Ducted double-turbine supercharged windmill

Abstract

The invention relates to the technical field of wind power generation, and particularly discloses a duct double-turbine supercharged windmill which comprises a duct and a blade type rotating structure arranged in the duct. The duct sequentially comprises a first contraction section, a first straight section, a second contraction section and a second straight section in the air flow direction, and the diameter of the first straight section is larger than that of the second straight section. The blade type rotating structure comprises a rotating shaft, a first-stage turbine and a second-stage turbine, the first-stage turbine and the second-stage turbine are arranged on the rotating shaft, the first-stage turbine and the second-stage turbine are correspondingly arranged on the first straight section and the second straight section respectively, and the rotating shaft is connected with the generator through a transmission structure. Structural improvement is carried out through the blade type rotating structure and the duct, the turbofan located at the front end drives the turbofan located at the rear end to rotate, and therefore the wind energy utilization rate is increased.

Description

Technical Field

[0001] This invention relates to the field of wind power generation technology, specifically to a ducted twin-turbocharged wind turbine. Background Technology

[0002] Converting wind energy into electricity using rotating blades is a common method of wind power generation. This mainly includes open-type wind turbines and ducted wind turbines. Open-type wind turbines use a blade-like structure, resulting in a bulky size, making them suitable for high-wind areas, but also extremely expensive. Ducted wind turbines consist of a duct casing, inside which a turbine fan is installed. Ducted wind turbines utilize the rotating turbine fan to draw kinetic energy from the fluid passing through it, and then use this kinetic energy to generate electricity through a generator. Ducted wind turbines are suitable for outdoor wind power generation, especially in high-altitude, high-wind areas.

[0003] Existing ducted wind turbines suffer from low wind energy utilization. For example, CN209943006U, a type of ducted turbine AC / DC wind turbine, has its front and rear impellers installed at opposite ends of the AC / DC generator in the direction of wind flow. Both the front and rear impellers are installed within equal-diameter sections of the casing. This installation method causes the front and rear impellers to rotate independently. That is, the rotation of the front impeller cannot drive the rotation of the rear impeller. A certain wind speed is required inside the casing for both the front and rear impellers to rotate. At low wind speeds, only the front impeller can rotate, while the rear impeller cannot, resulting in low wind energy utilization. Summary of the Invention

[0004] The purpose of this invention is to provide a ducted twin-turbocharged wind turbine, which improves the wind energy utilization rate by improving the structure through a blade-type rotating structure and duct. The front-end turbine fan drives the rear-end turbine fan to rotate.

[0005] This invention is achieved through the following technical solution: The ducted twin-turbocharged wind turbine includes a duct and a blade-type rotating structure disposed within the duct; the duct includes, in sequence along the airflow direction, a first contraction section, a first straight section, a second contraction section, and a second straight section, wherein the diameter of the first straight section is larger than the diameter of the second straight section; The blade-type rotating structure includes a rotating shaft and a first-stage turbine and a second-stage turbine mounted on the rotating shaft. The first-stage turbine and the second-stage turbine are respectively located in the first straight section and the second straight section. The rotating shaft is connected to the generator through a transmission structure.

[0006] Existing ducts have a constant diameter structure, which is not conducive to airflow acceleration within the duct. When the wind speed is low, the rear impeller at the rear end cannot rotate. In this invention, the diameters of both the first and second contraction sections gradually decrease from the direction of airflow. The first contraction section is the airflow inlet section, the first straight section is the rectification section, and the second straight section is the diffusion section. External airflow enters the duct through the first contraction section and then enters the first straight section. Since the first straight section has a constant diameter structure and a certain length, the airflow is rectified within it. A first-stage turbine is installed within the first straight section. When the airflow causes the first-stage turbine to rotate, the rotation of the first-stage turbine has a pressurizing effect on the airflow. Subsequently, the airflow enters the second contraction section, where the diameter change further increases the pressure. The pressurized airflow enters the second straight section, accelerating the rotation of the second-stage turbine. The airflow is then discharged from the duct through the second straight section, achieving airflow diffusion.

[0007] The duct of this invention forms a hyperbolic guide wall through a first and second contraction section, enabling secondary acceleration of airflow within the duct. Airflow passing through the first contraction section experiences initial acceleration due to the diameter change of that section, and airflow passing through the second contraction section experiences secondary acceleration due to the diameter change of that section. This allows the ducted twin-turbocharged wind turbine to start even at low wind speeds. Simultaneously, the rotation of the first-stage turbine within the first straight section also pressurizes the airflow. Thus, this invention achieves dual pressurization through the duct structure design and the rotation of the first-stage turbine, ensuring that the second-stage turbine can rotate rapidly to better utilize wind energy, thereby improving wind energy utilization efficiency.

[0008] Furthermore, the first-stage turbine and the second-stage turbine of this invention share a single rotating shaft, realizing a coaxial dual-rotor design. This allows the first-stage turbine to rotate under the airflow, thereby driving the rotating shaft to rotate. The rotation of the rotating shaft then drives the second-stage turbine to rotate. With both the first-stage and second-stage turbines rotating, the rotating shaft can rotate rapidly, effectively improving wind energy utilization. This avoids the problem of low wind energy utilization caused by the independent setting of the front and rear impellers in the prior art.

