Apparatus for adjusting flow rate through a fan

Details Apparatus for adjusting flow rate through a fan Apparatus for adjusting flow rate through a fan

1989-03-31

1990-05-29

Garrett, Robert E.

Rotary kinetic fluid motors or pumps

Selectively adjustable vane or working fluid control means

Upstream of runner

F01D 1714

Patent

active

049291505

ABSTRACT:
The present invention relates to a flow rate adjustment device which allows for adjustment of air flow through the fan without changing the rpms of the fan blades. In one embodiment, an adjustable plate is located in the center of the impeller and is movable in such a manner that various lengths of the blade edges are blocked from the intake air at the center of the impeller. In another embodiment of the invention, the plate is replaced by an inflatable blocking device which can be inflated to various degrees thereby blocking various lengths of the blade edges. In both embodiments, the blocking of the blade edges results in less intake air being exposed to the blades, and thus less air moves through the fan even though the rpms remain constant.

REFERENCES:
patent: 1467901 (1923-09-01), Lange
patent: 1529711 (1925-03-01), Parrott et al.
patent: 1834959 (1931-12-01), May
patent: 2100152 (1937-11-01), Youker
patent: 2430225 (1947-11-01), Hagler
patent: 2542121 (1951-02-01), Earl
patent: 2837021 (1958-06-01), McLarty
patent: 4375939 (1983-03-01), Mount et al.
patent: 4808068 (1989-02-01), Asbjornson et al.

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