RU65680U1 - HIGH FREQUENCY COMMUNICATION WIRE - Google Patents

Abstract

The utility model relates to communication and signaling wires. Two soft copper or copper tinned single-wire insulated conductive conductors and a high-strength synthetic thread are twisted with a constant pitch of not more than 30 mm. A polymer shell of circular cross section is superimposed on the twist. The shell is made with filling the air space between the twisting elements.

The proposed design of the wire allows you to keep unchanged geometric and high-frequency electrical parameters of the wire.

Description

The utility model relates to the cable industry and can be used in the construction of communication and signaling wires.

In telephone networks, there are areas where the incoming multi-pair cable needs to be split in pairs in different directions.

In automatic telephone exchanges, such a section is telephone cross. Incoming telephone pairs are connected on the outside of the cross, and the pairs on the inside of the cross are connected to subscriber sets or switching devices using cross-over wires.

Currently, another similar section has appeared that requires a similar pairing of consumers (subscribers). To provide Internet services to residents of apartment buildings using xDSL systems, providers, as a rule, distribute and / or switch devices in the attic or in the basement, and communicate with the subscriber through a pair of cores dragged during installation through existing cable channels, filled with other cables, which leads to significant mechanical stress during installation.

Known cross wires of the PKSV type (NI Belorusov, A.E. Saakyan, A.I. Yakovleva "Electric cables, wires and cords. Reference book", M., "Energoatomizdat", 1987) two-, three- and four - vein execution. PVC conductive copper conductors are twisted in two, three, four wires to form a wire of the corresponding design.

Copper and plastic are ductile materials, so cross-wire wires of the PKSV type cannot be used for pulling into filled cable channels.

Known communication wire mounting by utility model No. 32915, class НВВ 7/00. It contains twisted together conductive conductors made of galvanized steel wire, coated with insulation from a thermoplastic polymer material.

Steel is a rigid, non-ductile material not subject to significant stretching. However, when high-frequency signals are transmitted through such conductive cores, the attenuation coefficient in them sharply increases due to the formation of eddy currents.

The technical task of the proposed utility model is to create a high-frequency communication wire that keeps the geometric parameters of the wire unchanged, in particular, twisting steps and, accordingly, high-frequency electrical parameters after pulling through the filled cable channels.

The technical problem is solved by the fact that a high-frequency communication wire is proposed, including two copper soft or copper tinned single-wire conductive conductors insulated with polymer, twisted in a pair with a constant pitch of not more than 30 mm simultaneously with high-strength synthetic thread, a polymer sheath is laid on top of the twist with filling the air space between twisting elements.

In this case, a high-strength synthetic thread is an element to which a force is applied when pulling the wire into the filled cable channel. At the same time, the same thread when cutting the wire is used as a rep-cord (cuts the sheath and releases insulated cores for stripping).

The shell with filling creates a round cylindrical surface that reduces friction and simplifies the pulling of the wire in the channel, as well as preventing the change of the twisting steps (shift of the turns) during the pulling process.

For the convenience of cutting the shell, it is advisable to lay two high-strength synthetic threads symmetrically with respect to a pair of insulated conductive conductors.

If it is necessary to minimize the attenuation coefficient of the wires, it is advisable that at least the sheath of the wires be made of foam material.

When presenting the requirements of non-proliferation of combustion and reduced smoke emission, it is advisable to at least produce a sheath of wire from polyvinyl chloride plastic compound with reduced smoke emission or from a halogen-free composition with an oxygen index of 35 and 40, respectively.

When presenting increased requirements for protecting the wire from electromagnetic influences from neighboring wires and cables, the sheath of the high-frequency communication wire is performed with pieces of foil evenly inserted in volume that are no more than 5 mm in size, constituting no more than 10% of the sheath material volume.

Further, the proposed utility model is illustrated with a specific example of execution and an explanatory drawing, presented in figure 1, which shows a cross section of a high-frequency communication wire.

High-frequency communication wire 1 (Fig. 1) consists of two soft copper single-wire conductive conductors 2 insulated with polymer 3, twisted with a constant pitch of not more than 30 mm between each other and at the same time with high-strength synthetic thread 4 and coated with a sheath with filling 5 of polymer material.

The manufacturing technology of high-frequency wires according to the claimed utility model includes the following operations.

Conducting cores 2 are made of copper wire "wire rod", usually with a diameter of 8 mm by drawing. Depending on the diameter of the finished conductive core, the following operations can be used: coarse and medium drawing or coarse, medium and thin drawing.

Single wire tinned wires are annealed to provide softness. Separate annealing can be carried out in annealing furnaces.

Annealing is not required to obtain tinned veins. Tinning is carried out in hot tinning plants, as a result of which the core becomes soft.

Insulation of 3 conductive wires 2 is carried out on extrusion lines. Three operations can be combined in an automatic extrusion line: medium drawing (up to the required diameter of the finished conductive core), annealing and insulation.

Twisting lived in a couple with simultaneous twisting with high-strength synthetic thread 4 can be carried out on frame type machines. As a high-strength synthetic thread, polypropylene or aramid threads can be used.

The sheath 5 is superimposed on the extrusion line by the compression method, in which the mass of the sheath fills all the voids between the twisting elements (cores and thread).

Prototypes were made in the amount of 5 pieces with a length of 10 m each. Prior to testing, the samples were measured electrical resistance of conductive conductors.

A test was conducted to pull the wires through a filled cable duct. The maximum tension force was 10 kgf.

After the tests, a visual inspection of the outer surface of the samples was performed and the electrical resistance of the conductive wires was measured.

Violations of the outer surface of the samples is not installed. The measured values of the electrical resistance of the conductive conductors after testing, up to an accuracy of the measurements, coincide with the primary measurements.

The tests carried out confirm the achievement of the technical result.

Claims (5)

1. High-frequency communication wire, including two soft copper or copper tinned single-wire conductive cores insulated with polymer, twisted together with a constant pitch of not more than 30 mm, characterized in that simultaneously with the conductive cores a high-strength synthetic thread is twisted and a polymer is laid over the twist a shell of circular cross section with filling the air space between the twisting elements. 2. The wire according to claim 1, characterized in that the twist laid two high-strength synthetic threads symmetrically with respect to a pair of conductive wires. 3. The wire according to claim 1, characterized in that at least the sheath is made of foamed polymer. 4. The wire according to claim 1, characterized in that at least the sheath is made of polyvinylchloride plastic compound with reduced smoke emission or from a halogen-free composition with an oxygen index of 35 and 40, respectively. 5. The wire according to claims 1 and 4, characterized in that the foil pieces with a size of not more than 5 mm, comprising not more than 10% of the volume of the material, are introduced uniformly in volume into the sheath.