EP1141643B1 - Centrifugal dehydrator - Google Patents

Centrifugal dehydrator Download PDF

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Publication number
EP1141643B1
EP1141643B1 EP00901054A EP00901054A EP1141643B1 EP 1141643 B1 EP1141643 B1 EP 1141643B1 EP 00901054 A EP00901054 A EP 00901054A EP 00901054 A EP00901054 A EP 00901054A EP 1141643 B1 EP1141643 B1 EP 1141643B1
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Prior art keywords
hollow body
centrifugal dryer
dryer according
rotor
centrifugal
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EP00901054A
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German (de)
French (fr)
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EP1141643A1 (en
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Günther Hultsch
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
    • F26B17/24—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by shooting or throwing the materials, e.g. after which the materials are subject to impact
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B5/00—Drying solid materials or objects by processes not involving the application of heat
    • F26B5/08—Drying solid materials or objects by processes not involving the application of heat by centrifugal treatment

Definitions

  • the invention relates to a device for a centrifugal dehumidifier for the separation and dehumidification of granules.
  • Centrifugal dehumidifiers are used, for example, to dehumidify Plastic granules used. It is easy to clean Process rooms important because when changing the granulate color or Sort the mix of granules or fragments of the previous one must be avoided with the new batch. Furthermore are long service life of the device parts, low abrasion of the parts to be dehumidified Granules and low noise emissions are important.
  • centrifugal dehumidifiers according to the German published documents DE 195 37 41 A1, DE 43 30 078 A1 and DE 28 19 443 A1 and according to US patent 5,611,150 consist of a housing in which a Hollow body made of seven, rotatable with conveyor blades mounted, vertically arranged rotor coaxially encloses.
  • the sieves either form a closed cylinder or are segmented. she extend from the floor to the one at the top, Granules drop zone and are only used by fasteners as well possibly interrupted by a feed chute.
  • the suspension of granules and liquid becomes the lower area the centrifugal dehumidifier continuously fed, in the Space between the rotor and the hollow body formed from sieves. It is gripped by the rotating blades of the rotor, which is both an upward transport pulse and Transfer centrifugal forces to the suspension.
  • the Granules both transported upwards and between the sieves and tossing the shovels back and forth while those of the Granules separate liquid through the sieves and through the drain nozzle of the housing that houses the centrifugal dehumidifier is derived.
  • Centrifugal dehumidifiers of this type have proven themselves in principle. adversely is the contamination of the sieves with fragments of the granules, so that these screens are disassembled and cleaned before every color or type change or need to be replaced. Sieves also wear out relatively strong, are easily damaged when they are changed frequently generate abrasion on the granules to be dehumidified. For dehumidification of highly abrasive granules, such as with glass fibers filled plastic granules, they are therefore unsuitable. Still is the sound emitted by the impact of the granules on the sieves is considerable.
  • centrifugal dehumidifiers can be used isolate against excessive sound emissions, but this insulation is complex, because the accessibility of the sieves can be closed, such as folding doors, etc., on the housings.
  • the invention has for its object to a centrifugal dehumidifier create that reduces the abrasion of the granules.
  • an essential part is preferred at least in the upper area of the hollow body, as an unperforated jacket educated.
  • the liquid separated from the granules flows in Influence of centrifugal and gravitational acceleration on the inner wall of the unpunched jacket spiral down.
  • the unperforated Coat with its smooth inner surfaces causes little wear.
  • the unperforated cladding causes little sound, so that the hollow body where it is designed as an unperforated jacket, can also serve as an outer housing.
  • the lower region of the hollow body is preferably with sieve segments populated, or the hollow body is completely unperforated Sheath formed with a sieve in the lower region of the hollow body.
