CN113294285A

CN113294285A - Blade and wind generating set

Info

Publication number: CN113294285A
Application number: CN202110346947.8A
Authority: CN
Inventors: 郭光星; 张磊
Original assignee: Jiangsu Goldwind Science and Technology Co Ltd
Current assignee: Jiangsu Goldwind Science and Technology Co Ltd
Priority date: 2021-03-31
Filing date: 2021-03-31
Publication date: 2021-08-24
Anticipated expiration: 2041-03-31
Also published as: CN113294285B

Abstract

The invention relates to a blade and a wind generating set, the blade comprises: the blade body is provided with a blade tip part, a blade root part and a maximum chord length part, wherein the blade tip part and the blade root part are arranged oppositely, and the maximum chord length part is positioned between the blade tip part and the blade root part; the length dimension of the blade root in the chord direction of the blade body is larger than the length dimension of the blade root in the width direction of the blade body and is smaller than or equal to the length dimension of the maximum chord length part in the chord direction, and the width direction, the axial direction and the chord direction are mutually perpendicular. According to the blade and the wind generating set provided by the embodiment of the invention, the blade can ensure the wind energy utilization rate of the wind generating set and improve the power generation benefit of the wind generating set.

Description

Blade and wind generating set

Technical Field

The invention relates to the technical field of wind power, in particular to a blade and a wind generating set.

Background

With the development of human society, the demand for electric energy is larger and larger, the traditional coal-fired power generation mode is slowly replaced by new energy power generation, and wind power generation is one of important power generation means, so that the application of a wind generating set is wider and wider. The wind generating set mainly comprises a generator, a hub, blades and other electrical components, and the impeller can drive a rotor of the generator to rotate relative to a stator under the action of wind energy, so that the conversion from the wind energy to electric energy is realized.

The blades of the impeller are important parts, and the safety performance of the impeller directly influences the power generation benefit of the wind generating set. In the existing blade, the blade root part of the blade is mostly in a cylindrical structure, however, the cross section at the maximum chord length of the blade is in a large-thickness blunt trailing edge airfoil shape, and the overall appearance is not circular, so that the shape change of the transition curved surface from the cylindrical blade root part to the airfoil shape at the maximum chord length is obvious. In order to ensure the fatigue performance of the transition curved surface, the wall thickness of the transition curved surface needs to be increased, and the large wall thickness of the blade can cause the risk of stalling of the wind generating set during operation, so that the wind energy utilization rate is influenced.

Therefore, a new blade and a wind turbine generator set are needed.

Disclosure of Invention

The embodiment of the invention provides a blade and a wind generating set, wherein the blade can ensure the wind energy utilization rate of the wind generating set and improve the power generation benefit of the wind generating set.

In one aspect, an embodiment of the present invention provides a blade, including: the blade body is provided with a blade tip part, a blade root part and a maximum chord length part, wherein the blade tip part and the blade root part are oppositely arranged in the axial direction of the blade body; the length dimension of the blade root in the chord direction of the blade body is larger than the length dimension of the blade root in the width direction of the blade body and is smaller than or equal to the length dimension of the maximum chord length part in the chord direction, the width direction, the axial direction and the chord direction are mutually vertical, and the blade body is in smooth curved surface transition from the maximum chord length part to the blade root.

According to an aspect of the embodiment of the present invention, in the chord direction, the length dimension of the blade root portion is equal to or less than 0.8 times the length dimension of the maximum chord length portion.

According to an aspect of an embodiment of the invention, the root portion of the blade is of an axisymmetric structure, and the axis of symmetry of the root portion of the blade extends in a chord-wise direction.

According to an aspect of an embodiment of the invention, a length dimension of an end surface of the root portion on a side facing away from the tip portion in the width direction is equal to a length dimension of the maximum chord length portion.

According to an aspect of the embodiment of the present invention, an outer contour of an end surface of the root portion on a side axially away from the tip portion is an ellipse, a major axis direction of the ellipse is coincident with a chord direction, and a minor axis direction is coincident with a width direction.

According to one aspect of the embodiment of the invention, the outer contour of the end surface of the blade root part on the side departing from the blade tip part in the axial direction is in a waist circle shape, two arc sections of the waist circle shape are oppositely distributed in the chord direction, and two straight line sections are oppositely distributed in the width direction.

According to one aspect of the embodiment of the invention, the blade root part is a structural body with a uniform cross section within a predetermined length along the axial direction, and the predetermined length is in a range of 1.5m to 2 m.

