Wind turbine impeller structure and wind driven generator

Abstract

The invention provides a wind turbine impeller structure and a wind driven generator. The wind turbine impeller structure comprises a main shaft, the impellers are arranged in the circumferential direction of the main shaft, each impeller comprises a plurality of connecting sections which are sequentially connected, the connecting sections are connected in a bent mode to form a hollow area, the two connecting sections located at the ends are connected with the main shaft, the connecting sections are integrally formed, and the connecting sections and the main shaft are integrally formed. The problem that in the prior art, a blade is poor in structural strength and reliability is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation, and in particular to a wind turbine impeller structure and a wind turbine generator. Background Art

[0002] At present, the impeller structure of vertical axis wind turbines, especially symmetrical vertical axis wind turbines, is usually composed of multiple blades, connecting rods and impeller connecting parts. These parts are usually designed in a split style and then assembled by mechanical connection (such as bolts, pins, etc.) or adhesive connection (using glue or epoxy resin, etc.). However, this connection method has the following problems:

[0003] 1. Structural strength and reliability issues: Mechanical and adhesive connections are prone to wear, corrosion and stress concentration under long-term wind conditions, especially in harsh offshore environments, which can lead to reduced strength at the connection points and affect the stability and reliability of the entire wind turbine.

[0004] 2. Assembly complexity and cost: The split impeller structure requires complex assembly in the factory or on site, which not only increases production costs, but also prolongs installation time and reduces efficiency. Especially for offshore wind power projects, the assembly cost and time cost are even higher.

[0005] 3. Difficulty of maintenance and overhaul: Once there is a problem with the connection, it needs to be disassembled and overhauled, which is extremely difficult in the case of offshore wind power. It not only requires high maintenance costs, but may also affect the normal operation of the wind turbine.

[0006] Therefore, the impeller structure of the symmetrical vertical axis wind turbine in the prior art has obvious limitations in terms of structural strength, assembly efficiency, maintenance cost, etc. Summary of the invention

[0007] The main purpose of the present invention is to provide a wind turbine impeller structure and a wind turbine generator to solve the problem of poor structural strength and reliability of blades in the prior art.

[0008] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, there is provided a wind turbine impeller structure, comprising a main shaft; a plurality of impellers, the impellers being arranged along the circumference of the main shaft, the impellers comprising a plurality of connecting segments connected in sequence, the connecting segments being bent and connected to form a hollow area, the two connecting segments located at the ends being connected to the main shaft, and the connecting segments and the connecting segments and the main shaft being integrally formed.

[0009] Furthermore, the impellers are arranged at equal intervals along the circumference of the main shaft.

[0010] Furthermore, the impellers are symmetrically arranged along the circumference of the main shaft.

[0011] Furthermore, the main shaft includes a first connecting portion and a second connecting portion which are axially spaced apart from each other, and the first connecting portion and the second connecting portion are respectively connected to two connecting sections located at the ends.

[0012] Furthermore, an acute angle is formed between two adjacent connecting segments; or two adjacent connecting segments, or a connecting segment and the main axis are vertically connected.

[0013] Furthermore, all the connecting sections include: a first connecting section, which is connected to the main shaft; a second connecting section, one end of which is bent and connected to the first connecting section; and a third connecting section, which is connected to one end of the second connecting section away from the first connecting section, and the third connecting section is connected to the main shaft.

[0014] Furthermore, in a direction away from the main axis, the first connecting segment extends obliquely upward, the second connecting segment extends longitudinally, and in a direction away from the main axis, the third connecting segment extends obliquely downward, the top end of the first connecting segment is connected to the top of the second connecting segment, and the bottom end of the third connecting segment is connected to the bottom of the second connecting segment.

[0015] Further, the first connecting segment and the third connecting segment both extend transversely in the radial direction of the main shaft, and the second connecting segment extends longitudinally and is connected to radial outer ends of the first connecting segment and the third connecting segment.

[0016] Furthermore, the second connecting segment has a first extending segment and a second extending segment, the first extending segment is located at the top of the second connecting segment and is higher than the top of the first connecting segment, and the second extending segment is located at the bottom of the second connecting segment and is lower than the bottom end of the third connecting segment.

[0017] Furthermore, the impeller also includes a wing plate, which is rotatably sleeved on the outside of the connecting section and can adjust the angle of attack of the airfoil by rotating.

