Assembling structure on damaged tower drum of fan and repairing method

Abstract

The invention provides an assembling structure on a damaged tower drum of a fan and a repairing method, and belongs to the field of wind power generation maintenance. The problems that a damaged tower drum of a draught fan is difficult to repair and high in cost, and a tower drum section needs to be lowered to the ground for segmented operation are solved. The tower drum comprises an upper complete tower drum section, a lower complete tower drum section and a damaged tower drum section, and the assembly structure comprises a supporting assembly which comprises an upper supporting assembly body and a lower supporting assembly body which are the same in structure and are formed by splicing a plurality of first arc-shaped supporting parts, the outer diameter of the whole body is the same as the inner diameter of the tower drum; the connecting and supporting assembly is formed by splicing a plurality of second arc-shaped supporting parts, and surrounding assembly supporting parts are arranged on the peripheral walls of the second arc-shaped supporting parts; and the enclosing assembly is formed by splicing a plurality of third arc-shaped supporting parts, is integrally cylindrical and wraps the outer wall of the tower drum. The device is mainly used for repairing the damaged tower drum.

Description

Technical Field

[0001] The present invention belongs to the field of wind power generation maintenance, and particularly relates to an assembly structure and a repair method on a damaged wind turbine tower barrel. Background Art

[0002] As a clean, pollution-free, renewable, widely distributed and huge in reserves energy, wind energy has received people's attention and emphasis. In order to obtain more wind resources, the single-unit capacity of wind turbines is getting larger and larger, the wind turbine blades are getting longer and the wind turbine tower barrels are getting higher. The large-scale of wind turbines puts forward higher requirements for the strength, stiffness and fatigue resistance of the tower barrel structure. While the ultra-high tower barrel bears greater bending moment and vibration load, the construction and operation and maintenance difficulties increase significantly: the risks of high-altitude welding and hoisting increase, the distortion and deformation during transportation and installation are more likely to occur, and in complex environments such as typhoons, ice and snow, and salt spray, the cumulative effect of local damage and fatigue cracks of the tower barrel becomes more obvious.

[0003] Therefore, during the whole life cycle of transportation, installation and operation of the wind turbine tower barrel, local depressions, crack propagation or overall buckling and other damages often occur due to various factors such as extreme wind loads, ice and snow adhesion, offshore salt spray corrosion, manufacturing or construction defects, and the failure of the braking or pitch control system. This not only affects the safe operation of the unit, but also brings great challenges to operation and maintenance and overhaul. Studying the repair method of the wind turbine tower barrel is of great significance for ensuring the normal operation of the wind farm.

[0004] Traditional tower barrel repair methods often need to use large cranes to remove the damaged section and replace it with a new section. The equipment mobilization cost is high and the construction period is long, which seriously affects the availability of the wind turbine and the economy of the project. Chinese Patent CN112090990A discloses a repair construction method for the depression of a wind turbine tower barrel. This repair method can repair the depression of the wind turbine tower barrel and avoid the back depression after the repair of the wind turbine tower barrel. However, this repair method needs to lower the tower barrel section to the ground for segmented operation, and can only repair the damage of the depression of the tower barrel wall, and it is difficult to be applied to the on-site high-altitude repair scenarios of tower collapse or the whole machine that is inconvenient to disassemble.

[0005] In order to solve these problems, a structure and a repair method of adding an assembly structure to a damaged wind turbine tower barrel are proposed, which can meet the requirements of rapid and reliable repair of tower collapse or severely damaged tower barrel sections. Summary of the Invention

[0006] In view of this, the present invention aims to propose an assembly structure and a repair method on a damaged wind turbine tower barrel to solve the problems of difficult repair, high cost of the damaged wind turbine tower barrel and the need to lower the tower barrel section to the ground for segmented operation.

[0007] To achieve the above object, the present invention adopts the following technical solutions. According to the first aspect of the present invention, a splicing structure on a damaged wind turbine tower is provided. The tower includes an upper intact tower section, a lower intact tower section, and a damaged tower section. The splicing structure includes:

[0008] Support components, including an upper support component and a lower support component with the same structure, both are formed by splicing a number of first arc-shaped support parts, and the whole is in the shape of a cylinder with an outer diameter the same as the inner diameter of the tower. One end of the upper support component away from the connecting support component is connected to the upper flange of the upper intact tower section, and one end of the lower support component away from the connecting support component is connected to the lower flange of the lower intact tower section;

[0009] Connecting support components, arranged between the upper support component and the lower support component, are formed by splicing a number of second arc-shaped support parts, and the whole is in the shape of a cylinder with the same diameter as the tower. Among them, an enclosure component support part is arranged on the peripheral wall of the second arc-shaped support part;

[0010] Enclosure components, including an upper enclosure component and a lower enclosure component with the same structure, both are formed by splicing a number of third arc-shaped support parts, and the whole is in the shape of a cylinder, covering the outer wall of the tower. The ends of the upper enclosure component and the lower enclosure component are respectively connected to the two end faces of the enclosure component support part.

[0011] Furthermore, the axial length of the connecting support component is adapted to the damaged length of the damaged tower section.

[0012] Furthermore, the splicing joints between the first arc-shaped support parts and the splicing joints between the second arc-shaped support parts are arranged staggeredly, and the splicing joints between the second arc-shaped support parts and the splicing joints between the third arc-shaped support parts are arranged staggeredly.

[0013] Furthermore, the arc length of the first arc-shaped support part is less than the arc length of the second arc-shaped support part.

[0014] Furthermore, a number of first circumferential side connection parts are arranged axially at both edge positions of the inner wall of the first arc-shaped support part. Adjacent first arc-shaped support parts are connected through the first circumferential side connection parts at corresponding positions. First end connection parts are arranged at both ends of the first arc-shaped support part, and the first end connection parts are connected to the upper flange, the lower flange or the connecting support component.

[0015] Furthermore, a number of second circumferential side connection parts are arranged at both edge positions of the inner wall of the second arc-shaped support part. Adjacent second arc-shaped support parts are connected through the second circumferential side connection parts. Second end connection parts are arranged at both ends of the second arc-shaped support part, and the second end connection parts are connected to the corresponding first end connection parts.

[0016] Further, a number of third circumferential side connection parts are arranged at the outer wall edges on both sides of the third arc-shaped support part, and adjacent third arc-shaped support parts are connected by the third circumferential side connection parts. A third end connection part is arranged at one end of the third arc-shaped support part close to the enclosure component support part and is connected to the enclosure component support part.

[0017] Further, the first end connection part, the second end connection part and the third end connection part are all arc-shaped connecting plates, and uniformly arranged openings are provided on the plate surface for aligning and connecting fixing parts.

[0018] Further, the first circumferential side connection part, the second circumferential side connection part and the third circumferential side connection part are all flanges, and openings are provided on the flanges for aligning and connecting fixing parts.

[0019] According to the second aspect of the present invention, there is provided a repair method for using an assembly structure on a damaged tower barrel of a fan as described above, including the following steps:

[0020] Upright the fallen fan tower barrel.

[0021] Observe the damage condition of the damaged tower barrel section and design the dimensions adopted for the assembly structure.

[0022] Transport the support component into the damaged tower barrel section, remove the bolts of the original flange of the damaged tower barrel section, and bolt-connect a number of first arc-shaped support parts and the flange of the intact tower barrel section, so that the upper support component and the lower support component are fixed inside the damaged tower barrel section.

[0023] Fix adjacent first arc-shaped support parts to make the support component form an inner circle covering the inner wall of the damaged tower barrel section.

[0024] First install some second arc-shaped support parts on the tension and damage side of the damaged tower barrel section. After fixedly connecting this part of the second arc-shaped support parts with the upper support component and the lower support component, cut off the damaged tower barrel wall on the bending and compression side of the damaged tower barrel section, and then complete the fixed connection of the remaining second arc-shaped support parts with the upper support component and the lower support component. Fix adjacent second arc-shaped support parts to make the connecting support component form a ring to support the fan tower barrel wall, and weld the fan tower barrel wall and the connecting support component.

[0025] Fix a number of third arc-shaped support parts with the enclosure component support part, and complete the fixation of adjacent third arc-shaped support parts, so that the enclosure component forms an outer circle to wrap the outer wall of the damaged tower barrel section.

[0026] Reinstall the fan head to be replaced to make the fan resume normal operation.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] 1. This structure is fixedly connected to the damaged tower section through a flange, enabling repair construction to be completed in-situ without the need to disassemble the damaged section of the tower as a whole. This reduces the engineering repair cost. At the same time, the in-situ repair method does not require lowering the tower section to the ground, which has the advantages of low cost and small workload, helping the wind turbine to quickly resume its working state and improving the energy efficiency of the overall process.

[0029] 2. For the damaged tower section of this structure, support components are assembled inside and outside simultaneously, and the connection support components and the enclosure components are connected to form an inner-middle-outer three-layer collaborative stress structure, which can concentrically support and wrap and reinforce various damage forms such as dents, cracks, and local buckling, thereby quickly restoring the overall stiffness and bending resistance of the tower, and ensuring the long-term reliability of the reinforced structure.

[0030] 3. By arranging the splicing joints in a staggered manner, this structure can improve the integrity of the assembled structure, enhance the shear and tensile resistance, and ensure the reliability of the repaired wind turbine tower section. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0032] Figure 1 is the distribution position diagram of the upper intact tower section, the lower intact tower section, and the damaged tower section described in the present invention;

[0033] Figure 2 is the schematic structural diagram of a splicing structure on the damaged wind turbine tower of the present invention with some enclosure components removed;

[0034] Figure 3 is the schematic connection relationship diagram of the support components described in the present invention;

[0035] Figure 4 is the cross-sectional view of a splicing structure on the damaged wind turbine tower described in the present invention;

[0036] Figure 5 is the Figure 4 side view of the present invention;

[0037] Figure 6 is the Figure 5 partial schematic diagram of the present invention;

[0038] Figure 7 is the schematic structural diagram of the upper support component and the lower support component described in the present invention;

[0039] Figure 8 is the Figure 7 second perspective structural diagram of the present invention;

[0040] Figure 9 For the present invention Figure 7 top view;

[0041] Figure 10 Schematic structural diagram of the connection relationship between the second arc support part and the second end connection part of the present invention;

[0042] Figure 11 Schematic diagram of the distribution position of the enclosure component support part of the present invention;

[0043] Figure 12 For the present invention Figure 10 top view;

[0044] Figure 13 Schematic structural diagram of the third arc support part of the present invention;

[0045] Figure 14 Schematic diagram of the connection relationship between the third end connection part and the third arc support part of the present invention;

[0046] Figure 15 For the present invention Figure 14 top view;

[0047] Figure 16 Flowchart of the repair method using an assembly structure on a damaged wind turbine tower of the present invention.

[0048] Upper intact tower section 1; lower intact tower section 2; damaged tower section 3; upper flange 31; lower flange 32; support assembly 4; upper support assembly 41; lower support assembly 42; connecting support assembly 5; enclosure assembly 6; upper enclosure assembly 61; lower enclosure assembly 62; first arc support part 7; first end connection part 8; first circumferential connection part 9; opening 10; second arc support part 11; second circumferential connection part 12; second end connection part 13; enclosure component support part 14; third arc support part 15; third circumferential connection part 16; third end connection part 17. Detailed implementation manners

[0049] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. It should be noted that, without conflict, the embodiments and features in the embodiments of the present invention can be combined with each other. The described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0050] It should be noted that the descriptions of directions such as "left", "right", "left side", "right side", "upper part", "lower part", "top", "bottom", etc. in the present invention are all defined based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the described structure must be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In the description of the present invention, "a plurality of" means more than two, unless otherwise specifically defined.

[0051] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "coupled" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0052] Referring to the accompanying drawings to illustrate this embodiment, according to the first aspect of the present invention, a splicing structure on a damaged tower barrel of a wind turbine is provided. The tower barrel includes an upper intact tower barrel section 1, a lower intact tower barrel section 2, and a damaged tower barrel section 3. The splicing structure includes:

[0053] A support assembly 4, including an upper support assembly 41 and a lower support assembly 42 with the same structure, both of which are formed by splicing a number of first arc-shaped support portions 7. The whole is in a cylindrical shape with an outer diameter the same as the inner diameter of the tower barrel. One end of the upper support assembly 41 away from the connection support assembly 5 is connected to the upper flange 31 of the upper intact tower barrel section 1, and one end of the lower support assembly 42 away from the connection support assembly 5 is connected to the lower flange 32 of the lower intact tower barrel section 2. The upper support assembly 41 and the lower support assembly 42 are mainly used to remove the bolts of the damaged tower barrel section 3, connect to the flange structures of the undamaged upper intact tower barrel section 1 and the damaged tower barrel section 3, and then form a support for the upper intact tower barrel section 1 and the damaged tower barrel section 3 after splicing with the connection support assembly 5. The specific angle of the first arc-shaped support portion 7 is 30 degrees. Three equally spaced first circumferential connection portions 9 are arranged at each side edge position of the first arc-shaped support portion 7, and two openings 10 are provided on each first circumferential connection portion 9. The height of the upper support assembly 41 is the distance from the upper flange 31 of the damaged tower barrel section 3 to the upper part of the break, and the height of the lower support assembly 42 is the distance from the lower flange 32 of the damaged tower barrel section 3 to the lower part of the break. The first arc-shaped support portion 7 can closely adhere to the inner wall of the damaged tower barrel section 3. The angles of the twelve first arc-shaped support portions 7 add up to 360 degrees, and they are bolt-connected to each other through the first circumferential connection portion 9, that is, the flange, to form an inner circle covering the inner wall of the damaged tower barrel section 3.

[0054] The connecting and supporting component 5 is arranged between the upper supporting component 41 and the lower supporting component 42, and is formed by splicing a number of second arc-shaped supporting parts 11. The whole is in the shape of a cylinder with the same diameter as the tower barrel. A surrounding component supporting part 14 is arranged on the peripheral wall of the second arc-shaped supporting part 11; the angle of the second arc-shaped supporting part is 90 degrees, and a second circumferential side connecting part 12, that is, a flange, is arranged at each of the two side edge positions. Two openings 10 are arranged on each second circumferential side connecting part 12. The angles of the four connecting and supporting components 5 add up to 360 degrees, and they are bolt-connected to each other through the second circumferential side connecting part 12, that is, the flange, to form a ring to support the wall of the wind turbine tower barrel.

[0055] The surrounding component 6 includes an upper surrounding component 61 and a lower surrounding component 62 with the same structure. Both are formed by splicing a number of third arc-shaped supporting parts 15. The whole is in the shape of a cylinder and covers the outer wall of the tower barrel. The ends of the upper surrounding component 61 and the lower surrounding component 62 are respectively connected to the two side end faces of the surrounding component supporting part 14. The surrounding component 6 is connected to the surrounding component supporting part 14 and encloses to form a whole cylindrical shape covering the outer wall of the tower barrel, so as to form an integral support inside and outside to ensure the structural strength. Overall, the support component 4, the connecting and supporting component 5, and the surrounding component 6 are all installed in the form of multi-segment splicing, which can reduce the dependence on large-scale equipment and reduce the operation difficulty. Through the splicing form, the length and arc length of each connecting structure can be flexibly and reasonably adjusted according to the size of the break, with high flexibility. Specifically, the angle of the third arc-shaped supporting part 15 is 120 degrees, and three third arc-shaped supporting parts 15 are spliced into a 360-degree cylindrical structure. Four third circumferential side connecting parts 16 are arranged at equal intervals at each side edge position of the third arc-shaped supporting part 15, and two openings 10 are arranged on each third circumferential side connecting part 16 for passing through bolts to complete the connection. The first arc-shaped supporting part 7 has a high and narrow structural style, and the second arc-shaped supporting part 11 has a short and wide structural style, so that these two assembled parts can smoothly enter the inside of the tower barrel. The axial lengths of the upper surrounding component 61 and the lower surrounding component 62 are calculated and determined according to the damage condition of the damaged tower barrel section 3. The radian of the third arc-shaped supporting part 15 is the same as that of the wind turbine tower barrel. The third arc-shaped supporting part 15 can closely adhere to the outer wall of the wind turbine tower barrel. The angles of the three outer steel plates 6 add up to 360 degrees, and they are bolt-connected to each other through the third circumferential side connecting part 16, that is, the flange, to form an outer ring to wrap the outer wall of the damaged tower barrel section 3. Each third arc-shaped supporting part 15 is connected to the opening 10 on the surrounding component supporting part 14 through the third end connecting part 17 and then passes through bolts to complete the connection.

