SCREW PROPELLER ASSEMBLY CONTAINING ONE HUB AND AT LEAST TWO BLADES Russian patent published in 2015 - IPC B01F7/00 

FIELD: engines and pumps.

SUBSTANCE: invention relates to a mixing assembly for generation and support of movement in waste water containing more or less non-filtered contaminated liquid containing solid material such as plastic material, hygienic items, fabrics, waste cloth, sand, etc., which includes a hub and at least two blades (4) that are connected in a detachable way to the above hub, with that, the rear end of the hub fits for connection to a drive shaft and therefore for being brought into rotation about an axially continued central axis. According to the invention, the hub includes socket (9) for each of at least two above said blades (4), with that, each socket (9) includes the first engagement device (10) that is axially continued, and each blade (4) includes the second engagement device (11) that is axially continued, with that, both of the above said first engagement device (10) and the above said second engagement device (11) fit for axial mutual movement of the above hub and each of the above blades (4) during attachment/removal of the screw propeller assembly, and besides, they fit for prevention of radial mutual movement of the above hub and each of the above blades (4) when the mixing assembly is in an assembled state.

EFFECT: invention provides creation of an improved screw propeller assembly that provides simple and easily accessible installation and attachment of each blade to the hub, in which bending and torsional loads on each blade are not transferred to attachment devices, by means of which blades are attached to the hub, which provides for considerable number of attachments and removals of blades without any auxiliary tools, which is not subject to risk of improper fixation of blades and therefore, it causes no imbalance of the screw propeller assembly.

10 cl, 11 dwg