EP2821739B1 - Transportable cooling chamber - Google Patents

Transportable cooling chamber Download PDF

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Publication number
EP2821739B1
EP2821739B1 EP14176020.7A EP14176020A EP2821739B1 EP 2821739 B1 EP2821739 B1 EP 2821739B1 EP 14176020 A EP14176020 A EP 14176020A EP 2821739 B1 EP2821739 B1 EP 2821739B1
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EP
European Patent Office
Prior art keywords
cooling chamber
cooling
housing
chamber according
holding space
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EP14176020.7A
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German (de)
French (fr)
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EP2821739A3 (en
EP2821739A2 (en
Inventor
Helmut Dipl. Ing. Schumacher
Norbert Kesselmann
Willem Kruit
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Hupfer Metallwerke GmbH and Co KG
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Hupfer Metallwerke GmbH and Co KG
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Publication of EP2821739A3 publication Critical patent/EP2821739A3/en
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    • 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
    • F25D3/00—Devices using other cold materials; Devices using cold-storage bodies
    • F25D3/12—Devices using other cold materials; Devices using cold-storage bodies using solidified gases, e.g. carbon-dioxide snow
    • F25D3/125—Movable containers
    • 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
    • F25D3/00—Devices using other cold materials; Devices using cold-storage bodies
    • F25D3/02—Devices using other cold materials; Devices using cold-storage bodies using ice, e.g. ice-boxes
    • F25D3/06—Movable containers
    • 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
    • F25D2400/20—Carts specially adapted for transporting objects to be cooled

Definitions

  • the invention relates to a transportable cooling space according to the preamble of claim 1 with a housing and with a refrigerant reservoir for cooling a refrigerated goods receiving space within the housing.
  • the transportable cold room can be used, for example, to cool food and food distribution components or for the cooled transport of blood and medicines.
  • the term "transportable cold room” includes in particular tray transport trolleys for trays that are equipped with crockery components and dishes served on them, as well as mobile transport devices that are used, for example, in the context of food regeneration and food distribution and have a housing or a container with an interior to be cooled . In large kitchens, for example in hospitals, meals are often prepared and put together well in advance of consumption.
  • a transportable cold room whose refrigerant reservoir contains pourable ice, with used refrigerant being drained from the refrigerant reservoir in the form of melt water.
  • the filling space of the refrigerant reservoir consists of a vertical shaft and is arranged in a partition which divides the receiving space for the goods to be cooled into at least two areas.
  • the filling space of the refrigerant reservoir can contain a sieve insert, which the ice in a defined Holds altitude and lets melt water through.
  • the arrangement creates a cooling wall within the refrigerated goods receiving space, which extends from the bottom of the housing to the top of the housing and has a surface temperature predetermined by the ice or the ice / melt water mixture.
  • the cooling effect of the cooling wall is insufficient. A temperature stratification with an uneven temperature distribution from top to bottom sometimes occurs within the refrigerated goods receiving space.
  • Out FR 700 071 A a transportable cold room is known which is designed according to the preamble of claim 1.
  • the refrigerant reservoir is arranged above the refrigerated goods receiving space and, to improve the heat exchange, has a cooling body with cooling surfaces which extend along a wall surface into the bottom area of the refrigerated goods receiving space.
  • the cooling effect on the cooling surfaces creates natural convection and a circulation flow within the refrigerated goods receiving space.
  • a guide surface is provided within the filling material receiving space, which is arranged below the refrigerant reservoir.
  • the interior space of the housing that can be used as a space for accommodating refrigerated goods is restricted over the entire height by the arrangement and necessary dimensions of the cooling body. Furthermore, the cooling body arranged within a flow channel cannot be cleaned or can only be cleaned with difficulty.
  • a cooling space according to the preamble of claim 1 is known, in which two adjoining refrigerated goods receiving spaces are separated from each other by a partition, the partition having a guide surface via which a circulating free convection flow can be generated in the lower refrigerated goods receiving space.
  • the invention is based on the object of designing the transportable cooling space in such a way that a substantially constant temperature is established within the cooling goods receiving space.
  • the heat sink provided for this purpose should be designed in a structurally simple manner, have a structure that is as compact as possible and be easy to clean.
  • the subject matter of the invention and the solution to this problem is a transportable cold room according to claim 1.
  • the refrigerant reservoir is arranged above the refrigerated goods receiving space and has a cooling body protruding into the refrigerated goods receiving space to improve the heat exchange. Furthermore, a guide surface is provided for initiating and guiding a free convection flow circulating in the receiving space.
  • Free convection - also known as natural convection - is based on differences in density in the air space enclosed by the housing. Because of the cooling, air layers directly on the surface of the heat sink have a lower temperature and greater density than the room air within the cooling goods receiving space spaced apart from the heat sink. As a result, the air inside the refrigerated goods receiving space experiences a thermal lift, the guide surface directing the air flow based on natural convection. A circulation flow is created.
  • the cooling body is arranged above the guide surface and has an arrangement of several cooling ribs protruding into the cooling goods receiving space.
  • the circulating air sweeps along the cooling fins of the heat sink, is directed downwards along a thermally insulated wall surface of the housing and rises again on an opposite wall surface.
  • the guide surface is aligned essentially horizontally, with a slight inclination the circulation flow is stimulated and amplified much faster.
  • the guide surface is therefore an obliquely inclined flat surface, the angle of inclination to the horizontal being 0.5 to 10 degrees, preferably about 1 to 5 degrees.
  • the invention provides that the refrigerant reservoir has a tub for filling with pourable ice and that the cooling body is arranged on the underside of the tub and connected to the tub directly or indirectly through heat-conducting intermediate elements.
  • the housing can have a front door that is expediently thermally insulated.
  • the circulating free convection flow is established between a thermally insulated side wall of the housing and a thermally insulated front door.
  • side wall also includes, in particular, a rear wall of the housing.
  • the front door expediently extends over the entire height of the refrigerated goods receiving space.
  • Pourable ice which consists of water, can be used as the refrigerant for operating the device according to the invention.
  • crushed ice, ice cubes and flake ice can be used as pourable ice.
  • the heat sink can have additional heat transfer surfaces which extend into the interior of the tub. Used refrigerant is drained from the pan in the form of melt water.
  • a device for draining off melt water is connected to the tank. It is also within the scope of the invention that at least one side wall of the housing and / or a vertical partition wall within the receiving space has a channel for discharging melt water.
  • the tub for receiving the pourable ice can with a lid z. B. be closed with a removable lid or hinged lid.
  • the device according to the invention is not limited to operation with pourable ice consisting of water. Eutectic plates, pre-cooled ice packs or dry ice can also be used as a cooling source. In such configurations, the refrigerant reservoir has at least one compartment for pre-cooled eutectic plates or pre-cooled cooling packs or a tub for dry ice that can be closed with a cover.
  • the figures show a transportable cold room using the example of a tray transport trolley.
  • the tray transport trolley has a housing 1 with thermally insulated side walls 2 and a front door 3 that is likewise thermally insulated.
  • the tray transport trolley is also equipped with a refrigerant reservoir 4 for cooling a refrigerated goods receiving space 5 within the housing 1.
  • the housing 1 can be moved on rollers 6.
  • lateral support surfaces in the form of strips 7 for inserting trays 8 are provided.
  • the trays 8 maintain a distance from the side wall 2 of the housing and the inside of the door 3.
  • the free space stands for an in Fig. 1 indicated circulating air flow available.
  • the refrigerant reservoir 4 is arranged above the refrigerated goods receiving space 5 and has a cooling body 9 protruding into the refrigerated goods receiving space to improve the heat exchange.
  • a guide surface 10 for initiating and guiding a free convection flow circulating in the refrigerated goods receiving space 5 is also arranged below the cooling body 9.
  • the guide surface 10 consists of a guide plate and forms an obliquely inclined flat surface. The angle of inclination is about 1 to 5 degrees to the horizontal.
  • the guide plate 10 preferably maintains a distance of at least 30 mm to the side wall 2 or rear wall of the housing and to the inside of the door 3 in order not to hinder the circulation of the free convection flow.
  • the heat sink 9 is designed as a ribbed heat sink. It has an arrangement of several parallel cooling ribs 11 protruding into the refrigerated goods receiving space and is arranged on the underside of a trough 12, which is filled, for example, with pourable ice.
  • the tub 12 filled with pourable ice forms the refrigerant reservoir 4.
  • the cooling body 9 is connected to the tub 12 directly or indirectly through heat-conducting intermediate elements. Like the heat sink 9, this consists of a material with good thermal conductivity properties.
  • the tub 12 is made of sheet metal in the exemplary embodiment. As shown in Fig. 2 if the heat sink 9 has additional heat transfer surfaces 13, which extend into the interior of the trough 12, to improve the heat transfer.
  • the heat transfer surfaces 13 are designed as ribs, the distance between the ribs being selected to be sufficiently large so that the pourable ice 14 can fill the spaces between the ribs.
  • the tub 12 is expediently closed with a cover 15 and is also suitable for receiving dry ice as a refrigerant. If the tub is designed with a flat bottom surface, the tub can also be charged with pre-cooled ice packs or pre-cooled eutectic plates.
  • To the tub 12 can be in the Fig. 1 and 2 Not shown device for draining melt water be connected.
  • Fig. 3 has a vertical partition 16 within the refrigerated goods receiving space 5 on a channel 17 for draining melt water.
  • the channel for discharging melt water is arranged on or in a side wall 2 of the housing 1.

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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)
  • Chemical Kinetics & Catalysis (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)

Description

Die Erfindung betrifft einen transportablen Kühlraum gemäß dem Oberbegriff des Anspruches 1 mit einem Gehäuse und mit einem Kältemittelspeicher zur Kühlung eines Kühlgutaufnahmeraums innerhalb des Gehäuses. Der transportable Kühlraum kann beispielsweise zum Kühlen von Speisen und Speisenverteilkomponenten oder zum gekühlten Transport von Blutkonserven und Medikamenten eingesetzt werden. Der Begriff "transportabler Kühlraum" umfasst insbesondere Tablett-Transportwagen für Tabletts, die mit Geschirrkomponenten und darauf angerichteten Speisen bestückt sind, sowie fahrbare Transporteinrichtungen, die beispielsweise im Rahmen der Speisenregenerierung und Speisenverteilung Verwendung finden und ein Gehäuse oder ein Behältnis mit einem zu kühlenden Innenraum aufweisen.
In Großküchenbetrieben, beispielsweise in Krankenhäusern, werden die Mahlzeiten häufig weit vor dem Verzehrzeitpunkt zubereitet und zusammengestellt. Von diesem Zeitpunkt an müssen sie bis zum Verzehr kühl gelagert werden. Für einen Transport von der Küche bis zum Ort der Speisenausgabe werden Transportwagen eingesetzt, deren Wageninnenraum gekühlt wird. Zur Kühlung werden häufig passive Systeme mit einem Kältemittelspeicher verwendet.The invention relates to a transportable cooling space according to the preamble of claim 1 with a housing and with a refrigerant reservoir for cooling a refrigerated goods receiving space within the housing. The transportable cold room can be used, for example, to cool food and food distribution components or for the cooled transport of blood and medicines. The term "transportable cold room" includes in particular tray transport trolleys for trays that are equipped with crockery components and dishes served on them, as well as mobile transport devices that are used, for example, in the context of food regeneration and food distribution and have a housing or a container with an interior to be cooled .
In large kitchens, for example in hospitals, meals are often prepared and put together well in advance of consumption. From this point on, they must be stored in a cool place until they are eaten. For a transport from the kitchen to the place where the food is served, trolleys are used, the interior of which is cooled. Passive systems with a refrigerant reservoir are often used for cooling.

Aus EP 2 420 768 A2 ist ein transportabler Kühlraum bekannt, dessen Kältemittelspeicher schüttfähiges Eis enthält, wobei verbrauchtes Kältemittel in Form von Schmelzwasser aus dem Kältemittelspeicher abgelassen wird. Der Füllraum des Kältemittelspeichers besteht aus einem vertikalen Schacht und ist in einer Zwischenwand, welche den Aufnahmeraum für das Kühlgut in mindestens zwei Bereiche unterteilt, angeordnet. Dabei kann der Füllraum des Kältemittelspeichers einen Siebeinsatz enthalten, welcher das Eis in definierter Höhe hält und Schmelzwasser durchlässt. Durch die Anordnung wird innerhalb des Kühlgutaufnahmeraums eine Kühlwand geschaffen, welche sich vom Boden des Gehäuses bis zum oberseitigen Abschluss des Gehäuses erstreckt und eine durch das Eis bzw. das Eis-/Schmelzwassergemisch vorgegebene Oberflächentemperatur aufweist. Die Kühlwirkung der Kühlwand ist unzureichend. Innerhalb des Kühlgutaufnahmeraums stellt sich bisweilen eine Temperaturschichtung mit einer ungleichmäßigen Temperaturverteilung von oben nach unten ein.
Aus FR 700 071 A ist ein transportabler Kühlraum bekannt, der entsprechend dem Oberbegriff des Patentanspruches 1 ausgebildet ist. Der Kältemittelspeicher ist oberhalb des Kühlgutaufnahmeraumes angeordnet und weist zur Verbesserung des Wärmeaustausches einen Kühlkörper mit Kühlflächen auf, die sich entlang einer Wandfläche bis in den Bodenbereich des Kühlgutaufnahmeraums erstrecken. Durch die Kühlwirkung an den Kühlflächen entsteht eine natürliche Konvektion und innerhalb des Kühlgutaufnahmeraums eine Zirkulationsströmung. Zur Initiierung und Führung der freien Konvektionsströmung ist innerhalb des Füllgutaufnahmeraums eine Leitfläche vorgesehen, die unterhalb des Kältemittelspeichers angeordnet ist. Nachteilig ist, dass der als Kühlgutaufnahmeraum nutzbare Innenraum des Gehäuses durch die Anordnung und notwendigen Abmessungen des Kühlkörpers über die gesamte Höhe eingeschränkt ist. Ferner lässt sich der innerhalb eines Strömungskanals angeordnete Kühlkörper nicht oder nur schlecht reinigen.Out EP 2 420 768 A2 a transportable cold room is known whose refrigerant reservoir contains pourable ice, with used refrigerant being drained from the refrigerant reservoir in the form of melt water. The filling space of the refrigerant reservoir consists of a vertical shaft and is arranged in a partition which divides the receiving space for the goods to be cooled into at least two areas. The filling space of the refrigerant reservoir can contain a sieve insert, which the ice in a defined Holds altitude and lets melt water through. The arrangement creates a cooling wall within the refrigerated goods receiving space, which extends from the bottom of the housing to the top of the housing and has a surface temperature predetermined by the ice or the ice / melt water mixture. The cooling effect of the cooling wall is insufficient. A temperature stratification with an uneven temperature distribution from top to bottom sometimes occurs within the refrigerated goods receiving space.
Out FR 700 071 A a transportable cold room is known which is designed according to the preamble of claim 1. The refrigerant reservoir is arranged above the refrigerated goods receiving space and, to improve the heat exchange, has a cooling body with cooling surfaces which extend along a wall surface into the bottom area of the refrigerated goods receiving space. The cooling effect on the cooling surfaces creates natural convection and a circulation flow within the refrigerated goods receiving space. To initiate and guide the free convection flow, a guide surface is provided within the filling material receiving space, which is arranged below the refrigerant reservoir. It is disadvantageous that the interior space of the housing that can be used as a space for accommodating refrigerated goods is restricted over the entire height by the arrangement and necessary dimensions of the cooling body. Furthermore, the cooling body arranged within a flow channel cannot be cleaned or can only be cleaned with difficulty.

Aus der US 2,263,522 ist ein Kühlraum gemäß dem Oberbegriff des Anspruchs 1 bekannt, bei dem zwei aneinander grenzende Kühlgutaufnahmeräume über ein Trennblech voneinander getrennt werden, wobei das Trennblech eine Leitfläche aufweist, über die eine zirkulierende freie Konvektionsströmung in dem unteren Kühlgutaufnahmeraum erzeugt werden kann.From the U.S. 2,263,522 a cooling space according to the preamble of claim 1 is known, in which two adjoining refrigerated goods receiving spaces are separated from each other by a partition, the partition having a guide surface via which a circulating free convection flow can be generated in the lower refrigerated goods receiving space.

Vor diesem Hintergrund liegt der Erfindung die Aufgabe zugrunde, den transportablen Kühlraum so zu gestalten, dass sich innerhalb des Kühlgutaufnahmeraums eine im Wesentlichen konstante Temperatur einstellt. Der dazu vorgesehene Kühlkörper soll konstruktiv einfach gestaltet sein, einen möglichst kompakten Aufbau aufweisen und leicht zu reinigen sein.
Gegenstand der Erfindung und Lösung dieser Aufgabe ist ein transportabler Kühlraum nach Anspruch 1.Against this background, the invention is based on the object of designing the transportable cooling space in such a way that a substantially constant temperature is established within the cooling goods receiving space. The heat sink provided for this purpose should be designed in a structurally simple manner, have a structure that is as compact as possible and be easy to clean.
The subject matter of the invention and the solution to this problem is a transportable cold room according to claim 1.

Der Kältemittelspeicher ist oberhalb des Kühlgutaufnahmeraums angeordnet und weist einen in den Kühlgutaufnahmeraum vorstehenden Kühlkörper zur Verbesserung des Wärmeaustausches auf. Ferner ist eine Leitfläche zur Initiierung und Führung einer im Aufnahmeraum zirkulierenden freien Konvektionsströmung vorgesehen. Die freie Konvektion - auch als natürliche Konvektion bezeichnet - beruht auf Dichteunterschieden in dem von dem Gehäuse eingeschlossenen Luftraum. Luftschichten unmittelbar an der Oberfläche des Kühlkörpers weisen aufgrund der Kühlung eine geringere Temperatur und größere Dichte auf als die Raumluft innerhalb des von dem Kühlkörper beabstandeten Kühlgutaufnahmeraums. Dadurch erfährt die Luft innerhalb des Kühlgutaufnahmeraums einen thermischen Auftrieb, wobei die Leitfläche die auf einer natürlichen Konvektion basierende Luftströmung richtet. Es entsteht eine Zirkulationsströmung. Der Kühlkörper ist oberhalb der Leitfläche angeordnet und weist eine Anordnung aus mehreren in den Kühlgutaufnahmeraum vorstehenden Kühlrippen auf. Die zirkulierende Luft streicht an den Kühlrippen des Kühlkörpers entlang, ist entlang einer wärmegedämmten Wandfläche des Gehäuses nach unten gerichtet ist und steigt an einer gegenüberliegenden Wandfläche wieder auf. Die Leitfläche ist im Wesentlichen horizontal ausgerichtet, wobei durch eine leichte Schrägstellung der Leitfläche die Zirkulationsströmung wesentlich schneller angeregt und verstärkt wird. Gemäß einer bevorzugten Ausführung der Erfindung ist die Leitfläche daher eine schräg geneigte ebene Fläche, wobei der Neigungswinkel zur Horizontalen 0,5 bis 10 Grad, vorzugsweise etwa 1 bis 5 Grad beträgt.The refrigerant reservoir is arranged above the refrigerated goods receiving space and has a cooling body protruding into the refrigerated goods receiving space to improve the heat exchange. Furthermore, a guide surface is provided for initiating and guiding a free convection flow circulating in the receiving space. Free convection - also known as natural convection - is based on differences in density in the air space enclosed by the housing. Because of the cooling, air layers directly on the surface of the heat sink have a lower temperature and greater density than the room air within the cooling goods receiving space spaced apart from the heat sink. As a result, the air inside the refrigerated goods receiving space experiences a thermal lift, the guide surface directing the air flow based on natural convection. A circulation flow is created. The cooling body is arranged above the guide surface and has an arrangement of several cooling ribs protruding into the cooling goods receiving space. The circulating air sweeps along the cooling fins of the heat sink, is directed downwards along a thermally insulated wall surface of the housing and rises again on an opposite wall surface. The guide surface is aligned essentially horizontally, with a slight inclination the circulation flow is stimulated and amplified much faster. According to a preferred embodiment of the invention, the guide surface is therefore an obliquely inclined flat surface, the angle of inclination to the horizontal being 0.5 to 10 degrees, preferably about 1 to 5 degrees.

