Patent ID: 9638208
Date: 2017-05-02
CPC Classifications: F04D,F05D

Claim:
1. A centrifugal compressor impeller, comprising: a plurality of full blades standing equally spaced in a circumferential direction and extending from a fluid inlet part to a fluid outlet part on a surface of a hub; and two or more splitter blades each provided to extend from a point in a flow passage formed between the full blades arranged adjacent to each other, to the outlet part, wherein the two or more splitter blades at least include a first splitter blade provided on a side nearer to a suction side of a full blade located upstream in a rotating direction of the compressor and having a length in a flow passage direction shorter than that of the upstream side full blade; and a second splitter blade provided on a suction side of the first splitter blade and having a length in the flow passage direction shorter than that of the first splitter blade, wherein leading edge portions on a shroud side of the first splitter blade and the second splitter blade are offset toward the suction side of the full blade from positions dividing a space between the full blades at equal intervals by the number of splitter blades therebetween, and wherein an offset amount of the leading edge portion at the shroud side of the second splitter blade, from a position at which the space between the full blades is divided by the second splitter blade to a position of the leading edge portion of the second splitter blade, is larger than an offset amount of the leading edge portion at the shroud side of the first splitter blade, from a position at which the space between the full blades is divided by the first splitter blade to a position of the leading edge portion of the first splitter blade.