Hub for a rotor of a wind turbine

Abstract

This disclosure relates to a hub (1) for a rotor of a wind turbine, the hub including a hub body (2) including a first flange (4) and at least one second flange (5) configured to support rotor blades, the at least one second flange defining a second flange region (6) of the hub body. The hub also includes a reinforcing element (7) extending within at least a portion of the second flange region, wherein the thickness of the reinforcing element in a direction perpendicular to the extension is constant at least within a defined range.

Description

Technical Field

[0001] This disclosure relates to wind turbines, rotors for wind turbines, and more specifically, hubs for rotors of wind turbines. Background Technology

[0002] In existing technological solutions, wind turbines include a hub for supporting rotor blades.

[0003] The hub of a wind turbine is supported by a shaft (rotor shaft), which is typically housed inside the nacelle and arranged to connect the hub, which carries the blades, to the wind turbine's tower. To support one or more blades, the hub has one or more flanges, commonly referred to as "blade connecting flanges." Between the blade connecting flanges of the hub and the blade sections, blade bearings that allow each blade to rotate relative to the hub are connected by bolts or other means.

[0004] Under the influence of aerodynamic loads, the hub can rotate together with the blades around the axis of rotation, thereby providing mechanical output at the shaft.

[0005] The hubs that support the blades and the bearings of long rotor blades are subjected to high-intensity loads, for example, at and around the flange region of the hub. These loads include, but are not limited to, axial loads, radial loads, and bending loads. Therefore, it is crucial that the hubs be robust enough to withstand these loads, minimizing deformation / deflection as much as possible and mitigating other inherent effects such as ellipticization.

[0006] Therefore, the objective of this disclosure is to provide a solution that strengthens the flange and improves the load distribution on the hub in a beneficial manner, compared to known prior art solutions.

[0007] In particular, it should contribute to the manufacture of the hub. Summary of the Invention

[0008] This disclosure relates to a wind turbine, a rotor of a wind turbine, and a hub for a rotor of a wind turbine.

[0009] The hub may be part of a rotor according to the present disclosure, and the rotor may be part of a wind turbine according to the present disclosure.

[0010] The hub according to the present invention includes at least a hub body. The hub body may be a basic structural part of the hub.

[0011] The hub body according to this disclosure includes at least a first flange and a second flange. The hub also includes a reinforcing element, which may be an integral part of the hub body or a separate part fixed to the hub body by a fastening device.

[0012] The first flange is preferably configured to attach the hub body to the rotor shaft of the wind turbine. Here, the rotor shaft is configured to connect the hub and blades constituting the rotor to the nacelle and tower of the wind turbine.

[0013] The second flange is preferably configured to support the rotor blades. In other words, one or more rotor blades of the wind turbine are preferably attached to the hub body via one or more second flanges in a movable manner.

[0014] In one embodiment, the hub body includes three second flanges configured to each support a rotor blade, such that a total of three rotor blades are carried by the hub body. Alternatively, the hub body may also include one or more third flanges for supporting the rotor blades, the third flanges being different from the second flanges.

[0015] According to this disclosure, at least one second flange (or each of a plurality of second flanges) defines a second flange region of the hub body. According to embodiments, the second flange region is an internal circumferential region closed, surrounded, or defined by the second flange. For example, if the second flange is circular, the second flange region can be characterized by the inner diameter dimension of the second flange, or if the second flange is generally circular or non-circular, it can be characterized by any other characteristic dimension.

[0016] For example, the first flange and the second flange are manufactured integrally with the hub body.

[0017] The reinforcing element extends within at least a portion of the second flange region. In other words, the reinforcing element extends in one or more directions to abut the hub body, with the extension partially or completely within the second flange region.

[0018] According to an embodiment, a portion of the joint of the reinforcing element may be adjacent to the second flange region, while the remainder of the joint is adjacent to the hub body excluding the second flange region.

[0019] According to some embodiments, the reinforcing element abuts the hub body at at least two joints. In other words, the reinforcing element may originate from or begin at two or more points on the hub body and extend in one or more directions within the second flange region. The area where the reinforcing element intersects with the hub body (housing) constitutes a "joint".

[0020] According to the implementation method, when the reinforcing element is cast together with the hub, the joint can be inherently formed.

[0021] According to another embodiment, the joint can be one of the following: a metallurgical joint, such as a welded joint; or a mechanical joint, such as a riveted joint or a bolted joint; or a geometrically defined joint, such as a dovetail joint or a snap-fit ​​joint.

[0022] At least two joints can be selected from the same or different types of joints. There can be more than two joints, such as three joints, four joints, five joints, or more than five joints.

[0023] According to some embodiments of this disclosure, the thickness of the reinforcing element is constant, at least within a defined range. For example, a side view or cross-sectional side view depicting the entire extent of the reinforcing element within the second flange region, indicated by XX, shows that the thickness of the reinforcing element is constant within a defined range. The cross-sectional plane required to achieve the cross-sectional side view along XX can be considered at the central portion or at one or more edges. In either case, a constant thickness, at least within a defined range, can be achieved.

[0024] According to some implementations, a "defined range"—or simply "range"—can be at least one principal direction along which the reinforcing element extends or substantially along which it extends. For example, the range may be linear with respect to a reference direction, such as a (longitudinal) direction that is the axis of rotation, or it may be non-linear, such as being circular or elliptical within the blade flange region. In the case of a circular range, the circumferential direction of the second flange region may be used as the reference direction.

[0025] In other embodiments, "range" can refer to the direction of extension of the reinforcing element, in which the reinforcing element has a significantly larger dimension compared to the dimensions in the other directions. For example, if the reinforcing element is a rod or beam, the range is defined along a length direction, the dimension of which is significantly larger than the dimensions in the other two directions—i.e., the width and the height / depth. In the case of a circular reinforcing element, such as a ring, the range can be a circumferential length whose dimension is significantly greater than the width and height / depth.

[0026] According to some implementations, the thickness can be defined in a direction perpendicular to the extent of the reinforcing element. For example, the extent can be the length direction of the reinforcing element. When the reinforcing element is viewed in cross-section or from the side, the thickness direction of the reinforcing element extends orthogonally to the extent of the reinforcing element, and can therefore be understood as the height or depth of the reinforcing element.

[0027] The reinforcing element can be constructed as a reinforcing web, for example, as a rod, beam, plate, tube, or element of any different type with any geometry.

[0028] A reinforcing element with a constant thickness advantageously possesses high stiffness and high mechanical stability. Furthermore, the casting, demolding, and manufacturing processes associated with the reinforcing element according to this disclosure are advantageously facilitated.

[0029] The reinforcing element can be cast integrally with the hub, or it can be manufactured separately and attached to the hub later.

[0030] Furthermore, the reinforcing element extends in multiple directions between at least two engagements with the hub body, including the length direction. Additionally, the reinforcing element extends in a width direction perpendicular to the respective extension direction, such as the length direction, between two other points within the second flange region. And the reinforcing element extends in a thickness direction perpendicular to both the length and width directions, and therefore also perpendicular to the main region surrounded by the second flange region.

[0031] The reinforcing element has symmetrical features; for example, the reinforcing element is designed as a symmetrical web. Such a web may have at least one symmetrical surface, wherein the symmetrical surface is defined or referenced relative to the axis of rotation, and wherein the thickness direction of the reinforcing element extends orthogonally to the symmetrical surface in a direction toward the axis of rotation.

[0032] According to the embodiment, the reinforcing element has a geometry selected from the following: a rectangular shape—such as a cuboid or prism shape; an X-shaped shape—in which one or more beams or arms form an X-shaped structure; a Y-shaped shape—in which one of the arms or webs is inclined relative to at least one other web to form a Y-shaped shape; a circular or non-circular arcuate shape—in which one or more beams form a circular structure similar to an annular or ring-shaped member or form an elliptical shape, a parabolic shape, a hyperbolic shape, and any combination thereof.

[0033] According to one embodiment, the reinforcing element can be designed as a completely solid part or a hollow part or a combination of both, wherein the solid part has certain hollow features, such as hollow cavities or hollow recesses.

[0034] In one embodiment, the reinforcing element may have at least one non-planar feature, such as an arcuate edge or an arcuate upper surface.

[0035] The geometry mentioned can be the primary geometry of the reinforcing element. The reinforcing element may also include additional segments that deviate from the primary geometry.

[0036] The geometry is symmetrical, which enhances stability and facilitates manufacturing.

[0037] According to an embodiment, the reinforcing element extends along a length direction, wherein the length direction can be defined as the extension direction of the rotation axis of the rotor shaft or referencing the extension direction of the rotation axis of the rotor shaft, or generally along the rotation axis of the rotor shaft. The axis of the rotor shaft is the same as the rotation axis of the hub itself, therefore the terms "hub axis," "rotation axis," or simply "shaft axis" can be used interchangeably in the description.

[0038] In some embodiments, the length direction can be defined as the direction of extension between the first flange and the front end of the hub body opposite to the first flange. In other words, the length direction means the direction of extension along or approximately along the axis of rotation.

[0039] The reference to the axis of rotation above applies when viewing the wind turbine from above. When viewed from the side, the reinforcing element may be tilted relative to the axis of rotation.

[0040] In other embodiments, when viewed from the side or top, the length direction can be defined or referenced as the longitudinal direction extending from the rotor to the rear end of the nacelle.

[0041] This arrangement provides optimal mechanical stability.

[0042] In the case of a rounded or circular geometry, at least a portion of the reinforcing element may extend along the direction of extension of the axis (length direction). For example, if the main direction or extent of the reinforcing element is circular, i.e., the extension is along and concentric with the periphery of the second flange, then the width component of the reinforcing element may extend at least along the length direction.

[0043] According to an embodiment, the reinforcing element includes one, two or more segments spanning the length direction, such that the thickness of each segment is constant along the length direction.

[0044] This can help to effectively cast the reinforcing elements and hub into one piece, while providing different mechanical / structural properties corresponding to different sections.

[0045] This has the advantage of increasing design freedom.

[0046] According to one particular implementation, a single segment may include the entire reinforcing element.

[0047] According to an embodiment, the reinforcing element includes at least two segments, and the intersection of any two adjacent segments of the two or more segments includes a transition portion.

[0048] The transition section can be constructed as a stepped section, a tapered section, or a rounded corner (rounded corner, elliptical rounded corner, etc.), or a repeating geometric pattern, such as a wavy section, a groove, etc.

