Adaptive lift-drag wind turbine blades and vertical axis wind turbines

Abstract

This invention discloses an adaptive lift-drag type wind turbine blade and a vertical axis split generator. The wind turbine blade includes a mounting frame, a drive blade, an elastic reset element, and an inertial element. The drive blade includes a fixed blade and a movable blade pivotally mounted on one side of the fixed blade. In the deployed state, a wind trap is formed between the other end of the movable blade and the fixed blade. In the folded state, the movable blade and the fixed blade form a lift-type blade with an airfoil-shaped cross-section. The elastic reset element gives the drive blade a tendency to switch from the folded state to the deployed state. The inertial element is movably mounted between a near-axis position and a far-axis position on the mounting frame. The inertial element is connected to the pivot shaft via a flexible cable, which, when tensioned, drives the drive blade to switch from the deployed state to the folded state. In this invention, the shape of the drive blade can be changed under different wind speed conditions, improving the problems of vertical axis wind turbines failing to start at low wind speeds and having low wind energy conversion efficiency at high wind speeds.

Description

Technical Field

[0001] This invention relates to the field of wind power generation, and more particularly to adaptive lift-drag wind turbine blades and vertical axis wind turbines. Background Technology

[0002] In related technologies, vertical axis wind turbines are typically equipped with lift-type blades or drag-type blades to capture wind energy.

[0003] Lift-type blades have a higher starting wind speed and often cannot start in low-wind environments. Drag-type blades have a lower starting wind speed, but their wind energy utilization rate is low in high-wind environments. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, one objective of the present invention is to propose an adaptive lift-drag type wind turbine blade, in which the drive blade can switch between an deployed state and a folded state under different wind speed environments, which is beneficial to improving the problems of vertical axis wind turbines failing to start at low wind speeds and having low wind energy conversion efficiency at high wind speeds.

[0005] The first aspect of the present invention provides an adaptive lift-drag type wind turbine blade, which includes a mounting frame, a drive blade, an elastic reset element, and an inertial element. The mounting frame has a main shaft mounting section for connecting the main shaft; a drive blade is disposed on the mounting frame, the drive blade including a fixed blade and a movable blade disposed on one side of the fixed blade, the fixed blade being fixed to the mounting frame, and one end of the movable blade being connected to the fixed blade via a pivot shaft; the drive blade has an deployed state and a folded state; in the deployed state, the other end of the movable blade is separated from the fixed blade so that a wind shield is formed between the other end of the movable blade and the fixed blade; in the folded state, the other end of the movable blade abuts against the fixed blade, and the movable blade and the fixed blade together form a lift blade with an airfoil-shaped cross-section; an elastic reset member acts on the movable blade to give the drive blade a tendency to switch from the folded state to the deployed state; an inertial member is movably disposed on the mounting frame between a near-main shaft position and a far-main shaft position, the inertial member being connected to the pivot shaft via a flexible cable, the flexible cable being configured to drive the drive blade to switch from the deployed state to the folded state when tensioned.

[0006] In some embodiments, the mounting bracket is provided with a locking component, and a locking position and an unlocking position for restricting the movement of the locking component; when the locking component moves to the locking position on the mounting bracket, the locking component is used to abut against the movable blade, thereby preventing the movable blade from moving toward the fixed blade; when the locking component moves to the unlocking position on the mounting bracket, the locking component disengages from the movable blade, so that the flexible cable, when tensioned, drives the drive blade to switch from the unfolded state to the folded state.

[0007] In some embodiments, the locking assembly includes a first cable, and the inertial member is connected to the locking assembly via the first cable so that the first cable, when tensioned, drives the locking assembly to an unlocked position; the mounting bracket also has an intermediate position located between the near-spindle position and the far-spindle position; when the inertial member is located between the near-spindle position and the intermediate position, the flexible cable is relaxed, and the first cable is tensioned to drive the locking assembly to the unlocked position; when the inertial member is located at the intermediate position and between the intermediate position and the far-spindle position, the flexible cable is tensioned to drive the drive blade to switch from the unfolded state to the folded state, and the first cable is tensioned to keep the locking assembly in the unlocked position; when the inertial member is located at the far-spindle position, the flexible cable is tensioned to keep the drive blade in the folded state.

[0008] In some embodiments, the mounting bracket has a latch groove; the locking assembly further includes a latch and a latch elastic member, the latch is telescopically mounted in the latch groove, the latch has a locking position extending out of the latch groove and an unlocking position retracted into the latch groove; the latch elastic member is disposed between the latch groove and the latch, and the latch elastic member is compressed to make the latch tend to return to the locking position.

[0009] In some embodiments, the inertial component includes an inertial slider that is slidably disposed on a first guide rail of the mounting frame along a first direction; the locking assembly further includes a drive shaft pivotally mounted on the mounting frame, the drive shaft being used to wind around the first cable, the drive shaft being disposed on one side of the first guide rail and correspondingly disposed at the middle position; the inertial slider is provided with a rack extending parallel to the first direction, and the outer peripheral surface of the drive shaft is also provided with drive teeth for meshing with and driving the rack; the rack has a first contact position and a second contact position at its two ends, and the rack also has a third contact position between the first contact position and the second contact position;

[0010] The transmission teeth and the rack satisfy one of the following four conditions:

[0011] (a) When the transmission teeth are engaged at the first contact position, the first cable is tensioned and the flexible cable is relaxed;

[0012] (b) When the transmission gear is engaged between the first contact position and the third contact position, the first cable is tensioned to drive the locking assembly to the unlock position.

[0013] (c) When the transmission gear is engaged at the third contact position, the inertial element is in the intermediate position;

[0014] (d) When the transmission gear engages the third contact position and between the third contact position and the second contact position, the first cable is tensioned to keep the locking assembly in the unlocked position, and the flexible cable is tensioned to drive the drive blade to switch from the unfolded state to the folded state.

[0015] In some embodiments, a second anti-rotation member is fixed on the mounting bracket, the second anti-rotation member being used to abut against the movable blade to limit the maximum interval between the movable blade and the fixed blade.

[0016] In some embodiments, the lifting blade adopts a symmetrical airfoil of the NACA type; one-third to one-half of the lifting blade is cut off from the tip to the blade tip on one side to form the fixed blade; the cut-off portion on the lifting blade forms a clearance groove for accommodating the movable blade, the movable blade being constructed as the cut-off portion of the lifting blade.

[0017] In some embodiments, the number of drive blades is at least two; the adaptive lift-drag type wind turbine blade further includes a synchronization component, which includes a linkage slider, a linkage cable and at least two synchronization wheels. The synchronization wheels and the pivot axis of the drive blade are coaxially arranged. The linkage slider is connected to the synchronization wheels through the linkage cable to drive multiple synchronization wheels to rotate simultaneously. One end of the flexible cable is connected to the inertial element, and the other end of the flexible cable is connected to the linkage slider.

[0018] In some embodiments, the mounting frame is provided with a second guide rail and a reversing roller; the second guide rail is arranged parallel to the first guide rail on the mounting frame, and the linkage sliding member is slidably engaged on the second guide rail; the reversing roller is disposed between the first guide rail and the second guide rail, and the flexible cable is tensioned on the reversing roller.

