# US 2019/0170148 A1 · Active casing treatment adapted with movable sleeve

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- Number: US 2019/0170148 A1
- Document ID: US20190170148A1
- Status: Published application
- Kind: A1
- Application number: 15/832,624
- Filed: 2017-12-05
- Published: 2019-06-06
- Earliest claimed: 2017-12-05
- Assignees: Ford Global Technologies, LLC
- Applicants: Ford Global Technologies, LLC
- Inventors: Gregory McConville; David Hanna; Liangjun Hu
- Web page: https://patentgrep.com/patent/US20190170148A1

## CPC

- F04D 27/002: {by varying geometry within the pumps, e.g. by adjusting vanes}
- F02B 37/225: {air passages}
- F04D 27/0223: {Control schemes therefor}
- F04D 27/0246: {by varying geometry within the pumps, e.g. by adjusting vanes}
- F04D 29/403: {especially adapted for elastic fluid pumps}
- F04D 29/4213: {suction ports}
- F04D 29/685: {Inducing localised fluid recirculation in the stator-rotor interface}
- F02B 2037/125: {Control for avoiding pump stall or surge}
- Y02T 10/12: Improving ICE efficiencies
- F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02)
- F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G)
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

Methods and systems are provided for a compressor adapted with a movable sleeve and an active casing treatment that form separate air flow chambers. In one example, a method includes flowing intake air in a first direction through a casing to an impeller of a compressor, selectively flowing intake air from the casing through a first chamber in an opposite, second direction, the first chamber circumferentially surrounding the casing, and selectively flowing intake air in the first direction through a second chamber to the impeller, the second chamber circumferentially surrounding the first chamber. In this way, compressor surge may be mitigated without reducing compressor efficiency at higher air flow rates.

## Claims

### Claim 1

A method, comprising:
flowing intake air in a first direction through a casing to an impeller of a compressor;
selectively flowing intake air from the casing through a first chamber in an opposite, second direction, the first chamber circumferentially surrounding the casing; and
selectively flowing intake air in the first direction through a second chamber to the impeller, the second chamber circumferentially surrounding the first chamber.

### Claim 2 (depends on 1)

The method of claim 1, wherein the casing circumferentially surrounds at least part of the impeller, and wherein selectively flowing intake air from the casing through the first chamber comprises selectively flowing intake air from the casing to the first chamber via a bleed port of the casing.

### Claim 3 (depends on 2)

The method of claim 2, wherein selectively flowing intake air in the first direction through the second chamber to the impeller comprises selectively flowing intake air in the first direction through the second chamber to the impeller via an injection port of the casing.

### Claim 4 (depends on 3)

The method of claim 3, wherein selectively flowing intake air from the casing through the first chamber via the bleed port comprises actuating a movable sleeve to a first position based on a mass air flow through the casing being below a threshold mass air flow, wherein while the movable sleeve is in the first position, the bleed port is open to the first chamber.

### Claim 5 (depends on 3)

The method of claim 3, wherein selectively flowing intake air in the first direction through the second chamber to the impeller via the injection port comprises actuating the movable sleeve to a second position based on a mass air flow through the casing being above a threshold mass air flow, wherein while the movable sleeve is in the second position, the injection port is open to the second chamber.

### Claim 6

A compressor, comprising:
an impeller rotatable about a central axis and housed in a compressor housing;
a casing at least partially surrounding the impeller, the casing including an injection port and a bleed port; and
a movable sleeve circumferentially surrounding the casing and defining a first air flow chamber between an outer surface of the casing and an inner surface of the movable sleeve and a second air flow chamber between an outer surface of the movable sleeve and an inner surface of the housing, the movable sleeve configured to selectively block and unblock the injection port and the bleed port.

### Claim 7 (depends on 6)

The compressor of claim 6, wherein the casing forms an inner channel fluidically coupling an inlet of the compressor to the impeller, and wherein the bleed port fluidically couples the inner channel to the first air flow chamber and the injection port fluidically couples the inner channel to the second air flow chamber.

### Claim 8 (depends on 7)

The compressor of claim 7, wherein each of the first air flow chamber and the second air flow chamber are fluidically coupled to the inlet of the compressor.

### Claim 9 (depends on 7)

The compressor of claim 7, wherein the movable sleeve is adjustable to a first position where the bleed port is open and the injection port is blocked, fluidically coupling the inner channel to the first air flow chamber such that intake air in the inner channel flows through bleed port and to the first air flow chamber.

### Claim 10 (depends on 7)

The compressor of claim 7, wherein the movable sleeve is adjustable to a second position where the bleed port is blocked and the injection port is open, fluidically coupling the inner channel to the second air flow chamber such that intake air in the second air flow chamber flows through the injection port and to the impeller.

### Claim 11 (depends on 6)

The compressor of claim 6, wherein the bleed port is located upstream of the injection port in an intake air flow direction through the compressor.

### Claim 12 (depends on 6)

The compressor of claim 6, further comprising support ribs coupled to the movable sleeve and projecting into the first air flow chamber.

### Claim 13 (depends on 6)

The compressor of claim 6, wherein the movable sleeve includes an inwardly-curving downstream end and wherein the inwardly-curving downstream end includes a face configured to be in face-sharing contact with an outer surface of the casing.

### Claim 14 (depends on 13)

The compressor of claim 13, wherein the face of the inwardly-curving downstream end is sized to block flow through either the bleed port or the injection port.

### Claim 15 (depends on 6)

The compressor of claim 6, wherein the movable sleeve includes an inwardly-curving upstream end and wherein the inwardly-curving upstream end restricts air flowing in the first air flow chamber and directs it toward the impeller.

### Claim 16

A system, comprising:
a compressor, comprising:
a housing;
an impeller housed within the housing and rotatable about a central axis;
a casing at least partially surrounding the impeller and an forming an inner channel fluidically coupling an inlet of the compressor to the impeller, the casing including an injection port and a bleed port;
a movable sleeve circumferentially surrounding the casing;
a first air flow chamber extending along an outer surface of the casing; and
a second air flow chamber extending along an outer surface of the movable sleeve;
an actuating mechanism coupled to the movable sleeve; and
a controller storing instructions executable to:
actuate the actuating mechanism to move the movable sleeve to a first position where the bleed port is open to the first flow chamber and the injection port is blocked responsive to compressor operation in a surge region; and
actuate the actuating mechanism to move the movable sleeve to a second position where the bleed port is blocked and the injection port is open to the second air flow chamber responsive to compressor operation in a choke region.

### Claim 17 (depends on 16)

The system of claim 16, wherein the actuating mechanism includes a linkage coupling a motor to the movable sleeve, wherein the motor is positioned outside the housing and the linkage traverses through the housing.

### Claim 18 (depends on 16)

The system of claim 16, wherein the bleed port is positioned in the casing upstream of the injection port in an intake air flow direction through the inner channel.

### Claim 19 (depends on 18)

The system of claim 18, wherein the injection port is positioned in the casing at a low-pressure region such that intake air in the second chamber flows through the injection port and to the impeller when the movable sleeve is in the second position.

### Claim 20 (depends on 19)

The system of claim 19, wherein the bleed port is positioned in the casing at a higher-pressure region such that intake air in the inner channel flows through the bleed port and to the first chamber when the movable sleeve is in the first position.