EP3401019A1 - Device for the humidification of compressed gas - Google Patents

Device for the humidification of compressed gas Download PDF

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Publication number
EP3401019A1
EP3401019A1 EP18155834.7A EP18155834A EP3401019A1 EP 3401019 A1 EP3401019 A1 EP 3401019A1 EP 18155834 A EP18155834 A EP 18155834A EP 3401019 A1 EP3401019 A1 EP 3401019A1
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EP
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Prior art keywords
water
air
compressed air
container
water bath
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Granted
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EP18155834.7A
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German (de)
French (fr)
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EP3401019B1 (en
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Herbert Hauptkorn
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    • 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
    • B05B7/24—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 with means, e.g. a container, for supplying liquid or other fluent material to a discharge device
    • B05B7/2402—Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising containers fixed to the discharge device
    • B05B7/2405—Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising containers fixed to the discharge device using an atomising fluid as carrying fluid for feeding, e.g. by suction or pressure, a carried liquid from the container to the nozzle
    • B05B7/2416—Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising containers fixed to the discharge device using an atomising fluid as carrying fluid for feeding, e.g. by suction or pressure, a carried liquid from the container to the nozzle characterised by the means for producing or supplying the atomising fluid, e.g. air hoses, air pumps, gas containers, compressors, fans, ventilators, their drives
    • 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
    • B05B7/24—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 with means, e.g. a container, for supplying liquid or other fluent material to a discharge device
    • B05B7/2489—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 with means, e.g. a container, for supplying liquid or other fluent material to a discharge device an atomising fluid, e.g. a gas, being supplied to the discharge device
    • B05B7/2491—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 with means, e.g. a container, for supplying liquid or other fluent material to a discharge device an atomising fluid, e.g. a gas, being supplied to the discharge device characterised by the means for producing or supplying the atomising fluid, e.g. air hoses, air pumps, gas containers, compressors, fans, ventilators, their drives

