Adjustable blade supporting frame of vertical axis wind turbine

Abstract

The invention relates to the technical field of power equipment, in particular to an adjustable blade supporting frame of a vertical axis wind turbine, which comprises a base, a central shaft is rotatably connected to the base through a rotating seat, two groups of fixed discs are fixedly arranged on the outer wall of the central shaft, and a plurality of brackets are mounted on the fixed discs; one end of the support is movably connected with the inner end face of the outer blade through a first hinge block, a centrifugal driving mechanism is fixedly arranged on the outer wall of the center shaft, and a plurality of angle adjusting mechanisms are in transmission engagement with the outer side of the centrifugal driving mechanism. According to the adjustable blade supporting frame of the vertical-axis wind turbine, the problem that a traditional fixed blade is difficult to adapt to variable wind conditions is effectively solved, active speed limiting can be achieved when the rotating speed is too high, damage to equipment caused by power overload can be avoided, it can be guaranteed that an outer blade always operates in a high-efficiency interval, and the service life of the equipment is prolonged. And it can be ensured that the draught fan can continuously and stably operate when the wind speed is low, the applicable wind speed range of equipment is widened, and the utilization rate of wind energy resources is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power equipment, in particular to an adjustable blade support frame of a vertical axis wind turbine. Background Art

[0002] As the global energy mix shifts toward cleaner, low-carbon energy, the development and utilization of wind energy, a plentiful, renewable, clean energy source, has become a crucial component of national energy strategies. Vertical-axis wind turbines, with their advantages of requiring no wind alignment, flexible structural layout, and adaptability to complex wind farm environments, show promising application prospects in small- and medium-sized power generation scenarios and urban wind energy utilization. However, existing vertical-axis wind turbines still face numerous technical bottlenecks in actual operation, hindering their efficiency and stability.

[0003] On the one hand, the blades of traditional vertical-axis wind turbines are mostly designed with a fixed angle, making it difficult to adapt to a wide range of wind speed changes. In low wind speed environments, blades with a fixed angle of attack cannot effectively capture wind energy, resulting in difficulty starting or low power generation efficiency. At high wind speeds, the blade angle of attack cannot be adjusted in time, and excessive wind energy input can easily lead to excessive rotor speed. This may not only cause power overload, but also significantly reduce wind energy utilization efficiency due to blade stall. Although some adjustable blade structures can achieve angle adjustment, they often rely on active control devices driven by external power, which not only increases system complexity and energy consumption, but also increases maintenance costs, limiting their applicability in remote areas or off-grid scenarios.

[0004] On the other hand, the speed control mechanism of existing vertical-axis wind turbines is often independent of the blade adjustment system, requiring additional braking or speed limiting devices, resulting in structural redundancy. When wind speeds surge or wind field fluctuations occur, if speed control is not timely implemented, the rotor can easily overspeed, generating excessive centrifugal force and aerodynamic loads, exacerbating blade fatigue damage and even causing complete machine failure, seriously affecting the equipment's service life and operational safety.

[0005] In addition, under low wind speed conditions such as breezes, the blades of traditional vertical axis wind turbines have limited ability to be driven by wind, and often experience problems such as shutdown after startup or unstable operation, making it difficult to fully utilize low wind speed wind energy resources.

[0006] To address the above problems, there is an urgent need to develop a blade support device that can adapt to wind speed changes, integrate blade angle of attack adjustment and speed control functions, and has a simple and reliable structure, so as to improve the efficiency, stability and durability of vertical-axis wind turbines under different wind conditions and promote their efficient application in various scenarios. Summary of the Invention

[0007] In response to the shortcomings of the existing technology, the present invention provides an adjustable blade support frame for a vertical-axis wind turbine, which solves the technical problems that the blade attack angle of traditional vertical-axis wind turbines cannot automatically adapt to a wide wind speed range without external power, the separation of speed control and blade adjustment leads to structural redundancy, unstable operation in breeze conditions, and susceptibility of outdoor structures to erosion.

