EP1310304B1 - Schwingrotorlaborzentrifuge mit Geräuschreduzierungseinrichtung - Google Patents
Schwingrotorlaborzentrifuge mit Geräuschreduzierungseinrichtung Download PDFInfo
- Publication number
- EP1310304B1 EP1310304B1 EP02018698A EP02018698A EP1310304B1 EP 1310304 B1 EP1310304 B1 EP 1310304B1 EP 02018698 A EP02018698 A EP 02018698A EP 02018698 A EP02018698 A EP 02018698A EP 1310304 B1 EP1310304 B1 EP 1310304B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bucket
- laboratory centrifuge
- nacelle
- gondolas
- turbulence
- 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
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B5/00—Other centrifuges
- B04B5/04—Radial chamber apparatus for separating predominantly liquid mixtures, e.g. butyrometers
- B04B5/0407—Radial chamber apparatus for separating predominantly liquid mixtures, e.g. butyrometers for liquids contained in receptacles
- B04B5/0414—Radial chamber apparatus for separating predominantly liquid mixtures, e.g. butyrometers for liquids contained in receptacles comprising test tubes
- B04B5/0421—Radial chamber apparatus for separating predominantly liquid mixtures, e.g. butyrometers for liquids contained in receptacles comprising test tubes pivotably mounted
Definitions
- the invention relates to a laboratory centrifuge in the preamble of claim 1 mentioned type.
- the gondolas hang down and can be filled with test liquid, Usually loaded in Zentrifugiergefä touch, z. B. with several Vessels per gondola in designated shots. At higher speed the gondolas swing away.
- the advantage of this construction is that the liquid level in the vessels with respect to these remains constant.
- a disadvantage of the generic construction method is the separate individual training the gondolas, the fast circulation a strong Luftverwirbelung and thereby generates very strong, disturbing noises.
- the mentioned known construction therefore has a device for reduction the noise generated by the gondolas in the form of a closed sound-absorbing housing. But this has the disadvantage that of the gondolas Heat generated by air turbulence remains trapped in the housing and leads to unwanted heating of the sample liquid. To prevent this usually a cooling is provided, which greatly increases the cost.
- the object of the present invention is a generic laboratory centrifuge form in a simple design with lower noise level.
- turbulence generators are arranged on the surface of each nacelle, the air flowing past, which was previously laminar the surface of the Gondola rests, so disturbing that in the flow direction behind the turbulence generator a turbulent flow is present.
- the front region of the nacelle is aerodynamically smooth.
- the air flow is thus this area to about the point largest Diameter of the gondola laminar.
- the turbulence generator which is about the subsequent Surface areas of the nacelle, results in its turbulence-generating effect in areas approximately the same flow velocity, so that the Turbulence generator over its length an at least approximately constant effect having.
- the invention is therefore based on the approach for the first time, not in laboratory centrifuges to dampen the generated sounds afterwards, but already at the Reduce emergence and uses previously unnoticed, very old aerodynamic Insights, as described in "Grenz Anlagen-Theory” by Dr. Ing. Hermann Schlichting, Verlag G. Braun, Düsseldorf, 5th edition page 39 are described.
- An over the surface increased turbulence generator can, for. B. as towering Pin or a collection of towering pins be formed or z. B. as glued strips of rough sandpaper.
- a z. B. soldered wire or a towering bead or the like can be excellent effect exhibit.
- Manufacturing technology is simple training according to claim 2, in which of a cylindrical blank by milling the desired shape is achievable.
- the milled design of the turbulence generator also gives extremely high mechanical stability, as with centrifugal gondolas loaded with enormous forces is required.
- Figure 1 shows a side view of the rotor 1 of a centrifuge, the remaining parts of the Graphical simplification are not shown.
- the rotor 1 has a vertical standing wave 2 on with radially standing arms 3, in the embodiment two opposing arms with tangential axes 4 pivotally each gondola 5 is hinged.
- the gondolas 5 have centers of gravity outside of the axles 4. At standstill of rotor 1 hang down. With increasing speed they swing in Direction of the arrow 6 off.
- Figures 2 and 3 show in section along line 2-2 in Figure 1 two different Cross-sectional shapes.
- the nacelle 5 in Figure 2 has a round cross-section and the nacelle 5 'in Figure 3 rectangular cross section. It is shown that the gondolas each have a plurality of receptacles 7 for receiving suitable suitable centrifuging vessels with sample liquid to be centrifuged.
