EP1880158B1 - Heat exchanger for a refrigerating device - Google Patents

Heat exchanger for a refrigerating device Download PDF

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Publication number
EP1880158B1
EP1880158B1 EP06725516A EP06725516A EP1880158B1 EP 1880158 B1 EP1880158 B1 EP 1880158B1 EP 06725516 A EP06725516 A EP 06725516A EP 06725516 A EP06725516 A EP 06725516A EP 1880158 B1 EP1880158 B1 EP 1880158B1
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EP
European Patent Office
Prior art keywords
housing
heat exchanger
exchanger according
passages
fan
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP06725516A
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German (de)
French (fr)
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EP1880158A1 (en
Inventor
Hans Ihle
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BSH Hausgeraete GmbH
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BSH Bosch und Siemens Hausgeraete GmbH
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Publication of EP1880158A1 publication Critical patent/EP1880158A1/en
Application granted granted Critical
Publication of EP1880158B1 publication Critical patent/EP1880158B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D23/00—General constructional features
    • F25D23/003—General constructional features for cooling refrigerating machinery
    • 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
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B39/00—Evaporators; Condensers
    • F25B39/04—Condensers
    • 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
    • F28D1/0233—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 air flow channels
    • F28D1/024—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 air flow channels with an air driving element
    • 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
    • F28D1/0472—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 helically or spirally coiled
    • 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
    • F25D2323/00—General constructional features not provided for in other groups of this subclass
    • F25D2323/002—Details for cooling refrigerating machinery
    • F25D2323/0021—Details for cooling refrigerating machinery using air guides
    • 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
    • F25D2323/00—General constructional features not provided for in other groups of this subclass
    • F25D2323/002—Details for cooling refrigerating machinery
    • F25D2323/0026—Details for cooling refrigerating machinery characterised by the incoming air flow
    • F25D2323/00266—Details for cooling refrigerating machinery characterised by the incoming air flow through the bottom
    • 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
    • F25D2323/00—General constructional features not provided for in other groups of this subclass
    • F25D2323/002—Details for cooling refrigerating machinery
    • F25D2323/0026—Details for cooling refrigerating machinery characterised by the incoming air flow
    • F25D2323/00267—Details for cooling refrigerating machinery characterised by the incoming air flow through the side
    • 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
    • F25D2323/00—General constructional features not provided for in other groups of this subclass
    • F25D2323/002—Details for cooling refrigerating machinery
    • F25D2323/0027—Details for cooling refrigerating machinery characterised by the out-flowing air
    • F25D2323/00276—Details for cooling refrigerating machinery characterised by the out-flowing air from the bottom
    • 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
    • F25D2323/00—General constructional features not provided for in other groups of this subclass
    • F25D2323/002—Details for cooling refrigerating machinery
    • F25D2323/0027—Details for cooling refrigerating machinery characterised by the out-flowing air
    • F25D2323/00277—Details for cooling refrigerating machinery characterised by the out-flowing air from the side

