• 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:

    公开号:DK201600094U1
    申请号:DK201600094U
    申请日:2016-08-25
    公开日:2016-09-23
    发明作者:Lihua Liu
    申请人:Gen Electric；
    IPC主号:
    专利说明:

    FIELD OF THE INVENTION
    The present invention relates generally to the wind turbine region, and more particularly to mill blades having an improved front or trailing edge joining line.
    BACKGROUND OF THE INVENTION Mill blades are the primary elements of wind turbines for converting wind energy to electrical energy. The wings have a cross-sectional profile corresponding to a support plane, so that, during operation, air flows over the wing and produces a pressure difference between the sides. Therefore, a lifting force directed from a pressure side to a suction side acts on the wing. The lifting force generates a torque on the main rotor shaft, which is adapted to a generator for producing electricity.
    Typically, the mill blades consist of an upper (suction side) shell and a lower (pressure side) shell joined by joining lines along the trailing edge and leading edge of the blade. The joint lines are generally formed by applying a suitable joint paste or composition along the joint line to a minimum formed joint width between the shell elements. However, the joint paste tends to migrate beyond the formed joint width and into the inner wing cavity, especially along the trailing edge of the wing. This excess joint paste can add significant weight to the blade, thus adversely affecting the blade's efficiency and overall wind turbine performance. The excess joint paste can also break off and cause damage to the internal structure and components during the operation of the wind turbine.
    Thus, the industry will benefit from an improved joint line design which reduces the amount of excess joint paste migrating into the wing cavity, especially along the trailing edge of the milling blade.
    BRIEF DESCRIPTION OF THE INVENTION
    Aspects and advantages of the invention will partly be described in the following description or will be obvious from the description, or may be experienced in the practice of the invention.
    In accordance with aspects of the invention, a wind turbine blade is provided with an upper shell element and a lower shell element. The shell elements define an interior cavity therebetween and are joined at a leading edge and a trailing edge of the wing by a joining paste along a joining line having a formed width. A joint paste cap is disposed in the interior cavity between the upper and lower shell members along at least one of the front or back edge joint lines. The cap includes a head facing the respective edge and tugs extending rearwardly from the head in a biased engagement against the upper and lower shell members, in a V-shaped configuration. With this configuration, the cap constitutes a barrier element at the joining line against migration of excess joining paste further into the interior cavity.
    The cap may be formed in various ways such that the joining paste is formed between the leg members and the upper and lower shell members along at least a portion of the leg members. For example, the leg members may extend at a generally constant angle from the head. In an alternative embodiment, the legs may be arched, staggered, or have a different backward profile.
    In certain embodiments, the cap may be a preformed member with generally rigid (shape retaining) leg members extending rearwardly of the head and having a length, angular orientation and bending relative to the head so that they are biased toward the upper and lower extremities. lower shell element. In an alternative embodiment, the cap may be designed as a generally flat component which is bent to an operating position at the joining line by a traction applied to the head. In this embodiment, a bending clearance angle may be defined in the head to ensure the final desired mode of operation of the cap.
    The cap may be formed of various suitable materials and the invention is not limited to any particular material. In one embodiment, the cap is formed of a material which is permeable to air and impervious to the bonding paste.
    The present invention also encompasses various method embodiments for forming a joint between the upper and lower shell elements of a wind turbine blade along at least one of the leading edge or trailing edge of the blade. The methods include placing an amount of joining paste along a defined joining line location of the leading edge or trailing edge. A cap is then placed in one of the shell elements in an initial position within the joining paste along the joining line, the cap having a head facing the joining line and the tapered portions extending backward from the head. Alternatively, the cap can be placed at the same time as or before applying the joining paste. Activation lines, such as strings, cables, wires, and the like, are attached to the head and projected from the shell member beyond the leading edge or trailing edge. The shell elements are joined along the leading edge and the trailing edge so that the tugs of the cap are biased against the shell elements. The activation lines are then pulled to move the cap toward the leading edge or trailing edge to an operating position defining a desired joint width placement. Thus, the cap constitutes a barrier to migration of excess joint paste into the interior cavity of the wing and tows compresses the joint paste and causes excess joint paste and air to be forced out from the leading or trailing edge as the cap is pulled toward its operating position.
    The invention also includes a wind turbine with one or more turbine blades configured with the unique joint line configuration described herein.
    These and other features, aspects and advantages of the present invention will be better understood with reference to the following description and appended claims. The accompanying drawings, which are incorporated into and form part of this specification, illustrate embodiments of the invention and, together with the specification, serve to explain the principles of the invention.
    BRIEF DESCRIPTION OF THE DRAWINGS
    A complete description enabling the practice of the present invention, including the best mode of application to one of ordinary skill in the art, is set forth in the specification which refers to the accompanying figures, in which: 1 is a perspective view of a conventional wind turbine; FIG. 2 is a perspective view of an embodiment of a wind turbine blade; FIG. 3 is a cross-sectional view of an example of wind turbine blades according to aspects of the invention; FIG. 4 is an enlarged cross-sectional view of the trailing edge of a wind turbine blade with a joint cap in accordance with aspects of the invention; FIG. 5 is a cross-sectional view of the embodiment of FIG. 4 with the joint cap in its operating position; FIG. 6 is a cross-sectional view of another embodiment of a trailing edge joint cap assembly; FIG. 7 is a cross-sectional view of yet another embodiment of a tow joint cap assembly; perspective view of a holster embodiment; FIG. 8 is a sectional view of a joint cap assembly at the leading edge of a wind turbine blade with the joint cap in an initial position; FIG. 9 is a sectional view of the embodiment of FIG. 8 with the joint cap in its operating position; FIG. 10 is a perspective view of a wind turbine blade with activation lines along the leading edge and the trailing edge of the wing; and FIG. 11 is a side sectional view of the upper and lower shell members of the respective molds with joining caps and activation lines along the leading edge and trailing edge of the wing.
    DETAILED DESCRIPTION OF THE INVENTION
    A detailed discussion of embodiments of the invention will now follow, in which one or more examples are illustrated in the drawings. Each example is provided by way of explanation of the invention and is not a limitation of the invention. Indeed, it will be apparent to those skilled in the art that various modifications and variations may be made in the present invention without departing from the scope or spirit of the invention. For example, features illustrated or described as part of one embodiment may be used with another embodiment to form yet another embodiment. Thus, the present invention is intended to include such modifications and variations which fall within the scope of the appended claims and their equivalents.
    FIG. 1 illustrates a wind turbine 10 of conventional construction. The wind turbine 10 includes a tower 12 with a nacelle 14 mounted thereon. A plurality of mill blades 16 are mounted on a rotor hub 18, which in turn is connected to a primary flange rotating a main rotor shaft. The wind turbine's components for electricity generation and control are housed in the nacelle 14. The picture in fig. 1 is provided for an illustrative purpose only for placing the present invention in an exemplary application area. It is to be understood that the invention is not limited to any particular type of wind turbine configuration.
    FIG. 2 and 3 provide a more detailed view of a wind turbine blade 16. The blade 16 includes an upper shell element 20 and a lower shell element 22 with an internal cavity 25 defined between the shell elements. The upper shell member 20 may be formed as the suction side surface of the blade 16, while the lower shell member 20 may be formed as the pressure side surface of the blade. The blade 16 includes a leading edge 24 and a trailing edge 26, as well as a root part 28 and a tip portion 30. As is well known in the art, the upper shell member 20 and the lower shell member 22 are joined by a joining line 36 along the leading edge 24 and along a joint. line 37 at the trailing edge 26. In forming these joining lines 36, 37, a joint viscous paste 34 is applied in liquid viscous form between adjacent laminate surfaces of the shell elements 20, 22 along the length of the joining lines 36, 37. It is to be understood that the term "joining paste" is used herein. in a generic sense, and includes any type of adhesive or bonding material applied in an initially liquid state. Which type of joint paste 34 is not particularly relevant to the present invention, and any suitable type of epoxy, composition or other material can be used in this regard.
    The bonding paste 34 is typically applied in a sufficient amount and pattern to thereby establish a padded joint line width 38 (Fig. 4) at the leading edge 24 and the trailing edge 26 ensuring a minimum of connected surface area between the components along the length of the respective joining lines 36. 37. The design criteria for joint line width 38 and thickness may vary between different types of blades based on any combination of design factors well known to those skilled in the art.
    A particular problem associated with the conventional system and method of applying the joint paste 34 is that excess joint paste is pressed out between the abutting surfaces of the shell elements 20, 22 into the interior cavity 25 and eventually cure to a hard mass. which adds significant weight to the blade 16. The excess mass of joint paste does not add any structural integrity or other useful purpose to the blade 16 and, if torn off, results in a rattling sound from the blades during operation of the turbine, which is a typical complaint from wind turbine operators.
    Still referring to FIG. 2 and 3, a cap 50 is disposed within the interior cavity 25 between the upper and lower shell members 20, 22 along either one or both the front and rear edge joining lines 36, 37. The cap 50 need not extend along its entire length. of the joining lines 36, 37, as shown in FIG. 2, and may instead extend along some or all of the respective joining lines where the advantages of cap 50 are desired, which is described in more detail below. In the embodiment of FIG. 2 and 3, the respective joint caps 50 are disposed along the leading edge joint line 36 and the rear edge joint line 37.