[0049] A well-shaped transition section can advantageously support or facilitate load distribution in reinforcing elements.

[0050] According to an embodiment, at least one of the joints includes a recessed portion that is advantageously configured to accommodate at least a portion of a bolt for receiving a rotor blade or rotor blade bearing.

[0051] The recessed portion is a local surface area of ​​the joint, the height of which is lower than or slightly lower than the height of the surrounding surface of the joint, or lower than the upper surface area of ​​the reinforcing element itself away from the joint.

[0052] Rounded corners or curved recesses are examples of recessed sections.

[0053] The recessed portion allows the operator to easily place and manipulate tools, machines, etc., used for operations such as tightening or loosening rotor blade bolts.

[0054] Therefore, the bearings of the rotor blades, and thus the blades themselves, can be arranged in precisely specified positions.

[0055] By arranging the bearings accordingly, the load distribution can be improved, and the hub design can be chosen in a more varied and flexible manner.

[0056] According to an embodiment, the cross-section of the reinforcing element includes a central portion having a constant thickness along the width direction and at least one edge portion configured to have a variable thickness along the width direction, the width direction being perpendicular to the corresponding extension direction (range) of the reinforcing element. As previously stated, the thickness is a dimension of the reinforcing element perpendicular to both the extension direction (range) and the width direction.

[0057] The cross section is a cross section of the reinforcing element perpendicular to the defined area, and the cross section diagram of the reinforcing element depicts the width and thickness of the reinforcing element.

[0058] Different specific implementations are possible. For example, the reinforcing element may have a constant thickness in the central portion, but may have a variable thickness in the edge portion, such as having a tapered or rounded structure, wherein the thickness of the edge portion may be narrower or wider.

[0059] Depending on the implementation, one or more edges in the edge portion may be tapered, stepped, arc-shaped, grooved, corrugated, or rounded.

[0060] The reinforcing element may also include two or more edge portions adjacent to the central portion from different sides.

[0061] The described structure with edge portions of variable thickness can help reinforce the components for easier demolding during manufacturing.

[0062] According to one embodiment, the reinforcing element includes at least two provisions for supporting a pitch actuator used to pitch the rotor blades.

[0063] The mounting device can be constructed as a recess or hole, which can be shown as a flange structure or similar to a bracket.

[0064] A pitch actuator is an actuator used to drive and set the pitch angle of rotor blades.

[0065] Advantageously, apart from the reinforcing elements, no other support structures are needed for the pitch actuator.

[0066] According to one embodiment, the rotor shaft defines a rotation axis (optionally referred to as the shaft axis), and at least two mounting devices for supporting the pitch actuator are arranged symmetrically with respect to the rotation axis.

[0067] Therefore, the pitch actuator can be installed on either side of the rotation axis.

[0068] If the pitch actuator malfunctions or exhibits failure, such as damaging the meshing elements of the slewing bearing, the pitch actuator can be removed from the mounting and attached to another mounting that will not damage the slewing bearing teeth. Due to symmetry, the distance (linear or angular distance) between each pitch actuator and the axis of rotation remains constant.

[0069] According to one embodiment, in addition to or in lieu of the previous embodiment, the pitch actuator is arranged asymmetrically relative to an axis perpendicular to the axis of rotation.

[0070] More specifically, the axis is perpendicular to the axis of rotation, relative to the axis within the main region of the second flange as defined above.

[0071] In other embodiments, the axis perpendicular to the axis of rotation may refer to a direction parallel to the width direction of the cabin.

[0072] According to an embodiment, the reinforcing element has an X-shaped shape as described above, and the reinforcing element includes a pair of first arms adjacent to the hub body near the first flange and a pair of second arms adjacent to the hub body near the front end opposite to the first flange.

[0073] In this way, the arm of the X-shaped reinforcing element can not be completely adjacent to the hub body along the axis, but is offset at an angle relative to the axis. This results in the stiffness range along the length direction, radial direction, and circumferential direction of the hub body, especially the second flange.

[0074] Furthermore, the X-shaped shape is particularly advantageous because an access opening is formed between the arms of the X-shaped reinforcing element, thereby allowing access to the rotor blades from the hub.

[0075] In addition, a central opening or orifice may be provided in the central part between the arms or in the intersection of two pairs of arms.

[0076] According to an embodiment, a pair of first arms of the X-shaped reinforcing element define a first angle between the pair of first arms, and a pair of second arms define a second angle between the pair of second arms, wherein the second angle is preferably different from the first angle.

[0077] According to an embodiment, at least one of the pair of first arms has a width and / or thickness different from at least one of the pair of second arms. The width direction is generally orthogonal to the defined range (extension direction) and the previously defined thickness (height / depth).

[0078] According to the embodiment, the periphery of the second flange region and any two adjacent arms of a pair of first arms and a pair of second arms define an opening, such as an access opening.

[0079] An opening may be required to access the interior of the rotor blades or the corresponding blade bearings via the second flange area.

[0080] Therefore, four (entry) openings are provided between the four different arms of the X-shaped reinforcing element. One opening is provided between each pair of adjacent arms, wherein "adjacent" specifically means "adjacent in the circumferential direction of the second flange region or along the circumferential direction of the second flange region".

