Fireproof wire for aerospace electrical system

Abstract

The utility model discloses a fireproof wire for an aerospace electrical system, which comprises a conductor, a protective layer and an insulating layer, the conductor is coated with the protective layer, and the protective layer is coated with the insulating layer; the conductor adopts a copper conductor plated with 27% nickel; the protective layer adopts a silicone rubber / glass fiber / mica composite mica tape; and the insulating layer adopts a fluorinated ethylene propylene polyimide composite belt. The components of the cable are all made of high-temperature-resistant materials, the requirements for small space, flexibility and space environment of aerospace are fully considered, it is ensured that the product is small in structure size, light in weight, good in flexibility and small in bending radius, and the requirement that the insulation resistance of the product is not smaller than 10000 ohms at the flame temperature (1100 + / -80) DEG C can be met, and a flame and vibration combined test can be conducted for 15 min.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a fireproof wire for an aerospace electrical system. Background Art

[0002] At present, the aerospace industry is developing better and better, and the demand for fire-resistant cables used in aircraft electrical systems is gradually increasing. The quality requirements for cables are also very high. At present, the fire-resistant cables on the market are mainly 1.5mm 2 The above sheath products are made of seamless copper tube as sheath and magnesium oxide as insulation material. Due to the special material, they can ensure normal operation within 30 minutes at 1000℃. However, this kind of product has hard texture, large bending radius and large product specifications, while the minimum cross-section of fireproof wires for aerospace electrical systems is 0.2mm. 2 , small structural size, light weight, good flexibility and small bending radius, so this type of product is difficult to meet future usage needs. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the defects of the prior art and provide a fireproof wire for an aerospace electrical system, the components of which are all made of high temperature resistant materials, and full consideration is given to the small space, softness, and space environment requirements of aerospace, to ensure that the product has a small structural size, light weight, good softness, a small bending radius, and can meet the requirements of a flame temperature of (1100±80)℃, the product insulation resistance is not less than 10000Ω, and a flame and vibration combined test is carried out for 15 minutes.

[0004] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0005] The utility model discloses a fireproof wire for an aerospace electrical system, comprising a conductor, a protective layer and an insulating layer. The outer surface of the conductor is coated with the protective layer, which can increase the fireproof performance of the wire. The outer surface of the protective layer is coated with an insulating layer to ensure the electrical and mechanical properties of the product.

[0006] The conductor is a 27% nickel-plated copper conductor. The use of a 27% nickel-plated conductor can greatly improve the temperature resistance of the product and ensure that the product can be used for a short period of time at high temperatures.

[0007] The protective layer is made of mica tape composited with silicone rubber / glass fiber / mica; this composite structure makes its melting point as high as 1200°C to 1300°C, thereby ensuring its excellent fire resistance. When encountering fire, the mica tape layers sinter with each other and with the copper conductor to form a mechanical resistance and electrical insulation layer, which can ensure electrical integrity;

[0008] The insulating layer is made of a polyperfluoroethylene-propylene-polyimide composite tape; this composite structure ensures that the polyimide has excellent electrical insulation performance and high temperature resistance, corrosion resistance, radiation resistance and other characteristics, and also has the characteristics of high temperature self-melting sealing and the like.

[0009] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0010] The components of the utility model are all made of high temperature resistant materials, and full consideration is given to the requirements of small aerospace space, softness, and space environment, ensuring that the product has small structural dimensions, light weight, good softness, and a small bending radius. It can also meet the requirements of a flame temperature of (1100±80)℃, with an insulation resistance of not less than 10000Ω, and a combined flame and vibration test for 15 minutes.

[0011] The conductor is made of 27% nickel-plated copper conductor. The melting point of nickel is about twice that of copper, which can effectively protect the plated conductor from high temperature. After the copper conductor is nickel-plated, its resistance is only slightly higher, but it is very soft and fatigue-resistant. The current carrying capacity of nickel-plated conductors is greater than that of conductors of equal specifications. Under the same laying conditions, when the wires transmit the same current at the same temperature, the outer diameter of the nickel-plated conductor wire and the space occupied by the wire can be significantly reduced.

[0012] The protective layer uses a mica tape composited with silicone rubber / glass fiber / mica to cover the conductor, which plays a fire-proof role. This composite structure is softer than general-purpose mica tape and can be used in the production of small-sized wires. The melting point of this material is as high as 1200℃~1300℃, which ensures its excellent fire-proof performance. When encountering fire, the mica tape layers sinter to each other and to the copper conductor to form a mechanical resistance and electrical insulation layer, which can ensure electrical integrity.

