CN219262568U

CN219262568U - Blade of wind driven generator

Info

Publication number: CN219262568U
Application number: CN202320775797.7U
Authority: CN
Inventors: 曹宇; 叶婷婷; 李丹; 谢振华; 王超; 马洪宇; 周浩杰
Original assignee: Wuxi Wind Power Institute Co ltd
Current assignee: Wuxi Wind Power Institute Co ltd
Priority date: 2023-04-10
Filing date: 2023-04-10
Publication date: 2023-06-27
Anticipated expiration: 2033-04-10

Abstract

The utility model belongs to the technical field of wind power, and particularly relates to a wind driven generator blade, wherein a blade body comprises an upper shell and a lower shell which are mutually adhered, the upper shell and the lower shell comprise an inner skin, a middle core material and an outer skin from inside to outside, the middle core material comprises a plurality of hollow cylindrical core materials which are arrayed, and two adjacent hollow cylindrical core materials are mutually adhered. According to the utility model, the structure of the middle core material is adjusted to be a hollow cylindrical structure, and the VAP film filling part is arranged at the gap, so that the penetration of resin into the hollow cylindrical core material is avoided when the whole blade is filled with resin, the mass of the core material is reduced by 26.59%, the whole weight is reduced while the rigidity is ensured only in the structural direction, the material use cost is saved on one hand, the hollow cylindrical core material is easy to machine and shape on the other hand, the number of the hollow cylindrical core material can be controlled according to the amount of the used material, the thickness of the central core material is easy to control, the machining pressure is further relieved, and the machining cost is saved.

Description

Blade of wind driven generator

Technical Field

The utility model belongs to the technical field of wind power, and particularly relates to a wind driven generator blade.

Background

The core material is one of key components of the wind turbine blade, is filled in the front edge, the tail edge, the web plate and other parts of the blade, generally adopts a sandwich structure, and plays a role in increasing structural rigidity, preventing local instability and improving the load resistance of the blade in the working process of the blade. Currently, the size of wind power blades is continuously increased, the mass of the wind power blades is also increased, in the design of the hundred-meter-level blades, a core material is taken as a main part of the mass ratio and accounts for about 10% of the total mass, and the increase of the mass means the increase of cost and load, so that the reduction of the mass of the hundred-meter-level blades is one of main research problems of the current blade structural design. A wind power blade, a core material for a wind power blade, and a method of manufacturing the same are disclosed in patent application publication No. CN111188729 a. The core material comprises: the insulating base material is provided with first through holes distributed in a honeycomb shape in a plane where the length direction and the width direction of the insulating base material are located; and the blocking piece is filled in the first through hole of the insulating base material, is provided with a second through hole penetrating through the thickness of the blocking piece, and is used for guiding the resin material forming the wind power blade to flow along the thickness direction of the core material. The insulating base material used for bearing and the blocking piece which is used for blocking the resin to permeate into the insulating base material are respectively and independently arranged and integrated into a whole, so that the compression strength of the core material is improved, the resin material is saved, the manufacturability of the core material is improved, and the manufacturing cost is reduced. As another example, patent publication No. CN113858659a discloses a wind power blade core structure and a laying method thereof, including a hard plate and an elastic plate, where the hard plate and the elastic plate are arranged at intervals, and the hard plate is arranged at the outer side. According to the core material structure and the laying method thereof, the hard plates are arranged on the outer side, and the hard plates and the elastic plates are arranged at intervals, so that the core material has certain elastic potential energy while maintaining strength, the core material is compressed along the elastic direction before being laid, after being laid, the core material can greatly reduce gaps between the core material and the edge, the arc-shaped and the corner of the girder and between the core material and the core material under the action of elasticity along with the release of the elastic potential energy, the formation of rich resin after filling and forming is effectively avoided, and the integral performance and the service life of the wind power blade are improved.

At present, in order to consider rigidity and reduce the quality of a core material, the application of a novel material matched with a light high-strength core material of a wind turbine blade needs to be researched and developed from the performance of the core material, so that research and development cost is increased, and the processing cost is increased due to complex processing technology, so that the overall cost of the blade is increased.

Disclosure of Invention

Aiming at the defects of the prior art, the utility model provides the wind driven generator blade, and aims to solve the technical problems that in order to lighten the mass of a core material, the performance of the core material needs to be started at present, and even a novel material needs to be researched and developed to be matched with the application of a light high-strength core material of the wind driven generator blade, so that research and development cost is increased, and in addition, the used core material is of a continuous blocky cuboid structure, and the structure cannot achieve the advantage of lightening the mass of the core material.

The utility model provides a wind driven generator blade, which has the following specific technical scheme:

the utility model provides a wind-driven generator blade, includes the blade body, the blade body is including the last casing and the lower casing of pasting each other, go up casing and lower casing from interior to exterior all including interior covering, middle core and outer covering, middle core is including a plurality of hollow cylinder cores of array arrangement, adjacent two hollow cylinder cores paste each other and connect, every hollow cylinder core's hollow part and adjacent two hollow cylinder core's space part all is equipped with VAP membrane filling part. The hollow cylindrical core material can be selected from conventional sandwich materials of wind power blades such as balsa wood, PVC foam and the like. In the blade of the wind turbine of the present utility model, the upper case is an S-surface (suction surface), and the lower case is a P-surface (pressure surface).

