Wind turbine tower and wind turbine

Abstract

The utility model provides a kind of wind power tower drum and wind power tower, including the straight tower drum section of constant inner diameter and the variable-diameter tower drum section being set above straight tower drum section, the inner diameter of the part of variable-diameter tower drum section close to straight tower drum section is less than the inner diameter of the part of variable-diameter tower drum section away from straight tower drum section;Variable-diameter tower drum section's inner circumferential wall has vertical section and variable-diameter section, which extends along the axial direction of variable-diameter tower drum section, the inner diameter of variable-diameter tower drum section at vertical section is constant, the inner diameter at vertical section is less than the inner diameter at variable-diameter section, vertical section is used to resist prestressed cable, prestressed cable is bent from the inclined extension of variable-diameter section to vertical extension at the connection of vertical section and variable-diameter section.The wind power tower drum and wind power tower provided by the utility model can reduce the bending angle of prestressed cable, thereby reducing the stress and friction loss of the bent part of prestressed cable, and reducing or even avoiding the possibility of prestressed cable fracture or local damage of wind power tower drum, thereby improving the structural safety and service life of wind power tower drum.

Description

Technical Field

[0001] This utility model relates to the field of wind power generation technology, specifically to a wind turbine tower and a wind turbine tower. Background Technology

[0002] A wind turbine tower may include a conical section and a straight section. The straight section may be located above the conical section. The inner and outer diameters of the conical section may gradually decrease from bottom to top, while the inner and outer diameters of the straight section may remain constant from bottom to top. Prestressed cables may be installed on the inner side of the inner circumferential wall of the wind turbine tower. These prestressed cables may extend from the bottom to the top of the wind turbine tower and be anchored at both the bottom and top to apply prestress to the tower.

[0003] In related technologies, the prestressed cable extends obliquely from bottom to top in the section corresponding to the conical section, then abuts against the inner wall of the tower at the connection between the conical and straight sections and bends, before extending vertically in the section corresponding to the straight section. However, in these technologies, the bending angle of the prestressed cable at the connection between the conical and straight sections is relatively large, leading to stress concentration and significant frictional loss in the bent portion of the prestressed cable. This may cause the prestressed cable to break or result in localized damage to the wind turbine tower, thereby seriously affecting the structural safety and service life of the wind turbine tower. Utility Model Content

[0004] This utility model aims to at least partially solve one of the technical problems in the related art.

[0005] Therefore, this utility model proposes a wind turbine tower and a wind turbine tower using the wind turbine tower.

[0006] The wind turbine tower proposed in this utility model includes: The tower section consists of a straight tower section and a variable diameter tower section. The straight tower section is positioned above the variable diameter tower section. The inner diameter of the straight tower section remains constant. The inner diameter of the portion of the variable diameter tower section closer to the straight tower section is smaller than the inner diameter of the portion of the variable diameter tower section farther from the straight tower section. The inner circumferential wall of the variable diameter tower section has a vertical section and a variable diameter section. Both the vertical section and the variable diameter section extend along the axial direction of the variable diameter tower section. The inner diameter of the variable diameter tower section at the vertical section remains unchanged, and the inner diameter of the variable diameter tower section at the vertical section is smaller than the inner diameter of the variable diameter tower section at the variable diameter section. The vertical section is used to abut against the prestressed cable. At the connection between the vertical section and the variable diameter section, the prestressed cable bends from an inclined extension of the variable diameter section to a vertical extension.

[0007] The wind turbine tower proposed in this utility model, by designing the inner circumferential wall of the variable-diameter tower section to include a vertical section and a variable-diameter section, allows the prestressed cable to bend from its inclined extension in the variable-diameter section to a vertical extension at the connection between the vertical and variable-diameter sections, and to abut against the vertical section. In other words, the prestressed cable can be bent in the variable-diameter tower section, causing the bending point of the prestressed cable to move downward, thereby reducing the bending angle of the prestressed cable. This reduces the stress and friction loss in the bent part of the prestressed cable, lowers or even avoids the possibility of prestressed cable breakage or local damage to the wind turbine tower, and thus improves the structural safety and service life of the wind turbine tower.

[0008] Optionally, the variable diameter section is inclined relative to the axial direction of the variable diameter tower section, and the angle between the axial direction of the variable diameter section and the axial direction of the variable diameter tower section is greater than the angle between the inclined extension portion of the prestressed cable and the axial direction of the variable diameter tower section.

