EP3172507B1 - Refrigeration appliance comprising a fluid reservoir - Google Patents

Refrigeration appliance comprising a fluid reservoir Download PDF

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Publication number
EP3172507B1
EP3172507B1 EP15739280.4A EP15739280A EP3172507B1 EP 3172507 B1 EP3172507 B1 EP 3172507B1 EP 15739280 A EP15739280 A EP 15739280A EP 3172507 B1 EP3172507 B1 EP 3172507B1
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EP
European Patent Office
Prior art keywords
heat
heat transfer
refrigeration appliance
tank
heat exchanger
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EP15739280.4A
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German (de)
French (fr)
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EP3172507A1 (en
Inventor
Karl-Friedrich Laible
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BSH Hausgeraete GmbH
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BSH Hausgeraete GmbH
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Publication of EP3172507A1 publication Critical patent/EP3172507A1/en
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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
    • F25D11/025—Self-contained movable devices, e.g. domestic refrigerators with cooling compartments at different temperatures using primary and secondary refrigeration systems
    • 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
    • F25D23/00—General constructional features
    • F25D23/12—Arrangements of compartments additional to cooling compartments; Combinations of refrigerators with other equipment, e.g. stove
    • F25D23/126—Water cooler
    • 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
    • F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
    • F25D17/02—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating liquids, e.g. brine
    • 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
    • F25D23/00—General constructional features
    • F25D23/06—Walls
    • F25D23/065—Details
    • F25D23/068—Arrangements for circulating fluids through the insulating material
    • 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
    • F25D2323/00—General constructional features not provided for in other groups of this subclass
    • F25D2323/122—General constructional features not provided for in other groups of this subclass the refrigerator is characterised by a water tank for the water/ice dispenser

