Integral high-torsion-resistance wind energy cable

Abstract

The utility model relates to an integral high-torsion-resistance wind energy cable, which is characterized in that a first layer of insulation and a second layer of insulation are extruded outside a conductor, three or four insulation wire cores are twisted around a central cushion core to form a cable core, an inner cushion layer is extruded, a steel wire bundle is wound, and an inner sheath and an outer sheath are extruded. According to the utility model, the insulating wire cores are arranged dispersedly and are not in contact with each other, two insulating layers are arranged, when the cable is stressed and twisted, the first insulating layer is not rubbed, a steel wire bundle stress structure is embedded in the inner sheath, each layer of the cable is in contact with a non-circular surface and is not separated from each other, and the overall torsion resistance is high.

Description

Technical Field

[0001] The utility model relates to a cable, in particular to a wind energy cable. Background Art

[0002] During the use of wind power cables, they twist with the wind force. The wind force is random, and the cable force has no obvious regular distribution. The cable design needs to consider the limit value. The cable structure is generally layered from the inside to the outside, and has a circular surface. When the cable is twisted, displacement, friction, and wear will occur between the layers. The cable structures are unevenly stressed and the degree of twisting is different. The structure with concentrated force is very easy to be damaged. Utility Model Content

[0003] Purpose of the invention: The purpose of the utility model is to overcome the deficiencies in the prior art and to provide a wind power cable in which the insulating cores are dispersedly arranged and do not contact each other, the insulating layer is two-layered, when the cable is subjected to force and torsion, the first layer of insulation will not be subject to friction, the inner sheath is embedded with a steel wire bundle force-bearing structure, the contact surfaces of the various layers of the cable are non-circular, and layer separation will not occur, and the overall torsion resistance is high.

[0004] Technical solution: In order to solve the above technical problems, the utility model describes an integral high-torsion-resistant wind power cable, which includes a conductor, a first layer of insulation extruded on the outside of the conductor, a second layer of insulation is provided outside the first layer of insulation, which constitute an insulating core, 3 or 4 insulating cores are twisted around a central cushion core to form a cable core, an inner cushion layer is extruded on the outside of the cable core, a steel wire bundle is wrapped around the outside of the inner cushion layer, an inner sheath is extruded on the outside of the steel wire bundle, and an outer sheath is provided outside the inner sheath.

[0005] Furthermore, the conductor adopts tinned copper wire twisted wire, the single wire diameter is not more than 0.4mm, the number of strands is not more than 25, the twisted structure adopts a regular twisted structure with 1 strand in the center, when each strand is bundled, the pitch diameter ratio is not more than 25 times, and when the strands are twisted, the pitch diameter ratio is not more than 16 times.

[0006] Furthermore, the first layer of insulation is made of ethylene propylene rubber, and the insulation thickness is not less than 1.0 mm, and the thickness increases accordingly with the increase of the nominal cross-sectional area of ​​the conductor. The second layer of insulation is made of wear-resistant polyurethane elastomer rubber, and the thickness is not less than 0.6 mm. The first layer of insulation and the second layer of insulation are formed by double-layer co-extrusion.

[0007] Furthermore, the central cushion core is made of highly elastic natural rubber, with three or four grooves on the outside, corresponding to three-core or four-core cables. The diameter of the groove is completely consistent with the diameter of the corresponding insulating core. The distance between the straight line connecting the two vertices A and B of the groove and the center O1 is 0.8-1.0mm, the minimum distance h between adjacent grooves is not less than 1.2mm, and the distance L from the minimum distance to the straight line edge of the central cushion core is not less than ½ the radius of the insulating core. The groove of the central cushion core spirally rises in the length direction, and the spiral rise angle is 85°-90°.

[0008] Furthermore, the outer surface of the inner cushion layer is hexagonal, and the inner surface of the inner cushion layer is in close contact with the straight edge of the central cushion core and the second layer of insulation where the insulating core is exposed from the central cushion core groove. The inner cushion layer is made of high-elastic natural rubber, and the minimum thickness of the inner cushion layer is not less than 1.0 mm.

[0009] Furthermore, the steel wire bundle is a twisted structure of 7 steel wires, each steel wire has a diameter of 0.3-0.5 mm, 2-3 bundles are placed equidistantly outside each straight edge of the inner cushion layer, a total of 12 or 18 bundles, twisted outside the inner cushion layer, and the twisted pitch-diameter ratio is 35-40 times.

