Airborne thin-wall high-temperature-resistant flexible cable

Abstract

The utility model relates to a cable, and aims to provide an airborne thin-wall high-temperature-resistant flexible cable which has the characteristics of light weight, high flexibility and high tensile strength. According to the technical scheme, the airborne thin-wall high-temperature-resistant flexible cable comprises a cable core, and a belting layer, an inner shielding layer, an outer shielding layer and an outer protection layer which sequentially wrap the cable core from inside to outside; the cable is characterized in that the cable core comprises a plurality of leads, drainage wires and filling wires which are arranged in parallel along the length direction of the cable; each wire comprises a conductor and an insulating layer wrapping the conductor.

Description

Technical Field

[0001] The utility model relates to a cable, in particular to an airborne thin-wall high-temperature resistant flexible cable. Background Art

[0002] With the rapid development of the aerospace field, the requirements for the use of wires and cables are getting higher and higher. In addition to meeting the basic electrical performance requirements, they also need to meet the requirements of small size, light weight, high mechanical strength, high tensile strength, high reliability, high temperature resistance, resistance to various aerospace oils, and various extremely complex and harsh environments. In the fields of aviation and aerospace, the weight of cables has always been the focus of attention, and weight reduction has always been an eternal theme in this field. Wires and cables need to be moved and laid in large areas such as onboard cabins, so the cables need to be softer and more tensile, and the products should be more suitable for equipment in areas with small laying space and high bending requirements.

[0003] Therefore, how to improve the softness, weight reduction and high tensile strength of aerospace cables is of great practical significance. Utility Model Content

[0004] The purpose of the utility model is to overcome the deficiencies in the above-mentioned background technology and to provide an airborne thin-walled high-temperature resistant flexible cable, which has the characteristics of light weight, high flexibility and high tensile strength.

[0005] The technical solution provided by the utility model is:

[0006] A thin-walled, high-temperature-resistant, flexible cable for airborne use: comprising a cable core and a tape layer, an inner shielding layer, an outer shielding layer and an outer sheath which sequentially cover the cable core from the inside out; characterized in that: the cable core comprises a plurality of wires, a drainage wire and a filling wire which are arranged in parallel along the length direction of the cable; the wire comprises a conductor and an insulating layer covering the conductor.

[0007] The conductor is a plurality of twisted copper wires with coating.

[0008] The inner shielding layer is a plated metal copper wire braided layer;

[0009] The outer shielding layer is a silver-plated aramid silk braided layer;

[0010] The insulating layer and the sheath are both ultra-flexible cross-linked ethylene-tetrafluoroethylene material layers; the thickness of the insulating layer is 0.13-0.20 mm; the thickness of the outer sheath is 0.13-0.30 mm.

[0011] The drain wire is a multi-stranded soft copper conductor plated with silver, tin or nickel, and is covered with a soft cross-linked ethylene tetrafluoroethylene insulation layer;

[0012] The diameter of the plated metal copper wire is 0.08-0.10 mm, and the diameter of the aramid wire is 150D or 250D.

[0013] The filler wire is a solid cross-linked ethylene tetrafluoroethylene material.

[0014] The wrapping tape layer is a double-layer wrapping structure of high-temperature resistant polyimide wrapping and polyimide / aluminum-plastic tape wrapping.

[0015] The beneficial effects of the utility model are:

[0016] The utility model adopts multiple strands of soft conductor filaments to be twisted together by concentric compression; compared with the conventional concentric twisted conductor, the single filament is thinner and the number of strands is greater, and the conductor roundness is improved compared with the conventional concentric twisted conductor by adopting the method of twisting and compressing multiple strands, and the softness of the conductor itself is greatly improved, and the bending radius can be smaller;

[0017] The insulation layer and sheath are made of ultra-soft cross-linked ethylene tetrafluoroethylene extrusion: the material is less hard than the general cross-linked ethylene tetrafluoroethylene material, which can not only extrude a thinner insulation layer, but also reduce the outer diameter of the cable, reduce the weight of the cable and make it softer;

[0018] The tape layer + shielding layer is a combination of polyimide / aluminum-plastic tape + braided wire with coating + silver-plated high-strength aramid wire, which can improve the roundness of the cable and the overall tensile strength of the product, and has strong resistance to electromagnetic interference and electrostatic interference, ensuring the shielding efficiency, tensile resistance, and flexibility of the cable, and achieving the effect of weight reduction. In addition, the cable volume is greatly reduced (36% smaller than the outer diameter of conventional products), the cable weight is reduced (50% lighter than conventional products), and the bending radius is fixed for laying and can be bent to its own radius value (1D), which is more conducive to installation and laying in narrow spaces. While improving the bending performance of the cable, it provides a guarantee for weight reduction of aerospace vehicles and installation and laying in complex environments.

[0019] The additional drainage line is used to protect the cable and the equipment connected to it from lightning strikes or static electricity interference. When the charge inside the cable is unbalanced, static electricity will gradually accumulate and eventually be released in the form of lightning. This static electricity is carried away from the inside of the cable to avoid damage to the cable or adverse effects on the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of embodiment 1 of the present utility model.

[0021] Reference numerals: drain wire 1 , conductor 2 , insulation layer 3 , tape layer 4 , inner shielding layer 5 , filling wire 6 , outer shielding layer 7 , outer sheath layer 8 . DETAILED DESCRIPTION

[0022] The following is a further detailed description in conjunction with the embodiments shown in the accompanying drawings.

[0023] The airborne thin-walled, high-temperature resistant, flexible cable shown in the accompanying drawings comprises a cable core and a tape layer, an inner shielding layer, an outer shielding layer and an outer sheath which sequentially cover the cable core from the inside out; the cable core comprises a plurality of wires, drainage wires and filling wires arranged in parallel along the length of the cable (four wires + four drainage wires are shown in the figure); the wires comprise a conductor and an insulating layer covering the conductor.

[0024] The conductor includes a plurality of strands of fine wires twisted together. The copper wire is a silver-plated (tin, nickel) copper wire. The outer diameter of the single wire of the copper wire is 0.08 ～ 0.12mm, the coating thickness is ≥1μm, which complies with GJB1640A. Therefore, the outer diameter of the conductor is at least 0.2mm smaller than that of the conventional conductor, which not only plays a certain role in reducing the weight of the finished cable but also greatly improves the overall curvature.

[0025] like Figure 1 As shown, the conductor is a coated metal wire, which is formed by twisting multiple strands of thin wires tightly (layered 2 ～ The same core is twisted three times with adjacent layers twisted in opposite directions, which is an existing process). Considering the flexibility requirements, a multi-conductor structure is adopted, with the number of conductors being 665, 1045, 1665..., which has better roundness from the perspective of physical arrangement structure.

[0026] The drain wire is also made of a multi-strand soft conductor structure, with a soft cross-linked ethylene tetrafluoroethylene material coated on the outer layer. Adding a drain wire to the cable can protect the cable and the equipment connected to it from lightning strikes or static electricity interference. This static electricity is taken away from the inside of the cable to avoid damage to the cable or adverse effects on the equipment.

[0027] The insulating layer is made of ultra-soft cross-linked ethylene tetrafluoroethylene material. The thickness of the insulating layer is 0.13 ～ 0.20mm (preferably 0.15mm), which is thinner than the GJB773A / 22 aerospace fluorine-containing polymer insulation layer (thickness is 0.26mm). The ultra-flexible cross-linked ethylene-tetrafluoroethylene material has the properties of high and low temperature resistance, high softness, high flame retardancy, high strength, excellent mechanical properties, resistance to outer space radiation, and chemical corrosion. It not only makes the cable have excellent electrical properties, mechanical properties and chemical properties, but also has high wear resistance, temperature resistance, high flame retardancy and high softness. On the basis of ensuring reliable electrical performance, it greatly improves the service life of the cable and makes the electrical performance of the cable more stable during use;

[0028] The ultra-soft cross-linked ethylene tetrafluoroethylene material is a low melt index, low density, and low hardness material, which improves the fluidity of extrusion, can be processed into thin walls, and is softer. A reasonable extrusion stretching ratio and balance ratio are achieved through a high compression ratio screw and mold ratio to achieve compact extrusion and higher extrusion mechanical performance control. Stable wire diameter control is achieved by adjusting the temperature control and retractable wire of the extrusion equipment to achieve the purpose of controlling product weight reduction.

[0029] The wrapping tape layer is a double-layer wrapping structure of high-temperature resistant polyimide wrapping and polyimide / aluminum-plastic tape;

[0030] The inner shielding layer is a silver-plated or tin-plated copper wire braided layer, and the outer shielding layer is a silver-plated aramid wire braided layer. The braiding density of a single shielding layer reaches more than 90%, and the combined shielding of the inner shielding layer and the outer shielding layer can cover the cable core 100%, which not only enhances the anti-electromagnetic interference performance of the cable, but also the use of aramid wire can not only reduce weight but also play a key role in improving the overall tensile strength of the cable.

[0031] Furthermore, the tinned copper wire braid is used in pairs with the tinned copper conductor, and the silver-plated copper wire braid is used in pairs with the silver-plated or nickel-plated copper conductor, which matches the temperature resistance level required by the product and ensures the stability of the cable use.

[0032] The sheath is made of ultra-soft cross-linked ethylene tetrafluoroethylene material; the thickness of the sheath is 0.13 ～ 0.30mm, it not only has high temperature resistance, excellent mechanical and electrical properties, but also has low material hardness and increased softness, and it also has a weight reduction effect.

[0033] The filling wire is made of high tensile solid cross-linked ethylene tetrafluoroethylene material, thereby enhancing the mechanical strength of the cable.

[0034] The features of this utility model are as follows:

[0035] The utility model has the outstanding advantages of compact structure, high softness, high tensile strength, high shielding, good stability, small diameter, light weight, high flame retardancy, high temperature resistance, chemical corrosion resistance, excellent mechanical properties, salt spray resistance, mildew resistance and moisture resistance, excellent resistance to outer space radiation, etc. The high and low temperature resistance range is -65℃~200℃, and can meet the long-term use at a high temperature of 200℃. It can be applied to civil and military aircraft, satellites, rockets and other aircraft in working environments with high ambient temperature and poor heat dissipation. Compared with other aircraft cable products, it is more suitable for application in areas with narrow laying space, high bending requirements and high tensile requirements.

[0036] The materials described in the utility model can all be purchased from outside.

[0037] The above is a detailed introduction to an airborne thin-walled, high-temperature resistant, flexible cable provided by the utility model. For general manufacturers in this field, according to the ideas and principles of the embodiments of the utility model, there will be changes in the specific implementation methods and application scopes. Therefore, the contents of this specification should not be understood as limiting the utility model.

Claims

1. An airborne thin-walled high-temperature resistant flexible cable, comprising a cable core and a tape layer (4), an inner shielding layer (5), an outer shielding layer (7) and an outer sheath (8) covering the cable core in sequence from the inside to the outside; characterized in that: The cable core comprises a plurality of conducting wires, a drainage wire (1) and a filling wire (6) arranged in parallel along the length direction of the cable; the conducting wire comprises a conductor (2) and an insulating layer (3) coated on the conductor.

2. The airborne thin-wall high temperature resistant flexible cable according to claim 1, characterized in that: The conductor is a plurality of twisted copper wires with coating.

3. The airborne thin-walled high temperature resistant flexible cable according to claim 2, characterized in that: The inner shielding layer is a plated metal copper wire braided layer.

4. The airborne thin-walled high temperature resistant flexible cable according to claim 3, characterized in that: The outer shielding layer is a silver-plated aramid silk braided layer.

5. The airborne thin-wall high temperature resistant flexible cable according to claim 4, characterized in that: The insulating layer and the sheath are both ultra-flexible cross-linked ethylene-tetrafluoroethylene material layers; the thickness of the insulating layer is 0.13-0.20 mm; the thickness of the outer sheath is 0.13-0.30 mm.

6. The thin-walled, high-temperature-resistant, flexible cable for airborne use according to claim 5, characterized in that: The drain wire is a multi-strand twisted soft copper conductor plated with silver, tin or nickel, and is covered with a soft cross-linked ethylene tetrafluoroethylene insulation layer.

7. The airborne thin-walled high temperature resistant flexible cable according to claim 6, characterized in that: The diameter of the plated metal copper wire is 0.08-0.10 mm, and the diameter of the aramid wire is 150D or 250D.

8. The airborne thin-walled high temperature resistant flexible cable according to claim 7, characterized in that: The filler wire is a solid cross-linked ethylene tetrafluoroethylene material.

9. The airborne thin-walled high temperature resistant flexible cable according to claim 8, characterized in that: The wrapping tape layer is a double-layer wrapping structure of high-temperature resistant polyimide wrapping and polyimide / aluminum-plastic tape wrapping.

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