Marine medium-voltage variable-frequency driving flexible cable

Abstract

The utility model provides a marine medium-voltage variable-frequency driving flexible cable, which comprises a fiber core, a power transmission wire core and a cable jacket unit. Each power transmission wire core comprises a conductor, an inner insulating layer, a metal shielding layer, an electrical isolation layer and a corrosion-resistant layer, so that the conductivity, the insulativity, the shielding property and the corrosion resistance of the cable are improved. The cable jacket unit comprises an outer insulating layer, a first metal shielding net, an extrusion-resistant layer, a second metal shielding net, a heat-resistant layer, a flame-retardant wrapping layer and a wear-resistant outer sheath. The first metal shielding net adopts a 4 / 4 twill weaving mode, and the second metal shielding net adopts a 3 / 3 twill weaving mode, so that the weaving density is higher, the anti-electromagnetic interference capability is improved, and the signal transmission stability is ensured. The extrusion-resistant layer and the heat-resistant layer improve the reliability of the cable in mechanical stress and high-temperature environments, the flame-retardant wrapping layer enhances the fireproof performance, and the wear-resistant outer sheath provides wear resistance and aging resistance. Therefore, the cable can meet the requirement of high electrical performance.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a medium-voltage variable-frequency drive soft cable for ships. Background Art

[0002] With the development of modern shipbuilding industry, the application of medium voltage variable frequency drive system in ship power system is becoming more and more extensive. The medium voltage variable frequency drive system can effectively adjust the motor speed, achieve energy saving and emission reduction and efficient operation, and has become an important part of the ship electrical system. However, with the application of frequency conversion technology, the role of cables in the system has become particularly important. Cables for medium voltage variable frequency drive systems in ships not only need to have excellent electrical performance, but also need to cope with the special working environment and stringent use requirements of ships.

[0003] The existing medium-voltage marine cables on the market are often affected by certain electromagnetic interference during use, resulting in instability in system operation. These electromagnetic interferences will not only affect the cable itself, but may also interfere with surrounding equipment and systems through conduction and radiation, and in severe cases may even cause the failure of the entire system. The existing cable structure still has certain deficiencies in shielding and anti-electromagnetic interference capabilities. Especially under medium voltage conditions, the traditional shielding layer design often cannot fully isolate external electromagnetic interference, resulting in the cable being difficult to maintain stable performance in a complex marine environment. Therefore, a new type of marine medium-voltage variable frequency drive soft cable is urgently needed to solve the above technical problems. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a medium-voltage variable-frequency drive flexible cable for ships, which solves the problems of insufficient electromagnetic interference protection of some cables in the prior art, poor mechanical strength and durability of the cables, and the like.

[0005] A medium-voltage variable-frequency drive soft cable for ship use, comprising a fiber core, a multi-phase power transmission core annularly arranged on the outside of the fiber core, and a cable jacket unit, wherein the power transmission core of each phase comprises, from the inside to the outside, a conductor, an inner insulation layer, a metal shielding layer, an electrical isolation layer, and a corrosion-resistant layer, and the cable jacket unit is coated on the outside of the power transmission core, and the cable jacket unit comprises, from the inside to the outside, an outer insulation layer, a first metal shielding mesh, an extrusion-resistant layer, a second metal shielding mesh, a heat-resistant layer, a flame-retardant winding layer, and a wear-resistant outer sheath, wherein the first metal shielding mesh adopts a 4 / 4 twill weave, and the second metal shielding mesh adopts a 3 / 3 twill weave.

[0006] Preferably, the first metal shielding mesh is a twill-woven metal shielding mesh of tinned copper wires, and the second metal shielding mesh is a twill-woven composite metal shielding mesh of aluminum wires and copper wires.

[0007] Preferably, the weaving density of the first metal shielding mesh is greater than or equal to 90%, and the weaving density of the second metal shielding mesh is greater than or equal to 85%.

[0008] Preferably, an anti-interference filling layer is filled between the power transmission line cores.

[0009] Preferably, the outer circumference of the fiber core is inwardly recessed to form a plurality of arcs, and a portion of the power transmission core is in contact with the power transmission core.

[0010] Preferably, the wear-resistant outer sheath comprises a wear-resistant layer and convex strips arranged on the outer side of the wear-resistant layer.

