EP0659500A1 - A method of bending a pipe having an oblong cross-section and a heat exchanger with pipes having an oblong section and bent in a U-shape - Google Patents

A method of bending a pipe having an oblong cross-section and a heat exchanger with pipes having an oblong section and bent in a U-shape Download PDF

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Publication number
EP0659500A1
EP0659500A1 EP94117924A EP94117924A EP0659500A1 EP 0659500 A1 EP0659500 A1 EP 0659500A1 EP 94117924 A EP94117924 A EP 94117924A EP 94117924 A EP94117924 A EP 94117924A EP 0659500 A1 EP0659500 A1 EP 0659500A1
Authority
EP
European Patent Office
Prior art keywords
pipe
section
cross
limbs
connecting portion
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
EP94117924A
Other languages
German (de)
French (fr)
Other versions
EP0659500B1 (en
Inventor
Erminio Michielon
Luigi Dentis
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.)
Denso Thermal Systems SpA
Original Assignee
Borletti Climatizzazione SRL
Magneti Marelli Climatizzazione SpA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Borletti Climatizzazione SRL, Magneti Marelli Climatizzazione SpA filed Critical Borletti Climatizzazione SRL
Publication of EP0659500A1 publication Critical patent/EP0659500A1/en
Application granted granted Critical
Publication of EP0659500B1 publication Critical patent/EP0659500B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F28F9/26—Arrangements for connecting different sections of heat-exchange elements, e.g. of radiators
    • 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
    • B21D11/14—Twisting
    • 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
    • B21D53/08—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of both metal tubes and sheet metal
    • B21D53/085—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of both metal tubes and sheet metal with fins places on zig-zag tubes or parallel tubes
    • 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
    • B21D9/00—Bending tubes using mandrels or the like
    • B21D9/01—Bending tubes using mandrels or the like the mandrel being flexible and engaging the entire tube length
    • 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
    • F28D1/047—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 bent, e.g. in a serpentine or zig-zag
    • F28D1/0477—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 bent, e.g. in a serpentine or zig-zag the conduits being bent in a serpentine or zig-zag
    • F28D1/0478—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 bent, e.g. in a serpentine or zig-zag the conduits being bent in a serpentine or zig-zag the conduits having a non-circular cross-section
    • 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

Definitions

  • the present invention relates to a method of bending a pipe having an oblong cross-section for heat exchangers.
  • the object of the present invention is to provide a method of bending a pipe having an oblong cross-section in a U-shaped arrangement which permits the two limbs of the pipe to be placed in a position in which the longer axes of the respective cross-sections are aligned with or parallel to one another without causing excessive stretching of the material in the bending zone.
  • this object is achieved by a method characterised by the stages of:
  • the present invention also relates to a heat exchanger comprising a stack of fins fixed to a plurality of pipes having an oblong cross-section, in which each pipe has two straight limbs and a curved connecting portion, the heat exchanger being characterised in that the longer axes of the respective cross-sections of the two straight limbs of each pipe are aligned with or parallel to one another, and in that the connecting portion has an oblong cross-section with a longer axis at a right-angle to the longer axes of the cross-sections of the straight limbs.
  • the pipe is indicated by the reference numeral 2 whilst the longer axis of the cross-section of the pipe is indicated 4.
  • a reinforcing core 6 consisting of a flexible element of a shape such that it freely and slidingly engages the hole in the pipe is inserted in the initially straight pipe 2.
  • the reinforcing core 6 is inserted over a length such that it extends over at least the entire pipe-bending zone.
  • a relative rotation substantially equal to 180° of two limbs 2a, 2b of the pipe 2 is caused about a bending axis 8 parallel to the axis 4 of the cross-section of the pipe ( Figure 3).
  • the pipe 2 is bent by a known tool comprising a wheel having a radius equal to the radius of curvature of the pipe and a movable shaping member which urges the pipe against the edge of the wheel, creating the curved connecting portion 2c between the two straight limbs 2a, 2b.
  • the two straight limbs 2a, 2b are located with the longer axes 4 of the respective cross-sections parallel to one another.
  • the reinforcing core 6 is partially removed such that the reinforcing core only extends over one of the two limbs of the pipe and that the end of the core is located approximately in correspondence with the part in which the straight limb starts to curve.
  • a second core 6' ( Figure 4) which is introduced into the limb approximately as far as the point at which the limb joins the curved connecting portion 2c is disposed in the limb which does not have the reinforcing core.
  • a relative rotation of 90° of each of the two limbs 2a, 2b relative to the curved connecting portion 2c is caused about an axis which coincides with or, generally, is parallel to the longitudinal axis of the straight limbs 2a, 2b.
  • This relative rotation is performed by immobilising the connecting portion 2c and holding the straight limbs 2a, 2b from the exterior with gripper members which impart the necessary rotation.
  • the pipe assumes the shape shown in Figure 4, with the longer axes 4 of the straight limbs 2a, 2b aligned relative to one another or, in general, parallel to one another.
  • the reinforcing cores 6, 6' are then withdrawn and a plurality of fins which are secured to the pipes by expansion of the pipes, according to a known technology, are then fitted on the straight limbs 2a, 2b of a series of parallel pipes.
  • the object of the flexible reinforcing core is to prevent the pipe from yielding.
  • the same result can be obtained by introducing a material which melts at a temperature far lower than the melting temperature of the material forming the pipe into the pipe. This material is introduced into the pipe in the liquid state and is solidified before the bending process is performed. At the end of the bending operations, this material is removed again in the liquid state by heating the pipe.
  • Figure 1 shows schematically a heat exchanger with pipes having an oblong section and bent according to the process described above.
  • the flow of air strikes the heat exchanger in the direction indicated by the arrows A in Figure 1 and the pipes are located with their longer axis parallel to the direction of the air flow in a manner similar to that which occurs in heat exchangers having two collector tanks situated at the opposite ends of the stack of sheets.
  • the fact that the longer axes 4 of the pipes are aligned with or parallel to one another enables a liquid inlet zone and a return zone to be provided in the collector tank by means of a simple longitudinal separating plate schematically indicated 10 in Figure 6.

