RU44881U1 - POWER FLEXIBLE CABLE - Google Patents

Abstract

A flexible multi-core power cable with rubber insulation and a sheath contains one or more reinforcing elements, which are an uninsulated or insulated bundle (s) based on aramid threads. Flexible multi-core power cable with rubber insulation and sheath is used for mounting power and control circuits on mobile machines and mechanisms at voltages up to 660 V AC and frequencies up to 400 Hz. The cable is designed for operation at ambient temperatures from minus 40 to plus 50 ° C. The development of a cable of the KGU flexible brand with the content of one or several reinforcing elements in the structure allows to achieve increased cable strength while maintaining its high flexibility, to increase the tensile strength of the cable, which makes it possible to increase the distance between the supports in the presence of air suspension sections in the power line. The technical result - increasing the strength of the cable while maintaining its flexibility - is achieved by using in its design a flexible power element made of aramid threads. Thanks to the developed utility model, it becomes possible to increase the tensile strength of flexible cables, and when airing these cables, to increase the distance between the supports.

Description

Flexible multi-core power cables with rubber insulation and sheath are designed to connect mobile mechanisms to electrical networks, including when there are vertical or horizontal air suspension in the line sections.

Cables are designed for operation at ambient temperature from plus 50 ° С to minus 40 ° С.

Information about analogues is taken from the reference book “Electric wires and cords”, authors N.I. Belorussov, A.E. Saakyan, A.I. Yakovleva, publishing house “Energy”, Moscow, 1979

The closest analogue in terms of essential features is a flexible cable with rubber insulation of general purpose of the KG brand according to TU 16.K73.05-93.

Flexible cable with copper conductors, with rubber insulation in a rubber sheath is designed to connect various mobile mechanisms with alternating voltage up to 660 V at a frequency of 400 Hz. Primary area of application: for bends with a radius of at least 8 D and a temperature of minus 40 to plus 50 ° C.

KG cable design elements: conductive conductors, insulation, sheath.

Signs of an analogue that coincide with the essential features of a flexible multi-core power cable with rubber insulation and sheath:

- the nominal cross section of the main copper conductors is 0.75-6 mm ² ;

- cables with two and three main conductors may have an earth conductor;

- rubber insulation;

- insulated conductors twisted;

- twisting step of insulated cores - no more than 16 diameters per cable twisting;

- sheath made of rubber.

The use of cables of the KG brand with vertical or horizontal aerial laying could lead to damage to the cable in case of increased mechanical load.

An essential feature of the claimed utility model is the presence in its design of one or more reinforcing elements, which are a non-insulated or rubber-insulated tourniquet based on aramid threads.

The development of a cable of the KGU flexible brand with the content of one or several reinforcing elements in the structure allows to achieve increased cable strength while maintaining its high flexibility, to increase the tensile strength of the cable, which makes it possible to increase the distance between supports in the presence of air suspension sections in the cable line.

Insulated cores of the cable are twisted around the bundle or together with the bundle (s) of aramid threads in the right direction.

The technical result - increasing the mechanical strength of the cable while maintaining its flexibility - is achieved by using in its design a flexible power element made of aramid threads.

The drawing shows:

figure 1 is a diagram of a power flexible cable with rubber insulation and a sheath of the KGU brand with five conductive conductors with a cross section of 0.75 mm ² , aramid yarn core, with rubber insulation and sheath.

Description of the design of the utility model - flexible flexible multi-core power cable with rubber insulation and sheath:

- Multi-wire conductive copper conductors (Fig. 1, pos. 1) correspond to class 5 according to GOST 22483. The conductors do not have burrs, cutting edges, bulging and breaks in individual wires that can damage the insulation. Serve for direction

flow of electrical energy. The nominal cable diameter is shown in Table 1. The upper limit deviation from the nominal cable diameter is + 10%, the lower limit deviation is not standardized.

