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WO1990015667A1 - Separateur centrifuge - Google Patents

Separateur centrifuge Download PDF

Info

Publication number
WO1990015667A1
WO1990015667A1 PCT/SE1990/000374 SE9000374W WO9015667A1 WO 1990015667 A1 WO1990015667 A1 WO 1990015667A1 SE 9000374 W SE9000374 W SE 9000374W WO 9015667 A1 WO9015667 A1 WO 9015667A1
Authority
WO
WIPO (PCT)
Prior art keywords
rotor
centrifugal separator
cavities
outside
separator according
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.)
Ceased
Application number
PCT/SE1990/000374
Other languages
English (en)
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
Priority to DE1990601475 priority Critical patent/DE69001475T2/de
Publication of WO1990015667A1 publication Critical patent/WO1990015667A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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, more precisely to centrifugal separators, the rotors of which are arranged rotatably in a gas containing chamber and on the out ⁇ side are provided with a number of cavities, which cavities during operation of the rotor are open to the chamber.
  • Centrifugal separators of this kind generate a sound, which in many cases exceeds the sound level, which can be accepted.
  • the rotors of which during operation rotates at a relatively high number of revolutions.
  • 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 accomplish a rotor, which generates essential less sound than hitherto known rotors even at relatively high operational number of revolutions.
  • the solution according to the invention is based upon the under- standing 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 gene ⁇ rated by the gas, which is present in the chamber and during operation of the rotor is passed by the openings of the cavities towards the chamber.
  • the outside of the rotor has at least one irregularity disturbing the generation of a tone near by and in front of the one of the cavities seen in the rotational direction of the rotor.
  • the irregularities are so designed that the creation of wave movements in the cavities of the resonance frequency of the cavities is disturbed.
  • the irregularity is preferably equally 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 in the shape of a finj 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 easily can be made during manufacturing when turning the outside of the rotor.
  • the irregularity consists of a recess, which is arranged on the outside of the rotor in front of the cavities.
  • Fig 1 shows partly in a side view and partly in section a part of a centrifugal separator
  • Fig 2 schematically shows an axial section through a nart of a centrifugal separator according to the invention
  • Fig 3 schematically shows a part of a radial section through a centrifugal separator according to the invention.
  • the centrifugal separator shown in figure 1 has a rotor 1 , which is driven and supported by a vertical shaft 2.
  • the rotor is sur- rounded 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. In the shown embodiment 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 of the resonance frequency of the cavities.
  • these projections are arranged near by and in front of each opening seen in the rotational direction of the rotor, but in the shown example the projection 6 consists of fins extending from one opening to an adjacent opening. The longitudinal direction of these fins coincides with the rotatio ⁇ nal 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 shape of openings arranged equally distributed around the rotor on its outside. Radially inside the openings 5 the rotor has a connec- tion 7 extending around the rotational axis of the rotor and connecting the different openings to each other.
  • a projection 6 is arranged in the shape 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 is seen towards the fins 6.
  • 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.
PCT/SE1990/000374 1989-06-13 1990-05-31 Separateur centrifuge Ceased WO1990015667A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE1990601475 DE69001475T2 (de) 1989-06-13 1990-05-31 Zentrifugale abtrennvorrichtung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8902127-3 1989-06-13
SE8902127A SE463903B (sv) 1989-06-13 1989-06-13 Centrifugalseparator med tonbildningsstoerande ojaemnhet

Publications (1)

Publication Number Publication Date
WO1990015667A1 true WO1990015667A1 (fr) 1990-12-27

Family

ID=20376269

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1990/000374 Ceased WO1990015667A1 (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

Citations (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
US3477541A (en) * 1967-09-27 1969-11-11 Bofors Ab Device for reducing acoustic oscillations originating from the rotation of a prismatic member in a cylindrical casing
WO1986006006A1 (fr) * 1985-04-11 1986-10-23 Alfa-Laval Separation Ab Separateur centrifuge avec un rotor ayant a sa circonference des orifices de decharge intermittente d'un produit separe et un orifice de decharge d'un liquide de travail
US4761115A (en) * 1986-03-19 1988-08-02 Standard Elektrik Lorenz Ag Axial-flow fan
US4820257A (en) * 1988-05-10 1989-04-11 Beckman Instruments, Inc. Rotor noise suppression

Patent Citations (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
US3477541A (en) * 1967-09-27 1969-11-11 Bofors Ab Device for reducing acoustic oscillations originating from the rotation of a prismatic member in a cylindrical casing
WO1986006006A1 (fr) * 1985-04-11 1986-10-23 Alfa-Laval Separation Ab Separateur centrifuge avec un rotor ayant a sa circonference des orifices de decharge intermittente d'un produit separe et un orifice de decharge d'un liquide de travail
US4761115A (en) * 1986-03-19 1988-08-02 Standard Elektrik Lorenz Ag Axial-flow fan
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
JPH04500333A (ja) 1992-01-23
SE8902127L (sv) 1990-12-14
SE8902127D0 (sv) 1989-06-13
SE463903B (sv) 1991-02-11
EP0428705A1 (fr) 1991-05-29
EP0428705B1 (fr) 1993-04-28

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