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EP3807011B1 - Centrifugeuse thermorégulée pourvue d'une protection contre les pannes - Google Patents

Centrifugeuse thermorégulée pourvue d'une protection contre les pannes Download PDF

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Publication number
EP3807011B1
EP3807011B1 EP19731248.1A EP19731248A EP3807011B1 EP 3807011 B1 EP3807011 B1 EP 3807011B1 EP 19731248 A EP19731248 A EP 19731248A EP 3807011 B1 EP3807011 B1 EP 3807011B1
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EP
European Patent Office
Prior art keywords
centrifuge
temperature
pressure
evaporator
fan
Prior art date
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Application number
EP19731248.1A
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German (de)
English (en)
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EP3807011A1 (fr
Inventor
Andreas Keil
Heiko Müller
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Eppendorf SE
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Eppendorf SE
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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
    • B04B7/06—Safety devices ; Regulating
    • 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
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B39/00—Evaporators; Condensers
    • F25B39/02—Evaporators
    • 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
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/21—Refrigerant outlet evaporator temperature

Definitions

  • the present invention relates to a centrifuge according to the preamble of claim 7 and a method for preventing ignition of combustible tempering media according to the preamble of claim 1.
  • Centrifuge rotors are used in centrifuges, especially laboratory centrifuges, to separate the components of samples centrifuged therein by utilizing mass inertia. Increasingly higher rotation speeds are used to achieve high demixing rates.
  • Laboratory centrifuges are centrifuges whose rotors preferably operate at at least 3,000, preferably at least 10,000, in particular at least 15,000 revolutions per minute and are usually placed on tables. In order to be able to place them on a work table, they have a form factor of less than 1 m ⁇ 1 m ⁇ 1 m, so their installation space is limited.
  • the device depth is preferably limited to a maximum of 70 cm.
  • centrifuges are used in the fields of medicine, pharmacy, biology and chemistry.
  • the samples to be centrifuged are stored in sample containers and these sample containers are rotated using a centrifuge rotor.
  • the centrifuge rotors are usually set in rotation by a vertical drive shaft that is driven by an electric motor.
  • the sample containers can contain the samples directly or the sample containers can have their own sample containers that contain the sample, so that a large number of samples can be centrifuged simultaneously in one sample container.
  • centrifuge rotors are known in the form of fixed-angle rotors and swing-out rotors and others.
  • samples are centrifuged at certain temperatures.
  • samples containing proteins and similar organic substances must not be overheated, so the upper limit for the temperature of such samples is in the range of +40°C by default.
  • certain samples are cooled by default in the range of +4°C (the anomaly of water starts at 3.98°C).
  • active and passive systems can be used for temperature control.
  • Passive systems are based on air-assisted ventilation. This air is passed directly past the centrifuge rotor, which results in temperature control. The air is sucked into the centrifuge bowl through openings and the warmed air is discharged through further openings at another point in the centrifuge bowl, with the suction and discharge taking place automatically through the rotation of the centrifuge rotor.
  • Active cooling systems have a coolant circuit that regulates the temperature of the centrifuge container, which indirectly cools the centrifuge rotor and the sample containers contained therein.
  • Many different media are used as cooling or tempering media in compressor-operated cooling systems. Since in principle not only cooling, i.e. heat extraction, but also targeted heat supply can be desired during centrifugation, the present invention refers to tempering and tempering media.
  • tempering media commonly used for centrifuges, such as chlorodifluoromethane, tetrafluoroethane, pentafluoroethane or difluoromethane and many others, there are also flammable tempering media, such as butane or propane or various synthetic mixtures.
  • these flammable tempering media have very good heat transfer properties, they are generally not used for safety reasons, since the tempering medium can leak out and ignite in the event of a centrifuge rotor crash. In such a crash, fragments of the centrifuge rotor can at high speed and therefore with very high energy within the centrifuge and thereby also destroy the evaporator and the lines that carry the tempering medium. The escaping flammable tempering medium can then easily be ignited by the energy released during the crash and by electrical or electronic components inside the centrifuge or in its surroundings, which can cause very great damage, especially personal injury.
  • the EN 10 2012 002 593 A1 relates to an invention that deals with the use of electronic injection valves.
