Gas separation – With recycle means
Reexamination Certificate
1999-10-20
2001-06-19
Smith, Duane S. (Department: 1724)
Gas separation
With recycle means
C055S385200, C055S418000, C055S419000, C454S187000, C454S188000
Reexamination Certificate
active
06248146
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to high efficiency air filter assemblies, and more particularly, to high efficiency air filter assemblies which utilize a primary, high pressure air source to draw, via induction, air from a secondary low pressure air source.
BACKGROUND OF THE INVENTION
Industrial clean rooms require filtered air at a high flow rate relative to the rates required for ordinary commercial environments. Typically, a clean room will require 100 times the flow rate used in an ordinary commercial space. The air handling units required to deliver this flow rate occupy a substantial fraction of a clean room facility's total space and account for a substantial fraction of the clean room's operating cost. The present invention reduces the required air handling volume, and thus the space occupied by the air handling equipment, by about ½, while reducing the required air handler power consumption by about 25%.
An object of the present invention is to provide a high efficiency air filter assembly which combines two sources of air via induction, thereby delivering substantially twice the primary air flow, against a relatively high pressure load such as a high efficiency filter.
Other objects of the present invention will in part be evident and will in part appear hereinafter. The invention accordingly comprises the process involving the several steps and the relation and order of one or more of such steps with respect to the others and the apparatus possessing the construction, combination of elements, and arrangement of parts exemplified in the following detailed disclosure, and the scope of the application of which will be indicated in the claims.
SUMMARY OF THE INVENTION
The present invention is directed to a system for accepting primary air from an air handling unit, drawing by induction a comparable amount of secondary air from the return plenum in which the device resides, and delivering the total to an integral high efficiency filter at the required flow volume and pressure. The primary air is distributed through a primary air intake plenum to a narrow throat aperture at a sufficiently high velocity so that, by the Bernoulli Effect, a negative pressure is created at the secondary air opening sufficient to draw in the required volume of secondary air. A momentum transfer section accelerates the secondary air while decelerating the primary air, to create a velocity profile suitable for the following static regain section, in which the kinetic energy density of the entering air is largely converted into required static pressure as the velocity is gradually reduced. Finally, the required volume of air is discharged through the high efficiency filter.
REFERENCES:
patent: 3688477 (1972-09-01), Coward, Jr.
patent: 4191543 (1980-03-01), Peters
patent: 4606259 (1986-08-01), Nystrom
patent: 4901764 (1990-02-01), Meline
patent: 5290331 (1994-03-01), Miles et al.
McDermott & Will & Emery
Smith Duane S.
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