Bimodal wind driven generator

Abstract

The invention discloses a bimodal wind driven generator. A blade mounting frame of the bimodal wind driven generator is connected to a vertical main shaft in a sleeving manner; the top ends and the bottom ends of a plurality of bimodal blade structures included in the bimodal blade system are connected to a blade mounting frame through ratchet wheel and pawl locking structures, and the bimodal blade structures are evenly arranged around the blade mounting frame. Each bimodal blade structure comprises an inner side blade and an outer side blade, and the opening angle between the inner side blade and the outer side blade is adjusted through a ratchet wheel and pawl locking structure and a gravity reset structure of the inner side blade according to the current wind speed. According to the bimodal wind driven generator, the opening angle between the inner side blade and the outer side blade can be adjusted only depending on the wind speed change without a sensor or an external driving source at different wind speeds, automatic mode switching is achieved, a bimodal blade system is switched between a resistance type fan state or a lift type fan state, and the efficiency of the bimodal wind driven generator is improved. Continuous and stable power generation can be achieved in a sine wind field, and the power generation efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of wind turbine technology, and more particularly to a dual-mode wind turbine. Background Technology

[0002] Wind energy, as a green and renewable energy source, has received widespread attention and importance due to its abundant resources and relatively mature technology. Traditional horizontal axis wind turbines have achieved remarkable success in design and application, but their sensitivity to wind direction, large footprint, and relatively high noise levels limit their application in many scenarios.

[0003] To avoid the aforementioned technical shortcomings of horizontal-axis wind turbines, vertical-axis wind turbines, such as lift-type, drag-type, and lift-drag hybrid types, are also used. Their miniaturization applications are mature and they are widely used in urban buildings, off-grid power supply, communication base stations, and streetlights. However, existing vertical-axis wind turbines still face some technical bottlenecks in power generation efficiency. Specifically, the blades used in vertical-axis wind turbines cannot flexibly switch between different configurations and generally employ drag-type blade structures, resulting in lower power generation efficiency, often lower than that of horizontal-axis wind turbines. This hinders their large-scale adoption and widespread application. Summary of the Invention

[0004] This application provides a dual-mode wind turbine, which aims to solve the problem that the blades used in the prior art cannot flexibly switch modes, resulting in low power generation efficiency.

[0005] This application provides a dual-mode wind turbine, which includes a vertical main shaft, a blade mounting frame, and a dual-mode blade system. The blade mounting frame is sleeved on the vertical main shaft. The top and bottom ends of multiple dual-mode blade structures included in the dual-mode blade system are connected to the blade mounting frame through a ratchet and pawl locking structure, and the multiple dual-mode blade structures are evenly arranged around the blade mounting frame. Each dual-mode blade structure includes an inner blade and an outer blade, and the opening angle between the inner blade and the outer blade is adjusted according to the current wind speed through the ratchet and pawl locking structure and the gravity reset structure of the inner blade, so that the dual-mode blade structure can switch between drag-type wind turbine mode and lift-type wind turbine mode.

[0006] In one possible embodiment, when the opening angle between the inner blade and the outer blade is less than or equal to a first preset wind speed, the inner blade, under the action of the gravity reset structure, makes the opening angle greater than 0°, and makes the dual-mode blade structure a drag-type fan.

[0007] In one possible embodiment, when the opening angle between the inner blade and the outer blade is greater than or equal to a second preset wind speed, the inner blade, under the action of the gravity reset structure, makes the opening angle equal to 0°, and the dual-mode blade structure is in a lift-type fan state.

[0008] In one possible embodiment, the gravity reset structure of the inner blade is configured with the blade's center of mass offset, so that the inner blade is driven by a gravitational torque and satisfies the opening angle being greater than 0° when the current wind speed is less than or equal to the first preset wind speed.

[0009] In one possible embodiment, when the current wind speed is less than or equal to the first preset wind speed, the gravitational torque of the inner blade is greater than the centrifugal torque, such that the opening angle is greater than 0°.

[0010] In one possible embodiment, when the current wind speed is greater than or equal to the second preset wind speed, the gravitational torque of the inner blade is less than or equal to the centrifugal torque, such that the opening angle is equal to 0°.

[0011] In one possible embodiment, the outer blade is mounted at an angle of less than 5° relative to the vertical spindle.

[0012] In one possible embodiment, the ratchet and pawl locking structure includes an inner wheel, a movable pawl assembly, and a ratchet; the ratchet is coaxially arranged with the inner wheel, and the inner wheel is located within the inner ring region of the ratchet; the inner wheel is fixedly connected to one end of the outer blade via a connecting shaft; the ratchet is pivotally connected to the first end of the inner blade; a plurality of ratchet tooth grooves are arranged around the inner ring of the ratchet; the first end of the movable pawl assembly is fixedly connected to the first end face of the inner wheel, and the second end of the movable pawl assembly can also be used to engage or disengage with the ratchet tooth grooves on the inner ring of the ratchet; wherein, one end of the outer blade is the top or bottom end of the outer blade; one end of the inner blade is the top or bottom end of the inner blade and is at the same end as one end of the outer blade.

[0013] In one possible embodiment, the movable pawl assembly includes an elastic element and a pawl; a first end of the elastic element is fixed to a first position on a first end face of the inner wheel; a second end of the pawl is fixed to a second position on the first end face of the inner wheel, the second position being spaced apart from the first position; the second end of the pawl is connected to the second end of the elastic element, and the second end of the pawl can be engaged with a ratchet tooth groove on the inner ring of the ratchet or separated from the ratchet tooth groove on the inner ring of the ratchet under the action of the elastic element.

[0014] In one possible embodiment, when the dual-mode blade structure is in a drag-type fan state, the second end of the pawl separates from the ratchet tooth groove on the inner ring of the ratchet under the action of the elastic element.

[0015] In one possible embodiment, when the dual-mode blade structure is in the form of a lift-type fan, the pawl engages with the ratchet tooth groove on the inner ring of the ratchet, so that the ratchet rotates in a first preset rotation direction.

