Shaft system structure for wind turbine generator set and wind turbine generator set

Abstract

The present invention provides a shaft system structure for a wind turbine generator set and a wind turbine generator set. The shaft system structure includes an inner shaft, an outer shaft arranged outside the inner shaft, and a bearing. The bearing is installed at one end of the shaft system structure and arranged between the inner shaft and the outer shaft. In the axial direction of the shaft system structure, the outer shaft includes a first bearing support section located at the first end of the outer shaft for supporting the bearing and a first connecting section connecting the first bearing support section and the second end of the outer shaft to each other, and at least a part of the outer wall surface of the axial section of the first connecting section is in a circular arch shape. The shaft system structure for a wind turbine generator set according to the present invention can have improved rigidity.

Description

Technical Field

[0001] 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

[0002] Wind turbines convert wind energy into kinetic energy through the rotation of the impeller and then transfer it to the generator, which converts the kinetic energy into electrical energy. In wind turbines, the shaft structure not only transmits torque, but also bears various complex alternating loads, such as radial loads, axial loads, bending moments, etc. The structure and stress conditions are relatively complex, especially during the operation of wind turbines, which are affected by various factors and are prone to various faults. Therefore, the safety performance of the shaft structure plays a vital role in the normal operation of wind turbines.

[0003] In addition, as the power of wind turbines gradually increases, the load on the shaft structure also increases sharply, and the corresponding shaft structure size also increases sharply. As market competition intensifies, the unit cost requirements of wind turbines are getting lower and lower, and the reliability requirements are getting higher and higher. The manufacturing cost of the existing shaft structure has increased sharply, and the process is also difficult to implement.

[0004] Therefore, the shaft system structure of wind turbines faces the dual challenges of performance and manufacturing cost. Summary of the invention

[0005] An object of the present invention is to provide a shaft system structure for a wind turbine generator set and a wind turbine generator set with improved rigidity.

[0006] According to one aspect of the present invention, there is provided a shaft system structure for a wind turbine generator set, the shaft system structure comprising an inner shaft, an outer shaft arranged outside the inner shaft, and a bearing, the bearing being mounted at one end of the shaft system structure and arranged between the inner shaft and the outer shaft, and in the axial direction of the shaft system structure, the outer shaft comprising a first bearing support section located at a first end of the outer shaft for supporting the bearing and a first connecting section connecting the first bearing support section and the second end of the outer shaft to each other, at least a portion of an outer wall surface of an axial cross section of the first connecting section being in a circular arch shape.

[0007] Optionally, in the direction from the first end to the second end of the outer shaft, 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.

[0008] Optionally, the second outer section is an oblique arch with a first slope, and the first slope is 5°-7° relative to the outer circumference of the first bearing support section. The curvature radius of the first outer section is 150mm-250mm, and the curvature radius of the third outer section is 400mm-600mm. When the axial length of the first connecting section is L 1 When the axial length of the first outer section and the third outer section is 10% L 1 -20%L 1 .

[0009] Optionally, it is characterized in that at least a portion of the inner wall surface of the axial cross section of the first connecting segment is in a circular arch shape.

[0010] Optionally, in the direction from the first end to the second end of the outer shaft, the inner wall surface of the first connecting section includes a first inner section, a second inner section and a third inner section connected in sequence, the first inner section and the third inner section are circular arches, and the second inner section is an oblique arch.

[0011] Optionally, the second inner section is an oblique arch with a second slope, and the second slope is 5°-7° relative to the outer circumference of the first bearing support section. The curvature radius of the first inner section is 150mm-250mm, and the curvature radius of the third inner section is 400mm-600mm. When the axial length of the first connecting section is L 1 When the axial length of the first inner section and the third inner section is 10% L 1 -20%L 1 .

[0012] Optionally, the outer wall surface of the first connecting section is in a circular arch shape. In the direction from the first end to the second end of the outer shaft, the inner wall surface of the first connecting section includes a first inner section, a second inner section and a third inner section connected in sequence, and the first inner section, the second inner section and the third inner section are all in a circular arch shape.

