SU1377923A1 - Flexible cable - Google Patents

Abstract

The invention relates to electrical engineering, in particular, to cable technology, and can be used as a flexible current lead to shaft moving machines and mechanisms. The purpose of the invention is to reduce the consumption of materials and the complexity of the manufacture of the cable by eliminating the operations of insulating the conductors of the grounding conductor. The flexible cable is made with three main conductors 1 with rubber insulation 2, elastic electrically conductive screens 3v with three auxiliary conductors 4 with rubber insulation 5, and a rubber sheath. The earthing conductor 6 is made of two layers, alternating between copper wires and fiber filaments, a winding of synthetic tape is provided between the twigs, and twisted eyelids are twisted. core of elastic material based on fibrous filaments. 2 Il. I 7 (L

Description

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The invention relates to electrical engineering, in particular, to cable technology, and can be used as a flexible conductor to shaft moving machines and mechanisms.

The aim of the invention is to reduce the consumption of materials and the complexity of the manufacture of the cable by eliminating the operations of insulating the conductors of the earth conductor .;

1 shows a flexible cable, a cross section; Figure 2 shows the earth conductor, a cross section.

The cable contains three main conductors 1, covered with rubber insulation 2 and having individual screens 3 of electrically conductive rubber, three auxiliary conductors 4 covered with rubber insulation 5 and twisted in a separate group, and a ground conductor 6, located in the center of the cable and consisting from a flexible tensile rubber core 7 on the basis of synthetic threads 8 and copper wires 9 twisted by two layers around the core.

In order to ensure the stability of the grounding conductor under mechanical deformations of the wire of the inner and outer wires around the core in opposite directions.

The twisting steps of the wires around the core are chosen optimally in order to achieve the minimum dimensions of the grounding conductor, the least laboriousness of twisting operations while maintaining the structural stability of the conductor and are 8-10 diameters along the twist With increasing twist pitch, the mutual displacement of twisted elements increases, in particular the wires grounding conductor and, consequently, their abradability in the presence of contact between the wires.

In order to eliminate friction between the wires of the grounding wire at their mutual displacement, which is unavoidable when bending and twisting the flexible cable, between the wires in each layer along the perimeter of the core there are threads 10 made of fibers, and the outer and inner layers of the wires are separated from each other by elastic synthetic film 11, imposed on the inside

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Rendered with an overlap.

When the alternating wires and threads are twisted around the core of the wire, they come into contact with the threads, deform them in cross section, filling in the recesses on the surface of the thread, thus achieving a large area of the surface of the wire in contact with the thread and, consequently, a significant decrease in the specific thread pressure on the wire.

With a relatively small mutual pressure of the wires and threads, the friction between them with mutual longitudinal displacement is insignificant, the attrition of the wires is almost impossible, which results in high mechanical strength and, consequently, of the grounding conductor as a whole during bending and twisting of the cable. . .

The elastic synthetic film between the strands of the wires of the core performs the same functions as the filament.

The necessary resistance of the earth conductor to tensile loads is provided by the core of the core, consisting of synthetic or natural filaments, the strength characteristics of which are determined by the properties and the number of filaments used.

The following threads can be used as reinforcing elements of the grounding core: phenylone complex for cable production according to TU6-06- 32-309-79, kapron according to OST6-06-C17-77, lavsanova according to OSTb-Ob-SZ-75, GOST 24662-81. . ;

Reinforcing elements of the ground; the conductors can be made of conductive non-metallic materials, thus achieving a new effect — increasing the electrical safety of the cable by increasing the conductivity and reliability of the grounding conductor.

Thus, the threads in the strands of the vein and the base of the core can be made of carbonaceous conductive fibrous material. These include, in particular, the filaments used as a carbon core of heating wires of household appliances, introduced according to ТУ16-538.538.161-76 and having an electrical resistance of 98 Ohm M.

Polyamide, polyester and conductive elastic materials can be used to separate the strands of wire.

films, for example metallized polyamide-fluoroplastic film, for which aluminum is used for metallization. Such a layer has a small thickness of not more than 0.06 mm)., High mechanical properties - tensile strength at least 60–83 N / mm at a gap, tear resistance not less than 76 N / mm. Its surface electrical resistance does not exceed 0.02 ohms.

The core of the grounding core can be made of electrically conductive rubber with a specific electrical resistance of no more than 0.2 Ohm-m (for example, rubber type RE-2 according to OST 16 0.505.007-81).

The total conductivity of these elements provides the earthing core with the ability to perform its earthing functions even if all the wires are damaged in separate sections of the core with a length of up to 50 mm.

The use of the proposed invention reduces by 10% the outer diameter of the cable, which contributes to increasing its flexibility, improving service conditions during installation and operation of the cable, and, consequently,

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and durability; reduces the material capacity of the cable by 10% by eliminating the coating of the wires of the grounding conductor with extruded material and replacing it with wires between the wires and the elastic film between the layers of the wires; reduces by 15% the laboriousness of the cable during its manufacture by eliminating the labor-intensive operation of extruding protective material to each wire from the grounding conductor of the cable manufacturing process.

Claims (1)

Invention Formula A flexible cable containing insulated core and auxiliary conductors twisted around the back of the ffl cable. conductors made of conductors wound by two layers on an elastic stretching core, characterized in that, in order to reduce the material intensity and labor-consuming manufacture of the cable by eliminating isolation of the conductors of the grounding conductor, the grounding conductors are filled in alternately alternating conductor lines its operational reliability and fiber yarns. FIG. 2