EP2694895B1 - Evaporator assembly for a cooling device - Google Patents

Evaporator assembly for a cooling device Download PDF

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Publication number
EP2694895B1
EP2694895B1 EP12714634.8A EP12714634A EP2694895B1 EP 2694895 B1 EP2694895 B1 EP 2694895B1 EP 12714634 A EP12714634 A EP 12714634A EP 2694895 B1 EP2694895 B1 EP 2694895B1
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EP
European Patent Office
Prior art keywords
evaporator
heater
pipe
sections
evaporator assembly
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EP12714634.8A
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German (de)
French (fr)
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EP2694895A1 (en
Inventor
Michaela Malisi
Renate Pradel
Marcus WEHLAUCH
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BSH Hausgeraete GmbH
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BSH Hausgeraete GmbH
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Publication of EP2694895A1 publication Critical patent/EP2694895A1/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
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/06—Removing frost
    • F25D21/12—Removing frost by hot-fluid circulating system separate from the refrigerant system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
    • F28D1/047—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag
    • F28D1/0477—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag the conduits being bent in a serpentine or zig-zag
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/24—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely
    • F28F1/32—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely the means having portions engaging further tubular elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F17/00—Removing ice or water from heat-exchange apparatus
    • 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

Definitions

  • the present invention relates to an evaporator assembly for a refrigeration device, in particular a household refrigerator.
  • an evaporator assembly is housed in an evaporator chamber separated from a storage chamber, and the storage chamber is cooled by exchange of air with the evaporator chamber.
  • humidity from the storage chamber in the evaporator chamber precipitates as a frost and forms over time on the evaporator a layer of ice, which hinders the heat exchange. If the exchange of air between the storage and evaporator chamber is interrupted, it is possible to defrost the ice layer, without at the same time to heat the storage chamber strong.
  • A1 is a no-frost refrigeration device in which in an evaporator chamber on the one hand, an evaporator with a refrigerant pipe and a plurality of standing in thermal contact with the refrigerant pipe fins and the other a heater for defrosting the evaporator is housed.
  • the heater is designed as a pipe heater and mounted on a support, which also forms walls of the evaporator chamber. A gap between the bottom of the evaporator and the carrier facilitates convection of air heated by the heater through the spaces between adjacent fins.
  • WO03 / 099487 A1 discloses an evaporator for a refrigerator having a plurality of fins crossed by both a refrigerant tube and a tubular heater. Since the cross-sections of the tubular heater and receiving them of recesses of the slats can not match exactly, it comes at those portions of the heating, which intersect the slats, possibly to a point-like contact between the heater and fins, and those sections of the heating, between two blades extend, have no contact. The heat of the heating is therefore at most given off to a small extent directly to the slats.
  • WO03 / 099487A1 discloses an evaporator assembly according to the preamble of claim 1.
  • the object of the invention is to provide an evaporator assembly for a refrigeration device, which allows fast defrosting even at low temperature gradient between heating, refrigerant pipe and fins.
  • Such a portion of the heater contacting the fins extends in the direction of airflow circulating through a housing of the evaporator assembly from an inlet to an outlet opening.
  • the heater is fixed in sections on a support plate and that in a space between two adjacent slats extending portions of the heater are slidable on the surface of the support plate in order to Assembling the heater and the slats to adapt to the staggering of the slats.
  • the heater To enable such displacement of the section of the heater extending between the louvers, it is expedient for the heater to have arcuate sections which connect the sections extending between the louvers and are fastened to the carrier plate.
  • the attachment of the heater to the support plate can be done with the help of notched from the support plate fingers, which preferably engage the arcuate portions.
  • the at least one section of the heater extending between two lamellae preferably has at least one exposed area which projects from the edge into the intermediate space between the lamellae. Such an exposed area helps to facilitate the placement of the portion of the heater between the slats, as a resistance to be overcome when inserting the issued area between two slats is substantially smaller than if the entire section at all times at one time between the slats must be inserted.
  • the refrigerant pipe is preferably arranged crossing the blades to fix the distance of the slats from each other and to give the evaporator the required structural stability.
  • the exposed area engages between two adjacent pipe sections of the refrigerant pipe, it contributes to a reproducible placement of the heater on the evaporator block in the longitudinal direction of the slats or the sections of the heating extending between them.
  • the two juxtaposed pipe sections lie in a same plane adjacent to the edge of the gap and are connected in series via a third pipe section which is farther than the plane away from the edge of the gap.
  • a tip of the issued area can touch the third pipe section to heat this directly.
  • Fig. 1 shows a perspective view of a heater 1 for defrosting an evaporator in a no-frost household refrigerator.
  • the heater 1 comprises a continuous tube formed in meanders having a plurality of substantially parallel tubular sections 2 substantially parallel to each other and sheets 3 connecting them to fill a rectangular area substantially uniformly.
  • the tube may be hollow to circulate a heat transfer fluid therein, but it may also function as a protective sheath for an internal electrical heating conductor.
  • the arcs 3 and the majority of all pipe sections 2 are in the same plane.
  • a flared area 4 is formed, which reaches upwards perpendicular to said plane.
  • Fig. 2 shows the heating of the Fig. 1 mounted on a support plate 5.
