EP1588115A1 - Heat exchanger, especially gas cooler - Google Patents

Heat exchanger, especially gas cooler

Info

Publication number
EP1588115A1
EP1588115A1 EP03815365A EP03815365A EP1588115A1 EP 1588115 A1 EP1588115 A1 EP 1588115A1 EP 03815365 A EP03815365 A EP 03815365A EP 03815365 A EP03815365 A EP 03815365A EP 1588115 A1 EP1588115 A1 EP 1588115A1
Authority
EP
European Patent Office
Prior art keywords
heat exchanger
longitudinal
exchanger according
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.)
Granted
Application number
EP03815365A
Other languages
German (de)
French (fr)
Other versions
EP1588115B1 (en
Inventor
Uwe FÖRSTER
Kurt Molt
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
Original Assignee
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
Publication of EP1588115A1 publication Critical patent/EP1588115A1/en
Application granted granted Critical
Publication of EP1588115B1 publication Critical patent/EP1588115B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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

  • Heat exchangers especially gas coolers
  • the invention relates to a heat exchanger, in particular a gas cooler for a CO 2 refrigerant circuit of a motor vehicle air conditioning system, according to the preamble of patent claim 1.
  • Heat exchangers for air conditioning systems with R134a as refrigerant e.g. B. capacitors consist of a heat exchanger network with flat tubes and collecting tubes arranged on both sides of the network with a circular or other cross-section.
  • Other heat exchangers for air conditioning systems e.g. B. two-row evaporators according to DE-A 198 26 881 of the applicant have a collection box divided into two longitudinal chambers, which is made from a prepared bending plate by bending the edge regions of the sheet metal plate. In this way, a central, double-layered longitudinal partition wall is obtained, which is fixed by means of tongues in recesses in a flat collecting box floor. Two rows of passages are arranged in the floor for the two rows of flat tubes, i.e.
  • each longitudinal chamber communicates with one row of flat tubes.
  • a relatively high compressive strength wedge is already achieved.
  • C02 R744
  • considerably higher pressures occur, which are approximately ten times higher and which are no longer manageable with the conventional designs for heat exchangers. It has therefore been proposed in WO 98/51 983 to have extruded manifolds with an increased wall thickness, a manifold consisting of four circular flow channels arranged next to one another. The production of such an extruded manifold is costly because of the tools required for it.
  • header pipe Another type of header pipe has been proposed in DE-A 199 06 289, a header pipe being constructed from two or three extruded or pressed parts and having two circular flow channels for the refrigerant (CO 2). With this construction too, at least part of the header pipe has to be produced by extrusion or other complex forming processes, which has an unfavorable effect on the production costs of the heat exchanger, such as gas coolers.
  • the collecting tank is formed in one piece and is bent from a sheet metal strip in such a manner, two longitudinal channels däss result ', which however - in contrast to this prior art - only be in fluid communication with a row of flat tubes.
  • This construction of the collection box enables an approximately circular cross section and thus a pressure-resistant collection box.
  • the double-layered longitudinal partition is fixed and anchored by means of tongues in a central area of the sheet metal strip, which simplifies production and increases strength.
  • the tongues for fixing the longitudinal partition can either be arranged on the side facing the flat tubes or facing away. This increases the design options of the heat exchanger.
  • the flat-tube ends which project into the longitudinal channels, notches are arranged in the longitudinal dividing wall in the region, in which engage the flat tube ends.
  • the flat tubes can be pushed relatively far - approximately to the middle - into the collecting box and can be designed with a maximum depth (the depth of the flat tube is measured in the direction of air flow).
  • the collection box is therefore only slightly deeper than that Flat tube. In this way, space can advantageously be created for reshaping or drawing.
  • gaps are left between the notches and the flat tube ends, which, for example, are U-shaped or can be arranged only laterally or above the flat tube. It is advantageous if the notches also serve as a stop for the flat tubes when they are pushed into the collecting box through the slot-shaped openings. This results in an exact positioning for the flat tubes in the collecting box. A pressure and flow compensation between the two adjacent longitudinal channels is achieved through the column.
  • the area of the collecting box in which the recesses with the tongues are arranged can be slightly inward, ie. H. in the direction of the longitudinal partition. be pulled, which results in a certain "waist" for the cross section of the header tank. This ensures that the cross sections of the longitudinal channels are more or less approximated to a circular cross section beyond a circumference of 270 degrees, which benefits the strength and the weight.
