RU2662446C1 - Insulating screening shell - Google Patents

Insulating screening shell Download PDF

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Publication number
RU2662446C1
RU2662446C1 RU2017111600A RU2017111600A RU2662446C1 RU 2662446 C1 RU2662446 C1 RU 2662446C1 RU 2017111600 A RU2017111600 A RU 2017111600A RU 2017111600 A RU2017111600 A RU 2017111600A RU 2662446 C1 RU2662446 C1 RU 2662446C1
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RU
Russia
Prior art keywords
layer
polyimide
woven
insulating
threads
Prior art date
Application number
RU2017111600A
Other languages
Russian (ru)
Inventor
Марина Николаевна Арнольдт
Алексей Михайлович Зорин
Марина Викторовна Койда
Тамара Курмангазиевна Мусина
Марина Александровна Павленко
Надежда Васильевна Педченко
Ирина Викторовна Строева
Антон Андреевич Цветков
Original Assignee
Общество с ограниченной ответственностью "ЛИРСОТ"
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Priority to RU2017111600A priority Critical patent/RU2662446C1/en
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Publication of RU2662446C1 publication Critical patent/RU2662446C1/en

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Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B11/00Communication cables or conductors
    • H01B11/02Cables with twisted pairs or quads
    • H01B11/06Cables with twisted pairs or quads with means for reducing effects of electromagnetic or electrostatic disturbances, e.g. screens

Abstract

FIELD: electrical engineering.
SUBSTANCE: invention relates to the development of complex insulating shielding casings. Complex two-layer insulating screening sheath (braid) for electromagnetic and electrostatic screening of wires was developed, cables and harnesses, used in the installation of airborne cable networks of aircraft in aeronautical and space technology. Insulating shielding sheath is made of two-layer, where the inner layer is made of a thermo-resistant polyimide yarn entwined with a metallic thread, and the outer layer is made of a thermo-fireproof polyimide yarn.
EFFECT: shell has a low specific gravity, manufacturability in the manufacture and installation, high mechanical characteristics, resistant to radiation and other radiation, liquid fuel, oil products, oils, acids, organic solvents, microbiological effects.
11 cl

Description

Technical field

The invention relates to the development of complex insulating shielding shells (braids) with a number of specific properties: low specific gravity, ability to absorb, reflect or scatter electromagnetic radiation, resistance to high temperatures, open flame, manufacturability in the manufacture and installation, high mechanical characteristics, First of all, to abrasive loads, resistance to biological and climatic factors. Shell designs are based on an adjustable combination of organic fibrous materials with electrically conductive metal materials (thin and ultra-thin wire, flattening). Shells (braids) are designed for electromagnetic and electrostatic shielding of wires, cables and bundles used in the installation of aircraft cable networks in aircraft and space technology.

State of the art

A number of shielding insulating shells and braids (or methods for their manufacture) are known, consisting mainly of metal or tinsel threads, designed to improve the shielding of wires and cables from external electromagnetic influences, protecting cable networks from mechanical damage, high and low temperatures, which enable functioning products in confined spaces, the conditions of various climatic and energy fields.

A method for the manufacture of a shielding sheath of an electric wire or cable (patent RU 2299484 C1, IPC N01 B7 / 18, published on 05/20/2007, "Method for the manufacture of an insulating-shielding sheath"), including obtaining twisted threads by winding at least one metal shielding, is proposed wire (copper or bronze, or bimetal, or aluminum-magnesium alloy, or copper-clad aluminum, with an anti-corrosion coating, round or flat, with a diameter or thickness of 0.05-0.08 mm, respectively) on reinforcing wasps new from non-metallic fibers and weaving of a sheath of twisted threads with the subsequent removal (dissolution) of non-metallic fibers from the reinforcing base of twisted yarns woven into the sheath. The disadvantages of this method include the uneven surface density of the shielding shell resulting from the removal of the reinforcing component, which does not provide the shell with a sufficient degree of stability of the shielding, mechanical and thermophysical properties. The impossibility of creating a uniform density of the surface of the shell is also due to the interpenetration of the winding of adjacent twisted threads and the formation of hooks leading to breakage of the threads. Another disadvantage of this method is the low mechanical strength of individual twisted threads, leading to low mechanical strength of the entire shielding. A serious disadvantage of the proposed method is the need for solvent return, recovery of the soluble auxiliary product or its environmentally friendly disposal.

Known shielding braid (utility model RU 70406 U1, IPC H01B 11/06, publ. 01/20/2008 "Shielding braid"), formed by weaving light and resistant to oxidation of aluminum metal wire with a nickel or silver coating, or tinsel yarn obtained by winding specified metal wire onto a thin synthetic polymer thread. The nature of the synthetic thread, as well as its physico-mechanical and thermal characteristics are not indicated, it is also not clear whether this thread remains in the final product.

