| CPC F04D 29/4206 (2013.01) [F04D 17/08 (2013.01)] | 19 Claims |
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1. A centrifugal pump comprising:
a pump casing that includes a pump housing and a motor pot, an open end of the pump housing being joined to an open end of the motor pot, the joined pump housing and motor pot defining an interior fluid chamber, and
a rotor unit disposed in the fluid chamber, the rotor unit including a rotor of a motor and an impeller that is connected to the rotor, the rotor configured to drive the impeller to rotate about a rotational axis,
wherein
the pump housing includes
an inlet that defines a first passageway that is aligned with the rotational axis and directs fluid toward the impeller,
an outlet that defines a second passageway that is aligned with a second axis, and
a volute that is provided on an inner surface of the pump housing and that communicates with the inlet and the outlet, the volute defining a spiral fluid path that increases in cross-sectional area along the path so as to have a maximum cross-sectional area at a volute exit opening, the volute exit opening facing the outlet, the volute exit opening discharging at least a portion of the fluid along a volute discharge axis,
and wherein
the outlet is disposed downstream of the volute exit opening,
an end face of the motor pot open end defines a floor surface of the volute, the end face residing in a plane that is substantially perpendicular to the rotational axis, and
an inner surface of the outlet has a ramp configured to redirect fluid flow exiting the volute so that the redirected fluid flow is at an acute first angle relative to the plane.
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