CN217327544U - Leaf Root Prefabs and Blades - Google Patents

Abstract

The utility model provides a blade root prefabricated piece and a blade, the blade root prefabricated piece comprising: an annular main body including resin; a fiber layer arranged in the annular main body and laid along the annular main body, wherein the The fiber layers include glass fibers and carbon fibers. According to the blade root preform of the present invention, by making the fiber layer include both glass fibers and carbon fibers, the following technical effects can be simultaneously achieved: satisfying the strength requirements of the blade root preform, reducing the fracture risk of the blade root preform and reducing the manufacturing cost and weight.

Description

Leaf Root Prefabs and Blades

technical field

The utility model relates to the technical field of wind turbines, and more particularly, the utility model relates to a blade root prefabricated part and a blade.

Background technique

The quality of the blade is crucial to the reliability of the operation of the wind turbine, and the root area of the blade bears the load transmitted by the entire blade, so its reliability needs to be guaranteed.

At present, part of the fiber-reinforced fabric at the root of the blade is usually made into a blade root preform separately, and then the blade root preform is combined with other parts of the blade.

Therefore, it is necessary to ensure the reliability of the blade root preform and the reliability of other areas of the blade root.

Utility model content

The purpose of the present invention is to provide a blade root preform and a blade, the blade root preform can improve the blade root strength of the blade and reduce the fracture risk, manufacturing cost and weight of the blade root preform.

According to an aspect of the present invention, there is provided a blade root preform, the blade root preform comprising: an annular body including resin; a fiber layer disposed in the annular body and laid along the annular body, wherein , the fiber layer includes glass fiber and carbon fiber. According to the blade root preform of the present invention, by making the fiber layer include both glass fibers and carbon fibers, the following technical effects can be simultaneously achieved: satisfying the strength requirements of the blade root preform, reducing the fracture risk of the blade root preform and reducing the manufacturing cost and weight.

Optionally, the blade root preform includes a plurality of bolt sleeves arranged in the annular main body, the plurality of bolt sleeves are arranged in an annular shape around the axial direction of the annular main body, and each of the bolt sleeves extends from the annular main body. One side of the annular body extends toward the inside of the annular body.

Optionally, the fiber layer includes an inner fiber layer and an outer fiber layer, the inner fiber layer is arranged on the radial inner side of the plurality of bolt sleeves, and the outer fiber layer is arranged on the diameter of the plurality of bolt sleeves. to the outside.

Optionally, the inner fiber layer is glass fiber and the outer fiber layer is carbon fiber, or the inner fiber layer is carbon fiber and the outer fiber layer is glass fiber.

Optionally, both the inner fiber layer and the outer fiber layer include glass fibers and carbon fibers, and in each of the inner fiber layers and the outer fiber layers, glass fibers and carbon fibers are alternately arranged.

Optionally, the blade root preform further includes a bevel transition piece disposed in the annular body, the bevel transition piece being disposed at one end of the bolt sleeve, along the direction from the bolt sleeve to the The radial dimension of the bevel transition piece gradually decreases in the direction from the opposite end of the one end to the one end of the bolt sleeve. By setting the bevel transition piece, the thickness of the blade root preform can be smoothly transitioned.

Optionally, the blade root preform further includes a blocking piece, and the blocking piece is disposed between the one end of the bolt sleeve and the bevel transition piece. By providing the stopper, the resin can be prevented from pouring into the bolt sleeve when the resin is poured.

Optionally, the fiber layer includes an inner fiber layer and an outer fiber layer, the inner fiber layer is arranged on the radial inner side of the plurality of bolt sleeves and covers the bevel transition piece and the buffer piece, the An outer fiber layer is disposed radially outside the plurality of bolt sleeves and covers the bevel transition piece and the blocking piece.

Optionally, the blade root preform includes a plurality of first holes and a plurality of second holes disposed within the annular body, the plurality of first holes and the plurality of second holes surrounding the annular shape The axial direction of the main body is arranged in an annular shape, each of the first holes extends from one side of the annular main body toward the inside of the annular main body, and each of the second holes penetrates the annular main body along the thickness direction of the annular main body The main body is communicated with the corresponding first hole, and the blade root preform further includes a nut arranged in the second hole.

Optionally, in the thickness direction of the annular body, the glass fibers and the carbon fibers are arranged alternately or sequentially.

