RU63593U1 - ONBOARD WIRE WITH COMBINED INSULATION - Google Patents

Abstract

The utility model relates to the cable industry of the electrical industry and can be used for fixed installation of the onboard electrical network of aircraft. The developed wire has high adhesion between the insulation layers and the absence of adhesion to the conductive core, this is ensured by good adhesion during sintering of the fluoroplastic coating of the polyimide film with the raw calendared fluoroplastic film and the absence of adhesion between the conductor and the polyimide film. The use of on-board wires with combined insulation allows to obtain small-sized wires with monolithic insulation, ensures operability in operation during the entire service life.

Description

The utility model relates to the cable industry of the electrical industry, namely to designs of nickel-plated copper and silver-plated round wires with film insulation, which are mainly used in the fixed installation of the onboard electrical network of aircraft.

Analogs of development can be considered an on-board wire type BIF (TU 16-505.945-76), which has a design: a core of nickel-plated copper or silver wires, three tapes of a polyimide film with a fluoroplastic coating are used as insulation material.

On-board wires for fixed installation of the on-board electrical network are mainly made with film insulation. The films are required to elongate at break, dielectric strength, volume resistivity, adhesive strength. High elongation at break is necessary in order to ensure that there are no breaks when applying insulation to the wire with the necessary tension and during bending of the insulated wire during operation. Electrical characteristics determine the performance of the wires when exposed to various mechanical, climatic factors [1].

The developed wire has a conductive copper nickel-plated or silver-silver core, two-layer insulation: the first layer is a polyimide film with a fluoroplastic coating, the second layer is a fluoroplastic film.

The advantage of development is:

- electrical parameters not lower with a smaller insulation thickness;

- higher working temperature;

- smaller insulation thickness;

- less weight;

- reducing the cost of wires due to the use of whiter cheaper materials;

- good adhesion between the insulation layers and no adhesion to the conductor, which facilitates wire cutting during installation.

Comparative characteristics of the on-board wire with a cross section of 0.50 mm ² of the BIF type and the developed wire in table 1

Table 1 Name of indicator on-board wire type BIF TU 16-505.945-76 Designed wire Mass of wire, kg / km 6.80 5.76 Nominal Outer Diameter mm 1.46 1.34 insulation thickness, mm 0.28-0.34 0.22 Shrinkage values of linear dimensions of insulation, mm, not more than 3 one Working temperature ° C from minus 60 to plus 200 from minus 60 to plus 260 Elasticity elastic more elastic The effect of low temperature in the conditions of fixed installation at a temperature of minus 60 ° C:
- test with alternating current voltage, frequency 50 Hz before test 2200 V Sustained Sustained after testing 1500 V Sustained Sustained

The figure (figure 1) shows a General view of the wire. Two layers of insulation are applied on a round nickel-plated copper or silver-plated conductive core (1) by winding: the first layer is a polyimide film with a fluoroplastic coating (2), the second layer is a fluoroplastic film (3).

The use of onboard wires with combined insulation allows to obtain small wires with monolithic insulation. This design of the wire ensures operability during operation during the entire service life in the conditions of a difficultly deformed state (multiple bending).

The main factor of economic efficiency is: reducing the cost of wires due to the use of whiter cheaper materials and a smaller thickness of insulation.

List of used literature:

1. Kranikhfeld L. I. .. "Installation wires for electronic equipment", Energy, M, 1973.

Claims (1)

The side wire with combined insulation containing a round copper nickel-plated or silver-plated conductive core has a two-layer insulation, characterized in that the insulation is made: the first layer is a polyimide film with a fluoroplastic coating, the second layer is a fluoroplastic film.