EP0121591B1 - Cooling or freezing apparatus - Google Patents

Cooling or freezing apparatus Download PDF

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Publication number
EP0121591B1
EP0121591B1 EP19830109421 EP83109421A EP0121591B1 EP 0121591 B1 EP0121591 B1 EP 0121591B1 EP 19830109421 EP19830109421 EP 19830109421 EP 83109421 A EP83109421 A EP 83109421A EP 0121591 B1 EP0121591 B1 EP 0121591B1
Authority
EP
European Patent Office
Prior art keywords
heat
aluminum sheet
aluminum
side walls
sheet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP19830109421
Other languages
German (de)
French (fr)
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EP0121591A1 (en
Inventor
Werner Kerpers
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AEG Hausgeraete GmbH
Original Assignee
Licentia Patent Verwaltungs 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 Licentia Patent Verwaltungs GmbH filed Critical Licentia Patent Verwaltungs GmbH
Publication of EP0121591A1 publication Critical patent/EP0121591A1/en
Application granted granted Critical
Publication of EP0121591B1 publication Critical patent/EP0121591B1/en
Expired legal-status Critical Current

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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
    • F25D23/061—Walls with conduit means

Definitions

  • the invention relates to a refrigerator or freezer according to the preamble of the claim.
  • a housing designed as a cabinet is provided with a door arranged on the vertical front side.
  • the rear side of the housing forms a condenser, which consists of an independent plate with heat-conducting tubes.
  • the pipes are located on the outer side of the plate facing away from the thermal insulation and run in horizontal loops.
  • the condenser sheet metal carrying the tubes has bent side edges on which the adjacent side edges of the side walls of the housing rest.
  • the horizontal loops of the tubes also represent flow resistances for the convection air rising thereon, so that the heat build-up is further increased.
  • the side edges of the side walls of the housing can be lifted from the bent side edge of the sheet forming the condenser by the pressure forces occurring in the heat insulation, so that the heat transfer to the side walls is deteriorated there. If the heat output from the condenser decreases, the cooling effect in the cooling device or the operating efficiency of the cooling device is reduced, and thus the power consumption is increased.
  • a freezer is also known (US-A-3 122 006), which is designed as a chest with a lid arranged on the top.
  • the entire outer housing consists of a single, two-layer aluminum sheet, on the side facing the heat insulation, tubes for guiding refrigerant are formed by compressed air.
  • the entire outer housing here forms a condenser which does not come into contact with other side walls of the housing.
  • a freezer of this type must also be arranged in the region of the side walls connecting the front and rear sides at a distance from adjacent walls in order to ensure heat dissipation there as well. They are therefore not suitable for installation in kitchen furniture like a cupboard.
  • An evaporator for cooling devices is also known (US Pat. No. 2,795,035). which consists of an aluminum sheet, on the side facing the thermal insulation, aluminum pipes for guiding the refrigerant are arranged. The smooth inner side of the aluminum sheet forms part of the inner wall of the cold room. The aluminum tubes are glued to the aluminum sheet. A connection of the aluminum sheet to adjacent side walls is not specified.
  • the invention has for its object to take measures in a refrigerator or freezer according to the preamble of the claim, through which a high heat dissipation from the condenser is permanently achieved with a simple, space-saving construction.
  • the heat dissipation is additionally increased permanently.
  • the heat transfer from the aluminum sheet to the housing side walls is therefore guaranteed even over long operating times. Since the aluminum tubes are arranged on the side of the aluminum sheet facing the thermal insulation, the outside of the condenser remains smooth, so that the convection air can pass unhindered and the heat emitted by the aluminum sheet can be dissipated without hindrance. Dust and other dirt particles can also only adhere to the smooth surface with difficulty, so that the heat is released optimally over a very long period of operation.
  • a cross section of a refrigerator or freezer is shown through a section through the back.
  • the space between the vertical rear side 1 of an inner container designed to hold the goods to be cooled and an aluminum sheet 2 running parallel to it and spaced apart is foamed with heat-insulating foam 3.
  • the aluminum sheet 2 forms the outer rear wall of the housing and at the same time forms part of the condenser. Accordingly, on the side facing the insulating foam 3, the aluminum sheet 2 is connected in a heat-conducting manner to a pipe 4 laid in several turns, through which the heated refrigerant coming from the compressor flows.
  • the tube 4 is also made of aluminum and is connected to the aluminum sheet 2 with good thermal conductivity.
  • the outward-facing side of the aluminum sheet remains without elevations, so that no dust or other dirt is deposited thereon and the heat emission can be reduced.
  • the aluminum tube is preferably glued to the aluminum sheet 2, so that a permanent, uniform heat transfer is ensured.