  • Fig.1 reference is made to a solution according to the state of the art in which a thermostatic injection valve is used that reacts to a pressure sensor after the evaporator outlet.
  • the thermostatic injection valve should open when superheating is reached.
  • This document does show a pressure determination at the evaporator outlet, whereby a maximum pressure (superheating pressure) is determined and the thermostatic injection valve is then switched, but this document does not deal with flammable refrigerants or with preventing the ignition of these refrigerants.
  • the pressure is below a minimum pressure, it can be assumed that there is either a leak or a crash, although a leak in the evaporator is very unlikely but could still lead to a gradual release of flammable tempering medium and a crash to a sudden release of flammable tempering medium. If the pressure is above a maximum pressure, there is a risk that there is a lot of flammable tempering medium in the evaporator, which could leak out and be ignited in the event of a crash.
  • the method according to the invention for preventing ignition of flammable tempering media in centrifuges, in particular after a crash of the centrifuge rotor wherein the centrifuge, which is designed in particular as a laboratory centrifuge, has a centrifuge container in which a centrifuge rotor can be accommodated, a centrifuge motor for driving the centrifuge rotor, tempering means with an evaporator and a compressor for tempering the centrifuge rotor and a housing in which the centrifuge container, the centrifuge rotor, the tempering means and the centrifuge motor are accommodated, wherein the tempering means have a flammable tempering medium which is guided in a tempering medium line, wherein the pressure in the evaporator is monitored to determine whether it is below a predetermined minimum pressure and/or above a predetermined maximum pressure, is characterized in that a fan of the centrifuge is started after an electrical power supply to the centrifuge is switched on and the fan has a The temperature control medium line is at
  • the pressure at the outlet of the evaporator is determined, preferably using a pressure sensor, in particular in the form of a pressure transmitter. This makes it particularly easy to monitor the pressure and to take control measures directly.
  • the predetermined minimum pressure is at least 0.7 bar, preferably at least 1 bar and in particular at least 1.3 bar.
  • the predetermined maximum pressure is at most 5 bar, preferably at most 3 bar, in particular at most 2 bar.
  • R290 propane is used as the temperature control medium.
  • isobutane, propene, butene, etc. can also be used.
  • R290 propane is preferred due to its advantageous parameters (pressure ranges, temperature profiles, boiling point, enthalpies and volumetric efficiency).
  • the pressure range depends directly on the temperature control medium used and the intended use (e.g. deep freezing or normal cooling); it has been shown with R290 propane that the above-mentioned pressure range is advantageous.
  • tempering medium to the evaporator If the supply of tempering medium to the evaporator is interrupted, only the tempering medium already in the evaporator can be ignited, which effectively limits the ignitable quantity.
  • Explosion-proof components are those according to the ATEX Directive of the European Union (ATEX Product Directive 2014/34/EU and the ATEX Operating Directive 1999/92/EC), or elements that have a power consumption of less than 20 W.
  • the centrifuge motor is designed to be explosion-proof in order to fundamentally prevent ignitions caused by the centrifuge motor.
  • the tempering medium circuit contains a quantity of tempering medium of less than 150 g, preferably less than 140 g, particularly preferably less than 130 g, in particular less than 120 g.
  • the tempering medium circuit contains a quantity of tempering medium of more than 30 g, preferably more than 40 g, particularly preferably more than 50 g.
  • the quantity is advantageously in the range 60 g to 110 g, but the other specified quantities can also be used for this range.
  • centrifuge motor If the centrifuge motor is stopped, a crash that has not yet occurred is prevented or the extent of a crash that has already occurred is reduced. It is also advantageous to switch off the centrifuge motor if the centrifuge motor is explosion-proof, because this provides mechanical crash protection.
  • the tempering medium is dispersed to such an extent that ignition is made more difficult.
  • Such an electrical fallback level could be implemented, for example, by means of at least one relay that is constantly energized during normal operation. If, in the event of a crash, the If there is no power to pull in or if a deliberate changeover occurs, the relay then establishes a contact between the residual electrical energy (for example from capacitors and the like) and the fan.
  • capacitors could be capacitors provided as standard in the electronics of the laboratory centrifuge. Special capacitors or accumulators could also be used that only exist to be charged during normal operation and to supply energy to the fan on request. For example, the request in the event of a crash could be made by the aforementioned relay or the like.
