CN115163395B

CN115163395B - Wind power blade girder segment, girder and wind power blade

Info

Publication number: CN115163395B
Application number: CN202210787787.5A
Authority: CN
Inventors: 谈源; 汤娟; 陈浩; 盛广智
Original assignee: Changzhou New Intelligent Technology Co Ltd
Current assignee: Changzhou New Intelligent Technology Co Ltd
Priority date: 2022-07-04
Filing date: 2022-07-04
Publication date: 2023-07-14
Anticipated expiration: 2042-07-04
Also published as: CN115163395A

Abstract

The invention relates to the technical field of wind power blades, in particular to a wind power blade girder segment, which comprises: the curved plate body with the uniform section forms at least one arch structure, and the length direction of the arch structure is arranged along the length direction of the wind power blade; the filling structure is attached to one side of the concave part of the arch structure and at least partially fills the concave part; wherein the filling structure is a hollow structure. The invention provides the girder segment which can effectively reduce the consumption of the carbon fiber material, and the arch structure in the segment can improve the mechanical property relative to the planar plate body and properly reduce the thickness of the plate body; the arrangement of the filling structure strengthens the structure of the curved plate body, and the arrangement position of the filling structure utilizes the concave side of the arch structure, so that the finally obtained main girder segment has compact structure, and more importantly, the arrangement of the filling structure with a hollow structure also reduces the material consumption. The invention also discloses a wind power blade girder and a wind power blade.

Description

Wind power blade girder segment, girder and wind power blade

Technical Field

The invention relates to the technical field of wind power blades, in particular to a wind power blade girder segment, a girder and a wind power blade.

Background

Wind power blades are typically contoured from a shell, with the interior being carried using a spar-web structure, with spar and web reinforcing structures being important structures in the blade members.

At present, a main beam structure is mostly in a trapezoid cross section form and is obtained by stacking multiple layers of carbon fiber plates with different widths, so that the required mechanical properties are achieved; the carbon fiber plate body is obtained through pultrusion, mass production is convenient, and the production efficiency of the wind power blade can be improved to a certain extent.

However, the main beams in the structural form are stacked by solid materials, so that the consumption of carbon fibers is inevitably increased, and the cost of the wind power blade is increased.

On the basis of ensuring the mechanical property and the production efficiency of the product, the consumption of carbon fibers is reduced, and the cost is one of the directions studied in the design process of the current wind power blade.

Disclosure of Invention

The invention provides a wind power blade girder segment, a girder and a wind power blade, which effectively solve the problems pointed out in the background technology.

In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:

a wind power blade girder segment fixedly connected with a wind power blade shell, comprising:

the wind power blade comprises a curved plate body of carbon fiber with a uniform cross section, wherein the curved plate body forms at least one arch structure, and the length direction of the arch structure is arranged along the length direction of the wind power blade;

the filling structure is attached to one side of the concave of the arch structure and at least partially fills the concave;

wherein the filling structure is a hollow structure.

Further, the filling structure is a structure body of carbon fibers with uniform cross sections, the structure body is arranged along the length direction of the wind power blade, and at least one through cavity is arranged along the length direction of the structure body.

Further, the structure is attached to the curved plate body through surface and/or line.

Further, each arch structure is provided with one corresponding structure body.

Further, the structure body is provided with at least two through cavities along the length direction, and a reinforcing rib body is formed between two adjacent through cavities, and the direction of the reinforcing rib body is arranged along the depth direction of the recess.

Further, at least two structures are correspondingly arranged on each arch structure.

Further, two adjacent structures are attached through a surface and/or a line.

Further, the outer profile section of each structural body is circular, and two adjacent structural bodies are bonded through a line.

Further, the outer profile section of the structural body is polygonal, and two adjacent structural bodies are bonded through a surface.

Further, two adjacent structural bodies are attached through a plane, and the extending direction of the plane is the depth direction of the recess.

Further, the structural body comprises a first structural body with a circular outline section and a second structural body with a polygonal shape;

wherein the bonding between the first structures is wire bonding; the bonding between the second structures is surface bonding; the bonding between the first structure body and the second structure body is wire bonding.

Further, each of the second structures is connected to at least two of the first structures.

