WO2007115876A2 - Refrigeration device comprising a defrost heater - Google Patents

Refrigeration device comprising a defrost heater Download PDF

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Publication number
WO2007115876A2
WO2007115876A2 PCT/EP2007/052290 EP2007052290W WO2007115876A2 WO 2007115876 A2 WO2007115876 A2 WO 2007115876A2 EP 2007052290 W EP2007052290 W EP 2007052290W WO 2007115876 A2 WO2007115876 A2 WO 2007115876A2
Authority
WO
WIPO (PCT)
Prior art keywords
air passage
evaporator
heating coil
refrigerating appliance
appliance according
Prior art date
Application number
PCT/EP2007/052290
Other languages
German (de)
French (fr)
Other versions
WO2007115876A3 (en
Inventor
Jochen HÄRLEN
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 EP07726799A priority Critical patent/EP2005088A2/en
Priority to US12/225,951 priority patent/US20090165486A1/en
Publication of WO2007115876A2 publication Critical patent/WO2007115876A2/en
Publication of WO2007115876A3 publication Critical patent/WO2007115876A3/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
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/06—Removing frost
    • F25D21/08—Removing frost by electric heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
    • F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
    • F25D17/06—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation
    • F25D17/067—Evaporator fan units
    • 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
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/14—Collecting or removing condensed and defrost water; Drip trays
    • 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
    • F25D2317/00—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass
    • F25D2317/06—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass with forced air circulation
    • F25D2317/065—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass with forced air circulation characterised by the air return
    • F25D2317/0655—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass with forced air circulation characterised by the air return through the top
    • 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
    • F25D2317/00—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass
    • F25D2317/06—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass with forced air circulation
    • F25D2317/068—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass with forced air circulation characterised by the fans
    • F25D2317/0683—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass with forced air circulation characterised by the fans the fans not of the axial type
    • 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
    • F25D2321/00—Details or arrangements for defrosting; Preventing frosting; Removing condensed or defrost water, not provided for in other groups of this subclass
    • F25D2321/14—Collecting condense or defrost water; Removing condense or defrost water
    • F25D2321/144—Collecting condense or defrost water; Removing condense or defrost water characterised by the construction of drip water collection pans
    • F25D2321/1441—Collecting condense or defrost water; Removing condense or defrost water characterised by the construction of drip water collection pans inside a refrigerator
    • 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
    • F25D2500/00—Problems to be solved
    • F25D2500/02—Geometry problems

Definitions

  • the present invention relates to a refrigerator with a storage chamber and an evaporator chamber, which communicates with the storage chamber via a cold air passage and a hot air passage and containing an evaporator, is cooled at which from the storage chamber incoming air and then returned to the storage chamber.
  • Such refrigerators are also referred to as no-frost devices.
  • Warm air which flows from the storage chamber into the evaporator chamber, causes moisture, which tends to precipitate on the evaporator, so that in the course of operation of the refrigerator, a layer of ice grows. In order to avoid a deterioration in the efficiency of the device, this ice layer must be removed from time to time.
  • a defrost heater is conventionally mounted in the evaporator chamber, which thaw the ice on the evaporator and drain. The resulting condensation collects at the lowest point of the evaporator chamber and from there passes through a passage to the outside, where it can evaporate.
  • the evaporator For the defrost to start at all, the evaporator must first be warmed to 0 9 C from an operating temperature below 0 9 C, and after the end of the defrost cycle, the evaporator must be cooled down to its operating temperature before returning to the storage chamber can be cooled.
  • heat inevitably flows from the evaporator chamber during defrosting into the storage chamber, the latter subsequently having to be withdrawn again. Such a flow of heat is the stronger, the higher the temperature in the evaporator chamber during defrosting.
  • this object can be achieved according to the invention in a simple manner by a defrost heater which has a higher heat density in a region adjacent to the hot air passage than in an area adjacent to the cold air passage.
  • the air flowing through the evaporator chamber discharges its entrained moisture predominantly in a region of the evaporator adjacent to the hot air passage, so that there the ice layer increases more rapidly in thickness than in an area adjacent to the cold air passage. Accordingly, by applying a higher heating power density to the vicinity of the hot air passage adjacent to the cold air passage, the ice thaws faster in the area adjacent to the warm air passage, so that the ice sheet is degraded substantially over the entire evaporator at the same time , A heating of already defrosted areas, which leads there to a strong increase in temperature, can be avoided.
  • the heater is preferably plate-shaped, so that it can be placed along a main side of the evaporator.
  • the heater extends below the evaporator so that heated air can rise through the evaporator.
  • the heater has a carrier plate and a heating coil arranged on the carrier plate.
  • the heating coil may be materially secured to the support plate, for example by soldering, to ensure good heat transfer from the heating coil to the plate. An attachment of the heating coil to the plate by latching is also considered.
  • the heating coil is preferably arranged on a side facing the evaporator side of the plate. It should also be spaced from the plate for at least part of its length, on the one hand so as not to affect the outflow of condensate dripping from the evaporator onto the plate, and on the other hand to drain heat from the heating coil to the plate, reducing the effectiveness of the process Heat radiation would reduce, limit.
