Fireproof high-speed data cable used in data center system

Abstract

The invention relates to the technical field of cables, in particular to a fire-resistant high-speed data cable used in a data center system. A cable core comprises an inner conductor and an inner protective layer wrapping the surface of the inner conductor. The two cable wire cores and the diversion wire form a group to form a wire core stranded body, a first shielding layer is longitudinally wrapped outside the wire core stranded body, and a wrapping layer is wrapped outside the first shielding layer; six pairs of wire core stranded bodies are uniformly arranged outside the wrapping layer to form a wire pair stranded body, and the wire pair stranded body is sequentially coated with a second shielding layer, a third shielding layer, a fireproof layer and an outer protective layer. The cable has good high temperature resistance and acid and alkali corrosion resistance, is low in production cost and low in low-frequency and high-frequency transmission attenuation, and can be widely applied to the field of power transmission. And no smoke toxicity and drippings are generated during combustion.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and in particular to a fire-resistant high-speed data cable used in a data center system. Background Art

[0002] At present, the development of the global Internet of Things industry is still in the first stage, that is, the hardware cost is declining, the power consumption is reduced, and the number of Internet of Things connections is exploding. In this stage, applications such as smart home, smart security, and smart city have been implemented. For the data and energy transmission of information sensing devices such as infrared sensors, laser scanners, gas sensors, and Internet of Things terminal devices such as smart monitoring and smart bulbs under the Internet of Things, data cables are the most important solution. With the continuous development and upgrading of the Internet of Things and its applications, the demand for data cables and their connection products will continue to rise. The construction of global data centers has been in a period of rapid growth in recent years. Large data centers require a large number of high-speed transmission cables and their connection systems. At present, the domestic data center design specification GB50174-2017 stipulates that the horizontal subsystem that undertakes data services should use Category 6A and above twisted cables. At the same time, requirements are put forward for the flame retardant and fire resistance levels in the computer room. Data centers also put forward higher requirements for high-speed digital communication cables, especially in terms of broadband, low attenuation, high anti-interference, environmental resistance and high flame retardancy. How to strengthen the design, improve the process, and develop fire-resistant high-speed data cables that better meet the needs of data center systems is an important threshold for cable manufacturers. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art. The present invention is a fire-resistant high-speed data cable for use in a data center system. The cable adopts an oxygen-free copper conductor with a purity of 99.99%, which meets the requirements of lower transmission attenuation of the cable at low frequencies, improves the transmission rate of the wire core, and reduces the signal transmission attenuation. In order to prevent mutual interference between loops between line pairs, reduce mutual crosstalk between loops, and ensure the stability of high-frequency signal transmission, an aluminum-plastic fire-resistant graphene screen tape is used in the design.

[0004] In order to achieve the above-mentioned purpose, the present invention provides a fire-resistant high-speed data cable for use in a data center system, comprising a cable core, characterized in that: the cable core comprises an inner conductor and an inner sheath coated on the surface of the inner conductor; the two cable cores and the guide wire are a group to form a core twisted body, the core twisted body is longitudinally coated with a first shielding layer, and the first shielding layer is coated with a sheathing layer; six pairs of core twisted bodies are evenly arranged outside the sheathing layer to form a pair twisted body, and the pair twisted bodies are sequentially coated with a second shielding layer, a third shielding layer, a fire-resistant layer, and an outer sheath.

[0005] Furthermore, the wrapping layer completely fills the gaps between the core twisted bodies; the second shielding layer is wrapped around the wire pair twisted body, the third shielding layer is wrapped around the surface of the second shielding layer, the fire-resistant layer is extruded on the surface of the second shielding layer, and the outer sheath is extruded on the fire-resistant layer.

[0006] Furthermore, the inner protective layer is coated on the surface of the inner conductor with a foamed fusible polytetrafluoroethylene material, and the surface thereof is in a uniform honeycomb shape.

[0007] Furthermore, the first shielding layer is made of aluminum-plastic refractory graphene screen tape longitudinally wrapped on the surface of the inner protective layer.

[0008] Furthermore, the wrapping layer is made of polyester insulating tape wrapped around the surface of the first shielding layer.

[0009] Furthermore, the second shielding layer is made of aluminum-plastic fire-resistant graphene screen tape wrapped around the surface of the wire pair twisted body; the third shielding layer is made of tinned copper material woven into a metal mesh and covered 360 degrees on the surface of the second shielding layer.

[0010] Furthermore, the second shielding layer is made of tinned copper material and woven into a metal mesh to cover the surface of the third shielding layer 360 degrees.

[0011] Furthermore, the fire-resistant layer is formed by wrapping a fire-resistant glass fiber tape 360 ​​degrees around the surface of the second shielding layer.

[0012] Furthermore, the outer protective layer is made of fusible polytetrafluoroethylene material extruded on the surface of the fire-resistant layer.

[0013] Furthermore, the inner conductor is made of tin-plated oxygen-free copper conductor with a purity of 99.99%.

[0014] The beneficial effects of the present invention are: using a physically foamed fusible polytetrafluoroethylene insulation layer on the wire core structure greatly reduces the wire core dielectric constant, meets the low attenuation requirements of signal transmission, and improves the wire core transmission rate; the first shielding layer and the second shielding layer materials use aluminum-plastic refractory graphene screen tape materials to meet the requirements of high flame retardancy, temperature resistance, and acid and alkali corrosion resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] For ease of explanation, the present invention is described in detail with reference to the following preferred embodiments and the accompanying drawings.

[0016] Figure 1 It is a schematic diagram of the structure of a fire-resistant high-speed data cable used in a data center system of the present invention; In the figure: cable core-1, inner conductor-11, inner sheath-12, guide wire-13, core twisted body-2, first shielding layer-21, wrapping layer-22, second shielding layer-3, third shielding layer-4, fire-resistant layer-5, outer sheath-6. Implementation

[0017] The fire-resistant high-speed data cable for use in a data center system according to the present invention is further described below with reference to the accompanying drawings: Reference Figure 1 A fire-resistant high-speed data cable for use in a data center system comprises a cable core, comprising an inner conductor and an inner sheath coated on the surface of the inner conductor; the two cable cores and the guide wire are a group to form a core twisted body, the core twisted body is longitudinally coated with a first shielding layer, and the first shielding layer is coated with a sheathing layer; six pairs of core twisted bodies are evenly arranged outside the sheathing layer to form a pair twisted body, and the pair twisted bodies are sequentially coated with a second shielding layer, a third shielding layer, a fire-resistant layer, and an outer sheath.

[0018] The cable core includes a silver-plated copper inner conductor 11 and a fusible polytetrafluoroethylene inner sheath 12 coated on the outside of the inner conductor 11. The inner conductor 11 adopts a single silver-plated oxygen-free copper wire with a conductivity of 106%. The inner sheath 12 uses physically foamed fusible polytetrafluoroethylene to be extruded on the surface of the inner conductor 11, and its foaming degree is more than 50%. The insulating material is resistant to high temperature, and the foamed insulating layer has a small dielectric constant and stable performance. A guide wire 3 is provided between the cable core and the first shielding layer 21. The guide wire 13 is composed of multiple strands of tinned copper. The first shielding layer 21 uses an aluminum-plastic fire-resistant graphene screen tape to longitudinally wrap the core twisted body and the surface of the guide wire 3. The eight core twisted bodies and the wrapping layer form a wire pair twisted body. The structure forms the first shielding layer and the first fire-resistant layer. The wrapping layer 22 uses a layer of polyester insulating tape to wrap 360 degrees on the two core twisted bodies. The material properties are The material has excellent mechanical properties and high tensile strength, which ensures the stability of the internal structure of the battery core. The second shielding layer 3 is made of aluminum-plastic refractory graphene screen tape wrapped around the surface of the core twisted body to form a second shielding layer and a second refractory layer. The third shielding layer 4 uses a tinned copper wire braided mesh to cover the surface of the second shielding layer 3 at 360 degrees to form a third shielding layer. The refractory layer 5 uses a refractory glass fiber tape wrapped around the surface of the third shielding layer 4 to form a third refractory layer. The outer sheath 6 is made of fusible polytetrafluoroethylene material extruded on the surface of the refractory layer 5. This material will not produce thick smoke and other secondary hazards when burned, and can effectively protect personnel and property safety. The overall flame retardant performance of the cable meets the CMP-level flame retardant performance requirements of the Underwriters Laboratory of the United States, and it also has good high temperature resistance and acid and alkali corrosion resistance.

