Water pump selection method for low-lift pump unit based on impeller nominal average flow speed

Abstract

The invention discloses a low-lift water pump selection method based on impeller nominal average flow speed. The method is used for water pump selection for a low-lift pump unit. The method can enable the hydraulic performance of a high-performance axial-flow pump and a tubular pump to be better, wherein the high performance axial-flow pump and the tubular pump are relatively low in specific speed. The method is more applicable to the low-lift pump unit, can comprehensively improve the hydraulic performance of the low-lift pump unit, and belongs to the technical field of hydraulic engineering pump stations. The method is characterized in that a concept of the impeller nominal average flow speed is introduced in the method; the pump selection is not restricted by the correspondence of the lift and the specific speed in a conventional water pump selection method for the low-lift pump unit, and the water pump selection for the low-lift pump unit is performed based on the adjustment of the impeller nominal average flow speed; and the diameter of a water pump impeller is properly increased and the water pump rotating speed is properly reduced, the lift and the critical cavitation allowance of a water pump high-efficiency zone are reduced, the head loss of a flow channel is reduced, and the hydraulic performance of the low-lift pump unit can be comprehensively improved. The low-lift water pump selection method can substantially improve the hydraulic performance of the large low-lift pump unit, and plays an important role in guaranteeing the stability and high operation efficiency for a low-lift pump station.

Description

technical field

[0001] The invention belongs to the technical field of water conservancy engineering pumping stations, in particular to a pump type selection method for a low-lift pump device based on the nominal average flow velocity of the impeller, which is used for the type selection of water pumps in large and medium-sized low-lift pumping stations, and can enable high-performance pumps with low specific speeds The water pump can be better and more suitable for low-lift pump devices, and achieve the goal of maximizing the hydraulic performance of low-lift pump stations. Background technique

[0002] Large and medium-sized low-head pumping stations are widely used in many fields that have a significant impact on my country's social and economic development, such as water resource allocation, agricultural irrigation and drainage, water environment management, and urban drainage. Axial flow pumps and guide vane mixed flow pumps are the core of low-head pump installations, ...

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