[0081] In addition, according to other embodiments and as mentioned above, additional openings may be provided at the intersection area between a pair of first arms and a pair of second arms.

[0082] The opening can be configured as, for example, a central rectangular or circular cutout, which allows access to the pitch control console associated with the pitch actuator for installation, repair, inspection, and / or replacement.

[0083] According to the implementation, the reinforcing element includes a ring element (as an alternative to an X-shaped element).

[0084] According to the implementation, the ring element may have a geometry selected from one or more of circles and ellipses.

[0085] According to a specific embodiment, a plurality of recesses are provided between the annular element and the periphery of the second flange.

[0086] Each recess is separated from the adjacent recess by a joint constructed between the reinforcing element, particularly the annular element, and the second flange.

[0087] Each recess may have a radial range and a circumferential range, and according to an embodiment, at least one recess has a relatively small radial range and a relatively large circumferential range.

[0088] For each recess, the circumferential and / or radial extents can be different and can be distributed asymmetrically along the circumference of the annular element, such as a ring.

[0089] According to a specific embodiment, the circumferential range of at least one recess is greater than the radial range, and the ratio is preferably at least 3, more preferably at least 5, more preferably at least 7 to 10, and most preferably at least 12.

[0090] These recesses serve as entry openings as described above.

[0091] The purpose of the entry opening may be to access the bolts or bolt sets used to attach the blade or blade bearing to the second flange. Due to the multiple recesses with defined entry ratios, a particular bolt set does not need to be aligned with a particular set of recesses.

[0092] In the case of X-shaped reinforcing elements or ring-shaped elements, the casting can be integrally constructed with the hub during manufacturing, or the element can be cast separately during manufacturing and attached to the hub later.

[0093] Furthermore, since the mounting device for supporting the pitch actuator is foreseeable, the additional pitch actuator support flange (or bracket) can be omitted.

[0094] The annular shape advantageously provides additional surface area for the movement of service personnel, equipment, tools, machines, etc., and for access to the entire circumferential area of ​​the reinforcing element.

[0095] According to an embodiment, the reinforcing element includes a first web and at least one second web, wherein the at least one second web is inclined relative to the extension direction of the rotor shaft and / or the first web.

[0096] According to an embodiment, at least one second web has a width and / or thickness different from that of the first web. Attached Figure Description

[0097] The disclosure is illustrated below with figures and examples.

[0098] This disclosure is not limited to the examples shown.

[0099] These diagrams illustrate the following:

[0100] Figure 1: A schematic diagram of a wind turbine according to an exemplary embodiment.

[0101] Figure 2 : A perspective view of a cross-section of a hub including substantially linear reinforcing elements, particularly rectangular reinforcing elements, according to the first embodiment.

[0102] Figure 3 According to schematic diagrams of different cross-sections of the reinforcing elements in the second embodiment, each of these reinforcing elements includes a central portion with a constant thickness and an edge portion with a variable thickness.

[0103] Figure 4 : Schematic diagrams of different longitudinal profiles and corresponding cross sections of reinforcing elements according to some implementation methods.

[0104] Figure 5 : A perspective view of a hub including an exemplary X-shaped reinforcing element according to a third embodiment.

[0105] Figure 6 : A perspective view of a hub including an exemplary annular reinforcing element according to the fourth embodiment.

[0106] Figure 7 and Figure 8 : A perspective view of a hub including a Y-shaped reinforcing element according to an exemplary embodiment.

[0107] Figure 9 The illustration shows a schematic cross-sectional view of the joint between a reinforcing element and a hub body according to an exemplary embodiment. The joint area includes a recessed portion configured to accommodate a portion of a bolt for receiving a rotor blade. Detailed Implementation

[0108] Figure 1 A wind turbine 100 including a tower 20 is shown. The tower 20 is fixed to the ground by means of a base 104. A nacelle 40 is rotatably mounted at one end of the tower 20 opposite to the ground. The nacelle 40 includes, for example, a generator (not shown), which is coupled to a rotor 110 via a gearbox (not shown). The rotor 110 includes three (wind turbine) rotor blades 101, 102, and 103 arranged on a rotor hub 112, which is connected to a rotor shaft (not shown).

[0109] During operation, rotor 110 is configured to rotate by airflow, such as wind, which interacts with blades 101, 102, and 103 to generate forces acting on the blades 101, 102, and 103. This rotational motion is transmitted to a generator via a drive system, which specifically includes a rotor shaft and a gearbox. The generator converts the mechanical energy of rotor 110 into electrical energy.

[0110] The nacelle 40 must rotate into the wind to optimize the energy output of the wind turbine 100. This is achieved through a yaw system (not shown). Furthermore, the pitch angles of the rotor blades 101, 102, and 103 must be adjusted according to wind speed and other conditions to optimize rotor performance and maintain the turbine's energy output at a desired level. For control and operation of multiple systems, the wind turbine includes a main controller 30 (turbine controller) and an optional auxiliary control unit 31 disposed within the nacelle 40 and communicatively connected to the main controller 30.

[0111] Figure 2 A first embodiment of the reinforcing element 7 is shown.

[0112] The figure shows a hub 1, which includes a hub body 2, which is substantially shaped as, for example, a hollow circular body. The hub body 2 can also be referred to as the housing of the hub.

