EP0648541B1 - Laborzentrifuge mit Unwuchtabschaltung - Google Patents

Laborzentrifuge mit Unwuchtabschaltung Download PDF

Info

Publication number
EP0648541B1
EP0648541B1 EP94115988A EP94115988A EP0648541B1 EP 0648541 B1 EP0648541 B1 EP 0648541B1 EP 94115988 A EP94115988 A EP 94115988A EP 94115988 A EP94115988 A EP 94115988A EP 0648541 B1 EP0648541 B1 EP 0648541B1
Authority
EP
European Patent Office
Prior art keywords
centrifuge
stator
constructed
field strength
imbalance
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
Application number
EP94115988A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0648541A2 (de
EP0648541A3 (de
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/de
Publication of EP0648541A3 publication Critical patent/EP0648541A3/de
Application granted granted Critical
Publication of EP0648541B1 publication Critical patent/EP0648541B1/de
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 in the preamble of the claim 1 Art.
  • the rotor With such centrifuges, the rotor is balanced during its manufacture. Still, it can be broken or uneven Loading of the vessel holders can lead to imbalance, which is only in certain Limits is tolerable, because otherwise during the operation of the centrifuge, Damage can occur especially at higher speeds.
  • Centrifuges of the type mentioned are therefore with shutdown devices provided above one for the respective centrifuge type limit unbalance determined in tests that is still tolerated can be turned off the engine.
  • From DE-GM 17 80 185 is a centrifuge with a shutdown device known as mechanical, by limit amplitude by Touch actuated switch is formed.
  • Centrifuges with shutdown devices of the type mentioned at the beginning are from DE 39 29 792 A1, DE 39 35 616 A1 and EP 0 082 956 A1 known. In these, the distance between the rotor and housing determined via a field strength determination, and it will switched off at a certain limit amplitude.
  • US Pat. No. 4,700,117 discloses the use of a Hall sensor for extraction a speed signal and for electronic derivation known from unbalance information.
  • the object of the present invention is a laboratory centrifuge of the type mentioned at the beginning to create the high permissible Manufacturing tolerances of the suspensions in all manufactured Copies allowed to reach the same at high speeds Limit unbalance enabled.
  • the centrifuge can Calibration operation with a given limit unbalance, for example by inserting a test weight into one of the tube holders.
  • the calibration device determines the one that occurs Amplitude, beneficial to reproducible conditions always manage at a certain low engine speed that is specified by the calibration device of the engine control.
  • the amplitude determined in calibration mode is called individual Limit amplitude of the respective centrifuge in the evaluation device saved and stands for the later operation of the centrifuge Evaluation device as a limit amplitude for its monitoring function to disposal.
  • This design of the calibration device enables two calibration test runs with different test weights, one of which is an unbalance below the limit unbalance and the other an unbalance generated above the limit unbalance. This ensures that when calibrating the centrifuge once with an imbalance in the safe Range and once with an imbalance in the tolerance range above the border imbalance is operated. This results in the Calibration company a statement that the centrifuge and its Evaluation device in the tolerance range of the limit unbalance works. A third calibration test run with a required Test weight that exactly produces the limit unbalance is used for this Training of the calibration device saved because of interpolation of the two calibration test runs carried out determines the limit amplitude is then stored in the evaluation device becomes.
  • the field generator which is generally of a simpler design, which, for example in the form of a permanent magnet, has no connections required, provided on the stator, while the field strength detector, of the connections to the evaluation device, on the housing side is provided where it is, for example, on a housing side anyway provided integrated electronics board can be. This reduces the manufacturing costs.
  • the invention is, 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. B. existing rubber blocks bearing 3 the stator 4th hold the centrifuge, which through the housing of a formed in the stator 4, Electric motor not shown in the figure becomes.
  • spring-elastic e.g. B. existing rubber blocks bearing 3 the stator 4th hold the centrifuge, which through the housing of a formed in the stator 4, Electric motor not shown in the figure becomes.
  • the electric motor in the stator 4 has a vertical arrangement aligned shaft 5 on which a rotor 6 is arranged, the has the usual outline shape for laboratory centrifuges. Inside, accessible through an upper opening are one of the usual ones Types of construction designed vessel holders provided.
  • An electronic device 7 is also arranged on the base plate 1, which has an externally accessible front panel 8 with Display 9 and keyboard 10.
  • the electronic device 7 has devices for speed control of the electric motor provided in the stator 4 and allowed by entering on the keyboard 10 with the display 9 Desired speed control of the centrifuge.
  • the electronic device 7 has a Hall detector on its upper side 11 on, for example on one provided there Electronics board can be integrated.
  • the Hall detector 11 is opposite the base plate 1 arranged fixed and with electric Connections with one provided in the electronics device 7 Evaluation device contacted.
  • a permanent magnet 13 is attached to the stator 4 via an arm 12, in a position near the Hall detector 11. Fine adjustments are not necessary. With assembly tolerances or piece tolerances of the bearings 3 resulting position deviations do not interfere, even with different distances the Hall detector 11 always that generated by the permanent magnet 13 Perceives magnetic field.
  • the Hall detector 11 sees a time constant field.
  • the centrifuge is started and started Imbalance on, so there are articulations of the stator 4 its mounting in the bearings 3. These displacements are at low speeds in the area of the resonance of the bearings especially large and can be evaluated well in this area.
  • the arm 12 makes movements with these articulations Components in the direction of the two double arrows shown in the figure are shown next to the arm 12. These movements of the arm lead to back and forth movements of the permanent magnet 13 over the Hall detector 11 and thus to change changes 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, pointing to any Way can be evaluated.
  • the Amplitudes of this signal as a measure of the unbalance evaluated.
  • a permanent memory e.g. one EEPROM
  • the value of a permissible limit amplitude is saved with which the evaluation device is constantly the currently compares the measured amplitude. If the limit amplitude is exceeded, so the evaluation device via the electronic device 7 and their devices controlling the engine to switch off of the engine.
  • the limit amplitude can be tested be determined for a centrifuge type and the electronic device 7 can be stored. With this mode of operation therefore always switched off at a certain deflection amplitude.
  • the electronic device 7 can be a calibration device included, for example, using the keyboard 10 a service code.
  • the calibration device is designed that, for example, on the display 9, the calibration operation requests for which a test weight of this size is inserted in the rotor 6 is that the rotor 6 is brought to unbalance.
  • the calibration device determines the amplitude that then occurs and stores it this in the permanent memory of the evaluation device for later Available from.
  • the calibration device is designed such that that it requests two calibration test runs, two with different ones Test weights are performed, one of which is an imbalance below and one creates an unbalance above the limit unbalance.
  • the calibration device determines that in both calibration test runs resulting amplitudes of the signal generated by the Hall detector 11 and stores an interpolation value calculated from it as the limit amplitude.
  • the arrangement of permanent magnet 13 and Hall detector 11 can be varied.
  • the two elements 11, 13 can but can also be arranged side by side, for example.
  • the cheapest arrangement to prove the deflections of the Stator 4 can be determined in experiments and depends, for example on the construction of the bracket for the stator. It is also possible, the Hall detector 11 on the arm 12 and the permanent magnet 13 fixed with respect to the housing, ie the base plate 1 to arrange.
  • the element 13 can be a static electrical one Generate field that is detected by element 11.
  • the Elements 11 and 13 can thus, for example, in the manner of a electrical capacitor act. It is also possible to use electromagnetic Alternating fields, such as light, to use.
  • One of the two elements 11, 13 can be used as a light source and the other be designed as a photosensitive element.

