EP2901096B1 - Rohr für einen kraftfahrzeugwärmetauscher - Google Patents

Rohr für einen kraftfahrzeugwärmetauscher Download PDF

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Publication number
EP2901096B1
EP2901096B1 EP13766330.8A EP13766330A EP2901096B1 EP 2901096 B1 EP2901096 B1 EP 2901096B1 EP 13766330 A EP13766330 A EP 13766330A EP 2901096 B1 EP2901096 B1 EP 2901096B1
Authority
EP
European Patent Office
Prior art keywords
tube
row
ducts
channels
duct
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
EP13766330.8A
Other languages
English (en)
French (fr)
Other versions
EP2901096A1 (de
Inventor
Christian Riondet
Jean-Marc Lesueur
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 Systemes Thermiques SAS
Original Assignee
Valeo Systemes Thermiques SAS
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Publication date
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Publication of EP2901096A1 publication Critical patent/EP2901096A1/de
Application granted granted Critical
Publication of EP2901096B1 publication Critical patent/EP2901096B1/de
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
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/02—Tubular elements of cross-section which is non-circular
    • F28F1/022—Tubular elements of cross-section which is non-circular with multiple channels

Definitions

  • the present invention relates to the technical field of heat exchangers for motor vehicles, and relates more specifically to a tube for such an exchanger according to the preamble of claim 1.
  • the document JP 59205591 discloses such a tube.
  • the heat exchanger tubes concerned are intended to be used for example in cooling radiators, especially low temperature cooling radiators, or condensers of air conditioning circuits of vehicles.
  • such a tube extends in a longitudinal direction and has a cross section, the tube having in its interior a plurality of longitudinal channels of fluid flow. Usually, these channels are aligned to form a row of channels according to the cross section of the tube.
  • the present invention is intended to provide a heat exchanger tube whose thermal efficiency is improved.
  • the subject of the invention is a tube for a motor vehicle heat exchanger according to claim 1.
  • an exchanger tube which has in its cross section, not a single row of channels, but at least two rows, preferably arranged one in parallel with the other. This is particularly advantageous insofar as this makes it possible to have more channels in the tube, thus to improve the thermal performance of the tube, without producing channels of too small diameter, which can increase the pressure drops.
  • it is proposed to increase the exchange surface by increasing the number of channels with this particular provision, rather than decreasing the diameter of these channels. This good compromise between the hydraulic diameter and the losses of charges improves the thermal efficiency of the exchanger.
  • the number of channels per tube is relatively limited since each tube accommodates a single row of channels.
  • row of channels is preferably understood to mean an imaginary straight line lying in a cross section of the tube and passing through axes of longitudinal symmetry of several channels. It is of course understood that the tube may possibly comprise more than two distinct rows. It will further be understood that preferably one channel forming a row of the tube is only part of this row and not the other. In other words, the channels of one row do not "bite" on the other row.
  • the tube proposed above is advantageously used in a heat exchanger such as a cooling radiator or an air conditioning circuit condenser. It will be noted that the heat exchanger may comprise between 20 and 150 tubes.
  • a tube comprises between 3 and 7 channels per row, preferably between 4 and 5 channels per row.
  • the pressure of the fluid flowing inside the channels is between 1 and 10 bar, preferably of the order of 2 to 3 bar.
  • the radiator is for example used to cool an engine, a so-called "low temperature" loop for cooling electronic components, a battery, an air / water heat exchanger, and / or a hybrid engine for hybrid vehicles.
  • a tube in the case of an air conditioning circuit condenser, a tube generally comprises between 8 and 20 channels per row, preferably between 10 and 16 channels per row.
  • the pressure of the fluid flowing inside the channels is often between 10 and 150 bar, preferably of the order of 80 to 120 bar.
  • this relatively large number of channels is interesting in that it allows for small channels, capable of providing better resistance to this high pressure, where larger channels might 'explode.
  • the tube is generally manufactured by extrusion or by folding and sometimes has internal fins intended to increase the thermal performance.
  • the invention also relates to a heat exchanger for a motor vehicle comprising a plurality of tubes as shown above, the tubes extending substantially parallel to each other, the distance of the axes of two consecutive tubes, called "no ", Being between 6 and 10 millimeters, preferably between 6 and 8 millimeters.
  • no the distance of the axes of two consecutive tubes
  • the efficiency of a heat exchanger comprising such tubes is improved. Note that the smaller the pitch, the better the heat exchange.
  • the longitudinal direction L is defined as the direction which extends parallel to the longitudinal axis of the tube 10, the longitudinal axis of the tube generally corresponding to the direction of flow of the fluid inside the tube.
  • the cross section of the tube is defined by the intersection of the tube with a plane perpendicular to the longitudinal direction L.
  • the cross section is defined by a first direction T and a second direction perpendicular to the direction T in the plane perpendicular to the longitudinal direction L.
  • the outer cross section of the tube is delimited by a length L tube and a tube thickness , which is between 1 and 2 millimeters.
  • the heat exchanger comprises a plurality of tubes 10 as shown in this example, generally between 20 and 150 tubes such as tube 10. These are arranged parallel to each other and so as to form spaces, called spaces inter-tubes, in which circulates a flow of air.
  • the distance between the longitudinal axes of two consecutive tubes 10 is 6 millimeters. This distance may in certain cases be different, and have a value of between 6 and 10 millimeters, preferably between 6 and 8 millimeters.
  • Each tube 10 is provided with an outer skin 11 which allows the heat exchange and comprises inside thereof a plurality of longitudinal channels 12 for circulating a refrigerant fluid whose function is to exchange heat with the flow of heat. air circulating between the tubes 10, so as to cool.
  • the tube substantially forms an elongated rectangle, of oblong shape, having two long straight parallel edges 13, and two rounded lateral edges 14.
  • the tube is for example made from an alloy sheet metal strip. aluminum. This strip is subjected to metallurgical processes which make it easier to shape the tubes by folding and their assembly by brazing in the exchanger. However, it is also possible to realize these tubes by other manufacturing processes, for example by extrusion.
  • a majority of the channels 12 are distributed so as to define two distinct rows of channels 12.
  • the rows 15 are separated by a continuous strip of material 16.
  • Each row 15 is substantially parallel to the length of the tube L tube and a row 15 of channels 12 has a length L row .
  • the two rows 15 are parallel to each other and the channels 12 of one of the rows are aligned in pairs with the channels of the second row.
  • Two consecutive channels 12 of the same row 15 are separated by a material bridge 18 which has a width corresponding to a channel / channel distance of between 0.2 and 0.4 millimeters.
  • the channels 12 of a row 15 have a generally rectangular shape.
  • Each channel of a row has a long side corresponding to a length L channel taken in the direction of the row and between 0.5 and 5 millimeters, and a small side corresponding to a width l channel taken in the perpendicular direction of the row included between 0.3 and 0.7 millimeters.
  • the tube 10 has two end channels 20, which are adjacent to the lateral edges 14. These end channels 20 have a rounded wall 21 whose profile corresponds to the profile of the lateral edges 14 of the tube, their section forming a D. note that the end channels 20 intersect each of the two rows. It is considered that these end channels 20, which bite each on the two rows 15, are not part of the channels defining the rows 15 defined above. In other words, the rows 15 are imaginary lines composed solely of the juxtaposition of channels similar to the channels 12, without including the biting channels on the two rows.
  • the sum of the channel lengths L of the channels 12 of a row, divided by the length of this row L row is greater than or equal to 0.75.
  • the sum of the channel lengths of the channels of a row, divided by the length of this row L row could be greater than 0.8 or even greater than 0.85.
  • the channels 12 of a row 15 comprise a wall 22 adjacent to the skin external 11, which corresponds to the distance closest to a channel 12 of the outer skin 11 of a tube.
  • a tube / channel distance between the outer skin 11 of the tube and the adjacent wall 22 of a channel is between 0.2 and 0.4 millimeters.
  • the channels 12 of one of the rows 15 are mainly staggered with respect to channels of the second row 15. to do this, at least one channel or two channels of a same row have a length L channel is greater than that of the other channels 12. This allows the channels 12 of one row are arranged staggered with compared to those of the other. In this case, they are channels arranged right next to the end channels 20 which have a longer length.
  • Such a staggered conformation means that the channels are not aligned in pairs with the channels of the second row, which makes it possible to optimize the mechanical strength and the thermal efficiency of the tube.
  • the exchanger tubes described above are most often made by folding, however, they can also be manufactured by extrusion. Alternatively, such tubes may have fins on their inner walls to create multiple channels.
  • the tubes as described in the example may comprise additional rows of channels so as to respond to particular thermal stresses.
  • the length L channel may vary from one channel to another in the same row, allowing different configurations in which the channels of one of the rows are not aligned with the channels on the other of the rows.
  • combinations of the various embodiments described above are possible.

