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US 2020/0003455 A1Published application
Variable stage compressors
AssigneeDanfoss A/S
InventorsTianlei Li, Zili Sun, Lin Sun
Life of this patent
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Abstract
A centrifugal compressor includes a first stage and a second stage. At least one of the first stage and the second stage includes an impeller and a shroud spaced from the impeller and configured to guide a fluid flow through the impeller. The shroud is selectively moveable between an engaged position and a disengaged position.
Claims13
A centrifugal compressor, comprising:
- a first stage;
- and
- a second stage, wherein at least one of the first stage and the second stage includes an impeller and a shroud spaced from the impeller and configured to guide a fluid flow through the impeller, wherein the shroud is selectively moveable between an engaged position and a disengaged position.
A method of compressing a refrigerant in a centrifugal compressor, the method comprising:
- determining an efficiency of a first stage of a compressor and an efficiency of a second stage of a compressor;
- and
- disengaging one of the first stage and the second stage based on the determining by moving a shroud away from an impeller.
A refrigerant cooling system, comprising:
- a main refrigerant loop in communication with a compressor, a condenser, an evaporator, and an expansion device;
- the compressor comprising
- a first stage;
- and
- a second stage, wherein at least one of the first stage and the second stage includes an impeller and a shroud spaced from the impeller and configured to guide a fluid flow through the impeller, wherein the shroud is selectively moveable between an engaged position and a disengaged position.
2 more elements
Dependencies are inferred from the claim text.