A vertical axis wind turbine having double layer blades

Abstract

This utility model relates to the field of wind power generation technology and discloses a vertical axis wind turbine with double-layer blades, including a central shaft assembly, inner and outer blades, several booms, several tie rods, and several diagonal rods. The inner and outer blades are arranged alternately in the circumferential direction, and the projections of the inner and outer blades are at least partially offset. Two layers of booms are arranged radially along the height direction on the outer periphery of the central shaft assembly. Tie rods are arranged circumferentially, and diagonal rods extend from the central shaft assembly to the outer blades. The outer blades are supported by the outer ends of the booms and reinforced by the tie rods and diagonal rods, so that the inner and outer blades, along with the booms, tie rods, and diagonal rods, together constitute a spatial truss rotor structure. The coaxial and alternate arrangement of the inner and outer double-layer blades forms an effective wind-guiding channel. Combined with the spatial truss force-bearing system formed by the booms, tie rods, and diagonal rods, the overall rigidity and wind load resistance are significantly improved, and the aerodynamic flow field distribution between the blades is optimized.

Description

Technical Field

[0001] This utility model relates to the field of wind power generation technology, and in particular to a vertical axis wind turbine with double-layer blades. Background Technology

[0002] Wind power, as an important form of renewable energy utilization, has been widely promoted globally in recent years. Vertical axis wind turbines (VAWTs) are gaining increasing attention in distributed energy, urban building rooftops, and remote wind power applications due to their advantages such as independence from wind direction, low operating noise, relatively simple structure, and close-to-the-ground maintenance. Compared to horizontal axis wind turbines, vertical axis wind turbines are more adaptable to areas with variable wind direction and unstable wind speeds. However, due to differences in structural form and stress characteristics, traditional vertical axis wind turbines still have significant shortcomings in terms of efficient operation and long-term stability.

[0003] Existing vertical axis wind turbines employ a single-layer blade structure, with the blades connected to the central axis via radial booms. Several problems arise during long-term operation. First, the stress path of a single-layer blade is relatively simple. Under high wind speeds or long-term fatigue loads, the blade support is prone to deformation, leading to increased vibration of the entire turbine, affecting power generation efficiency and shortening its service life. Second, conventional radial supports are mostly single boom structures, lacking multi-dimensional reinforcement measures in circumferential and radial directions. The stress system is planar, failing to form a stable spatial truss effect. This limits the ability to distribute complex wind loads and rotational torques, reducing the equipment's wind resistance stability and increasing the risk of stress concentration at critical connection points. Summary of the Invention

[0004] The purpose of this invention is to provide a vertical axis wind turbine with double-layer blades, which has a reasonable structure and balanced force, and can maintain stable operation under various wind conditions from low to high wind speeds, meeting the diverse application needs of distributed energy, urban wind power and power supply in remote areas.

[0005] To solve the above-mentioned technical problems, this utility model provides a vertical axis wind turbine with double-layer blades, comprising:

[0006] Central axis assembly;

[0007] The inner and outer blades are arranged coaxially around the central axis assembly, with the outer blades located on the outer periphery of the inner blades; the inner and outer blades are arranged alternately in the circumferential direction, and the projections of the inner and outer blades are at least partially offset.

[0008] Several booms are arranged radially along the height direction of the central shaft assembly on the outer periphery of the central shaft assembly, and the booms have upper and lower layers; the inner layer blades are fixed between the upper and lower layers of booms and are rigidly connected to the booms.

[0009] A plurality of tie rods, any one of which is used to connect any two adjacent outer blades and is arranged along the circumference of the central shaft assembly;

[0010] Several diagonal rods extend from the central shaft assembly to the outer blade;

[0011] The outer blade is supported by the outer end of the arm and reinforced by the tie rod and the diagonal rod. The inner blade, the outer blade, the arm, the tie rod, and the diagonal rod together constitute a space truss rotor structure.