  • the plate is made of a material such as a metal that efficiently reflects incident heat radiation so as to still direct heat radiation emitted from the heating coil in a direction away from the evaporator to the evaporator ,
  • the heating coil is arranged in the area adjacent to the hot air passage denser than in the region of the support plate adjacent to the cold air passage. This allows the use of a heating coil with consistent throughout its length heating power per unit length.
  • Obstruction of the airflow passing through the evaporator chamber through the heating coil can be minimized if the latter is arranged in serpentine lines extending in the passage direction of the air.
  • at least one of the serpentines is arranged completely on the hot air passage adjacent region of the support plate.
  • the heating coil may have a higher heating power per unit length in the region adjacent to the hot air passage than in the region adjacent to the cold air passage. Then, a different distribution of the Schumans emphasize is also feasible if the heating coil is arranged in both areas according to the same pattern.
  • the heating coil comprises two sections connected in series, one of which fills the region adjacent to the warm air passage and the other the region adjacent to the cold air passage.
  • the heating coil can each be arranged separately in serpentines, which extend in the passage direction of the air through the evaporator chamber.
  • a condensation channel is provided, converges in the condensation water from the evaporator, it may be appropriate to lead a portion of the heating coil along the drainage channel to ensure that do not prevent ice residues in the drainage channel drainage of the condensation water from the evaporator and dammed Condensate water freezes again after the end of the defrosting process.
  • FIG. 1 shows a schematic section through an inventive refrigeration device.
  • FIG. 2 shows a perspective view of the evaporator housing of the refrigerating appliance from FIG. 1 with defrost heating arranged therein;
  • Fig. 3 is a plan view of the evaporator housing and the evaporator mounted therein according to a second embodiment of the invention.
  • Fig. 4 is a schematic partial section through an evaporator housing according to a third embodiment of the invention.
  • Fig. 1 shows a schematic section through the upper portion of a refrigeration device according to the invention.
  • the refrigerator has a body 1 and a door 2, which are each realized in a conventional manner as filled with a heat-insulating foam layer 3 hollow body.
  • the interior of the body 1 is divided by a likewise heat-insulating partition 4 into an evaporator chamber 5 and a storage chamber 6.
  • the evaporator chamber 5 is largely filled by a housing 7 of an evaporator assembly in the interior of an evaporator 8 of known type with parallel to the cutting plane running lamellas and a transverse to the slats in serpentine refrigerant pipe is mounted. Below the Evaporator 8 is at the bottom of the housing 7, a defrost heater 15 is mounted.
  • the housing 7 has a hot air passage 9 on its side facing the door 2, passes through the hot air from the storage chamber 6 into the evaporator chamber 5, and a passage 10 on its rear wall of the body 1 side facing 19, behind which a fan 1 1 with Paddle wheel 12 and motor 13 is housed, the air from the housing 7 deducted and presses in a cold air passage 14 to the storage chamber 6.
  • FIG. 2 shows a perspective view of the housing 7 and the defrost heater 15 mounted therein.
  • the housing 7 has a flat, slightly sloping bottom plate 18 which forms the defrost heater 15 with an electrically operated heating coil mounted thereon.
  • the bottom plate 18 is made of metal or plastic, which is metallically coated on its upper side, in order to direct heat radiation radiated downwards by the heating coil onto the evaporator 8.
  • a gutter 20 which extends over the entire width of the housing 7 and is inclined to a drain opening 21.
  • the heating coil comprises a plurality of extending in the depth direction of the body 1 serpentine 16, 17.
  • the serpentine 16, 17 are held on the bottom plate 18 by means of protruding from the bottom plate 18 elastic brackets 22.
  • the brackets 22 keep the heating coil from the bottom plate 18 spaced so that condensation, which drips from the evaporator 8 to the bottom plate 18, can flow unhindered by the heating coil into the gutter 20.
  • serpentines 16 and 17 respectively alternate in the width direction of the bottom plate 18, which extend only below a region of the evaporator 8 adjacent to the hot air passage 9 or under the entire evaporator 8 and thus form two sections with different heating power densities.
  • serpentines could also be provided in more than two different length stages, but all of them emanating from the side of the evaporator 8 facing the hot air passage 9 in order to heat this area of the evaporator 8, which is the most icing in operation, most intensely.
  • a rectilinear section 23 of the Heating coil extends along the gutter 20 to ensure that in this no pieces of ice can be left behind, which hinder the drainage of the dew water.
  • FIG. 3 shows a plan view of an evaporator housing 7 with an evaporator 8 and a defrost heater 25 according to a second embodiment of the invention.
  • the shape of the housing 7 with bottom plate 18 and gutter 20 is the same as described with reference to FIG. 2, and also the evaporator 8 with a refrigerant tube 29 held in fins 28 is identical to that described with reference to FIG.
  • the heating coil 25 has two sections 26, 27, which differ in their heating power per unit length.
  • the more powerful section 26 extends below the portion of the evaporator 8 adjacent to the hot air passage 9, and the less efficient portion 27 below the portion of the evaporator adjacent to the rear wall 19 and thus to the cold air passage.
  • Both sections 26, 27 are laid according to the same pattern, in the form of elongated serpentines 30 in the depth direction of the body.
  • Fig. 4 shows in section a third embodiment of the invention.

Abstract

The invention relates to a storage compartment (6) and an evaporator compartment (5) communicating with said storage compartment (6) via a cold air passage (14) and a hot air passage (9) and comprising an evaporator (8) and a defrost heater (15). Said defrost heater (15), in a region adjacent to the hot air passage (9), has a higher heating power density than in a region adjacent to the cold air passage (10).

Description

Kältegerät mit Abtauheizung Refrigerating appliance with defrost heating
Die vorliegende Erfindung betrifft ein Kältegerät mit einer Lagerkammer und einer Verdampferkammer, die mit der Lagerkammer über einen Kaltluftdurchgang und einen Warmluftdurchgang kommuniziert und die einen Verdampfer enthält, an welchem aus der Lagerkammer zuströmende Luft abgekühlt und anschließend in die Lagerkammer zurückgeführt wird. Derartige Kältegeräte werden auch als No-Frost-Geräte bezeichnet.The present invention relates to a refrigerator with a storage chamber and an evaporator chamber, which communicates with the storage chamber via a cold air passage and a hot air passage and containing an evaporator, is cooled at which from the storage chamber incoming air and then returned to the storage chamber. Such refrigerators are also referred to as no-frost devices.
Warme Luft, die aus der Lagerkammer in die Verdampferkammer strömt, führt Feuchtigkeit mit sich, die dazu neigt, sich am Verdampfer niederzuschlagen, so dass auf diesem im Laufe des Betriebs des Kältegerätes eine Eisschicht wächst. Um eine Verschlechterung des Wirkungsgrades des Gerätes zu vermeiden, muss diese Eisschicht von Zeit zu Zeit beseitigt werden. Zu diesem Zweck ist herkömmlicherweise in der Verdampferkammer eine Abtauheizung angebracht, die das Eis am Verdampfer auftauen und abfließen lässt. Das entstehende Tauwasser sammelt sich am tiefsten Punkt der Verdampfer- kammer und gelangt von dort durch einen Durchgang ins Freie, wo es verdunsten kann.Warm air, which flows from the storage chamber into the evaporator chamber, causes moisture, which tends to precipitate on the evaporator, so that in the course of operation of the refrigerator, a layer of ice grows. In order to avoid a deterioration in the efficiency of the device, this ice layer must be removed from time to time. For this purpose, a defrost heater is conventionally mounted in the evaporator chamber, which thaw the ice on the evaporator and drain. The resulting condensation collects at the lowest point of the evaporator chamber and from there passes through a passage to the outside, where it can evaporate.
Der Abtauvorgang belastet die Energiebilanz eines solchen Kältegerätes, da die Heizenergie nicht vollständig zum Abtauen des Eises genutzt werden kann. Damit das Abtauen überhaupt beginnen kann, muss nämlich zunächst der Verdampfer von einer Betriebstemperatur, die unter O9C liegt, auf O9C erwärmt werden, und nach dem Ende des Abtauvorganges muss der Verdampfer wieder auf seine Betriebstemperatur heruntergekühlt werden, bevor wieder die Lagerkammer gekühlt werden kann. Außerdem fließt aus der Verdampferkammer während des Abtauens unvermeidlicherweise Wärme in die Lagerkammer ab, die letzterer anschließend wieder entzogen werden muss. Ein solcher Abfluss von Wärme ist um so stärker, je höher die Temperatur in der Verdampferkammer während des Abtauens ist.The defrosting burdened the energy balance of such a refrigerator, since the heating energy can not be fully used to defrost the ice. For the defrost to start at all, the evaporator must first be warmed to 0 9 C from an operating temperature below 0 9 C, and after the end of the defrost cycle, the evaporator must be cooled down to its operating temperature before returning to the storage chamber can be cooled. In addition, heat inevitably flows from the evaporator chamber during defrosting into the storage chamber, the latter subsequently having to be withdrawn again. Such a flow of heat is the stronger, the higher the temperature in the evaporator chamber during defrosting.
Um den Energieverbrauch beim Abtauen zu minimieren, ist es daher wünschenswert, in der Verdampferkammer eine möglichst homogene Temperaturverteilung zu realisieren, die den Gefrierpunkt nur knapp überschreitet. Überraschenderweise ist dieses Ziel erfindungsgemäß auf einfache Weise durch eine Abtauheizung erreichbar, die in einem dem Warmluftdurchgang benachbarten Bereich eine höhere Heizleistungsdichte aufweist als in einem dem Kaltluftdurchgang benachbarten Bereich.In order to minimize the energy consumption during defrosting, it is therefore desirable to realize in the evaporator chamber as homogeneous a temperature distribution as possible, which only just exceeds the freezing point. Surprisingly, this object can be achieved according to the invention in a simple manner by a defrost heater which has a higher heat density in a region adjacent to the hot air passage than in an area adjacent to the cold air passage.