[0009] In summary, this invention improves the wind energy utilization rate by using a blade-type rotating structure and a duct to drive the rear turbine fan to rotate.

[0010] The ducted twin-turbocharged wind turbine of the present invention is suitable for outdoor locations such as islands, border outposts, building rooftops, and wind farms, and its power generation efficiency is superior to that of existing technologies, especially in outdoor locations with low wind speeds.

[0011] In a preferred embodiment, the ratio of the inlet diameter to the outlet diameter of the duct is (1.5-1.8):1.

[0012] The aforementioned diameter ratio setting can effectively improve wind energy utilization.

[0013] In a preferred embodiment, the rotating shaft includes a first shaft and a second shaft, which are connected by a clutch coupling; a first-stage turbine and a second-stage turbine are respectively mounted on the first shaft and the second shaft.

[0014] This invention optimizes the rotating shaft by connecting two short shafts (the first shaft and the second shaft) to form a long shaft via a clutch-type coupling. This achieves the following advantage: under low wind speed conditions, the first-stage turbine facing the air inlet can rotate first, while the rotational load is small (the other turbine (the second-stage turbine) is not started). When the speed of the first-stage turbine increases, it can drive the second-stage turbine to rotate. Through this setting, different speeds of the two turbines can be achieved to maximize conversion efficiency.

[0015] In a preferred embodiment, the first-stage turbine includes a first hub and a first blade disposed on the first hub; The outer wall of the shaft is provided with a first annular groove for embedding into the first hub, and the outer wall of the shaft is provided with a second annular groove inside the first annular groove. The ducted twin-turbocharged wind turbine also includes fasteners that are embedded in a second annular groove and detachably connected to the first hub. The fastener is arranged along the axial direction of the shaft, and the portion of the fastener protruding from the shaft is located on the windward side of the first hub.

[0016] The first and second stage turbines are more susceptible to damage than other components, especially the first stage turbine located at the front of the airflow. If the airflow contains impurities such as sand and gravel, it is more likely to be damaged. Therefore, damaged turbines need to be replaced in a timely manner.

[0017] This invention utilizes a locking component to achieve a detachable connection between the primary turbine and the shaft. The aforementioned structure not only enables a detachable connection between the primary turbine and the shaft but also allows for quick installation and disassembly, thereby reducing downtime during turbine replacement.

[0018] Furthermore, the arrangement of the fasteners in this invention has lower wind resistance compared to the traditional radial bolt arrangement of wheel hubs. At the same time, the part of the fastener protruding from the shaft is located on the windward side of the first wheel hub. Under the action of airflow, the fastener can be more firmly embedded in the second annular groove, which helps to improve the stability of the fastener fixed in the second annular groove.

[0019] In a preferred embodiment, the fastener is a split conical sleeve; The split cone sleeve includes at least two clamping plates. The circumferential width of the clamping plates gradually increases from one end inserted into the bottom of the second annular groove to the other end. The end with the larger circumferential width of the clamping plate extends radially outward to form a connecting plate. The connecting plate is connected to the first hub by bolts. The clamping plate and the second annular groove are interference fit.

[0020] The split cone sleeve of this invention can be more firmly embedded in the second annular groove under the action of airflow.

[0021] In a preferred embodiment, the radial thickness of the card plate gradually increases from one end inserted into the bottom of the second annular groove to the other end.

[0022] The circumferential width and radial thickness of the card plate of the present invention are both gradually changing, which facilitates quick and firm embedding into the second annular groove under the action of external force and airflow.

[0023] In a preferred embodiment, an axial hole is formed inside the shaft, with the axial hole having a closed end near the windward side and an open end at the other end; a first radial through groove is provided on the outer wall of the shaft, penetrating the first annular groove and the second annular groove. A central tie rod is provided inside the axial hole; the outer wall of the central tie rod is provided with a protrusion that mates with the first radial through groove; the circumferential width of the protrusion and the circumferential width of the clamping plate have the same trend, the protrusion and the clamping plate are arranged at intervals in the circumferential direction, and the protrusion can squeeze the clamping plate in the circumferential direction.

[0024] In this invention, multiple protrusions and the retaining plates of the split conical sleeve are spaced apart and cooperate with each other. That is, by pulling the central pull rod, the protrusions can be inserted between two adjacent retaining plates. The central pull rod maintains a continuous pulling force, and the protrusions generate circumferential extrusion force on the retaining plates to improve the stability of the retaining plates fixed to the outer wall of the rotating shaft. This ensures that the first-stage turbine is stably fixed in the first annular groove on the outer wall of the rotating shaft. At the same time, bolts are used for fixation to avoid relative movement between the first-stage turbine and the rotating shaft, thus achieving the tight installation of the first-stage turbine. Conversely, by retracting the central pull rod and releasing the bolts, the first-stage turbine can be disassembled.

[0025] The second-stage turbine of this invention can also be fixed in the same way as the first-stage turbine.

[0026] In a preferred embodiment, the central tie rod includes a first tie rod and a second tie rod. A protrusion is disposed on the outer wall of the first tie rod, and a circumferential limiting member is disposed between the first tie rod and the axial hole. One end of the second tie rod is rotatably connected to the first tie rod, and the second tie rod can be axially displaced independently by rotation. The other end is connected to a telescopic member, and the telescopic member is rotated by a drive mechanism. The rotating shaft includes a first shaft and a second shaft, which are connected by a clutch coupling. An adjustable guide shield is provided at the connection between the second contraction section and the second straight section. The adjustable guide shield includes a fixed shield and a sliding shield. One end of the fixed shield is fixed to the clutch coupling, and the other end is an open end. One end of the sliding shield is slidably connected to the second shaft, and the other end is slidably connected to the fixed shield. The second shaft is provided with a second radial through groove, and the outer wall of the second tie rod is provided with a limit block. The limit block passes through the second radial through groove and is connected to the sliding cover.

[0027] The central tie rod provided in this invention enables the first tie rod and the second tie rod to move axially synchronously under axial tension, so as to limit or release the protrusion on the plate. Furthermore, by rotating the second tie rod, the second tie rod can move axially independently, thereby driving the adjustable guide shield to move axially, while the first tie rod will not move axially.

[0028] This invention features an adjustable fairing between the first contraction section and the second straight section of the duct. By rotating the second tie rod, the fairing can move linearly along the axis of rotation. Specifically, when the adjustable fairing moves forward (closer to the oncoming airflow) and forms a convergent shape, a low-pressure zone (or acceleration zone) can be generated at the inlet, enhancing intake / local acceleration; moving it backward reduces induction and weakens the acceleration effect. Furthermore, the adjustment structure is simple and requires no excessive structural components. Ultimately, it ensures that the airflow before the second-stage turbine contacts the second-stage turbine in the optimal manner, maximizing wind energy recovery.

[0029] In a preferred embodiment, the circumferential limiting member includes a limiting strip disposed on the outer wall of the first tie rod, and a strip-shaped groove for engaging the limiting strip is disposed on the inner wall of the axial hole. The length direction of the strip-shaped groove is the axial direction of the rotating shaft, and the limiting strip and the strip-shaped groove have the same circumferential width.

[0030] The locking mechanism described above enables the second tie rod to undergo axial displacement during rotation while the first tie rod does not.

[0031] In a preferred embodiment, the first and second pull rods are connected by a threaded connection.

[0032] In a preferred embodiment, the drive mechanism includes a gear pair disposed on the telescopic member, and the telescopic member is connected to the motor via the gear pair.

[0033] The present invention achieves axial displacement of the central tie rod as a whole by extending and retracting the telescopic component, and achieves independent axial displacement of the second tie rod by driving the rotation of the second tie rod through the driving mechanism.

[0034] In a preferred embodiment, the outer wall of the telescopic component is provided with a limiting groove, and the inner wall of the gear pair is provided with a limiting protrusion that mates with the limiting groove. This arrangement improves the stability of the connection between the gear pair and the telescopic component.

[0035] In a preferred embodiment, the adjustable fairing is generally conical, with the outer wall of the sliding fairing slidably connected to the inner wall of the fixed fairing.

[0036] The adjustable fairing described above has low wind resistance, reducing the impact of the adjustable fairing on wind energy utilization.

[0037] In a preferred embodiment, the radial width of the first hub gradually increases from the windward side to the other side.

[0038] In a preferred embodiment, a protective cover is also included; the protective cover is detachably connected to the first hub and the pivot; the first hub, fasteners, first annular groove and second annular groove are disposed inside the protective cover; the outer wall of the protective cover is a smooth curved surface.

[0039] The outer wall of the protective cover in this invention is a smooth curved surface, which has low wind resistance and can reduce the impact of the first hub, fasteners, and second annular groove on wind energy utilization.

[0040] In a preferred embodiment, the shaft is connected to the inner wall of the duct via a bracket; the bracket includes a support bracket and an airfoil bracket. An airfoil bracket is preferred, as it references the streamlined design of a wind turbine's airfoil and, compared to other bracket structures, exhibits lower wind resistance, thus improving wind energy utilization and enabling operation at low wind speeds.

[0041] In a preferred embodiment, the airfoil-shaped support is mounted at the rear end of the first-stage turbine to avoid the impact of the mounted support on the first-stage turbine.

[0042] In a preferred embodiment, a rectifier is provided at the front end of the first-stage turbine and / or the rear end of the second-stage turbine. The rectifier can stabilize the airflow direction entering and exiting the duct, which is more conducive to the rapid start-up of the first-stage and second-stage turbines.

[0043] In a preferred embodiment, the duct is mounted and secured by a base.

[0044] In a preferred embodiment, the transmission structure includes a bevel gear.

[0045] Compared with the prior art, the present invention has the following advantages and beneficial effects: 1. The ducted twin-turbocharged wind turbine of the present invention utilizes a coaxial dual-rotor design to convert wind energy into mechanical energy, and then the generator converts the mechanical energy into electrical energy. On the one hand, the present invention uses a single shaft for the first and second stage turbines, enabling the front-end turbine fan to drive the rear-end turbine fan, thereby improving wind energy utilization. On the other hand, the duct is designed as a double-curvature guide wall, which enables the airflow to be accelerated twice within the duct. This allows the ducted twin-turbocharged wind turbine to start even at low wind speeds, further improving wind energy utilization. In other words, the ducted twin-turbocharged wind turbine of the present invention has the advantage of high wind energy utilization.

[0046] 2. By setting up mutually cooperating split cone sleeves and central tie rods, this invention can not only achieve quick installation and disassembly of the first-stage turbine, but also ensure good connection stability between the first-stage turbine and the shaft.

