CN112443451A

CN112443451A - Novel wind power generation blade

Info

Publication number: CN112443451A
Application number: CN202011509064.6A
Authority: CN
Inventors: 张跃
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-12-18
Filing date: 2020-12-18
Publication date: 2021-03-05

Abstract

A novel wind power generation blade comprises a blade shell and a supporting tube, wherein the blade shell comprises a plurality of panels; and the panel of the blade shell is connected with the outer wall of the supporting pipe. On one hand, the integral strength of the supporting tube can be improved, and further, the integral strength of the blade is improved; on the other hand, realize the lightweight, and through designing the structure of blade shell, improve aerodynamic efficiency greatly.

Description

Novel wind power generation blade

Technical Field

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

Background

The blade is one of key parts of the wind generating set, the blade is blown to rotate by taking the wind speed of natural wind as kinetic energy, and the generator is rotated to generate electric power by the kinetic energy of the rotation of the blade. The existing blade is usually made of glass fiber reinforced plastics and other materials, and the whole blade is formed by processing through a die, so that on one hand, the manufacturing process and die processing cost are high, and the blade shell needs to be designed into a curved surface, so that the design difficulty is high; on the other hand, the glass fiber reinforced plastic has heavy weight, the size cannot be designed to be larger, the glass fiber reinforced plastic is not easy to degrade after being used as waste, and the glass fiber is harmful to human bodies.

In addition, the existing blade shell is usually provided with a circular tube in the inner cavity of the shell to increase the strength of the blade, but the circular tube has a weak point of stress at the connecting part, so that the supporting tube is deformed; moreover, the thickness of the blade shell is usually larger than that of the circular tube, so that the diameter of the supporting tube is smaller, the strength is lower, and the overall strength of the blade is reduced.

Moreover, the existing blades cannot be randomly changed into blades with different sizes, the assembly is not flexible, the blades with different sizes and different powers need to be redesigned, and the cost is greatly increased.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provide a novel wind power generation blade which is high in strength, light in self weight, low in cost and high in wind yield.

The technical scheme of the invention is as follows: a novel wind power generation blade comprises a blade shell and a supporting tube, wherein the blade shell comprises a plurality of panels; and the panel of the blade shell is connected with the outer wall of the supporting pipe.

Further, the adjacent panels on at least one side of the blade shell are connected into a whole through an arc-shaped connecting plate at the end far away from the supporting pipe.

Further, adjacent panels on at least one side of the blade shell are connected in a staggered manner at the end far away from the support pipe, so that one panel extends outwards along the connection.

Furthermore, the tail end of the extended panel is provided with a convex part with a pointed or arc structure.

Furthermore, a bending connecting plate is arranged between the adjacent panel and the arc-shaped connecting plate.

Further, the panel is connected with the outer wall of the supporting tube through a mounting plate.

Further, the face plate is a plane sandwich plate.

Furthermore, the blade shell and the supporting tube are of a segmented structure and comprise a blade root section, a blade middle section and a blade tip section; the front end of the blade root section is provided with a connecting joint; the joint of adjacent sections is provided with a section joint.

Further, the supporting tube is of a taper tube structure.

Further, the panel is a stainless steel sandwich material.

The invention has the beneficial effects that: on one hand, the integral strength of the supporting tube can be improved, and further the integral strength of the blade is improved; on the other hand, realize the lightweight, and through designing the structure of blade shell, improve aerodynamic efficiency greatly.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a cross-sectional view taken along line A-A of the embodiment of FIG. 1;

FIG. 3 is a cross-sectional view taken along line B-B of the embodiment of FIG. 1;

FIG. 4 is a cross-sectional view taken along line C-C of the embodiment of FIG. 1;

FIG. 5 is a cross-sectional view taken along line D-D of the embodiment of FIG. 1;

FIG. 6 is an enlarged schematic view of section I of the embodiment of FIG. 1;

FIG. 7 is an enlarged schematic view of section II of the embodiment of FIG. 3;

FIG. 8 is an enlarged schematic view of section III of the embodiment shown in FIG. 3.

The attached drawings indicate the following:

1. a blade shell; 2. supporting a tube; 3. a panel; 4. reinforcing ribs; 5. connecting a joint; 6. closing the plate; 7. a segmented joint; 8. an arc-shaped connecting plate; 9. a convex portion; 10. bending the connecting plate; 11. a leaf root segment; 12. a midship section of the blade; 13. a tip section; 14. a notch; 21. mounting a plate; 31. and (5) supplementing plates.

Detailed Description

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

As shown in fig. 1 to 8: a novel wind power generation blade comprises a blade shell 1 and a supporting tube 2, wherein the blade shell 1 comprises a plurality of panels 3; the panel 3 of the blade housing 1 is connected to the outer wall of the support tube 2.

The scheme has the following advantages: the panel of the blade shell is connected with the outer wall of the supporting tube instead of connecting the supporting tube to the inner cavity of the blade shell, so that on one hand, the supporting tube is easily deformed due to the weak stress point of the connecting part of the supporting tube when the supporting tube is wrapped by the blade shell; on the other hand, the design structure of the invention can improve the strength of the supporting pipe because the thickness of the blade shell is usually larger than that of the supporting pipe, which causes the diameter of the supporting pipe to be smaller and the strength to be lower.

Specifically, the blade shell 1 with the support tube 2 comprises a blade root section 11, a blade middle section 12 and a blade tip section 13, and the blade shell 1 is of a segmented structure and is convenient to transport and assemble. Each blade shell 1 is formed by splicing at least four panels 3. Preferably, the panel 3 is a sandwich panel, and light weight can be realized while strength is ensured; the lighter the blades are, the easier the blades are blown by wind to rotate for power generation, namely breeze can generate power, annual power generation hours are greatly increased, and the blades are light in weight and can be made to be larger in size. And the panel is the plane battenboard, compares current curved plate body, not only is convenient for transport, and is changeed the manufacturing moreover, and cost greatly reduced, can say that, this embodiment has adopted lightweight material to make the blade, has overcome the restriction of material itself in the aspect of the shape simultaneously again.

The sandwich board of the embodiment comprises a board layer, a sandwich layer and a board layer. Wherein the sandwich layer can be a honeycomb core, a pipe core, a corrugated core and the like. Preferably, the sandwich layer comprises a plurality of hollow pipes, the upper end and the lower end of each hollow pipe are flanged, and the hollow pipes are welded, preferably in brazed connection, with the plate layers through the flanges. The sandwich board of the embodiment is preferably made of stainless steel, the service life of the stainless steel is almost infinite, and when the sandwich board is used for wind power generation of a wind power generator set, the sandwich board can be arranged at any power demand terminal with poor wind power, so that excellent investment return and great carbon reduction are realized, and the sandwich board is expected to become a final solution for protecting climate of human beings.

In this embodiment, the number of the middle segments 12 in the middle segment may be multiple, the number of the splicing segments in this embodiment may be selected according to the requirement, and the longer the length is, the more the splicing segments are. The front end of the blade root section 11 is provided with a connecting joint 5 connected with the support pipe 2, the connecting joint 5 is preferably a flange plate, and rib plates are arranged between the flange plate and the support pipe 2 at intervals so as to enhance the connecting strength of the connecting joint 5. The blade root section 11 is provided with a sealing plate 6 at the connecting side of the connecting joint 5 for completely sealing or semi-sealing the front end of the blade root section 11, and preventing rainwater or other particles from entering. The joint of the adjacent sections of the blade shell 1 is provided with a segmented joint 7, the segmented joint 7 is preferably a flange plate, the flange plate is arranged on the supporting tube 2, after the flange plates between the connected sections are in butt joint, the flange plate penetrates through threaded holes in the flange plate through bolts to realize connection and fixation, and the flange plate is wrapped in the blade shell. In addition, when the flange plates of the adjacent sections are connected, in order to facilitate bolt screwing, the blade shell 1 can be provided with a notch 14, and the space of the notch is required to meet the bolt installation of the flange plates, so that the rapid installation between the blade shells 1 of the adjacent sections is realized. After the installation is finished, the notch can be sealed to prevent water or other particles and the like from entering. Or the notch is not sealed, and even if water enters, the water can flow out from the notch side. It can be understood that the flange between the adjacent sections of the invention can be arranged outside the blade shell besides being arranged inside the blade shell, so that the threaded holes are exposed outside the blade shell, and bolts can be screwed outside without forming gaps. Or the flange plate is wrapped in the blade shell, a gap is not needed to be arranged, people can enter the supporting pipe to screw the bolt, and therefore the appearance is not affected, and the novel blade structure is suitable for large-scale blade structures.

