An axial flow pump impeller and axial flow pump

Abstract

The invention provides an impeller of an axial flow pump and an axial flow pump. The impeller of the axial flow pump includes a diversion cap 1, impeller blades 2 and an impeller hub 3; The cap 1 is connected to the bottom of the impeller hub 3, and the generatrix of the impeller hub 3 is tangent to the outline of the local structure of the sphere; the impeller blade 2 is fixed on the impeller hub 3, and the impeller blade 2 includes a blade leading edge 4, a blade trailing edge 5 and a blade The radius of the rim 5 and the blade rim 6 gradually increases along the liquid flow direction, and the surface of the blade rim 6 is the side of the circular platform, and the generatrix of the side of the circular platform where the blade rim 6 is located is parallel to the generatrix of the impeller hub 3 . The present invention adopts the impeller with gradually changing outer diameter, and the outer diameter at the inlet of the impeller is smaller, so as to increase the liquid flow and the axial velocity of the organism passing through the pump, thereby reducing the collision probability between the organism and the leading edge 4 of the blade. In addition, the diameter of the impeller outlet is kept relatively large, which can ensure that the pump head and efficiency meet the requirements of the pumping 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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