EP0469944B1 - Energy recovery for a decanter centrifuge - Google Patents

Energy recovery for a decanter centrifuge Download PDF

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Publication number
EP0469944B1
EP0469944B1 EP19910401881 EP91401881A EP0469944B1 EP 0469944 B1 EP0469944 B1 EP 0469944B1 EP 19910401881 EP19910401881 EP 19910401881 EP 91401881 A EP91401881 A EP 91401881A EP 0469944 B1 EP0469944 B1 EP 0469944B1
Authority
EP
European Patent Office
Prior art keywords
main
frequency converter
electrically connected
bowl
motor
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
Application number
EP19910401881
Other languages
German (de)
French (fr)
Other versions
EP0469944A2 (en
EP0469944A3 (en
Inventor
Daniel Gay
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guinard Centrifugation
Guinard Centrifugation SA
Original Assignee
Guinard Centrifugation
Guinard Centrifugation SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Guinard Centrifugation, Guinard Centrifugation SA filed Critical Guinard Centrifugation
Publication of EP0469944A2 publication Critical patent/EP0469944A2/en
Publication of EP0469944A3 publication Critical patent/EP0469944A3/en
Application granted granted Critical
Publication of EP0469944B1 publication Critical patent/EP0469944B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B04B1/2016—Driving control or mechanisms; Arrangement of transmission gearing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B9/00—Drives specially designed for centrifuges; Arrangement or disposition of transmission gearing; Suspending or balancing rotary bowls
    • B04B9/02—Electric motor drives
    • 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
    • B04B2001/2075—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 means for recovering the energy of the outflowing liquid

Definitions

  • a centrifugal decanter comprises a conveyor screw contained in a bowl, in particular cylindroconical, with the same main axis as the screw.
  • the bowl is driven in rotation by a main electric motor at a different speed from the screw which is driven in rotation by a secondary electric motor and by a reduction gear.
  • the invention overcomes these drawbacks with a centrifugal decanter comprising main and secondary frequency converters whose outputs of alternating current circuits are electrically connected to the main and secondary motors respectively.
  • the positive terminals of the DC circuits of the two converters are electrically connected to each other, their negative terminals also being electrically connected to each other.
  • a diode is mounted between the secondary frequency converter and the main frequency converter so as to prevent the passage of direct current from the main frequency converter to the secondary frequency converter and to allow current to flow only in the opposite direction.
  • the single figure is a diagram of a centrifugal decanter according to the invention.
  • the centrifugal decanter comprises a main motor 1 driving by a belt 2 a main shaft 3 in rotation.
  • the shaft rotates the outer ring of a reduction gear 4 and thus drives a cylindrical-conical bowl 5 in rotation.
  • a secondary motor 6 drives, in the same direction as the main shaft, a secondary shaft 7 which, via the reduction gear 4, drives a screw 8 inside the cylindroconical bowl at a speed of rotation greater than that at which turns the bowl 5.
  • the output of the alternating current circuit 9a of a main frequency converter 9 is electrically connected to the main motor 1.
  • the output of the alternating current circuit 10a of a secondary frequency cover 10 is electrically connected to the secondary electric motor 6.
  • the positive and negative terminals of the direct current circuits 9c and 10c of the two frequency converters 9 and 10 are connected respectively to each other, a diode 15 being mounted between the two positive terminals so as to allow the passage of current frequency converter 10 to the frequency converter 9, but to prohibit it in the opposite direction.
  • the frequencies of the currents flowing in the circuits 9a and 10a are controlled by respective control units 11,12 via potentiometers 13,14, which makes it possible to adjust the speeds even when the machine is operating.
  • the braking energy recovered by the frequency converter 10 is transmitted via the frequency converter 9 to the motor 1, instead of having to be dissipated in resistors or the like.

Landscapes

  • Centrifugal Separators (AREA)
  • Control Of Multiple Motors (AREA)
  • Inverter Devices (AREA)
  • Rectifiers (AREA)

Description

Une décanteuse centrifuge comprend une vis convoyeuse contenue dans un bol, notamment cylindroconique, de même axe principal que la vis. Le bol est entraîné en rotation par un moteur électrique principal à une vitesse différente de la vis qui est entraînée en rotation par un moteur électrique secondaire et par un réducteur.A centrifugal decanter comprises a conveyor screw contained in a bowl, in particular cylindroconical, with the same main axis as the screw. The bowl is driven in rotation by a main electric motor at a different speed from the screw which is driven in rotation by a secondary electric motor and by a reduction gear.

