EP0515396B1 - Centrifuge with self-emptying centrifuging drum - Google Patents
Centrifuge with self-emptying centrifuging drum Download PDFInfo
- Publication number
- EP0515396B1 EP0515396B1 EP91902695A EP91902695A EP0515396B1 EP 0515396 B1 EP0515396 B1 EP 0515396B1 EP 91902695 A EP91902695 A EP 91902695A EP 91902695 A EP91902695 A EP 91902695A EP 0515396 B1 EP0515396 B1 EP 0515396B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- line
- centrifuge
- pressure
- valve
- discharge
- 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.)
- Expired - Lifetime
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B11/00—Feeding, charging, or discharging bowls
- B04B11/02—Continuous feeding or discharging; Control arrangements therefor
Definitions
- the invention relates to a centrifuge with a self-emptying centrifugal drum and with an inlet line for feeding the product to be centrifuged into the centrifugal drum and with at least one outlet line provided with an elastic line part for discharging a liquid phase under pressure from the centrifugal drum and with a device for Ejection of solids accumulating in the centrifugal drum in predefinable periods.
- centrifuges are generally known. To discharge the solid, so-called partial emptying can be carried out, in which only a small part of the drum content is discharged. This process leads to a sudden drop in pressure in the drum and thus also in the drain line. This can have a negative impact on the functioning of downstream equipment.
- skimming raw milk such as this. B. is known from DE-C-3539485
- the skimmed milk outlet of the centrifuge is fed to a heater, and there is also a heat exchange with the raw milk.
- a centrifuge is known from FR-A-1481803, in which a flow limiter is installed in the inlet line and in at least one outlet line, which is elastically deformable within its elastic limit.
- the quantity limiter is intended to avoid a change in the quantity ratio between two drain lines when the pressure changes.
- these devices are not able to compensate for the sudden drop in pressure in a discharge line which occurs in centrifugal drums with solid discharge devices when the solid is discharged.
- the elastic deformation of the drain pipe and the associated change in volume are so small with the materials usually used that no influence on the pressure drop can be expected.
- DE-A-2151475 describes a valve which is provided with a hose membrane which can be charged with compressed air from the outside. As a result, the passage cross section of the valve and thus also the amount of the medium flowing through it can be changed. Valves of this type are also suitable for keeping the pressure constant in a line through which a medium flows. If the flow is interrupted, as occurs when solids are ejected from a centrifugal drum in the centrifuge discharge lines, a pressure drop cannot be prevented.
- the object of the invention is the known centrifuge to further develop that even when the centrifuge is partially emptied, there is no pressure drop in the discharge line.
- the elastic line part is airtightly surrounded by a housing, and the housing is connected via a line with a valve arranged therein to a pressure source, the valve being in the open position before each solids discharge and the elastic line part thereby can be pressurized from the outside, whereby the elastic line part can be compressed in the pressure drop generated by the solids discharge in the drain line in such a way that a proportion of the volume of solids ejected in it can be displaced.
- the valve Before partial emptying is triggered, the valve is first opened and the elastic line part is thereby pressurized. If the described pressure drop occurs in the discharge line during the subsequent partial emptying, the elastic line part is compressed by the pressure applied from the outside and displaces a part of the product volume present in it, which corresponds to the amount of solid ejected. This process compensates for the pressure drop.
- the elastic line part is provided in a bypass line.
- the one for the product derivation specific line section can then consist of solid material as usual.
- valves are arranged in the drain line and the bypass line in such a way that the drain from the centrifuge can optionally be conducted exclusively via one of the two lines. This arrangement offers particular advantages in the circuit cleaning of the lines.
- the centrifuge has a second outlet line
- the valve is opened and product is briefly conveyed from the inlet to the second outlet line.
- valves The actuation of the valves and the triggering of the solids emptying takes place advantageously via a control unit.
- Compressed air is preferably used as the pressure medium.
- the centrifuge is designated by 1, to which the product to be centrifuged is fed via an inlet line 2.