Further, the whole body after the connection of the second structural body is connected with the curved plate body, and a space for accommodating each first structural body is formed between the whole body and the curved plate body.

Further, the wall thickness of the structure body is equal throughout.

Further, all the structures have a fitting position with the curved plate body.

Further, a part of the structure body has a fitting position with the curved plate body.

Further, the curved plate body is a corrugated plate, and the filling structure is filled in the concave parts at two sides of the curved plate body.

Further, the curved plate body is formed by stacking a plurality of layers.

Further, the adjacent two layers of curved plate bodies are attached to each other, an annular closed area is formed between the adjacent two layers of curved plate bodies, and the filling structure is filled in the closed area.

Further, the two adjacent layers of the curved plate bodies are arranged at intervals, and the filling structure is arranged between the two adjacent layers of the curved plate bodies.

Further, the filling structure is a 3D stereoscopic fabric.

Further, the through cavity is obtained by butt joint of at least two parts of the structure body in a cross-sectional direction.

Further, the butt joint between two adjacent parts of the structure body is overlapped in a staggered manner.

Further, the butt joint between two adjacent parts of the structure body is connected through cladding from one side to the other side.

Further, the abutting positions of the respective portions of the structure are located on the side walls extending in the depth direction of the recess.

Further, the thickness of the curved plate body at the bottom of the recess is greater than the thickness of the two sides.

The wind power blade girder adopts at least two sections of wind power blade girder sections as described above, and between each wind power blade girder section, the connection position of the curved plate body and the filling structure is arranged in a staggered manner in the length direction of the wind power blade.

Further, the filling structures and/or the curved plate bodies are connected through additional connecting structures.

Further, the filling structures are connected by inserting one section into the hollow area of the other section.

A wind power blade adopts the wind power blade girder.

By the technical scheme of the invention, the following technical effects can be realized:

the invention provides the girder segment which can effectively reduce the consumption of the carbon fiber material, and the arch structure in the segment can improve the mechanical property relative to the planar plate body and properly reduce the thickness of the plate body; the arrangement of the filling structure strengthens the structure of the curved plate body, and the arrangement position of the filling structure utilizes the concave side of the arch structure, so that the finally obtained main girder segment has compact structure, and more importantly, the arrangement of the filling structure with a hollow structure also reduces the material consumption. The invention also discloses a wind power blade girder and a wind power blade.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings may be obtained according to the drawings without inventive effort to those skilled in the art.

FIG. 1 is a first cross-sectional schematic view of a wind power blade spar segment and a process of assembling the same;

FIG. 2 is a second cross-sectional schematic view of a wind blade spar segment and a process of assembling the same;

FIG. 3 is a third cross-sectional schematic view of a wind blade spar segment and a process of assembling the same;

FIGS. 4 and 5 are schematic views of two arrangements of the stiffener in a main spar segment of a wind turbine blade (fourth and fifth cross-sectional views are shown, respectively);

FIG. 6 is a sixth cross-sectional schematic view of a wind blade spar segment and a process of assembling the same;

FIG. 7 is a schematic view of a polygonal outer profile cross-section of a structure;

fig. 8 and 9 are schematic views of two part structures having a position of engagement with a curved plate body, respectively (seventh and eighth cross-sectional schematic views are shown, respectively);

FIG. 10 is a ninth cross-sectional schematic view of a wind power blade spar segment and a process of assembling the same;

FIG. 11 is a tenth cross-sectional schematic view of a wind blade spar segment and a process of assembling the same;

FIG. 12 is a schematic view showing the bonding arrangement between two adjacent layers of curved plate bodies, and the annular closed region is formed between the two adjacent layers of curved plate bodies;

FIG. 13 is a schematic view of a 3D fabric filled with structure;

FIGS. 14-16 are schematic views showing three structures respectively in a cross-sectional direction, wherein the three structures are butted by at least two parts to obtain a through cavity;

FIG. 17 is a schematic view of a process of obtaining a through cavity by butting two parts of a structure in a cross-sectional direction;

FIG. 18 is a partial elevation view of a wind blade spar;

FIG. 19 is a schematic view of a first configuration and arrangement of a connection structure;

