Generator frame and wind turbine generator system

Abstract

The present disclosure relates to a generator frame and a wind turbine generator set, the generator frame comprising: two main beams extending along a first direction, the two main beams being spaced apart along a second direction, the first direction and the second direction being perpendicular; a mounting platform located at one end of the main beams along the first direction, the mounting platform being connected with the two main beams, the mounting platform being provided with a base for connecting with a generator; a first inclined beam group comprising a first inclined beam and a second inclined beam, one end of the first inclined beam being connected with one of the main beams, one end of the second inclined beam being connected with the other main beam, the other end of the first inclined beam and the other end of the second inclined beam being connected with the mounting platform, and the length direction of the first inclined beam intersecting with the length direction of the second inclined beam. The technical scheme provided by the present disclosure can improve the load resistance capacity.

Description

Technical Field

[0001] This disclosure relates to the technical field of wind turbine generator sets, and particularly to a generator frame and a wind turbine generator set. Background Technology

[0002] When a wind turbine rotor is subjected to wind loads, it will generate unbalanced loads, causing the nacelle to sway periodically, which in turn causes the generator frame to be subjected to acceleration and angular acceleration loads in different directions.

[0003] However, most existing generator frames are simply welded together from the main beam and the mounting platform, resulting in poor load-bearing capacity. Under complex working conditions, this can easily cause the generator frame to sway or even be damaged. Summary of the Invention

[0004] The purpose of this disclosure is to provide a generator frame and a wind turbine generator set that can improve load-bearing capacity.

[0005] According to one aspect of this disclosure, a generator frame is provided, the generator frame comprising: two main beams extending along a first direction, the two main beams being spaced apart along a second direction, the first direction and the second direction being perpendicular; a mounting platform located at one end of the main beams along the first direction and connected to the two main beams, the mounting platform being provided with a base for connection to a generator; and a first inclined beam group comprising a first inclined beam and a second inclined beam, one end of the first inclined beam being connected to one of the main beams, one end of the second inclined beam being connected to the other main beam, the other ends of the first inclined beam and the other ends of the second inclined beam being connected to the mounting platform, and the length direction of the first inclined beam intersecting the length direction of the second inclined beam.

[0006] The technical solution provided in this disclosure adds a first inclined beam and a second inclined beam to the generator frame, and makes the length direction of the first inclined beam intersect with the length direction of the second inclined beam, so that a triangular stable structure can be formed between the main beam, the inclined beam and the mounting platform. The triangular stable structure can effectively absorb and resist torsional deformation, significantly reduce the internal shear stress generated when the generator frame sways from side to side, improve the load resistance, and thus improve the structural stability of the mounting platform and the generator after installation.

[0007] Optionally, the mounting platform is detachably connected to the two main beams; one end of the first inclined beam is detachably connected to one of the main beams, one end of the second inclined beam is detachably connected to the other main beam, and the other ends of the first and second inclined beams are detachably connected to the mounting platform.

[0008] The above-described design utilizes detachable connections between the main beam, mounting platform, and first inclined beam assembly. This facilitates independent processing and transportation of each component, reducing the difficulty of transporting and manufacturing the generator frame and allowing for more flexible on-site assembly. Furthermore, during subsequent maintenance, damaged components can be replaced individually without requiring a complete replacement, reducing maintenance costs. Additionally, it facilitates subsequent generator dismantling by removing the mounting platform, first inclined beam, and second inclined beam, creating a disassembly and assembly space between the two main beams. This space allows the generator to be vertically lifted and lowered to the ground.

[0009] Optionally, the first inclined beam and the second inclined beam originate from the corresponding main beam and converge inward, converging in the middle region of the installation platform along the second direction.

[0010] With the above design, the first and second inclined beams originate from their respective main beams and converge inwards, meeting at the middle area of ​​the mounting platform along the second direction, forming a "figure-eight" layout. This figure-eight layout creates a triangular stable structure between the main beams, inclined beams, and the mounting platform. This triangular stable structure effectively absorbs and resists torsional deformation, significantly reducing the internal shear stress generated when the generator frame sways from side to side, improving load-bearing capacity, and thus enhancing the structural stability of the mounting platform and generator after installation. Simultaneously, it avoids the problem of interference between the first and second inclined beams, resulting in a simple structure.

