EP3396296B1 - Wärmetauscheranordnung - Google Patents

Wärmetauscheranordnung Download PDF

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Publication number
EP3396296B1
EP3396296B1 EP17461529.4A EP17461529A EP3396296B1 EP 3396296 B1 EP3396296 B1 EP 3396296B1 EP 17461529 A EP17461529 A EP 17461529A EP 3396296 B1 EP3396296 B1 EP 3396296B1
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EP
European Patent Office
Prior art keywords
teeth
undercut
heat exchanger
exchanger assembly
undercuts
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
EP17461529.4A
Other languages
English (en)
French (fr)
Other versions
EP3396296A1 (de
Inventor
Radoslaw Jonczyk
Dariusz Potok
Maciej KLUSEK
Rafa PAC
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.)
Valeo Autosystemy Sp zoo
Original Assignee
Valeo Autosystemy Sp zoo
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Publication date
Application filed by Valeo Autosystemy Sp zoo filed Critical Valeo Autosystemy Sp zoo
Priority to EP17461529.4A priority Critical patent/EP3396296B1/de
Publication of EP3396296A1 publication Critical patent/EP3396296A1/de
Application granted granted Critical
Publication of EP3396296B1 publication Critical patent/EP3396296B1/de
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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
    • F28F9/0219—Arrangements for sealing end plates into casing or header box; Header box sub-elements
    • F28F9/0224—Header boxes formed by sealing end plates into covers
    • F28F9/0226—Header boxes formed by sealing end plates into covers with resilient gaskets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D11/00—Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 - B21D9/00; Twisting
    • B21D11/08—Bending by altering the thickness of part of the cross-section of the work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/02—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers
    • B21D53/04—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of sheet metal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2275/00—Fastening; Joining
    • F28F2275/12—Fastening; Joining by methods involving deformation of the elements
    • F28F2275/122—Fastening; Joining by methods involving deformation of the elements by crimping, caulking or clinching
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2275/00—Fastening; Joining
    • F28F2275/16—Fastening; Joining with toothed elements, e.g. with serrations

Definitions

  • the present invention relates to a heat exchanger assembly, according to claim 1, especially a water charge air cooler for a motor vehicle.
  • the prior art heat exchanger assembly comprises: a housing; a core situated in the housing and comprising a plurality of spaced-apart flow tubes; two headers placed on the core; and inlet and outlet conduits covering the headers and closing the housing.
  • the headers comprise at their perimeters a plurality of teeth.
  • the inlet and outlet conduits are received in the headers so that the teeth are bent over protruding portions of the inlet and outlet conduits.
  • each tooth is provided on its inner surface with an undercut.
  • the undercut can be circular or elliptic in cross-section.
  • the radius of the prior art undercuts was 0,5 mm
  • a general thickness of the tooth was 2 mm
  • a limited thickness of the tooth at the undercut was 1,5 mm.
  • FR 2 968 753 A1 describes a heat exchanger assembly according to the preamble of claim 1.
  • the aim of the present invention is to eliminate the drawbacks of the prior art mentioned above. Especially, the aim of the present invention is to provide a heat exchanger assembly having a new undercut configuration, by which stresses in the undercut itself are significantly reduced.
  • the heat exchanger assembly comprises: a housing; a core situated inside the housing; two headers placed on the core; and inlet and outlet conduits covering the headers and closing the housing.
  • the headers comprise at their perimeters a plurality of teeth, which are bent over the inlet and outlet conduits.
  • Each of the teeth is provided on its inner surface with an undercut, which has an undercut axis.
  • the undercut axis divides each of the teeth into a base portion and a bendable portion.
  • the bendable portion has a height measured from the undercut axis to an end of each of the teeth.
  • Each of the teeth has a general thickness as well as a reduced thickness at the undercut.
  • the undercut Prior to bending of the teeth over the inlet and outlet conduits: the undercut has a substantially elliptic cross-section; a semi-minor axis of an ellipse of the undercut cross-section coincides with the undercut axis; the semi-minor axis has a length, which is at least half of the general thickness; and the reduced thickness of each of the teeth is at most two times smaller than the height of the bendable portion.
  • the configuration of the undercuts described above allows for the stresses at the undercuts, once the teeth have been bent over the inlet and outlet conduits, to be significantly reduced due to the fact that there are no sharp edges inside the undercuts following the bending.
  • the undercuts, after bending still include only smooth surfaces, which are free from any sharp edges, violent bends, etc., where stresses could cumulate.
  • the undercuts used in the heat exchanger assembly of the present invention help to define a precise bending line for each tooth. Also, the repeatability of the bending process in mass production is increased.
  • a heat exchanger assembly according to the present invention is indicated as a whole by numeral reference 1.
  • the heat exchanger assembly 1 comprises a housing 2, which in the embodiment shown in the figures is made of two separate half-shells, i.e. a first half-shell 21 and a second half-shell 22.
  • the housing 2 can consist of any appropriate number of shells and/or plates, e.g. three, four, etc.
  • the housing 2 includes inlet and outlet ports 23, 24 for a coolant, in particular a cooling liquid, as well as a degassing port 25, which serves to remove the air that may be trapped in the coolant.
  • a core 3 is placed tightly inside the housing 2.
  • the core 3 includes a plurality of spaced-apart flat hollow flow tubes 31, i.e. there is some free space between two adjacent flow tubes 31 and the coolant flows through these free spaces.
  • the core 3 further includes a plurality of coolant turbulators 32 arranged between the flow tubes 31. Namely, one coolant turbulator 32 is situated between two adjacent flow tubes 31.
  • the coolant turbulators 32 function to turn a laminar flow of the coolant into a turbulent one and, in turn, to increase the heat exchange efficiency.
  • the coolant turbulators 32 can be omitted.
  • the flow tubes 31 are hollow and a medium to be cooled down, for example a fluid, such as a gas, flows therethrough.
  • the flow tubes 31 have two wide sides, two narrow sides and two open ends.
  • the flow tubes 31 are arranged with their wide sides parallel to each other.
  • the flow tubes 31 can be provided internally with a series of fluid fins.
  • the heat exchanger assembly 1 further comprises two headers 4.
  • Each header 4 is located on and connected to one end of the core 3, i.e. that presenting the open ends of the flow tubes 31.
  • each of the headers 4 is, preferably at its entire outer perimeter, see in particular fig. 2 , in contact with an inner wall of the housing 2.
  • the header 4 comprises a plurality of through slots 42 so that the open ends of the flow tubes 31 fit into the slots 42.
  • the number of the through slots 42 is equal to the number of the flow tubes 31 and the shape of the slots 42 corresponds to the shape of the cross-section of the open ends of the flow tubes 31.
  • the heat exchanger assembly 1 comprises inlet and outlet conduits 51, 52 for the medium to be cooled down.
  • the inlet conduit 51 receives a hot medium from a motor vehicle and transfers it to the core 3 where it can be cooled down, whereas the outlet conduit 52 delivers a medium of a lower temperature back to the motor vehicle.
