Multi-bladed propeller and shaft assembly

Fluid reaction surfaces (i.e. – impellers) – With fluid passage in working member communicating with... – Air and watercraft propellers

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Details

416 93A, 137580, F01D 136, F03B 500

Patent

active

046436421

ABSTRACT:
A multi-bladed propeller and shaft assembly is provided in which air can be fed to the propeller blades to reduce the effects of cavitation. A shaft leads to a multi-bladed propeller and carries a sleeve formed with inlet passages and axial and radial passages leading to the respective blades. A slip ring supported in an anti-rotation device allows the shaft sleeve to rotate within axially spaced bearings of the slip ring. Axially spaced air seals together define with the body of the slip ring an annulus within which inlet passages rotate. Each seal is formed as a multiplicity of arcuate segments resiliently biased towards the sleeve and having movably sealed end face portions to maintain pressure tightness. The body further has a radial flow passage for admission of air under pressure to the annular space and a flexible fluid connector connects the radial flow passage to an air supply line leading from the hull structure. The present shaft delivery slip ring avoids the need to feed air down the whole length of the propeller shaft or to feed air into the hub through a slip ring making wiping contact with the hub, which is structurally more complex.

REFERENCES:
patent: 1097991 (1914-05-01), Sawyer
patent: 2707388 (1955-05-01), Kent
patent: 3172671 (1965-03-01), Downs
patent: 4188906 (1980-02-01), Tachmindji et al.
patent: 4218185 (1980-08-01), Trytek
patent: 4481976 (1984-11-01), Cyphelly

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