Fluid reaction surfaces (i.e. – impellers) – Rotor having flow confining or deflecting web – shroud or... – Radially extending web or end plate
Patent
1977-08-17
1979-08-07
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
416202, 261 91, B01F 304
Patent
active
041636317
ABSTRACT:
Several forms of surface impeller for aeration of liquids are disclosed. All of the forms are of the shrouded or closed turbine type. In one form, the impeller has a large-diameter flat steel horizontal upper disc adapted to be secured to the lower end of a vertically disposed rotatable drive shaft. Secured, as by welding, to the undersurface of the upper disc are a plurality, such as six or eight or other number, of vertical blades at uniform spacing. Each blade is curved in a retreating or backward direction relative to the direction of rotation of the impeller. Each blade has a long or deep vertical inner edge located forward of the center axis of rotation. The lower edge of each blade is inclined upwardly toward a relatively short or shallow vertical outer edge located near the outer periphery of the upper disc. The horizontal innermost portion of the otherwise inclined bottom edge of each blade is welded to a small lower tie plate. The long vertical inner edge of each blade is welded continuously to the face of the next proceeding blade, thereby to form a hollow hexagonal liquid-tight chamber extending along the axis of rotation from the upper disc to the lower tie plate. The upper disc has reinforcing angle irons disposed in a hexagonal configuration welded to its upper surface. In another form, the blades are reverse curved, with only the inward portions of the blades being curved in a retreating or backward direction relative to the direction of rotation of the impeller, the outward portions being curved in the forward direction and extending well beyond the periphery of the upper disc. In yet another form, which is a preferred form for some purposes, the blades are not curved. They are flat and of rectangular cross section, and they are disposed in a backward direction relative to the direction of rotation of the impeller.
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Connolly John R.
Gibson David E.
Heimark Edward L.
Quinn Jerome B.
Speechley Richard E.
Philadelphia Gear Corporation
Powell Jr. Everette A.
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