Switching assembly and wind power truss tower

Abstract

The embodiment of the invention provides a switching assembly and a wind power truss tower. The switching assembly comprises a switching barrel and a switching single body, the switching barrel is provided with a first mounting end and a second mounting end, the first mounting end is used for being connected with a top barrel, the second mounting end comprises a plurality of sub-mounting parts, and the sub-mounting parts define a ring; each transfer single body comprises a first end part and a second end part, the first end part is matched and connected with the sub-mounting part, and the second end part is used for being connected with the matching part of the truss main body; the first end portion is in a prolate shape, the second end portion is in a cylindrical shape or a quasi-cylindrical shape, and the switching single body is in smooth transition from the first end portion to the second end portion. The wind power truss tower comprises the switching assembly, a top barrel and a truss main body, wherein the top barrel is connected with the first mounting end part; the truss body comprises a matching part which is connected with the second end in a matched mode. The switching assembly and the wind power truss tower are used for achieving the effect of reducing fatigue fission and static load fracture risks.

Description

Technical Field

[0001] This application relates to the field of wind power generation technology, and in particular to a transfer component and a wind turbine truss tower. Background Technology

[0002] In wind power systems, the tower, as the core structure supporting the wind turbine, must adapt to complex operating conditions such as wind load, wind turbine nacelle weight, and dynamic vibration. With the increase in the single-unit capacity of wind turbines, such as the emergence of units above 5MW, traditional cylindrical steel towers face challenges in terms of transportation, installation, and economy. Therefore, the wind power industry has gradually adopted truss-type towers as the foundation support for wind turbines.

[0003] The truss-type tower includes a tower with multiple legs, a transition section, and a top circular tower. The top circular tower is used to install the wind turbine nacelle and pitch system. The transition section is used to mount the top circular tower onto the multiple legs. The transition section includes a cylindrical body and a cone mounted on one end of the body. The cone is formed by several plate-like splices. The small end of the cone is threaded to one end of the body, and the large end of the cone is connected to each leg. That is, one end of each plate-like splice is threaded to one end of the body, and the other end of each plate-like splice is welded to a corresponding leg.

[0004] However, the sheet-like spliced ​​structure lacks sufficient strength and is at risk of fatigue cracking and static load fracture. Summary of the Invention

[0005] This application provides a transition component and a wind turbine truss tower to reduce the risk of fatigue cracking and static load fracture.

[0006] In a first aspect, embodiments of this application provide a transition assembly for a wind turbine truss tower. The wind turbine truss tower includes a top cylinder and a truss body. The transition assembly includes: a transition cylinder having a first mounting end and a second mounting end, the first mounting end being used to connect with the top cylinder, and the second mounting end including a plurality of sub-mounting parts that enclose to form a ring; and a transition unit including a first end and a second end, the first end being matched and connected with the sub-mounting parts, and the second end being used to connect with a mating part of the truss body. The first end is elongated and flat, and the second end is cylindrical or quasi-cylindrical. The transition unit smoothly transitions from the first end to the second end.

[0007] In one possible implementation, multiple sub-mounting parts are enclosed to form a ring, and the sub-mounting parts are arc-shaped; the first end is a flat and elongated arc shape, and the first end is matched and connected to the sub-mounting parts.

[0008] In one possible implementation, the number of adapter units is at least three; the number of sub-mounting parts is equal to the number of adapter units; the first end of each adapter unit is connected to each sub-mounting part in a one-to-one correspondence, and the second end of each adapter unit is connected to each mating part in a one-to-one correspondence.

[0009] In one possible implementation, the second mounting end is further provided with notches, the number of which is equal to the number of sub-mounting parts. Two adjacent notches divide the second mounting end into a sub-mounting part, and the sub-mounting part is connected to the first end of a corresponding adapter unit.

[0010] In one possible implementation, the adapter unit is a hollow component that smoothly transitions from the first end to the second end; or, the adapter unit is a solid component that smoothly transitions from the first end to the second end.

[0011] In one possible implementation, the adapter unit is a cast steel component.

[0012] In one possible implementation, the first end is welded to the sub-mounting part.

[0013] Secondly, embodiments of this application provide a wind turbine truss tower, which includes the aforementioned adapter assembly, and further includes: a top cylinder for mounting the turbine head, the top cylinder being connected to a first mounting end; and a truss body, the truss body including a mating part, the mating part being matched and connected to a second end.

[0014] In one possible implementation, the mating part is threaded or welded to the second end.

[0015] In one possible implementation, the top cylinder is threaded or welded to the first mounting end.

[0016] The adapter unit provided in this application embodiment is used to install the top cylinder of a wind turbine truss tower onto the truss body. A first mounting end on the adapter cylinder is used to connect with the top cylinder, and a second mounting end on the adapter cylinder is annular, comprising multiple sub-mounting parts that enclose a ring. By setting the shape of the first end to a flat, elongated shape, the adapter unit can be matched and installed with the sub-mounting parts in the annular second mounting part. By setting the shape of the second end to a cylindrical or near-cylindrical shape, the adapter unit can be connected to the mating part of the truss body. By configuring the adapter unit to smoothly transition from the first end to the second end, the structural strength of the adapter unit itself can be improved, thus reducing or even avoiding the risk of fatigue cracks and static load fracture. Furthermore, by configuring the adapter unit to smoothly transition from the first end to the second end, the cross-sectional shape of the adapter unit changes gradually, and the internal interaction forces of the adapter unit cancel each other out, causing the stress of the adapter unit to approach zero, further reducing the risk of fatigue cracks and static load fracture.

[0017] The wind turbine truss tower provided in this application embodiment has a top cylindrical body for mounting the turbine head, and a truss body for increasing the height of the top cylindrical body and the turbine head mounted on it from the ground. The top cylindrical body is connected to a first mounting end, and the mating part of the truss body is connected to a second end. Thus, the transition assembly mounts the top cylindrical body onto the truss body, achieving reliable installation between the truss body of the truss structure and the top cylindrical body of the cylindrical structure. In the transition assembly, the transition unit has a first end shaped as a flattened elongation, allowing it to match and install with a sub-mounting part in the annular second mounting part. The second end is cylindrical or near-cylindrical, allowing it to connect with the mating part of the truss body. Furthermore, by configuring the transition unit to smoothly transition from the first end to the second end, the structural strength of the transition unit itself is improved, thus reducing or even avoiding the risk of fatigue cracks and static load fracture. Furthermore, by configuring the transition unit to transition smoothly from the first end to the second end with different shapes, the cross-sectional shape of the transition unit changes slowly and gradually. The interaction forces inside the transition unit cancel each other out, and the stress of the transition unit tends to zero, which also reduces the risk of fatigue cracks and static load fracture. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0019] Figure 1This is a structural schematic diagram of the wind turbine truss tower provided in this application;

[0020] Figure 2 A partial structural schematic diagram of the wind turbine truss tower provided in this application;

[0021] Figure 3 A schematic diagram of the structure of the adapter component provided in this application;

[0022] Figure 4 This is a schematic diagram of the structure of the adapter unit provided in this application.

[0023] Figure label:

[0024] 100: Adapter assembly; 110: Adapter body; 111: First mounting end; 112: Second mounting end; 113: Sub-mounting part; 114: Notch; 120: Adapter unit; 121: First end; 122: Second end;

[0025] 200: Top cylinder;

[0026] 300: Truss main body; 301: Fitting part; 302: Support leg.

[0027] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0028] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0029] First, let me explain the terms used in this application:

[0030] Structural nodes, also known as structural nodes, are key elements in a building's structural system. They connect two or more structural members, transferring forces and moments, and are crucial for ensuring structural stability and safety. Nodes come in various types and forms, selectable based on different building requirements and structural characteristics. Structural nodes not only bear vertical and horizontal loads but also transfer bending moments and shear forces. The design and construction of nodes affect not only the reliability and safety of the structure's load-bearing capacity but also the quality of component fabrication and on-site installation, directly influencing the structure's cost.

[0031] Wind turbine nacelle: A housing that houses and protects the wind turbine's main shaft, gearbox, generator, transmission system, and other electrical equipment. It is typically made of lightweight, high-strength, and corrosion-resistant fiberglass.

[0032] Pitch control system: This is a key control device for wind turbine generators, which controls the output power by adjusting the blade pitch angle.

[0033] Truss: A structure consisting of several members connected to each other at both ends by hinges.

[0034] Secondly, a detailed analysis of the problems with existing technologies is conducted.

[0035] Currently, the wind power industry is increasingly adopting truss-type towers as the foundation support for wind turbines. A truss-type tower consists of a tower with multiple legs, a transition section, and a top circular tower. The top circular tower is used to install the wind turbine nacelle and pitch system, while the transition section is used to mount the top circular tower onto the multiple legs.

[0036] In the first embodiment of the prior art, the transition section is formed by a combination of steel and concrete, specifically including an outer pot shell and an inner pot shell, with the inner pot shell fitted inside the outer pot shell, and concrete filling the space between the inner and outer pot shells. The outer pot shell has a square ring structure, with an inwardly extending top plate on its top surface. A mounting hole is located in the center of the top plate, through which the inner pot shell is fitted inside the outer pot shell. The outer pot shell also has various reinforcing ribs to increase the structural strength of the transition section. Circular connecting flanges are located at the four corners of the outer pot shell, through which columnar corner posts are mounted. These corner posts are threadedly connected to the support legs of the prior art. A mounting flange is located on the top plate of the outer pot shell, through which the outer pot shell is connected to the flange of the top circular tower. However, while this embodiment of the prior art reduces the amount of steel used, it results in complex structural stress, a large structural weight, an upward shift of the center of gravity, and unfavorable seismic loads. Seismic loads can cause the initiation, propagation, and even interconnection of microcracks within the concrete, ultimately leading to a decrease in macroscopic mechanical properties. In summary, the use of a combination of steel and concrete in the transition section is also not conducive to wind turbines with large single-unit capacity.

[0037] Therefore, in the second embodiment of the prior art, the transition section is a cylindrical structure. The legs are made of structural steel, and each leg is equipped with two fixing plates. The first end of each fixing plate is connected to the same corresponding leg, and the second end of each fixing plate is connected to the transition section. The first end of the transition section is connected to the top cylindrical tower via a flange structure, and the outer wall of the transition section is connected to the second end of the fixing plate. In this embodiment, although the fixing plates increase the contact area between the legs and the transition section, making the connection between the legs and the transition section more reliable, the presence of two fixing plates between the transition section and each leg results in more structural nodes, increased stress complexity, and increased construction difficulty and cost. Moreover, the transition section and the fixing plates are connected by a large number of bolts, with the bolt axis approximately perpendicular to the direction of gravity. The bolts need to withstand large fatigue loads, and the fatigue bearing capacity of the bolts is too low, which indirectly leads to a reduction in the fatigue bearing capacity of the entire truss tower.

[0038] Therefore, in the third embodiment of the prior art, the transition section is a one-piece structure and is cast. This transition section includes a cylindrical body and a mounting plate disposed at one end of the cylindrical body. One end of the cylindrical body has a triangular-like structure, and the other end is annular. The other end of the cylindrical body connects to the top circular tower. The mounting plate also matches this triangular shape, and has three mounting holes near its three apex positions. Each mounting hole is surrounded by a flange mounting structure, and the mounting plate is connected to three support leg flanges through the flange mounting structures near the three mounting holes. However, this prior art solution has very high requirements for the casting process, significantly increasing casting costs.

[0039] Therefore, in the fourth embodiment of the prior art, the transition section includes a cylindrical body and a cone installed at one end of the body. The cone is formed by several sheet-like splicing bodies. The small end of the cone is connected to one end of the body by a thread, and the large end of the cone is connected to each leg. Each sheet-like splicing body constituting the cone is welded to a corresponding leg.

[0040] The sheet-like splice body has a sheet-like structure, while the legs are cylindrical. During welding, due to the limited welding points between the splice body and the legs, numerous tie rods are typically installed between them. The ends of each tie rod are welded to both the splice body and the legs to ensure the connection strength. Furthermore, due to the shape limitations of the sheet-like splice body, its inherent strength is insufficient; therefore, numerous reinforcing ribs are also required on the side walls to guarantee its overall strength.

[0041] In the aforementioned prior art, there are a large number of welds, and many of these welds are fillet welds. For example, the welds between the sheet-like splice and the leg, the welds between the sheet-like splice and the tie rod, and the welds between the tie rod and the leg all have stress concentration problems. These stress concentration problems also lead to insufficient fatigue load bearing capacity at the connection position between the transition section and the leg. To solve this problem, the prior art uses stress concentration relief holes at the ends of the welds to reduce stress concentration problems at the welds.

[0042] However, in the aforementioned existing technologies, the weld locations are scattered and complex, requiring the installation of stress concentration relief holes, which significantly increases the workload during the welding process. Furthermore, this approach is not conducive to cost-effectiveness or reducing manual labor during actual installation. Moreover, the use of stress concentration relief holes is ineffective in addressing stress concentration issues, as stress concentration problems still exist at the weld locations.

[0043] Furthermore, in the aforementioned existing technology, the small end of the cone is connected to one end of the main body via a threaded connection. Since the truss-type tower is used to install wind turbines, and wind turbines are not only heavy but also subject to constantly changing wind loads in natural wind fields, the load on the bolts between the cone and the main body varies frequently. Therefore, the bolts between the cone and the main body are not only prone to loosening but also need to withstand fatigue loads. This necessitates regular checks of bolt tightness by maintenance personnel during later use, increasing maintenance costs. In fact, a large number of bolts are used between the small end of the cone and the main body to ensure reliable connection. This increased number of bolts further increases the workload of maintenance personnel and raises future maintenance costs.

[0044] Based on the above scenarios, it can be seen that in the existing technology, the use of sheet-like splices results in insufficient structural strength, and the presence of welds on the sheet-like splices leads to stress concentration, all of which greatly increase the risk of fatigue cracking and static load fracture.

[0045] The adapter assembly and wind turbine truss tower provided in this application, by configuring the first end of the adapter unit in the adapter assembly to be flat and elongated to achieve a matching connection with the adapter cylinder, reduce or even avoid the need to increase the connection strength between the adapter unit and the adapter cylinder by welding tie rods. By configuring the second end to be cylindrical or quasi-cylindrical to achieve a matching connection with the mating part of the truss body, reduce or even avoid the need to increase the connection strength between the adapter unit and the truss body by welding tie rods. In this way, welds are reduced or even avoided on the adapter unit, thereby reducing or even avoiding the problem of stress concentration on the adapter unit. By configuring the adapter unit to have a smooth transition from the first end to the second end, the structural strength of the adapter unit itself can be improved, thus reducing or even avoiding the risk of fatigue cracks and static load fracture.

[0046] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0047] Figure 1 This is a structural schematic diagram of the wind turbine truss tower provided in this application. Figure 2 A partial structural schematic diagram of the wind turbine truss tower provided in this application is shown below. Figure 1 and Figure 2 As shown, the wind turbine truss tower includes a top cylindrical section 200 and a truss body 300. The top cylindrical section 200 is used to install the turbine head, and the truss body 300 is used to increase the height of the top cylindrical section 200 and the turbine head installed on the top cylindrical section 200 from the ground, thereby ensuring that the blade edges of the wind turbine blades installed on the turbine head do not interfere with the ground during operation. The wind turbine truss tower also includes a transition assembly 100, which is used to install the cylindrical top cylindrical section 200 onto the truss body 300 of the truss structure.

[0048] Figure 3 A schematic diagram of the structure of the adapter component provided in this application is shown below. Figure 3 As shown, the adapter assembly 100 includes an adapter cylinder 110 and an adapter unit 120.

[0049] like Figure 2 and Figure 3As shown, the adapter cylinder 110 has a first mounting end 111 and a second mounting end 112. The first mounting end 111 is used to connect to the top cylinder 200, and the second mounting end 112 includes a plurality of sub-mounting parts 113, which enclose a ring. The adapter cylinder 110 can be welded from a single sheet of steel. The first mounting end 111 and the second mounting end 112 can be portions of the cylinder structure near the two ends of the extension direction of the adapter cylinder 110. Obviously, both the first mounting end 111 and the second mounting end 112 are annular in shape. The first mounting end 111 and the second mounting end 112 can also be protruding flange structures provided at both ends of the adapter cylinder 110, with the flange structures protruding from the sidewall of the middle section of the adapter cylinder 110. The plurality of sub-mounting parts 113 can be spaced apart, that is, the plurality of sub-mounting parts 113 are arranged in a ring with gaps between each pair. Multiple sub-mounting parts 113 can also be connected together. That is, multiple sub-mounting parts 113 can be connected into a ring by welding, splicing or other connection methods, with no gaps between each pair. Multiple sub-mounting parts 113 can also be integrally formed into a ring, with no physical structure to distinguish the multiple sub-mounting parts 113, only artificial functional area division.

[0050] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the adapter unit 120 includes a first end 121 and a second end 122. The first end 121 is mated and connected to the sub-mounting part 113, and the second end 122 is used to connect to the mating part 301 of the truss body 300. The first end 121 is mated and connected to the sub-mounting part 113, meaning that the shape and size of the first end 121 match the shape and size of the sub-mounting part 113, and the first end 121 and the sub-mounting part 113 are connected. Similarly, the second end 122 is connected to the mating part 301 of the truss body 300, also meaning that the shape and size of the second end 122 match the shape and size of the mating part 301, and the second end 122 and the mating part 301 are connected.

[0051] The adapter assembly 100 is part of the wind turbine truss tower. The wind turbine truss tower actually has a slight sway. When the first end 121 and the sub-mount 113 are threaded together, the slight sway of the wind turbine truss tower will cause the bolts at the threaded connection to loosen. This requires maintenance personnel to climb up the very high truss tower regularly for manual inspection, which increases labor costs and safety risks for maintenance personnel.

[0052] For example, welding the first end 121 to the sub-mounting part 113 allows for a reliable connection between the first end 121 and the sub-mounting part 113, and the subsequent maintenance cost is lower than that of a threaded connection. Moreover, welding the first end 121 to the sub-mounting part 113 results in a simpler structure for both the first end 121 and the sub-mounting part 113 compared to a threaded connection, effectively reducing manufacturing costs.

[0053] It should be noted that the connection strength requirement between the first end 121 and the sub-mounting part 113 is the same as the strength requirement of the transition unit 120 itself. Therefore, the shape and size of the first end 121 match the shape and size of the sub-mounting part 113. When welding the first end 121 and the sub-mounting part 113, a stress relief groove needs to be provided at the weld position between the first end 121 and the sub-mounting part 113 to reduce stress concentration at the weld position, thereby meeting the structural strength requirements of the structural nodes at the positions of the first end 121 and the sub-mounting part 113.

[0054] In some embodiments, the sub-mounting part 113 is provided with a plug groove, the opening of the plug groove is away from the first mounting end 111, the first end 121 is inserted into the plug groove, and the position where the end face of the sub-mounting part 113 intersects with the side wall of the first end 121 is the welding position.

[0055] In other embodiments, the first end 121 is a flat, elongated arc-shaped ring, and the sub-mounting part 113 is inserted into the first end 121. The position where the end face of the first end 121 intersects with the side wall of the sub-mounting part 113 is the welding position.

[0056] In some other embodiments, the first end portion 121 is a flat, elongated arc-shaped piece. The first end portion 121 is attached to the outer arc wall or inner arc wall of the sub-mount portion 113. The intersection of the end face of the first end portion 121 with the side wall of the sub-mount portion 113, the intersection of the end face of the sub-mount portion 113 with the side wall of the first end portion 121, and the intersection of the side wall of the first end portion 121 with the side wall of the sub-mount portion 113 are the welding positions.

[0057] In some other embodiments, the first end 121 is a flat and elongated arc-shaped piece, and the end face of the first end 121 is attached to the end face of the sub-mounting part 113. The attachment position of the first end 121 and the sub-mounting part 113 is a welding position.

[0058] For example, the adapter unit 120 is a solid component with a smooth transition from the first end 121 to the second end 122. The solid nature of the adapter unit 120 allows for the selection of materials and manufacturing processes based on actual usage requirements. This increases the strength of the adapter unit 120, reliably supporting the adapter cylinder 110, the top cylinder 200 mounted on the adapter cylinder 110, and the machine head mounted on the top cylinder 200. Furthermore, the solid nature of the adapter unit 120 also increases its rigidity, enabling it to withstand the torque and load it bears, thereby improving the safety and reliability of the adapter unit 120.

[0059] For example, such as Figure 4 As shown, the transition unit 120 is a hollow component that smoothly transitions from the first end 121 to the second end 122. The term "hollow component" refers to at least the intermediate section defined by the first end 121 and the second end 122 of the transition unit 120, which encloses a hollow region. This intermediate section is a structural entity with a certain wall thickness. The hollow design of the transition unit 120 allows for selection of its wall thickness, material, and manufacturing process according to actual usage requirements. This reduces material waste, improves economic value, reduces weight, lowers the center of gravity, and reduces the impact of seismic loads on the overall truss tower structure. Furthermore, although the transition unit 120 is hollow, the hollow structure effectively disperses and transfers external forces. Under load, stress can be rationally distributed, avoiding stress concentration. Therefore, the hollow design of the transition unit 120 can still meet the strength requirements of the transition unit 120.

[0060] For example, the adapter unit 120 is made of cast steel. Cast steel generally has better fatigue resistance than cast iron, effectively bearing the fatigue loads of the adapter cylinder 110, the top cylinder 200 mounted on the adapter cylinder 110, and the machine head mounted on the top cylinder 200, thus extending the fatigue life of the adapter unit 120. Clearly, using high-fatigue-strength cast steel for the adapter unit 120 allows for more effective bearing of fatigue loads and extends its fatigue life.

[0061] In some examples, the adapter unit 120 and the adapter cylinder 110 are welded together. The adapter unit 120 is made of cast steel, while the adapter cylinder 110 is welded from steel plates. The adapter unit 120 is located in a high-stress area during actual use, while the connection point between the adapter unit 120 and the adapter cylinder 110, and the adapter cylinder 110, are located in a low-stress area. The fatigue load-bearing capacity of the cast steel adapter unit 120 is greater than that of the weld between the adapter unit 120 and the adapter cylinder 110, and also greater than that of the adapter cylinder 110. This is consistent with the actual load-bearing situation where the adapter unit 120 bears a higher fatigue load, the area between the adapter cylinder 110 and the adapter unit 120 bears a lower fatigue load, and the adapter cylinder 110 bears an even lower fatigue load. Thus, not only is the fatigue load-bearing capacity of the adapter assembly 100 improved, increasing its service life, but the manufacturing cost of the adapter assembly 100 is also reduced, as well as the subsequent maintenance cost, improving operation and maintenance efficiency.

[0062] The first end 121 is elongated and flat, while the second end 122 is cylindrical or quasi-cylindrical. The transition unit 120 smoothly transitions from the first end 121 to the second end 122. The first end 121 is elongated and flat, meaning that in a cross-section perpendicular to the length of the transition unit 120, the cross-section of the first end 121 is slender. The second end 122 is cylindrical or quasi-cylindrical. Quasi-cylindrical refers to a shape similar to a cylinder, but it may not be perfectly regular or perfect. For example, its shape may resemble a cylinder, but it may have slight bending or twisting deformation; the sidewalls may not be perfectly smooth, showing slight depressions or protrusions; the end face may not be perfectly flat, showing slight curvature; or the end face may not be perfectly perpendicular to the side surface, showing slight inclination relative to the theoretically perpendicular plane. Clearly, quasi-cylindrical includes structures with an elliptical cross-section. For example, when the adapter unit 120 is the hollow part described above, the middle region of the second end 122 can also be hollow. In this case, the shape of the second end 122 is a hollow cylinder or a near-cylindrical shape. That is, the cross-sectional shape of the second end 122 can be an annular or a near-annular shape.

[0063] like Figure 4As shown, the transition unit 120 smoothly transitions from the first end 121 to the second end 122. The sidewall of the transition unit 120 is composed of multiple arc surfaces with different curvatures, arc lengths, and radii that smoothly transition, avoiding the appearance of protruding edges, sharp corners, and abrupt missing areas. This ensures that the cross-sectional shapes of adjacent positions of the transition unit 120 are similar in size and shape, and the forces between the various parts inside the transition unit 120 cancel each other out. As a result, the area where stress concentration occurs inside the transition unit 120 tends to be zero, and the magnitude of the stress when stress concentration occurs tends to be zero. This improves the structural safety and mechanical connectivity of the transition unit 120 and reduces the risk of fatigue cracks and static load fracture. In the actual design process, the different shapes and dimensions of the first end 121 and the second end 122 of the transition unit 120 can be used as the design basis. Finite element analysis can be used to optimize the specific parameters of the side wall surface of the transition unit 120, so as to achieve a smooth transition of the transition unit 120 from the first end 121 to the second end 122. The optimization objective is for the transition unit 120 to meet the requirements of ultimate strength and fatigue strength.

[0064] The adapter assembly 100 of this application is used to connect the top cylinder 200 of the wind turbine truss tower and the truss body 300. By configuring the first end 121 of the adapter unit 120 in the adapter assembly 100 to be elongated and flat to achieve a matching connection with the adapter cylinder 110, the connection strength between the adapter unit 120 and the adapter cylinder 110 is reduced or even avoided by welding tie rods. The second end 122 is configured to be cylindrical or quasi-cylindrical to achieve a matching connection with the mating part 301 of the truss body 300, reducing or even avoiding the connection strength between the adapter unit 120 and the mating part 301 of the truss body 300 by welding tie rods. Thus, the presence of welds on the adapter unit 120 is reduced or even avoided, thereby reducing or even avoiding stress concentration problems caused by the aforementioned welds on the adapter unit 120. This reduces the risk of fatigue cracks and static load fracture. Furthermore, configuring the transition unit 120 to smoothly transition from the first end 121 to the second end 122 can enhance the structural strength of the transition unit 120 itself, thereby reducing or even avoiding the risk of fatigue cracks and static load fracture. In addition, by configuring the transition unit 120 to smoothly transition from the first end 121 to the second end 122, the transition unit 120 can naturally and smoothly transition from the different shapes of the first end 121 to the second end 122. The cross-sectional shape of the transition unit 120 changes slowly and gradually, the internal interaction forces of the transition unit 120 cancel each other out, the stress of the transition unit 120 tends to zero, and the risk of fatigue cracks and static load fracture is reduced.

[0065] In some embodiments, multiple sub-mounting portions 113 are arranged to form a ring. The sub-mounting portions 113 are arc-shaped, and obviously, the curvature of the arc shape of the sub-mounting portions 113 is equal to the curvature of the ring formed by the multiple sub-mounting portions 113. The first end portion 121 is a flat, elongated arc shape, and the first end portion 121 is matched and connected to the sub-mounting portions 113. Arranging the multiple sub-mounting portions 113 to form a ring makes the shape of the second mounting end portion 112 formed by the sub-mounting portions 113 more similar to or identical to that of the adapter cylinder 110, and the sub-mounting portions 113 are easier to manufacture. Setting the first end portion 121 as a flat, elongated arc shape and the sub-mounting portions 113 as arc-shaped, and matching and connecting the first end portion 121 and the sub-mounting portions 113, makes the first end portion 121 and the sub-mounting portions 113 easier to install.

[0066] In the above embodiments, the curvature of the arc shape of the first end 121 and the curvature of the arc shape of the sub-mounting part 113 can be equal. In this case, the end faces of the first end 121 and the corresponding sub-mounting part 113 are fitted together and connected. Alternatively, the curvature of the arc shape of the first end 121 and the curvature of the arc shape of the sub-mounting part 113 can be unequal. When the curvature of the first end 121 is greater than the curvature of the arc shape of the sub-mounting part 113, the first end 121 is located on one side of the inner wall surface of the sub-mounting part 113 and is connected together. The inner wall surface of the sub-mounting part 113 is the wall surface close to the interior of the adapter cylinder 110. When the curvature of the first end 121 is less than the curvature of the arc shape of the sub-mounting part 113, the first end 121 is located on one side of the outer wall surface of the sub-mounting part 113 and is connected together. The outer wall surface of the sub-mounting part 113 is the wall surface away from the interior of the adapter cylinder 110.

[0067] like Figure 2 As shown, the number of transition units 120 is at least three, the number of sub-mounting parts 113 is equal to the number of transition units 120, and the number of transition units 120 is equal to the number of mating parts 301 provided on the truss body 300 in the wind turbine truss tower. The first end 121 of each transition unit 120 is connected to the sub-mounting part 113 in a one-to-one correspondence, and the second end 122 of each transition unit 120 is connected to each mating part 301 in a one-to-one correspondence. In this embodiment, the at least three transition units 120 are connected to the corresponding arc-shaped mating parts 301 and sub-mounting parts 113 in a one-to-one correspondence, which allows the transition cylinder 110 to be installed on the truss body 300 more reliably, thereby making the installation of the top cylinder 200 installed on the transition cylinder 110 and the turbine head installed thereon more reliable. Obviously, at least three can be three, four, five, etc.

[0068] like Figure 2 and Figure 3As shown, the second mounting end 112 is also provided with a notch 114. The number of notches 114 is equal to the number of sub-mounting parts 113. Two adjacent notches 114 divide the second mounting end 112 into a sub-mounting part 113. Obviously, the number of notches 114 is equal to the number of adapter units 120. The notches 114 and sub-mounting parts 113 are spaced apart, and the sub-mounting part 113 is connected to the first end 121 of a corresponding adapter unit 120. The notch 114 is an exemplary unloading groove at the weld position of the first end 121 and the sub-mounting part 113. By providing the notch 114 at the second mounting end 112, the stress concentration at the weld position of the second mounting end 112 and the first end 121 of the adapter unit 120 can be reduced during welding, and the force at the weld of the second mounting end 112 can be transferred to the entire adapter cylinder 110. In this way, the fatigue load requirements are met, and the fatigue life is increased.

[0069] like Figure 1 and Figure 2 As shown, in the aforementioned wind turbine truss tower, the top cylinder 200 is connected to the first mounting end 111, and the truss body 300 includes a mating part 301, which is matched and connected to the second end 122. Thus, the adapter assembly 100 mounts the top cylinder 200 onto the truss body 300.

[0070] like Figure 1 and Figure 2 As shown, the truss body 300 includes a plurality of legs 302. A mating part 301 is disposed at the free end of each leg 302. The adapter unit 120 is connected to the legs 302 of the truss body 300 through the connection of the mating part 301 and the second end 122. For example, the legs 302 can be formed from the members forming the truss body 300. The legs 302 are elongated members, and when the truss body 300 is in the installed state, the legs 302 are located at the uppermost end of the truss body 300, with the free end of the legs 302 at the top and the constrained end at the bottom. The constrained end of the legs 302 refers to the end that has a constrained connection with the members in the truss body 300.

[0071] For example, the shape of the mating part 301 matches the shape of the second end 122. For instance, if the second end 122 is cylindrical, the shape of the mating part 301 is also cylindrical; if the second end 122 is quasi-cylindrical, the shape of the mating part 301 is also quasi-cylindrical. This makes it easier to install the mating part 301 and the second end 122.

[0072] For example, the mating part 301 is welded to the second end 122. Welding the mating part 301 to the second end 122 reduces manufacturing and maintenance costs, as well as safety risks for maintenance personnel. During the actual installation of the wind turbine truss tower, welding materials matching the chemical composition and mechanical properties of the transition unit 120, such as low-hydrogen welding electrodes, can be selected to ensure the crack resistance and mechanical properties of the weld. Furthermore, in addition to routine processes such as workpiece cleaning, preheating, and post-weld heat treatment during welding, a symmetrical welding sequence can be used to further reduce welding deformation and stress. Of course, the mating part 301 and the second end 122 can also be threaded together, as long as the mechanical requirements are met.

[0073] For example, the top cylinder 200 is welded to the first mounting end 111. Welding the top cylinder 200 and the first mounting end 111 can reduce manufacturing and maintenance costs, as well as safety risks for maintenance personnel. During the actual installation of the wind turbine truss tower, welding materials matching the chemical composition and mechanical properties of the transition cylinder 110, such as low-hydrogen welding electrodes, can be selected to ensure the crack resistance and mechanical properties of the weld. Furthermore, in addition to routine processes such as workpiece cleaning, preheating, and post-weld heat treatment during welding, a symmetrical welding sequence can be used to further reduce welding deformation and stress. Of course, the top cylinder 200 and the first mounting end 111 can also be threaded together.

[0074] The wind power truss tower provided in this application embodiment, during the installation process, firstly, the truss body 300 is installed on the ground, then the adapter component 100 is installed on the truss body 300, and then the top cylinder 200 is installed on the adapter component 100. In this way, the top cylinder 200 is installed on the truss body 300 through the adapter component 100.

[0075] The wind turbine truss tower provided in this application, by using the aforementioned transition assembly, can enhance the structural strength of the transition unit itself, thereby reducing or even avoiding the risk of fatigue cracks and static load fracture. Furthermore, the gradual change in the cross-sectional shape of the transition unit causes the internal interaction forces to cancel each other out, bringing the stress in the transition unit closer to zero, further reducing the risk of fatigue cracks and static load fracture.

[0076] This application embodiment also provides a wind turbine generator, which includes the aforementioned wind turbine truss tower. Obviously, the wind turbine truss tower includes the aforementioned adapter component 100. Since the wind turbine generator provided in this embodiment uses the aforementioned adapter component 100, the beneficial effects of the aforementioned adapter component 100 can also be achieved.

[0077] Finally, it should be noted that other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A transition assembly for a wind turbine truss tower, the wind turbine truss tower comprising a top cylindrical section (200) and a truss body (300), characterized in that, include: The adapter cylinder (110) has a first mounting end (111) and a second mounting end (112). The first mounting end (111) is used to connect with the top cylinder (200). The second mounting end (112) includes a plurality of sub-mounting parts (113), which enclose to form a ring. The adapter unit (120) includes a first end (121) and a second end (122). The first end (121) is matched and connected to the sub-mounting part (113), and the second end (122) is used to connect to the mating part (301) of the truss body (300). The first end (121) is flat and elongated, and the second end (122) is cylindrical or near-cylindrical. The adapter unit (120) smoothly transitions from the first end (121) to the second end (122).

2. The adapter assembly according to claim 1, characterized in that, The multiple sub-mounting parts (113) are arranged to form a circular ring, and the sub-mounting parts (113) are arc-shaped; The first end (121) is a flat and elongated arc shape, and the first end (121) and the sub-mounting part (113) are matched and connected.

3. The adapter assembly according to claim 1, characterized in that, The number of the adapter units (120) is at least three; The number of the sub-mounting parts (113) is equal to the number of the adapter units (120); The first end (121) of each of the adapter units (120) is connected to each of the sub-mounting parts (113) in a one-to-one correspondence, and the second end (122) of each of the adapter units (120) is used to connect to each of the mating parts (301) in a one-to-one correspondence.

4. The adapter assembly according to claim 3, characterized in that, The second mounting end (112) is also provided with a notch (114), the number of which is equal to the number of the sub-mounting parts (113). Two adjacent notches (114) divide the second mounting end (112) into a sub-mounting part (113), and the sub-mounting part (113) is connected to the first end (121) of a corresponding adapter unit (120).

5. The adapter assembly according to any one of claims 1-4, characterized in that, The adapter unit (120) is a hollow component that smoothly transitions from the first end (121) to the second end (122); or, The adapter unit (120) is a solid part that smoothly transitions from the first end (121) to the second end (122).

6. The adapter assembly according to any one of claims 1-4, characterized in that, The adapter unit (120) is a cast steel part.

7. The adapter assembly according to any one of claims 1-4, characterized in that, The first end (121) is welded to the sub-mounting part (113).

8. A wind turbine truss tower, characterized in that, Including the adapter assembly according to any one of claims 1-7, further comprising: A top cylinder (200) is used to mount the machine head, and the top cylinder (200) is connected to the first mounting end (111); The truss body (300) includes a mating part (301) that is matched and connected to the second end (122).

9. The wind turbine truss tower according to claim 8, characterized in that, The mating part (301) is threaded or welded to the second end (122).

10. The wind turbine truss tower according to claim 8, characterized in that, The top cylinder (200) is threaded or welded to the first mounting end (111).

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