Blade root embedded part, blade root assembly having embedded connection structure, and blade

Abstract

A blade root embedded part, a blade root assembly having an embedded connection structure, and a blade. The blade root embedded part comprises: a sleeve body (1), wherein first arc surface regions (12) and second arc surface regions (11) are provided on the outer peripheral surface of the sleeve body (1); and interlocking portions (2) provided in the first arc surface regions (12) of the sleeve body (1), wherein the interlocking portions (2) are formed by extending from the outer circumferential surface of the sleeve body (1) in a direction away from the axis of the sleeve body (1).

Description

Blade root embedded part, blade root assembly with embedded connection structure and blade

[0001] Cross Reference to Related Applications

[0002] This application claims priority to Chinese Patent Application 2024110776116, filed on August 7, 2024, entitled “Blade root embedded part, blade root assembly with embedded connection structure and blade”, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the technical field of wind power generation, in particular to a blade root embedded part, a blade root assembly with embedded connection structure and a blade. BACKGROUND

[0004] With the development of the wind power industry, the size, length and weight of wind turbine blades are becoming larger and larger, which increases the blade root connection load accordingly, and higher requirements are placed on the connection strength of the wind turbine blade root and the hub. Currently, there are two forms of blade root connection, namely drilling connection and embedded connection. Compared with drilling connection, embedded connection is more widely used.

[0005] In related technologies, although the connection between the bolt sleeve and the wrapped wire bundle is strengthened, the bolt sleeve and the wrapped wire bundle can still be pulled out as a whole, and the connection strength is not ideal.

[0006] SUMMARY

[0007] The present application provides a blade root embedded part, a blade root assembly with embedded connection structure and a blade. One of the purposes of the blade root embedded part is to improve the connection strength.

[0008] An embodiment of the first aspect of the present application provides a blade root embedded part, which comprises a sleeve body and a pulling part. The sleeve body is provided with a first curved surface area and a second curved surface area around the outer peripheral surface of the sleeve body. The pulling part is arranged in the first curved surface area of the sleeve body, and the pulling part is formed by extending the outer peripheral surface of the sleeve body away from the axis direction of the sleeve body.

[0009] According to the embodiment of the first aspect of the present application, on the side where the sleeve body penetrates the bolt, the included angle between the extension direction of the pulling part and the axis of the sleeve body is R; the value range of R is 30° to 90°.

[0010] According to any one of the preceding embodiments of the first aspect of the present application, the value of R is 90°.

[0011] According to any one of the foregoing embodiments of the first aspect of the application, the number of the first arc surface regions is two, and the two first arc surface regions are symmetrically distributed on the sleeve body; the number of the second arc surface regions is two, and the two second arc surface regions are symmetrically distributed on the sleeve body; the first arc surface regions are located between the second arc surface regions, and the area of the first arc surface regions is smaller than the area of the second arc surface regions.

[0012] According to any one of the foregoing embodiments of the first aspect of the application, the straight line along the extension direction of the pulling part intersects the axis of the sleeve body.

[0013] According to any one of the foregoing embodiments of the first aspect of the application, the straight line along the extension direction of the pulling part is non-planar with the axis of the sleeve body.

[0014] According to any one of the foregoing embodiments of the first aspect of the application, part of the straight line along the extension direction of the pulling part intersects the axis of the sleeve body, and part of the straight line along the extension direction of the pulling part is non-planar with the axis of the sleeve body.

[0015] According to any one of the foregoing embodiments of the first aspect of the application, the included angle between the pulling parts in the same first arc surface region is 0°, and the included angle between the pulling parts in the two first arc surface regions is 180°.

[0016] According to any one of the foregoing embodiments of the first aspect of the application, along the axis direction of the sleeve body, the outer peripheral surface of the sleeve body comprises alternating concave parts and convex parts; in the first arc surface region, the pulling parts are located on the concave parts and / or the convex parts.

[0017] According to any one of the foregoing embodiments of the first aspect of the application, in the first arc surface region, the pulling parts are located on the convex parts.

[0018] According to any one of the foregoing embodiments of the first aspect of the application, the distance between the free end of the pulling part located on the concave part and the axis of the sleeve body is a, the distance between the free end of the pulling part located on the convex part and the axis of the sleeve body is b, and the value of a is not greater than the value of b.

[0019] According to any one of the foregoing embodiments of the first aspect of the application, the value of a is equal to the value of b.

[0020] According to any one of the foregoing embodiments of the first aspect of the application, the pulling part is in the shape of a column, and is integrally formed with the sleeve body and / or detachably connected to the sleeve body.

[0021] According to any one of the foregoing embodiments of the first aspect of the application, along the extension direction of the pulling part, the cross-sectional area of the pulling part gradually decreases.

[0022] According to any one of the foregoing embodiments of the first aspect of the present application, the cross-sectional area of the pull-out portion is constant along the extension direction of the pull-out portion.

[0023] According to any one of the foregoing embodiments of the first aspect of the present application, the cross-sectional area of a part of the pull-out portion gradually decreases along the extension direction of the pull-out portion, and the cross-sectional area of another part of the pull-out portion is constant.

[0024] According to any one of the foregoing embodiments of the first aspect of the present application, the sleeve body and the pull-out portion are detachably connected through threads.

[0025] According to any one of the foregoing embodiments of the first aspect of the present application, the pull-out portion is provided with an outward protruding section at the end away from the sleeve body, and the outward protruding section is hook-shaped.

[0026] According to any one of the foregoing embodiments of the first aspect of the present application, the cross-sectional area of the outward protruding section is greater than that of the adjacent part of the pull-out portion.

[0027] According to any one of the foregoing embodiments of the first aspect of the present application, the pull-out portion is provided with an outward protruding section at the end away from the sleeve body, the outward protruding section is hook-shaped, and the cross-sectional area of the outward protruding section is greater than that of the adjacent part of the pull-out portion.

[0028] According to any one of the foregoing embodiments of the first aspect of the present application, the hook shape of the outward protruding section is any one of L-shaped, T-shaped, and J-shaped.

[0029] In a second aspect, some embodiments of the present application provide a blade root assembly with a pre-buried connecting structure, comprising a blade root body and a pre-buried connecting structure; the blade root body comprises an outer wall, an inner wall, and a filler layer filled between the outer wall and the inner wall; the pre-buried connecting structure comprises a blade root pre-buried piece embedded in the filler layer; the sleeve body of the blade root pre-buried piece is pre-buried in the filler layer, and the pull-out portion of the blade root pre-buried piece is inserted into the outer wall and / or the inner wall.

[0030] According to the embodiment of the second aspect of the present application, the thickness of the outer wall is greater than the depth of the pull-out portion inserted into the outer wall, and the difference between the two is in the range of 0.5mm to 3.5mm; the thickness of the inner wall is greater than the depth of the pull-out portion inserted into the inner wall, and the difference between the two is in the range of 0.5mm to 3.5mm.

[0031] According to any one of the foregoing embodiments of the second aspect of the present application, the difference between the thickness of the outer wall and the depth of the pull-out portion inserted into the outer wall is 2mm; the difference between the thickness of the inner wall and the depth of the pull-out portion inserted into the inner wall is 2mm.

[0032] According to any one of the foregoing embodiments of the second aspect of the application, the embedded connecting structure further comprises a winding layer, the winding layer being wound on the outer circumferential surface of the sleeve body, the thickness of the winding layer being less than the protruding height of the pull-out portion on the sleeve body.

[0033] According to any one of the foregoing embodiments of the second aspect of the application, the winding layer is a fiber bundle winding layer.

[0034] According to any one of the foregoing embodiments of the second aspect of the application, the blade root body is in a circular ring shape, and the sleeve body is in a plurality, the plurality of sleeve bodies being distributed along the circumferential direction of the filler layer.

[0035] According to any one of the foregoing embodiments of the second aspect of the application, the embedded connecting structure further comprises a filler block, the filler block being in a plurality, the plurality of filler blocks being distributed along the circumferential direction of the filler layer, each of the filler blocks being located between two sleeve bodies and being attached to the sleeve bodies.

[0036] According to any one of the foregoing embodiments of the second aspect of the application, the embedded connecting structure further comprises a wedge-shaped block, one end of the wedge-shaped block being inserted into a wedge-shaped area of the filler layer, and the other end of the wedge-shaped block being abutted with one end of the sleeve body.

[0037] According to any one of the foregoing embodiments of the second aspect of the application, a sealing member is mounted on the sleeve body at the abutted position of the wedge-shaped block and the sleeve body, the sealing member comprising a sealing plug and a sealing ring, the sealing ring being located between the sealing plug and the sleeve body.

[0038] In a third aspect, some embodiments of the application provide a blade, the blade comprising the blade root assembly with the embedded connecting structure according to any one of the technical solutions described above. BRIEF DESCRIPTION OF DRAWINGS

[0039] Features, advantages, and technical effects of the exemplary embodiments of the application will be described below with reference to the accompanying drawings.

[0040] FIG. 1 is a perspective structural schematic view of a blade root embedded part according to some embodiments of the application;

[0041] FIG. 2 is a front structural schematic view of a blade root embedded part according to some embodiments of the application;

[0042] FIG. 3 is a partial enlarged schematic view of FIG. 2 at A according to some embodiments of the application;

[0043] FIG. 4 is a front structural schematic view of a blade root embedded part according to some other embodiments of the application;

[0044] FIG. 5 is a partial enlarged schematic view of FIG. 4 at B according to some other embodiments of the application;

[0045] Fig. 6 is a front structural schematic view of a blade root embedded part according to some embodiments of the present application;

[0046] Fig. 7 is a partial enlarged schematic view of Fig. 6 at C according to some embodiments of the present application;

[0047] Fig. 8 is a side structural schematic view of a blade root embedded part according to some embodiments of the present application;

[0048] Fig. 9 is a side structural schematic view of a blade root embedded part according to some embodiments of the present application;

[0049] Fig. 10 is a longitudinal sectional view of a blade root assembly with embedded connecting structure according to some embodiments of the present application;

[0050] Fig. 11 is a partial enlarged schematic view of Fig. 10 at D according to some embodiments of the present application;

[0051] Fig. 12 is a transverse sectional view of a blade root assembly with embedded connecting structure according to some embodiments of the present application.

[0052] In the drawings, the drawings are not necessarily drawn according to the actual proportions.

[0053] Legend of reference signs: 1 - sleeve body; 11 - second arc surface area; 12 - first arc surface area; 13 - convex surface part; 14 - concave surface part; 2 - pulling part; 3 - inner wall; 4 - outer wall; 5 - wedge-shaped block; 6 - winding layer; 7 - filling block. DETAILED DESCRIPTION

[0054] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0055] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should be understood as the usual meaning understood by the skilled person in the field to which the embodiments of the present application belong.

[0056] In the description of the embodiments of the present application, the orientations or positional relationships indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0057] In addition, the technical terms "first", "second" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0058] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above-mentioned terms in the embodiments of the present application can be understood according to the specific circumstances.

[0059] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0060] Technical terms are explained as follows:

[0061] Drilling connection: After the composite wind turbine blade is formed, holes are drilled vertically and uniformly on the end face of the blade root, so that one end of the stud can be embedded into the blade root shell along the radial direction of the blade root through the hole, and connected and fixed with the transverse nut, and the other end is embedded into the fan hub, completing the connection of the blade root shell and the fan hub.

