EP1732697A1 - Solid-wall centrifuge comprising a weir provided with a stationary deflector plate - Google Patents
Solid-wall centrifuge comprising a weir provided with a stationary deflector plateInfo
- Publication number
- EP1732697A1 EP1732697A1 EP05716484A EP05716484A EP1732697A1 EP 1732697 A1 EP1732697 A1 EP 1732697A1 EP 05716484 A EP05716484 A EP 05716484A EP 05716484 A EP05716484 A EP 05716484A EP 1732697 A1 EP1732697 A1 EP 1732697A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- solid bowl
- centrifuge according
- disc
- bowl centrifuge
- drum
- 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
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
- B04B2001/2083—Configuration of liquid outlets
Definitions
- the invention relates to a Vollmantelzentri uge according to the preamble of claim 1.
- a generic solid bowl centrifuge is known from EP 0 702 599 B1 and US 5,593,377. These two documents disclose a solid-bowl screw centrifuge with a drum which has a weir which is provided with a passage for discharging a liquid phase which has been separated off in the centrifugal drum, the passage being associated with a throttle disk which is designed as a non-rotating part, the distance to the passage is variable, so that an adjustment of the liquid level in the centrifugal drum is possible by an axial adjustment of the throttle disc.
- the stationary throttle disc does not adversely affect the operation of the centrifugal drum, and in particular there is no adverse braking effect due to the liquid passing through the annular gap between the rotating weir and the stationary liquid disc.
- the annular gap creates a flow resistance that is greater the smaller the axial distance between the weir and the throttle plate.
- DE PS 966 080 shows a solid-bowl screw centrifuge, the liquid discharge of which is directed radially outwards from the drum, where the liquid is collected in a kind of annular space with an almost circular cross section.
- DE 706 968 also shows liquid discharges directed radially outward from the drum.
- DE 25 15 452 AI also shows behind the axially directed liquid discharges a plate rotating with the drum, which deflects the escaping liquid by 180 ° in the opposite axial direction.
- the US 20 83 899 shows a centrifuge with a vertical axis of rotation without throttle disc.
- the FR 20 57 600 and FR 20 54 722 each show full-bowl screw centrifuges with a liquid discharge directed axially to the axis of rotation, where escaping liquid can spray back onto the drum from a wall behind the outlets.
- the object of the invention is to implement a more gentle discharge of the liquid phase from the weir in a simple manner.
- the deflection disk is not a flat disk, but rather a kind of “sleeve-like” component with an inner diameter that changes - in this case enlarging - over at least part of the axial extension or the entire axial extension.
- the deflection disk thus has a defined axial extent (in the extension of the axis of rotation of the drum) as well as an inner and an outer jacket, the distance between the inner jacket and the axis of rotation not being constant but widening or increasing.
- the widening deflection disk preferably has an opening angle ⁇ to a plane running perpendicular to the axis of rotation D of the drum or parallel to the drum cover, which is greater than 0 ° and less than 90 °. So that shows widening deflection disc on the inner jacket at an angle of 90 ° - ⁇ to the axis of rotation (D) of the drum, which is greater than 0 ° and less than 90 °.
- the deflecting disc preferably has such a shape and is arranged or integrated in the arrangement in such a way that the liquid first emerges axially outwards from the drum until it hits a wall or disc from which it essentially radially outwards splashes, where it strikes the widening deflection plate, which prevents the escaping liquid from directly striking the wall (s) of the trap chamber, in particular walls parallel to the Drewhaxis, so that the noise level is reduced compared to an arrangement without a deflection plate.
- the liquid initially flows axially - i.e. parallel to the axis of rotation of the drum - outwards from the drum until it meets a wall from which it is directed essentially radially outwards. Here it meets the expanding deflection disc, which prevents the escaping liquid from reaching the drum again.
- the expanding geometry of the baffle has several advantages. On the one hand, it makes it possible to significantly reduce the operating noise of the centrifuge, since the liquid no longer splashes directly out of the annular gap, in particular between the throttle disc or another component and the drum cover, against walls of the capture chamber, but is deflected by an angle that corresponds to the opening angle of the deflection disc equivalent. As a result, the liquid no longer strikes the housing walls of the trap chamber perpendicularly, which significantly reduces the noise. In practice this is in view of the high speeds of e.g. 3500 rpm a big advantage.
