Regenerative turbo machine

摘要

A regenerative fluid dynamic machine, typically a blower or exhauster, includes a rotor (21) having a set of blades (24) which are curved, and preferably of aerofoil cross-section, in a manner which causes fluid flow passing through the set of blades to be turned with respect to the blades through an angle more than 90 DEG , preferably 100 DEG to 140 DEG . The rotor is enclosed in stator structure (20) defining a toroidal passage (25) between inlet and outlet ports (26, 27) fluid flow in said passage following a path which forms a spiral centered within the cross section of the passages so that it passes through the set of blades more than once between the inlet and outlet.