Salt-mist-resistant high-water-resistance bending-resistant seamless aluminum extruded tube coaxial cable

Abstract

The utility model relates to a cable, and aims to provide a salt-fog-resistant high-water-blocking bending-resistant seamless aluminum extruded tube coaxial cable, which has the characteristics of salt fog resistance, corrosion resistance, good water-blocking property and small bending-resistant radius. According to the technical scheme, the salt-mist-resistant high-water-resistance bending-resistant seamless aluminum extruded tube coaxial cable comprises an inner conductor, and an insulating inner layer, an insulating foaming layer, a shielding layer and a sheath layer which are sequentially coated outside the inner conductor from inside to outside, the cable is characterized in that the inner conductor is made of high-strength copper-clad aluminum, the insulating inner layer is a salt-mist-resistant low-density polyethylene insulating layer, the insulating foaming layer is a physical foaming polyethylene layer, the shielding layer is a seamless aluminum tube, and the sheath layer is a vinyl chloride layer. An insulating outer surface bonding layer is arranged between the insulating foaming layer and the shielding layer, a waterproof layer is arranged between the shielding layer and the sheath layer, and a waterproof layer is arranged between the shielding layer and the sheath layer.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of cable, in particular to salt fog resistance high water resistance bend-resistant seamless aluminium extrusion pipe coaxial cable. BACKGROUND

[0002] Seamless aluminium extrusion pipe type coaxial cable is used as a kind of large size 75Ω signal transmission cable, for transmitting analog or digital signal, mainly applied to the main line long distance transmission network engineering of CATV cable television system, it has good high-frequency attenuation, lower return loss, excellent shielding performance and other electrical characteristics and excellent mechanical tensile characteristics, so it has a large number of applications in domestic and foreign broadcast television networks.Its construction mode is mainly divided into outdoor overhead installation and low direct-buried laying, so the cable use environment is relatively complex and changeable, and is relatively harsh, often strong wind blows, rain water sprays, and moisture intrusion occurs;And limited by laying terrain and space, to avoid obstacles during cable installation, there is bending wiring condition, so the overall salt fog resistance, water resistance, tensile resistance and bend-resistant characteristics of the cable are required very high.The traditional seamless aluminium extrusion pipe coaxial cable is difficult to meet the above requirements simultaneously. SUMMARY

[0003] The utility model aims at overcoming the insufficient in the above background technical, provide a kind of salt fog resistance high water resistance bend-resistant seamless aluminium extrusion pipe coaxial cable, the cable should have the characteristics of salt fog resistance corrosion resistance, good water resistance, small bend radius.

[0004] The utility model discloses a technical scheme for;

[0005] A kind of salt fog resistance high water resistance bend-resistant seamless aluminium extrusion pipe coaxial cable, including inner conductor and the insulating inner layer, insulating foamed layer, shielding layer and sheath layer covered in inner conductor outer portion sequentially from inner to outer;Characterized in that: the inner conductor is high-strength copper-clad aluminium, the insulating inner layer is salt fog resistance low-density polyethylene material insulating layer, the insulating foamed layer is physical foamed polyethylene material layer, the shielding layer is seamless aluminium pipe, the sheath layer is vinyl chloride layer;Insulating foamed layer and shielding layer between the setting have insulating outer layer surface adhesive layer, shielding layer and sheath layer between the setting have water barrier layer, shielding layer and sheath layer between the setting have water barrier layer.

[0006] The adhesive layer is formed by ethylene acrylic acid copolymer (Ethylene Acrylic Acid, abbreviated as EAA).

[0007] The water barrier layer is formed by waterproof ointment.

[0008] The utility model has the advantages that:

[0009] 1) The adhesive layer coated on the outer surface of the inner conductor layer and the outer surface of the insulating foaming layer is selected from ethylene acrylic acid (EAA), which has excellent adhesive properties and can form an adhesive with aluminum, copper and other materials under high temperature, so that the inner conductor, the insulating foaming layer, the outer conductor layer of the aluminum pipe and the sheath layer form a seamless and compact whole through adhesion, so that the cable can prevent rain and moisture from entering while realizing the bending resistance effect;

[0010] 2) The insulating inner layer material is selected from salt spray resistant low density polyethylene, the shielding layer is further coated with an oil paste water blocking layer, and the sheath material is selected from high water resistance polyethylene material. The double water blocking and protection design makes the cable have good water resistance and corrosion resistance, so that the copper clad aluminum inner conductor and the aluminum pipe outer conductor are not corroded, thereby ensuring the stability and reliability of the electrical signal transmission;

[0011] 3) The inner conductor of the utility model is selected from high-strength hard copper clad aluminum, and the outer conductor is made of thick-walled seamless aluminum extrusion pipe, so that the cable has excellent tensile properties under the characteristics of good electrical transmission and shielding. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a front view structural schematic diagram of the utility model.

