Fireproof cable and its making method

Abstract

The invention relates to an improvement for a fire-resistant cable. The invention is characterized in that: an outer refractory insulating layer of a conductor is high temperature extruded siliceous compounds with a thickness of 0.05 to 1.0 millimeter, and an outer protective layer is a refractory fiber braid ply. Compared with the prior fire-resistant cable, the fire-resistant cable can be produced with long length; the production process is simple; the outside diameter of the cable is small; the occupied space of laying is small; the twisting property is moderate; recovery and separation ofwaste cables are easy, and recovery materials can be recycled and are pollution-free; refractory insulating raw material resources are numerous and the cost of the refractory insulating raw material resources is low, thereby the cost of fire-proof insulation of the cable can be reduced and is respectively reduced by 70 percent, 40 percent and 50 percent compared with mineral insulation, mica insulation and silicon rubber insulation; the waterproof, oil proof and radioresistant performances are superior to the prior fire-resistant cable; the refractoriness and the thermotolerant level are high; the fire-resistant cable can be operated under the environment of 1000 DEG C over a long period of time; the bend radius is 20 times or so of the cable diameter. At least one intermediate layer of the silicon refractory insulating layer is made of silicon dioxide, and an inner layer and an outer layer on both sides are made of silicon compounds different from the silicon dioxide or silicon dioxide with different crystalline structures, thereby light signals can be also transmitted and then the fire-resistant cable simultaneously has the function of photocommunication.

Description

technical field [0001] The invention is an improvement to the fire-resistant cable, in particular to a fire-resistant cable with high fire resistance, good environmental protection, acid, alkali and oil resistance. Background technique [0002] In the prior art low-voltage fire-resistant cables, the fire-resistant structure is used not only as a fire-resistant layer, but also as insulation, and its forms mainly include the following types: [0003] Fire-resistant cables with copper tubes or steel pipes with magnesium oxide as the insulating jacket, such as the Chinese patent CN2745194, although this type of fire-resistant cable has good fire-resistant performance, it can continue to be used after a fire. The main disadvantage is that the composition of the fire-resistant insulation is inorganic For powdery materials, metal casings are required to keep the shape. First, the production is difficult and the manufacturing cost is high. Especially, it cannot be produced in large ...

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Problems solved by technology

[0003] Fire-resistant cables with copper tubes or steel pipes with magnesium oxide as the insulating jacket, such as the Chinese patent CN2745194, although this type of fire-resistant cable has good fire-resistant performance, it can continue to be used after a fire. The main disadvantage is that the composition of the fire-resistant insulation is inorganic For powdery materials, metal casings are required to keep the shape. First, the production is difficult and the manufacturing cost is high. Especially, it cannot be produced in large lengths, resulting in many construction joints for laying, which increases the difficulty of laying. Second, because of the external use of metal pipes , the cable has poor bendability and is not resistant to acid and alkali corrosion. Third, in order to ensure its sufficient insulation and fire resistance, the thickness is usually thicker, and the outer diameter of the prepared cable is larger. Cable Bending Properties

[0005] Fire-resistant silicone rubber insulation, such as the Chinese patent CN2701026, has the disadvantages of relatively low temperature resistance and can only be used in environments below 300°C, and silicone rubber has poor acid and alkali resistance, and cannot be used after a fire. need to be replaced

[0007] Secondly, the existing fire-resistant cables basically only have a single power transmission function, and cannot meet the growing needs of the present

Although the prior art also has a public power / communication composite cable, it is a simple combination of two kinds of cables, such as the Chinese patent CN1152784 cable, which has a hollow conduit in the middle to wear an optical fiber, and the periphery of the conduit is a power conductor and an insulating sheath; The special optical cable disclosed by CN1929043, the optical fiber or optical fiber bundle for transmitting optical signal is located in the center of the optical cable, the outer covering is made of insulating plastic tape or plastic tube, and 30-50 conductive wire cores for electric energy transmission are wrapped around the periphery, and the outer part is polyvinyl chloride or Cross-linked vinyl chloride insulating layer and outer sheath layer; Chinese patents CN2387675 and CN2396484 disclose the power supply and communication integrated cable of the electric meter remote reading system.

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