[0010] Furthermore, the inner sheath and the outer sheath are formed by double-layer co-extrusion, the inner sheath is embedded in the gap of the steel wire bundle, the inner surface of the inner sheath is tightly fitted with the outer hexagon of the inner cushion layer, the inner sheath is made of elastomeric rubber, and the outer sheath is made of oil-resistant rubber elastomer, the minimum thickness of the inner sheath is not less than 1.2mm, and the average thickness of the outer sheath is not less than 2.4mm.

[0011] Beneficial effect: Compared with the prior art, the utility model has the following significant advantages: the utility model is a three-core or four-core low-voltage structure, the insulating cores are twisted around the central cushion core, the central cushion core separates the insulating cores, and the cores do not contact each other. When the insulating cores are twisted, they are squeezed into the outer groove of the central cushion core and fit tightly with the central cushion core. The cable does not separate when it is subjected to force and torsion. The conductor is double-insulated with ethylene-propylene rubber and wear-resistant polyurethane elastomer rubber, which are co-extruded. The central cushion core uses natural rubber with excellent elasticity.

[0012] The outer surface of the cable core with twisted insulated core is a hexagonal inner cushion layer, and the inner surface of the inner cushion layer is in close contact with the straight edge of the center cushion core and the second insulating layer where the insulated core is exposed from the center cushion core groove. The inner cushion layer is made of natural rubber, which fits well with the center cushion core, and the materials of the insulated core inside and outside are consistent. The inner and outer surfaces of the inner cushion layer are non-circular, and they form an embedded structure with other internal and external structures to form an integral structure. When the cable is twisted, it will not be separated from the layer.

[0013] 2-3 bundles of steel wires are placed at equal distances outside each straight edge of the inner cushion layer, with a total of 12 or 18 bundles, which are twisted outside the inner cushion layer.

[0014] The inner and outer sheaths are double-layer co-extruded, the inner sheath is made of elastomer rubber, and the outer sheath is made of oil-resistant rubber elastomer. The inner sheath is embedded in the gap of the steel wire bundle, and the inner surface of the inner sheath fits tightly with the outer hexagon of the inner cushion layer to form an integral structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the overall structure of the utility model Figure 1 ;

[0016] Figure 2 This is a schematic diagram of the structure of the central cushion core of the utility model. Figure 1 ;

[0017] Figure 3 This is a schematic diagram of the overall structure of the utility model Figure 2 ;

[0018] Figure 4 This is a schematic diagram of the structure of the central cushion core of the utility model. Figure 2 . DETAILED DESCRIPTION

[0019] The utility model is further described below in conjunction with the accompanying drawings and embodiments. Example 1

[0020] like Figure 1 and Figure 2 As shown, the utility model describes an integral high-torsion-resistant wind power cable, wherein the conductor 1 is extruded with a first layer of insulation 2, a second layer of insulation 3, four insulating cores are twisted around a central cushion core 4 to form a cable core, an extruded inner cushion layer 5, a wrapped steel wire bundle 6, an extruded inner sheath 7, and an outer sheath 8.

[0021] Conductor 1 is made of tinned copper wire stranded wire, the diameter of the single wire is not more than 0.4mm, the number of strands is not more than 25, the stranded structure is a regular stranded structure with 1 strand in the center, and non-woven fabric is used for tension wrapping during stranding to make the conductor surface round and reduce the gap between the strands. The non-woven fabric is removed before extruding insulation. When each strand is bundled, the pitch-diameter ratio is not more than 25 times, and when the strands are stranded, the pitch-diameter ratio is not more than 16 times.

[0022] The first layer of insulation 2 is made of ethylene propylene rubber, and the insulation thickness is not less than 1.0mm, and the thickness increases accordingly with the increase of the nominal cross-sectional area of ​​the conductor. The second layer of insulation 3 is made of wear-resistant polyurethane elastomer rubber, and the thickness is not less than 0.6mm. The first layer of insulation 2 and the second layer of insulation 3 are double-layer co-extruded. The non-woven fabric outside the conductor 1 is removed before extruding the insulation layer. The first layer of insulation 2 is pressed into the gap at the outer edge of the conductor, tightly combined with the conductor 1, and the whole is stressed. The second layer of insulation 3 has high wear resistance, which protects the cable from damaging the first layer of insulation 2 when it is subjected to force and torsion, thereby ensuring the insulation safety of the cable.

[0023] The center cushion core 4 is made of highly elastic natural rubber, with four grooves on the outside, corresponding to the four-core cable. The diameter of the groove is completely consistent with the diameter of the corresponding insulating core. The distance between the straight line connecting the two vertices A and B of the groove and the center O1 is 0.8-1.0mm, that is, the length of the AB straight line is 0.1-0.4mm smaller than the diameter CD of the insulating core. Pressure is required when the insulating core is embedded, and it will not loosen after entering. The minimum distance h between adjacent grooves is not less than 1.2mm, and the distance L from the minimum distance to the edge of the center cushion core 4 is not less than ½ the radius of the insulating core to ensure the mechanical strength of the center cushion core. The groove of the center cushion core 4 is spirally ascending in the length direction, and the spiral rise angle is 85°-90°. The insulating core is twisted around the center cushion core 4 to form a cable core. When twisting, non-woven fabric is used for tension wrapping, and molded to make the insulating core embedded in the groove. The non-woven fabric is removed before extruding the inner cushion layer 5.

[0024] The outer surface of the inner cushion layer 5 is hexagonal, and the inner surface of the inner cushion layer 5 is in close contact with the straight edge of the center cushion core 4 and the second insulation layer 3 where the insulating core is exposed from the groove of the center cushion core 4. The material of the inner cushion layer 5 is highly elastic natural rubber, which can fit well with the center cushion core 4 to protect the insulating core. The inner and outer surfaces of the inner cushion layer 5 are both non-circular, and are embedded with other internal and external structures to form an integral structure. When the cable is twisted, it will not be delaminated. The minimum thickness of the inner cushion layer 5 is not less than 1.0mm.

[0025] The steel wire bundle 6 is a twisted structure of 7 wires, with a steel wire diameter of 0.3-0.5 mm, 3 bundles are placed equidistantly outside each straight edge of the inner cushion layer 5, a total of 18 bundles, twisted outside the inner cushion layer 5, and the twisted pitch-diameter ratio is 35-40 times. The steel wire bundle 6 plays a role of bearing force.

[0026] The inner sheath 7 and the outer sheath 8 are double-layer co-extruded, the inner sheath 7 is embedded in the gap of the steel wire bundle 6, and the inner surface of the inner sheath 7 is tightly fitted with the outer hexagon of the inner cushion layer 5 to form an integral structure. The inner sheath 7 is made of elastomer rubber, and the outer sheath 8 is made of oil-resistant rubber elastomer to protect the internal structure of the cable. The minimum thickness of the inner sheath 7 is not less than 1.2mm, and the average thickness of the outer sheath 8 is not less than 2.4mm. Example 2

[0027] like Figure 3 and Figure 4 As shown, the utility model describes an integral high-torsion-resistant wind power cable, wherein the conductor 1 is extruded with a first layer of insulation 2, a second layer of insulation 3, three insulating cores are twisted around a central cushion core 4 to form a cable core, an extruded inner cushion layer 5, a wrapped steel wire bundle 6, an extruded inner sheath 7, and an outer sheath 8.

[0028] Conductor 1 is made of tinned copper wire stranded wire, the diameter of the single wire is not more than 0.4mm, the number of strands is not more than 25, the stranded structure is a regular stranded structure with 1 strand in the center, and non-woven fabric is used for tension wrapping during stranding to make the conductor surface round and reduce the gap between the strands. The non-woven fabric is removed before extruding insulation. When each strand is bundled, the pitch-diameter ratio is not more than 25 times, and when the strands are stranded, the pitch-diameter ratio is not more than 16 times.