A tinsel thread is described (utility model RU 52516 U1, IPC Н01В 11/06, published March 27, 2006. “Tinsel thread”), consisting of aramid fiber wrapped in round or flattened copper wire coated with tin or silver for the manufacture of shielding braids . However, in the process of producing domestic aramid yarns, one of the by-products is hydrogen chloride, which leads to noticeable corrosion of all metal elements in contact with aramid yarns, and it is difficult to fully implement the special stage of neutralization of hydrogen chloride in practice. In addition, aramid fibers are subject to fairly rapid aging with a significant change in mechanical and thermophysical properties, as well as destruction with the release of smoke and gas when exposed to an open flame and high temperatures from + 250 ° C.

A shielding braid was developed (utility model RU 101859 U1, IPC Н01В11 / 06, published on 01/27/2011 “Shielding braid”), in which a metal wire (mainly made of copper coated with silver, bronze coated with silver, or aluminum layer-coated zinc, copper and silver) with a diameter of 0.03-0.12 mm braids the carrier - a hollow tube or a cylindrical rod of a certain constant diameter of polymeric materials. This braid is made in one or more layers of homogeneous or dissimilar materials. The use of a second or more layer of metal wire leads to difficulties in the manufacture and high weight of the braid.

In the patent for utility model RU 151150 U1, IPC H05K 9/00, publ. 03/20/2015 “Shielding braid” presents a braid in which the strands of the first direction of the wire are made of composite metal wires and the counter-strands are made of another material (metal materials, as well as plastic polymeric materials, natural or synthetic threads), different directions can be of different thicknesses, and the metal coating of strands of any direction with a thickness of 0.003 mm or more is made of silver, nickel, tin or tin-lead solder. However, the use of this braid does not always give the necessary shielding characteristics, since the conductive strands in such braids are exactly half and the electrical conductivity is often insufficient for effective shielding, or there is no necessary sufficient resistance to mechanical stress, shock, abrasion, bending, as strands of metal wires not protected from possible mechanical damage.

Known insulation-shielding sheath (utility model RU 47568 U1, IPC НВВ 7/17, publ. 08/27/2005, "Insulating-shielding sheath") with a reinforcing base of basalt fibers, entwined with a shielding metal wire made of copper or bronze or with copper a shell with an anti-corrosion coating, round or in the form of a flatten with a diameter or thickness of 0.05-0.08 mm, respectively. However, basalt threads are highly brittle and brittle, followed by the release of dust that has a fibrogenic effect on humans, which is especially unacceptable in confined spaces and especially weightlessness.

The use of basalt, as well as quartz and silica fiber as the supporting base of a tinsel thread entwined with a metal wire of nickel or nickel alloys is described in utility patent RU 111710 U1, IPC Н01В 11/06, publ. December 20, 2011. “Tinsel thread”. Visible disadvantages of the proposed tinsel yarn, along with those indicated with respect to utility model RU47568, are the high weight characteristics of basalt and ceramic yarns, which may limit their use in aircraft.

The material described in the patent for utility model RU 168930 U1, IPC Н01В 9/02, Н05K 9/00, publ. 02.28.2017, “Protective braid”, is a braid obtained by weaving plastic or synthetic or glass filaments with a metal coating and without it at a crossing angle of 30 ° to 80 °, while strands of different directions can be made of different materials and different thicknesses. The specified braid is worn over metal braids to protect against mechanical stress, high and low temperatures without a noticeable increase in weight. The proposed solution carries with it both ergonomic and operational flaws. Lack of ergonomics is associated with the difficulty of mechanically “dressing” the finished outer shell on the shielding, especially for very long structures. Also, due to “dressing”, the extension of metal wires of the inner shielding shell is almost inevitable, leading to a decrease in the effectiveness of electromagnetic protection.

The closest analogue (prototype) of the invention is a shielding insulating sheath (patent RU 2270489 C2, IPC НВВ 7/18, НВВ 7/02, НВВ 9/02, НВВ 3/48, publ. 02.20.2006, “Insulating shell”), light and flexible, with increased electrical insulation, mechanical and thermal characteristics, resistant to open flames, high temperatures up to + 600 ° C, acids, oil products, organic solvents, microbiological influences. The insulating shell consists of threads of different composition twisted together, one of the threads is made of aramid fiber and is a reinforcing base, and the second is made in the form of a metal thread with a thickness of 0.018-0.020 mm and is a shielding element. As a shielding element, a metal wire with or without coating is used. The reinforcing base is made in the form of a bundle of at least two aramid threads twisted together. The insulating shell contains several pairs of twisted together threads of aramid fiber and metal thread, while the pairs are woven into a tape or cloth.

Disclosure of invention

The aim of this invention is to provide a comprehensive lightweight and flexible, as well as technologically advanced in the manufacture and installation of an insulating shielding sheath, capable of effectively protecting a functional product (wire or cable) both from external electromagnetic effects and from external adverse factors (elevated temperatures, open flame, abrasive loads, mechanical damage, biological and climatic factors).

The problem is solved due to the fact that the shell is made of a two-layer of different composition of threads.

