Patent ID: 7887285
Filing Date: 2011-02-15
Classification: F04D

Abstract:
1. A pump comprising: a rotatable rotor installed in a motor part; and one or more impellers installed in a pump part, capable of being rotated together with the rotor in unison, wherein the rotor and the impellers are accommodated in a motor-side casing and a pump-side casing respectively, and each of the impellers has an inlet at an inner periphery thereof and an outlet at an outer periphery thereof, and wherein a housing including a front shroud and a rear shroud for each of the impellers is arranged at both sides of an axial direction of the impellers, an outer peripheral part of a rear-most shroud being couple to the rotor, and the outer peripheral part is projected outwards beyond a gap between an outer peripheral surface of the rotor and an inner peripheral surface of the motor-side casing, in which the rotor is rotatably accommodated, so that the outer peripheral part covers the gap, wherein the rear-most shroud includes a coupling protrusion having an end portion fixedly attached to an upper end of the rotor.