  • the cross sections of the two longitudinal channels can also be advantageous to design the cross sections of the two longitudinal channels not differently, but differently, the position of the partition wall also being off-center, i. H. can be asymmetrical. It is essential in the design of the collecting box that the tongues are arranged approximately at right angles to the connecting strip with the cutouts in order to achieve an optimal tie rod effect.
  • FIG. 1 is a partial perspective view of a gas cooler
  • FIG. 2 shows a section through the gas cooler according to FIG. 1
  • FIG. 3 shows a section along the line III-III in FIG. 2
  • FIG. 5 shows a section through the gas cooler according to FIG. 4
  • Fig. 6 shows a section along the line VI-VI in Fig. 5 ,.
  • Fig. 7 shows a third embodiment of a gas cooler in section.
  • Fig. 1 shows a section of a gas cooler 1 with a header box 2 and flat tubes 3, which open with their flat tube ends 3a in the header box 2 and are received in slot-shaped openings 4. Between the flat tubes 3 - which is not shown - corrugated fins are provided to enlarge the air-side heat exchange surface.
  • the gas cooler 1 is particularly suitable for use in a refrigerant circuit with CO 2 as the refrigerant of a motor vehicle air conditioning system, but is not restricted to this application.
  • the gas cooler is on the primary side, i.e. H.
  • FIG. 2 shows the gas cooler 1 according to FIG. 1 in a section, it becoming clear that the collecting tank 2 is made in one piece. It has two longitudinal chambers 5, 6, which are separated from one another by a double longitudinal partition 7.
  • the collecting box 2 is made of a sheet metal plate or a sheet metal strip 8 which has outer edge strips or longitudinal edges 9, 10 which are provided with tongues 11, 12. In the middle of the sheet metal tire 8, 13 are arranged in accordance with the arrangement of the tongues 11, 12.
  • 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 are bent into approximately cylindrical channels 5, 6 and that the longitudinal edges 9, 10 are centered and approximately perpendicular to a central one Connection area 14 are returned where they are inserted into the recesses 13 with the tongues 11, 12.
  • the longitudinal edges 9, 10 are thus fixed, and the collecting box 2 is ready for the soldering process.
  • the flat tube ends 3a are inserted into the openings 4 with their flat tube ends 3a and protrude approximately halfway into the free cross section of the longitudinal channels 5, 6 with their upper edge 3b. Since the cross section of the longitudinal channels 5, 6 here has a maximum width, the cross section which then narrows results in a stop for the flat tubes 3.
  • 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 between the contour of the flat tube ends 3a and the contour of the notch 15, which opens a flow cross-section between the two longitudinal channels 5, 6.
  • the refrigerant can 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 shape 16 are only given by way of example in the drawing - the shape of the gap can also be modified in such a way that only above the flat tube ends, ie. H. There is a gap above the upper edge 3b or only to the side of the flat tube ends 3a. In the latter case, the flat tube upper edge 3b would abut the notch in the partition 7, which would result in a stop.
  • the tongues 11, 12 protrude from the outer wall of the collecting tank 2 and are each arranged approximately in the middle between two flat tubes 3. However, it is also possible to skip one or more flat tube spacings and to arrange the tongues 11, 12 and the cutouts 13 at any spacing between two flat tubes.
  • FIG. 4 shows a further exemplary 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, i. H. arranged on the side facing away from the flat tubes 22.
  • Fig. 5 shows this gas cooler 20 in section.
  • the collecting box 21 is in principle the same as in the exemplary embodiment according to FIG. 2, but is a mirror image.
  • the collecting box 21 has two longitudinal chambers 21a, 21b which are separated from one another by a double longitudinal partition wall 25.
  • the flat tubes 22 are inserted into the collecting box 21 through an opening that is not visible here, so that they fill about half of the longitudinal channels 21a, 21b with their flat tube ends 22a.
  • the upper edge 22b is thus at the height of the maximum width of the inner cross sections.
  • the Flat tube 22 has a continuous depth t which extends into the collecting 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 collecting box 21, the openings 26 extending over the full depth t of the flat tube 22.
  • Approximately circular notches 27 are arranged above the upper edge 22b of the flat tube ends 22a, which pass 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, 21. No gap is left immediately next to the flat tube ends 22a.
  • the tongues 23 and also the recesses which are not visible here are also arranged here between the flat tubes 22.
  • FIG. 7 shows a third exemplary 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 area 35, this connecting area 35 being slightly retracted after them, i. H. offset inward by an amount x with respect to a lower boundary line I of the collecting tank 31.
  • the cross sections of the long channels 36, 37 are approximated to the circular shape beyond the three-quarter circle (270 degrees). Nevertheless, the offset central connection area 35 and the double longitudinal partition 33 form a right angle. This cross-sectional shape thus offers a higher compressive strength for the collecting tank 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

Wärmeübertrager, insbesondere Gaskühler Heat exchangers, especially gas coolers
Die Erfindung betrifft einen Wärmeübertrager, insbesondere einen Gaskühler für einen C02-Kältmittelkreislauf einer Kraftfahrzeug-Klimaanlage, nach dem Oberbegriff des Patentanspruches 1.The invention relates to a heat exchanger, in particular a gas cooler for a CO 2 refrigerant circuit of a motor vehicle air conditioning system, according to the preamble of patent claim 1.
Wärmeübertrager für Klimaanlagen mit R134a als Kältemittel, z. B. Kondensatoren bestehen aus einem Wärmeübertragernetz 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 Längskammern unterteilten Sammelkasten auf, der aus einer vorbereiteten Biechplatine durch Umbiegen der Randbereiche der Blechplatine hergestellt ist. Man erhält so eine mittige, doppellagige Längstrennwand, die mittels Zungen in Aussparungen eines ebenen Sammelkastenbo- dens 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 Druckfestigkeil erzielt. Bei modernen Klimaanlagen, die C02 (R744) als Kältemittel verwenden, treten jedoch erheblich höhere Drücke auf, die un- gefähr 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 Strömungskanäien besteht. Die Herstellung eines solchen ex- trudierten Sammelrohres ist wegen der dafür benötigten Werkzeuge kostenaufwendig. Ein anderer Typ von Sammelrohr wurde in der DE-A 199 06 289 vorgeschlagen, wobei ein Sammelrohr aus zwei oder drei extrudierten oder ge- pressten Teilen aufgebaut ist und zwei kreisförmige Strömungskanäle für das Kältemittel (C02) 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.Heat exchangers for air conditioning systems with R134a as refrigerant, e.g. B. capacitors consist of a heat exchanger network with flat tubes and collecting tubes arranged on both sides of the network with a circular or other cross-section. Other heat exchangers for air conditioning systems, e.g. B. two-row evaporators according to DE-A 198 26 881 of the applicant have a collection box divided into two longitudinal chambers, which is made from a prepared bending plate by bending the edge regions of the sheet metal plate. In this way, a central, double-layered longitudinal partition wall is obtained, which is fixed by means of tongues in recesses in a flat collecting box floor. Two rows of passages are arranged in the floor for the two rows of flat tubes, i.e. each longitudinal chamber communicates with one row of flat tubes. With this design, a relatively high compressive strength wedge is already achieved. In modern air conditioning systems that use C02 (R744) as a refrigerant, however, considerably higher pressures occur, which are approximately ten times higher and which are no longer manageable with the conventional designs for heat exchangers. It has therefore been proposed in WO 98/51 983 to have extruded manifolds with an increased wall thickness, a manifold consisting of four circular flow channels arranged next to one another. The production of such an extruded manifold is costly because of the tools required for it. Another type of header pipe has been proposed in DE-A 199 06 289, a header pipe being constructed from two or three extruded or pressed parts and having two circular flow channels for the refrigerant (CO 2). With this construction too, at least part of the header pipe has to be produced by extrusion or other complex forming processes, which has an unfavorable effect on the production costs of the heat exchanger, such as gas coolers.
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 at the outset in such a way that the header tank has high strength and low weight. has and is inexpensive to manufacture.
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, däss sich zwei Längskanäle ergeben', die allerdings - abweichend von diesem Stand der Technik - nur mit einer Flach- rohrreihe 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 is known per se from the aforementioned prior art (DE-A 198 26 881), the collecting tank is formed in one piece and is bent from a sheet metal strip in such a manner, two longitudinal channels däss result ', which however - in contrast to this prior art - only be in fluid communication with a row of flat tubes. This construction of the collection box enables an approximately circular cross section and thus a pressure-resistant collection box. The double-layered longitudinal partition is fixed and anchored by means of tongues in a central area of the sheet metal strip, which simplifies production and increases 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 Gestaltungsmöglichkeiten des Wärmeübertragers.According to an advantageous development of the invention, the tongues for fixing the longitudinal partition can either be arranged on the side facing the flat tubes or facing away. This increases the design options of 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 durchzöge geschaffen werden.According to an advantageous' of the invention, the flat-tube ends which project into the longitudinal channels, notches are arranged in the longitudinal dividing wall in the region, in which engage the flat tube ends. As a result, the flat tubes can be pushed relatively far - approximately to the middle - into the collecting box and can be designed with a maximum depth (the depth of the flat tube is measured in the direction of air flow). The collection box is therefore only slightly deeper than that Flat tube. In this way, space can advantageously be created for reshaping or drawing.
