CN216212482U

CN216212482U - Low-voltage fire-resistant cable

Info

Publication number: CN216212482U
Application number: CN202121672503.5U
Authority: CN
Inventors: 冯浩楠; 石梁; 陈华; 刘亚; 袁斌; 陶庭芝
Original assignee: Hubei Baotong Electric Co ltd
Current assignee: Hubei Baotong Electric Co ltd
Priority date: 2021-07-22
Filing date: 2021-07-22
Publication date: 2022-04-05
Anticipated expiration: 2031-07-22

Abstract

The utility model discloses a low-voltage fire-resistant cable, which comprises a cable core, wherein the cable core consists of a conductor formed by drawing and twisting a plurality of copper rods and an insulating layer wrapped on the outer surface of the conductor, 5 cable cores are cabled according to a certain pitch, a halogen-free low-smoke tape is wrapped on the outer side of the cable core in a winding manner, the halogen-free low-smoke tape is wrapped according to 15% -20%, the outer surface of the halogen-free low-smoke tape is provided with a damp-proof layer, the outer surface of the damp-proof layer is provided with a bulge, the outer surface of the damp-proof layer is wrapped with a fire-resistant layer, the fire-resistant layer is made of fire clay, the outer surface of the fire-resistant layer is wrapped with a silica gel tape, the outer surface of the silica gel tape is wrapped with a glass fiber tape, the outer surface of the glass fiber tape is wrapped with an outer sheath, the fire clay is used for replacing a TPU material on the fire-resistant layer, the fire clay can isolate flame, can be continuously used in an external strong fire environment, and compared with the TPU material, the fire-resistant clay has excellent flame-resistant performance, meets the national standard A-type flame-retardant test, and has reliable safety.

Description

Low-voltage fire-resistant cable

Technical Field

The utility model relates to the field of power cables, in particular to a low-voltage fire-resistant cable.

Background

Fire-resistant cable means a cable that can be kept in operation safely for a certain period of time in the event of a flame burn. Fire-resistant cables are widely used in places related to fire safety and fire life saving, such as high-rise buildings, underground railways, underground streets, large power stations, and important industrial and mining enterprises, for example, power supply lines and control lines of emergency facilities such as fire-fighting equipment and emergency guide lamps.

In the prior art, the fire-resistant structure of most low-voltage fire-resistant flame-retardant cables is that mica tapes are used for wrapping conductors, but the structure can easily cause the scattering of the mica tapes and has potential safety hazards; TPU materials are adopted for insulation to pass a B1-grade flame retardant test, but the TPU materials are expensive and have high production difficulty.

Therefore, it is desirable to provide a cable which is relatively inexpensive and has excellent flame retardant properties.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the problems that the mica tape of the traditional low-voltage fire-resistant cable proposed in the background art is easy to scatter and has potential safety hazards, the TPU material is high in price and production difficulty, and a cable with relatively low price and excellent fire-resistant and flame-retardant properties is needed

In order to achieve the purpose, the utility model provides the following technical scheme: the utility model provides a low pressure fire resisting cable, includes the cable core, the cable core comprises the insulating layer of conductor and conductor outer surface parcel that many copper pole wire drawing and transposition formed, 5 the cable core according to certain pitch stranding, outside winding parcel has no steamed low smoke area, there is not steamed low smoke area according to 15% -20% around the package, the surface in steamed low smoke area is equipped with the dampproof course, the surface of dampproof course is provided with the arch, the surface parcel of dampproof course has the flame retardant coating, the flame retardant coating is the fire clay, and the surface winding of flame retardant coating has the silica gel area, the surface winding in silica gel area has glass fiber area, the surface parcel in glass fiber area has the oversheath.

Preferably, the gaps between the 5 cable cores and between the cable core and the halogen-free low-smoke belt are filled with the flame-retardant filling ropes, the flame-retardant filling ropes are selected as the innermost fireproof layers, the effect of protecting the cable conductor by the last layer is achieved, flame is isolated, heat is absorbed, and the service life of the power cable is prolonged.

Preferably, the silica gel has 4 layers, and the fire-resistant layer is wrapped in an overlapping wrapping mode, so that the fire-resistant and flame-retardant performance is further improved by using a fire-resistant inorganic fiber material.

Preferably, the glass fiber has 2 layers, and silica gel tape is wrapped in an overlapping wrapping mode, so that the fireproof flame retardant property is further improved by adopting a fireproof inorganic fiber material.

The insulating layer adopts crosslinked polyethylene, the dampproof course adopts linear low density polyolefin, the oversheath adopts fire-retardant low smoke and zero halogen A level polyolefin, chooses for use low smoke and zero halogen material in order to improve flame retardant efficiency.

Compared with the prior art, the utility model has the advantages that:

(1) the fire clay is used for replacing a TPU material on the fire-resistant layer, so that the fire clay is good in bending performance, light in weight and convenient to install and use, can isolate flame, can be continuously used in an external big fire environment, is low in price and excellent in flame retardant property compared with the TPU material, meets the national standard A-class flame retardant test, and is reliable in safety.

