Adjustable blade support for vertical axis wind turbine

Abstract

The present application relates to the technical field of power equipment, and especially relates to an adjustable blade support frame of a vertical axis wind driven generator, which comprises a base, a central shaft rotatably connected to the base through a rotating seat, two groups of fixed discs fixed on the outer wall of the central shaft, a plurality of supports installed on the fixed discs, and an outer end surface of an outer blade movably connected to one end of the support through a hinge block one, a centrifugal driving mechanism fixed on the outer wall of the central shaft, and a plurality of angle adjusting mechanisms meshed with the outer side of the centrifugal driving mechanism; the adjustable blade support frame of the vertical axis wind driven generator effectively solves the pain point that the traditional fixed blade is difficult to adapt to variable wind conditions, and can actively limit the speed when the speed is too fast, so as to avoid damage to the equipment caused by power overload, ensure that the outer blade always operates in the efficient range, ensure that the fan can also continuously and stably operate when the wind speed is low, widen the applicable wind speed range of the equipment, and improve the utilization rate of wind energy resources.

Description

Technical Field

[0001] This invention relates to the field of power equipment technology, specifically to an adjustable blade support frame for a vertical axis wind turbine. Background Technology

[0002] Vertical axis wind turbines, with their advantages of not requiring wind contact, flexible structural layout, and suitability for complex wind farm environments, have shown promising application prospects in small and medium-sized power generation scenarios and urban wind energy utilization. However, existing vertical axis wind turbines still face many technical bottlenecks in actual operation, which restrict their efficiency improvement and stability optimization.

[0003] On the one hand, traditional vertical axis wind turbine blades mostly use a fixed angle design, making it difficult to adapt to a wide range of wind speed variations. In low wind speed environments, blades with a fixed angle of attack cannot effectively capture wind energy, leading to starting difficulties or low power generation efficiency. At high wind speeds, the blade angle of attack cannot be adjusted in time, easily causing excessive wind energy input and excessive rotor speed. This can not only cause power overload but also significantly reduce wind energy utilization efficiency due to blade stall. While some adjustable blade structures can achieve angle adjustment, they mostly rely on externally powered active control devices, which not only increases system complexity and energy consumption but also raises 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 speed increases suddenly or the wind field fluctuates, if speed control is not timely, the wind turbine is prone to generating excessive centrifugal force and aerodynamic load due to overspeed operation, which can aggravate blade fatigue damage and even cause the entire machine to fail, seriously affecting the service life and operational safety of the equipment.

[0005] In addition, under low wind speed conditions such as light winds, the blades of traditional vertical axis wind turbines have limited wind-driven capabilities, often resulting in shutdowns or unstable operation after startup, making it difficult to fully utilize low wind speed wind energy resources.

[0006] To address the aforementioned issues, there is an urgent need to develop a blade support device that can adapt to changes in wind speed, integrate blade angle of attack adjustment and speed control functions, and has a simple and reliable structure. This would 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] To address the shortcomings of existing technologies, this invention provides an adjustable blade support frame for vertical axis wind turbines, which solves the technical problems of traditional vertical axis wind turbines, such as the inability of blade angle of attack to automatically adapt to a wide wind speed range without external power, the separation of speed control and blade adjustment leading to structural redundancy, unstable operation in light wind conditions, and susceptibility of outdoor structures to corrosion.

[0008] To solve the above-mentioned technical problems, the present invention provides the following technical solution: an adjustable blade support frame for a vertical axis wind turbine, including a base, a central shaft rotatably connected to the base via a rotating seat, two sets of fixed disks fixed on the outer wall of the central shaft, multiple brackets mounted on the fixed disks, one end of each bracket being movably connected to the inner end face of an outer blade via a hinge block, a centrifugal drive mechanism fixed on the outer wall of the central shaft, multiple sets of angle adjustment mechanisms engaging with the outer side of the centrifugal drive mechanism, the angle adjustment mechanism being hinged to the inner end face of the outer blade, and multiple sets of speed suppression mechanisms fixed to the outer side of the central shaft below the centrifugal drive mechanism;

[0009] The centrifugal drive mechanism includes a fixed ring fixed to the central shaft. Multiple centrifugal cylinders, the same number as the outer blades, are fixed on the outer wall of the fixed ring. Centrifugal blocks move inside the centrifugal cylinders. A toothed rod is fixed on the centrifugal block. The toothed rod passes through and extends to the outside of the centrifugal cylinder. A spring is sleeved on the outer wall of the toothed rod inside the centrifugal cylinder.