Definitions

  • the present invention relates to a heat exchanger having an open, tube-like housing and a conduit disposed therein, which serves for guiding a first heat transfer fluid, and which has a developed length which is longer than the length of the housing, which is open at its two Strininstall, to be flowed through by a second heat transfer fluid, and a refrigeration device in which such a heat exchanger is used.
  • a heat exchanger and such a refrigerator are out US 5592829 known.
  • the line is designed as a helix.
  • the housing around the helix forces the flow of the second heat transfer fluid to stroke along the helix along its entire length so as to achieve a high heat exchange capacity with a moderate throughput of the second heat transfer fluid.
  • the US 2311947 shows a heat exchanger according to the preamble of claim 1.
  • An object of the present invention is to improve the efficiency of a heat exchanger of the type specified.
  • these openings permit an inflow or outflow of the second heat transfer fluid.
  • Its flow field in the interior of the housing is therefore not oriented purely in the longitudinal direction, but it also has radial components, so that even from the open end faces of the housing remote line components, such as the turns of a coil or longitudinal sections a meandering or arranged in at least one loop line can be supplied with second heat transfer fluid, which is not preheated at another portion of the coil or the meander (or, depending on the direction of the heat flow in the heat exchanger, pre-cooled).
  • a favorable, all-sided action on the line within the housing with not yet preheated by other power sections air results when advantageously the openings over the circumference of the lateral surface evenly distributed with the same or different opening cross-section are arranged.
  • the proportion of apertures on the surface of the wall decreases with increasing distance from a first end face of the housing.
  • the opening cross-section of the apertures decreases with increasing distance from the first end face.
  • One of the second end side adjacent half of the housing may be free of apertures.
  • the heat exchanger is preferably provided with a blower.
  • This fan is preferably arranged on the second end face of the housing.
  • this second end face is preferably a downstream side, i. the blower sucks the second heat transfer fluid through the housing, and the complete flow of the second refrigerant passes through the opening on the second end face so that it can be diverted therefrom and supplied for further use.
  • the fan may also be arranged centrally in the housing;
  • a portion of the apertures, which decreases toward the fan from both end sides of the housing, can be provided on the surface of the wall, so that second heat carrier fluid flows into the opening through the apertures located upstream from the fan Enter housing and this can leave through the downstream of the fan breakthroughs again.
  • the invention further relates to a refrigeration device having a heat exchanger in the above-mentioned manner as a condenser.
  • the second heat transfer fluid in this case is generally air, while the first heat transfer fluid is a refrigerant of the refrigerator.
  • the in Fig. 1 shown heat exchanger comprises a bent into a helical coil pipe 1 for a first heat transfer fluid, preferably a refrigerant.
  • a housing 2 extends coaxially to the longitudinal axis A of the pipeline 1.
  • the housing 2 is here essentially composed of two rigid frame members 3, 4, which form opposite end faces of the housing 2, and one around the outer edges of the two frame members 3, 4th extending the four side walls of the housing forming sheet 5.
  • the facing the subject frame member 3 has a large-scale inner opening 6; in a corresponding opening 7 of the other Frame member 4 engage radial struts 8, which carry an electric motor 9 coaxial with the coiled tubing 1.
  • the electric motor 9 drives a fan wheel 10 protruding from the housing 2 and thus effects an air flow through the housing 2 from the side of the frame element 3 to that of the frame element 4.
  • Fig. 2 illustrates the flow conditions in the interior of the heat exchanger according to the invention by means of an axial section.
  • a majority of the air conveyed by the fan wheel 10 through the heat exchanger enters the latter through the opening 6. If this were the only air inlet opening, an air stream substantially parallel to the longitudinal axis would result, with part of the air flowing along the pipe 1, while a large part of the air flow will pass through the free interior of the coil, and hardly any Heat from the pipe 1 receives.
  • the windings of the pipeline 1 lying one behind the other in the flow direction in such a case severely brake the air flow, so that a high flow velocity, which makes up a substantial part of the air flow rate of the heat exchanger, is achieved in the empty interior of the coil.
  • the apertures 12 allow an influx of air from the lateral direction, which runs obliquely to the longitudinal axis in the interior of the housing 2, so that even windings of the pipeline 1, which are far away from the inlet opening 6, are still reached by cool fresh air.
  • a modified embodiment of a heat exchanger according to the invention is in Fig. 3 in one too Fig. 2 shown analogue section.
  • the blower formed by the electric motor 9 and the fan wheel 10 is arranged centrally in the heat exchanger, inside the coil formed by the pipe 1.
  • These openings 13 lend the air flow downstream of the fan a radially to outwardly directed velocity component, so that it is also avoided here that a turn of the pipe 1 is in the lee of an adjacent turn and is supplied insufficiently with cooling air.
  • a partition wall 14 which extends from the outer wall of the housing 2 forming sheet 5 in height Fan wheel 10 extends into the immediate vicinity of the helix.
  • Fig. 4 shows as an example of application of the heat exchanger according to the invention a horizontal section through a refrigerator or freezer with a body 20 and a door 21.
  • a machine room niche 22 is recessed in the side by side as condenser 23 for a refrigerant of in Fig. 1 or 2 shown heat exchanger and a compressor 24 are housed.
  • the pipe 1 of the condenser 23 is connected to a high-pressure outlet of the compressor 24.
  • a refrigerant and fresh air driven by the blower pass through the condenser 23 in opposite directions.
  • Fresh air heated in the condenser 23 flows to the compressor 24 and cools this; In addition, it promotes the evaporation of condensate discharged from the interior 25 of the refrigerator in an evaporation tray 26 mounted on the compressor 24.
  • Air inlet and outlet openings 27 and 28 are formed here in lateral walls of the machine room niche 22; alternatively, they could be provided in the bottom thereof to supply and discharge fresh air through a hollow equipment base underlying the body 20, or the back of the engine room niche 22 could be left open in places to allow air exchange.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)

Abstract

The invention relates to a housing that houses a coiled conduit for a first heat transfer fluid with the housing open at two front sides and surrounding the coil. A wall of the housing that extends in the longitudinal direction of the coil is provided with passages.

