High-pumping fan with ring-mounted bladelets
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United States of America Patent
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-
Sep 22, 1998
Grant Date -
N/A
app pub date -
May 12, 1997
filing date -
May 12, 1997
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A vehicle fan assembly for circulating air to cool an engine. The fan assembly has a central hub; an outer, circumferential ring with an inner surface disposed around the hub; a plurality of blades, each blade having a root connected to the hub, a tip connected to the inner surface of the ring, and a span between the root and the tip, the blades extending generally radially outward from the hub to the ring; and at least one bladelet having a base connected to the inner surface of the ring, a free end, and a span between the base and the free end. Preferably, a plurality of bladelets are disposed alternately with the blades on the inner surface of the ring around the circumference of the ring. The span of each bladelet is about 40% to 50% of the span of the blades. The tips of the blades and the bases of the bladelets are connected to the ring over the full width of the blades and the bladelets, respectively. Finally, each bladelet has a planform with an elliptical profile.
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