Wire and 10-gigabit data transmission flame-retardant fireproof communication cable

Abstract

The invention discloses a wire and 10-gigabit data transmission flame-retardant fire-resistant communication cable, which comprises two stranded single core wires and an outer fire-resistant layer, wherein the outer fire-resistant layer coats the peripheries of the plurality of stranded single core wires; each single core wire comprises a conductor, an insulating layer wrapping the periphery of the conductor and an inner fireproof layer wrapping the periphery of the insulating layer. The insulating layer comprises an outer insulating layer and an inner insulating layer which are sequentially arranged from outside to inside, the outer insulating layer is an FEP layer formed by FEP extrusion molding, the inner insulating layer is an HDPE layer formed by HDPE extrusion molding, the outer insulating layer and the inner insulating layer respectively wrap the periphery of the inner insulating layer and the periphery of the conductor, and the outer insulating layer and the inner insulating layer respectively wrap the periphery of the conductor. And the periphery of the outer insulating layer is coated with the inner fireproof layer. The 10-gigabit data transmission flame-retardant fire-resistant communication cable has the characteristics of high flame retardance, high fire resistance, environmental friendliness, low manufacturing cost and the like.

Description

TECHNICAL FIELD

[0001] The application relates to a wire and a gigabit data transmission flame-retardant fire-resistant communication cable and belongs to the technical field of communication cables. BACKGROUND

[0002] In the case of fire, large venues, office buildings, hospitals, hotels, subway stations, minerals and other important public places have certain data transmission requirements for cables, and the data transmission cables can work normally within a certain time to provide valuable time for escape, automatic alarm, starting of fire-fighting facilities, rescue and use of emergency equipment. The flame-retardant fire-resistant communication cable is a special cable specially designed to maintain smooth signal transmission in the case of fire, and has high flame-retardant and fire-resistant properties.

[0003] FEP material is widely used to manufacture data communication cables meeting the CMP level due to its excellent flame retardance, high temperature resistance and low dielectric loss. Such cables can maintain signal transmission function for a certain time under flame conditions, meeting strict fireproof requirements. However, FEP material releases fluorides (such as perfluorooctanoic acid) in the production process, which causes potential harm to the environment and human health, and FEP waste is difficult to naturally degrade, which does not meet the green manufacturing requirements. In addition, the expensive FEP raw material leads to high overall cost of the cable, which weakens the market competitiveness of enterprises. SUMMARY

[0004] The application aims to provide a wire and a gigabit data transmission flame-retardant fire-resistant communication cable, which has high flame retardance, high fire resistance, environmental protection and low manufacturing cost.

[0005] The application is achieved by the following technical scheme.

[0006] A wire comprises two twisted single-core wires and an outer fire-resistant layer covering the outer periphery of the twisted single-core wires, wherein the single-core wire comprises a conductor, an insulating layer covering the outer periphery of the conductor, and an inner fire-resistant layer wrapped around the outer periphery of the insulating layer; the insulating layer comprises an outer insulating layer and an inner insulating layer arranged in sequence from the outside to the inside, the outer insulating layer is an FEP layer formed by FEP extrusion molding, the inner insulating layer is an HDPE layer formed by HDPE extrusion molding, the outer insulating layer and the inner insulating layer are respectively covered on the outer periphery of the inner insulating layer and the outer periphery of the conductor, and the inner fire-resistant layer is covered on the outer periphery of the outer insulating layer.

[0007] As a further improvement of the application, the outer fire-resistant layer and the inner fire-resistant layer are both mica tape layers.

[0008] As a further improvement of the application, the thickness of the outer insulating layer is 0.1-0.2 mm.

[0009] As a further improvement of the present invention, the thickness ratio of the outer insulating layer to the inner insulating layer is ≤ (2:3).

[0010] The present invention also provides a 10 Gigabit data transmission flame-retardant and fire-resistant communication cable, including an outer sheath and at least one of the said conductors located inside the outer sheath.

[0011] As a further improvement of the present invention, the outer periphery of the conductor is covered with a shielding layer.

[0012] As a further improvement of the present invention, the outer sheath is provided with a braided layer.

[0013] As a further improvement of the present invention, at least one drainage line is placed in the braided layer.

[0014] As a further improvement of the present invention, the outer sheath is made of a low-smoke, halogen-free material.

[0015] As a further improvement of the present invention, the outer sheath is provided with four wires, and the twist pitch of the two single-core wires in each wire is different.

