CN216597039U - B1-grade fire-resistant cable for constructional engineering - Google Patents

Abstract

The utility model discloses a B1-grade fire-resistant cable for constructional engineering, which comprises a belting layer arranged outside a cable core and a comprehensive sheath extruded outside the belting layer, wherein the cable core consists of a pressure-resistant support core and four insulating leads embedded in the cambered surface of the pressure-resistant support core, each insulating lead consists of a conductor, a fire-resistant layer coaxially wrapped outside the conductor and an extruded insulating layer, the cable core also comprises a filler extruded between the pressure-resistant support core and the insulating leads, the belting layer is wrapped outside the pressure-resistant support core, and fire-resistant oxygen-isolating mineral filler is extruded among the pressure-resistant support core, the belting layer and the cable core. The utility model aims at solving the problems of poor impact resistance, insufficient protection of the cable inner wire core and the like of the fire-resistant cable in the prior art, and has the advantages of excellent impact resistance, capability of protecting the cable inner wire core, prolonged service life of the cable, potential safety hazard reduction and the like.

Description

B1-grade fire-resistant cable for constructional engineering

Technical Field

The utility model relates to the technical field of fire-resistant cables, in particular to a B1-grade fire-resistant cable for constructional engineering.

Background

The fire-resistant cable is a cable capable of keeping safe operation for a certain time under the condition of flame combustion, and is widely applied to places related to fire safety and fire-fighting lifesaving, such as high-rise buildings, underground railways, underground streets, large-scale power stations, important industrial and mining enterprises and the like, for example, power supply lines and control lines of emergency facilities such as fire-fighting equipment, emergency guide lamps and the like.

At present, the existing fire-resistant cables on the market have poor impact resistance, the protection on cable inner wire cores is insufficient, the service life of the cable is short, and great potential safety hazards exist.

Aiming at the technical problems, the utility model discloses a B1-grade fire-resistant cable for constructional engineering, which has the advantages of excellent shock resistance, capability of protecting a wire core in the cable, prolonged service life of the cable, reduction of potential safety hazards and the like.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the prior art, and provides a B1-grade fire-resistant cable for constructional engineering, so as to solve the problems that the fire-resistant cable on the market in the prior art is poor in impact resistance, insufficient in protection of an inner wire core of the cable, short in service life and great in potential safety hazard. The cable has the advantages of excellent shock resistance, capability of protecting the inner wire core of the cable, prolonged service life of the cable, reduction of potential safety hazards and the like.

The utility model is realized by the following technical scheme: the utility model discloses a B1-grade fire-resistant cable for constructional engineering, which comprises a belting layer arranged outside a cable core and a comprehensive sheath extruded outside the belting layer, wherein the cable core consists of a compression-resistant support core and four insulated wires embedded in the cambered surface of the compression-resistant support core, each insulated wire consists of a conductor, a fire-resistant layer coaxially wrapped outside the conductor and an extruded insulating layer, the cable core also comprises a filler extruded between the compression-resistant support core and the insulated wires, the belting layer is wrapped outside the compression-resistant support core, and fire-resistant oxygen-isolating mineral filling is extruded among the compression-resistant support core, the belting layer and the cable core; the comprehensive sheath is composed of a flame-retardant polyvinyl chloride inner liner layer, a galvanized steel strip armor layer and a flame-retardant polyolefin outer sheath which are coaxially and sequentially extruded outside the wrapping layer.

Further, in order to guarantee sinle silk circularity, realize the protective effect to the cable core, the resistance to compression support core includes the core strip and fixes the resistance to compression support bar at the core strip outer wall along the axle center, and resistance to compression support bar longitudinal section is fan-shaped structure.

Furthermore, in order to improve the self-protection effect of the cable core, the fire-resistant layer is a mica tape, the insulating layer is made of crosslinked polyethylene, and the filler is an alkali-free glass fiber rope.

Furthermore, in order to increase the fire-resistant and oxygen-insulating effects of the cable, the mineral is filled with fire-resistant clay.

Furthermore, in order to further improve the tensile strength and the elastic coefficient of the cable and enable the cable to bear larger impact energy, the wrapping tape layer is a glass fiber tape wrapping layer.

