RU169723U1 - INSTALLATION ELECTRICAL WIRE - Google Patents

Abstract

The utility model relates to the field of the electrical industry and can be used as a mounting wire for the transmission of electricity and signals from the airborne cable network of aircraft. and, as a consequence, the diameter and mass of the wire. The technical result is achieved by the fact that the mounting electrical wire contains a multi-wire conductive core coated with insulation from extruded radiation-stitched fluoroplastic, while the multi-wire conductive core is calibrated. 4 s.p. f-ly, 3 ill.

Description

The utility model relates to the field of the electrical industry and can be used as a mounting wire for the transmission of electricity and signals from the airborne cable network of aircraft.

There are known designs of electric wires used to build an on-board cable network in which fluoropolymer insulation from fluoropolymers is used as insulation, for example, wires of MS 15-18 TU 16-705.199-81 with insulation from a copolymer of tetrafluoroethylene with hexafluoropropylene (aka fluorinated ethylene-propylene (FEP) )). The design of this wire allows for an acceptable weight of the onboard cable network, including spacecraft and launch vehicles. At the same time, the low resistance of the FEP insulation to mechanical stresses reduces the reliability of the onboard cable network.

Known on-board aircraft electrical wire containing a multi-wire tinned copper conductive core coated with insulation consisting of polymidofluoroplastic and polytetrafluoroethylene layers (see RU 2278433 C1, publ. 06/20/2006).

A disadvantage of the known wire is that its insulation is not flexible enough and arc resistant.

The closest analogue of the claimed utility model is an airborne aircraft electrical wire containing a multi-wire tinned copper conductive core coated with insulation from extruded radiation-crosslinkable (radiation-modified) fluoroplastic, which preferably uses a radiation-crosslinkable tetrafluoroethylene copolymer with ethylene (prototype, utility model RF No. 12.20063110 published: 05/10/2007).

The insulation can be double-layer with a thickness of the first and second layers of 0.11 and 0.13 mm, respectively (total insulation thickness of 0.24 mm).

The insulation material allows to reduce the insulation thickness, increase the resistance of the insulation to punching and increase the arc resistance of the wire, i.e. the ability to extinguish an electric arc (resist the spread of an arc discharge).

The manufacturing technology of the wire includes irradiation of a radiation-crosslinkable (radiation-modified) tetrafluoroethylene-ethylene copolymer, as a result of which the insulation stiffness increases.

A disadvantage of the known wire is the instability of the insulation thickness associated with possible defects in the conductive core, for example, such as “buckling” of wires, the instability of the diameter of the wires entering the core and the core itself (Fig. 1 - ordinary core).

As can be seen from FIG. 1 in the place of "bulging" of the wire (item 1), the insulation thickness will be less than in other places around the perimeter of the conductive core, respectively, a weak spot appears in the wire insulation system. The thickness of the insulation directly affects the electrical strength of the insulation and can lead to premature failure of the wire (electrical breakdown of the insulation). Accordingly, to ensure a normalized minimum value of the insulation thickness N, it is necessary to impose an insulation layer with a margin from the nominal (or minimum) value, which leads to an increase in the insulation thickness and, accordingly, the dimensions and mass of the wire.

The technical task of the utility model is to improve the design of the wire, aimed at reducing the size and weight of the wire.

The technical result is a decrease in the thickness of the insulation of the wire and, as a consequence, the diameter and mass of the wire.

The technical result is achieved by the fact that the mounting electrical wire contains a multi-wire conductive core coated with insulation from extruded radiation-crosslinkable fluoroplastic, while the multi-wire conductive core is calibrated.

Traditionally, an electrical installation wire is made in the following way: a multi-wire conductive core is twisted from 7 or 19 wires of the same diameter, then a fluoropolymer copolymer is extruded onto the conductive core and subjected to irradiation in radiation installations or an electron particle accelerator.

The problem is solved in that a multi-wire conductive core additionally (after twisting) passes through a system of calibers to stabilize the geometric dimensions (diameter of the conductive core).

The caliber is a drag, geometry and material, which is selected depending on the design and material of the conductive core.

A sketch of the die is shown in figure 2.

In FIG. 2: I - inlet fluff; II - lubrication cone; III - working cone; IV - calibrating zone; V - output fluff.

The result is a calibrated conductive core of the same diameter over the entire length with an almost perfect surface without “bulging” wires and other defects arising from the twisting operation (In Fig. 3 - calibrated core).

A calibrated conductive core allows you to apply a thin layer of insulation from fluoropolymers, that is, reduce the thickness of the insulation of the wire and, accordingly, the dimensions and mass of the wire.

Calibrated conductive core can be made of nickel-plated copper, silver-plated or tinned wires.

The insulation thickness of the developed wire is from 0.07 to 0.11 mm.

A comparative table of the characteristics of the developed wire with a calibrated core and the used wire of MS 15-18 TU 16-705.199-81 with a nominal cross section of 0.20 mm ^{2 is} given below.

From table 1 it is seen that the calibrated conductive core allows you to apply a thin layer of insulation from fluoropolymers, which reduces the size and weight of the wire.

The claimed technical solution meets the criterion of "novelty", as from the well-known and publicly available sources of information have not identified a similar technical solution.

The claimed technical solution meets the criterion of "industrial applicability", as it can be made from known materials and by known methods.

Claims (5)

1. Installation electric wire containing a multi-wire conductive core coated with insulation from extruded radiation-crosslinkable fluoroplastic, characterized in that the multi-wire conductive core is calibrated. 2. An electrical wire according to claim 1, characterized in that a copolymer of tetrafluoroethylene with ethylene is used as the radiation-crosslinkable fluoroplastic. 3. The mounting electrical wire according to claim 1, characterized in that the calibrated conductive core is made of nickel-plated copper wires. 4. The mounting electrical wire according to claim 1, characterized in that the calibrated conductive core is made of silver-plated copper wires. 5. The mounting electrical wire according to claim 1, characterized in that the calibrated conductive core is made of tinned copper wires.

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