[0011] Optionally, the other ends of the first inclined beam and the other ends of the second inclined beam are spaced apart along the second direction; or, the other ends of the first inclined beam and the other ends of the second inclined beam abut against each other.

[0012] Optionally, the first inclined beam and the second inclined beam intersect.

[0013] Optionally, a first reinforcing rib group is provided on the main beam near the end away from the mounting platform; and / or, a second reinforcing rib group is provided on the main beam between the first reinforcing rib group and the mounting platform.

[0014] By implementing the above solution and setting the first stiffening rib group, the local bending stiffness of the area can be increased, avoiding local buckling or excessive stress, reducing the local high stress generated when the generator frame sways up and down under Wy load, and improving the overall stability and service life of the structure.

[0015] Optionally, the installation platform includes at least two sub-beams; the sub-beams extend along the second direction, and both ends of the sub-beams are detachably connected to the two main beams, with the at least two sub-beams arranged at intervals along the first direction.

[0016] Through the above scheme, the secondary beam connects the two main beams, providing the necessary lateral stiffness and stability. Simultaneously, the secondary beam also connects to the first inclined beam group and the subsequent second inclined beam group, serving as a pivot for force conversion and distribution. When the secondary beam rests on the main beam, it significantly improves the vertical flexural stiffness of the generator frame, resisting flexural deformation caused by vertical loads.

[0017] Optionally, a third set of reinforcing ribs is provided on the main beam near the overlap between the main beam and the secondary beam.

[0018] Through the above scheme, the intersection of the secondary beam and the main beam is the key hub for the three-dimensional transformation of force flow. The third stiffening rib group, as an internal compressive support column, enhances the local stiffness of this node, ensuring that the vertical load brought by the secondary beam can be transferred to the bottom main beam without loss, avoiding local compressive collapse.

[0019] Optionally, there are two sub-beams and four bases, with each sub-beam welded to two bases; the first inclined beam and the second inclined beam are each detachably connected to two of the sub-beams.

[0020] Compared to the detachable connection between the sub-beam and the corresponding base, the welding connection process, as described above, better ensures the flatness and strength between the four bases, thus meeting the installation requirements of the generator.

[0021] Optionally, a fourth reinforcing rib group is provided on the sub-beam near the welding point between the sub-beam and the base.

[0022] By adding a fourth reinforcing rib group through the above scheme, the local cross-sectional polar moment of inertia at the weld between the sub-beam and the base can be increased, and the concentrated point stress can be dispersed and filtered to a larger range of sub-beams, thus achieving peak shaving and valley filling, significantly reducing the peak stress of the weld and extending the high-frequency fatigue life.

[0023] Optionally, the installation platform further includes a second inclined beam group, which includes a third inclined beam and a fourth inclined beam. The third inclined beam and the fourth inclined beam are located between the two sub-beams. The two ends of the third inclined beam and the fourth inclined beam are detachably connected to the two sub-beams respectively. The third inclined beam and the fourth inclined beam are both parallel to the first direction and are arranged at intervals along the second direction.

[0024] With the above scheme, under the condition of coping with the acceleration load generated by the severe impact of the nacelle along the first direction, the third and fourth inclined beams mainly bear the pure tensile or pure compressive axial forces, thereby giving full play to the load-bearing efficiency of the materials themselves and increasing the structural stiffness of the generator frame in the first direction.

[0025] Optionally, the third and fourth inclined beams are connected to the two sub-beams via tie plates and bolts.

[0026] The above solution eliminates the need to cut or slot the sub-beams or inclined beams, thus preserving the integrity of each beam structure, avoiding stress concentration caused by cutting, ensuring that the connection strength meets the load-bearing requirements of the first direction, and also offering the advantage of easy disassembly and assembly, facilitating subsequent equipment maintenance and component replacement.

[0027] Optionally, the main beam, the secondary beam, and the first inclined beam group are all connected by bolt assemblies with anti-loosening pads.

[0028] The above solution can increase the effective clamping length of bolts by using anti-loosening pads, thereby significantly improving their ability to prevent loosening under long-term high-frequency vibration of equipment.

[0029] According to another aspect of this disclosure, a wind turbine generator set is also provided, the wind turbine generator set including a nacelle, the aforementioned generator frame and generator, the generator being mounted in the nacelle via the generator frame, the first direction being the axial direction of the generator. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 A schematic diagram of a wind turbine generator set according to an embodiment of the present disclosure is shown.

[0032] Figure 2 A schematic diagram showing the connection between a generator frame and a generator according to an embodiment of the present disclosure is shown; Figure 3 A schematic diagram of a generator frame at a first angle according to an embodiment of the present disclosure is shown; Figure 4 A second angle schematic diagram of a generator frame according to an embodiment of the present disclosure is shown; Figure 5 A schematic diagram of the first angle of the main beam according to an embodiment of the present disclosure is shown; Figure 6 A schematic diagram of the second angle of the main beam according to an embodiment of the present disclosure is shown; Figure 7 A schematic diagram of the connection between the secondary beam and the third inclined beam according to an embodiment of the present disclosure is shown; Figure 8 A schematic diagram of the connection between the main beam and the first inclined beam according to an embodiment of the present disclosure is shown; Explanation of reference numerals in the attached figures: 10. Generator frame; 20. Engine room; 30. Generator; 100. Main beam; 110. First stiffener group; 120. Second stiffener group; 130. Third stiffener group; 200. Installation platform; 201. Base; 210. Sub-beam; 211. Fourth reinforcing rib group; 310. First inclined beam; 320. Second inclined beam; 410. Third inclined beam; 420. Fourth inclined beam; 500, pull plate; 600. Anti-loosening pads. Detailed Implementation

[0033] As global wind energy development continues towards grid parity and into deep-sea, low-wind-speed areas, the single-unit capacity of wind turbines has undergone a leapfrog development from hundreds of kilowatts to tens of megawatts. Accompanying this is a dramatic expansion in the diameter of the turbine blade hub and the geometry of the nacelle. The nacelle and generator frame are crucial foundational load-bearing components of a wind turbine; the nacelle is fixed to the tower to support the generator and drive chain. In related technologies, the generator frame inside the nacelle of onshore or offshore wind turbines mostly adopts an integral welded structure. However, this integral welded generator frame has revealed several significant and insurmountable technical defects in practical applications. Firstly, there is a fatal bottleneck in logistics and transportation. Due to the limitations of the width of land transportation channels (usually the standard width of highways or bridges), the dimensions of the integral welded generator frame often exceed the width and limits. This requires companies to apply for special oversized transport permits from transportation management departments and to equip themselves with special escort vehicles and specially constructed roads, leading to a multiplied or even exponential increase in logistics and transportation costs.

[0034] Secondly, there are issues of manufacturing costs and platform compatibility. The welding process for large generator frames is extremely complex, not only requiring long on-site welding time and huge consumption of welding materials, but also necessitating costly post-weld overall annealing to eliminate residual thermal stress. Moreover, once the positions of the sub-beams and main beams are welded and fixed in the factory, the entire frame becomes an unadjustable, rigid body, lacking compatibility with different lengths and sizes of drive trains or generators that may be installed in the future, seriously hindering the platform-based design and modular selection of wind turbines.

[0035] The most serious issue is that during the harsh service life of wind turbines, the units inevitably encounter lightning overloads, localized fatigue cracks caused by long-term alternating loads, or fatal damage to the generator stator and rotor. Faced with a non-removable, integrally welded generator frame, maintenance personnel cannot replace parts of the generator frame or the generator in situ from within the nacelle hundreds of meters above the ground. The only solution is to rent extremely expensive large crawler cranes or truck cranes to remove the massive nacelle roof, and then hoist the generator, weighing tens or even hundreds of tons, along with the generator frame to the ground for repairs. This not only results in lengthy downtime but also incurs extremely high costs for machinery rental and personnel deployment.

[0036] To address this, the present disclosure includes a first and a second inclined beam, with the first and second inclined beams originating from their respective main beams and converging inwards, converging at the middle area of ​​the mounting platform along a second direction to form a "figure-eight" layout. This figure-eight layout creates a triangular stable structure between the two inclined beams. This triangular stable structure effectively absorbs and resists torsional deformation, significantly reducing the internal shear stress generated when the generator frame sways left and right, improving load-bearing capacity, and thus enhancing the structural stability of the mounting platform and the generator after installation, reducing the possibility of damage and lowering the maintenance probability.