In this embodiment, each blade shell 1 preferably includes four panels 3, and the panels 3 are planar sandwich panels, and the four panels 3 are connected to the outer wall of the support tube 2 through the mounting plate 21. The four mounting plates 21 are respectively disposed on two sides of the top and two sides of the bottom of the support tube 2, and are symmetrically disposed. The top wall of the mounting plate 21 is parallel to the panel 3, and the side wall of the mounting plate 21 is fixedly connected with the panel 3. If the mounting portion is not provided, the support pipe 2 and the panel 3 are discontinuous and flat, and the strength of the support pipe is reduced, and by providing the mounting plate 21, the surface continuity and flatness between the support pipe 2 and the panel 3 can be increased.

In this embodiment, the connection mode of the four panels of the middle segment 12 is as follows: the adjacent panel of blade shell 1 one side is keeping away from that one end of stay tube 2 and is linked into an organic whole through arc connecting plate 8, connects promptly and is connected with arc connecting plate 8 between two panels 3 that are located the homonymy in stay tube 2 top and bottom, links two panels through arc connecting plate 8 and becomes an organic whole. By arranging the arc-shaped connecting plate 8, on one hand, the aerodynamic appearance factor is considered, namely the aerodynamic performance of the arc-shaped structure is good, and the power generation efficiency is improved; on the other hand, the existing blade shell is usually a curved surface and is complex to process, and if the shell is of a sandwich structure, the shell is not easy to be set into the curved surface, the processing difficulty is high, and the cost is high; therefore, the present embodiment preferably uses a sandwich panel of a planar structure to form the blade shell; however, if the sandwich plates with the plane structures are connected with each other, the butt joint is not easy, the butt joint rear edges are sharp, the pneumatic performance can be influenced, the problems can be solved by arranging the arc-shaped connecting plate 8, namely, the structure can not only ensure the simplicity of the middle-section processing of the sandwich plates, but also ensure the pneumatic efficiency. Furthermore, a bending connecting plate 10 is arranged between the adjacent panel and the arc-shaped connecting plate, and the bending connecting plate 10, the panel 3 and the arc-shaped connecting plate 8 are welded into a whole. By arranging the bending connecting plates 10, on one hand, the connecting area of the panels can be increased, if the panels are connected with the arc-shaped connecting plates, the connecting area is small, the connecting strength is low, and the connecting strength can be improved when the panels are connected with the bending plates; on the other hand, the bending resistance of the arc-shaped connecting plate can be increased, and the stability of the arc-shaped connecting plate is ensured. In addition, the bending connecting plate is designed into a bending structure, so that the bending connecting plate is conveniently connected with the two panels in a matched mode, and a connecting gap is reduced.

In this embodiment, the adjacent panels on the other side of the blade shell 1 are connected in a staggered manner at the end away from the support tube 2, so that a portion of one panel extends outwards along the connection. Namely: one panel is wider than the other, e.g., the one connected to the top of the support tube is wider, and when the two panels are connected, the wider panel extends out of the other. The two sides of the blade are provided with different structures, namely, one side is provided with the arc-shaped connecting plate, and the other side is provided with the staggered connecting structure, so that the windward side and the leeward side of the blade are asymmetric, and the improvement of the lift force and the power generation efficiency of the blade is facilitated. Wherein, the end of the panel with small width is designed into an inclined plane so as to be in seamless joint with the panel with large width; or the end of the panel with small width is additionally provided with a patch 31 with an inclined surface, and the panel is connected with another panel through the patch 31. The tail end of the extended panel is provided with a pointed or arc-shaped convex part 9. The cross-sectional shape of the protrusion 9 is preferably triangular, and the apex of the triangle is a pointed end or an arc-shaped end. By additionally arranging the convex part 9, the aerodynamic form factor is also considered, so that the aerodynamic efficiency can be improved, and the noise can be reduced.

In this embodiment, the blade tip section 13 may also be formed by splicing at least four panels, and may be designed to have a tapered structure by using a planar sandwich panel, and the tip portion is formed at the tail end. The tip section 13 functions as a transition to reduce drag and noise.

In this embodiment, the blade root section 11 is formed by splicing at least four panels, and the inner cavity of the blade shell can be further provided with reinforcing ribs 4, so that the strength is further improved.

In this embodiment, the size of the blade shell 1 is gradually reduced from the blade root section 11 to the blade tip section 13, so that the overall structure of the support tube 2 of this embodiment is a conical tube structure, which may be a conical tube structure or a polygonal conical tube structure.

In the present embodiment, the sizes of the blade middle section 12 and the blade tip section 13 are preferably designed to be standard sizes, and different blade root sections (i.e. heads) can be replaced to realize blades with different powers. For example, the middle blade section comprises 3 sections, and small-size blade root sections can be selected and spliced to form a small-size wind power generation blade; or the middle blade section comprises 7 sections, the large-size blade root section needs to be selected and spliced to form the large-size wind power generation blade. Therefore, the design structure is flexible to assemble, can be changed into blades with different sizes at any time, and does not need to be additionally designed.

In summary, in the embodiment, on one hand, the overall strength of the supporting tube can be improved, and further, the overall strength of the blade can be improved; on the other hand, realize the lightweight, and through designing the structure of blade shell, improve aerodynamic efficiency greatly.

Claims

1. A novel wind power generation blade comprises a blade shell and a supporting tube, wherein the blade shell comprises a plurality of panels; the method is characterized in that: and the panel of the blade shell is connected with the outer wall of the supporting pipe.

2. The novel wind power blade of claim 1, wherein: the adjacent panels on at least one side of the blade shell are connected into a whole through an arc-shaped connecting plate at the end far away from the supporting pipe.

3. The new wind power blade according to claim 1 or 2, characterized in that: adjacent panels on at least one side of the vane housing are offset joined at the end remote from the support tube such that a panel extends outwardly from the joint.

4. The novel wind power blade of claim 3, wherein: the tail end of the extended panel is provided with a convex part with a pointed or arc structure.

5. The novel wind power blade of claim 2, wherein: and a bending connecting plate is arranged between the adjacent panel and the arc-shaped connecting plate.

6. A novel wind power blade according to claim 1 or 2 or 4 or 5, wherein: the panel is connected with the outer wall of the supporting tube through the mounting plate.

7. A novel wind power blade according to claim 1 or 2 or 4 or 5, wherein: the panel is a plane sandwich panel.

8. A novel wind power blade according to claim 1 or 2 or 4 or 5, wherein: the blade shell and the supporting tube are of segmented structures and comprise a blade root section, a blade middle section and a blade tip section; the front end of the blade root section is provided with a connecting joint; the joint of adjacent sections is provided with a section joint.

9. A novel wind power blade according to claim 1 or 2 or 4 or 5, wherein: the supporting tube is of a taper tube structure.

10. A novel wind power blade according to claim 1 or 2 or 4 or 5, wherein: the panel is a stainless steel sandwich material.