A horizontal axis wind turbine with a flow limiter and a stepped multi-blade siphon type

Abstract

The application discloses a kind of with flow-limiting cover hierarchical multi-blade siphon type horizontal axis wind-driven generator, it is related to the technical field of low wind speed wind power generation, solve the low wind power generator wind energy capture efficiency, starting wind speed is high, low wind speed operating condition poor adaptability and other problems, including: four groups of wind power generation device, each wind power generation device includes: coaxial flow-limiting cover and ladder spindle, three levels staggered blade groups are installed in the middle of ladder spindle;Ladder spindle is rotatably installed in the front end in guide cone, the rear end of ladder spindle is drivingly connected with the driving end of generator, guide cone guides the central airflow close to rotating shaft to blade area, flow-limiting cover restricts airflow to prevent radial escape, three levels staggered blades realize wind energy hierarchical capture, whole machine uses four groups of array arrangement to improve output power, by airflow guiding, restriction, hierarchical capture and array cooperation, significantly improve the power generation efficiency under low wind speed, it is applicable to remote areas, island, rural and other distributed off-grid power supply scenarios.

Description

Technical Field

[0001] This invention relates to the technical field of low-wind-speed wind power generation, and in particular to a multi-bladed, staged siphon-type horizontal axis wind turbine with a flow-limiting shroud. Background Technology

[0002] With the global energy structure transformation and the advancement of "dual carbon" goals, wind energy, as a clean and renewable energy source, is being widely used. Among them, small low-wind-speed horizontal-axis wind turbines have significant application value in mountainous areas, islands, pastoral areas, rural areas, and remote areas without grid coverage due to their advantages such as flexible installation, small footprint, and adaptability to weak wind areas. However, current traditional small horizontal-axis wind turbines generally suffer from several technical bottlenecks under low-wind-speed conditions. These include low wind energy capture efficiency, high starting wind speed, large aerodynamic interference, insufficient structural reliability, and poor adaptability to low-wind-speed conditions, which seriously restrict their promotion and use. Summary of the Invention

[0003] In response to the problems of low wind energy capture efficiency, high starting wind speed, large aerodynamic interference, insufficient structural reliability, and poor adaptability to low wind speed conditions in existing small low wind speed wind turbines, the present invention aims to provide a multi-bladed siphon-type horizontal axis wind turbine with a flow-limiting shroud, which is particularly suitable for distributed power generation scenarios in low wind speed and weak wind areas.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A multi-bladed siphon-type horizontal axis wind turbine with a flow-limiting shroud includes: four sets of identical wind power generation devices, which are placed on a horizontal ground at the four corners of a parallelogram.

[0006] Each wind power generation unit includes: a column 1, a guide cone 2, a flow restrictor 3, a stepped main shaft 4, a support frame 5, a three-stage staggered blade assembly, and a generator 10. The column 1 is vertically installed, the stepped main shaft 4 is horizontally installed, the flow restrictor 3 is a cylindrical structure of equal diameter, and the flow restrictor 3 and the stepped main shaft 4 are coaxially installed. The front end of the flow restrictor 3 is rotatably mounted on the top of the column 1, and the rear outer wall of the flow restrictor 3 is provided with an expanded outflow structure. The guide cone 2 is located inside the flow restrictor 3 and is rotatably mounted on the column 1, with the conical tip of the guide cone 2 facing the front of the flow restrictor 3. The air inlet is located at the end of the air intake, and the support frame 5 is installed at the rear end of the flow restrictor 3. Bearings are installed at both the front and rear ends of the stepped main shaft 4. The front end of the stepped main shaft 4 is rotatably installed in the guide cone 2, and the rear end of the stepped main shaft 4 is rotatably connected to the support frame 5. Under the push of the wind, the flow restrictor 3 rotates on the column 1, and the air inlet automatically aligns with the wind direction. The three-stage staggered blade assembly is installed in the middle of the stepped main shaft 4. The three-stage staggered blade assembly is driven by the wind to carry the stepped main shaft 4 to rotate around its own axis. The rear end of the stepped main shaft 4 is connected to the drive end of the generator 10.

