Combined tower drum structure of wind driven generator

Abstract

The utility model discloses a combined type tower drum structure of a wind driven generator, which comprises a four-corner support frame, a plurality of corrugated bodies and a plurality of cylinders, a connecting flange is arranged at the top of the four-corner support frame, the plurality of cylinders are fixed at the top of the plurality of corrugated bodies through the flange, the plurality of corrugated bodies comprise single corrugated bodies, tMD damping assemblies are arranged in the multiple corrugated bodies, the multiple cylinders comprise single arc plates, trapezoidal connecting pieces are arranged on the two sides of the single arc plates and the single corrugated bodies, annular flanges are arranged on the upper surfaces of the first arc plate and the second arc plate, and inner tensioning steel wire rope mechanisms are arranged between the annular flanges and the trapezoidal connecting pieces. Top flanges are arranged at the tops of the cylinders. Due to the fact that the corrugated bodies are arranged, the bending resistance, the shearing resistance and the torsion resistance of the corrugated bodies are superior to those of a traditional cone, the tower falling risk under extreme working conditions such as typhoon can be effectively reduced, the single corrugated bodies and the single arc plates are special-shaped plates, good corrosion resistance and durability are achieved, and the corrugated bodies and the arc plates can adapt to different natural environments.

Description

A combined tower structure for wind turbines Technical Field

[0001] This utility model relates to the technical field of wind power generation tower structure, specifically to a combined tower structure for a wind turbine. Background Technology

[0002] With the accelerated transformation of the global energy structure, wind turbine generators are developing towards higher power and higher altitudes. The single unit capacity of offshore wind turbines is rapidly iterating from 8-20MW to 30-50MW, while onshore wind towers are transforming from 5MW to 30MW. In order to obtain high-quality wind resources at altitudes of 60-700 meters, mainstream wind farms have required the tower height to be increased from the current 120-160 meters to 190 meters, and are developing towards 360 meters or more, to ensure that blades with a diameter of 300 meters and a rotor diameter of 630 meters can operate safely in high-quality wind conditions.

[0003] Existing wind turbine tower technologies suffer from structural defects, high costs, and transportation limitations. For example, the interface between concrete and steel in steel-concrete composite towers is prone to micro-cracks and exhibits poor dynamic performance, posing risks of resonance and collapse. Traditional cylindrical steel towers are difficult to transport by road, and existing steel towers use steel plates with wall thicknesses of 60-90mm in the middle and bottom sections to meet stiffness requirements, resulting in significant material waste. Therefore, there is an urgent need to design a composite tower structure for wind turbines to address these issues. Summary of the Invention

[0004] The purpose of this invention is to provide a combined tower structure for wind turbines to address the aforementioned shortcomings in the prior art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A combined tower structure for a wind turbine includes four corner support frames, multiple corrugated bodies, and multiple cylindrical bodies. Connecting flanges are provided at the top of the four corner support frames and at the bottom of the multiple corrugated bodies. The multiple cylindrical bodies are fixed to the top of the multiple corrugated bodies via flanges. Each corrugated body comprises a single corrugated body, and is composed of several single corrugated bodies joined together. Several arc plates are provided on one side of each single corrugated body. A TMD damping assembly is installed inside the multiple corrugated bodies.

[0007] The multiple cylindrical bodies include a single arc plate, which is spliced ​​together from several single arc plates. Several second arc plates are provided on the inner diameter of the single arc plate. Trapezoidal connectors are provided on both sides of the single arc plate and the single corrugated body. A circumferential flange is provided on the upper surface of the first and second arc plates. An internal tensioning wire rope mechanism is provided between the circumferential flange and the trapezoidal connector. A top flange is provided on the top of the multiple cylindrical bodies.

[0008] In a preferred embodiment of this utility model, the TMD damping assembly includes a counterweight block disposed inside the multi-corrugated body, a plurality of traction ropes disposed on the top of the counterweight block, the other end of the traction ropes being fixed to the top flange of the multi-corrugated body by bolts, and a plurality of viscous dampers disposed around the counterweight block, one end of the viscous damper being fixed to the inner wall of the multi-corrugated body.

[0009] In a preferred embodiment of this utility model, the circumferential flange includes a plurality of arc-shaped flange pieces, an arc-shaped flange ring is provided on the upper surface of the arc-shaped flange pieces, a reinforcing rib is provided between the arc-shaped flange pieces and the arc-shaped flange ring, and mortise and tenon connectors are provided at both ends of the arc-shaped flange pieces, and two arc-shaped flange pieces are connected and fixed by mortise and tenon connectors.

[0010] In a preferred embodiment of this utility model, the internal tensioning wire rope mechanism consists of a wire rope, an adjusting screw, an adjusting nut, and a screw.

[0011] The screw is installed in the mounting holes of the two trapezoidal connectors, the wire rope is installed in the gap between the two trapezoidal connectors, and one end of the wire rope is fixed by the screw. The adjusting screw is installed at the other end of the wire rope and passes through the arc-shaped flange ring. The adjusting nut is threadedly engaged with the adjusting screw.

[0012] In a preferred embodiment of this utility model, the two trapezoidal connectors are fixed together by a number of bolts, and the trapezoidal connectors not only serve as connectors but also as trapezoidal reinforcing ribs.

[0013] In a preferred embodiment of this utility model, the internal tensioning wire rope mechanism is respectively disposed inside multiple corrugated bodies and multiple cylindrical bodies.

[0014] In a preferred embodiment of this utility model, several dampers are provided at the connection between the four corner support frame and the multiple corrugated bodies, and a sealing gasket is provided between the connecting flange and the connection surface of the four corner support frame and the multiple corrugated bodies. The sealing gasket is made of polysulfide sealant and EPDM rubber strip.

[0015] In a preferred embodiment of this utility model, trapezoidal longitudinal ribs are provided on the inner side of the multiple cylindrical bodies. The trapezoidal longitudinal ribs are connected with the arc plate to form a reinforcing grid. The longitudinal flange is a trapezoidal area spine. The light steel keel structure formed by the longitudinal flange and the inner ring adjusting flange increases the tower's anti-collapse safety factor by more than 6 times.

[0016] In a preferred embodiment of this utility model, both the single corrugated body and the single arc plate are made of irregularly shaped plates. Several reinforcing rods are provided between the main rods of the four corner support frame. The four corner support frame adopts a quadrilateral spatial oblique truss structure. The main oblique tube is a DN-mm thin-walled weathering steel straight seam welded pipe. A wire rope tensioning mechanism is provided inside the pipe, and high-grade concrete of grade C or above is poured.

[0017] In the above technical solution, the combined tower structure of the wind turbine provided by this utility model has the following advantages:

[0018] (1) By setting multiple corrugated bodies, its bending, shear and torsion resistance is better than that of traditional cones, which can effectively reduce the risk of tower collapse under extreme conditions such as typhoons. The single corrugated body and the single arc plate adopt special-shaped plates, which have good corrosion resistance and durability, can adapt to different natural environments, and reduce the later maintenance cost.

[0019] (2) By setting up circumferential flanges, internal tensioning wire rope mechanism and trapezoidal connectors, the rigidity of the tower body is enhanced and the fatal defects of flexible wind towers are improved. The structural connection strength is further strengthened by the design of internal tensioning wire rope mechanism.

[0020] (3) By setting up TMD damping components, vibration transmission can be significantly suppressed, the stability of the tower body can be enhanced, and the number of resonance shutdowns can be reduced. The sealing gasket is made of polysulfide sealant and EPDM rubber strip, which enhances the sealing of the connection and can effectively prevent rainwater, dust and other substances from entering the tower body and protect the internal components from corrosion.

[0021] (4) By setting up a single corrugated body and a single arc plate, and adopting a multi-piece splicing structure, this segmented design makes the volume and weight of a single component smaller, making it easier to transport in complex terrain, reducing transportation difficulty and cost. At the same time, the splicing structure achieves a fast and stable connection through components such as trapezoidal connectors, improving installation efficiency and shortening the construction cycle. 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 embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0023] Figure 1 is a perspective view of the tower structure provided in an embodiment of the combined tower structure of a wind turbine generator according to this utility model.

[0024] Figure 2 is a cross-sectional view of a multi-corrugated structure provided in an embodiment of a combined tower structure for a wind turbine according to this utility model.

[0025] Figure 3 is a perspective view of a single corrugated structure provided in an embodiment of a combined tower structure for a wind turbine according to this utility model.

[0026] Figure 4 is a perspective view of a multi-cylinder structure provided in an embodiment of a combined tower structure for a wind turbine according to this utility model.

[0027] Figure 5 is a perspective view of a single-piece arc plate structure provided in an embodiment of a combined tower structure for a wind turbine according to this utility model.

[0028] Figure 6 is a top view of a multi-cylinder structure provided in an embodiment of a combined tower structure for a wind turbine according to this utility model.

[0029] Figure 7 is a perspective view of the circumferential flange structure provided in an embodiment of the combined tower structure of a wind turbine generator according to this utility model.

[0030] Figure 8 is a partial enlarged view of the structure shown in Figure 6, provided in an embodiment of the combined tower structure of a wind turbine generator according to this utility model.

[0031] 1. Four-corner support frame; 11. Reinforcing rod; 2. Multiple corrugated sheets; 21. Single corrugated sheet; 22. Arc plate one; 3. Multiple cylindrical sheets; 31. Single arc plate; 32. Arc plate two; 4. TMD damping assembly; 41. Counterweight; 42. Traction rope; 43. Viscous damper; 5. Trapezoidal connector; 6. Connecting flange; 7. Internal tensioning wire rope mechanism; 71. Wire rope; 72. Adjusting screw; 73. Adjusting nut; 74. Screw; 8. Top flange; 9. Circumferential flange; 91. Arc-shaped flange plate; 92. Reinforcing rib; 93. Tenon and mortise connector; 94. Arc-shaped flange ring. Detailed Implementation

[0032] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0033] As shown in Figures 1-8, the present invention provides a combined tower structure for a wind turbine, comprising a four-corner support frame 1, multiple corrugated bodies 2, and multiple cylindrical bodies 3. Connecting flanges 6 are provided at the top of the four-corner support frame 1 and the bottom of the multiple corrugated bodies 2. The multiple cylindrical bodies 3 are fixed to the top of the multiple corrugated bodies 2 via flange connections. The multiple corrugated bodies 2 include single corrugated bodies 21, which are assembled from several single corrugated bodies 21. Several arc plates 22 are provided on one side of each single corrugated body 21. The corrugated body 2 is equipped with a TMD damping component 4. The multi-cylinder body 3 includes a single arc plate 31. The multi-cylinder body 3 is composed of several single arc plates 31 spliced ​​together. Several arc plates 32 are provided on the inner diameter of the single arc plate 31. Trapezoidal connectors 5 are provided on both sides of the single arc plate 31 and the single corrugated body 21. A circumferential flange 9 is provided on the upper surface of the arc plate 1 22 and the arc plate 2 32. An internal tensioning wire rope mechanism 7 is provided between the circumferential flange 9 and the trapezoidal connector 5. A top flange 8 is provided on the top of the multi-cylinder body 3.

[0034] In this embodiment, the top of the four-corner support frame 1 and the bottom of the multi-corrugated body 2 are both provided with connecting flanges 6. The multi-cylinder 3 is fixed to the top of the multi-corrugated body 2 through flange connection. The multi-corrugated body 2 includes a single corrugated body 21. The materials and processes of the single corrugated body 21 and the single arc plate 31 are special-shaped plates. Their surfaces are passivated, so there is no need for galvanizing or painting. The corrosion resistance is improved by 50%, and the service life is extended to more than 30 years. The multi-corrugated body 2 is spliced ​​from several single corrugated bodies 21. Several arc plates 22 are provided on one side of the single corrugated body 21. The arc of the arc plate 22 is 30°-60°, and the thickness gradually changes from bottom to top with the corrugated body. It is bolted to the circumferential flange 9 to form a closed reinforcing ring, which improves the torsional stiffness.

[0035] Specifically, the multi-cylinder 3 includes a single arc plate 31, which is spliced ​​together from several single arc plates 31. Several arc plates 32 are set on the inner diameter of the single arc plate 31. The arc plates 32 intersect perpendicularly with the trapezoidal connector 5, thereby increasing the equivalent stiffness of the multi-cylinder 3. Trapezoidal connectors 5 are set on both sides of the single arc plate 31 and the single corrugated body 21. The trapezoidal connector 5 is designed as a trapezoidal structure with unequal sides on the left and right sides. It adopts a "half-mortise and half-weld" process: 50% of the joint length is welded, and the remaining part is connected by M30 high-strength bolts and coated with anti-removal adhesive to ensure the connection strength and avoid welding stress concentration. A top flange 8 is set on the top of the multi-cylinder 3.

[0036] In this embodiment, a TMD damping assembly 4 is installed inside the multi-corrugated body 2. The TMD damping assembly 4 includes a counterweight 41 installed inside the multi-corrugated body 2. The mass of the counterweight 41 is 1-3% of the total mass of the top of the tower. It is made of high-density concrete and encased in steel plate for rust prevention. Several traction ropes 42 are installed on the top of the counterweight 41. The other end of the traction ropes 42 is fixed to the top flange of the multi-corrugated body 2 by bolts. The traction ropes 42 are unbonded steel strands with a diameter of 20-30mm. Together with 24 viscous dampers 43, a "passive vibration reduction system" is formed at a height of 150m, which can reduce the vibration amplitude of the tower by more than 60%. Several viscous dampers 43 are installed around the counterweight 41. One end of the viscous damper 43 is fixed to the inner wall of the multi-corrugated body 2.

[0037] In this embodiment, circumferential flanges 9 are provided on the upper surfaces of arc plate 1 22 and arc plate 2 32. The circumferential flanges 9 are staggered and fixed to the arc plates. The circumferential flanges 9 include a plurality of arc-shaped flange pieces 91. An arc-shaped flange ring 94 is provided on the upper surface of the arc-shaped flange piece 91. A reinforcing rib 92 is provided between the arc-shaped flange piece 91 and the arc-shaped flange ring 94. A tenon and mortise connector 93 is provided at both ends of the arc-shaped flange piece 91. The two arc-shaped flange pieces 91 are connected and fixed by the tenon and mortise connector 93.

[0038] In this embodiment, an internal tensioning wire rope mechanism 7 is provided between the circumferential flange 9 and the trapezoidal connector 5. The internal tensioning wire rope mechanism 7 consists of a wire rope 71, an adjusting screw 72, an adjusting nut 73, and a screw 74.

[0039] Specifically, the screw 74 is installed in the mounting holes of the two trapezoidal connectors 5, and the wire rope 71 is installed in the gap between the two trapezoidal connectors 5. The wire rope 71 is made of galvanized steel with a diameter of 16-20mm. The two layers are staggered by 45° to avoid stress superposition. One end of the wire rope 71 is fixed by the screw 74. The adjusting screw 72 is installed at the other end of the wire rope 71 and passes through the arc-shaped flange ring 94. The adjusting screw 72 is made of 40Cr alloy steel. The adjusting nut 73 is threaded with the adjusting screw 72. The adjusting nut 73 adopts a double nut anti-loosening design. The pre-tightening force can be adjusted to 200-300kN by a torque wrench, so that the splicing gap between the multiple corrugated bodies 2 and the multiple cylindrical bodies 3 is controlled within 0.5mm, and the overall torsional stiffness is improved.

[0040] In this embodiment, the two trapezoidal connectors 5 are fixed together by a number of bolts. The trapezoidal connectors 5 not only serve as connectors but also as trapezoidal reinforcing ribs.

[0041] In this embodiment, the internal tensioning wire rope mechanism 7 is respectively installed inside the multiple corrugated bodies 2 and the multiple cylindrical bodies 3.