In some embodiments, a web is fixedly connected between the upper shell and the lower shell, and the web is filled with the middle core material.

In certain embodiments, the hollow cylindrical core material has a diameter of 30-70mm, and the hollow structure of the hollow cylindrical core material is a square structure.

In certain embodiments, the thickness of the intermediate core is 20-60mm.

In some embodiments, the tip portion of the blade body is provided with an upper fin and a lower fin, the upper fin and the lower fin are both disposed at the tail edge of the blade body, and an included angle between the upper fin and the lower fin is 20-60 °.

Further, the outer side edges of the upper wing panel and the lower wing panel are in a saw-tooth structure or a wave-shaped structure.

The utility model has the following beneficial effects: according to the wind driven generator blade, the structure of the middle core material is adjusted to be a hollow cylindrical structure, and the VAP film filling part is arranged at the gap, so that the penetration of the blade into the hollow cylindrical core material is avoided when resin is integrally poured into the blade, the similar buckling factor result value is obtained in finite element analysis, the core material quality is reduced by 26.59%, the rigidity is ensured only in the structural direction, the integral weight is reduced, the material use cost is saved, the material performance research and development requirement is avoided, the hollow cylindrical core material is easy to machine and form, the number of the hollow cylindrical core material can be controlled according to the number of the used materials, the thickness of the central core material is easy to control, the machining pressure is further relieved, and the machining cost is saved.

Drawings

FIG. 1 is a schematic plan view of a wind turbine blade in an embodiment of the utility model;

FIG. 2 is a cross-sectional view taken at A-A of FIG. 1;

FIG. 3 is a schematic perspective view of a tip portion of a blade body according to an embodiment of the present utility model;

FIG. 4 is a schematic plan view of the upper or lower wing in an embodiment of the present utility model;

FIG. 5 is a schematic perspective view of a hollow cylindrical core unit according to an embodiment of the present utility model;

fig. 6 is a schematic plan view of a finite element model of the intermediate core structure of the present utility model.

Detailed Description

The present utility model will be further described in detail below with reference to specific embodiments and with reference to the accompanying drawings, in order to make the objects, technical solutions and advantages of the present utility model more apparent.

the wind driven generator blade comprises a blade body, wherein the blade body comprises an upper shell 1 and a lower shell 2 which are adhered to each other, the upper shell 1 and the lower shell 2 respectively comprise an inner skin 51, a middle core material and an outer skin 52 from inside to outside, the middle core material comprises a plurality of hollow cylindrical core materials 53 which are arrayed, two adjacent hollow cylindrical core materials 53 are adhered to each other, and a VAP film filling part 54 is respectively arranged at the hollow part of each hollow cylindrical core material 53 and the gap part of the two adjacent hollow cylindrical core materials 53.

Specifically, a web plate 3 is fixedly connected between the upper shell 1 and the lower shell 2, and an intermediate core material is filled in the web plate 3. The upper shell 1 and the lower shell 2 form a hollow streamline structure, the integral blade interface is shown in fig. 1-2, the integral blade interface comprises a front edge 41, a main beam 42 and a tail edge 43, the web 3 is of a sandwich structure, and the sandwich layer and the upper shell 1 and the lower shell 2 are made of the same material and are all middle core materials composed of hollow cylindrical core materials 53, so that the main beam 42 is supported. The webs 3 can be arranged in number according to the requirements.

Specifically, the diameter of the hollow cylindrical core material is 30-70mm, and the hollow structure of the hollow cylindrical core material is a square structure. The use ratio of the VAP film is increased due to the fact that the diameter of the hollow cylindrical core material is too large, and machining difficulty is easily caused by the fact that the diameter of the hollow cylindrical core material is too small.

Specifically, the thickness of the intermediate core material is 20-60mm. The thickness can be adjusted according to the requirement, and if the front edge 41 of the blade needs to be increased with the position of the weight body, the thickness of the middle core material can be directly increased, namely, the height of the hollow cylindrical core material 53 can be increased. Alternatively, the thickness of the intermediate core material may be adjusted when the tail edge 43 needs to be reinforced to improve the strength of the tail edge 43.

Specifically, as shown in fig. 3, the tip portion 6 of the blade body is provided with an upper airfoil 61 and a lower airfoil 62, both of which are provided at the trailing edge 43 of the blade body, and the included angle between the upper airfoil 61 and the lower airfoil 62 is 20 to 60 °. Specifically, as shown in fig. 4, the outer edges of the upper and

lower wings

61 and 62 are in a zigzag or wave-like structure. The upper wing piece 61 and the lower wing piece 62 enable the wing profile curve of the wind turbine blade to be changed, so that the aerodynamic characteristics of the blade body are effectively improved, the saw-tooth structure or the wave structure can assist to interfere with the aerodynamic shape of the blade surface, the vortex energy attached to the surface of the blade body is reduced, the flutter of the blade body is further reduced, and the service life of the blade is prolonged.

