WO2009080535A2 - Refrigerator and method for producing a refrigerator - Google Patents

Refrigerator and method for producing a refrigerator Download PDF

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Publication number
WO2009080535A2
WO2009080535A2 PCT/EP2008/067279 EP2008067279W WO2009080535A2 WO 2009080535 A2 WO2009080535 A2 WO 2009080535A2 EP 2008067279 W EP2008067279 W EP 2008067279W WO 2009080535 A2 WO2009080535 A2 WO 2009080535A2
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WO
WIPO (PCT)
Prior art keywords
micro
beads
polyurethane foam
components
insulation
Prior art date
Application number
PCT/EP2008/067279
Other languages
German (de)
French (fr)
Other versions
WO2009080535A3 (en
Inventor
Dasaradh Kumar Patchala
Original Assignee
BSH Bosch und Siemens Hausgeräte GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BSH Bosch und Siemens Hausgeräte GmbH filed Critical BSH Bosch und Siemens Hausgeräte GmbH
Priority to EP08865877A priority Critical patent/EP2225511A2/en
Priority to CN2008801222613A priority patent/CN101903723A/en
Publication of WO2009080535A2 publication Critical patent/WO2009080535A2/en
Publication of WO2009080535A3 publication Critical patent/WO2009080535A3/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
    • F25D23/00—General constructional features
    • F25D23/06—Walls
    • F25D23/065—Details
    • 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
    • F25D23/062—Walls defining a cabinet
    • 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
    • F25D2201/00—Insulation
    • F25D2201/10—Insulation with respect to heat
    • F25D2201/12—Insulation with respect to heat using an insulating packing 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
    • F25D2201/00—Insulation
    • F25D2201/10—Insulation with respect to heat
    • F25D2201/12—Insulation with respect to heat using an insulating packing material
    • F25D2201/126—Insulation with respect to heat using an insulating packing material of cellular type

Definitions

  • the invention relates to a refrigeration device and a method for producing a refrigeration device according to the preamble of claim 1 or claim 7.
  • the insulated interior of a refrigerator is usually limited by an inner shell, which consists of plastic and has only one open side.
  • This inner shell is mounted on a pedestal. Now the refrigerant circuit with all its components is installed and the electrical components are mounted and connected together. The conclusion to the outside forms an outer housing.
  • the space between the inner shell and the outer casing is filled with an insulating material. Often this polyurethane foam is used.
  • an injection opening is provided in the outer housing. This injection opening is located in the so-called engine room, in which the compressor of the refrigerant circuit is housed.
  • the components for the production of the polyurethane foam are combined in a mixing head and injected under high pressure through the injection opening into the gap. Due to the expansion of the polyurethane foam during curing and the high injection pressure, the entire gap is filled completely with the foam. This results in a closed insulation layer that shields the interior from five sides against the ambient temperature. The open sixth side is closed by an also insulated door.
  • the insulation capacity of the insulating material must be improved.
  • today known films can not hold a corresponding vacuum over the life of a refrigerator. This means that the insulating capability of the refrigeration device in the period between manufacture and disposal would constantly deteriorate.
  • the invention is based on the object, a refrigerator according to the preamble of
  • Claim 1 to be improved so that the cooled interior is better isolated from the environment, without causing the insulation layer must be strengthened. Furthermore, a method for producing such improved refrigerators is to be found.
  • micro-beads to the polyurethane foam having a cavity of is enclosed in a thin shell, created in the polyurethane foam micro-pores, which improve the insulation effect.
  • micro-spheres have become known, for example, by the company Expancel and are used to lower the density and thus the weight of plastic articles.
  • the micro-beads are added to the plastic and heated.
  • the shell of the micro-spheres softens and at the same time evaporate the hydrocarbons inside the micro-spheres.
  • the micro-beads grow to about four times their original size. The result is a plastic with closed pores, in which hydrocarbons in liquid or gaseous form are present.
  • micro-beads according to the invention When using the micro-beads according to the invention as small as possible Pores are generated in the polyurethane foam.
  • the micro-beads should therefore retain their original size.
  • the enclosed by the shell cavity is advantageously filled with hydrocarbons.
  • Hydrocarbons containing four to eight carbon atoms are preferably used here. These hydrocarbons have a low thermal conductivity and thus improve the insulating ability of the polyurethane foam.
  • the polyurethane foam micro-particles are mixed, which have a diameter between 5 and 30 microns. This makes it possible to produce a very fine foam structure, which already comes close to the so-called nano-foams in their insulating effect. By using the microspheres, however, the production of the foam thus produced is associated with a much lower cost than the production of nano-foams. Consequently, lower production costs are incurred.
  • the polyurethane foam advantageously contains microspheres in a proportion of 1 to 5 vol.%. It has been found that even with an addition of 1%, an improvement in the insulating capacity of the polyurethane foam takes place. This is noticeable by a measurable decrease of the thermal conductivity of approx. 2 to 3%. With the addition of 5%, the decrease of the thermal conductivity is about 7 to 9%.
  • the new insulation can be used with conventional refrigerators, where the polyurethane foam is injected into the space between the inner shell and an outer shell.
  • conventional refrigerators where the polyurethane foam is injected into the space between the inner shell and an outer shell.
  • an application is also possible in refrigerators, in which the insulation is prefabricated in the form of composite panels.
  • mobile refrigerators such as coolers in motor vehicles or camping refrigerators should be mentioned. Such coolers are often cooled by a Peltier element in the lid of the box.
  • Polyurethane foam injected into the space between the inner shell and the outer housing under high pressure through an injection port in the outer housing.
  • the components that are needed for the production of the insulating material are combined in a mixing head, which is arranged in front of the injection opening.
  • the mixed components are then injected through the injection port at high pressure into the space between the inner shell and the outer shell.
  • the micro-beads are mixed in front of the mixing head of one of the components.
  • the same mixing head could be used, which is currently used for the foaming of conventional refrigerators.
  • the microspheres are mixed together in the mixing head simultaneously with the components for the polyurethane foam.
  • a mixing head is used, which still has a third feed for the micro-beads to the usually two feeds for the components of the polyurethane foam.
  • Fig. 2 shows a mixing arrangement for the components to be injected
  • Fig. 3 shows a micro-sphere in a schematic representation.
  • the refrigeration device 1 shown in Fig. 1 has an inner shell 19, which is the cooled Interior 2 delimits.
  • the refrigeration device 1 further has an outer housing 20 and a door 3, which closes the cooled interior 2 at its open front side.
  • the compressor 5 is mounted in the engine room 4 of the refrigerator 1.
  • the inner shell 19 and the outer housing 20 define a gap in which the insulation 6 is mounted.
  • the injection opening 7 is provided, which is located in the machine room 4.
  • Fig. 2 shows a mixing arrangement for mixing the individual components of the insulation and for injecting the mixture through the injection opening 7 in the space between the inner shell 19 and the outer housing 20.
  • the mixing head 8 has a nozzle 15 which the finished mixture in the direction of injected at the nozzle 15 attached arrow through the injection port 7 with high pressure.
  • the mixing head 8 has feeds 9, 10, 11 for three components.
  • the polyol component for the polyurethane foam receives the mixing head 8 from the metering 10 via the feed 9.
  • the isocyanate component for the polyurethane foam is introduced from the metering 14 via the feed 11 into the mixing head 8.
  • the micro-pellets 16 see Fig. 3 from the dosage 13 enter the mixing head 8.
  • Fig. 3 the structure of the micro-beads 16 is shown.
  • the cavity 17 is enclosed by a thin shell 18.
  • the shell consists of a copolymer.
  • a hydrocarbon such as i-butane, i-pentane or i-octane is included.
  • micro-beads 16 which preferably have a diameter of about 5 microns, are in the mixing head 8 together with the polyol component and the
  • Isocyanate component intimately mixed. This mixture is injected through the nozzle 15 at high pressure through the injection port 7 into the space between the inner shell 19 and the outer housing 20. During curing, the foam spreads over the entire space and forms a closed insulation 6, the cooled interior 2 shields from the environment.
  • the thermal conductivity of the insulation 6 is reduced by about 7 to 9%. Due to this improved insulation, the refrigerant circuit must be put into operation less frequently. In this way energy can be saved at the same rate.

Abstract

The invention is directed to a refrigerator having an insulated inner compartment (2) and a cold generator (5) for cooling the insulated inner chamber (2). According to the invention, the installation (6) of the inner chamber (2) contains a polyurethane foam, to which microbeads (16) are admixed, which have a cavity (17), and which is enclosed by a thin envelope (18).