Description

Die vorliegende Erfindung betrifft einen Wärmetauscher mit einem offenen, rohrähnlichen Gehäuse und einer darin angeordneten Leitung, die zum Führen eines ersten Wärmeträgerfluids dient, und die eine abgewickelte Länge aufweist, die länger als die Länge des Gehäuses ist, das an seinen beiden Strinseiten offen ist, um von einem zweiten Wärmeträgerfluid durchströmbar zu sein,
sowie ein Kältegerät, in dem ein solcher Wärmetauscher Verwendung findet. Ein solcher Wärmetauscher und ein solches Kältegerät sind aus US 5592829 bekannt.The present invention relates to a heat exchanger having an open, tube-like housing and a conduit disposed therein, which serves for guiding a first heat transfer fluid, and which has a developed length which is longer than the length of the housing, which is open at its two Strinseiten, to be flowed through by a second heat transfer fluid,
and a refrigeration device in which such a heat exchanger is used. Such a heat exchanger and such a refrigerator are out US 5592829 known.

Bei diesem bekannten Wärmetauscher ist die Leitung als Wendel ausgebildet. Das Gehäuse um die Wendel zwingt den Strom des zweiten Wärmeträgerfluids, an der Wendel auf ihrer gesamten Länge entlang zu streichen, um so eine hohe Wärmeaustauschleistung bei mäßigem Durchsatz des zweiten Wärmeträgerfluids zu erreichen.In this known heat exchanger, the line is designed as a helix. The housing around the helix forces the flow of the second heat transfer fluid to stroke along the helix along its entire length so as to achieve a high heat exchange capacity with a moderate throughput of the second heat transfer fluid.

Dabei ergibt sich jedoch das Problem, dass infolge des im wesentlichen zur Längsachse der Wendel parallelen Strömungsverlaufs durch den Wärmetauscher ein erheblicher Anteil des zweiten Wärmeträgerfluids den Wärmetauscher durchläuft, ohne überhaupt in engere Nachbarschaft zu der Leitung zu gelangen, während andere Teile der Strömung sukzessive an vielen Windungen der Wendel entlang streichen und sich dabei stark erwärmen.However, this results in the problem that due to the flow path substantially parallel to the longitudinal axis of the helix through the heat exchanger, a significant portion of the second heat transfer fluid passes through the heat exchanger, without ever get closer to the line, while other parts of the flow successively to many Swirl turns of the spiral along and heat up strongly.

Die US 2311947 zeigt einen Wärmetauscher entsprechend dem Oberbegriff des Anspruchs 1.The US 2311947 shows a heat exchanger according to the preamble of claim 1.

Eine Aufgabe der vorliegenden Erfindung ist, die Effizienz eines Wärmetauschers der eingangs angegebenen Art zu verbessern.An object of the present invention is to improve the efficiency of a heat exchanger of the type specified.

Dies wird erfindungsgemäß dadurch erreicht, dass die die Durchbrüche der Mantelfläche des Gehäuses entsprechend den kennzeichnenden Merkmalen des Anspruchs 1 ausgebildet sind.This is inventively achieved in that the breakthroughs of the lateral surface of the housing are formed according to the characterizing features of claim 1.

Diese Durchbrüche erlauben je nach in dem Gehäuse vorliegenden Druckverhältnissen einen Zu- oder Abfluss von zweitem Wärmeträgerfluid. Dessen Strömungsfeld im Innern des Gehäuses ist daher nicht rein in Längsrichtung orientiert, sondern es weist auch radiale Komponenten auf, so dass auch von den offenen Stirnseiten des Gehäuses entfernte Leitungsanteile, wie z.B. die Windungen einer Wendel oder Längsabschnitte einer mäanderartig geformten oder in wenigstens einer Schleife angeordneten Leitung, mit zweitem Wärmeträgerfluid angeströmt werden können, das noch nicht an einem anderen Abschnitt der Wendel oder des Mäanders vorgewärmt (oder, je nach Richtung des Wärmeflusses in dem Wärmetauscher, vorgekühlt) ist.Depending on the pressure conditions prevailing in the housing, these openings permit an inflow or outflow of the second heat transfer fluid. Its flow field in the interior of the housing is therefore not oriented purely in the longitudinal direction, but it also has radial components, so that even from the open end faces of the housing remote line components, such as the turns of a coil or longitudinal sections a meandering or arranged in at least one loop line can be supplied with second heat transfer fluid, which is not preheated at another portion of the coil or the meander (or, depending on the direction of the heat flow in the heat exchanger, pre-cooled).

Eine günstige, allseitige Beaufschlagung der Leitung innerhalb des Gehäuses mit noch nicht durch andere Leistungsabschnitte vorgewärmter Luft ergibt sich, wenn vorteilhafter Weise die Durchbrüche über den Umfang der Mantelfläche gleichmäßig verteilt mit gleichem oder auch unterschiedlichem Öffnungsquerschnitt angeordnet sind.A favorable, all-sided action on the line within the housing with not yet preheated by other power sections air results when advantageously the openings over the circumference of the lateral surface evenly distributed with the same or different opening cross-section are arranged.

Vorzugsweise nimmt der Anteil der Durchbrüche an der Oberfläche der Wand mit zunehmendem Abstand von einer ersten Stirnseite des Gehäuses ab.Preferably, the proportion of apertures on the surface of the wall decreases with increasing distance from a first end face of the housing.

Besonders günstig sind die Anströmverhältnisse und damit die Wärmeübertragung von der Leitung auf ein zweites Wärmeträgerfluid, wenn nach einer erfindungsgemäßen Ausführungsform der Öffnungsquerschnitt der Durchbrüche mit zunehmendem Abstand von der ersten Stirnseite abnimmt.Particularly favorable are the inflow conditions and thus the heat transfer from the line to a second heat transfer fluid, according to an embodiment of the invention, the opening cross-section of the apertures decreases with increasing distance from the first end face.

Eine der zweiten Stirnseite benachbarte Hälfte des Gehäuses kann von Durchbrüchen frei sein.One of the second end side adjacent half of the housing may be free of apertures.

Zum Antreiben des Stroms des zweiten Wärmeträgerfluids durch das Gehäuse ist der Wärmetauscher vorzugsweise mit einem Gebläse versehen.For driving the flow of the second heat transfer fluid through the housing, the heat exchanger is preferably provided with a blower.

Dieses Gebläse ist vorzugsweise an der zweiten Stirnseite des Gehäuses angeordnet.This fan is preferably arranged on the second end face of the housing.

Bezogen auf die Strömungsrichtung des zweiten Wärmeträgerfluids ist diese zweite Stirnseite vorzugsweise eine stromabwärtige Seite, d.h. das Gebläse saugt das zweite Wärmeträgerfluid durch das Gehäuse, und der komplette Strom des zweiten Kältemittels passiert die Öffnung an der zweiten Stirnseite, so dass er von dort abgeleitet und einer weiteren Nutzung zugeführt werden kann.With respect to the flow direction of the second heat transfer fluid, this second end face is preferably a downstream side, i. the blower sucks the second heat transfer fluid through the housing, and the complete flow of the second refrigerant passes through the opening on the second end face so that it can be diverted therefrom and supplied for further use.

Alternativ kann das Gebläse auch mittig in dem Gehäuse angeordnet sein; in diesem Fall kann ein von beiden Stirnseiten des Gehäuses zum Gebläse hin abnehmender Anteil der Durchbrüche an der Oberfläche der Wand vorgesehen werden, so dass durch die stromaufwärts vom Gebläse liegenden Durchbrüche zweites Wärmeträgerfluid in das Gehäuse eintreten und dieses durch die stromabwärts vom Gebläse liegenden Durchbrüche wieder verlassen kann.Alternatively, the fan may also be arranged centrally in the housing; In this case, a portion of the apertures, which decreases toward the fan from both end sides of the housing, can be provided on the surface of the wall, so that second heat carrier fluid flows into the opening through the apertures located upstream from the fan Enter housing and this can leave through the downstream of the fan breakthroughs again.

Gegenstand der Erfindung ist ferner ein Kältegerät, das einen Wärmetauscher in der oben angegebenen Art als Verflüssiger aufweist. Das zweite Wärmeträgerfluid ist in diesem Fall im allgemeinen Luft, während das erste Wärmeträgerfluid ein Kältemittel des Kältegeräts ist.The invention further relates to a refrigeration device having a heat exchanger in the above-mentioned manner as a condenser. The second heat transfer fluid in this case is generally air, while the first heat transfer fluid is a refrigerant of the refrigerator.

Weitere Merkmale und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung von Ausführungsbeispielen unter Bezugnahme auf die beigefügten Figuren.Further features and advantages of the invention will become apparent from the following description of embodiments with reference to the accompanying figures.

