Lattice type fan tower

Abstract

The utility model 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 with the top tower section, and the top end of the lattice section is fixed with 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 cannot collide with the tower in the running process, the conicity of the lattice section below the corner column inflection point can be flexibly adjusted, the structural efficiency is higher, the material consumption is smaller, the tower frequency can be flexibly adjusted by adjusting the conicity of the lattice section, and the fan efficiency is improved. Therefore, the resonance interval of the fan is avoided, and the safety of the tower is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of wind power, in particular to a lattice-type 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, and buckling fatigue, which lead to certain technical bottlenecks in the development of 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 tower technology routes to meet the requirements of higher tower heights and larger rotor diameters. Utility Model Content

[0006] In view of this, the present invention provides a lattice-type 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 posts, all of which together form a corner post frame, and all of which have their top ends fixed to the transition section;

[0013] A plurality of reinforcement members, all of which are connected to two adjacent corner posts along the side of the corner post 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 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 generator system.

[0016] By providing a corner post inflection point near the lowest position of the blade tip, the system can flexibly adapt to clearance restrictions, ensuring that the blades do not collide with the tower during operation. This allows the taper of the lattice section below the corner post inflection point to be flexibly adjusted, resulting in higher structural efficiency and reduced material consumption. Adjusting the lattice section taper also allows for flexible adjustment of the tower frequency, avoiding the turbine's resonance range and ensuring tower safety.

[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 passes through an upper corner column inflection point of the corner column.

[0018] Due to the large bending moment at the corner column inflection point, the concrete inside the corner column repeatedly cracks during wind turbine operation. The prestressing force of the steel strands threaded through the corner column inflection point alone is insufficient to control the concrete cracks. Therefore, a second layer of prestressing force is applied at the corner column inflection point using prestressed threaded steel bars to control cracking and enhance the concrete's fatigue resistance.

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

[0020] In an optional embodiment, the reinforcement 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 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 corner column inflection point 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 includes:

[0026] outer ring;

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

[0028] The prestressed reinforcement 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 and diverter, and the wire splitter and diverter is provided in the inner ring at the inflection point of the corner column.

[0030] The lattice wind turbine tower provided by the utility model has the following advantages:

[0031] 1. The utility model provides a lattice-type 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 mounting a wind turbine generator 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 enclose a corner column frame, 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 lateral direction of the corner column frame; wherein a corner column inflection point is provided on any of the corner columns, and the corner column bends 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 generator set.

[0032] This lattice wind turbine tower structure features a corner column inflection point located near or below the lowest blade tip. This allows for flexible adaptation to clearance restrictions, ensuring blades do not collide with the tower during operation. This allows for flexible adjustment of the lattice section's taper below the corner column inflection point, resulting in higher structural efficiency and reduced material usage. Adjusting the lattice section's taper also allows for flexible adjustment of the tower's frequency, avoiding the turbine's resonance range and ensuring tower safety.

[0033] 2. The present invention provides a lattice wind turbine tower, further comprising a prestressed reinforcement member secured to the corner post and extending through the corner post inflection point. Preferably, the prestressed reinforcement member comprises a plurality of prestressed threaded steel bars disposed within the corner post inflection point.

[0034] The large bending moments at the corner column inflection points of this lattice wind turbine tower structure cause repeated cracking of the concrete within these points during turbine operation. The prestressing force of the steel strands threaded through these points alone is insufficient to control the concrete cracking. Therefore, a second layer of prestressing force is applied to these points, using prestressed threaded steel bars to control cracking and enhance the concrete's fatigue resistance.

[0035] 3. The present invention provides a lattice wind turbine tower, wherein the reinforcement comprises a plurality of diagonal braces, each connecting between two adjacent corner posts along the lateral sides of the corner post frame. The diagonal braces at the same height between two corner posts intersect and secure. The reinforcement further comprises a plurality of transverse braces, each connecting between two adjacent corner posts along the lateral sides of the corner post frame. The transverse braces are secured to some of the diagonal braces at their intersections. All of the diagonal braces below the inflection points of the corner posts intersect with the transverse braces.

[0036] For a lattice wind turbine tower with 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 the need for a larger cross-section to ensure its safety, which increases material consumption. Therefore, 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 utility model 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 utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0038] Figure 1 This is a front view of a lattice wind turbine tower provided in an embodiment of the present utility model;

[0039] Figure 2 This is a schematic structural diagram of a corner column in a lattice-type wind turbine tower provided in an embodiment of the present utility model;

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

[0041] Figure 4 The present invention is a schematic structural diagram of a corner column inflection point in a lattice-type 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 strands. DETAILED DESCRIPTION

[0049] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts 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", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on 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 posts 31 and reinforcements. All corner posts 31 enclose a corner post frame, and the top ends of all corner posts 31 are fixed to the transition section 2. All reinforcements are connected to two adjacent corner posts 31 along the side of the corner post frame. A corner post inflection point 32 is provided on each corner post 31, and the corner post 31 bends toward the outside of the corner post frame at the corner post inflection point 32. The height of the corner post 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 posts 31 are arranged in a rectangular shape to form a corner post frame. The top of each corner post 31 is fixed to the transition section 2, thereby fixing the top of the transition section 2 to the top tower section 1. All reinforcements are connected to two adjacent corner posts 31 along the side of the corner post frame. The four corner posts 31 are fixed to each other by the reinforcements to improve the stability of the connection between the four corner posts 31.

