Blade and horizontal axis tidal energy generator

Abstract

The application discloses a blade and a horizontal shaft tidal current power generator, wherein the blade comprises a main blade, a supporting piece, a spoiler and a damping piece; the supporting piece is provided with a first mounting end and a connecting shaft connected with the first mounting end; the first mounting end is connected with the main blade; the spoiler is sleeved on the outer periphery of the connecting shaft; one end of the damping piece is adapted to be connected with the main blade; the other end of the damping piece is adapted to be connected with the spoiler; when the load borne by the spoiler changes, the spoiler rotates around the connecting shaft to change the included angle between the spoiler and the main blade; the damping piece generates a corresponding damping force, which is used for limiting the spoiler; the spoiler can realize passive variable pitch according to different loads, and does not need to use flow measuring equipment and active variable pitch equipment, thereby avoiding the influence of errors and faults of the flow measuring equipment and the active variable pitch equipment; and since the spoiler adopts mechanical passive variable pitch, various electronic instruments are not needed to participate in variable pitch, and the influence of the marine environment on the blade is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of renewable energy development, and particularly relates to a blade and a tidal current generator. BACKGROUND

[0002] The working principle of the tidal current generator is to capture tidal water kinetic energy through an impeller and convert it into rotary mechanical energy, and then transmit the rotary mechanical energy to a generator through a mechanical transmission device, so that the generator rotates to generate electric energy. The tidal current generator set generally operates in water with a depth of 30-50 m. During rotation, the blade is not only affected by the periodic change of the water flow caused by the rise and fall of the tide, but also affected by the shear flow. Therefore, the blade will be subjected to a periodically changing load every time the tidal current generator set rotates. At the same time, waves and turbulence will increase the volatility of the load on the blade. When the load on the blade is unstable, the fatigue load of the blade will increase, and the torque of the blade will also fluctuate accordingly, thereby causing the output power to fluctuate.

[0003] The existing tidal current generator set introduces an active variable pitch system, uses a flow measuring device to detect the flow rate of the water flow, and adjusts the pitch angle of the blade through the active variable pitch device to stabilize the output power and reduce the fatigue stress according to different water flow rates.

[0004] However, the flow measuring device and the active variable pitch device of the above-mentioned tidal current generator set are both in the marine environment, and are easily affected by errors and faults, so the reliability is low. SUMMARY

[0005] Therefore, the technical problem to be solved by the present application is that the flow measuring device and the active variable pitch device in the prior art are both in the marine environment, and are easily affected by errors and faults, so the reliability is low.

[0006] Therefore, the present application provides a blade, which comprises:

[0007] a main blade;

[0008] a support member having a first mounting end and a connecting shaft connected thereto, the first mounting end being connected to the main blade;

[0009] a spoiler sleeve set on the outer periphery of the connecting shaft;

[0010] a damping member, one end of which is adapted to be connected to the main blade, and the other end of which is adapted to be connected to the spoiler;

[0011] When the load on the spoiler changes, the spoiler rotates around the connecting shaft to change the included angle between the spoiler and the main blade, and the damping member generates a corresponding damping force, which is used to limit the spoiler.

[0012] Optionally, the vane as claimed in the preceding paragraph, wherein a plurality of first limiting protrusions are spaced apart on the outer periphery of the first mounting end, a first insertion slot is formed on the main vane, a plurality of first limiting grooves are spaced apart on the inner wall of the first insertion slot, the first mounting end is adapted to be inserted into the first insertion slot, and the first limiting protrusions are adapted to be inserted into the corresponding first limiting grooves.

[0013] Optionally, the vane as claimed in the preceding paragraph, further comprising a first insertion member, wherein the first insertion member is fixedly connected to the damping member, a plurality of second limiting protrusions are spaced apart on the outer periphery of the first insertion member, the first insertion member is adapted to be inserted into the first limiting grooves, and the second limiting protrusions are adapted to be inserted into the corresponding first limiting grooves.

[0014] Optionally, the vane as claimed in the preceding paragraph, further comprising a first limiting member, wherein the first limiting member is arranged between the spoiler and the connecting shaft, and part of the first limiting member protrudes out of the spoiler, the part of the first limiting member protruding out of the spoiler is fixedly connected to the main vane to limit the first limiting protrusions and the second limiting protrusions.

