Fireproof non-armored 20-core total shielding multi-core cable

Abstract

The utility model discloses a fireproof non-armored 20-core total shielding multi-core cable, which comprises an inner-layer wire core body formed by twisting two fireproof power wire cores and a PPS (polyphenylene sulfite) resin filling core material together, a low-smoke halogen-free polyolefin inner sheath, a high-temperature glass fiber belt longitudinally-wrapped fireproof layer, a copper-plastic composite longitudinally-wrapped total shielding layer and a low-smoke halogen-free polyolefin outer sheath are sequentially wrapped outside the inner-layer wire core body, and sheet-shaped grounding copper foil is arranged between the copper-plastic composite longitudinally-wrapped total shielding layer and the low-smoke halogen-free polyolefin outer sheath. Six longitudinal holes are uniformly formed in the circumferential direction of the low-smoke halogen-free polyolefin inner sheath, eight fireproof twisted-pair wire cores, a fireproof control wire core and a fireproof grounding wire are arranged in the longitudinal holes, a PPS resin filling core material is filled in gaps in the longitudinal holes, and the outer diameter of the low-smoke halogen-free polyolefin outer sheath is 27-34 mm. The multi-core cable is round in cable core structure, high in mechanical strength, better in bending resistance, better in fireproof and flame-retardant performance and better in durability.

Description

Technical Field

[0001] The present application relates to the field of cable technology, and in particular to a fireproof non-armored 20-core overall shielded multi-core cable. Background Art

[0002] The wire and cable industry is the second largest industry in China after the automobile industry, with a product variety satisfaction rate and domestic market share exceeding 90%. Globally, China's total output value of wires and cables has made it the world's largest wire and cable producer. With the rapid development of China's wire and cable industry, the overall technical level of the industry has been greatly improved. In the application of multi-core combined cables with power cores, control cores and twisted signal cores, the cable core structure balance and stability are relatively general, the mechanical strength is relatively weak, and the cable core structure is easily deformed by bending and extrusion. The twisted signal core is prone to breakage and core breakage, and the durability is poor. In addition, ordinary multi-core cables have poor fire and heat resistance. With the gradual increase in fire protection requirements in the cable industry, new requirements have been put forward for the fire protection performance of cable products in low-voltage electrical distribution lines. Multi-core cables with better fire protection performance have been increasingly adopted to ensure the safe and stable operation of the distribution system and reduce the occurrence of fire accidents. 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 fireproof non-armored 20-core generally shielded multi-core cable, in which the fireproof twisted pair cores, fireproof control cores, fireproof power cores and fireproof grounding wires are rationally arranged in the cable core structure. The cable core structure is round, has high mechanical strength, better bending resistance, better fire retardant properties, improves safety and reliability, reduces safety hazards, and has better durability.

[0004] This application solves the above technical problems through the following technical solutions.

[0005] The fireproof non-armored 20-core total shielded multi-core cable comprises two fireproof power cores twisted together with a PPS resin filled core material to form an inner core body, the outer part of the inner core body is sequentially coated with a low-smoke halogen-free polyolefin inner sheath, a high-temperature glass fiber tape longitudinally wrapped fireproof layer, a copper-plastic composite longitudinally wrapped total shielding layer and a low-smoke halogen-free polyolefin outer sheath, the copper-plastic composite longitudinally wrapped total shielding layer is a copper-plastic composite tape longitudinally overlapped wrapping structure, the copper-plastic composite tape is a PET film inner layer and a copper foil outer layer bonded together, a sheet-shaped grounding copper foil is arranged between the copper foil outer layer and the low-smoke halogen-free polyolefin outer sheath, the low-smoke halogen-free polyolefin inner sheath is circumferentially evenly provided with six longitudinal holes, eight fireproof twisted cores, a fireproof control core and a fireproof grounding wire are arranged in the longitudinal holes, the gaps in the longitudinal holes are filled with PPS resin filled core material, and the outer diameter of the low-smoke halogen-free polyolefin outer sheath is 27mm to 34mm.

[0006] Preferably, the fireproof power line core comprises a power line core conductor, a modified silicone rubber ceramicized mica fire-resistant composite tape wrapped fire barrier layer and an XLPE insulation layer.

[0007] Preferably, the power line core conductor is formed by twisting 19 tinned copper monofilaments with a wire diameter of 0.3 mm to 0.4 mm, and the thickness of the XLPE insulation layer is 0.7 mm.

[0008] Preferably, the fireproof twisted pair core is composed of two fireproof signal cores twisted together, and the fireproof signal core comprises a signal core conductor, a modified silicone rubber ceramicized mica fire-resistant composite tape wrapped fire barrier layer and an XLPE insulation layer.

[0009] Preferably, the signal line core conductor is formed by twisting 19 tinned copper monofilaments with a wire diameter of 0.2 mm to 0.3 mm, and the thickness of the XLPE insulation layer is 0.7 mm.

[0010] Preferably, the fireproof control wire core comprises a control wire core conductor, a modified silicone rubber ceramicized mica fire-resistant composite tape wrapped fire-retardant layer and an XLPE insulation layer.