Description

Die Erfindung betrifft ein Kühl- oder Gefriergerät gemäß dem Oberbegriff des Patentanspruchs.The invention relates to a refrigerator or freezer according to the preamble of the claim.

Bei einem bekannten Kühlgerät dieser Art (US-A-2 961 851) ist ein als Schrank ausgebildetes Gehäuse mit einer an der senkrechten Frontseite angeordneten Tür vorgesehen. Die rückwärtige Seite des Gehäuses bildet ein Verflüssiger, der aus einem eigenständigen Blech mit wärmeleitend angebrachten Rohren besteht. Die Rohre befinden sich an der der Wärmeisolierung abgewandten äußeren Seite des Bleches und verlaufen in waagerechten Schleifen. Das die Rohre tragende Blech des Verflüssigers weist umgebogene Seitenränder auf, auf welchen außen die benachbarten Seitenkanten der Seitenwände des Gehäuses aufliegen. Bei diesem Aufbau können sich auf den waagerechten Teilen der Rohre Staub und andere Schmutzpartikel im Betrieb ablagern, die mit zunehmender Betriebsdauer des Kühlgerätes durch die Bildung immer dickerer Schichten die Wärmeabgabe zunehmend verschlechtern. Dabei stellen die waagerechten Schleifen der Rohre auch Strömungswiderstände für die daran aufsteigende Konvektionsluft dar, so daß der Wärmestau noch vergrößert wird. Außerdem können die Seitenkanten der Seitenwände des Gehäuses durch die in der Wärmeisolierung auftretenden Druckkräfte vom umgebogenen Seitenrand des den Verflüssiger bildenden Bleches abgehoben werden, so daß dort der Wärmeübergang zu den Seitenwänden verschlechtert wird. Bei Abnehmen der Wärmeabgabe vom Verflüssiger wird auch die Kühlwirkung im Kühlgerät bzw. der Betriebswirkungsgrad des Kühlgerätes herabgesetzt und damit der Stromverbrauch gesteigert.In a known cooling device of this type (US-A-2 961 851), a housing designed as a cabinet is provided with a door arranged on the vertical front side. The rear side of the housing forms a condenser, which consists of an independent plate with heat-conducting tubes. The pipes are located on the outer side of the plate facing away from the thermal insulation and run in horizontal loops. The condenser sheet metal carrying the tubes has bent side edges on which the adjacent side edges of the side walls of the housing rest. With this construction, dust and other dirt particles can accumulate on the horizontal parts of the pipes during operation, which increasingly deteriorate the heat emission with the increasing operating time of the cooling device due to the formation of thicker layers. The horizontal loops of the tubes also represent flow resistances for the convection air rising thereon, so that the heat build-up is further increased. In addition, the side edges of the side walls of the housing can be lifted from the bent side edge of the sheet forming the condenser by the pressure forces occurring in the heat insulation, so that the heat transfer to the side walls is deteriorated there. If the heat output from the condenser decreases, the cooling effect in the cooling device or the operating efficiency of the cooling device is reduced, and thus the power consumption is increased.

Im übrigen bewirken die außen aufgebrachten Rohre eine partielle Verengung des notwendigen Konvektionskanals an der Rückseite des Gerätes.In addition, the pipes placed on the outside cause the necessary convection duct to be partially narrowed at the rear of the device.

Es ist auch ein Gefriergerät bekannt (US-A-3 122 006), das als Truhe mit an der Oberseite angeordnetem Deckel ausgebildet ist. Dort besteht das gesamte Außengehäuse aus einem einzigen, zweischichtigen Aluminiumblech, an dessen der Wärmeisolierung zugewandten Seite durch Pressluft Rohre zur Führung von Kältemittel ausgebildet sind. Das gesamte Außengehäuse bildet hierbei einen Verflüssiger, der mit anderen Seitenwänden des Gehäuses nicht in Verbindung tritt. Eine Kühltruhe dieser Art muß im übrigen im Bereich der die Forder- und die Rückseite verbindenden Seitenwänden mit Abstand von benachbarten Wänden angeordnet werden, um auch dort die Wärmeabfuhr sicherzustellen. Sie sind daher nicht wie ein Schrank für den Einbau in Küchenmöbel geeignet.A freezer is also known (US-A-3 122 006), which is designed as a chest with a lid arranged on the top. There, the entire outer housing consists of a single, two-layer aluminum sheet, on the side facing the heat insulation, tubes for guiding refrigerant are formed by compressed air. The entire outer housing here forms a condenser which does not come into contact with other side walls of the housing. A freezer of this type must also be arranged in the region of the side walls connecting the front and rear sides at a distance from adjacent walls in order to ensure heat dissipation there as well. They are therefore not suitable for installation in kitchen furniture like a cupboard.