[0037] Meanwhile, the main beam, mounting platform, and first inclined beam assembly are connected by detachable connections, facilitating independent processing and transportation of each component. This reduces the difficulty of transporting and manufacturing the generator frame and makes on-site assembly more flexible. Furthermore, even in the event of damage, the damaged component can be replaced individually during subsequent maintenance, eliminating the need for complete replacement and reducing maintenance costs. Additionally, it facilitates the removal of the mounting platform, first inclined beam, and second inclined beam during generator dismantling, creating a disassembly and assembly space between the two main beams. This space allows the generator to be vertically lifted and lowered to the ground.

[0038] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this disclosure, but not all embodiments.

[0039] like Figure 1 and Figure 2 As shown, this disclosure provides a wind turbine generator set, which may include a tower and a nacelle 20 installed at the top of the tower. The tower serves as the main supporting part of the wind turbine generator set and is used to raise the height of the nacelle 20, so that the wind turbine connected to the nacelle 20 can capture more stable and stronger wind energy, thereby improving power generation efficiency. The nacelle 20 may house a generator frame 10 and a generator 30. The generator frame 10 is used to support and fix the generator 30, so that the generator 30 is installed inside the nacelle 20 via the generator frame 10.

[0040] Regarding the specific structure of generator frame 10, such as Figure 3 and Figure 4 As shown, the generator frame 10 includes two main beams 100. The main beams 100 extend along a first direction, which is the same as or approximately the same as the axis of the generator 30. The two main beams 100 are spaced apart along a second direction, which is perpendicular to the first direction. The main beams 100 serve as the main load-bearing components of the entire generator frame 10. Their extension along the axis of the generator 30 facilitates the uniform transfer of the generator 30's weight and operating load to the bottom support point along the length of the main beams 100. Furthermore, the main beams 100 also serve as the foundation for the mounting platform 200 and other components, which are assembled and connected with reference to the main beams 100. In addition, the spaced arrangement of the two main beams 100 along the second direction creates a disassembly and assembly space between them, allowing the generator 30 to be vertically lifted and lowered to the ground during subsequent disassembly.

[0041] The generator frame 10 may also include a mounting platform 200, which is located at one end of the main beam 100 along the first direction. In practical applications, the mounting platform 200 is typically located at the end of the main beam 100 near the rear of the nacelle 20, so that the generator 30 mounted on the mounting platform 200 can be as close as possible to the rear of the nacelle 20, allowing sufficient space at the front of the nacelle 20 for installing other components. The mounting platform 200 is connected to the two main beams 100, and a base 201 for connecting to the generator 30 is provided on the mounting platform 200.

[0042] As Figure 1As shown, during the operation of a wind turbine, the wind rotor is subjected to unbalanced loads caused by wind loads, resulting in periodic swaying of the nacelle 20. This causes the generator frame 10 to be subjected to acceleration and angular acceleration loads in different directions. To address this, the generator frame 10 may further include a first inclined beam assembly, comprising a first inclined beam 310 and a second inclined beam 320. One end of the first inclined beam 310 is connected to one of the main beams 100, and one end of the second inclined beam 320 is connected to the other main beam 100. The other ends of the first and second inclined beams 310 are connected to the mounting platform 200, and the length directions of the first and second inclined beams 320 intersect, or in other words, the inclined beams are angled relative to the main beams 100. This creates a triangular stable structure between the main beams 100, the inclined beams, and the mounting platform 200. This triangular stable structure effectively absorbs and resists torsional deformation, significantly reduces the internal shear stress generated when the generator frame sways left and right, improves load-bearing capacity, and thus enhances the structural stability of the mounting platform and the generator after installation. To put it another way, without the first inclined beam 310 and the second inclined beam 320, the connection node between the main beam 100 and the mounting platform 200 would be prone to relative displacement. However, if the first inclined beam 310 and the second inclined beam 320 are set in parallel, the members will experience parallel lateral slippage in the same direction under lateral force, making it impossible to form a restraining couple, and the torsional resistance will be completely lost.

[0043] Furthermore, one end of the first inclined beam 310 is detachably connected to one of the main beams 100, and one end of the second inclined beam 320 is detachably connected to another main beam 100. The other ends of the first inclined beam 310 and the second inclined beam 320 are detachably connected to the mounting platform 200. This allows for the detachment of the main beams 100, the first inclined beam assembly, and the mounting platform 200, facilitating independent processing and transportation of each component, reducing the difficulty of transporting and manufacturing the generator frame, and making on-site assembly more flexible. In subsequent maintenance, damaged components can be replaced individually without replacing the entire assembly, reducing maintenance costs. Simultaneously, it facilitates the removal of the mounting platform 200, the first inclined beam 310, and the second inclined beam 320 when dismantling the generator 30, creating a disassembly and assembly space between the two main beams 100. This space allows the generator 30 to be vertically lifted downwards and lowered to the ground.

