Tidal current double-runner combined water turbine

Abstract

The invention relates to a tidal current double-runner combined water turbine which comprises a main shaft, a front runner, a rear runner and a pipeline water guide unit. Each runner comprises an inner ring, an outer ring and blades connected between the inner ring and the outer ring, wherein the inner ring, the outer ring and the blades are all detachable. The blades are in an inclined arc shapeand a twisted shape, the front blades are evenly distributed in the plane with the main shaft as the center, the rear blades are arranged at intervals from front to back in the direction of the main shaft and arranged into a circle, and the diameter of the front runner is smaller than that of the rear runner. The pipeline water guide unit adopts a variable cross-section shape and is divided into awater inlet part and a runner part, so that the flowability of water is improved. When water impacts the blades of the front runner along the water inlet part, component force in the circumferentialdirection of the inclined arc-shaped blades enables the runner to generate rotating torque, then hydraulic power drives the rear runner to apply force to the main shaft for the second time, and the torque of the main shaft is increased. When the double runners are impacted for the first time, energy conversion accounts for about 60% of the total energy, and energy conversion for the second time accounts for about 40% of the total energy. The dynamic stability and efficiency of the water turbine can be improved by adopting a double-runner combined structure.

Description

technical field [0001] The invention relates to a hydroelectric power generation device, in particular to a tidal current double-runner combined water turbine. Background technique [0002] my country's low-head resources are nearly 200 million kilowatts (including tidal energy), and its development level is only about 10%. The general defect of existing tidal turbines is that the energy conversion efficiency is low, and a large-scale installation is required to form a power generation scale. [0003] For example, the world's first 3.4 MW large-scale ocean tidal current energy generating set officially started power generation in the Daishan sea area of ​​Zhoushan in 2016. This is independently developed and produced by my country. The world's largest tidal current energy generating set has an energy conversion efficiency of only about 25%. The Mechanics Department of Northeastern University in the United States has developed a low-head water turbine-Gorlov's turbine, which ...

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Problems solved by technology

In order to make the tubular turbine suitable for tidal current power generation, such as "a tidal current power generation device" disclosed in Chinese patent application 201710091303.2, a direction-finding hydraulic turbine unit is arranged outside the rotating shaft between the main hydraulic turbine and the sealing cover to improve The power generation efficiency of the tidal current power generation device, however, in the actual operation of the patent, when the water flow passes through the blades of the two runners, it will form a large impact on the runners and the water turbine as a whole, and the operation of the water turbine will be unstable. Issues such as shortened safe use time lead to insignificant improvement in energy conversion efficiency, resulting in unstable power generation efficiency and increased maintenance costs for turbines

The "tidal current power generation device" disclosed in Chinese patent application 201520468281.3 has multiple structures to reduce water flow resistance. The device can be assembled and replaced modularly on the water surface, and reduces maintenance and installation costs. However, when used for tidal current power generation, the efficiency is low , and have a greater impact on underwater organisms

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