Bei einem solchen transportablen Kühlraum ist erfindungsgemäß vorgesehen, dass der Kältemittelspeicher eine Wanne zur Befüllung mit schüttfähigem Eis aufweist und dass der Kühlkörper an der Unterseite der Wanne angeordnet und mit der Wanne unmittelbar oder durch wärmeleitende Zwischenelemente mittelbar verbunden ist.
Das Gehäuse kann eine frontseitige Tür aufweisen, die zweckmäßig wärmegedämmt ist. Gemäß einer bevorzugten Ausführung der Erfindung stellt sich die zirkulierende freie Konvektionsströmung zwischen einer wärmegedämmten Seitenwand des Gehäuses und einer wärmegedämmten frontseitigen Tür ein. Unter den Begriff "Seitenwand" fällt insbesondere auch eine Rückwand des Gehäuses. Die frontseitige Tür erstreckt sich zweckmäßig über die gesamte Höhe des Kühlgutaufnahmeraums.
Als Kältemittel zum Betreiben der erfindungsgemäßen Vorrichtung kann schüttfähiges Eis, welches aus Wasser besteht, verwendet werden. Als schüttfähiges Eis können beispielsweise Crushed-Eis, Eiswürfel und Scherbeneis eingesetzt werden. Zur Verbesserung des Wärmeüberganges kann der Kühlkörper zusätzliche Wärmeübertragungsflächen aufweisen, die sich in den Innenraum der Wanne erstrecken.
Verbrauchtes Kältemittel wird in Form von Schmelzwasser aus der Wanne abgelassen. Dazu ist an die Wanne eine Einrichtung zur Ableitung von Schmelzwasser angeschlossen. Im Rahmen der Erfindung liegt es auch, dass zumindest eine Seitenwand des Gehäuses und/oder eine vertikale Trennwand innerhalb des Aufnahmeraums einen Kanal zur Ableitung von Schmelzwasser aufweist.In such a transportable cooling space, the invention provides that the refrigerant reservoir has a tub for filling with pourable ice and that the cooling body is arranged on the underside of the tub and connected to the tub directly or indirectly through heat-conducting intermediate elements.
The housing can have a front door that is expediently thermally insulated. According to a preferred embodiment of the invention, the circulating free convection flow is established between a thermally insulated side wall of the housing and a thermally insulated front door. The term “side wall” also includes, in particular, a rear wall of the housing. The front door expediently extends over the entire height of the refrigerated goods receiving space.
Pourable ice, which consists of water, can be used as the refrigerant for operating the device according to the invention. For example, crushed ice, ice cubes and flake ice can be used as pourable ice. To improve the heat transfer, the heat sink can have additional heat transfer surfaces which extend into the interior of the tub.
Used refrigerant is drained from the pan in the form of melt water. For this purpose, a device for draining off melt water is connected to the tank. It is also within the scope of the invention that at least one side wall of the housing and / or a vertical partition wall within the receiving space has a channel for discharging melt water.

Die Wanne zur Aufnahme des schüttfähigen Eises kann mit einem Deckel z. B. einem abnehmbaren Deckel oder Klappdeckel verschlossen sein.
Die erfindungsgemäße Vorrichtung ist nicht auf den Betrieb mit einem schüttfähigen, aus Wasser bestehenden Eis, beschränkt. Als Kühlquelle können beispielsweise auch eutektische Platten, vorgekühlte Kühlakkus oder Trockeneis verwendet werden. Der Kältemittelspeicher weist bei derartigen Ausgestaltungen mindestens ein Fach für vorgekühlte eutektische Platten oder vorgekühlte Kühlakkus oder eine mit einem Deckel verschließbare Wanne für Trockeneis.The tub for receiving the pourable ice can with a lid z. B. be closed with a removable lid or hinged lid.
The device according to the invention is not limited to operation with pourable ice consisting of water. Eutectic plates, pre-cooled ice packs or dry ice can also be used as a cooling source. In such configurations, the refrigerant reservoir has at least one compartment for pre-cooled eutectic plates or pre-cooled cooling packs or a tub for dry ice that can be closed with a cover.

Eine besonders bevorzugte Ausgestaltung der Erfindung betrifft einen Transportwagen, der eine sich über die gesamte Höhe erstreckende frontseitige Tür aufweist und diverses Ladegut und/oder in mehreren Ebenen übereinander angeordnete Tabletts aufnimmt. Zum Einschieben von Tabletts kann der Kühlgutaufnahmeraum mit seitlichen Auflageflächen z. B. in Form von Leisten ausgestattet sein. Zwischen der frontseitigen Tür und den Tabletts sowie zwischen den Tabletts und einer wärmegedämmten Rückwand des Gehäuses verbleibt ein ausreichender Abstand, so dass sich eine zirkulierende freie Konvektionsströmung zwischen der wärmegedämmten Rückwand des Gehäuses und der frontseitigen Tür einstellen kann. Die erfindungsgemäße Lehre ermöglicht in einem solchen Transportwagen eine überraschend gleichmäßige Temperierung des Innenraums infolge einer sich innerhalb des geschlossenen Transportwagens einstellenden zirkulierenden freien Konvektionsströmung. Durch das Öffnen der Tür wird die natürliche Zirkulationsströmung gestört. Mit dem Erliegen der Zirkulationsströmung wird die Kälteabgabe an dem Kühlkörper geringer und sinkt der Kältemittelverbrauch. Folglich kann das Kältemittel im Kältemittelspeicher verbleiben, wenn der Kühlraum bei geöffneter Tür nicht genutzt wird oder die freie Konvektionsströmung durch andere Eingriffe gestört wird. Damit arbeitet die erfindungsgemäße Vorrichtung sehr energieeffizient. Nach dem Schließen der Tür stellt sich die natürliche Zirkulationsströmung schnell wieder ein.
Der erfindungsgemäße transportable Kühlraum kann eingesetzt werden, um das Kühlgut dauerhaft kalt zu halten. Durch eine dauerhafte Kühlung ist das Verkeimungsrisiko gering, so dass auch verschmutztes Geschirr transportiert werden kann. Nach einer Reinigung und einer Wiederinbetriebnahme des transportablen Kühlraums stellt sich innerhalb des Kühlgutaufnahmeraumes die gewünschte Kühltemperatur wieder schnell ein. Der transportable Kühlraum entsprechend der Erfindung eignet sich daher für einen netzunabhängigen Kalttransport von zu kühlenden Speisen und Speisenverteilkomponenten, Blutkonserven und Medikamenten.
Im Folgenden wird die Erfindung anhand einer lediglich ein Ausführungsbeispiel darstellenden Zeichnung erläutert. Es zeigen schematisch:

Fig. 1
einen Längsschnitt durch einen transportablen Kühlraum und zwar am Beispiel eines Tablett-Transportwagens,
Fig. 2
ausschnittsweise den Schnitt I-I aus Fig. 1,
Fig. 3
die Ansicht eines Speisentablett-Transportwagens aus der Blickrichtung A in Fig. 1,
Fig. 4
eine weitere Ausgestaltung des Tablett-Transportwagens ebenfalls aus der Blickrichtung A.
A particularly preferred embodiment of the invention relates to a transport trolley which has a front door extending over the entire height and accommodates various items of cargo and / or trays arranged one above the other in several levels. To insert trays, the refrigerated goods receiving space with lateral support surfaces, for. B. be equipped in the form of strips. A sufficient distance remains between the front door and the trays and between the trays and a thermally insulated rear wall of the housing so that a circulating free convection flow can set up between the thermally insulated rear wall of the housing and the front door. The teaching according to the invention enables a surprisingly uniform temperature control of the interior space in such a transport trolley as a result of a circulating free convection flow occurring within the closed transport trolley. Opening the door causes the natural circulation flow disturbed. When the circulation flow stops, the amount of cold released at the heat sink and the refrigerant consumption decreases. As a result, the refrigerant can remain in the refrigerant reservoir if the cold room is not used with the door open or the free convection flow is disturbed by other interventions. The device according to the invention thus works very efficiently. After closing the door, the natural circulation flow is quickly restored.
The transportable cold room according to the invention can be used to keep the goods to be cooled permanently cold. Continuous cooling means that the risk of contamination is low, so that dirty dishes can also be transported. After the transportable cold room has been cleaned and put back into operation, the desired cooling temperature is quickly restored within the refrigerated goods receiving room. The transportable cold room according to the invention is therefore suitable for a network-independent cold transport of food to be cooled and food distribution components, blood and medicines.
The invention is explained below with the aid of a drawing showing only one exemplary embodiment. They show schematically:
Fig. 1
a longitudinal section through a transportable cold room using the example of a tray transport trolley,
Fig. 2
excerpts from section II Fig. 1 ,
Fig. 3
the view of a food tray transport trolley from the viewing direction A in Fig. 1 ,
Fig. 4
Another embodiment of the tray transport trolley also from the direction of view A.

