WO2001038814A1 - Echangeur thermique pour refroidir des gaz d'echappement et procede pour produire un tuyau pour un echangeur thermique - Google Patents

Echangeur thermique pour refroidir des gaz d'echappement et procede pour produire un tuyau pour un echangeur thermique Download PDF

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Publication number
WO2001038814A1
WO2001038814A1 PCT/EP2000/011189 EP0011189W WO0138814A1 WO 2001038814 A1 WO2001038814 A1 WO 2001038814A1 EP 0011189 W EP0011189 W EP 0011189W WO 0138814 A1 WO0138814 A1 WO 0138814A1
Authority
WO
WIPO (PCT)
Prior art keywords
tube
heat exchanger
elevation
producing
embossing
Prior art date
Application number
PCT/EP2000/011189
Other languages
German (de)
English (en)
Inventor
Gerd Lotzgeselle
Original Assignee
Volkswagen Aktiengesellschaft
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 Volkswagen Aktiengesellschaft filed Critical Volkswagen Aktiengesellschaft
Priority to AU13939/01A priority Critical patent/AU1393901A/en
Publication of WO2001038814A1 publication Critical patent/WO2001038814A1/fr

Links

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
    • F28F1/08—Tubular elements crimped or corrugated in longitudinal 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
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/42—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being both outside and inside the tubular element
    • 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
    • F28F1/42—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being both outside and inside the tubular element
    • F28F1/424—Means comprising outside portions integral with inside portions
    • F28F1/426—Means comprising outside portions integral with inside portions the outside portions and the inside portions forming parts of complementary shape, e.g. concave and convex
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F28F13/06—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media
    • 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
    • F28D21/0001—Recuperative heat exchangers
    • F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases

Definitions

  • Heat exchanger for cooling exhaust gases and a method for producing a tube for a heat exchanger
  • the invention relates to a heat exchanger for cooling exhaust gases, which comprises at least one tube which has at least one elevation on the inside of its tube wall, which protrudes into the interior of the tube.
  • the invention further relates to a method for producing a tube for a heat exchanger.
  • Heat exchangers are used to cool and heat media. In operation, two gaseous, vaporous or liquid media at different temperatures flow through them. The media are separated from each other in the heat exchanger by a solid wall. The heat of the warmer medium is transferred to the colder medium via the wall by heat conduction.
  • Heat exchangers are used, for example, in exhaust gas recirculation systems in which the exhaust air of an internal combustion engine is cooled using a heat exchanger.
  • Exhaust gas recirculation systems are described in US 5 617 726 and US 5 425 239. In these systems, the cooled exhaust gas flow is returned to the combustion chamber and a reduction in the No x and soot values is achieved due to the cooling of the exhaust gas flow.
  • a heat exchanger for cooling exhaust gas is known from DE 195 40 683 A1.
  • a bundle of rectangular tubes is provided as the flow channel for the exhaust gas.
  • the rectangular pipes are each welded together from two pipe shells and provided with pairs of tabs which project inwards from opposite walls. These are at an angle to Flow direction of the exhaust gas arranged and act as interference edges.
  • the pipe halves are first provided with the tabs and then welded together.
  • the tabs can be welded to the tube halves, inserted into the slots provided or formed by deep drawing and pressing the tube halves together.
  • a disadvantage of this heat exchanger is that the large manufacturing effort in the manufacture causes high costs.
  • the heat exchanger consists of a helically corrugated tube made of corrosion-resistant metal, through which the exhaust gas flows. This tube is concentrically surrounded by another metal tube. A heat exchange medium flows through the space between the tubes.
  • the corrugated tube has a corrugated tube wall. The wave crests of the corrugation form elevations on the inside of the tube wall, which protrude into the interior of the tube. They cause the flow to swirl, which leads to an increase in the heat exchange rate.
  • the method for producing a heat exchanger described in the cited publication comprises several steps.
  • a band made of a corrosion-resistant material is formed into the slotted tube along the length.
  • the longitudinal seam of the slotted tube is then welded.
  • the welded tube is corrugated in a helical shape and this is passed through a shaping device displacing the corrugation.
  • a metal strip is formed around the corrugated pipe, running longitudinally into the pipe, welded along the longitudinal seam and snugly fitted onto the corrugated pipe.
  • the object is achieved by a heat exchanger with the features of claim 1.
  • Advantageous further developments of the heat exchanger result from the subclaims.
  • the heat exchanger according to the invention comprises at least one tube which has at least one elevation on the inside of its tube wall, which protrudes into the interior of the tube.
  • the at least one elevation was created by embossing the pipe wall from the outside.
  • the production of such a heat exchanger proves to be particularly simple and therefore inexpensive. It is not necessary, as in the prior art, to attach interfering edges to the inside of the pipe wall in complex process steps or to produce a corrugated pipe in a multi-stage process.
  • the tubes of the heat exchanger according to the invention are only embossed from the outside, so that the tube wall is deformed at the point at which the embossing die attaches and an elevation is formed on the inside of the tube wall.
  • any number of surveys can be generated at different locations as required.
  • the shape of the survey is given by the shape of the stamp used, the amount of the survey by the contact pressure.
  • the heat exchanger according to the invention can also be adapted subsequently to rapidly changing requirements by introducing further embossments into the tube.
  • the exhaust air to be cooled flows through the heat exchanger tube or tubes and a cooling medium flows around it.
  • the interior of the pipe represents the flow channel for the exhaust air.
  • the elevation formed by the embossing projects into the interior and thus into the flow channel and causes turbulence or turbulence to form. In this way, the heat exchange between the exhaust air and the cooling medium increases. Due to the deformation of the tube wall caused by the embossing, the heat transfer surface also increases, which also leads to an increase in the heat exchange rate.
  • the at least one elevation runs linearly along the inside of the tube wall.
  • a line-like course of the elevation is achieved in that the tube is moved in relation to the stamp or the stamp with respect to the tube during the stamping process.
  • the elevation extends helically or helically on the inside of the tube wall.
  • the elevation has a spiral course.
  • the tube is rotated about its longitudinal axis during the stamping process and also longitudinally to it Longitudinal axis moves.
  • the slope of the helical course of the elevation and thus the number of turns is determined at a constant rotational speed of the tube by the speed at which the tube is moved longitudinally to its longitudinal axis. The lower the slope, the more turns the survey has.
  • the orientation of the elevation to the flow direction of the exhaust air is also determined by the slope. The orientation of the elevation and the number of turns have a direct influence on the degree of turbulence in the interior of the tube and thus on the heat exchange rate.
  • the elevation has a self-contained circular profile comparable to a ring.
  • This process can be repeated any number of times at different points on the pipe.
  • the tube has areas of reduced diameter, so-called constrictions, at fixed intervals.
  • this can also be achieved by using a plurality of coining dies arranged next to one another in one process step.
  • the elevation can be sharp-edged or curved, that is to say without sharp edges.
  • the heat exchanger according to the invention can comprise only one tube or a plurality of tubes, depending on the application. If a plurality of tubes are provided, these are preferably guided parallel to one another as a bundle at a distance from one another. A bundle of tubes proves to be advantageous compared to a single tube with a large diameter, since the ratio of heat-transferring area to volume is more favorable in the case of a tube bundle.
  • At least one embossing is merely introduced into the tube wall of the tube from the outside using at least one embossing stamp.
  • a smooth tube that is to say a tube with a smooth surface, is preferably used to produce the tube.
  • Smooth tubes are available inexpensively in different embodiments.
  • At least one line embossing is introduced into the tube wall.
  • a line is embossed by the Embossing process, either the pipe is moved in relation to the stamp or the stamp is moved in relation to the pipe.
  • the embossing process creates a helical course of the elevation along the inside of the pipe wall.
  • a roll is preferably used as an embossing stamp.
  • Figure 1 is a perspective view of an embodiment of a tube of a heat exchanger
  • FIG. 2 shows the use of a heat exchanger according to the invention in a system for exhaust gas recirculation in a highly simplified schematic representation.
  • the cylindrical tube 1 shown in FIG. 1 has three elongated, line-like depressions 3 with a triangular cross-section on the outside of its tube wall 2, which are each designed to be self-contained and enclose the tube wall 2 at certain distances from one another.
  • the inside of the tube wall 2 has sharp-edged elevations 4 corresponding to the recesses 3. These protrude into the interior of the tube 1, so that the cross section of the tube 1 narrows at these points.
  • FIG. 2 shows a heat exchanger according to the invention in a system for exhaust gas recirculation.
  • the heat exchanger comprises a tube 1 which is connected to an internal combustion engine 7 via an inlet 5 and an outlet 6.
  • the exhaust air from the internal combustion engine 7 flows through the tube 1.
  • a cooling medium flows around the outside of its tube wall 2. The heat transfer takes place via the tube wall 2, so that the cooling medium absorbs heat from the exhaust air and this consequently cools down.
  • the arrows show that the elevations 4, which protrude into the flow duct of the exhaust air, cause the flow of the exhaust air to break off at these points, which leads to turbulence and thus to improved heat transfer.