[0056] In this embodiment, the axial length of the connecting and supporting component 5 is adapted to the damaged length of the damaged tower barrel section 3. The damaged length of the damaged tower barrel section 3 is repaired and supported through the connecting and supporting component 5, and then a complete support path is formed through the support component 4 to ensure the structural strength.

[0057] In this embodiment, the splicing joints between the first arc-shaped support parts 7 are arranged staggeredly with the splicing joints between the second arc-shaped support parts 11, and the splicing joints between the second arc-shaped support parts 11 are arranged staggeredly with the splicing joints between the third arc-shaped support parts 15. The form of staggered arrangement of the splicing joints can improve the integrity of the assembled structure, enhance the shear and tensile resistance, and ensure the reliability of the repaired fan cylinder section.

[0058] In this embodiment, the arc length of the first arc-shaped support part 7 is less than that of the second arc-shaped support part 11. This setting method is to arrange the splicing joints staggeredly.

[0059] In this embodiment, a plurality of first circumferential side connection parts 9 are arranged along the axial direction at both side edges of the inner wall of the first arc-shaped support part 7. Adjacent first arc-shaped support parts 7 are connected by the first circumferential side connection parts 9 at corresponding positions. First end connection parts 8 are arranged at both ends of the first arc-shaped support part 7, and the first end connection parts 8 are connected to the upper flange 31, the lower flange 32 or the connection support assembly 5. The positions of the holes 10 on the first end connection parts 8 need to correspond to the upper flange 31, the lower flange 32 or the connection support assembly 5, so as to facilitate the connection by passing bolts during installation. The first end connection parts 8 are connected by passing bolts to complete the splicing of adjacent first arc-shaped support parts 7.

[0060] In this embodiment, a plurality of second circumferential side connection parts 12 are arranged at both side edges of the inner wall of the second arc-shaped support part 11. Adjacent second arc-shaped support parts 11 are connected by the second circumferential side connection parts 12. Second end connection parts 13 are arranged at both ends of the second arc-shaped support part 11, and the second end connection parts 13 are connected to the corresponding first end connection parts 8. The second circumferential side connection parts 12 are connected by passing bolts to complete the splicing of adjacent second arc-shaped support parts 11.

[0061] In this embodiment, a plurality of third circumferential side connection parts 16 are arranged at both side edges of the outer wall of the third arc-shaped support part 15. Adjacent third arc-shaped support parts 15 are connected by the third circumferential side connection parts 16. A third end connection part 17 is arranged at one end of the third arc-shaped support part 15 close to the enclosure component support part 14 and is connected to the enclosure component support part 14. The third circumferential side connection parts 16 are connected by passing bolts to complete the splicing of adjacent third arc-shaped support parts 15. The enclosure component support part 14 is used to connect the enclosure component 6. Similarly, the enclosure component support part 14 is provided with holes 10 for bolts to pass through, so that after the holes 10 on the enclosure component support part 14 and the third end connection part 17 are aligned, the splicing is completed by passing bolts.

[0062] In this embodiment, the first end connection part 8, the second end connection part 13, and the third end connection part 17 are all arc-shaped connecting plates, and the plate surface is provided with uniformly arranged openings 10 for aligning and connecting the fixing parts.

[0063] In this embodiment, the first circumferential connection part 9, the second circumferential connection part 12, and the third circumferential connection part 16 are all flanges, and the flanges are provided with openings 10 for aligning and connecting the fixing parts. The openings 10 are bolt holes. After the openings 10 at the corresponding positions are aligned, bolts are passed through to complete the fixed connection. For the materials, the upper intact tower barrel section 1, the lower intact tower barrel section 2, the damaged tower barrel section 3, the upper flange 31, the lower flange 32, the support assembly 4, the upper support assembly 41, the lower support assembly 42, the connecting support assembly 5, the enclosing assembly 6, the upper enclosing assembly 61, the lower enclosing assembly 62, the first arc-shaped support part 7, the first end connection part 8, the first circumferential connection part 9, the second arc-shaped support part 11, the second circumferential connection part 12, the second end connection part 13, the enclosing assembly support part 14, the third arc-shaped support part 15, the third circumferential connection part 16, and the third end connection part 17 are all set as steel plates. According to the usage requirements, the surface needs to be rust-proof treated, and overall, it needs to meet the strength usage requirements.

