CN219262569U

CN219262569U - Wind power blade structure with reinforcing rib plate

Info

Publication number: CN219262569U
Application number: CN202320879822.6U
Authority: CN
Inventors: 徐宇; 王学鑫; 曹艳彬; 张淑丽
Original assignee: Sino-Wind Energy Group Ltd
Current assignee: Sino-Wind Energy Group Ltd
Priority date: 2023-04-19
Filing date: 2023-04-19
Publication date: 2023-06-27
Anticipated expiration: 2033-04-19

Abstract

The utility model discloses a wind power blade structure with reinforcing rib plates, wherein the reinforcing rib plates are transversely arranged between a tail edge web plate and a front side web plate of the wind power blade structure on key areas with lower buckling load factors in the rear edge area and front and rear of the maximum chord length of the wind power blade in the span direction, two ends of the reinforcing rib plates are vertically and fixedly connected with the web plate, and a quadrilateral box-shaped cavity near the tail edge is spatially divided into at least two sub-cavities which are distributed up and down. The reinforcing rib plates are arranged at the spreading position where the maximum chord length of the blade is located and the adjacent area of the reinforcing rib plates in the spreading direction. According to the wind power blade, the reinforcing rib plate connecting webs are added to the front and rear areas of the maximum chord length stretching position, so that the rear edge cavity is divided into at least two parts, the parallelogram-like cavity is changed into at least two approximately right trapezoid-shaped cavities, the size of the rear edge cavity is reduced, the stability of the rear edge of the blade is improved, and the technical problem of low structural stability of the existing wind power blade is solved.

Description

Wind power blade structure with reinforcing rib plate

Technical Field

The utility model belongs to the technical field of wind power generation, relates to a wind power blade, and particularly relates to a wind power blade structure with reinforcing rib plates, which can effectively improve the structural stability of the wind power blade.

Background

The fan blade is a key component of the wind driven generator, the performance of the fan blade directly influences the operation and stability of the whole wind driven generator, and along with the increase of the single machine capacity of the wind driven generator, the wind power blade is longer and longer, and higher requirements are provided for the integral buckling stability of the blade. Along with the increase of the chord length of the large blade, the cavity of the trailing edge area with the maximum chord length is larger, larger out-of-plane deformation is easy to occur, and a plurality of buckling instability damage phenomena are also caused on the test piece. Therefore, the design of the blade trailing edge web becomes critical, and in order to overcome the technical problem that the stability of the blade in the area near the maximum chord length is poor, the number of the blade webs is generally increased, but the weight of the blade is correspondingly increased more after the number of the webs is increased. In addition, the approximately parallel blade web form forms a parallelogram-like box structure with the blade shells, which is less stable.

Disclosure of Invention

First technical problem

In order to overcome the defects and shortcomings in the prior art, the wind power blade structure with the reinforcing rib plates is provided, one or more sections of transverse reinforcing rib plates are added to a key area with a lower buckling load factor in a trailing edge area before and after the maximum chord length of the blade, the two webs are connected, the trailing edge web is divided into at least two parts with cavities of a suction surface and a pressure surface, the cavities similar to a parallelogram are changed into at least two cavities similar to a right trapezoid, the size of the trailing edge cavity is reduced, and therefore, the stability of the trailing edge of the blade can be improved through changing the geometric form of the cavity, so that the technical problem of low structural stability of the existing wind power blade is solved.

(II) technical scheme

The technical scheme adopted by the utility model for solving the technical problems is as follows:

the wind power blade structure with reinforcing rib plate includes blade suction surface shell, blade pressure surface shell and several webs which are extended along the direction of spanwise direction and are basically parallel to each other, in the several webs at least a tail edge web and a middle web which is positioned in front of the described tail edge web in the chord length direction, between the described tail edge web and middle web and blade suction surface shell and blade pressure surface shell a quadrilateral box-shaped cavity body adjacent to blade tail edge in the chord length direction is formed,

at least one reinforcing rib plate which is transversely arranged is arranged between the tail edge web plate and the middle web plate at the front side of the tail edge web plate, one end of each reinforcing rib plate is perpendicular to the tail edge web plate and fixedly connected with the tail edge web plate, the other end of each reinforcing rib plate is perpendicular to the middle web plate and fixedly connected with the middle web plate, the surface normal direction of each reinforcing rib plate is basically perpendicular to the chord length direction of the position where the reinforcing rib plate is located, and the reinforcing rib plate divides the quadrangular box-shaped cavity into at least two sub-cavities which are distributed up and down in space.

Preferably, the reinforcing rib plate is arranged at the position of the maximum chord length of the blade in the spanwise direction and the area nearby the position.

Further, the spanwise length of the reinforcing rib plate is determined according to the spanwise position of the maximum chord length of the blade and the buckling load factor of the area nearby the spanwise position.

Preferably, two ends of the reinforcing rib plate are respectively adhered to the tail edge web plate and the middle web plate through structural adhesive, and round corner structures are arranged on two sides of each adhering position.

Preferably, the number of the reinforcing ribs is one, and the reinforcing ribs spatially pass through the centroid of the quadrangular box-shaped cavity. The tail edge quadrilateral box-shaped cavity can be reduced by arranging the reinforcing rib plates, the geometry of the cavity is changed, the stability of the blade is improved, and the respiratory effect of the blade before and after the maximum chord length is reduced.

Preferably, the reinforcing rib plate is of a composite material sandwich structure and comprises a core material and double-shaft glass fiber cloth wrapping the surface of the core material.

Further, the core material is PVC60 or PET foam material, and the biaxial glass fiber cloth is small-gram-weight biaxial glass fiber cloth. The purpose of using the small gram weight double-shaft glass fiber cloth is to reduce the weight of the reinforcing rib plate.

(III) technical effects

Compared with the prior art, the wind power blade structure with the reinforcing rib plate has the remarkable technical effects that: according to the utility model, one or more sections of transverse reinforcing rib plates are added to the key areas with lower buckling load factors in the trailing edge areas before and after the maximum chord length of the blade in the spanwise direction to connect two webs, and particularly, the trailing edge cavity can be divided into a plurality of subchambers by arranging the reinforcing rib plates between the trailing edge web plate and the middle web plate on the front side of the trailing edge web plate, so that the size of the trailing edge cavity is reduced, the geometric shape of the trailing edge cavity is changed, the stability of the blade is improved, and the respiratory effect of the blade before and after the maximum chord length is reduced.

Drawings

FIG. 1 is a cross-sectional view of a wind power blade provided in embodiment 1 of the present utility model;

FIG. 2 is a cross-sectional view of a wind power blade according to embodiment 2 of the present utility model;

reference numerals illustrate:

1-front edge web, 2-1 middle web, 2-1 first middle web, 2-2 second middle web, 3-tail edge web, 4-reinforcing rib plate, A, C is an intersection point between the web and a blade suction surface shell, B, D is an intersection point between the web and a blade pressure surface shell, and E, F is an intersection point between the reinforcing rib plate and the web.

Detailed Description

For a better understanding of the present utility model, the technical solutions of the present utility model will be clearly and fully described below with reference to the following examples, and it is apparent that the described examples are some, but not all, examples of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model. The embodiments of this patent are described based on the three-web version and three main webs plus a shorter small web version common to current large megawatt blades.

Example 1

As shown in fig. 1, for a large-size large-length wind power blade, because the cavity in the area of the maximum chord length trailing edge is larger, the phenomena of larger out-of-plane deformation and buckling instability and damage easily occur, in order to improve the structural stability of the wind power blade, especially in the area near the maximum chord length, the wind power blade in this embodiment adopts a three-web wind power blade, that is, three webs which extend along the spanwise direction and are basically parallel to each other are arranged in a wind power blade shell, namely, a leading edge web 1 arranged near the leading edge of the blade in the chord length direction, a trailing edge web 3 arranged near the trailing edge of the blade, and a middle web 2 arranged between the leading edge web 1 and the trailing edge web 3, the surfaces of the

webs

1, 2 and 3 are basically perpendicular to the chord direction of the blade, and a parallelogram-like box structure is formed between the adjacent webs and the pressure surface shell and the suction surface shell of the blade, so that the stability of the structure is poor. In order to further improve the stability of the trailing edge structure at the position of the maximum chord length of the wind power blade, the utility model improves the original web structure by adding the reinforcing rib plates 4.

Specifically, in the position of the maximum chord length of the blade and the positions around the position, due to the lower buckling load factor of the trailing edge region, one or more sections of reinforcing rib plates 4 (a condition that one section of reinforcing rib plates 4 is arranged is shown in fig. 1) are arranged between the trailing edge web plate 3 of the blade and the middle web plate 2 positioned at the front side of the trailing edge web plate 3, the two webs of the trailing edge web plate 3 and the middle web plate 2 are connected through the reinforcing rib plates 4 which are transversely arranged, and the parallelogram-like trailing edge cavity surrounded by the trailing edge web plate 3, the middle web plate 2, the suction surface shell and the pressure surface shell is divided into an upper cavity and a lower cavity which are approximately in a right trapezoid shape, so that the size of the original trailing edge cavity is reduced, and the structural stability of the trailing edge of the blade can be improved through changing the geometric form of the cavity, so that the technical problem of low structural stability of the wind power blade is relieved.

Referring to fig. 1, the placement position EF of the reinforcing rib plate 4 arranged transversely is approximately equal to the areas of the two cavities ACFE and DBEF formed by the suction side shell, the pressure side shell, the middle web 2 and the tail edge web 3. The reinforcing plate 4 is placed at the area half position EF of the cavity ABCD. Because the chord length of the place where the reinforcing rib plate 4 is placed is large, operators can enter the inside of the blade shell to carry out scribing and positioning and the reinforcing rib plate installation work. Firstly, the centroid of the quadrilateral ABDC is found, then the placement position E of one end where the reinforcing rib plate 4 needs to be placed is marked by the centroid being perpendicular to the middle web plate 2, and then the placement position F of the other end of the reinforcing rib plate 4 is marked by the centroid being perpendicular to the tail edge web plate 3. The reinforcing rib plate 4 is bonded with the middle web plate 2 and the tail edge web plate 3 through structural adhesive at E and F, and the two sides of the structural adhesive are subjected to fillet treatment at E, F at the positions of the structural adhesive.

