Involute type wind gathering and flow guiding device for wind driven generator
By optimizing the airflow path through an involute-type wind-gathering and guiding device, the problem of low wind energy utilization in vertical axis wind turbines has been solved, resulting in improved rotor torque and efficiency, and enabling continuous and effective power generation under low wind speeds.
Patent Information
- Application Number
- CN202511379345.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-25
- Publication Date
- 2025-11-14
AI Technical Summary
Existing vertical axis wind turbines suffer from low wind energy utilization. Drag-type wind turbines have high starting torque but low operating speed, while lift-type wind turbines have high operating efficiency but poor starting performance. Traditional flow guiding devices cannot effectively organize airflow, resulting in energy loss.
An involute-type wind-gathering and air-guiding device is adopted, including a support frame, a first air guide plate array, and a second air guide plate array. By designing wind-gathering channels and air-guiding channels, the airflow path is optimized to form laminar wind speed and improve the rotor torque and efficiency.
Without increasing the rotor diameter, the rotor torque and speed are significantly improved, airflow eddy losses are reduced, wind energy utilization is increased, and continuous and effective power generation is achieved at low wind speeds.
Smart Images
Figure CN120946497A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of wind power generation technology, and in particular to an involute-type wind concentrator for wind turbines. Background Technology
[0002] Vertical axis wind turbines (VAWTs) have a promising future in distributed generation due to their advantages such as being unaffected by wind direction, simple structure, and easy maintenance. However, they generally suffer from low wind energy utilization: drag-type turbines (such as Savonius type) have high starting torque but low operating speed; lift-type turbines (such as Darrieus type or H type) have high operating efficiency but poor starting performance.
[0003] In existing technologies, methods to improve wind turbine performance typically involve increasing the rotor diameter or adding a simple deflector. Increasing the rotor diameter can lead to stability, cost, and noise issues; while a simple deflector often fails to effectively organize airflow and may instead generate turbulence and vortices at the turbine's tip, resulting in energy loss and even reduced turbine efficiency.
[0004] Therefore, there is an urgent need for an external flow guiding device with a reasonable structure, significant flow guiding effect, and the ability to effectively improve the start-up performance and operating efficiency of vertical axis fans. Summary of the Invention
[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide an involute wind concentrator for wind turbines, which can efficiently gather natural wind and transform it into ordered laminar flow, significantly improving the starting torque, operating speed and wind energy utilization efficiency of vertical axis wind turbines.
[0006] To achieve the objectives of this invention, the following technical solution is adopted:
[0007] An involute-type wind-gathering and guiding device for wind turbines includes a support frame, a first guide plate array, and a second guide plate array.
[0008] The first guide vane array includes several first-order guide vanes, which are evenly distributed circumferentially between the top and bottom frames of the support frame. The second guide vane array includes several second-order guide vanes, which are evenly distributed circumferentially between the top and bottom frames of the support frame. The annular space formed by the several second-order guide vanes is used to install the wind turbine assembly.
[0009] A further improvement is that the first guide vane array surrounds the second guide vane array, and the number of the second-order guide vanes is twice the number of the first-order guide vanes. The positions of several first-order guide vanes correspond to the positions of several second-order guide vanes at intervals, and the inner edges of several first-order guide vanes are respectively connected and fixed to the outer edges of the corresponding second-order guide vanes.
[0010] A further improvement is that the second-order guide plate is obliquely arranged, and the angle between the line connecting the end of the second-order guide plate away from the annular space and the center point of the annular space and the second-order guide plate is between 12° and 22°; the first-order guide plate is perpendicular to the center line of the annular space.
[0011] A further improvement is that an air-gathering channel is formed between two adjacent first-order guide plates, and a flow-guiding channel is formed between two adjacent second-order guide plates, with each air-gathering channel connecting two flow-guiding channels respectively.
[0012] A further improvement is that the number of second-stage guide vanes is 16, the number of first-stage guide vanes is 8, the number of wind-gathering channels is 8, and a grid protective net is installed at the outer edge of each wind-gathering channel.
[0013] A further improvement is that it also includes an upper isolation cover and a lower isolation cover. The upper isolation cover is installed on the top frame of the support frame and covers the upper end surfaces of the first and second guide vane arrays. The lower isolation cover is installed on the bottom frame of the support frame and covers the lower end surfaces of the first and second guide vane arrays.
[0014] A further improvement is that concentric ring structures are fixedly installed on the top frame and the bottom frame of the support frame. The concentric ring structure includes an inner ring and an outer ring. The concentric ring structure of the top frame is used to fix the top surface of the first guide vane array and the second guide vane array, and the concentric ring structure of the bottom frame is used to fix the bottom surface of the first guide vane array and the second guide vane array.
[0015] A further improvement is that the support frame is a cubic frame composed of 12 edges. Each edge of the cubic frame has three fixed points evenly distributed to serve as fixed connection points for the first guide plate array and the second guide plate array. The outer ring installed on the top frame of the support frame is the inner ring of the top frame, and the outer ring installed on the bottom frame of the support frame is the inner ring of the bottom frame. The top frame and the bottom frame of the support frame are respectively provided with cross-shaped connecting rods for fixing the concentric ring structure.
[0016] A further improvement is that the four sides of the support frame are each provided with a cross-shaped reinforcing connecting rod.
[0017] A further improvement is that it also includes a bottom support frame, which is installed at the bottom of the support frame to support the entire device. A generator is installed inside the bottom support frame. The wind turbine assembly includes a shaft and fan blades. The shaft is rotatably mounted between cross-shaped connecting rods on the top and bottom frames. The output end of the shaft is used to connect to the rotating shaft of the generator. The fan blades are mounted on the shaft to drive the shaft to rotate, thereby generating electricity.
[0018] The beneficial effects of this invention are as follows:
[0019] The present invention provides an involute-type wind-gathering and guiding device for wind turbines, which can increase the effective wind force received by the wind turbine and obtain greater torque without increasing the diameter of the S-type wind turbine. Under the same wind speed, it reduces airflow eddy losses, makes the airflow in the central area laminar, increases the wind turbine speed, and thus improves the wind energy utilization rate of S-type and H-type wind turbines. Through omnidirectional wind gathering and guiding optimization, the airflow velocity in the central area reaches the start-up threshold of the H-type wind turbine, realizing continuous and effective power generation of S-type and H-type wind turbines at low wind speeds. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the overall structure of an involute wind concentrator and guide device for a wind turbine generator after the installation of the wind turbine assembly.
[0021] Figure 2 This is a schematic diagram of the structure of the first and second guide vane arrays of the present invention;
[0022] Figure 3 This is a schematic diagram of the arrangement of the first and second guide vane arrays of the present invention;
[0023] Figure 4 This is a schematic diagram showing the airflow direction in the air-gathering and guiding device.
[0024] Figure 5 A structural diagram of the supporting frame;
[0025] Figure 6 This is a schematic diagram of the bottom support frame.
[0026] Explanation of reference numerals in the attached figures:
[0027] 1. Support frame; 2. First-stage guide vane; 3. Second-stage guide vane; 4. Annular space; 5. Wind turbine assembly; 6. Grid protective net; 7. Upper isolation cover; 8. Lower isolation cover; 9. Inner ring; 10. Outer ring; 11. Cross-shaped connecting rod; 12. Cross-shaped reinforcing connecting rod; 13. Bottom support frame; 14. Generator. Detailed Implementation
[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the scope of protection of this invention.
[0029] It should be noted that when a component is referred to as "fixed to," "set on," "fixed to," or "mounted on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component. Furthermore, when a component is considered to be "transmittally connected" to another component, the two components only need to be able to transmit power; the specific implementation can be achieved using existing technologies, which will not be elaborated here. When a component is perpendicular or approximately perpendicular to another component, it means that the two components are ideally perpendicular, but due to manufacturing and assembly effects, there may be a certain degree of perpendicularity error. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only and do not represent the only possible implementation.
[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.
[0031] In this invention, the terms "first" and "second" do not represent a specific quantity or order, but are merely used to distinguish names.
[0032] Please refer to the attached document. Figure 1 -Appendix Figure 6 This invention proposes an involute-type wind-gathering and guiding device for wind turbines, comprising a support frame 1, a first guide plate array, and a second guide plate array.
[0033] Specifically, such as Figure 1 , Figure 2As shown, the first guide vane array includes several first-order guide vanes 2, which are evenly distributed circumferentially between the top and bottom frames of the support frame 1. The second guide vane array includes several second-order guide vanes 3, which are evenly distributed circumferentially between the top and bottom frames of the support frame 1. The annular space 4 formed by the several second-order guide vanes 3 is used to install the wind turbine assembly 5 (such as Savonius type, Darrieus type wind turbine, etc.).
[0034] Understandably, a specific airflow channel system is constructed between the top and bottom frames of the support frame 1 through two circumferentially distributed guide vane arrays. The first guide vane array is mainly responsible for wind capture in the periphery, while the second guide vane array is responsible for wind guidance. The two work together to change the flow path and state of the natural wind. Finally, the annular space 4 enclosed by the second guide vane array provides an ideal working environment for the wind turbine assembly 5, enabling the wind turbine assembly 5 to be driven efficiently.
[0035] like Figure 2 As shown, the first guide vane array surrounds the second guide vane array, and the number of second-order guide vanes 3 is twice the number of first-order guide vanes 2. The positions of several first-order guide vanes 2 and several second-order guide vanes 3 are spaced correspondingly, and the inner edges of several first-order guide vanes 2 are respectively connected and fixed to the outer edges of the corresponding second-order guide vanes 3, thereby forming an airflow path similar to an involute (an involute is a curve with continuously changing curvature; when airflow flows along it, its direction changes gradually and smoothly). An air-gathering channel is formed between two adjacent first-order guide vanes 2, and a guiding channel is formed between two adjacent second-order guide vanes 3. Each air-gathering channel connects to two guiding channels.
[0036] Understandably, the first guide vane array surrounds the second guide vane array, and the two are positioned at corresponding intervals. The inner edge of the first-order guide vane 2 is connected and fixed to the outer edge of the corresponding second-order guide vane 3, realizing a seamless connection between the inner and outer guide vane arrays. This constructs a continuous and stable flow channel from the outer ring where the wind gathers to the inner ring where it accelerates, making the transition of the airflow from the outer ring to the inner ring smooth and unobstructed. Finally, a high-speed and uniform laminar wind speed is formed at the end outlet, effectively eliminating airflow turbulence and energy loss, significantly improving the wind speed and wind energy density in the central area, thereby greatly improving the start-up performance and power generation efficiency of the wind turbine.
[0037] In this implementation, such as Figure 3As shown, the second-order guide vane 3 is obliquely arranged, and the angle α between the line connecting the end of the second-order guide vane 3 away from the annular space 4 and the center point of the annular space 4 and the second-order guide vane 3 is between 12° and 22°; the first-order guide vane 2 is perpendicular to the center line of the annular space 4. The first guide vane array can converge airflow in any direction, achieving a good wind-gathering effect.
[0038] It is understandable that the oblique arrangement of the second-order guide plate 3 ensures that when the airflow leaves the second-order guide plate 3, it can impact the wind turbine blades with the optimal tangential angle of attack, generating the maximum rotational torque, while minimizing the impact resistance on the back of the blades.
[0039] This invention extends the airflow distance through the cooperation of a first and a second guide vane array. The second guide vane array divides and guides the airflow, reducing turbulence at the end and making it easier to obtain uniform laminar airflow speeds at narrow end outlets. In other words, the first guide vane array first concentrates the airflow, and then the second guide vane array precisely guides and increases its speed, maximizing the concentration of wind energy within the annular space 4. This solves the shortcomings of traditional guide vanes that either concentrate airflow without guiding it or guide it without concentrating it.
[0040] It is understandable that extending the flow distance of the wind allows the dispersed natural wind to have enough time to be rectified. Natural wind itself has problems such as uneven wind speed and turbulent direction. During long-distance flow, the airflow will gradually become uniform within the channel, eliminating local eddies.
[0041] like Figure 4 As shown, this invention, through the cooperation of a first guide vane array and a second guide vane array, achieves excellent airflow guidance, minimizing vortices in the airflow entering the central region. The converging airflow is concentrated in one half of the central circle, while the airflow impact force in the other half is very small. The blades in the concentrated airflow region receive a large airflow driving force, while the blades in the other half, where the airflow impact is minimal, receive very little airflow impact force. Especially for drag-type wind turbines, this allows for the full absorption of the frontal driving force of the airflow, while the airflow resistance on the other side is very small, enabling drag-type wind turbines to absorb as much wind power as possible. This asymmetrical flow field distribution creates ideal working conditions for drag-type wind turbines (such as the Savonius type): the working surface bears the maximum driving force, while the drag surface experiences minimal reverse force, thereby significantly improving net output torque and wind energy absorption efficiency.
[0042] Preferably, the ratio L1 / L2 of the lengths of the first-order guide plate 2 and the second-order guide plate 3 is between 0.5 and 1.5.
[0043] In this embodiment, there are 16 second-order guide plates 3, 8 first-order guide plates 2, and 8 wind-gathering channels. Each wind-gathering channel has a grid protective net 6 installed at its outer edge.