According to an aspect of the embodiment of the present invention, the blade further includes a switching assembly, the switching assembly is disposed at one end of the blade body in the axial direction, the switching assembly includes a first connecting section and a second connecting section, the first connecting section matches with the blade root in shape and is connected to the blade root, and the second connecting section is disposed at a side of the first connecting section away from the blade body and is used for being connected to the hub.

According to an aspect of the embodiment of the present invention, in the chord direction, a length dimension of the first connecting section facing the one-side end surface of the blade root is 1.2 times or more a length dimension of the one-side end surface of the first connecting section facing away from the second connecting section.

According to an aspect of the embodiment of the present invention, the first connection section is a uniform cross-section structural body in the axial direction, the first connection section is provided with a plurality of first connection holes, the plurality of first connection holes are distributed at intervals along the first annular track, each first connection hole is arranged to penetrate through the first connection section in the axial direction, and the first fastening member is arranged in the first connection hole to be connected with the blade body.

According to one aspect of the embodiment of the invention, an outer contour of an end face of the second connecting section on a side away from the first connecting section is circular, the second connecting section is provided with a plurality of second connecting holes, the plurality of second connecting holes are distributed at intervals along a second annular track, and each second connecting hole penetrates through the second connecting section in the axial direction and is used for being connected with the hub.

According to an aspect of the embodiment of the present invention, the second connecting section is a constant cross-section structural body in the axial direction.

According to an aspect of an embodiment of the present invention, the adapter assembly further comprises a reinforcement member connected between the first connection section and the second connection section.

According to an aspect of the embodiment of the present invention, the reinforcing member includes a plurality of reinforcing plates disposed around the second connecting section, each of the reinforcing plates being connected to the first connecting section and the second connecting section, respectively.

According to an aspect of the embodiment of the present invention, the reinforcing member includes a ring-shaped structural body disposed around an outer periphery of the second connecting section and connected to the first connecting section and the second connecting section, respectively.

According to an aspect of the embodiment of the present invention, the cross-sectional area of the reinforcing member gradually increases from the end surface of the second connecting section facing away from the first connecting section to the first connecting section.

According to an aspect of an embodiment of the invention, the blade body has a larger wall thickness in the width direction than in the chord direction.

In another aspect, a wind turbine generator system according to an embodiment of the present invention includes: a hub; the blade is connected to the hub.

According to the blade and the wind generating set provided by the embodiment of the invention, the blade comprises the blade body, the blade body is provided with the blade tip part, the blade root part and the maximum chord length part positioned between the blade tip part and the blade root part which are oppositely arranged in the self axial direction, the length dimension of the blade root part in the chord direction of the blade body is larger than the length dimension of the blade root part in the width direction of the blade body and is smaller than or equal to the length dimension of the maximum chord length part in the chord direction, and the width direction, the axial direction and the chord direction are mutually vertical, so that the curved surface of the blade from the maximum chord length part to the blade root part can be smoothly transited and is more continuous, and the transition curved surface of the blade from the maximum chord length part to the blade root part can meet the integral fatigue performance requirement of the blade by adopting smaller thickness. Moreover, the transition curved surface adopts smaller wall thickness, so that the stall risk of a wind generating set applied to the blade can be reduced, the wind energy utilization rate is improved, and the power generation benefit of the wind generating set is ensured.

Drawings

Features, advantages and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic structural view of a wind turbine generator system according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of a blade according to an embodiment of the present invention;

FIG. 3 is a side view of a blade of one embodiment of the present invention;

FIG. 4 is a characteristic graph of wind energy utilization of a blade according to an embodiment of the present invention and a conventional blade;

FIG. 5 is a schematic structural view of a blade according to another embodiment of the present invention;

FIG. 6 is a block diagram illustrating a transition assembly in accordance with one embodiment of the present invention;

FIG. 7 is a side view of a transition assembly of one embodiment of the present invention;

FIG. 8 is a side view of a transition assembly of another embodiment of the present invention;

FIG. 9 is a side view of a transition assembly of yet another embodiment of the present invention;

fig. 10 is a schematic structural diagram of an adapter assembly according to yet another embodiment of the present invention.

Wherein:

100-blade;

10-leaf body; 11-tip part; 12-leaf root; 121-fixing holes; 13-maximum chord length portion;

20-a transition component; 21-a first connection section; 211 — a first connection hole; 22-a second connection section; 221-a second connection hole; 23-a reinforcing component; aa-a first circular trajectory; bb-a second circular trajectory; 24-a through-hole;

30-a first fastener;

40-a second fastener;

200-a hub;

300-a tower;

400-a nacelle;

500-a generator;

x-axial direction; y-chord direction; z-width direction.

In the drawings, like parts are provided with like reference numerals. The figures are not drawn to scale.