[0007] The aforementioned multi-bladed siphon-type horizontal axis wind turbine with a flow-limiting shroud further includes: an oblique connecting rod 14 and a transverse connecting rod 15. The two sets of wind turbines in the front row are connected by a transverse connecting rod 15, and the two sets of wind turbines in the rear row are connected by another transverse connecting rod 15. The wind turbine on the left side of the front row is connected to the wind turbine on the left side of the rear row by an oblique connecting rod 14, and the wind turbine on the right side of the front row is connected to the wind turbine on the right side of the rear row by another oblique connecting rod 14.

[0008] In the aforementioned multi-bladed siphon-type horizontal axis wind turbine with a flow-limiting shroud, the distance between the two sets of wind turbines in the front row is not less than the width of any set of wind turbines in the rear row.

[0009] In the aforementioned multi-bladed siphon-type horizontal axis wind turbine with a flow-limiting shroud, the wind turbine on the left or right side of the rear row is located on the centerline between the two wind turbines in the front row.

[0010] The aforementioned multi-bladed siphon-type horizontal axis wind turbine with a flow-limiting shroud includes a three-stage staggered blade assembly comprising: a first-stage blade 6, a second-stage blade 7, and a third-stage blade 8. The first-stage blade 6, the second-stage blade 7, and the third-stage blade 8 are installed sequentially from front to back in the middle of the stepped main shaft 4, and the blades on the first-stage blade 6, the second-stage blade 7, and the third-stage blade 8 are staggered.

[0011] It also includes: a shrink sleeve 13, and the first-stage blade 6, the second-stage blade 7 and the third-stage blade 8 are respectively installed on the stepped main shaft 4 through a shrink sleeve 13.

[0012] The above-mentioned multi-bladed siphon-type horizontal axis wind turbine with a flow-limiting shroud includes an expanded outflow structure comprising: a first duct group 31 and a second duct group 32. Multiple first ducts of the first duct group 31 are arranged at equal angles around the outer circumference of the flow-limiting shroud 3, and multiple second ducts of the second duct group 32 are arranged at equal angles around the outer circumference of the flow-limiting shroud 3. Any second duct is located between two adjacent first ducts.

[0013] The front ends of multiple air ducts 1 and 2 are connected to the interior of the flow restrictor 3, and the rear ends of multiple air ducts 1 and 2 are inclined towards the outer periphery of the flow restrictor 3 at the same angle.

[0014] In the aforementioned multi-bladed siphon-type horizontal axis wind turbine with a flow-limiting shroud, the cross-sectional position of the first duct group 31 on the flow-limiting shroud 3 is located in front of the cross-sectional position of the second duct group 32 on the flow-limiting shroud 3.

[0015] The aforementioned multi-bladed siphon-type horizontal axis wind turbine with a flow-limiting shroud further includes: angular contact ball bearings 11; two symmetrical bearing mounting slots 21 on the guide cone 2; one angular contact ball bearing 11 installed in each bearing mounting slot 21; the two symmetrical angular contact ball bearings 11 are arranged vertically; the guide cone 2 is rotatably mounted on the column 1 via the two angular contact ball bearings 11; and the rear end of the guide cone 2 is provided with a positioning mounting slot 22 for assembling the front end of the stepped main shaft 4.

[0016] The aforementioned multi-bladed siphon-type horizontal axis wind turbine with a flow-limiting shroud includes washers installed on the column 1 to limit the movement of the two angular contact ball bearings 11. Figure 6 As shown.

[0017] The aforementioned multi-bladed siphon-type horizontal axis wind turbine with a flow limiter includes: a sliding bearing 12; the front outer wall of the flow limiter 3 has two vertically connected mounting holes 33, and a sliding bearing 12 is installed in each mounting hole 33; the flow limiter 3 is rotatably mounted on the top of the column 1 via the two sliding bearings 12; the column 1 has a protrusion for limiting the lower end of the sliding bearing 12 located on the lower side.

