EP1816426B1 - Heat exchanger assembly, in particular of a rear evaporator in a motor vehicle - Google Patents

Heat exchanger assembly, in particular of a rear evaporator in a motor vehicle Download PDF

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Publication number
EP1816426B1
EP1816426B1 EP07000561.6A EP07000561A EP1816426B1 EP 1816426 B1 EP1816426 B1 EP 1816426B1 EP 07000561 A EP07000561 A EP 07000561A EP 1816426 B1 EP1816426 B1 EP 1816426B1
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EP
European Patent Office
Prior art keywords
heat exchanger
refrigerant
arrangement according
flange
opening
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.)
Active
Application number
EP07000561.6A
Other languages
German (de)
French (fr)
Other versions
EP1816426A1 (en
Inventor
Esad Bicic
Gottfried Dipl.-Ing. Dürr
Tobias Fetzer
John Peacock
Jochen Dipl-Ing. Schaudt (FH)
Martin Steinbach
Margareta Wojtizka
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
Mahle Behr GmbH and Co KG
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Filing date
Publication date
Application filed by Mahle Behr GmbH and Co KG filed Critical Mahle Behr GmbH and Co KG
Publication of EP1816426A1 publication Critical patent/EP1816426A1/en
Application granted granted Critical
Publication of EP1816426B1 publication Critical patent/EP1816426B1/en
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Anticipated expiration legal-status Critical

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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
    • F28F9/001—Casings in the form of plate-like arrangements; Frames enclosing a heat exchange core
    • F28F9/002—Casings in the form of plate-like arrangements; Frames enclosing a heat exchange core with fastening means for other structures
    • 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
    • F28F9/0246—Arrangements for connecting header boxes with flow lines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
    • F28D1/047—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag
    • F28D1/0475—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag the conduits having a single U-bend
    • F28D1/0476—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag the conduits having a single U-bend 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
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
    • F28D1/053—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight
    • F28D1/0535—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight the conduits having a non-circular cross-section
    • F28D1/05366—Assemblies of conduits connected to common headers, e.g. core type radiators
    • F28D1/05391—Assemblies of conduits connected to common headers, e.g. core type radiators with multiple rows of conduits or with multi-channel conduits combined with a particular flow pattern, e.g. multi-row multi-stage radiators
    • 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
    • F28D2021/008—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for vehicles
    • F28D2021/0085—Evaporators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F28F9/0219—Arrangements for sealing end plates into casing or header box; Header box sub-elements
    • F28F9/0221—Header boxes or end plates formed by stacked elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F28F9/026—Header boxes; End plates with static flow control means, e.g. with means for uniformly distributing heat exchange media into conduits