[0013] Optionally, the curvature radius of the outer wall of the first connecting section is 1000mm-15000mm. The curvature radius of the first inner section is 150mm-250mm, the curvature radius of the second inner section is 1000mm-15000mm, and the curvature radius of the third inner section is 400mm-600mm. When the axial length of the first connecting section is L 2 When the axial length of the first inner section and the third inner section is 10% L 2 -20%L 2 .

[0014] According to another aspect of the present invention, there is provided a shaft system structure for a wind turbine generator set, the shaft system structure comprising an inner shaft, an outer shaft arranged outside the inner shaft, and a bearing, the bearing being mounted at one end of the shaft system structure and arranged between the inner shaft and the outer shaft, and in the axial direction of the shaft system structure, the inner shaft comprises a second bearing support section located at a first end of the inner shaft for supporting the bearing and a second connecting section connecting the second bearing support section and the second end of the inner shaft to each other, and at least a portion of an outer wall surface of an axial cross section of the second connecting section is in a circular arch shape.

[0015] Optionally, in the direction from the first end to the second end of the inner shaft, the outer wall surface of the second connecting section includes a fourth outer section, a fifth outer section and a sixth outer section connected in sequence, the fourth outer section and the sixth outer section are circular arches, and the fifth outer section is an oblique arch.

[0016] Optionally, the fifth outer section is an oblique arch with a third slope, and relative to the outer circumference of the second bearing support section, the third slope is 5°-7°. The radius of curvature of the fourth outer section is 150mm-250mm, and the radius of curvature of the sixth outer section is 400mm-600mm. When the axial length of the second connecting section is L 3 When the axial length of the fourth outer segment and the sixth outer segment is 10% L 3 -20%L 3 .

[0017] Optionally, at least a portion of an inner wall surface of an axial cross section of the second connecting segment is in a circular arch shape.

[0018] Optionally, in the direction from the first end to the second end of the inner shaft, the inner wall surface of the second connecting section includes a fourth inner section, a fifth inner section and a sixth inner section connected in sequence, the fourth inner section and the sixth inner section are circular arches, and the fifth inner section is an oblique arch.

[0019] Optionally, the fifth inner section is an oblique arch with a fourth slope, and relative to the outer circumference of the second bearing support section, the fourth slope is 5°-7°. The curvature radius of the fourth inner section is 150mm-250mm, and the curvature radius of the sixth inner section is 400mm-600mm. When the axial length of the second connecting section is L 3 When the axial length of the fourth inner section and the sixth inner section is 10% L 3 -20%L 3 .

[0020] Optionally, the outer wall surface of the second connecting section is in a circular arch shape. In the direction from the first end to the second end of the inner shaft, the inner wall surface of the second connecting section includes a fourth inner section, a fifth inner section and a sixth inner section connected in sequence, and the fourth inner section, the fifth inner section and the sixth inner section are all in a circular arch shape.

[0021] Optionally, the curvature radius of the outer wall of the second connecting section is 1000mm-15000mm. The curvature radius of the fourth inner section is 150mm-250mm, the curvature radius of the fifth inner section is 1000mm-15000mm, and the curvature radius of the sixth inner section is 400mm-600mm. When the axial length of the second connecting section is L 4 When the axial length of the fourth inner section and the sixth inner section is 10% L 4 -20%L 4 .

[0022] According to another aspect of the present invention, a wind turbine generator set is provided, comprising the shaft system structure for the 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.

[0023] According to the shaft system structure of the present invention, the rigidity 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 of the motor air gap can be reduced.

[0024] In addition, since the shaft system structure according to the embodiment of the present invention has improved rigidity, 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and other objects and features of the present invention will become more apparent through the following description in conjunction with the accompanying drawings, in which:

[0026] Figure 1 is a schematic diagram of a shaft system structure for a wind turbine generator set according to a first embodiment of the present invention;

[0027] Figure 2 is a schematic diagram of a shaft system structure for a wind turbine generator set according to a second embodiment of the present invention;

[0028] Figure 3 is a schematic diagram of a shaft system structure for a wind turbine generator set according to a third embodiment of the present invention;

[0029] Figure 4 Schematic diagram of a shaft system structure for a wind turbine generator set according to a fourth embodiment of the present invention.

