LOW TURBULENCE CENTRIFUGAL PUMP IMPELLER WHEREIN THE DOWNSTREAM PART OF THE BLADES EXTENDS CIRCUMFERENTIALLY

摘要

A low-turbulence impeller for a fluid pump comprises a first base wall (2), a second base wall (3), multiple guiding blades (4), multiple back-up plates (5), and multiple runners (6). The second base wall (3) has an inlet (33) formed through the second base wall (3). Each runner (6) is formed between two adjacent guiding blades (4). Each runner (6) has an outlet (60) formed between two adjacent back-up plates (5), a laminar zone (61) communicating with a corresponding outlet (60) and a turbulent zone (62) aligning with the corresponding back-up plate (5). The fluid can only be flowed out of the outlet (60) from the laminar zone (61), such that the fluid through the outlet (60) of each runner (6) is in low-turbulence condition. The cavitation corrosion is greatly reduced. The rotational velocity is enhanced to promote the fluid-draining efficiency.