- the direction is shown in each case with arrow 8 in the Circulation of the rotor 1 to the shaft 2, the gondolas are supplied with air.
- the gondolas point in the area of their largest cross section on its surface in the direction transverse to the direction of Arrows 8, so transversely to the air flow direction extended as a turbulence generator serving wires 9, the z. B. are fixed by soldering.
- FIGS. 4 and 5 the aerodynamic effect generated by the wires 9 is shown shown how it results with a suitable Reynolds number.
- FIG. 4 shows the air inflow around the gondola 5 without wires.
- FIG. 5 shows the flow conditions with wires 9.
- the nacelle 5 is up to its area of greatest cross-section and a good deal beyond laminar air flow flows around.
- the Totwasser in the following section of the nacelle, in which decreases in cross section, ie in the flow direction on the back of the Gondola 5, tears off the flow and forms the illustrated, the Totwasser capable forming vortex street 10 whose cross-section is about the max.
- Cross section of Gondola 5 corresponds.
- the vortices in the vortex street 10 generate considerable noise, In particular, by interference with the following rotors, the not shown in Figure 4.
- the wires 9 act as turbulence generators that are too turbulent Flow behind the wires 9 lead. It forms immediately after the Wires 9 from the nacelle 5 adjacent turbulent fluidized bed. This one has compared to a laminar flow around the advantage that they continue the surface the gondola 5 follows.
- the resulting vortex street 10 'thus has a smaller one Cross section as in the case of Figure 4.
- the resulting noises are significantly reduced. In experiments with gondolas, the representation of the figure 5, noise reductions of more than 6dB could be achieved.
- the turbulence generators are by patch Wires 9 generated.
- other turbulence generators can also be used be arranged on the surface of the gondolas, such as. B. to the outside protruding beads. Even in the surface of the nacelles introduced grooves have a corresponding effect.
- line-shaped turbulence generator shown in the figures in the form of wires 9 or correspondingly elongated grooves can also point-shaped individual turbulence generator z. B. in the form of towering pins or be provided in the form of holes. These can be z. B. in a row be staggered arrangement provided and preferably in a linear Arrangement along the area of largest diameter of the nacelle 5, transversely to flow direction.
- the interference edges generated in the embodiment by the wires 9 sit on best in the area of the largest cross-section. Since this is the case of the gondola 5 '( Figure 3) extends over a greater length, in this case, the interference edges, as shown in Figure 3 in the middle of the length of the nacelle 5 'or else lie in the region of the front or rear corners, as dashed lines in Figure 3 indicated.
- Turbulence generator for example, in the nacelle 5 of Figure 2 also much further forward, so be located to the arrow 8 located. she would have to be larger, however, to have the appropriate effect.
- Figure 6 shows the embodiment of Figure 2 shows a variant in which the turbulence generators are formed as a web 9 ', which by mutual cutouts 12 are made of a cylindrical basic shape (dashed). This design can be produced in one piece with conventional machine tools.
Landscapes
- Centrifugal Separators (AREA)
Description
- Figur 1
- Eine Seitenansicht des Schwingrotors einer Zentrifuge mit zwei Schwinggondeln,
- Figur 2
- im Schnitt nach Linie 2-2 in Figur 1 den Querschnitt einer Gondel,
- Figur 3
- in Darstellung entsprechend Figur 2 eine Gondel anderen Querschnittes,
- Figur 4
- stark schematisiert das Strömungsbild um die Gondel gemäß Figur 2 ohne Turbulenzerzeuger,
- Figur 5
- in Darstellung gemäß Figur 4 die Anströmung mit Turbulenzerzeugern und
- Figur 6
- im Schnitt entsprechend Figur 2 eine Gondel in einer weiteren Ausführungsvariante.
Claims (2)
- Laborzentrifuge mit wenigstens einer ausschwenkbar an einem drehangetriebenen Rotor (1) gelagerten, Probeflüssigkeit aufnehmenden Gondel (5, 5', 5") und mit einer Einrichtung (9, 9') zur Reduzierung des von der Gondel erzeugten Geräusches, dadurch gekennzeichnet, daß die Gondel (5, 5') in ihrem in Fahrtrichtung vom liegenden Oberflächenbereich aerodynamisch glatt ausgebildet ist, und daß die Einrichtung aus wenigstens einem an der Außenoberfläche der Gondel (5, 5') angeordneten Turbulenzerzeuger (9, 9') besteht, der im Bereich des quer zur Richtung (8) der Luftströmung größten Durchmessers der Gondel (5, 5') linienförmig quer zur Strömungsrichtung erstreckt und über die Oberfläche der Gondel (5, 5') aufragend ausgebildet ist.
