Horizontal-shaft tidal current energy water turbine with Fermat spiral blade

Abstract

The invention relates to a horizontal-shaft tidal current energy water turbine with a Fermat spiral blade. The horizontal-shaft tidal current energy water turbine comprises a main shaft, a case, a thrust bearing, a coupler, an electric generator, a machine frame, a base and a water guide cone. The case is supported by the machine frame and the base. The horizontal-shaft tidal current energy water turbine is characterized by further comprising the Fermat spiral blade in the shape of a two-dimensional Fermat spiral line, a cone-like hub immersed in water current and a sealing cover; the electric generator is connected with the cone-like hub through the coupler and the main shaft; the sealing cover is arranged at the joint of the main shaft and the cone-like hub; the water guide cone is arranged on the tail of the case on the rear side of the cone-like hub; the Fermat spiral blade gradually changes and stretches in the axial direction of the cone-like hub through the thrust bearing to form the spatial warping shape to be evenly distributed on the periphery of the cone-like hub to rotate at a constant speed. By means of the horizontal-shaft tidal current energy water turbine, hydraulic friction collision is greatly reduced, the inlet head loss is reduced, the energy obtaining efficiency of the water turbine is improved, and the purpose that marine fish schools smoothly pass through the water turbine is well achieved.

Description

technical field [0001] The invention belongs to the technical field of water turbine power generation, in particular to a horizontal axis tidal current energy water turbine with Fermat spiral blades. Background technique [0002] In recent years, with increasing attention to marine resources and marine rights and interests, human exploration and development of tidal current energy is gradually heating up. As an important part of ocean energy, tidal current energy has predictability, high power density and energy stability. Outstanding advantages, development and utilization have attracted much attention. [0003] The development of tidal current energy is mainly concentrated in the field of power generation technology, and the tidal current energy turbine is its core energy conversion device. According to the structural classification, the existing tidal energy turbines mainly include horizontal axis turbines, vertical axis turbines and oscillating hydrofoils. These tidal e...

AI Technical Summary

Problems solved by technology

According to the structural classification, the existing tidal energy turbines mainly include horizontal axis turbines, vertical axis turbines and oscillating hydrofoils. These tidal energy turbines have their own advantages and disadvantages. Horizontal axis turbines have relatively mature technology and high energy harvesting efficiency, but serious yaw loss ; Although the structure of the vertical axis turbine is simple and easy to maintain, it still has the problems of difficult self-starting and low efficiency; the research on the oscillating hydrofoil started relatively late and is still in the exploratory stage

At the same time, the vibration and noise of these water turbines are large, which has a certain degree of impact and damage on the marine environment on which marine organisms such as fish and cephalopods depend.

Judging from the published patented technology, it is also impossible to enter the practical stage due to the aforementioned deficiencies

[0004] Chinese patent application 201210556394.X discloses a "compound tidal energy vertical axis turbine". Although this scheme adopts an external H-shaped structure and an internal S-shaped structure, it has the advantages of fast start-up performance and good stability. Direction arrangement makes the whole machine less efficient and has a greater impact on marine life

Chinese patent application 201310291232.2 discloses "a tidal current energy harvesting turbine with variable blade posture". Too complex, poor economy, no practical value

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