Passive propeller pitch control device of straight-bladed vertical-axis wind turbine

Abstract

The invention provides a passive propeller pitch control device of a straight-bladed vertical-axis wind turbine. The passive propeller pitch control device comprises a vertically arranged main shaft, blades, support rods, a slideway, a centrifugal mass slider and springs, wherein the blades are parallel to the main shaft, and the support rods are rigidly connected with the blades and the main shaft; the slideway is arranged at one end, close to the blades, of the support rods, the centrifugal mass slider can freely slide along the slideway, the blades are connected with the centrifugal mass slider through two springs, one spring is connected with one end of the centrifugal mass slider, and the other spring is connected with the other end of the centrifugal mass slider. With increase of the rotating speed, the centrifugal mass slider slides on the slideway to provide more counter-force support for the springs, equivalently, the rigidity of the springs is increased, and accordingly, the propeller pitch angle change of the blades is constrained. The propeller pitch angle change of the blades of the turbine can be controlled, the blades cannot stall under the action of any wind force, and the wind energy utilization rate is further increased.

Description

technical field [0001] The invention belongs to the field of wind power generation, and in particular relates to a passive pitch control device for a straight blade vertical axis wind power generator. Background technique [0002] The vertical axis fan is one of the most promising new renewable energy sources at present, a collection device of wind energy, but it has not been able to occupy the mainstream of the market because of the low rate of wind energy collection. In recent years, the development potential of small vertical axis wind turbines in complex urban wind environments has made it a research hotspot again. [0003] Fans can be divided into horizontal axis fans and vertical axis fans according to their different shafts. Horizontal axis wind turbines have a short shaft, high wind energy conversion rate, and high application value. With the continuous deepening of its research, it has gradually formed However, with the rapid development of fan technology, some pro...

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Problems solved by technology

[0005] According to the existing research results, in order to solve this problem, some researchers at home and abroad have proposed to adjust the size of the pitch angle through the support member to realize the passive control of the pitch angle, but the initial installation of the pitch angle and eccentric distance will affect the result. have a great impact

Although the cam-type pitch variable structure proposed by some researchers is ingenious and can control the pitch angle accurately, the disadvantage is that a set of cams can only produce a certain pitch law, and this structure limits the direction of the incoming wind to be certain. direction

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