EP0256259B1 - Heat-exchanger, more particularly evaporator for refrigerant - Google Patents

Heat-exchanger, more particularly evaporator for refrigerant Download PDF

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Publication number
EP0256259B1
EP0256259B1 EP87109107A EP87109107A EP0256259B1 EP 0256259 B1 EP0256259 B1 EP 0256259B1 EP 87109107 A EP87109107 A EP 87109107A EP 87109107 A EP87109107 A EP 87109107A EP 0256259 B1 EP0256259 B1 EP 0256259B1
Authority
EP
European Patent Office
Prior art keywords
caps
heat exchanger
flat tubes
exchanger according
adjacent
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP87109107A
Other languages
German (de)
French (fr)
Other versions
EP0256259A1 (en
Inventor
Wolfgang Hesse
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.)
Mahle Behr GmbH and Co KG
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Behr GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Behr GmbH and Co KG filed Critical Behr GmbH and Co KG
Priority to AT87109107T priority Critical patent/ATE47221T1/en
Publication of EP0256259A1 publication Critical patent/EP0256259A1/en
Application granted granted Critical
Publication of EP0256259B1 publication Critical patent/EP0256259B1/en
Expired legal-status Critical Current

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Classifications

    • 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
    • F28D1/053—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 straight
    • F28D1/0535—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 straight the conduits having a non-circular cross-section
    • F28D1/05366—Assemblies of conduits connected to common headers, e.g. core type radiators
    • F28D1/05375—Assemblies of conduits connected to common headers, e.g. core type radiators with particular pattern of flow, e.g. change of flow direction
    • 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
    • F25B39/02—Evaporators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F28F9/0219—Arrangements for sealing end plates into casing or header box; Header box sub-elements
    • F28F9/0221—Header boxes or end plates formed by stacked 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
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/26—Arrangements for connecting different sections of heat-exchange elements, e.g. of radiators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2220/00—Closure means, e.g. end caps on header boxes or plugs on conduits
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S165/00—Heat exchange
    • Y10S165/454—Heat exchange having side-by-side conduits structure or conduit section
    • Y10S165/507—Straight side-by-side conduits joined for flow of one fluid

Definitions

  • the invention relates to a heat exchanger according to the preamble of claim 1.
  • Heat exchangers of this type which can be used in particular for refrigerant evaporators, have been proposed in the unpublished DE-A 3 502 619 (or the corresponding FR-A 2 576 678).
  • tubes must be provided at the outer ends of the tube block formed from flat tubes, which have only one opening in the expanded part, which adjoins the adjacent tube.
  • the other side which determines the end of the heat exchanger, must be closed.
  • the heat exchanger is to be provided with different pipe runs, i.e. that is, if the heat exchange medium is to be zigzagged through the flat tubes or through groups of these.
  • the invention is therefore based on the object of constructing a heat exchanger of the type mentioned at the outset in a simpler and more installation-friendly manner. This is achieved in a heat exchanger of the type mentioned by the characterizing features of claim 1.
  • all flat tubes can be of the same design and can each be provided with two opposite openings in the expanded parts.
  • the closure of individual openings can then optionally be carried out where it is desired, with only an exchange of the caps provided anyway for closing the pipe ends having to be carried out. It is also advantageous that after the caps have been put on, it can also be checked from the outside at any time where one of the two openings of the flat tube is closed, ie. H. where, for example, a new pipe run begins.
  • a heat exchanger (1) in the form of a refrigerant evaporator which consists of several identically designed flat tubes (2), each provided with an end region (2a) which is enlarged relative to the central part (2b) and with these end areas, which have the shape of an oval, are placed directly against one another.
  • the expanded parts (2a) are each provided on the two opposite and parallel wall sides with openings (5) which are flush with one another when the flat tubes are placed against one another, since all flat tubes are of identical design. This is also brought about by the fact that (see FIG. 1) the right-hand opening of each enlarged part (2a) is provided with an outwardly projecting nozzle (110) which fits into the opening (5) of the adjacent part ( 2a) fits in.
  • All flat tubes (2) can therefore be put together with their expanded parts (2a) by this design and mutually fixed in position before they are soldered.
  • a fin insert (11) is used between two adjacent flat tubes (2), which serves to increase the heat exchange between the flat tubes and the medium flowing between them.
  • air is passed in the direction of the drawing plane through these intermediate spaces and through the rib inserts (11), which is cooled as the refrigerant evaporator flows through.
  • Turbulence inserts (14) are provided within the central region (2b) of each flat tube and are inserted into the tubes in a manner not described here.
  • the heat exchanger (1) is closed to the outside by side parts (13), which can be soldered to the flat tubes or attached to the flat tube block in some other way.
  • the refrigerant or the heat exchange medium is supplied and removed through the supply line (15) and through the discharge line (16).
  • All flat tubes (2) are sealed at both ends by caps (3) or (4) and thus form a flat tube block into which the heat exchange medium can be introduced via the feed line (15).
  • caps (3) or (4) In order to ensure that the heat exchange medium flows through the flat tube block as evenly as possible, it is initially provided that adjacent tubes (2) are closed at the top by caps (4) adjacent to the flat tube (2 ') to which the heat exchange medium is supplied , as will be explained with reference to FIGS. 4 to 6, bowl-shaped, but with depressions (6) are provided, each having wall parts (7) which are designed such that when the cap (4) is inserted they can close one of the two openings (5) in the expanded parts (2a) of the flat tubes.
  • caps (3) are sealed with caps (3), the shape of which is also clear from FIGS. 7 to 9. Due to the design according to the invention, it is therefore sufficient to keep flat tubes of identical shape in stock, which are then assembled as required to form heat exchangers of a certain desired length and can optionally be closed by caps so that the desired flow is achieved. After inserting the caps and the end caps, not described in detail, which are provided for inflow and outflow connections, the flat tube block is soldered so that the caps (3, 4) close in the ends of the flat tubes (2) and this through the Interlocking of the nozzle (110) and the openings (5) are also held close together.
  • the flat tubes provided in the exemplary embodiment have expanded parts (2a) which do not correspond to the full width (b) of the heat exchanger.
  • the flat tubes were produced in this embodiment by starting from tubes with an oval cross-section corresponding to the expanded parts (2a) in the central region (2b) were flat-rolled or pressed.
  • FIGS. 4 to 6 show the configuration of the cap (4) which is used in the heat exchanger of FIGS. 1 to 3.
  • the cap (4) is bowl-shaped and sits with its edges (17) tightly in the upstanding edge (18) of the enlarged parts (2a) of the associated flat tubes (2).
  • the cap (4) has a recess (6) which has a wall part (7) which, as shown in FIG. 5, the left opening (5 ') of the two openings (5', 5) in the expanded part ( 2a) of the flat tube (2) completes.
  • the recess (6) is closed off by an inclined wall (19) opposite in the wall part, which runs in such a way that it also serves as a flow guide surface for the heat exchange medium flowing between the opening (5) and the region (2b).
  • each cap (3) also consists of a shell-shaped part, the outwardly facing edges (20) of which are adapted to the inner cross section of the enlarged part (2a) of each flat tube (2).
  • These cup-shaped caps (3) have stiffening beads (9) which run transversely to the longitudinal axis (10) of the oval shape and serve to increase the strength of the caps (3).
  • These caps are used only for the outer end of each flat tube (2). Like the caps (4), they are soldered tightly in the flat tubes (2).

Abstract

A heat exchanger, particularly a coolant evaporator, is provided that has several flat pipes that are arranged parallel to one another and are each expanded at their ends with respect to a central part and are closed off by caps. The expanded ends are provided with connecting openings so that the heat exchange medium can flow to the adjacent pipe. At least one of the caps that are provided for closing off the pipe ends is equipped with a projection extending towards the inside of the pipe and closes off at least one of the connecting openings, so that the production of a heat exchanger of identically constructed flat pipes is simplified, in that by the insertion of correponding caps that either expose the connecting openings to the adjacent pipes or not, it is easy to control the flow of the heat exchange medium inside the flat pipes.

Description

Die Erfindung betrifft einen Wärmetauscher nach dem Oberbegriff des Patentanspruches 1.The invention relates to a heat exchanger according to the preamble of claim 1.

