A yawable cable-stayed tower

Abstract

The present application discloses a yawable cable-stayed tower, comprising: a support column, a cable, a bracket, a middle bearing, and a bottom bearing. The upper end of the support column is used to connect to a wind turbine, the inner ring of the middle bearing is fixed to the middle of the support column, the bracket is fixed to the outer ring of the middle bearing, and the inner ring of the bottom bearing is fixed to the bottom of the support column. The upper end of the cable is connected to the wind turbine, and the lower end is connected to the outer ring of the bottom bearing. The end of the bracket away from the middle bearing contacts the middle of the cable, and the bracket, cable, and wind turbine nacelle are located on the same side. When the wind turbine yaws, it drives the cable, the outer ring of the middle bearing, and the outer ring of the bottom bearing to rotate together, so that the cable and bracket are always on the same side as the nacelle. The cable supported by the bracket increases the rigidity of the support column, thereby improving its stability in supporting the wind turbine.

Description

Technical Field

[0001] The present application relates to the technical field of wind power generation, and in particular to a yawable cable-stayed tower. Background Art

[0002] At present, the supporting columns of wind turbine generator sets are mainly in the form of cylindrical supporting columns. In order to reduce the cost of equipment, the method of reducing the amount of steel used in the supporting columns will be adopted. As the amount of steel used in the supporting columns is reduced, their stiffness will be reduced.

[0003] To address this issue, existing technologies use steel cables to connect the base of the support column to the foundation. This cable connection prevents interference between the blades and the cable when the wind turbine is yawed. However, this method of increasing support column stiffness is inflexible and unsuitable for situations where the wind turbine is yawed. Summary of the Invention

[0004] The purpose of this application is to provide a yawable cable-stayed tower, which can effectively increase the stiffness of the support column and thus improve the load-bearing stability.

[0005] To solve the above technical problems, this application provides the following technical solutions:

[0006] A yawable cable-stayed tower comprises: a support column, a cable, a bracket, a middle bearing and a bottom bearing, wherein the upper end of the support column is used to connect to a wind turbine generator set, the inner ring of the middle bearing is fixed to the middle part of the support column, the bracket is fixed to the outer ring of the middle bearing, the inner ring of the bottom bearing is fixed to the bottom of the support column, the upper end of the cable is connected to the wind turbine generator set, and the lower end is connected to the outer ring of the bottom bearing, the end of the bracket away from the middle bearing is in contact with the middle part of the cable, and the bracket, the cable and the nacelle of the wind turbine generator set are located on the same side.

[0007] Preferably, the cable-stayed tower comprises a plurality of cables and a plurality of brackets, wherein the plurality of brackets are distributed along the circumferential direction of the middle bearing, and one bracket supports one cable.

[0008] Preferably, the bracket is a support rod extending in a horizontal direction.

[0009] Preferably, the angle between the length extension direction of the support rod and the horizontal axis of the wind turbine generator set is 30° to 75°.

[0010] Preferably, a sliding groove extending in an up-down direction is provided on one end of the support rod away from the middle bearing, and the cable can be slidably connected in the sliding groove.

[0011] Preferably, the cable-stayed tower further comprises a pulley, wherein the pulley is connected to the slide groove via a rotating shaft, and an annular groove for supporting the cable is provided on the outer periphery of the pulley.

[0012] Compared with the existing technology, the above technical solution has the following advantages:

[0013] The present application provides a yawable cable-stayed tower, comprising: a support column, a cable, a bracket, a middle bearing, and a bottom bearing. The upper end of the support column is used to connect to a wind turbine, the inner ring of the middle bearing is fixed to the middle of the support column, the bracket is fixed to the outer ring of the middle bearing, and the inner ring of the bottom bearing is fixed to the bottom of the support column. The upper end of the cable is connected to the wind turbine, and the lower end is connected to the outer ring of the bottom bearing. The end of the bracket away from the middle bearing contacts the middle of the cable, and the bracket, cable, and wind turbine nacelle are located on the same side. When the wind turbine yaws, it drives the cable, the outer ring of the middle bearing, and the outer ring of the bottom bearing to rotate together, so that the cable and bracket are always on the same side as the nacelle. The cable supported by the bracket increases the stiffness of the support column, thereby improving its stability in supporting the wind turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the present application or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0015] Figure 1 A schematic diagram of the three-dimensional structure of a yawable cable-stayed tower provided in a specific embodiment of the present application;

[0016] Figure 2 A schematic side structural diagram of a yawable cable-stayed tower provided in accordance with a specific embodiment of the present application.

[0017] The reference numerals are as follows:

[0018] 1 is the wind turbine, 2 is the support column, 3 is the cable, 4 is the bracket, 5 is the middle bearing, 6 is the bottom bearing, and 7 is the floating foundation. DETAILED DESCRIPTION

[0019] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below with reference to the accompanying drawings.

[0020] The following description sets forth specific details to facilitate a thorough understanding of the present application. However, the present application can be implemented in a variety of other ways than those described herein, and those skilled in the art may make similar generalizations without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0021] Please refer to Figure 1 and Figure 2 , Figure 1 A schematic diagram of the three-dimensional structure of a yawable cable-stayed tower provided in a specific embodiment of the present application; Figure 2 A schematic side structural diagram of a yawable cable-stayed tower provided in accordance with a specific embodiment of the present application.

[0022] A specific embodiment of the present application provides a yawable cable-stayed tower, comprising: a support column 2, a cable 3, a bracket 4, a middle bearing 5 and a bottom bearing 6. The upper end of the support column 2 is used to connect the wind turbine 1, and the lower end of the support column 2 can be fixed on a floating foundation 7. The floating foundation is as shown in FIG. Figure 1 As shown, it includes three vertical columns, the upper and lower ends of which are connected by three crossbars to form a triangular prism frame structure. The lower end of the support column 2 is fixed to one of the columns. The floating foundation 7, bracket 4, and cable 3 are located on the same side, while the blades of the wind turbine 1 are located on different sides from the floating foundation 7. The inner ring of the middle bearing 5 is fixed to the middle of the support column 2, the bracket 4 is fixed to the outer ring of the middle bearing 5, and the inner ring of the bottom bearing 6 is fixed to the bottom of the support column 2. The upper end of the cable 3 is connected to the wind turbine 1, and the lower end is connected to the outer ring of the bottom bearing 6. The end of the bracket 4 away from the middle bearing 5 contacts the middle of the cable 3 to support the cable 3. The bracket 4, cable 3, and the nacelle of the wind turbine 1 are located on the same side. When the wind turbine 1 yaws, it drives the cables 3, the outer ring of the middle bearing 5, and the outer ring of the bottom bearing 6 to rotate together, ensuring that the cables 3 and the bracket 4 are always on the same side as the nacelle. The cables 3, supported by the bracket 4, increase the stiffness of the support column 2, thereby improving its stability in supporting the wind turbine 1. When the wind turbine 1 moves forward, the cables 3 are tightened, increasing the stiffness of the support column 2. When the wind turbine 1 moves backward, the cables 3 relax, and the stiffness of the support column 2 is unaffected. When the wind turbine 1 moves to the sides, the cables 3 are also tightened, increasing the lateral stiffness of the support column 2. Therefore, when the wind turbine 1 moves forward and backward, the backward load remains unchanged, while the forward load decreases, thereby reducing the load amplitude and thus reducing fatigue damage to the support column 2. When the wind turbine 1 moves sideways, the lateral stiffness of the support column 2 increases, and the lateral load is inversely proportional to the stiffness, reducing the load and fatigue damage.

[0023] In some embodiments of the present application, the cable-stayed tower includes multiple cables 3 and multiple brackets 4. The multiple brackets 4 are distributed along the circumferential direction of the middle bearing 5. One bracket 4 supports one cable 3. Figure 1 As shown, the structure includes two cables 3 and two brackets 4. The upper ends of the two cables 3 are connected to the nacelle of the wind turbine 1, and the lower ends of the two cables 3 are connected to the outer ring of the bottom bearing 6. The two brackets 4 are arranged in a V-shape when viewed from above. It should be noted that the above description uses only two cables 3 and two brackets 4 as an example. A larger number of cables 3 and brackets 4 can also be selected, and the specific selection can be based on actual conditions.