  • the main advantage of the invention is that, if at all, only small screen areas cleaned before changing color or grade or must be replaced. Remains of granules adhering to smooth walls are easy with the help of washing nozzles or by flooding the washable in the entire process room, whereas they are in sieve holes wedge. In addition, the elimination, at least in part, is reduced of an outer casing enclosing the process space the costs.
  • the shaft (5) of the rotor (1) is a centrifugal dehumidifier in a bearing housing (2) rotatably and over a pulley (3) from a, shown in Figure 2, motor (4) in Rotation can be set.
  • the rotor (1) consists of one, the bearing housing (2) enclosing pot (6), on which several holders (7) for the lower Conveyor blades (8) are mounted, and an intermediate disc (9) and an upper disc (10) for. Fastening the middle and top Holder (11, 12) for the middle and upper conveyor blades (13, 14).
  • the pot (6) of the rotor (1) is coaxial with fixed sieve segments (15) and a filling shaft (16) enclosed on a cubic Outer housing (17) are attached, with at least one removable or a hinged plate (18) for screen installation, a drain pipe (19) and an air blow-off pipe (20) is provided.
  • the top one Area of the rotor (1) encloses a flange-mounted on the outer housing (17), Unperforated jacket, flared in the shape of a truncated cone (21) with a granulate discharge nozzle (22) which is supported by a cover (23) with an air intake grate (24), a filter mat (25) and a support grille (26) is closed.
  • FIG. 3 shows a centrifugal dehumidifier, the one with conveyor blades (27) equipped rotor (28) designed as a closed hollow body is completely enclosed by an unperforated jacket (29), one has a cylindrical / conical shape.
  • the one with the rotor (28) coupled motor (30) is flanged onto the cover (31).
  • the lid (31) contains air intake openings (32).
  • the lower shaft (35) of the rotor (28) is rotatably mounted in a bearing housing (34), which is located in the base (33).
  • a tangential granulate discharge nozzle (36), in the lower area a filling shaft (37) and a downcomer (38) is arranged.
  • the downcomer (38) enters Air blow-off pipe (39) and has a vertical pipe (40) which in the Flow tank (41) with siphon (42) is immersed. Between the unpunched A screen (43) can be attached to the jacket (29) and the downcomer (38) become.
  • the filling shaft (16) is continuously loaded with suspension.
  • the liquid is in the lower area against the sieve segments (15) the outer housing (17) flung.
  • the unperforated jacket (21) flows down the inside of the wall until it Flows through sieve segments (15). All of the liquid leaves the Centrifugal dehumidifier through the drain port (19).
  • Through the lid (23) Air sucked in is partly with the granules, partly through blown off the air blow-off pipe (20).
  • a suction fan can be connected to the air blow-off pipe (20).
  • centrifugal dehumidifier differs differ from that of Figures 1 and 2 in that the rotor is completely enclosed by an unperforated jacket (29), so that all the liquid flows down the inside wall and if available, the relatively small sieve (43) in front of the downcomer (38) happens.
  • the vertical tube (40) the drain shaft into the liquid level of the flow container (41) with siphon (42). This arrangement is provided in the event that a suction fan is connected to the air blow-off pipe (39).
  • the area of the small sieve (43) is particularly sufficient if the liquid content of the supplied suspension is low.
  • the drain shaft (38) of a central dehumidifier 3 can be designed in such a way that the screen (43) with is interchangeable in a few simple steps. It is also possible to be complete to dispense with the sieve (43) and the draining liquid in the some granules may be contained in an upstream thickener to recirculate. Suspensions from liquids and granules are easy to thicken, the screens of static thickeners hardly incline for clogging, easy to clean and more accessible, than the screens of centrifugal dehumidifiers that only take safety measures may be opened.
  • the unperforated jacket (21, 29) can also be cylindrical throughout.
  • the liquid flows on the inner wall of a cylinder slower than in an extended one Cone, but ultimately the cost decides which form of the jacket and the rotor (1, 28) is more appropriate.

Description

Die Erfindung betrifft eine Vorrichtung für einen Fliehkraft-Entfeuchter zur Trennung und Entfeuchtung von Granulaten.The invention relates to a device for a centrifugal dehumidifier for the separation and dehumidification of granules.

