A spring assembly for bidirectionally rotating leaves and a wind turbine blade

Abstract

A spring assembly and a wind turbine blade for bidirectionally rotating leaves, wherein the spring assembly includes a first spring and a second spring disposed between a fixed body and the leaves; the first spring and the second spring are disposed on the same shaft, and when the leaves drive the second spring to rotate forward, the front of the first spring is limited by a first limiting member; when the leaves drive the first spring to rotate backward, the rear of the second spring is limited by a second limiting member. The present invention also includes a wind turbine blade including a spring assembly. On the one hand, the present invention can realize bidirectional adaptive rotation of the leaves on the basis of simplifying the structure and reducing the size of the elastic component; on the other hand, when used for wind power generation blades, it can greatly improve the force strength of the leaves and the efficiency of wind power generation.

Description

Technical Field

[0001] The invention relates to a bidirectional opening and closing elastic component, in particular to a bidirectional rotating leaf spring assembly and a wind turbine blade. Background Art

[0002] Existing two-way spring hinges are usually double-axis hinges, that is, two shafts are set, each shaft is equipped with a spring, and the spring is hidden in the hinge. One spring is used to control the door or window to open and close toward the front, and the other spring is used to control the door or window to open and close toward the back, thus forming a double-open spring hinge structure. However, this structure has the following defects: (1) Two shafts need to be set, and the two shafts are arranged side by side, and a hinge is arranged between the shafts, which greatly increases the size of the entire two-way spring hinge, the structure is not compact, and additional parts are added, resulting in a complex structure, increased costs, and an increase in the gap between the door frame and the door body; (2) The spring trigger angle and the door body connection structure are complex,

[0003] In addition, blades are one of the key components of wind turbines. They rotate mainly through the wind speed of natural wind, which is the kinetic energy of the wind. The kinetic energy of the blade rotation turns the generator to generate electricity. Traditional wind turbine blades have the following main defects: (1) It is relatively difficult to start the wind turbine when the wind speed is low, and the wind power utilization efficiency of the wind turbine is not high when the wind speed is high; (2) Due to the large area of ​​the blades, the blades will be subjected to great impact force under strong winds, which affects the strength of the blades and can easily break in severe cases. Summary of the invention

[0004] The object of the present invention is to overcome the above-mentioned deficiencies of the prior art and to provide a spring assembly for bidirectionally rotating leaves and a wind turbine blade with a simple and compact structure.

[0005] The technical solution of the present invention is:

[0006] A spring assembly for a bidirectionally rotating leaf of the present invention comprises a first spring and a second spring arranged between a fixed body and the leaf; the first spring and the second spring are arranged on the same shaft, and when the leaf drives the second spring to rotate forward, the front of the first spring is limited by a first limiting member; when the leaf drives the first spring to rotate backward, the rear of the second spring is limited by a second limiting member.

[0007] Furthermore, when the front of the first spring is limited by the first limit piece, the second spring generates torque to control the page to open and close adaptively; when the rear of the second spring is limited by the second limit piece, the first spring generates torque to control the page to open and close adaptively in the opposite direction, so that the forces of the first spring and the second spring are not offset.

[0008] Furthermore, one end of the first spring and the second spring is respectively provided with a spring triggering angle extending toward the leaf, and the leaf is arranged between the two spring triggering angles. The leaf triggers any spring triggering angle to drive the corresponding spring to rotate.

[0009] Furthermore, the other ends of the first spring and the second spring are respectively provided with extended spring limit angles for limiting the rotation of the spring at the ends.

[0010] Furthermore, the first limit member is arranged above the spring triggering angle of the first spring; and the second limit member is arranged below the spring triggering angle of the second spring.

[0011] Furthermore, the shaft body is connected to the shaft seat, and the shaft seat is provided with two areas. The first spring and the second spring are respectively provided in the two areas and sleeved on the shaft body, and the leaf piece is connected between the two areas.

[0012] Furthermore, a first partition and a second partition are provided in the middle or near the middle of the shaft seat, and the shaft seat is divided into the two areas by the partition. The first limit member is provided on the first partition, and the second limit member is provided on the second partition. The leaf is rotatably connected to the part of the shaft between the two partitions.

[0013] Furthermore, the first limiting member and the second limiting member are both limiting pins extending horizontally along the partition.

[0014] Furthermore, the spring triggering angle is a bent structure.

[0015] A wind turbine blade of the present invention comprises a blade frame, the blade frame comprises at least one grille, a leaf plate is arranged in the grille, and a spring group of bidirectionally rotating leaf plates according to any of the above items is arranged between the leaf plate and the grille, which can control the leaf plate to open and close bidirectionally along the grille.

[0016] Beneficial effects of the present invention:

[0017] (1) By providing a first limiting member and a second limiting member to limit the two springs in both directions, when the leaf rotates in one direction, it is only acted upon by one spring, and when the leaf rotates in the opposite direction, it is only acted upon by the other spring, that is, the interaction forces of the two springs will not be offset, thereby achieving bidirectional rotation of the leaf;

[0018] (2) By arranging two springs on the same shaft, compared with arranging springs on two shafts separately, the structure can be greatly simplified, the cost can be reduced, and the width of the entire elastic component can be reduced, so that the arrangement between the leaf and the fixed body is more compact;

[0019] (3) By arranging two springs coaxially and combining them with the first limiter and the second limiter, the bidirectional adaptive rotation of the leaf can be achieved on the basis of simplifying the structure and reducing the size of the elastic component;

[0020] (4) By placing the leaf between two spring triggering angles, whether the leaf rotates forward or backward, one of the springs will be triggered to generate torque, and the spring limit angle is limited, so the structure is greatly simplified and no additional parts are required for triggering.

[0021] (5) By designing the wind turbine blades into a two-way opening and closing structure, on the one hand, it is extremely easy to start the wind turbine when the wind speed is low, thereby improving the efficiency of wind power generation and being suitable for installing wind power systems anywhere in the world, including the seaside, on the mountain, on the roadside, etc.; on the other hand, when the wind speed is very high, the blades can open automatically and will not be subjected to a large impact force, greatly improving the force strength of the blades, thereby increasing their service life and reducing maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of the three-dimensional structure of the spring assembly of Embodiment 1 of the present invention (the pages are not completely drawn);

[0023] Figure 2 Schematic diagram of the leaf plate structure of a wind turbine blade in Embodiment 1 of the present invention;

[0024] Figure 3 yes Figure 2 The AA-direction enlarged structural schematic diagram of the embodiment 1 is shown;

[0025] Figure 4 yes Figure 2 The BB-axis enlarged structural schematic diagram of the embodiment 1 is shown;

[0026] Figure 5 yes Figure 2 A schematic diagram of the leaf panel and window frame connection structure of Example 1 is shown.

[0027] Description of the accompanying drawings:

[0028] 1. Fixed body; 2. Leaf; 3. First spring; 4. Second spring; 5. Shaft; 6. First stopper; 7. Second stopper; 8. Shaft seat; 9. Spring triggering angle; 10. Spring stopper angle; 11. Connecting seat; 21. Connecting rod; 81. First baffle, 82. Second baffle; 83. First area; 84. Second area;

[0029] 101. Leaf plate; 102. Window rod; 103. Window frame; 104. Leaf seal; 105. Leaf center frame. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] Example 1

[0032] like Figure 1 As shown: a spring group for bidirectionally rotating a leaf, comprising a first spring 3 and a second spring 4 arranged between a fixed body 1 and a leaf 2; the first spring and the second spring are arranged on the same shaft 5, when the leaf drives the second spring 4 to rotate forward, a second stopper 7 is arranged behind the second spring 4; when the leaf drives the first spring 3 to rotate backward, a first stopper 6 is arranged in front of the first spring 3, so that no matter the leaf moves forward or backward, one spring always acts and the other does not act.

[0033] The above scheme has the following advantages: (1) by arranging the first limiter and the second limiter to limit the two springs in both directions respectively, when the leaf rotates in one direction, it is only acted upon by one spring, and when the leaf rotates in the opposite direction, it is only acted upon by the other spring, that is, the interaction forces of the two springs will not be offset, thereby realizing the bidirectional rotation of the leaf; (2) by arranging the two springs on the same shaft, compared with arranging the springs on two shafts separately, it can greatly simplify the structure, reduce the cost, and reduce the width of the entire elastic component, so that the arrangement between the leaf and the fixed body is more compact; (3) by arranging the two springs coaxially and combining them with the first limiter and the second limiter, on the basis of simplifying the structure and reducing the size of the elastic component, it can also realize the bidirectional adaptive rotation of the leaf.

[0034] The leaf piece of the present invention can be an openable leaf plate arranged on a wind power generation blade, or a door leaf (i.e. a door body) or a window leaf (i.e. a window body) on a building. The fixed body can be a rod body rotatably connected to the leaf plate.

[0035] In this embodiment, an axle seat 8 is provided between the fixed body 1 and the leaf 2. A first partition 81 and a second partition 82 are provided in the middle of the axle seat 8. A first area 83 is formed between the first partition 81 and an end plate at one end of the axle seat 8. A second area 84 is formed between the second partition and an end plate at the other end of the axle seat. Holes for passing the axle body are provided on both the first partition and the second partition. The axle body 5 is connected to the axle seat 8 through two partitions, and the axle body 5 is fixedly connected to the axle seat 8. The first spring 3 is sleeved on the part of the axle body in the first area 83, and the second spring 4 is sleeved on the part of the axle body in the second area 84. The leaf 2 is rotatably connected to the part of the axle body provided between the two partitions through the connecting rod 21. When an external force pushes the leaf 2, the leaf 2 rotates around the axle body 5 through the connecting rod 21. The fixed body 1 is fixedly connected to the axle seat 8 through the connecting seat 11.

[0036] In this embodiment, one end of the first spring 3 and the second spring 4 are respectively provided with a spring triggering angle 9 extending toward the leaf 2, and the leaf 2 is arranged between the two spring triggering angles 9, that is, the spring triggering angle of the first spring 3 is arranged at the rear side of the leaf, and the first limiter 6 is arranged at the front side of the spring triggering angle 9; the spring triggering angle of the second spring 4 is arranged at the front side of the leaf 2, and the second limiter 7 is arranged at the rear side of the spring triggering angle 9. The corresponding spring triggering angle 9 is triggered by the leaf 2 moving forward or backward to drive the corresponding spring to rotate. For example, when the external force pushes the leaf to move forward, the spring triggering angle 9 on the second spring 4 is triggered by the leaf, and the leaf drives the spring triggering angle to move forward, thereby driving the second spring 4 to twist; while the spring triggering angle 9 of the first spring 3 is not triggered, and is limited by the first limiter 6, so the first spring does not work. Similarly, when the external force pushes the leaf to move backward, the spring triggering angle on the first spring is triggered by the leaf, and the second spring does not work.

[0037] In this embodiment, the spring triggering angle 9 is a bent structure or other special-shaped structure, as long as it can be triggered by the leaf piece. In this embodiment, it is preferably an L-shaped structure, and its horizontal section extends outward to a position that can be triggered by the leaf piece.

[0038] In this embodiment, the first limiter 6 is disposed above the spring trigger angle of the first spring 3, and is used to limit the first spring 3 from rotating forward, so that the first spring does not generate torque; the second limiter 7 is disposed below the spring trigger angle of the second spring 4, and is used to limit the second spring 4 from rotating backward, so that the second spring does not generate torque. Preferably, both the first limiter 6 and the second limiter 7 are limit pins extending horizontally along the partition, the limit pins are perpendicular to the partition, and the limit pins extend in the direction of the corresponding spring trigger angle 9.

[0039] In this embodiment, the other ends of the first spring 3 and the second spring 4 are respectively provided with extended spring limit angles 10 for limiting the rotation of the spring at the end. The spring limit angle 10 extends vertically along the spring and is limited by moving to the back plate of the shaft seat 8, thereby preventing the spring from rotating at the end and realizing the elastic function of the spring.

[0040] The working principle of this embodiment is as follows: when an external force pushes the leaf piece 2 to rotate forward, the leaf piece 2 touches the spring triggering angle 9 of the second spring 4, driving the spring triggering angle 9 to rotate forward so that the second spring 4 generates a torque to control the adaptive opening and closing of the leaf piece 2, while the spring triggering angle of the first spring 3 is not triggered and its front is limited by the first limiter 6, and does not take effect; similarly, when an external force pushes the leaf piece 2 to rotate backward, the leaf piece touches the spring triggering angle 9 of the first spring 3, driving the spring triggering angle 9 to rotate backward so that the first spring 3 generates a torque to control the adaptive opening and closing of the leaf piece 2, while the spring triggering angle 9 of the second spring 4 is not triggered and its front is limited by the second limiter 7, and does not take effect, so that the acting forces of the first spring 3 and the second spring 4 are not offset.

[0041] The following is a specific description using a wind turbine blade as an example:

[0042] like Figure 2~Figure 5 As shown in the figure: a wind power generation system is usually provided with at least three wind turbine blades, each wind turbine blade includes a blade frame, a blade stem and a leaf plate. The blade stem is arranged in the middle of the blade frame, and the size of the blade stem gradually decreases from the root of the wind turbine blade to the tip of the blade to form a cone. The blade stem is preferably a truss structure. The blade frame includes at least two grilles, each of which is provided with a leaf plate 101. The leaf plate 101 is opened and closed in two directions by the aforementioned spring group. Specifically, one leaf plate 101 can be arranged in the grille, or two leaf plates can be arranged relatively. The leaf plate is hinged with the window rod 102 of the grille. A window frame 103 can be arranged around the leaf plate 101. The leaf plate is embedded in the window frame. The window frame 103 is rotatably connected with the window rod 102 of the grille through three connecting rods 21 arranged at intervals through three groups of spring groups. A leaf seal 104 is arranged between adjacent spring groups. The leaf seal 104 is welded to the window frame 103 of the leaf plate. A leaf middle frame 105 can also be arranged in the middle of the window frame. In this embodiment, the leaf plate 101 can be arranged along the length or width direction of the grille. Preferably, the rotating end of the leaf plate 101 is arranged in the direction of the blade root, and the opening and closing free end is arranged toward the blade tip. The leaf plate 101 can be a flat plate or a corrugated plate, and the corrugated structure can increase the strength of the leaf plate.

