Pumps – Motor driven – Motor within rotary pumping member
Patent
1981-12-29
1984-11-13
Casaregola, Louis J.
Pumps
Motor driven
Motor within rotary pumping member
415182, F04D 2952
Patent
active
044823029
ABSTRACT:
The cross-sectional area of the airflow duct on at least one face of the fan housing is larger than the cross-sectional area of a cylindrical portion of duct which cooperates with the impeller. A junction portion having an S-shaped cross-section in an axial plane is provided on at least part of the duct periphery between the cylindrical portion and that housing face. The fan duct progressively increases in width from the cylindrical portion to the housing face and the S-shaped junction portion has a point of inflection substantially at the midpoint of its axial length. A reduction in noise level is thus achieved during operation of the fan.
REFERENCES:
patent: 2735611 (1956-02-01), McLean
patent: 2926838 (1960-03-01), Van Rijn
patent: 3237849 (1966-03-01), Krell
patent: 3362627 (1968-01-01), Papst
patent: 3644066 (1972-02-01), Heob et al.
patent: 4167376 (1979-09-01), Papst
patent: 4221546 (1980-09-01), Papst et al.
patent: 4345874 (1982-08-01), Ozeki et al.
Casaregola Louis J.
Etudes Techniques et Representations Industrielles E.T.R.I.
Simenauer Jeffrey A.
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