EP2363665B1 - Appareil de réfrigération et/ou de congélation - Google Patents

Appareil de réfrigération et/ou de congélation Download PDF

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Publication number
EP2363665B1
EP2363665B1 EP11001639.1A EP11001639A EP2363665B1 EP 2363665 B1 EP2363665 B1 EP 2363665B1 EP 11001639 A EP11001639 A EP 11001639A EP 2363665 B1 EP2363665 B1 EP 2363665B1
Authority
EP
European Patent Office
Prior art keywords
evaporators
refrigerant
compartment
evaporator
refrigerator
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.)
Active
Application number
EP11001639.1A
Other languages
German (de)
English (en)
Other versions
EP2363665A2 (fr
EP2363665A3 (fr
Inventor
Lothar R. Oellrich
Karlheinz Schaber
Matthias Schenk
Thomas Ertel
Thomas Gindele
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.)
Liebherr Hausgeraete Ochsenhausen GmbH
Original Assignee
Liebherr Hausgeraete Ochsenhausen 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.)
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Publication date
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Publication of EP2363665A2 publication Critical patent/EP2363665A2/fr
Publication of EP2363665A3 publication Critical patent/EP2363665A3/fr
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Publication of EP2363665B1 publication Critical patent/EP2363665B1/fr
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Classifications

    • 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
    • F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
    • F25B5/02—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in parallel
    • 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
    • F25B2600/25—Control of valves
    • F25B2600/2511—Evaporator distribution valves