- the "gentler” impact of a liquid jet on the walls of the trap chamber also reduces foam formation in the case of products which tend to foam.
- Another advantage is a reduction in the power consumption due to the fact that it initially drains rapidly from the inner area, in particular away from the surface of the centrifugal drum.
- annular gap is formed between the passage and a throttle disk outside the centrifugal drum or between the passage and another component, which directs the liquid radially outward and which is preferably completely or partially surrounded by the widening deflection disk over its axial extent, so that the direct radial ejection of the liquid phase from this annular gap is prevented.
- the deflection plate has an advantageous effect, since it prevents the escaping liquid from hitting the drum again.
- the inner diameter of the deflection disk is preferably larger than the outer diameter on which the passage openings of the centrifugal drum are arranged.
- the deflecting disc preferably adjoins the passage openings axially directly, so that an escape of liquid between the drum cover and the deflecting disc is prevented.
- approaches are provided on the passage openings - sleeves or the like - which axially overlap the deflection disk.
- the deflection disk has a ring-like, conically widening shape.
- the opening angle of the inner jacket of the deflection disk is preferably between 5 and 45 °, in particular 10 to 30 °.
- the last-mentioned angular range in particular enables particularly advantageous results, in particular particularly clear noise reduction, to be achieved.
- the opening angle of the deflection disk can be constant or change over its axial extent and / or in the circumferential direction.
- a multi-part, in particular two-part design of the deflection disk is also conceivable in order to implement its expanding shape in a simple manner.
- FIG. 1 shows a section through the axial end region of a full-shell centrifuge according to the invention with a deflection disk;
- FIG. 2 shows an enlarged detail from FIG. 1 with a simplified exemplary representation of the flow conditions;
- FIG. 3 shows a section through the axial end region of a second full-bowl centrifuge according to the invention
- FIG. 4 shows an enlarged detail from FIG. 3 with a simplified exemplary representation of the flow conditions
- FIG. 5 shows a section through the axial end region of a third solid bowl centrifuge according to the invention according to FIG. 3 with an alternative type of fastening of the deflection disk;
- FIG. 6 shows a section through the axial end region of a third full-shell centrifuge according to the invention according to FIG. 3 with a further alternative type of attachment of the deflection disk.
- FIG. 1 shows a solid bowl centrifuge designed as a solid bowl screw centrifuge with a rotatable centrifugal drum 1 with a horizontal axis of rotation.
- a rotating screw 2 is arranged in the centrifugal drum 1, a differential speed being maintained between the centrifugal drum 1 and the screw 2 during operation.
- the centrifugal drum 1 is closed by an axial drum cover 3, which is provided with at least one weir 4 - fixed or adjustable by means of diaphragms 13 - for discharging a liquid phase from the centrifugal drum.
- the weir 4 comprises a passage with at least one or more passage openings 5 in the drum cover 3 and with a throttle disk 6 arranged outside the centrifugal drum 3 in front of the passage openings 5, which is designed as a part that does not rotate during operation and whose distance from the passage openings 5 is variable.
- a collar-like extension 19 of the weir axially from the drum cover 3. This can be implemented e.g. by means of sleeves in / on the passage openings 5 or by means of a ring or a second diaphragm of a different diameter.
- the change in the axial distance between the passage openings 5 and the throttle disk 6 can be done, for example, by moving axially by moving or pivoting the throttle disk 6 in front of the passage openings 5, e.g. by means of actuators.
- the construction corresponds in principle to the generic state of the art.
- the throttle disk 6 is assigned a ring-shaped deflection disk (or “deflection sleeve”) 12, which here has a particularly advantageous conical shape, the deflection disk 12 preferably covering and covering the annular gap 8 over its entire length widens away from the passage openings 5.
- the opening angle ⁇ of the inner jacket 7 of the deflection disk 12 - see FIG. 2 - relative to the perpendicular to the axis of rotation D of the drum or to a plane E running parallel to the drum cover is between preferably 5 and 45 °, in particular between 10 ° and 30 °.
- the opening angle ⁇ is preferably constant over the entire radial and axial extent of the deflection disk 12. But it can also change suddenly or continuously, for example at a bend from 15 to 20 °.
- a multi-part, in particular two-part design of the deflection disk 12 is also conceivable in order to implement the expanding shape of the deflection disk 12 in a simple manner.
- the optimized discharge from the annular gap 8 can be clearly seen, while avoiding a direct escape of the liquid phase L in the radial direction.
- the liquid therefore no longer occurs on the wall 9 of the capture chamber, which extends essentially parallel to the axis of rotation.
- This significantly reduces noise which is a clear advantage in view of the preferred - but not exclusive - range of application for drum diameters of far more than 500 mm. Noise limits are more easily maintained or only reached at higher speeds. Power losses are also avoided if the liquid no longer hits the drum or the bearing hub when it has exited it.
- the opening angle is selected such that the wall 9 on the outside of the capture chamber 11 is not directly reached by the emerging product jet.
- the weir comprises the passage openings 5 in the drum cover 3 but no throttle disk 6.
- the liquid rather flows directly against another component - here an annular disk 14 in front of or on a gearbox 18 - which is designed as a part that does not rotate during operation.
- the flow conditions are optimized here similar to FIG. 2 (see FIG. 4).
- the deflecting disk 12 can also have an extension which is greater relative to the axial length of the annular gap 8 'than shown in the figures.
- the deflection plate 12 which is preferably made of sheet metal or sheet metal, can be fastened in various ways, for example by means of bolts 15 or 16 in an axial (FIGS. 1 and 3) or radial (FIG. 5) orientation, which are different from the surrounding walls 9, or 10 extend to the deflection plate 12 or by means of a particularly advantageous stabilizing flat ring 17 between the outer jacket of the deflection plate 12 and the wall 9 (FIG. 6).
- the arrangement of the fastening bolts or the fastening ring 17 in the radial direction reduces the risk of erosion thereof, since this is arranged in the flow shadow of the deflection disk 12.
- the number of fastening bolts can be varied and will generally be at least three.
Landscapes
- Centrifugal Separators (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE202004005353U DE202004005353U1 (en) | 2004-04-06 | 2004-04-06 | Solid bowl centrifuge with a weir with a throttle disc |
PCT/EP2005/003399 WO2005097336A1 (en) | 2004-04-06 | 2005-03-31 | Solid-wall centrifuge comprising a weir provided with a stationary deflector plate |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1732697A1 true EP1732697A1 (en) | 2006-12-20 |
EP1732697B1 EP1732697B1 (en) | 2016-05-04 |
EP1732697B9 EP1732697B9 (en) | 2016-10-19 |
Family
ID=34877804
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05716484.0A Not-in-force EP1732697B9 (en) | 2004-04-06 | 2005-03-31 | Solid-wall centrifuge comprising a weir provided with a stationary deflector plate |
Country Status (6)
Country | Link |
---|---|
US (1) | US7753834B2 (en) |
EP (1) | EP1732697B9 (en) |
CN (1) | CN1938099B (en) |
DE (1) | DE202004005353U1 (en) |
DK (1) | DK1732697T3 (en) |
WO (1) | WO2005097336A1 (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10203652B4 (en) * | 2002-01-30 | 2006-10-19 | Westfalia Separator Ag | Solid bowl centrifuge with a weir |
DE202004005353U1 (en) * | 2004-04-06 | 2005-08-18 | Westfalia Separator Ag | Solid bowl centrifuge with a weir with a throttle disc |
DK176946B1 (en) * | 2007-05-09 | 2010-06-14 | Alfa Laval Corp Ab | Centrifugal separator and a liquid phase drain port element |
DK200801848A (en) | 2008-12-30 | 2010-07-01 | Alfa Laval Corp Ab | A decanter centrifuge and a decanter centrifuge discharge port memeber. |
US9321058B2 (en) * | 2010-07-01 | 2016-04-26 | Centrisys Corp. | Centrifugal liquid separation machine to efficiently flow multi-phase solids from a heavy phase discharge stream with a solids plow |