[0013] Reference numerals in the drawing:

[0014] 1 is an inner conductor, 2 is an inner conductor surface adhesive layer, 3 is an insulating inner layer, 4 is an insulating foaming layer, 5 is an insulating outer surface adhesive layer, 6 is a shielding layer, 7 is a water blocking layer, and 8 is a sheath layer. DETAILED DESCRIPTION

[0015] The salt spray resistant high water resistance bending resistant seamless aluminum extrusion pipe coaxial cable shown in the drawing comprises an inner conductor 1 and an insulating inner layer 3, an insulating foaming layer 4, a shielding layer 6 and a sheath layer 8 coated on the outer surface of the inner conductor from inside to outside. This is similar to the existing seamless aluminum pipe coaxial cable.

[0016] The improvement of the utility model is:

[0017] First, the inner conductor surface adhesive layer 2 is coated on the outer surface of the inner conductor layer, the insulating outer surface adhesive layer 5 is coated on the outer surface of the insulating foaming layer, and the water blocking layer 7 is arranged between the shielding layer and the sheath layer;

[0018] Second, the inner conductor adopts high-strength copper-clad aluminum; the insulating inner layer adopts a salt mist resistant low density polyethylene material insulation layer formed by extrusion of the salt mist resistant low density polyethylene material; the insulating foaming layer is a physical foaming polyethylene material layer formed by physical foaming process of the polyethylene material; the inner conductor outer surface bonding layer and the insulating foaming layer outer surface bonding layer both adopt ethylene acrylic acid copolymer (EAA); the shielding layer is extruded from a seamless aluminum pipe; the water blocking layer is waterproof ointment coated on the outer surface of the aluminum pipe; and the sheath layer is an extruded polyethylene sheath layer with water blocking function.

[0019] The production process of the utility model is as follows:

[0020] 1. The insulating inner layer and the insulating foaming layer are extruded on the surface of the copper-clad aluminum inner conductor to obtain an insulating wire.

[0021] 2. Then a layer of aluminum pipe is coated on the surface of the insulating wire by a continuous seamless extruder to form a shielding layer.

[0022] 3. Then a layer of ointment water blocking layer is coated on the surface of the shielding layer by an ointment machine.

[0023] 4. Finally, the sheath is extruded to obtain a complete salt mist resistant high water blocking bending resistant seamless aluminum extruded pipe coaxial cable.

[0024] The utility model has the characteristics that the insulating inner layer material selects the salt mist resistant low density polyethylene, the insulating inner layer outer surface and the insulating foaming outer surface are coated with a bonding layer, the shielding layer and the sheath are uniformly coated with a layer of water blocking ointment, the sheath material selects the polyethylene with high water blocking characteristics, the double water blocking protection design makes the cable have good water blocking and corrosion resistance characteristics, can guarantee that the cable is even sprayed by rain and moisture erosion for a long time, and the copper-clad aluminum inner conductor and the aluminum pipe outer conductor will not be corroded, thereby guaranteeing the stability and reliability of the electric signal transmission; the inner conductor selects the high-strength hard copper-clad aluminum, and the outer conductor is extruded from the thick-walled seamless aluminum extruded pipe, so that the cable has excellent tensile characteristics under the characteristics of good electrical transmission characteristics and shielding.

[0025] The above is the detailed introduction of the utility model; for the general manufacturer in the field, according to the thought and principle of the embodiment of the utility model, the specific implementation mode and application range will be changed; therefore, the content of the specification should not be understood as the limitation of the utility model.

Claims

1. A high water-resistance, salt-mist-resistant, bend-resistant, seamless, coaxial cable made of aluminum, comprising an inner conductor (1) and, in order from the inside out, an insulating inner layer (3), an insulating foamed layer (4), a shielding layer (6) and a sheath layer (8) covering the outside of the inner conductor; characterized in that: The inner conductor outer surface is provided with an inner conductor surface bonding layer (2) between the insulating foaming layer and the shielding layer, and the shielding layer is provided with an insulating outer layer surface bonding layer (5) between the shielding layer and the sheath layer, and the shielding layer is provided with a water blocking layer (7) between the shielding layer and the sheath layer; the inner conductor is high-strength copper-clad aluminum, the insulating inner layer is a salt mist resistant low-density polyethylene material insulating layer, the insulating foaming layer is a physical foaming polyethylene material layer, the shielding layer is a seamless aluminum pipe, and the sheath layer is a vinyl chloride layer.

2. The anti-salt-fog, high water barrier, bend-insensitive, seamless, coaxial cable of claim 1, wherein: The inner conductor surface bonding layer and the insulating outer layer surface bonding layer are both formed by covering with ethylene acrylic acid copolymer.

3. The anti-salt-fog, high water barrier, bend-insensitive, seamless, coaxial cable of claim 2, wherein: The water blocking layer is formed by covering with waterproof ointment.

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