Patent US3594992A successfully refreshed from Google Patents.
US3594992A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cleaning arrangement for bag filter
Assignee: Alstom Power Inc
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Filing: 1969-04-01
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Granted: 1971-07-27
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Expires: 1989-04-01
Abstract
Abstract A cleaning arrangement for a bag filter whereby a jet of compressed air is directed from a nozzle into the bag filter and on to a novel deflector which divides the air into a portion that passes axially and a portion that is deflected radially. The portion passing axially thereof increases the pressure within the bag to cause the walls of the bag to flex outwardly and dislodge the dust cake on the outer surface thereof. The portion of the cleaning air from the nozzle that strikes the deflector is deflected radially on to walls of the filter bag also causing the flexing action which is propagated down the length of the bag to reinforce the action of the air which passes centrally therethrough.
Inventors
- 👤 George P Carr
- 👤 Noel D Hazzard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:09
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/02; B01D46/04; B01D46/0039; B01D46/0041; B01D46/0043; B01D46/66; B01D46/70; B01D46/71
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
193 words
An apparatus for filtering solids from fluids having a housing including an inlet for a dust-bearing gas and an outlet for a clean gas, an apertured partition intermediate said inlet and outlet dividing the housing into inlet and outlet compartments, a tubular filter bag having an open end and a closed end depending from said apertured partition and communicating with an aperture in said partition at the open end, a source of pressurized cleaning gas, cleaning means for the filter bag comprising a nozzle extending into the open end of the tubular filter bag and connected to said source for the exhaust of pressurized cleaning gas into the open end of the tubular filter bag, means for intermittently exhausting a blast of cleaning gas from said nozzle in opposition to the direction of clean gasflow through said filter bag, and an annular deflector adjacent the outlet end of the cleaning nozzle and at the upper end of the filter bag arranged to provide an annular space therearound and a central opening therethrough wherein the ratio of the area of the annular space to the central opening does not exceed approximately 10 to 1.
Claim 2
Independent Claim
193 words
An apparatus for filtering solids from fluids having a housing including an inlet for a dust-bearing gas and an outlet for a clean gas, an apertured partition intermediate said inlet and outlet dividing the housing into inlet and outlet compartments, a tubular filter bag having an open end and a closed end depending from said apertured partition and communicating with an aperture in said partition at the open end, a source of pressurized cleaning gas, cleaning means for the filter bag comprising a nozzle extending into the open end of the tubular filter bag and connected to said source for the exhaust of pressurized cleaning gas into the open end of the tubular filter bag, means for intermittently exhausting a blast of cleaning gas from said nozzle in opposition to the direction of clean gasflow through said filter bag, and an annular deflector adjacent the outlet end of the cleaning nozzle and at the upper end of the filter bag arranged to provide an annular space therearound and a central opening therethrough wherein the ratio of the area of the annular space to the central opening does not exceed approximately 10 to 1.
Claim 3
Dependent Claim
58 words
An apparatus for filtering solids from fluids as defined in claim 1 wherein the annular deflector is of frustoconical configuration with the apex thereof lying adjacent the outlet end of the cleaning nozzle to simultaneously direct a portion of the cleaning gas axially along said bag and deflect a portion of it radially on to the surface thereof.
References Cited (Backward Citations)
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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) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |