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
  • F28F1/00—Tubular elements; Assemblies of tubular elements
  • F28F1/02—Tubular elements of cross-section which is non-circular
• • 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
  • F28F1/24—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 and extending transversely
  • F28F1/32—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 and extending transversely the means having portions engaging further tubular elements
  • F28F1/325—Fins with openings
• • 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
  • F28F1/02—Tubular elements of cross-section which is non-circular
  • F28F1/025—Tubular elements of cross-section which is non-circular with variable shape, e.g. with modified tube ends, with different geometrical features
• • 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
  • F28F1/24—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 and extending transversely
  • F28F1/32—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 and extending transversely the means having portions engaging further tubular elements
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
  • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
  • F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
  • F28F21/081—Heat exchange elements made from metals or metal alloys
• • 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
• • 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

Definitions

• the present invention relates to the technical field of heat exchangers for a motor vehicle and relates more specifically to a tube for such an exchanger.
• the exchanger tubes concerned are so-called "flat" tubes intended to pass through the orifices of a plurality of fins of the heat exchanger. Shaping of the tubes in the exchanger is carried out by expansion in order to press them against the edges of the orifices of the fins.
• Such a tube comprises two longitudinal flanks facing each other which are curved and have a concave portion (that is to say a portion having a convexity turned towards the inside of the tube), so that the tube has a restricted outer width in a region where the longitudinal flanks are closest to each other.
• This type of tube, particularly flat, is therefore adapted to be arranged in a heat exchanger whose size is reduced.
• the present invention is intended in particular to overcome the aforementioned problems by providing a heat exchanger tube whose thermal efficiency is improved.
• the subject of the invention is a tube for a motor vehicle heat exchanger, having a cross section comprising two opposite longitudinal sides, each side being provided with at least two concave portions.
• the tube as defined above may further comprise one or more of the following features, taken alone or in combination.
• the two concave portions are separated by a convex portion.
• a convex portion is understood in the broad sense, that is to say, without it being necessary for the convex portion to have a particular form.
• the convex portion is dimensioned so that the internal perimeter of the section has a value greater than at least 2% with respect to the section of a tube whose flanks are rectilinear.
• the convex portion makes it possible to increase the internal perimeter, also called wet perimeter, of the tube by a value of 2% with respect to a tube having no convexity, which has the effect of increasing the performance of heat exchange of the tube.
• the sidewalls of the tube are connected to each other by parts of substantially circular or oval shape.
• a tube length L refers to the maximum distance between the portions of substantially circular shape outside the tube
• a width ⁇ Tube denotes the smallest distance between the two sides of tube outside of the tube
• a T m of the tube flatness ratio is defined by the equation
• the invention also relates to a fin having at least one substantially oblong orifice having an edge provided with two opposite longitudinal flanks, each provided with at least two convex portions.
• the specific form of such a fin is particularly suitable for preventing elastic return of the sidewalls of the tube after shaping in an orifice of the fin.
• the two convex portions of the fin are separated by a concave portion.
• Such a shape contributes to a good cohesion of the flanks of the tube with the orifice of the fin.
• the invention also relates to a heat exchanger provided with at least one fin having at least one tube as above.
• An exchanger equipped with fins and tubes as defined above thus has an improved heat exchange efficiency.
• the invention finally relates to an assembly comprising at least one tube as above and at least one fin in which the tube is configured to be introduced into a hole of the fin with an existing set between the tube and the orifice.
• FIG. 1 is a sectional view of a tube according to the invention.
• FIG. 1 is an elevational view of a portion of a fin for receiving a tube of Figure 1.
• a tube 10 according to the invention before its forming by deformation. It has a cross section of substantially oblong shape with two longitudinal flanks 12 facing each other, each side being provided with at least two concave portions 14.
• the tube 10 comprises two substantially curved hollow shapes 14.
• each flank 12 of the tube has a portion in relief arranged between the two recessed shapes 14.
• the tube 10 is made from a metal alloy adapted to be easily deformed and has a wall of substantially constant thickness e.
• the tube has a length L tube designating the greatest distance separating the two end portions 16 of substantially circular shape outside the tube and a width ⁇ tube designating the smallest distance between the two flanks 12 of the tube. tube outside the tube.
• a flatness ratio T, of the tube can be defined by the relation;
• a fin 20 of generally rectangular shape comprises a plurality of holes 22 arranged in a row of axis N.
• the holes 22 of a fin 20 are separated in pairs by rows of louvers 24 well known of the person skilled in the art, and whose function is to increase the heat exchange of the fins 20.
• Each orifice 22 has a cross section of substantially oblong shape with two longitudinal edges 26 facing one another, each edge 26 being provided with at least two convex portions 28. The two convex portions 28 of an edge 26 of the orifice 22 are separated by a concave portion 30. Seen from the inside of the orifice, each longitudinal edge has a recess and two parts in relief.
• Each orifice 22 of a fin 20 thus has a shape substantially identical to that of a tube 10 but its dimensions are smaller in order to allow threading of the tube inside the orifice 22 before shaping.
• each orifice is configured to receive a tube as previously described so that an assembly formed by an orifice provided with a tube has a clearance J between the tube and the corresponding receiving orifice.
• a method of forming a tube 10 according to the invention in a plurality of fins 20 of a heat exchanger will now be described.
• the tube 10 is positioned in an orifice 22 of at least one fin 20, so that the tube 10 is placed forming a clearance J between the tube and the orifice, said set J n not having a regular value over the entire periphery of the tube.
• the tube is pressed by expansion of its walls inside the orifice 22 of the fin.

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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)

Applications Claiming Priority (2)

Publications (1)

Family

ID=51293096

Family Applications (1)

Country Status (8)

Families Citing this family (3)

Family Cites Families (16)

• 2014
  • 2014-05-05 FR FR1454043A patent/FR3020670B1/fr not_active Expired - Fee Related
• 2015
  • 2015-05-05 CN CN201580030152.9A patent/CN106461349A/zh active Pending
  • 2015-05-05 US US15/308,855 patent/US20170067694A1/en not_active Abandoned
  • 2015-05-05 WO PCT/EP2015/059867 patent/WO2015169808A1/fr not_active Ceased
  • 2015-05-05 EP EP15722500.4A patent/EP3140603A1/de not_active Withdrawn
  • 2015-05-05 KR KR1020167031808A patent/KR20160145138A/ko not_active Ceased
  • 2015-05-05 JP JP2016566718A patent/JP2017515087A/ja active Pending
  • 2015-05-05 MX MX2016014498A patent/MX2016014498A/es unknown

Non-Patent Citations (2)

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