As shown in fig. 5, the present embodiment provides an intermediate core material composed of a hollow cylindrical core material 53, an outer skin 52, an inner skin 51, and a VAP film filling portion 54.

The hollow cylindrical core material 53 is made of bassal wood, the diameter of each cylinder is 50mm, and the middle hollow part is approximately 16.6mm by 50mm cuboid.

The upper and lower sides of the hollow cylindrical core material 53 are respectively connected with the outer skin 52 and the inner skin 51.

The void portions of adjacent two hollow cylindrical core materials 53 and the hollow portion of a single hollow cylindrical core material 53 are filled with the VAP film filling portion 544, preventing infiltration when the entire blade is impregnated with resin, resulting in an increase in blade quality.

The hollow cylindrical cores 53 are required to be kept in parallel in axis during cutting and manufacturing, and the cylinders are closely contacted. The diameter of the cylinder and the size of the cuboid of the hollow part need to be adjusted according to the specific blade model and load.

Fig. 6 is a finite element model of the intermediate core structure in this embodiment, model dimensions: the shell units are selected from the skin units at the upper end and the lower end of the 400 mm/3200 mm/50 mm core material, and the body units are selected from the cylindrical core material units.

The material properties of the core material in the simulation process select the properties of the bassal wood:

e11 =55 Mpa, e22=55 Mpa, g12=105 Mpa, g23=230 Mpa, g13=230 Mpa, poisson ratio μ=0.3, density ρ= 2.7645E-07kg/mm ³ ；

The skins on the upper side and the lower side of the core material are made of triaxial cloth materials, and the material properties of the triaxial cloth materials are as follows:

e11 21000Mpa, e22=16000 Mpa, g12=12500 Mpa, g23=4000 Mpa, g13=4000 Mpa, poisson's ratio μ=0.57, density ρ=1.99E-06 kg/mm ³ The thickness of the single layer is 0.974mm. The total mass of the model was 26.58kg, with an intermediate core mass of 11.69kg.

The nodes on the left side of the model apply 6 degrees of freedom constraints, the free edges on the right side of the model apply a total of 1000N of pressure, and the overall structural stability and displacement are calculated.

Through calculation and analysis, under the result of obtaining the same buckling factor and displacement, compared with the common plate structure core material of the same material, the middle core material formed by the hollow cylindrical core material 53 in the embodiment can save 4.23kg, reduce the mass of the core material by 26.59%, and realize the reduction of the mass of the structure while meeting the use performance.

As shown in the table below, the cylindrical core material can save 26.59% of mass compared with the common core material under the condition that the similar buckling factor and the maximum displacement result of the model are obtained through calculation.

In summary, according to the wind turbine blade provided by the utility model, the structure of the middle core material is adjusted to be a hollow cylindrical structure, and the VAP film filling part 54 is arranged at the gap, so that the quality of the blade is increased when the whole blade is filled with resin, and the quality of the core material is reduced by 26.59% by obtaining the value of the similar buckling factor result in finite element analysis, so that the rigidity is ensured only in the structural direction, the whole weight is reduced, the material use cost is saved, the research and development requirements from the material performance are avoided, the hollow cylindrical core material 53 is easy to machine and form, the number of the hollow cylindrical core material 53 can be controlled according to the amount of the used material, the thickness of the center core material is easy to control, and the machining pressure is further relieved, and the machining cost is saved.

The above preferred embodiments of the present utility model are not limited to the above examples, and the present utility model is not limited to the above examples, but can be modified, added or replaced by those skilled in the art within the spirit and scope of the present utility model.

Claims

1. The wind driven generator blade is characterized by comprising a blade body, wherein the blade body comprises an upper shell and a lower shell which are mutually adhered, the upper shell and the lower shell comprise an inner skin, a middle core material and an outer skin from inside to outside, the middle core material comprises a plurality of hollow cylindrical core materials which are arrayed, two adjacent hollow cylindrical core materials are mutually adhered, and a VAP film filling part is arranged at the hollow part of each hollow cylindrical core material and at the gap part of each adjacent hollow cylindrical core material.

2. The wind turbine blade of claim 1, wherein a web is fixedly connected between the upper shell and the lower shell, the web being filled with the intermediate core material.

3. A wind turbine blade according to claim 1, wherein the hollow cylindrical core material has a diameter of 30-70mm, and the hollow structure of the hollow cylindrical core material has a square structure.

4. A wind turbine blade according to claim 1, wherein the thickness of the intermediate core is 20-60mm.

5. The wind turbine blade according to claim 1, wherein the blade tip of the blade body is provided with an upper fin and a lower fin, the upper fin and the lower fin are both provided at the trailing edge of the blade body, and an included angle between the upper fin and the lower fin is 20-60 °.

6. The wind turbine blade of claim 5, wherein the outboard edges of the upper and lower fins are saw tooth or wave like structures.