Electric wire

 

(57) Abstract:

The invention relates to a cable technique, namely, to designs of wires. The technical result consists in increasing the resistance to the spread of the electric arc and facilitating removal of insulation during installation with high mechanical and radiation stability. In the electric wire containing a conductive core and an insulation layer on a polyimide base isolation further comprises an inner layer previously formed on the conductive wire by passing it through aqueous suspension of PTFE and subsequent heat treatment, and the thickness ratio of the inner layer of insulation to the outside on a polyimide base is 1:25-1:6. table 2., 1 Il.

The invention relates to a cable technology, in particular to designs wires, designed for operation in conditions of high temperatures and high radiation.

In cable technology is widely used wire containing a conductive core and an insulation, which depending on what they use wire, made of different materials. As a rule, it must be heat-resistant, elastic is aprobadas conductor and the insulation of the inner layer, formed by PTFE tapes, namely polytetrafluoroethylene and an outer layer of fusible copolymer of tetrafluoroethylene with PERFLUORO(alkyl)vinyl esters [3]. This wire is reliable at high temperatures up to +250oC, cyclic impact and an electric voltage of 100 V, 50 Hz. However, wires with such isolation have low radiation resistance, low mechanical strength, are unsuitable for operation at low temperatures due to their ludoteques. The cold fluidity leads to the bursting of the insulating layer under the influence of mechanical loads even at low temperatures, and low mechanical strength to the necessity of applying an insulating layer of a thickness of not less than 0.2 - 0.3 mm, which increases the size and mass of the wire.

The closest device that solves the task of creating an electric wire with little insulation thickness and small in size and weight with high resolution, high mechanical strength, is an electric wire containing a conductive core and an insulation, which represents a polyimide film [4], for example, in the form printed on the core insulating polyimide varnish HELL-9103 on Twardoski, does not soften up to the decomposition temperature (400oC) due to their high mechanical strength can be used for wire insulation in the form of very thin layers of 0.05 - 0.1 mm), so the wires have small dimensions and weight, which is especially valuable for space and aviation technology.

However, these wires have low resistance to the spread of the electric arc along the length of the tow during its formation due to damage to the insulation of adjacent wires. Formed under high temperature conductive consobrina and gaseous products of decomposition (pyrolysis) help to maintain the arc and its distribution along the length collected in the wiring harness that could cause a fire in an electrical network. The arc extends at a voltage higher than 12V, which limits the operating voltage when the use of such wires despite the high dielectric strength. In addition, when Stripping during installation polyimide insulation, which, as a rule, is applied by applying a polyimide varnish on the surface of the conductors with a subsequent heat treatment, it is difficult is removed from the conductors due to high adhesion.

nosti to the distribution of the electric arc, facilitating removal of insulation during installation while maintaining all other positive properties of the wires, including radiation resistance and mechanical strength.

This technical result is achieved that the electric wire containing a conductive core and an insulation deposited on the core layer on a polyimide base isolation further comprises an inner layer previously formed on the conductive wire by passing it through aqueous suspension of PTFE and subsequent heat treatment, when the ratio of the thickness of the inner layer to the thickness of a layer on a polyimide base 1:25 - 1:6.

The drawing shows the proposed electric wire, where 1 - the conductors, 2 - inner insulation layer formed on the conductive wire by passing it through aqueous suspension of PTFE and the subsequent heat-treatment, 3 - outer layer on a polyimide base. Depending on the operating conditions of the electric wire and requirements for radiation resistance, mechanical strength ratio of the thickness of the layer 2 to the thickness of layer 3 is 1: 25 - 1:6.

For the manufacture of electric wires conductive core is passed through the installation with water susp is SUP>C. the Thickness of the inner layer, as a rule, corresponds to 0.01 - 0.015 mm, but can reach 0.04 mm and is governed by the number of passes the conductors through the bath with the suspension of PTFE and furnace for heat treatment. Then a conductive core with an already deposited layer of PTFE is passed through the camera amlici, where on its surface put a layer on a polymer basis, such as insulating varnish of polyimide brand AD-9103 beyond 6-19.283-85. The thickness of the insulation of the wires of this design is obtained 0,07 - 0,1 mm Since the thickness of the inner layer is much less than the thickness of the outer polyimide layer, an inner fluoropolymer layer has no significant effect on the strength and mechanical properties, including resistance to radiation, the electric wires of the proposed design does not increase the weight and dimensions of the wires, which is especially important when using them as wires in space and aviation technology.

Use wires of the proposed design allows you to extend the range of cross sections up to 0.5 mm (whereas in the prototype - to 0.35 mm), as it significantly increases the voltage distribution of the arc. All CSOs, in what conditions you expect to use electric wire, as well as the geometric dimensions of the wire, the ratio of the thickness of the layers (the inner bore to the outer polyimide) choose from 1: 25 to 1:6. Table 2 presents characteristics of the wires of the proposed design depending on the ratio of the thickness of the layers. The table shows that the execution of the outer insulation layer of a thickness of less than 6 times the thickness of the inner layer, is impractical because deteriorate the mechanical characteristics of the insulated wire due to insufficient thickness of the polyimide layer. Execution of the outer layer is thicker than 25 times the inner leads to unnecessary increase in the weight and size of the wire.

SOURCES OF INFORMATION

1. USSR author's certificate 1362917, CL H 01 7/02, 1987

2. USSR author's certificate 1775734, CL H 01 7/02, 1992

3. USSR author's certificate 1405590, CL H 01 7/02, 1995

4. Astacin Century. Century. and other "electrical Insulating varnishes) Chemistry, 1981, S. 97-106.

Electric wire containing a conductive core and an insulation deposited on the core layer on a polyimide base, characterized in that the isolation of additional sideswipes PTFE with a subsequent heat treatment, when the ratio of the thickness of the inner layer to the thickness of a layer on a polyimide base 1 : 25 - 1 : 6.

 

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