Detailed Description

Features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention. In the drawings and the following description, at least some well-known structures and techniques have not been shown in detail in order to avoid unnecessarily obscuring the present invention; also, the dimensions of some of the structures may be exaggerated for clarity. Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

The following description is given with the directional terms shown in the drawings and is not intended to limit the specific structure of the blade and the wind turbine generator system of the present invention. In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, e.g., as either a fixed connection, a removable connection, or an integral connection; can be directly connected or indirectly connected. The specific meaning of the above terms in the present invention can be understood as appropriate to those of ordinary skill in the art.

As shown in fig. 1, the wind turbine generator set provided by the embodiment of the present invention includes a tower 300, a nacelle 400, a generator 500, a hub 200, and a blade 100. The tower 300 is connected to a wind turbine foundation, the nacelle 400 is disposed on top of the tower 300, the nacelle 400 includes a base by which the nacelle 400 can be connected to the tower 300, and the generator 500 is disposed on the nacelle 400. In some examples, generator 500 may be located outside of nacelle 400, although in some examples, generator 500 may also be located inside of nacelle 400. The number of blades 100 may be plural and spaced around the axis of the hub 200, and illustratively, the number of blades 100 may be three. The generator 500 comprises a rotor, which may be connected to the hub 200, and a stator, which may be connected to the base of the nacelle 400. When wind acts on the blade 100, the blade 100 drives the hub 200 to rotate, and further drives the rotor of the generator 500 to rotate relative to the stator, so as to meet the power generation requirement of the wind generating set.

Most of the blades of the existing wind generating set adopt a circular blade root scheme. However, the cross-sectional profile at the maximum chord length of the blade is a blunt trailing edge airfoil with large thickness, so that the shape change of the transition curved surface of the airfoil from the circular blade root to the maximum chord length is obvious. With the continuous increase of the size of the blade, the shimmy load is continuously increased, the length of the transition section of the blade is increased, and higher requirements are provided for the structural strength and the fatigue performance of the blade. In order to ensure the fatigue performance of the transition curved surface, the wall thickness of the transition curved surface needs to be increased, and the large wall thickness of the blade can cause the risk of stalling of the wind generating set during operation, so that the wind energy utilization rate is influenced. Based on this, the embodiment of the invention provides a new blade 100, which can reduce the probability of stall risk generated when a wind generating set to which the blade 100 is applied is used, improve the wind energy utilization rate, and ensure the power generation benefit of the wind generating set.

For a better understanding of the invention, a blade 100 and a wind park according to an embodiment of the invention are described in detail below with reference to fig. 2 to 10.

As shown in fig. 2 and 3, a blade 100 according to an embodiment of the present invention includes a blade body 10, and the blade body 10 has a tip portion 11, a root portion 12, and a maximum chord length portion 13 between the tip portion 11 and the root portion 12, which are oppositely arranged in an axial direction X of the blade body 10. The length dimension H1 of the blade root 12 in the chord direction Y of the blade body 10 is greater than the length dimension H2 of the blade root 12 in the width direction Z of the blade body 10 and is less than or equal to the length dimension H3 of the maximum chord length part 13 in the chord direction Y, the width direction Z, the axial direction X and the chord direction Y are mutually perpendicular, and the blade body 10 is in smooth curved surface transition from the maximum chord length part 13 to the blade root part 12.

In order to evaluate the influence of the profile of the blade root 12 on the power generation efficiency, a certain type of blade 100 of the order of eighty meters was simulated. Referring to fig. 4, a dotted line in fig. 4 represents a characteristic curve of wind energy utilization efficiency of the blade in the related art, and a solid line represents a characteristic curve of wind energy utilization efficiency of the blade 100 according to the embodiment of the present application, wherein an abscissa represents a tip speed ratio and an ordinate represents a wind energy utilization rate.

The graph result of fig. 4 shows that, compared with the blade 100 adopting the circular blade root 12 in the prior art, the blade 100 provided in the embodiment of the present application has a higher wind energy utilization rate (increased by about 4.3%) in the whole operation stage, and the wall thickness of the blade 100 is thinner than that of the blade in the prior art, so that the blade can be driven at a low wind speed, and further, the power generation amount of the wind turbine generator system can be increased in a low wind speed region.

That is to say, in the blade 100 according to the embodiment of the present invention, the blade body 10 is in smooth curved surface transition from the maximum chord length portion 13 to the blade root portion 12, because the length dimension H1 of the blade root portion 12 in the chord direction Y of the blade body 10 is greater than the length dimension H2 of the blade root portion 12 in the width direction Z of the blade body 10 and is less than or equal to the length dimension H3 of the maximum chord length portion 13 in the chord direction Y, and the width direction Z, the axial direction X and the chord direction Y are perpendicular to each other, the curved surface of the blade 100 from the maximum chord length portion 13 to the blade root portion 12 can be in smooth transition and more continuous, the continuity and the structural performance of the profile of the blade root portion 12 are improved, and the transition curved surface of the blade 100 in the region from the maximum chord length portion 13 to the blade root portion 12 can meet the fatigue performance requirement of the entire blade 100 by adopting a smaller thickness. The thin airfoil type or the blade 100 with the relatively thin wall thickness can reduce the stall risk of a wind generating set to which the blade 100 is applied, improve the wind energy utilization rate and ensure the power generation benefit of the wind generating set.

As an alternative embodiment, the blade 100 provided by the embodiment of the present invention may have the length dimension H1 of the blade root 12 in the chord direction Y of the blade 100 equal to the length dimension H3 of the maximum chord length portion 13 in the chord direction Y, which is an alternative embodiment, and in some embodiments, the length dimension H1 of the blade root 12 in the chord direction Y may be less than or equal to 0.8 times the length dimension H3 of the maximum chord length portion 13 and greater than the length dimension H2 of the blade root 12 in the width direction Z of the blade body 10. Through the arrangement, the curved surface of the blade 100 from the maximum chord length part 13 to the blade root part 12 can be smoothly transited and more continuous, the connection between the blade 100 and the hub 200 is facilitated, and meanwhile, the fatigue performance of the whole blade 100 can be optimized.

As an alternative implementation, the blade 100 according to the embodiment of the present invention has the blade root 12 in an axisymmetric structure, and the symmetry axis of the blade root 12 extends along the chord direction Y. The blade root 12 is of an axisymmetric structure, which can ensure smooth and continuous transition of the curved surface of the blade 100 from the maximum chord length part 13 to the blade root 12. Meanwhile, when the blade 100 is used in a wind generating set, the borne load can be more uniformly transferred to the hub 200.

In some alternative embodiments, in the blade 100 provided by the present invention, the outer contour of the end surface of the blade root 12 facing away from the blade tip 11 in the axial direction X is an ellipse, the major axis direction of the ellipse coincides with the chord direction Y, and the minor axis direction coincides with the width direction Z. The outer contour of the end surface of the blade root 12, which is far away from the tip 11 in the axial direction X, is in an elliptical structural form, which is beneficial to the molding of the blade 100, and meanwhile, the transition curved surface of the blade 100 from the position of the maximum chord length part 13 to the position of the blade root 12 can be in smooth and continuous transition, so that the appearance of the transition section of the blade 100 can be adjusted more flexibly, the continuity and the structural performance of the appearance of the blade root 12 are improved, the weight of the blade 100 is reduced, and the frequency of the blade 100 is adjusted. In addition, the elliptical blade root 12 can also adjust the pitch center of the blade 100, and reduce the torque required by the pitch action.

In some alternative embodiments, the blade 100 provided in the embodiments of the present invention, in order to facilitate the connection with the hub 200, the blade root 12 is provided with a plurality of fixing holes 121, the plurality of fixing holes 121 are spaced along the shape of the outer contour of the end surface of the blade root 12 facing away from the tip portion 11 in the axial direction X, and each fixing hole 121 extends along the axial direction X of the blade body 10 by a predetermined length.

Since the blade body 10 involves the assembly of a plurality of first fastening members such as bolts, stress concentration caused by the fixing holes 121 provided at a plurality of positions needs to be carefully dealt with. In order to reduce the stress concentration of the blade body 10 at the position where the fixing hole 121 is provided, as an alternative embodiment, the blade 100 according to the embodiment of the present invention is provided, in which the wall thickness of the blade body 10 in the width direction Z is greater than the wall thickness of the blade body 10 in the chord direction Y. That is, by increasing the thickness of the blade 100 in the flapwise direction to resist deformation of the blade 100, the risk of stress concentration at the location of the fixing hole 121 is reduced. Optionally, the thickness of the blade body 10 in the width direction Z may be adjusted by increasing the number of layers of the fiber cloth in the flapping direction to increase the thickness of the layers, so that the operation is simple, and the fatigue performance requirement of the blade 100 can be ensured.

As an alternative implementation manner, the blade 100 according to the embodiment of the present invention has a blade root 12 that is a structural body with a uniform cross section in a predetermined length range along the axial direction X of the blade body 10. Since the first fastening member needs to be placed inside the fastening hole 121 on the root portion 12. By making the root portion 12 of the blade body 10 a constant-section structure in the axial direction X within a predetermined length range, the installation of the corresponding fastener can be facilitated. The length dimension of the constant cross-section structural body portion of the root portion 12 in the axial direction X may be set according to the length dimension of a fastener to be placed as long as it can satisfy the installation of the corresponding fastener and the connection with the blade body 10.

In some optional embodiments, the extended dimension h of the equal cross-section body of the blade root 12 may be any value between 1.5m and 2m, including two end values of 1.5m and 2m, which is beneficial to the installation of the fastener and can ensure the smooth transition requirement from the maximum chord length portion 13 to the blade root 12.

As an alternative embodiment, the width dimension H2 of the end face of the root portion 12 facing away from the tip 11 in the width direction Z is equal to the width dimension of the maximum chord length portion 13 to optimize the smoothness and continuity of the curved surface of the blade 100 from its maximum chord length portion 13 to the root portion 12.

As shown in fig. 5 to 7, as an alternative implementation, in order to facilitate connection between the blade 100 and the hub 200, the blade 100 according to the embodiment of the present invention further includes a transition assembly 20, the transition assembly 20 is disposed at one end of the blade body 10 in the axial direction X, the transition assembly 20 includes a first connection section 21 and a second connection section 22, the first connection section 21 matches with the shape of the blade root portion 12 and is connected to the blade root portion 12, and the second connection section 22 is disposed at a side of the first connection section 21 away from the blade body 10 and is used for being connected to the hub 200.

The blade 100 and the adapter assembly 20 provided by the embodiment of the invention can be connected with the blade body 10 through the first connecting section 21 and connected with the hub 200 through the second connecting section 22, and can play a role of connecting a bridge for the connection between the hub 200 and the blade body 10, so that the connection between the blade 100 and the hub 200 provided by the embodiment of the invention is satisfied without changing the structure of the existing hub 200. In addition, the adapter assembly 20 can share a part of the load borne by the hub 200, so that the structural design cost and the material consumption of the hub 200 can be properly reduced.

Optionally, the shape of the first connection section 21 and the shape of the root portion 12 mentioned in the embodiment of the present invention are matched, which means that the outer contour shape of the surface of the first connection section 21 facing the root portion 12 is consistent with the outer contour shape of the end surface of the root portion 12 facing away from the tip portion 11, so as to meet the butt joint of the first connection section 21 and the root portion 12.

Alternatively, in the blade 100 provided by the embodiment of the present invention, the outer contour shape of the end of the second connecting section 22 facing away from the first connecting section 21 may be identical to the shape of one of the inner ring and the outer ring of the pitch bearing on the hub 200 to be connected, and the blade is indirectly connected with the hub 200 through the pitch bearing. The attachment of the structurally improved blade 100 is satisfactory without changing the shape of the hub 200 or the pitch bearing on the hub 200.

As an alternative, when the blade 100 provided by the embodiment of the present invention has the outer contour of the end surface of the blade root 12 facing away from the tip 11 in the axial direction X being elliptical, the outer contour of the surface of the first connecting section 21 facing the blade root 12 may also be elliptical to facilitate the connection between the blade root 12 and the first connecting section 21.

In some optional embodiments, the blade 100 provided by the embodiments of the present invention may have the first connecting section 21 in the axial direction X as a uniform cross-section structure, and the first connecting section 21 adopts a uniform cross-section structure, which facilitates the formation of the first connecting section 21 and can also ensure the connection with the blade root 12.

Alternatively, when the outer contour of the end surface of the root portion 12 facing away from the tip portion 11 in the axial direction X is elliptical, the first connection section 21 may be elliptical disk-shaped as a whole. The outer contour shape of the cross section of the first connecting section 21 in the axial direction X may be elliptical.

As an alternative implementation manner, in order to facilitate the connection between the first connection section 21 and the blade root 12, in the blade 100 provided in the embodiment of the present invention, the first connection section 21 is provided with a plurality of first connection holes 211, the plurality of first connection holes 211 are distributed at intervals along the first circular trajectory aa, each first connection hole 211 is disposed through the first connection section 21 in the axial direction X, and the first fastening member 30 is disposed inside the first connection hole 211 to connect with the blade body 10.

The first circular track aa may be disposed according to the structural shape of the first connection segment 21, for example, when the outer contour shape of the cross section of the first connection segment 21 in the axial direction X is an ellipse, the first circular track aa may also be an ellipse, specifically, the first circular track aa is disposed according to the shape of the first connection segment 21, as long as the connection requirement between the first connection segment 21 and the blade root portion 12 can be satisfied.

According to the blade 100 provided by the embodiment of the invention, the first connection holes 211 are formed in the first connection section 21, so that the blade 100 can be connected with the blade root 12, and the switching requirement of the connection between the blade 100 and the hub 200 by the switching assembly 20 is further met.

Moreover, the first connecting section 21 and the blade root 12 of the blade body 10 can be connected by the first fastening member 30, so that the adapter assembly 20 can be detachably connected with the blade body 10, and when the adapter assembly 20 is damaged, the adapter assembly can be replaced without replacing the whole blade 100, thereby prolonging the service life of the blade 100.

Alternatively, the number of the first connection holes 211 on the first connection segment 21 may be the same as the number of the fixing holes 121 on the blade root 12, and the first fastening members 30 are connected between each of the first connection holes 211 and the fixing holes 121, so as to meet the connection requirement between the adaptor assembly 20 and the blade body 10.

As an alternative implementation, the vane 100 provided by the embodiment of the present invention has a circular outer contour of the end surface of the second connecting section 22 facing away from the first connecting section 21. Through the arrangement, one side end face of the second connecting section 22, which deviates from the first connecting section 21, can be matched with the shape of the connecting flange on the hub 200 or the inner ring or the outer ring of the pitch bearing connected with the hub 200, so that the connection between the adapter assembly 20 and the hub 200 is facilitated, and the connection requirement of the blade body 10 between the adapter assembly 20 and the hub 200 is further ensured.

As an alternative embodiment, the second connecting section 22 may be a structure with a uniform cross section in the axial direction X. Alternatively, the second connecting section 22 may have a disk-shaped structure as a whole, and the outer contour of the cross section of the second connecting section 22 may be circular in the axial direction X of the blade body 10. The connection with the hub 200 is facilitated, so that the blade 100 provided by the embodiment of the invention can be matched and connected with the hub 200 in a whole.

Optionally, a plurality of second connection holes 221 are disposed on the second connection section 22, the plurality of second connection holes 221 are distributed at intervals along the second annular trajectory bb, and each second connection hole 221 is disposed through the second connection section 22 in the axial direction X for connecting with the hub 200. Similarly, when the second connection section 22 is connected to the hub 200, the second connection section can be indirectly connected to the hub 200 through a pitch bearing, and the second fastening member 40 can be also disposed in the second connection hole 221 of the second connection section 22, so as to meet the requirement of indirect connection to the hub 200. Moreover, the second connecting section 22 is detachable from the hub 200, which facilitates transportation, disassembly and assembly of the blade 100 and the hub 200 and replacement requirements for the blade 100 or a pitch bearing arranged on the hub 200.

The second annular locus bb can be set according to the structural shape of the second connecting section 22, for example, when the outer contour shape of the cross section of the second connecting section 22 in the axial direction X is a circle, the first annular locus bb can also be a circle, specifically according to the shape of the second connecting section 22, as long as the connection requirement between the second connecting section 22 and the hub 200 can be satisfied.

As an alternative implementation manner, in the blade 100 provided in the embodiment of the present invention, the adapter assembly 20 is provided with a through hole 24, the through hole 24 penetrates through the adapter assembly 20 along the axial direction X, and correspondingly, an opening communicating with the inner cavity of the blade body 10 is provided on the blade root 12, so that cables inside the blade body 10, such as a ground wire, a conductive wire of a lightning structure, and the like, can be led out from the opening and the corresponding through hole 24 and connected with the outside.

In some optional embodiments, the blade 100 provided by the embodiments of the present invention may have a length dimension of an end surface of the first connection section 21 facing the blade root 12, which is greater than or equal to 1.2 times a length dimension of an end surface of the first connection section 21 facing away from the second connection section 22. Through the arrangement, the connection requirements between the adapter assembly 20 and the blade body 10 and between the adapter assembly and the hub 200 can be met, meanwhile, the load can be better transmitted, and the hub 200 is driven to rotate relative to the parts such as the engine room 400.

As an alternative implementation, the blade 100 according to the embodiment of the present invention is provided, wherein the first connecting section 21 has an axisymmetrical structure, and the symmetry axis of the first connecting section 21 extends along the chord direction Y of the blade body 10, and optionally, the symmetry axis of the first connecting section 21 may coincide with the axis of the blade root 12. Optionally, the second connecting section 22 is centered on the central axis of the first connecting section 21. Through the setting, can enough guarantee the connection demand between adapter module 20 and blade 10 and the wheel hub 200, can make better transmission to wheel hub 200 through adapter module 20 such as the gravity of blade 10, wind load simultaneously for adapter module 20 reduces its probability that bears the unbalance loading at the in-process of power or load transmission, improves the holistic life of blade 100.

In some alternative embodiments, as shown in fig. 8, the blade 100 of the present invention further includes a reinforcing member 23, and the reinforcing member 23 is connected between the first connecting section 21 and the second connecting section 22. By providing the reinforcing member 23, the strength of connection between the first connecting section 21 and the second connecting section 22 can be ensured, and the problem of stress concentration in the connecting area between the first connecting section 21 and the second connecting section 22 can be alleviated.

As an alternative embodiment, the reinforcing member 23 may include a plurality of reinforcing plates disposed around the second connecting section 22, each of which is connected to the first connecting section 21 and the second connecting section 22, respectively.

It is understood that the form of the reinforcing member 23 in the form of a plurality of reinforcing plates is only an alternative embodiment, and in some other examples, the reinforcing member 23 may also include a ring-shaped structure, and the reinforcing member 23 is disposed around the outer periphery of the second connecting section 22 and is connected to the first connecting section 21 and the second connecting section 22, respectively. With the above arrangement, the reinforcing effect on the joint of the first connection section 21 and the second connection section 22 can be satisfied.

Optionally, the reinforcing component 23 may be connected to the first connecting section 21 and the second connecting section 22 after being molded separately, and in some embodiments, the reinforcing component 23 may also be integrated with the first connecting section 21 and the second connecting section 22 to ensure the strength requirement of the whole adapter component.

As shown in fig. 8 and fig. 9, as an alternative implementation manner, in the blade 100 provided in the embodiment of the present invention, the cross-sectional area of the reinforcing member 23 may be gradually increased from the end surface of the second connecting section 22 away from the first connecting section 21 to the first connecting section 21, so as to effectively alleviate the problem of stress concentration in the connecting area between the first connecting section 21 and the second connecting section 22, and improve the overall structural safety of the adapter assembly 20.

In some optional embodiments, the vane 100 provided by the embodiments of the present invention may have a high strength, such as a high load capacity, due to the fact that the adapter assembly may be made of nodular cast iron.

It is understood that the above embodiments of the present invention are exemplified by the case where the outer contour of the end surface of the root portion 12 on the side away from the tip portion 11 in the axial direction X is elliptical, which is an alternative embodiment.

As shown in fig. 10, in some other examples, the outer contour of the end surface of the blade root 12 on the side away from the tip 11 in the axial direction X may be a waisted circle, two circular arc segments of the waisted circle are oppositely distributed in the chord direction Y, and two straight line segments are oppositely distributed in the width direction Z, as long as the curved surface of the blade 100 from the maximum chord length portion 13 to the blade root 12 can be smoothly transited and more continuously.

When the outer contour of the blade root 12 deviating from the end surface of one side of the blade tip 11 in the axial direction X is in a kidney-shaped shape, correspondingly, the first connecting section 21 may adopt a kidney-shaped structure matched with the shape of the end surface of one side of the blade tip 11 deviating from the blade root 12 in the axial direction X, so as to meet the requirement of connection between the first connecting section and the blade root 12.

According to the blade 100 provided by the embodiment of the invention, the blade body 10 is provided with the tip part 11, the blade root part 12 and the maximum chord length part 13 positioned between the tip part 11 and the blade root part 12 which are oppositely arranged in the self axial direction X, because the length dimension H1 of the blade root part 12 in the chord direction Y of the blade body 10 is greater than the length dimension H2 of the blade root part 12 in the width direction Z of the blade body 10 and is less than or equal to the length dimension H3 of the maximum chord length part 13 in the chord direction Y, and the width direction Z, the axial direction X and the chord direction Y are mutually perpendicular, the curved surface of the blade 100 from the maximum chord length part 13 to the blade root part 12 can be smoothly transited and is more continuous, so that the transition curved surface of the blade 100 in the area from the maximum chord length part 13 to the blade root part 12 can meet the fatigue performance requirement of the whole blade 100 by adopting a smaller thickness. Moreover, the transition curved surface has a smaller wall thickness, so that the stall risk of a wind generating set applied to the blade 100 can be reduced, the wind energy utilization rate is improved, and the power generation benefit of the wind generating set is ensured.

Because the wind generating set provided by the embodiment of the invention comprises the blade 100 provided by each embodiment, the curved surface of the blade 100 from the maximum chord length part 13 to the blade root part 12 can be smoothly transited and is more continuous, so that the transition curved surface of the blade 100 in the region from the maximum chord length part 13 to the blade root part 12 can meet the requirement of the fatigue performance of the whole blade 100 by adopting a smaller thickness. Moreover, the transition curved surface has a smaller wall thickness, so that the stall risk of a wind generating set applied to the blade 100 can be reduced, the wind energy utilization rate is improved, and the wind generating set has higher generating benefit.