[0012] Additionally, the central shaft assembly includes a motor shaft, an oil seal sleeve, a brake disc, a caliper, a housing, an end cover, and an outer shaft. A generator stator is housed inside the housing. The motor shaft, serving as the rotor output shaft, is directly connected to the brake disc. The brake disc and motor shaft are fixed via a keyed or splined connection. The end cover is coaxially connected to the outer shaft sleeve. The oil seal sleeve is located inside the end cover and seals against the outer surface of the motor shaft. The caliper is mounted on the housing and used to lock the motor shaft and brake disc together.

[0013] In addition, the vertical axis wind turbine with double-layer blades also includes a blade fixing plate, a blade pressure plate, and fasteners; the blade fixing plate and the blade pressure plate are respectively disposed on the inner and outer sides of the outer blade, and the fasteners are used to fix the outer blade to the boom, the diagonal bar, or the tie rod.

[0014] In addition, the blade fixing plate and the blade clamping plate are paired metal clamping parts, with anti-slip pads or micro-tooth surfaces on the inner side.

[0015] In addition, the central shaft assembly is fitted with an annular connecting plate, which has multiple arm mounting positions along its circumference. The arm mounting positions are used to install the arm.

[0016] In addition, the arm is a hollow or solid rod with a circular, square, or I-shaped cross-section.

[0017] In addition, the vertical axis wind turbine with double-layer blades also includes a reinforcing sleeve or the corner bracket, which is disposed at the connection between the inner blade and the boom.

[0018] In addition, the number of inner blades is 3 to 6, and the number of outer blades is 3 to 8.

[0019] Compared with existing technologies, this utility model's overall design balances aerodynamic performance, structural strength, and ease of assembly. It is suitable for space-constrained scenarios such as urban building rooftops and communication base stations, as well as remote areas with variable wind conditions, enabling low-maintenance, high-reliability distributed wind power applications. It has the following beneficial effects:

[0020] (1) By arranging the inner and outer blades in an alternating manner, an effective air guiding channel is formed, which improves the aerodynamic flow field distribution between the blades, reduces the flow interference effect, improves the wind energy capture efficiency, and adapts to the operation requirements of different wind speed ranges.

[0021] (2) A spatial truss-type force-bearing system composed of booms, tie rods and diagonal rods is adopted to form a multi-path force transmission structure in the radial, circumferential and axial directions, which significantly improves the overall structural rigidity and wind load resistance and reduces stress concentration at key nodes;

[0022] (3) The outer blades are connected by blade fixing plates and blade pressure plates for internal and external clamping, and are equipped with anti-slip pads or micro-tooth surface structures to provide stable and reliable clamping of the outer blades. This can keep the outer blades stable under long-term operation and high wind load, and prevent loosening or displacement.

[0023] (4) The tie rods are arranged in a ring at different heights of the outer blades to form a circumferential reinforcing ring. The tension can be adjusted by connecting the tie rods with the ball joints through adjustable length. This not only improves the stability of the circumferential structure, but also facilitates on-site assembly and subsequent maintenance.

[0024] (5) The diagonal bar and the boom are arranged in a cross pattern and form a triangular or quadrilateral closed unit with the tie rod, so that the force is more balanced, effectively sharing the rotational torque and wind load impact, and improving the stability and service life of the whole machine under extreme wind conditions.

[0025] (6) The central shaft assembly integrates the motor shaft, brake disc, oil seal sleeve, caliper, housing and outer shaft, which not only achieves high-response braking function, but also has good sealing and protection performance, ensuring the safety and reliability of the generator core components in long-term operation. Attached Figure Description

[0026] Figure 1 This is a perspective view of a vertical axis wind turbine with double-layer blades according to an embodiment of this utility model.

[0027] Figure 2 This is a top view of a vertical axis wind turbine with double-layer blades according to an embodiment of this utility model.

[0028] Figure 3 This is a structural diagram of the central shaft assembly according to a specific embodiment of this utility model.