Fliehkraft-Entfeuchter werden beispielsweise zur Entfeuchtung von Kunststoff-Granulat eingesetzt. Dabei ist eine leichte Reinigbarkeit der Verfahrensräume wichtig, weil beim Wechsel der Granulatfarbe oder Sorte die Vermischung von Granulaten oder Bruchstücken der vorhergehenden mit der neuen Charge vermieden werden muß. Weiterhin sind lange Standzeiten der Apparateteile, geringer Abrieb der zu entfeuchtenden Granulate und geringe Schallemissionen wichtig.Centrifugal dehumidifiers are used, for example, to dehumidify Plastic granules used. It is easy to clean Process rooms important because when changing the granulate color or Sort the mix of granules or fragments of the previous one must be avoided with the new batch. Furthermore are long service life of the device parts, low abrasion of the parts to be dehumidified Granules and low noise emissions are important.

Bekannte Fliehkraft-Entfeuchter nach den deutschen Offenlegungsschriften DE 195 37 41 A1, DE 43 30 078 A1 sowie DE 28 19 443 A1 und nach dem US-Patent 5,611,150 bestehen aus einem Gehäuse, in dem ein Hohlkörper aus Sieben einen mit Förderschaufeln bestückten, drehbar gelagerten, vertikal angeordneten Rotor koaxial umschließt. Die Siebe bilden entweder einen geschlossenen Zylinder oder sind segmentiert. Sie erstrecken sich vom Boden bis zu der, am oberen Ende befindlichen, Granulat-Abwurfzone und werden nur von Befestigungselementen sowie ggf. von einem Einfüllschacht unterbrochen. Known centrifugal dehumidifiers according to the German published documents DE 195 37 41 A1, DE 43 30 078 A1 and DE 28 19 443 A1 and according to US patent 5,611,150 consist of a housing in which a Hollow body made of seven, rotatable with conveyor blades mounted, vertically arranged rotor coaxially encloses. The sieves either form a closed cylinder or are segmented. she extend from the floor to the one at the top, Granules drop zone and are only used by fasteners as well possibly interrupted by a feed chute.

Die Suspension aus Granulaten und Flüssigkeit wird dem unteren Bereich der Fliehkraft-Entfeuchter kontinuierlich zugeführt, und zwar in den Raum zwischen dem Rotor und dem aus Sieben gebildeten Hohlkörper. Sie wird von den mitrotierenden Förderschaufeln des Rotors erfaßt, welche sowohl einen nach oben gerichteten Transportimpuls als auch Zentrifulgalkräfte auf die Suspension übertragen. Dabei werden die Granulate sowohl nach oben transportiert, als auch zwischen den Sieben und den Förderschaufeln hin- und hergeworfen, während die von den Granulaten getrennte Flüssigkeit die Siebe passiert und durch den Ablaufstutzen des, den Fliehkraft-Entfeuchter aufnehmenden, Gehäuses abgeleitet wird.The suspension of granules and liquid becomes the lower area the centrifugal dehumidifier continuously fed, in the Space between the rotor and the hollow body formed from sieves. It is gripped by the rotating blades of the rotor, which is both an upward transport pulse and Transfer centrifugal forces to the suspension. The Granules both transported upwards and between the sieves and tossing the shovels back and forth while those of the Granules separate liquid through the sieves and through the drain nozzle of the housing that houses the centrifugal dehumidifier is derived.

Weiterhin wird von oben Luft in den Verfahrensraum gesaugt, von der ein Teil mit den entfeuchteten Granulaten austritt, während der andere Teil im Gegenstrom zu den Granulaten aus einem tiefer liegenden Bereich der Fliehkraft-Entfeuchter abgeblasen oder abgesaugt wird. Dieser Luft-Gegenstrom verhindert die Rückbefeuchtung von Granulaten mit Flüssigkeitströpfchen, die beim Aufprall der Granulate gebildet worden sind.Furthermore, air is sucked into the process chamber from above, from the one part with the dehumidified granules emerges while the other Part in counterflow to the granules from a lower lying area the centrifugal dehumidifier is blown off or extracted. This Air counterflow prevents the rewetting of granules Liquid droplets that were formed on impact of the granules are.

Derartige Fliehkraft-Entfeuchter haben sich prinzipiell bewährt. Nachteilig ist die Kontamination der Siebe mit Bruchstücken der Granulate, so daß diese Siebe vor jedem Farb- oder Sortenwechsel demontiert, gereinigt oder ausgetauscht werden müssen. Außerdem verschleißen Siebe relativ stark, werden bei ihrem häufigen Wechsel leicht beschädigt und erzeugen Abrieb an den zu entfeuchtenden Granulaten. Für die Entfeuchtung von stark schleißenden Granulaten, wie zum Beispiel mit Glasfasern gefüllten Kunststoffgranulaten, sind sie deshalb ungeeignet. Weiterhin ist der vom Aufprall der Granulate auf die Siebe emittierte Schall erheblich. Centrifugal dehumidifiers of this type have proven themselves in principle. adversely is the contamination of the sieves with fragments of the granules, so that these screens are disassembled and cleaned before every color or type change or need to be replaced. Sieves also wear out relatively strong, are easily damaged when they are changed frequently generate abrasion on the granules to be dehumidified. For dehumidification of highly abrasive granules, such as with glass fibers filled plastic granules, they are therefore unsuitable. Still is the sound emitted by the impact of the granules on the sieves is considerable.

Zwar lassen sich die Außengehäuse derartiger Zentrifugal-Entfeuchter gegen zu starke Schallemissionen isolieren, aber diese Isolierung ist aufwendig, weil die Zugänglichkeit der Siebe verschließbare Öffnungen, wie Klapptüren usw., an den Gehäusen erfordert.The outer casing of such centrifugal dehumidifiers can be used isolate against excessive sound emissions, but this insulation is complex, because the accessibility of the sieves can be closed, such as folding doors, etc., on the housings.

Die Erfindung stellt sich die Aufgabe, einen Fliehkraft-Entfeuchter zu schaffen, der den Abrieb der Granulate reduziert.The invention has for its object to a centrifugal dehumidifier create that reduces the abrasion of the granules.

Zur Lösung dieser Aufgabe ist ein wesentlicher Teil, vorzugsweise zumindest im oberen Bereich des Hohlkörpers, als ungelochter Mantel ausgebildet. Die von den Granulaten getrennte Flüssigkeit fließt unter Einwirkung der Zentrifugal- und der Erdbeschleunigung an der Innenwand des ungelochten Mantels spiralförmig nach unten. Der ungelochte Mantel mit seinen glatten Innenflächen verursacht wenig Abrieb.To solve this problem, an essential part is preferred at least in the upper area of the hollow body, as an unperforated jacket educated. The liquid separated from the granules flows in Influence of centrifugal and gravitational acceleration on the inner wall of the unpunched jacket spiral down. The unperforated Coat with its smooth inner surfaces causes little wear.

Je nach Wanddicke verursacht der ungelochte Mantel wenig Schall, so daß der Hohlkörper dort, wo er als ungelochter Mantel ausgebildet ist, gleichzeitig als Außengehäuse dienen kann.Depending on the wall thickness, the unperforated cladding causes little sound, so that the hollow body where it is designed as an unperforated jacket, can also serve as an outer housing.

Vorzugsweise ist allenfalls der untere Bereich des Hohlkörpers mit Siebsegmenten bestückt, oder der Hohlkörper ist vollständig als ungelochter Mantel mit einem Sieb im unteren Bereich des Hohlkörpers ausgebildet.The lower region of the hollow body is preferably with sieve segments populated, or the hollow body is completely unperforated Sheath formed with a sieve in the lower region of the hollow body.

Der Hauptvorteil der Erfindung besteht darin, daß, wenn überhaupt, nur noch kleine Siebflächen vor einem Farb- oder Sortenwechsel gereinigt bzw. ausgetauscht werden müssen. An glatten Wänden haftende Granulatreste sind leicht mit Hilfe von Waschdüsen oder durch Fluten des gesamten Verfahrensraumes abspülbar, wogegen sie sich in Sieblöchern verkeilen. Darüber hinaus reduziert der, zumindest teilweise, Wegfall eines den Verfahrensraum umschließenden Außengehäuses die Kosten.The main advantage of the invention is that, if at all, only small screen areas cleaned before changing color or grade or must be replaced. Remains of granules adhering to smooth walls are easy with the help of washing nozzles or by flooding the washable in the entire process room, whereas they are in sieve holes wedge. In addition, the elimination, at least in part, is reduced of an outer casing enclosing the process space the costs.

In den Abbildungen sind zwei Ausführungsbeispiele dargestellt.

Figur 1
zeigt einen Teil-Längsschnitt durch einen Fliehkraft-Entfeuchter, dessen Rotor nur im unteren Bereich von einem Siebmantel mit Außengehäuse umschlossen ist.
Figur 2
zeigt eine Draufsicht auf den Fliehkraft-Entfeuchter nach Figur 1.
Figur 3
zeigt einen Teil-Längsschnitt durch einen Fliehkraft-Entfeuchter, dessen den Rotor umschließender Hohlkörper vollständig als ungelochter Mantel ausgebildet ist.
Two exemplary embodiments are shown in the figures.
Figure 1
shows a partial longitudinal section through a centrifugal dehumidifier, the rotor of which is enclosed only in the lower area by a screen jacket with an outer housing.
Figure 2
shows a top view of the centrifugal dehumidifier according to FIG. 1.
Figure 3
shows a partial longitudinal section through a centrifugal dehumidifier, the hollow body surrounding the rotor is completely formed as an unperforated jacket.

Nach den Figuren 1 und 2 ist die Welle (5) des Rotors (1) eines Fliehkraft-Entfeuchters in einem Lagergehäuse (2) drehbar gelagert und über eine Riemenscheibe (3) von einem, in Figur 2 dargestellten, Motor (4) in Rotation versetzbar. Der Rotor (1) besteht aus einem, das Lagergehäuse (2) umschließenden Topf (6), an dem mehrere Halter (7) für die unteren Förderschaufeln (8) montiert sind, sowie einer Zwischenscheibe (9) und einer oberen Scheibe (10) zur. Befestigung der mittleren und oberen Halter (11, 12) für die mittleren und oberen Förderschaufeln (13, 14).According to Figures 1 and 2, the shaft (5) of the rotor (1) is a centrifugal dehumidifier in a bearing housing (2) rotatably and over a pulley (3) from a, shown in Figure 2, motor (4) in Rotation can be set. The rotor (1) consists of one, the bearing housing (2) enclosing pot (6), on which several holders (7) for the lower Conveyor blades (8) are mounted, and an intermediate disc (9) and an upper disc (10) for. Fastening the middle and top Holder (11, 12) for the middle and upper conveyor blades (13, 14).

Der Topf (6) des Rotors (1) wird koaxial von feststehenden Siebsegmenten (15) und einem Füllschacht (16) umschlossen, die an einem kubischen Außengehäuse (17) befestigt sind, das mit wenigstens einer abnehmbaren oder aufklappbaren Platte (18) zur Siebmontage, einem Ablaufstutzen (19) und einem Luft-Abblasrohr (20) versehen ist. Den oberen Bereich des Rotors (1) umschließt ein auf das Außengehäuse (17) geflanschter, nach unten kegelstumpfförmig erweiterter, ungelochter Mantel (21) mit einem Granulat-Austragsstutzen (22), der von einem Deckel (23) mit einem Luft-Ansaugrost (24), einer Filtermatte (25) und einem Stützgitter (26) geschlossen wird.The pot (6) of the rotor (1) is coaxial with fixed sieve segments (15) and a filling shaft (16) enclosed on a cubic Outer housing (17) are attached, with at least one removable or a hinged plate (18) for screen installation, a drain pipe (19) and an air blow-off pipe (20) is provided. The top one Area of the rotor (1) encloses a flange-mounted on the outer housing (17), Unperforated jacket, flared in the shape of a truncated cone (21) with a granulate discharge nozzle (22) which is supported by a cover (23) with an air intake grate (24), a filter mat (25) and a support grille (26) is closed.

