Anti-cracking non-grounding shielding flexible fireproof communication cable

Abstract

The utility model discloses an anti-cracking non-grounding shielding flexible fireproof communication cable, which comprises a cable core formed by six insulating wire cores surrounding a central ETFE resin core tube and twisting the six insulating wire cores and a PPS fiber filling core material, and an early warning insulating wire core is sleeved in the central ETFE resin core tube in a clearance manner. Each of the insulating wire cores and the early warning insulating wire cores comprises an inner conductor, an insulating fireproof tape gap inner wrapping layer, an insulating fireproof tape gap outer wrapping layer and a silicone rubber insulating layer. The cable core is sequentially coated with a high-temperature glass fiber tape longitudinal wrapping protective layer, a high-temperature glass fiber wire wrapping layer, a low-smoke halogen-free polyolefin inner sheath layer, a copper-plastic composite wrapping shielding layer and a low-smoke halogen-free polyolefin outer sheath layer. The fireproof communication cable ensures line integrity, inhibits copper foil surface oxidation and prevents copper foil layer cracking within a specified time when a fire occurs, the copper foil layer does not need to be grounded, the complex operation cost and the process difficulty are reduced, and the durability is better.

Description

Technical Field

[0001] The present application relates to the field of cable technology, and in particular to an anti-cracking non-grounded shielded flexible fireproof communication cable. 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 example, communication cables and control cables used for indoor instruments, as well as electrical noise environments in office buildings and wiring cables for fire alarm systems, need to ensure circuit integrity for 30-90 minutes. As the fire protection requirements of the cable industry gradually increase, new requirements are put forward for the fire protection performance of fireproof communication cable products. Communication cables with better fire protection performance have been increasingly adopted to ensure that there is no short circuit within the specified time during a fire and to ensure line integrity. At present, the copper foil shielding layer of fireproof communication cables is prone to corrosion and oxidation in a relatively complex and harsh working environment, which makes the copper foil layer prone to cracking, discoloration, deterioration and failure, and has poor durability. In addition, the copper foil shielding layer needs to be grounded, and the grounding operation is complicated and costly. If the grounding treatment is not adopted, the copper foil surface will be charged and easily cause signal crosstalk, affecting normal operation. 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 crack-proof non-grounded shielded flexible fire-proof communication cable, which has improved fire resistance and better fire resistance and flame retardancy. When a fire occurs, the integrity of the line can be guaranteed within a specified time, the oxidation of the copper foil surface can be inhibited, and the cracking of the copper foil layer can be prevented. The copper foil layer does not need to be grounded, which reduces the cost of complex operations and the difficulty of the process and has better durability.

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

[0005] The anti-cracking non-grounded shielded flexible fireproof communication cable comprises six insulating cores wrapped around a central ETFE resin core tube and twisted together with a PPS fiber-filled core material to form a cable core; an early warning insulating core is provided in a gap sleeve inside the central ETFE resin core tube; the outer diameter of the early warning insulating core is smaller than the outer diameter of the insulating core; the insulating core and the early warning insulating core both comprise an inner conductor, an insulating fireproof belt gap inner winding layer, an insulating fireproof belt gap outer winding layer and a silicone rubber insulating layer; the outside of the cable core is sequentially coated with a high-temperature glass fiber longitudinally wrapped protective layer, a high-temperature glass fiber winding layer, a low-smoke halogen-free polyolefin inner sheath layer, a copper-plastic composite winding shielding layer and a low-smoke halogen-free polyolefin outer sheath layer; the copper-plastic composite winding shielding layer is a copper-plastic composite tape spirally overlapped winding structure; the copper-plastic composite tape is composited by a polyimide film surface layer, a copper foil, a copper-zinc alloy electroplating layer and a polyimide film bottom 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 inner wrapping layer of the insulating fireproof belt gap is a single-layer gap wrapping structure of an inner insulating fireproof belt, and the outer wrapping layer of the insulating fireproof belt gap is an outer insulating fireproof belt covering the gap of the inner wrapping layer of the insulating fireproof belt gap and presents a single-layer gap wrapping structure, and the insulating fireproof belt is a double-layer bonded integrated structure of a cross-linked polyethylene resin layer and a mica tape layer.

[0010] 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.

[0011] 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.

[0012] Preferably, the inner conductor is composed of a plurality of tinned copper monofilaments with a wire diameter of 0.02 mm to 0.08 mm, and the lay direction of the tinned copper monofilaments is opposite to that of the cable core.

[0013] Preferably, the overlap rate of the copper-plastic composite tape is 15% to 30%.

[0014] Preferably, the thickness of the polyimide film surface layer and the polyimide film bottom layer are both 30μm to 200μm, the thickness of the copper foil is 8μm to 100μm, the thickness of the copper-zinc alloy electroplating layer does not exceed 5μm, and the copper-zinc alloy electroplating layer is formed by electroplating the outer surface of the copper foil.

