Vibration-resistant tensile aluminum alloy variable frequency cable

Abstract

The utility model discloses a vibration-resistant tensile aluminum alloy variable frequency cable, which comprises three phase line cores and three neutral line cores which surround a silicone rubber core tube and are twisted with six cross-linked fluororubber elastomers to form a cable core, and each phase line core comprises a phase line conductor, a tensile Kevlar woven mesh and a PFA (Polyfluoroalkoxy) insulating layer. The neutral wire core comprises a neutral wire conductor and a nylon coating layer, and the cable core is sequentially coated with a PTFE wrapping antifriction layer, an aluminum alloy belt interlocking shielding layer, a ferrite film wrapping layer and a PVC outer sheath layer. The variable frequency cable is high in overall mechanical strength and better in tensile property, the cable core structure is optimized, the shock resistance is effectively improved, loads borne by the wire cores are reduced, stable electrical characteristics are guaranteed, and the variable frequency cable is durable in use.

Description

Technical Field

[0001] The present application relates to the field of cable technology, and in particular to a vibration-resistant and tensile-resistant aluminum alloy frequency conversion cable. Background Art

[0002] Frequency conversion motors are widely used in China, in metallurgy, mining, railways and other industries, as well as in household appliances. Frequency conversion control systems are applied to frequency conversion cables. As the power transmission carrier of motors and frequency conversion controllers, due to the working characteristics of large transmission power and short transmission frequency change time, they need to be able to withstand the pulse voltage during frequency conversion and have good electromagnetic shielding performance to effectively eliminate electromagnetic interference to ensure the stable operation of the frequency conversion control system. Frequency conversion cables have different technical performance requirements from ordinary cables. The mechanical strength, impact resistance, vibration resistance and tensile resistance of ordinary cables cannot fully meet the requirements of the frequency conversion control system for the use characteristics of frequency conversion cables, and cannot effectively ensure the safe operation of the frequency conversion control system and related equipment. Utility Model Content

[0003] In view of the deficiencies in the prior art, the technical problem to be solved by the present application is to provide a vibration-resistant and tensile-resistant aluminum alloy frequency conversion cable. The cable has high overall mechanical strength and better tensile resistance. The cable core structure is optimized to effectively improve the vibration resistance, reduce the load on each core, ensure stable electrical characteristics, and ensure durable use.

[0004] This application solves the above technical problems through the following technical solutions.

[0005] The vibration-resistant and tensile-resistant aluminum alloy frequency conversion cable comprises three phase line cores and three neutral line cores which are surrounded by a silicone rubber core tube and twisted together with six cross-linked fluororubber elastomers to form a cable core, wherein the phase line core comprises a phase line conductor, a tensile-resistant Kevlar braided mesh and a PFA insulation layer, wherein the phase line conductor is formed by concentrically twisting two layers of oxygen-free aluminum fan-shaped conductors around an aluminum alloy monofilament, the neutral line core comprises a neutral line conductor and a nylon coating layer, wherein the neutral line conductor is formed by concentrically twisting a single layer of oxygen-free aluminum fan-shaped conductor around an aluminum alloy monofilament, and the outside of the cable core is sequentially coated with a PTFE wrapped friction reduction layer, an aluminum alloy tape interlocking shielding layer, a ferrite film wrapped layer and a PVC outer sheath layer.

[0006] Preferably, the oxygen-free aluminum sector-shaped conductor is a stranded wire formed by twisting a plurality of strands and pressing them into a sector-shaped structure, wherein the strands are formed by twisting a plurality of oxygen-free aluminum wires with a wire diameter of 0.02 mm to 0.08 mm.

[0007] Preferably, the lay length of the strands is 15 to 40 times the outer diameter of the strands, and the lay length of the multiple twisted wires is 10 to 25 times the outer diameter of the multiple twisted wires.

[0008] Preferably, the lay direction of the strands is opposite to that of the multiple twisted wires.

[0009] Preferably, the cross-linked fluororubber elastomer comprises an inner cylindrical body and an outer cylindrical body, and a plurality of connecting plates are evenly distributed radially between the inner cylindrical body and the outer cylindrical body.

[0010] Preferably, the silicone rubber core tube is sheathed with galvanized steel stranded wire.

[0011] Preferably, the silicone rubber core tube is filled with insulating lubricating grease.

[0012] Preferably, the galvanized steel stranded wire is composed of a number of galvanized steel monofilaments with a wire diameter of 0.02 mm to 0.04 mm, which are concentrically twisted.

[0013] Preferably, the tensile-resistant Kevlar braided mesh is formed by a plurality of Kevlar threads being woven in counter-rotating spirals with a braiding density of not less than 95%.

