A composite spray and impact resistant medium voltage fire resistant cable

Abstract

The utility model provides a kind of composite spray-resistant impact-resistant medium-voltage fire-resistant cable, including conductor and the semiconductive nylon belt layer, inner shielding layer, insulating layer, outer shielding layer, metal shielding layer, basalt fiber belt layer, ceramic silica gel tape layer, corrugated copper sheath layer and organic silicon coating successively wrapped in the outer periphery of conductor. Through the setting of basalt fiber belt, ceramic silica gel tape and corrugated copper sheath, the utility model medium-voltage fire-resistant cable performs outstandingly in fire supply plus spraying, fire supply plus vibration test, effectively solves the technical problem that existing medium-voltage cable is difficult to work normally in harsh environment, and has broad market application prospect. By coating organic silicon paint on the outer periphery of sheath layer, the cable has high-temperature resistance, corrosion resistance and water resistance.

Description

Technical Field

[0001] This utility model belongs to the field of cable technology, and in particular relates to a composite spray-resistant and impact-resistant medium-voltage fire-resistant cable. Background Technology

[0002] Currently, the vast majority of medium-voltage fire-resistant cables produced by enterprises have a structure of conductor + insulation + metal shielding + mica tape + ceramicized polyolefin inner sheath + flame-retardant PVC outer sheath. The fire-resistant layer is mainly formed by the ceramicized polyolefin inner sheath and mica tape to isolate high-temperature corrosion.

[0003] However, the ceramicized polyolefin sheath and mica tape used in this structure will form a fire-resistant and heat-insulating layer at high temperatures. The heat-insulating layer itself is brittle and is prone to cracking under impact conditions. Furthermore, ceramicized polyolefin usually only triggers at high temperatures (>500℃), and may not be able to effectively form a protective layer in low-temperature fires.

[0004] Therefore, there is a need for a medium-voltage fire-resistant cable that can function normally in most harsh environments, meets the fire resistance requirements of the national standard GB / T 19666 and the British standard BS6387, and is resistant to spraying and impact. Utility Model Content

[0005] The purpose of this utility model is to solve the above problems and provide a composite spray-resistant and impact-resistant medium-voltage fire-resistant cable, including a water-blocking conductor and a semiconductor nylon tape layer, an insulation structure, a shielding layer, a heat insulation layer and a sheath layer wrapped from the inside to the outside.

[0006] The heat insulation layer includes a basalt fiber tape layer wrapped around the outer periphery of the shielding layer and a ceramicized silicone tape layer wrapped around the outer periphery of the basalt fiber tape layer.

[0007] The sheath layer is a corrugated copper sheath layer that is resistant to spraying and impact.

[0008] Furthermore, the water-blocking conductor comprises multiple layers of conductors and a semi-conductive nylon tape wrapped around the periphery of each layer of conductors.

[0009] Furthermore, a semi-conductive nylon tape layer is formed by wrapping a semi-conductive nylon tape around the outermost conductor.

[0010] Furthermore, the insulation structure is an extruded and encapsulated structure, comprising an inner shielding layer, an insulation layer, and an outer shielding layer that are integrally and tightly encapsulated around the water-blocking conductor.

[0011] Furthermore, the shielding layer is a copper metal shielding layer, which adopts an overlapping and wrapping structure of copper strips to enhance the shielding effect.

[0012] Furthermore, the outer periphery of the sheath layer is coated with an organosilicon coating that gives the medium-voltage fire-resistant cable high-temperature resistance, corrosion resistance, and water resistance.

[0013] Compared with the prior art, the beneficial effects of this utility model are mainly reflected in:

[0014] 1. By incorporating basalt fiber tape, ceramicized silicone tape, and corrugated copper sheath, this utility model of medium-voltage fire-resistant cable exhibits excellent performance in fire supply and spraying, as well as fire supply and vibration tests. It effectively solves the technical problem that existing medium-voltage cables are prone to malfunctioning in harsh environments and has broad market application prospects.

