EP1588115B1 - Heat exchanger, especially gas cooler - Google Patents

Heat exchanger, especially gas cooler Download PDF

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Publication number
EP1588115B1
EP1588115B1 EP03815365A EP03815365A EP1588115B1 EP 1588115 B1 EP1588115 B1 EP 1588115B1 EP 03815365 A EP03815365 A EP 03815365A EP 03815365 A EP03815365 A EP 03815365A EP 1588115 B1 EP1588115 B1 EP 1588115B1
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EP
European Patent Office
Prior art keywords
heat exchanger
longitudinal
collecting box
tongues
flat tube
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 - Lifetime
Application number
EP03815365A
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German (de)
French (fr)
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EP1588115A1 (en
Inventor
Uwe FÖRSTER
Kurt Molt
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Mahle Behr GmbH and Co KG
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Behr GmbH and Co KG
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Publication of EP1588115A1 publication Critical patent/EP1588115A1/en
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Classifications

    • 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
    • F28F9/0202—Header boxes having their inner space divided by partitions
    • F28F9/0204—Header boxes having their inner space divided by partitions for elongated header box, e.g. with transversal and longitudinal partitions
    • F28F9/0214—Header boxes having their inner space divided by partitions for elongated header box, e.g. with transversal and longitudinal partitions having only longitudinal partitions
    • 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
    • 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
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/0068—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for refrigerant cycles
    • F28D2021/0073—Gas coolers

Definitions

  • the invention relates to a heat exchanger, in particular a gas cooler for a CO2 refrigerant circuit of a motor vehicle air conditioning system, according to the preamble of claim 1.
  • Heat exchanger for air conditioners with R134a as refrigerant eg. B. capacitors consist of a heat transfer network with flat tubes and both sides of the network arranged collecting pipes with circular or other cross-section.
  • Other heat exchangers for air conditioning z. B. double-row evaporator after the DE-A 198 26 881 the applicant have a subdivided into two Lzanskammem collecting box, which is made of a prepared sheet metal blank by bending over the edge regions of the sheet metal blank. This gives a central, double-layered longitudinal partition, which is fixed by means of tongues in recesses of a flat header tank bottom.
  • each longitudinal chamber communicates with a row of flat tubes.
  • CO2 R744
  • a manifold consists of four juxtaposed circular flow channels. The production of such an extruded manifold is expensive because of the tools required for it.
  • the collection box is integrally formed and is bent from a sheet metal strip so that there are two longitudinal channels, however, - are different from this prior art - only with a flat tube row in fluid communication. Due to this design of the collecting tank, an approximately circular cross-section and thus a pressure-resistant collection box is made possible.
  • the two-ply longitudinal partition is fixed and anchored by means of tongues in a central region of the metal strip, which facilitates the manufacture and increases the strength.
  • the tongues for fixing the longitudinal dividing wall can be arranged either on the side facing the flat tubes or facing away. This increases the Krasmögtichkeiten the heat exchanger.
  • notches are arranged in the longitudinal partition wall in the region of the flat tube ends, which project into the longitudinal channels, in which engage the flat tube ends.
  • the flat tubes can be pushed into the collecting box relatively far - approximately to the middle - and formed with a maximum depth (the depth of the flat tube is measured in the direction of air flow).
  • the collection box is thus only insignificantly lower than that Flat tube. This can be advantageously created space for transformations or passages.
  • gaps are left between the notches and the flat tube ends, which may for example be U-shaped or arranged only laterally or above the flat tube. It is advantageous if the notches simultaneously serve as a stop for the flat tubes when they are pushed through the slot-shaped openings in the collection box. This results in a precise positioning of the flat tubes in the collecting box. Through the column to reach a pressure and flow compensation between the two adjacent longitudinal channels.
  • the region of the collecting tank, in which the recesses are arranged with the tongues slightly inwards, d. H. be retracted in the direction of the longitudinal partition, resulting in a certain "sidecut" for the cross section of the header. This ensures that the cross sections of the longitudinal channels even more, d. H. beyond a circumference of 270 degrees to a circular cross-section, which benefits the strength and weight.
  • Fig. 1 shows a section of a gas cooler 1 with a collecting box 2 and flat tubes 3, which open with their flat tube ends 3a in the collecting box 2 and are received in slot-shaped openings 4. Between the flat tubes 3 are - which is not shown - corrugated fins provided to increase the air side heat exchange surface.
  • the gas cooler 1 is particularly suitable for use in a refrigerant circuit with CO2 as the refrigerant of a motor vehicle air conditioning system, but not limited to this application.
  • the gas cooler is the primary side, ie flows through in the collecting tanks and the flat tubes of gaseous CO2 at a pressure of about 120 bar and the secondary side acted upon by ambient air; It has the task of cooling the CO2 gas from a temperature of approx. 150 degrees Celsius to 50 degrees Celsius. The resulting pressure is about ten times that of conventional condensers in a circuit with the refrigerant R134a.
  • Fig. 2 shows the gas cooler 1 according to Fig. 1 in a section, wherein it is clear that the collecting box 2 is integrally formed. He has two Lzanskammem 5, 6, which are separated by a double longitudinal partition 7 from each other.
  • the collection box 2 is made of a sheet metal plate or a sheet metal strip 8, which outer edge strips or longitudinal edges 9, 10, which are provided with tongues 11, 12. In the middle of the sheet metal tire 8, 12 recesses 13 are arranged according to the arrangement of the tongues 11 ,.
  • the collecting box 2 is made from the prepared, ie cut and punched sheet metal strip 8 in such a way that the sides with the longitudinal edges 9, 10 bent to approximately cylindrical channels 5, 6 and that the longitudinal edges 9, 10 centrally and approximately perpendicular to a central Connection region 14 are returned, where they are inserted with the tongues 11, 12 in the recesses 13.
  • the flat tubes 3 are inserted with their flat tube ends 3a in the openings 4 and protrude with its upper edge 3b about halfway in the free cross section of the longitudinal channels 5, 6 in. Since the cross section of the longitudinal channels 5, 6 here its has maximum width, resulting from the narrowing thereafter cross section, a stop for the flat tubes.
  • Fig. 3 shows a section through the gas cooler 1 in the plane III-III in Fig. 2
  • This section through the longitudinal channel 5 shows the partition 7, which has U-shaped notches 15 in the region of the flat tube ends 3a.
  • a gap 16 is left, which releases a flow cross-section between the two longitudinal channels 5, 6.
  • the refrigerant can also escape through this gap 16 in the middle of the flat tube ends 3a, and on the other hand, refrigerant can flow from one longitudinal channel 5 into the other longitudinal channel 6 and vice versa, so that pressure equalization can take place between the two longitudinal channels.
  • the notches 15 and the gap form 16 are given by way of example only - the shape of the gap can also be modified in such a way that only above the flat tube ends, ie above the upper edge 3b, there is a gap or only laterally of the flat tube ends 3a. In the latter case, the Flachrohroberkante 3b would abut the notch in the partition wall 7, which would result in a stop.
  • the tongues 11, 12 protrude beyond the outer wall of the collecting tank 2 and are each arranged approximately centrally between two flat tubes 3. However, it is also possible to skip one or more Flachrohrabments and to arrange the tongues 11, 12 and the recesses 13 at any intervals between two flat tubes.
  • Fig. 4 shows a further embodiment of a gas cooler 20 with a collecting box 21 and flat tubes 22.
  • tongues 23 and recesses 24 are here on the top of the collecting box 21, that is arranged on the flat tubes 22 side facing away.
  • Fig. 5 shows this gas cooler 20 in section.
  • the collecting box 21 is basically the same as in the embodiment according to Fig. 2 , but mirror-inverted.
  • the collecting box 21 has two longitudinal chambers 21a, 21b, which are divided by a double longitudinal partition wall 25 from each other.
  • the flat tubes 22 are inserted through a not visible here opening in the collecting box 21 so that they fill with their flat tube ends 22a about half of the longitudinal channels 21 a, 21 b.
  • the upper edge 22b is thus at the height of the maximum width of the inner cross sections.
  • the Flat tube 22. Skin has a continuous depth t, which extends into the collection box 21.
  • Fig. 6 shows a section in the plane VI-VI through the longitudinal channel 21a in Fig. 5 ,
  • the flat tubes 22 are inserted through corresponding openings 26 in the collection box 21, wherein the openings 26 extend over the full depth t of the flat tube 22.
  • approximately circular notches 27 are arranged, which transition into a rectangular cross section corresponding to the flat tube cross section and thus allow the insertion of the flat tube ends 22a.
  • an approximately circular gap 28 is left, which forms a passage cross section between the two longitudinal chambers 21a, 21b.
  • no gap is left.
  • the tongues 23 and also the not visible recesses here are each arranged between the flat tubes 22.
  • Fig. 7 shows a third embodiment of a gas cooler 30 with a collecting box 31 and flat tubes 32.
  • a double longitudinal partition wall 33 is anchored with tongues 34 in a central connecting portion 35, said connecting portion 35 is retracted slightly inward, ie by an amount x relative to a lower boundary line I of the header box 31 offset inwards.
  • the cross sections of the longitudinal channels 36, 37 are approximated to the circular shape beyond the three-quarter circle (270 degrees). Nevertheless, the offset middle connecting region 35 and the double longitudinal dividing wall 33 form a right angle. This cross-sectional shape thus offers a higher compressive strength for the collecting box 31.

Abstract

The heat exchanger has at least one manifold (2) divided into longitudinal channels and a row of flat pipes (3) with ends (3a) accommodated in openings (4) in the manifold and in fluidic connection with the channels. The manifold is made by bending from a prefabricated sheet strip with longitudinal edges with tongues and a central connecting region with cut-outs.

Description

Die Erfindung betrifft einen Wärmeübertrager, insbesondere einen Gaskühler für einen CO2-Kältmittelkreislauf einer Kraftfahrzeug-Klimaanlage, nach dem Oberbegriff des Patentanspruches 1.The invention relates to a heat exchanger, in particular a gas cooler for a CO2 refrigerant circuit of a motor vehicle air conditioning system, according to the preamble of claim 1.

Wärmeübertrager für Klimaanlagen mit R134a als Kältemittel, z. B. Kondensatoren bestehen aus einem Wärmeübertragemetz mit Flachrohren sowie beidseitig des Netzes angeordneten Sammelrohren mit kreisförmigen oder anderem Querschnitt. Andere Wärmeübertrager für Klimaanlagen, z. B. zweireihige Verdampfer nach der DE-A 198 26 881 der Anmelderin weisen einen in zwei Längskammem unterteilten Sammelkasten auf, der aus einer vorbereiteten Blechplatine durch Umbiegen der Randbereiche der Blechplatine hergestellt ist. Man erhält so eine mittige, doppellagige Längstrennwand, die mittels Zungen in Aussparungen eines ebenen Sammelkästenbodens fixiert ist. Im Boden sind zwei Reihen von Durchzügen für die beiden Flachrohrreihen angeordnet, das heißt jede Längskammer kommuniziert mit einer Flachrohrreihe. Mit dieser Bauweise wird bereits eine relativ hohe Druckfestigkeit erzielt. Bei modernen Klimaanlagen, die CO2 (R744) als Kältemittel verwenden, treten jedoch erheblich höhere Drücke auf, die ungefähr das Zehnfache betragen und die mit den herkömmlichen Bauweisen für Wärmeübertrager nicht mehr zu bewältigen sind. Man hat daher in der WO 98/51 983 extrudierte Sammelrohre mit einer erhöhten Wandstärke vorgeschlagen, wobei ein Sammelrohr aus vier nebeneinander angeordneten kreisförmigen Strömungskanälen besteht. Die Herstellung eines solchen extrudierten Sammelrohres ist wegen der dafür benötigten Werkzeuge kostenaufwendig.Heat exchanger for air conditioners with R134a as refrigerant, eg. B. capacitors consist of a heat transfer network with flat tubes and both sides of the network arranged collecting pipes with circular or other cross-section. Other heat exchangers for air conditioning, z. B. double-row evaporator after the DE-A 198 26 881 the applicant have a subdivided into two Längskammem collecting box, which is made of a prepared sheet metal blank by bending over the edge regions of the sheet metal blank. This gives a central, double-layered longitudinal partition, which is fixed by means of tongues in recesses of a flat header tank bottom. In the bottom two rows of passages for the two rows of flat tubes are arranged, that is, each longitudinal chamber communicates with a row of flat tubes. With this design, a relatively high compressive strength is already achieved. However, modern air conditioners that use CO2 (R744) as a refrigerant have significantly higher pressures, which are about tenfold, and are beyond the reach of traditional heat exchanger designs. One has therefore in the WO 98/51 983 extruded manifolds proposed with an increased wall thickness, wherein a manifold consists of four juxtaposed circular flow channels. The production of such an extruded manifold is expensive because of the tools required for it.

Ein anderer Typ von Sammelrohr wurde in der DE-A 199 06 289 vorgeschlagen, wobei ein Sammelrohr aus zwei oder drei extrudierten oder gepressten Teilen aufgebaut ist und zwei kreisförmige Strömungskanäle für das Kältemittel (CO2) aufweist. Auch bei dieser Bauweise muss wenigsten ein Teil des Sammelrohres durch Extrusion oder andere aufwendige Umformverfahren hergestellt werden, was sich ungünstig auf die Herstellkosten des Wärmeübertragers, wie beispielsweise Gaskühler, auswirkt.Another type of manifold was in the DE-A 199 06 289 proposed, wherein a manifold of two or three extruded or pressed parts is constructed and has two circular flow channels for the refrigerant (CO2). Even with this construction at least a part of the manifold must be prepared by extrusion or other complex forming process, which adversely affects the manufacturing costs of the heat exchanger, such as gas cooler.

Es ist daher Aufgabe der vorliegenden Erfindung, einen Wärmeübertrager der eingangs genannten Art dahingehend zu verbessern, dass der Sammelkasten eine hohe Festigkeit bei geringem Gewicht aufweist und kostengünstig herstellbar ist.It is therefore an object of the present invention to improve a heat exchanger of the type mentioned in that the collecting box has a high strength with low weight and is inexpensive to produce.

Diese Aufgabe wird durch die Merkmale des Patentanspruches 1 gelöst.This object is solved by the features of claim 1.

Wie an sich aus dem eingangs genannten Stand der Technik ( DE-A 198 26 881 ) bekannt, ist der Sammelkasten einteilig ausgebildet und wird aus einem Blechstreifen derart gebogen, dass sich zwei Längskanäle ergeben, die allerdings - abweichend von diesem Stand der Technik - nur mit einer Flachrohrreihe in Fluidverbindung stehen. Durch diese Bauweise des Sammelkastens wird ein annähernd kreisförmiger Querschnitt und damit ein druckfester Sammelkasten ermöglicht. Die doppellagige Längstrennwand ist mittels Zungen in einem mittleren Bereich des Blechstreifens fixiert und verankert, was die Fertigung erleichtert und die Festigkeit erhöht.As per se from the aforementioned prior art ( DE-A 198 26 881 ), the collection box is integrally formed and is bent from a sheet metal strip so that there are two longitudinal channels, however, - are different from this prior art - only with a flat tube row in fluid communication. Due to this design of the collecting tank, an approximately circular cross-section and thus a pressure-resistant collection box is made possible. The two-ply longitudinal partition is fixed and anchored by means of tongues in a central region of the metal strip, which facilitates the manufacture and increases the strength.

Nach einer vorteilhaften Weiterbildung der Erfindung können die Zungen zur Fixierung der Längstrennwand entweder auf der den Flachrohren zugewandten oder abgewandten Seite angeordnet sein. Dies erhöht die Gestaltungsmögtichkeiten des Wärmeübertragers.According to an advantageous development of the invention, the tongues for fixing the longitudinal dividing wall can be arranged either on the side facing the flat tubes or facing away. This increases the Gestaltungsmögtichkeiten the heat exchanger.

Nach einer vorteilhaften Weiterbildung der Erfindung sind in der Längstrennwand im Bereich der Flachrohrenden, welche in die Längskanäle hineinragen, Ausklinkungen angeordnet, in welche die Flachrohrenden eingreifen. Dadurch können die Flachrohre relativ weit - ungefähr bis zur Mitte - in den Sammelkasten hineingeschoben und mit einer maximalen Tiefe ausgebildet werden (die Tiefe des Flachrohres wird in Luftströmungsrichtung gemessen). Der Sammelkasten ist somit nur unwesentlich tiefer als das Flachrohr. Damit kann vorteilhaft Platz für Umformungen oder durchzüge geschaffen werden.According to an advantageous embodiment of the invention, notches are arranged in the longitudinal partition wall in the region of the flat tube ends, which project into the longitudinal channels, in which engage the flat tube ends. As a result, the flat tubes can be pushed into the collecting box relatively far - approximately to the middle - and formed with a maximum depth (the depth of the flat tube is measured in the direction of air flow). The collection box is thus only insignificantly lower than that Flat tube. This can be advantageously created space for transformations or passages.

In weiterer vorteilhafter Ausgestaltung der Erfindung sind zwischen den Ausklinkungen und den Flachrohrenden Spalte belassen, die beispielsweise U-förmig ausgebildet oder nur seitlich oder oberhalb des Flachrohres angeordnet sein können. Vorteilhaft ist dabei, wenn die Ausklinkungen gleichzeitig als Anschlag für die Flachrohre dienen, wenn diese durch die schlitzförmigen Öffnungen in den Sammelkasten hineingeschoben werden. Dadurch ergibt sich eine genaue Positionierung für die Flachrohre im Sammelkasten. Durch die Spalte erreicht man einen Druck- und Strömungsausgleich zwischen den beiden nebeneinander liegenden Längskanälen.In a further advantageous embodiment of the invention gaps are left between the notches and the flat tube ends, which may for example be U-shaped or arranged only laterally or above the flat tube. It is advantageous if the notches simultaneously serve as a stop for the flat tubes when they are pushed through the slot-shaped openings in the collection box. This results in a precise positioning of the flat tubes in the collecting box. Through the column to reach a pressure and flow compensation between the two adjacent longitudinal channels.

Nach einer weiteren vorteilhaften Ausgestaltung der Erfindung kann der Bereich des Sammelkastens, in dem die Aussparungen mit den Zungen angeordnet sind, etwas nach innen, d. h. in Richtung der Längstrennwand eingezogen werden, wodurch sich eine gewisse "Taillierung" für den Querschnitt des Sammelkastens ergibt. Damit wird erreicht, dass die Querschnitte der Längskanäle noch mehr, d. h. über 270 Grad Umfang hinaus an einen Kreisquerschnitt angenähert werden, was der Festigkeit und dem Gewicht zugute kommt.According to a further advantageous embodiment of the invention, the region of the collecting tank, in which the recesses are arranged with the tongues, slightly inwards, d. H. be retracted in the direction of the longitudinal partition, resulting in a certain "sidecut" for the cross section of the header. This ensures that the cross sections of the longitudinal channels even more, d. H. beyond a circumference of 270 degrees to a circular cross-section, which benefits the strength and weight.

Schließlich kann es auch vorteilhaft sein, die Querschnitte der beiden Längskanäle nicht gleich, sondern verschieden auszubilden, wobei auch die Lage der Trennwand außermittig, d. h. asymmetrisch sein kann. Wesentlich bei der Gestaltung des Sammelkastens ist, dass die Zungen etwa rechtwinklig zum Verbindungsstreifen mit den Aussparungen angeordnet sind, um eine optimale Zugankerwirkung zu erzielen.Finally, it may also be advantageous not the same, but different form the cross-sections of the two longitudinal channels, wherein the position of the partition off-center, d. H. can be asymmetric. Essential in the design of the collecting tank is that the tongues are arranged approximately at right angles to the connecting strip with the recesses, in order to achieve an optimal tie rod effect.

Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und werden im Folgenden näher beschrieben. Es zeigen

Fig. 1
eine perspektivische Teilansicht eines Gaskühlers,
Fig. 2
einen Schnitt durch den Gaskühler gemäß Fig. 1,
Fig. 3
einen Schnitt entlang der Linie III-III in Fig. 2,
Fig. 4
ein zweites Ausführungsbeispiel eines Gaskühlers,
Fig. 5
einen Schnitt durch den Gaskühler gemäß Fig. 4,
Fig. 6
einen Schnitt entlang der Linie VI-VI in Fig. 5,
Fig. 7
ein drittes Ausführungsbeispiel eines Gaskühlers im Schnitt.
Embodiments of the invention are illustrated in the drawings and will be described in more detail below. Show it
Fig. 1
a partial perspective view of a gas cooler,
Fig. 2
a section through the gas cooler according to Fig. 1 .
Fig. 3
a section along the line III-III in Fig. 2 .
Fig. 4
a second embodiment of a gas cooler,
Fig. 5
a section through the gas cooler according to Fig. 4 .
Fig. 6
a section along the line VI-VI in Fig. 5 .
Fig. 7
a third embodiment of a gas cooler in section.

