Multi-stage centrifugal compressors
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United States of America Patent
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Aug 18, 2015
Grant Date -
Apr 12, 2012
app pub date -
Dec 23, 2009
filing date -
Jan 30, 2009
priority date (Note) -
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Abstract
The invention relates to an improved multi-stage centrifugal compressor (10) comprising at least four centrifugal compression stages (11,12,13,14), each including an impeller. The impellers of one pair of the stages (12,13) are mounted on a first shaft (23) coupled to a first high speed direct drive motor (16), and the impellers of another pair of the stages (11,14) are mounted on a second shaft (24) coupled to a second high speed direct drive motor (15). The speed of the first and second motors is controlled by at least one drive (25) such that the impellers are all driven at the same speed.
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