[0009] Optionally, the angle between the axial direction of the variable diameter section and the variable diameter tower section is in the range of 1° to 2°, and / or the angle between the inclined extension portion of the prestressed cable and the axial direction of the variable diameter tower section is in the range of 1° to 2°.

[0010] Optionally, the inner diameter of the variable-diameter tower section in the vertical section is smaller than the inner diameter of the straight tower section.

[0011] Optionally, the vertical section is provided with a smooth and wear-resistant contact layer, which is used to contact the prestressed cable.

[0012] Optionally, the wind turbine tower further includes a top anchoring section, which is located above the straight tower section. The top anchoring section is provided with a first anchor hole, which is used for the prestressed cable to pass through or for the top anchoring of the prestressed cable. And / or, the wind turbine tower further includes a top anchoring section and a middle anchoring section, the prestressed cable includes a first prestressed sub-cable and a second prestressed sub-cable, the top anchoring section is located above the straight tower section, the top anchoring section is provided with a second anchor hole, the middle anchoring section is located between the straight tower section and the variable diameter tower section, the middle anchoring section is provided with a third anchor hole and a fourth anchor hole, the second anchor hole is used for the first prestressed sub-cable to pass through or for the top anchoring of the first prestressed sub-cable, the third anchor hole is used for the first prestressed sub-cable to pass through, and the fourth anchor hole is used for the top anchoring of the second prestressed sub-cable.

[0013] Optionally, both the first prestressed sub-cable and the second prestressed sub-cable abut against the vertical section.

[0014] Optionally, the number of the second anchor holes is less than the sum of the number of the third anchor holes and the fourth anchor holes.

[0015] Optionally, the wind turbine tower further includes a transition section, which is disposed above the top anchoring section. The wind turbine tower is connected to the wind turbine through the transition section. The top anchoring section is also provided with a connecting component, which is connected to the transition section through the connecting component. The connecting component is correspondingly disposed with the fourth anchor hole.

[0016] The wind turbine tower proposed in this utility model includes the wind turbine tower cylinder as described in this utility model.

[0017] The wind turbine tower proposed in this utility model can reduce the bending angle of the prestressed cable, thereby reducing the stress and friction loss of the prestressed cable bending part, reducing or even avoiding the possibility of prestressed cable breakage or local damage to the wind turbine tower, and thus improving the structural safety and service life of the wind turbine tower. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the variable diameter tower section of the wind turbine tower according to an embodiment of the present utility model; Figure 2 This is a partial schematic diagram of the wind turbine tower according to an embodiment of the present utility model; Figure 3 This is a schematic diagram of the top anchoring section of the wind turbine tower according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the middle anchoring section of the wind turbine tower according to an embodiment of the present utility model; Figure 5 This is a schematic diagram of one embodiment of the wind turbine tower of this utility model; Figure 6 This is a schematic diagram of another embodiment of the wind turbine tower of this utility model.

[0019] Figure label: 1. Straight tower section; 2. Variable diameter tower section; 21. Vertical section; 22. Variable diameter section; 23. Smooth wear-resistant contact layer; 3. Prestressed cable; 4. Top anchoring section; 41. First anchor hole; 42. Second anchor hole; 43. Connecting component; 5. Middle anchoring section; 51. Third anchor hole; 52. Fourth anchor hole; 6. Transition section. Detailed Implementation

[0020] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0021] The following is for reference. Figures 1-6This invention describes a wind turbine tower and a wind turbine tower according to embodiments of the present invention.

[0022] like Figures 1-6 As shown, the wind turbine tower of this embodiment includes a straight tower section 1 and a variable diameter tower section 2. The straight tower section 1 is disposed above the variable diameter tower section 2.

[0023] In practical applications, the straight tower section 1 can be set directly above the variable diameter tower section 2, or a transition section can be set above the variable diameter tower section 2 first, and then the straight tower section 1 can be set above the transition section. That is to say, the straight tower section 1 and the variable diameter tower section 2 can be directly connected, or they can be connected through a transition section set between the straight tower section 1 and the variable diameter tower section 2.

