EP0789207B1 - Freezing apparatus - Google Patents

Freezing apparatus Download PDF

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Publication number
EP0789207B1
EP0789207B1 EP96113000A EP96113000A EP0789207B1 EP 0789207 B1 EP0789207 B1 EP 0789207B1 EP 96113000 A EP96113000 A EP 96113000A EP 96113000 A EP96113000 A EP 96113000A EP 0789207 B1 EP0789207 B1 EP 0789207B1
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EP
European Patent Office
Prior art keywords
freezing
evaporator
cooling
control means
appliance according
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.)
Expired - Lifetime
Application number
EP96113000A
Other languages
German (de)
French (fr)
Other versions
EP0789207A3 (en
EP0789207A2 (en
Inventor
Roland Dipl.-Ing. Maier (Fh)
Walter Dipl.-Ing. Holz
Hans Christian Mack
Wolfgang Dipl.-Ing. Becker
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BSH Hausgeraete GmbH
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BSH Bosch und Siemens Hausgeraete GmbH
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Publication date
Application filed by BSH Bosch und Siemens Hausgeraete GmbH filed Critical BSH Bosch und Siemens Hausgeraete GmbH
Priority to SI9630664T priority Critical patent/SI0789207T1/en
Publication of EP0789207A2 publication Critical patent/EP0789207A2/en
Publication of EP0789207A3 publication Critical patent/EP0789207A3/en
Application granted granted Critical
Publication of EP0789207B1 publication Critical patent/EP0789207B1/en
Anticipated expiration legal-status Critical
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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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
    • F25D11/02—Self-contained movable devices, e.g. domestic refrigerators with cooling compartments at different temperatures
    • F25D11/022—Self-contained movable devices, e.g. domestic refrigerators with cooling compartments at different temperatures with two or more 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
    • F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
    • F25B5/04—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in series
    • 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
    • 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
    • F25D2400/00—General features of, or devices for refrigerators, cold rooms, ice-boxes, or for cooling or freezing apparatus not covered by any other subclass
    • F25D2400/04—Refrigerators with a horizontal mullion
    • 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
    • F25D2400/00—General features of, or devices for refrigerators, cold rooms, ice-boxes, or for cooling or freezing apparatus not covered by any other subclass
    • F25D2400/30—Quick freezing

Definitions

  • the invention relates to a freezer with at least two arranged inside its heat-insulating housing, thermally separated freezers, of which each is cooled by an evaporator, which one of Compressor are charged with refrigerant.
  • a freezer is for example known from DE-A-1 751 420.
  • the invention is based on the object, a freezer according to the preamble of claim 1 in such a way that the freezing rate for frozen food on easy Way is significantly increased.
  • freezers are equipped with different useful contents are and serving for their cooling evaporator are connected fluidically in series, wherein for cooling the freezer compartment with the larger net capacity Serving evaporator by two control means from the Cooling circuit is decoupled and as a reservoir for liquid Refrigerant is used.
  • the inventive allows Solution with simple means the operation of a Freezer with two freezers, each of which as a **** - freezer suitable.
  • the cooling capacity is such designed to achieve the lowest energy consumption by standard is, wherein the compressor is selected so that he with the conditions prescribed by standard regulations a favorable efficiency works.
  • the cooling capacity increases proportional to the temperature difference, so that the Freezing rate for freshly stored frozen food by significantly lowering the evaporation temperature in the cooling of the freezer compartment lower Nutzinhaltes Serving evaporator is significantly increased.
  • both control means as electrically controllable three- / Zweiwegemagnetventile are formed, one of which in series between the evaporator is inserted and the other three-way solenoid valve on the output side of the evaporator for Cooling the freezer compartment greater Nutzinhaltes arranged is.
  • the control means by an electronic evaluation circuit electrically can be controlled, which depends on the temperature in the Freezer compartment of larger capacity, the control means to or decoupling of the evaporator switches in this freezer compartment.
  • the object of the invention is provided that the Control means by manually actuating an electrical Switch in the for decoupling the evaporator for cooling the freezer compartment larger Nutzinhaltes serving switching position can be brought.
  • a particularly favorable cold transfer from the evaporator surfaces on the goods to be frozen results, if after a further advantageous embodiment of the article the invention is provided that for cooling the freezer compartment serving evaporator arranged as tieragerenartig Wire tube evaporator are formed.
  • evaporators for cooling the freezer can be arranged in these, if for an alternative Embodiment of the subject invention provided is that serving to cool the freezer evaporator as substantially closed-area evaporator blanks are formed.
  • the invention provides that the freezer with the lower net capacity in the housing of the freezer arranged above the freezer with the larger net capacity is.
  • Such an arrangement has the advantage that in addition to a facilitated Feeding the for quick freezing of the frozen food serving freezer lower Nutzinhaltes a much cheaper access to control created over the freezing state of the frozen food.
  • Fig.1 is a purely schematically illustrated household freezer 10, in its heat-insulating housing 11 two superposed freezers 12 and 13th are provided. These are formed by a heat-insulating Intermediate bottom 14 thermally separated from each other and have a different sized payload, wherein the freezer with the lower capacity 12 is arranged overhead.
  • the freezer 12 is cooled by a platinum-shaped evaporator 15, its arranged in turns refrigerant channel arrangement 16 on the output side to the input of an electrically controllable Three / Zweiwegemagnetventils 17 is connected, which has an input and two outputs.
  • One of Outputs of the solenoid valve 17 is connected to a connecting line 18 connected, which with the refrigerant channel order 16th the evaporator 15 in a first working position I of the solenoid valve 17 is connectable.
  • the other outlet of the solenoid valve 17 is at the entrance one to a platinum-like trained evaporator 19 belonging refrigerant channel assembly 16 of the evaporator 15 in a second working position II of the solenoid valve 17 with the refrigerant channel arrangement 20 of the evaporator 19 connected in series is.
  • the evaporator 19 is used to cool the below the freezer compartment 12 arranged freezer compartment 13 and has at the output of its refrigerant channel assembly 20 is an electrical controllable shut-off valve 21, which input side is connected to the refrigerant channel assembly 20 and which output on one with the connecting line 18 fluidly connected refrigerant line 22nd connected.
  • This is with the suction side of a refrigerant compressor 23 connected, which pressure side with a condenser 24 is connected.
  • This one is at his Output via an unspecified refrigerant line connected to a spiral-shaped throttle tube 25, which for the pressure reduction of the condenser 24 incoming refrigerant is used and which with the not illustrated injection point of the evaporator 15 fluidically connected is.
  • FIGs. 1 and 2 are by solid lines different operating states of the domestic freezer 10 and its refrigeration system shown, wherein the 1 shows the "normal operation" shown in FIG. in which on the one hand the solenoid valve 17 in its working position II, the two evaporators 15 and 19 in series connects, and on the other hand that at the outlet of the evaporator 19 arranged shut-off valve 21 in its open position located.
  • the 1 shows the "normal operation" shown in FIG. in which on the one hand the solenoid valve 17 in its working position II, the two evaporators 15 and 19 in series connects, and on the other hand that at the outlet of the evaporator 19 arranged shut-off valve 21 in its open position located.
  • the 1 shows the "normal operation" shown in FIG. in which on the one hand the solenoid valve 17 in its working position II, the two evaporators 15 and 19 in series connects, and on the other hand that at the outlet of the evaporator 19 arranged shut-off valve 21 in its open position located.
  • the control of the refrigerant flow serving control means namely the solenoid valve 17 and the Shut-off valve 21 by means of a non-illustrated, manually operated electrical switch in their other Working positions can be brought, with the solenoid valve 17 after the switching in his the refrigerant channel assembly 16 with the connecting line 18 connecting working position I is while the shut-off valve 21 through the switching from its open position to its shut-off position passes.
  • the Evaporator 15 and 19 as a wire tube evaporator with in different levels arranged evaporator storage be educated.

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

Description

Die Erfindung betrifft ein Gefriergerät mit wenigstens zwei innerhalb seines wärmeisolierenden Gehäuses angeordneten, thermisch voneinander getrennten Gefrierfächern, von denen jedes von einem Verdampfer gekühlt ist, welche von einem Verdichter mit Kältemittel beaufschlagt sind. Ein derartiges Gefriergerät ist zum Beispiel aus der DE-A-1 751 420 bekannt.The invention relates to a freezer with at least two arranged inside its heat-insulating housing, thermally separated freezers, of which each is cooled by an evaporator, which one of Compressor are charged with refrigerant. Such a freezer is for example known from DE-A-1 751 420.

Bei frischen Nahrungsmitteln, welche durch Eingefrieren über eine längere Zeitdauer konserviert werden sollen, ist man darauf bedacht, diese möglichst umgehend einem Gefrierprozess zu unterziehen. Um zu vermeiden, daß das Gefriergut während des Eingefriervorganges aufgrund einer ungenügenden Gefriergeschwindigkeit Qualitätseinbußen, z.B. in Form einer geschmacklichen Beeinträchtigung erleidet, ist für ein möglichst rasches Gefrieren des Gefriergutes Sorge zu tragen.For fresh food, which by freezing over one should be preserved for a longer period of time Be aware of this as soon as possible a freezing process to undergo. To avoid the frozen food during the Einfrriervorganges due to an insufficient Freezing rate Quality degradation, e.g. in form of a taste impairment is for a possible rapid freezing of the frozen food care.

Der Erfindung liegt die Aufgabe zugrunde, ein Gefriergerät gemäß dem Oberbegriff des Anspruches 1 derart auszubilden, daß die Gefriergeschwindigkeit für Gefriergut auf einfache Weise deutlich erhöht ist. The invention is based on the object, a freezer according to the preamble of claim 1 in such a way that the freezing rate for frozen food on easy Way is significantly increased.

