Shafting structure for wind generating set and wind generating set

Abstract

The invention provides a shaft system structure for a wind generating set and the wind generating set. The shafting structure for the wind generating set comprises an inner shaft, an outer shaft arranged on the outer side of the inner shaft, a first bearing and a second bearing, the first bearing and the second bearing are installed at the first end and the second end of the shafting structure respectively and arranged between the inner shaft and the outer shaft, and the first bearing and the second bearing are arranged in the axial direction of the inner shaft. The outer shaft comprises a first bearing supporting section located at the first end and used for supporting the first bearing, a second bearing supporting section located at the second end and used for supporting the second bearing, and a first connecting section located between the first bearing supporting section and the second bearing supporting section. Each of the outer wall face and the inner wall face of the first connecting section is not provided with an inclined arch but only provided with a circular arch. According to the shafting structure for the wind generating set, the rigidity can be improved.

Description

[0001] This application is a divisional application of the invention patent application "Shaft system structure for wind turbine and wind turbine" with application date of January 24, 2022 and application number 202210078863.5. Technical Field

[0002] The present invention relates to the technical field of wind turbines, and more particularly to a shaft system structure for a wind turbine generator set and a wind turbine generator set comprising the shaft system structure. Background Art

[0003] Wind turbines convert wind energy into kinetic energy through the rotation of their impellers, which is then transferred to the generator, which in turn converts the kinetic energy into electrical energy. In wind turbines, the shafting structure, in addition to transmitting torque, also bears a variety of complex alternating loads, such as radial loads, axial loads, and bending moments. The structure and stresses involved are complex, and the various factors that affect wind turbine operation make it prone to various faults. Therefore, the safety of the shafting structure plays a vital role in the normal operation of wind turbines.

[0004] Furthermore, as wind turbine power increases, the loads on the shafting structure increase dramatically, and the corresponding shafting structure size also increases dramatically. Meanwhile, with increasing market competition, the unit cost of wind turbines is being reduced while the reliability requirements are becoming increasingly higher. This has led to a sharp increase in the manufacturing cost of existing shafting structures, and the process is becoming more difficult to implement.

[0005] Therefore, the shaft system structure of wind turbines faces the dual challenges of performance and manufacturing cost. Summary of the Invention

[0006] An object of the present invention is to provide a shafting structure for a wind turbine generator set and a wind turbine generator set with improved rigidity.

[0007] According to one aspect of the present invention, a shafting structure for a wind turbine generator system is provided, the shafting structure comprising an inner shaft, an outer shaft disposed outside the inner shaft, and a first bearing and a second bearing, the first bearing and the second bearing being mounted at a first end and a second end of the shafting structure, respectively, and disposed between the inner shaft and the outer shaft. In the axial direction of the inner shaft, the outer shaft comprises a first bearing support section located at the first end for supporting the first bearing, a second bearing support section located at the second end for supporting the second bearing, and a first connecting section located between the first and second bearing support sections, wherein at least a portion of an outer wall surface of an axial cross-section of the first connecting section is circularly arched.

[0008] Optionally, in the direction from the first bearing support section to the second bearing support section, the outer wall surface of the first connecting section includes a first outer section, a second outer section and a third outer section connected in sequence, the first outer section and the third outer section are circular arches, and the second outer section is an oblique arch.

[0009] Optionally, the first outer section has a curvature radius of 700 mm to 900 mm, the third outer section has a curvature radius of 100 mm to 300 mm, the first connecting section has a total axial length of L1, the first outer section has a length of 0.25 L1 to 0.35 L1, and the third outer section has a length of 0.05 L1 to 0.15 L1.

[0010] Optionally, the second outer section is an oblique arch with a first slope, and the first slope is 2°-4° relative to the inner circumference of the second bearing support section.

[0011] Optionally, at least a portion of an inner wall surface of an axial cross section of the first connecting segment is in an arch shape.

