Patent ID: 8398375
Filing Date: 2013-03-19
Classification: F04D

Abstract:
1. An impeller of a pump comprising: a cylindrical boss to which a rotational force of a motor is transmitted; a hub in a substantially cone shape; a joint portion of the hub and an end face or an outer surface of the cylindrical boss joined by welding; and a plurality of blades attached to the outer surface of the hub by welding, wherein a plate for reinforcement is arranged at the joint portion of the hub and the cylindrical boss while being welded to an inner surface of the hub and the outer surface of the cylindrical boss, wherein the plate is welded nearer to the joint portion of the hub and the cylindrical boss relative to a position of a base portion of a leading edge of the blade attached to the outer surface of the hub, and the welded position of the plate and the inner surface of the hub and the base portion of the blade on the outer surface of the hub are not overlapped with each other on the inner and outer surfaces of the hub.