Special-shaped aluminum conductors and cables

Abstract

The present invention relates to a special-shaped aluminum conductor and cable. The special-shaped aluminum conductor includes a core, an intermediate stranded wire layer with a circular cross-section is provided on the outer periphery of the core according to a first stranding direction, and an outer stranded wire layer with a circular cross-section is provided on the outer periphery of the intermediate stranded wire layer according to a second stranding direction. The intermediate stranded wire layer includes a plurality of intermediate aluminum alloy wires with a tile-shaped cross-section, and the outer stranded wire layer includes a plurality of outer aluminum alloy wires with a tile-shaped cross-section. A first internal decompression space inclined according to the first stranding direction is formed between the inner corners of two adjacent intermediate aluminum alloy wires, and at least part of the side surfaces of the two adjacent intermediate aluminum alloy wires coincide with each other; a second internal decompression space inclined according to the second stranding direction is formed between the inner corners of two adjacent outer aluminum alloy wires, and at least part of the side surfaces of the two adjacent outer aluminum alloy wires coincide with each other. Advantages of the present application: The tightness after stranding is improved. It solves the defects of the prior art such as unreasonable design.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric power, and in particular relates to a special-shaped aluminum conductor and a cable. Background Art

[0002] The cable has a built-in conductor, for example, an aluminum alloy conductor. Chinese patent publication number CN104575696A discloses an aluminum alloy cable conductor, including a conductor body with a circular cross-section, the conductor body including a cylindrical central circular portion and an outer ring portion sleeved outside the central circular portion, the outer ring portion further including an inner ring portion sleeved outside the central circular portion and an outer ring portion sleeved outside the inner ring portion, the inner ring portion including a plurality of inner ring tile-shaped blocks, each of which is spliced ​​along the circumferential direction, the outer ring portion including a plurality of outer ring tile-shaped blocks, each of which is spliced ​​along the circumferential direction. In this solution, when twisting the wires, the single conductor wire cannot cope with the deformation avoidance of the single conductor wire in the thickness direction, resulting in the overall roundness being affected. In order to improve the existing technology, for example, Chinese patent publication No. CN103000261A discloses a special-shaped aluminum alloy stranded conductor, which is formed by concentrically twisting multiple aluminum alloy monofilament wires. Except for the center of the stranded wire, each layer is formed by concentrically twisting multiple special-shaped aluminum alloy monofilament wires. The cross-section of the special-shaped aluminum alloy monofilament wire is a special-shaped isosceles trapezoid, and the special-shaped isosceles trapezoid is an isosceles trapezoid with the long base replaced by a circular arc. The center of the circular arc coincides with the intersection of the extension line of the waistline of the special-shaped isosceles trapezoid. The stranded wire center of the special-shaped aluminum alloy stranded conductor is formed by twisting multiple fan-shaped aluminum alloy monofilament wires, or by twisting multiple special-shaped aluminum alloy monofilament wires, or is a single circular aluminum alloy monofilament wire. This solution sets a symmetrical chamfered structure on each inner and outer corner of each conductor wire. However, this solution cannot completely solve the problem that the deformation pressure of the stranded wire is difficult to release in time when it is deformed, resulting in a large gap between the conductor wires. Finally, in the extrusion process, the extrusion pressure carried by the extruded material causes the gap uniformity to change. Therefore, the roundness of the cable cross section needs to be further improved. Summary of the Invention

[0003] The purpose of the present invention is to provide a special-shaped aluminum conductor and cable that can solve the above technical problems.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] The special-shaped aluminum conductor includes a core, an intermediate stranded wire layer having a circular cross-section arranged on the outer periphery of the core in a first stranding direction, and an outer stranded wire layer having a circular cross-section arranged on the outer periphery of the intermediate stranded wire layer in a second stranding direction. The intermediate stranded wire layer includes a plurality of intermediate aluminum alloy wires having a tile-shaped cross-section, and the outer stranded wire layer includes a plurality of outer aluminum alloy wires having a tile-shaped cross-section. The stranding direction of the intermediate aluminum alloy wires is opposite to that of the outer aluminum alloy wires. A first internal reduced-pressure space inclined in the first stranding direction is formed between the inner corners of two adjacent intermediate aluminum alloy wires, and at least some side surfaces of the two adjacent intermediate aluminum alloy wires coincide with each other. A second internal reduced-pressure space inclined in the second stranding direction is formed between the inner corners of two adjacent outer aluminum alloy wires, and at least some side surfaces of the two adjacent outer aluminum alloy wires coincide with each other.

