EP1196247A1 - Centrifugeuse de laboratoire a groupe frigorifique - Google Patents

Centrifugeuse de laboratoire a groupe frigorifique

Info

Publication number
EP1196247A1
EP1196247A1 EP00942132A EP00942132A EP1196247A1 EP 1196247 A1 EP1196247 A1 EP 1196247A1 EP 00942132 A EP00942132 A EP 00942132A EP 00942132 A EP00942132 A EP 00942132A EP 1196247 A1 EP1196247 A1 EP 1196247A1
Authority
EP
European Patent Office
Prior art keywords
centrifuge
motor
cooling
frequency
laboratory
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
EP00942132A
Other languages
German (de)
English (en)
Other versions
EP1196247B1 (fr
Inventor
Heiko Müller
Horst Kache
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.)
Eppendorf SE
Original Assignee
Eppendorf SE
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 Eppendorf SE filed Critical Eppendorf SE
Publication of EP1196247A1 publication Critical patent/EP1196247A1/fr
Application granted granted Critical
Publication of EP1196247B1 publication Critical patent/EP1196247B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B15/00—Other accessories for centrifuges
    • B04B15/02—Other accessories for centrifuges for cooling, heating, or heat insulating
    • 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
    • B04B9/10—Control of the drive; Speed regulating

Definitions

  • the invention relates to a laboratory centrifuge with an electric centrifuge motor.
  • Laboratory centrifuges are also known with a cooling unit driven by an electric motor.
  • the cooling motors are continuously provided in a simple design with constant speed, the cooling power being controlled by switching the motor on and off.
  • the object of the present invention is to construct a laboratory tool with a speed-controlled centrifuge motor and cooling unit in a structurally simpler and more cost-effective manner.
  • the cooling motor is speed-controlled with a frequency control.
  • the existing frequency converter only has to be supplemented by another inverter. Additional switching and control devices for the cooling motor are not required. This results in a significant structural simplification for the engine control, which is reflected in the costs. This is of crucial importance for laboratory centrifuges, since they can only be successfully marketed as small and inexpensive table-top units.
  • the control device controlling the frequency converter can control both inverters with the same frequency. However, this would have the disadvantage that the rotor speed and cooling capacity are driven up and down together.
  • the features of claim 2 are therefore advantageously provided. This makes it possible to control the rotor speed and the cooling capacity separately as required.
  • the back braking power is - at least partially - destroyed in the cooling motor drawing current from the DC voltage source, which works as a braking resistor. Additional braking resistors can be greatly reduced or can be omitted entirely, which further reduces the cost of the centrifuge.
  • the centrifuge has a rotor 2 which has internal receptacles (not shown) for the conventional centrifuging vessels in the usual way.
  • the rotor 2 is operated via a shaft 4 by a centrifugal motor 5, which is designed as a three-phase induction motor.
  • the centrifuge motor 5 is supplied via three lines 6 by a centrifuge inverter 7 of a frequency converter 20.
  • the centrifuge inverter 7 is connected with input lines to the positive line and the negative line of a DC voltage source 10.
  • the DC voltage source 10 has a conventional charging capacitor 11 between the plus line and the minus line and is fed by a line rectifier 12 which is connected to line AC voltage via lines
  • the centrifuge inverter 7 is connected to a frequency controller 15 via control lines. This specifies the frequency and the voltage with which the centrifuge motor 5 is to be controlled to the centrifuge inverter 7.
  • a cooling unit 17 which, in the highly schematic illustration, cools the rotor 2 with a cooler 18 designed as a Roman coil cooler, and dissipates the heat outside the housing (not shown) with a heat exchanger 19 likewise designed as a coil cooler.
  • the cooling circuit is supplied by a compressor, not shown, which is driven by an electric cooling motor 22 via a shaft 21.
  • the cooling motor 22 is also designed as an induction motor and is supplied by a cooling inverter 24 via three lines 23. This is connected in the frequency converter 20 via input lines to the positive line and the negative line of the DC voltage source 10, that is to say in parallel to the centrifuge inverter 7. It is controlled via control lines by a frequency control 28 in a manner similar to that of the centrifuge inverter 7.
  • the cooling capacity of the cooling unit 17 and the speed of the rotor 2 can be set completely separately via corresponding specifications.
  • a control device 30 is used, which is connected to the frequency controls 15 and 28 via corresponding data lines in order to predefine the rotational speeds to be set.
  • the control device 30 can reduce the power to the cooling motor 22 by reducing the control frequency, or switch it off completely, in particular when the centrifuge motor 5 is at full load while the rotor 2 is operating. Overloading of the DC voltage source 10 is thus avoided and this can. e.g. with regard to the charging capacitor 11 and the line rectifier 2, as well as with respect to the size and the manufacturing costs.
  • the control device 30 can be designed such that when the centrifuge is switched on, the cooling unit 17 is first switched off and the rotor 2 rotates up to the range of its predetermined target speed. In addition, the power consumption of the centrifuge motor 5 drops and the power can now be increased to the cooling motor 22, which can reduce the power again via temperature sensors (not shown) connected to the control device 30 after the desired temperature has been reached. After completing the centrifugation process, rapid braking of the rotor 2 is desired in order to be able to quickly unload the stationary rotor 2. For this purpose, the control device 30 is designed such that it drives the frequency of the centrifuge inverter 7 to brake the centrifuge DC voltage source 10. With strong braking, the DC voltage source 10 can be overloaded while the voltage rises
  • the control device 30 ensures that when the centrifuge motor 5 is braked, the Kuhl grill ⁇ chtei 24 is driven at a defined frequency, so that the Kuhlmotoi 22 draws current from the DC voltage source 10.
  • the cooling motor 22 then acts as a braking resistor, so that additional braking resistors can be saved
  • the control unit 30 is also designed in such a way that it operates the cooling alternating egg 24 only above a minimum frequency, corresponding to a minimum drawing number of the cooling motor 22. In this way, the cooling compresses provided in the cow unit 17 are operated only above a minimum drawing number operated so that lubrication rangebioblems occurring at lower speeds are avoided

Landscapes

  • Centrifugal Separators (AREA)

Abstract

L'invention concerne une centrifugeuse de laboratoire pourvue d'un rotor (2) commandé par un moteur électrique de centrifugeuse (5) et d'un groupe frigorifique (17) commandé par un moteur électrique de refroidissement (22). Le moteur de centrifugeuse, réalisé sous forme de moteur à induction commandé par fréquence, est alimenté par un convertisseur de fréquence (20) commandé par un dispositif de commande (30) et présentant un onduleur de centrifugeuse (7) qui alimente le moteur de centrifugeuse et est raccordé à une source de tension continue (10) alimentée par un redresseur de secteur (12). La centrifugeuse de laboratoire selon l'invention est caractérisée en ce que le moteur de refroidissement est réalisé sous forme de moteur à induction commandé par fréquence et en ce que le convertisseur de fréquence comprend un autre onduleur de refroidissement (24) raccordé à la source de tension continue parallèlement à l'onduleur de centrifugeuse et alimentant le moteur de refroidissement.
EP00942132A 1999-07-16 2000-06-26 Centrifugeuse de laboratoire a groupe frigorifique Expired - Lifetime EP1196247B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19932721 1999-07-16
DE19932721A DE19932721C1 (de) 1999-07-16 1999-07-16 Laborzentrifuge mit Kühlaggregat
PCT/EP2000/005877 WO2001005516A1 (fr) 1999-07-16 2000-06-26 Centrifugeuse de laboratoire a groupe frigorifique

Publications (2)

Publication Number Publication Date
EP1196247A1 true EP1196247A1 (fr) 2002-04-17
EP1196247B1 EP1196247B1 (fr) 2003-04-23

Family

ID=7914623

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00942132A Expired - Lifetime EP1196247B1 (fr) 1999-07-16 2000-06-26 Centrifugeuse de laboratoire a groupe frigorifique

Country Status (5)

Country Link
US (1) US6866621B1 (fr)
EP (1) EP1196247B1 (fr)
JP (1) JP4365062B2 (fr)
DE (2) DE19932721C1 (fr)
WO (1) WO2001005516A1 (fr)