Definitions

  • the invention relates to a heat exchanger arrangement, in particular the arrangement of a rear evaporator in a motor vehicle, according to the preamble of claim 1.
  • a heat exchanger arrangement in particular the arrangement of a rear evaporator in a motor vehicle, according to the preamble of claim 1.
  • Such an arrangement is inter alia from the documents EP 1 354 735 A1 and GB 2 245 946 A known.
  • a heat exchanger From the DE 102 60 107 A1 a heat exchanger is known which has tubes which can be flowed through by a first medium along a plurality of hydraulically parallel flow paths constructed from sections (flat tubes) and by a second medium.
  • the heat exchanger has an inlet and an outlet section, wherein in each case a plurality of spaced-apart refrigerant inlet and outlet openings is provided in the inlet or outlet section.
  • the refrigerant is distributed from the corresponding collection chamber to the flow paths, and through the refrigerant outlets, the refrigerant is collected in the corresponding collection chamber and supplied to the discharge section.
  • rear evaporators is often the expansion element in the front of the vehicle (eg in the front engine compartment or in the cabin bulkhead), so that expanded refrigerant in the two-phase state over long lines, possibly over 2 m, back to Rear evaporator must be performed.
  • the lines run here at least partially in the vehicle interior, ie above the vehicle floor, to the arranged in the vehicle interior rear evaporator. Such an arrangement often leads to problems with regard to the safety and comfort of the occupants.
  • a heat exchanger arrangement in particular for a rear evaporator of a motor vehicle, has at least one heat exchanger, which can be flowed through by refrigerant of a refrigerant circuit, and lines, via which refrigerant can be supplied to and discharged from the heat exchanger, wherein the heat exchanger in a through a closed wall , which hereinafter not necessarily perpendicular walls, but also horizontally extending areas are understood, arranged separate from the environment vehicle interior, the other refrigerant circuit - apart from running in the heat exchanger part - outside of the interior is designed to extend, and the connection points of the lines to the Heat exchanger by means of at least one flange fixedly attached to the heat exchanger, which is arranged in an opening in the wall, are arranged outside the interior.
  • connection points or lines By providing a sealed in an opening of the wall flange, which relocates the connection points to the outside, the assembly is simplified. Furthermore, the vehicle interior and the occupants located therein are protected from leakage from the connection points or lines, formed in conventional air conditioning systems in the vehicle interior or at least partially extending in the interior.
  • the sealing of the opening is preferably carried out by an inserted between the heat exchanger and the wall sealing element, which may be formed, for example, by a foam element, which can also compensate for certain unevenness and dimensional variations, without affecting its function.
  • the wall in which the opening is formed for the flange it is preferably the vehicle floor, so that the heat exchanger is supplied from below.
  • the opening for the flange is preferably arranged adjacent to a condensate drain for the condensate collecting in the heat exchanger.
  • CO 2 is preferably provided as the refrigerant, but any other refrigerant may be used.
  • the flange and / or the heat exchanger have at least one nub, which is mounted in a recess or opening of the heat exchanger or flange, in particular is pressed. This allows a simple prefixing, so that simplifies the further assembly of the heat exchanger.
  • the flange is firmly soldered to the heat exchanger.
  • the soldering of the flange with the corresponding surface of the heat exchanger is preferably carried out in one operation with the actual soldering of the heat exchanger, so that only one soldering operation is required, thereby Energy and time and thus manufacturing costs can be saved.
  • the flange is preferably arranged on the heat exchanger base at a collection or distribution box.
  • the collection or distribution box as well as the flange preferably flat surfaces, which are brought into abutment against each other and firmly connected, so that a secure and tight connection of the flange and heat exchanger can be ensured.
  • the invention is used for a rear evaporator, which is constructed such that the inflowing into the heat exchanger refrigerant flow is distributed by a distributor to at least two separate strands, such that there is no mutual mixing of each flowing therein refrigerant partial flow.
  • a combination of the refrigerant partial streams, in particular in the output region of the heat exchanger should not be excluded. This configuration makes it possible, in particular in cases when the refrigerant is in a two-phase, segregated state at the evaporator inlet, a uniform temperature distribution across the heat exchanger, and thus also the largest possible cooling capacity with small dimensions of the heat exchanger.
  • a heat exchanger in particular a rear evaporator for a motor vehicle, with pipes and a collecting box comprising a distributor plate, a baffle and a bottom plate in which the tubes end with at least one of its ends, and which can be flowed through by refrigerant is, wherein the collecting box has exactly one opening in the distributor plate, through which refrigerant enters the collecting box and immediately after which the refrigerant flow is distributed to at least two strands.
  • the refrigerant distribution is preferably uniformly to exactly two strands.
  • the uniform refrigerant distribution due to the one opening in the distributor plate, which is provided with an injection distributor opening in the subsequently arranged baffle, allows a uniform distribution of the refrigerant, in particular even if the refrigerant is in a two-phase, segregated state, in others Evaporators leads to a highly non-uniform temperature profile. Due to the uniform distribution of refrigerant so the comfort of the rear vehicle occupants is significantly increased, the measures for this are very inexpensive.
  • R744 carbon dioxide
  • the injection distributor opening adjoining the opening in the distributor plate is preferably H-shaped. This form allows in a particularly simple and cost-effective manner a uniform distribution of the refrigerant on the two strands.
  • the baffle preferably has not only an H-shaped injection manifold opening but also a plurality of H-shaped openings for deflecting the flow of refrigerant from one pipe to the adjacent pipe. Due to the H-shaped configuration, the refrigerant at each deflection in the Mixed collection box, so that the temperature profile over the flat tubes is very even.
  • the baffle preferably also has an H-shaped refrigerant outlet opening, which is arranged after the corresponding opening in the distributor plate and through which the refrigerant is sucked out of the collecting box.
  • the symmetrical design of the outlet opening supports a uniform temperature profile.
  • the H-shaped opening is designed to guide and optimize the flow with rounded corners.
  • the H-shaped opening is preferably formed rounded at its leg ends, wherein the width of the leg slightly widened.
  • the leg itself preferably ends straight.
  • the H-shaped opening preferably has a leg width which corresponds approximately to the width of the transverse connection between the two legs.
  • this embodiment enables a good mixing of the refrigerant in the region of the deflection and, on the other hand, it enables a sufficiently resilient design and solubility of the deflection plate.
  • the heat exchanger is preferably designed in two rows, wherein it is preferably also built very small.
  • the injection manifold opening - seen in the flow direction of the heat exchanger through the air flowing - preferably arranged in the last row of tubes. Accordingly, the outlet opening is opposite on the other Side, ie: in the - seen in the flow direction of the heat exchanger through the air flowing - the first row of tubes.
  • the heat exchanger is, in order to obtain a uniform temperature profile as possible, preferably mirror images to the central transverse axis and / or point symmetrical to the central axis formed, wherein - in the case of an unsuitable number of tubes - the corresponding inlet and outlet openings can also be arranged offset by one row.
  • asymmetrical air inflow it may also be advantageous to provide a different path length of the two strands through which the refrigerant flows through the heat exchanger. The same applies in other cases, e.g. if due to the evaporator width or due to the installation conditions no symmetrical division is possible.
  • the flange on which the injection tube and / or the suction tube are mounted is soldered directly to the heat exchanger, resulting in a complete solution with as few soldering / connection points.
  • the soldering - including the collecting box - can be done in one step, so that the manufacturing costs can be minimized.
  • a collecting box 5 formed from sheet metal plates and a plurality of double-row arranged, U-shaped bent flat tubes 6, between which corrugated fin packages are arranged, as in Fig. 3 regionally indicated.
  • the collecting box 5 has a distributor plate 7, each with an opening 8, which are continued in the flange 2 in the form of two passages 3a and 3b, for the injection (8a) and suction (8b) of the refrigerant by means of the injection or the suction tube a soldered to the distributor plate 7 baffle 10 and a soldered to the baffle plate 10 bottom plate 11 with a plurality of slot-shaped openings 12 into which the ends of the U-shaped flat tubes 6 are inserted and soldered to the same.
  • the injection tube is fixedly connected at its end with a corresponding opening in the flange 2 by means of a not shown in the drawing, formed in a manner known in principle fastening device with a pin and a screwed into the flange 2 screw.
  • the suction pipe is formed according to the injection pipe and secured to the flange 2 by a second fastening device, wherein, however, the diameter of the suction pipe, in particular the inner diameter due to the larger volume flow, which must be removed, is greater than that of the injection pipe.
  • the flange 2 is formed substantially cuboid.
  • the passage 3 a in the flange 2 for the supply of the refrigerant to the heat exchanger 1 is starting from a bore in an obliquely extending on the underside of the flange 2 channel (see Fig. 8 ), which is closed by the distributor plate 7 and ends in the region of the opening 8a.
  • the channel course is due to the design of the refrigerant supply.
  • the refrigerant discharge takes place via the passage 3b designed as a bore with different diameter changes.
  • a simple bore can also be provided for the passage 3a, as for the discharge of the refrigerant (passage 3b).
  • the function of the baffle 10 is primarily the deflection of the effluent from a flat tube 6 refrigerant to the adjacent flat tube 6, wherein the refrigerant is to be mixed in addition, so that a uniform temperature profile is possible.
  • At both longitudinal ends of the baffle 10 each have a slot-like opening 16 is provided, which extends in length over both rows of H-shaped openings 15 and directs the refrigerant from one row to the other row.
  • openings 15, in particular that of the openings 15, which serve only the deflection of a flat tube 6 to the adjacent flat tube 6 and possibly also the discharge of the last two flow-through flat tubes 6 in the suction pipe, possible.
  • an H-shaped configuration is particularly advantageous.
  • the H-shaped configuration of an injection distributor opening 15a, which is arranged opposite to the refrigerant outlet of the distributor plate 7, corresponds in the present case exactly to that of the other openings 15, whereby exactly this embodiment is particularly advantageous with regard to a uniform distribution of the refrigerant to the two strands.
  • the discharge opening 15b of the deflection plate 10, which is opposite the refrigerant outlet of the distributor plate 7, is likewise designed accordingly.
  • the H-shape of the openings 15, 15a and 15b has rounded edges in all areas, wherein the centrally disposed ends of the legs are provided with outwardly projecting rounded portions, so that the leg width is slightly enlarged at the ends (see. Fig. 12 ).
  • the cross-connection has twice the width as the legs.
  • the leg width corresponds approximately to the width of the opening of the flat tubes 6, the tine length is formed accordingly.
  • the present rear evaporator has, as is common practice, compared to conventional evaporators, as used for front-side motor vehicle air conditioners, reduced dimensions. While conventional front evaporator dimensions range from 180 mm to 310 mm for the width, 180 mm to 260 mm for the height and 40 mm to 50 mm for the depth, the present heat exchanger has a width of 130 mm and a height of 130 mm at a depth of 40 mm. However, all values in the range of 100 mm to 160 mm, in particular 110 mm to 150 mm, especially 120 mm to 140 mm for height and / or width of the rear evaporator are particularly favorable.
  • the collection box 5 is arranged below, so that the flange 2 is positioned below the heat exchanger 1 and the supply and discharge takes place from below or downwards accordingly.
  • the heat exchanger 1 is placed directly on the vehicle floor 20, which in the region of the flange 2 has an opening 21 through which the flange 2 projects.
  • the opening 21 is hermetically sealed by means of a sealing element 22 arranged between the distributor plate 7 and the edge of the vehicle floor 20.
  • a sealing element 22 arranged between the distributor plate 7 and the edge of the vehicle floor 20.
  • Around the opening 21 around a rib structure is formed for stiffening.
  • a condensate drain 23 is provided, through which the condensate collecting in the heat exchanger 1 can be discharged down.
  • the condensate drain 23 is formed to run well below the flange 2, i. to below the connection level of the injection and suction pipe.
  • the flange 2 on the distributor plate 7 by means of a nub 3c (see Fig. 8 ) which projects beyond the underside of the flange 2 and which in a provided in the distributor plate 7 mounting opening 8 c (see Fig. 14 ) is pressed in, prefixed and, after the baffle plate 10 and the bottom plate 11 caulked with the distributor plate 7 and then the flat tubes 6 are mounted together with corrugated fins packages soldered in the context of soldering the entire heat exchanger 1 in a single soldering.
  • the connection of the pipes and the filling of the refrigerant circuit with refrigerant takes place only during the assembly in the vehicle.
  • nubs and mounting holes may be provided, in particular preferably three, wherein the nubs in principle also on the Distributor plate 7 and the mounting holes can be arranged on the flange 2 or a mixed configuration, ie nubs on both the flange and on the distributor plate, is possible.
  • the heat exchanger according to the embodiment described above is at operating pressures of 90 bar here, but at least 50 bar, designed (test pressure in this case 160 bar), so that in particular R744, ie CO 2 , can be used as a refrigerant.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Air-Conditioning For Vehicles (AREA)