[0015] 2. This utility model enables the cable to have high temperature resistance, corrosion resistance and water resistance by coating the outer periphery of the sheath layer with an organosilicon coating. Attached Figure Description

[0016] Figure 1 This is a structural schematic diagram of a composite spray-resistant and impact-resistant medium-voltage fire-resistant cable according to the present invention.

[0017] Figure 2 This is a process flow diagram of the medium-voltage fire-resistant cable of this utility model.

[0018] 1. Water-blocking conductor; 2. Semi-conductive nylon tape layer; 3. Inner shielding layer; 4. Insulating layer; 5. Outer shielding layer; 6. Copper tape shielding layer; 7. Basalt fiber tape layer; 8. Ceramicized silicone tape layer; 9. Corrugated copper sheath layer; 10. Coating layer. Detailed Implementation

[0019] The following is a more detailed description of a composite spray-resistant and impact-resistant medium-voltage fire-resistant cable of the present invention, with reference to the schematic diagrams, which illustrate preferred embodiments of the present invention. It should be understood that those skilled in the art can modify the present invention described herein while still achieving the beneficial effects of the present invention. Therefore, the following description should be understood as being of general knowledge to those skilled in the art and is not intended to limit the present invention.

[0020] like Figure 1 As shown, a composite spray-resistant and impact-resistant medium-voltage fire-resistant cable includes a water-blocking conductor and, sequentially wrapped around the water-blocking conductor, a semiconductor nylon tape layer 2, an insulation structure layer, a shielding layer 6, a heat insulation layer, a sheath layer 9, and a coating layer 10.

[0021] 1) Structural design of water-blocking conductor 1

[0022] The water-blocking conductor adopts a profiled compacted water-blocking conductor structure. By wrapping a layer of semi-conductive nylon tape around the outer periphery of each conductor layer, the cross-section and outer diameter are reduced, saving materials and achieving radial water blocking.

[0023] 2) Semiconductor Nylon Tape Layer Structure Design

[0024] By wrapping a semiconductor nylon tape around the outermost conductor of the water-blocking conductor to form a semiconductor nylon tape layer, it is used for shielding and binding the outside of the cable conductor or insulated core. Its semi-conductive properties effectively weaken the electric field strength and ensure the electrical performance of the cable.

[0025] It can prevent moisture from seeping into the cable and ensure a dry environment for internal components.

[0026] Made of nylon, it is highly wear-resistant and can withstand frictional losses during cable laying, while providing sufficient tensile strength and elongation to ensure the stability of the cable structure.

[0027] 3) Insulation structure design

[0028] The insulation structure adopts a three-layer co-extrusion coating structure of cross-linked polyethylene to improve insulation performance.

[0029] 4) Shielding layer 6 structural design

[0030] Shielding layer 6 is a metal shielding layer, which adopts a copper strip overlapping wrapping structure to enhance the shielding effect.

[0031] 5) Thermal insulation layer structural design

[0032] The cable employs a combination of longitudinal wrapping with basalt fiber tape and wrapping with ceramicized silicone tape. The resulting basalt fiber tape layer 7 is resistant to acids, alkalis, and salt spray, and the basalt fibers maintain stable performance even at high temperatures. The resulting ceramicized silicone tape layer 8, with its core advantage of "high-temperature ceramicization," balances flexibility and durability, solving the problem of cables failing to function properly under high-temperature conditions, enhancing fire resistance, and providing insulation protection.

[0033] 6) Sheath layer structure design

[0034] The sheath layer is a metal sheath layer, formed by welding and corrugating copper strips to create a corrugated copper sheath layer 9, which effectively resists impact and vibration and blocks water, allowing for the conduction of more overload current. It increases the sheath's high-temperature resistance and bending performance, and effectively resists spraying and impact, solving the problem of conventional fire-resistant cables failing to function properly in harsh environments.

[0035] 7) Structural design of coating layer 10

[0036] The cable is coated with silicone spray material, which gives it high temperature resistance, corrosion resistance and water resistance, solving the problem of high temperature stability, and is also economical and environmentally friendly.

