# US 11,028,856 B2 · Centrifugal compressor impeller

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 11,028,856 B2
- Document ID: US11028856B2
- Status: Granted
- Kind: B2
- Application number: 16/086,238
- Filed: 2017-04-07
- Published: 2020-12-10
- Granted: 2021-06-08
- Earliest claimed: 2016-05-09
- Assignees: IHI Corporation
- Applicants: IHI Corporation
- Inventors: Takuro Kiriaki; Soumya Dutta
- Web page: https://patentgrep.com/patent/US11028856B2

## CPC

- F04D 29/30: Vanes
- F04D 29/284: {for compressors}
- F04D 29/666: {by means of rotor construction or layout, e.g. unequal distribution of blades or vanes}
- F04D 17/10: for compressing or evacuating
- F04D 29/4213: {suction ports}
- F04D 29/444: {Bladed diffusers}
- F05D 2240/304: related to the trailing edge of a rotor blade
- F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02)
- F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS

## Abstract

Provided is a centrifugal compressor impeller that includes: a hub; a plurality of full blades that are arranged on the hub in a circumferential direction of rotation; and splitter blades provided between the full blades. There is a line-of-sight direction which is a direction parallel to a virtual plane perpendicular to a rotation axis and in which an entire suction surface of the full blade adjacent to a front side of the splitter blade in a rotational direction, an entire pressure surface of the full blade adjacent to a rear side of the splitter blade in the rotational direction, and an entire surface of the splitter blade are visible.

## Claims

### Claim 1

A centrifugal compressor impeller comprising:
a hub;
a plurality of full blades that are arranged on the hub in a circumferential direction of rotation; and
splitter blades provided between the full blades,
wherein there is a line-of-sight direction which is a direction parallel to a virtual plane perpendicular to a rotation axis and in which an entire suction surface of the full blade adjacent to a front side of the splitter blade in a rotational direction, an entire pressure surface of the full blade adjacent to a rear side of the splitter blade in the rotational direction, and an entire surface of the splitter blade are visible, and
when the sum of the number of full blades and the number of splitter blades is defined as N, an opening angle of the full blade is defined as α, and an opening angle of the splitter blade is defined as β, α≤(360°/N)+β.

### Claim 2

A centrifugal compressor impeller comprising:
a hub;
a plurality of full blades that are arranged on the hub in a circumferential direction of rotation; and
splitter blades provided between the full blades,
wherein there is a line-of-sight direction which is a direction parallel to a virtual plane perpendicular to a rotation axis and in which an entire surface of the splitter blade is visible, and
when the sum of the number of full blades and the number of splitter blades is defined as N, an opening angle of the full blade is defined as α, and an opening angle of the splitter blade is defined as β, α≤(360°/N)+β.

### Claim 3

A centrifugal compressor impeller comprising:
a hub;
a plurality of full blades that are arranged on the hub in a circumferential direction of rotation; and
splitter blades provided between the full blades,
wherein there is a line-of-sight direction which is a direction parallel to a virtual plane perpendicular to a rotation axis and in which an entire suction surface of one full blade, an entire pressure surface of another full blade adjacent to the suction surface, and an entire surface of the splitter blade are visible, and
when the sum of the number of full blades and the number of splitter blades is defined as N, an opening angle of the full blade is defined as α, and an opening angle of the splitter blade is defined as β, α≤(360°/N)+β.