[0018] The aforementioned multi-bladed siphon-type horizontal axis wind turbine with flow limiter also includes: a speed increaser 9, which is mounted on a support frame 5; the rear end of the stepped main shaft 4 is connected to the input end of the speed increaser 9; a generator 10 is mounted on the speed increaser 9; and the output end of the speed increaser 9 is connected to the drive end of the generator 10.

[0019] The aforementioned multi-bladed siphon-type horizontal axis wind turbine with a flow-limiting shroud further includes: a protective housing, which is mounted on the rear end face of the support frame 5. The speed increaser 9 and the generator 10 are both located inside the protective housing. The protective housing has wiring holes for cable insertion and multiple heat dissipation holes, such as... Figure 7 As shown.

[0020] The present invention, by employing the above-mentioned technology, has the following positive effects compared with the prior art:

[0021] (1) This invention uses a flow-limiting shroud to concentrate wind speed and a three-stage staggered blade group to start with high torque. The starting wind speed can be reduced to below 2.5 m / s. It can still work stably in areas with weak winds and high frequency of calm winds. The adaptability to low wind speeds is significantly improved, the application scenarios are broadened, and the problems of low wind energy utilization and insufficient energy conversion of single-stage blades are solved.

[0022] (2) The wind-gathering structure of the present invention can effectively increase the local wind speed and increase the wind energy capture capability; the three-stage staggered blade group realizes multiple energy conversions, greatly improves the power generation efficiency, and the overall power generation efficiency is significantly improved compared with the traditional single-stage blade wind turbine, solving the problems of excessive airflow escape, large tail resistance and serious energy loss.

[0023] (3) The stepped spindle of the present invention has high rigidity and reasonable stress; the expansion sleeve connection is not loose and there is no stress concentration; the whole machine has high coaxiality, low vibration and low noise, the structure is more reliable and the service life is longer, and it can operate stably for a long time, reduce maintenance costs, and solve the problems of unreliable connection between traditional spindle and blade, easy loosening and easy wear.

[0024] (4) The guide cone of the present invention regulates the air intake, the flow restrictor constrains the airflow, and the siphon outlet rapidly discharges the air, reducing turbulence, escape, and tail resistance loss throughout the process, resulting in better airflow organization, less energy loss, and better aerodynamic performance.

[0025] (5) The present invention has a compact overall structure, high degree of modularity, simple installation and maintenance, strong applicability, no need for complex pitch system, and can be widely used in mountainous areas, islands, rural areas, pastoral areas, field monitoring stations and other areas without power grid or weak power grid, to meet the off-grid distributed power supply needs. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of a single wind power generation device in a multi-bladed siphon-type horizontal axis wind turbine with a flow-limiting shroud according to the present invention. Figure 2 yes Figure 1 Front view of the air intake side. Figure 3 yes Figure 2 Rear view. Figure 4 yes Figure 2 The left view. Figure 5 yes Figure 4 A sectional view. Figure 6yes Figure 5 Enlarged view of the installation position of the sliding bearing. Figure 7 yes Figure 5 Enlarged view of the installation position of the angular contact ball bearing. Figure 8 yes Figure 5 Enlarged view of the installation position of the central expansion sleeve. Figure 9 yes Figure 5 Enlarged view of the installation location of the speed increaser and generator. Figure 10 yes Figure 2 Top view. Figure 11 This is a schematic diagram of the structure of a multi-bladed, staged siphon-type horizontal axis wind turbine with a flow-limiting shroud according to the present invention. Figure 12 yes Figure 11 The left view. Figure 13 yes Figure 11 Top view. Figure 14 yes Figure 11 The left view. Figure 15 This is a top view of the guide cone of a multi-bladed, graded siphon-type horizontal axis wind turbine with a flow-limiting shroud according to the present invention. Figure 16 yes Figure 15 AA section view in the image. Figure 17 yes Figure 15 The right view. Figure 18 This is a schematic diagram of the support frame for a multi-bladed, graded siphon-type horizontal axis wind turbine with a flow-limiting shroud according to the present invention. Figure 19 yes Figure 18 The main view. Figure 20 yes Figure 19 BB section view in the middle. Figure 21 This is a schematic diagram of the structure of the first-stage, second-stage, or third-stage blades of a multi-bladed siphon-type horizontal axis wind turbine with a flow-limiting shroud according to the present invention. Figure 22 yes Figure 11 The main view. Figure 23 yes Figure 22 CC section view in the image. Figure 24 This is a rear view of the flow-limiting shroud of a graded multi-bladed siphon-type horizontal axis wind turbine with a flow-limiting shroud according to the present invention. Figure 25 yes Figure 24 DD section view in the image. Figure 26 yes Figure 25 Top view. Figure 27 This is a schematic diagram of the speed increaser and generator of a graded multi-bladed siphon-type horizontal axis wind turbine with a flow-limiting shroud according to the present invention. Figure 28 yes Figure 27 The main view. Figure 29 yes Figure 28 Top view. Figure 30 yes Figure 28 The left view.

[0027] In the attached diagram: 1. Column; 2. Guide cone; 3. Flow restrictor; 4. Stepped main shaft; 5. Support frame; 6. First-stage blade; 7. Second-stage blade; 8. Third-stage blade; 9. Speed ​​increaser; 10. Generator; 11. Angular contact ball bearing; 12. Sliding bearing; 13. Expansion sleeve; 14. Angled connecting rod; 15. Lateral connecting rod; 21. Bearing mounting slot; 22. Positioning mounting slot; 31. Air duct group one; 32. Air duct group two; 33. Mounting through hole. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the scope of the invention.

[0029] Please refer to Figures 1 to 30 As shown, a multi-bladed, siphon-type horizontal axis wind turbine generator 10 with a flow-limiting shroud 3 is illustrated. It includes: a stepped main shaft 4, a flow-limiting shroud 3, a three-stage staggered blade assembly, an expansion sleeve 13, a guide cone 2, a support frame 5, a speed increaser 9, and a generator 10. The guide cone 2 is located at the front end of the stepped main shaft 4 and is used to guide the airflow near the center of the shaft to the working area of ​​the blades. The flow-limiting shroud 3 is a cylindrical structure of equal diameter, coaxially fitted onto the outside of the blades, used to constrain the airflow and prevent radial escape. The three-stage staggered blade assembly is fixed to the stepped main shaft 4 by the expansion sleeve 13. The first-stage blade 6, the second-stage blade 7, and the third-stage blade 8 are evenly distributed circumferentially and arranged axially in a staggered manner. A sliding bearing 12 and an angular contact ball bearing 11 are provided between the column 1 and the support frame 5. The sliding bearing 12 is used to realize the rotation of the flow-limiting shroud 3, and the angular contact ball bearing 11 is used to simultaneously bear axial and radial loads, achieving precise positioning and reliable fixation. The entire unit is symmetrically arranged in four arrays on the same base.

[0030] Furthermore, in a preferred embodiment, the column 1 passes through the flow restrictor 3 from top to bottom and is connected to the guide cone 2; the sliding bearing 12 is installed between the column 1 and the flow restrictor 3, allowing the flow restrictor 3 to rotate freely and automatically align with the wind direction; the angular contact ball bearing 11 is installed between the column 1 and the guide cone 2, bearing both axial and radial loads to achieve precise positioning and reliable fixation, preventing movement and loosening. Meanwhile, the guide cone 2 is installed at the front end of the stepped main shaft 4, guiding the airflow near the shaft to the blade area; the flow restrictor 3 has a uniform diameter throughout, constraining the airflow to prevent escape; the first-stage blades 6, second-stage blades 7, and third-stage blades 8 are arranged alternately to reduce interference and staged energy capture; the blades are fixed to the stepped main shaft 4 by expansion sleeves 13; the entire unit adopts a four-array arrangement for coordinated power generation and increased power output.