[0047] 3. This invention improves the rotating shaft by designing it as a first shaft and a second shaft connected by a clutch coupling, which enables the first-stage turbine and the second-stage turbine to rotate at low wind speeds, thereby maximizing conversion efficiency.

[0048] 4. By setting an adjustable guide fairing, the axial length of the adjustable guide fairing can be adjusted according to the wind speed in the duct, so that the airflow enters the second stage turbine in a better state. Attached Figure Description

[0049] The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and form part of this application, do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the structure of the ducted twin-turbocharged wind turbine of the present invention; Figure 2 This is a cross-sectional view of the ducted twin-turbocharged wind turbine in Embodiment 1 of the present invention; Figure 3 This is a cross-sectional view of the ducted twin-turbocharged wind turbine in Embodiment 4 of the present invention; Figure 4 for Figure 3 A magnified view of a section at point A in the middle; Figure 5 for Figure 3 A magnified view of a section at point B in the middle; Figure 6 This is a cross-sectional view of the rotating shaft in Embodiment 4 of the present invention; Figure 7 This is a schematic diagram of the engagement between the shaft and the central tie rod in Embodiment 4 of the present invention; Figure 8 This is a schematic diagram of the split conical sleeve in Embodiment 4 of the present invention; Figure 9 This is a schematic diagram of the structure of the first wheel hub in Embodiment 4 of the present invention; Figure 10 This is a schematic diagram of the semi-circular card component in Embodiment 4 of the present invention; Figure 11 This is a schematic diagram of the ducted twin-turbocharged wind turbine in Embodiment 4 of the present invention.

[0050] The attached diagram shows the markings and corresponding component names: 1-Ductwork; 2-Shaft; 3-First-stage turbine; 4-Second-stage turbine; 5-Rectifier; 6-Center tie rod; 7-Split cone sleeve; 8-Adjustable fairing; 9-Telescopic component; 10-Gear pair; 11-First contraction segment; 12-First straight segment; 13-Second contraction segment; 14-Second straight segment; 21-Axial hole; 22-First annular groove; 23-Second annular groove; 24-First radial through groove; 25-Second radial through groove; 26-Protective cover; 27-Clutch coupling; 31-First hub; 32-First blade; 311-Semi-circular clip; 312-Positioning hole; 61-Bump; 62-Limiting block; 71-Clamping plate; 72-Connecting plate; 73-Bolt; 721-Through hole; 81-Fixed cover; 82-Sliding cover; 91-Limiting groove; 100 - Base; 200 - Generator; 300 - Straight bevel gear; 400 - Support bracket; 500 - Airfoil bracket. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. The illustrative embodiments and descriptions of this invention are for illustrative purposes only and are not intended to limit the invention. The embodiments described below are some, but not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0052] In the following description, numerous specific details are set forth to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that these specific details are not necessary to practice the invention. In other embodiments, well-known structures, materials, or methods are not specifically described to avoid obscuring the invention. Unless otherwise specified, the materials, instruments, and reagents used in the following embodiments are commercially available. Unless otherwise specified, the techniques used in the embodiments are conventional methods well known to those skilled in the art.

[0053] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0054] Example 1: like Figure 1 , Figure 2As shown, the ducted twin-turbocharged wind turbine includes a duct 1 and a blade-type rotating structure disposed within the duct 1. The duct 1 is mounted on a base 100. Along the airflow direction, the duct 1 sequentially includes a first contraction section 11, a first straight section 12, a second contraction section 13, and a second straight section 14. The first contraction section 11, the first straight section 12, the second contraction section 13, and the second straight section 14 have the same thickness. The diameter of the first straight section 12 is larger than the diameter of the second straight section 14. Preferably, the ratio of the inlet diameter to the outlet diameter of the duct 1 is 1.5-1.8:1. The diameters of both the first contraction section 11 and the second contraction section 13 gradually decrease from the front end to the rear end of the airflow. The blade-type rotating structure includes a shaft 2 and a first-stage turbine 3 and a second-stage turbine 4 mounted on the shaft 2. The first-stage turbine 3 and the second-stage turbine 4 are respectively located on a first straight section 12 and a second straight section 14. Specifically, in this embodiment, the second-stage turbine 4 is located at the front end of the second straight section 14. The shaft 2 is connected to the generator 200 through a transmission structure. The first-stage turbine 3 includes a first hub 31 and a first blade 32 mounted on the first hub 31. The second-stage turbine 4 has the same structure as the first-stage turbine 3.

[0055] In this embodiment, the rotating shaft 2 is fixed inside the duct 1 by a support bracket 400. The support bracket 400 includes a support frame and a bearing located at the top of the support frame. The bottom of the support frame is fixed to the inner wall of the duct 1, and the rotating shaft 2 is rotatably disposed inside the bearing.

[0056] In this embodiment, the transmission structure is a bevel gear 300, which is located at the tail end of the rotating shaft 2. The generator 200 is located below the bevel gear 300 inside the duct 1. The bevel gear 300 is composed of two meshing bevel gears, one of which is fixed at the tail end of the rotating shaft 2, and the other bevel gear is connected to the generator 200 through a shaft.

[0057] In a preferred embodiment, a rectifier 5 is provided at the front end of the first-stage turbine 3 and / or at the rear end of the second-stage turbine 4.

