EP0648541A2 - Centrifugeuse pour laboratoire s'arrêtant en cas de déséquilibre - Google Patents

Centrifugeuse pour laboratoire s'arrêtant en cas de déséquilibre Download PDF

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Publication number
EP0648541A2
EP0648541A2 EP94115988A EP94115988A EP0648541A2 EP 0648541 A2 EP0648541 A2 EP 0648541A2 EP 94115988 A EP94115988 A EP 94115988A EP 94115988 A EP94115988 A EP 94115988A EP 0648541 A2 EP0648541 A2 EP 0648541A2
Authority
EP
European Patent Office
Prior art keywords
centrifuge
stator
field strength
motor
detector
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
Application number
EP94115988A
Other languages
German (de)
English (en)
Other versions
EP0648541B1 (fr
EP0648541A3 (fr
Inventor
Bernd Keller
Matthias Meyer
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.)
Geratebau Eppendorf GmbH
Original Assignee
Geratebau Eppendorf GmbH
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 Geratebau Eppendorf GmbH filed Critical Geratebau Eppendorf GmbH
Publication of EP0648541A2 publication Critical patent/EP0648541A2/fr
Publication of EP0648541A3 publication Critical patent/EP0648541A3/fr
Application granted granted Critical
Publication of EP0648541B1 publication Critical patent/EP0648541B1/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
    • B04B9/00—Drives specially designed for centrifuges; Arrangement or disposition of transmission gearing; Suspending or balancing rotary bowls
    • B04B9/14—Balancing rotary bowls ; Schrappers
    • B04B9/146—Unbalance detection devices

Definitions

  • the invention relates to a centrifuge of the type mentioned in the preamble of claim 1.
  • Centrifuges of the type mentioned at the outset are therefore provided with switch-off devices which switch off the motor above a limit unbalance which has been determined in experiments for the respective centrifuge type and which can still be tolerated.
  • Very complex shutdown devices are known in the prior art, e.g. Monitor magnetic fields generated by the rotor using magnetic field detectors and determine the unbalance from them.
  • centrifuges of the type mentioned at the outset which the applicant has been selling for years, have a mechanical switch as the element on the housing side, which is touched and switched when the stator is deflected by the element attached to it.
  • this construction has two major disadvantages.
  • mechanical switches are at risk of failure and, on the other hand, mechanical adjustment of the switch or of the stator-side element is necessary to ensure that the switch-off takes place precisely at the predetermined limit unbalance. This increases the assembly costs of the centrifuge.
  • the deflection depends on the tolerances of the bearing and thus differs for single specimens with the same imbalance.
  • the object of the present invention is therefore to create a centrifuge of the type mentioned at the outset, which can be produced inexpensively with great long-term reliability.
  • the field strength detector is consequently acted upon by the field with different strengths.
  • changes in field strength are fully examined in a suitable manner by the evaluation device. It can be absolute Values of the change or, for example, also be evaluated for the acceleration behavior. If certain predetermined values are reached or exceeded, the evaluation device switches off the motor. It is advantageous to avoid mechanically acting components, since both the field generator and the field strength detector manage without mechanical components. It is also advantageous that a field strength detector can detect movement-related field fluctuations at a largely arbitrary distance from the field generator. So it is not a question of exact adjustment of the two elements against each other.
  • the evaluation is not limited to the evaluation of absolute values of the deflection, there is the possibility of maintaining very precise switch-off conditions in a manner adapted to the requirements, for example by means of sophisticated algorithms. For example, it can be evaluated in such a way that short-term exceeding of predetermined limit values is tolerated and the switch-off only occurs when the long-term or multiple exceeding.
  • the evaluation device could maintain a fixed limit amplitude for all centrifuges of one type. But that would lead to problems due to manufacturing tolerances.
  • the elastic stator bearings provided for absorption of smaller, still tolerable unbalance have tolerances, particularly in the case of very inexpensive centrifuges.
  • the stator can experience different deflections while the limit unbalance is still permissible, which leads to different amplitudes. If a fixed limit amplitude was set for all centrifuges, the switch-off would take place with different imbalances, which is not desirable.
  • the features of claim 5 are therefore advantageously provided.
  • the centrifuge can be operated in calibration mode with limit unbalance, for example by inserting a test weight into one of the vessel holders.
  • the calibration device determines the amplitude that occurs, advantageously in order to create reproducible conditions, always at a certain low engine speed, which is specified by the calibration device of the engine control system.
  • the amplitude determined in the calibration mode is stored as a limit amplitude in the evaluation device and is available for the later operation of the centrifuge of the evaluation device as a limit amplitude for its monitoring function.
  • This design of the calibration device enables two calibration test runs with different test weights, one of which generates an unbalance below the limit unbalance and the other produces an unbalance above the limit unbalance. This ensures that the centrifuge is operated once with an unbalance in the safe range and once with an unbalance in the tolerance range above the limit unbalance. This results in a statement during the calibration operation that the centrifuge and its evaluation device are within the tolerance range of the limit unbalance sure works.
  • a third calibration test run with a test weight that exactly generates the limit unbalance is hurriedly saved in this general formation of the calibration device, since the limit amplitude is determined by interpolation of the two calibration test runs that are then stored in the evaluation device.
  • the invention is shown, for example and schematically, in a side view of a laboratory centrifuge.
  • a base plate 1 On a base plate 1 there are several supports 2 which are connected via spring-elastic, e.g. bearings 3 made of rubber blocks hold the stator 4 of the centrifuge, which is formed by the housing of an electric motor formed in the stator 4 and not shown in the figure.
  • spring-elastic e.g. bearings 3 made of rubber blocks hold the stator 4 of the centrifuge, which is formed by the housing of an electric motor formed in the stator 4 and not shown in the figure.
  • the electric motor in the stator 4 has a shaft 5 aligned in a vertical arrangement, on which a rotor 6 is arranged, which has the outline shape customary for laboratory centrifuges.
  • vessel holders are provided in one of the usual types of construction.
  • a housing surrounding the entire construction, already necessary for safety reasons, with an access flap to the top of the rotor 6 is omitted for the sake of illustration.
  • An electronic device 7 is also arranged on the base plate 1, which has an externally accessible front plate 8 with a display 9 and keyboard 10.
  • the electronic device 7 has devices for speed control of the electric motor provided in the stator 4 and allows the desired speed control of the centrifuge by input on the keyboard 10 with a display on the display 9.
  • the electronics device 7 has a Hall detector 11 on its upper side, which can be integrated, for example, on an electronics board provided there.
  • the Hall detector 11 is arranged fixed with respect to the base plate 1 and contacted with electrical connections with an evaluation device provided in the electronics device 7.
  • a permanent magnet 13 is fastened to the stator 4 via an arm 12, specifically in a position in the vicinity of the Hall detector 11. Fine adjustments are not necessary here. In the case of assembly tolerances or piece tolerances of the bearings 3, positional deviations do not interfere, since the Hall detector 11 always detects the magnetic field generated by the permanent magnet 13 even when the distances are different.
  • the Hall detector 11 sees a field that is constant over time. If the centrifuge is put into operation and imbalances occur, the stator 4 is articulated around its mounting in the bearings 3. These deflections are particularly large at low speeds in the area of the resonance of the bearings and can be evaluated well in this area. With these articulations, the arm 12 makes movements with components in the direction of the two double arrows, which are shown next to the arm 12 in the figure. These movements of the arm lead to reciprocating movements of the permanent magnet 13 above the Hall detector 11 and thus to changes in the magnetic field strength at the location of the Hall detector 11.
  • the evaluation device connected to the Hall detector 11 consequently receives a signal of varying strength, which can be evaluated in any way.
  • the amplitudes of this signal are preferably evaluated as a measure reflecting the unbalance.
  • a permanent memory e.g. an EEPROM
  • the value of a permissible limit amplitude can be stored, with which the evaluation device constantly compares the amplitude currently measured. If the limit amplitude is exceeded, the evaluation device triggers the switching off of the motor via the electronic device 7 and its devices controlling the motor.
  • the limit amplitude can be determined in tests for a centrifuge type and stored in the electronic device 7. In this mode of operation is therefore always switched off at a certain deflection amplitude.
  • the electronic device 7 can contain a calibration device, which is called up, for example, via the keyboard 10 with a service code.
  • the calibration device is designed such that, for example, it requests the calibration operation on the display 9, for which a test weight of such a size is placed in the rotor 6 that the rotor 6 is brought to unbalance.
  • the calibration device determines the amplitude that then occurs and stores it in the permanent memory of the evaluation device for later use.
  • the calibration device is designed such that it requests two calibration test runs that are carried out with two different test weights, one of which generates an unbalance below and one of an unbalance above the limit unbalance.
  • the calibration device determines the amplitudes of the signal generated by the Hall detector 11 and results in an interpolation value calculated therefrom as a limit amplitude.
  • a calibration test run at 2.2 g and a calibration test run at 2.9 g can be carried out, for example, for a centrifuge type in which a permissible unbalance of 2.5 g was guaranteed to the customer.
  • a limit amplitude corresponding to an imbalance of 2.5 g is determined on the interpolation of the determined amplitudes.
  • the arrangement of permanent magnet 13 and Hall detector 11 can be varied.
  • the permanent magnet 13 is above the Hall detector 11.
  • the two elements 11, 13 can, for example, also be arranged side by side.
  • the cheapest arrangement for detecting the deflections of the stator 4 can be determined in experiments and depends, for example, on the construction of the holder for the stator. It is also possible to arrange the Hall detector 11 on the arm 12 and the permanent magnet 13 firmly with respect to the housing, that is to say the base plate 1.
  • fields other than magnetic fields can also be used.
  • the element 13 can generate a static electric field, which is detected by the element 11.
  • the elements 11 and 13 can thus act, for example, in the manner of an electrical capacitor. It is also possible to use alternating electromagnetic fields, for example light.
  • One of the two elements 11, 13 can be designed as a light source and the other as a photosensitive element.