- the liquid phases separated from one another in the centrifuge are discharged via the discharge line 3 and the second discharge line 4.
- the drain line 3 is provided with a bypass line 5 in which there is an elastic Line part 6 is located, which is surrounded airtight by a housing 7, which is connected via a line 8 with a valve 9 provided therein to a pressure source 10.
- a valve 11 is arranged in the drain line 3 and a valve 12 in the bypass line 5.
- the inlet line 2 is connected to the outlet line 4 via a second bypass line 13, in which a valve 14 is provided.
- the valve 9 is first opened and thereby the housing 7 is pressurized and thus also the elastic line part 6. If the partial emptying is triggered, the pressure in the centrifugal drum drops and part of the product in the discharge line 3 flows back into the drum. The quantity flowing back is replaced by product which is located in the elastic line part 6 because this is compressed as the pressure drop in the discharge line 3 begins due to the pressure difference which then arises.
- the valve 14 in the second bypass line 13 is also opened during the emptying process. Since the pressure drop caused by the emptying is only present for approx. 1 second, the short-term product inflow into the second drain line 4 is tolerable in many cases. After the emptying process has ended, the bypass line 5 is refilled by a connecting line 15.
- bypass line 5 and the drain line 3 can be rinsed separately by appropriate switching of the valves 11 and 12 in order to improve the cleaning effect.
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- Centrifugal Separators (AREA)
Abstract
Description
Die Erfindung bezieht sich auf eine Zentrifuge mit einer selbstentleerenden Schleudertrommel und mit einer Zulaufleitung für die Zuführung des zu zentrifugierenden Produktes in die Schleudertrommel sowie mit mindestens einer, mit einem elastischen Leitungsteil versehenen Ablaufleitung zur Abführung einer Flüssigkeitsphase unter Druck aus der Schleudertrommel und mit einer Vorrichtung zum Ausstoß in der Schleudertrommel sich ansammelnder Feststoffe in vorgebbaren Zeitabschnitten.The invention relates to a centrifuge with a self-emptying centrifugal drum and with an inlet line for feeding the product to be centrifuged into the centrifugal drum and with at least one outlet line provided with an elastic line part for discharging a liquid phase under pressure from the centrifugal drum and with a device for Ejection of solids accumulating in the centrifugal drum in predefinable periods.
Derartige Zentrifugen sind allgemein bekannt. Zum Ausstoß des Feststoffes können sogenannte Teilentleerungen durchgeführt werden, bei denen nur ein geringer Teil des Trommelinhaltes ausgetragen wird. Dieser Vorgang führt zu einem plötzlichen Druckabfall in der Trommel und damit auch in der Ablaufleitung. Dies kann die Arbeitsweise nachgeschalteter Apparaturen negativ beeinflussen.Such centrifuges are generally known. To discharge the solid, so-called partial emptying can be carried out, in which only a small part of the drum content is discharged. This process leads to a sudden drop in pressure in the drum and thus also in the drain line. This can have a negative impact on the functioning of downstream equipment.
Bei der Entrahmung von Rohmilch, wie dies z. B. aus der DE-C-3539485 bekannt ist, wird der Magermilchablauf der Zentrifuge einem Erhitzer zugeführt, wobei auch ein Wärmeaustausch mit der Rohmilch erfolgt. Es bestehen bereits Vorschriften, die vorschreiben, daß der Druck auf der Seite der pasteurisierten Magermilch immer höher sein muß als auf der Rohmilchseite. Beim Entleerungsvorgang kann dies aus den obengenannten Gründen nicht eingehalten werden.When skimming raw milk, such as this. B. is known from DE-C-3539485, the skimmed milk outlet of the centrifuge is fed to a heater, and there is also a heat exchange with the raw milk. There are already regulations which prescribe that the pressure on the pasteurized skimmed milk side must always be higher than on the raw milk side. For the reasons mentioned above, this cannot be complied with during the emptying process.
