U.S. Patent Specifications

An axial‐flow blower for delivering cooling air in large volume, comprising a generally cylindrical rotor and a fixed coaxial housing spaced thereabout, open at its front end for intake of air and at its rear end for discharge of air, a generally cylindrical fixed shell located within the housing as a smooth rearward continuation of said rotor, a series of angularly distributed diffuser blades connecting the housing and the interior shell and supporting the latter, journal means for the rotor carried by said shell, a coaxial annular shroud located intermediate the rotor and the housing and terminating at its rear end immediately in advance of the outer ends of said diffuser blades, a series of blower blades distributed about the space between the rotor and the shroud, and mounted upon the rotor terminating immediately in advance of the diffuser blades, a series of turbine blades distributed about the rear edge of said shroud, intermediate the shroud and the housing and immediately ahead of the diffuser blades, an annular high compression air duct formed in the housing and having an inlet for connection to a source of highly compressed air, and a series of angularly spaced rearwardly directed nozzles formed in said housing and located forwardly of said turbine blades, for discharge of air from said air duct rear‐wardly against the turbine blades and then immediately past said diffuser blades, to mingle with air discharged rearwardly through the diffuser blades from the blower blades.