Description

Die Erfindung betrifft eine Wärmeübertrageranordnung, insbesondere die Anordnung eines Heckverdampfers in einem Kraftfahrzeug, gemäß dem Oberbegriff des Anspruchs 1. Eine solche Anordnung ist unter anderem aus den Druckschriften EP 1 354 735 A1 und GB 2 245 946 A bekannt. Aus der DE 102 60 107 A1 ist ein Wärmeübertrager bekannt, der Rohre aufweist, die von einem ersten Medium entlang mehrerer hydraulisch paralleler, aus Abschnitten aufgebauter Strömungspfade (Flachrohre), durchströmbar und von einem zweiten Medium umströmbar sind. Der Wärmeübertrager weist einen Einlass- und einen Auslassabschnitt auf, wobei im Einlass- oder Auslassabschnitt jeweils eine Mehrzahl voneinander beabstandeter Kältemittelein- bzw. -auslässe vorgesehen ist. Durch die Kältemitteleinlässe wird das Kältemittel von der entsprechenden Sammelkammer auf die Strömungspfade verteilt, und durch die Kältemittelauslässe wird das Kältemittel in der entsprechenden Sammelkammer gesammelt und dem Auslassabschnitt zugeführt. Bei Heckverdampfern befindet sich häufig das Expansionsorgan vorn im Fahrzeug (z.B. im vorne liegenden Motorraum bzw. im Bereich der Kabinen-Spritzwand), so dass expandiertes Kältemittel im zweiphasigen Zustand über lange Leitungen, ggf. über 2 m, nach hinten zum Heckverdampfer geführt werden muss. Die Leitungen verlaufen hierbei zumindest bereichsweise im Fahrzeuginnenraum, d.h. oberhalb des Fahrzeugbodens, zu dem im Fahrzeuginnenraum angeordneten Heckverdampfer. Eine derartige Anordnung führt häufig zu Problemen in Hinblick auf die Sicherheit und den Komfort der Insassen.The invention relates to a heat exchanger arrangement, in particular the arrangement of a rear evaporator in a motor vehicle, according to the preamble of claim 1. Such an arrangement is inter alia from the documents EP 1 354 735 A1 and GB 2 245 946 A known. From the DE 102 60 107 A1 a heat exchanger is known which has tubes which can be flowed through by a first medium along a plurality of hydraulically parallel flow paths constructed from sections (flat tubes) and by a second medium. The heat exchanger has an inlet and an outlet section, wherein in each case a plurality of spaced-apart refrigerant inlet and outlet openings is provided in the inlet or outlet section. Through the refrigerant inlets, the refrigerant is distributed from the corresponding collection chamber to the flow paths, and through the refrigerant outlets, the refrigerant is collected in the corresponding collection chamber and supplied to the discharge section. In rear evaporators is often the expansion element in the front of the vehicle (eg in the front engine compartment or in the cabin bulkhead), so that expanded refrigerant in the two-phase state over long lines, possibly over 2 m, back to Rear evaporator must be performed. The lines run here at least partially in the vehicle interior, ie above the vehicle floor, to the arranged in the vehicle interior rear evaporator. Such an arrangement often leads to problems with regard to the safety and comfort of the occupants.

Es ist daher Aufgabe der Erfindung, eine verbesserte Wärmeübertrageranordnung zur Verfügung zu stellen.It is therefore an object of the invention to provide an improved heat exchanger assembly available.

Diese Aufgabe wird gelöst durch eine Wärmeübertrageranordnung mit den Merkmalen des Anspruchs 1. Vorteilhafte Ausgestaltungen sind Gegenstand der Unteransprüche.This object is achieved by a heat exchanger arrangement with the features of claim 1. Advantageous embodiments are the subject of the dependent claims.

Eine erfindungsgemäße Wärmeübertrageranordnung, insbesondere für einen Heckverdampfer eines Kraftfahrzeugs, weist mindestens einen Wärmeübertrager, der von Kältemittel eines Kältemittelkreislaufs durchströmbar ist, und Leitungen, über welche Kältemittel dem Wärmeübertrager zuführbar und von demselben abführbar ist, auf, wobei der Wärmeübertrager in einem durch eine geschlossene Wand, worunter im Folgenden nicht notwendigerweise senkrecht verlaufende Wände, sondern auch horizontal verlaufende Bereiche verstanden werden, von der Umgebung getrennten Fahrzeuginnenraum angeordnet, der weitere Kältemittelkreislauf - abgesehen vom im Wärmeübertrager verlaufenden Teil - außerhalb des Innenraumes verlaufend ausgebildet ist, und die Anschlussstellen der Leitungen an den Wärmeübertrager mittels mindestens eines an dem Wärmeübertrager fest angebrachten Flansches, der in einer Öffnung in der Wand angeordnet ist, außerhalb des Innenraumes angeordnet sind. Durch das Vorsehen eines in einer Öffnung der Wand abgedichtet angeordneten Flansches, welcher die Anschlussstellen nach außen verlegt, vereinfacht sich die Montage. Ferner wird der Fahrzeuginnenraum und die sich hierin befindlichen insassen, vor Leckagen aus den Anschlussstellen oder Leitungen geschützt, die bei herkömmlichen Klimaanlagen im Fahrzeuginnenraum oder zumindest bereichsweise im Innenraum verlaufend ausgebildet sind.A heat exchanger arrangement according to the invention, in particular for a rear evaporator of a motor vehicle, has at least one heat exchanger, which can be flowed through by refrigerant of a refrigerant circuit, and lines, via which refrigerant can be supplied to and discharged from the heat exchanger, wherein the heat exchanger in a through a closed wall , Which hereinafter not necessarily perpendicular walls, but also horizontally extending areas are understood, arranged separate from the environment vehicle interior, the other refrigerant circuit - apart from running in the heat exchanger part - outside of the interior is designed to extend, and the connection points of the lines to the Heat exchanger by means of at least one flange fixedly attached to the heat exchanger, which is arranged in an opening in the wall, are arranged outside the interior. By providing a sealed in an opening of the wall flange, which relocates the connection points to the outside, the assembly is simplified. Furthermore, the vehicle interior and the occupants located therein are protected from leakage from the connection points or lines, formed in conventional air conditioning systems in the vehicle interior or at least partially extending in the interior.

Die Abdichtung der Öffnung erfolgt vorzugsweise durch ein zwischen den Wärmeübertrager und die Wand eingelegtes Dichtelement, welches bspw. durch ein Schaumstoffelement gebildet sein kann, das gleichzeitig auch gewisse Unebenheiten und Maßschwankungen ausgleichen kann, ohne dass seine Funktion beeinträchtigt wird.The sealing of the opening is preferably carried out by an inserted between the heat exchanger and the wall sealing element, which may be formed, for example, by a foam element, which can also compensate for certain unevenness and dimensional variations, without affecting its function.

Bei der Wand, in welche die Öffnung für den Flansch ausgebildet ist, handelt es sich vorzugsweise um den Fahrzeugboden, so dass der Wärmeübertrager von unten her versorgt wird.In the wall in which the opening is formed for the flange, it is preferably the vehicle floor, so that the heat exchanger is supplied from below.

Die Öffnung für den Flansch ist vorzugsweise benachbart zu einem Kondensatablauf für das sich im Wärmeübertrager sammelnde Kondensat angeordnet.The opening for the flange is preferably arranged adjacent to a condensate drain for the condensate collecting in the heat exchanger.

Im Kältemittelkreislauf ist vorzugsweise CO2 als Kältemittel vorgesehen, jedoch kann auch ein beliebiges anderes Kältemittel verwendet werden.In the refrigerant circuit, CO 2 is preferably provided as the refrigerant, but any other refrigerant may be used.

Der Flansch und/oder der Wärmeübertrager weisen mindestens eine Noppe auf, welche in eine Vertiefung oder Öffnung des Wärmeübertragers bzw. Flansches angebracht ist, insbesondere eingepresst ist. Dies ermöglicht eine einfache Vorfixierung, so dass sich der weitere Zusammenbau des Wärmeübertragers vereinfacht.The flange and / or the heat exchanger have at least one nub, which is mounted in a recess or opening of the heat exchanger or flange, in particular is pressed. This allows a simple prefixing, so that simplifies the further assembly of the heat exchanger.

Vorzugsweise ist der Flansch am Wärmeübertrager fest angelötet. Dabei erfolgt das Verlöten des Flansches mit der entsprechenden Fläche des Wärmeübertragers bevorzugt in einem Arbeitsgang mit dem eigentlichen Verlöten des Wärmeübertragers, so dass nur ein Lötvorgang erforderlich ist, wodurch Energie und Zeit und somit Herstellungskosten eingespart werden können.Preferably, the flange is firmly soldered to the heat exchanger. In this case, the soldering of the flange with the corresponding surface of the heat exchanger is preferably carried out in one operation with the actual soldering of the heat exchanger, so that only one soldering operation is required, thereby Energy and time and thus manufacturing costs can be saved.

Der Flansch ist vorzugsweise auf der Wärmeübertragerunterseite an einem Sammel- oder Verteilerkasten angeordnet. Dabei weist der Sammel- oder Verteilerkasten wie auch der Flansch vorzugsweise ebene Flächen auf, welche in Anlage aneinander gebracht und miteinander fest verbunden werden, so dass eine sichere und dichte Verbindung von Flansch und Wärmeübertrager gewährleistet werden kann.The flange is preferably arranged on the heat exchanger base at a collection or distribution box. In this case, the collection or distribution box as well as the flange preferably flat surfaces, which are brought into abutment against each other and firmly connected, so that a secure and tight connection of the flange and heat exchanger can be ensured.

Vorzugsweise wird die Erfindung für einen Heckverdampfer verwendet, welcher derart aufgebaut ist, dass der in den Wärmeübertrager einströmende Kältemittelstrom durch eine Verteileinrichtung auf mindestens zwei voneinander getrennte Stränge verteilt wird, derart, dass es zu keiner gegenseitigen Durchmischung des jeweils darin strömenden Kältemittelteilstroms kommt. Eine Zusammenführung der Kältemittelteilströme, insbesondere im Ausgangsbereich des Wärmeübertragers soll jedoch nicht ausgeschlossen werden. Diese Ausbildung ermöglicht insbesondere in Fällen, wenn das Kältemittel in einem zweiphasigen, entmischten Zustand am Verdampfereingang vorliegt, eine gleichmäßige Temperaturverteilung über den Wärmeübertrager hinweg, und damit auch eine möglichst große Kälteleistung bei geringen Abmessungen des Wärmeübertragers. Bei anderen Verdampfern führt ein solches zweiphasiges, entmischtes Kältemittel üblicherweise zu einem stark uneinheitlichen Temperaturprofil. Durch die gleichmäßige Kältemittelverteilung kann also der Komfort der hinteren Kraftfahrzeug-Insassen deutlich erhöht werden, wobei die Maßnahmen hierfür sehr kostengünstig sind. Das gesagte gilt insbesondere für R744 (Kohlendioxid) als Kältemittel, da es sich gezeigt hat, dass hier die Temperaturverteilung besonders gut homogenisiert werden kann.Preferably, the invention is used for a rear evaporator, which is constructed such that the inflowing into the heat exchanger refrigerant flow is distributed by a distributor to at least two separate strands, such that there is no mutual mixing of each flowing therein refrigerant partial flow. A combination of the refrigerant partial streams, in particular in the output region of the heat exchanger should not be excluded. This configuration makes it possible, in particular in cases when the refrigerant is in a two-phase, segregated state at the evaporator inlet, a uniform temperature distribution across the heat exchanger, and thus also the largest possible cooling capacity with small dimensions of the heat exchanger. In other evaporators, such a two-phase, demixed refrigerant usually leads to a highly non-uniform temperature profile. By the uniform distribution of refrigerant so the comfort of the rear vehicle occupants can be significantly increased, the measures for this are very inexpensive. The above applies in particular to R744 (carbon dioxide) as a refrigerant, since it has been shown that the temperature distribution can be homogenized particularly well here.

Bei der Wärmeübertrageranordnung kann auch ein Wärmeübertrager vorgesehen sein, insbesondere ein Heckverdampfer für ein Kraftfahrzeug, mit Rohren und einem Sammelkasten, der eine Verteilerplatte, ein Umlenkblech und eine Bodenplatte umfasst, in welchem die Rohre mit mindestens einem ihrer Enden enden, und der von Kältemittel durchströmbar ist, wobei der Sammelkasten genau eine Öffnung in der Verteilerplatte aufweist, durch welche Kältemittel in den Sammelkasten gelangt und direkt nach welcher der Kältemittelstrom auf mindestens zwei Stränge verteilt wird. Dabei erfolgt die Kältemittelverteilung bevorzugt gleichmäßig auf genau zwei Stränge. Die gleichmäßige Kältemittelverteilung in Folge der einen Öffnung in der Verteilerplatte, die mit einer Einspritz-Verteileröffnung in dem danach angeordneten Umlenkblech vorgesehen ist, ermöglicht eine gleichmäßige Verteilung des Kältemittels, insbesondere auch, wenn das Kältemittel in einem zweiphasigen, entmischten Zustand vorliegt, der bei anderen Verdampfern zu einem stark uneinheitlichen Temperaturprofil führt. Durch die gleichmäßige Kältemittelverteilung wird also der Komfort der hinteren Kraftfahrzeug-Insassen deutlich erhöht, wobei die Maßnahmen hierfür sehr kostengünstig sind. Das gesagte gilt insbesondere für R744 (Kohlendioxid) als Kältemittel, da es sich gezeigt hat, dass hier die Temperaturverteilung besonders gut homogenisiert werden kann.In the heat exchanger assembly may also be provided a heat exchanger, in particular a rear evaporator for a motor vehicle, with pipes and a collecting box comprising a distributor plate, a baffle and a bottom plate in which the tubes end with at least one of its ends, and which can be flowed through by refrigerant is, wherein the collecting box has exactly one opening in the distributor plate, through which refrigerant enters the collecting box and immediately after which the refrigerant flow is distributed to at least two strands. The refrigerant distribution is preferably uniformly to exactly two strands. The uniform refrigerant distribution due to the one opening in the distributor plate, which is provided with an injection distributor opening in the subsequently arranged baffle, allows a uniform distribution of the refrigerant, in particular even if the refrigerant is in a two-phase, segregated state, in others Evaporators leads to a highly non-uniform temperature profile. Due to the uniform distribution of refrigerant so the comfort of the rear vehicle occupants is significantly increased, the measures for this are very inexpensive. The above applies in particular to R744 (carbon dioxide) as a refrigerant, since it has been shown that the temperature distribution can be homogenized particularly well here.