[0011] Preferably, the conductor is a copper conductor, and the copper conductor is made of oxygen-free copper.

[0012] Preferably, an anti-ultraviolet layer is provided between the flame-retardant wrapping layer and the wear-resistant outer sheath.

[0013] Preferably, the power transmission core contains 3 phases.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] The utility model provides a medium-voltage variable frequency drive soft cable for ship, which comprises a fiber core, a multi-phase power transmission core annularly arranged outside the fiber core, and a cable jacket unit. First, the tensile strength and flexibility of the cable are guaranteed by the arrangement of the fiber core. The power transmission core of each phase comprises a conductor, an inner insulating layer, a metal shielding layer, an electrical isolation layer, and a corrosion-resistant layer, thereby effectively improving the electrical conductivity, insulation, shielding, and corrosion resistance of the cable. The cable jacket unit is coated on the outer side of the power transmission core, and comprises an outer insulating layer, a first metal shielding mesh, an extrusion-resistant layer, a second metal shielding mesh, a heat-resistant layer, a flame-retardant winding layer, and a wear-resistant outer sheath, further enhancing the mechanical strength and durability of the cable. Among them, the first metal shielding mesh adopts a 4 / 4 twill weave, and the second metal shielding mesh adopts a 3 / 3 twill weave, with a higher weaving density, so that the cable performs better in terms of anti-electromagnetic interference. By adopting metal shielding meshes with different weaving methods, a more efficient shielding effect can be provided in different frequency ranges, reducing the external electromagnetic interference of the cable, and ensuring the stability and reliability of signal transmission. At the same time, the high-density braided structure of the metal shielding net also improves the mechanical strength and durability of the cable, which helps the cable maintain good performance and long life in harsh marine environments. The extrusion-resistant layer and heat-resistant layer improve the reliability of the cable under mechanical stress and high temperature environments, the flame-retardant wrapping layer enhances the fire resistance of the cable, and the wear-resistant outer sheath provides excellent wear resistance and aging resistance. Therefore, this marine medium-voltage variable-frequency drive soft cable not only meets the high electrical performance requirements of the medium-voltage variable-frequency drive system, but also has excellent environmental adaptability and long-term use stability, greatly improving the service life and safety of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the cross-sectional structure of the medium-voltage variable-frequency drive flexible cable for ships according to the utility model;

[0017] in:

[0018] 10-fiber core, 20-power transmission line core, 30-cable jacket unit, 40-anti-interference filling layer, 21-conductor, 22-inner insulation layer, 23-metal shielding layer, 24-electrical isolation layer, 25-corrosion-resistant layer, 31-outer insulation layer, 32-first metal shielding mesh, 33-extrusion-resistant layer, 34-second metal shielding mesh, 35-heat-resistant layer, 36-flame-retardant winding layer, 37-wear-resistant outer sheath. DETAILED DESCRIPTION

[0019] The embodiments described below are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] See also Figure 1 The present embodiment provides a medium-voltage variable-frequency drive flexible cable for ship use, which comprises a fiber core 10, a multi-phase power transmission core 20 annularly arranged on the outside of the fiber core 10, and a cable jacket unit 30, wherein the power transmission core 20 of each phase comprises, from the inside to the outside, a conductor 21, an inner insulating layer 22, a metal shielding layer 23, an electrical isolation layer 24, and a corrosion-resistant layer 25, and the cable jacket unit 30 is coated on the outside of the power transmission core 20, and the cable jacket unit 30 comprises, from the inside to the outside, an outer insulating layer 31, a first metal shielding mesh 32, an extrusion-resistant layer 33, a second metal shielding mesh 34, a heat-resistant layer 35, a flame-retardant winding layer 36, and a wear-resistant outer sheath 37, wherein the first metal shielding mesh 32 adopts a 4 / 4 twill weave, and the second metal shielding mesh 34 adopts a 3 / 3 twill weave.

[0021] Preferably, the first metal shielding mesh 32 is a tinned copper wire twill woven metal shielding mesh, and the second metal shielding mesh is a composite metal shielding mesh of aluminum wire and copper wire twill weave. The shielding effect and anti-electromagnetic interference capability of the cable are significantly improved. The setting of tinned copper wire enhances the corrosion resistance of the shielding mesh, while improving the electrical performance and service life. The composite metal shielding mesh combines the advantages of aluminum wire and copper wire, which not only improves the mechanical strength and durability of the cable, but also provides a more efficient shielding effect in different frequency ranges. The two shielding meshes of different materials and weaving methods work together to ensure the signal transmission stability and reliability of the cable in a complex marine environment, greatly improving the overall performance of the cable.

