US3870638A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulsating filter-thickener
Assignee: Individual
•
Filing: 1971-05-27
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Granted: 1975-03-11
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Expires: 1991-05-27
Abstract
Abstract A pulsating filter-thickener for continuous clarification of solutions, comprises a hollow vessel to be fed with and to discharge slurry. A hollow filter element is disposed in the vessel and two pulsating chambers are provided for cleaning the filter elements. One pulsating chamber communicates directly with the inner cavity of the filter element whereas the other pulsating chamber communicates directly with the exterior of the filtering element. The arrangement permits the simultaneous cleaning of the interior and the exterior of the filtering element.
Inventors
- 👤 Susanna Mikhailovna Karpacheva
- 👤 Jury Georgievich Karkhachev
- 👤 Valeryan Matveevich Muratov
- 👤 Leonid Solomonovich Raginsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:11
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/20; B01D29/00; B01D29/62; B01D29/70; B01D29/72; B01D33/00; B01D33/01; B01D33/03; B01D33/0307; B01D33/0315; B01D33/35; B01D33/37; B01D33/39; B01D33/44; B01D33/46; B01D33/463
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
198 words
A pulsating filter-thickener for continuous clarification of solutions, said thickener comprising a vessel; means for filling the vessel with a slurry to be clarified; at least one filter element having an inner cavity, said filter element being disposed in said vessel and immersed during filtration in the slurry; a first pulsator chamber connected to said inner cavity of said filter element to produce alternate high and low pressure pulses in said cavity and cause filtrate to enter the cavity and the first pulsator chamber during the low pressure pulses and flow back to the filter element during the high pressure pulses; a pipe connected to the First pulsator chamber for the discharge of filtrate therefrom during the high pressure pulses whereby a portion of the filtrate is withdrawn from the thickener during the high pressure pulses while another portion flows back through the filter element; a second pulsator chamber connected to said vessel to produce periodic pressure pulses to cause the slurry to flow in a pulsating, reciprocating fluid stream at the outside of the filter element and dislodge solid particles caked on the outside of the filter element; and means for discharging thickened slurry from said vessel.
Claim 2
Dependent Claim
198 words
A pulsating filter-thickener for continuous clarification of solutions, said thickener comprising a vessel; means for filling the vessel with a slurry to be clarified; at least one filter element having an inner cavity, said filter element being disposed in said vessel and immersed during filtration in the slurry; a first pulsator chamber connected to said inner cavity of said filter element to produce alternate high and low pressure pulses in said cavity and cause filtrate to enter the cavity and the first pulsator chamber during the low pressure pulses and flow back to the filter element during the high pressure pulses; a pipe connected to the First pulsator chamber for the discharge of filtrate therefrom during the high pressure pulses whereby a portion of the filtrate is withdrawn from the thickener during the high pressure pulses while another portion flows back through the filter element; a second pulsator chamber connected to said vessel to produce periodic pressure pulses to cause the slurry to flow in a pulsating, reciprocating fluid stream at the outside of the filter element and dislodge solid particles caked on the outside of the filter element; and means for discharging thickened slurry from said vessel.
Claim 3
Dependent Claim
198 words
A pulsating filter-thickener for continuous clarification of solutions, said thickener comprising a vessel; means for filling the vessel with a slurry to be clarified; at least one filter element having an inner cavity, said filter element being disposed in said vessel and immersed during filtration in the slurry; a first pulsator chamber connected to said inner cavity of said filter element to produce alternate high and low pressure pulses in said cavity and cause filtrate to enter the cavity and the first pulsator chamber during the low pressure pulses and flow back to the filter element during the high pressure pulses; a pipe connected to the First pulsator chamber for the discharge of filtrate therefrom during the high pressure pulses whereby a portion of the filtrate is withdrawn from the thickener during the high pressure pulses while another portion flows back through the filter element; a second pulsator chamber connected to said vessel to produce periodic pressure pulses to cause the slurry to flow in a pulsating, reciprocating fluid stream at the outside of the filter element and dislodge solid particles caked on the outside of the filter element; and means for discharging thickened slurry from said vessel.
Claim 4
Dependent Claim
198 words
A pulsating filter-thickener for continuous clarification of solutions, said thickener comprising a vessel; means for filling the vessel with a slurry to be clarified; at least one filter element having an inner cavity, said filter element being disposed in said vessel and immersed during filtration in the slurry; a first pulsator chamber connected to said inner cavity of said filter element to produce alternate high and low pressure pulses in said cavity and cause filtrate to enter the cavity and the first pulsator chamber during the low pressure pulses and flow back to the filter element during the high pressure pulses; a pipe connected to the First pulsator chamber for the discharge of filtrate therefrom during the high pressure pulses whereby a portion of the filtrate is withdrawn from the thickener during the high pressure pulses while another portion flows back through the filter element; a second pulsator chamber connected to said vessel to produce periodic pressure pulses to cause the slurry to flow in a pulsating, reciprocating fluid stream at the outside of the filter element and dislodge solid particles caked on the outside of the filter element; and means for discharging thickened slurry from said vessel.
Claim 5
Dependent Claim
29 words
A filter-thickener according to claim 1, comprising means disposed in the vessel around the filter element to direct said pulsating fluid stream onto the surface of said filter element.
Claim 6
Dependent Claim
24 words
A filter-thickener according to claim 2, wherein said means to direct the pulsating fluid stream comprises plates around the filter elements with apertures therein.
Claim 7
Dependent Claim
21 words
A filter-thickener according to claim 3, wherein said plates are inclined with respect to the outer surface of said filter element.
Claim 8
Dependent Claim
30 words
A filter-thickener according to claim 3, wherein said means to direct the pulsating fluid stream further comprises nozzles in said apertures facing said filter element and inclined with respect thereto.
Claim 9
Dependent Claim
87 words
A filter-thickener according to claim 2, wherein said means to direct the pulsating fluid stream comprises an annular manifold surrounding said filter element, said manifold having a perforate wall facing said filter element, said manifold being mounted in said vessel so as to connect said second pulsator chamber with the inner cavity of said manifold, whereupon the pulsating fluid stream is broken into individual streams by the perforate wall of said manifold to cause the individual streams to flow against the outer surface of the filter element.
Claim 10
Dependent Claim
53 words
A filter-thickener according to claim 2, wherein said filter element comprises a plurality of tubular filters, and said means to direct the pulsating fluid stream comprises a plurality of tubular manifolds disposed around said tubular filters, said manifolds being provided with apertures facing said tubular filters and connected to said second pulsator chamber.
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) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |