US4544389A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple jet backflushed air filter
Assignee: Individual
•
Filing: 1983-11-07
•
Granted: 1985-10-01
•
Expires: 2003-11-07
Abstract
Abstract A reverse air jet cleaning system for impingement or porous media type air filter elements includes one or more specifically shaped cleaning air manifolds or heads in which a plurality of jet nozzles or orifices are arranged in a predetermined pattern to provide a totally enveloping air jet which is discharged into a flow tube immediately downstream of the clean air flow chamber of a generally tubular filter element. The jet pattern provides a temporary pressure seal within the flow tube and entrains a substantial amount of ambient air into the reverse flow jet to thoroughly flush or flood the filter element to clean the dust cake from the exterior surface of the element. The multiple jet arrangement reduces the overall space occupied by the reverse jet cleaning system and provides a larger mass flow of cleaning air to thoroughly flush the surfaces of the filter element. The multiple jet orifice heads or manifolds may be configured in virtually any geometric shape to provide the desired jet pattern and are not limited to use in conjunction with cylindrical tubular type filter elements.
Inventors
- 👤 D. Franklin Howeth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:41
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/0039; B01D46/0041; B01D46/0043; B01D46/24; B01D46/2403; B01D46/2411; B01D46/42; B01D46/4272; B01D46/52; B01D46/521; B01D46/66; B01D46/70; B01D46/71; B01D2201/00; B01D2201/31; B01D2201/313; B01D2271/00; B01D2271/02; B01D2271/022
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
265 words
A porous media barrier type air filter unit, said filter unit including: a housing forming a filter chamber and including means for conducting dust laden air into said filter chamber and means for conducting filtered air from said housing; a filter element disposed in said filter chamber; means for supporting said filter element in said filter chamber, said filter element being constructed and arranged so as to define at least in part a clean air chamber for receiving air being filtered and which has flowed through said filter element; means forming a flow tube opening into said clean air chamber for conducting air which has been filtered from said clean air chamber and away from said filter element; a divider structure disposed in said clean air chamber and including means for partitioning said clean air chamber into a plurality of separate subchambers; and reverse flow air jet nozzle means comprising a plurality of separate orifices arranged in a predetermined pattern for discharging a shaped jet of pressure air for contact with substantially the entire periphery of the walls of said flow tube and for inducting a relatively large volume of substantially ambient pressure air into said flow tube in a direction opposite to the normal direction of flow of air which has been filtered out of said clean air chamber to backflush said filter element with a quantity of combined induced and jetted pressure air, said nozzle means being arranged in such a way so as to generate a jet having a cross sectional shape conforming to the cross sectional shape of said subchambers, respectively.
Claim 2
Dependent Claim
265 words
A porous media barrier type air filter unit, said filter unit including: a housing forming a filter chamber and including means for conducting dust laden air into said filter chamber and means for conducting filtered air from said housing; a filter element disposed in said filter chamber; means for supporting said filter element in said filter chamber, said filter element being constructed and arranged so as to define at least in part a clean air chamber for receiving air being filtered and which has flowed through said filter element; means forming a flow tube opening into said clean air chamber for conducting air which has been filtered from said clean air chamber and away from said filter element; a divider structure disposed in said clean air chamber and including means for partitioning said clean air chamber into a plurality of separate subchambers; and reverse flow air jet nozzle means comprising a plurality of separate orifices arranged in a predetermined pattern for discharging a shaped jet of pressure air for contact with substantially the entire periphery of the walls of said flow tube and for inducting a relatively large volume of substantially ambient pressure air into said flow tube in a direction opposite to the normal direction of flow of air which has been filtered out of said clean air chamber to backflush said filter element with a quantity of combined induced and jetted pressure air, said nozzle means being arranged in such a way so as to generate a jet having a cross sectional shape conforming to the cross sectional shape of said subchambers, respectively.
Claim 3
Dependent Claim
97 words
The filter unit set forth in claim 1 wherein: said divider structure includes at least three radially projecting partitions for forming at least three separate subchambers of said clean air chamber, and said nozzle means includes at least three cleaning air discharge manifolds, said separate orifices comprising a plurality of orifices in each of said at least three discharge manifolds opening toward said flow tube and arranged to provide a plurality of overlapping air jets for generating a flow of cleaning air in said flow tube to backflush segments of said filter element in a predetermined sequence.