[0044] Regarding the specific scheme for the intersection of the length direction of the first inclined beam 310 and the length direction of the second inclined beam 320, this disclosure provides two feasible embodiments for reference.

[0045] In Example 1, the first inclined beam 310 and the second inclined beam 320 originate from their respective main beams 100 and converge inwards, meeting at the middle region of the mounting platform 200 along the second direction, forming a "figure-eight" layout. This figure-eight layout creates a triangular stable structure between the main beams 100, the inclined beams, and the mounting platform 200. This triangular stable structure can effectively absorb and resist torsional deformation, significantly reducing the internal shear stress generated when the generator frame 10 sways from side to side, improving load-bearing capacity, and thus enhancing the structural stability of the mounting platform 200 and the generator 30 after installation.

[0046] For example, the other end of the first inclined beam 310 and the other end of the second inclined beam 320 are spaced apart along the second direction; or, the other end of the first inclined beam 310 and the other end of the second inclined beam 320 abut against each other.

[0047] In Example 2, the first inclined beam 310 and the second inclined beam 320 intersect, forming a roughly X-shaped structure. Compared to a figure-eight layout, the X-shaped intersection allows the two inclined beams to form a mutually supporting stress node at the middle, evenly distributing the overall lateral torsional load onto the two beams, further optimizing the force transmission path and avoiding structural deformation caused by localized stress concentration. At the intersection, the two inclined beams can be fixed as a whole by welding or bolting. When the generator frame is subjected to a unilateral lateral load, the deformation of the beam on the compression side will directly drive the beam on the tension side through the intersection, forming a reverse restraint, maximizing the limitation of the torsional deformation amplitude of the structure, resulting in higher overall structural stiffness and better stability of the generator frame.

[0048] It should be noted that in this disclosure, "first direction" generally corresponds to the direction of the generator 30 axis, i.e. Figure 1 The X-axis direction shown, the "second direction" corresponds to the transverse direction perpendicular to the first direction, that is... Figure 1 The Y-axis direction is shown, while the vertical direction in space corresponds to... Figure 1 The Z-axis direction is shown.

[0049] For example, multiple optional connection holes can be set at the connection points of the main beam 100, the mounting platform 200 and the first inclined beam group, so that the corresponding holes can be connected according to the different transmission chain lengths of the models, thereby improving compatibility and realizing platform design.

[0050] In some embodiments, such as Figure 3 and Figure 5As shown, a first stiffener group 110 is provided on the main beam 100 near the end away from the installation platform 200. The end of the main beam 100 away from the installation platform 200 has the largest bending moment under the Wy load (an angular acceleration load in the pitch direction about the y-axis). By setting the first stiffener group 110, the local bending stiffness in this area can be increased, avoiding local buckling or excessive stress, reducing the local high stress generated when the generator frame 10 sways up and down under the Wy load, and improving the overall stability and service life of the structure.

[0051] For example, the first stiffener group 110 may include multiple stiffeners arranged along the length of the main beam 100, conforming to the stress distribution characteristics of the main beam 100, and specifically improving the structural strength of key parts without increasing the overall weight too much. At the same time, the first stiffener group 110 is located on the side of the main beam 100 away from the first inclined beam group, avoiding interference with the first inclined beam group.

[0052] In some embodiments, a second stiffener group 120 is provided on the main beam 100 between the first stiffener group 110 and the mounting platform 200. This area typically corresponds to the stress zone of the hoisting point. Under overall hoisting conditions, the enormous tension of the wire ropes will apply extremely high concentrated stress to the main beam 100. The provision of the second stiffener group 120 can effectively enhance the local load-bearing capacity and prevent the main beam 100 from experiencing wavy plastic instability or local yielding during hoisting.

[0053] For example, the second stiffener group 120 may include multiple stiffeners, such as 3, 4, 5, 6, etc. Taking the second stiffener group 120 including 6 stiffeners as an example, the main beam 100 has 3 stiffeners on one side adjacent to the first inclined beam group and 3 stiffeners on the other side.

[0054] Regarding the specific structure of the installation platform 200, in some embodiments, such as Figure 3 and Figure 4 As shown, the mounting platform 200 includes at least two secondary beams 210. The secondary beams 210 extend along a second direction, spanning and overlapping the two main beams 100. Both ends of the secondary beams 210 are detachably connected to the two main beams 100. At least two secondary beams 210 are spaced apart along a first direction. The secondary beams 210 act as lateral support members, connecting the two main beams 100 and providing the necessary lateral stiffness and stability. Simultaneously, the secondary beams 210 are also connected to the aforementioned first inclined beam group and the subsequent second inclined beam group, serving as a hub for force conversion and distribution. When the secondary beams 210 press against the main beams 100, they can significantly increase the vertical ( Figure 1 The flexural stiffness (in the Z direction as shown) resists flexural deformation caused by vertical loads.

[0055] In some embodiments, such as Figure 4 and Figure 6As shown, a third reinforcing rib group 130 is provided on the main beam 100 near the overlap between the main beam 100 and the secondary beam 210. In other words, the third reinforcing rib group 130 is located on the main beam 100, directly below the cross intersection of the main beam 100 and the secondary beam 210. The intersection of the secondary beam 210 and the main beam 100 is a crucial hub for the three-dimensional conversion of force flow. The third reinforcing rib group 130, acting as an internal compressive support column, strengthens the local stiffness of this node, ensuring that the vertical load from the secondary beam 210 can be transferred to the underlying main beam 100 without loss, preventing localized compressive collapse.

[0056] The number of the aforementioned secondary beams 210 can be two, three, four, etc. Taking two secondary beams 210 as an example, the first inclined beam 310 and the second inclined beam 320 converge on the middle area of ​​the secondary beam 210 near the end of the main beam 100. Simultaneously, the first inclined beam 310 and the second inclined beam 320 are also connected to another secondary beam 210. That is, the first inclined beam 310 and the second inclined beam 320 are detachably connected to the two secondary beams 210 respectively. In this way, the two inclined beams and the two secondary beams form a stable triangular support structure, gradually transferring the weight of the generator 30 and the load generated during operation to the main beam 100, and then through the main beam 100 to the connection nodes of the nacelle 20. This ensures that the entire generator frame 10 is subjected to uniform stress, avoids excessive local stress leading to structural fatigue damage, and improves the overall reliability and service life of the structure.

[0057] Correspondingly, four bases 201 are provided, and each sub-beam 210 is connected to two bases 201, so that the sub-beam 210 can be smoothly connected to the generator 30 through the bases 201.

[0058] Furthermore, the sub-beam 210 is welded to the corresponding base 201. Compared to a detachable connection, the welding connection process better ensures the flatness and strength between the four bases 201, meeting the installation requirements of the generator 30.

[0059] In some embodiments, such as Figure 4 As shown, a fourth reinforcing rib group 211 is provided on the sub-beam 210 near the weld between the sub-beam 210 and the base 201. Since the excitation force of the generator 30 is directly transmitted downward through the base 201, the weld between the sub-beam 210 and the base 201 is a high-risk stress concentration area where fatigue microcracks are easily initiated. Adding a fourth reinforcing rib group 211 at this location increases the local polar moment of inertia of the cross section, disperses and filters the concentrated point stress to a wider range of the sub-beam 210, achieving peak shaving and valley filling, significantly reducing the peak stress of the weld, and extending the high-frequency fatigue life.

[0060] For example, the fourth stiffener group 211 may include multiple stiffeners, which are spaced apart along the length of the sub-beam 210 and can cover the length of the corresponding base 201 on the sub-beam 210. With this configuration, the fourth stiffener group 211 can completely cover the stress concentration area corresponding to the welding position between the base 201 and the sub-beam 210, maximizing the effect of stress dispersion, preventing stress leakage from the spaced areas of the stiffeners, further improving the fatigue resistance of the structure, and ensuring the long-term stable operation of the generator frame 10.

