Flexible light-weight radiation-resistant self-extinguishing shielding cable

Abstract

The utility model provides a flexible lightweight radiation-resistant self-extinguishing shielding cable, which comprises a lead layer, a film insulating layer, an inner fiber insulating layer, a shielding protection layer and an outer fiber insulating layer which are arranged from inside to outside, the film insulating layer is a polyimide film insulating layer, and the inner fiber insulating layer is a polyimide fiber insulating layer. According to the utility model, a polyimide insulating and shielding system with uniform materials is adopted, so that the cable has good mechanical strength, insulating property and radiation resistance; and the polyimide material which is self-extinguished when being away from fire integrally enhances the temperature resistance and fireproof performance of the shielding cable.

Description

Technical Field

[0001] This utility model relates to the field of cable technology, and in particular to a flexible, lightweight, radiation-resistant, self-extinguishing shielded cable. Background Technology

[0002] With increasingly stringent safety and environmental standards, the performance requirements for cables in specific environments or under special working conditions are becoming more and more demanding. In addition to requiring high strength and good flexibility, the demands for key characteristics such as high temperature resistance, radiation resistance, interference resistance, lightweight design, and fire resistance have also significantly increased. These requirements aim to ensure that cables maintain stable operation in harsh environments, thereby improving the reliability and safety of the entire system.

[0003] The shielding layer of shielded cables is mainly made of various non-magnetic materials, currently primarily aluminum foil Mylar and metal braided mesh. The former has a lower temperature resistance rating, which cannot ensure operational reliability in high-temperature environments; the latter has a higher density, increasing the overall mass of the cable and thus affecting transmission efficiency. Furthermore, when used in high-temperature environments, the cable's insulation and sheath materials are prone to softening or burning, leading to performance degradation or even failure. Utility Model Content

[0004] The purpose of this invention is to provide a flexible, lightweight, radiation-resistant, self-extinguishing shielded cable to solve the problems in the background art.

[0005] This utility model provides a flexible, lightweight, radiation-resistant, self-extinguishing shielded cable, comprising, from the inside out, a conductor layer, a thin film insulation layer, an inner fiber insulation layer, a shielding protection layer, and an outer fiber insulation layer. The thin film insulation layer is a polyimide thin film insulation layer, and the inner fiber insulation layer is a polyimide fiber insulation layer.

[0006] Furthermore, the conductor layer includes a plurality of conductors, each of which is covered by the thin film insulating layer.

[0007] Furthermore, the surface of the inner fiber insulation layer is impregnated with a first polyimide varnish layer.

[0008] Furthermore, the diameter of the inner fiber insulation layer after impregnation and drying is 8.4 mm ± 0.1 mm.

[0009] Furthermore, the inner shielding layer is any one of a polyimide copper-plated layer, a polyimide nickel-plated layer, or a polyimide silver-plated fiber layer.

[0010] Furthermore, the outer fiber insulation layer is a polyimide fiber braided layer.

[0011] Furthermore, the surface of the outer fiber insulation layer is impregnated with a second polyimide varnish layer.

[0012] Furthermore, the diameter of the outer fiber insulation layer after impregnation and drying is 9.3 mm ± 0.1 mm.

[0013] Furthermore, the inner fiber insulation layer includes a plurality of forward-winding layers and a plurality of reverse-winding layers.

[0014] Furthermore, the surface of each of the forward-winding layers and each of the reverse-winding layers is coated with polyimide enameled wire enamel.

[0015] Compared with the prior art, the beneficial effects of this utility model include:

[0016] 1. This utility model adopts a polyimide insulation and shielding system with uniform materials throughout, which enables the cable to have good mechanical strength, insulation properties and radiation resistance; the self-extinguishing polyimide material enhances the temperature resistance and fire resistance of the shielded cable as a whole.

[0017] 2. This utility model is simple and easy to implement. It uses fiber materials as the main insulation and protection materials for cables. It is lightweight, flexible, and easy to process. It has low requirements for production equipment and low cost.

[0018] 3. This utility model uses polyimide copper-plated, nickel-plated, or silver-plated fiber as the inner shielding layer material of the cable, which not only reduces the overall weight of the cable and lowers the processing cost, but also effectively improves the shielding performance. Attached Figure Description

[0019] Figure 1 This is a schematic cross-sectional view of the flexible, lightweight, radiation-resistant, self-extinguishing shielded cable in the first embodiment of this utility model.

