Aluminum tube type coaxial cable

Abstract

The utility model discloses an aluminum tube type coaxial cable, which belongs to the technical field of coaxial cables and comprises a first conductor, a dielectric layer, an aluminum tube and a sheath layer which are arranged from inside to outside, a first silver coating is arranged on the inner wall of the aluminum tube, and the first conductor comprises a copper wire and a second silver coating wrapped outside the copper wire. According to the utility model, the inner wall of the aluminum tube is provided with the first silver-plated layer, the first silver-plated layer improves the conductivity of the aluminum tube as the outer conductor, the first conductor comprises the second silver-plated layer, the second silver-plated layer improves the conductivity of the first conductor as the inner conductor, and the signal quality of the coaxial cable is ensured; the first silver plating layer is plated on the inner wall of the aluminum tube, is not in direct contact with air, does not react with sulfides in the air to cause blackening to affect signal transmission, and does not directly affect the first silver plating layer even if the sheath layer is damaged; and the dielectric layer is made of foamed polytetrafluoroethylene, has good insulating property, acid and alkali corrosion resistance, cold resistance and high temperature resistance.

Description

Technical Field

[0001] The utility model belongs to the technical field of coaxial cables, and particularly relates to an aluminum tube type coaxial cable. Background Technique

[0002] A coaxial cable is a commonly used cable for transmitting signals, generally composed of an inner conductor, an insulating layer, an outer conductor, and an outer sheath. Due to the advantages of high bandwidth and good shielding effect of coaxial cables, they are widely used in fields such as high-speed data transmission and video transmission. The outer conductor not only serves as part of the transmission loop but also has a shielding function to prevent interference from external electromagnetic waves and electromagnetic noise to the signal. The outer conductor is usually composed of copper wire braiding or an aluminum tube. The coaxial cable with an aluminum tube as the outer conductor has excellent high-frequency performance, lower attenuation, more uniform impedance, good shielding performance, and the advantages of moisture resistance and high mechanical strength. However, the electrical conductivity of the aluminum tube is not as good as that of the copper wire braiding layer. Content of the Utility Model

[0003] The technical problem solved by the utility model is to provide an aluminum tube type coaxial cable that improves the electrical conductivity of the outer conductor on the basis of ensuring the mechanical strength and shielding performance of the coaxial cable.

[0004] Technical Solution: To solve the above technical problem, the technical solution adopted by the utility model is as follows:

[0005] An aluminum tube type coaxial cable includes a first conductor, a dielectric layer, an aluminum tube, and a sheath layer arranged from the inside to the outside. The inner wall of the aluminum tube is provided with a first silver plating layer, and the first conductor includes a copper wire and a second silver plating layer coated outside the copper wire.

[0006] Further, the copper wire is formed by stranding two or more copper wires.

[0007] Further, the wall thickness of the aluminum tube is 0.1mm - 0.4mm.

[0008] Further, the thickness of the first silver plating layer is 1μm - 2μm.

[0009] Further, the thickness of the second silver plating layer is greater than 1μm.

[0010] Further, an armor layer and an outer jacket layer wrapped outside the armor layer are also provided outside the sheath layer.

[0011] Further, the dielectric layer is a foamed polytetrafluoroethylene layer.

[0012] Beneficial Effects: Compared with the prior art, the utility model has the following advantages:

[0013] 1. By providing a first silver plating layer on the inner wall of the aluminum tube, the first silver plating layer improves the electrical conductivity of the aluminum tube serving as the outer conductor. The first conductor includes a second silver plating layer, and the second silver plating layer improves the electrical conductivity of the first conductor serving as the inner conductor, ensuring the signal quality of the coaxial cable.

[0014] 2. The first silver plating layer is plated on the inner wall of the aluminum tube and does not directly contact the air. It will not react with sulfides in the air to turn black and affect signal transmission. Even if the sheath layer is damaged, it will not directly affect the first silver plating layer.

