A rotating wind turbine blade with an eccentric shaft

Abstract

A rotating wind turbine blade with an eccentric shaft comprises a frame, a shaft, a leaf plate and an elastic component, wherein the shaft is fixed on the frame; the leaf plate is eccentrically rotatably connected to the shaft through the elastic component. When the wind turbine blade of the present invention is subjected to wind pressure, the side with a larger leaf plate is subjected to greater force. When the wind pressure is greater than the torsion of the spring, the leaf plate will open automatically to release the excess wind pressure, thereby reducing the force on the entire blade and protecting the wind turbine tower and the main structure. The leaf plate is adaptively rotatable, does not require electric drive, has a simple structure, is light in weight, greatly reduces maintenance costs, and is widely distributed.

Description

Technical Field

[0001] The invention relates to a wind turbine blade, in particular to a rotating wind turbine blade with an eccentric shaft. Background Art

[0002] Blades are one of the key components of wind turbines. They mainly use the wind speed of natural wind as kinetic energy to make the blades rotate, and the kinetic energy of the rotating blades turns the generator to generate electricity.

[0003] The main defects of traditional wind turbine blades are as follows: (1) Traditional blades are all sealed and covered structures. When encountering strong winds, the blades will be subjected to great impact force. In addition, the length and width of the blades are large and they are easily broken when encountering strong winds. Therefore, the strength of the blades needs to be designed to be very high, which greatly increases the design difficulty and the cost. In the case of low wind speeds, wind turbines are relatively difficult to start. (2) The existing blade design is complex and needs to consider the streamlined design and sealing design of the blades, which greatly increases the cost. (3) The existing blades are mainly suitable for strong wind power generation. It is difficult to generate electricity when the wind pressure is low. Therefore, it is not suitable for power generation at any location in the world. It can only be concentrated in wind farms for power generation. It is also not suitable for power generation at all times. When encountering strong winds, the generator will automatically shut down. Summary of the invention

[0004] The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art and provide a rotating wind turbine blade with an eccentric shaft which is widely distributed, has strong impact resistance, is low in cost, and can utilize light wind.

[0005] The technical solution of the present invention is: a rotating wind turbine blade with an eccentric shaft, comprising a frame, a shaft, a leaf plate and an elastic component, wherein the shaft is fixed on the frame; and the leaf plate is eccentrically rotatably connected to the shaft through the elastic component.

[0006] Furthermore, the elastic component is arranged between the shaft and the page plate, and the page plate is controlled by the elastic component to adaptively open and close in one direction or two directions around the shaft.

[0007] Furthermore, there is one shaft, which is connected to the frame via a connecting seat. Two springs are simultaneously sleeved on one shaft. The page plate is rotatably connected to the shaft via the page plate seat, and one spring is triggered to act through rotation, while the other spring is not acted, thereby achieving two-way opening and closing.

[0008] Furthermore, the elastic component includes a first spring and a second spring which are sleeved on the same shaft. One end of the two springs is limited, and the other ends extend out of a trigger angle. They rotate with the page plate by being triggered by the page plate. When the page plate drives the first spring to rotate clockwise, the second spring is limited by the second limiting member; when the page plate drives the second spring to rotate counterclockwise, the first spring is limited by the first limiting member.

[0009] Furthermore, end seats are provided at both ends of the shaft, and notches are provided on the end seats. The first limiting member and the second limiting member are arranged in opposite directions, and the first limiting member and the second limiting member are respectively clamped at the edge of the notch of each end seat to achieve limiting.

[0010] Furthermore, there are at least two shafts, the number of the page plates seats corresponds to the number of the shafts, a spring is sleeved on each shaft, and the springs of different shafts respectively control the page plates to open and close in different directions.

[0011] Further, the shaft is connected to the 7 / 12~9 / 12 position of the page plate. Preferably, the rotation node of the shaft and the page plate is located at the 7 / 12~9 / 12 position from the upper end of the page plate.

[0012] Further, the shaft is connected to the 2 / 3 position of the page plate. Preferably, the rotation node of the shaft and the page plate is located at the 2 / 3 position from the upper end of the page plate, that is, at the 1 / 3 position from the upper end of the page plate.