[0029] As shown in the figure, 1. Central shaft assembly; 1-1. Motor shaft; 1-2. Oil seal sleeve; 1-3. Brake disc; 1-4. Caliper; 1-5. Housing; 1-6. End cover; 1-7. Outer shaft; 2. Inner blade; 3. Outer blade; 4. Fixing frame; 5. Tie rod; 6. Arm; 7. Diagonal rod; 8. Blade fixing plate; 9. Blade pressure plate. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the various embodiments of this utility model will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the various embodiments of this utility model to facilitate a better understanding of this application. However, the technical solutions claimed in the claims of this application can be implemented even without these technical details and with various variations and modifications based on the following embodiments.

[0031] The embodiments of this utility model relate to a vertical axis wind turbine with double-layer blades, such as... Figure 1 , Figure 2 As shown, the rotor includes a central shaft assembly 1, inner blades 2 and outer blades 3, several arms 6, several tie rods 5, and several diagonal rods 7. The inner blades 2 and outer blades 3 are coaxially arranged around the central shaft assembly 1, with the outer blades 3 located on the outer periphery of the inner blades 2. Two layers of arms 6 are arranged radially along the height direction on the outer periphery of the central shaft assembly 1. The tie rods 5 are arranged circumferentially, and the diagonal rods 7 extend from the central shaft assembly 1 to the outer blades 3. The inner blades 2 are fixed between the upper and lower layers of arms 6 and rigidly connected to the arms 6 via a fixing frame 4. The outer blades 3 are supported by the outer ends of the arms 6 and reinforced by the tie rods 5 and diagonal rods 7. Thus, the inner blades 2, outer blades 3, arms 6, tie rods 5, and diagonal rods 7 together constitute a spatial truss rotor structure.

[0032] Furthermore, the inner blades 2 and outer blades 3 are arranged in a staggered pattern along the circumference, and the projections of the inner blades 2 and outer blades are at least partially offset to reduce aerodynamic interference and form a channel structure that is conducive to airflow guidance, thereby improving wind energy capture efficiency. In actual use, the inner blades 2 can be configured with 3 to 6 blades, and the outer blades 3 can be configured with 3 to 8 blades.

[0033] Specifically, in this embodiment, such as Figure 3As shown, the central shaft assembly 1 includes a motor shaft 1-1, an oil seal sleeve 1-2, a brake disc 1-3, a caliper 1-4, a housing 1-5, an end cover 1-6, and an outer shaft 1-7. The housing 1-5 houses the generator stator. The motor shaft 1-1, as the rotor output shaft, is directly connected to the brake disc 1-3, shortening the braking force transmission chain and improving braking response speed and safety. The brake disc 1-3 is fixed to the motor shaft 1-1 via a keyed or splined connection. The end cover 1-6 is coaxially connected to the outer shaft 1-7, providing axial positioning and protection for the motor shaft 1-1. An oil seal sleeve 1-2 seals the space between the motor shaft 1-1 and the brake disc 1-3. The oil seal sleeve 1-2 is located inside the end cover 1-6 and seals against the outer surface of the motor shaft 1-1. The caliper 1-4 is mounted on the housing 1-5 and is used to lock the motor shaft 1-1 and the brake disc 1-3. The caliper 1-4 and the brake disc 1-3 work together to achieve normal stopping or emergency braking functions. Therefore, the central shaft assembly 1 integrates the brake disc 1-3, the oil seal sleeve 1-2, and the caliper 1-4 braking device, achieving both high-response braking performance and good sealing and protection performance, ensuring the safety and reliability of the generator's core components during long-term operation.

[0034] Furthermore, in this embodiment, such as Figure 1 , Figure 2 As shown, the vertical axis wind turbine with double-layer blades also includes blade fixing plates 8 and blade clamping plates 9 located on the inner and outer sides of the outer blade 3. The outer blade 3 is clamped by the blade fixing plates 8 and blade clamping plates 9 and fixed to the boom 6, diagonal bar 7, or tie rod 5 by fasteners. It is worth noting that in this embodiment, the blade fixing plates 8 and blade clamping plates 9 are paired metal clamping components, and the inner side may be provided with anti-slip pads or micro-tooth surfaces to improve clamping friction and positioning accuracy. The blade fixing plates 8 and blade clamping plates 9 have multiple through holes along the length direction of the outer blade 3 for bolt locking to ensure the stability of the connection during long-term operation. Therefore, the outer blade 3 adopts an inner and outer clamping fixing method, combined with anti-slip pads and a multi-point locking structure, to ensure a firm and reliable connection and high operational stability.