FIG. 20 is a schematic view of a second configuration and arrangement of a connecting structure;

FIG. 21 is an exploded view of a first segment structure relative to a second segment structure;

reference numerals: 1. a curved plate body; 11. a recess; 2. a structure; 21. a through cavity; 22. a reinforcing rib body; 23. a curved edge; 24. a straight line edge; 25. bending angles; 26. a bonding portion; 27. a sidewall; 201. a first structure; 202. a second structure; 203. a first segment structure; 204. a second segment structure; 3. a space; 4. 3D fabric; 5. a first segment; 6. a second segment; 71. a first connection location; 72. a second connection location; 8. and a connection structure.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

A wind power blade girder segment fixedly connected with a wind power blade shell, comprising: the wind power blade comprises a curved plate body 1 of carbon fiber with a uniform cross section, wherein the curved plate body 1 forms at least one arch structure, and the length direction of the arch structure is arranged along the length direction of the wind power blade; the filling structure is attached to one side of the concave 11 of the arch structure and at least partially fills the concave 11; wherein the filling structure is a hollow structure.

The invention provides a girder section capable of effectively reducing the consumption of carbon fiber materials, wherein in the section, a curved plate body 1 is a solid plate body, the mechanical property of the girder section is improved relative to a plane plate body through an arch structure, and the thickness of the plate body can be properly reduced through the improvement of the structure; the arrangement of the filling structure structurally strengthens the curved plate body 1, and the arrangement position of the filling structure utilizes one side of the concave 11 of the arch structure, so that the finally obtained main girder segment has a compact structure, and more importantly, the arrangement of the filling structure with a hollow structure also reduces the material consumption.

According to the invention, the curved plate body 1 can be produced and processed through a pultrusion process, and the wind power blade product with reduced cost can be obtained by reducing the consumption of carbon fibers on the basis of ensuring the mechanical property and the production efficiency of the product through the technical scheme of the invention.

As a preferable example of the above embodiment, the structure 2 is a structure 2 filled with carbon fibers having a uniform cross section, the structure 2 is provided along the length direction of the wind power blade, and the structure 2 is provided with at least one through cavity 21 along the length direction; the arrangement of the structure 2 through the cavity 21 also reduces the amount of carbon fibres used.

Wherein the structure 2 is bonded to the curved plate 1 through a surface and/or a line. As shown in fig. 1, there is shown a manner in which the structural body 2 is bonded to the curved plate body 1 by a face, that is, a follow-up curved surface portion having the same curvature as that of the concave 11 side of the curved plate body 1 is provided on the outer surface of the structural body 2, thereby increasing the bonding area with the curved plate body 1; in the wire bonding method, it is difficult to obtain a stable connection between the structure 2 and the curved plate 1 by only one bonding wire, but the following method is required:

(1) The bonding position adopts a mode of combining a plurality of lines, as shown in fig. 2, and the pointed position A is the position of line bonding;

(2) The bonding position adopts a mode of combining a line and a surface, as shown in fig. 3, the pointed position A is a position of line bonding, and the pointed position B is a position of surface bonding;

in the combination mode, the combination of the wires and the surfaces may be from different structures 2 or from the same structure 2.

For the correspondence of the arch structure and the structure 2, comprising: each arch structure is correspondingly provided with a structural body 2, and referring to fig. 1, the mode is obviously the simplest for processing the wind power blade main beam, the number of positions needing to be matched among different structures is small, and the difficulty of combining the curved plate body 1 and the structural body 2 into a whole can be effectively reduced. In this way, preferably, the structure 2 is provided with at least two through cavities 21 in the longitudinal direction, and the reinforcing rib 22 is formed between two adjacent through cavities 21, and the direction of the reinforcing rib 22 is set in the depth direction of the recess 11. As shown in fig. 4, a structural form of the reinforcing rib body 22 is illustrated, the reinforcing rib body 22 is preferably processed synchronously in the process of carrying out pultrusion on the structural body 2, the arrangement of which is beneficial to the improvement of the mechanical property of the arch structure, and in the case of only one structural body 2, the proportion of the cross section of the through cavity 21 to the total cross section area of the structural body 2 can be further improved by the arrangement of the reinforcing rib body 22, so that the material consumption is further reduced.