Wärmetauscher dieser Art, die insbesondere für Kältemittel-Verdampfer eingesetzt werden können, sind in der nicht vorveröffentlichten DE-A 3 502 619 (bzw. der korrespondierenden FR-A 2 576 678) vorgeschlagen worden. Dort müssen jedoch jeweils an den äußeren Enden des aus Flachrohren gebildeten Rohrblockes Rohre vorgesehen werden, die in dem erweiterten Teil nur eine Öffnung aufweisen, die an das benachbarte Rohr angrenzt. Die andere Seite, die das Ende des Wärmetauschers bestimmt, muß geschlossen sein. Gleiches gilt auch dann, wenn der Wärmetauscher mit verschiedenen Rohrzügen versehen sein soll, d. h., wenn das Wärmetauschmittel im Zick-Zack durch die Flachrohre oder durch Gruppen von diesen geführt werden soll. Nachteilig ist daher, daß mindestens zwei Typen von Flachrohren gefertigt und zum Zusammensetzen des Wärmetauschers auf Lager gehalten werden müssen, was den Bauaufwand für solche Wärmetauscher erhöht. Nachteilig ist auch, daß beim fertigen Wärmetauscher nicht oder nur sehr umständlich festgestellt werden kann, wo Umlenkstellen der Rohrzüge vorgesehen sind.Heat exchangers of this type, which can be used in particular for refrigerant evaporators, have been proposed in the unpublished DE-A 3 502 619 (or the corresponding FR-A 2 576 678). There, however, tubes must be provided at the outer ends of the tube block formed from flat tubes, which have only one opening in the expanded part, which adjoins the adjacent tube. The other side, which determines the end of the heat exchanger, must be closed. The same also applies if the heat exchanger is to be provided with different pipe runs, i.e. that is, if the heat exchange medium is to be zigzagged through the flat tubes or through groups of these. It is therefore disadvantageous that at least two types of flat tubes have to be manufactured and kept in stock for assembling the heat exchanger, which increases the construction costs for such heat exchangers. Another disadvantage is that in the finished heat exchanger it cannot be determined, or only with great difficulty, where the deflection points of the pipe runs are provided.

Der Erfindung liegt daher die Aufgabe zugrunde, einen Wärmetauscher der eingangs genannten Art einfacher und montagefreundlicher aufzubauen. Dies wird bei einem Wärmetauscher der eingangs genannten Art durch die kennzeichnenden Merkmale des Patentanspruches 1 erreicht.The invention is therefore based on the object of constructing a heat exchanger of the type mentioned at the outset in a simpler and more installation-friendly manner. This is achieved in a heat exchanger of the type mentioned by the characterizing features of claim 1.

Durch diese Ausgestaltung können alle Flachrohre gleich ausgebildet werden und jeweils mit zwei gegenüberliegenden Öffnungen in den erweiterten Teilen versehen sein. Der Abschluß einzelner Öffnungen kann dann wahlweise dort vorgenommen werden, wo er gewünscht ist, wobei nur ein Austausch der ohnehin zum Verschließen der Rohrenden vorgesehenen Kappen vorgenommen werden muß. Vorteilhaft ist außerdem, daß nach dem Aufsetzen der Kappen auch von außen jederzeit überprüfbar ist, wo eine der beiden Offnungen des Flachrohres verschlossen ist, d. h. wo beispielsweise ein neuer Rohrzug beginnt.With this configuration, all flat tubes can be of the same design and can each be provided with two opposite openings in the expanded parts. The closure of individual openings can then optionally be carried out where it is desired, with only an exchange of the caps provided anyway for closing the pipe ends having to be carried out. It is also advantageous that after the caps have been put on, it can also be checked from the outside at any time where one of the two openings of the flat tube is closed, ie. H. where, for example, a new pipe run begins.

Weitere Merkmale und Vorteile ergeben sich aus den Unteransprüchen.Further features and advantages result from the subclaims.

In der nachfolgenden Beschreibung wird an Hand der Zeichnungen ein Ausführungsbeispiel der Erfindung beschrieben. Es zeigen:

  • Fig. 1 einen schematischen Längsschnitt durch einen Wärmetauscher in der Form eines Kältemittel-Verdampfers,
  • Fig. 2 die Draufsicht auf den Wärmetauscher der Fig.1,
  • Fig. 3 die Seitenansicht des Wärmetauschers der Fig. 1 in Richtung des Pfeiles 111 gesehen, jedoch mit abgenommenem Seitenteil,
  • Fig. 4 den schematischen Schnitt durch das obere Ende des in den Fig. 1 und 2 äußersten linken Flachrohres in vergrößertem Maßstab,
  • Fig. 5 den schematischen Schnitt durch die Fig. 4 längs der Linie V-V,
  • Fig. 6 die Draufsicht auf das obere Rohrende der Fig. 4,
  • Fig. 7 den Schnitt ähnlich Fig. 4, jedoch durch das zweite Flachrohr von rechts, links der Linie VII-VII und ebenfalls in vergrößertem Maßstab,
  • Fig. 8 den Schnitt durch Fig. 7 längs der Linie VI-II-VIII und
  • Fig. 9 die Draufsicht auf das obere Rohrende der Fig. 7.
In the following description, an embodiment of the invention is described with reference to the drawings. Show it:
  • 1 shows a schematic longitudinal section through a heat exchanger in the form of a refrigerant evaporator,
  • 2 shows the top view of the heat exchanger of FIG. 1,
  • 3 seen the side view of the heat exchanger of FIG. 1 in the direction of arrow 111, but with the side part removed,
  • 4 shows the schematic section through the upper end of the left-hand flat tube outermost in FIGS. 1 and 2 on an enlarged scale,
  • 5 shows the schematic section through FIG. 4 along the line VV,
  • 6 is a top view of the upper tube end of FIG. 4,
  • 7 shows the section similar to FIG. 4, but through the second flat tube from the right, left of the line VII-VII and also on an enlarged scale,
  • Fig. 8 shows the section through Fig. 7 along the line VI-II-VIII and
  • 9 is a top view of the upper tube end of FIG. 7.

In den Fig. 1 bis 3 ist ein Wärmetauscher (1) in der Form eines Kältemittel-Verdampfers gezeigt, der aus mehreren identisch ausgebildeten Flachrohren (2) besteht, die jeweils mit einem gegenüber dem Mittelteil (2b) erweiterten Endbereich (2a) versehen und mit diesen Endbereichen, welche die Form eines Ovals haben, unmittelbar aneinandergelegt sind. Beim Ausführungsbeispiel sind die erweiterten Teile (2a) jeweils auf den beiden gegenüberliegenden und zueinander parallelen Wandseiten mit Öffnungen (5) versehen, die beim Aneinanderlegen der Flachrohre, da alle Flachrohre identisch ausgebildet sind, untereinander fluchten. Dies wird auch noch dadurch bewirkt, daß jeweils (s. Fig. 1) die nach rechts weisende Öffnung jedes erweiterten Teiles (2a) mit einem nach außen vorspringenden Stutzen (110) versehen ist, der in die Öffnung (5) des benachbarten Teiles (2a) hereinpaßt. Alle Flachrohre (2) lassen sich daher durch diese Ausbildung mit ihren erweiterten Teilen (2a) aneinandersetzen und in ihrer Lage gegenseitig fixieren, ehe sie verlötet werden. Dabei wird, wie auch bei anderen Bauarten bekannt, jeweils zwischen zwei aneinandergrenzende Flachrohre (2) ein Rippeneinsatz (11) eingesetzt, der zur Erhöhung des Wärmeaustausches zwischen den Flachrohren und dem zwischen ihnen durchströmenden Medium dient. Beim Ausführungsbeispiel wird beispielsweise Luft in Richtung zur Zeichenebene durch diese Zwischenräume und durch die Rippeneinsätze (11) hindurchgeführt, die beim Durchströmen des Kältemittel-Verdampfers abgekühlt wird.1 to 3, a heat exchanger (1) in the form of a refrigerant evaporator is shown, which consists of several identically designed flat tubes (2), each provided with an end region (2a) which is enlarged relative to the central part (2b) and with these end areas, which have the shape of an oval, are placed directly against one another. In the exemplary embodiment, the expanded parts (2a) are each provided on the two opposite and parallel wall sides with openings (5) which are flush with one another when the flat tubes are placed against one another, since all flat tubes are of identical design. This is also brought about by the fact that (see FIG. 1) the right-hand opening of each enlarged part (2a) is provided with an outwardly projecting nozzle (110) which fits into the opening (5) of the adjacent part ( 2a) fits in. All flat tubes (2) can therefore be put together with their expanded parts (2a) by this design and mutually fixed in position before they are soldered. As is also known for other types of construction, a fin insert (11) is used between two adjacent flat tubes (2), which serves to increase the heat exchange between the flat tubes and the medium flowing between them. In the exemplary embodiment, for example, air is passed in the direction of the drawing plane through these intermediate spaces and through the rib inserts (11), which is cooled as the refrigerant evaporator flows through.