Die an die Öffnung in der Verteilerplatte anschließende Einspritz-Verteileröffnung ist vorzugsweise H-förmig ausgebildet. Diese Form ermöglicht auf besonders einfache und kostengünstige Weise eine möglichst gleichmäßige Verteilung des Kältemittels auf die beiden Stränge.The injection distributor opening adjoining the opening in the distributor plate is preferably H-shaped. This form allows in a particularly simple and cost-effective manner a uniform distribution of the refrigerant on the two strands.

Das Umlenkblech weist bevorzugt nicht nur eine H-förmige Einspritz-Verteileröffnung sondern auch mehrere H-förmige Öffnungen zur Umlenkung des Kältemittelstroms von einem Rohr zum benachbarten Rohr auf. Durch die H-förmige Ausgestaltung wird das Kältemittel bei jedem Umlenken im Sammelkasten vermischt, so dass das Temperaturprofil über die Flachrohre selbst sehr gleichmäßig ist.The baffle preferably has not only an H-shaped injection manifold opening but also a plurality of H-shaped openings for deflecting the flow of refrigerant from one pipe to the adjacent pipe. Due to the H-shaped configuration, the refrigerant at each deflection in the Mixed collection box, so that the temperature profile over the flat tubes is very even.

Bevorzugt weist auch das Umlenkblech eine H-förmige Kältemittelauslass-Öffnung auf, welche nach der entsprechenden Öffnung in der Verteilerplatte angeordnet ist und durch die das Kältemittel aus dem Sammelkasten gesaugt wird. Die symmetrische Ausgestaltung der Auslassöffnung unterstützt ein gleichmäßiges Temperaturprofil.The baffle preferably also has an H-shaped refrigerant outlet opening, which is arranged after the corresponding opening in the distributor plate and through which the refrigerant is sucked out of the collecting box. The symmetrical design of the outlet opening supports a uniform temperature profile.

Die H-förmige Öffnung ist zur Lenkung und Optimierung der Strömung mit abgerundeten Ecken ausgebildet.The H-shaped opening is designed to guide and optimize the flow with rounded corners.

Die H-förmige Öffnung ist bevorzugt an ihren Schenkelenden abgerundet ausgebildet, wobei sich die Breite des Schenkels etwas erweitert. Der Schenkel selbst endet bevorzugt gerade.The H-shaped opening is preferably formed rounded at its leg ends, wherein the width of the leg slightly widened. The leg itself preferably ends straight.

Die H-förmige Öffnung weist bevorzugt eine Schenkelbreite auf, die etwa der Breite der Querverbindung zwischen den beiden Schenkeln entspricht. Diese Ausgestaltung ermöglicht zum Einen eine gute Vermischung des Kältemittels im Bereich der Umlenkung und zum Anderen ermöglicht sie eine ausreichend belastbare Ausgestaltung und Anlötbarkeit des Umlenkblechs.The H-shaped opening preferably has a leg width which corresponds approximately to the width of the transverse connection between the two legs. On the one hand, this embodiment enables a good mixing of the refrigerant in the region of the deflection and, on the other hand, it enables a sufficiently resilient design and solubility of the deflection plate.

Der Wärmeübertrager ist bevorzugt zweireihig ausgebildet, wobei er vorzugsweise auch sehr klein gebaut ist.The heat exchanger is preferably designed in two rows, wherein it is preferably also built very small.

Um ein möglichst gleichmäßiges Temperaturprofil und einen guten Wirkungsgrad des Wärmeübertragers zu ermöglichen, ist die Einspritz-Verteileröffnung - in Strömungsrichtung der den Wärmeübertrager durchströmenden Luft gesehen - vorzugsweise in der letzten Rohrreihe angeordnet. Entsprechend ist die Auslassöffnung gegenüberliegend auf der anderen Seite, d.h: in der - in Strömungsrichtung der den Wärmeübertrager durchströmenden Luft gesehen - ersten Rohrreihe angeordnet.In order to enable the most uniform possible temperature profile and a good efficiency of the heat exchanger, the injection manifold opening - seen in the flow direction of the heat exchanger through the air flowing - preferably arranged in the last row of tubes. Accordingly, the outlet opening is opposite on the other Side, ie: in the - seen in the flow direction of the heat exchanger through the air flowing - the first row of tubes.

Der Wärmeübertrager ist, um ein möglichst gleichmäßiges Temperaturprofil zu erhalten, vorzugsweise spiegelbildlich zur Mittelquerachse und/oder punktsymmetrisch zur Mittelachse ausgebildet, wobei - im Falle einer hierfür ungeeigneten Rohranzahl - die entsprechenden Ein- und Auslassöffnungen auch jeweils um eine Reihe versetzt angeordnet sein können. Bei einer asymmetrischen Luftanströmung kann es jedoch auch vorteilhaft sein, eine unterschiedliche Weglänge der beiden Stränge, durch welche das Kältemittel den Wärmeübertrager durchströmt, vorzusehen. Entsprechendes gilt auch in anderen Fällen, z.B. wenn aufgrund der Verdampferbreite oder aufgrund der Einbaugegebenheiten keine symmetrische Aufteilung möglich ist.The heat exchanger is, in order to obtain a uniform temperature profile as possible, preferably mirror images to the central transverse axis and / or point symmetrical to the central axis formed, wherein - in the case of an unsuitable number of tubes - the corresponding inlet and outlet openings can also be arranged offset by one row. In the case of an asymmetrical air inflow, however, it may also be advantageous to provide a different path length of the two strands through which the refrigerant flows through the heat exchanger. The same applies in other cases, e.g. if due to the evaporator width or due to the installation conditions no symmetrical division is possible.

Der Flansch, an dem das Einspritzrohr und/oder das Saugrohr angebracht sind, ist direkt mit dem Wärmeübertrager verlötet, wodurch sich eine Komplettlösung mit möglichst wenig Löt-/Verbindungsstellen ergibt. Das Verlöten - einschließlich des Sammelkastens - kann in einem Schritt erfolgen, so dass die Herstellungskosten minimiert werden können.The flange on which the injection tube and / or the suction tube are mounted, is soldered directly to the heat exchanger, resulting in a complete solution with as few soldering / connection points. The soldering - including the collecting box - can be done in one step, so that the manufacturing costs can be minimized.

Im Folgenden wird die Erfindung anhand eines Ausführungsbeispiels mit mehreren Varianten unter Bezugnahme auf die Zeichnung im Einzelnen erläutert. In der Zeichnung zeigen:

Fig. 1
eine Ansicht auf einen Fahrzeugboden im Bereich der Anordnung eines Wärmeübertragers von unten mit einer Detailansicht eines Teilbereichs,
Fig. 2
einem Schnitt durch Fig. 1 entlang Linie A-A mit einer Detailansicht eines Teilbereichs,
Fig. 3
eine Frontalansicht des Wärmeübertragers samt Flansch in Richtung des Pfeiles III von Fig. 5,
Fig. 4
eine Ansicht des Wärmeübertragers mit Flansch in Richtung des Pfeiles IV von Fig. 3,
Fig. 5
eine Seitenansicht des Wärmeübertragers mit Flansch in Richtung des Pfeiles V von Fig.3,
Fig. 6
einen Schnitt entlang Linie VI-VI von Fig. 4,
Fig. 7
eine perspektivische Ansicht des Flansches zur Verdeutlichung der Anschlüsse,
Fig. 8
eine perspektivische Ansicht des Flansches aus der entgegengesetzten Richtung,
Fig. 9
eine perspektivische Ansicht des auf die Bodenplatte aufgesetzten Flansches,
Fig. 10
einen ausschnittsweisen Schnitt durch den Flansch, die Verteilerplatte, das Umlenkblech und die Bodenplatte in Längsrichtung des Wärmeübertragers,
Fig. 11
eine perspektivische Ansicht des Umlenkblechs,
Fig. 12
eine Detailansicht eines Ausschnitts des Umlenkblechs von Fig. 11,
Fig. 13
eine perspektivische Ansicht der Bodenplatte, und
Fig. 14
eine perspektivische Ansicht der Verteilerplatte.
In the following the invention will be explained with reference to an embodiment with several variants with reference to the drawings in detail. In the drawing show:
Fig. 1
a view of a vehicle floor in the region of the arrangement of a heat exchanger from below with a detailed view of a partial area,
Fig. 2
a cut through Fig. 1 along line AA with a detail view of a section,
Fig. 3
a front view of the heat exchanger including flange in the direction of arrow III of Fig. 5 .
Fig. 4
a view of the heat exchanger with flange in the direction of arrow IV of Fig. 3 .
Fig. 5
a side view of the heat exchanger with flange in the direction of arrow V of Figure 3 .
Fig. 6
a section along line VI-VI of Fig. 4 .
Fig. 7
a perspective view of the flange to illustrate the connections,
Fig. 8
a perspective view of the flange from the opposite direction,
Fig. 9
a perspective view of the patch on the bottom plate flange,
Fig. 10
a partial section through the flange, the distributor plate, the baffle and the bottom plate in the longitudinal direction of the heat exchanger,
Fig. 11
a perspective view of the baffle,
Fig. 12
a detailed view of a section of the baffle of Fig. 11 .
Fig. 13
a perspective view of the bottom plate, and
Fig. 14
a perspective view of the distributor plate.

Ein in einem nicht näher dargestellten Kältemittelkreislauf angeordneter Wärmeübertrager 1, vorliegend ein Heckverdampfer eines Kraftfahrzeugs, der über einen Flansch 2 und je ein an diesem Flansch 2 angeschlossenes Einspritzrohr und Saugrohr (nicht dargestellt) mit einem entfernt im Frontbereich angeordneten Expansionsorgan (nicht dargestellt) verbunden ist, weist gemäß dem vorliegenden Ausführungsbeispiel einen aus Blechplatten gebildeten Sammelkasten 5 und eine Mehrzahl von zweireihig angeordneten, U-förmig gebogenen Flachrohren 6 auf, zwischen denen Wellrippenpakete angeordnet sind, wie in Fig. 3 bereichsweise angedeutet.A arranged in a refrigerant circuit not shown heat exchanger 1, in this case a rear evaporator of a motor vehicle, which is connected via a flange 2 and one connected to this flange 2 injection pipe and suction pipe (not shown) with a remote in the front region arranged expansion element (not shown) , According to the present embodiment, a collecting box 5 formed from sheet metal plates and a plurality of double-row arranged, U-shaped bent flat tubes 6, between which corrugated fin packages are arranged, as in Fig. 3 regionally indicated.

Der Sammelkasten 5 weist eine Verteilerplatte 7 mit je einer Öffnung 8, welche in dem Flansch 2 in Form zweier Durchführungen 3a und 3b weitergeführt sind, für das Einspritzen (8a) und Absaugen (8b) des Kältemittels mit Hilfe des Einspritz- bzw. des Saugrohres, ein mit der Verteilerplatte 7 verlötetes Umlenkblech 10 und eine mit dem Umlenkblech 10 verlötete Bodenplatte 11 mit einer Mehrzahl von langlochförmigen Öffnungen 12 auf, in welche die Enden der U-förmig gebogenen Flachrohre 6 eingeführt und mit derselben verlötet sind.The collecting box 5 has a distributor plate 7, each with an opening 8, which are continued in the flange 2 in the form of two passages 3a and 3b, for the injection (8a) and suction (8b) of the refrigerant by means of the injection or the suction tube a soldered to the distributor plate 7 baffle 10 and a soldered to the baffle plate 10 bottom plate 11 with a plurality of slot-shaped openings 12 into which the ends of the U-shaped flat tubes 6 are inserted and soldered to the same.

Das Einspritzrohr ist an seinem Ende mit einer entsprechenden Öffnung in dem Flansch 2 mit Hilfe einer nicht in der Zeichnung dargestellten, auf im Prinzip bekannte Weise ausgebildete Befestigungsvorrichtung mit einem Stift und einer in den Flansch 2 eingeschraubten Schraube fest verbunden. Das Saugrohr ist entsprechend dem Einspritzrohr ausgebildet und am Flansch 2 durch eine zweite Befestigungsvorrichtung gesichert, wobei jedoch der Durchmesser des Saugrohres, insbesondere der Innendurchmesser auf Grund des größeren Volumenstroms, der abgeführt werden muss, größer ist als der des Einspritzrohres.The injection tube is fixedly connected at its end with a corresponding opening in the flange 2 by means of a not shown in the drawing, formed in a manner known in principle fastening device with a pin and a screwed into the flange 2 screw. The suction pipe is formed according to the injection pipe and secured to the flange 2 by a second fastening device, wherein, however, the diameter of the suction pipe, in particular the inner diameter due to the larger volume flow, which must be removed, is greater than that of the injection pipe.

Der Flansch 2 ist im Wesentlichen quaderförmig ausgebildet. Die Durchführung 3a im Flansch 2 für die Zuführung des Kältemittel zum Wärmeübertrager 1 ist ausgehend von einer Bohrung in einem schräg auf der Unterseite des Flansches 2 verlaufenden Kanal (siehe Fig. 8) weitergeführt, welcher durch die Verteilerplatte 7 geschlossen ist und im Bereich der Öffnung 8a endet. Der Kanalverlauf ist durch die Ausgestaltung der Kältemittelzuführung bedingt. Die Kältemittelabführung erfolgt über die als Bohrung mit verschiedenen Durchmesseränderungen ausgebildete Durchführung 3b. Prinzipiell kann - bei entsprechender Ausgestaltung und Anordnung des Einspritzrohrres - für die Durchführung 3a auch eine einfache Bohrung, wie für die Kältemittelabführung (Durchführung 3b) vorgesehen sein.The flange 2 is formed substantially cuboid. The passage 3 a in the flange 2 for the supply of the refrigerant to the heat exchanger 1 is starting from a bore in an obliquely extending on the underside of the flange 2 channel (see Fig. 8 ), which is closed by the distributor plate 7 and ends in the region of the opening 8a. The channel course is due to the design of the refrigerant supply. The refrigerant discharge takes place via the passage 3b designed as a bore with different diameter changes. In principle, with the appropriate design and arrangement of the injection tube, a simple bore can also be provided for the passage 3a, as for the discharge of the refrigerant (passage 3b).