In weiterer vorteilhafter Ausgestaltung der Erfindung sind zwischen den Aüsklinkungen 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, for example, are U-shaped or can be arranged only laterally or above the flat tube. It is advantageous if the notches also serve as a stop for the flat tubes when they are pushed into the collecting box through the slot-shaped openings. This results in an exact positioning for the flat tubes in the collecting box. A pressure and flow compensation between the two adjacent longitudinal channels is achieved through the column.
Nach einer weiteren vorteilhaften Ausgestaltung der Erfindung kann der Be- reich des Sammelkastens, in dem die Aussparungen mit den Zungen angeordnet sind, etwas nach innen, d. h. in Richtung der Längstrennwand einge-. zogen 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 area of the collecting box in which the recesses with the tongues are arranged can be slightly inward, ie. H. in the direction of the longitudinal partition. be pulled, which results in a certain "waist" for the cross section of the header tank. This ensures that the cross sections of the longitudinal channels are more or less approximated to a circular cross section beyond a circumference of 270 degrees, which benefits the strength and the 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 can also be advantageous to design the cross sections of the two longitudinal channels not differently, but differently, the position of the partition wall also being off-center, i. H. can be asymmetrical. It is essential in the design of the collecting box that the tongues are arranged approximately at right angles to the connecting strip with the cutouts in order to achieve an optimal tie rod effect.
Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und werden im Folgenden näher beschrieben. Es zeigenEmbodiments of the invention are shown in the drawing and are described in more detail below. Show it
Fig. 1 eine perspektivische Teilansicht eines Gaskühlers,1 is a partial perspective view of a gas cooler,
Fig. 2 einen Schnitt durch den Gaskühler gemäß Fig. 1 , Fig. 3 einen Schnitt entlang der Linie lll-lll in Fig. 2,2 shows a section through the gas cooler according to FIG. 1, FIG. 3 shows a section along the line III-III in FIG. 2,
Fig. 4 ein zweites Ausführungsbeispiel eines Gaskühlers,4 shows a second exemplary embodiment of a gas cooler,
Fig. 5 einen Schnitt durch den Gaskühler gemäß Fig. 4, Fig. 6 einen Schnitt entlang der Linie Vl-Vl in Fig. 5,.5 shows a section through the gas cooler according to FIG. 4, Fig. 6 shows a section along the line VI-VI in Fig. 5 ,.
Fig. 7 ein drittes Ausführungsbeispiel eines Gaskühlers im Schnitt.Fig. 7 shows 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 C02 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 C02 bei einem Druck von etwa 120 bar durchströmt und sekundärseitig von Umgebungsluft beaufschlagt; er hat die Aufgabe, das C02-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 header box 2 and flat tubes 3, which open with their flat tube ends 3a in the header box 2 and are received in slot-shaped openings 4. Between the flat tubes 3 - which is not shown - corrugated fins are provided to enlarge the air-side heat exchange surface. The gas cooler 1 is particularly suitable for use in a refrigerant circuit with CO 2 as the refrigerant of a motor vehicle air conditioning system, but is not restricted to this application. The gas cooler is on the primary side, i.e. H. in the collecting boxes and the flat tubes of gaseous C02 flowed through at a pressure of about 120 bar and exposed to ambient air on the secondary side; it has the task of cooling the C02 gas from a temperature of approx. 150 degrees Celsius to 50 degrees Celsius. The pressure that occurs here is approximately 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 Längskammern 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, it becoming clear that the collecting tank 2 is made in one piece. It has two longitudinal chambers 5, 6, which are separated from one another by a double longitudinal partition 7. The collecting box 2 is made of a sheet metal plate or a sheet metal strip 8 which has outer edge strips or longitudinal edges 9, 10 which are provided with tongues 11, 12. In the middle of the sheet metal tire 8, 13 are arranged in accordance with the arrangement of the tongues 11, 12.