[0030] In the accompanying drawings: 100 is the inner shaft, 200 is the outer shaft, 100a is the first end of the inner shaft, 100b is the second end of the inner shaft, 210 is the first bearing support section, 220 is the first connecting section, 200a is the first end of the outer shaft, 200b is the second end of the outer shaft, 221a is the first outer section, 222a is the second outer section, 223a is the third outer section, 221b is the first inner section, 222b is the second inner section, 223b is the third inner section, 110 is the second bearing support section, 120 is the second connecting section, 121a is the fourth outer section, 122a is the fifth outer section, 123a is the sixth outer section, 121b is the fourth inner section, 122b is the fifth inner section, and 123b is the sixth inner section. DETAILED DESCRIPTION

[0031] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0032] Figure 1 is a schematic diagram of a shaft system structure for a wind turbine generator set according to a first embodiment of the present invention, Figure 2 FIG. 4 is a schematic diagram of a shaft system structure for a wind turbine generator set according to a second embodiment of the present invention.

[0033] like Figure 1 and Figure 2 As shown, the shaft system structure for a wind turbine generator set according to an embodiment of the present invention includes an inner shaft 100, an outer shaft 200 arranged outside the inner shaft 100, and a bearing 300. The bearing 300 is installed at one end of the shaft system structure and is arranged between the inner shaft 100 and the outer shaft 200.

[0034] According to an embodiment of the present invention, in the axial direction of the shaft system structure, the outer shaft 200 includes a first bearing support section 210 located at a first end 200a of the outer shaft 200 for supporting the bearing 300 and a first connecting section 220 connecting the first bearing support section 210 and the second end 200b of the outer shaft 200 to each other, and at least a portion of the outer wall surface of the axial section of the first connecting section 220 is in a circular arch shape. The shaft system structure according to an embodiment of the present invention can have improved rigidity. Figure 1 and Figure 2 The specific shape of the first connecting section 220 is described in detail.

[0035] First, refer to Figure 1 The specific shape of the first connecting segment 220 of the shaft system structure according to the first embodiment of the present invention is described.

[0036] According to an embodiment of the present invention, Figure 1As shown, in the direction from the first end 200a to the second end 200b of the outer shaft 200, the outer wall surface of the first connecting section 220 includes a first outer section 221a, a second outer section 222a and a third outer section 223a which are connected in sequence, the first outer section 221a and the third outer section 223a are circular arches, and the second outer section 222a is an oblique arch.

[0037] According to an embodiment of the present invention, the second outer section 222a is an oblique arch with a first slope α1, and the first slope α1 is 5°-7° (for example, 6°) relative to the outer peripheral surface of the first bearing support section 210. When the first slope α1 is less than 5°, the slope is too small and the effect of improving the rigidity is not obvious. When the first slope α1 is greater than 7°, the slope is too large, resulting in an excessively large space occupied by the shafting structure.

[0038] According to an embodiment of the present invention, the radius of curvature of the first outer section 221a is 150mm-250mm (for example, 200mm), and the radius of curvature of the third outer section 223a is 400mm-600mm (for example, 500mm). When the radius of curvature of the first outer section 221a is less than 150mm, and the radius of curvature of the third outer section 223a is less than 400mm, the formed arch is too small, resulting in insignificant improvement in stiffness. When the radius of curvature of the first outer section 221a is greater than 250mm, and the radius of curvature of the third outer section 223a is greater than 600mm, the formed arch is too large, which may result in reduced stiffness.

[0039] According to an embodiment of the present invention, when the axial length of the first connecting section 220 is L 1 When the axial length of the first outer segment 221a and the third outer segment 223a is 10% L 1 -20%L 1 That is, the axial length of the second outer section 222a is 60% L 1 -80% L 1 When the curvature radius and length of each section are designed in the above manner, the outer wall surface of the first connecting section 220 can be formed to be relatively smooth, so as to improve the rigidity of the shaft system structure.

[0040] According to an embodiment of the present invention, Figure 1 As shown, at least a portion of the inner wall surface of the axial cross section of the first connecting segment 220 is in a circular arch shape.

[0041] Specifically, Figure 1 As shown, in the direction from the first end 200a to the second end 200b of the outer shaft 200, the inner wall surface of the first connecting section 220 includes a first inner section 221b, a second inner section 222b and a third inner section 223b which are connected in sequence, the first inner section 221b and the third inner section 223b are circular arches, and the second inner section 222b is an oblique arch.

[0042] According to an embodiment of the present invention, the second inner section 222b is an oblique arch with a second slope α2, and the second slope α2 is 5°-7° (for example, 6°) relative to the outer peripheral surface of the first bearing support section 210. When the second slope α2 is less than 5°, the slope is too small and the effect of improving the rigidity is not obvious. When the second slope α2 is greater than 7°, the slope is too large, resulting in an excessively large space occupied by the shafting structure.

[0043] According to an embodiment of the present invention, the radius of curvature of the first inner section 221b is 150mm-250mm, and the radius of curvature of the third inner section 223b is 400mm-600mm. When the radius of curvature of the first inner section 221b is less than 150mm, and the radius of curvature of the third inner section 223b is less than 400mm, the formed arch is too small, resulting in insignificant improvement in stiffness. When the radius of curvature of the first inner section 221b is greater than 250mm, and the radius of curvature of the third inner section 223b is greater than 600mm, the formed arch is too large, which may result in reduced stiffness.

[0044] According to an embodiment of the present invention, when the axial length of the first connecting section 220 is L 1 When the axial length of the first inner section 221b and the third inner section 223b is 10% L 1 -20%L 1 That is, the axial length of the second inner section 222b is 60% L 1 -80% L 1 When the curvature radius and length of each section are designed as described above, the inner wall surface of the first connecting section 220 can be formed to be relatively smooth, so as to improve the rigidity of the shaft system structure.

[0045] In addition, according to the embodiment of the present invention, by designing the shape and size of the first connecting section 220 as above, the first connecting section 220 can be formed into an arch shape, and the wall thickness of the first connecting section 220 can be made substantially uniform, thereby avoiding a reduction in rigidity caused by uneven wall thickness.

[0046] Below, refer to Figure 2 The specific shape of the first connecting section 220 of the shafting structure according to the second embodiment of the present invention is described.

[0047] Figure 2 FIG. 2 is a schematic diagram of a shaft system structure for a wind turbine generator set according to a second embodiment of the present invention. Figure 2 As shown, the outer wall surface of the first connecting section 220 can be in a circular arch shape as a whole. In addition, the first inner section 221b, the second inner section 222b and the third inner section 223b can all be in a circular arch shape.

[0048] According to an embodiment of the present invention, the radius of curvature of the outer wall of the first connecting section 220 is 1000mm-15000mm (for example, 10000mm). When the radius of curvature of the outer wall of the first connecting section 220 is less than 1000mm, the curvature of the outer wall of the first connecting section 220 is too large, which may not be conducive to improving the rigidity of the shafting structure. When the radius of curvature of the outer wall of the first connecting section 220 is greater than 15000mm, the arch of the outer wall of the first connecting section 220 is too small, which is also not conducive to improving the rigidity of the shafting structure.

[0049] According to an embodiment of the present invention, the curvature radius of the first inner section 221b is 150mm-250mm (for example, 200mm), the curvature radius of the second inner section 222b is 1000mm-15000mm (for example, 10000mm), and the curvature radius of the third inner section 223b is 400mm-600mm (for example, 500mm).

[0050] According to an embodiment of the present invention, when the axial length of the first connecting section 220 is L 2 When the axial length of the first inner section 221b and the third inner section 223b is 10% L 2 -20%L 2 That is, the axial length of the second inner section 222b is 60% L 1 -80% L 1 When the curvature radius and length of each section are designed in the above manner, the inner wall surface of the first connecting section 220 can be formed to be relatively smooth, so as to improve the rigidity of the shaft system structure.

[0051] In addition, according to the embodiment of the present invention, by designing the shape and size of the first connecting section 220 as above, the first connecting section 220 can be formed into an arch shape, and the wall thickness of the first connecting section 220 can be made substantially uniform, thereby avoiding a reduction in rigidity caused by uneven wall thickness.

[0052] In reference Figure 1 and Figure 2 In the described shafting structure, the inner shaft 100 does not extend toward the second end 200 b of the outer shaft 200 except for supporting the bearing 300 , however, the structure and form of the inner shaft 100 are not particularly limited.

[0053] Figure 3 is a schematic diagram of a shaft system structure for a wind turbine generator set according to a third embodiment of the present invention, Figure 4 Schematic diagram of a shaft system structure for a wind turbine generator set according to a fourth embodiment of the present invention.

[0054] like Figure 3 and Figure 4As shown, the shaft system structure for a wind turbine generator set according to an embodiment of the present invention includes an inner shaft 100, an outer shaft 200 arranged outside the inner shaft 100, and a bearing 300. The bearing 300 is installed at one end of the shaft system structure and is arranged between the inner shaft 100 and the outer shaft 200.

[0055] like Figure 3 and Figure 4 As shown, in the axial direction of the shaft system structure, the inner shaft 100 includes a second bearing support section 110 located at the first end 100a of the inner shaft 100 for supporting the bearing 300 and a second connecting section 120 connecting the second bearing support section 110 and the second end 100b of the inner shaft 100 to each other, and at least a part of the outer wall surface of the axial section of the second connecting section 120 is in a circular arch shape. The shaft system structure according to the embodiment of the present invention can have improved rigidity. Figure 3 and Figure 4 The specific shape of the second connecting section 120 is described in detail.

[0056] First, refer to Figure 3 The specific shape of the second connecting section 120 of the shafting structure according to the third embodiment of the present invention is described.

[0057] According to an embodiment of the present invention, Figure 3 As shown, in the direction from the first end 100a to the second end 100b of the inner shaft 100, the outer wall surface of the second connecting section 120 includes a fourth outer section 121a, a fifth outer section 122a and a sixth outer section 123a which are connected in sequence, the fourth outer section 121a and the sixth outer section 123a are circular arches, and the fifth outer section 122a is an oblique arch.

[0058] According to an embodiment of the present invention, the fifth outer section 122a is an oblique arch with a third slope α3, and the third slope α3 is 5°-7° (for example, 6°) relative to the outer peripheral surface of the second bearing support section 110. When the third slope α3 is less than 5°, the slope is too small and the effect of improving the rigidity is not obvious. When the third slope α3 is greater than 7°, the slope is too large, resulting in an excessively large space occupied by the shafting structure.

[0059] According to an embodiment of the present invention, the radius of curvature of the fourth outer section 121a is 150mm-250mm (for example, 200mm), and the radius of curvature of the sixth outer section 123a is 400mm-600mm (for example, 500mm). When the radius of curvature of the fourth outer section 121a is less than 150mm, and the radius of curvature of the sixth outer section 123a is less than 400mm, the formed arch is too small, resulting in insignificant improvement in rigidity. When the radius of curvature of the fourth outer section 121a is greater than 250mm, and the radius of curvature of the sixth outer section 123a is greater than 600mm, the formed arch is too large, which may result in reduced rigidity.

[0060] According to an embodiment of the present invention, when the axial length of the second connecting section 120 is L 3 When the axial length of the fourth outer segment 121a and the sixth outer segment 123a is 10% L 3 -20%L 3 That is, the axial length of the fifth outer segment 122a is 60% L 1 -80% L 1 When the curvature radius and length of each section are designed in the above manner, the outer wall surface of the first connecting section 220 can be formed to be relatively smooth, so as to improve the rigidity of the shaft system structure.

[0061] According to an embodiment of the present invention, Figure 3 As shown, at least a portion of the inner wall surface of the axial cross section of the second connecting segment 120 is in a circular arch shape.

[0062] Specifically, Figure 3 As shown, in the direction from the first end 100a to the second end 100b of the inner shaft 100, the inner wall surface of the second connecting section 120 includes a fourth inner section 121b, a fifth inner section 122b and a sixth inner section 123b which are connected in sequence, the fourth inner section 121b and the sixth inner section 123b are circular arches, and the fifth inner section 122b is an oblique arch.

[0063] According to an embodiment of the present invention, the fifth inner section 122b is an oblique arch with a fourth slope α4, and the fourth slope α4 is 5°-7° (for example, 6°) relative to the outer peripheral surface of the second bearing support section 110. When the fourth slope α4 is less than 5°, the slope is too small and the effect of improving the rigidity is not obvious. When the fourth slope α4 is greater than 7°, the slope is too large, resulting in an excessively large space occupied by the shafting structure.

[0064] According to an embodiment of the present invention, the radius of curvature of the fourth inner section 121b is 150mm-250mm, and the radius of curvature of the sixth inner section 123b is 400mm-600mm. When the radius of curvature of the fourth inner section 121b is less than 150mm, and the radius of curvature of the sixth inner section 123b is less than 400mm, the formed arch is too small, resulting in insignificant improvement in rigidity. When the radius of curvature of the fourth inner section 121b is greater than 250mm, and the radius of curvature of the sixth inner section 123b is greater than 600mm, the formed arch is too large, which may result in reduced rigidity.

[0065] According to an embodiment of the present invention, when the axial length of the second connecting section 120 is L 3 When the axial length of the fourth inner section 121b and the sixth inner section 123b is 10% L 3 -20%L 3 That is, the axial length of the fifth inner section 122b is 60% L1 -80% L 1 When the curvature radius and length of each section are designed as described above, the inner wall surface of the second connecting section 120 can be formed to be relatively smooth, so as to improve the rigidity of the shaft system structure.

[0066] In addition, according to the embodiment of the present invention, by designing the shape and size of the second connecting section 120 as above, the second connecting section 120 can be formed into an arch shape, and the wall thickness of the second connecting section 120 can be made substantially uniform, thereby avoiding a reduction in rigidity caused by uneven wall thickness.

[0067] Below, refer to Figure 4 The specific shape of the second connecting section 120 of the shafting structure according to the fourth embodiment of the present invention is described.

[0068] Figure 4 FIG. 4 is a schematic diagram of a shaft system structure for a wind turbine generator set according to a fourth embodiment of the present invention. Figure 4 As shown, the outer wall surface of the second connecting section 120 can be in a circular arch shape as a whole. In addition, the fourth inner section 121b, the fifth inner section 122b and the sixth inner section 123b can all be in a circular arch shape.

[0069] According to an embodiment of the present invention, the radius of curvature of the outer wall of the second connecting section 120 is 1000mm-15000mm. When the radius of curvature of the outer wall of the second connecting section 120 is less than 1000mm, the curvature of the outer wall of the second connecting section 120 is too large, which may not be conducive to improving the rigidity of the shafting structure. When the radius of curvature of the outer wall of the second connecting section 120 is greater than 15000mm, the arch of the outer wall of the second connecting section 120 is too small, which is also not conducive to improving the rigidity of the shafting structure.

[0070] According to an embodiment of the present invention, the radius of curvature of the fourth inner section 121b is 150 mm-250 mm, the radius of curvature of the fifth inner section 122b is 1000 mm-15000 mm, and the radius of curvature of the sixth inner section 123b is 400 mm-600 mm.

[0071] According to an embodiment of the present invention, when the axial length of the second connecting section 120 is L 4 When the axial length of the fourth inner section 121b and the sixth inner section 123b is 10% L 4 -20%L 4 When the curvature radius and length of each section are designed in the above manner, the inner wall surface of the second connecting section 120 can be formed to be relatively smooth, so as to improve the rigidity of the shaft system structure.

[0072] In addition, according to the embodiment of the present invention, by designing the shape and size of the second connecting section 120 as above, the second connecting section 120 can be formed into an arch shape, and the wall thickness of the second connecting section 120 can be made substantially uniform, thereby avoiding a reduction in rigidity caused by uneven wall thickness.

[0073] In reference Figure 3 and Figure 4 In the described shafting structure, the outer shaft 200 does not extend toward the second end 100 b of the inner shaft 100 except for supporting the bearing 300 , however, the structure and form of the outer shaft 200 are not particularly limited.

[0074] In addition, Figures 1 to 4 In the embodiment 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 is a fixed shaft, and the outer shaft 200 is a movable shaft. Alternatively, the inner shaft 100 is a movable shaft, and the outer shaft 200 is a fixed shaft. The inner shaft 100 and the outer shaft 200 can be in the same form as Figures 1 to 4 The embodiments shown in the drawings may have different forms, for example, different lengths or different cross-sections, and the length and cross-sectional form are not particularly limited.

[0075] The specific type of the bearing 300 is not limited. For example, the bearing 300 may be a sliding bearing or a rolling bearing. As an example, the bearing 300 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).