[0014] Preferably, the PTFE wrapped anti-friction layer is a multi-layer overlapping wrapped structure of PTFE resin tapes, and the winding distance is 2 to 4 times the tape width.

[0015] Beneficial effects of this application:

[0016] 1. By surrounding the three phase line cores and three neutral line cores with the silicone rubber core tube and twisting them with six cross-linked fluororubber elastomers, the cable core structure is balanced and stable, with better seismic resistance and higher mechanical strength. The cross-linked fluororubber elastomer with a cylindrical structure has good physical and mechanical properties and high elasticity, which improves the impact resistance of the cable. In the case of slight impact, it has a better shock-absorbing effect, which helps to reduce the lateral pressure and extrusion force of each core when bending, effectively reduce the load on each core, ensure stable electrical characteristics, and better durability.

[0017] 2. The tensile resistance is improved by adding a silicone rubber core tube in the center of the cable core. The silicone rubber core tube is filled with insulating lubricating grease to increase the tensile margin of the galvanized steel strand and improve the tensile resistance. The oxygen-free aluminum fan-shaped conductor is used to concentrically twist around the outer aluminum alloy monofilament to form the phase conductor and the neutral conductor, which is conducive to balancing the extension of the cable and improving the mechanical strength and tensile resistance of the cable.

[0018] 3. Adding a tensile-resistant Kevlar braided mesh between the phase line conductor and the insulation layer with a braiding density of not less than 95% helps prevent the insulation layer from penetrating into the oxygen-free aluminum wires and causing adhesion, enhances the flexibility and tensile resistance of the phase line conductor, increases the axial extension margin of the phase line conductor, effectively protects the insulation layer, and extends its service life.

[0019] 4. The phase conductor and neutral conductor are formed by twisting oxygen-free aluminum wire around aluminum alloy monofilament. They are corrosion-resistant and can better adapt to various corrosive working conditions. They can replace the copper core conductor structure, reduce the weight of the cable, significantly reduce the material cost, and reduce the purchase cost.

[0020] 5. The double-layer shielding structure is formed by the interlocking shielding layer of aluminum alloy and the ferrite film sheathing layer. The shielding performance is more stable, which effectively eliminates electromagnetic interference and effectively ensures the stable operation of the frequency conversion control system. The ferrite film sheathing layer helps to reduce the torque force and the stress concentration of the interlocking shielding layer of the aluminum alloy, improves the flexibility of the cable and makes it more durable. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the cross-sectional structure of an embodiment of the present application.

[0022] Description of reference numerals:

[0023] 1-phase line core, 2-neutral line core, 3-silicone rubber core tube, 4-cross-linked fluororubber elastomer, 5-phase line conductor, 6-tensile Kevlar braided mesh, 7-PFA insulation layer, 8-neutral line conductor, 9-nylon coating, 10-PTFE wrapped anti-friction layer, 11-aluminum alloy tape interlocking shielding layer, 12-ferrite film wrapped layer, 13-PVC outer sheath layer, 14-galvanized steel stranded wire. DETAILED DESCRIPTION

[0024] The terms used in the implementation method part of this application are only used to explain the specific embodiments of this application, and are not intended to limit this application. The implementation method of the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0025] See also Figure 1 The vibration-resistant and tensile-resistant aluminum alloy frequency conversion cable of the embodiment of the present application includes three phase wire cores 1 and three neutral wire cores 2 surrounding a silicone rubber core tube 3 and twisted together with six cross-linked fluororubber elastomers 4 to form a cable core. Furthermore, the silicone rubber core tube 3 is sheathed with a galvanized steel strand 14, which is composed of a number of galvanized steel monofilaments with a wire diameter of 0.02mm to 0.04mm concentrically twisted, and the silicone rubber core tube 3 is filled with insulating lubricating grease. In one embodiment, the cross-linked fluororubber elastomer 4 includes an inner cylinder and an outer cylinder, and a number of connecting plates are evenly distributed radially between the inner cylinder and the outer cylinder.

[0026] The phase line core 1 includes a phase line conductor 5, a tensile-resistant Kevlar braided mesh 6 and a PFA insulation layer 7. The phase line conductor 5 is formed by concentrically twisting two layers of oxygen-free aluminum fan-shaped conductors around an aluminum alloy monofilament. In one embodiment, the tensile-resistant Kevlar braided mesh 6 is formed by a plurality of Kevlar wires being mutually reversely spirally wound and woven, and the braiding density is not less than 95%. The neutral line core 2 includes a neutral line conductor 8 and a nylon coating layer 9. The neutral line conductor 8 is formed by concentrically twisting a single layer of oxygen-free aluminum fan-shaped conductor around an aluminum alloy monofilament. Specifically, the oxygen-free aluminum fan-shaped conductor is a plurality of strands twisted together to form a stranded wire and pressed into a fan-shaped structure. The strands are formed by twisting a plurality of oxygen-free aluminum wires with a wire diameter of 0.02 mm to 0.08 mm. Furthermore, the lay length of the strands is 15 to 40 times the outer diameter of the strands, and the lay length of the stranded wire is 10 to 25 times the outer diameter of the stranded wire. The lay direction of the strands is opposite to that of the stranded wire.