[0055] In this embodiment, reinforcement members are only fixedly connected between two corner posts 31 on the sides of the rectangular corner post frame. No reinforcement members are provided between two diagonal corner posts 31. If further stability of the connection between the corner posts 31 is desired, reinforcement members can also be fixedly connected between two diagonal corner posts 31.

[0056] To prevent wind turbine blades from colliding with the tower during operation, the tower's cross-section is strictly limited within the impeller's rotational range, known as clearance restrictions. Within a certain range, greater spacing between the lattice tower's corner columns 31 results in higher structural efficiency and lower costs.

[0057] Therefore, in this embodiment, Figure 1 As shown, in order to meet the clearance restrictions, make the tower have better structural force efficiency, and reduce the cost of the tower, a corner column inflection point 32 is provided on each corner column 31, and the corner column 31 bends 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 of the wind turbine 5.

[0058] By providing a corner post inflection point 32 near the lowest position of the blade tip at corner post 31, headroom constraints can be flexibly accommodated, ensuring that the blades do not collide with the tower during operation. This allows for flexible adjustment of the lattice segment taper below corner post inflection point 32, resulting in higher structural efficiency and reduced material usage. Adjusting the lattice segment taper also allows for flexible adjustment of the tower frequency, avoiding the turbine's resonance range and ensuring tower safety.

[0059] In this embodiment, if Figure 3As shown, the lattice wind turbine tower also includes prestressed reinforcements 33, which are fixed to corner posts 31 and pass through corner post inflection points 32 on corner posts 31. Specifically, prestressed reinforcements 33 are several prestressed threaded steel bars disposed within corner posts 31, all of which pass through corner post inflection points 32.

[0060] In this embodiment, if Figure 2 and Figure 3 As shown, corner post 31 includes an outer ring 36 and an inner ring 37. Inner ring 37 is located concentrically within outer ring 36, and the space between outer ring 36 and inner ring 37 is filled with concrete. Due to the large bending moment at corner post inflection point 32, the concrete within this point repeatedly cracks during wind turbine operation. The prestressing force of the prestressed steel strands 6 threaded through this point alone is insufficient to control the concrete cracks. Therefore, prestressed reinforcements 33 are used within this point to provide a secondary prestressing force to control concrete cracking and enhance its fatigue resistance.

[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 posts 31 in the lateral direction of the corner post frame, and the plurality of diagonal braces 34 at the same height between the two corner posts 31 are intersected and fixed.

[0062] In this embodiment, the reinforcement further includes a plurality of transverse braces 35 . 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 some of the diagonal braces 34 at the intersections of the diagonal braces 34 .

[0063] Several intersecting diagonal braces 34 are connected between adjacent corner posts 31 along the lateral sides of the corner post frame to enhance the stability of the connection between the corner posts 31. Furthermore, several transverse braces 35 are connected between adjacent corner posts 31 along the lateral sides of the corner post frame. These transverse braces 35 are fixed to some of the diagonal braces 34 at their intersections, further stabilizing the corner posts 31.

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

[0065] In this embodiment, all cross braces 35 are placed horizontally. A cross brace 35 on any side of the corner post frame is at the same height as a cross brace 35 on each of the other sides of the corner post frame, thereby forming a cross brace frame on the corner post 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 and diverter 4, which is arranged within the inner ring 37 at the corner column inflection point 32. During installation, the prestressed steel strands 6 are arranged throughout the entire length of the corner column 31. The prestressed steel strands 6 at the corner column inflection point 32 need to be diverted, and the wire splitter and diverter 4 is installed at the corner column inflection point 32 to divert the prestressed steel strands 6 at the corner column inflection point 32.

[0067] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A lattice wind turbine tower, comprising: A top tower section (1), the top end 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 which enclose a corner post frame, and the top ends of all of which are fixed to the transition section (2); A plurality of reinforcement members, all of which are connected to two adjacent corner posts (31) along the side direction of the corner post frame; Wherein, any of the corner posts (31) is provided with a corner post inflection point (32), and the corner post (31) is bent toward the outside of the corner post frame at the corner post 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 the 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 (33) is a plurality of prestressed threaded steel bars arranged in the corner column (31) and passing through 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) and part of the diagonal braces (34) are fixed 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) being arranged inside the outer ring (36) and concentrically arranged with the outer ring (36), and the space between the outer ring (36) and the inner ring (37) being 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 includes a wire splitting diverter (4), which is arranged in the inner ring (37) at the corner post inflection point (32).

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