[0013] Furthermore, the frame includes a leaf stem and a leaf frame, the leaf stem is arranged along the length direction of the wind turbine blade, the leaf frame is arranged along the width direction of the wind turbine blade, the leaf frame includes a plurality of spaced-apart cross frames, each cross frame is provided with a plurality of leaf plates rotating around an axis; the leaf frame is connected in the direction in which the size of the leaf stem gradually decreases, and the part in which the size of the leaf stem increases extends along the leaf frame.

[0014] Furthermore, the leaf stems and cross frames are both truss structures; and the leaf boards are flat boards or corrugated boards.

[0015] Beneficial effects of the present invention:

[0016] (1) By rotating the leaf plate eccentrically, the forces on both sides of the leaf plate can be uneven. When subjected to wind pressure, the side with a larger force on the leaf plate is subjected to greater force. When the wind pressure is greater than the torsion of the spring, the leaf plate will open automatically to release the excess wind pressure, thereby reducing the force on the entire blade and protecting the wind turbine tower and host structure.

[0017] (2) The leaf plate of the present invention is adaptively rotated, does not require electric drive, has a simple structure, is light in weight, and greatly reduces maintenance costs;

[0018] (3) By designing the leaf stem and leaf skeleton into a truss structure, the overall weight of the blade can be greatly reduced, the strength is improved, and the installation speed is fast;

[0019] (4) The present invention is particularly suitable for small and medium-sized wind power generation by setting the leaf plates to adaptively flip according to the wind pressure. When encountering strong winds, the leaf plates open to greatly reduce the impact force on the blades. It can be said that the present invention is particularly suitable for installing wind power systems at any location in the world, and breezes can be used, that is, both breezes and strong winds can generate electricity, and electricity can be generated at all times, such as 24 hours a day and 365 days a year. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the page plate in the closed state of embodiment 1 of the present invention;

[0021] Figure 2 It is a schematic diagram of the three-dimensional structure of the page board in the open state of the embodiment 1 of the present invention;

[0022] Figure 3 yes Figure 1 A side view of the illustrated embodiment 1;

[0023] Figure 4 yes Figure 1 An enlarged schematic diagram of the connection of the leaf plates of the embodiment 1 is shown;

[0024] Figure 5 yes Figure 4 A further enlarged schematic diagram of Example 1 is shown;

[0025] Figure 6 yes Figure 5 A further enlarged schematic diagram of Example 1 is shown.

[0026] Description of the accompanying drawings:

[0027] 1. Leaf stem; 2. Leaf frame; 3. Axle; 4. Leaf plate; 5. Spring; 6. Limit pin; 21. Transverse truss; 22. Longitudinal rod; 31. Connecting seat; 41. Leaf plate seat; 51. Limiting angle; 52. Triggering angle; 211. Tilt rod; 212. Horizontal rod; 411. Connecting sleeve. DETAILED DESCRIPTION

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] Example 1

[0030] like Figures 1 to 3 Shown is a rotating wind turbine blade with an eccentric shaft, comprising a frame, a shaft, a leaf plate and an elastic component.

[0031] In this embodiment, the frame includes a leaf stem 1 and a leaf frame. The leaf stem 1 is a truss structure, preferably a triangular truss or a quadrilateral truss to improve strength, and is a cone with gradually decreasing size. The horizontal bottom surface of the leaf stem 1 is connected to the leaf frame. The leaf frame 2 includes a plurality of transverse trusses 21 arranged at intervals, that is, the leaf stem 1 is arranged along the length direction of the wind turbine blade, and the transverse truss 21 is arranged along the width direction of the wind turbine blade. The transverse truss 21 is a large-span triangular truss, which is composed of two inclined rods 211 and a horizontal rod 212 to form a triangular structure, and a support rod is provided between the inclined rod and the horizontal rod. In order to further improve the strength, a plurality of longitudinal rods 22 arranged at intervals are also connected between the horizontal rods 212 of adjacent transverse trusses to form an integral leaf frame structure with the transverse truss 21. The leaf stem 1 and a plurality of transverse trusses 21 are welded together to form a complete frame structure, which can greatly reduce the overall weight of the blade and improve the strength.

