# US 2019/0170155 A1 · Dual impeller

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- Number: US 2019/0170155 A1
- Document ID: US20190170155A1
- Status: Published application
- Kind: A1
- Application number: 15/830,196
- Filed: 2017-12-04
- Published: 2019-06-06
- Earliest claimed: 2017-12-04
- Assignees: Hanwha Power Systems Co., Ltd
- Applicants: Hanwha Power Systems Co., Ltd
- Inventors: Robert Pelton; Karl Wygant
- Web page: https://patentgrep.com/patent/US20190170155A1

## CPC

- F04D 29/286: {multi-stage rotors}
- F04D 17/12: Multi-stage pumps
- F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02)

## Abstract

A dual impeller includes: a hub configured to rotate about a rotation axis; a plurality of first blades which are disposed on a first surface of the hub along a circumferential direction of the hub; a first shroud which is mounted on the plurality of first blades to cover the plurality of first blades; and a plurality of second blades which are disposed on a first surface of the first shroud along a circumferential direction of the first shroud.

## Claims

### Claim 1

A dual impeller comprising:
a hub configured to rotate about a rotation axis;
a plurality of first blades which are disposed on a first surface of the hub along a circumferential direction of the hub;
a first shroud which is mounted on the plurality of first blades to cover the plurality of first blades; and
a plurality of second blades which are disposed on a first surface of the first shroud along a circumferential direction of the first shroud.

### Claim 2 (depends on 1)

The dual impeller of claim 1, further comprising a second shroud which is mounted on the plurality of second blades to cover the plurality of second blades.

### Claim 3 (depends on 2)

The dual impeller of claim 2, further comprising:
a plurality of first flow paths defined by the hub, the plurality of first blades and the first shroud, and
a plurality of second flow paths defined by the first shroud, the plurality of second blades and the second shroud are formed.

### Claim 4 (depends on 3)

The dual impeller of claim 3, wherein inlets of the plurality of first flow paths and inlets of the plurality of second flow paths are disposed at an end of the hub, and
wherein outlets of the plurality of first flow paths and outlets of the plurality of second flow paths are open in a radial direction of the dual impeller.

### Claim 5 (depends on 4)

The dual impeller of claim 4, wherein the inlets of the plurality of first flow paths and the inlets of the plurality of second flow paths are open in a direction parallel to the rotation axis.

### Claim 6 (depends on 4)

The dual impeller of claim 4, wherein the outlets of the plurality of first flow paths and the outlets of the plurality of second flow paths are open radially along the circumferential direction of the hub.

### Claim 7 (depends on 4)

The dual impeller of claim 4, wherein the outlets of the plurality of first flow paths are disposed farther from the end of the hub than the outlets of the plurality of second flow paths along the direction parallel to the rotation axis.

### Claim 8 (depends on 4)

The dual impeller of claim 4, wherein the inlets of the plurality of first flow paths surround the end of the hub.

### Claim 9 (depends on 8)

The dual impeller of claim 8, wherein the inlets of the plurality of second flow paths surround the plurality of first flow paths.

### Claim 10 (depends on 9)

The dual impeller of claim 9, wherein the inlets of the plurality of first flow paths and the inlets of the plurality of second flow paths form concentric circles.

### Claim 11 (depends on 3)

The dual impeller of claim 3, wherein the plurality of first flow paths have a first operation region, and the plurality of second flow paths have a second operation region.

### Claim 12 (depends on 11)

The dual impeller of claim 11, wherein the first operation region is a first speed operation region and the second operation region is a second speed operation region, the second speed being faster than the first speed.

### Claim 13 (depends on 1)

The dual impeller of claim 1, wherein a number of the plurality of first blades and a number of the plurality of second blades are different from each other.

### Claim 14 (depends on 13)

The dual impeller of claim 13, wherein the number of the plurality of first blades is greater than the number of the plurality of second blades.

### Claim 15 (depends on 1)

The dual impeller of claim 1, wherein the plurality of second blades are provided farther away from the rotation axis than the plurality of first blades.

### Claim 16 (depends on 1)

The dual impeller of claim 1, wherein a first angle formed between adjacent first blades and a second angle formed between adjacent second blades are different from each other.

### Claim 17 (depends on 16)

The dual impeller of claim 16, wherein the second angle formed between the adjacent second blades is larger than the first angle formed between the adjacent first blades.

### Claim 18 (depends on 1)

The dual impeller of claim 1, wherein adjacent first blades are spaced apart from each other by a first predetermined distance, and
wherein adjacent second blades are spaced apart from each other by a second predetermined distance different from the first predetermined distance.

### Claim 19 (depends on 3)

The dual impeller of claim 3, wherein in response to a surge occurring in the plurality of second flow paths, a fluid is compressed in the plurality of first flow paths for the dual impeller to operate without effects of the surge.

### Claim 20 (depends on 3)

The dual impeller of claim 3, wherein in response to a choke occurring in the plurality of first flow paths, a fluid is compressed in the plurality of second flow paths for the dual impeller to operate without effects of the choke.