[0010] Preferably, the angle adjustment mechanism includes a fixed block fixed to the centrifuge cylinder, a gear rotatably connected to the fixed block, the gear meshing with one side of the gear rack, a gear ring on the outer side of the top of the gear, a plurality of segmented teeth on the inner wall of the gear ring meshing with the gear, a follower connecting rod connected to the gear ring, an adjusting rod connected to one end of the follower connecting rod, one end of the adjusting rod being movably connected to the inner end face of the outer blade through a hinge block two, the adjusting rod being rotatably connected to the fixed rod, and the fixed rod being fixed to one side of the centrifuge cylinder.

[0011] Preferably, the angle adjustment mechanism further includes a plurality of support rods fixed to the outer wall of the fixed ring. The support rods are T-shaped, and one end of the support rod is slidably disposed in a groove opened on the inner wall of the toothed ring.

[0012] Preferably, the follower linkage consists of a front rod body, a threaded rod, a threaded sleeve, and a rear rod body. Both the front rod body and the rear rod body are "L" shaped structures. One end of the front rod body is movably inserted into the toothed ring, and one end of the rear rod body is movably inserted into the adjusting rod. The threaded rod is fixed to the front rod body, the threaded sleeve is fixed to the rear rod body, and the threaded sleeve is threadedly connected to the threaded rod.

[0013] Preferably, the speed suppression mechanism includes a connecting block fixed to the outer wall of the centrifuge cylinder. The connecting block moves within a sliding hole on the outer wall of the centrifuge cylinder. A slider is fixed to the bottom of the connecting block. The slider is slidably disposed within a through hole at the top of the swing arm. The swing arm is rotatably connected to the inner side of the fixed frame via a pin. The fixed frame is fixed to the outer wall of the central shaft. A through hole is provided at the bottom of the swing arm. A slider is slidably disposed within the through hole. The slider is fixed to one end of the push rod. A friction block is fixed to the other end of the push rod. The friction block is located outside the friction ring. The friction ring is fixed to the outer wall of the base.

[0014] Preferably, a guide block is fixed on the outer wall of the push rod, and the guide block is slidably disposed in a guide hole opened at the bottom of the fixed frame.

[0015] Preferably, a baffle fixed to the central shaft is provided above the centrifugal drive mechanism.

[0016] Preferably, a plurality of inner blades fixed to the central shaft are provided between the two sets of fixed disks, and the inner blades have an arc-shaped spiral structure.

[0017] By employing 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:

[0018] The adjustable blade support frame of this vertical axis wind turbine achieves fully automatic adjustment of the outer blade angle of attack without external power through the linkage design of the centrifugal drive mechanism and the angle adjustment mechanism. In low wind speed environments, it can actively increase the outer blade angle of attack to enhance wind energy capture capability, ensuring smooth start-up and efficient power generation of the wind turbine; while in high wind speeds, it can automatically reduce the angle of attack to prevent the blades from entering a stall state due to excessive wind energy input. Thus, it maintains high wind energy utilization efficiency over a wide wind speed range, effectively solving the pain point of traditional fixed blades being unable to adapt to changing wind conditions.

[0019] The adjustable blade support frame of this vertical axis wind turbine innovatively integrates the outer blade angle of attack adjustment and speed control functions through a centrifugal drive mechanism. When the outer blade speed is too fast, the centrifugal force will drive the friction block of the speed suppression mechanism to contact the friction ring, thus achieving active speed limiting when the speed is too fast. This can not only avoid power overload damage to the equipment, but also ensure that the outer blade always operates in the high-efficiency range. It simplifies the structure of the traditional independent speed control system and improves the reliability of operation.

[0020] The adjustable blade support frame of this vertical axis wind turbine directly correlates the adjustment of the outer blade angle of attack and friction block drag with the central shaft rotation speed. Higher rotation speeds result in greater centrifugal block movement, and the decrease in angle of attack and increase in drag occur simultaneously, forming a dynamic and coordinated adjustment mechanism. This design eliminates the need for complex sensors and control units; it achieves adaptive response to wind condition changes solely through the physical characteristics of the mechanical structure. This not only reduces system energy consumption and failure risks but also allows for rapid adaptation to wind speed fluctuations, ensuring stable power generation efficiency.

[0021] The adjustable blade support frame of this vertical axis wind turbine features a baffle plate above the centrifugal drive mechanism, effectively preventing rainwater, dust, and other impurities from corroding the core structural components below, reducing problems such as component corrosion and jamming caused by environmental factors. This design extends the maintenance cycle and service life of the device, making it particularly suitable for complex outdoor climate environments, such as rainy mountainous areas and coastal regions, thus improving the operational durability of the vertical axis wind turbine under harsh conditions.

[0022] The adjustable blade support frame of this vertical axis wind turbine, by adding helical inner blades on the central axis, forms a cooperative working mode with the outer blades, significantly enhancing the wind turbine's ability to capture wind energy in light wind conditions. The helical structure of the inner blades can more efficiently utilize the thrust of low-speed airflow, and together with the appropriate angle of attack of the outer blades, ensures that the wind turbine can continue to operate stably even at low wind speeds, broadening the applicable wind speed range of the equipment and improving the utilization rate of wind energy resources. Attached Figure Description

[0023] The accompanying drawings, which are provided to further illustrate the invention, constitute a part of this application:

[0024] Figure 1 This is a three-dimensional structural schematic diagram of the invention from an overall perspective.

[0025] Figure 2 This is a three-dimensional structural schematic diagram of the invention from a second overall perspective;

[0026] Figure 3 This is a top view of the structure of the present invention;

[0027] Figure 4 This is a schematic diagram of the structure of the present invention viewed from below;

[0028] Figure 5 This is a schematic diagram of the structure connecting the central shaft and a single outer blade of the present invention;

[0029] Figure 6 This is a schematic diagram of a single centrifuge cylinder and its cross-section on the centrifugal drive mechanism of the present invention;

[0030] Figure 7 This is a schematic diagram of the connection between the centrifugal drive mechanism and the angle adjustment mechanism of the present invention;

[0031] Figure 8 This is a schematic diagram of the connection between the centrifugal drive mechanism and the speed suppression mechanism of the present invention;

[0032] Figure 9 This is a schematic diagram of the swing arm structure of the present invention;

[0033] Figure 10 This is a schematic diagram of the follower linkage of the present invention.

[0034] Figure label:

[0035] 1. Base; 101. Friction ring; 2. Rotating seat; 3. Central shaft; 4. Fixed plate; 5. Bracket; 6. Hinge block one; 7. Outer blade; 8. Centrifugal drive mechanism; 801. Fixed ring; 802. Centrifuge cylinder; 8021. Sliding hole; 803. Centrifuge block; 804. Gear rack; 805. Spring; 9. Angle adjustment mechanism; 901. Fixed block; 902. Gear; 903. Gear ring; 904. Tooth; 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. Fixed rod; 909. Hinge block two; 10. Speed ​​suppression mechanism; 1001. Connecting block; 1002. Slider one; 1003. Swing arm; 1004. Pin; 1005. Fixed frame; 1006. Slider two; 1007. Push rod; 1008. Friction block; 1009. Guide block; 11. Inner blade; 12. Baffle plate. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] A vertical axis wind turbine is a wind energy utilization 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 a horizontal axis wind turbine, its 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-following devices like tail rudders or yaw systems found in horizontal axis turbines, allowing it to adapt to changes in wind direction; the blades are distributed circumferentially along the vertical axis, with common shapes including curved, straight, or spiral blades, and can be categorized as lift-type, drag-type, or hybrid based on their working principle; and the generator and transmission components can be installed close to the ground, reducing the difficulty of high-altitude installation and maintenance.