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

L'invention concerne un échangeur thermique pour refroidir des gaz d'échappement, qui comprend au moins un tuyau (1) présentant au moins une surélévation (4) sur la face intérieure de sa paroi tubulaire (2), ladite surélévation faisant saillie dans l'espace intérieur du tuyau (1). Cette surélévation (4) (au moins au nombre de une) résulte d'une opération de matriçage de la paroi tubulaire (2) depuis l'extérieur. L'invention concerne par ailleurs un procédé permettant de produire un tuyau (1) pour un échangeur thermique.
PCT/EP2000/011189 1999-11-20 2000-11-13 Echangeur thermique pour refroidir des gaz d'echappement et procede pour produire un tuyau pour un echangeur thermique WO2001038814A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU13939/01A AU1393901A (en) 1999-11-20 2000-11-13 Heat exchanger for cooling exhaust gases and a method for producing a pipe for aheat exchanger

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1999155939 DE19955939A1 (de) 1999-11-20 1999-11-20 Wärmetauscher zur Kühlung von Abgasen und ein Verfahren zur Herstellung eines Rohrs für einen Wärmetauscher
DE19955939.2 1999-11-20

Publications (1)

Publication Number Publication Date
WO2001038814A1 true WO2001038814A1 (fr) 2001-05-31

Family

ID=7929784

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2000/011189 WO2001038814A1 (fr) 1999-11-20 2000-11-13 Echangeur thermique pour refroidir des gaz d'echappement et procede pour produire un tuyau pour un echangeur thermique

Country Status (3)

Country Link
AU (1) AU1393901A (fr)
DE (1) DE19955939A1 (fr)
WO (1) WO2001038814A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10350765B4 (de) * 2003-10-30 2005-12-29 Eisenmann Maschinenbau Gmbh & Co. Kg Satz von thermischen Nachverbrennungsvorrichtungen
DE102005042314A1 (de) * 2005-09-06 2007-03-08 Behr Gmbh & Co. Kg Wärmetauscher
DE102007040013A1 (de) * 2007-08-24 2009-02-26 Bayerische Motoren Werke Aktiengesellschaft Werkzeug für das Warmumformen und/oder Presshärten eines Metallblechs
DE102008050153B4 (de) * 2008-10-01 2022-02-03 Rational Ag Gargerät mit Wärmetauscherleitung
DE102010008175B4 (de) * 2010-02-16 2014-12-04 Thesys Gmbh Wärmeübertrager
CN104209719A (zh) * 2014-08-20 2014-12-17 常熟市佳泰金属材料有限公司 一种热交换器用钛合金钢管的制备方法