Figur 3 zeigt einen Zentrifugal-Entfeuchter, dessen mit Förderschaufeln (27) bestückter, als geschlossener Hohlkörper ausgebildeter Rotor (28) vollständig von einem ungelochten Mantel (29) umschlossen ist, der eine zylindrisch/konische Form aufweist. Der direkt mit dem Rotor (28) gekuppelte Motor (30) ist auf den Deckel (31) geflanscht. Der Deckel (31) enthält Luft-Ansaugöffnungen (32). Die untere Welle (35) des Rotors (28) ist in einem Lagergehäuse (34) drehbar gelagert, welches sich im Sockel (33) befindet.FIG. 3 shows a centrifugal dehumidifier, the one with conveyor blades (27) equipped rotor (28) designed as a closed hollow body is completely enclosed by an unperforated jacket (29), one has a cylindrical / conical shape. The one with the rotor (28) coupled motor (30) is flanged onto the cover (31). The lid (31) contains air intake openings (32). The lower shaft (35) of the rotor (28) is rotatably mounted in a bearing housing (34), which is located in the base (33).

Am oberen Ende des ungelochten Mantels (29) ist ein tangentialer Granulat-Austragsstutzen (36), im unteren Bereich ein Füllschacht (37) und ein Ablaufschacht (38) angeordnet. Der Ablaufschacht (38) trägt ein Luft-Abblasrohr (39) und weist ein senkrechtes Rohr (40) auf, das in den Durchlaufbehälter (41) mit Siphon (42) taucht. Zwischen dem ungelochten Mantel (29) und dem Ablaufschacht (38) kann ein Sieb (43) angebracht werden.At the upper end of the unperforated jacket (29) is a tangential granulate discharge nozzle (36), in the lower area a filling shaft (37) and a downcomer (38) is arranged. The downcomer (38) enters Air blow-off pipe (39) and has a vertical pipe (40) which in the Flow tank (41) with siphon (42) is immersed. Between the unpunched A screen (43) can be attached to the jacket (29) and the downcomer (38) become.

Fliehkraft-Entfeuchter nach den Figuren 1 und 2 arbeiten folgendermaßen:Centrifugal dehumidifiers according to Figures 1 and 2 work as follows:

Der Füllschacht (16) wird kontinuierlich mit Suspension beschickt. Die, in Drehrichtung zurückweichenden, schräg nach oben angestellten Förderschaufeln (8, 13, 14) beschleunigen die Granulate und werfen sie zwischen sich und der umgebenden Wand sowohl nach oben als auch hin und her, bis sie aus dem Granulat-Austragsstutzen (22) abgeworfen werden.The filling shaft (16) is continuously loaded with suspension. The, in the direction of rotation receding, inclined upward conveyor blades (8, 13, 14) accelerate the granules and throw them between itself and the surrounding wall both upwards and outwards and forth until they are thrown out of the granulate discharge nozzle (22) become.

Die Flüssigkeit wird im unteren Bereich gegen die Siebsegmente (15) in das Außengehäuse (17) geschleudert. Im ungelochten Mantel (21) fließt sie an dessen Innenwand spiralförmig nach unten, bis sie ebenfalls die Siebsegmente (15) durchströmt. Die gesamte Flüssigkeit verläßt den Fliehkraft-Entfeuchter durch den Ablaufstutzen (19). Durch den Deckel (23) angesaugte Luft wird teilweise mit den Granulaten, teilweise durch das Luft-Abblasrohr (20) abgeblasen. Zur Verstärkung des Luftstromes kann ein Saugventilator an das Luft-Abblasrohr (20) angeschlossen werden.The liquid is in the lower area against the sieve segments (15) the outer housing (17) flung. In the unperforated jacket (21) flows down the inside of the wall until it Flows through sieve segments (15). All of the liquid leaves the Centrifugal dehumidifier through the drain port (19). Through the lid (23) Air sucked in is partly with the granules, partly through blown off the air blow-off pipe (20). To increase the air flow a suction fan can be connected to the air blow-off pipe (20).