[0024] like Figure 2 , Figure 5 and Figure 6 As shown, the inner diameter of the straight tower section 1 remains unchanged. The inner diameter of the portion of the variable-diameter tower section 2 closest to the straight tower section 1 is smaller than the inner diameter of the portion of the variable-diameter tower section 2 furthest from the straight tower section 1.

[0025] In other words, the inner diameter of the straight tower section 1 is constant, while the inner diameter of the variable-diameter tower section 2 is variable, and the smaller the inner diameter of the variable-diameter tower section 2, the closer it is to the straight tower section 1.

[0026] In practical applications, the outer diameter of the portion of the variable-diameter tower section 2 closest to the straight tower section 1 is smaller than the outer diameter of the portion of the variable-diameter tower section 2 furthest from the straight tower section 1. In other words, the outer diameter of the variable-diameter tower section 2 is variable, and the smaller the outer diameter of the variable-diameter tower section 2, the closer it is to the straight tower section 1.

[0027] Optionally, the outer diameter of the variable-diameter tower section 2 can gradually decrease. That is, the outer peripheral wall of the variable-diameter tower section 2 can be conical, with the end with the smallest outer diameter being closest to the straight tower section 1 and the end with the largest outer diameter being furthest from the straight tower section 1.

[0028] like Figure 1 and Figure 2 As shown, the inner circumferential wall of the variable diameter tower section 2 has a vertical section 21 and a variable diameter section 22, both of which are along the axial direction of the variable diameter tower section 2 (e.g., ...). Figure 1 and Figure 2 The variable diameter tower section 2 extends in the vertical direction shown, and the inner diameter of the variable diameter tower section 2 at the vertical section 21 remains unchanged, and the inner diameter of the variable diameter tower section at the vertical section is smaller than the inner diameter of the variable diameter tower section 2 at the variable diameter section 22.

[0029] In other words, the vertical section 21 and the variable diameter section 22 are two sections of the inner circumferential wall of the variable diameter tower section 2 along the axial direction of the variable diameter tower section 2, with the vertical section 21 located above the variable diameter section 22. The vertical section 21 is adjacent to the straight tower section 1 relative to the variable diameter section 22, and is closer to the axis of the variable diameter tower section 2 relative to the variable diameter section 22. The inner diameter of the variable diameter tower section 2 in the vertical section 21 is constant, while the inner diameter of the variable diameter tower section 2 in the variable diameter section 22 can vary.

[0030] Optionally, the outer diameter of the variable-diameter tower section 2 can gradually decrease in the vertical section 21. That is, the outer peripheral wall of the variable-diameter tower section 2 in the vertical section 21 can be conical, with the end with the smallest outer diameter being closest to the straight tower section 1 and the end with the largest outer diameter being furthest from the straight tower section 1.

[0031] In practical applications, the inner diameter of the variable-diameter tower section 22 can gradually decrease. That is to say, the variable-diameter section 22 of the inner circumferential wall of the variable-diameter tower section 2 can be conical, with the end with the smallest outer diameter being closest to the straight tower section 1 and the end with the largest outer diameter being furthest from the straight tower section 1.

[0032] Optionally, the outer diameter of the variable-diameter tower section 22 can gradually decrease. That is, the outer peripheral wall of the variable-diameter tower section 22 can be conical, with the end with the smallest outer diameter being closest to the straight tower section 1 and the end with the largest outer diameter being furthest from the straight tower section 1.

[0033] like Figure 2 As shown, the vertical section 21 is used to abut against the prestressed cable 3. At the connection between the vertical section 21 and the variable diameter section 22, the prestressed cable 3 is bent into a vertical extension by the inclined extension of the variable diameter section 22.

[0034] In practical applications, below the connection between the vertical section 21 and the variable diameter section 22, the prestressed cable 3 can extend obliquely and optionally gradually approach the axis of the variable diameter tower section 2 from bottom to top; at the connection between the vertical section 21 and the variable diameter section 22, the prestressed cable 3 can abut against the connection between the vertical section 21 and the variable diameter section 22, thereby bending and changing from oblique extension to vertical extension; above the connection between the vertical section 21 and the variable diameter section 22, the prestressed cable 3 can abut against the vertical section and can maintain vertical extension.