Diese Aufgabe wird gemäß der Erfindung dadurch gelöst, daß die Gefrierfächer mit unterschiedlichem Nutzinhalt ausgestattet sind und die zu deren Kühlung dienenden Verdampfer in Reihenschaltung strömungstechnisch verbunden sind, wobei der zur Kühlung des Gefrierfaches mit dem größeren Nutzinhalt dienende Verdampfer durch zwei Steuermittel aus dem Kältekreis auskoppelbar ist und als Reservoir für flüssiges Kältemittel dient.This object is achieved according to the invention in that the freezers are equipped with different useful contents are and serving for their cooling evaporator are connected fluidically in series, wherein for cooling the freezer compartment with the larger net capacity Serving evaporator by two control means from the Cooling circuit is decoupled and as a reservoir for liquid Refrigerant is used.

Durch die Auskopplung des mit flüssigem Kältemittel gefülltem, als Reservoir dienenden Verdampfer zur Kühlung des Gefrierfaches größeren Nutzinhaltes ist es möglich, nur noch den zur Kühlung des Gefrierfaches geringeren Nutzinhaltes dienenden Verdampfer, im Kältekreis ohne Überfüllung mit flüssigem Kältemittel zu betreiben. In dieser Betriebsweise sinkt infolge des an sich für zur Beaufschlagung beider Verdampfer mit Kältemittel ausgelegten Verdichters der Verdampfungsdruck und somit die Verdampfungstemperatur, bei dem zur Kühlung des Gefrierfaches mit dem geringeren Nutzinhalt dienenden Verdampfer so daß dessen Kälteleistung deutlich ansteigt und somit ein wesentlich rascheres Durchgefrieren von frisch eingelegtem Gefriergut möglich ist. Außerdem ergibt sich für das Gefrierfach mit dem geringeren Nutzinhalt bei gleicher Wärmeisolation dieses Faches ein geringerer Wärmeeinfall, wodurch ebenfalls die Verdampfungstemperatur des Kältemittels absinkt und somit die Kälteleistung des Verdampfers gesteigert ist. Darüberhinaus ermöglicht die erfindungsgemäße Lösung mit einfachen Mitteln den Betrieb eines Gefriergerätes mit zwei Gefrierfächern, von denen sich jedes als ****-Gefrierfach eignet. Bei dem Betrieb des Gefriergerätes mit zwei Gefrierfächern ist die Kälteleistung derart ausgelegt, daß nach Norm der günstigste Energieverbrauch erzielt ist, wobei der Verdichter so ausgewählt ist, daß er bei den durch Normvorschriften vorgegebenen Bedingungen mit einem günstigen Wirkungsgrad arbeitet.By decoupling the filled with liquid refrigerant, serving as a reservoir evaporator for cooling the freezer compartment larger Nutzinhaltes, it is possible only the for cooling the freezer compartment lower Nutzinhaltes Serving evaporator, in the refrigerant circuit without overfilling with to operate liquid refrigerant. In this mode of operation decreases as a result of itself for acting on both evaporators with refrigerant compressor designed the evaporation pressure and thus the evaporation temperature at which Cooling the freezer compartment with the lower useful content serving Evaporator so that its cooling capacity increases significantly and thus a much faster freezing of freshly picked frozen food is possible. It also gives For the freezer with the lower useful content same heat insulation of this compartment a lower incidence of heat, whereby also the evaporation temperature of Refrigerant drops and thus the cooling capacity of the evaporator is increased. In addition, the inventive allows Solution with simple means the operation of a Freezer with two freezers, each of which as a **** - freezer suitable. In the operation of the freezer with two freezers, the cooling capacity is such designed to achieve the lowest energy consumption by standard is, wherein the compressor is selected so that he with the conditions prescribed by standard regulations a favorable efficiency works.

Für die Kälteleistung gilt folgende Gleichung: Q = k · A · ΔT

Q =
Kälteleistung (W)
k =
Wärmedurchgangszahl (W/m2K)
A =
Kontaktfläche des Gefriergutes zu den Wärmetauschflächen (m2)
ΔT =
Temperaturdifferenz zwischen der Gefrierware und dem zu verdampfenden Kältemittel.
For the cooling capacity, the following equation applies: Q = k · A · ΔT
Q =
Cooling capacity (W)
k =
Heat transfer coefficient (W / m 2 K)
A =
Contact surface of the frozen food to the heat exchange surfaces (m 2 )
ΔT =
Temperature difference between the frozen product and the refrigerant to be evaporated.

Wie aus der Gleichung ersichtlich ist, steigt die Kälteleistung proportional zur Temperaturdifferenz an, so daß die Gefriergeschwindigkeit für frisch eingelagertes Gefriergut durch das deutliche Absenken der Verdampfungstemperatur in dem zur Kühlung des Gefrierfaches geringeren Nutzinhaltes dienenden Verdampfers wesentlich gesteigert ist.As can be seen from the equation, the cooling capacity increases proportional to the temperature difference, so that the Freezing rate for freshly stored frozen food by significantly lowering the evaporation temperature in the cooling of the freezer compartment lower Nutzinhaltes Serving evaporator is significantly increased.

Schaltungstechnisch besonders sicher mit geringem technischen Aufwand auskoppelbar ist das in dem Verdampfer zur Kühlung des Gefrierfaches mit dem größeren Nutzinhalt enthaltene Kältemittel, wenn nach einer bevorzugten Ausführungsform des Gegenstandes der Erfindung vorgesehen ist, daß eines der Steuermittel als ein in die Reihenschaltung der Verdampfer eingebrachtes elektrisch ansteuerbares Drei--Zweiwegemagnetventil und das andere Steuermittel als am Ausgang des im Gefrierfach größeren Nutzinhaltes vorgesehenen Verdampfers angeordnetes elektrisch ansteuerbares Absperrventil ausgebildet ist.Circuit technology particularly safe with low technical Unnecessary expenditure is in the evaporator for Cooling of the freezer compartment with the larger net capacity contained Refrigerant, when according to a preferred embodiment the object of the invention is provided that one of the control means as a in the series circuit of Evaporator introduced electrically controllable three - way solenoid valve and the other control means than at the exit of provided in the freezer compartment Nutzinhaltes Evaporator arranged electrically controllable shut-off valve is trained.

Eine ebenso sichere Separierung des Kältemittels im Verdampfer zur Kühlung des Gefrierfaches größeren Nutzinhaltes ergibt sich, wenn nach einer alternativen Ausgestaltung des Gegenstandes der Erfindung vorgesehen ist, daß beide Steuermittel als elektrisch ansteuerbare Drei-/Zweiwegemagnetventile ausgebildet sind, wovon eines in Reihenschaltung zwischen die Verdampfer eingebracht ist und das andere Drei-Zweiwegemagnetventil ausgangsseitig an dem Verdampfer zur Kühlung des Gefrierfaches größeren Nutzinhaltes angeordnet ist.An equally secure separation of the refrigerant in the evaporator for cooling the freezer compartment results in greater Nutzinhaltes if, according to an alternative embodiment of the Subject matter of the invention is provided that both control means as electrically controllable three- / Zweiwegemagnetventile are formed, one of which in series between the evaporator is inserted and the other three-way solenoid valve on the output side of the evaporator for Cooling the freezer compartment greater Nutzinhaltes arranged is.

Besonders genau ist die zur Erreichung einer tiefen Verdampfungstemperatur im Verdampfer zur Kühlung des Gefrierfaches geringeren Nutzinhaltes im Kältekreis notwendige Kältemittelmenge erreichbar, wenn nach einer nächsten bevorzugten Ausgestaltung des Gegenstandes der Erfindung vorgesehen ist, daß der Umschaltvorgang der Steuermittel zur Auskopplung des Verdampfers zur Kühlung des Gefrierfaches größeren Nutzinhaltes wenigstens annähernd zeitgleich erfolgt.Especially accurate is the achievement of a low evaporation temperature in the evaporator for cooling the freezer compartment lower useful content in the refrigerant circuit necessary amount of refrigerant achievable if after a next preferred Embodiment of the subject invention is provided that the switching operation of the control means for coupling the Evaporator for cooling the freezer compartment greater Nutzinhaltes at least approximately at the same time.

Entsprechend einer weiteren bevorzugten Ausführungsform des Gegegnstandes der Erfindung ist vorgesehen, daß die Steuermittel durch eine elektronische Auswerteschaltung elektrisch ansteuerbar sind, welche in Abhängigkeit der Temperatur im Gefrierfach größeren Nutzinhaltes die Steuermittel zur Ein- bzw. Auskopplung des Verdampfers in diesem Gefrierfach umschaltet. According to a further preferred embodiment of the Gegegnstandes the invention is provided that the control means by an electronic evaluation circuit electrically can be controlled, which depends on the temperature in the Freezer compartment of larger capacity, the control means to or decoupling of the evaporator switches in this freezer compartment.

Auf diese Weise ist stets sicher verhindert, daß während des Eingefriervorganges im Gefrierfach geringeren Nutzinhaltes die Temperatur im Gefrierfach größeren Nutzinhaltes über die Bestimmungstemperatur ansteigt und das dort eingelagerte Gut Schaden nimmt.In this way it is always safely prevented during the Freezing process in the freezer compartment less useful content the temperature in the freezer compartment greater Nutzinhaltes over the Determination temperature rises and the stored there Good Takes damage.

Auf besonders einfache Art und Weise nach Bedarf einleitbar ist der Gefrierprozess im Gefrierfach geringeren Nutzinhaltes, wenn nach einer nächsten vorteilhaften Ausgestaltung des Gegenstandes der Erfindung vorgesehen ist, daß die Steuermittel durch manuelles Betätigen eines elektrischen Schalters in die zur Auskopplung des Verdampfers zur Kühlung des Gefrierfaches größeren Nutzinhaltes dienende Schaltstellung bringbar ist.Introduced as needed in a particularly simple manner is the freezing process in the freezer less useful content, if according to a next advantageous embodiment the object of the invention is provided that the Control means by manually actuating an electrical Switch in the for decoupling the evaporator for cooling the freezer compartment larger Nutzinhaltes serving switching position can be brought.

Eine besonders günstige Kälteübertragung von den Verdampferflächen auf das einzugefrierende Gut ergibt sich, wenn nach einer weiteren vorteilhaften Ausgestaltung des Gegenstandes der Erfindung vorgesehen ist, daß die zur Kühlung des Gefrierfaches dienenden Verdampfer als etagerenartig angeordnete Drahtrohrverdampfer ausgebildet sind.A particularly favorable cold transfer from the evaporator surfaces on the goods to be frozen results, if after a further advantageous embodiment of the article the invention is provided that for cooling the freezer compartment serving evaporator arranged as tieragerenartig Wire tube evaporator are formed.

Besonders platzsparend sind Verdampfer zur Kühlung der Gefrierfächer in diesen anordenbar, wenn nach einer alternativen Ausgestaltung des Gegenstandes der Erfindung vorgesehen ist, daß die zur Kühlung der Gefrierfächer dienenden Verdampfer als im wesentlichen geschlossenflächige Verdampferplatinen ausgebildet sind.Particularly space saving are evaporators for cooling the freezer can be arranged in these, if for an alternative Embodiment of the subject invention provided is that serving to cool the freezer evaporator as substantially closed-area evaporator blanks are formed.

Gemäß einer letzten bevorzugten Ausführungsform des Gegenstandes der Erfindung ist vorgesehen, daß das Gefrierfach mit dem geringeren Nutzinhalt im Gehäuse des Gefriergerätes über dem Gefrierfach mit dem größeren Nutzinhalt angeordnet ist.According to a last preferred embodiment of the article The invention provides that the freezer with the lower net capacity in the housing of the freezer arranged above the freezer with the larger net capacity is.

Eine solche Anordnung hat den Vorteil, daß neben einer erleichterten Beschickung des zum raschen Ausgefrieren des Gefriergutes dienenden Gefrierfaches geringeren Nutzinhaltes eine deutlich günstigere Zugriffsmöglichkeit zur Kontrolle über den Ausgefrierzustand des Gefriergutes geschaffen ist.Such an arrangement has the advantage that in addition to a facilitated Feeding the for quick freezing of the frozen food serving freezer lower Nutzinhaltes a much cheaper access to control created over the freezing state of the frozen food.

Die Erfindung ist in der nachfolgenden Beschreibung anhand eines in der beigefügten Zeichnung vereinfacht dargestellten Ausführungsbeispieles erläutert. Es zeigen:

Fig.1
einen Haushaltsgefrierschrank in schematischer Darstellung mit zwei thermisch voneinander getrennten, einen unterschiedlichen Nutzinhalt aufweisenden Gefrierfächern mit darin angeordneten Verdampfern in einem Kältekreis mit zwei Steuermitteln in einer ersten Arbeitsstellung, in welcher beide Verdampfer mit Kältemittel beaufschlagt sind und
Fig.2
den Haushaltsgefrierschrank gemäß Fig.1, jedoch die Steuermittel in ihrer zweiten Arbeitsstellung, in welcher lediglich der Verdampfer im Gefrierfach mit dem geringeren Nutzinhalt mit Kältemittel beaufschlagt ist.
The invention is explained in the following description with reference to an embodiment shown in simplified form in the accompanying drawing. Show it:
Fig.1
a household freezer in a schematic representation with two thermally separated from each other, a different useful content having freezers arranged therein evaporators in a refrigeration circuit with two control means in a first working position, in which both evaporators are acted upon with refrigerant and
Fig.2
1, but the control means in its second working position, in which only the evaporator in the freezer compartment is acted upon by the lower net capacity with refrigerant.