Der Grund hierfür ist, dass die durch die Verdampferkammer fließende Luft ihre mitgeführte Feuchtigkeit überwiegend in einem dem Warmluftdurchgang benachbarten Bereich des Verdampfers ablädt, so dass dort die Eisschicht schneller an Dicke zunimmt als in einem dem Kaltluftdurchgang benachbarten Bereich. Indem entsprechend der dem Warmluftdurchgang benachbarte Bereich des Verdampfers mit einer höheren Heizleistungsdichte beaufschlagt wird als der dem Kaltluftdurchgang benachbarte Bereich, taut das Eis in dem dem Warmluftdurchgang benachbarten Bereich schneller, so dass die Eisschicht im Wesentlichen über den gesamten Verdampfer hinweg in der gleichen Zeit abgebaut wird. Eine Beheizung bereits abgetauter Bereiche, die dort zu einer starken Temperaturerhöhung führt, kann vermieden werden.The reason for this is that the air flowing through the evaporator chamber discharges its entrained moisture predominantly in a region of the evaporator adjacent to the hot air passage, so that there the ice layer increases more rapidly in thickness than in an area adjacent to the cold air passage. Accordingly, by applying a higher heating power density to the vicinity of the hot air passage adjacent to the cold air passage, the ice thaws faster in the area adjacent to the warm air passage, so that the ice sheet is degraded substantially over the entire evaporator at the same time , A heating of already defrosted areas, which leads there to a strong increase in temperature, can be avoided.
Die Heizung ist vorzugsweise plattenförmig ausgebildet, so dass sie entlang einer Hauptseite des Verdampfers platzierbar ist.The heater is preferably plate-shaped, so that it can be placed along a main side of the evaporator.
Vorzugsweise erstreckt sich die Heizung unterhalb des Verdampfers, so dass an ihr erwärmte Luft durch den Verdampfer aufsteigen kann.Preferably, the heater extends below the evaporator so that heated air can rise through the evaporator.
Vorzugsweise weist die Heizung eine Trägerplatte und eine auf der Trägerplatte angeordnete Heizschlange auf.Preferably, the heater has a carrier plate and a heating coil arranged on the carrier plate.
Die Heizschlange kann an der Trägerplatte materialschlüssig, zum Beispiel durch Löten, befestigt sein, um eine gute Wärmeübertragung von der Heizschlange auf die Platte zu gewährleisten. Eine Befestigung der Heizschlange an der Platte durch Verrasten kommt ebenfalls in Betracht.The heating coil may be materially secured to the support plate, for example by soldering, to ensure good heat transfer from the heating coil to the plate. An attachment of the heating coil to the plate by latching is also considered.
Um eine Beheizung des Verdampfers auch durch Strahlung zu begünstigen, ist die Heizschlange vorzugsweise an einer dem Verdampfer zugewandten Seite der Platte angeordnet. Sie sollte ferner auf wenigstens einem Teil ihrer Länge von der Platte beabstandet sein, einerseits um den Abfluss von Tauwasser, das vom Verdampfer auf die Platte tropft, nicht zu beeinträchtigen, andererseits um einen Abfluss von Wärme von der Heizschlange zur Platte, der die Effektivität der Wärmeabstrahlung verringern würde, zu begrenzen.In order to promote a heating of the evaporator by radiation, the heating coil is preferably arranged on a side facing the evaporator side of the plate. It should also be spaced from the plate for at least part of its length, on the one hand so as not to affect the outflow of condensate dripping from the evaporator onto the plate, and on the other hand to drain heat from the heating coil to the plate, reducing the effectiveness of the process Heat radiation would reduce, limit.
Zweckmäßig ist es in einem solchen Fall auch, wenn die Platte aus einem Material wie etwa einem Metall besteht, das auftreffende Wärmestrahlung effizient reflektiert, um so Wärmestrahlung, die von der Heizschlange in eine vom Verdampfer abgewandten Richtung abgestrahlt wird, dennoch auf den Verdampfer zu lenken.It is also useful in such a case, when the plate is made of a material such as a metal that efficiently reflects incident heat radiation so as to still direct heat radiation emitted from the heating coil in a direction away from the evaporator to the evaporator ,
Einer ersten Ausgestaltung zufolge ist die Heizschlange in dem dem Warmluftdurchgang benachbarten Bereich dichter angeordnet als in dem dem Kaltluftdurchgang benachbarten Bereich der Trägerplatte. Dies ermöglicht die Verwendung einer Heizschlange mit auf ihrer gesamten Länge gleichbleibender Heizleistung pro Längeneinheit.According to a first embodiment, the heating coil is arranged in the area adjacent to the hot air passage denser than in the region of the support plate adjacent to the cold air passage. This allows the use of a heating coil with consistent throughout its length heating power per unit length.
Eine Behinderung der durch die Verdampferkammer verlaufenden Luftströmung durch die Heizschlange kann gering gehalten werden, wenn letztere in sich in Durchgangsrichtung der Luft erstreckenden Serpentinen angeordnet ist. Um die unterschiedliche Verteilung der Heizleistung zu realisieren, ist dann vorzugsweise wenigstens eine der Serpentinen vollständig auf dem dem Warmluftdurchgang benachbarten Bereich der Trägerplatte angeordnet.Obstruction of the airflow passing through the evaporator chamber through the heating coil can be minimized if the latter is arranged in serpentine lines extending in the passage direction of the air. In order to realize the different distribution of the heating power, then preferably at least one of the serpentines is arranged completely on the hot air passage adjacent region of the support plate.