[0016] The beneficial effects of this invention are:

[0017] 1. In the event of a fire, the outer fire-resistant layer covering the two twisted single-core wires forms the first line of fire protection, effectively protecting the internal single-core wires from direct impact and high-temperature attack by external flames. Furthermore, the inner fire-resistant layer, individually covering each single-core wire, forms the second line of fire protection. Even if the outer fire-resistant layer is damaged by fire, each individual single-core wire can still maintain its insulation and communication capabilities for a period of time thanks to the inner fire-resistant layer. Thus, the inner and outer fire-resistant layers complement each other, greatly enhancing the overall fire resistance of the conductor. Simultaneously, the outer insulation layer, made of fluorinated ethylene propylene copolymer, forms the third line of fire protection. It protects the inner insulation layer even when both the outer and inner fire-resistant layers are damaged, thereby maintaining the conductor's data transmission capability and further improving its fire resistance.

[0018] 2. Fluorinated ethylene propylene copolymer and high-density polyethylene compound have similar dielectric constants. Their combined use has minimal impact on the overall impedance performance of the data communication cable, which is beneficial for stable signal transmission quality. Furthermore, compared to existing technologies that use fluorinated ethylene propylene copolymer as the insulation layer, this invention uses a combination of an outer insulation layer of fluorinated ethylene propylene copolymer and an inner insulation layer of high-density polyethylene compound. This reduces the amount of fluorinated ethylene propylene copolymer used, thereby reducing fluoride emissions and making it more environmentally friendly. Moreover, since the price of high-density polyethylene compound is significantly lower than that of fluorinated ethylene propylene copolymer, the manufacturing cost of the conductor can be significantly reduced while ensuring the fire resistance and signal transmission reliability of the conductor, thus enhancing the company's competitiveness. Attached Figure Description

[0019] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings to aid in understanding the objectives and advantages of the present invention, wherein:

[0020] Figure 1 This is a schematic diagram of the conductor structure;

[0021] Figure 2 This is a schematic diagram of a single-core wire.

[0022] Figure 3 This is a schematic diagram of the structure of a flame-retardant and fire-resistant communication cable for 10 Gigabit data transmission. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0024] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly used in this specification are defined relative to the construction shown in the accompanying drawings. The terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively. These are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive.

[0025] Example 1:

[0026] A conductor for manufacturing data transmission communication cables, see reference. Figures 1-2It includes two twisted single-core wires 1 and an outer fire-resistant layer 2 covering the outer periphery of the two twisted single-core wires 1; the single-core wire 1 includes a conductor 11, an insulation layer 12 covering the outer periphery of the conductor 11, and an inner fire-resistant layer 13 wrapped around the outer periphery of the insulation layer 12; the insulation layer 12 includes an outer insulation layer 121 and an inner insulation layer 122 arranged sequentially from the outside to the inside, the outer insulation layer 121 is an FEP layer extruded by FEP, the inner insulation layer 122 is an HDPE layer extruded by HDPE, the outer insulation layer 121 and the inner insulation layer 122 respectively cover the outer periphery of the inner insulation layer 122 and the outer periphery of the conductor 11, and the inner fire-resistant layer 13 covers the outer periphery of the outer insulation layer 121.

[0027] Specifically, FEP is a fluorinated ethylene propylene copolymer, which has excellent electrical insulation and high temperature resistance, with a long-term operating temperature of -200℃ to 200℃ and a thermal decomposition temperature above 400℃; HDPE is a high-density polyethylene compound, whose continuous operating temperature usually does not exceed 100℃.

[0028] In the event of a fire, the outer fire-resistant layer 2 covering the twisted single-core wires 1 forms the first line of fire protection, effectively protecting the single-core wires 1 inside the conductor m from direct impact and high-temperature attack by external flames. Furthermore, the inner fire-resistant layer 13, individually covering each single-core wire 1, forms the second line of fire protection. Even if the outer fire-resistant layer 2 is damaged by fire, each individual single-core wire 1 can still maintain communication capability for a period of time thanks to the inner fire-resistant layer 13. The inner fire-resistant layer 13 complements the outer fire-resistant layer 2, greatly enhancing the overall fire resistance of the conductor m. Simultaneously, the outer insulation layer, made of FEP, forms the third line of fire protection, protecting the inner insulation layer 122 when the outer fire-resistant layer 2 and the inner fire-resistant layer 13 are damaged, thereby maintaining the data transmission capability of the conductor m and further improving its fire resistance.

[0029] Furthermore, FEP has a dielectric constant of approximately 2.1, while HDPE has a dielectric constant of approximately 2.3. Since their dielectric constants are close, their combined use has minimal impact on the overall impedance performance of the communication cable, which is beneficial for stable signal transmission quality. Moreover, compared to existing technologies that use FEP entirely as the insulation layer 12, this invention uses a combination of an outer FEP layer and an inner HDPE layer to form the insulation layer 12. This reduces the amount of FEP used, thereby reducing fluoride emissions during production, making it more environmentally friendly and in line with the concept of green manufacturing. On the other hand, since HDPE is significantly cheaper than FEP, it can significantly reduce the manufacturing cost of the conductor m while meeting the requirements for cable fire resistance, flame retardancy, and signal transmission reliability, thus enhancing the company's competitiveness.

