CN110617175A - Wind power generation blade - Google Patents

Abstract

A blade for wind power generation, comprising a blade wing and a blade stem, the blade wing is a cavity structure spliced by a plurality of sandwich panels and arc plates, and the blade wing includes a blade root section and a blade middle section connected in sequence and the tip section; the stem is arranged in the cavity of the blade wing along the direction from the root section to the tip section, and the outer wall of the stem is in contact with the inner wall of the sandwich panel catch. On the one hand, the present invention uses lightweight materials to manufacture blades, and at the same time overcomes the limitation of the material itself in terms of shape; on the other hand, it can improve the overall strength of the blades, and can strengthen the stiffness and stability at the splicing section; Moreover, the blades are light in weight, can generate electricity in a breeze, and can be installed in any electricity demand terminal with bad wind.

Description

wind power blade

technical field

The invention relates to the technical field of wind power generation, in particular to a blade for wind power generation.

Background technique

Blades are one of the key components of wind turbines. The blades are driven to rotate by the wind speed of the natural wind of the gas, and the kinetic energy of the blades rotates the generator to generate electricity. In order to make full use of wind energy to generate higher power generation efficiency, the length of the blade needs to be longer. However, the longer the blade, the more difficult the processing, the more complicated the process, and it is difficult to guarantee the quality of the blade; moreover, most of the blades are manufactured as a whole, and the transportation cost is high. , and difficult to transport. In order to solve this problem, many blade manufacturers divide the blade into two or more sections along the length direction during manufacture, and splice the multi-section blades into a whole blade after being transported to the destination.

In addition, the longer the length of the blade, the lower the strength will be greatly, especially the segmented splicing structure of the blade, the strength of the splicing part is weak, which will easily cause the blade to break. In order to increase the strength of the blade, the conventional technical means is to install a reinforcing plate in the inner cavity of the blade to support the blade. However, setting the reinforcing plate can only strengthen the blade locally to avoid the collapse of the hollow blade. It still cannot enhance the overall stability of the blade, nor can it Strengthen the overall stiffness and stability of the segmented blades.

Furthermore, when the existing blades need to be replaced, they need to be replaced as a whole, or when a certain part is damaged, the blades will be scrapped as a whole, which will greatly increase the cost and affect the work.

Contents of the invention

The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art and provide a wind power generation blade with light weight, low cost, stable reliability, convenient replacement and high structural strength.

The technical solution of the present invention is: a blade for wind power generation, including a blade wing and a blade stem, the blade wing is a cavity structure formed by splicing a plurality of sandwich panels and arc plates, and the blade wing includes sequentially connected The leaf root section, the leaf middle section and the leaf tip section; the leaf stem is arranged in the cavity of the leaf wing along the direction from the leaf root section to the leaf tip section, and the outer wall of the leaf stem is in contact with the leaf tip section. The inner walls of the sandwich panels are connected.

Further, the leaf stem is a segmented structure.

Further, the leaf stem is a conical tube structure.

Further, the leaf stem is a conical tube structure or a polygonal conical tube structure.

Further, the end of the blade root section is provided with a connecting piece.

Further, the middle section of the leaf is a multi-segment spliced structure.

Further, the sandwich panel and the arc panel are connected by welding.

Further, the sandwich panel is welded to the arc plate through a supplementary plate.

Further, the sandwich panel is a stainless steel sandwich material.

Further, reinforcing ribs are also provided in the cavity of the blade.

Further, the reinforcing ribs are respectively connected with the sandwich panel and the leaf stem.

Beneficial effects of the present invention: on the one hand, lightweight materials are used to manufacture blades, and at the same time, the limitation of the shape of the material itself is overcome; on the other hand, the overall strength of the blades can be improved, and the stiffness at the splicing section can be strengthened and stability; and the blades are light in weight, can generate electricity in a breeze, and can be installed in any power demand terminal with poor wind.

Description of drawings

Fig. 1 is the three-dimensional structure schematic diagram of the embodiment of the present invention;

Fig. 2 is the front view of the embodiment shown in Fig. 1;

Fig. 3 is the A-A direction sectional view of the embodiment shown in Fig. 2;

Fig. 4 is the B-B direction sectional view of the embodiment shown in Fig. 2;

Fig. 5 is the enlarged schematic view of part I of the embodiment shown in Fig. 4;

Fig. 6 is the enlarged schematic diagram of part II of the embodiment shown in Fig. 4;

Fig. 7 is a schematic structural diagram of the connector of the embodiment shown in Fig. 1 .

