EP1711772B1 - Heat exchanger, in particular a flat pipe evaporator for a motor vehicle air conditioning system - Google Patents

Heat exchanger, in particular a flat pipe evaporator for a motor vehicle air conditioning system Download PDF

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Publication number
EP1711772B1
EP1711772B1 EP05707067.4A EP05707067A EP1711772B1 EP 1711772 B1 EP1711772 B1 EP 1711772B1 EP 05707067 A EP05707067 A EP 05707067A EP 1711772 B1 EP1711772 B1 EP 1711772B1
Authority
EP
European Patent Office
Prior art keywords
heat exchanger
collecting tank
rib
flat
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.)
Not-in-force
Application number
EP05707067.4A
Other languages
German (de)
French (fr)
Other versions
EP1711772A1 (en
Inventor
Gottfried DÜRR
Klaus FÖRSTER
Michael Kohl
Emil Neumann
Franz Ott
Wolfgang Seewald
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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Publication date
Application filed by Mahle Behr GmbH and Co KG filed Critical Mahle Behr GmbH and Co KG
Publication of EP1711772A1 publication Critical patent/EP1711772A1/en
Application granted granted Critical
Publication of EP1711772B1 publication Critical patent/EP1711772B1/en
Not-in-force legal-status Critical Current
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
    • F28F9/02—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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/126—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element consisting of zig-zag shaped fins
    • 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
    • F28F2220/00—Closure means, e.g. end caps on header boxes or plugs on conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2265/00—Safety or protection arrangements; Arrangements for preventing malfunction
    • F28F2265/32—Safety or protection arrangements; Arrangements for preventing malfunction for limiting movements, e.g. stops, locking means
    • 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