Einer zweiten Ausgestaltung zufolge kann die Heizschlange in dem dem Warmluftdurchgang benachbarten Bereich eine höhere Heizleistung pro Längeneinheit aufweisen als in dem dem Kaltluftdurchgang benachbarten Bereich. Dann ist eine unterschiedliche Verteilung der Heizleistungsdichte auch realisierbar, wenn die Heizschlange in beiden Bereichen nach dem gleichen Muster angeordnet ist.According to a second embodiment, the heating coil may have a higher heating power per unit length in the region adjacent to the hot air passage than in the region adjacent to the cold air passage. Then, a different distribution of the Heizleistungsdichte is also feasible if the heating coil is arranged in both areas according to the same pattern.
Um den Aufbau der Heizschlange einfach zu halten, ist es in diesem letzteren Fall bevorzugt, dass die Heizschlange zwei in Reihe verbundene Abschnitte umfasst, von denen einer den dem Warmluftdurchgang benachbarten Bereich und der andere den dem Kaltluftdurchgang benachbarten Bereich ausfüllt. In den zwei Abschnitten kann die Heizschlange jeweils getrennt voneinander in Serpentinen angeordnet sein, die sich in Durchgangsrichtung der Luft durch die Verdampferkammer erstrecken.In order to keep the structure of the heating coil simple, it is preferred in this latter case that the heating coil comprises two sections connected in series, one of which fills the region adjacent to the warm air passage and the other the region adjacent to the cold air passage. In the two sections, the heating coil can each be arranged separately in serpentines, which extend in the passage direction of the air through the evaporator chamber.
Wenn am Boden der Verdampferkammer eine Tauwasserrinne vorgesehen ist, in der Tauwasser vom Verdampfer zusammenläuft, kann es zweckmäßig sein, einen Abschnitt der Heizschlange entlang der Tauwasserrinne zu führen, um sicherzustellen, dass nicht Eisreste in der Tauwasserrinne ein Abfließen des Tauwassers vom Verdampfer verhindern und aufgestautes Tauwasser nach Ende des Abtauvorganges erneut gefriert.If at the bottom of the evaporator chamber a condensation channel is provided, converges in the condensation water from the evaporator, it may be appropriate to lead a portion of the heating coil along the drainage channel to ensure that do not prevent ice residues in the drainage channel drainage of the condensation water from the evaporator and dammed Condensate water freezes again after the end of the defrosting process.
Weitere Merkmale und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung von Ausführungsbeispielen unter Bezugnahme auf die beigefügten Figuren. Es zeigen:Further features and advantages of the invention will become apparent from the following description of embodiments with reference to the accompanying figures. Show it:
Fig. 1 einen schematischen Schnitt durch ein erfindungsgemäßes Kältegerät;1 shows a schematic section through an inventive refrigeration device.
Fig. 2 eine perspektivische Ansicht des Verdampfergehäuses des Kältegerätes aus Fig. 1 mit darin angeordneter Abtauheizung;FIG. 2 shows a perspective view of the evaporator housing of the refrigerating appliance from FIG. 1 with defrost heating arranged therein; FIG.
Fig. 3 eine Draufsicht auf das Verdampfergehäuse und den darin montierten Verdampfer gemäß einer zweiten Ausgestaltung der Erfindung; undFig. 3 is a plan view of the evaporator housing and the evaporator mounted therein according to a second embodiment of the invention; and
Fig. 4 einen schematischen Teilschnitt durch ein Verdampfergehäuse gemäß einer dritten Ausgestaltung der Erfindung.Fig. 4 is a schematic partial section through an evaporator housing according to a third embodiment of the invention.
Fig. 1 zeigt einen schematischen Schnitt durch den oberen Bereich eines erfindungsgemäßen Kältegerätes. Das Kältegerät hat einen Korpus 1 und eine Tür 2, die jeweils in herkömmlicher Weise als mit einer wärmeisolierenden Schaumstoffschicht 3 ausgefüllte Hohlkörper realisiert sind. Das Innere des Korpus 1 ist durch eine ebenfalls wärmeisolierende Trennwand 4 unterteilt in eine Verdampferkammer 5 und eine Lagerkammer 6. Die Verdampferkammer 5 ist größtenteils ausgefüllt durch ein Gehäuse 7 einer Verdampferbaugruppe, in dessen Innenraum ein Verdampfer 8 von an sich bekannter Bauart mit parallel zur Schnittebene verlaufenden Lamellen und einer quer zu den Lamellen in Serpentinen verlaufenden Kältemittelleitung montiert ist. Unterhalb des Verdampfers 8 ist am Boden des Gehäuses 7 eine Abtauheizung 15 angebracht. Das Gehäuse 7 hat einen Warmluftdurchgang 9 an seiner der Tür 2 zugewandten Seite, durch den Warmluft aus der Lagerkammer 6 in die Verdampferkammer 5 gelangt, und einen Durchgang 10 an seiner der Rückwand des Korpus 1 zugewandten Seite 19, hinter dem ein Ventilator 1 1 mit Schaufelrad 12 und Motor 13 untergebracht ist, der Luft aus dem Gehäuse 7 abzieht und in einen Kaltluftdurchgang 14 zur Lagerkammer 6 drückt.Fig. 1 shows a schematic section through the upper portion of a refrigeration device according to the invention. The refrigerator has a body 1 and a door 2, which are each realized in a conventional manner as filled with a heat-insulating foam layer 3 hollow body. The interior of the body 1 is divided by a likewise heat-insulating partition 4 into an evaporator chamber 5 and a storage chamber 6. The evaporator chamber 5 is largely filled by a housing 7 of an evaporator assembly in the interior of an evaporator 8 of known type with parallel to the cutting plane running lamellas and a transverse to the slats in serpentine refrigerant pipe is mounted. Below the Evaporator 8 is at the bottom of the housing 7, a defrost heater 15 is mounted. The housing 7 has a hot air passage 9 on its side facing the door 2, passes through the hot air from the storage chamber 6 into the evaporator chamber 5, and a passage 10 on its rear wall of the body 1 side facing 19, behind which a fan 1 1 with Paddle wheel 12 and motor 13 is housed, the air from the housing 7 deducted and presses in a cold air passage 14 to the storage chamber 6.