  • the amount of tempering medium in the evaporator is reduced if the evaporator pressure exceeds the specified maximum pressure. This provides for a possible crash by keeping the ignitable amount as low as possible from the outset.
  • the ignitable quantity is kept as low as possible.
  • tempering medium is sucked out of the evaporator so that the flammable amount is kept as low as possible.
  • tempering medium is fed into a tempering medium reservoir, the amount of flammable tempering medium in the evaporator is also reduced. This can be done, for example, by closing a valve in the tempering medium circuit so that no tempering medium can flow into the evaporator.
  • the compressor then pumps the tempering medium down to the minimum pressure and automatically feeds it into the opened tempering medium reservoir.
  • the tempering medium is then removed again from the tempering medium reservoir. simply by opening the valve in the line. During normal operation the valve remains open.
  • the supply of tempering medium to the evaporator is preferably interrupted.
  • a fan of the centrifuge is started after the electrical power supply of the centrifuge is switched on. This disperses any temperature control medium that may leak out in advance in such a way that a possible ignition is prevented.
  • This method requires independent protection regardless of whether the pressure in the evaporator is monitored or not.
  • This or the previously mentioned fan which serves to disperse any escaping temperature control medium, can be a specially designed fan, but it can also be a fan for cooling the centrifuge's electronics or a fan for operating the centrifuge's condenser.
  • the fan should preferably be designed so that it flows over the temperature control medium line at least in some areas and/or flows through at least one, in particular several cavities in the centrifuge in such a way that the resulting exhaust air is transported out of the centrifuge housing. These are preferably cavities that can fill up with escaping temperature control medium.
  • the fan is operated in such a way that no explosion-critical tempering medium-air mixture is formed, preferably no tempering medium-air mixture with a tempering medium content of 2 to 9 vol.% is formed.
  • the centrifuge in particular a laboratory centrifuge, with a centrifuge container in which a centrifuge rotor can be accommodated, a centrifuge motor for driving the centrifuge rotor, tempering means with an evaporator and a compressor for tempering the centrifuge rotor and a housing in which the centrifuge container, the centrifuge rotor, the tempering means and the centrifuge motor are accommodated, wherein the tempering means comprise a combustible tempering medium which is guided in a tempering medium line, wherein the centrifuge is adapted to determine whether the pressure in the evaporator is below a predetermined minimum pressure and/or above a predetermined maximum pressure, which is characterized in that the centrifuge is designed to start a fan of the centrifuge after an electrical power supply to the centrifuge is switched on, wherein the fan is set up such that it flows over a tempering medium line at least in regions and/or flows through at least one, in particular several
  • the centrifuge is adapted to carry out the method according to the invention.
  • At least one of the elements - electrical supply line to a non-Ex-protected component, switch in the electrical supply line to a non-Ex-protected component and control of the centrifuge - is arranged in the crash area of the centrifuge.
  • the power supply to the non-Ex-protected components is then deliberately interrupted, thus preventing ignition.
  • "Crash area” in this context means the area around the centrifuge container. If crash protection in the form of one or more stiffening elements or crash energy absorber elements is present in the centrifuge, then these elements should be arranged between the centrifuge container and the stiffening elements or crash energy absorber elements. For this design of the centrifuge, independent protection is claimed regardless of whether or not a sensor for monitoring the pressure in the evaporator is present.
  • a solenoid valve is arranged in front of the inlet of the evaporator, whereby the solenoid valve is preferably arranged in front of the pressure relief element.
  • a solenoid valve which is always kept open by the electrical supply of the centrifuge, closes automatically under spring force if the electrical supply is interrupted, as is to be expected in the event of a crash. For safety reasons, the pressure monitoring can be switched off in the event of a pressure below the The solenoid valve closes automatically when the minimum pressure is reached. This prevents the tempering medium from flowing in and possibly igniting in the event of a crash.
  • electronic injection valves (normally closed) or pressure switching valves can be used.
  • a check valve is arranged after the outlet of the evaporator. This prevents the tempering medium from flowing back into the evaporator from the condenser via the compressor, which becomes leaky over time, in the event of a crash.
  • a check valve another solenoid valve could also be used.
  • At least one of the elements centrifuge motor, electrical main switch, fan, pressure monitoring control and pressure monitoring sensor is explosion-proof and/or designed to consume less than 20 W of electrical power. This means that these elements can be operated continuously and carry out the monitoring or ignition protection measures without being able to contribute to an ignition.
