Axial flow impeller with improved blade shape

Fluid reaction surfaces (i.e. – impellers) – Specific blade structure – Tined or irregular periphery

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416223R, F04D 2938

Patent

active

040638529

ABSTRACT:
An axial flow impeller for low pressure ratio applications in the range 1.03 and below and comprising a hub carrying a plurality of similar circumaxially arranged air moving blades. Each blade has a root portion attached to the hub and a radially outwardly disposed tip portion. The camber of each blade decreases from root to tip with 0.1203 root camber and .023 tip camber for a ratio of 5.23 to 1. Pitch also decreases from root to tip with a root pitch of 46.degree. and a tip pitch of 27.4.degree. for a ratio of 1.68 to 1. Chord increases from root to tip with a 1.528 inch root chord and a 2.59 inch tip chord for a 1.7 to 1 ratio. The blade camber and chord both change gradually at the blade inner and mid portions with a 35% camber decrease in the outermost 20% of blade span, and with substantially all of the chord increase occurring beyond the blade midpoint.

REFERENCES:
patent: 995562 (1911-06-01), Plewes
patent: 1088883 (1914-03-01), Donath
patent: 1515268 (1924-11-01), Morrow
patent: 1546554 (1925-07-01), Ross
patent: 1688809 (1928-10-01), Gill
patent: 1855660 (1932-04-01), Allen
patent: 1891612 (1932-12-01), Schmidt
patent: 3023709 (1962-03-01), Kondo

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