According to another aspect of the present invention, there is provided a blade comprising the blade root preform as described above.

Optionally, the blade may further include a main beam and a main beam underlay arranged on the outer side of the main beam and a main beam upper layer arranged on the inner side of the main beam, and the main beam underlay is and each of the spar overlays include carbon fibers and glass fibers disposed in sequence from the root of the blade toward the tip of the blade, the carbon fibers disposed from the root of the blade to the blade 1/4-1/3 of the length. With the above structure, the structural strength of the blade root section where the load is concentrated can be improved, and the weight and manufacturing cost of the entire blade can be reduced.

Optionally, in the span direction of the blade, the carbon fiber and the glass fiber are overlapped in a stepped manner. Excessive thickness in the overlapping area can be avoided by overlapping the carbon and glass fibers in a stepped fashion.

Description of drawings

The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description in conjunction with the accompanying drawings, wherein:

Fig. 1 is the schematic diagram of the embedded bolt sleeve type blade root prefabricated part according to the embodiment of the present utility model;

2 to 4 are schematic diagrams showing the arrangement of fiber layers according to an embodiment of the present invention;

5 is a schematic diagram of a perforated blade root preform according to an embodiment of the present invention;

6 is a schematic diagram of a blade according to an embodiment of the present invention.

In the drawings: 10 and 20 are the blade root preforms, 11 and 21 are the annular main body, 12 is the fiber layer, 12a is the inner fiber layer, 12b is the outer fiber layer, 13 is the bolt sleeve, 14 is the bevel transition piece, 15 is the group building, 22 is the first hole, 23 is the nut, 100 is the blade, 30 is the main beam, and 40 is the web.

Detailed ways

Hereinafter, with reference to FIGS. 1 to 4 , the embedded bolt sleeve type blade root preform according to the embodiment of the present invention will be described.

FIG. 1 is a schematic diagram of an embedded bolt-sleeve type blade root preform according to an embodiment of the present invention, and FIGS. 2 to 4 are schematic diagrams illustrating the arrangement of fiber layers according to an embodiment of the present invention.

As shown in FIGS. 1 to 4 , the blade root preform 10 according to the embodiment of the present invention may include: an annular body 11 including resin; a fiber layer 12 disposed in the annular body 11 and laid along the annular body 11 , The fiber layer 12 includes glass fiber and carbon fiber.

Since the blade root of the blade bears a large load, it is necessary to improve the strength of the blade root preform 10 . If all fiber layers are made of carbon fibers, on the one hand, the manufacturing cost is high, and on the other hand, the layer thickness of the blade root preform is insufficient, and the risk of breakage will increase. If the fiber layers are all made of glass fibers, the strength of the blade root preform will be insufficient, resulting in insufficient blade root strength of the blade.

According to the embodiment of the present invention, by making the fiber layer 12 include both glass fibers and carbon fibers, the following technical effects can be simultaneously achieved: satisfying the strength requirements of the blade root preform 10 , reducing the fracture risk of the blade root preform 10 , and reducing manufacturing cost and weight.

According to an embodiment of the present invention, the annular body 11 may include resin, and specifically, the annular body 11 may be formed by pouring resin after laying the fiber layer 12 . Although the annular body 11 shown in FIG. 1 is an annular whole, the present invention is not limited thereto, and the annular body 11 may be formed by splicing at least two arc segments. According to an embodiment of the present invention, the fiber layer 12 may be laid within the annular body 11 in a direction from the blade root to the blade tip, or may be laid along the circumference of the annular body 11 .

According to the embodiment of the present invention, when the prefabricated blade root is of the embedded bolt sleeve type, the prefabricated blade root 10 may further include a plurality of bolt sleeves 13 arranged in the annular main body 11 . As shown in FIG. 1 , a plurality of bolt sleeves 13 are arranged in an annular shape around the axial direction of the annular main body 11 , and each bolt sleeve 13 extends from one side of the annular main body 11 toward the inside of the annular main body 11 .

2 to 4 are diagrams schematically showing how the fiber layers 12 are laid with respect to the bolt sleeves 13 . As shown in FIGS. 2 to 4 , the fiber layer 12 may include an inner fiber layer 12 a provided on the radially inner side of the bolt sleeve 13 and an outer fiber layer 12 b provided on the radially outer side of the bolt sleeve 13 . The specific number of layers of the inner fiber layer 12a and the outer fiber layer 12b is not particularly limited, and can be determined according to the structural design.

