A wind wheel system with blade offset and a two-blade wind turbine

Abstract

The utility model discloses a kind of wind wheel system and two-blade wind turbine of blade offset, including hub and two branch blades, two branch blades are about the center of hub 180 degree rotation symmetry distribution, and the center line of two branch blades all do not pass through hub center, the center line of each branch blade keeps eccentric distance S with the center line of hub respectively. The utility model can effectively solve the problem that two-blade wind turbine is affected by tower shadow effect and gravity center over vertical plane brings fan swing vibration.

Description

Technical Field

[0001] This utility model relates to the technical field of wind turbines, and in particular to a blade-biased wind turbine system and a two-bladed wind turbine. Background Technology

[0002] The wind turbine system, consisting of blades and a hub, is a key component of a wind turbine generator. It captures wind energy and converts it into rotational mechanical energy, which is then transmitted to the gearbox generator via the hub's connection to the main shaft to generate electricity. Wind turbine systems come in two-blade and three-blade configurations, with the two-blade configuration featuring two blades arranged symmetrically along the hub's centerline. However, in this two-blade system, when the blades rotate to a position perpendicular to the ground and pass over a vertical plane, the tower experiences swaying vibrations, severely affecting the turbine's stable and safe operation. This is primarily due to the combined effects of the tower's shadow (caused by the wind) and the shift in the blade's center of gravity as it moves left and right along the vertical line, resulting in lateral swaying vibrations of the tower.

[0003] Currently, one method to reduce vibration is to add a tuned damper (TMD) to the tower to suppress tower vibration. This approach is effective in suppressing tower vibration, but the tuned damper has a complex structure, is difficult to install and debug, and increases costs. Another method is to use single-blade pitch control to reduce vibration, but this method requires sensor and control support, has complex algorithms, requires individual parameter debugging for each unit, and increases the operating frequency and time of the pitch system, reducing its lifespan and reliability. It may even conflict with the tower blade load reduction strategy. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a wind turbine system with offset blades, which can effectively solve the problems of wind turbine swaying and vibration caused by the tower shadow effect and the center of gravity passing through the vertical plane in two-bladed wind turbines.

[0005] Another objective of this invention is to provide a two-bladed wind turbine.

[0006] The objective of this utility model can be achieved by adopting the following technical solutions:

[0007] A wind turbine system with offset blades includes a hub and two blades. The two blades are symmetrically distributed about 180 degrees about the center of the hub, and the centerlines of the two blades do not pass through the center of the hub. The centerline of each blade is eccentrically offset from the centerline of the hub by a distance S.

[0008] Furthermore, the centerline of the blade is an extension of the axis of rotation of the blade root.

[0009] Another objective of this utility model can be achieved by adopting the following technical solution:

[0010] A two-bladed wind turbine includes the aforementioned blade-biased rotor system.

[0011] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0012] This invention features a simple structure, low cost, and high reliability. By offsetting the blades, the blades pass through the tower segment by segment during rotation, thereby reducing the wind load variation on the blades caused by the tower. Simultaneously, this installation method avoids the blade's center of gravity and the blade itself passing through the tower simultaneously, reducing tower swaying and vibration, thus ensuring the safe and stable operation of the wind turbine system. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the wind turbine system with offset blades according to this utility model.

[0014] Figure 2 This is a schematic diagram of the structure of the blade of this utility model rotated to be perpendicular to the ground.

[0015] Figure 3 This is a schematic diagram of the structure of the blades of this utility model passing through the tower section by section. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the protection scope of this utility model.

[0017] Example 1:

[0018] like Figures 1 to 3 As shown, this embodiment provides a wind turbine system with offset blades, including a hub 1 and two blades 2. The two blades 2 are symmetrically distributed about the center 101 of the hub 1 at a 180-degree rotational angle, and the center lines 201 of the two blades 2 do not pass through the center 101 of the hub 1. The center line 201 of the blade 2 is the extension of the rotation center axis through the blade root. In this embodiment, the center of gravity of the blade 2 is not on its center line 201, and the center line 201 of each blade 2 maintains an eccentricity S with the center line of the hub 1.

[0019] This embodiment uses an offset installation of the blades, allowing them to pass through the tower segment by segment during rotation, thereby reducing the wind load variation on the blades caused by the tower. Simultaneously, this installation method avoids the blade's center of gravity and the blade itself passing through the tower simultaneously, reducing tower swaying vibration and thus ensuring the safe and stable operation of the wind turbine system.

[0020] Example 2:

[0021] This embodiment provides a two-bladed wind turbine, including the blade-biased rotor system described in Embodiment 1.

[0022] The above description is only a preferred embodiment of this utility model patent, but the protection scope of this utility model patent is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the scope disclosed in this utility model patent, based on the technical solution and utility model patent concept of this utility model patent, shall fall within the protection scope of this utility model patent.

Claims

1. A wind turbine system with offset blades, characterized in that: It includes a hub and two blades. The two blades are symmetrically distributed about 180 degrees about the center of the hub, and the center lines of the two blades do not pass through the center of the hub. The center line of each blade is eccentrically S from the center line of the hub.

2. The blade-biased wind turbine system according to claim 1, characterized in that: The centerline of the blade is the extension of the axis of rotation of the blade root.

3. A two-bladed wind turbine, characterized in that: The wind turbine system with blade offset as described in any one of claims 1 to 2.

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