Circulation-torsion-resistant coaxial line

Abstract

The utility model relates to the technical field of wires, in particular to a cyclic torsion resistant coaxial line, which is characterized in that the periphery of a conductor is coated with an insulating layer, a shielding layer, a braid layer and an outer coating layer from inside to outside, the shielding layer comprises at least two aluminum foil layers and at least two PET layers, and the aluminum foil layers and the PET layers are alternately stacked. When the aluminum foil layer and the PET layer are damaged due to friction between the insulating layer and the braid layer, at least one aluminum foil layer in the middle still plays a shielding role, so that signal leakage is blocked, impedance return loss meets the specification requirement that attenuation change is smaller than or equal to 20% after torsion, the braid layer is formed by weaving tinned copper, a tin layer is arranged on the periphery of a copper wire, higher strength is achieved, and the tensile strength is improved. Copper wires are prevented from being broken due to mutual friction in twisting motion, the shielding performance of the coaxial cable can be kept unchanged, the coaxial cable is not easy to break in drag chain and twisting motion, and the reliability and durability of the coaxial cable are improved.

Description

Technical Field

[0001] The present application relates to the technical field of wire materials, and particularly relates to a coaxial cable resistant to cyclic torsion. Background Art

[0002] In recent years, with the rapid development of in-vehicle coaxial cables, the application of coaxial products is no longer limited to static wiring scenarios, but is increasingly used in dynamic scenarios. However, conventional coaxial cables have problems such as open circuits, rubber skin cracking, and unqualified impedance return loss after torsion during operation in dynamic scenarios. Higher requirements are put forward for the reliability and durability of coaxial cables in dynamic scenario applications. Therefore, it is necessary to design a coaxial cable that meets the above performances simultaneously. Utility Model Content

[0003] In order to solve the above technical problems, the present application provides a coaxial cable resistant to cyclic torsion, which includes a conductor, an insulating layer, a shielding layer, a braided layer, and an outer jacket layer that are coated on the conductor from the inside out. The shielding layer includes at least two aluminum foil layers and at least two PET layers, and the aluminum foil layers and PET layers are alternately stacked. The braided layer is made of tinned copper braiding.

[0004] Preferably, the braided layer includes a bottom layer and a top layer. The bottom layer is braided by several groups of single tinned copper in a first direction, and the top layer is braided by several groups of six tinned copper in a second direction above the bottom layer.

[0005] Preferably, the conductor is a copper-clad steel conductor with a conductivity of 40-45%.

[0006] Preferably, the insulating layer is a solid PP layer.

[0007] Preferably, the outermost layer of the shielding layer is a PET layer.

[0008] Preferably, the outer jacket layer is a thermoplastic elastomer.

[0009] As can be seen from the above, the following beneficial effects can be obtained by applying the present application: By coating an insulating layer, a shielding layer, a braided layer, and an outer jacket layer on the outer periphery of the conductor from the inside out, and the shielding layer includes at least two aluminum foil layers and at least two PET layers, and the aluminum foil layers and PET layers are alternately stacked. During the drag chain movement and torsion process, when the aluminum foil layers and PET layers are damaged by friction between the insulating layer and the braided layer, there is still at least one aluminum foil layer in the middle that plays a shielding role, thereby blocking signal leakage and achieving the specification requirement that the impedance return loss after torsion conforms to an attenuation change ≤ 20%. The braided layer is made of tinned copper braiding, and the outer periphery of the copper wire is a tin layer, which has higher strength and prevents the copper wires from rubbing against each other during the torsion movement and causing the copper wires to break, and can maintain its shielding performance unchanged, and is not easy to break during the drag chain and torsion movement, improving the reliability and durability of the coaxial cable. Description of the Drawings

[0010] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments of the present application or the prior art. Obviously, the accompanying drawings in the following description are only a part of the embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0011] Figure 1 Schematic diagram of the coaxial cable resistant to cyclic torsion for the embodiment of the present application;

[0012] Figure 2 Structural diagram of the braided layer of the coaxial cable resistant to cyclic torsion for the embodiment of the present application;

[0013] Figure 3 Schematic diagram of the braiding of the coaxial cable resistant to cyclic torsion for the embodiment of the present application. Detailed implementation manners

[0014] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0015] Embodiment

[0016] To solve the above technical problems, this embodiment provides a coaxial cable resistant to cyclic torsion. As Figure 1-2 shown, it includes a conductor 10, an insulating layer 20, a shielding layer 30, a braided layer 40, and an outer sheath layer 50 that are coated on the conductor 10 from the inside out. The shielding layer 30 includes at least two aluminum foil layers 31 and at least two PET layers 32. The aluminum foil layers 31 and the PET layers 32 are alternately stacked. During the drag chain movement and torsion process, when the aluminum foil layers 31 and the PET layers 32 are damaged by friction between the insulating layer 20 and the braided layer 40, at least one aluminum foil layer 31 still plays a shielding role in the middle, thereby blocking signal leakage and achieving the specification requirement that the impedance return loss after torsion conforms to the attenuation change ≤ 20%. The braided layer 40 is made of tinned copper braiding, and the outer periphery of the copper wire is a tin layer, which has higher strength, prevents the copper wires from rubbing against each other and causing copper wire breakage during the torsion movement, can keep its shielding performance unchanged, is not easy to break during the drag chain and torsion movement, and improves the reliability and durability of the coaxial cable.

[0017] Specifically, as Figure 3As shown, the braided layer 40 includes a bottom layer 41 and a top layer 42. The bottom layer 41 is braided by 8 groups of single tinned copper wires along the first direction, and the top layer 42 is braided by 8 groups of 6 tinned copper wires along the second direction above the bottom layer 41. Exemplarily, the first direction and the second direction intersect, the first direction is to the right, and the second direction is to the left. The braided structure of the top layer is supported by the tinned copper of the bottom layer, which can match conventional connectors. The bottom layer is braided by 8 groups of single tinned copper wires, which can effectively save costs.

[0018] Furthermore, the braided layer of the existing wire is made of copper wires, and the copper wires will rub against each other during the torsional movement, causing the copper wires to break. Therefore, in this solution, tinned copper alloy is used, which has higher strength and can maintain its shielding performance unchanged. The outer layer is a tin layer, and the internal copper wires are not easily broken during the drag chain movement. The torsional test is as follows: the torsional length is 40 mm, 30 times / min, tested 5000 times at -20°C, tested 5000 times at 85°C, and tested 50000 times at 25°C, lasting for two cycles. After torsion, the copper breakage rate ≤ 20%.

[0019] Furthermore, in this embodiment, the shielding layer 30 includes at least two aluminum foil layers 31 and at least two PET layers 32. The aluminum foil layers 31 and the PET layers 32 are alternately stacked. The outermost layer of the shielding layer 30 is a PET layer 32. The two PET layers protect the middle aluminum foil layer 31 from wear, thereby ensuring that the signal does not leak. After torsion, the impedance return loss meets the specification requirements of attenuation change ≤ 20%.

[0020] Furthermore, the conductor 10 uses a copper-clad steel conductor, and its conductivity is 40-45%. Due to the skin effect, the signal increases with the frequency and will be concentrated on the surface of the conductor. Copper-clad steel has higher strength and hardness on the premise of ensuring the signal transmission ability.

[0021] Furthermore, the insulating layer 20 is a solid PP layer. The solid PP layer also has higher toughness and strength compared to PE, and can better maintain the original ability of the wire during the drag chain movement. It can pass the long-term aging test of 105°C X 3000 hrs and also has a lower change rate during the high and low temperature endurance movement.

[0022] The outer sheath of the existing wire usually uses PVC material. Affected by the friction of the internal conductor, ordinary PVC is prone to cracking after the endurance movement. In this embodiment, the outer sheath layer 50 is a thermoplastic elastomer. After torsion, the outer sheath layer 50 does not crack and can withstand a voltage of 1 kV for 60 s without breakdown.

[0023] In summary, in the solution of the present application, an insulating layer, a shielding layer, a braided layer, and an outer sheath are coated around the conductor from the inside to the outside. The shielding layer includes at least two aluminum foil layers and at least two PET layers, and the aluminum foil layers and the PET layers are alternately stacked. During the movement and torsion of the drag chain, when the aluminum foil layers and the PET layers are damaged by friction between the insulating layer and the braided layer, there is still at least one aluminum foil layer in the middle that plays a shielding role, thereby blocking signal leakage and achieving the specification requirements that the impedance return loss after torsion conforms to the attenuation change ≤ 20%. The braided layer is made of tinned copper braiding, and the outer periphery of the copper wire is a tin layer, which has higher strength and prevents the copper wires from rubbing against each other during the torsion movement and causing the copper wires to break, and can maintain its shielding performance unchanged, and is not easy to break during the drag chain and torsion movement, improving the reliability and durability of the coaxial cable.

[0024] The above-described embodiments do not limit the protection scope of the technical solution. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the above embodiments shall be included in the protection scope of the technical solution.

Claims

1. A cyclic torsion resistant coaxial line, characterized in that: The invention comprises a conductor (10), an insulating layer (20) covering the conductor (10) from the inside to the outside, a shielding layer (30), a braided layer (40) and an outer layer (50), wherein the shielding layer (30) comprises at least two aluminum foil layers (31) and at least two PET layers (32), wherein the aluminum foil layers (31) and the PET layers (32) are alternately stacked, and the braided layer (40) is braided with tinned copper.

2. The cyclic torsion resistant coaxial line according to claim 1, characterized in that: The braided layer (40) comprises a bottom layer (41) and a top layer (42), wherein the bottom layer (41) is formed by braiding a plurality of groups of single tinned copper strands along a first direction, and the top layer (42) is formed by braiding a plurality of groups of six tinned copper strands along a second direction above the bottom layer (41).

3. The cyclic torsion resistant coaxial line according to claim 1, characterized in that: The conductor (10) is a copper-clad steel conductor with a conductivity of 40-45%.

4. The cyclic torsion resistant coaxial line according to claim 1, characterized in that: The insulating layer (20) is a solid PP layer.

5. The cyclic torsion resistant coaxial line according to claim 1, characterized in that: The outermost layer of the shielding layer (30) is a PET layer (32).

6. The cyclic torsion resistant coaxial line according to claim 1, characterized in that: The outer layer (50) is a thermoplastic elastomer.

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