As an example, as shown in FIG. 2 , the inner fiber layer 12a is glass fiber, and the outer fiber layer 12b is carbon fiber. When both the inner fiber layer 12a and the outer fiber layer 12b have multiple layers, each layer of the inner fiber layer 12a is glass fiber, and each layer of the outer fiber layer 12b is carbon fiber.

As another example, as shown in FIG. 3 , the inner fiber layer 12a is carbon fiber, and the outer fiber layer 12b is glass fiber. When both the inner fiber layer 12a and the outer fiber layer 12b have multiple layers, each layer of the inner fiber layer 12a is carbon fiber, and each layer of the outer fiber layer 12b is glass fiber.

As another example, as shown in FIG. 4 , both the inner fiber layer 12a and the outer fiber layer 12b include glass fibers and carbon fibers. According to an embodiment of the present invention, although not shown, in each of the inner fiber layer 12a and the outer fiber layer 12b, glass fibers and carbon fibers may be alternately arranged. "Alternating arrangement" refers not only to the case where glass fibers and carbon fibers are alternately arranged one by one, but also refers to the case where two (three or more) two (three or more) glass fibers and carbon fibers are alternately arranged.

According to an embodiment of the present invention, as shown in FIGS. 2 to 4 , the blade root preform 10 may further include a bevel transition piece 14 disposed in the annular body 11 . The beveled transition piece 14 is provided at one end of the bolt sleeve 13 , and the radial dimension of the beveled transition piece 14 gradually decreases in the direction from the other end of the bolt sleeve 13 (opposite one end thereof) to the one end of the bolt sleeve 13 . According to the embodiment of the present invention, by arranging the bevel transition piece 14, the thickness of the blade root preform 10 can be smoothly transitioned.

According to the embodiment of the present invention, the blade root preform may further include a blocking member 15, and the blocking member 15 is arranged between one end of the bolt sleeve 13 and the bevel transition piece 14, so as to prevent the resin from being poured into the bolt sleeve 13 when resin is poured. . As an example, the thickness (radial dimension) of the blocking member 15 may be equal to the radial dimension of the bolt sleeve 13 (diameter of a single bolt sleeve 13).

As an example, the blade root preform 10 may be manufactured by laying the outer fiber layer 12b, laying the bolt sleeves 13, the stopper 15 and the bevel transition piece 14, then laying the inner fiber layer 12a, and finally pouring resin and curing the resin to The blade root preform 10 is shaped.

What is described above is the prefabricated blade root preform 10 of the embedded bolt sleeve type. The prefabricated blade root part according to the embodiment of the present invention may also be a perforated type blade root prefabricated part.

5 is a schematic diagram of a perforated blade root preform according to an embodiment of the present invention.

As shown in FIG. 5 , the perforated blade root preform 20 may include: an annular body 21 including resin; a fiber layer (not shown) disposed in the annular body 21 and wound along the axis of the annular body 21 , wherein, The fiber layers include glass fibers and carbon fibers.

Similar to the annular body 11, the annular body 21 may also be formed by infusing resin after laying the fiber layer. Moreover, the annular body 21 can also be formed by splicing at least two arc segments.

According to the embodiment of the present invention, compared with the blade root preform 10 of the embedded bolt sleeve type, the perforated blade root preform 20 does not include the embedded bolt sleeve 13, but includes a plurality of first holes 22 and a plurality of a second hole.

The plurality of first holes 22 and the plurality of second holes are arranged annularly around the axial direction of the annular body 21 . Each first hole 22 extends from one side of the annular body 21 toward the inside of the annular body 21 , and each second hole penetrates through the annular body 21 along the thickness direction of the annular body 21 and communicates with the corresponding first hole 22 . Therefore, the first hole 22 and the second hole form an approximately T-shaped hole. The perforated blade root preform 20 may further include a nut 23 disposed in the second hole. When installing the blade provided with the perforated blade root preform 20 , the bolt can be inserted into the first hole 22 and screwed into the nut 23 .

In addition, the perforated blade root preform 20 according to the embodiment of the present invention also includes a fiber layer. Similar to the preformed blade root preform 10 of the embedded bolt sleeve type, the fiber layer of the perforated blade root preform 20 also includes both glass fibers and carbon fibers. As described above, by making the fiber layer include both glass fibers and carbon fibers, the following technical effects can be simultaneously achieved: meeting the strength requirements of the blade root preform 20, reducing the risk of breakage of the blade root preform 20, and reducing manufacturing cost and weight.

The fiber layers of the perforated blade root preform 20 are disposed within the annular body 21 and are wound along the axis of the annular body 21 . Optionally, in the thickness direction of the annular body 21 , glass fibers and carbon fibers are alternately arranged, or glass fibers and carbon fibers are arranged sequentially. "Alternating arrangement" refers not only to the case where glass fibers and carbon fibers are alternately arranged one by one, but also refers to the case where two (three or more) two (three or more) glass fibers and carbon fibers are alternately arranged. "Sequential arrangement of glass fibers and carbon fibers" means that from the outside of the annular body 21 to the inside of the annular body 21 , the glass fibers may be disposed first and then the carbon fibers, or the carbon fibers may be disposed first and then the glass fibers.

As an example, the perforated blade root preform 20 can be manufactured in the following manner: laying fiber layers in the manner of alternately laying glass fibers and carbon fibers or laying sequentially, and then pouring resin, and after the resin is cured, the annular body 21 is formed, and the annular body 21 is formed after the resin is cured. A first hole 22 and a second hole are opened on the top, and the nut 24 is arranged in the second hole.

The blade root preform according to the embodiment of the present invention can improve the blade root strength of the blade, reduce the fracture risk of the blade root preform, and reduce the manufacturing cost and weight.

FIG. 6 is a schematic diagram of a blade according to an embodiment of the present invention. Hereinafter, a blade according to an embodiment of the present invention will be described with reference to FIG. 6 .

As shown in FIG. 6 , a blade 100 according to an embodiment of the present invention may include a blade root preform 10 ( 20 ) as described above.

In addition, the blade 100 according to the embodiment of the present invention may further include a main beam 30 and a web 40 .

In addition, the blade 100 according to the embodiment of the present invention may further include a main spar underlay (not shown) disposed on the inner side of each of the two main beams 30 (the side close to the outside of the blade) and a main spar underlay (not shown) disposed in the A spar overlay (not shown) on the outer side (side close to the blade cavity) of each of the two spars 30 .

Each of the girder lower layup and the girder upper layup includes carbon fibers and glass fibers sequentially arranged in the spanwise direction of the blade 100 from the blade root of the blade 100 . That is, each of the girder lower layup and the girder upper layup includes carbon fibers disposed at the root section of the blade 100 and glass fibers disposed at the tip section of the blade 100 .

Through the above arrangement, the structural strength of the blade root section where the load is concentrated can be improved, and the overall weight and manufacturing cost of the blade 100 can be reduced. Specifically, when each of the girder lower layup and the girder upper layup contains only glass fibers, the structural strength of the blade root section may be insufficient and the overall weight of the blade may be excessive. The manufacturing cost of the blade is increased when each of the spar lower ply and the spar upper ply contains only carbon fibers.

According to an embodiment of the present invention, in each of the girder lower layup and the girder upper layup, carbon fibers are provided from the root of the blade 100 to 1/4-1/3 of the length of the blade 100, glass fibers It is overlapped with carbon fiber and arranged to the blade tip along the span direction of the blade 100 .

According to the embodiment of the present invention, in the span direction of the blade 100, the carbon fibers and glass fibers in the lower layer of the main beam and the upper layer of the main beam can be overlapped in a stepped shape. Excessive thickness in the overlapping area can be avoided by overlapping the carbon and glass fibers in a stepped fashion.

As described above, according to the blade root preform of the present invention, the following technical effects can be simultaneously achieved: meeting the strength requirements of the blade root preform, reducing the fracture risk of the blade root preform, and reducing the manufacturing cost and weight.

As described above, according to the blade of the present invention, the structural strength of the blade root section where the load is concentrated can be improved, and the weight and manufacturing cost of the entire blade can be reduced.

Although the exemplary embodiments of the present invention have been described in detail with reference to the exemplary embodiments thereof, it will be understood by those skilled in the art that, without departing from the spirit and scope of the present invention as defined by the claims, It undergoes various changes in form and detail.