[0113] The hub body 2 has a first flange or a shaft flange 3, which can be connected to the shaft of the wind turbine, so that the shaft connects the hub 1 or the hub body 2 to the nacelle of the wind turbine.

[0114] The hub body 2 has a front end portion 4 opposite to the side of the shaft flange 3. Throughout the description, the shaft flange or the first flange 3 may be interchangeably referred to as the rear end portion 3 of the hub body 2.

[0115] The axis of rotation SS—also known as the axis of rotation of the shaft or hub—can extend from the rear end 3 of the hub body 2 to the front end 4.

[0116] In addition, around the circumference of the hub 1, one or more second flanges (or blade flanges) 5 are provided between the front end 4 and the rear end 3.

[0117] In the example, three second flanges 5 are illustrated, arranged regularly around the circumference of hub 1.

[0118] Here, "regularly" means that these second flanges are arranged symmetrically with a uniform distance between each second flange in the second flange 5 along the circumference or about the axis of rotation SS. For example, if there are three second flanges corresponding to three rotor blades, the angular distance between two adjacent flanges is exactly 120 degrees.

[0119] Each flange can have a circular shape.

[0120] According to the implementation, the flange is a ring or a ring-like shape.

[0121] The blade flange 5 supports the rotor blades via blade bearings. The blade bearings facilitate the rotation or pitch of each blade about the central axis of the corresponding second flange.

[0122] The bearings of the blades are usually arranged and fixed to the blade flange 5 by bolts.

[0123] Therefore, the load acting on the blade is transferred to the second flange 5, and then to the hub 1.

[0124] The flange region 6 of the second flange 5 is an inner circumferential region defined, surrounded, or enclosed by the second flange 5. The flange region 6 may define two opposing points, such as two diameter-opposite points, that face each other along the flange region 6.

[0125] To improve load distribution, the reinforcing element 7 is arranged in one or more of the second flanges 5, between two opposite points in the flange region 6, such as... Figure 2 As shown.

[0126] At these two opposite points, the reinforcing element 7 is securely abutted against the second flange 5 via the joint 8.

[0127] In the example of the first embodiment, the reinforcing element 7 on the top of the hub 1 is constructed as a substantially rectangular beam or web that extends along the length direction of the axis of rotation SS, meaning it extends from the front end 4 to the rear end 3.

[0128] When viewed from the side, it can be seen that the plane of the reinforcing element 7 does not extend completely parallel to the axis SS, but rather extends at an angle to the axis. This inclination may be due to the tapered angle of the second flange 5 relative to the axis SS. However, when viewed from the top... Figure 2 At that time, it can be seen that the reinforcing element 7 extends along the axis SS.

[0129] In an alternative embodiment, when viewed from above, the reinforcing element 7 may extend obliquely relative to the axis SS, for example, at a 90-degree angle relative to the axis SS.

[0130] Furthermore, the reinforcing element 7 of the first embodiment may have a continuous single segment, or as shown, have three segments 7a, 7b and 7c, wherein the thickness of the reinforcing element 7 is constant for each segment.

[0131] In the illustrated embodiment, the outer segments 7a and 7c are of the same thickness and are thicker than the inner segment 7b. This configuration can enhance the stiffness of the reinforcing element 7, particularly the stiffness of the reinforcing element 7 at joints where stress is often high. The reduced thickness at the center may also be beneficial in terms of material, weight, and cost reduction.

[0132] A transition portion 9 is anticipated between segments 7a, 7b, and 7c. The transition portion 9 can be constructed as a rounded corner, a tapered section, or a stepped section. The rounded corner can be concave or convex in nature and can have a rounded, elliptical, or any other arcuate geometry.

[0133] The transition portion 9 may be the same or different within each segment or between different segments. For example, a single transition portion may be characterized by a stepped portion on one side, such as at the top, and a tapered portion on the other side, such as at the bottom.

[0134] According to an embodiment, the hub body 2 includes a pitch actuator support flange (or bracket) 10, which is arranged at the second flange 5 to support the pitch actuator used to set the pitch of the rotor blades.

[0135] According to another embodiment, the reinforcing element 7 may be provided with one or more mounting devices, such as orifices or openings (not in the...) for supporting the pitch actuator. Figure 2 (as shown in the figure) to replace a separate flange 10 or bracket 10.

[0136] In other embodiments described below ( Figures 5 to 8 In the original text, the pitch actuator support flange (or bracket) 10 can be omitted.

[0137] exist Figure 3 The image shows side views and cross-sectional views of different types of reinforcing elements 7—particularly concerning different edge geometries. On the left, the reinforcing element 7 is shown from the side, and on the right, cross-sectional views taken along the corresponding sections (AA, BB, CC, DD, EE) of the side view are shown.

[0138] In all cross-sections, except in the length direction, the central portion 11a or approximately the central portion of the reinforcing element 7 has a constant thickness along the width direction, as defined in the general section herein, while the edge portions 11b, 11c, and 11d may, for example, have variable thickness along the width direction. For example, 11b to 11d depict tapered edges, and 11e depicts rounded or curved edges.