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

Abstract

A method of bending a pipe having an oblong cross-section for heat exchangers comprises the stages of causing a relative rotation which is substantially equal to 180° between two limbs (2a, 2b) of the pipe (2) about an axis (8) parallel to the longer axis (4) of the cross-section of the pipe so as to obtain two straight limbs (2a, 2b) connected to one another by a curved connecting portion (2c) and to cause a relative rotation which is substantially equal to 90° between each of the straight limbs (2a, 2b) and the connecting portion (2c).

Description

  • The present invention relates to a method of bending a pipe having an oblong cross-section for heat exchangers.
  • In heat exchangers of the mechanical expansion type (in which the stack of fins is secured to the pipes by a pipe expanding or mechanical expansion process), the use of pipes bent in a U-shape (so-called forked pipes) enables a collector plate and a tank for recirculating the refrigerating fluid to be dispensed with, evidently saving material and increasing the reliability of the heat exchanger since, with the same number of pipes, the fluidtight points present as a whole are reduced by half.
  • The use of forked pipes is common today for aluminium or copper pipes with a circular section, whilst, for pipes having a flat or oblong section, it is difficult and, in fact, impracticable, when the flat pipe has to be bent in a U-shape and the two limbs of the fork maintained aligned along the longer axis of their cross-section.
  • The object of the present invention is to provide a method of bending a pipe having an oblong cross-section in a U-shaped arrangement which permits the two limbs of the pipe to be placed in a position in which the longer axes of the respective cross-sections are aligned with or parallel to one another without causing excessive stretching of the material in the bending zone.
  • According to the present invention, this object is achieved by a method characterised by the stages of:
    • causing a relative rotation substantially equal to 180° between two limbs of the pipe about an axis parallel to the longer axis of the cross-section of the pipe, so as to obtain two straight limbs with longer axes of the respective cross-sections parallel to one another and connected to one another by a curved connecting portion; and
    • causing a relative rotation between each of the straight limbs and the connecting portion about an axis coinciding with or parallel to the longitudinal axis of the straight limbs.
  • The present invention also relates to a heat exchanger comprising a stack of fins fixed to a plurality of pipes having an oblong cross-section, in which each pipe has two straight limbs and a curved connecting portion, the heat exchanger being characterised in that the longer axes of the respective cross-sections of the two straight limbs of each pipe are aligned with or parallel to one another, and in that the connecting portion has an oblong cross-section with a longer axis at a right-angle to the longer axes of the cross-sections of the straight limbs.
  • Further characteristics and advantages of the present invention will become clear from the following detailed description given purely by way of non-limiting example, with reference to the appended drawings, in which:
    • Figure 1 is a schematic perspective view of a heat exchanger according to the present invention;
    • Figures 2, 3 and 4 illustrate schematically the bending stages of a pipe;
    • Figure 5 is a view of the connecting portion of a pipe along the arrow V of Figure 1; and
    • Figure 6 is a view of the pipe bent along the arrow VI of Figure 5.
  • Referring firstly to Figures 2, 3 and 4, a method is described for bending a pipe having an oblong cross-section into a U-shape. In the example illustrated in the drawings, reference is made to a pipe with a flat section, however, it will be understood that the process according to the invention can generally be adapted to pipes with an oblong section, this term covering oval, ovoid, etc, sections and in general sections in which it is possible to differentiate between a longer axis and a shorter axis of different lengths.
  • In the drawings, the pipe is indicated by the reference numeral 2 whilst the longer axis of the cross-section of the pipe is indicated 4.
  • With reference to Figure 2, a reinforcing core 6 consisting of a flexible element of a shape such that it freely and slidingly engages the hole in the pipe is inserted in the initially straight pipe 2. The reinforcing core 6 is inserted over a length such that it extends over at least the entire pipe-bending zone. When the core has been inserted, a relative rotation substantially equal to 180° of two limbs 2a, 2b of the pipe 2 is caused about a bending axis 8 parallel to the axis 4 of the cross-section of the pipe (Figure 3).
  • The pipe 2 is bent by a known tool comprising a wheel having a radius equal to the radius of curvature of the pipe and a movable shaping member which urges the pipe against the edge of the wheel, creating the curved connecting portion 2c between the two straight limbs 2a, 2b.
  • When the pipe has been bent into the U-shape, the two straight limbs 2a, 2b are located with the longer axes 4 of the respective cross-sections parallel to one another. After this first bending of the pipe 2, the reinforcing core 6 is partially removed such that the reinforcing core only extends over one of the two limbs of the pipe and that the end of the core is located approximately in correspondence with the part in which the straight limb starts to curve. A second core 6' (Figure 4) which is introduced into the limb approximately as far as the point at which the limb joins the curved connecting portion 2c is disposed in the limb which does not have the reinforcing core.
  • At this point, a relative rotation of 90° of each of the two limbs 2a, 2b relative to the curved connecting portion 2c is caused about an axis which coincides with or, generally, is parallel to the longitudinal axis of the straight limbs 2a, 2b. This relative rotation is performed by immobilising the connecting portion 2c and holding the straight limbs 2a, 2b from the exterior with gripper members which impart the necessary rotation. At the end of this operation, the pipe assumes the shape shown in Figure 4, with the longer axes 4 of the straight limbs 2a, 2b aligned relative to one another or, in general, parallel to one another. The reinforcing cores 6, 6' are then withdrawn and a plurality of fins which are secured to the pipes by expansion of the pipes, according to a known technology, are then fitted on the straight limbs 2a, 2b of a series of parallel pipes.
  • During the pipe-bending process, the object of the flexible reinforcing core is to prevent the pipe from yielding. The same result can be obtained by introducing a material which melts at a temperature far lower than the melting temperature of the material forming the pipe into the pipe. This material is introduced into the pipe in the liquid state and is solidified before the bending process is performed. At the end of the bending operations, this material is removed again in the liquid state by heating the pipe.
  • Figure 1 shows schematically a heat exchanger with pipes having an oblong section and bent according to the process described above. The flow of air strikes the heat exchanger in the direction indicated by the arrows A in Figure 1 and the pipes are located with their longer axis parallel to the direction of the air flow in a manner similar to that which occurs in heat exchangers having two collector tanks situated at the opposite ends of the stack of sheets. The fact that the longer axes 4 of the pipes are aligned with or parallel to one another enables a liquid inlet zone and a return zone to be provided in the collector tank by means of a simple longitudinal separating plate schematically indicated 10 in Figure 6.

Claims (6)

  1. A method of bending a pipe having an oblong cross-section for heat exchangers, characterised in that it comprises the stages of:
    - causing a relative rotation substantially equal to 180° between two limbs (2a, 2b) of the pipe (2) about an axis (8) parallel to the longer axis (4) of the cross-section of the pipe, so as to obtain two straight limbs with longer axes (4) of the respective cross-sections parallel to one another and connected to one another by a curved connecting portion (2c); and
    - causing a relative rotation between each of the above straight limbs (2a, 2b) and the connecting portion (2c) about an axis coinciding with or parallel to the longitudinal axis of the straight limbs.
  2. A method according to Claim 1, characterised in that the relative rotation between each of the straight limbs (2a, 2b) and the connecting portion is substantially equal to 90°.
  3. A method according to Claim 1, characterised in that the pipe (2) is bent by inserting a reinforcing core (6, 6') in the pipe (2) beforehand.
  4. A method according to Claim 3, characterised in that the reinforcing core is a flexible element (6, 6') which can slide freely in the pipe (2).
  5. A method according to Claim 3, characterized in that the reinforcing core (6, 6') is produced by a material which melts at a temperature which is substantially lower than the melting temperature of the material constituting the pipes, the material being introduced into the pipe (2) in the liquid state and being made to solidify before the bending method is performed, the molten material then being removed from the pipe (2) in the liquid state by heating the pipe (2).
  6. A heat exchanger comprising a stack of fins secured to a plurality of pipes (2) having an oblong cross-section, in which each pipe (2) has two straight limbs (2a, 2b) and a curved connecting portion (2c), characterised in that the longer axes of the respective cross-sections of the two straight limbs (2a, 2b) of each pipe (2) are aligned with or parallel to one another, and in that the connecting portion (2c) has an oblong cross-section with a longer axis at a right-angle to the longer axes of the cross-sections of the straight limbs (2a, 2b).
EP94117924A 1993-12-20 1994-11-14 A method of bending a pipe having an oblong cross-section and a heat exchanger with pipes having an oblong section and bent in a U-shape Expired - Lifetime EP0659500B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO930968 1993-12-20
ITTO930968A IT1272091B (en) 1993-12-20 1993-12-20 PROCEDURE FOR BENDING AN OBLONG CROSS-SECTION TUBE AND HEAT EXCHANGER WITH U-SHAPED U-SHAPED TUBES

Publications (2)

Publication Number Publication Date
EP0659500A1 true EP0659500A1 (en) 1995-06-28
EP0659500B1 EP0659500B1 (en) 1998-01-14

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EP94117924A Expired - Lifetime EP0659500B1 (en) 1993-12-20 1994-11-14 A method of bending a pipe having an oblong cross-section and a heat exchanger with pipes having an oblong section and bent in a U-shape

Country Status (4)

Country Link
EP (1) EP0659500B1 (en)
DE (1) DE69407940T2 (en)
ES (1) ES2113038T3 (en)
IT (1) IT1272091B (en)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19649129A1 (en) * 1996-11-27 1998-05-28 Behr Gmbh & Co Flat tube heat exchanger with shaped flat tube end section
DE19830863A1 (en) * 1998-07-10 2000-01-13 Behr Gmbh & Co Flat tube with transverse offset reversing bend section and thus built-up heat exchanger
EP1189038A1 (en) * 2000-09-14 2002-03-20 Endress + Hauser Flowtec AG Method of bending measuring tubes
US6591656B1 (en) 2000-09-14 2003-07-15 Endress + Hauser Flowtec Ag Process for bending measuring tubes
EP1413844A2 (en) 2002-10-25 2004-04-28 Bayer Aktiengesellschaft Temperature control channels
DE10306848A1 (en) * 2003-02-18 2004-08-26 Behr Gmbh & Co. Kg Flat tube with bend section forming heat exchanger for gas cooler or evaporator has bent over section with main bend axis parallel to flat tube plane and at definable angle to pipe length
EP1486749A2 (en) 2003-06-12 2004-12-15 Bayer Industry Services GmbH & Co. OHG Turbulator
CN101532786B (en) * 2008-03-11 2012-07-18 昭和电工株式会社 Heat exchanger
CN109990627A (en) * 2017-12-29 2019-07-09 浙江盾安机械有限公司 A kind of snakelike flat pipe heat exchanger of multilayer and its processing technology
CN113454409A (en) * 2019-02-21 2021-09-28 Bsh家用电器有限公司 Evaporator for a refrigeration device and refrigeration device
CN113732198A (en) * 2020-05-31 2021-12-03 杭州三花微通道换热器有限公司 Heat exchanger and processing method thereof
EP4317899A1 (en) * 2022-08-04 2024-02-07 Valeo Systemes Thermiques A tube for a heat exchanger