[0013] The insulating layer is covered with a protective layer of polytetrafluoroethylene-propylene-polyimide composite tape to play an insulating role. The material has the characteristics of high-temperature self-melting and sealing, which can effectively shape the product. It also has excellent electrical insulation performance and high temperature resistance, corrosion resistance, radiation resistance and other characteristics, ensuring that the product can be used in aerospace environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0015] Figure 1 It is a cross-sectional schematic diagram of the utility model;

[0016] In the figure: 1. Conductor; 2. Protective layer; 3. Insulating layer. DETAILED DESCRIPTION

[0017] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0018] Example 1

[0019] like Figure 1 As shown, the utility model provides a fireproof wire for an aerospace electrical system, comprising a conductor 1, a protective layer 2 and an insulating layer 3. The outer surface of the conductor 1 is coated with the protective layer 2 to increase the fireproof performance of the wire, and the outer surface of the protective layer 2 is coated with the insulating layer 3 to ensure the electrical and mechanical properties of the product;

[0020] Conductor 1 uses 27% nickel-plated copper conductor; the use of 27% nickel-plated conductor can greatly improve the temperature resistance level of the product and ensure that the product can be used for a short period of time at high temperatures;

[0021] The protective layer 2 is made of mica tape composited with silicone rubber / glass fiber / mica; this composite structure makes its melting point as high as 1200°C to 1300°C, thereby ensuring its excellent fire resistance. When encountering fire, the mica tape layers sinter with each other and with the copper conductor to form a mechanical resistance and electrical insulation layer, which can ensure electrical integrity;

[0022] The insulating layer 3 is made of a polyperfluoroethylene-propylene-polyimide composite tape; this composite structure ensures that polyimide has excellent electrical insulation performance and high temperature resistance, corrosion resistance, radiation resistance and other characteristics, and also has the characteristics of high temperature self-melting sealing and the like.

[0023] More specifically, conductor 1 is formed by twisting 27% nickel-plated copper wires, which comply with the provisions of GB / T11019-2009. The melting point of nickel is approximately twice that of copper, and it can effectively protect the plated conductor from high temperatures. After the copper conductor is nickel-plated, its resistance is only slightly higher, but it is very soft and fatigue-resistant. The current carrying capacity of the nickel-plated conductor is greater than that of the conductor of the same specification. When the wires under the same laying conditions transmit the same current at the same temperature, the outer diameter of the nickel-plated conductor wire and the space occupied by the wire can be significantly reduced.

[0024] More specifically, the protective layer 2 is formed by winding a mica tape composed of silicone rubber / glass fiber / mica. This composite structure is softer than general-purpose mica tape and can be used for the production of small-sized wires. The melting point of this material is as high as 1200°C to 1300°C, thus ensuring that it has excellent fire resistance. When encountering fire, the mica tape layers sinter to each other and to the copper conductor to form a mechanical resistance and electrical insulation layer, which can ensure electrical integrity.

[0025] More specifically, the insulating layer 3 is made of a fluoroethylene-polypropylene-polyimide composite tape that is wound and sintered. The material has the characteristics of high-temperature self-melting and sealing, which can effectively shape the product. It also has excellent electrical insulation properties and high temperature resistance, corrosion resistance, radiation resistance and other properties, ensuring that the product can be used in aerospace environments.

[0026] In summary, the components of the utility model are all made of high temperature resistant materials, and full consideration is given to the requirements of small aerospace space, softness, and space environment, ensuring that the product has a small structural size, light weight, good softness, and a small bending radius. It can also meet the flame and vibration combined test for 15 minutes at a flame temperature of (1100±80)℃, and the product insulation resistance is not less than 10000Ω.

[0027] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A fireproof wire for an aerospace electrical system, characterized in that: It comprises a conductor (1), a protective layer (2) and an insulating layer (3), wherein the outer surface of the conductor (1) is coated with the protective layer (2), and the outer surface of the protective layer (2) is coated with the insulating layer (3); The conductor (1) is a copper conductor plated with 27% nickel; The protective layer (2) is a mica tape composited with silicone rubber / glass fiber / mica; The insulating layer (3) is made of a fluorinated ethylene propylene polyimide composite tape.

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