Definitions

  • the present invention relates to a refrigeration appliance, in particular a domestic refrigeration appliance, with a heat-insulating wall delimiting a cooled storage chamber and a tank embedded in the wall.
  • a refrigeration appliance in particular a domestic refrigeration appliance
  • a heat-insulating wall delimiting a cooled storage chamber and a tank embedded in the wall.
  • Such tanks are widely used to supply a cold water dispenser in household refrigerators.
  • Out DE 10 2006 052 554 A1 is a refrigeration device with integrated into the rear wall of a dispenser water tank known, in which on one side of the tank air-conveying lines are recessed, which communicate via a passage in the insulating material layer of the wall with the storage chamber. These conduits act as a tank cooling heat exchanger which uses the air of the storage chamber as the heat transfer fluid.
  • the low heat capacity of the air requires a fan to provide sufficient air circulation to cool the tank under normal operating conditions.
  • the cross-section of the lines must be large and, due to the tight installation space, the length of the lines is small. The combination of small length and large cross-section means that the air circulates through the heat exchanger even when the fan is not in operation.
  • the US 4,866,949 discloses a refrigerator having an output on a front door for a refrigerated carbonated liquid such as water or drinks.
  • a carbonator is provided, which is cooled by an evaporation unit.
  • the Evaporation unit communicates with a liquefaction unit which is arranged in the freezer compartment.
  • the US 2009/0260371 A1 discloses a refrigeration device with a first and a second refrigeration cycle equip, the second refrigeration cycle 52 is supplied by a coupler 72 of the first refrigeration cycle 30 with thermal energy.
  • the US 3,908,394 B discloses a refrigerator with a valve and a piping system for beverage dispensing.
  • the pipe system contains frozen ice.
  • the valve When the valve is opened, the pipe system expands due to the water pressure and the water flowing past the frozen ice 44 is cooled.
  • the WO 2010/034330 A1 discloses a beverage cooler having a cooling vessel having an inlet and an outlet for conveying drinks to and from the cooling vessel. Through the cooling tank, a cooling pipe is guided to cool the drink in the cooling tank.
  • the DE 10 2005 014 742 A1 discloses a device for cooling drinks with a phase change material containing cold storage equip.
  • the cold storage can be arranged in a wall or within the interior of the shock cooling device. Through the cold storage a pipe is passed for a liquid to be cooled.
  • the US 2,709,343 discloses a refrigerator with an attached to the ice tank evaporator, wherein the evaporator cools the refrigerator and the ice tank.
  • a condenser is arranged in the engine room of the refrigerator.
  • an electric heater is additionally arranged on the tank. Their operation, however, requires additional energy, and since the heat released by the heater ultimately heats the storage chamber, their operation also leads to longer compressor run times. The heater thus significantly affects the energy efficiency of the refrigerator.
  • Object of the present invention is to provide a refrigeration device with a recessed in a heat-insulating wall tank, in which a supercooling of the tank can be avoided without the use of heating.
  • a refrigeration appliance in particular a household refrigeration appliance, with a heat-insulating wall defining a cooled storage chamber, a tank embedded in the wall and a conduit for a heat transfer fluid, part of which is arranged in thermal contact with the tank first heat exchanger forms, a shut-off is provided which is switchable between a circulation of the heat transfer fluid in the line permitting position and a circulation blocking position.
  • a second heat exchanger is arranged on an inner side of the heat-insulating wall.
  • it may, like a coldwall evaporator, be arranged between an inner skin and an insulation material layer of the heat-insulating wall.
  • the heat transfer fluid is a liquid, since it is able to transfer more heat energy than a gas with a small line cross-section and low flow velocity.
  • the heat exchanger therefore occupies significantly less space in a refrigerator than a conventional, working with air as a heat transfer heat exchanger, so that the usable volume of the refrigerator can be increased.
  • the first heat exchanger is preferably arranged on one of the bearing chamber side facing the tank. Thus, it is shielded from ambient heat by the tank itself by incoming ambient heat, and unnecessary heat input into the heat transfer fluid is avoided.
  • the conduit is a closed circuit, of which a second part forms a second heat exchanger arranged in thermal contact with the storage chamber.
  • An adhesion of the second heat exchanger to the inner skin favors the heat exchange with the storage chamber.
  • a pump may be arranged in the closed circuit.
  • Such a pump may suitably also serve as a shut-off member for preventing the circulation.
  • Particularly suitable for this purpose are pumps in which the driven elements completely fill the free cross-section of the circle, such as gear or rotary vane pumps, which blocked in the case of the stoppage of the movable elements of the cross-section of the circle and thereby the circulation is blocked.
  • a controllable valve can serve as a shut-off.
  • a control signal for such a valve and / or for the pump can be provided in particular by a thermostat control.
  • the shut-off member can also be formed by at least a portion of the second heat exchanger, which can be closed by freezing heat transfer fluid. By blocking the heat transfer fluid at too low a temperature, this closable section can also prevent excessive cooling of the tank, which could lead to the freezing of its contents.
  • the expansion of the water during freezing can be used by the shut-off member comprises a water-filled expandable chamber whose volume expansion during freezing at least narrows the cross-section of the conduit.
  • FIG. 1 shown in a schematic section refrigeration device has a heat-insulating body 1 and a door 2, which define an interior.
  • the interior is divided into a storage chamber 3, here a freezer compartment, and an evaporator chamber 4, in which an evaporator and a fan for circulating air between the evaporator chamber 4 and the storage chamber 3 are housed.
  • An icemaker 5 is arranged immediately below the evaporator chamber 4 in the storage chamber 3 in order to be able to be charged directly with cold air from the evaporator chamber 4.
  • a collecting container 6 is mounted, which catches ice pieces 5 produced by the icemaker.
  • a screw conveyor 7 at the bottom of the collecting container 6 serves to convey ice pieces to an outlet 8 at a door near the end of the collecting container. 6
  • a niche 12 in which a user can place a container to discharge ice from the sump 6 without opening the door 2.
  • An upper wall of the niche 12 lies below the outlet 8 of the collecting container 6. Through this wall extends a tubular or funnel-shaped passage, also referred to as an ice chute 9.
  • a movable flap 10 is arranged, which blocks the ice slide 9 airtight in the closed position, so that no hot air from the niche 12 can pass through the ice chute 9 in the storage chamber 3.
  • a water outlet 11 is arranged, via which a container placed in the niche 12 can also be filled with cold water from a tank 13.
  • the tank 13 is in a wall of the niche 12, here a rear wall, taken in and separated from both the niche 12 and the storage chamber 3 by a thermal barrier coating 14 so that the tank 13 in stationary operation, a temperature is set between the Temperature of the storage chamber 3 and the environment is located.
  • the tank 13 is connected via a through the door 2 and walls of the body 1 extending line 15 to a domestic water, not shown.
  • a solenoid valve 16 is opened in the line, so that cold water is displaced from the tank 13 by flowing from the domestic water line forth, relatively warm water. If this water could only transfer its heat to the storage chamber 3 via the thermal barrier coating 14, it would take a very long time before cold water can be tapped again. In order to avoid this, it is necessary to be able to intensify the heat exchange between the tank 13 and the storage chamber 3. If necessary, it must also be possible to stop this heat flow again to prevent freezing of the water in the tank 13.
  • a cold heat exchanger 17 is arranged on an inner side of the door 2 in close thermal contact with the storage chamber 3.
  • the cold heat exchanger 17 may have a line with a flattened, lying surface on the inner skin cross-section; Alternatively or additionally, an adhesive layer in a limited by the outer skin and a rounding of the pipeline gusset the area on which an intense heat exchange is possible to increase.
  • the freezing point of the heat transfer fluid is below the lowest setpoint temperature which can be set for the storage chamber 3, so that freezing of the heat transfer fluid in the cold heat exchanger 17 is precluded.
  • the heat transfer fluid may be, for example, a common antifreeze solution for use in automobile radiators.
  • the other, warm heat exchanger 18 is in contact with the tank 13.
  • the warm heat exchanger 18 is located here on a side facing the storage chamber 3 of the tank 13 to be isolated from the environment by the tank 13 itself and thus to avoid unnecessary heat absorption from the environment.
  • Fig. 2 shows an interior view of the door 2 according to a first embodiment of the invention.
  • the heat exchangers 17, 18 and connecting lines 19, 20 are in Fig. 2 shown in dashed lines, since they are not visible in reality. Rather, the cold heat exchanger 17 is enclosed above the niche 12 between the door inner skin covering the entire inner door surface and the thermal barrier coating 14, and between the warm heat exchanger 18 and the inner skin is in addition a part of the thermal barrier coating 14th
  • the heat exchangers 17, 18 and lines 19, 20 may be integrally formed of a pipe or hose made of metal or plastic, which in the case of Fig. 2 extends in vertically oriented meanders.
  • the two ends of the tube or hose are connected to the inlet and outlet of a pump 21 to form a closed circuit.
  • the pump 21 is shown here in the line 19, but could be placed anywhere in the heat transfer circuit 22, also within one of the heat exchanger 17, 18.
  • the pump 21 is connected to a temperature sensor 23, which is arranged on an upper side of the tank 13.
  • the temperature sensor 23 sets the pump 21 in motion when a high detected temperature or a rise in temperature suggests that fresh water has flowed from the house water line, and switches off the pump 21 as soon as a limit temperature of some degrees above 0 ° C is exceeded ,
  • the design of the pump 21 is chosen so that it blocks the circulation of heat transfer fluid through the heat exchangers 17, 18 in the off state.
  • a gear pump as a pump 21 into consideration.
  • a valve should be provided in the heat transfer circuit 22, which serves as a shut-off when the pump is switched off. Even so, a cooling of the tank 13 via the heat transfer medium 22 can be reliably prevented if the temperature of the water in the tank 13 is close to 0 ° C.
  • the meanders of the heat exchangers 17, 18 are oriented horizontally, the conduit 19 connects directly to the upper ends of the heat exchangers 17, 18, and the conduit 20 connects directly to the lower ends thereof.
  • This asymmetry favors a purely convection-driven circulation of the heat transfer fluid in the circuit 22.
  • a via a temperature sensor on the tank 13 controlled valve 24 acts as a shut-off, which prevents the circulation of the heat transfer fluid at low temperature of the tank 13.
  • the valve 24 is shown in the conduit 19, but could be positioned at any other location in the circuit 22.
  • Fig. 4 shows a section of the door 2, which separates the tank 13 from the storage chamber 3, according to a third embodiment of the invention.
  • the freezing point of the heat transfer fluid is in this embodiment below 0 ° C, but above the temperature of the storage chamber 3, and accordingly the cold heat exchanger 17 is here separated from the storage chamber 3 by a thin layer of thermal insulation material, which prevents freezing of the heat transfer fluid in the heat exchanger 17 ,
  • a heat-conducting body 25 is embedded, with one end to the inner skin 26 of the door, with the other end to the top of the tank 13 rests and has a passage through which the heat transfer circuit 22, here again the line 19, runs.
  • the cross section of the heat conducting body 25 is small in relation to the surface of the tank 13; accordingly, its influence on the temperature of the tank 13 is negligible.
  • the passage forms a bottleneck 27 of the circuit 22.
  • the surfaces of the heat-conducting body 25 delimiting the bottleneck 27 assume a temperature between that of the storage chamber 3 and that of the tank 13.
  • the freezing point of the circulating in the heat transfer medium 22 heat transfer fluid is chosen so that the adjacent to the bottleneck 27 surface of the heat conducting body 25 falls below this temperature when the temperature of the tank 13 is just above 0 ° C.
  • the layer 28 of solidified heat transfer fluid which forms in this case in the bottleneck 27, constricts the bottleneck 27 in addition. This reduces the flow rate of the heat transfer fluid, which further promotes the growth of the layer 28.
  • Fig. 5 shows you one Fig. 4 analog section according to another embodiment of the invention.
  • a heat-conducting body 25 is arranged between the inner skin 26 and the tank 13.
  • the heat conducting body 25 contains here on its side facing the bearing chamber 3 side a water-filled and closed with a movable piston 30 chamber 29.
  • the contents of the chamber 29 freezes and drives the piston 30 into the bottleneck 27 inside , so that the circulation of the heat transfer fluid preferably comes to a complete stop, but at least severely limited, to prevent freezing of the tank 13.

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

Description

Die vorliegende Erfindung betrifft ein Kältegerät, insbesondere ein Haushaltskältegerät, mit einer eine gekühlte Lagerkammer begrenzenden wärmedämmenden Wand und einem in die Wand eingelassenen Tank. Derartige Tanks sind zur Versorgung eines Kaltwasserspenders in Haushaltskältegeräten weit verbreitet.The present invention relates to a refrigeration appliance, in particular a domestic refrigeration appliance, with a heat-insulating wall delimiting a cooled storage chamber and a tank embedded in the wall. Such tanks are widely used to supply a cold water dispenser in household refrigerators.

Wenn ein solcher Tank mit Wasser gefüllt ist, darf seine Temperatur nicht unter 0°C abfallen, zum einen, weil die mit dem Gefrieren des Wassers einhergehende Ausdehnung den Tank beschädigen und/oder eine an den Tank angrenzende Isoliermaterialschicht verdichten und damit ihr Wärmedämmvermögen beeinträchtigen kann, zum anderen, weil, wenn der Inhalt des Tanks gefroren ist, kein kaltes Wasser mehr abgezapft werden kann. Wenn die Lagerkammer, in deren Wand der Tank angeordnet ist, für einen Betrieb bei Temperaturen unter 0°C ausgelegt ist, müssen daher geeignete Maßnahmen getroffen werden, um ein Gefrieren des Tanks sicher zu unterbinden.If such a tank is filled with water, its temperature must not fall below 0 ° C, first, because the expansion of the water accompanying expansion damage the tank and / or compress an adjacent to the tank layer of insulating material and thus affect their thermal insulation capacity and second, because when the contents of the tank are frozen, cold water can no longer be tapped off. If the storage chamber with the tank in the wall is designed for operation below 0 ° C, appropriate measures must be taken to ensure that the tank does not freeze.

Aus DE 10 2006 052 554 A1 ist ein Kältegerät mit in die Rückwand einer Spendernische integriertem Wassertank bekannt, bei dem an einer Seite des Tanks luftführende Leitungen ausgespart sind, die über einen Durchgang in der Isoliermaterialschicht der Wand mit der Lagerkammer kommunizieren. Diese Leitungen fungieren als ein den Tank kühlender Wärmetauscher, der die Luft der Lagerkammer als Wärmeträgerfluid verwendet. Die geringe Wärmekapazität der Luft macht zum einen einen Ventilator erforderlich, um unter normalen Betriebsbedingungen für eine zum Kühlen des Tanks ausreichende Luftzirkulation zu sorgen. Zum anderen muss, damit diese Luft geräuscharm bei niedriger Geschwindigkeit zirkulieren kann, der Querschnitt der Leitungen groß sein, und infolge des knappen Einbauraums ist die Länge der Leitungen gering. Die Kombination von geringer Leitungslänge und großem Querschnitt führt dazu, dass die Luft durch den Wärmetauscher auch dann zirkuliert, wenn der Ventilator nicht im Betrieb ist.Out DE 10 2006 052 554 A1 is a refrigeration device with integrated into the rear wall of a dispenser water tank known, in which on one side of the tank air-conveying lines are recessed, which communicate via a passage in the insulating material layer of the wall with the storage chamber. These conduits act as a tank cooling heat exchanger which uses the air of the storage chamber as the heat transfer fluid. The low heat capacity of the air requires a fan to provide sufficient air circulation to cool the tank under normal operating conditions. On the other hand, in order for this air to circulate quietly at low speed, the cross-section of the lines must be large and, due to the tight installation space, the length of the lines is small. The combination of small length and large cross-section means that the air circulates through the heat exchanger even when the fan is not in operation.

Die US 4,866,949 offenbart ein Kältegerät mit einer Ausgabe an einer Fronttür für eine gekühlte karbonisierte Flüssigkeit wie Wasser oder Getränke. In der Fronttür ist ein Karbonisierer vorgesehen, welcher durch eine Verdampfungseinheit gekühlt wird. Die Verdampfungseinheit steht mit einer Verflüssigungseinheit in Verbindung, welche im Gefrierfach angeordnet ist.The US 4,866,949 discloses a refrigerator having an output on a front door for a refrigerated carbonated liquid such as water or drinks. In the front door, a carbonator is provided, which is cooled by an evaporation unit. The Evaporation unit communicates with a liquefaction unit which is arranged in the freezer compartment.

Die US 2009/0260371 A1 offenbart ein Kältegerät mit einem ersten und einen zweiten Kältekreislauf auszustatten, wobei der zweite Kältekreislauf 52 durch einen Koppler 72 des ersten Kältekreislaufs 30 mit thermischer Energie versorgt wird.The US 2009/0260371 A1 discloses a refrigeration device with a first and a second refrigeration cycle equip, the second refrigeration cycle 52 is supplied by a coupler 72 of the first refrigeration cycle 30 with thermal energy.

Die US 3,908,394 B offenbart ein Kältegerät mit einem Ventil und einem Rohrsystem für die Getränkeausgabe. In dem Rohrsystem befindet sich gefrorenes Eis. Wird das Ventil geöffnet, weitet sich Rohrsystem durch den Wasserdruck auf und das am gefrorenen Eis 44 vorbeiströmende Wasser wird gekühlt.The US 3,908,394 B discloses a refrigerator with a valve and a piping system for beverage dispensing. The pipe system contains frozen ice. When the valve is opened, the pipe system expands due to the water pressure and the water flowing past the frozen ice 44 is cooled.

Die WO 2010/034330 A1 offenbart einen Getränkekühler mit einem Kühlbehälter, der einen Einlass und einen Auslass aufweist, um Getränke zum und vom Kühlbehälter zu fördern. Durch den Kühlbehälter ist ein Kühlrohr geführt, um das Getränk im Kühlbehälter zu kühlen.The WO 2010/034330 A1 discloses a beverage cooler having a cooling vessel having an inlet and an outlet for conveying drinks to and from the cooling vessel. Through the cooling tank, a cooling pipe is guided to cool the drink in the cooling tank.

Die DE 10 2005 014 742 A1 offenbart eine Vorrichtung zum Kühlen von Getränken mit einem aus Phasenwechselmaterial enthaltenden Kältespeicher auszustatten. Der Kältespeicher kann in einer Wandung oder innerhalb des Innenraums der Schockkühleinrichtung angeordnet sein. Durch den Kältespeicher ist eine Leitung für eine zu kühlende Flüssigkeit hindurchgeführt.
Die US 2,709,343 offenbart ein Kältegerät mit einem am Eistank angebrachten Verdampfer, wobei der Verdampfer den Kühlraum und den Eistank kühlt. Ein Verflüssiger ist im Maschinenraum des Kältegerätes angeordnet.The DE 10 2005 014 742 A1 discloses a device for cooling drinks with a phase change material containing cold storage equip. The cold storage can be arranged in a wall or within the interior of the shock cooling device. Through the cold storage a pipe is passed for a liquid to be cooled.
The US 2,709,343 discloses a refrigerator with an attached to the ice tank evaporator, wherein the evaporator cools the refrigerator and the ice tank. A condenser is arranged in the engine room of the refrigerator.

Um sicherzustellen, dass dies bei einer niedrigen Solltemperatur des Lagerfachs und niedriger Außentemperatur nicht zum Gefrieren des Tankinhalts führt, ist an dem Tank zusätzlich eine elektrische Heizung angeordnet. Deren Betrieb erfordert jedoch zusätzliche Energie, und da die von der Heizung freigesetzte Wärme letztlich die Lagerkammer aufheizt, führt ihr Betrieb auch zu längeren Verdichterlaufzeiten. Die Heizung beeinträchtigt somit erheblich die Energieeffizienz des Kältegeräts.To ensure that this does not lead to freezing of the tank contents at a low target temperature of the storage compartment and low outside temperature, an electric heater is additionally arranged on the tank. Their operation, however, requires additional energy, and since the heat released by the heater ultimately heats the storage chamber, their operation also leads to longer compressor run times. The heater thus significantly affects the energy efficiency of the refrigerator.

Aufgabe der vorliegenden Erfindung ist, ein Kältegerät mit einem in eine wärmedämmende Wand eingelassenen Tank anzugeben, bei dem eine Unterkühlung des Tanks ohne den Einsatz einer Heizung vermieden werden kann.Object of the present invention is to provide a refrigeration device with a recessed in a heat-insulating wall tank, in which a supercooling of the tank can be avoided without the use of heating.

Die Aufgabe wird gelöst, indem bei einem Kältegerät, insbesondere einem Haushaltskältegerät, mit einer eine gekühlte Lagerkammer begrenzenden wärmedämmenden Wand, einem in die Wand eingelassenen Tank und einer Leitung für ein Wärmeträgerfluid, von der ein Teil einen in thermischem Kontakt mit dem Tank angeordneten ersten Wärmetauscher bildet, ein Absperrelement vorgesehen ist, das zwischen einer die Zirkulation des Wärmeträgerfluids in der Leitung zulassenden Stellung und einer die Zirkulation sperrenden Stellung umschaltbar ist.The object is achieved by providing in a refrigeration appliance, in particular a household refrigeration appliance, with a heat-insulating wall defining a cooled storage chamber, a tank embedded in the wall and a conduit for a heat transfer fluid, part of which is arranged in thermal contact with the tank first heat exchanger forms, a shut-off is provided which is switchable between a circulation of the heat transfer fluid in the line permitting position and a circulation blocking position.

Erfindungsgemäß ist ein zweite Wärmetauscher an einer Innenseite der wärmedämmenden Wand angeordnet. Insbesondere kann er, ähnlich einem Coldwall-Verdampfer, zwischen einer Innenhaut und einer Isolationsmaterialschicht der wärmedämmenden Wand angeordnet sein.According to the invention, a second heat exchanger is arranged on an inner side of the heat-insulating wall. In particular, it may, like a coldwall evaporator, be arranged between an inner skin and an insulation material layer of the heat-insulating wall.

Vorzugsweise ist das Wärmeträgerfluid eine Flüssigkeit, da diese in der Lage ist, bei geringem Leitungsquerschnitt und niedriger Strömungsgeschwindigkeit mehr Wärmeenergie zu übertragen als ein Gas. Der Wärmetauscher belegt daher deutlich weniger Platz in einem Kältegerät als ein herkömmlicher, mit Luft als Wärmeträger arbeitender Wärmetauscher, so dass das nutzbare Volumen des Kältegeräts vergrößert werden kann.Preferably, the heat transfer fluid is a liquid, since it is able to transfer more heat energy than a gas with a small line cross-section and low flow velocity. The heat exchanger therefore occupies significantly less space in a refrigerator than a conventional, working with air as a heat transfer heat exchanger, so that the usable volume of the refrigerator can be increased.

Der erste Wärmetauscher ist vorzugsweise an einer der Lagerkammer zugewandten Seite des Tanks angeordnet. So ist er gegenüber durch den Tank selber hindurch zuströmender Umgebungswärme abgeschirmt, und ein unnötiger Wärmeeintrag in das Wärmeträgerfluid wird vermieden.The first heat exchanger is preferably arranged on one of the bearing chamber side facing the tank. Thus, it is shielded from ambient heat by the tank itself by incoming ambient heat, and unnecessary heat input into the heat transfer fluid is avoided.

Wenn das Wärmeträgerfluid eine Flüssigkeit ist, kann es nicht unmittelbar aus der Lagerkammer angesaugt und in diese wieder entlassen werden. Vorzugsweise ist daher die Leitung ein geschlossener Kreis, von der ein zweiter Teil einen in thermischem Kontakt mit der Lagerkammer angeordneten zweiten Wärmetauscher bildet.If the heat transfer fluid is a liquid, it can not be sucked directly from the storage chamber and released into it. Preferably, therefore, the conduit is a closed circuit, of which a second part forms a second heat exchanger arranged in thermal contact with the storage chamber.

Eine Verklebung des zweiten Wärmetauschers an der Innenhaut begünstigt den Wärmeaustausch mit der Lagerkammer.An adhesion of the second heat exchanger to the inner skin favors the heat exchange with the storage chamber.

Wenn der zweite Wärmetauscher oberhalb des ersten Wärmetauschers angeordnet ist, kann Konvektion, die durch Abkühlung des Wärmeträgerfluids im zweiten Wärmetauscher angeregt wird, den Wärmetransport in dem Kreis fördern, ohne dass hierfür zusätzlich Antriebsenergie aufgewandt werden muss.If the second heat exchanger is arranged above the first heat exchanger, convection, which is excited by cooling of the heat transfer fluid in the second heat exchanger, promote the heat transport in the circuit, without this additional energy must be expended.

Um die Zirkulation des Wärmeträgerfluids zu steuern, kann in dem geschlossenen Kreis auch eine Pumpe angeordnet sein.In order to control the circulation of the heat transfer fluid, a pump may be arranged in the closed circuit.

Eine solche Pumpe kann zweckmäßigerweise auch als Absperrglied zum Unterbinden der Zirkulation dienen. Besonders geeignet hierfür sind Pumpen, bei denen die angetriebenen Elemente den freien Querschnitt des Kreises komplett ausfüllen, wie etwa Zahnrad- oder Drehschieberpumpen, bei denen im Falle des Stillstands der beweglichen Elemente der Querschnitt des Kreises blockiert und dadurch die Zirkulation gesperrt ist.Such a pump may suitably also serve as a shut-off member for preventing the circulation. Particularly suitable for this purpose are pumps in which the driven elements completely fill the free cross-section of the circle, such as gear or rotary vane pumps, which blocked in the case of the stoppage of the movable elements of the cross-section of the circle and thereby the circulation is blocked.

Alternativ kann auch ein ansteuerbares Ventil als Absperrglied dienen.Alternatively, a controllable valve can serve as a shut-off.

Ein Steuersignal für ein solches Ventil und/oder für die Pumpe kann insbesondere von einer Thermostatregelung bereitgestellt werden.A control signal for such a valve and / or for the pump can be provided in particular by a thermostat control.

Wenn das Lagerfach auf eine Solltemperatur unter dem Gefrierpunkt des Wärmeträgerfluids abkühlbar ist, kann das Absperrglied auch durch wenigstens einen Abschnitt des zweiten Wärmetauschers gebildet sein, der durch gefrierendes Wärmeträgerfluid verschließbar ist. Indem bei zu niedriger Temperatur das Wärmeträgerfluid diesen verschließbaren Abschnitt blockiert, kann ebenfalls eine übermäßige Kühlung des Tanks, die zum Gefrieren von dessen Inhalt führen könnte, unterbunden werden.If the storage compartment can be cooled to a setpoint temperature below the freezing point of the heat carrier fluid, the shut-off member can also be formed by at least a portion of the second heat exchanger, which can be closed by freezing heat transfer fluid. By blocking the heat transfer fluid at too low a temperature, this closable section can also prevent excessive cooling of the tank, which could lead to the freezing of its contents.

Noch einer Alternative zu Folge kann die Ausdehnung des Wassers beim Gefrieren genutzt werden, indem das Absperrglied eine wassergefüllte dehnbare Kammer umfasst, deren Volumenausdehnung beim Gefrieren den Querschnitt der Leitung wenigstens verengt.Yet another alternative to consequence, the expansion of the water during freezing can be used by the shut-off member comprises a water-filled expandable chamber whose volume expansion during freezing at least narrows the cross-section of the conduit.

Weitere Merkmale und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung von Ausführungsbeispielen unter Bezugnahme auf die beigefügten Figuren. Es zeigen:

Fig. 1
einen schematischen Schnitt durch ein erfindungsgemäßes Kältegerät;
Fig. 2
den Verlauf einer Wärmeträgerleitung an der Innenseite der Tür des Kältegeräts gemäß einer ersten Ausgestaltung der Erfindung;
Fig. 3
den Verlauf der Wärmeträgerleitung gemäß einer zweiten Ausgestaltung in einer zu Fig. 2 analogen Darstellung;
Fig. 4
ein vergrößertes Detail der wärmedämmenden Wand des Kältegeräts im Schnitt gemäß einer dritten Ausgestaltung; und
Fig. 5
einen zu Fig. 4 analogen Schnitt gemäß einer vierten Ausgestaltung.
Further features and advantages of the invention will become apparent from the following description of embodiments with reference to the accompanying figures. Show it:
Fig. 1
a schematic section through an inventive refrigerator;
Fig. 2
the course of a heat carrier line on the inside of the door of the refrigerator according to a first embodiment of the invention;
Fig. 3
the course of the heat carrier line according to a second embodiment in a too Fig. 2 analog representation;
Fig. 4
an enlarged detail of the heat-insulating wall of the refrigerator in section according to a third embodiment; and
Fig. 5
one too Fig. 4 analog section according to a fourth embodiment.

Das in Fig. 1 in einem schematischen Schnitt gezeigte Kältegerät hat einen wärmeisolierenden Korpus 1 und eine Tür 2, die einen Innenraum begrenzen. Der Innenraum ist unterteilt in eine Lagerkammer 3, hier ein Gefrierfach, und eine Verdampferkammer 4, in der ein Verdampfer und ein Ventilator zum Umwälzen von Luft zwischen Verdampferkammer 4 und Lagerkammer 3 untergebracht sind.This in Fig. 1 shown in a schematic section refrigeration device has a heat-insulating body 1 and a door 2, which define an interior. The interior is divided into a storage chamber 3, here a freezer compartment, and an evaporator chamber 4, in which an evaporator and a fan for circulating air between the evaporator chamber 4 and the storage chamber 3 are housed.

Ein Eisbereiter 5 ist unmittelbar unterhalb der Verdampferkammer 4 in der Lagerkammer 3 angeordnet, um mit Kaltluft aus der Verdampferkammer 4 unmittelbar beaufschlagt werden zu können. Unter dem Eisbereiter 5 ist ein Sammelbehälter 6 angebracht, der vom Eisbereiter 5 erzeugte Eisstücke auffängt. Eine Förderschnecke 7 am Boden des Sammelbehälters 6 dient zum Fördern von Eisstücken zu einem Auslass 8 an einem türnahen Ende des Sammelbehälters 6.An icemaker 5 is arranged immediately below the evaporator chamber 4 in the storage chamber 3 in order to be able to be charged directly with cold air from the evaporator chamber 4. Under the icemaker 5 a collecting container 6 is mounted, which catches ice pieces 5 produced by the icemaker. A screw conveyor 7 at the bottom of the collecting container 6 serves to convey ice pieces to an outlet 8 at a door near the end of the collecting container. 6

In einem zentralen Bereich der Tür 2 ist eine Nische 12 gebildet, in der ein Benutzer einen Behälter platzieren kann, um Eis aus dem Sammelbehälter 6 darein ausgeben zu lassen, ohne dafür die Tür 2 zu öffnen. Eine obere Wand der Nische 12 liegt unter dem Auslass 8 des Sammelbehälters 6. Durch diese Wand erstreckt sich ein rohr- oder trichterförmiger Durchgang, auch als Eisrutsche 9 bezeichnet. Am unteren Ende der Eisrutsche 9 ist eine bewegliche Klappe 10 angeordnet, die in geschlossener Stellung die Eisrutsche 9 luftdicht versperrt, so dass keine Warmluft aus der Nische 12 durch die Eisrutsche 9 in die Lagerkammer 3 gelangen kann.In a central area of the door 2, there is formed a niche 12 in which a user can place a container to discharge ice from the sump 6 without opening the door 2. An upper wall of the niche 12 lies below the outlet 8 of the collecting container 6. Through this wall extends a tubular or funnel-shaped passage, also referred to as an ice chute 9. At the lower end of the ice chute 9, a movable flap 10 is arranged, which blocks the ice slide 9 airtight in the closed position, so that no hot air from the niche 12 can pass through the ice chute 9 in the storage chamber 3.

An einer Außenseite der Klappe 10 ist ein Wasserauslass 11 angeordnet, über den ein in der Nische 12 platzierter Behälter ferner mit kaltem Wasser aus einem Tank 13 befüllbar ist. Der Tank 13 ist in eine Wand der Nische 12, hier eine Rückwand, eingelassen und sowohl von der Nische 12 als auch von der Lagerkammer 3 durch eine Wärmedämmschicht 14 getrennt, so dass sich im Tank 13 im stationären Betrieb eine Temperatur einstellt, die zwischen der Temperatur der Lagerkammer 3 und der der Umgebung liegt.On an outer side of the flap 10, a water outlet 11 is arranged, via which a container placed in the niche 12 can also be filled with cold water from a tank 13. The tank 13 is in a wall of the niche 12, here a rear wall, taken in and separated from both the niche 12 and the storage chamber 3 by a thermal barrier coating 14 so that the tank 13 in stationary operation, a temperature is set between the Temperature of the storage chamber 3 and the environment is located.

Der Tank 13 ist über eine sich durch die Tür 2 und Wände des Korpus 1 erstreckende Leitung 15 an eine nicht dargestellte Hauswasserleitung angeschlossen. Wenn Wasser aus dem Tank 13 in einen Behälter der Nische 12 gezapft wird, wird ein Magnetventil 16 in der Leitung geöffnet, so dass kaltes Wasser aus dem Tank 13 durch von der Hauswasserleitung her nachfließendes, relativ warmes Wasser verdrängt wird. Wenn dieses Wasser seine Wärme nur über die Wärmedämmschicht 14 hinweg an die Lagerkammer 3 abgeben könnte, würde es sehr lange dauern, bis erneut kaltes Wasser abgezapft werden kann. Um dies zu vermeiden, ist es notwendig, den Wärmeaustausch zwischen dem Tank 13 und der Lagerkammer 3 intensivieren zu können. Bei Bedarf muss es aber auch möglich sein, diesen Wärmefluss wieder zu stoppen, um ein Gefrieren des Wassers im Tank 13 zu verhindern.The tank 13 is connected via a through the door 2 and walls of the body 1 extending line 15 to a domestic water, not shown. When water is tapped from the tank 13 into a container of the niche 12, a solenoid valve 16 is opened in the line, so that cold water is displaced from the tank 13 by flowing from the domestic water line forth, relatively warm water. If this water could only transfer its heat to the storage chamber 3 via the thermal barrier coating 14, it would take a very long time before cold water can be tapped again. In order to avoid this, it is necessary to be able to intensify the heat exchange between the tank 13 and the storage chamber 3. If necessary, it must also be possible to stop this heat flow again to prevent freezing of the water in the tank 13.