Definitions

  • the invention relates to a device for humidifying compressed air, in particular for an application device for water-based paint.
  • Devices for air treatment in particular from the field of paint systems for water-based paints, are known from the state of the art, which are designed to create suitable ambient atmospheric conditions for the painting process. For this purpose, for example, is known to set a predetermined relative humidity in a room or a cabin in which the paint shop is.
  • the water-based paint is typically applied by means of an application device.
  • Such application devices can be designed, for example, as a rotary atomizer or spray gun.
  • a device for humidifying compressed air in particular for a compressed air-assisted application device for water-based paint comprises a partially filled with water, pressure-resistant container with an air inlet and an air outlet for compressed air.
  • the air inlet is arranged below the water level of the water bath contained in the pressure-resistant container and the air outlet above the water level of the water bath contained in the pressure-resistant container.
  • the invention is based on the observation that when spraying water-based paint under high pressure a lot of moisture is released into the ambient air and thus overspray. This loss of moisture on the one hand leads to the fact that the crosslinking and film closure of the water paint on the component to be painted is no longer satisfactorily, on the other hand increased material consumption is caused, in particular a frequent cleaning of the ambient air of Lackier Scheme filtering filter systems and thus increased production costs ,
  • the pressurized air supplied application device for atomizing the water paint supplied compressed air is usually very dry, since the moisture originally contained in the air is removed by compression and refrigeration. It has been shown that this dry compressed air further draws water from the water paint. In the context of the invention is therefore proposed to operate the application device with humidified compressed air.
  • Air-assisted application devices for water-based paint are in particular those devices which are suitable for atomizing the water-based paint under the influence of compressed air.
  • Compressed air-assisted application devices can be operated in particular by compressed air and include, for example, rotary atomizers, disc atomizers, bell atomizers and / or one or more atomizer nozzles.
  • the moistening of the intended for atomization of the water paint compressed air is carried out by introducing the dry compressed air, which is provided for example in a conventional manner by a compressor, via the air inlet below the water level in the partially filled with water container. Since the air outlet is above the water level, the supplied compressed air flow must flow through the water bath and absorbs moisture. The drying out of water-based paint components, which come indirectly or directly into contact with the compressed air flow during the painting process, is thus at least counteracted.
  • humidified compressed air when using the application device, a better atomization of the water-based paint can be achieved. This is particularly advantageous when painting wooden parts, as the water-based paint can penetrate better into pores. Job differences due to different surfaces to be painted, as they are present for example in wooden windows, ideally occur at best reduced. In general, the painting result is improved both qualitatively and visually. In addition, mist (overspray) can be attached by moistening, as moist air falls to the ground. The humidified compressed air at least partially compensates for water loss, thus ensuring better crosslinking of the water-based paint.
  • the water bath contained in the pressure-resistant container can preferably be heated by means of a heating device.
  • the temperature of the supplied compressed air can thus be adapted and in particular increased when flowing through the water bath. Air at elevated temperature has i. A. have a greater capacity to absorb water vapor or moisture.
  • Air at elevated temperature has i. A. have a greater capacity to absorb water vapor or moisture.
  • it is advantageous to moisten the compressed-air flow since this can reduce the proportion of the spray that escapes into the environment (overspray).
  • the water-based paint cools during sputtering due to the Adiabatic evaporative cooling, so that the surface of the painted component has a relation to the ambient air significantly reduced temperature.
  • the temperature and humidity of the ambient air is typically specified in paint systems by supply air systems. In the painting area, in particular within a paint booth, controlled atmospheric environmental conditions are created that favor the painting process.
  • the ambient air is typically in the range of room temperature and has an increased moisture content.
  • the large temperature difference between the component and the ambient air caused by evaporative cooling has a negative effect on the quality of the lacquer coating, in particular this leads to water and / or air inclusions or to a reduced adhesion of the applied lacquer. By heating the compressed air flow supplied to the application device, these effects can be counteracted.
  • the temperature of the water bath contained in the pressure-resistant container is preferably measurable by means of a temperature sensor.
  • the temperature sensor and the heating device are in operative connection with a control device such that the temperature of the water bath can be controlled.
  • the temperature of the water bath is in particular controllable such that it always remains within a presettable tolerance range.
  • control of the moisture content and / or the temperature of the compressed air takes place in that a control unit adjusts a throttle regulator arranged on the air inlet and / or the heating device accordingly in accordance with an actual setpoint adjustment.
  • the air outlet is preferably followed by a Tropfenabscheide nie. This ensures that condensing water can be separated from the pressure-tight container leaving the compressed air flow.
  • the air outlet downstream of an air heating unit is preferably modeled after the droplet separation unit and serves, on the one hand, to supply the application device with a compressed air flow having a predeterminable temperature.
  • the subsequent further heated compressed air flow can absorb a larger amount of moisture, so that the application device is provided a largely freed of condensate compressed air flow.
  • the dry compressed air which can be supplied via a connection, can be made available to an application device via a connecting piece, bypassing the water bath contained in the container.
  • a connecting piece bypassing the water bath contained in the container.
  • the invention further relates to a painting device for water-based paint, which comprises the device described above and the air-assisted application device for water-based paint.
  • the application device is connected to the device for compressed air-assisted atomization of the water-based paint.
  • FIG. 1 shows a device 1 for humidifying compressed air with a pressure-resistant container 2, which contains a water bath.
  • the level can be detected by means of water level sensors 3, 4.
  • the temperature of the water bath can be measured by means of a temperature sensor 5.
  • Water can be introduced via a water inlet 6 into the container 2.
  • the water inlet is check-protected via a valve 7, which is designed in particular as a solenoid valve.
  • a heating device 8 is further arranged, which is adapted to heat the water bath within the container 2 to a predeterminable temperature.
  • An air inlet 9 for compressed air is arranged at the bottom of the pressure-tight container 2, so that injected compressed air rises through the water bath and thereby absorbs moisture.
  • An air outlet 10, via which the humidified compressed air leaves the container 2, is arranged on the ceiling of the container 2.
  • the droplet separation unit 11 is further downstream of a distributor piece 12, which is connected via a connecting piece 13 with another distributor piece 15.
  • the further distributor piece 15 has a connection 16 for supplying dry compressed air.
  • the flow cross section of the connecting piece 13 can be changed via a fitting 14.
  • the fitting 14 is executed in possible embodiments as a shut-off valve or as a ball valve, so that a flow through the connector 13 can be completely interrupted.
  • a compressor for supplying dry compressed air can be connected to the connection 16.
  • the pipe connection between the further distributor piece 15 and the air inlet 9 can be shut off via a further fitting 17, in particular designed as a stopcock.
  • a throttle controller 18 Via a throttle controller 18, the size of the air inlet 9 supplied compressed air flow is further variable.
  • the distributor 14 is further fluidly connected to a further connection 19 for a compressed air-assisted application device 100.
  • an air heating unit 20 is arranged, which is designed to heat the flowing compressed air flow to a predetermined temperature.
  • the application device 100 During operation of the application device 100, it is supplied with humidified compressed air. Dry compressed air is fed via the port 16 in the device 1. For this purpose, the valve 14 is to close in the connector 13 and the other valve 15 to open. The supplied via the terminal 16 dry compressed air flows through the contained in the pressure-resistant container 2 water bath before it is delivered to the application device 100. As it flows through the water bath, the compressed air absorbs moisture. The water bath is optionally heated by means of the heating device 8, so that the compressed air is also heated when flowing through the water bath. The throughput in the container 2 or the volume flow is preferably less than 1m 3 per second.
  • the compressed air for the intended application of the aqueous paint application device 100 is preferably processed according to the ambient conditions and therefore also has in the example mentioned case a temperature of about 22 ° C and a relative humidity of about 80%.
  • the temperature of the supplied compressed air is predetermined via the temperature of the water bath and via the air heating unit 20.
  • the air heating unit 20 is in particular intended to counteract the condensation of water droplets which may occur upon cooling of the moisture-saturated compressed air stream.
  • the fitting 14 is opened in the connecting piece 13 and the other valve 15 is closed.
  • the fluid connection to the application device 100 in particular a hose arranged between the connection 19 and the application device 100, is rinsed with dry compressed air, which is supplied via the connection 16, so that no moist air remains in this region. This ensures in particular that no condensation forms in this area, which could adversely affect the painting result when carrying out a further painting process.

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  • Nozzles (AREA)
  • Details Or Accessories Of Spraying Plant Or Apparatus (AREA)

Abstract

Eine Vorrichtung (1) zur Befeuchtung von Druckluft insbesondere für eine druckluftunterstützte Applikationseinrichtung (100) für Wasserlack umfasst ein teilweise mit Wasser gefülltes, druckfestes Behältnis (2) mit einem Lufteinlass (9) und einem Luftauslass (10) für Druckluft. Der Lufteinlass (9) ist unterhalb eines Wasserspiegels eines im Behältnis (2) enthaltenen Wasserbads und der Luftauslass (10) oberhalb des Wasserspiegels des im Behältnis (2) enthaltenen Wasserbads angeordnet.