Of course, the case of one rib 22 as shown in fig. 4 is optimal in consideration of the cost and the processing difficulty, and the adjustment of mechanical properties can be achieved by the adjustment of the thickness of the periphery of the structure body 2 and the thickness of the rib 22, but the case of providing a plurality of ribs 22 is also within the scope of the present invention, and the case of two ribs 22 as shown in fig. 5, in which case it is preferable that the distribution of the ribs 22 in the wind blade width direction is symmetrical.

Or, at least two structures 2 are correspondingly arranged on each arch structure; as shown in fig. 2, 3 and 6, a structure following the curved plate body 1 is obtained by the combined use of a plurality of structural bodies 2.

Wherein, two adjacent structures 2 are jointed through surfaces and/or wires; in this way, the specific fitting manner depends on the peripheral outline shape of each structure 2.

As a specific embodiment, the outer profile section of the structural body 2 is circular, and two adjacent structural bodies 2 are bonded by a line. As shown in fig. 2, the outer profile sections of the structures 2 are all in a circular form, the bonding between two adjacent structures 2 is wire bonding, and in order to adapt to different positions of the curved plate body 1, the adopted structures 2 can have different outer diameters; in this embodiment, too, the structure 2 and the curved plate 1 are bonded by a wire.

In this way, the structure 2 is preferably a hollow tube of uniform wall thickness, which is advantageous for quality control during and during machining. Of course, in the above-described mode, only one cross-sectional shape of the structure body 2 is shown, and the cross-section of the structure body 2 is more selected according to the shape of the curved plate body 1, which is within the scope of the present invention.

As another preferable mode, the outer contour section of the structural body 2 is polygonal, and two adjacent structural bodies 2 are bonded by a surface. As shown in fig. 6, there are three structures 2, two of which have three-sided outer profile sections, and one of which has a four-sided outer profile section, wherein the number of sides of the middle polygon of the profile is not taken as a basis for limiting the scope of the present invention, and any polygonal form capable of achieving the technical purpose of the present invention, including pentagons, hexagons, etc., is within the scope of the present invention.

It should be noted that, in order to adapt to the shape of the curved plate body 1, the surface where the structural body 2 is attached to the curved plate body 1 may be configured to be curved in accordance with the contour of the curved plate body 1, that is, the corresponding side in the cross section of the outer contour may be curved or straight, such as the curved side 23 and the straight side 24 shown in fig. 7; of course, the shape of one side of the concave 11 of the curved plate body 1 can be changed to adapt to the surface of the structural member, and the two parts can be well attached only by ensuring that the two parts are well attached, and the attached purpose is to improve the mechanical property of the wind power blade through the improvement of the integrity. In the process of shaping the polygon, in order to ensure the shaping effect, a corner 25 is provided between the different sides, thereby avoiding the occurrence of shaping defects.

In order to improve the strength, the adjacent two structures 2 are bonded by a plane, and the extending direction of the plane is the depth direction of the recess 11, so that the reinforcing rib 22 equivalent to the above embodiment can be formed by the bonding portions 26 of the two structures 2 as shown in fig. 6, thereby achieving a better effect of supporting the curved plate 1.

When the structures 2 of a plurality of sectional forms are combined, it is preferable that the structures 2 include a first structure 201 whose outer contour section is circular, and a second structure 202 which is polygonal; wherein the bonding between the first structures 201 is wire bonding; the bonding between the second structures 202 is surface bonding; the bonding between the first structure 201 and the second structure 202 is wire bonding.

Referring to fig. 3, this is shown for a combination of the two cases, wherein the position of wire bonding is more convenient to adjust than the position of surface bonding, and the combination of the two is very advantageous for the integral forming process of the girder segments, while as another aspect, it is preferable that each second structure 202 is connected with at least two first structures 201, so that the integrity between the first structures 201 can be effectively increased through the second structures 202, the problem that the connection position is weaker due to wire bonding is avoided, and after the stable connection relationship is obtained between the different second structures 202 through surface bonding, a stable filling structure for better supporting the curved panel 1 can be obtained through the connection between the first structures 201.

In order to further increase the integrity of the whole segment, as a more preferable mode, the whole body after the connection of the second structural body 202 is connected with the curved plate body 1, and a space 3 for accommodating each first structural body 201 is formed between the second structural body and the curved plate body 1; the position B shown in fig. 3 is a connection position between the whole body connected with the second structural body 202 and the curved plate body 1, and the other first structural bodies 201 are disposed in the space 3 between the whole body and the curved plate body 1.

As a preferable example of the above embodiment, the wall thickness of the structure 2 is equal throughout, so that the material control is easier to be performed and the uniformity of the resin distribution throughout the process of obtaining the structure 2 by the pultrusion of the yarn or the fabric is ensured.

For the arrangement of the structures 2, all the structures 2 have the fitting positions with the curved plate body 1; this is illustrated in fig. 2, where the structures 2 are hollow tubes in the above embodiment, and each structure 2 forms a single layer distribution when they are bonded to the curved plate 1; alternatively, the partial structure 2 has a bonding position with the curved plate 1; as shown in fig. 8 and 9, two cases are shown, in which the top layer of the structure 2 is attached to the curved plate 1, and the bottom layer of the structure 2 is attached only to the top layer of the structure 2, and is not directly attached to the curved plate 1.

The optimization for the curved plate body 1 can be specifically: the curved plate body 1 is a corrugated plate, and the filling structure is filled in the concave 11 at two sides of the curved plate body 1. This is illustrated in fig. 10, which shows an example of a structure body 2 with a carbon fiber filling structure, wherein the structural reinforcement effect obtained by the corrugated form of the curved plate body 1 is more pronounced, whereas the filling of the recesses 11 by different structure bodies 2 on different sides results in a better effect of the main beam segments.

In the present preferred embodiment, the selection of the cross section of the structure 2 and the bonding relationship between the different structures are described in the above embodiments, and will not be described here again. However, when a relatively large number of arch structures are used in the same space 3 in terms of cross-sectional dimensions, a correspondingly large number of structures 2 are used, and therefore the cross-sectional dimensions of each structure 2 can be appropriately reduced.

In the above-mentioned plate body form, the curved plate body 1 may be provided with several layers stacked. As shown in fig. 11, there is shown one of the stacked forms, and as such, the filling structure shown in the figure is a carbon fiber structure 2. In this form, the two adjacent layers of curved plate bodies 1 are attached to each other, an annular closed area is formed between the two adjacent layers of curved plate bodies 1, the filling structure is filled in the closed area, and the stacked corrugated plates of each layer are connected to form a skeleton form as shown in fig. 12, wherein the skeleton form obtains stronger mechanical properties of the corrugated plates, and better girder strength is obtained through the mutual connection and further integrity.

Or, there is another implementation mode in the form of stacking, the two adjacent layers of curved plate bodies 1 are arranged at intervals, and the filling structure is arranged between the two adjacent layers of curved plate bodies 1; as shown in fig. 13, one of the two layers of curved plate bodies 1 is shown in a spaced arrangement mode, and the two layers of curved plate bodies 1 can be arranged in parallel, or a certain curvature difference exists, but only the non-fitting position is satisfied.

In the present invention, the filling structure may also be a 3D three-dimensional fabric 4, see also fig. 13, in which the area between two adjacent layers of curved plate bodies 1 is filled with the 3D three-dimensional fabric 4, which is a hollow structure obtained by internal gaps, and has a lighter weight, but can effectively fill between two adjacent layers of plate bodies, and the 3D three-dimensional fabric 4 itself has a higher strength, and can be used in cooperation with the curved plate bodies 1 to obtain a main girder segment meeting the use requirement.

As a preferable mode of the structure body 2, the structure body 2 obtains a through cavity 21 by butt joint of at least two parts in a cross-sectional direction; thus, a different overall form of construction can be obtained by adjustment of any of the parts thereof, and in this way, the abutting joint between two adjacent parts of the structure 2 is in offset overlapping engagement, as in both cases shown in figures 14 and 15, the two parts being shown with a suitably reduced edge thickness in figure 14, so that a flat surface form is obtained at the engagement, whereas the two parts being shown with an edge being directly engaged in figure 15, so that a form of engagement of double thickness is obtained at the engagement position, in which form a greater strength is obtained than at the other positions. Or, the butt joint between two adjacent parts of the structural body 2 is connected through the cladding from one side to the other side, and the connecting mode can appropriately increase the processing difficulty for processing, but the local structure is appropriately reinforced through the cladding mode, so that a more stable connecting position is formed, wherein the part, which is positioned on the outer part of the wind power blade, is preferably clad on the part, which is positioned on the inner part of the wind power blade.