[0062] Pre-buried connection: The pre-buried part (generally including bolt sleeve, glass fiber reinforced plastic wedge block, circular foam wedge block) is pre-buried in the blade root composite material layer by embedding, and is poured together with the blade skin after the blade is prepared and formed. After the blade is prepared and formed, the stud is screwed into the bolt sleeve to complete the connection of the blade and the fan hub.

[0063] Bolt sleeve drawing force: the combined force of the metal deformation resistance of the bolt sleeve and the friction force of the contact surface between the bolt sleeve and the composite material during the drawing process.

[0064] With the increasing size, length and weight of wind turbine blades, the blade root connecting load is also increasing, and higher requirements are placed on the connection strength of the wind turbine blade root and the hub. Currently, the blade root connection mainly has two forms of drilling connection and pre-buried connection, wherein the failure modes of the pre-buried connection structure are mainly bolt fracture and pre-buried bolt sleeve pull-out failure.

[0065] To deal with the pre-buried bolt sleeve pull-out failure, the related technology also provides some solutions, for example, in the patent application file with the Chinese patent application publication number CN115111249A, the publication date of September 27, 2022, and the invention name of a pre-buried bolt sleeve and a wind turbine, the outer surface of the pre-buried bolt sleeve is modified, and a plurality of different groove areas are designed, and the pre-buried bolt is wound around the glass fiber layer when in use; in the patent application file with the Chinese patent application publication number CN114770984A, the publication date of July 22, 2022, and the invention name of a bolt sleeve for connecting the root of a wind turbine blade and a method for improving the pre-buried strength thereof, the outer thread of the bolt sleeve is also modified, and a micro-groove structure is processed, and the groove is filled with a wire bundle when in use.

[0066] The above-mentioned related technology processes the outer circumferential surface of the pre-buried bolt sleeve (for example, increases the roughness, increases the cleanliness, and processes the groove), and the fiber bundle is wound. However, the result is not ideal, and the bolt sleeve and the fiber bundle are still pulled out as a whole.

[0067] Some embodiments of the present application provide a blade root pre-buried part, a blade root assembly with a pre-buried connection structure, and a blade, which can improve the connection strength of the blade root pre-buried part and the blade root.

[0068] Please refer to FIG. 1, which is a perspective structural schematic diagram of a blade root pre-buried part provided by some embodiments of the present application. Among them, the dashed line is only to better distinguish the first arc surface area 12 and the second arc surface area 11, and is not a solid structure.

[0069] In the first aspect, the blade root pre-buried part provided by some embodiments of the present application includes a sleeve body 1 and a pull-out part 2. On the sleeve body 1, a first arc surface area 12 and a second arc surface area 11 are arranged around the outer circumferential surface of the sleeve body 1, and the pull-out part 2 is arranged in the first arc surface area 12 of the sleeve body 1. The pull-out part 2 is formed by extending the outer circumferential surface of the sleeve body 1 away from the axis direction of the sleeve body 1.

[0070] The first arc surface area 12 and the second arc surface area 11 are set on the outer circumferential surface of the sleeve body 1 to clearly distinguish the distribution area of the pulling part 2, and the first arc surface area 12 and the second arc surface area 11 do not have actual structures to limit the junction. The sleeve body 1 can be circular, elliptical, polygonal or any other shape when the sleeve body 1 is cut along a plane perpendicular to the axis of the sleeve body 1. The sleeve is internally threaded for threaded connection with bolts, studs or the like.

[0071] The pulling part 2 protrudes from the outer circumferential surface of the sleeve body 1 on the outer circumferential surface of the sleeve body 1, and one end of the pulling part 2 is connected to the sleeve body 1 and the other end is a free end. Compared with the end connected to the sleeve body 1, the free end of the pulling part 2 is farther away from the axis of the sleeve body 1. When the pulling part 2 extends away from the axis of the sleeve body 1, the extension direction of the pulling part 2 can have any angle with the axis of the sleeve body 1, and the extension direction of the pulling part 2 can intersect or be coplanar with the axis of the sleeve body 1.

[0072] In the above structure, the pulling part 2 is located in the first arc surface area 12 of the outer circumferential surface of the sleeve body 1 and extends away from the axis of the sleeve body 1. The blade root embedded part is embedded in the embedded position in the blade root during use, and the pulling part 2 in the first arc surface area 12 can increase the contact area between the sleeve body 1 and the blade root, especially in the thickness direction of the blade root (the radial direction of the blade root), the pulling part 2 can penetrate into the blade root and be connected to the inner wall 3 and / or the outer wall 4 of the blade root, thereby improving the connection strength between the blade root embedded part and the blade root and improving the pulling performance of the blade root embedded part. Moreover, the second arc surface area 11 of the sleeve body 1 is not provided with the pulling part 2, which can avoid the corresponding area (such as the UD block area) in the blade root, thereby facilitating the installation and use of the blade root embedded part.

[0073] Please refer to FIG. 2, FIG. 3, FIG. 6 to FIG. 9, wherein FIG. 2 is a front structure schematic diagram of the blade root embedded part provided by some embodiments of the present application; FIG. 3 is a partial enlarged schematic diagram of A of FIG. 2; FIG. 6 is a front structure schematic diagram of the blade root embedded part provided by some other embodiments of the present application; FIG. 7 is a partial enlarged schematic diagram of C of FIG. 6; FIG. 8 is a side structure schematic diagram of the blade root embedded part provided by some embodiments of the present application; and FIG. 9 is a side structure schematic diagram of the blade root embedded part provided by some other embodiments of the present application. The dotted line represents the axis of the sleeve body 1, the center line of the sleeve body 1 and the extension direction of the pulling part 2, and the left side of the figure is the side of the penetrating bolt (or stud).

[0074] In some embodiments of the present application, the angle between the extension direction of the pulling portion 2 and the axis of the sleeve body 1 is R on the side where the sleeve body 1 penetrates the bolt, and R is in the range of 30° to 90°. For example, R can be 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, 70°, 75°, 80°, 85°, 90°, or any intermediate value between any two adjacent endpoint values.

