US3850803A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Atmospheric pressure filter
Assignee: Individual
•
Filing: 1973-06-27
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Granted: 1974-11-26
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Expires: 1993-06-27
Abstract
Abstract An atmospheric pressure filter comprising a container for liquid to be filtered, a rotatable, horizontally disposed filter drum mounted for rotation in the container beneath the level of liquid in the container, a plurality of spaced apart, elongate filter elements mounted in the drum and extending lengthwise thereof between opposite ends of the drum to filter the liquid, means connected with the filter drum to rotate the filter drum and to stop the filter drum at predetermined increments of rotation, and cleaning probe means supported adjacent one end of the filter drum for lengthwise insertion into one of the filter elements to progressively clean the filter element over its length when the drum is stopped, said cleaning probe means including means to effect reverse flow of filtered liquid through only a small portion at a time of the filter element to clean the filter element.
Inventors
- 👤 R Adams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:47
CPC Classifications
B; B01; B01D; B01D25/00; B01D25/32; B01D25/38; B01D33/00; B01D33/06
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
299 words
An atmospheric pressure filter comprising a container for liquid to be filtered, a horizontal tubular filter drum rotatably supported in the container beneath the level of liquid in the container, said drum including a liquid impervious, tubular side wall and opposite spaced apart liquid impervious end walls, a plurality of parallel, spaced apart open ended liquid pervious filter tubes secured at their opposite ends to the drum end walls and extending within the drum the length of the drum between the end walls and opening at their opposite ends outwardly through the end walls for flow of liquid from the container into the open ends of the filter tubes and through the sides of the filter tubes into the drum, an outlet for filtered liquid in one end of the drum, means operatively connected with the drum to rotate the drum and to intermittently stop the drum at predetermined increments of rotation, and at least one filter tube cleaning probe supported adjacent one end of the drum in position to be inserted lengthwise in an open end of a filter tube when the drum is stopped, means connected with the cleaning probe to move the probe into the tube and progressively along the length of the tube to clean the filter tube, said filter tube cleaning probe including means engaging and dislodging contaminants from the inside of the filter tube, said cleaning probe also including means to effect reverse flow of filtered liquid through the filter tube only over a small portion of the length of the fulter tube at a time and movable to progressively clean the filter tube over its entire length and thus requiring only a small amount of backwash liquid to obtain a large pressure differential across the filter tube to clean the filter tube.
Claim 2
Dependent Claim
299 words
An atmospheric pressure filter comprising a container for liquid to be filtered, a horizontal tubular filter drum rotatably supported in the container beneath the level of liquid in the container, said drum including a liquid impervious, tubular side wall and opposite spaced apart liquid impervious end walls, a plurality of parallel, spaced apart open ended liquid pervious filter tubes secured at their opposite ends to the drum end walls and extending within the drum the length of the drum between the end walls and opening at their opposite ends outwardly through the end walls for flow of liquid from the container into the open ends of the filter tubes and through the sides of the filter tubes into the drum, an outlet for filtered liquid in one end of the drum, means operatively connected with the drum to rotate the drum and to intermittently stop the drum at predetermined increments of rotation, and at least one filter tube cleaning probe supported adjacent one end of the drum in position to be inserted lengthwise in an open end of a filter tube when the drum is stopped, means connected with the cleaning probe to move the probe into the tube and progressively along the length of the tube to clean the filter tube, said filter tube cleaning probe including means engaging and dislodging contaminants from the inside of the filter tube, said cleaning probe also including means to effect reverse flow of filtered liquid through the filter tube only over a small portion of the length of the fulter tube at a time and movable to progressively clean the filter tube over its entire length and thus requiring only a small amount of backwash liquid to obtain a large pressure differential across the filter tube to clean the filter tube.