Zu diesem Zweck sind in der Tür 2 zwei Wärmetauscher 17, 18 in einem Wärmeträgerkreis 22 miteinander verbunden, in dem eine Wärmeträgerflüssigkeit zirkuliert. Einer von ihnen, hier auch als kalter Wärmetauscher 17 bezeichnet, ist an einer Innenseite der Tür 2 in engem thermischen Kontakt mit der Lagerkammer 3 angeordnet. Vorzugsweise ist er hinter einer in fachüblicher Weise aus Kunststoff tiefgezogenen Innenhaut der Tür 2 verborgen. Um einen schnellen Wärmeaustausch zu ermöglichen, kann der kalte Wärmetauscher 17 eine Leitung mit abgeflachtem, flächig an der Innenhaut anliegendem Querschnitt aufweisen; alternativ oder ergänzend kann eine Klebstoffschicht in einem von der Außenhaut und einer Rundung der Rohrleitung begrenzten Zwickel die Fläche, auf der ein intensiver Wärmeaustausch möglich ist, vergrößern. Der Gefrierpunkt der Wärmeträgerflüssigkeit liegt unterhalb der tiefsten für die Lagerkammer 3 einstellbaren Solltemperatur, so dass ein Einfrieren der Wärmeträgerflüssigkeit im kalten Wärmetauscher 17 ausgeschlossen ist. Die Wärmeträgerflüssigkeit kann z.B. eine für den Einsatz in Kraftfahrzeugkühlern gebräuchliche Frostschutzlösung sein.For this purpose, in the door 2, two heat exchangers 17, 18 in a heat transfer circuit 22 connected to each other, in which a heat transfer fluid circulated. One of them, also referred to here as a cold heat exchanger 17, is arranged on an inner side of the door 2 in close thermal contact with the storage chamber 3. Preferably, it is hidden behind a deep-drawn in a customary manner of plastic inner skin of the door 2. In order to enable a rapid heat exchange, the cold heat exchanger 17 may have a line with a flattened, lying surface on the inner skin cross-section; Alternatively or additionally, an adhesive layer in a limited by the outer skin and a rounding of the pipeline gusset the area on which an intense heat exchange is possible to increase. The freezing point of the heat transfer fluid is below the lowest setpoint temperature which can be set for the storage chamber 3, so that freezing of the heat transfer fluid in the cold heat exchanger 17 is precluded. The heat transfer fluid may be, for example, a common antifreeze solution for use in automobile radiators.

Der andere, warme Wärmetauscher 18 steht mit dem Tank 13 in Kontakt. Der warme Wärmetauscher 18 befindet sich hier an einer der Lagerkammer 3 zugewandten Seite des Tanks 13, um von der Umgebung durch den Tank 13 selbst isoliert zu sein und so eine unnötige Wärmeaufnahme aus der Umgebung zu vermeiden.The other, warm heat exchanger 18 is in contact with the tank 13. The warm heat exchanger 18 is located here on a side facing the storage chamber 3 of the tank 13 to be isolated from the environment by the tank 13 itself and thus to avoid unnecessary heat absorption from the environment.

Fig. 2 zeigt eine Innenansicht der Tür 2 gemäß einer ersten Ausgestaltung der Erfindung. Die Wärmetauscher 17, 18 und sie verbindende Leitungen 19, 20 sind in Fig. 2 gestrichelt dargestellt, da sie in der Realität nicht sichtbar sind. Vielmehr ist der kalte Wärmetauscher 17 oberhalb der Nische 12 zwischen der die gesamte Türinnenfläche überdeckenden Türinnenhaut und der Wärmedämmschicht 14 eingeschlossen, und zwischen dem warmen Wärmetauscher 18 und der Innenhaut liegt zusätzlich ein Teil der Wärmedämmschicht 14. Fig. 2 shows an interior view of the door 2 according to a first embodiment of the invention. The heat exchangers 17, 18 and connecting lines 19, 20 are in Fig. 2 shown in dashed lines, since they are not visible in reality. Rather, the cold heat exchanger 17 is enclosed above the niche 12 between the door inner skin covering the entire inner door surface and the thermal barrier coating 14, and between the warm heat exchanger 18 and the inner skin is in addition a part of the thermal barrier coating 14th

Die Wärmetauscher 17, 18 und Leitungen 19, 20 können einteilig zusammenhängend aus einem Rohr oder Schlauch aus Metall oder Kunststoff gebildet sein, das sich im Falle der Fig. 2 in vertikal orientierten Mäandern erstreckt. Die beiden Enden des Rohrs oder Schlauchs sind mit Ein- und Ausgang einer Pumpe 21 verbunden, um einen geschlossenen Kreislauf zu bilden. Die Pumpe 21 ist hier in der Leitung 19 dargestellt, könnte aber an beliebiger Stelle des Wärmeträgerkreises 22, auch innerhalb eines der Wärmetauscher 17, 18, platziert sein.The heat exchangers 17, 18 and lines 19, 20 may be integrally formed of a pipe or hose made of metal or plastic, which in the case of Fig. 2 extends in vertically oriented meanders. The two ends of the tube or hose are connected to the inlet and outlet of a pump 21 to form a closed circuit. The pump 21 is shown here in the line 19, but could be placed anywhere in the heat transfer circuit 22, also within one of the heat exchanger 17, 18.

Die Pumpe 21 ist mit einem Temperaturfühler 23 verbunden, der an einer Oberseite des Tanks 13 angeordnet ist. Der Temperaturfühler 23 setzt die Pumpe 21 in Gang, wenn eine hohe erfasste Temperatur oder ein Temperaturanstieg darauf schließen lässt, dass frisches Wasser aus der Hauswasserleitung zugeströmt ist, und schaltet die Pumpe 21 ab, sobald eine Grenztemperatur von einigen Grad über 0°C unterschritten ist.The pump 21 is connected to a temperature sensor 23, which is arranged on an upper side of the tank 13. The temperature sensor 23 sets the pump 21 in motion when a high detected temperature or a rise in temperature suggests that fresh water has flowed from the house water line, and switches off the pump 21 as soon as a limit temperature of some degrees above 0 ° C is exceeded ,

Die Bauart der Pumpe 21 ist so gewählt, dass sie in ausgeschaltetem Zustand die Zirkulation von Wärmeträgerflüssigkeit durch die Wärmetauscher 17, 18 blockiert. So kommt zum Beispiel eine Zahnradpumpe als Pumpe 21 in Betracht.The design of the pump 21 is chosen so that it blocks the circulation of heat transfer fluid through the heat exchangers 17, 18 in the off state. Thus, for example, a gear pump as a pump 21 into consideration.