[0035] The wind turbine tower proposed in this embodiment of the invention, by designing the inner peripheral wall of the variable diameter tower section 2 to include a vertical section 21 and a variable diameter section 22, allows the prestressed cable 3 to bend from its inclined extension of the variable diameter section 22 to a vertical extension at the connection between the vertical section 21 and the variable diameter section 22, and to abut against the vertical section 21. In other words, the prestressed cable 3 can be bent at the variable diameter tower section 2, causing the bending point of the prestressed cable 3 to move downward, thereby reducing the bending angle of the prestressed cable 3. This reduces the stress and friction loss of the bent part of the prestressed cable 3, reduces or even avoids the possibility of the prestressed cable 3 breaking or the wind turbine tower being partially damaged, and thus improves the structural safety and service life of the wind turbine tower.

[0036] like Figure 2 As shown, in one embodiment of this utility model, the variable diameter section 22 can be inclined relative to the axial direction of the variable diameter tower section 2, and the axial direction of the variable diameter section 22 and the variable diameter tower section 2 (e.g., ...) Figure 2 The angle α between the inclined extension of the prestressed cable 3 and the axial direction of the variable-diameter tower section 2 can be greater than the angle β between the inclined extension of the prestressed cable 3 and the axial direction of the variable-diameter tower section 2.

[0037] In other words, relative to Figure 2 In the vertical direction shown, the diameter-changing section 22 of the inner circumferential wall of the variable-diameter tower section 2 can be inclined, and the degree of inclination of the inclined extension of the prestressed cable 3 can be less than the degree of inclination of the diameter-changing section 22. This design allows the inclined extension of the prestressed cable 3 to have a smaller inclination angle, thereby making the bending angle of the prestressed cable 3 from inclined extension to vertical extension smaller.

[0038] In practical applications, the prestressed cable 3 can be placed inside the cylinder of the variable diameter tower section 2. That is, the prestressed cable 3 is placed close to the axis of the variable diameter tower section 2 relative to the inner circumferential wall of the variable diameter tower section 2. This makes the bottom of the inclined extension of the prestressed cable 3 close to the axis of the variable diameter tower section 2 relative to the bottom of the variable diameter section 22, and there is a gap between them. The top of the inclined extension of the prestressed cable 3 contacts the connection between the variable diameter section 22 and the vertical section 21. This makes the inclination of the inclined extension of the prestressed cable 3 less than that of the variable diameter section 22.

[0039] Optionally, the prestressed cable 3 can be an internal prestressed cable.

[0040] like Figure 2 As shown, in one embodiment of this utility model, the included angle α between the axial direction of the variable diameter section 22 and the variable diameter tower section 2 can be in the range of 1° to 2°, and / or, the included angle β between the inclined extension portion of the prestressed cable 3 and the axial direction of the variable diameter tower section 2 can be in the range of 1° to 2°.

[0041] In related technologies, the bottom of the prestressed cable 3 can be anchored to the tower foundation located below the wind turbine tower. The distance between the bottom of the prestressed cable 3 and the inner circumferential wall of the bottom of the wind turbine tower cannot be too large. In other words, the bottom of the prestressed cable 3 cannot be too far from the inner circumferential wall of the bottom of the wind turbine tower. If the distance is too far from the inner circumferential wall of the bottom of the wind turbine tower, the prestressed cable 3 will be located in the middle of the bracket of the tower foundation used for anchoring the prestressed cable 3. On the one hand, this will lead to an increase in the bending moment of the tower foundation, resulting in an increase in the stress on the tower foundation. On the other hand, it will lead to the anchoring structure of the prestressed cable 3 occupying the space for the placement of other equipment. Therefore, in related technologies, the radial distance between the bottom anchoring point and the top anchoring point of the prestressed cable 3 is relatively large, resulting in an excessively large bending and turning angle of the prestressed cable 3.

[0042] In this embodiment of the wind turbine tower, by designing the axial angle α between the variable diameter section 22 and the variable diameter tower section 2 to be in the range of 1° to 2°, or by designing the axial angle β between the inclined extension portion of the prestressed cable 3 and the axial direction of the variable diameter tower section 2 to be in the range of 1° to 2°, the inclination angle of the inclined extension portion of the prestressed cable 3 can be reduced, thereby reducing the bending angle of the prestressed cable 3 from inclined extension to vertical extension. By designing the axial angle α between the variable diameter section 22 and the variable diameter tower section 2 to be in the range of 1° to 2°, and the axial angle β between the inclined extension portion of the prestressed cable 3 and the axial direction of the variable diameter tower section 2 to be in the range of 1° to 2°, the inclination angle of the inclined extension portion of the prestressed cable 3 can be reduced without changing the distance between the bottom of the prestressed cable 3 and the inner circumferential wall of the bottom of the wind turbine tower, thereby reducing the inclination angle of the inclined extension portion of the prestressed cable 3 without changing the stress condition of the tower foundation.

[0043] like Figure 2 As shown, in one embodiment of this utility model, the inner diameter of the variable diameter tower section 2 at the vertical section 21 can be smaller than the inner diameter of the straight tower section 1.

[0044] In other words, the vertical section 21 is closer to the axis of the wind turbine tower than the inner circumferential wall of the straight tower section 1. This design allows for a gap between the vertically extending part of the prestressed cable 3 and the inner circumferential wall of the straight tower section 1, thereby preventing the vertically extending part of the prestressed cable 3 from being worn or even broken due to contact with the inner circumferential wall of the straight tower section 1.

[0045] like Figure 2 As shown, in one embodiment of this utility model, the vertical section 21 may be provided with a smooth and wear-resistant contact layer 23, which is used to contact the prestressed cable 3.

[0046] Compared to direct contact between the prestressed cable 3 and the vertical section 21, the contact between the smooth and wear-resistant contact layer 23 and the prestressed cable 3 can reduce frictional loss, wear and heat accumulation, and thus prevent the prestressed cable 3 from breaking.

[0047] Optionally, the material of the smooth and wear-resistant contact layer 23 may be polyurethane (abbreviated as PU).

[0048] Optionally, the smooth, wear-resistant contact layer 23 can be a polyurethane board.

[0049] Optionally, the smooth, wear-resistant contact layer 23 can be connected to the vertical section 21 by means of bolts or other fasteners.

[0050] like Figure 5 and Figure 6 As shown, in one embodiment of this utility model, the wind turbine tower may further include a top anchoring section 4, which is disposed above the straight tower section 1.

[0051] In practical applications, the number of straight tower sections 1 between the top anchoring section 4 and the variable diameter tower section 2 can be one or more.

[0052] The top anchoring section 4 is provided with a first anchor hole 41. The first anchor hole 41 can be selected to penetrate the top anchoring section 4 in a vertical direction. The first anchor hole 41 is used for the prestressed cable 3 to pass through or for the top anchoring of the prestressed cable 3.

[0053] In practical applications, the top of the prestressed cable 3 can be directly anchored to the first anchor hole 41 of the top anchoring section 4, or it can pass through the first anchor hole 41 and be anchored to the remaining components above the top anchoring section 4. This allows the prestressed cable 3 to be tensioned to apply prestress to all sections of the wind turbine tower and connect all sections of the wind turbine tower, thereby ensuring the stability of the wind turbine tower.

[0054] However, the anchoring method of prestressed cable 3 is not limited to this.

[0055] like Figure 3 , Figure 4 and Figure 6 As shown, in another embodiment of this utility model, the wind turbine tower may include a top anchoring section 4 and a middle anchoring section 5, and the prestressed cable 3 may include a first prestressed sub-cable and a second prestressed sub-cable.

[0056] The top anchoring section 4 is located above the straight tower section 1. The top anchoring section 4 is provided with a second anchor hole 42, which can be selected to penetrate the top anchoring section 4 in a vertical direction.

[0057] The middle anchoring section 5 is located between the straight tower section 1 and the variable-diameter tower section 2. The number of straight tower sections 1 between the middle anchoring section 5 and the top anchoring section 4 can be one or more. The middle anchoring section 5 is provided with a third anchor hole 51 and a fourth anchor hole 52. The third anchor hole 51 and the fourth anchor hole 52 can be selected to penetrate the middle anchoring section 5 vertically and be arranged circumferentially along the middle anchoring section 5.

[0058] The second anchor hole 42 is used for the first prestressed sub-song to pass through or for the top of the first prestressed sub-song to be anchored. The third anchor hole 51 is used for the first prestressed sub-song to pass through. The fourth anchor hole 52 is used for the top of the second prestressed sub-song to be anchored.