[0139] In addition, return to reference Figure 2 As indicated by XX, a side view or cross-sectional side view depicting the entire extent of the reinforcing element 7 within the second flange region 6 shows that the thickness of the reinforcing element is constant within a defined range. Figure 2 In the example shown, the defined range is the length direction with reference to the extension direction of the rotation axis.

[0140] The cross-sectional plane required to realize the cross-sectional side view (denoted by XX) can be considered or obtained at the central portion 11a or at one or more edge portions 11b to 11e. In either case, when the view is along the cross-section XX, the cross-section exhibits a constant thickness at least within a defined range.

[0141] Furthermore, if there are two or more segments 7a, 7b, 7c along the defined range, the cross-sectional view along XX shows that each of the segments 7a, 7b, 7c has a constant thickness along its corresponding range.

[0142] According to the implementation method, the central portion 11a may be hollow (see [link]). Figure 3 (EE). For example, if the central portion 11a is rectangular, it may include a hollow rectangular (or any other geometrically shaped) recess extending along the defined range, wherein the recess is surrounded / defined by the remainder of the reinforcing element's material.

[0143] The same applies to other cross-sectional geometries (e.g., a square with rounded corners), where the hollow portion may be geometrically similar to or inconsistent with the outer cross-sectional geometry. A non-limiting example is a reinforcing element with an outer geometry of a "square with rounded corners" and an inner circular hollow portion.

[0144] According to the implementation method, such as Figure 2 The end segments 7a and 7c shown may be hollow (with recesses), and the central segment 7b may be solid.

[0145] According to Figure 3 In the referenced embodiments, the reinforcing element 7 may have tapered, rounded, stepped, arc-shaped, grooved, notched, recessed, or corrugated geometries in the edge portions 11b, 11c, 11d, 11e, thereby making the thickness of the edge portions non-uniform, i.e., narrowing or widening or undergoing a fluctuating transition as it progresses toward the edge. In other words, the edge portions widen toward the central portion (or narrow according to some embodiments), and then the central portion remains constant in width along a given distance.

[0146] According to the embodiments, the edge portion can be manufactured to include notches or recesses.

[0147] According to the implementation method, the recess, notch, corrugated portion, or groove can be reinforced by appropriate means.

[0148] According to the embodiments, the central portion and at least one edge portion may have different material properties and / or different mechanical properties and / or different structural properties.

[0149] also, Figure 4 The illustrations show different configurations of the reinforcing element 7, particularly the joint 8 or the portion of the joint 8 that connects the reinforcing element 7 to the hub body 2. Figure 4 The left-hand side of the figure shows a side view of the reinforcing element at the end of the joint 8, while the right-hand side shows a corresponding front or rear view of the cross-section of the joint 8. As can be seen in the figures, the thickness of the reinforcing element is constant along the length of the reinforcing element 7, at least within a defined range. However, the joint 8 can have various cross-sectional shapes, such as a rectangular cross-section, a tresca cross-section, a stepped cross-section, etc.

[0150] The different geometries of the joint 8 are designed to improve the stiffness and mechanical stability of the reinforcing element 7 and the hub body 2 as a whole.

[0151] In this embodiment, the cross-sectional shape of the joint 8 is asymmetrical about the horizontal and / or vertical planes.

[0152] For optimal load distribution, a symmetrical cross section can be used, preferably a cross section with several axes of symmetry, such as a rectangular, cross-shaped, X-shaped, or Tresca-shaped cross section.

[0153] In other Figures 5 to 8 The document shows other embodiments that are substantially similar to the first embodiment.

[0154] For all embodiments, hub 1 and hub body 2 can be the same, but the sameness should not be considered a limitation, because the reinforcing element of this embodiment can be used for any type of hub.

[0155] However, the geometry of the reinforcing element 7 is different for each implementation.

[0156] All of the following embodiments have an advantageous reinforcing element 7, which has an integrated mounting device 12 for arranging the pitch actuator. Therefore, in all of the following embodiments, the pitch actuator support flange (or bracket) can be omitted.

[0157] exist Figure 5 In the middle, the reinforcing element 7 is constructed to have an X-shaped form.

[0158] The x-shaped reinforcing element 7 extends along the length direction, which can extend from the front end 4 of the hub 1 along the extension direction of the rotation axis SS to the rear end 3.

[0159] According to one embodiment, the X-shaped reinforcing element 7 includes four arms 13, for example, these arms 13 are classified into a pair of first arms 13a near the first flange 3 and a pair of second arms 13b near the front end portion 4. An opening 14 is provided between each pair of arms for accessing the blade from the hub body 2 through the flange 5.

[0160] In addition, an additional opening 15 is recessed in the center of the X-shape for additional access.

[0161] The aperture 15 can be oval, circular, rectangular, or any other shape. The aperture 15 can allow access to certain electrical components associated with the pitch system, such as the pitch box or pitch cabinet.

[0162] The mounting device 12 for arranging the pitch actuator is arranged symmetrically about the axis SS in the two arms of the x-shaped reinforcing element 7, for example in the second arm 13b.

[0163] According to some embodiments, a pair of first arms 13a define a first angle between them, and a pair of second arms 13b define a second angle between them, such that the second angle is different from the first angle.

[0164] The angle between the second arm portions 13b, i.e. the second angle, can achieve sufficient (circumferential) separation between the mounting devices 12 used to support the pitch actuator, so that any malfunction that occurs when the pitch actuator is positioned in one of the mounting devices 12 can be remedied by transferring the pitch actuator to the other mounting device 12.