Claim 4
Dependent Claim
50 words
The filter unit set forth in claim 2 wherein: said at least three discharge manifolds are each in communication with a cleaning air supply manifold by way of conduit means and pilot operated valve means in said conduit means for supplying pressure air to said at least three discharge manifolds.
Claim 5
Dependent Claim
27 words
The filter unit set forth in claim 3 wherein: said supply manifold comprises an annular housing mounted on a support plate and disposed around said flow tube.
Claim 6
Dependent Claim
25 words
The filter unit set forth in claim 4 wherein: said at least three discharge manifolds are supported on said supply manifold by said conduit means.
Claim 7
Dependent Claim
17 words
The filter unit set forth in claim 1 wherein: said divider structure extends into said flow tube.
Claim 8
Dependent Claim
222 words
A porous media barrier type air filter unit, said filter unit including: a housing forming a filter chamber and including means for conducting dust laden air into said filter chamber and means for conducting filtered air from said housing; a filter element disposed in said filter chamber; means for supporting said filter element in said filter chamber, said filter element being constructed and arranged so as to define at least in part a clean air chamber for receiving air being filtered and which has flowed through said filter element; a divider structure disposed in said clean air chamber and including means for partitioning said clean air chamber into a plurality of separate subchambers; and reverse flow air jet nozzle means comprising a plurality of orifices arranged in a predetermined pattern for discharging a shaped jet of pressure air for inducting a relatively large volume of substantially ambient pressure air to flow in a direction opposite to the normal direction of flow of air which has been filtered out of said clean air chamber to backflush said filter element with a quantity of combined induced and jetted pressure air, said nozzle means being arranged in such a way so as to generate a plurality of jets each having a cross sectional shape conforming substantially to the cross sectional shape of said subchambers, respectively.
Claim 9
Dependent Claim
222 words
A porous media barrier type air filter unit, said filter unit including: a housing forming a filter chamber and including means for conducting dust laden air into said filter chamber and means for conducting filtered air from said housing; a filter element disposed in said filter chamber; means for supporting said filter element in said filter chamber, said filter element being constructed and arranged so as to define at least in part a clean air chamber for receiving air being filtered and which has flowed through said filter element; a divider structure disposed in said clean air chamber and including means for partitioning said clean air chamber into a plurality of separate subchambers; and reverse flow air jet nozzle means comprising a plurality of orifices arranged in a predetermined pattern for discharging a shaped jet of pressure air for inducting a relatively large volume of substantially ambient pressure air to flow in a direction opposite to the normal direction of flow of air which has been filtered out of said clean air chamber to backflush said filter element with a quantity of combined induced and jetted pressure air, said nozzle means being arranged in such a way so as to generate a plurality of jets each having a cross sectional shape conforming substantially to the cross sectional shape of said subchambers, respectively.
Claim 10
Dependent Claim
206 words
A porous media barrier type air filter unit, said filter unit including: a housing forming a filter chamber and including means for conducting dust laden air into said filter chamber and means for conducting clean air out of said housing; a porous media filter element disposed in said filter chamber; means for supporting said filter element in said filter chamber, said filter element being constructed and arranged so as to define in part a clean air chamber having a noncircular cross sectional shape for receiving air being filtered and which has flowed through said filter element; and reverse flow air jet nozzle means including at least one pressure air manifold having a plurality of orifices formed in a wall of said manifold in a predetermined pattern so as to form overlapping frusto-conical air jets which are operable to expand in such a way as to have a cross sectional shape conforming substantially to the cross sectional shape of said clean air chamber for inducting a relatively large volume of substantially ambient pressure air to flow in a direction opposite to the direction of flow of air which has been filtered out of said clean air chamber to backflush at least a portion of said filter element.
Claim 11
Dependent Claim
206 words
A porous media barrier type air filter unit, said filter unit including: a housing forming a filter chamber and including means for conducting dust laden air into said filter chamber and means for conducting clean air out of said housing; a porous media filter element disposed in said filter chamber; means for supporting said filter element in said filter chamber, said filter element being constructed and arranged so as to define in part a clean air chamber having a noncircular cross sectional shape for receiving air being filtered and which has flowed through said filter element; and reverse flow air jet nozzle means including at least one pressure air manifold having a plurality of orifices formed in a wall of said manifold in a predetermined pattern so as to form overlapping frusto-conical air jets which are operable to expand in such a way as to have a cross sectional shape conforming substantially to the cross sectional shape of said clean air chamber for inducting a relatively large volume of substantially ambient pressure air to flow in a direction opposite to the direction of flow of air which has been filtered out of said clean air chamber to backflush at least a portion of said filter element.