Fig. 1 zeigt einen Ausschnitt eines Gaskühlers 1 mit einem Sammelkasten 2 und Flachrohren 3, die mit ihren Flachrohrenden 3a in den Sammelkasten 2 münden und in schlitzförmigen Öffnungen 4 aufgenommen sind. Zwischen den Flachrohren 3 sind - was nicht dargestellt ist - Wellrippen zur Vergrößerung der luftseitigen Wärmeaustauschfläche vorgesehen. Der Gaskühler 1 ist insbesondere zur Verwendung in einem Kältemittelkreislauf mit CO2 als Kältemittel einer Kraftfahrzeug-Klimaanlage geeignet, allerdings nicht auf diese Anwendung beschränkt. Der Gaskühler wird primärseitig, d. h. in den Sammelkästen und den Flachrohren von gasförmigem CO2 bei einem Druck von etwa 120 bar durchströmt und sekundärseitig von Umgebungsluft beaufschlagt; er hat die Aufgabe, das CO2-Gas von einer Temperatur von ca. 150 Grad Celsius auf 50 Grad Celsius abzukühlen. Der hierbei auftretende Druck beträgt etwa das Zehnfache gegenüber herkömmlichen Kondensatoren in einem Kreislauf mit dem Kältemittel R134a. Fig. 1 shows a section of a gas cooler 1 with a collecting box 2 and flat tubes 3, which open with their flat tube ends 3a in the collecting box 2 and are received in slot-shaped openings 4. Between the flat tubes 3 are - which is not shown - corrugated fins provided to increase the air side heat exchange surface. The gas cooler 1 is particularly suitable for use in a refrigerant circuit with CO2 as the refrigerant of a motor vehicle air conditioning system, but not limited to this application. The gas cooler is the primary side, ie flows through in the collecting tanks and the flat tubes of gaseous CO2 at a pressure of about 120 bar and the secondary side acted upon by ambient air; It has the task of cooling the CO2 gas from a temperature of approx. 150 degrees Celsius to 50 degrees Celsius. The resulting pressure is about ten times that of conventional condensers in a circuit with the refrigerant R134a.

Fig. 2 zeigt den Gaskühler 1 gemäß Fig. 1 in einem Schnitt, wobei deutlich wird, dass der Sammelkasten 2 einstückig ausgebildet ist. Er weist zwei Längskammem 5, 6 auf, die durch eine doppelte Längstrennwand 7 voneinander abgeteilt sind. Der Sammelkasten 2 ist aus einer Blechplatine bzw. einem Blechstreifen 8 hergestellt, welcher äußere Randstreifen bzw. Längsränder 9, 10 aufweist, die mit Zungen 11, 12 versehen sind. In der Mitte des Blechsreifens 8 sind, entsprechend der Anordnung der Zungen 11, 12 Aussparungen 13 angeordnet. Fig. 2 shows the gas cooler 1 according to Fig. 1 in a section, wherein it is clear that the collecting box 2 is integrally formed. He has two Längskammem 5, 6, which are separated by a double longitudinal partition 7 from each other. The collection box 2 is made of a sheet metal plate or a sheet metal strip 8, which outer edge strips or longitudinal edges 9, 10, which are provided with tongues 11, 12. In the middle of the sheet metal tire 8, 12 recesses 13 are arranged according to the arrangement of the tongues 11 ,.

Der Sammelkasten 2 wird aus dem vorbereiteten, d. h. zugeschnittenen und ausgestanzten Blechstreifen 8 in der Weise hergestellt, dass die Seiten mit den Längsrändern 9, 10 zu etwa zylinderförmigen Kanälen 5, 6 umgebogen und dass die Längsränder 9, 10 mittig und etwa senkrecht auf einen mittleren Verbindungsbereich 14 zurückgeführt werden, wo sie mit den Zungen 11, 12 in die Aussparungen 13 gesteckt werden. Damit sind die Längsränder 9, 10 fixiert, und der Sammelkasten 2 ist fertig für den Lötprozess. Die Flachrohre 3 sind mit ihren Flachrohrenden 3a in die Öffnungen 4 gesteckt und ragen mit ihrer Oberkante 3b etwa zur Hälfte in den freien Querschnitt der Längskanäle 5, 6 hinein. Da der Querschnitt der Längskanäle 5, 6 hier seine maximale Breite hat, ergibt sich durch den sich danach verengenden Querschnitt ein Anschlag für die Flachrohre 3.The collecting box 2 is made from the prepared, ie cut and punched sheet metal strip 8 in such a way that the sides with the longitudinal edges 9, 10 bent to approximately cylindrical channels 5, 6 and that the longitudinal edges 9, 10 centrally and approximately perpendicular to a central Connection region 14 are returned, where they are inserted with the tongues 11, 12 in the recesses 13. Thus, the longitudinal edges 9, 10 are fixed, and the collecting box 2 is ready for the soldering process. The flat tubes 3 are inserted with their flat tube ends 3a in the openings 4 and protrude with its upper edge 3b about halfway in the free cross section of the longitudinal channels 5, 6 in. Since the cross section of the longitudinal channels 5, 6 here its has maximum width, resulting from the narrowing thereafter cross section, a stop for the flat tubes. 3

