Wind wheel with adjustable blade number and working method thereof

Abstract

The invention discloses a wind wheel with the adjustable blade number and a working method thereof. The wind wheel mainly comprises fixed blades, a fixed hub, adjustable blades, an adjustable hub, a main shaft, a control device, a supporting rod, a hub axial fixing rod, a hydraulic locking pin shaft and pin holes, wherein the fixed blades are fixed outside the fixed hub, and the fixed hub is fixedon the end surface of the main shaft; the adjustable blades are connected with the adjustable hub through bolt connecting structures, and a first motor is used for driving a driving gear and a drivengear to rotate and driving the adjustable blades to rotate around a screw; the adjustable hub is connected with the main shaft through a spline structure; the hub axial fixing rod is connected with the hydraulic locking pin shaft and the pin holes, so that the axial fixation of the adjustable hub is realized; and the control device drives a gear to rotate through a second motor, the movement of the control device in the horizontal direction is realized, and the third motor drives the supporting rod to rotate and is used for being connected with the hub supporting hole. The number of the blades of the wind wheel can be adjusted according to the change of the external wind speed of a wind turbine generator, and the power generation capacity of the wind turbine generator is maximized.

Description

technical field [0001] The invention belongs to the technical field of wind power generation, and in particular relates to a wind wheel with an adjustable number of blades and a working method thereof. Background technique [0002] With the rapid development of the wind power industry, the scale and number of domestic wind farms have also increased rapidly. In recent years, areas with good wind resources such as Inner Mongolia, Gansu, and Xinjiang have gradually been used up. At present, most newly-built wind farms have poor wind resources and low annual average wind speed. The utilization rate of wind energy is often increased by increasing the length of the blades to increase the sweeping area of ​​the wind rotor, so as to obtain a higher utilization rate of wind energy as much as possible. [0003] However, blindly increasing the length of the blades to improve the utilization rate of wind energy has a large equipment safety hazard. In recent years, unsafe incidents of l...

AI Technical Summary

Problems solved by technology

[0003] However, blindly increasing the length of the blades to improve the utilization rate of wind energy has a large equipment safety hazard. In recent years, unsafe incidents of long blades (single blade length greater than 50 meters) such as tower sweeping, breakage, and blade root bolt breakage are on the rise.

The reasons for this problem are: (1) The production process of the blade is relatively complicated. When the length of the blade increases, the difficulty of the production process will also increase, and the probability of process defects in the blade will greatly increase; (2) the blade with a length of 90m has been realized Mass production, and the longer the blade, the stronger its flexibility. When the fan is located in a complex terrain area, the deformation of the blade may exceed the design value when the wind turbulence intensity is high, and blade sweeping and fracture accidents are prone to occur; (3) the blade The increase in length is accompanied by the increase in weight of the blade, and the stress on the bolts connecting the blade to the hub will also increase during the operation of the blade, which is prone to bolt breakage and affects the safe operation of the blade and the whole machine

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