[0035] In addition, in this embodiment, such as Figure 1 , Figure 2As shown, any tie rod 5 is used to connect any two adjacent outer blades 3. Each tie rod 5 is arranged circumferentially along the central shaft assembly 1, forming at least two circumferential reinforcing rings at different heights of the outer blades 3. Adjustable length rods or rods with ball joints at the ends can be used to compensate for assembly errors and facilitate tensioning correction, which improves the stability and positioning accuracy of the circumferential structure and facilitates on-site assembly and subsequent maintenance. One end of the diagonal rod 7 is connected to the root of the central shaft assembly 1 or the arm 6, and the other end is connected to the outer blade 3 through the blade fixing plate 8 and the blade pressure plate 9. The diagonal rod 7 and the arm 6 are arranged intersectingly in space and together with the tie rods 5 form a triangular or quadrilateral closed force unit, thereby forming a stable spatial truss structure under rotation and wind loads, effectively distributing radial and torsional loads.

[0036] Specifically, the central shaft assembly 1 is also fitted with an annular connecting plate. The arm 6 is a hollow or solid rod with a circular, square, or I-shaped cross-section, and is fixedly connected to the central shaft assembly 1 through the annular connecting plate. The annular connecting plate has multiple arm 6 mounting positions equidistantly arranged along its circumference. The arm 6 is mounted on the annular connecting plate through these mounting positions to achieve an equiangular arrangement. In addition, a reinforcing sleeve or corner bracket can be provided at the connection between the inner blade 2 and the arm 6 to improve the local structural strength. Furthermore, in this embodiment, the inner blade 2 and the outer blade 3 are made of extruded metal or composite material sheets. The root areas of the inner blade 2 and the outer blade 3 can be thickened to improve clamping strength. A limiting block or positioning pin can be provided at the connection between the outer blade 3 and the arm 6 to precisely limit the radial and circumferential positions of the blade.

[0037] Furthermore, in this embodiment, the overall configuration of the boom 6, tie rod 5, diagonal rod 7, inner blade 2, and outer blade 3 can be set as a modular design, and each component can be disassembled and assembled independently, which facilitates transportation, on-site assembly, tension adjustment, and subsequent maintenance. At the same time, it can be adapted to the needs of different sizes and power levels, and has good scalability and applicability.

[0038] As can be seen from the above, the coaxial and staggered arrangement of the inner and outer double-layer blades forms an effective airflow channel, improves the aerodynamic flow field distribution between the blades, reduces flow interference effects, and enhances wind energy capture efficiency. Combined with the spatial truss-like force system formed by the boom 6, tie rod 5, and diagonal rod 7, a multi-path force transmission structure is formed in the radial, circumferential, and axial directions, significantly improving the overall structural rigidity and wind load resistance, and reducing stress concentration at key nodes. Therefore, it not only significantly improves overall rigidity and wind load resistance but also optimizes the aerodynamic flow field distribution between the blades, reduces interference effects, and improves wind energy capture efficiency, achieving enhanced overall rigidity, reliable blade fixation, and high operational stability, meeting the long-term, high-efficiency operation requirements under various complex wind conditions.