[0031] Furthermore, in a preferred embodiment, the stepped main shaft 4 has a diameter of 30mm at both ends, with one end connected to the guide cone 2 and the other end connected to the support frame 5; the middle section of the stepped main shaft 4 has a diameter of 40mm, and the three-stage staggered blade assembly is fixed by the expansion sleeve 13. The first-stage blade 6, the second-stage blade 7, and the third-stage blade 8 have the same specifications and dimensions, as shown in the figure. Figures 21 to 23 As shown, the blade diameter is 1.9m, and the flow-limiting fairing 3 is a cylindrical structure of equal diameter, 2.0m in diameter, coaxially fitted onto the outside of the blade. A speed increaser 9 and a generator 10 are sequentially installed at the rear end of the stepped main shaft 4. The entire unit adopts a four-array symmetrical arrangement to form a collaborative power generation system.

[0032] Furthermore, in a preferred embodiment, during operation, the guide cone 2 directs the central airflow near the rotating shaft to the blade area, the flow restrictor 3 constrains the airflow to prevent radial escape, and the three-stage staggered blades achieve graded wind energy capture. The entire unit employs a four-array arrangement to enhance output power. This invention significantly improves power generation efficiency at low wind speeds through airflow guidance, constraint, graded capture, and array coordination, solving the problems of wasted central airflow, large escape, low efficiency, and poor stability in traditional wind turbines. It is suitable for distributed off-grid power supply scenarios in remote areas, islands, and rural areas.

[0033] Furthermore, in a preferred embodiment, the stepped main shaft 4 has a diameter of 30mm at both ends and a diameter of 40mm in the middle section, which is used to improve load-bearing rigidity and operational stability.

[0034] Furthermore, in a preferred embodiment, the first-stage blade 6, the second-stage blade 7, and the third-stage blade 8 have the same dimensions, as shown in the figure. Figures 21 to 23 As shown, the blade diameter is 1.9m, the flow restrictor 3 diameter is 2.0m, and the diameter of the flow restrictor 3 from the inlet to the outlet remains the same.

[0035] Furthermore, in a preferred embodiment, the first-stage blade 6, the second-stage blade 7, and the third-stage blade 8 are connected to the stepped main shaft 4 by a gapless locking connection using a shrink sleeve 13, without keyways or stress concentration.

[0036] Furthermore, in a preferred embodiment, an expanded outflow structure is provided at the rear end of the flow restrictor 3 to form a siphon negative pressure to accelerate exhaust and reduce wake loss.

[0037] Furthermore, in a preferred embodiment, the four array units operate independently, synchronously capture wind, and work together to improve total power generation and power supply stability.

[0038] The above are merely preferred embodiments of the present invention and are not intended to limit the implementation methods and protection scope of the present invention.

[0039] In addition to the above, the present invention also has the following embodiments:

[0040] In a further embodiment of the present invention, the purpose of the present invention is to overcome the defects of existing small low-wind-speed wind turbines 10, such as low wind energy capture efficiency, high starting wind speed, large aerodynamic interference, insufficient structural reliability, and poor adaptability to low-wind-speed conditions. The present invention provides a horizontal axis wind turbine 10 with a flow-limiting shroud 3 and staggered blades, which features a reasonable structural design, significant wind concentration enhancement, sufficient staged energy capture, and stable and reliable operation. The present invention optimizes the entire process from airflow organization, structural design, power transmission, and energy conversion through the flow-limiting shroud 3 for wind concentration and pressurization, the three-stage staggered blades for staged energy capture, the stepped main shaft 4 for optimized stress distribution, the expansion sleeve 13 for reliable connection, and the siphon-type outlet for drag reduction and energy consumption reduction. The specific details are as follows:

[0041] In a further embodiment of the present invention, a stepped main shaft 4 structure is adopted. The rotating shaft adopts a stepped shaft form with a diameter of 30mm at both ends to meet the requirements of guide cone 2 installation, support frame 5 connection, and bearing positioning; the middle section has a diameter of 40mm, increasing the stress cross section and improving bending and torsional stiffness, which can stably support the three-stage staggered blade assembly and is not prone to deformation or vibration during long-term operation. The stepped structure can realize the axial positioning of the blades, expansion sleeve 13, and guide cone 2, simplifying the assembly process and improving the coaxiality and operational stability of the whole machine.

[0042] In a further embodiment of the present invention, the present invention adopts a flow-limiting hood 3 wind-gathering efficiency-enhancing structure design. The flow-limiting hood 3 adopts a cylindrical structure with a constant diameter throughout, with a diameter of 2.0m, which is larger than the 1.9m rotation diameter of the blade. The diameter from the inlet to the outlet remains consistent, without shrinkage or expansion. Its efficiency-enhancing principle is as follows: (1) It forces the airflow to pass through the blade area along the axial direction, preventing the airflow from escaping radially from the outside of the blade; (2) It stabilizes the internal flow field, reduces turbulence and eddy current losses, and makes the airflow act more evenly on the blade; (3) It cooperates with the rear siphon outflow to form a continuous airflow channel, increasing the working airflow per unit time; (4) It has a simple structure, is easy to process, has high strength, and is reliable in operation.

[0043] In a further embodiment of the present invention, a three-stage staggered blade group tiered energy capture design is adopted. The first-stage blade 6, second-stage blade 7, and third-stage blade 8 are arranged alternately along the axial direction to avoid aerodynamic interference caused by overlapping at the same angle. Airflow passes sequentially through the first-stage blade 6, second-stage blade 7, and third-stage blade 8, achieving tiered wind energy capture and multiple utilizations. Airflow not fully utilized by the preceding first-stage blade 6 can continue to drive the second-stage blade 7 and third-stage blade 8 to perform work, significantly improving wind energy utilization. The staggered arrangement makes the overall force distribution more uniform, increases the starting torque, significantly reduces the starting wind speed, and improves adaptability to weak winds.

[0044] In a further embodiment of the present invention, the present invention adopts a gapless connection design with a shrink-fit sleeve 13. The first-stage blade 6, the second-stage blade 7, and the third-stage blade 8 are connected to the stepped main shaft 4 by the shrink-fit sleeve 13. The clamping force is generated by the conical surface extrusion, realizing gapless transmission. There is no need for a keyway, no damage to the shaft surface, and loosening, slippage, and stress concentration are avoided. It is easy to assemble and disassemble, has high positioning accuracy, high transmission efficiency, can adapt to long-term continuous operation, and improves the reliability and service life of the whole machine.

[0045] In a further embodiment of the present invention, the present invention adopts a siphon-type exhaust port drag reduction design, and the rear end of the flow restrictor 3 adopts an enlarged outflow area structure. It utilizes the fluid siphon effect to form a local negative pressure, actively sucking up the exhaust gas after work, reducing tail vortex and resistance, making the airflow smoother, and further improving power generation efficiency and operational stability.

[0046] In a further embodiment of the present invention, the working process is as follows: natural wind first contacts the guide cone 2, which smoothly guides the airflow near the center of the rotating shaft to the working area of ​​the blades, avoiding central turbulence and impact loss; then the airflow enters the equal-diameter flow-limiting shroud 3, which forms a wind-gathering cavity, which gathers, accelerates, and pressurizes the dispersed airflow, concentrating it on the three-stage staggered blade group, greatly improving the wind energy capture capability at low wind speeds; the pressurized airflow sequentially impacts the three-stage staggered blade group, the first-stage blade 6 captures wind energy and rotates, and the airflow that is not fully utilized continues to act on the second-stage blade 7 and the third-stage blade 8; the three blades of the first-stage blade 6, the second-stage blade 7, or the third-stage blade 8 are evenly distributed at 360° and arranged axially staggered, reducing aerodynamic interference, realizing multiple capture and staged conversion of wind energy, and significantly improving the overall efficiency. The first-stage blade 6, second-stage blade 7, and third-stage blade 8 drive the stepped main shaft 4 to rotate synchronously via the expansion sleeve 13. The stepped main shaft 4 supports the guide cone 2 and the support frame 5 at both ends, respectively. The middle section of the stepped main shaft 4 carries three sets of blades, ensuring stable force distribution and smooth rotation. Power from the rear end of the stepped main shaft 4 is transmitted to the speed increaser 9, raising the low speed to the rated speed of the generator 10. This drives the generator 10 to cut magnetic field lines, stably converting mechanical energy into electrical energy output. The airflow after work is rapidly discharged through a siphon-type outlet, increasing the outflow area and reducing wake resistance and energy loss, ensuring continuous and efficient operation of the generator 10 and completing the full power generation cycle.

