EP4094031A1 - Method for the thin coating of inner surfaces of through-openings - Google Patents

Method for the thin coating of inner surfaces of through-openings

Info

Publication number
EP4094031A1
EP4094031A1 EP21705422.0A EP21705422A EP4094031A1 EP 4094031 A1 EP4094031 A1 EP 4094031A1 EP 21705422 A EP21705422 A EP 21705422A EP 4094031 A1 EP4094031 A1 EP 4094031A1
Authority
EP
European Patent Office
Prior art keywords
compressed air
coating
jet
nozzle
constriction
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.)
Pending
Application number
EP21705422.0A
Other languages
German (de)
French (fr)
Inventor
Jens-Werner Kipp
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP4094031A1 publication Critical patent/EP4094031A1/en
Pending legal-status Critical Current

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
    • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F28F13/18—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by applying coatings, e.g. radiation-absorbing, radiation-reflecting; by surface treatment, e.g. polishing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/22—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to internal surfaces, e.g. of tubes
    • 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
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/126—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element consisting of zig-zag shaped fins
    • 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
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/24—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely
    • F28F1/32—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely the means having portions engaging further tubular elements
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/04—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
    • B05D3/0406—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases the gas being air
    • B05D3/042—Directing or stopping the fluid to be coated with air
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/08—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/08—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface
    • B05D5/083—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface involving the use of fluoropolymers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2245/00—Coatings; Surface treatments
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2245/00—Coatings; Surface treatments
    • F28F2245/04—Coatings; Surface treatments hydrophobic

Definitions

  • the invention relates to a method for applying a thin coating to an inner surface of a through recess, in particular a through recess of a lamellar heat exchanger and / or a through hole.
  • the invention also relates to the use of the method for thin-coating internal surfaces of a lamellar heat exchanger and / or internal surfaces of through-bores
  • a thin coating of internal surfaces of lamellar heat exchangers with construction depths of typically up to 800mm is not possible. Coatings of lamellar heat exchangers, for example for the purpose of corrosion protection, are made during manufacture or when the lamellar heat exchanger is dismantled using an immersion process. Due to the process, however, the coating thickness is in a higher range. Due to the comparatively large coating thickness, the heat transfer can already be noticeably impaired. In addition, the thin coating of lamellar heat exchangers in the installed state with the known or commonly used coating agents has not been possible up to now.
  • the object of the invention is to provide a method with which the application of a thin coating can be applied to an internal surface of through bores and of lamellar heat exchangers.
  • the depth of the exchanger can be up to 800mm and more.
  • the method for applying a thin coating to an inner surface of a passage recess provides that a coating agent is introduced into a compressed air stream and thereby broken down into fine droplets and that the coating agent is then by means of a convergent-divergent jet nozzle with a constricted nozzle jet is applied to the surface to be coated at a high flow rate.
  • the output speed of the new method which is high in contrast to the usual spray methods, is at least 30 m / sec up to supersonic speed, depending on the structural depth of the deceiver or the through hole to be coated. This guarantees that the nozzle jet can also coat surfaces that are deeper.
  • the beam directed onto the surfaces runs parallel or largely parallel, that is, at an acute angle to the surface to be coated.
  • the friction of the jet on the surface nevertheless leads to the desired thin coating of the surfaces.
  • the high speed of the nozzle jet immediately removes excess material so that the coating can be applied thinly or produced.
  • the layer thickness of the surface can also be regulated.
  • the method according to the invention makes it possible to provide thin coatings with a thickness of 100 nm to 40 ⁇ m. Here it is possible to produce a specified nominal thickness with an accuracy of a maximum of 20%.
  • Another possibility of regulation is the dosage amount of the coating agent.
  • the thin coating also smooths the existing surfaces, thereby closing the pores of the surfaces. This leads to the improvement of the throughput values of compressed air or fluids.
  • the smoother surfaces are also easier to clean.
  • liquids or liquids with particles are used as coating agents.
  • hydrophobic coating agents in the area of uncovered lamellar heat exchangers outdoors, a self-cleaning effect is also achieved through rain.
  • Silazanes for example, are used as hydrophobic coating agents.
  • halogenated hydrocarbons such as PTFE or hybrids with an inorganic basic structure with organic side chains can serve as coating agents.
  • FIG. 2 shows a basic illustration of the method in the thin coating of internal surfaces of a lamellar heat exchanger.
  • the method according to the invention is illustrated using a first application example shown in FIG. 1.
  • the jet nozzle 4 which has a first connection for supplying compressed air 1 and a wide connection for supplying a coating agent 2.
  • the jet nozzle 4 is designed as a convergent-divergent jet nozzle with a constriction 5.
  • the jet nozzle 4 is used to atomize the blasting agent 2 and provides a jet 3 at the outlet at a speed of at least 30 m / sec.
  • the coating agent 2 is metered into the compressed air 1 at a distance 6 of 40 mm in front of the constriction 5 of the jet nozzle 4.
  • the compressed air 1 preferably has a dew point of at least 3 ° C.
  • a pressure of the metered in coating agent 2 is preferably greater than a pressure of the supplied compressed air 1.
  • the nozzle jet 3 is directed onto a jacket 8 of a roller which has a multiplicity of through recesses 9.
  • the passage recesses 9 provide internal surfaces 10 to which a thin coating with a thickness in the range from 100 nm to 40 ⁇ m is applied.
  • the inner surface 10 extends parallel to a jet direction 7 of the nozzle jet 3, which is directed onto the jacket 8 of the roller.
  • the nozzle jet 3 can be directed at an acute angle 11 onto the inner surfaces 10 of the through cutouts 9. The acute angle 11 should - in relation to the beam direction 7 - be smaller than 30 °.
  • Fig. 2 shows a second application example for the method according to the invention.
  • the inner surfaces 9 of a lamellar heat exchanger 12 are thinly coated, with adjacent lamellas 13 of the lamellar heat exchanger 12 forming the through cutouts 9.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Geometry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

The invention relates to a method for applying a thin coating to an inner surface (10) of a through-opening (9), in particular a through-opening (9) of a finned-tube heat exchanger (12), and/or a through-hole, wherein a coating agent (2) is introduced into a stream of compressed air (1), and thereby broken down into very fine droplets, and a nozzle jet (3) generated by a convergent-divergent jet nozzle with a constriction (5) is subsequently used to apply this coating agent at a high flow velocity to the surface (10) to be coated.

Description

Verfahren zur Dünnbeschichtung innenliegender Oberflächen von Durchgangsausnehmungen Process for thin coating of internal surfaces of through holes
Die Erfindung betrifft ein Verfahren zum Aufbringen einer Dünnbeschichtung auf eine innenliegende Oberfläche einer Durchgangsausnehmung, insbesondere einer Durchgangsausnehmung eines Lamellenwärmetauschers und/oder einer Durchgangsbohrung. Ferner betrifft die Erfindung die Verwendung des Verfahrens zum Dünnbeschichten von innenliegenden Oberflächen eines Lamellenwärmetauschers und oder von innenliegenden Oberflächen von Durchgangsbohrungen The invention relates to a method for applying a thin coating to an inner surface of a through recess, in particular a through recess of a lamellar heat exchanger and / or a through hole. The invention also relates to the use of the method for thin-coating internal surfaces of a lamellar heat exchanger and / or internal surfaces of through-bores
Mit Druckluft betriebene Lackierprozesse sind seit langem bekannt. Die Austrittsgeschwindigkeit eines Druckluftstrahls wird hier durch eine nur geringe Düsenöffnung und die Strahlführung begrenzt. Damit wird auch das sogenannte "overspray" begrenzt, das nicht genau die zu lackierende Oberfläche trifft. Der Strahlwinkel beträgt hier möglichst nahe 90°, das heißt der Druckluftstrahl trifft im Wesentlichen Senkrecht auf die zu lackierende Oberfläche. Painting processes operated with compressed air have been known for a long time. The exit speed of a compressed air jet is limited here by only a small nozzle opening and the jet guidance. This also limits the so-called "overspray" that does not exactly hit the surface to be painted. The jet angle here is as close as possible to 90 °, i.e. the compressed air jet hits the surface to be painted essentially perpendicularly.
Eine Dünnbeschichtung innenliegender Oberflächen von Lamellenwärmetauschern mit Bautiefen von typischerweise bis zu 800mm ist so nicht möglich. Beschichtungen von Lamellenwärmetauschern zum Beispiel zwecks Korrosionsschutzes werden während der Herstellung oder im ausgebauten Zustand des Lamellenwärmetauschers im Tauchverfahren hergestellt. Die Beschichtungsdicke liegt hier verfahrensbedingt jedoch in einem höheren Bereich. Aufgrund der vergleichsweise großen Beschichtungsdicke kann der Wärmeübergang bereits merklich beeinträchtigen sein. Zudem ist die Dünnbeschichtung von Lamellenwärmetauschern im eingebauten Zustand mit den bekannten beziehungsweise üblicherweise eingesetzten Beschichtungsmitteln bisher nicht möglich. A thin coating of internal surfaces of lamellar heat exchangers with construction depths of typically up to 800mm is not possible. Coatings of lamellar heat exchangers, for example for the purpose of corrosion protection, are made during manufacture or when the lamellar heat exchanger is dismantled using an immersion process. Due to the process, however, the coating thickness is in a higher range. Due to the comparatively large coating thickness, the heat transfer can already be noticeably impaired. In addition, the thin coating of lamellar heat exchangers in the installed state with the known or commonly used coating agents has not been possible up to now.