Claims (13)

1. A blade root preform, characterized in that the blade root preform (10, 20) comprises: an annular body (11, 21), made of resin; a fibrous layer (12) disposed within and along said annular body (11, 21), Wherein, the fiber layer (12) includes a glass fiber layer and a carbon fiber layer. 2. The blade root preform according to claim 1, wherein the blade root preform (10) comprises a plurality of bolt sleeves (13) arranged in the annular body (11), the plurality of bolt sleeves (13) being arranged in the annular body (11) Bolt sleeves (13) are arranged in an annular shape around the axial direction of the annular body (11), each of the bolt sleeves (13) from one side of the annular body (11) toward the inside of the annular body (11) extend. 3. The blade root preform according to claim 2, wherein the fiber layer (12) comprises an inner fiber layer (12a) and an outer fiber layer (12b), and the inner fiber layer (12a) is arranged on the On the radially inner side of the plurality of bolt sleeves (13), the outer fiber layer (12b) is arranged on the radially outer side of the plurality of bolt sleeves (13). The blade root preform according to claim 3, wherein the inner fiber layer (12a) is a glass fiber layer, the outer fiber layer (12b) is a carbon fiber layer, or the inner fiber layer ( 12a) is a carbon fiber layer, and the outer fiber layer (12b) is a glass fiber layer. 5. The blade root preform according to claim 3, wherein the inner fiber layer (12a) and the outer fiber layer (12b) both comprise glass fiber layers and carbon fiber layers, and in the inner fiber layer In each of the layers (12a) and the outer fiber layers (12b), glass fiber layers and carbon fiber layers are alternately arranged. 6. The blade root preform according to claim 2, wherein the blade root preform (10) further comprises a bevel transition piece (14) arranged in the annular main body (11), the A bevel transition piece (14) is provided at one end of the bolt sleeve (13), from the other end of the bolt sleeve (13) opposite to the one end to the one end of the bolt sleeve (13) direction, the radial dimension of the bevel transition piece (14) gradually decreases. 7 . The blade root preform according to claim 6 , wherein the blade root preform ( 10 ) further comprises a blocking member ( 15 ), and the blocking member ( 15 ) is arranged on the bolt sleeve ( 13 ). 8 . ) and the bevel transition piece (14). 8. The blade root preform according to claim 7, wherein the fiber layer (12) comprises an inner fiber layer (12a) and an outer fiber layer (12b), and the inner fiber layer (12a) is arranged on the The radial inner side of the plurality of bolt sleeves (13) covers the bevel transition piece (14) and the blocking member (15), and the outer fiber layer (12b) is provided on the plurality of bolt sleeves. radially outside and covering the bevel transition piece (14) and the blocking piece (15). 9. The blade root preform according to claim 1, wherein the blade root preform (20) comprises a plurality of first holes (22) and a plurality of first holes (22) arranged in the annular body (21) Second holes, the plurality of first holes (22) and the plurality of second holes are arranged annularly around the axial direction of the annular body (21), each of the first holes (22) extending from the One side of the annular main body (21) extends toward the inside of the annular main body (21), and each of the second holes penetrates the annular main body (21) along the thickness direction of the annular main body (21), and is connected to the corresponding annular main body (21). The first hole (22) communicates with each other, and the blade root preform (20) further includes a nut (23) arranged in the second hole. 10. The blade root preform according to claim 9, characterized in that, in the thickness direction of the annular body (21), the glass fiber layers and the carbon fiber layers are arranged alternately or sequentially. 11. A blade, characterized in that the blade comprises the blade root preform according to any one of claims 1-10. 12. The blade according to claim 11, characterized in that, the blade (100) further comprises a main beam (30) and a main beam underlay disposed on the outer side of the main beam (30) and a main beam underlay disposed on the main beam (30). The girder upper layup on the inner side of the girder (30), the girder lower layup and the girder upper layup each include a direction from the blade root of the blade (100) toward the blade (100). 100) a carbon fiber layer and a glass fiber layer arranged in sequence at the blade tip, the carbon fiber layer is arranged from the blade root of the blade (100) to 1/4-1/3 of the length of the blade (100). 13. The blade of claim 12, wherein the carbon fibres in each of the main spar underlay and the main spar upper ply in the span direction of the blade (100) The layer and the glass fiber layer are overlapped in a stepped shape.

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