Low-lift high-flow reversible tubular pump with asymmetric SX type blades

Abstract

The invention relates to a low-lift high-flow reversible tubular pump with asymmetric SX type blades. The low-lift high-flow reversible tubular pump comprises a forward water inlet runner, a rotating wheel, a guide blade, a gear box, a reversible motor, a bulb body, a sleeve pipe and a reverse water inlet runner. The low-lift high-flow reversible tubular pump is characterized in that the rotating wheel comprises the blades, a hub and a runner cone, wherein the blades are evenly arranged on the hub in the circumferential direction, and the runner cone is arranged on the reverse sluicing side of the hub; the blades are in a spatial warping SX shape, the axial midsection wing sections of the blades are in an asymmetric S shape, the guide blade is a movable guide blade oblique relative to the spatial curved surface, and the guide blade and the rotating paddle-type blades achieve the cooperation function. According to the low-lift high-flow reversible tubular pump, the demands that the water flow in a water pumping working condition and the water flow in a power generating working condition of the reversible tubular pump are opposite and the dual working conditions of water pumping and power generating can be met by one rotating wheel are met, and it is ensured that the efficiency in the two working conditions reaches the best. The reversible tubular pump is suitable for various reversible tubular pump stations with the water table drop ranging from 2 m to 5 m, and the efficient development and utilization of water resources can be achieved.

Description

technical field [0001] The invention belongs to the technical field of fluid machinery and water conservancy and hydropower engineering equipment, in particular to a low-lift and high-flow reversible tubular flow pump with asymmetrical SX blades. Background technique [0002] With the large-scale development of hydropower resources in my country, the development of medium and high head hydropower resources with good economic indicators is close to saturation, and the development of ultra-low head runoff power stations has become a hot topic in the field of hydropower research. The well-known tubular turbine has become the first choice for the development and utilization of ultra-low head hydropower resources due to its advantages of low water head, large flow rate, high speed and high efficiency, relatively wide high-efficiency zone, compact unit structure and simple layout. type of turbine. [0003] In the South-to-North Water Diversion Project, there are many tubular pump...

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Problems solved by technology

[0006] In Yang Hongnian's article "Development of the First Domestically Made Reversible Bulb Tubular Pump Unit", he proposed a water pump model 32GWN-42 used in the South-to-North Water Diversion Project. At the same time, it also has the function of power generation, and the applicable water head range is 1.8-2.2m; however, the applicable water head range of this power generation condition is much smaller than that of the water pump working condition, and the measured efficiency of the two working conditions is very low, which seriously causes waste of high-quality water energy resources; At the same time, the runner type is a fixed paddle type, which cannot be well adapted to different flow rates, water level drops and load changes.

[0007] Chinese patent application 201110086551.0 "a six-condition two-way tidal power generation turbine" discloses a six-work-condition two-way tidal bulb tubular power generation turbine with a new guide vane profile and runner blade thickness distribution. The blades are S-shaped The blades are used to achieve high efficiency in the power generation condition of the two-way turbine, the efficiency of the forward turbine is 87.02%, and the efficiency of the reverse turbine is 78.14%. However, its main function is to realize the two-way power generation function, and there is no explanation for the working condition of the water pump

However, the water turbine and water pump of this device are two independent runners, the structure is complex, the hydraulic loss of the flow channel and the mechanical loss of the unit are large

[0010] To sum up, in order to realize the development and utilization of ultra-low head water resources on the basis of pumping stations, it is required that both the forward pumping condition and the reverse turbine working condition should have high efficiency, so as to ensure that both the water diversion demand can be met. , and can reasonably and efficiently develop ultra-low head hydropower resources, but the existing hydraulic design methods cannot meet the requirements of both

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