[0030] In this embodiment, both the outer refractory layer 2 and the inner refractory layer 13 are mica tape layers, which are formed by wrapping mica tape around the surface. The mica tape is composed of mica minerals, which have extremely high heat resistance, a fire resistance temperature of over 750°C, good flame retardant properties, and good insulation properties.

[0031] More specifically for a single-core wire, the diameter of conductor 11 is 0.58 mm, the overall thickness of insulation layer 12 is ≥0.25 mm, the thickness of outer insulation layer 121 is 0.1~0.2 mm, the thickness of inner insulation layer is ≤0.15 mm, and the thickness ratio of outer insulation layer 121 to inner insulation layer 122 is ≤(2:3).

[0032] Furthermore, when the thickness ratio of the outer insulation layer 121 to the inner insulation layer 122 is 2:3, the thickness of the insulation layer 12 is 0.25 mm, the thickness of the outer insulation layer 121 is 0.1 mm, and the thickness of the inner insulation layer 122 is 0.15 mm. In this case, the communication cable can pass the flame propagation distance and smoke optical density tests described in the National Fire Protection Association's "Standard Test Methods for Flame Propagation and Smoke in Wires and Cables for Air Handling Spaces" (NFPA 262-2023) and the line integrity tests described in the International Electrotechnical Commission's IEC 60331-2 standard. Therefore, the minimum thickness of the outer insulation layer in the insulation layer 12 is 0.1 mm. This insulation layer 12 structure can minimize the amount of FEP material used while meeting the fire resistance performance and signal transmission reliability requirements of the conductor m, thereby reducing the manufacturing cost of the conductor m.

[0033] Example 2:

[0034] A flame-retardant and fire-resistant communication cable for 10 Gigabit data transmission, as per reference. Figures 1-3 The cable includes an outer sheath 3 and at least one conductor m as described in Embodiment 1, located within the outer sheath 3. The outer sheath 3 is the outermost layer of the communication cable and provides mechanical protection, moisture protection, corrosion protection, and flame retardancy to the conductor m inside the cable. The conductor m is used to transmit electrical signals. Specifically, the outer sheath 3 is obtained by extrusion molding of a low-smoke halogen-free material. In a fire, the low-smoke halogen-free material produces extremely low smoke when burning, which can significantly improve the fire scene environment and buy valuable time for personnel evacuation and fire rescue. For example, the low-smoke halogen-free material used is commercially available material of model HW495-2.

[0035] More specifically for communication cables, the outer sheath 3 contains four conductors m, and the twist pitch of the two single-core wires 1 in each conductor m is different. The different twist pitches of the four conductors m can effectively prevent the regular electromagnetic coupling of adjacent conductors m at the same position, thereby minimizing crosstalk.

[0036] In this embodiment, the 10 Gigabit data transmission flame-retardant and fire-resistant communication cable has the characteristics of high flame retardancy, high fire resistance, environmental friendliness, and low manufacturing cost.

[0037] In this embodiment, since data communication cables are typically used in environments such as data centers, enterprise networks, and industrial manufacturing, these scenarios often contain electromagnetic interference sources, which can affect the stability of cable data transmission. Therefore, to improve the shielding capability of the conductors against external electromagnetic interference, each conductor m is covered with a shielding layer 5. The shielding layer 5, as a shielding layer, covers the outer fire-resistant layer of the conductor m. The shielding layer 5 is formed by wrapping aluminum foil layer by layer. The shielding layer 5 can block the intrusion of external electromagnetic waves, prevent signal loss, and ensure high-quality signal transmission. On the other hand, it can prevent the signals transmitted inside the cable from generating electromagnetic radiation that interferes with other equipment. In addition, the aluminum foil can effectively block the penetration of moisture and oxygen, prevent the conductor 11 from oxidizing and corroding, provide a physical barrier for the metal conductor 11 inside the cable, and extend the service life of the communication cable.

[0038] In this embodiment, the outer sheath 3 is provided with a braided layer 4, which is a mesh structure made of multiple interwoven metal wires. The braided layer 4 can enhance the tensile strength, bending resistance and physical protection of the cable. The braided layer 4 wraps around the outer periphery of the multiple conductors m after cabling, forming a buffer layer to prevent damage to the insulation layer 12 or deformation of the conductor 11, thereby protecting the electrical performance of the communication cable. In addition, the braided layer 4 and the shielding layer 5 together form a double-layer shielding effect, which can fully resist external electromagnetic interference and ensure the stability of cable data transmission.

