Flexible fireproof low-voltage power cable with grounding wire
By adopting a grounded wire-type flexible fire-proof low-voltage cable in the cable, combined with insulated fire-proof tape and PPS fiber braided isolation net, the problem of insufficient circuit integrity in existing fire-proof cables in fire is solved, and higher fire-proof and fire-resistant are achieved Performance and power supply stability.
Patent Information
- Application Number
- CN202420377456.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-29
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2034-02-28
AI Technical Summary
Existing fire-proof cables are difficult to ensure circuit integrity within 30-90 minutes when a fire occurs, and the fire-proof performance is not enough to ensure power supply.
Flexible fire-resistant low-voltage cable with grounding wire, including insulated wire, grounding wire and fully aromatic copolyamide tensile fiber filler core strips, combined with high-temperature glass fiber with longitudinal protective layer, high-temperature glass fiber wire braided mesh and low smoke-free The halogen polyolefin outer sheath is woven by insulated fireproof belt gap inner and outer wrapping cladding and PPS fiber braiding isolation net to enhance fire resistance and tensile strength.
It effectively improves fire resistance and fire resistance, ensures power supply within at least 30-90 minutes during fire, ensures circuit integrity, and improves the flexibility and tensile strength of the cable.
Smart Images
Figure CN222145865U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of cable technology, and in particular to a flexible fireproof low-voltage power cable with a grounding wire. Background Art
[0002] The rapid development of industry has provided a huge market space for the wire and cable industry, and the fire protection requirements of the cable industry are also gradually increasing. When a fire occurs inside a building, line integrity is extremely important. For wiring cables used in emergency lighting, control and power circuits, power stations, fire alarm systems, underground tunnels, fire elevators, escalators, and high-rise buildings, circuit integrity is the top priority in ensuring power supply. As the fire protection requirements of the cable industry gradually increase, new requirements are put forward for the fire protection performance of fire-resistant power cable products. Low-voltage power cables with better fire protection performance have been increasingly adopted. The fire protection performance of general fire-resistant cables cannot fully guarantee that there will be no short circuit for at least 30-90 minutes in the event of a fire to ensure circuit integrity. Utility Model Content
[0003] In view of the deficiencies in the prior art, the technical problem to be solved by the present application is to provide a flexible fireproof low-voltage power cable with a grounding wire, which improves the fireproof performance by optimizing the structure and has better fire resistance and flame retardancy, and ensures power supply within the specified time to ensure circuit integrity when a fire occurs.
[0004] This application solves the above technical problems through the following technical solutions.
[0005] A flexible fireproof low-voltage power cable with a grounding wire comprises two insulating cores, a grounding wire and a para-type fully aromatic copolyamide stretched fiber filling core strip which are evenly distributed in a cross shape and twisted together to form a cable core. The outside of the cable core is sequentially coated with a high-temperature glass fiber tape longitudinally wrapped protective layer, a high-temperature glass fiber wire braided mesh and a low-smoke halogen-free polyolefin outer sheath. The insulating core comprises an inner conductor and an insulating fireproof belt gap inner wrapping layer, a PPS fiber braided isolation mesh, an insulating fireproof belt gap outer wrapping layer and an XLPE insulating layer sequentially coated on the outside of the inner conductor. The PPS fiber braided isolation mesh is composed of a number of PPS fiber strands that are mutually reversely spirally wound and woven with a braiding density of not less than 95%. The insulating fireproof belt gap inner wrapping layer is a single-layer gap wrapping structure of an inner insulating fireproof belt gap. The insulating fireproof belt gap outer wrapping layer is an outer insulating fireproof belt covering the gap of the insulating fireproof belt gap inner wrapping layer and is a single-layer gap wrapping structure. The insulating fireproof belt is a double-layer bonded integrated structure of a cross-linked polyethylene resin layer and a mica tape layer.
[0006] Preferably, the high-temperature glass fiber tape longitudinally wrapped protective layer is a three-layer high-temperature glass fiber tape longitudinally wrapped structure with seams, and the three longitudinal gaps formed are arranged circumferentially in an alternating manner.
[0007] Preferably, the three longitudinal gaps are 120 degrees from each other in the circumferential direction.
[0008] Preferably, the gap distance of the longitudinal gap does not exceed 50 microns.
[0009] Preferably, the winding direction of the inner wrapping layer of the insulation fireproof belt gap and the outer wrapping layer of the insulation fireproof belt gap are the same.
[0010] Preferably, the overlap ratio of the outer wrapping layer of the insulating fireproof belt gap is one quarter to one half of the width of the inner insulating fireproof belt band.