[0058] The working principle of this embodiment is as follows: The airflow first enters the first-stage turbine 3 for a first acceleration and then enters the first straight section 12, causing the first-stage turbine 3 to rotate. The rotation of the first-stage turbine 3 drives the shaft 2 to rotate, and the rotation of the shaft 2 drives the second-stage turbine 4 to rotate. At the same time, the airflow passes through the second contraction section 13 for a second acceleration and then enters the second straight section 14, causing the second-stage turbine 4 to accelerate. That is, the second-stage turbine 4 rotates under the action of the shaft and the airflow. The rotation of the shaft 2 is accelerated by the joint rotation of the first-stage turbine 3 and the second-stage turbine 4, which converts the wind energy in the duct into mechanical energy as much as possible. Then, the mechanical energy is converted into electrical energy by the generator 200.

[0059] In this embodiment, on the one hand, the first-stage turbine 3 and the second-stage turbine 4 share a single rotating shaft 2, enabling the turbine fan at the front end, i.e., the first-stage turbine 3, to drive the turbine fan at the rear end, i.e., the second-stage turbine 4, thus improving the wind energy utilization rate; on the other hand, the duct 1 is set as a double-curvature guide wall, which enables the airflow to be accelerated twice within the duct 1, allowing the ducted dual-turbocharged wind turbine to start even at low wind speeds, and further improving the wind energy utilization rate.

[0060] Example 2: like Figure 3 As shown, this embodiment is based on embodiment 1, but differs from embodiment 1 in that the bracket used to fix the rotating shaft 2 is different. In this embodiment, an airfoil bracket 500 is used to install the rotating shaft 2 inside the duct 1. The specific shape of the airfoil bracket 500 is designed with reference to the wing of an aircraft, which has a smaller wind resistance. Specifically, in this embodiment, a bearing can be set on the rotating shaft 2, and an airfoil fixing plate can be set on both sides of the rotating shaft 2 on the outer wall of the bearing. One end of the airfoil fixing plate is connected to the bearing, and the other end is connected to the inner wall of the duct 1. Preferably, the airfoil bracket 500 is installed at the rear end of the first-stage turbine 3.

[0061] Compared with the support bracket 400 in Embodiment 1, the airfoil-shaped bracket 500 of this embodiment has lower wind resistance, which is beneficial to improving wind energy utilization.

[0062] In a preferred embodiment, to further reduce wind resistance within duct 1, the bevel gear 300 and generator 200 are positioned outside duct 1, such as... Figure 11 As shown, in this embodiment, the tail end of the rotating shaft 2 protrudes from the duct 1, and the straight bevel gear 300 is installed on the part of the rotating shaft 2 that protrudes from the duct 1. The generator 200 can be installed on the base 100, or a mounting bracket for installing the generator 200 can be provided on the outer wall of the tail end of the duct 1. The specific installation position of the generator 200 is not shown in the diagram.

[0063] Example 3: like Figure 3 , Figure 11 As shown, this embodiment is based on embodiment 1 or embodiment 2. This embodiment further improves the rotating shaft 2. In this embodiment, the rotating shaft 2 includes a first shaft and a second shaft, which are connected by a clutch coupling 27; the first-stage turbine 3 and the second-stage turbine 4 are respectively installed on the first shaft and the second shaft.

[0064] In this embodiment, the first shaft and the second shaft are connected by a clutch coupling 27 to form a rotating shaft 2. Under low wind speed conditions, the first-stage turbine 3 facing the air inlet can rotate first because the second-stage turbine 4 has not started at this time, so the load on the first-stage turbine 3 is small. When the speed of the first-stage turbine 3 increases, it can drive the second-stage turbine 4 to rotate. Through this setting, different speeds of the two turbines can be achieved to maximize the conversion efficiency.

[0065] Example 4: like Figures 3-4 , Figures 6-11 As shown, this embodiment is based on any one of Embodiments 1-3. In this embodiment, considering the losses of the first-stage turbine 3 and the second-stage turbine 4, the first-stage turbine 3 and the second-stage turbine 4 are configured to be detachably connected to the shaft 2.

[0066] Furthermore, in this embodiment, in order to avoid the traditional detachable connection being achieved by installing bolts in the radial direction of the hub, but installing bolts in the radial direction is equivalent to increasing the radial area of ​​the hub, which will cause the hub to generate greater wind resistance, which is not conducive to improving wind energy utilization.

[0067] In this embodiment, this is achieved through axially arranged locking elements and bolts 73, thereby reducing wind resistance caused by the detachable connection between the first-stage turbine 3 and the second-stage turbine 4. Specifically, in this embodiment, the outer wall of the rotating shaft 2 is provided with a first annular groove 22 for embedding into the first hub 31, and the outer wall of the rotating shaft 2 is provided with a second annular groove 23 inside the first annular groove 22. The specific shape of the second annular groove 23 is adapted to the inserted locking element. The ducted twin-turbocharged wind turbine also includes fasteners for detachably connecting the first-stage turbine 3 and the shaft 2. The fasteners are embedded in the second annular groove 23 and detachably connected to the first hub 31. The fasteners are arranged along the axial direction of the shaft 2, and the part of the fasteners protruding from the shaft 2 is located on the windward side of the first hub 31, so as to ensure that the locking member is firmly inserted into the second annular groove 23 by the airflow pressure in the duct 1, thereby improving the stability of the connection between the first-stage turbine 3 and the shaft 2.