Im Folgenden wird das Umlenkblech 10 und dessen Funktion im Sammelkasten 5 näher erläutert. Die Funktion des Umlenkblechs 10 ist in erster Linie die Umlenkung des von einem Flachrohr 6 ausströmenden Kältemittels zum benachbarten Flachrohr 6, wobei das Kältemittel zusätzlich gemischt werden soll, damit ein möglichst gleichmäßiges Temperaturprofil vorliegt. Dies erfolgt vorliegend innerhalb der Reihen mit Hilfe der zweireihig angeordneten H-förmigen Öffnungen 15 im Umlenkblech 10, wobei das Kältemittel durch einen Schenkel der H-förmigen Öffnung 15 ein-, durch den Verbindungssteg über- und durch den zweiten Schenkel der H-förmigen Öffnung 15 wieder in das benachbarte U-förmig gebogene Flachrohr 6 ausströmt. An beiden längsseitigen Enden des Umlenkblechs 10 ist jeweils eine langlochartig ausgebildete Öffnung 16 vorgesehen, welche sich in ihrer Länge über beide Reihen von H-förmigen Öffnungen 15 erstreckt und das Kältemittel von einer Reihe in die andere Reihe leitet.In the following, the baffle 10 and its function in the collection box 5 will be explained in more detail. The function of the baffle 10 is primarily the deflection of the effluent from a flat tube 6 refrigerant to the adjacent flat tube 6, wherein the refrigerant is to be mixed in addition, so that a uniform temperature profile is possible. This takes place here within the rows by means of the double row arranged H-shaped openings 15 in the baffle 10, wherein the refrigerant through a leg of the H-shaped opening 15 on, through the connecting web and over the second leg of the H-shaped opening 15 flows out again into the adjacent U-shaped flat tube 6. At both longitudinal ends of the baffle 10 each have a slot-like opening 16 is provided, which extends in length over both rows of H-shaped openings 15 and directs the refrigerant from one row to the other row.

Prinzipiell wäre jedoch auch eine andere Ausgestaltung der Öffnungen 15, insbesondere diejenige der Öffnungen 15, die nur der Umlenkung von einem Flachrohr 6 zum benachbarten Flachrohr 6 und ggf. auch der Ausleitung aus den letzten zwei durchströmten Flachrohren 6 in das Saugrohr dienen, möglich. Auf Grund der in Folge der hohen Drücke erforderlichen Festigkeit ist jedoch eine H-förmige Ausgestaltung besonders vorteilhaft.In principle, however, would also be another embodiment of the openings 15, in particular that of the openings 15, which serve only the deflection of a flat tube 6 to the adjacent flat tube 6 and possibly also the discharge of the last two flow-through flat tubes 6 in the suction pipe, possible. However, due to the strength required by the high pressures, an H-shaped configuration is particularly advantageous.

Die H-förmige Ausgestaltung einer Einspritz-Verteileröffnung 15a, die gegenüber dem Kältemittelauslass der Verteilerplatte 7 angeordnet ist, entspricht vorliegend exakt derjenigen der anderen Öffnungen 15, wobei genau diese Ausgestaltung in Hinblick auf eine gleichmäßige Verteilung des Kältemittels auf die beiden Stränge besonders vorteilhaft ist. Vorliegend ist auch die dem Kältemittelauslass der Verteilerplatte 7 gegenüberliegende Auslassöffnung 15b des Umlenkblechs 10 entsprechend ausgebildet.The H-shaped configuration of an injection distributor opening 15a, which is arranged opposite to the refrigerant outlet of the distributor plate 7, corresponds in the present case exactly to that of the other openings 15, whereby exactly this embodiment is particularly advantageous with regard to a uniform distribution of the refrigerant to the two strands. In the present case, the discharge opening 15b of the deflection plate 10, which is opposite the refrigerant outlet of the distributor plate 7, is likewise designed accordingly.

Die H-Form der Öffnungen 15, 15a und 15b weist abgerundete Kanten in allen Bereichen auf, wobei die mittig angeordneten Enden der Schenkel mit nach außen überstehenden Abrundungen versehen sind, so dass die Schenkelbreite an den Enden etwas vergrößert ist (vgl. Fig. 12). Die Querverbindung weist die doppelte Breite wie die Schenkel auf. Die Schenkelbreite entspricht etwa der Breite der Öffnung der Flachrohre 6, die Schenkeilänge ist entsprechend ausgebildet.The H-shape of the openings 15, 15a and 15b has rounded edges in all areas, wherein the centrally disposed ends of the legs are provided with outwardly projecting rounded portions, so that the leg width is slightly enlarged at the ends (see. Fig. 12 ). The cross-connection has twice the width as the legs. The leg width corresponds approximately to the width of the opening of the flat tubes 6, the tine length is formed accordingly.

Der vorliegende Heckverdampfer weist, wie allgemein üblich, im Verhältnis zu üblichen Verdampfern, wie sie für frontseitige Kraftfahrzeugklimaanlagen verwendet werden, verringerte Abmessungen auf. Während übliche Abmessungen für Frontverdampfer im Bereich von 180 mm bis 310 mm für die Breite, 180 mm bis 260 mm für die Höhe und 40 mm bis 50 mm für die Tiefe liegen, weist der vorliegende Wärmeübertrager eine Breite von 130 mm und eine Höhe von 130 mm bei einer Tiefe von 40 mm auf. Es sind jedoch alle Werte im Bereich von 100 mm bis 160 mm, insbesondere 110 mm bis 150 mm, besonders 120 mm bis 140 mm für Höhe und/oder Breite des Heckverdampfers besonders günstig.The present rear evaporator has, as is common practice, compared to conventional evaporators, as used for front-side motor vehicle air conditioners, reduced dimensions. While conventional front evaporator dimensions range from 180 mm to 310 mm for the width, 180 mm to 260 mm for the height and 40 mm to 50 mm for the depth, the present heat exchanger has a width of 130 mm and a height of 130 mm at a depth of 40 mm. However, all values in the range of 100 mm to 160 mm, in particular 110 mm to 150 mm, especially 120 mm to 140 mm for height and / or width of the rear evaporator are particularly favorable.

Wie aus Fig. 1 und 2 ersichtlich, ist der Sammelkasten 5 unten angeordnet, so dass der Flansch 2 unterhalb des Wärmeübertragers 1 positioniert ist und die Zu- und Ableitung entsprechend von unten bzw. nach unten hin erfolgt. Der Wärmeübertrager 1 ist direkt auf den Fahrzeugboden 20 gesetzt, welcher im Bereich des Flansches 2 eine Öffnung 21 aufweist, durch welche der Flansch 2 ragt. Die Öffnung 21 ist mittels eines zwischen der Verteilerplatte 7 und dem Rand des Fahrzeugbodens 20 angeordneten Dichtelements 22 luftdicht abgedichtet. Um die Öffnung 21 herum ist zur Versteifung eine Rippenstruktur ausgebildet.How out Fig. 1 and 2 can be seen, the collection box 5 is arranged below, so that the flange 2 is positioned below the heat exchanger 1 and the supply and discharge takes place from below or downwards accordingly. The heat exchanger 1 is placed directly on the vehicle floor 20, which in the region of the flange 2 has an opening 21 through which the flange 2 projects. The opening 21 is hermetically sealed by means of a sealing element 22 arranged between the distributor plate 7 and the edge of the vehicle floor 20. Around the opening 21 around a rib structure is formed for stiffening.

In dem Fahrzeuginnenraum, in welchem der Wärmeübertrager 1 angeordnet ist, von der Umwelt abtrennenden Fahrzeugboden 20 ist - neben der Öffnung 21 für den Flansch 2 - ein Kondensatablauf 23 vorgesehen, durch welchen das sich im Wärmeübertrager 1 sammelnde Kondensat nach unten abgeführt werden kann. Der Kondensatablauf 23 ist bis deutlich unterhalb des Flansches 2 verlaufend ausgebildet, d.h. bis unterhalb der Anschlussebene des Einspritz- und Saugrohres.In the vehicle interior, in which the heat exchanger 1 is arranged, separating the vehicle floor 20 from the environment - in addition to the opening 21 for the flange 2 - a condensate drain 23 is provided, through which the condensate collecting in the heat exchanger 1 can be discharged down. The condensate drain 23 is formed to run well below the flange 2, i. to below the connection level of the injection and suction pipe.

Für die Herstellung des Wärmeübertragers 1 wird der Flansch 2 an der Verteilerplatte 7 mit Hilfe einer Noppe 3c (siehe Fig. 8), welche über die Unterseite des Flansches 2 vorsteht und welche in eine in der Verteilerplatte 7 vorgesehenen Befestigungsöffnung 8c (siehe Fig. 14) eingepresst ist, vorfixiert und wird, nachdem das Umlenkblech 10 und die Bodenplatte 11 mit der Verteilerplatte 7 verstemmt und anschließend die Flachrohre 6 samt Wellrippenpaketen montiert sind, im Rahmen des Verlötens des gesamten Wärmeübertragers 1 in einem einzigen Lötvorgang verlötet. Das Anschließen der Rohre und das Befüllen des Kältemittelkreislaufs mit Kältemittel erfolgt erst im Rahmen der Montage in das Fahrzeug. Natürlich können an Stelle einer einzigen Noppe, die mit einer entsprechenden Befestigungsöffnung zusammenwirkt, auch mehrere Noppen und Befestigungsöffnungen vorgesehen sein, insbesondere bevorzugt drei, wobei die Noppen prinzipiell auch an der Verteilerplatte 7 und die Befestigungsöffnungen am Flansch 2 angeordnet sein können oder eine gemischte Ausgestaltung, d.h. Noppen sowohl am Flansch als auch an der Verteilerplatte, möglich ist.For the production of the heat exchanger 1, the flange 2 on the distributor plate 7 by means of a nub 3c (see Fig. 8 ) which projects beyond the underside of the flange 2 and which in a provided in the distributor plate 7 mounting opening 8 c (see Fig. 14 ) is pressed in, prefixed and, after the baffle plate 10 and the bottom plate 11 caulked with the distributor plate 7 and then the flat tubes 6 are mounted together with corrugated fins packages soldered in the context of soldering the entire heat exchanger 1 in a single soldering. The connection of the pipes and the filling of the refrigerant circuit with refrigerant takes place only during the assembly in the vehicle. Of course, instead of a single nub, which interacts with a corresponding attachment opening, several nubs and mounting holes may be provided, in particular preferably three, wherein the nubs in principle also on the Distributor plate 7 and the mounting holes can be arranged on the flange 2 or a mixed configuration, ie nubs on both the flange and on the distributor plate, is possible.

Der Wärmeübertrager gemäß dem zuvor beschriebenen Ausführungsbeispiel ist auf Betriebsdrücke von vorliegend 90 bar, mindestens jedoch 50 bar, ausgelegt (Prüfdruck vorliegend 160 bar), so dass als Kältemittel insbesondere auch R744, also CO2, verwendet werden kann.The heat exchanger according to the embodiment described above is at operating pressures of 90 bar here, but at least 50 bar, designed (test pressure in this case 160 bar), so that in particular R744, ie CO 2 , can be used as a refrigerant.

Claims (15)

  1. A heat exchanger arrangement, in particular for a rear evaporator of a motor vehicle, having at least one heat exchanger which can be flowed through by refrigerant of a refrigerant circuit, and pipes via which refrigerant can be supplied to and discharged from the heat exchanger (1), wherein the heat exchanger (1) is arranged in a vehicle interior which is separated from the environment by a closed wall (20), and wherein at least one flange (2) is arranged in an opening (21) in the wall (20), characterised in that the at least one flange (2) is fixedly mounted on the heat exchanger, the further refrigerant circuit - apart from the part inside the heat exchanger (1) - is formed outside the vehicle interior and the connection points of the pipes to the heat exchanger (1) are arranged outside the vehicle interior by means of the at least one flange (2).
  2. The heat exchanger arrangement according to claim 1, characterised in that the opening (21) is sealed by a sealing element (22) inserted between the heat exchanger (1) and the wall.
  3. The heat exchanger arrangement according to claim 1 or 2, characterised in that the wall is formed by the vehicle floor (20).
  4. The heat exchanger arrangement according to one of the preceding claims, characterised in that the opening (21) is arranged adjacent to a condensate drain (23) for the condensate collected in the heat exchanger (1).
  5. The heat exchanger arrangement according to one of the preceding claims, characterised in that CO2 is provided as a refrigerant in the refrigerant circuit.
  6. The heat exchanger arrangement according to one of the preceding claims, characterised in that the flange (2) and/or the heat exchanger (1) have at least one stud (3c) which is attached in a recess or opening (8c) of the heat exchanger (1) or the flange (2).
  7. The heat exchanger arrangement according to one of the preceding claims, characterised in that the flange (2) is fixedly soldered to the heat exchanger (1).
  8. The heat exchanger arrangement according to one of the preceding claims, characterised in that the flange (2) is arranged on a collector or distributor box (5) on the bottom of the heat exchanger.
  9. The heat exchanger arrangement according to claim 8, characterised in that the collector or distributor box (5) of the heat exchanger (1) is formed by at least one bottom plate with refrigerant passage openings in which flat tubes end, a baffle which deflects at least one refrigerant flow, and at least one distributor plate on which the flange(s) are attached.
  10. The heat exchanger arrangement according to claim 9, characterised in that an injection distributor opening (15a) which borders an injection opening (8a) is H-shaped in the baffle.
  11. The heat exchanger arrangement according to claim 9 or 10, characterised in that the baffle (10) has several H-shaped openings (15) for deflecting the refrigerant flow from one tube to the adjacent tube.
  12. The heat exchanger arrangement according to one of claims 9 to 11, characterised in that the baffle (10) has a H-shaped refrigerant outlet opening (15b).
  13. The heat exchanger arrangement according to one of the preceding claims, characterised in that the heat exchanger (1) is formed in two rows.
  14. The heat exchanger arrangement according to one of the preceding claims, characterised in that the injection distributor opening (15a) - as seen in the flow direction of the air flowing through the heat exchanger (1) - is arranged in the last row of tubes.
  15. The heat exchanger arrangement according to one of the preceding claims, characterised in that exactly one outlet opening (15b) is provided, which - as seen in the flow direction of the air flowing through the heat exchanger (1) - is arranged in the first row of tubes.
EP07000561.6A 2006-01-31 2007-01-11 Heat exchanger assembly, in particular of a rear evaporator in a motor vehicle Active EP1816426B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006004710A DE102006004710A1 (en) 2006-01-31 2006-01-31 Heat transfer unit especially for a motor vehicle rear evaporator receives flow from coolant circuit and lies within inner space separated from surroundings by closed wall with flange connection points

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EP1816426A1 EP1816426A1 (en) 2007-08-08
EP1816426B1 true EP1816426B1 (en) 2017-07-26

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DE102010048627A1 (en) * 2010-10-15 2012-04-19 Audi Ag Decoupling element for connecting e.g. engine oil cooler to combustion engine of motor car, has pipe socket arranged on upper aluminum plate and projecting into opening of bottom aluminum plate through passage opening formed in rubber plate

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US5169178A (en) * 1990-06-14 1992-12-08 Modine Manufacturing Co. Fitting for use in a heat exchange system
JP3593434B2 (en) * 1997-02-06 2004-11-24 サンデン株式会社 Heat exchanger unit
DE10104764A1 (en) * 2001-02-02 2002-08-08 Volkswagen Ag Air conditioning unit with branches has one branch in form of flange block
JP4098495B2 (en) * 2001-06-22 2008-06-11 カルソニックカンセイ株式会社 Air conditioner for vehicles
AU2002360056A1 (en) * 2001-12-21 2003-07-09 Behr Gmbh And Co. Heat exchanger, particularly for a motor vehicle
JP3948298B2 (en) * 2002-02-12 2007-07-25 株式会社デンソー Tubular member mounting structure
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EP1816426A1 (en) 2007-08-08

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