CN114999729A - Low-smoke halogen-free flame-retardant coaxial cable with characteristic impedance of 50 omega for rail transit - Google Patents

Low-smoke halogen-free flame-retardant coaxial cable with characteristic impedance of 50 omega for rail transit Download PDF

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CN114999729A
CN114999729A CN202210443584.4A CN202210443584A CN114999729A CN 114999729 A CN114999729 A CN 114999729A CN 202210443584 A CN202210443584 A CN 202210443584A CN 114999729 A CN114999729 A CN 114999729A
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layer
outer conductor
conductor layer
low
coaxial cable
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袁保平
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Nanjing Quanxin Cable Technology Co Ltd
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Nanjing Quanxin Cable Technology Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B11/00—Communication cables or conductors
    • H01B11/18—Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor
    • H01B11/1895—Particular features or applications
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B11/00—Communication cables or conductors
    • H01B11/18—Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor
    • H01B11/1834—Construction of the insulation between the conductors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/02—Disposition of insulation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/29—Protection against damage caused by extremes of temperature or by flame
    • H01B7/292—Protection against damage caused by extremes of temperature or by flame using material resistant to heat
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00—Adapting or protecting infrastructure or their operation

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Abstract

The invention discloses a low-smoke halogen-free flame-retardant coaxial cable with characteristic impedance of 50 omega for rail transit, which comprises an inner conductor, a foaming insulating layer, a first outer conductor layer, a second outer conductor layer and a sheath layer which are coaxially arranged, wherein the foaming insulating layer wraps the inner conductor to serve as a high-frequency signal transmission line core, aluminum foil longitudinally wraps the high-frequency signal transmission line core to serve as the first outer conductor layer, a woven structure is arranged outside the first outer conductor layer to serve as the second outer conductor layer, so that a composite outer conductor layer is formed by the composite outer conductor layer and the first outer conductor layer, and the sheath layer is arranged outside the composite outer conductor layer. The coaxial cable is light in weight and low in signal attenuation, and can meet the requirements of low smoke, zero halogen, flame retardance, low toxicity, oil resistance and the like of rail transit vehicles.