[0032] The horizontal rod 212 of the transverse truss is connected to the shaft 3, specifically: the shaft 3 is a short shaft, fixedly connected to the horizontal rod 212 through the connecting seat 31, the shaft 3 passes through the connecting seat 31 and is fixed to the connecting seat, the page plate 4 is rotatably connected to the shaft 3 through the page plate seat 41, the page plate seat 41 and the page plate 4 are welded or screwed, and a connecting sleeve 411 for rotatably connecting to the shaft 3 is extended from the page plate seat 41, which can rotate around the shaft. A spring 5 is sleeved on the shaft, and both ends of the spring extend with a stop angle, which are a limit stop angle 51 and a trigger stop angle 52. The limit stop angle 51 extending from one end is used to limit the rotation of the spring 5 at this end; the trigger stop angle 52 extending from the other end extends toward the direction of rotation of the page plate 4, that is, extends to one side of the page plate seat 41. When the page plate 4 and the page plate seat 41 rotate around the shaft 3, the page plate seat 41 will trigger the trigger stop angle 52 of the spring 5 during the rotation process, causing the trigger stop angle to twist, thereby causing the spring 5 to generate elasticity and control the adaptive opening and closing of the page plate 4.

[0033] like Figure 4~Figure 6As shown: In this embodiment, multiple leaf plates 4 are rotatably connected to the horizontal rod of each transverse truss 21, that is, multiple leaf plates in each row are commonly connected to the horizontal rod 212 of the same transverse truss, and two separately arranged shafts 3, leaf plate seats 41, and first springs 1# and second springs 2# are provided between each leaf plate 4 and the horizontal rod 212. The first spring 1# is sleeved on one shaft, and the second spring is sleeved on another shaft. The leaf plate 4 is rotatably connected to the shaft through one leaf plate seat, and is rotatably connected to the other shaft through another leaf plate seat. Among them, the first spring 1# controls the leaf plate 4 to rotate clockwise around one shaft, and the rotation angle is 0~180°, and the second spring 2# controls the leaf plate 4 to rotate counterclockwise around another shaft, and the rotation angle is 0~180°. In order to realize the bidirectional rotation of the page plate 4, the trigger angles of the first spring 1# and the second spring 2# are set in different directions, that is, the page plate seat 41 is set between the trigger angles 52 of the two springs 5, the trigger angle of one spring is set at the front side of the page plate seat, and the other trigger angle is set at the rear side of the page plate seat, so that no matter the page plate seat rotates forward or backward, only one of the trigger angles is triggered, and the other does not take effect, thereby realizing the bidirectional rotation of the page plate. For example, when the page plate rotates backward, the trigger angle of the first spring located at the rear side of the page plate seat will be triggered, so that the spring generates torque, driving the page plate to rotate clockwise, and when the page plate is fully opened, it automatically stops rotating. After the wind force decreases, the page plate automatically rebounds under the elastic force of the spring.

[0034] Preferably, the trigger angle 52 is a bent structure and is bent toward the page plate seat 41. The connection seat 31 extends a limit pin 6 on the side where the spring limit angle 51 is located. The limit pin is arranged on one side of the limit angle to limit the rotation of the limit angle. The limit angle is also a bent structure.

[0035] In this embodiment, the leaf plate 4 is eccentrically connected to the shaft 3 through an elastic component. That is, the rotation node of the leaf plate 4 is not set at the center position, but should be biased to the center position. In this embodiment, the rotation node is preferably set at the 2 / 3 position of the leaf plate 4, specifically: the leaf plate seat 41 is set at the 2 / 3 position of the leaf plate 4, and the two leaf plate seats 41 are arranged at intervals, and are respectively rotatably connected around the shaft 3 arranged on the connecting seat. The connecting sleeve on one leaf plate seat is set to the left, and the connecting sleeve on the other leaf plate seat is set to the right, so as to facilitate the smooth rotation of the leaf plate. When the leaf plate is placed vertically, the rotation node is located at a position 2 / 3 of the upper end of the leaf plate. The eccentric setting of the leaf plate can make the two sides of the leaf plate unevenly stressed; when subjected to wind pressure, the larger side of the leaf plate is subjected to greater force. When the force is greater than the force value of the torsion spring, the leaf plate will open automatically, release the excess wind pressure, reduce the force on the entire blade, and protect the wind power tower and the main structure; the device does not require electric drive, has a simple structure, and greatly reduces maintenance costs.