[0018] According to another aspect of the present application, a wind turbine generator is provided, comprising the above-mentioned wind turbine impeller structure.

[0019] By applying the technical solution of the present invention, the structural strength and overall stability of the impeller structure are greatly improved by adopting an integrated design. The one-piece molding process avoids the mechanical connection and adhesive connection that may exist between the blades, connecting rods and impeller connecting parts in the traditional impeller design, and eliminates the potential failure risk of these connection points, thereby ensuring the long-term reliable operation of the impeller structure under complex working conditions. At the same time, the integrated design also effectively reduces the number of structural parts, simplifies the manufacturing and assembly process, reduces production costs, and improves production efficiency. Moreover, since the entire impeller structure is molded in one step, the internal stress distribution is more uniform, avoiding structural damage caused by local stress concentration, and further enhancing the wind resistance and service life of the impeller. The hollow area is formed by multiple connecting sections formed in one piece, which not only improves the rigidity of the impeller, reduces the use of materials, and reduces manufacturing costs, but also the design of the hollow area can effectively reduce the noise during the operation of the wind turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0021] Figure 1 A schematic structural diagram of a wind turbine impeller structure according to a first embodiment of the present invention is shown;

[0022] Figure 2 A schematic diagram showing a wind turbine impeller structure having three impellers is shown;

[0023] Figure 3 A schematic structural diagram of a wind turbine impeller structure according to a second embodiment of the present invention is shown.

[0024] The above drawings include the following reference numerals:

[0025] 10. Main shaft; 20. Impeller; 21. First connecting section; 22. Second connecting section; 221. First extending section; 222. Second extending section; 23. Third connecting section; 24. Wing plate. DETAILED DESCRIPTION

[0026] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0027] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0028] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0029] In order to solve the problem of poor structural strength and reliability of blades in the prior art, the present invention provides a wind turbine impeller structure and a wind turbine generator, wherein the wind turbine generator has the following wind turbine impeller structure.

[0030] Embodiment 1

[0031] like Figure 1 and Figure 2 A wind turbine impeller structure shown includes a main shaft 10 and multiple impellers 20. The impellers 20 are arranged along the circumference of the main shaft 10. The impellers 20 include multiple connecting segments connected in sequence. The connecting segments are bent and connected to form a hollow area. Two connecting segments located at the ends are connected to the main shaft 10. The connecting segments and the connecting segments and the main shaft 10 are integrally formed.

[0032] By adopting an integrated design, the structural strength and overall stability of the impeller structure are greatly improved. The one-piece molding process avoids the mechanical and adhesive connections that may exist between the blades, connecting rods and impeller connecting parts in the traditional impeller design, eliminating the potential failure risk of these connection points, thereby ensuring the long-term reliable operation of the impeller structure under complex working conditions. At the same time, the integrated design also effectively reduces the number of structural parts, simplifies the manufacturing and assembly process, reduces production costs, and improves production efficiency. Moreover, since the entire impeller structure is molded in one go, its internal stress distribution is more uniform, avoiding structural damage caused by local stress concentration, and further enhancing the wind resistance and service life of the impeller 20. The hollow area is formed by multiple connecting sections formed in one piece, which not only improves the rigidity of the impeller 20, reduces the use of materials, and reduces manufacturing costs, but also the design of the hollow area can effectively reduce the noise during the operation of the wind turbine.

[0033] Preferably, the impellers 20 are arranged at equal intervals along the circumference of the main shaft 10. This evenly distributed design allows the wind turbine to be more evenly stressed during rotation, reduces vibration and noise caused by uneven stress, and prolongs the service life of the wind turbine.

[0034] Preferably, the impellers 20 are symmetrically arranged along the circumference of the main shaft 10. The symmetrical design further improves the balance of the wind turbine, reduces the dynamic imbalance during operation, and enables the wind turbine to maintain a good operating state under various wind speed conditions.

[0035] When an even number of impellers 20 are provided, the impellers 20 can be equally spaced and symmetrically distributed in the circumferential direction, thereby achieving the above two effects. When an odd number of impellers 20 are provided, the impellers 20 are preferably arranged equally spaced in the circumferential direction to ensure balance. In actual design, the number of impellers 20 can be adjusted as needed, so that the solidity and aerodynamic performance of the impellers 20 can be adjusted by adjusting the number of impellers 20.

