• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to a wind generator system of the type comprising: a series of blades; a hub intended to receive the series of blades; and a bearing arranged between each of the blades of the blade series and the hub; the bearing comprising an outer annular element and an inner annular element with rotational capacity relative to each other allowing the blade to tilt, characterized in that the bearing comprises a series of rolling elements and a stiffening plate attached to the inner annular element and because the plate stiffener comprises at least one bearing track intended to receive rolling elements. In addition, the bearing associated with said system is disclosed. (Machine-translation by Google Translate, not legally binding)
    公开号:ES2763634A1
    申请号:ES201831161
    申请日:2018-11-29
    公开日:2020-05-29
    发明作者:Santa Cruz Aitor Zurutuza；Rodriguez Haritz Zabala；Ugarteburu Iker Urresti
    申请人:Laulagun Bearings SL；
    IPC主号:
    专利说明:

    [0003] TECHNICAL SECTOR
    [0005] The invention falls within the sector of electric power generators from the transformation of wind energy. Specifically, the present invention refers to a wind generator system that has a series of blades each one of said blades attached to a hub by means of a blade bearing and, additionally, providing at least one stiffening plate to provide greater physical support to the union between blade and hub.
    [0007] BACKGROUND OF THE INVENTION
    [0009] Large dimension bearings are known for large devices such as wind generator systems, ie, wind turbines, and more specifically to blade bearings that allow tilt movement (or pitch, English expression that is most widely used in the art) wind turbine blades, although they can be used in any other field.
    [0011] The bearings can have several concentric rings between which rolling elements are arranged on raceways that transmit loads from one raceway to the other while rolling and creating relative movement between them. These raceways should preferably have very good mechanical characteristics of resistance and hardness, that is why they are usually tempered, ensuring a minimum hardening thickness.
    [0013] On the other hand, the existence of stiffening plates in wind turbines is known, that is, plates that provide the physical support
    [0014] between the blade and / or hub and the rings attached to them. These plates are usually bolted between the blade and the bearing ring and / or on the outer surface of the ring. The screwed connection ensures the preload between the different joined elements. The geometry of these plates is defined by their objective: to stiffen the lower area of the blade and / or to support the actuators. In any case, its geometry is usually adequate to each objective, usually defining more rigid areas (thickness changes) and / or areas with holes, to define non-homogeneous stiffnesses.
    [0016] DESCRIPTION OF THE INVENTION
    [0018] The present invention relates to a wind turbine incorporating a pitch bearing and a stiffening plate in which at least one of the raceways is arranged on the stiffening or pitch plate. In this way, the rolling elements associated with the bearing (be they rollers, cylinders, needles, etc.) will roll on the surface defined as the pitch plate raceway. The running surface will preferably have the appropriate properties so that there is no breakage under extreme loads (permanent deformations on the running surface that exceed the breaking criteria) and under fatigue loads (avoiding possible breaks due to rolling fatigue below the surface), for example by surface treatment. The surface treatment can also be carried out in order to minimize friction and possible initial breaks in the surface. In an exemplary embodiment, said surface treatment may be, for example, by induction hardening, reaching a depth of final hardening layer sufficient to avoid breakage at extreme loads and fatigue so that additional hardness is given to this area. In short, the running surface will have a greater hardness than the rest of the stiffening plate. In an exemplary embodiment, the raceway may have a hardness of approximately 57 HRC. The base stiffening plates must have a hardness equal to that of the bearing base hardness in order for it to hold structurally, said bearing base hardness being at least 275 HRB.
    [0020] In the invention presented, in addition, a bearing that has a stiffening plate that incorporates a raceway intended to interact with the rolling elements. The raceway may, in one embodiment, be tempered to obtain the resistance characteristics necessary for it to work correctly under fatigue and extreme load conditions. Therefore, the plate replaces at least one bearing raceway, being a structural part of the bearing and working on the distribution of loads thereof, which helps to reduce the weight of the plate-bearing assembly and gives the bearing a plate of reinforcement with considerable area and stiffness.
