Fan blade support structure and vertical axis wind turbine

Abstract

The utility model relates to wind driven generator technical field discloses a fan blade support structure and vertical shaft wind driven generator, include: main shaft, blade assembly and support mechanism, blade assembly includes a plurality of interval settings blade along the circumference of main shaft, support mechanism includes interval settings first support piece and second support piece along the axial direction of main shaft, and support piece includes: carousel and a plurality of connecting arm, carousel sets up in main shaft, a plurality of connecting arms interval settings along the circumference of carousel, and the top end of blade is connected with the one end of connecting arm of first support piece away from carousel, and the bottom end of blade is connected with the one end of connecting arm of second support piece away from carousel, the utility model discloses through the support piece of setting up up and down along main shaft, fixes and connects the top end and bottom end of blade respectively in main shaft, installs firmly under the premise of not destroying the streamline structure of blade, reduces the wind resistance of blade in the rotation process, improves the wind energy utilization rate and power generation efficiency of wind driven generator.

Description

Technical Field

[0001] This utility model relates to the field of wind turbine technology, specifically to a wind turbine blade support structure and a vertical axis wind turbine. Background Technology

[0002] Vertical axis wind turbines, as devices that utilize wind energy to generate electricity, are widely used in areas rich in wind resources, such as plains, mountains, coastlines, and cities. The basic structure of a vertical axis wind turbine includes multiple airfoil blades symmetrically arranged along the main axis, a blade support structure, a rotor shaft, and a transmission system connecting to the generator. During operation, the blades rotate around the vertical main axis under the influence of wind power, and the resulting rotational kinetic energy is transferred to the generator through the main shaft, completing the conversion of wind energy into electrical energy. As a key component directly interacting with wind energy, the installation method and structural strength of the blades play a decisive role in the overall performance of the turbine. The blade support structure, as a crucial bridge connecting the blades and the main shaft, must not only withstand the complex conditions generated during blade operation, such as centrifugal force, wind load, and vibration impact, but also ensure the installation accuracy, rigidity, and dynamic balance of the blades. Therefore, the connection method between the blades and the blade support structure of a vertical axis wind turbine is a key issue in improving the power generation efficiency of the wind turbine.

[0003] In existing vertical axis wind turbines, the blade support structure generally uses pre-drilled mounting holes on the blade surface, with the blades fixed to the support frame using bolts. However, setting mounting holes on the blade surface disrupts the overall blade structure and weakens its strength. Furthermore, exposed bolts and other connectors alter the streamlined profile of the blade surface, significantly increasing wind resistance and reducing the aerodynamic efficiency and wind power conversion efficiency of the wind turbine, thus affecting its power generation efficiency. Utility Model Content

[0004] In view of this, the present invention provides a wind turbine blade support structure and a vertical axis wind turbine generator to solve the problems of poor integrity and low power generation efficiency of existing vertical axis wind turbine generator blade structures.

[0005] In a first aspect, this utility model provides a wind turbine blade support structure, comprising:

[0006] spindle;

[0007] A blade assembly, the blade assembly comprising a plurality of blades spaced circumferentially along the main shaft;

[0008] A support mechanism includes a first support member and a second support member spaced apart along the axial direction of the main shaft. Each support member includes a turntable and a plurality of connecting arms. The turntable is disposed on the main shaft, and the plurality of connecting arms are spaced apart circumferentially along the turntable. The top end of a blade is connected to the end of the connecting arm of the first support member away from the turntable, and the bottom end of the blade is connected to the end of the connecting arm of the second support member away from the turntable.

[0009] Beneficial effects

[0010] The tip and bottom of the blade are connected to the first and second supports, respectively, effectively avoiding the need to directly drill mounting holes on the blade surface. This maintains the integrity of the blade surface structure, effectively reduces flutter and resonance during blade rotation, prevents weakening of blade strength, and reduces wind resistance. Simultaneously, the supports create a symmetrical arrangement of the blades around the main shaft, improving the rigidity and dynamic balance of the blade support structure.