[0015] 3. The dielectric layer is foamed polytetrafluoroethylene, which has good insulation performance, is resistant to acid and alkali corrosion, and is resistant to cold and high temperatures. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the coaxial cable in Embodiment 1;

[0017] Figure 2 is a schematic structural diagram of the first conductor in Embodiment 1;

[0018] Figure 3 is a schematic structural diagram of the coaxial cable in Embodiment 2;

[0019] Figure 4 is a schematic structural diagram of the first conductor in Embodiment 2;

[0020] Figure 5 is a schematic structural diagram of the coaxial cable in Embodiment 3; DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The following further clarifies the present invention in conjunction with specific embodiments. The embodiments are implemented on the premise of the technical solution of the present invention. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention.

[0022] Embodiment 1

[0023] As Figure 1 and Figure 2As shown in the figure, an aluminum tube type coaxial cable includes a first conductor 1, a dielectric layer 2, an aluminum tube 3, and a sheath layer 4 arranged from the inside to the outside. The first conductor 1 is arranged at the innermost part. The first conductor 1 includes a copper wire 11 and a second silver plating layer 12. The copper wire 11 is a cylindrical wire composed of a single strand of oxygen-free copper wire. The second silver plating layer 12 is plated on the copper wire 11 by an existing silver plating method. The thickness of the second silver plating layer 12 is 3μm. After silver plating, the first conductor 1 has a smaller resistance and higher conductivity than a pure copper wire, improving the antioxidant ability of the copper wire. The dielectric layer 2 is wrapped around the first conductor 1. The dielectric layer 2 uses foamed polytetrafluoroethylene. Using a foamed material can make the cable lightweight, enhance the heat insulation and anti-interference properties of the cable while ensuring the insulation performance, and also reduce costs. The signal transmission speed in the dielectric material decreases as its dielectric constant increases. The dielectric layer 2 using a foamed insulating material can obtain a high-speed signal transmission speed by reducing the dielectric constant. Polytetrafluoroethylene has acid and alkali resistance, resistance to various organic solvents, and the characteristics of being cold-resistant and high-temperature-resistant, and can be used for a long time at -180°C to 260°C, improving the corrosion resistance and stability of the coaxial cable in high and low temperature environments. The aluminum tube 3 is arranged outside the dielectric layer 2. The aluminum tube 3 is a cylindrical tube. The wall thickness of the aluminum tube 3 is 0.3mm. A first silver plating layer 5 is provided on the inner wall of the aluminum tube 3. The thickness of the first silver plating layer 5 is 1.5μm. The first silver plating layer 5 is plated on the inner wall of the aluminum tube 3, thereby improving the conductivity of the aluminum tube 3 and enhancing the shielding performance of the aluminum tube 3. Since the first silver plating layer 5 is plated on the inner wall of the aluminum tube 3, the first silver plating layer 5 does not directly contact the air, will not react with sulfides in the air to cause blackening and affect signal transmission, nor will it react with oxygen in the air. Even if there is damage to the outside of the cable, it is not easily damaged and scratched by the outside, and the silver plating layer is more stable in use. The sheath layer 4 is wrapped around the aluminum tube 3. The sheath layer 4 is made of polyvinyl chloride material (the material of the sheath layer 4 can be selected according to different usage scenarios, such as chlorinated polyethylene, polyurethane, ceramized silicone rubber, polyethylene and other materials), and is coated on the aluminum tube 3 after extrusion molding, capable of providing good physical and mechanical properties and waterproof performance.

[0024] Example 2

[0025] As Figure 3 and Figure 4As shown in the figure, an aluminum tube type coaxial cable includes a first conductor 1, a dielectric layer 2, an aluminum tube 3, and a sheath layer 4 arranged from the inside to the outside. The first conductor 1 is arranged at the innermost part. The first conductor 1 includes a copper wire 11 and a second silver plating layer 12. The copper wire 11 is a wire stranded by multiple oxygen-free copper wires. The second silver plating layer 12 is plated on the outer wall of the copper wire 11 by an existing silver plating method. The thickness of the second silver plating layer 12 is 3μm. After the outer wall of the copper wire 11 is silver-plated, the conductivity is improved, and the antioxidant ability of the copper wire 11 is improved. The dielectric layer 2 is wrapped outside the first conductor 1. The dielectric layer 2 uses foamed polytetrafluoroethylene, which improves the corrosion resistance and stability of the coaxial cable in high and low temperature environments. The aluminum tube 3 is arranged outside the dielectric layer 2. The aluminum tube 3 is a cylindrical tube. The wall thickness of the aluminum tube 3 is 0.3mm. A first silver plating layer 5 is provided on the inner wall of the aluminum tube 3. The thickness of the first silver plating layer 5 is 2μm. The sheath layer 4 is wrapped outside the aluminum tube 3. The sheath layer 4 is made of polyethylene material and is coated outside the aluminum tube 3 after extrusion molding, having good physical and mechanical properties and waterproof performance.

