Active casing treatment adapted with movable sleeve
AssigneeFord Global Technologies, LLC
InventorsDavid Hanna, Gregory McConville
Life of this patent
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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 through a casing to an impeller of a compressor, and during first conditions, actuating an actuator to adjust a movable sleeve surrounding the casing from a first position to a second position and flowing intake air through a second chamber to the impeller, the movable sleeve adjusted in both a radial direction and an axial direction via a single actuating motion of the actuator. In this way, compressor surge may be mitigated without reducing compressor efficiency at higher air flow rates.
Claims19
A method, comprising:
- flowing intake air through a casing to an impeller of a compressor;
- during first conditions, actuating an actuator to adjust a movable sleeve surrounding the casing from a first position to a second position and flowing intake air through a second chamber to the impeller, the movable sleeve adjusted in both a rotational direction and an axial direction via a single actuating motion of the actuator;
- and
- during second conditions, actuating the actuator to adjust the movable sleeve from the second position to the first position and flowing intake air from the casing through a first chamber, the first chamber circumferentially surrounding the casing and the second chamber circumferentially surrounding the first chamber.
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;
- 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;
- and
- an actuator coupled to the movable sleeve and configured to move the movable sleeve to selectively block and unblock the injection port and the bleed port, the actuator configured to move the movable sleeve both rotationally and axially in a single actuation motion.
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 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 actuator comprising a motor and a linkage, the linkage including a first branch extending through the housing and coupled to the movable sleeve;
- and
- a controller storing instructions executable to:
- actuate the actuator 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 actuator 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, and wherein when the actuator is actuated between the first position and the second position, the movable sleeve is moved both rotationally and axially.
Dependencies are inferred from the claim text.