[0044] Understandably, the grid protective net 6 can be made of high-strength metal material, and the mesh size can be set according to actual needs. It is used to block birds, debris, etc. from entering the guide channel, avoiding equipment damage and safety hazards, while ensuring smooth airflow and having minimal impact on overall aerodynamic performance. Specifically, the grid protective net 6 can be fixed to the edge of the first-stage guide plate 2 by means of detachable clips or bolts, which facilitates daily maintenance, cleaning, and replacement.
[0045] In this embodiment, as Figure 1 and Figure 2 As shown, it also includes an upper isolation cover 7 and a lower isolation cover 8. The upper isolation cover 7 is installed on the top frame of the support frame 1 and covers the upper end surfaces of the first guide vane array and the second guide vane array. The lower isolation cover 8 is installed on the bottom frame of the support frame 1 and covers the lower end surfaces of the first guide vane array and the second guide vane array.
[0046] Understandably, according to fluid mechanics, airflow always tends to escape towards areas of lower pressure. Without the isolation shield, the accelerated airflow would escape through the large openings at the top and bottom, causing a rapid drop in wind pressure and speed at the center. By installing the upper isolation shield 7 and the lower isolation shield 8, the airflow is forced to concentrate in the central rotor area, preventing it from escaping from the top and bottom, thus significantly improving wind energy utilization efficiency.
[0047] Specifically, in this embodiment, such as Figure 5 As shown, concentric ring structures are fixedly installed on the top frame and the bottom frame of the support frame 1. The concentric ring structure includes an inner ring 9 and an outer ring 10. The concentric ring structure of the top frame is used to fix the top surface of the first guide plate array and the second guide plate array, and the concentric ring structure of the bottom frame is used to fix the bottom surface of the first guide plate array and the second guide plate array.
[0048] Specifically, one end of the top surface of the second-stage guide vane 3 of the second guide vane array is fixedly connected to the inner ring 9 of the top frame, and the other end of the top surface of the second-stage guide vane 3 of the second guide vane array is fixedly connected to the outer ring 10 of the top frame. One end of the lower surface of the second-stage guide vane 3 of the second guide vane array is fixedly connected to the inner ring 9 of the base frame, and the other end of the lower surface of the second-stage guide vane 3 of the second guide vane array is fixedly connected to the outer ring 10 of the base frame. This connection can be achieved through welding or by using locking clips. The structure of the inner ring 9 and the outer ring 10 ensures precise positioning and stable installation of the guide vane array, guaranteeing the structural rigidity of the guide vane array.
[0049] Specifically, in this embodiment, such as Figure 5 As shown, the support frame 1 is a cubic frame composed of 12 edges. Each edge of the cubic frame has three evenly distributed fixing points for fixing the first and second guide vane arrays. The outer ring 10 installed on the top frame of the support frame 1 is the inscribed ring of the top frame, and the outer ring 10 installed on the bottom frame of the support frame 1 is the inscribed ring of the bottom frame. Cross-shaped connecting rods 11 are respectively provided on the top and bottom frames of the support frame 1 for fixing the concentric ring structure. Cross-shaped reinforcing connecting rods 12 are respectively provided on the four sides of the support frame 1. The horizontal and vertical bars of the cross-shaped reinforcing connecting rods 12 also have three evenly distributed fixing points for fixing the first and second guide vane arrays, further enhancing the structural stability of the first and second guide vane arrays. The first and second deflector arrays are integrated with the cubic frame to form a robust whole structure, so that even in strong winds, the first and second deflector arrays are not easily blown down by the wind.
[0050] Preferably, other wind power-related structures can be installed above or below the cubic frame structure. For example, an identical wind-gathering and guiding device and wind turbine assembly 5 can be stacked on top, and the generator 14 and its supporting structure can be installed below. In this embodiment, as shown... Figure 1 and Figure 6 As shown, it also includes a bottom support frame 13, which is installed at the bottom of the support frame 1 to support the entire device. A generator 14 is installed inside the bottom support frame 13. The wind turbine assembly 5 includes a shaft and fan blades. The shaft is rotatably installed between the cross-shaped connecting rods 11 on the top frame and the bottom frame. The output end of the shaft is used to connect with the rotating shaft of the generator 14. The fan blades are installed on the shaft to drive the shaft to rotate, thereby generating electricity for the generator 14.