[0036] In this embodiment, the main shaft 10 includes a first connection portion and a second connection portion which are spaced apart in the axial direction, and the first connection portion and the second connection portion are respectively connected to two connection sections located at the ends. In this way, the connection positions between the upper and lower connection sections and the main shaft 10 can be at a certain distance, and the specific size of the distance can be set as needed, thereby optimizing the connection method between the impeller 20 and the main shaft 10, improving the reliability and efficiency of the connection, and reducing the maintenance cost.

[0037] In this embodiment, three connecting segments are provided, specifically, all connecting segments include a first connecting segment 21, a second connecting segment 22 and a third connecting segment 23, the first connecting segment 21 is connected to the main shaft 10; one end of the second connecting segment 22 is bent and connected to the first connecting segment 21; the third connecting segment 23 is connected to the end of the second connecting segment 22 away from the first connecting segment 21, the third connecting segment 23 is connected to the main shaft 10, and the first connecting segment 21 and the third connecting segment 23 have the same bending direction relative to the second connecting segment 22. The above segmented form can make the impeller 20 more convenient in the manufacturing and transportation process, and can better adapt to different terrains and environmental conditions during installation, and at the same time, the integrated setting form can still ensure the overall structural strength of the impeller 20.

[0038] The first connecting section 21 and the third connecting section 23 of this embodiment are both arranged in an inclined manner. Specifically, in the direction away from the main axis 10, the first connecting section 21 extends upwardly in an inclined manner, the second connecting section 22 extends longitudinally, and in the direction away from the main axis 10, the third connecting section 23 extends downwardly in an inclined manner. The top end of the first connecting section 21 is connected to the top end of the second connecting section 22, and the bottom end of the third connecting section 23 is connected to the bottom end of the second connecting section 22. In this way, an acute angle is formed between two adjacent connecting sections, and the cooperation of the three connecting sections makes the impeller 20 as a whole roughly form a fan-shaped profile, so that the impeller 20 can play a role similar to that of a blade. When facing different wind directions, the impeller 20 can capture wind energy more effectively, use wind energy more effectively, improve the wind energy utilization rate of the wind turbine, and at the same time reduce the sensitivity of the wind turbine to wind speed, and improve the power generation capacity of the wind turbine under low wind speed conditions.

[0039] Embodiment 2

[0040] The difference from the first embodiment is that the form of the connecting section is different.

[0041] As Figure 3 shown, in this embodiment, three connecting segments are still provided. However, between the connecting segments, the first connecting segment 21 and the third connecting segment 23 both extend horizontally along the radial direction of the main shaft 10, and the second connecting segment 22 extends longitudinally and is connected to the outer radial ends of the first connecting segment 21 and the third connecting segment 23, thereby forming a perpendicular connection between adjacent two connecting segments and between the connecting segment and the main shaft 10, making the impeller 20 form a C-shaped structural form, expanding the wind-catching area of the impeller 20, enabling the impeller 20 to adjust more flexibly when facing wind direction changes, and improving the wind direction adaptability of the wind turbine.

[0042] In this embodiment, except for the middle segment, the two ends of the second connecting segment 22 have a first extended segment 221 and a second extended segment 222. That is to say, the second connecting segment 22 is longitudinally divided into three parts: the first extended segment 221, the middle segment, and the second extended segment 222 from top to bottom. Among them, the middle segment is the main part. The first extended segment 221 is located at the top of the second connecting segment 22 and is higher than the top end of the first connecting segment 21. The second extended segment 222 is located at the bottom of the second connecting segment 22 and is lower than the bottom end of the third connecting segment 23. The design of the extended segment increases the wind-catching area of the impeller 20, improves the wind energy capture efficiency of the wind turbine, and at the same time, by adjusting the length and angle of the extended segment, the performance of the wind turbine under different wind speed conditions can be optimized.

[0043] In this embodiment, the first connecting segment 21 is in the form of a circular cross-section. Of course, it can also be set in other shapes. At the same time, the impeller 20 further includes wing plates 24. The wing plates 24 are rotatably sleeved outside the connecting segment. In this way, the angle of attack of the airfoil can be adjusted by rotation, so as to realize the conditions of the rotational aerodynamic force of the impeller 20 and the pressure on the main shaft 10, and reduce the ultimate aerodynamic load of the wind turbine and the friction force of the rotation of the impeller 20. Considering the position relationship, in this embodiment, the wing plates 24 are arranged on the first connecting segment 21 and the third connecting segment 23. Of course, they can also be adjusted on other connecting segments as long as the above effects can be achieved. At the same time, the wing plates 24 of this embodiment can also be arranged on the connecting segments in the first embodiment as needed.