[0042] In this embodiment, several dampers are provided at the connection between the four-corner support frame 1 and the multiple corrugated bodies 2, and a sealing gasket is provided between the connecting flange 6 and the connection surface of the four-corner support frame 1 and the multiple corrugated bodies 2. The sealing gasket is made of polysulfide sealant and EPDM rubber strip.

[0043] In this embodiment, trapezoidal longitudinal ribs are provided on the inner side of the multiple cylindrical bodies 3. The trapezoidal longitudinal ribs are connected with the arc plate 32 to form a reinforcing grid. The longitudinal flange is a trapezoidal area spine. The light steel keel structure formed by the longitudinal flange and the inner ring adjusting flange increases the safety factor against collapse of the tower by more than 6 times.

[0044] In this embodiment, both the single corrugated body 21 and the single arc plate 31 are made of special-shaped plates, which effectively reduces the corrosion of the tower body by the environment. Several reinforcing rods 11 are set between the main rods of the four corner support frame 1. The four corner support frame 1 adopts a quadrilateral spatial inclined truss structure. The main inclined tube is a DN500-1500mm thin-walled weathering steel straight seam welded pipe. The inside of the pipe is equipped with a wire rope tensioning mechanism and is cast with high-grade concrete of C50 or above, which improves the buckling resistance of the main inclined tube.

[0045] Work steps: 1. Assemble the main poles of the four corner support frame 1 according to the quadrilateral spatial inclined truss structure. The main poles are connected and fixed by the reinforcing rods 11. The main inclined pipe is made of weather-resistant steel straight seam welded pipe. The pipe is equipped with a steel wire rope tensioning mechanism and is cast with high-grade concrete of C50 or above.

[0046] 2. Prepare several single corrugated bodies 21 and splice them together using trapezoidal connectors 5 on both sides. Fix the trapezoidal connectors 5 between adjacent single corrugated bodies 21 with several bolts to form multiple corrugated bodies 2. After splicing, install the TMD damping assembly 4 inside the multiple corrugated bodies 2.

[0047] 3. After the multiple corrugated bodies 2 are spliced ​​together, they are connected to the connecting flange 6 at the bottom and the connecting flange 6 at the top of the four corner support frame 1 through the connecting flange 6 at the bottom. A damper and a sealing gasket made of polysulfide sealant and EPDM rubber strip are set at the connection. Then the connecting bolts are tightened.

[0048] 4. Install a circumferential flange 9 on the upper surface of the arc plate 22 of the multi-corrugated body 2 and then fix it with bolts. Set an internal tensioning wire rope mechanism 7 between the circumferential flange 9 and the trapezoidal connector 5 and adjust the tension by adjusting nut 73.

[0049] 5. Prepare several single arc plates 31 and splice them together using trapezoidal connectors 5 on both sides. Fix the trapezoidal connectors 5 between adjacent single arc plates 31 with bolts to form multiple cylindrical bodies 3. Install circumferential flanges 9 on the upper surface of the arc plate 32 in the same way as the circumferential flanges 9 on the multiple corrugated bodies 2. Connect and fix the spliced ​​multiple cylindrical bodies 3 to the flanges at the bottom and top of the multiple corrugated bodies 2 through the flanges at the bottom.

[0050] 6. Install the top flange 8 on the top of the multiple cylindrical sections 3, and ensure that the connection is firm to complete the installation of the entire wind turbine combined tower structure.

[0051] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A combined tower structure for a wind turbine, comprising four corner support frames (1), multiple corrugated sheets (2), and multiple cylindrical sheets (3), characterized in that, The top of the four-corner support frame (1) and the bottom of the multi-corrugated body (2) are both provided with connecting flanges (6). The multi-cylinder (3) is fixed to the top of the multi-corrugated body (2) through flange connection. The multi-corrugated body (2) includes a single corrugated body (21). The multi-corrugated body (2) is spliced ​​from several single corrugated bodies (21). Several arc plates (22) are provided on one side of the single corrugated body (21). TMD damping components (4) are provided inside the multi-corrugated body (2). The multi-cylinder (3) includes a single arc plate (22). The plate (31) is composed of several single arc plates (31) spliced ​​together. Several arc plates (32) are provided on the inner diameter of the single arc plate (31). Trapezoidal connectors (5) are provided on both sides of the single arc plate (31) and the single corrugated body (21). Circumferential flanges (9) are provided on the upper surfaces of the arc plate (22) and the arc plate (32). An internal tensioning wire rope mechanism (7) is provided between the circumferential flange (9) and the trapezoidal connector (5). A top flange (8) is provided on the top of the multiple cylinders (3).

2. The combined tower structure of a wind turbine generator according to claim 1, characterized in that, The TMD damping assembly (4) includes a counterweight (41) disposed inside the multi-corrugated body (2). Several traction ropes (42) are disposed on the top of the counterweight (41). The other end of the traction ropes (42) is fixed to the top flange of the multi-corrugated body (2) by bolts. Several viscous dampers (43) are disposed around the counterweight (41). One end of the viscous damper (43) is fixed to the inner wall of the multi-corrugated body (2).

3. The combined tower structure of a wind turbine generator according to claim 1, characterized in that, The circumferential flange (9) includes several arc-shaped flange pieces (91). An arc-shaped flange ring (94) is provided on the upper surface of the arc-shaped flange piece (91). A reinforcing rib (92) is provided between the arc-shaped flange piece (91) and the arc-shaped flange ring (94). A tenon and mortise connector (93) is provided at both ends of the arc-shaped flange piece (91). Two arc-shaped flange pieces (91) are connected and fixed by the tenon and mortise connector (93).

4. The combined tower structure of a wind turbine generator according to claim 1, characterized in that, The internal tensioning wire rope mechanism (7) consists of a wire rope (71), an adjusting screw (72), an adjusting nut (73), and a screw (74). The screw (74) is installed in the mounting holes of the two trapezoidal connectors (5), the wire rope (71) is installed in the gap between the two trapezoidal connectors (5), and one end of the wire rope (71) is fixed by the screw (74). The adjusting screw (72) is installed at the other end of the wire rope (71), and the adjusting screw (72) passes through the arc-shaped flange ring (94). The adjusting nut (73) is threadedly engaged with the adjusting screw (72).

5. The combined tower structure of a wind turbine generator according to claim 1, characterized in that, The two trapezoidal connectors (5) are fixed together by a number of bolts. The trapezoidal connectors (5) not only serve as connectors but also as trapezoidal reinforcing ribs.

6. The combined tower structure of a wind turbine generator according to claim 1, characterized in that, The internal tensioning wire rope mechanism (7) is respectively installed inside the multiple corrugated bodies (2) and multiple cylindrical bodies (3).

7. The combined tower structure of a wind turbine generator according to claim 1, characterized in that, Several dampers are provided at the connection between the four corner support frame (1) and the multiple corrugated bodies (2). A sealing gasket is provided between the connection flange (6) and the connection surface of the four corner support frame (1) and the multiple corrugated bodies (2). The sealing gasket is made of polysulfide sealant and EPDM rubber strip.

8. The combined tower structure of a wind turbine generator according to claim 1, characterized in that, The inner side of the multiple cylindrical bodies (3) is provided with trapezoidal longitudinal ribs. The trapezoidal longitudinal ribs are connected with the arc plate (32) to form a reinforcing grid. The longitudinal flange is a trapezoidal area spine. The light steel keel structure formed by the longitudinal flange and the inner ring adjusting flange increases the safety factor against collapse by more than 6 times.

9. The combined tower structure of a wind turbine generator according to claim 1, characterized in that, Both the single corrugated body (21) and the single arc plate (31) are made of special-shaped plates. Several reinforcing rods (11) are set between the main rods of the four corner support frame (1). The four corner support frame (1) adopts a quadrilateral spatial oblique truss structure. The main oblique pipe is a DN500-1500mm thin-walled weathering steel straight seam welded pipe. The pipe is equipped with a wire rope tensioning mechanism and is cast with high-grade concrete of C50 or above.

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