Gas separation: processes – Filtering – Plural separate media
Reexamination Certificate
1999-02-26
2001-04-03
Simmons, David A. (Department: 1724)
Gas separation: processes
Filtering
Plural separate media
C055S319000, C055S472000, C055S480000, C055S486000, C055S489000, C055S502000, C055S521000
Reexamination Certificate
active
06210469
ABSTRACT:
FIELD OF THE INVENTION
This disclosure relates generally to air cleaners. Specifically, this disclosure relates to air cleaners for use with vacuum filter apparatus and methods for cleaning air.
BACKGROUND OF THE INVENTION
Many machine shops or wood-working shops typically will include tools that produce dust or chips. For example, most wood shops will produce sawdust and chips as the workpiece is being machined. Sawdust can be produced from such operations as cutting, routing, sanding, turning, and many others.
Dust collection systems have been developed to draw the generated sawdust into a central collection system. One system that has been developed is a typical vacuum-type arrangement, or “shop vacuum.”
Some shop vacuums do not achieve an acceptable level of air cleaning. Further, some shop vacs can clog very quickly due to the size of sawdust, etc. Improvements are desirable.
SUMMARY OF THE DISCLOSURE
In one aspect, the disclosure describes a filter arrangement comprising a housing having an inlet and an outlet. The inlet is for in taking particulate-laden air, and the outlet is for exhausting clean air. Preferably, a first chamber is in the housing downstream of the inlet. The first chamber is preferably for permitting expansion of particulate-laden air, and defines a particle collection chamber. Preferably, a second chamber is in the housing downstream of the first chamber. A first region of filtering media is preferably located between the first and second chambers. The first region of filtering media is for removing at least a portion of particles from the particulate-laden air and depositing the particles in the particle collection container. Preferably, a third chamber is located in the housing downstream from the second chamber. The third chamber defines a clean air plenum. A second region of filtering media is preferably oriented within the third chamber and downstream of the second chamber. The second region of filtering media is for removing at least a portion of the particles from the particulate-laden air.
In preferred embodiments, the filter arrangement is usable within a shop vacuum assembly. The shop vacuum assembly preferably includes a blower arrangement for directing air from the inlet, to the first chamber, through the first region of filter media, to the second chamber, through the second region of filter media, to the third chamber, and out through the outlet.
Methods for removing and replacing the filtering media are provided herein.
The disclosure also describes a method of cleaning air comprising directing particulate-laden air from an inlet into a first chamber having a greater cross-sectional area than the inlet. Next, the particulate-laden air is directed through a screen member over the first chamber to remove particles having a size greater than a pore size of the screen member. Next, the particulate-laden air is directed in a direction between about 60-120 degrees from the screen member through a region of filter media to remove additional particles from the particulate-laden air and to result in at least partially cleaned air. Next, the at least partially cleaned air is exhausted through an outlet.
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Donaldson & Company, Inc.
Hopkins Robert A.
Merchant & Gould P.C.
Simmons David A.
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