EP2600978A1 - Centrifuge having compressor cooling - Google Patents
Centrifuge having compressor coolingInfo
- Publication number
- EP2600978A1 EP2600978A1 EP12727315.9A EP12727315A EP2600978A1 EP 2600978 A1 EP2600978 A1 EP 2600978A1 EP 12727315 A EP12727315 A EP 12727315A EP 2600978 A1 EP2600978 A1 EP 2600978A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- centrifuge
- base plate
- iib
- iia
- cooling device
- 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
- B04B7/00—Elements of centrifuges
- B04B7/02—Casings; Lids
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D31/00—Other cooling or freezing apparatus
Definitions
- the present invention relates to a centrifuge, in particular a laboratory centrifuge, according to the preamble of claim 1 and a method for cooling a centrifuge according to the preamble of claim 12.
- the ambient air is passed directly through the centrifuge bowl at the centrifuge rotor, with the rotor acting as a kind of radial fan.
- the centrifuge lid and / or centrifuge bowl has an inlet opening near the axis and an outlet opening arranged at a distance from the axis of rotation.
- the centrifuge tank must have an outlet opening for it, which, however, also permits a material outlet.
- a disadvantage of the direct cooling results from the use of ambient air as a coolant: the sample can be cooled to a maximum of only the temperature of the ambient air.
- the rotor In indirect cooling, the rotor is enclosed in the centrifuge vessel under the centrifuge lid and no cooling channel or the like is provided. The air circulates therefore only within the centrifuge bowl. Cooling is now achieved by a second medium, which is passed on the outside of the boiler. This can either be ambient air, which is conducted past the outside of the boiler, as is realized, for example, in the case of the centrifuge 5424 from Eppendorf AG.
- the cooling device consists of a compressor cooling with tubes and heat exchangers which are arranged above the device-side base plate, wherein a special coolant via pipes, for example, spirally on the boiler, ie the side walls and the bottom of the boiler, abuts, is passed to the boiler to remove heat.
- a special coolant via pipes for example, spirally on the boiler, ie the side walls and the bottom of the boiler, abuts, is passed to the boiler to remove heat.
- An advantage of indirect cooling is the better controllability of the temperature to be set compared to
- the base plate of the centrifuge which is usually made of metal, is used in prior art centrifuges only for the passive removal of a portion of the heat from the interior of the housing.
- the object of the present invention is to further improve the active indirect cooling of centrifuges.
- the space requirement should be reduced, so that the centrifuges can be kept more compact at the same Zentrifugierkapaztician or centrifuging capacity can be increased with the same dimensions.
- a saving of components and thus a saving of costs and assembly time should be made possible in particular.
- the inventors have recognized that in modern centrifuges can be dispensed with a separate condenser or gas cooler for the cooling medium of the compressor cooling when the base plate itself is used as a heat exchanger for the coolant to dissipate the heat.
- the gas cooler heat is not dissipated by the condenser, but in a transcritical process, sensible heat is released from the hot gas.
- the condenser on the other hand, a phase transformation takes place via three processes: the defrosting of the hot gas, the liquefaction and the subcooling of the liquid refrigerant. From the basic structure as a component condenser and gas cooler are the same design and need to be designed according to the particular application. Therefore, in the following uniformly spoken of liquefier, although gas coolers are included.
- the base plate for passive cooling i. to dissipate the heat from the electronics of the centrifuge
- the cooling medium flowing from the compressor which may have a temperature of up to 120 ° C, depending on the ambient temperature to temperatures of about 35 ° C (at an ambient temperature of about 20 ° C) cooled.
- the base plate is in heat-conducting connection with the compressor cooling device such that the base plate forms a heat exchanger of the compressor cooling device and thus acts at least as part of a condenser for the cooling medium of the compressor cooling device.
- a conduit means for the coolant is provided on and / or in the base plate, wherein the conduit means is preferably formed as a tube.
- the base plate as a condenser structurally very simple design.
- the conduit means is cast into the base plate or that the base plate is constructed at least in two parts and the conduit means arranged in the parting plane between the two parts, in particular in at least one part is incorporated.
