absorbs water once more, is favorable to the better solidification of concrete, has improved the solidification quality of concrete, and then better protection cable core 3, avoid cable core 3 to be burnt out by big fire and cause electric leakage or circuit by the possibility of cutting off for cable core 3 sustainable work.

While one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the scope of the present invention.

Industrial applicability

According to the invention, the cable core is protected by a first layer through the rubber flame-retardant layer, and is protected by a second layer through the arc-shaped fireproof plate; the water in the second cavity can absorb heat emitted by the cable core in the using process, so that the heat dissipation of the cable core is facilitated, the aging of the cable core can be slowed down, and the service life of the cable core is prolonged; the sand and the cement in the first cavity are solidified when meeting water, so that the fireproof cable is protected again, and the major loss caused by electric leakage or power failure after the fireproof cable is burnt is avoided; the fire-resistant cable is therefore useful in the field of cable fire protection technology.

Claims

1. A fire-resistant cable, characterized in that: the cable core structure comprises a tubular rubber flame-retardant layer (1) as the outermost layer, three arc-shaped fireproof plates (2) which are positioned in the rubber flame-retardant layer (1) and arranged in a triangular mode and three cable cores (3) which are positioned in the middles of the three arc-shaped fireproof plates (2), wherein the three cable cores (3) are arranged in a triangular mode, the arc-shaped fireproof plates (2) are bent towards the direction of the rotation center of the rubber flame-retardant layer (1), the arc-shaped fireproof plates (2) are arranged in a triangular mode to form a first cavity (22) with the triangular interior, and each arc-shaped fireproof plate (2) and the rubber flame-retardant layer (1) are enclosed to form a second cavity (11); the second cavity (11) is filled with water, and the first cavity (22) is filled with mixed sand and cement; the arc-shaped fireproof plate (2) comprises a plurality of mutually meshed first plates (21) which are continuously arranged; after two adjacent first plates (21) are extruded by the rubber flame-retardant layer (1), the occlusion part between the two first plates (21) automatically cracks.

2. A fire-resistant cable according to claim 1, wherein: a plurality of first water outlet holes are formed in the first plate (21); a first elastic film (23) is attached to the orifice of the first water outlet; the first elastic film (23) and the first plate (21) are sealed through glue spot welding.

3. A fire-resistant cable according to claim 1, wherein: retainers (4) matched with the cable cores (3) are arranged at the three cable cores (3); the retainer (4) is positioned in a triangular area formed by the three cable cores (3); a first groove (41) is arranged on the retainer (4); the first groove (41) is positioned at the contact position of the retainer (4) and the cable core (3).

4. A fire-resistant cable according to claim 1, wherein: the sand is angular sand or smooth river sand.

5. A fire-resistant cable according to claim 3, wherein: a hose (5) is arranged in the center of the retainer (4); the hose (5) is filled with water; a plurality of second water outlet holes are formed in the hose (5), and second elastic films (51) are attached to the holes of the second water outlet holes; the second elastic film (51) and the hole opening of the second water outlet hole are sealed through glue in a spot-fixing mode.

6. A fire-resistant cable according to claim 1, wherein: a plurality of third cavities (12) are uniformly distributed in the rubber flame-retardant layer (1); and a mixture of a methyl cellulose solution and a preservative is filled in the third cavity (12).