[0016] In one possible embodiment, the blade mounting frame includes a first Y-shaped frame and a second Y-shaped frame, both of which are sleeved on the vertical main shaft and arranged parallel to each other, with the first Y-shaped frame located above the second Y-shaped frame.

[0017] In one possible embodiment, the angle between each pair of the first frame rod, the second frame rod, and the third frame rod in the first Y-shaped frame is 120°; the angle between each pair of the fourth frame rod, the fifth frame rod, and the sixth frame rod in the second Y-shaped frame is 120°; the fourth frame rod is aligned with the first frame rod, the fifth frame rod is aligned with the second frame rod, and the sixth frame rod is aligned with the third frame rod.

[0018] In one possible embodiment, the plurality of bimodal blade structures in the bimodal blade system include a first bimodal blade structure, a second bimodal blade structure, and a third bimodal blade structure; the top end of the first bimodal blade structure is connected to the bottom end face of the first frame rod via a first ratchet and pawl locking structure, and the bottom end of the first bimodal blade structure is connected to the top end face of the fourth frame rod via a second ratchet and pawl locking structure; the top end of the second bimodal blade structure is connected to the bottom end face of the second frame rod via a third ratchet and pawl locking structure, and the bottom end of the second bimodal blade structure is connected to the top end face of the fifth frame rod via a fourth ratchet and pawl locking structure; the top end of the third bimodal blade structure is connected to the bottom end face of the third frame rod via a fifth ratchet and pawl locking structure, and the bottom end of the third bimodal blade structure is connected to the top end face of the fifth frame rod via a sixth ratchet and pawl locking structure.

[0019] In one possible embodiment, the angle between the outer blade of the first dual-mode blade structure and the radial section of the first frame rod is a first mounting angle and is less than 5°; the angle between the outer blade of the second dual-mode blade structure and the radial section of the second frame rod is a second mounting angle and is less than 5°; and the angle between the outer blade of the third dual-mode blade structure and the radial section of the third frame rod is a third mounting angle and is less than 5°.

[0020] In one possible embodiment, the blade mounting frame includes a first cross-shaped frame and a second cross-shaped frame, both of which are sleeved on the vertical main shaft and arranged parallel to each other, with the first cross-shaped frame located above the second cross-shaped frame.

[0021] In one possible embodiment, the angle between any two adjacent frame beams in the first cross-shaped frame, including the first frame beam, the second frame beam, the third frame beam, and the fourth frame beam, is 90°; the angle between any two adjacent frame beams in the second cross-shaped frame, including the fifth frame beam, the sixth frame beam, the seventh frame beam, and the eighth frame beam, is 90°; the fifth frame beam is aligned with the first frame beam, the sixth frame beam is aligned with the second frame beam, the seventh frame beam is aligned with the third frame beam, and the eighth frame beam is aligned with the fourth frame beam.

[0022] In one possible embodiment, the plurality of dual-mode blade structures in the dual-mode blade system include a first dual-mode blade structure, a second dual-mode blade structure, a third dual-mode blade structure, and a fourth dual-mode blade structure; the top end of the first dual-mode blade structure is connected to the bottom end face of the first frame beam via a first ratchet and pawl locking structure, and the bottom end of the first dual-mode blade structure is connected to the top end face of the fifth frame beam via a second ratchet and pawl locking structure; the top end of the second dual-mode blade structure is connected to the bottom end face of the second frame beam via a third ratchet and pawl locking structure, and the second... The bottom end of the dual-mode blade structure is connected to the top surface of the sixth frame beam via a fourth ratchet and pawl locking structure; the top end of the third dual-mode blade structure is connected to the bottom surface of the third frame beam via a fifth ratchet and pawl locking structure, and the bottom end of the third dual-mode blade structure is connected to the top surface of the seventh frame beam via a sixth ratchet and pawl locking structure; the top end of the fourth dual-mode blade structure is connected to the bottom surface of the fourth frame beam via a seventh ratchet and pawl locking structure, and the bottom end of the fourth dual-mode blade structure is connected to the top surface of the eighth frame beam via an eighth ratchet and pawl locking structure.

[0023] In one possible embodiment, the angle between the outer blade of the first dual-mode blade structure and the radial section of the first frame beam is a first mounting angle and is less than 5°; the angle between the outer blade of the second dual-mode blade structure and the radial section of the second frame beam is a second mounting angle and is less than 5°; the angle between the outer blade of the third dual-mode blade structure and the radial section of the third frame beam is a third mounting angle and is less than 5°; and the angle between the outer blade of the fourth dual-mode blade structure and the radial section of the fourth frame beam is a third mounting angle and is less than 5°.

[0024] In one possible embodiment, the dual-mode wind turbine further includes a generator and a tower; the generator is mounted on the tower; and the vertical main shaft is connected to the rotor of the generator.

[0025] This application provides a dual-mode wind turbine, including a vertical main shaft, a blade mounting frame, and a dual-mode blade system. The blade mounting frame is fitted onto the vertical main shaft. The top and bottom ends of multiple dual-mode blade structures included in the dual-mode blade system are connected to the blade mounting frame via a ratchet and pawl locking structure, and the multiple dual-mode blade structures are evenly arranged around the blade mounting frame. Each dual-mode blade structure includes an inner blade and an outer blade, and the opening angle between the inner and outer blades is adjusted according to the current wind speed through the ratchet and pawl locking structure and the gravity reset structure of the inner blade, so that the dual-mode blade structure can switch between drag-type and lift-type wind turbine modes. The dual-mode wind turbine in this application embodiment can automatically switch modes under different wind speeds without sensors or external drive sources, relying only on wind speed changes to adjust the opening angle between the inner and outer blades. This allows the dual-mode blade system to switch between drag-type and lift-type wind turbine modes, enabling continuous and stable power generation in sinusoidal wind fields and improving power generation efficiency. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of a first embodiment of a dual-mode wind turbine provided in this application. Figure 2 A partial structural schematic diagram of the dual-mode blade structure in the dual-mode wind turbine blade system provided in this application embodiment; Figure 3 A schematic diagram of the closed-loop structure of the dual-mode wind turbine provided in this application embodiment; Figure 4 A schematic diagram of the dual-mode blade structure of the dual-mode wind turbine provided in this application embodiment, in an open state; Figure 5 A schematic diagram of the ratchet and pawl locking structure in the dual-mode blade system of the dual-mode wind turbine provided in this application embodiment; Figure 6 This is a schematic diagram of the structure of a second embodiment of the dual-mode wind turbine provided in this application.