[0022] Preferably, the braiding density of the first metal shielding mesh 32 is greater than or equal to 90%, and the braiding density of the second metal shielding mesh 34 is greater than or equal to 85%. The high braiding density of the first metal shielding mesh 32 ensures effective shielding of low-frequency interference, while the higher braiding density of the second metal shielding mesh 34 can provide effective shielding effect in a higher frequency range. The high-density braiding structure not only improves the anti-electromagnetic interference performance of the cable, but also enhances the mechanical strength and durability of the cable, so that it maintains good performance and long life in harsh marine environments, thereby ensuring the stability and reliability of signal transmission.

[0023] Preferably, an anti-interference filling layer 40 is filled between the power transmission cores 20. The anti-electromagnetic interference capability of the cable can be further enhanced. The anti-interference filling layer 40 can effectively isolate the electromagnetic interference between the cores of each phase, reduce the crosstalk phenomenon inside the cable, and improve the electromagnetic compatibility performance of the cable as a whole. At the same time, the anti-interference filling layer 40 can also increase the structural stability of the cable, prevent the core from being displaced or damaged due to mechanical vibration or external pressure during use, thereby improving the durability and reliability of the cable.

[0024] Preferably, the outer circumference of the fiber core 10 is inwardly concave with multiple arcs, and part of the power transmission core 20 fits with the power transmission core 20. In the present application, the fiber core 10 adopts a flexible fiber core 10, and by providing an inwardly concave arc structure on the outer circumference of the fiber core 10, the power transmission core 20 can fit more closely with the fiber core 10, thereby improving the overall stability and mechanical strength of the cable. The use of a flexible fiber core 10 not only ensures the softness and tensile strength of the cable, but also effectively alleviates deformation and damage caused by external mechanical stress, thereby extending the service life of the cable.

[0025] Preferably, the wear-resistant outer sheath 37 comprises a wear-resistant layer and convex strips arranged outside the wear-resistant layer, which effectively improves the wear resistance of the cable and the anti-slip performance of the cable.

[0026] Preferably, an anti-ultraviolet layer is provided between the flame-retardant wrapping layer 36 and the wear-resistant outer sheath 37. This enhances the weather resistance and long-term use performance of the cable. The anti-ultraviolet layer can effectively block the erosion and irradiation of ultraviolet rays, reduce the risk of material aging and color fading, and thus extend the service life of the cable in outdoor exposure environments.

[0027] Preferably, the power transmission core 20 includes three phases. The conductor 21 is a copper conductor 21, and the copper conductor 21 is made of oxygen-free copper.

[0028] It should be noted that in the present application, the inner insulating layer 22 is composed of a wrapped mica tape and ceramic silicone rubber extruded outside the mica tape, the metal shielding layer 23 is an aluminum foil metal shielding layer 23, the electrical isolation layer 24 is a PE electrical isolation layer 24 formed by extruding polyethylene outside the metal shielding layer 23, and the corrosion-resistant layer 25 is a chlorosulfonated polyethylene rubber layer or a polyester material layer.

[0029] It should also be noted that the outer insulating layer 31 is composed of a cross-linked polyolefin molecular structure formed by extrusion melting and ultraviolet light irradiation to form a three-dimensional network, the extrusion-resistant layer 33 is a styrene-butadiene rubber extrusion-resistant layer 33, the heat-resistant layer 35 is an insulating glass wool heat-resistant layer 35, the flame-retardant wrapping layer 36 is a high-density foam cotton flame-retardant wrapping layer 36, and the wear-resistant outer sheath 37 is an environmentally friendly epoxy-based anti-corrosion and wear-resistant coating outer sheath.

