US4227903A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter cell apparatus
Assignee: Bahco Ventilation AB
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Filing: 1978-08-31
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Granted: 1980-10-14
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Expires: 1998-08-31
Abstract
Abstract A cell filter apparatus of the bag or stocking type having a housing is disclosed. A gas deflector and boundary wall between a raw gas duct and a dust chamber upstream from the filter cells form a tapering duct having an outlet passage for coarse dust particles at its narrow end. Either the deflector or the boundary wall is pivoted so that the size of the outlet passage can vary so as to remove coarse dust from the outlet passage. A gas blast for cleaning the filter cells in a direction to move the pivoted element so that the outlet passage is varied and cleaned.
Inventors
- 👤 Karl-Axel G. Gustavsson
- 👤 Holger A. Persson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:28
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/02; B01D46/04; B01D46/66; B01D46/70; B01D46/71; B01D50/00; B01D50/20; B01D2201/00; B01D2201/31; B01D2201/313
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
238 words
A compact cell filter apparatus comprising: a housing; at least one filter cell in said housing having a gas flow direction; a dust chamber adjacent to, and communicating with, the upstream end of said at least one cell; a raw gas duct on said housing, said gas flow direction being from said raw gas duct towards said at least one filter cell, said raw gas duct being adjacent to, and communicating with, the upstream end of said dust chamber, said raw gas duct including a boundary wall at its downstream end; filter cleaning means communicating with the downstream end of said at least one cell, said filter cleaning means including gas blast means for providing gas blast shocks in a direction opposite that of said gas flow direction; gas deflector means located between said dust chamber and said raw gas duct, said gas deflector means and said boundary wall together forming a tapering duct for supplying raw gas from said raw gas duct to said dust chamber, one of said gas deflector means and said boundary wall being at least partially movable in response to said gas blast shocks, said tapering duct narrowing to a passage whose width varies in response to the movement of said one of said gas deflector means and said boundary wall, whereby said movement of said one of said gas deflector means and said boundary wall helps remove dust particles from said passage.
Claim 2
Dependent Claim
238 words
A compact cell filter apparatus comprising: a housing; at least one filter cell in said housing having a gas flow direction; a dust chamber adjacent to, and communicating with, the upstream end of said at least one cell; a raw gas duct on said housing, said gas flow direction being from said raw gas duct towards said at least one filter cell, said raw gas duct being adjacent to, and communicating with, the upstream end of said dust chamber, said raw gas duct including a boundary wall at its downstream end; filter cleaning means communicating with the downstream end of said at least one cell, said filter cleaning means including gas blast means for providing gas blast shocks in a direction opposite that of said gas flow direction; gas deflector means located between said dust chamber and said raw gas duct, said gas deflector means and said boundary wall together forming a tapering duct for supplying raw gas from said raw gas duct to said dust chamber, one of said gas deflector means and said boundary wall being at least partially movable in response to said gas blast shocks, said tapering duct narrowing to a passage whose width varies in response to the movement of said one of said gas deflector means and said boundary wall, whereby said movement of said one of said gas deflector means and said boundary wall helps remove dust particles from said passage.
Claim 3
Dependent Claim
36 words
The filter apparatus of claim 1 wherein said gas delfector means comprises a movable deflector element having a pivotable end and a free end, said free end being separated from said boundary wall by said passage.
Claim 4
Dependent Claim
43 words
The filter apparatus of claim 1 wherein said boundary wall comprises an upstream fixed section and a downstream movable section, said movable section having a pivotable end and a free end, said free end being separated from said boundary wall by said passage.
Claim 5
Dependent Claim
33 words
The filter apparatus of claim 3 wherein said boundary wall includes a circulation gap between said fixed and movable secions, whereby a partial gas flow is caused to circulate around said movable section.
Claim 6
Dependent Claim
34 words
The filter apparatus of claim 3 or claim 4 wherein said deflector means comprises an unperforated extension and said free end and said unperforated extension form a diffuser means immediately downstream from said passage.
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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) | 1983-10-14 | 1984-04-14 | 1984-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-14 | 1988-04-14 | 1988-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-14 | 1992-04-14 | 1992-10-14 | $7700.00 | Window Closed / Lapsed |