Wind power tower transition conversion connecting device and wind power tower

Abstract

The utility model relates to the technical field of wind generating set tower structures, in particular to a wind power tower transition conversion connecting device and a wind power tower. The connecting device comprises a connecting cylinder, a connecting column, a supporting column and a steel strand. The connecting cylinder is connected with the tower cylinder, the connecting columns are located on the periphery of the connecting cylinder, one end of each supporting column is connected with the corresponding connecting column, and the other end of each supporting column is connected with the connecting cylinder or the corresponding connecting column; the connecting column and the corner column are coaxially arranged, the lower end of the connecting column is connected with the corner column, the corner column and the connecting column are both provided with shaft holes, the steel strand is located in the shaft holes, the upper end of the steel strand is connected with the connecting column, and the lower end of the steel strand is connected with a foundation. According to the invention, the structural stability and fatigue resistance of the tower connecting part are improved, and the service life is prolonged.

Description

Technical Field

[0001] This invention relates to the field of wind turbine tower structure technology, and in particular to a wind turbine tower transition and conversion connection device and a wind turbine tower. Background Technology

[0002] With the continuous development of wind power generation technology, the height and structural complexity of towers are constantly increasing. As a key structure supporting wind turbines, the design and connection method of the tower are crucial to power generation efficiency and safety. Quadrilateral lattice towers are widely used due to their advantages such as lightweight and high strength.

[0003] In existing technologies, the connection between quadrilateral lattice towers and circular tower sections typically employs either welding or floating connection techniques. Welding connections require extensive welding work on-site, increasing installation difficulty and potentially leading to stress concentration and fatigue damage at weld joints. Floating connections achieve a transition through flexible connectors, but this method suffers from insufficient stability under high wind speeds and complex loads, making it prone to loosening. Furthermore, existing transition section connection devices are structurally complex, inconvenient to transport and install, and incur high maintenance costs.

[0004] Therefore, the existing technology has the following problems: ① Existing welded connection technology requires a large amount of on-site welding work, increasing installation difficulty and time costs. ② Stress concentration is prone to occur at the connection, leading to fatigue damage and reducing the service life of the tower. ③ Floating connections lack stability under high wind speeds and complex load conditions, and are prone to loosening. ④ Existing transition section connection devices have complex structures, are inconvenient to transport and install, and have high maintenance costs. ⑤ Existing technology cannot effectively solve the problems of indirect force transmission and unstable connection between quadrilateral lattice towers and circular tower sections. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide a wind turbine tower transition connection device for connecting a quadrilateral lattice tower and a cylindrical tower.

[0006] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0007] A wind turbine tower transition connection device is disclosed for connecting a lattice tower and a tower body. The lattice tower has corner columns. The connection device includes a connecting cylinder, a connecting column, a support column, and steel strands. The connecting cylinder is connected to the tower body. Multiple connecting columns are located around the perimeter of the connecting cylinder. One end of the support column is connected to the connecting column, and the other end of the support column is connected to the connecting cylinder or the connecting column. The connecting column and the corner column are arranged coaxially. The lower end of the connecting column is connected to the corner column. Both the corner column and the connecting column have shaft holes. The steel strands are located in the shaft holes. The upper end of the steel strands is connected to the connecting column, and the lower end of the steel strands is connected to the foundation.

[0008] Optionally, the connecting cylinder includes a cylinder section and an L-shaped flange. The L-shaped flange includes an outer ring and a flange plate. The outer ring is welded to the cylinder section, and the flange plate is located on the inner ring of the outer ring. The flange plate is connected to the flange of the tower cylinder by annular groove rivets.

[0009] Optionally, the support column includes a first support and a second support. The inner end of the first support is connected to the outer wall of the tower, the outer end of the first support is connected to the outer wall of the connecting column, and the two ends of the second support are respectively connected to the outer walls of the two connecting columns.

[0010] Optionally, the first support includes an inclined support and a horizontal support, wherein the end of the inclined support connected to the connecting cylinder is higher than the end of the inclined support connected to the connecting column, and the second support is a horizontal support.

[0011] Optionally, each of the support columns comprises at least two sections, with each section connected by a weld neck flange.