  • the support plate 5 is a substantially rectangular blank made of sheet metal, which is stiffened by angled edge strips 6 at two edges. From the support plate 5 adjacent to its two other edges two rows of fingers 7 are unlatched, each embrace the sheets 3 of the heater 1.
  • the pipe sections 2 extend on the support plate 5 substantially free, parallel to the edge strips 6.
  • the fingers 7 fix the heater 1 substantially only in the direction perpendicular to the support plate 5 direction and in the longitudinal direction of the pipe sections 2. Parallel to the support plate 5 and perpendicular to the Pipe sections 2 remains a small freedom of movement.
  • Fig. 3 shows in a side view, the support plate 5 with the heater 1 and an evaporator mounted on it 8.
  • the evaporator 8 includes a refrigerant tube 9, which, coming from an inlet port 10, enters the evaporator 8 at the viewer facing end face and there first a in a first, the heater 1 near adjacent plane 11 parallel to the support plate 5 and the viewing direction of the viewer extending rectilinear pipe section 12 has.
  • At this includes an arc 13 on the side facing away from the viewer side of the evaporator 8 to the viewer back extending pipe section 14 in a parallel to the plane 11, further than this from the heater 1 remote level 15 at.
  • the bow 13 is visible through an oblique slot 16 of an evaporator blade.
  • the slot allows the mounting of the evaporator blade 16 to the refrigerant pipe 9 by sliding the Slat 16 on the bow 13 of its side facing away from the viewer side.
  • the lamella 16 and others, in the view of Fig. 3 from her hidden fins are attached to the pipe sections 12, 14 at a uniform distance, for example by soldering.
  • the pipe section 14 is connected to a further pipe section 12 of the plane 11.
  • pipe sections 12 in the plane 11 and pipe sections 14 in the plane 15 alternate along the refrigerant pipe in a zigzag-shaped arrangement in the side view.
  • another pair of planes 18, 19 are present, in which further rectilinear pipe sections follow each other up to an outlet port 20.
  • the number of pairs of levels can also be one or more than two.
  • the issued area 4 of the heater 1 has a rounded tip 21 which engages between two pipe sections 12 of the lowest level.
  • the diameter of the pipe sections 2 corresponds to the distance between two of the pipe sections 12, 14 fixed in large numbers and at regular intervals evaporator fins 16, and the distance between two pipe sections 2 substantially corresponds to an integer multiple of this distance, so that all the tips 21 of Heater 1, when the evaporator block 8 is placed on the heater 1, meet at a gap between two fins 16. Minor deviations between the distance between the pipe sections 2 and the spacing of the lamellae 16 are equalized by an elastic displacement of the pipe sections 2 when placing the evaporator block 8 on the heater 1 automatically.
  • Fig. 4 In the configuration of Fig. 4 are the lower edges of the evaporator blades 16 in abutment against the support plate 5, and the pipe sections 2 (possibly excluded such on the edge of the support plate 5) are all clamped on their entire length between fins 16.
  • Randel notches 22 on the lower edge of the slats are only visible to a small extent behind the pipe sections 2 of the heater 1.
  • Curved portions 23 of the exposed areas 4 nestle against adjacent pipe sections 12 of the plane 11 and thus define the position of the evaporator block 8 relative to the heater 1 in the longitudinal direction of the pipe sections 2 exactly.
  • Fig. 5 illustrates the structure of the evaporator assembly again in a perspective view, with a majority of the fins 16 of the evaporator 8 is only partially shown in each case to make the exposed areas 4 of the heater 1 visible. In fact, all fins 16 extend as in FIG Fig. 5 Interspaces 31 between adjacent fins 16 each have a width corresponding to the diameter of the pipe sections 2, and between two interstices 31 which receive a pipe section 2 there is one or more interspaces 31, which contain no pipe section 2.
  • the evaporator assembly is the Fig. 5 well suited for use in a no-frost refrigerator, in which an evaporator chamber accommodating the evaporator assembly is housed, for example, in a manner known per se, flat beneath the ceiling of a body of the appliance or in a horizontal intermediate wall between two storage chambers.
  • Fig. 6 shows as a schematic example the attachment of the evaporator assembly in an evaporator chamber 24 between the storage chamber 25 and cover 26 of a refrigerator body.
  • a fan 27 drives the air circulation between inlet and outlet opening 28, 29 of the storage chamber 25 at.
  • the air flow in the interior of the storage chamber runs parallel to the slats 16 and parallel to the support plate of the heater 1, so that the pipe sections 2, although they completely fill gaps between the slats 16, do not hinder the air circulation.
  • the evaporator assembly is mounted in a slightly downward sloping orientation, so that during defrosting condensation water flows to the rear wall 32 of the body out and there can be derived to a known evaporator.
  • the exposed area 4 could prevent thawing water from draining in a portion 30 of the interspace adjacent the exposed area 4.
  • this prevents the notches 22 at the bottom of the fins 16, because through them water can change from the area 30 in an adjacent space between fins 16 in which there is no pipe section 2 and in which the water consequently free on the support plate. 5 can drain down to its lower edge.

Description

Die vorliegende Erfindung betrifft eine Verdampferbaugruppe für ein Kältegerät, insbesondere ein Haushaltskältegerät.The present invention relates to an evaporator assembly for a refrigeration device, in particular a household refrigerator.

Bei Kältegräten in No-Frost-Bauweise ist eine Verdampferbaugruppe in einer an einer Lagerkammer abgetrennten Verdampferkammer untergebracht, und die Lagerkammer wird durch Luftaustausch mit der Verdampferkammer gekühlt. Dabei schlägt sich Luftfeuchtigkeit aus der Lagerkammer in der Verdampferkammer als Reif nieder und bildet im Laufe der Zeit auf dem Verdampfer eine Eisschicht, die den Wärmeaustausch behindert. Wenn der Luftaustausch zwischen Lager- und Verdampferkammer unterbrochen wird, besteht die Möglichkeit, die Eisschicht abzutauen, ohne gleichzeitig die Lagerkammer stark zu erwärmen.In cold-frosted no-frost build-up structures, an evaporator assembly is housed in an evaporator chamber separated from a storage chamber, and the storage chamber is cooled by exchange of air with the evaporator chamber. In this case, humidity from the storage chamber in the evaporator chamber precipitates as a frost and forms over time on the evaporator a layer of ice, which hinders the heat exchange. If the exchange of air between the storage and evaporator chamber is interrupted, it is possible to defrost the ice layer, without at the same time to heat the storage chamber strong.