Die Arbeitsweise des Zentrifugal-Entfeuchters nach Figur 3 unterscheidet sich insofern von derjenigen nach den Figuren 1 und 2, als der Rotor vollständig von einem ungelochten Mantel (29) umschlossen wird, so daß die gesamte Flüssigkeit an dessen Innenwand nach unten fließt und, wenn vorhanden, das relativ kleine Sieb (43) vor dem Ablaufschacht (38) passiert. Nach dem Ausführungsbeispiel taucht das senkrechte Rohr (40) des Ablaufschachts in den Flüssigkeitsspiegel des Durchlaufbehälters (41) mit Siphon (42) ein. Diese Anordnung ist für den Fall vorgesehen, daß an das Luft-Abblasrohr (39) ein Saugventilator angeschlossen wird.The operation of the centrifugal dehumidifier according to Figure 3 differs differ from that of Figures 1 and 2 in that the rotor is completely enclosed by an unperforated jacket (29), so that all the liquid flows down the inside wall and if available, the relatively small sieve (43) in front of the downcomer (38) happens. According to the exemplary embodiment, the vertical tube (40) the drain shaft into the liquid level of the flow container (41) with siphon (42). This arrangement is provided in the event that a suction fan is connected to the air blow-off pipe (39).

Die Fläche des kleinen Siebes (43) reicht insbesondere dann aus, wenn der Flüssigkeitsanteil der zugeführten Suspension gering ist.The area of the small sieve (43) is particularly sufficient if the liquid content of the supplied suspension is low.

Die Erfindung ist nicht auf die Ausführungsbeispiele beschränkt. Beispielsweise kann der Ablaufschacht (38) eines Zentrlfugal-Entfeuchters nach Figur 3 derart aufklappbar gestaltet werden, daß das Sieb (43) mit wenigen Handgriffen austauschbar ist. Es ist auch möglich, vollständig auf das Sieb (43) zu verzichten und die ablaufende Flüssigkeit, in der einige Granulate enthalten sein können, in einen vorgeschalteten Eindicker zu rezirkulieren. Suspensionen aus Flüssigkeiten und Granulaten sind leicht eindickbar, die Siebe von statischen Eindickern neigen kaum zum Verstopfen, lassen sich leicht reinigen und sind besser zugänglich, als die Siebe von Zentrifugal-Entfeuchtern, die nur unter Sicherheitsmaßnahmen geöffnet werden dürfen.The invention is not restricted to the exemplary embodiments. For example the drain shaft (38) of a central dehumidifier 3 can be designed in such a way that the screen (43) with is interchangeable in a few simple steps. It is also possible to be complete to dispense with the sieve (43) and the draining liquid in the some granules may be contained in an upstream thickener to recirculate. Suspensions from liquids and granules are easy to thicken, the screens of static thickeners hardly incline for clogging, easy to clean and more accessible, than the screens of centrifugal dehumidifiers that only take safety measures may be opened.

Wie Versuche gezeigt haben, kann der ungelochte Mantel (21, 29) auch durchgehend zylindrisch sein. Zwar fließt die Flüssigkeit an der Innenwand eines Zylinders langsamer ab als in einem nach unten erweiterten Konus, aber letztlich entscheiden die Kosten, welche Fom des Mantels und des Rotors (1, 28) zweckmäßiger ist. Selbst wenn ein rein zylindrischer Mantel zur Erzielung gleicher Trennergebnisse etwas länger sein oder einen größeren Durchmesser haben muß, als ein Mantel mit einem kegelstumpfförmigen Bereich, kann seine Herstellung kostengünstiger sein.As experiments have shown, the unperforated jacket (21, 29) can also be cylindrical throughout. The liquid flows on the inner wall of a cylinder slower than in an extended one Cone, but ultimately the cost decides which form of the jacket and the rotor (1, 28) is more appropriate. Even if it's a purely cylindrical one Coat a little longer to achieve the same separation results or must have a larger diameter than a jacket with a frustoconical area, its manufacture can be more cost-effective his.

Claims (12)

  1. A centrifugal dryer for pellets having a vertically disposed rotor (1; 28) equipped with conveyor blades (8, 13, 14; 27), a hollow body (15, 21; 29) coaxially enclosing the rotor, a pellet discharge port (22; 36) disposed at the upper end of the hollow body, and a discharge (19; 38) for centrifuged liquid at the lower end of the hollow body, a suspension of pellets and liquid being supplied into the space between the rotor and the hollow body and being accelerated by means of the rotor and hurled against the inside wall of the hollow body, its liquid content draining on the inside wall of the hollow body, wherein a substantial part of the hollow body located in the centrifugal area of the rotor is formed as an unperforated jacket (21; 29).
  2. A centrifugal dryer according to claim 1, characterized in that at least an upper area of the hollow body is formed as an unperforated jacket (21; 29).
  3. A centrifugal dryer according to claim 1 or 2, characterized in that at most the lower area of the hollow body (15, 21) enclosing the rotor (21) is equipped with screen segments (15) disposed in an outside housing (17) for removing the liquid separated from the pellets.
  4. A centrifugal dryer according to claim 1 or 2, characterized in that the hollow body (29) enclosing the rotor (28) is formed completely as an unperforated jacket with a screen (43) in the lower area of the hollow body for removing the liquid separated from the pellets.
  5. A centrifugal dryer according to claim 4, characterized that the hollow body (29) is formed with openings for a feed chute (37), a pellet discharge port (36) and a downcomer (38) behind the screen (43) for the liquid.
  6. A centrifugal dryer according to claim 5, characterized in that the downcomer (38) is adapted to swing out.
  7. A centrifugal dryer according to claim 5 or 6, characterized in that a vertical pipe (40) of the downcomer (38) dips into a continuous-flow vessel (41) with a siphon (42) and a suction fan is connected to an air blow-off pipe (39) mounted on the downcomer (38).
  8. A centrifugal dryer according to any of claims 1 to 7, characterized in that the discharge of the centrifugal dryer leads to a thickener.
  9. A centrifugal dryer according to any of claims 1 to 8, characterized in that the unperforated jacket (21; 29) is cylindrical.
  10. A centrifugal dryer according to any of claims 1 to 9, characterized in that the unperforated jacket (21; 29) is frustoconical.
  11. A centrifugal dryer according to any of claims 1 to 10, characterized in that the upper area of the unperforated jacket (21; 29), flaring downward in a frustoconical shape, is cylindrical therebelow.
  12. A centrifugal dryer according to any of claims 1 to 11, characterized in that the area of the hollow body formed as an unperforated jacket forms a part of the outside housing of the centrifugal dryer.
EP00901054A 1999-01-04 2000-01-03 Centrifugal dehydrator Expired - Lifetime EP1141643B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19900042 1999-01-04
DE19900042A DE19900042A1 (en) 1999-01-04 1999-01-04 Centrifugal dehumidifier
PCT/EP2000/000006 WO2000040911A1 (en) 1999-01-04 2000-01-03 Centrifugal dehydrator

Publications (2)

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EP1141643A1 EP1141643A1 (en) 2001-10-10
EP1141643B1 true EP1141643B1 (en) 2003-04-16

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EP00901054A Expired - Lifetime EP1141643B1 (en) 1999-01-04 2000-01-03 Centrifugal dehydrator

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US (1) US6655039B2 (en)
EP (1) EP1141643B1 (en)
DE (2) DE19900042A1 (en)
WO (1) WO2000040911A1 (en)

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Also Published As

Publication number Publication date
US20020014019A1 (en) 2002-02-07
DE50001785D1 (en) 2003-05-22
US6655039B2 (en) 2003-12-02
DE19900042A1 (en) 2000-07-06
EP1141643A1 (en) 2001-10-10
WO2000040911A1 (en) 2000-07-13

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