US3735873A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for screening aqueous suspensions, preferably fiber stock and/or fiber-pulp suspensions
Assignee: Sunds Sundsvall AB
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Filing: 1970-06-02
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Granted: 1973-05-29
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Expires: 1990-06-02
Abstract
Abstract An improvement in apparatus for screening aqueous suspensions and being of the type having a perforated, diluting-liquid cylinder adapted to rotate inside a co-axial, perforated, nonrotatable screening drum, and with which means are provided for supplying diluting liquid and suspension mixtures to the cylinder and drum respectively, the improvement being that the means which causes the diluting cylinder to rotate is at least partially enclosed by the means supplying said liquid to the cylinder and that means are provided for imparting to the liquid, prior to its entry into said cylinder, a determined speed of rotation, thereby preventing uneven distribution in the apparatus of the suspended material.
Inventors
- 👤 K E Bergstedt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:17
CPC Classifications
B; B07; B07B; B07B1/00; D; D21; D21D; D21D5/00; D21D5/02; D21D5/06; B07B2230/00; B07B2230/01
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
253 words
An apparatus for screening aqueous suspensions, such as fibrous suspensions, comprising a casing; a non-rotatable screening means mounted substantially horizontally in said casing; said screening means being in the form of a cylindrical drum; an inlet means for supplying aqueous suspension to the interior of the drum; said drum having screen openings and being at least partially open to provide communication with said inlet means; an outlet means for carrying away reject particles separated from the suspension during such screening operation; a supply means for diluent liquid comprising a rotatable liquidinlet chamber in which there are arranged guide vanes to cause the liquid to rotate; a rotatably mounted substantially horizontal distribution means for diluent liquid communicating with said diluting liquid supply means, said distribution means distributing, upon its rotation, the diluent liquid fed thereto out towards the surface of the screening drum; said diluent liquid supply means and said inlet means for supplying aqueous suspension being located at one end of the casing and said means being adapted to supply diluent liquid and aqueous suspension to the distribution means and to the screening drum, respectively, at the same end of the casing; said distribution means being floatingly supported from the one end of the casing at which end the supply means are located by means of a rotatably mounted member, said member being at least partially enclosed by the diluent liquid supply means; and an inspection portion provided in the end wall of said distribution means remote from said diluent liquid supply means.
Claim 2
Independent Claim
253 words
An apparatus for screening aqueous suspensions, such as fibrous suspensions, comprising a casing; a non-rotatable screening means mounted substantially horizontally in said casing; said screening means being in the form of a cylindrical drum; an inlet means for supplying aqueous suspension to the interior of the drum; said drum having screen openings and being at least partially open to provide communication with said inlet means; an outlet means for carrying away reject particles separated from the suspension during such screening operation; a supply means for diluent liquid comprising a rotatable liquidinlet chamber in which there are arranged guide vanes to cause the liquid to rotate; a rotatably mounted substantially horizontal distribution means for diluent liquid communicating with said diluting liquid supply means, said distribution means distributing, upon its rotation, the diluent liquid fed thereto out towards the surface of the screening drum; said diluent liquid supply means and said inlet means for supplying aqueous suspension being located at one end of the casing and said means being adapted to supply diluent liquid and aqueous suspension to the distribution means and to the screening drum, respectively, at the same end of the casing; said distribution means being floatingly supported from the one end of the casing at which end the supply means are located by means of a rotatably mounted member, said member being at least partially enclosed by the diluent liquid supply means; and an inspection portion provided in the end wall of said distribution means remote from said diluent liquid supply means.