Aus DE 20 2005 014 373 A1 ist ein No-Frost-Kältegerät bekannt, bei dem in einer Verdampferkammer zum einen ein Verdampfer mit einem Kältemittelrohr und einer Mehrzahl von in thermischen Kontakt mit dem Kältemittelrohr stehenden Lamellen und zum anderen eine Heizung zum Abtauen des Verdampfers untergebracht ist. Die Heizung ist als Rohrheizung ausgebildet und auf einem Träger montiert, der gleichzeitig Wände der Verdampferkammer bildet. Ein Spalt zwischen der Unterseite des Verdampfers und dem Träger erleichtert die Konvektion von an der Heizung erwärmter Luft durch die Zwischenräume zwischen benachbarten Lamellen hindurch.Out DE 20 2005 014 373 A1 is a no-frost refrigeration device is known in which in an evaporator chamber on the one hand, an evaporator with a refrigerant pipe and a plurality of standing in thermal contact with the refrigerant pipe fins and the other a heater for defrosting the evaporator is housed. The heater is designed as a pipe heater and mounted on a support, which also forms walls of the evaporator chamber. A gap between the bottom of the evaporator and the carrier facilitates convection of air heated by the heater through the spaces between adjacent fins.

Um die Erwärmung der Lagerkammer beim Abtauen zu minimieren, ist es wünschenswert, einerseits die zum Abtauen benötigte Zeit bzw. die Zeit, in der die Verdampferkammer wärmer als die Lagerkammer ist und Wärme durch Wände hindurch von der Verdampferkammer in die Lagerkammer fließen kann, zu minimieren. Andererseits macht eine verkürzte Abtauzeit stärkere Temperaturgradienten zwischen Heizung und Verdampfer erforderlich, um die Wärme der Heizung schnell genug auf den Verdampfer zu übertragen. Ein hoher Temperaturgradient führt jedoch auch wieder zu erhöhtem Wärmeabfluss in die Lagerkammer.In order to minimize the heating of the storage chamber during defrosting, it is desirable on the one hand to minimize the time required for defrosting or the time in which the evaporator chamber is warmer than the storage chamber and heat can flow through walls from the evaporator chamber into the storage chamber , On the other hand, a shortened defrost time requires higher temperature gradients between the heater and the evaporator to transfer the heat from the heater to the evaporator quickly enough. However, a high temperature gradient leads again to increased heat dissipation in the storage chamber.

WO03/099487 A1 offenbart einen Verdampfer für ein Kältegerät mit einer Mehrzahl von Lamellen, die sowohl von einem Kältemittelrohr als auch von einer rohrförmigen Heizung gekreuzt werden. Da die Querschnitte der rohrförmigen Heizung und von sie aufnehmenden Aussparungen der Lamellen nicht exakt übereinstimmen können, kommt es an denjenigen Abschnitten der Heizung, die die Lamellen kreuzen, allenfalls zu einem punktförmigen Kontakt zwischen Heizung und Lamellen, und diejenigen Abschnitte der Heizung, die sich zwischen zwei Lamellen erstrecken, haben keinerlei Kontakt. Die Wärme der Heizung wird daher allenfalls zu einem kleinen Teil direkt an die Lamellen abgegeben. WO03 / 099487 A1 discloses an evaporator for a refrigerator having a plurality of fins crossed by both a refrigerant tube and a tubular heater. Since the cross-sections of the tubular heater and receiving them of recesses of the slats can not match exactly, it comes at those portions of the heating, which intersect the slats, possibly to a point-like contact between the heater and fins, and those sections of the heating, between two blades extend, have no contact. The heat of the heating is therefore at most given off to a small extent directly to the slats.

WO03/099487A1 offenbart eine Verdampferbaugruppe gemäß dem Oberbegriff des Anspruchs 1. WO03 / 099487A1 discloses an evaporator assembly according to the preamble of claim 1.

Aufgabe der Erfindung ist, eine Verdampferbaugruppe für ein Kältegerät zu schaffen, die ein schnelles Abtauen auch bei geringem Temperaturgradient zwischen Heizung, Kältemittelrohr und Lamellen ermöglicht.The object of the invention is to provide an evaporator assembly for a refrigeration device, which allows fast defrosting even at low temperature gradient between heating, refrigerant pipe and fins.

Die Aufgabe wird gelöst durch eine Verdampferbaugruppe mit den Merkmalen des Anspruchs 1.The object is achieved by an evaporator assembly having the features of claim 1.

Ein solcher die Lamellen berührender Abschnitt der Heizung erstreckt sich in Richtung einer Luftströmung, die durch ein Gehäuse der Verdampferbaugruppe von einer Einlass- zu einer Auslassöffnung zirkuliert.Such a portion of the heater contacting the fins extends in the direction of airflow circulating through a housing of the evaporator assembly from an inlet to an outlet opening.

Für die Vereinfachung des Zusammenbaus ist es ferner zweckmäßig, dass die Heizung abschnittsweise auf einer Trägerplatte befestigt ist und dass die sich in einem Zwischenraum zwischen zwei benachbarten Lamellen erstreckenden Abschnitte der Heizung auf der Oberfläche der Trägerplatte verschiebbar sind, um sich beim Zusammenfügen der Heizung und der Lamellen an die Staffelung der Lamellen anpassen zu können.To simplify the assembly, it is also expedient that the heater is fixed in sections on a support plate and that in a space between two adjacent slats extending portions of the heater are slidable on the surface of the support plate in order to Assembling the heater and the slats to adapt to the staggering of the slats.

