EP1196247A1 - Laboratory centrifuge, comprising refrigeration unit - Google Patents
Laboratory centrifuge, comprising refrigeration unitInfo
- 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
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
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19932721 | 1999-07-16 | ||
DE19932721A DE19932721C1 (en) | 1999-07-16 | 1999-07-16 | Laboratory centrifuge with cooling unit |
PCT/EP2000/005877 WO2001005516A1 (en) | 1999-07-16 | 2000-06-26 | Laboratory centrifuge, comprising refrigeration unit |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1196247A1 true EP1196247A1 (en) | 2002-04-17 |
EP1196247B1 EP1196247B1 (en) | 2003-04-23 |
Family
ID=7914623
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00942132A Expired - Lifetime EP1196247B1 (en) | 1999-07-16 | 2000-06-26 | Laboratory centrifuge, comprising refrigeration unit |
Country Status (5)
Country | Link |
---|---|
US (1) | US6866621B1 (en) |
EP (1) | EP1196247B1 (en) |
JP (1) | JP4365062B2 (en) |
DE (2) | DE19932721C1 (en) |
WO (1) | WO2001005516A1 (en) |
Families Citing this family (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19932721C1 (en) * | 1999-07-16 | 2001-01-18 | Eppendorf Geraetebau Netheler | Laboratory centrifuge with cooling unit |
FI118661B (en) | 2002-10-17 | 2008-01-31 | Vacon Oyj | Cooling arrangement in the drive |
DE102006027696B4 (en) * | 2006-06-14 | 2009-07-02 | Thermo Electron Led Gmbh | Method and device for positioning a rotor of a centrifuge |
US7555933B2 (en) * | 2006-08-01 | 2009-07-07 | Thermo Fisher Scientific Inc. | Method and software for detecting vacuum concentrator ends-of-runs |
JP4569778B2 (en) * | 2006-09-01 | 2010-10-27 | 日立工機株式会社 | Centrifuge |
EP2335830B2 (en) * | 2009-12-17 | 2020-11-11 | Eppendorf Ag | Laboratory centrifuge with compressor cooler |
JP5541118B2 (en) * | 2010-11-26 | 2014-07-09 | 日立工機株式会社 | centrifuge |
US9246432B2 (en) * | 2011-02-14 | 2016-01-26 | Beckman Coulter, Inc. | Regenerative braking safety system and method of use |
JP5861988B2 (en) * | 2011-04-15 | 2016-02-16 | 日立工機株式会社 | centrifuge |
JP5948971B2 (en) * | 2011-04-15 | 2016-07-06 | 日立工機株式会社 | centrifuge |
JP5854218B2 (en) * | 2012-01-24 | 2016-02-09 | 日立工機株式会社 | centrifuge |
DE102012002593A1 (en) | 2012-02-13 | 2013-08-14 | Eppendorf Ag | Centrifuge with compressor cooling device and method for controlling a compressor cooling device of a centrifuge |
DE202012001679U1 (en) * | 2012-02-20 | 2012-04-04 | Sigma Laborzentrifugen Gmbh | Starting device for the compressor of a refrigerated centrifuge |
CN103623942B (en) * | 2012-08-26 | 2015-09-16 | 上海市离心机械研究所有限公司 | The temperature-controlled process of horizontal screw centrifuge |
JP6056383B2 (en) * | 2012-10-31 | 2017-01-11 | 日立工機株式会社 | Centrifuge |
DE102014107294B4 (en) * | 2014-05-23 | 2017-02-09 | Andreas Hettich Gmbh & Co. Kg | centrifuge |
DE102014110467A1 (en) * | 2014-07-24 | 2016-01-28 | Andreas Hettich Gmbh & Co. Kg | centrifuge |
JP6910855B2 (en) * | 2017-06-05 | 2021-07-28 | 荏原冷熱システム株式会社 | Centrifugal chiller |
