Browse Prior Art Database

Volumetric Clean Air Controller

IP.com Disclosure Number: IPCOM000075172D
Original Publication Date: 1971-Aug-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Crouse, RW: AUTHOR

Abstract

In both vertical and horizontal laminar flow consoles, such as the console 10 illustrated schematically in Fig. 1, a window 11 is conventionally slidable both upwardly and downwardly so as to facilitate, when desired, both entrance to and egress from the working area. Ideally the velocity of the air leaving the console through the open window area should approximate 100 feet per minute. Any lower velocity allows particle settling and improper purging of the work area, while excessive velocity makes for operator discomfort.

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Volumetric Clean Air Controller

In both vertical and horizontal laminar flow consoles, such as the console 10 illustrated schematically in Fig. 1, a window 11 is conventionally slidable both upwardly and downwardly so as to facilitate, when desired, both entrance to and egress from the working area. Ideally the velocity of the air leaving the console through the open window area should approximate 100 feet per minute. Any lower velocity allows particle settling and improper purging of the work area, while excessive velocity makes for operator discomfort.

In order to maintain the 100 feet per minute ideal velocity regardless of window position, it is necessary to speed up the blower when the window is raised so as to increase the volumetric air flow, thereby preventing a decrease in the velocity of the air purging the window area. In a like manner, when the window is lowered the volumetric air flow may be decreased to maintain the ideal velocity.

To this end the upper portion of the window 11 includes a track 12 in which the lower end 13 of a bar 14 is positioned. The bar is connected, as by a standard fitting 15, to a shaft 16 of a potentiometer 17 which is directly linked to a variac or other speed control for the blower motor. Thus as the window is elevated, the potentiometer shaft 16 tends to rotate clockwise increasing the speed of the blower, the converse being true as the window is lowered. Other methods may be employed for adjusting the speed of the blower...