Multi-nozzle high-efficiency large capacity inclined jet turbine

Abstract

The invention relates to an inclined jet turbine which belongs to the field of fluid machinery and is especially applicable to developing and utilizing small and medium water power resources. The inclined jet turbine comprises a diversion ring pipe, a machine shell, nozzles as well as a rotating wheel and a motor which are arranged inside the machine shell. The inclined jet turbine has the key technology that the diversion ring pipe is provided with the 2-6 nozzles which are aligned with the rotating wheel, the included angles between the nozzles and the plane of an inlet of the rotating wheelare 19-21 degrees, the jet flow inlet angle alpha 1 is 19-21 degrees, the outlet width L of the rotating wheel is increased by 25-30%, and the setting angle gamma at an outlet of the rotating wheel is 15-17 degrees. The inclined jet turbine has the advantages that the multi-nozzle inclined jet unit can be vertically or horizontally arranged; all the nozzles are in a state of hydraulic equilibriumand stably run; furthermore, the single-machine capacity is improved, the efficiency of the rotating wheel of the turbine is increased, and the problem of jet interference of the multi-nozzle turbinecan be solved.

Description

technical field [0001] The invention relates to an oblique impact water turbine, which belongs to the field of fluid machinery and is especially suitable for the development and utilization of small and medium-sized hydraulic resources. Background technique [0002] The structure of the existing traditional oblique water turbine includes a casing, a cover, a nozzle, a runner in the casing, and a motor, and the nozzle is mostly a single nozzle. The flow rate of the oblique impact turbine with a single nozzle is generally small, and the output of the single unit is small. When it is used for power generation, the number of units must be increased, which will also increase the construction cost of the power station; and at the same time, there are often 3 to 4 buckets receiving the same The jets with different nozzle flow rates make the flow around the bucket blades complicated, and the force on the root of a single bucket blade is uneven, which causes the vibration of the enti...

AI Technical Summary

Problems solved by technology

The flow rate of the oblique impact turbine with a single nozzle is generally small, and the output of the single unit is small. When it is used for power generation, the number of units must be increased, which will also increase the construction cost of the power station; and at the same time, there are often 3 to 4 buckets receiving the same The jets with different nozzle flow rates make the flow around the bucket blades complicated, and the force on the root of a single bucket blade is uneven, which causes the vibration of the entire unit

[0003] The patent document discloses a vertical annular multi-nozzle of a water turbine, which is distributed with multiple nozzles in the annular pipe; In the water distribution container, multiple nozzles are evenly distributed on the circumference of the collector. Although it realizes the design idea of ​​the multi-nozzle of the oblique impact turbine, in terms of hydraulic design, this arrangement of multi-nozzles cannot strictly guarantee the accuracy of each nozzle. The hydraulic balance relationship between them is adjusted by opening and closing each nozzle, which is not easy to ensure the hydraulic balance relationship.

The runner is the heart part of the turbine. Whether it is a collector turbine or an annular multi-nozzle, it does not match the shape of the original runner. After the number of nozzles increases, the structural arrangement is complicated, the flow of the runner increases, and the connection between the jets and the rotor There may be interference between the water flows inside the wheel, and a large number of vortices may be generated in the root area of ​​the blade and at the inlet of the blade, resulting in large hydraulic loss and low hydraulic efficiency

[0004] There are also traditional oblique impact turbines, with the increase of the output of a single unit, the structure and size are greatly restricted, so that the drainage is not smooth, and it is easy to hit the base and the cover to form a diffuse reflection; the main body of the turbine is divided into a base and a cover. Two parts, making it extremely inconvenient to disassemble and overhaul

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