[0044] It should be noted that the "multiple" in the above embodiments refers to at least two.

[0045] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0046] 1. Solve the problem that the structural strength and reliability of the blades in the prior art are poor;

[0047] 2. It avoids the mechanical and adhesive connections that may exist between the blades, connecting rods and impeller connecting parts in traditional impeller designs, eliminates the potential failure risks of these connection points, and thus ensures the long-term reliable operation of the impeller structure under complex working conditions;

[0048] 3. Simplified the manufacturing and assembly process, reduced production costs, and improved production efficiency;

[0049] 4. The stress distribution is more uniform, avoiding structural damage caused by local stress concentration, and further enhancing the wind resistance and service life of the impeller;

[0050] 5. The number of impellers can be adjusted as needed, so that the solidity and aerodynamic performance of the impellers can be adjusted by adjusting the number of impellers;

[0051] 6. By rotating and adjusting the angle of attack of the airfoil, the conditions of impeller rotation aerodynamic force and pressure on the main shaft are achieved, thereby reducing the ultimate aerodynamic load of the wind turbine and the friction of impeller rotation.

[0052] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0053] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0054] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A wind turbine impeller structure, characterized in that: include: Spindle (10); A plurality of impellers (20) are arranged along the circumference of the main shaft (10), the impeller (20) comprising a plurality of connecting sections connected in sequence, each of the connecting sections being bent and connected to form a hollow area, two of the connecting sections located at the ends being connected to the main shaft (10), and each of the connecting sections and the connecting sections and the main shaft (10) being integrally formed.

2. The wind turbine impeller structure according to claim 1, characterized in that: The impellers (20) are arranged at equal intervals along the circumference of the main shaft (10).

3. The wind turbine impeller structure according to claim 1, characterized in that: The impellers (20) are symmetrically arranged along the circumference of the main shaft (10).

4. The wind turbine impeller structure according to claim 1, characterized in that: The main shaft (10) comprises a first connecting portion and a second connecting portion which are axially spaced apart from each other, wherein the first connecting portion and the second connecting portion are respectively connected to the two connecting sections located at the ends.

5. The wind turbine impeller structure according to claim 1, characterized in that: An acute angle is formed between two adjacent connecting segments; or Two adjacent connecting segments and the connecting segment and the main shaft (10) are vertically connected.

6. The wind turbine impeller structure according to claim 1, characterized in that: All said connecting sections include: A first connecting section (21), the first connecting section (21) being connected to the main shaft (10); A second connecting section (22), one end of the second connecting section (22) being bent and connected to the first connecting section (21); A third connecting section (23), the third connecting section (23) being connected to an end of the second connecting section (22) away from the first connecting section (21), and the third connecting section (23) being connected to the main shaft (10).

7. The wind turbine impeller structure according to claim 6, characterized in that: In a direction away from the main axis (10), the first connecting section (21) extends obliquely upward, the second connecting section (22) extends longitudinally, and in a direction away from the main axis (10), the third connecting section (23) extends obliquely downward, the top end of the first connecting section (21) is connected to the top of the second connecting section (22), and the bottom end of the third connecting section (23) is connected to the bottom of the second connecting section (22).

8. The wind turbine impeller structure according to claim 6, characterized in that: The first connecting section (21) and the third connecting section (23) both extend transversely along the radial direction of the main shaft (10), and the second connecting section (22) extends longitudinally and is connected to the radial outer ends of the first connecting section (21) and the third connecting section (23).

9. The wind turbine impeller structure according to claim 8, characterized in that: The second connecting section (22) comprises a first extending section (221) and a second extending section (222), wherein the first extending section (221) is located at the top of the second connecting section (22) and is higher than the top of the first connecting section (21), and the second extending section (222) is located at the bottom of the second connecting section (22) and is lower than the bottom end of the third connecting section (23).

10. The wind turbine impeller structure according to claim 1, characterized in that: The impeller (20) further comprises a wing plate (24), wherein the wing plate (24) is rotatably sleeved on the outside of the connecting section and can adjust the angle of attack of the airfoil by rotating.

11. A wind turbine generator, characterized in that: The wind turbine impeller structure comprises the wind turbine impeller structure according to any one of claims 1 to 10.

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