Ferner ist ein Verdampfer für Kühlgeräte bekannt (US-A-2 795 035). der aus einem Aluminiumblech besteht, auf dessen der Wärmeisolierung zugewandten Seite Aluminiumrohre zur Führung von Kältemittel angeordnet sind. Die glatte innere Seite des Aluminiumbleches bildet einen Teil der Innenwandung des Kühlraumes. Die Aluminiumrohre sind dabei auf das Aluminiumblech aufgeklebt. Eine Verbindung des Aluminiumblechs mit benachbarten Seitenwänden is nicht angegeben.An evaporator for cooling devices is also known (US Pat. No. 2,795,035). which consists of an aluminum sheet, on the side facing the thermal insulation, aluminum pipes for guiding the refrigerant are arranged. The smooth inner side of the aluminum sheet forms part of the inner wall of the cold room. The aluminum tubes are glued to the aluminum sheet. A connection of the aluminum sheet to adjacent side walls is not specified.

Der Erfindung liegt die Aufgabe zugrunde, bei einem Kühl- oder Gefriergerät gemäß dem Oberbegriff des Patentanspruchs Maßnahmen zu treffen, durch die bei einfachem, raumsparendem Aufbau dauerhaft eine hohe Wärmeabfuhr vom Verflüssiger erreicht wird.The invention has for its object to take measures in a refrigerator or freezer according to the preamble of the claim, through which a high heat dissipation from the condenser is permanently achieved with a simple, space-saving construction.

Die Lösung dieser Aufgabe erfolgt gemäß der Erfindung durch die kennzeichnenden Merkmale des Patentanspruchs.This object is achieved according to the invention by the characterizing features of the patent claim.

Bei einem Aufbau eines Kühl- oder Gefriergerätes gemäß der Erfindung wird durch die Anwendung eines Verflüssigers aus einem Aluminiumblech mit aufgebrachten Aluminiumrohren eine optimale Wärmeabfuhr von den das erhitzte Kältemittel führenden Aluminiumrohren und gleichzeitig eine rasche Verteilung der Wärme über die gesamte Fläche des Aluminiumblechs erreicht. Es steht daher eine sehr große wirksame Wärmeabgabefläche zur Verfügung.In the construction of a refrigerator or freezer according to the invention, an optimal heat dissipation from the aluminum tubes carrying the heated refrigerant and at the same time a rapid distribution of the heat over the entire surface of the aluminum plate is achieved by the use of a condenser made of an aluminum sheet with attached aluminum tubes. There is therefore a very large effective heat dissipation area available.

Durch die Anlage des Randes des Aluminiumblechs an den umgebogenen Seitenkanten der angrenzenden Seitenwände wird die Wärmeabfuhr zusätzlich dauerhaft gesteigert. Der Wärmeübergang von dem Aluminiumblech zu den Gehäuseseitenwänden ist daher auch über lange Betriebszeiten sicher gewährleistet. Da die Aluminiumrohre auf der der Wärmeisolierung zugewandten Seite des Aluminiumblechs angeordnet sind, bleibt die Außenseite des Verflüssigers glatt, so daß die Konvektionsluft ungehindert vorbeistreichen und die vom Aluminiumblech abgegebene Wärme ohne Behinderung abführen kann. An der glatten Oberfläche können sich auch Staub und andere Schmutzpartikel nur schwer festsetzen, so daß die Wämeabgabe über eine sehr lange Betriebsdauer optimal gegeben ist.By placing the edge of the aluminum sheet on the bent side edges of the adjacent side walls, the heat dissipation is additionally increased permanently. The heat transfer from the aluminum sheet to the housing side walls is therefore guaranteed even over long operating times. Since the aluminum tubes are arranged on the side of the aluminum sheet facing the thermal insulation, the outside of the condenser remains smooth, so that the convection air can pass unhindered and the heat emitted by the aluminum sheet can be dissipated without hindrance. Dust and other dirt particles can also only adhere to the smooth surface with difficulty, so that the heat is released optimally over a very long period of operation.

