Lotus root core radio frequency coaxial cable
By using a lotus-shaped insulating medium and a multi-layer shielding structure in RF coaxial cables, combining difficult-drip PE material and air flow channel, the problems of insufficient temperature resistance and poor flame retardant performance of the insulating layer are solved, and high-level shielding is achieved Attenuation and flame retardant effects.
Patent Information
- Application Number
- CN202420821574.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-19
- Publication Date
- 2024-12-06
- Estimated Expiration
- 2034-04-19
AI Technical Summary
The insulation layer of existing RF coaxial cables is insufficient in temperature resistance, resulting in loss of insulation in high temperature environments, inability to effectively shield signal interference and lack flame retardant performance.
The insulation medium with a lotus-like structure and three-layer alternating multi-layer shielding structure, including a metal wire braided layer and a longitudinally wrapped aluminum foil layer, combined with a difficult-drip PE material and an air flow channel, improve the elasticity and flame retardant performance of the cable.
It achieves lower transfer impedance and high-level shielding attenuation, reaching ClassA+ level, and at the same time improves the flame retardant performance of the cable, avoiding insulation failure and flame ignition of the cable in high temperature environments.
Smart Images
Figure CN222126106U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of radio frequency cables, and particularly relates to a lotus-core radio frequency coaxial cable. Background Art
[0002] In the prior art, RF coaxial cable, as a medium for electromagnetic wave transmission, is commonly used in CATV (cable TV) CCTV (closed-circuit television) video surveillance systems and audio and video signal transmission of various antennas. In order to avoid interference in signal transmission, coaxial RF cable must improve its shielding performance. Shielding attenuation and transfer impedance are the main parameters for measuring cable shielding performance. With the intensification of electromagnetic pollution, people have put forward higher requirements on the electromagnetic shielding performance of RF coaxial cable. The conductors of existing RF coaxial cables mostly use single copper wire or copper-clad aluminum wire, and the insulation layer uses foamed polyethylene to reduce attenuation. The disadvantage is that the temperature resistance of the foamed polyethylene insulation layer is only 75°C. When the cable temperature exceeds its operating temperature, the cable insulation layer loses its insulation significance. Utility Model Content
[0003] The utility model aims to provide a lotus-core radio frequency coaxial cable, which achieves shielding attenuation and transfer impedance by arranging an insulating medium with a lotus-shaped structure and a three-layer shielding structure, while improving the flame retardant performance of the cable.
[0004] The purpose of the utility model is achieved as follows: a lotus-core radio frequency coaxial cable, comprising a coaxially arranged inner conductor, an outer conductor and an outer sheath, an insulating medium with a lotus-shaped structure is arranged between the inner conductor and the outer conductor, the outer conductor comprises at least one metal wire braided layer, a longitudinally wrapped aluminum foil layer one and a longitudinally wrapped aluminum foil layer two, the longitudinally wrapped aluminum foil layer one is located outside the insulating medium, and the thickness of the longitudinally wrapped aluminum foil layer one and the longitudinally wrapped aluminum foil layer two is not less than 16μm.
[0005] Compared with the prior art, the beneficial effects of the utility model are: the insulating medium of the lotus-shaped structure not only isolates the inner and outer conductors to prevent short circuits, but also provides just the right elastic support for the cable like an air spring to avoid bending damage; a shielding structure of at least three layers of alternating multi-layers is adopted to obtain a smaller braided shielding layer resistance value, thereby achieving a lower transfer impedance. According to experimental tests, the shielding attenuation level of the cable can reach Class A+; by setting the longitudinally wrapped aluminum foil layer one and the longitudinally wrapped aluminum foil layer two, the flame can be better blocked from burning through and igniting the insulating medium; when burning, the aluminum foil layer one will merge with the insulating medium to form a strong flame retardant effect.
[0006] As a further improvement of the present invention, the metal wire braided layer is a tinned copper wire braided layer.
[0007] As a further improvement of the present invention, the number of the metal wire braided layers is 2, namely metal wire braided layer one and metal wire braided layer two, and the longitudinally wrapped aluminum foil layer two is arranged between the metal wire braided layer one and the metal wire braided layer two.
[0008] As a further improvement of the present invention, the first metal wire braided layer is a magnesium alloy wire braided layer, and the second metal wire braided layer is an aluminum-magnesium alloy wire braided layer.
[0009] As a further improvement of the present invention, the first longitudinally wrapped aluminum foil layer and the second longitudinally wrapped aluminum foil layer are both double-sided aluminum foils.
[0010] As a further improvement of the utility model, the insulating medium is made of a difficult-to-drip PE material with a melt flow index of 0.2-0.5 g / 10 min.
[0011] As a further improvement of the utility model, the insulating medium includes a plurality of air flow channels extending along its length direction, and the plurality of air flow channels are distributed at equal intervals along the outer circumference of the inner conductor. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 This is a schematic structural diagram of the first embodiment of the present utility model.
[0013] Figure 2 This is a schematic diagram of the structure of the second embodiment of the present utility model.