Description

Kältegerät und Verfahren zur Herstellung eines Kältegeräts Refrigeration device and method for producing a refrigeration device
Die Erfindung betrifft ein Kältegerät und ein Verfahren zur Herstellung eines Kältegeräts nach dem Oberbegriff von Anspruch 1 bzw. Anspruch 7.The invention relates to a refrigeration device and a method for producing a refrigeration device according to the preamble of claim 1 or claim 7.
Der isolierte Innenraum eines Kältegeräts wird üblicherweise durch eine Innenschale begrenzt, die aus Kunststoff besteht und nur eine offene Seite aufweist. Diese Innenschale wird auf einem Sockel montiert. Nun wird der Kältemittelkreislauf mit all seinen Komponenten installiert und die elektrischen Bauteile werden angebracht und miteinander verbunden. Den Abschluss nach außen bildet ein Außengehäuse.The insulated interior of a refrigerator is usually limited by an inner shell, which consists of plastic and has only one open side. This inner shell is mounted on a pedestal. Now the refrigerant circuit with all its components is installed and the electrical components are mounted and connected together. The conclusion to the outside forms an outer housing.
Wenn dieses Außengehäuse montiert ist, wird der Raum zwischen der Innenschale und dem Außengehäuse mit einem Isoliermaterial gefüllt. Oft wird hierfür Polyurethan-Schaum verwendet. Um den Polyuhrethan-Schaum in den Raum zwischen Innenschale und Außengehäuse einbringen zu können ist eine Einspritzöffnung in dem Außengehäuse vorgesehen. Diese Einspritzöffnung befindet sich im so genannten Maschinenraum, in dem der Verdichter des Kältemittelkreislaufs untergebracht ist.When this outer casing is mounted, the space between the inner shell and the outer casing is filled with an insulating material. Often this polyurethane foam is used. In order to be able to introduce the polyurethane foam into the space between the inner shell and the outer housing, an injection opening is provided in the outer housing. This injection opening is located in the so-called engine room, in which the compressor of the refrigerant circuit is housed.
Die Komponenten für die Erzeugung des Polyurethan-Schaums werden in einem Mischkopf zusammengeführt und unter Hochdruck durch die Einspritzöffnung in den Zwischenraum gespritzt. Durch die Ausdehnung des Polyurethan-Schaums bei der Härtung und durch den hohen Einspritzdruck wird der komplette Zwischenraum lückenlos mit dem Schaum gefüllt. Es entsteht auf diese Weise eine geschlossene Isolationsschicht, die den Innenraum von fünf Seiten gegen die Umgebungstemperatur abschirmt. Die offene sechste Seite wird durch eine ebenfalls isolierte Tür geschlossen.The components for the production of the polyurethane foam are combined in a mixing head and injected under high pressure through the injection opening into the gap. Due to the expansion of the polyurethane foam during curing and the high injection pressure, the entire gap is filled completely with the foam. This results in a closed insulation layer that shields the interior from five sides against the ambient temperature. The open sixth side is closed by an also insulated door.
Das allgemeine Bestreben bei der Herstellung von Kältegeräten geht in Richtung der Reduzierung des Energieverbrauchs. Hierzu gehört die Weiterentwicklung der Kälteerzeuger, aber auch die Verbesserung der Isolierung ist ein Ziel. Eine einfache Verstärkung der Isolationsschicht ist jedoch nicht praktikabel, da sie auf Kosten des für die Lagerung von Kühlgut zur Verfügung stehenden Raums gehen würde.The general trend in the manufacture of refrigerators is towards reducing energy consumption. This includes the further development of the refrigerators, but also the improvement of the insulation is a goal. A simple one Reinforcing the insulation layer is not practical, however, as it would be at the expense of the space available for storage of refrigerated goods.
