RU58775U1 - COMMUNICATION CABLE - Google Patents

Abstract

The utility model relates to the field of electrical engineering, namely to the construction of telephone cables, zone communication cables, for inter-office and subscriber communications, which are used on group subscriber lines to transmit digital signals at speeds up to 2048 kbit / s or analog signals in the frequency range 12-552 kHz

The cable contains single-wire copper conductors insulated with polyethylene, comprising pairs or fours, twisted into a core, on top of which a belt insulation, a shield, an inner polymer shell, armor and a protective polymer shell are sequentially applied. In the cable, the armor is made in the form of a corrugated steel tape longitudinally superimposed with overlapping, having a zinc coating or tinned, or laminated on both sides, at least coated. one inner layer of hydrophobic aggregate.

The cable may further comprise, under the protective sheath, a release layer of polymer film superimposed on the outer layer of the hydrophobic aggregate over the armor.

The free space inside the core may be filled with a hydrophobic aggregate. The cable has good mechanical protection, is more resistant to bending.

9 p. Formula 2 illustrations

Description

The utility model relates to the field of electrical engineering, namely to the construction of telephone cables, zone communication cables, for inter-office and subscriber communications, which are used on group subscriber lines to transmit digital signals at speeds up to 2048 kbit / s or analog signals in the frequency range 12-552 kHz with a rated voltage of remote power supply up to 225-690 V AC with a frequency of 50 Hz or voltage up to 315-500 V DC, respectively.

A symmetric cable for zone communication is known, in which copper conductors with a diameter of 1.2 mm with continuous polyethylene insulation are twisted into a four around a polyethylene cord. Belt insulation is made in the form of filling from the composition of polyethylene and butyl rubber. The screen is made of two annealed copper or aluminum strips, imposed with a gap. Between the upper and lower aluminum strips or under them one tinned copper wire is longitudinally passed. A bitumen layer and an inner shell of polyethylene are applied on top of the aluminum screen. The core may be filled with a hydrophobic mass. The armor is made of steel or steel galvanized tapes or wires. ("Communication cables high-frequency single-channel with polyethylene insulation". TU 16-505.233-96).

The disadvantage of the cable is the large overall dimensions, high consumption of materials.

Also known is a local communication cable high-frequency brand KSPP with copper conductors 0.64-1.2 mm in polyethylene insulation and sheath. The cores are twisted into a four with belt insulation, a screen made of aluminum tape, coated with a bitumen composition and an inner shell of polyethylene. The core may be filled with a hydrophobic mass. The armor is made of steel or steel galvanized strips. (“High-frequency local communication cables” TU 16.K71-061-89).

However, the cable has insufficient flexibility, it does not meet the requirements for non-proliferation of combustion (fire resistance), the possibility of laying only in the ground in rural areas.

The prototype is a telephone communication cable of the Chamber of Commerce and Industry for urban and rural telephone networks with a rated voltage of up to 225 V AC, which contains single-wire copper conductors with polyethylene insulation, twisted in pairs or in quadruples and in the core. The belt insulation of the core is made in the form of a winding with synthetic tapes. A shield in the form of an aluminum or aluminum-polyethylene tape with overlapping and a grounding conductor underneath is longitudinally superimposed over the waist insulation. The space between the cores in the core of the cable can be filled with a hydrophobic filler. A polyethylene sheath is applied over the cable screen. The armor is made of steel or steel galvanized strips. The cable is covered with a polyethylene sheath. ("City telephone cables with polyethylene insulation in a plastic sheath" GOST 22498-88).

The cable has disadvantages: limited laying due to low moisture resistance, insufficient mechanical protection and poor protection against rodents, as well as insufficient flexibility.

The present utility model is based on the task of creating a communication cable in which a new implementation of structural elements, a new combination of them would provide the cable with virtually unlimited laying conditions, and increase resistance to bending.

The problem is solved in that in a communication cable containing single-wire copper conductors insulated with polyethylene, comprising pairs or fours twisted into a core, on top of which a belt insulation, a shield, an inner polymer shell, armor and a protective polymer sheath are sequentially applied, according to a utility model, the armor is made in the form of a longitudinally coated corrugated steel tape coated with at least one inner layer of hydrophobic aggregate.

Due to the implementation of the armor in the form of a longitudinally overlapping corrugated steel coated tape, the cable has several advantages. Corrugated steel tape is more resistant to bending and is a good protection against rodents. The inner polymer sheath serves as a pillow for armor, and the coating with at least one inner layer of hydrophobic aggregate additionally seals the cable and improves its flexibility.

In addition, there is the possibility of various cable options: for installation in telephone conduits, in soil, water, inside the building, including in conditions of high fire hazard.

Steel corrugated tape can be made with zinc coating or tinned, which reliably protects the steel tape from corrosion (even in the absence of hydrophobic filler) and increases the service life of the cable.

Corrugated steel tape can be laminated on both sides, while the polymer layer is welded with it when a plastic sheath is applied and the armor becomes airtight at the overlap.

The screen can be laid longitudinally from aluminum or from aluminum-polyethylene tape with metal inside, and a tinned copper grounding conductor is laid under it, which increases the efficiency of shielding.