[0015] Beneficial effects of this application:

[0016] 1. The insulated wire core is effectively fire-proofed and isolated from the inner conductor and the silicone rubber insulation layer by the inner and outer winding layers of the insulating fireproof belt gap, which greatly improves the fireproof and fire-resistant performance. The outer insulating fireproof belt covers the inner winding gap, 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 winding layers of the insulating fireproof belt gap. At the same time, the cable core is filled with PPS fiber-filled core material, which has good heat resistance and high mechanical strength, improves the flexibility, fire resistance and fireproof properties of the cable, forms multi-layer fire-resistant and flame-retardant properties, prevents short circuits within the specified time, and ensures line integrity.

[0017] 2. By improving the structure of the copper-plastic composite wrapped shielding layer, removing the grounding wire, and adding a copper-zinc alloy electroplating layer on the outer surface of the copper foil, it has sufficient corrosion resistance, which is beneficial to protecting the copper foil layer, inhibiting the oxidation of the copper foil, and eliminating the discoloration and other degradation caused by oxidation. In addition, polyimide film is added on both sides of the copper foil to improve the flexibility of the shielding layer, relieve stress concentration, and prevent the copper foil from cracking and failure. The overlap rate of the copper-plastic composite tape is 15% to 30%. After the shielding layer is wrapped, there is no need for grounding treatment, which can effectively prevent the copper foil surface from being charged, ensure stable shielding performance, and help reduce complex operation costs and process difficulty.

[0018] 3. The early warning insulation core and the central ETFE resin core tube maintain a clearance fit. When the cable is bent, it helps to reduce the lateral pressure on the inner conductor of the early warning insulation core, inhibit conductor breakage, and avoid excessive early breakage warning. In addition, the diameter of the early warning insulation core is smaller than the insulation core diameter, which prevents delayed alarms and helps improve the accuracy of early warnings.

[0019] 4. By improving the high-temperature glass fiber tape longitudinal wrapping protective layer structure into a three-layer high-temperature glass fiber tape longitudinal wrapping structure with three longitudinal gaps formed and arranged circumferentially in an interlaced manner, the longitudinal wrapping tension is tight and does not change easily, and will not wrinkle. While enhancing the fire resistance, the flexibility of the shielding layer is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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.

[0021] Figure 1 It is a schematic diagram of the cross-sectional structure of an embodiment of the present application.

[0022] In the figure: 1-insulated wire core, 2-central ETFE resin core tube, 3-PPS fiber filling core material, 4-early warning insulated wire core, 5-inner conductor, 6-insulated fireproof belt gap inner winding layer, 7-insulated fireproof belt gap outer winding layer, 8-silicone rubber insulation layer, 9-high temperature glass fiber tape longitudinal wrapped protective layer, 10-high temperature glass fiber wire winding layer, 11-low smoke halogen-free polyolefin inner sheath layer, 12-copper plastic composite winding shielding layer, 13-low smoke halogen-free polyolefin outer sheath layer. DETAILED DESCRIPTION

[0023] 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.

[0024] like Figure 1As shown, the crack-proof non-grounded shielded flexible fireproof communication cable of the embodiment of the present application includes six insulating cores 1 surrounding a central ETFE resin core tube 2 and twisted together with a PPS fiber-filled core material 3 to form a cable core. An early warning insulating core 4 is sleeved in the inner gap of the central ETFE resin core tube 2, and the outer diameter of the early warning insulating core 4 is smaller than the outer diameter of the insulating core 1. The insulating core 1 and the early warning insulating core 4 both include an inner conductor 5, an insulating fireproof zone gap inner sheath 6, an insulating fireproof zone gap outer sheath 7 and a silicone rubber insulating layer 8. Specifically, the inner conductor 5 is composed of a plurality of tinned copper monofilaments with a wire diameter of 0.02 mm to 0.08 mm, and the twist direction of the tinned copper monofilaments is opposite to that of the cable core. In one embodiment, the inner wrapping layer 6 in the gap of the insulating fireproof belt is a single-layer gap wrapping structure of the inner insulating fireproof belt, and the outer wrapping layer 7 in the gap of the insulating fireproof belt is an outer insulating fireproof belt covering the gap of the inner wrapping layer 6 in the gap of the insulating fireproof belt and presents 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. Specifically, the inner wrapping layer 6 in the gap of the insulating fireproof belt and the outer wrapping layer 7 in the gap of the insulating fireproof belt have the same winding direction, and the overlap rate of the outer wrapping layer 7 in the gap of the insulating fireproof belt is one quarter to one half of the width of the inner insulating fireproof belt.

[0025] The cable core is coated with a high-temperature glass fiber tape longitudinally wrapped protective layer 9, a high-temperature glass fiber wire wrapped layer 10, a low-smoke halogen-free polyolefin inner sheath layer 11, a copper-plastic composite wrapped shielding layer 12 and a low-smoke halogen-free polyolefin outer sheath layer 13 in sequence. In one embodiment, the high-temperature glass fiber tape longitudinally wrapped protective layer 9 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. Specifically, 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. The copper-plastic composite wrapped shielding layer 12 is a copper-plastic composite tape spirally overlapped wrapped structure, and further, the copper-plastic composite tape overlap rate is 15% to 30%. The copper-plastic composite belt is formed by a polyimide film surface layer, a copper foil, a copper-zinc alloy electroplated layer and a polyimide film bottom layer. Specifically, the thickness of the polyimide film surface layer and the polyimide film bottom layer are both 30 μm to 200 μm, the thickness of the copper foil is 8 μm to 100 μm, the thickness of the copper-zinc alloy electroplated layer does not exceed 5 μm, and the copper-zinc alloy electroplated layer is formed by electroplating the outer surface of the copper foil.

[0026] 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. Anti-cracking non-grounded shielded flexible fire-proof communication cable, characterized by: The invention comprises six insulating wire cores (1) surrounding a central ETFE resin core tube (2) and twisted together with a PPS fiber-filled core material (3) to form a cable core; a warning insulating wire core (4) is sleeved in the inner gap of the central ETFE resin core tube (2); the outer diameter of the warning insulating wire core (4) is smaller than the outer diameter of the insulating wire core (1); the insulating wire core (1) and the warning insulating wire core (4) both comprise an inner conductor (5), an insulating fireproof zone gap inner sheath (6), and an insulating fireproof zone gap outer sheath (7). 7) and a silicone rubber insulation layer (8), the cable core is coated with a high-temperature glass fiber tape longitudinally wrapped protective layer (9), a high-temperature glass fiber wire wrapped layer (10), a low-smoke halogen-free polyolefin inner sheath layer (11), a copper-plastic composite wrapped shielding layer (12) and a low-smoke halogen-free polyolefin outer sheath layer (13) in sequence, the copper-plastic composite wrapped shielding layer (12) is a copper-plastic composite tape spirally overlapped wrapped structure, and the copper-plastic composite tape is formed by a polyimide film surface layer, a copper foil, a copper-zinc alloy electroplated layer and a polyimide film bottom layer.

2. The anti-cracking non-grounded shielded flexible fireproof communication cable according to claim 1 is characterized by: The high-temperature glass fiber tape longitudinally wrapped protective layer (9) 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 anti-cracking non-grounded shielded flexible fireproof communication cable according to claim 2 is characterized by: The three longitudinal gaps are 120 degrees from each other in circumferential direction.

4. The anti-cracking non-grounded shielded flexible fireproof communication cable according to claim 2 is characterized by: The gap distance of the longitudinal gap does not exceed 50 microns.

5. The anti-cracking non-grounded shielded flexible fireproof communication cable according to claim 1 is characterized by: The inner wrapping layer (6) of the insulating fireproof belt gap is a single-layer gap wrapping structure of the inner insulating fireproof belt gap, the outer wrapping layer (7) of the insulating fireproof belt gap is an outer insulating fireproof belt that covers the gap of the inner wrapping layer (6) of the insulating fireproof belt gap and is a single-layer gap wrapping structure, and the insulating fireproof belt is a double-layer bonded integrated structure of a cross-linked polyethylene resin layer and a mica tape layer.

6. The anti-cracking non-grounded shielded flexible fireproof communication cable according to claim 5 is characterized by: The winding direction of the inner winding layer (6) of the insulation fireproof belt gap and the outer winding layer (7) of the insulation fireproof belt gap are the same.

7. The anti-cracking non-grounded shielded flexible fireproof communication cable according to claim 5 is characterized by: The overlap rate of the outer wrapping layer (7) of the gap of the insulating fireproof belt is one quarter to one half of the width of the inner insulating fireproof belt.

8. The anti-cracking non-grounded shielded flexible fireproof communication cable according to claim 1 is characterized by: The inner conductor (5) is composed of a plurality of tinned copper monofilaments having a wire diameter of 0.02 mm to 0.08 mm, and the twisting direction of the tinned copper monofilaments is opposite to that of the cable core.

9. The anti-cracking non-grounded shielded flexible fireproof communication cable according to claim 1 is characterized by: The overlap rate of copper-plastic composite tape is 15% to 30%.

10. The anti-cracking non-grounded shielded flexible fireproof communication cable according to claim 1, characterized in that: The thickness of the polyimide film surface layer and the polyimide film bottom layer are both 30μm to 200μm, the thickness of the copper foil is 8μm to 100μm, the thickness of the copper-zinc alloy electroplating layer does not exceed 5μm, and the copper-zinc alloy electroplating layer is formed by electroplating the outer surface of the copper foil.

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