Fig. 3 zeigt einen Schnitt durch den Gaskühler 1 in der Ebene III-III in Fig. 2. Dieser Schnitt durch den Längskanal 5 zeigt die Trennwand 7, welche U-förmige Ausklinkungen 15 im Bereich der Flachrohrenden 3a aufweist. Zwischen der Kontur der Flachrohrenden 3a und der Kontur der Ausklinkung 15 ist ein Spalt 16 belassen, der einen Durchströmungsquerschnitt zwischen den beiden Längskanälen 5, 6 freigibt. Durch diesen Spalt 16 kann einerseits das Kältemittel auch in der Mitte der Flachrohrenden 3a austreten, und andererseits kann Kältemittel von einem Längskanal 5 in den anderen Längskanal 6 und umgekehrt strömen, sodass zwischen beiden Längskanälen ein Druckausgleich stattfinden kann. Die Ausklinkungen 15 bzw. die Spaltform 16 sind der Zeichnung nur beispielhaft angegeben - die Form des Spaltes kann auch in der Weise abgeändert werden, dass sich nur oberhalb der Flachrohrenden, d. h. oberhalb der Oberkante 3b ein Spalt befindet oder nur seitlich der Flachrohrenden 3a. In letzterem Falle würde die Flachrohroberkante 3b an die Ausklinkung in der Trennwand 7 anstoßen, wodurch sich ein Anschlag ergäbe. Die Zungen 11, 12 stehen über die Außenwand des Sammelkastens 2 hervor und sind jeweils etwa mittig zwischen zwei Flachrohren 3 angeordnet. Es ist jedoch auch möglich, ein oder mehrere Flachrohrabstände zu überspringen und die Zungen 11, 12 und die Aussparungen 13 in beliebigen Abständen jeweils zwischen zwei Flachrohren anzuordnen. Fig. 3 shows a section through the gas cooler 1 in the plane III-III in Fig. 2 , This section through the longitudinal channel 5 shows the partition 7, which has U-shaped notches 15 in the region of the flat tube ends 3a. Between the contour of the flat tube ends 3a and the contour of the notch 15, a gap 16 is left, which releases a flow cross-section between the two longitudinal channels 5, 6. On the one hand, the refrigerant can also escape through this gap 16 in the middle of the flat tube ends 3a, and on the other hand, refrigerant can flow from one longitudinal channel 5 into the other longitudinal channel 6 and vice versa, so that pressure equalization can take place between the two longitudinal channels. The notches 15 and the gap form 16 are given by way of example only - the shape of the gap can also be modified in such a way that only above the flat tube ends, ie above the upper edge 3b, there is a gap or only laterally of the flat tube ends 3a. In the latter case, the Flachrohroberkante 3b would abut the notch in the partition wall 7, which would result in a stop. The tongues 11, 12 protrude beyond the outer wall of the collecting tank 2 and are each arranged approximately centrally between two flat tubes 3. However, it is also possible to skip one or more Flachrohrabstände and to arrange the tongues 11, 12 and the recesses 13 at any intervals between two flat tubes.

Fig. 4 zeigt ein weiteres Ausführungsbeispiels eines Gaskühlers 20 mit einem Sammelkasten 21 und Flachrohren 22. Zungen 23 und Aussparungen 24 sind hier auf der Oberseite des Sammelkasten 21, d. h. auf der den Flachrohren 22 abgewandten Seite angeordnet. Fig. 4 shows a further embodiment of a gas cooler 20 with a collecting box 21 and flat tubes 22. tongues 23 and recesses 24 are here on the top of the collecting box 21, that is arranged on the flat tubes 22 side facing away.

Fig. 5 zeigt diesen Gaskühler 20 im Schnitt. Der Sammelkasten 21 ist prinzipiell gleich wie beim Ausführungsbeispiel gemäß Fig. 2, jedoch spiegelbildlich ausgebildet. Der Sammelkasten 21 weist zwei Längskammern 21a, 21b auf, die durch eine doppelte Längstrennwand 25 voneinander abgeteilt sind. Die Flachrohre 22 werden durch eine hier nicht sichtbare Öffnung in den Sammelkasten 21 eingeschoben, sodass sie mit ihren Flachrohrenden 22a etwa die Hälfte der Längskanäle 21 a, 21 b ausfüllen. Die Oberkante 22b liegt damit auf der Höhe der maximalen Breite der Innenquerschnitte. Das Flachrohr 22. haut eine durchgehend Tiefe t, die sich bis in den Sammelkasten 21 erstreckt. Fig. 5 shows this gas cooler 20 in section. The collecting box 21 is basically the same as in the embodiment according to Fig. 2 , but mirror-inverted. The collecting box 21 has two longitudinal chambers 21a, 21b, which are divided by a double longitudinal partition wall 25 from each other. The flat tubes 22 are inserted through a not visible here opening in the collecting box 21 so that they fill with their flat tube ends 22a about half of the longitudinal channels 21 a, 21 b. The upper edge 22b is thus at the height of the maximum width of the inner cross sections. The Flat tube 22. Skin has a continuous depth t, which extends into the collection box 21.