Ebenso ist die Dünnbeschichtung der Innenflächen von Durchgangsbohrungen mit kleinen Durchmessern wie z.B. 3mm, wie diese beispielsweise an Lochwalzen in der Papierindustrie in großer Stückzahl vorgesehen sind, ist mit den bisher vorhandenen Verfahren / den optimalen Beschichtungsmitteln schwierig bis unmöglich. Likewise, the thin coating of the inner surfaces of through-holes with small diameters such as 3mm, such as those provided in large numbers on perforated rollers in the paper industry, is difficult or even impossible with the processes available up to now / the optimal coating agents.
Aufgabe der Erfindung ist es, ein Verfahren anzugeben, mit dem die Aufbringung einer Dünnbeschichtung auf eine innenliegende Oberfläche von Durchgangsbohrungen und von Lamellenwärmetauschern aufgebracht werden kann. The object of the invention is to provide a method with which the application of a thin coating can be applied to an internal surface of through bores and of lamellar heat exchangers.
Die Bautiefe der Tauscher kann dabei bis zu 800mm und mehr betragen. The depth of the exchanger can be up to 800mm and more.
Erfindungsgemäß wird dieses Problem mit den Merkmalen des Patentanspruchs 1 gelöst. Demzufolge sieht das Verfahren zur Aufbringung einer Dünnbeschichtung auf eine innenliegende Oberfläche einer Durchgangsausnehmung, insbesondere einer Durchgangsausnehmung eines Lamellenwärmetauschers und/oder einer Durchgangsbohrung, vor, dass ein Beschichtungsmittel in einen Druckluftstrom eingegeben und dadurch in Feinsttröpfchen zerlegt wird und dass das Beschichtungsmittel anschließend mittels eines durch eine konvergent-divergente Strahldüse mit einer Engstellte erzeugten Düsenstrahls bei hoher Strömungsgeschwindigkeit auf die zu beschichtenden Oberfläche aufgetragen wird. According to the invention, this problem is solved with the features of claim 1. Accordingly, the method for applying a thin coating to an inner surface of a passage recess, in particular a passage recess of a lamellar heat exchanger and / or a through hole, provides that a coating agent is introduced into a compressed air stream and thereby broken down into fine droplets and that the coating agent is then by means of a convergent-divergent jet nozzle with a constricted nozzle jet is applied to the surface to be coated at a high flow rate.
Vorteilhafte Ausgestaltungen des erfindungsgemäßen Verfahrens sind in den nachfolgenden Unteransprüchen angegeben. Die im Unterschied zu den üblichen Sprayverfahren hohe Ausgangsgeschwindigkeit des neuen Verfahrens beträgt abhängig von der zu beschichtenden Bautiefe des Täuschers bzw. der Durchgangsbohrung zumindest 30m / sec bis zu Überschallgeschwindigkeit. Dadurch wird garantiert, dass der Düsenstrahl auch in größerer Bautiefe liegende Oberflächen beschichten kann. Advantageous refinements of the method according to the invention are given in the following subclaims. The output speed of the new method, which is high in contrast to the usual spray methods, is at least 30 m / sec up to supersonic speed, depending on the structural depth of the deceiver or the through hole to be coated. This guarantees that the nozzle jet can also coat surfaces that are deeper.
Der auf die Oberflächen gerichtete Strahl verläuft dabei parallel oder größtenteils parallel, das heißt unter einem spitzen Winkel zu der zu beschichtenden Oberfläche.The beam directed onto the surfaces runs parallel or largely parallel, that is, at an acute angle to the surface to be coated.