Claim 3
Independent Claim
360 words
An apparatus for screening aqueous suspensions, such as fibrous suspensions, comprising a casing; a non-rotatable screening means mounted substantially horizontally in said casing; said screening means being in the form of a cylindrical drum; an inlet means for supplying aqueous suspension to the interior of the drum; said drum having screen openings and being at least partially open to provide communication with said inlet means; an outlet means for carrying away reject particles separated from the suspension during such screening operation; a supply means for diluent liquid; a rotatably mounted substantially horizontal distribution means for diluent liquid communicating with said diluting liquid supply means, said diluent liquid supply means comprising a rotatable liquid-inlet chamber in which there are arranged guide vanes extending radially outwards up to the periphery of the distribution means so as to cause the liquid to rotate prior to its entry into said distribution means; said liquid-inlet chamber being frusto-conical and at its base portion merging with or lying adjacent to the cylindrical surface of said distribution means, which inlet chamber communicates at its narrow end with the inlet portion of the diluent liquid supply means, so that the vanes arranged in the liquid-inlet chamber impart to diluent liquid, prior to its entry into said distribution means, a speed of rotation which is substantially equal to that of the diluent liquid previously supplied to said means; said distribution means distribuTing, upon its rotation, the diluent liquid fed thereto out towards the surface of the screening drum; said diluent liquid supply means and said inlet means for supplying aqueous suspension being located at one end of the casing and said means being adapted to supply diluent liquid and aqueous suspension to the distribution means and to the screening drum, respectively, at the same end of the casing; said distribution means being floatingly supported from the one end of the casing at which end the supply means are located by means of a rotatably mounted member, said member being at least partially enclosed by the diluent liquid supply means; and an inspection portion provided in the end wall of said distribution means remote from said diluent liquid supply means.
Claim 4
Independent Claim
360 words
An apparatus for screening aqueous suspensions, such as fibrous suspensions, comprising a casing; a non-rotatable screening means mounted substantially horizontally in said casing; said screening means being in the form of a cylindrical drum; an inlet means for supplying aqueous suspension to the interior of the drum; said drum having screen openings and being at least partially open to provide communication with said inlet means; an outlet means for carrying away reject particles separated from the suspension during such screening operation; a supply means for diluent liquid; a rotatably mounted substantially horizontal distribution means for diluent liquid communicating with said diluting liquid supply means, said diluent liquid supply means comprising a rotatable liquid-inlet chamber in which there are arranged guide vanes extending radially outwards up to the periphery of the distribution means so as to cause the liquid to rotate prior to its entry into said distribution means; said liquid-inlet chamber being frusto-conical and at its base portion merging with or lying adjacent to the cylindrical surface of said distribution means, which inlet chamber communicates at its narrow end with the inlet portion of the diluent liquid supply means, so that the vanes arranged in the liquid-inlet chamber impart to diluent liquid, prior to its entry into said distribution means, a speed of rotation which is substantially equal to that of the diluent liquid previously supplied to said means; said distribution means distribuTing, upon its rotation, the diluent liquid fed thereto out towards the surface of the screening drum; said diluent liquid supply means and said inlet means for supplying aqueous suspension being located at one end of the casing and said means being adapted to supply diluent liquid and aqueous suspension to the distribution means and to the screening drum, respectively, at the same end of the casing; said distribution means being floatingly supported from the one end of the casing at which end the supply means are located by means of a rotatably mounted member, said member being at least partially enclosed by the diluent liquid supply means; and an inspection portion provided in the end wall of said distribution means remote from said diluent liquid supply means.
Claim 5
Dependent Claim
42 words
Apparatus as defined in claim 2, wherein said distribution means is provided with securing means which are accessible from within said distribution means, and wherein said securing means can be reached through said opening in the end wall of said distribution means.
Claim 6
Dependent Claim
36 words
Apparatus as defined in claim 2, wherein said distribution means has an undivided cylindrical surface, on which are arranged blades for distributing fibrous suspension along the inside of the cylindrical surface of said non-rotating screening drum.
Claim 7
Dependent Claim
48 words
Apparatus as defined in claim 2, wherein the two spaces on either side of the surface of said distribution means, i.e. the space within the means itself and the space outside the same, communicate with an outlet for removing particles separated from the suspension during the screening operation.
Claim 8
Dependent Claim
39 words
Apparatus as defined in claim 1, wherein said casing enclosing the distribution means and the screening drum is secured to a frame structure in a manner which enables said casing to be removed axially without dismantling the screening drum.
Claim 9
Dependent Claim
32 words
Apparatus as defined in claim 6, wherein the non-rotatable screening drum is attached to said frame structure in a manner which enables said drum to be removed axially without dismantling the same.
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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) | 1976-05-28 | 1976-11-27 | 1977-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-28 | 1980-11-27 | 1981-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-28 | 1984-11-27 | 1985-05-29 | $7700.00 | Window Closed / Lapsed |