[0028] Explanation of reference numerals in the attached figures: 100. Vertical main shaft; 200. Blade mounting frame; 201. First Y-shaped frame; 2011. First frame rod; 2012. Second frame rod; 2013. Third frame rod; 202. Second Y-shaped frame; 2021. Fourth frame rod; 2022. Fifth frame rod; 2023. Sixth frame rod; 210. First cross-shaped frame; 211. First frame beam; 212. Second frame beam; 213. Third frame beam; 214. Fourth frame beam; 220. Second cross-shaped frame; 221. Fifth frame beam; 222. Sixth frame beam; 223. Seventh frame beam; 224. Eighth frame beam; 300. Dual-mode blade system; 301 3011. Dual-mode blade structure; 3012. Inner blade; 3013. Outer blade; 3014. Ratchet and pawl locking structure; 30131. Inner wheel; 30132. Movable pawl assembly; 301321. Elastic element; 301322. Pawl; 30133. Ratchet; 301331. Ratchet tooth groove; 310. First dual-mode blade structure; 320. Second dual-mode blade structure; 330. Third dual-mode blade structure; 340. Fourth dual-mode blade structure. Detailed Implementation

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0031] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0032] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0033] Please also refer to Figures 1-5 ,in Figure 1 This is a schematic diagram of the structure of a first embodiment of a dual-mode wind turbine provided in this application. Figure 2 A partial structural schematic diagram of the dual-mode blade structure in the dual-mode wind turbine blade system provided in this application embodiment; Figure 3 A schematic diagram of the closed-loop structure of the dual-mode wind turbine provided in this application embodiment; Figure 4 A schematic diagram of the dual-mode blade structure of the dual-mode wind turbine provided in this application embodiment, in an open state; Figure 5 This is a schematic diagram of the ratchet and pawl locking structure in the dual-mode blade system of a dual-mode wind turbine provided in an embodiment of this application. Figures 1-5 As shown, the dual-mode wind turbine includes a vertical main shaft 100, a blade mounting frame 200, and a dual-mode blade system 300. The blade mounting frame 200 is sleeved on the vertical main shaft 100. The top and bottom ends of the multiple dual-mode blade structures included in the dual-mode blade system 300 are connected to the blade mounting frame 200 through a ratchet and pawl locking structure 3013, and the multiple dual-mode blade structures are evenly arranged around the blade mounting frame 200. Each dual-mode blade structure 301 includes an inner blade 3011 and an outer blade 3012. The ratchet and pawl locking structure 3013 and the gravity reset structure (not shown) of the inner blade 3011 adjust the opening angle between the inner blade 3011 and the outer blade 3012 according to the current wind speed, so that the dual-mode blade structure 301 can switch between drag-type wind turbine mode and lift-type wind turbine mode.

[0034] In this embodiment, compared with the vertical axis wind turbine with a single-mode blade structure that cannot adjust the blade drag state to the lift state, the opening angle between the inner blade 3011 and the outer blade 3012 of the dual-mode blade structure 301 in this application can be automatically adjusted with the assistance of the ratchet and pawl locking structure 3013 and the gravity reset structure of the inner blade 3011. The inner blade 3011 of the dual-mode blade structure 301 is closer to the vertical main axis 100 than the outer blade 3012. The inner blade 3011 and outer blade 3012 in the dual-mode blade structure have a shell-like structure and can open and close. The entire dual-mode wind turbine eliminates the need for wind speed sensors or anemometers to detect the current wind speed. Furthermore, the dual-mode blade structure 301 does not require an external drive source (such as a drive motor) to adjust the opening angle between the inner and outer blades; the adjustment is solely driven by wind speed changes, enabling automatic switching between drag-type and lift-type wind turbine modes. Moreover, the entire dual-mode wind turbine employs a purely mechanical structure with minimal electronic components, reducing manufacturing costs and maintenance requirements.

[0035] For example, when the current wind speed is low, the dual-mode blade structure 301 is generally in a drag-type fan mode, and the opening angle between the inner blade 3011 and the outer blade 3012 is greater than 0°, meaning that the inner blade 3011 is in an open state relative to the outer blade 3012. As another example, when the current wind speed is high, the dual-mode blade structure 301 is generally in a lift-type fan mode, and the opening angle between the inner blade 3011 and the outer blade 3012 is equal to 0°, meaning that the inner blade 3011 is in a closed state relative to the outer blade 3012. The terms "low wind speed" and "high wind speed" in the above examples are not explicitly defined and will be further specified in the subsequent descriptions of the embodiments.

[0036] In one embodiment, such as Figures 1-5 As shown, when the current wind speed is less than or equal to the first preset wind speed, the opening angle between the inner blade 3011 and the outer blade 3012 is greater than 0° under the action of the gravity reset structure, and the dual-mode blade structure 301 is in a drag-type fan state.

[0037] In this embodiment, the first preset wind speed can be set to 3 m / s (of course, the specific implementation of the first preset wind speed is not limited to 3 m / s, and any wind speed value in the range of 2 m / s to 3.5 m / s is acceptable). When the current wind speed is less than or equal to the first preset wind speed, the current environment of the dual-mode wind turbine is a low wind speed state. In the low wind speed state (which can also be understood as a light breeze state) or in the windless state, the inner blade 3011, under the action of the gravity reset structure, makes the opening angle greater than 0°, and the dual-mode blade structure 301 is not closed and does not form a closed shell state. At this time, the streamlined structure of the inner and outer blades is not formed, and the dual-mode blade structure 301 is in a drag-type wind turbine state. In specific implementation, the starting wind speed of the dual-mode blade structure 301 is 1.5 m / s, that is, when the current wind speed is greater than 1.5 m / s, the dual-mode blade system 300 can drive the blade mounting frame 200 to rotate around the vertical main axis 100 under the action of wind force.

[0038] In one embodiment, such as Figures 1-5 As shown, when the current wind speed is greater than or equal to the second preset wind speed, the opening angle between the inner blade 3011 and the outer blade 3012 is such that, under the action of the gravity reset structure, the inner blade makes the opening angle equal to 0°, and the dual-mode blade structure is in the state of a lift-type fan.

[0039] In this embodiment, the second preset wind speed can be set to 4 m / s (of course, the specific implementation of the second preset wind speed is not limited to 4 m / s; any wind speed value in the range of 3.6 m / s to 5 m / s is acceptable). When the current wind speed is greater than or equal to the second preset wind speed, the current environment of the dual-mode wind turbine is a medium-high wind speed state. Under the medium-high wind speed state, the inner blade 3011, under the action of the gravity reset structure, makes the opening angle equal to 0°, and makes the dual-mode blade structure 301 closed and in a closed shell state. At this time, the streamlined structure of the inner and outer blades has been formed (when the wind speed does not decrease, the inner and outer blades no longer open, and when the wind speed decreases, the inner blade opens relative to the outer blade), and the dual-mode blade structure 301 is in a lift-type wind turbine state. For example, when the dual-mode blade structure 301 is in a lift-type wind turbine state, it is suitable for operation in the wind speed range of 4-25 m / s.

[0040] In one embodiment, such as Figures 1-5As shown, the gravity reset structure of the inner blade 3011 is set with the blade's center of mass offset, so that the inner blade 3011 is driven by gravity torque and satisfies the opening angle being greater than 0° when the current wind speed is less than or equal to the first preset wind speed; wherein, when the current wind speed is less than or equal to the first preset wind speed, the gravity torque of the inner blade 3011 is greater than the centrifugal torque, so that the opening angle is greater than 0°.

[0041] In this embodiment, the gravity reset structure of the inner blade 3011 is set with the blade's center of mass offset. As long as the blade structure meets the above conditions, it is acceptable. With this structural setting, as long as the current wind speed does not exceed the first preset wind speed, the inner blade 3011, due to its center of mass offset setting, has a gravitational torque greater than the centrifugal torque. Under the dominant effect of the gravitational torque, the inner blade 3011 moves closer to the vertical main axis 100, so that the opening angle is greater than 0°. At this time, the streamlined structure of the inner and outer blades is not formed, and the dual-mode blade structure 301 is in a drag-type fan state. When the wind speed gradually weakens, the inner blade 3011 automatically resets until it recovers to the maximum opening angle with the outer blade 3012 in the windless state (at this time, the dwell position of the inner blade can be regarded as its initial position), avoiding downtime losses.

[0042] In one embodiment, such as Figures 1-5 As shown, when the current wind speed is greater than or equal to the second preset wind speed, the gravitational torque of the inner blade 3011 is less than or equal to the centrifugal torque, so that the opening angle is equal to 0°.

[0043] In this embodiment, when the gravity reset structure in the inner blade 3011 still adopts the blade centroid offset setting, as long as the current wind speed is greater than or equal to the second preset wind speed, the inner blade 3011, due to its centroid offset setting, has a gravitational torque that is less than the centrifugal torque. Under the dominant action of the centrifugal torque, the inner blade 3011 moves towards a direction closer to the vertical main axis 100, so that the opening angle is equal to 0°. At this time, the streamlined structure of the inner and outer blades has been formed, and the dual-mode blade structure 301 is in the state of a lift-type fan.

[0044] In one embodiment, such as Figures 1-5 As shown, the installation angle of the outer blade 3012 relative to the vertical main shaft 100 is less than 5°.

[0045] In this embodiment, if the vertical main shaft 100 adopts a cylindrical rod structure in specific implementation, the outer blade 3012 is not directly mounted on the vertical main shaft 100, but is connected to the blade mounting frame 200. Taking the outer blade 3012 connected to the end of the blade mounting frame 200 away from the vertical main shaft 100 as an example, the included angle between the plane corresponding to the end of the blade mounting frame 200 away from the vertical main shaft 100 and the outer blade 3012 can be obtained. This included angle is regarded as the mounting angle of the outer blade 3012 relative to the vertical main shaft 100. This structural setting can form a basic lifting frame.

[0046] In one embodiment, such as Figures 1-5 As shown, the ratchet and pawl locking structure 3013 includes an inner wheel 30131, a movable pawl assembly 30132, and a ratchet 30133; the ratchet 30133 is coaxially arranged with the inner wheel 30131, and the inner wheel 30131 is located within the inner ring area of ​​the ratchet 30133; the inner wheel 30131 is fixed to one end of the outer blade 3012 via a connecting shaft (not shown); the ratchet 30133 is connected to the first end of the inner blade 3011 via a pivot (not shown); a ring is arranged around the inner ring of the ratchet 30133. Multiple ratchet tooth grooves 301331; the first end of the movable pawl assembly 30132 is fixed to the first end face of the inner wheel 30131, and the second end of the movable pawl assembly 30132 can also be used to engage or disengage with the ratchet tooth grooves 301331 on the inner ring of the ratchet 30133; wherein, one end of the outer blade 3012 is the top or bottom end of the outer blade 3012; one end of the inner blade 3011 is the top or bottom end of the inner blade 3011 and is at the same end as one end of the outer blade 3012.

[0047] In this embodiment, taking a ratchet and pawl locking structure 3013 located at the top of the same dual-mode blade structure 301 as an example, the inner wheel 30131 of the ratchet and pawl locking structure 3013 is fixed to the top of the outer blade 3012 via a connecting shaft, and the ratchet 30133 is pivotally connected to the top of the inner blade 3011. When the dual-mode blade structure 301 automatically switches between the two modes of drag-type fan mode and lift-type fan mode, the outer blade 3012 does not rotate around the connecting shaft and the inner wheel 30131 does not rotate around the connecting shaft. The inner blade 3011 can rotate around the pivot, driving the ratchet 30133 to rotate synchronously.

[0048] Furthermore, since the first end of the movable pawl assembly 30132 is fixed to the first end face of the inner wheel 30131, and the second end of the movable pawl assembly 30132 is closer to the inner ring of the ratchet 30133, the second end of the movable pawl assembly 30132 can also be used to engage or disengage with the ratchet tooth groove 301331 on the inner ring of the ratchet 30133. When the second end of the movable pawl assembly 30132 engages with the ratchet tooth groove 301331 on the inner ring of the ratchet 30133, it prevents the ratchet 30133 from rotating in the opposite direction and ensures that the opening angle between the inner blade 3011 and the outer blade 3012 is greater than 0°, ensuring that the dual-mode blade structure closes only on the downwind side and does not repeatedly move. It can be seen that the ratchet and pawl locking structure forces the dual-mode blade structure to rotate in one direction, eliminating the repeated opening and closing of the blades during the rotation cycle (such as avoiding accidental opening on the upwind side), and improving the structural lifespan.

[0049] In one embodiment, such as Figures 1-5 As shown, the movable pawl assembly 30132 includes an elastic element 301321 and a pawl 301322; the first end of the elastic element 301321 is fixed to a first position on the first end face of the inner wheel 30131; the second end of the pawl 301322 is fixed to a second position on the first end face of the inner wheel 30131, and there is a gap between the second position and the first position; the second end of the pawl 301322 is connected to the second end of the elastic element 301321, and the second end of the pawl 301322 can be used to engage with the ratchet tooth groove 301331 on the inner ring of the ratchet 30133 or to separate from the ratchet tooth groove 301331 on the inner ring of the ratchet 30133 under the action of the elastic element 301321; When the dual-mode blade structure 301 is in a drag-type fan state, the second end of the pawl 301322 separates from the ratchet tooth groove 301331 on the inner ring of the ratchet 30133 under the action of the elastic member 301321. When the dual-mode blade structure 301 is in the lift-type fan state, the pawl 301322 engages with the ratchet tooth groove 301331 on the inner ring of the ratchet 30133, so that the ratchet 30133 rotates in the first preset rotation direction.

[0050] In this embodiment, when the movable pawl assembly 30132 is configured as described above, the elastic element 301321 can specifically be an elastic element such as a torsion spring, and the pawl 301322 can be an arc-shaped structure with a certain curvature and length, so that it can both separate from and engage with the ratchet tooth groove 301331 on the inner ring of the ratchet 30133. When the current wind speed is greater than or equal to the second preset wind speed, during the rotation of the dual-mode blade structure, the inner blade 3011 is moved closer to the outer blade 3012 by centrifugal force, and the pawl 301322 opens and can eventually engage with the ratchet tooth groove 301331 on the inner ring of the ratchet 30133. Furthermore, since the inner wheel 30131 is fixed on the outer blade 3012 and remains stationary, and the ratchet 30133 rotates with the inner blade 3011, it can only rotate counterclockwise due to the restriction of the pawl 301322, so as to avoid the inner blade opening on the windward side and closing on the windward side, thus avoiding repeated closing.

[0051] In one embodiment, such as Figures 1-5 As shown, the blade mounting frame 200 includes a first Y-shaped frame 201 and a second Y-shaped frame 202. The second Y-shaped frame 202 and the first Y-shaped frame 201 are both sleeved on the vertical main shaft 100 and arranged parallel to each other. The first Y-shaped frame 201 is located above the second Y-shaped frame 202.

[0052] In this embodiment, as a first specific embodiment of the blade mounting frame 200, two parallel Y-shaped frames are sequentially fitted onto the blade mounting frame 200 from top to bottom, specifically a first Y-shaped frame 201 and a second Y-shaped frame 202. Using these two Y-shaped frames, three bimodal blade structures can be connected and evenly distributed around the blade mounting frame 200.

[0053] In one embodiment, such as Figures 1-5 As shown, the first Y-shaped frame 201 includes a first frame rod 2011, a second frame rod 2012, and a third frame rod 2013, with each pair of the included angles being 120°; the second Y-shaped frame 202 includes a fourth frame rod 2021, a fifth frame rod 2022, and a sixth frame rod 2023, with each pair of the included angles being 120°; the fourth frame rod 2021 is aligned with the first frame rod 2011, the fifth frame rod 2022 is aligned with the second frame rod 2012, and the sixth frame rod 2023 is aligned with the third frame rod 2013.

[0054] In this embodiment, when the included angle between any two of the three frame rods in the first Y-shaped frame 201 is 120°, and the included angle between any two of the three frame rods in the second Y-shaped frame 202 is 120°, and the fourth frame rod 2021 is aligned with the first frame rod 2011, the fifth frame rod 2022 is aligned with the second frame rod 2012, and the sixth frame rod 2023 is aligned with the third frame rod 2013, a fixed frame structure capable of uniformly connecting three dual-mode blade structures is formed. Furthermore, the aforementioned Y-shaped frame structure is also easy to process and shape.

[0055] In one embodiment, such as Figures 1-5 As shown, the plurality of dual-mode blade structures in the dual-mode blade system 300 include a first dual-mode blade structure 310, a second dual-mode blade structure 320, and a third dual-mode blade structure 330; the top end of the first dual-mode blade structure 310 is connected to the bottom end face of the first frame rod 2011 via a first ratchet and pawl locking structure, and the bottom end of the first dual-mode blade structure 310 is connected to the top end face of the fourth frame rod 2021 via a second ratchet and pawl locking structure; the second dual-mode blade structure... The top end of the structure 320 is connected to the bottom end face of the second frame rod 2012 via a third ratchet and pawl locking structure; the bottom end of the second dual-mode blade structure is connected to the top end face of the fifth frame rod 2022 via a fourth ratchet and pawl locking structure; the top end of the third dual-mode blade structure 330 is connected to the bottom end face of the third frame rod 2013 via a fifth ratchet and pawl locking structure; and the bottom end of the third dual-mode blade structure is connected to the top end face of the sixth frame rod 2023 via a sixth ratchet and pawl locking structure.