[0012] Optionally, in the direction from the first bearing support section to the second bearing support section, the inner wall surface of the first connecting section includes a first inner section, a second inner section and a third inner section arranged in sequence, the first inner section and the third inner section are circular arches, and the second inner section is an oblique arch.

[0013] Optionally, the first inner section and the third inner section are in the shape of circular arches with a curvature radius between 100 mm and 10,000 mm.

[0014] Optionally, the curvature radius of the first inner section and the third inner section is 100mm-2000mm. When the axial length of the first connecting section is L1, the axial length of the first inner section is 0.10L1-0.20L1, and the axial length of the third inner section is 0.15L1-0.25L1.

[0015] Optionally, the curvature radius of the first inner section and the third inner section is 250 mm-350 mm, and the second inner section is an oblique arch with a second slope, and the second slope is 2°-4° relative to the inner circumference of the second bearing support section.

[0016] Optionally, the inner wall surface of the first connecting section also includes a fourth inner section, which is arranged between the first inner section and the second inner section. The fourth inner section is a circular arch with a curvature radius of 500mm-600mm. When the axial length of the first connecting section is L1, the length of the fourth inner section is 0.10L1-0.20L1.

[0017] Optionally, the inner wall surface of the first connecting section also includes a fifth inner section, which connects the outer end surface of the third inner section and the shoulder of the second bearing support section to each other, and the fifth inner section is an inclined arch with a third slope, and the third slope is 60°-80° relative to the inner circumferential surface of the second bearing support section.

[0018] Optionally, the second bearing support section protrudes outward relative to the end surface of the second end of the outer shaft, and the outer peripheral surface of the second bearing support section and the end surface of the second end of the outer shaft are transitioned through an oblique arch with a fourth slope, and the fourth slope is 10°-13° relative to the outer peripheral surface of the second bearing support section.

[0019] Optionally, the inner shaft includes a third bearing support segment located at the first end, a fourth bearing support segment located at the second end, and a second connecting segment located between the third bearing support segment and the fourth bearing support segment, and the axial cross-section of the second connecting segment is at least partially arched.

[0020] Optionally, the inner wall surface and the outer wall surface of the second connecting section are both arch-shaped, and the curvature radius of the inner wall surface of the second connecting section is greater than the curvature radius of the outer wall surface of the second connecting section.

[0021] Optionally, the curvature radius of the inner wall surface of the second connecting section is 500 mm-6000 mm, and the curvature radius of the outer wall surface of the second connecting section is 500 mm-5000 mm.

[0022] Optionally, the curvature radius of the inner wall surface of the second connecting section is 3000 mm-5000 mm, and the curvature radius of the outer wall surface of the second connecting section is 2000 mm-4000 mm.

[0023] Optionally, both the outer wall surface and the inner wall surface of the first connecting section are arch-shaped.

[0024] Optionally, the outer wall surface of the first connecting section is in the shape of a circular arch with a curvature radius of 500mm-5000mm, and the inner wall surface of the first connecting section is in the shape of a circular arch with a curvature radius of 500mm-5000mm.

[0025] Optionally, the outer wall surface of the first connecting section is in the shape of a circular arch with a curvature radius of 2000mm-4000mm, and the inner wall surface of the first connecting section is in the shape of a circular arch with a curvature radius of 3000mm-5000mm.

[0026] Optionally, the inner shaft includes a third bearing support segment located at the first end, a fourth bearing support segment located at the second end, and a second connecting segment located between the third bearing support segment and the fourth bearing support segment, and the inner wall surface and the outer wall surface of the second connecting segment are both arched.

[0027] Optionally, the outer wall of the second connecting section has a curvature radius of 500 mm to 5000 mm. In the direction from the third bearing support section to the fourth bearing support section, the inner wall of the second connecting section includes a first circular arch section and a second circular arch section connected in sequence, the first circular arch section having a curvature radius of 500 mm to 2000 mm, and the second circular arch section having a curvature radius of 500 mm to 5000 mm.