Ein Ausführungsbeispiel der Erfindung wird nachstehend näher erläutert.An embodiment of the invention is explained in more detail below.

Von einem Kühl- oder Gefriergerät ist ein Querschnitt durch einen Abschnitt durch die Rückseite dargestellt. Dabei ist der Raum zwischen der senkrechten Rückseite 1 eines für die Aufnahme des zu kühlenden Gutes ausgebildeten Innenbehälters und einem parallel dazu mit Abstand verlaufenden Aluminiumblech 2 mit wärmeisolierendem Schaumstoff 3 ausgeschäumt. Das Aluminiumblech 2 bildet die äußere Rückwand des Gehäuses und stellt zugleich einen Teil des Verflüssigers dar. Mit dem Aluminiumblech 2 ist dementsprechend an der dem Isolierschaum 3 zugewandten Seite ein in mehreren Windungen verlegtes Rohr 4 wärmeleitend verbunden, durch welches das vom Kompressor kommende, erhitzte Kältemittel strömt. Das Rohr 4 besteht ebenfalls aus Aluminium und ist gut wärmeleitend mit dem Aluminiumblech 2 verbunden. Es wird dadurch ein optimaler Wärmeübergang zwischen dem Aluminiumrohr 4 und dem Aluminiumblech 2 erreicht, das die aufgenommene Wärme in sich aufgrund seiner hohen Wärmeleitfähigkeit gleichmäßig verteilt und dadurch eine große wärmeabgebende Fläche bildet. Zusätzlich ist das Aluminiumblech 2 noch wärmeleitend mit den umgebogenen Seitenkanten 5 von angrenzenden Seitenwänden des Gehäuses verbunden, so daß vom Aluminiumblech 2 auch Wärme zu diesen Seitenwänden abgeleitet wird. Für die Abführung der abzugebenden Wärme ist somit nur ein einziger, relativ schmaler Konvektionskanal 6 zwischen dem Aluminiumblech 2 und einer benachbarten Wand 7 erfoderlich. Bei vorgegebener Stärke der Wärmeisolierschicht 3 kann dementsprechend die Rückseite des Innenbehälters gegenüber der Gerätetür tiefer gesetzt werden, als es bei zweizügiger Ausführung des Konvektionskanals möglich ist.A cross section of a refrigerator or freezer is shown through a section through the back. The space between the vertical rear side 1 of an inner container designed to hold the goods to be cooled and an aluminum sheet 2 running parallel to it and spaced apart is foamed with heat-insulating foam 3. The aluminum sheet 2 forms the outer rear wall of the housing and at the same time forms part of the condenser. Accordingly, on the side facing the insulating foam 3, the aluminum sheet 2 is connected in a heat-conducting manner to a pipe 4 laid in several turns, through which the heated refrigerant coming from the compressor flows. The tube 4 is also made of aluminum and is connected to the aluminum sheet 2 with good thermal conductivity. It will an optimal heat transfer between the aluminum tube 4 and the aluminum sheet 2 is achieved, which distributes the absorbed heat evenly due to its high thermal conductivity and thereby forms a large heat-emitting surface. In addition, the aluminum sheet 2 is still thermally connected to the bent side edges 5 of adjacent side walls of the housing, so that heat is also dissipated from the aluminum sheet 2 to these side walls. Thus, only a single, relatively narrow convection channel 6 between the aluminum sheet 2 and an adjacent wall 7 is required for the dissipation of the heat to be given off. For a given thickness of the heat insulation layer 3, the back of the inner container can accordingly be set lower than the device door than is possible with a two-pass design of the convection channel.

Durch die Anordnung der Aluminiumrohre 4 an der den Isolierschaum 3 zugewandten Seite des Aluminiumblechs 2 bleibt die nach außen weisende Seite des. Aluminiumblechs ohne Erhöhungen, so daß sich darauf auch kein Staub oder sonstiger Schmutz ablagern und die Wärmeabgabe mindern kann. Das Aluminiumrohr wird vorzugsweise auf das Aluminiumblech 2 aufgeklebt, so daß ein dauerhafter, gleichmäßiger Wärmeübergang sichergestellt ist.Due to the arrangement of the aluminum tubes 4 on the side of the aluminum sheet 2 facing the insulating foam 3, the outward-facing side of the aluminum sheet remains without elevations, so that no dust or other dirt is deposited thereon and the heat emission can be reduced. The aluminum tube is preferably glued to the aluminum sheet 2, so that a permanent, uniform heat transfer is ensured.