[0008] To solve the above-mentioned technical problems, the present invention provides the following technical solutions: an adjustable blade support frame for a vertical axis wind turbine, comprising a base, the base being rotatably connected to a central shaft via a rotating seat, two sets of fixed disks being fixedly provided on the outer wall of the central shaft, a plurality of brackets being mounted on the fixed disks, one end of the bracket being movably connected to the inner end surface of an outer blade via a hinge block, a centrifugal drive mechanism being fixedly provided on the outer wall of the central shaft, the outer side of the centrifugal drive mechanism being engaged with a plurality of angle adjustment mechanisms, the angle adjustment mechanisms being hingedly connected to the inner end surface of the outer blade, and a plurality of speed control mechanisms being fixedly connected to the outer side of the central shaft being provided below the centrifugal drive mechanism; The centrifugal drive mechanism includes a fixed ring fixed on the central shaft, and a plurality of centrifugal cylinders with the same number as the outer blades are fixed on the outer wall of the fixed ring. Centrifugal blocks are movable inside the centrifugal cylinders, and a gear rod is fixed on the centrifugal blocks. The gear rod passes through and extends to the outside of the centrifugal cylinder, and a spring is sleeved on the outer wall of the gear rod inside the centrifugal cylinder.

[0009] Preferably, the angle adjustment mechanism includes a fixed block fixed to the centrifugal barrel, a gear is rotatably connected to the fixed block, the gear is meshed with one side of the gear rod, a gear ring is provided on the outer side of the top of the gear, a plurality of segmented teeth are provided on the inner wall of the gear ring and meshed with the gear, a follower connecting rod is connected to the gear ring, one end of the follower connecting rod is connected to an adjusting rod, one end of the adjusting rod is movably connected to the inner end surface of the outer blade through a hinge block 2, the adjusting rod is rotatably connected to the fixed rod, and the fixed rod is fixed to one side of the centrifugal barrel.

[0010] Preferably, the angle adjustment mechanism further includes a plurality of support rods fixedly connected to the outer wall of the fixed ring, the support rods are of a "T"-shaped structure, and one end of the support rod is slidably disposed in a slide groove provided on the inner wall of the gear ring.

[0011] Preferably, the follower connecting rod consists of a front rod body, a threaded rod, a threaded sleeve and a rear rod body. The front rod body and the rear rod body are both "L"-shaped structures. One end of the front rod body is movably inserted into the gear ring, and one end of the rear rod body is movably inserted into the adjusting rod. The threaded rod is fixedly connected to the front rod body, the threaded sleeve is fixedly connected to the rear rod body, and the threaded sleeve is threadedly connected to the threaded rod.

[0012] Preferably, the speed reduction mechanism includes a connecting block fixed to the outer wall of the centrifugal block, the connecting block moves in a sliding hole opened on the outer wall of the centrifugal cylinder, a slider 1 is fixed to the bottom of the connecting block, the slider 1 is slidably set in a through hole 1 opened on the top of the swing arm, the swing arm is rotatably connected to the inner side of the fixed frame through a pin shaft, the fixed frame is fixed to the outer wall of the central axis, a through hole 2 is opened at the bottom of the swing arm, a slider 2 is slidably set in the through hole 2, the slider 2 is fixed to one end of the push rod, and a friction block is fixed on the other end of the push rod, the friction block is located on the outside of the friction ring, and the friction ring is fixed to the outer wall of the base.

[0013] Preferably, a guide block is fixedly provided on the outer wall of the push rod, and the guide block is slidably arranged in a guide hole opened at the bottom of the fixing frame.

[0014] Preferably, a baffle fixed to the central shaft is provided above the centrifugal drive mechanism.

[0015] Preferably, a plurality of inner blades fixed to the central axis are provided between the two groups of fixed disks, and the inner blades are in a spiral structure with an arc.

[0016] By means of the above technical solution, the present invention provides an adjustable blade support frame for a vertical axis wind turbine, which has at least the following beneficial effects: 1. The vertical-axis wind turbine's adjustable blade support frame, through a linked design of a centrifugal drive mechanism and an angle adjustment mechanism, enables fully automatic adjustment of the outer blade angle of attack without the need for external power. In low wind speeds, the outer blade angle of attack is actively increased to enhance wind energy capture, ensuring smooth turbine startup and efficient power generation. At high wind speeds, the angle of attack is automatically reduced to prevent the blades from stalling due to excessive wind energy input. This maintains high wind energy utilization efficiency across a wide wind speed range, effectively addressing the difficulty of traditional fixed blades in adapting to variable wind conditions.

[0017] 2. The vertical-axis wind turbine's adjustable blade support innovatively integrates outer blade angle adjustment and speed control functions through a centrifugal drive mechanism. When the outer blades rotate too fast, centrifugal force drives the friction blocks and friction rings of the speed-reduction mechanism into contact, achieving active speed limiting when the speed is too fast. This not only prevents damage to the equipment due to power overload, but also ensures that the outer blades always operate within the high-efficiency range. This simplifies the structure of traditional independent speed control systems and improves operational reliability.

[0018] 3. The vertical-axis wind turbine's adjustable blade support directly links the outer blade angle of attack and friction block resistance to the central shaft speed. Higher speeds increase the distance the centrifugal blocks move, and the angle of attack decreases and resistance increases simultaneously, creating a dynamic, coordinated adjustment mechanism. This design eliminates the need for complex sensors and control units, achieving adaptive response to changing wind conditions solely through the physical properties of the mechanical structure. This not only reduces system energy consumption and the risk of failure, but also allows for rapid adaptation to wind speed fluctuations, ensuring stable power generation efficiency.

[0019] 4. The vertical-axis wind turbine's adjustable blade support features a baffle plate positioned above the centrifugal drive mechanism, effectively preventing rain, dust, and other impurities from eroding the underlying core structural components, mitigating environmental issues such as component corrosion and seizure. This design extends the unit's maintenance cycle and service life, making it particularly suitable for use in complex outdoor climates, such as rainy mountainous areas and coastal regions, and enhancing the turbine's durability in harsh operating conditions.

[0020] 5. The vertical-axis wind turbine's adjustable blade support features spiral inner blades attached to the central axis, which work in synergy with the outer blades, significantly enhancing the turbine's ability to capture wind energy in light winds. The inner blades' spiral structure more efficiently utilizes the thrust of low-speed airflow. Combined with the outer blades' optimal angle of attack, this ensures continuous and stable operation even at low wind speeds, broadening the turbine's applicable wind speed range and improving wind energy utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application: Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention from the first overall perspective; Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention from the second overall perspective; Figure 3 It is a schematic structural diagram of the present invention from a top view; Figure 4 It is a schematic diagram of the structure of the present invention when viewed from above; Figure 5 This is a schematic diagram of the structure of the central shaft connected to a single outer blade of the present invention; Figure 6 It is a schematic structural diagram of a single centrifugal cylinder and its cross-section on the centrifugal drive mechanism of the present invention; Figure 7 This is a structural diagram of the connection between the centrifugal drive mechanism and the angle adjustment mechanism of the present invention; Figure 8 This is a schematic structural diagram of the connection between the centrifugal drive mechanism and the speed suppression mechanism of the present invention; Figure 9Schematic diagram of the structure of the swing arm of the present invention; Figure 10 It is a structural schematic diagram of the follower connecting rod of the present invention.