[0011] Preferably, the inner conductor is composed of a plurality of tinned copper monofilaments with a wire diameter of 0.05 mm to 0.3 mm, and the lay direction of the tinned copper monofilaments is opposite to that of the cable core.
[0012] Preferably, the high-temperature glass fiber braided mesh is formed by a plurality of high-temperature glass fiber wires being mutually spirally wound and braided, and the braiding density is not less than 85%.
[0013] Preferably, a thermoplastic EVA adhesive layer is provided on the inner surface of the low-smoke halogen-free polyolefin outer sheath.
[0014] Beneficial effects of this application:
[0015] 1. The fireproof and fire-resistant performance is greatly improved by adding inner and outer wrapping layers in the gap of the insulating fireproof belt between the inner conductor and the insulating layer. The outer insulating fireproof belt covers the gap of the inner wrapping layer, and the overlap rate is one-fourth to one-half of the width of the insulating fireproof belt, which effectively prevents the appearance of gaps between the inner and outer wrapping layers in the gap of the insulating fireproof belt. PPS fiber has good heat resistance and high mechanical strength. Adding a PPS fiber woven isolation net between the inner and outer wrapping layers in the gap of the insulating fireproof belt plays a fixed isolation role, effectively preventing the gap from being exposed due to slippage between the inner and outer wrapping layers in the gap of the insulating fireproof belt, ensuring stable fireproof and fire-resistant performance, and ensuring power supply for at least 30-90 minutes to ensure circuit integrity when a fire occurs.
[0016] 2. By adding a para-type fully aromatic copolyamide stretched fiber filling core strip inside the cable core and symmetrically arranged with two insulating cores and grounding wires in a cross shape, the cable core structure is more balanced and more flexible, which helps to withstand lateral pressure during bending and improve the overall tensile strength of the cable.
[0017] 3. By improving the high-temperature glass fiber tape longitudinal wrapping protective layer structure into a three-layer high-temperature glass fiber tape seam longitudinal wrapping structure and forming three longitudinal gaps that are staggered circumferentially, the longitudinal wrapping tension is tight and does not change easily, and will not wrinkle. At the same time, the high-temperature glass fiber wire braided mesh is added to fix the longitudinal wrapping protective layer, enhance the fire resistance, prevent the longitudinal wrapping protective layer from sticking to the outer sheath layer, improve the overall tensile strength of the cable, and protect the outer sheath layer. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The following drawings are intended to facilitate the description of preferred embodiments and are not intended to limit the scope of protection of the present application.
[0019] Figure 1 It is a schematic diagram of the cross-sectional structure of an embodiment of the present application.
[0020] In the figure: 1-insulated wire core, 2-ground wire, 3-para-type fully aromatic copolyamide stretched fiber filling core strip, 4-high temperature glass fiber tape longitudinal protective layer, 5-high temperature glass fiber wire braided mesh, 6-low smoke halogen-free polyolefin outer sheath, 7-inner conductor, 8-insulating fireproof belt gap inner sheath, 9-PPS fiber braided isolation net, 10-insulating fireproof belt gap outer sheath, 11-XLPE insulation layer. DETAILED DESCRIPTION
[0021] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.
[0022] like Figure 1 As shown, the flexible fireproof low-voltage power cable with grounding wire of the embodiment of the present application includes two insulating cores 1, a grounding wire 2 and a para-type fully aromatic copolyamide stretched fiber filling core strip 3, which are evenly distributed in a cross shape and twisted together to form a cable core. The insulating core 1 includes an inner conductor 7. Specifically, the inner conductor 7 is composed of a plurality of tinned copper monofilaments with a wire diameter of 0.05mm to 0.3mm, and the twist direction of the tinned copper monofilaments is opposite to that of the cable core. The outer part of the inner conductor 7 is sequentially coated with an insulating fireproof belt gap inner sheath 8, a PPS fiber braided isolation net 9, an insulating fireproof belt gap outer sheath 10 and an XLPE insulation layer 11. The PPS fiber braided isolation net 9 is composed of a plurality of PPS fiber strands that are mutually reversely spirally wound and woven, and the braiding density is not less than 95%. The inner wrapping layer 8 of the insulating fireproof belt gap is a single-layer gap wrapping structure of the inner insulating fireproof belt gap, and the outer wrapping layer 10 of the insulating fireproof belt gap is an outer insulating fireproof belt covering the gap of the inner wrapping layer 8 of the insulating fireproof belt gap and is a single-layer gap wrapping structure. Further, the overlap rate of the outer wrapping layer 10 of the insulating fireproof belt gap is one-quarter to one-half of the width of the inner insulating fireproof belt gap, and the inner wrapping layer 8 of the insulating fireproof belt gap and the outer wrapping layer 10 of the insulating fireproof belt gap have the same winding direction. The insulating fireproof belt is a double-layer bonded integrated structure of a cross-linked polyethylene resin layer and a mica tape layer.