[0015] Optionally, the vane as claimed in the preceding paragraph, further comprising a second insertion member, wherein the second insertion member is fixedly connected to the side of the damping member away from the first insertion member, a plurality of third limiting protrusions are spaced apart on the outer periphery of the second insertion member, the spoiler has a second insertion slot, a plurality of second limiting grooves are spaced apart on the inner wall of the second insertion slot, the second insertion member is adapted to be inserted into the second insertion slot, and the third limiting protrusions are adapted to be inserted into the corresponding second limiting grooves.

[0016] Optionally, the vane as claimed in the preceding paragraph, further comprising a second limiting member, wherein the second limiting member is arranged between the first limiting member and the spoiler, and the second limiting member is fixedly connected to the spoiler, the second limiting member limits the third limiting protrusions.

[0017] Optionally, the vane as claimed in the preceding paragraph, further comprising a sealing member, wherein the sealing member is arranged between the connecting shaft and the spoiler, the sealing member is fixedly connected to the side of the spoiler away from the second limiting member, the first limiting member, the second limiting member, the sealing member, and the spoiler enclose a sealed cavity, and part of the connecting shaft is located in the sealed cavity.

[0018] Optionally, the vane as claimed in the preceding paragraph, further comprising a blade tip, wherein the blade tip is fixedly connected to the main vane, the support member has a second mounting end, a plurality of limiting recesses are spaced apart on the outer periphery of the second mounting end, the blade tip has a third insertion slot, a plurality of fourth limiting protrusions are spaced apart on the inner wall of the third insertion slot, the second mounting end is adapted to be inserted into the third insertion slot, and the limiting recesses are adapted to be inserted into the corresponding fourth limiting protrusions.

[0019] Optionally, in the above-mentioned blade, the cross section of the main blade is a first airfoil, the cross section of the spoiler is a second airfoil, and a portion of the first airfoil is the second airfoil.

[0020] The present invention also provides a horizontal axis tidal energy generator comprising the above blades.

[0021] The technical solution provided by the present invention has the following advantages:

[0022] 1. The blade provided by the present invention comprises a main blade, a support member, a spoiler and a damping member, the support member having a first mounting end and a connecting shaft connected thereto, the first mounting end being connected to the main blade, and the spoiler being sleeved on the outer circumference of the connecting shaft; one end of the damping member is suitable for being connected to the main blade, and the other end of the damping member is suitable for being connected to the spoiler, when the load on the spoiler changes, the spoiler rotates around the connecting shaft to change the angle between the spoiler and the main blade, and the damping member generates a corresponding damping force, which is used to limit the spoiler; under the action of different loads, the angle between the spoiler and the main blade can be different, that is, the spoiler can realize passive pitch change according to different loads, without the need for flow measuring equipment and active pitch change equipment, thereby avoiding the influence of errors and failures of the flow measuring equipment and the active pitch change equipment, and because the spoiler adopts mechanical passive pitch change, without the participation of various electronic instruments in pitch change, reducing the influence of the marine environment on the blade, thereby improving the reliability of the passive pitch change of the blade.

[0023] 2. The blade provided by the present invention has a first mounting end plugged into a first plug-in groove, and a first limiting protrusion plugged into a corresponding first limiting groove. The plug-in method makes it convenient to assemble the blade, and this installation method avoids the use of underwater welding, thereby improving installation efficiency.

[0024] 3. The blade provided by the present invention comprises a first limit member, a second limit member, a seal member and a spoiler, which together form a sealed cavity, and part of the connecting shaft is located in the sealed cavity. Since the blade operates in a marine environment, a sealed cavity is used to protect the connecting shaft to prevent the connecting shaft from rusting, which would weaken the passive pitch control capability of the spoiler.

[0025] 4. The blade provided by the present invention has a main blade with a cross-section of a first airfoil, a spoiler with a cross-section of a second airfoil, and a portion of the first airfoil being the second airfoil, i.e., a smooth transition between the spoiler and the main blade, which enhances the overall aesthetics of the blade.