The reinforcing rib plates 4 which are transversely arranged are formed by wrapping double-shaft glass fiber cloth by a core material, and the distribution condition of the reinforcing rib plates 4 along the span direction of the blade is determined according to buckling load factors of the area near the maximum chord length of the actual design of the wind power blade. For example, the maximum chord length of a certain model is 15m in the spanwise direction, buckling modes are arranged before and after the spanwise directions 14m and 17m of the blades, buckling load factors are smaller, the design requirement is not met, and two reinforcing rib plates 4 which are transversely arranged can be arranged in the corresponding area of the spanwise direction.

The reinforcing rib plates 4 are independently prepared and are arranged on two webs close to the tail edge of the blade through positioning blocks after suction injection on the platform is completed. Firstly, the centroid of a quadrilateral cavity formed by the tail edge web plate 3 and the middle web plate 2 at the front side of the tail edge web plate and the shell surface of the blade is found, the reinforcing rib plate 4 is placed at the position which passes through the centroid and is perpendicular to the two

web plates

2 and 3, and after the placement position of the reinforcing rib plate 4 is determined, structural adhesive is smeared between the reinforcing rib plate 4 and the

web plates

2 and 3 for bonding and fixing. In this way, the trailing edge cavity of the blade is reduced, the geometry of the trailing edge cavity is altered to improve blade stability and reduce the respiratory effects of the blade before and after the maximum chord length. The core material of the reinforcing rib plate 4 can be PVC60 or PET foam materials with similar density, and the biaxial cloth wrapping the rib plate adopts 200 gram weight biaxial glass fiber cloth (45/-45 degree gram weight). The use of a small grammage biaxial cloth is intended to reduce the weight of the gusset.

Example 2

As shown in fig. 2, the wind power blade is a four-web blade, and four webs are a front edge web 1, a first middle web 2-1, a second middle web 2-2 and a tail edge web 3 respectively, and in this embodiment, an original web structure is improved by adding reinforcing rib plates 4. The placement position EF of the reinforcing rib plate 4 is approximately equal to the areas of the two cavities ACFE and DBEF formed by the suction surface shell, the pressure surface shell, the second middle web plate 2-2 and the tail edge web plate 3. The reinforcing plate 4 is placed at the area half position EF of the cavity ABDC. Because the chord length of the place where the reinforcing rib plate 4 is placed is large, operators can enter the wind power blade shell to carry out scribing and positioning and reinforcing rib plate installation work. Firstly, the centroid of the quadrilateral ABDC is found, then the position E where one end of the reinforcing rib plate 4 needs to be placed is marked by the centroid being vertical to the middle web plate 2-2, and then the position F at the other end of the reinforcing rib plate 4 is marked by the centroid being vertical to the tail edge web plate 3. The reinforcing rib plate 4 is bonded with the middle web plate 2-2 and the tail edge web plate 3 through structural adhesive at E and F, and fillet treatment is carried out on two sides of the structural adhesive at E, F at the position of the structural adhesive.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

Claims

1. The wind power blade structure with reinforcing rib plate includes blade suction surface shell, blade pressure surface shell and several webs which are extended along the direction of spanwise direction and are basically parallel to each other, in the several webs at least a tail edge web and a middle web which is positioned in front of the described tail edge web in the chord length direction, between the described tail edge web and middle web and blade suction surface shell and blade pressure surface shell a quadrilateral box-shaped cavity body adjacent to blade tail edge in the chord length direction is formed,

2. The wind power blade structure with reinforcing rib according to claim 1, wherein the reinforcing rib is arranged in a spanwise direction at a spanwise location where a maximum chord length of the blade is located and in a vicinity thereof.

3. The wind power blade structure with reinforcing rib plates according to claim 2, wherein the spanwise length of the reinforcing rib plates is determined according to the buckling load factor of the spanwise location where the maximum chord length of the blade is located and the vicinity thereof.

4. The wind power blade structure with reinforcing rib plates according to claim 1, wherein two ends of the reinforcing rib plates are respectively adhered to the tail edge web plate and the middle web plate through structural adhesive, and round corner structures are arranged on two sides of each adhering position.

5. The wind power blade structure with reinforcing ribs as set forth in claim 1, wherein the number of said reinforcing ribs is one, and said reinforcing ribs spatially pass through the centroid of said quadrangular box-shaped cavity.

6. The wind power blade structure with the reinforcing rib plate according to claim 1, wherein the reinforcing rib plate is a composite material sandwich structure and comprises a core material and double-shaft glass fiber cloth wrapped on the surface of the core material.

7. The wind power blade structure with reinforcing ribs as set forth in claim 6, wherein the core material is PVC60 or PET foam material, and the biaxial glass fiber cloth is a biaxial glass fiber cloth with a small gram weight.