Multistage pumps and compressors
AssigneeWeir Pumps Limited
InventorMichael Leslie Ryall
Life of this patent
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Abstract
A multistage pump or compressor includes a series of axial flow stages. Each stage comprises an impeller for imparting whirl to the pumped fluid in one direction and a stator including vanes for imparting whirl to the pumped fluid in the opposite direction. The stator vanes define flow passages configured such that the fluid flows through the passages at substantially constant absolute velocity. The average ratio of stage axial length to impeller diameter for each axial flow stage is less than 0.4.
Claims26
A multistage pump for pumping fluid, the pump including a series of axial flow stages, each stage comprising an impeller for imparting whirl to the pumped fluid in one direction and a stator including vanes for imparting whirl to the pumped fluid in the opposite direction, the stator vanes defining flow passages configured such that, at or near the flowrate at which stage efficiency is a maximum, the fluid flows therethrough at substantially constant absolute velocity, and the average ratio of stage axial length to impeller diameter for each axial flow stage being less than 0.4.
Dependencies are inferred from the claim text.