Es zeigen:

Fig. 1
eine perspektivische Ansicht eines erfindungsgemäßen Wärmetauschers;
Fig. 2
einen Längsschnitt durch den Wärmetauscher aus Fig. 1, der die Strömungsverhältnisse im Innern des Wärmetauschers verdeutlicht;
Fig. 3
einen Längsschnitt durch eine zweite Ausgestaltung des Wärmetauschers; und
Fig. 4
einen schematischen horizontalen Schnitt durch den Sockelbereich eines Kältegeräts, in welchem ein erfindungsgemäßer Wärmetauscher eingebaut ist.
Show it:
Fig. 1
a perspective view of a heat exchanger according to the invention;
Fig. 2
a longitudinal section through the heat exchanger Fig. 1 , which illustrates the flow conditions in the interior of the heat exchanger;
Fig. 3
a longitudinal section through a second embodiment of the heat exchanger; and
Fig. 4
a schematic horizontal section through the base region of a refrigerator, in which a heat exchanger according to the invention is installed.

Der in Fig. 1 gezeigte Wärmetauscher umfasst eine zu einer schraubenlinienförmigen Wendel gebogene Rohrleitung 1 für ein erstes Wärmeträgerfluid, vorzugsweise ein Kältemittel. Ein Gehäuse 2 erstreckt sich koaxial zur Längsachse A der Rohrleitung 1. Das Gehäuse 2 ist hier im wesentlichen aufgebaut aus zwei steifen Rahmenelementen 3, 4, welche entgegengesetzte Stirnseiten des Gehäuses 2 bilden, und einem sich um die äußeren Ränder der zwei Rahmenelemente 3, 4 erstreckenden, vier Seitenwände des Gehäuses bildenden Blech 5. Das dem Betrachteter zugewandte Rahmenelement 3 hat eine großflächige innere Öffnung 6; in eine entsprechende Öffnung 7 des anderen Rahmenelements 4 greifen radiale Streben 8 ein, die einen Elektromotor 9 koaxial zu der gewendelten Rohrleitung 1 tragen. Der Elektromotor 9 treibt ein aus dem Gehäuse 2 vorstehendes Ventilatorrad 10 an und bewirkt so einen Luftstrom durch das Gehäuse 2 von der Seite des Rahmenelements 3 zu der des Rahmenelements 4.The in Fig. 1 shown heat exchanger comprises a bent into a helical coil pipe 1 for a first heat transfer fluid, preferably a refrigerant. A housing 2 extends coaxially to the longitudinal axis A of the pipeline 1. The housing 2 is here essentially composed of two rigid frame members 3, 4, which form opposite end faces of the housing 2, and one around the outer edges of the two frame members 3, 4th extending the four side walls of the housing forming sheet 5. The facing the subject frame member 3 has a large-scale inner opening 6; in a corresponding opening 7 of the other Frame member 4 engage radial struts 8, which carry an electric motor 9 coaxial with the coiled tubing 1. The electric motor 9 drives a fan wheel 10 protruding from the housing 2 and thus effects an air flow through the housing 2 from the side of the frame element 3 to that of the frame element 4.

In das Blech 5 sind drei Gruppen 11a, 11b, 11c von Durchbrüchen 12 gestanzt. Die Abstände zwischen benachbarten Gruppen von Durchbrüchen nehmen mit zunehmender Entfernung von der Öffnung 6 zu, so dass der Anteil der Durchbrüche 12 an der Oberfläche des Blechs 5 mit zunehmender Entfernung von der Öffnung 6 abnimmt. Auf der zur Öffnung 7 benachbarten Hälfte des Blechs 5 sind keine Durchbrüche 12 vorhanden.Into the sheet 5 are three groups 11 a, 11 b, 11 c punched by openings 12. The distances between adjacent groups of apertures increase with increasing distance from the opening 6, so that the proportion of apertures 12 on the surface of the sheet 5 decreases with increasing distance from the opening 6. On the adjacent to the opening 7 half of the sheet 5 no openings 12 are present.

Fig. 2 veranschaulicht die Strömungsverhältnisse im Inneren des erfindungsgemäßen Wärmetauschers anhand eines axialen Schnitts. Ein Großteil der von dem Ventilatorrad 10 durch den Wärmetauscher geförderten Luft tritt in diesen durch die Öffnung 6 ein. Wenn dies die einzige Lufteintrittsöffnung wäre, so würde sich ein im wesentlichen zur Längsachse paralleler Luftstrom ergeben, bei dem ein Teil der Luft an der Rohrleitung 1 entlang fließt, während ein Großteil des Luftstroms durch das freie Innere der Wendel verläuft und dabei so gut wie keine Wärme von der Rohrleitung 1 aufnimmt. Hinzu kommt, dass die in einem solchen Fall in Strömungsrichtung hintereinander liegenden Windungen der Rohrleitung 1 den Luftstrom stark bremsen, so dass eine hohe Strömungsgeschwindigkeit, die einen wesentlichen Teil des Luftdurchsatzes des Wärmetauschers ausmacht, im leeren Innern der Wendel erreicht wird. Die Durchbrüche 12 hingegen erlauben einen Zustrom von Luft aus seitlicher Richtung, der im Inneren des Gehäuses 2 schräg zur Längsachse verläuft, so dass auch Wicklungen der Rohrleitung 1, die weit von der Eintrittsöffnung 6 entfernt sind, noch von kühler Frischluft erreicht werden. Fig. 2 illustrates the flow conditions in the interior of the heat exchanger according to the invention by means of an axial section. A majority of the air conveyed by the fan wheel 10 through the heat exchanger enters the latter through the opening 6. If this were the only air inlet opening, an air stream substantially parallel to the longitudinal axis would result, with part of the air flowing along the pipe 1, while a large part of the air flow will pass through the free interior of the coil, and hardly any Heat from the pipe 1 receives. In addition, the windings of the pipeline 1 lying one behind the other in the flow direction in such a case severely brake the air flow, so that a high flow velocity, which makes up a substantial part of the air flow rate of the heat exchanger, is achieved in the empty interior of the coil. The apertures 12, however, allow an influx of air from the lateral direction, which runs obliquely to the longitudinal axis in the interior of the housing 2, so that even windings of the pipeline 1, which are far away from the inlet opening 6, are still reached by cool fresh air.

Der Betrieb des Ventilators führt zu einem Druckradienten im Innern des Gehäuses 2, d.h. der Druckunterschied zwischen Gehäuseinnerem und Umgebung nimmt auf der Längsachse des Gehäuses zu, je näher man dem Gebläse kommt. Je höher der Druckunterschied zwischen innen und außen ist, umso stärker ist auch der Luftdurchsatz pro Flächeneinheit eines jeden Durchbruchs 12. Um sicher zu stellen, dass die Windungen möglichst gleichmäßig mit kühler Frischluft versorgt werden, muss daher, wie oben bereits angegeben, der Anteil der Durchbrüche 12 an der Oberfläche des Blechs 5 mit zunehmender Entfernung von der Öffnung 6 kleiner werden. Anstatt wie in Figs 1 und 2 gezeigt den Abstand zwischen den Gruppen 11a, 11b, 11c mit zunehmender Entfernung von der Öffnung 6 zu vergrößern, ließe sich dies natürlich auch erreichen, indem die Fläche der einzelnen Durchbrüche 12 umso kleiner gemacht wird, je weiter diese von der Öffnung 6 entfernt sind.The operation of the fan leads to a Druckradienten inside the housing 2, ie, the pressure difference between the housing interior and environment increases on the longitudinal axis of the housing, the closer you get to the fan. The higher the pressure difference between inside and outside, the stronger the air flow per unit area of each opening 12. To ensure that the windings are supplied as evenly as possible with cool fresh air, must therefore, as already stated, the proportion of the openings 12 on the surface of the sheet 5 with increasing distance from the opening 6 become smaller. Instead of as in FIGS. 1 and 2 Of course, as shown by increasing the distance between the groups 11a, 11b, 11c with increasing distance from the opening 6, this could also be achieved by making the area of the individual openings 12 smaller the farther they are from the opening 6.

Eine abgewandelte Ausgestaltung eines erfindungsgemäßen Wärmetauschers ist in Fig. 3 in einem zu Fig. 2 analogen Schnitt gezeigt. Bei dieser Ausgestaltung ist das durch den Elektromotor 9 und das Ventilatorrad 10 gebildete Gebläse mittig in dem Wärmetauscher, im Inneren der von der Rohrleitung 1 gebildeten Wendel, angeordnet. Benachbart zur stromaufwärtigen Öffnung 6 des Gehäuses 2 sind auch hier zwei Gruppen von Durchbrüchen 12 gebildet, und spiegelbildlich hierzu befinden sich weitere Durchbrüche 13 in einem zur stromabwärtigen Öffnung 7 benachbarten Bereich des Blechs 5. Diese Durchbrüche 13 verleihen der Luftströmung stromabwärts vom Gebläse eine radial nach außen gerichtete Geschwindigkeitskomponente, so dass auch hier vermieden wird, dass eine Windung der Rohrleitung 1 im Windschatten einer benachbarten Windung liegt und nur unzureichend mit Kühlluft versorgt wird.A modified embodiment of a heat exchanger according to the invention is in Fig. 3 in one too Fig. 2 shown analogue section. In this embodiment, the blower formed by the electric motor 9 and the fan wheel 10 is arranged centrally in the heat exchanger, inside the coil formed by the pipe 1. Adjacent to the upstream opening 6 of the housing 2, two groups of openings 12 are formed here, and mirror images of this are further openings 13 in a region adjacent to the downstream opening 7 area of the sheet 5. These openings 13 lend the air flow downstream of the fan a radially to outwardly directed velocity component, so that it is also avoided here that a turn of the pipe 1 is in the lee of an adjacent turn and is supplied insufficiently with cooling air.

Um einen Rückstrom von Luft in Inneren des Gehäuses 2 von der stromabwärtigen zur stromaufwärtigen Seite des Gebläses in dem außerhalb der Wendel liegenden Querschnittsbereich zu verhindern, ist hier eine Trennwand 14 vorgesehen, die sich von dem die Außenwand des Gehäuses 2 bildenden Blech 5 in Höhe des Ventilatorrades 10 bis in unmittelbare Nähe der Wendel erstreckt.In order to prevent a backflow of air in the interior of the housing 2 from the downstream to the upstream side of the fan in the lying outside the coil cross-sectional area, here is a partition wall 14 which extends from the outer wall of the housing 2 forming sheet 5 in height Fan wheel 10 extends into the immediate vicinity of the helix.

Fig. 4 zeigt als ein Anwendungsbeispiel des erfindungsgemäßen Wärmetauschers einen horizontalen Schnitt durch einen Kühl- oder Gefrierschrank mit einem Korpus 20 und einer Tür 21. In einem bodennahen Bereich des Korpus 20, an der von der Tür 21 abgewandten Seite, ist eine Maschinenraumnische 22 ausgespart, in der nebeneinander als Verflüssiger 23 für ein Kältemittel der in Fig. 1 bzw. 2 gezeigte Wärmetauscher und ein Verdichter 24 untergebracht sind. Die Rohrleitung 1 des Verflüssigers 23 ist an einen Hochdruckauslass des Verdichters 24 angeschlossen. Ein Kältemittel und durch das Gebläse angetriebene Frischluft durchlaufen den Verflüssiger 23 in entgegengesetzte Richtungen. Im Verflüssiger 23 erwärmte Frischluft strömt den Verdichter 24 an und kühlt diesen; außerdem fördert sie die Verdunstung von aus dem Innenraum 25 des Kältegeräts abgeleiteten Kondenswasser in einer auf dem Verdichter 24 montierten Verdunstungsschale 26. Luftein- und -austrittsöffnungen 27 bzw. 28 sind hier in seitlichen Wänden der Maschinenraumnische 22 gebildet; alternativ könnten sie in deren Boden vorgesehen sein, um Frischluft durch einen unterhalb des Korpus 20 liegenden hohlen Gerätesockel zu- und abzuführen, oder die Rückseite der Maschinenraumnische 22 könnte stellenweise offen gelassen sein, um Luftaustausch zu ermöglichen. Fig. 4 shows as an example of application of the heat exchanger according to the invention a horizontal section through a refrigerator or freezer with a body 20 and a door 21. In a near-ground region of the body 20, on the side facing away from the door 21, a machine room niche 22 is recessed in the side by side as condenser 23 for a refrigerant of in Fig. 1 or 2 shown heat exchanger and a compressor 24 are housed. The pipe 1 of the condenser 23 is connected to a high-pressure outlet of the compressor 24. A refrigerant and fresh air driven by the blower pass through the condenser 23 in opposite directions. Fresh air heated in the condenser 23 flows to the compressor 24 and cools this; In addition, it promotes the evaporation of condensate discharged from the interior 25 of the refrigerator in an evaporation tray 26 mounted on the compressor 24. Air inlet and outlet openings 27 and 28 are formed here in lateral walls of the machine room niche 22; alternatively, they could be provided in the bottom thereof to supply and discharge fresh air through a hollow equipment base underlying the body 20, or the back of the engine room niche 22 could be left open in places to allow air exchange.

