Patent ID: 8899931
Filing Date: 2014-12-02
Classification: F04D,F05D

Abstract:
1. An impeller comprising: a hub which is supported rotatably about an axis of rotation and whose diameter increases from upstream to downstream sides along a fluid flow; a plurality of impeller blades extending radially outward from an outer circumferential surface of the hub; and a shroud formed in a cylindrical shape whose diameter increases from the upstream to downstream sides along the fluid flow and joining outer circumferential ends of the plurality of impeller blades, wherein the impeller blades comprise upstream blade segments and downstream blade segments bonded by brazing at a bonding surface extending in a direction substantially perpendicular to the axis of rotation, wherein the upstream blade segments are integral with a portion of the shroud and are not integral with a portion of the hub and are welded to the hub at an inclined surface formed by the diameter increase of the hub, and wherein the downstream blade segments are integral with at least a portion of the hub.