[0036] In this embodiment, the leaf frame 2 is used to support the strength of all leaf plates 4, and after the leaf stem 1 is connected to the leaf frame 2, it also extends along the leaf frame 2, and the extended part is the largest part, and the leaf stem is connected to the leaf frame in the direction of gradually decreasing size. The root of the leaf stem is connected to the wind power system, such as the hub, preferably three wind power blades are connected to the hub, and they are symmetrically arranged. When the leaf stem drives the leaf plate to rotate, the leaf plate 4 will open and close under the action of wind.

[0037] The leaf board 4 of this embodiment is a flat board or a corrugated board, preferably a corrugated board, which can greatly improve the strength of the leaf board to resist wind pressure.

[0038] The working principle of this embodiment is as follows: when the front of the leaf plate 4 is subjected to a large wind force, the first spring 1# takes effect and drives the leaf plate 4 to rotate clockwise; specifically, when the wind pressure is less than the minimum elastic force of the first spring 1#, the leaf plate remains closed; when the wind pressure is greater than the maximum elastic force of the first spring 1#, the leaf plate is fully opened; when the wind pressure is between the minimum elastic force and the maximum elastic force of the first spring 1#, the first spring 1# controls the leaf plate to open a certain angle, and controls the leaf plate to gradually open or close according to the wind pressure. In this way, when the wind pressure begins to increase, the leaf plate begins to be blown open to reduce the force strength of the leaf plate, so that a part of the wind passes through the gap opened by the leaf plate to buffer the torsion of the leaf plate; when the wind pressure exceeds the maximum elastic force of the first spring 1#, the leaf plate is fully opened and automatically stops rotating, so that the wind does not pass through the leaf plate but completely passes through the gap after the leaf plate rotates, thereby greatly reducing the force on the leaf plate.

[0039] When the wind force on the back of the leaf plate is relatively large, the second spring 2# takes effect, driving the leaf plate to rotate counterclockwise. The specific principle is the same as above and will not be repeated here.

[0040] When encountering a whirlwind, different leaf plates of the same blade can be opened in different directions by the first spring 1# and the second spring 2# when subjected to wind forces in different directions.

[0041] Example 2

[0042] The difference from the first embodiment is that the arrangement structure of the elastic component is different.

[0043] The elastic component of this embodiment is to set the first spring and the second spring on the same shaft, rather than separately. The shaft is longer than the shaft of the first embodiment, and the two springs are sleeved on the same shaft. One end of the two springs is limited by the limit angle, and the other end is connected to one side of the page plate seat through the trigger angle. Two connecting sleeves are extended from both ends of the page plate seat to be rotatably connected to the shaft. The page plate seat is set between the trigger angles of the two springs, so that one of the trigger angles is triggered during bidirectional rotation to make the corresponding spring take effect.

[0044] The shaft is provided with an end seat on the side close to the connecting sleeve, and a notch with a certain thickness is provided on the end seat. Limit pins are provided on the two connecting sleeves respectively. The openings of the two end seats are arranged in opposite directions. The two limit pins extend along the notches respectively so as to be stuck at the edge of the notch to achieve limiting. For example, one notch is provided on the front side of one end seat, and the limit pin in the notch is stuck at the lower end of the notch. When the page plate moves backward, the limit pin can be driven to move backward until it is stuck at the upper end of the notch and stops moving. Another notch is provided on the rear side of the other end seat, and the limit pin in the notch is stuck at the lower end of the notch. When the page plate moves forward, the limit pin can be driven to move forward until it is stuck at the upper end of the notch and stops moving.

[0045] By arranging the two springs on the same shaft instead of arranging them separately, the structure can be greatly simplified and the compactness of the structure can be improved on the basis of being able to realize the bidirectional action of the leaf plate.