[0064] According to the second aspect of the present invention, there is provided a repair method for using an assembly structure on a damaged tower barrel of a wind turbine as described above, including the following steps:

[0065] Right the toppled wind turbine tower barrel; specifically, due to an accident, the wind turbine tower barrel topples, causing the tower barrel wall to bend or break, and a hoisting device is used to right the tower barrel.

[0066] Observe the damage condition of the damaged tower barrel section 3 and design the dimensions of the assembly structure used.

[0067] Transport the support assembly 4 into the damaged tower barrel section 3, remove the bolts of the original flange of the damaged tower barrel section 3, and bolt-connect several first arc-shaped support parts 7 and the flange of the intact tower barrel section, so that the upper support assembly 41 and the lower support assembly 42 are fixed inside the damaged tower barrel section 3.

[0068] Solidly connect the first circumferential connection parts 9 of adjacent first arc-shaped support parts 7 by bolts, so that the support assembly 4 forms an inner circle covering the inner wall of the damaged tower barrel section 3.

[0069] First, install a part of the second arc-shaped support portion 11 on the tension-damaged side of the damaged tower barrel section 3. After aligning the openings 10 on the second end connection portion 13 of this part of the second arc-shaped support portion 11 with the openings 10 of the upper support assembly 41 and the lower support assembly 42, fix them with bolts. Then, cut off the damaged tower barrel wall on the bent and compressed side of the damaged tower barrel section 3, and then complete the fixation of the remaining second arc-shaped support portion 11 with the upper support assembly 41 and the lower support assembly 42. Pass bolts through the openings 10 in the second circumferential side connection portion 12 of the adjacent second arc-shaped support portions 11 to complete the fixation, so that the connection support assembly 5 forms a circular support for the tower barrel wall of the fan, and weld the tower barrel wall of the fan and the connection support assembly 5;

[0070] Fix several third arc-shaped support portions 15 by passing bolts through the openings 10 on the corresponding third end connection portions 17 after aligning them with the openings 10 on the enclosure assembly support portion 14, and complete the fixation of the adjacent third arc-shaped support portions 15. Specifically, connect them by passing bolts through the openings 10 on the third circumferential side connection portions 16 at the corresponding positions, so that the enclosure assembly 6 forms an outer ring to wrap the outer wall of the damaged tower barrel section 3;

[0071] Reinstall the fan head that needs to be replaced to make the fan return to normal operation.

[0072] The embodiments of the present invention disclosed above are only used to help illustrate the present invention. The embodiments do not describe all the details in detail, nor limit the invention to the specific embodiments described. According to the content of this specification, many modifications and changes can be made. These embodiments are selected and specifically described in this specification to better explain the principle and practical application of the present invention, so that those skilled in the art can understand and utilize the present invention well.

Claims

1. An assembly structure on a damaged tower barrel of a wind turbine. The tower barrel includes an upper intact tower barrel section (1), a lower intact tower barrel section (2), and a damaged tower barrel section (3), and is characterized in that The assembled structure includes: The support component (4) includes an upper support component (41) and a lower support component (42) with the same structure. Both are formed by splicing a number of first arc-shaped support parts (7) and are in the shape of a cylinder with an outer diameter the same as the inner diameter of the tower barrel. One end of the upper support component (41) away from the connection support component (5) is connected to the upper flange (31) of the upper intact tower barrel section (1), and one end of the lower support component (42) away from the connection support component (5) is connected to the lower flange (32) of the lower intact tower barrel section (2). The connection support component (5) is arranged between the upper support component (41) and the lower support component (42). It is formed by splicing a number of second arc-shaped support parts (11) and is in the shape of a cylinder with the same diameter as the tower barrel. Among them, an enclosure component support part (14) is arranged on the circumferential wall of the second arc-shaped support part (11). The enclosure component (6) includes an upper enclosure component (61) and a lower enclosure component (62) with the same structure. Both are formed by splicing a number of third arc-shaped support parts (15) and are in the shape of a cylinder, covering the outer wall of the tower barrel. The ends of the upper enclosure component (61) and the lower enclosure component (62) are respectively connected to the two end faces of the enclosure component support part (14).

2. The assembled structure on the damaged tower barrel of a fan according to claim 1, wherein: The axial length of the connection support component (5) is adapted to the damaged length of the damaged tower barrel section (3).

3. The assembled structure on the damaged tower barrel of a fan according to claim 1 or 2, characterized in that: The splicing joints between the first arc-shaped support parts (7) and the splicing joints between the second arc-shaped support parts (11) are arranged staggeredly, and the splicing joints between the second arc-shaped support parts (11) and the splicing joints between the third arc-shaped support parts (15) are arranged staggeredly.

4. The assembled structure on the damaged tower barrel of a fan according to claim 3, characterized in that: The arc length of the first arc-shaped support part (7) is less than the arc length of the second arc-shaped support part (11).

5. A splicing structure on a damaged tower barrel of a fan according to claim 1, 2 or 4, characterized in that: A number of first circumferential side connection parts (9) are arranged axially at the two side edges of the inner wall of the first arc-shaped support part (7). Adjacent first arc-shaped support parts (7) are connected through the first circumferential side connection parts (9) at corresponding positions. First end connection parts (8) are arranged at both ends of the first arc-shaped support part (7), and the first end connection parts (8) are connected to the upper flange (31), the lower flange (32) or the connection support component (5).

6. The assembled structure on the damaged tower barrel of a fan according to claim 5, wherein: A number of second circumferential side connection parts (12) are arranged at the two side edges of the inner wall of the second arc-shaped support part (11). Adjacent second arc-shaped support parts (11) are connected through the second circumferential side connection parts (12). Second end connection parts (13) are arranged at both ends of the second arc-shaped support part (11), and the second end connection parts (13) are connected to the corresponding first end connection parts (8).

7. The assembled structure on the damaged tower barrel of a fan according to claim 6, characterized in that: A number of third circumferential side connection parts (16) are arranged at the two side edges of the outer wall of the third arc-shaped support part (15). Adjacent third arc-shaped support parts (15) are connected through the third circumferential side connection parts (16). A third end connection part (17) is arranged at one end of the third arc-shaped support part (15) close to the enclosure component support part (14) and is connected to the enclosure component support part (14).

8. A fitting structure on a damaged tower barrel of a fan according to claim 7, characterized in that: The first end connection part (8), the second end connection part (13) and the third end connection part (17) are all arc-shaped connecting plates, and uniformly arranged openings (10) are provided on the plate surface for aligning and connecting the fixing parts.

9. The assembling structure on a damaged tower barrel of a fan according to claim 7, characterized in that: The first circumferential connection part (9), the second circumferential connection part (12) and the third circumferential connection part (16) are all flanges, and openings (10) are provided on the flanges for aligning and connecting the fixing parts.

10. A repair method using an assembly structure on a damaged tower barrel of a wind turbine as described in claims 1, 2, 4, 6, 7, 8 or 9, characterized in that, It includes the following steps: Right the toppled fan tower barrel. Observe the damage condition of the damaged tower barrel section (3) and design the dimensions of the assembled structure. Transport the support assembly (4) into the damaged tower barrel section (3), remove the bolts of the original flange of the damaged tower barrel section (3), and bolt-connect several first arc-shaped support parts (7) and the flange of the intact tower barrel section, so that the upper support assembly (41) and the lower support assembly (42) are fixed inside the damaged tower barrel section (3). Solidly connect adjacent first arc-shaped support parts (7) so that the support assembly (4) forms an inner ring covering the inner wall of the damaged tower barrel section (3). First install part of the second arc-shaped support parts (11) on the tension-damaged side of the damaged tower barrel section (3). After solidly connecting this part of the second arc-shaped support parts (11) with the upper support assembly (41) and the lower support assembly (42), cut off the damaged tower barrel wall on the bent and compression side of the damaged tower barrel section (3), and then complete the solid connection of the remaining second arc-shaped support parts (11) with the upper support assembly (41) and the lower support assembly (42). Solidly connect adjacent second arc-shaped support parts (11) so that the connection support assembly (5) forms a ring to support the fan tower barrel wall, and weld the fan tower barrel wall and the connection support assembly (5). Solidly connect several third arc-shaped support parts (15) with the enclosure assembly support part (14), and complete the solid connection of adjacent third arc-shaped support parts (15), so that the enclosure assembly (6) forms an outer ring to wrap the outer wall of the damaged tower barrel section (3). Reinstall the fan head that needs to be replaced to make the fan resume normal operation.

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