[0061] To cope with the acceleration load generated by the severe fore-and-aft impacts of the cabin 20 along the first direction, in some embodiments, such as Figure 3 and Figure 4 As shown, the mounting platform 200 also includes a second inclined beam group, which includes a third inclined beam 410 and a fourth inclined beam 420. The third and fourth inclined beams 410 and 420 are located between two sub-beams 210, and their ends are detachably connected to the two sub-beams 210 respectively. Both the third and fourth inclined beams 410 and 420 are parallel to the first direction and spaced apart along the second direction. Thus, under the condition of coping with the acceleration load generated by the severe impact of the nacelle 20 along the first direction, the third and fourth inclined beams 410 and 420 mainly bear pure tensile or pure compressive axial forces, thereby fully utilizing the material's own load-bearing efficiency and increasing the structural stiffness of the generator frame 10 in the first direction.

[0062] Considering that to achieve a cross-shaped connection between the second inclined beam group and the secondary beam 210 on the same plane, cutting is often required to achieve a staggered overlap. Cutting is not only time-consuming and wasteful of materials, but it also introduces extremely high stress concentration factors, inducing fatigue cracks. Therefore, as... Figure 7 As shown, in some embodiments, the connections between the third inclined beam 410 and the fourth inclined beam 420 and the two sub-beams 210 are all made by tie plates 500 and high-strength bolts. The tie plates 500 are respectively attached to the outer side of the sub-beams 210 and the corresponding inclined beams, and the three are fastened into a whole by high-strength bolts. There is no need to cut or slot the sub-beams 210 or the inclined beams, which not only preserves the integrity of the beam structure itself and avoids the stress concentration problem caused by cutting, but also ensures that the connection strength meets the bearing requirements of the first direction load. At the same time, it also has the advantage of convenient disassembly and assembly, which facilitates subsequent equipment maintenance and component replacement.

[0063] In practical applications, the first inclined beam group, the second inclined beam group, and the sub-beam 210 can have intersection points. At these intersection points, the three parts can be connected and fixed using the same set of tie plates 500 and high-strength bolts. This further simplifies the connection structure, reduces the number of fasteners used, lowers the overall assembly complexity and structural weight, and also allows for more direct and smooth force transmission at the intersection points, further ensuring the structural stability of the generator frame under different impact loads.

[0064] In addition, such as Figure 3 and Figure 8 As shown, the main beam 100, the secondary beam 210 and the first inclined beam group can all be fastened together by bolt assemblies with added anti-loosening pads 600. This allows the anti-loosening pads 600 to increase the effective clamping length of the bolts, thereby significantly improving their anti-loosening ability under long-term high-frequency vibration of the equipment.

[0065] Based on the modular and detachable design of the generator frame 10, this disclosure also proposes a generator replacement method based on the generator frame 10, which can change the expensive method of traditional operation and maintenance that requires opening the top cover of the nacelle and using an ultra-large crawler crane.

[0066] The replacement method specifically includes the following steps: When a major overhaul or replacement of generator 30 is required, the operator enters the engine compartment to work. First, the installation platform 200 and the first inclined beam assembly (including unscrewing the fasteners connecting the secondary beam 210, the first inclined beam 310, the second inclined beam 320, the third inclined beam 410, the fourth inclined beam 420, and the main beam 100) are dismantled, and these obstruction components are removed in sequence. During the dismantling process, the generator 30 is temporarily fixed and supported by other components.

[0067] After the aforementioned obstruction components are removed, the structural space directly below the generator 30 is fully opened, exposing two main beams 100 arranged in parallel along the first direction.

[0068] Next, a maintenance gantry with sufficient lifting capacity is installed across these two main beams 100. At this point, the main beams 100 not only serve as the load-bearing frame, but also directly function as the support rails for the movement of the maintenance gantry and the load-bearing foundation. Subsequently, the cover plate passage at the bottom of the cabin cover 20 was removed or opened to completely clear the path to the ground; Finally, by repairing the pulley block and electric hoist mounted on the gantry, the generator 30 was lifted and slowly hoisted vertically from inside the engine compartment through the aforementioned open structural space and cover passage, and then smoothly placed onto the transport truck on the ground.

[0069] The entire generator replacement method transforms the external heavy asset hoisting operation into an internal light asset process, saving high costs for large crane rental and site leveling. The overall construction scale is extremely small, the required personnel and equipment are greatly reduced, the downtime is significantly shortened, and costs are reduced while efficiency is increased.

[0070] The terms "upper" and "lower" used in this disclosure are used to describe the relative positional relationship of the various structures in the accompanying drawings. They are only for the purpose of clarity of description and are not intended to limit the scope of implementation of this disclosure. Changes or adjustments to the relative relationships without substantially altering the technical content should also be considered as part of the scope of implementation of this disclosure.

[0071] It should be noted that, in this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0072] Furthermore, in this disclosure, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0073] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure, and are not intended to limit them. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this disclosure.

Claims

1. A generator frame, characterized in that, The generator frame (10) includes: Two main beams (100) extend along a first direction and are spaced apart along a second direction, wherein the first direction and the second direction are perpendicular. The mounting platform (200) is located at one end of the main beam (100) along the first direction. The mounting platform (200) is connected to the two main beams (100). The mounting platform (200) is provided with a base (201) for connecting to the generator (30). The first inclined beam group includes a first inclined beam (310) and a second inclined beam (320). One end of the first inclined beam (310) is connected to one of the main beams (100), and one end of the second inclined beam (320) is connected to the other main beam (100). The other ends of the first inclined beam (310) and the second inclined beam (320) are connected to the mounting platform (200), and the length direction of the first inclined beam (310) intersects the length direction of the second inclined beam (320).

2. The generator frame according to claim 1, characterized in that, The installation platform (200) is detachably connected to the two main beams (100); One end of the first inclined beam (310) is detachably connected to one of the main beams (100), one end of the second inclined beam (320) is detachably connected to the other main beam (100), and the other ends of the first inclined beam (310) and the second inclined beam (320) are detachably connected to the mounting platform (200).

3. The generator frame according to claim 2, characterized in that, The first inclined beam (310) and the second inclined beam (320) originate from the corresponding main beam (100) and converge inward, converging in the middle area of ​​the installation platform (200) along the second direction.

4. The generator frame according to claim 3, characterized in that, The other end of the first inclined beam (310) and the other end of the second inclined beam (320) are spaced apart along the second direction; or, The other end of the first inclined beam (310) and the other end of the second inclined beam (320) abut against each other.

5. The generator frame according to claim 2, characterized in that, The first inclined beam (310) and the second inclined beam (320) intersect.

6. The generator frame according to any one of claims 1 to 5, characterized in that, The main beam (100) is provided with a first reinforcing rib group (110) near one end away from the mounting platform (200); and / or, A second reinforcing rib group (120) is provided on the main beam (100) between the first reinforcing rib group (110) and the installation platform (200).

7. The generator frame according to any one of claims 1 to 5, characterized in that, The installation platform (200) includes at least two sub-beams (210); The sub-beam (210) extends along the second direction, and both ends of the sub-beam (210) are detachably connected to the two main beams (100). At least two sub-beams (210) are arranged at intervals along the first direction.

8. The generator frame according to claim 7, characterized in that, A third reinforcing rib group (130) is provided on the main beam (100) near the overlap between the main beam (100) and the secondary beam (210).

9. The generator frame according to claim 7, characterized in that, There are two sub-beams (210) and four bases (201), and each sub-beam (210) is welded to two bases (201); The first inclined beam (310) and the second inclined beam (320) are detachably connected to the two sub-beams (210) respectively.

10. The generator frame according to claim 9, characterized in that, A fourth reinforcing rib group (211) is provided on the sub-beam (210) near the welding point between the sub-beam (210) and the base (201).

11. The generator frame according to claim 9, characterized in that, The installation platform (200) further includes a second inclined beam group, which includes a third inclined beam (410) and a fourth inclined beam (420), wherein, The third inclined beam (410) and the fourth inclined beam (420) are located between the two sub-beams (210). The two ends of the third inclined beam (410) and the fourth inclined beam (420) are detachably connected to the two sub-beams (210) respectively. The third inclined beam (410) and the fourth inclined beam (420) are both parallel to the first direction and are arranged at intervals along the second direction.

12. The generator frame according to claim 9, characterized in that, The third inclined beam (410) and the fourth inclined beam (420) are connected to the two sub-beams (210) by tie plates (500) and bolts.

13. The generator frame according to claim 9, characterized in that, The main beam (100), the secondary beam (210), and the first inclined beam group are all connected by bolt assemblies with anti-loosening pads.

14. A wind turbine generator set, characterized in that, The wind turbine generator set includes a nacelle (20), a generator frame (10) as described in any one of claims 1 to 13, and a generator (30). The generator (30) is installed in the nacelle (20) via the generator frame (10), and the first direction is the axial direction of the generator (30).

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