In Fig.1 ist ein rein schematisch dargestellter Haushaltsgefrierschrank 10 gezeigt, in dessen wärmeisolierendem Gehäuse 11 zwei übereinander angeordnete Gefrierfächer 12 und 13 vorgesehen sind. Diese sind durch einen wärmeisolierend ausgebildeten Zwischenboden 14 thermisch voneinander getrennt und weisen einen unterschiedlich großen Nutzinhalt auf, wobei das mit dem geringeren Nutzinhalt ausgestattete Gefrierfach 12 obenliegend angeordnet ist. Das Gefrierfach 12 ist von einem platinenartig ausgebildeten Verdampfer 15 gekühlt, dessen in Windungen angeordnete Kältemittel-Kanalanordnung 16 ausgangsseitig an den Eingang eines elektrisch ansteuerbaren Drei/Zweiwegemagnetventils 17 angeschlossen ist, welches einen Eingang und zwei Ausgänge aufweist. Einer der Ausgänge des Magnetventils 17 ist an eine Verbindungsleitung 18 angeschlossen, welche mit der Kältemittel-Kanalordnung 16 des Verdampfers 15 in einer ersten Arbeitsstellung I des Magnetventiles 17 verbindbar ist. Der andere Ausgang des Magnetventiles 17 ist an den Eingang einer zu einem platinenartig ausgebildeten Verdampfer 19 gehörenden Kältemittel-Kanalanordnung 16 des Verdampfers 15 in einer zweiten Arbeitsstellung II des Magnetventils 17 mit der Kältemittel- Kanalanordnung 20 des Verdampfers 19 in Reihenschaltung verbindbar ist. Der Verdampfer 19 dient zur Kühlung des unterhalb des Gefrierfaches 12 angeordneten Gefrierfaches 13 und weist am Ausgang seiner Kältemittel-Kanalanordnung 20 ein elektrisch ansteuerbares Absperrventil 21 auf, welches eingangsseitig mit der Kältemittel-Kanalanordnung 20 verbunden ist und welches ausgangsseitig an eine mit der Verbindungsleitung 18 strömungstechnisch verbundene Kältemittelleitung 22 angeschlossen ist. Diese ist mit der Saugseite eines Kältemittel-Verdichters 23 verbunden, welcher druckseitig mit einem Verflüssiger 24 verbunden ist. Dieser ist an seinem Ausgang über eine nicht näher bezeichnete Kältemittelleitung an ein spiralenartig ausgebildetes Drosselrohr 25 angeschlossen, welches zur Druckreduzierung des vom Verflüssiger 24 zuströmenden Kältemittels dient und welches mit der nicht dargestellten Einspritzstelle des Verdampfers 15 strömungstechnisch verbunden ist.In Fig.1 is a purely schematically illustrated household freezer 10, in its heat-insulating housing 11 two superposed freezers 12 and 13th are provided. These are formed by a heat-insulating Intermediate bottom 14 thermally separated from each other and have a different sized payload, wherein the freezer with the lower capacity 12 is arranged overhead. The freezer 12 is cooled by a platinum-shaped evaporator 15, its arranged in turns refrigerant channel arrangement 16 on the output side to the input of an electrically controllable Three / Zweiwegemagnetventils 17 is connected, which has an input and two outputs. One of Outputs of the solenoid valve 17 is connected to a connecting line 18 connected, which with the refrigerant channel order 16th the evaporator 15 in a first working position I of the solenoid valve 17 is connectable. The other outlet of the solenoid valve 17 is at the entrance one to a platinum-like trained evaporator 19 belonging refrigerant channel assembly 16 of the evaporator 15 in a second working position II of the solenoid valve 17 with the refrigerant channel arrangement 20 of the evaporator 19 connected in series is. The evaporator 19 is used to cool the below the freezer compartment 12 arranged freezer compartment 13 and has at the output of its refrigerant channel assembly 20 is an electrical controllable shut-off valve 21, which input side is connected to the refrigerant channel assembly 20 and which output on one with the connecting line 18 fluidly connected refrigerant line 22nd connected. This is with the suction side of a refrigerant compressor 23 connected, which pressure side with a condenser 24 is connected. This one is at his Output via an unspecified refrigerant line connected to a spiral-shaped throttle tube 25, which for the pressure reduction of the condenser 24 incoming refrigerant is used and which with the not illustrated injection point of the evaporator 15 fluidically connected is.

In den Fig. 1 und 2 sind durch verstärkt ausgezogene Linien unterschiedliche Betriebszustände des Haushaltsgefrierschrankes 10 und seiner Kälteanlage dargestellt, wobei der in Fig.1 gezeigte Betriebszustand den "Normalbetrieb" zeigt, in welchem einerseits das Magnetventil 17 in seiner Arbeitsstellung II die beiden Verdampfer 15 und 19 in Reihenschaltung verbindet, und andererseits das am Ausgang des Verdampfers 19 angeordnete Absperrventil 21 sich in seiner Offenstellung befindet. In diesem Betriebszustand des Haushaltsgefrierschrankes 10 sind beide Verdampfer 15 und 19 innerhalb des Kältemittelkreises angeordnet und von flüssigem Kältemittel durchströmt, so daß die von ihnen gekühlten Gefrierfächer 12 und 13 ihre bestimmungsgemäße Betriebstemperatur aufweisen.In Figs. 1 and 2 are by solid lines different operating states of the domestic freezer 10 and its refrigeration system shown, wherein the 1 shows the "normal operation" shown in FIG. in which on the one hand the solenoid valve 17 in its working position II, the two evaporators 15 and 19 in series connects, and on the other hand that at the outlet of the evaporator 19 arranged shut-off valve 21 in its open position located. In this operating state of the household freezer 10 are both evaporators 15 and 19 within arranged the refrigerant circuit and liquid Refrigerant flows through, so that they cooled by freezers 12 and 13 their intended operating temperature exhibit.

