PROPELLER SCREW Russian patent published in 2015 - IPC B63H1/00 

FIELD: transport.

SUBSTANCE: screw propeller comprises hub. Screw propeller allows purposeful variation of fluid parameters at blade suction and pressure surfaces. Said hub is composed of the barrel with blades secured at its inner surface. Hub walls have rows of through holes regularly made over hub perimeter at both blade suction surface and pressure surfaces. Rows of through holes on said suction and pressure surfaces are separated and communicated with separate compressed gas sources. Drive shaft is hollow and fitted in fixed sleeve to run therein, circular groove is made on the side of said sleeve facing the hub bottom part, groove bottom is connected via hole with opposite side of said fixed sleeve. Outer surface of second sleeve is aligned with circular groove nearby drive rotational axis to make cylindrical circular groove with chamber side surface facing the latter. Circular cylindrical groove section remote from fixed sleeve is connected with clearance between second sleeve end and hub bottom part. Drive shaft cavity is connected with compressed gas first source while its end if covered by first check valve and opening in fixed sleeve is connected with compressed gas second source and closed by second check valve.

EFFECT: simplified design, enhanced performances.

2 cl, 4 dwg