Definitions

  • the invention relates to a heat exchanger, in particular a flat-tube evaporator for a motor vehicle air conditioning system, according to the preamble of claim 1.
  • a heat exchanger is known with at least one collecting box made of sheet metal and in the bottom of the ends of tubes are inserted and the front side each lid, wherein at least one lid is at least in its outer region formed flat and positively positioned in the collecting box.
  • a heat exchanger in particular an evaporator, known, in which a collection box is provided of sheet metal, which is formed from a prepared board.
  • the board consists of an aluminum alloy, which also consists of the flat tubes, the corrugated fins and the side parts as well as the other elements of the heat exchanger. It is first punched out of a plate, which is then shaped so that a flat bottom (substantially planar collection box part) is formed, connected to the longitudinal edges bent parts (tunnel-shaped collection box parts).
  • the bent parts are bent in a radius to a cylindrical surface, of which the longitudinal edges are folded such that they rest parallel to each other and extend substantially perpendicular to the bottom.
  • the Longitudinal edges are provided with a plurality of tabs distributed over their length, which are inserted through recesses of the bottom and are caulked on the outside of the flat tubes facing. In this way, a collection boxes is formed with the two chambers, which has a relatively high strength, before a soldering occurs.
  • the board is solder plated or provided with a solder coating.
  • passages are provided in the bottom, in which the flat tubes are accommodated.
  • the passages are used up close to the adjoining longitudinal edges. This results in a depth for the heat exchanger, which is only slightly larger than the sum of the depths of the flat tubes.
  • the longitudinal edges of the parts are provided with mutually aligned recesses which are located in the side facing away from the feed and discharge side portion between the transverse wall and the end of the collection chamber.
  • the transverse walls are inserted from the outside into the chambers.
  • slits are provided in the parts or in the bottom.
  • a flat board is first manufactured, in particular by punching, in which the required tabs and the later receiving these tabs openings and recesses are punched. Thereafter, first the longitudinal edges of the parts are bent. Then the passages are incorporated. If the partitions are to be inserted from the bottom in the chambers, so in the manufacture of the passages in the same operation, the passage-like slots are provided for the partitions. If the partitions are to be inserted from the side into the chambers, so the required slots are already incorporated into the planar board. After making the passes, the collection box is finished bending. Then the tabs are caulked.
  • the lids are made as a sheet metal stamping having a corresponding to the contour of the front ends of the collection box encircling, embossed edge.
  • One of the covers in this case has openings for connecting the refrigerant supply and -Ab entry.
  • the edge is provided in the region of the longitudinal edges with a transverse embossing, which is adapted to the sum of the wall thicknesses of the longitudinal edges. Due to the embossed edge creates a step that applies to the inner walls of the collecting tanks when attaching the lid and forms a frictional joint connection. This frictional joint connection is supported by means of several tabs, which connect to the embossed edge and angled at 90 °. These tabs surround the collection boxes on the outside.
  • known standard vaporizers (even with small rib heights) have nearly parallel ribs or a small opening angle between the individual ribs, which due to capillary forces tend to have an unfavorable water storage behavior, i. Store a lot of water locally due to the given geometry.
  • the evaporators may be prone to splash - especially in the case of large quantities of air and small end faces - which in turn limits the permissible rib density (number of rib sections per unit length in the longitudinal direction of the tubes).
  • the risk of splashing is greater, the more condensate accumulates in the individual rib windings or the lower the surface is free to flow through the air.
  • One object is in particular an improved water separation and / or a reduction of the water storage capacity. This object is achieved by a heat exchanger having the features of claim 1.
  • Advantageous embodiments are the subject matter of the subclaims.
  • a heat exchanger is provided, with at least one collecting box made of sheet metal, which is divided in the longitudinal direction at least into two chambers and in the bottom of the ends of tubes, in particular of flat tubes, are introduced, and the collecting box a tunnel-shaped collection box part, a substantially level collection box part, which forms the bottom, and the front side each having lids, wherein at least one lid is at least in its outer edge region formed flat and positively positioned in the collection box. Due to the planar design of the lid, a simple production of the same by means of punching from a sheet, as well as a simple fitting. The lids take up less space compared to the conventional, deep-drawn lids, so that the heat exchanger is smaller builds Rather, for the closed end faces of the heat exchanger, a sheet can be used, which at least substantially corresponds to the partition plates.
  • the positive positioning in the collecting box ensures optimal soldering.
  • the lid is inserted from the front side, wherein it rests Sammelkasten metal on several stops, which are formed on the tunnel-shaped collection box part and / or on the flat collection box part and as a stop pin by means of embossing.
  • the lid is preferably secured by means of a plurality of bent tabs, wherein the tabs are spaced from the stops such that the lid is received as possible clearance between them.
  • the tabs may be bent about an axis parallel to the longitudinal axis of the header. Alternatively, they may be bent from outside to inside.
  • the cover has a thickness, at least in the area located in contact with the collection box, of about 1 to 2 mm, preferably 1.5 mm. Due to the positive positioning before soldering results in an improved lid-tightness. In addition, process reliability can be increased so that fewer faulty heat exchangers are produced.
  • the tabs are preferably part of the tunnel-shaped collection box part and / or the flat collection box part, wherein they are formed by punched-out slots in the corresponding collection box part forming board integral therewith.
  • the cover preferably has in the case of an end-side refrigerant supply and / or -Ab Entry an opening whose edge is bent outwards.
  • the opening is preferably formed circular, in particular as a passage, whereby a different type of training, in particular an oval design, the opening is possible so that the surface of the lid can be optimally utilized, with maximum Strömungsfilkiee.
  • the opening is preferably conical, in particular with an angle of the edge to the longitudinal axis of the passage of a maximum of 5 °, particularly preferably from 2 ° to 3 °, so that the self-locking is ensured.
  • a suction tube is provided, which is attached to the lid with an opening having an inner diameter which corresponds approximately to the outer diameter of the opening delimiting edge, wherein the suction tube is pushed over the passage.
  • An injection pipe which is attached to the cover with an opening, preferably has an outer diameter which corresponds approximately to the smallest inner diameter of the opening delimiting edge.
  • the edge of the collection box plate for the lid preferably has an insertion bevel, which may be formed as bevel but also rounded.
  • the two tunnel-shaped collection box parts preferably have a substantially semicircular shape, which has a positive effect on the strength properties of the collecting box, so that the material thickness - compared to conventional headers - can be preferably reduced, in particular to wall thicknesses of about 0.8 mm with an attachment of injection and suction pipe from one of the front sides (by two lids), or at the longitudinal attachment of the same via a connection gutter in the region of the collecting tank of about 1 mm.
  • the flat tubes used preferably have a width of 2 to 3 mm, making them narrower than conventional flat tubes.
  • the heat exchanger is dependent on the block width 4- or Mehrflutig, in particular 6-flow through.
  • a heat exchanger has flat tubes and corrugated ribs, wherein the corrugated ribs have a rib height which corresponds to the spacing of two flat tubes, and two rib sections connected by a rib bend are inclined to each other at an opening angle ⁇ .
  • a rib height of 3 to 6 mm, preferably of 4 to 5 mm, and a rib density of 50 to 90 ribs, preferably from 60 to 80 ribs, particularly preferably 70 ribs, per 100 mm results in an enlarged angle between the individual ribs (with the same rib density and the same radius of curvature).
  • the opening angle of at least two rib sections is preferably 22 ° +/- 7 ° or 30 ° +/- 10 °.
  • a further enlargement of the opening angle may be achievable if one or more ribbed arches at least in some areas have a radius of curvature of less than 0.4 mm, preferably less than or equal to 0.35 mm, particularly preferably less than or equal to 0.3 mm.
  • a width of the flat tubes of approximately 1.5 to 3 mm is advantageous.
  • Capillary action in the fin turns is reduced by a smaller fin height, or larger fin opening angle, so that less condensate is retained in the fin turns. Associated with it a lower storable amount of water and possibly a better water flow and possibly a lower risk of splashing.
  • a smaller rib height leads to a distribution of the condensate on more ribs and tubes (more heat exchange surface), so that less condensate per Rippenwindung accumulates. This in turn results in a lower risk of splashing and possibly a more favorable flow behavior along the tubes and / or the ribs.
  • Indirect benefits may include a higher allowable rib density and thus an increased performance potential, a lower risk of bacterial growth and thus a reduced odor and possibly a cost savings through simpler surface treatment, which may even be completely eliminated.
  • a reduction of a so-called flash fog danger (sudden misting of windshields due to moisture from the evaporator) by faster drying of the evaporator surface is possible.
  • Such a heat exchanger is used in particular as a flat tube evaporator for a motor vehicle air conditioning.
  • a flat-tube evaporator 1 (only partially shown) of a motor vehicle air conditioner, as previously with reference to the DE 198 26 881 A1 described, two header boxes 2, flat tubes (not shown) extending between the two header boxes 2, and corrugated fins 3, which are arranged between the flat tubes.
  • Each collection box 2 is formed according to the embodiment of a board which is punched out of a metal sheet and then shaped so that a flat collection box part 4 and at the longitudinal edges then two tunnel-shaped collection box parts 5 are formed (see in particular FIGS. 4 and 6 ).
  • the longitudinal edges are provided with a plurality of distributed over the length arranged tabs, which are inserted through recesses of the flat collection box part 4 and are caulked on the flat tubes facing the outside.
  • the front ends are closed by means of covers 6 described in more detail below.
  • a plurality of passages 7 are formed, in which the flat tubes are guided, wherein the opening of the passages 7 substantially corresponds to the outer shape of the flat tubes.
  • the two tunnel-shaped collection box parts 5 have due to a relatively small depth on a substantially semicircular shape, such as the representation of Fig. 7 can be removed. Due to the improved strength properties as a result of the semicircular Shape of the collection box parts 5 and / or the smaller installation depth wall thicknesses of 0.8 to 1 mm, in contrast to the usual wall thicknesses of 1.2 to 1.5 mm possible.
  • one or more partitions 8 are provided, through which the flow path for a fluid such as the refrigerant through the heat exchanger, in particular its flat tubes can be predetermined.
  • the partitions 8 are preferably inserted through slots 9 in a flat collection box part 4, wherein the partitions 8 each between two openings or passages 7 for the tubes, such as flat tubes, are arranged and the distance of the passages 7 by the partitions 8 preferably not changed is.
  • a guide element such as a guide, for example. With a depth of 0.2 to 0.3 mm, to a guide of the partition wall 8 provided (see Fig. 11 ).
  • each cover 6 in the flat collection box part 4 only one stop 10 and offset this two tabs 11 is provided, but according to a variant not shown in the drawing also a the tunnel-shaped collection box part 5 corresponding design possible.
  • the tabs 11 are viewed from the stops 10 in the longitudinal direction of the header 2 to the thickness of the lid 6 forming sheet spaced from each other, so that an exact positioning as a result of a positive connection before soldering is possible.
  • the tabs 11 are bent about an axis which is parallel to the collection box longitudinal axis. According to a variant not shown in the drawing, bending of the tabs towards the cover is also possible, so that only two tabs each extending in the longitudinal direction of the collecting box need to be provided in the blank. Further, according to another variant not shown in the drawing, the limitation of the insertion of the lid may be limited by the respective first passage for the flat tubes, so that only in the tunnel-shaped collection box part stops must be provided and the total length of the collecting tank are optimally utilized can.
  • the refrigerant supply and discharge takes place as Fig. 10 can be removed, via an attached to each one provided with an opening 12 cover 6 injection pipe 13 and a suction pipe 14.
  • Die ⁇ réelle 12 der Lid 6 are formed in the corresponding punched sheet metal part as passages, wherein the cover 6 are installed in the collecting box 2 such that the edges of the passage each protrude outward.
  • the output sheet thickness of the cover 6, ie, the thickness of the unprocessed sheet is about 1.5 mm, to ensure a secure solder joint on the narrow sides and a sufficient material thickness for the passages, so that a sufficient. large connection surface and thus a secure connection between the pipes for the refrigerant supply and - discharge and the passages can be ensured.
  • the cover 6 without draft at least in their outer, adjacent to the board of the header box 2 border areas flat.
  • the passage for the injection tube 13 is formed such that the injection tube 13 is inserted into the opening 12 up to the height of the stops 10.
  • the passage of the lid 6 has a slightly conical, over the length of the passage to the outside tapered inner diameter.
  • the passage for the suction tube 14 has an outwardly tapering outer diameter, wherein the slightly expanded at its end suction pipe 14 is pushed from the outside.
  • the slope is at both openings 12 preferably 2-3 °, but not more than 5 °.
  • five-chambered flat tubes are used, in particular with a width of about 2.5 mm, wherein the web spacing remains unchanged, so that the air-side pressure drop does not increase or only marginally, compared with known evaporators with normal depth.
  • the flow through the evaporator can take place, for example, 6-fold or, in particular in the case of small block widths, 4-pass.
  • Fig. 13 is the rib geometry (opening angle ⁇ between adjacent rib portions 101 which are connected to each other via a rib bow 102) at 8 mm ( Fig. 13a ) and 4 , 5 mm rib height ( Fig. 13b ), in each case at 60 ribs per 100 mm, shown in comparison.
  • Fig. 13b is a rib bow 102 having a smaller radius of curvature (as compared to FIG Fig. 13a ).
  • a radius of curvature in each point of the rib bow 102 may be different and thus other symmetrical or asymmetrical shapes of the rib bow 102 are possible in addition to a circular arc-shaped cross section.
  • Fig. 14 shows the stored amounts of water as a function of the heat exchange surface of proven heat exchangers, wherein the fin height 1 is greater than the fin height 2 and the fin height 2 is greater than the fin height 3.
  • the values were determined by means of a simple screening test, in which first the evaporators are immersed in a water bath and, after removal after a certain dripping time, the remaining amount of water remaining in the evaporator is determined by weighing.
  • Fig. 15 are the stored on the heat exchange surface stored amounts of water as a function of the rib height shown, the rib height decreases to the right. The values were determined during operation at a given operating point.
  • Fig. 16 the critical air volumes are plotted above the rib height, starting from which a spraying of the respective evaporator starts (values likewise determined during operation).
  • the rib height here increases to the right.
  • the opening angle ⁇ is about 14 ° (at 60 fins per 100 mm), or lower.
  • angles of approx. 28 ° can be achieved (again with 60 ribs per 100 mm) (cf. Fig. 13 ). If the radii of curvature of the ribbed curves 102 are not yet executed, the opening angle can be further increased.
  • rib densities are also allowed, which in turn have a positive effect on performance, although this somewhat reduces the opening angle.
  • the resulting angle at a 6 mm high rib is between 15 ° and 22 ° (evaporator with 6 mm high rib also already show a much better drainage and storage behavior as evaporator mti 8 mm high rib, here is also the number of drainage surfaces or flat tubes already higher).
  • the water separation is also favored by a larger available drainage surface along the flat tubes or by the larger number of drainage surfaces / flat tubes with a comparable amount of condensate.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Geometry (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Description

Die Erfindung betrifft einen Wärmetauscher, insbesondere einen Flachrohr-Verdampfer für eine Kraftfahrzeug-Klimaanlage, gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a heat exchanger, in particular a flat-tube evaporator for a motor vehicle air conditioning system, according to the preamble of claim 1.

Aus der DE 197 19 251 A1 und der EP 0 671 597 A1 ist ein Wärmeübertrager bekannt mit wenigstens einem Sammelkasten aus Blech und in dessen Boden die Enden von Rohren eingeführt sind und stirnseitig jeweils Deckel aufweist, wobei mindestens ein Deckel zumindest in seinem äußeren Bereich eben ausgebildet und formschlüssig im Sammelkasten positioniert ist.From the DE 197 19 251 A1 and the EP 0 671 597 A1 a heat exchanger is known with at least one collecting box made of sheet metal and in the bottom of the ends of tubes are inserted and the front side each lid, wherein at least one lid is at least in its outer region formed flat and positively positioned in the collecting box.

Aus der DE 101 32 485 A1 ist noch ein Wärmeübertrager bekannt, der Rohre aufweist, die in einen Sammelkasten münden. Der Sammelkasten ist am Ende seiner Längserstreckung mittels Abschlußdeckeln geschlossen.From the DE 101 32 485 A1 is still a heat exchanger known which has pipes that open into a collection box. The collecting box is closed at the end of its longitudinal extension by means of end caps.

Aus der DE 198 26 881 A1 ist ein Wärmeübertrager, insbesondere ein Verdampfer, bekannt, bei dem ein Sammelkasten aus Blech vorgesehen ist, der aus einer vorbereiteten Platine geformt ist.From the DE 198 26 881 A1 is a heat exchanger, in particular an evaporator, known, in which a collection box is provided of sheet metal, which is formed from a prepared board.

Die Platine besteht aus einer Aluminium-Legierung, aus welcher auch die Flachrohre, die Wellrippen und die Seitenteile sowie die übrigen Elemente des Wärmeübertragers bestehen. Sie wird zunächst aus einer Platte ausgestanzt, die dann so geformt wird, dass ein ebener Boden (im Wesentlichen ebener Sammelkasten-Teil) gebildet wird, an dessen Längskanten abgebogene Teile (tunnelförmige Sammelkasten-Teile) anschließen. Die abgebogenen Teile sind in einem Radius zu einer Zylinderfläche gebogen, von der die Längsränder derart abgekantet sind, dass sie parallel zueinander aneinander anliegen und im Wesentlichen senkrecht zu dem Boden verlaufen. Die Längsränder sind mit mehreren, über ihre Länge verteilt angeordneten Laschen versehen, die durch Aussparungen des Bodens hindurchgesteckt sind und auf der den Flachrohren zugewandten Außenseite verstemmt sind. Auf diese Weise wird ein Sammelkästen mit den beiden Kammern gebildet, der eine relativ hohe Festigkeit aufweist, bevor ein Verlöten erfolgt. Die Platine ist lotplattiert oder mit einer Lotbeschichtung versehen.The board consists of an aluminum alloy, which also consists of the flat tubes, the corrugated fins and the side parts as well as the other elements of the heat exchanger. It is first punched out of a plate, which is then shaped so that a flat bottom (substantially planar collection box part) is formed, connected to the longitudinal edges bent parts (tunnel-shaped collection box parts). The bent parts are bent in a radius to a cylindrical surface, of which the longitudinal edges are folded such that they rest parallel to each other and extend substantially perpendicular to the bottom. The Longitudinal edges are provided with a plurality of tabs distributed over their length, which are inserted through recesses of the bottom and are caulked on the outside of the flat tubes facing. In this way, a collection boxes is formed with the two chambers, which has a relatively high strength, before a soldering occurs. The board is solder plated or provided with a solder coating.

In dem Boden sind jeweils Durchzüge vorgesehen, in denen die Flachrohre aufgenommen werden. Jeweils im Bereich der Längskanten des Bodens, von welchem die Teile abgebogen sind, sind die Durchzüge bis dicht an die aneinander anliegenden Längsränder herangezogen. Dadurch ergibt sich eine Tiefe für den Wärmeübertrager, die nur geringfügig größer als die Summe der Tiefen der Flachrohre ist. Die Längsränder der Teile sind mit miteinander fluchtenden Aussparungen versehen, die sich in dem der Zuführ- und Abführseite abgewandten Abschnitt zwischen der Querwand und dem Ende der Sammelkammer befinden. Die Querwände werden von außen in die Kammern eingeschoben. Hierfür sind Schlitze in den Teilen oder im Boden vorgesehen.In each case passages are provided in the bottom, in which the flat tubes are accommodated. In each case in the region of the longitudinal edges of the floor, from which the parts are bent, the passages are used up close to the adjoining longitudinal edges. This results in a depth for the heat exchanger, which is only slightly larger than the sum of the depths of the flat tubes. The longitudinal edges of the parts are provided with mutually aligned recesses which are located in the side facing away from the feed and discharge side portion between the transverse wall and the end of the collection chamber. The transverse walls are inserted from the outside into the chambers. For this purpose, slits are provided in the parts or in the bottom.

Bei der Herstellung des Sammelkastens wird zunächst eine ebene Platine gefertigt, insbesondere durch Ausstanzen, in der die benötigten Laschen sowie die später diese Laschen aufnehmenden Öffnungen sowie Aussparungen eingestanzt werden. Danach werden zunächst die Längsränder der Teile abgebogen. Anschließend werden die Durchzüge eingearbeitet. Wenn die Trennwände von dem Boden her in die Kammern eingefügt werden sollen, so werden bei dem Fertigen der Durchzüge im gleichen Arbeitsgang auch die durchzugartigen Schlitze für die Trennwände vorgesehen. Wenn die Trennwände von der Seite her in die Kammern eingeschoben werden sollen, so werden die dafür benötigten Schlitze bereits in die ebene Platine eingearbeitet. Nach dem Fertigen der Durchzüge wird der Sammelkasten fertig gebogen. Anschließend werden die Laschen verstemmt.In the production of the header box, a flat board is first manufactured, in particular by punching, in which the required tabs and the later receiving these tabs openings and recesses are punched. Thereafter, first the longitudinal edges of the parts are bent. Then the passages are incorporated. If the partitions are to be inserted from the bottom in the chambers, so in the manufacture of the passages in the same operation, the passage-like slots are provided for the partitions. If the partitions are to be inserted from the side into the chambers, so the required slots are already incorporated into the planar board. After making the passes, the collection box is finished bending. Then the tabs are caulked.

Vor dem Verlöten des mit den Flachrohren und den Wellrippen und den Seitenteilen versehenen Wärmeübertragers werden die Stirnenden der Sammelkästen mittels eingefügter Deckel verschlossen. Die Deckel sind als Blechpressteil hergestellt, das einen entsprechend der Kontur der Stirnenden der Sammelkasten umlaufenden, geprägten Rand aufweist. Einer der Deckel weist hierbei Öffnungen zum Anschließen der Kältemittel-Zuführung und -Abführung auf. Der Rand ist im Bereich der Längsränder mit einer Querprägung versehen, die der Summe der Wandstärken der Längsränder angepasst ist. Auf Grund des geprägten Randes entsteht eine Stufe, die sich beim Anbringen der Deckel an die Innenwandungen der Sammelkästen anlegt und eine reibschlüssige Fügeverbindung bildet. Diese reibschlüssige Fügeverbindung wird mittels mehrerer Laschen unterstützt, die an dem geprägten Rand anschließen und um 90° abgewinkelt sind. Diese Laschen umgreifen die Sammelkästen auf der Außenseite.Before soldering the provided with the flat tubes and the corrugated fins and the side panels heat exchanger, the front ends of the headers are closed by means of inserted cover. The lids are made as a sheet metal stamping having a corresponding to the contour of the front ends of the collection box encircling, embossed edge. One of the covers in this case has openings for connecting the refrigerant supply and -Abführung. The edge is provided in the region of the longitudinal edges with a transverse embossing, which is adapted to the sum of the wall thicknesses of the longitudinal edges. Due to the embossed edge creates a step that applies to the inner walls of the collecting tanks when attaching the lid and forms a frictional joint connection. This frictional joint connection is supported by means of several tabs, which connect to the embossed edge and angled at 90 °. These tabs surround the collection boxes on the outside.

Darüberhinaus weisen bekannte Verdampfer bei den standardmäßig üblichen Rippendichten (auch bei kleinen Rippenhöhen) nahezu parallel stehende Rippen bzw. einen kleinen Öffnungswinkel zwischen den einzelnen Rippen auf, die aufgrund von Kapillarkräften zu einem ungünstigen Wasserspeicherungsverhalten tendieren, d.h. viel Wasser aufgrund der gegebenen Geometrie örtlich speichern.Moreover, known standard vaporizers (even with small rib heights) have nearly parallel ribs or a small opening angle between the individual ribs, which due to capillary forces tend to have an unfavorable water storage behavior, i. Store a lot of water locally due to the given geometry.

Bei schlechtem Wasserablauf neigen die Verdampfer unter Umständen zum Spritzen - vor allem bei großer Luftmenge und kleinen Stirnflächen - was wiederum die zulässige Rippendichte (Anzahl von Rippenabschnitten pro Längeneinheit in Längsrichtung der Rohre) begrenzt. Die Gefahr des Spritzens wird umso größer, je mehr Kondensat sich in den einzelnen Rippenwindungen ansammelt bzw. je geringer die von der Luft frei durchströmbare Fläche ist.In the event of poor water drainage, the evaporators may be prone to splash - especially in the case of large quantities of air and small end faces - which in turn limits the permissible rib density (number of rib sections per unit length in the longitudinal direction of the tubes). The risk of splashing is greater, the more condensate accumulates in the individual rib windings or the lower the surface is free to flow through the air.