Claim 12
Dependent Claim
60 words
The filter unit set forth in claim 8 including: a divider structure disposed in said clean air chamber and including means for partitioning said clean air chamber into a plurality of separate subchambers, and said orifices are arranged in such a way to generate a jet having a cross-sectional shape conforming substantially to the cross-sectional shape of said subchambers, respectively.
Claim 13
Dependent Claim
188 words
A porous media barrier type air filter unit, said filter unit including: a housing defining a filter chamber, means for admitting dust laden air to said filter chamber, said housing including support means for supporting a porous media filter element for filtering a quantity of dust laden air flowing through said housing and means for conducting clean air out of said housing; a porous media filter element supported by said support means in said housing, said filter element being constructed and arranged so as to define at least in part a clean air chamber for receiving air being filtered and which has flowed through said filter element; and reverse flow air jet nozzle means having a plurality of orifices arranged in such a way as to form a plurality of freely expanding generally conical air jets which overlap to collectively form a stream of relatively high velocity air flowing in a direction opposite to the normal direction of flow of air which has been filtered through said clean air chamber and over substantially the entire cross sectional area of said clean air chamber for backflushing said filter element.
Claim 14
Dependent Claim
188 words
A porous media barrier type air filter unit, said filter unit including: a housing defining a filter chamber, means for admitting dust laden air to said filter chamber, said housing including support means for supporting a porous media filter element for filtering a quantity of dust laden air flowing through said housing and means for conducting clean air out of said housing; a porous media filter element supported by said support means in said housing, said filter element being constructed and arranged so as to define at least in part a clean air chamber for receiving air being filtered and which has flowed through said filter element; and reverse flow air jet nozzle means having a plurality of orifices arranged in such a way as to form a plurality of freely expanding generally conical air jets which overlap to collectively form a stream of relatively high velocity air flowing in a direction opposite to the normal direction of flow of air which has been filtered through said clean air chamber and over substantially the entire cross sectional area of said clean air chamber for backflushing said filter element.
Claim 15
Dependent Claim
63 words
The filter unit set forth in claim 10 wherein: said nozzle means comprises a manifold forming a chamber for containing a quantity of high pressure air, a wall of said manifold having said plurality of orifices formed therein and arranged in a predetermined pattern to form said overlapping jets so that said jets expand freely from said orifices toward said clean air chamber.
Claim 16
Dependent Claim
77 words
The filter unit set forth in claim 11 wherein: said filter unit includes a flow tube having an end forming a junction with said clean air chamber, said flow tube defining a flow area not significantly less than the cross sectional flow area of said clean air chamber and arranged such that said plurality of jets expand into contact with said flow tube to form a seal around the periphery of said flow tube at said junction.
Claim 17
Dependent Claim
227 words
A porous media barrier type air filter unit, said filter unit including: a housing forming a filter chamber and including means for conducting dust laden air into said filter chamber and means for conducting clean air out of said housing; a porous media filter element disposed in said filter chamber; means for supporting said filter element in said filter chamber, said filter element being constructed and arranged so as to define at least in part a clean air chamber for receiving air being filtered and which has flowed through said filter element; means forming a flow tube forming an outlet for clean air flowing out of said clean air chamber, said flow tube having a cross sectional flow area not significantly less than the cross sectional flow area of said clean air chamber; and reverse flow air jet nozzle means including a plurality of orifices arranged in a predetermined pattern so as to form overlapping air jets which expand to form a flow stream having a cross sectional shape corresponding substantially to the cross sectional flow area of said flow tube so as to provide a flow stream of pressure air extending substantially entirely across said clean air chamber for backflushing said filter element to remove accumulations of particulate material thereon by flooding a major portion of the media of said filter element with said pressure air.
Claim 18
Dependent Claim
227 words
A porous media barrier type air filter unit, said filter unit including: a housing forming a filter chamber and including means for conducting dust laden air into said filter chamber and means for conducting clean air out of said housing; a porous media filter element disposed in said filter chamber; means for supporting said filter element in said filter chamber, said filter element being constructed and arranged so as to define at least in part a clean air chamber for receiving air being filtered and which has flowed through said filter element; means forming a flow tube forming an outlet for clean air flowing out of said clean air chamber, said flow tube having a cross sectional flow area not significantly less than the cross sectional flow area of said clean air chamber; and reverse flow air jet nozzle means including a plurality of orifices arranged in a predetermined pattern so as to form overlapping air jets which expand to form a flow stream having a cross sectional shape corresponding substantially to the cross sectional flow area of said flow tube so as to provide a flow stream of pressure air extending substantially entirely across said clean air chamber for backflushing said filter element to remove accumulations of particulate material thereon by flooding a major portion of the media of said filter element with said pressure air.