Aus der FR-A-1481803 ist eine Zentrifuge bekannt, bei der je ein Mengenbegrenzer in die Zulaufleitung und in mindestens eine Ablaufleitung eingebaut ist, die innerhalb ihrer Elastizitätzsgrenze elastisch verformbar ist. Durch die Mengenbegrenzer soll eine Veränderung des Mengenverhältnisses zwischen zwei Ablaufleitungen bei Druckänderung vermieden werden. Diese Vorrichtungen sind aber nicht in der Lage, den plötzlichen Druckabfall in einer Ablaufleitung zu kompensieren, der bei Schleudertrommeln mit Feststoffaustragsvorrichtungen beim Austrag des Feststoffes entsteht. Die elastische Verformung der Ablaufleitung und die damit verbundene Volumenveränderung sind bei den üblicherweise verwendeten Materialien so gering, daß dadurch keine Beeinflussung des Druckabfalls erwartet werden kann.A centrifuge is known from FR-A-1481803, in which a flow limiter is installed in the inlet line and in at least one outlet line, which is elastically deformable within its elastic limit. The quantity limiter is intended to avoid a change in the quantity ratio between two drain lines when the pressure changes. However, these devices are not able to compensate for the sudden drop in pressure in a discharge line which occurs in centrifugal drums with solid discharge devices when the solid is discharged. The elastic deformation of the drain pipe and the associated change in volume are so small with the materials usually used that no influence on the pressure drop can be expected.
In der DE-A-2151475 wird ein Ventil beschrieben, das mit einer Schlauchmembran versehen ist, die von außen mit Druckluft beaufschlagbar ist. Dadurch kann der Durchtrittsquerschnitt des Ventils und damit auch die Menge des durch ihn strömenden Mediums verändert werden. Derartige Ventile sind auch geeignet, um den Druck in einer ständig von einem Medium durchströmten Leitung konstant zu halten. Bei einer Unterbrechung der Strömung, wie sie beim Feststoffausstoß aus einer Schleudertrommel in den Ablaufleitungen der Zentrifuge auftritt, kann ein Druckabfall damit aber nicht verhindert werden.DE-A-2151475 describes a valve which is provided with a hose membrane which can be charged with compressed air from the outside. As a result, the passage cross section of the valve and thus also the amount of the medium flowing through it can be changed. Valves of this type are also suitable for keeping the pressure constant in a line through which a medium flows. If the flow is interrupted, as occurs when solids are ejected from a centrifugal drum in the centrifuge discharge lines, a pressure drop cannot be prevented.
Aufgabe der Erfindung ist es, die bekannte Zentrifuge so weiterzubilden, daß auch bei der Teilentleerung der Zentrifuge kein Druckabfall in der Ablaufleitung erfolgt.The object of the invention is the known centrifuge to further develop that even when the centrifuge is partially emptied, there is no pressure drop in the discharge line.
Diese Aufgabe wird dadurch gelöst, daß das elastische Leitungsteil von einem Gehäuse luftdicht umgeben ist, und das Gehäuse über eine Leitung mit einem darin angeordneten Ventil mit einer Druckquelle verbunden ist, wobei sich das Ventil vor jedem Feststoffaustrag in der geöffneten Position befindet und das elastische Leitungsteil dadurch von außen mit Druck beaufschlagbar ist, wodurch das elastische Leitungsteil bei dem durch den Feststoffaustrag erzeugten Druckabfall in der Ablaufleitung derart zusammenpreßbar ist, daß dadurch ein der ausgestoßenen Feststoffmenge entsprechender Anteil des in ihm vorhandenen Produktvolumens verdrängbar ist.This object is achieved in that the elastic line part is airtightly surrounded by a housing, and the housing is connected via a line with a valve arranged therein to a pressure source, the valve being in the open position before each solids discharge and the elastic line part thereby can be pressurized from the outside, whereby the elastic line part can be compressed in the pressure drop generated by the solids discharge in the drain line in such a way that a proportion of the volume of solids ejected in it can be displaced.