Definitions

  • the present invention relates to a refrigerator and / or freezer with at least one refrigerant circuit having two or more than two parallel connected evaporators, which preferably cool different compartments of the refrigerator and / or freezer, and with at least one compressor, by means of which the evaporator Refrigerants can be acted upon.
  • refrigerators and / or freezers are also known from the state of the art in which, at the same time, a plurality of evaporators connected in parallel is supplied with refrigerant.
  • the evaporators are usually valves, such as check valves or control valves or other components, such as refrigerant collector downstream, which are located in the one or more line sections between evaporator outlet and compressor inlet.
  • valves such as check valves or control valves or other components, such as refrigerant collector downstream, which are located in the one or more line sections between evaporator outlet and compressor inlet.
  • a refrigeration device is a refrigerant circuit, the two evaporators connected in parallel, a compressor, by means of which the refrigerant is conveyed to dne evaporators, wherein the evacuating lines of the refrigerant circuit communicate with each other and have no shut-off.
  • the refrigerant circuit comprises a magnetic control valve arranged in the flow direction of the refrigerant upstream of the evaporator, which is designed to distribute the refrigerant to the evaporator.
  • the WO 2008/120861 A1 discloses a method of controlling a refrigerator having a main body having a plurality of storage chambers; a plurality of evaporators installed to independently cool the plurality of storage chambers, respectively; and a refrigerant control valve for controlling the refrigerant introduced into the plurality of evaporators.
  • the present invention is therefore the object of developing a refrigerator and / or freezer of the type mentioned in such a way that it has a simple structure.
  • the device comprises at least one movable in a plurality of positions control device, which is arranged in the flow direction of the refrigerant upstream of the evaporator and designed such that it distributes the refrigerant to the evaporator, wherein the laxatives from the evaporators lines of the refrigerant circuit communicate with each other and have no shut-off.
  • the control device serves to distribute the refrigerant coming from the condenser to the evaporator.
  • shut-off downstream of the evaporator no shut-off, preferably no valves or the like are provided, but that the suction lines, ie the laxatives from the evaporators lines no Have shut-off means by which the refrigerant flow can be shut off or throttled. This results in a particularly simple and inexpensive construction of the device.
  • the refrigerant flow is distributed only to the evaporators by the upstream control means, whereas downstream of the evaporators no such control means is provided.
  • the lines discharging from the evaporators open into at least one common line, i. be merged to at least one common line, which preferably also has no shut-off.
  • this common line forms the suction line of the compressor.
  • Said control means may be constituted by at least one multi-way valve or by individual valves respectively arranged in the lines leading to the evaporators.
  • a conventional stop valve would be possible in each of the individual lines leading to the evaporators.
  • the control device can be designed such that in normal operation of the device in a first working position of the control device, each of the evaporators is individually supplied with refrigerant and / or in a second working position of the control means groups of evaporators are simultaneously supplied with refrigerant and / or in a third working position all evaporators are supplied with refrigerant at the same time.
  • At least one of the compartments is associated with a switch-off, which is the actual temperature of the compartment, in which the refrigerant supply to the evaporator associated with the compartment is suppressed.
  • the device has at least one control or regulating device, which is designed such that it the Ausschaltwert of the compartment increased if the actual temperature of the compartment after switching off the evaporator would otherwise fall below the temperature setpoint for this compartment.
  • the phenomenon of "re-evaporation" can occur. For example, if two evaporators are simultaneously pressurized with refrigerant and an evaporator is turned off (i.e., its refrigerant supply is suppressed), when the compartment associated with the evaporator has reached its setpoint temperature, the remaining refrigerant will still evaporate and the temperature will fall below the cut-out value, i. below the setpoint.
  • control or regulation device recognizes that, in the case of parallel operation of at least two evaporators, the evaporator assigned to one compartment is or will be switched off. Then the switch-off value is increased accordingly, so that the re-evaporation of the temperature setpoint in the compartment in question is achieved.
  • comparison means can be provided, which are designed such that they compare the actual temperature value in the compartment in question after switching off the associated evaporator with a temperature setpoint of the compartment, wherein the control or regulating device is designed such that it increases the Ausschaltivess in Depending on the comparison made by the comparison means makes.
  • the present invention further relates to a method for operating a refrigerator and / or freezer with at least one refrigerant circuit with two or more than two parallel connected evaporators, preferably different Cooling compartments of the refrigerator and / or freezer, and with at least one compressor that delivers refrigerant to the evaporators, the refrigerant streams are discharged after flowing through the evaporator by communicating with each other lines that have no shut-off.
  • At least one of the compartments is associated with a switch-off value, which is the temperature actual value of the compartment in which the refrigerant supply to the evaporator associated with the compartment is suppressed, the switch-off value of the compartment is increased if the actual temperature value after switching off the evaporator falls below the switch-off, to avoid that any re-evaporation of refrigerant reaches a temperature in the compartment, which is below the setpoint.
  • a switch-off value which is the temperature actual value of the compartment in which the refrigerant supply to the evaporator associated with the compartment is suppressed
  • the refrigerator and / or freezer is designed so that a comparatively frequent operation of the compressor takes place.
  • the relative duty cycle of the compressor is> 10%, preferably> 40%, preferably> 60% or preferably> 80%.
  • the relative duty cycle of the compressor is to be understood as the ratio of its operating times and the sum of operating and standstill times.
  • the suction line temperature of a compartment or the suction line temperature falls below a limit value, for example 10 ° C. (15 ° C., 0 ° C.)
  • a limit value for example 10 ° C. (15 ° C., 0 ° C.
  • the warmest non-operated compartment is turned on for a certain time to increase the suction line temperature increase. This is done by the increased heat load as a result of connecting another evaporator.
  • a temperature sensor on the suction line measures the corresponding suction line temperature. This value serves as a pulse generator for the device control to effect the above-described evaporator connection.
  • the possibly occurring too low compartment temperature in the switched compartment can be intercepted by a somewhat too warm regulation of individual subjects.
  • the connected compartment remains switched on only until the suction line temperature has warmed above the above limit plus a certain temperature value (eg 5 K or 10 K). Should the addition of a subject not be sufficient, successively another subject will be added.
  • the temperature sensor on the suction line can also be dispensed with and it is possible to control e.g. by a time function (e.g., if Tray 1 is on for 10 minutes, then Tray 2 will be turned on, etc.)
  • a time function e.g., if Tray 1 is on for 10 minutes, then Tray 2 will be turned on, etc.
  • the single figure shows a schematic view of an area of a refrigerant circuit of a refrigerator and / or freezer according to the invention with three evaporators, which can be acted upon at the same time with refrigerant in case of need.
  • the reference numeral 10 denotes the condenser or a line leading from the condenser. By means of the condenser 10 heat is dissipated to the environment.
  • Reference numeral 20 designates a 4-way valve which has the task of guiding the liquefied refrigerant in the liquefier as needed to one or more of the evaporators 30, 40, 50.
  • the valve 20 is designed such that each evaporator 30, 40, 50 can be individually supplied with refrigerant, or that several or all of the evaporators 30 - 50 can be supplied with refrigerant.
  • the valve 20 is designed such that any combinations of the evaporator 30 - 50 can be supplied with refrigerant.
  • the distribution of the refrigerant depends on the refrigeration demand of the compartment (s) to which the evaporators 30-50 are assigned.
  • compartment for example, individual compartments, such. a refrigerated compartment, a freezer compartment or a cold storage compartment, or subregions of such compartments, e.g. individual drawers, etc. may affect.
  • the term “compartment” also encompasses individual regions or zones of a compartment.
  • valve 20 instead of the valve 20, all other means can be used, by means of which the refrigerant in the desired manner to one or more of the evaporator 30 - 50 can be distributed.
  • each evaporator prefferably has an open-close valve or other shut-off means per supply line.
  • each one of the evaporators 30-50 is assigned to exactly one compartment and / or that an evaporator 30-50 is assigned to several compartments and / or that a compartment is cooled by a plurality of evaporators 30-50.
  • shut-off means Downstream of the evaporators 30-50, i. in the section of the refrigerant circuit which in the figure to the right connects to the evaporators 30-50 all the way to the compressor 70, no shut-off means, i. In particular, no valves provided.
  • the suction lines of the evaporators communicate with each other. They are merged at the point 60 to a common suction line, which also has no shut-off and leads directly to the compressor 70.
  • the distribution of the refrigerant to the evaporator 30-50 thus takes place exclusively upstream of the evaporator 30-50.
  • the compressor 70 is connected via a line, not shown, with the condenser 10, so that there is a closed refrigerant circuit.
  • shut-off means and / or other components of a refrigerant circuit such as e.g. Collector arranged.
  • a control or regulation recognizes when the evaporator of a compartment or compartment is to be switched off.
  • the switch-off value of this compartment is increased to such an extent that the temperature setpoint in the compartment is reached even with the said post-evaporation.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)

