CN210106062U

CN210106062U - Wind wheel blade

Info

Publication number: CN210106062U
Application number: CN201920478452.9U
Authority: CN
Inventors: 谢惠; 关洪涛; 乔阳阳; 石志琪; 陈佳佳; 张志杰
Original assignee: LUOYANG SUNRUI WIND TURBINE BLADE Ltd
Current assignee: Xiamen Shuangrui Wind Power Technology Co ltd
Priority date: 2019-04-10
Filing date: 2019-04-10
Publication date: 2020-02-21
Anticipated expiration: 2029-04-10

Abstract

The utility model discloses a wind wheel blade, which belongs to the technical field of wind power generation, and comprises a pressure surface shell arranged on the windward side and a suction surface shell arranged on the leeward side and adhered with the edge of the pressure surface shell to form a cavity, wherein the inner walls of the pressure surface shell and the suction surface shell are respectively provided with a girder which is consistent with the corresponding shell radian and extends along the length direction of the shell and is used for increasing the strength of the blade; the large beam of the suction surface is composed of a glass fiber layer, and the large beam of the pressure surface is connected with the large beam of the suction surface through at least one web plate. The wind wheel blade adopting the structure has the advantages of high rigidity and light weight, and can reduce the production cost of enterprises.

Description

Wind wheel blade

Technical Field

The utility model belongs to the technical field of wind power generation technique and specifically relates to a wind wheel blade is related to.

Background

Generally, the windward bearing surface of a wind turbine blade is called a pressure surface, and the leeward bearing surface is called a suction surface. Because of its light specific gravity, good fatigue strength and mechanical properties, glass fiber is widely used, so that a wind turbine blade is usually formed by bonding and combining a pressure surface shell and a suction surface shell of glass fiber reinforced resin. The glass fiber reinforced resin casing is relatively light and low in strength. Therefore, in order to increase the strength of the wind turbine blade, a girder is laid inside the shell to increase the strength of the shell. Typically, the longerons extend substantially in the length direction of the rotor blade.

In the wind wheel blade in the prior art, a pressure surface girder bonded on a pressure surface shell and a suction surface girder bonded on the inner side of a suction surface shell are all formed by laminating glass fiber layers, sometimes the length of the blade is large, and in order to prevent a blade tip from touching a tower frame under extreme wind load, the carbon fiber layers with higher strength are also used for laminating the girder. However, the glass fibers have low rigidity and high density, and cannot add sufficient rigidity to the wind turbine blade. Carbon fibers are strong and lightweight, but are expensive and not widely used. Therefore, there is a need for a wind turbine blade that is rigid, lightweight, and inexpensive.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a rigidity is high, light in weight and can reduce manufacturing cost's wind wheel blade.

The utility model discloses a solve the technical scheme that above-mentioned technical problem adopted and be:

a wind wheel blade comprises a pressure surface shell arranged on a windward side and a suction surface shell which is adhered with the edge of the pressure surface shell to form a cavity and is arranged on a leeward side, the inner walls of the pressure surface shell and the suction surface shell are respectively provided with a girder which is consistent with the radian of the corresponding shell and extends along the length direction of the shell and is used for increasing the strength of the blade, the pressure surface girder is formed by laminating a glass fiber layer clinging to the inner wall of the pressure surface shell and a carbon fiber layer clinging to the glass fiber layer along the length direction, and a transition layer with the content ratio of carbon fiber to glass fiber continuously changing is arranged between the glass fiber layer and the carbon fiber layer; the large beam of the suction surface is composed of a glass fiber layer, and the large beam of the pressure surface is connected with the large beam of the suction surface through at least one web plate.

Further, the transition layer is formed by alternately laying a plurality of carbon fiber layers and glass fiber layers.

Furthermore, the transition layer is formed by bonding a carbon fiber block and a glass fiber block which are bounded by an arc surface where the opposite angles of the transition layer are located or an arc surface matched with the pressure surface girder in radian, and the carbon fiber block is tightly attached to the carbon fiber layer.

Further, the thickness of the girder of the suction surface is thicker than the whole thickness of the girder of the pressure surface.

Has the advantages that:

as above, the utility model discloses a wind wheel blade has following beneficial effect:

1: the pressure surface girder of the wind wheel blade adopts a structure that the carbon fiber layer is combined with the glass fiber layer, and the carbon fiber layer has high rigidity because the pressure surface of the wind wheel blade mainly bears tensile load, so that the application of part of the carbon fiber layer on the pressure surface of the wind wheel blade is favorable, and the carbon fiber layer is adopted in part, thereby ensuring the performance and reasonably reducing the production cost of the wind wheel blade. The girder of the suction surface is formed by laying a glass fiber layer, because the suction surface of the wind wheel blade is mainly subjected to pressure load, the glass fiber has high pressure strain, the application of the glass fiber on the girder of the suction surface of the wind wheel blade is favorable, and the relative thickness of the glass fiber layer can provide enough buckling resistance. The girder of the pressure surface of the wind wheel blade adopts a laminated structure of a carbon fiber layer and a glass fiber layer, the advantages of the two materials are fully exerted, and the defects of the two materials are reduced. Compared with a pure carbon fiber girder, the wind turbine blade with the structure of the invention has better compression strain and lower price; this blade has a higher stiffness and a lower weight compared to a pure glass fibre girder.

2: a transition layer is arranged between a carbon fiber layer and a glass fiber layer of a pressure surface girder of the wind wheel blade, and carbon fibers and glass fibers in the transition layer are continuously changed, so that smooth transition of the carbon fiber layer and the glass fiber layer is facilitated.

3: the thickness of the girder of the suction surface is thicker than the whole thickness of the girder of the pressure surface, so that the buckling resistance of the girder of the suction surface is improved.

The present invention will be described in further detail with reference to the drawings and specific examples.

Drawings

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

Fig. 1 is a cross-sectional view of an impeller blade in the present invention.

Fig. 2 is a schematic diagram of a structure of the transition layer in fig. 1.

Fig. 3 is another schematic structure diagram of the transition layer of fig. 1.

Fig. 4 is a schematic view of another structure of the transition layer of fig. 1.

The drawing mark comprises a pressure surface shell 1, a pressure surface girder 2, a pressure surface girder 21, a glass fiber layer 22, a carbon fiber layer 23, a transition layer 3, a web plate 4, a suction surface girder 5 and a suction surface shell.

Detailed Description

In the present application, the expression "continuously" should be understood in a broader sense, and in a sense including "gradually" and "uniformly".

The core of the utility model is to provide a wind wheel blade, this wind wheel blade medium pressure face girder 2 is different with the component structure of suction surface girder 4, can make wind wheel blade under the prerequisite of guaranteeing that rigidity is high, light in weight, can reduction in production cost.

In the utility model, the carbon fiber layer and the carbon fiber block are formed by adopting a plurality of layers of carbon fiber cloth and solidifying; the glass fiber layer and the glass fiber block are formed by layering and solidifying multiple layers of glass fiber cloth.

Referring to fig. 1, fig. 1 is a cross-sectional view of a wind turbine blade according to the present invention.

The utility model provides a wind wheel blade, wind wheel blade are including being used for installing the root region on fan wheel hub with wind wheel blade, and the position relative with the root region is equipped with wind wheel blade's point portion. The blade body area of the wind wheel blade extends between the root area and the tip area, and structurally mainly comprises a pressure surface shell 1 and a suction surface shell 5, wherein the pressure surface shell 1 is used for being arranged on the windward side, the suction surface shell 5 is used for being arranged on the leeward side, and the pressure surface shell 1 and the edge of the suction surface shell 5 are bonded to form a cavity structure with a streamline section. The inner side of the pressure surface shell 1 is provided with a pressure surface girder 2 which has the same radian as the shell and extends along the length direction of the blade, the inner side of the suction surface shell 5 is provided with a suction surface girder 4 which has the same radian as the shell and extends along the length direction of the blade, and at least one web plate 3 is connected between the pressure surface girder 2 and the suction surface girder 4. In the prior art, the web 3 generally comprises a leading edge web and a trailing edge web.

The pressure surface girder 2 is formed by laminating and solidifying a carbon fiber layer 22 and a glass fiber layer 21 in the length direction of the blade, and the whole suction surface girder 4 is made of the glass fiber layer 21.

Since the suction side of the wind turbine blade is mainly subjected to pressure loads and the glass fibres have high pressure strains, it is advantageous to apply glass fibres to the girder 4 at the suction side of the wind turbine blade and the relative thickness of the glass fibre layer 21 provides sufficient buckling resistance. On the other hand, the pressure surface of the wind turbine blade is mainly subjected to tensile loads, and carbon fibers have high rigidity, so that the application of carbon fibers to the pressure surface girder 2 of the wind turbine blade is advantageous. In order to ensure the strength of the wind wheel blade and effectively reduce the production cost, a structure that the carbon fiber layer 22 and the glass fiber layer 21 are laminated can be adopted in the pressure surface girder 2, the advantages of the two materials are fully exerted, and the defects of the two materials are reduced. The wind turbine blade having the above-described structure exhibits superior compressive strain and lower price compared to a pure carbon fiber girder; this blade has a higher stiffness and a lower weight compared to a pure glass fibre girder.

