Ventilation – Electronic cabinet
Patent
1994-10-31
1995-10-24
Joyce, Harold
Ventilation
Electronic cabinet
361695, 361818, H05K 720, H05K 900
Patent
active
054605717
ABSTRACT:
An electro-magnetically shielded fan grill for use in venting air to a metallic cabinet. The fan grill has a multitude of arcuately-shaped trapezoidal vent apertures formed in one of the side panels of the cabinet. The vent apertures are optimally arranged in a plurality of concentric circular rows. Each aperture is substantially the same size and shape as every other aperture in the same row. Each aperture and each row of apertures is spaced apart so that the minimum distance between each aperture is substantially the same for all apertures in all rows. The size of each aperture is designed so that the longest chord of any arc segment is made less than .lambda./10 which .lambda. is the wavelength of the highest frequency signal to be contained within the enclosure. At least a single row of aperture vents near the outside perimeter of the grill is inclined outwardly from the plane of the side panel at an angle .alpha..sub.o so as to displace the plane of those apertures in the center section of the grill. The central portion of the fan grill is thus extended outwardly, so that a fan housing can be connected directly to the interior face of the side panel, without excessive air turbulence. In an alternate embodiment, all of the apertures are bowed outwardly so that a fan housing can be connected directly to the interior face of the side panel, without excessive air turbulence.
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D. H. Kekas, et al., "Snap-Together Cooling Fan Assembly", IBM Technical Disclosure Bulletin, IBM Corp., vol. 22, No. 6, Nov. 1979, pp. 2391 and 2392.
Kato Jun-ichi
Yenick Jon A.
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