RU161669U1 - FIRE-RESISTANT FIRE SAFE HARDENED OPTICAL CABLE - Google Patents

Abstract

1. Optical fire-resistant fireproof cable containing optical fibers placed in tubes of polymer material laid in a core around a central power element, aramid threads, inner shell, water blocking elements, armor and outer shell, characterized in that the aramid threads are laid over the core with alternating with water blocking elements, the tubes and the inner shell are made of polyetherimide, the armor is made in the form of two layers of steel round wires twisted over the core, coated with an inner shell, in opposite directions, the outer shell is made of non-combustible silicone rubber. 2. The cable according to claim 1, characterized in that the water-blocking elements are made in the form of a thread and / or tape.

Description

The utility model relates to cable technology, namely, to the construction of optical cables intended for indoor and outdoor installation on stationary objects with increased security requirements, as well as moving objects of military and civilian equipment.

Known optical fire-resistant optical cable (patent for utility model RU 106763 U1, published July 20, 2011, bull. No. 20), containing single-mode or multimode optical fibers in modular tubes made of polymeric material, laid in a core around a central power element, in the form of a fiberglass bar , with aramid threads arranged sequentially on top of the core, an inner polymer shell of a halogen-free low-fire composition based on polyolefins, a water blocking element, armor of steel corrugated tape and an outer shell of a halogen-free fireproof composition based on polyolefins, while on top of the fiberglass rod and core there are water-blocking elements in the form of a tape or thread.

This technical solution is the closest to the proposed combination of features.

A disadvantage of the known cable is the limited operating temperature range and not high mechanical strength.

The technical result, which the proposed utility model is aimed at, is to increase reliability by expanding the range of operating temperatures, increasing mechanical strength to tensile and crushing loads while maintaining weight and size characteristics and resistance to external influences.

The technical result is achieved by the fact that single-mode or multi-mode optical fibers are placed in tubes made of polyetherimide laid in a core around a central power element wrapped in a water-blocking element in the form of a tape or threads. Multilevel protection against mechanical loads is provided by: laying optical fibers inside polymer tubes with a small excess length, fiberglass bar; aramid yarns, which at the same time are a heat-insulating fireproof layer; as well as armor, consisting of two layers of round steel wires twisted over a core coated with an inner sheath in opposite directions. Protection against the longitudinal spread of moisture along aramid threads is carried out by alternating aramid and water-swelling (water blocking) threads. For bonding the core, reinforced with aramid filaments, a sheath made of a polyesterimide having a wide working temperature range of a halogen-free polymer material is used. Non-combustible silicone rubber is used as the outer shell.

The utility model is illustrated in the drawing, which shows a cable in section.

Fire-resistant, fireproof, hardened optical cable contains optical fibers 1 in tubes 2 made of polyetherimide laid in a core around a central power element 3, wrapped with a water blocking element, reinforcing aramid and water blocking threads 4, inner sheath 5, two-layer armor 6 made of round steel wires, outer sheath 7 from non-combustible silicone rubber.

In the manufacture of the cable using well-known materials manufactured on an industrial scale. The cable manufacturing technology includes the following operations: manufacturing a tube 2 from a polymer material with free placement of optical fibers 1 in it, winding the central power element 3 with a water blocking element, twisting the polymer tubes 2 with optical fibers into the core around the central power element 3, longitudinal laying of aramid and water blocking threads 4, the imposition of the inner shell 5, the sequential imposition of two layers of armor 6 and the imposition of the outer shell of non-combustible silicone rubber 7.

All operations are performed on standard equipment used for the manufacture of optical cables.

Characteristics of optical fireproof fireproof cable:

working capacity under conditions of flame exposure - not less than 60 min;

tensile strength - at least 6 kN;

operating temperature range - from minus 60 ° to 125 ° C (short-term up to 200 ° C);

- outer diameter of the cable (16 ± 0.3) mm;

- the attenuation coefficient of single-mode OM in the cable at a working wavelength of 1.31 μm is not more than 0.5 dB / km;

- attenuation coefficient of multimode OB in the cable at a working wavelength of 1.3 μm, not more than 1.5 dB / km;

- does not spread combustion when laying in a beam (category A);

- resistance to hydrostatic pressure - 1 MPa;

- does not emit corrosive substances;

- low optical density of smoke during smoldering (burning);

- resistance to the effects of nitrogen dioxide (with a concentration of 100 mg / m ³ for 30 days), solar radiation, molds, rodents.

Claims (2)

1. Optical fire-resistant fireproof cable containing optical fibers placed in tubes of polymer material laid in a core around a central power element, aramid threads, inner shell, water blocking elements, armor and outer shell, characterized in that the aramid threads are laid over the core with alternating with water blocking elements, the tubes and the inner shell are made of polyetherimide, the armor is made in the form of two layers of steel round wires twisted over the core, coated with an inner shell, in opposite directions, the outer shell is made of non-combustible silicone rubber. 2. The cable according to claim 1, characterized in that the water-blocking elements are made in the form of a thread and / or tape.

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