[0022] Reference numerals: 1. Base; 101. Friction ring; 2. Rotating seat; 3. Central axis; 4. Fixed plate; 5. Bracket; 6. Hinge block 1; 7. Outer blades; 8. Centrifugal drive mechanism; 801. Fixed ring; 802. Centrifugal cylinder; 8021. Slide hole; 803. Centrifugal block; 804. Gear rod; 805. Spring; 9. Angle adjustment mechanism; 901. Fixed block; 902. Gear; 903. Gear ring; 904. Gear; 905. Support rod; 906. Follower connecting rod; 9061, front rod body; 9062, threaded rod; 9063, threaded sleeve; 9064, rear rod body; 907, adjusting rod; 908, fixing rod; 909, hinge block 2; 10, speed control mechanism; 1001, connecting block; 1002, slider 1; 1003, swing arm; 1004, pin; 1005, fixing bracket; 1006, slider 2; 1007, push rod; 1008, friction block; 1009, guide block; 11, inner blade; 12, baffle. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] A vertical-axis wind turbine is a wind energy-harvesting device whose rotor rotates around an axis perpendicular to the ground, converting wind energy into mechanical energy and then further into electrical energy. Compared to horizontal-axis wind turbines, the core difference lies in the direction of the rotation axis. Its structural features include: the rotor rotates around a vertical axis, eliminating the need for complex wind-control devices such as rudders or yaw systems, as is required for horizontal-axis wind turbines, allowing it to adapt to any wind direction. The blades are distributed circumferentially along the vertical axis, with common shapes including arcs, straight blades, or spirals. Based on their operating principle, they can be categorized as lift-generating, drag-generating, or hybrid types. The generator and transmission components can be installed close to the ground, reducing the difficulty of high-altitude installation and maintenance.

[0025] Based on the technical defects of the existing technology, such as the blade angle of attack cannot automatically adapt to a wide wind speed range without external power, the separation of speed control and blade adjustment leads to structural redundancy, unstable operation in breeze conditions and easy erosion of outdoor structures, please refer to Figures 1-10The adjustable blade support frame of the vertical axis wind turbine provided in this embodiment maintains a high wind energy utilization efficiency in a wide wind speed range, effectively solving the pain point that traditional fixed blades are difficult to adapt to changeable wind conditions, and can achieve active speed limit when the rotation speed is too fast, which can not only avoid power overload from causing damage to the equipment, but also ensure that the outer blades 7 always operate in the high-efficiency range, and can also operate stably in breeze weather, broadening the applicable wind speed range of the equipment and improving the utilization rate of wind energy resources. The structure includes a base 1, which is made of high-strength cast iron material to ensure the stability of the overall structure. The base 1 is rotatably connected to a central shaft 3 through a rotating seat 2. A high-precision bearing is installed in the rotating seat 2 to reduce the friction resistance of the central shaft 3 when it rotates. Two groups of fixed disks 4 are fixed on the outer wall, and the fixed disks 4 are fixedly connected to the central axis 3 by bolts. The distance between the two groups of fixed disks 4 is 30-50 cm. A plurality of brackets 5 are installed on the fixed disk 4, and the brackets 5 are evenly distributed along the circumferential direction of the fixed disk 4. The angles between two adjacent brackets 5 are equal. One end of the bracket 5 is movably connected to the inner end face of the outer blade 7 through a hinge block 6. A wear-resistant bushing is provided in the hinge block 6 to improve the rotation flexibility of the outer blade 7. A centrifugal drive mechanism 8 is fixed on the outer wall of the central axis 3. The outer side transmission engagement of the centrifugal drive mechanism 8 has multiple groups of angle adjustment mechanisms 9. The angle adjustment mechanism 9 is hinged to the inner end face of the outer blade 7. A plurality of speed suppression mechanisms 10 fixed to the outer side of the central axis 3 are provided below the centrifugal drive mechanism 8.