Die Reibung des Strahls an der Oberfläche führt dennoch zu der gewünschten Dünnbeschichtung der Oberflächen. Durch die hohe Geschwindigkeit des Düsenstrahls wird überschüssiges Material sofort wieder abgetragen, so dass die Beschichtung dünn aufgetragen beziehungsweise hergestellt werden kann. Je nach Einstellung des Strahldrucks und der damit verbundenen Strahlgeschwindigkeit kann so auch die Schichtdicke der Oberfläche reguliert werden. Insgesamt gelingt es mit dem erfindungsgemäßen Verfahren, Dünnbeschichtungen mit einer Dicke von 100 nm bis 40 pm bereitzustellen. Hierbei gelingt es, eine vorgegebene Solldicke mit einer Genauigkeit von maximal 20 % herzustellen. The friction of the jet on the surface nevertheless leads to the desired thin coating of the surfaces. The high speed of the nozzle jet immediately removes excess material so that the coating can be applied thinly or produced. Depending on the setting of the jet pressure and the associated jet speed, the layer thickness of the surface can also be regulated. Overall, the method according to the invention makes it possible to provide thin coatings with a thickness of 100 nm to 40 μm. Here it is possible to produce a specified nominal thickness with an accuracy of a maximum of 20%.
Eine weitere Regulierungsmöglichkeit besteht über die Dosierungsmenge des Beschichtungsmittels. Another possibility of regulation is the dosage amount of the coating agent.
Die Dünnbeschichtung bringt neben dem Korrosionsschutz eine Glättung der vorhandenen Oberflächen mit sich, Poren der Oberflächen werden dadurch geschlossen. Das führt zu der Verbesserung der Durchgangswerte von Druckluft oder Fluiden. Die glatteren Oberflächen lassen sich zudem besser reinigen. In addition to providing protection against corrosion, the thin coating also smooths the existing surfaces, thereby closing the pores of the surfaces. This leads to the improvement of the throughput values of compressed air or fluids. The smoother surfaces are also easier to clean.
Als Beschichtungsmittel kommen grundsätzlich Liquide beziehungsweise Liquide mit Partikeln zur Anwendung. Beim Einsatz von hydrophoben Beschichtungsmitteln wird im Bereich von nicht überdachten Lamellenwärmetauschern im Außenbereich zusätzlich ein Selbstreinigungseffekt durch Regen erreicht. Als hydrophobes Beschichtungsmittel kommen beispielsweise Silazane zur Anwendung. Beispielsweise können halogenierte Kohlenwasserstoffe wie zum Beispiel PTFE oder Hybride mit anorganischem Grundgerüst mit organischen Seitenketten als Beschichtungsmittel dienen. Die nachfolgenden Figuren und die Figurenbeschreibung verdeutlichen das erfindungsgemäße Verfahren anhand von Ausführungsbeispielen der Erfindung. In principle, liquids or liquids with particles are used as coating agents. When using hydrophobic coating agents in the area of uncovered lamellar heat exchangers outdoors, a self-cleaning effect is also achieved through rain. Silazanes, for example, are used as hydrophobic coating agents. For example, halogenated hydrocarbons such as PTFE or hybrids with an inorganic basic structure with organic side chains can serve as coating agents. The following figures and the description of the figures illustrate the method according to the invention on the basis of exemplary embodiments of the invention.
Es zeigen: Show it:
Fig. 1 eine Prinzipdarstellung des Verfahrens bei der Dünnbeschichtung von Durchgangsausnehmungen in einem Walzenmantel und 1 shows a basic representation of the method in the thin coating of through-holes in a roll shell and