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1108189A (en) * 1953-11-04 1956-01-10 Western Electric Co Mandrel for performing twists in tubular parts with non-circular cross-section
FR2222623A1 (en) * 1973-03-22 1974-10-18 Chausson Usines Sa Multi-tube motor vehicle radiator - has vert. U-shaped tubes joining separate sections of single water box
FR2321345A1 (en) * 1975-08-19 1977-03-18 Serinox Polyethylene plug supports for bending metallic tubing - for forming tight bends without creasing
FR2547751A1 (en) * 1983-06-22 1984-12-28 Snecma Method of bending a metal tube
US4625378A (en) * 1983-05-09 1986-12-02 Matsushita Refrigeration Company Method of manufacturing fin-tube heat exchangers

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1108189A (en) * 1953-11-04 1956-01-10 Western Electric Co Mandrel for performing twists in tubular parts with non-circular cross-section
FR2222623A1 (en) * 1973-03-22 1974-10-18 Chausson Usines Sa Multi-tube motor vehicle radiator - has vert. U-shaped tubes joining separate sections of single water box
FR2321345A1 (en) * 1975-08-19 1977-03-18 Serinox Polyethylene plug supports for bending metallic tubing - for forming tight bends without creasing
US4625378A (en) * 1983-05-09 1986-12-02 Matsushita Refrigeration Company Method of manufacturing fin-tube heat exchangers
FR2547751A1 (en) * 1983-06-22 1984-12-28 Snecma Method of bending a metal tube

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19649129A1 (en) * 1996-11-27 1998-05-28 Behr Gmbh & Co Flat tube heat exchanger with shaped flat tube end section
EP0845647A1 (en) 1996-11-27 1998-06-03 Behr GmbH & Co. Flat tube heat exchanger with twisted tube ends
DE19830863A1 (en) * 1998-07-10 2000-01-13 Behr Gmbh & Co Flat tube with transverse offset reversing bend section and thus built-up heat exchanger
WO2000003190A1 (en) 1998-07-10 2000-01-20 Ford-Werke Aktiengesellschaft Flat tube with transversally offset u-bend section and heat exchanger configured using same
US6546999B1 (en) 1998-07-10 2003-04-15 Visteon Global Technologies, Inc. Flat tubes for heat exchanger
EP1189038A1 (en) * 2000-09-14 2002-03-20 Endress + Hauser Flowtec AG Method of bending measuring tubes
US6591656B1 (en) 2000-09-14 2003-07-15 Endress + Hauser Flowtec Ag Process for bending measuring tubes
EP1413844A2 (en) 2002-10-25 2004-04-28 Bayer Aktiengesellschaft Temperature control channels
DE10306848A1 (en) * 2003-02-18 2004-08-26 Behr Gmbh & Co. Kg Flat tube with bend section forming heat exchanger for gas cooler or evaporator has bent over section with main bend axis parallel to flat tube plane and at definable angle to pipe length
WO2004074756A2 (en) 2003-02-18 2004-09-02 Behr Gmbh & Co. Kg Flat pipe comprising a return bend section and a heat exchanger constructed therewith
EP1486749A2 (en) 2003-06-12 2004-12-15 Bayer Industry Services GmbH & Co. OHG Turbulator
DE10326381B4 (en) * 2003-06-12 2005-09-22 Jähn, Peter turbulence generator
CN101532786B (en) * 2008-03-11 2012-07-18 昭和电工株式会社 Heat exchanger
CN109990627A (en) * 2017-12-29 2019-07-09 浙江盾安机械有限公司 A kind of snakelike flat pipe heat exchanger of multilayer and its processing technology
CN113454409A (en) * 2019-02-21 2021-09-28 Bsh家用电器有限公司 Evaporator for a refrigeration device and refrigeration device
CN113732198A (en) * 2020-05-31 2021-12-03 杭州三花微通道换热器有限公司 Heat exchanger and processing method thereof
EP4317899A1 (en) * 2022-08-04 2024-02-07 Valeo Systemes Thermiques A tube for a heat exchanger
WO2024028070A1 (en) * 2022-08-04 2024-02-08 Valeo Systemes Thermiques A tube for heat exchanger

Also Published As

Publication number Publication date
ES2113038T3 (en) 1998-04-16
ITTO930968A1 (en) 1995-06-20
DE69407940D1 (en) 1998-02-19
DE69407940T2 (en) 1998-04-23
ITTO930968A0 (en) 1993-12-20
IT1272091B (en) 1997-06-11
EP0659500B1 (en) 1998-01-14

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