[0026] Existing blade angle adjustment relies on external power or complex sensor control, which is costly, has a high failure rate, and is difficult to respond to wind speed in real time. For this problem, please refer to Figure 6 The centrifugal drive mechanism 8 includes a fixed ring 801 fixed to the central shaft 3, and a plurality of centrifugal cylinders 802 having the same number as the outer blades 7 are fixed on the outer wall of the fixed ring 801. Centrifugal blocks 803 are movable inside the centrifugal cylinder 802. The centrifugal blocks 803 are made of high-density alloy material and can generate sufficient centrifugal force. A gear rod 804 is fixed to the centrifugal block 803. The gear rod 804 passes through and extends to the outside of the centrifugal cylinder 802. A guide sleeve is provided at the contact portion between the gear rod 804 and the centrifugal cylinder 802. The gear rod 804 is located at the centrifugal cylinder 802. A spring 805 is sleeved on the outer wall of the core cylinder 802, one end of the spring 805 is in contact with the centrifugal block 803, and the other end is in contact with the inner wall of the centrifugal cylinder 802; the centrifugal drive mechanism 8 utilizes the cooperation of the centrifugal block 803, the gear rod 804 and the spring 805, and can drive and adjust only by the centrifugal force generated by the rotation speed of the central shaft 3, without the need for external power, reducing energy consumption and cost; the spring 805 can realize the automatic reset of the centrifugal block 803, ensuring that the angle of attack of the outer blade 7 returns to a reasonable state at low wind speeds, with sensitive response and simple structure.

[0027] The problem of adjusting the angle of attack of the outer blade 7 in the prior art is the same as that described above. For this problem, please refer to Figure 7The angle adjustment mechanism 9 includes a fixed block 901 fixed to the centrifugal cylinder 802, and a gear 902 is rotatably connected to the fixed block 901. The gear 902 meshes with one side of the gear rod 804. A gear ring 903 is provided on the outer side of the top of the gear 902. A plurality of segmented teeth 904 are provided on the inner wall of the gear ring 903 and mesh with the gear 902. A follower connecting rod 906 is connected to the gear ring 903, and one end of the follower connecting rod 906 is connected to an adjusting rod 907. One end of the adjusting rod 907 is movably connected to the inner end surface of the outer blade 7 through a hinge block 2 909. The adjusting rod 907 is rotatably connected to the fixed rod 908, and the fixed rod 908 is fixed It is connected to one side of the centrifugal cylinder 802; through the meshing transmission of the gear 902, the gear rod 804 and the gear ring 903, efficient force transmission is achieved and the adjustment accuracy is high; the adjustment rod 907 is supported by the fixed rod 908 to ensure stability during rotation and reduce the error of the angle of attack adjustment; the specific adjustment process is: under the action of centrifugal force, the centrifugal block 803 overcomes the elastic force of the spring 805 and drives the gear rod 804 to move, the gear rod 804 drives the gear ring 903 to rotate through the gear 902, the gear ring 903 pulls / pushes the adjustment rod 907 through the follower connecting rod 906, and the adjustment rod 907 drives the outer blade 7 to rotate, so as to achieve the purpose of adjusting the angle of attack of the outer blade 7.

[0028] Furthermore, the gear 902, the gear ring 903 and the follower link 906 in the above structure are designed to ensure that the angle of attack of each outer blade 7 is adjusted synchronously to improve the stability of the overall structure in operation.

[0029] For further information, please refer to Figure 7 The angle adjustment mechanism 9 also includes a plurality of support rods 905 fixed to the outer wall of the fixed ring 801. The support rods 905 are T-shaped structures, and one end of the support rods 905 is slidably set in a slide groove opened on the inner wall of the gear ring 903; the support rods 905 provide movement support for the gear ring 903 so that it can remain stable.

[0030] The traditional connecting rod has a fixed length and cannot be adjusted according to different fan models or blade sizes, resulting in poor adaptability. In addition, the connection between the connecting rod, blades, and gear ring 903 is prone to adjustment jams due to assembly errors. For this problem, please refer to Figure 10The follower connecting rod 906 is composed of a front rod body 9061, a threaded rod 9062, a threaded sleeve 9063 and a rear rod body 9064. The front rod body 9061 and the rear rod body 9064 are both "L"-shaped structures. One end of the front rod body 9061 is movably plugged into the gear ring 903, and one end of the rear rod body 9064 is movably plugged into the adjusting rod 907. The threaded rod 9062 is fixedly connected to the front rod body 9061, the threaded sleeve 9063 is fixedly connected to the rear rod body 9064, and the threaded sleeve 9063 is threadedly connected to the threaded rod 9062; through the cooperation of the threaded rod 9062 and the threaded sleeve 9063, the overall length of the follower connecting rod 906 can be flexibly adjusted to adapt to different outer blade 7 sizes or initial attack angle requirements, and it has strong versatility; the front rod body 9061 and the rear rod body 9064 adopt a movably plug-in method to reduce the influence of assembly error on adjustment and ensure smooth transmission.

[0031] Existing speed control is mostly an independent braking system, which is not linked to blade adjustment and has a delayed response. The movement trajectory of the braking component is unstable, resulting in uneven braking effect and easily causing equipment overload. For this problem, please refer to Figure 8 The speed control mechanism 10 includes a connecting block 1001 fixed to the outer wall of the centrifugal block 803, the connecting block 1001 moves in a sliding hole 8021 opened on the outer wall of the centrifugal cylinder 802, a slider 1002 is fixed at the bottom of the connecting block 1001, and the slider 1002 is slidably set in a through hole 1 opened at the top of the swing arm 1003. The swing arm 1003 is rotatably connected to the inner side of the fixing frame 1005 through the pin 1004, and the fixing frame 1005 is fixed. Connected to the outer wall of the central shaft 3, the bottom of the swing arm 1003 is provided with a through hole 2, and a slider 2 1006 is slidably provided in the through hole 2. The slider 2 1006 is fixed to one end of the push rod 1007, and a friction block 1008 is fixed to the other end of the push rod 1007. The friction block 1008 is located on the outside of the friction ring 101, and the friction ring 101 is fixed to the outer wall of the base 1. The friction block 1008 and the friction ring 101 are made of high wear-resistant materials; The speed reduction mechanism 10 is linked with the centrifugal drive mechanism 8. When the speed is too high, the friction block 1008 is directly driven to contact the friction ring 101 through the centrifugal force, and the response is rapid; the cooperation of the swing arm 1003, the slider and the push rod 1007 ensures that the movement trajectory of the friction block 1008 is stable, the braking effect is uniform, and power overload is effectively avoided. The specific movement process is: under the action of centrifugal force, the centrifugal block 803 overcomes the elastic force of the spring 805 and drives the connecting block 1001 to move. The connecting block 1001 drives the push rod 1007 to move under the action of the slider 1002, the swing arm 1003 and the slider 2 1006. The push rod 1007 drives the friction block 1008 to approach the friction ring 101. Since the speed reduction mechanism 10 rotates with the central shaft 3, and the friction ring 101 is fixed on the base 1 and remains motionless, the friction block 1008 can provide rotational resistance after contacting the friction ring 101, so as to avoid the problem of excessive speed of the outer blade 7.

[0032] Furthermore, a guide block 1009 is fixedly provided on the outer wall of the push rod 1007, and the guide block 1009 is slidably set in a guide hole opened at the bottom of the fixed frame 1005; the guide block 1009 cooperates with the guide hole of the fixed frame 1005 to limit the push rod 1007 to move only in the axial direction, ensuring that the friction block 1008 and the friction ring 101 fit tightly and are evenly stressed, thereby improving braking reliability and reducing component wear.

[0033] The above-mentioned core components such as the centrifugal drive mechanism 8 and the gear 902 are exposed to the outdoors and are easily corroded by rainwater, resulting in rust and jamming, reducing system reliability and increasing maintenance costs. To address this problem, a baffle 12 fixed to the central shaft 3 is provided above the centrifugal drive mechanism 8. The baffle 12 is made of stainless steel. The baffle 12 can effectively prevent impurities such as rainwater from entering the core mechanism below, reduce damage to components caused by environmental erosion, extend the maintenance cycle, and improve the durability of the device in complex climate environments.