DE102017130785A1 (en) * | 2017-12-20 | 2019-06-27 | Eppendorf Ag | Tempered centrifuge |
CN111530644A (en) * | 2020-04-22 | 2020-08-14 | 珠海华硕医疗器械有限公司 | Air cooling temperature control structure for medical centrifuge |
Family Cites Families (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 (en) * | 1978-06-01 | 1983-03-24 | Heraeus-Christ Gmbh, 3360 Osterode | Circuit arrangement for braking a laboratory centrifuge |
DE3343516C2 (en) | 1983-12-01 | 1985-10-31 | Berthold Hermle Kg, 7209 Gosheim | Refrigerated centrifuge with interchangeable rotors |
JPH0683590B2 (en) | 1984-07-04 | 1994-10-19 | 株式会社東芝 | Air conditioner |
DD243650A1 (en) * | 1985-12-02 | 1987-03-11 | Medizin Labortechnik Veb K | METHOD FOR TEMPERATING THE ROTORS OF ULTRA CENTRIFUGES |
DD248968A1 (en) * | 1986-05-14 | 1987-08-26 | Kyffhaeuserhuette Maschf | POWER ELECTRONIC DRIVE FOR CENTRIFUGAL SAVERS |
DE4136514C2 (en) * | 1991-11-06 | 1994-08-18 | Heraeus Sepatech | Circuit arrangement for speed control of a three-phase induction motor serving as a centrifuge drive |
JP3687797B2 (en) * | 1994-03-09 | 2005-08-24 | 日立工機株式会社 | Control device for centrifuge motor |
US5431620A (en) * | 1994-07-07 | 1995-07-11 | Beckman Instruments, Inc. | Method and system for adjusting centrifuge operation parameters based upon windage |
US5509881A (en) * | 1994-07-07 | 1996-04-23 | Beckman Instruments, Inc. | Centrifuge rotor identification and refrigeration control system based on windage |
JP3509310B2 (en) * | 1995-07-07 | 2004-03-22 | 日立工機株式会社 | Control method of precooling operation of centrifuge |
FR2754055B1 (en) * | 1996-09-27 | 1998-12-18 | Jouan | DEVICE FOR DETERMINING THE RESISTANT TORQUE OF A ROTATING EQUIPMENT, SYSTEM FOR MONITORING AN ELECTRIC MOTOR AND SYSTEM FOR REGULATING PARAMETERS OF AN ASSOCIATED CENTRIFUGE |
JP3863285B2 (en) * | 1998-04-10 | 2006-12-27 | 株式会社久保田製作所 | Cooling centrifuge |
DE19932721C1 (en) * | 1999-07-16 | 2001-01-18 | Eppendorf Geraetebau Netheler | Laboratory centrifuge with cooling unit |
JP3879360B2 (en) * | 2000-03-17 | 2007-02-14 | 日立工機株式会社 | Centrifuge |
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 (en) * | 2002-07-31 | 2004-02-26 | Hitachi Koki Co Ltd | Rotator drive unit |
-
1999
- 1999-07-16 DE DE19932721A patent/DE19932721C1/en not_active Expired - Lifetime
-
2000
- 2000-06-26 EP EP00942132A patent/EP1196247B1/en not_active Expired - Lifetime
- 2000-06-26 DE DE50001890T patent/DE50001890D1/en not_active Expired - Lifetime
- 2000-06-26 JP JP2001510592A patent/JP4365062B2/en not_active Expired - Lifetime
- 2000-06-26 WO PCT/EP2000/005877 patent/WO2001005516A1/en active IP Right Grant
- 2000-06-26 US US10/031,468 patent/US6866621B1/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO0105516A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE50001890D1 (en) | 2003-05-28 |
JP4365062B2 (en) | 2009-11-18 |
DE19932721C1 (en) | 2001-01-18 |
JP2003504197A (en) | 2003-02-04 |
EP1196247B1 (en) | 2003-04-23 |
WO2001005516A1 (en) | 2001-01-25 |
US6866621B1 (en) | 2005-03-15 |
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