  • the inlet and outlet conduits 51, 52 cover the headers 4 and close the housing 2. In other words, the inlet and outlet conduits 51, 52 close two openings in the housing 2, which are intended for the flow of the medium to be cooled down, and make the housing 2 complete.
  • a seal 6 may be placed between each of the headers 4 and each of the inlet and outlet conduits 51, 52.
  • All components of the heat exchanger assembly 1, except for the seal 6, can be made of materials suitable for brazing, for example aluminum, steel and their alloys. In order to obtain the proper fluid-tightness of the assembly all components thereof are connected to each other by brazing.
  • the headers 4 comprise at their perimeters a plurality of teeth 41. As seen in figure 2 , when the heat exchanger assembly 1 is assembled, the inlet and outlet conduits 51, 52 cover the headers 4. Moreover, the teeth 41 of the headers 4 are bent over protruding portions of the inlet and outlet conduits 51, 52. In fact, it can be said that the inlet and outlet conduits 51, 52 are received in a space defined between the teeth 41 of the headers 4.
  • the teeth 41 and the headers 4 include an inner surface 44 and an outer surface 45. Additionally, the teeth 41 are provided on their inner surfaces 44 with undercuts 43.
  • the function of the undercuts 43 is to facilitate bending of the teeth 41 over the inlet and outlet conduits 51, 52, namely the inlet and outlet conduits 51, 52 are introduced between the teeth 41 of the headers 4 and the teeth 41 are subsequently bent over the inlet and outlet conduits 51, 52, more precisely over their protruding end portions, as seen in figure 2 .
  • each of the undercuts 43 has an undercut axis A.
  • the undercut axis A extend through the deepest point of the undercut 43 and, if the teeth 41 are straight, is perpendicular to the inner surface 44 of the tooth 41.
  • the undercut axis A divides the undercut 43 into two identical halves.
  • the undercuts 43 more precisely their undercut axes A, divide each tooth 41 into a base portion 41a and a bendable portion 41b.
  • the bendable portion 41b has a height H measured from the undercut axis A to an end of the tooth 41.
  • the headers 4 and the teeth 41 have a general thickness GT.
  • the general thickness GT of the header 4 and/or teeth 41 should be understood as a thickness of a material used for headers 4 and teeth 41 because both the headers 4 and the teeth 41 are preferably made of a single sheet of material having a uniform thickness.
  • the headers 4 and the teeth 41 can be made of a material with a varying thickness.
  • the teeth 41 have at their undercuts 43 a reduced thickness RT. Namely, the reduced thickness RT corresponds to the amount of header/tooth material left once the undercuts 43 have been made and prior to bending.
  • the reduced thickness RT can also be defined as a distance between the deepest point of the undercut 43 and the nearest point on the outer surface 45 of the tooth 41.
  • the general thickness GT of the header 4 and, especially, the teeth 41 is 2mm.
  • each undercut 41 prior to bending, each undercut 41 has a circular cross-section and has a radius R of 1mm, while the reduced thickness RT is 1,5 mm and the height H is 3mm.
  • the undercut 43 has a surface, which is in fact a sector of a cylindrical surface.
  • the position of the undercut 43 on the inner surface 44 of the tooth 41 is such that the undercut axis A, when the inlet and outlet conduits 51, 52 are received between the teeth 41 prior to bending, is located above a surface over which the teeth 41 are to be bent, in this case a surface 51a of the inlet and outlet conduits 51, 52.
  • undercuts 43 should be originally free from any sharp edges, i.e. they should include only smooth surfaces.
  • the present invention is not limited to the dimensions mentioned above, which represent only one embodiment of the heat exchanger assembly 1.
  • the reduced thickness RT should be at most two times smaller than the height H of the bendable portion 41b of the tooth 41, while the radius R of the undercut 43 should be at least half of the general thickness GT of the material used for the headers 4 and, especially, the teeth 41.
  • the undercuts 43 may have other shapes of cross-section than those shown in figures 1-5 and described above.
  • the undercuts 43 may have an elliptic cross-section before bending the teeth 41 over the inlet and outlet conduits 51, 52.
  • a semi-minor axis A1 of an ellipse of the undercut cross section coincides with the undercut axis A
  • a semi-major axis A2 of the ellipse of the undercut 43 is perpendicular to the undercut axis A.
  • the semi-minor axis A1 of the ellipse has a length, which is at least half of the general thickness GT of the material used for the headers 4 and, especially, the teeth 41.
  • the semi-minor axis A1 is 1 mm long and the general thickness GT is 2mm.
  • the length of the semi-major axis A2 is in general greater than the length of the semi-minor axis A1.
  • the semi-major axis A2 and the semi-minor axis A1 of the undercut 43 can be of equal lengths.
  • undercuts 43 have once again the circular cross-section, as discussed above.
  • a circle is the special case of an ellipse, and the semi-minor axis A1 and the semi-major axis A2 of the ellipse simply become the radius R of the circle, which is constant throughout the undercut 43.
  • the undercuts 43 extend through the entire width of the teeth 41, i.e. they open to edges of the teeth 41.
  • the undercuts 43 can be interrupted in a distance from the edges of the teeth 41 ( Figure 7 ), i.e. the undercuts 43 end before reaching the edges.
  • the bendable portions 41b of the teeth 41 are slightly pre-bent at the undercuts 43 towards the outside of the headers 4.
  • an angle of the pre-bend is 20° with respect to the extension of the base portion 41a.

Landscapes

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

Claims (7)

  1. Wärmetauscheranordnung (1), die Folgendes umfasst:
    ein Gehäuse (2);
    einen Kern (3), befindlich im Inneren des Gehäuses (2); zwei Verteiler/Sammler (4), platziert auf dem Kern (3); und
    Einlass- und Auslassleitungen (51, 52), die die Verteiler/Sammler (4) bedecken und das Gehäuse (2) schließen;
    wobei die Verteiler/Sammler (4) an ihren Umfängen mehrere Zähne (41) umfassen, die über die Einlass- und Auslassleitungen (51, 52) gebogen sind;
    dadurch gekennzeichnet, dass
    jeder der Zähne (41) an seiner inneren Oberfläche (44) mit einem Unterschnitt (43) versehen ist, der eine Unterschnittachse (A) aufweist; wobei die Unterschnittachse (A) jeden der Zähne (41) in einen Basisteil (41a) und einen biegbaren Teil (41b) unterteilt, wobei der biegbare Teil (41b) eine Höhe (H) aufweist, die von der Unterschnittachse (A) zu einem Ende von jedem der Zähne (41) gemessen wird;
    wobei jeder der Zähne (41) eine allgemeine Dicke (GT) sowie eine verringerte Dicke (RT) an dem Unterschnitt (43) aufweist; und
    wobei vor dem Biegen der Zähne (41) über die Einlass- und Auslassleitungen (51, 52) der Unterschnitt (43) einen im Wesentlichen elliptischen Querschnitt hat und eine kleine Halbachse (A1) einer Ellipse des Unterschnitts mit der Unterschnittachse (A) zusammenfällt;
    wobei die kleine Halbachse (A1) eine Länge aufweist, die mindestens die Hälfte der allgemeinen Dicke (GT) ist; und wobei die verringerte Dicke (RT) jedes der Zähne (41) mindestens zweimal kleiner als die Höhe (H) des biegbaren Teils (41b) ist.
  2. Wärmetauscheranordnung (1) nach Anspruch 1, dadurch gekennzeichnet, dass die Länge der kleinen Halbachse (A1) gleich einer Länge einer großen Halbachse (A2) ist, wobei die Unterschnitte (43) tatsächlich einen kreisförmigen Querschnitt haben, sodass die Unterschnitte (43) nur einen konstanten Radius (R) haben.
  3. Wärmetauscheranordnung (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die kleine Halbachse (A1) und/oder der Radius (R) 1 mm lang ist/sind, die allgemeine Dicke (GT) 2 mm ist, die verringerte Dicke (RT) 1,5 mm ist und die Höhe (H) 3 mm ist.
  4. Wärmetauscheranordnung (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Unterschnitte (43) an den Zähnen (41) positioniert sind, sodass die Unterschnittachsen (A), vor dem Biegen der Zähne (41) über die Einlass- und Auslassleitungen (51, 52), über einer Oberfläche (51a) befindlich sind, über die die Zähne (41) gebogen werden sollen.
  5. Wärmetauscheranordnung (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Unterschnitte (43) in einem Abstand von den Kanten der Zähne (41) enden.
  6. Wärmetauscheranordnung (1) nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass sich die Unterschnitte (43) über eine gesamte Breite jedes der Zähne (41) erstrecken.
  7. Wärmetauscheranordnung (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Wärmetauscheranordnung (1) ein Wasser-Ladeluftkühler ist.
EP17461529.4A 2017-04-28 2017-04-28 Wärmetauscheranordnung Active EP3396296B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP17461529.4A EP3396296B1 (de) 2017-04-28 2017-04-28 Wärmetauscheranordnung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17461529.4A EP3396296B1 (de) 2017-04-28 2017-04-28 Wärmetauscheranordnung

Publications (2)

Publication Number Publication Date
EP3396296A1 EP3396296A1 (de) 2018-10-31
EP3396296B1 true EP3396296B1 (de) 2020-09-09

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Application Number Title Priority Date Filing Date
EP17461529.4A Active EP3396296B1 (de) 2017-04-28 2017-04-28 Wärmetauscheranordnung

Country Status (1)

Country Link
EP (1) EP3396296B1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3722724B1 (de) * 2019-04-12 2022-10-19 João de Deus & Filhos, S.A. Flüssigkeitsdichte verbindung für wärmetauscher und wärmetauscher, der eine solche verbindung enthält.
EP3789721B1 (de) * 2019-09-09 2022-01-05 Valeo Autosystemy SP. Z.O.O. Ausgleichsbehälteranordnung

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE8102351L (sv) * 1981-04-13 1982-10-14 Plannja Ab Forfarande for att astadkomma bockning
FR2968224B1 (fr) * 2010-12-07 2013-08-23 Valeo Systemes Thermiques Ensemble de deux pieces serties l'une sur l'autre
FR2968753B1 (fr) * 2010-12-10 2012-12-21 Valeo Systemes Thermiques Echangeur de chaleur, notamment pour vehicule automobile

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

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