[0011] Preferably, the fireproof grounding wire comprises a solid annealed copper conductor, a modified silicone rubber ceramicized mica fire-resistant composite tape wrapped fire-resistant layer and an XLPE insulation layer.

[0012] Preferably, the high-temperature glass fiber tape longitudinally wrapped fireproof 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, and the three longitudinal gaps are 120 degrees from each other in the circumferential direction.

[0013] Preferably, the gap distance of the longitudinal gap does not exceed 50 microns.

[0014] Preferably, the sheet-shaped grounding copper foil has a thickness of 30 μm to 80 μm.

[0015] Beneficial effects of this application:

[0016] 1. The cable core structure is formed by effectively separating and arranging two power cores, eight fireproof twisted cores, one fireproof control core and one fireproof grounding wire in layers through the low-smoke halogen-free polyolefin inner sheath. The cable core structure is round and balanced, which helps to improve the flexibility and mechanical strength of the cable core, effectively prevent core cross-talk, reduce the lateral pressure on each core during bending, improve the bending resistance, inhibit the breakage of the twisted core, ensure stable electrical characteristics, and better durability.

[0017] 2. The conductors and insulation layers of the fireproof twisted pair cores, fireproof power cores, fireproof control cores and fireproof grounding wires are effectively fire-isolated by the fire-blocking layer. The PPS resin-filled core material has good heat resistance and high mechanical strength, which improves the fire resistance of the cable, enhances safety and reliability, and reduces safety hazards. The fire-blocking layer is a modified silicone rubber ceramic mica fire-resistant composite tape wrapping structure with excellent fire resistance and fireproof performance. In the event of a fire, the insulating layer will melt and will not come into direct contact with the inner conductor. In the event of a fire, short circuits can be prevented within the specified time to ensure line integrity.

[0018] 3. The fireproof performance is enhanced by the high-temperature glass fiber tape longitudinally wrapped fireproof layer. The high-temperature glass fiber tape longitudinally wrapped protective layer is improved to a three-layer high-temperature glass fiber tape longitudinally wrapped structure with three longitudinal gaps formed and arranged circumferentially in an interlaced manner, so that the longitudinal wrapping tension is tight and does not change easily, and will not wrinkle, which helps to improve the flexibility and bending resistance of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the cross-sectional structure of an embodiment of the present application.

[0020] Description of reference numerals:

[0021] 1-fireproof power line core, 2-PPS resin filled core material, 3-low smoke halogen-free polyolefin inner sheath, 4-high temperature glass fiber tape longitudinal wrapped fireproof layer, 5-copper plastic composite longitudinal wrapped overall shielding layer, 6-low smoke halogen-free polyolefin outer sheath, 7-sheet grounding copper foil, 8-vertical hole, 9-fireproof twisted pair core, 10-fireproof control line core, 11-fireproof grounding wire. DETAILED DESCRIPTION

[0022] The terms used in the implementation method part of this application are only used to explain the specific embodiments of this application, and are not intended to limit this application. The implementation method of the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0023] See also Figure 1 The fireproof non-armored 20-core total shielded multi-core cable of the embodiment of the present application includes two fireproof power cores 1 and a PPS resin-filled core material 2 twisted together to form an inner core body. In one embodiment, the fireproof power core 1 includes a power core conductor, a modified silicone rubber ceramicized mica fire-resistant composite tape wrapped fire-retardant layer and an XLPE insulation layer. Furthermore, the power core conductor is formed by twisting 19 tinned copper monofilaments with a wire diameter of 0.3mm to 0.4mm, and the thickness of the XLPE insulation layer is 0.7mm.

[0024] The outer part of the inner wire core is covered with a low-smoke halogen-free polyolefin inner sheath 3, a high-temperature glass fiber tape longitudinally wrapped fireproof layer 4, a copper-plastic composite longitudinally wrapped total shielding layer 5 and a low-smoke halogen-free polyolefin outer sheath 6 in sequence, and the outer diameter of the low-smoke halogen-free polyolefin outer sheath 6 is 27mm to 34mm. The low-smoke halogen-free polyolefin inner sheath 3 is evenly distributed with six longitudinal holes 8 in the circumferential direction, and eight fireproof twisted wire cores 9, a fireproof control wire core 10 and a fireproof grounding wire 11 are arranged in the longitudinal holes 8, and the gaps in the longitudinal holes 8 are filled with PPS resin filling core material 2. In one embodiment, the fireproof twisted pair core 9 is composed of two fireproof signal cores twisted together, and the fireproof signal core includes a signal core conductor, a modified silicone rubber ceramic mica fire-resistant composite tape wrapped with a fire barrier layer, and an XLPE insulation layer. Further, the signal core conductor is formed by twisting 19 tinned copper monofilaments with a wire diameter of 0.2mm to 0.3mm, and the thickness of the XLPE insulation layer is 0.7mm. In one embodiment, the fireproof control core 10 includes a control core conductor, a modified silicone rubber ceramic mica fire-resistant composite tape wrapped with a fire barrier layer, and an XLPE insulation layer. In one embodiment, the fireproof grounding wire 11 includes a solid annealed copper conductor, a modified silicone rubber ceramic mica fire-resistant composite tape wrapped with a fire barrier layer, and an XLPE insulation layer.