[0019] A second aspect of the present invention provides a vertical axis wind turbine, including a main shaft; a power generation device, wherein the main shaft is connected to the power generation device; and an adaptive lift-drag type wind turbine blade, wherein the adaptive lift-drag type wind turbine blade includes a plurality of blades arranged circumferentially spaced along the main shaft, and the mounting bracket of the adaptive lift-drag type wind turbine blade is fixedly connected to the main shaft through the main shaft mounting portion.

[0020] According to the adaptive lift-drag wind turbine blade provided in this embodiment, it has the following advantages compared with related technologies: (1) When the rotational speed of the adaptive lift-drag wind turbine blade is high, the inertial component can move to a position far from the main shaft. The inertial component tensions the flexible cable, and the flexible cable drives the drive blade to switch from the unfolded state to the folded state. In the folded state, the movable blade and the fixed blade surround the lift-type blade, which improves the wind energy conversion efficiency of the adaptive lift-drag wind turbine blade under high wind speed conditions. (2) When the rotational speed of the adaptive lift-drag wind turbine blade is low, although the inertial component tends to move away from the main shaft, the centrifugal force of the inertial component is less than the reset force. The reset force of the elastic reset component plays a major role and acts on the movable blade. The drive blade remains in the unfolded state, so that the adaptive lift-drag wind turbine blade can also rotate around the main shaft in a low wind speed environment, which is beneficial to improving the problem that the vertical axis wind turbine cannot start at low wind speed. The drive blade can capture wind energy more stably. (3) Through the cooperation between the inertial components, elastic reset components and drive blades, the adaptive lift-drag wind turbine blade can adapt to different wind speed conditions and optimize wind energy utilization efficiency. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the overall structure of a vertical axis wind turbine according to an embodiment of the present invention, in which the drive blade in the adaptive lift-drag type wind turbine blade is in a folded state.

[0023] Figure 2 This is a schematic diagram of the overall structure of a vertical axis wind turbine according to an embodiment of the present invention, in which the movable blades in the adaptive lift-drag type wind turbine blades are in the deployed state.

[0024] Figure 3 This is a schematic diagram of the structure of a vertical axis wind turbine according to an embodiment of the present invention;

[0025] Figure 4 and Figure 5This is an enlarged view of an adaptive lift-drag wind turbine blade according to an embodiment of the present invention, wherein the inertial slider is located near the main shaft.

[0026] Figure 6 and Figure 7 A schematic diagram of the cooperation between the drive blade and the locking assembly according to an embodiment of the present invention, wherein the movable blade in the drive blade is in the deployed state;

[0027] Figure 8 This is a partially enlarged view of a vertical axis wind turbine according to an embodiment of the present invention, in which the movable blades in the adaptive lift-drag type wind turbine blades are in a folded state;

[0028] Figure 9 This is a partial perspective view of an adaptive lift-drag wind turbine blade according to an embodiment of the present invention, used to show the connection relationship of various components in the locking assembly;

[0029] Figure 10 This is a schematic diagram of the cooperation between the inertial slider and the transmission shaft according to an embodiment of the present invention, in which the locking tongue retracts into the locking tongue groove;

[0030] Figure 11 This is a schematic diagram of the cooperation between the inertial slider and the drive shaft according to an embodiment of the present invention. At this time, the inertial slider approaches the drive shaft under the drive of centrifugal force.

[0031] Figure 12 This is a schematic diagram of the engagement between the locking tongue and the drive blade according to an embodiment of the present invention;

[0032] Figure 13 This is an assembly diagram of the synchronization component, inertial component, and lower beam plate according to an embodiment of the present invention, wherein the inertial component is located at the far spindle position;

[0033] Figure 14 This is an assembly diagram of the synchronization component, inertial component, damping spring and upper beam plate according to an embodiment of the present invention, in which the inertial component is located at the far spindle position;

[0034] Figure 15 This is an assembly diagram of the second anti-rotation member, the locking tongue, and the movable blade according to an embodiment of the present invention; it also shows an assembly diagram of the elastic reset member, the synchronous pulley, and the pivot shaft.

[0035] Figure 16 This is a partial perspective view of an adaptive lift-drag type wind turbine blade according to an embodiment of the present invention, used to show the structure of the oil storage tank;

[0036] Figure 17 This is a partial structural schematic diagram of an adaptive lift-drag wind turbine blade according to an embodiment of the present invention.

[0037] Figure label:

[0038] 1000 vertical axis wind turbine;

[0039] Adaptive lift-drag type wind turbine blade 100, main shaft 200, upper end cover 301, lower end cover 302;

[0040] Mounting bracket 1, first guide rail 11, first stop 111, second stop 112, locking tongue groove 12, spindle mounting part 13, second guide rail 14, reversing roller 15, upper beam plate 16, lower beam plate 17, protective cover 18;

[0041] Drive blade 2, fixed blade 21, clearance groove 211, movable blade 22, pivot shaft 23, oil filling hole 24, oil storage tank 25;

[0042] 3. Elastic reset component;

[0043] Locking assembly 4, locking tongue 41, locking tongue elastic element 42, first cable 43, drive shaft 44, drive gear 441, reversing bracket 45, locking reversing wheel 46, second anti-rotation element 47;

[0044] Inertial component 5, rack 51, first contact position 511, second contact position 512, third contact position 513, inertial slider 52, flexible cable 53;

[0045] Synchronization component 6, linkage sliding component 61, linkage cable 62, synchronization pulley 63, tension pulley 64;

[0046] 7. Vibration damping spring. Detailed Implementation

[0047] The embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0048] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0049] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0050] The following is for reference. Figures 1-17 An adaptive lift-drag type wind turbine blade 100 and a vertical axis wind turbine generator 1000 are described according to embodiments of the present invention.

[0051] Example 1

[0052] like Figure 1 , Figure 3 and Figure 17 As shown, this embodiment provides an adaptive lift-drag type wind turbine blade 100, which includes a mounting frame 1, a drive blade 2, an elastic reset component 3, and an inertial component 5.

[0053] Mounting bracket 1 has a spindle mounting section 13 for connecting spindle 200.

[0054] The drive blade 2 is mounted on the mounting frame 1. The drive blade 2 includes a fixed blade 21 and a movable blade 22 located on one side of the fixed blade 21. The fixed blade 21 is fixed to the mounting frame 1, and one end of the movable blade 22 is connected to the fixed blade 21 via a pivot shaft 23. The drive blade 2 has an deployed state and a folded state. In the deployed state, the other end of the movable blade 22 is separated from the fixed blade 21 so that a windshield is formed between the other end of the movable blade 22 and the fixed blade 21. In the folded state, the other end of the movable blade 22 abuts against the fixed blade 21, and the movable blade 22 and the fixed blade 21 together form a lifting blade with an airfoil-shaped cross-section.

