Fan closure flap

Details Fan closure flap Fan closure flap

1995-04-26

1996-10-22

Larson, James

Rotary kinetic fluid motors or pumps

Including working fluid force responsive vane or flow control

454360, F04D 2900

Patent

active

055671144

ABSTRACT:
This invention relates to a closure for the outlet of a fan. A fan has an outlet opening 12 in a fan case volute 10 which is closed by a hinged flap 13, the weight of the flap being compensated by a counterweight arm 15. When the flap 13 closes opening 12, counterweight arm 15 is latched by latch 32 carried by spring 26 which must deform before the flap can open. Alternatively, the latch 32 is itself a resilient spring. The flap will only open when sufficient static pressure is applied by the fan, and the resilient latch 25, 32 will prevent "flutter" which might be otherwise caused by outside air currents.

REFERENCES:
patent: 1613897 (1927-01-01), Lichty et al.
patent: 2502736 (1950-04-01), Marcoe
patent: 3479947 (1969-11-01), Myers
patent: 4385552 (1983-05-01), Nabben

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