[0034] In a traditional vertical axis fan, the outer blades 7 are not subjected to sufficient force under breeze conditions, making it difficult to start or operate continuously, and the wind energy utilization rate is low. To address this problem, a plurality of inner blades 11 fixed to the central axis 3 are provided between the two sets of fixed disks 4. The inner blades 11 have a spiral structure with an arc; the spiral inner blades 11 can efficiently capture the thrust of the breeze airflow, and work in conjunction with the outer blades 7 to enhance the driving force under low wind speeds, ensuring that the fan can operate stably under breeze conditions, broadening the applicable wind speed range, and improving wind energy utilization.

[0035] The working principle of this embodiment is as follows: When the wind speed is low, the outer blades 7 and the inner blades 11 drive the central shaft 3 to rotate under the action of the wind. At this time, the rotation speed of the central shaft 3 is low, and the centrifugal force generated by the centrifugal block 803 is small. Under the elastic force of the spring 805, the centrifugal block 803 and the gear rod 804 do not move, the gear 902 and the gear ring 903 remain stationary, and the outer blades 7 are in a state with a large angle of attack, which can effectively capture wind energy.

[0036] When the wind speed increases, the rotation speed of the central shaft 3 increases, and the centrifugal force generated by the centrifugal block 803 increases. When the centrifugal force is greater than the elastic force of the spring 805, the centrifugal block 803 moves and compresses the spring 805, driving the gear rod 804 to move synchronously. The gear rod 804 engages with the gear 902, driving the gear 902 to rotate. The gear 902 engages with the gear ring 903, driving the gear ring 903 to rotate. The gear ring 903 drives the adjusting rod 907 to rotate through the follower connecting rod 906. The adjusting rod 907 drives the outer blade 7 to rotate around the hinge block 1 6 through the hinge block 2 909, so that the angle of attack of the outer blade 7 is reduced, which can avoid the stall problem caused by excessive wind energy input.

[0037] At the same time, when the rotation speed of the central shaft 3 is too high, the centrifugal block 803 drives the slider 1002 to slide in the through hole 1 of the swing arm 1003 through the connecting block 101, so that the swing arm 1003 rotates around the pin 1004. The swing arm 1003 drives the push rod 1007 to move inward through the slider 2 1006, so that the friction block 1008 contacts the friction ring 1009 and generates friction, thereby increasing the resistance to the rotation of the central shaft 3, thereby limiting the rotation speed of the central shaft 3 and avoiding power overload.

[0038] When the wind speed decreases, the centrifugal block 803 moves inward under the elastic force of the spring 805, the various mechanisms are reset, the angle of attack of the outer blade 7 increases, the friction block 1008 separates from the friction ring 1009, and the central shaft 3 can operate efficiently at lower wind speeds.

[0039] It should be noted that the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements that are inherent to such process, method, article or apparatus.

[0040] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An adjustable blade support frame for a vertical axis wind turbine, comprising a base (1), a central shaft (3) rotatably connected to the base (1) via a rotating seat (2), two sets of fixed disks (4) fixedly provided on the outer wall of the central shaft (3), a plurality of brackets (5) mounted on the fixed disks (4), one end of the bracket (5) being movably connected to the inner end surface of an outer blade (7) via a hinge block (6), and characterized in that: A centrifugal drive mechanism (8) is fixedly provided on the outer wall of the central shaft (3); the outer side of the centrifugal drive mechanism (8) is engaged with a plurality of angle adjustment mechanisms (9); the angle adjustment mechanisms (9) are hingedly connected to the inner end faces of the outer blades (7); and a plurality of speed control mechanisms (10) fixedly connected to the outer side of the central shaft (3) are provided below the centrifugal drive mechanism (8); The centrifugal drive mechanism (8) comprises a fixed ring (801) fixedly connected to the central shaft (3); a plurality of centrifugal cylinders (802) having the same number as the outer blades (7) are fixedly provided on the outer wall of the fixed ring (801); a centrifugal block (803) is movable inside the centrifugal cylinder (802); a gear rod (804) is fixedly connected to the centrifugal block (803); the gear rod (804) passes through and extends to the outside of the centrifugal cylinder (802); and a spring (805) is sleeved on the outer wall of the gear rod (804) located inside the centrifugal cylinder (802).

2. The adjustable blade support frame of the vertical axis wind turbine according to claim 1, characterized in that: The angle adjustment mechanism (9) includes a fixed block (901) fixed to the centrifugal cylinder (802), a gear (902) rotatably connected to the fixed block (901), the gear (902) meshing with one side of a gear rod (804), a gear ring (903) provided on the outer side of the top of the gear (902), a plurality of segmented teeth (904) provided on the inner wall of the gear ring (903) meshing with the gear (902), a follower connecting rod (906) connected to one end of the follower connecting rod (906) connected to an adjusting rod (907), one end of the adjusting rod (907) movably connected to the inner end surface of the outer blade (7) via a hinge block 2 (909), the adjusting rod (907) rotatably connected to a fixed rod (908), and the fixed rod (908) fixed to one side of the centrifugal cylinder (802).

3. The adjustable blade support frame of the vertical axis wind turbine according to claim 2, characterized in that: The angle adjustment mechanism (9) further comprises a plurality of support rods (905) fixedly connected to the outer wall of the fixing ring (801), wherein the support rods (905) are T-shaped structures, and one end of the support rods (905) is slidably arranged in a sliding groove provided on the inner wall of the gear ring (903).

4. The adjustable blade support frame of the vertical axis wind turbine according to claim 2, characterized in that: The follower connecting rod (906) is composed of a front rod body (9061), a threaded rod (9062), a threaded sleeve (9063) and a rear rod body (9064). The front rod body (9061) and the rear rod body (9064) are both "L"-shaped structures. One end of the front rod body (9061) is movably connected to the gear ring (903), and one end of the rear rod body (9064) is movably connected to the adjustment rod (907). The threaded rod (9062) is fixedly connected to the front rod body (9061), the threaded sleeve (9063) is fixedly connected to the rear rod body (9064), and the threaded sleeve (9063) is threadedly connected to the threaded rod (9062).

5. The adjustable blade support frame of the vertical axis wind turbine according to claim 1, characterized in that: The speed control mechanism (10) includes a connecting block (1001) fixedly connected to the outer wall of the centrifugal block (803), the connecting block (1001) moves in a sliding hole (8021) opened on the outer wall of the centrifugal cylinder (802), a slider (1002) is fixedly provided at the bottom of the connecting block (1001), the slider (1002) is slidably arranged in a through hole (1) opened at the top of the swing arm (1003), and the swing arm (1003) is rotatably connected to the fixed frame (1003) through a pin (1004). 5), a fixing frame (1005) is fixedly connected to the outer wall of the central shaft (3), a through hole 2 is opened at the bottom of the swing arm (1003), a slider 2 (1006) is slidably arranged in the through hole 2, the slider 2 (1006) is fixedly connected to one end of the push rod (1007), a friction block (1008) is fixedly provided on the other end of the push rod (1007), the friction block (1008) is located on the outside of the friction ring (101), and the friction ring (101) is fixedly connected to the outer wall of the base (1).

6. The adjustable blade support frame of the vertical axis wind turbine according to claim 5, characterized in that: A guide block (1009) is fixedly provided on the outer wall of the push rod (1007), and the guide block (1009) is slidably arranged in a guide hole opened at the bottom of the fixing frame (1005).

7. The adjustable blade support frame of the vertical axis wind turbine according to claim 1, characterized in that: A baffle (12) fixedly connected to the central shaft (3) is provided above the centrifugal drive mechanism (8).

8. The adjustable blade support frame of the vertical axis wind turbine according to claim 1, characterized in that: A plurality of inner blades (11) fixedly connected to the central shaft (3) are provided between the two groups of fixed disks (4), and the inner blades (11) are in a spiral structure with an arc.

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