US3760948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Strainer device in vessels for treating cellulosic pulp
Assignee: Metso Fiber Karlstad AB
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Filing: 1972-01-31
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Granted: 1973-09-25
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Expires: 1992-01-31
Abstract
Abstract A standing cylindrical vessel for treating cellulosic pulp continuously fed therethrough, is provided with concentric strainer bodies having cylindrical faces and with rotary spray tubes having outlets for spreading a liquid in the pulp in circular paths between the strainer bodies. Liquid ejected through said outlets moves transversely of the pulp flow towards the strainer faces where liquid is withdrawn from the pulp. An impervious cylindrical wall or screen is located close to a liquid outlet moving between two strainer bodies and obstructs the flow therefrom in such a manner that the liquid flows merely or mainly towards one of said strainer bodies.
Inventors
- 👤 R Johansen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:46
CPC Classifications
D; D21; D21C; D21C9/00; D21C9/10; D21C9/1026; D21C9/1031; D21C9/02; D21D; D21D5/00; D21D5/18; D21D5/22
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
130 words
Strainer device in a standing cylindrical vessel adapted for maintaining an axial flow of pulp consisting of fiber material suspended in a liquid, said device comprising a set of concentric hollow stainer bodies placed at the same level and having essentially vertical strainer faces for withdrawing liquid from the pulp simultaneously into each strainer body, and outlets for spreading of liquid in the pulp located at approximately the same level as the strainer faces and moveable in paths concentric thereto, a liquid outlet moveable between two strainer bodies being located closer to an impervious cylindrical screen attached to the strainer bodies than an opposite pervious wall in one of said strainer bodies, in order to divert the liquid ejected from said outlet towards merely one of said two strainer bodies.
Claim 2
Dependent Claim
130 words
Strainer device in a standing cylindrical vessel adapted for maintaining an axial flow of pulp consisting of fiber material suspended in a liquid, said device comprising a set of concentric hollow stainer bodies placed at the same level and having essentially vertical strainer faces for withdrawing liquid from the pulp simultaneously into each strainer body, and outlets for spreading of liquid in the pulp located at approximately the same level as the strainer faces and moveable in paths concentric thereto, a liquid outlet moveable between two strainer bodies being located closer to an impervious cylindrical screen attached to the strainer bodies than an opposite pervious wall in one of said strainer bodies, in order to divert the liquid ejected from said outlet towards merely one of said two strainer bodies.
Claim 3
Dependent Claim
28 words
Device as claimed in claim 1, wherein the screen is formed by one cylindrical wall of a strainer body having strainer apertures merely in its other cylindrical wall.
Claim 4
Dependent Claim
51 words
Device as claimed in claim 1, wherein the screen is placed between and concentrically to two opposed strainer faces of neighbouring strainer bodies, and two liquid outlets are placed on opposite sides of the screen so that from the vicinity of the screen there depart liquid flows in opposite radial directions.
Claim 5
Dependent Claim
60 words
Device as claimed in claim 3, wherein a conduit for supply of liquid to the outlets comprises a vertical tube attached to a rotary shaft provided centrally in the vessel, said tube having end branches embracing and extending downwardly on opposite sides of the upper part of the screen said two liquid outlets being formed by orifices upon said branches.
Claim 6
Dependent Claim
143 words
In a vessel for cellulosic pulp, a strainer device for withdrawing liquid out of the pulp comprising at least one inner and outer concentric hollow strainer bodies, each one having an inner and an outer cylindrical wall, and means for spreading a liquid in a circular path in the space between said bodies, the improvement consisting in that the inner wall of said inner strainer body is pervious for withdrawing liquid of the pulp into the interior thereof and the outer wall of said inner strainer body is impervious, the outer strainer body having a pervious wall opposite to said impervious wall, and said means for spreading a liquid is located closer to the impervious wall than the opposite pervious wall whereby liquid of the pulp in the space between said bodies is withdrawn merely into the interior of the last-mentioned strainer body.
Claim 7
Dependent Claim
143 words
In a vessel for cellulosic pulp, a strainer device for withdrawing liquid out of the pulp comprising at least one inner and outer concentric hollow strainer bodies, each one having an inner and an outer cylindrical wall, and means for spreading a liquid in a circular path in the space between said bodies, the improvement consisting in that the inner wall of said inner strainer body is pervious for withdrawing liquid of the pulp into the interior thereof and the outer wall of said inner strainer body is impervious, the outer strainer body having a pervious wall opposite to said impervious wall, and said means for spreading a liquid is located closer to the impervious wall than the opposite pervious wall whereby liquid of the pulp in the space between said bodies is withdrawn merely into the interior of the last-mentioned strainer body.
Claim 8
Dependent Claim
124 words
In a vessel for cellulosic pulp, a strainer device for withdrawing liquid out of the pulp comprising at least one inner and outer concentric hollow strainer bodies, each one having an inner and outer pervious cylindrical wall for withdrawing liquid of the pulp into the interior thereof and means for spreading a liquid in a circular path in the space between said inner and outer strainer bodies, the improvement comprising an impervious screen placed between and concentrically to the outer pervious wall of the inner strainer body and the inner pervious wall of the outer strainer body, and two liquid outlets are placed on opposite sides of the impervious screen so that from the vicinity of the screen, liquid flows in opposite radial directions.
Claim 9
Dependent Claim
124 words
In a vessel for cellulosic pulp, a strainer device for withdrawing liquid out of the pulp comprising at least one inner and outer concentric hollow strainer bodies, each one having an inner and outer pervious cylindrical wall for withdrawing liquid of the pulp into the interior thereof and means for spreading a liquid in a circular path in the space between said inner and outer strainer bodies, the improvement comprising an impervious screen placed between and concentrically to the outer pervious wall of the inner strainer body and the inner pervious wall of the outer strainer body, and two liquid outlets are placed on opposite sides of the impervious screen so that from the vicinity of the screen, liquid flows in opposite radial directions.
Claim 10
Dependent Claim
62 words
A vessel as claimed in claim 6 wherein a conduit for supply of liquid to the outlets, comprises a vertical tube attached to a rotary shaft provided centrally in the vessel, said tube having end branches embracing and extending downwardly on opposite sides of the upper part of the impervious screen said two liquid outlets being formed by orifices upon said branches.
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) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |