Patent ID: 6071072
Filing Date: 2000-06-06
Classification: F04D

Abstract:
A self-priming centrifugal pump comprising a casing, a motor casing securely mounted in the casing, a channel defined between the casing and the motor casing, a discharge end on top of the casing and in communication with the channel, a rotor mounted within the motor casing, an axle securely mounted to the rotor and rotatably received within the casing, a first set of impellers securely connected with the axle, a hollow cylinder securely connected under the casing and having the first impeller received therein, a first tube communicating with the cylinder through an opening defined to receive the axle extending therethrough, and a supply tube connected between an inlet end of the first tube and a liquid supply; wherein the improvements comprising:a recirculation tube, a first end of which is in communication with the cylinder and has a second impeller mounted in the first end, a second end of which is in communication with the first tube.