Ein ungünstiges Wasserspeicherungs- und Ablaufverhalten aufgrund der gegebenen Rippengeometrie weisen beispielsweise Verdampfer mit nahezu parallelen Rippen bzw. kleinen Öffnungswinkeln zwischen den einzelnen Rippenabschnitten auf. Insbesondere dann ist die Strömungsgeschwindigkeit bzw. Luftmenge begrenzt, bis zu der ein Spritzen noch vermeidbar ist.An unfavorable water storage and drainage behavior due to the given rib geometry, for example, evaporator with almost parallel ribs or small opening angles between the individual rib sections. In particular, then the flow rate or amount of air is limited to a syringe is still avoidable.

Es ist Aufgabe der Erfindung, einen verbesserten Wärmetauscher zur Verfügung zu stellen. Eine Aufgabe ist insbesondere eine verbesserte Wasserabscheidung und/oder eine Verringerung des Wasserspeichervermögens Diese Aufgabe wird gelöst durch einen Wärmetauscher mit den Merkmalen des Anspruchs 1 Vorteilhafte Ausgestaltungen sind Gegenstand der Unteransprüche.It is an object of the invention to provide an improved heat exchanger. One object is in particular an improved water separation and / or a reduction of the water storage capacity. This object is achieved by a heat exchanger having the features of claim 1. Advantageous embodiments are the subject matter of the subclaims.

Erfindungsgemäß ist ein Wärmetauscher vorgesehen, mit wenigstens einem Sammelkasten aus Blech, der in Längsrichtung wenigstens in zwei Kammern unterteilt ist und in dessen Boden die Enden von Rohren, insbesondere von Flachrohren, eingeführt sind, und der Sammelkasten einen tunnelförmigen Sammelkasten-Teil, einen im Wesentlichen ebenen Sammelkasten-Teil, der den Boden bildet, und stirnseitig jeweils Deckel aufweist, wobei mindestens ein Deckel zumindest in seinem äußeren Randbereich eben ausgebildet und formschlüssig im Sammelkasten positioniert ist. Durch die ebene Ausbildung des Deckels ermöglicht sich eine einfache Herstellung desselben mittels Stanzens aus einem Blech, sowie eine einfache Einpassung. Die Deckel nehmen weniger Raum ein, verglichen mit den herkömmlichen, tiefgezogenen Deckeln, so dass der Wärmetauscher kleiner baut Vielmehr kann für die geschlossenen Stirnseiten des Wärmetauschers ein Blech verwendet werden, das zumindest im Wesentlichen den Trennwand-Blechen entspricht.According to the invention, a heat exchanger is provided, with at least one collecting box made of sheet metal, which is divided in the longitudinal direction at least into two chambers and in the bottom of the ends of tubes, in particular of flat tubes, are introduced, and the collecting box a tunnel-shaped collection box part, a substantially level collection box part, which forms the bottom, and the front side each having lids, wherein at least one lid is at least in its outer edge region formed flat and positively positioned in the collection box. Due to the planar design of the lid, a simple production of the same by means of punching from a sheet, as well as a simple fitting. The lids take up less space compared to the conventional, deep-drawn lids, so that the heat exchanger is smaller builds Rather, for the closed end faces of the heat exchanger, a sheet can be used, which at least substantially corresponds to the partition plates.

Die formschlüssige Positionierbarkeit im Sammelkasten stellt eine optimale Verlötung sicher.The positive positioning in the collecting box ensures optimal soldering.

Der Deckel ist von der Stirnseite her eingeführt, wobei er sammelkastenseitig an mehreren Anschlägen anliegt, die am tunnelförmigen Sammelkasten-Teil und/oder am ebenen Sammelkasten-Teil und als Anschlagzapfen mittels Prägen ausgebildet sind.The lid is inserted from the front side, wherein it rests Sammelkastenseitig on several stops, which are formed on the tunnel-shaped collection box part and / or on the flat collection box part and as a stop pin by means of embossing.

Auf der Außenseite ist der Deckel bevorzugt mittels mehrerer umgebogener Laschen gesichert, wobei die Laschen von den Anschlägen derart beabstandet sind, dass der Deckel möglichst spielfrei dazwischen aufgenommen ist. Die Laschen können um eine parallel zur Längsachse des Sammelkastens verlaufende Achse gebogen sein. Alternativ können sie von außen nach innen umgebogen sein. Um eine sichere Verlötung zu gewährleisten, weist der Deckel eine Dicke, zumindest im sich in Anlage an den Sammelkasten befindlichen Bereich, von ca. 1 bis 2 mm, bevorzugt 1,5 mm auf. Durch die formschlüssige Positionierung vor dem Verlöten ergibt sich eine verbesserte Deckel-Dichtheit. Zudem lässt sich die Prozesssicherheit erhöhen, so dass weniger fehlerhafte Wärmetauscher produziert werden.On the outside, the lid is preferably secured by means of a plurality of bent tabs, wherein the tabs are spaced from the stops such that the lid is received as possible clearance between them. The tabs may be bent about an axis parallel to the longitudinal axis of the header. Alternatively, they may be bent from outside to inside. In order to ensure a secure soldering, the cover has a thickness, at least in the area located in contact with the collection box, of about 1 to 2 mm, preferably 1.5 mm. Due to the positive positioning before soldering results in an improved lid-tightness. In addition, process reliability can be increased so that fewer faulty heat exchangers are produced.

Die Laschen sind bevorzugt Teil des tunnelförmigen Sammelkasten-Teils und/oder des ebenen Sammelkasten-Teils, wobei sie durch ausgestanzte Schlitze in der den entsprechenden Sammelkasten-Teil bildenden Platine einstückig mit derselben ausgebildet sind.The tabs are preferably part of the tunnel-shaped collection box part and / or the flat collection box part, wherein they are formed by punched-out slots in the corresponding collection box part forming board integral therewith.

Der Deckel weist bevorzugt im Falle einer stirnseitigen Kältemittel-Zu- und/oder -Abführung eine Öffnung auf, deren Rand nach außen gebogen ist. Die Öffnung ist bevorzugt kreisförmig ausgebildet, insbesondere als Durchzug, wobei auch eine andersartige Ausbildung, insbesondere eine ovale Ausbildung, der Öffnung möglich ist, so dass die Fläche des Deckels optimal ausgenutzt werden kann, bei maximaler Strömungsfiläche.The cover preferably has in the case of an end-side refrigerant supply and / or -Abführung an opening whose edge is bent outwards. The opening is preferably formed circular, in particular as a passage, whereby a different type of training, in particular an oval design, the opening is possible so that the surface of the lid can be optimally utilized, with maximum Strömungsfiläche.

Die Öffnung ist bevorzugt konisch ausgebildet, insbesondere mit einem Winkel des Randes zur Längsachse des Durchzugs von maximal 5°, insbesondere bevorzugt von 2° bis 3°, so dass die Selbsthemmung gewährleistet ist.The opening is preferably conical, in particular with an angle of the edge to the longitudinal axis of the passage of a maximum of 5 °, particularly preferably from 2 ° to 3 °, so that the self-locking is ensured.

Bevorzugt ist ein Saugrohr vorgesehen, das an dem Deckel mit einer Öffnung angebracht ist, das einen Innendurchmesser aufweist, der etwa dem Außendurchmesser des die Öffnung eingrenzenden Randes entspricht, wobei das Saugrohr über den Durchzug geschoben ist. Dies ermöglicht einen gleichbleibenden und sich in Strömungsrichtung leicht erweiternden Strömungsquerschnitt, so dass dieser größtmöglich ausgebildet und der kältemittelseitige Druckabfall möglichst gering gehalten werden kann. Dadurch kann die Verdampferleistung erhöht werden.Preferably, a suction tube is provided, which is attached to the lid with an opening having an inner diameter which corresponds approximately to the outer diameter of the opening delimiting edge, wherein the suction tube is pushed over the passage. This allows a constant and slightly widening in the flow direction flow cross section, so that this largest possible and the refrigerant side pressure drop can be kept as low as possible. As a result, the evaporator performance can be increased.

Ein Einspritzrohr, das an dem Deckel mit einer Öffnung angebracht ist, weist vorzugsweise einen Außendurchmesser auf, der etwa dem kleinsten Innendurchmesser des die Öffnung eingrenzenden Randes entspricht.An injection pipe, which is attached to the cover with an opening, preferably has an outer diameter which corresponds approximately to the smallest inner diameter of the opening delimiting edge.

Zur Erleichterung des Einführens der Deckel weist der Rand des Sammelkasten-Blechs für die Deckel vorzugsweise eine Einführschräge auf, wobei diese als Fase aber auch abgerundet ausgebildet sein kann.To facilitate the insertion of the lid, the edge of the collection box plate for the lid preferably has an insertion bevel, which may be formed as bevel but also rounded.

