RU204917U1 - CABLE FOR CONTROL AND CONTROL CIRCUITS - Google Patents

Abstract

The claimed technical solution relates to cable technology, namely to the design of electrical cables, mainly for control and monitoring circuits. In an electrical cable containing insulated conductive cores, on top of which belt insulation, a screen and a sheath made of a thermoplastic halogen-free material based on a polymer composition are sequentially applied. And under this shell is a thread, which, during installation or repair, is used to cut this shell. In this case, the current-carrying conductors can be individually marked on the insulation, for example, containing the digital number of the insulated conductor in the elementary beam and the digital number of the elementary beam.

Description

The utility model relates to cable technology, in particular to the design of electrical cables, mainly for control and monitoring circuits, designed to connect measuring transducers and test mechanisms to the software and hardware of automatic process control systems, as well as for fire protection systems.

Known cable for control and monitoring circuits, which contains conductive cores insulated with thermoplastic halogen-free material based on a polymer composition, twisted into pairs, which are twisted into elementary four-pair bundles, twisted in turn into a core, on top of which a belt insulation is sequentially applied, a screen made of alumopolymer tapes and sheath made of thermoplastic halogen-free material based on polymer composition (RF patents for useful model No. 83875 and No. 99239).

These cables have an ordered structure of the cable core and the colors of the insulation of conductive conductors, which reduces the time spent on installation and control work.

A significant disadvantage of such a cable is the complexity of removing the cable sheath, which is necessary for installation and repair work, as well as the quick identification of conductive conductors.

The task was to develop a cable for control and monitoring circuits, which allows accelerating repair and installation work without the use of additional technical means spent on removing insulation and identifying (ringing) conductive conductors.

The technical result is achieved by the fact that in an electric cable containing insulated conductive cores, on top of which belt insulation, a screen and a sheath made of a thermoplastic halogen-free material based on a polymer composition are sequentially applied, and under this sheath there is a thread that is used during installation or repair to cut this shell. In this case, the current-carrying conductors can be individually marked on the insulation, for example, containing the digital number of the insulated conductor in the elementary beam and the digital number of the elementary beam.

The design of the inventive cable for control and monitoring circuits (hereinafter referred to as the cable) in section is illustrated by images in Fig. 1 - Fig. 4;

figure 1 and figure 3 - cable for control and monitoring circuits of various designs with two conductive cores;

figure 2 is a cable containing 32 conductive cores; figure 4 - 8 conductive cores, respectively, where:

1 - conductive cores,

2 - insulation made of polymer composition,

3 - belt insulation made of polymer material,

4 - thread for cutting the shell,

5 - screen,

6 - a shell made of a polymer composition that does not contain halogens,

7 - a layer of glass tape,

8 - mica tape,

9 - winding with alumopolymer tape.

DESCRIPTION OF THE CLAIMED TECHNICAL SOLUTION

In a preferred embodiment, the current-carrying conductors 1 are made of stranded copper or tinned copper wires, and their insulation 2 is made of a thermoplastic halogen-free material based on a polymer composition. Insulated conductors are twisted in pairs. The pairs, in turn, can be twisted into four-pair bundles, which, in turn, are twisted into a core.

On top of them, a belt insulation 3, a screen 5 and a sheath made of a thermoplastic halogen-free material based on a polymer composition 6 are sequentially applied.

Under the shell there is a thread for cutting the shell from the inside 4, which is selected on the basis of the following requirement: the specific strength of the thread must be at least 2.3 kN / mm ² , and the ratio of the thread diameter to the shell thickness should be in the range from 0.04 to 2.

In a preferred embodiment, the thread for cutting the sheath from the inside has:

- diameter 0.4 ± 0.1 mm,

- tensile strength ≥300 N,

- elongation at break - 2.00-4.40%.

The cable sheath material made of a thermoplastic halogen-free material based on a polymer composition is characterized by a strength of at least 9 N / mm ² .

In one embodiment, the cable may have a thermal barrier made of mica tape over each conductive strand.

In other versions, the cable can have a glass tape or glass-mica tape winding over the belt insulation or as a belt insulation.

Also, the cable can have a screen made of alumopolymer tape or in the form of a braid made of copper or tinned copper wires.

The cable manufacturing technology is based on the use of industrial cable equipment and is as follows.

The conductive conductor supplied to the insulating section is insulated from a thermoplastic halogen-free material based on a polymer composition. Simultaneously with the imposition of insulation, if the cable contains elementary bundles, an individual marking is applied containing the digital number of the insulated conductor in the elementary bundle and the digital number of the elementary bundle.

Then the insulated conductors with individual markings applied on the surface of the insulation are twisted into pairs, which, in turn, can be twisted into four-pair bundles, which, in turn, are twisted into a core, on top of which belt insulation and a screen are successively applied.

On top of the screen, a sheath made of a thermoplastic halogen-free material based on a polymer composition is applied; simultaneously with the imposition of the sheath, a para-aramid thread is brought under the sheath to cut the sheath from the inside.

Examples of cables.

Example 1. Cable with the number of pairs equal to 2 pcs. (see Fig. 1).