[0037] refer to Figure 2 The manufacturing processes for each layer of medium-voltage fire-resistant cable are as follows:

[0038] 1) Manufacturing process of water-blocking conductors

[0039] Conductor 1 is made of copper rod drawn and stranded to ensure that the surface is smooth, free of oil stains, and free of burrs and sharp edges that could damage the insulation. A layer of semi-conductive nylon tape is added to each layer of monofilament.

[0040] 2) Manufacturing process of insulation structure

[0041] The insulation structure employs an extrusion coating structure, where the cross-linked polyethylene insulation layer 4, along with the inner shielding layer 3 and the outer shielding layer 5, are simultaneously extruded under high pressure and tightly coated onto the conductor surface to form an integrated insulation structure. The average coating thickness should not be less than the nominal value, the thinnest point thickness should not be less than 90% of the nominal thickness, and the eccentricity should not exceed 10%. The extruded surface should be smooth, free from sharp corners, particles, scorching, scratches, and other defects.

[0042] 3) Manufacturing process of the shielding layer

[0043] The copper strip shielding layer 6 consists of a single layer of overlapping, wrapped soft copper strip. The wrapping is continuous, uniform, smooth, and without breaks, with an overlap rate of not less than 15%. The copper strip should be applied by winding or welding.

[0044] 4) Manufacturing process of the insulation layer

[0045] It uses a layer of basalt fiber tape wrapped longitudinally and a layer of ceramicized silicone tape wrapped around it, with the wrapping being smooth and wrinkle-free.

[0046] 5) Manufacturing process of the sheath layer

[0047] The cable uses a corrugated copper sheath layer 9 with a smooth surface free of defects such as pores and incomplete welds, and the weld protrusions must not damage the cable core. During the production process, the weld quality must be checked in real time, and manual repair welding should be carried out in a timely manner to ensure that the corrugations are sinusoidal, and the lubricant should be blown dry to avoid residue.

[0048] 6) Production process of coating layer 10

[0049] The coating layer is made of a single layer of silicone coating, and the coating should be uniform.

[0050] The above are merely preferred embodiments of this utility model and do not constitute any limitation on this utility model. Any equivalent substitutions or modifications made by those skilled in the art to the technical solutions and contents disclosed in this utility model without departing from the scope of the technical solutions of this utility model shall still fall within the protection scope of this utility model.

Claims

1. A composite spray-resistant and impact-resistant medium-voltage fire-resistant cable, characterized in that, It includes a water-blocking conductor and a semi-conductive nylon tape layer, an insulating structure, a shielding layer, a heat insulation layer, and a sheath layer, which are wrapped from the inside out. The heat insulation layer includes a basalt fiber tape layer longitudinally wrapped around the outer periphery of the shielding layer and a ceramicized silicone tape layer wrapped around the outer periphery of the basalt fiber tape layer. The sheath layer is a corrugated copper sheath layer that is resistant to spraying and impact.

2. The composite spray-resistant and impact-resistant medium-voltage fire-resistant cable according to claim 1, characterized in that, The water-blocking conductor comprises multiple layers of conductors and a semi-conductive nylon tape wrapped around the periphery of each layer of conductors.

3. The composite spray-resistant and impact-resistant medium-voltage fire-resistant cable according to claim 2, characterized in that, The semi-conductive nylon tape layer is formed by wrapping the semi-conductive nylon tape around the outermost conductor.

4. The composite spray-resistant and impact-resistant medium-voltage fire-resistant cable according to claim 1, characterized in that, The insulation structure is an extruded and encapsulated structure, comprising an inner shielding layer, an insulation layer, and an outer shielding layer that are integrally and tightly encapsulated around the water-blocking conductor.

5. The composite spray-resistant and impact-resistant medium-voltage fire-resistant cable according to claim 1, characterized in that, The shielding layer is a copper metal shielding layer, which adopts an overlapping and wrapping structure of copper strips to enhance the shielding effect.

6. The composite spray-resistant and impact-resistant medium-voltage fire-resistant cable according to claim 1, characterized in that, The outer periphery of the sheath layer is also coated with an organosilicon coating that gives the medium-voltage fire-resistant cable high-temperature resistance, corrosion resistance, and water resistance.

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