# US 10,865,804 B2 · Centrifugal compressor impeller

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- Number: US 10,865,804 B2
- Document ID: US10865804B2
- Status: Granted
- Kind: B2
- Application number: 15/778,057
- Filed: 2017-02-01
- Published: 2018-12-06
- Granted: 2020-12-15
- Earliest claimed: 2016-02-23
- Assignees: IHI Corporation
- Applicants: IHI Corporation
- Inventors: Chihiro Mikami; Ryuuta Tanaka
- Web page: https://patentgrep.com/patent/US10865804B2

## CPC

- F04D 29/30: Vanes
- F04D 29/284: {for compressors}
- F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02)

## Abstract

Provided is a centrifugal compressor impeller that includes blades extending from an inlet to an outlet for a fluid. Each of the blades of the impeller includes, when a distribution of blade angles of a tip is viewed in a direction in which the tip extends from a tip inlet to a tip outlet for the tip, a constant blade angle region in which the blade angles are constant. A start point on the inlet side of the constant blade angle region is set at a position spaced apart from the tip inlet.

## Claims

### Claim 1

A centrifugal compressor impeller, comprising:
blades extending from an inlet to an outlet for a fluid, wherein
each of the blades includes a tip and a distribution of blade angles of points on the tip extending from a tip inlet to a tip outlet of the tip includes a constant blade angle region in which the blade angles are substantially constant, each blade angle based on a phase difference between the tip inlet and a respective point of the points, a radius of rotation of the respective point from a rotation axis of the impeller, and a distance measured from the tip inlet to the respective point along the tip;
a start point on the inlet side of the constant blade angle region is set at a position spaced apart from the inlet;
the constant blade angle region is present within a region between a point at which a normalized meridional distance from the inlet is 0.05 m/m2 and a point at which the normalized meridional distance from the inlet is 0.40 m/m2;
the blade angle of each point within the constant blade angle region is an angle within a range of (β1±1)° when the blade angle at the start point on the inlet side is set to a blade angle (β1);
a width of the constant blade angle region is 0.05 m/m2 or more on the basis of the normalized meridional distance; and
the distribution of the blade angles has a minimal value within the constant blade angle region.