[0026] 5. The horizontal axis tidal energy generator provided by the present invention can reduce the impact of the change in angle of attack caused by the change in load on the blades through the passive pitch control of the spoiler when the load on the blades changes, thereby reducing the fatigue load and torque fluctuation of the blades, so that the horizontal axis tidal energy generator can output power stably. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 A schematic structural diagram of a blade provided by the present invention;

[0029] Figure 2 A cross-sectional view of a blade provided by the present invention;

[0030] Figure 3 for Figure 2 A partial enlarged schematic diagram of the middle circle A;

[0031] Figure 4 for Figure 2 A partial enlarged schematic diagram of the middle circle B;

[0032] Figure 5 An exploded schematic diagram of the blade provided in the present invention with the main blade, spoiler and blade tip removed;

[0033] Figure 6 A schematic diagram of a main blade provided for the blade of the present invention;

[0034] Figure 7 A schematic diagram of a spoiler provided for a blade in the present invention;

[0035] Figure 8 A schematic diagram of another perspective of the spoiler provided by the blade of the present invention;

[0036] Figure 9 A schematic diagram of a blade tip provided for a blade in the present invention;

[0037] Figure 10 This is a principle diagram when the load on the blade in the present invention is the rated load;

[0038] Figure 11 This is a principle diagram when the load on the blade exceeds the rated load in the present invention.

[0039] Description of reference numerals:

[0040] 1. Main blade; 11. First slot; 12. First limit slot;

[0041] 2. Support member; 21. First mounting end; 211. First limiting protrusion; 22. Connecting shaft; 23. Second mounting end; 231. Limiting groove;

[0042] 3. spoiler; 31. second slot; 32. second limit slot;

[0043] 4. Damping parts;

[0044] 5. First connector; 51. Second limiting protrusion;

[0045] 61. First limiting member; 62. Second limiting member; 63. Sealing member;

[0046] 7. Second connector; 71. Third limiting protrusion;

[0047] 8. Blade tip; 81. Third slot; 82. Fourth limiting protrusion. DETAILED DESCRIPTION

[0048] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0049] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0050] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0051] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0052] Example 1

[0053] This embodiment provides a blade, such as Figures 1 to 9As shown, it includes a main blade 1, a support member 2, a spoiler 3 and a damping member 4. The support member 2 has a first mounting end 21 and a connecting shaft 22 connected thereto. The first mounting end 21 is connected to the main blade 1, and the spoiler 3 is sleeved on the outer periphery of the connecting shaft 22; one end of the damping member 4 is suitable for connecting to the main blade 1, and the other end of the damping member 4 is suitable for connecting to the spoiler 3. When the load on the spoiler 3 changes, the spoiler 3 rotates around the connecting shaft 22 to change the angle between the spoiler 3 and the main blade 1, and the damping member 4 generates a corresponding damping force, which is used to limit the spoiler 3.

[0054] The blade provided in this embodiment can have different angles between the spoiler 3 and the main blade 1 under the action of different loads. The spoiler 3 can achieve passive pitch control according to the different loads, without the need to use flow measuring equipment and active pitch control equipment, thereby avoiding the influence of errors and failures of the flow measuring equipment and the active pitch control equipment. Moreover, since the spoiler 3 adopts mechanical passive pitch control, there is no need for various electronic instruments to participate in the pitch control, which reduces the influence of the marine environment on the blade, thereby improving the reliability of the passive pitch control of the blade.

[0055] like Figure 1 、 Figure 2 、 Figure 3 and Figure 6 As shown, the blade provided in this embodiment also includes a first connector 5 and a first stopper 61. The cross section of the main blade 1 is a first airfoil, and the first airfoil is an asymmetric airfoil; the cross section of the spoiler 3 is a second airfoil, and the second airfoil is a symmetric airfoil, and part of the first airfoil is the second airfoil, that is, the main blade 1 and the spoiler 3 have a smooth transition, which increases the overall aesthetics of the blade. Figure 6Taking the perspective of as an example, a "┌"-shaped notch is provided on the main blade 1, and a first slot 11 is provided at the root of the right side of the notch. The first slot 11 is a circular slot, and a first limiting slot 12 is provided along the axial direction of the first slot 11. The first limiting slot 12 is a rectangular slot, and multiple first limiting slots 12 are spaced apart on the inner wall of the first slot 11. Multiple first limiting slots 12 and the first slot 11 are combined to form a first spline groove; the first mounting end 21 is a cylinder, and multiple first limiting protrusions 211 are spaced apart on the outer periphery of the first mounting end 21. The first limiting protrusion 211 is a rectangular block, and the first mounting end 21 and the multiple first limiting protrusions 211 are integrally formed, that is, the first spline, and the first mounting end 21 is plugged into the first slot 11. At the same time, the first limiting protrusion 211 is plugged into the corresponding first limiting slot 12, that is, the first spline is plugged into the first spline groove. The first connector 5 is a circular ring, which is welded and fixed to the damping member 4, and a plurality of second limiting protrusions 51 are spaced apart on the outer circumference of the circular ring. The second limiting protrusions 51 are also rectangular blocks. The first connector 5 and the second limiting protrusions 51 are integrally formed, that is, the second spline. The first connector 5 is plugged into the first slot 11, and the second limiting protrusion 51 is plugged into the corresponding first limiting groove 12, that is, the second spline is plugged into the first spline groove, and the first spline and the second spline are both located in the first spline groove. The cooperation between the spline and the spline groove prevents the support member 2 and the first connector 5 from rotating relative to the main blade 1. A first flange connection groove is also defined at the root of the right side of the notch. The first flange connection groove is a circular groove, concentric with the first slot 11, and has a diameter greater than that of the first slot 11. A first stopper 61 is integrally formed from a first flange and a first cylindrical member. The first flange is fixedly connected to the first flange connection groove by bolts. The inner diameter of the first flange is equal to the diameter of the first slot 11. The first stopper protrusion 211 and the second stopper protrusion 51 are positioned by the first flange to prevent the first connector 5 and the first mounting end 21 from falling out of the first slot 11. When the first flange is secured to the first flange connection groove, the first flange is flush with the right side of the notch, the first cylindrical member is located outside the first flange connection groove, and the first cylindrical member is partially sleeved over the damping member 4. A static seal is provided between the first stopper 61 and the first flange connection groove to prevent seawater from entering the first slot 11.

[0056] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 7 As shown, the blade provided in this embodiment also includes a second connector 7, a second stopper 62 and a seal 63. The root of the spoiler 3 is provided with an axial hole, and the connecting shaft 22 is passed through the axial hole. Figure 3Taking the perspective of as an example, a second slot 31 is further provided at the root of the left side of the spoiler 3. The second slot 31 is a circular slot. The second slot 31 is concentric with the shaft hole. The diameter of the second slot 31 is larger than the diameter of the shaft hole, and the diameter of the second slot 31 is equal to the diameter of the first slot 11. A second limiting slot 32 is provided along the axial direction of the second slot 31. The second limiting slot 32 is a rectangular slot. A plurality of second limiting slots 32 are spaced apart on the inner wall of the second slot 31. A plurality of second limiting slots 32 and a second slot 31 are combined. The second connector 7 is also a circular ring, welded to the side of the damping element 4 facing away from the first connector 5. The damping element 4 is a torsion spring. A plurality of third stopper protrusions 71 are spaced apart on the outer circumference of the circular ring. The third stopper protrusions 71 are also rectangular blocks. The second connector 7 and the third stopper protrusions 71 are integrally formed, forming a third spline. The second connector 7 engages with the second slot 31, and the third stopper protrusions 71 engage with the corresponding second stopper slot 32, i.e., the third spline engages with the second spline slot. The length of the second stopper slot 32 is greater than the length of the third stopper protrusion 71, i.e., the third stopper protrusion 71 can move within the second stopper slot 32. A first receiving groove is also defined at the base of the left side of the spoiler 3. The diameter of the first receiving groove is greater than the outer diameter of the first cylindrical element. A portion of the first cylindrical element is located within the first receiving groove. A first bearing seat is provided on the outer circumference of the first cylindrical element. The first bearing is sleeved on the first bearing seat, i.e., the first bearing is located within the first receiving groove. A second flange connection groove is also provided at the root of the left side of the spoiler 3. The second flange connection groove is also a circular groove, and the second flange connection groove is concentric with the second slot 31. The diameter of the second flange connection groove is larger than the diameter of the first accommodating groove. The second limiting member 62 is integrally formed by the second flange plate and the second cylindrical member. The second limiting member 62 is a dynamic seal. The second flange plate is fixedly connected to the second flange connection groove by bolts. The second cylindrical member is sleeved on the outer circumference of part of the first cylindrical member. Part of the first cylindrical member, the second cylindrical member and the first bearing are all located in the first accommodating groove. The inner diameter of the first cylindrical member is equal to the diameter of the second slot 31. The third limiting protrusion 71 is limited by the first bearing and the first cylindrical member to prevent the second connector 7 from falling off from the second slot 31. The second limiting member 62 is a dynamic seal 63 to prevent seawater from entering the first slot 11 and the second slot 31.

