Patent ID: 8109714

Claim:
A sewage pump comprising: a motor providing the power and having a central axle; a lower base with a blade chamber attached to the motor and having an inlet and an outlet defined in the lower base to communicate with the blade chamber; a water paddle disk received inside the blade chamber and mounted on the central axle of the motor; a gear ring attached to the inlet and a first wheel blade accommodated inside the gear ring and mounted on the central axle; an auxiliary blade set mounted between the water paddle disk and the first wheel blade and comprising: a stationary blade base with a through hole and attached to the lower base over the inlet; and a second wheel blade accommodated in the through hole of the stationary blade base and mounted on the central axle of the motor, thereby, the second wheel blade is driven to rotate synchronously with the water paddle disk and the first wheel blade by the central axle of the motor.