[0028] Optionally, the curvature radius of the first circular arch segment is 1000mm-2000mm, and the curvature radius of the second circular arch segment is 3000mm-5000mm.

[0029] According to another aspect of the present invention, a wind turbine generator set is provided, comprising the shaft system structure for a wind turbine generator set as described above, wherein the inner shaft is connected to one of the impeller and the nacelle of the wind turbine generator set, and the outer shaft is connected to the other of the impeller and the nacelle.

[0030] The shaft system structure according to the embodiment of the present invention can improve the rigidity of the shaft system structure, reduce the deformation of the shaft system structure, improve the operating conditions inside the bearing, and reduce the change in the air gap of the motor.

[0031] In addition, the shaft system structure according to the embodiment of the present invention can also reduce the material of the shaft system structure and thus reduce the cost of the shaft system structure and the wind turbine generator set. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above and other objects and features of the present invention will become more apparent from the following description in conjunction with the accompanying drawings, in which:

[0033] Figure 1 is a schematic diagram of a shaft system structure for a wind turbine generator set according to an embodiment of the present invention;

[0034] Figure 2 It is along Figure 1 A cross-sectional view taken along line A1-A2;

[0035] Figure 3 yes Figure 2 Magnified view of the P region;

[0036] Figure 4 is a cross-sectional view of a shafting structure for a wind turbine generator set according to the prior art;

[0037] Figure 5 is a cross-sectional view of a shaft system structure for a wind turbine generator set according to another embodiment of the present invention;

[0038] Figure 6 and Figure 7It is a cross-sectional view of a shaft system structure for a wind turbine generator set according to the prior art.

[0039] In the accompanying drawings: 1 is the inner shaft, 2 is the outer shaft, 3 and 4 are bearings, 100 is the inner shaft, 200 is the outer shaft, 300 is the first bearing, 400 is the second bearing, 210 is the first bearing support section, 220 is the second bearing support section, 230 is the first connecting section, 211 and 221 are shaft shoulders, 231a is the first outer section, 232a is the second outer section, 233a is the third outer section, 231b is the first inner section, 232b is the second inner section, 233b is the third inner section, 234b is the fourth inner section, 235b is the fifth inner section, 110 is the third bearing support section, 120 is the fourth bearing support section, 130 is the second connecting section, 131 is the first arch section, and 132 is the second arch section. DETAILED DESCRIPTION

[0040] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0041] Figure 1 is a schematic diagram of a shaft system structure for a wind turbine generator set according to an embodiment of the present invention, Figure 2 It is along Figure 1 A cross-sectional view taken along line A1-A2, Figure 3 yes Figure 2 Magnified view of the P region.

[0042] like Figure 2 As shown, the shafting structure for a wind turbine generator according to an embodiment of the present invention includes an inner shaft 100, an outer shaft 200 disposed outside the inner shaft 100, and a first bearing 300 and a second bearing 400. The first bearing 300 and the second bearing 400 are mounted at the first end and the second end of the shafting structure, respectively, and are disposed between the inner shaft 100 and the outer shaft 200.

[0043] According to an embodiment of the present invention, Figure 2 As shown, in the axial direction of the inner shaft 100, the outer shaft 200 may include a first bearing support section 210, a second bearing support section 220 and a first connecting section 230. The first bearing support section 210 is located at the first end and supports the first bearing 300, the second bearing support section 220 is located at the second end and supports the second bearing 400, and the first connecting section 230 is located between the first bearing support section 210 and the second bearing support section 220. At least part of the outer wall surface of the axial cross section of the first connecting section 230 is in the shape of a circular arch. The shafting structure according to the embodiment of the present invention may have improved rigidity. Hereinafter, reference will be made to Figure 2 The specific shape of the first connecting section 230 is described in detail.

[0044] According to an embodiment of the present invention, Figure 2As shown, at least a portion of the outer wall of the first connecting section 230 may be circularly arched. In the direction from the first bearing support section 210 to the second bearing support section 220, the outer wall of the first connecting section 230 includes a first outer section 231a, a second outer section 232a, and a third outer section 233a, which are sequentially connected. The first outer section 231a and the third outer section 233a are circularly arched, while the second outer section 232a is obliquely arched.