DK178254B1 (en) * | 2010-11-12 | 2015-10-12 | Alfa Laval Corp Ab | Centrifugal separator, abrasion resistant element and set of abrasion resistant elements for a centrifugal separator |
US8956272B2 (en) * | 2011-12-30 | 2015-02-17 | Vanderbeken Ent. Ltd | Method and apparatus for removal of tars or resins from a scrubber liquid using a centrifuge with a discharge chamber scraper |
DE102012106226A1 (en) * | 2012-07-11 | 2014-01-16 | Gea Mechanical Equipment Gmbh | Solid bowl centrifuge with overflow weir |
DE102019135215A1 (en) * | 2019-12-19 | 2021-06-24 | Flottweg Se | Cross disk of a centrifuge screw and solid bowl screw centrifuge |
Family Cites Families (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2083899A (en) * | 1932-11-30 | 1937-06-15 | Centrifuge Company | Apparatus for centrifugal separation |
DE706968C (en) * | 1936-06-23 | 1941-06-10 | Gutehoffnungshuette Oberhausen | Slingshot for liquids with muddy to fine-grained components |
DE966080C (en) * | 1941-08-14 | 1957-07-04 | Starcosa Maschinen Und Appbau | Centrifugal separator |
NL157912B (en) | 1941-08-14 | Schering Ag | ||
FR2054722A5 (en) * | 1969-07-24 | 1971-05-07 | Saget Pierre | Centrifuge sepg two liquids and a solid |
FR2057600A5 (en) * | 1969-08-29 | 1971-05-21 | Saget Pierre | Centrifuge with modified solids discharge - conveyor |
FR2120537A5 (en) * | 1971-01-07 | 1972-08-18 | Saget Pierre | Continuous centrifugal separator - for liquids of similar density applicable with sediment present |
DE2515452A1 (en) * | 1975-04-09 | 1976-10-21 | Mono Pumps Ltd | Centrifuge - auger has flights to separate solid and liquid material |
DE2901607C2 (en) * | 1979-01-17 | 1981-03-12 | Westfalia Separator Ag, 4740 Oelde | Solid bowl screw centrifuge |
SE459234B (en) * | 1987-10-15 | 1989-06-19 | Alfa Laval Marine Power Eng | SEAT AND EQUIPMENT MAKES INTERIOR DISCOVERY OF A Centrifuge Rotor |
CN2157195Y (en) * | 1992-10-23 | 1994-02-23 | 农业部种子项目办公室 | Centrifugal for removing linters of cotton seeds with diluted sulfuric acid |
DE4320265C2 (en) * | 1993-06-18 | 1995-08-03 | Westfalia Separator Ag | Weir for solid jacket centrifugal drums |
JP3543597B2 (en) * | 1997-12-22 | 2004-07-14 | 株式会社クボタ | Separation water discharge device in horizontal centrifuge |
JPH11197547A (en) * | 1998-01-13 | 1999-07-27 | Kubota Corp | Device of discharging separated water in a horizontal type centrifugal separator |
DE19948115A1 (en) * | 1999-10-06 | 2001-04-12 | Baker Hughes De Gmbh | Centrifuge for separating solid-liquid mixtures |
DE10021983A1 (en) | 2000-05-05 | 2001-11-08 | Baker Hughes De Gmbh | Solid bowl centrifuge has an adjustable weir consisting of an annular plate connected to the centrifuge housing and fixed to cover the liquid openings of the centrifuge drum from the outside |
DE202004005353U1 (en) * | 2004-04-06 | 2005-08-18 | Westfalia Separator Ag | Solid bowl centrifuge with a weir with a throttle disc |
-
2004
- 2004-04-06 DE DE202004005353U patent/DE202004005353U1/en not_active Expired - Lifetime
-
2005
- 2005-03-31 US US10/594,554 patent/US7753834B2/en not_active Expired - Fee Related
- 2005-03-31 DK DK05716484.0T patent/DK1732697T3/en active
- 2005-03-31 WO PCT/EP2005/003399 patent/WO2005097336A1/en active Application Filing
- 2005-03-31 EP EP05716484.0A patent/EP1732697B9/en not_active Not-in-force
- 2005-03-31 CN CN2005800101571A patent/CN1938099B/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO2005097336A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN1938099A (en) | 2007-03-28 |
DK1732697T3 (en) | 2016-08-22 |
EP1732697B9 (en) | 2016-10-19 |
DE202004005353U1 (en) | 2005-08-18 |
CN1938099B (en) | 2010-07-07 |
US7753834B2 (en) | 2010-07-13 |
US20080248940A1 (en) | 2008-10-09 |
EP1732697B1 (en) | 2016-05-04 |
WO2005097336A1 (en) | 2005-10-20 |
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