[0019] The traditional highly flame-retardant CMP-grade data cable uses solid-core polyperfluoroethylene propylene insulation with a transmission rate of 65%. The cable of the present invention uses physical foaming insulation, with a foaming rate of 50% and a transmission rate of 80%. The amount of insulation material used is 50% of the amount of solid-core polyperfluoroethylene propylene material used. When tested at a frequency of 24GMHz, its maximum attenuation value is less than 40dB / 100m, the minimum near-end crosstalk value is 30dB, and the dielectric strength is AC, 15KV, and there is no breakdown for 5min. The insulation resistance is ≥1000MΩ.km, and a polyolefin outer layer is extruded on the surface of the insulation layer to make its line pair structure more stable, and the differential impedance meets 90±15Ω during the rising edge time. Traditional data cables for LANs with a transmission bandwidth of 500MHz are designed with different pitches on the line pairs, and the mutual interference of signals between the line pairs is reduced by the line pair pitch difference balance principle. In order to improve electromagnetic compatibility, the cable of the present invention adopts a combination of three shielding layers and three fire-resistant layers on the shielding structure, that is, each pair of signal lines does not need to be twisted, that is, there is no pitch difference. This structure satisfies the equal delay difference of the line pairs. At the same time, a separate guide line is added to contact the line pair shielding layer. This structure has good electromagnetic compatibility. In addition, in order to ensure the stability and reliability of the cable core and reduce production costs, the outer shielding layer uses a double shielding structure, that is, a shielding body combining an aluminum-plastic fire-resistant graphene screen tape and a tinned copper metal mesh. This function is to meet the anti-interference capabilities of high and low frequency bands. The outer sheath material uses fusible polytetrafluoroethylene material to meet the requirements of high flame retardancy, temperature resistance, and acid and alkali corrosion resistance.

[0020] The above content and structure describe the basic principle, main features and advantages of the product of the present invention, which should be understood by those skilled in the art. The above examples and descriptions are only for explaining the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which are within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A fire-resistant high-speed data cable for use in a data center system, comprising a cable core, characterized in that: The cable core includes an inner conductor and an inner sheath coated on the surface of the inner conductor; the two cable cores and the guide wire form a group to form a core twisted body, the core twisted body is longitudinally wrapped with a first shielding layer, and the first shielding layer is wrapped with a sheathing layer; six pairs of core twisted bodies are evenly arranged outside the sheathing layer to form a pair twisted body, and the pair twisted bodies are sequentially coated with a second shielding layer, a third shielding layer, a fire-resistant layer and an outer sheath outside.

2. A fire-resistant high-speed data cable for use in a data center system according to claim 1, characterized in that: The wrapping layer completely fills the gaps between the core twisted bodies; the second shielding layer is wrapped around the wire pair twisted body, the third shielding layer is wrapped around the surface of the second shielding layer, the fire-resistant layer is extruded on the surface of the second shielding layer, and the outer sheath is extruded on the fire-resistant layer.

3. A fire-resistant high-speed data cable for use in a data center system according to claim 2, characterized in that: The inner protective layer is coated on the surface of the inner conductor with a foamed fusible polytetrafluoroethylene material, and the surface thereof is in a uniform honeycomb shape.

4. A fire-resistant high-speed data cable for use in a data center system according to claim 3, characterized in that: The first shielding layer is made of aluminum-plastic refractory graphene screen tape longitudinally wrapped on the surface of the inner protective layer.

5. A fire-resistant high-speed data cable for use in a data center system according to claim 4, characterized in that: The wrapping layer is wrapped around the surface of the first shielding layer with a polyester insulating tape.

6. A fire-resistant high-speed data cable for use in a data center system according to claim 5, characterized in that :The second shielding layer is made of aluminum-plastic refractory graphene screen tape wrapped around the surface of the wire pair twisted body; the third shielding layer is made of tinned copper material woven into a metal mesh in the form of 360 degrees wrapped around the surface of the second shielding layer.

7. A fire-resistant high-speed data cable for use in a data center system according to claim 6, characterized in that: The second shielding layer is made of tinned copper material and woven into a metal mesh in the form of a 360-degree covering on the surface of the third shielding layer.

8. A fire-resistant high-speed data cable for use in a data center system according to claim 7, characterized in that: The fire-resistant layer is formed by wrapping a fire-resistant glass fiber tape 360 ​​degrees around the surface of the second shielding layer.

9. A fire-resistant high-speed data cable for use in a data center system according to claim 8, characterized in that: The outer protective layer is made of fusible polytetrafluoroethylene material extruded on the surface of the fire-resistant layer.

10. A fire-resistant high-speed data cable for use in a data center system according to claim 9, characterized in that: The inner conductor is made of tin-plated oxygen-free copper conductor with a purity of 99.99%.

Images