[0045] According to an embodiment of the present invention, the radius of curvature of the first outer section 231a is 700 mm to 900 mm, and the radius of curvature of the third outer section 233a is 100 mm to 300 mm. When the radius of curvature of the first outer section 231a is less than 700 mm and the radius of curvature of the third outer section 233a is less than 100 mm, the resulting arch is too small, resulting in insignificant improvement in stiffness. When the radius of curvature of the first outer section 231a is greater than 900 mm and the radius of curvature of the third outer section 233a is greater than 300 mm, the resulting arch is too large, potentially resulting in reduced stiffness.

[0046] In a specific embodiment, the radius of curvature of the first outer section 231 a is 805 mm, and the radius of curvature of the third outer section 233 a is 200 mm.

[0047] like Figure 3 As shown, the second outer section 232a is an oblique arch with a first slope α1, which is 2°-4° (e.g., 3°) relative to the inner circumference of the second bearing support section 220. When the first slope α1 is less than 2°, the slope is too small and the stiffness improvement effect is not significant. When the first slope α1 is greater than 4°, the slope is too large, resulting in an excessively large space occupied by the shafting structure.

[0048] According to an embodiment of the present invention, when the total length of the first connecting segment 230 is L1, the length of the first outer segment 231a is 0.25L1-0.35L1, and the length of the third outer segment 233a is 0.05L1-0.15L1. If the length of the first outer segment 231a is less than 0.25L1 or the length of the third outer segment 233a is less than 0.05L1, the length of the first outer segment 231a or the third outer segment 233a may be too short, resulting in an insufficient length of the arc shape. If the length of the first outer segment 231a is greater than 0.35L1 or the length of the third outer segment 233a is greater than 0.15L1, the length of the first outer segment 231a or the third outer segment 233a may be too long, making it difficult to form a smooth outer wall surface of the first connecting segment 230. The total length L1 of the first connecting segment 230 can be the distance between the shoulder 211 and the shoulder 221 in the axial direction.

[0049] According to an embodiment of the present invention, at least a portion of the inner wall surface of the axial cross section of the first connecting segment 230 is in an arch shape.

[0050] like Figure 2 As shown, in the direction from the first bearing support section 210 to the second bearing support section 220 , the inner wall surface of the first connecting section 230 may include a first inner section 231 b , a second inner section 232 b and a third inner section 233 b that are sequentially arranged.

[0051] According to an embodiment of the present invention, to improve the rigidity of the shafting structure, the first inner section 231b and the third inner section 233b may be circular arches with a curvature radius between 100 mm and 10,000 mm, and the second inner section 232b may be an oblique arch. When the curvature radius of the first inner section 231b and the third inner section 233b is less than 100 mm, the resulting arch is too small, resulting in insignificant rigidity improvement. When the curvature radius of the first inner section 231b and the third inner section 233b is greater than 10,000 mm, the resulting arch is too large, potentially resulting in reduced rigidity.

[0052] According to an embodiment of the present invention, Figure 2 As shown, the curvature radius of the first inner section 231b and the third inner section 233b are 100mm-2000mm, preferably 250mm-350mm, respectively. In a specific embodiment, the curvature radius of the first inner section 231b and the third inner section 233b can be 300mm, respectively.

[0053] According to an embodiment of the present invention, when the total length of the first connecting section 230 is L1, the lengths of the first inner section 231b and the third inner section 233b may be 0.15L1-0.20L1, respectively. If the lengths of the first inner section 231b and the third inner section 233b are less than 0.15L1, they may be too short, resulting in an insufficient length of the arc shape. If the lengths of the first inner section 231b and the third inner section 233b are greater than 0.20L1, they may be too long, making it difficult to form a smooth inner wall surface of the first connecting section 230.

