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EP0428705B1 - Separateur centrifuge - Google Patents

Separateur centrifuge Download PDF

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Publication number
EP0428705B1
EP0428705B1 EP19900909818 EP90909818A EP0428705B1 EP 0428705 B1 EP0428705 B1 EP 0428705B1 EP 19900909818 EP19900909818 EP 19900909818 EP 90909818 A EP90909818 A EP 90909818A EP 0428705 B1 EP0428705 B1 EP 0428705B1
Authority
EP
European Patent Office
Prior art keywords
rotor
centrifugal separator
cavities
irregularity
outside
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
EP19900909818
Other languages
German (de)
English (en)
Other versions
EP0428705A1 (fr
Inventor
Per-Olof Andersson
Bengt Lahti
Otto Hellekant
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.)
Alfa Laval Separation AB
Original Assignee
Alfa Laval Separation AB
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 Alfa Laval Separation AB filed Critical Alfa Laval Separation AB
Publication of EP0428705A1 publication Critical patent/EP0428705A1/fr
Application granted granted Critical
Publication of EP0428705B1 publication Critical patent/EP0428705B1/fr
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
    • B04B7/00—Elements of centrifuges
    • B04B7/08—Rotary bowls

Definitions

  • the present invention relates to centrifugal separators having rotors arranged rotatably in a gas containing space or chamber and on the outside are provided with a number of cavities, which cavities are open to the chamber during operation of the rotor.
  • Centrifugal separators of this kind generate a sound, which in many cases exceeds an acceptable sound level. In particular, this is the case in centrifugal separators whose rotate at a relatively high number of revolutions.
  • WO 86/06006 discloses a centrifugal separator which has a rotor of this kind. This rotor is arranged in a gas containing chamber and has a number of cavities in the form of openings on its outside, which openings are open to the chamber. It has shown to be very difficult to reduce the sound level during operation of such a centrifugal separator to an acceptable level. The sound of the centrifugal separator is generated inter alia as wave movements in the gas which is present in said openings.
  • the object of the present invention is to provide a rotor which generates substantially less sound than hitherto known rotors, even at a relatively high operational number of revolutions.
  • the solution according to the invention is based upon the understanding that the wave movements in the gas present in the cavities often are responsible for a great deal of the sound generated by the rotor and that these wave movements are generated by the gas which, during operation of the rotor, is passed by the openings of the cavities facing the chamber.
  • the outside of the rotor has at least one irregularity disturbing the generation of a tone near to and in front of the one of the cavities seen in the rotational direction of rotor.
  • the irregularities are so designed that the creation of wave movements in the cavities at the resonance frequency of the cavities is disturbed.
  • the irregularity is preferably uniformly distributed around the rotor.
  • the outside of the rotor has one irregularity in front of each cavity.
  • the irregularity consists of a projection projecting radially outwards from the outside of the rotor, preferably in the form of a fin, the longitudinal direction of which essentially coincides with the rotational direction of the rotor.
  • the projections or fins extend in the rotational direction from one cavity to an adjacent cavity. If the projections consist of fins the irregularities can easily be made during manufacture, when turning the outside of the rotor.
  • the irregularity consists of a recess or recesses, each arranged on the outside of the rotor in front of a cavity or cavities.
  • the centrifugal separator shown in figure 1 has a rotor 1 which is driven and supported by a vertical shaft 2.
  • the rotor is surrounded by a stationary casing 3, which forms a gas containing chamber 4, in which the rotor rotates.
  • a number of cavities 5 are arranged on the outside of the rotor, which are open to the chamber 4 and located at a distance from each other in the rotational direction of the rotor.
  • these cavities consist of openings, which are equally distributed around the rotor. Through these openings a component separated in the rotor is thrown out intermittently. Between these openings, projections 6 are arranged to disturb the creation of wave movements in the cavities at the resonance frequency of the cavities.
  • these projections are arranged near to and in front of each opening seen in the rotational direction of the rotor, and in the example shown, the projections 6 consists of fins extending from one opening to an adjacent opening. The longitudinal direction of these fins coincides with the rotational direction of the rotor.
  • FIG 2 there is shown schematically an axial section through a rotor of a centrifugal separator, which is designed in accordance with the present invention.
  • this rotor has a number of cavities 5 in the form of openings arranged equally distributed around the rotor on its outside. Radially inside the openings 5, the rotor has a connection 7 extending around the rotational axis of the rotor and connecting the different openings to each other.
  • a projection 6 is arranged in the form of a fin, as in the embodiment shown in figure 1.
  • figure 3 there is shown schematically a part of a radial section through the rotor shown in figure 2. This section extends through the openings 5 and the said connection 7 is schematically marked.

