Patent ID: 7357341
Filing Date: 2008-04-15
Classification: E03F,F04D

Abstract:
1. A sewage grinder pump comprising: a motor housing; a pump housing, having an inlet communicated to a first stage volute, a discharge of the first stage volute communicated through an inter-stage conduit to an inlet of a second stage volute and a discharge of the second stage volute communicated to an outlet; a motor enclosed within the motor housing, the motor having a shaft extending therefrom into the pump housing; first and second stage centrifugal impellers positioned in the respective first and second stage volutes, each of the centrifugal impellers attached to the motor shaft between the motor and the grinder; and a grinder positioned in the pump housing inlet and attached to the motor shaft, the grinder and the centrifugal impellers having a common axis of rotation inside the pump housing.