[0026] Embodiment 3

[0027] As Figure 5 shown in the figure, an aluminum tube type coaxial cable includes a first conductor 1, a dielectric layer 2, an aluminum tube 3, a sheath layer 4, an armor layer 7, and an outer jacket layer 8 arranged from the inside to the outside. The first conductor 1 is arranged at the innermost part. The first conductor 1 includes a copper wire 11 and a second silver plating layer 12. The copper wire 11 is a cylindrical wire composed of a single oxygen-free copper wire. The second silver plating layer 12 is plated on the outer wall of the copper wire by an existing silver plating method. The thickness of the second silver plating layer 12 is 5μm. After the outer wall of the copper wire 11 is silver-plated, the conductivity is improved, and the antioxidant ability of the copper wire 11 is improved. The dielectric layer 2 is wrapped outside the first conductor 1. The dielectric layer 2 uses foamed polytetrafluoroethylene, which improves the corrosion resistance and stability of the coaxial cable in high and low temperature environments. The aluminum tube 3 is arranged outside the dielectric layer 2. The aluminum tube 3 is a cylindrical tube. The wall thickness of the aluminum tube 3 is 0.3mm. A first silver plating layer 5 is provided on the inner wall of the aluminum tube 3. The thickness of the first silver plating layer 5 is 1.5μm. The sheath layer 4 is wrapped outside the aluminum tube 3. The sheath layer 4 is made of polyethylene material and is coated outside the aluminum tube 3 after extrusion molding, having good physical and mechanical properties and waterproof performance. An armor layer 7 and an outer jacket layer 8 are also provided outside the sheath layer 4. The armor layer 7 is woven by steel wires. The armor layer 7 can improve the mechanical strength and anti-erosion ability of the cable. The outer jacket layer 8 is wrapped outside the armor layer 7. The outer jacket layer 8 is made of high-density polyethylene material, which is pressure-resistant and corrosion-resistant. The cable provided with the armor layer 7 and the outer jacket layer 8 can be used in harsh environments, such as when the cable is buried in the soil or immersed in water.

[0028] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and retouches can be made, and these improvements and retouches should also be regarded as the protection scope of the present invention.

Claims

1. An aluminum tube coaxial cable, characterized in that: The invention comprises a first conductor (1), a dielectric layer (2), an aluminum tube (3) and a sheath layer (4) which are arranged from the inside to the outside, wherein the inner wall of the aluminum tube (3) is provided with a first silver-plated layer (5), and the first conductor (1) comprises a copper wire (11) and a second silver-plated layer (12) coated on the outside of the copper wire (11).

2. The aluminum tube type coaxial cable according to claim 1, characterized in that: The copper wire (11) is formed by twisting two or more copper wires.

3. The aluminum tube type coaxial cable according to claim 2, characterized in that: The wall thickness of the aluminum tube (3) is 0.1 mm-0.4 mm.

4. The aluminum tube type coaxial cable according to claim 1, characterized in that: The first silver-plated layer (5) has a thickness of 1 μm-2 μm.

5. The aluminum tube type coaxial cable according to claim 1, characterized in that: The second silver-plated layer (12) has a thickness greater than 1 μm.

6. The aluminum tube type coaxial cable according to claim 2, characterized in that: An armor layer (7) and an outer jacket layer (8) wrapped around the armor layer (7) are also provided outside the sheath layer (4).

7. The aluminum tube type coaxial cable according to claim 1, characterized in that: The medium layer (2) is a foamed polytetrafluoroethylene layer.

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