Die Figuren zeigen einen transportablen Kühlraum am Beispiel eines Tablett-Transportwagens. Der Tablett-Transportwagen weist ein Gehäuse 1 mit wärmegedämmten Seitenwänden 2 sowie einer ebenfalls wärmegedämmten frontseitigen Tür 3 auf. Der Tablett-Transportwagen ist ferner mit einem Kältemittelspeicher 4 zur Kühlung eines Kühlgutaufnahmeraums 5 innerhalb des Gehäuses 1 ausgestattet. Das Gehäuse 1 ist auf Rollen 6 verfahrbar. An der Innenseite des Kühlgutaufnahmeraums 5 sind seitliche Auflageflächen in Form von Leisten 7 zum Einschieben von Tabletts 8 vorgesehen. In Einschubrichtung vor und hinter den Speisentabletts halten die Tabletts 8 einen Abstand zur Seitenwand 2 des Gehäuses und der Innenseite der Tür 3 ein. Der freie Raum steht für eine in Fig. 1 angedeutete zirkulierende Luftströmung zur Verfügung.
Aus einer vergleichenden Betrachtung der Fig. 1 und 2 geht hervor, dass der Kältemittelspeicher 4 oberhalb des Kühlgutaufnahmeraums 5 angeordnet ist und einen in den Kühlgutaufnahmeraum vorstehenden Kühlkörper 9 zur Verbesserung des Wärmeaustausches aufweist. Unterhalb des Kühlkörpers 9 ist ferner eine Leitfläche 10 zur Initiierung und Führung einer im Kühlgutaufnahmeraum 5 zirkulierenden freien Konvektionsströmung angeordnet. Die Leitfläche 10 besteht aus einem Leitblech und bildet eine schräg geneigte ebene Fläche. Der Neigungswinkel beträgt etwa 1 bis 5 Grad zur Horizontalen. Das Leitblech 10 hält zur Seitenwand 2 bzw. Rückwand des Gehäuses und zur Innenseite der Tür 3 vorzugsweise jeweils einen Abstand von mindestens 30 mm ein, um die Zirkulation der freien Konvektionsströmung nicht zu behindern.The figures show a transportable cold room using the example of a tray transport trolley. The tray transport trolley has a housing 1 with thermally insulated side walls 2 and a front door 3 that is likewise thermally insulated. The tray transport trolley is also equipped with a refrigerant reservoir 4 for cooling a refrigerated goods receiving space 5 within the housing 1. The housing 1 can be moved on rollers 6. On the inside of the refrigerated goods receiving space 5, lateral support surfaces in the form of strips 7 for inserting trays 8 are provided. In the direction of insertion in front of and behind the food trays, the trays 8 maintain a distance from the side wall 2 of the housing and the inside of the door 3. The free space stands for an in Fig. 1 indicated circulating air flow available.
From a comparative consideration of the Fig. 1 and 2 it can be seen that the refrigerant reservoir 4 is arranged above the refrigerated goods receiving space 5 and has a cooling body 9 protruding into the refrigerated goods receiving space to improve the heat exchange. A guide surface 10 for initiating and guiding a free convection flow circulating in the refrigerated goods receiving space 5 is also arranged below the cooling body 9. The guide surface 10 consists of a guide plate and forms an obliquely inclined flat surface. The angle of inclination is about 1 to 5 degrees to the horizontal. The guide plate 10 preferably maintains a distance of at least 30 mm to the side wall 2 or rear wall of the housing and to the inside of the door 3 in order not to hinder the circulation of the free convection flow.

Der Kühlkörper 9 ist als Rippenkühlkörper ausgebildet. Er weist eine Anordnung aus mehreren in den Kühlgutaufnahmeraum vorstehenden parallelen Kühlrippen 11 auf und ist an der Unterseite einer Wanne 12 angeordnet, die beispielsweise mit schüttfähigem Eis befüllt ist. Die mit schüttfähigem Eis befüllte Wanne 12 bildet den Kältemittelspeicher 4. Der Kühlkörper 9 ist unmittelbar oder durch wärmeleitende Zwischenelemente mittelbar mit der Wanne 12 verbunden. Diese besteht ebenso wie der Kühlkörper 9 aus einem Material mit guten Wärmeleiteigenschaften. Die Wanne 12 ist im Ausführungsbeispiel aus Metallblech gefertigt. Gemäß der Darstellung in Fig. 2 weist der Kühlkörper 9 zur Verbesserung des Wärmeübergangs zusätzliche Wärmeübertragungsflächen 13 auf, die sich in den Innenraum der Wanne 12 erstrecken. Die Wärmeübertragungsflächen 13 sind als Rippen ausgebildet, wobei der Abstand zwischen den Rippen ausreichend groß gewählt ist, damit das schüttfähige Eis 14 die Zwischenräume zwischen den Rippen ausfüllen kann.
Die Wanne 12 ist zweckmäßig mit einem Deckel 15 verschlossen und eignet sich auch zur Aufnahme von Trockeneis als Kältemittel. Sofern die Wanne mit einer ebenen Bodenfläche ausgebildet ist, kann die Wanne auch mit vorgekühlten Kühlakkus oder vorgekühlten eutektischen Platten beschickt werden.
An die Wanne 12 kann eine in den Fig. 1 und 2 nicht dargestellte Einrichtung zur Ableitung von Schmelzwasser angeschlossen sein. Im Ausführungsbeispiel der Fig. 3 weist eine vertikale Trennwand 16 innerhalb der Kühlgutaufnahmeraums 5 einen Kanal 17 zur Ableitung von Schmelzwasser auf. Im Ausführungsbeispiel der Fig. 4 ist der Kanal zur Ableitung von Schmelzwasser an oder in einer Seitenwand 2 des Gehäuses 1 angeordnet.The heat sink 9 is designed as a ribbed heat sink. It has an arrangement of several parallel cooling ribs 11 protruding into the refrigerated goods receiving space and is arranged on the underside of a trough 12, which is filled, for example, with pourable ice. The tub 12 filled with pourable ice forms the refrigerant reservoir 4. The cooling body 9 is connected to the tub 12 directly or indirectly through heat-conducting intermediate elements. Like the heat sink 9, this consists of a material with good thermal conductivity properties. The tub 12 is made of sheet metal in the exemplary embodiment. As shown in Fig. 2 if the heat sink 9 has additional heat transfer surfaces 13, which extend into the interior of the trough 12, to improve the heat transfer. The heat transfer surfaces 13 are designed as ribs, the distance between the ribs being selected to be sufficiently large so that the pourable ice 14 can fill the spaces between the ribs.
The tub 12 is expediently closed with a cover 15 and is also suitable for receiving dry ice as a refrigerant. If the tub is designed with a flat bottom surface, the tub can also be charged with pre-cooled ice packs or pre-cooled eutectic plates.
To the tub 12 can be in the Fig. 1 and 2 Not shown device for draining melt water be connected. In the embodiment of Fig. 3 has a vertical partition 16 within the refrigerated goods receiving space 5 on a channel 17 for draining melt water. In the embodiment of Fig. 4 the channel for discharging melt water is arranged on or in a side wall 2 of the housing 1.