Um eine solche Verschiebung der sich zwischen den Lamellen erstreckenden Abschnitt der Heizung zu ermöglichen, ist es zweckmäßig, wenn die Heizung bogenförmige Abschnitte aufweist, die die sich zwischen den Lamellen erstreckenden Abschnitte miteinander verbinden und an der Trägerplatte befestigt sind.To enable such displacement of the section of the heater extending between the louvers, it is expedient for the heater to have arcuate sections which connect the sections extending between the louvers and are fastened to the carrier plate.

Die Befestigung der Heizung an der Trägerplatte kann mit Hilfe von aus der Trägerplatte ausgeklinkten Fingern erfolgen, die vorzugsweise an den bogenförmigen Abschnitten angreifen.The attachment of the heater to the support plate can be done with the help of notched from the support plate fingers, which preferably engage the arcuate portions.

Der wenigstens eine sich zwischen zwei Lamellen erstreckende Abschnitt der Heizung weist vorzugsweise wenigstens einen ausgestellten Bereich auf, der vom Rand aus in den Zwischenraum zwischen den Lamellen hineinragt. Ein solcher ausgestellter Bereich trägt dazu bei, die Platzierung des Abschnitts der Heizung zwischen den Lamellen zu erleichtern, da ein beim Einführen des ausgestellten Bereichs zwischen zwei Lamellen eventuell zu überwindender Widerstand wesentlich kleiner ist, als wenn der gesamte Abschnitt auf seiner gesamten Länge auf einmal zwischen die Lamellen eingeführt werden muss.The at least one section of the heater extending between two lamellae preferably has at least one exposed area which projects from the edge into the intermediate space between the lamellae. Such an exposed area helps to facilitate the placement of the portion of the heater between the slats, as a resistance to be overcome when inserting the issued area between two slats is substantially smaller than if the entire section at all times at one time between the slats must be inserted.

Das Kältemittelrohr ist vorzugweise die Lamellen kreuzend angeordnet, um den Abstand der Lamellen voneinander zu fixieren und dem Verdampfer die erforderliche strukturelle Stabilität zu geben.The refrigerant pipe is preferably arranged crossing the blades to fix the distance of the slats from each other and to give the evaporator the required structural stability.

Wenn der ausgestellte Bereich zwischen zwei nebeneinander herlaufende Rohrabschnitte des Kältemittelrohrs eingreift, trägt er zu einer reproduzierbaren Platzierung der Heizung am Verdampferblock in Längsrichtung der Lamellen bzw. der zwischen ihnen verlaufenden Abschnitte der Heizung bei.When the exposed area engages between two adjacent pipe sections of the refrigerant pipe, it contributes to a reproducible placement of the heater on the evaporator block in the longitudinal direction of the slats or the sections of the heating extending between them.

Wenn der ausgestellte Bereich die nebeneinander herlaufenden Rohrabschnitte berührt, so unterstützt dies auch noch die Wärmeübertragung von der Heizung auf die Rohrabschnitte.If the issued area touches the pipe sections running side by side, this also supports the heat transfer from the heater to the pipe sections.

Vorzugsweise liegen die zwei nebeneinander herlaufenden Rohrabschnitte in einer gleichen zum Rand des Zwischenraums benachbarten Ebene und sind über einen dritten Rohrabschnitt in Reihe verbunden, der weiter als die Ebene vom Rand des Zwischenraums entfernt ist. So ist es möglich, den ausgestellten Bereich trotz geringer Krümmung tief in den Verdampfer eingreifen zu lassen und die Position der Heizung relativ zum Verdampfer sicher festzulegen.Preferably, the two juxtaposed pipe sections lie in a same plane adjacent to the edge of the gap and are connected in series via a third pipe section which is farther than the plane away from the edge of the gap. Thus, it is possible to allow the issued area deep into the evaporator despite low curvature and to set the position of the heater relative to the evaporator safely.

Eine Spitze des ausgestellten Bereichs kann den dritten Rohrabschnitt berühren, um auch diesen direkt zu erwärmen.A tip of the issued area can touch the third pipe section to heat this directly.

Weitere Merkmale und Vorteile der Erfindung werden deutlich anhand der nachfolgenden Beschreibung von Ausführungsbeispielen unter Bezugnahme auf die beigefügten Figuren. Aus dieser Beschreibung und den Figuren gehen auch Merkmale derFurther features and advantages of the invention will become apparent from the following description of embodiments with reference to the accompanying figures. From this description and the figures are also features of the

Ausführungsbeispiele hervor, die nicht in den Ansprüchen erwähnt sind. Solche Merkmale können auch in anderen als den hier spezifisch offenbarten Kombinationen auftreten. Die Tatsache, dass mehrere solche Merkmale in einem gleichen Satz oder in einer anderen Art von Textzusammenhang miteinander erwähnt sind, rechtfertigt daher nicht den Schluss, dass sie nur in der spezifisch offenbarten Kombination auftreten können; stattdessen ist grundsätzlich davon auszugehen, dass von mehreren solchen Merkmalen auch einzelne weggelassen oder abgewandelt werden können, sofern dies die Funktionsfähigkeit der Erfindung nicht in Frage stellt. Es zeigen:

Fig. 1
eine perspektivische Ansicht einer Rohrheizung zur Verwendung in der erfindungsgemäßen Verdampferbaugruppe;
Fig. 2
die auf einem Trägerblech montierte Rohrheizung aus Fig. 1;
Fig. 3
eine Seitenansicht der Rohrheizung und eines Verdampfers vor dem Zusammenfügen;
Fig. 4
die Rohrheizung und den Verdampfer nach dem Zusammenfügen;
Fig. 5
eine perspektivische Ansicht des Verdampfers und der Rohrheizung; und
Fig. 6
die Anbringung der Verdampferbaugruppe in einem Kältegerät.
Embodiments, which are not mentioned in the claims. Such features may also occur in combinations other than those specifically disclosed herein. Therefore, the fact that several such features are mentioned in the same sentence or in a different type of textual context does not justify the conclusion that they can occur only in the specific combination disclosed; instead, it is generally to be assumed that it is also possible to omit or modify individual ones of several such features, provided this does not call into question the functionality of the invention. Show it:
Fig. 1
a perspective view of a pipe heater for use in the evaporator assembly according to the invention;
Fig. 2
the mounted on a support plate pipe heater Fig. 1 ;
Fig. 3
a side view of the pipe heater and an evaporator before assembly;
Fig. 4
the pipe heater and the evaporator after assembly;
Fig. 5
a perspective view of the evaporator and the pipe heater; and
Fig. 6
the installation of the evaporator assembly in a refrigeration device.

Fig. 1 zeigt eine perspektivische Ansicht einer Heizung 1 zum Abtauen eines Verdampfers in einem No-Frost-Haushaltskältegerät. Die Heizung 1 umfasst ein kontinuierliches Rohr, das in Mäandern mit einer Vielzahl von zueinander parallelen, im Wesentlichen geradlinigen Rohrabschnitten 2 und diese verbindenden Bögen 3 geformt ist, um eine rechteckige Fläche im Wesentlichen gleichmäßig auszufüllen. Das Rohr kann hohl sein, um darin ein Wärmeträgerfluid zirkulieren zu lassen, es kann aber auch als Schutzhülle für einen in seinem Inneren verlaufenden elektrischen Heizleiter fungieren. Die Bögen 3 und der überwiegende Teil aller Rohrabschnitte 2 liegen in einer gleichen Ebene. In der Mitte jedes Rohrabschnitts 2 ist jeweils ein ausgestellter Bereich 4 gebildet, der senkrecht zu besagter Ebene nach oben ausgreift. Fig. 1 shows a perspective view of a heater 1 for defrosting an evaporator in a no-frost household refrigerator. The heater 1 comprises a continuous tube formed in meanders having a plurality of substantially parallel tubular sections 2 substantially parallel to each other and sheets 3 connecting them to fill a rectangular area substantially uniformly. The tube may be hollow to circulate a heat transfer fluid therein, but it may also function as a protective sheath for an internal electrical heating conductor. The arcs 3 and the majority of all pipe sections 2 are in the same plane. In the middle of each tube section 2, a flared area 4 is formed, which reaches upwards perpendicular to said plane.

Fig. 2 zeigt die Heizung der Fig. 1, montiert auf einer Trägerplatte 5. Die Trägerplatte 5 ist ein im Wesentlichen rechteckiger Zuschnitt aus Blech, der durch abgewinkelte Randstreifen 6 an zwei Rändern versteift ist. Aus der Trägerplatte 5 sind benachbart zu ihren zwei anderen Rändern zwei Reihen von Fingern 7 ausgeklinkt, die jeweils die Bögen 3 der Heizung 1 umgreifen. Die Rohrabschnitte 2 erstrecken sich auf der Trägerplatte 5 im Wesentlichen frei, parallel zu den Randstreifen 6. Die Finger 7 fixieren die Heizung 1 im Wesentlichen nur in zur Trägerplatte 5 senkrechter Richtung sowie in Längsrichtung der Rohrabschnitte 2. Parallel zur Trägerplatte 5 und senkrecht zu den Rohrabschnitten 2 bleibt eine geringe Bewegungsfreiheit bestehen. Fig. 2 shows the heating of the Fig. 1 mounted on a support plate 5. The support plate 5 is a substantially rectangular blank made of sheet metal, which is stiffened by angled edge strips 6 at two edges. From the support plate 5 adjacent to its two other edges two rows of fingers 7 are unlatched, each embrace the sheets 3 of the heater 1. The pipe sections 2 extend on the support plate 5 substantially free, parallel to the edge strips 6. The fingers 7 fix the heater 1 substantially only in the direction perpendicular to the support plate 5 direction and in the longitudinal direction of the pipe sections 2. Parallel to the support plate 5 and perpendicular to the Pipe sections 2 remains a small freedom of movement.

