Multistage centrifugal compressor.

摘要

A multistage centrifugal compressor has a shaft (1) rotatable on an axis and a plurality of centrifugal impellers (4a-d) fixed on said shaft and having outlets at their peripheries. Conduits connect the impellers to form a path for fluid undergoing multi-stage compression by said impellers from a suction side to a delivery side. The conduits including a plurality of diffusers (8a-d) arranged radially outwardly from the impellers, each impeller and its associated diffuser constituting a stage. At least two of the diffusers are vaned diffusers provided with vanes having leading edges at their inlet ends. To provide high efficiency combined with low risk of rotating stalls, among said vaned diffusers the ratio of diffuser vane leading edge radius to impeller outlet radius increases along said fluid path from the delivery side to the suction side.