Die beiden tunnelförmigen Sammelkasten-Teile weisen bevorzugt eine im Wesentlichen halbkreisförmige Gestalt auf, welche sich positiv auf die Festigkeitseigenschaften des Sammelkastens auswirken, so dass die Materialstärke - verglichen mit herkömmlichen Sammelkästen - vorzugsweise verringert werden kann, insbesondere auf Wandstärken von ca. 0,8 mm bei einer Anbringung von Einspritz- und Saugrohr von einer der Stirnseiten her (durch zwei Deckel), oder bei längsseitiger Anbringung derselben über einen Anschlusserker im Bereich des Sammelkastens von ca. 1 mm. Durch die Verringerung der Blechstärke ergibt sich eine Material- und Gewichtsersparnis, so dass die Herstellungskosten und die späteren Betriebskosten gesenkt werden können.The two tunnel-shaped collection box parts preferably have a substantially semicircular shape, which has a positive effect on the strength properties of the collecting box, so that the material thickness - compared to conventional headers - can be preferably reduced, in particular to wall thicknesses of about 0.8 mm with an attachment of injection and suction pipe from one of the front sides (by two lids), or at the longitudinal attachment of the same via a connection gutter in the region of the collecting tank of about 1 mm. By reducing the thickness of the sheet results in a material and weight savings, so that the manufacturing cost and the subsequent operating costs can be reduced.

Die verwendeten Flachrohre weisen bevorzugt eine Breite von 2 bis 3 mm auf, womit sie schmäler als herkömmliche Flachrohre ausgebildet sind.The flat tubes used preferably have a width of 2 to 3 mm, making them narrower than conventional flat tubes.

Der Wärmetauscher ist abhängig von der Blockbreite 4- oder mehrflutig, insbesondere 6-flutig durchströmbar.The heat exchanger is dependent on the block width 4- or Mehrflutig, in particular 6-flow through.

Gemäß eines weiteren Aspekts der vorliegenden Erfindung weist ein Wärmetauscher Flachrohre und Wellrippen auf, wobei die Wellrippen eine Rippenhöhe aufweisen, die dem Abstand jeweils zweier Flachrohre entspricht, und wobei jeweils zwei über einen Rippenbogen verbundene Rippenabschnitte unter einem Öffnungswinkel α zueinander geneigt sind. Bei einer Rippenhöhe von 3 bis 6 mm, bevorzugt von 4 bis 5 mm, und einer Rippendichte von 50 bis 90 Rippen, bevorzugt von 60 bis 80 Rippen, besonders bevorzugt 70 Rippen, je 100 mm, ergibt sich gemäß der vorliegenden Erfindung ein vergrößerter Winkel zwischen den einzelnen Rippen (bei gleicher Rippendichte und gleichem Krümmungsradius). Aufgrund dieses größeren Öffnungswinkels der Rippen wird eine kleinere Kapillarwirkung in den Rippenwindungen erzielt, was zu einem besseren Kondenswasser-Ablaufverhalten bzw. einer geringeren gespeicherten Wassermenge lokal in den Rippenwindungen und somit auch im Verdampfer insgesamt führt sowie gegebenenfalls die Spritzgefahr des Verdampfers reduziert. Der Öffnungswinkel zumindest zweier Rippenabschnitte, bevorzugt vieler oder aller Rippenabschnitte, beträgt dabei bevorzugt 22° +/- 7° oder 30° +/- 10°.According to a further aspect of the present invention, a heat exchanger has flat tubes and corrugated ribs, wherein the corrugated ribs have a rib height which corresponds to the spacing of two flat tubes, and two rib sections connected by a rib bend are inclined to each other at an opening angle α. With a rib height of 3 to 6 mm, preferably of 4 to 5 mm, and a rib density of 50 to 90 ribs, preferably from 60 to 80 ribs, particularly preferably 70 ribs, per 100 mm, according to the present invention results in an enlarged angle between the individual ribs (with the same rib density and the same radius of curvature). Due to this larger opening angle of the ribs, a smaller capillary action is achieved in the rib turns, resulting in a better condensate drainage behavior or a lower amount of stored water locally in the rib turns and thus in the evaporator as a whole and optionally reduces the risk of splashing the evaporator. The opening angle of at least two rib sections, preferably many or all rib sections, is preferably 22 ° +/- 7 ° or 30 ° +/- 10 °.

Eine weitere Vergrößerung des Öffnungswinkels ist unter Umständen erreichbar, wenn ein oder mehrere Rippenbögen zumindest bereichsweise einen Krümmungsradius von kleiner als 0,4 mm, bevorzugt kleiner oder gleich 0,35 mm, besonders bevorzugt kleiner oder gleich 0,3 mm, aufweisen. Vorteilhaft ist dabei eine Breite der Flachrohre von ca. 1,5 bis 3 mm.A further enlargement of the opening angle may be achievable if one or more ribbed arches at least in some areas have a radius of curvature of less than 0.4 mm, preferably less than or equal to 0.35 mm, particularly preferably less than or equal to 0.3 mm. A width of the flat tubes of approximately 1.5 to 3 mm is advantageous.

Durch eine kleinere Rippenhöhe bzw. einen größeren Rippenöffnungswinkel ist eine Kapillarwirkung in den Rippenwindungen verringert, so dass sich weniger Kondensat in den Rippenwindungen hält. Damit verbunden sind eine geringere speicherbare Wassermenge sowie unter Umständen ein besserer Wasserablauf und gegebenenfalls eine geringere Gefahr des Spritzens. Zum anderen führt eine kleinere Rippenhöhe zu einer Verteilung des Kondensats auf mehr Rippen und Rohre (mehr Wärmeaustauschfläche), so dass insgesamt weniger Kondensat je Rippenwindung anfällt. Hieraus ergibt sich wiederum eine geringere Gefahr des Spritzens und unter Umständen ein günstigeres Ablaufverhalten entlang der Rohre und/oder der Rippen.Capillary action in the fin turns is reduced by a smaller fin height, or larger fin opening angle, so that less condensate is retained in the fin turns. Associated with it a lower storable amount of water and possibly a better water flow and possibly a lower risk of splashing. On the other hand, a smaller rib height leads to a distribution of the condensate on more ribs and tubes (more heat exchange surface), so that less condensate per Rippenwindung accumulates. This in turn results in a lower risk of splashing and possibly a more favorable flow behavior along the tubes and / or the ribs.

Mittelbare Vorteile sind möglicherweise eine höhere zulässige Rippendichte und somit ein erhöhtes Leistungspotential, eine geringere Gefahr von Bakterienwachstum und damit eine verringerte Geruchsbildung sowie gegebenenfalls eine Kostenersparnis durch einfachere Oberflächenbehandlung, die unter Umständen sogar ganz entfallen kann. Außerdem ist eine Reduzierung einer sogenannten Flash-Fog-Gefahr (plötzliches Beschlagen von Windschutzscheiben aufgrund von Feuchtigkeit aus dem Verdampfer) durch schnelleres Abtrocknen der Verdampferoberfläche möglich.Indirect benefits may include a higher allowable rib density and thus an increased performance potential, a lower risk of bacterial growth and thus a reduced odor and possibly a cost savings through simpler surface treatment, which may even be completely eliminated. In addition, a reduction of a so-called flash fog danger (sudden misting of windshields due to moisture from the evaporator) by faster drying of the evaporator surface is possible.

Ein derartiger Wärmetauscher wird insbesondere als Flachrohr-Verdampfer für eine Kraftfahrzeug-Klimaanlage verwendet.Such a heat exchanger is used in particular as a flat tube evaporator for a motor vehicle air conditioning.