- the conduit means may be cast into the base plate, in particular using a copper tube which is cast into the aluminum base plate.
- a sandwich construction can take place, in which case a relatively high accuracy of fit has to be ensured in order to prevent leaks.
- an inserted pipeline can also be used in the sandwich construction in order to prevent leaks. Again, a high accuracy of fit is required so that an optimal heat transfer between the pipe and the sandwich parts of the base plate is guaranteed, otherwise obstructed air or the like heat transfer.
- a means for improving the heat transfer, for example a thermal compound, between the pipeline and sandwich parts of the base plate is preferably arranged.
- the base plate has at least one surface-enlarging element, in particular one or more cooling ribs, on at least one of the two major main surfaces. Then, the base plate can give off the heat of the coolant particularly well, because its surface is advantageously increased for cooling and optionally can be used in an active cooling of the base plate to reduce noise with a slow / low air flow.
- these cooling fins can also be used expediently for an airflow duct of active cooling. For these elements, no separate space must be provided, as due to the bearing plate between the base plate and boiler enough space is available and even below the base plate is such space available.
- the base plate has at least one opening which is not in fluid communication with the conduit means.
- passively or actively generated air flows can be very well steered, because such an air flow can now also pass through the base plate itself.
- such breakthroughs are used to selectively interrupt or reduce the thermal conductivity of the base plate, thereby separating the warm input from the cold outlet in the condenser and thus to increase its effectiveness.
- the ventilation means such as a fan, is in operative connection with the base plate and is preferably adapted to generate an air flow in the housing of the centrifuge, which enters the housing laterally and / or on the bottom side.
- an air-permeable cover of ventilation openings can be provided in the housing.
- this ventilation means is particularly effective in removing heat generated by the engine and drive electronics created in the boiler room by air resistance introduced by the samples to be centrifuged themselves or by centrifugation, and heat from outside, for example, penetrates through the lid in the centrifuge. This venting means thus provides significant support to the compressor cooling.
- the base plate is arranged on the housing of the centrifuge that the heat transfer between the base plate and the housing is interrupted or at least reduced.
- a heat-insulating connection is preferably arranged between the base plate and the housing of the centrifuge.
- Self-contained protection is claimed for the inventive method for cooling a centrifuge, in particular a laboratory centrifuge, wherein a compressor cooling device is provided, which is characterized in that a base plate of the centrifuge is used at least as part of a condenser of the compressor cooling device.
- a ventilation means which generates an air flow parallel to and / or ascending through the base plate. This creates a particularly effective active cooling of the base plate so that it acts particularly effectively as a condenser.
- the centrifuge according to the invention is particularly suitably used.
- Fig. 1 is a plan view of a centrifuge with condenser according to the prior
- FIG. 2 is an overall perspective view of the centrifuge of FIG. 1, a top view of the centrifuge according to the invention without housing components,
- FIG. 3 different overall perspective views of the centrifuge according to the invention according to FIG. 3,
- the base plate for the centrifuge according to the invention according to FIG. 3 in a second preferred embodiment as a sandwich base plate with the upper part in a perspective view from above,
- the base plate for the centrifuge according to the invention according to FIG. 3 in the second preferred embodiment as a sandwich base plate with the upper part in a perspective view from below,
- the base plate for the centrifuge according to the invention of FIG. 3 in the second preferred embodiment as a sandwich base plate with the lower part in a perspective view from above and the base plate for the centrifuge according to the invention of FIG. 3 in the second preferred embodiment in section.
- Fig. 1 is shown purely schematically in a partial plan view of a known from the prior art laboratory centrifuge 1, in addition to the electronics 2, the centrifuge vessel 3 and the underlying motor (not shown), the centrifuge rotor 4, the compressor 5 and the base plate 6 has a condenser 7. Between compressor 5 and condenser 7, a fan 8 for the condenser 7 is arranged. In Fig. 2, this known centrifuge 1 is shown in perspective together with the housing 9 and cover 9a.
- FIG. 3 the centrifuge 10 according to the invention is shown purely schematically in a preferred embodiment in the partial plan view.