  • the centrifuge has a gas sensor outside the temperature control medium, whereby leaks can be detected independently of a pressure drop below the minimum pressure in order to prevent the centrifuge from starting.
  • the centrifuge is designed to supply a fan with residual electrical energy present in the centrifuge after the electrical power supply fails, wherein there is preferably a relay that is fed by the electrical power supply and connects at least one element with residual electrical energy to the fan in the event of a failure of the electrical power supply, wherein the at least one element is in particular a capacitor.
  • the centrifuge 10 is designed as a laboratory centrifuge, which has a housing 12 with a lid 14 and an operating front 15.
  • a centrifuge rotor 20 is arranged on a drive shaft 17 of a centrifuge motor 18, which is designed as a swing-out rotor with centrifuge cups 22.
  • the centrifuge has tempering means 24 which comprise an evaporator 26, a compressor 28, a condenser 30 and a thermostatic injection valve 32, which are connected by a tempering media line 34.
  • the evaporator 26 is designed, for example, as a temperature control media line section that extends around the centrifuge container 16.
  • a solenoid valve 38 is arranged in the temperature control media line 34 between the condenser 30 and the evaporator 26 in the flow direction 36 upstream of the injection valve 32.
  • a check valve 40 blocking against the flow direction 36 is arranged in the temperature control media line 34.
  • a pressure sensor 44 in the form of a pressure transmitter is arranged at the outlet 42 of the evaporator 26, the signal 46 of which feeds a monitoring and control device 48.
  • the monitoring and control device 48 preferably has a processor (not shown) and controls the compressor 28 by means of a control line 50, a fan 54 associated with the condenser 30 by means of a control line 52, and the group 58 of the actual control system including the electrical and electronic components and the centrifuge motor 18 of the centrifuge 10 by means of a control line 56.
  • Group 60 of the components pressure sensor 44, monitoring and control device 48 and fan 54 is explosion-proof and/or designed to consume less than 20 W of electrical power, i.e. these components cannot under any circumstances ignite the temperature control medium in the temperature control medium 24.
  • R290 propane is preferably used as the temperature control medium.
  • the electrical power supply 62 of the centrifuge 10 has a conductive phase L and a neutral conductor N and is started by a main switch 64.
  • the main switch 64 connects the monitoring and control device 48 directly to the electrical power supply 62 via the line 66.
  • a line 68 that can be disconnected via a switch 70, which connects the fan 54 to the electrical power supply 62.
  • the switch 70 is switched by the monitoring and control device 48 via the connection 72, in such a way that after the centrifuge is started via the main switch 64, the fan 54 starts automatically at a low speed.
  • a line 74 which can be disconnected via a switch 76 and which connects the group 58 of the actual control, including the electrical and electronic components and the centrifuge motor 18 of the centrifuge 10, to the electrical power supply 62.
  • This switch 76 can also be switched by the monitoring and control device 48 via the connection 78.
  • lines 80, 82 which connect the compressor 28 and the solenoid valve 38 to the electrical power supply 62. These lines also have switches 84, 86 which can also be switched by the monitoring and control device 48 via the connections 88 and 90.
  • the switch 86 for the solenoid valve 38 is also supplied with electrical energy 92 by the controller 58 of the centrifuge 10, and is closed when such electrical energy 92 is applied to the controller 58.
  • group 60 of the components designed to be explosion-proof and/or consume less than 20 W of electrical power includes not only the pressure sensor 44, the monitoring and control device 48 and the fan 54, but also the main switch 64, the switch 70 in line 68 and the switch 76 in line 74.
  • the centrifuge 10 now functions as follows with regard to ignition protection: As soon as the main switch 64 is actuated, the monitoring and control device 48 is activated, which in turn closes the switch 70 so that the fan 54 of the condenser 30 is supplied so that it operates at a low speed of preferably at least 200 rpm. Even if tempering medium has already escaped due to a leak, this disperses it so that the formation of an ignitable mixture is prevented.
  • the switch 76 is closed so that the group 58 of the actual control, including the electrical and electronic components and the centrifuge motor 18 of the centrifuge 10, is supplied with electrical energy. Furthermore, the switches 84 and 86 are closed so that both the compressor 28 is operated and the solenoid valve 38 is closed. The compressor can now be operated by the control 58 as required.