[0056] In this embodiment, the specific structures of the first dual-mode blade structure 310, the second dual-mode blade structure 320, and the third dual-mode blade structure 330 are all based on the specific structure of the dual-mode blade structure 301. Furthermore, the first ratchet and pawl locking structure, the second ratchet and pawl locking structure, the third ratchet and pawl locking structure, the fourth ratchet and pawl locking structure, the fifth ratchet and pawl locking structure, and the sixth ratchet and pawl locking structure are all based on the specific structure of the ratchet and pawl locking structure 3013. These details will not be repeated here. It is evident that when three dual-mode blade structures arranged in a Y-shape are used to form a dual-mode blade system, not only is the structure stable, but a better balance can be achieved in terms of aerodynamic efficiency, dynamic balance, cost, and structural reliability when using a smaller number of dual-mode blade structures.

[0057] In one embodiment, such as Figures 1-5As shown, the angle between the outer blade of the first dual-mode blade structure 310 and the radial section of the first frame rod 2011 is the first installation angle and is less than 5°; the angle between the outer blade of the second dual-mode blade structure 320 and the radial section of the second frame rod 2012 is the second installation angle and is less than 5°; the angle between the outer blade of the third dual-mode blade structure 330 and the radial section of the third frame rod 2013 is the third installation angle and is less than 5°.

[0058] In this embodiment, the included angle between the radial section of the outer blade 3012 and the first frame rod 2011 (or the second frame rod 2012 or the third frame rod 2013) is regarded as the installation angle of the outer blade 3012 relative to the vertical main shaft 100. By setting up this small angle installation structure, a basic lifting frame can be formed.

[0059] In one embodiment, such as Figures 2-6 As shown, the blade mounting frame 200 includes a first cross-shaped frame 210 and a second cross-shaped frame 220. The second cross-shaped frame 220 and the first cross-shaped frame 210 are both sleeved on the vertical main shaft 100 and arranged parallel to each other. The first cross-shaped frame 210 is located above the second cross-shaped frame 220.

[0060] In this embodiment, as a second specific embodiment of the blade mounting frame 200, two parallel, cross-shaped frames are sequentially fitted onto the blade mounting frame 200 from top to bottom. Specifically, these are a first cross-shaped frame 210 and a second cross-shaped frame 220. Using these two cross-shaped frames, four dual-mode blade structures can be connected and evenly distributed around the blade mounting frame 200.

[0061] In one embodiment, such as Figures 2-6 As shown, in the first cross-shaped frame 210, the included angle between any two adjacent frame beams of the first frame beam 211, second frame beam 212, third frame beam 213, and fourth frame beam 214 is 90°; in the second cross-shaped frame 220, the included angle between any two adjacent frame beams of the fifth frame beam 221, sixth frame beam 222, seventh frame beam 223, and eighth frame beam 224 is 90°; the fifth frame beam 221 is aligned with the first frame beam 211, the sixth frame beam 222 is aligned with the second frame beam 212, the seventh frame beam 223 is aligned with the third frame beam 213, and the eighth frame beam 224 is aligned with the fourth frame beam 214.

[0062] In this embodiment, when the included angle between any two adjacent frame beams in the four frame beams included in the first cross-shaped frame 210 is 90°, and the included angle between any two adjacent frame beams in the four frame beams included in the second cross-shaped frame 220 is 90°, and the fifth frame beam 221 is aligned with the first frame beam 211, the sixth frame beam 222 is aligned with the second frame beam 212, the seventh frame beam 223 is aligned with the third frame beam 213, and the eighth frame beam 224 is aligned with the fourth frame beam 214, another fixed frame structure that can uniformly connect four dual-mode blade structures is formed. Moreover, the above-mentioned cross-shaped frame structure is also easy to process and form.

[0063] In one embodiment, such as Figures 2-6 As shown, the plurality of dual-mode blade structures in the dual-mode blade system 300 include a first dual-mode blade structure 310, a second dual-mode blade structure 320, a third dual-mode blade structure 330, and a fourth dual-mode blade structure 340. The top end of the first dual-mode blade structure 310 is connected to the bottom end face of the first frame beam 211 via a first ratchet and pawl locking structure, and the bottom end of the first dual-mode blade structure 310 is connected to the top end face of the fifth frame beam 221 via a second ratchet and pawl locking structure. The top end of the second dual-mode blade structure 320 is connected to the bottom end face of the second frame beam 212 via a third ratchet and pawl locking structure. The bottom end of the first dual-mode blade structure 320 is connected to the top end face of the sixth frame beam 222 via a fourth ratchet and pawl locking structure; the top end of the third dual-mode blade structure 330 is connected to the bottom end face of the third frame beam 213 via a fifth ratchet and pawl locking structure, and the bottom end of the third dual-mode blade structure 330 is connected to the top end face of the seventh frame beam 223 via a sixth ratchet and pawl locking structure; the top end of the fourth dual-mode blade structure 340 is connected to the bottom end face of the fourth frame beam 214 via a seventh ratchet and pawl locking structure, and the bottom end of the fourth dual-mode blade structure 340 is connected to the top end face of the eighth frame beam 224 via an eighth ratchet and pawl locking structure.

[0064] In this embodiment, the specific structures of the first dual-mode blade structure 310, the second dual-mode blade structure 320, the third dual-mode blade structure 330, and the fourth dual-mode blade structure 340 all refer to the specific structure of the dual-mode blade structure 301. Furthermore, the first ratchet and pawl locking structure, the second ratchet and pawl locking structure, the third ratchet and pawl locking structure, the fourth ratchet and pawl locking structure, the fifth ratchet and pawl locking structure, the sixth ratchet and pawl locking structure, the seventh ratchet and pawl locking structure, and the eighth ratchet and pawl locking structure all refer to the specific structure of the ratchet and pawl locking structure 3013. These details will not be elaborated upon here. It is evident that when four dual-mode blade structures arranged in a cross shape are used to form a dual-mode blade system, not only is the structure stable, but a better balance can be achieved in terms of aerodynamic efficiency, dynamic balance, cost, and structural reliability when using a smaller number of dual-mode blade structures.

[0065] In one embodiment, such as Figures 2-6 As shown, the angle between the outer blade of the first dual-mode blade structure 310 and the radial section of the first frame beam is the first installation angle and is less than 5°; the angle between the outer blade of the second dual-mode blade structure 320 and the radial section of the second frame beam is the second installation angle and is less than 5°; the angle between the outer blade of the third dual-mode blade structure 330 and the radial section of the third frame beam is the third installation angle and is less than 5°; the angle between the outer blade of the fourth dual-mode blade structure 340 and the radial section of the fourth frame beam is the third installation angle and is less than 5°.

[0066] In this embodiment, the included angle between the radial sections of the outer blade 3012 and the first frame beam 211 (second frame beam 212, third frame beam 213 or fourth frame beam 214) is regarded as the installation angle of the outer blade 3012 relative to the vertical main shaft 100. By setting up this small angle installation structure, a basic lifting frame can be formed.

[0067] In one embodiment, the dual-mode wind turbine further includes a generator and a tower; the generator is mounted on the tower; and the vertical main shaft is connected to the rotor of the generator.

[0068] In this embodiment, the structure of the vertical main shaft and above in the dual-mode wind turbine was described in detail in the previous embodiments. In specific implementation, the vertical main shaft 100 is connected to the rotor of the generator (not shown); at the same time, the generator is mounted on the tower (not shown). Additionally, the tower is also equipped with structures such as the yaw system required by the wind turbine. Because the structure of the vertical main shaft and above has been redesigned in this application, while the main structure of the wind turbine below the vertical main shaft has not been redesigned, the main structure of the wind turbine below the vertical main shaft will not be described in detail here.

[0069] In summary, the dual-mode wind turbine in this embodiment includes a vertical main shaft, a blade mounting frame, and a dual-mode blade system. The blade mounting frame is fitted onto the vertical main shaft. The top and bottom ends of the multiple dual-mode blade structures included in the dual-mode blade system are connected to the blade mounting frame via a ratchet and pawl locking structure, and the multiple dual-mode blade structures are evenly arranged around the blade mounting frame. Each dual-mode blade structure includes an inner blade and an outer blade, and the opening angle between the inner and outer blades is adjusted according to the current wind speed via the ratchet and pawl locking structure and the gravity reset structure of the inner blade, so that the dual-mode blade structure can switch between drag-type and lift-type wind turbine states. The dual-mode wind turbine in this embodiment can automatically switch modes under different wind speeds without the need for sensors or external drive sources, relying solely on wind speed changes to adjust the opening angle between the inner and outer blades. This allows the dual-mode blade system to switch between drag-type and lift-type wind turbine modes, enabling continuous and stable power generation in sinusoidal wind fields and improving power generation efficiency.

[0070] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A dual-mode wind turbine generator, characterized in that, The system includes a vertical main shaft, a blade mounting frame, and a dual-mode blade system. The blade mounting frame is fitted onto the vertical main shaft. The top and bottom ends of multiple dual-mode blade structures included in the dual-mode blade system are connected to the blade mounting frame via a ratchet and pawl locking structure, and the multiple dual-mode blade structures are evenly arranged around the blade mounting frame. Each dual-mode blade structure includes an inner blade and an outer blade, and the opening angle between the inner blade and the outer blade is adjusted according to the current wind speed via the ratchet and pawl locking structure and the gravity reset structure of the inner blade, so that the dual-mode blade structure can switch between drag-type and lift-type wind turbine states.

2. The dual-mode wind turbine generator according to claim 1, characterized in that, When the current wind speed is less than or equal to a first preset wind speed, the opening angle between the inner blade and the outer blade is greater than 0° under the action of the gravity reset structure, and the dual-mode blade structure is in a drag-type fan state.

3. The dual-mode wind turbine generator according to claim 2, characterized in that, When the current wind speed is greater than or equal to the second preset wind speed, the opening angle between the inner blade and the outer blade is such that, under the action of the gravity reset structure, the opening angle of the inner blade is equal to 0°, and the dual-mode blade structure is in a lift-type fan state.

4. The dual-mode wind turbine generator according to claim 2, characterized in that, The gravity reset structure of the inner blade is set with the blade's center of mass offset, so that the inner blade is driven by gravity torque when the current wind speed is less than or equal to the first preset wind speed and the opening angle is greater than 0°.

5. The dual-mode wind turbine generator according to claim 4, characterized in that, When the current wind speed is less than or equal to the first preset wind speed, the gravitational torque of the inner blade is greater than the centrifugal torque, so that the opening angle is greater than 0°.

6. The dual-mode wind turbine generator according to claim 3, characterized in that, When the current wind speed is greater than or equal to the second preset wind speed, the gravitational torque of the inner blade is less than or equal to the centrifugal torque, so that the opening angle is equal to 0°.

7. The dual-mode wind turbine generator according to claim 3, characterized in that, The installation angle of the outer blade relative to the vertical spindle is less than 5°.

8. The dual-mode wind turbine generator according to any one of claims 1-7, characterized in that, The ratchet and pawl locking structure includes an inner wheel, a movable pawl assembly, and a ratchet; the ratchet and the inner wheel are coaxially arranged, and the inner wheel is located within the inner ring area of ​​the ratchet; the inner wheel is fixedly connected to one end of the outer blade via a connecting shaft; the ratchet is pivotally connected to the first end of the inner blade; a plurality of ratchet tooth grooves are arranged around the inner ring of the ratchet; the first end of the movable pawl assembly is fixedly connected to the first end face of the inner wheel, and the second end of the movable pawl assembly can also be used to engage or disengage with the ratchet tooth grooves on the inner ring of the ratchet; wherein, one end of the outer blade is the top or bottom end of the outer blade; one end of the inner blade is the top or bottom end of the inner blade and is at the same end as one end of the outer blade.