Claim 19
Dependent Claim
195 words
A porous media barrier type air filter unit, said filter unit including: a housing forming a filter chamber and including means for conducting dust laden air into said filter chamber and means for conducting filtered air from said housing; a generally cylindrical pleated paper filter element disposed in said filter chamber; means for supporting said filter element in said filter chamber, said filter element being constructed and arranged so as to define at least in part a clean air chamber having a generally circular cross sectional shape for receiving air being filtered and which has flowed through said filter element; and reverse flow air jet nozzle means comprising a plurality of orifices arranged in a predetermined pattern for generating overlapping jets of pressure air which expand to have a collective cross sectional shape conforming substantially to the cross sectional shape of said clean air chamber for inducting a relatively large volume of substantially ambient pressure air to flow in a direction opposite to the normal direction of flow of air which has been filtered out of said clean air chamber to backflush said filter element with a quantity of combined induced and jetted pressure air.
Claim 20
Dependent Claim
195 words
A porous media barrier type air filter unit, said filter unit including: a housing forming a filter chamber and including means for conducting dust laden air into said filter chamber and means for conducting filtered air from said housing; a generally cylindrical pleated paper filter element disposed in said filter chamber; means for supporting said filter element in said filter chamber, said filter element being constructed and arranged so as to define at least in part a clean air chamber having a generally circular cross sectional shape for receiving air being filtered and which has flowed through said filter element; and reverse flow air jet nozzle means comprising a plurality of orifices arranged in a predetermined pattern for generating overlapping jets of pressure air which expand to have a collective cross sectional shape conforming substantially to the cross sectional shape of said clean air chamber for inducting a relatively large volume of substantially ambient pressure air to flow in a direction opposite to the normal direction of flow of air which has been filtered out of said clean air chamber to backflush said filter element with a quantity of combined induced and jetted pressure air.
Claim 21
Dependent Claim
250 words
A porous media barrier type air filter unit, said filter unit including: a housing including means for conducting dust laden air into said housing and means for conducting filtered air from said housing; a filter element disposed in said housing and forming a porous media barrier for collecting particulate material impinging on said filter element; means for supporting said filter element in said housing, said filter element being constructed and arranged so as to define at least in part a clean air chamber for receiving air being filtered and which has flowed through said filter element; and reverse flow air jet nozzle means comprising a plurality of orifices arranged in a predetermined pattern for generating a jet of pressure air which expands to have a cross sectional shape conforming substantially to the cross sectional shape of said clean air chamber for inducting a relatively large volume of substantially ambient pressure air to flow in a direction opposite to the normal direction of flow of air which has been filtered out of said clean air chamber to backflush said filter element with a quantity of combined induced and jetted pressure air of such magnitude that particulate material impinged on said porous media barrier may be dislodged with force sufficient such that said filter element may be operated at a flow rate of air to be filtered to filter surface area of at least about 4.0 to 5.0 cubic feet of air per minute per square foot of filter element surface area.
Claim 22
Dependent Claim
250 words
A porous media barrier type air filter unit, said filter unit including: a housing including means for conducting dust laden air into said housing and means for conducting filtered air from said housing; a filter element disposed in said housing and forming a porous media barrier for collecting particulate material impinging on said filter element; means for supporting said filter element in said housing, said filter element being constructed and arranged so as to define at least in part a clean air chamber for receiving air being filtered and which has flowed through said filter element; and reverse flow air jet nozzle means comprising a plurality of orifices arranged in a predetermined pattern for generating a jet of pressure air which expands to have a cross sectional shape conforming substantially to the cross sectional shape of said clean air chamber for inducting a relatively large volume of substantially ambient pressure air to flow in a direction opposite to the normal direction of flow of air which has been filtered out of said clean air chamber to backflush said filter element with a quantity of combined induced and jetted pressure air of such magnitude that particulate material impinged on said porous media barrier may be dislodged with force sufficient such that said filter element may be operated at a flow rate of air to be filtered to filter surface area of at least about 4.0 to 5.0 cubic feet of air per minute per square foot of filter element surface area.
