EP0226886A1 - Centrifuge - Google Patents
Centrifuge Download PDFInfo
- Publication number
- EP0226886A1 EP0226886A1 EP86116668A EP86116668A EP0226886A1 EP 0226886 A1 EP0226886 A1 EP 0226886A1 EP 86116668 A EP86116668 A EP 86116668A EP 86116668 A EP86116668 A EP 86116668A EP 0226886 A1 EP0226886 A1 EP 0226886A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rotor
- information
- coding
- information carrier
- centrifuge
- 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.)
- Granted
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B13/00—Control arrangements specially designed for centrifuges; Programme control of centrifuges
- B04B13/003—Rotor identification systems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B7/00—Elements of centrifuges
Definitions
- the invention relates to a centrifuge with an exchangeable rotor which is provided with an information carrier for machine-readable information, and a reading device which has detectors for scanning the information carrier and an electronic circuit for processing the recorded information.
- Centrifuges are generally used to separate sample particles in a liquid medium.
- rotors e.g. Angle rotors, swing-out rotors, vertical rotors, zonal rotors.
- the individual rotors differ in their different performance features, such as the maximum achievable centrifugal force and the maximum usable volume.
- centrifuges are often not only used for one application, different interchangeable rotors are used for one device. Under no circumstances may the maximum speed of the rotor used be exceeded.
- Modern centrifuges therefore usually have a corresponding rotor-specific overspeed protection, for example an optical scanning of a light / dark disc by means of an optocoupler or similar methods or magnetic interrogation of a toothed lock washer or permanent magnets.
- Both methods are used to generate a frequency which switches off the centrifuge drive when the permissible value is exceeded.
- the aforementioned query is often omitted.
- the overspeed protection is guaranteed by the air resistance.
- High-speed centrifuges usually have cooling to keep the sample temperature inside the rotor constant. This class of centrifuges does not have a vacuum device as is required for ultracentrifuges that rotate even faster.
- the air resistance depending on the size, shape, surface and speed of the rotor used must be taken into account when controlling the temperature. This means that the cooling capacity must be adjusted accordingly. This is accomplished by a compensation circuit. The correct compensation value can be found in the corresponding nomograms of the individual rotors.
- the preselection of the rotor type is sufficient to automatically take the compensation from the memory of the microprocessor into account when preselecting the temperature.
- the same also applies to partially evacuated centrifuges.
- the object of the invention is to remedy this deficiency.
- the information carrier has a series of permanent magnet pins arranged distributed around the rotor, some of which face the detectors with their north and some with their south poles.
- This positive rotor detection requires a factory coding of the rotor.
- This coding can, for example, provide the following information to the query electronics: year of manufacture, serial number, rotor type and permissible maximum speed.
- the magnetic pin coding is the safest contactless type because of its robustness and the north or south pole orientation.
- the magnets are arranged radially around the axis of rotation. Some of the magnets are used for speed monitoring and the other for coding. Both subsets differ in polarity.
- the centrifuge shown in FIG. 1 is a fixed-angle centrifuge in which the sample vessels 1 are arranged in the rotor 2 at a certain angle of inclination. On its underside, the rotor carries a carrier ring 3 for receiving the coding.
- two sensors 4, 4a are arranged opposite it for scanning the coding.
- the rotor is driven by a drive axle 5.
- the axis is mounted in a fixed bearing housing 6 and is driven by a drive unit 7.
- the end face of the carrier ring 3 is shown in Fig. 2. It has 24 bores 8, evenly distributed over its circumference, into which suitable permanent magnet pins 9, 10 are inserted. The magnetic pins are inserted so that some of their south poles and some of their north poles face outwards.
- a larger amount of information can be encoded by using North and South Poland.
- the 15 positions of sectors a, b, c and thus 15 bits are available for rotor detection. In these 15 positions, used lifts with their north poles facing outwards. They are divided into 4 bits (sector a) for the year of manufacture, 7 bits (sector b) for the serial number and 4 bits (sector c) for the rotor type.
- the magnetic pins of sector d are facing outwards with their south poles. They are used for coding the speed.
- the microprocessor needs a start bit to recognize the start of the coding. Since the magnets for the speed monitoring are used in a different polarity than the coding magnets, the start information is automatically obtained when the polarity changes due to the rotation.
- a second sensor (4a) permits independent monitoring of both the speed and the coding in the case of electrical isolation, in order to meet even the strictest safety regulations.
- the circuit for detecting the coding shown in FIG. 3, for example, is constructed as follows, reference being made simultaneously to the signal diagrams in FIG.
- the magnetic sensor 4 has a supply voltage of + 12 volts.
- the signal output has a DC potential of + 6 volts.
- the magnets rotating past the sensor generate pulses with a signal voltage of approximately 270 mVpp. These are superimposed on the output voltage (Fig. 4a).
- the sensor 4 is connected to the inverting input of an operational amplifier 11.
- the signal is amplified and inverted approximately 30 times in the operational amplifier 11 (FIG. 4b).
- the other input of the amplifier 11 is supplied with a bias voltage by a potentiometer 12, which keeps the output at + 6 volts.
- the output of the amplifier 11 is connected to the non-inverting input of an operational amplifier 13 and to the inverting input of an operational amplifier 14.
- the second input of the amplifier 13 is connected to a bias voltage of approximately 8 volts with the aid of the resistors 15, 16, 17. This ensures that only the interference-free positive peaks of the output signal of the amplifier 11 are converted into a square-wave signal (FIG. 4c).
- the amplifier 14 has a second input between the resistors 16 and 17 at 4 volts. In this way, it inverts the negative pulses of signal 46 and also supplies a square-wave signal (FIG. 4d).
- the output signal of amplifier 13 (FIG. 4c) is fed to a speed monitoring device (not shown), while the output signal of amplifier 14 (FIG. 4d) containing the rotor coding is fed to a microprocessor (not shown) for processing.
Landscapes
- Centrifugal Separators (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH528585 | 1985-12-11 | ||
CH5285/85 | 1985-12-11 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0226886A1 true EP0226886A1 (fr) | 1987-07-01 |
EP0226886B1 EP0226886B1 (fr) | 1990-08-29 |
EP0226886B2 EP0226886B2 (fr) | 1994-01-05 |
Family
ID=4291022
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP86116668A Expired - Lifetime EP0226886B2 (fr) | 1985-12-11 | 1986-12-01 | Centrifuge |
Country Status (5)
Country | Link |
---|---|
US (1) | US4772254A (fr) |
EP (1) | EP0226886B2 (fr) |
JP (1) | JPS62140659A (fr) |
DE (1) | DE3673782D1 (fr) |
FI (1) | FI864811A (fr) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3815449A1 (de) * | 1988-05-06 | 1989-11-16 | Sigma Laborzentrifugen Gmbh | Zentrifuge, insbesondere laborzentrifuge |
DE4037458A1 (de) * | 1990-11-24 | 1992-05-27 | Heraeus Sepatech | Zentrifuge und verfahren zum betreiben der zentrifuge |
EP0494421A1 (fr) * | 1991-01-07 | 1992-07-15 | Beckman Instruments, Inc. | Tachymètre et système d'identification de rotor pour centrifugeuses |
EP0560391A2 (fr) * | 1992-03-13 | 1993-09-15 | Maschinenfabrik Berthold Hermle Aktiengesellschaft | Centrifugeuse |
EP0602587A1 (fr) * | 1992-12-14 | 1994-06-22 | E.I. Du Pont De Nemours And Company | Système d'identification rotor centrifuge et de contrôle d'instrument |
