Centrifugal compressors
AssigneeCompair Industrial Limited
InventorEric John Poole
Life of this patent
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Abstract
A centrifugal compressor has at least one stage with its own impeller shaft and a gear train for driving the impeller shaft. The gear train includes a plurality of meshing parallel shaft gears comprising two input gears either of which can receive drive from a prime mover. The ratio of the number of teeth of the input gears is such that the relative shaft speeds of the input gears are 5n: 6N where n is 1 or 2 and N is 1 or 2.
Claims4
In combination with an electrical motor means operating as a 2 pole or 4 pole in the range of 50 Hz to 60 Hz for driving a two-stage centrifugal compressor with said stages having parallel impeller shafts and a centrifugal impeller mounted on each shaft;
- a gear train for driving the impeller shafts which gear train includes gears mounted on each of the impeller shafts parallel to each other and intermeshing rotatably disposed input gears in mesh with the gears on the impeller shafts, either of said input gears being adapted to receive drive from said motor means, the ratio of the number of teeth of the input gears being such that the relative shaft speeds of the input gears are 5n :
- 6N where n is 1 or 2 and N is 1 or 2 whereby the input gears will rotate at the same speeds whether a 2 pole or 4 pole 50 Hz or 2 pole or 4 pole 60 Hz motor means is being used so that the rotational speeds of the impeller shafts will be the same.
Dependencies are inferred from the claim text.