[0039] Furthermore, at least one drain wire 6 is placed within the braided layer 4. The drain wire 6 is in close contact with the shielding layer 5 outside the conductor m and the braided layer 4. The drain wire 6 is a metal conductor 1 that can be grounded, thereby conducting the electromagnetic interference collected by the braided layer to the ground. The drain wire also serves to discharge static electricity. It should be noted that a drain wire is also placed within the shielding layer 5 of each conductor m to ensure that each conductor m can be effectively grounded and discharge static electricity.

[0040] Performance testing:

[0041] This embodiment tests the flame retardant performance and circuit integrity performance (fire resistance) of the 10 Gigabit data transmission flame-retardant and fire-resistant communication cable described in Embodiment 2. The flame retardant performance test was conducted according to the test method described in the National Fire Protection Association (NFPA) standard test method for flame propagation and smoke in wires and cables for air handling spaces (NFPA 262-2023). The circuit integrity performance test was conducted according to the test method described in the International Electrotechnical Commission (IEC) standard 60331-2. The communication cable used in the test has an insulation layer 12 thickness of 0.25 mm, an outer insulation layer 121 thickness of 0.1 mm, an inner insulation layer 122 thickness of 0.15 mm, and a conductor diameter of 0.58 mm.

[0042] The table below shows the test results for the flame retardant performance and circuit integrity (fire resistance) of the communication cables. Serial Number Item Test Condition Test Standard Test Result 1 Flame Propagation Distance and Smoke Optical Density Test 1. Flame Condition: 86 kilowatt dual port gas burner with a flame length of 1.37 meters; 2. Flame exposure time: 20 minutes; 3. Initial air flow velocity in the test chamber was 73 meters / minute (240 feet / minute) NFPA 262 Pass 2 Circuit Integrity Test - Electrical Continuity 1. Flame temperature: not less than 830°C; 2. Flame exposure time: 120 minutes; 3. Apply rated voltage to the cable IEC 60331-2 (for data cables) Pass 3 Circuit Integrity Test - Signal Transmission 1. Flame temperature: not less than 830°C; 2. Flame exposure time: 120 minutes; 3. Apply signal to the cable and monitor in real time IEC 60331-2 (for data cables) Pass

[0043] The test results above show that the communication cable in Example 2 can meet the requirements of flame retardant performance and circuit integrity, and meet the user's needs for the safety and signal transmission reliability of the communication cable.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A wire, characterized by The wire includes two single core wires (1) and an outer fireproof layer (2) covering the two single core wires (1); the single core wire (1) includes a conductor (11), an insulation layer (12) covering the outer periphery of the conductor (11), and an inner fireproof layer (13) covering the outer periphery of the insulation layer (12); the insulation layer (12) includes an outer insulation layer (121) and an inner insulation layer (122) arranged from outside to inside; the outer insulation layer (121) is an FEP layer formed by FEP extrusion molding; the inner insulation layer (122) is an HDPE layer formed by HDPE extrusion molding; the outer insulation layer (121) and the inner insulation layer (122) cover the outer periphery of the inner insulation layer (122) and the outer periphery of the conductor (11), respectively; and the inner fireproof layer (13) covers the outer periphery of the outer insulation layer (121).

2. A wire according to claim 1, characterized in that The outer fireproof layer (2) and the inner fireproof layer (13) are both mica tape layers.

3. A wire according to claim 1, wherein The thickness of the outer insulation layer (121) is 0.1-0.2 mm.

4. The wire of claim 1, wherein The thickness ratio of the outer insulation layer (121) and the inner insulation layer (122) is less than or equal to (2:3).

5. A 10 gigabit data transmission fire-retardant and fire-resistant communication cable, characterized by The wire includes an outer sheath (3) and a plurality of wires according to any one of claims 1-4 in the outer sheath (3).

6. A 10 gigabit data transmission fire-retardant and fire-resistant communication cable according to claim 5, wherein, The outer periphery of the wire is covered with a shielding layer (5).

7. A 10 gigabit data transmission fire-retardant and fire-resistant communication cable according to claim 5, wherein, The outer sheath (3) is provided with a braided layer (4).

8. A 10 gigabit data transmission fire-retardant and fire-resistant communication cable according to claim 7, wherein, At least one drain wire (6) is placed in the braided layer (4).

9. A 10 gigabit data transmission fire-retardant and fire-resistant communication cable according to claim 5, wherein, The outer sheath (3) is made of low-smoke halogen-free material.

10. A 10 gigabit data transmission fire-retardant and fire-resistant communication cable according to claim 5, wherein, The outer sheath (3) is provided with four wires, and the lay distance of the two single core wires (1) in each wire is different.

Images