Vor der Auslösung einer Teilentleerung wird zunächst das Ventil geöffnet und das elastische Leitungsteil dadurch mit Druck beaufschlagt. Entsteht bei der anschließenden Teilentleerung der beschriebene Druckabfall in der Ablaufleitung, so wird das elastische Leitungsteil durch den von außen aufgegebenen Druck zusammengepreßt und verdrängt einen Teil des in ihm vorhandenen Produktvolumens, das der ausgestoßenen Feststoffmenge entspricht. Durch diesen Vorgang wird der Druckabfall kompensiert.Before partial emptying is triggered, the valve is first opened and the elastic line part is thereby pressurized. If the described pressure drop occurs in the discharge line during the subsequent partial emptying, the elastic line part is compressed by the pressure applied from the outside and displaces a part of the product volume present in it, which corresponds to the amount of solid ejected. This process compensates for the pressure drop.
In einer vorteilhaften Ausgestaltung ist das elastische Leitungsteil in einer Bypassleitung vorgesehen. Der für die produktableitung bestimmte Leitungsteil kann dann wie gewohnt aus festem Material bestehen.In an advantageous embodiment, the elastic line part is provided in a bypass line. The one for the product derivation specific line section can then consist of solid material as usual.
In einer weiteren vorteilhaften Ausgestaltung sind in der Ablaufleitung und der Bypassleitung Ventile derart angeordnet, daß der Ablauf aus der Zentrifuge wahlweise ausschließlich über eine der beiden Leitungen geleitet werden kann. Diese Anordnung bietet insbesondere Vorteile bei der Kreislaufreinigung der Leitungen.In a further advantageous embodiment, valves are arranged in the drain line and the bypass line in such a way that the drain from the centrifuge can optionally be conducted exclusively via one of the two lines. This arrangement offers particular advantages in the circuit cleaning of the lines.
Falls die Zentrifuge eine zweite Ablaufleitung besitzt, ist es vorteilhaft, die Zulaufleitung der Zentrifuge über eine zweite Bypassleitung mit einem darin vorgesehenen Ventil mit der zweiten Ablaufleitung zu verbinden. Während der Teilentleerung wird das Ventil geöffnet und kurzzeitig Produkt vom Zulauf in die zweite Ablaufleitung gefördert.If the centrifuge has a second outlet line, it is advantageous to connect the inlet line of the centrifuge to the second outlet line via a second bypass line with a valve provided therein. During partial emptying, the valve is opened and product is briefly conveyed from the inlet to the second outlet line.
Die Betätigung der Ventile und das Auslösen der Feststoffentleerungen erfolgt in vorteilhafter Weise über ein Steuergerät.The actuation of the valves and the triggering of the solids emptying takes place advantageously via a control unit.
Als Druckmedium wird bevorzugt Druckluft verwendet.Compressed air is preferably used as the pressure medium.
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird nachstehend näher erläutert.An embodiment of the invention is shown in the drawing and is explained in more detail below.
