Patent ID: 9404506
Filing Date: 2016-08-02
CPC Classification: F04D

Claim Text:
1. An impeller of a compressor, in which a direction of flow changes from an axial direction to a radial direction from an inlet in the radial direction of a fluid flow passage to an outlet in the radial direction thereof, the impeller comprising: a hub surface constituting at least a portion of the fluid flow passage; a blade surface constituting at least a portion of the fluid flow passage; a bulge that is formed at a corner where a pressure surface, which configures the blade surface, comes in contact with the hub surface in the vicinity of the inlet of the fluid flow passage; and a second bulge that bulges toward an inside of the fluid flow passage at a corner where a suction surface of a blade comes in contact with the hub surface in the vicinity of the inlet of the fluid flow passage, wherein the bulge has a curved surface smoothly protruding from a leading edge of the blade toward the inside of the fluid flow passage, the bulge having a width and a height that gradually decrease in a downstream direction of the fluid flow passage, and the bulge has a curved surface smoothly protruding from the corner where the pressure surface comes in contact with the hub surface toward the inside of the fluid flow passage, the width of the bulge gradually decreasing as extending outward in the radial direction of the fluid flow passage, and the height of the bulge gradually decreasing in the axial direction.