Claim 3
Dependent Claim
140 words
An atmospheric pressure filter as in claim 1, wherein said container has opposite end walls, opposite side walls and a bottom, an inlet in one of said walls for liquid to be filtered, an outlet for contaminants in one of said walls adjacent a bottom portion thereof, a rotatable drum support shaft extended axially through said drum in supporting relationship thereto and secured to the drum end walls at the centers of the drum end walls, opposite ends of said support shaft extended through openings in the container end walls and rotatably supported in bearing means, said outlet for filtered liquid comprising a tubular outlet fitting secured in one end wall of the drum and extending through the opening in one of the container end walls to convey filtered liquid from the interior of the drum to outside the container.
Claim 4
Dependent Claim
78 words
An atmospheric pressure filter as in claim 1, wherein said drum is cylindrical and said means to rotate the drum comprises a plurality of circumferentially spaced, radially projecting teeth on a peripheral marginal surface of one of said end walls, and a reciprocable actuating rod engageable with said teeth, one at a time, to rotate the drum through a predetermined increment of rotation, depending on the travel of said rod and the spacing and number of said teeth.
Claim 5
Dependent Claim
43 words
An atmospheric pressure filter as in claim 3, wherein said actuating rod is connected to a piston in a cylinder, means for admitting pressure fluid to said cylinder on alternate opposite sides of said piston to reciprocate said piston and thus said rod.
Claim 6
Dependent Claim
95 words
An atmospheric pressure filter as in claim 1, wherein said means to stop the drum at predetermined increments includes a plurality of grooves in an end surface of one of said end walls of said drum, and a reciprocable stop pin extending substantially perpendicular to said one end wall and in alignment with said grooves, said stop pin biased into engagement with said grooves so that as said drum is rotated, said stop pin is movable into a predetermined groove to hold said drum against reverse rotation when said drum is rotated said predetermined increment.
Claim 7
Dependent Claim
219 words
An atmospheric pressure filter as in claim 1, wherein said filter tube cleaning probe includes a tubular support housing secured to one end wall of said container and extending through an opening in said one end wall in axial alignment with one of said filter tubes, an elongate tubular cleaning probe reciprocably mounted in said support housing, an entry plug on one end of said cleaning probe of substantially the same diameter as the internal diameter of said filter tube and insertable into said filter tube for sliding movement therealong to engage and dislodge contaminants from the inner surface of the filter tube, a sealing ring means around said cleaning probe spaced from said entry plug and sealingly engageable with the inner surface of said filter tube to define a reverse flow cleaning zone between said entry plug and said sealing ring means, opening means in said cleaning probe in said cleaning zone establishing fluid communication between the cleaning zone and the interior of the tubular cleaning probe, and means connected with the hollow interior of the cleaning probe to establish suction in said cleaning probe and thus in said cleaning zone to effect reverse flow of filtered liquid through said filter tube and into the cleaning zone and thence through said cleaning probe to clean the filter tube.
Claim 8
Dependent Claim
66 words
An atmospheric pressure filter as in claim 6, wherein an elongate actuating shaft is connected to the other end of said cleaning probe, said shaft extending into a cylinder and connected to a piston in said cylinder, and means to control admission of pressure fluid to said cylinder on opposite sides of said piston to reciprocate said cleaning probe into and out of said filter tube.
Claim 9
Dependent Claim
78 words
An atmospheric pressure filter as in claim 2, wherein said drum is cylindrical and said means to rotate the drum comprises a plurality of circumferentially spaced, radially projecting teeth on a peripheral marginal surface of one of said end walls, and a reciprocable actuating rod engageable with said teeth, one at a time, to rotate the drum through a predetermined increment of rotation, depending on the travel of said rod and the spacing and number of said teeth.
Claim 10
Dependent Claim
43 words
An atmospheric pressure filter as in claim 8, wherein said actuating rod is connected to a piston in a cylinder, means for admitting pressure fluid to said cylinder on alternate opposite sides of said piston to reciprocate said piston and thus said rod.
Claim 11
Dependent Claim
95 words
An atmospheric pressure filter as in claim 9, wherein said means to stop the drum at predetermined increments includes a plurality of grooves in an end surface of one of said end walls of said drum, and a reciprocable stop pin extending substantially perpendicular to said one end wall and in alignment with said grooves, said stop pin biased into engagement with said grooves so that as said drum is rotated, said stop pin is movable into a predetermined groove to hold said drum against reverse rotation when said drum is rotated said predetermined increment.
Claim 12
Dependent Claim
220 words
An atmospheric pressure filter as in claim 10, wherein said filter tube cleaning probe includes a tubular support housing secured to one end wall of said container and extending through an opening in said one end wall in axial alignment with one of said filter tubes, an elonGate tubular cleaning probe is reciprocably mounted in said support housing, an entry plug on one end of said cleaning probe of substantially the same diameter as the internal diameter of said filter tube and insertable into said filter tube for sliding movement therealong to engage and dislodge contaminants from the inner surface of the filter tube, a sealing ring means around said cleaning probe spaced from said entry plug and sealingly engageable with the inner surface of said filter tube to define a reverse flow cleaning zone between said entry plug and said sealing ring means, opening means in said cleaning probe in said cleaning zone establishing fluid communication between the cleaning zone and the interior of the tubular cleaning probe, and means connected with the hollow interior of the cleaning probe to establish suction in said cleaning probe and thus in said cleaning zone to effect reverse flow of filtered liquid through said filter tube and into the cleaning zone and thence through said cleaning probe to clean the filter tube.
Claim 13
Dependent Claim
66 words
An atmospheric pressure filter as in claim 11, wherein an elongate actuating shaft is connected to the other end of said cleaning probe, said shaft extending into a cylinder and connected to a piston in said cylinder, and means to control admission of pressure fluid to said cylinder on opposite sides of said piston to reciprocate said cleaning probe into and out of said filter tube.
Claim 14
Dependent Claim
103 words
An atmospheric pressure filter as in claim 12, wherein said means for controlling pressure fluid to said cylinders each comprises a solenoid valve, and means operatively connected to said solenoid valves to operate the solenoid valves in synchronization with one another so that when said actuating rod reaches the limit of its travel to rotate said drum through said predetermined increment and said drum is stopped, said cleaning probe is actuated and inserted into a filter tube, and when said cleaning probe is withdrawn from said filter tube, said actuating rod is operated to advance said drum through another predetermined increment of rotation.
Claim 15
Dependent Claim
21 words
An atmospheric pressure filter as in claim 1, wherein there are two concentric rows of filter tubes supported in said housing.
Claim 16
Dependent Claim
32 words
An atmospheric pressure filter as in claim 14, wherein a pair of cleaning probes are operatively positioned in alignment with a pair of aligned filter tubes in the inner and outer rows.
Claim 17
Dependent Claim
170 words
An atmospheric pressure filter comprising a container for liquid to be filtered, a rotatable, horizontally disposed filter drum mounted for rotation in the container beneath the level of liquid in the container, a plurality of spaced apart, elongate filter elements mounted in the drum and extending lengthwise thereof between opposite ends of the drum to filter the liquid, means connected with the filter drum to rotate the filter drum and to stop the filter drum at predetermined increments of rotation, and cleaning probe means supported adjacent one end of the filter drum for lengthwise insertion into one of the filter elements to progressively clean the filter element over its length when the drum is stopped, said cleaning probe means including means to effect reverse flow of filtered liquid through only a small portion at a time of the filter element and movable along the length of the filter element to progressively clean the entire filter element, thus requiring only a small amount of backwash liquid to clean the filter element.
Claim 18
Dependent Claim
170 words
An atmospheric pressure filter comprising a container for liquid to be filtered, a rotatable, horizontally disposed filter drum mounted for rotation in the container beneath the level of liquid in the container, a plurality of spaced apart, elongate filter elements mounted in the drum and extending lengthwise thereof between opposite ends of the drum to filter the liquid, means connected with the filter drum to rotate the filter drum and to stop the filter drum at predetermined increments of rotation, and cleaning probe means supported adjacent one end of the filter drum for lengthwise insertion into one of the filter elements to progressively clean the filter element over its length when the drum is stopped, said cleaning probe means including means to effect reverse flow of filtered liquid through only a small portion at a time of the filter element and movable along the length of the filter element to progressively clean the entire filter element, thus requiring only a small amount of backwash liquid to clean the filter element.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |