Light noise-resistant instrument shielding cable with copper-clad aluminum wire cores

Abstract

The utility model discloses a light noise-resistant instrument shielding cable with copper-clad aluminum wire cores, which comprises six single-pair shielding twisted wire cores, wherein the six single-pair shielding twisted wire cores are uniformly distributed around the outside of a central galvanized steel wire stranded wire at intervals in the circumferential direction and are twisted together with a polyester staple fiber buffer core material to form a cable core; a polyester fiber plain woven fabric longitudinal wrapping layer, an aluminum-plastic composite belt wrapping total shielding layer, an irradiation crosslinking linear low-density polyethylene lining layer, a copper net weaving armor layer and an irradiation crosslinking linear low-density polyethylene outer sheath layer are sequentially wrapped outside the cable core. The cable is based on a copper-clad aluminum wire core structure, light-weight preparation is facilitated, the bending resistance is better, cracking and wire breakage of the shielding layer can be inhibited, and the noise resistance is better.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a lightweight and noise-resistant copper-clad aluminum wire core instrument shielded cable. Background Art

[0002] In intelligent industrial production lines, symmetric communication cables are used for the connection of electronic computers, detection instruments, and meters with relatively high anti-interference performance requirements at rated voltages of 300 / 500V and below. The electromagnetic noise environment at industrial application sites is often very complex, and the radiation or conduction (EMI) of electromagnetic noise may seriously interfere with the normal operation of equipment. To combat electromagnetic noise interference on electrical lines, a very important way is to use symmetric communication cables with shielding. However, in general, the twisted pair cores adopt a non-unwinding double-core winding method and an external reverse-wrapped binding tape or shielding layer. The two cores of the twisted pair core are prone to loosening, the anti-signal interference ability is greatly weakened, the noise resistance is poor, which greatly affects the electrical characteristics of the cable. Moreover, in a relatively complex installation environment, the aluminum foil, copper foil sub-total shielding layer and copper wire braided shielding layer are extremely prone to cracking, breaking, etc., the noise resistance is poor, resulting in unstable electrical characteristics, and even affecting the normal use of the cable and not being durable for application. Summary of the Utility Model

[0003] Aiming at the deficiencies of the prior art, the technical problem to be solved by the utility model is to provide a lightweight and noise-resistant copper-clad aluminum wire core instrument shielded cable. Based on the copper-clad aluminum wire core structure, it is beneficial for lightweight preparation, the conductor has better flexibility, the cable core structure is round and balanced, the anti-bending performance is better, which helps to inhibit the cracking and breaking of the shielding layer, has better noise resistance, and is durable for application.

[0004] The above technical problem of the utility model is solved by the following technical solutions.

[0005] The lightweight and noise-resistant copper-clad aluminum wire core instrument shielded cable includes six single-pair shielded twisted pair cores evenly distributed circumferentially around the central galvanized steel wire strand and jointly twisted with a polyester staple fiber buffer core material to form a cable core. The single-pair shielded twisted pair core includes two insulated wire cores that are unwound and twisted and are evenly distributed in a cross shape with two polyester staple fiber filling core strips to form a wire core body. The insulated wire core includes a fine aluminum stranded inner conductor layer, and a number of thick copper stranded outer conductor layers are twisted around the outside of the fine aluminum stranded inner conductor layer. An XLPE insulation layer is coated on the outside of the thick copper stranded outer conductor layer. An aluminum-plastic composite wrapped sub-shielding layer is coated on the outside of the wire core body. The cable core is sequentially coated with a polyester fiber plain woven fabric longitudinal wrapping layer, an aluminum-plastic composite tape wrapped total shielding layer, an irradiated cross-linked linear low-density polyethylene inner lining layer, a copper mesh braided armor layer, and an irradiated cross-linked linear low-density polyethylene outer sheath layer.

[0006] Preferably, the fine aluminum stranded wire inner conductor layer is composed of a number of aluminum alloy single wires with a wire diameter of 0.02 mm to 0.04 mm concentrically stranded, and the thick copper stranded wire is composed of a number of copper alloy single wires with a wire diameter of 0.05 mm to 0.12 mm concentrically stranded.

[0007] Preferably, the fine aluminum stranded wire inner conductor layer and the thick copper stranded wire outer conductor layer are stranded in the same direction, and the lay length of the thick copper stranded wire outer conductor layer is greater than that of the fine aluminum stranded wire inner conductor layer.

[0008] Preferably, both the aluminum-plastic composite wrapped partial shielding layer and the aluminum-plastic composite tape wrapped overall shielding layer are spiral overlapping wrapped structures of aluminum-plastic composite tape with an overlapping rate of not less than 25%, and the aluminum-plastic composite tape includes a PET film and an aluminum foil layer.

[0009] Preferably, the lay lengths of the six single-pair shielded twisted wire cores are 10 mm to 20 mm and are different from each other.

[0010] Preferably, the polyester fiber plain woven fabric longitudinal wrapping layer is a three-layer polyester fiber plain woven fabric butt-seamed longitudinal wrapping structure, and the three longitudinal slits formed are 120 degrees circumferentially from each other.

[0011] Preferably, the twisting direction of the insulated wire core, the twisting direction of the cable core, the winding direction of the aluminum-plastic composite wrapped partial shielding layer, and the winding direction of the aluminum-plastic composite tape wrapped overall shielding layer are all the same.

[0012] Preferably, the thickness of the polyester fiber plain woven fabric longitudinal wrapping layer is 100 μm to 350 μm.

[0013] Preferably, the thickness of the irradiated cross-linked linear low-density polyethylene inner liner layer is 0.45 mm to 1 mm.

[0014] Preferably, the thickness of the irradiated cross-linked linear low-density polyethylene outer sheath layer is 0.8 mm to 1.6 mm.

[0015] Advantages of the present utility model:

[0016] 1. The insulated wire core adopts a copper-clad aluminum wire conductor structure composed of a fine aluminum stranded wire inner conductor layer and a thick copper stranded wire outer conductor layer. Using aluminum alloy to partially replace the copper alloy conductor greatly reduces the preparation cost and realizes the preparation of lightweight cables. The thick copper stranded wire outer conductor layer is tightly wrapped around the outside of the fine aluminum stranded wire inner conductor layer. The conductor structure is compact, the inner conductor layer has better flexibility, the outer conductor layer has better rigidity and bending resistance, higher structural strength, inhibits wire breakage, ensures good electrical characteristics of the conductor, extends the service life, and has better durability.

[0017] 2. The central tensile core material of the cable core uses a central galvanized steel strand, which can effectively improve the tensile performance and bending resistance of the cable when it is bent, slow down the extrusion force on the polyester staple fiber buffer core material, and add two polyester staple fiber filling core strips to the single-pair shielded twisted pair core to absorb energy and improve the bending resistance. This helps to inhibit the structural deformation of the single-pair shielded twisted pair core, is beneficial to reducing the occurrence of broken wires and cracks in the conductor and the shielding layer, ensuring stable electrical characteristics, and improving the durability and application performance.

[0018] 3. The lay direction of the insulated core, the lay direction of the cable core, the lay direction of the aluminum-plastic composite wrapped partial shielding layer, and the lay direction of the aluminum-plastic composite tape wrapped total shielding layer are all the same, which helps to ensure a balanced and stable cable core structure. The two insulated cores of the single-pair shielded twisted pair core adopt untwisted stranding, which is beneficial to inhibiting the loosening of each pair of twisted pair cores, reducing the interference between the two insulated cores, enhancing the ability to resist external electromagnetic wave interference, improving the noise resistance, and having better durability.

[0019] 4. By adding a copper mesh braided armor layer between the irradiated cross-linked linear low-density polyethylene inner liner layer and the outer sheath layer, it provides additional mechanical protection, has a certain resistance to slight impact, forms protection for the sheath layer, increases safety and reliability. At the same time, it forms a double-layer total shielding layer structure with the aluminum-plastic composite tape wrapped total shielding layer, ensuring stable shielding performance, improving noise resistance, enhancing the installation adaptability in complex environments, and having better durability and application performance.

[0020] 5. Using a three-layer polyester fiber plain woven fabric butt-seamed longitudinal wrapping structure to replace the lapped wrapping structure, there is no need to invest in winding equipment in the production process, reducing the equipment investment funds and the production cost. The three-layer polyester fiber plain woven fabric butt-seamed longitudinal wrapping structure forms three longitudinal gaps that are 120 degrees circumferentially from each other, making the wrapping tension tight without wrinkling, and the cable core has better followability. The aluminum-plastic composite tape wrapped total shielding layer maintains follow-up contact with the polyester fiber plain woven fabric longitudinal wrapping layer with appropriate and unchanged tension. The lapped part of the shielding layer is not prone to lapping misalignment, offset, or even aluminum foil cracking problems, improving the noise resistance, ensuring the stability of the shielding performance, and having better durability. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a cross-sectional structure schematic diagram of the specific implementation manner of this application.

[0022] In the figure: 1 - single-pair shielded twisted-pair wire core, 2 - central galvanized steel stranded wire, 3 - polyester staple fiber buffer core material, 4 - insulated wire core, 5 - polyester staple fiber filling core strip, 6 - fine aluminum stranded wire inner conductor layer, 7 - thick copper stranded wire outer conductor layer, 8 - XLPE insulation layer, 9 - aluminum-plastic composite wrapped partial shield layer, 10 - longitudinally wrapped polyester fiber plain woven fabric layer, 11 - aluminum-plastic composite tape wrapped overall shield layer, 12 - irradiated cross-linked linear low-density polyethylene inner liner layer, 13 - copper mesh braided armor layer, 14 - irradiated cross-linked linear low-density polyethylene outer sheath layer. Specific embodiments

[0023] The technical solution of the present utility model will be further described below in conjunction with the accompanying drawings and through specific embodiments.

[0024] As Figure 1 shown, the lightweight noise-resistant copper-clad aluminum wire core instrument shielded cable of the embodiment of the present utility model includes six single-pair shielded twisted-pair wire cores 1 evenly distributed at intervals circumferentially around the outside of the central galvanized steel stranded wire 2 and jointly stranded with the polyester staple fiber buffer core material 3 to form a cable core. Further, the lay lengths of the six single-pair shielded twisted-pair wire cores 1 are from 10 mm to 20 mm and are different from each other. The single-pair shielded twisted-pair wire core 1 includes two insulated wire cores 4 untwisted and stranded and evenly distributed in a cross shape with two polyester staple fiber filling core strips 5 to form a wire core body. The insulated wire core 4 includes a fine aluminum stranded wire inner conductor layer 6, and a number of thick copper stranded wires are stranded around the outside of the fine aluminum stranded wire inner conductor layer 6 to form a thick copper stranded wire outer conductor layer 7. Further, the fine aluminum stranded wire inner conductor layer 6 and the thick copper stranded wire outer conductor layer 7 are stranded in the same direction, and the lay length of the thick copper stranded wire outer conductor layer 7 is greater than that of the fine aluminum stranded wire inner conductor layer 6. Specifically, the fine aluminum stranded wire inner conductor layer 6 is formed by concentrically stranding a number of aluminum alloy single wires with a wire diameter of 0.02 mm to 0.04 mm, and the thick copper stranded wire is formed by concentrically stranding a number of copper alloy single wires with a wire diameter of 0.05 mm to 0.12 mm. The outside of the thick copper stranded wire outer conductor layer 7 is coated with an XLPE insulation layer 8. The outside of the wire core body is coated with an aluminum-plastic composite wrapped partial shield layer 9.

[0025] Outside the cable core, there are successively covered with a longitudinally wrapped layer 10 of polyester fiber plain woven fabric, a wrapped overall shielding layer 11 of aluminum-plastic composite tape, an inner lining layer 12 of irradiated cross-linked linear low-density polyethylene, an armored layer 13 of copper mesh braiding, and an outer sheath layer 14 of irradiated cross-linked linear low-density polyethylene. In one embodiment, both the aluminum-plastic composite wrapped partial shielding layer 9 and the aluminum-plastic composite tape wrapped overall shielding layer 11 are in a structure of spiral overlapping wrapping with an overlapping rate of not less than 25%, and the aluminum-plastic composite tape includes a PET film and an aluminum foil layer. In one embodiment, the longitudinally wrapped layer 10 of polyester fiber plain woven fabric is in a structure of longitudinally wrapping three layers of polyester fiber plain woven fabric in a butt-jointed manner, and the three longitudinal slits formed are 120 degrees circumferentially from each other. The thickness of the longitudinally wrapped layer 10 of polyester fiber plain woven fabric is from 100 μm to 350 μm. The thickness of the inner lining layer 12 of irradiated cross-linked linear low-density polyethylene is from 0.45 mm to 1 mm. The thickness of the outer sheath layer 14 of irradiated cross-linked linear low-density polyethylene is from 0.8 mm to 1.6 mm. Further, the twisting directions of the insulated wire cores, the cable core, the aluminum-plastic composite wrapped partial shielding layer 9, and the aluminum-plastic composite tape wrapped overall shielding layer 11 are all the same.