- Laborzentrifuge nach Anspruch 1, dadurch gekennzeichnet, daß der Turbulenzerzeuger als parallel zur Achse einer zylindrischen Gondel (5") zwischen zwei Ausfräsungen (12) gebildeter Steg (9') ausgebildet ist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10155955A DE10155955C2 (de) | 2001-11-09 | 2001-11-09 | Schwingrotorlaborzentrifuge mit Geräuschreduzierungseinrichtung |
DE10155955 | 2001-11-09 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1310304A1 EP1310304A1 (de) | 2003-05-14 |
EP1310304B1 true EP1310304B1 (de) | 2005-12-07 |
Family
ID=7705736
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02018698A Expired - Lifetime EP1310304B1 (de) | 2001-11-09 | 2002-08-21 | Schwingrotorlaborzentrifuge mit Geräuschreduzierungseinrichtung |
Country Status (3)
Country | Link |
---|---|
US (1) | US6746391B2 (de) |
EP (1) | EP1310304B1 (de) |
DE (2) | DE10155955C2 (de) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004012025C5 (de) * | 2004-03-10 | 2012-04-05 | Eppendorf Ag | Laborzentrifuge mit Ausschwingbehältern |
DE202015006013U1 (de) | 2015-04-23 | 2015-09-28 | Thermo Electron Led Gmbh | Hybridrotor für eine Zentrifuge, Set mit Hybridrotor und Zentrifugenbehälter und derartiger Zentrifugenbehälter |
DE102015005195B4 (de) | 2015-04-23 | 2021-03-04 | Thermo Electron Led Gmbh | Hybridrotor für eine Zentrifuge, Set mit Hybridrotor und Zentrifugenbehälter und derartiger Zentrifugenbehälter |
US10252278B2 (en) * | 2015-04-23 | 2019-04-09 | Thermo Electron Led Gmbh | Centrifuge container with reduced flow resistance and set comprising a centrifuge container and a centrifuge rotor |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2018837A (en) * | 1933-07-12 | 1935-10-29 | Collatz Ewald | Centrifugal device |
DE7224033U (de) * | 1972-06-27 | 1972-10-12 | Heraeus-Christ Gmbh | Kleinzentrifuge |
US3832085A (en) * | 1972-10-04 | 1974-08-27 | Ford Motor Co | Automotive fan shroud |
US3873021A (en) * | 1973-05-18 | 1975-03-25 | Du Pont | Wire frame centrifuge |
US4820257A (en) * | 1988-05-10 | 1989-04-11 | Beckman Instruments, Inc. | Rotor noise suppression |
FR2651449B1 (fr) * | 1989-09-04 | 1993-04-30 | Jouan Sa | Centrifugeur comportant un rotor a carenage. |
DE4310104C2 (de) * | 1993-03-27 | 1997-04-30 | Deutsche Forsch Luft Raumfahrt | Verfahren zur Reduzierung der Schallemission sowie zur Verbesserung der Luftleistung und des Wirkungsgrads bei einer axialen Strömungsmaschine und Strömungsmaschine |
SE505385C2 (sv) * | 1995-11-17 | 1997-08-18 | Alfa Laval Ab | Rotor för en centrifugalseparator |
DE19953453C2 (de) * | 1999-11-05 | 2003-11-27 | Kendro Lab Prod Gmbh | Zentrifugeneinsatz für Mikrotiterplatten |
JP2002253991A (ja) * | 2001-03-02 | 2002-09-10 | Hitachi Koki Co Ltd | 遠心機 |
-
2001
- 2001-11-09 DE DE10155955A patent/DE10155955C2/de not_active Expired - Fee Related
-
2002
- 2002-08-21 DE DE50205181T patent/DE50205181D1/de not_active Expired - Lifetime
- 2002-08-21 EP EP02018698A patent/EP1310304B1/de not_active Expired - Lifetime
- 2002-11-07 US US10/289,937 patent/US6746391B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE10155955A1 (de) | 2003-05-28 |
US20030092553A1 (en) | 2003-05-15 |
DE50205181D1 (de) | 2006-01-12 |
EP1310304A1 (de) | 2003-05-14 |
DE10155955C2 (de) | 2003-10-30 |
US6746391B2 (en) | 2004-06-08 |
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