[0055] It should be noted that the movable blade 22 and the fixed blade 21 together form a lifting blade, and the cross-sectional shape of the lifting blade is an airfoil. This model uses the symmetrical airfoil of the NACA model, where the curvature of both sides of the blade surface is the same. That is, the surface of the lifting blade near the main shaft 200 and the surface of the lifting blade away from the main shaft 200 have symmetrical curved profiles. Figure 6 As shown, the drive blade 2 includes two relatively movable parts: a fixed blade 21 and a movable blade 22. The fixed blade 21 can be configured as a lift-type blade with one-third to one-half of its remaining portion cut off from the blade tip to the blade tail on one side. The movable blade 22 is configured as the cut-off portion of the aforementioned lift-type blade, with one end of the cut-off portion connected to the remaining portion via a pivot shaft 23. Therefore, when the movable blade 22 is retracted, the fixed blade 21 and the movable blade 22 can form a lift-type blade.

[0056] The elastic reset member 3 acts on the movable blade 22, and the elastic reset member 3 can make the drive blade 2 have a tendency to switch from the folded state to the unfolded state.

[0057] The inertial component 5 is movably mounted on the mounting frame 1. The inertial component 5 can move between the near-main shaft position and the far-main shaft position on the mounting frame 1. The inertial component 5 is connected to the pivot shaft 23 via a flexible cable 53. The flexible cable 53 is configured to drive the drive blade 2 to switch from the unfolded state to the folded state when tensioned.

[0058] In a specific application scenario, the adaptive lift-drag type wind turbine blade 100 is fixedly connected to the main shaft 200 via the main shaft mounting part 13. The main shaft 200 is the pivot center of the vertical axis wind turbine generator 1000, and the adaptive lift-drag type wind turbine blade 100 rotates around the main shaft 200. When the mounting frame 1 rotates with the main shaft 200, the inertial element 5 tends to move from a position near the main shaft to a position far from the main shaft. The position near the main shaft is the end of the mounting frame 1 closest to the main shaft mounting part 13, and the position far from the main shaft is the end of the mounting frame 1 furthest from the main shaft mounting part 13. That is to say, when the adaptive lift-drag type wind turbine blade 100 rotates around the main shaft 200, the inertial block tends to move away from the rotation center, i.e., the inertial block tends to move away from the position near the main shaft and towards the position far from the main shaft.

[0059] The inertial component 5 is a rotating mass block. When the adaptive lift-drag type wind turbine blade 100 rotates around the main shaft 200, the inertial component 5 generates centrifugal force due to its own mass and rotation radius.

[0060] When the wind speed is high, the inertial component 5 gradually moves to the position far from the main axis, the flexible cable 53 gradually tightens and drives the pivot shaft 23 to rotate after tightening. The pivot shaft 23 drives the movable blade 22 to overcome the elastic restoring force. Therefore, the other end of the movable blade 22 gradually approaches the fixed blade 21 until it touches the fixed blade 21, and the driving blade 2 faces the wind in the folded state with the structure of a lifting blade.

[0061] When the wind speed is low, the other end of the movable blade 22 is separated from the fixed blade 21, and the wind force can act on the wind swivel formed between the other end of the movable blade 22 and the fixed blade 21. Although the inertial component 5 still tends to move to the position far from the main axis, due to the low wind speed and small centrifugal force, the pivot shaft 23 cannot drive the movable blade 22 to overcome the reset force. Therefore, under the dominant action of the elastic reset component 3, the drive blade 2 is still in the deployed state.

[0062] According to the adaptive lift-drag type wind turbine blade 100 provided in this embodiment, it has the following advantages compared with related technologies: (1) When the rotation speed of the adaptive lift-drag type wind turbine blade 100 is high, the inertial element 5 can move to a position close to the main shaft. The inertial element 5 tensions the flexible cable 53, and the flexible cable 53 drives the drive blade 2 to switch from the unfolded state to the folded state. In the folded state, the active blade 22 and the fixed blade 21 form a lift-type blade, which improves the wind energy conversion efficiency of the adaptive lift-drag type wind turbine blade 100 under high wind speed conditions. (2) When the rotational speed of the adaptive lift-drag wind turbine blade 100 is low, although the inertial element 5 tends to move away from the main shaft 200, the centrifugal force of the inertial element 5 is less than the reset force. The reset force of the elastic reset element 3 plays a major role and acts on the movable blade 22, and the drive blade 2 remains in the deployed state. Thus, the adaptive lift-drag wind turbine blade 100 can rotate around the main shaft 200 even in low wind speed environments, which helps to improve the problem that the vertical axis wind turbine 1000 cannot start at low wind speeds. The drive blade 2 can capture wind energy more stably. (3) Through the cooperation between the inertial element 5, the elastic reset element 3 and the drive blade 2, the adaptive lift-drag wind turbine blade 100 can adapt to different wind speed conditions and optimize wind energy utilization efficiency.

[0063] Furthermore, Figure 15 and Figure 17 A schematic diagram of the assembly between the elastic reset element 3 and the pivot shaft 23 is shown. The movable blade 22 is connected to the fixed blade 21 via the pivot shaft 23. The elastic reset element 3 is constructed as a planar spiral spring sleeved on the pivot shaft 23. One end of the planar spiral spring is fixed to the pivot shaft 23, and the other end is fixed to the fixed blade 21. The elastic force of the planar spiral spring can drive the pivot shaft 23 to rotate, thereby driving the movable blade 22 to move, allowing the drive blade 2 to rotate from the folded state to the unfolded state. By using the pivot shaft 23 and the planar spiral spring, the adaptive lift-drag type wind turbine blade 100 has a lower cost and a more stable structure.

[0064] like Figure 3 As shown, the mounting bracket 1 is further equipped with a protective cover 18, which forms a cavity between the protective cover 18 and the mounting bracket 1. The elastic reset member 3 and a portion of the pivot shaft 23 are located in the cavity. One end of the planar spiral spring is fixed to the pivot shaft 23, and the other end of the planar spiral spring can also be fixed to the protective cover 18. That is, one end of the planar spiral spring changes position as the pivot shaft 23 rotates, while the other end of the planar spiral spring is fixed relative to the pivot shaft 23. Thus, the planar spiral spring can store and release elastic potential energy.

[0065] like Figure 6 , Figure 7 and Figure 16As shown, in a specific embodiment, the fixed blade 21 has a clearance groove 211, which can be used to accommodate the movable blade 22. One-third to one-half of the lifting blade is cut off from the tip to the blade tip on one side to form the fixed blade 21. The cut-off portion on the lifting blade forms the clearance groove 211. The movable blade 22 is constructed as the cut-off portion of the lifting blade described above.

[0066] Example 2

[0067] Furthermore, the mounting frame 1 is also equipped with a locking component 4, which is movably mounted on the mounting frame 1 and can move between a locked position and an unlocked position. When the locking component 4 moves to the locked position, it abuts against the movable blade 22, thereby preventing the movable blade 22 from moving towards the fixed blade 21. When the locking component 4 moves to the unlocked position, it disengages from the movable blade 22, allowing the flexible cable 53 to drive the drive blade 2 from the unfolded state to the folded state when tensioned. By setting the locking component 4, the other end of the movable blade 22 can be prevented from approaching the fixed blade 21 under the drive of the wind, thus allowing the drive blade 2 to remain in the unfolded state and enabling the drive blade 2 to continuously and stably capture wind energy.

