EP4105366A1 - Procédé de revêtement d'un échangeur de chaleur - Google Patents

Procédé de revêtement d'un échangeur de chaleur Download PDF

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Publication number
EP4105366A1
EP4105366A1 EP22177094.4A EP22177094A EP4105366A1 EP 4105366 A1 EP4105366 A1 EP 4105366A1 EP 22177094 A EP22177094 A EP 22177094A EP 4105366 A1 EP4105366 A1 EP 4105366A1
Authority
EP
European Patent Office
Prior art keywords
heat exchanger
bundle
electrically connected
potential
bodies
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Withdrawn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
EP22177094.4A
Other languages
German (de)
English (en)
Inventor
Boris Kerler
Tobias Urban
Daniela RADIG
Michael Schön
Alec YAO
Peilian ZHAO
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.)
Mahle International GmbH
Original Assignee
Mahle International GmbH
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 Mahle International GmbH filed Critical Mahle International GmbH
Publication of EP4105366A1 publication Critical patent/EP4105366A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D13/00—Electrophoretic coating characterised by the process
    • C25D13/22—Servicing or operating apparatus or multistep processes
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D13/00—Electrophoretic coating characterised by the process
    • C25D13/12—Electrophoretic coating characterised by the process characterised by the article coated
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D13/00—Electrophoretic coating characterised by the process
    • C25D13/12—Electrophoretic coating characterised by the process characterised by the article coated
    • C25D13/14—Tubes; Rings; Hollow bodies
    • 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
    • F28D1/053—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 straight
    • F28D1/0535—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 straight the conduits having a non-circular cross-section
    • F28D1/05366—Assemblies of conduits connected to common headers, e.g. core type radiators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
    • F28F19/02—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings

Definitions

  • the present invention relates to a method for coating a heat exchanger by means of electrophoretic deposition, the heat exchanger having tubular bodies and corrugated fins.
  • the invention also relates to a heat exchanger coated in this way.
  • Heat exchangers are used to transfer heat between two fluids.
  • the two fluids flow through the heat exchanger, fluidically separated from one another. Heat transfer between the fluids takes place within the heat exchanger.
  • one of the flow paths usually leads through tube bodies of the heat exchanger which are spaced apart from one another.
  • the tubular bodies are also arranged at a distance from one another in the flow path of the other fluid. The other flow path thus leads between the tubular bodies.
  • heat transfer-increasing structures are usually provided in the cavities formed between the tubular bodies, which are also referred to below as corrugated fins. Such corrugated fins are in heat-transferring contact with at least one of the tubular bodies.
  • the tubular bodies and the corrugated fins are generally electrically conductive. This is due in particular to the fact that increased heat transfer is achieved by manufacturing the tube bodies and/or corrugated fins from metals or metal alloys.
  • the heat exchanger in particular the tube body, and/or the corrugated fins can be damaged due to operational reasons and/or due to general conditions and/or due to aging. At least one of the fluids flowing through the heat exchanger can also lead to damage to the heat exchanger, in particular corrosion of the heat exchanger.
  • the heat exchanger in particular the tube body and the corrugated fins, with a protective layer.
  • a simple method for coating the heat exchanger that is advantageous in series production is electrophoretic deposition.
  • corners of the assembled heat exchanger are usually electrically connected to an electrode of an associated system, ie to a corresponding electrical potential.
  • the system also has a counter-electrode, so that particles flowing between the electrodes are deposited on surfaces of the heat exchanger during operation.
  • cathodic dip painting is known, in which the heat exchanger is immersed in a bath as a cathode.
  • the surfaces of the heat exchanger are not coated, or not sufficiently coated, at least locally.
  • there is an increased risk of said damage during operation of the heat exchanger in particular corrosion of the uncoated or insufficiently coated surfaces.
  • These can lead to a reduction in the service life of the heat exchanger.
  • Leaks can also occur, in particular due to corrosion, which can lead to a failure of the heat exchanger.
  • the present invention is therefore concerned with the task of specifying improved or at least different embodiments for a method for coating a heat exchanger of the type mentioned at the beginning and for such a heat exchanger, which are characterized in particular by an improved coating and/or an increased service life of the heat exchanger.
  • the complex structure of the heat exchanger leads to a change, in particular a disruption, of the electric field lines, in particular of the electric potential, on the heat exchanger during the separation.
  • the present invention is based on the general idea of coating a heat exchanger by means of electrophoretic deposition, with additional electrical contacting options being created within the heat exchanger, which are connected to a corresponding electrical potential in an associated system for coating the heat exchanger.
  • the knowledge is used that the complex structure of the heat exchanger leads to a change, in particular a disruption, of the electric field lines, in particular of the electric potential, on the heat exchanger during the separation.
  • a more uniform, in particular more homogeneous, distribution of electric field lines and/or a reduced drop in the electric potential in the heat exchanger is achieved.
  • the surfaces of the Heat exchanger completely and homogeneously coated during the deposition process or at least reduces the risk of locally reduced or absent deposits.
  • this results in an improved resistance of the heat exchanger, in particular to corrosion. This leads to an increased service life of the heat exchanger and to avoiding or at least reducing leakages that occur during operation.
  • the heat exchanger has tubular bodies that are spaced apart from one another, as well as structures that increase heat transfer and are arranged between the tubular bodies. These structures are advantageously designed as corrugated ribs and are therefore generally referred to below as corrugated ribs.
  • the tubular bodies and the corrugated ribs form a package or network through which fluid can flow, this package or network also being referred to below as a bundle.
  • the heat exchanger thus includes a bundle of the tube bodies and the corrugated fins. The bundle extends between two opposite end faces.
  • the bundle extends in a vertical direction, a transverse direction running transversely to the vertical direction and a longitudinal direction running transverse to the vertical direction and transverse to the transverse direction, with the bundle having two opposite end faces in the vertical direction, in the transverse direction and in the longitudinal direction.
  • the bundle is coated in a system using electrophoretic deposition.
  • the bundle in the system is electrically connected to an electrode of the system, ie to a corresponding electrical potential.
  • the bundle is connected as the electrode at deposition.
  • at least one electrically conductive body is provided in the bundle, which body extends from one of the end faces in the direction of the opposite end face.
  • the body is of the tubular bodies and the corrugated fins different and electrically connected to at least one of the tubular bodies and/or the corrugated fins. In this case, the at least one body is electrically connected to the electrical potential.
  • the tubular bodies expediently delimit a flow path of a first fluid, which flows through the heat exchanger during operation.
  • the arrangement of the tubular bodies at a distance from one another also delimits a flow path for a second fluid, which flows through the tubular body in a fluidically separated manner from the first fluid.
  • the corrugated fins are therefore arranged in the second flow path and the second fluid can flow through them.
  • At least one of the at least one body is expediently arranged outside of the tubular body and thus in the second flow path.