[0011] In one alternative embodiment, the wind turbine blade support structure further includes a tensioning mechanism, which includes a fixed plate and a plurality of cables. The fixed plate is connected to the top end of the main shaft, and the plurality of cables are spaced apart circumferentially along the fixed plate. One end of each cable is connected to the fixed plate, and the other end is connected to the top end of one of the blades.

[0012] Beneficial effects

[0013] Multiple cables are circumferentially arranged on the fixed plate, connecting the plate to the tips of each blade. During wind turbine operation, these cables provide tension to the blades, further enhancing their positioning stability and structural rigidity. The cables effectively resist wind loads and centrifugal forces generated by blade rotation, reducing blade sway during operation. Furthermore, the tensioning mechanism can adjust the tension of each blade to a certain extent, ensuring balanced force distribution and improving the dynamic balance and operational smoothness of the blade support structure.

[0014] In one optional embodiment, connecting plates are provided at both ends of the cable, and the connecting plates are fixedly connected to the top of the fixed disc and the blade.

[0015] In one alternative embodiment, the cable includes a first pull rope and a second pull rope, and the first pull rope and the second pull rope are connected by a locking device.

[0016] In one optional embodiment, the locking device includes a locking nut and a locking bolt, wherein the bottom end of the first pull rope and the top end of the second pull rope are respectively provided with locking bolts, and the locking bolts on the first pull rope and the second pull rope are respectively screwed to both ends of the locking nut.

[0017] Beneficial effects

[0018] The locking nut and locking bolt together form a locking device, which realizes a reliable connection between the first and second pull ropes, and facilitates the tension adjustment of the blades, thus improving the adaptability of the tensioning mechanism.

[0019] In one optional embodiment, the connecting arm includes a connecting component and a fixing component connected to each other. The fixing component has multiple through holes, and the top and bottom ends of the blade have multiple threaded holes respectively. The connecting bolt passes through the through holes and is screwed into the threaded holes.

[0020] In one alternative embodiment, the width of the connecting member gradually decreases from the end near the turntable to the end near the fixing member.

[0021] Beneficial effects

[0022] The width of the connecting arm gradually decreases from the end near the turntable to the end near the fixed component, so that while maintaining sufficient strength, the connecting arm reduces its obstruction of airflow and reduces the wind resistance encountered by the support mechanism during rotation.

[0023] In one alternative embodiment, reinforcing ribs are provided on the top and bottom surfaces of the support member.

[0024] Beneficial effects

[0025] Reinforcing ribs can significantly improve the structural strength and deformation resistance of the support components, preventing them from breaking when subjected to wind loads, centrifugal forces, and vibration impacts generated during blade rotation. At the same time, reinforcing ribs can evenly distribute stress on the support components, improving their fatigue life.

[0026] In one optional embodiment, the reinforcing rib includes: annular reinforcing members and plate-shaped reinforcing members, wherein the annular reinforcing members are coaxially arranged with the turntable, and one plate-shaped reinforcing member is provided on the top and bottom surfaces of each connecting arm.

[0027] Secondly, this utility model also provides a vertical axis wind turbine generator, including the aforementioned wind turbine blade support structure, and further including: a tower, a connecting cylinder, a generator, and a speed increaser. The bottom end of the connecting cylinder is connected to the top end of the tower. The connecting cylinder has a cavity. The generator and the speed increaser are disposed in the cavity, and the speed increaser is located above the generator. The bottom end of the main shaft is connected to the top end of the speed increaser, and the bottom end of the speed increaser is connected to the input end of the generator.

[0028] Beneficial effects

[0029] The connecting cylinder has an internal cavity to accommodate the generator and the speed increaser. The speed increaser is located above the generator, and the bottom end of the main shaft is connected to the speed increaser. The speed increaser is connected to the generator, so that after the wind energy drives the main shaft to rotate through the blades, the energy is efficiently transferred to the generator through the speed increaser, which improves the efficiency of wind power generation. Attached Figure Description

[0030] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the structure of a vertical axis wind turbine according to an embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram of the wind turbine blade support structure according to an embodiment of the present utility model;

[0033] Figure 3 for Figure 1 A magnified view of part A in the diagram;

[0034] Figure 4 for Figure 1 A magnified view of part B in the diagram.

[0035] Explanation of reference numerals in the attached figures:

[0036] 1. Spindle;

[0037] 21. Leaves;

[0038] 31. First support member; 32. Second support member; 311. Turntable; 312. Connecting arm; 3121. Connecting component; 3122. Fixing component; 3123. Connecting bolt; 313. Reinforcing rib; 3131. Ring-shaped reinforcing member; 3132. Plate-shaped reinforcing member;

[0039] 41. Fixed plate; 42. Cable; 421. First cable; 422. Second cable; 43. Connecting plate; 44. Locking device.

[0040] 5. Tower;

[0041] 6. Connecting cylinder;

[0042] 7. Generator;

[0043] 8. Speed ​​increaser. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0045] The following is combined Figures 1 to 4 The following describes embodiments of the present invention.

[0046] According to an embodiment of the present invention, a fan blade 21 support structure is provided, comprising: a main shaft 1, a blade 21 assembly, and a support mechanism. The blade 21 assembly includes a plurality of blades 21 spaced apart circumferentially along the main shaft 1. The support mechanism includes a first support member 31 and a second support member 32 spaced apart axially along the main shaft 1. The support member includes: a turntable 311 and a plurality of connecting arms 312. The turntable 311 is disposed on the main shaft 1, and the plurality of connecting arms 312 are spaced apart circumferentially along the turntable 311. The top end of the blade 21 is connected to the end of the connecting arm 312 of the first support member 31 away from the turntable 311, and the bottom end of the blade 21 is connected to the end of the connecting arm 312 of the second support member 32 away from the turntable 311.

[0047] Specifically, the blade 21 assembly includes multiple blades 21, which are symmetrically spaced along the circumference of the main shaft 1. Each blade 21 is an airfoil. A first support member 31 and a second support member 32 are axially spaced along the main shaft 1 and connected to the top and bottom ends of the blades 21, respectively. Each support member includes a circular turntable 311 and multiple connecting arms 312, with each connecting arm 312 corresponding to the top or bottom end of one blade 21. The turntable 311 is coaxially mounted on the main shaft 1, and the multiple connecting arms 312 are symmetrically welded to the turntable 311 along its circumference. In this embodiment, three connecting arms 312 are provided on the support member, and the first support member 31 and the second support member 32 are correspondingly connected to three blades 21.

[0048] The top and bottom ends of blade 21 are connected to connecting arms 312 on the upper and lower supports, respectively, to secure blade 21, avoiding the need for mounting holes on the blade 21 surface and maintaining the overall structural integrity of blade 21. Connecting the top and bottom ends of blade 21 enhances its structural strength without affecting its streamlined shape, helping to reduce wind resistance during rotation and improve wind energy capture efficiency.

[0049] In one embodiment, the connecting arm 312 includes a connecting component 3121 and a fixing component 3122 connected to each other. The fixing component 3122 has multiple through holes, and the top and bottom ends of the blade 21 have multiple threaded holes respectively. The connecting bolt 3123 passes through the through holes and is screwed into the threaded holes.

[0050] Specifically, each connecting arm 312 includes a connecting component 3121 and a fixing component 3122. One end of the connecting component 3121 is welded to the turntable 311, and the other end is welded to the fixing component 3122. The fixing component 3122 is adapted to the shape of the top or bottom end of the blade 21, and two through holes are respectively opened at both ends of the fixing component 3122. Correspondingly, two threaded holes matching the positions of the through holes are opened on the top and bottom surfaces of the blade 21. The fixing component 3122 fits against the top or bottom surface of the blade 21, and the connecting bolt 3123 passes through the through holes on the fixing component 3122 in sequence and is screwed into the threaded holes on the blade 21, so as to achieve reliable fixing of the blade 21 and the connecting arm 312.

[0051] In one embodiment, the width of the connecting member 3121 gradually decreases from the end near the turntable 311 to the end near the fixing member 3122.

[0052] Specifically, the width of the connecting component 3121 gradually decreases from the end near the turntable 311 to the end away from the turntable 311 and closer to the fixed component 3122. Under the premise of satisfying mechanical strength, the lateral width of the connecting component 3121 at the end near the fixed component 3122 is reduced, the obstruction to the airflow is reduced, and the overall aerodynamic performance of the blade 21 support structure is improved.

[0053] In one embodiment, reinforcing ribs 313 are provided on the top and bottom surfaces of the support member.

[0054] Specifically, reinforcing ribs 313 are welded to the top and bottom surfaces of the support component, effectively improving its bending and torsional resistance. The reinforcing ribs 313 on the top and bottom surfaces of the support component are symmetrically arranged to enhance the overall stress balance and structural rigidity of the support component.

[0055] In one embodiment, the reinforcing rib 313 includes an annular reinforcing member 3131 and a plate-shaped reinforcing member 3132. The annular reinforcing member 3131 is coaxially arranged with the turntable 311, and a plate-shaped reinforcing member 3132 is provided on the top and bottom surfaces of each connecting arm 312.

[0056] Specifically, an annular reinforcing member 3131 is disposed on the turntable 311 and arranged coaxially with the turntable 311, forming a circular structure. It is firmly welded to the turntable 311, effectively enhancing the radial and circumferential rigidity of the turntable 311 and improving its ability to withstand centrifugal force and torsional moment. A plate-shaped reinforcing member 3132 is disposed on each connecting arm 312, forming a strip structure, extending along the length of the connecting arm 312, and connected to the outer wall of the annular reinforcing member 3131. A plate-shaped reinforcing member 3132 is disposed on the top and bottom surfaces of each connecting arm 312 to enhance the bending and shear resistance of the connecting arm 312 and prevent deformation of the connecting arm 312 caused by the force on the blade 21.

[0057] In one embodiment, the wind turbine blade 21 support structure further includes a tensioning mechanism, which includes a fixed plate 41 and a plurality of cables 42. The fixed plate 41 is connected to the top end of the main shaft 1, and the plurality of cables 42 are spaced apart circumferentially along the fixed plate 41. One end of each cable 42 is connected to the fixed plate 41, and the other end is connected to the top end of a blade 21.

[0058] Specifically, the top end of the main shaft 1 is welded and fixed to the bottom end of the fixed disk 41. Multiple cables 42 are symmetrically distributed around the circumference of the fixed disk 41. One end of each cable 42 is fixedly connected to the edge of the fixed disk 41, and the other end extends to the top end of the blade 21 and is fixedly connected to it.

[0059] During the rotation of blade 21, cable 42 tensions blade 21, offsetting some of the structural deformation caused by wind load and rotational centrifugal force, thus improving the blade 21's anti-sway capability. At the same time, cable 42 also enhances the rigidity and vibration resistance of the entire blade 21 support structure, enabling the blade 21 support structure to maintain good dynamic stability when rotating under high wind speeds and complex operating conditions.

[0060] In one embodiment, both ends of the cable 42 are provided with connecting plates 43, which are fixedly connected to the top of the fixed disk 41 and the blade 21.

[0061] Specifically, the upper end of the cable 42 is connected to the fixed plate 41 via a connecting plate 43 with through holes. The connecting plate 43 is a metal plate welded to the top surface of the fixed plate 41, and has at least one through hole. One end of a bolt passes through the through hole in the connecting plate 43 and is screwed and locked to the fixed plate 41. The lower end of the cable 42 is connected to the top of the blade 21 via a connecting plate 43 with the same structure. The connecting plate 43 is welded to the top surface of the fixed component 3122. The connecting plate 43 and the fixed component 3122 have corresponding through holes. Bolts pass through the connecting plate 43 and the fixed component 3122 and are screwed and locked to the top of the blade 21.

[0062] In other embodiments, the two ends of the cable 42 can also be connected to the top of the fixed plate 41 and the blade 21 via an anchoring structure. The two ends of the cable 42 are provided with an expansion sleeve connection structure, the outer shell of which is inserted into a pre-set sleeve hole on the top surface of the fixed plate 41 and the top of the blade 21, and automatically locked by the expansion sleeve connection structure. Alternatively, the cable 42 can be directly fixed to the top of the fixed plate 41 and the blade 21 via pins, ensuring a firm and reliable connection.