    With reference to FIG. 4 and 5, a particular embodiment is illustrated in which the cap 50 is formed with a head 52 facing the respective joining line, in this case the trailing edge joining line. The lug members 56 extend rearwardly from the head 52 in a general V-shape, at an angle and length, thereby being biased in a frictional engagement with the upper and lower shell members 20, 22. FIG. 4 shows the cap 50 in an initial position between the shell elements 20, 22. FIG. 5 shows the cap 50 after it has been inserted into its operating position so that the head 52 is generally positioned at a location 38 corresponding to a desired joint width. Tow legs 56 bend inward toward head 52 as the cap 50 is pulled to the position shown in FIG. 5th
    It is to be understood from FIG. 4 and 5, when the cap 50 is positioned in its operating position as shown in FIG. 5, the cap constitutes an inward locking member along the joining line to prevent migration of excess joining paste 34 further into the interior cavity 25. It should also be understood that, by moving the cap 50 from the position of FIG. 4 to the position of FIG. 5, air which may be trapped in the joint paste 34 is forced out through the open trailing edge 26 between the shell elements 20, 22, thereby reducing the likelihood of damaging air pockets or voids in the cured joint paste 34. In addition, the cap 50 helps forming a smooth, rounded joining edge that minimizes local stress concentrations in the joining paste 34.
    The cap 50 may be made of various suitable materials or combinations of materials to achieve the desired properties of the device. For example, the cap 50 may be made of a material which is permeable to air but impervious to the joining paste. With this type of material, air which can be trapped within the joint paste 34 can also escape through the cap 50 as the cap is moved to its operating position. For example, the cap 50 may be formed of an ordinary base material which is an open weave net material having the desired permeability properties. The base material may be treated or modified so that it is substantially impervious to the joining paste 34, but remains permeable to air. For example, a coating, such as a suitable resin, can be applied to the base material to render the material substantially impervious to the joining paste 34.
    As mentioned, a suitable cap 50 in accordance with aspects of the invention may be used along one of or along both the leading edge 24 and the trailing edge 26. In the embodiment shown in FIG. 4 and 5, the cap is disposed along the joining line of the trailing edge 26. FIG. Figures 8 and 9 show an embodiment in which a cap 50 is used along the joining line formed at the leading edge 24 between overlaps in the region of the upper 20 and the lower 22 shell member.
    The joint cap 50 may be differently formed within the scope of the invention. For example, in the embodiment shown in FIG. 4 and 5, the cap 50 is formed such that the joint paste 34 is formed between the leg members 56 and the upper and lower shell members 20, 22 along at least a portion of the leg members 56. This configuration results in a stress-relieving profile at the inward end of the joint paste. .
    In certain embodiments, the leg members 56 may extend away from the head 52 at a generally constant angle, as shown in FIG. 4 and 5. In alternative embodiments, the legs 56 may extend at different angles and may, for example, be arcuate. In further alternative embodiments, the leg members 56 may have a staggered or staged configuration with an overall general orientation from the head 52 in opposite directions to the upper and lower shell members 20, 22.
    A particular embodiment of the cap 50 is shown in the figures as a generally V-shaped component in which the legs 56 diverge at a generally constant angle at the head 52. This configuration may be desired as it provides sufficient bending for the legs 56 as as they move to their operating position as shown in FIG. 5th
    In an alternative embodiment shown for example in FIG. 7, the cap has a configuration wherein the head is defined as a generally flat section 54 extending transversely along at least a portion of the joint width line 38. The joint cap 50 has, in this particular embodiment, a general echelon shape. The legs 56 in this particular embodiment will not have the same degree of flexibility as the legs 56 in the embodiment of FIG. 5, but may be desirable in certain types of wing configurations.
    In particular embodiments, the cap 50 may be a preformed member where the tug elements 56 are relatively rigid and maintain their angular position relative to the head 52 in an unstressed state of the cap 50. The tug elements 56 in this embodiment extend rearwardly from the head 52 and having a length, angular orientation, and bending relative to the head 52, thereby being biased toward the upper and lower shell members at least in the final operating position of the cap 50. With reference to FIG. 4, it may be desirable that the preformed cap 50 also has a size and configuration such that the legs 56 engage the upper and lower shell members 20, 22 in the initial position of the cap 50 so as to define an output limit of the joining paste 34. during the joining and curing process.
    FIG. 6 illustrates an embodiment in which the joint cap 50 is initially provided as a relatively flat member 60, such as a plate member. The flat member 60 is initially positioned in the position shown in FIG. 6 and then moved to an operating position shown by the dashed line configuration of FIG. 6 by exerting a pulling force on the plate member 60 against the trailing edge 26. This pulling force causes the plate member 60 to bend into a V-shaped configuration illustrated by the dotted lines in FIG. 6. Any type of bending release angle 62 can be defined in the flat member 60 at the location where the bend is desired in the flat member 60.