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 zyiinderförmigen 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 Flach- röhre 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 are bent into approximately cylindrical channels 5, 6 and that the longitudinal edges 9, 10 are centered and approximately perpendicular to a central one Connection area 14 are returned where they are inserted into the recesses 13 with the tongues 11, 12. The longitudinal edges 9, 10 are thus fixed, and the collecting box 2 is ready for the soldering process. The flat tube ends 3a are inserted into the openings 4 with their flat tube ends 3a and protrude approximately halfway into the free cross section of the longitudinal channels 5, 6 with their upper edge 3b. Since the cross section of the longitudinal channels 5, 6 here has a maximum width, the cross section which then narrows results in a stop for the flat tubes 3.
Fig. 3 zeigt einen Schnitt durch den Gaskühler 1 in der Ebene lll-lll 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 einer- seitε 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 Flach- rohrabstände zu überspringen und die Zungen 11 , 12 und die Aussparungen 13 in beliebigen Abständen jeweils zwischen zwei Flachrohren anzuordnen.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 between the contour of the flat tube ends 3a and the contour of the notch 15, which opens a flow cross-section between the two longitudinal channels 5, 6. On the one hand, the refrigerant can 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 shape 16 are only given by way of example in the drawing - the shape of the gap can also be modified in such a way that only above the flat tube ends, ie. H. There is a gap above the upper edge 3b or only to the side of the flat tube ends 3a. In the latter case, the flat tube upper edge 3b would abut the notch in the partition 7, which would result in a stop. The tongues 11, 12 protrude from the outer wall of the collecting tank 2 and are each arranged approximately in the middle between two flat tubes 3. However, it is also possible to skip one or more flat tube spacings and to arrange the tongues 11, 12 and the cutouts 13 at any spacing 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 exemplary 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, i. H. arranged on the side facing away from the flat tubes 22.
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 21a, 21b ausfüllen. Die Oberkante 22b liegt damit auf der Höhe der maximalen Breite der Innenquerschnitte. Das Flachrohr 22- hat 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 in principle the same as in the exemplary embodiment according to FIG. 2, but is a mirror image. The collecting box 21 has two longitudinal chambers 21a, 21b which are separated from one another by a double longitudinal partition wall 25. The flat tubes 22 are inserted into the collecting box 21 through an opening that is not visible here, so that they fill about half of the longitudinal channels 21a, 21b with their flat tube ends 22a. The upper edge 22b is thus at the height of the maximum width of the inner cross sections. The Flat tube 22 has a continuous depth t which extends into the collecting box 21.
Fig. 6 zeigt einen Schnitt in der Ebene Vl-Vl 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 Längskammern 21a, 21 bildet. Unmittelbar neben den Flachrohrenden 22a ist kein Spalt belassen. Die Zungen 23 und ebenso die hier nicht sicht- baren 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 collecting box 21, the openings 26 extending over the full depth t of the flat tube 22. Approximately circular notches 27 are arranged above the upper edge 22b of the flat tube ends 22a, which pass 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, 21. No gap is left immediately next to the flat tube ends 22a. The tongues 23 and also the recesses which are not visible here are also arranged here 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 ihnen eingezogen ist, d. h. um einen Betrag x gegenüber einer unteren Begrenzungslinie I des Sammelkastens 31 nach innen versetzt. Dadurch werden die Querschnitte der Langskanale 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 exemplary 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 area 35, this connecting area 35 being slightly retracted after them, i. H. offset inward by an amount x with respect to a lower boundary line I of the collecting tank 31. As a result, the cross sections of the long channels 36, 37 are approximated to the circular shape beyond the three-quarter circle (270 degrees). Nevertheless, the offset central connection area 35 and the double longitudinal partition 33 form a right angle. This cross-sectional shape thus offers a higher compressive strength for the collecting tank 31.