While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims

1. A blade (100), comprising:

a blade body (10), wherein the blade body (10) has a blade tip (11), a blade root (12) and a maximum chord length (13) between the blade tip (11) and the blade root (12) which are arranged opposite to each other in the self-axial direction (X);

the length dimension of the blade root (12) in the chord direction (Y) of the blade body (10) is larger than the length dimension of the blade root (12) in the width direction (Z) of the blade body (10) and is smaller than or equal to the length dimension of the maximum chord length part (13) in the chord direction (Y), the width direction (Z), the axial direction (X) and the chord direction (Y) are mutually perpendicular, and the blade body (10) is in smooth curved surface transition from the maximum chord length part (13) to the blade root (12).

2. Blade (100) according to claim 1, characterized in that in the chord direction (Y) the length dimension of the root portion (12) is less than or equal to 0.8 times the length dimension of the maximum chord length portion (13);

and/or the length dimension of the end surface of the blade root (12) on the side facing away from the blade tip (11) in the width direction (Z) is equal to the length dimension of the maximum chord length part (13).

3. Blade (100) according to claim 1, wherein the blade root (12) is of an axisymmetric structure, the axis of symmetry of the blade root (12) extending in the chordwise direction (Y).

4. Blade (100) according to claim 3, wherein the outer contour of the blade root (12) in the axial direction (X) at the end face facing away from the blade tip (11) is elliptical, the major axis of the ellipse coinciding with the chord direction (Y) and the minor axis coinciding with the width direction (Z);

or the outer contour of the end surface of one side, deviating from the tip part (11), of the blade root part (12) in the axial direction (X) is in a waist circle shape, two arc sections of the waist circle shape are oppositely distributed in the chord direction (Y) and two straight line sections are oppositely distributed in the width direction (Z).

5. Blade (100) according to any of claims 1 to 4, wherein the blade (100) further comprises a transition assembly (20), wherein the transition assembly (20) is arranged at one end of the blade body (10) in the axial direction (X), wherein the transition assembly (20) comprises a first connection section (21) and a second connection section (22), wherein the first connection section (21) is matched with the shape of the blade root (12) and is connected to the blade root (12), and wherein the second connection section (22) is arranged at one side of the first connection section (21) facing away from the blade body (10) and is used for being connected with a hub (200).

6. Blade (100) according to claim 5, wherein in the chord direction (Y) the length dimension of the end surface of the first connection section (21) facing the root portion (12) is equal to or greater than 1.2 times the length dimension of the end surface of the first connection section (21) facing away from the second connection section (22).

7. Blade (100) according to claim 5, wherein the first connection section (21) is a constant cross-section structure in the axial direction (X), the first connection section (21) is provided with a plurality of first connection holes (211), the plurality of first connection holes (211) are distributed at intervals along a first annular trajectory (aa), each first connection hole (211) is arranged through the first connection section (21) in the axial direction (X), and a first fastening member (30) is arranged in the first connection hole (211) to connect with the blade body (10).

8. Blade (100) according to claim 5, wherein the outer contour of the end surface of the second connection section (22) on the side facing away from the first connection section (21) is circular, a plurality of second connection holes (221) are arranged in the second connection section (22), the plurality of second connection holes (221) are distributed at intervals along a second circular trajectory (bb), and each second connection hole (221) is arranged through the second connection section (22) in the axial direction (X) for connection with the hub (200).

9. Blade (100) according to claim 8, characterized in that said second connection section (22) is a constant section structure in said axial direction (X).

10. Blade (100) according to claim 5, characterized in that the adapter assembly (20) further comprises a reinforcement member (23), the reinforcement member (23) being connected between the first connection section (21) and the second connection section (22).

11. Blade (100) according to claim 10, characterized in that said reinforcing means (23) comprise a plurality of reinforcing plates arranged around said second connecting section (22), each of said reinforcing plates being connected to said first connecting section (21) and to said second connecting section (22), respectively;

alternatively, the reinforcing member (23) includes a ring-shaped structure, and the reinforcing member (23) is provided so as to surround the outer periphery of the second connecting section (22) and is connected to the first connecting section (21) and the second connecting section (22), respectively.

12. Blade (100) according to claim 10, wherein the cross-sectional area of the reinforcement part (23) increases gradually from the end face of the second connection section (22) facing away from the first connection section (21) to the first connection section (21).

13. Blade (100) according to any of claims 1 to 4, characterized in that the wall thickness of the blade body (10) in the width direction (Z) is larger than the wall thickness of the blade body (10) in the chord direction (Y).

14. A wind turbine generator set, comprising:

a hub (200);

blade (100) according to any of claims 1 to 13, connected to the hub (200).