A high lift and low noise axial flow pump

Abstract

The invention relates to a high-lift and low-noise axial-flow pump. The high-lift and low-noise axial-flow pump comprises a bent elbow type water inlet runner, an impeller, guide blades, a water outlet bent pipe and a water outlet runner, and is characterized in that the impeller comprises blades, a hub and a water guide cone; asymmetrical wing type blades are uniformly arranged on the hub in theperipheral direction; the water guide cone is arranged at the front end of the hub; and the blades are X-shaped in a space cross manner. The efficient operation range of the axial-flow pump is widened; the unit vibration and noise are reduced; and the axial-flow pump is suitable for a pump station with the higher lift change amplitude.

Description

technical field [0001] The invention belongs to the technical field of fluid machinery and water conservancy and hydropower engineering equipment, and in particular relates to a high lift and low noise axial flow pump. Background technique [0002] Axial flow pumps are the main pump type used in low head pumping stations. The axial flow pump has simple structure, flexible installation and various forms. The construction of large pumping stations in my country, especially axial flow pumping stations, has developed very rapidly in the past 20 years. It is widely used in farmland irrigation, municipal water supply and drainage, water transfer projects, power plant circulating water projects, etc. This type of pumping station is characterized by low lift, large flow rate, and high degree of informatization. It is mainly distributed in the middle and lower reaches of the Yangtze River, Dongting Lake area, Jianghan Plain, Pearl River Delta, and along the Grand Canal. According ...

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Problems solved by technology

[0003] Axial flow pumps are suitable for low head, and have the characteristics of large flow rate, small impeller diameter, and light weight. According to the design head of the water intake pumping station, axial flow pumps are generally preferred, but axial flow pumps have disadvantages when operating with small flow and high head. In the stable area, the cavitation performance is poor when operating near zero flow rate. For pumping stations with large head changes, in order to meet the high head stable operation, the average head must deviate from the high efficiency area of ​​the pump.

[0004] Chinese patent application 201610214605.X discloses an "axial flow pump", which can still operate efficiently and stably under low flow conditions. The device includes a pump casing, an impeller, and a plurality of inner walls of the pump casing that are evenly arranged in the circumferential direction at the inlet end of the impeller. When the baffle is installed at the inlet of the impeller, the saddle area of ​​the original flow-lift curve is effectively eliminated, but the size of the baffle is too large, which affects the design of the water inlet channel and increases the construction cost

[0005] Chinese patent application 201511004087.0 discloses "a high-lift axial flow pump impeller hydraulic design method", and proposes an accurate design method for the axial flow pump impeller parameter system, which solves the problems of low lift and cavitation of axial flow pumps, and extends the pump service life and maintenance cycle, but this design method does not consider the vibration, noise and narrow high-efficiency area of ​​the unit when the axial flow pump operates in the unstable region of the optimal flow rate of 65%.

[0006] To sum up, for pumping stations with large head changes, axial flow pumps need to meet the high-efficiency and stable operation under high head conditions, and the existing hydraulic design methods cannot meet this requirement

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