Description

Low-smoke halogen-free flame-retardant coaxial cable with characteristic impedance of 50 omega for rail transit
Technical Field
The invention mainly relates to the technical field of cables for rail transit, in particular to a low-smoke halogen-free flame-retardant coaxial cable with characteristic impedance of 50 omega for rail transit.
Background
With the development of the rail transit industry, the transmission capacity requirement of data signal transmission in vehicles is greater and greater, the common communication cable cannot meet the data requirement of rail transit vehicles in some applications, and the coaxial cable can solve the application requirement of some parts of the rail transit vehicles due to the higher data transmission capacity of the coaxial cable, but the coaxial cable specially designed for the application of the rail transit vehicles does not exist in the existing market, and cannot meet the use environment of urban rail transit vehicles.
Therefore, a coaxial cable which is light in weight, has low signal attenuation and can meet the requirements of low smoke, halogen-free, flame retardant, low toxicity, oil resistance and the like of the rail transit vehicle is urgently needed in the application of the rail transit vehicle.
Disclosure of Invention
In order to solve the problem that the conventional coaxial cable cannot meet the application requirements of the rail transit industry and break through the monopoly of foreign technologies, the invention provides the low-smoke halogen-free flame-retardant coaxial cable for the rail transit with the characteristic impedance of 50 ohms, which has light weight and low signal attenuation and can meet the requirements of low smoke, halogen-free, flame-retardant, low-toxicity, oil resistance and the like of rail transit vehicles.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the utility model provides a low smoke and zero halogen flame retardant coaxial cable and preparation technology for track traffic of characteristic impedance 50 omega, inner conductor, foaming insulation layer, first outer conductor layer, second outer conductor layer and restrictive coating including coaxial setting, foaming insulation layer parcel inner conductor is as high frequency signal transmission sinle silk, high frequency signal transmission sinle silk indulges outward and wraps the aluminium foil as first outer conductor layer, first outer conductor layer is equipped with outward and weaves the structure as second outer conductor layer to form compound outer conductor layer with first outer conductor layer, compound outer conductor layer is equipped with the restrictive coating outward.
Further, the inner conductor is of a silver-coated copper-clad aluminum structure and is divided into an inner aluminum layer, a middle copper layer and an outer silver coating, the copper-coated aluminum conductor is drawn by adopting double-metal conductor processing equipment, and a layer of silver is coated outside the conductor, so that the inner conductor is formed, the volume of the inner aluminum layer accounts for 71%, the volume of the middle copper layer accounts for 28.5%, the volume of the outer silver coating accounts for 0.5%, the thickness of the middle copper layer is 0.2mm, and the thickness of the outer silver coating is 1-1.5 μm.
Further, the foamed insulation layer is a polyethylene foamed insulation layer extruded by foaming extrusion equipment for the inner conductor, and the foaming degree is 40% -50%.
Furthermore, the first outer conductor layer is of an aluminum-plastic composite tape longitudinal wrapping structure, a layer of aluminum foil is longitudinally wrapped outside the foaming insulating layer by a knitting machine, and the longitudinal wrapping and covering rate is greater than 15%.
Furthermore, the second outer conductor layer is in a weaving type with a plated copper wire, a plated round copper wire is adopted, and the weaving density is 80%.
Furthermore, the sheath layer is formed by extruding a low-smoke halogen-free flame-retardant polyolefin material outside the composite outer conductor layer and performing irradiation crosslinking through an electron accelerator, the substrate of the sheath layer is EVA or POE substrate, and 30-40% of nitrogen oxide or hydroxide flame retardant, 0.5% of antioxidant and 0.6% of plasticizer are added.
Compared with the prior art, the invention has the following beneficial effects:
1. remarkable weight reduction effect
The inner conductor adopts a bimetal copper-clad aluminum structure, and the density of copper is 8.9g/cm 3 Density of aluminum 2.7g/cm 3 And the volume of the aluminum is over 70 percent, so that the weight reduction effect is obvious compared with the traditional copper structure coaxial cable.
The weight of the insulating layer is obviously reduced by the insulating foaming process; the weight of the coaxial cable produced by the invention is 20-25% lighter than that of the similar coaxial cable.
2. The attenuation performance is more excellent
In high-frequency data signal transmission, according to the skin effect theory, the radio frequency signal of coaxial cable mainly propagates at the inner conductor surface, consequently the inner conductor surface in this patent scheme plates the silver that the one deck resistance is littleer, can effectively strengthen the signal transmission effect, reduces because of the signal attenuation influence that the skin effect caused, and the attenuation improvement effect is obvious.
3. Excellent high and low temperature resistance:
