Axial flow pump impeller and axial flow pump

Abstract

The invention provides an axial flow pump impeller and an axial flow pump. The axial flow pump impeller comprises a flow guide cap 1, impeller blades 2 and an impeller hub 3; the flow guide cap 1 is of a sphere local structure, the impeller hub 3 is of a circular truncated cone structure, the flow guide cap 1 is connected with the bottom of the impeller hub 3, and the generatrix of the impeller hub 3 is tangent to the contour line of the sphere local structure; the impeller blade 2 is fixed on the impeller hub 3 and comprises a blade front edge 4, a blade rear edge 5 and a blade rim 5; and theradius of a blade rim 6 is gradually increased in the liquid flow direction, the plane where the blade rim 6 is located is a circular truncated cone side face, and the generatrix of the circular truncated cone side face where the blade rim 6 is located is parallel to the generatrix of the impeller hub 3. The impeller with the gradually-changed outer diameter is adopted, the outer diameter of theinlet of the impeller is small, the axial speed of liquid flow and pump passing organisms is increased, and therefore the collision probability of the organisms and the blade front edge 4 can be reduced; and in addition, the diameter of the outlet of the impeller is kept large, and it can be guaranteed that the pump lift and efficiency meet the use requirements of a pump station.

Description

technical field [0001] The invention relates to the technical field of fluid machinery, in particular to an axial flow pump impeller and an axial flow pump. Background technique [0002] Axial flow pumps have the characteristics of large flow, low head, and high efficiency. Due to their small size and low construction cost, they are widely used in pumping station construction projects such as water diversion projects, flood control and drainage, and agricultural irrigation in my country. [0003] However, when biological resources (such as fish, shrimp, etc.) in rivers and lakes pass through the axial flow pump passively with the liquid flow, a large amount of biological damage and death often occur. On the one hand, the migration and migration of fish are hindered, and their population numbers and even the diversity of fish species are affected. For example, European eels and sticklebacks must migrate in salt water of oceans and fresh water of lakes to complete their life c...

AI Technical Summary

Problems solved by technology

However, compared with the traditional axial flow pump, the structure of the device is complex, the construction cost is high, and the transmission efficiency affects the overall operating efficiency and stability of the pump system. The leakage screen increases the flow resistance and reduces the hydraulic performance. The mesh size of the leakage screen also determined that smaller fish cannot be protected

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