Axial Flow Pump Features and Applications

1. Utilization and Management

Axial flow pumps are high-speed pumps with a typical speed ratio of 500 to 1000. The faster the speed, the lower the head and the greater the flow rate. Due to the steep QV-H performance curve of axial flow pumps, the valves in the discharge pipeline should not be closed during startup, otherwise the starting power will be too high, causing the motor to overload and damage. Axial flow pumps use adjustable blades to regulate flow.

2. Features and Applications

Axial flow pumps offer advantages such as high flow rate, simple structure, lightweight, compact size, and minimal land requirement. For adjustable axial flow pumps, they can still operate at high efficiency when the operating conditions change by adjusting the blade angle. However, due to the lower head, their application range is limited. To improve the head performance of axial flow pumps, they can also be made into multi-stage pumps.

Axial flow pumps typically exhibit poor cavitation performance, generally allowing only a vacuum of 4~5mH2O (40~50 kPa). Due to the inherent characteristics of axial flow pumps, high flow rate is one of their developmental directions.

Currently, our country has developed a series of large-diameter axial flow pumps, with a structural trend towards adjusting the direction of the regulating blades.