Patent ID: 6454522
Filing Date: 2002-09-24
Classification: F04D

Abstract:
An impeller for a circumferential current pump including a motor unit section having a motor and a pump unit section operatively connected to the motor unit section through a driving shaft of the motor, the pump unit section including a pump casing, a pump cover and the impeller disposed in a space defined between the pump casing and the cover, said impeller comprising:a disc-shape member having two side surfaces and operatively connected to the motor to be rotatable; a plurality of vane grooves formed to outer peripheral end portions of both the side surfaces in a circumferential direction thereof; and a plurality of vanes arranged between the respective adjacent vane grooves along a radial direction of the disc-shape member, wherein each of said vanes has an upstream side surface and a downstream side surface in a rotating direction thereof and a center line between both these surfaces extends along a radial direction of the disc-shape member, said upstream side surface has a radially inside portion and a radially outside portion which are formed to be continuous so that said radially inside portion is in parallel to said center line and said radially outside portion is inclined forward in the rotating direction of the disc-shape member, and said downstream side surface is formed entirely to be parallel to said center line.