CN-122014492-A - Blade root assembly, blade and forming method of blade root assembly

CN122014492ACN 122014492 ACN122014492 ACN 122014492ACN-122014492-A

Abstract

The application discloses a blade root assembly, a blade and a forming method of the blade root assembly. The blade root assembly comprises a blade root body and an embedded connection structure, wherein the blade root body comprises an outer wall, an inner wall and a packing layer, the packing layer is filled between the inner wall and the outer wall, the embedded connection structure is embedded in the packing layer and comprises a sleeve and a winding layer arranged outside the sleeve, the winding layer comprises a first winding layer and a second winding layer, at least part of the first winding layer is positioned between the second winding layer and the sleeve, the second winding layer comprises first fibers, the included angle between the extending direction of the first fibers and the axial direction of the sleeve is smaller than 90 degrees, and the additional second winding layer is arranged outside the first winding layer to help to improve the structural strength of the winding layer in the drawing direction of the sleeve, reduce the rupture risk of the winding layer under the action of external force and strengthen the anti-poking bearing capacity of the embedded connection structure.

Inventors

ZHANG ZHEN
ZHANG YANMING
CHEN LIGUI
Zhang Chongbi

Assignees

中材科技风电叶片股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260227

Claims (12)

1. A blade root assembly, comprising: The blade root body comprises an outer wall, an inner wall and a packing layer, wherein the packing layer is filled between the inner wall and the outer wall; The embedded connecting structure is embedded in the filler layer and comprises a sleeve and a winding layer arranged outside the sleeve, the winding layer comprises a first winding layer and a second winding layer, at least part of the first winding layer is positioned between the second winding layer and the sleeve, the second winding layer comprises first fibers, and the included angle between the extending direction of the first fibers and the axial direction of the sleeve is smaller than 90 degrees.
2. The blade root assembly of claim 1, wherein the pre-buried connection structure further comprises a wedge block having a hardness less than that of the sleeve, the wedge block being connected to an end of the sleeve facing the blade tip, one end of the second wrap layer being connected to the sleeve, and the other end extending to the wedge block.
3. The blade root assembly of claim 2, wherein the wedge block has an outer diameter greater than an outer diameter of the sleeve, the second winding layer comprises first and second interconnected segments, the first segment disposed outside the sleeve, the second segment disposed outside the wedge block, and the second segment has a thickness less than a thickness of the first segment.
4. The blade root assembly of any of claims 1-3, wherein the second wrapping layer further comprises second fibers, the direction of extension of the second fibers intersecting the direction of extension of the first fibers, each of the first fibers being connected by the second fibers to form the fabric.
5. The blade root assembly of claim 4, wherein the pre-buried connection structure further comprises a fixed block, two fixed blocks are respectively arranged at two sides of the sleeve, at least part of the second winding layer is positioned between the fixed block and the sleeve, the outer surface of the second winding layer and the distance L1 between the second winding layer and the adjacent fixed block are met, and L1 is less than or equal to 1mm; and/or at least part of the second winding layer is positioned between the sleeve and at least one of the outer wall and the inner wall, the distance L2 between the outer surface of the second winding layer and the inner wall or the outer wall is satisfied, and L2 is less than or equal to 1mm.
6. The blade root assembly of claim 4, wherein the second wrap layer is disposed end-to-end around the sleeve.
7. The blade root assembly of claim 4, wherein the second winding layer comprises first and second interconnected segments, the second segment disposed at least one end of the first segment in the axial direction, the second segment having a thickness that decreases progressively in a direction away from the first segment.
8. The blade root assembly of claim 1, wherein the sleeve is provided with a groove on an outer circumferential surface thereof, the first winding layer is disposed in the groove, and a height difference h between a side of the first winding layer facing away from a bottom of the groove and a notch of the groove is less than or equal to 1mm.
9. The blade root assembly of claim 1, wherein at least a portion of the first fibers extend at an angle to the axial direction 1, The included angle between the extending direction of the fibers in the first winding layer and the axial direction 2, Satisfy 1< 2。
10. A blade comprising a blade root assembly according to any of the preceding claims 1-9.
11. A method of forming a blade root assembly according to any of claims 1 to 9, wherein the method comprises: Winding the first winding layer on the outer peripheral surface of the sleeve; the second winding layer is arranged on the outer side of the first winding layer and is fixed on the sleeve and/or the first winding layer to form an embedded connection structure, the second winding layer comprises first fibers, and an included angle between the extending direction of the first fibers and the axial direction of the sleeve is smaller than 90 degrees; the embedded connection structure is arranged between the outer wall and the inner wall of the blade root body; a medium is injected between the outer wall and the inner wall to form a fill layer.
12. The method of claim 11, wherein the second winding layer further comprises second fibers, the extending direction of the second fibers intersects the extending direction of the first fibers, each of the first fibers is connected by the second fibers to form a fabric, the second winding layer is disposed outside the first winding layer and is fixed to the sleeve and/or the first winding layer to form a pre-buried connection structure, and the forming comprises: The fabric is wound on the outer peripheral surface of the sleeve to form the second winding layer.

