F - Mech Eng,Light,Heat,Weapons – 04 – D
Patent
F - Mech Eng,Light,Heat,Weapons
04
D
230/20, 230/3
F04D 29/32 (2006.01) F04D 29/34 (2006.01) F04D 29/36 (2006.01) F04D 29/66 (2006.01)
Patent
CA 1045094
AXIAL FLOW FANS ABSTRACT OF THE DISCLOSURE In an axial flow fan impeller, the natural fre- quency of vibration of the individual blades is increased by mounting each blade to the annular support rim or hub for swinging movement relative to the ring about an axis, which lies generally perpendicular to a radius passing through the mounting. For a given blade, the mounting en- ables the fan to be rotated at higher speeds with a corre- sponding increase in performance. The mounting also per- mits the use of thinner, lighter-weight blades for a given operating speed and this permits a reduction in the cross- sectional area of the rim. If the impeller includes a mechanism for controlling the pitch of all the blades dur- ing operation, the use of lighter-weight blades reduces the stresses on the mechanism so that the design and strength of the latter does not tend to be a limiting fac- tor on the maximum permissible speed for the impeller.
224430
Fermer Karl E.f.
Svensson Dennis I.
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