[0057] like Figure 4 、 Figure 5 、 Figure 8 As shown, the blade provided in this embodiment further includes a seal 63, which is also a dynamic seal. The seal 63 is formed integrally by the third flange and the third cylindrical member. Figure 4The right side of the spoiler 3 is provided with a third flange connecting groove and a second accommodating groove, both of which have the same center as the shaft hole. The diameter of the third flange connecting groove is larger than that of the second accommodating groove. The third flange plate is fixedly connected with the third flange connecting groove through bolts. The third cylindrical part is located in the second accommodating groove, and a second bearing is arranged between the bottom of the second accommodating groove and the third cylindrical part. The connecting shaft 22 is provided with a second bearing seat, and the second bearing is sleeved on the second bearing seat. A static seal is further arranged between the third flange plate and the third flange connecting groove. The second limiting part 62, the sealing part 63, the spoiler 3 and the first limiting part 61 form a sealed cavity, part of the connecting shaft 22 is located in the sealed cavity, and the seawater is prevented from entering the sealed cavity. The sealed cavity can be filled with lubricating oil during installation, so as to reduce the friction between the spoiler 3, the first limiting part 61 and the connecting shaft 22.

[0058] As shown in Figure 1 , Figure 2 and Figure 8 , the blade provided by the embodiment further includes a blade tip 8, the cross section of the blade tip 8 is also a first airfoil, the blade tip 8 is fixedly connected with the main blade 1 through welding, the supporting part 2 has a second mounting end 23, the first mounting end 21 and the second mounting end 23 are respectively located at two ends of the connecting shaft 22, the second mounting end 23 is a cylinder, a plurality of limiting grooves 231 are distributed at intervals on the outer periphery of the second mounting end 23, the limiting grooves 231 are rectangular grooves, the blade tip 8 has a third insertion groove 81, the third insertion groove 81 is a circular groove, a plurality of fourth limiting protrusions 82 are distributed at intervals on the inner wall of the third insertion groove 81, the second mounting end 23 is inserted into the third insertion groove 81, the limiting grooves 231 are inserted into the corresponding fourth limiting protrusions 82, and the fourth limiting protrusions 82 further prevent the supporting part 2 from rotating relative to the main blade 1.

[0059] The installation process of the blade provided by the embodiment is as follows:

[0060] First, the first limiting member 61 is sleeved on the outer periphery of the damping member 4, and the second limiting member 62 is sleeved on the outer periphery of part of the first cylindrical member, the first bearing member is sleeved on the first bearing seat, and the first connector 5 and the second connector 7 are respectively welded to the two ends of the damping member 4, and then the second connector 7 is inserted into the second slot 31. At the same time, the third limiting protrusion 71 is inserted into the second limiting groove 32 until the first bearing abuts against the bottom of the second receiving groove, and the second flange is connected to the second flange groove by bolts. The bottom is fixedly connected, and then the second mounting end 23 of the support member 2 is sequentially passed through the first plug-in member 5, the damping member 4, the second plug-in member 7 and the shaft hole, and extended out of the shaft hole until the first mounting end 21 abuts against the first plug-in member 5, and then the first plug-in member 5 is twisted one circle so that the first limiting protrusion 211 and the corresponding second limiting protrusion 51 are re-overlapped. At this time, the damping member 4 has a corresponding damping force, and then the first mounting end 21 and the first plug-in member 5 are gradually inserted into the first plug-in slot. When the first stop protrusion 211 and the second stop protrusion 51 are gradually inserted into the first stop groove 12 until the first mounting end 21 abuts against the bottom of the first slot 11, and the first flange is fixedly connected to the bottom of the first flange connecting groove by bolts; then the second bearing is sleeved outside the second mounting end 23, and the second bearing is pushed toward the spoiler 3 until the second bearing abuts against the bottom of the second accommodating groove. At this time, the second bearing is sleeved on the outer circumference of the second bearing seat, and then the third cylindrical member is sleeved outside the second mounting end 23, and the third cylindrical member is pushed toward the spoiler 3 until the second cylindrical member abuts against the second bearing. At this time, the third flange abuts against the bottom of the third flange connecting groove, and the third flange is fixedly connected to the bottom of the third flange connecting groove by bolts. Finally, the third slot 81 is sleeved on the outer circumference of the second mounting end 23, and the fourth protrusion is plugged into the limiting groove 231, pushing the blade tip 8 close to the spoiler 3 until the blade tip 8 also abuts against the main blade 1, and the blade tip 8 is welded to the main blade 1 to complete the installation.

[0061] When the load on the blade is the rated load, Figure 10 As shown, the angle of attack is α, which is the angle between the incoming flow velocity U and the airfoil chord NA. The torque formed by the damping force applied by the damping member 4 to the spoiler 3 is M, and the torque applied by the rated load on the spoiler 3 to rotate around the connecting shaft 22 is Mr. At this time, Mr and M are equal in magnitude and opposite in direction, and the spoiler 3 is under force balance and does not deflect.

[0062] When the load on the blade is greater than the rated load, the angle of attack α changes due to the flow velocity fluctuation, and the lift force on the blade as a whole increases. The lift force on the spoiler 3 also increases, and its rotational torque around the connecting shaft 22 increases to Mr1, exceeding the initial torque Mr. Figure 11As shown, the guide plate rotates upward about the connecting shaft 22, thereby reducing the angle of attack of the spoiler 3 and indirectly reducing the impact of the increase in the overall blade angle of attack α+∆α on the overall blade force, thereby reducing blade fatigue load and unit power fluctuation. At the same time, the torsion angle of the damping element 4 caused by the rotation of the spoiler 3 increases, and the rotational torque applied by the damping element 4 on the spoiler 3 increases, exceeding M. When M increases to equal Mr1 again, the forces on the spoiler 3 reach equilibrium again, and the movement of the spoiler 3 stops.

[0063] When the load on the blade is less than the rated load, the angle of attack α becomes smaller, the lift on the blade as a whole becomes smaller, the lift on the spoiler also becomes smaller, the rotational moment around the connecting shaft 22 decreases, and the spoiler rotates downward around the connecting shaft 22, thereby increasing the angle of attack of the spoiler, offsetting part of the effect of the reduction in the overall lift of the blade caused by the reduction in the load on the blade.

[0064] Example 2

[0065] This embodiment provides a horizontal axis tidal energy generator, comprising the blades in embodiment 1, which are mounted on the hub of a tidal energy generator set.

[0066] The horizontal-axis tidal energy generator provided in this embodiment exhibits a linear relationship between the fatigue load reduction (i.e., the reduction in the amplitude of blade load fluctuation) and L1 / L0, where L1 is the chord length of the spoiler 3 and L0 is the chord length of the main blade 1. The chord length is the straight-line distance between the tip and tail of the airfoil. When L1 / L0 = 0.25, the horizontal-axis tidal energy generator can reduce the fatigue load on the blade in that area by approximately 25%. The passive pitch control of the spoiler can also reduce torque fluctuation by approximately 50%, thereby reducing power fluctuation by 50%. The thrust at the root and tip 8 of the main blade is generally low, and has a minimal impact on the fatigue load of the entire blade. Therefore, the spoiler 3 of the horizontal-axis tidal energy generator is preferably installed in the middle of the main blade, toward the tip 8. The specific positional relationship is r=0.5. As an alternative implementation, r is greater than or equal to 0.3 and less than or equal to 0.9. r is the proportional relationship between the distance between the center of the hub and each part of the blade. When r=0, it represents the center of the hub, and when r=1, it represents the proportional relationship between the blade tip and the center of the hub.

[0067] The horizontal axis tidal energy generator provided in this embodiment can install multiple spoilers 3 on the same blade to accurately control the fatigue load at different radial positions of the blade and achieve fatigue load adjustment at various local positions.

[0068] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A blade, characterized in that: include: Main blade (1); A support member (2), the support member (2) having a first mounting end (21) and a connecting shaft (22) connected thereto, the first mounting end (21) being connected to the main blade (1); A spoiler (3), wherein the spoiler (3) is sleeved on the outer periphery of the connecting shaft (22); a damping member (4), one end of the damping member (4) being adapted to be connected to the main blade (1), and the other end of the damping member (4) being adapted to be connected to the spoiler (3); When the load on the spoiler (3) changes, the spoiler (3) rotates around the connecting shaft (22) to change the angle between the spoiler (3) and the main blade (1), and the damping member (4) generates a corresponding damping force, which is used to limit the spoiler (3); A plurality of first limiting protrusions (211) are spaced apart on the outer periphery of the first mounting end (21); a first slot (11) is provided on the main blade (1); a plurality of first limiting grooves (12) are spaced apart on the inner wall of the first slot (11); the first mounting end (21) is suitable for being plugged into the first slot (11); and the first limiting protrusions (211) are suitable for being plugged into the corresponding first limiting grooves (12); The first connector (5) is fixedly connected to the damping member (4), and a plurality of second limiting protrusions (51) are spaced apart on the outer periphery of the first connector (5), the first connector (5) is suitable for being plugged into the first limiting groove (12), and the second limiting protrusions (51) are suitable for being plugged into the corresponding first limiting groove (12); The main blade (1) further comprises a first limiting member (61), the first limiting member (61) being arranged between the spoiler (3) and the connecting shaft (22), and a portion of the first limiting member (61) extending outside the spoiler (3), and the portion of the first limiting member (61) extending outside the spoiler (3) being fixedly connected to the main blade (1) to limit the first limiting protrusion (211) and the second limiting protrusion (51); The invention also includes a second connector (7), which is fixedly connected to the side of the damping member (4) away from the first connector (5), and a plurality of third limiting protrusions (71) are spaced apart on the outer periphery of the second connector (7). The spoiler (3) has a second slot (31), and a plurality of second limiting grooves (32) are spaced apart on the inner wall of the second slot (31). The second connector (7) is plugged into the second slot (31), and the third limiting protrusions (71) are plugged into the corresponding second limiting grooves (32).

2. The blade according to claim 1, characterized in that The invention also includes a second limiting member (62), which is arranged between the first limiting member (61) and the spoiler (3), and the second limiting member (62) is fixedly connected to the spoiler (3), and the second limiting member (62) limits the third limiting protrusion (71).

3. The blade according to claim 2, characterized in that The invention also includes a sealing member (63), wherein the sealing member (63) is arranged between the connecting shaft (22) and the spoiler (3), and the sealing member (63) is fixedly connected to the side of the spoiler (3) away from the second limiting member (62); the first limiting member (61), the second limiting member (62), the sealing member (63) and the spoiler (3) enclose a sealed cavity, and a portion of the connecting shaft (22) is located in the sealed cavity.

4. The blade according to any one of claims 1 to 3, characterized in that The invention also includes a blade tip (8), wherein the blade tip (8) is fixedly connected to the main blade (1); the support member (2) has a second mounting end (23); a plurality of limiting grooves (231) are spaced apart on the outer periphery of the second mounting end (23); the blade tip (8) has a third slot (81); a plurality of fourth limiting protrusions (82) are spaced apart on the inner wall of the third slot (81); the second mounting end (23) is suitable for being plugged into the third slot (81); and the limiting grooves (231) are suitable for being plugged into the corresponding fourth limiting protrusions (82).

5. The blade according to claim 4, characterized in that The cross section of the main blade (1) is a first airfoil, the cross section of the spoiler (3) is a second airfoil, and a portion of the first airfoil is the second airfoil.

6. A horizontal axis tidal current energy generator, characterized in that: The blade comprises the blade according to any one of claims 1 to 5.

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