Es muss folglich das Isolationsvermögen des Isoliermaterials verbessert werden. Beispielsweise wurde hierzu bereits vorgeschlagen, das Isolationsmaterial zu evakuieren. Es hat sich jedoch herausgestellt, dass heute bekannte Folien ein entsprechendes Vakuum nicht über die Lebensdauer eines Kältegeräts halten können. Dies bedeutet, dass sich die Isolierfähigkeit des Kältegeräts in dem Zeitraum zwischen Herstellung und Entsorgung ständig verschlechtern würde.Consequently, the insulation capacity of the insulating material must be improved. For example, it has already been proposed for this purpose to evacuate the insulation material. However, it has been found that today known films can not hold a corresponding vacuum over the life of a refrigerator. This means that the insulating capability of the refrigeration device in the period between manufacture and disposal would constantly deteriorate.
Der Erfindung liegt die Aufgabe zugrunde, ein Kältegerät nach dem Oberbegriff vonThe invention is based on the object, a refrigerator according to the preamble of
Anspruch 1 so zu verbessern, dass der gekühlte Innenraum besser gegen die Umgebung isoliert ist, ohne dass dabei die Isolationsschicht verstärkt werden muss. Weiterhin soll ein Verfahren zur Herstellung solcher verbesserter Kältegeräte gefunden werden.Claim 1 to be improved so that the cooled interior is better isolated from the environment, without causing the insulation layer must be strengthened. Furthermore, a method for producing such improved refrigerators is to be found.
Gelöst wird die Aufgabe gemäß der Erfindung durch ein Kältegerät mit den Merkmalen von Anspruch 1 und durch ein Verfahren zur Herstellung eines Kältegeräts mit den Merkmalen von Anspruch 7. Durch das Beisetzen von Micro-Kügelchen zu dem Polyurethan-Schaum, die einen Hohlraum aufweisen der von einer dünnen Hülle umschlossen ist, entstehen in dem Polyurethan-Schaum Micro-Poren, die die Isolationswirkung verbessern. Solche Micro-Kügelchen sind beispielsweise durch die Firma Expancel bekannt geworden und werden benutzt, um die Dichte und damit das Gewicht von Kunststoffartikeln abzusenken. Hierzu werden die Micro-Kügelchen dem Kunststoff beigemischt und erhitzt. Hierdurch wird die Hülle der Micro-Kügelchen weich und gleichzeitig verdampfen die Kohlenwasserstoffe im Inneren der Micro-Kügelchen. Die Micro-Kügelchen wachsen dabei auf etwa das Vierfache ihrer ursprünglichen Größe an. Es entsteht so ein Kunststoff mit geschlossenen Poren, in denen Kohlenwasserstoffe in flüssiger - oder gasförmiger Form vorhanden sind.The object is achieved according to the invention by a refrigerator with the features of claim 1 and by a method for producing a refrigerator with the features of claim 7. By the addition of micro-beads to the polyurethane foam having a cavity of is enclosed in a thin shell, created in the polyurethane foam micro-pores, which improve the insulation effect. Such micro-spheres have become known, for example, by the company Expancel and are used to lower the density and thus the weight of plastic articles. For this purpose, the micro-beads are added to the plastic and heated. As a result, the shell of the micro-spheres softens and at the same time evaporate the hydrocarbons inside the micro-spheres. The micro-beads grow to about four times their original size. The result is a plastic with closed pores, in which hydrocarbons in liquid or gaseous form are present.
Bei der erfindungsgemäßen Anwendung der Micro-Kügelchen sollen möglichst kleine Poren in dem Polyurethan-Schaum erzeugt werden. Die Micro-Kügelchen sollen daher ihre ursprüngliche Größe behalten.When using the micro-beads according to the invention as small as possible Pores are generated in the polyurethane foam. The micro-beads should therefore retain their original size.