[0014] Among them, 1 is an inner conductor, 2 is an outer conductor, 201 is a first longitudinal aluminum foil layer, 202 is a second longitudinal aluminum foil layer, 203 is a tinned copper wire braided layer, 204 is a magnesium alloy wire braided layer, 205 is an aluminum-magnesium alloy wire braided layer, 3 is an outer sheath, 4 is an insulating medium, and 401 is an air flow channel. DETAILED DESCRIPTION Embodiment 1
[0015] like Figure 1 As shown, a lotus-core radio frequency coaxial cable comprises an inner conductor 1, an outer conductor 2 and an outer sheath 3 arranged coaxially, an insulating medium 4 with a lotus-shaped structure is arranged between the inner conductor 1 and the outer conductor 2, the insulating medium 4 comprises five air flow channels 401 extending along its length direction, the five air flow channels 401 are evenly spaced along the outer circumference of the inner conductor 1, and the insulating medium 4 is preferably made of a difficult-to-drip PE material with a melt flow index of 0.2g / 10min; the outer conductor 2 comprises a metal wire braided layer 1, a longitudinally wrapped aluminum foil layer 1 201 and a longitudinally wrapped aluminum foil layer 202, the longitudinally wrapped aluminum foil layer 1 201 is located on the outside of the insulating medium 4, and the thickness of the longitudinally wrapped aluminum foil layer 1 201 and the longitudinally wrapped aluminum foil layer 202 are both 20μm; preferably, the metal wire braided layer is a tinned copper wire braided layer 203, and the longitudinally wrapped aluminum foil layer 1 201 and the longitudinally wrapped aluminum foil layer 202 are both double-sided aluminum foil. Embodiment 2
[0016] like Figure 2 As shown, it is another kind of lotus-core RF coaxial cable, including a coaxially arranged inner conductor 1, an outer conductor 2 and an outer sheath 3, an insulating medium 4 with a lotus-shaped structure is arranged between the inner conductor 1 and the outer conductor 2, the insulating medium 4 includes eight air flow channels 401 extending along its length direction, and the eight air flow channels 401 are evenly spaced along the outer periphery of the inner conductor 1, and the insulating medium 4 is preferably made of a difficult-to-drip PE material with a melt flow index of 0.5g / 10min; the outer conductor 2 includes a metal wire braided layer 1, a metal wire braided layer 2, a longitudinally wrapped aluminum foil layer 1 201 and a longitudinally wrapped aluminum foil layer 2 202, the longitudinally wrapped aluminum foil layer 1 201 is located on the outside of the insulating medium 4, and the longitudinally wrapped aluminum foil layer 202 is arranged between the metal wire braided layer 1 and the metal wire braided layer 2; the thickness of the longitudinally wrapped aluminum foil layer 1 201 and the longitudinally wrapped aluminum foil layer 2 202 are both 16μm; preferably, the metal wire braided layer 1 is a magnesium alloy wire braided layer 204, and the metal wire braided layer 2 is an aluminum-magnesium alloy wire braided layer 205.
[0017] The advantages of the utility model are: the use of difficult-to-drip PE material as the insulating medium 4 can further improve the flame retardant effect of the cable; the cable can select metal wire braiding layers of different materials or change the number of braided shielding layers according to different shielding attenuation and transfer impedance requirements, thereby achieving the purpose of high cost performance.
[0018] The present utility model is not limited to the above-mentioned embodiments. On the basis of the technical solution disclosed in the present utility model, technicians in this field can make some substitutions and deformations to some technical features therein according to the disclosed technical content without creative labor, and these substitutions and deformations are all within the protection scope of the present utility model.
Claims
1. A core radio frequency coaxial cable, comprising a coaxially arranged inner conductor, an outer conductor and an outer sheath, characterized in that: An insulating medium with a lotus root-shaped structure is arranged between the inner conductor and the outer conductor. The outer conductor includes at least one metal wire braided layer, a longitudinally wrapped aluminum foil layer one and a longitudinally wrapped aluminum foil layer two. The longitudinally wrapped aluminum foil layer one is located outside the insulating medium. The thickness of the longitudinally wrapped aluminum foil layer one and the longitudinally wrapped aluminum foil layer two is not less than 16 μm.
2. The lotus core radio frequency coaxial cable according to claim 1, characterized in that: The metal wire braided layer is a tinned copper wire braided layer.
3. The lotus core radio frequency coaxial cable according to claim 1, characterized in that: The number of the metal wire braided layers is 2, namely metal wire braided layer 1 and metal wire braided layer 2, and the longitudinally wrapped aluminum foil layer 2 is arranged between the metal wire braided layer 1 and the metal wire braided layer 2.
4. The lotus core radio frequency coaxial cable according to claim 3, characterized in that: The first metal wire braided layer is a magnesium alloy wire braided layer, and the second metal wire braided layer is an aluminum-magnesium alloy wire braided layer.
5. The lotus core radio frequency coaxial cable according to claim 1, characterized in that: The first longitudinal aluminum foil layer and the second longitudinal aluminum foil layer are both double-sided aluminum foils.
6. The lotus core radio frequency coaxial cable according to claim 1, characterized in that: The insulating medium is made of a difficult-to-drip PE material with a melt flow index of 0.2-0.5 g / 10 min.
7. A lotus core radio frequency coaxial cable according to any one of claims 1 to 6, characterized in that: The insulating medium comprises a plurality of air flow channels extending along its length direction, and the plurality of air flow channels are distributed at equal intervals along the outer circumference of the inner conductor.