Method for designing single-screw axial-flow pump impeller

Abstract

The invention provides a method for designing a single-screw axial-flow pump impeller. The method provides a design formula of the main geometric parameters of the impeller such as the diameter D1 of an impeller inlet, the diameter dh of an impeller hub, the maximum outer diameter D2max of the impeller, the inclined angle alpha2 of an outlet edge, the minimum outer diameter D2min of the impeller,the width b2 of the outlet edge and the axial length L of the impeller. By application of the impeller designed by the invention, not only is need for sewage treatment met, but also the flowing condition is improved simultaneously, and the flowing capability, no destruction and no winding of an axial flow pump are improved. Therefore, the single-screw axial-flow pump applying the impeller is especially suitable for the sewage treatment industry.

Description

technical field [0001] The invention relates to a design method of an axial flow pump impeller, in particular to a design method of a single screw axial flow pump impeller. Background technique [0002] At present, known axial flow pump impellers use airfoil blades, that is, the lift force method and the streamline method are used to design the axial flow pump blades. The airfoil blades designed by these two design methods put forward strict requirements on the working environment of the axial flow pump and the placement of the blades. That is, it can only be used to transport clean water or mild sewage. If it is used in a sewage pumping station, the water quality is complex, there is a lot of sediment, and there are many sundries. Seal failure, motor water ingress, frequent pump alarms, increased maintenance times, and even motor burnout; and if the blade placement angles are inconsistent, it will cause operating vibration, and the cavitation performance of the pump will a...

AI Technical Summary

Problems solved by technology

That is, it can only be used to transport clean water or mild sewage. If it is used in a sewage pumping station, the water quality is complex, there is a lot of sediment, and there are many sundries. If the seal fails, the motor will get water, the pump will alarm frequently, the number of maintenance will be increased, and the motor will even be burned out; if the blades are placed at different angles, it will cause vibration during operation, and the cavitation performance of the pump will also deteriorate

Therefore, axial flow pumps using airfoil blades can no longer meet the conditions for operating in complex environments

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