Figure imgaf001
A device (1) for humidifying compressed air, in particular for a compressed air-assisted application device (100) for water-based paint comprises a partially filled with water, pressure-resistant container (2) with an air inlet (9) and an air outlet (10) for compressed air. The air inlet (9) is arranged below a water level of a water bath contained in the container (2) and the air outlet (10) above the water level of the water bath contained in the container (2).
Figure imgaf001

Description

Die Erfindung betrifft eine Vorrichtung zur Befeuchtung von Druckluft insbesondere für eine Applikationseinrichtung für Wasserlack.The invention relates to a device for humidifying compressed air, in particular for an application device for water-based paint.

Aus dem Stand der Technik sind Vorrichtungen zur Luftaufbereitung insbesondere aus dem Bereich der Lackieranlagen für Wasserlacke bekannt, die dazu ausgebildet sind, für den Lackiervorgang geeignete atmosphärische Umgebungsbedingungen zu schaffen. Hierzu ist beispielsweise bekannt, eine vorgegebene relative Luftfeuchtigkeit in einem Raum oder einer Kabine, in der sich die Lackieranlage befindet, einzustellen. Der Wasserlack wird typischerweise mittels einer Applikationseinrichtung aufgetragen. Derartige Applikationseinrichtungen können beispielsweise als Rotationszerstäuber oder Sprühpistole ausgebildet sein.Devices for air treatment, in particular from the field of paint systems for water-based paints, are known from the state of the art, which are designed to create suitable ambient atmospheric conditions for the painting process. For this purpose, for example, is known to set a predetermined relative humidity in a room or a cabin in which the paint shop is. The water-based paint is typically applied by means of an application device. Such application devices can be designed, for example, as a rotary atomizer or spray gun.

Trotz dieser Bestrebungen entsteht insbesondere im Bereich der Nasslackierung beim Zerstäuben und Applizieren des Wasserlacks ein erheblicher Anteil von in die Umgebung entweichender Sprühnebel (Overspray).Despite these efforts, especially in the field of wet painting, when spraying and applying the water-based paint, a considerable proportion of spray mist escaping into the environment (overspray) arises.

Es ist Aufgabe der vorliegenden Erfindung, Mittel anzugeben, die dazu geeignet sind, den Lackiervorgang bei Lackieranlagen für Wasserlack zu verbessern.It is an object of the present invention to provide means which are suitable for improving the painting process in paint plants for water-based paint.

Diese Aufgabe wird gelöst durch eine Vorrichtung zur Befeuchtung von Druckluft mit den weiteren Merkmalen der Patentanspruchs 1.This object is achieved by a device for humidifying compressed air with the further features of patent claim 1.

Vorteilhafte Ausgestaltungen der Erfindung sind Gegenstand der Unteransprüche.Advantageous embodiments of the invention are the subject of the dependent claims.

Eine Vorrichtung zur Befeuchtung von Druckluft insbesondere für eine druckluftunterstützte Applikationseinrichtung für Wasserlack umfasst ein teilweise mit Wasser gefülltes, druckfestes Behältnis mit einem Lufteinlass und einem Luftauslass für Druckluft. Der Lufteinlass ist unterhalb des Wasserspiegels des im druckfesten Behältnis enthaltenen Wasserbads und der Luftauslass oberhalb des Wasserspiegels des im druckfesten Behältnis enthaltenen Wasserbads angeordnet.A device for humidifying compressed air in particular for a compressed air-assisted application device for water-based paint comprises a partially filled with water, pressure-resistant container with an air inlet and an air outlet for compressed air. The air inlet is arranged below the water level of the water bath contained in the pressure-resistant container and the air outlet above the water level of the water bath contained in the pressure-resistant container.

Der Erfindung liegt die Beobachtung zu Grunde, dass beim Zerstäuben von Wasserlack unter hohem Druck sehr viel Feuchtigkeit an die Umgebungsluft abgegeben wird und somit Overspray entsteht. Dieser Verlust von Feuchtigkeit führt zum einen dazu, dass die Vernetzung und Filmschließung des Wasserlacks auf dem zu lackierenden Bauteil nicht mehr zufriedenstellend erfolgt, zum anderen wird erhöhter Materialverbrauch verursacht, der insbesondere ein häufiges Reinigen der die Umgebungsluft des Lackierbereichs filternden Filteranlagen und somit erhöhte Produktionskosten bedingt.The invention is based on the observation that when spraying water-based paint under high pressure a lot of moisture is released into the ambient air and thus overspray. This loss of moisture on the one hand leads to the fact that the crosslinking and film closure of the water paint on the component to be painted is no longer satisfactorily, on the other hand increased material consumption is caused, in particular a frequent cleaning of the ambient air of Lackierbereich filtering filter systems and thus increased production costs ,

Die der druckluftunterstützten Applikationseinrichtung zur Zerstäubung des Wasserlacks zugeführte Druckluft ist üblicherweise sehr trocken, da die ursprünglich in der Luft enthaltene Feuchtigkeit durch Kompression und Kältetechnik herausgenommen wird. Es hat sich gezeigt, dass diese trockene Druckluft dem Wasserlack weiter Wasser entzieht. Im Rahmen der Erfindung wird daher vorgeschlagen, die Applikationseinrichtung mit befeuchteter Druckluft zu betreiben.The pressurized air supplied application device for atomizing the water paint supplied compressed air is usually very dry, since the moisture originally contained in the air is removed by compression and refrigeration. It has been shown that this dry compressed air further draws water from the water paint. In the context of the invention is therefore proposed to operate the application device with humidified compressed air.

Druckluftunterstützte Applikationseinrichtungen für Wasserlack sind insbesondere solche Einrichtungen, die dazu geeignet sind, den Wasserlack unter dem Einfluss von Druckluft zu Zerstäuben. Druckluftunterstützte Applikationseinrichtungen können insbesondere durch Druckluft betrieben sein und umfassen beispielsweise Rotationszerstäuber, Scheibenzerstäuber, Glockenzerstäuber und/oder ein oder mehrere Zerstäuberdüsen.Air-assisted application devices for water-based paint are in particular those devices which are suitable for atomizing the water-based paint under the influence of compressed air. Compressed air-assisted application devices can be operated in particular by compressed air and include, for example, rotary atomizers, disc atomizers, bell atomizers and / or one or more atomizer nozzles.

Die Befeuchtung der zur Zerstäubung des Wasserlacks vorgesehene Druckluft erfolgt durch Einleiten der trockenen Druckluft, die beispielsweise in an sich bekannter Weise von einem Kompressor bereitgestellt wird, über den Lufteinlass unterhalb des Wasserspiegels in das zum Teil mit Wasser gefüllte Behältnis. Da sich der Luftauslass oberhalb des Wasserspiegels befindet, muss der zugeführte Druckluftstrom das Wasserbad durchströmen und nimmt dabei Feuchtigkeit auf. Dem Austrocken von Wasserlackkomponenten, welche beim Lackiervorgang indirekt oder direkt in Kontakt mit dem Druckluftstrom kommen, wird somit zumindest entgegengewirkt.The moistening of the intended for atomization of the water paint compressed air is carried out by introducing the dry compressed air, which is provided for example in a conventional manner by a compressor, via the air inlet below the water level in the partially filled with water container. Since the air outlet is above the water level, the supplied compressed air flow must flow through the water bath and absorbs moisture. The drying out of water-based paint components, which come indirectly or directly into contact with the compressed air flow during the painting process, is thus at least counteracted.

Durch die Verwendung von befeuchteter Druckluft beim Einsatz der Applikationseinrichtung kann eine bessere Zerstäubung des Wasserlacks erreicht werden. Dies ist insbesondere beim Lackieren von Holzteilen von Vorteil, da der Wasserlack besser in Poren eindringen kann. Auftragsunterschiede aufgrund von unterschiedlichen zu lackierenden Oberflächen, wie sie beispielsweise bei Holzfenstern vorhanden sind, treten idealerweise allenfalls vermindert auf. Im Allgemeinen ist das Lackierergebnis sowohl qualitativ als auch optisch verbessert. Zusätzlich kann Sprühnebel (Overspray) durch Befeuchtung gebunden werden, da feuchte Luft zu Boden fällt. Durch die befeuchtete Druckluft wird ein Wasserverlust zumindest teilweise kompensiert, so dass eine bessere Vernetzung des Wasserlacks sichergestellt wird.By using humidified compressed air when using the application device, a better atomization of the water-based paint can be achieved. This is particularly advantageous when painting wooden parts, as the water-based paint can penetrate better into pores. Job differences due to different surfaces to be painted, as they are present for example in wooden windows, ideally occur at best reduced. In general, the painting result is improved both qualitatively and visually. In addition, mist (overspray) can be attached by moistening, as moist air falls to the ground. The humidified compressed air at least partially compensates for water loss, thus ensuring better crosslinking of the water-based paint.

Das im druckfesten Behältnis enthaltene Wasserbad ist vorzugsweise mittels einer Heizeinrichtung aufheizbar. Die Temperatur der zugeführten Druckluft kann somit bereits beim Durchströmen des Wasserbads angepasst und insbesondere erhöht werden. Luft mit erhöhter Temperatur weist i. A. eine größere Kapazität auf, Wasserdampf bzw. Feuchtigkeit aufzunehmen. Insbesondere beim druckluftunterstützen Betrieb von Applikationseinrichtungen für Wasserlacke ist es von Vorteil, den Druckluftstrom zu befeuchten, da dadurch der Anteil des in die Umgebung entweichenden Sprühnebels (Overspray) reduziert werden kann. Zudem kühlt sich der Wasserlack beim Zerstäuben aufgrund der adiabatischen Verdunstungskühlung ab, so dass die Oberfläche des lackierten Bauteils eine gegenüber der Umgebungsluft deutlich erniedrigte Temperatur aufweist. Die Temperatur und Feuchtigkeit der Umgebungsluft wird bei Lackieranlagen typischerweise durch Zuluftanlagen vorgegeben. Im Lackierbereich, insbesondere innerhalb einer Lackierkabine, werden kontrolliert atmosphärische Umgebungsbedingung geschaffen, die den Lackiervorgang begünstigen. Die Umgebungsluft liegt typischerweise im Bereich der Raumtemperatur und weist einen erhöhten Feuchtigkeitsgehalt auf. Der große, durch Verdunstungskälte verursachte Temperaturunterschied zwischen dem Bauteil und der Umgebungsluft wirkt sich negativ auf die Qualität der Lackbeschichtung auf, insbesondere führt dies zu Wasser und/oder Lufteinschlüssen oder zu einer verminderten Haftung des aufgebrachten Lacks. Durch Aufheizen des der Applikationseinrichtung zugeführten Druckluftstroms kann diesen Effekten entgegenwirkt werden.The water bath contained in the pressure-resistant container can preferably be heated by means of a heating device. The temperature of the supplied compressed air can thus be adapted and in particular increased when flowing through the water bath. Air at elevated temperature has i. A. have a greater capacity to absorb water vapor or moisture. In particular, in the compressed-air-assisted operation of application equipment for water-based paints, it is advantageous to moisten the compressed-air flow, since this can reduce the proportion of the spray that escapes into the environment (overspray). In addition, the water-based paint cools during sputtering due to the Adiabatic evaporative cooling, so that the surface of the painted component has a relation to the ambient air significantly reduced temperature. The temperature and humidity of the ambient air is typically specified in paint systems by supply air systems. In the painting area, in particular within a paint booth, controlled atmospheric environmental conditions are created that favor the painting process. The ambient air is typically in the range of room temperature and has an increased moisture content. The large temperature difference between the component and the ambient air caused by evaporative cooling has a negative effect on the quality of the lacquer coating, in particular this leads to water and / or air inclusions or to a reduced adhesion of the applied lacquer. By heating the compressed air flow supplied to the application device, these effects can be counteracted.

Die Temperatur des im druckfesten Behältnis enthaltenen Wassersbads ist vorzugsweise mittels eines Temperaturfühlers messbar. Der Temperaturfühler und die Heizeinrichtung stehen in einem möglichen Ausführungsbeispiel derart mit einer Steuereinrichtung in einer Wirkverbindung, dass die Temperatur des Wasserbads steuerbar ist. Die Temperatur des Wasserbads ist insbesondere derart steuerbar, dass diese stets innerhalb einer vorgebaren Toleranzspanne verbleibt.The temperature of the water bath contained in the pressure-resistant container is preferably measurable by means of a temperature sensor. In one possible embodiment, the temperature sensor and the heating device are in operative connection with a control device such that the temperature of the water bath can be controlled. The temperature of the water bath is in particular controllable such that it always remains within a presettable tolerance range.

In einem möglichen Ausführungsbeispiel erfolgt eine Steuerung des Feuchtigkeitsgehalts und/oder der Temperatur der Druckluft dadurch, dass eine Steuereinheit ein am Lufteinlass angeordneten Drosselregler und/oder die Heizeinrichtung nach Maßgabe eines Ist-Sollwertabgleichs entsprechend verstellt.In one possible embodiment, control of the moisture content and / or the temperature of the compressed air takes place in that a control unit adjusts a throttle regulator arranged on the air inlet and / or the heating device accordingly in accordance with an actual setpoint adjustment.

Dem Luftauslass ist vorzugsweise eine Tropfenabscheideeinheit nachgeschaltet. Dadurch wird erreicht, dass kondensierendes Wasser aus dem das druckfeste Behältnis verlassenden Druckluftstrom abgeschieden werden kann.The air outlet is preferably followed by a Tropfenabscheideeinheit. This ensures that condensing water can be separated from the pressure-tight container leaving the compressed air flow.

Vorzugsweise ist dem Luftauslass eine Luftheizungseinheit nachgeschaltet. Die Luftheizungseinheit ist vorzugsweise der Tropfenabscheideeinheit nachgestaltet und dient zum einen dazu, dass die Applikationseinrichtung mit einem Druckluftstrom versorgt wird, der eine vorgebbare Temperatur aufweist. Zum anderen kann der nachträgliche weiter aufgeheizte Druckluftstrom eine größere Menge Feuchtigkeit aufnehmen, so dass der Applikationseinrichtung ein weitestgehend von Kondenswasser befreiter Druckluftstrom bereitgestellt wird.Preferably, the air outlet downstream of an air heating unit. The air heating unit is preferably modeled after the droplet separation unit and serves, on the one hand, to supply the application device with a compressed air flow having a predeterminable temperature. On the other hand, the subsequent further heated compressed air flow can absorb a larger amount of moisture, so that the application device is provided a largely freed of condensate compressed air flow.

Vorzugsweise ist die über einen Anschluss zuführbare, trockene Druckluft über ein Verbindungsstück unter Umgehung des im Behältnis enthaltenen Wasserbads an eine Applikationseinrichtung bereitstellbar. Dadurch wird erreicht, dass die Leitungen, welche während des Lackiervorgangs befeuchtete Druckluft, insbesondere mit Feuchtigkeit gesättigte Druckluft führen, anschließend mit trockener Druckluft gespült werden können. In den Leitungen sammelt sich dann kein oder nur vernachlässigbar wenig Kondenswasser an, welches sich negativ bei einer Wiederaufnahme des Lackiervorgangs auswirken könnte.Preferably, the dry compressed air, which can be supplied via a connection, can be made available to an application device via a connecting piece, bypassing the water bath contained in the container. This ensures that the lines, which lead during the painting humidified compressed air, especially saturated with moisture compressed air, can then be flushed with dry compressed air. In the lines then accumulates no or only negligible little condensation, which could have a negative impact on a resumption of the painting process.

Die Erfindung betrifft ferner eine Lackiereinrichtung für Wasserlack, die die vorstehend beschriebene Vorrichtung und die druckluftunterstützte Applikationseinrichtung für Wasserlack umfasst. Die Applikationseinrichtung ist zum druckluftunterstützten Zerstäuben des Wasserlacks an der Vorrichtung angeschlossen.The invention further relates to a painting device for water-based paint, which comprises the device described above and the air-assisted application device for water-based paint. The application device is connected to the device for compressed air-assisted atomization of the water-based paint.

Im Folgenden werden mögliche Ausführungsbeispiele der Erfindung mit Bezug auf Zeichnungen näher erläutert. Dabei zeigen:

Fig. 1
eine Vorrichtung zur Befeuchtung von Druckluft in einer Prinzipdarstellung.
In the following, possible embodiments of the invention will be explained in more detail with reference to drawings. Showing:
Fig. 1
a device for humidifying compressed air in a schematic diagram.

Einander entsprechende Teile sind in allen Figuren mit den gleichen Bezugszeichen versehen.Corresponding parts are provided in all figures with the same reference numerals.