    Referring again to FIG. 4 and 5, the joint cap 50 is moved from its initial position to its final operating position by applying a pulling force on the head 52 to the trailing edge 26. For this purpose, any type of actuating liner 64 may be provided along the length of the cap 50. , strings, cables, wires, or any other line component suitable for pulling the cap 50 to its operating position and causing excess joint paste 34 to be ejected through the open rear end 26 between the upper and lower shell members 20, 22. By reference to FIG. 10 and 11, a vane 16 is shown with caps 50 positioned substantially along the entire length of the front and rear edges 24, 26. Several actuating lines 64 are spaced apart at each of the edges 24, 26 and are secured to the head of the respective caps 50.
    With reference to FIG. 10, the blade shell components 20, 22 can be formed in any conventional molding process within their respective molds 66. An amount of joint paste is placed along the joint line locations of the leading edge and the trailing edge 24, 26. The respective caps 50 are then placed in one of the shell elements in an initial position within the joint paste. the respective edges 24, 26 where the head of the cap 50 faces the respective edge 24, 26 and the lugs 56 extend rearwardly of the head 52. It is also to be understood that the preceding two steps can be reversed where the joining paste is placed in the shell element, after the cap has been placed along the leading edge or trailing edge.
    The activation lines 64 connected to the cap head 52 are projected from the shell elements 20, 22 and the molds 66 beyond the leading edge and the trailing edge 24, 26. The mold halves 66 are then closed and the activation lines 64 are tensioned and pulled away from their respective edges 24, 26 for thus pulling the cap 50 to its final operating configuration. Any marking or other indication can be provided on the activation line 64 to indicate when the cap 50 is in its final operating position. The shell elements can then be injected in a normal course.
    Various process embodiments may also include cutting off excess joint paste 34 which has moved beyond the leading edge or trailing edge 24, 26 during the curing process. Further, the method may include measuring the amount of excess joint paste cut from the leading edge or trailing edge 24, 26 and reducing the amount of joint paste initially placed in a subsequent wing shape by the measured amount.
    The activation lines 64 can be cut off after the joint paste 34 is cured, as indicated in FIG. 5 and 9.
    The present invention also encompasses any configuration of a wind turbine 10 (Fig. 1) wherein at least one of the blades 16 is configured with the unique advantages of the invention as described above.
    While the present article has been described in detail with regard to specific examples of embodiments and methods thereof, it will be appreciated that those skilled in the art, upon attaining an understanding of the foregoing, may readily produce alterations to, variations in, and equivalents for these embodiments. Therefore, the scope of the present disclosure is derived from examples rather than limitations, and the disclosure does not exclude such modifications, variations and / or additions to the subject matter as would be obvious to one of ordinary skill in the art.
    权利要求:
    Claims (7)
    [1]
    A wind turbine blade, the blade comprising: an upper shell member and a lower shell member; wherein the upper shell member and the lower shell member define an interior cavity therebetween and are joined by a joint paste at respective joint lines along the front and rear edges of the wing, the joint lines having a formed width; and, a cap disposed within the interior cavity between the upper and lower shell members along at least one of the front or back edge joining lines, the cap comprising a head facing the leading edge or trailing edge and tugging portions extending rearwardly of the head in a biased engaging the upper and lower shell members; wherein the cap constitutes a locking member at the joining line toward migration of the joining paste further into the interior cavity and the leg members extending backward at a generally constant angle from the head.
    [2]
    The wind turbine blade of claim 1, wherein the cap is formed such that the joining paste forms between the leg members and the upper and lower shell members along at least a portion of the leg members.
    [3]
    The wind turbine blade of claim 1, wherein the cap comprises a generally V-shaped component.
    [4]
    The wind turbine blade of claim 2, wherein the cap comprises a preformed member having generally rigid tugging elements extending rearwardly from the head, which leg members have a length, an angular orientation, and a bend relative to the head, thereby being biased toward the upper and lower shell element.
    [5]
    The wind turbine blade of claim 2, wherein the cap comprises a generally flat component bent to an operating position at the joining line by a traction applied to the head.
    [6]
    The wind turbine blade according to claim 5, further comprising a bending release angle defined at the head.
    [7]
    The wind turbine blade according to claim 1, wherein the cap is formed of a material which is permeable to air and impervious to the joint paste.
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    同族专利:
    公开号 | 公开日
    DK201600094Y4|2017-02-10|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    2021-11-03| UUP| Utility model expired|Expiry date: 20211101 |
    优先权:
    申请号 | 申请日 | 专利标题
    DKBA201600094U|DK201600094Y4|2016-08-25|2016-08-25|Wind turbine blades with cap based sammenføjningskonfiguration|DKBA201600094U| DK201600094Y4|2016-08-25|2016-08-25|Wind turbine blades with cap based sammenføjningskonfiguration|
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