WO1990015667A1 - Centrifugal separator - Google Patents
Centrifugal separator Download PDFInfo
- 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
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)
Abstract
Centrifugal separator with a rotor (1), which is arranged in a gas containing chamber (4) and on its outside is provided with a number of cavities, which are located at a distance from each other and open to the chamber (4). In order to disturb the generation of sound waves in the cavities (5) of the resonance frequency of the cavities, an irregularity (6), preferably in the shape of a projection, is arranged nearby and in front of a cavity (5) seen in the rotational direction of the rotor.
Description
Centrifugal separator
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. In particular this is the case in centrifugal separators, the rotors of which during operation rotates at a relatively high number of revolutions.
In WO 86/06006 a centrifugal separator is disclosed, 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.
In order to achieve a reduction of the sound level of the sound generated by a rotor of the kind initially described, there is suggested according to the present invention that 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.
Hereby, the gas flow at the opening of the cavity is disturbed in a way such that the sound level of the tone of the resonance frequency, which the gas flow generates in the cavity is reduced considerably or completely eliminated.
The irregularity is preferably equally distributed around the rotor. Suitably, the outside of the rotor has one irregularity in front of each cavity.
In a preferred embodiment of the invention 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. In this embodiment it is beneficial if 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.
In an alternative embodiment the irregularity consists of a recess, which is arranged on the outside of the rotor in front of the cavities.
In the following, the invention will be described with reference to the accompanying drawings, in which
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, and
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. Preferably, 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.
In figure 2 there is shown schematically an axial section through a rotor of a centrifugal separator, which is designed in accordance with the present invention. As the embodiment shown in figure 1, 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. On the outside of the rotor near by and in front of each opening 5, seen in the rotational direction, a projection 6 is arranged in the shape of a fin as in the embodiment shown in figure 1.
In 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. In this figure, the said connection 7 is schematically marked.
By designing a" centrifugal separator in the described manner, the flow pattern at the front edge of the cavities is disturbed for the gas present in the chamber 4, which is passed by the cavities 5-
Claims
1. Centrifugal separator with a rotor (1), which is arranged in a gas containing space (4) and on its outside is provided with a number of cavities (5), which are located at a distance from each other in the rotational direction of the rotor and open to the chamber (4) during operation of the rotor, c h a r a c t e r i z e d i n that the outside of the rotor has at least one irregularity (6) disturbing the generation of a tone near by and in front of a cavityj seen in the rotational direction of the rotor, the irregularity (6) being so desi~ ιed that the creation of wave movements in the cavities (5) of the resonance frequency of the cavities is disturbed.
2. Centrifugal separator according to claim 1, c h a r a c ¬ t e r i z e d i n that the cavit'.es (5) are equally distri¬ buted around the rotor.
3. Centrifugal separator according to claim 1 or 2 c h a - r a c t e r i z e d i n that the outside of the rotor has one irregularity (6) in front of each cavity.
4. Centrifugal separator according to any of the preceding claims, c h a r a c t e r i z e d i n that said irregula- rity consists of a projection (6) projecting radially outwards from the outside of the rotor.
5. Centrifugal separator according to claim 4j c h a r a c ¬ t e r i z e d i n that said projection consists of a fin, the longitudinal direction of which coincides with the rotational direction of the rotor.
6. Centrifugal separator according to claim 4 or 5, c h ¬ r a c t e r i z e d i n that said projection extends in the rotational direction from one cavity to an adjacent cavity.