[0029] The first layer of insulation 2 is made of ethylene propylene rubber, and the insulation thickness is not less than 1.0mm, and the thickness increases accordingly with the increase of the nominal cross-sectional area of ​​the conductor. The second layer of insulation 3 is made of wear-resistant polyurethane elastomer rubber, and the thickness is not less than 0.6mm. The first layer of insulation 2 and the second layer of insulation 3 are double-layer co-extruded. The non-woven fabric outside the conductor 1 is removed before extruding the insulation layer. The first layer of insulation 2 is pressed into the gap at the outer edge of the conductor, tightly combined with the conductor 1, and the whole is stressed. The second layer of insulation 3 has high wear resistance, which protects the cable from damaging the first layer of insulation 2 when it is subjected to force and torsion, thereby ensuring the insulation safety of the cable.

[0030] The center cushion core 4 is made of highly elastic natural rubber, with three grooves on the outside, corresponding to the three-core cable. The diameter of the groove is completely consistent with the diameter of the corresponding insulating core. The distance between the straight line connecting the two vertices A and B of the groove and the center O1 is 0.8-1.0mm, that is, the length of the AB straight line is 0.1-0.4mm smaller than the diameter CD of the insulating core. Pressure is required when the insulating core is embedded, and it will not loosen after entering. The minimum distance h between adjacent grooves is not less than 1.2mm, and the distance L from the minimum distance to the edge of the center cushion core 4 is not less than ½ the radius of the insulating core to ensure the mechanical strength of the center cushion core. The groove of the center cushion core 4 is spirally ascending in the length direction, and the spiral rise angle is 85°-90°. The insulating core is twisted around the center cushion core 4 to form a cable core. When twisting, non-woven fabric is used for tension wrapping, and molded to make the insulating core embedded in the groove. The non-woven fabric is removed before extruding the inner cushion layer 5.

[0031] The outer surface of the inner cushion layer 5 is hexagonal, and the inner surface of the inner cushion layer 5 is in close contact with the straight edge of the center cushion core 4 and the second insulation layer 3 where the insulating core is exposed from the groove of the center cushion core 4. The material of the inner cushion layer 5 is highly elastic natural rubber, which can fit well with the center cushion core 4 to protect the insulating core. The inner and outer surfaces of the inner cushion layer 5 are both non-circular, and are embedded with other internal and external structures to form an integral structure. When the cable is twisted, it will not be delaminated. The minimum thickness of the inner cushion layer 5 is not less than 1.0mm.

[0032] The steel wire bundle 6 is a twisted structure of 7 wires, with a steel wire diameter of 0.3-0.5 mm, 3 bundles are placed equidistantly outside each straight edge of the inner cushion layer 5, a total of 18 bundles, twisted outside the inner cushion layer 5, and the twisted pitch-diameter ratio is 35-40 times. The steel wire bundle 6 plays a role of bearing force.

[0033] The inner sheath 7 and the outer sheath 8 are double-layer co-extruded, the inner sheath 7 is embedded in the gap of the steel wire bundle 6, and the inner surface of the inner sheath 7 is tightly fitted with the outer hexagon of the inner cushion layer 5 to form an integral structure. The inner sheath 7 is made of elastomer rubber, and the outer sheath 8 is made of oil-resistant rubber elastomer to protect the internal structure of the cable. The minimum thickness of the inner sheath 7 is not less than 1.2mm, and the average thickness of the outer sheath 8 is not less than 2.4mm.

[0034] The utility model has a three-core or four-core low-voltage structure, and the insulating cores are twisted around the central pad core, and the central pad core separates the insulating cores, and the cores do not contact each other. When the insulating cores are twisted, they are squeezed into the outer groove of the central pad core, and fit closely with the central pad core, and do not separate when the cable is subjected to force and twisting. The conductor is double-insulated with ethylene propylene rubber and wear-resistant polyurethane elastomer rubber, and co-extruded. The central pad core adopts natural rubber with excellent elasticity. The outer surface of the cable core of the twisted insulating core is a hexagonal inner pad layer, and the inner surface of the inner pad layer is in close contact with the straight edge of the central pad core and the second insulating layer of the insulating core exposed in the groove of the central pad core. The material of the inner pad layer is natural rubber, which can fit well with the central pad core, and the material of the inner and outer contacts of the insulating core is consistent. The inner and outer surfaces of the inner pad layer are non-circular, and form an embedded structure with other internal and external structures to form an integral structure. When the cable is twisted, it will not be delaminated and detached. 2-3 bundles of steel wires are placed at equal distances outside each straight edge of the inner pad layer, with a total of 12 or 18 bundles, which are twisted outside the inner pad layer. The inner and outer sheaths are double-layer co-extruded, the inner sheath is made of elastomer rubber, and the outer sheath is made of oil-resistant rubber elastomer. The inner sheath is embedded in the gap of the steel wire bundle, and the inner surface of the inner sheath fits tightly with the outer hexagon of the inner cushion layer to form an integral structure.