Claims (11)

  1. Appareil de réfrigération et/ou de congélation doté d'un circuit de fluide réfrigérant comprenant
    au moins deux évaporateurs (30, 40, 50) branchés en parallèle, qui réfrigèrent de préférence différents compartiments de l'appareil de réfrigération et/ou de congélation,
    un compresseur (70) au moyen duquel du fluide réfrigérant est transporté vers les évaporateurs (30, 40, 50), et
    un dispositif de commande (20) susceptible d'être déplacé vers plusieurs positions, qui est disposé en amont des évaporateurs (30, 40, 50) dans le sens d'écoulement du fluide réfrigérant et qui est réalisé de manière à répartir le fluide réfrigérant entre les évaporateurs (30, 40, 50),
    les tuyaux d'aspiration du circuit de fluide réfrigérant sortant des évaporateurs (30, 40, 50) communiquant entre eux et ne comportant pas de moyen d'obturation,
    caractérisé en ce que
    le dispositif de commande (20) est conçu pour, sur la base de la température mesurée par un capteur de température disposé sur un des tuyaux d'aspiration sortant des évaporateurs (30, 40, 50), en cas de dépassement d'une valeur seuil de température d'un tuyau d'aspiration sortant de l'un des évaporateurs (50, 60, 70), mettre en circuit pour une durée déterminée l'évaporateur (30, 40, 50) non exploité et associé au compartiment le plus chaud.
  2. Appareil de réfrigération et/ou de congélation selon la revendication 1, caractérisé en ce que, dans au moins une position de travail du dispositif de commande, en service normal de l'appareil, au moins deux des évaporateurs (30, 40, 50) branchés en parallèle et de préférence tous les évaporateurs (30, 40, 50) branchés en parallèle peuvent être alimentés simultanément en fluide réfrigérant.
  3. Appareil de réfrigération et/ou de congélation selon la revendication 1 ou 2, caractérisé en ce qu'aucun moyen d'obturation et/ou aucun autre composant, par exemple un réservoir de liquide, d'un circuit de fluide réfrigérant n'est disposé dans la partie de tuyau du circuit de fluide réfrigérant située entre les évaporateurs (30, 40, 50) et le compresseur (70).
  4. Appareil de réfrigération et/ou de congélation selon l'une des revendications précédentes, caractérisé en ce que les tuyaux sortant des évaporateurs (30, 40, 50) débouchent dans au moins un tuyau commun qui conduit au compresseur (70).
  5. Appareil de réfrigération et/ou de congélation selon l'une des revendications précédentes, caractérisé en ce que le dispositif de commande est formé par au moins une soupape à plusieurs voies ou par des soupapes individuelles, qui sont respectivement disposées dans les tuyaux conduisant aux évaporateurs (30, 40, 50).
  6. Appareil de réfrigération et/ou de congélation selon l'une des revendications précédentes, caractérisé en ce que le dispositif de commande est réalisé de telle manière que, en fonctionnement normal de l'appareil, dans une première position de travail du dispositif de commande, chacun des évaporateurs (30, 40, 50) peut être appliqué individuellement en fluide réfrigérant et/ou dans une seconde position de travail du dispositif de commande, des groupes des évaporateurs (30, 40, 50) peuvent être appliqués simultanément en fluide réfrigérant et/ou dans une troisième position de travail, tous les évaporateurs (30, 40, 50) peuvent être appliqués simultanément en fluide réfrigérant.
  7. Appareil de réfrigération et/ou de congélation selon l'une des revendications précédentes, caractérisé en ce qu'une valeur de coupure est associée à au moins un des compartiments, celle-ci étant la valeur réelle de température du compartiment, à laquelle l'alimentation en fluide réfrigérant de l'évaporateur (30, 40, 50) associé au compartiment est empêchée, et en ce que l'appareil comporte au moins un dispositif de commande ou de régulation, qui est configuré de manière à augmenter la valeur de coupure du compartiment quand, après l'arrêt de l'évaporateur (30, 40, 50), la valeur réelle de température du compartiment tombe sous la valeur de consigne de température du compartiment.
  8. Appareil de réfrigération et/ou de congélation selon la revendication 7, caractérisé en ce que des moyens de comparaison sont prévus, qui sont configurés de manière à comparer la valeur réelle de température du compartiment après l'arrêt de l'évaporateur (30, 40, 50) associé à celui-ci avec une valeur de consigne de température du compartiment, et en ce que le dispositif de commande ou de régulation est réalisé de manière à effectuer la hausse de la valeur de coupure en fonction de la comparaison effectuée dans les moyens de comparaison.
  9. Procédé de fonctionnement d'un appareil de réfrigération et/ou de congélation doté d'un circuit de fluide réfrigérant comprenant
    au moins deux évaporateurs (30, 40, 50) branchés en parallèle, qui réfrigèrent de préférence différents compartiments de l'appareil de réfrigération et/ou de congélation, et
    un compresseur (70) qui transporte du fluide réfrigérant vers les évaporateurs (30, 40, 50),
    les flux de fluide réfrigérant étant évacués après le passage à travers les évaporateurs (30, 40, 50) par des tuyaux d'aspiration communiquant entre eux, qui ne comportent aucun moyen d'obturation,
    caractérisé en ce que
    en raison de la température mesurée par un capteur de température disposé sur un des tuyaux d'aspiration sortant des évaporateurs, l'évaporateur non exploité et associé au compartiment le plus chaud est mis en circuit pour une durée déterminée en cas de dépassement d'une valeur seuil de température d'un tuyau d'aspiration sortant des évaporateurs (30, 40, 50).
  10. Procédé selon la revendication 9, caractérisé en ce qu'une valeur de coupure est associée à au moins un des compartiments, celle-ci étant la valeur réelle de température du compartiment, à laquelle l'alimentation en fluide réfrigérant de l'évaporateur associé au compartiment est empêchée, et en ce que la valeur de coupure du compartiment est augmentée quand la valeur réelle de température après l'arrêt de l'évaporateur tombe en-dessous la valeur de consigne de température du compartiment.
  11. Procédé selon la revendication 9 ou 10, caractérisé en ce que le temps de fonctionnement relatif du compresseur est de > 10 %, de préférence > 40 %, de préférence > 60 % ou de préférence > 80 %.
EP11001639.1A 2010-03-01 2011-02-28 Appareil de réfrigération et/ou de congélation Active EP2363665B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010009710 2010-03-01
DE102010018543A DE102010018543A1 (de) 2010-03-01 2010-04-28 Kühl- und/oder Gefriergerät

