Impeller blades

Details Impeller blades Impeller blades

1974-09-18

1976-06-22

Powell, Jr, Everette A.

Fluid reaction surfaces (i.e., impellers)

Rotor having flow confining or deflecting web, shroud or...

Radially extending web or end plate

416223A, F01D 504

Patent

active

039648419

ABSTRACT:
A multi-blade impeller for a hydrodynamic pump, fan or the like. Each blade has a curved pressure and a curved suction surface. The pressure surface has a curvature, the angle of inclination of which gradually increases from the leading edge to a first point and then decreases to the trailing edge. The suction surface has a curvature, the angle of inclination of which gradually decreases from the leading edge to a second point and thereafter increases toward the trailing edge. The first point is determined by the intersection of a logarithmic spiral from the trailing edge of the adjoining blade with the pressure surface, while the second point is determined by the intersection of a second logarithmic spiral from the leading edge of the other adjoining blade with the suction surface.

REFERENCES:
patent: 867069 (1907-09-01), Neumann
patent: 2165808 (1939-07-01), Murphy
patent: 2266180 (1941-12-01), Emerick
patent: 3440969 (1969-04-01), Kondo
patent: 3610775 (1971-10-01), Swearingen
patent: 3639080 (1972-02-01), Yamabe
patent: 3788765 (1974-01-01), Rusak

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