- Fig. 4a, 4b the centrifuge 10 according to the invention is shown in different perspective views.
- the centrifuge 10 has a base plate 1 1 and a vessel 12 with centrifuge rotor 13, wherein on the base plate 1 1 below the boiler via its bearing plate of the centrifuge motor (bearing shield and centrifuge motor form in a manner known to those skilled in a unitary component and are not shown separately).
- the centrifuge 10 has a compressor cooling 14 with a coolant line 15 which is guided through the base plate 11.
- FIGS. 5 to 8 and FIGS. 9 to 13 two different preferred embodiments of the base plate I I a, I I b are shown in more detail.
- FIG. 5 to 8 is a base plate I I a, which is formed in two parts, wherein for the preparation of this base plate I Ia in the casting process, a pipe 22 has been poured into the base plate body 23.
- the pipe 22 is preferably made of copper while the base plate body 23 is preferably cast of aluminum.
- a base plate I Ib which is formed in several parts, wherein the base plate I Ia consists of an upper part 40 and a lower part 41. Both were manufactured using the casting process and have the formations 42, 43 for a pipeline. However, instead of cast parts 40, 41, these can also be produced by milling and the like. By screwing, gluing or welding or other means of connection of the two base plate parts 40, 41 results in an integrally formed base plate I Ib in which there is also material connection. In order to prevent the risk of leaks and the like, it is necessary to work very precisely here. Alternatively, a separate pipe between the plates can be inserted.
- a means for improving the heat transfer for example a thermal compound, is preferably provided between the parts of the base plate and the inserted pipeline. Also in this case, a very exact configuration of the formations and the tube is required to ensure good heat transfer between the pipe and the sub-plates of the base plate.
- ribs 46, 47 are also provided in the base plate I Ib .
- Fig. 13 is specifically seen that the upper part 40 is inserted into the lower part 41 and that the pipe 50 is located in the parting plane T.
- the ventilation slots 18 arranged in the base plate 1 1, II a, II b serve not only as openings for the passage of air but also for separating warmer and colder zones in the base plate 11, IIa, 11b, the warmer zone being the who is inside, while the colder zone at the edge of the base plate 1 1, II a, II b runs.
- Connection point 29 thus feeds the warmer zone and connection point 28 is used for removal from the colder zone.
- the base plate 1 1, I I a, I I b serves as a heat exchanger surface and thus acts for the guided through the coolant line 22, 50 coolant the compressor cooling 14 as condenser 51, 51 a, 51 b.
- the base plate 1 1, I I a, I I b takes on the heat of the coolant and gives it over their means of the ribs 32, 33, 46, 47 extended surface 30, 31, 44, 45 from. These ribs 32, 33, 46, 47 also generate in connection with the fan 17 an air flow, which dissipates the heat to the outside and thus the centrifuge 10 cools overall.
- the base plate 1 1, I I a, I Ib is arranged in the centrifuge 10 so that there is no direct thermal contact with the housing 19.
- the openings 18, 20, 21 are also covered with a gauze (not shown) or the like, so that fire protection requirements is satisfied.
- I I a, I I b ribs 32, 33, 46, 47 which are aligned parallel to each other, are basically also angular, i. 180 ° deviating arrangements to each other possible.
- two or more groups of ribs may be provided, wherein the ribs within the group are parallel to each other, but an angle exists between the groups.
- all ribs have an angle among each other. As a result, particularly advantageous air flows can be adjusted.
- the centrifuge 10 according to the invention has improved cooling to the extent that its space requirement is reduced, so that the centrifuge 10 can be kept more compact at the same Zentrifugierkapaztician or at the same Bauhoff Zentrifugierkapaztician can be increased.