Fig. 2 zeigt eine perspektivische Ansicht des Gehäuses 7 und der darin montierten Abtauheizung 15. Das Gehäuse 7 hat eine ebene, nach hinten geringfügig abschüssige Bodenplatte 18, die mit einer darauf montierten elektrisch betriebene Heizschlange die Abtauheizung 15 bildet. Die Bodenplatte 18 besteht aus Metall oder aus Kunststoff, der an seiner Oberseite metallisch beschichtet ist, um von der Heizschlange nach unten abgestrahlte Wärmestrahlung nach oben auf den Verdampfer 8 zu lenken.FIG. 2 shows a perspective view of the housing 7 and the defrost heater 15 mounted therein. The housing 7 has a flat, slightly sloping bottom plate 18 which forms the defrost heater 15 with an electrically operated heating coil mounted thereon. The bottom plate 18 is made of metal or plastic, which is metallically coated on its upper side, in order to direct heat radiation radiated downwards by the heating coil onto the evaporator 8.
Zwischen der Bodenplatte 18 und der Rückwand 19 des Gehäuses 7 befindet sich an dessen Boden eine Ablaufrinne 20, die sich über die gesamte Breite des Gehäuses 7 erstreckt und zu einer Ablauföffnung 21 hin geneigt ist.Between the bottom plate 18 and the rear wall 19 of the housing 7 is located at the bottom of a gutter 20 which extends over the entire width of the housing 7 and is inclined to a drain opening 21.
Die Heizschlange umfasst eine Vielzahl von in Tiefenrichtung des Korpus 1 verlaufenden Serpentinen 16, 17. Die Serpentinen 16, 17 sind an der Bodenplatte 18 mit Hilfe von von der Bodenplatte 18 abstehenden elastischen Klammern 22 gehalten. Die Klammern 22 halten die Heizschlange von der Bodenplatte 18 beabstandet, so dass Tauwasser, das vom Verdampfer 8 auf die Bodenplatte 18 tropft, von der Heizschlange unbehindert in die Ablaufrinne 20 abfließen kann.The heating coil comprises a plurality of extending in the depth direction of the body 1 serpentine 16, 17. The serpentine 16, 17 are held on the bottom plate 18 by means of protruding from the bottom plate 18 elastic brackets 22. The brackets 22 keep the heating coil from the bottom plate 18 spaced so that condensation, which drips from the evaporator 8 to the bottom plate 18, can flow unhindered by the heating coil into the gutter 20.
Es wechseln sich in Breitenrichtung der Bodenplatte 18 kurze und lange Serpentinen 16 bzw. 17 ab, die sich jeweils nur unterhalb eines dem Warmluftdurchgang 9 benachbarten Bereichs des Verdampfers 8 oder unter dem gesamten Verdampfer 8 her erstrecken und so zwei Abschnitte mit unterschiedlichen Heizleistungsdichten bilden. Alternativ könnten auch Serpentinen in mehr als zwei verschiedenen Längenstufen vorgesehen sein, von denen jedoch alle von der dem Warmluftdurchgang 9 zugewandten Seite des Verdampfers 8 ausgehen, um diesen im Betrieb am stärksten vereisenden Bereich des Verdampfers 8 am intensivsten zu beheizen. Ein geradliniger Abschnitt 23 der Heizschlange erstreckt sich entlang der Ablaufrinne 20, um sicherzustellen, dass in dieser keine Eisstücke zurückbleiben können, die den Abfluss des Tauwassers behindern.Short and long serpentines 16 and 17 respectively alternate in the width direction of the bottom plate 18, which extend only below a region of the evaporator 8 adjacent to the hot air passage 9 or under the entire evaporator 8 and thus form two sections with different heating power densities. Alternatively, serpentines could also be provided in more than two different length stages, but all of them emanating from the side of the evaporator 8 facing the hot air passage 9 in order to heat this area of the evaporator 8, which is the most icing in operation, most intensely. A rectilinear section 23 of the Heating coil extends along the gutter 20 to ensure that in this no pieces of ice can be left behind, which hinder the drainage of the dew water.