[0038] Due to the limitations of existing technologies, such as the inability of blade angle of attack to automatically adapt to a wide wind speed range without external power, structural redundancy resulting from the separation of speed control and blade adjustment, instability in low-wind conditions, and susceptibility of outdoor structures to corrosion, please refer to [the relevant documentation / reference]. Figures 1-10The adjustable blade support frame for the vertical axis wind turbine provided in this embodiment maintains high wind energy utilization efficiency over a wide wind speed range, effectively solving the problem that traditional fixed blades are difficult to adapt to changing wind conditions. It can also actively limit speed when the rotation speed is too high, preventing power overload damage to the equipment and ensuring that the outer blades 7 always operate within the high-efficiency range. It can also operate stably in light winds, broadening the applicable wind speed range of the equipment and improving the utilization rate of wind energy resources. The structure includes a base 1 made of high-strength cast iron to ensure the stability of the overall structure. A central shaft 3 is rotatably connected to the base 1 via a rotating seat 2. A high-precision bearing is installed inside the rotating seat 2 to reduce the frictional resistance when the central shaft 3 rotates. Two sets of fixed discs 4 are fixed on the outer wall. The fixed discs 4 are fixedly connected to the central shaft 3 by bolts. The distance between the two sets of fixed discs 4 is 30-50cm. Multiple brackets 5 are installed on the fixed discs 4. The brackets 5 are evenly distributed along the circumference of the fixed discs 4. The included angle between two adjacent brackets 5 is 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. The hinge block 6 is provided with a wear-resistant bushing, which can improve the rotation flexibility of the outer blade 7. A centrifugal drive mechanism 8 is fixed on the outer wall of the central shaft 3. Multiple sets of angle adjustment mechanisms 9 are engaged on the outer side of the centrifugal drive mechanism 8. The angle adjustment mechanism 9 is hinged to the inner end face of the outer blade 7. Multiple sets of speed suppression mechanisms 10 are fixed on the outer side of the central shaft 3 below the centrifugal drive mechanism 8.

[0039] Current blade angle adjustment methods mostly rely on external power or complex sensor control, which is costly, has a high failure rate, and is difficult to respond to in real time according to wind speed. For solutions to this problem, please refer to... Figure 6 The centrifugal drive mechanism 8 includes a fixed ring 801 fixed to the central shaft 3. Multiple sets of centrifugal cylinders 802, the same number as the outer blades 7, are fixed to the outer wall of the fixed ring 801. Centrifugal blocks 803 move inside the centrifugal cylinders 802. The centrifugal blocks 803 are made of high-density alloy material and can generate sufficient centrifugal force. A toothed rod 804 is fixed to the centrifugal block 803, penetrating and extending to the outside of the centrifugal cylinders 802. A guide sleeve is provided at the contact point between the toothed rod 804 and the centrifugal cylinders 802. The toothed rod 804 is located at the... A spring 805 is fitted on the outer wall inside the centrifugal cylinder 802. One end of the spring 805 abuts against the centrifugal block 803, and the other end abuts against the inner wall of the centrifugal cylinder 802. The centrifugal drive mechanism 8 can be driven and adjusted by the centrifugal force generated by the rotation speed of the central shaft 3 through the cooperation of the centrifugal block 803, the rack 804 and the spring 805, without the need for external power, thus 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 is restored to a reasonable state when the wind speed is low. It is responsive and has a simple structure.