Innerhalb des Mittelbereiches (2b) jedes Flachrohres sind Turbulenzeinlagen (14) vorgesehen, die in hier nicht näher zu beschreibender Weise in die Rohre eingesetzt werden. Nach außen wird der Wärmetauscher (1) jeweils durch Seitenteile (13) abgeschlossen, die mit den Flachrohren verlötet oder auch in anderer Weise an dem Flachrohrblock befestigt werden können.Turbulence inserts (14) are provided within the central region (2b) of each flat tube and are inserted into the tubes in a manner not described here. The heat exchanger (1) is closed to the outside by side parts (13), which can be soldered to the flat tubes or attached to the flat tube block in some other way.

Die Zu- und Abfuhr des Kältemittels bzw. des Wärmetauschmediums erfolgt durch die Zuführleitung (15) und durch die Abführleitung (16).The refrigerant or the heat exchange medium is supplied and removed through the supply line (15) and through the discharge line (16).

Alle Flachrohre (2) sind an ihren beiden Enden dicht durch Kappen (3) bzw. (4) verschlossen und bilden somit einen Flachrohrblock, in den das Wärmetauschmittel über die Zuführleitung (15) eingeführt werden kann. Um zu erreichen, daß das Wärmetauschmittel den Flachrohrblock möglichst gleichmäßig durchströmt, ist zunächst vorgesehen, daß angrenzend an das Flachrohr (2'), dem das Wärmetauschmittel oben zugeführt wird, die benachbarten Rohre (2) oben durch Kappen (4) verschlossen werden, die, wie noch anhand der Fig. 4 bis 6 erläutert werden wird, schalenförmig, aber mit Vertiefungen (6) versehen sind, die jeweils Wandteile (7) aufweisen, die so ausgebildet sind, daß sie bei eingesetzter Kappe (4) eine der beiden Öffnungen (5) in den erweiterten Teilen (2a) der Flachrohre verschließen können. Fig. 1 zeigt, daß die äußere der beiden Kappen (4) mit ihrer Verschlußwand an der Außenseite des äußersten Flachrohres anliegt, so daß dadurch der Flachrohrblock nach außen abgeschlossen ist. In dem an das Rohr (2') rechts angrenzenden Flachrohr ist die Kappe (4) anders herum eingesetzt, so daß ihr Wandteil (7) die nach rechts weisende Öffnung (5) verschließt. Das durch die Zuführleitung (15) zugeführte Wärmetauschmittel wird dadurch gezwungen, in den drei benachbarten Flachrohren nach unten zu strömen, von wo es es wiederum in die drei benachbarten Rohre bis zu dem Rohr (2') strömen kann, dessen unterer erweiterter Teil (2a') durch eine Kappe (4) so abgeschlossen ist, daß das Wärmetauschmittel nicht nach außen und nicht zum rechts benachbarten Rohr strömen kann. Im oberen Bereich ist das 5. Flachrohr von rechts wiederum mit einer Kappe (4) ausgestattet, so daß in dem Flachrohrblock eine Zick-Zack-Strömung des Wärmetauschmittels bewirkt wird, ehe diese durch den Ablaufstutzen (16) abgeführt wird.All flat tubes (2) are sealed at both ends by caps (3) or (4) and thus form a flat tube block into which the heat exchange medium can be introduced via the feed line (15). In order to ensure that the heat exchange medium flows through the flat tube block as evenly as possible, it is initially provided that adjacent tubes (2) are closed at the top by caps (4) adjacent to the flat tube (2 ') to which the heat exchange medium is supplied , as will be explained with reference to FIGS. 4 to 6, bowl-shaped, but with depressions (6) are provided, each having wall parts (7) which are designed such that when the cap (4) is inserted they can close one of the two openings (5) in the expanded parts (2a) of the flat tubes. Fig. 1 shows that the outer of the two caps (4) rests with its closure wall on the outside of the outermost flat tube, so that the flat tube block is thereby closed to the outside. The cap (4) is inserted the other way around in the flat tube adjoining the tube (2 ') on the right, so that its wall part (7) closes the opening (5) pointing to the right. The heat exchange medium fed through the feed line (15) is thereby forced to flow downward in the three adjacent flat tubes, from where it can in turn flow into the three adjacent tubes up to the tube (2 '), the lower, enlarged part (2a ') is completed by a cap (4) so that the heat exchange medium cannot flow outwards and not to the tube on the right. In the upper area, the 5th flat tube is again fitted with a cap (4) from the right, so that a zigzag flow of the heat exchange medium is brought about in the flat tube block before it is discharged through the outlet connection (16).