The free space inside the core and over the waist insulation may additionally contain a hydrophobic filler, which makes the cable waterproof throughout the entire construction length.

The cable may additionally contain a separating layer of polymer film under the protective sheath, which eliminates the contamination of the extruder head with a hydrophobic filler and greatly facilitates the technology of applying the protective sheath.

The inner and protective shells can be made of polyethylene.

The protective shell may be made of low flammability polyvinyl chloride plastic compound.

The protective sheath can be made of PVC compound with reduced smoke and gas emission, which significantly increases the fire resistance and reliability of the cables.

The proposed cable is schematically shown in cross section in figures 1, 2. Figure 1 shows a communication cable of seven twisted pairs. Figure 2 is given a communication cable from one of the four. In the figures: 1 - a single-wire copper core, 2 - solid polyethylene insulation, 3 - twisted pair, 4 - hydrophobic aggregate, 5 - belt insulation, 6 - screen, 7 - grounding core, 8 - inner polymer sheath, 9-armor, 10 separation layer, 11 — protective polymer shell, 12 — star four.

The communication cable contains polyethylene insulated single-wire copper conductors 1 comprising pairs 3 or four, twisted into a core, on top of which a belt insulation 5, a shield 6, an inner polymer shell 8, an armor 9 and a protective polymer sheath 11 are sequentially applied. The armor 9 is made in the form of longitudinally applied overlapping corrugated coated steel tape coated with at least one inner layer of hydrophobic aggregate 4.

Example 1. The telephone cable (Fig. 1) contains single-wire copper conductors 1 with a diameter of 0.5 mm, insulated on an extruder with solid polyethylene insulation 2 and twisted into pairs 3. Then seven twisted pairs of 3 are twisted on a twisting machine with multidirectional twisting into a core onto which a fastening winding of synthetic filaments (not shown conventionally in FIG.) and belt insulation 5 of a polyethylene terephthalate film were applied in an open spiral. In the cable, over the belt insulation 5, a longitudinal screen 6 of aluminum-aluminum tape is laid with metal inward, and a tinned copper grounding conductor 7 (wire with a diameter of 0.4 mm) is laid under it, which increases the efficiency of shielding. The free space inside the core and over the belt insulation 5 is filled with a hydrophobic aggregate 4, which should be compatible with the insulation 2 of the cores 1 and other elements of the cable structure.

On top of the cable screen 6, an inner sheath 8 of polyethylene is applied, while the polymer layer is welded with it when the sheath is applied and the screen 6 becomes airtight at the overlap and is a moisture barrier.

Armor 9 is made in the form of longitudinally superimposed with overlapping corrugated tinned steel tape. Under the armor 9 and on top of it a hydrophobic filler 4 is applied. On the outer layer of the hydrophobic filler 4 on the armor 9 a spacer jar 10 of a polyethylene terephthalate film is applied. The cable is covered with a protective sheath 11 of polyvinylchloride plastic compound of reduced combustibility.

Example 2. Local communication cable high-frequency (figure 2) contains single-wire copper conductors 1 with a diameter of 0.9 mm insulated on the extruder by continuous polyethylene insulation 2. The insulated conductors 1 are twisted into a star four 12 (two conductors. located diagonally, form a working pair) and sequentially covered with belt insulation 5 in the form

extruded tube made of polyethylene, screen 6 of aluminum tape, superimposed overlapping and tinned copper wire 7 under it. The free space inside the core, that is, in the star quartet 12 and over the belt insulation 5 is filled with a hydrophobic aggregate 4.

Over the screen 6 of the cable imposed an inner sheath 8 of polyethylene. The armor 9 is made in the form of a longitudinally overlapping corrugated steel tape laminated on both sides. One inner layer of hydrophobic aggregate 4 is applied under the armor 9. A plastic shell 11 is applied over the armor 9, while the polymer layer is welded with it when the shell 11 is applied and the armor 9 becomes airtight at the overlap and is a moisture barrier.

Claims (9)

1. Communication cable containing polyethylene insulated single-wire copper conductors, comprising pairs or fours, twisted into a core, on top of which a belt insulation, a shield, an inner polymer sheath, armor and a protective polymer sheath are sequentially applied, characterized in that the armor is made in the form of longitudinally applied corrugated coated steel tape coated with at least one inner layer of hydrophobic aggregate. 2. The cable according to claim 1, characterized in that the screen is laid longitudinally from aluminum or from aluminum-polyethylene tape with metal inside, and a tinned copper grounding conductor is laid under it. 3. The cable according to claim 1, characterized in that the free space inside the core and over the belt insulation further comprises a hydrophobic aggregate. 4. The cable according to claim 1, characterized in that the steel corrugated tape is made with zinc coating or tinned. 5. The cable according to claim 1, characterized in that the steel corrugated tape is laminated on both sides. 6. The cable according to claim 1, characterized in that it further comprises, under the protective sheath, a separation layer of polymer film superimposed on the outer layer of the hydrophobic aggregate on the armor. 7. The cable according to claim 1, characterized in that the inner and protective sheaths are made of polyethylene. 8. The cable according to claim 1, characterized in that the protective sheath is made of low flammability polyvinyl chloride plastic compound. 9. The cable according to claim 1, characterized in that the protective sheath is made of PVC compound with low smoke and gas emission.