[0165] Furthermore, the different first and second angles between the pair of first arms 13a and the pair of second arms 13b allow for optimization of load distribution or stiffness, while providing other benefits such as a higher strength-to-weight ratio and material optimization. This reinforcing element 7 also results in asymmetry along the axis PP perpendicular to the axis SS.

[0166] According to an embodiment, an X-shaped or other form of reinforcing element 7 may form a joint 8 in the region where the second flange 5 abuts the adjacent body (or housing) of the hub 1. In this case, a portion of the thickness of the reinforcing element 7 may abut the second flange 5, while the remaining thickness abuts the hub body (or housing).

[0167] In embodiments, the joint 8 of the X-shaped or other form of reinforcing element 7 may have the same or different thickness compared to the reinforcing element 7. For example, the joint 8 may have a greater thickness than the reinforcing element 7, such as at least 1.2 times, or 1.4 times, or 1.5 times, or 2 times or more.

[0168] In another embodiment, the joint 8 of the X-shaped or other form of reinforcing element 7, which can be characterized by rounded corners or any other contour, may have a variable width as it terminates at the hub body 2, while having a constant thickness (or depth).

[0169] In an embodiment, the X-shaped reinforcing element 7 can be designed such that a pair of first arms 13a can have a first thickness and a pair of second arms 13b can have a second thickness, wherein the first thickness is different from the second thickness.

[0170] In another embodiment, the X-shaped reinforcing element 7 may be designed such that each of the four arms 13 constituting a pair of first arms 13a and a pair of second arms 13b has a different thickness and / or width compared to the other three arms.

[0171] In one embodiment, the X-shaped reinforcing element 7 may be designed such that at least a portion of the common edge extending along the first arm 13 and the corresponding second arm 13 has a curved profile.

[0172] In an embodiment, the X-shaped reinforcing element 7 can be designed such that the extending planes of a pair of first arms 13a are different from the extending planes of the second arms 13b. In other words, a pair of first arms 13a can constitute one segment of the reinforcing element, while a pair of second arms 13b can constitute another segment of the reinforcing element 7, as previously referred to. Figure 2 Explanation.

[0173] Alternatively, the extension planes of the first arm 13a and the second arm 13b on one side (left or right) of the axis SS may be different from the extension planes of the first arm 13 and the second arm 13 on the other side (right or left) of the axis SS.

[0174] Figure 6 The illustration shows an embodiment in which the reinforcing element 7 is constructed as a ring element 7p, such as a ring-shaped element or an elliptical element.

[0175] The annular element 7p extends relative to the entire circumference of the flange 5, and two or more joints 8 can be formed along the circumference of the flange 5.

[0176] A recess 16 may be formed between the periphery (inner circumference) 6a of the second flange 5 and the reinforcing element 7.

[0177] According to an embodiment, the recess 16 may allow at least a portion of a plurality of bolts (not shown) of the blade root end section to extend through these recesses 16.

[0178] Between adjacent recesses 16, a connecting segment 17 for connecting the annular element 7p to the second flange 5 can be anticipated to create a joint 8. In the illustrated example, five connecting segments 17 are arranged regularly. Different numbers of connecting segments are also feasible.

[0179] According to the embodiment, the joint section 17 and the recess 16 are arranged symmetrically with respect to the axis.

[0180] In one embodiment, the annular element 7p may include a substantially radially extending cut (not shown) such that the reinforcing element 7 can form an open ring (similar to a C-shape) configuration rather than a closed ring (O-shape) configuration. Such a cut may exist between two consecutive joint segments 17.

[0181] The annular element 7p may have a concentric central opening 6b, which allows for the assembly of modules associated with the pitch system. The central opening 6b can also serve as an access opening between the blade interior and the hub 1.

[0182] In summary, the entire structure of the reinforcing element 7p is symmetrical about the axis to achieve optimal load distribution.

[0183] In addition, the two mounting devices 12 for arranging the pitch actuator can be arranged symmetrically with respect to the axis, for example, equidistantly.

[0184] exist Figure 7 and Figure 8 In this process, the reinforcing element 7 may have a Y-shaped geometry with a first web 22a and at least one second web 22b, wherein at least one second web 22b is inclined relative to the extension direction of the axis of rotation and / or the first web 22a.

[0185] Therefore, the reinforcing element 7 is configured such that the first web 22a extends from the front end 4 of the hub 1 along the length direction to the rear end 3, while at least one second web 22b may be tilted relative to the axis of rotation and / or the first web 22a.

[0186] The mounting device 12 for supporting the pitch actuator can be disposed in one of the second webs, the first web 22a and / or the second web 22b. If there are two second webs 22b, the mounting device 12 can be disposed in each of the second webs 22b.

[0187] In addition, several other geometric shapes and combinations are possible.

[0188] Figure 9 A schematic cross-sectional view of the joint 8 according to an exemplary embodiment is shown.

[0189] The shown joint 8 includes a recessed portion 18, which is advantageously configured to accommodate at least a portion of a bolt 19 that passes through the bearing 25 into the rotor blade.

[0190] The recessed portion 18 is a local surface area on the joint 8, and its height is slightly lower than the surrounding surface of the joint 8 or the height of the reinforcing element 7.

[0191] The rounded corners or the curved recesses shown are an example of recessed portions 18.

[0192] Therefore, the bearing 25 of the rotor blade and thus the blade itself can be positioned at a precisely specified location by arranging the bolt 19 in the recess 18.

[0193] By arranging the bearings 25 accordingly, the load distribution can be improved, and the design of the hub 1 can be selected in a more varied or flexible manner.

[0194] List of reference numerals

[0195] 1,112 hubs

[0196] 2 hub body

[0197] 3. Rear end or first flange or shaft flange

[0198] 4. Front end

[0199] 5. Second flange or blade flange

[0200] 6. Flange region of the second flange

[0201] 6a Periphery of the second flange

[0202] 6b center opening

[0203] 7 reinforcing elements

[0204] 7a, 7b, 7c: Sections of the reinforcing elements along the length direction

[0205] 7p ring element

[0206] 8 joints

[0207] 9 Transition Section

[0208] 10. Pitch actuator support flange (or bracket)

[0209] The central and edge portions of the reinforcing elements 11a, 11b, 11c, 11d, and 11e in the width direction.

[0210] 12 Setting Device

[0211] 13 Arms

[0212] 13a A pair of first arms

[0213] 13b A pair of second arms

[0214] 14 openings

[0215] 15-hole opening

[0216] 16 recesses

[0217] 17 Joint Section

[0218] 18 Depressions

[0219] 19 Bolts on rotor blades

[0220] 20 towers

[0221] 22a, 22b First and second webs

[0222] 30, 31 controllers

[0223] 40 cabins

[0224] 25 bearing

[0225] 100 wind turbine

[0226] Rotor blades 101, 102, and 103

[0227] 104 bases

[0228] 110 rotor

[0229] AA to EE section

[0230] SS axis axis / rotation axis

[0231] PP axis perpendicular to the shaft axis

[0232] XX along the cross section of the range

Claims

1. A hub (1) for a rotor of a wind turbine, the hub (1) comprising: Hub body (2), the hub body (2) comprising: The first flange (3) is configured to attach the hub body to the rotor shaft of the wind turbine, and At least one second flange (5) configured to support rotor blades, the at least one second flange defining a second flange region (6) of the hub body. A reinforcing element (7) extends within at least a portion of the second flange region, the reinforcing element abutting the hub body at at least two joints (8). The thickness of the reinforcing element is constant, at least within a defined range.

2. The hub according to claim 1, wherein, The reinforcing element has a geometry selected from the following: rectangular shape, x-shaped shape, y-shaped shape, circular shape, elliptical shape, parabolic shape, hyperbola shape, and combinations thereof.

3. The hub according to any one of claims 1 or 2, wherein, The length direction of the reinforcing element extends along the rotation axis (SS) between the first flange of the hub body and the front end (4) opposite to the first flange.

4. The hub according to claim 3, wherein, The reinforcing element comprises one, two, or more segments (7a, 7b, 7c) spanning the length direction, such that the thickness of each segment is constant along the length direction.

5. The hub according to claim 4, wherein, The intersection of two adjacent segments of two or more of the segments includes a transition portion (9), which is constructed as a step, a tapered portion or a rounded corner.

6. The hub according to any one of claims 1 to 5, wherein, At least one of the joints (8) includes a recessed portion (18) configured to accommodate at least a portion of a bolt (19) for receiving the rotor blade.

7. The hub according to any one of claims 1 to 6, wherein, The reinforcing element includes at least two mounting devices (12) for supporting a pitch actuator for pitching the rotor blades.

8. The hub according to claim 7, wherein, The rotor shaft defines the axis of rotation (SS) and serves to support the at least two mounting devices of the pitch actuator: Arranged symmetrically with respect to the axis of rotation, and / or Arranged asymmetrically relative to the axis (PP) perpendicular to the axis of rotation.

9. The hub according to any one of claims 1 to 8, wherein, The reinforcing element has an X-shaped shape and includes a pair of first arms (13a) adjacent to the hub body near the first flange (3) and a pair of second arms (13b) adjacent to the hub body near the front end (4) opposite to the first flange (3).

10. The hub according to claim 9, wherein: The pair of first arms (13a) define a first angle between the pair of first arms, and the pair of second arms (13b) define a second angle between the pair of second arms. The second angle is different from the first angle.

11. The hub according to any one of claims 9 or 10, wherein: The periphery (6a) of the second flange and any two adjacent arms of the pair of first arms and the pair of second arms define the opening (14).

12. The hub according to any one of claims 9 to 11, wherein, An opening (15) is provided at the intersection area between the pair of first arms and the pair of second arms.

13. The hub according to any one of claims 1 to 8, wherein, The reinforcing element includes an annular element (7p) and a plurality of recesses (16) are provided between the annular element (7p) and the periphery (6a) of the second flange.

14. The hub according to claim 13, wherein: Each of the plurality of recesses has a radial range and a circumferential range, and the circumferential range of at least one recess is greater than the radial range.

15. The hub according to any one of claims 1 to 8, wherein, The reinforcing element includes a first web (22a) and at least one second web (22b), wherein the at least one second web is inclined relative to the extension direction of the axis of rotation and / or the first web.

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