Die nicht mit den Kappen (4) verschlossenen erweiterten Teile (2a) sind mit Kappen (3) dicht verschlossen, deren Form anhand der Fig. 7 bis 9 ebenfalls deutlich wird. Durch die erfindungsgemäße Ausgestaltung reicht es daher aus, Flachrohre von identischer Form auf Lager zu halten, die dann nach Bedarf zu Wärmetauschern bestimmter gewünschter Länge zusammengesetzt werden und durch Kappen wahlweise so verschlossen werden können, daß die gewünschte Durchströmung erreicht ist. Nach dem Einsetzen der Kappen und der, nicht im einzelnen beschriebenen Abschlußkappen, die für Zu- und Abflußstutzen vorgesehen sind, wird der Flachrohrblock verlötet, so daß die Kappen (3, 4) dicht in den Enden der Flachrohre (2) und diese durch das Ineinandergreifen der Stutzen (110) und der Öffnungen (5) auch dicht aneinander gehalten sind. Die beim Ausführungsbeispiel vorgesehenen Flachrohre weisen dabei erweiterte Teile (2a) auf, die nicht der vollen Breite (b) des Wärmetauschers entsprechen. Die Flachrohre sind bei dieser Ausführung dadurch hergestellt worden, daß ausgehend von Rohren mit einem ovalen Querschnitt entsprechend den erweiterten Teilen (2a) in dem mittleren Bereich (2b) flachgewalzt oder -gepreßt wurden.The expanded parts (2a) which are not closed with the caps (4) are sealed with caps (3), the shape of which is also clear from FIGS. 7 to 9. Due to the design according to the invention, it is therefore sufficient to keep flat tubes of identical shape in stock, which are then assembled as required to form heat exchangers of a certain desired length and can optionally be closed by caps so that the desired flow is achieved. After inserting the caps and the end caps, not described in detail, which are provided for inflow and outflow connections, the flat tube block is soldered so that the caps (3, 4) close in the ends of the flat tubes (2) and this through the Interlocking of the nozzle (110) and the openings (5) are also held close together. The flat tubes provided in the exemplary embodiment have expanded parts (2a) which do not correspond to the full width (b) of the heat exchanger. The flat tubes were produced in this embodiment by starting from tubes with an oval cross-section corresponding to the expanded parts (2a) in the central region (2b) were flat-rolled or pressed.

Die Fig. 4 bis 6 zeigen die Ausgestaltung der Kappe (4), die bei dem Wärmetauscher der Fig. 1 bis 3 eingesetzt ist. Die Kappe (4) ist schalenförmig ausgebildet und sitzt mit ihren Rändern (17) dicht in dem nach oben stehenden Rand (18) der erweiterten Teile (2a) der zugeordneten Flachrohre (2). Die Kappe (4) besitzt dabei eine Vertiefung (6), die einen Wandteil (7) aufweist, der, wie Fig. 5 zeigt, die linke Öffnung (5') der beiden Öffnungen (5', 5) in dem erweiterten Teil (2a) des Flachrohres (2) abschließt. Die Vertiefung (6) wird dabei durch eine in dem Wandteil gegenüberliegende schräg verlaufende Wand (19) abgeschlossen, die so verläuft, daß sie auch als Strömungsleitfläche für das zwischen der Öffnung (5) und dem Bereich (2b) strömende Wärmetauschmittel dient.4 to 6 show the configuration of the cap (4) which is used in the heat exchanger of FIGS. 1 to 3. The cap (4) is bowl-shaped and sits with its edges (17) tightly in the upstanding edge (18) of the enlarged parts (2a) of the associated flat tubes (2). The cap (4) has a recess (6) which has a wall part (7) which, as shown in FIG. 5, the left opening (5 ') of the two openings (5', 5) in the expanded part ( 2a) of the flat tube (2) completes. The recess (6) is closed off by an inclined wall (19) opposite in the wall part, which runs in such a way that it also serves as a flow guide surface for the heat exchange medium flowing between the opening (5) and the region (2b).