As a further preferable mode, the abutting positions of the respective portions of the structure 2 are located on the side wall 27 extending in the depth direction of the recess 11. In this way, as shown in fig. 17, by adjusting the height of the side wall 27 provided with the connection in the figure, the effect of controlling the shape of the outer surface of each part can be achieved; in addition, when the reinforcing ribs are provided, the reinforcing ribs may be provided on a part thereof.

As an optimization mode, the structural body 2 is divided into two parts, so that the butt joint of the parts is easier while the structural control of the parts is facilitated, and the processing difficulty is avoided from being greatly improved. Wherein, in order to promote the integrity, the thickness of the curved plate body 1 at the bottom of the recess 11 is greater than that of the two sides, as in the case illustrated in fig. 6, 8 and 9, a better fit with the filling structure can be achieved, and also a reinforcement of the partial structure can be obtained.

A wind power blade girder adopts at least two sections of wind power blade girder sections as described above, and the connecting positions of a curved plate body 1 and a filling structure between each wind power blade girder section are arranged in a staggered manner in the length direction of a wind power blade. As illustrated in fig. 18, the first connection point 71 between the curved plate body 1 and the second connection point 72 between the filling structure in the first section 5 and the second section 6 are offset.

Wherein the connection between the filling structures and/or between the curved panel bodies 1 is achieved by means of additional connection structures 8. Taking the structure body 2 using carbon fiber as an example of the filling structure shown in fig. 1, the connecting structure 8 may be selected to have a plate structure in cross section, and after the adjacent two filling structures are butted, the joint between the two structure bodies 2 is connected internally or externally, as shown in fig. 19. Of course, the plate structure as the connecting structure 8 is only a low-cost embodiment; in order to further increase the connection strength of the connection location, the cross-sectional area of the connection structure 8 can be increased as much as possible, as shown in fig. 20, which shows a connection structure 8 with a more complex structure, the connection structure 8 is disposed in the hollow area of the filling structure, and in this embodiment, the connection structure 8 is disposed in the through cavity 21 of the structure body 2, and the connection function is realized and the structure reinforcing function of the reinforcing ribs is realized by supporting the through cavity 21 at different locations. When the number of through cavities 21 of the structure 2 is large, the connection structure 8 may be provided only in part of the through cavities 21.

When the filling structure is the carbon fiber structure body 2, the connecting structure 8 is preferable to connect the structure body 2, and the connection between the curved plate bodies 1 is realized by proper treatment of the joint after butt joint, so that on one hand, the processing difficulty of the main beam is reduced, and on the other hand, the sufficient connection strength can be satisfied.

As another embodiment, the connection between the filling structures is achieved by inserting one section into the hollow area of the other section. This is particularly suitable in the form of a structure 2 with a carbon fibre filling structure, the cross-sectional dimensions of the structure 2 being easily controlled, so that a good fit of the structure 2 between different segments can be achieved, thus ensuring the reliability of the connection. As shown in fig. 21, there is illustrated a case in which the first segment structure 203 is connected to the curved plate body 1 on one side, the second segment structure 204 is connected to the curved plate body 1 on the other side, the curved plate bodies 1 on both sides are butted, and the second segment structure 204 is inserted into the through cavity 21 of the first segment structure 203, wherein it is preferable that the outer wall of the second segment structure 204 is fitted to the inner wall of the through cavity 21 of the first segment structure 203.

In this case, gaps exist between the two second segment structures 204, and between the two second segment structures and the corresponding curved plate body 1 due to the restriction of the first segment structure 203, and the gaps do not affect the integrity of the second segment 6, and the gaps can be filled with resin or additional fabric.

In the above embodiments, the connection between the first segment 5 and the second segment 6 may be made by means of an adhesive and/or a connecting piece to achieve a stable connection.

