CN209980838U

CN209980838U - Fireproof cable

Info

Publication number: CN209980838U
Application number: CN201921107714.7U
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 provides a pair of fireproof cable, the conductor has set up first flame retardant coating and second flame retardant coating outward, has played the effect of secondary fire prevention, has set up the waterproof layer in the middle of the flame retardant coating moreover for the cable has waterproof and fire behavior concurrently. The cable is filled with a glass fiber filler layer, so that the heat preservation, insulation, fire prevention and flame retardance of the conductor are realized. The cable heat dissipation structure comprises a first heat dissipation layer, a second heat dissipation layer and a wear-resistant high-temperature-resistant layer which are sequentially arranged from inside to outside, heat generated by the cable can be firstly transferred to the first heat dissipation layer through quick outward diffusion of the high-efficiency heat conduction effect of the heat conduction layer, and based on the special fiber net structure of the second heat dissipation layer and the characteristics of materials, the heat dissipation capacity can be well expanded, and final waste heat can be further diffused in the second heat dissipation layer to finish heat dissipation.

Description

Fireproof cable

Technical Field

The utility model relates to a wire and cable technical field especially relates to a fireproof cable.

Background

In recent years, in order to improve the safety level of an electric line and reduce the occurrence and loss of electric fire accidents, the national ministry of construction, the public security department and some local governments have successively issued some electric design specifications and clearly stipulate that fireproof cables must be adopted in some important electric lines and places, thereby further widening the application range of the fireproof cables.

The traditional magnesium oxide insulation fireproof cable is gradually eliminated, the flexible mineral composite insulation fireproof cable is high in price although the fireproof performance is good, and the common fireproof cable is only provided with one fireproof insulation layer, so that the fireproof efficiency is limited. Moreover, when the ordinary fireproof cable is used for a long time, a certain amount of heat can be generated, and due to the fact that no heat dissipation mechanism is arranged, after the ordinary fireproof cable is used for a long time, not only can the transmission efficiency of cable information be influenced, but also fire disasters can possibly occur.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a fire prevention cable that definition height, anti-electromagnetic interference of transmission signal are strong and have stable characteristic impedance etc..

A fireproof cable comprises a central conductor, a fireproof mechanism and a heat dissipation mechanism; the central conductors comprise a preset number of conductors, and the conductors are sequentially coated with a first insulating layer and a first fire-resistant layer; the fire-proof mechanism comprises a second insulating layer, an oxygen-isolating layer, a second fire-resistant layer and a heat-conducting layer which are sequentially arranged outside the central conductor; the heat dissipation mechanism is detachably coated outside the heat conduction layer and comprises a first heat dissipation layer, a second heat dissipation layer and a wear-resistant and high-temperature-resistant layer which are sequentially arranged from inside to outside.

Preferably, the gap in the second insulating layer is filled with a glass fiber filler layer.

Preferably, a waterproof layer is further arranged outside the conductor, and the waterproof layer is coated on the first fireproof layer.

Preferably, the first fire-resistant layer and the waterproof layer are coated on the conductor in a double-layer co-extrusion mode.

Preferably, a fluorescent layer is further arranged outside the wear-resistant and high-temperature-resistant layer.

Preferably, the heat dissipation mechanism is enclosed by a pair of semi-cylindrical shells, the joints of the semi-cylindrical shells are connected by fixing bolts, the two ends of the heat dissipation mechanism are open, and the openings are provided with detachable heat dissipation nets.

Preferably, the first insulating layer and the second insulating layer are both ceramic low-smoke halogen-free polyolefin material insulating layers.

Preferably, the first fire-resistant layer and the second fire-resistant layer are both mixed coatings of carbon fiber and high-temperature ceramic cement, and the thickness of the first fire-resistant layer and the second fire-resistant layer is 1-5 mm.

Preferably, the heat conducting layer is a polyvinylidene fluoride/crystalline flake graphite/carbon fiber composite material layer.

Preferably, the first heat dissipation layer is a double-layer plant fiber layer, the second heat dissipation layer is a metal mesh frame layer, and the metal mesh frame layer is a metal mesh frame layer capable of elastically deforming to a certain degree.

Compared with the prior art, the utility model discloses following beneficial effect has: the utility model provides a fireproof cable, the conductor has set up first flame retardant coating and second flame retardant coating altogether two-layer flame retardant coating outward, has played the effect of secondary fire prevention, has set up the waterproof layer in the middle of the flame retardant coating moreover for the cable has waterproof and fire behavior concurrently. The cable is filled with a glass fiber filler layer, so that the heat insulation, fire prevention and flame retardance of the conductor are realized, and the glass fiber does not generate harmful substances polluting the environment after being melted at high temperature. The cable heat dissipation structure comprises a first heat dissipation layer, a second heat dissipation layer and a wear-resistant high-temperature-resistant layer which are sequentially arranged from inside to outside, heat generated by the cable can be firstly quickly diffused and transferred to the first heat dissipation layer through the high-efficiency heat conduction effect of the heat conduction layer, and based on the special fiber net-shaped structure and material characteristics of the second heat dissipation layer, the heat dissipation capacity can be well expanded, and final waste heat can be further diffused in the net-shaped space channel of the second heat dissipation layer to finish heat dissipation. The cable is more wear-resistant due to the arrangement of the wear-resistant and high-temperature-resistant layer, the cable is convenient to transport and drag, the fireproof performance of the cable is further improved, and the service life of the cable is prolonged. The wear-resisting high temperature resistant layer cooperates the special fiber network structure and the characteristic of material on second heat dissipation layer, and the elastic deformation performance through second heat dissipation layer has overcome the problem that receives steel band or wire net constraint, and is crooked more easily, and is more convenient when having the position of buckling and laying wire and cable, has reduced the use amount of metal, the cost is reduced. Meanwhile, due to the fluorescent layer, the cable can be seen clearly when constructors construct the cable at night, and construction is facilitated.

Drawings

Fig. 1 is a schematic view of a fireproof cable structure provided by the present invention;

fig. 2 is the utility model provides a fireproof cable structure stereogram.

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, a fireproof cable includes a central conductor 1, a fireproof mechanism 2 and a heat dissipation mechanism 3.

The central conductor comprises a predetermined number of conductors 11, in this embodiment, the conductors 11 comprise four, and each conductor 11 is sequentially coated with a first insulating layer 12 and a first refractory layer 13. The first insulating layer 12 insulates the four conductors 11 from each other to prevent short-circuiting, and the first flame retardant coating 13 provides a guarantee for preventing the first insulating layer 12 from firing. The gap between the four conductors 11 and the outside of the first insulating layer 12 and the first fireproof layer 13 is filled with a glass fiber filler layer 14, the glass fiber filler is used as a material, so that the heat preservation, insulation, fire prevention and flame retardance of the conductors 11 can be realized, harmful substances polluting the environment cannot be generated after the glass fiber filler is melted at high temperature, the mechanical strength of a second insulating layer 21 arranged outside the central conductor 1 can be well increased, and the situation that a user breaks the first insulating layer 12 and the first fireproof layer 13 outside the conductors 11 due to bending when using the fire disaster caused by short circuit between the four conductors 11 is avoided.

The fire-proof mechanism 2 includes a second insulating layer 21, an oxygen-isolating layer 22, a second fire-resistant layer 23 and a heat-conducting layer 24, which are sequentially disposed outside the central conductor 1. The second insulating layer 21 and the second fire-resistant layer 23 are arranged to further enhance the insulation, fire resistance and fire resistance of the cable. The establishment of the oxygen isolation layer 22 strengthens the isolation of external oxygen, improves the transmission rate of the cable, and simultaneously isolates the external oxygen if the cable burns, so that the central conductor 1 cannot burn. The heat conducting layer 24 is a polyvinylidene fluoride/crystalline flake graphite/carbon fiber composite material layer and has a high-efficiency heat conducting effect.

The heat dissipation mechanism 3 is detachably coated outside the heat conduction layer 24, and the detachable design enables the cable to be maintained more conveniently, so that the maintenance cost is reduced. It comprises a first heat dissipation layer 31, a second heat dissipation layer 32 and a wear-resistant and high-temperature-resistant layer 33 which are sequentially arranged from inside to outside. The first heat dissipation layer 31 is a double-layer plant fiber layer, and has excellent external force resistance while having a heat dissipation effect, so that the stability of the cable is ensured. The second heat dissipation layer 32 is a metal mesh frame layer 32, wherein the metal mesh frame layer 32 is a metal mesh frame layer capable of elastically deforming to a certain degree. The heat generated by the cable can be firstly transferred to the first heat dissipation layer 31 through the high-efficiency heat conduction effect of the heat conduction layer 24 and the rapid outward diffusion, and based on the special fiber mesh structure and material characteristics of the second heat dissipation layer 32, the heat can be well diffused, and the final waste heat can be further diffused in the mesh space channel of the second heat dissipation layer 32 to complete heat dissipation.

The cable is more wear-resistant due to the arrangement of the wear-resistant high-temperature-resistant layer 33, the cable is convenient to transport and drag, meanwhile, the fireproof performance of the cable is further improved, and the service life of the cable is prolonged. The wear-resisting high temperature resistant layer 33 cooperates the special fiber network structure and the characteristic of material of second heat dissipation layer 32, has overcome the problem that receives steel band or wire net constraint through the elastic deformation performance of second heat dissipation layer 32, and is crooked more easily, and is more convenient when having the position of buckling and laying wire and cable, has reduced the use amount of metal, the cost is reduced.

The heat dissipation mechanism 3 is enclosed by two semi-cylindrical shells, two ends of the heat dissipation mechanism 3 are open, the central conductor 1 coated with the fireproof mechanism 2 penetrates through the openings, and a detachable heat dissipation net 35 is arranged at the opening. The connection positions of the semi-cylindrical shells are connected through fixing bolts 36, grooves 37 convenient for the fixing bolts 36 to use are formed in the edges of the two semi-cylindrical shells, and the fixing bolts 36 are hidden in the grooves 37. The heat dissipation mechanism 3 can protect the internal cables, and the heat dissipation nets 35 at both ends thereof can also be used for heat dissipation.