- a saving of components is possible and thus a saving of costs and assembly time.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102011105878A DE102011105878A1 (en) | 2011-06-14 | 2011-06-14 | Centrifuge with compressor cooling |
PCT/EP2012/002435 WO2012171624A1 (en) | 2011-06-14 | 2012-06-08 | Centrifuge having compressor cooling |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2600978A1 true EP2600978A1 (en) | 2013-06-12 |
EP2600978B1 EP2600978B1 (en) | 2014-01-08 |
Family
ID=46275784
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12727315.9A Active EP2600978B1 (en) | 2011-06-14 | 2012-06-08 | Centrifuge having compressor cooling |
Country Status (6)
Country | Link |
---|---|
US (2) | US20130219926A1 (en) |
EP (1) | EP2600978B1 (en) |
JP (1) | JP5829333B2 (en) |
CN (1) | CN103153476B (en) |
DE (1) | DE102011105878A1 (en) |
WO (1) | WO2012171624A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
USD752769S1 (en) * | 2013-10-29 | 2016-03-29 | Hitachi Koki Co., Ltd. | Centrifuge |
CN104801433B (en) * | 2014-09-01 | 2018-04-06 | 长沙易达仪器有限公司 | A kind of high temperature centrifuge |
EP3015791A1 (en) * | 2014-10-29 | 2016-05-04 | Eppendorf Ag | Centrifuge with a compressor cooling circuit and method for operating a centrifuge with a compressor cooling circuit |
CN104588221A (en) * | 2014-12-30 | 2015-05-06 | 上海力申科学仪器有限公司 | Fast temperature regulating mechanism for centrifugal machine |
DE102018114450A1 (en) * | 2018-06-15 | 2019-12-19 | Eppendorf Ag | Temperature-controlled centrifuge with crash protection |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1018285A (en) * | 1963-10-17 | 1966-01-26 | Mse Holdings Ltd | Improvements in or relating to the temperature control of centrifuges |
DE2343070B2 (en) | 1973-08-25 | 1975-11-13 | Hanning Elektro-Werke Robert Hanning, 4800 Bielefeld | Centrifuge, especially ultracentrifuge |
DE29721563U1 (en) * | 1997-12-05 | 1999-01-14 | Sigma Laborzentrifugen Gmbh | Laboratory centrifuge |
US20030029189A1 (en) * | 2000-12-22 | 2003-02-13 | Mark Wilson | Refrigerator condenser system |
US7407473B2 (en) * | 2002-04-19 | 2008-08-05 | Thermo Fisher Scientific (Asheville) Llc | Centrifuge sleep mode control |
KR20030089819A (en) * | 2002-05-20 | 2003-11-28 | 엘지전자 주식회사 | Compressor base cover of refrigerator |
JP2006021121A (en) * | 2004-07-08 | 2006-01-26 | Hitachi Koki Co Ltd | Centrifugal separator |
CN101941554B (en) * | 2008-12-22 | 2014-08-06 | 埃佩多夫股份公司 | Container and device for indirect cooling of articles and method for manufacturing the same |
JP5077292B2 (en) * | 2009-05-29 | 2012-11-21 | 日立工機株式会社 | centrifuge |
-
2011
- 2011-06-14 DE DE102011105878A patent/DE102011105878A1/en not_active Withdrawn
-
2012
- 2012-06-08 WO PCT/EP2012/002435 patent/WO2012171624A1/en active Application Filing
- 2012-06-08 CN CN201280002867.XA patent/CN103153476B/en active Active
- 2012-06-08 EP EP12727315.9A patent/EP2600978B1/en active Active
- 2012-06-08 JP JP2014515083A patent/JP5829333B2/en active Active
-
2013
- 2013-04-07 US US13/858,060 patent/US20130219926A1/en not_active Abandoned
- 2013-06-11 US US13/915,296 patent/US8974361B2/en active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2012171624A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP2600978B1 (en) | 2014-01-08 |
US20130219926A1 (en) | 2013-08-29 |
WO2012171624A1 (en) | 2012-12-20 |
JP5829333B2 (en) | 2015-12-09 |
US8974361B2 (en) | 2015-03-10 |
CN103153476A (en) | 2013-06-12 |
JP2014522315A (en) | 2014-09-04 |
US20130298577A1 (en) | 2013-11-14 |
CN103153476B (en) | 2014-08-20 |
DE102011105878A1 (en) | 2012-12-20 |
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