[0075] In the above structure, the angle R is not an obtuse angle, and the pulling portion 2 can be better inserted into the blade root when subjected to pulling, and is not easy to slide out of the original position. The angle R is not an acute angle less than 30°, and the pulling portion 2 can be extended as much as possible from the outer peripheral surface of the sleeve body 1, increasing the contact of the blade root pre-embedded part with the blade root in the radial direction of the blade root pre-embedded part, and avoiding the blade root pre-embedded part from being pulled out together with the nearby blade root structure when subjected to pulling. As shown in FIGS. 6 and 7, when the angle R is an acute angle not less than 30°, the pulling portion 2 can be more tightly embedded in the blade root after being subjected to pulling.

[0076] As shown in FIGS. 2, 3, 8 and 9, in some embodiments of the present application, R is 90°.

[0077] When R is 90°, the axis of the sleeve body 1 and the extension direction of the pulling portion 2 are perpendicular. At this time, the axis of the sleeve body 1 and the extension direction of the pulling portion 2 can intersect, or be in different planes, or make part of the extension direction of the pulling portion 2 intersect with the axis of the sleeve body 1 and part of the extension direction of the pulling portion 2 be in different planes with the axis of the sleeve body 1.

[0078] When the blade root pre-embedded part is used, the wire harness can be wound around the outer peripheral surface of the sleeve body 1, and when R is 90°, the wire harness will not be hindered by the pulling portion 2, and the operation is more convenient.

[0079] As shown in FIGS. 1, 8 and 9, in some embodiments of the present application, the number of first arc surface areas 12 is two, which are symmetrically distributed on the sleeve body 1; the number of second arc surface areas 11 is two, which are symmetrically distributed on the sleeve body 1; the first arc surface area 12 is located between the second arc surface areas 11, and the area of the first arc surface area 12 is smaller than the area of the second arc surface area 11.

[0080] In the above structure, the included angle of the two first arc surface areas 12 is 180°, and the included angle of the two second arc surface areas 11 is 180°. The gripping and pulling parts 2 are distributed in the two first arc surface areas 12, and the two first arc surface areas 12 correspond to the outer wall 4 and the inner part of the blade root respectively when embedded. The two second arc surface areas 11 correspond to the filling blocks 7 in the blade root respectively, and the filling blocks 7 can be unidirectional blocks (UD blocks). The area of the first arc surface area 12 is smaller than that of the second arc surface area 11, which can avoid interference between the gripping and pulling parts 2 and the UD blocks, and facilitate the installation of the blade root embedded part during the embedding operation.

[0081] As shown in FIGS. 3, 7 and 8, in some embodiments of the present application, the straight line where the extension direction of the gripping and pulling part 2 is located intersects the axis of the sleeve body 1.

[0082] When the straight line where the extension direction of the gripping and pulling part 2 is located intersects the axis of the sleeve body 1, the straight line where the extension direction of the gripping and pulling part 2 is located can be perpendicular to the axis of the sleeve body 1 along the axial direction of the sleeve body 1 (as shown in FIG. 3), or the straight line where the extension direction of the gripping and pulling part 2 is located can form an acute angle of not less than 30° with the axis of the sleeve body 1 (as shown in FIG. 7).

[0083] When the straight line where the extension direction of the gripping and pulling part 2 is located intersects the axis of the sleeve body 1, the gripping and pulling parts 2 can be distributed along the radial direction of the sleeve body 1, which facilitates the forming and installation of the gripping and pulling parts 2.

[0084] As shown in FIG. 9, in some embodiments of the present application, the straight line where the extension direction of the gripping and pulling part 2 is located is non-coplanar with the axis of the sleeve body 1.

[0085] In the side structure schematic diagram of the blade root embedded part shown in FIG. 9, the straight lines where the extension directions of the left and right two gripping and pulling parts 2 among the three gripping and pulling parts 2 above the sleeve body 1 are located are non-coplanar with the axis of the sleeve body 1, and the straight lines where the extension directions of the left and right two gripping and pulling parts 2 among the three gripping and pulling parts 2 below the sleeve body 1 are located are also non-coplanar with the axis of the sleeve body 1, which can provide various schemes for the design form of the gripping and pulling parts 2 on the sleeve body 1.

[0086] As shown in FIG. 9, in some embodiments of the present application, part of the straight lines where the extension directions of the gripping and pulling parts 2 are located intersect the axis of the sleeve body 1, and part of the straight lines where the extension directions of the gripping and pulling parts 2 are located are non-coplanar with the axis of the sleeve body 1.

[0087] In the side structure schematic diagram of the blade root embedded part shown in FIG. 9, among the three gripping and pulling parts 2 above the sleeve body 1, the straight line where the extension direction of the middle gripping and pulling part 2 is located intersects the axis of the sleeve body 1; among the three gripping and pulling parts 2 below the sleeve body 1, the straight line where the extension direction of the middle gripping and pulling part 2 is located intersects the axis of the sleeve body 1. The straight lines where the extension directions of the remaining gripping and pulling parts 2 are located are non-coplanar with the axis of the sleeve body 1.

[0088] In the above structure, the line where the extension direction of the pulling part 2 is located is out of the plane of the axis of the sleeve body 1, and the line where the extension direction of the pulling part 2 is located intersects the axis of the sleeve body 1, which further expands the design idea of the pulling part 2.

[0089] As shown in FIG. 9, in some embodiments of the present application, the included angle between the plurality of pulling parts 2 in the same first arc surface area 12 is 0°; the included angle between the pulling parts 2 in the two first arc surface areas 12 is 180°.

[0090] In the same first arc surface area 12, all the pulling parts 2 are arranged in parallel, and the free end extension directions of any two different pulling parts 2 in different first arc surface areas 12 are opposite, with an included angle of 180°.