The first layer of the sheath (inner) is made of a heat-resistant polyimide thread entwined with a round or rolled metal thread. The metal thread is made with a diameter or thickness of 0.015-0.020 mm in its pure form or with a coating and is a shielding element. Polyimide yarn is a reinforcing base and is made of multifilament yarns of linear density from 3 to 100 tex. Polyimide yarns entwined with metal yarns are built together and woven into a ribbon or woven into a fabric.

The second layer of the shell (outer) is made of heat-resistant polyimide yarn of linear density from 3 to 100 tex. The outer layer may be made of single polyimide filaments or at least two polyimide filaments mated between each other. Several pairs of polyimide filaments woven together are woven into a ribbon or woven into a fabric.

The implementation of the invention

The manufacture of an insulating shielding sheath includes the following operations. On rewinding equipment, polyimide yarns entwined with metal yarn are wound with simultaneous trimming on packages for cord-braiding machines. Then, on a braiding machine, a screening sheath is woven - the first inner layer, which is directly fed to the next braiding machine, where the outer surface is braided with a second outer layer of one polyimide yarn or polyimide strands mated between each other.

The complex insulating shell is resistant to radiation and other radiation, liquid fuel, oil products, oils, acids, organic solvents, microbiological influences, has a low coefficient of thermal conductivity, withstands open flame and heat shock with a temperature of + 600 ° C, and due to the second layer up to + 900 ° C.

Claims (11)

1. An insulating shielding sheath made of threads of different composition, characterized in that the sheath is two-layered, where the first layer (inner) is made of heat-resistant polyimide yarn wrapped with metal thread, and the second layer (outer) is made of heat-resistant polyimide yarn.
2. The insulating shell according to claim 1, where the inner layer is made of filaments of different composition, polyimide and metal, characterized in that one of the threads is a reinforcing base, made of polyimide threads, and the second is a shielding element and is made in the form of a round or flattened metal thread with a diameter or thickness of 0.015-0.020 mm in its pure form or coated.
3. The insulation shell according to paragraphs. 1 and 2, characterized in that the reinforcing base of the inner layer is made of complex threads of linear density from 3 to 100 tex.
4. The insulation shell according to any one of paragraphs. 1-3, characterized in that the inner layer contains several polyimide filaments entwined with metal threads, chopped together.
5. The insulation shell according to any one of paragraphs. 1-4, characterized in that the strands mated between themselves are woven into a ribbon.
6. The insulating sheath according to claim 5, characterized in that the yarns weaved between each other are woven into a fabric.
7. The insulating sheath according to claim 1, characterized in that the outer layer is made of a heat-resistant polyimide yarn of linear density from 3 to 100 tex.
8. The insulation shell according to paragraphs. 1 and 7, characterized in that the outer layer is made of one or at least two polyimide yarns that are chopped together.
9. The insulation shell according to any one of paragraphs. 1, 7, 8, characterized in that it contains several pairs of polyimide filaments mated between each other.
10. The insulation shell according to any one of paragraphs. 1, 7, 8, 9, characterized in that several pairs of polyimide strands woven together are woven into a ribbon.
11. The insulating sheath according to claim 10, characterized in that several pairs of polyimide filaments woven together are woven into a fabric.
RU2017111600A 2017-04-06 2017-04-06 Insulating screening shell RU2662446C1 (en)

Priority Applications (1)

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RU2662446C1 true RU2662446C1 (en) 2018-07-26

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2713640C1 (en) * 2019-07-10 2020-02-05 Общество с ограниченной ответственностью "ЛИРСОТ" Insulating screening sheath

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU50336U1 (en) * 2005-06-21 2005-12-27 Открытое Акционерное Общество Всероссийский научно-исследовательский , проектно-конструкторский и технологический институт кабельной промышленности (ВНИИ КП) Mounting wire
RU2270489C2 (en) * 1999-11-02 2006-02-20 Ооо "Лирсот" Insulating sheath
US9520210B1 (en) * 2013-06-13 2016-12-13 Superior Essex Communications Lp Shielded twisted pair communication cables
RU168930U1 (en) * 2015-05-26 2017-02-28 Максим Евгеньевич Рябков Protective braid

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2270489C2 (en) * 1999-11-02 2006-02-20 Ооо "Лирсот" Insulating sheath
RU50336U1 (en) * 2005-06-21 2005-12-27 Открытое Акционерное Общество Всероссийский научно-исследовательский , проектно-конструкторский и технологический институт кабельной промышленности (ВНИИ КП) Mounting wire
US9520210B1 (en) * 2013-06-13 2016-12-13 Superior Essex Communications Lp Shielded twisted pair communication cables
RU168930U1 (en) * 2015-05-26 2017-02-28 Максим Евгеньевич Рябков Protective braid

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2713640C1 (en) * 2019-07-10 2020-02-05 Общество с ограниченной ответственностью "ЛИРСОТ" Insulating screening sheath

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