Landscapes

  • Centrifugal Separators (AREA)
  • Compressor (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

Abstract

L'invention concerne un séparateur centrifuge doté d'un rotor (1), lequel est agencé dans une chambre (4) contenant du gaz, et comportant sur son côté extérieur un certain nombre de cavités, lesquelles se situent à une certaine distance les unes des autres et débouchent dans ladite chambre (4). Afin de perturber l'émission d'ondes sonores dans lesdites cavités (5), de la fréquence de résonance de ces dernières, on a ménagé une irrégularité (6), ayant de préférence la forme d'une saillie, à proximité et devant une cavité (5) vue dans le sens rotatoire du rotor.

Claims (7)

  1. Séparateur centrifuge comprenant un rotor (1) monté dans un espace (4) contenant un gaz et qui est muni sur sa partie externe d'un certain nombre de cavités (5) qui sont disposées à une certaine distance les unes des autres dans la direction de la rotation du rotor et s'ouvrent dans la chambre (4) pendant le fonctionnement du rotor, caractérisé en ce que la partie externe du rotor comprend au moins une irrégularité (6) qui perturbe la génération d'un bruit à proximité de et à l'avant d'une cavité, vue dans la direction de la rotation du rotor, l'irrégularité (6) étant constituée de manière que la création de mouvements ondulatoires dans les cavités (5) à la fréquence de résonance des cavités soit perturbée.
  2. Séparateur centrifuge selon la revendication 1, caractérisé en ce que les cavités (5) sont réparties de façon régulière autour du rotor.
  3. Séparateur centrifuge selon la revendication 1 ou 2, caractérisé en ce que la partie externe du rotor comprend une irrégularité (6) à l'avant de chaque cavité.
  4. Séparateur centrifuge selon l'une quelconque des revendications précédentes, caractérisé en ce que ladite irrégularité consiste en une saillie (6) qui s'étend radialement vers l'extérieur à partir de la partie externe du rotor.
  5. Séparateur centrifuge selon la revendication 4, caractérisé en ce que ladite saillie consiste en une nervure, dont la direction longitudinale coïncide avec la direction de la rotation du rotor.
  6. Séparateur centrifuge selon la revendication 4 ou 5, caractérisé en ce que ladite saillie s'étend dans la direction de la rotation depuis une cavité jusqu'à une cavité adjacente.
  7. Séparateur centrifuge selon l'une des revendications 1, 2 ou 3, caractérisé en ce que ladite irrégularité consiste en un ou plusieurs évidements.
EP19900909818 1989-06-13 1990-05-31 Separateur centrifuge Expired - Lifetime EP0428705B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8902127 1989-06-13
SE8902127A SE463903B (sv) 1989-06-13 1989-06-13 Centrifugalseparator med tonbildningsstoerande ojaemnhet

Publications (2)

Publication Number Publication Date
EP0428705A1 EP0428705A1 (fr) 1991-05-29
EP0428705B1 true EP0428705B1 (fr) 1993-04-28

Family

ID=20376269

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900909818 Expired - Lifetime EP0428705B1 (fr) 1989-06-13 1990-05-31 Separateur centrifuge

Country Status (5)

Country Link
EP (1) EP0428705B1 (fr)
JP (1) JPH04500333A (fr)
ES (1) ES2041179T3 (fr)
SE (1) SE463903B (fr)
WO (1) WO1990015667A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE517760C2 (sv) * 2000-11-14 2002-07-09 Alfa Laval Ab Centrifugalseparator och centrifugrotor

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1926528A (en) * 1932-07-21 1933-09-12 American Radiator Co Air motor
SE305549B (fr) * 1967-09-27 1968-10-28 Bofors Ab
SE447544B (sv) * 1985-04-11 1986-11-24 Alfa Laval Separation Ab Centrifugalseparator omfattande en rotor som runt sin omkrets har utlopp for intermittent utsleppande av en separerad produkt och utlopp for utsleppande av manovervetska
DE3609212A1 (de) * 1986-03-19 1987-09-24 Standard Elektrik Lorenz Ag Axialluefter
US4820257A (en) * 1988-05-10 1989-04-11 Beckman Instruments, Inc. Rotor noise suppression

Also Published As

Publication number Publication date
ES2041179T3 (es) 1993-11-01
SE463903B (sv) 1991-02-11
SE8902127L (sv) 1990-12-14
EP0428705A1 (fr) 1991-05-29
JPH04500333A (ja) 1992-01-23
SE8902127D0 (sv) 1989-06-13
WO1990015667A1 (fr) 1990-12-27

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