[0091] In the above structure, the plurality of pulling parts 2 in one first arc surface area 12 are arranged in parallel, which facilitates the placement on the lower layer of paving materials during pre-burial, and the plurality of pulling parts 2 in another first arc surface area 12 are arranged in parallel, which facilitates the paving of the upper layer of paving materials (the upper layer of paving materials and the lower layer of paving materials correspond to the inner wall 3 and the outer wall 4 of the blade root after forming). Since the lines where the extension directions of all the pulling parts 2 are located are parallel, during operation, the blade root pre-buried part and the upper layer of paving materials can be placed on the lower layer of paving materials in sequence, without the need to adjust the blade root pre-buried part to ensure that each pulling part 2 is inserted into the corresponding auxiliary material, which can greatly facilitate the operation of workers and save on-site operation time.

[0092] Please refer to FIG. 4 and FIG. 5, FIG. 4 is a front structure schematic diagram of the blade root pre-buried part provided by some other embodiments of the present application; and FIG. 5 is a partial enlarged schematic diagram of B of FIG. 4. Wherein L represents the distance between the free end of the pulling part 2 and the axis of the sleeve body 1.

[0093] In some embodiments of the present application, along the axis direction of the sleeve body 1, the outer peripheral surface of the sleeve body 1 includes alternating concave parts 14 and convex parts 13; in the first arc surface area 12, the pulling part 2 is located on the concave part 14 and / or the convex part 13.

[0094] As shown in FIG. 4 and FIG. 5, the pulling part 2 is distributed on both the concave part 14 and the convex part 13; as shown in FIG. 2 and FIG. 3, the pulling part 2 is only distributed on the convex part 13.

[0095] It is worth noting that the outer peripheral surface of the sleeve body 1 is a concave-convex surface with concave and convex parts alternating along the axis direction, and the concave-convex surface includes the concave part 14 and the convex part 13. The first arc surface area 12 and the second arc surface area 11 on the outer peripheral surface of the sleeve body 1 are the division of specific areas of the concave-convex surface. That is, the first arc surface area 12 is a concave-convex surface along the axis direction of the sleeve body 1, and the second arc surface area 11 is also a concave-convex surface along the axis direction of the sleeve body 1.

[0096] For the design of the concave-convex surface, along the axis of the sleeve body 1, the concave-convex surface can be wavy, jagged, etc., and the concave-convex surface can also be thread-like formed on the outer circumferential surface of the sleeve body 1 around the axis of the sleeve body 1. The concave-convex surface can be subjected to surface sand blasting treatment to improve roughness and cleanliness, thereby improving the connection strength during connection.

[0097] In the above structure, the concave-convex surface and the pull-out part 2 are provided on the outer circumferential surface of the sleeve body 1 at the same time, which not only can increase the contact area of the blade root pre-embedded part with the blade root during use, but also can make the pull-out part 2 inserted into the gap position of the blade root laying material (the laying material can be a woven structure, and there is a gap between the longitudinal and transverse interwoven woven lines), thereby improving the connection strength of the blade root pre-embedded part with the blade root without damaging the structure of the laying material, and improving the pull-out resistance of the blade root pre-embedded part.

[0098] As shown in FIGS. 2 and 3, in some embodiments of the present application, in the first arc surface area 12, the pull-out part 2 is located on the convex part 13.

[0099] In the above structure, in the two first arc surface areas 12, the pull-out part 2 is provided only on the convex part 13, and the concave part 14 is not provided with the pull-out part 2, which is beneficial to the subsequent fiber bundle winding step of the sleeve body 1, reduces the influence of the pull-out part 2 on the winding fiber bundle, and can avoid defects such as pouring cavity.

[0100] As shown in FIG. 5, in some embodiments of the present application, the distance between the free end of the pull-out part 2 located on the concave part 14 and the axis of the sleeve body 1 is a; the distance between the free end of the pull-out part 2 located on the convex part 13 and the axis of the sleeve body 1 is b; the value of a is not greater than the value of b.

[0101] When the pull-out part 2 is provided on the concave part 14 and the convex part 13, the value of the distance b between the free end of the pull-out part 2 located on the convex part 13 and the axis of the sleeve body 1 is greater than or equal to the value of the distance a between the free end of the pull-out part 2 located on the concave part 14 and the axis of the sleeve body 1.

[0102] When the value of a is less than the value of b, the pull-out part 2 located on the convex part 13 and the pull-out part 2 located on the concave part 14 can adopt the same specification (the same shape), thereby improving interchangeability.

[0103] When the value of a is equal to the value of b, that is, as shown in FIG. 5, the value of a and the value of b are both the length of L in the figure, the length of the pull-out part 2 located on the concave part 14 is greater than the length of the pull-out part 2 located on the convex part 13, and at this time, the risk of pouring cavity due to the different values of a and b can be avoided.

[0104] As shown in Fig. 5, in some embodiments of the present application, in order to ensure the quality of perfusion at the blade root, the corresponding pulling part 2 on the concave part 14 and the convex part 13 is designed to have a value of a equal to a value of b.

[0105] As shown in Fig. 1, in some embodiments of the present application, the pulling part 2 is in a columnar shape, and is located on the outer circumferential surface of the sleeve body 1, which can be formed integrally with the sleeve body 1, or can be detachably connected with the sleeve body 1, or can be partially formed integrally with the sleeve body 1 and partially detachably connected with the sleeve body 1.

[0106] When the pulling part 2 is formed integrally with the sleeve body 1, the pulling part 2 and the sleeve body 1 can be designed to be adhesively connected, or can be designed to be welded, or can be designed to be integrally formed by additive manufacturing technology (3D printing technology). When the pulling part 2 is detachably connected with the sleeve body 1, the pulling part 2 and the sleeve body 1 can be designed to be clamped, or can be designed to be threadedly connected.

[0107] The pulling part 2 is in a columnar shape, for example, can be in a cylindrical shape, an elliptical cylindrical shape, or a polygonal columnar shape. When the pulling part 2 is in a polygonal columnar shape, the cross section thereof can be a regular polygon, for example, a regular pentagon or a regular hexagon.

[0108] In some embodiments of the present application, in order to facilitate the installation of the pulling part 2 on the sleeve body 1, a hole is drilled on the outer circumferential surface of the sleeve body 1, and an internal thread is processed (the hole drilled cannot communicate with the threaded hole in the sleeve body 1), and an external thread is processed on the end of the pulling part 2 connected with the sleeve body 1, so that the pulling part 2 is fastened on the sleeve body 1 through the cooperation of the external thread and the internal thread, thereby achieving the detachable connection of the sleeve body 1 and the pulling part 2.

[0109] In the above structure, the detachable connection of the sleeve body 1 and the pulling part 2 is achieved through the threaded connection, which facilitates the installation and adjustment of the pulling part 2 on the sleeve body 1. In particular, when the radial direction of the sleeve body 1 coincides with the straight line in which the pulling part 2 extends, only the threaded hole needs to be processed along the radial direction of the sleeve body 1, which facilitates the processing of the threaded hole.

[0110] As shown in Figs. 8 and 9, in some embodiments of the present application, the cross-sectional area of the pulling part 2 gradually decreases along the extension direction of the pulling part 2.

[0111] The cross-sectional area of the pulling part 2 refers to the area of the cross section obtained by cutting the pulling part 2 along a plane perpendicular to the extension direction of the pulling part 2.

[0112] In the extending direction of the pulling part 2, the cross-sectional area of the pulling part 2 far from the sleeve body 1 is small, the cross-sectional area of the pulling part 2 close to the sleeve body 1 is large, and the cross-sectional area changes uniformly and continuously.

[0113] In the above structure, the end of the pulling part 2 close to the sleeve body 1 is relatively thick, which can effectively improve the connection strength of the pulling part 2 and the sleeve body 1; the end of the pulling part 2 far from the sleeve body 1 is relatively thin, which can be more easily inserted into the outer wall 4 and / or the inner wall 3 of the blade root.

[0114] In some embodiments of the present application, in order to facilitate the processing of the pulling part 2, the cross-sectional area of the pulling part 2 is constant in the extending direction of the pulling part 2. When the pulling part 2 is processed, the rod material can be cut into several segments to directly obtain the pulling part 2.

[0115] In some embodiments of the present application, the processing convenience of the pulling part 2 and the embedding convenience of the blade root embedded part can be considered together. Specifically, the pulling part 2 can be designed in two forms in combination, the cross-sectional area of a part of the pulling part 2 gradually decreases, and the cross-sectional area of another part of the pulling part 2 is constant in the extending direction of the pulling part 2.

[0116] In some embodiments of the present application, the pulling part 2 is provided with an outer convex segment at the end far from the sleeve body 1, and the outer convex segment can be hook-shaped.

[0117] In the extending direction of the pulling part 2, the pulling part 2 can be designed with a hook-shaped outer convex segment at the end where the free end is located. The hook shape can be a J-shaped hook, an L-shaped hook, or a T-shaped hook. For example, an arc-shaped bend can be provided to form a J-shaped arc-shaped bend as the outer convex segment; a vertical beam can be added on one side of the free end to form an L-shaped outer convex segment; and vertical beams can be added on both sides of the free end to form a T-shaped outer convex segment.

[0118] In the above structure, by providing the hook-shaped outer convex segment, the anti-peeling ability of the pulling part 2 and the connection strength with the blade root can be increased.

[0119] In some embodiments of the present application, the cross-sectional area of the outer convex segment is larger than that of the adjacent part of the pulling part 2.

[0120] In the extending direction of the pulling part 2, the pulling part 2 can be designed with a spherical or ellipsoidal shape with a variable cross-sectional area at the end where the free end is located to form an outer convex segment.

[0121] In the above structure, due to the increase in the cross-sectional area, the structural strength of the pulling part 2 is increased, and the connection strength of the pulling part 2 and the blade root is also increased.

[0122] In some embodiments of the present application, the outer convex section of the pulling portion 2 can also be designed in a hook shape, and the cross-sectional area of the outer convex section is increased in design, so that the cross-sectional area of the outer convex section is greater than the cross-sectional area of the adjacent portion of the pulling portion 2.

[0123] Please refer to FIGS. 10-12, FIG. 10 is a longitudinal sectional view of a blade root assembly with a pre-embedded connecting structure according to some embodiments of the present application; FIG. 11 is a partial enlarged view of FIG. 10 at D; and FIG. 12 is a transverse sectional view of a blade root assembly with a pre-embedded connecting structure according to some embodiments of the present application.

[0124] In a second aspect, some embodiments of the present application provide a blade root assembly with a pre-embedded connecting structure. The blade root assembly with the pre-embedded connecting structure includes a blade root body and a pre-embedded connecting structure. The blade root body includes an outer wall 4, an inner wall 3, and a filler layer filled between the outer wall 4 and the inner wall 3. The pre-embedded connecting structure includes a blade root pre-embedded part embedded in the filler layer; a sleeve body 1 of the blade root pre-embedded part is embedded in the filler layer, and a pulling portion 2 of the blade root pre-embedded part is inserted into the outer wall 4 and / or the inner wall 3.

[0125] The blade root body is formed by resin infusion, and the pre-embedded connecting structure is embedded between the outer wall 4 and the inner wall 3 before infusion. After infusion, the filler layer is infused between the outer wall 4 and the inner wall 3, and the outer wall 4, the filler layer, the inner wall 3, and the pre-embedded connecting structure are formed integrally. When the pre-embedded connecting structure is embedded, the free end of the pulling portion 2 of the blade root pre-embedded part is inserted into the outer wall 4 and / or the inner wall 3, realizing the connection between the blade root pre-embedded part and the outer wall 4 and / or the inner wall 3 after forming.