[0054] like Figure 3 As shown, the second inner section 232b is an oblique arch with a second slope α2. The second slope α2 can be 2°-4° (for example, 3°) relative to the inner circumference of the second bearing support section 220. When the second slope α2 is less than 2°, the slope is too small and the effect of improving the rigidity is not significant. When the second slope α2 is greater than 4°, the slope is too large, resulting in an excessively large space occupied by the shafting structure.

[0055] According to an embodiment of the present invention, Figure 2As shown, the inner wall surface of the first connecting section 230 may further include a fourth inner section 234b, which may be disposed between the first inner section 231b and the second inner section 232b. To smoothly connect the first inner section 231b and the second inner section 232b, the fourth inner section 234b is an arched shape with a curvature radius of 500 mm to 600 mm. According to an embodiment of the present invention, when the total length of the first connecting section 230 is L1, the length of the fourth inner section (234b) is 0.10L1 to 0.20L1.

[0056] According to an embodiment of the present invention, Figure 2 As shown, the inner wall surface of the first connecting section 230 may further include a fifth inner section 235b, which may connect the outer end surfaces of the third inner section 233b and the shaft shoulder 221 of the second bearing support section 220. Figure 3 As shown, the fifth inner section 235b is an inclined arch with a third slope α3. In order to smoothly connect the third inner section 233b with the outer end surface of the shoulder 221 of the second bearing support section 220, the third slope α3 can be 60°-80° relative to the inner circumferential surface of the second bearing support section 220.

[0057] When the outer wall surface and the inner wall surface of the first connection section 230 are formed as described above, the thickness of the first connection section 230 can be made substantially uniform.

[0058] According to an embodiment of the present invention, the second bearing support section 220 may protrude outward relative to the end surface of the second end of the outer shaft 200. In order to further improve the rigidity of the shafting structure, as shown in FIG. Figure 3 As shown, the outer circumferential surface of the second bearing support section 220 and the end surface of the second end of the outer shaft 200 are transitioned through an oblique arch with a fourth slope α4. Relative to the outer circumferential surface of the second bearing support section 220, the fourth slope α4 can be 10°-13° (for example, 12°).

[0059] In addition, the oblique arch shape with the fourth slope α4 can transition to the outer circumferential surface of the second bearing support segment 220 and the end surface of the second end of the outer shaft 200 in an arc shape.

[0060] According to an embodiment of the present invention, the inner shaft 100 may include a third bearing support segment 110, a fourth bearing support segment 120, and a second connecting segment 130. The third bearing support segment 110 is located at the first end, the fourth bearing support segment 120 is located at the second end, and the second connecting segment 130 is located between the third bearing support segment 110 and the fourth bearing support segment 120.

[0061] According to an embodiment of the present invention, an axial cross-section of the second connecting segment 130 is at least partially arched.

[0062] As an example, both the inner wall surface and the outer wall surface of the second connecting section 130 may be arch-shaped.

[0063] As an example, the curvature radius of the inner wall surface of the second connecting segment 130 may be greater than the curvature radius of the outer wall surface of the second connecting segment 130 .

[0064] As an example, the radius of curvature of the inner wall of the second connecting segment 130 can be 500-6000 mm (e.g., 5600 mm), and the radius of curvature of the outer wall of the second connecting segment 130 can be 500 mm-5000 mm (e.g., 3320 mm). By setting the radius of curvature of the inner and outer walls of the second connecting segment 130 as described above, a second connecting segment 130 with a relatively uniform thickness can be formed.

[0065] When the radius of curvature of the inner and outer walls of the second connecting section 130 is less than 500 mm, the resulting arch is too small, resulting in insignificant improvement in stiffness. When the radius of curvature of the inner wall of the second connecting section 130 is greater than 6000 mm, and the radius of curvature of the outer wall of the second connecting section 130 is greater than 5000 mm, the resulting arch is too large, potentially resulting in reduced stiffness.

[0066] Preferably, the curvature radius of the inner wall surface of the second connecting section 130 is 3000 mm-5000 mm, and the curvature radius of the outer wall surface of the second connecting section 130 is 2000 mm-4000 mm.