[0020] Figure 2 for Figure 1 A magnified schematic diagram of the conductor layer in the diagram;

[0021] Figure 3 for Figure 1 A physical image of the flexible, lightweight, radiation-resistant, self-extinguishing shielded cable.

[0022] Explanation of key component symbols:

[0023] Conductor layer 10 Inner fiber insulation layer 30 wire 11 Shielding protective layer 40 Thin film insulating layer 20 Outer fiber insulation layer 50

[0024] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this utility model. Detailed Implementation

[0025] To facilitate understanding of this utility model, a more comprehensive description will be given below with reference to the accompanying drawings. Several embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this utility model will be more thorough and complete.

[0026] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0028] Please see Figures 1 to 3 The present invention provides a flexible, lightweight, radiation-resistant, self-extinguishing shielded cable, comprising, from the inside out, a conductor layer 10, a thin film insulation layer 20, an inner fiber insulation layer 30, a shielding protection layer 40, and an outer fiber insulation layer 50. The thin film insulation layer 20 is a polyimide thin film insulation layer, and the inner fiber insulation layer 30 is a polyimide fiber insulation layer.

[0029] The thin-film insulation layer 20 is a polyimide thin-film insulation layer, which utilizes the excellent insulation and mechanical properties of polyimide film to provide initial insulation protection for the conductor. The inner fiber insulation layer 30 is a polyimide fiber insulation layer, which further enhances the insulation effect. At the same time, the properties of polyimide fiber endow the cable with good flexibility and mechanical strength.

[0030] During operation, the inner fiber insulation layer 30 and the outer fiber insulation layer 50 provide double fire protection for the inside of the cable. The inner fiber insulation layer 30 provides heat insulation for high external temperatures, and the outer fiber insulation layer 50 has a tighter and more reliable structure. The shielding inner sheath 40 can effectively reduce external radiation interference.

[0031] In one embodiment of this utility model, the conductor layer 10 includes a plurality of conductors 11, each of which is covered by the thin film insulation layer 20. The thin film insulation layer 20 insulates each conductor 11, ensuring electrical isolation between each conductor, avoiding short circuits and other problems, and improving the safety and reliability of the cable.

[0032] The thin-film insulation layer 20 is made of polyimide film wrapped around the wire. The polyimide film has a thickness of 25μm, a cutting width of 6.0±0.5mm, and an overlap rate of 45-50% (1 / 2 overlap). It serves to secure the inner enameled wire, strengthen the insulation, and protect the wire core. The diameter after film wrapping is 7.6mm±0.1mm.

[0033] In one embodiment of this invention, the surface of the inner fiber insulation layer 30 is impregnated with a first polyimide varnish layer. This impregnation process further enhances the insulation performance of the inner fiber insulation layer 30, while also improving its resistance to chemical corrosion and abrasion. Precise control of the diameter after impregnation ensures the stability and consistency of the cable structure.

[0034] In one embodiment of this utility model, the diameter of the inner fiber insulation layer after impregnation and drying is 8.4mm ± 0.1mm.

[0035] In one embodiment of this invention, the inner shielding layer is any one of a polyimide copper-plated layer, a polyimide nickel-plated layer, or a polyimide silver-plated fiber layer. These materials utilize the excellent properties of polyimide while combining the shielding performance of metal plating, effectively improving the cable's shielding efficiency. Furthermore, compared to traditional metal shielding materials, the polyimide metal-plated fiber layer is lighter, reducing the overall weight of the cable and lowering processing costs.

[0036] In one embodiment of this utility model, the outer fiber insulation layer 50 is a polyimide fiber braided layer. A second polyimide varnish layer is impregnated and baked onto the surface of the outer fiber insulation layer 50. Specifically, the outer fiber insulation layer 50 is made of polyimide fiber, woven in two layers, and then coated with polyimide enameled wire varnish. After sufficient imidization, the fiber and varnish form a reinforced insulation layer, preventing fiber loosening during subsequent processing, effectively protecting the wire core and improving insulation performance.

[0037] In one embodiment of this utility model, the diameter of the outer fiber insulation layer after impregnation and drying is 9.3mm ± 0.1mm.

