EP 1581745 A2 20051005 - SURFACE AERATION IMPELLERS
Title (en)
SURFACE AERATION IMPELLERS
Title (de)
LAUFRûDER FÜR EINE OBERFLûCHENBEL FTUNG
Title (fr)
ROTORS D'AERATION DE SURFACE
Publication
Application
Priority
US 0229280 W 20020916
Abstract (en)
[origin: CA2499051A1] A surface aeration impeller for use in a liquid filled tank. The impeller is rotatable about an axis perpendicular to the static liquid surface. The impeller has a plurality of blades mounted on the underside of a disc or dis c- like surface. Each blade has a multi-faceted or curved geometry ranging from vertical at the point of attachment to the disc to partially inclined at the bottom. The blades are spaced circumferentially about the axis and are disposed at acute angles to radial lines from the axis of rotation of the impeller. The lower portions of the blades, which are inclined but non- vertical, are positioned at or below the static liquid surface. When the impeller is rotated, the lower portion pumps the liquid up onto the vertical portion of the blades where the liquid is discharged into a spray umbrella i n a direction upwardly and outwardly away from the impeller. The design of the invention produces substantially higher oxygen transfer efficiency and overa ll liquid pumping rates than prior art designs and is particularly useful in th e aeration of sewage and other wastewater.
IPC 1-7
IPC 8 full level
B01F 27/906 (2022.01); F04D 1/00 (2006.01); F04D 29/22 (2006.01); F04D 29/30 (2006.01)
CPC (source: EP)
B01F 23/234211 (2022.01); F04D 29/2261 (2013.01)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR
DOCDB simple family (publication)
AU 2002365076 A1 20040430; AU 2002365076 B2 20081218; CA 2499051 A1 20040325; CA 2499051 C 20100601; EP 1581745 A2 20051005; EP 1581745 A4 20101215; JP 2006503687 A 20060202; MX PA05002888 A 20051005
DOCDB simple family (application)
AU 2002365076 A 20020916; CA 2499051 A 20020916; EP 02802924 A 20020916; JP 2004535370 A 20020916; MX PA05002888 A 20020916