Fig. 6 zeigt einen Schnitt in der Ebene VI-VI durch den Längskanal 21a in Fig. 5. Die Flachrohre 22 sind durch entsprechende Öffnungen 26 im Sammelkasten 21 eingesetzt, wobei sich die Öffnungen 26 über die volle Tiefe t des Flachrohres 22 erstrecken. Oberhalb der Oberkante 22b der Flachrohrenden 22a sind etwa kreisförmige Ausklinkungen 27 angeordnet, die in einen rechteckigen Querschnitt entsprechend dem Flachrohrquerschnitt übergehen und somit das Einführen der Flachrohrenden 22a erlauben. Oberhalb der Oberkante 22b der Flachrohrenden 22a ist ein etwa kreisförmiger Spalt 28 belassen, der einen Durchtrittsquerschnitt zwischen den beiden Längskammem 21a, 21b bildet. Unmittelbar neben den Flachrohrenden 22a ist kein Spalt belassen. Die Zungen 23 und ebenso die hier nicht sichtbaren Aussparungen sind auch hier jeweils zwischen den Flachrohren 22 angeordnet. Fig. 6 shows a section in the plane VI-VI through the longitudinal channel 21a in Fig. 5 , The flat tubes 22 are inserted through corresponding openings 26 in the collection box 21, wherein the openings 26 extend over the full depth t of the flat tube 22. Above the upper edge 22b of the flat tube ends 22a approximately circular notches 27 are arranged, which transition into a rectangular cross section corresponding to the flat tube cross section and thus allow the insertion of the flat tube ends 22a. Above the upper edge 22b of the flat tube ends 22a, an approximately circular gap 28 is left, which forms a passage cross section between the two longitudinal chambers 21a, 21b. Immediately adjacent the flat tube ends 22a, no gap is left. The tongues 23 and also the not visible recesses here are each arranged between the flat tubes 22.

Fig. 7 zeigt ein drittes Ausführungsbeispiel für einen Gaskühler 30 mit einem Sammelkasten 31 und Flachrohren 32. Eine doppelte Längstrennwand 33 ist mit Zungen 34 in einem mittleren Verbindungsbereich 35 verankert, wobei dieser Verbindungsbereich 35 etwas nach innen eingezogen ist, d. h. um einen Betrag x gegenüber einer unteren Begrenzungslinie I des Sammelkastens 31 nach innen versetzt. Dadurch werden die Querschnitte der Längskanäle 36, 37 über den Dreiviertel-Kreis (270 Grad) hinaus der Kreisform angenähert. Dennoch bilden der abgesetzte mittlere Verbindungsbereich 35 und die doppelte Längstrennwand 33 einen rechten Winkel. Diese Querschnittsform bietet somit eine höhere Druckfestigkeit für den Sammelkasten 31. Fig. 7 shows a third embodiment of a gas cooler 30 with a collecting box 31 and flat tubes 32. A double longitudinal partition wall 33 is anchored with tongues 34 in a central connecting portion 35, said connecting portion 35 is retracted slightly inward, ie by an amount x relative to a lower boundary line I of the header box 31 offset inwards. As a result, the cross sections of the longitudinal channels 36, 37 are approximated to the circular shape beyond the three-quarter circle (270 degrees). Nevertheless, the offset middle connecting region 35 and the double longitudinal dividing wall 33 form a right angle. This cross-sectional shape thus offers a higher compressive strength for the collecting box 31.

Alle oben beschriebenen Ausführungsbeispiele sind für hohe Innendrücke und damit auch für einen mit CO2 betriebenen Kättemittelkreislauf einer Kraftfahrzeug-Klimaanlage geeignet und vorteilhaft.All of the embodiments described above are suitable and advantageous for high internal pressures and thus also for a refrigerant circuit operated by means of a motor vehicle air conditioning system.

Bezugszahlenreference numerals

11
Gaskühlergas cooler
22
Sammelkastencollection box
33
Flachrohrflat tube
44
Öffnungopening
55
Längskanallongitudinal channel
66
LänskammerLänskammer
77
LängstrennwandLongitudinal partition
88th
Blechstreifenmetal strip
99
Längsrandlongitudinal edge
1010
Längsrandlongitudinal edge
1111
Zungetongue
1212
Zungetongue
1313
Aussparungrecess
1414
mittlerer Verbindungsbereichmiddle connection area
1515
Ausklinkung, U-förmigNotch, U-shaped
1616
Spaltgap
1717
Spaltgap
2020
Gaskühlergas cooler
2121
Sammelkastencollection box
21a21a
Längskammerlongitudinal chamber
21b21b
Längskammerlongitudinal chamber
2222
Flachrohreflat tubes
2323
Zungetongue
2424
Aussparungrecess
2525
LängstrennwandLongitudinal partition
2626
Öffnungopening
2727
Ausklinkungnotch
2828
Spaltgap
3030
Gaskühlergas cooler
3131
Sammelkastencollection box
3232
Flachrohrflat tube
3333
LängstrennwandLongitudinal partition
3434
Zungentongues
3535
mittlerer Verbindungsbereichmiddle connection area
3636
Längskanallongitudinal channel
3737
Längskanallongitudinal channel
3838
Spaltgap

Claims (14)