[0039] Furthermore, the outer blade 3 is connected by a blade fixing plate 8 and a blade pressure plate 9 for internal and external clamping, and is equipped with anti-slip pads or micro-tooth surface structures to stably and reliably clamp the outer blade 3. This ensures that the outer blade 3 remains stable under long-term operation and high wind loads, preventing loosening or displacement. The tie rod 5 is arranged in a ring at different heights of the outer blade 3 to form a circumferential reinforcement ring. The tension can be adjusted by connecting it to a ball joint with an adjustable length, which not only improves the stability of the circumferential structure but also facilitates on-site assembly and subsequent maintenance. The diagonal bar 7 and the arm 6 are arranged in a cross pattern and form a triangular or quadrilateral closed unit with the tie rod 5, making the force more balanced and effectively distributing the rotational torque and wind load impact, thereby improving the stability and service life of the whole machine under extreme wind conditions. The central shaft assembly 1 integrates the motor shaft 1-1, brake disc 1-3, oil seal sleeve 1-2, caliper 1-4, housing 1-5 and outer shaft 1-7, which not only achieves high-response braking function but also has good sealing and protection performance, ensuring the safety and reliability of the generator core components during long-term operation. The overall design takes into account aerodynamic performance, structural strength and ease of assembly, making it suitable for space-constrained scenarios such as urban building rooftops and communication base stations, as well as remote areas with variable wind conditions, enabling low-maintenance and high-reliability distributed wind power applications.

[0040] Those skilled in the art will understand that the above embodiments are specific examples of implementing this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A vertical axis wind turbine with double-layer blades, characterized in that, include: Central axis assembly; The inner blades and the outer blades are arranged coaxially around the central axis assembly, with the outer blades located on the outer periphery of the inner blades; The inner blades and the outer blades are arranged alternately in the circumferential direction, and the projections of the inner blades and the outer blades are at least partially offset. Several booms are arranged radially along the height direction of the central shaft assembly on the outer periphery of the central shaft assembly, and the booms have upper and lower layers; the inner layer blades are fixed between the upper and lower layers of booms and are rigidly connected to the booms. A plurality of tie rods, any one of which is used to connect any two adjacent outer blades and is arranged along the circumference of the central shaft assembly; Several diagonal rods extend from the central shaft assembly to the outer blade; The outer blade is supported by the outer end of the arm and reinforced by the tie rod and the diagonal rod. The inner blade, the outer blade, the arm, the tie rod, and the diagonal rod together constitute a space truss rotor structure.

2. The vertical axis wind turbine with double-layer blades according to claim 1, characterized in that, The central shaft assembly includes a motor shaft, an oil seal sleeve, a brake disc, a caliper, a housing, an end cap, and an outer shaft; The generator stator is installed inside the housing. The motor shaft, as the rotor output shaft, is directly connected to the brake disc. The brake disc and the motor shaft are fixed by a key or spline connection. The end cover is coaxially connected to the outer sleeve shaft. The oil seal sleeve is located inside the end cover and seals with the outer surface of the motor shaft. The caliper is installed on the housing and is used to lock the motor shaft and the brake disc.

3. The vertical axis wind turbine with double-layer blades according to claim 1, characterized in that, The vertical axis wind turbine with double-layer blades also includes a blade fixing plate, a blade pressure plate, and fasteners; the blade fixing plate and the blade pressure plate are respectively disposed on the inner and outer sides of the outer blade, and the fasteners are used to fix the outer blade to the boom, the diagonal bar, or the tie rod.

4. The vertical axis wind turbine with double-layer blades according to claim 3, characterized in that, The blade fixing plate and the blade pressure plate are paired metal clamping parts, with anti-slip pads or micro-tooth surfaces on the inner side.

5. The vertical axis wind turbine with double-layer blades according to claim 1, characterized in that, The central shaft assembly is fitted with an annular connecting plate, which has multiple arm mounting positions along its circumference. The arm mounting positions are used to install the arm.

6. The vertical axis wind turbine with double-layer blades according to claim 1, characterized in that, The arm is a hollow or solid rod with a circular, square, or I-shaped cross-section.

7. The vertical axis wind turbine with double-layer blades according to claim 1, characterized in that, The vertical axis wind turbine with double-layer blades also includes a reinforcing sleeve or the corner bracket, which is disposed at the connection between the inner blade and the boom.

8. The vertical axis wind turbine with double-layer blades according to claim 1, characterized in that, The number of inner blades is 3 to 6, and the number of outer blades is 3 to 8.

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