Claims (11)

  1. A transportable cooling chamber having a housing (1), a chilled goods holding space (5) within this housing (1) and a coolant store (4) for cooling this chilled goods holding space (5) within the housing (1), wherein the coolant store (4) is arranged above the chilled goods holding space (5) and comprises a cooling body (9) for improving heat exchange and wherein a lead surface (10) is provided for initiating and guiding a free convection flow circulating in the chilled goods holding space (5), wherein the cooling body (9) is arranged above the lead surface (10) and comprises an arrangement of a number of parallel cooling ribs (11) protruding into the chilled goods holding space and wherein the circulating free convection flow is directed downwards along a thermally insulated wall surface of the housing (1) and rises again at an opposite wall surface, wherein the coolant store (4) comprises a trough (12) for filling with pourable ice (14),
    characterised in that the cooling body (9) is arranged on the underside of the trough (12) and is connected to the trough (12) directly or indirectly via heat-conducting intermediate elements.
  2. The cooling chamber according to claim 1, characterised in that the circulating free convection flow occurs between a thermally insulated sidewall of the housing and a thermally insulated front-side door.
  3. The cooling chamber according to claim 2, characterised in that the chilled goods holding space (5) is furnished with lateral support surfaces (7) for inserting trays (8).
  4. The cooling chamber according to one of claims 1 to 3, characterised in that the lead surface (10) is an obliquely sloping planar surface.
  5. The cooling chamber according to claim 4, characterised in that the lead surface (10) is inclined at an angle of 1 to 5 degrees to the horizontal.
  6. The cooling chamber according to one of claims 1 to 5, characterised in that the cooling body (9) comprises additional heat transfer surfaces (13) for improving heat transfer, the heat transfer surfaces extending into the interior of the trough (12).
  7. The cooling chamber according to one of claims 1 to 6, characterised in that a means for draining melt water is connected to the trough (12).
  8. The cooling chamber according to one of claims 1 to 7, characterised in that at least one sidewall (2) of the housing and/or a vertical partition (16) within the chilled goods holding space (5) comprises a channel (17) for draining the melt water.
  9. The cooling chamber according to one of claims 1 to 8, characterised in that the trough (12) is closed by a lid (15).
  10. The cooling chamber according to one of claims 1 to 9, characterised in that the coolant store (4) comprises at least one compartment for pre-cooled eutectic plates or pre-cooled freezer packs.
  11. The cooling chamber according to one of claims 1 to 10, characterised in that the housing (1) is movable on rollers (6).
EP14176020.7A 2013-07-05 2014-07-07 Transportable cooling chamber Active EP2821739B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013107125 2013-07-05
DE102013111813.5A DE102013111813B4 (en) 2013-07-05 2013-10-25 Transportable refrigerator

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EP2821739A2 EP2821739A2 (en) 2015-01-07
EP2821739A3 EP2821739A3 (en) 2015-03-25
EP2821739B1 true EP2821739B1 (en) 2020-09-09

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017101011A1 (en) * 2017-01-19 2018-07-19 Hupfer Metallwerke Gmbh & Co. Kg Food dispenser and method for operating a food dispenser

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2263522A (en) * 1936-12-24 1941-11-18 James G Scott Apparatus for control and utilization of dry ice

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1921147A (en) * 1929-07-13 1933-08-08 William F Baird Method of and means for controlling low temperature refrigerants
FR700071A (en) * 1930-08-04 1931-02-24 Improvements to refrigeration devices, in particular ice boxes
US2026353A (en) * 1932-06-09 1935-12-31 William G Mayer Method and apparatus for refrigerating with solid refrigerants
US2073700A (en) * 1934-03-22 1937-03-16 Lester S Keilholtz Device for using solid refrigerant to effect rapid cooling of small enclosed spaces
US2123678A (en) * 1937-05-01 1938-07-12 Refrigerator container
DE29813189U1 (en) * 1998-07-24 1999-02-04 Hupfer Metallwerke GmbH & Co., 48653 Coesfeld Food transport trolley with cooling walls
DE102010027541A1 (en) * 2010-07-16 2012-01-19 Hupfer Metallwerke Gmbh & Co. Kg Method for cooling a food transport trolley and food transport trolley for carrying out the method
BE1020015A5 (en) * 2011-02-09 2013-03-05 Acp Belgium N V SYSTEM FOR INSERTING COOLANT TO A CONTAINER.

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2263522A (en) * 1936-12-24 1941-11-18 James G Scott Apparatus for control and utilization of dry ice

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EP2821739A2 (en) 2015-01-07
DE102013111813B4 (en) 2016-07-28
DE102013111813A1 (en) 2015-01-08

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