[0051] The present invention provides an involute-type wind-gathering and guiding device for wind turbines, which can increase the effective wind force received by the wind turbine and obtain greater torque without increasing the diameter of the S-type wind turbine. Under the same wind speed, it reduces airflow eddy losses, makes the airflow in the central area laminar, increases the wind turbine speed, and thus improves the wind energy utilization rate of S-type and H-type wind turbines. Through omnidirectional wind gathering and guiding optimization, the airflow velocity in the central area reaches the start-up threshold of the H-type wind turbine, realizing continuous and effective power generation of S-type and H-type wind turbines at low wind speeds.
[0052] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0053] The embodiments described above are merely illustrative of specific implementations of the present invention, and while the descriptions are detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.
Claims
1. An involute-type wind-gathering and guiding device for wind turbines, characterized in that, Includes a support frame, a first deflector array, and a second deflector array; The first guide vane array includes several first-order guide vanes, which are evenly distributed circumferentially between the top and bottom frames of the support frame. The second guide vane array includes several second-order guide vanes, which are evenly distributed circumferentially between the top and bottom frames of the support frame. The annular space formed by the several second-order guide vanes is used to install the wind turbine assembly.
2. The involute-type wind-gathering and guiding device for a wind turbine generator according to claim 1, characterized in that, The first guide vane array surrounds the second guide vane array, and the number of second-order guide vanes is twice the number of first-order guide vanes. The positions of several first-order guide vanes correspond to the positions of several second-order guide vanes at intervals, and the inner edges of several first-order guide vanes are respectively connected and fixed to the outer edges of the corresponding second-order guide vanes.
3. The involute-type wind-gathering and guiding device for a wind turbine generator according to claim 2, characterized in that, The second-order guide plate is obliquely arranged, and the angle between the line connecting the end of the second-order guide plate away from the annular space and the center point of the annular space and the second-order guide plate is between 12° and 22°; the first-order guide plate is perpendicular to the center line of the annular space.
4. The involute-type wind-gathering and guiding device for a wind turbine generator according to claim 2, characterized in that, An air-gathering channel is formed between two adjacent first-order guide plates, and a flow-guiding channel is formed between two adjacent second-order guide plates. Each air-gathering channel is connected to two flow-guiding channels.
5. The involute-type wind-gathering and guiding device for a wind turbine generator according to claim 4, characterized in that, The number of second-stage guide vanes is 16, the number of first-stage guide vanes is 8, the number of wind-gathering channels is 8, and a grid protective net is installed at the outer edge of each wind-gathering channel.
6. An involute-type wind-gathering and guiding device for a wind turbine according to any one of claims 1-5, characterized in that, It also includes an upper isolation cover and a lower isolation cover. The upper isolation cover is installed on the top frame of the support frame and covers the upper end surfaces of the first and second guide vane arrays. The lower isolation cover is installed on the bottom frame of the support frame and covers the lower end surfaces of the first and second guide vane arrays.
7. The involute-type wind-gathering and guiding device for a wind turbine generator according to claim 1, characterized in that, Concentric ring structures are fixedly installed on the top frame and the bottom frame of the support frame. Each concentric ring structure includes an inner ring and an outer ring. The concentric ring structure of the top frame is used to fix the top surfaces of the first and second guide vane arrays, and the concentric ring structure of the bottom frame is used to fix the lower surfaces of the first and second guide vane arrays.
8. The involute-type wind-gathering and guiding device for a wind turbine generator according to claim 7, characterized in that, The support frame is a cubic frame composed of 12 edges. Each edge of the cubic frame has 3 fixed points evenly distributed to serve as fixed connection points for the first guide plate array and the second guide plate array. The outer ring installed on the top frame of the support frame is the inner ring of the top frame, and the outer ring installed on the bottom frame of the support frame is the inner ring of the bottom frame. The top frame and the bottom frame of the support frame are respectively provided with cross-shaped connecting rods for fixing the concentric ring structure.
9. An involute-type wind-gathering and guiding device for a wind turbine generator according to claim 8, characterized in that, The support frame is provided with cross-shaped reinforcing connecting rods on its four sides.
10. An involute-type wind-gathering and guiding device for a wind turbine generator according to claim 8, characterized in that, It also includes a bottom support frame, which is installed at the bottom of the support frame to support the entire device. A generator is installed inside the bottom support frame. The wind turbine assembly includes a shaft and fan blades. The shaft is rotatably mounted between cross-shaped connecting rods on the top and bottom frames. The output end of the shaft is used to connect to the rotating shaft of the generator. The fan blades are mounted on the shaft to drive the shaft to rotate, thereby generating electricity.