[0030] The utility model provides a medium-voltage variable frequency drive soft cable for ship, which comprises a fiber core 10, a multi-phase power transmission core 20 annularly arranged outside the fiber core 10, and a cable jacket unit 30. First, the tensile strength and flexibility of the cable are guaranteed by the arrangement of the fiber core 10. The power transmission core 20 of each phase comprises a conductor 21, an inner insulating layer 22, a metal shielding layer 23, an electrical isolation layer 24, and a corrosion-resistant layer 25, thereby effectively improving the electrical conductivity, insulation, shielding and corrosion resistance of the cable. The cable jacket unit 30 is coated on the outside of the power transmission core 20, and comprises an outer insulating layer 31, a first metal shielding mesh 32, an extrusion-resistant layer 33, a second metal shielding mesh 34, a heat-resistant layer 35, a flame-retardant sheath 36, and a wear-resistant outer sheath 37, which further enhances the mechanical strength and durability of the cable. Among them, the first metal shielding net 32 ​​adopts a 4 / 4 twill weave, and the second metal shielding net 34 adopts a 3 / 3 twill weave, with a higher weaving density, so that the cable performs better in terms of anti-electromagnetic interference. By adopting metal shielding nets with different weaving methods, a more efficient shielding effect can be provided in different frequency ranges, reducing the external electromagnetic interference of the cable, and ensuring the stability and reliability of signal transmission. At the same time, the high-density weaving structure of the metal shielding net also improves the mechanical strength and durability of the cable, which helps the cable to maintain good performance and long life in harsh marine environments. The extrusion-resistant layer 33 and the heat-resistant layer 35 improve the reliability of the cable under mechanical stress and high temperature environments, the flame-retardant wrapping layer 36 enhances the fire resistance of the cable, and the wear-resistant outer sheath 37 provides excellent wear resistance and anti-aging capabilities. Therefore, the marine medium-voltage variable-frequency drive soft cable not only meets the high electrical performance requirements of the medium-voltage variable-frequency drive system, but also has excellent environmental adaptability and long-term use stability, greatly improving the service life and safety of the cable.

[0031] The above disclosures are only several preferred embodiments of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention are still within the scope covered by the present invention.

Claims

1. A medium voltage variable frequency drive flexible cable for ship, characterized in that: It comprises a fiber core, a multi-phase power transmission core annularly arranged on the outside of the fiber core, and a cable jacket unit, wherein the power transmission core of each phase comprises a conductor, an inner insulation layer, a metal shielding layer, an electrical isolation layer and a corrosion-resistant layer from the inside to the outside, and the cable jacket unit is coated on the outside of the power transmission core, and the cable jacket unit comprises an outer insulation layer, a first metal shielding mesh, an extrusion-resistant layer, a second metal shielding mesh, a heat-resistant layer, a flame-retardant winding layer and a wear-resistant outer sheath arranged from the inside to the outside, wherein the first metal shielding mesh adopts a 4 / 4 twill weave, and the second metal shielding mesh adopts a 3 / 3 twill weave.

2. The medium voltage variable frequency drive flexible cable for ship use according to claim 1, characterized in that: The first metal shielding mesh is a twill-woven metal shielding mesh of tinned copper wires, and the second metal shielding mesh is a composite metal shielding mesh of twill-woven aluminum wires and copper wires.

3. The medium voltage variable frequency drive flexible cable for ship use according to claim 1, characterized in that: The weaving density of the first metal shielding mesh is greater than or equal to 90%, and the weaving density of the second metal shielding mesh is greater than or equal to 85%.

4. The medium voltage variable frequency drive flexible cable for ship use according to claim 1, characterized in that: An anti-interference filling layer is filled between the power transmission line cores.

5. The medium voltage variable frequency drive flexible cable for ship use according to claim 1, characterized in that: The outer circumference of the fiber core is inwardly recessed to form a plurality of arcs, and a portion of the power transmission core is in contact with the power transmission core.

6. The medium voltage variable frequency drive flexible cable for ship use according to claim 1, characterized in that: The wear-resistant outer sheath comprises a wear-resistant layer and convex strips arranged on the outer side of the wear-resistant layer.

7. The medium voltage variable frequency drive flexible cable for ship use according to claim 1, characterized in that: The conductor is a copper conductor, and the copper conductor is made of oxygen-free copper.

8. The medium voltage variable frequency drive flexible cable for ship use according to claim 1, characterized in that: An anti-ultraviolet layer is provided between the flame-retardant wrapping layer and the wear-resistant outer sheath.

9. The medium voltage variable frequency drive flexible cable for ship use according to claim 1, characterized in that: The power transmission core includes 3 phases.

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