Figur 1 zeigt eine Vorrichtung 1 zur Befeuchtung von Druckluft mit einem druckfesten Behältnis 2, welches ein Wasserbad enthält. Der Füllstand ist mittels Wasserstandsensoren 3, 4 erfassbar. Ferner ist die Temperatur des Wasserbads mittels eines Temperaturfühlers 5 messbar.
Wasser ist über einen Wasserzulauf 6 in das Behältnis 2 einbringbar. Innerhalb des Behältnisses 2 herrscht ein gegenüber Normalbedingungen erhöhter Innendruck vor, der beispielsweise einige bar beträgt. Der Wasserzulauf ist über ein Ventil 7, welches insbesondere als Magnetventil ausgestaltet ist, rückschlaggesichert. FIG. 1 shows a device 1 for humidifying compressed air with a pressure-resistant container 2, which contains a water bath. The level can be detected by means of water level sensors 3, 4. Furthermore, the temperature of the water bath can be measured by means of a temperature sensor 5.
Water can be introduced via a water inlet 6 into the container 2. Within the container 2 there is a relation to normal conditions increased internal pressure, which is for example a few bar. The water inlet is check-protected via a valve 7, which is designed in particular as a solenoid valve.

Im Bereich des Wasserzulaufs 6 ist ferner eine Heizeinrichtung 8 angeordnet, die dazu ausgebildet ist, das Wasserbad innerhalb des Behältnisses 2 auf eine vorgebbare Temperatur zu erwärmen.In the region of the water inlet 6, a heating device 8 is further arranged, which is adapted to heat the water bath within the container 2 to a predeterminable temperature.

Ein Lufteinlass 9 für Druckluft ist am Boden des druckfesten Behältnisses 2 angeordnet, so dass eingeblasene Druckluft durch das Wasserbad steigt und dabei Feuchtigkeit aufnimmt. Ein Luftauslass 10, über den die befeuchtete Druckluft das Behältnis 2 verlässt, ist an der Decke des Behältnisses 2 angeordnet.An air inlet 9 for compressed air is arranged at the bottom of the pressure-tight container 2, so that injected compressed air rises through the water bath and thereby absorbs moisture. An air outlet 10, via which the humidified compressed air leaves the container 2, is arranged on the ceiling of the container 2.

Dem Luftauslass 10 ist eine Tropfenabscheideeinheit 11 strömungstechnisch nachgeschaltet, die insbesondere dazu dient, kondensierte oder kondensierende Wasseranteile aus dem den Luftauslass 10 verlassenden Druckluftstrom abzuscheiden.The air outlet 10 downstream of a droplet separation unit 11, which serves in particular to separate condensed or condensing water components from the air outlet 10 leaving the compressed air flow.

Der Tropfenabscheideeinheit 11 ist weiterhin ein Verteilerstück 12 nachgeschaltet, welches über ein Verbindungsstück 13 mit einem weiteren Verteilerstück 15 verbunden ist. Das weitere Verteilerstück 15 weist einen Anschluss 16 zum Zuführen von trockener Druckluft auf. Der Strömungsquerschnitt des Verbindungsstücks 13 ist über eine Armatur 14 veränderbar. Die Armatur 14 ist in möglichen Ausführungsbeispielen als Absperrarmatur oder als Kugelhahn ausgeführt, so dass ein Fluss durch das Verbindungsstück 13 vollständig unterbrochen werden kann.The droplet separation unit 11 is further downstream of a distributor piece 12, which is connected via a connecting piece 13 with another distributor piece 15. The further distributor piece 15 has a connection 16 for supplying dry compressed air. The flow cross section of the connecting piece 13 can be changed via a fitting 14. The fitting 14 is executed in possible embodiments as a shut-off valve or as a ball valve, so that a flow through the connector 13 can be completely interrupted.

Am Anschluss 16 kann insbesondere ein Kompressor zum Zuführen von trockener Druckluft angeschlossen werden. Die Rohrverbindung zwischen dem weiteren Verteilerstück 15 und dem Lufteinlass 9 ist über eine weitere, insbesondere als Absperrhahn ausgeführte Armatur 17 absperrbar. Über einen Drosselregler 18 ist weiterhin die Größe des dem Lufteinlass 9 zugeführten Druckluftstroms veränderbar.In particular, a compressor for supplying dry compressed air can be connected to the connection 16. The pipe connection between the further distributor piece 15 and the air inlet 9 can be shut off via a further fitting 17, in particular designed as a stopcock. Via a throttle controller 18, the size of the air inlet 9 supplied compressed air flow is further variable.

Das Verteilerstück 14 ist weiterhin mit einem weiteren Anschluss 19 für eine druckluftunterstützte Applikationseinrichtung 100 fluidtechnisch verbunden. Zwischen dem Verteilerstück 12 und dem weiteren Anschluss 19 für die Applikationseinrichtung 100 ist eine Luftheizungseinheit 20 angeordnet, die dazu ausgebildet ist, den durchströmenden Druckluftstrom auf eine vorgegebene Temperatur zu erwärmen.The distributor 14 is further fluidly connected to a further connection 19 for a compressed air-assisted application device 100. Between the distributor piece 12 and the further connection 19 for the application device 100, an air heating unit 20 is arranged, which is designed to heat the flowing compressed air flow to a predetermined temperature.