7. Centrifugal separator according to claim 1, 2 or 3, c h a r a c t e r i z e d i n that said irregularity consists of a recess.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1990601475 DE69001475T2 (en) | 1989-06-13 | 1990-05-31 | CENTRIFUGAL SEPARATOR. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8902127A SE463903B (en) | 1989-06-13 | 1989-06-13 | Centrifugal separator with tone-forming noise |
SE8902127-3 | 1989-06-13 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1990015667A1 true WO1990015667A1 (en) | 1990-12-27 |
Family
ID=20376269
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE1990/000374 WO1990015667A1 (en) | 1989-06-13 | 1990-05-31 | Centrifugal separator |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0428705B1 (en) |
JP (1) | JPH04500333A (en) |
ES (1) | ES2041179T3 (en) |
SE (1) | SE463903B (en) |
WO (1) | WO1990015667A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE517760C2 (en) * | 2000-11-14 | 2002-07-09 | Alfa Laval Ab | Centrifugal separator and centrifuge rotor |
Citations (5)
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 (en) * | 1985-04-11 | 1986-10-23 | Alfa-Laval Separation Ab | Centrifugal separator comprising a rotor, which around its circumference has outlets for intermittently discharging a separated product and outlet for discharging an operating liquid |
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 |
-
1989
- 1989-06-13 SE SE8902127A patent/SE463903B/en not_active IP Right Cessation
-
1990
- 1990-05-31 EP EP19900909818 patent/EP0428705B1/en not_active Expired - Lifetime
- 1990-05-31 WO PCT/SE1990/000374 patent/WO1990015667A1/en active IP Right Grant
- 1990-05-31 JP JP50907090A patent/JPH04500333A/en active Pending
- 1990-05-31 ES ES90909818T patent/ES2041179T3/en not_active Expired - Lifetime
Patent Citations (5)
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 (en) * | 1985-04-11 | 1986-10-23 | Alfa-Laval Separation Ab | Centrifugal separator comprising a rotor, which around its circumference has outlets for intermittently discharging a separated product and outlet for discharging an operating liquid |
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 |
---|---|
SE8902127D0 (en) | 1989-06-13 |
EP0428705A1 (en) | 1991-05-29 |
SE8902127L (en) | 1990-12-14 |
EP0428705B1 (en) | 1993-04-28 |
JPH04500333A (en) | 1992-01-23 |
ES2041179T3 (en) | 1993-11-01 |
SE463903B (en) | 1991-02-11 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US5202024A (en) | Centrifugal separator | |
US5165849A (en) | Centrifugal compressor | |
KR100467331B1 (en) | Fan and fan-shroud assembly | |
KR101650977B1 (en) | Turbine wheel with untuned blades comprising a damping device | |
KR100373082B1 (en) | Drain pump | |
CN102454620B (en) | Air supply fan | |
JP4554189B2 (en) | Centrifugal impeller | |
JP2002061596A (en) | Centrifugal fan with water-proof structure | |
CN107762985B (en) | Centrifugal compressor | |
WO1993014320A1 (en) | Noise cancellation device for centrifugal blower | |
SE9800474D0 (en) | Rotating filter | |
CA2688779A1 (en) | Boundary layer wind turbine with tangential rotor blades | |
US6394747B1 (en) | Molecular drag vacuum pumps | |
KR20190065911A (en) | Dual impeller | |
JP4231551B2 (en) | Centrifuge rotor | |
EP0428705B1 (en) | Centrifugal separator | |
JP2005533958A (en) | Screw compressor discharge port design | |
CN100591922C (en) | Radiating mould assembly with double fan | |
CN208793265U (en) | Kit for radial ventilation machine | |
SE517760C2 (en) | Centrifugal separator and centrifuge rotor | |
JP2005140095A (en) | Centrifugal fan | |
JP2021050699A (en) | Centrifugal compressor | |
JP3810672B2 (en) | Impeller of vortex blower and manufacturing method thereof | |
CN216950977U (en) | Impeller and electric appliance | |
JPS6124643Y2 (en) |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 1990909818 Country of ref document: EP |
|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): JP US |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): AT BE CH DE DK ES FR GB IT LU NL SE |
|
WWP | Wipo information: published in national office |
Ref document number: 1990909818 Country of ref document: EP |
|
WWG | Wipo information: grant in national office |
Ref document number: 1990909818 Country of ref document: EP |