[0068] According to the adaptive lift-drag type wind turbine blade 100 provided in this embodiment, by setting the locking component 4, the movable blade 22 can be kept more stably in the deployed state, which can avoid the accidental movement of the movable blade 22 caused by external unstable airflow or other minor disturbance factors to a certain extent, and reduce the impact of unstable airflow on the energy capture of the drive blade 2.

[0069] Example 3

[0070] like Figure 3 , Figure 10 and Figure 17 As shown, the locking assembly 4 further includes a first cable 43, and the inertial member 5 is connected to the locking assembly 4 via the first cable 43 so that the first cable 43 drives the locking assembly 4 to move to the unlocked position when tensioned. The mounting bracket 1 also has an intermediate position located between the near-spindle position and the far-spindle position. When the inertial member 5 is between the near-spindle position and the intermediate position, the flexible cable 53 is relaxed, and the first cable 43 is tensioned to drive the locking assembly 4 to move to the unlocked position; when the inertial member 5 is in the intermediate position and between the intermediate position and the far-spindle position, the first cable 43 is tensioned to keep the locking assembly 4 in the locked position, and the flexible cable 53 is tensioned to drive the leaf from the unfolded state to the folded state. That is to say, the inertial member 5 is also linked with the locking assembly 4, and the inertial member 5 can drive the locking assembly 4 from the locked position to the unlocked position.

[0071] Specifically, firstly, when the inertial component 5 is between the near-main axis position and the intermediate position, the locking assembly 4 is in the locked position, and the drive blade 2 is in the deployed state. The flexible cable 53 is relaxed, the inertial component 5 is subjected to centrifugal force and moves towards the far-main axis position, and the first cable 43 is always in a taut state. Driven by the inertial component 5, the first cable 43 drives the locking assembly 4 from the locked position to the unlocked position.

[0072] The inertial component 5 continues to move. When the inertial component 5 is between the middle position and the far main axis position, the locking component 4 is in the unlocked position. At this time, the first cable 43 is still in a tensioned state so that the locking component 4 is kept in the unlocked position. The inertial component 5 drives the flexible cable 53 to be tensioned. The flexible cable 53 drives the pivot shaft 23 to rotate, which in turn drives the movable blade 22 to overcome the reset force and gradually approach the fixed blade 21.

[0073] When the inertial component 5 is located at the far main axis position, the drive blade 2 is in a folded state, and the movable blade 22 and the fixed blade 21 form a lifting blade with an airfoil-shaped cross-section.

[0074] Example 4

[0075] like Figure 9 As shown, the mounting bracket 1 further includes a latch groove 12; the locking assembly 4 also includes a latch 41 and a latch elastic member 42. The latch 41 is telescopically mounted in the latch groove 12. The latch 41 has a locking position extending out of the latch groove 12 and an unlocking position retracted into the latch groove 12. The latch elastic member 42 is located between the latch groove 12 and the latch 41. The latch elastic member 42 is compressed so that the latch 41 tends to return to the locking position.

[0076] As can be seen from the above embodiments, such as Figure 17 As shown, firstly, when the inertial component 5 is located between the near-main shaft position and the middle position, the locking component 4 is in the locked position, the flexible cable 53 is relaxed, the inertial component 5 is subjected to centrifugal force and moves towards the far-main shaft position, the first cable 43 is always in a tensioned state, and the first cable 43 drives the locking tongue 41 from the locked position to the unlocked position under the drive of the inertial component 5, that is, the first cable 43 drives the locking tongue 41 to gradually retract into the locking tongue groove 12.

[0077] The inertial component 5 continues to move. When the inertial component 5 is between the middle position and the far main axis position, the locking component 4 is in the unlocked position, that is, the first cable 43 drives the locking tongue 41 to fully retract into the locking tongue groove 12. At this time, the first cable 43 is still in a tensioned state to counteract the elastic force of the locking tongue elastic component 42. The inertial component 5 drives the flexible cable 53 to be tensioned. The flexible cable 53 drives the pivot shaft 23 to rotate, which in turn drives the movable blade 22 to overcome the reset force and gradually approach the fixed blade 21.

[0078] When the inertial component 5 is located at the far main axis position, the drive blade 2 is in a folded state, and the movable blade 22 and the fixed blade 21 form a lifting blade with an airfoil-shaped cross-section.

[0079] Example 5

[0080] like Figure 3 and Figure 17 As shown, the inertial component 5 further includes an inertial slider 52, which is slidably disposed on the first guide rail 11 of the mounting frame 1 along a first direction; the locking assembly 4 also includes a drive shaft 44, which is pivotally mounted on the mounting frame 1. The drive shaft 44 is used to wind around the first cable 43 and is disposed on one side of the first guide rail and correspondingly positioned in the middle. The inertial slider 52 is provided with a rack 51 extending parallel to the first direction, and the outer circumferential surface of the drive shaft 44 is also provided with drive teeth 441 for meshing with the drive rack 51. The rack 51 has a first contact position 511 and a second contact position 512 at its two ends, and a third contact position 513 between the first contact position 511 and the second contact position 512. The drive shaft 44 and the inertial slider 52 are driven by meshing of the rack 51 and the drive teeth 441. The rack 51 has a certain length in the first direction, and along the first direction are a first contact position 511 located at one end of the rack 51, a second contact position 512 located at the other end of the rack 51, and a third contact position 513 between the two ends of the rack 51.

[0081] The transmission gear 441 and the rack 51 satisfy one of the following four conditions:

[0082] (a) When the transmission gear 441 is engaged at the first contact position 511, the first cable 43 is tensioned and the flexible cable 53 is relaxed;

[0083] (b) When the transmission gear 441 is engaged between the first contact position 511 and the third contact position 513, the first cable 43 is tensioned to drive the locking assembly 4 to move to the unlocked position;

[0084] (c) When the transmission gear 441 is engaged in the third contact position 513, the inertial element 5 is in the middle position. That is to say, when the transmission gear 441 is engaged in the third contact position 513 of the rack 52, the inertial slider 51 and the transmission shaft 44 have a specific relative position, and the inertial element 5 is exactly in the middle position of the mounting bracket 1. At this time, the locking assembly 4 is fully moved to the unlocked position, the locking tongue 41 retracts into the locking tongue groove 12, and does not obstruct the movement of the moving leaf 22. (d) When the transmission gear 441 is engaged between the third contact position and the second contact position and in the third contact position, the first cable 43 is tensioned to keep the locking assembly 4 in the unlocked position, and the flexible cable 53 is tensioned to drive the drive leaf 2 to switch from the unfolded state to the folded state.

[0085] Specifically:

[0086] (1) Driven by centrifugal force, the inertial slider 52 gradually moves from the position near the main shaft to the middle position, so that the first contact position 511 of the rack 51 starts to mesh with the transmission teeth 441 on the transmission shaft 44.

[0087] (2) The rack 51 continues to slide along the first direction, and the transmission teeth 441 of the transmission shaft 44 continue to mesh between the first contact position 511 and the third contact position 513 of the rack 51; the transmission shaft 44 winds the first cable 43 to drive the locking tongue 41 to gradually retract into the locking tongue groove 12.