Fig. 3 zeigt eine Draufsicht auf ein Verdampfergehäuse 7 mit einem Verdampfer 8 und einer Abtauheizung 25 gemäß einer zweiten Ausgestaltung der Erfindung. Die Gestalt des Gehäuses 7 mit Bodenplatte 18 und Ablaufrinne 20 ist die gleiche wie mit Bezug auf Fig. 2 beschrieben, und auch der Verdampfer 8 mit einem in Lamellen 28 gehaltenen Kältemittelrohr 29 ist mit dem mit Bezug auf Fig. 1 beschriebenen identisch. Die Heizschlange 25 hat zwei Abschnitte 26, 27, die sich in ihrer Heizleistung pro Längeneinheit unterscheiden. Der leistungsstärkere Abschnitt 26 verläuft unterhalb des dem Warmluftdurchgang 9 benachbarten Bereichs des Verdampfers 8, und der leistungsschwächere Abschnitt 27 unterhalb des der Rückwand 19 und damit dem Kaltluftdurchgang benachbarten Abschnittes des Verdampfers. Beide Abschnitte 26, 27 sind nach dem gleichen Muster, in Form von in Tiefenrichtung des Korpus langgestreckten Serpentinen 30, verlegt. Eine in Querrichtung des Korpus 1 verlaufende Serpentine 31 , die zu dem leistungsschwächeren Abschnitt 27 gehört, beheizt die Ablaufrinne 20.3 shows a plan view of an evaporator housing 7 with an evaporator 8 and a defrost heater 25 according to a second embodiment of the invention. The shape of the housing 7 with bottom plate 18 and gutter 20 is the same as described with reference to FIG. 2, and also the evaporator 8 with a refrigerant tube 29 held in fins 28 is identical to that described with reference to FIG. The heating coil 25 has two sections 26, 27, which differ in their heating power per unit length. The more powerful section 26 extends below the portion of the evaporator 8 adjacent to the hot air passage 9, and the less efficient portion 27 below the portion of the evaporator adjacent to the rear wall 19 and thus to the cold air passage. Both sections 26, 27 are laid according to the same pattern, in the form of elongated serpentines 30 in the depth direction of the body. A serpentine 31, which runs in the transverse direction of the body 1 and belongs to the less powerful portion 27, heats the drainage channel 20.
Fig. 4 zeigt im Schnitt eine dritte Ausgestaltung der Erfindung. Hier ist die HeizschlangeFig. 4 shows in section a third embodiment of the invention. Here is the heating coil
15 mit alternierenden langen und kurzen Serpentinen 16, 17 vom in Fig. 2 gezeigten Typ nicht von der Bodenplatte 18 beabstandet gehalten, sondern mit dieser durch Lot 32 gut wärmeleitend verbunden. Um zu verhindern, dass Tauwasser an den der Ablaufrinne 20 zugewandten Kurven 33 der Serpentinen staut, sind diese im Fall der kurzen Serpentinen15 with alternating long and short serpentine 16, 17 of the type shown in Fig. 2 is not kept at a distance from the bottom plate 18, but connected to this good solder by 32 good heat conducting. In order to prevent condensation on the serpentine curves 33 facing the drainage channel 20, these are in the case of the short serpentines
16 geringfügig aufwärts gebogen, so dass Wasser zwischen ihnen und der Bodenplatte 18 hindurchfließen kann; im Falle der langen Serpentinen 17 erstrecken sich die Kurven bis über die Ablaufrinne 20, so dass auch hier ein freier Abfluss gewährleistet ist. 16 bent slightly upward so that water can flow between them and the bottom plate 18; in the case of the long serpentines 17, the curves extend beyond the gutter 20, so that a free drain is ensured here as well.

Claims

Patentansprüche claims
1 . Kältegerät mit einer Lagerkammer (6) und einer Verdampferkammer (5), die mit der Lagerkammer (6) über einen Kaltluftdurchgang (14) und einen Warmluft- durchgang (9) kommuniziert und die einen Verdampfer (8) und eine Abtauheizung (15) enthält, dadurch gekennzeichnet, dass die Abtauheizung (15) in einem dem Warmluftdurchgang (9) benachbarten Bereich eine höhere Heizleistungsdichte aufweist als in einem dem Kaltluftdurchgang (14) benachbarten Bereich.1 . Refrigerating appliance with a storage chamber (6) and an evaporator chamber (5) which communicates with the storage chamber (6) via a cold air passage (14) and a hot air passage (9) and which contains an evaporator (8) and a defrost heater (15) , characterized in that the defrost heater (15) in a hot air passage (9) adjacent region has a higher heating power density than in a cold air passage (14) adjacent area.
2. Kältegerät nach Anspruch 1 , dadurch gekennzeichnet, dass die Abtauheizung (15) plattenförmig ausgebildet ist.2. Refrigerating appliance according to claim 1, characterized in that the defrost heater (15) is plate-shaped.
3. Kältegerät nach Anspruch 2, dadurch gekennzeichnet, dass die Abtauheizung (15) sich unterhalb des Verdampfers (8) erstreckt.3. Refrigerating appliance according to claim 2, characterized in that the defrost heater (15) extends below the evaporator (8).
