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1. (WO1979000958) AERATION PROPELLER AND APPARATUS
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1979/000958 International Application No.: PCT/US1979/000224
Publication Date: 15.11.1979 International Filing Date: 10.04.1979
IPC:
B01F 3/04 (2006.01) ,C02F 3/20 (2006.01) ,B01F 7/00 (2006.01)
B PERFORMING OPERATIONS; TRANSPORTING
01
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
F
MIXING, e.g. DISSOLVING, EMULSIFYING, DISPERSING
3
Mixing, e.g. dispersing, emulsifying, according to the phases to be mixed
04
gases or vapours with liquids
C CHEMISTRY; METALLURGY
02
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
F
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
3
Biological treatment of water, waste water, or sewage
02
Aerobic processes
12
Activated sludge processes
20
using diffusers
B PERFORMING OPERATIONS; TRANSPORTING
01
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
F
MIXING, e.g. DISSOLVING, EMULSIFYING, DISPERSING
7
Mixers with rotary stirring devices in fixed receptacles; Kneaders
Applicants:
Inventors:
Priority Data:
89898321.04.1978US
Title (EN) AERATION PROPELLER AND APPARATUS
(FR) HELICE ET APPAREIL D"AERATION
Abstract:
(EN) An apparatus (10, 212) for mixing a gas and a liquid is disclosed. The apparatus is comprised of a hollow outer housing (22) and a hollow inner tube (24) received for rotary motion within the outer housing (22). A motor (61) is attached to the outer housing (22) adjacent a first end thereof and is drivingly coupled to a first end of the inner tube (24). The inner tube (24) has a support tube (214) which extends beyond the second end of the outer housing (22). Propeller blades (216) are attached to the support tube (214) for rotation therewith. An inlet (82) is formed in the inner tube (24) for admitting a gas to the hollow interior of the inner tube (24). The support tube (214) has a diffusion section (222) that extends below the propeller blades (216). The propeller mechanism (210), which includes the support tube (214) and the blades (216), is designed to increase the oxygen transfer efficiency of the apparatus (10, 212) over that provided by a standard marine propeller (48). Each propeller blade (216) has an impelling surface (232) with a varying rake which changes to a more positive rake from a leading end (226) to a tail end (228) of each propeller blade (216). Plates (238, 240, 242) are attached to the air outlet end (224) of the support tube (214). Lower portions (250) of the plates (240, 242) are bent backward in the direction in which the propeller mechanism (210) is to be rotated.
(FR) Appareil (10, 212) de melange d"un gaz et d"un liquide. L"appareil comprend un carter externe creux (22) et un tube interne creux (24) loge en rotation dans l"enveloppe ou carter externe (22). Un moteur (61) est fixe au carter externe (22) adjacent a une premiere extremite du carter externe, et il est accouple a une premiere extremite du tube interne (24) pour l"entrainement de ce dernier. Le tube interne (24) possede un tube de support (214) qui se prolonge au-dela de la seconde extremite du carter externe (22). Des pales d"helice (216) sont fixees sur le tube de support (214) pour leur rotation. Une admission est formee dans le tube interne (24) pour l"entree d"un gaz a l"interieur du tube interne (24). Le tube de support (214) possede une section de diffusion (222) qui se prolonge en-dessous des pales d"helice (216). Le mecanisme propulseur a helice (210), qui comprend le tube de support (214) et les pales (216), est concu pour augmenter le rendement du transfert d"oxygene de l"appareil (10, 212) par rapport a celui d"un mecanisme propulseur naval de type standard. Chaque pale d"helice (216) a une surface impulsive (232) avec une inclinaison variable qui change vers une inclinaison plus positive a partir d"un bord d"attaque (226) vers un bord de fuite (228) de chaque pale d"helice (216). Des plaques (238, 240, 242) sont fixees a l"extremite de sortie d"air (224) du tube de support (214). Des parties inferieures (250) des plaques (240, 242) sont pliees en arriere dans le sens de rotation du mecanisme propulseur (210).
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)