Der von der Hülle umschlossene Hohlraum ist vorteilhaft mit Kohlenwasserstoffen gefüllt. Es werden hier vorzugsweise Kohlenwasserstoffe mit vier bis acht Kohlenstoffatomen verwendet. Diese Kohlenwasserstoffe besitzen eine geringe Wärmeleitfähigkeit und verbessern so die Isolationsfähigkeit des Polyurethan-Schaums.The enclosed by the shell cavity is advantageously filled with hydrocarbons. Hydrocarbons containing four to eight carbon atoms are preferably used here. These hydrocarbons have a low thermal conductivity and thus improve the insulating ability of the polyurethane foam.
In bevorzugter Weise werden dem Polyurethan-Schaum Micro-Küglelchen beigemischt, die einen Durchmesser zwischen 5 und 30 μm aufweisen. Hiermit lässt sich eine sehr feine Schaumstruktur erzeugen, die in ihrer Isolationswirkung bereits nahe an die sogenannten Nano-Schäume heranreicht. Durch die Verwendung der Micro-Kügelchen ist die Herstellung des so erzeugten Schaums jedoch mit einem wesentlich geringerem Aufwand als die Erzeugung von Nano-Schäumen verbunden. Folglich fallen auch geringere Herstellkosten an.Preferably, the polyurethane foam micro-particles are mixed, which have a diameter between 5 and 30 microns. This makes it possible to produce a very fine foam structure, which already comes close to the so-called nano-foams in their insulating effect. By using the microspheres, however, the production of the foam thus produced is associated with a much lower cost than the production of nano-foams. Consequently, lower production costs are incurred.
Der Polyurethan-Schaum enthält vorteilhaft Micro-Kügelchen in einem Anteil von 1 bis 5 Vol.%. Es hat sich herausgestellt, dass bereits bei einer Zugabe von 1 % eine Verbesserung des Isolationsvermögens des Polyurethan-Schaums stattfindet. Dies macht sich durch eine messbare Abnahme der Wärmeleitfähigkeit von ca. 2 bis 3 % bemerkbar. Bei der Zugabe von 5 % liegt die Abnahme der Wärmeleitfähigkeit bei ca. 7 bis 9 %.The polyurethane foam advantageously contains microspheres in a proportion of 1 to 5 vol.%. It has been found that even with an addition of 1%, an improvement in the insulating capacity of the polyurethane foam takes place. This is noticeable by a measurable decrease of the thermal conductivity of approx. 2 to 3%. With the addition of 5%, the decrease of the thermal conductivity is about 7 to 9%.
Die neue Isolierung kann bei herkömmlichen Kältegeräten eingesetzt werden, bei denen der Polyurethan-Schaum in den Raum zwischen der Innenschale und einem Außengehäuse eingespritzt wird. Eine Anwendung ist jedoch auch bei Kältegeräten möglich, bei denen die Isolierung in Form von Verbundplatten vorgefertigt ist. Als Beispiel sind hier mobile Kältegeräte wie Kühlboxen in Kraftfahrzeugen oder auch Camping-Kühlschränke zu nennen. Solche Kühlboxen werden oft über ein Peltier-Element im Deckel der Box gekühlt. - A -The new insulation can be used with conventional refrigerators, where the polyurethane foam is injected into the space between the inner shell and an outer shell. However, an application is also possible in refrigerators, in which the insulation is prefabricated in the form of composite panels. As an example, here mobile refrigerators such as coolers in motor vehicles or camping refrigerators should be mentioned. Such coolers are often cooled by a Peltier element in the lid of the box. - A -
Bei herkömmlichen Kältegeräten werden die Komponenten zur Erzeugung desIn conventional refrigerators, the components for generating the
Polyurethan-Schaums in den Raum zwischen der Innenschale und dem Außengehäuse unter Hochdruck durch eine Einspritzöffnung in dem Außengehäuse eingespritzt. Die Komponenten, die für die Erzeugung des Isoliermaterials benötigt werden, werden in einem Mischkopf zusammengeführt, der vor der Einspritzöffnung angeordnet ist. Die gemischten Komponenten werden dann über die Einspritzöffnung mit Hochdruck in den Raum zwischen der Innenschale und dem Außengehäuse eingespritzt.Polyurethane foam injected into the space between the inner shell and the outer housing under high pressure through an injection port in the outer housing. The components that are needed for the production of the insulating material are combined in a mixing head, which is arranged in front of the injection opening. The mixed components are then injected through the injection port at high pressure into the space between the inner shell and the outer shell.