Alle oben beschriebenen Ausführungsbeispiele sind für hohe Innendrücke und damit auch für einen mit C02 betriebenen Kältemittelkreislauf einer Kraftfahrzeug-Klimaanlage geeignet und vorteilhaft. BezugszahlenAll of the exemplary embodiments described above are suitable and advantageous for high internal pressures and thus also for a refrigerant circuit of a motor vehicle air conditioning system operated with CO 2. reference numerals
Gaskühler SammelkastenGas cooler collection box
Flachrohrflat tube
Öffnungopening
Längskanallongitudinal channel
LänskammerLänskammer
LängstrennwandLongitudinal partition
Blechstreifenmetal strip
Längsrandlongitudinal edge
Längsrandlongitudinal edge
Zungetongue
Zungetongue
Aussparung mittlerer VerbindungsbereichCut-out in the middle connecting area
Ausklinkung, U-förmigNotch, U-shaped
Spaltgap
Spaltgap
Gaskühlergas cooler
Sammelkasten a Längskammer b LängskammerCollection box a longitudinal chamber b longitudinal chamber
Flachrohreflat tubes
Zungetongue
Aussparungrecess
LängstrennwandLongitudinal partition
Öffnungopening
Ausklinkungnotch
Spaltgap
Gaskühlergas cooler
Sammelkastencollection box
Flachrohr Längstrennwand • Zungen mittlerer Verbindungsbereich Längskanal Längskanal Spalt flat tube Longitudinal partition • Tongues in the middle of the connecting area Longitudinal channel Longitudinal channel gap

Claims

P a t e n t a n s p r ü c h e Patent claims
1. Wärmeübertrager, insbesondere Gaskühler für einen C02- Kältemittelkreislauf einer Kraftfahrzeug-Klimaanlage, mit mindestens einem Sammelkasten (2), der durch eine Längstrennwand (7) in zwei1. Heat exchanger, in particular gas cooler for a C02 refrigerant circuit of a motor vehicle air conditioning system, with at least one header box (2) through a longitudinal partition (7) in two
Längskanäle (5, 6) unterteilt ist, und einer Reihe von Flachrohren (3) mit Flachrohrenden (3a), die in Öffnungen (4) im Sammelkasten (2) aufgenommen und mit den Längskanälen (5, 6) in Fluidverbindung stehen, dadurch gekennzeichnet, dass der Sammelkasten (2) mit den Längskanälen (5, 6) aus einem vorbereiteten Blechstreifen (8) mitLongitudinal channels (5, 6) is divided, and a series of flat tubes (3) with flat tube ends (3a), which are received in openings (4) in the collecting box (2) and are in fluid communication with the longitudinal channels (5, 6) that the collecting box (2) with the longitudinal channels (5, 6) from a prepared sheet metal strip (8)
Zungen (11, 12) aufweisenden Längsrändern (9, 10) und einem Aussparungen (13) aufweisenden mittleren Verbindungsbereich (14) gebogen ist, wobei die Längsränder (9, 10) die Längstrennwand (7) bilden und über die Zungen (11 , 12) in den Aussparungen (13) veran- kert sind.Tongues (11, 12) having longitudinal edges (9, 10) and a central connecting area (14) having recesses (13) is bent, the longitudinal edges (9, 10) forming the longitudinal partition (7) and over the tongues (11, 12 ) are anchored in the recesses (13).
2. Wärmeübertrager nach Anspruch 1 , dadurch gekennzeichnet, dass die Zungen (11 , 12) und Aussparungen (13) auf der den Flachrohren (3) zugewandten Seite des Sammelkastens (2) angeordnet sind.2. Heat exchanger according to claim 1, characterized in that the tongues (11, 12) and recesses (13) are arranged on the side of the collecting tank (2) facing the flat tubes (3).
3. Wärmeübertrager nach Anspruch 1 , dadurch gekennzeichnet, dass die Zungen (23) und die Aussparungen (24) auf der den Flachrohren (22) abgewandten Seite des Sammelkastens (21) angeordnet sind.3. Heat exchanger according to claim 1, characterized in that the tongues (23) and the recesses (24) on the flat tubes (22) facing away from the header (21) are arranged.
4. Wärmeübertrager nach Anspruch 1 , 2 oder 3, dadurch gekennzeichnet, dass die Längstrennwand (7, 25) Ausklinkungen (15, 27) aufweist, in welche die Flachrohrenden (3a, 22a) eingreifen.4. Heat exchanger according to claim 1, 2 or 3, characterized in that the longitudinal partition (7, 25) has notches (15, 27) in which the flat tube ends (3a, 22a) engage.
5. Wärmeübertrager nach einem der vorhergehenden Ansprüche, da- durch gekennzeichnet, daß der Sammelkasten oder Teile des Sammelkastens mit entsprechenden Umformungen, Anformungen und/oder Versickungen versehen ist, die als Anschläge für die Rohre dienen.5. Heat exchanger according to one of the preceding claims, characterized in that the collecting box or parts of the collecting box with corresponding transformations, formings and / or infiltration is provided, which serve as stops for the pipes.
