Fireproof cable

Abstract

The invention relates to a fireproof cable, belonging to the technical field of wires and cables. The fireproof cable comprises a conductive wire core, a wrapping layer wrapped outside the conductive wire core and an insulation layer extruded outside the wrapping layer, wherein the wrapping layer comprises a first fireproof mica tape and a second fireproof mica tape which have opposite wrapping directions; the first fireproof mica tape is wrapped outside the conductive wire core in a connection mode; the second fireproof mica tape is wrapped outside the first fireproof mica tape in the same connection mode; and the insulation layer is extruded outside the second fireproof mica tape. The technical scheme replaces the traditional overlapping mode for wrapping the fireproof mica tapes with a connecting mode for wrapping the first fireproof mica tape and the second fireproof mica tape which have opposite wrapping directions, thereby not only improving the fireproof effect and saving the fireproof mica tapes, but also improving the flexibility and the external diameter of the fireproof cable and the wrapping efficiency.

Description

technical field [0001] The invention belongs to the technical field of wires and cables, and in particular relates to a fireproof cable, which is used as a power supply and a control signal connection line of various security equipment. Background technique [0002] With the rapid development of my country's economy, various construction projects are developing at an unprecedented scale and speed, and high-rise buildings are getting higher and higher, so the requirements for electrical equipment are becoming increasingly stringent. However, in recent years, fires caused by electricity have gradually increased, and fires caused by wires and cables account for a considerable proportion. For this reason, people pay great attention to the flame retardant effect of wires and cables. Coating (wrapping) a fire-resistant tape on the outside of the conductor (also called the core) and then extruding an insulating sheath on the outside of the fire-resistant tape can reflect the fire r...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the refractory mica tape is usually wrapped around the conductive wire core in a wrapping method with an overlap of more than 50%. The fireproof cable obtained by this wrapping method seems to be safe, but objectively there are the following technical problems: Overlapping more than 50% of the refractory mica tape will undoubtedly cause a serious waste of refractory mica tape; second, although the overlap is more than 50%, the non-overlapping part still appears as a single layer, and the fireproof effect is bound to be fragile; third, it affects the softness of the cable Fourth, it directly leads to the increase of the outer diameter of the cable, which causes inconvenience to use, such as inconvenient laying in a small space; fifth, the processing efficiency of the cable is low, because the overlap is more than 50%, it is bound to consume a long winding package time

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