Lattice type fan tower

Abstract

The invention relates to the technical field of wind power, and discloses a lattice type fan tower which comprises a top tower section, a switching section and a lattice section, the top end of the switching section is fixed to the top tower section, and the top end of the lattice section is fixed to the switching section; the lattice section comprises a plurality of corner columns and a plurality of reinforcing pieces, all the corner columns define a corner column frame, and the top ends of all the corner columns are fixed to the switching section; the reinforcing pieces are connected to the two adjacent corner columns in the side edge direction of the corner column frame. Any corner column is provided with a corner column inflection point, and the corner column is bent towards the outer side of the corner column frame at the corner column inflection point. The height of the corner column inflection point is configured to be lower than or equal to the lowest height of the blade tip of the fan blade, it is guaranteed that the blade does not collide with the tower in the operation process, the taper of the lattice section below the corner column inflection point can be flexibly adjusted, the structural efficiency is higher, and the material consumption is smaller. And the frequency of the tower can be flexibly adjusted by adjusting the conicity of the lattice sections, so that the resonance interval of the fan is avoided, and the safety of the tower is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power, and in particular to a lattice wind turbine tower. Background Art

[0002] At present, the majority of wind turbine support structures use steel circular towers and steel-concrete mixed towers.

[0003] The overall stiffness of traditional steel circular towers is relatively low, which will induce adverse vibration characteristics of wind turbines. There are many structural constraints such as frequency crossing, vortex-induced vibration, buckling fatigue, etc., which lead to certain technical bottlenecks in its development towards higher cavitation.

[0004] Due to the limitations of concrete materials in tensile strength and ductility, when using existing steel-concrete hybrid towers to meet the hub height requirements of 180 meters and above, there will be problems such as great design difficulty, high material consumption, and poor torsional and seismic performance.

[0005] Therefore, there is an urgent engineering need to explore new wind power high tower technology routes to meet the needs of higher tower heights and larger rotor diameters. Summary of the invention

[0006] In view of this, the present invention provides a lattice wind turbine tower to solve the problems of difficult design, high material consumption, poor torsional and seismic performance when the existing steel-concrete hybrid tower is used to meet the hub height requirements of 180 meters and above.

[0007] In a first aspect, the present invention provides a lattice wind turbine tower, comprising:

[0008] A top tower section, the top of which is suitable for installing a wind turbine generator set;

[0009] A transition section, the top end of which is fixed to the top tower section;

[0010] a lattice segment, the top end of which is fixed to the transition segment, and the lattice segment is configured to support the top tower segment and the transition segment;

[0011] The lattice segment comprises:

[0012] A plurality of corner columns, all of which together form a corner column frame, and the top ends of all of the corner columns are fixed to the transition section;

[0013] A plurality of reinforcement members, all of which are connected to two adjacent corner columns along the side direction of the corner column frame;

[0014] Wherein, any of the corner columns is provided with a corner column inflection point, and the corner column is bent toward the outside of the corner column frame at the corner column inflection point;

[0015] The corner column inflection point height is configured to be lower than or equal to the lowest height of the blade tip in the wind turbine generator set.

[0016] By setting a corner column inflection point near the lowest position of the blade tip, the clearance limit can be flexibly adapted to ensure that the blade will not collide with the tower during operation, so that the taper of the lattice section below the corner column inflection point can be flexibly adjusted, making the structure more efficient and using less material. And by adjusting the taper of the lattice section, the tower frequency can be flexibly adjusted to avoid the resonance range of the wind turbine and ensure the safety of the tower.

[0017] In an optional embodiment, the lattice wind turbine tower further includes a prestressed reinforcement member, wherein the prestressed reinforcement member is fixed to the corner column and the prestressed reinforcement member passes through a corner column inflection point on the corner column.

[0018] Due to the large bending moment at the corner column inflection point, the concrete in the corner column inflection point repeatedly cracks during the operation of the wind turbine. The prestress of the steel strands inserted inside the corner column inflection point is not enough to control the cracks in the concrete. Therefore, prestressed threaded steel bars are used at the corner column inflection point to arrange a second prestress to control the cracking of the concrete and enhance the fatigue resistance of the concrete.

[0019] In an optional embodiment, the prestressed reinforcement member is a plurality of prestressed threaded steel bars arranged inside the inflection point of the corner column.

[0020] In an optional embodiment, the reinforcement member includes a plurality of diagonal braces, each of which is connected between two adjacent corner columns in the lateral direction of the corner column frame, and the plurality of diagonal braces at the same height between the two corner columns are intersected and fixed.

[0021] In an optional embodiment, the reinforcement member further includes a plurality of transverse braces, each of which is connected between two adjacent corner columns in the lateral direction of the corner column frame, and the transverse braces are fixed to some diagonal braces at the intersection of the diagonal braces.

[0022] In an optional embodiment, all the diagonal braces on the lower side of the inflection point of the corner column are connected to the transverse braces at the intersection.

[0023] The spacing between corner columns below the inflection point of the corner column is larger, resulting in a longer calculated length of the diagonal brace and corner column, poor stability, reduced bearing capacity of the component, and a larger cross-section is required to ensure its safety, which increases material consumption. Therefore, the cross brace can be fixed only on the corner column below the inflection point of the corner column.

[0024] In an optional embodiment, all the cross braces are placed horizontally, and the cross braces on any side of the corner column frame are at the same height as the cross braces on the other sides of the corner column frame to form a cross brace frame on the corner column frame.

[0025] In an optional embodiment, the corner column comprises:

[0026] Outer ring;

[0027] An inner ring, the inner ring is arranged inside the outer ring and concentric with the outer ring, and the space between the outer ring and the inner ring is filled with concrete;

[0028] The prestressed reinforcement member is arranged in the concrete at the corner point of the corner column.

[0029] In an optional embodiment, the lattice wind turbine tower further includes a wire splitter diverter, and the wire splitter diverter is arranged in the inner circle at the inflection point of the corner column.

[0030] The lattice wind turbine tower provided by the present invention has the following advantages:

[0031] 1. The present invention provides a lattice wind turbine tower, comprising a top tower section, a transition section and a lattice section, wherein the top end of the top tower section is suitable for installing a wind turbine set, the top end of the transition section is fixed to the top tower section, the top end of the lattice section is fixed to the transition section, and the lattice section is configured to support the top tower section and the transition section; the lattice section comprises a plurality of corner columns and a plurality of reinforcement members, all of the corner columns are enclosed to form a corner column frame, and the top ends of all the corner columns are fixed to the transition section; all of the reinforcement members are connected to two adjacent corner columns along the side direction of the corner column frame; wherein a corner column inflection point is provided on any of the corner columns, and the corner column is bent toward the outside of the corner column frame at the corner column inflection point; the height of the corner column inflection point is configured to be lower than or equal to the lowest height of the blade tip in the wind turbine set.

[0032] The lattice wind turbine tower of this structure can flexibly adapt to the clearance limit by setting a corner column inflection point near or below the lowest position of the blade tip, ensuring that the blade will not collide with the tower during operation, so that the taper of the lattice section below the corner column inflection point can be flexibly adjusted, making the structure more efficient and using less material. And by adjusting the taper of the lattice section, the tower frequency can be flexibly adjusted to avoid the resonance range of the wind turbine and ensure the safety of the tower.

[0033] 2. The present invention provides a lattice wind turbine tower, further comprising a prestressed reinforcement member, wherein the prestressed reinforcement member is fixed to the corner column and passes through the corner column inflection point on the corner column. Preferably, the prestressed reinforcement member is a plurality of prestressed threaded steel bars arranged inside the corner column inflection point.

[0034] The lattice wind turbine tower of this structure has a large bending moment at the corner column inflection point, which causes the concrete in the corner column inflection point to crack repeatedly during the operation of the wind turbine. The prestress of the steel strands inserted inside the corner column inflection point is not enough to control the cracks in the concrete. Therefore, prestressed threaded steel bars are used inside the corner column inflection point to arrange a second prestress to control the cracking of the concrete and enhance the fatigue resistance of the concrete.

[0035] 3. The present invention provides a lattice wind turbine tower, wherein the reinforcement member includes a plurality of diagonal braces, each of which is connected between two adjacent corner columns in the lateral direction of the corner column frame, and the plurality of diagonal braces at the same height between two corner columns are intersected and fixed. The reinforcement member also includes a plurality of transverse braces, each of which is connected between two adjacent corner columns in the lateral direction of the corner column frame, and the transverse braces are fixed to some of the diagonal braces at the intersection of the diagonal braces. All the diagonal braces below the inflection point of the corner column are connected to the transverse braces at the intersection.

[0036] For a lattice wind turbine tower of this structure, the spacing between corner columns below the inflection point of the corner columns is large, resulting in a long calculated length of the diagonal braces and corner columns, poor stability, reduced bearing capacity of the components, and a larger cross-section is required to ensure its safety, which increases material consumption. Therefore, the cross braces can be fixed only on the corner columns below the inflection point of the corner columns. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 A front view of a lattice wind turbine tower provided in an embodiment of the present invention;

[0039] Figure 2 A schematic structural diagram of a corner column in a lattice wind turbine tower provided in an embodiment of the present invention;

[0040] Figure 3 A cross-sectional view of a corner column inflection point in a lattice wind turbine tower provided in an embodiment of the present invention;

[0041] Figure 4 It is a schematic structural diagram of the inflection point of a corner column in a lattice wind turbine tower provided in an embodiment of the present invention.

[0042] Description of reference numerals:

[0043] 1- Top tower section;

[0044] 2-Transfer section;

[0045] 31-corner column; 32-corner column inflection point; 33-prestressed reinforcement; 34-diagonal brace; 35-horizontal brace; 36-outer ring; 37-inner ring;

[0046] 4-Wire dividing diverter;

[0047] 5- Wind turbines;

[0048] 6-Prestressed steel strand. DETAILED DESCRIPTION

[0049] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0051] Example

[0052] This embodiment provides a lattice wind turbine tower, such as Figures 1 to 4 As shown, it includes a top tower section 1, a transition section 2 and a lattice section. The top of the top tower section 1 is suitable for installing a wind turbine 5. The top of the transition section 2 is fixed to the top tower section 1, and the top of the lattice section is fixed to the transition section 2. The lattice section is configured to support the top tower section 1 and the transition section 2.

[0053] In this embodiment, the lattice segment includes four corner columns 31 and reinforcements. All corner columns 31 are enclosed to form a corner column frame. The top ends of all corner columns 31 are fixed to the transition segment 2. All reinforcements are connected to two adjacent corner columns 31 along the side direction of the corner column frame. A corner column inflection point 32 is provided on any corner column 31, and the corner column 31 is bent toward the outside of the corner column frame at the corner column inflection point 32. The height of the corner column inflection point 32 is configured to be lower than or equal to the lowest height of the blade tip in the wind turbine 5.

[0054] Specifically, four corner columns 31 are arranged in a rectangular shape to form a corner column frame, the top of the corner column 31 is fixed to the transition section 2, and the top of the transition section 2 is thereby fixed to the top tower section 1, all reinforcements are connected to two adjacent corner columns 31 along the side direction of the corner column frame, and the four corner columns 31 are fixed to each other by the reinforcements to improve the stability of the connection between the four corner columns 31.

[0055] In this embodiment, a reinforcement piece is fixedly connected only between two corner posts 31 on the sides of the rectangular corner post frame, and no reinforcement piece is provided between two corner posts 31 on the diagonal sides. If it is necessary to further improve the stability of the connection between the corner posts 31, a reinforcement piece may also be fixedly connected between two corner posts 31 on the diagonal sides.

[0056] In order to prevent the wind turbine blades from colliding with the tower during operation, the cross-sectional size of the tower is strictly limited within the rotation range of the impeller, which is called the clearance limit. Within a certain range, the larger the spacing between the lattice tower corner columns 31, the higher the structural force efficiency and the lower the cost.

[0057] Therefore, in this embodiment, Figure 1 As shown, in order to meet the clearance restriction, make the tower have better structural force efficiency and reduce the cost of the tower, a corner column inflection point 32 is provided on any corner column 31, and the corner column 31 is bent toward the outside of the corner column frame at the corner column inflection point 32; the height of the corner column inflection point 32 is configured to be lower than or equal to the lowest height of the blade tip in the wind turbine 5.

[0058] By setting a corner column inflection point 32 near the lowest position of the blade tip at the corner column 31, the clearance limit can be flexibly adapted to ensure that the blade will not collide with the tower during operation, so that the taper of the lattice section below the corner column inflection point 32 can be flexibly adjusted, making the structure more efficient and using less material. In addition, by adjusting the taper of the lattice section, the tower frequency can be flexibly adjusted to avoid the resonance range of the wind turbine and ensure the safety of the tower.

[0059] In this embodiment, if Figure 3 As shown, the lattice wind turbine tower further includes a prestressed reinforcement member 33, which is fixed to the corner column 31 and passes through the corner column inflection point 32 on the corner column 31. Specifically, the prestressed reinforcement member 33 is a plurality of prestressed threaded steel bars arranged inside the corner column 31, and all the prestressed threaded steel bars pass through the inside of the corner column inflection point 32.

[0060] In this embodiment, if Figure 2 and Figure 3As shown, the corner column 31 includes an outer ring 36 and an inner ring 37. The inner ring 37 is arranged inside the outer ring 36 and is arranged concentrically with the outer ring 36. Concrete is filled between the outer ring 36 and the inner ring 37. Since there is a large bending moment at the corner column inflection point 32, the concrete in the corner column inflection point 32 repeatedly cracks during the operation of the wind turbine. The prestress of the prestressed steel strand 6 passing through the corner column inflection point 32 is not enough to control the cracks of the concrete. Therefore, a prestressed reinforcement 33 is used inside the corner column inflection point 32 to arrange a second prestress to control the cracking of the concrete and enhance the fatigue resistance of the concrete.

[0061] In this embodiment, if Figure 1 As shown, the reinforcement includes a plurality of diagonal braces 34, and a plurality of diagonal braces 34 are connected between two adjacent corner columns 31 in the lateral direction of the corner column frame, and a plurality of diagonal braces 34 at the same height between two corner columns 31 are intersected and fixed.

[0062] In this embodiment, the reinforcement member further includes a plurality of transverse braces 35 . A plurality of transverse braces 35 are connected between two adjacent corner columns 31 in the lateral direction of the corner column frame, and the transverse braces 35 and part of the diagonal braces 34 are fixed at the intersection of the diagonal braces 34 .

[0063] A plurality of diagonal braces 34 are intersected and connected between two adjacent corner posts 31 in the lateral direction of the corner post frame to improve the stability of the connection between the corner posts 31. At the same time, a plurality of transverse braces 35 are connected between two adjacent corner posts 31 in the lateral direction of the corner post frame, and the transverse braces 35 are fixed to part of the diagonal braces 34 at the intersection of the diagonal braces 34, which can further provide a stabilizing effect on the corner posts 31.

[0064] In some embodiments, the spacing between the corner columns 31 below the corner column inflection point 32 is large, resulting in a long calculated length of the diagonal brace 34 and the corner column 31, poor stability, reduced bearing capacity of the component, requiring a larger cross section to ensure its safety, and increasing material consumption. Therefore, the cross brace 35 can be fixed only on the corner column 31 below the corner column inflection point 32, and a cross brace 35 and two intersecting diagonal braces 34 are formed as shown in FIG. Figure 1 In the K-shaped support shown in the figure, the diagonal brace 34 and the transverse brace 35 are both made of round steel tubes or square steel tubes. In order for the transverse brace 35 to provide sufficient lateral support for the diagonal brace 34 and the corner column 31 to reduce the calculated length of the diagonal brace 34 and the corner column 31, the transverse brace 35 has greater bending stiffness than the diagonal brace 34. The corner column 31 and the transverse brace 35 are intertwined and connected, and the transverse brace 35 is also intertwined and connected with the diagonal brace 34.

[0065] In this embodiment, all the cross braces 35 are placed horizontally, and the cross braces 35 on any side of the corner column frame are at the same height as the cross braces 35 on the other sides of the corner column frame, so as to form a cross brace frame on the corner column frame, that is, four cross braces 35 at the same height form a rectangular cross brace frame.

[0066] In this embodiment, if Figure 4 As shown, the lattice wind turbine tower also includes a wire splitter 4, which is arranged in the inner ring 37 at the corner column inflection point 32. During installation, the corner column 31 is arranged with a through prestressed steel strand 6 throughout its entire length, and the prestressed steel strand 6 at the corner column inflection point 32 needs to be turned, and then the wire splitter 4 is arranged at the corner column inflection point 32 to turn the prestressed steel strand 6 at the corner column inflection point 32.

[0067] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A lattice wind turbine tower, comprising: A top tower section (1), the top of the top tower section (1) being suitable for installing a wind turbine generator set (5); A transition section (2), the top end of which is fixed to the top tower section (1); a lattice segment, the top end of which is fixed to the transition segment (2), and the lattice segment is configured to support the top tower segment (1) and the transition segment (2); Characterized in that the lattice segment comprises: A plurality of corner posts (31), all of the corner posts (31) enclosed together to form a corner post frame, and the top ends of all of the corner posts (31) are fixed to the transition section (2); A plurality of reinforcing members, all of which are connected to two adjacent corner columns (31) along the side direction of the corner column frame; Wherein, any of the corner columns (31) is provided with a corner column inflection point (32), and the corner column (31) is bent toward the outside of the corner column frame at the corner column inflection point (32); The height of the corner column inflection point (32) is configured to be lower than or equal to the lowest height of the blade tip in the wind turbine generator set (5).

2. The lattice wind turbine tower according to claim 1, characterized in that: It also includes a prestressed reinforcement member (33), which is fixed to the corner column (31) and passes through a corner column inflection point (32) on the corner column (31).

3. The lattice wind turbine tower according to claim 2, characterized in that: The prestressed reinforcement member (33) is a plurality of prestressed threaded steel bars arranged in the corner column (31) and penetrating the corner column inflection point (32).

4. The lattice wind turbine tower according to claim 1, characterized in that: The reinforcement comprises a plurality of diagonal braces (34), each of which is connected between two adjacent corner columns (31) in the lateral direction of the corner column frame, and the plurality of diagonal braces (34) at the same height between the two corner columns (31) are intersected and fixed.

5. The lattice wind turbine tower according to claim 4, characterized in that: The reinforcement also includes a plurality of transverse braces (35), each of which is connected between two adjacent corner columns (31) in the lateral direction of the corner column frame, and the transverse braces (35) are fixed to a portion of the diagonal braces (34) at the intersection of the diagonal braces (34).

6. The lattice wind turbine tower according to claim 5, characterized in that: All the diagonal braces (34) on the lower side of the corner column inflection point (32) are connected to the transverse braces (35) at the intersection.

7. The lattice wind turbine tower according to claim 5, characterized in that: All the cross braces (35) are placed horizontally, and the cross braces (35) on any side of the corner column frame are at the same height as the cross braces on the other sides of the corner column frame to form a cross brace frame on the corner column frame.

8. The lattice wind turbine tower according to claim 2, characterized in that: The corner column (31) comprises: Outer ring (36); An inner ring (37), the inner ring (37) is arranged inside the outer ring (36) and is concentric with the outer ring (36), and the space between the outer ring (36) and the inner ring (37) is filled with concrete; The prestressed reinforcement member (33) is arranged in the concrete at the corner column inflection point (32) of the corner column (31).

9. The lattice wind turbine tower according to claim 8, characterized in that: It also comprises a wire dividing diverter (4), wherein the wire dividing diverter (4) is arranged in the inner ring (37) at the turning point (32) of the corner column.

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