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RU-2861398-C1 - OVERHEAD COMMUNICATION CABLE AND METHOD FOR PRODUCING THE SAME

RU2861398C1RU 2861398 C1RU2861398 C1RU 2861398C1RU-2861398-C1

Abstract

FIELD: electrical engineering. SUBSTANCE: invention relates to overhead communication cables used for laying overhead lines of digital communication systems. The cable contains a sheath, inside which a core and a strength member are located. The core contains insulated copper conductive wires, and the strength member is made in the form of a steel wire rope. Wherein, the sheath is applied to the core and to the preheated rope with compression. EFFECT: eliminating uneven shrinkage of the sheath, gas inclusions and adhesion defects, and increasing resistance to tensile forces. 6 cl, 1 dwg

Inventors

  • Aliushev Farid Katfarovich

Dates

Publication Date
20260505
Application Date
20251204

Claims (6)

  1. 1. A suspended communication cable comprising a sheath, inside of which is located a core containing copper conductive conductors enclosed in insulation, and a strength element made in the form of a steel wire cable, wherein the sheath, inside of which is located the strength element, is applied with compression, characterized in that the sheath is applied with compression onto a heated cable.
  2. 2. A cable according to item 1, characterized in that the core contains 1÷100 pairs of copper conductive cores with a diameter of 0.40÷1.20 mm.
  3. 3. A method for producing an overhead communication cable, which includes forming a core containing copper conductive cores in insulation, placing it along a strength element in the form of a steel wire cable, and applying a sheath to said core and cable with crimping, characterized in that before applying the sheath, the cable is heated to a temperature that ensures improved adhesion between the cable material and the sheath material, after which the sheath is applied to said core and to the heated cable, simultaneously crimping.
  4. 4. The method according to paragraph 3, characterized in that the compression onto the heated cable is performed by vacuuming.
  5. 5. The method according to paragraph 3, characterized in that the compression onto the heated cable is performed by extrusion.
  6. 6. The method according to paragraph 3, characterized in that the cable is heated to a temperature of 50-95°C.

Description

The invention relates to the field of electrical engineering, namely cables used in laying overhead lines of digital communication systems and can be used to transmit electrical signals in broadband subscriber networks, traditional telephone networks, Internet telephony, and others. To ensure the mechanical strength of long-span overhead communication lines, a steel cable-supported design is used. The steel cable, made of wire, supports all major mechanical loads: static loads from the cable and cable's own weight; dynamic loads from wind, including vibrations and aerodynamic oscillations such as aeroelastic self-oscillations; snow and ice loads, which can increase the cable's weight in winter; and loads arising from temperature fluctuations and causing cyclic thermal expansion and contraction. In addition to the steel cable-supported design, the cable's outer sheath also contributes to the mechanical load. This sheath is typically made of polymeric materials with increased strength and resistance to external influences. It not only protects the cable's internal components from moisture, ultraviolet radiation, and chemical agents, but also partially absorbs mechanical stress: it distributes localized loads from ice or snow, dampens vibrations, and prevents the propagation of microcracks and deformations along the cable. A "COMMUNICATION CABLE WITH A ROPE" is known from Utility Model Patent No. 127240, dated December 21, 2012, published April 20, 2013, IPC H01B 5/08. It consists of conductive cores covered with insulation and enclosed in a sheath. The cable is located in the sheath, made of twisted galvanized steel wires with a diameter of 0.3 to 1.0 mm and positioned parallel to the conductive cores. The cable sheath is connected to the cable sheath by a jumper, with the cable sheath, jumper, and cable sheath being manufactured in a single manufacturing operation and constituting a single structure. The closest in technical essence is the "SUSPENDED COMMUNICATION CABLE" according to the patent for invention No. 2673568, dated 16.05.2017, published on 28.11.2018, IPC H01B 11/02, containing a shell, inside which is located a core, containing 1÷100 pairs of copper conductive cores with a diameter of 0.40÷1.20 mm, enclosed in insulation, and a strength element, made mainly in the form of at least one steel wire or cable made of steel wire with a diameter of 0.2÷1.5 mm, located parallel to the core, and from natural or synthetic threads, wherein the shell, inside which the strength element is located, is applied with compression. In a well-known solution for overhead communication cables, the sheath is applied to a steel power cable using crimping to increase adhesion and tensile strength. The high thermal conductivity of the metal cable leads to rapid cooling of the inner layers of the applied polymer melt, causing significant thermal stress and uneven shrinkage. These stresses not only promote microcracks and accelerated aging of the material, but also reduce the contact area, resulting in insufficient adhesion between the metal surface and the polymer, the presence of air gaps, and reduced structural integrity, significantly reducing the expected effect of the crimping. As a result, despite the mechanical seal, reliable adhesion between the sheath and cable is not achieved. The objective of the claimed technical solution is to improve the performance characteristics of the overhead communication cable. The stated problem is solved by means of a suspended communication cable containing a sheath, inside which is located a core containing 1÷100 pairs of copper conductive cores with a diameter of 0.40÷1.20 mm, enclosed in insulation, and a strength element made in the form of a cable made of steel wire, wherein the method for producing the communication cable includes forming the core, placing it along the strength element and applying a polymer sheath to said core and strength element with compression by vacuuming or extrusion with preliminary heating of the cable to a temperature of 50 - 95 °C, ensuring improved adhesion between the cable material and the sheath material. The essence of the technical solution is illustrated by the drawing, where Fig. 1 is a cross-section of the overhead communication cable. Fig. 1 shows: a suspended communication cable 1, a cable sheath 2, a screen 3, conductive cores 4, insulation 5, a cable sheath 6, a cable 7, a jumper 8. The overhead communication cable is made as follows. A suspended communication cable 1 comprises a sheath 2 containing a core. The core contains a paired number of conductive copper conductors 4. In specific implementation cases, the cable core 1 may contain from one to one hundred pairs of conductive conductors 4. Depending on the tasks to be solved, the conductive conductors may have a diameter of 0.4 to 1.2 mm. Optionally, the conductive conductors 4 are stranded. Stranded conductors 4 provide increased elasticity and flexibility. The conductive conducto