[0026] The present utility model is described through embodiments. It is known to those skilled in the art that various changes or equivalent replacements can be made to these features and embodiments without departing from the spirit and scope of the present utility model. Additionally, under the guidance of the present utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the protection scope of the present utility model.

Claims

1. Lightweight and noise-resistant copper-clad aluminum wire core instrument shielded cable, characterized in that: It includes six single-pair shielded twisted-pair cores (1) evenly distributed at circumferential intervals around a central galvanized steel strand (2) and jointly twisted with a polyester staple fiber buffer core material (3) to form a cable core. The single-pair shielded twisted-pair core (1) includes two insulated cores (4) untwisted and twisted and evenly distributed in a cross shape with two polyester staple fiber filling core strips (5) to form a core body. The insulated core (4) includes a fine aluminum stranded inner conductor layer (6), and a number of thick copper strands are twisted around the outside of the fine aluminum stranded inner conductor layer (6) to form a thick copper stranded outer conductor layer (7). An XLPE insulation layer (8) is coated on the outside of the thick copper stranded outer conductor layer (7). An aluminum-plastic composite wrapped partial shield layer (9) is coated on the outside of the core body. The outside of the cable core is successively coated with a polyester fiber plain woven fabric longitudinal wrapping layer (10), an aluminum-plastic composite tape wrapped overall shield layer (11), an irradiated cross-linked linear low-density polyethylene inner liner layer (12), a copper mesh braided armor layer (13), and an irradiated cross-linked linear low-density polyethylene outer sheath layer (14).

2. The lightweight noise-resistant copper-clad aluminum wire core instrument shielded cable according to claim 1, characterized in that: The fine aluminum stranded inner conductor layer (6) is composed of a number of aluminum alloy single wires with a wire diameter of 0.02 mm to 0.04 mm concentrically twisted, and the thick copper strand is composed of a number of copper alloy single wires with a wire diameter of 0.05 mm to 0.12 mm concentrically twisted.

3. The lightweight noise-resistant copper-clad aluminum wire core instrument shielded cable according to claim 1, characterized in that: The twisting directions of the fine aluminum stranded inner conductor layer (6) and the thick copper stranded outer conductor layer (7) are the same, and the lay length of the thick copper stranded outer conductor layer (7) is greater than that of the fine aluminum stranded inner conductor layer (6).

4. The lightweight noise-resistant copper-clad aluminum wire core instrument shielded cable according to claim 1, characterized in that: Both the aluminum-plastic composite wrapped partial shield layer (9) and the aluminum-plastic composite tape wrapped overall shield layer (11) are in a spiral overlapping wrapped structure with an aluminum-plastic composite tape and the overlapping rate is not less than 25%. The aluminum-plastic composite tape includes a PET film and an aluminum foil layer.

5. The lightweight noise-resistant copper-clad aluminum wire core instrument shielded cable according to claim 1, characterized in that: The lay lengths of the six single-pair shielded twisted-pair cores (1) are 10 mm to 20 mm and are different from each other.

6. The lightweight noise-resistant copper-clad aluminum wire core instrument shielded cable according to claim 1, characterized in that: The polyester fiber plain woven fabric longitudinal wrapping layer (10) is in a three-layer polyester fiber plain woven fabric butt-seamed longitudinal wrapping structure, and the three longitudinal gaps formed are 120 degrees circumferentially from each other.

7. The lightweight noise-resistant copper-clad aluminum wire core instrument shielded cable according to claim 1, characterized in that: The twisting directions of the insulated core, the twisting direction of the cable core, the winding direction of the aluminum-plastic composite wrapped partial shield layer (9), and the winding direction of the aluminum-plastic composite tape wrapped overall shield layer (11) are all the same.

8. The lightweight noise-resistant copper-clad aluminum wire core instrument shielded cable according to claim 1, characterized in that: The thickness of the polyester fiber plain woven fabric longitudinal wrapping layer (10) is 100 μm to 350 μm.

9. The lightweight noise-resistant copper-clad aluminum wire core instrument shielded cable according to claim 1, characterized in that: The thickness of the irradiated cross-linked linear low-density polyethylene inner liner layer (12) is 0.45 mm to 1 mm.

10. The lightweight noise-resistant copper-clad aluminum wire core instrument shielded cable according to claim 1, characterized in that: The thickness of the irradiated cross-linked linear low-density polyethylene outer sheath layer (14) is 0.8 mm to 1.6 mm.

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