The utility model has the following advantages:

(1) according to the cable core, the compression-resistant support core is arranged in the center of the cable core, the compression-resistant support core made of the elastic material is combined with the buffer space formed between the support core and the comprehensive sheath, so that the extrusion of the cable core caused by external pressure can be relieved, and the decomposition of external force is realized through the elasticity and the elastic space of the compression-resistant support core, so that the impact of the external force on the cable core is avoided, the cable core is prevented from cracking, and the service life of the cable core is prolonged;

(2) the conductor is coaxially extruded with a fire-resistant layer and an insulating layer, a mica tape is adopted for fire resistance, the material has excellent high-temperature resistance and combustion resistance, the cable has a better fire-resistant effect, the insulating layer made of crosslinked polyethylene has good thermosetting property, the long-term temperature-resistant effect is good, the cable has excellent electrical property and large current-carrying capacity, and the alkali-free glass fiber rope is used as a filling material in the center of the cable core, so that the cable has high-temperature resistance, size stability, high tensile breaking strength and chemical corrosion resistance;

(3) according to the utility model, the fireproof and oxygen-insulating mineral filling is extruded among the compression-resistant supporting core, the belting layer and the cable core, so that the fireproof and oxygen-insulating effects of the cable are improved, air can be prevented from entering, air required during combustion is reduced, the flame-retardant effect is achieved, the fireproof performance is enhanced, and factors which can cause the cable to be seriously damaged, such as the cable is corroded by moisture, water and chemical substances, can be avoided;

(4) the galvanized steel strip layer is arranged in the comprehensive sheath, so that the axial and radial limiting can be realized to the inside, the relative rotation and the movement in the sheath can be avoided, and the anti-tearing effect can be avoided.

Drawings

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

FIG. 2 is a schematic view of the structure of the compression-resistant support core of the present invention;

fig. 3 is a schematic view of the structure of the comprehensive sheath of the utility model.

In the figure: 1. a cable core; 101. a conductor; 102. an insulating layer; 103. a filler; 104. a refractory layer; 2. a belting layer; 3. a comprehensive sheath; 301. a flame retardant polyvinyl chloride inner liner; 302. a galvanized steel strip armor layer; 303. a flame retardant polyolefin outer jacket; 4. a compression-resistant support core; 5. and (5) mineral filling.

Detailed Description

In the description of the present invention, words similar to "front", "rear", "left", "right", etc. indicating directions or positional relationships are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation and be operated, and thus, should not be construed as limiting the present invention.

The utility model provides a technical scheme that: a B1-grade fire-resistant cable for constructional engineering is disclosed, as shown in figures 1 to 3, and comprises a belting layer 2 arranged outside a cable core 1, and further comprises a comprehensive sheath 3 extruded outside the belting layer 2, wherein the cable core 1 consists of a compression-resistant supporting core 4 and four insulated wires embedded in the cambered surface of the compression-resistant supporting core 4, each insulated wire consists of a conductor 101, a fire-resistant layer 104 coaxially wrapped outside the conductor 101 and an extruded insulating layer 102, the cable core 1 further comprises a filling material 103 extruded between the compression-resistant supporting core 4 and the insulated wires, the belting layer 2 is wrapped outside the compression-resistant supporting core 4, and fire-resistant and oxygen-insulating mineral filler 5 is extruded among the compression-resistant supporting core 4, the belting layer 2 and the cable core 1; the comprehensive sheath 3 is composed of a flame-retardant polyvinyl chloride inner liner layer 301, a galvanized steel strip armor layer 302 and a flame-retardant polyolefin outer sheath 303 which are coaxially and sequentially extruded outside the belting layer 2.

As shown in fig. 1 and 2, the anti-compression support core 4 comprises a core strip and an anti-compression support strip fixed on the outer wall of the core strip along the axis, the longitudinal section of the anti-compression support strip is of a fan-shaped structure, the protection effect of the cable can be better realized, and the core is wrapped in the anti-compression support core 4, so that the roundness of the core is ensured.

As shown in fig. 1, the fire-resistant layer 104 is a mica tape, the insulating layer 102 is made of cross-linked polyethylene, and the filler 103 is an alkali-free glass fiber rope, so that the self-protection effect of the cable core is improved.

