Cable sheath for aerospace
By braiding continuous SiC fibers obtained by high-temperature pyrolysis and copper foil wires, aerospace cable sheaths are prepared, which solves the problems of short service life and poor high-temperature resistance of existing cable sheaths, and achieves light weight, High mechanical strength and high temperature resistance.
Patent Information
- Application Number
- CN202323377874.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-12
- Publication Date
- 2025-01-24
- Estimated Expiration
- 2033-12-12
AI Technical Summary
The short service life of existing aerospace cable sealing sheaths, poor electrical performance and poor high temperature resistance, have become hidden dangers to the safety of aerospace equipment.
After melt spinning and non-melting treatment, polycarbosilane (PCS) fiber is pyrolyzed at high temperature under an inert atmosphere to obtain continuous SiC fiber, which is woven into a braided protective layer and a copper foil braided shielding layer to form aerospace cable protection. set.
The cable sheath is light in weight, has high mechanical strength, is resistant to high temperatures, is flame retardant, is resistant to oil and other chemical solvents, and is suitable for the operating environment of satellites and other aircraft.
Smart Images
Figure CN222394595U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of data cable sheaths for aerospace systems, in particular to a cable sheath for aerospace. Background Art
[0002] Aerospace cables have more practical and special requirements than general ground cables, such as the weight of the insulation material, vacuum outgassing, resistance to atomic oxygen, ultraviolet rays, high-energy radiation, flame retardancy, and mechanical properties. For designers of spacecraft such as satellites, the primary issue is to reduce the weight of the spacecraft itself. For the electronic circuit system weighing hundreds of kilograms in the satellite body and the electronic components that constitute the payload, including wires and cables, their weight must be reduced.
[0003] The basic requirements for aerospace cables are light weight, small diameter, mechanical strength, high temperature resistance and good wear resistance. In addition, they should be resistant to fuel oil, lubricating oil and other chemical solvents. At present, the short service life, poor electrical performance and poor high temperature resistance of aerospace cable sealing sheaths have become a major hidden danger to the safety of aerospace equipment and need to be solved urgently. Utility Model Content
[0004] The purpose of the utility model is to provide a structure of a cable sheath for aerospace use, which is not only light in weight, but also has high mechanical strength, good high temperature resistance, flame retardant, oil and other chemical solvents resistance, and can better adapt to the operating environment of satellites and other aircraft. To achieve the above purpose, the preparation steps of the cable sheath are as follows:
[0005] After polycarbosilane (PCS) is melt-spun to form PCS fibers, the PCS fibers are treated to be infusible, and then pyrolyzed at high temperature in an inert atmosphere to obtain continuous SiC fibers. The continuous SiC fibers are bundled into filaments and woven into a braided protective layer, and copper foil is used to weave a braided shielding layer.
[0006] The aerospace cable sheath prepared by the above preparation process has a structure consisting of a braided shielding layer and a braided protective layer. The braided shielding layer is a double-layer braided layer woven from copper foil wires, and the braided protective layer is woven from silicon carbide (SiC) fibers.
[0007] The SiC fiber single filament prepared in the above preparation process has a fiber strength of 2.3GPa and a linear density of 280tex, and can withstand temperatures up to 1000°C. The cable sheath prepared from this fiber is not only light in weight, but also has high mechanical strength and good high temperature resistance. The braided cable sheath itself has a tensile resistance function and can avoid local excessive bending of the cable. SiC fiber is a ceramic fiber. The cable sheath prepared from this fiber is flame retardant, resistant to oil and other chemical solvents, and can better adapt to the operating environment of satellites and other aircraft. The shielding structure of aerospace cables should be as simple as possible, unnecessary holes should be reduced as much as possible, and additional gaps should not be added as much as possible to achieve a better shielding effect. Therefore, copper foil is woven into a double-layer sheath shielding layer.
[0008] Compared with the prior art, the beneficial effect of the utility model is that the aerospace cable sheath provided by the utility model is not only light in weight, but also has high mechanical strength, good high temperature resistance, flame retardant, resistant to oil and other chemical solvents, and can better adapt to the operating environment of satellites and other aircraft. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art description:
[0010] Figure 1 A schematic cross-sectional view of a cable sheath for aerospace applications
[0011] Among them, 1 conductor; 2 braided protective layer; 3 braided shielding layer. DETAILED DESCRIPTION
[0012] In order to better illustrate the purpose, technical solutions and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments.
[0013] Combination Figure 1 The specific implementation of the utility model is as follows:
[0014] After polycarbosilane (PCS) is melt-spun to form PCS fibers, the PCS fibers are subjected to infusibility treatment and then pyrolyzed at high temperature in an inert atmosphere to obtain continuous Si C fibers. The continuous Si C fibers are bundled into filaments and woven into a braided protective layer, and copper foil is used to weave a braided shielding layer.
[0015] Compared with the prior art, the beneficial effects of the utility model are: the aerospace cable sheath provided by the utility model is not only light in weight, but also has high mechanical strength, good high temperature resistance, flame retardant, resistant to oil and other chemical solvents, and the braided cable sheath itself has anti-pull function, and can avoid local excessive bending of the cable, and can better adapt to the operating environment of satellites and other aircraft.
Claims
1. A cable sheath for aerospace, characterized in that: The structure consists of a braided shielding layer (3) and a braided protective layer (2); the braided shielding layer (3) is a double-layer braided layer braided with copper foil wires, and the braided protective layer (2) is braided with silicon carbide fibers.