The cable for control and monitoring circuits in Fig. 1 contains stranded conductors 1, the conductors are covered with insulation from a polymer composition that does not contain halogens 2. Insulation of a thermoplastic, halogen-free material based on a polymer composition is applied to the current-carrying conductor supplied to the insulating section; simultaneously with the insulation application, an individual marking is applied containing the digital number of the insulated conductor in the elementary beam and the digital number of the elementary beam. Insulated conductors, 2 pcs. are individually marked on the surface of the insulation - "1" and "2".

The insulated conductors with the applied markings are twisted into a pair, belt insulation 3 and screen 5 in the form of a winding made of alumopolymer tape are sequentially applied on top.

On top of the screen, a 1.0 mm thick sheath 6 made of a thermoplastic halogen-free material based on a polymer composition is applied, while the sheath is applied under the sheath, a thread 4 of para-aramid with a diameter of 0.3 mm is allowed to cut the sheath from the inside.

Example 2. Cable with the number of pairs equal to 16 pcs. (see Fig. 2).

Figure 2 shows a cable containing 32 conductive cores 1, each of which is covered with insulation 2 made of a polymer composition that does not contain halogens, which are then twisted into elementary bundles, which, in turn, are twisted into a core.

On the conductive core 1 supplied to the insulating section, insulation is applied from a thermoplastic halogen-free material 2 based on a polymer composition, simultaneously with the application of insulation, an individual marking is applied along the surface of the insulation containing the digital number of the insulated core in the elementary beam and the digital number of the elementary beam (see Appendix - Table one). Insulated conductors with printed markings are twisted in 16 pairs, which, in turn, are twisted in 4 elementary four-pair bundles. Elementary beams are twisted into a core, on top of which belt insulation 3 and a screen 5 in the form of a braid of tinned copper wires are sequentially applied. On top of the screen, a shell 6 with a thickness of 1.7 mm made of a thermoplastic halogen-free material based on a polymer composition is applied, simultaneously with the imposition of the shell 6, a thread 4 of para-aramid with a diameter of 0.4 mm is allowed under the shell to cut the shell 6 of a polymer composition that does not contain halogens from the inside ...

Example 3. Cable with the number of pairs equal to 2 pcs. (see Fig. 3).

The conductive conductor 1 supplied to the insulating section is insulated from a thermoplastic halogen-free material based on polymer composition 2, while the insulation is applied, an individual marking is applied containing the digital number of the insulated conductor in the elementary beam and the digital number of the elementary beam. Insulated conductors, 2 pcs. are individually marked on the surface of the insulation - "1" and "2".

The insulated conductors with the applied markings are twisted into a pair, belt insulation 3, winding with glass tape 7 and screen 9 in the form of a winding made of alumopolymer tape are sequentially applied on top. On top of the screen, a 1.0 mm thick sheath 6 made of a thermoplastic halogen-free material based on a polymer composition is applied, while the sheath is applied under the sheath, a thread 4 of para-aramid with a diameter of 0.3 mm is allowed to cut the sheath from the inside.

Example 4. Fire-resistant cable with the number of pairs equal to 4 pcs. (see Fig. 4).

On the conductive core 1 supplied to the winding section, a mica-containing tape 8 is applied by winding, then insulation 2 of a thermoplastic halogen-free material based on a polymer composition is applied on top. Insulated conductors are twisted into 4 pairs, which, in turn, are twisted into a core, over which belt insulation 3 and screen 5 are sequentially applied in the form of a braid of tinned copper wires. On top of the screen 5, a shell 6 with a thickness of 1.7 mm is applied, made of a thermoplastic, halogen-free material based on a polymer composition; simultaneously with the imposition of the shell, a thread 4 of para-aramid with a diameter of 0.4 mm is allowed under the shell to cut the shell from the inside.

Claims (10)

1. Cable for control and monitoring circuits, containing conductive conductors insulated with thermoplastic halogen-free material based on polymer composition, twisted into pairs, belt insulation, screen and sheath made of thermoplastic halogen-free material based on polymer composition are sequentially applied over them, characterized in that under the sheath there is a thread for cutting the shell from the inside, made with a specific strength of at least 2.3 kN / mm ² , while the ratio of the thread diameter to the shell thickness is in the range from 0.04 to 2. 2. Cable according to claim 1, characterized in that the thread is made of para-aramid. 3. A cable according to claim 1, characterized in that it contains two insulated conductors twisted into pairs. 4. A cable according to claim 1, characterized in that it contains insulated conductors twisted into pairs, which are then twisted into elementary bundles, which, in turn, are twisted into a core. 5. A cable according to claim 1, characterized in that the insulated conductors are individually marked on the insulation, containing the digital number of the insulated conductor in the elementary beam and the digital number of the elementary beam. 6. A cable according to claim 1, characterized in that the conductive cores are multi-wired. 7. A cable according to claim 1, characterized in that the conductors are made of tinned copper wires. 8. The cable according to claim 1, characterized in that a thermal barrier made of a mica tape is made over each conductive multi-wire core. 9. A cable according to claim 1, characterized in that it has a winding of glass tape or glass-mica tape over the belt insulation. 10. The cable according to claim 1, characterized in that the screen is made of an alumopolymer tape or in the form of a braid of copper or tinned copper wires.

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