EP0668114A1 - Un outil pour fabriquer des pliages en forme de U dans des tubes d'échangeurs de chaleur qui ont des ailes radiales dans leurs surface interne - Google Patents

Un outil pour fabriquer des pliages en forme de U dans des tubes d'échangeurs de chaleur qui ont des ailes radiales dans leurs surface interne Download PDF

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Publication number
EP0668114A1
EP0668114A1 EP95101548A EP95101548A EP0668114A1 EP 0668114 A1 EP0668114 A1 EP 0668114A1 EP 95101548 A EP95101548 A EP 95101548A EP 95101548 A EP95101548 A EP 95101548A EP 0668114 A1 EP0668114 A1 EP 0668114A1
Authority
EP
European Patent Office
Prior art keywords
tube
tubes
fins
tool
grooves
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.)
Withdrawn
Application number
EP95101548A
Other languages
German (de)
English (en)
Inventor
Andrea Parola
Vittorio Bassignana
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
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 Magneti Marelli Climatizzazione SpA filed Critical Magneti Marelli Climatizzazione SpA
Publication of EP0668114A1 publication Critical patent/EP0668114A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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

Definitions

  • the present invention relates to a tool for making U-shaped bends in heat-exchanger tubes having radial fins projecting from the internal walls of the tubes.
  • a method of bending tubes in order to form so-called "hairpin" bends is known for use with tubes of circular cross-section with smooth internal surfaces.
  • the most widespread system makes use of the rotation of a movable element on an element which acts as a fulcrum, entraining and bending the tube which is interposed between the two elements, with the internal resistance of a restraint core.
  • the subject of the present invention is a tool, characterized in that it comprises a core which is inserted temporarily in an arm of the tube to be bent, and which has a cylindrical surface in contact with the internal wall of the tube between each pair of adjacent fins and a plurality of grooves for housing respective fins.
  • the shape and dimensions of the grooves of the core are determined in a manner such that the insertion of the core, the bending of the tube and the withdrawal of the core from the tube can be achieved easily, without interference and without deformation of the fins.
  • a tool for making U-shaped bends in a heat-exchanger tube 2 is generally indicated 1.
  • the tube to be bent has a plurality of fins 4 which project from the internal wall of the tube.
  • the fins 4 have the purpose of increasing the turbulence of the liquid inside the tubes and increasing the surface area for the exchange of heat between the tube and the liquid and they considerably increase the efficiency of the heat exchanger.
  • each fin 4 is more than 10% of the diameter of the tube and is more than double the thickness of the tube wall
  • the finned tube is therefore readily distinguishable from so-called splined tubes which have shallow incisions in their internal surfaces.
  • the tube has four fins but it is intended that it may have any number of fins.
  • a tool used to make U-shaped bends in a finned tube comprises a wheel 6 with a fixed axis and a wheel 8 which has a movable axis and performs an arcuate movement around the centre of the wheel 6 with the fixed axis.
  • the tube 2 to be bent is disposed between the wheels 6, 8 and the bending is carried out by moving the wheel 8 in the direction indicated by the arrow 10 in Figure 1.
  • a core 12 is inserted in the tube and acts as a restraint during the initial stage of the bending.
  • the core 12 is constituted by a rigid body with cylindrical surfaces 14 which are disposed in contact with the internal wall of the tube between each pair of adjacent fins.
  • the core 12 has a plurality of grooves 16 which house respective fins 4. The dimensions of the grooves are slightly larger than those of the fins of the tube so as to leave the fins free during the bending process.
  • the core 12 has four grooves 16, a first pair of which are diametrally opposed and lie in the plane of the bending of the tube.
  • the one situated on the outside of the bend in the tube has an end portion 16a ( Figure 2) which extends over a toroidal surface 18 defined by a curvature R1 in the bending plane ( Figures 1 and 2) and by a curvature R2 in the plane perpendicular to the bending plane and having the same radius as the internal surface of the tube 2.
  • a second pair of grooves 16, also diametrally opposed, are situated in a plane perpendicular to the bending plane.
  • the grooves of this second pair have flared end portions with first walls 16b situated outside the centre line of the bonding of the tube (indicated A in Figure 1) which are straight and second walls 16c which have curved profiles and are situated inside the centre line of the bending of the tube.
  • the particular shape of the core 12 allows the hairpin-shaped tube to be withdrawn easily upon completion of the bending and enables the tube to be bent without damage to the fins.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
EP95101548A 1994-02-22 1995-02-06 Un outil pour fabriquer des pliages en forme de U dans des tubes d'échangeurs de chaleur qui ont des ailes radiales dans leurs surface interne Withdrawn EP0668114A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO940031U 1994-02-22
ITTO940031 IT232332Y1 (it) 1994-02-22 1994-02-22 Attrezzatura per la piegatura a u di tubi per scambiatori di calore muniti di alette radiali sporgenti dalla parete interna del tubo.

