Anti-oxidation low-loss leaky coaxial cable

Abstract

The utility model discloses an anti-oxidation low-loss leaky coaxial cable, which comprises a copper pipe conductor, an EVA (Ethylene Vinyl Acetate) water-blocking inner bonding layer, a foamed polyethylene inner insulating layer, a ferrite film inner cushion layer, an EVA water-blocking middle bonding layer, a copper strip longitudinal wrapping shielding layer, a copper zinc alloy electroplated layer, an EVA water-blocking outer bonding layer and an irradiation crosslinking high-density polyethylene sheath layer, the thickness of the foamed polyethylene inner insulating layer is not less than 6mm, the outer surface of the copper strip longitudinally-wrapped shielding layer is electroplated to form a copper-zinc alloy electroplated layer, a plurality of rectangular leakage slotted holes are formed in the copper strip longitudinally-wrapped shielding layer in the axial direction, the length of each rectangular leakage slotted hole is not less than 30mm, and the width of each rectangular leakage slotted hole is 60%-90% of the perimeter of the copper strip longitudinally-wrapped shielding layer. And the distance between the rectangular leakage slotted holes is not less than 50mm. The cable effectively inhibits the oxidation of the outer conductor, prevents the deterioration, optimizes the slotting size and structure of the leakage slotted hole, reduces the loss attenuation, and effectively reduces the radiation interference.

Description

Technical Field

[0001] This application belongs to the technical field of cables, and particularly relates to an anti-oxidation and low-loss leaky coaxial cable. Background Art

[0002] A leaky coaxial cable, also known as a leaky coax cable, is usually simply referred to as a leaky cable or a leakage cable. A leaky coaxial cable has two functions of a transmission line and an antenna. While transmitting signals, it can also radiate signals to the outside world through periodically distributed slots. Due to its performance and significant role, leaky coaxial cables are widely used in environments with poor wireless signal coverage such as railways, tunnels, mines, and buildings. It has both the transmission characteristics of a transmission line and the radiation characteristics of an antenna, and can overcome the problem of strong electromagnetic interference underground, thereby improving the communication quality. Currently, a leaky coaxial cable usually consists of an inner conductor, a foamed insulation layer, an outer conductor, a tape, and a sheath. The insulation layer is made of high-foamed polyethylene resin material, which can greatly reduce the attenuation value of the cable. With the development of wireless communication technology and the improvement of communication levels, people's requirements for communication signals are also getting higher and higher. In large buildings such as high-rise buildings and large mansions, as well as areas with good shielding such as ships and steelmaking processes, wireless signals cannot cover every corner. Such complex environments all require wireless signal coverage. The radio frequency energy in the leaky coaxial cable can be coupled or radiated to the external environment through periodic or non-periodic slotting or a braided cover. Different slotting methods result in a larger loss attenuation. Only when the slot length is selected appropriately can the radio wave radiation direction reach the best, thereby effectively reducing radiation interference. Utility Model Content

[0003] Aiming at the deficiencies of the prior art, the technical problem to be solved by this application is to provide an anti-oxidation and low-loss leaky coaxial cable, which can effectively inhibit the oxidation of the outer conductor, prevent deterioration, optimize the slotting size structure of the leaky slots, reduce the loss attenuation, and effectively reduce radiation interference.

[0004] The above technical problems are solved by the following technical solutions in this application.

[0005] An anti-oxidation and low-loss leaky coaxial cable includes a copper tube conductor and an EVA water-blocking inner bonding layer, a foamed polyethylene inner insulation layer, a ferrite film inner cushion layer, an EVA water-blocking intermediate bonding layer, a copper tape longitudinally wrapped shielding layer, a copper-zinc alloy electroplating layer, an EVA water-blocking outer bonding layer, and an irradiated cross-linked high-density polyethylene sheath layer sequentially coated on the outside of the copper tube conductor. The thickness of the foamed polyethylene inner insulation layer is not less than 6 mm. The copper-zinc alloy electroplating layer is electroplated on the outer surface of the copper tape longitudinally wrapped shielding layer. A plurality of rectangular leaky slots are axially opened on the copper tape longitudinally wrapped shielding layer. The length of the rectangular leaky slots is not less than 30 mm. The width of the rectangular leaky slots is 60% to 90% of the circumference of the copper tape longitudinally wrapped shielding layer. The distance between the rectangular leaky slots is not less than 50 mm.