[0088] (3) The rack 51 continues to slide along the first direction, and the third contact position 513 of the rack 51 meshes with the transmission tooth 441, and the locking tongue 41 is fully retracted into the locking tongue groove 12. At the same time, the inertial slider 52 tightens the flexible cable 53, and the flexible cable 53 drives the pivot shaft 23 to rotate and drives the drive blade 2 to gradually switch from the unfolded state to the folded state;

[0089] (4) When the inertial slider 52 moves to the far main shaft position, the drive blade 2 is in a folded state.

[0090] like Figure 3 and Figure 17 As shown, further, a first guide rail 11 extending along a first direction is fixed on the mounting bracket 1, and the inertial component 5 includes an inertial slider 52 that slides with the first guide rail 11; the first guide rail 11 is provided with a first stop 111 and a second stop 112 at intervals in the first direction for limiting the sliding stroke of the inertial slider 52, and the inertial slider 52 slides along the first guide rail 11 between the first stop 111 and the second stop 112, which helps to prevent the inertial slider 52 from deviating from the preset trajectory and improves the stability of the inertial component 5 drive.

[0091] like Figure 3 and Figure 17 As shown, in a specific example, the first stop 111 is located on the first guide rail 11 near the spindle mounting portion 13, and the second stop 112 is located on the first guide rail 11 away from the spindle mounting portion 13. When the inertial slider 52 slides from the far spindle position to the near spindle position, the inertial slider 52 moves closer to the first stop 111 and away from the second stop 112.

[0092] like Figure 3 and Figure 17 As shown, further, one of the inertial slider 52 or the second stop 112 is provided with a damping spring 7, which can absorb the collision energy between the inertial slider 52 and the second stop 112, which helps to reduce the possibility of damage caused by collision and improve the stability and reliability of the structure.

[0093] like Figure 9 As shown, the latch 41 assembly further includes a reversing bracket 45 and a locking reversing wheel 46. The locking reversing wheel 46 is rotatably mounted on the reversing bracket 45, and the first cable 43 changes the direction of tension through the locking reversing wheel 46, so that the direction of tension of the first cable 43 is consistent with the direction of movement of the latch 41.

[0094] Example 6

[0095] Combination Figure 12 and Figure 13 As shown, a second anti-rotation member 47 is further fixed on the mounting bracket 1. The second anti-rotation member 47 is used to abut against the movable blade 22 to limit the maximum gap between the movable blade 22 and the fixed blade 21. The other end of the movable blade 22 moves along the rotation path, and the two ends of the rotation path are stopped by the fixed blade 21 and the second anti-rotation member 47, respectively. Thus, the movable blade 22 can be controllably positioned within the rotation path.

[0096] As can be seen from the above embodiment three, if Figure 6 , Figure 7 and Figure 15 As shown, the adaptive lift-drag type wind turbine blade also includes a second anti-rotation member 47, which is fixed on the mounting frame 1. When the locking assembly 4 is in the locked position, the drive blade 2 is in the unfolded state, and the second anti-rotation member 47 abuts against the locking tongue 41 on different sides of the movable blade 22. Along the movement path of the movable blade 22, the mounting frame 1 is sequentially provided with the locking tongue 41 and the second anti-rotation member 47. The locking tongue 41 has a guide slope on the side facing away from the second anti-rotation member 47. The guide slope gradually inclines towards the side away from the locking tongue groove 12 and towards the side of the second anti-rotation member 47. Thus, during the movement of the drive blade 2 from the folded state to the unfolded state, the movable blade 22 moves towards the side of the second anti-rotation member 47, and the movable blade 22 pushes the locking tongue 41 back into the locking tongue groove 12 through the guide slope. The second anti-rotation member 47 is also provided with an anti-collision rubber ring, which helps absorb the collision energy between the movable blade 22 and the second anti-rotation member 47.

[0097] Example 7

[0098] like Figure 7 As shown, further, one-third to one-half of the lift blade from the tip to the blade tip on one side is removed to form a fixed blade 21; the removed portion on the lift blade forms a clearance groove 211 for accommodating the movable blade 22, the movable blade 22 is constructed as the removed portion of the lift blade, and one end of the removed portion (i.e. the movable blade 22) is connected to the fixed blade 21 via a pivot shaft 23.

[0099] Example 8

[0100] Combination Figure 1 , Figure 3 , Figure 5 and Figure 17 As shown, further, there are at least two drive blades 2; the adaptive lift-drag type wind turbine blade 100 also includes a synchronization component 6, which includes a linkage sliding member 61, a linkage cable 62, and at least two synchronization pulleys 63. The synchronization pulleys 63 and the pivot shaft 23 are coaxially arranged. The linkage sliding member 61 is connected to the synchronization pulleys 63 through the linkage cable 62 to drive multiple synchronization pulleys 63 to rotate simultaneously; the inertial member 5 is connected to the linkage sliding member 61 through a flexible cable 53. The synchronization component 6 is used to drive multiple drive blades 2 to move synchronously, which can improve energy capture efficiency. At the same time, the synchronization component 6 drives two movable blades 22 to unfold and close simultaneously. The mechanical structure is used for transmission, which makes the structure simpler and more reliable.

[0101] like Figure 2 and Figure 6 As shown, the locking assembly 4 is further disposed between two adjacent sets of drive blades 2. The two movable blades 22 are arranged facing each other, with one drive blade 2's movable blade 22 rotating and unfolding clockwise, and the other drive blade 2's movable blade 22 rotating and unfolding counterclockwise. Therefore, a locking assembly 4 includes a locking tongue 41 and a second anti-rotation member 47. The locking tongue 41 can simultaneously abut against both movable blades 22, and the second anti-rotation member 47 can simultaneously abut against both movable blades 22, thereby reducing the arrangement cost.

[0102] like Figure 3 and Figure 17 As shown, the mounting frame 1 further includes a second guide rail 14 and a reversing roller 15. The second guide rail 14 is arranged parallel to the first guide rail 11 on the mounting frame 1, and the linkage slider 61 is slidably engaged on the second guide rail 14. The reversing roller 15 is positioned between the first guide rail 11 and the second guide rail 14, and the flexible cable 53 is tensioned on the reversing roller 15. By setting the reversing roller 15, the movement directions of the inertial slider 52 and the linkage slider 61 are changed from the same to opposite, thus reducing the size of the mounting frame 1 in the first direction. This allows the first guide rail 11 and the second guide rail 14 to be arranged parallel in the first direction, making the structure of the adaptive lift-drag type wind turbine blade 100 more compact.

[0103] Example 9

[0104] like Figure 1 and Figure 2As shown, a second aspect embodiment of the present invention provides a vertical axis wind turbine 1000, which includes a main shaft 200, a power generation device, and an adaptive lift-drag type wind turbine blade 100 according to a first aspect embodiment of the present invention. The main shaft 200 is connected to the power generation device, and the adaptive lift-drag type wind turbine blade 100 includes a plurality of blades spaced circumferentially along the main shaft 200. The mounting bracket 1 in the adaptive lift-drag type wind turbine blade 100 is fixedly connected to the main shaft 200 through a main shaft mounting part 13.