Publications (1)

Publication Number Publication Date
EP0668114A1 true EP0668114A1 (fr) 1995-08-23

Family

ID=11412054

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95101548A Withdrawn EP0668114A1 (fr) 1994-02-22 1995-02-06 Un outil pour fabriquer des pliages en forme de U dans des tubes d'échangeurs de chaleur qui ont des ailes radiales dans leurs surface interne

Country Status (2)

Country Link
EP (1) EP0668114A1 (fr)
IT (1) IT232332Y1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6419885B1 (en) * 1997-06-10 2002-07-16 Exxonmobil Chemical Patents, Inc. Pyrolysis furnace with an internally finned U shaped radiant coil
US6644358B2 (en) 2001-07-27 2003-11-11 Manoir Industries, Inc. Centrifugally-cast tube and related method and apparatus for making same
US20110289775A1 (en) * 2008-08-08 2011-12-01 Delphi Technologies, Inc. Method and apparatus for bending a micro-channel heat exchanger
EP2667073A1 (fr) * 2012-05-21 2013-11-27 Zambelli Fertigungs GmbH & Co. KG Pièce de tuyau à base de tôles de métal et son procédé de fabrication, dispositif de traction et flexion pour fabrication d'un coude de tube et procédé de fabrication d'un coude de tube

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB557998A (en) * 1942-01-02 1943-12-15 Morris Motors Ltd Improvements relating to the bending of tubes
US3561247A (en) * 1968-08-27 1971-02-09 Louis A Pfafman Method for bending tubing
US3580044A (en) * 1969-03-24 1971-05-25 Edwin A De Voss Tube bending mandrel
LU68193A1 (fr) * 1972-09-18 1973-10-16
FR2321345A1 (fr) * 1975-08-19 1977-03-18 Serinox Procede de cintrage a froid de profiles tubulaires
GB2148758A (en) * 1983-11-02 1985-06-05 Norcros Investments Ltd Bending mandrel

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB557998A (en) * 1942-01-02 1943-12-15 Morris Motors Ltd Improvements relating to the bending of tubes
US3561247A (en) * 1968-08-27 1971-02-09 Louis A Pfafman Method for bending tubing
US3580044A (en) * 1969-03-24 1971-05-25 Edwin A De Voss Tube bending mandrel
LU68193A1 (fr) * 1972-09-18 1973-10-16
FR2321345A1 (fr) * 1975-08-19 1977-03-18 Serinox Procede de cintrage a froid de profiles tubulaires
GB2148758A (en) * 1983-11-02 1985-06-05 Norcros Investments Ltd Bending mandrel

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6419885B1 (en) * 1997-06-10 2002-07-16 Exxonmobil Chemical Patents, Inc. Pyrolysis furnace with an internally finned U shaped radiant coil
US6719953B2 (en) 1997-06-10 2004-04-13 Exxonmobil Chemical Patents Inc. Process for the manufacture of olefins by a pyrolysis furnace with an internally finned U shaped radiant coil
US6644358B2 (en) 2001-07-27 2003-11-11 Manoir Industries, Inc. Centrifugally-cast tube and related method and apparatus for making same
US8033767B2 (en) 2001-07-27 2011-10-11 Manoir Industries, Inc. Centrifugally-cast tube and related method and apparatus for making same
US8070401B2 (en) 2001-07-27 2011-12-06 Manoir Industries, Inc. Apparatus for making centrifugally-cast tube
US20110289775A1 (en) * 2008-08-08 2011-12-01 Delphi Technologies, Inc. Method and apparatus for bending a micro-channel heat exchanger
US9415436B2 (en) * 2008-08-08 2016-08-16 Mahle International Gmbh Method and apparatus for bending a micro-channel heat exchanger
EP2667073A1 (fr) * 2012-05-21 2013-11-27 Zambelli Fertigungs GmbH & Co. KG Pièce de tuyau à base de tôles de métal et son procédé de fabrication, dispositif de traction et flexion pour fabrication d'un coude de tube et procédé de fabrication d'un coude de tube

Also Published As

Publication number Publication date
IT232332Y1 (it) 1999-12-17
ITTO940031V0 (it) 1994-02-22
ITTO940031U1 (it) 1995-08-22

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Effective date: 19981222