Axial flow fan impeller

Fluid reaction surfaces (i.e. – impellers) – Articulated – resiliently mounted or self-shifting impeller... – Resilient bias or mount

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416157R, 416205, F04D 2936

Patent

active

045795100

ABSTRACT:
An axial flow fan impeller having a number of blades, which are rotatably journalled in a wheel rim (3), each with its blade root (4) which is connected with an adjusting device (10) for the blades. The wheel rim comprises as a supporting member for the blades an annular body of revolution (6) with bores (5) for the blade shafts and a cut-out for taking up a thrust bearing (7). The body of revolution is connected with the body plate (18) and the front plate (21) of the impeller through tubular connecting pieces (19, 20), which are symmetrical relative to the body of revolution and are elastically deformable by loading forces acting in the radial plane of the wheel, but have a relatively great rigidity against forces acting in the axial direction. The impeller may thus be fabricated by welding, without the occurrence of dynamic loads exceeding the allowable values for the welding joints (25, 26).

REFERENCES:
patent: 2844303 (1958-07-01), Kristiansen
patent: 2951545 (1960-09-01), Heuver
patent: 3006417 (1961-10-01), Busquet
patent: 3139310 (1964-06-01), Jungstrom
patent: 3984194 (1976-10-01), Fermer et al.

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