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

Fig. 1
eine perspektivische Darstellung eines Sammelkastens,
Fig. 2
eine Detailansicht des Sammelkastens von Fig. 1,
Fig. 3
den Sammelkasten von Fig. 1 vor dem Einbau der stirnseitig angebrachten Deckel,
Fig. 4
eine Detailansicht von Fig. 3,
Fig. 5
eine Detailansicht des Sammelkastens von Fig. 1, wobei der rechte der beiden Deckel nicht dargestellt ist,
Fig. 6
eine Fig. 5 entsprechende Detailansicht aus einer anderen Perspektive,
Fig. 7
eine Seitenansicht auf die Deckel,
Fig. 8
einen Schnitt entlang Linie A-A in Fig. 7,
Fig. 9
eine Fig. 8 entsprechende Schnittdarstellung ohne Deckel,
Fig. 10
einen Schnitt durch beide Deckel mit montiertem Saug- und Einspritzrohr,
Fig. 11
einen Schnitt in Längsrichtung des Sammelkastens zur Darstellung einer Trennwand,
Fig. 12a,12b
Ansichten zweier Wellrippbleche, wobei in Fig. 12a eine bekannte Form und in Fig. 12b eine Form für eine größere Flachrohrdichte dargestellt ist,
Fig. 13a,13b
jeweils einen Ausschnitt einer Wellrippe eines Verdampfers in verschiedenen Geometrien,
Fig. 14
die gespeicherte Wassermenge als Funktion der Wärmeaustauschfläche,
Fig. 15
die gespeicherte Wassermenge in Abhängigkeit der Rippenhöhe (im Betrieb bei einem festgelegten Betriebspunkt und bei gleichen Wärmeaustauschflächen), und
Fig. 16
die kritische Luftmenge bezüglich eines Spritzens eines Verdampfers in Abhängigkeit der Rippenhöhe.
In the following the invention with reference to an embodiment with reference to the drawings will be explained in detail. In the drawing show:
Fig. 1
a perspective view of a collecting box,
Fig. 2
a detailed view of the collecting tank of Fig. 1 .
Fig. 3
the collection box of Fig. 1 before installation of the front-mounted cover,
Fig. 4
a detailed view of Fig. 3 .
Fig. 5
a detailed view of the collecting tank of Fig. 1 , wherein the right of the two covers is not shown,
Fig. 6
a Fig. 5 corresponding detail view from a different perspective,
Fig. 7
a side view on the lids,
Fig. 8
a section along line AA in Fig. 7 .
Fig. 9
a Fig. 8 corresponding sectional view without lid,
Fig. 10
a section through both covers with mounted suction and injection pipe,
Fig. 11
a section in the longitudinal direction of the collecting tank to illustrate a partition,
Fig. 12a, 12b
Views of two Wellrippbleche, where in Fig. 12a a known form and in Fig. 12b a mold for a larger flat pipe density is shown,
Fig. 13a, 13b
each a section of a corrugated fin of an evaporator in different geometries,
Fig. 14
the amount of stored water as a function of the heat exchange surface,
Fig. 15
the amount of water stored as a function of the height of the ribs (in operation at a specified operating point and at the same heat exchange surfaces), and
Fig. 16
the critical amount of air with respect to a splash of an evaporator depending on the rib height.

Ein Flachrohr-Verdampfer 1 (nur teilweise dargestellt) einer Kraftfahrzeug-Klimaanlage weist, wie bereits zuvor unter Bezugnahme auf die DE 198 26 881 A1 beschrieben, zwei Sammelkästen 2, Flachrohre (nichtdargestellt), die zwischen den beiden Sammelkästen 2 verlaufen, und Wellrippen 3 auf, die zwischen den Flachrohren angeordnet sind. Jeder Sammelkasten 2 ist gemäß dem Ausführungsbeispiel aus einer Platine gebildet, die aus einem Blech ausgestanzt und dann so geformt ist, dass ein ebenes Sammelkasten-Teil 4 und an dessen Längskanten anschließend zwei tunnelförmige Sammelkasten-Teile 5 ausgebildet sind (siehe insbesondere Figuren 4 und 6). Die Längsränder sind mit mehreren, über deren Länge verteilt angeordneten Laschen versehen, die durch Aussparungen des ebenen Sammelkasten-Teils 4 hindurchgesteckt sind und auf der den Flachrohren zugewandten Außenseite verstemmt sind. Die Stirnenden sind mittels an späterer Stelle näher beschriebenen Deckeln 6 verschlossen.A flat-tube evaporator 1 (only partially shown) of a motor vehicle air conditioner, as previously with reference to the DE 198 26 881 A1 described, two header boxes 2, flat tubes (not shown) extending between the two header boxes 2, and corrugated fins 3, which are arranged between the flat tubes. Each collection box 2 is formed according to the embodiment of a board which is punched out of a metal sheet and then shaped so that a flat collection box part 4 and at the longitudinal edges then two tunnel-shaped collection box parts 5 are formed (see in particular FIGS. 4 and 6 ). The longitudinal edges are provided with a plurality of distributed over the length arranged tabs, which are inserted through recesses of the flat collection box part 4 and are caulked on the flat tubes facing the outside. The front ends are closed by means of covers 6 described in more detail below.

Im ebenen Sammelkasten-Teil 4 sind eine Mehrzahl von Durchzügen 7 ausgebildet, in welche die Flachrohre geführt sind, wobei die Öffnung der Durchzüge 7 im Wesentlichen der Außenform der Flachrohre entspricht.In the flat collection box part 4, a plurality of passages 7 are formed, in which the flat tubes are guided, wherein the opening of the passages 7 substantially corresponds to the outer shape of the flat tubes.

Die beiden tunnelförmigen Sammelkasten-Teile 5 weisen auf Grund einer relativ geringen Bautiefe eine im Wesentlichen halbkreisförmige Gestalt auf, wie beispielsweise der Darstellung von Fig. 7 entnommen werden kann. Auf Grund der verbesserten Festigkeitseigenschaften in Folge der halbkreisförmigen Gestalt der Sammelkasten-Teile 5 und/oder der kleineren Bautiefe sind Wandstärken von 0,8 bis 1 mm im Gegensatz zu den üblichen Wandstärken von 1,2 bis 1,5 mm möglich.The two tunnel-shaped collection box parts 5 have due to a relatively small depth on a substantially semicircular shape, such as the representation of Fig. 7 can be removed. Due to the improved strength properties as a result of the semicircular Shape of the collection box parts 5 and / or the smaller installation depth wall thicknesses of 0.8 to 1 mm, in contrast to the usual wall thicknesses of 1.2 to 1.5 mm possible.

Im Inneren des Sammelkastens 2 sind eine oder mehrere Trennwände 8 vorgesehen, durch welche der Strömungsweg für ein Fluid wie beispielsweise das Kältemittel durch den Wärmetauscher, insbesondere dessen Flachrohre vorgebbar ist. Die Trennwände 8 sind durch Schlitze 9 vorzugsweise in einem ebenen Sammelkasten-Teil 4 einführbar, wobei die Trennwände 8 jeweils zwischen zwei Öffnungen oder Durchzügen 7 für die Rohre, wie Flachrohre, angeordnet sind und der Abstand der Durchzüge 7 durch die Trennwände 8 vorzugsweise nicht verändert ist. Hierfür ist beispielsweise im Sammelkasten 2 in einem Bereich ein Trennwand-Schlitz ausgestanzt oder anderweitig eingebracht, so dass unter Umständen kein Durchzug gebildet ist, und/oder in einem anderen Bereich ein Führungselement, wie eine Führungsnut, bspw. mit einer Tiefe von 0,2 bis 0,3 mm, zu einer Führung der Trennwand 8 vorgesehen (siehe Fig. 11).In the interior of the collecting tank 2, one or more partitions 8 are provided, through which the flow path for a fluid such as the refrigerant through the heat exchanger, in particular its flat tubes can be predetermined. The partitions 8 are preferably inserted through slots 9 in a flat collection box part 4, wherein the partitions 8 each between two openings or passages 7 for the tubes, such as flat tubes, are arranged and the distance of the passages 7 by the partitions 8 preferably not changed is. For this purpose, for example, in the collecting box 2 in a range punched a partition slot or otherwise introduced so that under certain circumstances no draft is formed, and / or in another area a guide element, such as a guide, for example. With a depth of 0.2 to 0.3 mm, to a guide of the partition wall 8 provided (see Fig. 11 ).

Die aus einem Blech bestehenden Deckel 6 sind von der Stirnseite her am Sammelkasten 2 angebracht, wobei sie bis zu durch Anschlagzapfen gebildeten Anschlägen 10, die an der Platine mittels Prägen ausgebildet sind, eingeführt und mittels bei der Herstellung der Platine ausgestanzter und nach dem Positionieren des Deckels 6 umgebogener Laschen 11 verriegelt sind. Zum leichteren Einführen der Deckel 6 sind Einführschrägen an der Platine vorgesehen (siehe etwa über die Hälfte der Platinen-Dicke gehende Fase in Fig. 9). Sowohl die Laschen 11 als auch die Anschläge 10 im tunnelförmigen Sammelkasten-Teil 5 befinden sich in Längsrichtung des Sammelkastens 2 gesehen jeweils auf der gleichen Höhe. Gemäß dem vorliegenden Ausführungsbeispiel sind je Deckel 6 im ebenen Sammelkasten-Teil 4 nur ein Anschlag 10 und versetzt hierzu zwei Laschen 11 vorgesehen, jedoch ist gemäß einer nicht in der Zeichnung dargestellten Variante auch eine dem tunnelförmigen Sammelkasten-Teil 5 entsprechende Ausgestaltung möglich. Die Laschen 11 sind von den Anschlägen 10 in Längsrichtung des Sammelkastens 2 gesehen um die Dicke des den Deckel 6 bildenden Blechs voneinander beabstandet, so dass eine exakte Positionierung in Folge einer formschlüssigen Verbindung vor dem Verlöten möglich ist.The existing of a sheet metal cover 6 are mounted from the front side of the collection box 2, where they are formed up to stop pins formed by stops 10, which are formed on the board by means of embossing, and punched out by means of the production of the board and after positioning Cover 6 bent tabs 11 are locked. For easier insertion of the cover 6 insertion bevels are provided on the board (see about over half of the board thickness going bevel in Fig. 9 ). Both the tabs 11 and the stops 10 in the tunnel-shaped collection box part 5 are located in the longitudinal direction of the collecting tank 2, each at the same height. According to the present embodiment, each cover 6 in the flat collection box part 4 only one stop 10 and offset this two tabs 11 is provided, but according to a variant not shown in the drawing also a the tunnel-shaped collection box part 5 corresponding design possible. The tabs 11 are viewed from the stops 10 in the longitudinal direction of the header 2 to the thickness of the lid 6 forming sheet spaced from each other, so that an exact positioning as a result of a positive connection before soldering is possible.

