CN205423056U - Sectional type wind -powered electricity generation blade - Google Patents

Abstract

The utility model patent discloses a segmented wind power blade. The segmented blade is formed by connecting two or more segments of composite material blades through a plurality of studs. The connecting bolt group includes studs, pre-embedded Bolt sleeves and light sleeves. A prefabricated prosthesis that can be taken out is pre-embedded at the end of the pre-embedded light sleeves. Studs and nuts are used to connect the bolt sleeves and light sleeves to realize the connection of blade segments. The alternate arrangement of bolt sleeves and light sleeves reduces Effect of prosthesis on structural strength. Fix and position the flange on the mold, lay the outer layer of fiber cloth, fix the bolt sleeve, light sleeve and prosthesis in sequence, place the composite material and light material wedge strip, lay the inner layer of fiber cloth, and lay the vacuum auxiliary material to complete each blade segment Take out all the prostheses and tighten the nuts one by one to complete the assembly of the blade segments.

Description

A segmented wind turbine blade

technical field

The utility model relates to a segmented wind power blade, in particular to a multi-section connected wind power blade, which belongs to the field of wind power blade manufacturing.

Background technique

The use of a large amount of fossil energy has not only promoted the development of technology, but also increased the burden on the earth's ecological environment. Air pollution threatens human life and health. Renewable energy has gradually become the preferred energy resource and will occupy a more important position in the energy structure of various countries. , as a form of renewable energy, wind energy has the advantages of low development cost, mature technology, and wide distribution, and has become a key direction for the development of renewable energy in recent years. In order to make full use of wind energy resources, wind turbines are gradually becoming large-scale, and the length of their blades is also increasing. The areas rich in wind resources are often remote mountainous areas, inaccessible desert areas, poor traffic conditions, and it is very difficult to transport long blades. After the blade reaches a certain length, this is also the range where transportation is prohibited. It can be seen that the large-scale wind turbine is restricted by transportation conditions.

At present, wind power blades are generally made of fiber-reinforced polymer-based composite materials, and the production process of composite material blades has strict requirements on the environment and technology. Many wind farms are located in places with severe wind and sand or high humidity and salinity. In this environment, it is difficult to effectively guarantee the production quality of wind power blades, and the carbon fiber used in ultra-long blades is more sensitive to production conditions, making it even more difficult to control the quality of the blades. There are also geographical limitations in the construction of blade production bases near wind farms, the radiation range is limited, and the comprehensive cost of blades will be greatly increased. It can be seen that when the length of the blade reaches a certain limit, there are many difficult constraints in the production, transportation and installation of the traditional integral blade. On-site assembly is an effective method to solve the large-scale wind turbine.

Segmented blades need to be assembled before hoisting to form a whole with continuous aerodynamic shape, complete structure and complete functions. Existing segmented blades mostly use T-bolts to realize the connection of the blade structure. This method requires drilling and positioning operations on the composite material structure of the connecting section, which is quite demanding on the drilling accuracy and geometric positioning. Positioning In fact, the allowable deviation is very small. Only in this way can the precise fit of the connecting parts be guaranteed. During assembly, this method also has the problem of narrow operating space, and requires high levels of workers' skills and equipment for on-site operations. Therefore, the structure of the segmented wind turbine blade directly affects its assembly method. At the same time, the T-bolt connection is not conducive to the reliability of the structure due to its low connection stiffness and low connection efficiency. Therefore, it is necessary to separate the existing wind turbines. The structure of segmented blades is improved.

Utility model content

In view of the above shortcomings and deficiencies of the prior art, the technical problem to be solved by the utility model is to provide a segmented wind turbine blade with high connection efficiency, small aerodynamic loss and simple operation.

The technical scheme that the utility model takes for solving its technical problem is:

A segmented wind power blade, comprising at least two blade segments, each blade segment is sequentially connected by a connecting bolt group to form a whole blade, characterized in that the blade segment includes a skin main body, a double-ended stud, Bolt sleeve, bare sleeve, prosthetic body cavity, double-ended studs are installed in the bolt sleeve and light sleeve, the prosthetic cavity is located at the spanwise end of the light sleeve, and the skin body is alternately arranged with bolt sleeves and light sleeves in the section section.

Preferably, the bolt sleeve is pre-embedded on the connection end surface of the skin body, and the light sleeve is correspondingly embedded on the connection end surface of another skin body. One end of the double-ended stud is connected to the bolt sleeve, and the other end is connected to the nut through the light sleeve. connect.

Preferably, the prosthesis cavity is a cavity formed by the pre-embedded prosthesis after the blade is laid and cut and taken out. The prosthesis cavity is used in conjunction with the optical sleeve and is arranged at the end of the optical sleeve along the spanwise direction of the blade.

Preferably, the bolt sleeves and light sleeves are alternately arranged on the connecting end surface of the blade, and a long wedge-shaped strip is laid between the bolt sleeves and the light sleeves.

Preferably, the bolt sleeve is a hollow cylindrical metal sleeve with internal threads, the threaded part of which is connected to one end of the stud bolt, and the bare sleeve is a hollow cylindrical metal sleeve without internal threads, and its inner diameter is larger than that of the stud bolt. the outer diameter.

Preferably, the outer surface of the skin body of each blade segment near the connecting portion has a consistent aerodynamic profile.

Compared with the prior art, the segmented wind power blade of the present invention has the following remarkable technical effects:

1. The segmented wind power blades of the present utility model can realize segmental manufacturing, segmental transportation and on-site assembly of wind turbine blades, greatly reducing transportation and manufacturing costs;

2. The segmented wind power blades of the present invention use studs and nuts to connect the bolt sleeves and light sleeves to realize the connection of the blade segments. The bolt sleeves and light sleeves are arranged alternately to reduce the impact of the prosthesis on the structural strength.

3. The segmented blades of the wind turbine of the present invention adopt the form of embedded metal sleeves. The bolts of this connection form have a lower load coefficient, which is beneficial to the connection strength and reliability of the bolts.

4. The segmented blades of the wind turbine of the present invention use pre-embedded prostheses to form bolt pre-tightening and installation space, which can reduce the damage to the blade composite material structure layer caused by other ways to form the installation space.

Description of drawings

Figure 1. The overall schematic diagram of the segmented wind power blade connection of the present utility model;

Figure 2. End view of segmented wind turbine blade connection;

Figure 3. The spanwise cross-sectional view of the joint of segmented wind turbine blades;

Figure 4. Schematic diagram of laying the inner layer of segmented wind power blades;

Fig. 5. Schematic diagram of segmented wind turbine blade embedded prosthesis.

detailed description

In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

As shown in Figures 1-5, the segmented wind power blade of the present invention includes at least two blade segments i and ii, and the blade segments i and ii are sequentially connected by a connecting bolt group to form a whole blade, and the blade segment i , ⅱ It is made of composite materials, or part of it is made of metal materials, and is composed of a skin body 1, a stud 2, a bolt sleeve 3, a light sleeve 4, and a prosthetic body cavity 5. As shown in Figure 1-3, the bolt sleeves 3 and light sleeves 4 are alternately arranged on the connecting end face of the skin body 1, the prosthesis cavity 5 is arranged at the end of the light sleeve 4, and one end of the stud 2 is connected to the bolt sleeve 3. The other end passes through the light sleeve 4 of the butt joint blade segment, and is connected with the nut in the prosthesis cavity 5 . As shown in Fig. 2, the bolt sleeves 3 and the light sleeves 4 are alternately arranged along the direction of the blade element, so as to reduce the impact on the structural strength of the blade. As shown in Figure 4, the inner laying structure of the segmental wind power blade connection end is composed of bolt sleeve 3, light sleeve 4, long wedge-shaped strip 7, pre-embedded prosthesis cavity 8 and short wedge-shaped strip 9, and the bolt sleeve 3 and light sleeve A long wedge-shaped strip 7 is laid between 4, a pre-embedded prosthesis 8 is laid at the end of the light sleeve, and a short wedge-shaped strip 9 is laid at the other end of the pre-embedded prosthesis 8. As shown in FIG. 5 , the internal thread 11 of the pre-embedded prosthesis 8 uses a stud 2 to fix the pre-embedded prosthesis 8 and the optical sleeve 4 .