[0035] The present invention provides a thought and method. There are many methods and ways to implement the technical solution. The above is only the preferred implementation mode of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention. All components not specified in this embodiment can be implemented by existing technologies.

Claims

1. An integral high torsion resistance wind power cable, characterized in that: It comprises a conductor (1), a first layer of insulation (2) extruded outside the conductor (1), a second layer of insulation (3) provided outside the first layer of insulation (2), which form an insulated wire core, three or four insulated wire cores twisted around a central cushion core (4) to form a cable core, an inner cushion layer (5) extruded outside the cable core, a steel wire bundle (6) wrapped outside the inner cushion layer (5), an inner sheath (7) extruded outside the steel wire bundle (6), and an outer sheath (8) provided outside the inner sheath (7).

2. The integral high torsion resistance wind power cable according to claim 1 is characterized in that: The conductor (1) is a tinned copper wire stranded wire, the diameter of the single wire is not greater than 0.4 mm, the number of strands per strand is not more than 25, the stranded structure is a regular stranded structure with one strand in the center, when each strand is bundled, the pitch-to-diameter ratio is not greater than 25 times, and when the strands are stranded, the pitch-to-diameter ratio is not greater than 16 times.

3. The integral high torsion resistance wind power cable according to claim 1 is characterized in that: The first insulation layer (2) is made of ethylene propylene rubber, and the insulation thickness is not less than 1.0 mm, and the thickness increases accordingly with the increase of the nominal cross-sectional area of ​​the conductor. The second insulation layer (3) is made of wear-resistant polyurethane elastomer rubber, and the thickness is not less than 0.6 mm. The first insulation layer (2) and the second insulation layer (3) are formed by double-layer co-extrusion.

4. The integral high torsion resistance wind power cable according to claim 1 is characterized in that: The central cushion core (4) is made of highly elastic natural rubber and has three or four grooves on the outside, corresponding to a three-core or four-core cable. The diameter of the groove is completely consistent with the diameter of the corresponding insulating core. The distance between the straight line connecting the two vertices A and B of the groove and the center O1 is 0.8-1.0 mm. The minimum distance h between adjacent grooves is not less than 1.2 mm. The distance L from the minimum distance to the straight line at the edge of the central cushion core is not less than ½ the radius of the insulating core. The groove of the central cushion core (4) rises in a spiral in the length direction, and the spiral rise angle is 85°-90°.

5. The integral high torsion resistance wind power cable according to claim 1 is characterized in that: The outer surface of the inner cushion layer (5) is hexagonal, and the inner surface of the inner cushion layer (5) is in close contact with the straight edge of the central cushion core (4) and the second insulation layer (3) where the insulating wire core is exposed from the groove of the central cushion core (4). The inner cushion layer (5) is made of high-elastic natural rubber, and the minimum thickness of the inner cushion layer (5) is not less than 1.0 mm.

6. The integral high torsion resistance wind power cable according to claim 1, characterized in that: The steel wire bundle (6) is a twisted structure of 7 steel wires, each steel wire having a diameter of 0.3-0.5 mm. 2-3 bundles are placed at equal distances outside each straight edge of the inner cushion layer (5), for a total of 12 or 18 bundles, which are twisted outside the inner cushion layer (5), and the twisted pitch-diameter ratio is 35-40 times.

7. The integral high torsion resistance wind power cable according to claim 1, characterized in that: The inner sheath (7) and the outer sheath (8) are formed by double-layer co-extrusion. The inner sheath (7) is embedded in the gap between the steel wire bundles (6). The inner surface of the inner sheath (7) is tightly fitted with the outer hexagon of the inner cushion layer (5). The inner sheath (7) is made of elastomer rubber, and the outer sheath (8) is made of oil-resistant rubber elastomer. The minimum thickness of the inner sheath (7) is not less than 1.2 mm, and the average thickness of the outer sheath (8) is not less than 2.4 mm.

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