[0024] Among them, the bracket 4 is preferably a support rod extending in the horizontal direction, and one end of the support rod can be welded to the outer ring of the middle bearing 5. The angle between the length extension direction of the support rod and the horizontal axis of the wind turbine 1 is preferably 30° to 75°, and the angles between the two support rods and the horizontal axis of the wind turbine 1 are preferably the same. In addition, in order to improve the strength of the support rod, a middle bearing 5 with a longer axial length can be selected. In this case, a reinforcing rod can be set on the upper and lower sides of the support rod respectively. The reinforcing rod is set at an angle relative to the support column 2. One end of the reinforcing rod is fixed to the support rod, and the other end is fixed to the outer ring of the middle bearing 5. The reinforcing rod can improve the bending strength of the support rod, thereby ensuring the support stability of the cable 3.

[0025] In order to improve the stability of the cable 3, a slide groove extending in the up and down directions is provided on the end of the support rod away from the middle bearing 5. The cable 3 can be slidably connected in the slide groove to prevent the cable 3 from moving relative to the two sides of the support rod and falling out, thereby improving the support stability of the support rod for the cable 3.

[0026] Furthermore, the cable-type tower also includes a pulley, which is connected to the slide groove through a rotating shaft, that is, the pulley can rotate around the rotating shaft. The outer periphery of the pulley is provided with an annular groove for supporting the cable 3. The pulley can reduce the wear between the cable 3 and the support rod, thereby improving its service life.

[0027] To facilitate adjustment of the preload force of the cable 3, an adjustment member capable of adjusting the length of the cable 3 can be provided. The adjustment member comprises a screw and a nut. The cable 3 is divided into two sections, one of which is fixed to the nut and the other is connected to the screw. The screw and nut are threadedly connected, and the relative movement of the screw and nut allows adjustment of the length of the cable 3. The adjustment member also comprises a drum for winding the cable 3. The drum can be fixed to the outer ring of the bottom bearing 6. The length of the cable 3 can also be adjusted by rotating the drum.

[0028] It should be noted that, in this document, relational terms such as first and second, etc. are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0029] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present application. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A yawable cable-stayed tower, characterized in that: include: A support column (2), a cable (3), a bracket (4), a middle bearing (5) and a bottom bearing (6), wherein the upper end of the support column (2) is used to connect to the wind turbine (1), the inner ring of the middle bearing (5) is fixed to the middle of the support column (2), the bracket (4) is fixed to the outer ring of the middle bearing (5), the inner ring of the bottom bearing (6) is fixed to the bottom of the support column (2), the upper end of the cable (3) is connected to the wind turbine (1), and the lower end is connected to the outer ring of the bottom bearing (6), an end of the bracket (4) away from the middle bearing (5) contacts the middle of the cable (3), and the bracket (4), the cable (3) and the nacelle of the wind turbine (1) are located on the same side; It comprises a plurality of the cables (3) and a plurality of the brackets (4), wherein the plurality of the brackets (4) are distributed along the circumferential direction of the middle bearing (5), and one bracket (4) supports one cable (3); The bracket (4) is a support rod extending in the horizontal direction.

2. The yawable guyed tower according to claim 1, characterized in that: The included angle between the length extension direction of the support rod and the horizontal axis of the wind turbine generator set (1) is 30° to 75°.

3. The yawable guyed tower according to claim 1, characterized in that: A sliding groove extending in an up-down direction is provided on one end of the support rod away from the middle bearing (5), and the cable (3) can be slidably connected in the sliding groove.

4. The yawable guyed tower according to claim 3, characterized in that: It also includes a pulley, which is connected to the slide groove via a rotating shaft, and an annular groove is provided on the outer periphery of the pulley for supporting the cable (3).

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