  • the body extends through the bundle differently than the corrugated ribs.
  • tubular bodies and the corrugated fins are expediently electrically conductive.
  • the tubular bodies and the corrugated fins are made of a metal or a metal alloy, for example sheet metal.
  • the electrophoretic deposition preferably takes place in such a way that the coating is a protective coating for the tube body and the corrugated fins, in particular against corrosion.
  • the entire heat exchanger ie not just the bundle including at least one body, is preferably electrically connected to the potential and serves as a corresponding electrode during the deposition.
  • the entire heat exchanger is advantageously coated by means of electrophoretic deposition.
  • Embodiments are preferred in which the electrophoretic deposition is implemented as cathodic dip painting, the potential being set in such a way that the bundle, in particular the heat exchanger, is connected as a cathode. This leads to a simplified coating of the heat exchanger that is particularly suitable for series production.
  • the bundle in particular the heat exchanger, can in principle have any shape.
  • the bundle in particular the heat exchanger, is advantageously of cuboid design. This simplifies both the production and the use of the heat exchanger.
  • At least one of the at least one body has an electrical connection on at least one of the end faces between which it extends.
  • the body is electrically connected to the potential via this electrical connection.
  • the electrical connection is advantageously a thread.
  • the method for coating the heat exchanger can thus be implemented in a simplified manner, with a stable and reliable electrical connection of the body to the potential being provided at the same time.
  • the bundle is provided with two or more such bodies.
  • the bodies are expediently spaced apart from one another.
  • the bodies can be electrically connected to the potential in a simplified manner in this way.
  • the respective body can have any shape.
  • At least one of the bodies particularly preferably the respective body, extends in an elongate manner.
  • the body can thus be electrically connected to the tubular bodies and/or corrugated fins over a greater distance. This results in an improved coating of the heat exchanger.
  • Embodiments are preferred in which at least one of the at least one body, advantageously the respective body, is designed or provided as a profile. In addition to an advantageous electrical connection over a long distance, this leads to a reduced weight of the heat exchanger.
  • At least one of the at least one body can only be provided for the electrophoretic deposition on the bundle and then removed.
  • At least one of the at least one body can be an integral part of the bundle. This leads to a simplified coating and/or simplified manufacture of the heat exchanger.
  • At least one of the at least one body extends from one of the end faces to the opposite end face, that is to say essentially over the entire extent of the bundle between the end faces. In this way, improved electrical contact of the body with the implemented at least one tubular body and/or the at least one corrugated fin. This results in an improved coating of the heat exchanger.
  • the bundle advantageously the heat exchanger, is expediently also electrically connected to the potential at points which are at a distance from the bodies and separate from the bodies.
  • the heat exchanger thus has edges connecting the end faces to one another, with at least one of the edges being electrically connected to the potential in addition to the at least one body.
  • embodiments are considered to be advantageous in which at least one electrical connection separate from the at least one body takes place via at least one corner of the heat exchanger.
  • the respective edge thus extends from one corner of the heat exchanger to another corner, with at least one of the corners being electrically connected to the potential in addition to the at least one body.
  • the coating can thus be implemented in a simplified manner. In addition, this results in advantageous electrical field lines within the heat exchanger and thus an improved coating.
  • Embodiments are preferred in which the system has a frame which serves as an electrode of the system.
  • the bundle in particular the heat exchanger, is electrically connected to the frame for coating. This results in a simplified and at the same time reliable coating of the heat exchanger.
  • the frame In order to coat the heat exchanger, the frame can be moved through the system, in particular it can be immersed in a bath and pulled out of the bath.
  • Embodiments are preferred in which the heat exchanger is electrically connected to the frame with electrically conductive wires running between the heat exchanger, in particular the bundle, and the frame, the wires advantageously also keeping the heat exchanger floating in the frame.
  • the heat exchanger with the wires is arranged in a floating manner in the frame.
  • the frame is expediently electrically conductive and electrically connected to the electrical potential, so it also serves as an electrode, so that the wires electrically connect the heat exchanger, in particular the bundle, to the potential.
  • At least one of the at least one body is connected to an electrical conductor which is separate from the wires and which can also be in the form of a wire, the conductor also being electrically connected to the frame.
  • the body is electrically connected to the potential via the conductor.
  • the heat exchanger advantageously has at least one such body.
  • the heat exchanger can be used in any application in which heat transfer between two fluids is intended.
  • the heat exchanger in a circuit through which a coolant or refrigerant circulates during operation, with the coolant or refrigerant flowing through the heat exchanger via one of the flow paths and in the heat exchanger with another fluid, which flows through the other flow path flows through the heat exchanger, is tempered, ie cooled and/or heated.
  • the heat exchanger in a motor vehicle.
  • a heat exchanger 1 as for example in the Figures 1 to 4 is shown, has a plurality of tubular bodies 2 spaced apart from one another, as well as structures 3 which are arranged between the tubular bodies 2 and increase the heat-transferring surface, which structures are also referred to below as corrugated fins 3 .
  • the tubular body 2 and the corrugated fins 3 are only in this case figure 1 shown.
  • the tubular body 2 and the corrugated fins 3 are part of a bundle 4 of the heat exchanger 1, which forms a network of the heat exchanger 1 through which a flow can flow.
  • the tubular body 2 and the corrugated fins 3 are electrically conductive, for example made of a metal or a metal alloy, in particular sheet metal.
  • a first flow path 5 for a first fluid leads through the tubular body 2 .
  • a second flow path 6 for a second fluid is delimited between the tubular bodies 2 spaced apart from one another and is fluidically separated from the first flow path 5 .
  • the corrugated fins 3 are arranged between the tubular bodies 2 and thus in the second flow path 6 and the second fluid flows through them during operation.
  • the tubular body 2 parallel and are spaced from each other.
  • the corrugated fins 3 are also arranged in parallel purely by way of example.
  • the tubular body 2 and the corrugated fins 3 are each configured identically, purely by way of example.
  • the heat exchanger 1 can have other components in addition to the bundle 4 .
  • the heat exchanger 1 includes, in addition to the bundle 4, two boxes 7 for distributing the through the tubular body 2 flowing fluid in the tubular body or collecting the fluid from the tubular bodies 2 on.
  • the heat exchanger 1 and thus the bundle 4 extend in three mutually transverse directions 8, 9, 10, which are referred to below as the vertical direction 8, the transverse direction 9 and the longitudinal direction 10.
  • the heat exchanger 1 and thus the bundle 4 have two opposite end faces 11 along the respective direction 8 , 9 , 10 .
  • the tubular bodies 2 extend in the longitudinal direction 10, purely by way of example.
  • the heat exchanger 1 of the illustrated embodiments is cuboid
  • the heat exchanger 1 in the figures 2 and 4 is shown in a greatly simplified manner with its outline as a cuboid.
  • adjacent end faces 11 are connected to each other via edges 12, the respective edge running between two associated corners 13.
  • bundle 4 has at least one electrically conductive body 14 that is different from tubular bodies 2 and corrugated fins 3 and extends from one of end faces 11 in the direction of opposite end face 11 .
  • the respective body 14 is electrically connected to at least one tubular body 2 and/or at least one corrugated fin 3.
  • the body 14 bears against at least one corrugated rib 3 and/or at least one tubular body 2 .
  • three such bodies 14 are provided purely by way of example, which are spaced apart from one another and run parallel, and which are of identical design purely by way of example.
  • the bodies 14 extend purely by way of example in the transverse direction 9 and further from one of the end faces 11 lying opposite in the transverse direction 9 to the opposite end face 11.
  • the bodies 14 thus extend into the
  • the respective body 14 is thus electrically connected to at least one tubular body 12 and/or at least one corrugated fin 3 over its entire extent running between the end faces 11.
  • the body 14 preferably extends elongate, ie between the associated end faces 11 elongate.
  • at least one of the bodies 14, preferably the respective body 14, is a profile 15.
  • FIG 2 a view can be seen in which only the outlines of the heat exchanger 1 can be seen, with the bodies 14 being shown inside the heat exchanger 1 .
  • figure 3 shows an isometric section through the heat exchanger 1 in the area of the body 14.
  • the body 14 of the embodiments shown are centered in the bundle 4 and spaced apart, arranged equidistantly in the embodiments shown.
  • the tubular bodies are arranged centrally in the bundle 4 in the vertical direction 8, extend in the transverse direction 9 over the entire extent of the bundle 4 and are arranged in the longitudinal direction 10, preferably equidistant from one another.
  • the heat exchanger 1 is coated by means of electrophoretic deposition. in the in figure 4 shown embodiment, this is done by cathodic dip painting.
  • the heat exchanger 1 is connected to an electrode 17 functioning as a cathode 16 of a system 18 for coating the heat exchanger 1 .
  • the system 18 also has an anode (not shown) as a counter-electrode.
  • the bodies 14 are each electrically connected to the cathode 16 .
  • the heat exchanger 1 is also electrically connected to the cathode 16 via points spaced apart from the bodies 14 .
  • the heat exchanger 1 is thus connected overall to a corresponding electrical potential of the cathode 16 and thus functions as a cathode 16 during cathodic dip painting.
  • the embodiment shown is the electrical connection of the heat exchanger 1 to the cathode 16, which is additional to the bodies 14, via the edges 12, the electrical connection being realized at the corners 13 of the heat exchanger 1 in the embodiment shown.
  • the exemplary embodiment shown is connected to the respective corner 13 via a wire 19 with the cathode 16 .
  • the bodies 14 are electrically connected on at least one of the associated end faces 11, in the exemplary embodiment shown on one of the end faces 11, via an associated electrical conductor 20, which is different from the wires 19 and can also be a wire the cathode 16 connected.
  • the embodiment shown has the system 18 on a frame 21 which is connected as an electrode 17, ie as a cathode 16 in the embodiment shown.
  • the heat exchanger 1 is arranged hanging or floating in the frame 21 via the wires 19 .
  • the respective body 14 in the exemplary embodiments shown has an electrical connection 22 , for example a thread 23 , on at least one of the end faces 11 .
  • the electrical conductor 20 is connected to the electrical connection 22 .
  • the body 14 is therefore in particular a profile 15 with a front connection 22, in particular a thread 23.
  • the method according to the invention and the heat exchanger 1 according to the invention thus result in a uniform and reliable coating of the heat exchanger 1.
  • damage, in particular corrosion, of the heat exchanger 1 caused by a lack of coating is avoided or at least reduced.
  • the service life of the heat exchanger 1 and the durability of the heat exchanger 1 are thus improved.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
EP22177094.4A 2021-06-16 2022-06-02 Procédé de revêtement d'un échangeur de chaleur Withdrawn EP4105366A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102021206141.9A DE102021206141A1 (de) 2021-06-16 2021-06-16 Verfahren zum Beschichten eines Wärmeübertragers

Publications (1)

Publication Number Publication Date
EP4105366A1 true EP4105366A1 (fr) 2022-12-21

Family

ID=81877753

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22177094.4A Withdrawn EP4105366A1 (fr) 2021-06-16 2022-06-02 Procédé de revêtement d'un échangeur de chaleur

Country Status (3)

Country Link
EP (1) EP4105366A1 (fr)
CN (1) CN115478312A (fr)
DE (1) DE102021206141A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003138399A (ja) * 2001-10-31 2003-05-14 Sanyo Electric Co Ltd 熱交換器の塗装装置
JP2005121257A (ja) * 2003-10-14 2005-05-12 Toyo Radiator Co Ltd 熱交換器内部の樹脂層形成方法
US20080156647A1 (en) * 2006-12-28 2008-07-03 Hamilton Sunstrand Corporation Method for electrodepositing a coating on an interior surface

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20081168A1 (it) 2008-06-26 2009-12-27 Fondital Spa Elemento di radiatore da riscaldamento a protezione totale anti-corrosione, e metodo di trattamento anti-corrosione di elementi di radiatori da riscaldamento
JP2011163649A (ja) 2010-02-09 2011-08-25 Espec Corp 熱交換器、環境試験装置及び熱交換器の製造方法
JP2012136737A (ja) 2010-12-27 2012-07-19 Asahi Kogyosha Co Ltd 温調用熱交換器
US9417018B2 (en) 2012-03-15 2016-08-16 Carrier Corporation Multi-layer protective coating for an aluminum heat exchanger
DE102017220390A1 (de) 2017-11-15 2019-05-16 Mahle International Gmbh Wärmeübertrager und zugehöriges Herstellungsverfahren
DE102017221083A1 (de) 2017-11-24 2019-05-29 Mahle International Gmbh Wärmetauscher für ein Kraftfahrzeug
EP3489610A1 (fr) 2017-11-27 2019-05-29 Mahle International GmbH Échangeur de chaleur

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003138399A (ja) * 2001-10-31 2003-05-14 Sanyo Electric Co Ltd 熱交換器の塗装装置
JP2005121257A (ja) * 2003-10-14 2005-05-12 Toyo Radiator Co Ltd 熱交換器内部の樹脂層形成方法
US20080156647A1 (en) * 2006-12-28 2008-07-03 Hamilton Sunstrand Corporation Method for electrodepositing a coating on an interior surface

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Publication number Publication date
CN115478312A (zh) 2022-12-16
DE102021206141A1 (de) 2022-12-22

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