4. Kältegerät nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Abtauheizung (15) eine Trägerplatte (18) und eine auf der Trägerplatte (18) angeordnete Heizschlange (16, 17; 26, 27) aufweist.4. Refrigerating appliance according to one of the preceding claims, characterized in that the defrost heater (15) has a carrier plate (18) and one on the support plate (18) arranged heating coil (16, 17, 26, 27).
5. Kältegerät nach Anspruch 4, dadurch gekennzeichnet, dass die Heizschlange (16, 17) auf der Trägerplatte (18) verrastet ist.5. Refrigerating appliance according to claim 4, characterized in that the heating coil (16, 17) on the support plate (18) is latched.
6. Kältegerät nach einem der Ansprüche 4 bis 5, dadurch gekennzeichnet, dass die Heizschlange (16, 17; 26, 27) an einer dem Verdampfer (8) zugewandten Seite der Trägerplatte (18) angeordnet und wenigstens auf einem Teil ihrer Länge von der Trägerplatte (18) beabstandet ist.6. Refrigerating appliance according to one of claims 4 to 5, characterized in that the heating coil (16, 17, 26, 27) arranged on a side facing the evaporator (8) side of the support plate (18) and at least over part of their length from the Support plate (18) is spaced.
7. Kältegerät nach einem der Ansprüche 4 bis 6, dadurch gekennzeichnet, dass die Heizschlange (16, 17) in dem dem Warmluftdurchgang (9) benachbarten Bereich dichter angeordnet ist als in dem dem Kaltluftdurchgang (14) benachbarten Bereich der Trägerplatte (18). 7. Refrigerating appliance according to one of claims 4 to 6, characterized in that the heating coil (16, 17) in the hot air passage (9) adjacent region is arranged denser than in the cold air passage (14) adjacent region of the support plate (18).
8. Kältegerät nach Anspruch 6, dadurch gekennzeichnet, dass die Heizschlange (16, 17; 26, 27) in sich in Durchgangsrichtung der Luft durch die Verdampferkammer (5) erstreckenden Serpentinen (16; 17; 30) angeordnet ist, wobei wenigstens eine der Serpentinen (16, 30) vollständig auf dem dem Warmluftdurchgang benachbarten Bereich der Trägerplatte (18) verläuft.8. Refrigerating appliance according to claim 6, characterized in that the heating coil (16, 17; 26, 27) is arranged in serpentines (16; 17; 30) extending in the passage direction of the air through the evaporator chamber (5), at least one of the Serpentine (16, 30) completely on the hot air passage adjacent area of the support plate (18).
9. Kältegerät nach einem der Ansprüche 4 bis 6, dadurch gekennzeichnet, dass die Heizschlange (26, 27) in dem dem Warmluftdurchgang (9) benachbarten Bereich eine höhere Heizleistung pro Längeneinheit aufweist als in dem dem Kaltluft- durchgang (14) benachbarten Bereich.9. Refrigerating appliance according to one of claims 4 to 6, characterized in that the heating coil (26, 27) in the hot air passage (9) adjacent region has a higher heating power per unit length than in the cold air passage (14) adjacent area.
10. Kältegerät nach Anspruch 9, dadurch gekennzeichnet, dass die Heizschlange zwei in Reihe verbundene Abschnitte (26; 27) umfasst, von denen einer (26) den dem Warmluftdurchgang (9) benachbarten Bereich und der andere (27) den dem Kaltluftdurchgang (14) benachbarten Bereich ausfüllt.10. Refrigerating appliance according to claim 9, characterized in that the heating coil comprises two series-connected sections (26; 27), of which one (26) the hot air passage (9) adjacent area and the other (27) the cold air passage (14 ) fills adjacent area.
1 1. Kältegerät nach Anspruch 10, dadurch gekennzeichnet, dass die zwei Abschnitte (26; 27) jeweils sich in Durchgangsrichtung der Luft durch die Verdampferkammer (5) erstreckende Serpentinen (30) aufweisen.1 1. Refrigerating appliance according to claim 10, characterized in that the two sections (26, 27) in each case in the passage direction of the air through the evaporator chamber (5) extending serpentine (30).
12. Kältegerät nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass am Boden der Verdampferkammer eine Tauwasserrinne (20) gebildet ist und ein Abschnitt (31 ) der Heizschlange entlang der Tauwasserrinne (20) verläuft. 12. Refrigerating appliance according to one of the preceding claims, characterized in that at the bottom of the evaporator chamber, a condensation channel (20) is formed and a portion (31) of the heating coil along the condensation channel (20).
PCT/EP2007/052290 2006-04-05 2007-03-12 Refrigeration device comprising a defrost heater WO2007115876A2 (en)

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EP07726799A EP2005088A2 (en) 2006-04-05 2007-03-12 Refrigeration device comprising a defrost heater
US12/225,951 US20090165486A1 (en) 2006-04-05 2007-03-12 Refrigeration device comprising a defrost heater

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DE102006015994A DE102006015994A1 (en) 2006-04-05 2006-04-05 Refrigerating appliance with defrost heating
DE102006015994.2 2006-04-05

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DE102006015994A1 (en) 2007-10-11
RU2008143426A (en) 2010-05-10
RU2419045C2 (en) 2011-05-20
US20090165486A1 (en) 2009-07-02
WO2007115876A3 (en) 2007-11-29

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