# US 11,111,928 B2 · Inducer and pump

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- Number: US 11,111,928 B2
- Document ID: US11111928B2
- Status: Granted
- Kind: B2
- Application number: 15/874,957
- Filed: 2018-01-19
- Published: 2018-05-24
- Granted: 2021-09-07
- Earliest claimed: 2015-09-14
- Assignees: IHI Corporation
- Applicants: IHI Corporation
- Inventors: Hiroshi Tomaru
- Web page: https://patentgrep.com/patent/US11111928B2

## CPC

- F04D 29/181: {Axial flow rotors (F04D29/185 take precedence)}
- F04D 1/025: {Comprising axial and radial stages}
- F04D 3/02: of screw type
- F04D 7/00: Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts (F04D11/005, F04D29/22 take precedence)
- F05D 2240/303: related to the leading edge of a rotor blade
- F05D 2250/292: tapered
- F05D 2250/73: asymmetric
- 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

An inducer includes a hub and a blade which radially protrudes from the hub and is helically provided. The inducer has a thick portion in which a first distance and a second distance coincides with each other in a region outside a position at which a height ratio of the blade is 0.5 while the first distance is shorter than the second distance in a region inside the position at which the height ratio of the blade is 0.5, in which the height ratio is a ratio of a distance from a connection portion between the hub and a root portion of the blade with respect to a height of the blade which is a distance from the connection portion between the hub and the root portion of the blade to a tip portion of the blade in the radial direction of the blade.

## Claims

### Claim 1

An inducer comprising:
a hub;
a blade which radially protrudes from the hub and is helically provided; and
a wedge surface which is provided on a negative-pressure surface of the blade so as to be inclined with respect to a camber line connecting intermediate points between the negative-pressure surface and a positive-pressure surface of the blade and toward a leading edge, the negative-pressure surface of the blade being a surface facing an upstream of a fluid of which a pressure is increased by the inducer,
wherein a first distance between the camber line and the leading edge coincides with a second distance between the camber line and the positive-pressure surface of the blade in a region radially outward from a position at which a height ratio of the blade is 0.5,
wherein the height ratio of the blade is a ratio of a distance from a connection portion between the hub and a root portion of the blade with respect to a height of the blade which is a distance from the connection portion between the hub and the root portion of the blade to a tip portion of the blade in the radial direction of the blade, and
wherein the inducer comprises a thick portion, in which the first distance is less than the second distance, on the positive-pressure surface of the blade in a region radially inward from the position at which the height ratio of the blade is 0.5.

### Claim 2 (depends on 1)

The inducer according to claim 1,
wherein the thick portion is integrally formed with the blade.

### Claim 3 (depends on 1)

The inducer according to claim 1,
wherein the thick portion is formed of an addition separated from the blade.

### Claim 4 (depends on 1)

The inducer according to claim 1,
wherein a parallel surface which extends from the leading edge to be parallel to the camber line and an inclination surface which connects the parallel surface and the positive-pressure surface to each other are provided on at least a positive-pressure surface side of the root portion.

### Claim 5 (depends on 2)

The inducer according to claim 2,
wherein a parallel surface which extends from the leading edge to be parallel to the camber line and an inclination surface which connects the parallel surface and the positive-pressure surface to each other are provided on at least a positive-pressure surface side of the root portion.

### Claim 6 (depends on 3)

The inducer according to claim 3,
wherein a parallel surface which extends from the leading edge to be parallel to the camber line and an inclination surface which connects the parallel surface and the positive-pressure surface to each other are provided on at least a positive-pressure surface side of the root portion.

### Claim 7 (depends on 1)

A pump comprising the inducer according to claim 1.

### Claim 8 (depends on 2)

A pump comprising the inducer according to claim 2.

### Claim 9 (depends on 3)

A pump comprising the inducer according to claim 3.

### Claim 10 (depends on 4)

A pump comprising the inducer according to claim 4.

### Claim 11 (depends on 5)

A pump comprising the inducer according to claim 5.

### Claim 12 (depends on 6)

A pump comprising the inducer according to claim 6.