Landscapes

  • Centrifugal Separators (AREA)
  • Testing Of Balance (AREA)
EP94115988A 1993-10-15 1994-10-11 Centrifugeuse pour laboratoire s'arrêtant en cas de déséquilibre Expired - Lifetime EP0648541B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4335119 1993-10-15
DE4335119A DE4335119C2 (de) 1993-10-15 1993-10-15 Laborzentrifuge mit Unwuchtabschaltung

Publications (3)

Publication Number Publication Date
EP0648541A2 true EP0648541A2 (fr) 1995-04-19
EP0648541A3 EP0648541A3 (fr) 1995-09-20
EP0648541B1 EP0648541B1 (fr) 2000-02-23

Family

ID=6500178

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94115988A Expired - Lifetime EP0648541B1 (fr) 1993-10-15 1994-10-11 Centrifugeuse pour laboratoire s'arrêtant en cas de déséquilibre

Country Status (5)

Country Link
US (1) US5496254A (fr)
EP (1) EP0648541B1 (fr)
JP (1) JP3448113B2 (fr)
AT (1) ATE189863T1 (fr)
DE (2) DE4335119C2 (fr)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3710001B2 (ja) * 1995-06-16 2005-10-26 日立工機株式会社 遠心分離機
US5955855A (en) * 1997-04-09 1999-09-21 Medar, Inc. Method and system for tuning a drive to its coupled motor to minimize motor resonance and sensing device for use therein
DE29712121U1 (de) * 1997-07-10 1997-09-11 Sigma Laborzentrifugen Gmbh, 37520 Osterode Steuerungseinrichtung für eine Laborzentrifuge
US5800331A (en) * 1997-10-01 1998-09-01 Song; Jin Y. Imbalance detection and rotor identification system
JP3968960B2 (ja) * 1999-07-15 2007-08-29 日立工機株式会社 遠心機
US6379109B1 (en) 2000-05-12 2002-04-30 Roy F. Senior, Jr. Method and apparatus for detecting and removing obstructions in mechanical aerators
US6635007B2 (en) * 2000-07-17 2003-10-21 Thermo Iec, Inc. Method and apparatus for detecting and controlling imbalance conditions in a centrifuge system
US6350224B1 (en) 2000-07-17 2002-02-26 Westinghouse Savannah River Company, Llc Centrifugal unbalance detection system
US7055368B2 (en) * 2002-05-21 2006-06-06 Kendro Laboratory Products, Inc. Automatic calibration of an imbalance detector
JP4352844B2 (ja) * 2003-10-09 2009-10-28 日立工機株式会社 遠心機
US7635328B2 (en) * 2005-12-09 2009-12-22 Pacific Centrifuge, Llc Biofuel centrifuge
US7555933B2 (en) * 2006-08-01 2009-07-07 Thermo Fisher Scientific Inc. Method and software for detecting vacuum concentrator ends-of-runs
DE102011078475B4 (de) * 2011-06-30 2013-05-23 Hanning Elektro-Werke Gmbh & Co. Kg Dynamische Ausgleichsvorrichtung eines Rotationskörpers
DE102014102472B4 (de) * 2014-02-25 2021-04-22 Andreas Hettich Gmbh & Co. Kg Zentrifuge
DE102014116527B4 (de) * 2014-11-12 2020-01-23 Andreas Hettich Gmbh & Co. Kg Zentrifuge und Verfahren zur Erfassung von Unwuchten in der Zentrifuge

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1144195B (de) * 1960-03-17 1963-02-21 Reactor Centrum Nederland Einrichtung zum Anzeigen, Registrieren und Beeinflussen von Bewegungen der Rotationsachse und der Drehzahl des Rotors einer Zentrifuge
EP0082956A1 (fr) * 1981-12-24 1983-07-06 Kontron-Holding Ag Dispositif de mesure sans contact direct du défaut d'équilibrage
US4700117A (en) * 1985-05-31 1987-10-13 Beckman Instruments, Inc. Centrifuge overspeed protection and imbalance detection system
DE3935616A1 (de) * 1989-10-26 1991-05-02 Sigma Laborzentrifugen Gmbh Vorrichtung zur ueberwachung des betriebs von zentrifugen

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE216868C (fr) *
DE1780185U (de) * 1958-04-14 1958-12-24 Heinz Janetzki Zentrifuge mit senkrecht angeordnetem rotor.
US2895023A (en) * 1958-06-20 1959-07-14 Sorvall Inc Ivan Centrifuge deviation sensing switching mechanism
US3676723A (en) * 1970-03-02 1972-07-11 Bio Consultants Inc High speed centrifuge drive assembly
JPS539570U (fr) * 1976-07-09 1978-01-26
US4214179A (en) * 1979-03-15 1980-07-22 Beckman Instruments, Inc. Rotor imbalance detector for a centrifuge
SU1156740A1 (ru) * 1982-10-19 1985-05-23 Специальное Конструкторское Бюро Биофизической Аппаратуры Устройство дл контрол работы ультрацентрифуги
GB8324913D0 (en) * 1983-09-17 1983-10-19 Fisons Plc Electrical detection device
FR2622290B1 (fr) * 1987-10-22 1990-03-30 Jouan Dispositif pour la detection du balourd d'une machine tournante, a partir d'un seuil predetermine
SU1704840A1 (ru) * 1988-07-18 1992-01-15 Московское научно-производственное объединение "Биофизприбор" Устройство дл контрол центрифуги
JPH0726669B2 (ja) * 1988-09-09 1995-03-29 日立工機株式会社 回転体の不つりあい検出方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1144195B (de) * 1960-03-17 1963-02-21 Reactor Centrum Nederland Einrichtung zum Anzeigen, Registrieren und Beeinflussen von Bewegungen der Rotationsachse und der Drehzahl des Rotors einer Zentrifuge
EP0082956A1 (fr) * 1981-12-24 1983-07-06 Kontron-Holding Ag Dispositif de mesure sans contact direct du défaut d'équilibrage
US4700117A (en) * 1985-05-31 1987-10-13 Beckman Instruments, Inc. Centrifuge overspeed protection and imbalance detection system
DE3935616A1 (de) * 1989-10-26 1991-05-02 Sigma Laborzentrifugen Gmbh Vorrichtung zur ueberwachung des betriebs von zentrifugen

Also Published As

Publication number Publication date
JP3448113B2 (ja) 2003-09-16
JPH07275739A (ja) 1995-10-24
EP0648541B1 (fr) 2000-02-23
DE59409153D1 (de) 2000-03-30
ATE189863T1 (de) 2000-03-15
EP0648541A3 (fr) 1995-09-20
DE4335119A1 (de) 1995-04-20
US5496254A (en) 1996-03-05
DE4335119C2 (de) 1997-11-20

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