EP0604912A2 (fr) | 1992-12-28 | 1994-07-06 | Kabushiki Kaisha Kubota Seisakusho | Centrifugeuse et rotor destiné à être utilisé avec celle-ci |
DE4420562A1 (de) * | 1994-06-13 | 1995-12-14 | Busch Dieter & Co Prueftech | Meßgerät mit einer integrierten Licht-Abtasteinrichtung |
DE19723984C2 (de) * | 1997-06-06 | 2000-02-17 | Kendro Lab Prod Gmbh | Auswechselbarer Zentrifugen-Rotor mit wenigstens einem Magnetkörper als Informationsträger sowie ein Verfahren zum Einbringen eines Magnetkörpers |
Families Citing this family (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4857811A (en) * | 1988-03-31 | 1989-08-15 | E. I. Du Pont De Nemours And Company | Evacuation pump control for a centrifuge instrument |
SU1734865A1 (ru) * | 1988-07-18 | 1992-05-23 | Московское научно-производственное объединение "Биофизприбор" | Устройство дл контрол центрифуги |
DE69026039T2 (de) * | 1989-12-08 | 1996-08-22 | Hitachi Koki Kk | System zum Festlegen der Betriebsbedingungen von Zentrifugenrotoren |
FR2657793B1 (fr) * | 1990-02-06 | 1992-04-24 | Jouan | Appareil de centrifugation a rotor amovible et a moyens d'identification des rotors. |
US5235864A (en) * | 1990-12-21 | 1993-08-17 | E. I. Du Pont De Nemours And Company | Centrifuge rotor identification system based on rotor velocity |
US5338283A (en) * | 1992-10-09 | 1994-08-16 | E. I. Du Pont De Nemours And Company | Centrifuge rotor identification system |
US5518493A (en) * | 1994-07-07 | 1996-05-21 | Beckman Instruments, Inc. | Automatic rotor identification based on a rotor-transmitted signal |
US5786898A (en) * | 1996-08-23 | 1998-07-28 | Fitzpatrick; Stephen T. | Structure and method for centrifugal sedimentation particle size analysis of particles of lower density than their suspension medium |
FR2799395B1 (fr) * | 1999-10-08 | 2001-12-21 | Jouan | Centrifugeuse a rotor presentant au moins un logement de reception d'un produit a centrifuger et un couvercle associe de fermeture, et ensemble comprenant une telle centrifugeuse et plusieurs rotors |
US6368265B1 (en) | 2000-04-11 | 2002-04-09 | Kendro Laboratory Products, L.P. | Method and system for energy management and overspeed protection of a centrifuge |
JP3951582B2 (ja) | 2000-10-06 | 2007-08-01 | 日立工機株式会社 | 遠心分離機 |
US6572523B2 (en) | 2001-04-05 | 2003-06-03 | Fleetguard, Inc. | Centrifuge rotation indicator |
US6589151B2 (en) * | 2001-04-27 | 2003-07-08 | Hitachi Koki Co., Ltd. | Centrifugal separator capable of reading a rotor identification signal under different rotor rotation conditions |
JP3956646B2 (ja) * | 2001-05-21 | 2007-08-08 | 日立工機株式会社 | 遠心機 |
JP5035632B2 (ja) * | 2008-05-08 | 2012-09-26 | 日立工機株式会社 | 遠心分離機 |
US8182409B2 (en) * | 2008-09-09 | 2012-05-22 | The Western States Machine Company | Centrifuge comprising magnetically coupled rotating basket |
DE102008042971A1 (de) | 2008-10-20 | 2010-04-22 | Agilent Technologies Inc., Santa Clara | Zentrifuge mit Magneteinrichtung |
DE102011100044B4 (de) * | 2011-04-29 | 2017-10-05 | Thermo Electron Led Gmbh | Sensoranordnung zur Identifikation eines in eine Zentrifuge eingesetzten Rotors und Zentrifuge |
CN104338624B (zh) * | 2013-08-07 | 2017-03-15 | 上海安亭科学仪器厂 | 一种离心机转子状态自动识别系统 |
CN104588219A (zh) * | 2014-12-30 | 2015-05-06 | 上海力申科学仪器有限公司 | 离心机转子 |
GB2550185B (en) * | 2016-05-12 | 2019-08-14 | Cambustion | Method to improve classification of particles in a gas stream by reducing thermal convective instabilities |
CN115400886A (zh) * | 2021-05-28 | 2022-11-29 | 青岛海特生物医疗有限公司 | 离心机转子识别系统及用于离心机转子识别的方法、装置 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0138383A2 (fr) * | 1983-09-17 | 1985-04-24 | FISONS plc | Centrifuge pourvue d'un système d'identification du rotor |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4551715A (en) * | 1984-04-30 | 1985-11-05 | Beckman Instruments, Inc. | Tachometer and rotor identification apparatus for centrifuges |
US4663601A (en) * | 1984-11-21 | 1987-05-05 | Xomox Corporation | Magnetic switch housing assembly |
-
1986
- 1986-11-26 FI FI864811A patent/FI864811A/fi not_active IP Right Cessation
- 1986-12-01 EP EP86116668A patent/EP0226886B2/fr not_active Expired - Lifetime
- 1986-12-01 DE DE8686116668T patent/DE3673782D1/de not_active Expired - Lifetime
- 1986-12-03 US US06/937,264 patent/US4772254A/en not_active Expired - Fee Related
- 1986-12-09 JP JP61293340A patent/JPS62140659A/ja active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0138383A2 (fr) * | 1983-09-17 | 1985-04-24 | FISONS plc | Centrifuge pourvue d'un système d'identification du rotor |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3815449A1 (de) * | 1988-05-06 | 1989-11-16 | Sigma Laborzentrifugen Gmbh | Zentrifuge, insbesondere laborzentrifuge |
DE4037458A1 (de) * | 1990-11-24 | 1992-05-27 | Heraeus Sepatech | Zentrifuge und verfahren zum betreiben der zentrifuge |
US5383838A (en) * | 1991-01-07 | 1995-01-24 | Beckman Instruments, Inc. | Tachometer and rotor identification system for centrifuges |
US5221250A (en) * | 1991-01-07 | 1993-06-22 | Beckman Instruments, Inc. | Coding of maximum operating speed on centrifuge rotors and detection thereof |
EP0494421A1 (fr) * | 1991-01-07 | 1992-07-15 | Beckman Instruments, Inc. | Tachymètre et système d'identification de rotor pour centrifugeuses |
EP0560391A2 (fr) * | 1992-03-13 | 1993-09-15 | Maschinenfabrik Berthold Hermle Aktiengesellschaft | Centrifugeuse |
EP0560391A3 (en) * | 1992-03-13 | 1994-08-10 | Hermle Berthold Maschf Ag | Centrifuge |
EP0602587A1 (fr) * | 1992-12-14 | 1994-06-22 | E.I. Du Pont De Nemours And Company | Système d'identification rotor centrifuge et de contrôle d'instrument |
EP0604912A2 (fr) | 1992-12-28 | 1994-07-06 | Kabushiki Kaisha Kubota Seisakusho | Centrifugeuse et rotor destiné à être utilisé avec celle-ci |
EP0604912A3 (fr) * | 1992-12-28 | 1995-01-11 | Kubota Med Appliance Supply | Centrifugeuse et rotor destiné à être utilisé avec celle-ci. |
DE4420562A1 (de) * | 1994-06-13 | 1995-12-14 | Busch Dieter & Co Prueftech | Meßgerät mit einer integrierten Licht-Abtasteinrichtung |
US5612544A (en) * | 1994-06-13 | 1997-03-18 | Pruftechnik Dieter Busch Ag | Measuring device with an integrated light scanning means which scans both rotations of a rotating body and coded data associated with the rotating body |
DE4420562C2 (de) * | 1994-06-13 | 1999-11-18 | Busch Dieter & Co Prueftech | Drehzahlmeßgerät |
DE19723984C2 (de) * | 1997-06-06 | 2000-02-17 | Kendro Lab Prod Gmbh | Auswechselbarer Zentrifugen-Rotor mit wenigstens einem Magnetkörper als Informationsträger sowie ein Verfahren zum Einbringen eines Magnetkörpers |
Also Published As
Publication number | Publication date |
---|---|
JPS62140659A (ja) | 1987-06-24 |
JPS6333911B2 (fr) | 1988-07-07 |
FI864811A0 (fi) | 1986-11-26 |
US4772254A (en) | 1988-09-20 |
FI864811A (fi) | 1987-06-12 |
EP0226886B1 (fr) | 1990-08-29 |
EP0226886B2 (fr) | 1994-01-05 |
DE3673782D1 (de) | 1990-10-04 |
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