[0046] The other structures are the same as those in Embodiment 1 and will not be described in detail here.

[0047] Example 3

[0048] The difference from the first embodiment is that the two sets of springs in the first embodiment can be arranged into the same structure, so that the leaf plate can only rotate in one direction, such as only forward or backward.

[0049] Example 4

[0050] On the basis of Example 1, an adjustment part for adjusting the spring torque can be further provided at one end of the connecting seat connected to the shaft, and the elasticity of the spring can be adjusted according to needs. The adjustment part is connected to the spring and can rotate with the spring. The adjustment part is preferably an adjustment nut or an adjustment bolt.

[0051] Example 5

[0052] The leaf frame of this embodiment can also be designed into multiple grid structures through transverse and longitudinal connecting rods, and a page plate is arranged in each grid. The page plate is eccentrically arranged through the axis and rotates along the axis in the grid.

[0053] It should be noted that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the protection scope of the present invention.

Claims

1. A rotating wind turbine blade with an eccentric shaft, comprising a frame, a shaft, a leaf plate and an elastic component, wherein the shaft is fixed on the frame; characterized in that: The leaf plate is eccentrically rotated and connected to the shaft through an elastic component; the frame includes a leaf stem and a leaf frame, the leaf stem is arranged along the length direction of the wind turbine blade, and the leaf frame is arranged along the width direction of the wind turbine blade. The leaf frame includes a plurality of spaced-apart cross frames, each of which is provided with a plurality of leaf plates rotating around the axis, and a plurality of leaf plates in each row are connected together to a horizontal rod of the same cross frame; the leaf plates in each row have the same size; the shaft is connected to the 7 / 12~9 / 12 position of the leaf plate, so as to make the two sides of the leaf plate be subjected to uneven force. When subjected to wind pressure, the larger side of the leaf plate is subjected to greater force. When the wind pressure is greater than the torque of the elastic component, the leaf plate will open automatically to release excess wind pressure.

2. The rotating wind turbine blade with an eccentric shaft according to claim 1, characterized in that: The elastic component is arranged between the shaft and the page plate, and the page plate is controlled to open and close adaptively in one direction or two directions around the shaft through the elastic component.

3. The rotating wind turbine blade with an eccentric shaft according to claim 2, characterized in that: There is one shaft, which is connected to the frame via a connecting seat. Two springs are sleeved on one shaft at the same time. The page plate is rotatably connected to the shaft via the page plate seat, and the rotation triggers one spring to act while the other spring does not act, thereby achieving two-way opening and closing.

4. The rotating wind turbine blade with an eccentric shaft according to claim 3, characterized in that: The elastic component includes a first spring and a second spring sleeved on the same shaft. One end of the two springs is limited, and the other end extends out of a trigger angle. The two springs are triggered by the page plate and rotate with the page plate. When the page plate drives the first spring to rotate clockwise, the second spring is limited by the second limiting piece; when the page plate drives the second spring to rotate counterclockwise, the first spring is limited by the first limiting piece.

5. The rotating wind turbine blade with an eccentric shaft according to claim 4, characterized in that: End seats are provided at both ends of the shaft, and notches are provided on the end seats. The first limiting member and the second limiting member are arranged in opposite directions, and the first limiting member and the second limiting member are respectively clamped at the edge of the notch of each end seat to achieve limiting.

6. The rotating wind turbine blade with an eccentric shaft according to claim 2, characterized in that: There are at least two shafts, the number of the page plate seats corresponds to the number of the shafts, a spring is sleeved on each shaft, and the springs of different shafts respectively control the page plates to open and close in different directions.

7. The rotating wind turbine blade with an eccentric shaft according to claim 1, characterized in that: The shaft is connected to the 2 / 3 position of the page plate.

8. The rotating wind turbine blade with an eccentric shaft according to claim 1, characterized in that: The leaf skeleton is connected to the direction in which the leaf stem gradually decreases in size, and the portion in which the leaf stem increases in size extends along the leaf skeleton.

9. The rotating wind turbine blade with an eccentric shaft according to claim 8, characterized in that: The leaf stems and cross frames are both truss structures; the leaf boards are flat boards or corrugated boards.

Images