Wind wheel blade structure of vertical axis wind turbine

Abstract

The wind wheel blade structure comprises an upper end cover, a vertical shaft, a tension bar, an external H-shaped wind wheel blade, an internal air duct and a lower end cover, the spiral design of the internal air duct is beneficial to guiding airflow to smoothly pass through an internal space, eddy current loss is reduced, the wind energy conversion efficiency is improved, and the wind wheel blade structure can be started at low wind speed. The internal air duct rotates at a constant speed to drive the external H-shaped wind wheel blades to rotate, the speed is controllable, and the effect of stably outputting electric power is achieved. The wind driven generator can be started at low wind speed, the speed is controllable, and electric power is stably output.

Description

Technical Field

[0001] This utility model relates to a component of a vertical axis wind turbine, and more particularly to a wind turbine blade structure for a vertical axis wind turbine. Background Technology

[0002] Despite their diverse types, existing wind turbines can be broadly categorized into two types: horizontal-axis wind turbines, where the rotor's axis of rotation is parallel to the wind direction; and vertical-axis wind turbines, where the rotor's axis of rotation is perpendicular to the ground or the airflow direction. Vertical-axis wind turbines do not require alignment with the wind when the wind direction changes, which is a significant advantage over horizontal-axis wind turbines. This not only optimizes the structural design but also reduces the gyroscopic force exerted by the rotor on the wind direction.

[0003] Vertical axis H-type wind turbines require relatively strong winds to start, primarily due to their design principles and structural characteristics. Compared to horizontal axis wind turbines, the blades of vertical axis wind turbines experience uneven wind forces during rotation, resulting in a greater need for wind to overcome blade inertia and air resistance during startup. Therefore, at low wind speeds, vertical axis H-type wind turbines may struggle to start or fail to output sufficient power.

[0004] The working principle of a vertical axis H-type wind turbine mainly relies on the forces acting on the blades in the wind to drive the rotor to rotate. However, due to the uncertainty of wind speed and direction, as well as the unevenness of the wind forces acting on the blades during rotation, it is difficult to maintain a stable rotational speed of the wind turbine. This fluctuating rotational speed leads to instability in the output power, further increasing the difficulty of speed control. Summary of the Invention

[0005] This invention proposes a wind turbine blade structure for a vertical axis wind turbine, enabling the wind turbine to start at low wind speeds, with controllable speed and stable power output.

[0006] A wind turbine blade structure for a vertical axis wind turbine includes an upper end cover, a vertical shaft, a tension rod, an outer H-shaped wind turbine blade, an inner wind tunnel, and a lower end cover;

[0007] Furthermore, the internal air duct is fixedly connected to the upper and lower end covers by bolts;

[0008] Furthermore, the upper and lower end caps are connected to the vertical shaft by bolts or other fasteners;

[0009] Furthermore, the tension rod is connected to the upper and lower end caps using high-strength bolts or welding.

[0010] Furthermore, the internal air duct employs two sets of impeller blades arranged in a spiral shape, rotating around a vertical axis. Its shape resembles a spiral staircase, featuring a continuous and smooth curved surface. The spiral blades gradually rotate from bottom to top along the vertical axis, forming a three-dimensional spiral structure; guiding the airflow to spiral upwards along the axial direction, generating a tangential force to propel the air duct to rotate at a uniform speed, reducing the starting wind speed.

[0011] Furthermore, the external H-shaped wind turbine has three or five blades, each of which is fixed to the upper and lower end caps in the middle by a tension rod; it rotates synchronously under the drive of the wind tunnel, increasing the windward area and improving the power output in the high wind speed range.

[0012] Furthermore, the internal wind turbine blades and the external H-shaped wind turbine blades are made of one of the following materials: aluminum alloy, composite materials, basalt materials, and carbon fiber materials. Beneficial effects

[0013] The spiral design of the internal duct helps guide airflow smoothly through the internal space, reducing eddy current losses, improving wind energy conversion efficiency, and enabling it to start up at low wind speeds.