[0068] Specifically, in this embodiment, the fastener is a split conical sleeve 7; the split conical sleeve 7 includes at least two retaining plates 71, the circumferential width of the retaining plates 71 gradually increases from one end inserted into the bottom of the second annular groove 23 to the other end, preferably, the radial thickness of the retaining plates 71 gradually increases from one end inserted into the bottom of the second annular groove 23 to the other end, the end of the retaining plate 71 with the larger circumferential width extends radially outward to form a connecting plate 72, the connecting plate 72 is connected to the first hub 31 by bolts 73, specifically, the connecting plate 72 is provided with a through hole 721; the first hub 31 is composed of two mutually interlocking semi-circular retaining pieces 311, such as Figure 9 , Figure 10As shown, the two semi-circular clips 311 are interlocked in a stepped manner, forming a ring. A positioning hole 312 is provided on the semi-circular clip 311, which corresponds to the through hole 721. After the bolt 73 passes through the through hole 721 and is fixed to the positioning hole 312, the clamping plate 71 and the second annular groove 23 are interference fit, which realizes the detachable fixing of the first-stage turbine 3 to the rotating shaft 2 by the locking member. The second-stage turbine 4 can adopt the same fixing method as the first-stage turbine 3.

[0069] In a preferred embodiment, the ducted twin-turbocharged wind turbine of this embodiment further includes a protective cover 26; the protective cover 26 is detachably connected to the first hub 31 and the shaft 2, specifically by means of a combination of protrusions and grooves; the first hub 31, fasteners, the first annular groove 22, and the second annular groove 23 are disposed within the protective cover 26; the outer wall of the protective cover 26 is a smooth curved surface. The smooth curved surface of the outer wall of the protective cover 26 has lower wind resistance, which can reduce the impact of the first hub 31, fasteners, and the second annular groove 23 on wind energy utilization.

[0070] Example 5: like Figures 3-4 , Figures 6-11 As shown, this embodiment is based on embodiment 4. To further improve the fixing stability of the split cone sleeve 7 on the rotating shaft 2, the structure of the rotating shaft 2 is further improved, and a central tie rod 6 is added to cooperate with the clamping plate 71 of the split cone sleeve 7, generating circumferential compressive force on the clamping plate 71, thereby improving the stability of the split cone sleeve 7 after installation. Specifically, an axial hole 21 is formed inside the rotating shaft 2, with a closed end near the windward side and an open end at the other end; a first radial through groove 24 is provided on the outer wall of the rotating shaft 2, penetrating the first annular groove 22 and the second annular groove 23. A central tie rod 6 is provided inside the axial hole 21. The central tie rod 6 can be axially displaced within the axial hole 21 under the action of external force. Specifically, a telescopic component 9 can be connected to the tail end of the central tie rod 6. The telescopic component 9 can be any existing technology capable of axial extension and retraction, such as a cylinder, hydraulic cylinder, electric telescopic rod, etc. The extension and retraction of the telescopic component 9 drives the central tie rod 6 to perform axial displacement. The outer wall of the central tie rod 6 is provided with a protrusion 61 that mates with the first radial through groove 24. The circumferential width and radial thickness of the protrusion 61 have the same trend as the circumferential width and radial thickness of the clamping plate 71. The protrusion 61 and the clamping plate 71 are arranged at intervals in the circumferential direction, and the protrusion 61 can compress the clamping plate 71 in the circumferential direction.

[0071] In a preferred embodiment, the radial width of the first hub 31 gradually increases from the windward side to the other side, that is, the inner side of the first hub 31 forms a conical surface. At this time, the radial width of the first annular groove 22 also gradually increases from the front end to the rear end of the airflow.

[0072] The working principle of this embodiment is as follows: When the first-stage turbine 3 needs to be installed, the two semi-circular clips 311 of the first hub 31 are placed in the first annular groove 22 and fastened to form a ring. Then, the clip plate 71 of the split cone sleeve 7 is inserted into the second annular groove 23 for interference fit. The clip plate 71 and the first hub 31 are then connected by bolts 73. The central tie rod 6 is then pulled along the rear end of the airflow direction to insert the protrusion 61 between two adjacent clip plates 71. The central tie rod 6 maintains tension, and the protrusion 61 generates circumferential extrusion force on the clip plate 71 to improve the stability of the clip plate 71 fixed to the outer wall of the shaft 2. This ensures that the first-stage turbine 3 is stably fixed in the first annular groove 22 on the outer wall of the shaft 2, so as to avoid relative movement between the first-stage turbine 3 and the shaft 2, thus achieving the tight installation of the first-stage turbine 3. Conversely, the first-stage turbine 3 can be disassembled by retracting the central tie rod 6 and releasing the bolts 73.

[0073] Example 6: like Figures 3-11 As shown, this embodiment is based on embodiment 5. The central tie rod 6 includes a first tie rod and a second tie rod. A protrusion 61 is disposed on the outer wall of the first tie rod. A circumferential limiting member is disposed between the first tie rod and the axial hole 21. Specifically, the circumferential limiting member includes a limiting strip disposed on the outer wall of the first tie rod. A strip-shaped groove for inserting the limiting strip is disposed on the inner wall of the axial hole 21. The length direction of the strip-shaped groove is the axial direction of the rotating shaft 2. The limiting strip and the strip-shaped groove have the same circumferential width. In this embodiment, the circumferential displacement of the first tie rod is restricted by the circumferential limiting member, so that the first tie rod can only perform axial displacement. One end of the second tie rod is rotatably connected to the first tie rod. Specifically, the first tie rod and the second tie rod are connected by a thread. The second tie rod can perform axial displacement independently by rotation. Since the first tie rod cannot rotate, when the second tie rod rotates, the second tie rod can perform axial displacement. The other end is connected to the telescopic member 9. The telescopic member 9 is rotated by a driving mechanism.

[0074] The rotating shaft 2 includes a first shaft and a second shaft, which are connected by a clutch coupling 27. Specifically, the drive mechanism includes a gear pair 10, which is mounted on the telescopic member 9. The telescopic member 9 is connected to the motor via the gear pair 10. More specifically, the gear pair 10 includes a driving wheel and a driven wheel that mesh with each other. The driving wheel is connected to the power output shaft of the motor, and the driven wheel is fixed to the outer wall of the fixed end of the telescopic member 9. Preferably, the outer wall of the telescopic member 9 is provided with a limiting groove 91, and the inner wall of the driven wheel is provided with a limiting protrusion that matches the limiting groove 91. The cooperation between the limiting protrusion and the limiting groove 91 improves the stability of the connection between the gear pair 10 and the telescopic member 9.

[0075] An adjustable flow guide shroud 8 is provided at the connection between the second contraction section 13 and the second straight section 14. The adjustable flow guide shroud 8 includes a fixed shroud 81 and a sliding shroud 82. One end of the fixed shroud 81 is fixed to the clutch coupling 27, and the other end is an open end. One end of the sliding shroud 82 is slidably connected to the second shaft, and the other end is slidably connected to the fixed shroud 81. The second shaft is provided with a second radial through groove 25, and the outer wall of the second tie rod is provided with a limit block 62. The limit block 62 passes through the second radial through groove 25 and is connected to the sliding cover 82.

[0076] In a preferred embodiment, the adjustable fairing 8 is generally conical, meaning that the diameter of the adjustable fairing 8 gradually increases from the front end to the rear end of the airflow. The outer wall of the sliding fairing 82 is slidably connected to the inner wall of the fixed fairing 81. Compared to the sliding fairing 82 being slidably connected to the outer wall of the fixed fairing 81, the former has a smaller wind resistance surface, and thus has less wind resistance.

[0077] The working principle of this embodiment is as follows: In this embodiment, the adjustable guide shroud 8 can move linearly along the axis of the rotating shaft 2 by rotating the second pull rod. Specifically, when acceleration is required, moving the adjustable guide shroud 8 closer to the front end of the airflow can create a low-pressure zone at the inlet, enhancing the intake / local acceleration; conversely, moving the adjustable guide shroud 8 closer to the rear end of the airflow reduces the induction and weakens the acceleration effect. The direction of movement of the adjustable guide shroud 8 is determined according to the wind speed in the test duct 1. If the wind speed in the duct 1 is too low, acceleration is required, and vice versa. Ultimately, this ensures that the airflow in front of the second-stage turbine 4 contacts the second-stage turbine 4 in the best way, maximizing wind energy recovery.

[0078] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0079] It should be noted that the structures, proportions, sizes, etc., illustrated in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of the invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the disclosed technical content. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

Claims

1. A ducted twin-turbocharged wind turbine, comprising a duct (1) and a blade-type rotating structure disposed within the duct (1); characterized in that, The culvert (1) includes, along the airflow direction, a first contraction section (11), a first straight section (12), a second contraction section (13), and a second straight section (14), wherein the diameter of the first straight section (12) is larger than the diameter of the second straight section (14); The blade-type rotating structure includes a rotating shaft (2) and a first-stage turbine (3) and a second-stage turbine (4) disposed on the rotating shaft (2). The first-stage turbine (3) and the second-stage turbine (4) are respectively disposed on the first straight section (12) and the second straight section (14). The rotating shaft (2) is connected to the generator (200) through a transmission structure.

2. The ducted twin-turbocharged wind turbine according to claim 1, characterized in that, The ratio of the inlet diameter to the outlet diameter of the culvert (1) is (1.5-1.8):

1.

3. The ducted twin-turbocharged wind turbine according to claim 1, characterized in that, The rotating shaft (2) includes a first shaft and a second shaft, which are connected by a clutch coupling (27); the first-stage turbine (3) and the second-stage turbine (4) are respectively mounted on the first shaft and the second shaft.

4. The ducted twin-turbocharged wind turbine according to claim 1, characterized in that, The first-stage turbine (3) includes a first hub (31) and a first blade (32) disposed on the first hub (31). The outer wall of the shaft (2) is provided with a first annular groove (22) for embedding the first hub (31), and the outer wall of the shaft (2) is provided with a second annular groove (23) inside the first annular groove (22). The ducted twin-turbocharged wind turbine also includes fasteners, which are embedded in the second annular groove (23) and detachably connected to the first hub (31). The fastener is arranged along the axial direction of the shaft (2), and the portion of the fastener protruding from the shaft (2) is arranged on the windward side of the first hub (31).