[0067] According to the shaft system structure of the embodiment of the present invention, the material of the shaft system structure can be reduced, thereby reducing the cost of the shaft system structure and the wind turbine generator set. At the same time, the stiffness of the shaft system structure can be improved, the deformation of the shaft system structure can be reduced, the operating condition inside the bearing can be improved, and the change in the motor air gap can be reduced.

[0068] According to the embodiments of the present invention, the specific types of the first bearing 300 and the second bearing 400 are not particularly limited. For example, the first bearing 300 and the second bearing 400 may be sliding bearings or rolling bearings. As an example, each of the first bearing 300 and the second bearing 400 may be a double row tapered roller bearing (DRTRB), a cylindrical roller bearing (CRB), a spherical roller bearing (SRB), or a tapered roller bearing (TRB).

[0069] Furthermore, according to embodiments of the present invention, one of the inner shaft 100 and the outer shaft 200 can be a fixed shaft, and the other can be a movable shaft. For example, the inner shaft 100 can be a fixed shaft, and the outer shaft 200 can be a movable shaft. Alternatively, the inner shaft 100 can be a movable shaft, and the outer shaft 200 can be a fixed shaft. The inner shaft 100 and the outer shaft 200 can have different shapes, such as different lengths or different cross-sections, and the lengths and cross-sections are not particularly limited.

[0070] Figure 4This is a cross-sectional view of the shaft structure of a wind turbine generator set according to the prior art. Figure 4 As shown, the inner shaft 1 includes a shaft disposed between a bearing 3 and a bearing 4 and Figure 2 The outer shaft 2 includes a connecting section corresponding to the second connecting section 130, which is provided between the bearing 3 and the bearing 4 and Figure 2 The connecting segment corresponding to the first connecting segment 230 in FIG. Figure 2 Compared with the shafting structure according to the embodiment of the present invention shown in FIG. Figure 4 The shape of the inner wall and outer wall of the connecting section of the inner shaft 1 is similar to Figure 2 The shapes of the inner wall and outer wall of the second connecting section 130 are different, that is, no circular arch is formed, and the shapes of the inner wall and outer wall of the connecting section of the outer shaft 2 are different from those of the second connecting section 130. Figure 2 The shapes of the inner wall and outer wall of the second connecting section 130 are different, that is, the inner wall of the connecting section of the outer shaft 2 does not form a first inner section and a third inner section in the shape of a circular arch and a second inner section in the shape of an oblique arch, and the outer wall of the connecting section of the outer shaft 2 does not form a first outer section and a third outer section in the shape of a circular arch and a second outer section in the shape of an oblique arch.

[0071] It should be understood that Figure 4 The inner wall surface of the connecting section of the outer shaft 2 has only small chamfers at both ends, which is different from the arched first and third inner sections according to the present invention.

[0072] In order to compare the prior art Figure 2 The shafting structure and the embodiment of the present invention Figure 4 The stiffness of the shafting structure is the same under the condition of the same load and the same weight of the shafting structure. Figure 2 and Figure 4 The deformation of the shafting structure is simulated and calculated. The results show that Figure 2 The Z-axis deformation of the shaft structure is 0.228 mm. Figure 4 The Z-axis deformation of the shaft system structure is 0.342 mm. That is, the shaft system structure according to the embodiment of the present invention has a small deformation and high rigidity.

[0073] Figure 5 FIG is a cross-sectional view of a shaft structure for a wind turbine generator set according to another embodiment of the present invention. Figure 5 The shafting structure for a wind turbine generator set according to another embodiment of the present invention is described. However, in order to avoid redundancy, only the shafting structure according to the embodiment of the present invention will be described. Figure 2 Different parts of the shafting structure.

[0074] and Figure 2 The shape of the first connecting section 230 is different. Figure 5In the shaft structure shown, the outer wall and inner wall of the first connecting section 230 are both in the shape of a circular arch. Figure 5 In the shafting structure shown, the inner wall surface and the outer wall surface of the first connecting section 230 do not have an oblique arch shape, but only have a circular arch shape.

[0075] According to an embodiment of the present invention, the outer wall surface of the first connecting section 230 is in the shape of a circular arch with a curvature radius of 500mm-5000mm, and the inner wall surface of the first connecting section 230 is in the shape of a circular arch with a curvature radius of 500mm-5000mm.

[0076] Preferably, the outer wall surface of the first connecting section 230 is in the shape of a circular arch with a curvature radius of 2000 mm-4000 mm, and the inner wall surface of the first connecting section 230 is in the shape of a circular arch with a curvature radius of 3000 mm-5000 mm.

[0077] In addition, Figure 5 In the shafting structure shown, both the outer wall and the inner wall of the second connecting section 130 are in the shape of a circular arch, and the curvature radius of the outer wall of the second connecting section 130 is 500 mm to 5000 mm.

[0078] The inner wall surface of the second connecting section 130 includes a first circular arch section 131 and a second circular arch section 132 connected in sequence. The curvature radius of the first circular arch section 131 is 500 mm-2000 mm, and the curvature radius of the second circular arch section 132 is 500 mm-5000 mm.

[0079] Preferably, the curvature radius of the first circular arch segment 131 is 1000 mm-2000 mm, and the curvature radius of the second circular arch segment 132 is 3000 mm-5000 mm.

[0080] According to an embodiment of the present invention, the transitions between the inner and outer walls of the first connecting section 230 and the inner and outer walls of the second connecting section 130 and the adjacent structures are rounded transitions, and the rounded radius may be 20 mm to 200 mm.

[0081] Figure 6 and Figure 7 This is a cross-sectional view of the shaft structure for a wind turbine generator set according to the prior art. Figure 6 and Figure 7 In the embodiment, the inner shaft 1 includes a shaft disposed between the bearing 3 and the bearing 4 and Figure 2 The outer shaft 2 includes a connecting section corresponding to the second connecting section 130, which is provided between the bearing 3 and the bearing 4 and Figure 2 The first connecting segment 230 in the corresponding connecting segment. Figure 6 In the embodiment, the inner wall and outer wall of the connecting section of the outer shaft 2 and the inner wall and outer wall of the connecting section of the inner shaft 1 are both formed into an arch by straight line segments. Figure 7In the embodiment, the inner wall surface and the outer wall surface of the connecting section of the outer shaft 2 and the inner wall surface and the outer wall surface of the connecting section of the inner shaft 1 all form an inclined plane.

[0082] In order to compare the prior art Figure 6 and Figure 7 The shafting structure and the embodiment of the present invention Figure 5 The stiffness of the shafting structure is the same under the condition of the same load and the same weight of the shafting structure. Figures 5 to 7 The deformation of the shafting structure is simulated and calculated. The results show that Figure 5 The total deformation of the shafting structure is 1.037 mm. Figure 6 The total deformation of the shaft structure is 1.39mm. Figure 7 The total deformation of the shaft structure in the embodiment of the present invention is 2.035 mm. Figure 5 The shafting structure has small deformation and high rigidity.

[0083] Another embodiment of the present invention may provide a wind turbine generator set. The wind turbine generator set according to the embodiment of the present invention includes the shaft system structure as described above, that is, Figure 2 The shafting structure shown or Figure 5 The shaft system structure shown in FIG. 1 is a diagram showing a shaft system structure in which the inner shaft 100 can be connected to one of the impeller and the nacelle of the wind turbine generator set, and the outer shaft 200 can be connected to the other of the impeller and the nacelle.

[0084] As described above, the shaft system structure according to the embodiment of the present invention can improve the rigidity of the shaft system structure, reduce the deformation of the shaft system structure, improve the operating conditions inside the bearing, and reduce the change of the motor air gap.

[0085] In addition, the shaft system structure according to the embodiment of the present invention can also reduce the material of the shaft system structure and thus reduce the cost of the shaft system structure and the wind turbine generator set.

[0086] While exemplary embodiments of the present invention have been described in detail with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the claims.

Claims

1. A shaft system structure for a wind turbine generator set, the shaft system structure comprising an inner shaft (100), an outer shaft (200) arranged outside the inner shaft (100), and a first bearing (300) and a second bearing (400), wherein the first bearing (300) and the second bearing (400) are respectively mounted at a first end and a second end of the shaft system structure and are arranged between the inner shaft (100) and the outer shaft (200). It is characterized by: In the axial direction of the inner shaft (100), the outer shaft (200) includes a first bearing support section (210) located at the first end for supporting the first bearing (300), a second bearing support section (220) located at the second end for supporting the second bearing (400), and a first connecting section (230) located between the first bearing support section (210) and the second bearing support section (220). Wherein, each of the outer wall surface and the inner wall surface of the first connecting section (230) does not have an oblique arch shape, but only has a circular arch shape.

2. The shaft system structure for a wind turbine generator set according to claim 1, characterized in that: The outer wall surface of the first connecting section (230) is in the shape of a circular arch with a curvature radius of 500mm-5000mm, and the inner wall surface of the first connecting section (230) is in the shape of a circular arch with a curvature radius of 500mm-5000mm.

3. The shaft system structure for a wind turbine generator set according to claim 1, characterized in that: The outer wall surface of the first connecting section (230) is in the shape of a circular arch with a curvature radius of 2000mm-4000mm, and the inner wall surface of the first connecting section (230) is in the shape of a circular arch with a curvature radius of 3000mm-5000mm.

4. The shaft system structure for a wind turbine generator set according to claim 1, characterized in that: The inner shaft (100) comprises a third bearing support section (110) located at the first end, a fourth bearing support section (120) located at the second end, and a second connecting section (130) located between the third bearing support section (110) and the fourth bearing support section (120), wherein the inner wall surface and the outer wall surface of the second connecting section (130) are both in the shape of a circular arch.

5. The shaft system structure for a wind turbine generator set according to claim 4, characterized in that: The curvature radius of the outer wall of the second connecting section (130) is 500 mm to 5000 mm. In the direction from the third bearing support section (110) to the fourth bearing support section (120), the inner wall surface of the second connecting section (130) includes a first circular arch section (131) and a second circular arch section (132) connected in sequence, the curvature radius of the first circular arch section (131) is 500mm-2000mm, and the curvature radius of the second circular arch section (132) is 500mm-5000mm.

6. The shaft system structure for a wind turbine generator set according to claim 5, characterized in that: The curvature radius of the first circular arch section (131) is 1000mm-2000mm, and the curvature radius of the second circular arch section (132) is 3000mm-5000mm.

7. The shaft system structure for a wind turbine generator set according to claim 4, characterized in that: The transition between the inner wall surface and the outer wall surface of the first connecting section (230) and the inner wall surface and the outer wall surface of the second connecting section (130) and the adjacent structure is a rounded transition.

8. The shaft system structure for a wind turbine generator set according to claim 7, characterized in that: The fillet radius of the fillet transition is 20mm-200mm.

9. The shaft system structure for a wind turbine generator set according to any one of claims 1 to 8, characterized in that: The first bearing support section (210) is an area from one end of the outer shaft (200) to a portion of the outer shaft (200) overlapping with the first bearing (300) in the axial direction, the second bearing support section (220) is an area from the other end of the outer shaft (200) to a portion of the outer shaft (200) overlapping with the second bearing (400) in the axial direction, and the first connecting section (230) is an area between the first bearing support section (210) and the second bearing support section (220).

10. A wind turbine generator set, characterized in that: The wind turbine generator set comprises a shaft system structure for a wind turbine generator set according to any one of claims 1 to 9, wherein the inner shaft (100) is connected to one of an impeller and a nacelle of the wind turbine generator set, and the outer shaft (200) is connected to the other of the impeller and the nacelle.

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