[0006] Preferably, the copper tube conductor is a spiral corrugated copper tube.

[0007] Preferably, the longitudinally wrapped copper tape shielding layer is formed by longitudinally wrapping a corrugated copper tape.

[0008] Preferably, the foamed polyethylene inner insulating layer is a foamed polyethylene resin layer with a foaming ratio of 70% to 85%.

[0009] Preferably, the thicknesses of the EVA water-blocking inner adhesive layer, the EVA water-blocking intermediate adhesive layer, and the EVA water-blocking outer adhesive layer are all 3 μm to 15 μm.

[0010] Preferably, the thickness of the ferrite thin film inner cushion layer is 0.05 mm to 0.2 mm.

[0011] Preferably, the thickness of the copper-zinc alloy plating layer is not more than 2 μm.

[0012] Preferably, the thickness of the foamed polyethylene inner insulating layer is not more than 7.5 mm.

[0013] Preferably, the distance between the rectangular leakage slots is not more than 200 mm.

[0014] Preferably, the thickness of the irradiated cross-linked high-density polyethylene sheath layer is 1 mm to 3 mm.

[0015] Advantages of the present application:

[0016] 1. By adopting a rectangular leakage slot grooving structure, optimizing the grooving size and the proportional relationship with the circumference of the longitudinally wrapped copper tape shielding layer, the length of the rectangular leakage slot is not less than 30 mm, the width is 60% to 90% of the circumference of the longitudinally wrapped copper tape shielding layer, and the distance between the rectangular leakage slots is not less than 50 mm, so that the transmitted energy is large, the loss attenuation is reduced, and the radiation interference is effectively reduced.

[0017] 2. A copper-zinc alloy plating layer is electroplated on the outer surface of the existing longitudinally wrapped copper tape shielding layer to inhibit the oxidation of the copper tape, eliminate deterioration such as discoloration caused by oxidation, and help improve the communication quality.

[0018] 3. The conductor uses a corrugated copper tube with high conductivity to improve the bending resistance and has high mechanical strength, which helps to extend the service life of the cable. The insulation uses a foamed polyethylene resin with a low dielectric constant and a foaming ratio of 70% to 85%, and the equivalent dielectric constant reaches 1.2. When used at high frequencies, it helps to reduce the transmission attenuation. By adding EVA water-blocking inner, intermediate, and outer adhesive layers, the performance of blocking the diffusion of water vapor is enhanced, the moisture-proof and water-blocking characteristics of the cable are improved, the electrical insulation characteristics of the cable are protected, the service life of the cable is extended, and it can be used more durably. Description of the Drawings

[0019] Figure 1 Schematic cross-sectional structure diagram of the embodiment of the present application.

[0020] Description of reference numerals:

[0021] 1 - Copper tube conductor, 2 - EVA water-blocking inner bonding layer, 3 - Foamed polyethylene inner insulation layer, 4 - Ferrite film inner cushion layer, 5 - EVA water-blocking intermediate bonding layer, 6 - Copper tape longitudinally wrapped shielding layer, 7 - Copper-zinc alloy electroplating layer, 8 - EVA water-blocking outer bonding layer, 9 - Radiation-crosslinked high-density polyethylene sheath layer. Specific embodiments

[0022] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the scope of protection of the present application.

[0023] See Figure 1 , the anti-oxidation low-loss leaky coaxial cable of the embodiment of the present application includes a copper tube conductor 1, and the copper tube conductor 1 is a spiral corrugated copper tube. The outside of the copper tube conductor 1 is sequentially coated with an EVA water-blocking inner bonding layer 2, a foamed polyethylene inner insulation layer 3, a ferrite film inner cushion layer 4, an EVA water-blocking intermediate bonding layer 5, a copper tape longitudinally wrapped shielding layer 6, a copper-zinc alloy electroplating layer 7, an EVA water-blocking outer bonding layer 8, and a radiation-crosslinked high-density polyethylene sheath layer 9.

