High-temperature-resistant flexible fireproof cable intermediate joint

Abstract

The invention discloses a high-temperature-resistant flexible fireproof cable intermediate joint. The intermediate joint comprises an intermediate joint body used for being connected with a multi-corecable insulation wire core. The intermediate joint body comprises a conductor connecting pipe. The conductor connecting pipe is sequentially wrapped by a silicone rubber self-adhesive tape, a ceramicfireproof mica tape and a silicone rubber insulating pipe from inside to outside. The gaps among the multi-core cable insulation wire cores are filled with ceramic oxygen isolation filling mud, and the periphery of the ceramic oxygen isolation filling mud is sequentially wrapped with a ceramic fire-resistant mica tape, a waterproof insulation composite tape, a sheath tube and a fireproof wrappingtape. The invention provides the high-temperature-resistant flexible fireproof cable intermediate joint. The fireproof performance of the intermediate joint is consistent with that of a connected fireproof cable. The intermediate joint is simple in structure, is smaller in size, is convenient to install, is high in insulating strength, is resistant to high temperature, is good in waterproof performance, is wide in application range, is bendable, is low in cost, and is good in fireproof performance.

Description

technical field [0001] The invention relates to a high-temperature-resistant flexible fireproof cable intermediate joint, which belongs to the technical field of cable accessories. Background technique [0002] At present, flexible fireproof cables, also known as "inorganic mineral insulated cables", are developing rapidly in China because they are softer than mineral insulated cables and easy to install and lay. It is mainly suitable for high-rise buildings in large cities, hospitals, airports, shopping malls and many construction projects that require high quality and high safety. It can achieve the purpose of safety without cutting off the power supply in the event of a fire. [0003] In the cable manufacturing and power construction process, due to the limited length of a single cable, it is necessary to connect two cables to form a longer line, which requires the connection through the cable intermediate joint, so that the cable intermediate joint has been widely used. ...

AI Technical Summary

Problems solved by technology

However, the current common cable intermediate joints have a relatively low temperature resistance level, are prone to water ingress, and do not have the performance required by fireproof cables; in order to meet fire protection requirements, an intermediate joint fire and explosion-proof box is usually installed outside the ordinary intermediate joint. Sui has fireproof performance, but it is large in size, high in cost, and cumbersome to install, and the joint body does not have fireproof performance. In the event of a fire, the heat shrinkable sleeve (or cold shrinkable tube) of the joint body will melt quickly, causing a short circuit between phases Or grounding short circuit, can not achieve the real purpose of fire prevention, so that the fireproof cable also loses the fireproof function, and can not be bent at the same time, nor can it be laid through the pipe

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