Fig. 3 zeigt in einer Seitenansicht die Trägerplatte 5 mit der Heizung 1 und einen darauf zu montierenden Verdampfer 8. Der Verdampfer 8 umfasst ein Kältemittelrohr 9, das, von einem Einlassanschluss 10 kommend, in den Verdampfer 8 an dessen dem Betrachter zugewandter Stirnseite eintritt und dort zunächst einen in einer ersten, der Heizung 1 nahe benachbarten Ebene 11 parallel zur Trägerplatte 5 und zur Blickrichtung des Betrachters verlaufenden geradlinigen Rohrabschnitt 12 aufweist. An diesen schließt über einen Bogen 13 an der vom Betrachter abgewandten Seite des Verdampfers 8 ein zum Betrachter zurück verlaufender Rohrabschnitt 14 in einer zur Ebene 11 parallelen, weiter als diese von der Heizung 1 entfernten Ebene 15 an. Der Bogen 13 ist durch einen schrägen Schlitz einer Verdampferlamelle 16 hindurch sichtbar. Der Schlitz ermöglicht die Montage der Verdampferlamelle 16 an dem Kältemittelrohr 9 durch Aufschieben der Lamelle 16 auf den Bogen 13 von dessen vom Betrachter abgewandter Seite her. Die Lamelle 16 und weitere, in der Ansicht der Fig. 3 von ihr verdeckte Lamellen sind an den Rohrabschnitten 12, 14 in gleichmäßigem Abstand z.B. durch Lötung befestigt. Über einen Bogen 17, der über die Lamelle 16 zum Betrachter hin vorspringt, ist der Rohrabschnitt 14 mit einem weiteren Rohrabschnitt 12 der Ebene 11 verbunden. Es wechseln sich somit entlang des Kältemittelrohrs in einer in der Seitenansicht zickzackförmigen Anordnung Rohrabschnitte 12 in der Ebene 11 und Rohrabschnitte 14 in der Ebene 15 ab. Fig. 3 shows in a side view, the support plate 5 with the heater 1 and an evaporator mounted on it 8. The evaporator 8 includes a refrigerant tube 9, which, coming from an inlet port 10, enters the evaporator 8 at the viewer facing end face and there first a in a first, the heater 1 near adjacent plane 11 parallel to the support plate 5 and the viewing direction of the viewer extending rectilinear pipe section 12 has. At this includes an arc 13 on the side facing away from the viewer side of the evaporator 8 to the viewer back extending pipe section 14 in a parallel to the plane 11, further than this from the heater 1 remote level 15 at. The bow 13 is visible through an oblique slot 16 of an evaporator blade. The slot allows the mounting of the evaporator blade 16 to the refrigerant pipe 9 by sliding the Slat 16 on the bow 13 of its side facing away from the viewer side. The lamella 16 and others, in the view of Fig. 3 from her hidden fins are attached to the pipe sections 12, 14 at a uniform distance, for example by soldering. About an arc 17 which projects beyond the blade 16 to the viewer, the pipe section 14 is connected to a further pipe section 12 of the plane 11. Thus, pipe sections 12 in the plane 11 and pipe sections 14 in the plane 15 alternate along the refrigerant pipe in a zigzag-shaped arrangement in the side view.

Bei dem hier gezeigten Beispiel ist ein weiteres Paar von Ebenen18, 19 vorhanden, in denen weitere geradlinige Rohrabschnitte bis zu einem Auslassanschluss 20 aufeinander folgen. Die Zahl der Paare von Ebenen kann auch eins oder größer als zwei sein.In the example shown here, another pair of planes 18, 19 are present, in which further rectilinear pipe sections follow each other up to an outlet port 20. The number of pairs of levels can also be one or more than two.

Der ausgestellte Bereich 4 der Heizung 1 weist eine abgerundete Spitze 21 auf, die zwischen zwei Rohrabschnitte 12 der untersten Ebene eingreift. Der Durchmesser der Rohrabschnitte 2 entspricht dem Abstand zwischen zwei der an den Rohrabschnitten 12, 14 in großer Zahl und in gleichmäßigen Abständen befestigten Verdampferlamellen 16, und der Abstand zwischen zwei Rohrabschnitten 2 entspricht im Wesentlichen einem ganzzahligen Vielfachen dieses Abstands, so dass sämtliche Spitzen 21 der Heizung 1, wenn der Verdampferblock 8 auf der Heizung 1 platziert wird, auf einen Zwischenraum zwischen zwei Lamellen 16 treffen. Geringfügige Abweichungen zwischen dem Abstand der Rohrabschnitte 2 und dem Abstand der Lamellen 16 voneinander gleichen sich durch eine elastische Verschiebung der Rohrabschnitte 2 beim Aufsetzen des Verdampferblocks 8 auf die Heizung 1 selbsttätig aus.The issued area 4 of the heater 1 has a rounded tip 21 which engages between two pipe sections 12 of the lowest level. The diameter of the pipe sections 2 corresponds to the distance between two of the pipe sections 12, 14 fixed in large numbers and at regular intervals evaporator fins 16, and the distance between two pipe sections 2 substantially corresponds to an integer multiple of this distance, so that all the tips 21 of Heater 1, when the evaporator block 8 is placed on the heater 1, meet at a gap between two fins 16. Minor deviations between the distance between the pipe sections 2 and the spacing of the lamellae 16 are equalized by an elastic displacement of the pipe sections 2 when placing the evaporator block 8 on the heater 1 automatically.

Da die ausgestellten Bereiche 4 zunächst nur auf geringer Länge zwischen die Lamellen 16 eingreifen, ist die zum Einführen der Bereiche 4 zwischen die Lamelle 16 erforderliche Kraft begrenzt. Wenn diese Einführung gelungen ist, sind die Rohrabschnitte 2 jeweils korrekt in Bezug auf die Zwischenräume zwischen den Lamellen 16 positioniert, so dass der Verdampfer 8 in der in Fig. 4 gezeigten Weise vollständig auf die Heizung 1 aufgedrückt werden kann.Since the exposed areas 4 initially only intervene on a short length between the slats 16, the force required to insert the areas 4 between the slats 16 is limited. If this introduction has been successful, the pipe sections 2 are each correctly positioned with respect to the spaces between the fins 16, so that the evaporator 8 in the in Fig. 4 shown manner can be completely pushed onto the heater 1.

In der Konfiguration der Fig. 4 befinden sich die unteren Ränder der Verdampferlamellen 16 im Anschlag an der Trägerplatte 5, und die Rohrabschnitte 2 (eventuell ausgenommen solche am Rand der Trägerplatte 5) sind sämtlich auf ihrer gesamten Länge zwischen Lamellen 16 geklemmt. Randoffene Kerben 22 an der Unterkante der Lamellen sind nur zu einem kleinen Teil hinter den Rohrabschnitten 2 der Heizung 1 noch sichtbar. Gekrümmte Abschnitte 23 der ausgestellten Bereiche 4 schmiegen sich an benachbarte Rohrabschnitte 12 der Ebene 11 und legen so die Position des Verdampferblocks 8 relativ zur Heizung 1 auch in Längsrichtung der Rohrabschnitte 2 exakt fest.In the configuration of Fig. 4 are the lower edges of the evaporator blades 16 in abutment against the support plate 5, and the pipe sections 2 (possibly excluded such on the edge of the support plate 5) are all clamped on their entire length between fins 16. Randel notches 22 on the lower edge of the slats are only visible to a small extent behind the pipe sections 2 of the heater 1. Curved portions 23 of the exposed areas 4 nestle against adjacent pipe sections 12 of the plane 11 and thus define the position of the evaporator block 8 relative to the heater 1 in the longitudinal direction of the pipe sections 2 exactly.

Fig. 5 veranschaulicht den Aufbau der Verdampferbaugruppe noch einmal in einer perspektivischen Ansicht, wobei ein Großteil der Lamellen 16 des Verdampfers 8 jeweils nur partiell dargestellt ist, um die ausgestellten Bereiche 4 der Heizung 1 sichtbar zu lassen. Tatsächlich erstrecken sich sämtliche Lamellen 16, wie in Fig. 5 nur für die jeweils stirnseitigen dargestellt, über die gesamte Breite des Verdampferblocks 8. Zwischenräume 31 zwischen benachbarten Lamellen 16 haben jeweils eine dem Durchmesser der Rohrabschnitte 2 entsprechende Breite, und zwischen zwei Zwischenräumen 31, die einen Rohrabschnitt 2 aufnehmen, gibt es einen oder mehrere Zwischenräume 31, die keinen Rohrabschnitt 2 enthalten. Fig. 5 illustrates the structure of the evaporator assembly again in a perspective view, with a majority of the fins 16 of the evaporator 8 is only partially shown in each case to make the exposed areas 4 of the heater 1 visible. In fact, all fins 16 extend as in FIG Fig. 5 Interspaces 31 between adjacent fins 16 each have a width corresponding to the diameter of the pipe sections 2, and between two interstices 31 which receive a pipe section 2 there is one or more interspaces 31, which contain no pipe section 2.

Aufgrund ihrer flachen Bauform ist die Verdampferbaugruppe der Fig. 5 gut geeignet zur Verwendung in einem No-Frost-Kältegerät, bei dem eine die Verdampferbaugruppe aufnehmende Verdampferkammer z.B. in an sich bekannter Weise flach unter deren Decke eines Korpus des Gerätes oder in einer horizontalen Zwischenwand zwischen zwei Lagerkammer untergebracht ist.Due to its flat design, the evaporator assembly is the Fig. 5 well suited for use in a no-frost refrigerator, in which an evaporator chamber accommodating the evaporator assembly is housed, for example, in a manner known per se, flat beneath the ceiling of a body of the appliance or in a horizontal intermediate wall between two storage chambers.

Fig. 6 zeigt als schematisches Beispiel die Anbringung der Verdampferbaugruppe in einer Verdampferkammer 24 zwischen Lagerkammer 25 und Decke 26 eines Kältegerätekorpus. Ein Ventilator 27 treibt die Luftzirkulation zwischen Ein- und Auslassöffnung 28, 29 der Lagerkammer 25 an. Der Luftstrom im Innern der Lagerkammer verläuft parallel zu den Lamellen 16 und parallel zur Trägerplatte der Heizung 1, so dass die Rohrabschnitte 2, obwohl sie Zwischenräume zwischen den Lamellen 16 vollständig ausfüllen, die Luftzirkulation nicht behindern. Fig. 6 shows as a schematic example the attachment of the evaporator assembly in an evaporator chamber 24 between the storage chamber 25 and cover 26 of a refrigerator body. A fan 27 drives the air circulation between inlet and outlet opening 28, 29 of the storage chamber 25 at. The air flow in the interior of the storage chamber runs parallel to the slats 16 and parallel to the support plate of the heater 1, so that the pipe sections 2, although they completely fill gaps between the slats 16, do not hinder the air circulation.

Die Verdampferbaugruppe ist in einer leicht nach hinten abschüssigen Orientierung montiert, damit beim Abtauen Tauwasser zur Rückwand 32 des Korpus hin abfließt und dort zu einem an sich bekannten Verdunster abgeleitet werden kann. Anhand der Darstellung der Fig. 6 ist leicht nachvollziehbar, dass, wenn ein Rohrabschnitt 2 den Zwischenraum zwischen zwei Lamellen 16 nach unten vollständig versperrt, der ausgestellte Bereich 4 Tauwasser in einem an dem ausgestellten Bereich 4 angrenzenden Bereich 30 des Zwischenraums am Abfließen hindern könnte. Dies verhindern jedoch die Kerben 22 am unteren Rand der Lamellen 16, denn durch sie hindurch kann Wasser aus dem Bereich 30 in einen benachbarten Zwischenraum zwischen Lamellen 16 wechseln, in dem sich kein Rohrabschnitt 2 befindet und in dem das Wasser folglich frei auf der Trägerplatte 5 bis zu deren unterem Rand hin abfließen kann.The evaporator assembly is mounted in a slightly downward sloping orientation, so that during defrosting condensation water flows to the rear wall 32 of the body out and there can be derived to a known evaporator. Based on presentation of the Fig. 6 It will be readily understood that if a pipe section 2 completely obstructs the space between two louvers 16 downwardly, the exposed area 4 could prevent thawing water from draining in a portion 30 of the interspace adjacent the exposed area 4. However, this prevents the notches 22 at the bottom of the fins 16, because through them water can change from the area 30 in an adjacent space between fins 16 in which there is no pipe section 2 and in which the water consequently free on the support plate. 5 can drain down to its lower edge.