[0024] The foamed polyethylene inner insulation layer 3 is a foamed polyethylene resin layer with a foaming rate of 70% to 85%. The thickness of the foamed polyethylene inner insulation layer 3 is not less than 6 mm and not more than 7.5 mm. The thickness of the ferrite film inner cushion layer 4 is 0.05 mm to 0.2 mm. The copper tape longitudinally wrapped shielding layer 6 is formed by longitudinally wrapping a corrugated copper tape. The copper-zinc alloy electroplating layer 7 is electroplated on the outer surface of the copper tape longitudinally wrapped shielding layer 6. Further, the thickness of the copper-zinc alloy electroplating layer 7 is not more than 2 μm. A plurality of rectangular leakage slot holes are axially opened on the copper tape longitudinally wrapped shielding layer 6. The length of the rectangular leakage slot holes is not less than 30 mm, the width of the rectangular leakage slot holes is 60% to 90% of the circumference of the copper tape longitudinally wrapped shielding layer 6, and the spacing between the rectangular leakage slot holes is not less than 50 mm and not more than 200 mm. The thicknesses of the EVA water-blocking inner bonding layer 2, the EVA water-blocking intermediate bonding layer 5, and the EVA water-blocking outer bonding layer 8 are all 3 μm to 15 μm. The thickness of the radiation-crosslinked high-density polyethylene sheath layer 9 is 1 mm to 3 mm.

[0025] Obviously, those skilled in the art can make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalent technologies, this application is also intended to include these modifications and variations.

Claims

1. Anti-oxidation low-loss leaky coaxial cable, characterized in that: It includes a copper tube conductor (1), and an EVA water-blocking inner bonding layer (2), a foamed polyethylene inner insulation layer (3), a ferrite film inner cushion layer (4), an EVA water-blocking middle bonding layer (5), a copper tape longitudinally wrapped shielding layer (6), a copper-zinc alloy electroplating layer (7), an EVA water-blocking outer bonding layer (8), and an irradiated cross-linked high-density polyethylene sheath layer (9) that are successively coated on the outside of the copper tube conductor (1). The thickness of the foamed polyethylene inner insulation layer (3) is not less than 6 mm. The copper-zinc alloy electroplating layer (7) is formed by electroplating on the outer surface of the copper tape longitudinally wrapped shielding layer (6). A number of rectangular leakage slot holes are axially opened on the copper tape longitudinally wrapped shielding layer (6). The length of the rectangular leakage slot holes is not less than 30 mm. The width of the rectangular leakage slot holes is 60% to 90% of the circumference of the copper tape longitudinally wrapped shielding layer (6). The distance between the rectangular leakage slot holes is not less than 50 mm.

2. The anti-oxidation and low-loss leaky coaxial cable according to claim 1, characterized in that: The copper tube conductor (1) is a spiral corrugated copper tube.

3. The anti-oxidation low-loss leaky coaxial cable according to claim 1, characterized in that: The copper tape longitudinally wrapped shielding layer (6) is formed by longitudinally wrapping a corrugated copper tape.

4. The anti-oxidation low-loss leaky coaxial cable according to claim 1, characterized in that: The foamed polyethylene inner insulation layer (3) is a foamed polyethylene resin layer with a foaming rate of 70% to 85%.

5. The anti-oxidation low-loss leaky coaxial cable according to claim 1, characterized in that: The thicknesses of the EVA water-blocking inner bonding layer (2), the EVA water-blocking middle bonding layer (5), and the EVA water-blocking outer bonding layer (8) are all 3 μm to 15 μm.

6. The anti-oxidation low-loss leaky coaxial cable according to claim 1, characterized in that: The thickness of the ferrite film inner cushion layer (4) is 0.05 mm to 0.2 mm.

7. The anti-oxidation low-loss leaky coaxial cable according to claim 1, characterized in that: The thickness of the copper-zinc alloy electroplating layer (7) is not greater than 2 μm.

8. The anti-oxidation and low-loss leaky coaxial cable according to claim 1, wherein: The thickness of the foamed polyethylene inner insulation layer (3) is not greater than 7.5 mm.

9. The anti-oxidation and low-loss leaky coaxial cable according to claim 1, characterized in that: The distance between the rectangular leakage slot holes is not greater than 200 mm.

10. The anti-oxidation low-loss leaky coaxial cable according to claim 1, characterized in that: The thickness of the irradiated cross-linked high-density polyethylene sheath layer (9) is 1 mm to 3 mm.

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