Rotary kinetic fluid motors or pumps – Including working fluid force responsive vane or flow control – Upstream of runner
Reexamination Certificate
2005-10-11
2005-10-11
Joyce, Harold (Department: 3749)
Rotary kinetic fluid motors or pumps
Including working fluid force responsive vane or flow control
Upstream of runner
C416S22300B, C416S228000, C454S259000, C454S353000
Reexamination Certificate
active
06953320
ABSTRACT:
A ventilation fan assembly (10) having a fan (22) mounted in a housing (12) and a shutter assembly (60). The housing has a square inlet portion (12C), a circular center portion (12E) and a conical outlet portion (12D) having rifling grooves (20). The shoulder (16) formed between the inlet portion and the center portion is radiused to reduce disruption of air flowing from the inlet portion to the center portion. The shape of the blades (32) of the propeller (28) is such that the axial velocity produced as the propeller rotates is essentially constant along the length of the blades. The shutter assembly has a large, radiused entrance and airfoil shaped blades which reduce air disruption. The blades have a flexible flap (68) along the trailing edges (64D) which form a seal between adjacent blades to prevent air from leaking from the housing through the shutter assembly.
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Davis James R.
Hansen Daniel G.
Joyce Harold
McLeod Ian C.
Moyne Mary M.
Munters Corporation
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