[0076] The size of the bearing 300 is also not limited. Based on the application of the wind power bearing, the inner diameter of the bearing 300 can be 300mm-4800mm, and the outer diameter can be 500mm-5000mm.

[0077] 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 may include the shaft system structure as described above, that is, Figure 1 , Figure 2 , Figure 3 or Figure 4 The shaft system structure shown in FIG. 1 , wherein 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.

[0078] 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 condition inside the bearing, and reduce the change of the motor air gap.

[0079] In addition, since the shaft system structure according to the embodiment of the present invention has improved rigidity, 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.

[0080] 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 bearing (300), wherein the bearing (300) is installed at one end of the shaft system structure and is arranged between the inner shaft (100) and the outer shaft (200), It is characterized in that In the axial direction of the shaft system structure, the outer shaft (200) comprises a first bearing support section (210) located at a first end (200a) of the outer shaft (200) for supporting the bearing (300), and a first connecting section (220) connecting the first bearing support section (210) and the second end (200b) of the outer shaft (200) to each other, wherein at least a portion of an outer wall surface of an axial cross section of the first connecting section (220) is in a circular arch shape. Wherein, in a radial direction of the shaft system structure perpendicular to the axial direction, the inner shaft (100) does not overlap with the first connecting section (220), and the bearing (300) is only arranged between the first bearing support section (210) and the inner shaft (100).

2. The shaft system structure for a wind turbine generator set according to claim 1, characterized in that: In a direction from the first end (200a) to the second end (200b) of the outer shaft (200), the outer wall surface of the first connecting section (220) comprises a first outer section (221a), a second outer section (222a) and a third outer section (223a) which are connected in sequence, the first outer section (221a) and the third outer section (223a) being circular arches, and the second outer section (222a) being oblique arches.

3. The shaft system structure for a wind turbine generator set according to claim 2, characterized in that: The second outer section (222a) is an oblique arch with a first slope (α1); relative to the outer circumferential surface of the first bearing support section (210), the first slope (α1) is 5°-7°. The radius of curvature of the first outer section (221a) is 150 mm-250 mm, the radius of curvature of the third outer section (223a) is 400 mm-600 mm, and when the axial length of the first connecting section (220) is L1, the axial lengths of the first outer section (221a) and the third outer section (223a) are 10% L1-20% L1.

4. The shaft system structure for a wind turbine generator set according to any one of claims 1 to 3, characterized in that: At least part of the inner wall surface of the axial cross section of the first connecting section (220) is 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: In the direction from the first end (200a) to the second end (200b) of the outer shaft (200), the inner wall surface of the first connecting section (220) comprises a first inner section (221b), a second inner section (222b) and a third inner section (223b) which are connected in sequence, the first inner section (221b) and the third inner section (223b) are circular arches, and the second inner section (222b) is an oblique arch.

6. The shaft system structure for a wind turbine generator set according to claim 5, characterized in that: The second inner section (222b) is an oblique arch with a second slope (α2); relative to the outer circumferential surface of the first bearing support section (210), the second slope (α2) is 5°-7°. The radius of curvature of the first inner section (221b) is 150mm-250mm, the radius of curvature of the third inner section (223b) is 400mm-600mm, and when the axial length of the first connecting section (220) is L1, the axial lengths of the first inner section (221b) and the third inner section (223b) are 10%L1-20%L1.

7. 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 (220) is in a circular arch shape. In the direction from the first end (200a) to the second end (200b) of the outer shaft (200), the inner wall surface of the first connecting section (220) comprises a first inner section (221b), a second inner section (222b) and a third inner section (223b) which are connected in sequence, and the first inner section (221b), the second inner section (222b) and the third inner section (223b) are all in the shape of circular arches.

8. The shaft system structure for a wind turbine generator set according to claim 7, characterized in that: The curvature radius of the outer wall surface of the first connecting section (220) is 1000 mm-15000 mm, The radius of curvature of the first inner section (221b) is 150mm-250mm, the radius of curvature of the second inner section (222b) is 1000mm-15000mm, the radius of curvature of the third inner section (223b) is 400mm-600mm, and when the axial length of the first connecting section (220) is L2, the axial lengths of the first inner section (221b) and the third inner section (223b) are 10%L2-20%L2.