Au US-2 867 378, on décrit une machine de ce genre, dans laquelle une partie de l'énergie d'entrainement, correspondant au freinage de l'arbre d'entrée du réducteur, est retournée au moteur principal. On ne peut pas faire varier la vitesse du bol. Pour faire varier la différence de vitesse entre le bol et la vis convoyeuse, il faut démonter et changer de poulie. Or il importe de pouvoir modifier la vitesse du bol, qui régit la clarification du produit à traiter, et la vitesse différentielle, qui régit l'humidité du solide extrait.In US-2,867,378, a machine of this kind is described, in which a part of the drive energy, corresponding to the braking of the input shaft of the reducer, is returned to the main motor. You cannot vary the speed of the bowl. To vary the speed difference between the bowl and the conveyor screw, it is necessary to disassemble and change the pulley. Now it is important to be able to modify the speed of the bowl, which governs the clarification of the product to be treated, and the differential speed, which governs the humidity of the extracted solid.

L'invention pallie ces inconvénients par une décanteuse centrifuge comprenant des convertisseurs de fréquence principal et secondaire dont les sorties de circuits de courant alternatif sont reliées électriquement respectivement aux moteurs principal et secondaire. Les bornes positives des circuits de courant continu des deux convertisseurs sont reliées électriquement entre elles, leurs bornes négatives étant également reliées électriquement entre elles.The invention overcomes these drawbacks with a centrifugal decanter comprising main and secondary frequency converters whose outputs of alternating current circuits are electrically connected to the main and secondary motors respectively. The positive terminals of the DC circuits of the two converters are electrically connected to each other, their negative terminals also being electrically connected to each other.

Grâce au couplage des circuits continus des convertisseurs de fréquence, on récupère l'énergie du moteur seccndaire travaillant en frein et on transmet cette énergie au moteur principal, mais grâce à la présence, des circuits de courant alternatif, qui peuvent être commandés indépendamment par des unités de commande, on peut régler les vitesses, alors même que la machine est en fonctionnement.Thanks to the coupling of the continuous circuits of the frequency converters, we recover the energy of the secondary motor working in brake and we transmit this energy to the main motor, but thanks to the presence of alternating current circuits, which can be controlled independently by control units, the speeds can be adjusted, even while the machine is in operation.

Une diode est montée entre le convertisseur de fréquence secondaire et le convertisseur de fréquence principal de manière à interdire le passage du courant continu du convertisseur de fréquence principal au convertisseur de fréquence secondaire et à ne permettre le passage du courant que dans le sens opposé.A diode is mounted between the secondary frequency converter and the main frequency converter so as to prevent the passage of direct current from the main frequency converter to the secondary frequency converter and to allow current to flow only in the opposite direction.

Au dessin annexé, donné uniquement à titre d'exemple :
   La figure unique est un schéma d'une décanteuse centrifuge suivant l'invention.In the attached drawing, given solely by way of example:
The single figure is a diagram of a centrifugal decanter according to the invention.

La décanteuse centrifuge comprend un moteur principal 1 entrainant par une courroie 2 un arbre principal 3 en rotation. L'arbre fait tourner la couronne extérieure d'un réducteur 4 et entraîne ainsi un bol 5 cylindroconique en rotation.The centrifugal decanter comprises a main motor 1 driving by a belt 2 a main shaft 3 in rotation. The shaft rotates the outer ring of a reduction gear 4 and thus drives a cylindrical-conical bowl 5 in rotation.

Un moteur secondaire 6 entraîne, dans le même sens que l'arbre principal, un arbre secondaire 7 qui, par l'intermédiaire du réducteur 4, entraîne une vis 8 à l'intérieur du bol cylindroconique à une vitesse de rotation supérieure à celle à laquelle tourne le bol 5. La sortie du circuit 9a de courant alternatif d'un convertisseur de fréquence principal 9 est reliée électriquement au moteur principal 1. La sortie du circuit 10a de courant alternatif d'un couvertisseur de fréquence secondaire 10 est reliée électriquement au moteur électrique secondaire 6. Les bornes positives et négatives des circuits 9c et 10c de courant continu des deux convertisseurs de fréquence 9 et 10 sont reliées respectivement entre elles, une diode 15 étant montée entre les deux bornes positives de manière à autoriser le passage du courant continu du convertisseur de fréquence 10 au convertisseur de fréquence 9, mais à l'interdire en sens opposé.A secondary motor 6 drives, in the same direction as the main shaft, a secondary shaft 7 which, via the reduction gear 4, drives a screw 8 inside the cylindroconical bowl at a speed of rotation greater than that at which turns the bowl 5. The output of the alternating current circuit 9a of a main frequency converter 9 is electrically connected to the main motor 1. The output of the alternating current circuit 10a of a secondary frequency cover 10 is electrically connected to the secondary electric motor 6. The positive and negative terminals of the direct current circuits 9c and 10c of the two frequency converters 9 and 10 are connected respectively to each other, a diode 15 being mounted between the two positive terminals so as to allow the passage of current frequency converter 10 to the frequency converter 9, but to prohibit it in the opposite direction.

