一种具有多层复合绝缘结构的耐高温电缆

Abstract

本实用新型涉及电缆技术领域，尤其涉及一种具有多层复合绝缘结构的耐高温电缆，包括由内至外依次设置的导体组件、内绝缘层、屏蔽层、外绝缘层和外护层；内绝缘层由内至外依次包括第一聚酰亚胺绝缘层、陶瓷化硅橡胶绝缘层和云母带绕包层，外绝缘层由内至外依次包括第二聚酰亚胺绝缘层和芳纶纤维编织层；导体组件包括多根绞合的镀锡铜导体，镀锡铜导体与内绝缘层之间设置有耐高温填充绳；屏蔽层为镀锡铜丝编织网，镀锡铜丝编织网内表面涂覆有石墨烯涂层；外护层为玻璃纤维增强聚四氟乙烯护套，且外表面设有螺旋形散热沟槽；该实用新型通过多层复合绝缘结构的设计，显著提升电缆的综合性能，实现耐温性、绝缘性、屏蔽性及适应性的综合优化。

Claims

1. A high temperature resistant cable having a multi-layer composite insulation structure, characterized by: The device comprises, from the inside out, a conductor assembly (1), an inner insulation layer (2), a shielding layer (3), an outer insulation layer (4), and an outer sheath (5); the inner insulation layer (2) comprises, from the inside out, a first polyimide insulation layer (21), a ceramicized silicone rubber insulation layer (22), and a mica tape wrapping layer (23); the outer insulation layer (4) comprises, from the inside out, a second polyimide insulation layer (41) and an aramid fiber braided layer (42); the conductor assembly (1) comprises multiple stranded tin-plated copper conductors (11), and a high-temperature resistant filler rope (12) is provided between the tin-plated copper conductors (11) and the inner insulation layer (2); the shielding layer (3) is a tin-plated copper wire braided mesh (31), and the inner surface of the tin-plated copper wire braided mesh (31) is coated with a graphene coating (32); the outer sheath (5) is a glass fiber reinforced polytetrafluoroethylene sheath, and the outer surface is provided with spiral heat dissipation grooves (51).

2. The high temperature resistant cable having a multi-layer composite insulation structure according to claim 1, characterized in that: The diameter of the single wire of the tin-plated copper conductor (11) is 0.15mm to 0.25mm, and the twisting pitch ratio is 12 to 15 times the conductor diameter; the diameter of the high-temperature resistant filler rope (12) is 0.3 to 0.5 times the diameter of the tin-plated copper conductor (11).

3. The high temperature resistant cable having a multi-layer composite insulation structure according to claim 1, characterized in that: The thickness ratio of the first polyimide insulation layer (21) to the ceramicized silicone rubber insulation layer (22) is 1:2, and the thickness of the first polyimide insulation layer (21) is 0.1mm to 0.3mm; the mica tape wrapping layer (23) adopts double-layer overlapping wrapping, the wrapping overlap rate is ≥30%, and the thickness of each layer of mica tape is 0.1mm to 0.15mm.

4. The high temperature resistant cable having a multi-layer composite insulation structure according to claim 1, characterized in that: The tinned copper wire mesh (31) has a weaving density greater than 90%, and the diameter of the copper wire in the tinned copper wire mesh (31) is 0.1 mm to 0.2 mm.

5. The high temperature resistant cable having a multi-layer composite insulation structure according to claim 1, wherein: The thickness of the second polyimide insulating layer (41) is 0.15 mm to 0.35 mm, and the weaving density of the aramid fiber braided layer (42) is greater than 85%.

6. The high temperature resistant cable having a multi-layer composite insulation structure of claim 1, wherein: The thickness of the glass fiber reinforced polytetrafluoroethylene sheath is 0.8mm to 1.2mm, and the helix angle of the spiral heat dissipation groove (51) is 10° to 20°; the groove depth of the spiral heat dissipation groove (51) is 0.3mm to 0.6mm, and the groove width is 0.5mm to 0.8mm.

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