[0025] The copper-plastic composite longitudinally wrapped total shielding layer 5 is a copper-plastic composite tape longitudinally overlapped wrapped structure, the copper-plastic composite tape is a PET film inner layer and a copper foil outer layer bonded into one, and a sheet-shaped grounding copper foil 7 is arranged between the copper foil outer layer and the low-smoke halogen-free polyolefin outer sheath 6, and further, the sheet-shaped grounding copper foil 7 has a thickness of 30 μm to 80 μm. In one embodiment, the high-temperature glass fiber tape longitudinally wrapped fireproof layer 4 is a three-layer high-temperature glass fiber tape longitudinally wrapped structure with three longitudinal gaps formed and arranged circumferentially in an interlaced manner, and the three longitudinal gaps are 120 degrees from each other in the circumferential direction, and further, the gap distance of the longitudinal gap does not exceed 50 microns.

[0026] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that any technician familiar with this technical field can still modify the technical solutions recorded in the aforementioned embodiments within the technical scope disclosed in the present application, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be covered by the protection scope of the present application.

Claims

1. Fireproof non-armored 20-core total shielded multi-core cable, its characteristics are: Includes two The fireproof power line core (1) and the PPS resin filling core material (2) are twisted together to form an inner line core body, and the outer part of the inner line core body is sequentially coated with a low-smoke halogen-free polyolefin inner sheath (3), a high-temperature glass fiber tape longitudinally wrapped fireproof layer (4), a copper-plastic composite longitudinally wrapped total shielding layer (5) and a low-smoke halogen-free polyolefin outer sheath (6), wherein the copper-plastic composite longitudinally wrapped total shielding layer (5) is a copper-plastic composite tape longitudinally overlapped wrapping structure, wherein the copper-plastic composite tape is a PET film inner layer and a copper foil outer layer bonded together, and the copper foil A sheet-shaped grounding copper foil (7) is arranged between the outer layer and the low-smoke halogen-free polyolefin outer sheath (6); six longitudinal holes (8) are evenly distributed in the circumferential direction of the low-smoke halogen-free polyolefin inner sheath (3); eight fireproof twisted wire cores (9), a fireproof control wire core (10) and a fireproof grounding wire (11) are arranged in the longitudinal holes (8); the gaps in the longitudinal holes (8) are filled with a PPS resin filling core material (2); and the outer diameter of the low-smoke halogen-free polyolefin outer sheath (6) is 27 mm to 34 mm.

2. The fireproof non-armored 20-core overall shielded multi-core cable according to claim 1 is characterized by: The fireproof power line core (1) comprises a power line core conductor, a modified silicone rubber ceramicized mica fire-resistant composite tape wrapped fire-resistant layer and an XLPE insulation layer.

3. The fireproof non-armored 20-core overall shielded multi-core cable according to claim 2 is characterized by: The power line core conductor is formed by twisting 19 tinned copper monofilaments with a wire diameter of 0.3 mm to 0.4 mm, and the thickness of the XLPE insulation layer is 0.7 mm.

4. The fireproof non-armored 20-core overall shielded multi-core cable according to claim 1 is characterized by: The fireproof twisted pair core (9) is composed of two fireproof signal cores twisted together, and the fireproof signal core comprises a signal core conductor, a modified silicone rubber ceramicized mica fire-resistant composite tape wrapped fire barrier layer, and an XLPE insulation layer.

5. The fireproof non-armored 20-core overall shielded multi-core cable according to claim 4 is characterized by: The signal line core conductor is formed by twisting 19 tinned copper monofilaments with a wire diameter of 0.2 mm to 0.3 mm, and the thickness of the XLPE insulation layer is 0.7 mm.

6. The fireproof non-armored 20-core overall shielded multi-core cable according to claim 1 is characterized by: The fireproof control wire core (10) comprises a control wire core conductor, a modified silicone rubber ceramicized mica fire-resistant composite tape wrapped fire-resistant layer, and an XLPE insulation layer.

7. The fireproof non-armored 20-core overall shielded multi-core cable according to claim 1 is characterized by: The fireproof grounding wire (11) comprises a solid annealed copper conductor, a modified silicone rubber ceramicized mica fire-resistant composite tape wrapped fire-resistant layer, and an XLPE insulation layer.

8. The fireproof non-armored 20-core overall shielded multi-core cable according to claim 1 is characterized by: The high-temperature glass fiber tape longitudinally wrapped fireproof 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 staggered manner in the circumferential direction, and the three longitudinal gaps are 120 degrees to each other in the circumferential direction.

9. The fireproof non-armored 20-core overall shielded multi-core cable according to claim 8 is characterized by: The gap distance of the longitudinal gap does not exceed 50 microns.

10. The fireproof non-armored 20-core overall shielded multi-core cable according to claim 1 is characterized by: The sheet-shaped grounding copper foil (7) has a thickness of 30 μm to 80 μm.

Images