As shown in fig. 1, mineral filling 5 is fire clay, increases the fire-resistant, oxygen-insulating effect of cable, can prevent air admission, and required air when reducing the burning plays fire-retardant effect, has strengthened fire behavior, can avoid receiving moreover that these can make the cable suffer the factor of serious destruction such as humidity, water, chemical substance corrosive action.

As shown in fig. 1, the wrapping layer 2 is a glass fiber tape wrapping layer, so that the tensile strength and the elastic coefficient of the cable are further improved, and the cable can bear larger impact energy.

The principle of the utility model is as follows: the mica tape is coaxially and sequentially wrapped outside the conductor 101, the crosslinked polyethylene insulating layer 102 is extruded, the mica tape has excellent high-temperature resistance and combustion resistance, the cable has a better fireproof effect, the insulating layer 102 made of crosslinked polyethylene has good thermosetting property, a long-term temperature resistance effect is good, the cable has excellent electrical property and large current-carrying capacity, the alkali-free glass fiber rope is used as a filling material in the center of the cable core, the cable has high temperature resistance, dimensional stability, high tensile breaking strength and improved chemical corrosion resistance, the compression-resistant supporting core 4 is arranged in the center of the cable core 1, the compression-resistant supporting core 4 made of the elastic material can relieve the extrusion of external pressure on the cable core by combining with a buffer space formed between the supporting core and the comprehensive sheath, and the decomposition of external force is realized through the elasticity and the elastic space of the self-elastic material, so that the impact of the external force on the cable core is greatly reduced, prevent that the cable core from taking place the fracture phenomenon, prolong its life 2, resistance to compression support core 4, band layer 2, crowded package has fire-resistant mineral packing 5 that separates oxygen between cable core 1, the fire-resistant of cable has been increased, separate the oxygen effect, can prevent the air admission, required air when reducing the burning, play flame retardant efficiency, fire prevention corrosion resistance and waterproof performance have been strengthened, the crowded package has galvanized steel strip armor 302 of galvanized steel strip in the comprehensive sheath 3, can play axial and radial spacing inwards, avoid relative rotation and drunkenness in the sheath, the fire-retardant polyolefin oversheath 303 of fire-retardant polyolefin material and the fire-retardant polyvinyl chloride inner liner 301 of fire-retardant polyvinyl chloride material, it is fire-retardant to have, wear-resisting, resistance to compression, insulating effect, make the inner core obtain fine protection.

Claims (5)

1. A B1-grade fire-resistant cable for constructional engineering is characterized by comprising a belting layer arranged outside a cable core and a comprehensive sheath extruded outside the belting layer, wherein the cable core consists of a compression-resistant support core and four insulated wires embedded in the cambered surface of the compression-resistant support core, each insulated wire consists of a conductor, a fire-resistant layer coaxially wrapped outside the conductor and an extruded insulating layer, the cable core further comprises a filler extruded between the compression-resistant support core and the insulated wires, the belting layer is wrapped outside the compression-resistant support core, and fire-resistant oxygen-insulating mineral filling is extruded among the compression-resistant support core, the belting layer and the cable core; the comprehensive sheath is composed of a flame-retardant polyvinyl chloride inner liner layer, a galvanized steel strip armor layer and a flame-retardant polyolefin outer sheath which are coaxially and sequentially extruded outside the wrapping layer.

2. The B1-grade fire-resistant cable for constructional engineering as claimed in claim 1, wherein the compression-resistant support core comprises a core bar and a compression-resistant support bar fixed on the outer wall of the core bar along the axis, and the longitudinal section of the compression-resistant support bar is of a fan-shaped structure.

3. The fire-resistant cable grade B1 for constructional engineering as claimed in claim 1, wherein the fire-resistant layer is mica tape, the insulating layer is made of cross-linked polyethylene, and the filler is alkali-free glass fiber rope.

4. The fire-resistant cable grade B1 for construction engineering according to claim 1, wherein the mineral filler is fire clay.

5. The fire-resistant cable for building engineering grade B1 of claim 1, wherein the tape wrapping layer is a glass fiber tape wrapping layer.

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