Mit 1 ist die Zentrifuge bezeichnet, der das zu zentrifugierende Produkt über eine Zulaufleitung 2 zugeführt wird. Die in der Zentrifuge voneinander getrennten flüssigen Phasen werden über die Ablaufleitung 3 und die zweite Ablaufleitung 4 abgeleitet. Die Ablaufleitung 3 ist mit einer Bypassleitung 5 versehen, in der sich ein elastisches Leitungsteil 6 befindet, das von einem Gehäuse 7 luftdicht umgeben ist, welches über eine Leitung 8 mit einem darin vorgesehenen Ventil 9 mit einer Druckquelle 10 verbunden ist. In der Ablaufleitung 3 ist ein Ventil 11 und in der Bypassleitung 5 ein Ventil 12 angeordnet. Die Zulaufleitung 2 steht über eine zweite Bypassleitung 13, in der ein Ventil 14 vorgesehen ist, mit der Ablaufleitung 4 in Verbindung.The centrifuge is designated by 1, to which the product to be centrifuged is fed via an
Bei der Beschickung der Zentrifuge mit Produkt über den Zulauf 2 werden die abgetrennten Flüssigkeitsphasen über die Ablaufleitung 3 und die zweite Ablaufleitung 4 unter Druck abgeleitet. Der jeweils optimale Druck wird durch nicht dargestellte Vorrichtungen eingestellt. Vor der Teilentleerung wird zunächst das Ventil 9 geöffnet und dadurch das Gehäuse 7 unter Druck gesetzt und damit auch das elastische Leitungsteil 6. Wird nun die Teilentleerung ausgelöst, fällt der Druck in der Schleudertrommel ab, und ein Teil des in der Ablaufleitung 3 befindlichen Produktes fließt in die Trommel zurück. Die zurückfließende Menge wird ersetzt durch Produkt, das sich im elastischen Leitungsteil 6 befindet, weil dieses mit beginnendem Druckab- fall in der Ablaufleitung 3 aufgrund der sich dann einstellenden Druckdifferenz zusammengedrückt wird. Auch das Ventil 14 in der zweiten Bypassleitung 13 wird während des Entleerungsvorganges geöffnet. Da der durch die Entleerung verursachte Druckabfall nur ca. 1 Sekunde vorhanden ist, ist der kurzzeitige Produktzulauf in die zweite Ablaufleitung 4 in vielen Fällen tolerabel. Nach Beendigung des Entleerungsvorganges wird die Bypassleitung 5 durch eine Verbindungsleitung 15 wieder aufgefüllt.When the centrifuge is loaded with product via the
Bei der Kreislaufreinigung der Ablaufleitung 3 können durch entsprechende Schaltung der Ventile 11 und 12 die Bypassleitung 5 und die Ablaufleitung 3 separat gespült werden, um den Reinigungseffekt zu verbessern.In the circuit cleaning of the
Claims (5)
- Centrifuge with a self-cleaning centrifugal bowl and with a feed line for feeding the product to be centrifuged into the centrifugal bowl as well as with at least one discharge line provided with a flexible line section for discharging the liquid phase under pressure from the centrifugal bowl and with a device for ejecting the solids accumulated in the centrifugal bowl at pre-selectable time intervals, characterised in that the flexible line connection (6) is surrounded by an airtight housing (7) and that the housing (7) is connected via a line (8) in which is located a valve (9) with a pressure source (10), whereby the valve (9) is in the open position prior to each solids ejection and the flexible line section (6) can thereby be subjected to pressure from outside, whereby, due to the drop in pressure in the discharge line (3) following the solids ejection, the flexible line section (6) is compressible to the extent that a portion of the product volume contained therein corresponding to the ejected solids volume can be displaced.
- Centrifuge in accordance with claim 1, characterised in that the discharge line (3) is provided with a bypass line (5) in which the flexible line section (6) is provided.
- Centrifuge in accordance with claim 1 or 2, characterised in that valves (11, 12) are arranged in the discharge line (3) and the bypass line (5) such that the discharge from the centrifuge (1) can alternatively be exclusively effected via one of the two lines (3, 5).
- Centrifuge in accordance with one of the claims 1 to 3, characterised in that the feed line (2) is connected to a second bypass line (13) with a valve (14) incorporated therein.
- Centrifuge in accordance with one of the claims 1 to 4, characterised in that the actuation of the valves (9,11,12,14) and the triggering of the solids ejection is effected via a control unit.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4004459A DE4004459C2 (en) | 1990-02-14 | 1990-02-14 | Process for operating a centrifuge with a self-draining centrifugal drum and centrifuge for carrying out the process |
| DE4004459 | 1990-02-14 | ||
| PCT/EP1991/000114 WO1991012081A1 (en) | 1990-02-14 | 1991-01-22 | Centrifuge with self-emptying centrifuging drum |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0515396A1 EP0515396A1 (en) | 1992-12-02 |
| EP0515396B1 true EP0515396B1 (en) | 1994-05-25 |
Family
ID=6400074
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP91902695A Expired - Lifetime EP0515396B1 (en) | 1990-02-14 | 1991-01-22 | Centrifuge with self-emptying centrifuging drum |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US5267937A (en) |
| EP (1) | EP0515396B1 (en) |
| DE (2) | DE4004459C2 (en) |
| DK (1) | DK0515396T3 (en) |
| IE (1) | IE66728B1 (en) |
| WO (1) | WO1991012081A1 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE505440C2 (en) * | 1995-05-02 | 1997-08-25 | Alfa Laval Ab | Method and centrifugal separator for separating two liquids |
| GB2301697B (en) * | 1995-06-01 | 1999-04-07 | Ronald Howard Brewis | Harmonica tuning system |
| US6906172B2 (en) * | 1998-03-10 | 2005-06-14 | Large Scale Biology Corporation | Flexible processing apparatus for isolating and purifying viruses, soluble proteins and peptides from plant sources |
| US9220295B2 (en) | 2010-12-01 | 2015-12-29 | R.J. Reynolds Tobacco Company | Tobacco separation process for extracting tobacco-derived materials, and associated extraction systems |
| US9661876B2 (en) | 2013-03-14 | 2017-05-30 | R.J. Reynolds Tobacco Company | Sugar-enriched extract derived from tobacco |
| US9301544B2 (en) | 2013-03-14 | 2016-04-05 | R.J. Reynolds Tobacco Company | Protein-enriched tobacco-derived composition |
| DE102015119165B4 (en) * | 2015-11-06 | 2022-06-09 | Gea Mechanical Equipment Gmbh | Process for clarifying a free-flowing product using a centrifuge, in particular a separator |
| DE102017115112A1 (en) | 2017-07-06 | 2019-01-10 | Gea Mechanical Equipment Gmbh | Plant for the centrifugal clarification of a suspension |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1023726B (en) * | 1956-08-02 | 1958-01-30 | Westfalia Separator Ag | Feed device for milk centrifuges for setting various constant outputs |
| FR1481803A (en) * | 1966-06-02 | 1967-05-19 | Westfalia Separator Ag | Device for maintaining constant the quantitative ratio of constituents extracted from a liquid by means of a centrifugal separator |
| DE2151475A1 (en) * | 1971-10-15 | 1973-04-19 | Kurt Pause | Regulating filtering centrifuge - to keep thickness of filtered solids layer constant during continuous discharge |
| JPS5437964A (en) * | 1977-08-30 | 1979-03-20 | Mitsubishi Kakoki Kk | Centrifugal separator |
| DE3340636A1 (en) * | 1983-11-10 | 1985-05-23 | Krauss-Maffei AG, 8000 München | METHOD AND DEVICE FOR PNEUMATICALLY EMPTYING CENTRIFUGES |
| DE3539485A1 (en) * | 1985-11-07 | 1987-05-21 | Alfa Laval Ind Tech | Process for controlling a milk processing apparatus |
-
1990
- 1990-02-14 DE DE4004459A patent/DE4004459C2/en not_active Expired - Fee Related
-
1991
- 1991-01-22 EP EP91902695A patent/EP0515396B1/en not_active Expired - Lifetime
- 1991-01-22 DE DE59101726T patent/DE59101726D1/en not_active Expired - Fee Related
- 1991-01-22 DK DK91902695.5T patent/DK0515396T3/en active
- 1991-01-22 WO PCT/EP1991/000114 patent/WO1991012081A1/en active IP Right Grant
- 1991-01-22 US US07/920,491 patent/US5267937A/en not_active Expired - Fee Related
- 1991-01-25 IE IE27391A patent/IE66728B1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| WO1991012081A1 (en) | 1991-08-22 |
| US5267937A (en) | 1993-12-07 |
| IE66728B1 (en) | 1996-01-24 |
| IE910273A1 (en) | 1991-08-14 |
| DK0515396T3 (en) | 1994-09-26 |
| EP0515396A1 (en) | 1992-12-02 |
| DE4004459C1 (en) | 1991-03-07 |
| DE59101726D1 (en) | 1994-06-30 |
| DE4004459C2 (en) | 1995-08-31 |
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