Rotary kinetic fluid motors or pumps – With means for re-entry of working fluid to blade set – Cross flow runner
Patent
1989-08-08
1991-10-15
Kwon, John T.
Rotary kinetic fluid motors or pumps
With means for re-entry of working fluid to blade set
Cross flow runner
415 533, F04D 500
Patent
active
050569872
ABSTRACT:
A cross flow type fan system is provided with a tongue having a first surface positioned adjacent the outlet of the fan system in a direction generally parallel to the direction of travel of a majority of the air exiting the system. The tongue further has a second surface of a given width positioned at an angle relative to the first surface and a third surface having a given width with the first and third surfaces being positioned generally perpendicular to one another. Due to the shape of the tongue, static pressure of the discharge air flow can increase at both ends of the discharge opening. Pressure characteristics of the discharge air flow is therefore improved to obtain better stability. Ends of the tongue can be positioned further from an outward circumferential surface of the fan than the middle section of the tongue due to differences in cross-sectional shape. The middle section of the tongue can also have a point of protrusion in cross section at a lower position while the ends of the tongue have a generally flat face in cross section at the lower position. This arrangement will improve overall stability of discharge air, especially in the low air volume range.
REFERENCES:
patent: 1920952 (1933-08-01), Anderson
patent: 3124301 (1964-03-01), Helmbold
patent: 3258195 (1966-06-01), Laing
patent: 3322332 (1967-05-01), Laing
patent: 3459365 (1969-08-01), Glucksman
patent: 4014625 (1977-03-01), Yamamoto
patent: 4025223 (1977-05-01), Anders et al.
patent: 4078870 (1978-03-01), Keller et al.
patent: 4712976 (1987-12-01), Hopfensperger et al.
patent: 4913622 (1990-04-01), Tanaka et al.
Shinobu Yoshiharu
Tanaka Syozo
Kwon John T.
Sharp Kabushiki Kaisha
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