EP0520321A1 - Centrifugeuse - Google Patents
Centrifugeuse Download PDFInfo
- Publication number
- EP0520321A1 EP0520321A1 EP92110303A EP92110303A EP0520321A1 EP 0520321 A1 EP0520321 A1 EP 0520321A1 EP 92110303 A EP92110303 A EP 92110303A EP 92110303 A EP92110303 A EP 92110303A EP 0520321 A1 EP0520321 A1 EP 0520321A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- centrifuge
- elongated structures
- hub
- suspension
- screw
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
- B04B1/20—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
- B04B1/20—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl
- B04B2001/205—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl with special construction of screw thread, e.g. segments, height
Definitions
- the invention relates to a centrifuge for the separation of a suspension into a solid phase and at least one liquid phase, in particular a decanter centrifuge with a downstream separator, solid bowl screw centrifuge or the like with a screw rotating around its casing with a differential speed, the spiral of which adjoins the course of the inner casing surface Seen in particular with regard to the discharge of solids, at least over a partial longitudinal region they are conically narrowed, are adapted at a short distance and between which the screw hub and the casing the separation space is formed, into which the suspension is fed, in particular through a cavity in the screw hub.
- Centrifuges for the separation of a liquid containing solids a so-called suspension, into a solid phase and one or more liquid phases are known.
- the suspension is accelerated inside the rotating centrifuge jacket, so that the solids, which are heavier than the clear liquid, settle towards the inside surface of the jacket.
- the solid is usually composed of a large number of particles of different sizes and / or weights. While the sedimentation of the coarse and heavy particles hardly poses any problems, this becomes more and more difficult or lengthy in the direction of the small, light particles.
- the invention has for its object to improve centrifuges of the type mentioned in terms of their separation result in terms of quality and quantity, and in particular with a view to saving time and material.
- this object is achieved in that elongated structures arranged in the manner of threads or bristles are provided over at least a portion of the longitudinal extent of the worm hub, which are flexible under attack of larger solid particles transversely to their longitudinal extent and which are at the latest under the action of centrifugal force in the operation of the centrifuge from the screw hub extending approximately radially into the separation space.
- cross-sectional shape or a change in shape seen in the longitudinal direction of the structures can be shaped differently and possibly adapted to the separation task, the simplest form being a round, constant cross-section is to be selected.
- band-shaped cross sections and / or tapering in the longitudinal direction can also be considered.
- the elongated structures help to accelerate the liquid in the direction of circulation, which also serves a better separation result, because the flow turbulence in the inlet area and its proximity without the structures impair the settling of the solid.
- the elongated structures can in principle be designed to be resilient in such a way that they are stiff to the extent that they increase their entrainment properties in the sense of the rotational acceleration of the suspension, so that they assume their radial stripping direction from the worm hub on their own, that is to say also without centrifugal force.
- the structures would then have the character of elastic bristles.
- the elongated structures are designed in a particularly preferred embodiment in the manner of threads without resilient elastic properties, so that they only develop under the centrifugal force that occurs during operation of the centrifuge extend radially into the separation space and thus into the pond.
- a bristle-like, spring-elastic design of the elongated structures can very well be provided throughout or a thread-like structure continuously. Different structures can preferably be used, for example in the inlet area with a bristle-like character and in the separating area outside the inlet with a thread-like character.
- a change in the stiffness character, carried out continuously or in stages, from the slurry inlet is possible via the separation path.
- the structures do not have to extend over the entire longitudinal region of the worm hub, they can also include partial regions, for example at least in the vicinity between the suspension inlet region the solids discharge.
- the screw spiral in this area, in particular in the clarification area facing away from the solids discharge in countercurrent centrifuges, in particular that between the suspension inlet and the clear liquid outlet, the screw spiral is interrupted, in such a way that the liquid can flow at least with a strong axial component, the spiral with regard to However, its task of solids transport is maintained so that it is not interrupted with regard to its axial discharge path.
- the threads which in principle can consist of any material, here chosen in view of the prevailing centrifugal forces and impingement of solids, preferably made of plastic, have a flexibility transversely to their longitudinal direction, which causes the elongated structures to deflect towards coarser solid particles, so that blockages accordingly be avoided.
- the attachment of the elongated structures to the worm hub is in principle arbitrary and can also be directed to holders which are arranged so as to be resistant to rotation and centrifugal force relative to the worm hub.
- a loop shape is provided in such a way that the central region is fixed to the worm hub or the holder and the two striving partial regions protrude into the separation space as two elongate structures.
- the figures show exemplary embodiments of solid-bowl screw centrifuges or their screws in a basically known design with a casing 1 and a screw 2, which is driven at a differential speed to the rapidly rotating casing 1, in accordance with the sense of pitch of the helix 4, which is from the outer circumference of the screw hub 3 is protruding, the plastic settling on the inner lateral surface is conveyed through the helix 4 to the solids discharge 13.
- a casing 1 and a screw 2 which is driven at a differential speed to the rapidly rotating casing 1, in accordance with the sense of pitch of the helix 4, which is from the outer circumference of the screw hub 3 is protruding, the plastic settling on the inner lateral surface is conveyed through the helix 4 to the solids discharge 13.
- the mirror of the suspension fed through the inlet opening 10 from an inlet cavity in the worm hub sets a slope, so that the radial thickness of the pond decreases from the suspension inlet 10 starting from the clear liquid outlet 14. Due to the resulting pressure difference between adjacent helical paths, a certain flow is established between the radial outer edge of the helix and the inner lateral surface, as a result of which solid matter deposited there can be partially whirled up again.
- the helix of the screw 2 reproduced there is designed to be interrupted in the axial region between the suspension inlet openings 10 and the end region of the clear liquid outflow which is provided for the conically narrowing end associated with the discharge of solids in such a way that helical sections 5 result which are offset from one another in the axial direction, but seen in this direction do not release any gaps, so that the solid to be conveyed by the spiral sections is transported in a correspondingly stepped manner.
- the intermittent execution of the helix 4 in sections 5 in this axial screw region creates an axial flow path for the liquid between the sections, so that the under-rinsing of the radially outer helix edges described with reference to FIG. 2 is omitted insofar as the pressure equalization takes place through axial flow.
- the screw region with an intermittent helical formation is also provided with a plurality of elongate structures 7 of thread-like character when viewed over the circumference of the screw hub. Since this is the clarification section of a countercurrent centrifuge outside the slurry inlet, the result is finer solid particles - the coarser particles settle in or near predominantly from the inlet area - so that here the thread-like structures primarily have to fulfill their task of collecting fine solids and therefore have to be fine, preferably becoming finer when viewed towards the clear liquid drain.
- FIG. 3 shows the principle of a countercurrent centrifuge, i.e. the suspension is passed through an inlet pipe 11 into the longitudinal central region of the worm hub and is fed there via inlet openings 10 into the separation chamber 6, so that the solid, coarser nature settling in the inlet region is fed to the solids discharge 13 in a short way, while especially the Area between the inlet 10 and the clear liquid outlet 14 settling finer solid must cover the correspondingly longer transport route.
- the countercurrent centrifuge according to FIG.
- the suspension is fed in via the inlet pipe 12 and corresponding inlet openings 10 at the beginning of the entire conveying path of the screw 2, so that the solid settling in the inlet area has to cover a correspondingly long transport route.
- the clarified liquid is drained off in the longitudinal central region of the screw and fed to the clear liquid outlet 14. Both types are known and need no further explanation here.
- the supplied suspension must be accelerated in the circumferential direction, which was previously done in this area by the inner surface of the jacket.
- the elongated structures 8 now arranged in this inlet area according to FIGS. 3 and 4 serve primarily for acceleration and are therefore stiffer than outside this area.
- the entraining effect of the elongated structures in the suspension inlet area also has a particularly favorable effect in that the inner surface area otherwise causing acceleration of the entered suspension is protected in this area with regard to its abrasion.
Landscapes
- Centrifugal Separators (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4120565 | 1991-06-21 | ||
DE4120565A DE4120565A1 (de) | 1991-06-21 | 1991-06-21 | Zentrifuge |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0520321A1 true EP0520321A1 (fr) | 1992-12-30 |
EP0520321B1 EP0520321B1 (fr) | 1995-09-20 |
Family
ID=6434473
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP92110303A Expired - Lifetime EP0520321B1 (fr) | 1991-06-21 | 1992-06-17 | Centrifugeuse |
Country Status (4)
Country | Link |
---|---|
US (1) | US5222935A (fr) |
EP (1) | EP0520321B1 (fr) |
DE (2) | DE4120565A1 (fr) |
DK (1) | DK0520321T3 (fr) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE505557C2 (sv) * | 1995-12-21 | 1997-09-15 | Alfa Laval Separation Ab | Dekantercentrifug |
BE1010851A3 (nl) * | 1997-01-15 | 1999-02-02 | Atlas Copco Airpower Nv | Vloeistofgeinjecteerde compressor met minstens twee samenwerkende compressorelementen. |
DE10055798A1 (de) * | 2000-11-10 | 2002-05-23 | Westfalia Separator Ind Gmbh | Schnecke für eine Vollmantel-Schneckenzentrifuge und Verfahren zur Ölgewinnung mit einer Vollmantel-Schneckenzentrifuge |
US20050082144A1 (en) * | 2003-10-14 | 2005-04-21 | Maupin Daniel D. | High speed food product peeling or cleaning machine and method |
US7527587B2 (en) * | 2007-04-17 | 2009-05-05 | Laughlin Henry J | Centrifugal separator and method for separating heavy and light matter in a substance |
CN106475234B (zh) * | 2015-08-26 | 2018-10-26 | 苏州瑞威离心分离技术有限公司 | 卧式螺旋卸料沉降离心机 |
CN114434686B (zh) * | 2020-10-19 | 2023-07-11 | 中国石油化工股份有限公司 | 塑料粉碎清洗分选设备及应用方法 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3260369A (en) * | 1962-12-14 | 1966-07-12 | Lou A Gruenewaelder | Means for centrifugally clarifying water containing sewage sludges and the like |
DE2907318A1 (de) * | 1979-02-24 | 1980-08-28 | Bayer Ag | Vollmantelschneckenzentrifuge mit angepasster schneckenwendel |
DE3501341A1 (de) * | 1984-12-22 | 1986-07-03 | Klöckner-Humboldt-Deutz AG, 5000 Köln | Vollmantel-schneckenzentrifuge |
GB2182869A (en) * | 1985-11-18 | 1987-05-28 | Decanter Pty Ltd | Decanter centrifuge |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE138809C (fr) * | ||||
US165228A (en) * | 1875-07-06 | Improvement in driers | ||
US2184598A (en) * | 1939-12-26 | G jahn | ||
US692011A (en) * | 1901-09-09 | 1902-01-28 | Martin Hansen | Barley-bearder and cereal-polisher. |
FR324335A (fr) * | 1902-09-10 | 1903-03-28 | Merckx Arthur | Dispositif pour bols de centrifuges séparateurs |
US1529750A (en) * | 1918-04-15 | 1925-03-17 | Pehr G Sieurin | Apparatus for drying finely-divided material such as peat, etc. |
US1417965A (en) * | 1921-12-27 | 1922-05-30 | G H Davis | Oil-treating mixer |
DE1279551B (de) * | 1963-07-11 | 1968-10-03 | Flottweg Motoren Werk Dr Georg | Vollmantel-Zentrifuge |
US3644103A (en) * | 1967-10-06 | 1972-02-22 | Upjohn Co | Countercurrent solid-liquid contacting using flexible bristle scre flight means |
US4243779A (en) * | 1979-04-23 | 1981-01-06 | Mcalister Roy E | Polycarbonates stabilized by halohydrocarbon, halocarbon or silane groups |
SU1174088A1 (ru) * | 1983-07-11 | 1985-08-23 | Предприятие П/Я В-2262 | Осадительна шнекова центрифуга |
-
1982
- 1982-06-17 US US07/900,158 patent/US5222935A/en not_active Expired - Fee Related
-
1991
- 1991-06-21 DE DE4120565A patent/DE4120565A1/de active Granted
-
1992
- 1992-06-17 EP EP92110303A patent/EP0520321B1/fr not_active Expired - Lifetime
- 1992-06-17 DE DE59203723T patent/DE59203723D1/de not_active Expired - Lifetime
- 1992-06-17 DK DK92110303.2T patent/DK0520321T3/da active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3260369A (en) * | 1962-12-14 | 1966-07-12 | Lou A Gruenewaelder | Means for centrifugally clarifying water containing sewage sludges and the like |
DE2907318A1 (de) * | 1979-02-24 | 1980-08-28 | Bayer Ag | Vollmantelschneckenzentrifuge mit angepasster schneckenwendel |
DE3501341A1 (de) * | 1984-12-22 | 1986-07-03 | Klöckner-Humboldt-Deutz AG, 5000 Köln | Vollmantel-schneckenzentrifuge |
GB2182869A (en) * | 1985-11-18 | 1987-05-28 | Decanter Pty Ltd | Decanter centrifuge |
Non-Patent Citations (1)
Title |
---|
DATABASE WPIL Section Ch, Week 8610, 22. März 1986 Derwent Publications Ltd., London, GB; Class J01, AN 86-067725/10 & SU-A-1 174 088 (MINAKER V.E.) 23. August 1985 * |
Also Published As
Publication number | Publication date |
---|---|
DE4120565A1 (de) | 1992-12-24 |
DK0520321T3 (da) | 1995-11-06 |
DE59203723D1 (de) | 1995-10-26 |
US5222935A (en) | 1993-06-29 |
DE4120565C2 (fr) | 1993-05-06 |
EP0520321B1 (fr) | 1995-09-20 |
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