5. The ducted twin-turbocharged wind turbine according to claim 4, characterized in that, The fastener is a split conical sleeve (7). The split cone sleeve (7) includes at least two retaining plates (71). The circumferential width of the retaining plate (71) gradually increases from one end inserted into the bottom of the second annular groove (23) to the other end. The end of the retaining plate (71) with a larger circumferential width extends radially outward to form a connecting plate (72). The connecting plate (72) is connected to the first hub (31) by bolts (73). The retaining plate (71) and the second annular groove (23) are interference fit.

6. The ducted twin-turbocharged wind turbine according to claim 5, characterized in that, The radial thickness of the card plate (71) gradually increases from one end inserted into the bottom of the second annular groove (23) to the other end.

7. The ducted twin-turbocharged wind turbine according to claim 5, characterized in that, An axial hole (21) is formed inside the rotating shaft (2). The axial hole (21) is closed on the windward side and open on the other side. A first radial through groove (24) is provided on the outer wall of the rotating shaft (2) through the first annular groove (22) and the second annular groove (23). A central tie rod (6) is provided inside the axial hole (21); the outer wall of the central tie rod (6) is provided with a protrusion (61) that cooperates with the first radial through groove (24); the circumferential width of the protrusion (61) has the same trend as the circumferential width of the clamping plate (71), the protrusion (61) and the clamping plate (71) are arranged at intervals in the circumferential direction, and the protrusion (61) can squeeze the clamping plate (71) in the circumferential direction.

8. The ducted twin-turbocharged wind turbine according to claim 7, characterized in that, The central tie rod (6) includes a first tie rod and a second tie rod. The protrusion (61) is disposed on the outer wall of the first tie rod. A circumferential limiting member is disposed between the first tie rod and the axial hole (21). One end of the second tie rod is rotatably connected to the first tie rod, and the second tie rod can be axially displaced independently by rotation. The other end is connected to the telescopic member (9), and the telescopic member (9) is rotated by a driving mechanism. The rotating shaft (2) includes a first shaft and a second shaft, which are connected by a clutch coupling (27); An adjustable flow guide (8) is provided at the connection between the second contraction section (13) and the second straight section (14). The adjustable flow guide (8) includes a fixed cover (81) and a sliding cover (82). One end of the fixed cover (81) is fixed to the clutch coupling (27), and the other end is an open end. One end of the sliding cover (82) is slidably connected to the second shaft, and the other end is slidably connected to the fixed cover (81). The second shaft is provided with a second radial through groove (25), and the outer wall of the second tie rod is provided with a limiting block (62). The limiting block (62) passes through the second radial through groove (25) and is connected to the sliding cover (82).

9. The ducted twin-turbocharged wind turbine according to claim 8, characterized in that, The circumferential limiting component includes a limiting strip disposed on the outer wall of the first pull rod. The inner wall of the axial hole (21) is provided with a strip-shaped groove for inserting the limiting strip. The length direction of the strip-shaped groove is the axial direction of the rotating shaft (2). The limiting strip and the strip-shaped groove have the same circumferential width.

10. The ducted twin-turbocharged wind turbine according to claim 8, characterized in that, The first and second pull rods are connected by threads.

11. The ducted twin-turbocharged wind turbine according to claim 8, characterized in that, The drive mechanism includes a gear pair (10), which is disposed on the telescopic member (9), and the telescopic member (9) is connected to the motor through the gear pair (10).

12. The ducted twin-turbocharged wind turbine according to claim 11, characterized in that, The outer wall of the telescopic component (9) is provided with a limiting groove (91), and the inner wall of the gear pair (10) is provided with a limiting protrusion that cooperates with the limiting groove (91).

13. The ducted twin-turbocharged wind turbine according to claim 8, characterized in that, The adjustable flow guide (8) is generally conical, and the outer wall of the sliding cover (82) is slidably connected to the inner wall of the fixed cover (81).

14. The ducted twin-turbocharged wind turbine according to claim 4, characterized in that, The radial width of the first hub (31) gradually increases from the windward side to the other side.

15. The ducted twin-turbocharged wind turbine according to claim 4, characterized in that, It also includes a protective cover (26); the protective cover (26) is detachably connected to the first hub (31) and the shaft (2); the first hub (31), the fastener, the first annular groove (22) and the second annular groove (23) are disposed inside the protective cover (26); the outer wall of the protective cover (26) is a smooth curved surface.

16. The ducted twin-turbocharged wind turbine according to any one of claims 1-15, characterized in that, The rotating shaft (2) is connected to the inner wall of the duct (1) via a bracket; the bracket includes a support bracket (400) and an airfoil bracket (500).

17. The ducted twin-turbocharged wind turbine according to claim 16, characterized in that, The airfoil bracket (500) is installed at the rear end of the first-stage turbine (3).

18. The ducted twin-turbocharged wind turbine according to any one of claims 1-15, characterized in that, A rectifier (5) is provided at the front end of the first-stage turbine (3) and / or at the rear end of the second-stage turbine (4).

19. The ducted twin-turbocharged wind turbine according to any one of claims 1-15, characterized in that, The culvert (1) is installed and fixed by the base (100).

20. The ducted twin-turbocharged wind turbine according to any one of claims 1-15, characterized in that, The transmission structure includes a straight bevel gear (300).

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