Patent US3874857A successfully refreshed from Google Patents.
US3874857A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for filtering particulate matter from gas and having reverse flow cleaning means
Assignee: Spencer Turbine Co
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Filing: 1974-01-07
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Granted: 1975-04-01
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Expires: 1994-01-07
Abstract
Abstract Apparatus for filtering dust particles from air comprises a plurality of flexible tubular-shaped gas permeable filter elements through which dust-laden air is constrained to pass in flowing through the apparatus. Each filter element has a cleanair outlet opening from which filtered air is withdrawn and a frustroconical diffuser disposed externally thereof in coaxial alignment with and axially spaced from the outlet opening. Means is provided to direct high velocity streams of air to and along the outer surface of the diffuser and in the direction of the outlet opening whereby the streams are evenly distributed over the surface of the diffuser and enter the filter element and flow therethrough in a controlled manner and in a direction counter to the direction of filtered air flow therefrom.
Inventors
- 👤 David H Hunt
- 👤 Raymond J Allain
- 👤 Joseph E Maselek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:15
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/02; B01D46/04; B01D46/42; B01D46/4281; B01D46/66; B01D46/70; B01D46/71; Y; Y10; Y10S; Y10S55/00; Y10S55/26
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
180 words
In an apparatus for filtering particulate matter from a gaseous stream, the combination comprising an axially elongated flexible tubular-shaped gas permeable filter element having a clean gas outlet opening at one end thereof, a substantially gas impervious frustroconical diffuser, means for supporting said diffuser externally of said filter element and in generally coaxial alignment with and axially spaced relation to said outlet opening, said diffuser diverging in the direction of said outlet opening and having a major diameter substantially smaller than the diameter of said outlet opening, and means comprising a plenum chamber having a generally radially disposed wall facing in the direction of and axially spaced from said one end and having a plurality of gas passageways opening therethrough for directing a plurality of streams of gas from said plenum chamber toward the outer peripheral surface of said diffuser near the smaller end thereof and in the direction of said outlet opening, whereby said gas streams travel generally along a path defined by said outer peripheral surface and into and through said outlet opening and into said filter element.
Claim 2
Dependent Claim
180 words
In an apparatus for filtering particulate matter from a gaseous stream, the combination comprising an axially elongated flexible tubular-shaped gas permeable filter element having a clean gas outlet opening at one end thereof, a substantially gas impervious frustroconical diffuser, means for supporting said diffuser externally of said filter element and in generally coaxial alignment with and axially spaced relation to said outlet opening, said diffuser diverging in the direction of said outlet opening and having a major diameter substantially smaller than the diameter of said outlet opening, and means comprising a plenum chamber having a generally radially disposed wall facing in the direction of and axially spaced from said one end and having a plurality of gas passageways opening therethrough for directing a plurality of streams of gas from said plenum chamber toward the outer peripheral surface of said diffuser near the smaller end thereof and in the direction of said outlet opening, whereby said gas streams travel generally along a path defined by said outer peripheral surface and into and through said outlet opening and into said filter element.
Claim 3
Dependent Claim
21 words
The combination as set forth in claim 1 wherein said means defining said plenum chamber comprises said means supporting said diffuser.
Claim 4
Dependent Claim
33 words
The combination as set forth in claim 2 wherein said diffuser is attached at its smaller end to said wall and said passageways are arranged circumaxially of said smaller end of said diffuser.
Claim 5
Dependent Claim
19 words
The combination as set forth in claim 3 wherein said passageways comprise equiangularly spaced orifices formed in said wall.
Claim 6
Dependent Claim
17 words
The combination as set forth in claim 4 wherein said orifices are substantially adjacent said smaller end.
Claim 7
Dependent Claim
71 words
The combination as set forth in claim 1 including a rigid generally cylindrical support member defining said outlet opening, an axially elongated tubular skeletal support frame, means for releasably connecting said support frame to said support member, said filter element comprising a bag filter made from porous fabric and closely coaxially surrounding said skeletal support frame, and means for releasably retaining said bag filter in connected relation to said support member.
Claim 8
Dependent Claim
166 words
The combination as set forth in claim 6 wherein said tubular skeletal frame has a helical rod generally defining one end thereof and a circumaxial series of elongated rods connected to said helical rod and extending in one axial direction therefrom to define the periphery of said tubular skelEtal frame and said support member has one general cylindrical end portion which has an outside diameter substantially equal to the outside diameter of said tubular skeletal frame and another generally cylindrical end portion which has an outside diameter substantially equal to the inside diameter of said helical rod, said support member has at least one stud projecting generally radially outwardly from said other end portion for threadable engagement with said helical rod, said stud and said rod comprises said means for releasably connecting said skeletal support frame to said support member, and said means for releasably retaining said filter element on said support member comprises means for clamping said bag filter to said one cylindrical end portion.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |