Fluid reaction surfaces (i.e. – impellers) – With fluid passage in working member communicating with... – Both inlet and outlet to working fluid
Patent
1977-12-20
1980-03-04
Powell, Jr., Everette A.
Fluid reaction surfaces (i.e., impellers)
With fluid passage in working member communicating with...
Both inlet and outlet to working fluid
416232, 416237, 416DIG3, F04D 2938
Patent
active
041915062
ABSTRACT:
A propeller or impeller construction having a plurality of blades mounted on a hub section. The blades are essentially triangular in cross section and are hollow to achieve light-weight and permit center air flow. In addition, the blades may be tapered in such manner that accelerated internal air movement with compression toward the tip ends is enabled. The tip portions of the blades may be vented to provide for air flow through the center and out of the tips, and also the rear structural plate may be vented to the low pressure side of the blades. Blade construction may provide for variations in the pitch angle. The blades are mounted on the hub section by a unique construction which may provide both commonality and interchangeability of parts. This construction also enables the use of shims to facilitate balancing and to change and/or adjust thrust characteristics without changing blades. The construction provides that high inertial loads are contained near or within the plane of rotation, thereby eliminating the need for massive and inefficient constructions normally required to absorb the extreme moments present when the inertial loads occur at an angle to the plane of rotation. The construction of the blades is such that the cross-sectional configuration and structural means in the basic design enhance the performance of a propeller fan so constructed when operating in its own self-created down draft. In addition, the invention provides a propeller fan construction of high strength-to-weight ratio with unusual economies of manufacture and assembly.
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