  • the pressure sensor 44 detects a pressure in the evaporator 26 that is greater than the specified maximum pressure of 2 bar, there is a risk that there will be too much flammable tempering medium in the event of a crash.
  • the monitoring and control device 48 will then open the switch 86, causing the solenoid valve 38 to interrupt the supply of tempering medium to the evaporator 26.
  • the monitoring and control device 48 will increase the output of the compressor 28 (the corresponding direct control of the compressor 28 by the monitoring and control device 48 is not shown).
  • tempering medium is fed into a tempering medium reservoir (not shown).
  • a valve (not shown) arranged between the reservoir and the tempering medium line 34 is opened.
  • the monitoring and control device 48 opens the switch 86, whereby the solenoid valve 38 interrupts the supply of tempering medium to the evaporator 26.
  • the monitoring and control device 48 will open the switch 76, whereby all non-Ex-protected components of the centrifuge 10, such as the compressor 28 and the controller 58, are switched off, making ignition impossible.
  • the switch 70 is deliberately left open and residual electrical energy from capacitors in particular is delivered to the fan 54 in order to operate it to disperse the tempering medium.
  • Such an electrical fallback level could be implemented, for example, by means of at least one relay (not shown) that is constantly energized during normal operation. This relay is switched in a targeted manner by the monitoring and control device 48 so that contact is made between the residual electrical energy (for example from capacitors and the like) and the fan 54.
  • This relay is switched in a targeted manner by the monitoring and control device 48 so that contact is made between the residual electrical energy (for example from capacitors and the like) and the fan 54.
  • the centrifuge 10 can only be put into operation again after the main switch 64 has been opened and the monitoring and control device 48 determines that the pressure in the evaporator 28 is at least as high as the minimum pressure of 1.3 bar.
  • the control unit 58 and the lines 74, 82 are destroyed, so that all non-explosion-proof components, in particular the compressor 28, the control unit 58 and the centrifuge motor 18, are no longer supplied with energy and at the same time the solenoid valve 38 is closed, which prevents ignition.
  • the lines 74, 82 and in particular the switches 76, 86 and the control unit 58 are arranged in the crash zone for this purpose, i.e. preferably between the centrifuge container 16 and any crash protection in the form of one or more stiffening elements or crash energy absorber elements.
  • the present invention provides a centrifuge 10 with which even flammable tempering media can be used in the context of tempering without safety concerns, without these representing a safety risk in the event of a crash of the centrifuge rotor.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Centrifugal Separators (AREA)

Claims (12)

  1. Procédé destiné à empêcher un allumage de milieux de thermorégulation inflammables dans des centrifugeuses (10), dans lequel la centrifugeuse (10), qui est réalisée en particulier en tant que centrifugeuse de laboratoire, présente un récipient de centrifugeuse (16), dans lequel un rotor de centrifugeuse (20) peut être logé, un moteur de centrifugeuse (18) destiné à entraîner le rotor de centrifugeuse (20), des moyens de thermorégulation (24) avec un évaporateur (26) et un compresseur (28) pour thermoréguler le rotor de centrifugeuse (20) et un boîtier (12), dans lequel le récipient de centrifugeuse (16), le rotor de centrifugeuse (20), les moyens de thermorégulation (24) et le moteur de centrifugeuse (18) sont logés, dans lequel les moyens de thermorégulation (24) présentent un milieu de thermorégulation inflammable, qui est guidé dans une conduite de milieux de thermorégulation (34), dans lequel la pression dans l'évaporateur (26) est surveillée pour savoir si elle est inférieure à une pression minimale prédéfinie et/ou est supérieure à une pression maximale prédéfinie, caractérisé en ce qu'un ventilateur (54) de la centrifugeuse (10) est démarré après l'activation d'une alimentation en énergie électrique (62) de la centrifugeuse (10) et le ventilateur (54) submerge au moins par endroits une conduite de milieu de thermorégulation (34) de telle sorte et/ou traverse au moins une cavité dans la centrifugeuse (10) de telle sorte que l'air d'échappement se formant est acheminé hors du boîtier (12) de la centrifugeuse (10).