Landscapes

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

Claims (8)

  1. Rohr (10) für einen Kraftfahrzeugwärmetauscher, das sich in einer Längsrichtung erstreckt und einen Querschnitt aufweist, wobei das Rohr(10) in seinem Inneren mehrere Längskanäle (12) zur Zirkulation eines Fluids aufweist, wobei wenigstens ein Teil der Kanäle im Querschnitt des Rohres (10) derart verteilt ist, dass zwei verschiedene Reihen (15) von Kanälen (10) definiert werden, wobei das Rohr dadurch gekennzeichnet ist, dass entlang des Querschnitts des Rohres jeder Kanal einer Reihe eine in der Richtung dieser Reihe gemessenen Länge L canal aufweist, wobei die Reihe von Kanälen eine Länge L rangée aufweist, wobei die Summe der Längen L canal der Kanäle der Reihe, dividiert durch die Länge der Reihe L rangée, größer oder gleich 0,75; vorzugsweise größer als 0,8; noch stärker bevorzugt größer als 0,85 ist, wobei das Rohr eine Dicke e tube zwischen 1 und 2 Millimetern aufweist, wobei die in einer Reihe angeordneten Kanäle eine Breite I canal, in der senkrechten Richtung der Reihe gemessen, zwischen 0,3 und 0,7 Millimetern aufweisen und die in einer Reihe angeordneten Kanäle eine Länge L canal , in der Richtung der Reihe gemessen, zwischen 0,5 und 5 Millimetern aufweisen.
  2. Rohr (10) nach Anspruch 1, welches einen durchgehenden Materialstreifen (16) zwischen den zwei Reihen (15) umfasst.
  3. Rohr (10) nach einem der vorhergehenden Ansprüche, wobei die Kanäle (10) einer der Reihen (15) überwiegend versetzt in Bezug auf Kanäle (10) der zweiten Reihe (15) angeordnet sind.
  4. Rohr (10) nach einem der Ansprüche 1 bis 2, wobei die Kanäle (10) einer der Reihen (15) und die Kanäle (10) der zweiten Reihe paarweise aufeinander ausgerichtet sind.
  5. Rohr nach einem der vorhergehenden Ansprüche, welches entlang des Querschnitts des Rohres eine Länge L Tube und eine Dicke e Tube aufweist, wobei jede der Reihen im Wesentlichen parallel zur Länge des Rohres L Tube ist.
  6. Rohr nach einem der vorhergehenden Ansprüche, wobei zwei aufeinander folgende Kanäle einer Reihe durch einen Abstand d canal/canal getrennt sind, der zwischen 0,2 und 0,4 Millimetern liegt.
  7. Rohr nach einem der vorhergehenden Ansprüche, wobei das Rohr eine äußere Hülle aufweist und die Kanäle einer Reihe eine der äußeren Hülle benachbarte Wand aufweisen, wobei der Abstand d tube/canal zwischen der äußeren Hülle des Rohres und der benachbarten Wand eines Kanals zwischen 0,2 und 0,4 Millimetern liegt.
  8. Wärmetauscher für ein Kraftfahrzeug, welcher mehrere Rohre nach einem der vorhergehenden Ansprüche umfasst, wobei sich die Rohre im Wesentlichen parallel zueinander erstrecken, wobei der Abstand der Achsen von zwei aufeinander folgenden Rohren zwischen 6 und 10 Millimetern liegt, vorzugsweise zwischen 6 und 8 Millimetern.
EP13766330.8A 2012-09-28 2013-09-25 Rohr für einen kraftfahrzeugwärmetauscher Not-in-force EP2901096B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1259161A FR2996296A1 (fr) 2012-09-28 2012-09-28 Tube pour un echangeur de chaleur de vehicule automobile
PCT/EP2013/069908 WO2014048951A1 (fr) 2012-09-28 2013-09-25 Tube pour un echangeur de chaleur de vehicule automobile

Publications (2)

Publication Number Publication Date
EP2901096A1 EP2901096A1 (de) 2015-08-05
EP2901096B1 true EP2901096B1 (de) 2018-08-15

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP13766330.8A Not-in-force EP2901096B1 (de) 2012-09-28 2013-09-25 Rohr für einen kraftfahrzeugwärmetauscher

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EP (1) EP2901096B1 (de)
FR (1) FR2996296A1 (de)
WO (1) WO2014048951A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3021398B1 (fr) 2014-05-23 2019-03-22 Valeo Systemes Thermiques Tube lamine a double rangee de canaux

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59205591A (ja) * 1983-05-09 1984-11-21 Nippon Denso Co Ltd 熱交換器
JP3945208B2 (ja) * 2001-10-09 2007-07-18 株式会社デンソー 熱交換用チューブ及び熱交換器
JP3821113B2 (ja) * 2003-05-23 2006-09-13 株式会社デンソー 熱交換用チューブ
US20050217839A1 (en) * 2004-03-30 2005-10-06 Papapanu Steven J Integral primary and secondary heat exchanger

Non-Patent Citations (1)

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

Also Published As

Publication number Publication date
FR2996296A1 (fr) 2014-04-04
WO2014048951A1 (fr) 2014-04-03
EP2901096A1 (de) 2015-08-05

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