WO2008037755A1 - Appareil de dépôt de revêtements intérieurs dans des tubes, et procédé associé - Google Patents

Appareil de dépôt de revêtements intérieurs dans des tubes, et procédé associé Download PDF

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Publication number
WO2008037755A1
WO2008037755A1 PCT/EP2007/060239 EP2007060239W WO2008037755A1 WO 2008037755 A1 WO2008037755 A1 WO 2008037755A1 EP 2007060239 W EP2007060239 W EP 2007060239W WO 2008037755 A1 WO2008037755 A1 WO 2008037755A1
Authority
WO
WIPO (PCT)
Prior art keywords
pipes
deposition
gas
processing substance
guide
Prior art date
Application number
PCT/EP2007/060239
Other languages
English (en)
Inventor
Roberto Grassetti
Original Assignee
G.M.A. Srl
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 G.M.A. Srl filed Critical G.M.A. Srl
Publication of WO2008037755A1 publication Critical patent/WO2008037755A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
    • B05B13/06—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00 specially designed for treating the inside of hollow bodies
    • B05B13/0627—Arrangements of nozzles or spray heads specially adapted for treating the inside of hollow bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/26—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with means for mechanically breaking-up or deflecting the jet after discharge, e.g. with fixed deflectors; Breaking-up the discharged liquid or other fluent material by impinging jets
    • B05B1/262—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with means for mechanically breaking-up or deflecting the jet after discharge, e.g. with fixed deflectors; Breaking-up the discharged liquid or other fluent material by impinging jets with fixed deflectors
    • B05B1/265—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with means for mechanically breaking-up or deflecting the jet after discharge, e.g. with fixed deflectors; Breaking-up the discharged liquid or other fluent material by impinging jets with fixed deflectors the liquid or other fluent material being symmetrically deflected about the axis of the nozzle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/04—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge
    • B05B7/0416—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid
    • B05B7/0441—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid with one inner conduit of liquid surrounded by an external conduit of gas upstream the mixing chamber
    • B05B7/045—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid with one inner conduit of liquid surrounded by an external conduit of gas upstream the mixing chamber the gas and liquid flows being parallel just upstream the mixing chamber