after the polyolefin sheath material is irradiated, the polyolefin sheath material is converted from thermoplastic into an insoluble and infusible state, so that the heat resistance of the polyolefin sheath material is obviously improved, and the long-term working temperature of the cable reaches 90 ℃ from 70 ℃. Meanwhile, the cable can be normally laid and installed at the temperature of minus 40 ℃, so that the problems of hardening, brittle fracture and the like of polar materials such as PVC, CSM and the like due to low-temperature laying can be solved, and the use and installation in cold regions such as northeast and the like are met.
Drawings
Fig. 1 is a schematic structural view of a coaxial cable of the present invention;
wherein, 1-an inner conductor; 2-foaming an insulating layer; 3-a first outer conductor layer; 4-a second outer conductor layer; 5-sheath layer.
Detailed Description
The preferred mechanisms and methods of motion realization of the present invention are further described below in conjunction with the figures and the detailed description.
As shown in fig. 1, for a fire-retardant coaxial cable of low smoke and zero halogen of track traffic of characteristic impedance 50 omega, including inner conductor 1, foaming insulation layer 2, first outer conductor layer 3, second outer conductor layer 4 and restrictive coating 5 of coaxial setting, foaming insulation layer 2 parcel inner conductor 1 is as the high frequency signal transmission sinle silk, high frequency signal transmission sinle silk is indulged outward and is wrapped up the aluminium foil as first outer conductor layer 3, first outer conductor layer 3 is equipped with outward and weaves the structure as second outer conductor layer 4 to form compound outer conductor layer with first outer conductor layer 3, be equipped with restrictive coating 5 outside the compound outer conductor layer.
The inner conductor 1 is a silver-coated copper-clad aluminum structure and is divided into three layers, namely an inner aluminum layer, a middle copper layer and an outer silver layer, a copper-coated aluminum conductor is drawn by adopting double-metal conductor processing equipment, and a layer of silver is coated outside the conductor, so that the inner conductor 1 is formed, the volume of the inner aluminum layer accounts for 71%, the volume of the middle copper layer accounts for 28.5%, the volume of the outer silver layer accounts for 0.5%, the thickness of the middle copper layer is about 0.2mm, the thickness of the outer silver layer is 1 mu m-1.5 mu m, and the weight of the double-metal conductor of the copper-coated aluminum structure is 30% -40% lighter than that of the inner conductor of the single-copper structure.
The foamed insulation layer 2 is a polyethylene foamed insulation layer extruded by an external foaming extrusion device on the inner conductor 1, the foaming degree is generally controlled to be 40-50%, the dielectric constant of the foamed insulation layer can be reduced to about 1.7 from 2.3, and the weight of the foamed insulation layer is reduced by about 40-50%.
The first outer conductor layer 3 is of an aluminum-plastic composite tape longitudinal wrapping structure, a layer of aluminum foil is longitudinally wrapped outside the foaming insulating layer 2 by a knitting machine, namely the longitudinally wrapped aluminum foil forms the first outer conductor layer, the thickness of the aluminum foil and the thickness of the aluminum base are selected according to needs, and the longitudinal wrapping covering rate is larger than 15%.
The second outer conductor layer 4 is a braided type with a plated copper wire, a braiding machine is adopted to braid a copper wire outside the first outer conductor layer 3, so that the second outer conductor layer 4 is formed, the second outer conductor layer 4 generally adopts a plated round copper wire, and the braiding density is about 80%.
And the first outer conductor layer 3 and the second outer conductor layer 4 are wrapped outside the high-frequency signal transmission wire core to form a composite outer conductor layer.
The sheath layer 5 is formed by extruding a low-smoke halogen-free flame-retardant polyolefin material outside the composite outer conductor layer and performing irradiation crosslinking through an electron accelerator, so that a sheath layer is formed, the extrusion temperature of the sheath (the first zone is 80 +/-5 ℃, the second zone is 100 +/-5 ℃, the third zone is 120 +/-5 ℃, the fourth zone is 150 +/-5 ℃, the head is 160 +/-5 ℃ and the flange is 180 +/-5 ℃) is selected according to actual requirements, the base material of the sheath layer 5 can be EVA or POE base material, 30-40% of nitrogen oxide or hydroxide flame retardant, 0.5% of antioxidant, 0.6% of plasticizer and other additives are added, the toxicity of smoke is not more than 5, the thermal extension is not more than 50%, the tensile strength is not less than 10MPa, and the elongation at break is not less than 125%.
The low-smoke halogen-free flame-retardant coaxial cable for rail transit with the characteristic impedance of 50 Ω in the embodiment has the following typical properties:
Figure BDA0003614375870000031
Figure BDA0003614375870000041
the low-smoke halogen-free flame-retardant coaxial cable for rail transit with the characteristic impedance of 50 ohms provided by the embodiment is lighter in weight: the weight of the bimetallic conductor of the copper-clad aluminum structure is 30-40% lighter than that of the inner conductor of the copper structure; the attenuation performance is better: the structure of the double-metal inner conductor with silver plating and the composite outer conductor effectively reduces the attenuation of high-frequency signal transmission, and the attenuation index can be optimized by 10-30%.
Finally, it should be noted that: although the present invention has been described in detail with reference to the embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.

