RU206223U1 - Electric cable with flat conductive cores - Google Patents

Abstract

The utility model is intended for transmission of electrical energy and electrical signals of low power during operation as part of telecommunications equipment. To increase the service life by reducing the mechanical stress on the insulation and sheath, the insulated conductive cores of the cable, covered with insulation from a polymer composition, are laid flat side to each other and twisted into a core together in a spiral with a certain twisting pitch. 8 p.p. f-ly, 1 dwg.

Description

The utility model is intended for the transmission of electrical energy and electrical signals of low power during operation as part of telecommunications equipment under conditions of increased requirements for ensuring electromagnetic compatibility and minimal distortion of the shape of transmitted signals, as well as for other applications requiring low inductance.

Known connection cable with flat parallel conductors (patent RU 184464 publ. 10/26/2018), which has one or more conductive conductors, each of which is insulated with a screen and consists of three strands of copper wires laid in parallel in one plane, while the strands do not twist between themselves and stacked in parallel end-to-end.

The main disadvantage of this utility model is its limited flexibility. When the cable is bent, the sections that are internal to the bending path are compressed, and the external ones are stretched. However, due to the fact that the longitudinal dimensions of the cables are an order of magnitude or more larger than their transverse dimensions, the cables are unstable with respect to longitudinal compressive loads and under their influence, the cable and its structural elements, including current-carrying conductors, tend not to decrease their linear dimensions in the first place. , elastically deforming, but changing its spatial position. With the parallel arrangement of the strands in the core and the cores in the core, due to the tightly applied insulation and sheath during bending, there is no possibility of redistribution of the "excess" length of the strands and cores, as a result of which the cable has increased resistance to bending, which requires additional efforts to overcome. An attempt to bend a cable of the specified design along a small radius (for example, in a hard-to-reach place) with excessive force can lead to irreversible loop or corkscrew deformation of the conductors with the formation of hidden damage or a break in the insulation or sheath.

The technical problem to be solved consists in the development and creation of an electric cable with flat conductive conductors, resistant to mechanical stress.

The achieved technical result is to increase the service life by reducing the mechanical effects on the insulation and sheath when bending the cable.

The task underlying this utility model, with the achievement of the claimed technical result, is solved by the fact that in an electric cable with flat conductive conductors covered with insulation from a polymer composition, in a common metal screen and a sheath made of a polymer composition, insulated conductive conductors laid with a flat side to each other, twisted into a core between each other in a spiral, while the twisting pitch of the insulated conductors between each other is from 16D to 50D,

where: Дн - the diameter of the circle described over the twisted cores.

In addition, the conductive cores are made of three strands of tinned copper wires laid in parallel in one plane close to each other.

In addition, the insulation of the conductors is made of a cross-linked polyolefin polymer composition.

In addition, a synthetic tape fastening winding is applied over the cable core.

In addition, the screen is made combined in the form of sequentially superimposed windings of an alumopolymer tape and a braid of tinned copper wires.

In addition, a synthetic tape separating layer is applied over the screen.

In addition, the casing is made of polyvinyl chloride plastic compound, and as the PVC compound, PVC compound of reduced flammability and / or reduced fire hazard can be used.

In addition, the shell is made of a halogen-free polymer composition.

The present utility model is illustrated by a specific example of the implementation of an electric cable with flat conductive conductors, which clearly demonstrates the possibility of obtaining the specified technical result.

Various modifications and improvements are permitted without departing from the scope of the invention as defined by the appended claims.

The preferred embodiment of the utility model is described below on the basis of the presented figure.

Structurally, the cable is made of two conductive cores 1, laid flat side to each other and twisted together, each of which has insulation 2 made of polymer material and consists of several strands twisted of tinned copper wires, laid in parallel in one plane close to each other. On top of the twisted core, a common shield 3 and a shell 4 made of polymer material are sequentially superimposed.

Mainly, the common shield 3 is made as a combined one, consisting of one or several strips of laminated aluminum foil and braid of tinned copper wires superimposed with an overlapping metal layer outward, however, depending on the required level of noise immunity, it can also be made:

- from strips of aluminum foil, including laminated;

- from tapes of copper foil, including laminated;

- in the form of a braid of copper or tinned copper wires;

- combined, from tapes of copper foil, including laminated, and braid from copper wires.

Additionally, the cable may contain a fastening winding 5 of one or more synthetic tapes over the core and / or a separating layer of one or more synthetic tapes 6 applied over the screen longitudinally or with a winding.

In order to reduce the likelihood of damage to the insulation of conductive conductors with a cutting tool and to increase the convenience of cutting the ends of the cable during installation work, a longitudinal arrangement 7 of synthetic thread is provided under the cable sheath.

The proposed design of an electric cable with flat conductive cores is structurally simple and available for implementation on the basis of well-known equipment, materials and technologies existing in the cable industry.

The design of the electric cable in the proposed set of essential features has not been identified in the known sources of information, which confirms its novelty.

The claimed electric cable meets the criterion of "industrial applicability", since it can be repeatedly produced and used for its intended purpose with the achievement of the specified technical result.

Claims (10)

1. An electric cable with flat current-carrying conductors covered with an insulation made of a polymer composition, in a common metal screen and a sheath made of a polymer composition, characterized in that the insulated conductive conductors, laid flat side to each other, are twisted into a core together in a spiral, while the pitch of twisting the insulated conductors between each other is from 16D to 50D, where Дн is the diameter of the circle described over the twisted veins. 2. The cable according to claim 1, characterized in that the conductive cores are made of three strands of tinned copper wires laid in parallel in one plane close to each other. 3. A cable according to claim 1, characterized in that the insulation of the conductive cores is made of a cross-linked polyolefin polymer composition. 4. The cable according to claim 1, characterized in that a fastening winding made of synthetic tape is applied over the cable core. 5. The cable according to claim 1, characterized in that the screen is combined in the form of sequentially superimposed windings of an alumopolymer tape and a braid of tinned copper wires. 6. A cable according to claim 1, characterized in that a separating layer of synthetic tape is applied over the screen. 7. Cable according to claim 1, characterized in that the sheath is made of PVC compound. 8. The cable according to claim 7, characterized in that PVC compound of reduced flammability and / or reduced fire hazard is used as the PVC compound. 9. Cable according to claim 1, characterized in that the sheath is made of a halogen-free polymer composition.

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