In einem Ausführungsbeispiel des erfindungsgemäßen Verfahrens werden die Micro-Kügelchen vor dem Mischkopf einer der Komponenten zugemischt. Bei diesem Ausführungsbeispiel könnte der gleiche Mischkopf verwendet werden, der bisher für das Ausschäumen herkömmlicher Kältegeräte verwendet wird.In one embodiment of the method according to the invention, the micro-beads are mixed in front of the mixing head of one of the components. In this embodiment, the same mixing head could be used, which is currently used for the foaming of conventional refrigerators.
In einem weiteren Ausführungsbeispiel werden die Micro-Kügelchen in dem Mischkopf gleichzeitig mit den Komponenten für den Polyurethan-Schaum zusammengemischt. Hierbei kommt ein Mischkopf zum Einsatz, der zu den üblicherweise zwei Zuführungen für die Komponenten des Polyurethan-Schaums noch eine dritte Zuführung für die Micro-Kügelchen besitzt.In another embodiment, the microspheres are mixed together in the mixing head simultaneously with the components for the polyurethane foam. Here, a mixing head is used, which still has a third feed for the micro-beads to the usually two feeds for the components of the polyurethane foam.
Weitere Einzelheiten und Vorteile der Erfindung ergeben sich aus den Unteransprüchen im Zusammenhang mit der Beschreibung eines Ausführungsbeispiels, das anhand der Zeichnung eingehend erläutert wird.Further details and advantages of the invention will become apparent from the subclaims in connection with the description of an embodiment which is explained in detail with reference to the drawing.
Es zeigt:It shows:
Fig. 1 einen Schnitt durch ein erfindungsgemäßes Kältegerät,1 shows a section through an inventive refrigeration device,
Fig. 2 eine Mischanordnung für die einzuspritzenden Komponenten undFig. 2 shows a mixing arrangement for the components to be injected and
Fig. 3 ein Micro-Kügelchen in schematischer Darstellung.Fig. 3 shows a micro-sphere in a schematic representation.
Das in Fig. 1 gezeigte Kältegerät 1 besitzt eine Innenschale 19, die den gekühlten Innenraum 2 abgrenzt. Das Kältegerät 1 weist weiterhin ein Außengehäuse 20 und eine Tür 3 auf, die den gekühlten Innenraum 2 an seiner offenen Frontseite verschließt. In dem Maschinenraum 4 des Kältegeräts 1 ist der Verdichter 5 montiert.The refrigeration device 1 shown in Fig. 1 has an inner shell 19, which is the cooled Interior 2 delimits. The refrigeration device 1 further has an outer housing 20 and a door 3, which closes the cooled interior 2 at its open front side. In the engine room 4 of the refrigerator 1, the compressor 5 is mounted.
Die Innenschale 19 und das Außengehäuse 20 begrenzen einen Zwischenraum, in dem die Isolierung 6 angebracht ist. Zum Einbringen des Isoliermaterials ist die Einspritzöffnung 7 vorgesehen, die sich in dem Maschinenraum 4 befindet.The inner shell 19 and the outer housing 20 define a gap in which the insulation 6 is mounted. For introducing the insulating material, the injection opening 7 is provided, which is located in the machine room 4.
Fig. 2 zeigt eine Mischanordnung zum Mischen der einzelnen Komponenten der Isolierung und zum Einspritzen der Mischung durch die Einspritzöffnung 7 in den Raum zwischen der Innenschale 19 und dem Außengehäuse 20. Der Mischkopf 8 weist eine Düse 15 auf, die die fertige Mischung in Richtung des an der Düse 15 angesetzten Pfeils durch die Einspritzöffnung 7 mit Hochdruck einspritzt. Der Mischkopf 8 weist Zuführungen 9, 10, 11 für drei Komponenten auf. Die Polyolkomponente für den Polyurethan-Schaum erhält der Mischkopf 8 von der Dosierung 10 über die Zufuhr 9. Die Isocyanatkomponente für den Polyurethan-Schaum wird von der Dosierung 14 über die Zufuhr 11 in den Mischkopf 