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19932721C1 (de) * 1999-07-16 2001-01-18 Eppendorf Geraetebau Netheler Laborzentrifuge mit Kühlaggregat
FI118661B (fi) 2002-10-17 2008-01-31 Vacon Oyj Jäähdytysjärjestely taajuusmuuttajassa
DE102006027696B4 (de) * 2006-06-14 2009-07-02 Thermo Electron Led Gmbh Verfahren und Vorrichtung zum Positionieren eines Rotors einer Zentrifuge
US7555933B2 (en) * 2006-08-01 2009-07-07 Thermo Fisher Scientific Inc. Method and software for detecting vacuum concentrator ends-of-runs
JP4569778B2 (ja) * 2006-09-01 2010-10-27 日立工機株式会社 遠心機
EP2335830B2 (fr) † 2009-12-17 2020-11-11 Eppendorf Ag Centrifugeuse de laboratoire dotée d'un refroidissement par compresseur
JP5541118B2 (ja) * 2010-11-26 2014-07-09 日立工機株式会社 遠心分離機
US9246432B2 (en) * 2011-02-14 2016-01-26 Beckman Coulter, Inc. Regenerative braking safety system and method of use
JP5861988B2 (ja) * 2011-04-15 2016-02-16 日立工機株式会社 遠心分離機
JP5948971B2 (ja) * 2011-04-15 2016-07-06 日立工機株式会社 遠心分離機
JP5854218B2 (ja) * 2012-01-24 2016-02-09 日立工機株式会社 遠心分離機
DE102012002593A1 (de) 2012-02-13 2013-08-14 Eppendorf Ag Zentrifuge mit Kompressorkühleinrichtung und Verfahren zur Steuerung einer Kompressorkühleinrichtung einer Zentrifuge
DE202012001679U1 (de) * 2012-02-20 2012-04-04 Sigma Laborzentrifugen Gmbh Anlaufgerät für den Kompressor einer Kühlzentrifuge
CN103623942B (zh) * 2012-08-26 2015-09-16 上海市离心机械研究所有限公司 卧螺离心机的温度控制方法
JP6056383B2 (ja) * 2012-10-31 2017-01-11 日立工機株式会社 遠心機
DE102014107294B4 (de) * 2014-05-23 2017-02-09 Andreas Hettich Gmbh & Co. Kg Zentrifuge
DE102014110467A1 (de) * 2014-07-24 2016-01-28 Andreas Hettich Gmbh & Co. Kg Zentrifuge
JP6910855B2 (ja) * 2017-06-05 2021-07-28 荏原冷熱システム株式会社 ターボ冷凍機
DE102017130785A1 (de) * 2017-12-20 2019-06-27 Eppendorf Ag Temperierte Zentrifuge
CN111530644A (zh) * 2020-04-22 2020-08-14 珠海华硕医疗器械有限公司 用于医用离心机的风冷控温结构

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US3246688A (en) * 1962-06-28 1966-04-19 Beckman Instruments Inc Controlled temperature apparatus
GB1007479A (en) * 1963-01-15 1965-10-13 Mse Holdings Ltd Improvements in or relating to centrifuges
US3409212A (en) * 1966-07-14 1968-11-05 Beckman Instrumetns Inc Apparatus for controllling centrifuge rotor temperature
DE2824045C2 (de) * 1978-06-01 1983-03-24 Heraeus-Christ Gmbh, 3360 Osterode Schaltungsanordnung zum Bremsen einer Laborzentrifuge
DE3343516C2 (de) 1983-12-01 1985-10-31 Berthold Hermle Kg, 7209 Gosheim Kühlzentrifuge mit auswechselbaren Rotoren
JPH0683590B2 (ja) 1984-07-04 1994-10-19 株式会社東芝 空気調和機
DD243650A1 (de) * 1985-12-02 1987-03-11 Medizin Labortechnik Veb K Verfahren zur temperierung der rotoren von ultrazentrifugen
DD248968A1 (de) 1986-05-14 1987-08-26 Kyffhaeuserhuette Maschf Leistungselektronischer antrieb fuer zentrifugalseparatoren
DE4136514C2 (de) * 1991-11-06 1994-08-18 Heraeus Sepatech Schaltungsanordnung zur Drehzahlsteuerung eines als Zentrifugenantrieb dienenden dreiphasigen Induktionsmotors
JP3687797B2 (ja) * 1994-03-09 2005-08-24 日立工機株式会社 遠心機用モータの制御装置
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US5509881A (en) * 1994-07-07 1996-04-23 Beckman Instruments, Inc. Centrifuge rotor identification and refrigeration control system based on windage
JP3509310B2 (ja) * 1995-07-07 2004-03-22 日立工機株式会社 遠心機の予冷運転制御方法
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JP3863285B2 (ja) * 1998-04-10 2006-12-27 株式会社久保田製作所 冷却遠心分離機
DE19932721C1 (de) * 1999-07-16 2001-01-18 Eppendorf Geraetebau Netheler Laborzentrifuge mit Kühlaggregat
JP3879360B2 (ja) * 2000-03-17 2007-02-14 日立工機株式会社 遠心機
US20020092802A1 (en) * 2000-07-17 2002-07-18 Evana Robert R. Power factor correction for centrifuges
US6635007B2 (en) * 2000-07-17 2003-10-21 Thermo Iec, Inc. Method and apparatus for detecting and controlling imbalance conditions in a centrifuge system
JP2004064945A (ja) * 2002-07-31 2004-02-26 Hitachi Koki Co Ltd 回転体駆動装置

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Also Published As

Publication number Publication date
DE50001890D1 (de) 2003-05-28
DE19932721C1 (de) 2001-01-18
JP4365062B2 (ja) 2009-11-18
EP1196247B1 (fr) 2003-04-23
WO2001005516A1 (fr) 2001-01-25
JP2003504197A (ja) 2003-02-04
US6866621B1 (en) 2005-03-15

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