The wind power blade adopts the wind power blade girder, so that the wind power blade has the beneficial effects of the embodiment, wherein the connection positions and connection modes among different sections can be selected according to different stress conditions at different positions in the length direction of the wind power blade.

The foregoing has outlined and described the basic principles, features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The wind power blade girder is characterized by adopting a wind power blade girder segment, wherein the wind power blade girder segment comprises a curved plate body of carbon fiber with a uniform cross section, the curved plate body forms at least one arch structure, and the length direction of the arch structure is arranged along the length direction of a wind power blade; the filling structure is attached to one side of the concave of the arch structure and at least partially fills the concave; wherein the filling structure is a hollow structure;

the connecting positions of the curved plate body and the filling structure are staggered in the length direction of the wind power blade among the main girder sections of the wind power blade;

the filling structures and/or the curved plate bodies are connected through additional connecting structures.

2. Wind power blade girder according to claim 1, characterized in that the filling structure is a structure of carbon fibres of constant cross section, which structure is arranged in the length direction of the wind power blade and which structure is provided with at least one through cavity in the length direction.

3. Wind power blade girder according to claim 2, characterized in that the structural body is attached to the curved plate body through-plane and/or line.

4. A wind power blade spar according to claim 2, wherein each of the arches is provided with one of the structures.

5. The wind power blade girder according to claim 4, wherein the structural body is provided with at least two through cavities along a length direction, and a reinforcing rib body is formed between two adjacent through cavities, and the direction of the reinforcing rib body is arranged along the depth direction of the recess.

6. A wind power blade spar according to claim 2, wherein each of the arches is provided with at least two of the structures.

7. Wind blade girder according to claim 6, wherein two adjacent structures are attached by a face and/or a wire.

8. A wind power blade girder according to claim 7, wherein the outer profile section of the structures is circular, and two adjacent structures are attached by a line.

9. A wind power blade girder according to claim 8, wherein the outer profile section of the structures is polygonal, and two adjacent structures are bonded by a surface.

10. The wind power blade girder according to claim 9, wherein two adjacent structural bodies are attached by a plane, and the extending direction of the plane is the depth direction of the recess.

11. The wind power blade spar of claim 7, wherein the structure comprises a first structure having a circular outer profile cross-section and a second structure having a polygonal shape;

12. A wind power blade spar according to claim 11, wherein each of the second structures is connected to at least two of the first structures.

13. The wind power blade girder according to claim 12, wherein the second structural body is integrally connected to the curved plate body, and a space for accommodating each of the first structural bodies is formed between the second structural body and the curved plate body.

14. The wind power blade girder according to any of claims 6-13, wherein the wall thickness of each part of the structure is equal.

15. A wind power blade girder according to any of claims 6 to 13, wherein all of the structures have a position of engagement with the curved plate body.

16. A wind power blade girder according to any of claims 6 to 13, wherein part of the structure has a position of engagement with the curved plate body.

17. The wind power blade girder according to claim 1, wherein the curved plate body is a corrugated plate, and the filling structure is filled in the recesses on both sides of the curved plate body.

18. The wind turbine blade spar of claim 17, wherein the curved plate body is stacked in layers.

19. The wind power blade girder according to claim 18, wherein two adjacent layers of the curved plate bodies are attached to each other, an annular closed area is formed between the two adjacent layers of the curved plate bodies, and the filling structure is filled in the closed area.

20. The wind turbine blade spar of claim 18, wherein two adjacent layers of the curved plate bodies are spaced apart and the filler structure is disposed between two adjacent layers of the curved plate bodies.

21. Wind blade girder according to claim 19 or 20, wherein the filling structure is a 3D stereoscopic fabric.

22. Wind blade girder according to claim 2, characterized in that the structure in cross-section obtains the through cavity by means of at least two-part butt joint.

23. A wind power blade girder according to claim 22, wherein the butt joint between two adjacent parts of the structure is in misalignment and lamination.

24. A wind power blade girder according to claim 22, wherein the junction between adjacent sections of the structure is connected by side-to-side cladding.

25. A wind power blade girder according to any of claims 22 to 24, wherein the butt joint of the sections of the structure is located on a side wall extending in the depth direction of the recess.

26. The wind power blade spar of claim 1, wherein the curved plate body has a thickness at the bottom of the recess that is greater than a thickness of both sides.

27. The wind power blade girder is characterized by adopting a wind power blade girder segment, wherein the wind power blade girder segment comprises a curved plate body of carbon fiber with a uniform cross section, the curved plate body forms at least one arch structure, and the length direction of the arch structure is arranged along the length direction of a wind power blade; the filling structure is attached to one side of the concave of the arch structure and at least partially fills the concave; wherein the filling structure is a hollow structure;

the filling structures are connected by inserting one section into the hollow area of the other section.

28. A wind power blade girder according to claim 27, wherein the filling structure is a structure of carbon fibres of constant cross section, the structure being arranged in the length direction of the wind power blade and the structure being provided with at least one through cavity in the length direction.

29. A wind power blade spar according to claim 28, wherein the structure is in face and/or line engagement with the curved plate body.

30. A wind turbine blade spar according to claim 28, wherein each of the arches is provided with one of the structures.

31. A wind power blade girder according to claim 30, wherein the structural body is provided with at least two through cavities along the length direction, and a reinforcing rib is formed between two adjacent through cavities, the direction of the reinforcing rib being arranged along the depth direction of the recess.

32. A wind turbine blade spar according to claim 28, wherein each of the arches is provided with at least two of the structures.

33. A wind turbine blade spar according to claim 32, wherein two adjacent structures are joined by a face and/or wire.

34. A wind power blade girder according to claim 33, wherein the outer profile cross section of the structures is circular, and adjacent two structures are attached by a wire.

35. A wind power blade girder according to claim 34, wherein the outer profile section of the structures is polygonal, and adjacent two structures are bonded by a surface.

36. A wind power blade girder according to claim 35, wherein two adjacent structures are bonded by a plane, and the extension direction of the plane is the depth direction of the recess.

37. The wind power blade spar of claim 33, wherein the structures include a first structure having a circular outer profile cross-section and a second structure having a polygonal shape;

38. A wind turbine blade spar according to claim 37, wherein each of the second structures is connected to at least two of the first structures.

39. A wind power blade girder according to claim 38, wherein the second structural body is integrally connected to the curved plate body, and a space for accommodating each of the first structural bodies is formed between the second structural body and the curved plate body.

40. Wind power blade girder according to any of the claims 32-39, wherein the wall thickness is equal throughout the structure.

41. Wind power blade girder according to any of the claims 32-39, wherein all the structures have a fitting position with the curved plate body.

42. Wind power blade girder according to any of the claims 32-39, wherein part of the structure has a position of engagement with the curved plate body.

43. The wind turbine blade spar of claim 27, wherein the curved plate body is corrugated plate and the filling structure is filled in recesses on both sides of the curved plate body.

44. The wind turbine blade spar of claim 43, wherein the curved plate body is stacked in layers.

45. The wind turbine blade spar of claim 44, wherein two adjacent layers of curved plate bodies are bonded to each other, an annular closed region is formed between the two adjacent layers of curved plate bodies, and the filling structure is filled in the closed region.

46. The wind turbine blade spar of claim 44, wherein adjacent layers of the curved plate bodies are spaced apart and the filler structure is disposed between adjacent layers of the curved plate bodies.

47. Wind blade girder according to claim 45 or 46, wherein the filling structure is a 3D stereoscopic fabric.

48. Wind blade girder according to claim 28, wherein the structure in cross-section is obtained by butt joint of at least two parts.

49. The wind turbine blade spar of claim 48, wherein the interface between adjacent sections of the structure is offset and coincident.

50. The wind turbine blade spar of claim 48, wherein the interface between adjacent sections of the structure is joined by side-to-side cladding.

51. A wind power blade girder according to any of claims 48 to 50, wherein the butt joint of the sections of the structure is located on a side wall extending in the depth direction of the recess.

52. The wind turbine blade spar of claim 27, wherein the curved plate body has a thickness at the bottom of the recess that is greater than the thickness of both sides.

53. A wind power blade, wherein a wind power blade spar according to claim 1 or 27 is used.