8 eingeleitet. Durch die Zufuhr 10 kommen von der Dosierung 13 die Micro-Kügelchen 16 (s. Fig. 3) in den Mischkopf 8.Fig. 2 shows a mixing arrangement for mixing the individual components of the insulation and for injecting the mixture through the injection opening 7 in the space between the inner shell 19 and the outer housing 20. The mixing head 8 has a nozzle 15 which the finished mixture in the direction of injected at the nozzle 15 attached arrow through the injection port 7 with high pressure. The mixing head 8 has feeds 9, 10, 11 for three components. The polyol component for the polyurethane foam receives the mixing head 8 from the metering 10 via the feed 9. The isocyanate component for the polyurethane foam is introduced from the metering 14 via the feed 11 into the mixing head 8. By means of the feed 10, the micro-pellets 16 (see Fig. 3) from the dosage 13 enter the mixing head 8.
In Fig. 3 ist der Aufbau der Micro-Kügelchen 16 dargestellt. Der Hohlraum 17 ist von einer dünnen Hülle 18 umschlossen. In dem hier erläuterten Beispiel besteht die Hülle aus einem Copolymer. In dem Hohlraum 17 ist ein Kohlenwasserstoff wie beispielsweise i-Butan, i-Pentan oder i-Oktan eingeschlossen.In Fig. 3, the structure of the micro-beads 16 is shown. The cavity 17 is enclosed by a thin shell 18. In the example illustrated here, the shell consists of a copolymer. In the cavity 17, a hydrocarbon such as i-butane, i-pentane or i-octane is included.
Die Micro-Kügelchen 16, die bevorzugt einen Durchmesser von ca. 5 μm aufweisen, werden in dem Mischkopf 8 zusammen mit der Polyolkomponente und derThe micro-beads 16, which preferably have a diameter of about 5 microns, are in the mixing head 8 together with the polyol component and the
Isocyanatkomponente innig vermischt. Diese Mischung wird über die Düse 15 mit hohem Druck durch die Einspritzöffnung 7 in den Raum zwischen der Innenschale 19 und dem Außengehäuse 20 gespritzt. Bei der Aushärtung breitet sich der Schaum über den gesamten Zwischenraum aus und bildet eine geschlossene Isolierung 6, die den gekühlten Innenraum 2 von der Umgebung abschirmt.Isocyanate component intimately mixed. This mixture is injected through the nozzle 15 at high pressure through the injection port 7 into the space between the inner shell 19 and the outer housing 20. During curing, the foam spreads over the entire space and forms a closed insulation 6, the cooled interior 2 shields from the environment.
Durch die Zudosierung der Micro-Kügelchen 16 zu dem Polyurethan-Schaum mit einem Volumenanteil von ca. 5 % erniedrigt sich die Wärmeleitfähigkeit der Isolierung 6 um ca. 7 bis 9 %. Durch diese verbesserte Isolierung muss der Kältemittelkreislauf seltener in Betrieb gesetzt werden. Auf diese Weise lässt sich Energie etwa in Höhe des gleichen Prozentsatzes einsparen. By adding the micro-beads 16 to the polyurethane foam with a volume fraction of about 5%, the thermal conductivity of the insulation 6 is reduced by about 7 to 9%. Due to this improved insulation, the refrigerant circuit must be put into operation less frequently. In this way energy can be saved at the same rate.
Bezugszeichenliste:LIST OF REFERENCE NUMBERS
1 Kältegerät1 refrigeration device
2 gekühlter Innenraum2 refrigerated interior
3 Tür3 door
4 Maschinenraum4 engine room
5 Verdichter5 compressors
6 Isolierung6 insulation
7 Einspritzöffnung7 injection port
8 Mischkopf8 mixing head
9 Zufuhr für die Polyolkomponente9 Feed for the polyol component
10 Zufuhr für die Micro-Kügelchen10 feed for the micro-beads
11 Zufuhr für die Isocyanatkomponente11 Feed for the isocyanate component
12 Dosierung für die Polyolkomponente12 Dosage for the polyol component
13 Dosierung für die Micro-Kügelchen13 Dosage for the micro-beads
14 Dosierung für die Isocyanatkomponente14 Dosage for the isocyanate component
15 Düse15 nozzle
16 Micro-Kügelchen16 micro-beads
17 Hohlraum17 cavity
18 Hülle18 case
19 Innenschale19 inner shell
20 Außengehäuse 20 outer casing