[0126] In the above structure, the pulling portion 2 is inserted into the woven gap position of the outer wall 4 and / or the inner wall 3, and only the fiber bundle of the fiber cloth is partially extruded away from the original position during the insertion process. After resin infusion and heating and curing, the pulling portion 2 is tightly combined with the outer wall 4 and / or the inner wall 3, and then the blade root pre-embedded part can directly interact with the outer wall 4 and / or the inner wall 3, which can improve the pull-out bearing capacity of the blade root pre-embedded part and enhance the overall connection strength of the blade root assembly, meeting higher blade root connection load requirements.

[0127] As shown in FIG. 10 and FIG. 12, in some embodiments of the present application, the thickness of the outer wall 4 is greater than the depth of the insertion of the pull-out portion 2 into the outer wall 4, and the difference (H) is in the range of 0.5mm to 3.5mm, for example, the difference can be 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, or any intermediate value between any two adjacent end values. The thickness of the inner wall 3 is greater than the depth of the insertion of the pull-out portion 2 into the inner wall 3, and the difference is in the range of 0.5mm to 3.5mm, for example, the difference can be 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, or any intermediate value between any two adjacent end values.

[0128] In the above structure, by setting the thickness of the outer wall 4 to be greater than the insertion depth of the pull-out portion 2, and the thickness of the inner wall 3 to be greater than the insertion depth of the pull-out portion 2, the pull-out portion 2 can be inserted into the inner wall 3 and / or the outer wall 4 without protruding from the surface of the inner wall 3 and / or the outer wall 4.

[0129] As shown in FIG. 12, in some embodiments of the present application, the difference between the thickness of the outer wall 4 and the depth of the insertion of the pull-out portion 2 into the outer wall 4 is 2mm; the difference between the thickness of the inner wall 3 and the depth of the insertion of the pull-out portion 2 into the inner wall 3 is 2mm.

[0130] In the above structure, by further limiting the difference, not only can the reliability of the connection between the blade root embedded part and the outer wall 4 and the inner wall 3 be ensured, but also the producer can control the production to avoid the generation of defective products.

[0131] As shown in FIG. 11, in some embodiments of the present application, the embedded connection structure further comprises a wrapping layer 6 wrapped on the outer circumferential surface of the sleeve body 1, and the thickness of the wrapping layer 6 is less than the protruding height of the pull-out portion 2 on the sleeve body 1.

[0132] In the above structure, the wrapping layer 6 can be a fiber bundle wrapping layer. When the outer circumferential surface of the sleeve body 1 is a concave-convex surface, by wrapping the wrapping layer 6 and then pouring resin, the contact area of the sleeve body 1 and the filler layer of the blade root body can be increased, and the pull-out bearing capacity of the sleeve body 1 can be improved.

[0133] As shown in FIG. 12, in some embodiments of the present application, the blade root body is circular, and the sleeve body 1 is multiple, and the multiple sleeve bodies 1 are distributed along the circumference of the filler layer, which can provide multiple connection positions of the outer hub in the circumferential direction of the blade root body, so that the blade root body is uniformly stressed when connected to the hub.

[0134] As shown in FIG. 12, in some embodiments of the present application, the embedded connection structure further comprises filler blocks 7, and the plurality of filler blocks 7 are distributed along the circumference of the filler layer. Each filler block 7 is located between two sleeve bodies 1 and is attached to the sleeve body 1. During embedding, the sleeve body 1 can be fixed in position using the filler block 7 to ensure the accuracy of the embedded position and the connection strength after forming. The filler block 7 can be a UD block.

[0135] As shown in FIG. 12, when the filler block 7 is attached to the sleeve body 1, there is one filler block 7 on each side of one sleeve body 1, and the upper side of the sleeve body 1 is the inner wall 3, and the lower side of the sleeve body 1 is the outer wall 4. The area where the sleeve body 1 is attached to the left filler block 7 is a second curved surface area 11, and the area where the sleeve body 1 is attached to the right filler block 7 is another second curved surface area 11. Between the two filler blocks 7, the sleeve body 1 faces the inner wall 3, which is a first curved surface area 12. Between the two filler blocks 7, the sleeve body 1 faces the outer wall 4, which is another first curved surface area 12.

[0136] As shown in FIG. 10, in some embodiments of the present application, the embedded connection structure further comprises a wedge-shaped block 5, which is inserted into the wedge-shaped area of the filler layer at one end and abuts one end of the sleeve body 1 at the other end, thereby providing positioning for the sleeve body 1 in the axial direction of the sleeve body 1. The wedge-shaped block 5 can be a foam wedge-shaped block 5.

[0137] As shown in FIG. 10, in some embodiments of the present application, at the abutting position of the wedge-shaped block 5 and the sleeve body 1, a sealing member is installed on the sleeve body 1. The sealing member includes a sealing plug and a sealing ring, and the sealing ring is located between the sealing plug and the sleeve body 1.

[0138] In the above structure, a sealing plug is provided between the wedge-shaped block 5 and the sleeve body 1, and the sealing plug can be threadedly connected to the sleeve body 1. A sealing ring is installed on the sealing plug, which can seal the gap between the sealing plug and the sleeve body 1, thereby preventing the inner cavity of the sleeve body 1 from being contaminated by resin during resin pouring.

[0139] Some embodiments of the present application also provide a production method of a blade root assembly with an embedded connection structure, comprising:

[0140] Assembling the sleeve body 1, the sealing ring, and the sealing plug to prevent the threaded part inside the sleeve body 1 from being infiltrated by resin during vacuum resin pouring;

[0141] Sandblasting the surface of the sleeve body 1 to improve the roughness and cleanliness of the outer peripheral surface;

[0142] Winding the fiber bundle on the outer peripheral surface of the sleeve body 1 so that the fiber bundle winding layer is tightly attached to the gripping and pulling part 2;

[0143] laying a lower composite fiber cloth layer of the blade root assembly;

[0144] Placing filler blocks 7 on the lower composite fiber cloth layer, and placing the sleeve body 1 between the two filler blocks 7, the first arc surface area 12 on the sleeve body 1 needs to be adjusted to the position of the gap between the two filler blocks 7, and the pulling part 2 is inserted into the lower composite fiber cloth layer, and only the fiber bundles in the lower composite fiber cloth layer are partially extruded from the original position during the insertion process;

[0145] Placing a wedge block 5 at the end of the sleeve body 1 to complete the arrangement of the embedded connection structure;

[0146] Laying an upper composite fiber cloth layer of the blade root assembly on the embedded connection structure, and similarly inserting the pulling part 2 into the upper composite fiber cloth layer, and only the fiber bundles in the upper composite fiber cloth layer are partially extruded from the original position during the insertion process;

[0147] Using the vacuum infusion method to inject resin and curing agent, and heating and curing to form a blade root assembly with an embedded connection structure.

[0148] In a third aspect, some embodiments of the present application also provide a blade comprising the blade root assembly with an embedded connection structure of any of the above embodiments.

[0149] The blade provided by the embodiments of the present application has all the beneficial effects of the blade root assembly with an embedded connection structure provided by the above embodiments of the present application, and specific descriptions can be referred to the specific description of the blade root assembly with an embedded connection structure in the above embodiments, which will not be repeated here.

[0150] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the above embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in the embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A blade root embedded part, comprising: a sleeve body, wherein a first curved surface area and a second curved surface area are arranged on an outer circumferential surface of the sleeve body; a gripping portion arranged in the first curved surface area of the sleeve body, wherein the gripping portion is formed by extending the outer circumferential surface of the sleeve body away from an axis direction of the sleeve body.

2. Blade root insert according to claim 1, wherein An angle between an extending direction of the gripping portion and the axis of the sleeve body is R at a side of the sleeve body where a bolt is inserted; R is in a range of 30° to 90°.

3. Blade root insert according to claim 2, wherein R is 90°.

4. Blade root insert according to any one of claims 1 to 3, wherein The number of the first curved surface areas is two, and the first curved surface areas are symmetrically distributed on the sleeve body; The number of the second curved surface areas is two, and the second curved surface areas are symmetrically distributed on the sleeve body; The first curved surface areas are located between the second curved surface areas, and an area of the first curved surface area is smaller than an area of the second curved surface area.

5. The blade root insert according to claim 4, wherein A straight line where the extending direction of the gripping portion is located intersects with the axis of the sleeve body; and / or The straight line where the extending direction of the gripping portion is located is not coplanar with the axis of the sleeve body.

6. Blade root insert according to claim 5, wherein An angle between the gripping portions in the same first curved surface area is 0°; An angle between the gripping portions in the two first curved surface areas is 180°.

7. Blade root insert according to any of claims 1 to 6, wherein Along the axis direction of the sleeve body, the outer circumferential surface of the sleeve body comprises concave portions and convex portions which are alternately distributed; In the first curved surface area, the gripping portion is located on the concave portion and / or the convex portion.

8. Blade root insert according to claim 7, wherein In the first curved surface area, the gripping portion is located on the convex portion.

9. The blade root insert according to claim 7, wherein A distance between a free end of the gripping portion located on the concave portion and the axis of the sleeve body is a; A distance between a free end of the gripping portion located on the convex portion and the axis of the sleeve body is b; The value of a is not greater than the value of b.

10. The blade root insert according to claim 9, wherein The value of a is equal to the value of b.

11. Blade root insert according to any of claims 1 to 10, wherein The gripping portion is in a columnar shape, and the sleeve body and the gripping portion are integrally formed and / or detachably connected.

12. Blade root insert according to any of claims 1 to 11, wherein Along the extending direction of the gripping portion, a cross-sectional area of the gripping portion gradually decreases; and / or Along the extending direction of the gripping portion, the cross-sectional area of the gripping portion is constant.

13. The blade root insert according to claim 12, wherein The sleeve body and the gripping portion are detachably connected through thread connection.

14. Blade root insert according to any of claims 1 to 13, wherein At an end away from the sleeve body, the gripping portion is provided with an outward convex segment; The outward convex segment is in a hook shape; and / or A cross-sectional area of the outward convex segment is greater than a cross-sectional area of an adjacent portion of the gripping portion.

15. The blade root insert according to claim 14, wherein The hook shape of the outward convex segment is any one of an L shape, a T shape and a J shape. 16.A blade root assembly with an embedded connection structure, comprising: a blade root body comprising an outer wall, an inner wall and a filler layer filled between the outer wall and the inner wall; an embedded connection structure comprising the blade root embedded part according to any one of claims 1 to 15 embedded in the filler layer; a sleeve body of the blade root embedded part is embedded into the filler layer, and a gripping portion of the blade root embedded part is inserted into the outer wall and / or the inner wall.

17. The bucket root assembly with pre-buried connection structure of claim 16, wherein, A thickness of the outer wall is greater than a depth of the gripping portion inserted into the outer wall, and a difference between the thickness and the depth is in a range of 0.5 mm to 3.5 mm. The thickness of the inner wall is greater than the depth of the pull-out portion inserted into the inner wall, and the difference between the two is in the range of 0.5mm to 3.5mm.

18. The bucket root assembly with pre-buried connection structure of claim 17, wherein, The difference between the thickness of the outer wall and the depth of the pull-out portion inserted into the outer wall is 2mm; the difference between the thickness of the inner wall and the depth of the pull-out portion inserted into the inner wall is 2mm.

19. A blade comprising a root assembly with a pre-buried connection structure according to any one of claims 16 to 18.

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