[0006] In the above-mentioned special-shaped aluminum conductor, a first outer decompression space is formed between the outer corners of two adjacent middle aluminum alloy wires, and the radial depth of the first outer decompression space in the middle stranded wire layer is smaller than the radial depth of the first inner decompression space.

[0007] In the above-mentioned special-shaped aluminum conductor, a second outer decompression space is formed between the outer corners of two adjacent outer aluminum alloy wires, and the radial depth of the second outer decompression space in the outer stranded wire layer is smaller than the radial depth of the second inner decompression space.

[0008] In the above-mentioned special-shaped aluminum conductor, the intermediate aluminum alloy wire has a first contact side surface and a second contact side surface, and the inner side of the intermediate aluminum alloy wire has two corners, one of the corners is provided with a first small arc chamfer, and the other corner is provided with a first large arc chamfer;

[0009] The first contact side surface and the second contact side surface of the two adjacent middle aluminum alloy wires coincide with each other and the first large arc chamfer is tangent to the first contact side surface; and the adjacent first large arc chamfer and the first small arc chamfer are enclosed with the corresponding first contact side surface to form a first internal decompression space inclined according to the first stranding direction.

[0010] In the above-mentioned special-shaped aluminum conductor, the first contact side surface of the intermediate aluminum alloy wire and the center of the intermediate aluminum alloy wire form a first angle, and the second contact side surface of the intermediate aluminum alloy wire and the center of the intermediate aluminum alloy wire form a second angle, and the first angle is smaller than the second angle, so that the side of the intermediate aluminum alloy wire close to the second contact side surface has an asymmetric wedge-shaped portion.

[0011] In the above-mentioned special-shaped aluminum conductor, both the first inner decompression space and the second inner decompression space are triangular.

[0012] In the above-mentioned special-shaped aluminum conductor, the outer aluminum alloy wire has two symmetrically distributed third contact side surfaces, and the inner side of each outer aluminum alloy wire has two corners, one of the corners of the outer aluminum alloy wire is provided with a second small rounded corner, and the other corner of the outer aluminum alloy wire is provided with a second large rounded corner;

[0013] The second large fillet is tangent to one of the adjacent third contact side surfaces, and the adjacent second small fillet and the second large fillet are enclosed with one of the corresponding third contact side surfaces to form the second inner decompression space inclined according to the second strand direction.

[0014] The present application also provides a cable, which includes the special-shaped aluminum conductor.

[0015] In the above-mentioned cable, the cable further comprises an insulating layer extruded on the outer peripheral surface of the special-shaped aluminum conductor, and the insulating layer has an embedded portion embedded between the outer corners of two adjacent outer aluminum alloy wires.

[0016] In the above-mentioned cable, a sheath is extruded on the outer circumference of the insulating layer, and a glass reinforcement layer is provided between the outer circumference of the insulating layer and the inner wall of the sheath, at least part of the reinforcement layer is embedded in the insulating layer, and the remaining part of the reinforcement layer is embedded in the sheath.

[0017] Compared with the existing technology, the advantages of this application are:

[0018] During stranding, the inner side of the intermediate aluminum alloy wire is compressed in the thickness direction, and the two adjacent intermediate aluminum alloy wires are constrained by the contact surface (the first contact side surface and the second contact side surface as shown below). Since the first internal decompression space is located next to the pressure point closest to the inner side of the intermediate aluminum alloy wire, the inclined first internal decompression space can change the deformation of the intermediate aluminum alloy wire in the thickness direction to the side deformation, that is, the deformation of the intermediate aluminum alloy wire is timely decompressed by the first internal decompression space and the deformation amount is accommodated by the first internal decompression space, thereby ensuring that several intermediate aluminum alloy wires fit tightly after stranding.