[0012] Optionally, the connecting column includes a cylindrical steel cylinder and a weld neck flange. The weld neck flange is welded to the lower end of the cylindrical steel cylinder, and the weld neck flange of the connecting column is connected to the weld neck flange of the corner column by a grooved rivet.

[0013] Optionally, the top of the connecting post has a cap, and the upper end of the steel strand is connected to the cap.

[0014] Optionally, an operating platform is provided inside the connecting cylinder. The operating platform includes an H-shaped support beam and a galvanized platform plate, and a lifting channel is provided on the operating platform.

[0015] This invention also provides a wind turbine tower, including a lattice tower, a tower tube, and a wind turbine tower transition and conversion connection device as described above. The upper end of the connecting tube of the connection device is connected to the lower end of the tower tube of the lattice tower, and the lower end of the connecting column of the connection device is connected to the upper end of the corner column of the lattice tower.

[0016] Optionally, the lattice tower is a quadrilateral pyramidal structure, with each corner column connected by a rectangular tube.

[0017] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0018] The connecting device connects to the tower cylinder at the upper end and to the lattice-type tower at the lower end, with steel strands installed in the connecting columns and corner columns. From a mechanical perspective, it fully considers the structural stress characteristics, reducing the impact of strength, buckling, ultimate, and fatigue loads on the structure, minimizing stress concentration, and making the force transmission of the connecting device more direct, the connection more stable, and faster and more efficient. This connecting device improves the structural stability and fatigue resistance of the tower connection, extending its service life. It simplifies the installation and transportation process, reducing material and maintenance costs. It ensures more direct force transmission in the transition section, improving the overall rigidity and wind resistance of the tower. It adapts to different engineering needs and geographical conditions, flexibly adjusting structural dimensions and connection methods.

[0019] Prestressed technology, by introducing pre-tensioned stress into the structure, can effectively reduce stress concentration at tower connections, thereby improving the overall strength and stability of the structure. Enhanced wind resistance, improved connection stability, and overall rigidity increase the tower's ability to withstand wind in harsh weather conditions, thus increasing the operational safety of wind power equipment in high-wind-speed environments.

[0020] The overall structure of the transition and conversion connection device can be adapted to local conditions according to the wind farm load. The structural dimensions are not affected by road transportation, making it easy to assemble and install on site. The horizontal and diagonal supports are connected at both ends with necked welding flanges. The connecting column of the connection device and the lattice tower are connected with coaxial necked welding flanges. The structure is simple and easy to install, which simplifies the connection method between the single tower and the lattice tower, saves material usage, and achieves the purpose of reducing costs, increasing efficiency, and reducing operation and maintenance costs.

[0021] Advantages of additional aspects of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In addition, the spacing or dimensions between components are exaggerated to show the position of each component, and the schematic diagrams are for illustrative purposes only.

[0023] Figure 1 This is a schematic diagram of the connection device provided in an embodiment of the present invention after installation;

[0024] Figure 2 This is a schematic diagram of the connection device provided in an embodiment of the present invention;

[0025] Figure 3 yes Figure 1 Enlarged view at point I;

[0026] Figure 4 yes Figure 1 Enlarged view at point II;

[0027] Figure 5 This is a schematic diagram of the interior of the connecting cylinder provided in an embodiment of the present invention;

[0028] In the diagram: 1. Tower; 2. Connecting device; 3. Lattice tower; 4. Steel strand; 21. Connecting cylinder; 22. Support column; 23. Connecting column; 24. Operating platform; Detailed Implementation

[0029] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0030] Example 1

[0031] like Figure 1 , Figure 2 As shown in the figure, this embodiment proposes a wind turbine tower transition connection device 2 for connecting a lattice tower 3 and a tower 1. The lattice tower 3 has corner columns. The connection device 2 includes a connecting cylinder 21, a connecting column 23, a support column 22, and steel strands 4. The connecting cylinder 21 is connected to the tower 1. The connecting column 23 has multiple columns located around the perimeter of the connecting cylinder 21. One end of the support column 22 is connected to the connecting column 23, and the other end of the support column 22 is connected to either the connecting cylinder 21 or the connecting column 23. The connecting column 23 is coaxially arranged with the corner column, and the lower end of the connecting column 23 is connected to the corner column. Both the corner column and the connecting column 23 have shaft holes. The steel strands 4 are located in the shaft holes, with the upper end of the steel strands 4 connected to the connecting column 23 and the lower end of the steel strands 4 connected to the foundation.

[0032] The connecting cylinder 21 is connected to the tower cylinder 1 via a flange. The flange structure and connection method can achieve a stable connection using high-strength ring groove rivets. The lower end of the connecting column 23 is connected to the corner column, and steel strands 4 are installed in the shaft hole of the connecting column 23. The steel strands 4, through prestressing technology, enhance the stability of the structure, prevent excessive stress concentration due to excessive tower stress, reduce fatigue damage, and enhance the structure's wind resistance and seismic performance.

[0033] The transition connection device 2 effectively solves the connection problem between the lattice tower 3 and the tower 1. Through precise structural design and high-strength connection method, it enhances the overall stability and load-bearing capacity of the tower. At the same time, the application of prestressed steel strands 4 ensures the safety of the tower under severe conditions such as strong winds.

[0034] like Figure 5 As shown, the connecting cylinder 21 includes a cylinder section and an L-shaped flange. The L-shaped flange includes an outer ring and a flange plate. The outer ring is welded to the cylinder section, and the flange plate is located on the inner ring of the outer ring. The flange plate is provided with several rivet positioning holes and is connected to the flange of the tower cylinder 1 by ring groove rivets. This connection method helps to increase the tensile strength of the connection area and ensures a stable connection between the tower cylinder 1 and the connecting cylinder 21.

[0035] The support column 22 includes a first support and a second support. The inner end of the first support is connected to the outer wall of the tower 1, and the outer end of the first support is connected to the outer wall of the connecting column 23. The two ends of the second support are respectively connected to the outer walls of the two connecting columns 23. The first and second supports enhance the rigidity and stability of the connection, ensure the balance of the entire tower, and prevent excessive displacement caused by wind.

[0036] The first support includes diagonal supports and horizontal supports. The end of the diagonal support connected to the connecting cylinder 21 is higher than the end connected to the connecting column 23. The second support is a horizontal support. The diagonal support is located at the connection point between the connecting cylinder 21 and the connecting column 23, providing higher support force and effectively transmitting external forces. The straight connection formed by the horizontal support and the connecting column 23 provides stable lateral support, ensuring uniform stress on the tower and preventing uneven deformation. The combination of diagonal and horizontal supports, arranged at different angles, enhances the stability of the structure.

[0037] Each of the support columns 22 comprises at least two sections, and each section of support column 22 is connected by a weld neck flange (e.g., Figure 3 (As shown). The design of the multi-section support column 22 allows for fragmented transportation and quick assembly and installation at the wind farm site when road transport is restricted, providing a more flexible transportation and installation method and improving construction efficiency.

[0038] The connecting column 23 includes a cylindrical steel cylinder and a weld neck flange. The weld neck flange is welded to the lower end of the cylindrical steel cylinder. The weld neck flange of the connecting column 23 is connected to the weld neck flange of the corner column by grooved rivets (e.g., Figure 4 (As shown). The necked welding flange and the corner column flange are connected by ring groove rivets, which can effectively improve the wind resistance and overall rigidity of the tower.

[0039] The top of the connecting column 23 has a cap, and the upper end of the steel strand 4 is connected to the cap. Prestress is applied to the connecting device 2 through the steel strand 4. After prestressing, the upper and lower anchor cables are locked together, forming a stable, integrated structure with a round top and square bottom. The cap ensures that the upper end of the steel strand 4 can be fixed and prestressed, facilitating the installation and operation of the steel strand 4.

[0040] like Figure 2 , Figure 5 As shown, in order to facilitate daily operation and maintenance, an operating platform 24 is set within 1.2m of the upper L-shaped flange inside the connecting cylinder 21. The operating platform 24 includes an H-shaped support beam and a galvanized platform plate. In order to facilitate personnel going up and down, the operating platform 24 is also equipped with a lifting channel, so that personnel can work at height more safely and efficiently.

[0041] The connecting device 2 bears complex loads within the tower, playing a crucial supporting and force-transfer role. Prestressing is applied between the corner columns using high-strength grooved rivets and steel strands 4, improving material stability and fatigue resistance. It facilitates installation and transportation, reduces overall material manufacturing costs, and fully utilizes the structural advantages of the lattice tower 3. The use of high-strength grooved rivets between nodes solves problems such as stress concentration and fatigue damage at the connections. This device is flexible and adaptable, allowing for adjustments and optimization according to different engineering needs, accommodating various design requirements and geographical conditions. The use of high-strength grooved rivets between the various pole systems ensures convenient and quick installation, contributing to reduced material and maintenance costs.

[0042] Example 2

[0043] This embodiment provides a wind turbine tower, including a lattice tower 3, a tower cylinder 1, and a wind turbine tower transition and connection device 2 as described in Embodiment 1. The upper end of the connecting cylinder 21 of the connection device 2 is connected to the lower end of the tower cylinder 1 of the lattice tower 3, and the lower end of the connecting column 23 of the connection device 2 is connected to the upper end of the corner column of the lattice tower 3, forming a super-high tower main structure of 180m+.

[0044] The lattice-type tower 3 is a quadrilateral conical structure. The corner columns are connected by rectangular tubes, and the pole node plates are connected by high-strength ring groove rivets, forming a grid frame structure. This enhances the overall stability of the tower, provides strong wind resistance, and adapts to complex climatic conditions.

[0045] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A wind turbine tower transition connection device for connecting a lattice tower and a tower tube, the lattice tower having corner columns, characterized in that, The connecting device includes a connecting cylinder, a connecting column, a supporting column, and steel strands; The connecting cylinder is connected to the tower cylinder, and there are multiple connecting columns located around the perimeter of the connecting cylinder. One end of the support column is connected to the connecting column, and the other end of the support column is connected to the connecting cylinder or the connecting column. The connecting column and the corner column are arranged coaxially. The lower end of the connecting column is connected to the corner column. Both the corner column and the connecting column have shaft holes. The steel strand is located in the shaft holes. The upper end of the steel strand is connected to the connecting column, and the lower end of the steel strand is connected to the foundation.

2. The wind turbine tower transition connection device as described in claim 1, characterized in that, The connecting cylinder includes a cylinder section and an L-shaped flange. The L-shaped flange includes an outer ring and a flange plate. The outer ring is welded to the cylinder section, and the flange plate is located on the inner ring of the outer ring. The flange plate is connected to the flange of the tower cylinder by annular groove rivets.

3. The wind turbine tower transition connection device as described in claim 1, characterized in that, The support column includes a first support and a second support. The inner end of the first support is connected to the outer wall of the tower, and the outer end of the first support is connected to the outer wall of the connecting column. The two ends of the second support are respectively connected to the outer walls of the two connecting columns.

4. The wind turbine tower transition connection device as described in claim 3, characterized in that, The first support includes a diagonal support and a horizontal support. The end of the diagonal support connected to the connecting cylinder is higher than the end of the diagonal support connected to the connecting column. The second support is a horizontal support.

5. The wind turbine tower transition connection device as described in claim 3, characterized in that, Each of the support columns comprises at least two sections, and each support column section is connected to the other by a weld neck flange.

6. The wind turbine tower transition connection device as described in claim 1, characterized in that, The connecting column includes a cylindrical steel cylinder and a weld neck flange. The weld neck flange is welded to the lower end of the cylindrical steel cylinder, and the weld neck flange of the connecting column is connected to the weld neck flange of the corner column by annular groove rivets.

7. The wind turbine tower transition connection device as described in claim 1, characterized in that, The top of the connecting column has a cap, and the upper end of the steel strand is connected to the cap.

8. The wind turbine tower transition connection device as described in claim 1, characterized in that, An operating platform is provided inside the connecting cylinder. The operating platform includes an H-shaped support beam and a galvanized platform plate, and a lifting channel is provided on the operating platform.

9. A wind turbine tower, characterized in that, It includes a lattice tower, a tower tube, and a wind power tower transition and conversion connection device as described in any one of claims 1-8, wherein the upper end of the connecting tube of the connection device is connected to the lower end of the tower tube of the lattice tower, and the lower end of the connecting column of the connection device is connected to the upper end of the corner column of the lattice tower.

10. The wind turbine tower as described in claim 9, characterized in that, The lattice-type tower is a quadrilateral pyramidal structure, with rectangular tubes connecting the corner columns.

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