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3606780A (en) * 1967-11-28 1971-09-21 Kichisaburo Nagahara Method for manufacturing helical pipe for heat exchangers
US3785189A (en) * 1971-05-10 1974-01-15 Felten & Guilleaume Kabelwerk Tube corrugating apparatus
US4007774A (en) * 1975-09-23 1977-02-15 Uop Inc. Heat exchange apparatus and method of controlling fouling therein
US4403385A (en) * 1980-10-24 1983-09-13 Amtrol Inc. Process of preparing a double wall heat exchanger
DE3317986A1 (de) 1983-05-18 1984-11-22 kabelmetal electro GmbH, 3000 Hannover Rohrfoermiger waermetauscher zur rueckgewinnung von waermeenergie aus abgasen
DE8915499U1 (de) * 1989-06-03 1990-08-09 Vießmann, Hans, Dr., 3559 Battenberg Heizkessel
US5425239A (en) 1993-04-01 1995-06-20 Ab Volvo Supercharged internal combustion engine with EGR
US5617726A (en) 1995-03-31 1997-04-08 Cummins Engine Company, Inc. Cooled exhaust gas recirculation system with load and ambient bypasses
DE19540683A1 (de) 1995-11-01 1997-05-07 Behr Gmbh & Co Wärmeüberträger zum Kühlen von Abgas
DE29709991U1 (de) * 1997-06-09 1997-08-14 Buderus Heiztechnik Gmbh, 35576 Wetzlar Heizfläche
US5709029A (en) * 1992-09-22 1998-01-20 Energy Saving Concepts Limited Manufacture of helically corrugated conduit
EP0926439A2 (fr) * 1997-12-23 1999-06-30 Renato Montini Chaudière à gaz
WO1999062654A1 (fr) * 1998-06-01 1999-12-09 Afatec S.R.L. Tube ondule bimetallique et procede de fabrication correspondant

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29708011U1 (de) * 1997-05-03 1998-08-27 Solvay Verwaltungs- und Vermittlungs GmbH, 30173 Hannover Abgasrückkühler

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3606780A (en) * 1967-11-28 1971-09-21 Kichisaburo Nagahara Method for manufacturing helical pipe for heat exchangers
US3785189A (en) * 1971-05-10 1974-01-15 Felten & Guilleaume Kabelwerk Tube corrugating apparatus
US4007774A (en) * 1975-09-23 1977-02-15 Uop Inc. Heat exchange apparatus and method of controlling fouling therein
US4403385A (en) * 1980-10-24 1983-09-13 Amtrol Inc. Process of preparing a double wall heat exchanger
DE3317986A1 (de) 1983-05-18 1984-11-22 kabelmetal electro GmbH, 3000 Hannover Rohrfoermiger waermetauscher zur rueckgewinnung von waermeenergie aus abgasen
DE8915499U1 (de) * 1989-06-03 1990-08-09 Vießmann, Hans, Dr., 3559 Battenberg Heizkessel
US5709029A (en) * 1992-09-22 1998-01-20 Energy Saving Concepts Limited Manufacture of helically corrugated conduit
US5425239A (en) 1993-04-01 1995-06-20 Ab Volvo Supercharged internal combustion engine with EGR
US5617726A (en) 1995-03-31 1997-04-08 Cummins Engine Company, Inc. Cooled exhaust gas recirculation system with load and ambient bypasses
DE19540683A1 (de) 1995-11-01 1997-05-07 Behr Gmbh & Co Wärmeüberträger zum Kühlen von Abgas
DE29709991U1 (de) * 1997-06-09 1997-08-14 Buderus Heiztechnik Gmbh, 35576 Wetzlar Heizfläche
EP0926439A2 (fr) * 1997-12-23 1999-06-30 Renato Montini Chaudière à gaz
WO1999062654A1 (fr) * 1998-06-01 1999-12-09 Afatec S.R.L. Tube ondule bimetallique et procede de fabrication correspondant

Also Published As

Publication number Publication date
AU1393901A (en) 2001-06-04
DE19955939A1 (de) 2001-05-23

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