  1. A heat exchanger, especially gas cooler for a CO2 coolant circuit of a motor vehicle air conditioning system, having at least one collecting box (2) which is divided into two longitudinal ducts (5, 6) by a longitudinal dividing wall (7), and a series of flat tubes (3) with flat tube ends (3a) which are accommodated in openings (4) in the collecting box (2), and are fluidically connected to the longitudinal ducts (5, 6), wherein the collecting box (2) with the longitudinal ducts (5, 6) is bent from a prepared sheet metal strip (8) with longitudinal edges (9, 10) having tongues (11, 12) and a central connecting region (14) having cutouts (13), the longitudinal edges (9, 10) forming the longitudinal dividing wall (7) and being anchored in the cutouts (13) via the tongues (11, 12).
  2. The heat exchanger as claimed in claim 1, wherein the tongues (11, 12) and cutouts (13) are arranged on the side of the collecting box (2) facing the flat tubes (3).
  3. The heat exchanger as claimed in claim 1, wherein the tongues (23) and the cutouts (24) are arranged on the side of the collecting box (21) facing away from the flat tubes (22).
  4. The heat exchanger as claimed in claim 1, 2 or 3, wherein the longitudinal dividing wall (7, 25) has notches (15, 27) in which the flat tube ends (3a, 22a) engage.
  5. The heat exchanger as claimed in one of the preceding claims, wherein the collecting box or parts of the collecting box are provided with corresponding shaped portions, integrally formed-on portions and/or beads which serve as stops for the tubes.
  6. The heat exchanger as claimed in claim 4 or 5, wherein gaps (16, 28) are left between the notches (15, 27) and the flat tube ends (3a, 22a).
  7. The heat exchanger as claimed in claim 6, wherein the gaps (16) are formed in a U shape.
  8. The heat exchanger as claimed in claim 6, wherein the gaps are arranged laterally and the notches form a stop for the tube ends.
  9. The heat exchanger as claimed in claim 6, wherein gaps (28) are arranged above and/or below the flat tube ends (22a, 22b).
  10. The heat exchanger as claimed in one of claims 1 to 9, wherein the tongues (11, 12; 23) and cutouts (13, 24) are arranged between the n-th flat tube (3, 22), where n = 1, 2, 3, 4, 5, ....
  11. The heat exchanger as claimed in one of claims 1 to 10, wherein the cross sections of the longitudinal ducts (5, 6; 23, 24; 36, 37) are of approximately circular design, in particular over a circumferential range of at least 270 degrees.
  12. The heat exchanger as claimed in claim 11, wherein the central connecting region (35) which accommodates the tongues (34) is stepped back in the direction of the longitudinal dividing wall (33) by an amount x and is curved toward the outside.
  13. The heat exchanger as claimed in one of the preceding claims, wherein the cross sections of the longitudinal ducts are different in shape and/or size.
  14. The heat exchanger as claimed in one of the preceding claims, wherein the longitudinal dividing wall has at least one opening or notch or overflow opening.
EP03815365A 2003-01-21 2003-11-07 Heat exchanger, especially gas cooler Expired - Lifetime EP1588115B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10302412 2003-01-21
DE10302412A DE10302412A1 (en) 2003-01-21 2003-01-21 Heat exchanger, especially gas cooler for coolant circuit for vehicle air conditioning system, has manifold bent from a prefabricated strip with edges with tongues, central region with cut-outs
PCT/EP2003/012467 WO2004065882A1 (en) 2003-01-21 2003-11-07 Heat exchanger, especially gas cooler

Publications (2)

Publication Number Publication Date
EP1588115A1 EP1588115A1 (en) 2005-10-26
EP1588115B1 true EP1588115B1 (en) 2009-09-09

Family

ID=32602865

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03815365A Expired - Lifetime EP1588115B1 (en) 2003-01-21 2003-11-07 Heat exchanger, especially gas cooler

Country Status (9)

Country Link
US (1) US20060054313A1 (en)
EP (1) EP1588115B1 (en)
JP (1) JP2006513392A (en)
CN (1) CN100573021C (en)
AT (1) ATE442565T1 (en)
AU (1) AU2003303762A1 (en)
BR (1) BR0318023A (en)
DE (2) DE10302412A1 (en)
WO (1) WO2004065882A1 (en)

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EP2107328B1 (en) * 2008-04-02 2012-07-11 Behr GmbH & Co. KG Vaporiser
DE102008035358A1 (en) 2008-07-29 2010-02-04 Modine Manufacturing Co., Racine Heat exchanger with manifold and manifold and manufacturing process for it
DE102009013280A1 (en) 2009-03-14 2010-09-16 Modine Manufacturing Co., Racine Heat exchanger e.g. condenser, for use in e.g. carbon dioxide air conditioning system, has extension attachments tapered in cross section, where tapered section of extension attachments extends through openings in bottom of base part
DE102009023954A1 (en) * 2009-06-04 2010-12-09 Behr Gmbh & Co. Kg Collecting tube for a condenser
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CN101995116B (en) * 2009-08-20 2014-07-30 贝洱两合公司 Evaporator
CN103486774A (en) * 2013-09-24 2014-01-01 浙江基力思汽车空调有限公司 Roll-pressing collecting pipe parallel flow evaporator
CN107255373A (en) * 2016-12-19 2017-10-17 浙江银轮机械股份有限公司 A kind of air-conditioning equipment heat exchanger and its current collector
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Also Published As

Publication number Publication date
CN100573021C (en) 2009-12-23
DE10302412A1 (en) 2004-07-29
US20060054313A1 (en) 2006-03-16
WO2004065882A1 (en) 2004-08-05
EP1588115A1 (en) 2005-10-26
JP2006513392A (en) 2006-04-20
BR0318023A (en) 2005-12-06
ATE442565T1 (en) 2009-09-15
AU2003303762A1 (en) 2004-08-13
DE50311904D1 (en) 2009-10-22
CN1738999A (en) 2006-02-22

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