Description

Blade root assembly, blade and forming method of blade root assembly Technical Field The application belongs to the field of wind power, and particularly relates to a blade root assembly, a blade and a forming method of the blade root assembly. Background With the development of the wind power industry, the wind power blade is larger and larger in size, length and weight, so that the blade root connection load is correspondingly improved, and the connection strength of the wind power blade root and the hub is higher. Currently, the root connection is mainly in the form of a pre-buried connection. The failure of the embedded connection structure mainly comprises bolt fracture and embedded bolt sleeve pulling-out damage. In order to cope with the pulling-out damage of the embedded bolt sleeve, the related technology also provides some schemes, for example, in the patent application documents with publication number of CN115111249A, publication date of 2022, 9 months and 27 days, the invention and creation name of an embedded bolt sleeve and a wind driven generator, namely, the outer surface of the embedded bolt sleeve is modified, a plurality of groove areas with different depths are designed, the embedded bolt sleeve is wound on a glass fiber layer when in use, the publication number of CN114770984A, publication date of 2022, 7 months and 22 days, the invention and creation name of the bolt sleeve for wind power blade root connection and the embedded strength lifting method thereof are modified, the external threads of the bolt sleeve are also modified, a micro-groove structure is processed, and the grooves are filled with wire harness winding materials when in use. The above scheme is that the connection between the bolt sleeve and the winding wire harness is enhanced, but the self strength of the winding wire harness on the surface of the bolt sleeve is ignored, and the connection strength and reliability of the embedded connection structure are improved. Disclosure of Invention The application provides a blade root assembly, a blade and a forming method of the blade root assembly, which can improve the connection strength and reliability of a pre-buried connection structure. In a first aspect, the application provides a blade root assembly, comprising an outer wall, an inner wall and a filler layer, wherein the filler layer is filled between the inner wall and the outer wall, a pre-buried connection structure is buried in the filler layer, the pre-buried connection structure comprises a sleeve and a winding layer arranged outside the sleeve, the winding layer comprises a first winding layer and a second winding layer, at least part of the first winding layer is positioned between the second winding layer and the sleeve, the second winding layer comprises first fibers, and the included angle between the extending direction of the first fibers and the axial direction of the sleeve is smaller than 90 degrees. In some embodiments, the pre-buried connection structure further comprises a wedge block having a hardness less than that of the sleeve, the wedge block being connected to an end of the sleeve facing the blade tip, one end of the second winding layer being connected to the sleeve, and the other end thereof extending to the wedge block. In some embodiments, the wedge has an outer diameter greater than an outer diameter of the sleeve, the second winding layer includes first and second segments interconnected, the first segment disposed outside the sleeve, the second segment disposed outside the wedge, and the second segment having a thickness less than a thickness of the first segment. In some embodiments, the second wrap layer further comprises second fibers, the direction of extension of the second fibers intersecting the direction of extension of the first fibers, each first fiber being connected by the second fibers to form the fabric. In some embodiments, the embedded connection structure further comprises fixing blocks, wherein the two fixing blocks are respectively arranged on two sides of the sleeve, at least part of the second winding layer is arranged between the fixing blocks and the sleeve, the distance L1 between the outer surface of the second winding layer and the adjacent fixing blocks is smaller than or equal to 1mm, and/or at least part of the second winding layer is arranged between at least one of the outer wall and the inner wall and the sleeve, the distance L2 between the outer surface of the second winding layer and the inner wall or the outer wall is smaller than or equal to 1mm. In some embodiments, the second wrap layer is disposed end-to-end around the sleeve. In some embodiments, the second winding layer includes a first segment and a second segment connected to each other, the second segment being disposed at least one end of the first segment in the axial direction, the second segment gradually decreasing in thickness in a direction away from the first segment. In some embodi