Für den Fall, daß frisches Gefriergut rasch durchgefroren werden soll, sind die zur Steuerung des Kältemittelflusses dienenden Steuermittel nämlich das Magnetventil 17 und das Absperrventil 21 mittels eines nicht näher dargestellten, manuell zu bedienenden elektrischen Schalters in ihre anderen Arbeitsstellungen bringbar, wobei sich das Magnetventil 17 nach dem Umschaltvorgang in seiner die Kältemittel-Kanalanordnung 16 mit der Verbindungsleitung 18 verbindenden Arbeitsstellung I befindet, während das Absperrventil 21 durch den Umschaltvorgang von seiner Offenstellung in seine Absperrstellung übergeht. In diesem Betriebszustand des Haushaltsgefrierschrankes 10 ist der Verdampfer 19 mit seiner Kältemittel-Kanalanordnung 20 und dem darin befindlichen flüssigen Kältemittel aus dem Kältekreis ausgekoppelt, so daß im Kältekreis nur noch die zur Kühlung des Verdampfers 15 notwendige Kältemittelmenge verbleibt, wodurch der Verdampfungsdruck der im Kältekreis verbleibenden Kältemittelmenge aufgrund des an sich hinsichtlich seines Fördervolumens auf die Versorgung beider Verdampfer 15 und 19 mit flüssigem Kältemittel ausgelegtem Kältemittel-Verdichters 23 absinkt und somit die Verdampfungstemperatur des Kältemittels eine wesentliche Absenkung erfährt. Durch die tiefe Verdampfungstemperatur des Kältemittels ist zwischen dem Verdampfer 15 und dem frisch eingelegtem Gefriergut ein den Eingefriervorgang stark beschleunigender Temperaturunterschied geschaffen, welcher zusätzlich noch durch das Absenken der Verdampfungstemperatur aufgrund des geringeren Wärmeeinfalls in das Gefrierfach 12, bedingt durch dessen geringeren Nutzinhalt, günstig beeinflußt ist.In the event that fresh frozen food quickly frozen through should be, are the control of the refrigerant flow serving control means namely the solenoid valve 17 and the Shut-off valve 21 by means of a non-illustrated, manually operated electrical switch in their other Working positions can be brought, with the solenoid valve 17 after the switching in his the refrigerant channel assembly 16 with the connecting line 18 connecting working position I is while the shut-off valve 21 through the switching from its open position to its shut-off position passes. In this operating state of the household freezer 10 is the evaporator 19 with his Refrigerant duct assembly 20 and the therein liquid refrigerant discharged from the refrigerant circuit, so that in the refrigerant circuit only to cool the evaporator 15 necessary amount of refrigerant remains, causing the evaporation pressure the amount of refrigerant remaining in the refrigerant circuit because of itself in terms of its funding volume on the supply of both evaporators 15 and 19 with liquid refrigerant designed refrigerant compressor 23 decreases and thus the evaporation temperature of the refrigerant undergoes a significant reduction. Through the deep Evaporation temperature of the refrigerant is between the Evaporator 15 and the freshly inserted frozen food a the Freezing process strongly accelerating temperature difference created, which additionally by lowering the evaporation temperature due to the lower heat input in the freezer compartment 12, due to its lower Nutzinhalt, is favorably influenced.

Zur zusätzlichen Steigerung der Gefriergeschwindigkeit kann im Gefrierfach 12 zusätzlich ein die Kühlluft darin umwälzender Ventilator vorgesehen sein, wodurch sich eine günstigere Wärmeübertragung vom Verdampfer 15 auf das in dem Gefrierfach 12 eingelagerte Gefriergut ergibt.For additional increase in freezing speed can in the freezer compartment 12 in addition to the cooling air therein revolving Fan be provided, resulting in a cheaper Heat transfer from the evaporator 15 to that in the freezer 12 stored frozen food results.

Für den Fall, daß während des Eingefriervorganges im Gefrierfach 12 die Temperatur im Gefrierfach 13 unzulässig hoch ansteigt, wird sowohl das Magnetventil 17 als auch das Absperrventil 21 durch eine nicht gezeigte, die Temperatur im Gefrierfach 13 auswertende elektronische Auswerteschaltung in diejenige Arbeitsstellung umgeschaltet, in welcher der Verdampfer 19 wieder in den Kältemittelkreis eingekoppelt ist, so daß dessen Kältemittel-Kanalanordnung 20 wieder von flüssigem Kältemittel durchströmt ist. In the event that during the Einfrriervorganges in the freezer 12 the temperature in the freezer compartment 13 inadmissible rises high, both the solenoid valve 17 and the Shut-off valve 21 by a temperature, not shown in the freezer compartment 13 evaluating electronic evaluation circuit switched to the working position in which the evaporator 19 is coupled back into the refrigerant circuit is, so that its refrigerant channel assembly 20 again is traversed by liquid refrigerant.

Nachdem die für ein rasches Durchgefrieren im Gefrierfach 12 notwendige Tiefkühltemperatur erreicht ist, schaltet die elektronische Auswerteschaltung die beiden Steuermittel in ihren beide Gefrierfächer 12 und 13 mit Kältemittel beaufschlagenden Betriebszustand um.After that, for a quick freeze in the freezer 12 necessary freezing temperature is reached, the switches electronic evaluation circuit, the two control means in their both freezers 12 and 13 acted upon by refrigerant Operating state.

Gute Gefriergeschwindigkeiten für das Gefriergut im Gefrierfach 12 haben sich bereits ergeben, wenn dessen Nutzinhalt kleiner oder gleich einem Fünftel des Nutzinhaltes des Gefrierfaches 13 ist.Good freezing speeds for the frozen food in the freezer 12 have already surrendered if its useful content less than or equal to one fifth of the useful contents of the freezer compartment 13 is.

Entgegen dem beschriebenen Ausführungsbeispiel können die Verdampfer 15 und 19 auch als Drahtrohrverdampfer mit in verschiedenen Höhenlagen angeordneten Verdampferetageren ausgebildet sein.Contrary to the described embodiment, the Evaporator 15 and 19 as a wire tube evaporator with in different levels arranged evaporator storage be educated.