6. Wärmeübertrager nach Anspruch 4 oder 5, dadurch gekennzeichnet, dass zwischen den Ausklinkungen (15, 27) und den Flachrohrenden (3a, 22a) Spalte (16, 28) belassen sind.6. Heat exchanger according to claim 4 or 5, characterized in that gaps (16, 28) are left between the notches (15, 27) and the flat tube ends (3a, 22a).
7. Wärmeübertrager nach Anspruch 6, dadurch gekennzeichnet, dass die Spalte (16) U-förmig ausgebildet sind.7. Heat exchanger according to claim 6, characterized in that the column (16) are U-shaped.
8. Wärmeübertrager nach Anspruch 6, dadurch gekennzeichnet, dass die Spalte seitlich angeordnet sind und die Ausklinkungen einen Anschlag für die Rohrenden bilden.8. Heat exchanger according to claim 6, characterized in that the gaps are arranged laterally and the notches form a stop for the pipe ends.
9. Wärmeübertrager nach. Anspruch 6, dadurch gekennzeichnet, dass Spalte (28) oberhalb und/oder unterhalb der Flachrohrenden (22a, 22b) angeordnet sind.9. Heat exchanger after . Claim 6, characterized in that gaps (28) are arranged above and / or below the flat tube ends (22a, 22b).
10. Wärmeübertrager nach einem der Ansprüche 1 bis 9, dadurch ge- kennzeichnet, dass die Zungen (11 ,. 12; 23) und Aussparungen (13,10. Heat exchanger according to one of claims 1 to 9, characterized in that the tongues (11,. 12; 23) and recesses (13,
24) zwischen dedem n-ten Flachrohr (3, 22) angeordnet sind, mit n = 1 , 2, 3, 4, 5, ....24) are arranged between the nth flat tube (3, 22), with n = 1, 2, 3, 4, 5, ....
11. Wärmeübertrager nach einem der Ansprüche 1 bis 10, dadurch ge- kennzeichnet, dass die Querschnitte der Längskanäle (5, 6; 23, 24;11. Heat exchanger according to one of claims 1 to 10, characterized in that the cross sections of the longitudinal channels (5, 6; 23, 24;
36, 37) annähernd kreisförmig, insbesondere über einen Umfangsbe- reich von mindesten 270 Grad ausgebildet sind.36, 37) are approximately circular, in particular over a circumferential area of at least 270 degrees.
12. Wärmeübertrager nach Anspruch 11 , dadurch gekennzeichnet, dass der die Zungen (34) aufnehmende mittlere Verbindungsbereich (35) in Richtung der Längstrennwand (33) um einen Betrag x eingezogen oder nach außen gewölbt ist.12. The heat exchanger as claimed in claim 11, characterized in that the central connecting region (35) receiving the tongues (34) is drawn in by an amount x in the direction of the longitudinal partition wall (33) or is curved outwards.
13. Wärmeübertrager nach einem der vorhergehenden Ansprüche, da- durch gekennzeichnet, dass die Querschnitte der Längskanäle verschieden in Form und/oder Größe sind. 13. Heat exchanger according to one of the preceding claims, characterized in that the cross sections of the longitudinal channels are different in shape and / or size.
4. Wärmeübertrager nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Längstrennwand zumindest eine Öffnung oder Ausklinkung oder Überströmöffnung besitzt. 4. Heat exchanger according to one of the preceding claims, characterized in that the longitudinal partition 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

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

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EP (1) EP1588115B1 (en)
JP (1) JP2006513392A (en)
CN (1) CN100573021C (en)
AT (1) ATE442565T1 (en)
AU (1) AU2003303762A1 (en)
BR (1) BR0318023A (en)
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WO (1) WO2004065882A1 (en)

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US20060054313A1 (en) 2006-03-16
EP1588115B1 (en) 2009-09-09
WO2004065882A1 (en) 2004-08-05
AU2003303762A1 (en) 2004-08-13
DE50311904D1 (en) 2009-10-22
ATE442565T1 (en) 2009-09-15
BR0318023A (en) 2005-12-06
DE10302412A1 (en) 2004-07-29
CN1738999A (en) 2006-02-22
JP2006513392A (en) 2006-04-20
CN100573021C (en) 2009-12-23

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