Gemäß dem vorliegenden Ausführungsbeispiel werden die Laschen 11 um eine Achse gebogen, die parallel zur Sammelkasten-Längsachse verläuft. Gemäß einer nicht in der Zeichnung dargestellten Variante ist auch ein Umbiegen der Laschen zum Deckel hin möglich, so dass lediglich je Lasche zwei in Längsrichtung des Sammelkastens verlaufende Schlitze in der Platine vorgesehen sein müssen. Ferner kann gemäß einer weiteren nicht in der Zeichnung dargestellten Variante die Begrenzung des Einschiebens der Deckel auf durch den jeweils ersten Durchzug für die Flachrohre begrenzt sein, so dass nur noch im tunnelförmigen Sammelkasten-Teil Anschläge vorgesehen sein müssen und die Gesamtlänge des Sammelkastens optimal ausgenutzt werden kann.According to the present embodiment, the tabs 11 are bent about an axis which is parallel to the collection box longitudinal axis. According to a variant not shown in the drawing, bending of the tabs towards the cover is also possible, so that only two tabs each extending in the longitudinal direction of the collecting box need to be provided in the blank. Further, according to another variant not shown in the drawing, the limitation of the insertion of the lid may be limited by the respective first passage for the flat tubes, so that only in the tunnel-shaped collection box part stops must be provided and the total length of the collecting tank are optimally utilized can.

Die Kältemittel-Zuführung und -Ableitung erfolgt, wie Fig. 10 entnommen werden kann, über ein an je einem mit einer Öffnung 12 versehenen Deckel 6 angebrachtes Einspritzrohr 13 bzw. ein Saugrohr 14. Die Öffnungen 12 der
Deckel 6 sind im entsprechenden, ausgestanzten Blechteil als Durchzüge ausgebildet, wobei die Deckel 6 in den Sammelkasten 2 derart eingebaut sind, dass die Ränder des Durchzugs jeweils nach außen ragen. Die Ausgangs-Blechstärke des Deckels 6, d.h. die Dicke des unbearbeiteten Blechs, beträgt ca. 1,5 mm, um eine sichere Lötverbindung an den Schmalseiten und eine ausreichende Materialstärke für die Durchzüge zu gewährleisten, so dass auch eine ausreichend. große Verbindungsfläche und somit eine sichere Verbindung zwischen den Rohren für die Kältemittel-Zuführung und - Ableitung und den Durchzügen gewährleistet werden kann. Hierbei sind auch die Deckel 6 ohne Durchzug zumindest in ihren äußeren, an der Platine des Sammelkastens 2 anliegenden Randbereichen eben ausgebildet.The refrigerant supply and discharge takes place as Fig. 10 can be removed, via an attached to each one provided with an opening 12 cover 6 injection pipe 13 and a suction pipe 14. Die Öffnung 12 der
Lid 6 are formed in the corresponding punched sheet metal part as passages, wherein the cover 6 are installed in the collecting box 2 such that the edges of the passage each protrude outward. The output sheet thickness of the cover 6, ie, the thickness of the unprocessed sheet, is about 1.5 mm, to ensure a secure solder joint on the narrow sides and a sufficient material thickness for the passages, so that a sufficient. large connection surface and thus a secure connection between the pipes for the refrigerant supply and - discharge and the passages can be ensured. Here are Also, the cover 6 without draft at least in their outer, adjacent to the board of the header box 2 border areas flat.

Der Durchzug für das Einspritzrohr 13 ist derart ausgebildet, dass das Einspritzrohr 13 in die Öffnung 12 bis auf die Höhe der Anschläge 10 eingeschoben ist. Hierfür weist der Durchzug des Deckels 6 einen leicht konischen, sich über die Länge des Durchzugs nach außen verjüngenden Innendurchmesser auf. Der Durchzug für das Saugrohr 14 weist einen sich nach außen verjüngenden Außendurchmesser auf, wobei das an seinem Ende etwas aufgeweitete Saugrohr 14 von außen aufgeschoben ist. Die Schräge beträgt bei beiden Öffnungen 12 bevorzugt 2-3°, maximal jedoch 5°.The passage for the injection tube 13 is formed such that the injection tube 13 is inserted into the opening 12 up to the height of the stops 10. For this purpose, the passage of the lid 6 has a slightly conical, over the length of the passage to the outside tapered inner diameter. The passage for the suction tube 14 has an outwardly tapering outer diameter, wherein the slightly expanded at its end suction pipe 14 is pushed from the outside. The slope is at both openings 12 preferably 2-3 °, but not more than 5 °.

Vorzugsweise werden fünf-kammrige Flachrohre insbesondere mit einer Breite von ca. 2,5 mm verwendet, wobei der Stegabstand unverändert bleibt, so dass der luftseitige Druckabfall sich nicht oder nur unwesentlich erhöht, verglichen mit bekannten Verdampfern mit normaler Bautiefe. Die Durchströmung des Verdampfers kann beispielsweise 6- oder, insbesondere bei kleinen Blockbreiten, 4-flutig erfolgen.Preferably, five-chambered flat tubes are used, in particular with a width of about 2.5 mm, wherein the web spacing remains unchanged, so that the air-side pressure drop does not increase or only marginally, compared with known evaporators with normal depth. The flow through the evaporator can take place, for example, 6-fold or, in particular in the case of small block widths, 4-pass.

In Fig. 13 ist die Rippengeometrie (Öffnungswinkel α zwischen benachbarten Rippenabschnitten 101, die über einen Rippenbogen 102 miteinander verbunden sind) bei 8 mm (Fig. 13a) und 4,5 mm Rippenhöhe (Fig. 13b), und zwar jeweils bei 60 Rippen pro 100 mm, im Vergleich dargestellt. In Fig. 13b ist ein Rippenbogen 102 mit einem kleineren Krümmungsradius (im Vergleich zu Fig. 13a) gezeigt. In diesem Zusammenhang sei darauf hingewiesen, dass ein Krümmungsradius in jedem Punkt des Rippenbogens 102 unterschiedlich sein kann und dass somit außer einem kreisbogenförmigen Querschnitt auch andere symmetrische oder asymetrische Formen des Rippenbogens 102 möglich sind.In Fig. 13 is the rib geometry (opening angle α between adjacent rib portions 101 which are connected to each other via a rib bow 102) at 8 mm ( Fig. 13a ) and 4 , 5 mm rib height ( Fig. 13b ), in each case at 60 ribs per 100 mm, shown in comparison. In Fig. 13b is a rib bow 102 having a smaller radius of curvature (as compared to FIG Fig. 13a ). In this connection, it should be noted that a radius of curvature in each point of the rib bow 102 may be different and thus other symmetrical or asymmetrical shapes of the rib bow 102 are possible in addition to a circular arc-shaped cross section.

Beispielsweise bei einer Bautiefe von T = 40 mm kommen zum einen Rippen mit einer Rippenhöhe h = 4,5 mm zum Einsatz, wodurch mehr Rippen und Flachrohre bzw. ein höherer Rippenwirkungsgrad und mehr Wärmeübertragungsfläche - bei gleicher Verdampfergröße - ermöglicht werden. Auf diese Weise wird eine höhere Leistungsdichte erzielt.For example, with a depth of T = 40 mm are used for a ribs with a rib height h = 4.5 mm, which more ribs and flat tubes or a higher fin efficiency and more heat transfer surface - are made possible - with the same evaporator size. In this way, a higher power density is achieved.

Fig. 14 zeigt die gespeicherten Wassermengen als Funktion der Wärmeaustauschfläche von erprobten Wärmetauschern, wobei die Rippenhöhe 1 größer als die Rippenhöhe 2 ist und die Rippenhöhe 2 größer als die Rippenhöhe 3 ist. Hier wird ebenfalls ein positiver Einfluß der kleineren Rippenhöhe auf das Speichervermögen bemerkbar. Die Werte wurden mittels eines einfachen Screening-Tests ermittelt, bei dem zunächst die Verdampfer in ein Wasserbad getaucht werden und nach Herausnehmen nach einer bestimmten Abtropfzeit die noch im Verdampfer befindliche Restwassermenge mittels Wiegen bestimmt wird. Fig. 14 shows the stored amounts of water as a function of the heat exchange surface of proven heat exchangers, wherein the fin height 1 is greater than the fin height 2 and the fin height 2 is greater than the fin height 3. Here is also a positive influence of the smaller rib height on the storage capacity noticeable. The values were determined by means of a simple screening test, in which first the evaporators are immersed in a water bath and, after removal after a certain dripping time, the remaining amount of water remaining in the evaporator is determined by weighing.

In Fig. 15 sind die auf die Wärmeaustauschfläche bezogenen gespeicherten Wassermengen in Abhängigkeit der Rippenhöhe dargestellt, wobei die Rippenhöhe nach rechts abnimmt. Die Werte wurden im Betrieb bei einem vorgegebenen Betriebspunkt ermittelt.In Fig. 15 are the stored on the heat exchange surface stored amounts of water as a function of the rib height shown, the rib height decreases to the right. The values were determined during operation at a given operating point.

In Fig. 16 sind die kritischen Luftmengen über der Rippenhöhe aufgetragen, ab denen ein Spritzen des jeweiligen Verdampfers beginnt (ebenfalls im Betrieb ermittelte Werte). Die Rippenhöhe nimmt hier nach rechts zu.In Fig. 16 the critical air volumes are plotted above the rib height, starting from which a spraying of the respective evaporator starts (values likewise determined during operation). The rib height here increases to the right.

Bei Verdampfern gemäß dem Stand der Technik liegt der Öffnungswinkel α bei etwa 14° (bei 60 Rippen pro 100 mm), oder niedriger. Bei der neuen Rippengeometrie (H = 4.5 mm, T = 40 mm) sind Winkel von ca. 28° zu erzielen (wiederum bei 60 Rippen pro 100 mm) (vergleiche Fig. 13). Bei noch keinerer Ausführung der Krümmungsradien der Rippenbögen 102 lässt sich der Öffnungswinkel weiter steigern.In evaporators according to the prior art, the opening angle α is about 14 ° (at 60 fins per 100 mm), or lower. With the new rib geometry (H = 4.5 mm, T = 40 mm), angles of approx. 28 ° can be achieved (again with 60 ribs per 100 mm) (cf. Fig. 13 ). If the radii of curvature of the ribbed curves 102 are not yet executed, the opening angle can be further increased.

Aufgrund des verbesserten Verhaltens gegen Spritzen sind ferner höhere Rippendichten zulässig, die sich wiederum positiv auf die Leistung auswirken, wenngleich sich dadurch der Öffnungswinkel wieder etwas reduziert. Bei einem bevorzugten Ausführungsbeispiel kommt eine 4,5 mm hohe Rippe mit einer Rippendichte von >= 70 Rippen pro 100 mm zum Einsatz, wobei der Öffnungswinkel dann etwa 22° beträgt.Due to the improved spray performance, higher rib densities are also allowed, which in turn have a positive effect on performance, although this somewhat reduces the opening angle. In a preferred embodiment, a 4.5 mm high rib with a rib density of> = 70 ribs per 100 mm is used, wherein the opening angle is then about 22 °.

Der sich ergebende Winkel bei einer 6 mm hohen Rippe liegt zwischen 15° und 22° (Verdampfer mit 6 mm hoher Rippe zeigen auch bereits ein deutlich besseres Ablauf- und Speicherverhalten als Verdampfer mti 8 mm hoher Rippe, hier ist allerdings auch die Anzahl an Ablaufflächen bzw. Flachrohren bereits höher). Die Wasserabscheidung wird darüberhinaus noch begünstigt durch eine größere zur Verfügung stehende Ablauffläche entlang der Flachrohre bzw. durch die größere Anzahl an Ablaufflächen/ Flachrohren bei vergleichbarem Kondensatanfall.The resulting angle at a 6 mm high rib is between 15 ° and 22 ° (evaporator with 6 mm high rib also already show a much better drainage and storage behavior as evaporator mti 8 mm high rib, here is also the number of drainage surfaces or flat tubes already higher). The water separation is also favored by a larger available drainage surface along the flat tubes or by the larger number of drainage surfaces / flat tubes with a comparable amount of condensate.

Claims (15)

  1. A heat exchanger, in particular a flat pipe evaporator (1) for a motor vehicle air conditioning system, comprising at least one collecting tank (2) made of sheet metal, which is divided in the longitudinal direction into at least two chambers, and the ends of pipes, in particular flat pipes, are introduced in the base thereof, which collecting tank (2) has a tunnel-shaped collecting tank part (5), an essentially flat collecting tank part (4), which forms the base, and covers (6) which are arranged in each case on the front side, characterised in that at least one cover (6) is embodied in a flat manner, at least in the area of its outer edge, and is positioned in the collecting tank with a positive fit, the cover (6) is introduced from the front side and on the collecting tank side lies against a number of stops (10) that are formed on the tunnel-shaped part (5) of the collecting tank and/or on the flat part (4) of the collecting tank, wherein the stops (10) are formed as stop pins using an embossing technique and in that the cover (6) is secured by bent brackets (11).
  2. The heat exchanger as claimed in claim 1, characterised in that the brackets (11) are part of the tunnel-shaped part (5) of the collecting tank and/or the flat part (4) of the collecting tank.
  3. The heat exchanger as claimed in claim 1 or 2, characterised in that the cover (6) has an opening (12) for the supply or return of the cooling medium, the edge of which is bent outwards in particular.
  4. The heat exchanger as claimed in claim 3, characterised in that the opening (12) is executed as a passage.
  5. The heat exchanger as claimed in claim 3 or 4, characterised in that the opening (12) is of conical execution with an angle having a maximum value of 5°, and in particular from 2° to 3°.
  6. The heat exchanger as claimed in one of claims 3 to 5, characterised in that a suction pipe (14), which is attached to the cover (6) with an opening (12), has an internal diameter that corresponds more or less to the external diameter of the edge circumscribing the opening (12).
  7. The heat exchanger as claimed in one of claims 3 to 6, characterised in that an injection pipe (13), which is attached to the cover (6) with an opening (12), has an external diameter that corresponds more or less to the smallest internal diameter of the edge circumscribing the opening.
  8. The heat exchanger as claimed in one of the preceding claims, characterised in that the edge of the collecting tank metal sheet for the covers (6) has an insertion taper.
  9. The heat exchanger as claimed in one of the preceding claims, characterised in that the two tunnel-shaped parts (5) of the collecting tank have an essentially semi-circular form.
  10. The heat exchanger as claimed in one of the preceding claims, characterised in that separating walls (8) in the heat exchanger are arranged in such a way that the flow through the heat exchanger is four-fold or greater.
  11. The heat exchanger as claimed in one of the preceding claims, with flat pipes and corrugated ribs, with at least one collecting tank, into the base of which the ends of the flat pipes are introduced, wherein the corrugated ribs have a rib height which corresponds in each case to the distance between two flat pipes, and wherein two rib sections connected in each case via a rib arc are inclined towards each other at an opening angle •, characterised in that the corrugated rib (3) has a height of 3 to 6 mm, preferably 4 to 5 mm, and a rib density of 50 to 90 ribs, preferably 60 to 80 ribs, in particular preferably 70 ribs per 100 mm.
  12. The heat exchanger as claimed in one of the preceding claims, characterised in that the opening angle of at least two rib sections, preferably a large number or all of the rib sections, amounts to 22° +/- 7° or 30° +/- 10°.
  13. The heat exchanger as claimed in one of the preceding claims, characterised in that one or more rib arcs have, at least in some areas, a radius of curvature smaller than 0.4 mm, preferably smaller than or equal to 0.35 mm, in particular preferably smaller than or equal to 0.3 mm.
  14. The heat exchanger as claimed in one of the preceding claims, characterised in that the flat pipes have a width of about 1.5 to 3 mm.
  15. A motor vehicle air conditioning system, characterised by an evaporator as claimed in one of the preceding claims.
EP05707067.4A 2004-01-28 2005-01-28 Heat exchanger, in particular a flat pipe evaporator for a motor vehicle air conditioning system Not-in-force EP1711772B1 (en)

Applications Claiming Priority (2)

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DE102004004494 2004-01-28
PCT/EP2005/000859 WO2005073662A1 (en) 2004-01-28 2005-01-28 Heat exchanger, in particular a flat pipe evaporator for a motor vehicle air conditioning system

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EP1711772B1 true EP1711772B1 (en) 2016-12-28

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EP (1) EP1711772B1 (en)
CN (1) CN100565079C (en)
BR (1) BRPI0507143B1 (en)
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Also Published As

Publication number Publication date
CN1914473A (en) 2007-02-14
CN100565079C (en) 2009-12-02
BRPI0507143A (en) 2007-06-19
DE102005004284A1 (en) 2005-08-11
US20080029256A1 (en) 2008-02-07
EP1711772A1 (en) 2006-10-18
BRPI0507143B1 (en) 2018-08-07
WO2005073662A1 (en) 2005-08-11

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