Preferably, a waterproof layer 15 is further disposed outside the conductor 11, and the waterproof layer 15 is coated on the first fire-resistant layer 13. After the wear-resistant high temperature-resistant layer 33 is damaged, the further waterproofing of the cable can be realized through the waterproof layer 15, and the service life of the cable is prolonged. In this embodiment, the first flame retardant coating 13 and the waterproof layer 15 are preferably coated on the conductor 11 in a double-layer co-extrusion manner, so that the extrusion coating process can be reduced, the production cost can be reduced, and meanwhile, the first flame retardant coating 13 and the waterproof layer 15 are better attached together, and the respective performances can be further improved.

The wear-resistant and high-temperature-resistant layer 33 is also provided with a fluorescent layer 34, so that construction personnel can easily see the cable in the construction at night, and the construction is convenient.

In this embodiment, the first insulating layer 12 and the second insulating layer 21 are ceramic low smoke zero halogen polyolefin insulating layers. Under the temperature or flame condition of more than 650 ℃, the ceramic low-smoke halogen-free polyolefin insulating layer can rapidly generate a complete ceramic-shaped shell, the generated ceramic-shaped shell is not cracked and dripped, the ceramic-shaped shell has excellent heat insulation and oxygen isolation effects, the infringement of high-temperature flame to the inside of a circuit can be effectively isolated, the decomposition of internal materials is delayed, the conductor 11 is prevented from being fused in flame, and the smoothness of the circuit under the fire disaster condition is ensured.

The first fire-resistant layer 13 and the second fire-resistant layer 23 are both mixed coatings of carbon fiber and high-temperature ceramic glue, and the thickness of the mixed coatings is 1-5mm, in the embodiment, the thickness of the mixed coatings is 4 mm. The carbon fiber can resist the high temperature of more than 3000 ℃ without contacting air and oxidant, has outstanding heat resistance, and compared with other materials, the strength of the carbon fiber begins to be reduced when the temperature is higher than 1500 ℃, and the higher the temperature is, the stronger the fiber is.

The utility model provides a fireproof cable possesses good fire prevention and water-proof effects, is equipped with heat dissipation mechanism simultaneously for the performance of cable is more stable, sets up the fluorescent layer, makes constructor see the cable easily in the construction of evening, thereby makes things convenient for the construction.

The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not intended to limit the scope of the invention, which is defined by the appended claims.

Claims

1. A fire-resistant cable, characterized in that: it includes a central conductor, a fire-proof mechanism and a heat-dissipating mechanism;

the central conductors comprise a preset number of conductors, and the conductors are sequentially coated with a first insulating layer and a first fire-resistant layer;

the fire-proof mechanism comprises a second insulating layer, an oxygen-isolating layer, a second fire-resistant layer and a heat-conducting layer which are sequentially arranged outside the central conductor;

the heat dissipation mechanism is detachably coated outside the heat conduction layer and comprises a first heat dissipation layer, a second heat dissipation layer and a wear-resistant and high-temperature-resistant layer which are sequentially arranged from inside to outside.

2. A fire-resistant cable according to claim 1, wherein the gap in said second insulating layer is filled with a glass fiber filler layer.

3. The fireproof cable of claim 1, wherein the conductor is further provided with a waterproof layer, and the waterproof layer is coated on the first fire-resistant layer.

4. The fireproof cable according to claim 3, wherein the first fire-resistant layer and the waterproof layer are coated on the conductor in a double-layer co-extrusion manner.

5. A fire-resistant cable in accordance with claim 1, wherein said abrasion and temperature resistant layer is further provided with a fluorescent layer.

6. The fireproof cable according to claim 1, wherein the heat dissipation mechanism is defined by a pair of semi-cylindrical shells, the joints of the semi-cylindrical shells are connected by fixing bolts, and two ends of the heat dissipation mechanism are open, and a detachable heat dissipation net is arranged at the opening.

7. A fire-resistant cable in accordance with claim 1, wherein said first insulating layer and said second insulating layer are both ceramic low smoke zero halogen polyolefin material insulating layers.

8. A fire-resistant cable according to claim 1, wherein said first fire-resistant layer and said second fire-resistant layer are both a mixed coating of carbon fiber and high temperature ceramic glue, and have a thickness of 1-5 mm.

9. A fire-resistant cable according to claim 1, wherein said heat conductive layer is a polyvinylidene fluoride/flake graphite/carbon fiber composite layer.

10. The fireproof cable of claim 1, wherein the first heat dissipation layer is a double-layer plant fiber layer, and the second heat dissipation layer is a metal mesh frame layer, wherein the metal mesh frame layer is a metal mesh frame layer capable of elastic deformation to a certain degree.