  2. Procédé selon la revendication 1, caractérisé en ce que la pression à la sortie (42) de l'évaporateur (26) est définie, dans lequel de manière préférée un capteur de pression, en particulier sous la forme d'un transmetteur de pression (44), est utilisé.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce
    que la pression minimale prédéfinie est d'au moins 0,7 bar, de manière préférée est d'au moins 1 bar et est en particulier d'au moins 1,3 bar, et/ou
    que la pression maximale prédéfinie est au maximum de 5 bar, de manière préférée au maximum de 3 bar, en particulier au maximum de 2 bar.
  4. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce
    qu'à une pression d'évaporateur inférieure à la pression minimale prédéfinie,
    a) l'amenée de milieu de thermorégulation vers l'évaporateur (26) est interrompue, et/ou
    b) le compresseur (28) est désactivé, et/ou
    c) l'alimentation en énergie électrique (62) des éléments électriques (58) de la centrifugeuse (10), qui pourraient entraîner une explosion et ne sont pas réalisés de manière protégée contre les explosions ou de manière à absorber une puissance électrique inférieure à 20 W, est arrêtée, et/ou
    d) le moteur de centrifugeuse (18) est désactivé, et/ou
    e) de l'énergie électrique résiduelle est acheminée de manière ciblée à un ventilateur (54) pour son fonctionnement.
  5. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce qu'à une pression d'évaporateur supérieure à la pression maximale prédéfinie, la quantité de milieu de thermorégulation dans l'évaporateur (26) est réduite, dans lequel de manière préférée
    f) l'amenée de milieu de thermorégulation vers l'évaporateur (26) est interrompue, et/ou
    g) la puissance du compresseur (28) est augmentée et/ou
    h) le milieu de thermorégulation est acheminé dans un système de stockage de milieux de thermorégulation.
  6. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce qu'un ventilateur (54) de la centrifugeuse est démarré après l'activation d'une alimentation en énergie électrique (62) de la centrifugeuse (10).
  7. Centrifugeuse (10), en particulier centrifugeuse de laboratoire, avec un récipient de centrifugeuse (16), dans lequel un rotor de centrifugeuse (20) peut être logé, un moteur de centrifugeuse (18) destiné à entraîner le rotor de centrifugeuse (20), des moyens de thermorégulation (24) avec un évaporateur (26) et un compresseur (28) pour thermoréguler le rotor de centrifugeuse (20) et un boîtier (12), dans lequel le récipient de centrifugeuse (16), le rotor de centrifugeuse (20), les moyens de thermorégulation (24) et le moteur de centrifugeuse (18) sont logés, dans lequel les moyens de thermorégulation (24) présentent un milieu de thermorégulation inflammable, qui est guidé dans une conduite de milieux de thermorégulation (34), dans lequel la centrifugeuse (10) est adaptée pour constater si la pression dans l'évaporateur (26) est inférieure à une pression minimale prédéfinie et/ou est supérieure à une pression maximale prédéfinie, caractérisée en ce que la centrifugeuse (10) est réalisée pour démarrer un ventilateur (54) de la centrifugeuse (10) après l'activation d'une alimentation en énergie électrique (62) de la centrifugeuse (10), dans lequel le ventilateur (54) est mis au point de telle sorte qu'il submerge au moins par endroits une conduite de milieu de thermorégulation (34) de telle sorte et/ou traverse au moins une, en particulier plusieurs cavités dans la centrifugeuse (10) de telle sorte que l'air d'échappement se formant est acheminé hors du boîtier (12) de la centrifugeuse (10).
  8. Centrifugeuse (10) selon la revendication 7, caractérisée en ce
    que la centrifugeuse (10) est adaptée pour effectuer le procédé selon l'une quelconque des revendications 1 à 6, et/ou
    qu'au moins un des éléments, moteur de centrifugeuse (18), conduite d'amenée électrique (74, 82) vers une composante réalisée de manière non protégée contre les explosions ou de manière à absorber une puissance électrique inférieure à 20 W, des commutateurs (76, 86) dans une conduite d'amenée électrique vers une composante réalisée de manière non protégée contre les explosions et de manière à absorber une puissance électrique inférieure à 20 W et une commande (62) de la centrifugeuse (10), est disposé dans la zone d'impact de la centrifugeuse (10).