Explanation of the accompanying drawings:

1. Leaf wing; 2. Leaf stem; 3. Sandwich panel; 4. The first arc plate; 5. The second arc plate; 6. Supplement plate; 7. Connector;

11. Root segment; 12. Middle segment; 13. Tip segment; 14. Long side; 15. Short side.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figures 1 to 7: a blade for wind power generation, including a blade wing 1 and a blade stem 2, the blade wing 1 is a cavity structure formed by splicing a plurality of sandwich panels 3 and arc plates 4, and The blade wing 1 includes a root section 11, a middle section 12 and a tip section 13 connected in sequence; the stem 2 is arranged on the wing along the direction from the root section 11 to the tip section 12. 1, and the outer wall of the stem 2 is in contact with the inner wall of the sandwich panel 3.

The above scheme has the following advantages: (1) The blade is a spliced structure, which is convenient for transportation and assembly; (2) The blade wing is a cavity structure composed of multiple sandwich panels and arc panels, and the sandwich panel is used to ensure the strength. At the same time, it can also greatly improve the lightweight; and the lighter the blade, the easier it is to be blown by the wind to rotate and generate electricity, that is, the breeze can generate electricity, and the annual power generation hours are greatly increased; (3) By setting the leaf stem, the overall blade can be strengthened Strength, and the ability to enhance stiffness and stability at the splice.

Specifically, the sandwich panel 3 is a plane sandwich panel, which is easier to manufacture than the existing curved panel body, and the manufacturing cost is greatly reduced. It can be said that this embodiment uses lightweight materials to manufacture the blades, and at the same time Overcome the limitations of the material itself in terms of shape. The plane sandwich panels are connected through the arc panels.

Wherein, the middle leaf section 12 can be a multi-segment splicing structure, and the number of splicing segments in this embodiment can be selected according to requirements, and the longer the length, the more splicing segments.

Since the size of the blade gradually decreases from the root section 11 to the tip section 13, the stem 2 of this embodiment has a conical tube structure, which may be a conical tube structure or a polygonal conical tube structure. The leaf stem 2 is a tapered tube structure, which is supported and connected in the cavity of the blade wing 1, which can improve the overall strength of the blade wing, instead of only local reinforcement like the reinforcing plate; on the other hand, it can strengthen the stiffness and stability.

Further, the leaf stem is a segmented structure. The segmented structure means that the blade stem 2 is set in each of the blade root section 11, the middle blade section 12 and the blade tip section 13, instead of a whole one running through the blade wings. When a certain section needs to be replaced, only It is only necessary to dismantle the section and the leaf stem in the section as a whole, and there is no need to replace the entire leaf wing, which not only saves costs, but also greatly improves work efficiency.

Preferably, the length of the stem of each section of the leaf wing satisfies: when the adjacent sections are connected, the stems are just butted together. Wherein, the length of the leaf stem may be equal to the length of each leaf wing, or may be greater than or less than the length of each leaf wing, as long as it can be docked with the leaf stem in the adjacent section. In order to facilitate the connection between each leaf stem, the end of the previous leaf stem will match the size of the head of the latter leaf stem. The reason why the present embodiment is provided with a leaf stem in each section of the leaf wing is to facilitate quick connection. Since the leaf stems are arranged inside the blade wings, the adjacent leaf stems are preferably connected by welding or plugging, so that the assembly speed can be accelerated.

Further, the sandwich panel 3 in this embodiment is made of metal, including a ply, a sandwich layer, and a ply. Wherein, the sandwich layer may be honeycomb core, pipe core, corrugated core and the like. Preferably, the sandwich layer includes several hollow tubes, the upper and lower ends of the hollow tubes are flanged, and the hollow tubes are welded, preferably brazed, to the plate layer through the flanging.

The wall of the existing vane is usually curved, and the processing is relatively complicated, and if it is a sandwich structure, it is not easy to set it into a curved shape, so the processing is difficult and the cost is high. Therefore, in this embodiment, the blade wing is preferably made of a sandwich panel with a planar structure. However, if the sandwich panels of planar structure are connected, it is not easy to butt, and the edges after butt are relatively sharp. In order to solve this problem, in this embodiment, the arc plate 4 is provided at the joint of adjacent sandwich panels. In addition, when the outer wall of the leaf stem 2 is in contact with the inner wall of the sandwich panel 3 , it can be connected directly or through a patch 5 .

A preferred embodiment of the sandwich panel connection mode of the present invention is as follows:

As shown in Figure 5 and Figure 6: except for the blade root section 11, the blade middle section and the blade tip section are formed by splicing four planar sandwich panels 3, so that the cross-sectional shape of the blade wing is quadrilateral, and the adjacent two sides of the quadrilateral One acute-angled side is a long side 14, and the other two adjacent acute-angled sides are short sides 15, and an obtuse angle is formed between the long side and the short side. Wherein, the first arc plate 4 is arranged between two adjacent long sides and between two adjacent short sides, for example, when connecting between two adjacent long sides, the two long sides are not aligned, and It is a dislocation connection, and the lengths of the two long sides are different, so that the first arc plate 4 is conveniently arranged for the dislocation connection. Wherein, the first arc plate 4 is hook-shaped, including a first arc surface and a straight surface, one end of the first arc surface is welded to one side of a long side, and one end of the straight face is welded to a side of the other long side, and The first arc surface 41 constitutes the edge of the vane, and a cavity is formed between the two long sides 14 and the first arc plate 4 . In addition, the connection between adjacent short sides 15 is the same as that of the long sides, which will not be repeated here. The long side 14 and the short side 15 are welded together with the second arc plate 5, wherein, the two sides of the second arc plate 5 are welded with a patch 6, and a part of the patch 6 extends to the inner cavity of the blade wing, and The leaf stems 2 are welded into one.

The number of sandwich panels of the blade root section 11 is more than that of other spliced sections. For example, in this embodiment, 8 to 10 sandwich panels are preferably spliced to form the blade root section 11 to form a polyhedral structure. The end of the blade root section 11 is provided with a joint 7 for connecting other components. The end of the connector 7 is welded into one body with the leaf stem 2 . Preferably, the connecting head 7 is a flange structure.

In this embodiment, both the sandwich panel 3 and the stem 2 are made of stainless steel. The service life of stainless steel is almost infinite. When used in wind turbines for wind power generation, it can be installed in any electricity demand terminal with poor wind power to achieve excellent return on investment and huge carbon reduction. It is expected to become the ultimate solution for human beings to protect the climate. .

In this embodiment, in addition to setting the blade stem in the cavity of the blade wing, reinforcing ribs can also be provided for further reinforcement. The reinforcing ribs are respectively welded to the sandwich panel and the leaf stem, and the reinforcing ribs may be distributed transversely and/or longitudinally.

The following is a preferred embodiment of the blade assembly method of the present invention, which mainly includes the following steps:

S101: splicing and installing the blade root section 11, the blade middle section 12 and the blade tip section 13;

Specifically, as shown in Figure 2: assume that the blade wing in this embodiment has a total of 8 sections, namely A~H sections, A section is the blade tip section, H section is the blade root section, and B~G sections are the blade middle section. When these eight sections are spliced on site, each section is welded in turn to form an overall blade structure. Wherein, each section is welded by a plurality of sandwich panels 3 and arc plates 4, and a leaf stem is welded in the inner cavity, the length of the leaf stem is the same as or close to that of each section of the leaf wing, and the leaf stem 2 and the patch plate 6 welded into one.

S102: After each segment is spliced into one, the mobile robot enters into the leaf stem, and welds between adjacent leaf stems, so that the leaf stems form a whole, thereby completing the leaf wing assembly.

Specifically, the mobile robot is preferably a robot car, and the welding method is preferably laser welding.

When a certain section of the leaf wing is damaged, the section of the leaf wing together with the inner stem can be directly removed, and other sections are not affected.

This embodiment adopts the welding method, which can improve the overall strength. It can be understood that plug-in connection can also be used. For example, plug-in connection can be used between the sections with smaller blade cross-sections, such as setting tenons between the middle blades of the rear section and between the middle blade and the blade tip. The mortise and tenon structure realizes insertion.

To sum up, on the one hand, this embodiment uses lightweight materials to manufacture the blades, and at the same time overcomes the limitations of the material itself in terms of shape; on the other hand, it can improve the overall strength of the blades and strengthen the joints. Excellent stiffness and stability; and the blades are light in weight, can generate electricity in a breeze, and can be installed in any power demand terminal with poor wind.

Claims (10)

1. A wind power generation blade, characterized in that: it comprises a blade and a stem, the blade is a cavity structure spliced by a plurality of sandwich panels and arc plates, and the blade comprises sequentially connected leaf root section, leaf middle section and leaf tip section; the leaf stem is arranged in the cavity of the leaf wing along the direction from the leaf root section to the leaf tip section, and the outer wall of the leaf stem is in contact with the The inner walls of the sandwich panels meet. 2. The blade for wind power generation according to claim 1, wherein the blade stem is a segmented structure. 3 . The blade for wind power generation according to claim 1 , wherein the blade stem is a tapered tube structure. 4 . 4. The blade for wind power generation according to claim 3, characterized in that: the blade stem is a conical tube structure or a polygonal conical tube structure. 5. The wind power generation blade according to claim 1, characterized in that: the end of the blade root section is provided with a connecting piece. 6. The wind power generation blade according to claim 1, wherein the sandwich panel and the arc panel are connected by welding. 7 . The wind power generation blade according to claim 6 , wherein the sandwich plate is welded to the arc plate through a patch plate. 8 . 8. The wind power generation blade according to claim 1, characterized in that: the sandwich panel is a stainless steel sandwich material. 9. The wind power generation blade according to claim 1, characterized in that: a reinforcing rib is further provided in the cavity of the blade. 10 . The wind power generation blade according to claim 9 , wherein the reinforcing ribs are respectively connected with the sandwich panel and the blade stem. 11 .