[0043] The working principle of the wind turbine blade of this embodiment is as follows: when the wind pressure is less than the minimum elastic force of the spring, the leaf plate remains in a closed state; when the wind pressure is greater than the maximum elastic force of the spring, the leaf plate is fully opened; when the wind pressure is between the minimum elastic force and the maximum elastic force of the spring, the spring 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 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 spring, 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 grille, thereby greatly reducing the force on the leaf plate. When encountering whirlwind, different leaf plates of the same blade can be opened in different directions by the first spring and the second spring when they are affected by wind forces in different directions.

[0044] It can be said that the present invention uses a spring group for wind turbine blades. On the one hand, it is extremely easy to start the wind turbine when the wind speed is relatively low, thereby improving the efficiency of wind power generation and being suitable for installing wind power systems at any location in the world, including the seaside, on the mountain, on the roadside, etc. On the other hand, when the wind speed is very high, the leaf plate can be opened automatically without being subjected to a large impact force, thereby greatly improving the force strength of the leaf plate, thereby increasing its service life and reducing maintenance costs.

[0045] Example 2

[0046] The difference from Example 1 is that a bearing is arranged on the shaft seat, and the shaft body is connected to the bearing of the shaft seat through two partitions, and the shaft body can rotate along the bearing. The first spring is sleeved on the part of the shaft body in the first area, and the second spring is sleeved on the part of the shaft body in the second area. The leaf is fixedly connected to the part of the shaft body arranged between the two partitions through a connecting rod, and when an external force pushes the leaf, the shaft body is driven to rotate to realize the rotation of the leaf.

[0047] The other structures are the same as those in Example 1.

[0048] Example 3

[0049] On the basis of embodiment 1, the first spring and the second spring of this embodiment are further connected to an adjusting part for adjusting the spring torque. The adjusting part can be arranged on the shaft seat. Since the structure for adjusting the spring torque is already a prior art, it will not be described in detail here.

[0050] In summary, the present invention can achieve bidirectional adaptive rotation of the leaf plates on the basis of simplifying the structure and reducing the size of the elastic component; on the other hand, when used for wind turbine blades, it can greatly improve the force strength of the leaf plates and the wind power generation efficiency.

[0051] 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 wind turbine blade, comprising a blade frame, wherein the blade frame comprises at least one grid; characterized in that: A page plate is provided inside the grille, and a spring group is provided between the page plate and the grille, which can control the page plate to open and close in two directions along the grille; the spring group includes a first spring and a second spring provided between the page plate and the grille; the first spring and the second spring are exposed and provided on the same shaft body, and when the page plate drives the second spring to rotate forward, the front of the first spring is limited by the first limiter; when the page plate drives the first spring to rotate backward, the rear of the second spring is limited by the second limiter; One end of the first spring and the second spring is respectively provided with a spring triggering angle extending toward the page plate, and the page plate is arranged between the two spring triggering angles, and the corresponding spring is driven to rotate by triggering any spring triggering angle by the page plate; the first limiter is arranged above the spring triggering angle of the first spring; The second limiter is arranged below the spring triggering angle of the second spring; the spring triggering angle is a bent structure; The shaft body is connected to the shaft seat, and two areas are provided on the shaft seat. The first spring and the second spring are respectively provided in the two areas and sleeved on the shaft body, and a page plate is connected between the two areas; a first partition plate and a second partition plate are provided in the middle or near the middle of the shaft seat, and the shaft seat is divided into the two areas by the partition plate, the first limit member is provided on the first partition plate, and the second limit member is provided on the second partition plate, and the first limit member and the second limit member are both limit pins extending horizontally along the partition plate; the page plate is rotatably connected to the part of the shaft body between the two partition plates.

2. The wind turbine blade according to claim 1, characterized in that: When the front of the first spring is limited by the first limit piece, the second spring generates torque to control the page plate to open and close adaptively; when the rear of the second spring is limited by the second limit piece, the first spring generates torque to control the page plate to open and close adaptively in the opposite direction, so that the forces of the first spring and the second spring are not offset.

3. The wind turbine blade according to claim 1, characterized in that: The other ends of the first spring and the second spring are respectively provided with extended spring limit angles for limiting the rotation of the spring at the ends.

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