[0047] In a further embodiment of the present invention, the present invention uses the wind-gathering speed increase of the flow-limiting shroud 3 and the high torque start-up of the three-stage staggered blade group to reduce the start-up wind speed to below 2.5m / s. It can still work stably in areas with weak winds and high frequency of calm winds, significantly improving low wind speed adaptability, broadening application scenarios, and solving the problems of low wind energy utilization and insufficient energy conversion of single-stage blades.

[0048] In a further embodiment of the present invention, the wind-gathering structure of the present invention can effectively increase the local wind speed and increase the wind energy capture capability; the three-stage staggered blade group realizes multiple energy conversions, greatly improves the power generation efficiency, and the overall power generation efficiency is significantly improved compared with the traditional single-stage blade wind turbine, solving the problems of excessive airflow escape, large tail resistance, and serious energy loss.

[0049] In a further embodiment of the present invention, the stepped spindle 4 of the present invention has high rigidity and reasonable stress distribution; the expansion sleeve 13 connection is free from loosening and stress concentration; the whole machine has high coaxiality, low vibration and low noise, the structure is more reliable and the service life is longer, it can operate stably for a long time, reduce maintenance costs, and solve the problems of unreliable connection between traditional spindle and blade, easy loosening and easy wear.

[0050] In a further embodiment of the present invention, the guide cone 2 regulates the air intake, the flow restrictor 3 constrains the airflow, and the siphon outlet facilitates rapid outflow, thereby reducing turbulence, escape, and tail drag loss throughout the process, resulting in better airflow organization, less energy loss, and better aerodynamic performance.

[0051] In a further embodiment of the present invention, the present invention has a compact overall structure, a high degree of modularity, is easy to install and maintain, has strong applicability, does not require a complex pitch system, and can be widely used in mountainous areas, islands, rural areas, pastoral areas, field monitoring stations and other areas without power grids or with weak power grids, to meet the needs of off-grid distributed power supply.

[0052] The above are merely preferred embodiments of the present invention and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should recognize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present invention should be included within the protection scope of the present invention.

Claims

1. A multi-bladed, staged, siphon-type horizontal axis wind turbine with a flow-limiting shroud, characterized in that, include: Four sets of wind power generation devices with identical structures; Each wind power generation device includes: a column (1), a guide cone (2), a flow restrictor (3), a stepped main shaft (4), a support frame (5), a three-stage staggered blade assembly, and a generator (10). The column (1) is vertically installed, the stepped main shaft (4) is horizontally installed, the flow restrictor (3) is a cylindrical structure of equal diameter, and the flow restrictor (3) and the stepped main shaft (4) are coaxially installed. The front end of the flow restrictor (3) is rotatably installed on the top of the column (1), and the rear end outer wall of the flow restrictor (3) is provided with an expanded outflow structure. The guide cone (2) is located on the flow restrictor. (3) The guide cone (2) is rotatably mounted on the column (1), and the cone tip of the guide cone (2) faces the front air inlet of the flow restrictor (3). The support frame (5) is mounted on the rear end of the flow restrictor (3). Bearings are installed at both the front and rear ends of the stepped main shaft (4). The front end of the stepped main shaft (4) is rotatably mounted inside the guide cone (2), and the rear end of the stepped main shaft (4) is rotatably connected to the support frame (5). The three-stage staggered blade group is installed in the middle of the stepped main shaft (4). The rear end of the stepped main shaft (4) is connected to the drive end of the generator (10).