Wenn z.B. eine Kreiselpumpe oder allgemein eine Pumpe verwendet wird, die im Stillstand den Wärmeträgerkreis 22 nicht sperrt, sollte in dem Wärmeträgerkreis 22 ein Ventil vorgesehen sein, das bei abgeschalteter Pumpe als Absperrglied dient. Auch so kann eine Abkühlung des Tanks 13 über den Wärmeträgerkreis 22 zuverlässig unterbunden werden, falls die Temperatur des Wassers im Tank 13 nahe 0°C liegt.If e.g. a centrifugal pump or a pump is generally used, which does not block the heat transfer circuit 22 at standstill, a valve should be provided in the heat transfer circuit 22, which serves as a shut-off when the pump is switched off. Even so, a cooling of the tank 13 via the heat transfer medium 22 can be reliably prevented if the temperature of the water in the tank 13 is close to 0 ° C.

In der Ausgestaltung der Fig. 3 sind die Mäander der Wärmetauscher 17, 18 horizontal orientiert, die Leitung 19 verbindet auf direktem Wege obere Enden der Wärmetauscher 17, 18, und die Leitung 20 verbindet auf direktem Wege deren untere Enden. Diese Asymmetrie begünstigt eine rein durch Konvektion angetriebene Umwälzung der Wärmeträgerflüssigkeit im Kreis 22. Ein über einen Temperaturfühler am Tank 13 angesteuertes Ventil 24 fungiert hier als Absperrglied, das bei niedriger Temperatur des Tanks 13 die Zirkulation der Wärmeträgerflüssigkeit unterbindet. Wiederum ist das Ventil 24 in der Leitung 19 gezeigt, könnte aber an beliebiger anderer Stelle im Kreis 22 positioniert sein.In the embodiment of Fig. 3 the meanders of the heat exchangers 17, 18 are oriented horizontally, the conduit 19 connects directly to the upper ends of the heat exchangers 17, 18, and the conduit 20 connects directly to the lower ends thereof. This asymmetry favors a purely convection-driven circulation of the heat transfer fluid in the circuit 22. A via a temperature sensor on the tank 13 controlled valve 24 acts as a shut-off, which prevents the circulation of the heat transfer fluid at low temperature of the tank 13. Again, the valve 24 is shown in the conduit 19, but could be positioned at any other location in the circuit 22.

Fig. 4 zeigt einen Ausschnitt aus der Tür 2, der den Tank 13 von der Lagerkammer 3 trennt, gemäß einer dritten Ausgestaltung der Erfindung. Der Gefrierpunkt der Wärmeträgerflüssigkeit liegt bei dieser Ausgestaltung unter 0°C, aber oberhalb der Temperatur der Lagerkammer 3, und dementsprechend ist der kalte Wärmetauscher 17 hier von der Lagerkammer 3 durch eine dünne Schicht Wärmedämmmaterial getrennt, die ein Gefrieren der Wärmeträgerflüssigkeit in dem Wärmetauscher 17 verhindert. In die Wärmedämmschicht 14, hier an der Oberseite der Nische 12, ist ein Wärmeleitkörper 25 eingebettet, der mit einem Ende an der Innenhaut 26 der Türe, mit dem anderen Ende an der Oberseite des Tanks 13 anliegt und einen Durchgang aufweist, durch den der Wärmeträgerkreis 22, hier wiederum die Leitung 19, verläuft. Der Querschnitt des Wärmeleitkörpers 25 ist klein im Verhältnis zur Oberfläche des Tanks 13; dementsprechend ist sein Einfluss auf die Temperatur des Tanks 13 vernachlässigbar. Der Durchgang bildet einen Engpass 27 des Kreises 22. Die den Engpass 27 begrenzenden Oberflächen des Wärmeleitkörpers 25 nehmen eine Temperatur zwischen der der Lagerkammer 3 und der des Tanks 13 an. Der Gefrierpunkt der in dem Wärmeträgerkreis 22 zirkulierenden Wärmeträgerflüssigkeit ist so gewählt, dass die an den Engpass 27 angrenzende Oberfläche des Wärmeleitkörpers 25 diese Temperatur unterschreitet, wenn die Temperatur des Tanks 13 knapp über 0°C liegt. Die Schicht 28 aus verfestigter Wärmeträgerflüssigkeit, die sich in diesem Fall im Engpass 27 bildet, verengt den Engpass 27 zusätzlich. Dadurch verringert sich die Strömungsgeschwindigkeit der Wärmeträgerflüssigkeit, was das Wachstum der Schicht 28 weiter begünstigt. Sobald diese den Engpass 27 verschließt, kommt auch hier der Wärmetransport zwischen den Wärmetauschern 17, 18 zum Erliegen, ohne dass es dafür eines Temperaturfühlers bedarf. Wenn Wasser abgezapft wird und warmes Wasser aus der Hauswasserleitung nachfließt, sammelt dieses sich in erster Linie im oberen Teil des Tanks 13 und erwärmt den Wärmeleitkörper 25, so dass die Schicht 28 schmilzt und der Wärmetransport wieder in Gang kommt. Eine Umschaltung zwischen einem offenen und einem gesperrten Zustand des Engpasses 27 erfolgt hier unmittelbar über die Temperaturen der Lagerkammer 3 und des Tanks 13 gesteuert, ohne einen Umweg über elektronische Regelkreise. Fig. 4 shows a section of the door 2, which separates the tank 13 from the storage chamber 3, according to a third embodiment of the invention. The freezing point of the heat transfer fluid is in this embodiment below 0 ° C, but above the temperature of the storage chamber 3, and accordingly the cold heat exchanger 17 is here separated from the storage chamber 3 by a thin layer of thermal insulation material, which prevents freezing of the heat transfer fluid in the heat exchanger 17 , In the thermal barrier coating 14, here at the top of the niche 12, a heat-conducting body 25 is embedded, with one end to the inner skin 26 of the door, with the other end to the top of the tank 13 rests and has a passage through which the heat transfer circuit 22, here again the line 19, runs. The cross section of the heat conducting body 25 is small in relation to the surface of the tank 13; accordingly, its influence on the temperature of the tank 13 is negligible. The passage forms a bottleneck 27 of the circuit 22. The surfaces of the heat-conducting body 25 delimiting the bottleneck 27 assume a temperature between that of the storage chamber 3 and that of the tank 13. The freezing point of the circulating in the heat transfer medium 22 heat transfer fluid is chosen so that the adjacent to the bottleneck 27 surface of the heat conducting body 25 falls below this temperature when the temperature of the tank 13 is just above 0 ° C. The layer 28 of solidified heat transfer fluid, which forms in this case in the bottleneck 27, constricts the bottleneck 27 in addition. This reduces the flow rate of the heat transfer fluid, which further promotes the growth of the layer 28. As soon as it closes off the bottleneck 27, here too the heat transfer between the heat exchangers 17, 18 stops, without the need for a temperature sensor. When water is tapped and hot water flows from the domestic water pipe, this collects primarily in the upper part of the tank 13 and heats the heat-conducting body 25, so that the layer 28 melts and the heat transport gets going again. A switchover between an open and a locked state of the bottleneck 27 takes place here directly controlled by the temperatures of the storage chamber 3 and the tank 13, without a detour via electronic control circuits.

Fig. 5 zeigt einen zu Fig. 4 analogen Schnitt gemäß einer weiteren Ausgestaltung der Erfindung. Wiederum ist ein Wärmeleitkörper 25 zwischen der Innenhaut 26 und dem Tank 13 angeordnet. Der Wärmeleitkörper 25 enthält hier an seiner der Lagerkammer 3 zugewandten Seite eine wassergefüllte und mit einem beweglichen Kolben 30 verschlossene Kammer 29. Bevor der Tank 13 auf 0°C abkühlt, gefriert der Inhalt der Kammer 29 und treibt den Kolben 30 in den Engpass 27 hinein, so dass die Zirkulation der Wärmeträgerflüssigkeit vorzugsweise vollständig zum Erliegen kommt, zumindest aber stark genug eingeschränkt wird, um ein Gefrieren des Tanks 13 zu verhindern. Fig. 5 shows you one Fig. 4 analog section according to another embodiment of the invention. Again, a heat-conducting body 25 is arranged between the inner skin 26 and the tank 13. The heat conducting body 25 contains here on its side facing the bearing chamber 3 side a water-filled and closed with a movable piston 30 chamber 29. Before the tank 13 cools to 0 ° C, the contents of the chamber 29 freezes and drives the piston 30 into the bottleneck 27 inside , so that the circulation of the heat transfer fluid preferably comes to a complete stop, but at least severely limited, to prevent freezing of the tank 13.

BEZUGSZEICHENREFERENCE NUMBERS

11
Korpuscorpus
22
Türdoor
33
Lagerkammerstorage chamber
44
Verdampferkammerevaporator chamber
55
EisbereiterIce makers
66
SammelbehälterClippings
77
FörderschneckeAuger
88th
Auslassoutlet
99
Eisrutscheice chute
1010
Klappeflap
1111
Wasserauslasswater outlet
1212
Nischeniche
1313
Tanktank
1414
Wärmedämmschichtthermal barrier
1515
Leitungmanagement
1616
Magnetventilmagnetic valve
1717
Wärmetauscherheat exchangers
1818
Wärmetauscherheat exchangers
1919
Leitungmanagement
2020
Leitungmanagement
2121
Pumpepump
2222
WärmeträgerkreisHeat transfer circuit
2323
Temperaturfühlertemperature sensor
2424
VentilValve
2525
Wärmeleitkörperthermal conductors
2626
Innenhautinner skin
2727
Engpassbottleneck
2828
Schichtlayer
2929
Kammerchamber
3030
Kolbenpiston

Claims (9)

  1. Refrigeration appliance, in particular a household refrigeration appliance, with a heat-insulating wall which delimits a cooled storage chamber (3), a reservoir (13) let into the wall and a conduit for a heat transfer medium fluid, part of which forms a first heat exchanger (18) arranged in thermal contact with the reservoir (13), and a shut-off element (21, 24, 27), which can be switched between a position that allows circulation of the heat transfer medium fluid in the conduit and a position that blocks circulation, and the conduit is a closed heat transfer medium circuit (22), a second part of which forms a second heat exchanger (17) arranged in thermal contact with the storage chamber (3), and the second heat exchanger (17) is arranged on an inner face of the heat-insulating wall, characterised in that the second heat exchanger (17) is arranged between an inner skin (26) and an insulating material layer (14) of the heat-insulating wall.
  2. Refrigeration appliance according to claim 1, characterised in that the heat transfer medium fluid is a liquid.
  3. Refrigeration appliance according to claim 1 or 2, characterised in that the first heat exchanger (18) is arranged on a face of the reservoir (13) facing the storage chamber (3).
  4. Refrigeration appliance according to claim 1, characterised in that the second heat exchanger (17) is arranged above the first heat exchanger (18).
  5. Refrigeration appliance according to one of claims 1 or 4, characterised in that a pump (21) is arranged in the closed heat transfer medium circuit (22).
  6. Refrigeration appliance according to claim 5, characterised in that the pump (21) forms the shut-off unit.
  7. Refrigeration appliance according to one of claims 1 to 6, characterised in that a controllable valve (24) forms the shut-off unit.
  8. Refrigeration appliance according to one of claims 1, 4, 5 or 6, characterised in that the storage compartment (3) can be cooled to a setpoint temperature below the freezing point of the heat transfer medium fluid and the shut-off unit is formed by at least one segment (27) of the heat transfer medium circuit (22), which can be closed off by freezing heat transfer medium fluid.
  9. Refrigeration appliance according to one of claims 1, 4 or 5, characterised in that the shut-off unit (27) comprises a water-filled expandable chamber (29).
EP15739280.4A 2014-07-23 2015-07-20 Refrigeration appliance comprising a fluid reservoir Active EP3172507B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014214322.5A DE102014214322A1 (en) 2014-07-23 2014-07-23 Refrigeration unit with liquid tank
PCT/EP2015/066557 WO2016012402A1 (en) 2014-07-23 2015-07-20 Refrigeration appliance comprising a fluid reservoir

Publications (2)

Publication Number Publication Date
EP3172507A1 EP3172507A1 (en) 2017-05-31
EP3172507B1 true EP3172507B1 (en) 2019-05-22

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EP15739280.4A Active EP3172507B1 (en) 2014-07-23 2015-07-20 Refrigeration appliance comprising a fluid reservoir

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US (1) US10126044B2 (en)
EP (1) EP3172507B1 (en)
DE (1) DE102014214322A1 (en)
TR (1) TR201908930T4 (en)
WO (1) WO2016012402A1 (en)

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US20180216865A1 (en) * 2017-01-27 2018-08-02 Louis C. Gonsalves Water exchange cooler
PL3537855T3 (en) * 2018-03-08 2023-08-21 MGI Digital Technology Method for manufacturing personalised chip-free radiofrequency identification (rfid) devices

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US3908394A (en) 1974-11-14 1975-09-30 Gen Electric Water-dispensing system
US4866949A (en) * 1988-11-15 1989-09-19 The Coca-Cola Company Carbonated liquid refrigeration system
DE102005014742A1 (en) 2004-09-27 2006-04-06 Aqamore Gmbh Device for cooling food
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DE102005057165A1 (en) * 2005-11-30 2007-05-31 BSH Bosch und Siemens Hausgeräte GmbH Method for cooling drinking water in a refrigeration appliance has a water storage tank around which the circulated air blown over the evaporator is passed controlled by a valve
DE102006040377A1 (en) * 2006-08-29 2008-03-06 BSH Bosch und Siemens Hausgeräte GmbH Refrigerating appliance with water tank
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WO2010034330A1 (en) 2008-09-26 2010-04-01 Electrolux Home Products Corporation N.V. A beverage cooler, a refrigerator comprising such a beverage cooler and a method for cooling beverage

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Also Published As

Publication number Publication date
TR201908930T4 (en) 2019-07-22
EP3172507A1 (en) 2017-05-31
WO2016012402A1 (en) 2016-01-28
US20170211873A1 (en) 2017-07-27
DE102014214322A1 (en) 2016-01-28
US10126044B2 (en) 2018-11-13

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