Claims (11)

  1. Heat exchanger (23) comprising a tube-like housing (2) which is open at its two ends and within which a duct (1) is arranged, which serves for conducting a first heat carrier fluid and which has an unwound length longer than the length of the housing (2), the circumferential surface of which is provided in sections with passages (12, 13) at least in the region of a first end, characterised in that the proportion of passages (12) at the circumferential surface (15) decreases with increasing spacing from the first end (6) of the housing (2) and/or the opening cross-section of the passages (12) decreases with increasing spacing from the first end (6).
  2. Heat exchanger according to claim 1, characterised in that the passages (12, 13) are arranged to be uniformly distributed over the circumference of the circumferential surface of the housing (2).
  3. Heat exchanger according to one of claims 1 and 2, characterised in that a half of the housing (2) adjacent to the second end (7) is free of passages (12).
  4. Heat exchanger according to any one of claims 1 to 3, characterised in that the duct (1) is formed to helical and the helix length corresponds at least approximately with the length of the housing (2).
  5. Heat exchanger according to any one of claims 1 to 4, characterised in that the duct (1) is formed to be meander-like and the length of the meander approximately corresponds with the length of the housing (2).
  6. Heat exchanger according to any one of claims 1 to 5, characterised in that a fan (9, 10) for driving a flow of a second heat carrier fluid through the housing (2) is provided.
  7. Heat exchanger according to one of claims 1 or 6 and claim 3, characterised in that the fan (9, 10) is arranged at the second end (7) of the housing (2).
  8. Heat exchanger according to any one of claims 1 to 7, characterised in that the second end (7) is a downstream end with respect to the flow direction of the second heat carrier fluid.
  9. Heat exchanger according to claim 6, characterised in that the fan (9, 10) is arranged centrally in the housing (2).
  10. Heat exchanger according to claim 9, characterised in that the proportion of the passages (12, 13) at the surface of the wall decreases from both ends (6, 7) of the housing towards the fan (9, 10).
  11. Refrigerating appliance, characterised in that it comprises a heat exchanger (23) according to any one of the preceding claims as condenser.
EP06725516A 2005-05-10 2006-04-03 Heat exchanger for a refrigerating device Not-in-force EP1880158B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005021554A DE102005021554A1 (en) 2005-05-10 2005-05-10 Heat exchanger for a refrigeration device
PCT/EP2006/061270 WO2006120083A1 (en) 2005-05-10 2006-04-03 Heat exchanger for a refrigerating device

Publications (2)

Publication Number Publication Date
EP1880158A1 EP1880158A1 (en) 2008-01-23
EP1880158B1 true EP1880158B1 (en) 2010-08-11

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EP06725516A Not-in-force EP1880158B1 (en) 2005-05-10 2006-04-03 Heat exchanger for a refrigerating device

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US (1) US8881547B2 (en)
EP (1) EP1880158B1 (en)
CN (1) CN100582630C (en)
AT (1) ATE477465T1 (en)
DE (2) DE102005021554A1 (en)
ES (1) ES2347909T3 (en)
RU (1) RU2398171C2 (en)
WO (1) WO2006120083A1 (en)

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TR200808917A2 (en) * 2008-11-21 2010-06-21 Bsh Ev Aletleri̇ San. Ve Ti̇c. A.Ş. A cooler containing coil condenser
DE102009000844A1 (en) 2009-02-13 2010-08-19 BSH Bosch und Siemens Hausgeräte GmbH Heat exchanger, in particular condenser for a household refrigerator
DE102009001720B4 (en) * 2009-03-20 2011-04-21 Komitec Automation Gmbh Multichannel flat tube heat exchanger, in particular for household refrigerators
CN101995117B (en) * 2010-10-12 2012-07-04 宣伯民 Pipe-flowing type condenser for room air conditioner
DE102012008268A1 (en) * 2012-04-18 2013-10-24 Liebherr-Hausgeräte Ochsenhausen GmbH Fridge and / or freezer
CN105135910B (en) * 2015-08-14 2018-12-07 安徽蓝盾光电子股份有限公司 A kind of cooling device of high-temperature gas
CN105937859B (en) * 2016-06-01 2018-05-18 广东水利电力职业技术学院 A kind of bushing type cooling system
CN110793128A (en) * 2018-08-02 2020-02-14 宁波方太厨具有限公司 Heat exchange device, range hood with heat exchange device and kitchen air conditioning system
CN111907682B (en) * 2020-07-29 2021-10-12 武汉第二船舶设计研究所(中国船舶重工集团公司第七一九研究所) Multi-unit integrated type ship cooler
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CN100582630C (en) 2010-01-20
WO2006120083A1 (en) 2006-11-16
US8881547B2 (en) 2014-11-11
DE502006007646D1 (en) 2010-09-23
EP1880158A1 (en) 2008-01-23
RU2007137813A (en) 2009-06-20
CN101171492A (en) 2008-04-30
ES2347909T3 (en) 2010-11-25
US20090090126A1 (en) 2009-04-09
ATE477465T1 (en) 2010-08-15
RU2398171C2 (en) 2010-08-27
DE102005021554A1 (en) 2006-11-16

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