EP3399266A1 - A flat tube for a heat exchanger and a heat exchanger - Google Patents

A flat tube for a heat exchanger and a heat exchanger Download PDF

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Publication number
EP3399266A1
EP3399266A1 EP17169136.3A EP17169136A EP3399266A1 EP 3399266 A1 EP3399266 A1 EP 3399266A1 EP 17169136 A EP17169136 A EP 17169136A EP 3399266 A1 EP3399266 A1 EP 3399266A1
Authority
EP
European Patent Office
Prior art keywords
tube
wall
nose
multilayer
heat exchanger
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.)
Granted
Application number
EP17169136.3A
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German (de)
French (fr)
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EP3399266B1 (en
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
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Valeo Systemes Thermiques SAS
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Priority to EP17169136.3A priority Critical patent/EP3399266B1/en
Publication of EP3399266A1 publication Critical patent/EP3399266A1/en
Application granted granted Critical
Publication of EP3399266B1 publication Critical patent/EP3399266B1/en
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    • 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
    • F28D1/03—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 plate-like or laminated conduits
    • F28D1/0391—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 plate-like or laminated conduits a single plate being bent to form one or more 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
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/02—Tubular elements of cross-section which is non-circular

Definitions

  • the object of the invention is a flat tube for a heat exchanger and a heat exchanger.
  • tubes for heat exchangers for example condensers, which are used to guide a fluid and enable its cooling.
  • Such heat exchangers can be implemented in vehicles, e.g. cars. These vehicles are directly exposed to debris such as stones or other objects, either when they are moving or when they are stationary. The stones can travel at significant speed and can impact the heat exchanger, which in most cases is situated in front of the car and is at least partly exposed or can be reached after passing through the radiator grill. Impact of such objects can cause damage to the elements of the heat exchanger, which may lead to leaks of the fluid flowing through them and/or to deterioration of their performance.
  • the object of invention is a flat tube for a heat exchanger, with two open ends defining its longitudinal direction, comprising a first wall and a second wall which are flat and parallel to each other, thereby delimiting the inner space of the tube, wherein one of the lateral sides of the first wall forms a multilayer nose by means of consecutive folds compounded towards the second wall, the lateral side of the second wall being bent to cover said multilayer nose, wherein the folds are at least partially displaced laterally towards the inner side of the tube with respect to the first bending point of said lateral side of the first wall.
  • the inner facing arched portions of the folds laterally precede the first bending point of the multilayer nose.
  • the lateral side of the second wall, bent over the multilayer nose is also double walled.
  • the lateral side of the second wall, bent over the multilayer nose consists of one layer.
  • the thickness of the reinforced tube nose in lateral direction is in the range [0.5 x tube height ; 1.5 x tube height] and preferentially in the range [0.5 x tube height; tube height].
  • Another object of the invention is a heat exchanger comprising a described tube.
  • Fig. 1 presents a general shape of a flat tube which is an object of the invention.
  • the invention specifically regards tube nose, which is depicted in detail in the following figures.
  • the tube is defined by reference to general directions: longitudinal and lateral. These are presented in Fig. 1 , as y axis and x axis, respectively.
  • the reinforced tube nose can be located on the front area of the heat exchanger (e.g. condenser), e.g. facing the road.
  • the heat exchanger e.g. condenser
  • Fig. 2 shows a first example of the flat tube.
  • the tube comprises a first wall 1 and a second wall 2, which are flat and parallel to each other. Together they delimit the inner space of the tube.
  • the tube has two opened ends, which define a longitudinal direction of the tube and a general path for the fluid flow.
  • the tube can further comprise an inner fin.
  • the fin is however optional.
  • One of the lateral sides of the first wall 1 forms a multilayer nose 4 by means of consecutive folds compounded towards the second wall 2.
  • the lateral side 6 of the second wall 2 is bent to cover said multilayer nose 4.
  • the folds are at least partially displaced laterally towards the inner side of the tube with respect to the first bending point 20 of said lateral side of the first wall 1.
  • the multilayer nose is constituted by flat portions of first and second walls 1, 2 and multiple layers of the multilayer nose 4.
  • the inner facing arched portions 10 of the folds laterally precede the first bending point 20 of the multilayer nose 4.
  • the folds of the multilayer nose 4 are substantially parallel to the first and second walls.
  • planes of the folds are parallel to planes of the first wall 1 and the second wall 2.
  • the respective end of the second wall 2 is bent around the multilayer nose 4 so that it encompasses it.
  • this end consists of a single layer.
  • the lateral end of the second wall 2 forms a side wall 6, which covers the multilayer nose 4 of the first wall 1. This further strengthens the tube. At the same time it protects the multilayer nose 4 and enables the tube to have a unitary, unobtrusive shape.
  • Fig. 3 shows the second example of the tube.
  • the side wall 6 is also double walled. This fold extends along the circumference of the multilayer nose 4.
  • the examples present folds of certain lateral length.
  • the lateral length of folds of the multilayer nose 4 is dependent on the lateral length of the walls of the multilayer nose 4. The longer the folds, the more resistant the nose of the tube, as the thicknesses of the multilayer nose 4 and the side of the second wall 6 compound at longer distance.
  • the tube according to the invention may be a tube made of a single sheet of material. It can also be made of two sheets of material, constituting for example separately its first and second walls. Consequently, the disclosed nose of the tube can be present on one lateral side of the tube, or both lateral sides of the tube.
  • the thickness of the reinforced tube nose can be in the range [0.5 x tube height ; 1.5 x tube height] and preferentially in the range [0.5 x tube height; tube height].
  • the tube height here is defined along an axis perpendicular to longitudinal and lateral directions.
  • These tubes can be produced by roll forming, similar to the process for currently known tubes with bends or folds.

Landscapes

  • 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)

Abstract

Flat tube for a heat exchanger, with two open ends defining its longitudinal direction, comprising a first wall (1) and a second wall (2) which are flat and parallel to each other, thereby delimiting the inner space of the tube, wherein one of the lateral sides of the first wall (1) forms a multilayer nose (4) by means of consecutive folds compounded towards the second wall (2), the lateral side (6) of the second wall (2) being bent to cover said multilayer nose (4), wherein the folds are at least partially displaced laterally towards the inner side of the tube with respect to the first bending point (20) of said lateral side of the first wall (1).

Description

  • The object of the invention is a flat tube for a heat exchanger and a heat exchanger.
  • There are known in the art tubes for heat exchangers, for example condensers, which are used to guide a fluid and enable its cooling.
  • Such heat exchangers can be implemented in vehicles, e.g. cars. These vehicles are directly exposed to debris such as stones or other objects, either when they are moving or when they are stationary. The stones can travel at significant speed and can impact the heat exchanger, which in most cases is situated in front of the car and is at least partly exposed or can be reached after passing through the radiator grill. Impact of such objects can cause damage to the elements of the heat exchanger, which may lead to leaks of the fluid flowing through them and/or to deterioration of their performance.
  • It is thus desirable to provide an improved tube for a heat exchanger, which would be more resistant to debris and consequently which would reduce a chance of leakage and/or decrease in performance.
  • The object of invention is a flat tube for a heat exchanger, with two open ends defining its longitudinal direction, comprising a first wall and a second wall which are flat and parallel to each other, thereby delimiting the inner space of the tube, wherein one of the lateral sides of the first wall forms a multilayer nose by means of consecutive folds compounded towards the second wall, the lateral side of the second wall being bent to cover said multilayer nose, wherein the folds are at least partially displaced laterally towards the inner side of the tube with respect to the first bending point of said lateral side of the first wall.
  • Preferably, the inner facing arched portions of the folds laterally precede the first bending point of the multilayer nose.
  • Preferably, the lateral side of the second wall, bent over the multilayer nose, is also double walled.
  • Preferably, the lateral side of the second wall, bent over the multilayer nose, consists of one layer.
  • Preferably, the thickness of the reinforced tube nose in lateral direction is in the range [0.5 x tube height ; 1.5 x tube height] and preferentially in the range [0.5 x tube height; tube height].
  • Another object of the invention is a heat exchanger comprising a described tube.
  • The object of the invention has been presented by means of a drawing, in which:
    • Fig. 1 shows a general shape of a flat tube,
    • Fig. 2 presents a tube according to a first example,
    • Fig. 3 presents a tube according to a second example.
  • Fig. 1 presents a general shape of a flat tube which is an object of the invention. The invention specifically regards tube nose, which is depicted in detail in the following figures. The tube is defined by reference to general directions: longitudinal and lateral. These are presented in Fig. 1, as y axis and x axis, respectively. The reinforced tube nose can be located on the front area of the heat exchanger (e.g. condenser), e.g. facing the road.
  • Fig. 2 shows a first example of the flat tube. The tube comprises a first wall 1 and a second wall 2, which are flat and parallel to each other. Together they delimit the inner space of the tube. The tube has two opened ends, which define a longitudinal direction of the tube and a general path for the fluid flow. The tube can further comprise an inner fin. The fin is however optional. One of the lateral sides of the first wall 1 forms a multilayer nose 4 by means of consecutive folds compounded towards the second wall 2. The lateral side 6 of the second wall 2 is bent to cover said multilayer nose 4. The folds are at least partially displaced laterally towards the inner side of the tube with respect to the first bending point 20 of said lateral side of the first wall 1. This means that there is at least one cross-section of the tube in which the multilayer nose is constituted by flat portions of first and second walls 1, 2 and multiple layers of the multilayer nose 4. Preferably, the inner facing arched portions 10 of the folds laterally precede the first bending point 20 of the multilayer nose 4.
  • Preferably, the folds of the multilayer nose 4 are substantially parallel to the first and second walls. In other words, planes of the folds are parallel to planes of the first wall 1 and the second wall 2.
  • The respective end of the second wall 2 is bent around the multilayer nose 4 so that it encompasses it. In this example, this end consists of a single layer. In other words, the lateral end of the second wall 2 forms a side wall 6, which covers the multilayer nose 4 of the first wall 1. This further strengthens the tube. At the same time it protects the multilayer nose 4 and enables the tube to have a unitary, unobtrusive shape.
  • Fig. 3 shows the second example of the tube. In this example, the side wall 6 is also double walled. This fold extends along the circumference of the multilayer nose 4.
  • The examples present folds of certain lateral length. The lateral length of folds of the multilayer nose 4 is dependent on the lateral length of the walls of the multilayer nose 4. The longer the folds, the more resistant the nose of the tube, as the thicknesses of the multilayer nose 4 and the side of the second wall 6 compound at longer distance.
  • The tube according to the invention may be a tube made of a single sheet of material. It can also be made of two sheets of material, constituting for example separately its first and second walls. Consequently, the disclosed nose of the tube can be present on one lateral side of the tube, or both lateral sides of the tube. The thickness of the reinforced tube nose can be in the range [0.5 x tube height ; 1.5 x tube height] and preferentially in the range [0.5 x tube height; tube height]. The tube height here is defined along an axis perpendicular to longitudinal and lateral directions.
  • These tubes can be produced by roll forming, similar to the process for currently known tubes with bends or folds.

Claims (6)

  1. A flat tube for a heat exchanger, with two open ends defining its longitudinal direction, comprising a first wall (1) and a second wall (2) which are flat and parallel to each other, thereby delimiting the inner space of the tube, wherein one of the lateral sides of the first wall (1) forms a multilayer nose (4) by means of consecutive folds compounded towards the second wall (2), the lateral side (6) of the second wall (2) being bent to cover said multilayer nose (4), wherein the folds are at least partially displaced laterally towards the inner side of the tube with respect to the first bending point (20) of said lateral side of the first wall (1).
  2. The tube according to claim 1, wherein the inner facing arched portions (10) of the folds laterally precede the first bending point (20) of the multilayer nose (4).
  3. The tube according to any preceding claim, wherein the lateral side of the second wall (2), bent over the multilayer nose (4), is also double walled.
  4. The tube according to any of claims 1-2, wherein the lateral side of the second wall (2), bent over the multilayer nose (4), consists of one layer.
  5. The tube according to any preceding claim, wherein the thickness of the reinforced tube nose in lateral direction is in the range [0.5 x tube height ; 1.5 x tube height] and preferentially in the range [0.5 x tube height; tube height].
  6. A heat exchanger comprising a tube according to any of claims 1-5.
EP17169136.3A 2017-05-02 2017-05-02 A flat tube for a heat exchanger and a heat exchanger Active EP3399266B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP17169136.3A EP3399266B1 (en) 2017-05-02 2017-05-02 A flat tube for a heat exchanger and a heat exchanger

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17169136.3A EP3399266B1 (en) 2017-05-02 2017-05-02 A flat tube for a heat exchanger and a heat exchanger

Publications (2)

Publication Number Publication Date
EP3399266A1 true EP3399266A1 (en) 2018-11-07
EP3399266B1 EP3399266B1 (en) 2023-05-31

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EP17169136.3A Active EP3399266B1 (en) 2017-05-02 2017-05-02 A flat tube for a heat exchanger and a heat exchanger

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EP (1) EP3399266B1 (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998044306A1 (en) * 1997-03-28 1998-10-08 Sanden Corporation Heat exchanger tube and method of its manufacture
DE19753724A1 (en) * 1997-12-04 1999-06-10 Behr Gmbh & Co Heat transfer device e.g. for cooling engine oil in vehicles
WO2007084984A2 (en) * 2006-01-19 2007-07-26 Modine Manufacturing Company Flat tube, flat tube heat exchanger, and method of manufacturing same
DE102006016711A1 (en) * 2006-04-08 2007-10-11 Modine Manufacturing Co., Racine Heat exchanger tube comprises first thin sheet of material partially forming broad and narrow sides of tube body and partially enclosing an interior space, and second sheet of material partially forming fin brazed to tube body
US20090019695A1 (en) * 2006-01-19 2009-01-22 Werner Zobel Flat tube, flat tube heat exchanger, and method of manufacturing same
EP3096102A1 (en) * 2015-05-22 2016-11-23 Delphi Automotive Systems Luxembourg SA Flat tube for a heat exchanger

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998044306A1 (en) * 1997-03-28 1998-10-08 Sanden Corporation Heat exchanger tube and method of its manufacture
DE19753724A1 (en) * 1997-12-04 1999-06-10 Behr Gmbh & Co Heat transfer device e.g. for cooling engine oil in vehicles
WO2007084984A2 (en) * 2006-01-19 2007-07-26 Modine Manufacturing Company Flat tube, flat tube heat exchanger, and method of manufacturing same
US20090019695A1 (en) * 2006-01-19 2009-01-22 Werner Zobel Flat tube, flat tube heat exchanger, and method of manufacturing same
DE102006016711A1 (en) * 2006-04-08 2007-10-11 Modine Manufacturing Co., Racine Heat exchanger tube comprises first thin sheet of material partially forming broad and narrow sides of tube body and partially enclosing an interior space, and second sheet of material partially forming fin brazed to tube body
EP3096102A1 (en) * 2015-05-22 2016-11-23 Delphi Automotive Systems Luxembourg SA Flat tube for a heat exchanger

Also Published As

Publication number Publication date
EP3399266B1 (en) 2023-05-31

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