Impeller assembly with asymmetric concave blades

B - Operations – Transporting – 01 – F

Patent

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Details

B01F 3/04 (2006.01) B01F 7/22 (2006.01) B01F 15/00 (2006.01) B01F 7/00 (2006.01)

Patent

CA 2235045

An impeller assembly for agitating a fluid contained in a vessel and dispersing a gas introduces therein. The impeller assembly includes an impeller having a plurality of generally radially extending blades. Each of the blades includes diverging upper and lower sheet-like portions having generally radially extending leading edges. The upper and lower portions are joined to form a generally V-shaped cross-section with a trailing vertex. The width of the upper portion of each blade is greater than the width of the lower portion of the blade such that the upper portion leading edge extends forwardly of the lower portion leading edge, thus producing an upper portion overhang to capture and disperse rising gas bubbles. The impeller assembly further comprises a drive assembly for rotating the impeller assembly.

Ensemble agitateur pour agiter un fluide stocké dans un récipient et disperser un gaz introduit dans ce fluide. L'agitateur comprend plusieurs aubes s'avançant généralement dans un sens radial. Chaque aube comprend des parties stratiformes supérieure et inférieure divergentes présentant des bords d'attaque s'avançant généralement dans un sens radial. Les parties supérieure et inférieure de l'aube sont jointes de façon à former une coupe transversale ayant la forme d'un V comportant un point de fuite. La largeur de la partie supérieure de chaque aube est supérieure à la largeur de la partie inférieure de sorte que le bord d'attaque de la partie supérieure s'étend en avant du bord d'attaque de la partie inférieure afin d'obtenir un débord de la partie supérieure permettant de capturer et de disperser les bulles de gaz au cours de leur ascension. L'agitateur comprend en outre un assemblage d'entraînement qui assure sa rotation.

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