Claims

Patentansprüche claims
1. Kältegerät mit einem isolierten Innenraum (2) und einem Kälteerzeuger (5) zum Kühlen des isolierten Innenraums (2), dadurch gekennzeichnet, dass die Isolierung (6) des Innenraums (2) einen Polyurethan-Schaum enthält, dem Micro- Kügelchen (16) beigesetzt sind, die einen Hohlraum (17) aufweisen, der von einer dünnen Hülle (18) umschlossen ist.1. Refrigerating appliance with an insulated interior (2) and a cold generator (5) for cooling the insulated interior (2), characterized in that the insulation (6) of the interior (2) contains a polyurethane foam, the micro-beads ( 16) are buried, which have a cavity (17) which is enclosed by a thin shell (18).
2. Kältegerät nach Anspruch 1 , dadurch gekennzeichnet, dass der Hohlraum (17) mit Kohlenwasserstoffen gefüllt ist.2. Refrigerating appliance according to claim 1, characterized in that the cavity (17) is filled with hydrocarbons.
3. Kältegerät nach Anspruch 2, dadurch gekennzeichnet, dass die Micro-Kügelchen (16) einen Durchmesser zwischen 5 und 30 μm aufweisen.3. Refrigerating appliance according to claim 2, characterized in that the micro-beads (16) have a diameter between 5 and 30 microns.
4. Kältegerät nach Anspruch 3, dadurch gekennzeichnet, dass der Polyurethan-Schaum Micro-Kügelchen (16) in einem Anteil von 1 bis 5 Vol.% enthält.4. Refrigerating appliance according to claim 3, characterized in that the polyurethane foam contains micro-beads (16) in a proportion of 1 to 5 vol.%.
5. Kältegerät nach Anspruch 4, dadurch gekennzeichnet, dass der Innenraum (2) durch eine Innenschale (19) begrenzt ist und die Isolierung (6) zwischen der Innenschale (19) und einem Außengehäuse (20) angeordnet ist.5. Refrigerating appliance according to claim 4, characterized in that the interior space (2) by an inner shell (19) is limited and the insulation (6) between the inner shell (19) and an outer housing (20) is arranged.
6. Kältegerät nach Anspruch 4, dadurch gekennzeichnet, dass die Isolierung in Form von Verbundplatten vorgefertigt ist.6. Refrigerating appliance according to claim 4, characterized in that the insulation is prefabricated in the form of composite panels.
7. Verfahren zur Herstellung eines Kältegeräts (1 ) nach Anspruch 5, dadurch gekennzeichnet, dass die Komponenten zur Erzeugung des Polyurethan-Schaums in den Raum zwischen der Innenschale (19) und dem Außengehäuse (20) unter Hochdruck durch eine Einspritzöffnung (7) eingespritzt werden. 7. A method for producing a refrigeration device (1) according to claim 5, characterized in that the components for producing the polyurethane foam in the space between the inner shell (19) and the outer housing (20) injected under high pressure through an injection port (7) become.
8. Verfahren nach Anspruch 7, dadurch gekennzeichnet, dass die Komponenten vor der Einspritzöffnung (7) in einem Mischkopf (8) zusammengeführt werden.8. The method according to claim 7, characterized in that the components are brought together before the injection opening (7) in a mixing head (8).
9. Verfahren nach Anspruch 8, dadurch gekennzeichnet, dass die Micro-Kügelchen (16) vor dem Mischkopf (8) einer der Komponenten zugemischt werden.9. The method according to claim 8, characterized in that the micro-beads (16) in front of the mixing head (8) are admixed to one of the components.
10. Verfahren nach Anspruch 8, dadurch gekennzeichnet, dass die Micro-Kügelchen (16) in dem Mischkopf (8) gleichzeitig mit den Komponenten zusammengemischt werden. 10. The method according to claim 8, characterized in that the micro-beads (16) are mixed together in the mixing head (8) simultaneously with the components.
PCT/EP2008/067279 2007-12-21 2008-12-11 Refrigerator and method for producing a refrigerator WO2009080535A2 (en)

Priority Applications (2)

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EP08865877A EP2225511A2 (en) 2007-12-21 2008-12-11 Refrigerator and method for producing a refrigerator
CN2008801222613A CN101903723A (en) 2007-12-21 2008-12-11 Refrigerator and method for producing a refrigerator

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DE102007062000.6 2007-12-21
DE200710062000 DE102007062000A1 (en) 2007-12-21 2007-12-21 Refrigeration device and method for producing a refrigeration device

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DE102013101592A1 (en) * 2013-02-18 2014-08-21 Rehau Ag + Co. Use of a polymer composition for foaming at least one hollow chamber of a plastic hollow chamber profile and thereby obtained plastic hollow chamber profile
US10429125B2 (en) * 2015-12-08 2019-10-01 Whirlpool Corporation Insulation structure for an appliance having a uniformly mixed multi-component insulation material, and a method for even distribution of material combinations therein
DE102018126974B4 (en) 2018-10-29 2021-05-27 SCHÜCO International KG Hollow chamber profile, in particular for facade, window and / or door construction and for components in the field of sun protection, as well as a method for producing a hollow chamber profile and a device for carrying out the method

Citations (3)

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Publication number Priority date Publication date Assignee Title
US4303431A (en) 1979-07-20 1981-12-01 Torobin Leonard B Method and apparatus for producing hollow microspheres
FR2515798A1 (en) 1981-10-29 1983-05-06 Bauknecht Gmbh G FRIDGE
US5171346A (en) 1991-01-22 1992-12-15 Aktiebolaget Electrolux Method of forming a composite thermal insulating material

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
US4303431A (en) 1979-07-20 1981-12-01 Torobin Leonard B Method and apparatus for producing hollow microspheres
FR2515798A1 (en) 1981-10-29 1983-05-06 Bauknecht Gmbh G FRIDGE
US5171346A (en) 1991-01-22 1992-12-15 Aktiebolaget Electrolux Method of forming a composite thermal insulating material

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EP2225511A2 (en) 2010-09-08

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