[0019] Similarly, when the outer aluminum alloy wires are twisted, the inner sides in the thickness direction are compressed, and the adjacent two outer aluminum alloy wires are constrained by the contact surface (the third contact side surface below). Since the second inner decompression space is located next to the pressure point closest to the inner side of the middle aluminum alloy wire, the inclined second inner decompression space can change the deformation of the outer aluminum alloy wire in the thickness direction to deformation to the side, that is, the deformation of the outer aluminum alloy wire is timely decompressed by the second inner decompression space and the deformation amount is accommodated by the second inner decompression space, thereby ensuring that several outer aluminum alloy wires fit tightly after twisting.

[0020] Since they are all distributed obliquely according to the direction of the twisted wire, for example, at this time the second contact side surface close to the first internal decompression space side contacts the adjacent first contact side surface. Because the surface area of ​​the second contact side surface is smaller than the surface area of ​​the first contact side surface, and there is an internal decompression space, the deformation can be absorbed in time and the roundness can be ensured.

[0021] The radial depth of the first outer decompression space is designed to allow the first inner decompression space to directly absorb the majority of deformation, while the remaining deformation is absorbed by the first outer decompression space. Similarly, a second outer decompression space is formed between the outer corners of two adjacent outer aluminum alloy wires, and its radial depth within the outer stranded wire layer is less than that of the second inner decompression space.

[0022] Because the multiple aluminum alloy wires in the middle stranded layer of the shaped aluminum conductor have relatively good inter-contact surfaces, as do the outer aluminum alloy wires in the outer stranded layer, this prevents extruded material from entering the second inner decompression space, the first outer decompression space, and the first inner decompression space during insulation extrusion, further improving roundness. In other words, while ensuring the roundness of the shaped aluminum conductor, it also prevents extruded material from squeezing through the gaps during extrusion, which could lead to a decrease in roundness after extrusion.

[0023] In addition, the waste of extruded materials can be prevented to a certain extent, thereby reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the transverse cross-sectional structure of the special-shaped aluminum conductor provided by the present invention.

[0025] Figure 2 yes Figure 1 A in the figure is an enlarged structural diagram.

[0026] Figure 3 It is a schematic diagram of the transverse cross-sectional structure of the intermediate aluminum alloy wire provided by the present invention.

[0027] Figure 4 It is a schematic diagram of the transverse cross-sectional structure of the cable provided by the present invention.

[0028] In the figure, the core 1, the middle stranded wire layer 2, the middle aluminum alloy wire 20, the first inner decompression space 21, the first outer decompression space 22, the first small arc chamfer 23, the first large arc chamfer 24, the first included angle 25, the second included angle 26, the asymmetric wedge-shaped portion 27, the first contact side 200, the second contact side 201, the outer stranded wire layer 3, the outer aluminum alloy wire 30, the second inner decompression space 31, the second outer decompression space 32, the second small fillet 33, the second large fillet 34, the third contact side 300, the insulating layer 4, the embedded portion 40, the sheath 5, the reinforcement layer 6, and the braided sleeve 7. DETAILED DESCRIPTION

[0029] The following are specific embodiments of the invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0030] Example 1, as Figure 1 As shown, the special-shaped aluminum conductor includes a core 1 , the cross section of the core 1 is circular, and is made of metal steel, for example.

[0031] An intermediate stranded wire layer 2 with a circular cross-section is arranged around the outer periphery of the core 1 in a first stranding direction. An outer stranded wire layer 3 with a circular cross-section is arranged around the outer periphery of the intermediate stranded wire layer 2 in a second stranding direction. The first stranding direction is, for example, clockwise, while the second stranding direction is, for example, counterclockwise. Different stranding directions achieve better roundness and tightness.

[0032] Secondly, the middle stranded wire layer 2 includes a plurality of middle aluminum alloy wires 20 having a tile-shaped cross section, and the outer stranded wire layer 3 includes a plurality of outer aluminum alloy wires 30 having a tile-shaped cross section. The total number of outer aluminum alloy wires 30 is greater than the total number of middle aluminum alloy wires 20. For example, the total number of middle aluminum alloy wires 20 is five, while the number of outer stranded wires 3 is eight.

[0033] like Figure 1 and Figure 2 As shown, a first internal decompression space 21 inclined along the first twisting direction is formed between the inner corners of two adjacent middle aluminum alloy wires 20, and at least part of the side surfaces of the two adjacent middle aluminum alloy wires 20 coincide with each other; a second internal decompression space 31 inclined along the second twisting direction is formed between the inner corners of two adjacent outer aluminum alloy wires 30, and at least part of the side surfaces of the two adjacent outer aluminum alloy wires 30 coincide with each other.

[0034] When twisting the wire, Figure 1-Figure 3 As shown, the inner sides of the intermediate aluminum alloy wires 20 in the thickness direction are compressed when they are twisted, and the adjacent intermediate aluminum alloy wires 20 are constrained by the contact surfaces (the first contact side surface 200 and the second contact side surface 201 shown below). Since the first internal decompression space 21 is located next to the pressure point closest to the inner side of the intermediate aluminum alloy wires 20, the inclined first internal decompression space 21 can change the deformation of the intermediate aluminum alloy wires 20 in the thickness direction to deformation toward the side, that is, the deformation of the intermediate aluminum alloy wires 20 is timely decompressed and the deformation amount is accommodated by the first internal decompression space 21, thereby ensuring that the multiple intermediate aluminum alloy wires 20 are tightly matched after twisting.

[0035] Likewise, if Figure 1-Figure 3As shown, the inner sides of the outer aluminum alloy wires 30 in the thickness direction are compressed when they are twisted, and the adjacent outer aluminum alloy wires 30 are constrained by the contact surface (the third contact side surface 300 shown below). Since the second inner decompression space 31 is located next to the pressure point closest to the inner side of the middle aluminum alloy wire 20, the inclined second inner decompression space 31 can change the deformation of the outer aluminum alloy wires 30 in the thickness direction to deformation toward the side, that is, the deformation of the outer aluminum alloy wires 30 is timely decompressed and the deformation amount is accommodated by the second inner decompression space 31, thereby ensuring that the multiple outer aluminum alloy wires 30 are tightly matched after being twisted.

[0036] Furthermore, since they are all distributed obliquely according to the direction of the twisted wire, for example, at this time, the second contact side 201 close to the first internal decompression space 21 is in contact with the adjacent first contact side 200. Because the surface area of ​​the second contact side 201 is smaller than the surface area of ​​the first contact side 200, and there is an internal decompression space, the deformation can be absorbed in time and the roundness can be ensured.

[0037] Specifically, if Figure 1-Figure 3 As shown, in this embodiment, a first outer decompression space 22 is formed between the outer corners of two adjacent middle aluminum alloy wires 20. The radial depth of the first outer decompression space 22 within the middle stranded wire layer 2 is less than the radial depth of the first inner decompression space 21. The radial depth of the first outer decompression space 22 is designed so that the first inner decompression space 21 directly absorbs the majority of deformation, while the remaining deformation is absorbed by the first outer decompression space 22.

[0038] Similarly, a second outer decompression space 32 is formed between outer corners of two adjacent outer aluminum alloy wires 30 , and the radial depth of the second outer decompression space 32 in the outer stranded wire layer 3 is smaller than the radial depth of the second inner decompression space 31 .

[0039] In this embodiment, the middle stranded wire layer 2 and the outer stranded wire layer 3 of the inner and outer layers are provided with a first inner decompression space 21 and a second inner decompression space 31 in a triangular shape for absorbing the deformation, thereby making the strands of the middle aluminum alloy wire 20 and the outer aluminum alloy wire 30 more tightly twisted.

[0040] Example 2, based on Example 1, as Figure 1-Figure 3 As shown, this embodiment further discloses that the intermediate aluminum alloy wire 20 has a first contact side surface 200 and a second contact side surface 201, the first contact side surfaces 200 and the second contact side surfaces 201 of two adjacent intermediate aluminum alloy wires 20 coincide with each other, and the inner side of the intermediate aluminum alloy wire 20 has two corners, one of which is provided with a first small arc chamfer 23, and the other corner is provided with a first large arc chamfer 24;

[0041] It can be understood that the fillet radius of the first small arc chamfer 23 in this embodiment is smaller than the fillet radius of the first large arc chamfer 24. Through the design of the first large arc chamfer 24, the first large arc chamfer 24 can be made tangent to the first contact side surface 200; because the adjacent first large arc chamfer 24 and the first small arc chamfer 23 are enclosed with the corresponding first contact side surface 200 to form a first internal decompression space 21 inclined according to the direction of the first twisted wire, the first internal decompression space 21 at this time is a trumpet space, which is conducive to the absorption of deformation at the tangent position.

[0042] The first contact side surface 200 of the intermediate aluminum alloy wire 20 and the center of the intermediate aluminum alloy wire 20 form a first angle 25, and the second contact side surface 201 of the intermediate aluminum alloy wire 20 and the center of the intermediate aluminum alloy wire 20 form a second angle 26. The first angle 25 is smaller than the second angle 26, so that the side of the intermediate aluminum alloy wire 20 close to the second contact side surface 201 has an asymmetric wedge portion 27.

[0043] It can be understood that the intermediate aluminum alloy wire 20 in this embodiment adopts a method of different angles on the two side surfaces. Because the angles of the two side surfaces are different, the stranding forces they are subjected to during stranding are different. Moreover, since the first large arc chamfer 24 is located close to the side of the asymmetric wedge-shaped portion 27, the gap formed by the tangency of the first large arc chamfer 24 and the first contact side surface 200 is equivalent to further deepening the radial depth. This structure facilitates the release of the deformation. At the same time, the first contact side surface 200 eliminates the gap caused by the absorption of the deformation and plays a deformation barrier role. Secondly, since the first internal decompression space 21 is inclined and located on the inner corner side, when the first internal decompression space 21 completes the absorption of the corresponding deformation, it will not affect the roundness of the outer arc surface of the intermediate aluminum alloy wire 20, so as to ensure the roundness of the entire intermediate stranded wire layer 2 after stranding, so as to facilitate the subsequent extrusion processing and ensure the thickness uniformity of the extruded layer in the circumferential direction.

[0044] Example 3, based on Example 1 and Example 2, as Figure 1-Figure 3 As shown, this embodiment further discloses that the outer aluminum alloy wire 30 has two symmetrically distributed third contact side surfaces 300, and the inner side of each outer aluminum alloy wire 30 has two corners, wherein a second small rounded corner 33 is provided at the corner of one outer aluminum alloy wire 30, and a second large rounded corner 34 is provided at the corner of the other outer aluminum alloy wire 30;

[0045] The second large rounded corner 34 is tangent to one of the adjacent third contact side surfaces 300, and the adjacent second small rounded corner 33 and the second large rounded corner 34, together with the corresponding one of the third contact side surfaces 300, form a second internal decompression space 31 inclined in the direction of the second strand. The function of the second large rounded corner 34 is the same as that of the first large arc chamfer 24 and will not be further described in this embodiment.

[0046] Example 4, as Figures 1-4 As shown, this embodiment provides a cable including the shaped aluminum conductor of Embodiment 1, Embodiment 2, or Embodiment 3. It also includes an insulation layer 4 extruded onto the outer circumference of the shaped aluminum conductor. The insulation layer 4 has an embedded portion 40 embedded between the outer corners of two adjacent outer aluminum alloy wires 30. The embedded portion 40 fills the space between the outer corners of the outer aluminum alloy wires 30. Furthermore, during extrusion of the insulation layer 4, due to the relatively good inter-contact surface fit between the intermediate aluminum alloy wires 20 of the intermediate stranded wire layer 2 of the shaped aluminum conductor and the relatively good inter-contact surface fit between the outer aluminum alloy wires 30 of the outer stranded wire layer 3, extruded material is prevented from entering the second inner decompression space 31, the first outer decompression space 22, and the first inner decompression space 21, further improving roundness.

[0047] That is, while ensuring the roundness of the special-shaped aluminum conductor, it is possible to prevent the extruded material from squeezing the gap during extrusion and causing the roundness after extrusion to decrease.

[0048] In addition, the waste of extruded materials can be prevented to a certain extent, thereby reducing production costs.

[0049] Furthermore, a jacket 5 is extruded on the outer circumference of the insulating layer 4, and a reinforcement layer 6 is provided between the outer circumference of the insulating layer 4 and the inner wall of the jacket 5. At least a portion of the reinforcement layer 6 is embedded in the insulating layer 4, and the remaining portion of the reinforcement layer 6 is embedded in the jacket 5. The reinforcement layer 6 can be understood as a fused layer between the jacket 5 and the insulating layer 4. For example, the jacket 5 is a layer of PVC material, while the insulating layer 4 is a layer of polyethylene material. The extrusion temperature of the jacket 5 is higher than that of the insulating layer 4. For example, the extrusion temperature of the jacket 5 is 190°C, while the extrusion temperature of the insulating layer 4 is 145°C, so that the reinforcement layer 6 is formed on the outer circumference of the insulating layer 4.

[0050] The preparation process of this embodiment is as follows:

[0051] S1. Straighten at least a portion of the core 1, then strand the intermediate aluminum alloy wires 20 in a first stranding direction; simultaneously, strand the outer aluminum alloy wires 30 outside the intermediate aluminum alloy wires 20 in a second stranding direction to produce a special-shaped aluminum conductor;

[0052] S2, extruding an insulating layer 4 on the outer peripheral surface of the special-shaped aluminum conductor;

[0053] S3. Extruding a sheath 5 on the outer peripheral surface of the insulating layer 4 to obtain a cable.

[0054] A braided sleeve 7 is woven on the outer wall of the insulating layer 4. The braided sleeve 7 has a diamond-shaped woven mesh, and the braided sleeve 7 is embedded in the reinforcement layer 6. The braided sleeve 7 is, for example, a glass fiber material. Part of the material of the reinforcement layer 6 passes through the diamond-shaped woven mesh. At this time, further structural reinforcement is formed in the reinforcement layer 6. The mesh of the braided sleeve 7 is, for example, between 1mm and 5mm. That is, before the sheath 5 is extruded, the braided sleeve 7 is woven on the outer peripheral surface of the insulating layer 4. When the sheath 5 is extruded, the extruded material of the sheath 5 enters the woven mesh of the braided sleeve 7 due to the extrusion pressure. Then, since the extrusion temperature of the sheath 5 is higher than the extrusion temperature of the insulating layer 4, the braided sleeve 7 can be embedded in the reinforcement layer 6. This structural design can strengthen the protection of the insulating layer 4 to prevent leakage.

[0055] Secondly, the braided sleeve 7 is directly woven in a hot state after the insulating layer 4 is extruded. The advantage of this process is that the braided sleeve 7 can form a radial material constraint on the insulating layer 4. At the same time, the inner diameter of the braided sleeve 7 is smaller than the outer diameter of the insulating layer 4. At this time, at least part of the wall thickness of the braided sleeve 7 can be embedded in the insulating layer 4. When the sheath 5 is further extruded, at least part of the material of the sheath 5 enters the woven mesh. In this state, the roundness of the insulating layer 4 can be guaranteed. At the same time, the material of the insulating layer 4 entering the woven mesh of the braided sleeve 7 and the material of the sheath 5 entering the woven mesh of the braided sleeve 7 form a state similar to hot melting, so as to further improve the connection strength between the insulating layer 4 and the sheath 5, that is, at least part of the braided sleeve 7 is embedded in the insulating layer 4, and the remaining part is embedded in the sheath 5.

[0056] Table 1:

[0057]

[0058] As can be seen from Table 1 above, the roundness of this embodiment is superior to the detection reference value. "○" is the roundness symbol.