Landscapes

  • Centrifugal Separators (AREA)
  • Testing Of Balance (AREA)
EP94115988A 1993-10-15 1994-10-11 Laborzentrifuge mit Unwuchtabschaltung Expired - Lifetime EP0648541B1 (de)

Applications Claiming Priority (2)

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

Publications (3)

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

Family

ID=6500178

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94115988A Expired - Lifetime EP0648541B1 (de) 1993-10-15 1994-10-11 Laborzentrifuge mit Unwuchtabschaltung

Country Status (5)

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

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

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE216868C (ja) *
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
GB950982A (en) * 1960-03-17 1964-03-04 Reactor Centrum Nederland Devices in ultracentrifuges for detecting movements of the rotor
US3676723A (en) * 1970-03-02 1972-07-11 Bio Consultants Inc High speed centrifuge drive assembly
JPS539570U (ja) * 1976-07-09 1978-01-26
US4214179A (en) * 1979-03-15 1980-07-22 Beckman Instruments, Inc. Rotor imbalance detector for a centrifuge
ATE17928T1 (de) * 1981-12-24 1986-02-15 Kontron Holding Ag Einrichtung zur beruehrungslosen unwuchtmessung.
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
US4700117A (en) * 1985-05-31 1987-10-13 Beckman Instruments, Inc. Centrifuge overspeed protection and imbalance detection system
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
DE3935616C3 (de) * 1989-10-26 1998-12-24 Sigma Laborzentrifugen Gmbh Vorrichtung zur Überwachung des Betriebes einer Zentrifuge

Also Published As

Publication number Publication date
US5496254A (en) 1996-03-05
EP0648541A2 (de) 1995-04-19
DE59409153D1 (de) 2000-03-30
DE4335119C2 (de) 1997-11-20
DE4335119A1 (de) 1995-04-20
JPH07275739A (ja) 1995-10-24
ATE189863T1 (de) 2000-03-15
JP3448113B2 (ja) 2003-09-16
EP0648541A3 (de) 1995-09-20

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