2. The multi-bladed, staged, siphon-type horizontal axis wind turbine with a flow-limiting shroud according to claim 1, characterized in that, Also includes: The two sets of wind power generating units in the front row are connected by a horizontal connecting rod (15), and the two sets of wind power generating units in the back row are connected by another horizontal connecting rod (15). The wind power generating unit on the left side of the front row is connected to the wind power generating unit on the left side of the back row by a horizontal connecting rod (14), and the wind power generating unit on the right side of the front row is connected to the wind power generating unit on the right side of the back row by another horizontal connecting rod (14).

3. The multi-bladed, staged, siphon-type horizontal axis wind turbine with a flow-limiting shroud according to claim 2, characterized in that, The distance between the two sets of wind power generation devices in the front row shall not be less than the width of any set of wind power generation devices in the back row.

4. The multi-bladed, staged, siphon-type horizontal axis wind turbine with a flow-limiting shroud according to claim 2, characterized in that, The wind turbine on the left or right side of the rear row is located on the center line between the two wind turbines in the front row.

5. The multi-bladed, staged, siphon-type horizontal axis wind turbine with a flow-limiting shroud according to claim 1, characterized in that, The three-stage staggered blade group includes: a first-stage blade (6), a second-stage blade (7) and a third-stage blade (8). The first-stage blade (6), the second-stage blade (7) and the third-stage blade (8) are installed in the middle of the stepped main shaft (4) from front to back. The blades on the first-stage blade (6), the second-stage blade (7) and the third-stage blade (8) are staggered. It also includes: a shrink sleeve (13), and first-stage blades (6), second-stage blades (7) and third-stage blades (8) are respectively installed on the stepped main shaft (4) through a shrink sleeve (13).

6. The multi-bladed, staged, siphon-type horizontal axis wind turbine with a flow-limiting shroud according to claim 1, characterized in that, The expanded outflow structure includes: a first air duct group (31) and a second air duct group (32). Multiple air ducts of the first air duct group (31) are arranged at equal angles around the outer circumference of the flow restrictor (3). Multiple air ducts of the second air duct group (32) are arranged at equal angles around the outer circumference of the flow restrictor (3). Any one air duct is located between two adjacent air ducts. The front ends of multiple air ducts 1 and 2 are connected to the interior of the flow restrictor (3), and the rear ends of multiple air ducts 1 and 2 are inclined towards the outer periphery of the flow restrictor (3) with the same inclination angle.

7. The multi-bladed, staged, siphon-type horizontal axis wind turbine with a flow-limiting shroud according to claim 6, characterized in that, The cross-sectional position of the first air duct group (31) on the flow restrictor (3) is located in front of the cross-sectional position of the second air duct group (32) on the flow restrictor (3).

8. The multi-bladed, staged, siphon-type horizontal axis wind turbine with a flow-limiting shroud according to claim 1, characterized in that, Also includes: An angular contact ball bearing (11) is provided on the guide cone (2), and two bearing mounting slots (21) are provided on the guide cone (2). An angular contact ball bearing (11) is installed in each bearing mounting slot (21). The two angular contact ball bearings (11) are arranged symmetrically on the top and bottom. The guide cone (2) is rotatably mounted on the column (1) through the two angular contact ball bearings (11). The rear end of the guide cone (2) is provided with a positioning mounting slot (22) for assembling the front end of the stepped spindle (4).

9. The multi-bladed, staged, siphon-type horizontal axis wind turbine with a flow-limiting shroud according to claim 1, characterized in that, Also includes: The front outer wall of the sliding bearing (12) and the flow restrictor (3) are provided with two mounting through holes (33) that are connected vertically. Each mounting through hole (33) is equipped with a sliding bearing (12). The flow restrictor (3) is rotatably mounted on the top of the column (1) through the two sliding bearings (12). The column (1) is provided with a protrusion for limiting the lower end of the sliding bearing (12) located on the lower side.

10. The multi-bladed, staged, siphon-type horizontal axis wind turbine with a flow-limiting shroud according to claim 1, characterized in that, Also includes: Speed ​​increaser (9) is mounted on support frame (5). The rear end of stepped main shaft (4) is connected to the input end of speed increaser (9). Generator (10) is mounted on speed increaser (9). The output end of speed increaser (9) is connected to the drive end of generator (10).

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