Publications (3)

Publication Number Publication Date
EP2363665A2 EP2363665A2 (fr) 2011-09-07
EP2363665A3 EP2363665A3 (fr) 2015-04-29
EP2363665B1 true EP2363665B1 (fr) 2019-08-28

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EP11001639.1A Active EP2363665B1 (fr) 2010-03-01 2011-02-28 Appareil de réfrigération et/ou de congélation

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EP (1) EP2363665B1 (fr)
DE (1) DE102010018543A1 (fr)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4100749A1 (de) * 1991-01-12 1992-07-16 Danfoss As Regeleinrichtung fuer eine kuehlanlage
DE19547744A1 (de) * 1995-12-20 1997-06-26 Bosch Siemens Hausgeraete Kältegerät
DE10260350B4 (de) * 2002-07-04 2015-11-26 Lg Electronics Inc. Verfahren zur Steuerung eines Betriebs eines mit zwei Verdampfern ausgebildeten Kühlsystems
JP2006177632A (ja) * 2004-12-24 2006-07-06 Denso Corp 冷凍サイクル
KR100800591B1 (ko) * 2007-03-29 2008-02-04 엘지전자 주식회사 냉장고의 제어 방법
JP5210626B2 (ja) * 2007-12-27 2013-06-12 三菱重工業株式会社 陸上輸送用冷凍装置及び陸上輸送用冷凍装置の運転制御方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

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Publication number Publication date
EP2363665A2 (fr) 2011-09-07
EP2363665A3 (fr) 2015-04-29
DE102010018543A1 (de) 2011-09-01

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