Claims (1)

  1. A refrigerator or freezer with a foam-insulated housing formed as a container, and a rearwardly arranged condenser comprised by a unitary metal sheet with suitable heat-conducting pipes, the metal sheet, as rear wall, being in heat conducting connection with the adjacent side walls of the housing, characterised in that the metal sheet (2) and the pipes (4) consist of aluminium, that the aluminium pipes (4) are arranged on the side of the aluminium sheet (2) that faces towards the insulating foam (3) and that the aluminium sheet (2) abuts against the inner faces of the bent- over side edges (5) of the said side walls.
EP19830109421 1983-03-08 1983-09-22 Cooling or freezing apparatus Expired EP0121591B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833308096 DE3308096A1 (en) 1983-03-08 1983-03-08 REFRIGERATOR OR FREEZER
DE3308096 1983-03-08

Publications (2)

Publication Number Publication Date
EP0121591A1 EP0121591A1 (en) 1984-10-17
EP0121591B1 true EP0121591B1 (en) 1986-11-12

Family

ID=6192791

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830109421 Expired EP0121591B1 (en) 1983-03-08 1983-09-22 Cooling or freezing apparatus

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EP (1) EP0121591B1 (en)
DE (1) DE3308096A1 (en)
DK (1) DK153908B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0797060B1 (en) * 1996-03-20 1999-03-24 Luigi Fieramonte Process for applying a sheet of aluminum to the outer surface of a refrigerating container, and composite ribbon article
ITVA20010040A1 (en) * 2001-11-09 2003-05-09 Whirlpool Co DOMESTIC REFRIGERATOR WITH IMPROVED THERMAL INSULATION

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2464606A (en) * 1944-08-24 1949-03-15 Nash Kelvinator Corp Refrigerating apparatus
US2483439A (en) * 1947-05-28 1949-10-04 Gen Motors Corp Refrigerating apparatus
US2543196A (en) * 1947-06-16 1951-02-27 Nash Kelvinator Corp Refrigerating apparatus having means to prevent wetting of insulation
US2509615A (en) * 1947-10-29 1950-05-30 Nash Kelvinator Corp Refrigerating apparatus having a removable panel unit
US2795035A (en) * 1955-08-03 1957-06-11 Revco Inc Method of making a refrigerated cabinet liner
US2961851A (en) * 1958-03-12 1960-11-29 Westinghouse Electric Corp Refrigeration apparatus
US2959939A (en) * 1958-05-01 1960-11-15 Carrier Corp Refrigerated storage unit
DE1845436U (en) * 1961-08-03 1962-01-25 Bbc Brown Boveri & Cie REFRIGERATED FURNITURE WITH EVAPORATOR OR COOLING MOUNTED IN THE THERMAL INSULATION. CONDENSER PIPES.
DE1844625U (en) * 1961-11-04 1962-01-11 Atlas As FREEZER.
US3122006A (en) * 1962-05-24 1964-02-25 Gen Motors Corp Refrigerating apparatus including cabinet structure
DE1864337U (en) * 1962-11-08 1962-12-27 Ver Deutsche Metallwerke Ag REFRIGERATED FURNITURE, SUCH AS REFRIGERATORS OR FREEZERS.
US3194622A (en) * 1963-02-08 1965-07-13 Studebaker Corp Freezer cabinet construction
US3373478A (en) * 1965-11-17 1968-03-19 Westinghouse Electric Corp Method of making refrigeration apparatus
DD98997A1 (en) * 1972-02-29 1973-07-12
UST945009I4 (en) * 1975-02-24 1976-04-06
DE2537835A1 (en) * 1975-08-26 1977-03-10 Environmental Container Corp Refrigerator system - comprises evaporator exterior metal skin wall and condenser
DE7708579U1 (en) * 1977-03-19 1977-07-07 Bosch-Siemens Hausgeraete Gmbh, 7000 Stuttgart REFRIGERATED FURNITURE, IN PARTICULAR REFRIGERATOR OR FREEZER

Also Published As

Publication number Publication date
DK153908B (en) 1988-09-19
DK56684A (en) 1984-09-09
EP0121591A1 (en) 1984-10-17
DE3308096A1 (en) 1984-09-20
DK56684D0 (en) 1984-02-09

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