[0040] The existing technology addresses the same issue as described above regarding the angle of attack adjustment for the outer blade 7. For further information, please refer to [link / reference needed]. Figure 7The angle adjustment mechanism 9 includes a fixed block 901 fixed to the centrifuge cylinder 802. A gear 902 is rotatably connected to the fixed block 901. The gear 902 meshes with one side of the rack 804. A gear ring 903 is provided on the outer side of the top of the gear 902. Multiple segmented teeth 904 are provided on the inner wall of the gear ring 903 and mesh with the gear 902. A follower rod 906 is connected to the gear ring 903. One end of the follower rod 906 is connected to an adjusting rod 907. One end of the adjusting rod 907 is movably connected to the inner end face of the outer blade 7 through a hinge block 909. The adjusting rod 907 is rotatably connected to a fixed rod 908. The fixed rod 908 is fixed. It is connected to one side of the centrifuge cylinder 802; through the meshing transmission of gear 902 with rack 804 and gear ring 903, the force is efficiently transmitted and the adjustment accuracy is high; the adjusting rod 907 is supported by the fixed rod 908 to ensure the stability during rotation and reduce the angle of attack adjustment error; the specific adjustment process is as follows: under the action of centrifugal force, the centrifuge block 803 overcomes the elastic force of spring 805 and drives rack 804 to move. Rack 804 drives gear ring 903 to rotate through gear 902. Gear ring 903 pulls / pushes adjusting rod 907 through follower connecting rod 906. Adjusting rod 907 drives outer blade 7 to rotate, so as to adjust the angle of attack of outer blade 7.

[0041] Furthermore, the purpose of designing gear 902, gear ring 903, and follower connecting rod 906 in the above structure is to ensure that the angle of attack of each outer blade 7 is adjusted synchronously, so as to improve the stability of the overall structure in operation.

[0042] Further, please refer to Figure 7 The angle adjustment mechanism 9 also includes multiple support rods 905 fixed to the outer wall of the fixed ring 801. The support rods 905 have a "T" shaped structure, and one end of the support rod 905 is slidably disposed in a groove opened on the inner wall of the toothed ring 903. The support rods 905 provide motion support for the toothed ring 903, so that it can remain stable.

[0043] Traditional connecting rods have a fixed length, making them unadjustable to different fan models or blade sizes, resulting in poor adaptability. Furthermore, the connection between the connecting rod and the blade / gear ring 903 is prone to jamming due to assembly errors. For this issue, please refer to... Figure 10The follower linkage 906 consists of a front rod 9061, a threaded rod 9062, a threaded sleeve 9063, and a rear rod 9064. Both the front rod 9061 and the rear rod 9064 have an "L"-shaped structure. One end of the front rod 9061 is movably inserted into the gear ring 903, and one end of the rear rod 9064 is movably inserted into the adjusting rod 907. The threaded rod 9062 is fixed to the front rod 9061, and the threaded sleeve 9063 is fixed to the rear rod 9064. 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 linkage 906 can be flexibly adjusted to adapt to different outer blade sizes or initial angle of attack requirements, making it highly versatile. The front rod 9061 and the rear rod 9064 adopt a movable insertion method, reducing the impact of assembly errors on adjustment and ensuring smooth transmission.

[0044] Existing speed control systems are mostly independent braking systems, lacking linkage with blade adjustment and exhibiting lag in response. The unstable movement trajectory of braking components leads to uneven braking effects and can easily cause equipment overload. For solutions to this problem, please refer to... Figure 8 The speed-damping mechanism 10 includes a connecting block 1001 fixed to the outer wall of the centrifuge cylinder 803. The connecting block 1001 is movable within a sliding hole 8021 opened on the outer wall of the centrifuge cylinder 802. A slider 1002 is fixedly provided at the bottom of the connecting block 1001. The slider 1002 is slidably disposed within 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 fixed frame 1005 via a pin 1004. The fixed frame 1005 is fixed... A through hole 2 is provided at the bottom of the swing arm 1003, which is attached to the outer wall of the central shaft 3. A slider 2 1006 is slidably disposed 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 disposed on the other end of the push rod 1007. The friction block 1008 is located outside the friction ring 101. The friction ring 101 is fixedly connected to the outer wall of the base 1. Both the friction block 1008 and the friction ring 101 are made of high wear-resistant material. The speed-reducing 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 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 and the braking effect is uniform, effectively avoiding power overload. The specific movement process is as follows: 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 through the action of the first slider 1002, the swing arm 1003 and the second slider 1006. The push rod 1007 drives the friction block 1008 to approach the friction ring 101. Since the speed-reducing mechanism 10 rotates with the central shaft 3, while the friction ring 101 is fixed on the base 1 and remains stationary, the friction block 1008 can provide rotational resistance after contacting the friction ring 101, so as to avoid the problem of the outer blade 7 rotating too fast.

[0045] Furthermore, a guide block 1009 is fixed on the outer wall of the push rod 1007, and the guide block 1009 is slidably disposed in the 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 restrict the push rod 1007 to move only along the axial direction, ensuring that the friction block 1008 and the friction ring 101 are tightly fitted and the force is uniform, thereby improving braking reliability and reducing component wear.

[0046] The aforementioned centrifugal drive mechanism 8, gear 902, and other core components are exposed to the outdoors and are susceptible to rainwater corrosion, leading to rust, jamming, reduced system reliability, and increased maintenance costs. To address this issue, a baffle 12 is fixed to the central shaft 3 above the centrifugal drive mechanism 8. The baffle 12 is made of stainless steel. The baffle 12 can effectively prevent rainwater and other impurities from entering the core mechanism below, reducing environmental corrosion damage to components, extending maintenance cycles, and improving the durability of the device in complex climatic environments.

[0047] Traditional vertical axis fans suffer from insufficient force on the outer blades 7 under light wind conditions, making it difficult to start or operate continuously, resulting in low wind energy utilization. To address this issue, multiple inner blades 11 are fixed to the central shaft 3 between the two sets of fixed disks 4. The inner blades 11 have an arc-shaped spiral structure. The spiral inner blades 11 can efficiently capture the thrust of the light wind airflow and work in conjunction with the outer blades 7 to enhance the driving force under low wind speeds, ensuring stable operation of the fan under light wind conditions, expanding the applicable wind speed range, and improving wind energy utilization.

[0048] The working principle of this embodiment is as follows:

[0049] When the wind speed is low, the outer blade 7 and the inner blade 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, the centrifugal force generated by the centrifugal block 803 is small, and under the action of the elastic force of the spring 805, the centrifugal block 803 and the rack 804 do not move, the gear 902 and the gear ring 903 remain stationary, and the outer blade 7 is in a state with a large angle of attack, which can effectively capture wind energy.

[0050] When the wind speed increases, the rotational 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, causing the rack 804 to move synchronously. The rack 804 meshes with the gear 902, causing the gear 902 to rotate. The gear 902 meshes with the gear ring 903, causing 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 6 through the second hinge block 909, thereby reducing the angle of attack of the outer blade 7 and avoiding the stall problem caused by excessive wind energy input.

[0051] Meanwhile, when the rotational speed of the central shaft 3 is too high, the centrifugal block 803 drives the slider 1002 to slide in the through hole of the swing arm 1003 through the connecting block 1001, causing the swing arm 1003 to rotate around the pin 1004. The swing arm 1003 drives the push rod 1007 to move inward through the slider 2 1006, causing the friction block 1008 to contact the friction ring 101 and generate friction, increasing the resistance to the rotation of the central shaft 3, thereby limiting the rotational speed of the central shaft 3 and avoiding power overload.

[0052] When the wind speed decreases, the centrifugal block 803 moves inward under the elastic force of the spring 805, all mechanisms reset, the angle of attack of the outer blade 7 increases, the friction block 1008 separates from the friction ring 101, and the central shaft 3 can operate efficiently at lower wind speeds.

[0053] It should be noted that the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0054] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An adjustable blade support frame of a vertical axis wind turbine, comprising a base (1), a central shaft (3) is rotatably connected to the base (1) through a rotating seat (2), two groups of fixed discs (4) are fixed on the outer wall of the central shaft (3), a plurality of supports (5) are installed on the fixed discs (4), one end of the support (5) is movably connected with the inner end face of an outer blade (7) through a hinge block one (6), characterized in that: The outer wall of the central shaft (3) is fixed with a centrifugal driving mechanism (8), the outer side of the centrifugal driving mechanism (8) is in transmission engagement with a plurality of angle adjusting mechanisms (9), the angle adjusting mechanism (9) is hinged with the inner end surface of the outer blade (7), and the lower side of the centrifugal driving mechanism (8) is provided with a plurality of speed restraining mechanisms (10) fixed on the outer side of the central shaft (3); The centrifugal driving mechanism (8) comprises a fixed ring (801) fixed on the central shaft (3), a plurality of centrifugal cylinders (802) same in number with the outer blade (7) are fixed on the outer wall of the fixed ring (801), a centrifugal block (803) is movably arranged in the centrifugal cylinder (802), a tooth rod (804) is fixed on the centrifugal block (803) and extends through the centrifugal cylinder (802), and a spring (805) is arranged on the outer wall of the centrifugal cylinder (802) and surrounds the tooth rod (804); The angle adjusting mechanism (9) comprises a fixed block (901) fixed on the centrifugal cylinder (802), a gear (902) rotatably connected to the fixed block (901), the gear (902) is in engagement with one side of the tooth rod (804), a tooth ring (903) is arranged on the top of the gear (902), a plurality of segmented teeth (904) are arranged on the inner wall of the tooth ring (903) and are in engagement with the gear (902), a follow-up connecting rod (906) is connected to the tooth ring (903), one end of the follow-up connecting rod (906) is connected with an adjusting rod (907), the other end of the adjusting rod (907) is movably connected with the inner end surface of the outer blade (7) through a hinge block (909), the adjusting rod (907) is rotatably connected to a fixed rod (908), and the fixed rod (908) is fixed on one side of the centrifugal cylinder (802).

2. An adjustable blade support for a vertical axis wind generator as claimed in claim 1 wherein: The angle adjusting mechanism (9) further comprises a plurality of supporting rods (905) fixed on the outer wall of the fixed ring (801), the supporting rod (905) is in the form of "T", and one end of the supporting rod (905) is slidably arranged in a sliding groove formed in the inner wall of the tooth ring (903).

3. A variable pitch blade support for a vertical axis wind turbine as claimed in claim 1 wherein: The follow-up connecting rod (906) comprises 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 in the form of "L", one end of the front rod body (9061) is movably inserted into the tooth ring (903), one end of the rear rod body (9064) is movably inserted into the adjusting rod (907), the threaded rod (9062) is fixed on the front rod body (9061), the threaded sleeve (9063) is fixed on the rear rod body (9064), and the threaded sleeve (9063) is threadedly connected to the threaded rod (9062).

4. The adjustable blade support frame of a vertical axis wind turbine as claimed in claim 1, wherein: The speed inhibiting mechanism (10) comprises a connecting block (1001) fixed on the outer wall of the centrifugal block (803), the connecting block (1001) is movably arranged in the sliding hole (8021) formed on the outer wall of the centrifugal cylinder (802), the bottom of the connecting block (1001) is fixedly provided with a sliding block one (1002), the sliding block one (1002) is slidably arranged in the through hole one formed on the top of the swing arm (1003), the swing arm (1003) is rotatably connected to the inner side of the fixed frame (1005) through the pin shaft (1004), the fixed frame (1005) is fixedly connected to the outer wall of the central shaft (3), the bottom of the swing arm (1003) is provided with a through hole two, the sliding block two (1006) is slidably arranged in the through hole two, the sliding block two (1006) is fixedly connected to one end of the push rod (1007), the other end of the push rod (1007) is fixedly provided with the friction block (1008), the friction block (1008) is located on the outer side of the friction ring (101), and the friction ring (101) is fixedly connected to the outer wall of the base (1).

5. A variable pitch blade support for a vertical axis wind turbine as claimed in claim 4, wherein: The outer wall of the push rod (1007) is fixedly provided with the guide block (1009), and the guide block (1009) is slidably arranged in the guide hole formed on the bottom of the fixed frame (1005).

6. A variable pitch blade support for a vertical axis wind turbine as claimed in claim 1, characterised in that: The centrifugal driving mechanism (8) is provided with the baffle disc (12) fixed on the central shaft (3).

7. A variable pitch blade support for a vertical axis wind turbine generator as claimed in claim 1 wherein: A plurality of inner blades (11) fixed on the central shaft (3) are arranged between the two groups of fixed discs (4), and the inner blades (11) are in spiral structure with curvature.

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