[0059] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

Claims

1. A special-shaped aluminum conductor, comprising a core (1), an intermediate stranded wire layer (2) having a circular cross-section is provided on the periphery of the core (1) in a first stranding direction, and an outer stranded wire layer (3) having a circular cross-section is provided on the periphery of the intermediate stranded wire layer (2) in a second stranding direction, the intermediate stranded wire layer (2) comprising a plurality of intermediate aluminum alloy wires (20) having a tile-shaped cross-section, and the outer stranded wire layer (3) comprising a plurality of outer aluminum alloy wires (30) having a tile-shaped cross-section, characterized in that: A first internal decompression space (21) inclined in the first twisting direction is formed between the inner corners of two adjacent middle aluminum alloy wires (20), and at least part of the side surfaces of the two adjacent middle aluminum alloy wires (20) coincide with each other; a second internal decompression space (31) inclined in the second twisting direction is formed between the inner corners of two adjacent outer aluminum alloy wires (30), and at least part of the side surfaces of the two adjacent outer aluminum alloy wires (30) coincide with each other; The intermediate aluminum alloy wire (20) has a first contact side surface (200) and a second contact side surface (201), and the inner side of the intermediate aluminum alloy wire (20) has two corners, one of which is provided with a first small arc chamfer (23), and the other is provided with a first large arc chamfer (24); The first contact side surface (200) and the second contact side surface (201) of two adjacent intermediate aluminum alloy wires (20) are aligned and the first large arc chamfer (24) is tangent to the first contact side surface (200); and the adjacent first large arc chamfer (24) and the first small arc chamfer (23) are enclosed with the corresponding first contact side surface (200) to form the first internal decompression space (21) inclined according to the first strand direction; the surface area of ​​the second contact side surface (201) is smaller than the surface area of ​​the first contact side surface (200); The outer aluminum alloy wire (30) has two symmetrically distributed third contact side surfaces (300), and the inner side of each outer aluminum alloy wire (30) has two corners, wherein a second small rounded corner (33) is provided at the corner of one of the outer aluminum alloy wires (30), and a second large rounded corner (34) is provided at the corner of the other outer aluminum alloy wire (30); The second large rounded corner (34) is tangent to one of the adjacent third contact side surfaces (300), and the adjacent second small rounded corner (33) and the second large rounded corner (34) are enclosed with one of the corresponding third contact side surfaces (300) to form the second inner decompression space (31) inclined according to the second strand direction; A first outer decompression space (22) is formed between the outer corners of two adjacent intermediate aluminum alloy wires (20), and the radial depth of the first outer decompression space (22) in the intermediate stranded wire layer (2) is smaller than the radial depth of the first inner decompression space (21); A second outer decompression space (32) is formed between the outer corners of two adjacent outer aluminum alloy wires (30), and the radial depth of the second outer decompression space (32) in the outer stranded wire layer (3) is smaller than the radial depth of the second inner decompression space (31).

2. The special-shaped aluminum conductor according to claim 1, characterized in that: A first contact side surface (200) of the intermediate aluminum alloy wire (20) and the center of the intermediate aluminum alloy wire (20) form a first angle (25), and a second contact side surface (201) of the intermediate aluminum alloy wire (20) and the center of the intermediate aluminum alloy wire (20) form a second angle (26), and the first angle (25) is smaller than the second angle (26), so that a side of the intermediate aluminum alloy wire (20) close to the second contact side surface (201) has an asymmetric wedge-shaped portion (27).

3. The special-shaped aluminum conductor according to any one of claims 1 to 2, characterized in that: The first internal decompression space (21) and the second internal decompression space (31) are both triangular in shape.

4. Cable, characterized in that The cable comprises the special-shaped aluminum conductor according to any one of claims 1 to 3.

5. The cable according to claim 4, characterized in that The cable further comprises an insulating layer (4) extruded on the outer peripheral surface of the special-shaped aluminum conductor, wherein the insulating layer (4) has an embedded portion (40) embedded between the outer corners of two adjacent outer aluminum alloy wires (30).

6. The cable according to claim 5, characterized in that A sheath (5) is extruded on the outer peripheral surface of the insulating layer (4), and a reinforcement layer (6) is provided between the outer peripheral surface of the insulating layer (4) and the inner wall of the sheath (5), at least a portion of the reinforcement layer (6) is embedded in the insulating layer (4), and the remaining portion of the reinforcement layer (6) is embedded in the sheath (5).

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