Claims (6)

1. The utility model provides a low smoke and zero halogen flame retardant coaxial cable is used in track traffic of characteristic impedance 50 omega, a serial communication port, inner conductor (1), foaming insulation layer (2), first outer conductor layer (3), second outer conductor layer (4) and restrictive coating (5) including coaxial setting, foaming insulation layer (2) parcel inner conductor (1) is as high frequency signal transmission sinle silk, high frequency signal transmission sinle silk indulges outward and wraps up the aluminium foil as first outer conductor layer (3), first outer conductor layer (3) are equipped with outward and weave the structure as second outer conductor layer (4) to form compound outer conductor layer with first outer conductor layer (3), compound outer conductor layer is equipped with restrictive coating (5) outward.
2. The low-smoke halogen-free flame-retardant coaxial cable for rail transit with the characteristic impedance of 50 ohms as claimed in claim 1, wherein the inner conductor (1) is a silver-plated copper-clad aluminum structure which is divided into an inner aluminum layer, a middle copper layer and an outer silver layer, a bimetallic conductor processing device is adopted to draw a copper-clad aluminum conductor and plate a layer of silver outside the conductor, so that the inner conductor (1) is formed, the volume of the inner aluminum layer accounts for 71%, the volume of the middle copper layer accounts for 28.5%, the volume of the outer silver layer accounts for 0.5%, the thickness of the middle copper layer is 0.2mm, and the thickness of the outer silver layer is 1 μm-1.5 μm.
3. The low-smoke halogen-free flame-retardant coaxial cable for rail transit with the characteristic impedance of 50 omega as claimed in claim 1, wherein the foamed insulating layer (2) is a polyethylene foamed insulating layer extruded by external foaming extrusion equipment on the inner conductor (1), and the foaming degree is 40% -50%.
4. The low-smoke halogen-free flame-retardant coaxial cable for rail transit with the characteristic impedance of 50 omega as claimed in claim 1, wherein the first outer conductor layer (3) is of an aluminum-plastic composite tape longitudinally-wrapped structure, a layer of aluminum foil is longitudinally wrapped outside the foamed insulating layer (2) by a knitting machine, and the longitudinally-wrapped overlapping rate is more than 15%.
5. The low-smoke halogen-free flame-retardant coaxial cable with characteristic impedance of 50 Ω for rail transit according to claim 1, characterized in that the second outer conductor layer (4) is a woven pattern of copper wires with plating layers, and a round copper wire with plating layers is adopted, and the weaving density is 80%.
6. The low-smoke halogen-free flame-retardant coaxial cable for rail transit with the characteristic impedance of 50 omega as claimed in claim 1, wherein the sheath layer (5) is formed by extruding a low-smoke halogen-free flame-retardant polyolefin material outside the composite outer conductor layer and performing irradiation crosslinking through an electron accelerator, the base material of the sheath layer (5) is EVA or POE base material, and 30-40% of nitrogen oxide or hydroxide flame retardant, 0.5% of antioxidant and 0.6% of plasticizer are added.
CN202210443584.4A 2022-04-25 2022-04-25 Low-smoke halogen-free flame-retardant coaxial cable with characteristic impedance of 50 omega for rail transit Pending CN114999729A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115862961A (en) * 2023-02-28 2023-03-28 天津六0九电缆有限公司 Transmission cable with adjustable impedance and capable of being assembled quickly and manufacturing method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115862961A (en) * 2023-02-28 2023-03-28 天津六0九电缆有限公司 Transmission cable with adjustable impedance and capable of being assembled quickly and manufacturing method

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