(2) Through using the dampproof course, inside preventing the steam infiltration cable core of flame retardant clay, set up the frictional force of protruding increase dampproof course and flame retardant clay above the dampproof course, prevent that the flame retardant clay from droing, overlap in proper order at the flame retardant coating surface around package silica gel area and glass fiber tape, further improve fire-resistant flame retardant efficiency in the time of fixed flame retardant clay.

Drawings

FIG. 1 is a schematic cross-sectional view of the present invention;

FIG. 2 is a schematic view of the structure of the refractory of the present invention;

in the figure: 1. a cable core; 11. a conductor; 12. an insulating layer; 3. a flame retardant filler rope; 4. a moisture barrier; 41. a protrusion; 5. a refractory layer; 6. a silica gel band; 7. a glass fiber tape; 8. an outer sheath.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-2, an embodiment of the present invention is shown: the utility model provides a low pressure fire resisting cable, including cable core 1, cable core 1 comprises conductor 11 and the insulating layer 12 of conductor 11 surface parcel that many copper pole wire drawing and transposition formed, insulating layer 12 adopts crosslinked polyethylene, 5 cable cores 1 are according to certain pitch stranding, outside winding parcel has no steamed low smoke area 2, there is not steamed low smoke area 2 according to 15% -20% around the package, space department space packing has fire-retardant packing rope 3, the surface uses no steamed low smoke area, the fire resistance is strengthened greatly, and there is not steamed low smoke area to be the mica layer obscission that the mica tape can not appear in the weaving material, choose fire-retardant packing rope as innermost flame retardant coating for use, play the effect of last layer protection cable conductor, isolated flame, absorb the heat, power cable's life has been prolonged.

It is equipped with dampproof course 4 to have no steamed low smoke zone 2's surface, dampproof course 4 adopts linear low density polyolefin, the surface of dampproof course 4 is provided with protruding 41, the aim at of dampproof course 4 prevents inside the steam infiltration cable core of flame retardant clay, it can increase the frictional force of dampproof course 4 and flame retardant clay to set up protruding 41 on dampproof course 4, prevent that the flame retardant clay from droing, the surface coating of dampproof course 4 has flame retardant coating 5, flame retardant coating 5 is the flame retardant clay, replace the TPU material through using the flame retardant clay at flame retardant coating 5, its bending property is better, light in weight, be convenient for install and use, the flame retardant clay can completely cut off flame, can continuously use under the external big fire environment, compare the TPU material, the flame retardant clay low price flame retardant property is outstanding, satisfy national standard A class flame retardant test, the security is reliable.

The surface winding of flame retardant coating 5 has silica gel area 6, silica gel area 6 has 4 layers, adopt the overlapping mode parcel flame retardant coating 5 around the package, the surface winding of silica gel area 6 has glass fiber tape 7, glass fiber tape 7 has 2 layers, adopt the overlapping mode parcel silica gel area 6 around the package, overlap in proper order at 5 surfaces of flame retardant coating around package silica gel area 6 and glass fiber tape 7, further improve fire-resistant flame retardant efficiency in the fixed fire clay, the surface parcel of glass fiber tape 7 has oversheath 8, oversheath 8 adopts fire-retardant low smoke zero halogen A level polyolefin.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and equivalent alternatives or modifications according to the technical solution of the present invention and the inventive concept thereof should be covered by the scope of the present invention.

Claims

1. A low voltage fire resistant cable characterized by: including cable core (1), cable core (1) comprises insulating layer (12) of conductor (11) and conductor (11) surface parcel that many copper pole wire drawing and transposition formed, 5 cable core (1) according to certain pitch stranding, outside winding parcel has no halogen low smoke area (2), and there is no halogen low smoke area (2) according to 15% -20% around the package, the surface of halogen-free low smoke area (2) is equipped with dampproof course (4), the surface of dampproof course (4) is provided with arch (41), the surface parcel of dampproof course (4) has flame retardant coating (5), flame retardant coating (5) are the fire clay, and the surface winding of flame retardant coating (5) has silica gel area (6), the surface winding of silica gel area (6) has glass fiber tape (7), the surface of glass fiber tape (7) has oversheath (8).

2. A low voltage fire resistant cable according to claim 1, wherein: gaps among the 5 cable cores (1) and between the cable cores (1) and the halogen-free low-smoke belt (2) are filled with flame-retardant filling ropes (3).

3. A low voltage fire resistant cable according to claim 1, wherein: silica gel area (6) have 4 layers, adopt to overlap to wrap up flame retardant coating (5) around the mode of package.

4. A low voltage fire resistant cable according to claim 1, wherein: the glass fiber tape (7) has 2 layers, and the silica gel tape (6) is wrapped in an overlapping wrapping mode.

5. A low voltage fire resistant cable according to claim 1, wherein: insulating layer (12) adopt crosslinked polyethylene, linear low density polyolefin is adopted in dampproof course (4), oversheath (8) adopt fire-retardant low smoke and zero halogen A level polyolefin.