9. 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 bearing (300), wherein the bearing (300) is installed at one end of the shaft system structure and is arranged between the inner shaft (100) and the outer shaft (200), It is characterized in that In the axial direction of the shaft system structure, the inner shaft (100) comprises a second bearing support section (110) located at a first end (100a) of the inner shaft (100) for supporting the bearing (300), and a second connecting section (120) connecting the second bearing support section (110) and the second end (100b) of the inner shaft (100) to each other, wherein at least a portion of an outer wall surface of an axial cross section of the second connecting section (120) is in a circular arch shape. Wherein, in a radial direction of the shaft system structure perpendicular to the axial direction, the outer shaft (200) does not overlap with the second connecting section (120), and the bearing (300) is only arranged between the second bearing support section (110) and the outer shaft (200).

10. The shaft system structure for a wind turbine generator set according to claim 9, characterized in that: In a direction from the first end (100a) to the second end (100b) of the inner shaft (100), the outer wall surface of the second connecting section (120) comprises a fourth outer section (121a), a fifth outer section (122a) and a sixth outer section (123a) which are connected in sequence, the fourth outer section (121a) and the sixth outer section (123a) being circular arches, and the fifth outer section (122a) being oblique arches.

11. The shaft system structure for a wind turbine generator set according to claim 10, characterized in that: The fifth outer section (122a) is an oblique arch with a third slope (α3); relative to the outer circumferential surface of the second bearing support section (110), the third slope (α3) is 5°-7°, The radius of curvature of the fourth outer section (121a) is 150 mm-250 mm, the radius of curvature of the sixth outer section (123a) is 400 mm-600 mm, and when the axial length of the second connecting section (120) is L3, the axial lengths of the fourth outer section (121a) and the sixth outer section (123a) are 10% L3-20% L3.

12. The shaft system structure for a wind turbine generator set according to any one of claims 9 to 11, characterized in that: At least part of the inner wall surface of the axial cross section of the second connecting section (120) is in the shape of a circular arch.

13. The shaft system structure for a wind turbine generator set according to claim 12, characterized in that: In the direction from the first end (100a) to the second end (100b) of the inner shaft (100), the inner wall surface of the second connecting section (120) comprises a fourth inner section (121b), a fifth inner section (122b) and a sixth inner section (123b) which are connected in sequence, the fourth inner section (121b) and the sixth inner section (123b) are circular arches, and the fifth inner section (122b) is an oblique arch.

14. The shaft system structure for a wind turbine generator set according to claim 13, characterized in that: The fifth inner section (122b) is an oblique arch with a fourth slope (α4); relative to the outer circumferential surface of the second bearing support section (110), the fourth slope (α4) is 5°-7°, The radius of curvature of the fourth inner section (121b) is 150 mm-250 mm, the radius of curvature of the sixth inner section (123b) is 400 mm-600 mm, and when the axial length of the second connecting section (120) is L3, the axial lengths of the fourth inner section (121b) and the sixth inner section (123b) are 10% L3-20% L3.

15. The shaft system structure for a wind turbine generator set according to claim 9, characterized in that: The outer wall surface of the second connecting section (120) is in the shape of a circular arch. In the direction from the first end (100a) to the second end (100b) of the inner shaft (100), the inner wall surface of the second connecting section (120) comprises a fourth inner section (121b), a fifth inner section (122b) and a sixth inner section (123b) which are connected in sequence, and the fourth inner section (121b), the fifth inner section (122b) and the sixth inner section (123b) are all in the shape of circular arches.

16. The shaft system structure for a wind turbine generator set according to claim 15, characterized in that: The curvature radius of the outer wall surface of the second connecting section (120) is 1000 mm-15000 mm, The radius of curvature of the fourth inner section (121b) is 150mm-250mm, the radius of curvature of the fifth inner section (122b) is 1000mm-15000mm, the radius of curvature of the sixth inner section (123b) is 400mm-600mm, and when the axial length of the second connecting section (120) is L4, the axial lengths of the fourth inner section (121b) and the sixth inner section (123b) are 10%L4-20%L4.

17. 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 16, 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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