Beim Betrieb der Applikationseinrichtung 100 wird diese mit befeuchteter Druckluft versorgt. Trockene Druckluft wird über den Anschluss 16 in die Vorrichtung 1 eingespeist. Hierzu ist die Armatur 14 im Verbindungsstück 13 zu schließen und die weitere Armatur 15 zu öffnen. Die über den Anschluss 16 zugeführte trockene Druckluft durchströmt das im druckfesten Behältnis 2 enthaltene Wasserbad, bevor diese an die Applikationseinrichtung 100 abgegeben wird. Beim Durchströmen des Wasserbads nimmt die Druckluft Feuchtigkeit auf. Das Wasserbad wird gegebenenfalls mittels der Heizeinrichtung 8 erwärmt, so dass die Druckluft beim Durchströmen des Wasserbads zudem erwärmt wird. Der Durchsatz im Behältnis 2 bzw. der Volumenstrom beträgt dabei vorzugsweise weniger als 1m3 pro Sekunde.During operation of the application device 100, it is supplied with humidified compressed air. Dry compressed air is fed via the port 16 in the device 1. For this purpose, the valve 14 is to close in the connector 13 and the other valve 15 to open. The supplied via the terminal 16 dry compressed air flows through the contained in the pressure-resistant container 2 water bath before it is delivered to the application device 100. As it flows through the water bath, the compressed air absorbs moisture. The water bath is optionally heated by means of the heating device 8, so that the compressed air is also heated when flowing through the water bath. The throughput in the container 2 or the volume flow is preferably less than 1m 3 per second.

Im Lackierbereich werden mittels einer Zuluftanlage kontrolliert gleichbleibende Umgebungsbedingungen geschaffen, die den Lackiervorgang begünstigen. Beispielsweise erfolgt der Lackiervorgang in einem möglichen Ausführungsbeispiel bei etwa 22° C und einer relativen Luftfeuchtigkeit von etwa 80%. Die Druckluft für die zum Auftragen des Wasserlacks vorgesehene Applikationseinrichtung 100 wird bevorzugt entsprechend der Umgebungsbedingungen aufbereitet und weist daher in dem exemplarisch genannten Fall ebenfalls eine Temperatur von etwa 22° C und eine relative Luftfeuchtigkeit von etwa 80% auf. Die Temperatur der zugeführten Druckluft wird über die Temperatur des Wasserbads sowie über die Luftheizungseinheit 20 vorgegeben. Die Luftheizungseinheit 20 ist insbesondere dazu vorgesehen, der Kondensation von Wassertropfen, welche bei Abkühlung der mit Feuchtigkeit gesättigten Druckluftstroms auftreten können, entgegenzuwirken.In Lackierbereich controlled ambient conditions are created by means of a supply air system, which favor the painting process. For example, the painting takes place in a possible embodiment at about 22 ° C and a relative humidity of about 80%. The compressed air for the intended application of the aqueous paint application device 100 is preferably processed according to the ambient conditions and therefore also has in the example mentioned case a temperature of about 22 ° C and a relative humidity of about 80%. The temperature of the supplied compressed air is predetermined via the temperature of the water bath and via the air heating unit 20. The air heating unit 20 is in particular intended to counteract the condensation of water droplets which may occur upon cooling of the moisture-saturated compressed air stream.

Nachdem ein Lackiervorgang beendet ist, wird die Armatur 14 im Verbindungsstück 13 geöffnet und die weitere Armatur 15 geschlossen. Die Fluidverbindung hin zur Applikationseinrichtung 100, insbesondere ein zwischen dem Anschluss 19 und der Applikationseinrichtung 100 angeordneter Schlauch, wird mit trockener Druckluft, die über den Anschluss 16 zugeführt wird, gespült, damit kein feuchte Luft in diesem Bereich verbleibt. Dadurch wird insbesondere erreicht, dass sich in diesem Bereich kein Kondenswasser bildet, welches das Lackierergebnis bei der Durchführung eines weiteren Lackiervorgangs negativ beeinflussen könnte.After a painting process is completed, the fitting 14 is opened in the connecting piece 13 and the other valve 15 is closed. The fluid connection to the application device 100, in particular a hose arranged between the connection 19 and the application device 100, is rinsed with dry compressed air, which is supplied via the connection 16, so that no moist air remains in this region. This ensures in particular that no condensation forms in this area, which could adversely affect the painting result when carrying out a further painting process.

Die Erfindung wurde vorstehend mit Bezug auf ein bevorzugtes Ausführungsbeispiel beschrieben. Es versteht sich jedoch, dass die Erfindung nicht auf die konkrete Ausgestaltung des gezeigten Ausführungsbeispiels beschränkt ist, vielmehr kann der zuständige Fachmann anhand der Beschreibung Variationen ableiten ohne von dem wesentlichen Grundgedanken der Erfindung abzuweichen.The invention has been described above with reference to a preferred embodiment. It is understood, however, that the invention is not limited to the specific embodiment of the embodiment shown, but rather the person skilled in the art can derive variations from the description without departing from the essential basic idea of the invention.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Vorrichtungcontraption
22
Behältniscontainer
33
WasserstandsensorWater level sensor
44
WasserstandsensorWater level sensor
55
Temperaturfühlertemperature sensor
66
Wasserzulaufwater supply
77
VentilValve
88th
Heizeinrichtungheater
99
Lufteinlassair intake
1010
Luftauslassair outlet
1111
TropfenabscheideeinheitTropfenabscheideeinheit
1212
Verteilerstückmanifold
1313
Verbindungsstückjoint
1414
Armaturfitting
1515
Verteilerstückmanifold
1616
Anschlussconnection
1717
Armaturfitting
1818
Drosselreglerthrottle controller
1919
Anschlussconnection
2020
LuftheizungseinheitAir heating unit
100100
Applikationseinrichtungapplication device

Claims (7)