[0105] The vertical axis wind turbine 1000 in this embodiment has the following advantages by adopting the adaptive lift-drag type wind turbine blade 100 described above: (1) When the rotational speed of the adaptive lift-drag type wind turbine blade 100 is high, the inertial element 5 can move to the position far from the main shaft. The inertial element 5 tensions the flexible cable 53, and the flexible cable 53 drives the drive blade 2 to switch from the unfolded state to the folded state. In the folded state, the movable blade 22 and the fixed blade 21 form a lift-type blade, which improves the wind energy conversion efficiency of the adaptive lift-drag type wind turbine blade 100 under high wind speed conditions. (2) When the rotational speed of the adaptive lift-drag wind turbine blade 100 is low, although the inertial element 5 tends to move away from the main shaft 200, the centrifugal force of the inertial element 5 is less than the reset force. The reset force of the elastic reset element 3 plays a major role and acts on the movable blade 22, and the drive blade 2 remains in the deployed state. Thus, the adaptive lift-drag wind turbine blade 100 can rotate around the main shaft 200 even in low wind speed environments, which helps to improve the problem that the vertical axis wind turbine 1000 cannot start at low wind speeds. The drive blade 2 can capture wind energy more stably. (3) Through the cooperation between the inertial element 5, the elastic reset element 3 and the drive blade 2, the adaptive lift-drag wind turbine blade 100 can adapt to different wind speed conditions and optimize wind energy utilization efficiency.

[0106] The following is based on Figures 1-17 Let me describe a specific implementation.

[0107] like Figures 1-3 , Figure 17 As shown, the vertical axis wind turbine 1000 includes a main shaft 200, a power generation device, and adaptive lift-drag type wind turbine blades 100. The main shaft 200 extends vertically and is connected to the power generation device. Three adaptive lift-drag type wind turbine blades 100 are spaced circumferentially along the main shaft 200, with adjacent blades spaced 120° apart. The mounting bracket 1 in each blade is fixedly connected to the main shaft 200 via a main shaft mounting portion 13. The adaptive lift-drag type wind turbine blades 100 capture wind energy and drive the main shaft 200 to rotate. The power generation device converts the wind energy into electrical energy.

[0108] like Figure 1 and Figure 2As shown, specifically, the vertical axis wind turbine 1000 also includes an upper end cover 301 and a lower end cover 302 fixed at both ends of the main shaft 200. The adaptive lift-drag type wind turbine blade 100 includes a mounting frame 1, which is constructed as an upper beam plate 16 and a lower beam plate 17. Both the upper beam plate 16 and the lower beam plate 17 are arranged along the radial direction of the main shaft 200. One end of the upper beam plate 16 has a main shaft mounting part 13 for connecting the upper end cover 301, and one end of the lower beam plate 17 has a main shaft mounting part 13 for connecting the lower end cover 302.

[0109] The drive blade 2 is located on the other end of the upper cover 301 and the other end of the lower cover 302.

[0110] Combination Figure 1 and Figure 3 As shown, each adaptive lift-drag type wind turbine blade 100 also includes two drive blades 2, an elastic reset component 3, an inertial component 5, a locking component 4, and a synchronization component 6.

[0111] like Figure 2 , Figures 5-7 As shown, the drive blade 2 includes a fixed blade 21 and a movable blade 22. The upper end of the fixed blade 21 is fixed to the upper beam plate 16, and the lower end of the fixed blade 21 is fixed to the lower beam plate 17. A clearance groove 211 is provided on the fixed blade 21, which can accommodate the movable blade 22. The drive blade 2 has an deployed state and a folded state. In the deployed state, the other end of the movable blade 22 is separated from the fixed blade 21, forming a windshield between the other end of the movable blade 22 and the fixed blade 21. In the folded state, the other end of the movable blade 22 abuts against the fixed blade 21, and the movable blade 22 and the fixed blade 21 together form a lift-type blade with an airfoil-shaped cross-section. The lift-type blade has an airfoil-shaped cross-section. Half of the lift-type blade is cut off from its tail to its tip on one side to form the fixed blade 21. The cut-off portion on the lift-type blade forms the clearance groove 211, and the movable blade 22 is constructed as the cut-off portion of the lift-type blade described above. The movable blade 22 is mounted in the clearance groove 211 via a pivot shaft 23, and the movable blade 22 can rotate relative to the fixed blade 21. When the drive blade 2 is in the deployed state, the other end of the movable blade 22 is separated from the fixed blade 21 so that a wind shield is formed between the other end of the movable blade 22 and the fixed blade 21; when the drive blade 2 is in the folded state, the movable blade 22 is stored in the clearance groove 211, and the movable blade 22 and the fixed blade 21 form a lifting blade.

[0112] like Figure 3 and Figure 16 As shown, the fixed blade 21 is also provided with an oil reservoir 25. The oil outlet of the oil reservoir 25 is connected to the pivot shaft 23 to add lubricating oil to the pivot shaft 23. The oil reservoir 25 is set in the protective cover 18, and the protective cover 18 has an oil filling hole 24 that is connected to the oil reservoir 25.

[0113] like Figure 6 and Figure 7 As shown, there are two drive blades 2, and the two movable blades 22 are arranged facing each other. The movable blade 22 of one drive blade 2 rotates and unfolds clockwise, while the movable blade 22 of the other drive blade 2 rotates and unfolds counterclockwise.

[0114] Combination Figure 3 , Figure 4 , Figure 5 and Figure 15 As shown, the synchronization component 6 includes a linkage slider 61, a linkage cable 62, and two synchronization wheels 63. The synchronization wheels 63 and the pivot shaft 23 are coaxially arranged. The linkage slider 61 is connected to the synchronization wheels 63 through the linkage cable 62 to drive multiple synchronization wheels 63 to rotate simultaneously. The inertial component 5 is connected to the linkage slider 61 through a flexible cable 53. The synchronization component 6 is used to drive multiple drive blades 2 to move synchronously.

[0115] like Figure 5 As shown, the linkage sliding member 61 is also equipped with a linkage reversing wheel. The linkage cable 62 is wound around the linkage reversing wheel and one end is connected to a synchronous pulley 63, and the other end is connected to another synchronous pulley 63. The axis connecting the two synchronous pulleys 63 is parallel to the first direction. A tensioning wheel 64 is also provided between the linkage reversing wheel and one of the synchronous pulleys 63 so that the linkage cables 62 on both sides of the linkage reversing wheel are staggered.