  9. Centrifugeuse (10) selon l'une quelconque des revendications 7 ou 8, caractérisée en ce que
    i) une soupape magnétique (38) est disposée devant l'entrée de l'évaporateur (26), dans laquelle la soupape magnétique (38) est disposée de manière préférée devant l'élément de détente de pression (32), et/ou que
    k) une soupape anti-retour (40) est disposée après la sortie (42) de l'évaporateur (26), et/ou que
    l) au moins un des éléments, commutateur principal électrique (64), ventilateur (54), commande de surveillance de pression (48) et capteur de surveillance de pression (44), est réalisé de manière protégée contre les explosions et/ou de manière à absorber une puissance électrique inférieure à 20 W.
  10. Centrifugeuse (10) selon l'une quelconque des revendications 7 à 9, caractérisée en ce que la centrifugeuse (10) est réalisée pour alimenter un ventilateur (54) en énergie électrique résiduelle présente dans la centrifugeuse (10) après la panne de l'alimentation en énergie électrique (62), dans laquelle il existe de manière préférée un relais, qui est alimenté par l'alimentation en énergie électrique (62) et qui, en cas de panne de l'alimentation en énergie électrique (62), relie au moins un élément avec une énergie électrique résiduelle au ventilateur (54), dans lequel l'au moins un élément est en particulier un condensateur ou un accumulateur.
  11. Centrifugeuse (10) selon l'une quelconque des revendications 7 à 10, caractérisée en ce que le ventilateur (54) est mis au point de telle sorte qu'il traverse plusieurs cavités dans la centrifugeuse (10) de telle sorte que l'air d'échappement en résultant est acheminé hors du boîtier (12) de la centrifugeuse (10).
  12. Centrifugeuse selon l'une quelconque des revendications 7 à 11, caractérisée en ce que la centrifugeuse présente un capteur de gaz à l'extérieur du moyen de thermorégulation et est mise au point de manière préférée pour empêcher un démarrage de la centrifugeuse lors de la détermination du milieu de thermorégulation par le capteur de gaz.
EP19731248.1A 2018-06-15 2019-06-13 Centrifugeuse thermorégulée pourvue d'une protection contre les pannes Active EP3807011B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018114450.4A DE102018114450A1 (de) 2018-06-15 2018-06-15 Temperierte Zentrifuge mit Crashschutz
PCT/EP2019/065614 WO2019238891A1 (fr) 2018-06-15 2019-06-13 Centrifugeuse thermorégulée pourvue d'une protection contre les pannes

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EP3807011A1 EP3807011A1 (fr) 2021-04-21
EP3807011B1 true EP3807011B1 (fr) 2024-09-11

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EP (1) EP3807011B1 (fr)
JP (1) JP7214759B2 (fr)
CN (1) CN112584934A (fr)
DE (1) DE102018114450A1 (fr)
WO (1) WO2019238891A1 (fr)

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DE102014107294B4 (de) * 2014-05-23 2017-02-09 Andreas Hettich Gmbh & Co. Kg Zentrifuge
DE102017130785A1 (de) * 2017-12-20 2019-06-27 Eppendorf Ag Temperierte Zentrifuge
CN111167616A (zh) * 2020-02-04 2020-05-19 张家港市蓝鸟机械有限公司 一种新型离心机
DE102021125446A1 (de) 2021-09-30 2023-03-30 Thermo Electron Led Gmbh Kühlsystem und Laborgerät mit Kühlsystem
EP4194096B1 (fr) * 2021-12-08 2024-03-06 Eppendorf SE Procédé de fonctionnement d'un appareil de laboratoire réfrigéré par un réfrigérant inflammable
USD1064311S1 (en) * 2023-05-14 2025-02-25 Dlab Scientific Co., Ltd. Centrifuge

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DE9304301U1 (de) * 1993-03-23 1993-06-03 Schütz, Peter, 4152 Kempen Kälteanlage
JP3733674B2 (ja) * 1997-01-30 2006-01-11 株式会社デンソー 空調装置
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DE102018114450A1 (de) 2019-12-19
JP2021527559A (ja) 2021-10-14
EP3807011A1 (fr) 2021-04-21
WO2019238891A1 (fr) 2019-12-19
CN112584934A (zh) 2021-03-30
US20210252526A1 (en) 2021-08-19

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