Claims (9)

  1. Freezing appliance with at least two freezing compartments which are arranged within its thermally insulating housing and thermally separated from one another and each of which is cooled by an evaporator, which is charged with refrigerant by a compressor, characterised in that the freezing compartments (12, 13) have different useful volumes and the evaporators (15, 19) serving for cooling thereof are connected in series in terms of flow, wherein the evaporator (19) serving for cooling the freezing compartment (13) with the greater useful volume can be decoupled from the refrigerating circuit by two control means and serves as a reservoir for liquid refrigerant.
  2. Freezing appliance according to claim 2, characterised in that one of the control means is constructed as an electrically controllable three-way/two-way magnetic·valve (17) installed in series with the evaporators (15, 19) and the other control means is constructed as an electrically controllable blocking valve (21) arranged at the outlet of the evaporator (19) provided in the freezing compartment (13) of greater useful volume.
  3. Freezing appliance according to claim 1, characterised in that the two control means are constructed as electrically controllable three-way/two-way magnetic valves (17), of which one is arranged in series between the evaporators (15, 19) and the other three-way/two-way magnetic valve (17) is arranged at the outlet side at the evaporator (19) for cooling the freezing compartment (13) of greater useful volume.
  4. Freezing appliance according to one of claims 1 to 3, characterised in that the switching-over process of the control means (17, 21) for decoupling of the evaporator (19) for cooling of the freezing compartment (13) of greater useful volume is carried out approximately simultaneously.
  5. Freezing appliance according to one of claims 1 to 4, characterised in that the control means (17, 21) are electrically controllable by an electronic evaluating circuit, which depending on the temperature in the freezing compartment (13) of greater useful volume switches over the control means (17, 21) for coupling the evaporator (19) to or decoupling the evaporator (19) from this freezing compartment (13).
  6. Freezing appliance according to one of claims 1 to 5, characterised in that the control means (17, 21) can be brought by manual actuation of an electrical switch into the switch setting serving for decoupling the evaporator (19) for cooling the freezing compartment (13) of greater useful volume.
  7. Freezing appliance according to one of claims 1 to 6, characterised in that the evaporators (15, 19) serving for cooling the freezing compartments (12, 13) are constructed as wire tube evaporators arranged in tiered manner.
  8. Freezing appliance according to one of claims 1 to 6, characterised in that the evaporators (15, 19) serving for cooling the freezing compartments (12, 13) are constructed as substantially closed-area evaporator plates.
  9. Freezing appliance according to one of claims 1 to 8, characterised in that the freezing compartment (12) with the smaller useful volume is arranged in the housing (11) of the freezing appliance (10) above the freezing compartment (13) with the greater useful volume.
EP96113000A 1995-09-21 1996-08-09 Freezing apparatus Expired - Lifetime EP0789207B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI9630664T SI0789207T1 (en) 1995-09-21 1996-08-09 Freezing apparatus

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19535145A DE19535145A1 (en) 1995-09-21 1995-09-21 Domestic freezer with fast-freeze facility
DE19535145 1995-09-21

Publications (3)

Publication Number Publication Date
EP0789207A2 EP0789207A2 (en) 1997-08-13
EP0789207A3 EP0789207A3 (en) 2000-05-31
EP0789207B1 true EP0789207B1 (en) 2003-11-05

Family

ID=7772804

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96113000A Expired - Lifetime EP0789207B1 (en) 1995-09-21 1996-08-09 Freezing apparatus

Country Status (5)

Country Link
EP (1) EP0789207B1 (en)
DE (2) DE19535145A1 (en)
ES (1) ES2210330T3 (en)
SI (1) SI0789207T1 (en)
TR (1) TR199600707A2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10145139A1 (en) * 2001-09-13 2003-04-03 Bsh Bosch Siemens Hausgeraete Refrigerator with two evaporators

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE723128C (en) * 1941-08-31 1942-07-29 Lumophon Werke Bruckner & Star Cooling system
US2440534A (en) * 1947-01-04 1948-04-27 Gen Electric Selecting valve for two-temperature refrigerating systems
GB647601A (en) * 1947-04-22 1950-12-20 British Thomson Houston Co Ltd Improvements in and relating to refrigerating systems
FR987661A (en) * 1948-06-30 1951-08-17 Svenska Turbinfab Ab Improvements to refrigerating machines or refrigerating heat pumps
GB716651A (en) * 1951-04-28 1954-10-13 Gen Motors Corp Improved refrigeration apparatus
GB770272A (en) * 1952-02-20 1957-03-20 Gen Electric Improvements in and relating to refrigerating systems
DE1751420A1 (en) * 1968-05-27 1970-10-01 Siegas Metallwarenfab Combined refrigerator

Also Published As

Publication number Publication date
SI0789207T1 (en) 2004-06-30
DE59610808D1 (en) 2003-12-11
EP0789207A3 (en) 2000-05-31
EP0789207A2 (en) 1997-08-13
DE19535145A1 (en) 1997-03-27
TR199600707A2 (en) 1997-04-22
ES2210330T3 (en) 2004-07-01

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