Die Fig. 7 bis 9 machen deutlich, daß jede Kappe (3) ebenfalls aus einem schalenförmigen Teil besteht, dessen nach außen weisende Ränder (20) dem Innenquerschnitt des erweiterten Teiles (2a) jedes Flachrohres (2) angepaßt sind. Diese schalenförmige Kappen (3) besitzen quer zur Längsachse (10) der Ovalform verlaufende Versteifungssicken (9), die dazu dienen, die Festigkeit der Kappen (3) zu erhöhen. Diese Kappen dienen ausschließlich zum äußeren Abschluß jedes Flachrohres (2). Sie werden, ebenso wie die Kappen (4), dicht in den Flachrohren (2) verlötet.7 to 9 make it clear that each cap (3) also consists of a shell-shaped part, the outwardly facing edges (20) of which are adapted to the inner cross section of the enlarged part (2a) of each flat tube (2). These cup-shaped caps (3) have stiffening beads (9) which run transversely to the longitudinal axis (10) of the oval shape and serve to increase the strength of the caps (3). These caps are used only for the outer end of each flat tube (2). Like the caps (4), they are soldered tightly in the flat tubes (2).

Claims (5)

1. A heat exchanger, particularly a coolant evaporator, consisting of a plurality of mutually parallel flat tubes which are in each case widened out at their ends and in relation to the middle part, their end faces being closed by caps, the end parts having apertures for connection to the neighbouring tube and being connected to the neighbouring tube, all the flat tubes (2) being the same and being provided with in each case two connecting apertures (5, 5') linking them to adjacent flat tubes, arid characterised in that a part (4) of the caps (3, 4) is provided with inwardly projecting wall parts (7) which seal off at least one of the connecting apertures (5).
2. A heat exchanger according to Claim 1, characterised in that the wall parts (7) belong to depressions (6) which are provided in shell-like caps (4).
3. A heat exchanger according to Claim 1, characterised in that the end parts (2a) of the flat tubes (2) have an oval cross-section and in that the caps (3) which are not provided with projections comprise stiffening beads (9) which extend transversely to the longitudinal axis (10) of the caps (3) which match the oval cross-section of the end parts of the flat tubes (2).
4. A heat exchanger according to Claim 1, characterised in that one of the connecting apertures (5) is provided with a union (110) projecting outwardly from its rim and of which the outside diameter corresponds to the inside diameter of the adjacent connecting apertures (5').
5. A heat exchanger according to Claim 4, characterised in that the union (110) has a length which corresponds substantially to the depth of the connecting aperture (5').
EP87109107A 1986-07-09 1987-06-24 Heat-exchanger, more particularly evaporator for refrigerant Expired EP0256259B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87109107T ATE47221T1 (en) 1986-07-09 1987-06-24 HEAT EXCHANGER, ESPECIALLY REFRIGERANT EVAPORATORS.

Applications Claiming Priority (2)

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DE19863622952 DE3622952A1 (en) 1986-07-09 1986-07-09 HEAT EXCHANGER, ESPECIALLY REFRIGERANT EVAPORATOR
DE3622952 1986-07-09

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EP0256259A1 EP0256259A1 (en) 1988-02-24
EP0256259B1 true EP0256259B1 (en) 1989-10-11

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ID=6304669

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EP87109107A Expired EP0256259B1 (en) 1986-07-09 1987-06-24 Heat-exchanger, more particularly evaporator for refrigerant

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US (1) US4775006A (en)
EP (1) EP0256259B1 (en)
JP (1) JPS6317390A (en)
AT (1) ATE47221T1 (en)
DE (2) DE3622952A1 (en)
ES (1) ES2011469B3 (en)

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Also Published As

Publication number Publication date
JPS6317390A (en) 1988-01-25
US4775006A (en) 1988-10-04
DE3760767D1 (en) 1989-11-16
EP0256259A1 (en) 1988-02-24
ATE47221T1 (en) 1989-10-15
ES2011469B3 (en) 1990-01-16
DE3622952A1 (en) 1988-01-21

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