Ventilator having an optimum fan structure

Details Ventilator having an optimum fan structure Ventilator having an optimum fan structure

2005-03-15

2005-03-15

Look, Edward K. (Department: 3745)

Fluid reaction surfaces (i.e., impellers)

Perimetric blading extending axially between annular members

C416S18600A

Reexamination Certificate

active

06866481

ABSTRACT:
A ventilator fan structure includes a disk-shaped seat, an annular plate, and a plurality of blades. Each of the blades is arranged in an oblique manner along a rotational direction of the fan structure and has a primary blade portion and a secondary blade portion with different widths, thereby enhancing the suction force of each of the blades for the oil and smoke. Thus, the fan structure enhances the air drainage rate of the ventilator and reduces noise during operation of the ventilator.

REFERENCES:
patent: 1730372 (1929-10-01), Lawrie
patent: 1781165 (1930-11-01), Criqui
patent: 1876518 (1932-09-01), Mathis
patent: 1876871 (1932-09-01), Doman
patent: 2224617 (1940-12-01), Sylvan
patent: 2803398 (1957-08-01), Sprouse
patent: 3368744 (1968-02-01), Jenn
patent: 3394876 (1968-07-01), Eck
patent: 5988979 (1999-11-01), Wang
patent: 58035296 (1983-03-01), None

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