Fig. 2 eine Prinzipdarstellung des Verfahrens bei der Dünnbeschichtung von innenliegenden Oberflächen eines Lamellenwärmetauschers. 2 shows a basic illustration of the method in the thin coating of internal surfaces of a lamellar heat exchanger.
Das erfindungsgemäße Verfahren wird exemplarisch anhand eines in Fig. 1 gezeigten ersten Anwendungsbeispiels verdeutlicht. The method according to the invention is illustrated using a first application example shown in FIG. 1.
In Fig. 1 ist eine Strahldüse 4 dargestellt, die einen ersten Anschluss zum Zuführen von Druckluft 1 und einen weiten Anschluss vom Zuführen eines Beschichtungsmittels 2 aufweist. Die Strahldüse 4 ist als konvergent-divergente Strahldüse mit einer Engstelle 5 ausgebildet. Die Strahldüse 4 dient zum Zerstäuben des Strahlmittels 2 und stellt am Ausgang eines Düsenstrahl 3 mit einer Geschwindigkeit von mindestens 30 m/sec bereit. Das Beschichtungsmittel 2 wird vorliegend in einem Abstand 6 von 40 mm vor der Engstelle 5 der Strahldüse 4 in die Druckluft 1 eindosiert. 1 shows a jet nozzle 4 which has a first connection for supplying compressed air 1 and a wide connection for supplying a coating agent 2. The jet nozzle 4 is designed as a convergent-divergent jet nozzle with a constriction 5. The jet nozzle 4 is used to atomize the blasting agent 2 and provides a jet 3 at the outlet at a speed of at least 30 m / sec. In the present case, the coating agent 2 is metered into the compressed air 1 at a distance 6 of 40 mm in front of the constriction 5 of the jet nozzle 4.
Die Druckluft 1 weist bevorzugt einen Taupunkt von mindestens 3 °C auf. Ein Druck des eindosierten Beschichtungsmittel 2 ist bevorzugt größer als ein Druck der zugeführten Druckluft 1. The compressed air 1 preferably has a dew point of at least 3 ° C. A pressure of the metered in coating agent 2 is preferably greater than a pressure of the supplied compressed air 1.
Der Düsenstrahl 3 wird auf eine Mantel 8 einer Walze gerichtet, der eine Vielzahl von Durchgangsausnehmungen 9 aufweist. Die Durchgangsausnehmungen 9 sehen innenliegende Oberflächen 10 vor, auf die eine Dünnbeschichtung mit einer Dicke im Bereich von 100 nm bis 40 pm aufgebracht ist. Die innenliegende Oberfläche 10 erstreckt sich parallel zu einer Strahlrichtung 7 des Düsenstrahls 3, der auf den Mantel 8 der Walze gerichtet ist. Optional kann der Düsenstrahl 3 unter einem spitzen Winkel 11 auf die innenliegenden Oberflächen 10 der Durchgangsausnehmungen 9 gerichtet werden. Der spitze Winkel 11 sollte - bezogen auf die Strahlrichtung 7 - kleiner sein als 30°. The nozzle jet 3 is directed onto a jacket 8 of a roller which has a multiplicity of through recesses 9. The passage recesses 9 provide internal surfaces 10 to which a thin coating with a thickness in the range from 100 nm to 40 μm is applied. The inner surface 10 extends parallel to a jet direction 7 of the nozzle jet 3, which is directed onto the jacket 8 of the roller. Optionally, the nozzle jet 3 can be directed at an acute angle 11 onto the inner surfaces 10 of the through cutouts 9. The acute angle 11 should - in relation to the beam direction 7 - be smaller than 30 °.
Fig. 2 zeigt ein zweites Anwendungsbeispiel für das erfindungsgemäße Verfahren. Fig. 2 shows a second application example for the method according to the invention.
Hierbei werden die innenliegenden Oberflächen 9 eines Lamellenwärmetauschers 12 dünnbeschichtet, wobei benachbarte Lamellen 13 des Lamellenwärmetauschers 12 die Durchgangsausnehmungen 9 bilden. Here, the inner surfaces 9 of a lamellar heat exchanger 12 are thinly coated, with adjacent lamellas 13 of the lamellar heat exchanger 12 forming the through cutouts 9.

Claims

Patentansprüche Claims
1. Verfahren zur Aufbringung einer Dünnbeschichtung auf eine innenliegende Oberfläche (10) einer Durchgangsausnehmung (9), insbesondere einer Durchgangsausnehmung (9) eines Lamellenwärmetauschers (12) und/oder einer Durchgangsbohrung, wobei ein Beschichtungsmittel (2) in einen Druckluftstrom (1) eingegeben und dadurch zerstäubt wird und anschließend mittels eines durch eine konvergent-divergente Strahldüse (4) mit einer Engstelle (5) erzeugten Düsenstrahls (3) bei hoher Strömungsgeschwindigkeit auf die zu beschichtenden Oberfläche (10) aufgetragen wird. 1. A method for applying a thin coating to an inner surface (10) of a through recess (9), in particular a through recess (9) of a lamellar heat exchanger (12) and / or a through hole, a coating agent (2) being introduced into a compressed air stream (1) and is thereby atomized and then applied to the surface (10) to be coated by means of a nozzle jet (3) generated by a convergent-divergent jet nozzle (4) with a constriction (5) at a high flow rate.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Austrittsgeschwindigkeit des Düsenstrahls (3) beim Verlassen der Strahldüse (4) mindestens 30 m/sec beträgt. 2. The method according to claim 1, characterized in that the exit speed of the nozzle jet (3) when leaving the jet nozzle (4) is at least 30 m / sec.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Beschichtungsmittel (3) bei einer Eindosierung mindestens 40 mm vor der Engstelle (4) der Strahldüse (4) mit zumindest 80 % eines Drucks der Druckluft (1) zugeführt wird, vorzugsweise jedoch mit einem Druck oberhalb des Drucks der Druckluft. 3. The method according to claim 1 or 2, characterized in that the coating agent (3) when metered at least 40 mm in front of the constriction (4) of the jet nozzle (4) is supplied with at least 80% of a pressure of the compressed air (1), preferably but with a pressure above the pressure of the compressed air.
4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass das Beschichtungsmittel (3) bei der Eindosierung in einer Entfernung von weniger als 40 mm von der Engstelle (5) der Strahldüse (4), in der Engstelle (5) oder stromaufwärts der Engstelle (5) der Strahldüse (4) mit einem Druck von weniger als 80 % des Drucks der Druckluft (1) und/oder drucklos zugeführt wird. 4. The method according to any one of claims 1 to 3, characterized in that the coating agent (3) during metering at a distance of less than 40 mm from the constriction (5) of the jet nozzle (4), in the constriction (5) or upstream of the constriction (5) of the jet nozzle (4) is supplied with a pressure of less than 80% of the pressure of the compressed air (1) and / or without pressure.
5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Dünnbeschichtung mit einer Dicke nach der Aushärtung von wenigstens 100 nm und maximal 40 pm hergestellt wird. 5. The method according to any one of claims 1 to 4, characterized in that the thin coating is produced with a thickness after curing of at least 100 nm and a maximum of 40 μm.
6. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass der Druckluft (1) ein hydrophobes Beschichtungsmittel (2) zugegeben wird. 6. The method according to any one of claims 1 to 5, characterized in that the compressed air (1) a hydrophobic coating agent (2) is added.
7. Verfahren nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass der Druckluft (1) ein Beschichtungsmittel (2) aus fluorierten Polymeren zugegeben wird. 7. The method according to any one of claims 1 to 6, characterized in that the compressed air (1) a coating agent (2) made of fluorinated polymers is added.
8. Verfahren nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass die Beschichtung aus organisch modifizierten keramischen Beschichtungsmitteln hergestellt wird. 8. The method according to any one of claims 1 to 7, characterized in that the coating is produced from organically modified ceramic coating agents.
9. Verfahren nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass die beschichteten Oberflächen (10) zur zusätzlichen Konditionierung der Dünnbeschichtung unmittelbar nach der Herstellung der Beschichtung zusätzlich mit dem Druckluftstrahl (1) bestrahlt werden. 9. The method according to any one of claims 1 to 8, characterized in that the coated surfaces (10) are additionally irradiated with the compressed air jet (1) for additional conditioning of the thin coating immediately after the production of the coating.
10. Verfahren nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass die eingesetzte Druckluft (1) einen Taupunkt von zumindest +3°C aufweist. 10. The method according to any one of claims 1 to 9, characterized in that the compressed air (1) used has a dew point of at least + 3 ° C.
11. Verfahren nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, dass die Engstelle (5) der Strahldüse (4) einen Querschnitt von mindestens acht Quadratmillimeter aufweist. 11. The method according to any one of claims 1 to 10, characterized in that the constriction (5) of the jet nozzle (4) has a cross section of at least eight square millimeters.
12. Verfahren nach einem der Ansprüche 1 bis 11, dadurch gekennzeichnet, dass die Strahldüse (4) eine Flachdüse ist. 12. The method according to any one of claims 1 to 11, characterized in that the jet nozzle (4) is a flat nozzle.
13. Verfahren nach einem der Ansprüche 1 bis 12, dadurch gekennzeichnet, dass der Druckluftstrom (1) durch ein Ventil geregelt wird. 13. The method according to any one of claims 1 to 12, characterized in that the compressed air flow (1) is regulated by a valve.
14. Verfahren nach einem der Ansprüche 1 bis 13, dadurch gekennzeichnet, dass das Beschichtungsmittel (2) durch eine Dosiereinheit und/oder ein Nadelventil und/oder eine Blende dosiert wird. 14. The method according to any one of claims 1 to 13, characterized in that the coating agent (2) is metered by a metering unit and / or a needle valve and / or a diaphragm.
15. Verwendung eines Verfahrens nach einem der Ansprüche 1 bis 14 zum Dünnbeschichten von innenliegenden Oberflächen (10) eines Lamellenwärmetauschers (12) und oder von innenliegenden Oberflächen (10) von Durchgangsbohrungen, die an einem Mantel (8) einer Walze und/oder Trommel vorgesehen sind. 15. Use of a method according to one of claims 1 to 14 for thin coating of internal surfaces (10) of a lamellar heat exchanger (12) and / or internal surfaces (10) of through bores which are provided on a jacket (8) of a roller and / or drum.
EP21705422.0A 2020-01-20 2021-01-11 Method for the thin coating of inner surfaces of through-openings Pending EP4094031A1 (en)

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DE102020101229 2020-01-20
DE102020127076.3A DE102020127076A1 (en) 2020-01-20 2020-10-14 Process for thin coating of internal surfaces of through holes
PCT/DE2021/100013 WO2021148078A1 (en) 2020-01-20 2021-01-11 Method for the thin coating of inner surfaces of through-openings

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