Claims (10)

  1. Evaporator assembly for a refrigerator, in particular a domestic refrigerator, having a housing, an evaporator (8) comprising a refrigerant pipe (9) and a plurality of discs (16) in thermal contact with the refrigerant pipe (9) and a pipe-type heater (1) for defrosting the evaporator (8), which is arranged in contact with the discs (16) at least in sections (2), wherein the evaporator (8) is surrounded by the housing with an inlet and an outlet opening (28; 29), which define an airflow direction through the evaporator (8), characterised in that at least one section (2) of the heater (1), which extends in an intermediate space (31) between two adjacent discs (16), is oriented in the airflow direction, touches both discs (16) delimiting the intermediate space (31) and extends at least for the most part along an edge of the intermediate space (31).
  2. Evaporator assembly according to claim 1, characterised in that the heater (1) is fastened in sections to a support plate (5) and that the sections (2) of the heater (1) which extend in an intermediate space (31) between two adjacent discs (16) can be moved on the support plate (5).
  3. Evaporator assembly according to claim 2, characterised in that the heater (1) has arched sections (3), which connect the sections (2) which extend in an intermediate space (31) between two adjacent discs (16) with one another and which are fastened to the support plate (5).
  4. Evaporator assembly according to claim 2 or 3, characterised in that the heater (1) is held on the support plate (5) by way of fingers (7) raised out of the support plate (5).
  5. Evaporator assembly according to one of claims 1 to 4, characterised in that the section (2) has at least one exposed region (4), which protrudes from the edge into the intermediate space (31).
  6. Evaporator assembly according to one of the preceding claims, characterised in that the refrigerant pipe (9) is arranged to intersect the discs (16).
  7. Evaporator assembly according to claim 6, when appendant to claim 5, characterised in that the exposed region (4) engages between two pipe sections (12) of the refrigerant pipe (9) which run in parallel to one another.
  8. Evaporator assembly according to claim 7, characterised in that the exposed region (4) touches the pipe sections (12) which run in parallel to one another.
  9. Evaporator assembly according to claim 7 or 8, characterised in that the two pipe sections (12) which run in parallel to one another lie in an identical plane (11) which is adjacent to the edge of the intermediate space (31) and are connected in series with one another by way of a third pipe section (14), which is distanced further from the edge of the intermediate space (31) than the plane (11).
  10. Evaporator assembly according to claim 9, characterised in that a tip (21) of the exposed region (4) touches the third pipe section (14).
EP12714634.8A 2011-04-06 2012-04-02 Evaporator assembly for a cooling device Active EP2694895B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201110006862 DE102011006862A1 (en) 2011-04-06 2011-04-06 Evaporator assembly for a refrigeration device
PCT/EP2012/055948 WO2012136618A1 (en) 2011-04-06 2012-04-02 Evaporator assembly for a refrigeration appliance

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EP2694895A1 EP2694895A1 (en) 2014-02-12
EP2694895B1 true EP2694895B1 (en) 2017-01-04

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EP (1) EP2694895B1 (en)
CN (1) CN103459952B (en)
DE (1) DE102011006862A1 (en)
PL (1) PL2694895T3 (en)
RU (1) RU2552085C1 (en)
WO (1) WO2012136618A1 (en)

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Publication number Priority date Publication date Assignee Title
CN104896840B (en) * 2015-04-30 2017-07-11 惠而浦（中国）股份有限公司 A kind of direct cooling refrigerator of automatic defrosting
CN105157324A (en) * 2015-09-30 2015-12-16 合肥华凌股份有限公司 Defrosting device and refrigerator provided with same
EP3665426A1 (en) 2017-08-09 2020-06-17 Arçelik Anonim Sirketi Refrigeration appliance with improved defrosting system having double pipe heater
EP4102154B1 (en) * 2021-06-08 2024-01-17 Hauser GmbH Heat exchanger for a refrigerated cabinet

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Publication number Priority date Publication date Assignee Title
US5388427A (en) * 1992-09-23 1995-02-14 Samsung Electronics Co., Ltd. Refrigerator with kimchi compartment
RU2188992C2 (en) * 2000-11-01 2002-09-10 Маханьков Юрий Егорович Cooling device evaporator
TR200402804T2 (en) * 2002-05-29 2005-04-21 Arçeli̇k A.Ş. An evaporator production method
JP2005134030A (en) * 2003-10-30 2005-05-26 Matsushita Electric Ind Co Ltd Refrigerator
DE202005014373U1 (en) 2005-09-12 2006-01-05 BSH Bosch und Siemens Hausgeräte GmbH No-frost refrigerating appliance
ITVE20050033U1 (en) * 2005-10-20 2007-04-21 I R C A S P A Ind Resistenze SHEET EVAPORATOR FOR REFRIGERANT SYSTEMS PROVIDED WITH A DEVICE FOR DEFROSTING.
US9874403B2 (en) * 2009-02-27 2018-01-23 Electrolux Home Products, Inc. Evaporator fins in contact with end bracket

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DE102011006862A1 (en) 2012-10-11
PL2694895T3 (en) 2017-03-31
CN103459952A (en) 2013-12-18
EP2694895A1 (en) 2014-02-12
RU2552085C1 (en) 2015-06-10
CN103459952B (en) 2016-08-10
WO2012136618A1 (en) 2012-10-11
RU2013145294A (en) 2015-05-20

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