Vorrichtung (1) zur Befeuchtung von Druckluft insbesondere für eine druckluftunterstützte Applikationseinrichtung (100) für Wasserlack, umfassend ein teilweise mit Wasser gefülltes, druckfestes Behältnis (2) mit einem Lufteinlass (9) und einem Luftauslass (10) für Druckluft, wobei der Lufteinlass (9) unterhalb eines Wasserspiegels eines im Behältnis (2) enthaltenen Wasserbads und der Luftauslass (10) oberhalb des Wasserspiegels des im Behältnis (2) enthaltenen Wasserbads angeordnet ist.Device (1) for humidifying compressed air, in particular for a compressed air-assisted application device (100) for water-based paint, comprising a partially filled with water, pressure-resistant container (2) with an air inlet (9) and an air outlet (10) for compressed air, wherein the air inlet ( 9) is arranged below a water level of a water bath contained in the container (2) and the air outlet (10) above the water level of the water bath contained in the container (2). Vorrichtung (1) nach Anspruch 1, wobei das im druckfesten Behältnis (2) enthaltene Wasserbad mittels einer Heizeinrichtung (8) aufheizbar ist.Device (1) according to claim 1, wherein the water bath contained in the pressure-resistant container (2) can be heated by means of a heating device (8). Vorrichtung (1) nach Anspruch 1 oder 2, wobei die Temperatur des im druckfesten Behältnis (2) enthaltenen Wassersbads mittels eines Temperaturfühlers (5) messbar ist.Device (1) according to claim 1 or 2, wherein the temperature of the water bath contained in the pressure-resistant container (2) by means of a temperature sensor (5) is measurable. Vorrichtung (1) nach einem der vorhergehenden Ansprüche, wobei dem Luftauslass (10) eine Tropfenabscheideeinheit (11) nachgeschaltet ist.Device (1) according to one of the preceding claims, wherein the air outlet (10) is followed by a Tropfenabscheideeinheit (11). Vorrichtung (1) nach einem der vorhergehenden Ansprüche, wobei dem Luftauslass (10) eine Luftheizungseinheit (20) nachgeschaltet ist.Device (1) according to one of the preceding claims, wherein the air outlet (10) an air heating unit (20) is connected downstream. Vorrichtung (1) nach einem der vorhergehenden Ansprüche, wobei über einen Anschluss (16) zuführbare Druckluft über ein Verbindungsstück (13) unter Umgehung des im Behältnis (2) enthaltenen Wasserbads an eine Applikationseinrichtung (100) bereitstellbar ist.Device (1) according to one of the preceding claims, wherein supplied via a connection (16) can be supplied via a connecting piece (13) bypassing the water bath contained in the container (2) to an application device (100). Lackiereinrichtung für Wasserlack, umfassend eine Vorrichtung (1) nach einem der vorhergehenden Ansprüche und eine druckluftunterstützte Applikationseinrichtung (100) für Wasserlack, welche zum druckluftunterstützten Zerstäuben des Wasserlacks an der Vorrichtung (1) angeschlossen ist.Varnishing device for water-based paint, comprising a device (1) according to one of the preceding claims and a compressed air-assisted Application device (100) for water-based paint, which is connected to the air-assisted atomization of the water-based paint on the device (1).
EP18155834.7A 2017-05-09 2018-02-08 Device for the humidification of compressed gas Active EP3401019B1 (en)

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Publication number Priority date Publication date Assignee Title
DE202020005425U1 (en) * 2019-11-21 2021-03-03 Thomas Mayer Painting gas supply system

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DE8434355U1 (en) * 1984-11-23 1985-02-21 Sata-Farbspritztechnik GmbH, 7140 Ludwigsburg DEVICE FOR CLEANING COMPRESSED AIR
DE3518041A1 (en) * 1985-05-20 1986-11-20 Helmut 7022 Leinfelden-Echterdingen Jüngling Controllable air humidifier for suction air or compressed air operation
EP0305748A2 (en) * 1987-09-04 1989-03-08 Ransburg-Gema AG Preparation installation for coating powder
DE60301390T2 (en) * 2002-02-07 2006-06-08 Commissariat à l'Energie Atomique METHOD AND DEVICE FOR BREATHING AIR PRODUCTION
AT504677B1 (en) * 2007-01-03 2010-05-15 Hauptkorn Herbert METHOD FOR PAINTING A SURFACE WITH A WATER VARNISH

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US3321191A (en) * 1966-02-11 1967-05-23 Herand K Najarian Gas and liquid contact apparatus
ITTO20010278A1 (en) * 2001-03-23 2002-09-23 Anest Iwata Europ Srl AUTOMATIC SPRAY GUN.
DE202007012990U1 (en) * 2007-09-17 2009-02-12 Carcoustics Techconsult Gmbh Air purification device for vehicles
AT13361U1 (en) * 2012-03-12 2013-11-15 Hauptkorn Herbert Apparatus for treating air for a room with a water paint coating plant

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Publication number Priority date Publication date Assignee Title
DE8434355U1 (en) * 1984-11-23 1985-02-21 Sata-Farbspritztechnik GmbH, 7140 Ludwigsburg DEVICE FOR CLEANING COMPRESSED AIR
DE3518041A1 (en) * 1985-05-20 1986-11-20 Helmut 7022 Leinfelden-Echterdingen Jüngling Controllable air humidifier for suction air or compressed air operation
EP0305748A2 (en) * 1987-09-04 1989-03-08 Ransburg-Gema AG Preparation installation for coating powder
DE60301390T2 (en) * 2002-02-07 2006-06-08 Commissariat à l'Energie Atomique METHOD AND DEVICE FOR BREATHING AIR PRODUCTION
AT504677B1 (en) * 2007-01-03 2010-05-15 Hauptkorn Herbert METHOD FOR PAINTING A SURFACE WITH A WATER VARNISH

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