[0116] Combination Figure 5 , Figure 6 , Figure 7 , Figure 9 , Figure 10 , Figure 11 and Figure 13 As shown, the locking assembly 4 includes a locking tongue 41, a locking tongue elastic element 42, a first pull cable 43, and two second anti-rotation elements 47. Please refer to [link / reference]. Figure 9 A locking tongue groove 12 is provided on the upper beam plate 16. The locking tongue 41 is retractably disposed in the locking tongue groove 12. The inertial member 5 is connected to the locking tongue 41 through the first pull cable 43 to drive the locking tongue 41 to retract into the locking tongue groove 12. The elastic force of the locking tongue elastic member 42 is applied to the locking tongue 41 so that the locking tongue 41 tends to extend out of the locking tongue groove 12. Figure 2 and Figure 13 As shown, the two second anti-rotation members 47 are respectively fixed on the upper beam plate 16 and the lower beam plate 17. When the drive blade 2 is in the deployed state, the second anti-rotation members 47 abut against and cooperate with the locking assembly 4 on different sides of the movable blade 22. Figure 7As shown, along the movement path of the movable blade 22 from the folded state to the unfolded state, the mounting bracket 1 is sequentially equipped with a locking tongue 41 and a second anti-rotation member 47. The locking tongue 41 has a guide slope on the side away from the second anti-rotation member 47. The guide slope gradually slopes away from the locking tongue groove 12 and towards the second anti-rotation member 47. Thus, during the movement of the drive blade 2 from the folded state to the unfolded state, the movable blade 22 moves towards the second anti-rotation member 47, and the movable blade 22 pushes the locking tongue 41 back into the locking tongue groove 12 through the guide slope. The second anti-rotation member 47 is also equipped with an anti-collision rubber ring, which helps to absorb the collision energy between the movable blade 22 and the second anti-rotation member 47. The second anti-rotation member 47 is used to limit the maximum rotation position of the movable blade 22, and the fixed blade 21 is used to limit the minimum rotation position of the movable blade 22. The locking tongue 41 extends out of the locking tongue groove 12 to prevent the drive blade from moving from the unfolded state to the folded state. Both the locking tongue 41 and the second anti-rotation member 47 are located between the two drive blades 2.

[0117] Combination Figure 3 , Figure 9 and Figure 10 As shown, the locking assembly 4 also includes a drive shaft 44, which is mounted on the mounting bracket 1 and can pivot relative to the mounting bracket 1. A first cable 43 is wound around the drive shaft 44. A first guide rail 11 is laid on the upper beam plate 16 and the lower beam plate 17. The first guide rail 11 extends along a first direction, which is parallel to the radial direction of the main shaft 200. The drive shaft 44 is located on one side of the first guide rail 11. The inertial component 5 includes an inertial slider 52 that slides with the first guide rail 11. A rack 51 is provided on the inertial slider 52. A transmission tooth 441 is provided on the outer circumferential surface of the drive shaft 44. The transmission tooth 441 and the rack 51 engage in transmission to rotate the drive shaft 44. This means that the inertial slider 52 passes through the drive shaft 44, and the rack 51 on the inertial slider 52 meshes with the transmission teeth 441 on the drive shaft 44. Thus, the inertial slider 52 can drive the drive shaft 44 to rotate, thereby causing the first cable 43 wound around the drive shaft 44 to tighten. The first cable 43 then causes the locking tongue 41 to retract into the locking tongue groove 12. The inertial slider 52 slides along the first guide rail 11 between the first stop 111 and the second stop 112. The drive shaft 44 is located on one side of the first guide rail 11 and correspondingly in the middle position, which is beneficial to the stability and reliability of the meshing transmission between the transmission teeth 441 and the rack 51. The installation position of the drive shaft 44 can be adjusted according to actual conditions. The locking tongue 41 assembly also includes a reversing bracket 45 and a locking reversing wheel 46. The locking reversing wheel 46 is rotatably mounted on the reversing bracket 45. The first cable 43 changes its tension direction through the locking reversing wheel 46, so that the tension direction of the first cable 43 is consistent with the movement direction of the locking tongue 41.

[0118] like Figure 3As shown, the inertial slider 52 and the linkage slider 61 are connected by a flexible cable 53. The upper beam plate 16 and the lower beam plate 17 are provided with a second guide rail 14 and a reversing roller 15. The second guide rail 14 is arranged parallel to the first guide rail 11 on the mounting frame 1, and the linkage slider 61 is slidably engaged on the second guide rail 14. The reversing roller 15 is located between the first guide rail 11 and the second guide rail 14, and the flexible cable 53 is tensioned on the reversing roller 15. The reversing roller 15 is located on the upper beam plate 16 near the main shaft 200.

[0119] like Figure 10 As shown, the elastic reset element 3 is constructed as a planar spiral spring sleeved on the pivot shaft 23. One end of the planar spiral spring is fixed to the pivot shaft 23, and the other end is fixed to the fixed blade 21. The elastic force of the planar spiral spring can drive the pivot shaft 23 to rotate, thereby driving the movable blade 22 to move, so that the movable blade 22 can rotate from the folded state to the unfolded state.

[0120] like Figures 4-7 , Figure 8 , Figure 10 , Figures 13-14 As shown, firstly, when the inertial component 5 is between the near-main shaft position and the intermediate position, the locking assembly 4 is in the locked position, the flexible cable 53 is relaxed, and the inertial component 5 is subjected to centrifugal force and moves towards the far-main shaft position. Then, the first contact position 511 of the rack 51 begins to mesh with the drive shaft 44. As the inertial slider 52 continues to slide towards the far-main shaft position, the drive shaft 44 meshes between the first contact position 511 and the third contact position 513 of the rack 51. The drive shaft 44 winds the first cable 43, which drives the locking tongue 41 from the locked position to the unlocked position, that is, the first cable 43 drives the locking tongue 41 to gradually retract into the locking tongue groove 12.

[0121] The inertial slider 52 continues to move toward the far main shaft position, the rack 51 continues to slide along the far main shaft position, and the transmission teeth of the transmission shaft 44 continue to mesh between the first contact position 511 and the third contact position 513 of the rack 51; the transmission shaft 44 is wound, and after the first cable 43 is tensioned, it drives the locking tongue 41 to gradually retract into the locking tongue groove 12.

[0122] The rack 51 continues to slide along the far main shaft position. When the inertial slider 52 is in the middle position, the third contact position 513 of the rack 51 engages with the transmission teeth, and the locking tongue 41 retracts completely into the locking tongue groove 12. At the same time, the inertial slider 52 tightens the flexible cable 53, which drives the pivot shaft 23 to rotate and causes the drive blade 2 to gradually switch from the unfolded state to the folded state.

[0123] The inertial component 5 continues to move. When the inertial component 5 is between the middle position and the far main axis position, the locking component 4 is in the unlocked position, that is, the first cable 43 drives the locking tongue 41 to fully retract into the locking tongue groove 12. At this time, the first cable 43 is still in a tensioned state to counteract the elastic force of the locking tongue elastic component 42. The inertial component 5 drives the flexible cable 53 to be tensioned. The flexible cable 53 drives the pivot shaft 23 to rotate, which in turn drives the movable blade 22 to overcome the reset force and gradually approach the fixed blade 21.

[0124] Therefore, the minimum length of rack 51 in the first direction should be greater than the interval between the intermediate position and the far spindle position.

[0125] When the inertial component 5 is located at the far main axis position, the drive blade 2 is in a folded state, and the movable blade 22 and the fixed blade 21 form a lifting blade with an airfoil-shaped cross-section.

[0126] Other configurations and operations of the vertical axis wind turbine 1000 according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here. In the description of the present invention, "first feature" and "second feature" may include one or more of the features. The vertical, horizontal, and front-back directions are defined as shown in the figures.

[0127] In the description of this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features not in direct contact but through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature.

[0128] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0129] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An adaptive lift-drag type wind turbine blade, characterized in that, include: Mounting bracket (1) has a spindle mounting part (13) for connecting spindle (200); A drive blade (2) is provided on the mounting frame (1). The drive blade (2) includes a fixed blade (21) and a movable blade (22) provided on one side of the fixed blade (21). The fixed blade (21) is fixed on the mounting frame (1), and one end of the movable blade (22) is connected to the fixed blade (21) through a pivot shaft (23). The drive blade (2) has an unfolded state and a folded state; In the deployed state, the other end of the movable blade (22) is separated from the fixed blade (21) so that a wind shield is formed between the other end of the movable blade (22) and the fixed blade (21); In the folded state, the other end of the movable blade (22) abuts against the fixed blade (21), and the movable blade (22) and the fixed blade (21) together form a lifting blade with an airfoil-shaped cross-section; An elastic reset member (3) acts on the movable blade (22) to make the drive blade (2) have a tendency to switch from the folded state to the unfolded state; An inertial element (5) is movably disposed between a near-spindle position and a far-spindle position on the mounting frame (1). The inertial element (5) is connected to the pivot shaft (23) via a flexible cable (53), which is configured to drive the drive blade (2) to switch from the unfolded state to the folded state when tensioned.

2. The adaptive lift-drag type wind turbine blade according to claim 1, characterized in that, The mounting bracket (1) is provided with a locking assembly (4), and a locking position and an unlocking position for limiting the movement of the locking assembly (4); When the locking assembly (4) moves to the locking position on the mounting bracket (1), the locking assembly (4) is used to abut against the movable blade (22) to prevent the movable blade (22) from moving toward the fixed blade (21); When the locking assembly (4) moves to the unlocked position on the mounting bracket (1), the locking assembly (4) disengages from the movable blade (22) so that the flexible cable (53) drives the drive blade (2) to switch from the unfolded state to the folded state when it is tensioned.

3. The adaptive lift-drag type wind turbine blade according to claim 2, characterized in that, The locking assembly (4) includes a first cable (43), and the inertial member (5) is connected to the locking assembly (4) via the first cable (43) so that the first cable (43) drives the locking assembly (4) to move to the unlocked position when it is tensioned; The mounting bracket (1) also has an intermediate position located between the near spindle position and the far spindle position; When the inertial component (5) is located between the near-main axis position and the intermediate position, the flexible cable (53) is relaxed, and the first cable (43) is tensioned to drive the locking assembly (4) to move to the unlocked position; When the inertial element (5) is in the intermediate position and between the intermediate position and the far main axis position, the flexible cable (53) is tensioned to drive the drive blade (2) to switch from the unfolded state to the folded state, and the first cable (43) is tensioned to keep the locking assembly (4) in the unlocked position; When the inertial element (5) is in the far spindle position, the flexible cable (53) is tensioned to keep the drive blade (2) in the folded state.

4. The adaptive lift-drag type wind turbine blade according to claim 3, characterized in that, The mounting bracket (1) is provided with a locking tongue groove (12); The locking assembly (4) further includes a latch (41) and a latch elastic element (42). The latch (41) is telescopically mounted in the latch groove (12). The latch (41) has a locking position extending out of the latch groove (12) and an unlocking position retracted into the latch groove (12). The latch elastic member (42) is disposed between the latch groove (12) and the latch (41). The latch elastic member (42) is compressed so that the latch (41) tends to return to the locked position.

5. The adaptive lift-drag type wind turbine blade according to claim 3 or 4, characterized in that, The inertial component (5) includes an inertial slider (52), which is slidably disposed on the first guide rail (11) of the mounting frame (1) along a first direction; The locking assembly (4) further includes a drive shaft (44) pivotally mounted on the mounting bracket (1), the drive shaft (44) being used to wind around the first cable (43), the drive shaft (44) being located on one side of the first guide rail (11) and correspondingly positioned in the middle position; The inertial slider (52) is provided with a rack (51) extending parallel to the first direction, and the outer peripheral surface of the transmission shaft (44) is also provided with transmission teeth (441) for meshing and driving the rack (51). The rack (51) has a first contact position (511) and a second contact position (512) at both ends, and the rack (51) also has a third contact position (513) between the first contact position (511) and the second contact position (512). The transmission gear (441) and the rack (51) satisfy one of the following four conditions: (a) When the transmission gear (441) is engaged at the first contact position (511), the first cable (43) is tensioned and the flexible cable (53) is relaxed; (b) When the transmission gear (441) is engaged between the first contact position (511) and the third contact position (513), the first cable (43) is tensioned to drive the locking assembly (4) to the unlock position. (c) When the transmission gear (441) is engaged at the third contact position (513), the inertial member (5) is in the middle position; (d) When the transmission tooth (441) is engaged between the third contact position (513) and the second contact position (512), the first cable (43) is tensioned to keep the locking assembly (4) in the unlocked position, and the flexible cable (53) is tensioned to drive the drive blade (2) to switch from the unfolded state to the folded state.

6. The adaptive lift-drag type wind turbine blade according to claim 1, characterized in that, A second anti-rotation member (47) is fixed on the mounting bracket (1). The second anti-rotation member (47) is used to abut against the movable blade (22) to limit the maximum gap between the movable blade (22) and the fixed blade (21).

7. The adaptive lift-drag type wind turbine blade according to claim 1, characterized in that, The lifting blades adopt the symmetrical airfoil of the NACA model; The lifting blade has one-third to one-half of its tip to the tip removed on one side to form the fixed blade (21); the removed portion on the lifting blade forms a clearance groove (211) for accommodating the movable blade (22), the movable blade (22) being constructed as the removed portion of the lifting blade.

8. The adaptive lift-drag type wind turbine blade according to claim 1, characterized in that, The number of driving blades (2) is at least two; The adaptive lift-drag type wind turbine blade (100) also includes a synchronization component (6), which includes a linkage sliding member (61), a linkage cable (62), and at least two synchronization wheels (63). The synchronization wheels (63) and the pivot shaft (23) of the drive blade (2) are coaxially arranged. The linkage sliding member (61) is connected to the synchronization wheels (63) through the linkage cable (62) to drive multiple synchronization wheels (63) to rotate simultaneously. One end of the flexible cable (53) is connected to the inertial component (5), and the other end of the flexible cable (53) is connected to the linkage sliding component (61).

9. The adaptive lift-drag type wind turbine blade according to claim 8, characterized in that, The mounting bracket (1) is provided with a second guide rail (14) and a reversing roller (15). The second guide rail (14) is arranged in parallel with the first guide rail (11) on the mounting bracket (1), and the linkage sliding member (61) is slidably engaged on the second guide rail (14); The reversing roller (15) is disposed between the first guide rail (11) and the second guide rail (14), and the flexible cable (53) is tensioned on the reversing roller (15).

10. A vertical axis wind turbine generator, characterized in that, include: Spindle (200); A power generation device, wherein the main shaft (200) is connected to the power generation device; According to any one of claims 1-9, the adaptive lift-drag type wind turbine blade (100) includes a plurality of blades arranged circumferentially at intervals along the main shaft (200), and the mounting bracket (1) in the adaptive lift-drag type wind turbine blade (100) is fixedly connected to the main shaft (200) through the main shaft mounting part (13).

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