Preferably, the outer surface of the skin body 1 of the blade segments i and ii has a consistent aerodynamic shape near the connection part, so as to ensure that after the blade segments are connected, the wind turbine blade as a whole has good aerodynamic properties.

When preparing segmented wind turbine blades, follow the steps below:

(1) Each blade section is manufactured separately, first laying outer layer fiberglass cloth in the blade mould;

(2) Fix the positioning flange at the end of the segmental section of the blade mold, and use the positioning bolts to fix the bolt sleeves at intervals;

(3) Place the pre-embedded prosthesis at the end of the bare prosthesis, use positioning bolts to cooperate with the thread of the pre-embedded prosthesis to fix the light sleeve, and lay short wedge-shaped strips at the end of the pre-embedded prosthesis;

(4) Lay long wedge-shaped strips between the light sleeve and the bolt sleeve;

(5) Lay the inner layer of fiber cloth on the bare sleeve, bolt sleeve, and wedge-shaped strip layer;

(6) After the laying of the above components is completed, the vacuum injection method is used to complete the manufacture of the blade segment shell structure, and the suction surface and pressure surface and the shear web are bonded to form a complete blade segment structure;

(7) After the preparation of the leaf segments is completed, the pre-embedded prosthesis is cut and taken out, and the adjacent leaf segments are connected by studs to form a whole leaf.

The specific embodiments described above further describe the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above descriptions are only specific embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present utility model etc., all should be included within the protection scope of the present utility model.

Claims (6)

1. A segmented wind power blade, comprising at least two blade segments (i, ii), each blade segment (i, ii) is sequentially connected by a connecting bolt group to form a whole blade, characterized in that, The blade segments (i, ii) include skin main body (1), studs (2), bolt sleeves (3), light sleeves (4), prosthesis cavity (5), studs (2 ) are installed in the bolt sleeve (3) and the light sleeve (4), the prosthesis cavity (5) is located at the spanwise end of the light sleeve (4), and the skin body (1) alternately arranges the bolt sleeves (3 ) and light sets (4). 2. The segmented wind turbine blade according to claim 1, characterized in that, the bolt sleeve (3) is pre-embedded on the connecting end face of the skin main body (1), and the light sleeve (4) is correspondingly embedded in the other section On the connection end face of the skin main body (1), one end of the double-ended stud (2) is connected with the bolt sleeve (3), and the other end is connected with the nut (10) through the light sleeve (4). 3. The segmented wind power blade according to claim 1, characterized in that the prosthesis cavity (5) is a cavity formed by the pre-embedded prosthesis (8) after the blade is laid and cut and taken out. The body cavity (5) is used in conjunction with the optical sleeve (4), and is arranged at the end of the optical sleeve (4) along the spanwise direction of the blades. 4. The segmented wind power blade according to claim 1, characterized in that, the bolt sleeves (3) and the light sleeves (4) are alternately arranged on the connecting end face of the blade, and the bolt sleeves (3) and the light sleeves (4) Long wedge-shaped strips (7) are laid therebetween. 5. The segmented wind turbine blade according to claim 2, characterized in that, the bolt sleeve is a hollow cylindrical metal sleeve with internal threads, the threaded part of which is connected to one end of the stud bolt, and the bare sleeve is without The hollow cylindrical metal sleeve of the internal thread has an inner diameter larger than the outer diameter of the stud. 6. The segmented wind power blade according to claim 1, characterized in that, the skin body (1) of each blade segment (i, ii) has a consistent aerodynamic shape on its outer surface near the connecting part.