9. The dual-mode wind turbine generator according to claim 8, characterized in that, The movable pawl assembly includes an elastic element and a pawl; a first end of the elastic element is fixed to a first position on a first end face of the inner wheel; a second end of the pawl is fixed to a second position on the first end face of the inner wheel, and there is a gap between the second position and the first position; the second end of the pawl is connected to the second end of the elastic element, and the second end of the pawl can be engaged with the ratchet tooth groove on the inner ring of the ratchet or separated from the ratchet tooth groove on the inner ring of the ratchet under the action of the elastic element.

10. The dual-mode wind turbine generator according to claim 9, characterized in that, When the dual-mode blade structure is in drag-type fan mode, the second end of the pawl separates from the ratchet tooth groove on the inner ring of the ratchet under the action of the elastic element.

11. The dual-mode wind turbine generator according to claim 10, characterized in that, When the dual-mode blade structure is in the form of a lift-type fan, the pawl engages with the ratchet tooth groove on the inner ring of the ratchet, so that the ratchet rotates in a first preset rotation direction.

12. The dual-mode wind turbine generator according to claim 8, characterized in that, The blade mounting frame includes a first Y-shaped frame and a second Y-shaped frame. The second Y-shaped frame and the first Y-shaped frame are both sleeved on the vertical main shaft and arranged parallel to each other. The first Y-shaped frame is located above the second Y-shaped frame.

13. The dual-mode wind turbine generator according to claim 12, characterized in that, The first Y-shaped frame includes a first frame rod, a second frame rod, and a third frame rod, each with an included angle of 120°; the second Y-shaped frame includes a fourth frame rod, a fifth frame rod, and a sixth frame rod, each with an included angle of 120°; the fourth frame rod is aligned with the first frame rod, the fifth frame rod is aligned with the second frame rod, and the sixth frame rod is aligned with the third frame rod.

14. The dual-mode wind turbine generator according to claim 13, characterized in that, The plurality of bimodal blade structures in the bimodal blade system include a first bimodal blade structure, a second bimodal blade structure, and a third bimodal blade structure; The top end of the first dual-mode blade structure is connected to the bottom end face of the first frame rod through a first ratchet and pawl locking structure, and the bottom end of the first dual-mode blade structure is connected to the top end face of the fourth frame rod through a second ratchet and pawl locking structure. The top end of the second dual-mode blade structure is connected to the bottom end face of the second frame rod through a third ratchet and pawl locking structure, and the bottom end of the second dual-mode blade structure is connected to the top end face of the fifth frame rod through a fourth ratchet and pawl locking structure. The top end of the third bimodal blade structure is connected to the bottom end face of the third frame rod via a fifth ratchet and pawl locking structure, and the bottom end of the third bimodal blade structure is connected to the top end face of the fifth frame rod via a sixth ratchet and pawl locking structure.

15. The dual-mode wind turbine generator according to claim 14, characterized in that, The angle between the outer blade of the first dual-mode blade structure and the radial section of the first frame rod is taken as the first installation angle and is less than 5°; the angle between the outer blade of the second dual-mode blade structure and the radial section of the second frame rod is taken as the second installation angle and is less than 5°; the angle between the outer blade of the third dual-mode blade structure and the radial section of the third frame rod is taken as the third installation angle and is less than 5°.

16. The dual-mode wind turbine generator according to claim 8, characterized in that, The blade mounting frame includes a first cross-shaped frame and a second cross-shaped frame. The second cross-shaped frame and the first cross-shaped frame are both sleeved on the vertical main shaft and arranged parallel to each other. The first cross-shaped frame is located above the second cross-shaped frame.

17. The dual-mode wind turbine generator according to claim 16, characterized in that, The first cross-shaped frame includes a first frame beam, a second frame beam, a third frame beam, and a fourth frame beam, in which the included angle between any two adjacent frame beams is 90°; the second cross-shaped frame includes a fifth frame beam, a sixth frame beam, a seventh frame beam, and an eighth frame beam, in which the included angle between any two adjacent frame beams is 90°; the fifth frame beam is aligned with the first frame beam, the sixth frame beam is aligned with the second frame beam, the seventh frame beam is aligned with the third frame beam, and the eighth frame beam is aligned with the fourth frame beam.

18. The dual-mode wind turbine generator according to claim 17, characterized in that, The plurality of bimodal blade structures in the bimodal blade system include a first bimodal blade structure, a second bimodal blade structure, a third bimodal blade structure, and a fourth bimodal blade structure; The top end of the first dual-mode blade structure is connected to the bottom end face of the first frame beam through a first ratchet and pawl locking structure, and the bottom end of the first dual-mode blade structure is connected to the top end face of the fifth frame beam through a second ratchet and pawl locking structure. The top end of the second dual-mode blade structure is connected to the bottom end face of the second frame beam through a third ratchet and pawl locking structure, and the bottom end of the second dual-mode blade structure is connected to the top end face of the sixth frame beam through a fourth ratchet and pawl locking structure. The top end of the third dual-mode blade structure is connected to the bottom end face of the third frame beam through a fifth ratchet and pawl locking structure, and the bottom end of the third dual-mode blade structure is connected to the top end face of the seventh frame beam through a sixth ratchet and pawl locking structure. The top end of the fourth dual-mode blade structure is connected to the bottom end face of the fourth frame beam via a seventh ratchet and pawl locking structure, and the bottom end of the fourth dual-mode blade structure is connected to the top end face of the eighth frame beam via an eighth ratchet and pawl locking structure.

19. The dual-mode wind turbine generator according to claim 18, characterized in that, The angle between the outer blade of the first dual-mode blade structure and the radial section of the first frame beam is taken as the first installation angle and is less than 5°; the angle between the outer blade of the second dual-mode blade structure and the radial section of the second frame beam is taken as the second installation angle and is less than 5°; the angle between the outer blade of the third dual-mode blade structure and the radial section of the third frame beam is taken as the third installation angle and is less than 5°; the angle between the outer blade of the fourth dual-mode blade structure and the radial section of the fourth frame beam is taken as the third installation angle and is less than 5°.

20. The dual-mode wind turbine generator according to claim 8, characterized in that, It also includes a generator and a tower; the generator is mounted on the tower; the vertical main shaft is connected to the rotor of the generator.

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