Definitions

  • the present invention concerns an apparatus and a relative method for the internal coating of pipes, such as for example the tube bundles of heat exchangers for boilers, condensers for cooling units, or suchlike, which normally have an internal diameter not exceeding 2 inches.
  • the apparatus is able to achieve inside said pipes a coating layer comprising, for example epoxy resins, epoxy phenolic resins, phenolic resins, Teflon or suchlike, with an anti-corrosive or anti-rust function.
  • a known technique for painting the tube bundles provides to move the bundles to appropriate equipped plants where the painting is done, pouring paint directly into the tubes, or by immerging the tubes directly inside a bath of paint and subsequently dripping and drying the paint.
  • Another known painting technique provides to use a transportable painting apparatus.
  • the known painting apparatus is provided with a mobile probe which is inserted into the tubes, and paint is introduced at high pressure and without air, that is, in airless mode.
  • This known painting apparatus has the disadvantage, however, that it allows to paint only one tube at a time, entailing long operations to complete the painting of all the tubes and consequent long periods when the machine on which the tubes are mounted is out of use.
  • the painting pressure is relatively high, the paint sprayed inside the tubes tends to run and solidify in the lower part of the tubes.
  • the known painting apparatus therefore does not allow to obtain a homogeneous internal coating layer over the whole surface of the tube.
  • This known supplying hose can be fed out from and wound up on a drum of a winding up mechanism regularly and automatically, with the aid of a pinching roller mechanism which moves the supplying hose forwardly and backwardly by the rotating force of a pair of pinching rollers under some pressure for preventing the slackening of the same when it is moved in either direction.
  • this known apparatus is not able to mix the paint and the gas (i.e. air) before they exit from the spray nozzle.
  • One purpose of the present invention is to achieve an apparatus and perfect a relative method for the internal coating of pipes that allow to deposit in the latter a processing substance to define an internal coating layer which is homogeneous and which does not run, solidifying in the lower part of the pipes.
  • Another purpose of the present invention is to achieve an apparatus and perfect a method that allow to coat internally several pipes at the same time, in a rapid and reliable manner, obtaining a substantially homogeneous coating layer.
  • an apparatus according to the present invention is able to be employed for the internal coating of pipes in heat exchangers for boilers, condensers for cooling units or suchlike.
  • the apparatus according to the present invention comprises deposition means able to be inserted into the pipes in order to deposit therein at least a processing substance able to achieve an internal coating layer.
  • the processing substance comprises, for example epoxy resins, epoxy phenolic resins, phenolic resins, Teflon or suchlike, with an anti-corrosive or anti-rust function.
  • the apparatus according to the present invention also comprises first feeding means able to feed to the deposition means a gas, such as for example air, and second feeding means able to feed to the deposition means the processing susbstance.
  • first feeding means able to feed to the deposition means a gas, such as for example air
  • second feeding means able to feed to the deposition means the processing susbstance.
  • the deposition means comprises at least a probe having at least a mixing chamber provided in correspondence with a terminal portion thereof, in which mixing chamber the gas and the processing substance are able to be mixed together.
  • the gas and the processing substance are kept separate from each other substantially along the whole travel from the respective feeding means to the mixing chamber, in which only then are they mixed.
  • the present invention allows to obtain a correct and constant mixing substantially throughout the whole coating operation.
  • the present invention therefore allows to feed the gas and the processing substance at a relatively low pressure, respectively between about 2 bar and about 15 bar and between about 2 bar and about 12 bar, preferably between about 5 bar and about 8 bar and between about 5 bar and about 7 bar, guaranteeing good homogeneity in the deposition of the processing substance.
  • the deposition means comprises a plurality of probes and guide and movement means, able to guide and progressively move each of the probes in a corresponding pipe to be lined, allowing to line a plurality of pipes substantially simultaneously.
  • the apparatus according to the present invention allows to perform simultaneously an internal coating of several pipes in a rapid and reliable manner, obtaining a substantially homogeneous coating layer.
  • the present invention also concerns a method for the internal coating of said pipes, comprising a first step in which a deposition means is inserted into the pipes, and a second step in which by means of the deposition means at least a processing substance is deposed in the pipes in order to achieve an internal coating layer.
  • a gas is fed to the deposition means, and the gas and the processing substance are mixed together in correspondence with a terminal portion of the deposition means which is inserted into one of the pipes in the first step.
  • FIG. 1 is a front view of an apparatus according to the present invention.
  • - fig. 2 is a left side view of the apparatus in fig. 1;
  • - fig. 3 is a longitudinal section of a probe of the apparatus in fig. 1;
  • - fig. 4 is a block diagram of the apparatus in fig. 1. DETAILED DESCRIPTION OF A PREFERENTIAL FORM OF EMBODIMENT
  • an apparatus 10 is used for the internal coating of pipes 12 (fig. 3), such as for example the tube bundles of heat exchangers for boilers, or condensers for cooling units, by means of a processing substance.
  • the processing substance here and hereafter also called paint, comprises catalytic epoxy resins, phenolic based thermosetting resins, polytetrafluoroethylene (PTFE), for example comprising minerals, pigments, stabilizing substances, thixotropic substances and other additives, so as to guarantee maximum chemical resistance and heat stability.
  • PTFE polytetrafluoroethylene
  • the typical density of the processing substance before application with the apparatus 10 can vary from about 10 seconds to about 40 seconds with a Ford cup 4.
  • the apparatus 10 comprises (figs. 1 and 2) a frame 14 provided with wheels 16, a vertical support or column 18, a slider 20, able to slide in the vertical column 18, and a worm screw 22, inserted into the vertical column 18 and connected to a first motor 24 to move the slider 20 vertically.
  • the apparatus 10 also comprises, in the case shown here, a group of five pairs of movement rollers 26 connected to a second motor 28. Both the movement rollers 26 and the motor 28 are mounted on the slider 20. Moreover, the rollers 26 of each pair define a compartment into which a corresponding probe 30 is inserted.
  • Each probe 30 (fig. 3) comprises a first external tube 32, made of semirigid material, able to transport air, a second internal tube 34 able to transport a processing substance, a connection 36 and a terminal element 38.
  • connection 36 is provided with a central pipe 40, able to be connected to the second tube 34, and with peripheral pipes 42, able to communicate with the first tube 32.
  • the terminal element 38 comprises a body 44, able to be connected to the connection 36 and defining inside a mixing chamber 46, in which the central pipe 40 and the peripheral pipes 42 terminate.
  • the terminal element 38 also comprises a nozzle 48 connected to the mixing chamber 46 and shaped so as to allow the radial spraying of the air/paint mixture.
  • the body 44 inside the mixing chamber 46, the body 44 comprises a hollow cone spiral, able to guide the mixture towards the nozzle 48 to be sprayed with a spraying angle of less than 90° with respect to the longitudinal axis of the probe and 30.
  • the nozzle 48 is shaped so as to allow spraying at 360° on a plane substantially orthogonal to the longitudinal axis of the probe 30, thus allowing to coat the whole surface of the pipe 12.
  • the terminal element 38 allows to mix air and paint directly at the end of the probe, that is, in proximity with the point where the spray is delivered, thus guaranteeing the correct mixture of air and paint.
  • the apparatus 10 also comprises a reel 50 (figs. 1 and 2), on which the probes 30 are wound, and which is connected to a third motor 52 (fig. 2), an air/paint collector, or rotary distributor, 54 which is disposed on the longitudinal axis of the reel 50, an air distributor 56 and a paint distributor 58, both mounted on the reel 50.
  • a reel 50 (figs. 1 and 2), on which the probes 30 are wound, and which is connected to a third motor 52 (fig. 2), an air/paint collector, or rotary distributor, 54 which is disposed on the longitudinal axis of the reel 50, an air distributor 56 and a paint distributor 58, both mounted on the reel 50.
  • the third motor 52 is replaced by a spring mechanism provided with an appropriate disc brake, which is able to automatically rewind the probes 30 on the reel 50.
  • the distributors 56 and 58 are connected upstream with the air/paint collector 54, and downstream respectively with the first 32 and the second tube 34 of each probe 30.
  • the apparatus 10 also comprises, shown schematically in fig. 4, an air compressor 60, an air circuit 62 and a paint circuit 64, both circuits 52, 64 connected to the compressor 60.
  • the air circuit 62 comprises a first air filter 66, able to de-humidify and de-oil a delivery unit and a service unit.
  • the delivery unit comprises, connected to each other, downstream of the first air filter 66, a device to regulate the air pressure 68 and an air valve 70, connected downstream to the motors 28 which feed and retract the rollers 26 and to the motor 52 of the reel 50.
  • the air valve 70 is connected through the air/paint collector 54 to the air distributor 56.
  • the service unit comprises, connected downstream of the first air filter 66, a service air valve 72, connected to the motor 24 that moves the worm screw 22.
  • the paint circuit 64 comprises a second air filter 74, able to de-humidify and de-oil, connected to a paint pump 76 able to pick up paint from a tank, not shown here.
  • the paint pump 76 is for example of the low-pressure tyP e ' preferably less than about 10 bar, for example of the double membrane type.
  • the paint circuit 64 comprises, connected to each other and downstream of the paint pump 76, a filter 78, a paint pressure regulator 80 and a paint valve 82.
  • the paint valve 82 is connected by means of the air/paint collector 54 to the paint distributor 58.
  • the apparatus 10 also comprises a command and control unit 84, provided with a push-button panel installed on the vertical column (fig. 1) and able to command and control said valves 70, 72 and 82 both pneumatically and electrically.
  • a command and control unit 84 provided with a push-button panel installed on the vertical column (fig. 1) and able to command and control said valves 70, 72 and 82 both pneumatically and electrically.
  • the probes 30 are removed from the reel 50 through the respective pairs of rollers 26 and inserted into the pipes 12 so as to make the relative terminal elements 38 advance into the pipes 12.
  • the pressure of the rollers 26 on the probes 30 is regulated by means of a shock absorber 86 (fig. 1) disposed on the upper part of the coupling of the rollers 26.
  • the speed of inlet and outlet is regulated by the command and control unit 84 by means of the motor 28 of the rollers 26.
  • the reel 50 rotates idly with a mechanical clutch so as to keep the probes 30 slightly under tension.
  • the probes 30 are inserted into the pipes 12 until they reach the opposite end, exiting by some centimeters .
  • a second step the reel 50 is drawn by the motor 52 and the probes 3 are retracted, accompanied by the rollers 26 which work in the inverse direction with respect to the first step.
  • the apparatus 10 is displaced in a horizontal direction by means of the wheels 16.
  • the probes 30 are displaced in a vertical direction by the movement of the slider 20.
  • the command and control unit 84 activates the air compressor 60, regulating the air pressure and the paint pressure thereof according to the layer of paint to be deposited.
  • the command and control unit 84 defines the speed of return of the probes 30, for example comprised between about 0.2 m/sec and about 0.5 m/sec, acting on the motor 52 of the reel 50 (or automatically by means of the spring mechanism cited above) and on the motor 28 of the rollers 26, and commands the air valves and paint valves 70 and 82 respectively to open.
  • the relatively low speed of movement of the probes 30 guarantees good homogeneity of the coating and prevents any dripping.
  • the speed of return is defined according to the material to be deposited.
  • a coating layer is thus deposited inside the pipes 12 which functions as a protection against corrosion and rust.
  • the probes 30 are pulled by the rollers 26, rotated by the motor 28, and rewind on the reel 50 by means of the motor 52, or automatically by the spring mechanism cited above.
  • the probes 30 can again be inserted into the already coated pipes 12, so as to repeat the second step and hence deposit another layer of coating.
  • the apparatus 10 allows to command and control several probes 30 simultaneously, the invention allows to considerably reduce the times required for coating the pipes 12, while still guaranteeing a homogeneous coating. It is clear that modifications and/or additions of parts may be made to the apparatus 10 as described heretofore, without departing from the scope of the present invention.

Landscapes

  • Pens And Brushes (AREA)
  • Macromolecular Compounds Obtained By Forming Nitrogen-Containing Linkages In General (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

L'invention porte sur un appareil (10) de dépôt de revêtements intérieurs dans des tubes (12) d'échangeurs thermiques de chaudières, de condensateurs d'unités de refroidissement, etc. comprenant des éléments de dépôt (30) s'insérant dans les tubes (12) pour y déposer au moins une substance de traitement capable de réaliser le revêtement intérieur. L'appareil (10) comprend également une première unité d'alimentation fournissant un gaz aux éléments de dépôt (30), une seconde unité d'alimentation fournissant la substance de traitement aux éléments de dépôt (30), et en outre des éléments mélangeurs (38) capable de mélanger ensemble le gaz et la substance de traitement, et disposés en correspondance avec la partie terminale des éléments de dépôt (30) insérée dans l'un des tubes (12).
PCT/EP2007/060239 2006-09-27 2007-09-26 Appareil de dépôt de revêtements intérieurs dans des tubes, et procédé associé WO2008037755A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITUD20060217 ITUD20060217A1 (it) 2006-09-27 2006-09-27 Apparecchiatura per il rivestimento interno di condutture, e relativo procedimento
ITUD2006A000217 2006-09-27

Publications (1)

Publication Number Publication Date
WO2008037755A1 true WO2008037755A1 (fr) 2008-04-03

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PCT/EP2007/060239 WO2008037755A1 (fr) 2006-09-27 2007-09-26 Appareil de dépôt de revêtements intérieurs dans des tubes, et procédé associé

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IT (1) ITUD20060217A1 (fr)
WO (1) WO2008037755A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102470386A (zh) * 2009-08-11 2012-05-23 积水医疗株式会社 涂敷装置及液态物的涂敷方法
CN104368482A (zh) * 2014-11-11 2015-02-25 深圳格普斯电热技术有限公司 电热膜的内壁喷涂装置及其喷涂方法
DE102016204341A1 (de) * 2016-03-16 2017-09-21 Bayerische Motoren Werke Aktiengesellschaft Sprühstation für Schweißtrennmittel und Verfahren zum automatisierten Besprühen
WO2022152765A1 (fr) * 2021-01-12 2022-07-21 Säkaphen Gmbh Installation de projection d'un agent de revêtement sur des parois intérieures de tubes et appareil de projection pour cette installation

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2520397A (en) * 1946-12-05 1950-08-29 Marion C Green Spraying apparatus for internally coating pipes
US4368219A (en) 1980-06-13 1983-01-11 Sumitomo Light Metal Industries Ltd. Method and apparatus for coating the inner surface of long tubes of small diameter
EP0658375A1 (fr) * 1993-12-16 1995-06-21 Degussa Aktiengesellschaft Procédé et dispositif pour l'imprégnation déterminée de structures en nul d'abeilles ayant des canaux d'écoulement parallèles
EP0747318A1 (fr) * 1995-06-08 1996-12-11 Metallgesellschaft Aktiengesellschaft Procédé et dispositif pour le refroidissement d'un mélange gazeux contenant de l'hydrogène et du soufre élémentaire
US5879456A (en) * 1996-07-17 1999-03-09 Curran; Ed Tube coating system
US6117242A (en) * 1995-11-28 2000-09-12 Kreiselmaier; Richard Device for internal coating of pipes
RU2252376C2 (ru) * 2001-06-01 2005-05-20 Андрей Маркович Войтко Вихревой испарительный конденсатор

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2520397A (en) * 1946-12-05 1950-08-29 Marion C Green Spraying apparatus for internally coating pipes
US4368219A (en) 1980-06-13 1983-01-11 Sumitomo Light Metal Industries Ltd. Method and apparatus for coating the inner surface of long tubes of small diameter
EP0658375A1 (fr) * 1993-12-16 1995-06-21 Degussa Aktiengesellschaft Procédé et dispositif pour l'imprégnation déterminée de structures en nul d'abeilles ayant des canaux d'écoulement parallèles
EP0747318A1 (fr) * 1995-06-08 1996-12-11 Metallgesellschaft Aktiengesellschaft Procédé et dispositif pour le refroidissement d'un mélange gazeux contenant de l'hydrogène et du soufre élémentaire
US6117242A (en) * 1995-11-28 2000-09-12 Kreiselmaier; Richard Device for internal coating of pipes
US5879456A (en) * 1996-07-17 1999-03-09 Curran; Ed Tube coating system
RU2252376C2 (ru) * 2001-06-01 2005-05-20 Андрей Маркович Войтко Вихревой испарительный конденсатор

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102470386A (zh) * 2009-08-11 2012-05-23 积水医疗株式会社 涂敷装置及液态物的涂敷方法
EP2465614A1 (fr) * 2009-08-11 2012-06-20 Sekisui Medical Co., Ltd. Dispositif d'application et procédé d'application de liquide
EP2465614A4 (fr) * 2009-08-11 2013-02-13 Sekisui Medical Co Ltd Dispositif d'application et procédé d'application de liquide
US8893643B2 (en) 2009-08-11 2014-11-25 Sekisui Medical Co., Ltd. Coating apparatus and liquid substance coating method
JP5863026B2 (ja) * 2009-08-11 2016-02-16 積水メディカル株式会社 塗布装置及び液状物の塗布方法
CN106111411A (zh) * 2009-08-11 2016-11-16 积水医疗株式会社 涂敷装置及液态物的涂敷方法
CN108580124A (zh) * 2009-08-11 2018-09-28 积水医疗株式会社 涂敷装置及液态物的涂敷方法
CN104368482A (zh) * 2014-11-11 2015-02-25 深圳格普斯电热技术有限公司 电热膜的内壁喷涂装置及其喷涂方法
CN104368482B (zh) * 2014-11-11 2016-06-29 深圳格普斯电热技术有限公司 电热膜的内壁喷涂装置及其喷涂方法
DE102016204341A1 (de) * 2016-03-16 2017-09-21 Bayerische Motoren Werke Aktiengesellschaft Sprühstation für Schweißtrennmittel und Verfahren zum automatisierten Besprühen
WO2022152765A1 (fr) * 2021-01-12 2022-07-21 Säkaphen Gmbh Installation de projection d'un agent de revêtement sur des parois intérieures de tubes et appareil de projection pour cette installation

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