Claim 23
Dependent Claim
251 words
A porous media barrier type air filter unit, said filter unit including: a housing including means for admitting dust laden air to said housing and means for conducting clean air out of said housing; a porous media filter element disposed in said housing; means for supporting said filter element in said housing, said filter element being constructed and arranged so as to define in part a clean air chamber for receiving air which has flowed through said filter element; reverse flow air jet nozzle means including a plurality of orifices arranged in a predetermined pattern so as to form overlapping air jets which expand to form a flowstream having a cross sectional shape corresponding substantially to the cross sectional shape of said clean air chamber and provide a stream of pressure air substantially entirely across said clean air chamber for backflushing said filter element to remove accumulations of particulate material thereon by flooding the media of said filter element with said pressure air; and means defining an outlet from said clean air chamber and having a cross sectional flow area not significantly less than the cross sectional flow area of said clean air chamber so as to minimize flow restriction of filtered air out of said clean air chamber and arranged such that said plurality of jets expand toward said means defining said outlet to form a seal around the periphery of said means defining said outlet between one end of said means defining said outlet and said clean air chamber.
Claim 24
Dependent Claim
251 words
A porous media barrier type air filter unit, said filter unit including: a housing including means for admitting dust laden air to said housing and means for conducting clean air out of said housing; a porous media filter element disposed in said housing; means for supporting said filter element in said housing, said filter element being constructed and arranged so as to define in part a clean air chamber for receiving air which has flowed through said filter element; reverse flow air jet nozzle means including a plurality of orifices arranged in a predetermined pattern so as to form overlapping air jets which expand to form a flowstream having a cross sectional shape corresponding substantially to the cross sectional shape of said clean air chamber and provide a stream of pressure air substantially entirely across said clean air chamber for backflushing said filter element to remove accumulations of particulate material thereon by flooding the media of said filter element with said pressure air; and means defining an outlet from said clean air chamber and having a cross sectional flow area not significantly less than the cross sectional flow area of said clean air chamber so as to minimize flow restriction of filtered air out of said clean air chamber and arranged such that said plurality of jets expand toward said means defining said outlet to form a seal around the periphery of said means defining said outlet between one end of said means defining said outlet and said clean air chamber.
Claim 25
Dependent Claim
199 words
A porous media barrier type air filter unit, said filter unit including: a housing including means for conducting dust laden air into said housing and means for conducting filtered air from said housing; a porous media filter element supported in said housing, said filter element being constructed and arranged so as to define at least in part a clean air chamber for receiving air which has flowed through said filter element; a divider structure disposed in said clean air chamber and including means for partitioning said clean air chamber into a plurality of separate subchambers; reverse flow air jet nozzle means comprising a plurality of orifices arranged in a predetermined pattern for discharging plural jets of pressure air to flow in a direction opposite to the normal direction of flow of air which has been filtered out of said clean air chamber to backflush said filter element, said nozzle means being arranged in such a way so as to generate plural sets of overlapping jets which flow into said subchambers, respectively, each of said sets of overlapping jets forming a flowstream of air having a cross sectional shape conforming substantially to the cross sectional shape of said subchambers, respectively.
Claim 26
Dependent Claim
199 words
A porous media barrier type air filter unit, said filter unit including: a housing including means for conducting dust laden air into said housing and means for conducting filtered air from said housing; a porous media filter element supported in said housing, said filter element being constructed and arranged so as to define at least in part a clean air chamber for receiving air which has flowed through said filter element; a divider structure disposed in said clean air chamber and including means for partitioning said clean air chamber into a plurality of separate subchambers; reverse flow air jet nozzle means comprising a plurality of orifices arranged in a predetermined pattern for discharging plural jets of pressure air to flow in a direction opposite to the normal direction of flow of air which has been filtered out of said clean air chamber to backflush said filter element, said nozzle means being arranged in such a way so as to generate plural sets of overlapping jets which flow into said subchambers, respectively, each of said sets of overlapping jets forming a flowstream of air having a cross sectional shape conforming substantially to the cross sectional shape of said subchambers, respectively.
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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) | 1988-09-30 | 1989-04-01 | 1989-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-30 | 1993-04-01 | 1993-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-30 | 1997-04-01 | 1997-10-01 | $7700.00 | Window Closed / Lapsed |