[0059] In practical applications, the height of wind turbine towers can be very high, potentially posing safety hazards to tower crane operations. Therefore, the middle anchorage section 5 and the tower section below it can be constructed first. The top of the second prestressed sub-cable is anchored at the fourth anchor hole 52 of the middle anchorage section 5. This allows prestress to be applied to the middle anchorage section 5 and the tower section below it by tensioning the second prestressed sub-cable, connecting the middle anchorage section 5 and the tower section below it, thus ensuring the stability of the middle anchorage section 5 and the tower section below it. Subsequently, the tower crane can be connected to the middle anchorage section 5 and the tower section below it, using the middle anchorage section 5 and the tower section below it for support, thereby reducing or even eliminating safety hazards during tower crane operations. Afterward, the tower crane can continue to lift the tower section above the middle anchorage section 5 to continue constructing the tower section and the top anchorage section 4 above the middle anchorage section 5. The first prestressed sub-cable can pass through the third anchor hole 51, and the top of the first prestressed sub-cable can be directly anchored to the second anchor hole 42 of the top anchoring section 4, or it can pass through the second anchor hole 42 and be anchored to the remaining components above the top anchoring section 4. This allows prestress to be applied to all sections of the wind turbine tower by tensioning the first prestressed sub-cable, and all sections of the wind turbine tower can be connected, thereby ensuring the stability of the wind turbine tower. In this way, by tensioning the first and second prestressed sub-cables twice to apply prestress to all sections of the wind turbine tower and connecting all sections of the wind turbine tower, the prestress loss of a single tensioning can be reduced compared to tensioning only once. Under the premise of ensuring the stability of the wind turbine tower, the amount of prestressed cable 3 can be reduced (for example, the second prestressed sub-cable does not need to be extended to the top anchoring section 4, and the length of the second prestressed sub-cable is reduced). In addition, the construction process of tensioning twice has a longer pre-tensioning force than the construction process of tensioning once, so as to improve the service life of the wind turbine tower.

[0060] Optionally, the inner and outer diameters of the top anchoring section 4 can remain unchanged.

[0061] Optionally, the inner and outer diameters of the middle anchoring section 5 can remain unchanged.

[0062] like Figure 2 As shown, in one embodiment of this utility model, the first prestressed sub-cable and the second prestressed sub-cable can both abut against the vertical section 21.

[0063] This design reduces the bending angle of the first and second prestressed cables, thereby reducing stress and frictional losses at the bending points. This lowers or even eliminates the possibility of breakage of the first and second prestressed cables or localized damage to the wind turbine tower, ultimately improving the structural safety and service life of the wind turbine tower. Because the middle anchorage section 5 requires both anchorage of the second prestressed sub-cable and passage of the first prestressed sub-cable, while the top anchorage section 4 does not require passage or anchorage of the second prestressed sub-cable, therefore, as Figure 2 As shown, in one embodiment of this utility model, the number of second anchor holes 42 may be less than the sum of the number of third anchor holes 51 and fourth anchor holes 52.

[0064] Alternatively, the number of second anchor holes 42 can be the same as the number of third anchor holes 51 to simplify the processing of the top anchoring section 4.

[0065] like Figure 5 and Figure 6 As shown, in one embodiment of this utility model, the wind turbine tower may further include a transition section 6, which is disposed above the top anchoring section 4. The wind turbine tower is connected to the wind turbine through the transition section 6. The top anchoring section 4 may also be provided with a connecting component 43, which is connected to the transition section 6. The connecting component 43 is correspondingly disposed with the fourth anchor hole 52.

[0066] In other words, the portion of the top anchoring section 4 located above the fourth anchor hole 52 is equipped with a connecting component 43. Due to the two tensioning processes of the first and second prestressed sub-cables, the number of second anchor holes 42 can be less than the sum of the number of third and fourth anchor holes 51. Therefore, the space of the top anchoring section 4 can be fully utilized to set up the connecting component 43, thereby increasing the number of connecting components 43 set in the top anchoring section 4 and improving the connection stability between the top anchoring section 4 and the transition section 6. In practical applications, if the first prestressed sub-cable passes through the second anchor hole 42 but is not anchored to the top anchoring section 4, it can pass through the transition section 6 and be anchored to the transition section 6.

[0067] Optionally, transition section 6 can be a steel tower section.

[0068] Optionally, the connecting part 43 can be anchored.

[0069] like Figures 1-6 As shown, the wind turbine tower proposed in this embodiment of the present invention includes the wind turbine tower cylinder as proposed in this embodiment of the present invention.

[0070] The wind turbine tower proposed in this embodiment of the present invention can reduce the bending angle of the prestressed cable, thereby reducing the stress and friction loss of the bent part of the prestressed cable, reducing or even avoiding the possibility of prestressed cable breakage or local damage to the wind turbine tower, and thus improving the structural safety and service life of the wind turbine tower.

[0071] Optionally, the wind turbine tower may also include a tower foundation located below the wind turbine tower.

[0072] Optionally, the wind turbine tower may also include a wind turbine generator, which is positioned above the wind turbine tower.

[0073] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0074] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0075] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0076] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0077] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0078] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A wind turbine tower, characterized in that, It includes a straight tower section and a variable diameter tower section. The straight tower section is located above the variable diameter tower section. The inner diameter of the straight tower section remains unchanged. The inner diameter of the portion of the variable diameter tower section closer to the straight tower section is smaller than the inner diameter of the portion of the variable diameter tower section farther from the straight tower section. The inner circumferential wall of the variable diameter tower section has a vertical section and a variable diameter section. Both the vertical section and the variable diameter section extend along the axial direction of the variable diameter tower section. The inner diameter of the variable diameter tower section at the vertical section remains unchanged, and the inner diameter of the variable diameter tower section at the vertical section is smaller than the inner diameter of the variable diameter tower section at the variable diameter section. The vertical section is used to abut against the prestressed cable. At the connection between the vertical section and the variable diameter section, the prestressed cable bends from an inclined extension of the variable diameter section to a vertical extension.

2. The wind turbine tower according to claim 1, characterized in that, The variable diameter section is inclined relative to the axial direction of the variable diameter tower section, and the angle between the axial direction of the variable diameter section and the axial direction of the variable diameter tower section is greater than the angle between the inclined extension of the prestressed cable and the axial direction of the variable diameter tower section.

3. The wind turbine tower according to claim 1, characterized in that, The angle between the axial direction of the variable diameter section and the axial direction of the variable diameter tower section is in the range of 1° to 2°, and / or the angle between the inclined extension portion of the prestressed cable and the axial direction of the variable diameter tower section is in the range of 1° to 2°.

4. The wind turbine tower according to claim 1, characterized in that, The inner diameter of the variable-diameter tower section in the vertical section is smaller than the inner diameter of the straight tower section.

5. The wind turbine tower according to claim 1, characterized in that, The vertical section is provided with a smooth and wear-resistant contact layer, which is used to contact the prestressed cable.

6. The wind turbine tower according to claim 1, characterized in that, The wind turbine tower also includes a top anchoring section, which is located above the straight tower section. The top anchoring section is provided with a first anchor hole, which is used for the prestressed cable to pass through or for the top anchoring of the prestressed cable. And / or, the wind turbine tower further includes a top anchoring section and a middle anchoring section, the prestressed cable includes a first prestressed sub-cable and a second prestressed sub-cable, the top anchoring section is located above the straight tower section, the top anchoring section is provided with a second anchor hole, the middle anchoring section is located between the straight tower section and the variable diameter tower section, the middle anchoring section is provided with a third anchor hole and a fourth anchor hole, the second anchor hole is used for the first prestressed sub-cable to pass through or for the top anchoring of the first prestressed sub-cable, the third anchor hole is used for the first prestressed sub-cable to pass through, and the fourth anchor hole is used for the top anchoring of the second prestressed sub-cable.

7. The wind turbine tower according to claim 6, characterized in that, Both the first prestressed sub-cable and the second prestressed sub-cable abut against the vertical section.

8. The wind turbine tower according to claim 6, characterized in that, The number of the second anchor holes is less than the sum of the number of the third anchor holes and the fourth anchor holes.

9. The wind turbine tower according to claim 6, characterized in that, The wind turbine tower also includes a transition section, which is located above the top anchoring section. The wind turbine tower is connected to the wind turbine through the transition section. The top anchoring section is also provided with a connecting component, which is connected to the transition section through the connecting component. The connecting component is correspondingly provided with the fourth anchor hole.

10. A wind turbine tower, characterized in that, Including the wind turbine tower as described in any one of claims 1-9.

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