[0038] In one embodiment of this utility model, the inner fiber insulation layer includes multiple forward-winding layers and multiple reverse-winding layers. The surface of each forward-winding layer and each reverse-winding layer is coated with polyimide enameled wire varnish. In specific implementation, the 30 layers of inner fiber insulation are made of polyimide fiber, with a total of 6 layers. Each fiber wrapping layer is wrapped in both forward and reverse directions to eliminate stress during the fiber wrapping process and increase the flexibility of the lead wire. After each wrapping layer, polyimide enameled wire varnish is applied, ensuring sufficient impregnation and complete curing of the inner layer without defects, thus improving insulation performance. The diameter of the polyimide fiber after wrapping and coating is 8.4 mm ± 0.1 mm.

[0039] The following tests were conducted on the embodiments to verify the technical performance level of the actual product. The test results are as follows:

[0040]

[0041] The experimental results above show that the flexible, lightweight, radiation-resistant, self-extinguishing shielded cable provided by this invention does indeed have good insulation, radiation protection, and high-temperature resistance properties.

[0042] Compared with the prior art, the beneficial effects of this utility model include:

[0043] 1. This utility model adopts a polyimide insulation and shielding system with uniform materials, which enables the cable to have good mechanical strength, insulation properties and radiation resistance. The self-extinguishing polyimide material enhances the temperature resistance and fire resistance of the shielded cable. Under harsh environments such as high temperature and radiation, the cable can still maintain stable performance, ensuring its safe and reliable operation in special environments.

[0044] 2. This utility model is simple and easy to implement. It uses fiber materials as the main insulation and protection material for the cable. It is lightweight, flexible, and easy to process. It has low requirements for production equipment and low cost. Compared with traditional cables, the cable of this utility model does not require complex and expensive equipment in the production process, which reduces production costs and is conducive to large-scale production and market promotion.

[0045] 3. This utility model uses polyimide copper-plated, nickel-plated, or silver-plated fiber as the inner shielding layer material of the cable, which not only reduces the overall weight of the cable and lowers the processing cost, but also effectively improves the shielding performance.

[0046] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A flexible, lightweight, radiation-hardened, self-extinguishing, shielded cable, characterized in that, The cable comprises, from inside to outside, a conductor layer, a film insulation layer, an inner fiber insulation layer, a shielding protection layer, and an outer fiber insulation layer.

2. The flexible, lightweight, radiation-hardened, self-extinguishing, shielded cable of claim 1, wherein, The conductor layer comprises a plurality of conductors, and each of the conductors is wrapped with the film insulation layer.

3. The flexible, lightweight, radiation-hardened, self-extinguishing, shielded cable of claim 2, wherein, The surface of the inner fiber insulation layer is immersed and baked with a first polyimide paint layer.

4. The flexible, lightweight, radiation-hardened, self-extinguishing shielded cable of claim 1, wherein, The diameter of the inner fiber insulation layer after immersion and baking is 8.4 mm±0.1 mm.

5. The flexible, lightweight, radiation-hardened, self-extinguishing, shielded cable of claim 1, wherein, The shielding protection layer is any one of a polyimide copper plating layer, a polyimide nickel plating layer, or a polyimide silver fiber plating layer.

6. The flexible, lightweight, radiation-hardened, self-extinguishing, shielded cable of claim 1, wherein, The outer fiber insulation layer is a polyimide fiber woven layer.

7. The flexible, lightweight, radiation-hardened, self-extinguishing shielded cable of claim 6, wherein, The surface of the outer fiber insulation layer is immersed and baked with a second polyimide paint layer.

8. The flexible, lightweight, radiation-hardened, self-extinguishing shielded cable of claim 7, wherein, The diameter of the outer fiber insulation layer after immersion and baking is 9.3 mm±0.1 mm.

9. The flexible lightweight radiation tolerant self-extinguishing shielded cable of claim 1, wherein, The inner fiber insulation layer comprises a plurality of forward wrapping sub-layers and a plurality of reverse wrapping sub-layers.

10. The flexible, lightweight, radiation-hardened, self-extinguishing shielded cable of claim 9, wherein, The surface of each of the forward wrapping sub-layers and the reverse wrapping sub-layers is coated and baked with a polyimide paint layer.

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