    [0021] Ultimately, the present invention discloses a wind generator system of the type comprising:
    [0022] • a series of shovels;
    [0023] • a hub intended to receive the series of blades; and
    [0024] • a bearing arranged between each of the blades of the blade series and the hub;
    [0025] the bearing comprising an outer annular element and an inner annular element with rotational capacity relative to each other allowing the blade to tilt, characterized in that the bearing comprises a series of rolling elements and a stiffening plate attached to the inner annular element and because the plate stiffener comprises at least one bearing track intended to receive rolling elements.
    [0027] In an exemplary embodiment, the rolling elements can be rollers, needles and / or cylinders.
    [0029] Preferably, the inner annular element comprises a second bearing track intended to receive rolling elements. In this case, the inner annular element can have a projection in the radial direction of the element and because the second bearing track is arranged on said projection.
    [0031] In one embodiment, the stiffening plate comprises a reinforcement in the area in which the bearing track is arranged. Said reinforcement may comprise, for example, a surface treatment such as tempering that gives greater hardness to the area associated with the raceway.
    [0033] More preferably, the connection between the inner annular element and the stiffening plate is made by means of screws.
    [0035] Furthermore, in one example, the blade can be arranged adjacent to the stiffening plate. However, the blade can also be arranged adjacent to the inner annular element.
    [0037] As for the construction details of the bearing, this may be, for example, a three-row rolling body bearing, with the stiffening plate arranged to receive one of the rows of rolling bodies. In addition, the stiffening plate can comprise a plurality of rolling tracks intended to receive the rolling elements associated with a plurality of rows.
    [0039] In another exemplary embodiment, the system may comprise two parallel stiffening plates, each having a bearing track intended to receive rolling elements.
    [0041] Furthermore, the present invention discloses a bearing of the type that has an outer annular element, an inner annular element and rolling elements that allow the rotational capacity between the inner annular element and the outer annular element, characterized in that it comprises a plate stiffening unit attached to the inner annular element, said stiffening plate comprising at least one bearing track in contact with rolling elements.
    [0043] Preferably, the bearing is a three row bearing, with at least one of the rows being associated with the bearing raceway.
    [0045] More preferably, the stiffening plate comprises a plurality of bearing tracks each being associated with a row of rolling elements.
    [0047] In an embodiment of the present invention, the stiffening plate comprises a reinforcement in the area of the plate in which the bearing track is arranged. The reinforcement may comprise, for example, the tempering of the area in which the raceway is arranged.
    [0049] More preferably, the inner annular element has a projection in the radial direction of the element and because it comprises a second bearing track on said projection associated with a row of rolling elements
    [0051] BRIEF DESCRIPTION OF THE DRAWINGS
    [0053] Figure 1 shows a mechanical exploded view showing the parts of a wind turbine system that incorporates a pitch plate.
    [0054] Figure 2 shows a detail of an embodiment of a wind turbine according to the present invention.
    [0055] Figures 3A-3D show schematically exemplary embodiments of a bearing according to the present invention.
    [0057] PREFERRED EMBODIMENT OF THE INVENTION
    [0059] Figure 1 shows a wind turbine system (1) according to the present invention. In the wind turbine (1) of figure 1 it is observed that it has a series of blades (2) attached to a hub (3) which, in turn, is mechanically connected to a nacelle that has, among others, a electric power generator (4), specifically, a rotational energy transducer from the movement caused by the blades (2) to electric power.
    [0061] As can be seen in Figure 1, each of the blades (2) is connected to the hub (3) by means of a bearing (5), said bearing being configured to allow rotation (R) of the blade (2) that is, allow the pitch angle of each blade (2) to be modified.
    [0063] Figure 2 shows a detail of an example of hub (3) incorporating a bearing (5) for interconnection between the blades (2) and the hub (3) according to the present invention. Specifically, the hub (3) has a series of housings intended to receive the bearings (5).
    [0065] Each of the bearings (5) has an outer annular element (51), an inner annular element (50) and a series of rolling bodies that allow relative rotation between the outer annular element (51) and the inner annular element. Furthermore, the bearing (5) has a stiffening plate (52) or pitch plate that is attached to the inner annular element and, therefore, also has rotational capacity with respect to the outer annular element (51).
    [0067] The stiffening plate (52) fulfills the function of providing the inner ring with greater rigidity, preventing its deformation. Consequently, the pitch plate (52) is in contact with substantially the entire surface of the inner annular element. Furthermore, in the bearing of the present invention, the stiffening plate is a structural part of the bearing (5) since it has a bearing track in contact with the rolling bodies.
    [0068] In embodiments of the present invention the stiffening plate occupies a substantial area of that defined by the interior of the interior annular element. In one embodiment, the stiffening plate (52) occupies at least 80% of the interior area of the interior annular element. In a particularly preferred embodiment, the stiffening plate (52) occupies at least 90% of the interior area of the interior annular element.
    [0070] Figures 3A-3D show examples of configurations of a bearing (5) for a wind turbine according to the present invention. The bearings (5) of Figures 3A-3D have in common that they have a first bolted connection (54) that joins the blade (2) to the assembly formed by the inner annular element (50) and the stiffening plate (52) and a second bolted connection (55) that joins the outer annular element (51) to the hub (3).
    [0072] In an exemplary embodiment, Figure 3A shows a bearing configuration incorporating a stiffening plate (52) as a structural element of the bearing. Specifically, Figure 3A shows a bearing that has an inner annular element (50) in the form of an inverted L, that is, it has a projection on the upper part of the bearing (the part of the bearing closest to the blade (2) ). In addition, the bearing has three rows of rolling bodies (53, 53 ’, 53’ ’). The first row (53) of rolling bodies is arranged so that the rolling bodies contact the protrusion of the inner annular element (50), the second row (53 ') contacts the body of the inner annular element (50) and the third die (53 '') comes into contact with the stiffening plate (52) so that the bearing partially rolls on a bearing race (520) with which the stiffening plate (52) is provided.
    [0074] Figure 3B shows another example of a bearing configuration according to the present invention. In the example of figure 3B, an inner annular element (50) is observed which, as in the case of figure 3A, is L-shaped but in a different orientation, in this case, the projection of the inner annular element (50). ) is arranged at the bottom of the bearing. In this case, the stiffening plate (52) is arranged in the upper part of the bearing so that it comes into direct contact with the blade (2). In addition, the stiffening plate (52) has a bearing track intended to receive the first row (53) of rolling bodies of the bearing.
    [0076] Figure 3C shows a particular embodiment in which the stiffening plate (52) is it has between two sections of the inner annular element (50). In this exemplary embodiment, it is shown that the stiffening plate (52) can have a plurality of raceways, for example, three raceways (520, 521,522) intended to receive three rows of bearings (53, 53 ', 53``) respectively.
    [0078] Figure 3D shows another example of embodiment in which the bearing has two stiffening plates (52, 52 ') at both ends of the inner annular element (50), each of the stiffening plates (52, 52') having a track bearing (520, 520 ') to receive, each one, a row of rolling elements (53, 53', 53 '').
    [0080] The use of the configuration shown in Figures 3A, 3B, 3C or 3D will depend on the need for stiffening (that is, the greater the number of plates, the greater stiffening), and the position of the pitch actuator in the system, which will require a different height of planar position in different cases. One of the advantages provided by the present invention is that we reduce the height of the inner ring-plate assembly of the prior art devices, consequently reducing the overall weight.
    权利要求:
    Claims (19)
    [1]
    1. Wind generator system of the type comprising:
    • a series of shovels;
    • a hub intended to receive the series of blades; and
    • a bearing arranged between each of the blades of the blade series and the hub;
    the bearing comprising an outer annular element and an inner annular element with rotational capacity relative to each other allowing the blade to tilt, characterized in that the bearing comprises a series of rolling elements and a stiffening plate attached to the inner annular element and because the plate stiffener comprises at least one bearing track intended to receive rolling elements.
    [2]
    2. System according to claim 1, characterized in that the rolling elements can be rollers, needles and / or cylinders.
    [3]
    3. System according to any of the preceding claims, characterized in that the inner annular element comprises a second bearing track intended to receive rolling elements.
    [4]
    4. System, according to claim 3, characterized in that the inner annular element has a projection in the radial direction of the element and in that the second bearing track is arranged on said projection.
    [5]
    5. System according to any of the preceding claims, characterized in that the stiffening plate comprises a reinforcement in the area in which the bearing track is arranged.
    [6]
    6. System according to claim 5, characterized in that the reinforcement comprises a surface treatment.
    [7]
    7. System according to claim 5, characterized in that the reinforcement comprises a temperate zone.
    [8]
    8. System according to any of the preceding claims, characterized because the union between the inner annular element and the stiffening plate is made by means of screws.
    [9]
    9. System according to any of the preceding claims, characterized in that the blade is arranged adjacent to the stiffening plate.
    [10]
    10. System according to any of claims 1 to 8, characterized in that the blade is arranged adjacent to the inner annular element.
    [11]
    11. System according to any of the preceding claims, characterized in that the bearing is a three-row bearing with rolling bodies, the stiffening plate being arranged to receive one of the rows with rolling bodies.
    [12]
    12. System according to claim 11, characterized in that the stiffening plate comprises a plurality of bearing tracks intended to receive the rolling elements associated with a plurality of rows.
    [13]
    13. System according to any of the preceding claims, characterized in that it comprises two parallel stiffening plates, each having a bearing track intended to receive rolling elements.
    [14]
    14. Bearing of the type that has an outer annular element, an inner annular element and rolling elements that allow rotational capacity between the inner annular element and the outer annular element, characterized in that it comprises a stiffening plate attached to the inner annular element comprising said plate stiffener at least one bearing track in contact with rolling elements.
    [15]
    15. Bearing, according to claim 14, characterized in that it is a three-row bearing, at least one of the rows being associated with the bearing track.
    [16]
    16. Bearing according to any of claims 14 or 15, characterized in that the stiffening plate comprises a plurality of bearing tracks, each of them being associated with a row of rolling elements.
    [17]
    17. Bearing according to any of claims 14 to 16, characterized in because the stiffening plate comprises a reinforcement in the area of the plate in which the bearing track is arranged.
    [18]
    18. Bearing, according to claim 17, characterized in that the reinforcement comprises tempering of the area in which the bearing track is arranged.
    [19]
    19. Bearing, according to any of claims 14 to 18, characterized in that the inner annular element has a projection in the radial direction of the element and in that it comprises a second bearing track on said projection associated with a row of rolling elements.
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    同族专利:
    公开号 | 公开日
    ES2763634B2|2020-11-24|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    EP2045464A2|2007-10-01|2009-04-08|Siemens Aktiengesellschaft|Pitch bearing for wind turbine rotor blades|
    US20130136602A1|2011-07-13|2013-05-30|Pierre Pasquet|Wind Turbine Rotor|
    US20140377069A1|2013-06-20|2014-12-25|General Electric Company|Pitch bearing assembly with stiffener|
    US20150003986A1|2013-06-27|2015-01-01|General Electric Company|Pitch bearing assembly with stiffener|
    法律状态:
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    优先权:
    申请号 | 申请日 | 专利标题
    ES201831161A|ES2763634B2|2018-11-29|2018-11-29|WIND GENERATOR AND BEARING SYSTEM FOR SUCH SYSTEM|ES201831161A| ES2763634B2|2018-11-29|2018-11-29|WIND GENERATOR AND BEARING SYSTEM FOR SUCH SYSTEM|
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