Table 1 Number of cable cores Nominal outer diameter of a cable, mm, at a nominal section of the main veins, mm ² 0.75 1,0 1,5 2,5 4 6 2 8.2 8.5 9,4 11.2 13.5 15,5 2+ 8.8 9.1 10.1 11.8 13.9 16.3 3 8.8 9.1 10.1 12.0 14.5 16.6 3+ 9.8 10.1 11.1 13,2 15,5 18.0 4 9.8 10.1 11.1 13,2 16,0 18,4 5 10.8 11.1 12,2 14.5 17.8 20.5

Rubber insulation is applied to the main conductors and the ground conductor (Fig. 1, pos. 2). Insulation is applied in one or two layers. The nominal insulation thickness is shown in Table 2. The lower limit deviation from the nominal insulation thickness is 0.1 mm + 10% of the nominal value, the upper limit deviation is not standardized.

table 2 Nominal cross section, mm ² Nominal insulation thickness, mm 0.75-1.5 0.8 2,5 0.9 4 and 6 1,0

Cables with a number of cores 3 and 4 may have a grounding conductor. Insulated cores must have distinctive colors. In the case of double-layer insulation, only the outer layer of insulation is allowed to be painted. The insulation of the ground conductor must be a combination of green and yellow colors.

One or more non-insulated or rubber-insulated aramid strands are located in the center of the cable (Fig. 1, pos. 3) or can be twisted together with insulated cable cores. The twist direction is right. The twisting step should be no more than 16 diameters for twisting the cable.

On top of twisted veins superimposed synthetic film and a sheath of rubber (figure 1, position 4). The nominal shell thickness is shown in Table 3. The lower limit deviation from the nominal shell thickness is 0.1 mm + 15% of the nominal value, the upper limit deviation is not standardized. On the surface of the insulation and the shell there should not be cracks, bubbles and dents that deduce the thickness of the insulation and the shell beyond the maximum deviations.

Table 3 Number of cable cores Nominal shell thickness, mm, with a nominal cross section of the main cores, mm ² 0.75 1,0 1,5 2,5 4 6 2 1.3 1.3 1,5 1.7 1.8 2.0 2+ 1.4 1.4 1,6 1.7 1.9 2.0 3 1.4 1.4 1,6 1.8 1.9 2.1 3+ 1,5 1,5 1.7 1.9 2.0 2.1 4 1,5 1,5 1.7 1.9 2.0 2,3 5 1.6 1,6 1.8 2.0 2.2 2,5

The way to use the utility model.

Flexible multi-core power cables with rubber insulation and sheath are used for mounting power and control circuits on mobile machines and mechanisms at voltages up to 660 V AC and frequencies up to 400 Hz. Cables are designed for operation at ambient temperature from minus 40 to plus 50 ° С. The minimum bending radius during installation must be at least 8 cable diameters.

Flexible multi-core power cable with rubber insulation and sheath is attached to mobile mechanisms. Under the action of the supplied voltage, an electric current arises, which, distributed throughout the entire cross section of the conductive core (Fig. 1, pos. 1), is transmitted from the source to the consumer. The insulation from rubber (Fig. 1, pos. 2) creates a geometrically stable insulating gap, which protects the cores from a short circuit in the circuit, and also, for safety reasons, from electric shock.

Description of structural elements, due to which it becomes possible to obtain a technical result - increasing the tensile strength of the cable.

Structural elements to achieve the desired technical result: uninsulated or insulated tow (s) based on aramid threads.

Conductors of the analogue (GOST 22483-77) - flexible cable with rubber insulation for general purpose of the KG brand (GOST 13497-77) - could not withstand vertical or horizontal aerial laying in case of increased mechanical load, which would lead to cable damage.

Thanks to the developed utility model, it becomes possible to increase the tensile strength of flexible cables, and when airing these cables, to increase the distance between the supports.

Claims (1)

A flexible multi-core power cable with rubber insulation and a sheath, containing one or more reinforcing elements, representing an uninsulated or insulated bundle based on aramid filaments located in the center of the cable or twisted together with current-carrying conductors of the cable.