[0014] The internal air duct rotates at a constant speed, driving the external H-shaped wind turbine blades to rotate at a controllable speed, thus achieving a stable power output. Attached Figure Description

[0015] Figure 1 Schematic diagram of the overall structure of the wind turbine blade: 1. Upper end cover, 2. Vertical shaft, 3. Tension rod, 4. External H-shaped wind turbine blade, 5. Internal wind tunnel, 6. Lower end cover;

[0016] Figure 2 A schematic diagram of the internal ventilation duct. Detailed Implementation

[0017] 1. Internal air duct and impeller blades

[0018] The internal wind tunnel features a cylindrical structure made of one of the following materials: aluminum alloy, composite materials, basalt, or carbon fiber, to reduce weight while ensuring strength. Inside the wind tunnel are two sets of helical wind turbine blades that rotate around a vertical axis, resembling a spiral staircase with a continuous and smooth curved surface. The helical blades rotate gradually from bottom to top along the vertical axis, forming a three-dimensional helical structure. These blades are made of one of the following materials to improve strength and corrosion resistance. The helical blade design allows wind power to more effectively drive the blades, thereby improving wind energy utilization.

[0019] 2. Top cap and bottom cap

[0020] The upper and lower end caps are used to seal the top and bottom of the internal air duct and are connected to the vertical shaft. The end caps are made of aluminum alloy and precision-machined to ensure a tight fit with the internal air duct. The upper and lower end caps are secured to the internal air duct with multiple bolts to ensure structural stability.

[0021] 3. External H-shaped wind turbine blades

[0022] The external H-shaped rotor blades consist of three or five blades, each secured to the upper and lower end caps by tension rods. These blades are made of one of the following materials: aluminum alloy, composite materials, basalt, or carbon fiber, offering high strength and lightweight characteristics. The H-shaped design increases the surface area of ​​the blades, enhancing wind energy capture capabilities.

[0023] 4. Tension bar and vertical shaft

[0024] The tension rod is used to connect the external H-shaped rotor blades to the upper and lower end covers, ensuring that the blades do not detach during operation. The tension rod is made of steel and connected to the vertical shaft using high-strength bolts or welding. The vertical shaft is mounted on the upper and lower end covers using precision bearings to reduce friction and improve rotational efficiency.

[0025] 5. Assembly process

[0026] First, the inner wind tunnel is bolted to the upper and lower end covers. Then, the two sets of spiral impeller blades are installed inside the inner wind tunnel and adjusted to the appropriate positions. Next, the outer H-shaped impeller blades are secured to the upper and lower end covers using tension rods, which are then connected to the vertical shaft. Finally, the entire assembly is installed in the designated location and tested to ensure it functions correctly.

Claims

1. A wind turbine blade structure for a vertical axis wind turbine, characterized in that: The structure includes an upper cover (1), a vertical shaft (2), a tension rod (3), an external H-shaped wind turbine blade (4), an internal wind duct (5), and a lower cover (6). The internal wind duct (5) is fixedly connected to the upper cover (1) and the lower cover (6) by bolts. The upper cover (1) and the lower cover (6) are connected to the vertical shaft (2) by bolts or fasteners. The tension rod (3) is connected to the upper cover (1) and the lower cover (6) by high-strength bolts or welding. The internal wind duct (5) uses two sets of wind turbine blades arranged in a spiral shape and rotating around the vertical axis. Its shape is similar to a spiral staircase with a continuous and smooth curved surface. The spiral blades rotate gradually from the bottom to the top along the vertical axis to form a three-dimensional spiral structure. The number of external H-shaped wind turbine blades (4) is three or five. Each blade is fixed to the middle upper cover (1) and lower cover (6) by the tension rod (3).

2. The wind turbine blade structure of a vertical axis wind turbine according to claim 1, characterized in that: The internal wind tunnel (5) and the wind turbine blades and the external H-shaped wind turbine blades (4) are made of one of the following materials: aluminum alloy, composite material, basalt material, or carbon fiber material.

Images