Direct drive independent variable pitch tidal current energy electric generation hydraulic turbine

Abstract

The invention provides a direct drive independent variable pitch tidal current energy electric generation hydraulic turbine. The direct drive independent variable pitch tidal current energy electric generation hydraulic turbine comprises a fairing, a wheel hub, blades uniformly arranged on the wheel hub, an electric generator and a tower. The bottoms of the bases of the blades are fixedly connected to the inner circle of an inner-tooth bearing. The outer circle of the inner-tooth bearing is fixedly connected to the wheel hub. The lower end of the inner-tooth bearing is fixedly connected to a base plate. Variable pitch motors are mounted at the lower end of the base plate. The lower end of every variable pitch motor is provided with a variable pitch motor encoder. An output shaft of every variable pitch motor penetrates through a mounting hole in the base plate and provided with a pinion in a sleeving mode. The pinion is meshed with the inner circle of the inner-tooth bearing. The middle portions of the bases of the blades are provided with blade encoders. The blade encoders are connected to the variable pitch motor encoder through wires and control circuits. The direct drive independent variable pitch tidal current energy electric generation hydraulic turbine is compact in structure, small in size and capable of timely and accurately making appropriate changes for the complex water flow direction through the design that every motor independently controls the angle of the variable pitch of every blade.

Description

technical field [0001] The invention relates to a tidal current energy generating water turbine, in particular to a direct-drive independent pitch variable tidal current energy generating hydraulic turbine. Background technique [0002] The tidal current power generation turbine is a device that uses the kinetic energy generated by the flow of seawater to drive the impeller (including blades and hub) of the unit to rotate to generate electrical energy. The research on tidal current power generation turbines in various countries began in the early 21st century. The working principle of this equipment is very similar to that of traditional wind turbines. Since the average density of seawater is about 800 times that of air, the overall size of the tidal current power generation hydro turbine unit is much smaller than that of the wind power generation unit under the condition of the same power level of the two units. [0003] Usually, the tidal current power generation turbine ...

AI Technical Summary

Problems solved by technology

This method has a simple structure, high reliability, and is easy to implement various controls. In a complex tidal energy change environment, the pitch device has high requirements for driving force and pitch angle. This form of pitch makes the blade propeller The distance angle transformation is not accurate, and the gap between the bevel gear and the vane bevel gear is not easy to adjust

Publication No. CN201410018223.0 proposes an independent pitch control system and drive device for wind turbines, using three pitch motors to drive three blades to achieve individual deflection control for each blade. It is suitable for pitch angle control of turbine blades in a complex tidal current environment, but due to the independent design of three pitch structures, the volume of the impeller hub increases, the weight increases, and the cantilever stiffness becomes weak when the unit is fixed

Secondly, the composition of the traditional tidal energy turbine results in a large unit with too long main shaft and low strength; since the turbine works underwater, it is very difficult to seal between its various parts

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