[0063] In one embodiment, the cable 42 includes a first pull rope 421 and a second pull rope 422, and the first pull rope 421 and the second pull rope 422 are connected by a locking device 44.

[0064] Specifically, both the first pull rope 421 and the second pull rope 422 are made of high-strength metal rope. The top end of the first pull rope 421 is connected to the fixed plate 41, and the bottom end of the second pull rope 422 is connected to the top end of the blade 21. The bottom end of the first pull rope 421 and the top end of the second pull rope 422 are detachably connected by a locking device 44. The locking device 44 is located at the middle connection position between the two pull ropes and can adjust and fix the tension of the entire pull rope 42.

[0065] In one embodiment, the locking device 44 includes a locking nut and a locking bolt. The bottom end of the first pull rope 421 and the top end of the second pull rope 422 are respectively provided with locking bolts, and the locking bolts on the first pull rope 421 and the second pull rope 422 are respectively screwed to the two ends of the locking nut.

[0066] Specifically, a locking bolt is welded to the bottom end of the first pull rope 421, and a locking bolt is also welded to the top end of the second pull rope 422. The locking nut is a hollow internal threaded connector, and its two ends are screwed to the locking bolts on the first pull rope 421 and the second pull rope 422, respectively.

[0067] During installation, the screw depth of the two bolts can be adjusted simultaneously by rotating the locking nut, thereby changing the distance between the first pull rope 421 and the second pull rope 422, and realizing the tension adjustment of the entire cable 42. When the cable 42 reaches the required preload, a stable threaded locking state is formed between the locking nut and the locking bolt, ensuring that the cable 42 will not loosen during the operation of the wind turbine.

[0068] In other embodiments, the locking device 44 between the first pull rope 421 and the second pull rope 422 may also be a groove-locking structure.

[0069] Specifically, the bottom end of the first pull rope 421 is provided with a connector with a groove. The groove has an elongated channel opening towards the second pull rope 422, and the channel has multiple evenly distributed locking holes. The top end of the second pull rope 422 is provided with a pin-type lock, whose pin can be inserted into the groove and cooperate with the locking hole at any position. When it is necessary to adjust the tension of the pull rope 42, the pin can be slid along the groove to the appropriate position and then pressed into the corresponding locking hole to complete the tension adjustment. Then, the pin lock is used to prevent slippage and lock the rope.

[0070] According to an embodiment of the present invention, another aspect provides a vertical axis wind turbine generator 7, including a wind turbine blade 21 support structure, and further including: a tower 5, a connecting cylinder 6, a generator 7 and a speed increaser 8. The bottom end of the connecting cylinder 6 is connected to the top end of the tower 5. The connecting cylinder has a cavity. The generator 7 and the speed increaser 8 are disposed in the cavity, and the speed increaser 8 is located above the generator 7. The bottom end of the main shaft 1 is connected to the top end of the speed increaser 8, and the bottom end of the speed increaser 8 is connected to the input end of the generator 7.

[0071] Specifically, the tower 5 supports the entire wind turbine 7. The bottom end of the connecting cylinder 6 has a slot that matches the top end of the tower 5; the top end of the tower 5 is inserted into the slot and fixedly connected to the connecting cylinder 6. The generator 7 and the speed increaser 8 are installed inside the cavity of the connecting cylinder 6, with the speed increaser 8 located above the generator 7 and connected by a coupling. The main shaft 1 extends through the cavity from the upper end of the connecting cylinder 6, and its bottom end is connected to the output shaft of the speed increaser 8 via a coupling. Multiple rotating bearings are arranged axially at the bottom end of the main shaft 1, and the input shaft of the speed increaser 8 is connected to the rotor shaft of the generator 7. Multiple heat dissipation vents are symmetrically arranged circumferentially on the side wall of the connecting cylinder 6, and heat dissipation windows are installed on these vents.

[0072] Working process: When wind is present in the environment, multiple blades 21 evenly arranged around the main axis 1 generate lift under the action of the wind, thereby driving the entire wind turbine blade 21 support structure to rotate. The blades 21 are stably connected by connecting arms 312 on the first support member 31 and the second support member 32, ensuring that the blades 21 have good structural rigidity and dynamic balance performance during rotation.

[0073] The rotating main shaft 1 transmits kinetic energy to the speed increaser 8 inside the connecting cylinder 6. The speed increaser 8 accelerates the low-speed rotational motion input from the main shaft 1 to reach the operating speed required by the generator 7. The output shaft of the speed increaser 8 is connected to the input shaft of the generator 7. The accelerated mechanical energy is transmitted to the generator 7, driving the rotor of the generator 7 to rotate, thereby generating current and realizing the conversion of wind energy into electrical energy.

[0074] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A wind turbine blade support structure, characterised in that, include: Main spindle (1); A blade (21) assembly comprising a plurality of blades (21) spaced circumferentially along the main shaft (1); The support mechanism includes a first support member (31) and a second support member (32) spaced apart along the axial direction of the main shaft (1). The support member includes a turntable (311) and a plurality of connecting arms (312). The turntable (311) is disposed on the main shaft (1). The plurality of connecting arms (312) are spaced apart circumferentially along the turntable (311). The top end of the blade (21) is connected to the end of the connecting arm (312) of the first support member (31) away from the turntable (311). The bottom end of the blade (21) is connected to the end of the connecting arm (312) of the second support member (32) away from the turntable (311).

2. The wind turbine blade support structure according to claim 1, wherein, It also includes a tensioning mechanism, which includes a fixed plate (41) and a plurality of cables (42). The fixed plate (41) is connected to the top end of the main shaft (1). The plurality of cables (42) are arranged at intervals along the circumference of the fixed plate (41). One end of each cable (42) is connected to the fixed plate (41), and the other end is connected to the top end of one of the blades (21).

3. The wind turbine blade support structure according to claim 2, characterized in that, Both ends of the cable (42) are provided with connecting plates (43), and the connecting plates (43) are fixedly connected to the top of the fixed plate (41) and the blade (21).

4. The wind turbine blade support structure according to claim 2, characterized in that, The cable (42) includes a first pull rope (421) and a second pull rope (422), and the first pull rope (421) and the second pull rope (422) are connected by a locking device (44).

5. The wind turbine blade support structure according to claim 4, characterized in that, The locking device (44) includes a locking nut and a locking bolt. The bottom end of the first pull rope (421) and the top end of the second pull rope (422) are respectively provided with locking bolts. The locking bolts on the first pull rope (421) and the second pull rope (422) are respectively screwed to both ends of the locking nut.

6. The wind turbine blade support structure according to claim 1, characterized in that, The connecting arm (312) includes a connecting component (3121) and a fixing component (3122) connected to each other. The fixing component (3122) has multiple through holes. The top and bottom ends of the blade (21) have multiple threaded holes respectively. The connecting bolt (3123) passes through the through holes and is screwed into the threaded holes.

7. The wind turbine blade support structure according to claim 6, characterized in that, The width of the connecting component (3121) gradually decreases from the end near the turntable (311) to the end near the fixing component (3122).

8. The wind turbine blade support structure according to claim 1, characterized in that, The top and bottom surfaces of the support are provided with reinforcing ribs (313).

9. The wind turbine blade support structure according to claim 8, characterized in that, The reinforcing rib (313) includes an annular reinforcing member (3131) and a plate-shaped reinforcing member (3132). The annular reinforcing member (3131) is coaxially arranged with the turntable (311), and a plate-shaped reinforcing member (3132) is provided on the top and bottom surfaces of each connecting arm (312).

10. A vertical axis wind turbine generator, comprising the wind turbine blade (21) support structure as described in any one of claims 1-9, characterized in that, Also includes: The tower (5), connecting cylinder (6), generator (7) and speed increaser (8) are provided. The bottom end of the connecting cylinder (6) is connected to the top end of the tower (5). The connecting cylinder has a cavity. The generator (7) and the speed increaser (8) are located in the cavity, and the speed increaser (8) is located above the generator (7). The bottom end of the main shaft (1) is connected to the top end of the speed increaser (8), and the bottom end of the speed increaser (8) is connected to the input end of the generator (7).

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