[0027] The cable core is coated with a PTFE wrapped anti-friction layer 10, an aluminum alloy tape interlocking shielding layer 11, a ferrite film wrapped layer 12 and a PVC outer sheath layer 13. In one embodiment, the PTFE wrapped anti-friction layer 10 is a PTFE resin tape multi-layer overlapping wrapped structure and the winding distance is 2 to 4 times the bandwidth.

[0028] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that any technician familiar with this technical field can still modify the technical solutions recorded in the aforementioned embodiments within the technical scope disclosed in the present application, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be covered by the protection scope of the present application.

Claims

1. Vibration-resistant and tensile-resistant aluminum alloy frequency conversion cable, characterized by: The invention comprises three phase line cores (1) and three neutral line cores (2) surrounding a silicone rubber core tube (3) and twisted together with six cross-linked fluororubber elastomers (4) to form a cable core. The phase line core (1) comprises a phase line conductor (5), a tensile-resistant Kevlar braided mesh (6) and a PFA insulation layer (7). The phase line conductor (5) is formed by concentrically twisting two layers of oxygen-free aluminum fan-shaped conductors around an aluminum alloy monofilament. The neutral line core (2) comprises a neutral line conductor (8) and a nylon coating layer (9). The neutral line conductor (8) is formed by concentrically twisting a single layer of oxygen-free aluminum fan-shaped conductor around an aluminum alloy monofilament. The outside of the cable core is sequentially coated with a PTFE wrapped friction reduction layer (10), an aluminum alloy tape interlocking shielding layer (11), a ferrite film wrapped layer (12) and a PVC outer sheath layer (13).

2. The vibration-resistant and tensile-resistant aluminum alloy frequency conversion cable according to claim 1 is characterized in that: The oxygen-free aluminum sector conductor is a stranded wire formed by twisting a plurality of strands and pressing them into a sector structure. The strands are formed by twisting a plurality of oxygen-free aluminum wires with a diameter of 0.02 mm to 0.08 mm.

3. The vibration-resistant and tensile-resistant aluminum alloy frequency conversion cable according to claim 2 is characterized in that: The lay length of the strands is 15 to 40 times the outer diameter of the strands, and the lay length of the multiple twisted wires is 10 to 25 times the outer diameter of the multiple twisted wires.

4. The vibration-resistant and tensile-resistant aluminum alloy frequency conversion cable according to claim 2 is characterized in that: The lay direction of the strands is opposite to that of the multiple twisted wires.

5. The vibration-resistant and tensile-resistant aluminum alloy frequency conversion cable according to claim 1 is characterized in that: The cross-linked fluororubber elastic body (4) comprises an inner cylindrical body and an outer cylindrical body, and a plurality of connecting plates are evenly distributed in a radial pattern between the inner cylindrical body and the outer cylindrical body.

6. The vibration-resistant and tensile-resistant aluminum alloy frequency conversion cable according to claim 1 is characterized by: The silicone rubber core tube (3) is sheathed with a galvanized steel strand (14).

7. The vibration-resistant and tensile-resistant aluminum alloy frequency conversion cable according to claim 6 is characterized by: The silicone rubber core tube (3) is filled with insulating lubricating grease.

8. The vibration-resistant and tensile-resistant aluminum alloy frequency conversion cable according to claim 6 is characterized by: The galvanized steel strand (14) is composed of a plurality of galvanized steel monofilaments having a wire diameter of 0.02 mm to 0.04 mm, which are coaxially twisted.

9. The vibration-resistant and tensile-resistant aluminum alloy frequency conversion cable according to claim 1 is characterized by: The tensile-resistant Kevlar braided mesh (6) is formed by a plurality of Kevlar threads being mutually spirally wound and braided, and the braiding density is not less than 95%.

10. The vibration-resistant and tensile-resistant aluminum alloy frequency conversion cable according to claim 1 is characterized in that: The PTFE wrapped anti-friction layer (10) is a PTFE resin tape multi-layer overlapping wrapped structure, and the winding distance is 2 to 4 times the tape width.

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