[0023] The outside of the cable core is sequentially coated with a high-temperature glass fiber tape longitudinally wrapped protective layer 4, a high-temperature glass fiber wire braided net 5 and a low-smoke halogen-free polyolefin outer sheath 6. Further, the inner surface of the low-smoke halogen-free polyolefin outer sheath 6 is provided with a thermoplastic EVA adhesive layer. In one embodiment, the high-temperature glass fiber tape longitudinally wrapped protective layer 4 is a three-layer high-temperature glass fiber tape longitudinally wrapped structure and the three longitudinal gaps formed are arranged circumferentially in an interlaced manner. Further, the three longitudinal gaps are 120 degrees from each other in the circumferential direction, and the gap distance of the longitudinal gaps does not exceed 50 microns. In one embodiment, the high-temperature glass fiber wire braided net 5 is composed of a plurality of high-temperature glass fiber wires that are mutually reversely spirally wound and woven, and the braiding density is not less than 85%.
[0024] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.
Claims
1. Flexible fireproof low-voltage power cable with grounding wire, characterized by: The invention comprises two insulating wire cores (1), a ground wire (2) and a para-type fully aromatic copolyamide stretched fiber filling core strip (3) which are evenly distributed in a cross shape and twisted together to form a cable core. The outside of the cable core is sequentially coated with a high-temperature glass fiber tape longitudinally wrapped protective layer (4), a high-temperature glass fiber wire braided mesh (5) and a low-smoke halogen-free polyolefin outer sheath (6). The insulating wire core (1) comprises an inner conductor (7) and an insulating fireproof belt gap inner wrapping layer (8), a PPS fiber braided isolation mesh (9), and an insulating fireproof belt gap outer wrapping layer (10) sequentially coated on the outside of the inner conductor (7). The insulating fireproof belt comprises a plurality of PPS fiber strands which are mutually spirally wound and woven in a counter-rotating manner, and the woven density is not less than 95%. The inner wrapping layer (8) of the insulating fireproof belt gap is a single-layer gap wrapping structure of the inner insulating fireproof belt gap. The outer wrapping layer (10) of the insulating fireproof belt gap is an outer insulating fireproof belt covering the inner wrapping layer (8) of the insulating fireproof belt gap and is a single-layer gap wrapping structure. The insulating fireproof belt is a double-layer bonded integrated structure of a cross-linked polyethylene resin layer and a mica tape layer.
2. The flexible fireproof low-voltage power cable with grounding wire according to claim 1 is characterized in that: The high-temperature glass fiber tape longitudinally wrapped protective layer (4) is a three-layer high-temperature glass fiber tape longitudinally wrapped structure with seams, and the three longitudinal gaps formed are arranged in a circumferentially staggered manner.
3. The flexible fireproof low-voltage power cable with grounding wire according to claim 2 is characterized in that: The three longitudinal gaps are 120 degrees from each other in the circumferential direction.
4. The flexible fireproof low-voltage power cable with grounding wire according to claim 2 is characterized by: The gap distance of the longitudinal gap does not exceed 50 microns.
5. The flexible fireproof low-voltage power cable with grounding wire according to claim 1 is characterized in that: The winding direction of the inner winding layer (8) of the insulation fireproof belt gap and the outer winding layer (10) of the insulation fireproof belt gap are the same.
6. The flexible fireproof low-voltage power cable with grounding wire according to claim 1 is characterized by: The overlap rate of the outer wrapping layer (10) of the insulation fireproof belt gap is one quarter to one half of the width of the inner insulation fireproof belt.
7. The flexible fireproof low-voltage power cable with grounding wire according to claim 1 is characterized by: The inner conductor (7) is composed of a plurality of tinned copper monofilaments with a wire diameter of 0.05 mm to 0.3 mm, and the twisting direction of the tinned copper monofilaments is opposite to that of the cable core.
8. The flexible fireproof low-voltage power cable with grounding wire according to claim 1 is characterized by: The high-temperature glass fiber braided mesh (5) is formed by a plurality of high-temperature glass fiber wires being mutually spirally wound and braided in opposite directions, and the braiding density is not less than 85%.
9. The flexible fireproof low-voltage power cable with grounding wire according to claim 1 is characterized by: The inner surface of the low-smoke halogen-free polyolefin outer sheath (6) is provided with a thermoplastic EVA adhesive layer.