As shown in fig. 1, the pressure surface side member 2 is formed by laminating a glass fiber layer 21 in close contact with the inner wall of the pressure surface casing 1 and a carbon fiber layer 22 in close contact with the glass fiber layer 21 in this order. The pressure surface girder 2 is provided with the transition layer 23 between the carbon fiber layer 22 and the glass fiber layer 21, and the quantitative ratio between the glass fiber and the carbon fiber in the transition layer 23 is continuously changed, so that the smooth transition of the carbon fiber layer 22 and the glass fiber layer 21 with different rigidities is realized. The following describes specific composition of several transition layers 23.

It should be mentioned that, in the process of manufacturing the pressure surface girder 2, the carbon fiber layer 22 may be laid at a critical position of the pressure surface girder 2, which has high requirements on material strength and rigidity, according to the actual working environment.

Alternatively, as shown in fig. 2, the transition layer 23 may be formed by alternately laying a plurality of carbon fiber layers and glass fiber layers.

Alternatively, the transition layer 23 may be formed by splicing carbon fiber blocks and glass fiber blocks. The shapes of the carbon fiber blocks and the glass fiber blocks are not limited as long as the structure and the performance of the transition layer can meet the requirements, and two specific embodiments are given below, wherein the transition layer 23 is formed by splicing the carbon fiber blocks and the glass fiber blocks:

in a specific embodiment, as shown in fig. 3, the transition layer 23 is formed by bonding carbon fiber blocks and glass fiber blocks, which are in a shape of a curved surface matched with the pressure surface girder 2 or the carbon fiber layer 22, preferably, the carbon fiber blocks are closely attached to the carbon fiber layer 22. It should be appreciated that the arc that coincides with the arc of the pressure face longeron 2 may intersect both the midpoints of the width sides of the transition layer 23 or the point of 1/3.

In another embodiment, as shown in fig. 4, the transition layer 23 is formed by bonding carbon fiber blocks and glass fiber blocks, wherein the arc surfaces of the transition layer 23 at opposite corners are used as boundaries. Preferably, the carbon fiber blocks are adjacent to the carbon fiber layer 22.

In the specific embodiment in which the transition layer 23 is formed by splicing carbon fiber blocks and glass fiber blocks, the shapes of the splicing surfaces of the carbon fiber blocks and the glass fiber blocks are not limited. The contact surface (i.e. the splicing surface) of the carbon fiber block and the glass fiber block can be a smooth cambered surface, and can also be a sawtooth shape or a step shape.

Preferably, the thickness of the suction surface girder 4 may be set thicker than the thickness of the pressure surface girder 2 to improve the buckling resistance of the suction surface girder 4.

In conclusion, the wind wheel blade adopting the structure has the advantages of high rigidity, light weight and the like, and the production cost of the wind wheel blade can be reduced.

The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other.

It is right above that the utility model provides a wind wheel blade has carried out the detailed introduction, and it is right to have used specific individual example herein the utility model discloses a principle and concrete implementation are elucidated, and above-mentioned embodiment only is used for helping understanding the utility model discloses a method and core thought. It should be noted that any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are within the scope of the present invention for those skilled in the art.

Claims

1. The utility model provides a wind wheel blade, is used for establishing suction side casing (5) at the leeward side including being used for establishing pressure side casing (1) at the windward side and with the marginal adhesion formation cavity of pressure side casing (1), its characterized in that: the inner walls of the pressure surface shell (1) and the suction surface shell (5) are respectively provided with a girder which is consistent with the radian of the corresponding shell and extends along the length direction of the shell and is used for increasing the strength of the blade, the pressure surface girder (2) is formed by laminating a glass fiber layer (21) clinging to the inner wall of the pressure surface shell (1) and a carbon fiber layer (22) clinging to the glass fiber layer (21) along the length direction, and a transition layer (23) with the content ratio of carbon fiber to glass fiber continuously changing is arranged between the glass fiber layer (21) and the carbon fiber layer (22); the suction surface girder (4) is composed of a glass fiber layer (21), and the pressure surface girder (2) and the suction surface girder (4) are connected through at least one web (3).

2. A wind turbine blade according to claim 1, wherein: the transition layer (23) is formed by alternately laying a plurality of carbon fiber layers and glass fiber layers.

3. A wind turbine blade according to claim 1, wherein: the transition layer (23) is formed by bonding a carbon fiber block and a glass fiber block which are bounded by an arc surface where the opposite angle of the transition layer (23) is located or an arc surface matched with the pressure surface girder (2) in radian, wherein the carbon fiber block is tightly attached to the carbon fiber layer (22).

4. A wind turbine blade according to claim 1, wherein: the thickness of the girder (4) on the suction surface is thicker than the whole thickness of the girder (2) on the pressure surface.