Rotary kinetic fluid motors or pumps – With cutter or comminutor for debris in working fluid
Patent
1994-07-14
1996-04-02
Look, Edward K.
Rotary kinetic fluid motors or pumps
With cutter or comminutor for debris in working fluid
415206, 416244R, 416245R, F04D 704, F04D 2922
Patent
active
055035213
ABSTRACT:
A centrifugal pump assembly including a housing containing a pump impeller having an axis of rotation with an inlet opening for fluids generally aligned with the axis of rotation of the impeller and a discharge opening aligned with the periphery of the impeller. The impeller is attached to a drive shaft for rotation by means of a central hub which has at least one circumferentially extending surface having an edge projecting toward the inlet at a circumference radially spaced from the axis of rotation. The surface, which is progressively recessed away from the inlet toward the rotational axis, modifies fluid flow through the pump to reduce whirling motion in the inlet, thereby significantly improving efficiency of the pump. Preferably at least two of such surfaces of different diameters in stepped relationship are provided, each of the surfaces being raised toward the inlet at a circumference spaced from the axis of rotation and progressively being recessed away from the inlet in a direction advancing toward the axis of rotation. Both such surfaces may be provided either on the hub or on the surface of the impeller or one such surface can be located on the hub and at least one additional such surface located on the surface of the impeller blade facing the inlet.
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Lee Michael S.
Look Edward K.
Tetra Laval Holdings & Finance S.A.
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