Les fréquences des courants passant dans les circuits 9a et 10a sont commandées par des unités de commande 11,12 respectives par l'intermédiaire de potentiomètres 13,14, ce qui permet de régler les vitesses même lorsque la machine fonctionne.The frequencies of the currents flowing in the circuits 9a and 10a are controlled by respective control units 11,12 via potentiometers 13,14, which makes it possible to adjust the speeds even when the machine is operating.

En fonctionnement, l'énergie de freinage récupérée par le convertisseur de fréquence 10 est transmise par l'intermédiaire du convertisseur de fréquence 9 au moteur 1, au lieu d'avoir à être dissipée dans des résistances ou autres.In operation, the braking energy recovered by the frequency converter 10 is transmitted via the frequency converter 9 to the motor 1, instead of having to be dissipated in resistors or the like.

Claims (1)

  1. A centrifugal decanter comprising
    - a bowl (5) rotationally driven by a main electric motor (1),
    - a screw (8) rotationally driven by a secondary electric motor (6) and by a reduction unit (4) at a speed which is different from that of the bowl (5),
    characterized by
    - main and secondary frequency converters (9, 10), wherein the output (9a) of the alternating current circuit of the main frequency converter (9) is electrically connected to the main motor (1), the output (10a) of the alternating current circuit of the secondary frequency converter (10) is electrically connected to the secondary motor (6), the positive terminals (9c, 10c) of the direct current circuits of the two converters (9, 10) are electrically connected to each other and their negative terminals are electrically connected to each other, and
    - means (11, 12) for varying the frequencies of the converters (9, 10) and acting respectively on the alternating current circuit (9a, 10a) thereof
    - a diode between the secondary frequency converter (10) and the main frequency converter (9), mounted so as to prevent direct current from flowing from the main frequency converter (9) to the secondary frequency converter (10).
EP19910401881 1990-08-02 1991-07-08 Energy recovery for a decanter centrifuge Expired - Lifetime EP0469944B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9009898 1990-08-02
FR9009898A FR2665377B1 (en) 1990-08-02 1990-08-02 CENTRIFUGAL DECANTER WITH ENERGY RECOVERY.

Publications (3)

Publication Number Publication Date
EP0469944A2 EP0469944A2 (en) 1992-02-05
EP0469944A3 EP0469944A3 (en) 1992-05-06
EP0469944B1 true EP0469944B1 (en) 1995-06-07

Family

ID=9399363

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910401881 Expired - Lifetime EP0469944B1 (en) 1990-08-02 1991-07-08 Energy recovery for a decanter centrifuge

Country Status (4)

Country Link
EP (1) EP0469944B1 (en)
JP (1) JPH04229098A (en)
DE (1) DE69110210T2 (en)
FR (1) FR2665377B1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5203762A (en) * 1990-12-20 1993-04-20 Alfa-Laval Separation, Inc. Variable frequency centrifuge control
US5681256A (en) * 1994-11-10 1997-10-28 Nkk Corporation Screw decanter centrifuge having a speed-torque controller
DE19806374C1 (en) * 1998-02-17 1999-07-01 Westfalia Separator Ag Split drive for large centrifugal decanter
US6981940B2 (en) * 2003-06-23 2006-01-03 Abb Inc. Centrifuge control system with power loss ride through
US8808154B2 (en) * 2010-09-13 2014-08-19 Hiller Gmbh Drive apparatus in a scroll centrifuge having a gearbox with a housing nonrotatably connected to a drive shaft
DE102016116391B3 (en) * 2016-09-01 2018-02-01 Gea Mechanical Equipment Gmbh Method for monitoring a worm centrifuge

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL190819C (en) * 1954-09-16 Nuovo Pignone Spa Speed variator for a dobby loom.
FR2399151A1 (en) * 1971-01-05 1979-02-23 Dornier Ag ELECTRICAL DEVICE FOR DRIVING HIGH ROTATION SPEED APPLIANCES SUCH AS ULTRACENTRIFUGE GAS
FR2218142A1 (en) * 1973-02-19 1974-09-13 Robatel Slpi Asynchronous motor drive for centrifugal dryer - with frequency changer to facilitate starting and vary speed
US4141488A (en) * 1977-08-18 1979-02-27 Koninklijke Nederlandse Papierfabrieken N.W. Centrifuge
DE3313167A1 (en) * 1983-04-12 1984-10-25 Mantec Gesellschaft für Automatisierungs- und Handhabungssysteme mbH, 8510 Fürth INDUSTRIAL ROBOT WITH ELECTRIC THREE-PHASE INDIVIDUAL DRIVES
DE3641569C1 (en) * 1986-12-05 1988-03-24 Skf Textilmasch Komponenten Circuit arrangement for spinning or twisting machines

Also Published As

Publication number Publication date
DE69110210D1 (en) 1995-07-13
FR2665377B1 (en) 1993-09-03
FR2665377A1 (en) 1992-02-07
EP0469944A2 (en) 1992-02-05
EP0469944A3 (en) 1992-05-06
DE69110210T2 (en) 1995-10-26
JPH04229098A (en) 1992-08-18

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